KR20130026763A - Rack and pinion type steering apparatus - Google Patents

Rack and pinion type steering apparatus Download PDF

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Publication number
KR20130026763A
KR20130026763A KR1020110090130A KR20110090130A KR20130026763A KR 20130026763 A KR20130026763 A KR 20130026763A KR 1020110090130 A KR1020110090130 A KR 1020110090130A KR 20110090130 A KR20110090130 A KR 20110090130A KR 20130026763 A KR20130026763 A KR 20130026763A
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KR
South Korea
Prior art keywords
rack
support member
ball
bush
circumferential surface
Prior art date
Application number
KR1020110090130A
Other languages
Korean (ko)
Inventor
서동환
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 KR1020110090130A priority Critical patent/KR20130026763A/en
Publication of KR20130026763A publication Critical patent/KR20130026763A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
    • F16H2019/046—Facilitating the engagement or stopping of racks

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

PURPOSE: A rack-and-pinion type steering apparatus is provided to minimize a frictional force by the linear motion of a rack bar when a driver drives a steering wheel by mounting a ball on a support member for supporting the sliding of the rack bar in a rack housing. CONSTITUTION: A rack-and-pinion type steering apparatus comprises a rack bush(230) and a support member(250). The rack bush is inserted and fixed in one side or both sides of a rack housing(210). A rack bar longitudinally passes through the rack bush. The support member is interposed between the inner periphery of the rack bush and the outer periphery of the rack bar to be slidingly in contact with the rack bar.

Description

Rack Pinion Type Steering Apparatus {Rack and Pinion Type Steering Apparatus}

The present invention relates to a rack pinion type steering apparatus. More specifically, by implementing the ball friction to the support member for supporting the sliding of the rack bar from the inside of the rack housing, by implementing the friction friction, the steering wheel smoothes the steering feeling by minimizing the friction force due to the linear movement of the rack bar, rack bar The present invention relates to a rack-pinion type steering apparatus which increases steering wheel restoring force and improves steering sensitivity by reducing sliding resistance of the vehicle.

In general, the steering device is provided between the driver's seat and the wheel to move the wheel by the driver, the steering shaft is provided on the lower side of the steering wheel of the driver's seat, the gear box connected to the steering shaft, and the operation of the gear box. It is configured to include a rack bar extending to the left and right sides so as to operate the wheel directly connected to the wheel.

1 is a partial cross-sectional view showing a rack pinion type steering apparatus of a vehicle according to the prior art.

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

An input shaft 120 is provided at an inner upper side of the gear box 125 so as to be connected to the steering shaft 115 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, the pinion (not shown) is formed on the outer peripheral end of the gear box 125, the gear box 125 on the lower outer side of the gear box 125 It is formed integrally with the rack housing 137 extending to both sides is provided.

The rack housing 137 is formed as a hollow tube, both sides of which are opened, and a rack bush 160, a rack stopper 165, and the like are installed at one side of the opened inlet, and a bellows 150 is provided at the outer circumferential side thereof.

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

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

On the other hand, one side or both sides of the rack housing 137 formed to be opened is provided with a rack bush 160 to guide the movement of the rack bar 140 while supporting the rack bar 140.

The rack bush 160 is provided in a hollow, and the outer circumferential surface is fixed to the inner circumferential surface of the rack housing 137 and is fixed to the step portion 135, and the inner circumferential surface of the rack bush 160 is closely contacted with the outer circumferential surface of the rack bar 140 that is inserted into the rack bar. The sliding of the 140 is guided, and the other end of the rack stopper 165 is pressed into the rack housing 137.

That is, at the end of the rack bush 160 is provided in a hollow to seal the rack housing 137 while being in close contact with the rack bush 160, the rack stopper 165 is tightly fixed to the inner circumferential surface of the rack housing 137 is installed This prevents the departure of the rack bush 160.

The rack pinion type steering apparatus according to the prior art has a wide contact area between the rack bar and the rack bush sliding in the axial direction when the steering wheel is operated by the driver, and the restoring force of the steering wheel is reduced due to the frictional resistance, thereby preventing the steering wheel from being properly restored. The driver's steering sensitivity was reduced.

In addition, since the rack bush according to the prior art transmits the load in the axial and vertical directions of the rack bar when steering the steering wheel of the driver through the rack bar, the rack bush, and the rack housing, durability by wear decreases after a certain time, and vibration There was a problem that the rattle noise caused by the.

Accordingly, the present invention has been made in the background described above, in the rack pinion type steering apparatus, by mounting the ball to the support member for supporting the sliding of the rack bar from the inside of the rack housing to implement rolling friction, the rack bar when the driver's steering wheel operation The purpose of the present invention is to provide a rack-pinion type steering apparatus which improves steering wheel restoring force and improves steering sensitivity by minimizing frictional force due to the linear motion of the steering wheel to smooth the steering feeling and reducing the sliding resistance of the rack bar.

In order to achieve the above object, the present invention converts the rotational movement of the steering shaft into a linear motion, and is fixed to one side or both sides of the rack housing, the rack bush penetrates in the longitudinal direction and the inner peripheral surface of the rack bush and the rack bar It is provided on the outer circumferential surface of the rack pinion type steering apparatus including a support member in sliding contact with the rack bar.

As described above, according to the present invention, by mounting the ball to the support member for supporting the sliding of the rack bar from the inside of the rack housing to implement rolling friction, by minimizing the frictional force by the linear movement of the rack bar when the driver's steering wheel operation Smooth steering and reducing the sliding resistance of the rack bar increase the steering wheel restoring force and improve steering sensitivity.

1 is a partial cross-sectional view showing a rack pinion type steering apparatus of a vehicle according to the prior art.
2 is an exploded perspective view of the rack bush according to the present invention.
3 is a partial cross-sectional view of a rack bush mounted on the rack housing according to the present invention.
4 is an exploded perspective view of a rack bush according to another embodiment of the present invention.
5 is a cross-sectional view of a rack bush according to another embodiment of the present invention.
6 is an exploded perspective view of a rack bush according to another embodiment of the present invention.
7 is a cross-sectional view of a rack bush according to another embodiment of the present invention.
8 is a modification of the support member according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through 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 components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only to distinguish the components from other components, and the nature, order, order, etc. of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

2 is an exploded perspective view of the rack bush according to the present invention, Figure 3 is a partial cross-sectional view of the rack bush according to the present invention mounted on the rack housing.

2 to 3, the rack pinion type steering apparatus of the present invention is fixed to one side or both sides of the rack housing 210 in a hollow tube shape, the rack bush 230 penetrates the rack bar 220 in the longitudinal direction 230 And a support member 250 interposed between the inner circumferential surface of the rack bush 230 and the outer circumferential surface of the rack bar 220 to make sliding contact with the rack bar 220.

The rack housing 210 is a linear bar reciprocating left and right in the rack housing 210, the rack bar 220 teeth coupled to the pinion of the steering shaft when steering the steering wheel of the driver.

The rack bar 220 converts the rotational motion of the steering shaft into a linear motion, and reciprocates in the axial direction (length direction) inside the rack housing 210, and the left and right ends of the rack bar 220 are ball housings (FIG. 1). The ball is inserted into and coupled to the tie rod (see 155 in FIG. 1) through the inner ball joint to which the ball is steered.

The rack bush 230 is provided in a hollow, and the outer circumferential surface is fixed by being pressed or screwed into the inner circumferential surface of the rack housing 210, and the rack bar 220 is supported by the rack bush 230 fixed to the rack housing 210 and is straight The reciprocating motion is performed, in more detail, the rack bar 220 is supported by the support member 250 seated on the inner circumferential surface of the rack bush 230 according to the present invention.

A locking jaw 232 is formed at one side of the inner side of the rack bush 230, one end of the supporting member 250 is in close contact with the locking jaw 232, and the other end of the supporting member 250 is in close contact with the supporting member 250. The stop ring 270 is fastened to the inner circumferential surface of the rack bush 230 to prevent the separation of the rack bush 230.

That is, the support member 250 is inserted into the inner circumferential surface of the rack bush 230, the rack bar 220 is interlocked with this when the driver's steering wheel is operated in the direction of the center axis of the rack housing 210 in the rack housing 210. When sliding to, the end of the rack housing 210 on one side of the inner peripheral surface of the rack bush 230 so that the support member 250 to reduce the friction force while supporting the sliding of the rack bar 220 is not pushed into the rack housing 210 The support member 250 is seated between the stopper 270 fastened to the other side of the inner side of the rack ledge 230 and the latching jaw 232 formed to be stepped to increase the inner diameter in the negative direction.

Subsequently, at least one buried groove 252 is formed on the inner circumferential surface of the support member 250 at a predetermined interval in the circumferential direction, and the ball 260 is embedded in the buried groove 252 so that a portion thereof is exposed to the inside of the support member 250. Install the landfill.

That is, one or more buried grooves 252 are formed in the inner circumferential surface of the support member 250 with a predetermined interval in the circumferential direction, and the buried grooves 252 support friction when sliding the rack bar 220 in the axial direction. Ball 260 to minimize the rolling motion is coupled to protrude inward than the inner peripheral surface of the support member 250.

The ball 260 is in close contact with the outer circumferential surface of the rack bar 220 to guide the sliding of the rack bar 220 while reducing the friction force to freely rotate in the buried groove 252 to reduce the operating force of the steering wheel, the ball 260 The exposed surface of) contacts to support the axial sliding of the rack bar 220.

The support member 250 is coupled to the ball 260 is press-fitted into the buried groove 252, when the ball 260 is rotated in the sliding direction during the sliding of the rack bar 220, the ball 260 does not leave the rack bar ( 220) can be supported.

4 is an exploded perspective view of a rack bush according to another embodiment of the present invention, Figure 5 is a cross-sectional view of a rack bush according to another embodiment of the present invention.

In another embodiment of the present invention, except for the rack bush 330 and the support member 350 is the same as the embodiment of the present invention described above, only the configuration and operation of the rack bush 330 and the support member 350 will be described. Let's do it.

A locking jaw 332 is formed at one side of the inner side of the rack bush 330, and one end of the support member 350 is in close contact with the locking jaw 332, and is closely attached to the other end of the support member 350 to support the support member 350. The stop ring 370 is fastened to the inner circumferential surface of the rack bush 330 to prevent separation

That is, the support member 350 is inserted into the inner circumferential surface of the rack bush 330, and the rack bar 220 is interlocked with the rack bar 220 when the steering wheel is operated by the driver so that the rack housing 210 is located in the center of the rack housing 210. When sliding to the end, the end of the rack housing 210 on one side of the inner peripheral surface of the rack bush 330 so that the support member 350 to reduce the friction force while supporting the sliding of the rack bar 220 is not pushed into the rack housing 210 The supporting member 350 is seated between the stopper 370 fastened to the other side of the inner side of the rack 330 and the locking jaw 332 formed to be stepped to increase the inner diameter in the negative direction.

Subsequently, at least one insertion hole 352 is formed on the inner circumferential surface of the support member 350 at a predetermined interval in the circumferential direction, and the ball 360 is inserted into the insertion hole 352 so that a portion thereof is exposed to the inside of the support member 350. Install the landfill.

That is, the inner circumferential surface of the support member 350 has a predetermined interval in the circumferential direction and at least one insertion hole 352 penetrates in the center direction of the shaft to form a plurality of rows, and the insertion hole 352 has an axial direction of the rack bar 220. Rolling ball 360 to minimize the frictional force while supporting this when sliding is coupled to protrude inward than the inner peripheral surface of the support member 350.

In other words, the support member 350 forms a small insertion hole 352 on the inner side so that a portion of the ball 360 is exposed to the inside, thereby installing the ball 360, thereby sliding the rack bar 220. While rotating in the sliding direction, the ball 360 can support the rack bar 220 without being separated.

Ball 360 is in close contact with the outer circumferential surface of the rack bar 220 to guide the sliding of the rack bar 220 while reducing the friction force to rotate freely in the insertion hole 352 to reduce the operating force of the steering wheel, the ball 360 The exposed surface of) contacts to support the axial sliding of the rack bar 220.

In addition, a cylindrical fixing member 354 may be fastened to surround the outer circumferential surface of the support member 350 to prevent the ball 360 from being inserted into the insertion hole 352 from the outer circumferential surface of the support member 350.

That is, at least one insertion hole 352 is formed on the inner circumferential surface of the support member 350 at regular intervals in the circumferential direction to couple the balls 360 to prevent separation of the ball 360 inserted into the insertion hole 352. The cylindrical fixing member 354 is fastened to surround the outer circumferential surface of the support member 350 and installed on the inner circumferential surface of the rack bush 330, thereby preventing the ball 360 from being separated when the rack bar 220 is slid. Even when the ball 360 is coupled to the rack bush 330 at a time, the assembly is improved.

6 is an exploded perspective view of a rack bush according to another embodiment of the present invention, Figure 7 is a cross-sectional view of a rack bush according to another embodiment of the present invention, Figure 8 is a support according to another embodiment of the present invention It is a variation of the member.

In another embodiment of the present invention, except for the rack bush 430 and the support member 450 is the same as the embodiment of the present invention described above, only the configuration and operation of the rack bush 430 and the support member 450 Let's explain.

A locking jaw 432 is formed at one side of the inner side of the rack bush 430, and one end of the supporting member 450 is in close contact with the locking jaw 432, and is closely attached to the other end of the supporting member 450 to support the support member 450. The stop ring 470 is fastened to the inner circumferential surface of the rack bush 430 to prevent separation

That is, the support member 450 is inserted into the inner circumferential surface of the rack bush 430, and the rack bar 220 is interlocked with the rack bar 220 when the steering wheel is operated by the driver so that the rack housing 210 is located in the center of the rack housing 210. When sliding to, the end of the rack housing 210 on one side of the inner peripheral surface of the rack bush 430 so that the support member 450 to reduce the friction force while supporting the sliding of the rack bar 220 is not pushed into the rack housing 210 The supporting member 450 is seated between the stopper 470 fastened to the other side of the inner peripheral surface of the racking 430 and the latching jaw 432 formed to be stepped to increase the inner diameter in the negative direction.

Subsequently, the ball receiving portion 452 is formed radially on the inner circumferential surface of the supporting member 450 in a axial direction, and the ball receiving portion 452 is exposed to the ball receiving portion 452 so that a part of the ball 460 is exposed to the inside of the supporting member 450. 460 is buried.

That is, the plurality of balls 460 are installed in the support member 450 in a plurality of rows in the axial direction, and the opening portion having a width smaller than the diameter of the ball 460 so that the balls 460 are not separated from the ball receiving portion 452. 454 is formed, a portion of the ball 460 is exposed through the opening 454 and at the same time the ball 460 is free to rotate in the ball receiving portion 452, the exposure of the ball 460 exposed inward The surface is in contact so as to support the axial sliding of the rack bar 220.

In addition, the ball receiving portion 452 of the support member 450 may be formed with openings 454 on both sides, as shown in Figure 8 (a), as shown in Figure 8 (b) both sides of the ball receiving portion 452. Openings 454 may be formed to separate them.

The ball 460 is in close contact with the outer circumferential surface of the rack bar 220 to guide the sliding of the rack bar 220 while reducing the friction force to freely rotate within the ball receiving portion 452 to reduce the operating force of the steering wheel, the ball 460 The exposed surface of) contacts to support the axial sliding of the rack bar 220.

As described above, according to the present invention, by mounting the ball to the support member for supporting the sliding of the rack bar from the inside of the rack housing to implement rolling friction, by minimizing the frictional force by the linear movement of the rack bar when the driver's steering wheel operation Smooth steering and reducing the sliding resistance of the rack bar increase the steering wheel restoring force and improve steering sensitivity.

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 meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms used generally, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

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.

210: rack housing 220: rack bar
230: rack bush 232: locking jaw
250: support member 252: buried groove
260: ball 270: stop ring

Claims (8)

By converting the rotation of the steering shaft into a linear movement,
A rack bush inserted into one side or both sides of the rack housing and having a rack bar penetrating therein;
A support member interposed between an inner circumferential surface of the rack bush and an outer circumferential surface of the rack bar and sliding contact with the rack bar;
Rack pinion steering system comprising a. The method of claim 1,
A locking jaw is formed at one side of the inner circumferential surface of the rack bush, one end of the supporting member is in close contact with the locking jaw, and a stop ring is fastened to the inner circumferential surface of the rack bush at the other end of the supporting member to support the supporting member. Rack pinion steering system, characterized in that. The method of claim 1,
At least one buried groove is formed on an inner circumferential surface of the support member;
Rack pinion type steering apparatus, characterized in that the ball is embedded in the buried groove so as to be exposed to the inside of the support member. The method of claim 3, wherein
Rack pinion type steering apparatus, characterized in that the exposed surface of the ball in contact with the rack bar. The method of claim 1,
At least one insertion hole formed in the support member,
Rack pinion type steering device, characterized in that the ball is embedded in the insertion hole so as to be exposed to the inside of the support member. The method of claim 5, wherein
Rack pinion type steering apparatus, characterized in that the exposed surface of the ball exposed inwards and the rack bar and the rolling contact. The method according to claim 6,
Rack pinion type steering apparatus, characterized in that the fixing member is coupled to the outer peripheral surface of the support member to prevent the ball from being inserted into the insertion hole. The method of claim 1,
The ball receiving portion is formed in the axial direction on the inner circumferential surface of the support member,
Rack pinion type steering apparatus, characterized in that the ball is buried in the ball receiving portion to be exposed to the inside of the support member.
KR1020110090130A 2011-09-06 2011-09-06 Rack and pinion type steering apparatus KR20130026763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110090130A KR20130026763A (en) 2011-09-06 2011-09-06 Rack and pinion type steering apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110090130A KR20130026763A (en) 2011-09-06 2011-09-06 Rack and pinion type steering apparatus

Publications (1)

Publication Number Publication Date
KR20130026763A true KR20130026763A (en) 2013-03-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110090130A KR20130026763A (en) 2011-09-06 2011-09-06 Rack and pinion type steering apparatus

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104691606A (en) * 2013-12-03 2015-06-10 株式会社捷太格特 Steering apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104691606A (en) * 2013-12-03 2015-06-10 株式会社捷太格特 Steering apparatus

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