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US 2006/0232153 A1Published application
Rotary electric machine equipped with bearing structure providing enhanced resistance to thrust load
AssigneeDenso Corporation
InventorTatsuya Saito
Life of this patent
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Abstract
A rotary electric machine which may be used as a starter motor in an engine starter. The rotary electric machine includes a bearing which retains an armature shaft rotatably. The bearing is implemented by a plain bearing made of a sleeve and placed in contact of one of opposed ends of an axial length thereof with a shoulder formed on the armature shaft so as to bear a thrust load acting on the armature shaft as a whole, thereby avoiding the local concentration of impact on the bearing to ensure a desired lifetime of the bearing.
Claims7
A rotary electric machine comprising:
- a housing including an end frame;
- an electric motor disposed within said housing, said motor including an armature and an armature shaft, the armature being to be subjected to an electromagnetic force to provide torque to the armature shaft;
- a plain bearing made of a hollow cylindrical wall which has an axial length between opposed ends thereof and retains an end portion of the armature shaft along the axial length;
- and
- a hollow bearing mount formed on the end frame within which said plain bearing is mounted, said bearing mount supporting said plain bearing in abutment with one of the ends of the axial length of said plain bearing so as to have the axial length of said plain bearing bear a thrust load transmitted from the armature shaft.
2 more elements
Dependencies are inferred from the claim text.