Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1986-09-02
1987-12-08
Feinberg, Craig R.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
137854, F02B 2506
Patent
active
047112247
ABSTRACT:
A check valve for disposition between a vacuum operated device and the intake of an auxiliary vacuum pump of an automobile which discharges into the crankcase of the engine of the vehicle. The check valve includes an elastomeric umbrella valve having a flexible lip which is self-biased to a closed position preventing backflow of air to the vacuum operated device and which is flexed to a normal open position by a pressure difference corresponding to pump operation with the integrity of the auxiliary vacuum system intact. A larger pressure difference corresponding to operation of the vacuum pump with the integrity of the auxiliary vacuum system breached flexes the lip of the umbrella valve to a control open position wherein airflow is restricted to only a control orifice of the valve the flow area of which orifice is predetermined to limit airflow to less than the rate at which air is scavenged from the crankcase of the engine.
REFERENCES:
patent: 3610273 (1971-10-01), Russell
patent: 4012183 (1977-03-01), Calabretta
patent: 4066055 (1978-01-01), Hager
patent: 4162662 (1979-07-01), Melchior
patent: 4513784 (1985-04-01), Farrand et al.
patent: 4550749 (1985-11-01), Krikorian
patent: 4610275 (1986-09-01), Beecher
Feinberg Craig R.
General Motors Corporation
Macy Marguerite
Schwartz Saul
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