| 摘要 |
A starter motor includes an electric motor, an epicyclic reduction gear mechanism driven by the electric motor, and a pinion gear wheel driven from the output member of the epicyclic reduction gear mechanism. The output member of the epicyclic gear mechanism is the planetary gear carrier of the mechanism and the annular gear of the mechanism is held against rotation relative to the frame of the starter motor by a torque limiting clutch, which slips when the annular gear is subjected to a torque in the direction opposite to that to which it is subjected during cranking of the associated engine, and in excess of a predetermined value, thereby limiting the torque to which the epicyclic gear mechanism and the remainder of the starter motor drive train is subjected. |
