| 摘要 |
A coaxial starter motor comprising a d.c. motor having a hollow rotary shaft extended forward and a planetary speed reduction gear having a sun gear disposed on the outer periphery of the rotary shaft. The starter motor comprises an over-runing clutch of which inner sleeve rotates in one direction and is provided at the inner circumference with helical splines, the over-runing clutch being disposed on the front side of the rotary shaft and rotated at a reduced speed by the planetary gear speed reduction gear. Also provided is an output sleeve mounted on the front end portion of the rotary shaft and having a pinion at its front end portion and axially movably and relatively rotatably supported by a bearing, in which helical splines formed close to the rear portion of the outer periphery is in mesh with helical splines of the inner sleeve. A solenoid switch is disposed on the rear end portion of the d. c. motor, the solenoid switch having an excitation coil, a plunger electromagnetically moved forward when a current flows through the excitation coil, a movable rod connected to the plunger and extenidng into a hollow bore of the rotary shaft to oppose the front wall inner surface of the output sleeve at its front end, the movable rod being moved forward by the forward movement of the plunger to move forward the output sleeve, and a movable contact engagable with a stationary contact by the forward movement of the movable rod for supplying an electrical power to the armature.
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