JPS6359909B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a body support device for a four-wheel drive vehicle, and more particularly to a body support device for front wheels.

[Prior Art] Generally, in a riding-type rice transplanter, a planting work machine is connected to the vehicle through a lift mechanism provided at the rear of the vehicle, and the body of the vehicle moves forward and backward through a center pivot. It was supported by four wheels, and a differential device was installed between the drive unit and the rear wheels. As a result of having a center pivot between the body and the axle, when traveling on the road, the body rolls in the left and right directions around the center pivot, and the four wheels are always in contact with the ground.

[Problems to be solved by the invention] By the way, the location and size of the rice field,
Alternatively, depending on the user's preference, it is desired to provide a simple and inexpensive riding rice transplanter. The allencial device is also omitted, and the left and right front wheels are attached to final cases pivoted on the left and right sides of the aircraft, and the shock absorbers and mechanical parts necessary for steering the front wheels are omitted as much as possible to reduce weight. There is. When driving such a vehicle on the road and turning, the turning operation of the steering wheel is difficult due to the lack of a differential device and the omission of front wheel alignment necessary for steering. There is a drawback.

[Means for Solving the Problems] An object of the present invention is to provide a transmission case that is pivotally mounted on the tip side of a cover tube that covers a front wheel drive shaft that is integrally provided on both left and right sides of a transmission case that is a support section for the front wheels. By giving a caster angle to the final case, when the vehicle turns, the outer front wheels that are being driven are lifted off the ground, allowing only the inner wheels to perform steering operations, making it easier to steer the vehicle. An object of the present invention is to provide a body support device for a wheel drive vehicle.

[Example] The present invention will be described below with reference to an illustrated example.

FIG. 1 shows a riding-type rice transplanter to which the present invention is applied, in which a planting machine 3 is connected to the rear of a four-wheel drive vehicle 1 via a lift mechanism 2 so as to be movable up and down. Left and right rear wheels 6 and 7 (see FIG. 2) are pivotally attached to the ends of a pair of left and right chain cases 5 that constitute the body 4 of the vehicle 1. Cover tubes 20 and 21 that cover the front wheel drive shafts are integrally provided on both left and right sides of the front part of M.
The upper parts of final cases 8 and 9 are respectively pivotally attached to the front end sides of the wheels, and the left and right front wheels 1 are mounted on support shafts 11 and 12 (see Fig. 3) fixed to the lower parts of the final cases 8 and 9, respectively.
3 and 14 are respectively pivotally mounted. Each transmission case 8, 9 and the handle 15 are linked by an interlocking mechanism 16.
When the handle 15 is rotated left and right, the final cases 8 and 9 are also rotated in the same direction.

The final cases 8 and 9 are inclined at a positive caster angle θ with the upper part inclined backward, and when the vehicle 1 is moving forward in the direction of the arrow 17 and the handle 15 is rotated counterclockwise, Final cases 8 and 9 are indicated by arrows 1 in Fig. 3, respectively.
The left and right front wheels 13 and 14 are rotated to the positions indicated by chain lines 13A and 14A. Because the final cases 8 and 9 are attached to the fuselage 4 without going through the conventional center pivot, and because the caster angle θ is given, the left and right front wheels 13 and 14 are When the position shown by chain lines 13A and 14A is reached, the ground contact part 13a of the left front wheel 13 is lowered by a distance l ₁ with respect to the road surface 18, and the right front wheel 14 is lowered by a distance l 1 relative to the road surface 18.
It becomes a state where it increases by l ₂ , and as a result, l = l ₁ +
A height difference of l ₂ occurs between the front wheels 13, 14. That is, the front wheels 14 are separated from the road surface 18 by l, and only the front wheels 13 are in contact with the ground. Similarly, when the vehicle 1 turns to the right, only the inner wheels touch the ground, and the outer wheels rise above the road surface. In this way, the left and right rear wheels 6, which are driven together when the vehicle 1 turns, , 7 and the inner wheels of the front wheels 13 and 14, the rotating operation of the handle 15 is light and easy.

[Effects of the Invention] As described above, according to the present invention, in a four-wheel drive vehicle in which the front and rear wheels are connected to the body without a center pivot, the final case to which the front wheels are attached is By giving a caster angle, only the inner front wheels that are driven when the vehicle turns are in contact with the ground and the outer wheels are separated from the road surface, making it easier to turn when the vehicle is traveling on the road surface.
And it can be done easily. Further, since the differential is omitted, it is possible to provide a traveling vehicle with a simple structure, light weight, and low cost.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a riding rice transplanter to which the present invention is applied, FIG. 2 is a plan view of the same, FIG. 3 is a plan view of left and right front wheels, and FIG. 4 is a side view of the same. 1... Travel vehicle, 3... Planting work machine, 4... Airframe, 6, 7... Rear wheel, M... Mission case,
20, 21... Cover tube, 8, 9... Final case, 13... Left front wheel, 14... Right front wheel, θ... Caster angle.

Claims (1)

[Scope of Claims] 1. In a four-wheel drive vehicle in which the left and right rear wheels are pivotally connected to the body of the vehicle, and the left and right front wheels are pivotally connected to the ends of a final case that is pivotally connected to the left and right sides of the body. By providing a caster angle on the final case, which is pivotally attached to the tip of the cover tube that covers the front wheel drive shaft, which is integrally provided on both the left and right sides of the transmission case, the outer turning wheel of the front wheel can be raised when steering. A body support device for a four-wheel drive vehicle, characterized in that the body is supported by three wheels, that is, an inner wheel and left and right rear wheels, so that the vehicle can turn.