Patent ID: 7363894
Filing Date: 2008-04-29
Classification: C23C,F01L,Y10T

Abstract:
1. A switchable valve-drive component for variable transmission of a stroke generated by one or more cam projections to at least one gas-exchange valve of an internal combustion engine, comprising at least two transmission elements which can be connected with a positive fit by one or more coupling elements in a transmission direction, wherein force transmission surface sections of the coupling elements can be clamped between force transmission surface sections of the transmission elements, at least one of the force transmission surface sections is provided with a wear protection layer, which comprises at least one metal-free amorphous hydrocarbon layer with sp 2 -hybridized and sp 3 -hybridized carbon, wherein at least one bonding promotion layer and/or at least one intermediate layer is provided between the one or more force transmission surface sections and the wear protection layer, wherein the at least one intermediate layer is formed from metal-bearing hydrocarbon layers, whose metal components comprise W, Ti, Hf, Ge, or a combination thereof, and have a thickness of approximately 0.5 μm to 2.0 μm.