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1. (WO2018185847) PISTON

Pub. No.:    WO/2018/185847    International Application No.:    PCT/JP2017/014124
Publication Date: Fri Oct 12 01:59:59 CEST 2018 International Filing Date: Wed Apr 05 01:59:59 CEST 2017
IPC: F02F 3/10
F02B 23/10
F02F 3/14
Applicants: NISSAN MOTOR CO., LTD.
Inventors: SUZUKI, Takuma
鈴木 琢磨
馬渕 豊
鈴木 ゆか
The present invention is a piston for an internal combustion engine, wherein a recessed part for holding an air intake swirling flow is formed in a crown surface of the piston. The crown surface is provided with: a heat insulating film formation part having a heat insulating film which has a thermal conductivity lower than that of a base material of the piston, and also has a thermal capacity per unit volume lower than that of the base material of the piston; and a heat insulating film non-formation part that does not have a heat insulating film and that is positioned further to the outside on a cylinder bore side of the internal combustion engine than the heat insulating film formation part.