Sealed seat for a hydraulic switching element in a mounting space for a direct-controlled cartridge valve in an insertion bore

US6089575A · kind A · utility

Assignee

• INA Wälzlager Schaeffler oHG · DE

Inventors

• Rainer Ottersbach · Bonn, DE
• Andreas Strauss · Forchheim, DE

Key dates

• Filing date: Mar 9, 1998
• Grant date: Jul 18, 2000
• Expiry date: Mar 9, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S277/927
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A sealing arrangement for a direct-controlled cartridge valve in an insertion bore, which valve is arranged in a hydraulic system of a device for varying the valve timing of an internal combustion engine wherein to avoid leakages between the individual annular chambers (20, 21, 22) in the insertion bore (23) resulting from the radial clearance between the annular webs (8, 9, 10) of the cartridge (5) and the bore wall (24) of the insertion bore (23), the annular webs (8, 9, 10) on the outer peripheral surface (6) of the cartridge (5) are made with a smaller diameter than the insertion bore (23) and additionally comprise annular grooves (14, 15, 16) into which annular sealing elements (17, 18, 19) made of a shear-resistant material are inserted, and leakages between the sealing elements (17, 18, 19) and the cartridge (5), as also leakages between the sealing elements (17, 18, 19) and the bore wall (24) of the insertion bore (23) are sealed by a static radial force resulting from the pre-stress of the sealing elements (17, 18, 19) and/or by a dynamic sealing force resulting from pressure differences of the hydraulic pressure medium between the individual annular chambers (20, 21, 22).