ENGINE AND PISTON

摘要

An engine comprising: a cylinder block having a bore; a piston fitted so as to be capable of reciprocating movement in the bore so as to form a combustion chamber; a cylinder head that closes the combustion chamber and has a valve hole communicated with the combustion chamber; and a valve for opening and closing the valve hole. In one or more of the piston, the cylinder head, and the valve, a heat-insulating coating film covers the wall surface that faces the combustion chamber. The heat-insulating coating film is composed of a heat-insulating layer and an inorganic covering layer for covering the surface of the heat-insulating layer. The heat-insulating layer has a resin, and first hollow particles that are embedded within the resin and that have an average particle diameter less than the thickness of the heat-insulating layer. The inorganic covering layer contains an inorganic compound.