KR101477854B1 - Hydraulic Power Steering Apparatus - Google Patents

Abstract

The present invention relates to a hydraulic power assist steering apparatus. According to the embodiment of the present invention, it is possible to reduce the time required for the product processing by reducing the length of the rack housing, to reduce the cost, and to prevent the oil seal mounted in the cylinder tube from being separated .

Description

Technical Field [0001] The present invention relates to a hydraulic power steering apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power assist steering apparatus, and more particularly, to a hydraulic power assist steering apparatus for an automobile, which can easily mount a stopper for preventing a sealing member mounted in a cylinder tube from departing and fixing a position of a sealing member .

The steering system of the vehicle is provided between the driver and the wheel so that the driver can steer the wheel.

1 is a partial cross-sectional view of a hydraulic power assisted steering apparatus of an automobile according to the prior art.

1, a conventional hydraulic power assist steering apparatus includes a gear box housing 125, a rack housing 135, a cylinder tube 137, a rack bar 140, and a tie rod 155. [

The gearbox housing 125 surrounds the input shaft 120. The input shaft 120 is connected to the steering shaft 115 and the steering shaft 115 is connected to the steering wheel 110 to transmit the rotational force generated by the steering wheel 110 to the input shaft 120.

The rack housing 135 is formed integrally with the gear box housing 125.

The cylinder tube 137 is connected to one side of the rack housing 135. The oil seals 138a and 138b are mounted inside the cylinder tube 137.

The rack bar 140 is linearly moved in the axial direction within the rack housing 135 and the cylinder tube 137. At both ends of the rack bar 140, a tie rod 155 is connected via a ball housing 175.

However, in the hydraulic power assist steering apparatus for an automobile according to the related art, the oil seal 138a mounted inside the cylinder tube 137 is disengaged and leakage occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic power assisted steering apparatus for a vehicle which can easily disengage a sealing member mounted in a cylinder tube and easily mount a stopper for fixing a position of a sealing member, .

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 embodiment of the present invention, there is provided a rack comprising: a rack housing; A cylinder tube coupled to the rack housing; A rack bar that linearly moves in the axial direction within the rack housing and the cylinder tube; A sealing member coupled between the cylinder tube and the rack bar; And a stopper mounted on an inner circumferential surface of the cylinder tube to fix a position of the sealing member.

The hydraulic power assisted steering apparatus may further include a fixing member for fixing the stopper to the inner circumferential surface.

The stopper may further include: a first plate; A second plate spaced apart from the first plate by a predetermined distance, the first plate being parallel to the first plate; And a connecting portion connecting the first plate and the second plate, wherein the fixing member is inserted between the first plate and the second plate, and the inner peripheral surface has a groove A hydraulic power assisted steering apparatus can be provided.

The hydraulic power assisted steering apparatus according to any one of claims 1 to 3, wherein either or both of the first plate and the second plate are formed with an exposing groove such that both end portions of the fixing member are exposed.

Wherein one of the first plate and the second plate is formed with an exposing groove such that both end portions of the fixing member are exposed and the other is formed with a guide groove corresponding to the exposing groove, A device may be provided.

According to the embodiment of the present invention, there is an effect that the sealing member mounted in the cylinder tube is prevented from coming off, and the stopper for fixing the position of the sealing member can be easily mounted.

1 is a partial cross-sectional view of a hydraulic power assisted steering apparatus of an automobile according to the prior art;
2 is a view showing a structure of a hydraulic power assist steering apparatus of an automobile according to an embodiment of the present invention;
3 is a partially enlarged view of the portion 'A' in FIG. 2;
4 is a plan view of the stopper of Fig. 3;
Fig. 5 is a side view of the stopper of Fig. 3; Fig.
Fig. 6 is a plan view of the fixing member of Fig. 3;

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."

2 is a view showing a structure of a hydraulic power assisted steering apparatus of an automobile according to an embodiment of the present invention. 3 is a partial enlarged view of the portion 'A' of FIG.

2 and 3, the hydraulic power assist steering apparatus 200 includes a gearbox housing 225, a rack housing 235, a cylinder tube 237, sealing members 270a and 270b, a stopper 280, And includes a fixing member 290.

The gearbox housing 225 is located below the steering wheel 210 and the steering shaft 215. A hydraulic pump 230 is connected to the side surface of the gearbox housing 225. A pinion valve assembly (not shown) including an input shaft 220 is provided in the gear box housing 225. The pinion valve assembly (not shown) adjusts the oil supplied through the hydraulic pump 230. The input shaft 220 is connected to the steering shaft 215 and receives the rotational force generated from the steering wheel 210. A pinion (not shown) is provided on the inner lower side of the pinion valve assembly (not shown). A pinion (not shown) rotates by the rotational force transmitted through the input shaft 220, and a tooth is formed on the outer peripheral end of the pinion. A rack housing 235 is integrally formed on the lower outer side of the gear box housing 225. 1, the axial length of the rack housing 235 according to the embodiment of the present invention is shorter than that of the conventional rack housing 135 in comparison with the rack housing 135 in the hydraulic power assist steering apparatus of the conventional automobile. Therefore, since the amount of the material (for example, aluminum) required for the production is small, the manufacturing cost of the rack housing 235 can be reduced.

Referring again to Figures 2 and 3, the cylinder tube 237 is coupled to the rack housing 235. One end of the rack housing 235 is press-fitted to one end of the cylinder tube 237. The cylinder tube 237 is provided with a hollow tube. The cylinder tube 237 is a hollow tube that forms a space through which oil supplied through a pinion valve assembly (not shown) flows, and has a structure in which both sides are open. A sealing member 270b, a rack bush 260, a rack stopper 265 and the like are sequentially installed on the opening of the cylinder tube 237 and a bellows 250 is provided on the outer periphery thereof. A sealing member 270a and a stopper 280 are installed at a position distant from the inlet of the cylinder tube 237 which is open at one side. The sealing members 270a and 270b block leakage of the oil supplied into the cylinder tube 237 and define a space through which the oil that applies the hydraulic pressure to the rack bar 240 flows. The sealing members 270a, 270b are similar to the oil seals 138a, 138b of FIG.

The rack bar 240 includes a rack formed in the middle thereof so as to be engaged with a pinion (not shown) provided in the pinion valve assembly (not shown). The rack bar 240 is linearly moved in the axial direction within the rack housing 235 and the cylinder tube 237. The left and right sides of the rack bar 240 are connected to the tie rod 255 via an inner ball joint to which a ball is inserted and coupled to the ball housing 275 to steer the wheels.

The rack bar 240 is provided with a piston 245. The piston 245 is in close contact with the inner surface of the cylinder tube 237 and slides inside the cylinder tube 237. An O-ring 243 is coupled to the outer peripheral surface of the piston 245. The piston 245 is installed between the two hydraulic pipes 231 and 232 connected to the gearbox housing 225 and is operated by the oil pressure supplied by the oil supplied through the pinion valve assembly (not shown).

The rack bush 260 is provided on one side of the cylinder tube 237. The rack bushes 260 guide the movement of the rack bar 240. The rack bushing 260 is hollow. The outer circumferential surface of the rack bushing 260 is fixed in close contact with the inner circumferential surface of the cylinder tube 237. The inner circumferential surface of the rack bush 260 is in close contact with the outer circumferential surface of the rack bar 240 inserted in the hollow to guide the sliding of the rack bar 240.

The sealing member 270a is coupled between the cylinder tube 237 and the rack bar 240. [ The sealing member 270a seals a space between the cylinder tube 237 and the rack bar 240 to prevent the oil from leaking.

The stopper 280 is mounted on the inner circumferential surface of the cylinder tube 237 to fix the position of the sealing member 270a. The stopper 280 is mounted on the inner circumferential surface of the cylinder tube 237 so as to support the sealing member 270a on the side surface of the sealing member 270a so that the sealing member 270a moves in the axial direction, It is possible to prevent separation. The fixing member 290 fixes the stopper 280 to the inner circumferential surface of the cylinder tube 237.

4 is a plan view of the stopper of Fig. 5 is a side view of the stopper of Fig. Fig. 6 is a plan view of the fixing member of Fig. 3;

3 to 6, the stopper 280 includes a first plate 281, a second plate 283, and a connecting portion 285. [

The first plate 281 has a ring shape with a hollow through which the rack bar 240 passes. The hollow diameter D3 of the first plate 281 is somewhat larger than the diameter of the rack bar 240. [

The second plate 283 is ring-shaped with a hollow through which the rack bar 240 passes. The second plate 283 may have a shape similar to the first plate 281. The hollow diameter of the second plate 283 is the same as the hollow diameter D3 of the first plate 281.

The connection portion 285 is provided between the first plate 281 and the second plate 283 to connect the first plate 281 and the second plate 283. The connecting portion 285 is in the shape of a ring having a hollow through which the rack bar 240 passes. The hollow diameter of the connecting portion 285 is the same as the hollow diameter D3 of the first plate 281 and the second plate 283. By setting the hollow diameter D3 of each of the first plate 281, the second plate 283 and the connecting portion 285 to be somewhat larger than the diameter of the rack bar 240 as described above, 280 and smoothly move linearly.

 The outer diameter D4 of the connecting portion 285 is smaller than the outer diameters D1 and D2 of the first plate 281 and the second plate 283, respectively. Therefore, a space S is formed between the first plate 281 and the second plate 283 at the periphery of the connection portion 285. A space S is formed between the first plate 281 and the second plate 283 and a fixing member 290 to be described later inserted into the space S is inserted into the groove 238 of the cylinder tube 237 So that the stopper 280 can be firmly fixed in the cylinder tube 237.

The first plate 281 has a pair of exposed grooves 310a and 310b. Alternatively, the exposed grooves 310a and 310b may be formed in the second plate 283. Also, the exposed grooves 310a and 310b may be formed in both the first plate 281 and the second plate 283. In addition, one exposed groove may be formed on either or both of the first plate 281 and the second plate 283.

The exposed grooves 310a and 310b are formed to face each other with respect to the center of the first plate 281.

The fixing member 290 is fitted in the space S between the first plate 281 and the second plate 283 of the stopper 280. [ In one example, the fastening member 290 may be provided with a C-TYPE snap ring. When the C-TYPE snap ring is fitted into the space S of the stopper 280, the operator uses the tool to open the exposed C-type C-TYPE snap ring through one of the exposure grooves 310a and 310b, TYPE) Both ends 291a and 291b of the snap ring can be held. By forming the exposure grooves 310a and 310b in the first plate 281 as described above, it is possible to prevent the operator from moving the C-TYPE snap ring exposed through any one of the exposure grooves 310a and 310b during the assembling process. Both end portions 291a and 291b can be easily caught by the tool and the stopper 280 can be easily mounted on the cylinder tube 237. [

Meanwhile, when the pair of exposure grooves 310a and 310b is formed on the first plate 281, a pair of guide grooves 330a and 330b may be formed on the second plate 283. [ Alternatively, when one exposed groove is formed in the first plate 281, one guide groove is also formed in the second plate 283. The pair of guide grooves 330a and 330b are formed to face each other with respect to the center of the second plate 283. One of the guide grooves 330a and 330b is formed in the through holes 293a and 293b formed in both end portions 291a and 291b of the C-TYPE snap ring when the C-TYPE snap ring is mounted. When the tool is inserted, the end of the tool penetrating through the through holes 293a and 293b provides a space for smooth movement.

A process of mounting the stopper will be described with reference to FIGS. 2 to 6. FIG.

First, the operator inserts the sealing member 270a into the proper position in the cylinder tube 237. [ The operator inserts the fixing member 290 between the first plate 281 and the second plate 283 of the stopper 280 and presses the fixing member 290 exposed through any one of the exposure grooves 310a and 310b The stopper 280 is inserted into the cylinder tube 237 in a state in which both end portions 291a and 291b are compressed by inserting a tool into the through holes 293a and 293b of both end portions 291a and 291b. When the fixing member 290 fitted to the stopper 280 reaches the position of the groove 238 formed in the inner circumferential surface of the cylinder tube 237, the pressing member 290 is released from the compressed state so that the fixing member 290 is inserted into the groove 238 The stopper 280 is firmly fixed in the cylinder tube 237 and the positionally fixed stopper 280 supports the sealing member 270 to prevent it from being detached from the initial mounting position.

According to the embodiment of the present invention having such a structure and a shape, it is possible to prevent the release of the sealing member mounted in the cylinder tube, and to easily mount the stopper for fixing the position of the sealing member.

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: Hydraulic power assist steering device 210: Steering wheel
215: steering shaft 220: input shaft
225: gearbox housing 230: hydraulic pump
235: rack housing 237: cylinder tube
240: Rack bar 260: Rack bush
265: rack stopper 270a, 270b: sealing member
280: Stopper 290: Fixing member
310a, 310b: Exposed grooves 330a, 330b: Guide grooves

Claims (5)

Rack housing;
A cylinder tube coupled to the rack housing;
A rack bar that linearly moves in the axial direction within the rack housing and the cylinder tube;
A sealing member coupled between the cylinder tube and the rack bar; And
A stopper mounted on an inner circumferential surface of the cylinder tube to fix a position of the sealing member and having a first plate and a second plate spaced apart from each other by a predetermined distance and a connecting portion connecting the first plate and the second plate;
And a fixing member inserted between the first plate and the second plate,
And a groove for inserting a part of the fixing member is formed along the periphery of the inner circumferential surface, and either or both of the first plate and the second plate is provided with an exposing groove so that both end portions of the fixing member are exposed. A hydraulic power assist steering device. Rack housing;
A cylinder tube coupled to the rack housing;
A rack bar that linearly moves in the axial direction within the rack housing and the cylinder tube;
A sealing member coupled between the cylinder tube and the rack bar; And
A stopper mounted on an inner circumferential surface of the cylinder tube to fix a position of the sealing member and having a first plate and a second plate spaced apart from each other by a predetermined distance and a connecting portion connecting the first plate and the second plate;
And a fixing member inserted between the first plate and the second plate,
A groove for inserting a part of the fixing member is formed along the periphery of the inner circumferential surface, and an exposing groove is formed in one of the first plate and the second plate such that both end portions of the fixing member are exposed, Wherein the guide grooves are formed to correspond to the exposed grooves.
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