Internal-combustion engines – Two-cycle – Rear compression
Reexamination Certificate
1999-11-02
2001-07-24
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Two-cycle
Rear compression
C123S0650WA
Reexamination Certificate
active
06263841
ABSTRACT:
FIELD OF INVENTION
This invention concerns two stroke piston engines having negligible loss of air plus fuel mixture during the cylinder exhausting and filling processes.
BACKGROUND
Conventional two stroke engines with carburetor fuel systems have a significant loss of air plus fuel mixture into the exhaust system during the cylinder scavenging process. Also, during low torque or part load operation, misfiring occurs. Misfiring causes unburned fuel to enter the exhaust system on the next cycle. Unburned fuel in the exhaust system increases specific fuel consumption and creates environmental pollution. These shortcomings must be overcome to ensure the future of low weight, high power output, relatively simple, and inexpensive two stroke engines.
OBJECTS AND ADVANTAGE
An object of this invention is to provide a method for exhausting and filling the cylinder with fresh charge while incurring negligible loss of air plus fuel mixture into the exhaust system.
Another object is to prevent loss of air plus fuel mixture into the exhaust system without significantly altering the low weight, high power output and low cost of the two stroke engine.
Another object is to improve the specific fuel consumption.
Another object is to increase specific power output.
Another object is to ensure the reliable ignition of the compressed air plus fuel mixture every cycle.
Another object is to significantly reduce exhaust emissions.
Further objects and advantages of my invention will become apparent from a consideration of the drawings and ensuing descriptions.
SUMMARY
Engines of this invention retain the good features of conventional two stroke engines: simple, low cost, low weight, small size, and high power output, without their major shortcomings. Engines of this invention have increased specific power output without large tuned exhaust systems, have reduced specific fuel consumption, and greatly reduced exhaust emissions.
REFERENCES:
patent: 890335 (1908-06-01), Claus
patent: 2844131 (1958-07-01), Beveridge
patent: 4732117 (1988-03-01), Tanahashi et al.
patent: 5081961 (1992-01-01), Paul et al.
Argenbright Tony M.
Harris Katrina B.
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