TORSIONAL OSCILLATION DAMPING DEVICE

摘要

[Problem] To provide a torsional oscillation damping device capable of preventing twisting alternately to the positive side and the negative side when a first rotary member and a second rotary member are shifted to the center position, while suppressing a large torsional oscillation by widening the range of the torsional angle of the first rotary member and the second rotary member. The torsional oscillation damping device (1) is equipped with: a boss (5); a cam member (6) provided at the outer peripheral part of the boss (5) and having a cam surface (6A) that rotates integrally with the boss (5); and arm members (19), which are provided between the cam member (6) and coil springs (4), and one end of which makes contact with the cam surface (6A), the other end of which making contact with the spring sheets (16) of the coil springs (4), and which swing around pins (18) extending between disk plates (7, 8). As for the curvature of cam surface (6A), the curvature of the cam surface (6A) where the one end of the arm members (19) makes contact when the boss (5) is twisted from the center position to the negative side with respect to the disk plates (7, 8) is greater than the curvature of the cam surface (6A) where the one end of the arm members (19) makes contact when the boss (5) is twisted to the positive side with respect to the disk plates (7, 8).