Two-cycle engine
AssigneeHusqvarna Zenoah Co., Ltd.
InventorsTakashi Ooniwa, Hideo Koizumi
Life of this patent
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Abstract
A two-cycle engine includes a starting fuel supply passage for supplying a starting fuel to a crankcase from a starting fuel reservoir, and a flow passage opening and closing unit provided in a midway portion of the starting fuel supply passage. The starting fuel supply passage is opened to be constantly in communication with the crankcase. Accordingly, simultaneously with the generation of a negative pressure within the crankcase when a piston starts to ascend from a bottom dead center, the starting fuel starts to be supplied to the crankcase. Since the starting fuel is supplied to the crankcase for a relatively long time as compared to a conventional engine, a sufficient amount of the fuel is supplied for starting and startability of the two-cycle engine is improved.
Claims4
A two-cycle engine, comprising:
- a cylinder;
- a crankcase provided adjacent to the cylinder;
- an intake passage for feeding an air-fuel mixture into the crankcase;
- a starting fuel supply passage for supplying a starting fuel to the crankcase from a starting fuel reservoir;
- and
- a flow passage opening and closing unit provided in a midway portion of the starting fuel supply passage,
- wherein the starting fuel supply passage includes a cylinder starting fuel supply passage which is provided below the intake passage and which is apertured in a groove-shaped portion formed on an inner circumference of the cylinder, and
- wherein the starting fuel supply passage is opened to be constantly in communication with the crankcase.
Dependencies are inferred from the claim text.