Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1994-10-21
1997-07-15
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9052, 123 906, F01L 116, F16H 5306
Patent
active
056473133
ABSTRACT:
A combination of an adjusting shim and a cam used in a valve train in an internal combustion engine for automobiles, the adjusting shim composed of a ceramic material which sets the surface roughness of a sliding surface of the adjusting shim with respect to a cam to not more than 0.1 .mu.m in ten-point mean roughness Rz, and which contains not less than 60 vol. % of silicon nitride or sialon, and the cam composed of cast iron a surface of which is chill hardened and then provided with a phosphate film thereon. The combination of an adjusting shim and a cam is capable of smoothing a sliding surface of the cam by the break-in of the part even if the cam is not subjected to a super-precision finishing process; preventing the seizure and abnormal abrasion of sliding surfaces; stabilizing a smoothed condition of the sliding surfaces of the cam and shim for a long period of time; and providing excellent sliding characteristics of the sliding surfaces owing to a decrease in the friction coefficient thereof.
REFERENCES:
patent: 4761344 (1988-08-01), Maki et al.
patent: 4850095 (1989-07-01), Akao et al.
patent: 5013611 (1991-05-01), Suzuki et al.
patent: 5323742 (1994-06-01), Hamada
patent: 5372099 (1994-12-01), Matsunuma et al.
Patent Abstracts of Japan, vol. 12, No. 57 (M-670) ; Feb. 20; 1988 JPA-62-203,908 ; Sep. 8; 1987.
Izumida Hiromu
Matsunuma Kenji
Murabe Kaoru
Nishioka Takao
Yamakawa Akira
Lo Weilun
Sumitomo Electric Industries Ltd.
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