In a motorcycle engine, the tappets convert the rotating motion of the cams to the pitching motion of the valves, and they slide with the cams at a high speed under high pressure. Reducing the friction between the tappets and the cams would increase the power of the engine.We studied a way to reduce the coefficient of friction between tappets and cams by applying a hard thin coating of DLC, MoS2, CrN, or TiN to the tappets. We investigated the adhesion of the coatings with a scratch test and their tribological properties with a ball-on-disk test. We then examined their durability with an engine stand test. We concluded that a tappet coated with DLC effectively reduces friction at the cam and tappet interface and is sufficiently durable to be applied to actual motorcycle engines.
APPLYING HARD THIN COATINGS TO TAPPETS TO REDUCE FRICTION
Sae Technical Papers
Small Engine Technology Conference & Exposition ; 2001
2001-12-01
Conference paper
English
Applying hard thin coatings to tappets to reduce friction
Tema Archive | 2001
|Applying hard thin coatings to tappets to reduce friction
Automotive engineering | 2002
|Engineering Index Backfile | 1945
Engineering Index Backfile | 1955
Engineering Index Backfile | 1953
|