JP2003261040A - Steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steering device capable of easily preventing a generation of shimmy and kick back in a vehicle. <P>SOLUTION: A rack/pinion type steering gear 1 of the vehicle is provided with a pinion side housing 2 and a cylindrical housing 3. A reverse U shaped bracket 7 covering an outer periphery surface of the cylindrical housing 3 clamping a bush is fixed to a front cross member 4 by a bolt and a sliding material is provided between the bush and an outer periphery surface of the cylindrical housing 3. A projection 5 of the pinion side housing 2 is fixed to the front cross member 4 by the bolt clamping the bush formed with a bore. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering system for a vehicle, and more particularly to a steering system capable of suppressing the occurrence of shimmy and kickback.

[0002]

2. Description of the Related Art A conventional steering device for a vehicle has a reverse U-shape with bushes sandwiched on the upper surface of a front cross member to which front wheels are connected at both left and right ends in the vehicle width direction. Generally, the steering gear is fixed by a V-shaped bracket, or a protrusion in the vehicle front-rear direction formed on the outer surface of the steering gear is fixed by a bolt.

In this case, the shimmy and kickback vibrations and impacts that occur on the steering wheel can be mitigated by leaving a margin for the steering gear to displace in the vehicle width direction, so that the steering gear is fixed by the former method. In this case, the outer surface of the steering gear should be made slippery with respect to the inner surface of the bush by a slight length in the vehicle width direction.In many cases, the steering gear and the tie rod that transmits the operation of the steering gear to the front wheels are slippery. Since there is a bending angle, the reaction force from the front wheels acts on the steering gear in the vehicle front-rear direction and in the vertical direction, and the displacement of the steering gear in the vehicle width direction with respect to the inner surface of the bush is stopped by the increase in friction force. Therefore, the steering gear housing and the rack etc. housed inside the steering gear housing should not interfere with each other. It may not be possible to prevent shimmy or kickback from occurring due to static displacement.On the other hand, the fixed position of the steering gear may shift in the vehicle width direction due to aging, changing the relative positional relationship between the front wheels and the steering wheel. There was a problem that caused it.

When the steering gear is fixed by the latter method, it is generally difficult to effectively prevent shimmy and kickback because the displacement of the steering gear in the vehicle width direction is restricted. In order to form the protrusion on the tubular portion of the steering gear that accommodates a rack or the like, it is necessary to attach a bracket or the like, and there is a problem that the cost is increased due to an increase in the number of parts.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a steering device which can easily prevent shimmy and kickback in a vehicle.

[0006]

Therefore, a steering device according to the present invention is provided with a bush for covering the outer peripheral surface of the tubular portion of the housing of the steering gear, and for fixing to the cross member of the vehicle by covering the outer peripheral surface of the bush. And a sliding member disposed between the outer peripheral surface of the tubular portion and the inner peripheral surface of the bush.

That is, since the sliding member is arranged between the outer peripheral surface of the tubular portion of the housing of the steering gear and the inner peripheral surface of the bush covering the tubular portion, the steering force is generated by the reaction force from the front wheels. Even if a component force in the vehicle longitudinal direction or vertical direction acts on the gear, increase in frictional force between the outer peripheral surface of the housing tubular portion and the inner peripheral surface of the bush is suppressed. Since the displacement of the tubular portion in the vehicle width direction is relatively easy, it is possible to prevent shimmy or kickback from occurring due to the displacement of the entire steering gear in the vehicle width direction.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, each embodiment of the present invention shown in the drawings will be described with the same reference numerals being given to the same parts.

In FIG. 1, a rack and pinion type steering gear 1 of a vehicle has a pinion side housing 2 and a tubular housing 3 accommodating a rack and the like integrally connected to each other at both left and right ends in the vehicle width direction. It is arranged on the upper surface of the front cross member 4 to which the front wheels are connected, and the pinion-side housing 2 is integrally formed with a protrusion 5 in the vehicle front-rear direction.

At the end of the cylindrical housing 3, as shown in FIGS. 2 and 3, a bush 6 covering the outer peripheral surface thereof is provided.
And an inverted U-shaped bracket 7 that covers the outer peripheral surface of the bush 6, and the bracket 7 is bolted to the front cross member 4. On the other hand, as shown in FIG. 4 and FIG. A collar 13 in which a bush 12 is arranged straddling between the inner cylinder 10 and the outer cylinder 11 is fitted into the bolt hole 8 formed in the protrusion 5, and a protruding portion is formed by a bolt 14 inserted through the inner cylinder 10. By fixing 5 to the front cross member 4, the steering gear 1 is fixed on the front cross member 4, and by the tie rods 15 connected to both ends of the steering gear 1 in the vehicle width direction,
Steering force is transmitted from the steering gear 1 to the front wheels.

Further, a sliding member 20 such as Teflon (registered trademark) woven cloth is attached to the inner peripheral surface of the bush 6, and is disposed between the outer peripheral surface of the tubular housing 3 and the inner peripheral surface of the bush 6. The sliding member 20 is provided, and the bushes 12 are respectively provided at two opposite positions in the vehicle width direction with a curb 21.
Are formed.

That is, since the sliding member 20 is disposed between the outer peripheral surface of the cylindrical housing 3 and the inner peripheral surface of the bush 6, the supporting rigidity of the cylindrical housing 3 in the vehicle width direction is relatively reduced. Therefore, even if a component force in the vehicle front-rear direction or in the vertical direction acts on the steering gear 1 due to the reaction force from the front wheels, the frictional force of the displacement of the tubular housing 3 with respect to the inner peripheral surface of the bush 6 in the vehicle width direction increases. Since this is effectively suppressed, the tubular housing 3 is always easily displaced in the vehicle width direction, and the pinion-side housing 2 is also easily displaced in the vehicle width direction by the currant 21 formed on the bush 12. .

Therefore, the support rigidity of the steering gear 1 in the vehicle width direction is reduced by the cooperation of the above two actions, and the steering gear 1 as a whole is assisted to be displaced in the vehicle width direction. Two
Since the relative displacement between the pinion supported by and the rack or the like housed in the cylindrical housing 3 is suppressed, the occurrence of shimmies and kickbacks can be easily prevented with a simple structure, and the steering stability of the vehicle can be improved. Can improve the
Further, the supporting rigidity of the steering gear 1 in the vehicle width direction is reduced, and the shearing force acting on the bush 6 between the tubular housing 3 and the bracket 7 is significantly reduced, so that the durability of the bush 6 is improved. It is possible to surely improve.

In the steering gear 1, the tubular housing 3 is fixed on the front cross member 4 by a clamp composed of a bush 6 and an inverted U-shaped bracket 7, but the pinion side housing 2 is front bolted by a bolt 14. Since it is fixed on the member 4, the steering gear 1 is prevented from being displaced in the vehicle width direction even if the vehicle is used for a long period of time, and the relative positional relationship between the front wheels and the steering wheel is changed. It is possible to reliably eliminate the risk of

In the embodiment described above, the bushes 12 in the bolt holes 8 in the projecting portion 5 of the pinion-side housing 2 are provided with the curls 21 at two opposite positions in the vehicle width direction. By changing the formation position of the currant 21 as shown in FIGS. 6 and 7, respectively,
Needless to say, even if the displacement of the pinion-side housing 2 in the vehicle width direction is promoted, the same operational effect as that of the above-described embodiment can be achieved.

[0016]

In the steering device according to the present invention, the sliding member is arranged between the outer peripheral surface of the tubular portion of the housing of the steering gear and the inner peripheral surface of the bush covering the tubular portion. However, since the displacement of the housing tubular portion with respect to the bush inner peripheral surface in the vehicle width direction is relatively easy,
Displacement of the entire steering gear in the vehicle width direction can prevent the occurrence of shimmy and kickback, and can easily improve the steering stability of the vehicle.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a main part in an embodiment of the present invention.

2 is an enlarged vertical sectional view taken along line II-II of FIG.

FIG. 3 is a vertical sectional view taken along the line III-III in FIG.

4 is an enlarged vertical cross-sectional view taken along the line IV-IV of FIG.

5 is an enlarged view taken along the line VV of FIG.

FIG. 6 is a view corresponding to FIG. 5 in another embodiment of the present invention.

FIG. 7 is a view corresponding to FIG. 5 in still another embodiment of the present invention.

[Explanation of symbols]

1 steering gear 2 Pinion side housing 3 tubular housing 4 Front cross member 5 Projection 6 bush 7 bracket 12 bush 14 Volts 20 sliding material 21 currant

Claims (3)

[Claims] 1. A bush for covering an outer peripheral surface of a tubular portion of a housing of a steering gear, an inverted U-shaped bracket covering an outer peripheral surface of the bush and fixed to a cross member of a vehicle, and an outer periphery of the tubular portion. A steering device having a surface and a sliding member arranged between the inner peripheral surface of the bush. 2. The vehicle front-rear direction protrusion which is formed integrally with the housing at a distance from the tubular portion in the vehicle width direction, and the bolt hole formed in the protrusion is inserted into the tubular portion. And a bush for fixing the projecting portion to the cross member and a bush formed between the inner surface of the bolt hole and the bolt and having a curled hole. 3. The steering device according to claim 2, wherein the currant is provided at a position that promotes displacement of the housing in the vehicle width direction.