JPH0516689A - Differential locking device for agricultural vehicle - Google Patents

Abstract

PURPOSE:To associate the control lever of a differential locking device with the control of a main speed change lever, in an agricultural vehicle suitable for use in a passenger type rice planting machine such as an agricultural four- wheel drive tractor. CONSTITUTION:In an agricultural vehicle having pairs of right and left front and rear wheels driven via respective differential gears and a differential locking device provided to the differential gear of the rear wheels, a diff-lock lever 18 for switching on and off the differential locking device 28 is disposed near a main speed change lever 15 provided to a handle post 10 and both of the levers 15, 18 are associated with each other in such a manner that when the main speed change lever 15 is shifted to its 'high speed' position the diff-lock lever 18 is set to its 'off' position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diff lock device for an agricultural traveling vehicle such as an agricultural four-wheel drive tractor.

[0002]

2. Description of the Related Art Conventionally, an agricultural traveling vehicle such as an agricultural four-wheel drive tractor has a pair of left and right front wheels and rear wheels, and the front wheels and the rear wheels are each driven by a differential device. There is known a differential device having a side clutch and a diff lock device. The operating device for operating the differential lock device is arranged to be operated independently.

[0003]

Since the diff lock operating device is operated independently, the diff lock device is set to the "on" state while the agricultural traveling vehicle is traveling on the road at a high traveling speed. If it were, the turning performance would be poor and it was dangerous. The present invention has been made to solve the above problems.

[0004]

In order to achieve the above object, the present invention has a pair of left and right front wheels and rear wheels, and the front wheels and the rear wheels are respectively driven through a differential device, and In an agricultural vehicle equipped with a diff lock device on a wheel differential device, a diff lock lever for operating "on" and "off" of the diff lock device is arranged near a main gear shift lever provided on a handle post, The feature is that both levers are interlocked so that the diff lock lever is in the "cut" position when the lever is shifted to the "high speed" position.

[0005]

With the above construction, the diff lock device for an agricultural traveling vehicle according to the present invention automatically turns the diff lock lever to the "off" position when the main transmission lever is shifted to the "high speed" position. It does not get worse,
Danger is eliminated. Further, since the differential lock lever is provided near the handle post, operability is good.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. In FIG. 5 and FIG. 6, the riding type rice transplanter 1 is equipped with a seedling planting device 4 similar to a conventionally known one which can be lifted up and down via a lifting link 3 at the rear of a four-wheel drive type agricultural traveling vehicle 2. ing. Further, a fertilizer application device 5 is arranged at a rear position of the passenger vehicle body 2 between the agricultural traveling vehicle 2 and the seedling planting device 4. Then, the power is transmitted from the passenger car body 2 to the seedling planting device 4 and the fertilizer application device 5, and in the seedling planting device 4, multiple rows (6 rows in the drawing) of seedlings are planted in the field, and the seedlings are planted. The fertilizer fed by the fertilizer application device 5 is applied between the rows of seedlings.

The agricultural traveling vehicle 2 has a pair of left and right front wheels 6 and rear wheels 7, an engine 8 is mounted in the substantial center of the vehicle body, and a driver's seat 9 is provided above the engine 8.
A steering handle 11 is provided on a handle post 10 in front of the driver's seat 9, and a mission case 12 shown in detail in FIG. 2 is provided below the handle post 10 and below the vehicle body. Engine 8 to mission case 12
A belt transmission system 13 having a tension clutch 13a and a continuously variable transmission belt transmission system 14 are provided in a power transmission path to the. On the handle post 10,
As shown in FIG. 1, a main gear shift lever 15 that can be switched between “high speed” and “low speed”, an auxiliary gear shift lever 16 that shifts the continuously variable transmission belt transmission system 14, and a main gear shift lever 15 are provided in the vicinity of the gear shift lever 15. , Move in the shift groove 17 and "enter",
The differential lock lever 18 that is operated to “turn off” is provided on the rotating portion of the main speed change lever 15, and when the main speed change lever 15 is shifted to the “high speed” position, the differential lock lever 18 is interlocked so as to be at the “off” position. An interlocking arm 19 is provided.

The transmission case 12 receives rotational power from a continuously variable transmission belt transmission system 14 via a main clutch 20, and a main transmission portion 21 which can be switched between "high speed" and "low speed" by the main transmission lever 15. And this main transmission unit 2
1 is connected to the seedling planting device 4 via the transmission shaft 22a to transmit power to the seedling planting device 4, and is connected to the seedling planting device transmission unit 22 that can be switched between "high speed" and "low speed", and the main transmission unit 21 to connect the front wheels 6 and the rear wheels. A front wheel differential device 24 and a rear wheel differential device 25 for driving the wheels 7 are provided, and the rear wheel differential device 25 is provided with side clutches 23, 23.

The front-wheel drive shafts 26, 26 extending from the front-wheel differential device 24 to the left and right are formed by the front axle 2.
The front wheels 6 and 6 are connected to the wheels 7 and 27. The rear wheel differential device 25 includes a differential lock device 2 operated by the differential lock lever 18.
8 is provided, and brake devices 30, 30 are provided at the side end portions of the rotary shafts 29, 29 extending left and right from the rear wheel differential device 25. The rotating shaft 29,2
9, rear wheel drive shafts 31, 31 extending rearward through the bevel gear device and orthogonal to the rotary shafts 29, 29 and projecting outward from the transmission case 12 are provided. In the middle of 31, the side clutches 23, 2
3 is provided. Left and right side clutches 23, 23
And the left and right brake devices 30, 30 are connected so as to be operated in conjunction with each other. Rear wheel drive shaft 31,3
In the protruding portion of the transmission case 1 of No. 1 through the universal joints 32, 32, the transmission shaft 3
3, 33 are connected to one end, and the other ends of the transmission shafts 33, 33 are connected to rear wheel drive cases 34, 34 to rotate the rear wheels 7, 7 rotatably supported by the rear wheel drive cases 34, 34. I am trying. Reference numeral 35 is a clutch pedal for operating the main clutch 20, and 36 is the tension clutch 13
a is a starting clutch pedal that is operated when the engine is started,
Reference numeral 37 is a brake pedal that allows the brake devices 30 and 30 to be operated separately.

As shown in FIG. 3 and FIG. 4, the support stay 38 is provided in the handle post 10 so as to stand upright with a slight rearward inclination.
The steering shaft 11a of the steering handle 11 is aligned with the rear portion of the power steering torque generator 11
The front wheel 6 is steered by being connected to and supported by b, the lower end of which is connected to the front axle 27. The main shift lever 15 has a main shift operating rod 15
a is connected to each other, and by rotating the main transmission lever 15 in the front-rear direction, the operation portion of the main transmission portion 21 is switched between two stages of "high speed" and "low speed". The auxiliary shift lever 16 includes the auxiliary shift operation lever 16
a and 16a are connected to each other, and the auxiliary shift lever 16 is rotated in the front-rear direction, so that the auxiliary shift operation lever 16
via a and 16a, the moving pulleys of both pulleys of the continuously variable transmission belt transmission system 14 are relatively moved in the axial direction by a cam so that the effective diameter of the pulleys is relatively changed to continuously change the speed. There is.

The clutch pedal 35 is provided on the support stay 3
8 is pivotally supported on the upper front side, and a clutch operating rod 35a is linked to this pivotal position. When the clutch pedal 35 is depressed, the main clutch 20 is disengaged, and when the clutch pedal 35 is released, the spring is released. By this action, the clutch pedal 35 is returned, and the main clutch 20 is in the "engaged" state. The starting clutch pedal 3
6 is linked to the tension clutch 13a, and when the starting clutch pedal 36 is depressed when starting the engine 8, the tension clutch 13a is in the "disengaged" state, and when the depression of the starting clutch pedal 36 is released, the spring 13b Due to the action, the tension clutch 13a is in the "engaged" state.

The left and right brake pedals 37, 37 are provided close to each other so that the left and right brake pedals can be depressed simultaneously or separately. The right brake pedal 37 has a right brake operating rod 37a. , The left brake operating rod 37b is connected to the left brake pedal 37, and the left and right brake devices 30, 3 are connected.
I am trying to operate 0. And while the aircraft is running,
When stopping the traveling, at the same time, the brake pedal 3
When stepping on 7, 37, the left and right brake devices 30, 30
Is activated and the left and right rear wheels 7, 7 are braked, and the side clutches 23, 23 are in the “disengaged” state, and the traveling of the aircraft is stopped. Before stopping the traveling of the airframe, the clutch pedal 35 is depressed to put the main clutch 20 into the "disengaged" state, and the power from the engine 8 to the transmission case 12 is disconnected.

Further, when turning the vehicle while the vehicle is traveling,
By depressing the brake pedal 37 on the turning side, the brake device 30 and the side clutch 23 on that side are depressed.
Is activated to stop the driving of one rear wheel 7, and only the opposite rear wheel 7 is driven and rotated, so that the vehicle body can turn with a small radius as the steering wheel 11 is operated. When straight traveling of the aircraft is required like rice transplanting work,
The diff lock device 2 is operated by the diff lock lever 18 during work.
By setting "8" to "on", the rear wheel differential device 25 is locked and the rear wheels 7, 7 do not make a differential in the turning motion,
The straight running performance of the aircraft is improved. During the field work, the main transmission lever 15 is shifted to "low speed", the machine is traveling at low speed, the main transmission lever 15 is shifted to "high speed", and the diff lock lever is moved via the interlocking arm 19. 18 is not moved to the "cut" position. It is necessary to move the diff lock lever 18 to the "cut" position when the aircraft makes headland turning during field work, but when the turning angle of the steering handle 11 is turned largely beyond a predetermined angle, its operation is performed. It is also possible to provide a mechanism for releasing the diff lock in conjunction with.

As shown in FIGS. 7 to 9, the side clutch 23 has an opening 4 in the clutch housing 39.
0, the clutch plate insertion hole 41, the clutch plate sliding hole 42, and the rotary shaft insertion hole 43 are provided so that the clutch plate 44 can be taken in and out. The clutch plate 44 has a rotary shaft insertion hole 45,
The clutch housing 39 having the sliding protrusions 46, 46.
It is inserted from the opening portion 40 through the clutch plate insertion hole 41, the sliding protrusions 46, 46 are fitted into the clutch plate sliding hole 42, and are alternately arranged with the clutch plate fixed on the rotating shaft side. The multi-plate clutch. With such a configuration, the side clutch 23 can be easily assembled and disassembled, and replacement work when the clutch plate 44 is worn can be performed easily.
It can be done easily and in a short time. In addition, since the entire structure is simplified, the cost is reduced.

The riding type rice transplanter 1 according to one embodiment of the present invention thus constructed is introduced into a paddy field and the agricultural traveling vehicle 2 is driven to lower the seedling planting device 4 by the elevating link 3. The seedling planting device 4 is slid in a state where the float provided below the seedling planting device 4 is in contact with the paddy field, and the seedling planting device 4 and the fertilizer application device 5 are driven by the power transmitted from the agricultural traveling vehicle 2 via the transmission shaft 22a. Driven, 6 seedlings of seedlings are planted in the field at predetermined intervals in the seedling planting device 4,
The fertilizer fed by the fertilizer application device 5 is applied to the spaces between the planted seedlings. During such seedling planting work, the main gear shift lever 15 is shifted to "low speed", and the sub gear shift lever 16 performs a sub gear shift to select an appropriate traveling speed for seedling planting work. The vehicle is driven at a considerably low speed, and is diff-locked by the diff lock lever 18 when traveling straight ahead. Therefore, the main shift lever 15 is shifted to "high speed", and the interlocking arm 1
The diff lock lever 18 is not moved to the "cut" position via 9.

When the machine is traveling on the road, the main transmission lever 15 is shifted to "high speed" and the diff lock lever 18 is automatically set to the "cut" position by the interlocking arm 19. Compared with traveling at a considerably high speed, turning performance does not deteriorate and danger is eliminated. Also, the diff lock lever 1
Since 8 is provided on the handle post 10, operability is good. Further, the side clutch 23 includes an opening 40, a clutch plate insertion hole 41,
Since the clutch plate sliding hole 42 and the rotary shaft insertion hole 43 are provided to facilitate the putting in and taking out of the clutch plate 44, the assembling and disassembling becomes easy, and the replacement work when the clutch plate 44 is worn can be done easily in a short time. You can Moreover, since the entire configuration is simplified, the cost can be reduced.

In another embodiment of the present invention shown in FIGS. 10 to 12, the continuously variable transmission belt transmission system 14 in the above embodiment is eliminated and the hydraulic continuously variable transmission is provided between the transmission case 12 and the belt transmission system 13. A device (HST) 47 is provided,
The belt transmission system 13 is connected to the input shaft 47 of the hydraulic continuously variable transmission 47.
The output shaft 47b of the hydraulic continuously variable transmission 47 is connected to the belt transmission system 48 and is input to the transmission case 12. The belt transmission system 48 is provided with a tension pulley 48a. Hydraulic continuously variable transmission 47
Is operated by an auxiliary shift lever (not shown). On the other hand, a tension spring 49 is interposed between the main speed change lever 15 and the starting clutch pedal 36, and when the main speed change lever 15 is shifted to "high speed", the starting clutch pedal 36 moves upward. It is in a state where you cannot step on it.

In this embodiment, when the engine 8 is started, the main shift lever 15 is set to the "low speed" position, and the engine 8 is started while the start clutch pedal 36 is depressed. Therefore, the input shaft 47a of the hydraulic continuously variable transmission 47 can be lightly started without rotating. Further, it is safe because the main transmission lever 15 can be started only in the "low speed" position. When the engine 8 is started and the depression of the starting clutch pedal 36 is released, the tension clutch 13a becomes "engaged" by the action of the spring 13b and is input to the hydraulic continuously variable transmission device 47. Rotational power that has been shifted by the operation of the lever is input to the transmission case 12 via the belt transmission system 48 and transmitted to the main transmission unit 21 via the main clutch 20.

[0019]

As described above, according to the diff lock device for the agricultural traveling vehicle of the present invention, the diff lock lever for operating the diff lock device to "enter" and "off" is provided in the vicinity of the main shift lever provided on the handle post. The two gears are interlocked so that when the main shift lever is shifted to the "high speed" position, the differential lock lever is set to the "cut" position. Therefore, if the main gear shift lever is shifted to the "high speed" position when traveling on the road, the diff lock is automatically released and the turning operation can be performed safely. Further, since the diff lock device is automatically turned off during high speed running, it is possible to prevent accidental mistakes in forgetting to release the diff lock during high speed running.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of the present invention.

FIG. 2 is a cross-sectional view of the transmission unit and the differential unit.

FIG. 3 is a side view of the main part.

FIG. 4 is a front view of the same.

FIG. 5 is a side view of the entire riding rice transplanter to which the present invention is applied.

FIG. 6 is a plan view of the same.

FIG. 7 is a perspective view of a side clutch.

FIG. 8 is a sectional view of a side clutch.

FIG. 9 is a perspective view of a single clutch plate.

FIG. 10 is a system diagram of a power transmission unit according to another embodiment of the present invention.

FIG. 11 is a partial side view of the main part.

FIG. 12 is a plan view of the same.

[Explanation of symbols]

 1 Riding type rice transplanter 2 Agricultural traveling vehicle 3 Lifting link 4 Seedling planting device 5 Fertilizer application device 6 Front wheel 7 Rear wheel 8 Engine 9 Driver's seat 10 Handle post 11 Steering handle 12 Mission case 13 Belt transmission system 13a Tension clutch 14 Continuously variable belt Transmission system 15 Main transmission lever 16 Sub transmission lever 17 Shift groove 18 Differential lock lever 19 Interlocking arm 20 Main clutch 21 Main transmission unit 22 Seedling plant transmission unit 23 Side clutch 24 Front wheel differential device 25 Rear wheel differential device 26 Front wheel drive shaft 27 Front Axle 28 Differential lock device 29 Rotating shaft 30 Braking device 31 Rear wheel drive shaft 32 Universal joint 33 Transmission shaft 34 Rear wheel drive case 35 Clutch pedal 36 Starting clutch pedal 37 Rekipedaru 38 tensile support stay 39 clutch housing 40 opening 41 clutch plate insertion hole 42 clutch plate manually holes 43 and 45 rotating shaft insertion hole 44 clutch plate 46 sliding protrusion 47 hydraulic stepless transmission (HST) 48 belt transmission system 49 spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seike Rihaku, No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Pref.Iseki Agricultural Machinery Co., Ltd. (72) Inventor, Hisashi Kamiya, No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Pref.Iseki Agricultural Machinery Co., Ltd. (72) Inventor Hideyuki Kusama, No. 1, Yakura, Tobe-cho, Iyo-gun, Ehime Pref.

Claims (1)

Claims: 1. A pair of left and right front and rear wheels are provided, and the front and rear wheels are respectively driven through a differential device, and a differential lock device is provided in the differential device for the rear wheels. In an agricultural traveling vehicle, when a diff lock lever for operating the diff lock device to "enter" and "off" is provided in the vicinity of the main shift lever provided on the handle post and the main shift lever is shifted to the "high speed" position. , A differential lock device for agricultural traveling vehicles, characterized in that both levers are interlocked so that the differential lock lever is in the "cut" position.