Patent · US Expired

Hydraulic pump

US4681517A · kind A · utility

11Cited by

4References

7Claims

0Family size

Assignee

Vickers Systems · GB

Inventors

Rene Schulz · Rabenau, DE
Heinz Teubler · Friedrichsdorf, DE
Peter Breuer · Madrid, ES

Key dates

Filing date	Apr 21, 1986
Grant date	Jul 21, 1987
Priority date	—
Expiry date	Apr 21, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB62D6/02
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A hydraulic pump with a falling characteristic curve in respect of the output flow relative to the pump speed. A flow control valve (40) has a spool (41) with a hollow (50) extension portion (49), and an annular chamber (52) with two control edges (53, 56) which co-operate with the valve output duct (38) and a relief duct (19) to form restrictor means which are in opposition to each other. The valve output duct (38) and the relief duct (19) are disposed substantially radially with respect to the spool.

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