US 4,359,027 AGranted

Two-cycle internal combustion engine having high swirl combustion chamber

AssigneeOutboard Marine Corporation

InventorOtto H. Scharpf

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Abstract

Disclosed is a two-cycle, internal combustion engine including an engine block, and a cylinder in the engine block having a head and generally opposed inlet and outlet walls respectively including at least one intake port through which a fresh charge is admitted into the cylinder and at least one outlet port through which exhaust gases are exhausted from the cylinder. A piston is mounted for reciprocative movement inside the cylinder between a first position spaced from the cylinder head wherein the intake port is uncovered, a top dead center position, and a third position wherein the piston approaches the top dead center position. The piston has a top, an inlet face portion which periodically covers and uncovers the intake port and an outlet face portion which periodically covers and uncovers the outlet port. The piston and cylinder have a configuration causing increased swirling of the fresh charge in the cylinder as the piston moves from the third position to the top dead center position. The piston and cylinder are constructed so as to form two spaced apart chambers in the cylinder when the piston is in the third position and for causing that portion of the charge in one of the chambers to be forced into the other of the chambers as the piston moves to the top dead center position.

Claims14

Dependent claims

A two-cycle, internal combustion engine comprising an engine block, a cylinder in said engine block having a head and generally opposed inlet and outlet walls respectively including at least one intake port which is spaced axially from said cylinder head and through which a fresh charge is admitted into said cylinder and at least one outlet port which is spaced axially from said cylinder head and through which exhaust gases are exhausted from said cylinder, a piston mounted for reciprocative movement inside said cylinder relative to a top dead center position and a second position wherein said piston approaches said top dead center position, said piston having a top, and a skirt extending from said piston top in the direction away from said cylinder head and including an inlet face portion which periodically covers and uncovers said intake port, said skirt also including an outlet face portion which periodically covers and uncovers said outlet port, and means for causing swirling of the fresh charge in the cylinder as the piston moves from said position to said top dead center position, said means for causing swirling including means on said cylinder head and on said piston top for forming two spaced apart and connected chambers in said cylinder when said piston is in said second position and for substantially reducing the volume of one of said chambers as compared to the volume of the other of said chambers as said piston moves to said top dead center position so as thereby to cause the portion of the charge in said one of said chambers to be forcibly swirled into the other of said chambers.

A two-cycle, internal combustion engine comprising an engine block, a cylinder in said engine block having a head and generally opposed inlet and outlet walls respectively including at least one intake port through which a fresh charge is admitted into said cylinder and at least one outlet port through which exhaust gases are exhausted from said cylinder, a piston mounted for reciprocative movement inside said cylinder relative to a top dead center position and a second position wherein said piston approaches said top dead center position, said piston having a top, and a skirt extending from said piston top in the direction away from said cylinder head and including an inlet face portion which periodically covers and uncovers said intake port, said skirt also including an outlet face portion which periodically covers and uncovers said outlet port, and means for causing swirling of the fresh charge in the cylinder as the piston moves from said second position to said top dead center position, said means for causing swirling including means on said cylinder head and in said piston top for forming two spaced apart and connected chambers in said cylinder when said piston is in said second position and for substantially reducing the volume of one of said chambers as said piston moves to said top dead center position so as thereby to cause the portion of the charge in said one of said chambers to be forcibly swirled into the other of said chambers.

Dependencies are inferred from the claim text.