| 摘要 |
PURPOSE:To prevent an excessive rise of temperature in a manifold and extend its durable life, by providing a heat insulating layer, solidifying a fire-resistant heat insulating material dust, on an internal surface of the cast iron made manifold while a fire-resistant layer, solidifying a fire-resistant material dust, on the surface of said heat insulating layer. CONSTITUTION:A cast iron made manifold provides a heat insulating layer, solidifying a fire-resistant heat insulating material dust, on an internal surface of the manifold further a fire-resistant layer, solidifying a fire-resistant material dust, on the surface of said heat insulating layer. Here the fire-resistant heat insulating material, used for giving a heat insulating property, uses an inorganic heat insulating material of shirasu balloon, foaming silica, pearlite, etc. While the fire-resistant material preferably uses, for instance, zirconia or the like with low heat conductivity. In this way, the fire-resistant heat insulating layer, being provided between the fire-resistant layer and the manifold, prevents the manifold from being heated to a temperature exceeding 600 deg.C even for the passing of exhaust gas at a temperature exceeding, for instance, 1,000 deg.C, and a durable life of the manifold can be substantially extended.
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