KR20140022613A - Damping coupler and reducer of electric power steering apparatus having the same - Google Patents

Damping coupler and reducer of electric power steering apparatus having the same Download PDF

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Publication number
KR20140022613A
KR20140022613A KR1020120088928A KR20120088928A KR20140022613A KR 20140022613 A KR20140022613 A KR 20140022613A KR 1020120088928 A KR1020120088928 A KR 1020120088928A KR 20120088928 A KR20120088928 A KR 20120088928A KR 20140022613 A KR20140022613 A KR 20140022613A
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KR
South Korea
Prior art keywords
magnetic force
force member
inner rotor
elastic body
worm shaft
Prior art date
Application number
KR1020120088928A
Other languages
Korean (ko)
Inventor
문성주
Original Assignee
주식회사 만도
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Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020120088928A priority Critical patent/KR20140022613A/en
Publication of KR20140022613A publication Critical patent/KR20140022613A/en

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Classifications

    • 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
    • B62D5/0409—Electric motor acting on the steering column
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/22—Arrangements for reducing or eliminating reaction, e.g. vibration, from parts, e.g. wheels, of the steering system
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/005—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/09—Reducing noise
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2238/00—Type of springs or dampers
    • F16F2238/04—Damper

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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 damping coupler and speed reducer for electric power steering device having the same. The present invention can absorb vibration between a drive shaft and a worm shaft and reduce noise by adding a repulsive magnetic force between magnet members by the damping force of an elastic body by installing the magnet members with the same poles to the inside and outside of the damping coupler.

Description

Damping Coupler and Reducer of Electric Power Steering Apparatus

The present invention relates to a damping coupler and a reducer of an electric power assisted steering apparatus including the same. More particularly, the repulsive force between magnetic members can be added to the damping force of an elastic body to absorb vibration generated between the drive shaft and the worm shaft. A damping coupler capable of reducing noise, and a reducer of an electric power assist steering device including the same.

Background Art [0002] Recent developments in the steering system of a vehicle include research and development in the direction of seeking the convenience of the driver together with safety such as stability of the steering condition and smooth and comfortable steering feeling. According to this development trend, various power assist steering devices, such as hydraulic or electric, are being developed as a way to improve the driver's steering feeling. The electric power is reduced due to the advantages of lighter electric, less energy consumption, and improved vehicle fuel economy than hydraulic. The use of auxiliary steering is on the rise.

In general, the electric power assist steering device assists the driver's steering torque by driving the motor in the electronic controller according to the driving conditions of the vehicle detected by the vehicle speed sensor and the torque sensor, thereby providing a light and comfortable steering state at low speed. In addition, it provides heavy and stable steering during high speed operation, and provides steering performance to maintain the optimal steering feeling for the driver, such as enabling rapid steering operation in response to sudden emergency situations.

1 is a block diagram of a conventional electric power assist steering device.

Referring to FIG. 1, the electric power assist steering device 100 includes an auxiliary power mechanism for providing steering assistance power to the steering system 130 and the steering system 130 that extend from the steering wheel 102 to both wheels 126. 140).

The steering system 130 has one side connected to the steering wheel 102 to rotate together with the steering wheel 102, the other side of the steering shaft connected to the pinion shaft 108 via a pair of universal joint 104 ( 106). 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 unit 140 includes a torque sensor 142 for sensing a torque applied to the steering wheel 102 by the driver and outputting an electric signal proportional to the sensed torque and an electric signal transmitted from the torque sensor 142 A motor 146 for generating a steering assist power based on a control signal transmitted from the electronic control unit 144; And a speed reducer (150) having a worm (152) and a worm wheel (156) for transmitting auxiliary power to the steering shaft (106).

Accordingly, in the electric power assist steering device, 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 steering assist generated in the motor 146 according to the generated torque. Power is configured to be delivered to the rack bar 112.

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

2 is a cross-sectional view showing a reducer of a conventional electric power assisted steering device.

Referring to FIG. 2, the reducer 150 includes a worm shaft 254 having a worm 152 formed thereon, and worm shaft bearings 257 are installed at both ends of the worm shaft 254 to support the worm shaft 254. The plug bolt 210 is fastened between the damping coupler 240 and the worm shaft bearing 257 to prevent 257 from being spaced in the axial direction of the worm shaft 254, and the plug bolt 210 is connected to the plug nut 220. It is fixed by).

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 at one side of the outer diameter of the worm 152 so that the worm 152 can be engaged with the worm 152 formed on the worm shaft 254. The worm wheel 156 is rotated by a torque of the steering wheel 102 And the steering assist force of the worm shaft 254 is transmitted to the steering shaft 106 by the driving of the motor 146. [

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 worm shaft bearing 257 has a ball 258 coupled between the inner ring 280 and the outer ring 270 to support the rotation of the worm shaft 254 connected to the motor 150 at the end of the gear housing 260 do.

The reducer of the electric power assisted steering device having such a structure controls the driving of the motor by the electronic control device provided in the vehicle according to the vehicle driving conditions, and the steering assist power of the worm shaft by the driving of the motor is controlled by the driver. In addition to the torque of the wheel is transmitted to the steering shaft, to maintain a smooth and stable steering state of the driver.

However, the damping coupler which absorbs vibrations of the worm shaft and the motor through the motor and the worm shaft in the reducer of the conventional electric power assisted steering device, vibrates the vibration absorbing member (for example, an elastic body made of rubber) therein over time. Absorption efficiency is reduced and there is a problem that the noise is severely generated.

Accordingly, the present invention has been made in the above-described background, it is possible to add the repulsive force between the magnetic members to the damping force of the elastic body to absorb the vibration generated between the drive shaft and the worm shaft, damping that can reduce the occurrence of noise The present invention provides a coupler and a reducer of an electric power assist steering device including the same.

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 one embodiment of the invention, the drive shaft for transmitting the power of the motor; A worm shaft for transmitting power of the worm gear; And a damping coupler for connecting the drive shaft and the worm shaft, wherein the damping coupler includes: an inner rotor connected to the worm shaft; An outer rotor connected to the drive shaft; An elastic body provided between the inner rotor and the outer rotor; A first magnetic force member provided on the inner rotor; And a second magnetic force member provided on the outer rotor to face the first magnetic force member so as to generate a repulsive force with the first magnetic force member. The speed reducer of the electric power assisted steering apparatus may be provided.

According to another embodiment of the present invention, the inner rotor having a plurality of projections formed radially projecting the first hole is formed in the center is formed a first hole in which the first serration parallel to the axial direction of the worm shaft; An outer rotor including a body having a second hole formed at a center thereof, the second hole having a second serration parallel to the axial direction of the drive shaft, and a housing formed to correspond to the shape of the inner rotor so that the inner rotor is inserted into the body; An elastic body provided between the inner rotor and the outer rotor; A first magnetic force member provided on the inner rotor; And a second magnetic force member provided on the outer rotor to face the first magnetic force member so as to generate a repulsive force with the first magnetic force member. A damping coupler may be provided.

According to this embodiment of the present invention, by installing a magnetic force member having the same pole on each of the inner rotor and the outer rotor of the damping coupler, it is possible to add a repulsive force between the magnetic force members to the damping force of the elastic body drive shaft and worm shaft The vibration generated in between can be absorbed and noise can be reduced.

1 is a block diagram of a conventional electric power assist steering device.
2 is a cross-sectional view showing a reducer of a conventional electric power assisted steering device.
3 is a cross-sectional view of a reducer of the electric power assisted steering device according to the embodiment of the present invention.
4 is an exploded perspective view of the damping coupler of FIG. 3.
5 is a cross-sectional view of the damping coupler of FIG. 3.

3 is a cross-sectional view of a reducer of the electric power assisted steering device according to the embodiment of the present invention. 4 is an exploded perspective view of the damping coupler of FIG. 3. 5 is a cross-sectional view of the damping coupler of FIG. 3.

3 to 5, the speed reducer 300 of the electric power assisted steering device includes a motor 301, a drive shaft 305, a worm shaft 335, a first bearing 350, a worm shaft gear 345, The second bearing 370, the compression screw 355, the compression spring 365, the gear housing 360, and the damping coupler 460 are included.

The motor 301 has a drive shaft 305 extending out of the motor housing. The boss 410 is connected to the end of the drive shaft 305. The boss 410 includes a hole 440 in which an axial serration is formed. The boss 410 of the drive shaft 305 is inserted into a second hole (not shown) formed in the body 421 of the outer rotor 315 to be described later.

The second bearing 370 and the first bearing 350 fix the worm shaft gear 345 toward the worm gear 340 installed on the steering shaft in which the torsion bar 330 is built. The compression spring 365 supports the worm shaft gear 345 in the direction of the worm gear 340 using the compression screw 355, and supports the second bearing 370. Accordingly, when the compression screw 355 is tightened, the compression screw 355 moves to compress the compression spring 365. As a result, the worm shaft gear 345 is firmly connected with the worm gear 340 by the compression force of the compression spring 365. To be bitten. A serration 450 is formed at the end of the worm shaft 335 and is connected to the first hole 445 in which the serration of the inner rotor 320 to be described later is formed.

The damping coupler 460 includes an inner rotor 320, an outer rotor 315, an elastic body 310, a first magnetic force member 402, and a second magnetic force member 432.

The inner rotor 320 has a first hole 445 in which a first serration 443 parallel to the axial direction of the worm shaft 335 is processed. The inner rotor 320 has a plurality of protrusions 405. The protrusion 405 is provided radially about the first hole 445. 4 and 5 illustrate an example in which four protrusions 405 are formed radially, but the number of protrusions 405 is not limited thereto.

The outer rotor 315 includes a body 421 and a housing 423. The body 421 has a second hole (not shown) in which a second serration (not shown) is parallel to the axial direction of the drive shaft 305. Alternatively, a bush may be inserted into the second hole (not shown), and the driving shaft 305 may be inserted into the bush.

The housing 423 is connected with the body 421. The housing 423 is formed to correspond to the shape of the inner rotor 320 so that the inner rotor 320 is inserted. The housing 423 has a structure in which a plurality of outer wall structures 429 including side walls 425 and a connecting wall 427 are connected to each other. The side walls 425 abut both sides of the elastic body 310 surrounding the protrusions 405 of the inner rotor 320. The connecting wall 427 connects the side walls 425. The connecting wall 427 covers the upper surface of the elastic body 310. The connecting wall 427 may be provided as a curved plate. 4 and 5 illustrate an example in which four outer wall structures 429 are connected to each other. 405) is formed corresponding to the number.

The elastic body 310 is provided between the inner rotor 320 and the outer rotor 315 when the inner rotor 320 is inserted into the outer rotor 315. For example, the elastic body 310 may be formed of a rubber material.

The first magnetic force member 402 is provided on the inner rotor 320. For example, the first magnetic force member 402 may be provided at both sides of the elastic body 310 surrounding the protrusion 405 of the inner rotor 320. The first magnetic force member 402 may be provided as a plate-shaped magnet. In addition, the first magnetic force member 402 may be located inside the elastic body 310. Alternatively, the first magnetic force member 402 may be inserted into and positioned in a space in which a portion of the elastic body 310 is cut out.

The second magnetic force member 432 is provided to the outer rotor 320. As an example, the second magnetic force member 432 is positioned opposite the first magnetic force member 402 to generate a repulsive force with the first magnetic force member 402 (ie, sidewalls 425 of the housing 423). It is fixed to). That is, the first magnetic force member 402 and the second magnetic force member 432 facing each other have the same polarity. Therefore, repulsive force is generated between the first magnetic force member 402 and the second magnetic force member 432.

In this way, the inner rotor 320 is provided with the first magnetic force member 402, and the outer rotor 315 is provided with the second magnetic force member 432 having the same polarity as the first magnetic force member 402, thereby providing an elastic body ( Repulsive force between the magnetic force members 402 and 432 may be added to the damping force of the 310 to absorb vibrations generated between the drive shaft 305 and the worm shaft 335 and to reduce noise.

According to this embodiment of the present invention, by installing a magnetic force member having the same pole on each of the inner rotor and the outer rotor of the damping coupler, it is possible to add a repulsive force between the magnetic force members to the damping force of the elastic body drive shaft and worm shaft The vibration generated in between can be absorbed and noise can be reduced.

305: drive shaft 315: outer rotor
320: inner rotor 335: worm shaft
402: first magnetic force member 432: second magnetic force member

Claims (5)

A drive shaft for transmitting power of the motor;
A worm shaft for transmitting power of the worm gear; And
It includes a damping coupler for mediating the connection between the drive shaft and the worm shaft,
The damping coupler is,
An inner rotor connected to the worm shaft;
An outer rotor connected to the drive shaft;
An elastic body provided between the inner rotor and the outer rotor;
A first magnetic force member provided on the inner rotor; And
A second magnetic force member provided on the outer rotor to face the first magnetic force member to generate repulsive force with the first magnetic force member;
Reducer of the electric power assisted steering apparatus comprising a. The method of claim 1,
The inner rotor has a first hole in which a first serration is formed in parallel with an axial direction of the worm shaft, and has a plurality of radially projecting protrusions.
The outer rotor may include a body having a second hole formed at a center thereof in which a second serration parallel to the axial direction of the drive shaft is movable; A housing connected to the body and formed to correspond to the shape of the inner rotor to insert the inner rotor;
Reducer of the electric power assisted steering apparatus comprising a. 3. The method of claim 2,
The housing includes:
Sidewalls surrounding each of the protrusions and abutting both sides of the elastic body;
A plurality of outer wall structures including a connection wall connecting the sidewalls and covering the top surface of the elastic body are provided in a plurality of connected structures.
The first magnetic force member is provided on both sides of the elastic body surrounding the protrusion,
And the second magnetic force member is provided on the sidewalls of the housing. An inner rotor having a plurality of protrusions radially projecting, the first hole having a first hole formed with a first serration parallel to the axial direction of the worm shaft;
An outer rotor including a body having a second hole formed at a center thereof, the second hole having a second serration in parallel with an axial direction of the drive shaft, and a housing connected to the body and configured to correspond to the shape of the inner rotor to insert the inner rotor;
An elastic body provided between the inner rotor and the outer rotor;
A first magnetic force member provided on the inner rotor; And
A second magnetic force member provided on the outer rotor to face the first magnetic force member to generate repulsive force with the first magnetic force member;
Damping coupler comprising a. 5. The method of claim 4,
The housing includes:
Sidewalls surrounding each of the protrusions and abutting both sides of the elastic body;
A plurality of outer wall structures including a connection wall connecting the sidewalls and covering the top surface of the elastic body are provided in a plurality of connected structures.
The first magnetic force member is provided on both sides of the elastic body surrounding the protrusion,
And the second magnetic force member is provided on the sidewalls of the housing.
KR1020120088928A 2012-08-14 2012-08-14 Damping coupler and reducer of electric power steering apparatus having the same KR20140022613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120088928A KR20140022613A (en) 2012-08-14 2012-08-14 Damping coupler and reducer of electric power steering apparatus having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120088928A KR20140022613A (en) 2012-08-14 2012-08-14 Damping coupler and reducer of electric power steering apparatus having the same

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KR20140022613A true KR20140022613A (en) 2014-02-25

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KR1020120088928A KR20140022613A (en) 2012-08-14 2012-08-14 Damping coupler and reducer of electric power steering apparatus having the same

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220032992A1 (en) * 2020-07-29 2022-02-03 Mando Corporation Steering device of vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220032992A1 (en) * 2020-07-29 2022-02-03 Mando Corporation Steering device of vehicle
US11767052B2 (en) * 2020-07-29 2023-09-26 Hl Mando Corporation Steering device of vehicle

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