| 摘要 |
PURPOSE:To prevent the occurrence of preignition as well as to improve the extent of heat resistance, by using a ceramic sintered body made of nitride as a cylinder head, while unifying an electrode material excellent in the heat resistance and the cylinder head at the time of sintering. CONSTITUTION:A cylinder head 1 consists of a nitriding silicon sintered body having high insulating and high thermal conductive properties. A shaft hole 1d composed of both an end side small diametral hole 1e and a terminal side large diametral hole 1f partitioned by a step part 1c to be reduced in diameter is made up on this combustion chamber inner surface 1a, and inside this shaft hole, a heat resisting positive electrode 2 provided with a discharge part 2a firmly coupled and projected to and from the combustion chamber inner surface 1a is installed. In addition, a negative electrode 3 opposite to the electrode 2 is coupled alike with the shaft hole 1d. Sintering for the cylinder head is carried out after both positive and negative electrodes 2 and 3 are formed up in advance. With this, not only preignition is prevented but also heat resistance is improved, say, a double purpose. |
