Crankcase supercharged four cycle engine with jet pump assist

Details Crankcase supercharged four cycle engine with jet pump assist Crankcase supercharged four cycle engine with jet pump assist

1982-12-22

1984-07-24

Burns, Wendell E.

Internal-combustion engines

Four-cycle

Crankcase compression of air or combustible mixture to be...

123318, F02B 3306

Patent

active

044612516

ABSTRACT:
A crankcase supercharged four cycle engine (10) includes an outside air inlet port (22) positioned so that upon each expansion stroke of the piston (11) a charge of pressurized air is fed to the crankcase (15), and hence through a one-way valve (25) and nozzle (26) into an enclosed surge tank (28). A tuning pipe (30) disposed within the surge tank has an inlet (31) at the nozzle outlet and provides a tuned passage which connects for discharge through a valved port (20, 21) into the engine cylinder (12). On one downward stroke of the piston, air from the outside air inlet port is compressed into the crankcase and is forced through the one-way valve and nozzle to provide a charge of compressed air which is trapped within the surge tank and tuning pipe. On the next downward stroke of the piston, another charge of compressed air is forced through the nozzle and into the tuning pipe inlet. A venturi effect is created which draws the previous charge of air trapped in the surge tank into the tuning pipe, which increases the pressure within the tuning pipe for discharge through the valved port into the engine cylinder.

REFERENCES:
patent: 931976 (1909-08-01), Turner
patent: 1981610 (1934-11-01), Bucklin
patent: 3257996 (1966-06-01), Henrikson
Article entitled "Webra T4 Four Cycle", pp. 32, 33, 34, 90, 91, of May, 1981, issue of Model Airplane News.
Article entitled "Improvement of Volumetric Efficiency of 4-Stroke Cycle Engine by Crankcase Supercharging", by Dr. Watanabe.

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