JP2008056022A - Tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that erroneous operation on operation and danger are easily accompanied since switching of advancement/retreating operation is required, the switching operation is complex and troublesome and it is in the form capable of being operated at a front seat and a rear seat in the working form that working operation at a rear part of a vehicle body is performed in the state that a person sits on the rear seat. <P>SOLUTION: In the tractor in which work is performed while performing advancement/retreating operation at front-directed and rear-directed sitting attitude, a rear shuttle switch 5 for performing advancement/retreating operation at the rear seat 2 is provided and the rear shuttle switch 5 is constituted by a main switch 6 capable of being outputted at the simultaneous operation and a sub-switch 7. The main switch 6 is constituted by an advancement switch 6F and a retreating switch 6R. Further, a rear steering switch 8 for operating left and right steering at a retreating side is provided and constituted by a left steering switch 8L and right steering switch 8R. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

A front loader is provided on the front side of the tractor body, a rear seat and a backhoe are arranged on the rear side to work while moving forward and backward, a forward / reverse lever for operating the vehicle forward and backward, a forward / backward switch, etc. Techniques (see, for example, Patent Document 1 and Patent Document 2) are known.
Japanese Patent Laying-Open No. 2005-256408 (page 12, FIG. 5). JP 2006-62572 A (page 4, 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 seat and a back seat, it is easy to accompany operation mistake and danger.

  According to the first aspect of the present invention, in a tractor that operates while moving forward and backward in a forward and backward sitting posture, a rear shuttle switch 5 that moves forward and backward with the rear seat 2 is provided, and the rear shuttle switch 5 is operated simultaneously. The main switch 6 is composed of a main switch 6 and a sub switch 7 that can output, the main switch 6 is composed of a forward switch 6F and a reverse switch 6R, and further includes a rear steering switch 8 for operating the left / right steering on the reverse side, The rear steering switch 8 is a tractor characterized by comprising a left steering switch 8L and a right steering switch 8R.

  In a tractor that works while moving forward and backward in a forward and backward sitting posture, the tractor work is normally seated on the front seat and can be operated forward and backward by operating the front shuttle lever. Then, move forward and backward by operating the shuttle switch 5 and the like. This backward work operation is performed by switching the forward / reverse switching valve of the forward / reverse switching device by operating the shuttle switch 5 thereafter. At this time, the rear shuttle switch 5 can be driven forward or backward by operating the main switch 6 and the sub switch 7 at the same time while paying special attention to operation. That is, it moves forward by simultaneously operating the sub switch 7 and the forward switch 6F, and moves backward by simultaneously operating the sub switch 7 and the reverse switch 6R.

  Further, during these operations, when the forward or reverse travel direction is changed to the left or right, the rear steering switch 8 is operated. That is, when the left steering switch 8L is operated, the steering is performed in the left direction, and when the right steering switch 8R is operated, the steering is performed in the right direction.

  The invention according to claim 2 is characterized in that the steering switch 8 is provided in the vicinity of the rear shuttle switch 5 and at a position where it can be operated with one hand together with the rear shuttle switch 5. It is a tractor.

  When the forward / backward movement by the rear shuttle switch 5 is performed and the left / right traveling direction is changed by the rear steering switch 8, the rear steering switch 8 located near the main switch 6 or the sub switch 7 is used. The same hand operating the switch 6 or 7 can be operated simultaneously.

  According to the first aspect of the present invention, the rear shuttle switch 5 for performing the backward and forward operation of the tractor is composed of the main switch 6 and the sub switch 7, and it is necessary to operate these two switches 6 and 7 simultaneously. Therefore, special attention is required for the operation, the erroneous operation is reduced, and the safe forward / backward operation can be performed. In addition, during the forward / backward operation, the rear steering switch 8 is operated to perform the steering. Can be performed simultaneously, and operability can be improved.

  According to the second aspect of the present invention, the rear shuttle switch 5 as described above comprises two switches, ie, a main switch 6 and a sub switch 7. The main switch is operated together with the simultaneous pressing operation of the switches 6 and 7. 6 or by operating the rear steering switch 8 near the sub-switch 7 with the same operator, the steering operation is performed together with the forward and reverse operations, thereby improving the operability and the safe rear work operation. It can be performed.

  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 boom 20 is supported on the front bracket 9 and moved up and down 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 able to turn around a turning shaft 27 in the vertical direction, and a lift boom 28 is provided so as to be able to move up and down with respect to the swing bracket 26. It can be moved up and down. Further, a bucket arm 30 is provided at the rear end of the lift boom 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. A rear seat 2 for operating the backhoe 19 and an operation table 35 are provided on the rear bracket 24, and a driver is seated in a rearward posture on the rear seat 2, and a rear working machine on the operation table 35 is provided. The operation of the backhoe 19 is performed by operating the operation tool for operation, the rear shuttle switch 5, the rear steering switch 8, and the like.

  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. Shuttle clutches 46 and 47 are provided on the forward / reverse shaft 45 to switch from the neutral position N of the shuttle clutch transmission stop to the gear transmission of the forward position F and the reverse position R. A main transmission gear 49 is provided, 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 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 moved up and down 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 of the tractor via a three-point (three-P) link mechanism is mounted. Can be moved up and down.

  In this case, the rear work operating device according to the present invention can output the rear shuttle switch 5 that operates forward and backward with the rear seat 2 in a tractor that operates while operating forward and backward in a forward and backward seating posture by simultaneous operation. The two main switches 6 and the sub switch 7 are provided, and a rear steering switch 8 for operating the reverse steering is provided. In a tractor that operates while moving forward and backward in a forward and backward seating posture, the tractor work is normally seated on the front seat and can be operated forward and backward by operating the front shuttle lever. Sit 2 and operate the rear shuttle switch 5 etc. to move forward and backward. This backward work operation is performed by switching the forward / reverse switching valve of the forward / reverse switching device by operating the shuttle switch 5 thereafter. At this time, the rear shuttle switch 5 can be driven forward or backward by operating the main switch 6 and the sub switch 7 at the same time while paying special attention to operation. Further, during these operations, when the forward or reverse travel direction is changed to the left or right, the rear steering switch 8 is operated.

  Further, the steering switch 8 is provided in the vicinity of the rear shuttle switch 5 where one hand operation is possible. When the forward / backward movement by the rear shuttle switch 5 is performed and the left / right traveling direction is changed by the rear steering switch 8, the rear steering switch 8 located near the main switch 6 or the sub switch 7 is used. The same hand operating the switch 6 or 7 can be operated simultaneously.

  In this embodiment, the rear shuttle switch 5 that is operated forward and backward with the rear seat 2 is in the state of the backward working operation, and the front shuttle switch 4 that is operated forward and backward with the front seat 1 is in the neutral position. Yes, and the fact that the vehicle speed is at the lowest position can be operated as a rear shuttle condition. The tractor operation is normally performed by sitting on the front seat 1 and turning the front shuttle switch 4 (forward switch 4F, reverse switch 4R) on and off by operating the front shuttle lever 3, and the shuttle clutches 46, 47 (forward / reverse switching device). ), The forward / reverse switching valve can be operated by the forward solenoid 66 output or the reverse solenoid 67 output. Further, the backhoe or the like moves forward and backward by sitting on the rear seat 2 and operating the rear shuttle switch 5. In this backward work operation, the forward / reverse switching valve is turned on by the forward solenoid 66 output or reverse drive by turning on the rear shuttle switch 5 (the forward switch 6F of the main switch 6 or the reverse switch 6R and the sub switch 7). This is done by switching the solenoid output 67. At this time, the ON state by the rear shuttle switch 5 indicates that the posture of the rear seat 2 is in the neutral position of the front shuttle switch 4, the main transmission gear 49 (main transmission device), and the auxiliary transmission gear 51 (sub transmission device). ) Etc., as a shuttle condition such as the fact that the shift position is at the lowest position. Thereafter, when the shuttle switch 5 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.

  When the rear shuttle switch 5 is pressed and turned on as described above, a confirmation sound is transmitted for a predetermined time when the shuttle conditions are satisfied, and it is confirmed that a forward or reverse operation has been performed. To be able to. 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, the main switch 6 or the sub switch 7 of the rear shuttle switch 5 is turned on during the pressing operation, and the switch button itself is turned on for a certain time. As described above, when the rear shuttle switch 5 is pressed and turned on, the switch 5 that has been operated is illuminated for a certain period of time when the shuttle conditions are satisfied, so that it is confirmed that a forward or reverse operation has been performed. can do. When the switch 5 is not lit, it is possible to check for erroneous operation or whether the shuttle conditions are met.

  When working with the front loader 18 in place, work 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 seated on the front seat 1. Manipulate. Further, when the work is performed with the backhoe 19 attached to the rear part of the vehicle body 10 as described above, the work is performed by sitting on the seat 2 and operating the operation mechanism of the operation table 35 in a rearward posture. In order to perform this rearward shuttle operation, the rear shuttle switch 6 is operated as the rear shuttle condition, the rear seat 2 is in the state of the rearward work operation, and the front shuttle lever that is operated to move forward and backward with the front seat 1 3, the front shuttle switch 4 and the like are in the neutral position N, and 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 A main switch 6 and a sub switch 7 in the form of linear switch buttons that are operated to switch forward and backward are provided on the upper surface of the operation console 35 as the rear shuttle switch 5 that is seated and operated in a backward posture. Thereafter, a rear steering switch 8 having the same configuration as this is disposed at a position close to the side of the shuttle switch 5. Both of these switches 6 and 8 are operated by switch buttons that are switched in a linear form. The main switch 6 is operated by pushing left and right from the switch OFF position of the neutral position. When the left side is pushed, the forward switch 6F is turned on while the button is pushed, and when the right side is pushed, the backward switch 6R is turned on. To be switched. Further, the rear steering switch 8 is operated to push forward and rearward from the neutral position OFF position. When the front side is pushed, the right steering switch 8R is turned on while the front side is pushed, and when the rear side is pushed, the left side is pushed. Switching operation is performed so as to turn on the steering switch 8L.

  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.

  Further, the rear shuttle switch 5 switches the forward switch 6F of the main switch 6 to ON from the switch OFF position or the reverse switch 6R to ON by simultaneously pressing the main switch 6 and the sub switch 7. It is composed. Further, the sub switch 7 on the front side of the main switch 6 is turned on when pressed. When switching to the forward switch 6F or the reverse switch 6R of the main switch 6, the sub switch 7 is pressed simultaneously with the sub switch 7 and becomes effective. The controller 60 can output the forward solenoid 66 or the reverse solenoid 67 of the switching control valve. When the switching control valve is OFF for both solenoids 66 and 67, the shuttle clutches 46 and 47 are both in the disengaged position and are in the neutral position N, and when the forward solenoid 66 is ON, the shuttle clutch 46 is engaged and the forward position is reached. When the reverse solenoid 67 is turned ON, the shuttle clutch 47 is engaged and the reverse position R is transmitted. In the illustrated main switch 6, the forward switch 6F and the reverse switch 6R are arranged in the left-right direction, but instead, the forward switch 6F is on the front side and the reverse switch 6R is on the rear side. It is also possible to provide it in a form synchronized with the traveling direction, so that erroneous operations can be reduced.

  Further, the rear steering switch 8 is turned on by pressing the left steering switch 8L or the right steering switch 8R from the switch OFF position and returns to the OFF state when released, and the left steering solenoid 71 or the right steering switch 8R is turned off. The direction solenoid 72 is output, the steering control valve is operated, and the steering clutch or the steering brake is output. These steering clutches or steering brakes are provided around the rear wheel transmission shaft extending from the rear differential gear 53 to the left and right rear wheels 13 inside the rear axle housing 42, and the steering clutch on either the left or right side is provided. Steering and turning the vehicle body running direction to this cutting side by turning off, or steering and turning the vehicle body running direction to this brake braking side by applying the steering brake on either the left or right side It is. Further, as a form in which both the steering clutch and the steering brake are mounted, it is possible to steer by disengaging the steering clutch and applying the steering brake. The rear steering switch 8 turns on the right steering switch 8R when the front side is pushed from the switch OFF position of the neutral position, and turns on the left steering switch 8L when the rear side is pushed. Solenoids 71 and 72 can be output. In addition, the rear travel switch 8 in this example is configured so that the pushing operation direction is directed back and forth, but instead, the left steering switch 8L is directed to the left and left to synchronize with the traveling direction, Further, the right steering switch 8R can be provided on the right side, and erroneous operations can be reduced.

  On the output side of the controller 60, there are provided reverse solenoids 66, 67 in front of an electromagnetic switching control valve of a hydraulic circuit for operating the shuttle clutches 46, 47 and the like, and a boost solenoid 65. These forward solenoids 66 are output when the front shuttle switch 4 is turned on by the front shuttle lever 3, and the switching control valve is switched to operate the forward-side shuttle clutch 46 from the neutral position N to the forward position F to advance. . Further, the forward solenoid 66 outputs in the same manner when the forward switch 6F of the rear shuttle switch 5 is turned on and travels forward. Similarly, the reverse solenoid 67 is operated to switch the switching control valve from the neutral position N to the reverse position B.

  When the rear shuttle switch 5 is operated, if the rear shuttle condition is satisfied, a monitor lamp 68 that is turned on is provided to indicate that the rear shuttle operation is effective. The monitor lamp 68 is configured such that the switch button itself to be pressed is in the form of a momentary illumination switch so that it can be easily confirmed simultaneously with the operation. Further, when the main switch 6 of the rear shuttle switch 5 is turned on and the sub switch 7 is turned on, a buzzer 69 is transmitted for a predetermined time, and the lifting solenoid 65 and the forward or backward solenoids 66 and 67 are output. ing. This shuttle operation becomes invalid when the rear shuttle switch 5 is turned on and when the front shuttle switch 4 is turned on, and the rear shuttle operation is restrained by the rear seat 2. Further, in order to ensure safety when the seat sensor 63 fails, it is possible to set so that the forward travel is not stopped even when the seat sensor 63 detects the rearward direction during the forward high speed travel.

  As described above, when the rear shuttle operation condition is not satisfied, the forward / reverse output is stopped, and the portion that does not satisfy this condition is configured to be identified by the number of outputs of the buzzer 69, the output pattern, and the like. For example, as an output pattern (1) in which the normal buzzer 69 is sounded for a certain time and the forward / reverse solenoids 66 and 67 are turned ON, the seat sensor 63 detects the backward direction, the forward switch is OFF before the front shuttle, and There are cases where the sub-transmission sensor detects the position of the first speed and the like. When the above conditions are not satisfied, the normal lamp 68 blinks in different patterns (2) to (5) for each unachieved portion. Here, in the pattern (2) of the lamp 68 blinking mode, it is assumed that the sheet sensor 63 detects the forward direction. Pattern (3) is when the front shuttle forward switch 4F or the reverse switch 4B is ON even when the seat sensor 63 is facing backward. Pattern (4) is when the auxiliary transmission sensor 62 does not detect the low speed position even when the seat sensor 63 is facing backward. Pattern (5) is when the main transmission sensor 61 does not detect the first speed position even when the seat sensor 63 is facing backward.

  The rear shuttle switch 5, the rear steering switch 8, and the like are disposed at the right hand side of the operation allowance 35. Further, a main key switch 76 is provided on the hand side, and a pilot lamp 77, a hazard lamp 78, etc. are arranged on the front side. Further, on the left side of these left hand, a throttle lever 79, a lifting switch 80 for raising and lowering the rear working machine by one-touch operation, a pump switch 81 with a lamp for indicating whether or not the hydraulic pump for working the rear working machine is driven, and rear working Height adjustment dial 82 for adjusting the lifting height of the machine, work light switch 83, adjustment dial 84 for adjusting the lifting height of the rotary tiller mounted on the three-P link, and externally mounted hydraulic operation A hydraulic lever guide 85 and the like for arranging and guiding the lever are arranged.

  Next, mainly based on FIGS. 5 to 7, the mount frame 88 for connecting the front bracket 9 to which the front loader 18 is mounted and the rear bracket 24 to which the backhoe 19 is mounted is simplified and reduced in weight. And it is set as the structure which maintains rigidity highly. The front bracket 9 is disposed on both the left and right sides of the front end portion of the clutch housing 40. The lower end portions of the left and right front brackets 9 are connected by fastening bolts 96 with connecting plates 89 passing through the bottom of the clutch housing 40, and the front bracket 9 portions on both the left and right sides connected by the connecting plates 89 are An appropriate gap portion 97 is formed between the pair of mounting plates 90 and 91, the rear portion is welded and connected by a bracket pipe 92 made of a round pipe, and the front end portions are overlapped from the left and right to be integrally welded. Yes. The front end portion of the mount frame 88 is connected to the rear portions of the mounting plates 90 and 91 by tightening bolts 93. The bracket pipe 92 is inclined to the upper part on the outer side, and a mounting bracket 94 as a main body of the front bracket 9 is integrally formed at the outer end. A connecting plate 95 protruding rearward from the bracket pipe 92 is provided, and a front end of the mount frame 88 made of each tube material is connected to a rear end portion of the connecting plate 95. A part of the connecting plate 89 is connected to the inside of the mount frame 88 by fastening bolts 93. In this way, the front bracket 9 to which the mount frame 88 is attached forms the gap portion 97 between the pair of plates 90 and 91 or the connecting plate 95 that are integrally attached to the bracket pipe 92, so that the rigidity of the front bracket 9 is increased. Can be increased.

  Further, the mount bracket 98 on the rear bracket 24 side is formed in a plate shape and is connected to both ends of the connection plate 99 extending right and left at the bottom of the rear end of the transmission case 41. The left and right mounting brackets 98 are attached to the rear end portion of the transmission case 41 or the rear axle housing 42 by tightening bolts 100. Such a front end surface of the mount bracket 98 and a rear end surface of the mount frame 88 are joined to each other by welding in the front and rear, and the joining plate 101 is applied along the inner side surface of these joints by welding or the like. Join. The joining plate 101 is bent at an appropriate angle to form an inclined piece portion 102, and a joint inclined surface 103 having the same inclination is formed at the rear end portion of the mount frame 88 facing the inclined piece portion 102. The piece 102 and the joining inclined surface 103 of the frame 88 are overlapped and joined by welding. Such a mounting frame 88 exerts a thrust force from the front side to the rear side when working with the front loader 18, and a thrust force from the rear side to the front acts when working with the backhoe 19. Since it is received between the rear end surface of the mount frame 88 and the joint inclined surface 103 and the front end surface of the mount bracket 98 and the inclined piece portion 102, the rigidity can be increased and stable work can be performed. it can.

  Next, when working with the backhoe 19 attached to the rear portion of the tractor vehicle body 10 mainly based on FIG. 8, a pair of left and right lower links 107 of a three-P link mechanism that works by attaching a normal rotary tiller or the like. In addition, since the pair of left and right lift rods 105 that connect the lower link 107 and the lift arm 54 are not required, during the backhoe operation, the lift rods 105 and the lower link 107 are removed and the predetermined positions are removed. Store in. The lift rod 105 can be supported and stored along the rear side of the support 106 at the rear end of the fender 16 (in the example shown, the rear support and the safety frame support of the sunroof 17). The lower link 107 is supported along the lower side between the left and right mount frames 88 so as to be housed.

  Next, mainly based on FIGS. 9 and 10, an oil subtank 110 made of the material SECC is attached to the side of the transmission case 41, and return oil such as the hydraulic pump 111 of the lift arm 59 is supplied to the hydraulic hose 112, It returns to this sub tank 110 through 113. The sub-tank 110 is thinner than the mission case 41 made of FC material, has good heat transfer, and returns the hydraulically actuated oil that is most likely to rise to the sub-tank 110, thereby effectively cooling the oil cooling. I can do it. The sub tank 110 communicates with the transmission case 41 via the hose 114 and returns the cooled oil to the transmission case 41.

  Further, in the sub tank 110 arranged on the left and right side of the mission case 41, the position of the communication port 115 of the hose 114 communicating with the mission case 41 is set to the front position of the mission case 41, and The communication port 115 of the sub tank 110 is set slightly lower than the oil surface Y of the mission case 41. As a result, as shown in FIG. 10, when the vehicle body 10 is tilted in the rearwardly lowered state, the oil surface Y1 in the sub tank 110 and the oil surface Y2 in the mission case 41 are independently formed. For this reason, the oil movement from the sub tank 110 into the mission case 41 is restricted, and an appropriate amount of oil is retained. Reference numeral 116 denotes an oil discharge port at the bottom of the mission case 41.

The top view of a rear part operation control part. The block diagram of a rear part operation control part. The side view of a tractor transmission mechanism part. A side view of a tractor. The top view and side view of a working machine mount frame part. The some enlarged plan view. FIG. The perspective view of the tractor vehicle body part. The arrangement side view of an oil subtank. The side view which shows the operation state.

Explanation of symbols

1 Front seat 2 Rear seat 3 Front shuttle lever 4 Front shuttle switch 4F Forward switch 4R Reverse switch 5 Rear shuttle switch 6 Main switch 6F Forward switch 6R Reverse switch 7 Sub switch 8 Rear steering switch 8L Left steering switch 8R Right steering Switch 19 Backhoe 35 Control stand 46 Forward shuttle clutch 47 Reverse shuttle clutch 66 Forward solenoid 67 Reverse solenoid 71 Left steering solenoid 72 Right steering solenoid N Shuttle clutch neutral position F Shuttle clutch forward position R Shuttle clutch reverse position

Claims (2)

  In a tractor that operates while moving forward and backward in a forward and backward sitting posture, a rear shuttle switch (5) that moves forward and backward with a rear seat (2) is provided, and the rear shuttle switch (5) can be output simultaneously. The main switch (6) is composed of a forward switch (6F) and a reverse switch (6R), and further operates a left / right steering on the reverse side. A tractor provided with a steering switch (8), the rear steering switch (8) comprising a left steering switch (8L) and a right steering switch (8R).   The tractor according to claim 1, characterized in that the steering switch (8) is provided in the vicinity of the rear shuttle switch (5) and at a position where it can be operated with one hand together with the rear shuttle switch (5).

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