The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 1990
Filed:
Apr. 14, 1989
Steffen Hertrich, Herzogenaurach, DE;
Dieter Goppelt, Aurachtal, DE;
INA Walzlager Schaeffler KG, , DE;
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 assembling the same.