To provide a vibration reducing device capable of suppressing deterioration of vibration in starting of an internal combustion engine.
The vibration reducing device 4 for reducing the vibration of a transmission path 3 for transmitting torque between the internal combustion engine 2 and a motor-generator 1 for driving the internal combustion engine in starting includes: a vibration reducing mechanism 10 having a resonance frequency in a frequency band lower than an idle rotation speed; and a clutch mechanism 20 for connecting or disconnecting the vibration reducing mechanism and the transmission path. The clutch mechanism has cam mechanisms 5, 6 for transmitting torque in the transmission path and converting the torque to be transmitted into pressing force of an axial direction or of a radial direction; and clutches 6, 8 being engaged by the pressing force. The cam mechanism generates the pressing force for engaging clutches when input torque from the internal combustion engine exceeds input torque from the motor-generator, and does not generate the pressing force for engaging clutches when the input torque from the internal combustion engine falls below the input torque at least from the motor-generator.
COPYRIGHT: (C)2011,JPO&INPIT
Hiroyuki Amano
Yu Miyahara
Tsutomu Sekine
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Kenta Ito