Patent ID: 7048661
Filing Date: 2006-05-23
Classification: F16D,F16H,Y10T

Abstract:
1. A power transmission device for transmitting torque of a driving unit to a driven unit, comprising: a first rotator to be driven for rotation by said driving unit; a second rotator coupled to said driven unit; and at least one torque transmission member made of an elastically deformable material for making contact with said first rotator and said second rotator to transmit torque from said first rotator to said second rotator, wherein an outer periphery of said torque transmission member includes a contact surface for making contact with said rotators and a non-contact surface out of contact with said rotators, said non-contact surface being provided with an oxygen permeance suppression layer made of a rubber having an oxygen permeability less than an oxygen permeability of said contact surface, and when the first rotator rotates, stress causes the torque transmission member to deform.