The present invention relates to a structure of a worm wheel of an electric power steering system, provided with an improved and simple buffering structure easily assembled and applying a buffering force to a load transferred from a steering shaft and a worm shaft. According to the present invention, the structure of the worm wheel of the electric power steering system comprises: a worm wheel main body; a worm wheel hub; a hub cover; a coupling means; a first protrusion part; a second protrusion part; and a damper. The worm wheel main body has a through hole formed on the center thereof and has a plurality of coupling holes formed on the outer edge of the through hole to be spaced from each other. The worm hub is coupled to the left side of the worm wheel′s main body to be in surface contact therewith and has a fitting hole formed at the center to allow the steering shaft to be axially and fittingly coupled thereto. The hub cover is coupled to the right side of the worm wheel′s main body to be in surface contact therewith. The coupling means couples the worm wheel and the hub cover to be in close contact with both the left and right sides of the worm wheel′s main body. The first protrusion part and the second protrusion part protrude from surfaces that are opposite each other in the worm wheel hub and the hub cover to fittingly be coupled to the coupling hole of the worm wheel′s main body. The damper is coupled to cover each outer periphery of the first protrusion and the second protrusion and is elastically deformed by an external load.

    본 발명은 웜휠에 단순 구조의 래틀 완충구조를 제공함과 아울러, 조립이 간편하고 조향축 및 웜축으로부터 전달되는 하중에 대해 완충력을 부여할 수 있도록 그 구조가 개선된 전동식 파워 스티어링장치의 웜휠 구조체에 관한 것이다. 본 발명에 따른 전동식 파워 스티어링장치의 웜휠 구조체는, 중앙에 통공이 형성되고 통공의 외측 가장자리 부위에 서로 이격되게 복수의 결합공이 형성되는 웜휠 본체와, 웜휠 본체의 좌측에 면접촉되도록 결합되고 중앙에 조향축이 축 결합되도록 끼워지는 끼움공이 형성된 웜휠 허브와, 상기 웜휠 본체의 우측에 면접촉되도록 결합되는 허브 커버와, 상기 웜휠 허브와 허브 커버를 웜휠 본체의 좌,우 양측에 밀착되도록 결합시키는 결합수단과, 상기 웜휠 허브와 상기 허브 커버의 서로 마주보는 면에 돌출되도록 형성되어 상기 웜휠 본체의 결합공에 끼움 결합되는 제1,2돌출부와, 상기 결합공에 끼워지는 상기 제1,2돌출부의 외측 둘레를 각각 감싸도록 결합되고 외부 하중에 의해 탄성 변형되는 댐퍼로 구성된다.


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    Title :

    STRUCTURE OF WORM GEAR FOR ELECTRIC POWER STEERING SYSTEM


    Additional title:

    전동식 파워 스티어링장치의 웜휠 구조체


    Contributors:

    Publication date :

    2016-03-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge / F16H Getriebe , GEARING



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