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:
Dec. 13, 1988
Filed:
Apr. 04, 1988
Dieter Schmidt, Nuremberg, DE;
Dieter Goppelt, Aurachtal, DE;
INA Walzlager Schaeffler KG, , DE;
Abstract
A mechanical-hydraulic actuating element for a belt tightener especially for internal combustion engines comprising a piston (11) guided in a cylinder (10) between which a spring (14) acts so that piston (11) and cylinder (10) are urged apart wherein a pressure space (19) as defined by piston (11) and cylinder (10) is separated from an oil reservoir (16) by a check valve (20) which allows the free oil passsage from the oil reservoir (16) into the pressure space (19) while the annular gap between piston (11) and cylinder (10) is dimensioned so that oil can flow under pressure which counteracts the force of the spring (14) from the pressure space (19) into the oil reservoir (16) through the annular gap, characterized in that the oil reservoir (16) is designed as a circular ring-shaped hollow space which surrounds the cylinder (10) and is defined toward the outside by a hollow cylindrical cup-shaped housing (15) which is sealed at its open end by an elastic bellows seal (29) attached to the housing (15), on the one hand, and to an element (28) connected to the piston (11), on the other hand, and the spring (14) acting between the piston (11) and the cylinder (10) is designed as a helical spring arranged in the circular ring-shaped reservoir space (16).