Schaeffler Technologies Ag & Co .kg

Markus Fischer

Friedrich Ness

Tobias Michel

A hydraulic traction mechanism tensioner for a traction mechanism drive of a motor vehicle, having a housing, and a valve which has an actuating element and is inserted in a fluid supply channel of the housing, wherein the valve hydraulically connects a first channel section of the fluid supply channel which opens into the pressure chamber to a hydraulic supply in a first position of the actuating element, and disconnects the first channel section from the hydraulic supply in a second position of the actuating element, wherein the valve is configured as a pressure regulating valve, wherein the actuating element can be moved beyond the second position into at least one further, third position, with the result that a volume of the first channel section is increased in comparison with the second position.

Hydraulic traction mechanism tensioner including a pressure regulator

A hydraulic tensioning device for a chain device, having a housing and having a clamping piston guided displaceably in a housing bore of the housing, the clamping piston having a piston cavity with a hardened inner circumferential surface, and also having a pressure relief valve unit arranged in the piston cavity. The pressure relief valve unit () is a preassemblable unit and includes a spring (), a closing body () and a valve seat () and also a receptacle () at least partially enclosing the valve seat (), wherein the valve seat () is made of a metal material, has an at least partially hardened surface and wherein the receptacle () forms a press-fit with the inner circumferential surface of the clamping piston ().

Tensioning device for a chain drive

A hydraulic tensioning device, which is used in traction drives of internal combustion engines and which includes a piston () that is supplied with a hydraulic fluid, is provided. The piston is movably guided in a linear manner in a cylinder and is spring-loaded against a traction device. The hydraulic fluid can flow into a pressure chamber () via a non-return valve or out of the pressure chamber () via a pressure-relief valve (), depending on an adjustment movement direction of the piston (). For this purpose, the pressure-relief valve () is inserted in a central receiving area () of the piston () on the pressure-chamber side as a premountable valve group () and includes a pot-shaped valve housing () and into which a guide element () with a corresponding valve seat (), a valve element designed as a valve plate (), and a pressure spring () are integrated.

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Hessdorf, Germany

Markus Fischer