Hydraulic valve

US8505582B2 · kind B2 · utility

Assignee

• Hilite Germany GmbH · DE

Inventors

• Patrick Gautier · Stuttgart, DE
• Marc Hohmann · Marktheidenfeld, DE
• Wolf-Dietmar Schulze · Gießen, DE
• Andre Selke · Lohr am Main, DE
• Markus Todt · Jeffery Road, DE

Key dates

• Filing date: Apr 28, 2011
• Grant date: Aug 13, 2013
• Expiry date: Nov 24, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86702
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A hydraulic valve for oscillating-motor camshaft adjuster is provided. The valve has a bush and a hollow piston with a piston bottom. The piston is axially movable within the bush by means of an actuator against the force of a screw-type pressure spring. The actuator is applied to the piston bottom. A sleeve secured in the bush is disposed inside the hollow piston and can be displaced relative to the piston. The wall of this sleeve has at least one through-opening, which leads to at least one opening of the hollow piston, which opening can guide a supply pressure (P) applied inside the sleeve alternatively to two sets of pressure chambers of the oscillating-motor camshaft adjuster. The sleeve has a sleeve bottom that seals off the inside space of hollow piston.