Mechanic-hydraulic actuating element for a belt tightener

US4790801A · kind A · utility

Assignee

• INA-WALZLAGER SCHAEFFLER KG · DE

Inventors

• Dieter Schmidt · Steinhagen, DE
• Dieter Goppelt · Herzogenaurach, DE

Key dates

• Filing date: Apr 4, 1988
• Grant date: Dec 13, 1988
• Expiry date: Apr 4, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2007/0891
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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 heli…