An exhaust heat recovery device according to one aspect of the present disclosure includes a heat exchanger, a supply flow path, and a discharge flow path. The heat exchanger has a plurality of heat exchange flow paths configured to carry out heat exchange between exhaust gas and a heat exchange medium. The supply flow path is configured such that the exhaust gas flows therethrough, and the flowing exhaust gas is supplied to the plurality of heat exchange flow paths while being branched. The discharge flow path is configured to merge and discharge the heat-exchanged exhaust gas having passed through the plurality of heat exchange flow paths. At least one flow path of the supply flow path and the discharge flow path is configured to be narrower toward a downstream side in a flow direction of the exhaust gas.

An exhaust heat recovery device according to one aspect of the present disclosure includes a heat exchanger, a supply flow path, and a discharge flow path. The heat exchanger has a plurality of heat exchange flow paths configured to carry out heat exchange between exhaust gas and a heat exchange medium. The supply flow path is configured such that the exhaust gas flows therethrough, and the flowing exhaust gas is supplied to the plurality of heat exchange flow paths while being branched. The discharge flow path is configured to merge and discharge the heat-exchanged exhaust gas having passed through the plurality of heat exchange flow paths. At least one flow path of the supply flow path and the discharge flow path is configured to be narrower toward a downstream side in a flow direction of the exhaust gas.

An exhaust heat recovery device includes a heat exchanger that performs heat exchange between exhaust gas flowing in from a first exhaust gas conduit and a fluid as a heated object. Regarding the heat exchanger, a flow passage for the exhaust gas inside the shell is configured so that the exhaust gas flowing in from the exhaust gas inflow passage reaches a branch after contacting a plate in a division area and the exhaust gas not branched to an exhaust gas recirculation flow passage at the branch flows out to a second exhaust gas conduit after contacting a plate in a division area.

An exhaust heat recovery device includes a heat exchanger that performs heat exchange between exhaust gas flowing in from a first exhaust gas conduit and a fluid as a heated object. Regarding the heat exchanger, a flow passage for the exhaust gas inside the shell is configured so that the exhaust gas flowing in from the exhaust gas inflow passage reaches a branch after contacting a plate in a division area and the exhaust gas not branched to an exhaust gas recirculation flow passage at the branch flows out to a second exhaust gas conduit after contacting a plate in a division area.

An intake and exhaust device (1) for a vehicle engine is capable to perform a compression self-ignition operation, the device comprising on an intake passage a supercharger (9) driven by a force other than an exhaust gas, wherein an exhaust purification device (18) disposed on an exhaust passage is disposed adjacent to an outer surface of the engine (2).

An exhaust system device (1) for a vehicle (100) comprises an exhaust purification device (18) and a first exhaust gas recreation (EGR) cooler (24). The exhaust purification device (18) is disposed with a central axis of a downstream-side end inclined downwardly toward a rear side of the vehicle (100). The EGR cooler (24) is provided so as to introduce exhaust from a downstream side of the exhaust purification device (18), is adjacent to the exhaust purification device (18) and fixed to the exhaust purification device (18), and is disposed such that a central axis of the EGR cooler (24) is inclined downwardly toward the rear side of the vehicle.

An exhaust system device (1) for a vehicle (100) comprises an exhaust purification device (18) and a first exhaust gas recreation (EGR) cooler (24). The exhaust purification device (18) is disposed with a central axis of a downstream-side end inclined downwardly toward a rear side of the vehicle (100). The EGR cooler (24) is provided so as to introduce exhaust from a downstream side of the exhaust purification device (18), is adjacent to the exhaust purification device (18) and fixed to the exhaust purification device (18), and is disposed such that a central axis of the EGR cooler (24) is inclined downwardly toward the rear side of the vehicle.

A vehicle engine 2 comprises an exhaust system having an exhaust manifold 12 and an exhaust purification device 18. The exhaust manifold 12 is disposed at a predetermined distance from a dash panel 106 constituting a body of the vehicle 100, the exhaust purification device 18 is disposed in a position overlapping a floor tunnel region 114, formed by a floor tunnel of the body, and is disposed below the exhaust manifold 12 and to one side of the center of the engine 2 in the cylinder-array direction, as viewed from the longitudinal direction of the vehicle 100. An exhaust purification device introduction passage 17 connecting the exhaust manifold 12 and the exhaust purification device 18 is disposed on the other side of the center of the exhaust manifold 12 in the cylinder-array direction, and extends below the exhaust manifold 12 to be connected to the exhaust purification device 18.

An EGR cooler includes a housing having coolant inlet and outlet, through which coolant flows into and out of the housing, and having gas inlet and outlet through which exhaust gas flows into and out of the housing, a plurality of first tubes provided in the housing while one end of each of the first tubes communicates with the gas inlet and the other end thereof communicates with one end of a connection passage, a plurality of second tubes provided in the housing while one end of each of the second tubes communicates with the gas outlet and the other end thereof communicates with the other end of the connection passage, and first and second cooling fins inserted into the respective first and second tubes, wherein the gas inlet has a larger cross-sectional area than the gas outlet.

An EGR cooler includes a housing having coolant inlet and outlet, through which coolant flows into and out of the housing, and having gas inlet and outlet through which exhaust gas flows into and out of the housing, a plurality of first tubes provided in the housing while one end of each of the first tubes communicates with the gas inlet and the other end thereof communicates with one end of a connection passage, a plurality of second tubes provided in the housing while one end of each of the second tubes communicates with the gas outlet and the other end thereof communicates with the other end of the connection passage, and first and second cooling fins inserted into the respective first and second tubes, wherein the gas inlet has a larger cross-sectional area than the gas outlet.