Patent · US Expired

Two stage pump having an electromotor device

US4336002A · kind A · utility

22Cited by

4References

4Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Klaus Rose · Mundelsheim, DE
Ulrich Kemmner · Sachsenheim, DE
Karl Ruhl · Gerlingen, DE

Key dates

Filing date	May 16, 1977
Grant date	Jun 22, 1982
Priority date	—
Expiry date	May 16, 1997

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04D13/0653
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

There is described a pump assembly which, in a unitary structure, comprises an electric pump drive motor and a two stage pump contained within a common housing. The motor drives the first stage of the pump upstream of the second stage which supplies the fuel, by creating a higher output from the first stage, which supply pressure is produced on the suction side of the second stage to maintain the pressure build-up in the pump. An air discharge is provided ahead of the inlet to the suction side of the second stage to dispell gases created in the fuel by the elevated pump pressures.

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