Variable stroke valve drive for an internal combustion engine

Details Variable stroke valve drive for an internal combustion engine Variable stroke valve drive for an internal combustion engine

2007-06-05

2007-06-05

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090310

Reexamination Certificate

active

11506943

ABSTRACT:
A variable stroke valve drive for an internal combustion engine, including an intermediate lever which is slidingly arranged on a crank path of a crank arm the intermediate lever has a working cam with null lifting cam and lifting cam portions. The working cam contacts a gas exchange valve via an intermediate element. A first adjustment element rotates the intermediate lever against a spring element around a point located near the crank, the intermediate lever being displaceable along the crank path by a second adjustment element. The first adjustment element is provided with a cam plate whose radius continuously increases or reduces on a circumference with respect to an axis of rotation. The inventive variable stroke valve drive substantially reduces wear in a valve drive.

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patent: 2003/0226530 (2003-12-01), Werler
patent: 2004/0144347 (2004-07-01), Schleusener et al.
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International Search Report dated Apr. 19, 2005 with an English translation of the pertinent portion (Fourteen (14) pages).
German Search Report dated Oct. 6, 2004 with an English translation of the pertinent portion (Eight (8) pages).

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