Belt tensioning device

US4902268A · kind A · utility

Assignee

• INA-WALZLAGER SCHAEFFLER KG · DE

Inventors

• Steffen Hertrich · Nuremberg, DE
• Dieter Goppelt · Herzogenaurach, DE

Key dates

• Filing date: Apr 14, 1989
• Grant date: Feb 20, 1990
• Expiry date: Apr 14, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2007/0887
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A tensioning device for belts, chains and the like particularly for the camshaft drive of an internal combustion engine, with a tension pulley supported on a movable carrier, with a control element, by which in the case of heating, the carrier can be moved via an actuating element against the action of a pressure spring in the slackening direction of the belt characterized in that, the control element consists of a hollow cylindrical sleeve closed at the one end by a bottom and on the other end has a flange extending radially inwards, against which from the inside a washer abuts, which in its center receives a longitudinally movable and sealed pressure piston, in the annular hollow space between the bore of the sleeve and the pressure piston, the pressure spring is arranged whereby it is supported on one hand on the washer and on the other hand on the pressure piston, between the bottom and the pressure piston, whose end face is at a distance from the bottom, a further pressure spring is arranged which with lower resilience opposes the action of the first mentioned pressure spring and the whole inner area of the sleeve is filled with a gas-free expansion fluid and a method of assem…