Two-stroke cycle gasoline engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsMasaaki Noguchi, Yukiyasu Tanaka, Isao Igarashi
Life of this patent
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Abstract
A two-stroke cycle gasoline engine including at least one two-stroke cycle power cylinder-piston assembly adopting uniflow scavenging and incorporating two horizontally opposed pistons, and at least one scavenging pump cylinder-piston assembly of the reciprocating type with or without having crankcase compression, wherein the total stroke volume of the scavenging pump means is 1.35 to 1.85 times as large as that of the power cylinder-piston assembly, and the operational phase of the pump cylinder-piston assembly is shifted from that of the power cylinder-piston assembly by an angle of 180.degree. or a little more.
Claims7
A two-stroke cycle gasoline engine, comprising:
- (a) at least one two-stroke cycle power cylinder-piston assembly incorporating uniflow scavenging and two horizontally opposed pistons;
- (b) a pair of crankcases and crank mechanisms housed in said crankcases operatively associated with said power cylinder-piston assembly;
- (c) a scavenging pump means including:
- (1) at least one pump cylinder-piston assembly of the reciprocating type driven by said power cylinder-piston assembly in synchronization therewith;
- and
- (2) reciprocating piston pump structures including said crankcases and crank mechanisms;
- (d) a carburetor;
- (e) first passage means for supplying fuel-air mixture from said carburetor individually to said pump cylinder-piston assembly and to said pair of crankcases;
- (f) second passage means for supplying fuel-air mixture from said pump cylinder-piston assembly to said pair of crankcases;
- and
- (g) third passage means for supplying fuel-air mixture from said pair of crankcases to said power cylinder-piston assembly,
- wherein the total stroke volume of said scavenging pump means is between 1.35 and 1.85 times as large as that of said power cylinder-piston assembly, and the operational phase of said pump cylinder-piston assembly is so shifted relative to that of the power cylinder-piston assembly to which it supplies scavenging mixture, that when the power cylinder piston assembly is at its bottom dead center the pump cylinder-piston assembly is in a range between its top dead center and a phase point which is slightly before the top dead center.
Dependencies are inferred from the claim text.