Patent ID: 6733039
Filing Date: 2004-05-11
Classification: B62D,F16F

Abstract:
A damper mechanism for a steering device, comprising:an outer pipe having inward convex portions and concave grooves extending along an axial direction on an inner periphery side and alternately formed at a plurality of positions in a circumferential direction; an inner member inserted into the outer pipe and having outward convex portions extending along the axial direction on an outer periphery side and fitted in concave grooves between the inward convex portions formed at a plurality of positions in the circumferential direction; and an elastic body provided between the inward convex portions of the outer pipe and the outward convex portions of the inner member, the elastic body including a thick wall portion provided between one side face of at least one of the outward convex portions of the inner member and a first inward convex portion of the outer pipe, and a thin wall portion provided between the outer side face of at least one of the outward convex portions and a second inward convex portion of the outer pipe, wherein the elastic body is configured such that a spring constant increases with an increase in a relative twist angle between the outer pipe and the inner member.