Improvements in cam contacting devices

Details Improvements in cam contacting devices Improvements in cam contacting devices

F - Mech Eng,Light,Heat,Weapons

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F01L 1/047 (2006.01) F01L 1/08 (2006.01) F01L 1/14 (2006.01) F01L 1/16 (2006.01) F01L 3/06 (2006.01) F01L 3/22 (2006.01) F02M 57/04 (2006.01) F02M 69/04 (2006.01)

Patent

CA 2417674

The invention relates to improved cam contacting devices for use in internal combustion engines and preferably for use in internal combustion engines having variable valve timing. In particular, the use of ceramics including silicon nitride and silicon carbide have been demonstrated as providing effective cam contacting surfaces allowing an axially displaceable cam shaft having a variable profile cam to be run with resulting improvements in idle speed and volumetric efficiency.

L'invention concerne des dispositifs de contact de came améliorés utilisés dans des moteurs thermiques et, de préférence, dans des moteurs thermiques à réglage de distribution variable. On a découvert, en particulier, que l'utilisation de céramiques, notamment du nitrure de silicium et du carbure de silicium, fournissant des surfaces de contact efficaces à un arbre à cames axialement mobile qui possède une came à profil variable, permet d'obtenir des améliorations du ralenti et de l'efficacité volumétrique.

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