Scavenge valve for a two-cycle engine

Details Scavenge valve for a two-cycle engine Scavenge valve for a two-cycle engine

1987-04-27

1988-11-15

Rivell, John

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 43, 251 33, 123 65VC, F16K 3140

Patent

active

047843675

ABSTRACT:
A method and system, including a valve (32) for controlling the amount of fluid purged from a cylinder (12) of a two-cycle engine prior to the combustion of an air-fuel mixture within the cylinder especially during low demand periods of engine operation. The system including a throttle (26) disposed upstream of an inlet port (14) and controlled to be maintained in an open condition during such intervals. The valve (32), which is adapted to communicate with a scavenge port (30) includes a piston (80) that is movable relative to an aperture (76) in response to a pressure differential created in part by the operation of a cooperating electromagnetic valve (54), such that when the piston is moved to uncover the aperture a predeterminable amount of fluid within the cylinder can be purged therefrom as the cylinder piston is moved through its compression cycle.

REFERENCES:
patent: 1136715 (1915-04-01), Pitts
patent: 1181793 (1916-05-01), Radovanovic
patent: 1665832 (1928-04-01), Wright
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patent: 2048223 (1936-07-01), Scott
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patent: 2431563 (1947-11-01), Johansson
patent: 2466375 (1949-04-01), Carbon
patent: 2991616 (1961-07-01), Miller
patent: 3265303 (1966-08-01), Harris
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patent: 3680305 (1972-08-01), Miller
patent: 3815566 (1974-07-01), Staggs
patent: 3860073 (1975-01-01), Willms

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