KR20170040884A - Reducer of Electronic Power Steering Apparatus - Google Patents

Reducer of Electronic Power Steering Apparatus Download PDF

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Publication number
KR20170040884A
KR20170040884A KR1020150140091A KR20150140091A KR20170040884A KR 20170040884 A KR20170040884 A KR 20170040884A KR 1020150140091 A KR1020150140091 A KR 1020150140091A KR 20150140091 A KR20150140091 A KR 20150140091A KR 20170040884 A KR20170040884 A KR 20170040884A
Authority
KR
South Korea
Prior art keywords
housing
worm
receiving portion
worm shaft
worm wheel
Prior art date
Application number
KR1020150140091A
Other languages
Korean (ko)
Inventor
이준규
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 KR1020150140091A priority Critical patent/KR20170040884A/en
Publication of KR20170040884A publication Critical patent/KR20170040884A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
    • B62D5/046—Controlling the motor
    • B62D5/0472—Controlling the motor for damping vibrations
    • 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
    • B62D3/04—Steering gears mechanical of worm type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0454—Worm gears
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • F16H1/166—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel with members rotating around axes on the worm or worm-wheel

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

Abstract

The present invention relates to a speed reducer of an electric power assisted steering apparatus.
The present invention is characterized in that a worm wheel receiving portion having a worm wheel receiving portion accommodating a worm wheel and a worm receiving portion having a worm axis receiving portion accommodating the worm wheel is provided on one side of the worm wheel receiving portion, And a second housing having a first coupling surface and a second coupling surface formed on a lower side opposite to the first coupling surface to receive the worm shaft and to be coupled to the first housing.

Description

Technical Field [0001] The present invention relates to a reduction gear of an electric power assist steering apparatus,

The present invention relates to a speed reducer of an electric power assisted steering apparatus. More particularly, to prevent rattle noise caused by backlash due to abrasion of a worm shaft and a worm wheel, to prevent generation of rattle noise due to a shock load generated due to forward and backward rotation of the worm shaft and worm wheel or transmitted from the road surface along the steering shaft To a speed reducer of an electric power assisted steering apparatus capable of absorbing vibrations and impact sounds generated in a gear housing.

1, the electric power assist steering apparatus 100 includes a steering system 130 extending from a steering wheel 102 to both wheels 126, And an auxiliary power mechanism (140) for providing steering assist power to the system (130).

The steering system 130 includes a steering shaft 106 having one side connected to the steering wheel 102 and rotating with the steering wheel 102 and the other side connected 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-and-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 .

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 shaft 254 and a worm wheel 156 to transmit the worm wheel 254 and the worm wheel 156 to each other.

Accordingly, 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-and-pinion mechanism unit 110, and the torque generated by the motor 146 So that auxiliary power is transmitted 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, and worm shaft bearings 257 are provided at both ends of the worm shaft 254, respectively. A plug bolt 210 is installed between the damping coupler 240 and the worm shaft bearing 257 to prevent the worm shaft 254 from sliding in the axial direction of the worm shaft 254, .

Then, 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 shaft 254 so as to be engaged with the worm shaft 254. The worm wheel 156 is mounted on a steering shaft 106 that transmits the rotational force of the steering wheel operated by the driver And the rotational force of the worm shaft 254 by the driving of the motor 146 is transmitted to the steering shaft 106 through the worm wheel 156. [

The gear housing 260 is provided with a motor 146 for providing a driving force to the worm shaft 254 on one side of the gear housing 260 and a worm shaft 254 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 decelerator of the electric power assisted steering system, when the worm shaft and the worm wheel, which rotate by the driving of the motor, advance, the rattle is generated by the wear and rattle noise is generated due to the backlash.

Further, vibration and impact noise are generated in the gear housing due to the forward and reverse rotation of the worm shaft and the worm wheel, or due to the impact load transmitted from the road surface along the steering shaft.

In addition, there is a problem that the steering assist force that assists the steering wheel operating force of the driver can not be accurately provided.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a worm gear device that prevents a worm caused by abrasion of a worm shaft and a worm wheel, prevents rattle noise caused by backlash, And it is an object of the present invention to provide a reduction gear of an electric power assisted steering apparatus capable of absorbing vibration and impact noise generated in a gear housing due to an impact load transmitted along an axis.

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

In order to achieve the above object, according to the present invention, there is provided a worm gear device comprising a worm wheel receiving portion having a worm wheel receiving portion on one side thereof and a worm shaft receiving portion on an upper side thereof, And a second housing coupled to the first housing and having a second engagement surface formed on a lower side opposite to the first engagement surface to receive the worm shaft, the first housing having a first engagement surface, Lt; / RTI >

As described above, according to the present invention, in the speed reducer of the electric power assisted steering system, it is possible to prevent a clearance caused by abrasion of the worm shaft and the worm wheel, to prevent the occurrence of rattle noise due to backlash, And it is possible to absorb vibrations and impact sounds generated in the gear housing due to an impact load transmitted along the steering shaft from the road surface.

1 is a configuration diagram of a conventional electric power assist steering apparatus;
2 is a sectional view showing a speed reducer of a conventional electric power assisted steering apparatus,
3 is a perspective view of a speed reducer of the electric power assisted steering apparatus according to the present invention,
4 is an exploded perspective view of a speed reducer of an electric power assisted steering apparatus according to the present invention,
5 is a sectional view of a speed reducer of an electric power assisted steering apparatus according to the present invention,
6 is a perspective view showing a part of a speed reducer of an electric power assisted steering apparatus according to the present invention,
7 is an exploded perspective view of Fig.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

Unless specifically stated in the detailed description of the present invention, for convenience of description, the worm axis is referred to as an upper side and the opposite side (a worm wheel side) is designated as a lower side for convenience of explanation.

FIG. 3 is a perspective view of a speed reducer of an electric power assisted steering apparatus according to the present invention, FIG. 4 is an exploded perspective view of a speed reducer of the electric power assisted steering apparatus according to the present invention, and FIG. 6 is a perspective view showing a part of a speed reducer of the electric power assisted steering apparatus according to the present invention, and Fig. 7 is an exploded perspective view of Fig.

As shown in these drawings, the speed reducer of the electric power assisted steering apparatus according to the present invention includes a worm wheel receiving portion 317 at one side thereof for receiving the worm wheel 156, And a worm shaft receiving portion 325 on the upper side of which a worm shaft receiving portion 325 is provided and a center portion of the worm shaft receiving portion 325 is connected to a first engagement surface 311a And a second engagement surface 311b formed on the lower side opposite to the first engagement surface 311a to receive the worm shaft and to be coupled to the first housing 310a, (310b).

First, the gear housing 310 is separated into a first housing 310a and a second housing 310b, and the gear housing 310 is separated from the first housing 310a and the second housing 310b And a worm wheel 156 is mounted on one side of the second housing 310b coupled to the first housing 310a so as to be engaged with the worm shaft. And transmits the rotational force of the worm shaft through the worm wheel 156 to the steering shaft 106 by driving the motor.

The first housing 310a is formed with a cylindrical worm wheel receiving portion 317 which surrounds the worm wheel 156. The worm wheel receiving portion 317 has a steering shaft receiving hole 319 And a worm wheel receiving portion 317 which is opened on the upper side facing the second housing 310b and accommodates the worm shaft is provided.

The center of the worm shaft receiving portion 325 is formed with a first engagement surface 311a cut in the vertical direction, that is, in a direction in which the worm shaft and the worm wheel 156 are engaged with each other, 311b and a predetermined gap t.

The second housing 310b has a second engaging surface 311b formed at a lower end thereof opposite to the first engaging surface 311a of the first housing 310a so that the worm shaft receiving portion 325 of the first housing 310a, And the worm axis.

The first engagement surface 311a of the first housing 310a and the second engagement surface 311b of the second housing 310b are fastened to the first engagement surface 311a by the fastening member 320, And a second coupling hole 315 communicating with the first coupling hole 313 is formed in the second coupling surface 311b through the outer side of the first housing 310a.

Therefore, when a clearance due to abrasion occurs after the operation duration of the worm shaft and the worm wheel 156 has progressed, the fastening member 320 is tightened so that the first housing 310a and the second housing 310b are brought close to each other, The clearance between the first coupling surface 311a and the second coupling surface 311b is reduced and the gap between the worm shaft and the worm wheel 156 can be compensated.

The worm shaft receiving portion 325 of the first housing 310a is formed with a seating groove 321 formed by cutting both sides of the inner circumference of the worm shaft 321. The seating groove 321 is formed with a first housing 310a, 2 housing 310b and a damping member 320 that absorbs impact.

The second housing 310b is provided with a support portion 323 protruding downward to support the damping member 320 at a position corresponding to the seating groove 321 of the first housing 310a, The support portion 323 is coupled while supporting the damping member 320 when the first housing 310a and the second housing 310b are fastened by the fastening member 320. [

The damping member 320 includes an inner member 331 formed in a rectangular shape corresponding to the seating groove 321 of the first housing 310a and an elastic member 333 coupled to the outer peripheral side of the inner member 331, Respectively.

The outer surface of the inner member 331 is formed with an engaging surface 331a which is stepped inwardly. An annular elastic member 333 is coupled to the engaging surface 331a. The inner member 331, A cutting hole 335 is formed through the upper and lower surfaces.

Here, the inner member 331 is made of an engineering plastic material such as polyacetal (POM), polyamide (PA), polycarbonate (PC), polyimide (PI), polybutylene terephthalate And the vibration transmitted through the elastic member 333 can be efficiently absorbed by the cutout hole 335 passing through the upper and lower side surfaces and the weight of the inner member 331 can be reduced .

The elastic member 333 is made of NR (natural rubber), BR (polybutadiene rubber), NBR (nitrile butadiene rubber), CR (chloroprene rubber), EPDM (ethylene propylene terpolymer), FPM ), SBR (Styrene Butadine Rubber), Chlorosulphonated Polyethylene (CSM), silicone, urethane, and the like.

The speed reducer of the electric power assist steering apparatus having such a 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 turning force of the worm shaft by the driving of the motor is operated by the driver through the worm wheel Is transmitted to the steering shaft in addition to the rotational force of the steering wheel (102 in FIG. 1), so that the steering operation state of the driver can be maintained smoothly and stably.

As described above, the speed reducer of the electric power assisted steering apparatus according to the present invention prevents the worm caused by abrasion of the worm shaft and the worm wheel and prevents the generation of rattle noise due to backlash. The worm shaft and the worm wheel rotate in the forward direction and the reverse direction Or vibration and impact noise generated in the gear housing due to an impact load transmitted along the steering shaft from the road surface can be absorbed.

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.

310: gear housing 310a: first housing
310b: second housing 311a: first coupling surface
311b: second coupling surface 313: first coupling hole
315: second fastening hole 317: worm wheel receiving portion
320: fastening member 321:
323: Support part 325: Worm shaft receiving part

Claims (7)

And a worm shaft receiving portion having a worm wheel receiving portion for receiving the worm wheel and a worm shaft receiving portion for receiving the worm shaft is provided on one side of the worm wheel receiving portion, and a first coupling surface formed by cutting the central portion of the worm receiving portion, A first housing;
A second housing having a second coupling surface formed on an underside of the first coupling surface and receiving the worm shaft and coupled with the first housing;
And a reduction gear of the electric power assisted steering device. The method according to claim 1,
Wherein a first fastening hole is formed in the first engaging surface and a second fastening hole communicating with the first fastening hole is formed in the second engaging surface so as to penetrate to the outside of the first housing to be fastened to the first fastening hole and the second fastening hole, And a member is fastened to the outer ring. 3. The method of claim 2,
The worm shaft receiving portion of the first housing is formed with a receiving groove formed by cutting both sides of the inner circumferential surface of the worm shaft, and the receiving groove is coupled with a damping member for absorbing vibrations and impact transmitted to the first housing and the second housing Wherein the power-assisted steering apparatus includes a power-assisted steering device. The method of claim 3,
Wherein the second housing includes a support portion protruding downward to support the damping member at a position corresponding to the seating groove. ≪ Desc / Clms Page number 19 > The method of claim 3,
Wherein the damping member includes an inner member formed in a rectangular shape corresponding to the seating groove and an elastic member coupled to an outer peripheral side of the inner member. 6. The method of claim 5,
Wherein an inner surface of the inner member has a coupling surface formed to be stepped inward, and the elastic member is coupled to the coupling surface. 6. The method of claim 5,
Wherein the inner member is provided with a cutting hole penetrating the upper side and the lower side and being cut out.
KR1020150140091A 2015-10-06 2015-10-06 Reducer of Electronic Power Steering Apparatus KR20170040884A (en)

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Applications Claiming Priority (1)

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KR1020150140091A KR20170040884A (en) 2015-10-06 2015-10-06 Reducer of Electronic Power Steering Apparatus

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KR20170040884A true KR20170040884A (en) 2017-04-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108860289A (en) * 2018-08-10 2018-11-23 深圳科尔马科技有限公司 Two sides transmission turning system and vehicle
KR20200076052A (en) * 2018-12-19 2020-06-29 주식회사 만도 Electric Power Steering Apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108860289A (en) * 2018-08-10 2018-11-23 深圳科尔马科技有限公司 Two sides transmission turning system and vehicle
KR20200076052A (en) * 2018-12-19 2020-06-29 주식회사 만도 Electric Power Steering Apparatus

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