| 摘要 |
PROBLEM TO BE SOLVED: To provide a pre-combustion chamber type internal combustion engine that is provided with a pre-combustion chamber enabling gas replacement with a main combustion engine via a communication passage, and utilizes pressure difference between the main combustion engine and the pre-combustion chamber by igniting within the pre-combustion chamber, thereby injecting flame in torch-shape from the communication passage, wherein there is provided with a construction of the pre-combustion chamber wall capable of cooling effectively the end of pre-combustion chamber wall in order to avoid unexpected heating surface firing at the end of the pre-combustion chamber during high-load operation. SOLUTION: An thermal conductivity of an outer wall of a pre-combustion chamber is made higher than an thermal conductivity of an inner wall thereof by forming the outer wall of a pre-combustion chamber in internal-combustion engine with a member having a high thermal conductivity, or coating with a member having a high thermal conductivity, or forming with a sheet member having a high thermal conductivity. COPYRIGHT: (C)2007,JPO&INPIT
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