Filling of a volume accumulator in a camshaft adjuster

US8991344B2 · kind B2 · utility

Assignee

• Schaeffler Technologies AG & Co. KG · DE

Inventors

• Jens Schafer · Herzogenaurach, DE
• Martin Steigerwald · Herzogenaurach, DE
• Michael Busse · Herzogenaurach, DE
• Jurgen Plate · Gerhardshofen, DE
• Steffen Racklebe · Herzogenaurach, DE
• Andreas Wedel · Emskirchen, DE
• Olaf Boese · Nuremberg, DE
• Robert Heinemann · Dover, US

Key dates

• Filing date: Jan 18, 2013
• Grant date: Mar 31, 2015
• Expiry date: Jun 17, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7837
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A directional valve (30) for controlling a hydraulic oil flow from a pressure port (34) via working chambers of a camshaft adjuster (4) to a tank port (58). The directional valve (30) includes an accumulator port (36) for conducting at least a part of the hydraulic oil flowing out of a working chamber into a volume accumulator (54) before said hydraulic oil flows out into the tank port (58), and the accumulator port (36) is connected via a passage (60) to the pressure port (34).