Invention Grant
- Patent Title: Piston for internal combustion engine and piston surface treatment method
- Patent Title (中): 活塞内燃机和活塞表面处理方法
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Application No.: US13469310Application Date: 2012-05-11
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Publication No.: US08789509B2Publication Date: 2014-07-29
- Inventor: Masato Sasaki
- Applicant: Masato Sasaki
- Applicant Address: JP Hitachinaka-shi
- Assignee: Hitachi Automotive Systems, Ltd.
- Current Assignee: Hitachi Automotive Systems, Ltd.
- Current Assignee Address: JP Hitachinaka-shi
- Agency: Crowell & Moring LLP
- Priority: JP2009-063764 20090317
- Main IPC: F16J1/04
- IPC: F16J1/04

Abstract:
A piston for an internal combustion engine includes a piston base material and a film of lubrication coating composition. The coating composition has an inner coating layer formed on a surface of the piston base material and an outer coating layer formed on a surface of the inner coating layer. Each of the inner coating layer and the outer coating layer contains at least one of a polyamide-imide resin, a polyimide resin and an epoxy resin as a binder. The inner coating layer contains 0 to 50 wt % of at least one of graphite and molybdenum disulfide as a solid lubricant, whereas the outer coating layer contains 50 to 95 wt % of at least one of graphite and molybdenum disulfide as a solid lubricant.
Public/Granted literature
- US20120222646A1 Piston for Internal Combustion Engine and Piston Surface Treatment Method Public/Granted day:2012-09-06
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