Two-cycle engine cylinder and method for manufacturing the same
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsTsuneyoshi Yuasa, Masanori Kobayashi
Life of this patent
Estimating the term…
Abstract
A cylinder block for the two-cycle combustion engine includes a scavenging port open at an inner peripheral surface of the cylinder block so as to orient diagonally upwardly relative to a longitudinal axis of a cylinder bore and defined in the cylinder block in communication with a combustion chamber. This scavenging port is formed by cutting with the rotary cutting tool, then rotated about its own longitudinal axis, from an inner peripheral surface of the cylinder block.
Claims4
In a cylinder block for a two-cycle combustion engine including a scavenging port, open at an inner peripheral surface of the cylinder block, and orient diagonally upwardly relative to a longitudinal axis of a cylinder bore and defined in the cylinder lock in communication with a combustion chamber, the improvement comprising:
- an air scavenging passage in the cylinder block;
- a fuel mixture scavenging passage in the cylinder block, wherein the air scavenging passage extends further upward from the fuel mixture scavenging passage in the cylinder block, wherein the air scavenging passage and the fuel mixture scavenging passage communicate with the scavenging port adjacent the inner peripheral surface of the cylinder block;
- and the scavenging port has an open perimeter edge formed on the inner peripheral surface of the cylinder bore including an upper edge section which includes a flat region at an intermediate portion of the upper edge section and respective inclined regions extending diagonally downwardly from opposite sides of the flat region to associated side perimeter edge sections of the scavenging port.
Dependencies are inferred from the claim text.