Torsional vibration attenuation apparatus

摘要

A torsional vibration damping device is configured to have hysteresis torques in the positive and negative sides varied by a simple construction, thereby improving the efficiency of production work and preventing an increase in production cost. Friction materials are respectively provided on surfaces of a hub member and the disc plates, the surfaces facing each other in the radial direction when the hub member is twisted in the positive side with respect to the disc plates. The friction materials are to be brought into friction contact with each other when the hub member is twisted by a specific angle with respect to the disc plates.

主权项

1. A torsional vibration attenuation apparatus, comprising:
a first rotation member; a second rotation member provided to be relatively rotatable with respect to the first rotation member; a resilient member provided between the first rotation member and the second rotation member and resiliently deformable between the first rotation member and the second rotation member in response to a relative rotation of the second rotation member with respect to the first rotation member in a positive side and a negative side; and a hysteresis mechanism having the first rotation member and the second rotation member frictionally contacted with each other, the hysteresis mechanism including hysteresis torque generation members and friction contact members, the hysteresis torque generation members being provided to extend in the circumferential direction of the first rotation member and the second rotation member to be frictionally contactable with the first rotation member and the second rotation member to generate the hysteresis torques when the second rotation member is twisted in the positive side and the negative side with respect to the first rotation member, the hysteresis torque generated when the second rotation member is twisted in the positive side being identical to the hysteresis torque generated when the second rotation member is twisted in the negative side, the friction contact members being respectively constituted by a first friction material provided on the first rotation member and a second friction material provided on the second rotation member, the first rotation member and the second rotation member respectively having facing surfaces facing each other and provided thereon with the first friction material and the second friction material respectively to have the first friction material and the second friction material frictionally contacted with each other, so that there is generated a sliding resistance between the first friction material and the second friction material in response to the relative rotation of the second rotation member with respect to the first rotation member in the positive side, the first friction material and the second friction material being spaced apart from each other in the rotation direction of the first rotation member in response to the relative rotation of the second rotation member with respect to the first rotation member in the negative side; in which each of the first friction material and the second friction material is set to have a contact resistance with the hysteresis torque generated in response to the relative rotation of the first rotation member in the positive side with respect to the second rotation member being larger than the hysteresis torque generated in response to the relative rotation of the second rotation member with respect to the first rotation member in the negative side.