| 摘要 |
PURPOSE:To reduce a manufacturing cost and improve durability, by forming a body of an auxiliary combustion chamber with a material having a small coefficient of thermal expansion, a high-temperature strength and a heat resistance to some extent, and forming a peripheral edge of an acute angle portion at an injection port with a material having a high heat resistance. CONSTITUTION:In an auxiliary combustion chamber for a Diesel engine, a peripheral edge of acute angle portions having a small sectional area as formed at an injection port 2 by a bottom surface 4 of a swirl chamber 3 and a bottom surface 5 of a body 1 is formed of materials 6 and 7 having a high heat resistance. The other portion of the body 1 is formed of a material having a high- temperature strength and a heat resistance to some extent. In producing the auxiliary combustion chamber, recesses 8 and 9 corresponding to a thickness of the materials 6 and 7 are formed at the peripheral edge of the acute angle portions at the injection port 2. Then, the materials 6 and 7 are built in the recesses 8 and 9, and are worked to form the injection port 2 and the acute portions of the materials 6 and 7.
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