Switchable valve drive element of an internal combustion engine

Details Switchable valve drive element of an internal combustion engine Switchable valve drive element of an internal combustion engine

2005-07-21

2008-12-02

Denion, Thomas E (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090480, C123S090500, C123S090520, C123S090570, C123S19800E

Reexamination Certificate

active

07458352

ABSTRACT:
A switchable valve drive element of an internal combustion engine can be actuated hydraulically. A valve tappet which can be displaced axially in a bore of the machine housing by the cam of a camshaft. A switching duct adjoins the valve tappet and is filled with a hydraulic oil. A connection on the valve drive element between the switching duct and a space with a lower pressure level compared to the pressure in the switching duct. The connection can be produced between the switching duct and the space with a lower pressure level by means of the valve tappet. The space may be inside the tappet.

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German Search Report 10 2004 038 446.0dated Mar. 30, 2005.

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