KR20130096864A - Rack bush assembly and rack and pinion type steering apparatus for vehicle having the same - Google Patents

Abstract

PURPOSE: A rack bush assembly and a rack pinion type steering device of a vehicle including the same are provided to reduce time required for an assembly process, the possibility of a loss of components in the assembly process, and production costs. CONSTITUTION: A rack bush assembly (300) comprises a first bush (310), a first sealing member (330), a second bush (350), and a second sealing member (370). The first bush includes a hollow which a rack bar penetrates. The first bush supports the rack bar and absorbs vibration of the rack bar by being fixed to the end of a cylinder tube. The first sealing member seals a gap between the first bush and the outer circumference of the rack bar by being fixed to a first insertion groove of the first bush. The second bush is fixed to a second insertion groove of the first bush and complements the function of the first bushes. The second sealing member is mounted on the first insertion groove of the first bush and seals the space between the first bush and the inner circumference of the cylinder tube.

Description

Rack Bush Assembly and Rack and Pinion Type Steering Apparatus for Vehicle having the same}

The present invention relates to a rack bush assembly and a rack pinion type steering apparatus of a vehicle including the same, and more particularly, to reduce the time required in the assembly process, to reduce the possibility of missing parts in the assembly process, production cost It relates to a rack bush assembly and a rack pinion type steering apparatus of a vehicle including the same.

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 both sides of the rack bar so as to be directly operated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing a conventional rack-and-pinion steering apparatus for an automobile.

Referring to FIG. 1, a gear box 125 connected to the rack housing 133 is provided below the steering wheel 110 and the steering shaft 115.

The gear box 125 is provided with an input shaft 120 connected to the steering shaft 115 at an upper side thereof so as to receive a rotational force generated from the steering wheel 110.

The inner lower side of the gear box 125 is rotated by the rotational force transmitted through the input shaft 120 is provided with a pinion (not shown) formed on the outer peripheral end of the gear box 125 and the gear box 125 and the lower outer side of the gear box 125 and The rack housing 133 is integrally formed.

A cylinder tube 137 is coupled to one side of the rack housing 133. The cylinder tube 137 is formed as a hollow tube with both open sides and a rack bush 160 and a rack stopper 165 are installed on one side of the opening and a bellows 150 is provided on the outer circumference side.

Inside the cylinder tube 137, there is provided a rack bar 140 having a rack in the middle thereof so as to be engaged with a pinion provided in the gear box 125.

The rack bar 140 is provided to linearly move in the axial direction in the cylinder tube 137 and is formed in the middle of the rack bar 140 so that the rack bar 140 can be engaged with the pinion of the gear box 125, And a tie rod 155 is connected to the ball housing 175 via an inner ball joint to which a ball is inserted.

A rack bush 160 is provided at one side of the cylinder tube 137 formed to be opened to guide the movement of the rack bar 140 while supporting the rack bar 140 and to support the oil seal 170.

The rack bush 160 is provided in a hollow, and the outer circumferential surface is fixed to the inner circumferential surface of the cylinder tube 137 and stepped part 135, and the inner circumferential surface of the rack bush 160 is closely contacted with the outer circumferential surface of the rack bar 140 to be inserted into the rack bar. The sliding of the 140 is guided, and the rack stopper 165 is press-fitted to the cylinder tube 137 at the other end on the opposite side.

A hollow rack stopper 165 closely attached to the inner circumferential surface of the cylinder tube 137 while being in close contact with the rack bush 160 is provided at the end of the rack bush 160 so as to seal the cylinder tube 137 Thereby preventing the rack bush 160 from being disengaged.

However, the rack pinion type steering apparatus of the vehicle according to the related art is the oil seal 170, the rack bush 160, the rack stopper 165 is manufactured as a separate product, the cylinder tube 137 sequentially in the assembly process ), There is a problem that the time required for the assembly process increases. In addition, when some parts are missing during the assembly process, there was a problem of oil leakage, and because the rack stopper 165 to be manufactured and mounted separately, there was a problem that the production cost increases.

Accordingly, the present invention has been made in view of the above-described background, it is possible to shorten the time required in the assembly process, reduce the possibility of missing parts in the assembly process, lower the production cost of the rack bush assembly and the automobile including the same It is an object of the present invention to provide a rack pinion type steering apparatus.

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

According to an aspect of the present invention, the rack bar has a hollow penetrating, the first bush is fixed to the end of the cylinder tube, the first insertion groove is formed parallel to the axial direction on one side; And a first sealing member inserted into and fixed to the first insertion groove.

In addition, the other side of the first bush, a second insertion groove parallel to the axial direction is further formed, the rack bush assembly may be provided, characterized in that the second bush is inserted into the second insertion groove.

In addition, the second bush may be provided with a rack bush assembly characterized in that it comprises an incision cut diagonally from one side to the other side.

In addition, a rack bush assembly may be provided on an outer circumferential surface of the first bush along a circumference thereof, and a second sealing member may be inserted into the first groove.

In addition, a rack bush assembly may be provided on the outer circumferential surface of the first bush, a second groove is formed adjacent to the first groove, and a wire is inserted into the second groove.

According to another aspect of the present invention, the rack bar for steering the wheel by reciprocating linear movement in the axial direction by receiving the rotational force of the steering wheel; A cylinder tube in which the rack bar is circumscribed; And the rack pinion type steering apparatus of the vehicle, characterized in that it comprises the rack bush assembly that is fixed to the end of the cylinder tube to support the rack bar.

According to the embodiment of the present invention, it is possible to shorten the time required for the assembly process to increase the product production efficiency, to reduce the possibility of parts missing during the assembly process to improve product quality, and to reduce the production cost have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing a conventional rack-and-pinion steering apparatus for a vehicle;
2 is a view showing the structure of a rack pinion type steering apparatus according to an embodiment of the present invention;
3 is an exploded perspective view of the rack bush assembly of FIG. 2;
4 is a cross-sectional view of the rack bush assembly of FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though 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 addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can 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."

2 is a view showing the structure of a rack pinion type steering apparatus according to an embodiment of the present invention. 3 is an exploded perspective view of the rack bush assembly of FIG. 2. 4 is a cross-sectional view of the rack bush assembly of FIG.

2 to 4, the rack pinion type steering apparatus 200 includes a pinion valve assembly 225, a cylinder tube 237, a rack bar 240, and a rack bush assembly 300.

The pinion valve assembly 225 is located below the steering wheel 210 and the steering shaft 215. The hydraulic pump 230 is connected to the side of the pinion valve assembly 225. Pinion valve assembly 225 regulates the oil supplied through hydraulic pump 230. An input shaft 220 is provided above the pinion valve assembly 225. The input shaft 220 is connected to the steering shaft 215 to receive the rotational force generated by the steering wheel 210. A pinion (not shown) is provided inside the pinion valve assembly 225. The pinion (not shown) is rotated by the rotational force transmitted through the input shaft 220, it is a structure formed in the outer peripheral portion of the end. The rack housing 235 is provided on the lower outer side of the pinion valve assembly 225. The rack housing 235 is formed integrally with the pinion valve assembly 225 and extends on both sides. The rack bar 240 is positioned inside the rack housing 235.

Cylinder tube 237 is coupled with rack housing 235. One end of the rack housing 235 is press-fitted to one end of the cylinder tube 237. The rack bar 240 is positioned inside the cylinder tube 237. Cylinder tube 237 is provided as a hollow tube. The cylinder tube 237 is a hollow tube that forms a space in which oil supplied through the pinion valve assembly 225 flows, and is open at both sides thereof.

 The rack bar 240 includes a rack (not shown) formed therebetween so as to be engaged with a pinion (not shown) provided in the pinion valve assembly 225. The rack bar 240 linearly moves axially in the rack housing 235 and the cylinder tube 237. The left and right sides of the rack bar 240 are connected to the tie rods 255 through an inner ball joint through which balls are inserted into and coupled to the ball housing 275, and the wheels are steered by the axial linear movement of the rack bar 240. do.

The rack bar 240 is provided with a piston 245. The piston 245 is in close contact with the inner circumferential surface of the cylinder tube 237 and slides inside the cylinder tube 237. The O-ring 243 is coupled to the outer circumferential surface of the piston 245. The piston 245 is positioned between two hydraulic pipes 231 and 232 connected to the pinion valve assembly 225 to assist the axial linear movement of the rack bar 240 by the hydraulic pressure supplied through the pinion valve assembly 225.

The rack bush assembly 300 is inserted into and fixed to the end of the cylinder tube 237 to support the rack bar 240.

The rack bush assembly 300 includes a first bush 310, a first sealing member 330, a second bush 350, and a second sealing member 370.

The first bush 310 is a cylindrical shape having a hollow through which the rack bar 240 penetrates, and is inserted into and fixed to an end of the cylinder tube 237 to support the rack bar 240, and absorbs the vibration of the rack bar 240. The first bush 310 may be formed of various materials capable of supporting and vibration absorbing the rack bar 240 such as plastic and rubber.

The first insertion groove 311 is formed side by side in the axial direction on one side of the first bush (310). Here, the axial direction refers to the longitudinal direction of the first bush 310, hereinafter refer to the same direction. The first sealing member 330 to be described later is inserted into the first insertion groove 311 is fixed. As such, the first insertion groove 311 is formed at one side of the first bush 310, and the first sealing member 330 is inserted into the first insertion groove 311 and fixed to the first bush 310 and the first bushing 311. The sealing member 330 can be set. The width W1 of the first insertion groove 311 corresponds to the width of the first sealing member 330 to be described later. In addition, the diameter D1 of the first insertion groove 311 corresponds to the outer diameter of the first sealing member 330. The diameter D1 of the first insertion groove 311 may be variously changed according to the outer diameter of the first sealing member 330.

The second insertion groove 313 is further formed side by side in the axial direction on the other side of the first bush (310). A second bush 350 to be described later is inserted into and fixed to the second insertion groove 313. As such, the second insertion groove 313 is further formed on the other side of the first bush 310, and the second bush 350 is inserted into the second insertion groove 313 to fix the second bushing 313. The second bush 350 can be set. The width W2 of the second insertion groove 313 corresponds to the width of the second bush 350 to be described later. The diameter D2 of the second insertion groove 313 corresponds to the outer diameter of the second bush 350. The diameter D2 of the second insertion groove 313 may be variously changed according to the outer diameter of the second bush 350.

The first groove 315 is formed along the periphery of the outer circumferential surface of the first bush 310. The first sealing member 370 to be described later is inserted into the first groove 315.

The second groove 317 is formed on the outer circumferential surface of the first bush 310 adjacent to the first groove 315 along its circumference. The wire is inserted into the second groove 317. By inserting the wire into the second groove 317 as described above, the friction force is improved between the first bush 310 and the inner circumferential surface of the cylinder tube 237, thereby firmly fixing the first bush 310 to the inner circumferential surface of the cylinder tube 237. You can.

The first sealing member 330 is inserted into and fixed to the first insertion groove 311 of the first bush 310. The first sealing member 370 inserted into the first groove 315 seals between the first bush 310 and the outer circumferential surface of the rack bar 240.

The second bush 350 is inserted into and fixed to the second insertion groove 313 of the first bush 310. The second bush 350 is provided in a hollow cylindrical shape. The second bush 350 may be formed of a material such as plastic, rubber, or the like as the first bush 310. By inserting and fixing the second bush 350 in the second insertion groove 313 as described above, the function of the first bush 310 supporting the rack bar 240 and absorbing the vibration can be complemented.

The second bush 350 may include an incision 351 diagonally cut from one side to the other side. The cutout 351 allows the second bush 350 to be easily inserted into the second insertion groove 313. That is, by forming the cutout 351, when the second bush 350 is mounted in the second insertion groove 313, the second bush 350 may be compressed to reduce the diameter thereof, thereby easily reducing the diameter of the second bush 350. It may be inserted into the second insertion groove 313.

The second sealing member 370 is mounted in the first groove 315 of the first bush 310. For example, the second sealing member 370 may be an O-ring. By mounting the second sealing member 370 in the first groove 315, a space between the first bush 310 and the inner circumferential surface of the cylinder tube 237 may be sealed.

2, 3, and 4, the process of mounting the rack bush assembly according to an embodiment of the present invention will be described.

First, the worker prepares the rack bush assembly 300. At this time, the rack bush assembly 300 is assembled in the following order to be a set. That is, the first sealing member 330 is inserted into the first insertion groove 311 of the first bush 310, the second bush 350 is inserted into the second insertion groove 313, and the second sealing member 370 is inserted into the first groove 315, and a wire (not shown) is inserted into the second groove 317. Thereafter, the operator inserts the rack bush assembly 300 at one end of the rack bar 240 located inside the cylinder tube 237.

According to this embodiment of the present invention, by setting the oil seal (170, see Fig. 1), rack bush 160, stopper 165, which was conventionally manufactured and assembled separately, by setting a single rack bush assembly 300 The time required for the assembly process can be shortened to increase the product production efficiency. In addition, by using one set of rack bush assembly 300 has the effect of improving the quality of the product by reducing the possibility of missing parts in the assembly process. In addition, since the stopper 165 that previously supported the rack bush 160 is not necessary, there is an effect of lowering the production cost.

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. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more.

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 protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

200: rack pinion steering system
225: Pinion Valve Assembly
237: Cylinder tube
240: rack bar
300: Rack Bush Assembly
310: first bush
330: first sealing member
350: second bush
370: second sealing member

Claims (6)

A first bush having a hollow through which the rack bar penetrates and is inserted and fixed at an end of the cylinder tube, and having a first insertion groove formed at one side in parallel with the axial direction; And
A first sealing member inserted into and fixed to the first insertion groove
Rack bush assembly comprising a. The method of claim 1,
On the other side of the first bush, a second insertion groove parallel to the axial direction is further formed,
Rack bush assembly, characterized in that the second bush is inserted into the second insertion groove. 3. The method of claim 2,
The second bush is a rack bush assembly, characterized in that it comprises an incision cut diagonally from one side to the other side. 3. The method of claim 2,
The outer circumferential surface of the first bush is formed with a first groove along the circumference thereof,
And a second sealing member is inserted into the first groove. 5. The method of claim 4,
On the outer circumferential surface of the first bush, a second groove is formed adjacent to the first groove,
Rack bush assembly, characterized in that the wire is inserted into the second groove. A rack bar that receives the rotational force of the steering wheel and linearly reciprocates in the axial direction to thereby steer the wheel;
A cylinder tube in which the rack bar is housed; And
The rack bush assembly according to any one of claims 1 to 5, wherein the rack bush assembly is fixed to the end of the cylinder tube to support the rack bar.
And a rack-pinion type steering apparatus for a vehicle.

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