JP5206539B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle that performs work. In particular, the present invention relates to a shift operation lever for a work vehicle.

  In the shift operation configuration of the work vehicle, a main shift lever for operating the main transmission for traveling is provided on one of the right and left sides of the aircraft below the steering handle, and the other of the right and left sides of the aircraft on the lower side of the steering handle. In addition, a PTO transmission lever that operates a PTO transmission device that performs a shift for driving a work implement mounted on a work vehicle is provided, and the main transmission lever and the PTO transmission lever are easily operated. Yes (Patent Document 1).

JP 2006-341737 A (FIGS. 10 and 18)

  According to the present invention, in a work vehicle in which a steering handle can be adjusted in the front-rear direction around a tilt axis, a main transmission lever is attached using the tilt axis, and the operation structure of a strong main transmission is simplified while simplifying the configuration. It is something to be realized.

  According to the first aspect of the present invention, in a work vehicle that transmits engine power to the front wheels (3) and the rear wheels (4) via the main transmission in the transmission case (2), a tilt shaft (14) in the left-right direction is provided. The steering handle (13) is configured to be adjustable forward and backward, and a shift operation groove (22) is provided along the front-rear direction on one side of the left and right sides of the steering handle (13). , A neutral groove (22n) in the left-right direction at the middle portion in the front-rear direction, a forward transmission groove (22a) extending forward from one side of the neutral groove (22n), and from the left and right other sides of the neutral groove (22n) to the rear The main transmission lever (21) for operating the main transmission is supported on the tilt shaft (14) and is movable along the transmission operation groove (22). The tilt shaft (14) has the main transmission lever ( The forward arm portion (21b) for forward shift of the main transmission and the reverse arm portion (21c) for reverse shift of the main transmission that can be operated in 1) are respectively pivotally supported, and the forward arm portion (21b) ) Is connected to the main transmission forward cable (26) for shifting the main transmission, and the reverse arm portion (21c) is connected to the main transmission reverse cable (31) for shifting the main transmission. And a working vehicle.

  According to the first aspect of the present invention, when the main transmission lever (21) is operated from the neutral groove (22n) along the forward transmission groove (22a), the main transmission forward cable (26) is pushed and pulled, so that the main transmission is moved forward. The speed is changed to speed, forward 2 speed and forward high speed. Further, when the main transmission lever (21) is operated from the neutral groove (22n) along the reverse transmission groove (22b), the main transmission reverse cable (31) is pushed and pulled to reversely shift the main transmission.

  Since the steering handle (13) is an important member, the tilt axis (14) for adjusting the front and rear of the steering handle (13) is firmly configured. Since the shift lever (21), the forward arm portion (21b), and the reverse arm portion (21c) are supported, the support structure of the main shift lever (21) can be easily and firmly supported to improve durability. . Further, since separate members for supporting the main transmission lever (21), the forward arm portion (21b), and the reverse arm portion (21c) are not required, the configuration in the handle column is simplified and the configuration is inexpensive.

The whole tractor side view. The side view of the steering handle part of a tractor. The front view of the steering handle part of a tractor. The side view of the steering handle part of a tractor. The side view of a main transmission lever part. The side view of a main transmission lever part. The top view and front view of a brake pedal. The side view of a clutch pedal. The top view of a clutch pedal. The side view of an automatic lever part, a cutting | disconnection front view. The top view of a tractor rear part. The top view of a tractor rear part and a rotary tillage apparatus. The side view of a raising / lowering lever part. The front view and top view of a raising / lowering lever part. The side view of a raising / lowering control valve. The side view of a raising / lowering control valve and a raising / lowering lever.

Hereinafter, an embodiment in which the present invention is applied to an agricultural tractor will be described based on the drawings.
As shown in FIG. 1, the tractor T has an engine (not shown) disposed in a hood 1 on the front side of the vehicle body, and the engine transmission power in the transmission case 2 is transmitted to the main transmission and auxiliary transmission of the transmission case 2. This is transmitted to the left and right front wheels 3 and 3 and the left and right rear wheels 4 and 4.

  In addition, a cylinder case (not shown) having a hydraulic cylinder (not shown) for raising and lowering the work implement is disposed on the rear upper part of the transmission case 2, and a lift arm is attached to the cylinder case (not shown). The lift arms 7 and 7 are pivoted up and down by an expansion and contraction operation of a piston of an elevating hydraulic cylinder (not shown). In addition, a three-point link mechanism (not shown) including an upper link and left and right lower links is provided on the rear side of the transmission case 2 to connect, for example, a rotary tiller (not shown) and lift arms 7 and 7. It is configured to move up and down.

  Further, a handle post 11 is erected on the rear side of the engine, a handle shaft 12 is mounted on the handle post 11, and a steering handle 13 is pivotally supported on the upper end portion of the handle shaft 12. A floor 18 is provided on the upper side of the transmission case 2, and a forward pedal (not shown), a reverse pedal (not shown), a left and right brake pedal (not shown), a clutch pedal (not shown), an accelerator pedal (not shown) are provided on the floor 18. (Omitted) etc. are provided. A seat 19 is provided behind the steering handle 13.

Next, based on FIG.3 and FIG.4, the transmission structure of the main transmission (not shown) provided in the mission case 2 is demonstrated.
Further, as shown in FIG. 4, the lower handle shaft 12a is mounted on the lower handle post 11a, the upper handle shaft 12b is mounted on the upper handle post 11b, and the lower handle shaft 11a and the upper handle shaft 12b are universally coupled. And the upper end of the lower handle post 11a and the lower end of the upper handle post 11b are pivotally supported around the tilt axis 14 in the left-right direction, and fixed at a predetermined rotation adjustment position by the tilt lever 15 The handle 13 is configured to be adjustable forward and backward.

  As shown in FIG. 4, the tilt shaft 14 pivotally supports the boss portion 21a of the main speed change lever 21, and the boss portion 21a pivotally supports the operation lever portion 21c so as to be rotatable about the longitudinal axis 21b. The main transmission lever 21 is configured to be rotatable in the front-rear direction and the left-right direction. A forward arm portion 21d and a reverse arm portion 21e are pivotally supported on the left and right sides of the boss portion 21a of the tilt shaft 14, respectively.

  As shown in FIG. 3, an operation panel 20 is provided at the upper part of the handle post 11 of the steering handle 13, and a speed change operation groove 22 is provided along the front-rear direction on the left side thereof. The shift operation groove 22 is divided into a neutral groove 22n in the horizontal direction in the middle in the front-rear direction, and a forward shift groove 22a having a forward first speed position, a forward second speed position, and a forward high speed position extending forward from, for example, a central portion of the neutral groove 22n. And a reverse speed change groove 22b having a reverse position extending rearward from the left side of the neutral groove 22n, and the main speed change lever 21 is configured to be operable to these speed change positions.

  Thus, when the main speed change lever 21 is operated to the right along the neutral groove 22n and the forward speed change to the forward speed change groove 22a becomes possible, the speed change engagement portion at the base of the main speed change lever 21 is engaged with the forward arm portion 21d. Accordingly, the forward arm portion 21d can be operated. When the main speed change lever 21 is operated to the left side of the neutral groove 22n and can be moved to the reverse groove 22b, the base gear shift engagement portion of the main speed change lever 21 is engaged with the reverse arm portion 21e, and the reverse arm The part 21e becomes operable.

  One end of the inner cable 26a of the main transmission forward cable 26 is connected to the tip of the forward arm 21d, and one end of the outer cable 26b is fixed to the bracket 27 of the handle post with nuts 28,. Yes. Further, as shown in FIG. 5, a main transmission arm 29 for operating the main transmission is provided on the left side of the transmission case 2, and the other end of the main transmission advance cable 26 extends to the vicinity of the main transmission arm 29. The other end of the inner cable 26a is pin-connected to one end of the main transmission arm 29, and the other end of the outer cable 26b is fixed to the bracket 27 of the transmission case 2 with nuts 28,.

  Further, one end of the inner cable 31a of the main transmission reverse cable 31 is connected to the tip of the reverse arm portion 21e, and one end of the outer cable 31b is fixed to the bracket 27 of the handle post so as to be adjustable by nuts 28,. Yes. The other end of the main transmission reverse cable 31 extends to the vicinity of the main transmission arm 29, the other end of the inner cable 31a is pin-connected to the other end of the main transmission arm 29, and the other end of the outer cable 31b is connected to the transmission case 2. It is fixed to the bracket 27 on the side with nuts 28,.

  Accordingly, when the main transmission lever 21 is moved from the center of the neutral groove 22n to the forward first speed position, the forward second speed position, and the forward high speed position of the forward transmission groove 22a, the inner cable 26a of the main transmission forward cable 26 is pulled, The main transmission is shifted to the first forward speed, the second forward speed, and the forward high speed. When the main transmission lever 21 is operated from the left side of the neutral groove 22n to the reverse transmission position along the reverse transmission groove 22b, the inner cable 31a of the main transmission reverse cable 31 is pulled, and the main transmission is shifted backward. .

  As shown in FIG. 6, the forward arm 21d and the main transmission arm 29 for operating the main transmission are configured to be operable via a first forward rod 33a, an intermediate arm 33b, and a second forward rod 33c. The reverse arm portion 21e and the main transmission arm 29 for operating the main transmission may be configured to be operable via the first reverse rod 34a, the intermediate arm 34b, and the second forward rod 34c.

  According to the above configuration, since the main transmission lever 21 is supported on the tilt shaft 14 for front-rear adjustment of the steering handle 13, the support configuration of the main transmission lever 21 can be simplified and strongly supported.

Next, the lock configuration of the left and right brake pedals 41f and 41r will be described with reference to FIG.
On the floor 18, the left and right brake pedals 41f and 41r are juxtaposed so as to be freely depressed. A mounting bolt 42 is attached so as to be orthogonal to the back surface of the right brake pedal 41r, and a lock arm 43 is pivotally supported on the mounting bolt 42 and is prevented from coming off by a nut 42a. A box-shaped sensor holder 44 is attached to the rear surface of the left brake pedal 41f, and a lock sensor 45 is attached to the sensor holder 44 with bolts and nuts.

  A detection plate portion 43a and an operation portion 43b extending in the rotational direction intersecting with the longitudinal direction are formed at the distal end portion of the lock arm 43. Thus, when the front end side of the lock arm 43 is rotated and as shown by a solid line in FIG. 7, the left and right brake pedals 41f and 41r are locked by entering and fitting into the notch 44a of the sensor holder 44, the left and right brakes The device is in an integrated operating state. In this state, the detection hole 45a for irradiating the detection light of the lock sensor 45 is closed by the detection plate portion 43a of the lock arm 43, and the lock state is detected.

  According to the above configuration, the lock arm 43 is held in the locked state by the notch portion 44a of the sensor holder 44, so that it can be reliably locked while preventing the left and right brake pedals 41f and 41r from moving due to bending. Further, since the detection light of the lock sensor 45 is detected by the detection plate portion 43a that is long in the rotation direction of the lock arm 43, the locked state can be reliably detected even if the left and right brake pedals 41f and 41r vibrate.

Next, the clutch disengagement holding structure of the clutch pedal 51 will be described based on FIG. 8 and FIG.
A main clutch (not shown) is provided between the output shaft of the engine (not shown) of the tractor and the input shaft of the transmission case 2, and a foot-type clutch pedal 51 for turning the main clutch on and off is provided on the floor 18. . A base portion of the arm portion 51a of the clutch pedal 51 is pivotally supported by a left and right axis, and a lock pin 52 is provided at a lower portion of the clutch pedal 51 on the distal end side of the arm portion 51a so as to protrude to the left and right sides.

  Further, the bracket 54 on the floor 18 side is provided with a hook 53 so as to be positioned on one side of the left and right sides of the rotating portion of the arm portion 51a and below the lock pin 52 at the main clutch disengagement position. . The hook 53 is composed of a straight arm portion 53a and a hook portion 53b having a bent tip. The base portion of the arm portion 53a is pivotally supported by a left and right shaft 53c, and between the arm portion 53a and the bracket 54. A return spring 55 is interposed, and the arm portion 53a is urged so as to be positioned below the lock pin 52 at the main clutch disengagement position in a state along the front-rear direction. An operation lever 56 for manual operation is attached to the hook 53.

  According to the above configuration, the clutch pedal 51 is stepped on from the high clutch engaged position to the low clutch disengaged position, and the lock pin 52 on the clutch pedal 51 side is moved to the upper position where it contacts or approaches the arm portion 53a of the hook 53. Then, the main clutch is disengaged, and the hook portion 53b of the hook 53 is engageable with the lock pin 52 on the clutch pedal 51 side. Next, when the operation lever 56 is operated in the counterclockwise direction of FIG. 8, the arm portion 53a of the hook 53 rotates counterclockwise, and the lock pin 52 is locked by the hook portion 53b. Return rotation can be prevented and the clutch pedal 51 can be held in the main clutch disengaged state.

  Further, when the clutch pedal 51 is further stepped down from the clutch pedal 51 in which the lock pin 52 is engaged with the hook portion 53 b of the hook 53, the arm portion 53 a is rotated clockwise by the urging force of the return spring 55. As a result, the lock pin 52 on the clutch pedal 51 side can be detached from the hook portion 53b. Next, when the foot is removed from the clutch pedal 51, the clutch pedal 51 is returned to the upper clutch disengagement position by the action of the return spring 57, and the hook 53 and the operation lever 56 are also rotated clockwise by the urging force of the return spring 55. To return to the normal open state.

For example, when a seedling transplanting operation is being performed by a seedling transplanting machine, it is necessary to stop the aircraft from running when the seedling is replenished or fuel is cut off.
According to the above configuration, the clutch pedal 51 can be engaged and disengaged in a normal disengaged state only by depressing the clutch pedal 51 with a foot, and is not locked in the disengaged state. Further, only when the operator is willing to lock the clutch pedal 51 in the clutch disengaged state, the operator can manually operate the operation lever 56 and pull the hook 53 to the locked position while keeping the clutch pedal 51 depressed. The main clutch disengagement can be locked, and erroneous operation can be prevented.

Next, a plowing depth adjustment configuration of the rotary plowing device 63 will be described based on FIGS. 10 to 12.
The three-point link mechanism 61 is provided at the rear part of the body of the tractor T, and a rotary tiller 63 is connected to the tractor T so that the lift arms 7 and 7 can move up and down. The mission case 2 is provided with a lift control valve 64. As shown in FIG. 11, an elevating lever 62 for operating the elevating control valve 64 is provided, for example, on the right side of the seat 19, and the base of the elevating lever 62 is pivotally supported by a horizontal axis. When the lifting lever 62 is rotated forward, the spool 64a of the lifting control valve 64 is lowered to lower the rotary tiller 63, and when rotated backward, the rotary tiller 63 is raised. Yes.

  Further, the auto lever 70 is similarly configured to be pivotable to the side of the lift lever 62, and the spool 64a of the lift control valve 64 is actuated by moving the auto lever 70 up and down to move the rotary tiller 63 up and down. It is configured as follows.

  As shown in FIG. 10A, the bracket 64b of the elevation control valve 64 supports a cable operating arm 65 so as to be rotatable about a left and right axis 65a, and the arm portion of the auto lever 70 and the cable operating arm. The midway portion 65 is connected by an interlocking rod 66 whose length can be adjusted, and the base portion of the auto lever 70 and the distal end portion of the cable operating arm 65 are connected by a spring 71 to be urged.

  The front end portion of the auto cable 68 is connected to the front end side of the cable operating arm 65, and the rear end portion of the auto cable 68 is connected to the rear cover 63a that is attached to the rotary tiller 63 so as to be rotatable up and down.

  Thus, when the auto lever 70 is rotated from the position of FIG. 10A to the rear side (right side), the elevation control valve 64 is switched, the rotary tiller 63 is raised, and the auto lever 70 is rotated to the front side. When the rotary tiller 63 is lowered and the rear cover 63a is in contact with the ground, the rearward movement of the auto cable 68 is stopped, and the tillering operation can be performed while keeping the rotary tiller 63 at a predetermined tillage depth.

Next, the plowing depth adjustment structure of the auto cable 68 will be described.
The front end of the inner cable 68a of the auto cable 68 is connected to the tip of the cable operating arm 65, and a boot 76 is provided between the front end of the outer cable 68b of the auto cable 68 and the front end of the inner cable 68a. It is covered. The rear end of the inner cable 68a is connected to the rear cover 63a on the rotary tiller 63 side, the rear end of the outer cable 68b is fixed to the bracket on the rotary tiller 63 side, and the auto cable 68 is pushed and pulled to The cover 63a is configured to rotate up and down.

  A locking portion 68c is fixed to the front end portion of the outer cable 68b with front and rear nuts. Further, a lops frame 72 is provided on the side of the seat 19 of the mission case 2, and a tilling depth adjusting lever 73 is pivotally supported at a lower portion of the lops frame 72 so as to rotate about a left-right axis. The arm portion 73a of the tilling depth adjusting lever 73 is engaged with the retaining recess of the retaining portion 63c, a guide groove 74 with an adjusting scale is provided on the side of the lops frame 72, and the tilling depth adjusting lever 73 is moved back and forth along the scale. Is also configured to be movable and locked at a predetermined adjustment position.

  According to the said structure, by adjusting the tilling depth adjustment lever 73 back and forth and locking it in the guide groove 74, the front end of the locking portion 68c and the outer cable 68b is adjusted in the front-rear direction with respect to the inner cable 68a. The pulling allowance of the auto cable 68 can be adjusted. Therefore, the lowering rotation position of the rear cover 63a of the rotary tiller 63 can be adjusted up and down to adjust the tilling depth.

  In the conventional configuration, since the adjustment mechanism of the auto cable 68 is provided on the rotary tiller device 63 side, it is inconvenient that the operator has to get off the tractor to adjust the plowing depth when the plowing operation is required.

  However, according to the above-described configuration, the operator can adjust the tilling depth by operating the tilling depth adjusting lever 73 while riding on the tractor during the scraping operation. Further, the tilling depth adjusting lever 73 is attached by using the existing lops frame 72, and the tilling depth adjusting lever 73 is disposed in the vicinity of the front end portion of the auto cable 68. Therefore, the configuration is simplified and the tilling depth adjusting lever 73 is arranged. This makes it easy to understand the arrangement location of the stubble, and the tilling depth can be adjusted smoothly.

  Further, when connecting the front end of the inner cable 68a of the auto cable 68 to the cable operating arm 65, the arm 65 is provided with a plurality of mounting holes (not shown) along the longitudinal direction. When connected to the mounting hole on the side, the auto cable 68 can be moved sensitively, and when connected to the mounting hole on the tip side, the auto cable 68 can be moved insensitively.

Next, another embodiment of the lifting lever 62 will be described with reference to FIGS.
In the working machine lifting device that lifts and lowers the rotary tiller 63 by operating the lifting control valve 64 by the lifting lever 62, a protrusion 81 is provided on the left and right sides of the middle of the lifting lever 62, and the movement miracle of the protrusion 81 of the lifting lever 62 A guide plate 82 is provided along. A recess 82 a into which the protrusion 81 can be fitted is provided in a part of the guide plate 82, and the guide plate 82 is configured to be adjustable along the movement miracle of the protrusion 81. Reference numeral 82b denotes a slide adjusting lever for the guide plate 82.

  When the headland is cultivated by the rotary cultivator 63, the cultivating claws of the rotary cultivator 63 are lowered to the extent that they do not touch the field, the tractor T is moved backward to bring the rotary cultivator 63 closer to the bank, and then the cultivating depth There is a process of starting tillage work.

  In this case, it is difficult to see how far the rotary tiller 63 has been lowered, and the lifting lever 62 is operated slowly to lower the tillage claw of the rotary tiller 63 so that it does not come in contact with the ground, and then the machine is moved backward to rotate the rotary tiller 63. It is necessary to approach the shore and lower it to the plowing position. This embodiment is intended to facilitate the tilling work on the bank and to increase the work efficiency.

  According to the above configuration, the guide plate 82 is slid and adjusted in the operating direction of the elevating lever 62 to adjust the position of the recess 82 a of the guide plate 82. Then, the position where the protrusion 81 of the elevating lever 62 is fitted and stopped in the recess 82a is set to a position where the tilling claw of the rotary tiller 63 is not touched.

  Accordingly, when the elevating lever 62 is lowered and the protrusion 81 is fitted in the recess 82a of the guide plate 82 and the elevating lever 62 is stopped, the elevating lever 62 stops once at a position where the tilling claw of the rotary tiller 63 is not grounded. be able to. Next, the tractor is moved backward to move the rotary tiller 63 to the shore, and then, the rotary cultivator 63 holds the predetermined tillage depth from the shore by performing an operation to lower the elevating lever 62 to the tilling position. While being able to work tillage efficiently.

Next, the embodiment of FIG. 15 will be described.
In the working machine lifting device that lifts and lowers the rotary tiller 63 by operating the lifting control valve 64 by the lifting lever 62, a lowering speed adjustment lever 85 is provided on the spool 64a of the lifting control valve 64, and the spool 64a is moved in the longitudinal direction. It can be adjusted to a normal speed reduction position (position shown in practice in FIG. 15), or can be adjusted to a low speed reduction position (position shown by an imaginary line in FIG. 15). Thus, when the spool 64a is adjusted to the low speed lowering position, the amount of oil flowing from the lifting cylinder (not shown) of the rotary tiller 63 to the tank (not shown) via the spool 64a can be extremely reduced. The device 63 can be lowered slowly.

  According to the above-described configuration, when the normal tillage work is performed on the field by the rotary tiller 63, the spool 64a of the elevating control valve 64 is adjusted to the normal speed lowering position by the lowering speed adjusting lever 85, thereby rotating the rotary tiller. Plowing work can be efficiently performed while moving up and down 63 quickly. When the headland is cultivated, the spool 64a of the elevating control valve 64 is adjusted to the low speed lowering position by the lowering speed adjusting lever 85. Then, the rotary tiller 63 is slowly lowered and adjusted, and the descent is stopped once at a position where the tillage claws of the rotary tiller 63 do not come into contact with the ground. Then, the tractor is moved backward to bring the rotary tiller 63 to the side. The headland can be smoothly cultivated while moving and then lowered to a predetermined tillage depth to prevent the rotary tiller 63 from being damaged.

Next, the work implement lifting control device will be described with reference to FIG.
This work implement lifting control device moves the work implement up and down by switching the hydraulic pressure by a mechanical lift control valve 64 that does not include a solenoid. A lift control valve 64 is provided at the upper rear side of the mission case 2, a lift lever 62 is provided on a bracket of the lift control valve 64 so that the lift lever 62 can be rotated about a horizontal axis, and a lift potentiometer 96 is provided at the base of the lift lever 62. Provided.

  A spool operating arm 91 is attached to the spool valve 64 a of the elevation control valve 64, and an arm potentiometer 92 is provided at a fulcrum portion of the arm 91. One end of the interlocking rod 93 is pin-connected to the tip of the arm 91, and the other end of the interlocking rod 93 bent is pin-connected to the rotation drive part of the lifting / lowering motor 94 attached to the bracket of the lifting / lowering control valve 64. Yes.

  When the elevating lever 62 is moved up and down, the operation position is detected by the elevating potentiometer 96 and sent to a controller (not shown). Next, a lifting / lowering command is output from the controller to the lifting / lowering motor 94 to rotate forward and reverse, the interlocking rod 93 is pushed and pulled, the spool valve 64a is switched, and the rotary tiller 63 is lifted and lowered.

  Also, the spool operating arm 91 is provided with a long hole 91a as shown in FIG. 16B, and the end of the interlocking rod 93 is pin-adjusted along the long hole 91a of the arm 91 in an adjustable manner. The operating ratio of the arm 91 can be changed.

  According to the above configuration, the ascending / descending speed of the work machine is increased by connecting the interlocking rod 93 to the base side of the long hole 91a of the arm 91, and the interlocking rod 93 is connected to the distal end side of the long hole 91a of the arm 91. By doing, the raising / lowering speed of a working machine can be made slow.

2 Transmission case 3 Front wheel 4 Rear wheel 14 Tilt shaft 13 Steering handle 21 Main shift lever 22 Shifting operation groove 21b Forward arm portion 21c Reverse arm portion 22n Neutral groove 22a Forward shift groove 22b Reverse shift groove 26 Main shift forward cable 31 Main shift reverse cable cable

Claims (1)

  In a work vehicle that transmits engine power to the front wheels (3) and the rear wheels (4) via the main transmission in the transmission case (2), the steering handle (13) is moved by the left / right tilt shaft (14). The shifting handle groove (22) is provided along the front-rear direction on the left and right sides of the steering handle (13), and the shifting operation groove (22) is provided on the left and right sides of the middle portion in the front-rear direction. Direction neutral groove (22n), forward transmission groove (22a) extending forward from one side of the neutral groove (22n), and reverse transmission groove (22b) extending rearward from the left and right other side of the neutral groove (22n) The main transmission lever (21) for operating the main transmission is supported by the tilt shaft (14) and is movable along the transmission operation groove (22). The tilt shaft (14) Can be operated by the main transmission lever (21). A forward arm portion (21b) for forward shifting of the main transmission and a reverse arm portion (21c) for reverse shifting of the main transmission are each pivotally supported, and the main arm (21b) is provided with the main arm (21b). A work vehicle characterized in that a main transmission forward cable (26) for transmission transmission is connected, and a main transmission reverse cable (31) for main transmission transmission is connected to the reverse arm portion (21c).

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