The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1990
Filed:
May. 23, 1989
Koichi Fukuo, Saitama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
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.