Performance improvement design for two-stroke engines

Details Performance improvement design for two-stroke engines Performance improvement design for two-stroke engines

1993-09-14

1995-06-20

Yuen, Henry C.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

123 65P, F01P 104

Patent

active

054253462

ABSTRACT:
A two stroke engine having a variable inlet port timing device in conjunction with a piston port controlled timing apparatus for filling the top of transfer passages, that connect the crankcase chamber to the combustion chamber of the engine, with buffer gas such as exhaust gas or secondary air for the reduction of pollutants, improvement of performance, and delivery ratio of an internal combustion two-stroke engine and the like. Piston port controlled timing is provided by buffer air passages having a movable portion with inlet and outlet ports disposed through the piston. In another embodiment piston controlled selective exhaust gas recirculation is provided and a rotary valve in the exhaust gas recirculation passage is fitted to improve the performance of the engine. The pressure in the crankcase may be controlled by a rotary valve comprises a pair of rotary disc plates.

REFERENCES:
patent: 4341188 (1982-07-01), Nerstrom
patent: 4516540 (1985-05-01), Nerstrom
patent: 4550696 (1985-11-01), Ehrlich
patent: 4693225 (1987-09-01), Abe et al.
patent: 4693226 (1987-09-01), Choma
patent: 4735186 (1988-04-01), Parsons
patent: 4995354 (1991-02-01), Morikawa
patent: 5121719 (1992-06-01), Okazaki et al.
patent: 5285752 (1994-02-01), Reed et al.

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