Patent ID: 6874317

Claim:
A double pipe exhaust manifold comprising: an inner pipe; an outer pipe formed in a cylindrical shape by joining at least one side thereof along a longitudinal direction of the outer pipe by welding; a space retaining member disposed in an annular space defined between the inner pipe and the outer pipe; a connection pipe connecting to a exhaust gas recirculation valve; and a mesh ring, wherein opening holes are formed in the inner pipe and the outer pipe so that the opening holes are opposed to each in a radial direction of the pipe; wherein the connection pipe is connected to the opening hole of the outer pipe; wherein the mesh ring is interposed between the inner pipe and the outer pipe in a state that the mesh ring plugs an annular opening part defined between opening edges of the opening holes; and wherein the mesh ring is fixed to at least one of the inner pipe and the outer pipe by welding.