Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1989-05-23
1990-05-22
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9044, 123 9017, F01L 134
Patent
active
049268040
ABSTRACT:
A mechanism for switching valve operating modes in an internal combustion engine that has a valve operating mechanism with high- and low-speed cams having different cam profiles corresponding to rotational speed ranges of the engine, a pair of valves disposed in intake or exhaust ports of a combustion chamber and a normally urged to be closed by spring means, a directly moving transmitting member for imparting the lift of the low-speed cam to the valve, a pair of idling transmitting members for transmitting the lift of said high-speed cam on the pair of valves and a selective coupling mechanism for selectively connecting the transmitting members when mutually adjacent portions of the transmitting members are in a predetermined positional relationship. The diameter of the base-circle portion of the high-speed cam is smaller than the diameter of the base-circle portion of the low-speed cam whereby the selective coupling mechanism may be readily operated to connect the transmitting members without compressing the valve springs.
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Honda Giken Kogyo Kabushiki Kaisha
Lo Weilnn
Myhre Charles J.
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