Adjusting shim

Details Adjusting shim Adjusting shim

F - Mech Eng,Light,Heat,Weapons

01

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F01L 31/24 (2006.01) C04B 35/593 (2006.01) C04B 35/597 (2006.01) F01L 1/14 (2006.01) F01L 1/16 (2006.01) F01L 1/20 (2006.01)

Patent

CA 2073649

The present invention provides an improved adjusting shim used in a valve train for an internal combustion engine for an automobile. The adjusting shim produced from a base material consisting of a ceramic material containing 80 to 98 wt.% of silicon nitride and/or sialon and has a porosity of not more than 3%, a bending strength of not less than 1.0 GPa and an impact compressive elastic limit (Hugoniot elastic limit) of not less than 15 GPa, wherein the base material is provided on the surface thereof which contacts a cam with a ceramic surface layer having a composition different from that of the base material and a hardness lower than that of the base material. The adjusting shim of the present invention enables a power loss of a valve train to be minimized; the wear resistance thereof to be improved; and the fuel economy, the performance and durability of an internal combustion engine to be improved.

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