Patent ID: 7918216

Claim:
An exhaust gas recirculation device for an internal combustion engine comprising: an exhaust gas recirculation line for externally recirculating exhaust gas from an exhaust gas side of the internal combustion engine into a fresh gas side of the internal combustion engine, a cooling circuit operating with a liquid coolant; an exhaust gas recirculation cooler, which is built in the exhaust gas recirculation line and which is connected to the cooling circuit; a cooler housing included in the exhaust gas recirculation cooler, where the cooler housing comprises at least an exhaust gas inlet, an exhaust gas outlet, a coolant inlet, and a coolant outlet, and through which coolant flows; a first cooling tube arrangement included in the cooler housing of the exhaust gas recirculation cooler, the first cooling tube arrangement comprising at least one cooling tube connecting the exhaust gas inlet with the exhaust gas outlet; and a second cooling tube arrangement comprising at least one cooling tube connecting the exhaust gas inlet with the exhaust gas outlet, wherein at least one cooling tube of the second cooling tube arrangement includes at least one of having a higher heat transfer coefficient material than each cooling tube in the first cooling tube arrangement, having a smaller flow-through cross section on the exhaust side than the at least one cooling tube of the first cooling tube arrangement on the exhaust side, and having a higher flow-through resistance than the at least one cooling tube of the first cooling tube arrangement; and wherein the first and the second cooling tube arrangements are formed such that the second cooling tube arrangement allows a higher heating flow between exhaust gas and coolant than the first cooling tube arrangement.