Method of producing piston of internal combustion engine
AssigneeHitachi Automotive Systems, Ltd.
InventorMasato Sasaki
Life of this patent
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Abstract
A method of producing a piston includes a step of producing a naked piston having the skirt portion; a step of forming the skirt portion with streaks; a step of applying a skirt portion of the naked piston with a first film forming paint which is provided for producing the inner solid lubricant film; a step of 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; a step of 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 a step of 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.
Claims9
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.
A method of producing a piston of an internal combustion engine, the piston having a double layer solid lubricant film formed on a skirt portion thereof, the method comprising:
- producing a naked piston having the skirt portion;
- applying an outer surface of the skirt portion with a first film forming paint which is provided for producing an inner solid lubricant film;
- heating the first film forming paint at a first temperature to cause the first film forming paint to be damp-dried with some organic solvent left therein;
- applying an outer surface of the damp-dried first film forming paint with a second film forming paint which is provided for producing an outer solid lubricant film;
- and
- firing the first and second film forming paints at a second temperature that is higher than the first temperature.
Dependencies are inferred from the claim text.