JP2008006979A - Rear part working operation device for tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear part working operation device for a tractor capable of performing safe advancement/retreating operation since a rear shuttle switch is turned ON by the fact that advancement/retreating operation of rearward direction of the tractor satisfies a rear shuttle condition such as that a rear seat 2 is in the state of rearward working operation, that a front shuttle lever 3 performed at a front seat 1 is positioned at a neutral position, and that a vehicle speed by main shift or sub-shift is positioned at the lowest position. <P>SOLUTION: In the tractor in which work is performed while performing advancement/retreating operation at forward/rearward sitting attitude, an advancement/retreating switching device 39 is switched to any one by the front shuttle lever 3 in which advancement/retreating operation is performed at the front seat 1 or the rear shuttle switch 6 in which advancement/retreating operation is performed at the rear seat 2. It is operably provided making that a vehicle speed is set/operated at the lowest position, that the front shuttle lever 3 in which advancement/retreating operation is performed at the front seat is positioned at the neutral position, and that the vehicle speed is set/operated at the lowest position as the condition of execution of advancement/retreating by the rear shuttle switch 6. When it is turned ON by the rear shuttle switch 6, an advancement/retreating selector valve is outputted and advancement and retreating can be performed. When the shuttle condition is not satisfied, advancement and retreating cannot be performed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rear work operation device that is seated in a rearward posture on a rear seat of a tractor vehicle body and performs a forward / backward work operation, and is intended to perform a safe operation.

For example, a technique for providing a front loader on the front side of the tractor vehicle body and arranging a rear seat and a backhoe on the rear side to move forward and backward is used (see Patent Document 1) and forward and backward movement for operating the vehicle body forward and backward. A technique for providing a lever, a forward / reverse switch, etc. (see, for example, Patent Document 2) is known.
JP-A-2005-256408 (page 12, FIG. 5).

  In an operation mode in which the operation operation of the rear part of the vehicle body is performed in a state where the vehicle is seated on the rear seat, it is necessary to switch the forward / reverse operation, which is complicated and troublesome. And since it is a form which can be operated in a front sheet | seat and a back sheet | seat, it is easy to involve the danger on operation.

  According to the first aspect of the present invention, in a tractor that operates while moving forward and backward in a forward and backward seating posture, the front shuttle lever 3 that moves forward and backward with the front seat 1 or the rear shuttle that moves forward and backward with the rear seat 2 The switch 6 is configured to switch the forward / reverse switching device 39 to one of them, and the rear seat 2 is in the state of the backward work operation, and the front shuttle lever 3 that performs the forward / backward operation with the front seat 1 is in the neutral position. In addition, the rear work operation device is configured to be operable as a condition for executing the forward / rearward movement by the rear shuttle switch 6 that the vehicle speed is set to the lowest position.

  The tractor work is normally seated on the front seat 1 and can be moved forward and backward by operating the front shuttle lever 3, while the backhoe and the like are seated on the rear seat 2 and operated by operating the rear shuttle lever and the like. . This backward operation is performed by switching the forward / reverse switching valve of the forward / reverse switching device by turning on the rear shuttle switch 6. At this time, the ON by the rear shuttle switch 6 is such that the posture of the rear seat 2 is in the neutral position of the front shuttle lever 3, and the shift position by the main transmission, the sub-transmission, or the like is at the lowest position, etc. Is performed as a shuttle condition, that is, a condition for forward / reverse execution by the rear shuttle switch 6. Thereafter, when the shuttle switch 6 is turned on, the forward / reverse switching valve is output, and the vehicle can move forward and backward. When the shuttle conditions are not satisfied, the vehicle cannot move forward and backward.

  The invention according to claim 2 is characterized in that the front / rear shuttle switch 6 is composed of two main switches 6M and a sub switch 6S that can output simultaneously. To turn on the rear shuttle switch 6 by pressing the main switch 6M and the sub switch 6S at the same time, the ON output can be made when the shuttle condition is satisfied, and the vehicle can move forward and backward. For this reason, it is necessary to pay special attention to pressing both the main switch 6M and the sub switch 6S at the same time.

  The invention according to claim 3 is characterized in that a confirmation sound is emitted for a predetermined time by the operation of the rear shuttle switch 6. As described above, when the rear shuttle switch 6 is pressed and turned on, a confirmation sound for a predetermined time is transmitted when the shuttle conditions are satisfied, and it can be confirmed that a forward or reverse operation has been performed. . When this confirmation sound is not transmitted, it is possible to check whether there is any misoperation or whether the shuttle condition is satisfied.

  The invention according to claim 4 is characterized in that any one of the switches 6M or 6S among the rear shuttle switches 6 is in the form of an illumination switch that is turned on during a pressing operation and is lit for a predetermined time. When the shuttle switch 6 is pressed and turned on as described above, the switch 6 that has been operated is illuminated for a certain period of time when the shuttle conditions are met, so it is confirmed that a forward or reverse operation has been performed. can do. When the switch 6 is not lit, it is possible to check for erroneous operation or whether the shuttle conditions are satisfied.

  According to the first aspect of the present invention, when the tractor is moved backward and forward, the rear seat 2 is in the state of the rearward working operation, and the front shuttle lever 3 performed on the front seat 1 is in the neutral position. Since the rear shuttle switch 6 is turned on by satisfying a rear shuttle condition such that the vehicle speed by the main shift or the sub shift is at the lowest position, a safe forward / backward operation can be performed.

  In the invention according to claim 2, the rear shuttle switch 6 as described above can be operated forward and backward by simultaneously pressing and operating the two switches of the main and sub switches 6M and 6S. Therefore, it is necessary to pay special attention, so that erroneous operations can be eliminated.

  The invention according to claim 3 can determine whether or not an appropriate operation is being performed based on the presence or absence of a confirmation sound that all the rear shuttle conditions as described above are in place, Safe operation can be performed.

  In the invention according to the fourth aspect, confirmation that all the rear shuttle conditions as described above are satisfied can be performed by lighting the shuttle switch 6 for a certain period of time after the pushing operation. Easy to check, accurate and safe operation.

  Based on the illustrated example, the tractor vehicle body 10 has a front wheel 12 steered by a steering handle 11 and a rear wheel 13, and is driven and driven by a four-wheel drive vehicle driven by an engine 15 mounted under a front bonnet 14. The configuration of the form.

  The front seat 1 is mounted between the left and right fenders 16 at the rear, and a cabin or sunroof 17 is provided on the upper part of the steering section extending from the front seat 1 to the front handle 11 and the like. A front loader 18 can be mounted on the front side of the vehicle body 10, and a backhoe 19 or the like can be mounted on the rear side. The front loader 18 is supported by the front bracket 9 provided at the front portion of the vehicle body 10. A loader arm 20 is supported on the front bracket 9 and is lifted and lowered by a hydraulic expansion / contraction lift cylinder 21, and the front end bucket 22 is configured to rotate a scooping angle and a dumping angle by expansion and contraction of the bucket cylinder 23. .

  The backhoe 19 is supported by an outrigger 25 with a rear bracket 24 attached to the rear end of the vehicle body 10. A swing bracket 26 is provided at the rear portion of the bracket 24 so as to be turnable around a turning shaft 27 in the vertical direction, and a lift arm 28 is provided so as to be able to be turned up and down with respect to the turn bracket 26. It can be moved up and down. Further, a bucket 30 is provided at the rear end of the lift arm 28 so as to be rotatable up and down, and is provided so as to be rotatable by hydraulic expansion and contraction of the arm cylinder 31.

  A bucket 32 is rotatably provided at the tip of the bucket arm 30 via a bucket link 33 and is rotatably provided by hydraulic expansion / contraction of the bucket cylinder 34. The rear seat 2 for operating the backhoe 19 and the operation table 35 are provided on the rear bracket 24, and the driver is seated in a rearward posture on the rear seat 2, and the rear shuttle lever on the operation table 35 is provided. 5 and the rear shuttle switch 6 are operated to operate the backhoe 19.

  The clutch housing 40, the transmission case 41, the axle housing 42, and the like that constitute the main body of the vehicle body 10 are provided with a main clutch 44 on an input shaft 43 that is input from the engine 15, and are interlocked with the input shaft 43. A forward / reverse switching device 39 is configured by providing shuttle clutches 46, 47 for switching from the neutral position N where transmission is stopped to the forward transmission position F and reverse transmission position R on the forward / reverse shaft 45. A main transmission gear 48 is provided on the main transmission shaft 48 linked with the forward / reverse shaft 45, and an auxiliary transmission gear 51 is provided on the auxiliary transmission shaft 50 to transmit the pinion gear shaft 52. The pinion gear shaft 52 transmits the rear wheel 13 via the rear differential gear 53 and also transmits the front wheel take-out shaft 54 that is linked to the front wheel 12. The forward / reverse switching device 39 includes forward / reverse solenoids 66 and 67 of an electromagnetic switching control valve of a hydraulic circuit that is controlled by a controller to be described later and operates the shuttle clutches 46 and 47 and the like.

  The front wheel take-out shaft 54 is provided with a front wheel clutch 55 for switching between 2WD and 4WD. Further, the PTO transmission shaft 56 is gear-transmitted from the input shaft 43 and the rear PTO shaft 57 is transmitted. A lift arm 59 that is lifted and lowered by a hydraulic cylinder 58 is provided at the upper rear end of the transmission case 41, and a working machine such as a rotary tiller that is attached to the rear part of the tractor via a three-point link mechanism or the like is mounted to move up and down. Can do.

  Here, the rear work operating device according to the present invention is a tractor that operates while moving forward and backward in a forward and backward seating posture. It is in a state of backward work operation, and the front shuttle lever 3 for forward / backward operation with the front seat 1 is in a neutral position and the vehicle speed is at the lowest position so that it can be operated as a rear shuttle condition. To do. The tractor work is normally seated on the front seat 1 and can be moved forward and backward by operating the front shuttle lever 3, while the backhoe and the like are seated on the rear seat 2 and operated by operating the rear shuttle lever and the like. . This backward operation is performed by switching the forward / reverse switching valve of the forward / reverse switching device 39 by turning on the rear shuttle switch 6.

  At this time, the forward / reverse execution condition by the rear shuttle switch 6, that is, the rear shuttle condition is turned on by the rear shuttle switch 6, the posture of the rear seat 2, the neutral position of the front shuttle lever 3, This is performed under conditions such that the shift position by the transmission, the auxiliary transmission, or the like is at the lowest position. That is, the rear shuttle condition means a condition for executing the forward / reverse operation by the rear shuttle switch 6. After that, when the shuttle switch 6 is turned on, the forward / reverse switching valve is output and the vehicle can move forward and backward. When the shuttle conditions are not met, the vehicle cannot move forward and backward.

  Further, the front / rear shuttle switch 6 is composed of two main switches 6M and a sub switch 6S that can output simultaneously. In order to press the rear shuttle switch 6 to turn it on, it is necessary to pay special attention to press both the main switch 6M and the sub switch 6S.

  In addition, a confirmation sound for a predetermined time is generated by operating the rear shuttle switch 6. As described above, when the rear shuttle switch 6 is pressed and turned on, a confirmation sound for a predetermined time is transmitted when the shuttle conditions are satisfied, and it can be confirmed that a forward or reverse operation has been performed. . When this confirmation sound is not started, it is possible to check whether there is any misoperation or whether the shuttle conditions are met.

  Further, any one of the rear shuttle switches 6 is configured as an illumination switch in which any one of the switches 6M or 6S is turned on during a pressing operation and is lit for a predetermined time. When the shuttle switch 6 is pressed and turned on as described above, the switch 6 that has been operated is illuminated for a certain period of time when the shuttle conditions are met, so it is confirmed that a forward or reverse operation has been performed. can do. When the switch 6 is not lit, it is possible to check for erroneous operation or whether the shuttle conditions are satisfied.

  When working with the front loader 18 mounted, by operating an operation lever or the like disposed near the dashboard section or the fender 16 section on the side of the front seat 1 while sitting on the front seat 1, Further, when the work is performed with the backhoe 19 mounted on the rear portion of the vehicle body 10 as described above, the operator operates the operation mechanism of the operation table 35 in a rearward posture after sitting on the seat 2. Work.

  In order to perform the backward shuttle operation, the rear shuttle switch 6 is operated as a condition for executing the forward / reverse operation by the rear shuttle switch 6, that is, the rear shuttle condition, the rear seat 2 is in the state of the backward work operation, It is necessary that the front shuttle lever 3 that moves forward and backward with the front seat 1 is in the neutral position N and that the vehicle speed is in the lowest position. Therefore, on the input side of the controller 60, the front seat 1 is seated on the front seat 1, and the front shuttle levers 4F, 4R operated by forward / reverse switching are operated by the front shuttle lever 3 and the like operated in the forward posture, and the rear seat 2 The rear shuttle lever 5 which is seated and operated in a backward posture and the rear shuttle switches 5F and 5R which are switched forward and backward by the linear switch buttons 36 and 37 of the operation table 35 are provided.

  Further, a main shift position sensor switch 61 for detecting a shift position by a main shift lever or the like of the main shift gear 49, a sub shift position sensor switch 62 for detecting a sub shift position by a sub shift lever or the like of the sub shift gear 51, and the like are provided. .

  With these shift position sensor switches 61 and 62, it is possible to determine in which position the traveling vehicle speed of the tractor is in the low speed to high speed range, in particular, in the lowest speed range. The rear seat 2 is configured in a folded form, a tilted form, etc. so that it can be seated backwards when in use, and is folded or stowed when not in use so that it can be operated in a forward operation. It is configured not to get in the way of raising and lowering. Thereafter, a sheet orientation sensor switch 63 for the rear seat 2 is provided for detecting that the rear seat 2 is in the rearward working operation state. In addition, a back-and-forth reversible seat form may be used.

  Further, the rear shuttle switch 6 turns on the rear shuttle switch 6F on the forward side from the switch OFF position by pushing the linear switch button 37 forward and rearward on the rear shuttle switches 6F and 6R. The shuttle switch 6R can be switched to be turned on, and this is set as a main switch 6M. Further, a sub switch 6S that is turned on when the linear switch button 36 is pressed may be provided on the side of the linear switch button 37. When the main switch 6M is switched to the forward switch 6F or the reverse switch 6R, the switch button 36 and the switch button 36 are pressed simultaneously to activate the sub switch 6S, and the controller 60 switches to the switching control valve. Can be output.

  On the output side of the controller 60, forward / reverse solenoids 66, 67 of an electromagnetic switching control valve of a hydraulic circuit for operating the shuttle clutches 46, 47, etc. are provided, and this boost solenoid 65 is provided. These forward solenoids 66 are output when the front shuttle switch 4 is turned on by the front shuttle lever 3 to switch the switching control valve so as to operate the forward side shuttle clutch 46 pack from the neutral position N to the forward position F so as to move forward. Let Further, the forward solenoid 66 is similarly driven forward by the forward solenoid 66 being output when the rear shuttle switch 6 is turned on by the rear shuttle lever 5. Further, the reverse solenoid 67 is operated in the same manner to switch the switching control valve to the reverse position R.

  In addition, when the rear shuttle switch 6 is operated as shown in FIG. 3, when the rear shuttle condition is satisfied, a monitor lamp 68 that is turned on is provided. The monitor lamp 68 is configured such that the switch buttons 36 and 37 to be pressed are in the form of a momentary illumination switch so that it can be easily confirmed simultaneously with the operation. Further, when the main switch 6M of the rear shuttle switch 6 is turned on and the sub switch 6S is turned on, a buzzer 69 is transmitted for a predetermined time t (for example, 3 seconds), and the boost solenoid 65 and the forward or reverse solenoid 66, 67 is output. This shuttle operation becomes invalid when the rear shuttle switch 6 is turned on and the front shuttle switch 4 is turned on, and the rearward shuttle operation on the rear seat 2 is restrained.

  Next, a reference example of the scaffold will be described based on FIG. A step plate 67 is provided on the rear bracket 24 attached to the three-point link hitch 65 at the rear end of the transmission case 41 by a hitch pin 66 or a separately attached bracket to provide a workability as a scaffold for a backward operation. Yes (Figure 7). An auxiliary plate 68 is attached to and removed from the left and right sides of the step plate 67 with mounting bolts 69 so that an operation tool or the like can be placed thereon. Further, the step plate 67 can be provided so as to be retractable by rotating upward (FIG. 8). The bracket 24 of the step plate 67 is attached to the hitch 65 so as to be vertically pivotable by a hitch pin 66, and the bracket 24 is stowed by a latch pin 70 provided at the front end portion thereof. The lying position is locked by a stopper pin 71 provided on the hitch 65. Reference numeral 72 denotes a lower link for connecting the rear working machines.

  Next, a reference example of hydraulic hose piping will be described based on FIG. A position control lever 76, a control valve 77, a hydraulic hose 78 connected to the position control lever 76, a control valve 77, and the like are provided on the right-hand side fender 16 of the front seat 1 to facilitate attachment / detachment of the hydraulic hose to / from the rear connection working machine. The control valve 77, the hydraulic hose 78, and the like are attached along the lower side of the fender 16. A connecting port 79 of a hydraulic hose 78 is disposed on the rear end surface of the fender 16, and the connecting port 81 of the hydraulic hose 80 on the work machine side can be plugged into the connecting port 79.

  Next, based on FIG. 10, a block diagram of an operation hydraulic circuit as a reference for the front loader 18, the backhoe 19 and the like is shown. A mode in which the front seat 1 is swung back and forth to switch to the rear rear seat 2 is shown. The operation of the front seat 1 and the operation of the rear seat 2 are switched to interlock the switching valve 85 of the hydraulic circuit. In the operation on the front seat 1 side, the switching valve 85 is switched to the hydraulic circuit 86 side such as the hydraulic cylinder 58 of the lift arm 59, the hydraulic cylinders 21 and 23 of the front loader 18, and the hydraulic power steering circuit of the steering handle 11. In the operation on the rear seat 2 side, the operation is configured to be switched to the hydraulic circuit 87 side such as the hydraulic cylinders 29, 31, 34 of the backhoe 19 and the hydraulic cylinder of the outrigger 25. P is a hydraulic pump and T is a tank port.

The block diagram of a rear part operation control part. The flowchart. The flowchart which shows a part another Example. The side view of a tractor transmission mechanism part. A side view of a tractor. The top view of the operation panel part. The disassembled perspective view which shows another example of a rear bracket part. The side view which shows the other example. The perspective view of a fender part. The block diagram of a hydraulic circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front seat 2 Rear seat 3 Front shuttle lever 4 Front shuttle switch 5 Rear shuttle lever 6 Rear shuttle switch 19 Backhoe 36 Linear switch button 37 Linear switch button 46 Forward side shuttle clutch 47 Reverse side shuttle clutch 50 Subtransmission shaft 51 Subtransmission gear 61 Main shift position sensor switch 62 Sub shift position sensor switch 63 Seat direction sensor switch

Claims (4)

  In a tractor that operates while moving forward and backward in a forward and backward sitting posture, a front shuttle lever (3) that moves forward and backward with the front seat (1) or a rear shuttle switch (6 that moves forward and backward with the rear seat (2) ) To switch the forward / reverse switching device (39) to any one of the above, and the front shuttle lever in which the rear seat (2) is in a backward work operation state and the front seat (1) is operated forward and backward. A rear work operation device characterized in that (3) is in the neutral position and the vehicle speed is set to the lowest position so that it can be operated as a condition for forward / reverse execution by the rear shuttle switch (6). .   The rear work operation device according to claim 1, wherein the rear shuttle switch (6) is configured by two main switches (6M) and a sub switch (6S) that can be output simultaneously.   The rear work operation device according to claim 1 or 2, wherein a confirmation sound for a predetermined time is generated by an operation of the rear shuttle switch (6).   The switch (6M) or (6S) of the rear shuttle switch (6) is in the form of an illumination switch that is turned on during a pressing operation and lit for a certain period of time. Or the rear work operation apparatus of the tractor of 3.

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