Secondary air supply system for engine unit

Details Secondary air supply system for engine unit Secondary air supply system for engine unit

1991-11-21

1993-03-30

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

F01N 332

Patent

active

051972824

ABSTRACT:
A secondary air supply system of a vehicle, including an engine unit having a crank chamber and being operatively connected to an air cleaner and an exhaust system including an exhaust pipe, comprises a diaphragm pump device provided with an inner chamber and having an air inlet port and an air outlet port both being communicated with the inner chamber, a diaphragm disposed in the inner chamber to divide it into a diaphragm chamber and a pump chamber, a first hose connecting the air inlet port and the air cleaner to introduce a secondary air from the air cleaner into the pump chamber, a second hose connecting the air outlet port and the exhaust pipe to supply the secondary air into the exhaust pipe through the outlet port, and a third hose connecting the diaphragm chamber of the diaphragm pump device and the crack chamber of the engine unit. The secondary air is supplied into the exhaust pipe through the diaphragm pump by an amount in proportion to a magnitude of an oscillation of the diaphragm caused in accordance with a pressure variation in the crank chamber caused in proportion to an engine revolution speed. A valve assembly is further disposed in the pump chamber for allowing the secondary air introduced into the pump chamber to flow uni-directionally from the inlet port to the outlet port.

REFERENCES:
patent: 3106821 (1963-10-01), Ridgway
patent: 3672172 (1972-06-01), Hammond
patent: 4085586 (1978-04-01), Shibata
patent: 4096692 (1978-06-01), Nakamura

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