| 摘要 |
A pair of ball bearings 19, 19 and a roller clutch 20 are provided between the outer peripheral surface of the sleeve 18 fitted and fixed onto the rotating drive shaft of a starter motor and the inner peripheral surface of the pulley element 17 around which an endless belt for starting an engine extends. The roller clutch 20 has a concave section 32 on the inner peripheral surface of the clutch outer ring 30 to define a cam surface 31 . After the engine is started, the rollers 33, 33 move toward the bottom of the concave section 32 against the resilient force of the springs 40 . And, the rolling contact surface of the rollers 33, 33 is separated from the outer peripheral surface of the clutch inner ring 29 . Consequently, the friction heat which would be produced after the engine start is suppressed, and a structure having an excellent durability as a unit for starting the engine of the idling-stop vehicle is realized.
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