Idle fuel residual storage system
AssigneeBrunswick Corporation
InventorJames M. Hundertmark
Life of this patent
Estimating the term…
Abstract
In a two cycle internal combustion engine (2) wherein heavy fuel ends accumulate in lower portions of the crankcase (8), recirculation means (36, 38) are provided for variably recirculating the heavy fuel ends back into the crankcase only at higher engine speeds for subsequent combustion. The heavy fuel ends are collected in a reservoir (36), and held therein at idle, to minimize engine smoke. The heavy fuel ends are released from the reservoir at higher engine speed for recirculation through a delivery line (40) which is selectively exposed by a throttle valve (24) to crankcase vacuum only at higher engine speed, whereby the heavy fuel ends are sucked from the reservoir through the delivery line and carburetor throat (26) into the crankcase.
Claims10
In a two cycle internal combustion engine comprising:
- a piston reciprocal in a cylinder between a crankcase and a combustion chamber;
- means for supplying fuel to said crankcase;
- fuel-air transfer passage means between said crankcase and said combustion chamber;
- said piston having a charging stroke in one direction compressing fuel-air mixture in said combustion chamber and creating a vacuum in said crankcase, and having a power stroke upon combustion of said mixture driving said piston in the opposite direction pressurizing said crankcase and forcing fuel-air mixture to flow from said crankcase through said transfer passage means to said combustion chamber for repetition of the cycle, and wherein heavy fuel ends accumulate in said crankcase;
- the improvement comprising:
- reservoir means connected to said crankcase for receiving said heavy fuel ends, said power stroke of said piston pumping said heavy fuel ends into said reservoir means;
- and
- means responsive to engine speed for recirculating said heavy fuel ends back to said crankcase at high engine speed, and means blocking said recirculation at idle to minimize engine smoke.
In a two cycle internal combustion engine having a piston reciprocal in a cylinder between a crankcase and a combustion chamber and accumulating heavy fuel ends at low portions in said combustion chamber, the improvement comprising engine speed responsive recirculation means for recirculating said heavy fuel ends from said low portions back into said crankcase at high engine speed and means for blocking said recirculation at low engine speed below a given value to minimize engine smoke.
In a two cycle internal combustion engine comprising:
- a piston reciprocal in a cylinder between a crankcase and a combustion chamber;
- means for supplying fuel to said crankcase;
- fuel-air transfer passage means between said crankcase and said combustion chamber;
- said piston having a charging stroke in one direction compressing fuel-air mixture in said combustion chamber and creating a vacuum in said crankcase, and having a power stroke upon combustion of said mixture driving said piston in the opposite direction pressurizing said crankcase and forcing fuel-air mixture to flow from said crankcase through said transfer passage means to said combustion chamber for repetition of the cycle, and wherein heavy fuel ends accumulate in said crankcase;
- the improvement comprising:
- reservoir means connected to said crankcase for receiving said heavy fuel ends, said power stroke of said piston pumping said heavy fuel ends into said reservoir means;
- and
- means responsive to engine speed for recirculating said heavy fuel ends back to said crankcase at high engine speed, and preventing said recirculation at idle to minimize engine smoke;
- wherein said means responsive to engine speed comprises means connected between said reservoir means and said fuel supply means;
- wherein said fuel supply means comprises a carburetor throat with a throttle valve controlling engine speed between idle when said throttle valve is closed and higher speeds as said throttle valve is opened, and comprising delivery line means connected from said reservoir means to said carburetor throat upstream of said throttle valve in said closed position such that at idle said throttle valve blocks said delivery line from application of crankcase vacuum during said charging stroke, opening of said throttle valve exposing said delivery line to crankcase vacuum whereby said heavy fuel ends are sucked from said reservoir means through said delivery lines means and said carburetor throat into said crankcase at higher engine speed.
Dependencies are inferred from the claim text.