KR20010095546A - Torque limiter for motor driving type power steering system of automobile - Google Patents

Torque limiter for motor driving type power steering system of automobile Download PDF

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Publication number
KR20010095546A
KR20010095546A KR1020000018688A KR20000018688A KR20010095546A KR 20010095546 A KR20010095546 A KR 20010095546A KR 1020000018688 A KR1020000018688 A KR 1020000018688A KR 20000018688 A KR20000018688 A KR 20000018688A KR 20010095546 A KR20010095546 A KR 20010095546A
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South Korea
Prior art keywords
torque limiter
helical
wheel
plate
coupling end
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KR1020000018688A
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Korean (ko)
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KR100336470B1 (en
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최병윤
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밍 루
주식회사 만도
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Priority to KR1020000018688A priority Critical patent/KR100336470B1/en
Publication of KR20010095546A publication Critical patent/KR20010095546A/en
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Publication of KR100336470B1 publication Critical patent/KR100336470B1/en

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    • 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
    • B62D5/043—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 clutch means between driving element, e.g. motor, and driven element, e.g. steering column or steering gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • 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
    • B60Y2300/18—Propelling the vehicle
    • B60Y2300/184—Preventing damage resulting from overload or excessive wear of the driveline
    • B60Y2300/1845—Preventing of breakage of drive line components, e.g. parts of the gearing

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

Abstract

PURPOSE: A torque limiter of a vehicle power steering system is provided to prevent a speed reducer from being broken in applying load from a wheel to a rack and to a pinion gear or in generating excessive torque at a steering wheel and a motor. CONSTITUTION: A torque limiter is composed of a plate(30) installed in an assembling end(22); a worm wheel(40) having a helical through hole(41) crossing the assembling end, and sliding between the plate and an input axle(10) of the assembling end; plural pins(60) fitted to the assembling end, and inserted to the helical though hole; and elastic bodies(70,70') as coil spring connecting the worm wheel to the input axle of the assembling end and the plate. The worm wheel is rotated at excessive torque or load between the steering wheel and wheels of a vehicle, and turned against elastic force of the elastic bodies with inclining the helical through hole. The worm wheel relieves excessive torque and load by sliding for the input axle or reversely with rotation. The torque is efficiently relieved with setting the resilience of the elastic body and the tilt angle of the helical through hole corresponding to load.

Description

자동차의 전동식 파워 스티어링장치용 토오크 리미터{TORQUE LIMITER FOR MOTOR DRIVING TYPE POWER STEERING SYSTEM OF AUTOMOBILE}Torque limiter for electric power steering of automobiles {TORQUE LIMITER FOR MOTOR DRIVING TYPE POWER STEERING SYSTEM OF AUTOMOBILE}

본 발명은 토오크 리미터에 관한 것으로, 더욱 상세하게는 자동차의 전동식 파워 스티어링장치에 있어서 스티어링 휠이나 차륜측에서 과도한 회전력이나 하중이 입력될 경우에 이를 완화시키게 되는 자동차의 전동식 파워 스티어링장치용 토오크 리미터에 관한 것이다.The present invention relates to a torque limiter, and more particularly, to a torque limiter for an electric power steering apparatus of an automobile, in which the electric power steering apparatus of an automobile is alleviated when excessive rotational force or load is input from a steering wheel or wheel side. It is about.

일반적으로 자동차용 스티어링 장치에는 배력장치가 없는 매뉴얼 스티어링장치와, 유압의 힘으로 배력을 제공하는 유압식 파워 스티어링장치, 그리고 전동모터로써 배력을 제공하는 전동식 파워 스티어링장치가 있다.BACKGROUND ART In general, steering devices for automobiles include a manual steering device without a boosting device, a hydraulic power steering device providing hydraulic power using hydraulic power, and an electric power steering device providing power using an electric motor.

이 가운데, 상기 전동식 파워 스티어링장치에서는 스티어링 휠로부터 스티어링 칼럼 샤프트와 모터, 감속기, 랙과 피니언 기어를 거쳐 차륜으로 동력이 전달되는데, 만일 차륜측에서 랙과 피니언 기어측으로 큰 하중이 입력되거나, 스티어링 휠 및 모터에서 과도한 토오크가 발생하게 되는 경우에는 상기 감속기가 파손되는 사고가 일어나게 된다.Among these, in the electric power steering device, power is transmitted from the steering wheel to the wheel through the steering column shaft, the motor, the reducer, the rack and the pinion gear, and if a large load is input from the wheel side to the rack and the pinion gear, or the steering wheel And when excessive torque occurs in the motor accident occurs that the reducer is broken.

이러한 사고를 방지하기 위하여 클러치를 설치하기도 하지만, 이는 원가상승의 큰 요인이 되기 때문에 클러치를 대신한 토오크 리미터의 개발이 진행되고 있다.In order to prevent such an accident, a clutch may be installed. However, this is a great factor in the cost increase, and thus development of a torque limiter in place of the clutch is being developed.

본 발명은 전술한 바와 같이, 차륜측에서 랙과 피니언 기어측으로 큰 하중이입력되거나 스티어링 휠 및 모터에서 과도한 토오크가 발생하게 되는 경우에 감속기가 파손되는 사고를 미연에 방지할 수 있는 간단한 전동식 파워 스티어링장치용 토오크 리미터를 제공하는 데에 목적이 있다.As described above, the present invention provides a simple electric power steering capable of preventing an accident in which the reducer is damaged when a large load is input from the wheel side to the rack and pinion gear side or excessive torque is generated in the steering wheel and the motor. It is an object to provide a torque limiter for a device.

위와 같은 목적을 달성하기 위한 본 발명은, 조작기구의 입력축과 연결되어 조향력과 조향방향을 차륜측으로 전달하는 랙과 피니언기어를 포함한 전동식 파워 스티어링장치에 있어서, 상기 입력축과 결합된 상기 피니언기어의 결합단에 고정 장착되는 플레이트와; 상기 결합단의 축방향에 대각선방향으로 형성되는 헬리컬통공을 내면부에 구비하며, 상기 플레이트와 상기 결합단의 입력축쪽 단부 사이에 슬라이딩가능하게 장착되는 웜휠과; 상기 결합단에 압입된 채로 상기 헬리컬통공에 삽입되는 핀과; 상기 웜휠의 양면을 상기 결합단의 입력축쪽 단부 및 상기 플레이트와 각각 탄발적으로 연결하는 탄성체;로 이루어지는 것을 특징으로 한다.The present invention for achieving the above object, in the electric power steering apparatus including a rack and pinion gear connected to the input shaft of the operation mechanism to transmit steering force and steering direction to the wheel side, the combination of the pinion gear coupled to the input shaft A plate fixedly mounted at the end; A worm wheel having a helical through hole formed in a diagonal direction in the axial direction of the coupling end and slidably mounted between the plate and an input shaft end of the coupling end; A pin inserted into the helical through hole while being pressed into the coupling end; And an elastic body that elastically connects both sides of the worm wheel to the input shaft end of the coupling end and the plate, respectively.

도 1은 본 발명에 따른 토오크 리미터를 나타낸 단면도,1 is a cross-sectional view showing a torque limiter according to the present invention;

도 2는 도 1의 A부 관점에서의 단면도,2 is a cross-sectional view from the perspective of portion A of FIG. 1;

도 3은 본 발명에 따른 토오크 리미터의 작동시 상태를 나타낸 단면도.3 is a cross-sectional view showing a state in operation of the torque limiter according to the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for main parts of the drawings>

10 : 입력축 20 : 피니언기어10: input shaft 20: pinion gear

21 : 스크류형성부 22 : 결합단21: screw forming portion 22: coupling end

30 : 플레이트 40 : 웜휠30: plate 40: worm wheel

41 : 헬리컬동공 50 : 웜기어41: helical pupil 50: worm gear

60 : 핀 70,70' : 탄성체60: pin 70,70 ': elastic body

이하 본 발명의 바람직한 실시예를 첨부된 도면을 참조로하여 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

첨부도면 도 1은 본 발명에 따른 토오크 리미터를 나타낸 단면도이고, 도 2는 도 1의 A부 관점에서의 단면도이다.1 is a cross-sectional view showing a torque limiter according to the present invention, Figure 2 is a cross-sectional view from the perspective of the portion A of FIG.

본 발명은 전동식 파워 스티어링장치에 적용이 되는 바, 통상적으로 조향 조작기구의 스티어링 칼럼 샤프트로 대표되는 입력축(10)은 랙과 이에 맞물리는 피니언 기어(20)를 통하여 차륜과 연결된 링크기구와 연계된다.The present invention is applied to the electric power steering device, the input shaft 10 typically represented by the steering column shaft of the steering operation mechanism is associated with the link mechanism connected to the wheel through the rack and the pinion gear 20 engaged thereto. .

따라서, 입력축(10)으로부터 입력되는 조향력과 조향방향은 랙과 피니언기어(20)를 거쳐 차륜으로 전달이 되는데, 상기 피니언기어(20)는 랙과 맞물리는 스크류형성부(21)와 상기 입력축(10)에 결합되는 결합단(22)으로 구성되어 있다.Therefore, the steering force and the steering direction input from the input shaft 10 are transmitted to the wheel through the rack and the pinion gear 20, the pinion gear 20 is engaged with the rack and the screw forming portion 21 and the input shaft ( It consists of a coupling end 22 coupled to 10).

여기서, 본 발명은 상기 결합단(22)에 고정적으로 장착되는 플레이트(30)와; 상기 결합단(22)의 축방향에 대하여 대각선방향으로 형성되는 나선형의 헬리컬통공(41)을 내면부에 구비하면서, 상기 플레이트(30)와 상기 결합단(22)의 입력축(10)쪽 단부 사이에 슬라이딩가능하게 장착되는 웜휠(40)과; 상기 결합단(22)에 압입된 채로 상기 헬리컬통공(41)에 삽입되는 다수의 핀(60)과; 상기 웜휠(40)의 양면을 상기 결합단(22)의 입력축(10)쪽 단부 및 상기 플레이트(30)와 각각 탄발적으로 연결하는 코일스프링과 같은 탄성체(70,70');로 이루어진다.Here, the present invention and the plate 30 is fixedly mounted to the coupling end 22; While having a helical through hole 41 of a spiral formed in a diagonal direction with respect to the axial direction of the coupling end 22 in the inner surface, between the end of the plate 30 and the input shaft 10 side of the coupling end 22 A worm wheel 40 slidably mounted thereto; A plurality of pins 60 inserted into the helical through hole 41 while being pressed into the coupling end 22; And elastic bodies 70 and 70 'such as coil springs that both sides of the worm wheel 40 are elastically connected to the input shaft 10 end of the coupling end 22 and the plate 30, respectively.

특히, 상기 결합단(22)의 입력축(10)쪽 단부에 플랜지부(22a)를 형성함으로써, 이 플랜지부(22a)에 상기 탄성체(70)가 연결되도록 할 수도 있다.In particular, by forming the flange portion 22a at the end of the coupling end 22 on the input shaft 10 side, the elastic body 70 may be connected to the flange portion 22a.

그리고, 상기 플레이트(30)는 상기 피니언기어(20)의 결합단(22)에 코킹의 방법으로 고정시킬 수 있다.In addition, the plate 30 may be fixed to the coupling end 22 of the pinion gear 20 by caulking.

한편, 미설명 도면부호 50은 상기 윔휠(40)과 맞물려 회전하는 웜기어를 나타낸다.On the other hand, reference numeral 50 denotes a worm gear that rotates in engagement with the wheel wheel 40.

이와 같이 이루어진 본 발명의 작용을 설명하면 다음과 같다.Referring to the operation of the present invention made as described above are as follows.

차량의 정상적인 주행상태에서는 도 1에서와 같이 웜휠(40)이 탄성체(70,70')를 전혀 자극하지 않은 채, 결합단(22)의 입력축(10)쪽 단부와 플레이트(30) 사이에서 미동한다.In the normal driving state of the vehicle, as shown in FIG. 1, the worm wheel 40 does not stimulate the elastic bodies 70 and 70 ′ at all, and is finely moved between the plate 30 and the end of the coupling shaft 22. do.

그러다가 스티어링 휠과 차륜 사이에 과도한 토오크 또는 하중이 걸리게 되면, 도 3에서와 같이 웜휠(40)이 일정각도 회전변위를 발생시키게 되는데, 결합단(22)의 축방향에 대하여 대각선방향으로 형성되어 있는 헬리컬통공(41)의 경사에 의해 웜휠(40)이 탄성체(70,70')의 탄성을 극복하고 일정각도 회전하여 입력축(10)쪽 또는 그 반대쪽으로 슬라이딩하게 됨으로써 과도한 토오크 또는 하중을 완화시키게 되는 것이다.Then, when excessive torque or load is applied between the steering wheel and the wheel, as shown in FIG. 3, the worm wheel 40 generates a rotation angle at an angle, which is formed diagonally with respect to the axial direction of the coupling end 22. Due to the inclination of the helical through-hole 41, the worm wheel 40 overcomes the elasticity of the elastic bodies 70 and 70 'and rotates at an angle so as to slide toward the input shaft 10 or the other side to alleviate excessive torque or load. will be.

한편, 상기 탄성체(70,70')의 탄성과 헬리컬통공(41)의 경사각은 입력되는 하중과의 상관관계를 고려하여 적절하게 설정함으로써 과도한 토오크의 완화를 효과적으로 달성할 수가 있다.On the other hand, the elasticity of the elastic body (70, 70 ') and the inclination angle of the helical through hole 41 is properly set in consideration of the correlation between the input load can effectively achieve the reduction of excessive torque.

이상에서 설명한 바와 같이, 본 발명에 따른 자동차의 전동식 파워 스티어링장치용 토오크 리미터는, 간단한 구조로 이루어져, 차륜측에서 랙과 피니언 기어측으로 큰 하중이 입력되거나 스티어링 휠 및 모터에서 과도한 토오크가 발생하게 되는 경우에 감속기가 파손되는 사고를 미연에 방지할 수 있는 효과가 있다.As described above, the torque limiter for the electric power steering apparatus of the vehicle according to the present invention has a simple structure, in which a large load is input from the wheel side to the rack and pinion gear side or excessive torque is generated at the steering wheel and the motor. In this case, it is possible to prevent an accident in which the reducer is damaged in advance.

Claims (4)

조작기구의 입력축(10)과 연결되어 조향력과 조향방향을 차륜측으로 전달하는 랙과 피니언기어(20)를 포함한 전동식 파워 스티어링장치에 있어서,In the electric power steering apparatus including a rack and pinion gear (20) connected to the input shaft (10) of the operating mechanism to transmit steering force and steering direction to the wheel side, 상기 입력축(10)과 결합된 상기 피니언기어(20)의 결합단(22)에 고정 장착되는 플레이트(30)와; 상기 결합단(22)의 축방향에 대각선방향으로 형성되는 헬리컬통공(41)을 내면부에 구비하며, 상기 플레이트(30)와 상기 결합단(22)의 입력축(10)쪽 단부 사이에 슬라이딩가능하게 장착되는 웜휠(40)과; 상기 결합단(22)에 압입된 채로 상기 헬리컬통공(41)에 삽입되는 핀(60)과; 상기 웜휠(40)의 양면을 상기 결합단(22)의 입력축(10)쪽 단부 및 상기 플레이트(30)와 각각 탄발적으로 연결하는 탄성체(70,70');로 이루어지는 것을 특징으로 하는 자동차의 전동식 파워 스티어링장치용 토오크 리미터.A plate 30 fixedly mounted to the coupling end 22 of the pinion gear 20 coupled to the input shaft 10; A helical through hole 41 formed in a diagonal direction in the axial direction of the coupling end 22 is provided on the inner surface, and is slidable between the plate 30 and an end portion of the coupling end 22 toward the input shaft 10. A worm wheel 40 which is mounted securely; A pin 60 inserted into the helical through hole 41 while being pressed into the coupling end 22; An elastic body (70, 70 ') elastically connecting both sides of the worm wheel (40) with the input shaft (10) side end of the coupling end 22 and the plate (30), respectively; Torque limiter for electric power steering. 제1항에 있어서, 상기 결합단(22)의 입력축(10)쪽 단부에 상기 탄성체(70)가 연결되기 위한 플랜지부(22a)가 형성된 것을 특징으로 하는 자동차의 전동식 파워 스티어링장치용 토오크 리미터.The torque limiter for an electric power steering apparatus of claim 1, wherein a flange portion (22a) for connecting the elastic member (70) to the input shaft (10) side end of the coupling end (22) is formed. 제1항에 있어서, 상기 플레이트(30)는 상기 피니언기어(20)의 결합단(22)에코킹의 방법으로 고정되는 것으 특징으로 하는 자동차의 전동식 스티어링장치용 토오크 리미터.The torque limiter of claim 1, wherein the plate (30) is fixed to the coupling end (22) of the pinion gear (20). 제1항에 있어서, 상기 탄성체(70,70')는 코일스프링인 것을 특징으로 하는 자동차의 전동식 스티어링장치용 토오크 리미터.The torque limiter for an electric steering apparatus of claim 1, wherein the elastic bodies (70, 70 ') are coil springs.
KR1020000018688A 2000-04-10 2000-04-10 Torque limiter for motor driving type power steering system of automobile KR100336470B1 (en)

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KR100835193B1 (en) * 2003-10-29 2008-06-04 주식회사 만도 Electric power steering system

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KR101220362B1 (en) * 2006-10-16 2013-01-09 현대자동차주식회사 Torque li meter structure

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JPH05262243A (en) * 1992-03-18 1993-10-12 Koyo Seiko Co Ltd Motor-operating power steering device
JP3328719B2 (en) * 1993-12-07 2002-09-30 光洋精工株式会社 Power steering device
JP3579509B2 (en) * 1995-06-14 2004-10-20 光洋精工株式会社 Torque limiter and electric power steering device
JP3891646B2 (en) * 1997-07-18 2007-03-14 株式会社ショーワ Gear mounting structure of torque limiter interposition part in electric power steering device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100835193B1 (en) * 2003-10-29 2008-06-04 주식회사 만도 Electric power steering system

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