Patent ID: 8266983

Claim:
A damper spring device provided between an output shaft of an engine and an input shaft of a gearbox, the damper spring device comprising: a first spring comprising a coil spring and deformable in a rotational direction of the output shaft of the engine and the input shaft of the gearbox; and a second spring located in series with the first spring, on one side of the first spring, capable of being compressed along an axis of the first spring, and configured to be retained by a stopper in such a manner that the second spring is compressed by a preload along the axis, the preload on the second spring being greater than a mounting load of the first spring, the first spring and the second spring having load-deflection characteristics such that the first spring deforms when an axial load acting in the direction of compression of the first spring is not greater than a load at which a strand of the first spring is at least partially compacted and that the first spring and the second spring deform when the axial load is greater than the load at which the strand of the first spring is at least partially compacted.