| 摘要 |
PROBLEM TO BE SOLVED: To provide an EGR device for internal combustion engines capable of achieving miniaturization while restraining the decline of cooling ability of an EGR cooler, and capable of restraining the deterioration of an exhaust purifying catalyst and achieving improvement of catalyst performance.SOLUTION: An EGR device (5) for internal combustion engines comprises an EGR cooler (40) disposed in an EGR passage (20) for recirculating a part of exhaust discharged from an internal combustion engine (10) to the internal combustion engine for cooling down the exhaust passing through the EGR passage. An internal gas passage (41) for passage of exhaust, and an internal refrigerant passage (42) disposed in the periphery of the internal gas passage for passage of a refrigerant are provided inside the EGR cooler. The internal gas passage is provided with a first heat exchanger (45) as a medium for heat exchange between the refrigerant of the internal refrigerant passage and the exhaust of the internal gas passage, and a second heat exchanger (46) having a heat conduction ratio that is lower than that of the first heat exchanger so that the second heat exchanger is disposed in the exhaust flow direction upstream of the first heat exchanger. An exhaust purifying catalyst is carried by the second heat exchanger. |
