Control valve for controlling pressure-medium flows comprising an integrated check valve

US8757114B2 · kind B2 · utility

Assignee

• Schaeffler Technologies AG & Co. KG · DE

Inventors

• Jens Hoppe · Erlangen, DE
• Lars Buchmann · Erlangen, DE

Key dates

• Filing date: May 6, 2010
• Grant date: Jun 24, 2014
• Expiry date: Jan 1, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/8667
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A control valve for controlling pressure medium flows, including: a valve housing having a hollow construction and having at least one feed connection, at least two working connections, and at least one discharge connection; a control piston held displaceably inside the valve housing, through which, dependent on position, the feed connection can be connected via at least one pressure medium line to the one or to the other working connection, while the respectively other working connection is connected via at least one second pressure medium line to the discharge connection. The control piston has a piston cavity and the first pressure medium line includes a feed opening allocated to the feed connection and a discharge opening allocated to the working connections, with each of these openings opening into the piston cavity. At least one check valve that can be hydraulically opened and that releases the first pressure medium line in the feed direction is provided, having a closing part that has a sealing surface, by which part a valve opening can be closed. The control valve has an elastically deformable closing part, such that the sealing surface thereof is movable, through elastic d…