Patent ID: 6893368

Claim:
A driving force transmission apparatus for an engine comprising: a rotating shaft for transmitting rotational driving force; a pulley positioned about the rotating shaft and driven by the engine; a motor for generating a driving force; a connecting portion fixed to the rotating shaft for directly transmitting the driving force of the motor to the rotating shaft; an inner cylinder portion of the pulley having a first inner cylinder portion and a second inner cylinder portion which are axially adjacent to each other with an opening portion interposed therebetween, a first rolling bearing and a one-way clutch each disposed between the first inner cylinder portion and the connecting portion, said clutch disengaging between the first inner cylinder portion and the connecting portion at engine low speed enabling transmission of the driving force of the motor to the rotating shaft and being engaged between the first inner cylinder portion and the connecting portion at a higher engine speed enabling the pulley to drive said rotating shaft; and the first rolling bearing having an array of rolling elements, and a second rolling bearing disposed between the second inner cylinder portion and a fixed-side member.