JP5285286B2 - Ride type rice transplanter - Google Patents

Description

  The present invention relates to a riding type rice transplanter provided with an operating tool that can be moved to a storage position stored in a front portion of a machine body and a work position that moves forward from the storage position and can be operated from the ground.

As a conventional technique, as disclosed in Patent Document 1, for example, an arm body that is rotatable between a use position that protrudes forward and a non-use position that rises upward (see FIG. 1 of FIG. 1 of Patent Document 1) and a differential mechanism (51 of FIG. 4 of Patent Document 1) provided in the traveling portion, and interlocked with the rotation operation of the arm body from the non-use position to the use position. A riding-type rice transplanter configured so that a differential mechanism operates as a differential lock is known.
JP 2004-121125 A (refer to FIGS. 1, 4 and 6)

  In the riding type rice transplanter disclosed in Patent Document 1, the arm body rotates an operating shaft (53 in FIG. 4 of Patent Document 1) of a differential lock mechanism (52 in FIG. 4 of Patent Document 1). It is linked to 58) of FIG. 4 via an arm linkage wire (90 of FIG. 6 of Patent Document 1). Therefore, when the arm body is rotated from the non-use position to the use position side, the arm link wire is pulled regardless of the operation position of the arm body, and the rotation movement of the arm body is transmitted to the operation shaft of the differential lock mechanism. The That is, the diff mechanism is configured to perform a diff-lock operation in substantially the entire region other than the non-use position in the rotation range of the arm body.

  When the diff mechanism operates in a diff-locking operation in substantially the entire region other than the non-use position of the rotation range of the arm body as in the riding type rice transplanter of Patent Document 1, for example, after the end of the heel overwork using the arm body, When the seedlings are planted with the arm body tilted forward from the non-use position without properly retracting the arm body due to carelessness, etc., or when the operator intentionally moves the arm body forward from the non-use position. When the seedling planting work is performed in the tilted state, the diff mechanism operates the diff lock regardless of the operator's intention, even though the operator does not try to perform the diff lock operation. There was a possibility that the workability of the would worsen.

  The present invention prevents the front wheel differential mechanism from operating diff-lock regardless of the operator's intention even though the operator does not attempt to perform the differential lock operation on the front wheel differential mechanism, thereby improving the workability of seedling planting work. The purpose is to realize a riding rice transplanter that can be used.

[I]
(Constitution)
The first feature of the present invention is that the riding type rice transplanter is configured as follows.

An operating tool that can be moved to a storage position stored at the front of the aircraft and a work position that moves forward from the storage position and can be operated from the ground is provided on the front side of the mission case, and the storage position and the work position An intermediate position is set between the operating tool and the front wheel differential mechanism so that the front wheel differential mechanism is operated in the differential lock state between the intermediate position and the working position. The diff lock operating tool is connected to the control rod located on the side and provided with a diff lock operating tool different from the operating tool on the floor of the operation unit, and the front wheel diff mechanism is operated in the diff locked state by the diff lock operating tool. And a blocking means for preventing the operation of the differential lock operation tool from being transmitted to the operation tool side and preventing the operation of the operation tool from being transmitted to the differential lock operation tool side. That.
(Function)
According to the first feature of the present invention, it is possible to maintain the state where the front wheel differential mechanism is operated in the differential operation state in a state where the position of the operation tool is changed between the storage position and the intermediate position. Thus, for example, the seedling planting work was performed in a state in which the operation tool was repositioned forward from the storage position without properly storing the operation tool due to the carelessness of the operator after completion of the crossing work using the operation tool. In the case where the operator has intentionally changed the position of the operation tool forward from the storage position, the operator does not attempt to perform the diff lock operation on the front wheel diff mechanism. Regardless of the operator's intention, the front wheel differential mechanism can be prevented from performing differential lock operation.

  For example, if the front wheel differential mechanism is to be diff-locked by a meshing mechanism, if there is a position where the meshing mechanism meshes near the position where the operation tool is operated relatively frequently, the halfway meshing state Appears, and there is a possibility that a meshing failure of the meshing mechanism occurs.

According to the first feature of the present invention, the diff lock of the front-wheel diff mechanism is located at a position (intermediate position) away from a position (work position and storage position) where the operation tool is operated relatively frequently in the culling work and seedling planting work. The switching position for operation can be located. As a result, for example, when the front wheel differential mechanism is to be diff-locked by the meshing mechanism, a halfway meshing state becomes difficult to appear, and the meshing failure of the meshing mechanism can be prevented.
(Effect of the invention)
According to the first feature of the present invention, the front wheel diff mechanism can be differential-locked by the operating tool, so that the operability of the operating tool during the crossing operation is improved and the front wheel diff mechanism is preferably diff-locked. Can improve the workability of seedling planting work .

According to the first feature of the present invention, the differential lock operation tool can switch between the differential lock state and the differential operation state of the front wheel differential mechanism on the floor of the driving unit. This prevents the front wheel differential mechanism from performing the differential lock operation regardless of the operator's intention even though the differential lock operation tool has been switched to the differential operation state. The state of the front wheel differential mechanism can be switched separately from each other by the operation tool .

According to the 1st characteristic of this invention, seedling planting work can be performed without trouble and the workability | operativity of seedling planting work can be improved .

According to the first feature of the present invention, even if the differential lock operation tool is operated, the blocking means prevents the operation of the differential lock operation tool from being transmitted to the operation tool side, and the operation is performed by operating the differential lock operation tool in the operating unit. It is possible to prevent the position of the tool from being changed. Thus, the position of the operating tool during the seedling planting work is changed, it is possible to prevent the operating member is in the way of such traveling and working.

According to the 1st characteristic of this invention, the workability | operativity of seedling planting work can further be improved.
[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the riding type rice transplanter of the first feature of the present invention.
The operation shaft of the front wheel differential mechanism is fixed to an arm member that is linked to the linkage rod of the operation tool and the linkage rod that is linked to the differential lock operation tool. A first elongated hole to which the linkage rod is linked and a second elongated hole to which the linkage rod of the differential lock operating tool is linked are formed, and the blocking means is configured such that the operation of the differential lock operating tool is directed to the operating tool side. The transmission is blocked by the first long hole, and the operation of the operation tool is blocked by the second long hole from being transmitted to the differential lock operation tool side.
[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the riding rice transplanter of the first or second feature of the present invention.

The operation tool includes an aiming member that serves as an aim during planting.
(Function)
According to a third aspect of the present invention comprises a "working" as described as in the first or second feature of the present invention set forth in the preceding paragraph [I] ~ [II], the following in addition to " It has an “action”.

According to the third feature of the present invention, when the operating tool is repositioned forward from the retracted position, the aiming member provided in the operating tool will be located at a position that is far from the operator of the operating unit, and the aiming member It is easier to aim at the time of planting. In this case, even if the position of the operation tool is changed from the storage position to the front, the front wheel differential mechanism remains in the differential operation state when the operation tool is repositioned between the storage position and the intermediate position. Therefore, the front wheel differential mechanism does not perform differential lock operation by changing the position of the operation tool from the retracted position to the front.
(Effect of the invention)
According to a third aspect of the present invention comprises a "effect of invention" according to the same manner as the first or second feature of the present invention set forth in the preceding paragraph [I] ~ [II], the following in addition to The “effect of the invention” is provided.

According to the third feature of the present invention, the seedling planting work can be performed with high accuracy by the aiming member, and the workability of the seedling planting work can be further improved.
[ IV ]
(Constitution)
The fourth feature of the present invention resides in the following configuration in the riding type rice transplanter of the first to third features of the present invention.

The operation tool is provided with a machine body stop switch for stopping the machine body.
(Function)
According to the 4th characteristic of this invention, it is equipped with the "action" of previous clause [I]-[ III ] similarly to any one of the 1st- 3rd characteristic of this invention, and in addition to this, the following It has such “action”.

According to the fourth feature of the present invention, by operating the airframe stop switch, the airframe can be stopped while operating the operation tool from the ground. Thereby, the operativity of an operation tool can further be improved.
(Effect of the invention)
According to the fourth aspect of the present invention, as in any one of the first to third aspects of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [ III ] is provided. The following “effects of the invention” are provided.

According to the 4th characteristic of this invention, the workability | operativity of the crossing work using a control tool can further be improved.
[ V ]
(Constitution)
The fifth feature of the present invention resides in the following configuration in the riding type rice transplanter of the first to fourth features of the present invention.

By pressing toward the operating member downward in said working position from the ground, are operably configured pushed down the front of the body through the operating member.
(Function)
According to the 5th characteristic of this invention, it is equipped with the "action" as described in previous clause [I]-[IV] similarly to any one of the 1st-4th characteristic of this invention. It has such “action”.

According to the fifth feature of the present invention, by pressing the operating tool downward, the body can be stabilized while preventing the front portion of the body from being lifted, and the crossing work can be performed.
(Effect of the invention)
According to the fifth aspect of the present invention, as in any one of the first to fourth aspects of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [ IV ] is provided. The following “effects of the invention” are provided.

According to the fifth aspect of the present invention, the workability of the crossing work using the operation tool can be further improved.
[ VI ]
(Constitution)
The sixth feature of the present invention resides in the following configuration in the riding type rice transplanter of the first to fifth features of the present invention.
In a part of the range between the storage position and the working position, the brake device is operated to the braking side or the main clutch is operated to the disengagement side.
[ VII ]
(Constitution)
The seventh feature of the present invention resides in the following configuration in the riding rice transplanter of the first to sixth features of the present invention.
The operating tool is a steering handle for steering the front wheel to the right and left.
[ VIII ]
(Constitution)
The eighth feature of the present invention resides in the following configuration in the riding rice transplanter of the first to sixth features of the present invention.
The operation tool is configured to be freely slidable in the front-rear direction, the operation tool is slid backward, the position of the operation tool is changed to the storage position, and the operation tool is slid forward. The operation tool is configured to be repositioned to the work position.
[ IX ]
(Constitution)
A ninth feature of the present invention resides in the following configuration in the riding rice transplanter of the eighth feature of the present invention.
A position in which the operation tool is slid forward by a predetermined length from the storage position is set as the intermediate position.

[Overall configuration of riding rice transplanter]
The overall configuration of the riding rice transplanter will be described with reference to FIGS. FIG. 1 is an overall side view of the riding type rice transplanter, FIG. 2 is an overall plan view of the riding type rice transplanter, and FIG. 3 is an overall front view of the riding type rice transplanter.

  As shown in FIGS. 1 to 3, a driving unit 4 including a driving seat 3 is arranged on a body supported by a front wheel 1 and a rear wheel 2 that can be steered right and left. A four-row planting seedling planting device 6 is connected to the rear part of the machine body through a parallel quadruple link mechanism 5 so as to be movable up and down, and a hydraulic cylinder 7 that drives the link mechanism 5 to move up and down is provided. Type rice transplanter is configured.

  The seedling planting device 6 is supported by a seedling bed 8 that is driven by reciprocating lateral feed with a predetermined stroke, a planting transmission case 9, a rotating case 10 that is rotationally driven at the rear of the planting transmission case 9, and a rotating case 10. A pair of planting claws 11, a plurality of floats 12, and the like are provided, and the planting claws 11 alternately take out seedlings from the lower part of the seedling table 8 and plant them on the rice field by the rotation of the rotating case 10. It is configured.

  A floor 13 is formed on the front side of the driver seat 3, the right side and the left side of the driver seat 3, and the engine E is disposed on the front portion of the floor 13. An openable front bonnet 14 covering the engine E, a rear bonnet 15 disposed at the rear of the engine E, and an upper panel 16 disposed at the top of the engine E are provided, and the front wheel 1 is operated to the right and left. A steering handle H that is operated in a direction is disposed on the upper panel 16.

Step portions 17 are arranged on the right and left sides of the front and rear bonnets 14, 15, and the right and left step portions 17 are connected to the floor 13. A plurality of reserve seedling platforms 18 are disposed on the right and left sides of the right and left step portions 17.
[Transmission structure of riding rice transplanter]
The transmission structure of the riding type rice transplanter will be described with reference to FIGS. 4 is a side view of the front part of the riding type rice transplanter, FIG. 5 is a schematic plan view for explaining the linkage structure of the brake pedal 27, and FIG. 6 is a cross-sectional view of the transmission case 20.

  As shown in FIGS. 1 and 4, a mission case 20 is disposed below the rear side of the rear bonnet 15, and a front axle case 21 is extended from the mission case 20 to the left and right, so that the right and left front axle cases are The right and left front wheels 1 are supported at the end of 21 so as to be steerable. The right and left swing cases 22 are supported on both the left and right sides of the rear portion of the transmission case 20 so as to be swingable up and down around the left and right axis, and the rear axle case is provided at the rear end of the swing case 22. The right and left rear wheels 2 are supported at the ends of the right and left rear axle cases 23.

A hydrostatic continuously variable transmission 24 that is steplessly variable forward and backward is connected to the left side of the upper part of the transmission case 20, and the power of the engine E is hydrostatically driven via a belt transmission mechanism 25. It is transmitted to the continuously variable transmission 24. The belt transmission mechanism 25, a main clutch 26 of the belt tension-type is equipped, by the main clutch 2 6, can block the transmission of power to the hydrostatic continuously variable transmission 24 from the engine E.

  A brake device 19 is arranged inside the mission case 20, and the brake device 19 can brake the left and right front wheels 1 and the left and right rear wheels 2 (power from the hydrostatic continuously variable transmission 24). Is transmitted to the left and right front wheels 1 and transmitted to the left and right rear wheels 2, so that when the brake device 19 brakes the right and left rear wheels 2, the right and left front wheels 1 Is also braked).

  As shown in FIGS. 2 and 3, a brake pedal 27 is disposed on the right side of the floor 13 (the right side of the rear bonnet 15). On the brake pedal 27, an operation lever 28 for getting off the vehicle that can be artificially operated from the front of the aircraft is extended to the front side of the aircraft.

  As shown in FIG. 5, an engagement member 28 a having a U-shape in plan view is fixed to the operation lever 28 for getting off along the front-rear direction, and the step portion 17 located on the lateral side of the operation lever 28 for getting off. Is equipped with a lock lever 29 that can be swung left and right. Thus, the lock lever 29 is engaged with the engagement member 28a of the getting-off operation lever 28 while the brake pedal 27 is stepped on, so that the getting-off operation lever 28 is swung forward (the brake pedal 27). Can be held with stepping on).

  An elastic spring 27a is provided on the left side of the brake pedal 27, and the brake pedal 27 is biased upward by the elastic spring 27a. An arm 27 b is fixed to the left end portion of the brake pedal 27, and this arm 27 b is connected to a tension arm 26 a of the main clutch 26 supported so as to be swingable around the left and right axis centers via a linkage rod 38. It is linked. Accordingly, when the brake pedal 27 is depressed, the main clutch 26 mechanically linked to the brake pedal 27 is operated to the transmission cut-off side.

  An operation shaft 19a for operating the brake device 19 is extended upward from a brake device 19 disposed in the transmission case 20, and the operation arm 19b swings around the vertical axis about the operation shaft 19a. It is fixed freely. An arm 27c is fixed to the left and right center portion of the brake pedal 27, and an operation arm 19b is linked to the arm 27c via a linkage rod 39 and the like. Thus, when the brake pedal 27 is depressed, the brake device 19 mechanically linked to the brake pedal 27 is operated to the braking side.

  As shown in FIG. 6, a first transmission shaft 30 is rotatably supported by the transmission case 20, and an output shaft 24 a of a hydrostatic continuously variable transmission 24 is attached to the first transmission shaft 30. The spline structure is externally fitted so as to be integrally rotatable. A second transmission shaft 31 is rotatably supported on the transmission case 20, and a high speed gear 31a and a low speed gear 31b are fixed to the second transmission shaft 31 so as to be integrally rotatable.

  A transmission gear 30 a is integrally formed with the first transmission shaft 30, and this transmission gear 30 a is engaged with a high-speed gear 31 a that is externally fitted to the second transmission shaft 31, so that power from the first transmission shaft 30 is received. It is configured to be transmitted to the second transmission shaft 31.

  The right and left axles 32 are supported across the mission case 20 and the left and right front axle cases 21. A cylindrical shaft 33 is rotatably fitted to the right axle 32, and a shift gear 34 having a large-diameter gear and a small-diameter gear is rotatably attached to the cylindrical shaft 33 by a spline structure and is slidable. Is externally fitted. Accordingly, the shift gear 34 is supported so as to be slidable at a planting travel position (low speed) to be engaged with the low speed gear 31b, a road travel position (high speed) to be engaged with the high speed gear 31a, and a neutral position.

  The shift gear 34 is mechanically linked to an auxiliary transmission lever 35 provided on the left side of the driver's seat 3 (see FIGS. 1 and 2). The auxiliary transmission lever 35 moves the shift gear 34 to a planting travel position (see FIG. 1). It is configured to be able to slide to a low speed), a road running position (high speed) and a neutral position.

  A drive procket 36 is externally fitted to the cylindrical shaft 33 so as to be integrally rotatable with a spline structure, and power from the drive sprocket 36 is transmitted to the rear axle case 22 via a transmission chain 37. The power transmitted to the rear axle case 22 is configured to be transmitted to the right and left rear wheels 2 via a bevel gear mechanism (not shown) (no rear wheel differential mechanism is provided), A wet multi-plate side clutch (not shown) is provided between the bevel gear mechanism and the right rear wheel 2 and between the bevel gear mechanism and the left rear wheel 2.

  The front wheel differential mechanism 40 includes a case 40a linked to the drive sprocket 36, a plurality of bevel gears 40b supported by the case 40a so as to freely rotate, and a pair of bevel gears 40c engaged with the plurality of bevel gears 40b. Configured.

  The right and left axles 32 that transmit power to the right and left front wheels 1 are inserted into the case 40a, and the right and left axles 32 are fitted into the bevel gear 40c so as to be integrally rotatable by a spline structure. As a result, the power from the second transmission shaft 31 is transmitted to the right and left front wheels 1 via the shift gear 34, the cylinder shaft 33, and the front wheel differential mechanism 40.

  An operating member 41 is externally fitted to the left axle 32 so as to be rotatable integrally with the key structure and slidable. The operating member 41 is placed on the left side of FIG. 6 across the operating member 41 and the case 40a. An elastic spring 42 for biasing is attached. As a result, when the operating member 41 is slid rightward on the paper surface of FIG. 6 and engaged with the case 40a against the urging force of the elastic spring 42, the case 40a is fixed to the left axle 42. The front wheel differential mechanism 40 enters the differential lock state. On the other hand, when the operating member 41 is slid to the left in FIG. 6 by the urging force of the elastic spring 42 to move away from the case 40a, the front wheel differential mechanism 40 enters the differential operation state (diff lock release state).

  The operation member 41 is formed with an uneven portion that meshes with the uneven portion of the case 40a, and the uneven portion of the operation member 41 engages with the uneven portion of the case 40a so that the case 40a is engaged with the left axle 42. In the fixed state, the front wheel differential mechanism 40 enters the differential lock state.

  An operating shaft 43 is rotatably supported by a boss formed on the mission case 20. At the end of the operation shaft 43 located inside the mission case 20, a pin 43 a having a circular cross section eccentric from the rotation axis of the operation shaft 43 is provided, and the pin 43 a is engaged with the operation member 41.

  Thus, normally, the operating member 41 is slid to the left in FIG. 6 by the biasing force of the elastic spring 42, the operating member 41 is separated from the case 40a, and the front wheel differential mechanism 40 is in the differential operation state. On the other hand, when the operation shaft 43 is rotated and the operation member 41 is slid to the right in FIG. 6, the operation member 41 is engaged with the case 40a, and the front wheel differential mechanism 40 is in the differential lock state.

  A concentric transmission shaft 46 is rotatably fitted on the first transmission shaft 30, and the inter-shaft transmission 47 capable of shifting in three stages across the transmission shaft 46 and the second transmission shaft 31. Is provided. As a result, the power transmitted from the first transmission shaft 30 to the second transmission shaft 31 via the transmission gear 30 a and the high speed gear 31 a is shifted by the stock transmission 47 and transmitted to the transmission shaft 46.

A third transmission shaft 48 is rotatably supported on the transmission case 20, and a pair of inter-gear gears 49 are mounted across the third transmission shaft 48 and the transmission shaft 46. The third transmission shaft 48 is connected to a front-rear PTO shaft 52 via a bevel gear transmission mechanism 50 and a planting clutch 51, and the power from the transmission shaft 46 is transmitted between the stock gear 49 and the third transmission shaft 48. , And transmitted to the PTO shaft 52 via the bevel transmission mechanism 50 and the planting clutch 51.
[Detailed structure of operation arm]
A detailed structure of an operation arm 60 (corresponding to an operation tool) that can be artificially operated from the front of the body will be described with reference to FIGS. 1, 2, 4, and 7 to 11. FIG. FIG. 7 is a vertical side view for explaining the linkage structure of the operation arm 60, and FIG. 8 is a transverse plan view for explaining the linkage structure of the operation arm 60. FIG. 9 is a detailed side view of the vicinity of the base end portion of the operation arm 60 in the retracted position, and FIG. 10 is a detailed side view of the vicinity of the base end portion of the operation arm 60 in the working position. FIG. 11 is a plan view of the vicinity of the arm member 70.

  As shown in FIG. 4, an engine frame 54 extends forward from the front portion of the mission case 20 and is fixed. The engine frame 54 is provided on a main frame 55 having a hat-like longitudinal cross-sectional shape when viewed from the front and back, a front frame 56 fixed to the front end of the main frame 55, and an upper rear portion of the main frame 55. The rear frame 57 is formed by welding, and the engine E is supported on the front frame 56 and the rear frame 57 via an engine mount.

  The operation arm 60 includes a grip part 60A that is long to the left and right and an arm part 60B that is vertically long at the storage position A. The operation arm 60 is integrally formed of a round pipe material, and stands at the front part of the fuselage. It is configured to be changeable between a storage position A stored on the machine body side and a work position D swinging forward from the storage position A and lying down, and gripping the grip part 60A with one hand or both hands from the front of the machine It is comprised so that a machine can be operated (refer FIG.12 and FIG.13).

  A center mascot 60a (corresponding to an aiming member) is attached to the left and right central portions of the grip portion 60A of the operation arm 60 so as to be rotatable with respect to the grip portion 60A and fixed at an arbitrary rotation position.

  As shown in FIGS. 7 to 10, a vertical bracket-like left bracket 60 a is fixed to the left lower end portion of the operation arm 60, and the left bracket 60 a is connected to the main frame 55 by the left support shaft 61. Is supported so as to be rotatable around a horizontal axis P1. A U-shaped right bracket 60 a having a cross-sectional shape opened rearward in a plan view is fixed to a lower end portion on the right side of the operation arm 60, and the right bracket 60 a is connected to the main shaft 61 by the right support shaft 61. A front portion of the frame 55 is supported so as to be rotatable around a horizontal axis P1. As a result, the operation arm 60 is supported on the front portion of the engine frame 54 so as to be swingable up and down around the left and right axis P1.

  A contact portion 56a is formed below the front frame 56 that supports the engine E, and a reinforcing member 56b is fixed to the upper surface side of the front frame 56 at the position of the contact portion 56a. As a result, when the operation arm 60 is swung upward about the left and right axis P <b> 1, the upper sides of the left and right brackets 60 a come into contact with the contact portion 56 a of the front frame 56, and the operation arm 60 is moved upward. The rocking range is regulated. Even if a bending moment around the left and right axis P1 acts on the front frame 56, the reinforcing member 56b prevents the front frame 56 from being deformed.

  At the front lower part of the main frame 55, a right and left long restricting member 55a is fixed by bending both ends of the round bar backward. When the operating arm 60 is swung downward, the lower sides of the left and right brackets 60a come into contact with the restricting member 55a, and the swinging range of the operating arm 60 is restricted. Can be pushed downward.

  Since the lower end of the restricting member 55a is set at a position lower than the lower ends of the left and right main frames 55, the restricting member 55a first comes into contact with the eaves or the like when the riding rice transplanter is brought closer to the eaves or the like. become. Thereby, the regulation member 55a can be used also as a guard member of the front lower part of a riding type rice transplanter.

The left and right brackets 60a are attached to the side plate of the main frame 55 via a disc spring (not shown) as a swinging posture holding mechanism, and at any position where the operating arm 60 is swung by the disc spring. It is configured so that it can be held. Although not shown, the operation arm 60 may be configured to be fixed at a plurality of or arbitrary positions where the operation arm 60 is swung.

A hook 60b is fixed to the lower rear portion of the left bracket 60a, and one end (front end) of the first linkage rod 62 is linked to the hook 60b. An intermediate support shaft 63 is fixed to the upper portion of the main frame 55 at the front and rear central portion, and an intermediate arm 64 is supported by the intermediate support shaft 63 so as to be rotatable around a left-right axis P2.

  A long hole portion 64A that is long in the front-rear direction is formed in the upper and lower central portion of the intermediate arm 64, and a support shaft 62a fixed to the other end portion of the first linkage rod 62 is linked to the long hole portion 64A. ing. A left and right through hole is formed at the lower end of the intermediate arm 64, and one end (front end) of the second linkage rod 65 is linked to the through hole.

  The distance between the fulcrums from the left-right axis P2 to one end of the second linkage rod 65 is set longer than the distance between the fulcrums from the left-right axis P2 to the spindle 62a of the first linkage rod 62. The movement of the first linkage rod 62 in the front-rear direction (swinging of the bracket 60a around the axis P1 in the lateral direction) can be amplified by the intermediate arm 64 and transmitted to the second linkage rod 65.

  Further, since the horizontal axis P2 is set to a position higher than the horizontal axis P1, and the lower end of the intermediate arm 64 is set to a position higher than the lower surface of the main frame 55, the first linkage rod 62 and the intermediate axis The arm 64 can be disposed above the lower surface of the main frame 55. Thereby, when the front part of a riding type rice transplanter is brought close to a ridge etc., it can prevent that the 1st linkage rod 62, the intermediate | middle arm 64, etc. contact a heel etc., and are damaged.

  The operation shaft 43 of the front wheel differential mechanism 40 is supported so as to be rotatable around a vertical axis P <b> 3 from the left side of the mission case 20. An arm member 70 is fixed to the lower end portion of the operation shaft 43 (see FIG. 6).

  The bracket 66 is formed in a U shape whose longitudinal section is opened downward. A horizontal through hole is formed in the lower portion of the bracket 66, and the other end portion (rear end portion) of the second linkage rod 65 is fitted into the through hole, so that the bracket 66 is attached to the second linkage rod 65. On the other hand, it is slidably mounted back and forth.

  A stopper member 65 a is fixed to the other end portion (rear end portion) of the second linkage rod 65, and an elastic spring 67 is fitted over the stopper member 65 a and the bracket 66. The elastic spring 67 is composed of a compression spring, and is mounted between the stopper member 65a and the bracket 66 in a state where it is slightly compressed from its free length.

  A vertical through-hole is formed in the upper portion of the bracket 66, and the second linkage rod 65 is mounted by attaching a pin 68 across the through-hole and a first long hole 70 </ b> A of an arm member 70 described later. The other end portion (rear end portion) is linked to the arm member 70 via the bracket 66 and the pin 68.

  As shown in FIG. 11, a first elongate hole 70 </ b> A (corresponding to a blocking means) in the circumferential direction centering on the vertical axis P <b> 3 is formed in the front portion of the arm member 70. In the rear portion, a second long hole 70B in the circumferential direction centering on the vertical axis P3 is formed. The first elongated hole 70A is linked to the other end (rear end) of the second linkage rod 65 via a bracket 66 and a pin 68, and the second elongated hole 70B is one end of the third linkage rod 71. It is linked to (front end).

  As shown in FIGS. 7 and 8, a rear support shaft 72 is fixed to the rear portion of the side of the mission case 20, and the rear arm 73 rotates around a left-right axis P <b> 4 of the rear support shaft 72. It is supported freely. A left and right through hole is formed in the lower portion of the rear arm 73, and the other end (rear end) of the third linkage rod 71 is linked to the left and right through hole.

  As shown in FIGS. 1 and 2, a diff lock pedal 44 (corresponding to a diff lock operation tool) is arranged on the floor 13 of the driving unit 4 on the lower left side of the driver's seat 3, and the diff lock pedal 44 is used as a mission. It is mechanically linked to the portion of the operating shaft 43 that protrudes from the case 20. The differential lock pedal 44 may be disposed in the step unit 17 of the operation unit 4.

  As shown in FIGS. 7 and 8, the differential lock pedal 44 includes a stepping portion 44a and a rod member 44b. A left and right through hole is formed in the upper rear part of the rear arm 73, and the lower end of the rod member 44b of the differential lock pedal 44 is linked to the left and right through hole. An elastic spring 74 is provided across the rear arm 73 and the transmission case 20, and the differential lock pedal 44 is biased upward by the elastic spring 74.

  When the operation arm 60 is swung downward, the left and right brackets 60a are swung counterclockwise around the axis P1 in the left-right direction, and the first linkage rod 62 is pushed backward. In this case, the intermediate arm 64 does not swing in the range W of the long hole portion 64A formed in the intermediate arm 64 (the range in which the support shaft 62a moves through the long hole portion 64A). When the first linkage rod 62 is pushed rearward beyond the range of the long hole portion 64A formed in the intermediate arm 64, the intermediate arm 64 rotates counterclockwise on the paper surface of FIG. And the second linkage rod 65 is pushed backward.

  In this case, when the first linkage rod 62 is pushed rearward beyond the range W of the long hole portion 64A formed in the intermediate arm 64, the load for operating the device on the rear side of the intermediate arm 64 is changed to the first linkage. It acts on the operation arm 60 via the rod 62. Thereby, in the range W in which the long hole portion 64A is formed, the operating force for operating the operation arm 60 can be reduced, and in the range exceeding the range W in which the long hole portion 64A is formed, the operation arm 60 can be moved. The operating force to operate can be increased. As a result, it is possible to determine that the front wheel differential mechanism 40 is operated in the differential lock state by the operation force downward of the operation arm 60, and while operating the operation arm 60 from the front of the machine body, 40 differential lock states and differential operation states can be easily grasped.

  When the second linkage rod 65 is pushed backward, the elastic spring 67 is slightly compressed by the stopper portion 65a of the second linkage rod 65, and then the bracket 66 is pushed backward. When the bracket 66 is pushed rearward, the arm member 70 swings counterclockwise in FIG. Then, the operating member 41 is engaged with the case 40a, the case 40a is fixed to the left axle 42, and the front wheel differential mechanism 40 is in the differential lock state.

  When the operating member 41 is engaged with the case 40a, the uneven portion of the operating member 41 is difficult to engage with the uneven portion of the case 40a (the protruding portion of the operating member 41 is in contact with the protruding portion of the case 40a and does not mesh well). In this case, the compression of the elastic spring 67 allows the arm member 70 to swing clockwise in FIG. 8, and allows the operation member 41 to escape to the left in FIG. In this way, the engagement failure prevention mechanism for preventing the engagement failure of the operation member 41 is configured by the elastic spring 67 and the like.

  As a result, when the operation arm 60 is pushed down, for example, a relatively large bending moment with the left and right axis P1 as a fulcrum acts on the operation arm 60 having a relatively long moment arm, and the operation arm 60 is engaged. Even if the escape cannot be ensured, the operation member 41 is easily engaged with the case 40a by the engagement failure prevention mechanism, the front wheel differential mechanism 40 can be switched to the differential lock state without difficulty, and the operation arm 60 and the arm member 70 It is possible to prevent vibration or the like due to a meshing failure of the operation member 41 from being transmitted to the operation arm 60 while preventing and protecting the overload of the link path between the operation member 41 and the operation arm 60.

  Further, when the bracket 66 is pushed via the elastic spring 67, for example, when the operation arm 60 is repeatedly operated, deformation or wear occurs, and the length of the second linkage rod 65 is changed. Even so, this change in length or the like can be permitted by the expansion and contraction of the elastic spring 67. Thereby, the front-wheel differential mechanism 40 can be reliably operated in the differential lock state.

  As shown in FIG. 11, when the arm member 70 is swung counterclockwise in FIG. 11 by operating the operation arm 60 from the state where the arm member 70 is not swung (FIG. 11a), FIG. When the operating member 41 moves in the range of X and the arm member 70 swings beyond the range of X in FIG. 11 to the range of Y in FIG. 11, the operating member 41 is engaged with the case 40b. In this case, one end portion (front end portion) of the third linkage rod 71 is linked to the second elongated hole 70 </ b> B. Therefore, when the arm member 70 swings, the second elongated hole 70 </ b> B becomes one end of the third linkage rod 71. Move along the part.

  Thereby, even if the arm member 70 is swung by swinging the operation arm 60, the operation of the operation arm 60 is not transmitted to the third linkage rod 71 side. Thus, the differential lock pedal 44 can be prevented from operating. Therefore, blocking means for blocking the movement of the operation arm 60 from the second elongated hole 70B of the arm member 70 to the differential lock pedal 44 side is configured.

  As shown in FIGS. 7 and 8, when the operating arm 60 is swung upward, the left and right brackets 60a are swung clockwise around the axis P1 in the left-right direction in FIG. 7, and the first linkage rod 62 is moved. Pulled forward. Then, the operating member 41 is slid by the urging force of the elastic spring 42, the operating member 41 is separated from the case 40a, and the front wheel differential mechanism 40 enters the differential operating state. Along with this, the arm member 70 swings clockwise in FIG. 8, and the second linkage rod 65 is pushed forward via the pin 68 and the bracket 66.

  When the second linkage rod 65 is pushed forward, the intermediate arm 64 swings clockwise around the axis P2 in the left-right direction in FIG. In the range W where the elongated hole portion 64A is formed, the other end portion of the first linkage rod 65 moves forward along the elongated hole portion 64A due to the upward swing of the operation arm 60.

  When the step 44a of the differential lock pedal 44 is depressed downward, the rear arm 73 swings around the axis P4 in the left-right direction via the rod member 44b in the clockwise direction in FIG. Is pushed forward. Then, the arm member 70 swings counterclockwise around the axis P3 in the vertical direction in FIG. 8, the operating member 41 is engaged with the case 40a, and the case 40a is fixed to the left axle 42. Thus, the front wheel differential mechanism 40 enters the differential lock state.

  As shown in FIG. 11, when the arm member 70 is swung counterclockwise in FIG. 11 from the state where the arm member 70 is not swung (b in FIG. 11) by the depression operation of the differential lock pedal 44, When the operation member 41 slides and moves within the range of X in FIG. 11 and the arm member 70 swings beyond the range of X in FIG. 11 to the range of Y in FIG. 11, the operation member 41 is engaged with the case 40b. In this case, since the pin 68 on the second linkage rod 65 side is linked to the first long hole 70 </ b> A, when the arm member 70 swings, the first long hole 70 </ b> A moves along the pin 68.

Thus, even when the arm member 70 is swung by operating depresses the differential lock pedal 44, since the operation of the differential lock pedal 44 is not transmitted to the second linking rod 65 side, in conjunction with the depression of the differential lock pedal 44 operated It is possible to prevent the arm 60 from operating. Accordingly, blocking means for blocking the transmission of the operation of the differential lock pedal 44 to the operation arm 60 side is configured by the first elongated hole 70A of the arm member 70.

On the other hand, when the downward operation of the diff lock pedal 44 is stopped, the diff lock pedal 44 is moved upward by the urging force of the elastic spring 74, and the rear arm 73 moves around the axis P4 in the left-right direction as shown in FIG. It swings clockwise and the third linkage rod 71 is pulled backward. Then, the arm member 70 swings around the vertical axis P3 in the clockwise direction in FIG. 8, the operating member 41 is slid by the urging force of the elastic spring 42, and the operating member 41 is separated from the case 40a. Thus, the front wheel differential mechanism 40 enters the differential operation state.
[Operation status of operation tool]
The operation status of the operation arm 60 will be described with reference to FIGS. FIG. 12 is a side view of the vicinity of the operation arm 60 for explaining the operation state of the operation arm 60, and FIG. 13 is a schematic side view of the riding rice transplanter for explaining the use state of the operation arm 60.

  As shown in FIG. 12, when the operation arm 60 is swung forward from the storage position A where the operation arm 60 swings most backward and rises, the operation arm 60 moves from the storage position A to the front. In the range up to the operation start position B in which the predetermined angle α1 is swung forward, the operation of the operation arm 60 is not transmitted to the arm member 70, and the operation shaft 43 of the front wheel differential mechanism 40 is not operated. The predetermined angle α1 is an angle formed by the bending error of the elongated hole portion 64A, the elastic spring 74, a manufacturing error from the operation arm 60 to the arm member 70, and the like.

  When the operation arm 60 is swung to the operation start position B, the operation of the operation arm 60 is transmitted to the arm member 70, and the operation shaft 43 of the front wheel differential mechanism 40 is rotated. When the operation arm 60 is further swung forward, and the operation arm 60 is swung further from the operation start position B to the intermediate position C swung forward by a predetermined angle α2, the operation member 41 is engaged with the case 40a, The front wheel differential mechanism 40 enters the differential lock state. The predetermined angle α2 is an angle formed by the range of X in FIG.

  When the operation arm 60 is further swung forward, and the operation arm 60 is swung further from the intermediate position C to the work position D swung further forward by the second predetermined angle β, the operation is performed in the differential lock state of the front wheel differential mechanism 40. The bracket 60a of the arm 60 comes into contact with the restricting member 55b, and the downward pressing operation of the front part of the machine body becomes possible. The second predetermined angle β is an angle formed by the range of Y in FIG.

  That is, in the range of the first predetermined angle α between the storage position A and the intermediate position C (the first half portion of the swing range of the operation arm 60), even if the operation arm 60 is swung, the front wheel differential mechanism 40 is It is not operated in the differential lock state and remains in the differential operation state. The operation arm 60 is swung forward beyond the intermediate position C and swung to the range of the second predetermined angle β between the intermediate position C and the work position D (the second half of the swing range of the operation arm 60). When moved, the front wheel differential mechanism 40 enters the differential lock state.

  In this embodiment, the second predetermined angle β between the intermediate position C and the work position D is set to be larger than the first predetermined angle α between the storage position A and the intermediate position C. The height at the intermediate position C of the grip portion 60A of the operation arm 60 is set near the upper limit height when the grip portion 60A of the operation arm 60 is gripped and operated from the front of the machine body.

  As shown in FIG. 13 (a), when operating the operation arm 60 from the front of the machine body, the operation arm 60 is tilted forward to the range of the second predetermined angle β, and within the range of the second predetermined angle β. Since the operation arm 60 is often operated (because there are many operations in a state where the operation arm 60 is swung relatively much forward), the front wheel differential mechanism 40 is brought into the differential lock state within the range of the second predetermined angle β. By doing so, it is possible to improve the straightness of the machine body and to improve the workability of the crossing work using the operation arm 60 from the front.

  Further, by swinging the operation arm 60 from the ground between the storage position A and the work position D, the differential lock state and the differential operation state of the front wheel differential mechanism 40 can be switched while operating the operation arm 60 from the ground. it can. As a result, while operating the operation arm 60 from the ground, the state of the front wheel differential mechanism 40 can be switched according to the work situation, and the operability of the operation arm 60 from the ground can be improved.

  As shown in FIG. 13B, when performing seedling planting work, the operation arm 60 can be laid forward within the range of the first predetermined angle α, and the center mascot 60a can be erected. In this case, in the range of the first predetermined angle α, the front wheel differential mechanism 40 is not operated in the differential lock state and remains in the differential operation state, so when the seedling planting operation is performed with the operation arm 60 lying down forward, It is possible to prevent the front wheel differential mechanism 40 from entering the differential lock state. Accordingly, the operation arm 60 is tilted forward within the range of the first predetermined angle α, and the marker marks formed on the surface are raised by the side markers (not shown) mounted on the left and right sides of the rear part of the aircraft. The seedling planting operation can be easily performed while checking with the center mascot 60a.

In this case, since the center mascot 60a is positioned at a position far from the operator by swinging the operation arm 60 forward, the line of sight can be seen from the state where the operation arm 60 is kept standing at the storage position A. The marker mark formed on the paddy surface by the side marker and the position of the raised center mascot 60a can be easily visually confirmed. Thereby, seedling planting work can be performed with high accuracy.
[Airframe stop switch structure and electrical circuit]
The structure and electric circuit of the airframe stop switch 80 provided in the operation arm 60 will be described with reference to FIGS. FIG. 14 is an electric circuit diagram of the riding type rice transplanter. FIG. 14 shows a state where the power from the battery 81 is supplied to the controller 85 and the like, and the machine body stop switch 80 is not pushed.

  As shown in FIGS. 1 to 3, an airframe stop switch 80 capable of stopping the airframe while operating the operation arm 60 from the ground is mounted on the upper portion of the left arm portion 60 </ b> B of the operation arm 60 at the storage position A. ing. The machine body stop switch 80 is disposed so that the operation portion 80a faces rearward at the storage position A of the operation arm 60 and faces upward at the work position D of the operation arm 60.

  Accordingly, when the riding type rice transplanter is operated from the front of the aircraft by the operation arm 60, when it is desired to stop the aircraft, the gripper 60A of the operation arm 60 is gripped by one hand and the gripper 60A is gripped. The body can be stopped by extending the hand opposite to the hand slightly to the rear side of the body and pressing the operation unit 80a of the body stop switch 80 from above.

  The airframe stop switch 80 may be provided on the right arm portion 60B, the airframe stop switch 80 may be provided on the grip portion 60A, and the front portion of the airframe (for example, the front bonnet 14, the front portion of the step portion 17, etc.) ) May be provided at a position where the operation arm 60 can be operated while operating. Further, in the case where the airframe stop switch 80 is provided in the arm portion 60B, the airframe stop switch 80 is rotated about 90 degrees to the outside of the airframe with respect to the arm portion 60B, and the operation portion 80a is arranged to face the airframe laterally outward. May be.

  When the operation unit 80a is pressed, the airframe stop switch 80 automatically holds (locks) the pressed state of the operation unit 80a, and turns the operation unit 80a to release the holding (lock) of the operation unit 80a. Thus, it is comprised by the rotation release type pushbutton switch. Thereby, the state in which the airframe stop switch 80 is pushed and operated can be released by turning the operation unit 80a.

  Although not shown, the fuselage stop switch 80 has a built-in or attached lamp-type or light-emitting diode-type indicator lamp, and the indicator lamp lights up or blinks when the operation section 80a is not pushed and operated. The indicator is turned off when the button is pressed. Thereby, the operation state of the airframe stop switch 80 can be confirmed visually. In addition, the structure which arrange | positions an indicator lamp in the vicinity of the body stop switch 80 and the driving | running | working part 4 may be employ | adopted, and when the operation part 80a is pushed, it may comprise so that an indicator lamp may light or blink. Good.

  As shown in FIG. 14, the aircraft is equipped with a battery 81 serving as a power source for the riding rice transplanter, and a first connection position BAT of a key switch 83 is connected to the battery 81 via a fuse 82. The first connection position BAT of the key switch 83 is connected to the regulator 84, whereby the power from the generator 93 (generator) equipped in the engine E is transformed and rectified by the regulator 84, and the battery 81 is It is configured so that it can be charged.

  The second connection position IG of the key switch 83 is connected to electric devices such as the controller 85 and the lighting device 86, and the electric devices mounted on the riding type rice transplanter by supplying power from the second connection position IG. Is supplied with power.

  The third connection position ST of the key switch 83 is connected to the starter relay 88 via the safety switch 87. When the power from the third connection position ST is supplied to the starter relay 88, the power from the battery 81 is The engine E is supplied to the starter 89 of the engine E so that the engine E is started.

  A buzzer 91 and a buzzer relay 92 are connected to an output wiring portion from the second connection position IG of the key switch 83 via a fuse 90, and a machine body stop switch 80 is connected to the buzzer relay 92. Thereby, in a state where the airframe stop switch 80 is not pressed, power is supplied to the buzzer relay 92, the buzzer relay 92 is turned on, and the buzzer 91 does not sound.

  On the other hand, when the fuselage stop switch 80 is pressed, the wiring from the fourth connection position B of the key switch 83 is connected to the wiring from the ground connection position E of the key switch 83, the buzzer relay 92 is turned off, and the buzzer 91 sounds. start. As a result, the supply of electric power from the fourth connection position B of the key switch 83 to the engine E is cut off, and the spark plug (not shown) of the engine E stops igniting, and the engine E stops.

  Therefore, the power to the engine E can be short-circuited by the airframe stop switch 80, and the engine E can be stopped quickly and reliably. Further, since the buzzer 91 sounds when the machine body stop switch 80 is pressed, it is possible to grasp by hearing that the engine E is stopped by the operation of pressing the machine body stop switch 80.

  Further, for example, even when the operation is completed by removing the key from the key switch 83 while the machine stop switch 80 is being pressed, if the key is inserted into the key switch 83 again, the buzzer 91 Start ringing. Thereby, it can prevent misunderstanding that the engine E will not start by the trouble of the engine E.

  When the engine E is stopped by the airframe stop switch 80 and the operation unit 80a is turned to release the state where the airframe stop switch 80 is pushed, power is supplied to the buzzer relay 92 and the buzzer relay 92 is turned on. The sound of the buzzer 91 stops and the electric power from the fourth connection position B of the key switch 83 is supplied to the engine E. In this state, since the engine E remains stopped, the engine E can be started by turning the key switch 83 to the start position START again.

  In this embodiment, the example in which the engine E is stopped by shutting off the power supply from the fourth connection position B of the key switch 83 to the engine E is shown. You may comprise so that the engine E may be stopped by interrupting supply of electric power. Specifically, for example, a battery relay (not shown) is provided in a wiring portion from the battery 81 and the regulator 84 to the key switch 83, and the power supply to the key switch 83 is cut off by the battery relay, whereby the engine E May be configured to stop. Further, for example, when power is supplied from the controller 85 to the engine E, the power supply from the controller 85 to the engine E may be cut off. You may comprise so that supply of electric power may be interrupted.

Further, in this embodiment, an example is shown in which the airframe is stopped by stopping the engine E by the airframe stop switch 80, but the airframe may be stopped by different stopping objects. Specifically, for example, the brake device 19 may be configured to be mechanically or electrically operated to the braking side by the airframe stop switch 80 and may be configured to stop the airframe. The clutch 26 may be configured to be mechanically or electrically operated to the disengagement side, and configured to stop the airframe.
[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], an example is set in which the front wheel differential mechanism 40 is set to the differential lock state in the range of the second predetermined angle β between the intermediate position C and the work position D. Although shown, the second predetermined angle β may be set to a different angle, for example, the second predetermined angle β may be set to substantially the same angle as the first predetermined angle α, and the second predetermined angle β You may set to the angle larger than 1 predetermined angle (alpha). Further, for example, the second predetermined angle β may be changed and adjusted by changing and adjusting the range W of the elongated hole portion 64A of the intermediate arm 64.

In the above-mentioned [Best Mode for Carrying Out the Invention], in the range of the second predetermined angle β from the intermediate position C to the work position D (the second half of the swing range of the operating arm 60), the front wheel differential mechanism 40 is used. However, if the operation arm 60 is part of the swing range between the storage position A and the work position D, the front wheel differential mechanism 40 is in the differential lock state in a different range. For example, the front wheel differential mechanism 40 may be set to be in a differential lock state at an intermediate portion between the storage position A and the work position D. In the range up to the first predetermined angle α (the first half of the swing range of the operation arm 60), the front wheel differential mechanism 40 may be set to be in the differential lock state. Further, the front wheel differential mechanism 40 may be set to be in the differential lock state in a plurality of different ranges between the storage position A and the work position D.
[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] and [First Alternative Embodiment], the operating arm 60 is moved to the retracted position by compression of the long hole portion 64A of the intermediate arm 64 and the elastic spring 67. Although the example in which the front wheel differential mechanism 40 is configured not to be in the differential lock state in the range where the first predetermined angle α swings from A is shown, either one of the long hole portion 64A of the intermediate arm 64 and the compression of the elastic spring 67 is shown. Thus, the front wheel differential mechanism 40 may be configured not to enter the differential lock state.

Further, it may be configured such that the front wheel differential mechanism 40 is not brought into the differential lock state by subjecting different link members in the link path between the operation arm 60 and the front wheel differential mechanism 40 to long hole processing or the like. Specifically, for example, the first long hole 70A of the arm member 70 is extended counterclockwise in the plan view in FIG. 11, and the front wheel differential mechanism 40 is not brought into the differential lock state by the first long hole 70A of the arm member 70. You may comprise as follows.
[Third Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], and [Second Alternative Embodiment of the Invention], the operating shaft 43 and the operating arm 60 are connected by a link mechanism. Although an example of mechanical linkage has been shown, a different structure may be adopted as a mechanism for mechanically linking the operation shaft 43 and the operation arm 60. For example, a linkage rod, a linkage wire (including a push-pull wire), etc. For example, a combination (not shown) of a link mechanism, a linkage rod, and a linkage wire (including a push-pull wire) may be adopted.

In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], and [Second Alternative Embodiment of the Invention], the operating shaft 43 and the differential lock pedal 44 are connected by a link mechanism. Although an example of mechanical linkage has been shown, a different structure may be adopted as a mechanism for mechanically linking the operation shaft 43 and the diff lock pedal 44. For example, a linkage rod, a linkage wire (including a push-pull wire), etc. For example, a combination (not shown) of a link mechanism, a linkage rod, and a linkage wire (including a push-pull wire) may be adopted. [Fourth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], and [Second Alternative Embodiment of the Invention], and [Third Alternative Embodiment of the Invention] Although an example in which the operation shaft 43 and the operation arm 60 are mechanically linked is shown, a configuration in which the operation shaft 43 and the operation arm 60 are electrically linked may be employed.

  Specifically, for example, an actuator (for example, an electric motor or an electric cylinder, not shown) capable of electrically rotating the operation shaft 43 of the front wheel differential mechanism 40 is provided, and the swing position of the operation arm 60 is positioned. It is electrically detected by a detection means (for example, a potentiometer, a limit switch, etc., not shown). When the position of the operation arm 60 detected by the position detection means falls within the range of the second predetermined angle β, the operation means 43 is output from the control means (not shown) of the control device to the actuator and the operation shaft 43 of the front wheel differential mechanism 40 is moved. By rotating, the front wheel differential mechanism 40 is operated in the differential lock state. On the contrary, when the position of the operation arm 60 detected by the position detection means goes out of the range of the second predetermined angle β, the control means of the control device refuses output to the actuator and operates the front wheel differential mechanism 40 to the differential operation state. To do.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], and [Second Alternative Embodiment of the Invention], and [Third Alternative Embodiment of the Invention] Although the example in which the operation shaft 43 and the differential lock pedal 44 are mechanically linked is shown, a configuration in which the operation shaft 43 and the differential lock pedal 44 are electrically linked may be adopted.

  Specifically, for example, an actuator (for example, an electric motor, an electric cylinder, etc., not shown) capable of electrically rotating the operation shaft 43 of the front wheel differential mechanism 40 is provided, and the depression state of the differential lock pedal 44 is detected. It is electrically detected by means (for example, a potentiometer or limit switch, not shown). When the position of the differential lock pedal 44 detected by the state detection means is in the depressed position, the control means (not shown) of the control device outputs the actuator to the actuator to rotate the operation shaft 43 of the front wheel differential mechanism 40, The front wheel differential mechanism 40 is operated to the differential lock state. On the other hand, if the position of the differential lock pedal 44 detected by the state detection means is not in the depressed position, the control means of the control device stops the output to the actuator and operates the front wheel differential mechanism 40 to the differential operation state.

A configuration in which both the operation arm 60 and the differential lock pedal 44 are electrically linked to the operation shaft 43 may be employed, and only one of the operation arm 60 and the differential lock pedal 44 is electrically linked to the operation shaft 43. You may employ | adopt the structure to do. For example, when the configuration in which both the operation arm 60 and the differential lock pedal 44 are electrically linked to the operation shaft 43 is adopted, the operation shaft 43 of the front wheel differential mechanism 40 may be operated by a single actuator. Good.
[Fifth Embodiment of the Invention]
[Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], and [Invention] In the fourth embodiment of the embodiment], the front wheel differential mechanism 40 is configured to be operated in the differential lock state in a part of the swing range of the operation arm 60 between the storage position A and the work position D. However, the brake device 19 or the main clutch 26 may be configured to operate within a part of the swing range of the operation arm 60 between the storage position A and the work position D. In this case, the front wheel differential mechanism 40 may be operated to the differential lock state, and the brake device 19 or the main clutch 26 may be operated. Hereinafter, an example in which the brake device 19 or the main clutch 26 is configured to operate in conjunction with the swinging operation of the operation arm 60 will be specifically described.

  For example, the operation arm 60 (for example, the bracket 60a, the intermediate arm 64, etc.) and the brake device 19 (for example, the operation shaft 19a, the operation arm 19b, etc.) are linked mechanically or electrically. In the range where the second predetermined angle β swings to the storage position A side, the brake device 19 is not operated to the braking side, and if the operating arm 60 swings to the range of the first predetermined angle α, the brake device 19 brakes. To be operated sideways. Thereby, in the range of the second predetermined angle β, it is possible to run while pushing down the front portion of the aircraft, and when the aircraft is to be stopped, the operation arm 60 is moved up to the range of the first predetermined angle α. The brake device 19 can be operated to the braking side by swinging it to the stop side, so that the airframe can be simply and quickly stopped, and the workability of the crossing work can be improved.

  For example, the operation arm 60 (for example, the bracket 60a, the intermediate arm 64, etc.) and the main clutch 26 (for example, the tension arm 26a, etc.) are mechanically or electrically linked, for example, the operation arm 60 is moved from the working position D to the storage position A side. In the range where the second predetermined angle β swings, the main clutch 26 is operated to the on-side, and when the operating arm 60 swings to the range of the first predetermined angle α, the main clutch 26 is operated to the disengagement side. Configure as follows. Thereby, in the range of the second predetermined angle β, it is possible to run while pushing down the front portion of the aircraft, and when the aircraft is to be stopped, the operation arm 60 is moved up to the range of the first predetermined angle α. The main clutch 26 can be operated to the disengagement side by swinging in the direction, and the machine body can be simply and quickly stopped, so that the workability of the crossing work can be improved.

Further, for example, the operating arm 60 is mechanically or electrically linked to the brake device 19 and the main clutch 26, and the operating arm 60 swings from the working position D to the storage position A side by a second predetermined angle β. When the main clutch 26 is operated to the ingress side without operating the brake device 19 to the braking side and the operating arm 60 is swung to the range of the first predetermined angle α, the brake device 19 is operated to the braking side and the main device is operated. The clutch 26 may be configured to be operated to the disengagement side. Thereby, the body can be stopped more reliably.
[Sixth Embodiment of the Invention]
[Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], [Invention of the Invention] In the fourth embodiment of the embodiment and the fifth embodiment of the invention, the operation arm 60 is shown as an example of the operation tool, but the operation tool is different as long as it has the same function. For example, an operation handle (not shown) or an operation lever (not shown) may be adopted. For example, the present invention can be similarly applied to an operating tool (not shown) configured to be operable from the ground by swinging the handle H forward.

  [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], [Invention of the Invention] In the fourth embodiment of the embodiment and the fifth embodiment of the invention, the operation arm 60 is swingably supported on the front portion of the airframe, and the operation arm 60 as the operation tool is stored in the storage position A. Although the example in which the position can be changed to the work position D is shown, a different structure may be adopted as a structure in which the operation tool can be changed to the storage position and the work position D. You may employ | adopt the structure slidably supported to a direction.

  Specifically, for example, the operating tool is supported slidably in the front-rear direction at the front of the machine body, the operating tool is slid backward and stored in the front part of the machine, and the operating tool is moved forward. The position can be changed to the work position slid. Then, an intermediate position in which the operating tool is slid forward from the storage position by a predetermined length is set between the storage position and the work position. For example, the front wheel differential mechanism 40 is differentially locked between the intermediate position and the work position. Configure to be in a state.

  [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], [Invention of the Invention] In the fourth embodiment of the embodiment and the fifth embodiment of the invention, a riding type rice transplanter provided with a seedling planting device 6 having a four-row planting specification is shown as an example. The present invention can be similarly applied to a riding type rice transplanter equipped with a seedling planting device 6 having specifications.

Overall side view of riding rice transplanter Overall plan view of riding rice transplanter Overall front view of riding rice transplanter Side view of the front of the riding rice transplanter Schematic plan view explaining the brake pedal linkage structure Cross section of mission case Longitudinal side view explaining the linkage structure of the operating arm Cross-sectional plan view explaining the linkage structure of the operating arm Detailed side view near the base end of the operating arm in the retracted position Detailed side view near the proximal end of the operating arm at the work position Plan view around the arm member Side view of the vicinity of the operating arm explaining the operating status of the operating arm Schematic side view of a riding rice transplanter explaining the operating status of the operation arm Electric circuit diagram of riding rice transplanter

4 Driving section 13 Floor 19 Brake device 26 Main clutch 40 Front wheel differential mechanism
43 Operation shaft 44 Differential lock pedal (differential lock operation tool)
60 Operation arm (operation tool)
60C Center mascot (sighting member)
65 Second linkage rod (operator linkage rod)
70 arm member 70A first slot (blocking means)
70B 2nd slot (blocking means)
71 Third linkage rod (Differential lock operation tool linkage rod)
80 Airframe stop switch A Storage position C Intermediate position D Working position H Steering handle

Claims (9)

An operating tool that can be repositioned to the storage position stored in the front part of the aircraft and the work position that moves forward from the storage position and can be operated from the ground is provided on the front side of the mission case ,
An intermediate position is set between the storage position and the work position, and the operation tool and the front wheel differential mechanism are operated between the intermediate position and the work position so that the front wheel differential mechanism is operated in a differential lock state . Are linked via a linkage rod located on the lower side of the mission case,
A diff lock operation tool different from the operation tool is provided on the floor of the driving unit, and the front wheel diff mechanism is configured to be operated in a diff lock state by the diff lock operation tool.
Riding type rice transplanter provided with blocking means for preventing the operation of the diff lock operation tool from being transmitted to the operation tool side and preventing the operation of the operation tool from being transmitted to the diff lock operation tool side. Machine. The operation shaft of the front wheel differential mechanism is fixed with an arm member to which the linkage rod of the operation tool is linked and the linkage rod linked to the differential lock operation tool is linked .
The arm member is formed with a first elongated hole to which the linkage rod of the operation tool is linked and a second elongated hole to which the linkage rod of the differential lock operation tool is linked,
The blocking means prevents the operation of the differential lock operation tool from being transmitted to the operation tool side by the first elongated hole, and prevents the operation of the operation tool from being transmitted to the differential lock operation tool side. The riding type rice transplanter according to claim 1, which is blocked by the second elongated hole.   The riding type rice transplanter according to claim 1 or 2, wherein the operation tool is provided with an aiming member that serves as an aim at the time of planting traveling.   The riding type rice transplanter according to any one of claims 1 to 3, wherein the operation tool includes a machine body stop switch for stopping the machine body. By pressing toward the operating member downward in said working position from the ground, according to claim 1 that is configured to be pressed down the front of the body through the operating member Riding rice transplanter.   6. A part of the range between the storage position and the work position is configured such that the brake device is operated to the braking side or the main clutch is operated to the disengagement side. The riding type rice transplanter as described in any one of Claims.   The riding type rice transplanter according to any one of claims 1 to 6, wherein the operating tool is a steering handle that steers the front wheel to the right and left.   The operation tool is configured to be freely slidable in the front-rear direction, the operation tool is slid backward, the position of the operation tool is changed to the storage position, and the operation tool is slid forward. The riding type rice transplanter according to any one of claims 1 to 6, wherein the operation tool is configured to change a position to the work position.   The riding type rice transplanter according to claim 8, wherein a position where the operating tool is slid forward by a predetermined length from the storage position is set as the intermediate position.

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