| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structure of an exhaust circulation pipe for preventing deposits in an exhaust pipe by improving a heat retaining property of the exhaust pipe. <P>SOLUTION: The exhaust circulation pipe 9 which is connected to an inlet part 24 of a casing 21 in an exhaust emission control device 20, has a double pipe structure configured of an outer pipe 8 and an inner pipe 7 provided in the outer pipe 8 so as to be spaced from the outer pipe 8. The outer pipe 8 includes an outer pipe body 8A having a first flange part 8Fa at an axially intermediate part and is detachable from the casing 21, and a casing side outer pipe 8B projected from a peripheral edge 21d of the inlet part 24 and including in the casing 21 a second flange part 8Fb in a projected end 8Ba. The inner pipe 7 is bonded to the outer pipe body 8A, and has a length so that tip portions of the outer pipe body 8A and the inner pipe 7 reaches, through the insides of the casing side outer pipe 8B, a base end 8Be of the casing side outer pipe 8B when connecting both flange parts 8Fa, 8Fb. <P>COPYRIGHT: (C)2012,JPO&INPIT |
