Flywheel device for prime mover

摘要

There is provided a flywheel device (1) for a prime mover, which can be made compact in the axial size thereof and have an effectively increased inertial mass. The flywheel device is comprised of a drive plate (11) and a mass ring (12). The drive plate has an annular projection (11b) and is attached to a crankshaft (2a) in a manner concentric with the crankshaft. The mass ring has an annular recess (12a) and is concentrically attached to the drive plate by the annular recess being fitted on the annular projection of the drive plate. The flywheel device transmits torque from an engine (2) as the prime mover to the input shaft (31) an automatic transmission while reducing variation in the torque.