| 摘要 |
PROBLEM TO BE SOLVED: To improve exhaust heat recovery efficiency while suppressing increase in circulation resistance of exhaust gas in an exhaust heat recovery device comprising a heat exchange path and a bypass path which are concentrically disposed. SOLUTION: This device comprises a jacket 3 disposed within an outer cylinder (casing) 2 so as to form a medium path 11 for circulating a medium with the outer cylinder 2, a bypass pipe 4 for forming the bypass path 12, disposed so as to form the heat exchange path 10 with the jacket 3, and a valve element 5 (switching means) for switching an exhaust gas route to the heat exchange path 10 and the bypass pass 12. A spiral groove 7 is formed on the jacket 3, and projections 8 facing recessed portions 7a of the spiral groove 7 are provided on the inside of the heat exchange path 10. COPYRIGHT: (C)2008,JPO&INPIT
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