Patent · US Expired

Vacuum pump having an evacuated gear chamber

US4632650A · kind A · utility

16Cited by

7References

18Claims

0Family size

Assignee

Leybold-Heraeus GmbH · DE

Inventors

Peter Frieden · Cologne, DE
Hans-Peter Kabelitz · Cologne, DE
Karl-Heinz Ronthaler · Zülpich, DE
Jorg Thielicke · Cologne, DE

Key dates

Filing date	Dec 12, 1984
Grant date	Dec 30, 1986
Priority date	—
Expiry date	Dec 12, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S277/927
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A vacuum pump includes an evacuation chamber, a gear chamber, a partition separating the evacuation chamber from the gear chamber, a rotary pump shaft extending through the partition and having one end connected to a vane arranged for rotation in the evacuation chamber and having another, opposite end extending into the gear chamber, a shaft bearing surrounding the pump shaft and received in the partition, a labyrinth seal surrounding the pump shaft and received in the partition for sealing the evacuation chamber from the gear chamber, an oil sump defined in the gear chamber for accommodating oil therein, an evacuation device for generating a vacuum in the gear chamber and an oil loss preventing arrangement for avoiding an oil deficiency in the gear chamber due to the vacuum generated therein.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.