Valve timing control for internal combustion engines

Details Valve timing control for internal combustion engines Valve timing control for internal combustion engines

1984-07-25

1985-11-12

Lazarus, Ira S.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

Air or combustible mixture entering the combustion chamber...

123 9017, 123308, F01L 134, F02B 3102

Patent

active

045521123

ABSTRACT:
An engine intake system includes a combustion chamber, a first intake port opening to the combustion chamber, and a second intake port opening to the combustion chamber. A shut-off valve is provided for blocking intake gas flow to the combustion chamber through the second intake port in a first engine operating region wherein engine load is relatively small, and allowing the intake gas to flow to the combustion chamber through the second intake port in a second engine operating region wherein the engine load is relatively large. A first valve actuating mechanism is provided for opening the first intake valve at a first timing, and a second valve actuating mechanism is provided for opening the second intake valve at a second timing. A valve timing changing device is provided for changing the first timing with respect to the second timing so that the first intake valve is closed later than the second intake valve in the second engine operating region, and so that the first intake valve is closed at least in a certain engine operating zone in the first engine operating region at a timing which is more advanced than the timing at which the first intake valve is closed in the second engine operating region.

REFERENCES:
patent: 2260983 (1941-10-01), Walker
patent: 3422803 (1969-01-01), Stivender
patent: 4285310 (1981-08-01), Takizawa et al.
patent: 4347812 (1982-09-01), Kosuda et al.
patent: 4442806 (1984-04-01), Matsuura et al.
patent: 4480617 (1984-11-01), Nakano et al.

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