Patent ID: 9434253
Filing Date: 2016-09-06
CPC Classification: B60K,B60T,F16F,G05G,Y10T

Claim Text:
1. A damper for damping rotation of a rotating shaft, comprising: a pair of cam members each having an inclined cam face inclined with respect to a rotation direction of the rotating shaft, upon a torque of the rotating shaft being transmitted to the cam members, the cam members rotating relative to each other about an axis of the rotating shaft and moving relative to each other in an axial direction of the rotating shaft with the inclined cam faces in sliding contact with each other; a housing part housing the pair of cam members and having an inner side surface, the pair of cam members moving and rotating relative to each other slide on the inner side surface; an elastic body placed within the housing part so as to be compressed in the axial direction of the rotating shaft by an increase of an amount of the relative movement of the pair of cam members in the axial direction, and biasing the pair of cam members in the axial direction of the rotating shaft; and at least two inclined areas formed in the inclined cam face of at least one of the pair of cam members, inclined at different angles from each other with respect to the direction of the relative rotation of the pair of cam members, and arranged in the direction of the relative rotation of the pair of cam members, wherein: the elastic body presses the pair of cam members in the axial direction of the rotating shaft against an end portion of the housing part in the axial direction of the rotating shaft so as to allow the pair of cam members to press against each other at the inclined cam faces and then to rotate relatively each other while changing the inclined areas; and the inclined areas have different increase rates of pushing depth of the elastic body in the axial direction of the rotating shaft according to the relative rotation of the pair of cam members, whereby, an increase rate of a friction resistance impeding relative rotation of the pair of cam members according to an increase of a relative rotation angle of the pair of cam members is changed stepwise by changing force of pressing the pair of cam members against the end portion of the housing part in a stepwise manner.