F - Mech Eng,Light,Heat,Weapons – 02 – B
Patent
F - Mech Eng,Light,Heat,Weapons
02
B
171/18
F02B 75/10 (2006.01) F02B 25/18 (2006.01) F02F 3/28 (2006.01) F02B 75/02 (2006.01)
Patent
CA 1052700
ABSTRACT OF THE DISCLOSURE Disclosed herein is a two-cycle, internal combustion engine including an engine block, a cylinder in the engine block having a head and generally opposed intake 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 mounted for reciprocative movement inside the cylinder and having a top and an inlet face portion which periodically covers and uncovers the intake port during reciprocative movement of the piston, a circum- ferentially extending recess in the piston at the juncture between the top and inlet face portion thereof and having an inner wall which extends in front of a limited portion of the intake port located farthest away from the outlet port such that, as the piston inlet face starts to uncover the intake port, an initial flow of fresh charge flows through only the limited portion of the intake port and is deflected by the recess inner wall towards the cylinder head and along the cylinder intake wall in a direction generally parallel to the longitudinal axis of the cylinder, and a deflector carried on the top of the piston and spaced inwardly from the piston recess for deflecting additional streams of fresh charge flowing through the intake port, during subsequent uncovering thereof by the piston inlet face, toward the cylinder head in a direction generally parallel to the cylinder axis but inwardly from the initial stream of fresh charge so that the cylinder is progressively filled with fresh charge from the cylinder inlet wall towards the cylinder outlet wall. In one embodiment the engine includes a plurality of circumferentially spaced intake ports, the piston recess extends in front of only one or more of the centrally located intake ports, and the deflector includes a front face which is located on the intake side of the piston, which extends transversely across the piston in front of the intake port generally parallel to a diametric medial plane between the intake and outlet sides of the piston and which extends from the top of the piston substantially parallel to the longitudinal axis of the cylinder. The deflector face includes opposed end portions each including an end part which extends to adjacent the cylinder wall and which is spaced inwardly from respective of the end inlet ports at a distance to prevent choicing of the incom- ing fresh charge flowing therethrough and a central portion which is spaced farther away from the medial plane that the end parts of the end portions, which extending front of the centrally located intake port or ports, and which is spaced inwardly from the centrally located port or ports at a distance to prevent choking of incoming fresh charge flowing therethrough.
269738
Rose Edgar
Wlezien Richard A.
LandOfFree
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