| 摘要 |
In the present invention, when forming a heat shield film resulting from applying a heat insulating coating material or a heat shielding coating material to the wall surface of a combustion chamber, the heat insulating coating material or heat shielding coating material (heat shield film) is strongly bonded to the wall surface of the combustion chamber. This engine (10) combustion chamber structure is provided with a combustion chamber (16) demarcated by a cylinder bore (12), the bottom surface of a cylinder head (15), and the apex of a piston (13), and at least a portion of the wall surface of the combustion chamber (16) is configured from aluminum or an aluminum alloy. The engine (10) combustion chamber structure is provided with: a plurality of dimples (24) provided, in order to increase the surface area of the wall surface of the combustion chamber (16), to the wall surface of the combustion chamber (16) configured from aluminum or an aluminum alloy; a boehmite coating film (25) formed at the wall surface of the combustion chamber (16) to which the plurality of dimples (24) have been formed; and a heat shield film (23) provided to the surface of the boehmite coating film (25) and formed by applying a heat insulating coating material or a heat shielding coating material to the surface of the boehmite coating film (25). |
