Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1990-06-26
1991-10-08
Okonsky, David A.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9051, 123 9039, 74519, 74559, F01L 118
Patent
active
050544403
ABSTRACT:
A cam follower device which is incorporated in a valve driving mechanism for an engine to contact the outer peripheral surface of a cam secured to a cam shaft that rotates synchronously with a crankshaft of the engine, thereby transmitting the motion of the cam to a valve that opens and closes a suction port or an exhaust port in the enigne. A ring-shaped member which contacts the cam is formed from a ceramic material, and this ceramic ring-shaped member is rotatably supported around a steel shaft. The clearance between the inner peripheral surface of the ceramic ring-shaped member and the steel shaft is set within a specific range, thereby preventing the occurrence of problems, for example, noise, arising due to a difference in thermal expansion coefficient between the two members and thus improving the high-speed follow-up performance of the cam follower device.
REFERENCES:
patent: 4607599 (1986-08-01), Buente et al.
patent: 4628874 (1986-12-01), Barlow
patent: 4727832 (1988-03-01), Miyamura et al.
patent: 4768476 (1988-09-01), Behnke et al.
patent: 4872429 (1989-10-01), Anderson et al.
Lo Weilun
Nippon Seiko Kabushiki Kaisha
Okonsky David A.
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