PURPOSE: To reduce the manufacturing cost of a slide valve by employing a new plating method, in place of hard chromium plating, for plating the surface of the slide valve which is low in cost and provides high abrasion resistance.
CONSTITUTION: A slide valve guide cylinder 3 is installed adjoiningly to an air intake channel 2 piercing through a carburetor body 1. The proposed slide valve 4 is slidably provided inside the slide valve guide cylinder 3 and controls opening/closing of the air intake channel 2. The slide valve 4 is composed of a free cutting metal such as brass, and is coated with a superfine diamond particle film in such a manner that superfine particle diamond is added to nickel and phosphor bath which is suitable for electroless plating, and the superfine particle diamond is eutectically formed in phosphor and nickel which are deposited by electroless plating.
NAKAZATO KENJI
NUMANO HIROSHI
