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US 2007/0297907 A1Published application
Vacuum Pump Impeller
OwnerWolfgang Giebmannsinventor
Life of this patent
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Abstract
The invention relates to a vacuum pump impeller (10) which comprises a shaft (14) made of steel, and a one-piece rotor (12) supported by the shaft (14) and made of a material different from the steel of the shaft. The shaft (14) comprises an axial cavity (22), and the rotor (12) comprises an axial projection (16) seated in the cavity (22) in positive and/or non-positive engagement therewith.
Claims15
A vacuum pump impeller comprising:
- a shaft made of steel, and a one-piece rotor supported by the shaft and made of a material different from the steel of the shaft, shaft defining an axial cavity and the rotor including an axial projection seated in the cavity in positive and/or non-positive engagement therewith.
The vacuum pump impeller according to claim, wherein the rotor is a cast part having its projection cast into the shaft cavity.
A vacuum pump impeller comprising:
- a shaft defining an axial cavity in at least one end thereof;
- a rotor constructed of a material which expands radially outward relative to the steel shaft when drawing a vacuum, the rotor including an axial projection which extends into the shaft axial cavity such that when drawing the vacuum, the rotor axial projection expands into a tighter relationship with shift to avoid slippage.
Dependencies are inferred from the claim text.