Schaeffler Technologies Ag & Co .kg

Jürgen Kretschmer

Peter Sailer

Wolfgang Christgen

Matthew Evans

Jochen Tovar

David Kehr

Michael Kugler

Max Schafer

Thomas Kern

Chad Lee

Max SCHÄFER

A double-flow hydraulic support element for a switchable finger lever of a valve train of an internal combustion engine is provided. A piston is arranged in an axial bore of the housing of the support element in an axially movable manner, and the piston includes a hollow cylindrical pressure part and a cup-shaped working part. A head of the pressure part is used as a support for the finger lever and projects beyond the housing edge, and an opening for the flow of a hydraulic medium is formed in the end face of the head. The housing has a first passage and a second passage axially spaced from the first passage for the hydraulic medium. The support element has a hydraulic play compensation device with a ball non-return valve for the finger lever. In order to achieve an optimal actuation of the coupling element, a sleeve which is closed on one side is inserted into the pressing part; the closed end of the sleeve reaches the region of an outer annular groove in a sealing manner below the dome-shaped head of the pressing part; a storage space for supplying the play compensation device with the hydraulic medium is formed radially within and axially outside of the sleeve, in the pressure part, and in the working part of the piston; the storage space is connected to the first passage in the housing via a passage opening in the working part; an actuation space formed between the sleeve and the pressure part of the piston for hydraulically supplying the coupling device is connected to the second passage in the housing via a radial passage opening in the pressure part; and the volume of the storage space is substantially greater than the volume of the actuation space.

Support element

The invention relates to a hydraulic support element for valve drive of a combustion engine, with a pot cylindrical casing and a hollow cylindrical piston guided axially movably therein, the inner end of which is supported via a spring on the bottom wall of the casing, whose outer end projects past the outer margin of the casing and is formed as a hemispherical bearing head, and whose inner space is subdivided by means of a partition element into an axially inner supply-pressure space and an axially outer switching-pressure space.

Hydraulic support element

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Fürth, Germany

Jürgen Kretschmer