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:
Apr. 17, 1990
Filed:
Sep. 22, 1988
Toru Yagi, Saitama, JP;
Yoshiaki Hirosawa, Saitama, JP;
Kaname Tokita, Saitama, JP;
Yoshihiro Fujiyoshi, Saitama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A valve operation control system in an internal combustion engine, comprising an engine valve openably and closably supported on an engine body, a valve spring for biasing the engine valve in a valve closing direction, and valve driving means interposed between a valve-operating cam and the engine valve to transmit a force in the valve-opening direction provided by the valve-operating cam to the engine valve. The valve driving means includes a valve-opening resilient member for exhibiting a repulsive force in a direction to open the engine valve, and closed-position retaining means is interposed between the engine valve and the valve operating cam for retaining the engine valve at its closed position, with a valve-opening force provided by the valve-operating cam being accumulated by the valve-opening resilient member. The closed-position retaining means is arranged to be switchable between a retaining state and a releasing state to control the timing of opening the engine valve depending upon the operational condition of the engine.