JPH0640347A - Working vehicle - Google Patents

Abstract

PURPOSE:To prevent an accident caused by maloperation by constituting an operation lever, a side clutch, a side brake and a reversing transmission mechanism so as to operate in closer cooperation with each other, and carrying out a loose turn, a sharp turn or an excessive pivotal turn according to an operation lever setting position. CONSTITUTION:When an operation lever 5 is operated to the first setting position in either the left or the right, a directional control valve 42 is operated, and oil is sent to one of push cylinders 41L and 41R. Then, side clutch 2 of this side is disengaged, and a machine body makes a loose turn. When the operation lever 5 is operated to the second setting position in either the left or the right, relief pressure of a turn adjusting relief valve 44 is increased, and side brake of this side is operated, and the machine body makes a sharp turn. When the operation lever 5 is pulled further rearward from the second setting position, a direct return valve 55 carries out switching operation, and pressure of a relief valve 47 for an excessive pivotal turn is increased simultaneously, and thereby, the oil is sent to a reversing clutch 36. Then, this side wheel shaft is driven in an inverse direction, and the excessive pivotal turn is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle, such as a combine, having a pair of left and right traveling devices.

[0002]

2. Description of the Related Art Conventionally, in a work vehicle such as a combine, a left and right side clutches, left and right side brakes, and a left and right axles are reversed in a traveling mission for driving left and right chlorler type traveling devices. Some have a transmission mechanism. As this example, the one disclosed in JP-A-2-45276 will be described.

In this case, a single operating lever is provided in the steering section of the combine, and when the operating lever is tilted in one direction to the left and right, first, the side clutch on the tilting operating side is disengaged and the aircraft is Slowly turn in this direction.
Then, when the operating lever is further tilted, the side brake is operated in addition to the side clutch disengagement, the traveling device on this side is braked, and the machine rapidly turns in this direction. When the operation lever is further tilted beyond this, the reverse rotation transmission mechanism is actuated and the left and right traveling devices are rotationally driven in mutually opposite directions, so that the machine body makes a super-spinning turn.

[0004]

In the conventional work vehicle, as described above, the operations from the side clutch disengagement and side brake operation to the reverse rotation transmission mechanism operation can be performed by a single operation lever. It's easy. However, this operation only adjusts the tilt angle of the operating lever in the left-right direction, so if the operator mistakenly and abruptly tilts the operating lever by a large amount, the aircraft will suddenly turn into a supersonic turn. , There is a risk of causing an unexpected accident. That is, since the operation direction of the operation lever is straight, the operation is easy, but there is a problem that an operation error is easily induced.

[0005]

In order to solve the above-mentioned problems, the present invention takes the following technical means.
That is, with respect to the left and right traveling devices 1 and 1, the side clutches 2 and 2 that turn on and off the transmission of the driving force, the side brakes 3 and 3 that apply the braking force, and the left and right traveling devices 1 and 1 are opposite to each other. When the reverse lever transmission mechanism 4 for driving is provided and the operation lever 5 is operated from the neutral position to the first set position in the left-right direction, the side clutches 2, 2 on the operation side of the operation lever 5 are disengaged to operate the operation lever 5. Is operated beyond the first setting position to the second setting position in the left-right direction, the side brakes 3, 3 on the operating side of the operating lever 5 are actuated, and the operating lever 5 is moved to the second setting position. When the operation lever 5 and the side clutches 2 and 2 are operated in the front-rear direction, the reverse rotation transmission mechanism 4 is actuated so that the traveling devices 1 and 1 on the operation side of the operation lever 5 are reversely driven with respect to the other. , Side brake 3, And is obtained by the structure of the working vehicle, characterized in that a cooperative means 6 for interlocking the reversing transmission mechanism 4.

[0006]

The operation and effect of the present invention will be described. When the operation lever 5 is operated from the neutral position to the first set position on one side in the left-right direction by the operation of the operator or the automatic control output, the side clutch 2 on the operating side is disengaged and the traveling device 1 on this side is operated. The drive is cut off and the aircraft makes a gentle turn in this direction. When the operating lever 5 is operated beyond the first setting position to the second setting position in the left-right direction, the side brake 3 on the operating side operates in addition to the disengaged state of the side clutch 2. A braking force is applied to the traveling device 1 on the lever side to rapidly turn the machine body in this direction. Further, when the operation lever 5 is operated in the front-back direction from the second set position, the reverse rotation transmission mechanism 4 operates to drive the traveling device 1 on this side in the opposite direction to the other traveling device 1 to move the machine body. It makes a super-confined turn.

As described above, it is possible to freely perform the gentle turning, the sharp turning, and the super turning turning of the machine body by operating the single operation lever 5. Since the operation direction of the operation lever 5 from the slow turn to the sharp turn is made different from the operation direction up to the super transmission turn, the operation lever 5 is inadvertently operated due to an erroneous operation or the like. There is no chance that a turn will be initiated and an accident will occur. That is, it is possible to prevent erroneous operation of the operation lever 5 and to improve safety.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described by taking a combine as an example. The combine fuselage has a carcass 12 having a whole culm-type threshing device 8, a grain storage device 9, a control unit 10, an engine 11 and the like mounted above a chassis 7, and a cutting body is provided in front of the car body 12. The device 13 is configured to be movable up and down.

The control section 10 is provided with an operation lever 5, a shift lever 14, and a mowing threshing clutch lever (not shown). Further, right and left endless belt type traveling devices 1 and 1 are provided below the chassis 7. The left and right traveling devices 1,
1 is a structure which is driven by drive sprockets 16 and 16 provided from a transmission case 15 attached to the chassis 7.

The input case 2 is attached to the mission case 15.
0, auxiliary shift shaft 18, side clutch shaft 19, counter shaft 20, left and right axles 21L and 21R, reverse clutch shaft 2
2. The reverse rotation intermediate shafts 23 are rotatably arranged in parallel.
Then, an output shaft of an HST 24 that rotationally drives the input shaft 17 is connected to one end of the input shaft 17, and an output pulley 25 that outputs a driving force to the reaper 13 is attached to the other end. In addition, the shift shifter 2 is provided in the middle of the input shaft 17.
A gear group 2 which is slidable in the axial direction by the operation of 6
7 is provided. The output rotation of the HST 24 is adjusted by operating the shift lever 14.

An auxiliary transmission gear 28, which is selectively engaged with the transmission gear group 27, and a transmission gear 29 are fixed to the auxiliary transmission shaft 18. Also, the side clutch shaft 19
A center gear 30 that constantly meshes with the transmission gear 29 is attached to the center of the center gear 30, and side clutch gears that can be engaged and disengaged from the left and right of the center gear 30 on both the left and right sides of the center gear 30. 31L and 31R are provided so as to be slidable in the axial direction. The side clutches 2 and 2 (2L and 2R) are configured by the engagement and disengagement of the center gear 30 and the side clutch gears 31L and 31R.
Furthermore, friction plate type side brakes 3L and 3R are provided outside the side clutch gears 31L and 31R.

Further, the counter shaft 20 is provided with counter gears 32L and 32R, which are always meshed with the side clutch gears 31L and 31R, and forward rotation transmission gears 33L and 33R, which are integrated with these counter gears, respectively, so as to be rotatable.
In addition, a wheel gear 34 that is constantly meshed with the forward rotation transmission gears 33L and 33R is provided at one end of the axles 21L and 21R.
L and 34R are attached, and traveling devices 1L and 1R are attached to the other end.
The drive sprockets 16L and 16R for driving the

The reverse clutch shaft 22 is provided with a friction plate type reverse clutch 36 having an engaging body 35 which is always meshed with the wheel gear 34R, and a reverse transmission gear 37 is fixed thereto. Further, a reverse rotation intermediate gear 38 which is always meshed with the reverse rotation transmission gear 37 and a reverse rotation drive gear 39 which is constantly meshed with the wheel gear 34L are fixed to the reverse rotation intermediate shaft 23.

The operation system of the mission having the above configuration will be described. First, in the hydraulic circuit, the oil feed direction from the hydraulic pump 40 is set to the left and right push cylinders 41L,
A direction switching valve 42 that selectively switches over 41R is provided. In addition, the push cylinders 41L, 4
A turning adjustment relief valve 44 and a reverse rotation switching valve 45 are provided in the return oil passage from 1R. A pressure balance oil passage 46 taken out from the side clutch 2, 2 (2L, 2R) disengaged position of the push cylinders 41L, 41R is connected to an intermediate portion of the oil passage from the reverse rotation switching valve 45 to the reverse rotation clutch 36. Then, a relief valve 47 for super-spinning turning (relief valve for adjusting reverse rotation clutch pressure) is provided in the middle of the return oil passage from the connecting portion. Reference numeral 48 is a main relief valve. It should be noted that the relieving valve 44 for turning control and the relief valve 47 for turning a super-fine ground are used.
Is a variable relief valve whose relief pressure can be adjusted by operating an operation lever 5 described later.

The structure of the operation lever 5 will be described. First, the operation lever 5 has a cam portion 49 at its lower end.
And a middle portion thereof is pivotally attached to a plate body 50 that is tiltable in the front-rear direction with respect to the machine body so as to be tiltable in the left-right direction.
That is, this allows the operation lever 5 to tilt in the left-right direction and the front-back direction. Further, a swing adjusting relief valve 44 having a plate pressed by the tilting of the cam portion 49 is attached to the plate body 50. Further, left and right operation detection switches 51L and 51R for detecting left and right movements of the cam portion 46 are attached to both left and right sides of the cam portion 46. Also, on the machine side, there is a front / rear operation detection switch 52 for detecting that the plate body 50 is tilted in the front-rear direction, and a super-spinning turn having a plate pressed by the rearward tilting of the plate body 50. A relief valve 47 is provided. An operation guide plate 54 having a guide groove 53 for restricting and guiding the operation direction of the operation lever 5 is provided above the shaft attachment portion of the operation lever 5. The guide groove 53 is a substantially U-shaped hole composed of a straight line portion in the left-right direction and straight line portions that bend at a substantially right angle in the rearward direction at both end portions thereof. Between the position and the left and right ends, only the left and right tilting is possible, and at the left and right end, only the rearward tilting is possible. Further, a mowing elevating switch 54 for adjusting the mowing device 13 up and down is provided at the upper end of the operation lever 5.

With the above structure, when the operation lever 5 is tilted in the left-right direction from the neutral position and is operated to a position beyond the dead zone of the left-right operation detection switch 51 (first setting position), the left-right operation detection switch is detected. One of 51L and 51R is turned on, which causes the controller (not shown).
The direction switching valve 42 is switched by the output from the engine and oil is fed to one of the push cylinders 41L and 41R. As a result, the side clutch 2 on this side is in the disengaged state, and the machine body is in a state of gently turning in this direction.

When the operating lever 5 is operated beyond the first setting position to the left and right ends (second setting position) of the guide groove 53, the turning adjustment is performed in proportion to the tilt angle. The relief pressure of the relief valve 44 increases. As a result, the side brake 3 on this side is actuated, the braking force due to this is proportionally increased, and the aircraft is in a state of rapidly turning in this direction.

Further, when the operation lever 5 is pulled backward from the second setting position, the forward / backward operation detection switch 52 is turned on, and in addition to the switching operation of the direction switching valve 42, the reverse rotation switching valve 45. , And the direct return valve 55 provided in the bypass oil passage bypassing the turning adjustment relief valve 44 to perform switching operation. Along with this, the relief pressure of the relief valve 47 for super-spinning is increased, whereby oil is sent to the reverse clutch 36, and the reverse transmission mechanism including the oil is supplied by the operation of entering the reverse clutch 36. 4 operates to drive the operating side axle 21 in the opposite direction. At this time, the push cylinder 41 on the operating side is provided with the pressure balancing oil passage 4
Since the side clutch 2 on the operating side is held in the disengaged state by 6, there is no problem of mechanical lock. As a result, the aircraft is in a state of super turning on this operating side.

In addition to the above, the operation lever 5
The rotation base of the lever is provided with a left-right direction potentiometer 56 and a front-back direction potentiometer 57 for detecting the lever tilting angles in the left-right direction and the front-back direction. A total of four directions of two directions is shown.
As a result, the fact that the operation lever 5 has been operated in the front-rear direction from the center neutral position is indicated by the front-rear potentiometer 57.
Is detected, the mowing device 13 is adjusted up and down by the output from the controller. Further, when the left / right potentiometer 56 detects that the operation lever 5 has been operated in the left / right direction, the output from the controller causes the side clutch 2 to be disengaged at the first set position, resulting in a gentle turning, Between the 2 set positions, the side brake 3 is turned on, and a sharp turn is made. Further, when it is detected by the left / right direction potentiometer 56 and the front / rear direction potentiometer 57 that the operation lever 5 is operated in the diagonally forward direction, the control is performed.
Based on the output from the la, the gentle turning by disengaging the side clutch 2 and the downward adjustment of the cutting device 13 are simultaneously performed. When the left and right potentiometers 56 and the front and rear potentiometers 57 detect that the operation lever 5 has been operated obliquely rearward, the reaper 13 is adjusted upward by the output from the controller. However, the side clutch 2 is disengaged at the first setting position to make a gentle turn, the side brake 3 enters at the second setting position to make a sharp turn, and the reverse rotation is made until the third setting position beyond this. The transmission mechanism 4 operates to make a super turning turn. With this configuration, turning and vertical adjustment of the reaper 13 can be performed at the same time,
Work efficiency is improved.

The grain storage device 9 is provided with a grain discharge device 58 for discharging the inside grains to the outside. The grain discharging device 58 has a lower spiral 59 that takes over the grains from the transfer spiral at the bottom of the grain storage device 9 and conveys them by lift, and a middle spiral 60 that takes over the grains from the lower spiral 59 and conveys them.
The upper spiral 61 takes over the grains from the middle spiral 60 and discharges them to the outside. The lower spiral 59 is configured to be driven in conjunction with the spiral at the bottom of the grain storage device 9, and a large-diameter bevel gear 62 is attached to the upper end of the lower spiral 59. Also, one end of the middle spiral 60 has a bevel gear 6 of a medium diameter that meshes with the bevel gear 62.
3, and a bevel gear 64 having a medium diameter is attached to the other end. Further, a bevel gear 65 having a small diameter that meshes with the bevel gear 64 is attached to one end of the upper spiral 61. With this transmission configuration, the rotational speeds of the three spirals are set so that the middle spiral 60 is larger than the lower spiral 59 and the upper spiral 61 is further larger than the middle spiral 60. That is, the conveying speed is set to be higher on the lower side of the conveyance. With this setting, there will be no trouble such as clogging of conveyed grains.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part in an embodiment of the present invention.

FIG. 2 is a front view of a main part in one embodiment of the present invention.

FIG. 3 is a side view of a main part in one embodiment of the present invention.

FIG. 4 is a front sectional view of a mission case according to an embodiment of the present invention.

FIG. 5 is a hydraulic circuit diagram in an embodiment of the present invention.

FIG. 6 is a side view of the combine in the embodiment of the present invention.

FIG. 7 is a plan view of an essential part in another embodiment of the present invention.

FIG. 8 is a front view of a main part in another embodiment of the present invention.

FIG. 9 is a side view of a main part in another embodiment of the present invention.

FIG. 10 is a cross-sectional view of another main part in the example.

[Explanation of symbols]

 1 Traveling device 2 Side clutch 3 Side brake 4 Reverse rotation transmission mechanism 5 Operation lever 6 Connection means

Claims (1)

[Claims] 1. Side clutches 2 and 2 for transmitting and receiving driving force to and from left and right traveling devices 1, 1, side brakes 3 and 3 for applying braking force, and left and right traveling devices 1, 1.
When the operation lever 5 is operated from the neutral position to the first set position in the left-right direction, the side clutches 2 on the operation side of the operation lever 5 are disengaged. The operation lever 5 to the first
When the operation is performed beyond the set position to the second set position in the left and right direction, the side brake 3 on the operation side of the operation lever 5
When the operation lever 5 is operated from the second set position in the front-back direction, the reverse rotation transmission mechanism 4 is operated and the operation lever 5 is operated.
The operating lever 5 and the side clutch 2, so that the traveling device 1, 1 on the operating side of 5 is driven in reverse with respect to the other.
2. A working vehicle characterized in that a connecting means 6 for connecting the 2, side brakes 3, 3 and the reverse rotation transmission mechanism 4 is provided.