JPS61119423A - Four wheel drive working vehicle - Google Patents

Abstract

PURPOSE:To enable a vehicle to make a cornering smoothly with a smaller radius even if the ground surface is soft by interlocking a right and left steered wheels with a differential gear, and also interlocking simultaneously a right and left non-steered wheels with a differential gear equipped with a differential locking mechanism by way of a steering clutch. CONSTITUTION:The output from an engine 1 is transmitted to front wheels 4 by way of a transmission 7 and a differential gear C, and is simultaneously transmitted to rear wheels 5 by way of the transmission 7, a differential gear D equipped with a differential locking mechanism 8, and a right and left steering clutches. When the steering clutch 9 is on, its meshing pawl 9b is allowed to be pushed in a sleeve 8a of the differential locking mechanism 8 permitting the differential gear D to operate. And when one of the steering clutches 9 is off, one of the sleeves 8a is allowed to be connected with a meshing pawl 15a of a differential side gear 15 causing the differential gear D not to operate. Accordingly, this configuration enables a vehicle to make a cornering with a smaller radius at the rear wheel 5 on the cornering side by pressing a pedal 17 on the cornering side at a time of cornering.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a four-wheel drive type working vehicle, and is mainly equipped on a vehicle body that often travels on relatively soft ground, such as a rice transplanter. It relates to a traveling drive structure.

[Conventional technology]

BACKGROUND ART Conventionally, the following two types of configurations are widely known as traveling drive structures for rice transplanters, which are a line of working vehicles that travel on soft ground.

The first configuration is one in which both the front and rear wheels are driven via a differential device, and the rear wheels are provided with two left and right void brakes (for example, Japanese Utility Model Publication No. 56-1118!M1). In addition, it is driven through the second configuration and the Fi front single-wheel differential, and furthermore, the rear wheels are driven through two left and right steering clutches (for example, Utility Model No. 58-10798).
Publication No. 0).

[Problem that the invention seeks to solve]

In the first configuration, the rear wheels are driven via a differential device, which allows the vehicle to turn smoothly on the road, but when making a sharp turn on soft ground such as a wet field, the brakes on one side are activated. The wheels on the other side would be driven at double speed, which could cause this wheel to slip and result in insufficient propulsive force.

In addition, in the second configuration, by disengaging the steering clutch on the inside of the turn to stop the inside wheels and driving the outside wheels at a predetermined low speed, it is possible to turn around the inside wheels. This eliminates the wheel slip mentioned above, but when the vehicle is turned while driving on the road and is turned using only the steering wheels, the left and right rear wheels are driven at the same speed. The rear wheels on one side sometimes slipped, making it difficult to turn smoothly.

The present invention has been made in view of the above circumstances, and consists of the two configurations described above. To provide a four-wheel drive working vehicle that makes use of #, Fr, can smoothly turn the vehicle body in a small radius even on relatively soft ground such as paddy fields, and can also smoothly turn the vehicle body when driving on the road. Point VC has the first purpose, and the second purpose is to make it possible to turn the vehicle body in rice fields etc. with simple operation by rationally modifying the linkage of this four-wheel drive type work vehicle. have

[First means for solving the problem] The first invention is characterized in that the left and right steering wheels are interlocked and connected to a differential gear, and the left and right non-steerable wheels are steered by a differential gear with a differential lock mechanism. They are interlocked and connected via a clutch, and their actions and effects are as follows.

[Operation of the first invention] In other words, as described above, since the left and right non-lateral wheels are interlocked and connected via a differential device with a differential lock mechanism and a steering clutch, when the vehicle body is turned on soft ground such as a paddy field. In this case, by setting the differential lock mechanism to the active position and disengaging the steering clutch on the side in the turning direction, only the wheels on the other side will be restrained. A small turn around the wheel is 9 canters. In other words, −
Even if the steering clutch is disengaged, the differential gear is set to the differential lock state, so the differential shaft of the differential gear on the side where the steering clutch is disengaged will not rotate freely. This allows the driving force to be transmitted to the other wheel.

Further, by simply setting the differential lock mechanism to a non-operating state, it is possible to turn smoothly by activating the differential device when driving on the road.

[Effects of the first invention] Therefore, a four-wheel drive working vehicle is provided that can turn smoothly and with a small radius even on relatively soft ground such as rice fields, and can also turn smoothly when driving on the road. It came to be.

A second precautionary means to solve problem c] Features of the second invention i! The left and right steering wheels are transferred to the differential gear.
J connection, and the left and right non-lateral wheels are interlocked and connected via a steering clutch to a differential gear equipped with a differential lock mechanism ff1iVc, so that the differential lock mechanism is switched to a lock operating state in conjunction with the disengagement operation of the steering clutch. The configured point 1c4, its action, and effect are as follows.

[Operation of the second invention] In other words, as mentioned above, the differential lock mechanism is activated in conjunction with the careful operation of the steering clutch! ! 1lVC, so when turning the vehicle in rice fields etc. 1'? :By simply disengaging and operating the steering clutch on the side that is turning, the differential gear can be set to the differential zero position ll1fi without performing any other operations.

[Effects of the Second Invention] Therefore, by rationally modifying the linkage, in addition to the effects of the first invention, it is now possible to turn the vehicle body in rice fields or the like with a simple operation.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 2, the engine fi+ is mounted on the curved part, and the steering handle (2) and seat (
3) The front wheel 1 for left and right steering
4), fil, and front wheels for left and right steering (5), (5)
, f61 Tej! An example of a 4-wheel drive I#l type work vehicle, which is configured with a flvcFR that can run, and further connects a multi-row seedling planting device A3+ to the rear end of the machine so that it can be raised and lowered via a link mechanism (61). A riding rice transplanter called N4 has been developed.

As shown in the same figure and FIG. The travel drive system is configured so that the signal is transmitted to the rear wheels 161 and fat via the tsl e tel.

As shown in FIGS. 8 and 4, the differential lock mechanism (
8) with a bevel gear attached to the output shaft of the traveling transmission (7), and this bevel gear 〒σ℃
The ring gear 〒l13 and the ring gear 〒a3 are dammed and the northern-shaped differential case 1st differential case (the axis of l [F
The differential case (114, +141 differential case 1131clff shaft center P) is fitted rotatably around the axis perpendicular to the differential case (114, +141 differential case 1131clff axis P), and the nine-tube side gear is 1a5, and the axis of the differential case D (
It consists of a support shaft (161) provided on the differential f-id gear (to), and the shaft itself is the differential shaft.

It is also used. And De7 Day Dogi〒09,(3
The outer end VC C of ) is formed with engaging pawls (15a), (15a) projecting radially downward relative to the axis P), respectively, and a transmission shaft (5a) interlockingly connected to the left and right rear wheels 15), 15). ,
Sleeves (9a) spline fitted to (5a), (9
The occlusal nails (9b) and (9b) of a) are connected to the occlusal nails (15a).
), (15a), the rear wheels 15), (5
), flSt becomes sharp.

In addition, this sleeve (9a), (9a) and the occlusal nail (9b)
).

(9b) is referred to as the steering clutch (9) 1 [91. and a pedal u71 provided in the driving section (■),
When αη is depressed, the steering clutch +91, (91 is disengaged, and at the same time, the brake ill
, αS are operated, and the rotation of the rear wheel t61*(nl can be stopped either alternatively or simultaneously.

Note that the support euerc is the differential pinion gear 〒114
The first pivot shaft (14a) is disposed suddenly in a penetrating manner, and the first pivot shaft (14a)
Position the differential gear ↑ (15, (Is) with the circlips ■ and ■ provided at both ends of 61, and insert both ends into the transmission shafts (5a) and (5g) to
m) and (5a) prevent core wobbling.

The above-mentioned differential side gears are set so as to match the outer surface of the differential case U, and the protrusion amount t with respect to the fineness (P) of the articulating claws (15) and (15a) formed in (15) and (5) is set to match the outer surface of the differential case U. (15a), (i5a) and both ends of the differential case 13 are splines (158), (
158).

(13s), (13s) t-form, def goose u3
On the side splines (18s), (18s), the sleeves (8a), (8a) are slidable via the spline ridges (8b) formed on the sleeve (8a), and are fitted with Spring Co., Ltd., +211. It is arranged so as to be biased in the direction of the occlusal claw (15a)*(15a).

Then, the steering clutch f91, (seven VcFi with sl in the engaged state, steering clutch fsl*f9
) of the sleeve (
8a) and (8a), the sleeves (8a) and (8a) corresponding to the above-mentioned occlusal claws (15)
a), (15a) and fk into the spline connected state, the differential gear 0 is configured to stop its operation. Here, the sleeve (8a) and the spline (8b) formed on the sleeve (8a) are referred to as a differential lock mechanism (8). Therefore, when turning the aircraft in rice fields, V? :ha, l
By operating the steering handle (4) described in Chapter 1, it becomes possible to turn, and by lightly adjusting the amount of pedal operation (171), the steering clutch +91, +9
It is also possible to put the differential gear (2) into the differential lock state without turning off the power.

[Bessou example]

In this embodiment, a differential lock mechanism ta> * (gl is formed at both ends of the differential case +13, and an operating clutch ts+
e The differential lock mechanism (3) will operate at the same time as the (" operation.

However, as shown in FIG.
) externally through the spline, and
It may be configured so that the JK-formed occlusal nail (15a) is engaged with the occlusal nail (15a) by an independent operation. In addition, in this configuration, the occluding claw (1) on the detent side that the sleeve (8a) engages
The width in the direction along the axis G)3 of 5a) is the width of the steering clutch (
9) Make it large so that it is possible even when it is in the state.

Furthermore, although this embodiment is not configured to perform the differential lock operation using the biasing force of the spring Qυ, as shown in FIG.
a) through member 4, and connect the sleeve (9) on the transmission shaft side.
A) Forced VC differential device by operation in the cutting direction■
1 may be in a deblock state.

It should be noted that the present invention may be applied to a four-wheel drive type working vehicle such as an agricultural tractor in addition to the farm machine.

[Brief explanation of the drawing]

The drawings show an embodiment of a four-wheel drive type work vehicle according to the present invention,
A schematic plan view showing the travel drive system of the first rice transplanter, Figure 2 is an overall side view of the rice transplanter, Figure 3 is a cross-sectional plan view of the differential gear, etc., and the disassembled diagram shows the steering clutch. It is a perspective view, and FIGS. 5 and 6 are cross-sectional views showing another embodiment of the steering clutch. (4)... Left and right steering wheels, (6)...
Left and right steering wheels, (8)...Differential lock tlki
l,! 91...Steering clutch, C), I)
)・・・・・・Difference 11J! Place.

Claims (1)

[Claims] [1] The left and right steering wheels (4), (4) are interlocked and connected to the differential device (C), and the left and right non-steer wheels (5), (5)
A four-wheel drive work vehicle in which a differential gear (D) with a deflock mechanism (8) is interlocked with the steering clutches (9), (9). [2] The left and right steering wheels (4), (4) are interlocked and connected to the differential device (C), and the left and right non-steer wheels (5), (5)
is interlocked and connected to a differential device (D) with a deflock mechanism (8) via steering clutches (9), (9), and is interlocked with the disengagement of said steering clutches (9), (9). A four-wheel drive type work vehicle, wherein the differential lock mechanism (8) is configured to be switched to a locking state.