F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/27
F02M 35/02 (2006.01) B01D 46/24 (2006.01) B01D 46/52 (2006.01) B01D 51/00 (2006.01) F02M 25/08 (2006.01) F02M 35/04 (2006.01)
Patent
CA 1141612
ABSTRACT OF THE DISCLOSURE An air filter for filtering combustion air for an internal combustion engine includes a housing holding a filter element and an inlet snorkel tube connected to the housing. A "trap door" valve mechanism is located in the snorkel tube and includes a valve seat mounted on a support which circumscribes the inner wall of the snorkel tube and a valve element pivotally mounted on the support which is yieldably urged into sealing engagement with the valve seat when the engine is turned off. The valve mechanism presents a surface sub- stantially transverse to the direction of air flow through the snorkel tube, so that combustion air communicated through the snorkel tube when the engine is running acts against the transverse surface urging the valve element to an opened position. The valve element is "cracked open" by a solenoid when the engine is to be started in order to permit initial air flow through the air cleaner to facilitate starting. Accordingly, when the vehicle engine is turned off, the valve element closes, thereby preventing the escape of gasoline vapors to the ambient atmosphere. The filter element inside the air cleaner housing includes a charcoal impregnated pleated paper element in series with the conventional pleated paper filter element. The charcoal impregnated element adsorbs the vapors trapped in the housing by closure of the valve mechanism when the engine is turned off, The charcoal impregnated paper is purged by the normal air flow through the air cleaner when the engine is started again.
354803
Belore Kevin L.
Kho Tiong H.
Canadian Fram Limited
Macrae & Co.
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