KR960010216B1 - Anti-shimmy device for a power steering system - Google Patents

Abstract

The apparatus prevents the shimmy phenomenon caused by a hydraulic pressure continuously increased on a full left steering or right steering. The apparatus comprises a spline shaft(11), rotating with a steering column and having a longitudinal spline; a lower fixture(15), combined with the spline of the shaft(11) and having a circumferential screw(16) and a stopper(20); a variable member(18), screwed with the screw(16) of the lower fixture(15) and having a plurality of guide protrusions(24) and an upward/downward protrusion(22,23); an upper fixture(19), combined with the spline of the lower fixture(15); a housing(10) having a guide groove(25) for making the guide protrusions inserted into.

Description

Anti-shake device of power steering

1 is an exploded perspective view of the anti-shake device according to the invention.

2 is a cross-sectional view of the anti-shake device according to the present invention.

3 is a perspective view showing a state in which the anti-shake device according to the present invention is installed.

4 is a view illustrating a rack pinion type power steering device.

* Explanation of symbols for main parts of the drawings

10 housing 11 spline shaft

14 support member 15 lower fixing member

16: screw portion 18: variable member

19: upper fixing member 20, 21: stopper

22, 23: protrusion 24: guide protrusion

25: guide groove 27: fastening member

The present invention relates to an anti-shake device of a power steering device, and more particularly, to a power steering device capable of preventing vibration caused by hydraulic pressure continuously flowing in a completely left or right direction.

The steering device of the vehicle includes an operation mechanism for transmitting the operating force to the steering gear and the link to change the traveling direction, a gear device for increasing the operating force by reducing the rotation of the steering shaft, and changing the direction of movement of the operation mechanism to the link mechanism; In addition, it includes link mechanisms that transmit the operation of the gear mechanism to the front wheels and correctly support the relation positions of the left and right wheels.

This steering apparatus is largely divided into a worm sector type, a bowl nut type, a variable gear ratio type, and a rack pinion type according to a structure for transmitting the rotational force of the steering shaft to the front wheels.

Among the steering devices described above, the rack pinion type has the advantages of being smaller and lighter than other types of steering devices. However, since the impact from the road surface is easily transmitted to the handle, the rack pinion spring is installed so that it can be returned in any direction. In addition, a rack guide is attached to the handle to stabilize the friction between the rack and the pinion.

This steering system uses a power steering system to lighten the operating force. This method sends hydraulic pressure from the oil pump that operates the engine to the power unit installed in the middle of the steering unit to reduce the operating force. It is structured.

4 is a view illustrating a rack pinion type power steering device, in which a pinion, which is coupled by a steering shaft 1 and a joint 2 and rotates together in a rotational direction of the shaft, is supported by the pinion. And a housing (4) having a built-in rack cylinder for linearly moving left and right, a valve for introducing hydraulic pressure generated by the hydraulic pump into the left or right port of the power cylinder (3), It comprises a tie rods (5) (6) which extend to the left and right of the rack gear located in the power cylinder (3).

In the power steering device, the rack gear moves as the steering shaft 1 rotates to push or pull the tie rods 5 and 6. At this time, the valve in the housing 4 operates to operate the steering shaft 1. The inflow direction of the hydraulic pressure is changed to push the tie rod in the steering direction.

Therefore, the rack gear is pushed in addition to the force of the hydraulic pressure to lighten the operating force, this type of power steering device is driven by the hydraulic pump is driven even when the steering shaft (1) is rotated to the full steering or right direction. 3) Inflow continues to occur.

Therefore, the pressure increases in the power cylinder 3, but because the rack gear is no longer movable by the stopper, vibration is transmitted to the steering shaft by hydraulic pressure applied to the rack gear, and noise is generated. There is this.

The present invention has been invented to solve the above structural problems, and an object of the present invention is to provide an anti-shake device of a power steering device that can prevent the shaking and noise generation of the steering wheel.

In order to realize this, the present invention is a spline shaft which is integrally rotated with the steering shaft and has a spline formed in the longitudinal direction, and is fixed to a lower side which is coupled to the spline of the shaft and has a screw portion formed on the outer circumferential surface thereof, and a stopper formed on the lower side thereof. The member is screwed to the threaded portion of the member, and a plurality of guide protrusions are formed on the outside, the variable member having protrusions protruding up and down, splined to the upper end of the lower fixing member and a stopper is formed on the outside. An upper fixing member and a guide groove into which the guide protrusion of the variable member is inserted are formed on an inner side thereof, and provide an anti-shake device of a power steering apparatus including a housing installed as a non-rotating member.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of the anti-shake device according to the present invention, and FIG. 2 is a sectional view of the coupling, which is a housing 10 and a spline shaft 11 which is located inside the housing 10 and rotates together in a steering direction of a steering shaft. , The length of the shaft 11 is made larger than the length of the housing 10.

The spline shaft 11 has a lower end where no spline is formed, and a groove 13 to which the ring 12 is fixed is formed, and the spline shaft 11 is fitted to the lower end by the ring 12 fixed thereto. The supporting member 14 does not move downward.

The lower fixing member 15 fitted to the spline shaft 11 while being mounted on the supporting member 14 has a threaded portion 16 formed on an outer circumferential surface thereof, and on the upper side of the screwed portion 16, a splined portion ( 17) is formed.

The variable member 18 is screwed to the screw portion 16 to move up and down along the screw thread, and the upper fixing member 19 is fitted to the spline portion 17.

The stopper 20 is integrally protruded from one position on the lower fixing member 15, and one stopper 21 is integrally protruding from the upper fixing member 19.

These stoppers 20, 21 are in contact with the projections 22, 23 formed on the upper and lower sides of the variable member 18 at a constant position when the variable member 18 moves up and down simultaneously with the rotation of the screw portion 16. Allow it to stop.

The variable member 18 is screwed to the threaded portion 16 of the lower fixing member 15 will be moved up and down if the lower fixing member 15 does not rotate together when rotated in place.

Therefore, the rotation of the variable member 18 should be suppressed. For this purpose, at least one guide protrusion 24 is installed outside the variable member 18 so that the guide protrusions 24 are formed on the inner circumferential surface of the housing 10. The housing 10 may be made into a non-rotating body so that the guide groove 25 is inserted into the guide groove 25.

The upper fixing member 19 together with the lower fixing member 15 should not move on the spline shaft 11. For this purpose, the upper fixing member 19 is formed to form a threaded portion 26 upwards where the upper fixing member 19 is located. The fastening member 27 is screwed to the 26 to fix it.

The anti-shake device of the present invention thus formed may be integrally formed above the pinion gear so that the spline shaft 11 may rotate by the steering shaft, and may be installed on the universal joint or the steering shaft.

And the housing 10 is fixed to the vehicle body or fixed to the steering shaft column is installed as a non-rotating body.

Accordingly, when the driver turns the steering wheel, the spline shaft 11 connected to the steering shaft rotates to rotate.

Since the lower fixing member 15 is splined to the rotating spline shaft 11, the lower fixing member 15 also rotates together, and the variable member 18 coupled to the threaded portion 16 of the member is rotated. Because the guide protrusion 24 of the non-rotating body is fitted in the guide groove 25 of the inner surface of the housing 10, the variable member 18 is not rotated.

Therefore, the variable member 18 is in a state of not rotating, and the lower fixing member 15 is in a state of rotating. Due to this action, the variable member 18 is arranged up and down along the spiral direction of the screw thread formed on the threaded portion 16. Will be moved to.

That is, the rotational force of the lower fixing member 15 rotating by the rotational force of the steering shaft causes the variable member 18 to linearly move.

The variable member 18 is moved up and down by this action, and when moved downward, the protrusion 22 is blocked by the stopper 20 of the lower fixing member 15, and conversely, when the protrusion 23 is moved upward, the protrusion 23 is moved. Since it is blocked by the stopper 21 of the upper fixing member 19, it can no longer rotate.

This action shortens the stroke of the rack gear, which is geared to the pinion by the steering operation of the steering wheel and moves from side to side in the cylinder.

Therefore, the rack gear is in close proximity to the stopper in the power cylinder, but it does not come into contact with it, and when the steering shaft rotates, the torsion bar that rotates and returns to its original position, the hydraulic pressure generated from the hydraulic pump It goes back without entering.

In this way, the anti-shake device according to the present invention does not come into contact with the stopper even when the rack gear is completely steered in the left or right direction, so that the noise generated by the rack gear of the conventional power steering device is in contact with the stopper. It can prevent the trembling caused.

Claims (3)

A spline shaft 11 which is integrally rotated with the steering shaft and has a spline formed in the longitudinal direction, and a screw 16 is formed on the outer circumferential surface of the spline of the shaft, and a stopper 20 is formed on the lower side thereof. Variable member 18, which is screwed to the fixing member 15 and the threaded portion 16 of the member, a plurality of guide protrusions 24 are formed on the outside and have protrusions 22, 23 protruding up and down. And an upper fixing member 19 having a splice coupled to an upper end of the lower fixing member 15 and having a stopper 21 formed therein, and a guide protrusion 24 of the variable member 18 inserted therein. The guide groove 25 is formed on the inner surface and the anti-vibration device of the power steering device comprising a housing 10 is installed as a non-rotating body. The anti-shake device of claim 1, wherein a screw portion (26) is formed on the spline shaft (11) so that the fastening member (27) is coupled thereto. The anti-shake device of claim 1, wherein the support member (14) is fixed to the spline shaft (11).