JP2000279008A - Structure for changing running speed of paddy field working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable stable motion of a machine body of a paddy field working vehicle in the case of crossing over a footpath or loading and unloading of the vehicle on a carriage of a truck. SOLUTION: The objective running speed changer has a low-speed position to develop a running speed slower than the speed in the work on a paddy field. The speed changer is provided with an acceleration down means 40 to operate the acceleration position of an engine to a low-speed side when the running speed changer is shifted to the low-speed position. It is further provided with a manual accelerator operation tool 54 to enable free manual operation of the acceleration position of the engine to a high-speed side when the acceleration position of the engine is at the low-speed side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling speed change structure in a paddy field working vehicle such as a riding type rice transplanter or a riding type direct sowing machine.

[0002]

2. Description of the Related Art In general, a riding type rice transplanter, which is an example of a paddy field working vehicle, travels at a higher speed than a planting traveling speed such as traveling on a paddy field while planting seedlings and traveling on a road. Many high speed running speeds are provided with a variable speed transmission device.

[0003] In a paddy field, there is a height difference between the inside of the paddy (cultivation pad) and the ridge. At times, it has been proposed to configure the vehicle so that it can be stably moved at a low speed. In addition, it is proposed that the paddy field vehicle be lowered from the carrier of the transport truck via the footboard or be mounted on the truck platform so that the machine body can be stably moved at a low speed. Have been. In this case, a low-speed position for low-speed movement lower than the planting traveling speed is provided in the traveling transmission, or in addition to the traveling first transmission that can be freely shifted to the planting traveling speed and the high traveling speed, For example, a second speed change device for traveling that can change speed at a low speed position for low speed movement is arranged in series.

[0004]

In some paddy fields, the ridge may be high or the slope of the ridge may be steep.
Even in the truck bed, since the bed is high or the inclination of the step board is steep, it is not enough to operate the transmission (the second transmission) at the low-speed position for the low-speed movement. In some cases, it may be sufficient and it may be difficult to move the aircraft stably.

[0005] When crossing a ridge or loading / unloading a truck to / from a truck, the inclination of the aircraft becomes large. Therefore, it is better for the operator to hold the steering handle and the like with both hands as much as possible. As a result, when the operator holds the control handle or the like with both hands when crossing the ridge or loading / unloading the truck from / to the loading platform, it may be difficult to operate the low-speed position for low-speed movement. An object of the present invention is to provide a traveling speed change structure for a paddy field working vehicle, in which the airframe can be stably moved when crossing a ridge or when loading / unloading a truck from / to a truck bed. It is an object of the present invention to make it possible to easily perform an operation to a position.

[0006]

According to a first aspect of the present invention, there is provided a paddy field work in which a low speed position for producing a running speed lower than a work running position in a paddy field is provided in a traveling transmission. In a car, when the traveling transmission is operated to the low speed position, the accelerator position of the engine is automatically operated to the low speed side by the accelerator down means in conjunction therewith, and the engine speed is reduced. By configuring so that the number of revolutions of the engine is reduced in addition to the transmission for traveling in this way, a sufficiently low speed state can be obtained. Even if the inclination is steep, the aircraft can be stably moved at a sufficiently low speed. In this case, when the transmission is operated to the low-speed position, the accelerator-down means automatically lowers the accelerator position of the engine to the low-speed side even if the accelerator position of the engine is not artificially operated to the low-speed side. Operated.

As described above, when the traveling transmission is operated to the low speed position, a high torque power is transmitted to the traveling transmission system. In this case, the torque of the power transmitted to the traveling power transmission system can be suppressed by reducing the rotation speed of the engine (to the extent that the engine is not stopped).

[II] As described in the preceding item [I], when the traveling transmission is operated to the low speed position and the engine speed is reduced, the traversing of the ridges and the loading and unloading of the truck onto the cargo bed are performed while the engine speed is reduced. While doing so, you may need to move the aircraft slightly faster. In such a case, according to the feature of claim 1, the accelerator position of the engine can be artificially operated to the high speed side by operating the artificial accelerator operation tool. You can move the aircraft a little faster.

[III] According to the feature of the second aspect, similar to the first aspect, the "action" described in the above [I] and [II] is provided, and in addition, the following "action" is provided. "
It has. According to the feature of claim 2, the above item [II]
The artificial accelerator operating tool described in (1) is constituted by an accelerator pedal. As a result, as described in the preceding section [II], when the traveling transmission is operated to the low-speed position and it becomes necessary to move the aircraft slightly faster in a state where the engine speed is reduced, the pilot can The accelerator position of the engine can be artificially operated to the high-speed side by depressing the accelerator pedal without releasing both hands from the control handle or the like.

[IV] According to the feature of claim 3, claim 1
Similarly, in a paddy field working vehicle provided with a low-speed position for producing a traveling speed lower than the work traveling position in the paddy field in the traveling transmission, the traveling transmission is operated to the low-speed position. In conjunction with this, the accelerator position and the hand accelerator lever of the engine are automatically operated to the low speed side by the accelerator down means, and the engine speed is reduced. By configuring so that the number of revolutions of the engine is reduced in addition to the transmission for traveling in this way, a sufficiently low speed state can be obtained. Even if the inclination is steep, the aircraft can be stably moved at a sufficiently low speed. In this case, when the traveling transmission is operated to the low speed position, the accelerator position and the hand acceleration of the engine are controlled by the accelerator down means even if the accelerator position of the engine and the hand accelerator lever are not artificially operated to the low speed side. The lever is automatically operated to the lower speed side.

As described above, when the traveling transmission is operated to the low speed position, a high torque power is transmitted to the traveling transmission system. In this case, the torque of the power transmitted to the traveling power transmission system can be reduced by reducing the rotation speed of the engine (to the extent that the engine is not stopped).

[V] According to the feature of claim 3, the accelerator position of the engine is artificially operated to the high speed side and the low speed side by the hand accelerator lever, and the traveling transmission is operated to the low speed position. In this case, the accelerator position of the engine is automatically operated to the lower speed side, and the hand accelerator lever is also automatically operated to the lower speed side. This allows the operator to visually observe the automatic lowering operation of the hand accelerator lever as described above, so that the operator can view the current state (as the traveling transmission is operated to the lower speed position). Thus, it is possible to recognize that the accelerator position of the engine is automatically operated to the low speed side.

According to a third aspect of the present invention, an accelerator pedal is provided separately from the hand accelerator lever, and the accelerator position of the engine can be artificially operated to a high speed side by depressing the accelerator pedal. Is configured. Thereby, according to the feature of claim 3,
[II] [III] as in the case of claims 1 and 2
Described above.

[VI] According to the feature of claim 4, in a paddy field working vehicle provided with a low speed position for producing a traveling speed lower than a working traveling position in a paddy field in the traveling transmission,
Pushing down on the shifting device moves the transmission for traveling from the work travel position to the low-speed position, allowing traversing ridges and loading / unloading trucks. Is operated from the low speed position to the work traveling position.

According to the fourth aspect of the present invention, the speed change operation tool is disposed below the steering handle for steering operation (in the recess of the hood below the steering handle for steering operation). Even if the driver holds the steering handle for steering operation with both hands, for example, the transmission operation device is operated from the work traveling position to the low speed position by stepping on the transmission operating device with the foot and pushing downward. Can be. If the operator has a margin, the transmission can be operated from the work traveling position to the low-speed position by holding down the shifting operation tool and pushing it down.

In this case, according to the fourth aspect of the present invention, since the speed change operation tool is disposed in the recess of the bonnet disposed below the steering handle for steering operation, the speed change operation tool is in the range of the hood. It does not come to the state that it protrudes largely outward from. Thus, even if the speed change operation tool is disposed below the steering handle for steering operation (in the recess of the bonnet below the steering operation handle for steering operation), the speed change operation tool does not obstruct the driver. It is rare.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [1] As shown in FIG. 1, a pair of left and right front wheels 1 and a pair of right and left rear wheels 2 that can be steered left and right.
A steering unit 3 is formed on the body supported by the vehicle, and a seedling planting device 5 is connected to a rear portion of the body by a link mechanism 4 so as to be able to move up and down, so that a four-wheel drive riding type rice planting which is an example of a paddy field work vehicle is provided. Machine is configured.

Next, the structure of the traveling power transmission system will be described. As shown in FIGS. 1 and 4, the engine 6
A transmission case 7 is provided on the rear side of the engine 6. The power of the engine 6 is transmitted via a split pulley type belt-type continuously variable transmission 8 and a friction multi-plate type main clutch 9. 7 is transmitted to the input shaft 10. As shown in FIG. 4, a first transmission shaft 11 and a second transmission shaft 12 are arranged with respect to the input shaft 10, and the first shift gear 13 is integrally rotatably and slidably attached to the first transmission shaft 11 by a spline structure. It is fitted. In the state shown in FIG. 4, the first shift gear 13 is the first gear 10a of the input shaft 10.
It is in a state where it has been slid to the standard position where it engages with
The power of the input shaft 10 is transmitted to the first transmission shaft 11 via the first gear 10a and the first shift gear 13.

A first high-speed gear 14 is rotatably fitted on the first transmission shaft 11 and a second high-speed gear 14 is rotatably fitted on the second gear 10b and the second transmission shaft 12 of the input shaft 10. The second shift gear 16 is externally engaged with the second transmission shaft 12 by a spline structure so as to be integrally rotatable and slidable.

In the state shown in FIG. 4, the first shift gear 13 is slid to the standard position where it meshes with the first gear 10a of the input shaft 10, and the second shift gear 16 meshes with the low speed gear 11a of the first transmission shaft 11. This is a state where the slide operation is performed to the planting position. In this state, the power of the input shaft 10 is transmitted to the second transmission shaft 1 via the first gear 10a, the first shift gear 13, the low speed gear 11a of the first transmission shaft 11, and the second shift gear 16.
2 is transmitted to the front wheel 1 and the rear wheel 2 via the second transmission shaft 12. The power of the first transmission shaft 11 is
It is transmitted to the seedling planting device 5 via the inter-plant transmission 17. In this state, it is possible to obtain a planting traveling speed for traveling while planting the seedlings in the paddy field.

From the state shown in FIG.
When the second shift gear 16 is slid to a movement position where it engages with the boss of the second high-speed gear 15 while leaving the second shift gear 16 at the standard position where it engages with the first gear 10a of the input shaft 10, the input shaft 10
Is transmitted via the second gear 10b, the first high-speed gear 14, the second high-speed gear 15, and the second shift gear 16 to the second transmission shaft 1
2 is transmitted to the front wheel 1 and the rear wheel 2 via the second transmission shaft 12. In this state, it is possible to obtain a high-speed traveling speed that travels at a higher speed than the planting traveling speed, such as traveling on a road.

From the state shown in FIG.
When the second shift gear 16 is slid to the reverse position where the second shift gear 16 is engaged with the reverse gear pair 18 while the power of the input shaft 10 is kept at the standard position where the input gear 10 is engaged with the first gear 10a, the power of the input shaft 10 Shift gear 13, reverse gear 11b of first transmission shaft 11, reverse gear pair 18, and second shift gear 1
6 is transmitted to the second transmission shaft 12 via the second transmission shaft 1.
2 to the front wheel 1 and the rear wheel 2. In this state, the aircraft can be moved backward.

[2] Next, the slide operation structure of the second shift gear 16 will be described. As shown in FIG. 4, the shift shaft 19 is rotatably (not slidable in the axial direction) supported by the transmission case 7, and the second shift gear 1
The second shift fork 22 that engages with the gear 6 is slidably fitted on the shift shaft 19. An operation arm 20 is swingably supported around an axis (not shown) of the transmission case 7, the operation arm 20 is engaged with the second shift fork 22, and a main transmission provided in the control unit 3 is provided. Lever 23
(See FIG. 1) and the operation arm 20 are mechanically linked.

Thus, the operation arm 20 is swung by the main shift lever 23, and the second shift gear 16 is moved through the second shift fork 22 to the moving position, the planting position and the reverse position described in the above item [1]. Operate the slide. The second shift fork 22 is provided with a detent ball 22a,
Four shift grooves 19 a are formed in the shift shaft 19, and the detent balls 22 of the second shift fork 22 are formed.
The second shift gear 16 and the second shift fork 22 are held at the moving position, the planting position, the neutral position between the planting position and the reverse position, and the reverse position, as a enters the positioning groove 19a of the shift shaft 19. Is done.

[3] Next, the slide operation structure of the first shift gear 13 will be described. As shown in FIG.
A first shift fork 21 engaged with the shift gear 13 is slidably fitted on the shift shaft 19. A cam portion 21a is formed on the boss portion of the first shift fork 21, and the operation pin 24 is fixed to the shift shaft 19 so as to penetrate in the diameter direction. A spring 25 is provided which is in contact with the portion 21 a and biases the first shift fork 21 toward the operation pin 24 of the shift shaft 19.

As shown in FIGS. 1 and 2, an openable hood 36 for covering the engine 6 is provided.
6, a power steering mechanism (not shown) of the steering handle 38 and a rear bonnet 37 for covering a fuel tank (not shown) are provided below the steering handle 38 for performing the steering operation of the front wheel 1 on the rear side. ing. Concave portions 37a are formed on the right and left sides on the rear side of the rear bonnet 37. A clutch pedal 35 for operating the main clutch 9 (see FIG. 4) on the transmission side and the transmission cutoff side is provided in the concave portion 37a on the left side of the rear bonnet 37. A front wheel differential lock pedal 39 for locking a front wheel differential device (not shown) of the front wheel 1 is arranged, and a right side brake pedal 33R and a left side brake pedal 33L are arranged in a concave portion 37a on the right side of the rear bonnet 37. .

As shown in FIGS. 3 and 4, the shift shaft 19 protrudes from the transmission case 7 so as to be located below the concave portion 37a on the right side of the rear bonnet 37, and an arm 19b at the end of the shift shaft 19 is provided. The ridge-over lever 26 is connected to the ridge-over lever 2 as shown in FIGS.
6 extend upward and are located in the concave portion 37 a on the right side of the rear bonnet 37. Thereby, the ridge over lever 26
By pushing down and pulling up,
The shift shaft 19 is rotated in a range of a predetermined angle (for example, about 90 °).

The state shown in FIGS.
6 is operated to the standard position, and the shift shaft 19
Operating pin 24 of the cam portion 21 of the first shift fork 21
In this state, the first shift gear 13 is slid to the standard position where the first shift gear 13 engages with the first gear 10a of the input shaft 10 against the spring 25 in contact with the input shaft 10 (see [1] above). In this state, the pilot sitting on the cockpit 31 (see FIG. 1)
Hold the grip portion 26a of the ridge-over lever 26 with your right hand and push the ridge-over lever 26 downward, or
The operator seated at 1 steps on the grip 26a of the ridge crossing lever 26 with his right foot and pushes the ridge crossing lever 26 downward to operate the ridge crossing position. As a result, the shift shaft 19 is rotated by a predetermined angle, and the first shift fork 21 is rotated by the contact between the operation pin 24 of the shift shaft 19 and the cam portion 21a of the first shift fork 21 and the urging force of the spring 25. Is slid to the operation pin 24 side of the shift shaft 19, and the first shift fork 21 is slid to the position beyond the furrow where the first shift gear 13 engages the side surface of the first high-speed gear 14.

As described above, the first shift gear 13 is connected to the input shaft 1
0 and engages the side surface of the first high-speed gear 14 away from the first gear 10a, the power of the input shaft 10 is transmitted to the first transmission shaft 11 via the second gear 10b and the first high-speed gear 14. As described in the preceding item [1], the power of the input shaft 10 is transmitted from the input shaft 10 to the lower speed than the power transmitted to the first transmission shaft 11 via the first gear 10a and the first shift gear 13. The power is transmitted to one transmission shaft 11. Next, when the ridge crossing lever 26 is operated to the standard position, the grip portion 26a of the ridge crossing lever 26 is held with the right hand and the ridge crossing lever 26 is pulled upward to operate the lever 26 at the standard position.

As described above, the second shift gear 16 is moved as described in [1] and [2] in a state where the first shift gear 13 is slid to the position beyond the ridge where it engages with the side surface of the first high-speed gear 14. The slide operation can be performed to the position, the planting position, and the reverse position. In this case, the first shift gear 1
3 is lower than the standard position of the first shift gear 13 and the moving position of the second shift gear 16, and the speed at the moving position of the second shift gear 16 is lower than that of the first shift gear 13.
The speed is higher than the standard position and the planting position of the second shift gear 16. The speed of the first shift gear 13 at the position beyond the ridge and at the planting position of the second shift gear 16 is the first shift gear 1
3 is lower than the standard position and the planting position of the second shift gear 16,
The speed at the reverse position of the shift gear 16 is lower than the standard position of the first shift gear 13 and the reverse position of the second shift gear 16.

[4] Next, the speed change operation structure of the belt type continuously variable transmission 8 will be described. As shown in FIGS. 1 and 5, a continuously variable transmission lever 27 is provided on the right side of the control handle 38 in the control section 3, and a detection value of a position sensor 28 that detects an operation position of the continuously variable transmission lever 27 is controlled. Device 2
9 is provided with an operating cylinder 30 for operating the belt-type continuously variable transmission 8. By operating the continuously variable transmission lever 27 between the highest speed position and the lowest speed position, the control device 29 and the operating cylinder 30 are shifted to the transmission position corresponding to the operation position of the continuously variable transmission lever 27.
As a result, the belt-type continuously variable transmission 8 is operated.

[5] As shown in FIGS. 3 and 6, the governor lever 3 of the governor (not shown) provided in the engine 6
4 (accelerator position) is swingably supported around the horizontal axis P1, and the carburetor 41 and the governor lever 34 (accelerator position) are connected by a link rod 42. An accelerator arm 43 is swingably supported around the horizontal axis P2, and the accelerator arm 43 and the governor lever 34 (accelerator position) are connected via a spring 44. A stopper 45 for stopping the accelerator arm 43 at the highest speed position. And a stopper 46 for stopping at the lowest speed position, an accelerator arm 43
A spring 49 for urging the actuator toward the lowest speed position is provided.

As shown in FIGS. 1, 3, and 6, a hand accelerator lever 50 is provided so as to be aligned with the continuously variable transmission lever 27 on the right side of the control handle 38 in the control section 3, and holds the hand accelerator lever. A friction holding mechanism 51 is provided, and one end of an inner 48 a of the wire 48 is connected to the hand accelerator lever 50. A plate-like operation portion 43a is formed by bending the accelerator arm 43, a pair of upper and lower openings are formed in the operation portion 43a of the accelerator arm 43, and the other end of the inner 48a of the wire 48 is operated by the accelerator arm 43. The contact portion 52 is attached to the other end of the inner 48a of the wire 48 by being inserted into the lower opening of the portion 43a.

As shown in FIGS.
Is fixed to an end of the operation plate 19c.
ridge over sensor 32 of limit switch type for c
Is arranged. Accordingly, when the ridge-over lever 26 is operated from the standard position to the ridge-over position, the operation plate 19c of the shift shaft 19 comes into contact with the ridge-over sensor 32 with the rotation of the shift shaft 19, and the ridge-over sensor 32 The detection signal is input to the control device 29. As shown in FIGS. 3 and 6, one end of the inner 40 a of the wire 40 is connected to the arm 19 b of the shift shaft 19, and the inner
The other end of “a” is connected to the contact portion 52.

As shown in FIGS. 1, 2, 3 and 6, an accelerator pedal 54 is disposed in the steering section 3 on the outside of the right side brake pedal 33R.
One end of “a” is connected to the accelerator pedal 54, and the accelerator pedal 54 is urged to the return side by a spring (not shown). The other end of the inner 47a of the wire 47 is inserted into the upper opening of the operation portion 43a of the accelerator arm 43, and the contact portion 53 is attached to the other end of the inner 47a of the wire 47.

With the above structure, the accelerator arm 43 and the governor lever 34 (accelerator position) are operated by the hand accelerator lever 50 during the planting run in the paddy field.
The accelerator pedal 54 is rarely depressed, and the driver often depresses the accelerator pedal 54 to operate the accelerator arm 43 and the governor lever 34 (accelerator position) when traveling on the road. Thus, when the hand accelerator lever 50 is operated to the high speed side, the inner 48a of the wire 48 is pulled toward the hand accelerator lever 50 side, and the contact arm 52 moves the accelerator arm 43 and the governor lever 34 (accelerator position) to the high speed side. Operated. When the hand accelerator lever 50 is operated to the low speed side,
The inner 48a of the wire 48 is returned to the accelerator arm 43 side, the inner 40a of the wire 40 is loosened, and the spring 4
With 9, the accelerator arm 43 and the governor lever 34 (accelerator position) are operated to the lower speed side.

As described above, the hand accelerator lever 50
Even if the user releases his / her hand after operating to the desired operating position, the frictional holding mechanism 51 holds the hand accelerator lever 50 at that operating position. Even if the accelerator arm 43 and the governor lever 34 (accelerator position) are operated by the hand accelerator lever 50, the operation unit 43 of the accelerator arm 43
Only the “a” moves relatively to the inner 47 a of the wire 47, and the accelerator pedal 54 is not operated.

When the accelerator arm 43 and the governor lever 34 (accelerator position) are set to desired operation positions by the hand accelerator lever 50, the accelerator pedal 5
When the step 4 is depressed, the inner 47 a of the wire 47 is pulled toward the accelerator pedal 54, and the contact portion 53 moves the accelerator arm 43 and the governor lever 34 (accelerator position) to the high-speed side. In this case, only the operation portion 43a of the accelerator arm 43 moves relatively to the inner 48a of the wire 48, and the hand accelerator lever 50 is not operated. Next, when the foot is released from the accelerator pedal 54 and returned, the accelerator arm 43 and the governor lever 34 (accelerator position) return to the original operation position (the operation position set by the hand accelerator lever 50) by the spring 49.

[6] Next, the operation of each part when the ridge crossing lever 26 is operated from the standard position to the ridge crossing position will be described. In the state shown in FIG. 6, the ridge-over lever 26 is operated to the standard position, and the accelerator arm 43 and the governor lever 34 (accelerator position) are operated by the hand accelerator lever 50.
Is operated at the highest speed position, and the accelerator pedal 54 is not depressed.

As a result, when the ridge crossing lever 26 is operated from the standard position to the ridge crossing position, as shown in FIGS.
7, the contact portion 52 moves to the left in the drawing of FIG. 7, and the accelerator arm 43 and the governor lever 34 (accelerator position) are automatically moved from the highest speed position to a predetermined low speed position (for example, by the spring 49). The number of revolutions of the engine 6 is 2500
rpm). In this case, the inner 48a of the wire 48 is pulled toward the accelerator arm 43, and the hand accelerator lever 50 is operated from the highest speed position to a predetermined low speed position. In the inner 47a of the wire 47, the operating section 43 of the accelerator arm 43
Only the “a” moves relatively to the inner 47 a of the wire 47, and the accelerator pedal 54 is not operated.

When the over-ridge lever 26 is operated from the standard position to the over-ridge position as described above, the shift shaft 1 shown in FIG.
The operation plate 19c of FIG. 9 comes into contact with the ridge-over sensor 32, a detection signal of the ridge-over sensor 32 is input to the control device 29, and the belt-type continuously variable transmission 8 is automatically turned down by the operation cylinder 30 shown in FIG. Operated to the fast position. In this case, the continuously variable transmission lever 27 is left at the operation position before the belt-type continuously variable transmission 8 is automatically operated to the lowest speed position. In this way, the ridge-over lever 26 is operated from the standard position to the ridge-over position (the ridge-over position where the first shift gear 13 shown in FIG. 4 engages the side surface of the first high-speed gear 14), and the accelerator arm 43 and the governor lever 34 ( The accelerator position (accelerator position) is operated at a predetermined low-speed position, and the belt-type continuously variable transmission 8 is operated at the lowest speed position, while moving forward or backward, moving over ridges and loading / unloading trucks onto / from the loading platform.

As shown in FIG. 7, the ridge-over lever 26 is operated from the standard position to the ridge-over position, and the accelerator arm 43 is moved.
When the accelerator pedal 54 is depressed as shown in FIG. 8 in a state where the governor lever 34 (accelerator position) is operated to the predetermined low-speed position, the inner 47a of the wire 47 is pulled toward the accelerator pedal 54, and the spring 4
9, the accelerator arm 43 and the governor lever 34 (accelerator position) are operated from a predetermined low speed position to a high speed side by the contact portion 53. Thereafter, when the foot is released from the accelerator pedal 54 and returned, the spring 4 is released as shown in FIGS.
9, the accelerator arm 43 and the governor lever 34
(Accelerator position) returns to the predetermined low-speed position. in this case,
Even when the accelerator arm 43 and the governor lever 34 (accelerator position) are operated by the accelerator pedal 54, the operating section 43a of the accelerator arm 43 is connected to the inner 4
The hand accelerator lever 50 is not operated only by relatively moving with respect to 8a.

After the crossing of the ridges and the loading and unloading of the truck onto the loading platform are completed as described above, when the ridge crossing lever 26 is operated from the ridge crossing position to the standard position, the wire 40 is moved in the state shown in FIG. The inner 40a is returned to the accelerator arm 43 side, but only by loosening the inner 40a of the wire 40, the accelerator arm 43, the governor lever 34 (accelerator position), and the hand accelerator lever 50 move to the predetermined low-speed position shown in FIG. Will be left. Thereafter, as shown in FIG. 6, the accelerator arm 43 and the governor lever 34 (accelerator position) may be operated to the highest speed position by the hand accelerator lever 50.

As shown in FIG. 6, when the lever 26 is operated to the standard position and the accelerator arm 43 and the governor lever 34 (accelerator position) are operated to the highest speed position by the hand accelerator lever 50, the accelerator pedal is operated. Assume that the operator has depressed the pedal 54 to the highest speed position (in FIG. 6, the inner part 47 a of the wire 47 is pulled toward the accelerator pedal 54, and the contact part 53 contacts the operation part 43 a of the accelerator arm 43. State). In the above-mentioned state, even if the ridge-over lever 26 is operated from the standard position to the ridge-over position, and the inner 40a of the wire 40 is pulled toward the ridge-over lever 26, the contact portion 53 is operated by the operating portion 43a of the accelerator arm 43. The accelerator arm 43 and the governor lever 34 (accelerator position)
It is left at the highest speed position without being operated at the predetermined low speed position.

[Another Embodiment of the Invention] In the configuration shown in FIG. 1 and FIG.
a ridge-over lever 26,
May be set to the rearward instead of the frontward. The grip portion 26a of the ridge-crossing lever 26 may be configured in a tread surface shape such as the clutch pedal 35, and the ridge-crossing lever 26 may be configured in a pedal shape. In the right or left concave portion 37a of the rear bonnet 37, the ridge-over lever 26 extends rearward or laterally outward from the vertical wall portion of the rear bonnet 37.
May be arranged so as to protrude, and the ridge-over lever 26 may be configured to be swingable up and down. A concave portion 37a may be formed in the left and right center of the rear bonnet 37, and the ridge-over lever 26 as described above may be arranged in the concave portion 37a.

The inner 40a of the wire 40 shown in FIG. 3 may be connected directly to the carburetor 41 instead of the accelerator arm 43. Wire 4 shown in FIG.
When the ridge-over lever 26 is operated from the standard position to the ridge-over position, the accelerator arm 43 and the governor lever 34 (accelerator position) and the carburetor 41 are moved to a predetermined low-speed position by an electric cylinder (not shown). May be configured to be operated.

[0047]

According to the first aspect of the present invention, there is provided a paddy field work vehicle provided with a low speed position for producing a running speed lower than the work traveling position in the paddy field in the traveling speed change device. When the device is operated to the low speed position, the accelerator position of the engine is automatically operated to the low speed side in conjunction with this, and the engine speed is reduced, so that the ridge crossing and truck bed Loading and unloading can be performed stably at a sufficiently low speed,
The traveling performance and handleability of the paddy field work vehicle were improved. As in the feature of claim 1, if the engine speed is reduced (to the extent that the engine does not stop),
Since the torque of the power transmitted to the traveling power transmission system can be suppressed, the durability of the traveling power transmission system is also advantageous.

According to the first aspect of the present invention, even when the traveling transmission is operated at the low speed position and the engine speed is reduced, the accelerator position of the engine is artificially increased by the artificial accelerator operation tool. Since the vehicle can be operated to the side, the aircraft can be temporarily moved a little faster, and the traveling performance and handleability of the paddy field working vehicle can be improved.

According to the feature of the second aspect, the "effect of the invention" of the first aspect is provided similarly to the case of the first aspect, and in addition to the "effect of the invention", the following "invention" is provided. Of the effect. According to the feature of claim 2, since the artificial accelerator operation tool is constituted by the accelerator pedal, the operator can depress the accelerator pedal without releasing both hands from the steering handle for steering operation, etc. The accelerator position of the engine can be easily and artificially operated to the high-speed side, and the operability of the paddy field working vehicle has been improved.

According to a third aspect of the present invention, in a paddy field working vehicle provided with a low speed position for producing a running speed lower than a work traveling position in a paddy field, the traveling transmission is provided. When the engine is moved to the low-speed position, the accelerator position of the engine and the hand accelerator lever are automatically operated to the low-speed side in conjunction with this, and the engine speed is reduced. Can be stably loaded and unloaded at a sufficiently low speed, and the traveling performance and handleability of the paddy field working vehicle can be improved. According to the third aspect of the invention, if the number of revolutions of the engine is reduced (to the extent that the engine does not stop), the torque of the power transmitted to the traveling power transmission system can be suppressed, so that the durability of the traveling power transmission system can be reduced. It was also advantageous in terms of sex.

According to the third aspect of the present invention, when the traveling transmission is operated to the low speed position, the accelerator position of the engine is automatically operated to the low speed side, and the hand accelerator lever is also automatically operated. The driver is in the current state because the engine is operated to the lower speed side (the state in which the accelerator position of the engine is automatically operated to the lower speed side as the traveling transmission is operated to the lower speed position). Can be recognized, and the pilot's misunderstanding can be avoided.
According to the feature of claim 3, an accelerator pedal is provided separately from the hand accelerator lever, and the accelerator position of the engine can be artificially operated to a high speed side by depressing the accelerator pedal. Therefore, the present invention has the “effect of the invention” according to claims 1 and 2 relating to the aforementioned artificial accelerator operation tool and accelerator pedal.

According to a fourth aspect of the present invention, in a paddy field working vehicle provided with a low speed position for producing a running speed lower than a work running position in a paddy field in a traveling transmission, a driver can perform, for example, a steering operation. Even if you hold the steering wheel for both hands, step on the gearshift operation tool with your foot and push it down,
The operability of the paddy field working vehicle could be improved by configuring the traveling transmission so that it could be operated to the low-speed position. According to the characteristic of claim 4, the speed change operation tool is arranged in the recess of the bonnet arranged below the steering handle for steering operation, and the speed change operation tool may disturb the driver. Because there are few, it became good workability.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a perspective view of the vicinity of a rear bonnet in a control section as viewed obliquely from above and behind.

FIG. 3 is a diagram showing a linked state between an accelerator arm and a governor lever (accelerator position) of an engine and a ridge-crossing lever.

FIG. 4 is a cross-sectional plan view of a transmission case.

FIG. 5 is a block diagram showing a linked state of a control system;

FIG. 6 shows a state in which the ridge crossing lever is operated to the standard position and the hand accelerator lever is operated to the highest speed position.
Diagram showing the state of the accelerator arm of the engine

FIG. 7 is a view showing a state of an accelerator arm of the engine in a state where the ridge over lever is operated to a ridge over position from the state shown in FIG. 6;

FIG. 8 is a diagram showing a state of an accelerator arm of the engine when the accelerator pedal is depressed from the state shown in FIG. 7;

[Explanation of symbols]

 Reference Signs List 6 engine 26 shift operation tool 38 steering handle 37 bonnet 37a recess of bonnet 40 accelerator down means 50 accelerator lever 54 artificial accelerator operation tool, accelerator pedal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B60K 28/04 B60K 28/04 3D052 28/10 28/10 Z 3G065 B62D 11/08 B62D 11/08 X 3J067 D 3J070 E F02D 11/02 F02D 11/02 F 11/04 11/04 GN F16H 61/26 F16H 61/26 63/04 63/04 G05G 9/00 G05G 9/00 A (72) Inventor Hiroaki Kitai 64 Ishizukita-cho, Sakai-shi, Osaka F-term in Kubota Sakai Works Co., Ltd. (reference) EA03 EB01 EB02 EB03 EB12 EC00 FA27 FB01 3D040 AA22 AA28 AB04 AC29 AD04 AD12 AE19 AF05 AF07 3D052 AA16 BB01 BB02 BB03 BB05 DD03 EE02 EE03 FF01 FF0 3 JJ00 JJ03 JJ09 JJ17 JJ22 JJ31 3G065 BA04 CA22 DA14 DA15 EA11 EA12 GA46 JA02 JA04 JA09 JA11 KA05 KA29 3J067 AA01 AB01 AC07 AC23 AC53 BA02 BA03 BB04 CA31 FB61 GA14 3J070 AA03 BA34 CC24 DA24 EA12

Claims (4)

[Claims] The present invention provides a low-speed position for producing a traveling speed lower than a work traveling position in a paddy field in a traveling transmission, and when the traveling transmission is operated to a low-speed position, An accelerator-down means for operating the accelerator position of the engine to a low speed side in conjunction with the engine, and in a state where the accelerator position of the engine is operated to the low-speed side by the accelerator-down means, the accelerator position of the engine is artificially moved to a high-speed side. The traveling speed change structure of a paddy working vehicle equipped with a manually operated accelerator operation tool that can be freely operated. 2. The traveling speed change structure of a paddy working vehicle according to claim 1, wherein the artificial accelerator operation tool is an accelerator pedal. 3. A low-speed position for producing a traveling speed lower than a work traveling position in a paddy field is provided in a transmission for traveling, and an accelerator position of an engine can be artificially set to a high-speed side and a low-speed side. When the traveling transmission is operated at a low speed position, the vehicle further includes accelerator down means for operating the accelerator position of the engine and the hand accelerator lever to a low speed side in conjunction therewith, In a state where the accelerator position of the engine and the hand accelerator lever are operated to the low speed side by the accelerator down means, the traveling speed of the paddy working vehicle provided with the accelerator pedal which can be manually operated to the accelerator position of the engine to the high speed side. Construction. 4. A traveling transmission device is provided with a low-speed position for producing a traveling speed lower than a work traveling position in a paddy field, and the traveling transmission device is moved to a low-speed position by a downward push operation. A shift operation tool for operating and operating the transmission for traveling to a work traveling position by pulling upward; forming a recess in a hood disposed below a steering handle for steering operation; A traveling speed change structure for a paddy field working vehicle, wherein the speed change operation tool is disposed in a recess of the hood.