Exhaust arrangement for a 2-cycle engine
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsKazuhisa Kuroshita, Shinji Shuto
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Abstract
An exhaust port is formed in the wall of a cylinder of a 2-cycle engine. At least one of the portions of the cylinder wall which define two vertically opposing edges of the exhaust port is projected at the circumferentially mid portion towards the opposing edge so as to provide a piston guide surface which conforms with the inner peripheral surface of the cylinder and which extends in such a manner as to reduce the axial height of the exhaust port. The piston guide surface serves to suppress vibration and noise caused when an upwardly moving piston falls into the exhaust port.
Claims12
An exhaust arrangement for a 2-cycle internal combustion engine comprising:
- a cylinder having an axial direction and a circumferential direction and a cylinder wall and an open end for receiving a piston;
- and
- an exhaust port formed in the cylinder wall and having first and second opposing edges spaced in the axial direction of the cylinder and having a first projecting portion projecting from the first edge towards the second edge and away from the open end to locally reduce the height of the exhaust port in the axial direction and form a first piston guide surface.
An exhaust arrangement according to claim 8 including a second projecting portion projecting from the second edge towards the first edge to form a second piston guide surface opposing the first piston guide surface and having the same shape as the first piston guide surface.
Dependencies are inferred from the claim text.