Cylinder for internal combustion engine and method of treating inner surface of the cylinder
AssigneeKioritz Corporation
InventorsKatsumasa Nozaki, Shinji Tsuchiya, Motoi Hashiba, Hiroshi Fukuda
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Abstract
A cylinder for an internal combustion engine and a method for treating the inner surface of the cylinder, which enables the inner surface constituting a piston-sliding surface of the cylinder to have a high quality plated layer which is uniform in thickness and smooth in surface at low cost without necessitating grinding work such as honing work. The cylinder and the method of the present invention are characterized in that the inner surface of the cylinder is provided with a plated layer which is deposited thereon by a PR (Periodical Reverse) method employing a high-speed polarity reversal power source.
Claims7
A cylinder for an internal combustion engine comprising:
- an inner surface constituting a piston-sliding surface and having formed therein at least one suction port, at least one exhaust port and at least one scavenging port which are designed to be opened and closed by the piston:
- and
- the cylinder is made of an aluminum alloy and said inner piston-sliding surface has a plated layer deposited thereon by a PR (Periodical Reverse) method employing a high-speed polarity reversal power source,
- wherein said plated layer deposited on the inner piston-sliding surface is employed as a piston-sliding surface without being further subjected to grinding work.
A method of treating an inner surface of a cylinder for an internal combustion engine, comprising the step of subjecting the inner surface constituting a piston-sliding surface of the cylinder to plating by means of a PR method employing a high-speed polarity reversal power source, wherein the step of subjecting the inner surface constituting a piston-sliding surface of the cylinder to plating by means of a PR method employing a high-speed polarity reversal power source comprises:
- introducing an anode having a cylindrical configuration into the cylinder;
- and
- at the same time, permitting a plating solution to flow from a plating solution tank to fill said cylinder with the plating solution through said anode and then to flow out of said cylinder to return to said plating solution tank, thereby permitting the plating solution to circulate between said cylinder and said plating solution tank.
Dependencies are inferred from the claim text.