Switchable pressure supply device comprising a passive auxiliary pressure accumulator

US8485152B2 · kind B2 · utility

Assignee

• Schaeffler Technologies AG & Co. KG · DE

Inventors

• Mathias Boegershausen · Erlangen, DE
• Michael Busse · Herzogenaurach, DE
• Eduard Golovatai-Schmidt · Hemhofen, DE
• Andreas Strauss · Forchheim, DE

Key dates

• Filing date: Nov 17, 2010
• Grant date: Jul 16, 2013
• Expiry date: Nov 17, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/34446
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A switchable device for supplying at least one consumer of an internal combustion engine with pressure, comprising: a cavity formed inside a camshaft; a first displacement element arranged in the cavity having a first pressure surface which at least partially delimits a first accumulator chamber together with the wall of the cavity; a first energy accumulator which interacts with the first displacement element; a locking mechanism by which the first displacement element can be locked in the second end position; a switching mechanism which can be actuated by an actuator, having a switch element that can be brought into at least two switching positions; a second displacement element arranged in the cavity having a second pressure surface which at least partially delimits a second accumulator chamber together with the wall of the cavity; a second energy accumulator which interacts with the second displacement element; the first accumulator chamber and the second accumulator chamber communicating with each other and being connectible to a pressure source in a fluid-conducting manner.