KR20080007975A - Worm wheel and steering column fixing structure for motor driven power steering system in vehicle - Google Patents

Worm wheel and steering column fixing structure for motor driven power steering system in vehicle Download PDF

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Publication number
KR20080007975A
KR20080007975A KR1020060067273A KR20060067273A KR20080007975A KR 20080007975 A KR20080007975 A KR 20080007975A KR 1020060067273 A KR1020060067273 A KR 1020060067273A KR 20060067273 A KR20060067273 A KR 20060067273A KR 20080007975 A KR20080007975 A KR 20080007975A
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South Korea
Prior art keywords
steering
worm wheel
steering column
vehicle
column
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KR1020060067273A
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Korean (ko)
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권형주
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현대모비스 주식회사
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Priority to KR1020060067273A priority Critical patent/KR20080007975A/en
Publication of KR20080007975A publication Critical patent/KR20080007975A/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
    • B62D5/0409—Electric motor acting on the steering column
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
    • B62D5/005—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup means for generating torque on steering wheel or input member, e.g. feedback
    • 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
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0213—Support of worm gear shafts

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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

A steering column fixing structure for a motor driven power steering system for a vehicle is provided to prevent rapid change of steering effort sensed by a driver by damping rapid change of motor torque by a steering column connected to a worm wheel. A steering column fixing structure for a motor driven power steering system for a vehicle transmits rotation output torque to a gear box through a worm shaft(3), a worm wheel(7) engaged to the worm shaft, and a steering column(9) according to steering force of a driver. The worm wheel and steering column are combined with each other by a damping connection unit made of rubber having elasticity for absorbing rapid output torque of a motor(2) transmitted through the worm shaft and worm wheel.

Description

차량용 전동 스티어링 장치의 스티어링 컬럼 결합구조{Worm wheel and steering column fixing structure for motor driven power steering system in vehicle}Worm wheel and steering column fixing structure for motor driven power steering system in vehicle}

도 1은 본 발명에 따른 차량용 전동 스티어링 장치의 스티어링 컬럼 결합구조의 구성도1 is a configuration of the steering column coupling structure of the vehicle electric steering apparatus according to the present invention

<도면의 주요부분에 대한 부호의 설명>    <Description of the symbols for the main parts of the drawings>

1 : 구동수단 2 : 모터1: driving means 2: motor

3 : 웜축 4,6 : 하우징3: worm shaft 4,6: housing

5 : 전달수단 7 : 웜휠5: transmission means 7: worm wheel

7a : 결합홀 8 : 웜휠보스단7a: coupling hole 8: worm wheel boss end

8a,8b,8c,8d : 제1·2·3·4보스 9 : 스티어링컬럼8a, 8b, 8c, 8d: 1st, 2nd, 3rd and 4th bosses 9: Steering column

10 : 컬럼보스단 10: column boss

10a,10b,10c,10d : 제1·2·3·4보스10a, 10b, 10c, 10d: 1st, 2nd, 3rd and 4th bosses

11 : 부싱11: bushing

본 발명은 차량용 전동 스티어링 장치에 관한 것으로, 보다 상세하게는 급격한 토크 전달 시 이를 완충할 수 있도록 된 차량용 전동 스티어링 장치의 웜휠과 스티어링 컬럼 결합구조에 관한 것이다.The present invention relates to an electric steering apparatus for a vehicle, and more particularly, to a worm wheel and steering column coupling structure of the electric steering apparatus for a vehicle, which is capable of buffering a sudden torque transmission.

일반적으로 차량의 조타력을 발생하는 파워 스티어링장치는 핸들의 조작력을 가볍고 원활하게 하면서도 신속한 조향이 가능하도록 하기 위해서 유압을 이용하도록 설계되어 작동된다.In general, a power steering device that generates steering force of a vehicle is designed and operated to use hydraulic pressure in order to enable quick steering while lightly and smoothly operating a steering force.

이와 같은, 파워 스티어링 장치는 작은 힘으로 조향 조작을 할 수 있으며 조향기어비의 조작력에 관계없이 선정할 수 있으며, 노면의 요철에서 오는 충격을 흡수하여 핸들에 전달되는 것을 방지할 수 있는 등의 이점이 있다.Such a power steering device can be steered with a small force, can be selected regardless of the steering force of the steering gear ratio, and can be prevented from being transmitted to the handle by absorbing the impact from the unevenness of the road surface. have.

또한, 최근에는 차속센서 및 조향토크센서 등에서 감지한 차량의 운행조건에 따라 전자제어장치(ECU)에서 모터를 구동시켜 저속 운행 시에는 가볍고 편안한 조향감을 부여하고, 고속 운행 시에는 무거운 조향감과 더불어 양호한 방향 안정성을 부여하며, 비상상황에서는 급속한 조향이 이루어지도록 하여 운전자에게 최적의 조향 조건을 제공하는 전동식 스티어링 장치를 이용하고 있는 추세이다. In addition, in recent years, the electronic control unit (ECU) drives the motor according to the vehicle's driving conditions detected by the vehicle speed sensor and the steering torque sensor to provide a light and comfortable steering feeling at low speed, and a heavy steering feeling at high speed. Directional stability is provided, and in an emergency situation, a trend is to use an electric steering device that provides an optimum steering condition to the driver by enabling rapid steering.

이러한 전동식 스티어링 장치는 통상 EHPS(Electro-hydraulic Power Steering)이나 또는 MDPS(Motor Driven Power Steering)가 있으며, 이중 MDPS 시스템은 펌프에서 유압을 형성하여 파워를 어시스트(assist)하는 유압 시스템과 달리 모터의 회전력으로 조향 파워를 어시스트(assist)하는 구조로서, 동력을 발생하는 모터와 연결된 웜축(Worm-Shaft)이 스티어링샤프트(Steering-Shaft)와 연결되어 있 는 웜휠(Worm Wheel)을 회전 시켜 조향력을 어시스트(assist)하게 된다. Such electric steering system is usually EHPS (Electro-hydraulic Power Steering) or Motor Driven Power Steering (MDPS), the dual MDPS system, unlike the hydraulic system that forms the hydraulic pressure in the pump to assist the power (rotational power of the motor) As a structure that assists steering power, the worm shaft connected to the power generating motor rotates the worm wheel connected to the steering shaft to assist the steering power. assisted.

그러나, 이와 같은 전동 타입에서 조향 조작을 수행하는 스티어링 컬럼은, 모터의 동력을 받는 웜축과 치합된 웜휠의 회전력을 직접 전달받도록 강 결합되어 모터의 출력 토크(Torque)가 웜축과 웜휠의 기어 비를 곧바로 전달되며, 이는 모터에서의 순간적으로 급격한 토크가 전달될 경우 스티어링 휠을 통해 운전자가 느끼는 스티어링 에포트(Steering Effort)의 급격한 변화를 직접 전달받을 수 있는 취약함이 있게 된다.However, the steering column performing steering operation in this electric type is strongly coupled so as to receive the rotational force of the worm wheel engaged with the worm shaft powered by the motor directly, so that the output torque of the motor changes the gear ratio of the worm shaft and the worm wheel. It is delivered immediately, which is vulnerable to direct transmission of a sudden change in the steering effort felt by the driver through the steering wheel when instantaneous rapid torque is transmitted from the motor.

이에 본 발명은 상기와 같은 점을 감안하여 발명된 것으로, 조향 조작 시 동력을 발생하는 모터의 급격한 토크 변화 시 웜휠과 결합된 스티어링 컬럼 부위에서 완충 작용을 해, 모터에서 발생된 순간적인 급격한 토크 변화 시에도 운전자에게 직접적으로 전달하지 않아 운전자가 느끼는 스티어링 에포트(Steering Effort)의 급격한 변화를 발생시키지 않도록 함에 그 목적이 있다.Therefore, the present invention has been invented in view of the above, and in the case of a sudden torque change of the motor generating power during steering, a shock absorbing action is performed at the steering column portion coupled with the worm wheel, and the sudden sudden torque change generated in the motor The purpose is to prevent the driver from experiencing a sudden change in the steering effort, which is not transmitted directly to the driver.

상기와 같은 목적을 달성하기 위한 본 발명은, 운전자의 조타력을 모터의 회전 출력 토크를 웜축과 이에 치합 된 웜휠 및 웜휠에 결합된 스티어링 컬럼을 통해 기어박스를 쪽으로 전달하는 전동 스티어링 장치에 있어서, In the present invention for achieving the above object, in the electric steering apparatus for transmitting the steering force of the driver to the gearbox through the steering column coupled to the worm shaft and the worm wheel and worm wheel coupled to the rotation output torque of the motor,

상기 웜축과 웜휠을 통해 전달되는 모터의 급격한 출력 토크를 흡수해 완충하도록, 상기 웜휠과 스티어링 컬럼이 탄성력을 갖는 고무재질로 이루어진 완충결합수단으로 결합되어진 것을 특징으로 한다.The worm wheel and the steering column are coupled by a shock absorbing means made of a rubber material having elastic force to absorb and absorb the sudden output torque of the motor transmitted through the worm shaft and the worm wheel.

여기서, 상기 완충결합수단은 웜휠에 형성된 중공의 결합홀에서 돌출 된 웜휠보스단과, 상기 웜휠보스단에 결합되는 스티어링컬럼에 돌출 된 컬럼보스단 및 상기 보스단사이에 위치되어져 가해지는 회전 토크를 완충·흡수하는 부싱으로 구성되며, 상기 웜휠보스단은 결합홀내에서 서로 대칭을 이루도록 90°간격을 갖는 제1·2·3·4보스로 이루어지고, 상기 컬럼보스단도 스티어링컬럼의 외주면에서 서로 대칭을 이루도록 90°간격을 갖는 제1·2·3·4보스로 이루어진 것을 특징으로 한다.Here, the buffer coupling means buffers the rotational torque that is located between the worm wheel boss end protruding from the hollow coupling hole formed in the worm wheel, and the column boss end protruding from the steering column coupled to the worm wheel boss end and the boss end. The worm wheel boss stage is composed of first, two, three, and four bosses having a 90 ° interval so as to be symmetrical with each other in the coupling hole, and the column boss ends are symmetrical with each other on the outer circumferential surface of the steering column. It is characterized by consisting of the first, second, third, fourth boss having a 90 ° intervals to achieve.

이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 차량용 전동 스티어링 장치의 스티어링 컬럼 결합구조의 구성도를 도시한 것인바, 본 발명의 전동 스티어링 장치는 하우징(4)에 장착되어 운전자의 조타력을 모터(2)의 회전력을 통해 조향 파워를 어시스트(assist)하도록 모터(2)로부터 회전력을 전달받는 웜축(3)으로 이루어진 구동수단(1)과, 하우징(6)에 수용되어져 상기 웜축(3)과 치합된 상태에서 웜축(3)의 회전에 따라 기어박스에 연결된 스티어링 컬럼(9)을 회전시켜 운전자의 조타력에 따른 조작력을 전달하는 웜휠(7)로 이루어진 전달수단(5)으로 이루어지되, 1 is a block diagram of a steering column coupling structure of a vehicle electric steering apparatus according to the present invention, the electric steering apparatus of the present invention is mounted to the housing (4) is the steering force of the driver to rotate the torque of the motor (2) The drive means (1) consisting of a worm shaft (3) receiving a rotational force from the motor (2) to assist the steering power through (assist), and is accommodated in the housing (6) and the worm shaft in the state engaged with the worm shaft (3) Rotation of the steering column (9) connected to the gearbox according to the rotation of the (3) consists of a transmission means (5) consisting of a worm wheel (7) for transmitting the operating force according to the driver's steering force,

상기 웜축(3)과 웜휠(7)을 통해 전달되는 모터(2)의 급격한 출력 토크를 흡수해 완충하도록, 상기 웜휠(7)을 통해 회전되도록 웜휠(7)과 스티어링 컬럼(9)간을 결합하는 완충결합수단이 더 구비되어진다.Coupling between the worm wheel (7) and the steering column (9) to rotate through the worm wheel (7) to absorb and cushion the sudden output torque of the motor (2) transmitted through the worm shaft (3) and the worm wheel (7) A buffer coupling means is further provided.

여기서, 상기 완충결합수단은 웜휠(7)에 형성된 중공의 결합홀(7a)에서 돌출 된 웜휠보스단(8)과, 상기 웜휠보스단(8)에 결합되는 스티어링컬럼(9)에 돌출 된 컬럼보스단(10) 및 상기 보스단(8,10)사이에 위치되어져 가해지는 회전 토크를 완충·흡수하는 부싱(11)으로 구성되어진다.Here, the buffer coupling means is a column protruding from the worm wheel boss end (8) protruding from the hollow coupling hole (7a) formed in the worm wheel (7), the steering column (9) coupled to the worm wheel boss end (8) It consists of a bushing 11 which cushions and absorbs rotational torque which is located between the boss stage 10 and the boss stages 8 and 10.

또한, 상기 웜휠보스단(8)은 결합홀(7a)내에서 소정각도를 갖는 제1·2·3·4보스(8a,8b,8c,8d)로 이루어지며, 서로 대칭을 이루도록 90°간격을 갖도록 형성됨은 물론이다.In addition, the worm wheel boss stage 8 is composed of first, second, third, and fourth bosses 8a, 8b, 8c, and 8d having a predetermined angle in the coupling hole 7a, and are spaced 90 ° so as to be symmetric with each other. Of course, it is formed to have.

그리고, 상기 컬럼보스단(10)도 스티어링컬럼(9)의 외주면에서 소정각도를 갖는 제1·2·3·4보스(10a,10b,10c,10d)가 서로 대칭을 이루도록 90°간격을 갖도록 형성되며, 상기 제1·2·3·4보스(10a,10b,10c,10d)는 웜휠보스단(8)의 제1·2·3·4보스(8a,8b,8c,8d)간 사이에 형성되는 간격에 비해 상대적으로 작게 즉, 삽입되었을 때 틈을 형성하여 부싱(11)의 양 측면으로 위치되어짐은 물론이다.In addition, the column boss stage 10 also has a 90 ° interval so that the first, second, third, and fourth bosses 10a, 10b, 10c, and 10d having a predetermined angle on the outer circumferential surface of the steering column 9 are symmetric to each other. The first, second, third and fourth bosses 10a, 10b, 10c, and 10d are formed between the first, second, third, and fourth bosses 8a, 8b, 8c, and 8d of the worm wheel boss stage 8. Relatively small compared to the spacing formed in, i.e., when inserted into the gap is formed of both sides of the bushing 11, of course.

또한, 상기 부싱(11)은 웜휠(7)로부터 가해지는 회전 토크가 스티어링 컬럼(9)으로 직접 전달되기 전, 가해지는 회전 토크를 완충·흡수하도록 고무재질로 이루어짐은 물론이다.In addition, the bushing 11 is made of a rubber material so as to buffer and absorb the applied rotation torque before the rotation torque applied from the worm wheel 7 is directly transmitted to the steering column 9.

그리고, 상기 부싱(11)은 상기 제1·2·3·4보스(8a,8b,8c,8d,10a,10b,10c,10d)간 사이에 형성되는 간격으로 위치될 때, 한쪽 측면으로 위치되는 부싱(11)은 다른 쪽 부위에 위치되는 부싱(11)에 비해 압축된 상태로 개재되는데, 이는 조향 토크가 전달되도록 스티어링컬럼(9)이 회전되는 방향의 부싱(11)은 전달 토크에 의해 압축성이 있어야 되는 반면, 그 반대 부위에는 가 해진 회전 토크가 해제될 때 탄성력 저하 발생으로 인한 틈 형성을 방지하기 위함임은 물론이다.When the bushing 11 is positioned at an interval formed between the first, second, third and fourth bosses 8a, 8b, 8c, 8d, 10a, 10b, 10c, and 10d, the bushing 11 is positioned to one side. The bushing 11 is interposed in a compressed state compared to the bushing 11 located in the other part, which is the bushing 11 in the direction in which the steering column 9 is rotated so that the steering torque is transmitted by the transmission torque. While it should be compressible, it is a matter of course to prevent the formation of a gap due to the reduction of elastic force when the rotational torque applied to the opposite side is released.

이하 본 발명의 작용을 첨부된 면을 참조로 상세히 설명한다.Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 일반적인 전동식 스티어링 장치의 작용과 동일하게 차속센서 및 조향토크센서 등에서 감지한 차량의 운행조건에 따라 전자제어장치(ECU)에서 모터를 구동시켜 저속 운행 시에는 가볍고 편안한 조향감을 부여하고, 고속 운행 시에는 무거운 조향감과 더불어 양호한 방향 안정성을 부여하며, 비상상황에서는 급속한 조향이 이루어지도록 하는 기능을 수행하며, 이러한 통상적인 작동에 대한 설명은 생략한다.The present invention drives the motor in the electronic control unit (ECU) according to the driving conditions of the vehicle sensed by the vehicle speed sensor and the steering torque sensor in the same way as a general electric steering device, giving a light and comfortable steering feeling at low speed, It provides a good steering stability with a heavy steering feeling during operation, and performs a function to make a rapid steering in an emergency situation, and description of such a normal operation is omitted.

이에 더해, 본 발명은 모터(2)의 출력 토크가 급격한 증가를 가져올 때, 상기 모터(2)의 토크를 웜축(3)과 웜휠(7)을 통해 전달받는 스티어링컬럼(9)에 가해지는 모터 토크에 의한 충격을 스티어링휠을 잡고 있는 운전자에게 전달되지 않도록 작용을 하게 된다.In addition, the present invention, when the output torque of the motor 2 brings a sharp increase, the motor applied to the steering column 9 receives the torque of the motor 2 through the worm shaft 3 and the worm wheel 7 The shock caused by the torque is not transmitted to the driver holding the steering wheel.

이는, 도 1에 도시된 바와 같이 웜휠(7)과 스티어링 컬럼(9)간을 결합하는 완충결합수단을 이루는 웜휠보스단(8)과 컬럼보스단(10) 및 부싱(11)을 통해 이루어지는데 즉, 모터(2)의 회전 토크가 웜축(3)을 통해 웜휠(7)로 전달되면, 상기 웜휠(7)의 회전력이 서로 결합된 웜휠보스단(8)의 제1·2·3·4보스(8a,8b,8c,8d)와 컬럼보스단(10)도 제1·2·3·4보스(10a,10b,10c,10d)를 통해 스티어링컬럼(9)을 회전시켜 주게 된다.This is done through the worm wheel boss stage 8, the column boss stage 10 and the bushing 11, which constitutes a buffer coupling means for coupling between the worm wheel 7 and the steering column 9, as shown in FIG. That is, when the rotational torque of the motor 2 is transmitted to the worm wheel 7 through the worm shaft 3, the first, second, third, and fourth of the worm wheel boss stage 8 in which the rotational forces of the worm wheel 7 are coupled to each other. The bosses 8a, 8b, 8c, and 8d and the column boss stage 10 also rotate the steering column 9 through the first, second, third and fourth bosses 10a, 10b, 10c, and 10d.

이때, 상기 제1·2·3·4보스(8a,8b,8c,8d,10a,10b,10c,10d)간 사이에 형성되는 간격으로 위치된 고무 재질의 부싱(11)은, 웜휠(7)의 회전 방향으로 쪽에서 압축되면서 웜휠(7)이 스티어링컬럼(9)에 가하는 토크를 완충·흡수하여 스티어링컬럼(9)에 전달되지 않도록 하게 된다.At this time, the rubber bushing 11 positioned at an interval formed between the first, second, third, and fourth bosses 8a, 8b, 8c, 8d, 10a, 10b, 10c, and 10d is a worm wheel 7. Compression from the side in the direction of rotation of the worm wheel 7 to absorb and absorb the torque applied to the steering column (9) so that it is not transmitted to the steering column (9).

즉, 차량을 조타하기 위한 방향으로 스티어링컬럼(9)을 회전시키는 웜휠(7)의 회전 토크는, 상기 웜휠(7)의 웜휠보스단(8)을 이루는 제1·2·3·4보스(8a,8b,8c,8d)가 스티어링컬럼(9)의 컬럼보스단(10)을 이루는 제1·2·3·4보스(10a,10b,10c,10d)에 전달될 때, 상기 웜휠보스단(8)의 제1·2·3·4보스(8a,8b,8c,8d)가 고무 재질의 부싱(11)을 어느 정도 압축하면서 컬럼보스단(10)을 이루는 제1·2·3·4보스(10a,10b,10c,10d)쪽으로 전달되어진다.That is, the rotational torque of the worm wheel 7 for rotating the steering column 9 in the direction for steering the vehicle is the first, second, third, and fourth bosses constituting the worm wheel boss stage 8 of the worm wheel 7. When the 8a, 8b, 8c and 8d are transmitted to the first, second, third and fourth bosses 10a, 10b, 10c and 10d forming the column boss stage 10 of the steering column 9, the worm wheel boss stage The first, second, third, and fourth bosses 8a, 8b, 8c, and 8d of (8) compress the rubber bushing 11 to some extent to form the column boss stage 10. 4 bosses (10a, 10b, 10c, 10d) are delivered to.

이와 같이, 웜휠(7)의 회전토크가 스티어링컬럼(9)으로 전달되기 전에 고무 재질의 부싱(11)을 통해 우선적으로 급격히 증가된 토크가 완충·흡수된 후, 스티어링컬럼(9)으로 전달되어져 스티어링컬럼(9)을 회전시키게 되므로, 스티어링휠을 잡고 있는 운전자에게 전달되지 않도록 작용하게 된다.As such, before the rotational torque of the worm wheel 7 is transmitted to the steering column 9, the rapidly increased torque is first absorbed and absorbed through the rubber bushing 11, and then transmitted to the steering column 9. Since the steering column 9 is rotated, the steering column 9 is not transmitted to the driver holding the steering wheel.

이때, 상기 웜휠(7)의 회전토크가 해제되면 압축되었던 부싱(11)은 자체적인 탄성에 의해 초기 상태로 복원되어짐은 물론이다.At this time, the bushing 11 that was compressed when the rotation torque of the worm wheel 7 is released is of course restored to its initial state by its elasticity.

한편, 조향 시 출력 토크를 전달하는 회전 방향의 반대쪽 부위로 위치된 부싱(11)은 미리 압축된 상태로 개재됨에 따라, 웜휠(7)로부터 회전 토크가 가해질 때나 해제될 때에도 탄성 변화가 거의 일어나지 않게 됨은 물론이다.On the other hand, the bushing 11 positioned to the opposite side of the rotational direction to transmit the output torque during steering is interposed in a pre-compressed state, so that the elastic change hardly occurs even when the rotational torque is applied or released from the worm wheel 7. Of course.

이상 설명한 바와 같이 본 발명에 의하면, 모터의 출력 토크를 웜휠로부터 전달받는 스티어링컬럼에 탄성력을 갖는 고무 재질의 부싱을 개재시켜, 모터로부터 순간적으로 과도한 토크가 발생되더라도 이를 완충·흡수하면서 스티어링컬럼을 회전시켜 줌에 따라 운전자가 느끼는 조향 에포트(effort)의 급격한 변화를 막음은 물론 조향 안정성도 동시에 향상시켜주는 효과가 있게 된다.As described above, according to the present invention, the steering column receives the output torque of the motor through a rubber bushing having elastic force, and rotates the steering column while absorbing and absorbing even if excessive torque is generated momentarily from the motor. As a result, it is possible to prevent a sudden change in the steering effort felt by the driver and to improve steering stability at the same time.

Claims (6)

운전자의 조타력을 모터(2)의 회전 출력 토크를 웜축(3)과이에 치합 된 웜휠(7) 및 웜휠(7)에 결합된 스티어링 컬럼(9)을 통해 기어박스를 쪽으로 전달하는 전동 스티어링 장치에 있어서, Electric steering device which transmits the driver's steering force to the gearbox via the worm shaft 3 and the worm wheel 7 engaged with the worm shaft 3 and the steering column 9 coupled to the worm wheel 7 To 상기 웜축(3)과 웜휠(7)을 통해 전달되는 모터(2)의 급격한 출력 토크를 흡수해 완충하도록, 상기 웜휠(7)과 스티어링 컬럼(9)이 탄성력을 갖는 고무재질로 이루어진 완충결합수단으로 결합되어진 것을 특징으로 하는 차량용 전동 스티어링장치의 스티어링컬럼 결합구조.Shock absorbing means for the worm wheel (7) and the steering column (9) made of a rubber material having an elastic force to absorb and absorb the sudden output torque of the motor (2) transmitted through the worm shaft (3) and the worm wheel (7) Steering column coupling structure of the vehicle electric steering apparatus, characterized in that coupled to. 청구항 1에 있어서, 상기 완충결합수단은 웜휠(7)에 형성된 중공의 결합홀(7a)에서 돌출 된 웜휠보스단(8)과, 상기 웜휠보스단(8)에 결합되는 스티어링컬럼(9)에 돌출 된 컬럼보스단(10) 및 상기 보스단(8,10)사이에 위치되어져 가해지는 회전 토크를 완충·흡수하는 부싱(11)으로 구성되어진 것을 특징으로 하는 차량용 전동 스티어링장치의 스티어링컬럼 결합구조.The method according to claim 1, wherein the buffer coupling means is a worm wheel boss end (8) protruding from the hollow coupling hole (7a) formed in the worm wheel (7), and the steering column (9) coupled to the worm wheel boss end (8) Steering column coupling structure of the electric power steering apparatus for a vehicle, comprising a bushing 11 for cushioning and absorbing rotational torque applied between the protruding column boss stage 10 and the boss stages 8 and 10. . 청구항 2에 있어서, 상기 웜휠보스단(8)은 결합홀(7a)내에서 서로 대칭을 이루도록 90°간격을 갖는 제1·2·3·4보스(8a,8b,8c,8d)로 이루어지며, 상기 컬럼 보스단(10)도 스티어링컬럼(9)의 외주면에서 서로 대칭을 이루도록 90°간격을 갖는 제1·2·3·4보스(10a,10b,10c,10d)로 이루어진 것을 특징으로 하는 차량용 전동 스티어링장치의 스티어링컬럼 결합구조. The worm wheel boss stage (8) is made up of the first, second, third, and fourth bosses (8a, 8b, 8c, 8d) having a 90 ° interval so as to be symmetrical with each other in the coupling hole (7a). The column boss stage 10 is also made of first, second, third and fourth bosses (10a, 10b, 10c, 10d) having a 90 ° interval to be symmetrical with each other on the outer circumferential surface of the steering column (9). Steering column coupling structure of vehicle electric steering system. 청구항 3에 있어서, 상기 컬럼보스단(10)의 제1·2·3·4보스(10a,10b,10c,10d)는 웜휠보스단(8)의 제1·2·3·4보스(8a,8b,8c,8d)간 사이에 형성되는 간격에 비해 상대적으로 작게 형성된 것을 특징으로 하는 차량용 전동 스티어링장치의 스티어링컬럼 결합구조. The first, second, third, and fourth bosses 10a, 10b, 10c, and 10d of the column boss stage 10 are formed of the first, second, third, and fourth bosses 8a of the worm wheel boss stage. Steering column coupling structure of the electric power steering apparatus for a vehicle, characterized in that formed relatively small compared to the gap formed between, 8b, 8c, 8d). 청구항 4에 있어서, 상기 제1·2·3·4보스(8a,8b,8c,8d,10a,10b,10c,10d)사이의 양 간격으로 부싱(11)이 위치되는 것을 특징으로 하는 차량용 전동 스티어링장치의 스티어링컬럼 결합구조. 5. The vehicle transmission according to claim 4, wherein the bushings 11 are positioned at both intervals between the first, second, third, and fourth bosses 8a, 8b, 8c, 8d, 10a, 10b, 10c, and 10d. Steering column coupling structure of the steering system. 청구항 2에 있어서, 상기 부싱(11)은 스티어링컬럼(9)이 회전되는 방향으로 위치되는 부싱(11)은 전달 토크에 의한 탄성 압축이 일어나는 반면, 그 반대 부위로 위치되는 부싱(11)은 미리 압축된 상태인 것을 특징으로 하는 차량용 전동 스티어링장치의 스티어링컬럼 결합구조.The method according to claim 2, wherein the bushing 11 is a bushing 11 in the direction in which the steering column 9 is rotated, the elastic compression by the transmission torque occurs, while the bushing 11 located in the opposite portion is previously Steering column coupling structure of the vehicle electric steering apparatus, characterized in that the compressed state.
KR1020060067273A 2006-07-19 2006-07-19 Worm wheel and steering column fixing structure for motor driven power steering system in vehicle KR20080007975A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160025066A (en) * 2014-08-25 2016-03-08 남양공업주식회사 Structure of worm gear for electric power steering system
KR20170079893A (en) * 2015-12-31 2017-07-10 남양공업주식회사 Electrical Steering Apparatus and Method to manufacture the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160025066A (en) * 2014-08-25 2016-03-08 남양공업주식회사 Structure of worm gear for electric power steering system
KR20170079893A (en) * 2015-12-31 2017-07-10 남양공업주식회사 Electrical Steering Apparatus and Method to manufacture the same

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