Patent · US Expired

Hydraulic actuating system and method

US5201175A · kind A · utility

1Cited by

5References

7Claims

0Family size

Assignee

Alfred Teves GmbH · DE

Inventors

Manfred Kahrs · Wiesbaden, DE
Gerhard Kunz · Heiligenhaus, DE
Franz Fleck · Frankfurt am Main, DE
Gerhard Schudt · Hanau, DE

Key dates

Filing date	Sep 24, 1991
Grant date	Apr 13, 1993
Priority date	—
Expiry date	Sep 24, 2011

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04B11/0025
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A hydraulic actuating system and method comprises a pump which continuously circulates hydraulic fluid out of a reservoir into a pressure line limited to a predetermined maximum pressure by a pressure-limiting valve and a control valve connected to the pressure line controlling flow of hydraulic fluid to an operating cylinder. A clearance volume in communication with the pressure line collects compressed air entrained in the hydraulic fluid flow which upon opening of the inlet valve expands to displace a portion of the volume of flow of hydraulic fluid required for actuation of the operating cylinder.

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