| 摘要 |
PURPOSE:To improve an effect of heat insulation and form an exhaust manifold in light weight, by forming the main unit of the exhaust manifold to double construction comprising an inner pipe unit molding ceramic fiber and an outer pipe unit made of aluminum integrally cast into the inner pipe unit. CONSTITUTION:The main unit 10 of an exhaust manifold comprises an inner pipe unit 11, in which ceramic fiber such as silica alumina fiber, alumina fiber and silica fiber is molded, and an outer pipe unit 12 cast outside the inner pipe unit 11 by using an aluminum material. In this way, the main unit 10 of the exhaust manifold can be formed to integral construction of all cylinders by preventing excessive thermal heat from being applied to the inner pipe unit because molten aluminum at a low temperature is used for the outer pipe unit 12 when it is cast. |
