Patent ID: 9033840
Filing Date: 2015-05-19
Classification: B60K,F16H

Abstract:
1. A speed reduction mechanism, comprising: a rotary shaft with an eccentric portion; an input member that is an external gear rotatably arranged on an outer periphery of the eccentric portion of the rotary shaft and having a plurality of through-holes arranged around an axis of the input member at equal angular intervals; a rotation force applying member that is an internal gear meshed with the input member and having teeth of which the number is larger than the number of teeth of the external gear; an output mechanism having plurality of output members that receive rotation force applied to the input member by the rotation force applying member and output the rotation farce to an output target as torque of the output target, and that are passed through the respective through-holes; and a bearing mechanism arranged on an axis of the output mechanism and including a first rolling bearing and a second rolling bearing that are arranged in parallel with each other in an axial direction of the output target, wherein the output target is rotatably supported by the first and second rolling bearings of the bearing such that an outer periphery of the first rolling bearing faces an inner periphery of a housing that accommodates the output target, the housing being made of a material having a stiffness lower than a stiffness of a material of the rotation force applying member, and an entirety of an outer periphery of the second rolling bearing contacts an inner periphery of the rotation force applying member, wherein a first axial side face of the second rolling bearing is in contact with a step face of the rotation force applying member and a second axial side face of the second rolling bearing faces a protrusion of the housing that supports the rotation force applying member.