JPS58170670A - Steering gear for vehicle - Google Patents

Abstract

PURPOSE:To enable the steering of rear wheels, by connecting rear wheel steering tie rods to a member which extends in the front-to-rear direction of a vehicle and is swung by a steering wheel. CONSTITUTION:Front wheels 1 are steered by a steering wheel 11 through a gear box 13, rods 14 and tie rods 3. A rotary shaft 15 is provided in the gear box 13 to swing a member 17 through a lever 16 and a link 18. The member 17 is swung about a bracket 19. The member 17 extends in the front-to-rear direction of a vehicle. Tie rods 8 are attached to the rear of the swing member 17 to steer rear wheels 6. The front and the rear wheels 1, 6 are connected to each other through the swing member 17, which functions to steer the rear wheels.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle steering system that allows front wheels and rear wheels to be steered by steering operation of a steering wheel.

The present company has previously provided a vehicle steering system that can steer both the front wheels and the rear wheels by operating the steering wheels.

Specifically, in the steering device.

The structure is configured so that the rear wheels are steered in the same direction as the front wheels when a small steering angle operation of the steering wheel is generally performed while the vehicle is running at high speed, and the rear wheels are steered in the same direction as the front wheels when the steering wheel is steered at a large steering angle when the vehicle is running at low speed. It is configured to steer the wheels in the opposite direction to the front wheels or to return the steering angle of the rear wheels to zero. This improves the maneuverability of the vehicle when driving at high speeds, and reduces the turning radius when driving at low speeds, improving the maneuverability of the steered wheels, or when only the front wheels are steered. It can be made similar to a vehicle.

The present invention has been made to realize the steering operation of the rear wheels relative to the front wheels, which is performed according to the magnitude of the steering angle of the steered wheels, and to perform this operation using a novel mechanism. be.

An object of the present invention is to provide a steering device for a vehicle that steers both front wheels and rear wheels by steering operation of a steering wheel.
A swinging member connected to the steering wheel and swinging in conjunction with the rotation of the steering wheel is arranged to extend in the longitudinal direction of the vehicle, and a rear wheel steering tie rod is connected to the rear end of the swinging member. By this,
The present invention provides a steering device for a vehicle in which the rear wheels can be steered by moving a rear wheel steering tie rod in the left-right direction of the vehicle by swinging a swinging member.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The drawing is an overall perspective view of a vehicle, with the engine, body frame, etc. omitted, showing the basic structure of the device according to the present invention. The left and right front wheels 1, 1 have knuckle arms 2, 2 that can rotate left and right.
The outer port portions of left and right front wheel steering tie rods 3, 3 are connected to the front wheel knuckle arms 2, 2, respectively. By moving the tie rods 3, 3 in the left-right direction of the vehicle, the knuckle arms 2, 2 are rotated, and the front wheels 1 are steered. Front wheel knuckle arm 2
, 2 are suspended on the vehicle body by a front wheel suspension mechanism consisting of lower arms 4, 4, shock absorbers 5, 5, etc.

The left and right rear wheels 6, 6 are supported by east shaft portions 7a, 7a of a rear wheel knuckle arm 7.7, which is also rotatable left and right, and a tie rod 8, for steering the left and right rear wheels. 8
The outer end of the knuckle arm 7°T is connected to the knuckle arm 7°T. Movement of the tie rods 8, 8 in the left-right direction of the vehicle causes the knuckle arms 7, 7 to rotate, thereby steering the rear wheels 6, 6.

The rear wheel knuckle arm 7.7 is suspended on the vehicle body by a rear wheel suspension mechanism consisting of a lower wheel 9+9, a shock absorber 10.10, and the like.

An upper end of a steering shaft 12 is connected to a steering wheel 11 that is steered by a driver, and a lower portion of the steering shaft 12 faces the inside of a gear box 13 . A rod 14 is inserted into the gear box 13 so as to be slidable in the left-right direction of the vehicle, and the rotation of the steering shaft 12 by the steering wheel 11 is controlled by the rotation of the steering shaft 12 by the steering wheel 11 by a movement direction conversion mechanism inside the gear box 13 using a rack and pinion system or the like. This is converted into linear movement in the left and right directions of the vehicle. Since the inner ends of the left and right front wheel steering tie rods 3, 3 are connected to both ends of the rod 14, the tie rods 3, 3 move in the left-right direction of the vehicle together with the rod 14, thereby steering the front wheels 1.1. is accomplished.

Above gear box 13. Rod 14. tie rod 3,
The front wheel steering mechanism consisting of 3 is the same as the well-known one, and by making the gear box 13 a power 7 ring, the steering operation of the steered wheel 11 can be assisted by the auxiliary power of the power/ring. .

A rotating shaft 15 is vertically attached to the gear box 13, and a lever 1 whose rotating surface is a horizontal surface is attached to the lower end of the rotating shaft 15.
6 are combined. The rotation shaft 15 rotates due to the linear movement of the rod 14 in the left-right direction of the vehicle, and the rod 14 is used as a rack shaft.

By using the rotating shaft 15 as a pinion shaft that meshes with the rotating shaft 15, rotation of the rotating shaft 15 in accordance with the linear movement of the rod 14 is realized. The front part of a swinging member 17 is connected to the tip of the shaft 15 through a link 18, and the swinging member 17 has a length reaching from the front of the vehicle to the rear of the vehicle. It is arranged to extend in the longitudinal direction of the vehicle. The swinging member 17 has a swinging center shaft 19a provided in the middle part in the longitudinal direction.
It is able to swing freely in a horizontal plane about , and a swing center axis 19a is formed on a bracket 19 that is held on the vehicle body.

From the above structure, the steering wheel 11 and the swinging member 17 are connected to the steering shaft 1.
2. Gear box 13. When the front wheels 1, 1 are steered by rotating the steering wheel 11, the swinging member 17 is connected to the center IL" shaft 19a. swing around. The installation location of the lever 16 is not limited to the illustrated embodiment; for example, the lever 16 may be provided on the steering shaft 12 to realize the swinging of the swinging member 17. Further, the connection mechanism between the steering wheel 11 and the swinging member 17 is not limited to the illustrated example, and any mechanism can be adopted.

If necessary, the swinging member 17 may swing in conjunction with the rotation of the steering wheel 11.

The inner end portions of the left and right rear wheel steering tie rods 8, 8 are connected to the rear end of the swinging member 17 by a joint 20.20,
When the swinging member 17 swings in the left-right direction of the vehicle, the tie rods 8, 8 move in the left-right direction of the vehicle, steering the rear wheels 6, 60, and when the steering wheel 11 is rotated, the swinging member 17 swings. Therefore, the rear wheel steering operation is performed together with the front wheel steering operation by the front wheel steering mechanism.

Rear wheels 60 relative to the steering angle of the steered wheels 11 and the steering angle of the front wheels 1
The magnitude of the steering angle is determined by the amount of displacement of the rear wheel tie rod 8°8 in the left-right direction of the vehicle.
, depending on the lengths of the swinging member 17 and the link 18. Further, the ratio of the rear wheel turning angle to the front wheel turning angle is also determined by the position of the swinging center axis 19a of the swinging member 17, and the swinging center axis 19a can be changed in position relative to the swinging member 17 in the longitudinal direction of the vehicle. By doing so, the ratio of the rear wheel turning angle to the front wheel turning angle can be set to a desirable value. In order to make the position of the swinging center shaft 19a changeable in this way, it is possible to change the position of the swinging center shaft 19a by making the hole 17a of the swinging member 17 into which the center shaft 19a is fitted into a long hole elongated in the longitudinal direction of the vehicle, as shown in the figure.
This can be done by sliding the position of the central axis 17a along the elongated hole 17a by moving the bracket 19 on which it is formed relative to the vehicle body.

By providing the gear box 13 and other parts with a transmission mechanism that determines the ratio of the rotation angle of the lever 16° swinging member 170 to the steering angle of the steering wheel 11, the lever 16.degree. The rotation angle range of the swinging member 17 can be determined arbitrarily, so that when the steering wheel 11 is operated at a small steering angle, the rear wheels 6, 6 are steered in the same direction as the front wheels 1.1, and the steering wheel 11 is turned in the same direction as the front wheels 1.1. When operating a large steering angle, the rear wheels 6, 6 are steered in the opposite direction to the front wheels 1, 1, or when operating a small steering angle of the steered wheels 11, the rear wheels 6, 6 are steered in the same direction as the front wheels 1, 1. When the steering wheel 11 is operated to a large steering angle while steering the vehicle, it is possible to return the steering angle of the rear wheels 6, 6 to zero or close to it.

As is clear from the above description, according to the present invention, a swinging member connected to a steering wheel and swinging in conjunction with the rotation of the steering wheel is disposed to extend in the longitudinal direction of the vehicle, Since the tie rod for steering the rear wheels is connected, the swinging member swings the rear wheels along with the front wheels in the same direction according to the steering angle of the steered wheels.
It becomes possible to steer the vehicle in the opposite direction, etc., and the rear wheel steering operation can be realized by a simplified mechanism using relatively few parts.

[Brief explanation of drawings]

1 is an overall perspective view of a vehicle showing an embodiment of the present invention in the drawings; FIG. In the top view, 1 is a front wheel, 6 is a rear wheel, 8 is a tie rod for steering the rear wheels, 11 is a steering wheel, and 17 is a swinging member. 19a is a swing center axis. Patent Applicant Honda Motor Co., Ltd. Agent Patent Attorney 2 1) Yong-Soku

Claims (2)

[Claims] (1) In a vehicle steering system in which the front wheels and the rear wheels are steered by steering operation of the steering wheel. - A swinging member connected to the steering wheel and swinging in conjunction with the rotation of the steering wheel is arranged to extend in the longitudinal direction of the vehicle, and a tie rod for rear wheel steering is provided at the rear end of the swinging member. A vehicle steering device characterized by being connected. (2) The vehicle steering system according to claim 1, wherein the swing center axis of the swing member is positionally adjustable in the longitudinal direction of the vehicle with respect to the swing member.