Two-stroke engine piston bowl configurations

Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston

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Details

123276, 123305, F02B 1700

Patent

active

061584096

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates generally to two-stroke internal combustion engines and, more particularly, to piston face bowl configurations adapted to improve engine operation.
The invention also involves, in relation to the configuration of the piston face bowl, fuel injector and spark plug location.
Shown in FIG. 1 is a prior construction wherein a fuel injector or nozzle 1 is operative to direct a spray of fuel along the cylinder axis 2 and toward a bowl 3 in a piston face 4, which spray was reflected back by the bowl 3 in the direction toward the fuel injector or nozzle 1 in closely adjacent relation to the spray directed from the fuel injector or nozzle 1.


SUMMARY OF THE INVENTION

The invention provides improved piston bowl constructions for direct injected two-cycle engines. These constructions have various advantages, as explained below.
The invention provides a piston comprising a cylindrical skirt having an axis and an outer periphery, and a piston face extending from the outer periphery and having therein a bowl defined by an upstanding wall extending about an axis extending in inclined relation to the axis of the skirt.
The invention also provides an engine comprising an engine block including a cylindrical wall extending about an axis and defining an engine cylinder, a cylinder head fixed to the engine block, closing one end of the cylindrical wall, and including a recess registering with the engine cylinder, and a piston moveable axially in the engine cylinder and comprising a cylindrical skirt coaxial with the axis of the cylindrical wall and including an outer periphery, and a piston face extending from the outer periphery, defining with the cylinder head and with the cylindrical wall a combustion chamber, and having therein a bowl defined by a cylindrical wall extending about an axis extending in inclined relation to the axis of the cylindrical wall.
The invention also provides an engine comprising an engine block including a cylindrical wall extending about an axis and defining an engine cylinder, a cylinder head fixed to the engine block, closing one end of the cylindrical wall, and including a recess registering with the engine cylinder, a piston moveable axially in the engine cylinder and comprising a cylindrical skirt coaxial with the axis of the cylindrical wall and including an outer periphery, and a dome-shaped piston face extending from the outer periphery, defining with the cylinder head and with the cylindrical wall a combustion chamber, and having therein a bowl located with the cylinder axis passing therethrough, defined by a cylindrical wall extending about an axis extending in inclined relation to the axis of the cylindrical wall, and including a bottom wall extending perpendicularly to the bowl axis, a fuel injector nozzle mounted adjacent the recess of the cylinder head along an axis in inclined relation to the cylinder axis, in spaced relation to the cylinder axis, and adapted to direct a spray of fuel toward the bowl in the piston face for reflection thereby, and a spark plug mounted adjacent the recess of the cylinder head along an axis in inclined relation to the cylinder axis, in spaced relation to the cylinder axis, on the opposite side of the cylinder axis from the fuel injector, and in the path of fuel reflected from the bowl.
The invention also provides a piston for a fuel-injected engine, the piston comprising a piston face having therein a bowl shaped such that substantially all of the fuel striking the piston is directed to the side of the combustion chamber on which the spark plug is located.
The invention also provides a piston for a fuel-injected engine, the piston comprising a piston face having therein a large bowl, the large bowl having therein a small bowl.
The invention also provides a piston for a fuel-injected engine, the piston comprising a piston face having therein a bowl defined in part by a bottom wall having a central peak.
The invention also provides a piston for a fuel-injected engine, the piston comprising a piston fac

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