Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1988-11-17
1990-04-24
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9055, F01L 134, F01L 114
Patent
active
049190890
ABSTRACT:
A valve-operating system for an internal combustion engine, which system includes a valve-driving piston slidably received in a cylinder body and operatively connected at one end of the piston to an engine valve spring-biased in a closing direction. A check valve and an orifice are interposed between a hydraulic pressure generating means for generating an oil pressure for causing opening of the engine valve and a damper chamber defined between the cylinder body and the valve-driving piston. The check valve permits only the flow of working oil from the hydraulic pressure generating means to the damper chamber. The orifice restricts the return of working oil from the damper chamber to the hydraulic pressure generating means. The orifice is made sufficiently short relative to its width to reduce the influence due to viscosity variations of the working oil to an extremely small level.
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Aoki Takatoshi
Fujiyoshi Yoshihiro
Fukuo Koichi
Nagase Hidenobu
Honda Giken Kogyo Kabushiki Kaisha
Lo Weilun
Myhre Charles J.
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