| 摘要 |
PCT No. PCT/JP87/00792 Sec. 371 Date Aug. 15, 1988 Sec. 102(e) Date Aug. 15, 1988 PCT Filed Oct. 16, 1987 PCT Pub. No. WO88/02946 PCT Pub. Date Apr. 21, 1988.An engine starter comprising a motor having a tubular armature rotation shaft, a rotation output shaft arranged on one axial end of the motor and on the coaxial line with the armature rotation shaft and axially slidably supported, a clutch mechanism for transmitting the turning force of the armature rotation shaft to the rotation output shaft and an electromagnetic switch which not only has a shifting member, by means of an electromagnetic force, to push the rotation output shaft in the axial direction to slidably move it, but which brings movable contacts in touch with fixed contacts, thereby to supply power to the motor. The rear part of the rotation output shaft and the front part of the shifting member inserted into the armature rotation shaft tube from opposite directions, the shifting member of the electromagnetic switch, armature rotation shaft and the rotation output shaft are coaxial. For making the whole length of the starter compact in coaxially arranging these parts, a composition preventing invasion of dust into the contact chamber of the electromagnetic switch is adapted. For providing such a compact composition, restrictions are made on the position of the spring as a means for restoring the rotation shaft to its former position after the engine has started.
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