Pressure-vacuum aided valve

Details Pressure-vacuum aided valve Pressure-vacuum aided valve

1985-01-09

1986-05-20

Cuchlinski, Jr., William A.

Internal-combustion engines

Cooling

Automatic coolant flow control

123 4108, 123 4113, F01P 714

Patent

active

045893780

ABSTRACT:
In a two cycle internal combustion engine having a water cooling system with a water valve (4) spring biased (64) to a normally closed condition and opened by water pressure in the engine block (14) to permit passage of water out of the block to a radiator or the like for increased cooling, an improvement is provided for keeping the water valve closed at idle without increased spring pressure such that the water valve remains closed at idle, notwithstanding block pressure, and thus enables the engine to warm up, and such that the water valve opens at higher engine speeds to afford proper cooling and prevent abnormally high water pressure in the block which would otherwise be caused by increased spring pressure. Engine crankcase pressure (6) is continually provided (24) to the valve to aid spring biased closing thereof. Engine manifold vacuum (16) is supplied (28) selectively through a throttle controlled valve (30) to vent and relieve crankcase pressure at the valve and to aid opening of the valve against the spring.

REFERENCES:
patent: 2478489 (1949-08-01), Kelson, Sr.
patent: 3521610 (1970-07-01), Coudriet
patent: 4082068 (1978-04-01), Hale
patent: 4457727 (1984-07-01), Flaig
Johnson 275 3.6GT VRO Brochure, 1984.

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