KR20110104647A - Damping device of motor driven power steering - Google Patents

Damping device of motor driven power steering Download PDF

Info

Publication number
KR20110104647A
KR20110104647A KR1020100023649A KR20100023649A KR20110104647A KR 20110104647 A KR20110104647 A KR 20110104647A KR 1020100023649 A KR1020100023649 A KR 1020100023649A KR 20100023649 A KR20100023649 A KR 20100023649A KR 20110104647 A KR20110104647 A KR 20110104647A
Authority
KR
South Korea
Prior art keywords
damper
housing
lock nut
power steering
motor
Prior art date
Application number
KR1020100023649A
Other languages
Korean (ko)
Other versions
KR101574807B1 (en
Inventor
김한준
Original Assignee
현대모비스 주식회사
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 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020100023649A priority Critical patent/KR101574807B1/en
Publication of KR20110104647A publication Critical patent/KR20110104647A/en
Application granted granted Critical
Publication of KR101574807B1 publication Critical patent/KR101574807B1/en

Links

Images

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
    • B62D5/0409—Electric motor acting on the steering column
    • B62D5/0412—Electric motor acting on the steering column the axes of motor and steering column being parallel
    • 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
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2300/00—Purposes or special features of road vehicle drive control systems
    • B60Y2300/02—Control of vehicle driving stability
    • B60Y2300/045—Improving turning performance, e.g. agility of a vehicle in a curve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/07—Facilitating assembling or mounting
    • 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

Abstract

The present invention not only reduces the sound source and vibration of the operation unit that generates the noise and operation sound in the belt drive unit, but also blocks the transmission to the outside of the system, facilitates the manufacture and reduces the friction, thereby improving the efficiency of the system. In order to provide a damping device for an electric power steering device, the drive motor is mounted between a housing and a motor damper interposed between the housing and absorbs and reduces vibration and noise. A housing damper and a lock nut damper are interposed between the rotatably supporting bearing and the housing and between the bearing and the lock nut, respectively.

Description

Damping device of motor driven power steering

The present invention relates to an electric power steering apparatus, and more particularly, to a damping apparatus of an electric power steering apparatus in which dampers are applied to both sides of a housing mounting portion and a ball nut of a motor.

Conventional vehicle steering apparatus includes a steering wheel that the driver directly steer, and a rack gear for steering the wheel while moving left and right by receiving the operating force of the steering wheel.

In addition, a power steering device that assists the driver's steering wheel steering force by generating hydraulic pressure or driving torque of the motor has been widely applied.In recent years, the electronic control device has a motor according to the driving conditions detected by the vehicle speed sensor and the steering torque sensor. The steering wheel makes the steering wheel lighter and more comfortable during low speed operation of the vehicle, while the steering wheel becomes heavier in the high speed driving, improving the steering stability and making the steering faster in an emergency. Electric power steering systems that provide optimum steering assistance are being applied in a trend.

The electric power steering apparatus is classified into various types according to the installation site of the motor, among which rack assist motor driven power steering (R-MDPS) directly transmits the driving torque of the motor to the rack gear. As shown in FIG. 1, a driving motor 1 generating a driving torque, a driving pulley 2 mounted integrally with the driving shaft of the driving motor 1, and a driving pulley 2 of the driving motor 1. Each of the belts 3 is connected to a drive pulley to transmit rotational force.

In addition, the driven pulley (4) wound around the belt (3) to receive the rotational force of the drive pulley (2) through the belt (3), and the ball nut coupled to the driven pulley (4) integrally rotated ( 5) A ball screw 6a is formed on the outer circumferential surface of the ball nut 5 to move left and right and steer the wheel, and the rack bar 6 coupled to the ball nut 5 and the ball. And a bearing 7 for rotatably supporting the nut 5, a lock nut 8, etc. for fixing the bearing 7, respectively.

In the rack assist type electric power steering apparatus as described above, when the driving motor 1 is rotated under the control current of the electronic controller, the rotational force of the driving motor 1 is driven through the belt 3 to the driven pulley ( 4) and assists the steering force of the steering wheel of the driver by generating a steering assistance force for moving the rack bar 6 to the left and right while the ball nut 5 is integrally rotated together with the driven pulley (4). Done.

However, in the conventional rack assist type electric power steering apparatus as described above, when the pulley, the belt, the ball nut, and the rack bar operate according to the driving of the driving motor, the operation noise and vibration of the driving motor are generated, and the driven pulley On the side, the ball friction sound inside the ball nut, the noise of the bearing and the joint, and the noise between the belt and the pulley are generated, and the vibration and the noise and the noise are transmitted to the housing surrounding the belt and the rack bar, generating a sound source wavelength effect Has had the drawback of lowering the NVH performance.

In addition, the vibration caused by the inertia of the drive motor is transmitted to the steering wheel through the rack bar to reduce the driving operation feeling, and is composed of a plurality of components to increase the weight of the system due to the excessive component, vibration and noise and There was a drawback that the propagation effect of noise is large.

The rack bar is supported by the yoke and the bush, and the driven part including the driven pulley and the ball nut supports the rack bar between or between the yoke and the bush. The structure of supporting the rack bar by aligning the center of the rack bar at the third point through the follower is complicated and difficult. There was concern that excessive friction could occur.

Accordingly, the present invention has been made in view of the above circumstances, and not only reduces the sound source and vibration of the operation unit that generates the noise and operation sound in the belt drive unit, but also blocks the transmission to the outside of the system, and is easy to manufacture. It is an object of the present invention to provide a damping device for an electric power steering system, which can reduce the friction and improve the efficiency of the system.

The present invention for achieving the above object is provided with a motor damper interposed between the drive motor mounted to the housing and the housing to absorb and reduce vibration and noise.

A housing damper and a lock nut damper are interposed between the bearing and the housing rotatably supporting the ball nut with respect to the housing, and between the bearing and the lock nut, respectively.

The motor damper and the housing damper are a damper body having a ring shape in which a central portion is perforated, and are axially protruded on one side of the damper body and are arranged at predetermined intervals in the circumferential direction and fitted into an assembly groove formed in the housing. It is characterized by having a plurality of fixing projections to be fixed.

The lock nut damper has a ring-shaped damper body having a central portion drilled in the axial direction, and is disposed at predetermined intervals in a circumferential direction on one side of the damper body and is inserted into and fixed to an assembly groove formed in the lock nut. It is characterized by having a fixing projection.

The motor damper, the housing damper, and the lock nut damper are made of NBR having a hardness of 45 to 70.

According to the damping device of the electric power steering apparatus according to the present invention, a damper is installed in the motor mounting portion of the housing, and the bearing for rotatably supporting the ball nut is coupled with one side of the bearing mounted on the housing and the lock nut. Each damper is installed on the side to reduce joint noise, operating noise, and abnormal vibration at the same time, while eliminating unnecessary clearance between parts, thereby improving responsiveness to steering, and centering rack bars and drives after assembly. Mechanical friction can be minimized by observing compliance effects and precision grades on moving parts can be reduced, reducing or eliminating finishing, roughness, degree of grinding, number and degree of lapping and processes. As a result, the cost can be reduced, and the parts can be easily managed in the ball nut and bearing parts. It can reduce the vibration and noise of the power steering system itself and block the inflow or transmission to the interior of the vehicle, thereby improving the NVH performance of the vehicle. In addition, in each unit, the automatic adjustment function can be implemented even for the deviation of concentricity caused by the error of the machining process.

1 is a cross-sectional view of the electric power steering apparatus according to the prior art,
2 is a perspective view of a motor damper according to the present invention;
3 is a perspective view of the electric power steering apparatus according to the present invention;
4 is a perspective view of a housing damper according to the present invention;
5 is a cross-sectional view of the electric power steering apparatus according to the present invention;
6 is an assembled and exploded perspective view of the lock nut and the lock nut damper according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the accompanying drawings.

2 shows a motor damper constituting the damping device of the electric power steering apparatus according to the present invention, that is, the motor damper 11 has a damper body 11a having a ring shape in which a central portion is perforated, and the damper. It is composed of a structure having a plurality of fixing projections (11b) protruding in one axis of the body (11a) in the axial direction and spaced in the circumferential direction.

Three fixing protrusions 11b are arranged at intervals of 90 degrees as an embodiment of the present invention. However, the fixing protrusions 11b may be formed in more or less number as long as it can be properly fixed to the housing to be described later.

The motor damper is preferably made of Nitrile Butadiene Rubber (Nitrile Butadiene Rubber) having a hardness of 45 to 70.

3 is a perspective view of a state in which a motor is mounted on the housing using the motor damper 11, and the fixing protrusion 11b is disposed on one side of the housing 13 to mount the driving motor 12. A plurality of assembling grooves are formed in the form of dug inwardly, and the plurality of assembling grooves are disposed to correspond to the plurality of fixing protrusions, thereby assembling the fixing protrusions 11b of the motor damper 11. When the driving motor 12 is fixed to the housing 13 after being inserted into each of the grooves, noise and vibration generated during the operation of the driving motor 12 are appropriately absorbed and reduced by the damper.

4 shows a housing damper 14 according to the present invention. The housing damper 14 includes a damper body 14a having a ring shape in which a central portion is perforated, similar to the motor damper 11. The damper body 14a has a plurality of fixing protrusions 14b protruding in the axial direction and spaced in the circumferential direction on one side thereof. Although it is arranged in, but may be properly fixed to the housing 13 may be formed in more or less than the number, the housing damper is preferably NBR (Nitrile Butadiene Rubber; nitrile butadiene having a hardness of 45 ~ 70 Rubber).

5 shows a state in which the housing damper 14 is fixed to the housing 13, that is, a bearing 16 and a housing for rotatably supporting the ball nut 15 with respect to the housing 13. The housing damper 14 is interposed therebetween so that the fixing protrusion 14b of the housing damper 14 is fitted into an assembly groove formed to correspond to the housing, thereby fixing the housing damper 14. Absorb and reduce vibration and noise through the bearing 16, and serves to block the previous day of the housing (13).

6 shows a lock nut damper according to the present invention, that is, the lock nut damper 17 has a ring-shaped damper body 17a having a center portion drilled similarly to the motor damper 11 and the housing damper 14. ) And a plurality of fixing protrusions 17b protruding in the axial direction and spaced in a circumferential direction on one side of the damper body 17a, and four fixing protrusions 17b are provided as an embodiment of the present invention. Although arranged at intervals of 90 degrees, the lock nut damper may be formed in a number more or less if it can be properly fixed to the lock nut 18, the lock nut damper is preferably NBR (Nitrile Butadiene Rubber) having a hardness of 45 ~ 70; Nitrile butadiene rubber).

In order to fix the lock nut damper 17 to the lock nut 18, a plurality of assembling grooves 18a are formed in the lock nut 18 at predetermined intervals in the circumferential direction, and the fixing protrusion 17b of the lock nut damper 17 is provided. ) Are fitted into the assembly grooves 18a to be assembled and fixed.

When the lock nut with the lock nut damper assembled as described above is opposite to the other side of the bearing 16 as shown in FIG. 5, the ball operating noise, the friction noise and the bearing noise inside the ball nut 15 are housed. It effectively blocks transmission to the vehicle, effectively absorbs and reduces vibrations and noises generated from the driven part, enables fine adjustment of the play, and eliminates unnecessary play between parts, thereby improving the response to steering. The compliance effect on the concentricity of the driven part reduces the friction of the system as a whole and facilitates the management of parts / assemblies.

11-motor damper 12-drive motor
13-Housing 14-Housing Damper
15-ball nut 16-bearing
17-lock nut damper 18-lock nut

Claims (6)

A damping device for an electric power steering apparatus having a motor damper interposed between a drive motor mounted to the housing and the housing to absorb and reduce vibration and noise. The damping device of the electric power steering apparatus according to claim 1, wherein a housing damper and a lock nut damper are interposed between the bearing and the housing rotatably supporting the ball nut with respect to the housing, and between the bearing and the lock nut. . The method of claim 1 or 2, wherein the motor damper and the housing damper is a damper body having a ring-shaped perforated central portion, and axially protruded on one side of the damper body and disposed at predetermined intervals in the circumferential direction Damping device for an electric power steering device characterized in that it has a plurality of fixing projections are fixed to the assembly groove formed in the housing. The damping device of claim 3, wherein the motor damper and the housing damper are made of NBR having a hardness of 45 to 70. The lock nut damper of claim 2, wherein the lock nut damper has a ring-shaped damper body having a central portion drilled in an axial direction on one side of the damper body, and is disposed at predetermined intervals in a circumferential direction to the assembly groove formed in the lock nut. Damping device for an electric power steering device characterized in that it has a plurality of fixing projections that are fitted and fixed. The damping device of an electric power steering apparatus according to claim 5, wherein the lock nut damper is made of NBR having a hardness of 45 to 70.
KR1020100023649A 2010-03-17 2010-03-17 Damping device of motor driven power steering KR101574807B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100023649A KR101574807B1 (en) 2010-03-17 2010-03-17 Damping device of motor driven power steering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100023649A KR101574807B1 (en) 2010-03-17 2010-03-17 Damping device of motor driven power steering

Publications (2)

Publication Number Publication Date
KR20110104647A true KR20110104647A (en) 2011-09-23
KR101574807B1 KR101574807B1 (en) 2015-12-04

Family

ID=44955294

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100023649A KR101574807B1 (en) 2010-03-17 2010-03-17 Damping device of motor driven power steering

Country Status (1)

Country Link
KR (1) KR101574807B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101661559B1 (en) * 2015-04-28 2016-10-04 주식회사 만도 Rack Assist Type Electric Power Steering Apparatus
KR20170028134A (en) 2015-09-03 2017-03-13 주식회사 만도 Locking nut
KR20200051385A (en) 2018-11-05 2020-05-13 현대자동차주식회사 Damping control method and system of steering system for vehicles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101661559B1 (en) * 2015-04-28 2016-10-04 주식회사 만도 Rack Assist Type Electric Power Steering Apparatus
KR20170028134A (en) 2015-09-03 2017-03-13 주식회사 만도 Locking nut
KR20200051385A (en) 2018-11-05 2020-05-13 현대자동차주식회사 Damping control method and system of steering system for vehicles
US10974762B2 (en) 2018-11-05 2021-04-13 Hyundai Motor Company Damping control method and system of steering system for vehicle

Also Published As

Publication number Publication date
KR101574807B1 (en) 2015-12-04

Similar Documents

Publication Publication Date Title
KR101261093B1 (en) Rack Assist Type Electric Power Steering System
KR101381047B1 (en) Rack Assist Type Electric Power Steering Apparatus
JP4875321B2 (en) Ball screw mechanism
KR101095979B1 (en) Electric power steering apparatus
KR101095978B1 (en) Electric power steering apparatus
US9802641B2 (en) Steering system
KR101204306B1 (en) Electric power steering device
KR100883554B1 (en) Electric Power Steering System having Compensational Means of Free Apartness of Worm Shaft
US20120199412A1 (en) Ball Screw And Steering Device Equipped With The Same
JP2005295773A (en) In-wheel motor mounting method
KR101208279B1 (en) Rack Assist Type Electric Power Steering Apparatus
JP5140494B2 (en) Worm support structure of steering assist device
KR20110104647A (en) Damping device of motor driven power steering
KR20090123208A (en) Noise reduction device for motor driven power steering system
KR20190111968A (en) Shaft coupling
JP5948540B2 (en) Power steering device
JP7217159B2 (en) Steering device and steering device manufacturing method
KR101650743B1 (en) Electric steering damping bush
KR101034099B1 (en) Device for supporting worm gear shaft of motor driven power steering system
JP2017127150A (en) Fixing structure of stator in motor
KR20150028887A (en) Electric power steering apparatus
KR20140037445A (en) Power transmission device of electric power steering apparatus
KR20110064018A (en) Motor driven power steering
KR20090082821A (en) Column assist type electric power steering system
KR101361366B1 (en) worm shaft connecting structure of motor driven steering system

Legal Events

Date Code Title Description
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
FPAY Annual fee payment

Payment date: 20181029

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20191028

Year of fee payment: 5