Internal-combustion engines – Two-cycle – Combined pump and motor cylinder
Patent
1978-12-11
1980-06-10
Burns, Wendell E.
Internal-combustion engines
Two-cycle
Combined pump and motor cylinder
123 47R, 123 65VB, 123 68, 123 71R, F02B 3304
Patent
active
042067278
ABSTRACT:
The invention provides a two-stroke-cycle engine which has a main piston, and an auxiliary piston and transfer valve arrangement. and its associated drive mechanism. The engine has also at least two intake valves arranged in the cylinder head. The auxiliary piston and transfer valve assembly comprises an auxiliary piston having an external hollow stem linearly slidable in a bushing mounted in said cylinder head and the transfer valve is provided with a stem freely slidable within said hollow stem. The drive mechanism operates the auxiliary piston to suck-in a new charge of combustible mixture into the cylinder space between the auxiliary piston and the cylinder head during the first or downward stroke of the main piston, and simultaneously aiding the discharge of the burned gases from the previous cycle through the exhaust port with the transfer valve in its closed position, after which the intake valves close and the fresh combustible charge in said cylinder space is compressed during a first portion of the second or upward stroke of the main piston, whereafter the transfer valve opens during the last portion of the cycle allowing the transfer of the combustible mixture from said upper cylinder space to the space comprised between the auxiliary and the main pistons.
REFERENCES:
patent: 779116 (1905-01-01), Bronder
patent: 961677 (1910-06-01), Bradley
patent: 990082 (1911-04-01), Traub
patent: 1178691 (1916-04-01), Tarington
patent: 1257360 (1918-02-01), Jones
patent: 1616064 (1927-02-01), Purdy
patent: 1726073 (1929-08-01), Kinder
patent: 1740040 (1929-12-01), Sapienza
patent: 1891510 (1932-12-01), Tucker
patent: 2445148 (1948-07-01), Minnix
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