Starting apparatus for two cycle engine
OwnerRichard C. Heidnerinventor
Life of this patent
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Abstract
A two stroke cycle internal combustion engine having a closed crankcase adapted to receive a air-fuel mixture and a cylinder extending from said crankcase, a piston reciprocally movable in said cylinder which alternately produces a low pressure condition in said crankcase as it approaches top dead center and a high pressure condition in said cylinder as it approaches bottom dead center, a fuel reservoir for supplying liquid fuel to the air fuel mixture in said crankcase, a bypass passage connecting said crankcase to said cylinder, and a conduit connecting said crankcase to the fuel reservoir for pumping fuel accumulated in said crankcase during starting into said reservoir, and a unidirectional flow control device in said conduit for preventing return flow from said reservoir to said crankcase.
Claims16
In an internal combustion engine including a generally closed crankcase adapted to receive a combustion air-fuel mixture from a carburetor during a condition of low pressure,
- a cylinder extending from said crankcase,
- a piston reciprocally movable in said cylinder, whereby there is alternately developed in said crankcase a low pressure condition as said piston approaches top dead center and a high pressure condition as said piston approaches bottom dead center,
- a fuel reservoir remote from the carburetor for supplying liquid fuel to the carburetor to provide a combustible air-fuel mixture to the crankcase, and
- a bypass passage extending from said crankcase to said cylinder to permit entry of said mixture into said cylinder as said piston approaches bottom dead center.
- the improvement comprising means for pumping the excess liquids accumulated in said crankcase during cranking of the engine into said remote fuel reservoir,
- said means including a conduit connecting the crankcase to a point above the normal level of fuel in said remote fuel reservoir, whereby the excess accumulated liquids are pumped into said remote fuel reservoir during cranking at a point above the normal level of the fuel in said remote reservoir.
An internal combustion engine including a generally closed crankcase having a cylinder therein and a piston reciprocally movable in said cylinder,
- a bypass passage extending from the crankcase to the cylinder to permit entry of a combustible air-fuel mixture into said cylinder when said piston approaches bottom dead center,
- a carburetor connected to said crankcase,
- a remote fuel reservoir connected to said carburetor and conduit means connecting said crankcase to said remote fuel reservoir for delivering excess fuel accumulated in said crankcase during priming of the engine to said remote fuel reservoir when said piston is moved toward bottom dead center,
- said conduit means being connected to said remote fuel reservoir above the normal level of fuel in said remote fuel reservoir.
A method of starting a rear compression two-cycle engine of the type having a piston reciprocally movable in a cylinder in the crankcase of an engine, a carburetor, and a fuel reservoir,
- said method including the steps of providing the air-fuel mixture in the crankcase with an overabundance of fuel,
- reciprocating said piston in said cylinder to pump the fuel rich air fuel mixture into said cylinder,
- accumulating liquid fuel in a sump in said crankcase,
- said pumping the accumulated fuel in said sump back to the remote fuel reservoir at a point above the normal level of fuel in the remote fuel reservoir during reciprocation of the piston.
Dependencies are inferred from the claim text.