Hydraulic tensioner

US7686717B2 · kind B2 · utility

Assignee

• Ina Schaeffler KG · DE

Inventors

• Arbogast Grunau · Weisendorf, DE
• Thomas Bertelshofer · Ebermannstadt, DE
• Eduard Kratz · Hochstädt, DE
• Christian Schäfer · Berlin, DE
• Harald Schäfer · Schifferstadt, DE
• Dietmar Jäger · Langenzenn, DE
• Marco Orsi · Torino, IT

Key dates

• Filing date: Nov 23, 2004
• Grant date: Mar 30, 2010
• Expiry date: Oct 27, 2027

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2007/0859
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A tensioner for a traction drive includes a cylinder arranged in a housing at a distance to a housing wall to thereby define an interior space which contains hydraulic fluid. A piston is received in the cylinder for back-and-forth movement and bounds a pressure chamber containing hydraulic fluid. The piston has a cylinder-distal end which is operatively connected to a spring-biased tension roller supported on a traction member. Formed between the piston and the cylinder is a leakage gap, and a reservoir for hydraulic fluid is provided in an area of the leakage gap to prevent ingress of air into the pressure chamber, when the traction drive is at a rest.