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US 7,604,414 B2Granted
Electrical machine and its bearings
AssigneeSiemens Aktiengesellschaft
InventorDaniel Verhoeven
Life of this patent
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Abstract
An electrical machine includes a housing and a shaft which is housed in the housing by means of a fixed bearing and a free bearing. The fixed bearing is formed by two grooved ball bearings which are respectively prestressed in opposite directions by springs. Thus, at least one of the two grooved ball bearings is always prestressed independently of the axial force exerted on the shaft, such that the required radial stiffness of the fixed bearing is guaranteed.
Claims7
An electrical machine, comprising:
- a housing;
- a first bearing device constructed as a movable bearing and having an outer ring received in the housing;
- a second bearing device constructed as fixed bearing having two deep groove ball bearings, each having an outer ring received in the housing;
- a spring device acting on the outer rings for prestressing the two deep groove ball bearings to one another;
- a shaft rotatably supported by the first and second bearing devices, with the first and second bearing devices having inner rings secured to the shaft;
- and
- a spacer to maintain the inner rings of the two deep groove ball bearings in fixed axial spaced-apart relationship.
4 more elements
Dependencies are inferred from the claim text.