Four-stroke-cycle engine

Details Four-stroke-cycle engine Four-stroke-cycle engine

1995-11-15

1996-12-10

Okonsky, David A.

Internal-combustion engines

Lubricators

Crankcase, pressure control

123572, F01M 1300

Patent

active

055821456

ABSTRACT:
Air is drawn into the crank chamber when the negative pressure is built up in the crank chamber, and the air mixed with the blowby drawn into the crank chamber is led as the secondary air to the exhaust gas discharge section when the positive pressure is built up in the crank chamber. Thus the secondary air is mixed with the exhaust gases discharged from the combustion chamber, and the mixture of the exhaust gases and the secondary air is burned again (oxidized) in the exhaust gas cleaning section, thereby cleaning up the exhaust gases. Furthermore, the present invention is provided with two valves for checking the back flow of the air while maintaining the air flow from the crank chamber to the exhaust gas discharge section. One valve (first valve) is disposed within the intake passage and opens when the negative pressure is built up in the crank chamber. The other valve (second valve) is disposed within the guide passage and opens when the positive pressure is built up in the crank chamber.

REFERENCES:
patent: 4493295 (1985-01-01), Ampferer
patent: 4969434 (1990-11-01), Nakagawa
patent: 5193500 (1993-03-01), Haft
patent: 5279269 (1994-01-01), Aizawa et al.

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