JPH0579548A - Agricultural running vehicle - Google Patents

Abstract

PURPOSE:To prevent erronous operation of switching a main transmission gear over to on-road running speed during operation by providing a regulation means for preventing the main transmission gear from being shifted to on-road running speed when differential function is stopped by a differential locking device. CONSTITUTION:A main transmission gear B for preferentially switching between on-road running speed and operational speed, differential devices D, E for distributing and transmitting driving force to right or left driving wheel according to a load, are provided. Differential locking devices F, H for stopping the function of the differential devices D, E and thus for equally transmitting driving force to the right and left driving wheels, are provided. A regulation means for preventing the main transmission gear B from being shifted to on-road running speed when the differential function is stopped by the differential devices F, H, is also provided. Since the main transmission gear B of an agricultural running vehicle is not shifted to on-road running speed under a differentially locked condition, abrupt running or slipping and so on at the time of working due to erronous operation of a change lever are thus prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural traveling vehicle equipped with a working device such as a rice transplanter.

[0002]

2. Description of the Related Art Agricultural traveling vehicles such as rice transplanters are equipped with a main transmission that selectively switches between a high road speed and a low work speed change lever, and this main transmission is shifted to a road speed on the road. , In the field, it shifts to the work speed and travels. In addition, many agricultural traveling vehicles are equipped with a diff device.When traveling on the road, this diff device is used to ensure smooth running, but when working, the diff device is locked to maintain straightness. The driving force is evenly transmitted to the left and right driving wheels.

[0003]

In the above agricultural traveling vehicle, the change lever may be erroneously operated during work, and the main transmission may be switched to the road traveling speed.
If such an erroneous operation is performed, the working unit may be stopped to leave unplanted plants and the agricultural traveling vehicle may run out of control. Then, this invention makes it a subject to prevent the said erroneous operation.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, an agricultural traveling vehicle according to the present invention includes a main transmission that selectively switches between road traveling speed and working speed, a diff device that distributes and transmits a driving force to left and right driving wheels according to a load, and a diff device of the diff device. In an agricultural traveling vehicle equipped with a diff lock device that stops the function and transmits the driving force evenly to the left and right driving wheels,
It is characterized in that a regulating means is provided for regulating so that the main transmission is not shifted to a road speed when the diff lock device stops the diff function.

[0005]

Since the control means is provided to prevent the main transmission from shifting to the road traveling speed when the diff lock device stops the diff function, erroneous operation of switching the main transmission to the road traveling speed during work is prevented. To be done.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments shown in the drawings will be described below. 1 and 2 show the usage state of an agricultural traveling vehicle that is an embodiment of the present invention. The agricultural traveling vehicle 1 is equipped with a rice planting device 3 with a lifting link device 2 and is provided with a fertilizer application device 4 as a whole. It is configured as a fertilizer planter.

The agricultural traveling vehicle 1 is a four-wheel drive vehicle having a pair of left and right front wheels 6, 6 and rear wheels 7, 7 which are drive wheels. Mission case 1 on the mainframe 10
1 and an engine 12 are arranged in the front and rear, a hydraulic pump 13 is integrally assembled on a rear upper surface of the transmission case 11, and a steering post 14 is provided so as to project upward from a front portion of the transmission case 11. A steering handle 16 and an operation panel 17 are provided on the upper end of the steering post 14. Step 19 is installed on the upper part of the machine to serve as a control floor.
A cockpit 20 is installed above the engine 12.
The front wheels 6 and 6 are pivotally supported by front wheel support cases 22 and 22 that are provided so as to be laterally deflectable to the mission case 11.
The rear wheels 7, 7 are pivotally supported by rear wheel support cases 24, 24 integrally attached to the left and right ends of the rolling rod 23. The rolling rod 23 is rotatably supported by a rolling shaft 25 projecting from the rear end of the main frame 10 in a plane perpendicular to the traveling direction.

Rotational power of the engine 12 is transmitted to a counter shaft 32, which is a drive shaft of the hydraulic pump 13, via a belt 31, and is further transmitted from the counter shaft to a mission input shaft 34 via a belt 33. The pulleys 35, 36 around which the belt 33 is hung are constructed so that the width of the belt groove can be adjusted, and the transmission ratio can be continuously changed by adjusting the belt groove width to change the effective diameter. it can. That is, the transmission portion from the counter shaft 32 to the mission input shaft 34 is configured as a belt continuously variable transmission auxiliary transmission device A.

3 and 4 are views showing the inside of the mission case 11 in a developed state. 3 shows the front part of the mission case and FIG. 4 shows the rear part of the mission case, which are connected to each other on the XX plane of the casing 40. Further, the Y portion is a front view of the mission case displayed in a different cross section.

A transmission is transmitted from the pulley 36 to the transmission input shaft 34 via a main clutch 43. The main clutch 43 is a well-known multi-disc clutch. In the figure, 44 is a friction plate on the main clutch shaft side, 45 is a friction plate on the transmission input shaft side, 46 is a spring for pressing both friction plates, 4
Reference numerals 7 and 48 are a fixed member and a sliding member for switching operation.

A transmission input shaft 34, a counter shaft 50, a traveling primary shaft 51, a traveling secondary shaft 52, a planted primary shaft 53, and a planted secondary shaft 54 are supported in parallel on the front portion of the casing 40. ing. Gear G of the mission input shaft 34
1 and the gear G2 of the counter shaft 50, and the gear G2 and the gear G3 of the traveling primary shaft 51 mesh with each other,
The rotation of the mission input shaft 34 is transmitted to the traveling primary shaft 51 in the forward direction.

As the main transmission device B, the gears G3 and G4 are fitted in fixed positions on the traveling primary shaft 51, and gears G5 and G6 are integrally formed on the traveling secondary shaft 52.
Are fitted so as to be slidable in the axial direction. When the gears G5 and G6 are moved by the shifter 56 and the gears G4 and G5 mesh with each other, the working speed becomes low, and when the gears G3 and G4 mesh, the road traveling speed becomes high. Further, a gear G7 and a back gear G8, which are constantly meshed with the gear G4, are fitted to the planted primary shaft 53, and when the gear G6 is meshed with the back gear G8, a reverse speed is obtained. The position where the gears G5 and G6 do not mesh with any of the gears is neutral. The change lever 90 operated by the main transmission B is provided on the operation panel 17.

Further, as the inter-stock transmission C, gears G9 and G10, which are integrally formed with each other, are fitted on a planted primary shaft 53 slidably in the axial direction, and a planted secondary shaft 54 is also provided.
Gears G11 and G12 are attached to each.
By appropriately moving the gears G9 and G11 with the shifter 57, the gear G9 and the gear G10, and the gear G10 and the gear 1
1, and three combinations of the gear G10 and the gear G12 are obtained, and three-stage stock switch can be performed. Secondary axis 5 with planting
4 is transmitted to the planting part transmission shaft 58 via the bevel gears G13 and G14.

Rear axles 60, 60 and front axles 61, 61 are supported at the rear of the casing 40.
The power is transmitted from the traveling secondary shaft 52 to the rear axles 60, 60 via the rear differential device D, and the front axle 6 is transmitted from the rear differential device D via the front differential device E.
It is transmitted to 1,61.

The rear differential device D includes a container 63 in which a gear G16 meshing with a gear G15 of the traveling secondary shaft 52 is formed on the outer peripheral portion, and a primary bevel gear G17 attached to a vertical axis 64 in the container and left and right rear axles. Secondary bevel gears G18 and G18 separately attached to 60 and 60 are housed in a state of meshing with each other, and the driving force transmitted to each axle is appropriately changed.

The front diffracting device E has the same structure as the rear diffracting device D. In the figure, 65 is a container, 66 is a vertical axis, G19 is a rear differential gear, G20 is a front differential gear, and G21 is a vertical axis. Bevel gear attached to 66, G2
Reference numeral 2 is a bevel gear attached to the front axle 61.

The rear differential device D and the front differential device E are provided with differential lock devices F and H for stopping the differential function so that the driving force is evenly transmitted to the left and right axles. This diff lock device F (H) is used for the container 6
Claws 69 (70) formed in 3 (64) and claws 73 of the diff lock member 71 (72) fitted to the square rod portion of the axle.
(74) and the axle 50 (51) are fixed to each other. A diff lock lever 91 for operating the diff lock devices F and H is provided on the operation panel 17.

The rear axles 60, 60 are bevel gears G2.
, G24, ... are connected to the side clutch shafts 76, 76 by power transmission, and further transmitted from the side clutch shafts to the rear output shafts 77, 77 through the side clutches I, I. The side clutch I is a multi-plate clutch, 80 is a friction plate on the side clutch shaft side, and 81 is a friction plate on the rear output shaft side. Reference numeral 82 denotes an actuating cylinder slidably fitted to the rear output shaft 77, which is biased by a leaf spring 83 in a direction of pressing both friction plates, and a side clutch I is normally engaged. When the operating cylinder 82 is moved by the shifter 85 in the direction opposite to the urging direction, the side clutch I is disengaged.

Rear wheel brake devices J, J are provided on the rear output shafts 77, 77. The rear wheel braking device J presses the pressure plates 88, ... On the discs 87, ... Attached to the rear output shaft 77 for braking.
The drive of the pressure plates 88, ...
Do in 2. That is, the side clutch I is always on,
When the rear wheel brake device J is not applied and the operating cylinder 82 is moved in the direction opposite to the urging direction, the side clutch I is disengaged and the rear wheel brake device J is applied. The side clutch I and the rear wheel brake device J are operated by the brake pedals 100, 100 provided on the step 19 for each of the left and right sides.

The rear end portions of the rear output shafts 77, 77 project outside the casing 40, and the rear wheel transmission shafts 89, 89 for transmitting power to the rear wheel support cases 24, 24 are connected to the projecting end portions.

5 and 6 show the mounting portions of the change lever 90 and the diff lock lever 91. Both levers 90, 9
1 is attached to a common mounting shaft 92, and is rotated back and forth together along the guide grooves 94 and 95. The operation positions of the change lever 90 are backward speed, neutral speed, working speed, and road speed in order from the front. Further, when the diff lock lever 91 is operated forward, the diff lock is performed, and when it is operated backward, the diff on is performed. The diff lock lever 91 is provided so as to be rotatable left and right, and is biased to the right by a spring 96, so that when the diff lock is operated, the diff lock lever 91 engages with the bent portion 95 a of the guide groove 95. The diff lock position corresponds to the working speed position and the diff on position corresponds to the road traveling speed position, and a restricting rod 97 protruding to the rear of the change lever 90 is fixed to the diff lock lever 91.

At the time of traveling on the road, the diff lock lever 91 is set to the diff on position, and the change lever 90 is shifted to the traveling speed on the road. When planting, the diff lock lever 91 is set to the diff lock, and the change lever is shifted to the working speed.
In this state, the restriction rod 97 interferes with the change lever 90 so that it cannot be operated at road speed. Therefore, it is possible to prevent an erroneous operation in which the main transmission B is accidentally switched to the road traveling speed during the planting work.

7 and 8 show different examples of the lever mounting portion. In this lever mounting portion, a restriction rod 98 protruding forward of the diff lock lever 91 is fixed to the change lever 90. For this reason, when the change lever 90 is operated to the traveling speed on the road, it is pushed by the restriction rod 98 and the diff lock lever 91 is automatically operated to diff on.

[0024]

As described above, in the agricultural traveling vehicle according to the present invention, since the main transmission is not shifted to the road traveling speed in the diff-lock state, runaway or slip at the time of work due to erroneous operation of the change lever is prevented. I can do it.

[Brief description of drawings]

FIG. 1 is a side view showing a usage state of a fertilizer application planting machine according to an embodiment of the present invention.

FIG. 2 is a plan view of the fertilized rice transplanter shown in FIG.

FIG. 3 is a developed sectional view of a front portion of a mission case.

FIG. 4 is a developed sectional view of a rear portion of a mission case.

FIG. 5 is a perspective view of a lever mounting portion.

6 is a plan view of a lever mounting portion shown in FIG.

FIG. 7 is a perspective view of a lever mounting portion different from the above.

8 is a plan view of the lever mounting portion shown in FIG.

[Explanation of symbols]

 1 Agricultural traveling vehicle 3 Rice transplanter 4 Fertilizer application 6 Front wheel 7 Rear wheel 11 Engine 12 Mission case 90 Change lever 91 Differential lock lever 97,98 Control rod (Regulator) B Main transmission device D Rear differential device E Front differential device F, H Differential lock apparatus

 ─────────────────────────────────────────────────── ─── 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 (72) Invention Nomura Katsu No. 1 Yakura, Tobe Town, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A main transmission that selectively switches between a road speed and a working speed, a diff device that distributes and transmits a driving force to left and right driving wheels according to a load, and a left and right device that stops the function of the diff device. In an agricultural traveling vehicle provided with a diff lock device for evenly transmitting a driving force to driving wheels, a regulation that restricts the main transmission device from shifting to road traveling speed when the diff function is stopped by the diff lock device. An agricultural traveling vehicle, characterized in that it is provided with means.