Patent ID: 7581626

Claim:
A drive force transmission device configured and arranged to transfer a drive force between an input shaft and an output shaft coaxially disposed with the input shaft, the drive force transmission device comprising: a first direction one-way clutch including a first input shaft side and a first output shaft side with the first direction one-way clutch side being configured and arranged to selectively connect a first force transmission path between the input shaft and the output shaft to transmit rotation in a first rotational direction; a second direction one-way clutch including a second input shaft side and a second output shaft side with the second direction one-way clutch side being configured and arranged to selectively connect a second force transmission path between the input shaft and the output shaft to transmit rotation in a second rotational direction that is opposite to the first rotational direction, the second direction one-way clutch being arranged with respect to the first direction one-way clutch such that the first force transmission path is in parallel with the second force transmission path; a second direction rotation transmission clutch being disposed between the output shaft and the second output shaft side of the second direction one-way clutch to selectively connect the second direction one-way clutch with the output shaft; a cam mechanism operatively coupled to the second direction rotation transmission clutch to engage the second direction rotation transmission clutch in response to rotation of the input shaft in the second rotational direction; and a regulating member operatively coupled to the cam mechanism to regulate movement of the cam mechanism to maintain a disengaged state of the second direction rotation transmission clutch with the cam mechanism, and the regulating member being arranged to be non-rotatable in response to rotation of the input shaft in the first rotational direction.