Patent ID: 9618061
Date: 2017-04-11
CPC Classifications: F16D

Claim:
1. A clutch mechanism comprising: a housing chamber having a cylindrical space; an output rotator coaxially housed in the housing chamber; an input rotator coaxially provided with the output rotator; an engagement piece provided between an inner circumferential surface of the housing chamber and an outer circumferential surface of the output rotator; and a biasing member configured to bias the engagement piece toward one side of a circumferential direction, wherein the output rotator has on the outer circumferential surface thereof a cam surface configured to gradually reduce the space from the inner circumferential surface of the housing chamber toward the one side and a recess adjacent to the one side of the cam surface, the input rotator has a pressure transmission portion fitted with circumferential play to the recess and is protruded from the inside of the recess in a centrifugal direction, the engagement piece is disposed in contact with the cam surface and the inner circumferential surface of the housing chamber, when the input rotator rotates toward the other side relative to the one side, the pressure transmission portion abuts against the engagement piece and then abuts against a circumferential end surface in the recess to press and move the output rotator, the pressure transmission portion has a flat abutment surface radially extending from the inside to outside of the recess and configured to abut against both the circumferential end surface in the recess and the engagement piece, and the biasing member includes a fixing portion inserted in a lock position formed in the output rotator and a pressing portion extended from the fixing portion and bent at an outside of the output rotator in a radial direction of the output shaft toward the one side of the circumferential direction and a radially outward direction to press the engagement piece.