Internal combustion engine

• Main Author: TATENO MANABU
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2017
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES ORMATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHERTHAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES; INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

A thermal insulation film 34 is formed on a bottom surface of a cylinder head 18 facing a top surface of a piston 14. The thermal insulation film 34 in a region (a circumferential region) of a bottom surface of the cylinder head 18 configuring a squish area in a circumferential edge of a cavity region is formed to be thinner than the thermal insulation film 34 in a region (a cavity region) of the bottom surface of the cylinder head 18 facing a cavity 22. The thermal insulation film 34 in the circumferential region is polished, and surface roughness thereof is equal to or lower than 3 [mu]m. The thermal insulation film 34 in the cavity region is not polished, and surface roughness thereof is 3 to 8 [mu]m on average. 在与活塞(14)的顶面对向的气缸盖(18)的底面上形成有隔热膜(34)。气缸盖(18)的底面的在腔室区域的周缘中构成挤气区域的区域(周缘区域)中的隔热膜(34)形成为比气缸盖(18)的底面的与腔室(22)对向的区域(腔室区域)中的隔热膜(34)薄。周缘区域中的隔热膜(34)被抛光，并且其表面粗糙度在3μm以下。腔室区域中的隔热膜(34)未被抛光，并且其表面粗糙度平均为3至8μm。