Patent ID: 8123018
Filing Date: 2012-02-28
Classification: B60K,F16C,F16D

Abstract:
1. A power transmitting device comprising: a first rotor having a cylindrical shape; a second rotor having a shaft-like shape, the second rotor being provided inside the first rotor to be rotatable relative to and coaxial with the first rotor; a clutch mechanism that selectively permits and shuts off transmission of torque between the first rotor and the second rotor, the power transmitting device being rotatably supported by a bearing arranged outside the first rotor; and a relaxation member provided between the first rotor and the bearing, the relaxation member relaxing a stress applied to the bearing in a radially outward direction by thermal expansion of the first rotor, wherein the relaxation member includes a securing portion provided in an outer circumferential portion of the relaxation member to which the bearing is secured, and an engagement portion provided at an inner circumferential portion of a first end of the relaxation member which engages a small diameter cylindrical portion of the first shaft, and wherein an axially extending, annular groove extending along an entire circumference of the relaxation member is formed between the engagement portion and the securing portion.