| 摘要 |
A coaxial engine starter comprising an electric motor (1) having a hollow armature rotary shaft (2) rotatably supported by a housing (17) and an output rotary shaft (3) coaxially slidably disposed within the armature rotary shaft (2) and having a pinion (4) at a front end thereof. The motor housing has a central bore within which the armature rotary shaft (2) and the plunger rod (6a) are disposed to define an annular clearance between the housing and the plunger rod (6a). Disposed behind the motor (1) is a solenoid switch (5) having a magnetically movable iron core (6) including a plunger rod (6a) coaxially slidable relative to the armature rotary shaft (2) for operatively pushing forward the output rotary shaft (3) within said hollow armature rotary shaft (2). An oil seal ring (19) extending circumferentially around the armature rotary shaft (2) is mounted to the housing (17) between the solenoid switch (5) and the motor ( 1) for sealingly contacting the armature rotary shaft (2) to seal the annular clearance therearound. The seal ring also maintains the armature rotary shaft (2) in a concentric relationship with respect to the armature rotary shaft (2).
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