JP2829746B2 - Vehicle lateral movement steering system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a work vehicle and a transport vehicle (hereinafter referred to as a vehicle, etc.).
The present invention relates to a lateral movement steering device.

(Prior art) In a working vehicle that performs agricultural work or a transport vehicle that is used for transporting cargo, etc., the steered wheels are almost in the traveling direction of the vehicle body.
If steering is possible by turning 90 °, it is possible to change direction while moving at right angles to the ridge when reciprocating in the ridge,
Since the vehicle can be moved laterally in narrow passageways without changing the direction of the vehicle body, the efficiency of agricultural work and transport work is further improved.

For this reason, various steering devices have been conventionally proposed to achieve the above object.

For example, those described in Japanese Utility Model Laid-Open Publication No.
Four sets of traveling devices are provided in the lower part of the vehicle body. Traveling motors are provided for traveling devices located on diagonal lines of these traveling devices.

Each of the front and rear traveling devices can be turned by a conversion motor, and is configured so that the vehicle body can travel in an arbitrary direction by independently or simultaneously steering the front traveling device and the rear traveling device. .

(Problems to be Solved by the Invention) However, in the conventional steering device described above, since the independent traveling motors are provided on one side of the front traveling device and the rear traveling device, respectively, two traveling motors are required and the driving system is expensive. Becomes

In addition, the one in which four wheels are driven by one traveling motor and the four wheels can be steered by the direction control means, wherein the input side sprocket and the drive side bevel gear are interlocked is disclosed in Although the interlocking means such as a bevel gear for driving the driving wheels is formed inside the wheel mounting frame, which is proposed in Japanese Patent No. 116743, the wheel mounting frame becomes large, and the positions of the wheels and the rotating shaft of the wheels are increased. , There is a problem that the steering operation is not stable.

SUMMARY OF THE INVENTION The present invention has been made for the purpose of improving the above-mentioned problems, and has as its object to provide an inexpensive lateral movement steering device for a vehicle that makes it possible to turn wheels smoothly and that makes effective use of space.

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the present invention provides a wheel frame that rotatably supports a drive shaft in front and rear of a vehicle body and has a steering shaft projecting upward. A plurality of wheels capable of turning integrally with a wheel frame about a steering shaft, and the front wheels and the rear wheels are made freely turnable independently by a forward steering motor and a reverse steering motor. Drive sprockets are provided via a one-way clutch arranged so that the ones located diagonally on the drive shaft are in the same direction and the ones located next to it are engaged in different directions, and these drive sprockets and the steering shaft are provided. The input sprockets provided on the vehicle are interlocked by interlocking means provided outside the wheel frame, and each of the input sprockets is driven by one It is an object of the present invention to provide a lateral movement steering device for a vehicle which is simultaneously driven by a row motor via interlocking means.

As described above, according to the present invention, the input sprocket is provided on the steering shaft, and the rotation center of the input sprocket and the rotation center of the wheel are made to coincide with each other, that is, the rotation center of the steering is made coincident with the rotation center of the wheel. In addition to being able to rotate, space can be used effectively.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a vehicle body, two wheels on a front side at a lower part, and two on a rear side.
A wheel 2 is provided.

As shown in FIG. 3, each wheel 2 is fixed to a drive shaft 3, and both ends of the drive shaft 3 are rotatably supported by a wheel frame 5 via a one-way clutch 24 and a bearing 4.

The wheel frame 5 is formed in a substantially U-shape whose lower end is open, and a steering shaft 6 protrudes upward at an upper portion.

The steering shaft 6 is rotatably supported by the vehicle body 1 and has a thrust bearing 7 interposed between the wheel frame 5 and the vehicle body 1 to support the vehicle body load.

An input sprocket 9 is supported on the upper end of the steering shaft 6 via a bearing 8, and a steering sprocket 10 is fixed to the upper end.

The input sprocket 9 is formed integrally with the miter gear 11.
And a miter gear 13 of an output shaft 12 provided horizontally in a direction perpendicular to the axis.

An endless chain 16 links the output sprocket 14 fixed to the output shaft 12 and the drive sprocket 15 provided at one end of the drive shaft 3.

The drive shaft 3 is fixed to the tire via a one-way clutch 24.

The direction of the one-way clutch 24 is a direction in which the front right wheel and the rear left wheel are engaged during forward movement, and a direction in which the front left wheel and the rear right wheel are engaged during backward movement.

On the other hand, an endless drive chain 18 is wound around the input sprocket 9 provided on the steering shaft 6 of each wheel 2.

As shown in FIG. 1, the drive chain 18 is engaged with a sprocket 19a of a traveling motor 19 mounted on the bottom of the vehicle body 1, and the traveling motor 19 causes the input sprockets 9 to simultaneously move in the same direction via the driving chain 18. To be driven.

An endless chain 21 is wound around a steering sprocket 10 fixed to the steering shaft 6 of the wheel 2 provided on the front side of the vehicle body 1 and a sprocket 20a of the forward steering motor 20, and the wheel 2 provided on the rear side is provided. Steering sprocket 10 fixed to each steering shaft 6
An endless chain 23 is wound around a sprocket 22a of the reverse steering motor 22. (See also FIG. 2) Next, the operation will be described. For example, when moving along the ridge 25 as shown in FIG.
Turn the front and rear wheels 2 in the front and rear direction, and in this state, the traveling motor 19
Drives the input sprocket 9 via the drive chain 18.

The driving force input to the input sprocket 9 is a miter gear
The transmission is transmitted to the output shaft 12 via the output sprockets 11 and 13, and further transmitted from the output sprocket 14 to the driving sprocket 15 via the chain 16. Between the driving sprocket 15 and the driving shaft 3, the front wheel 2 and the rear A two-way clutch 24 is provided in which the diagonally located wheels 2 are engaged in the same direction and the adjacent ones are engaged in different directions, so that the right wheel of the front wheels 2 and the rear wheel 2 The one-way clutch 24 on the left wheel of the wheel 2 is engaged to transmit the driving force. Thereby, the vehicle body 1 advances with the right wheel of the front wheels 2 and the left wheel of the rear wheels 2 as drive wheels.

When the front ridge 25 'is reached by the forward movement of the vehicle body 1, the front and rear steering motors 20, 22 are simultaneously rotated to rotate the steering shaft 6 of the front wheel 2 and the rear wheel 2 by 90 degrees.

When the traveling motor 19 is rotated in this state, the same driving wheels as those at the time of forward movement can be driven to move the vehicle body 1 in the lateral direction (the direction of FIG. 3 (A)).

When the predetermined lateral movement is completed, the front and rear wheels 2 are turned to the original positions, and then the traveling motor 19 is rotated in the reverse direction. 1 starts reverse movement in the direction of FIG.

As described above, since the lateral movement can be performed in the direction perpendicular to the traveling direction of the vehicle body 1, the traveling direction can be easily changed.

(Effect of the Invention) The present invention arranges an input sprocket on a steering shaft and makes the rotation center of the input sprocket coincide with the rotation center of the axle, whereby the wheels can be rotated without difficulty. The present invention provides a laterally-moving steering device that enables a smooth turning at a low cost and that can effectively use space.

[Brief description of the drawings]

1 and 2 are plan views of a drive system, FIG. 3 is a cross-sectional view of the vicinity of wheels, and FIGS. 4 and 5 are operation explanatory views. 1 ... body, 2 ... wheels, 3 ... drive shaft, 5 ... wheel frame, 6 ... steering shaft, 9 ... input sprocket, 15 ... drive sprocket, 18 ... chain, 19 ... travel motor , 20: Forward steering motor, 22: Reverse steering motor, 24: One-way clutch.

Claims (1)

(57) [Claims] 1. A wheel frame (5) having a drive shaft rotatably supported in front and rear of a vehicle body (1), and a steering shaft (6) protruding upward, and a steering shaft (6) as a center. A plurality of wheels (2) that can be turned integrally with the wheel frame (5), and the front wheels (2) and the rear wheels (2) are controlled by a forward steering motor (20) and a reverse steering motor (22). A one-way arrangement in which the wheels are independently rotatable and the wheels located on the diagonal of the drive shaft of each wheel are engaged in the same direction, and the adjacent ones are engaged in different directions. A drive sprocket (15) is provided via a clutch (24), and a space between the drive sprocket (15) and the input sprocket (9) provided on the steering shaft (6) is provided outside the wheel frame (5). Linked by the linked means In both cases, the above-mentioned input sprockets (9) are simultaneously driven by a single traveling motor (19) via interlocking means, and a lateral movement steering device for a vehicle.