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US 8,569,918 B2Granted
Bearing assembly
AssigneeABB AB
InventorsPeter Isberg, Per-Olof Lindberg
Life of this patent
Estimating the term…
Abstract
A bearing assembly for an electrical motor, including a shaft, a housing, and a main bearing between the shaft and the housing, the shaft being surrounded by a rigid sleeve for functioning as an auxiliary bearing in case of a breakdown of the main bearing and as a grease sealing under normal operation.
Claims11
A bearing assembly for an electrical motor, the bearing assembly comprising:
- a shaft, a housing, and a main bearing between the shaft and the housing,
- a rigid sleeve surrounding the shaft and being configured to function as an auxiliary bearing in case of a breakdown of the main bearing, and
- a clearance between the sleeve and the shaft, the clearance being smaller than an air-gap between a stator and a rotor of the motor,
- wherein the sleeve has a portion of a conical inner surface facing the shaft and having an increasing diameter towards the main bearing, the sleeve together with a centrifugal effect of the rotating shaft providing a pumping action that directs grease from a region of the conical inner surface towards the main bearing.
1 more element
An electrical motor comprising a bearing assembly comprising:
- a shaft, a housing, and a main bearing between the shaft and the housing,
- a rigid sleeve surrounding the shaft and being configured to function as an auxiliary bearing in case of a breakdown of the main bearing, and
- a clearance between the sleeve and the shaft, the clearance being smaller than an air-gap between a stator and a rotor of the motor,
- wherein the sleeve has a portion of a conical inner surface facing the shaft and having an increasing diameter towards the main bearing, the sleeve together with a centrifugal effect of the rotating shaft providing a pumping action that directs grease from a region of the conical inner surface towards the main bearing.
1 more element
Dependencies are inferred from the claim text.