Two cycle loop scavenging engine having unequal scavenging passa

Details Two cycle loop scavenging engine having unequal scavenging passa Two cycle loop scavenging engine having unequal scavenging passa

1978-04-14

1979-09-11

Myhre, Charles J.

Internal-combustion engines

Two-cycle

Rear compression

123 73R, 123 73AA, 123 73PP, F02B 3304

Patent

active

041671600

ABSTRACT:
A two cycle loop scavenging engine of the crankcase precompression type having a pair of equally dimensioned scavenging passages 14, 16 disposed in a cylinder block 10 behind an apertured cylinder line 12. The passages are symmetrically positioned on opposite sides of a vertical plane A including the cylinder axis and oriented at an angle .theta. to a plane normal to the crankshaft 17. Recessed notches 22, 23 in the lower periphery of the piston skirt 20a mate with notches 12e, 12f, respectively, in the bottom of the cylinder liner at the entrances to scavenging passages 14, 16 at the bottom of each piston stroke. The notches 22, 23 have unequal cross-sectional areas to compensate for unequal fuel mixture pressures at the scavenging passage entrances caused by the rotation of the crankweb 17a, thereby producing a more uniform fuel mixture distribution in the cylinder.

REFERENCES:
patent: 1186299 (1916-06-01), Eighmie
patent: 2189357 (1940-02-01), Cull
patent: 2627255 (1953-02-01), Kiekhaefer
patent: 3257998 (1966-06-01), Brooks
patent: 3379179 (1968-04-01), Mantzel
patent: 4066050 (1978-01-01), Ford-Dann
patent: 4075985 (1978-02-01), Iwai

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