KR101793819B1 - Rack Bush of Steering Apparatus for Vehicle - Google Patents

Rack Bush of Steering Apparatus for Vehicle Download PDF

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Publication number
KR101793819B1
KR101793819B1 KR1020160029564A KR20160029564A KR101793819B1 KR 101793819 B1 KR101793819 B1 KR 101793819B1 KR 1020160029564 A KR1020160029564 A KR 1020160029564A KR 20160029564 A KR20160029564 A KR 20160029564A KR 101793819 B1 KR101793819 B1 KR 101793819B1
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KR
South Korea
Prior art keywords
rack
groove
bush
circumferential surface
bush body
Prior art date
Application number
KR1020160029564A
Other languages
Korean (ko)
Other versions
KR20170106580A (en
Inventor
연제현
Original Assignee
주식회사 만도
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020160029564A priority Critical patent/KR101793819B1/en
Publication of KR20170106580A publication Critical patent/KR20170106580A/en
Application granted granted Critical
Publication of KR101793819B1 publication Critical patent/KR101793819B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B62D3/126—Steering gears mechanical of rack-and-pinion type characterised by the rack
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/20—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application
    • B62D5/22—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application for rack-and-pinion type

Abstract

An embodiment of the present invention is a cylindrical bush body including a grease groove formed as an axial groove on an inner circumferential surface thereof and having at least one incision portion having an inner circumferential surface and an outer circumferential surface in an axial direction so as to open at one end, And at least one elastic member coupled to or integrally formed with an outer peripheral surface of the rack bush.

Description

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

More particularly, the present invention relates to a rack bush, and more particularly, to a rack bush of an automotive steering device that supports load in a direction perpendicular to the axial direction of the rack bar to reduce abnormal wear of the rack bush, To a rack bush of an automotive steering system capable of reducing rattle noise due to an external force transmitted thereto and preventing damage to rack bars and pinion shafts by distributing loads due to external impacts.

Generally, a steering apparatus is provided between a driver's seat and a wheel so as to allow a driver to move the wheel. The steering apparatus includes a steering shaft provided below a steering wheel of a driver's seat, a gearbox connected to the steering shaft, And a rack bar extending to left and right sides so as to be able to operate directly.

1 is a partial sectional view showing an automotive steering system according to the prior art.

As shown in FIG. 1, a gear box 125 connected to the rack housing is provided on the side of the steering wheel 110 and the steering shaft 115 below the steering wheel 110.

An input shaft 120 is provided on the upper side of the gear box 125 so as to be connected to the steering shaft 115 to receive the rotational force generated from the steering wheel 110.

The gear box 125 is provided with a pinion (not shown) which is rotated by a rotational force transmitted through the input shaft 120 and formed with teeth on the outer periphery of the gear box 125, A rack housing 137 formed integrally and extending to both sides is provided.

The rack housing 137 is formed as a hollow tube with both sides opened. One side of the opening is provided with a rack bush 160 and a rack stopper 165, and a bellows 150 is provided on the outer periphery thereof.

The rack housing 137 is provided with a rack bar 140 having a rack formed therein so as to be coupled with a pinion provided in the gear box 125.

The rack bar 140 is provided so as to be linearly moved in the axial direction within the rack housing 137 and has a rack formed in the middle thereof so as to be able to be engaged with the pinion of the gear box 125, And the left and right sides are connected to the tie rod 155 via the inner ball joint to which the balls are inserted and coupled to the ball housing 175 to steer the wheels.

A rack bush 160 is provided at one side of the opened rack housing 137 to guide the movement of the rack bar 140 while supporting the rack bar 140.

The rack bush 160 is hollow and the outer circumferential surface of the rack bush 160 closely contacts the inner circumferential surface of the rack housing 137 and the step portion 135. The inner circumferential surface of the rack bush 160 closely contacts the outer circumferential surface of the rack 140, And the rack stopper 165 is press-fitted into the rack housing 137 at the other opposite end.

A rack stopper 165 is provided at the end of the rack bushing 160 so as to be hermetically closed so that the rack housing 137 can be hermetically closed and tightly fixed to the inner circumferential surface of the rack housing 137 while being in close contact with the rack bushing 160. Thereby preventing the rack bush 160 from coming off.

The conventional rack bushing has a problem in that when the driver steers the steering wheel, loads in the axial direction and the vertical direction of the rack bar are transmitted through the rack bar, the rack bush, and the rack housing, resulting in abnormal wear and noise of the rack bush.

Also, since the rack bushes can not smoothly support the loads in the axial direction and the vertical direction of the rack bar, there is a problem that the rack bars and the pinion shafts are damaged due to the impact transmitted from the outside through the road surface.

In order to solve these problems, the present invention smoothly supports the axial and vertical loads of the rack bar to reduce abnormal wear of the rack bar, reduce rattle noise due to external force transmitted through the rack bar during movement of the rack bar, And it is an object of the present invention to provide a rack bush of an automotive steering system capable of preventing damage to rack bars and pinion shafts by distributing loads due to impact.

Further, the objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, according to an embodiment of the present invention, there is provided an internal combustion engine including a cylindrical body having an inner circumferential surface formed with a grease groove formed as an axial groove and having an inner peripheral surface in an axial direction and at least one cut- And at least one elastic member coupled to or integrally formed with the outer circumferential surface of the bush body.

According to the embodiment of the present invention, the load in the axial direction and the vertical direction of the rack bar can be smoothly supported, thereby reducing the abnormal wear of the rack bush. Rattle noise due to external force transmitted through the rack bar during movement of the rack bar can be reduced, So that damage to the rack bar and the pinion shaft can be prevented.

1 is a partial cross-sectional view showing a conventional automotive steering apparatus,
2 is a perspective view showing a rack bush of an automotive steering system according to an embodiment of the present invention,
3 and 4 are sectional views showing a rack bush of an automotive steering system according to an embodiment of the present invention,
5 is a sectional view showing a rack bush of an automotive steering system according to an embodiment of the present invention.

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 numerals whenever 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."

Fig. 2 is a perspective view showing a rack bush of an automotive steering system according to an embodiment of the present invention, Figs. 3 and 4 are sectional views showing a rack bush of an automotive steering system according to an embodiment of the present invention, Fig. Sectional view showing a rack bush of an automotive steering system according to an example.

As shown in these drawings, the rack bush 200 according to the embodiment of the present invention is provided with a grease groove 207 formed on its inner circumferential surface as an axial groove, and has an inner circumferential surface and an outer circumferential surface in the axial direction A cylindrical bush body 201 having at least one incised cutout 209 and at least one elastic member 205 joined to or integrally formed with the outer circumferential surface of the bush body 201.

The rack bar 140 is reciprocated axially inside the rack housing 137 to convert the rotational motion of the steering shaft into a linear motion and the left and right ends of the rack bar 140 are connected to the ball housing (see 175 in FIG. 1) (Refer to 155 in Fig. 1) via an inner ball joint to which a ball is inserted and coupled to steer the wheel.

In the rack housing 137, when the driver steers the steering wheel, the rack bar 140 coupled to the pinion of the steering shaft linearly reciprocates left and right in the rack housing 137.

The rack bush 200 is coupled to the inside of the rack housing 137 and has a hollow tube shape so that the rack bar 140 can be inserted and coupled to the inner peripheral surface of the rack housing 140 to linearly move the rack bar 140.

At this time, the rack bar 140 is supported by the rack bush 200 coupled to the inside of the rack housing 137, and performs a linear reciprocating movement. In the rack bush 200 according to the embodiment of the present invention, A cutout portion 209 having an inner circumferential surface and an outer circumferential surface is provided so as to have a groove 207 and to be elastically deformed to be self-contracted and relaxed when assembled to the rack housing 137, The noise is reduced and the rack bush 200 is brought into close contact with the rack bar 140 to prevent noise due to the gap with the rack bar 140.

Since the elastic member 205 is coupled to the outer circumferential surface of the bush body 201 so as to be integrally formed with the outer circumferential surface of the bush body 201, a load that is displaced due to the reciprocating motion of the rack bar 140 is generated, The elastic member 205 elastically deforms while being transmitted, absorbing the load to prevent noise, and at the same time, can be fixed without being detached from the rack housing 137.

The cutouts 209 are spaced circumferentially and may include at least one of the cutouts 209. When two or more cutouts 209 are provided, the cutouts 209 are arranged at equal intervals in the circumferential direction, So that the deformation can be uniformly performed over the entire area.

It is noted that these cut-out portions 209 are shown by way of example in the figures of the present invention in which three are formed at equal intervals in the circumferential direction.

The protrusion 203 protruding from the outer periphery of the bush body 201 is provided at the opposite side of the opening of the cutout 209 to increase the rigidity of the portion opposite the opening due to the cutout 209, Excessive deformation in the elastic deformation of the spring member 201 is prevented and damage is prevented from occurring.

The protrusion 203 is engaged with the latching groove 202 of the rack housing 137 when the rack housing 137 is coupled to the rack housing 137 so that the protrusion 203 can be fixed without being disengaged during linear movement of the rack bar 140 in the axial direction.

The grease groove 207 formed on the inner circumferential surface of the bush body 201 is connected to both ends of the bush body 201 to secure a passage of grease from one end to the other end of the bush body 201, The grease is smoothly supplied during the linear motion of the rotor 140.

The grease grooves 207 may be spaced apart from each other in the circumferential direction and may include two or more grease grooves 207. In the drawings of the present invention, a plurality of grease grooves 207 are provided at predetermined intervals in the circumferential direction.

At least one elastic member 205 integrally formed with the outer circumferential surface of the bush body 201 is provided. When two or more elastic members 205 are provided, the elastic members 205 are arranged at equal intervals in the circumferential direction.

A seating groove 201a on which an elastic member 205 is seated is provided on the outer circumferential surface of the bush body 201 so that a load is applied to the bush body 201 in either axial direction during linear movement of the rack bar 140 The elastic member 205 can be elastically deformed without releasing to the side where the load is transferred.

The elastic member 205 may be coupled to the seating groove 201a of the bush body 201 by bonding or press fitting and the elastic member 205 may be inserted into the seating groove 201a of the bush body 201, And may be integrally formed by injection.

Particularly, when the elastic member 205 is integrally formed by being injected into the seating groove 201a of the bush body 201, the manufacturing cost and the assembly ratio are reduced, and the scattering of the engagement position of the elastic member 205 is reduced, The elastic modulus can be uniformly generated in the radial direction.

The mounting groove 201a of the bush body 201 may have a fixing groove 201b recessed radially inward from the bottom surface of the mounting groove 201a. A fixing protrusion 205a having a shape corresponding to the fixing groove 201b may be formed by double injection.

When the fixing groove 201b is formed in the seating groove 201a and the fixing protrusion 205a is formed on the elastic member 205 so that the load in the axial direction is transferred to the bush body 201 during linear movement of the rack bar 140 It is possible to prevent the elastic member 205 from being separated from the elastic member 205 and to restore the elastic member 205 when the elastic member 205 is elastically deformed.

Since the bush body 201 according to the embodiment of the present invention is brought into close contact with the rack bar 140 and the rack housing 137 to generate sliding movement, the bush body 201 is provided with not only abrasion resistance and low friction but also predetermined bending and rigidity, (POM), polyamide (PA), polycarbonate (PC), polyimide (PI), and polybutylene terephthalate (PBT) Or synthetic resin such as natural rubber or polyester elastomer (PE).

In addition, the elastic member 205 according to the embodiment of the present invention is formed of an elastic material such as urethane, natural rubber material, polyester elastomer (PE) or the like.

The rack bushing 200 as described above includes a rack housing 137 to which the rack bushing 200 is coupled inwardly and a rack housing 137 that is meshed with the pinion and is supported on the inner circumferential surface of the rack bushing 200, And a rack bar 140 for converting the rotary motion of the steering shaft into a linear motion while reciprocating, thereby constituting a rack-and-pinion type steering apparatus for an automobile.

According to the present invention having such a structure and a shape, it is possible to smoothly support the load in the axial direction and the vertical direction of the rack bar to reduce the abnormal wear of the rack bush and to reduce the rattle noise due to the external force transmitted through the rack bar during the movement of the rack bar. And the load caused by the external impact can be dispersed, thereby preventing damage to the rack bar and the pinion shaft.

In addition, according to the embodiment of the present invention, it is possible to minimize impact caused by reverse input from the road surface, reduce wear and vibration, and reduce noise.

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. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

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 within the scope of equivalents should be construed as falling within the scope of the present invention.

200: Rack bush according to the embodiment of the present invention
201: Bush body 201a: seat home
201b: fixing groove 202: latching groove
203: protrusion 205: elastic member
205a: Fixing projection 207: Grease groove
209:

Claims (7)

A cylindrical bush body having a grease groove formed as an axial groove on an inner circumferential surface thereof and having at least one incision portion having an inner circumferential surface and an outer circumferential surface in an axial direction so as to open at one end;
And at least one elastic member coupled or integrally formed with the outer circumferential surface of the bush body,
A protrusion formed to protrude to the outer circumference side of the bush body is provided at the opposite end of the cut portion to prevent excessive deformation when the bush body is elastically deformed by increasing the rigidity of the end portion opposite to the opening due to the cut portion, The rack bush of the automotive steering system. The method according to claim 1,
And the grease groove is formed to be connected to both ends of the bush body. 3. The method of claim 2,
Wherein the grease groove is spaced apart in the circumferential direction and two or more grooves are provided. The method of claim 3,
Wherein the elastic members are spaced apart from each other in the circumferential direction and have at least two circumferentially spaced circumferentially spaced equal intervals. 5. The method of claim 4,
And a mounting groove on which the elastic member is seated is provided on an outer circumferential surface of the bush body. 6. The method of claim 5,
Wherein the elastic member is integrally formed by being double injected into a seat groove of the bush body. The method according to claim 6,
Wherein the seating groove is formed with a fixing groove formed by being recessed from a bottom surface of the seating groove, and a fixing protrusion is formed on an inner surface of the elastic member to be injected into the fixing groove.
KR1020160029564A 2016-03-11 2016-03-11 Rack Bush of Steering Apparatus for Vehicle KR101793819B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160029564A KR101793819B1 (en) 2016-03-11 2016-03-11 Rack Bush of Steering Apparatus for Vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160029564A KR101793819B1 (en) 2016-03-11 2016-03-11 Rack Bush of Steering Apparatus for Vehicle

Publications (2)

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KR20170106580A KR20170106580A (en) 2017-09-21
KR101793819B1 true KR101793819B1 (en) 2017-11-06

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102187879B1 (en) * 2019-02-01 2020-12-07 한상현 Operation knob for air conditioning control
DE102019131246A1 (en) * 2019-11-19 2021-05-20 Zf Automotive Germany Gmbh Rack and pinion gear, steering gear and steering system

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