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US 6,888,276 B2Granted
Electric motor
AssigneeJohnson Electric S.A.
InventorJames Ching Sik Lau
Life of this patent
Estimating the term…
Abstract
In an electric motor, a shaft 12 is supported by a sleeve bearing 10 and axial movement of the shaft 12 through the bearing 10 is restricted by an abutment 20 supported by or as a part of spacer 14. The abutment 20 has a thrust face 22 which bears against an end face 16 of the bearing 10 creating a thrust/bearing interface. The thrust face 22 has a part spherical profile to accommodate variations in the alignment between the bearing 10 and the shaft 12 due to manufacturing tolerances, etc.
Claims12
A miniature electric motor having:
- a stator;
- a rotor having a shaft;
- a sleeve bearing supporting the rotor and having an axial face facing the rotor;
- and
- an abutment on the shaft having a thrust face opposing the end face of the bearing;
- wherein the thrust face is profiled with an axial separation between a radially inner location adjacent the shaft and a radially outer location adjacent the periphery of the abutment with the inner location projecting towards the bearing whereby an outer edge of the abutment is spaced from the bearing.
3 more elements
Dependencies are inferred from the claim text.