KR101405698B1

KR101405698B1 - Rack Bar Supporting Device of Steering Apparatus for Vehicle and Steering Apparatus for Vehicle having The Same

Info

Publication number: KR101405698B1
Application number: KR20100045082A
Authority: KR
Inventors: 정재진
Original assignee: 주식회사 만도
Priority date: 2010-05-13
Filing date: 2010-05-13
Publication date: 2014-06-10
Also published as: KR20110125515A

Abstract

The present invention relates to a rack bar supporting device for an automobile steering apparatus and an automobile steering apparatus having the same, and it is an object of the present invention to provide a rack bar supporting device for an automobile steering device that is capable of automatically adjusting a clearance even if wear of a support yoke occurs, Therefore, it is possible to prevent a noise generated due to the support yoke from being applied to the yoke plug due to the reverse input from the irregular road surface due to the increase in the clearance, thereby providing a pleasant steering feeling to the driver.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack bar supporting apparatus for an automotive steering system. More specifically, in a rack bar supporting apparatus of a rack-and-pinion type steering system of an automobile, it is possible to prevent an increase in clearance by automatically adjusting a uniform clearance even if wear of a support yoke occurs after running of an automobile, And more particularly, to a rack bar supporting apparatus for an automobile steering system and a vehicle steering apparatus having such a rack bar supporting apparatus capable of preventing noises generated by the support yoke from being charged at the yoke plug upon an adverse impact input from an irregular road surface or the like.

2. Description of the Related Art [0002] Generally, a steering apparatus is a device for changing the traveling direction of a vehicle according to a driver's will, and is a device for assisting a driver to advance a vehicle in a desired direction by arbitrarily changing a turning center of a front wheel of the vehicle.

1 is a schematic block diagram of a general automotive rack-and-pinion steering system.

As shown in the drawing, the conventional rack-pinion type steering system includes a steering wheel 100 disposed in a driver's seat, a steering shaft 105 connected to the steering wheel 100, a steering column 103 for fixing the steering shaft to the vehicle body, A gear box 130 including a rack gear 110 and a pinion gear 120 for converting the rotational force inputted from the internal gear mechanism 130 into a linear motion, a rack bar 140 having inner ball joints 135 at both ends thereof, And a tie rod 150 formed integrally with the ball of the tie rod 135.

The tie rod 150 is connected to the outer ball joint 155 and transmits a force to the knuckle 159 to steer the tire 158.

2 is a sectional view of a conventional rack bar supporting device.

As shown, the conventional rack bar supporting device includes a pinion gear 120, a rack bar 140, a support yoke 260, a spring 263, and a yoke plug 265. The rack-pinion type gear box 130 converts the rotational force input from the steering shaft (not shown) into linear motion as described above.

The rack bar 140 is engaged with the pinion gear 120 so as to convert rotational motion into rectilinear motion. The rack bar 140 is fixed to the rear surface of the rack bar 140 so that the rack bar 140 and the pinion gear 120 can be properly engaged with each other. And a device for supporting the pinion gear 120 to the pinion gear 120 side.

The support yoke 260 includes a rack gear 110, which is a rear surface of the rack bar 140. The support yoke 260 includes a support yoke 260, a spring 263, and a yoke plug 265. (See FIG. 1), and is inserted into the cylinder 250 of the gear box 130 and is movable in the front-rear direction perpendicular to the rack bar 140.

The shape of the support yoke 260 is a cylindrical shape so as to be slidable forward and backward in the cylinder 250 and a front portion contacting with the rack bar 140 forms a semicircular groove so as to be in close contact with the rear surface of the rack bar 140.

A spring 263 is disposed at the rear of the support yoke 260 so that the rack bar 140 and the pinion gear 120 can closely contact each other and effectively transmit the force to push the support yoke 260 at a constant pressure, And the pinion gear 120 can be compensated for.

The support yoke 260 is slidingly frictionally engaged with the rear surface of the rack bar 140 so that friction between the support yoke 260 and the support yoke 260 causes the rack bar 140 to be worn or noise- A support yoke 260 is used.

The spring 263 received in the spring groove 220 functions to apply pressure to the support yoke 260 so that the support yoke 260 closely contacts the rack bar 140. A coil spring is generally used and a yoke plug (265) is positioned to support the spring (263).

The yoke plug 265 supports the spring 263 to apply pressure to the support yoke 260. The yoke plug 265 is formed with a thread and a valley and is adapted to engage with the gear box 130 and the lock nut 240 having threads and teeth formed therebetween. (Not shown).

However, in such a conventional rack bar supporting device, there is a problem that when the support yoke progresses to some extent, the clearance is increased and the rack bar can not be properly supported, and there is a problem that rattle noise is generated in the support yoke and the yoke plug there was.

Such a conventional rack bar support device has a problem that when the support yoke supporting the rack bar contacts with the rack bar, the rattle noise is generated due to the wear due to the wear, and the rack bar is not properly supported.

In addition, the spring coupled to compensate for the clearance also has a problem in that the noise is increased even when the same impulse is applied due to the tension of the spring because the displacement of the spring is increased by an increased clearance when the clearance due to wear of the support yoke occurs.

SUMMARY OF THE INVENTION The present invention has been conceived to solve such a problem, and it is an object of the present invention to provide a motorcycle capable of preventing a clearance from being increased by automatically adjusting a uniform clearance even when wear of a support yoke occurs after running of an automobile, And it is an object of the present invention to provide a rack bar supporting apparatus of a vehicle steering apparatus which can prevent a noise generated when a support yoke is hit by a yoke plug against an impact that is reversely input from a back yoke.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a gear box comprising: a support yoke inserted into a cylinder of a gear box to support a rear surface of the rack bar; A support damper in which a front surface supports the support yoke forwardly and is elastically deformed by filling a fluid therein; And a yoke plug which supports the rear surface of the support damper forward and is coupled to the gear box cylinder.

According to another aspect of the present invention, there is provided a gear box comprising: a steering shaft connected to a steering wheel; a gear box having a rack gear and a pinion gear for converting a rotational force inputted from the steering shaft into a linear motion; The rack bar supporting device includes a support yoke inserted into a cylinder of a gear box to support a rear surface of the rack bar; A support damper in which a front surface supports the support yoke forwardly and is elastically deformed by filling a fluid therein; And a yoke plug which supports the rear surface of the support damper forward and is coupled to the gear box cylinder.

According to the present invention, it is possible to prevent the clearance from being increased by automatically adjusting the clearance even if wear of the support yoke occurs after the driving endurance of the automobile has progressed, and it is possible to prevent the support yoke from being impacted by an irregular road surface It is possible to prevent the noise generated by charging the yoke plug, thereby providing a pleasant steering feeling to the driver.

1 is a schematic block diagram of a general automotive rack-and-pinion steering system.
2 is a sectional view of a conventional rack bar supporting device.
Figs. 3, 4 and 5 are cross-sectional views of a rack bar supporting apparatus of an automobile showing various embodiments of the present invention. Fig.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

In the detailed description of the present invention, the direction of the rack bar in front of the support yoke will be referred to as forward and the support yoke in the opposite direction will be referred to as rear in order to simplify the description.

Figs. 3, 4 and 5 are cross-sectional views of a rack bar supporting apparatus of an automobile showing various embodiments of the present invention. Fig.

As shown in these drawings, the rack bar supporting apparatus according to the embodiments of the present invention includes a support yoke 330 inserted into the cylinder 250 of the gear box 130 and supporting the rear face of the rack bar 140; A support damper 320 having a front surface supporting the support yoke 330 forward and being elastically deformed by being filled with fluid; And a yoke plug 310 that supports the rear surface of the support damper 320 forward and is coupled to the gear box 130 cylinder 250.

The support yoke 330 coupled to the cylinder 250 of the gear box 130 is brought into close contact with the rear surface of the rack bar 140 to be engaged with the pinion gear 120 to prevent the coupling between the rack bar 140 and the pinion gear 120 Thereby supporting the rack bar 140 forward.

The support yoke 330 supports the support yoke 320 such that the support bar 330 and the pinion gear 120 are in close contact with each other to effectively absorb impact transmitted through the rack bar 140 from the road surface, The pinion gear 120 and the rack bar 140 are rotated in the forward and backward directions to compensate for the gap generated between the rack bar 140 and the pinion gear 120.

That is, the support yoke 330 is inserted into the cylinder 250 of the gear box 130 so as to closely support the rear surface of the rack bar 140 on the front surface thereof and compensate the clearance of the rack bar 140 and the pinion gear on the rear surface thereof A support damper 320 is coupled to absorb shock.

Here, the support yoke 330 may be formed concavely or convexly in the center of the rear surface so that the support yoke 330 can be supported by the support damper 320 when the rack bar 140 is operated.

The support damper 320 which is coupled to the cylinder 250 of the gear box 130 and supports the support yoke 330 forwardly is filled with fluid to compensate for the clearance between the rack bar 140 and the pinion gear, The inner fluid absorbs the impact transmitted through the inner tube 140.

As the fluid to be filled in the support damper 320, a gas such as air or an inert gas, or a liquid such as oil or water may be used. Preferably, a compressible fluid is used.

The support damper 320 includes a yoke support plate 323, a plug support plate 325 and a damping member 327. The damping member 327 is filled with the fluid as described above, And absorbs the shock transmitted through the first hinge 140.

The yoke support plate 323 of the support damper 320 is supported on the rear surface of the support yoke 330. When the impact is transmitted through the rack bar 140 when the vehicle is traveling, The center of the front face may be formed concave or convex so as to correspond to the rear face of the support yoke 330 so as to facilitate the rotation.

The plug support plate 325 of the support damper 320 is supported on the front surface of the yoke plug 310 and supports the yoke plug 310 when the impact is transmitted through the rack bar 140 when the vehicle is running. The center portion of the rear surface may be concave or convex so as to correspond to the front surface of the yoke plug 310 so as to facilitate deformation.

The damping member 327 is fused or press-coupled with the yoke support plate 323 and the plug support plate 325 so as to fill the fluid therein. The yoke support plate 323 and the damping member 327, or by rolling and pressing the plug supporting plate 325 and the damping member 327.

However, the coupling structure of the damping member 327, the yoke support plate 323, and the plug support plate 325 shown in the figure is merely an example and is not limited thereto, and in some cases, the yoke support plate 323 The damping member 327 may be rolled and pressed or the plug supporting plate 325 and the damping member 327 may be fused.

The yoke support plate 323 and the plug support plate 325 of the support damper 320 are made of a steel material or a plastic material and the damping member 327 is made of NR (Natural Rubber) so as to have weatherability, stretchability, Polybutadiene rubber (BR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene propylene terpolymer (EPDM), fluoroelastomer (FPM), chlorosulphonated polyethylene (CSM) And the like.

The support damper 320 is disposed between the damping member 327 and the damping member 327 so as to prevent the lowering of the support force of the rack bar 140 due to excessive deformation when the impact is transmitted from the road surface through the rack bar 140, The reinforcing yarn 329 can be coupled between the inner circumferential surface and the outer circumferential surface.

The reinforcing yarn 329 is formed of a fiber or a metal wire and may be integrally formed when the damping member 327 made of an elastic material is formed.

3, a damper spring 340 may be inserted between the yoke support plate 323 and the plug support plate 325 to couple the support damper 320 with the damper spring 340 So that the supporting force of the rack bar 140 is generated and at the same time the rigidity of the damping member 327 is increased so that the damping function and the gap compensation function of the rack bar 140_ can be performed together with the fluid filled inside.

4, a yoke spring 410 may be coupled between the rear surface of the support damper 320 and the front surface of the yoke plug 310 to support the support damper 320 forward. Both the yoke spring 410 and the damper spring 340 may be provided.

Accordingly, such structures support the support yoke 330 forward while absorbing external shock transmitted through the rack bar 140. [

1, the rack bar supporting apparatus includes a steering wheel 100, a steering shaft 105 connected to the steering wheel 100, and a rack gear 110 for converting a rotational force input from the steering shaft 105 into a linear motion. A gear box 130 including a pinion gear 120 and a gear box 130 and a rack bar supporting device coupled to the gear box 130 to support the rack bar 140. [

According to the present invention having such a structure and shape, it is possible to prevent the clearance from being increased by automatically adjusting the clearance even if wear of the support yoke occurs after the running endurance of the automobile has progressed, and it is possible to prevent an increase in clearance from irregular road surfaces It is possible to prevent the noise generated by the support yoke from being charged by the yoke plug against the input shock, thereby providing a pleasant steering feeling to the driver.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

310: yoke plug 320: support damper
323: yoke support plate 325: plug support plate
327: damping member 329:
330: Support yoke 340: Damper spring
410: yoke spring

Claims

A support yoke inserted into a cylinder of the gear box to support a rear surface of the rack bar;
A support damper in which a front surface supports the support yoke forwardly and is elastically deformed by filling a fluid therein; And
And a yoke plug which supports the rear surface of the support damper forward and is coupled to the gear box cylinder,
In the support damper,
A yoke support plate supported on a rear surface of the support yoke;
A plug supporting plate supported on a front surface of the yoke plug; And
A damping member of an elastic material which is hermetically coupled to the yoke support plate and the plug support plate and is filled with a fluid;
Wherein the rack bar supporting device comprises:

delete

The method according to claim 1,
Wherein the support damper is provided with a reinforcing yarn that is coupled between an inner circumferential surface and an outer circumferential surface of the damping member to maintain the rigidity of the damping member.

The method of claim 3,
Wherein the reinforcing yarns are formed of fibers or metal wires.

The method according to claim 1,
And a yoke spring which is coupled between a rear surface of the support damper and a front surface of the yoke plug and supports the support damper forwardly.

The method according to claim 1,
And a damper spring inserted between the yoke support plate and the plug support plate to support the support yoke forwardly.

A steering gear connected to the steering wheel, a gear box having a rack gear and a pinion gear for converting a rotational force inputted from the steering shaft into a linear motion, and a rack bar supporting device coupled to the gear box to support the rack bar. In this case,
The rack bar supporting device includes:
A support yoke inserted into a cylinder of the gear box to support a rear surface of the rack bar;
A support damper in which a front surface supports the support yoke forwardly and is elastically deformed by filling a fluid therein; And
And a yoke plug which supports the rear surface of the support damper forward and is coupled to the gear box cylinder,
In the support damper,
A yoke support plate supported on a rear surface of the support yoke;
A plug supporting plate supported on a front surface of the yoke plug; And
A damping member of an elastic material which is hermetically coupled to the yoke support plate and the plug support plate and is filled with a fluid;
And a steering angle sensor for detecting steering angle of the steering wheel.

delete

8. The method of claim 7,
Wherein the support damper is provided with a reinforcing yarn that is coupled between an inner circumferential surface and an outer circumferential surface of the damping member to maintain rigidity of the damping member.

10. The method of claim 9,
Wherein the reinforcing yarns are formed of fibers or metal wires.

8. The method of claim 7,
And a yoke spring coupled between a rear surface of the support damper and a front surface of the yoke plug to support the support damper forward.

8. The method of claim 7,
And a damper spring inserted between the yoke support plate and the plug support plate to support the support yoke forwardly.