| 摘要 |
<p>Disclosed is a torsional vibration attenuation apparatus comprising a driving rotation member and a driven rotation member which can be twisted in an enlarged torsion angle range with a non-linear torsional property, thereby preventing an excessively large torque from being transmitted from driving member to the driven member. The torsional vibration attenuation apparatus 1 comprises a boss 5, a cam member 6 having a cam surface 6a formed in an elliptical shape and provided on the outer peripheral portion of the boss 5 to be integrally rotated with the boss 5, and a pair of arm members 19 each provided between the cam member 6 and a coil spring 4 and having one end held in contact with the can surface 6a and the other end held in engagement with a spring seat of the coil spring 4. Each of the arm members 19 is swingable about a center axis of a pin 18 extending between the disc plates 7, 8. The torsional vibration attenuation apparatus is partly constituted by a needle bearing between the contact surfaces of the cam member 6 and the one end portion of the arm member 19.</p> |
