Two-stroke I.C. engines

Details Two-stroke I.C. engines Two-stroke I.C. engines

1975-12-18

1978-01-03

Lazarus, Ronald H.

Internal-combustion engines

Two-cycle

Rear compression

123 73A, 123 73PP, F02B 3304

Patent

active

040660508

ABSTRACT:
A two-stroke internal combustion engine has a plurality of transfer ports controlled by the movement of the piston, the transfer ports being at the ends of passages each extending from the interior of the crankcase through the cylinder wall so as to place the crankcase interior in communication with the upper working space in the cylinder above the piston when its associated transfer port is uncovered by downward movement of the piston. Some, but not all, of the transfer port passages are provided with pressure-responsive non-return valves which are lightly spring-biassed towards closed positions in which they restrict the gas flow through those passages, in the direction towards the upper working space in the cylinder, causing the gas flow from the crankcase to travel at increased velocities through the remaining transfer port passage or passages. When the pressure differential between the crankcase interior and the upper part of the cylinder exceeds a predetermined minimum value the non-return valves open to permit bulk gas flow through their associated transfer port passages and their associated ports.

REFERENCES:
patent: 2058526 (1936-10-01), Tanner
patent: 3195524 (1965-07-01), Heidner
patent: 3613646 (1971-10-01), Hisada
patent: 3815558 (1974-06-01), Tenney

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