Crankcase compression type two-cycle engine

Details Crankcase compression type two-cycle engine Crankcase compression type two-cycle engine

1995-09-21

1996-12-24

McMahon, Marguerite

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 73AB, 123 73BA, F02B 2504, F02B 2900

Patent

active

055865232

ABSTRACT:
The present invention provides a crankcase compression type two-cycle engine which has a comparatively simple construction, is capable of operating at a low fuel consumption and discharges an exhaust gas having a comparatively low hydrocarbon concentration. The engine comprises a crankcase, a piston, a cylinder joined to the crankcase and provided in its lower part with an exhaust port which is opened and closed by the piston, a cylinder head attached to the upper end of the cylinder, and forming a combustion chamber together with the cylinder and the piston. A poppet scavenging valve is provided in the upper part of the cylinder so as to be opened to the combustion chamber side. A diaphragm actuator operates the poppet scavenging valve using the pressure within the crankcase. The diaphragm actuator is provided with a diaphragm that receives the pressure within the crankcase on one side thereof and receives the pressure of a spring on the other side thereof. Further, a passage for introducing the pressure within the crankcase into the diaphragm actuator is connected to a scavenging passage. A fuel supply system may be connected to the scavenging passage to supply the fuel into the scavenging passage.

REFERENCES:
patent: 1759187 (1930-05-01), Davidson
patent: 1762214 (1930-06-01), Cartwright
patent: 2256437 (1941-09-01), Kylen
patent: 3687118 (1972-08-01), Nomura
patent: 4538569 (1985-09-01), Sugino et al.
patent: 5005537 (1991-04-01), Maissant
patent: 5031594 (1991-07-01), Morikawa
patent: 5062396 (1991-11-01), Duret et al.
patent: 5103780 (1992-04-01), Ishii
patent: 5247914 (1993-09-01), Imai et al.
patent: 5284118 (1994-02-01), Kato et al.

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