Disclosed is a crank assembly with a built-in transmission providing excellent durability. According to an embodiment of the present invention, the crank assembly with a built-in transmission includes: a ring gear having a direct connection ratchet coupled to an outer circumferential surface thereof and gear teeth formed on an inner circumferential surface; a clutch having an elastic ratchet formed on an outer circumferential surface thereof and a magnetic rod mounted, and rotated to determine whether to deploy the direct connection ratchet according to a position of the magnetic rod; a crank cover having clutch ratchet teeth engaged with the elastic ratchet of the clutch and direct connection ratchet teeth engaged with the deployed direct connection ratchet, and including a coupling shaft formed therein, wherein the clutch ratchet teeth and the direct connection ratchet teeth are formed on an inner circumferential surface of the crank cover; a sun gear unit mounted on the coupling shaft; a reduction gear unit including an eccentric guide in which an eccentric hole is formed, and an eccentric gear which is coupled to the eccentric guide, and of which one region is engaged with the ring gear and the other region is engaged with the sun gear unit; and a chainring housing rotating together with the ring gear and having a chainring coupling portion formed on an outer circumferential surface thereof.
변속기 내장형 크랭크 조립체가 개시된다. 본 발명의 일 실시예에 따른 변속기 내장형 크랭크 조립체는, 외주면에 직결라쳇이 결합되며, 내주면에 기어 이가 형성되는 링기어; 외주면에 탄성라쳇이 형성되며, 자력봉이 장착되고, 회전되어 상기 자력봉의 위치에 따라 상기 직결라쳇의 전개여부를 결정하는 클러치; 상기 클러치의 탄성라쳇과 치합되는 클러치라쳇 톱니와, 전개된 상기 직결라쳇과 치합되는 직결라쳇 톱니가 내주면에 형성되고, 결합축이 형성되는 크랭크 커버; 상기 결합축에 장착되는 선기어부; 편심홀이 형성되는 편심 가이드 및 상기 편심 가이드에 결합되며 어느 일 영역은 상기 링기어와 치합되며 다른 일 영역은 상기 선기어부와 치합되는 편심기어를 포함하는 감속기어부; 및 상기 링기어와 함께 회전되며, 외주면에는 체인링 결합부가 형성되는 체인링 하우징;을 포함한다.
CRANK ASSEMBLY WITH TRANSMISSION
변속기 내장형 크랭크 조립체
2020-06-02
Patent
Electronic Resource
Korean
PEDAL CRANK, PEDAL CRANK ASSEMBLY AND A BICYCLE HAVING A PEDAL CRANK ASSEMBLY
European Patent Office | 2022
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