Valve operation changing system of internal combustion engine

Details Valve operation changing system of internal combustion engine Valve operation changing system of internal combustion engine

1983-11-17

1985-08-13

Cline, William R.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9044, 123198F, F01L 134

Patent

active

045343233

ABSTRACT:
A valve operation changing system of an internal combustion engine, comprises a rocker arm to operate an intake or exhaust valve, and a control device for axially moving the rocker arm so as to selectively cause the rocker arm to engage with first or second cam in accordance with an engine operating condition. The control device includes an actuator having first and second hydraulic pressure chambers whose pressures move the rocker arm to engage with the first and second cams, respectively. A flow direction changing valve is provided to selectively supply the first or second hydraulic pressure chambers with oil from an oil pressure source, in accordance with the engine operating condition. Additionally, a flow control valve is disposed in an oil passage connecting the flow direction changing valve with the second hydraulic pressure chamber and openable to allow oil flow through the oil passage in accordance with the rotational position of the camshaft cams, thereby precisely regulating rocker arm transferring timing so as not to overlap the lift of the camshaft cams.

REFERENCES:
patent: 3730150 (1973-05-01), Codner, Jr.
patent: 4253434 (1981-03-01), Takizawa et al.
patent: 4354460 (1982-10-01), Mae et al.

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