Two-state internal combustion engine

Details Two-state internal combustion engine Two-state internal combustion engine

1993-06-03

1994-02-08

Cross, E. Rollins

Internal-combustion engines

Two-cycle

Rear compression

123 73PP, F02M 6910, F02B 2514, F02B 3300

Patent

active

052841111

ABSTRACT:
The invention is directed to a two-stroke internal combustion engine for handheld portable tools such as a motor-driven chain saw with the engine having a piston guided in a cylinder. The base of the piston is rotationally symmetrical and delimits a combustion chamber. An injection valve is mounted in the cylinder wall opposite an exhaust opening for exhaust gases. The injection valve injects fuel toward the piston base at an angle of less than 90.degree.. At least one overflow opening is arranged in the cylinder wall between the exhaust opening and the injection valve. Combustion air flows in through the overflow opening with the downward movement of the piston. The injection jet is directed opposite to the flow direction of the entering combustion air. The injection jet is directed for the most part to the half of the piston base which is disposed away from the exhaust opening and the injection opening is the last opening to be closed by the piston travelling toward top dead center. The duration of injection is continued beyond the closure of the overflow opening and of the exhaust outlet. In this way, an optimal air/fuel mixture is assured even at high rotational speeds.

REFERENCES:
patent: 2699765 (1955-01-01), Taylor
patent: 4286553 (1981-09-01), Baltz et al.
patent: 4790270 (1988-12-01), McKay et al.
patent: 5213069 (1993-05-01), Curtil
patent: 5237966 (1993-08-01), Katoh et al.

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