KR20110064013A - Worm shaft support damper for motor driven power steering - Google Patents

Worm shaft support damper for motor driven power steering Download PDF

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Publication number
KR20110064013A
KR20110064013A KR1020090120427A KR20090120427A KR20110064013A KR 20110064013 A KR20110064013 A KR 20110064013A KR 1020090120427 A KR1020090120427 A KR 1020090120427A KR 20090120427 A KR20090120427 A KR 20090120427A KR 20110064013 A KR20110064013 A KR 20110064013A
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South Korea
Prior art keywords
leaf spring
worm shaft
case ring
power steering
worm
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KR1020090120427A
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Korean (ko)
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KR101591098B1 (en
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박상준
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현대모비스 주식회사
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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
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0454—Worm gears
    • 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
    • B60Y2300/20—Reducing vibrations in the driveline
    • B60Y2300/207—Reducing vibrations in the driveline related to drive shaft torsion, e.g. driveline oscillations
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Gear Transmission (AREA)

Abstract

PURPOSE: A worm-shaft supporting damper for a motor-driven power steering device is provided to make power transfer smooth by pressing a worm shaft to be suitable for a worm wheel and prevent rattle noise due to the vertical vibration of the worm shaft by limiting and damping the vertical vibration of the worm shaft in multi stages. CONSTITUTION: A worm-shaft supporting damper for a motor-driven power steering device comprises a case ring(5), a leaf spring and an elastic member(9). The case ring surrounds the outer part of a bearing and opens a part of entire circumferential surface. The bearing supports the end of a worm shaft. The leaf spring connects both opened ends of the case ring. The elastic member protects the case ring and the leaf spring. The leaf spring makes contact with both ends of the case ring at the outer part of the case ring. The elastic member has a shape of a ring, which protects the case ring and the leaf spring. The part protecting the leaf spring is protruded to the outer part of a radial direction to form a damping unit(11).

Description

전동식 파워스티어링 장치의 웜샤프트 지지댐퍼{Worm Shaft Support Damper for Motor Driven Power Steering}Worm Shaft Support Damper for Motor Driven Power Steering

본 발명은 전동식 파워스티어링 장치에 관한 것으로서, 보다 상세하게는 운전자의 조타력을 보조하기 위하여 모터에서 제공되는 동력을 웜샤프트와 웜휠을 통해 전달하도록 된 전동식 파워스티어링 장치에서, 상기 웜샤프트를 지지하는 댐퍼에 관한 기술이다.The present invention relates to an electric power steering apparatus, and more particularly, to an electric power steering apparatus configured to transmit power provided from a motor through a worm shaft and a worm wheel to assist a driver's steering force. A technology about dampers.

도 1은 종래의 전동식 파워스티어링의 구조를 도시한 것으로서, 스티어링샤프트에 연결되는 웜휠(500)과, 상기 웜휠(500)에 치합되어 모터에 의한 구동력을 상기 웜휠(500)로 제공하는 웜샤프트(502)가 구비되어 있으며, 상기 웜샤프트(502)와 웜휠(500)의 안정된 치합상태를 확보하도록 하기 위한 타원링(504)과 스프링(506)이 구비되어 있다.1 illustrates a structure of a conventional electric power steering, a worm shaft 500 connected to a steering shaft and a worm shaft engaged with the worm wheel 500 to provide driving power by a motor to the worm wheel 500 ( 502 is provided, and an elliptic ring 504 and a spring 506 are provided to secure a stable engagement state of the worm shaft 502 and the worm wheel 500.

즉, 상기 웜샤프트(502)의 단부에는 베어링(508)이 결합되고, 상기 베어링(508)은 타원링(504)에 의해 감싸진 상태로 지지되며, 상기 스프링(506)의 탄성력을 슬라이더(510)가 상기 타원링(504)을 관통하여 상기 베어링(508)에 제공함으로써, 상기 웜샤프트(502)가 상기 웜휠(500)에 탄성적으로 밀착되어, 틈새 발생에 따른 래틀 소음 등을 방지하도록 된 구성이다.That is, the bearing 508 is coupled to the end of the worm shaft 502, the bearing 508 is supported in a state surrounded by an elliptic ring 504, the slider 510 to the elastic force of the spring 506 By passing through the elliptic ring 504 to the bearing 508, the worm shaft 502 is elastically in close contact with the worm wheel 500, to prevent rattle noise due to gaps, etc. Configuration.

그런데, 상기한 바와 같은 구조에서는 상기 스프링(506)의 탄성력만으로 상기 웜휠(500)을 눌러주게 되어 있어서, 스프링(506)의 하중이 너무 약하면 래틀 노이즈가 심해지고, 너무 강하면 웜샤프트(502)와 웜휠(500)의 마찰력 증가로 스티어링휠의 조향감이 무거워지게 되는데, 이러한 특성은 상기 스프링(506)의 탄성력에 의해서만 튜닝되기 때문에 정확하고 적절한 조정이 쉽지 않고, 대량 조립시에는 각 제품마다 웜샤프트(502)의 흔들림에 대한 지지상태의 산포가 크게 되는 문제점이 있다. However, in the structure as described above, the worm wheel 500 is pressed by only the elastic force of the spring 506. If the load of the spring 506 is too weak, the rattle noise is severe, and if it is too strong, the worm shaft 502 and The steering wheel of the steering wheel becomes heavy due to the increased frictional force of the worm wheel 500. Since this characteristic is tuned only by the elastic force of the spring 506, accurate and proper adjustment is not easy. There is a problem that the dispersion of the support state to the shaking of 502 becomes large.

본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 안출된 것으로서, 별도의 조정작업이 요구되지 않으면서도, 웜샤프트를 웜휠에 적합한 상태로 눌러주어, 웜샤프트로부터 웜휠로의 동력전달이 항상 원활하게 이루어질 수 있도록 보장함과 아울러, 웜휠로부터 역으로 입력되는 하중에 의해서 웜샤프트가 상하로 진동하게 되는 것을 다단으로 억제 및 댐핑하여 웜샤프트의 상하방향 흔들림에 의한 래틀 소음의 발생을 효과적으로 방지할 수 있도록 한 전동식 파워스티어링 장치의 웜샤프트 지지댐퍼를 제공함에 그 목적이 있다.The present invention has been made to solve the problems described above, by pressing the worm shaft in a state suitable for the worm wheel without requiring any additional adjustment work, the power transmission from the worm shaft to the worm wheel is always smooth. In addition to ensuring that the worm shaft vibrates up and down by the load input from the worm wheel in reverse, it is possible to effectively prevent the occurrence of rattle noise caused by the up and down movement of the worm shaft. It is an object of the present invention to provide a worm shaft support damper of an electric power steering device.

상기한 바와 같은 목적을 달성하기 위한 본 발명 전동식 파워스티어링 장치의 웜샤프트 지지댐퍼는Worm shaft support damper of the present invention the electric power steering device for achieving the object as described above

웜샤프트의 단부를 지지하는 베어링의 외측을 감싸고 전체 원주면 중 일부가 개방된 형상의 케이스링과;A case ring of a shape surrounding the outer side of the bearing supporting the end of the worm shaft and having a portion of the entire circumferential surface opened;

상기 케이스링의 개방된 양단을 연결하는 판스프링과;Leaf springs connecting both open ends of the case ring;

상기 케이스링과 판스프링 전체를 감싸는 탄성부재;An elastic member surrounding the case ring and the entire leaf spring;

를 포함하여 구성된 것을 특징으로 한다.Characterized in that configured to include.

본 발명은 별도의 조정작업이 요구되지 않으면서도, 웜샤프트를 웜휠에 적합한 상태로 눌러주어, 웜샤프트로부터 웜휠로의 동력전달이 항상 원활하게 이루어질 수 있도록 보장함과 아울러, 웜휠로부터 역으로 입력되는 하중에 의해서 웜샤프트가 상하로 진동하게 되는 것을 다단으로 억제 및 댐핑하여 웜샤프트의 상하방향 흔들림에 의한 래틀 소음의 발생을 효과적으로 방지할 수 있도록 한다.The present invention presses the worm shaft in a state suitable for the worm wheel without requiring any additional adjustment work, and ensures that power transmission from the worm shaft to the worm wheel is always performed smoothly, and is reversed from the worm wheel. By suppressing and damping the worm shaft vibrating up and down by the load in multiple stages, it is possible to effectively prevent the generation of rattle noise due to the vertical movement of the worm shaft.

도 2 내지 도 4를 참조하면, 본 발명 실시예는 웜샤프트(1)의 단부를 지지하는 베어링(3)의 외측을 감싸고 전체 원주면 중 일부가 개방된 형상의 케이스링(5)과; 상기 케이스링(5)의 개방된 양단을 연결하는 판스프링(7)과; 상기 케이스링(5)과 판스프링(7) 전체를 감싸는 탄성부재(9)를 포함하여 구성된다.2 to 4, an embodiment of the present invention includes a case ring 5 surrounding the outer side of the bearing 3 supporting the end of the worm shaft 1 and having a part of the entire circumferential surface open; Leaf springs (7) for connecting the open both ends of the case ring (5); It comprises an elastic member (9) surrounding the case ring (5) and the leaf spring (7).

상기 케이스링(5)은 플라스틱 사출물로 구성하는 것이 바람직하다.The case ring 5 is preferably composed of a plastic injection molding.

상기 판스프링(7)은 상기 케이스링(5)의 외측에서 상기 케이스링(5)의 양단에 접촉하도록 형성되고, 상기 탄성부재(9)는 상기 케이스링(5)과 판스프링(7)을 감싸는 원형링 형상으로 형성되되, 상기 판스프링(7)을 감싸는 부위는 반경방향 외측으로 돌출되어 댐핑부(11)를 형성하는 구조이다.The leaf spring 7 is formed to contact both ends of the case ring 5 from the outside of the case ring 5, the elastic member 9 is the case ring 5 and the leaf spring (7) It is formed in a circular ring shape to wrap, the portion surrounding the leaf spring (7) is a structure to protrude radially outward to form a damping portion (11).

상기 댐핑부(11)가 돌출된 방향은 상측방향으로서, 웜샤프트(1)를 기준으로 웜휠(13)의 반대편에 해당하는 방향이다. 즉, 상기 웜샤프트(1)가 웜휠(13)로부터 멀어지는 방향으로 이동하는 것을 규제할 수 있는 방향이다.The direction in which the damping part 11 protrudes is an upward direction and corresponds to an opposite side of the worm wheel 13 with respect to the worm shaft 1. That is, the worm shaft 1 is a direction that can restrict the movement in the direction away from the worm wheel (13).

상기 댐핑부(11)는 내측으로 상기 판스프링(7)을 향하여 돌출된 댐핑돌기(15)를 구비하고, 상기 댐핑돌기(15)의 단부는 상기 판스프링(7)과 이격되어 완충갭을 형성하며, 상기 판스프링(7)의 내측면은 상기 베어링(3)에 접촉한 상태로 결합된다.The damping part 11 has a damping protrusion 15 protruding toward the leaf spring 7 inwardly, and an end portion of the damping protrusion 15 is spaced apart from the leaf spring 7 to form a buffer gap. And, the inner surface of the leaf spring 7 is coupled in contact with the bearing (3).

본 실시예에서, 상기 판스프링(7)은 상기 케이스링(5)의 측면과 상기 탄성부재(9)의 측면을 감싸도록 절곡된 가이드절곡부(17)를 구비하고, 상기 탄성부재(9)는 우레탄으로 이루어져 있다.In this embodiment, the leaf spring 7 has a guide bent portion 17 bent to surround the side of the case ring 5 and the side of the elastic member 9, the elastic member 9 Consists of urethane.

상기한 바와 같이 이루어진 웜샤프트 지지댐퍼(21)는 도 2에 도시된 바와 같이 웜샤프트(1)의 일단에 설치된 베어링(3)을 지지함으로써, 웜샤프트(1)를 하우징(19)에 대하여 지지하는 역할을 한다.The worm shaft support damper 21 configured as described above supports the worm shaft 1 with respect to the housing 19 by supporting the bearing 3 installed at one end of the worm shaft 1 as shown in FIG. 2. It plays a role.

상기 판스프링(7)과 상기 케이스링(5)에 의해 감싸진 베어링(3)은 평상시에 상기 판스프링(7)에 의해서 제공되는 탄성력을 받아 상기 웜샤프트(1)가 웜휠(13)에 적절한 압력으로 치합되도록 한다.The bearing 3 enclosed by the leaf spring 7 and the case ring 5 is usually subjected to an elastic force provided by the leaf spring 7 so that the worm shaft 1 is suitable for the worm wheel 13. Make sure to engage with pressure.

즉, 도 5에 도시된 바와 같이, 상기 판스프링(7)과 상기 댐핑돌기(15) 사이의 완충갭 범위 내에서는 상기 판스프링(7)이 변형되면서 제공하는 탄성력이 상기 웜샤프트(1)와 웜휠(13)이 치합된 상태를 탄성적으로 지지하여, 상기 웜휠(13)에 대한 웜샤프트(1)의 상대 변위를 흡수하여 웜샤프트(1)의 이탈을 방지하며 및 진동발생을 억제하도록 하면서, 모터에서 제공되는 회전력이 웜샤프트(1)로부터 웜휠(13)로 원활하게 전달되도록 한다.That is, as shown in FIG. 5, within the buffer gap range between the leaf spring 7 and the damping protrusion 15, the elastic force provided while the leaf spring 7 is deformed is the worm shaft 1. The worm wheel 13 elastically supports the engaged state, so as to absorb the relative displacement of the worm shaft 1 with respect to the worm wheel 13 to prevent the worm shaft 1 from falling off and to suppress the occurrence of vibration The rotational force provided by the motor is smoothly transmitted from the worm shaft 1 to the worm wheel 13.

한편, 웜휠(13) 쪽으로 입력되는 역하중에 대해서는, 1차적으로는 도 5의 완충갭 범위 내에서 상기 판스프링(7)이 완충력을 제공하고, 이후에는 상기 우레탄으로 이루어진 댐핑돌기(15)가 도 6에 도시된 바와 같이 변형되면서 완충하게 된다.On the other hand, with respect to the reverse load input toward the worm wheel 13, the leaf spring 7 provides a buffering force within the buffer gap range of Figure 5, and then the damping protrusion 15 made of the urethane As shown in FIG. 6, the buffer is deformed while being deformed.

즉, 상기 판스프링(7)이 변형되어 상기 댐핑돌기(15)에 닿으면서부터는 상기 댐핑돌기(15)에 의한 완충작용이 시작되는 것이다.That is, the damping protrusion 15 is started by the damping protrusion 15 when the leaf spring 7 is deformed to contact the damping protrusion 15.

물론, 상기 댐핑돌기(15)를 이루는 상기 탄성부재(9)는 우레탄 이외에 고무 등과 같은 다른 소재로 구성될 수도 있을 것이다.Of course, the elastic member 9 constituting the damping protrusion 15 may be made of other materials such as rubber in addition to urethane.

도 1은 종래 기술에 의한 전동식 파워스티어링 장치의 구조를 설명한 도면,1 is a view for explaining the structure of the electric power steering apparatus according to the prior art,

도 2는 본 발명에 따른 전동식 파워스티어링 장치의 웜샤프트 지지댐퍼가 설치된 구조를 설명한 도면,2 is a view illustrating a structure in which a worm shaft support damper is installed in an electric power steering apparatus according to the present invention;

도 3은 도 2의 지지댐퍼 설치상태를 좌측에서 관측한 도면,3 is a view of the support damper installation state of FIG.

도 4는 본 발명에 따른 지지댐퍼의 분해 사시도,4 is an exploded perspective view of a support damper according to the present invention;

도 5와 도 6은 본 발명에 따른 지지댐퍼의 2단계에 걸친 완충작용을 차례로 설명한 도면이다.5 and 6 are views sequentially explaining the buffering action of two stages of the support damper according to the present invention.

<도면의 주요 부분에 대한 부호의 간단한 설명><Brief description of symbols for the main parts of the drawings>

1; 웜샤프트 3; 베어링One; Worm shaft 3; bearing

5; 케이스링 7; 판스프링5; Casering 7; Leaf spring

9; 탄성부재 11; 댐핑부9; Elastic member 11; Damping part

13; 웜휠 15; 댐핑돌기13; Worm wheel 15; Damping protrusion

17; 가이드절곡부 19; 하우징17; Guide bend 19; housing

Claims (4)

웜샤프트의 단부를 지지하는 베어링의 외측을 감싸고 전체 원주면 중 일부가 개방된 형상의 케이스링과;A case ring of a shape surrounding the outer side of the bearing supporting the end of the worm shaft and having a portion of the entire circumferential surface opened; 상기 케이스링의 개방된 양단을 연결하는 판스프링과;Leaf springs connecting both open ends of the case ring; 상기 케이스링과 판스프링 전체를 감싸는 탄성부재;An elastic member surrounding the case ring and the entire leaf spring; 를 포함하여 구성된 것을 특징으로 하는 전동식 파워스티어링 장치의 웜샤프트 지지댐퍼.Worm shaft support damper of the electric power steering device, characterized in that configured to include. 청구항 1에 있어서,The method according to claim 1, 상기 판스프링은 상기 케이스링의 외측에서 상기 케이스링의 양단에 접촉하도록 형성되고;The leaf spring is formed to contact both ends of the case ring at an outer side of the case ring; 상기 탄성부재는 상기 케이스링과 판스프링을 감싸는 원형링 형상으로 형성되되, 상기 판스프링을 감싸는 부위는 반경방향 외측으로 돌출되어 댐핑부를 형성하는 것The elastic member is formed in a circular ring shape surrounding the case ring and the leaf spring, the portion surrounding the leaf spring protrudes radially outward to form a damping portion 을 특징으로 하는 전동식 파워스티어링 장치의 웜샤프트 지지댐퍼.Worm shaft support damper of the electric power steering device. 청구항 2에 있어서,The method according to claim 2, 상기 댐핑부는 내측으로 상기 판스프링을 향하여 돌출된 댐핑돌기를 구비하고;The damping part includes a damping protrusion protruding inward toward the leaf spring; 상기 댐핑돌기의 단부는 상기 판스프링과 이격되어 완충갭을 형성하며;An end portion of the damping protrusion is spaced apart from the leaf spring to form a buffer gap; 상기 판스프링의 내측면은 상기 베어링에 접촉한 상태로 결합되는 것The inner surface of the leaf spring is coupled in contact with the bearing 을 특징으로 하는 전동식 파워스티어링 장치의 웜샤프트 지지댐퍼.Worm shaft support damper of the electric power steering device. 청구항 3에 있어서,The method of claim 3, 상기 판스프링은 상기 케이스링의 측면과 상기 탄성부재의 측면을 감싸도록 절곡된 가이드절곡부를 구비하고;The leaf spring has a guide bent portion bent to surround the side of the case ring and the side of the elastic member; 상기 탄성부재는 우레탄으로 이루어진 것The elastic member is made of urethane 을 특징으로 하는 전동식 파워스티어링 장치의 웜샤프트 지지댐퍼.Worm shaft support damper of the electric power steering device.
KR1020090120427A 2009-12-07 2009-12-07 Worm Shaft Support Damper for Motor Driven Power Steering KR101591098B1 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101423949B1 (en) * 2013-09-02 2014-08-01 한국델파이주식회사 Electric power steering apparatus
KR101442765B1 (en) * 2013-09-02 2014-09-25 한국델파이주식회사 Electric power steering apparatus
CN104326014A (en) * 2013-07-22 2015-02-04 北汽福田汽车股份有限公司 Steering gear and vehicle with same
KR20160036289A (en) * 2014-09-25 2016-04-04 현대모비스 주식회사 Bearing bush
KR20160087003A (en) * 2015-01-12 2016-07-21 주식회사 만도 Reducer for vehicle
KR101650743B1 (en) * 2015-03-30 2016-08-25 주식회사 디엠씨 Electric steering damping bush
KR20170001983A (en) * 2015-06-29 2017-01-06 현대자동차주식회사 Clearance compensation device of motor driven power steering apparatus
KR20170080899A (en) * 2015-12-31 2017-07-11 남양공업주식회사 Structure of bearing holder for electric power steering system
WO2019081596A1 (en) * 2017-10-27 2019-05-02 Volkswagen Aktiengesellschaft Prestressing device

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Publication number Priority date Publication date Assignee Title
JP2005088821A (en) * 2003-09-19 2005-04-07 Hitachi Unisia Automotive Ltd Electric power steering device
JP2006044449A (en) * 2004-08-04 2006-02-16 Favess Co Ltd Electric power steering device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104326014A (en) * 2013-07-22 2015-02-04 北汽福田汽车股份有限公司 Steering gear and vehicle with same
CN104326014B (en) * 2013-07-22 2016-09-07 北汽福田汽车股份有限公司 Steering gear and there is the vehicle of this steering gear
KR101423949B1 (en) * 2013-09-02 2014-08-01 한국델파이주식회사 Electric power steering apparatus
KR101442765B1 (en) * 2013-09-02 2014-09-25 한국델파이주식회사 Electric power steering apparatus
KR20160036289A (en) * 2014-09-25 2016-04-04 현대모비스 주식회사 Bearing bush
KR20160087003A (en) * 2015-01-12 2016-07-21 주식회사 만도 Reducer for vehicle
KR101650743B1 (en) * 2015-03-30 2016-08-25 주식회사 디엠씨 Electric steering damping bush
KR20170001983A (en) * 2015-06-29 2017-01-06 현대자동차주식회사 Clearance compensation device of motor driven power steering apparatus
KR20170080899A (en) * 2015-12-31 2017-07-11 남양공업주식회사 Structure of bearing holder for electric power steering system
WO2019081596A1 (en) * 2017-10-27 2019-05-02 Volkswagen Aktiengesellschaft Prestressing device

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