To provide a double tube exhaust manifold capable of preventing spatters remaining in an annular space between an inner tube and an outer tube from mixing into a connection tube to an EGR valve connected to the double tube exhaust manifold.
The double tube exhaust manifold comprises the inner tube 1, the outer tube 2 annularly formed by connecting at least one side edge part thereof by welding, and an interval holding body installed in an annular space 1a formed between the inner tube 1 and the outer tube 2. Opening holes 4 and 6 are formed in the radial direction of the inner tube 1 and the outer tube 2 in the state of being opposed to each other, and the connection tube 7 to the exhaust gas recirculating valve is connected to the opening hole 6. A mesh- like ring 5 is installed between the inner tube 1 and the outer tube 2 in the state of burying an annular opening part 4a formed between the opening edge parts of both opening holes 4 and 6.
AMADA KATSUMI
AZUMA MICHIAKI
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