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(11) | EP 2 657 567 A8 |
(12) | CORRECTED EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | TORSIONAL OSCILLATION DAMPING DEVICE |
(57) Disclosed is a torsional vibration attenuation apparatus which can prevent a first
rotation member and a second rotation member from being twisted with each other alternately
to a positive side and to a negative side, while suppressing large torsional vibrations
from being generated by widening the scope of the torsion angle of the first rotation
member and the second rotation member. The torsional vibration attenuation apparatus
1 comprises a boss 5, a cam member 6 disposed in the circumferential portion of the
boss 5 and having a cam surface 6A integrally rotated with the boss 5, and an arm
member 19 disposed between the cam member 6 and a coil spring 4. The arm member 19
having one end portion held in contact with the cam surface 6A and the other end portion
held in engagement with a spring seat 16 for the coil spring 4, is swingable around
a pin 18 bridged between disc plates 7, 8. The curvature of the cam surface 6, with
which the one end portion of the arm member 19 is brought into contact when the boss
5 is twisted in a positive side with respect to the disc plates 7, 8, is larger than
the curvature of cam surface 6A, with which the one end portion of the arm member
19 is brought into contact when the boss 5 is twisted from a neutral position in a
negative side with respect to the disc plates 7, 8.
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