Patent ID: 9322473
Filing Date: 2016-04-26
CPC Classification: B23P,F02F,F05C,F16J,Y10T

Claim Text:
1. A method of producing a piston of an internal combustion engine, the piston having a skirt portion on which inner and outer solid lubricant films are formed as a double layer solid lubricant film, the outer solid lubricant film having a wear resistance lower than that of the inner solid lubricant film, the method comprising: producing a naked piston having the skirt portion; forming the skirt portion with streaks; applying the skirt portion of the naked piston with a first film forming paint which is provided for producing the inner solid lubricant film; heating the first film forming paint on the skirt portion at a temperature of 60° C. to 160° C. for a time less than 800 seconds to dry the same; applying an outer surface of the dried first film forming paint with a second film forming paint which is provided for producing the outer solid lubricant film; and heating the first and second film forming paints on the skirt portion at a temperature of 160° C. to 240° C. for a time of 15 minutes to 180 minutes.