Valve operating system for internal combustion engine

Details Valve operating system for internal combustion engine Valve operating system for internal combustion engine

1990-09-07

1993-03-16

Kamen, Noah P.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

F01L 902

Patent

active

051934949

ABSTRACT:
A valve operating system for an internal combustion engine, including a cam having an arcuate base circle portion with the center thereof being aligned with the rotational axis of the cam and a raised portion projecting radially outwardly from the base circle portion, a cam-side piston operatively connected to the cam, a valve-side piston operatively connected to an engine valve, a hydraulic pressure chamber between the cam-side piston and the valve-side piston, an oil pressure supply source connected to the chamber through a check valve, a hydraulic pressure releasing valve connected to the chamber, and a solenoid valve or the like for controlling the operation of the releasing valve. This solenoid valve or the like is arranged to open the releasing valve to release the hydraulic pressure in the hydraulic pressure chamber in accordance with the operational position of the engine valve. This ensures complete seating of the engine valve and enables part of the working oil in the chamber to be periodically replaced to prevent excessive rise in oil temperature.

REFERENCES:
patent: 4466390 (1984-08-01), Babitzka et al.
patent: 4674451 (1987-06-01), Rembold et al.
patent: 4696265 (1987-09-01), Nohira
patent: 4716863 (1988-01-01), Pruzan
patent: 4957075 (1990-09-01), Hasegawa
patent: 5002022 (1991-03-01), Perr

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