Patent ID: 9303596
Filing Date: 2016-04-05
CPC Classification: F02M

Claim Text:
1. An exhaust gas recirculation (EGR) cooler comprising: an EGR cooler housing including a cooling water chamber in which a cooling water circulates, introduced from outside of the EGR cooler housing and then discharged to the outside thereof; a pre-cooler in which a hot exhaust gas introduced from an exhaust system is discharged as primary-cooled exhaust gas via heat-exchange with the cooling water, the pre-cooler including a space blocked from the cooling water, the pre-cooler being located at a central region at which the cooling water chamber is divided into two upper and lower spaces; and an EGR tube including an upper EGR tube and a lower EGR tube which are respectively located in the upper and lower spaces divided by the pre-cooler, and in which the primary-cooled exhaust gas is converted into secondary-cooled EGR gas via heat-exchange with the cooling water in each of the upper EGR tube and the lower EGR tube, wherein the EGR cooler housing further includes a pre-cooler chamber surrounded and enclosed by the cooling water and sealed from the cooling water, the pre-cooler located at the central region of the cooling water chamber so that the space of the cooling water chamber is divided into the upper space and the lower space below the pre-cooler chamber.