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Ceramic Tappets Cast in Aluminum Alloy for Diesel Engines
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English
Abstract
The authors developed, for use in diesel engines, ceramic tappets cast in aluminum alloy that drastically improved wear resistance and valve train dynamics.
The ceramic tappets consist of two parts: a ceramic head, which contacts the cam and push rod, and a tappet body made of aluminum alloy. Concerning the ceramic, silicon nitride was the best material of the three ceramics evaluated in the tests and the sliding surface, in contact with the cam and push rod, was left unground. As for the aluminum alloy, hyper-eutectic aluminum-silicon alloy with a controlled pro-eutectic silicon size was selected.
A reliability analysis using the finite-element method (FEM) was also made on the structure of the ceramic tappet for enhanced durability and reliability.
The combination of this tappet and a cam made of hardened ductile cast iron, hardened steel, or chilled cast iron, respectively exhibits excellent wear resistance.
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Citation
Matsui, T., Kobayashi, M., Okamura, H., Kato, K. et al., "Ceramic Tappets Cast in Aluminum Alloy for Diesel Engines," SAE Technical Paper 900403, 1990, https://doi.org/10.4271/900403.Also In
References
- Kano et al. “The Effect of the EGR System on Valve Train Wear in Diesel Engine” Journal of Japan Society of Lubrication Engineers 32 12 1987
- Ogawa Y. et al. “Ceramic Rocker Arm Insert for Internal Combustion Engines” SAE 860397
- Eyre T.S. et al. “Friction and Wear of Some Ceramics in an Overhead Finger Follower System” SAE 860398
- Aronov V. “Wear Mechanisms of Partially Stabilized Zirconia” SAE 870420
- Ohata Y. et al. “Development of High Wear Resistance Al-Si Alloy” Bulletin of the Japan Institute of Metals 24 4 1985
- “Mechanical Properties of Ceramics” The Ceramic Society of Japan 22 1979