KR101587289B1 - Rack Bar Supporting Structure of Steering Apparatus for Vehicle - Google Patents

Abstract

The present invention prevents noise generated due to mutual impact between components by preventing the gap formed between the conventional housing and the rack bar from being generated while supporting the rack bar to secure a stable and smooth linear sliding movement of the rack bar with respect to the housing And preventing breakage, thereby ultimately improving the durability of the steering apparatus.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rack bar supporting structure of a vehicle steering apparatus,

The present invention relates to a structure for supporting a rack bar of a steering apparatus basically having a rack and pinion operating mechanism.

The rack and pinion type steering apparatus has a structure in which, when a steering operation force of a driver is provided as a pinion through a steering shaft, it is transmitted to left and right steering wheels by a rack bar which is engaged with the pinion and moves to the left and right of the vehicle.

The rack bar and the pinion are installed so as to be engaged with each other in the housing, and the rack bar is installed so as to be linearly movable in the left and right direction within the housing.

1 shows a portion where a rack bar 502 is slidably supported by a conventional housing 500 in a lateral direction. A rack bush 504 is provided in a groove formed in an inner diameter portion of the housing 500, And the rack bar 502 is slidably supported to the left and right through the rack bush 504.

Of course, the rack bushing 504 as described above is designed to allow the rack bar 502 to smoothly slide right and left while maintaining a stable support state with respect to the housing 500. However, Dimensional tolerances between the bushes 504 and the housing 500 and the rack bars 502, and tolerances for securing the assemblability.

Therefore, the clearances between the parts due to the above-mentioned tolerances cause an impact noise during operation, and in the worst case, the damage is caused by the fatigue accumulation of the alternating load, which causes the durability of the steering device to deteriorate.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a rack bar capable of supporting a rack bar so as to secure a stable and smooth linear sliding movement of the rack bar with respect to the housing, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a rack-bar supporting structure of a vehicle steering apparatus which can prevent noise from occurring due to mutual impact between components and prevent breakage, thereby ultimately improving the durability of the steering apparatus.

In order to accomplish the above object, the present invention provides a rack-bar supporting structure of a vehicle steering apparatus,

A housing having an inclined portion whose inner diameter is narrowed along the longitudinal direction of the rack bar at the inner diameter portion;

A rack bush inserted between the rack bar and the housing to be elastically deformed in the radial direction by the inclined portion as the rack bar is moved in the longitudinal direction of the rack bar;

And a control unit.

The present invention prevents noise generated due to mutual impact between components by preventing the gap formed between the conventional housing and the rack bar from being generated while supporting the rack bar to secure a stable and smooth linear sliding movement of the rack bar with respect to the housing And preventing breakage, thereby ultimately improving the durability of the steering apparatus.

1 is a view for explaining a rack bar supporting structure of a vehicle steering apparatus according to the prior art,
2 is a view for explaining a rack bar supporting structure of a vehicle steering apparatus according to the present invention,
FIG. 3 is a view for explaining the rack bushing structure of FIG. 2,
FIG. 4 is a view sequentially showing a process of coupling the rack bush of FIG. 2;
5 illustrates another embodiment of the present invention,
FIG. 6 is a view showing the process of coupling the rack bush of FIG. 5 in order.

2 to 4, an embodiment of the present invention includes a housing 5 having an inclined portion 3 whose inner diameter is narrowed along the longitudinal direction of the rack bar 1 at an inner diameter portion thereof; A rack bush 7 inserted between the rack bar 1 and the housing 5 and being elastically deformed in the radial direction by the inclined portion 3 as it is moved in the longitudinal direction of the rack bar 1 .

The housing 5 is provided with a female screw portion 9 so as to be spaced apart from the inclined portion 3 so that the rack bush 7 is screwed to the housing 5. The rack bush 7 is deformed by the inclined portion 3, And a male screw portion 13 integrally connected to the deformed portion 11 and screwed to the female screw portion 9 is provided.

The deformed portion 11 of the rack bush 7 is formed in such a shape that a plurality of elastic pieces 15 extend from the male screw portion 13 along the longitudinal direction of the rack bar 1, And a plurality of slots 17 are formed in the circumferential direction of the male screw portion 13 between the male screw portions 15.

That is, the elastic pieces 15 constituting the deformed portion 11 by the slot 17 can easily be narrowed in the radial direction. In addition, the elastic pieces 15 have inclined surfaces 19 corresponding to the inclined portions 3, so that the elastic pieces 15 can be deformed while being in smooth surface contact with the inclined portions 3. In addition, the slots 17 allow air to move right and left of the rack bush 7, thereby ensuring smooth operability.

A plurality of nut grooves 21 for screwing the rack bush 7 to the housing 5 are provided at the end of the male screw portion 13 of the rack bush 7.

When the rack bush 7 is inserted between the housing 5 and the rack bar 1 and screwed into the rack 5 as shown in Fig. 2 from the state of Fig. 2, The radius of the deformation portion 11 gradually decreases and the gap between the deformation portion 11 and the rack bar 1 is reduced.

Therefore, the clearance between the rack bar 1 and the rack bar 7 can be adjusted to an appropriate level according to the degree of screwing of the rack bush 7, thereby ensuring the operability of the smooth rack bar 1 It is possible to support the stable and soft rack bar 1.

Of course, there is no unnecessary clearance between the rack bush 7 and the housing 5 due to the screw connection, the pressure between the inclined portion 3 and the inclined surface 19, and the like. Therefore, the conventional inevitable but unnecessary clearances existing between the rack bar 1, the rack bush 7 and the housing 5 are eliminated, noise and breakage due to the impact between the components are prevented, It is possible to obtain an effect of improving the durability of the battery.

FIGS. 5 and 6 illustrate another embodiment of the present invention. The rest of the embodiment is the same as the above embodiment except that the rack bush 7 is divided into two parts.

That is, the rack bush 7 of the embodiment is composed of the deformed portion 11 and the male screw portion 13, and the configuration corresponding to the deformed portion 11 is divided into a rack bush 7 as it is, And the portion corresponding to the portion 13 is the plug 23.

Therefore, the rack bush 7 has a structure in which a plurality of slots 17 are formed in the cylindrical ring along the longitudinal direction of the rack bar 1, and the plug 23 is screwed to the female threaded portion 9 And a male screw is provided on the outer diameter portion so as to press the rack bush 7 into the inclined portion 3.

A plurality of nut grooves 21 are formed at the end of the plug 23 to facilitate screwing to the female screw portion 9 of the housing 5.

The operation and effect of this embodiment are almost the same as those of the embodiment of Figs. 2 to 4, and thus detailed description thereof will be omitted.

One; Lackba
3; Inclined portion
5; housing
7; Rack bush
9; Female thread
11; The deformation part
13; Male thread part
15; Elastic piece
17; slot
19; incline
21; Nut groove
23; plug

Claims (6)

A housing having an inclined portion whose inner diameter is narrowed along the longitudinal direction of the rack bar at the inner diameter portion;
And a rack bush inserted between the rack and the housing to be elastically deformed radially by the slope as the rack is moved in the longitudinal direction of the rack,
The outer side surface of the rack bush is pressed by the inclined portion to be deformed elastically and a deformed portion whose inner side is in close contact with the outer surface of the rack bar is formed,
A plurality of elastic pieces arranged at intervals along the circumferential direction of the rack bar are formed in the deformation part of the rack bush, a plurality of slots are formed along the circumferential direction of the male screw part between the plurality of elastic pieces,
Wherein the rack bush is formed such that its outer diameter becomes smaller toward a front end of the rack bush at a position where the slot is formed and an inner diameter of a portion of the rack bush adjacent to the front end and a distal end of the slot is smaller than the remaining portion. Rack bar support structure of vehicle steering device. The method according to claim 1,
Wherein the housing has a female screw part spaced apart from the inclined part to screw the rack bush;
And a male screw portion integrally connected to the deformed portion and screwed to the female screw portion
And the rack bar support structure of the vehicle steering device. delete The method of claim 2,
And a plurality of nut grooves for screwing the rack bush with the housing are formed at the end of the male screw portion of the rack bush
And the rack bar support structure of the vehicle steering device. The method according to claim 1,
Wherein the housing is provided with a female screw portion at an inner diameter portion spaced apart from the inclined portion;
And a plug screwed to the female threaded portion to press the rack bushing into the inclined portion, the plug having a male screw at the outer diameter portion
And the rack bar support structure of the vehicle steering device. The method of claim 5,
And a plurality of nut grooves are provided on an end portion of the plug so as to facilitate screwing to the female screw portion of the housing
And the rack bar support structure of the vehicle steering device.

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