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:
Jul. 07, 1981
Filed:
Aug. 06, 1979
Derald H Kraft, Canton, OH (US);
Dyneer Corporation, Canton, OH (US);
Abstract
A hydraulic tensioning device for maintaining a predetermined amount of tensioning force on an endless drive belt for the vehicle accessories drive system. A self-contained hydraulic fluid supply and pump assembly is mounted on the swinging end of a pivotally mounted lever and is moved toward the drive belt by a hydraulically actuated piston which is mounted in a fixed position on the engine. An idler pulley is rotatably mounted on the fluid supply and pump assembly and is engaged with and driven by the drive belt. The drive belt rotates the idler pulley which hydraulically actuates the piston by driving the pump which supplies hydraulic fluid to the piston from the fluid supply. The piston pivots the lever toward the belt whereupon the idler pulley engages the belt and exerts the desired tensioning force on the belt. Check valves in the pump assembly regulate the amount of hydraulic force applied to the piston and ultimately to the belt. A partition member is slidably mounted within the piston cylinder and compensates for small oil leaks in the piston by reducing the effective volume of the cylinder chamber to maintain a constant tensioning force on the belt tensioning lever when the engine is shut off.