JPS63255184A - Steering device for automobile - Google Patents

Abstract

PURPOSE:To simplify the structure of a rack and pinion type steering device by directly connecting a rack to a center lever while curving the sliding face of a sleeve which is position on the opposite side to a pinion of said rack. CONSTITUTION:In a steering device, a pinion 5 installed on the shaft end of a steering shaft 3 is engaged with a rack 8 in a gear box 7, driving tie rod 15 by the movement of the rack 8 in the axial direction via a joint 10, an operating rod 12, and a center lever 14 to steer a steering wheel. In this case, the end part of the rack 8 is extended and directly connected to the center lever 14. That is, the joint 10 operating rod 12 and a bush 19 are eliminated. Also, a sleeve 17 which rotatably supports the rack 8 in a position opposite to the pinion 5 across the rack 8 is provided with its sliding face 26 being curved, thereby, allowing the rack 8 to swing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steering device for an automobile.

[Conventional technology]

Engage the pinion on the steering shaft side with the rack,
Regarding the steering device that transmits the displacement of the rack to the tie rod via the center lever, for example,
As shown in Japanese Patent No. 74876, various structures have been devised, and the general structure thereof will be explained with reference to FIGS. 1 and 3 as follows.

A steering shaft 3 is carried by the steering wheel 2, and a pinion 5 attached to the shaft end meshes with a rack 8 within a gear box 7.

The rack 8 is connected to an actuating rod 12 via a joint 10, and the other end of the actuating rod 12 is connected to a tie rod 15 via a center lever 1-4 of a rotating mechanism.

Furthermore, a sleeve 17 is provided in the gear box 7 on the opposite side of the rack 8 from the pinion 5, and is brought into contact with the rack 8. Also, inside the gear box 7, there is a rack 8.
A bushing 19 is provided to support the. That is, the rack 8 is held between the pinion 5 and the sleeve 17, and is inserted through the bush 19, so that by rotation of the pinion 5,
Performs linear reciprocating motion in the E direction.

On the other hand, the connecting portion 2 between the center lever 14 and the actuating rod 12
1 is displaced in a circular arc, the actuating rod 12 connected to the center lever 14 and the rack 8 moves in a complicated manner. Therefore, the rack 8 and the actuating rod 12 are connected by a joint 10 so that the displacement of the rack 8 is transferred to the center lever 14 without any trouble. Furthermore, gear box 7
Rubber boots 23 and 24 are placed over both ends to make the interior deaf-proof and waterproof.

In this structure, a bush 19 is provided in order to move the rack 8 linearly, and a joint 10 is provided in order to transmit the movement of the rack 8 to the center lever 14 having a rotating cylindrical structure.
intervene. Therefore 41! ! The structure becomes more complex, the number of parts increases, and the cost and weight increase. In addition, since the rack 8 slides inside the bush 19, there are various problems such as a large frictional force corresponding to displacement and a fear that the structure may lack rigidity.

[Purpose of the invention]

The present invention is directed to providing a steering device for an automobile that solves the above-mentioned problems.

(Structure of the Invention) The present invention provides a steering device in which a pinion on a steering shaft side is engaged with a rack in a gear box, and the displacement of the rack is transmitted to a tie rod via a center lever. connect directly to
The joint located between the rack and the center lever and the bushing that restrains the swinging of the rack are removed and covered, and the sliding surface of the sleeve that is located on the opposite side of the pinion and contacts the rack is covered. This is a steering device for an automobile, which is curved to allow the rack to swing.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In this embodiment, the end of the rack 8 is extended and connected directly to the center lever 14. That is, the shim pin 10, operating rod 12, and bush 19 described in the conventional example are eliminated, and the rack 8 reciprocates by the rotation of the pinion 5, and also swings in the F direction in response to the rotating center lever 14. , is displaced as shown by the dotted line. and rack 8
The sliding surface 26 of the sleeve 17 that comes into contact with the sleeve 17 is curved as shown by the dotted line in FIG. 2 in order to allow the rack 8 to swing.

Therefore, the rack 8 reciprocates due to the rotation of the pinion 5, and also swings around the sandwiched portion between the pinion 5 and the sleeve 17, and these movements are performed within one plane. Then, the displacement of the rack 8 is transferred to the center lever 14 without any problem.

〔Effect of the invention〕

This invention is as described above, and the joint 10
, the actuating rod 12, and the bushing 19 are eliminated, the structure is simplified, the number of parts is reduced, and costs and il[ are reduced. Since the rack 8 does not slide inside the bushing 19, it has many advantages, such as no frictional force and the M4 construction with increased rigidity.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the gearbox and its surroundings, showing a conventional example and an embodiment of this invention. FIG. 2 is an enlarged explanatory diagram of part A in FIG. 1 showing an embodiment of the present invention. FIG. 2 is a perspective view showing an example steering device. 3... Steering shaft, 5... Pinion,
7... Gear box, 8... Rack, 10...
Joint, 14...Center lever, 17...Sleep, 19...Button, 26...Sliding surface. Patent applicant Fuji Heavy Industries Co., Ltd.! @1Figure 1B3 days

Claims (1)

[Claims] In a steering device in which a pinion on the steering shaft side is engaged with a rack in a gear box and the displacement of the rack is transmitted to a tie rod via a center lever, the rack and the center lever are directly connected, and the rack and the center lever are connected directly. In addition to eliminating the joint located between the levers and the bushing that restrains the swinging of the rack, the sliding surface of the sleeve that is located on the opposite side of the pinion and contacts the rack has been changed to A steering device for an automobile characterized by being curved to allow movement.