Switchable valve-drive component
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United States of America Patent
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Apr 29, 2008
Grant Date -
Oct 12, 2006
app pub date -
Mar 14, 2006
filing date -
Apr 11, 2005
priority date (Note) -
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Abstract
A switchable valve-drive component (1) for variable transmission of a stroke generated by one or more cam projections to a gas-exchange valve of an internal combustion engine is provided. The valve-drive component (1) has transmission elements (3, 4), which can be connected with a positive fit by coupling elements (8) in the transmission direction, in which force transmission surface sections (16) of the coupling elements (8) can be clamped between force transmission surface sections (20) of the transmission elements (3, 4). Here, at least one of the force transmission surface sections (16, 20) should be provided with a wear protection layer (23). This layer comprises at least one metal-free amorphous hydrocarbon layer with sp.sup.2-hybridized and sp.sup.3-hybridized carbon.
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