Patent · US Expired

Proportional pressure-regulator valve

US6837477B2 · kind B2 · utility

3Cited by

4References

22Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Karlheinz Mayr · Zell im Wiesental, DE
Walter Kill · Friedrichshafen, DE
Thilo Schmidt · Meckenbeuren, DE
Gunter Philipp · Friedrichshafen, DE
Hubert Remmlinger · Friedrichshafen, DE

Key dates

Filing date	Sep 17, 2003
Grant date	Jan 4, 2005
Priority date	—
Expiry date	Sep 17, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG05D16/2022
WIPO fieldControl
WIPO sectorInstruments

Abstract

A proportional pressure-regulator valve comprising a load-dependent control step and a method for the load-dependent regulation of a pressure level of a pressure medium with one proportional pressure-regulator valve. The load-dependent control step is obtained with a proportional magnet (1) having at least two gaps (10, 12) for regulating the magnetic force. The size of the gaps (10, 12) can be adjusted independently of each other. While a first gap (!2) is current-dependent regulated, the size of the second gap (10) can be regulated via a pressure force adaptable in proportion to a load requirement in the hydraulic circuit.

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