HEAT INSULATION FILM

• Main Authors: SHIMODA KENJI, NISHIO KAZUAKI, NAKADA HIROMICHI
• Format: Patent
• Language: English; Japanese
• Published: 08.02.2018
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; COMBUSTION ENGINES; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

PROBLEM TO BE SOLVED: To inhibit a crack, film separation and the like from occurring in a surface part of a heat insulation film due to repeated thermal stress generated in a radial direction of a surface facing an engine combustion chamber in a cylinder head.SOLUTION: A heat insulation film 1 is formed at a surface facing an engine combustion chamber in a cylinder head 10. In a film surface part, a first region 5 where fine cracks 4 occur and a second region 7 where the fine cracks 4 do not occur are provided alternately in a substantially concentric circular shape.SELECTED DRAWING: Figure 1 【課題】シリンダヘッドにおけるエンジン燃焼室に臨む面の半径方向に発生する繰り返し熱応力によって、断熱皮膜の表面部に亀裂や皮膜剥がれ等が発生するのを抑える。【解決手段】シリンダヘッド１０におけるエンジン燃焼室に臨む面に形成される断熱皮膜１である。皮膜表面部に、微細割れ４が発生している第１領域５と、微細割れ４が発生していない第２領域７とが、略同心円状に交互に設けられている。【選択図】図１