KR101405766B1 - Reducer of Electronic Power Steering Apparatus and Electronic Power Steering Apparatus using The Same - Google Patents

Reducer of Electronic Power Steering Apparatus and Electronic Power Steering Apparatus using The Same Download PDF

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Publication number
KR101405766B1
KR101405766B1 KR1020100016289A KR20100016289A KR101405766B1 KR 101405766 B1 KR101405766 B1 KR 101405766B1 KR 1020100016289 A KR1020100016289 A KR 1020100016289A KR 20100016289 A KR20100016289 A KR 20100016289A KR 101405766 B1 KR101405766 B1 KR 101405766B1
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South Korea
Prior art keywords
worm
support
elastic
hollow portion
worm wheel
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KR1020100016289A
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Korean (ko)
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KR20110096816A (en
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김승중
정영석
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주식회사 만도
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Publication of KR101405766B1 publication Critical patent/KR101405766B1/en

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)

Abstract

The present invention relates to a speed reducer of an electric power assisted steering apparatus and an electric power assisted steering apparatus using the same.
One embodiment of the present invention includes a worm shaft bearing coupled to an end opposite to a motor shaft coupling portion of a worm shaft; And at least one hollow portion formed in a circumferential direction at a position in a direction in which the worm shaft and the worm wheel engage with each other so as to absorb the gap between the worm wheel and the worm wheel engaged with the worm shaft, The present invention provides a reduction gear unit of an electric power assisted steering apparatus and an electric power assisted steering apparatus having the same.
According to the present invention, it is possible to reduce rattle noise caused by an increase in backlash due to wear of a worm and a worm wheel, or a rattling noise caused by an impact transmitted through a wheel and a steering shaft from a road surface, Thereby increasing the steering feeling of the vehicle.

Description

TECHNICAL FIELD [0001] The present invention relates to a reduction gear of an electric power assist steering apparatus and an electric power assist steering apparatus having the same,

The present invention relates to a speed reducer of an electric power assisted steering apparatus. More specifically, it reduces rattling noise caused by an increase in backlash caused by wear of a worm and a worm wheel, or a rattle noise caused by an impact transmitted through a wheel and a steering shaft from a road surface, And more particularly, to a reduction gear of an electric power assist steering apparatus and an electric power assist steering apparatus using the same.

1, the electric power assist steering apparatus 100 includes a steering wheel 102 disposed on a driver's seat and a steering shaft 106 connected to the steering wheel 102, A rack pinion mechanism portion 110 including a rack gear and a pinion gear for converting a rotational force inputted from the steering shaft 106 into a linear motion, a tie rod (not shown) at both ends, And a rack bar (112) having a knuckle arm (124).

The steering column 130 is connected to the steering wheel 102 to rotate with the steering wheel 102 and the other side to the pinion shaft 108 via a pair of universal joints 104 . The pinion shaft 108 is connected to the rack bar 112 via the rack pinion mechanism unit 110 and both ends of the rack bar 112 are connected to the wheels 126 of the vehicle through the tie rod 122 and the knuckle arm 124. [ Lt; / RTI >

The auxiliary power mechanism 140 includes a torque sensor 142 that senses a torque applied by the driver to the steering wheel 102 and outputs an electric signal proportional to the sensed torque and a torque sensor 142 that outputs an electric signal proportional to the sensed torque based on an electric signal transmitted from the torque sensor 142 An electronic control unit 144 for generating a control signal and a motor 146 for generating an auxiliary power based on the control signal transmitted from the electronic control unit 144 and an auxiliary power generated by the motor 146 to the steering shaft 106, And a speed reducer 150 having a worm 152 and a worm wheel 156 to transmit the worm 152 and the worm wheel 156 to each other.

Therefore, the electric power assist steering apparatus is configured such that the torque generated by the rotation of the steering wheel 102 is transmitted to the rack bar 112 via the rack pinion mechanism unit 110, and the auxiliary power generated by the motor 146 in accordance with the generated torque To the rack bar (112).

That is, the torque generated by the rotation of the steering wheel 102 and the auxiliary power generated by the motor 146 are combined to move the rack bar 112 in the axial direction.

2, the speed reducer 150 is provided with a worm shaft 254 formed with a worm 152, and a worm shaft 254 is provided at both ends of the worm shaft 254, The worm shaft 257 is installed to support the worm shaft 254 and the plug bolt 210 is fixed to the damping coupler 240 and the worm shaft bearing 254 in order to prevent the worm shaft 257 from being spaced in the axial direction of the worm shaft 254. [ 257, and the plug bolt 210 is fixed by the plug nut 220.

The worm shaft 254 is connected to the motor 146 via a damping coupler 240 so that the worm shaft 254 is rotated by driving of the motor 146.

A worm wheel 156 is provided on one side of the outer diameter of the worm 152 so as to be engaged with the worm 152 formed on the worm axis 254. The worm wheel 156 is connected to a steering wheel And the rotational force of the worm shaft 254 due to the driving of the motor 146 is transmitted to the steering shaft 106. [

The gear housing 260 is provided with a motor 146 for providing a driving force to the worm shaft 254 at one side of the gear housing 260 and a worm 152 and a worm wheel 156. The gear housing 260 includes a gear housing 260, The motor 146 is coupled to the bolt 250 by a motor cover 230.

The speed reducer of the electric power assist steering apparatus having the above structure controls the driving of the motor by the electronic control unit provided in the vehicle according to the driving condition of the vehicle, and the rotation of the worm shaft by the driving of the motor is controlled by the steering wheel And is transmitted to the steering shaft in addition to the rotational force, so that the steering operation state of the driver can be maintained smoothly and stably.

However, in the conventional reducer of the electric power assisted steering system, there is a problem that the manufacturing error and the assembling error are accumulated at the joint portion between the worm shaft and the motor shaft, and the rolling resistance of the worm shaft is increased, The rattling noise is generated by the backlash and the rattling noise transmitted from the road surface through the wheels and the steering shaft causes the driver to feel uncomfortable when operating the steering wheel .

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the rattle noise caused by an increase in backlash caused by wear of a worm and a worm wheel, The purpose of the present invention is to increase the sense of driver's steering by reducing the sense of hanging and turning resistance of the worm shaft bearing.

To achieve this object, an embodiment of the present invention provides a worm shaft bearing coupled to an end opposite to a motor shaft coupling portion of a worm shaft; And at least one hollow portion formed in a circumferential direction at a position in a direction in which the worm shaft and the worm wheel engage with each other so as to absorb the gap between the worm wheel and the worm wheel engaged with the worm shaft, And an elastic supporter disposed on the outer peripheral surface of the outer peripheral surface of the outer peripheral surface of the outer peripheral surface of the outer peripheral surface of the steering shaft.

According to another embodiment of the present invention, there is provided an electric power assist steering apparatus for assisting steering force of a steering wheel via a speed reducer and a motor, the speed reducer including: a worm shaft bearing coupled to an opposite end of a worm shaft; And at least one hollow portion formed in a circumferential direction at a position in a direction in which the worm shaft and the worm wheel engage with each other so as to absorb the gap between the worm wheel and the worm wheel engaged with the worm shaft, And an elastic supporter disposed between the first and second support members.

According to the present invention, it is possible to reduce rattle noise caused by an increase in backlash due to wear of a worm and a worm wheel, or a rattling noise caused by an impact transmitted through a wheel and a steering shaft from a road surface, Thereby increasing the steering feeling of the vehicle.

1 is a block diagram of a conventional electric power assist steering apparatus;
2 is a sectional view showing a speed reducer of a conventional electric power assist steering apparatus;
3 is an exploded perspective view of a speed reducer of an electric power assisted steering apparatus according to an embodiment of the present invention;
4 is a sectional view of a speed reducer of an electric power assisted steering apparatus according to an embodiment of the present invention;
5 is a front view showing a state of engagement of an elastic supporter and a support housing in a speed reducer of an electric power assisted steering apparatus 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 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."

FIG. 3 is an exploded perspective view showing a speed reducer of an electric power assisted steering apparatus according to an embodiment of the present invention, FIG. 4 is a sectional view showing a speed reducer of an electric power assisted steering apparatus according to an embodiment of the present invention, 1 is a front view showing a state of engagement of an elastic supporter and a support housing in a speed reducer of an electric power assisted steering apparatus according to an embodiment of the present invention.

As shown in these drawings, the speed reducer 300 of the electric power assisted steering apparatus according to the embodiment of the present invention includes a worm shaft bearing 257 coupled to an end opposite to the motor shaft coupling portion of the worm shaft 254; And the worm shaft 254 and the worm wheel 156 are coupled to each other so as to absorb the clearance between the worm shaft 254 and the worm wheel 156 engaged with the worm shaft 254, And an elastic support 310 having at least one hollow portion 313 formed in a circumferential direction at a position at which the elastic support 310 is disposed.

The gear housing 300 includes a support housing 320 which is coupled to the inner side of the gear housing 260 and which supports the elastic support body 310 in a hollow shape with one side to which the elastic support body 310 is coupled, ). ≪ / RTI >

The worm shaft bearing 257 coupled to the end of the worm shaft 254 and the opposite end of the worm shaft 254 coupled to the motor shaft supports the rotation of the worm shaft 254 by coupling the ball between the inner and outer rings.

The worm 152 and the worm wheel 156 interlock with each other by the driving force of the motor 146 to assist the driver in steering the steering shaft 106 by rotating the steering shaft 106. When the motor 146 is driven, The worm wheel 156 and the worm 152 that are coupled to the steering shaft 106 support the worm 152 and the worm 152. The worm 152 and the worm 152 are coupled to each other at both ends of the worm shaft 254, 260).

The worm shaft bearing 257 is mounted on the inner side of the gear housing 260 and supports the rotation of the worm shaft 254 at both ends of the worm shaft 254 and reduces the rotational resistance of the worm shaft 254, 106 are transmitted to the worm wheel 156, not only the axial direction but also the worm axis 254 engaged with the worm wheel 156 cause an elastic deformation that twists at a predetermined angle with the axial direction.

Therefore, the external force transmitted through the worm wheel 156 and the vibration generated due to the elastic deformation in which the worm 152 and the worm wheel 156 act to twist the worm axis 254 at a predetermined angle with respect to the axial direction or the axial direction The elastic support 310 is coupled to an end of the worm shaft 254 opposite to the coupling portion of the motor shaft 305 so as to absorb noise.

The elastic supporter 310 is coupled to the outer circumferential side of the worm shaft bearing 257. The elastic supporter 310 has at least one hollow portion 313 formed in the circumferential direction at a position in the direction in which the worm shaft and the worm wheel 156 mesh with each other. So that the clearance between the hollow portion 313 and the worm wheel 156 engaged with the worm shaft 254 can be absorbed while being elastically deformed.

The elastomeric support 310 may be made of a material such as natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene propylene terpolymer (EPDM), fluoroelastomer (FPM), styrene butadiene rubber ), CSM (Chlorosulphonated Polyethylene), silicone, urethane, and the like.

The elastic supporter 310 is provided with a plate support portion 315 for supporting the elastic deformation of the hollow portion 313 when the worm shaft 254 and the worm wheel 156 absorb the clearance. (156).

That is, the hollow portion 313 is formed in the circumferential direction at a position in the direction in which the worm shaft 254 and the worm wheel 156 are engaged, and the plate supporting portion 315 is formed in the center axis direction of the worm wheel 156, As shown in FIG.

The plate supporting portion 315 is formed at a position spaced apart from the hollow portion 313. The inner and outer circumferential surfaces are cut so that the inner and outer circumferential surfaces are connected to each other while the outer circumferential surface is open to the outside, And is coupled to the gear housing 260 or the support housing 320 to be described later, thereby fixing the position of the elastic support 310 and preventing rotation.

Both end portions of the plate supporting portion 315 passing through the inner and outer circumferential surfaces are formed in the radial direction from the inner circumferential surface and are formed in a "C" shape with wide end portions. When the hollow portion 313 is elastically deformed, As shown in Fig.

The plate support 315 is elastically deformed by itself when the impact is applied from the outside and supports the elastic deformation of the hollow portion 313. At the same time, the plate support 315 is fixed to the gear housing 260 and the support housing 320, Material or an engineering plastic material such as polyacetal (POM), polyamide (PA), polycarbonate (PC), polyimide (PI), polybutylene terephthalate (PBT)

One or more hollow portions 313 may be provided on the elastic supporter 310 and one each of the hollow portions 313 may be provided on one side and the other side in the circumferential direction of the plate supporter 315.

The hollow portion 313 may have a thickness different from that of the inner peripheral surface and the outer peripheral surface of the elastic supporter 310. The thickness of the hollow portion 313 with respect to the outer peripheral surface is smaller than the thickness of the elastic supporter 310 So that the worm wheel 254 is engaged with the worm wheel 156 while being firmly engaged with the gear housing 260 or the support housing 320 without any clearance. At the same time, So that the gap between the worm shaft 254 and the worm wheel 156 can be absorbed.

On the other hand, the support body 320 may be coupled to the outer side of the elastic support body 310.

The support housing 320 is coupled to the inside of the gear housing 260 while being coupled to the outside of the elastic support 310 to support the elastic support 310. The support housing 320 is closed at one side And is formed into a hollow shape.

The support body 320 is formed with a coupling groove 323 formed as a groove on the inner side to which the elastic supporter 310 is coupled. The coupling groove 323 has a worm axis 254 direction As shown in Fig.

Therefore, when the elastic supporter 310 absorbs the gap between the worm shaft 254 and the worm wheel 156, the protrusion 325 supports the elastic deformation of the hollow portion 313 while preventing the elastic supporter 310 from rotating.

The elastic supporting member 310 is coupled to the end of the worm shaft 254 opposite to the motor shaft coupling portion so that the external force transmitted from the road surface through the steering shaft and the worm wheel 156 and the operation of the worm 152 and the worm wheel 156 And reduces the rattle noise that can be generated in the reducer.

1, the speed reducer 300 according to an embodiment of the present invention may include a speed reducer and a motor 146. The speed reducer 300 may be an electric power assist steering device that assists the steerability of the steering wheel via the reducer and the motor 146, Thereby constituting one embodiment.

That is, a steering shaft 106 connected to the steering wheel, a steering column (see 130 in FIG. 1) for fixing the steering shaft to the vehicle body, and a steering column mounted on the steering column, A rack pinion mechanism portion (see 110 in FIG. 1) including a rack gear and a pinion gear for converting a rotational force inputted through the speed reducer 300 into linear motion, and a rack pinion mechanism portion And a rack bar (see 112 in FIG. 1) provided with an arm and the like, thereby constituting an electric power assist steering apparatus which is another embodiment of the present invention.

Here, since the speed reducer has been described in detail in the embodiment of the present invention as described above, the detailed description will be omitted.

According to the embodiments of the present invention having such a shape and structure, it is possible to reduce the rattle noise caused by the increase of backlash due to the wear of the worm and the worm wheel, or the rattling noise caused by the impact transmitted from the road surface through the wheel and the steering shaft, It is possible to reduce the hung feeling and rotational resistance of the worm shaft bearing, thereby increasing the steering feeling of the driver.

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

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

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

106: Steering axis 152: Worm
156: Worm wheel 254: Worm shaft
257: Worm shaft bearing 260: Gear housing
310: elastic support 313: hollow portion
315: plate support 320: support housing
323: fastening groove 325:

Claims (14)

A worm shaft bearing coupled to the opposite end of the worm shaft at the opposite side of the motor shaft; And
And at least one hollow portion formed in a circumferential direction at a position in a direction in which the worm shaft and the worm wheel engage with each other so as to absorb the gap between the worm wheel and the worm wheel engaged with the worm shaft, An elastic support,
Wherein the elastic support is provided at both ends of the worm wheel in the central axis direction and has a plate support portion which is formed at an outer circumferential surface of the worm wheel at a position spaced apart from the hollow portion, And the plate support portion is elastically deformed to support the elastic deformation of the hollow portion when the gap is absorbed. delete The method according to claim 1,
Wherein the plate supporting portion is formed in a shape in which both end portions are formed in the radial direction from the inner circumferential surface so as to support the deformation in the circumferential direction when the hollow portion is elastically deformed and the end portion thereof is spread wide, . The method according to claim 1,
Wherein the hollow portion is provided at one side and one side of the plate support portion in the circumferential direction of the plate support portion. 5. The method of claim 4,
Wherein the hollow portion has a thickness smaller than a thickness of the hollow portion with respect to an inner peripheral surface of the elastic supporter. 6. The method of claim 5,
And a support housing coupled to the inner side of the gear housing to support the elastic support in a hollow shape with one side to which the elastic support is coupled on the inner side thereof. The method according to claim 6,
Wherein the support housing is formed with a groove so as to press-fit the elastic supporter into an inner side surface of which one side is clogged, and a protruding portion protruding in a shape corresponding to the plate supporter is inserted into the supporter housing to absorb the gap between the worm shaft and the worm wheel Wherein the projection supports the elastic deformation of the hollow portion to prevent rotation of the elastic supporter. An electric power assist steering apparatus for assisting a steering force of a steering wheel via a speed reducer and a motor,
The speed reducer includes:
A worm shaft bearing coupled to the opposite end of the worm shaft at the opposite side of the motor shaft; And
And at least one hollow portion formed in a circumferential direction at a position in a direction in which the worm shaft and the worm wheel engage with each other so as to absorb the gap between the worm wheel and the worm wheel engaged with the worm shaft, An elastic support;
Wherein the power assisted steering apparatus comprises: 9. The method of claim 8,
Wherein the elastic support is provided at both ends of the worm wheel in the central axis direction and has a plate support portion which is formed at an outer circumferential surface of the worm wheel at a position spaced apart from the hollow portion, Wherein the plate support portion is elastically deformed to support the elastic deformation of the hollow portion when absorbing the clearance. 10. The method of claim 9,
Wherein the plate support portion is formed in a shape in which both end portions are formed in the radial direction from the inner circumferential surface so as to support the deformation in the circumferential direction when the hollow portion is elastically deformed, and the end portion thereof is wide open. 10. The method of claim 9,
Wherein the hollow portion is provided on one side and the other side of the plate support portion in the circumferential direction of the plate support portion. 12. The method of claim 11,
Wherein the hollow portion has a thickness smaller than a thickness of the hollow portion with respect to an inner peripheral surface of the elastic supporter. 13. The method of claim 12,
And a support housing which is coupled to the inner side of the gear housing to support the elastic support body in a hollow shape with one side to which the elastic support body is coupled, 14. The method of claim 13,
Wherein the support housing is formed with a groove so as to press-fit the elastic supporter into an inner side surface of which one side is clogged, and a protruding portion protruding in a shape corresponding to the plate supporter is inserted into the supporter housing to absorb the gap between the worm shaft and the worm wheel Wherein the protruding portion supports the elastic deformation of the hollow portion to prevent rotation of the elastic supporter.
KR1020100016289A 2010-02-23 2010-02-23 Reducer of Electronic Power Steering Apparatus and Electronic Power Steering Apparatus using The Same KR101405766B1 (en)

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KR101405766B1 true KR101405766B1 (en) 2014-06-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104691610A (en) * 2015-02-16 2015-06-10 宁波拓普智能刹车系统有限公司 Electric power steering scuffing-resistant worm device

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
KR101467027B1 (en) * 2012-04-13 2014-12-01 주식회사 만도 Reducer
KR101400488B1 (en) * 2013-04-15 2014-05-28 주식회사 만도 Reducer and electric power steering apparatus having the same
KR101491304B1 (en) * 2013-08-27 2015-02-06 주식회사 만도 Reducer of Electric Power Steering Apparatus
KR102151110B1 (en) * 2014-06-11 2020-09-02 현대모비스 주식회사 Bearing bush
KR102149910B1 (en) * 2014-10-27 2020-09-01 현대모비스 주식회사 Plug assembly in motor driven power steering system for vehicles
KR102540394B1 (en) * 2018-10-10 2023-06-08 현대자동차주식회사 A noise preventing structure of electronic power steering apparatus

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US6550567B2 (en) * 2000-05-10 2003-04-22 Koyo Seiko Co., Ltd. Electric power steering apparatus
KR20070060339A (en) * 2005-12-08 2007-06-13 현대모비스 주식회사 Reduction gear of c-eps
JP2007285472A (en) * 2006-04-19 2007-11-01 Nsk Ltd Reduction gear and electric power steering device having this reduction gear
JP2008143434A (en) * 2006-12-13 2008-06-26 Nsk Ltd Electric power steering device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6550567B2 (en) * 2000-05-10 2003-04-22 Koyo Seiko Co., Ltd. Electric power steering apparatus
KR20070060339A (en) * 2005-12-08 2007-06-13 현대모비스 주식회사 Reduction gear of c-eps
JP2007285472A (en) * 2006-04-19 2007-11-01 Nsk Ltd Reduction gear and electric power steering device having this reduction gear
JP2008143434A (en) * 2006-12-13 2008-06-26 Nsk Ltd Electric power steering device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104691610A (en) * 2015-02-16 2015-06-10 宁波拓普智能刹车系统有限公司 Electric power steering scuffing-resistant worm device

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