| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase the efficiency of the heat recovery of an exhaust gas heat recovery device from an internal combustion engine. <P>SOLUTION: An inner pipe 10, a coil tube 20, an inner shell 30 and an outer shell 40 are coaxially disposed from the radial inside to the outside sequentially. An inner space of the inner pipe 10 is formed as a main exhaust gas passage 51, and a space between the inner pipe 10 and the inner shell 30 is formed as a detour exhaust gas passage 52. By a switching means 60, exhaust gas is made to selectively flow to either of the main exhaust gas passage 51 and the detour exhaust gas passage 52. A space between the outer shell 40 and the inner shell 30 is formed as a first cooling water passage 71, and an inner space of the coil tube 20 is formed as a second cooling water passage 72. The inner shell 30 is formed with bossed 31, 32 which are protruded in the radial inner direction and recessed at the outside, both ends of the coil tube 20 are fixed to the bosses 31, 32, and cooling water passages 71, 72 are made to communicate each other at the fixed parts. <P>COPYRIGHT: (C)2013,JPO&INPIT |
