IN-CYLINDER FUEL-INJECTION TYPE INTERNAL COMBUSTION ENGINE, PISTON FOR IN-CYLINDER FUEL-INJECTION TYPE INTERNAL COMBUSTION ENGINE AND PROCESS FOR MANUFACTURING PISTON FOR IN-CYLINDER FUEL-INJECTION TYPE INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a piston for an in-cylinder fuel-injection type internal combustion engine having a low thermal conductive material capable of further improving heat insulating property.;SOLUTION: This piston for in-cylinder fuel-injection type internal combustion engine has a low thermal conductive member comprising low thermal conductive base material, and coating layer including alumina (Al₂O₃) fine particles adhering on at least part of a cast-in surface cast in a piston body part at one surface side of the low thermal conductive base material cast in a piston top part. A heat insulating layer comprising the coating layer and or an air gap layer caused by the same is formed between the low thermal conductive member and the piston body thereby. As a result, low thermal conductivity of a fuel impingement zone can be easily improved as compared to a case that the low thermal conductive member is simply cast in.;COPYRIGHT: (C)2010,JPO&INPIT