Two-stroke internal combustion engine

Details Two-stroke internal combustion engine Two-stroke internal combustion engine

1983-09-09

1987-06-09

Feinberg, Craig R.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 65P, 123 73PP, 92177, F02B 3304

Patent

active

046712194

ABSTRACT:
A two-cycle internal combustion engine having an oblong cylinder and an oblong piston therein. The engine includes two sets of scavenging ports at either end of the oblong cylinder having at least three ports each. Scavenging passages extending to the scavenging ports may be directed at sequentially increasing angles of inclination to the local normal with the cylinder away from the exhaust porting. In this way, flow may be directed across the piston head away from the exhaust porting and then upwardly to return toward the exhaust porting. A domed piston is also disclosed having discrete guide surfaces on the domed surface of the piston to specifically direct incoming air/fuel mixture upwardly from each of the scavenging ports. An element of the cylinder midway in the long dimension of the cylinder extends in the direction of piston movement without porting so as to provide a smooth wall surface. An oblong piston ring mounted within a groove in the piston has a break in the ring coincide with the unported cylinder element to reduce stress and friction.

REFERENCES:
patent: 1632988 (1927-06-01), Adams
patent: 2190011 (1940-02-01), Boxan
patent: 2760469 (1956-08-01), Kremser
patent: 4174685 (1979-11-01), Meier
patent: 4287860 (1981-09-01), Fujikawa et al.
patent: 4306730 (1981-12-01), Honda et al.
patent: 4329948 (1982-05-01), Fujikawa et al.
patent: 4373474 (1983-02-01), Schindler et al.

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