Abstract: An EGR cooler and an EGR cooler device includes a pre-cooler which is located at a central region at which a cooling water chamber of an EGR cooler housing, in which cooling water circulates, is divided into two spaces, and in which hot exhaust gas introduced from an exhaust system is discharged as primary-cooled exhaust gas via heat-exchange with the cooling water. Therefore, it may be possible to reduce costs by a decrease in number of EGR tubes via optimal primary cooling performance for the exhaust gas in the pre-cooler and particularly to relieve damage by a thermal load generated due to the hot exhaust gas by fully surrounding an inlet and an outlet of the pre-cooler with the circulating cooling water.

Abstract: An EGR cooler and an EGR cooler device includes a pre-cooler which is located at a central region at which a cooling water chamber of an EGR cooler housing, in which cooling water circulates, is divided into two spaces, and in which hot exhaust gas introduced from an exhaust system is discharged as primary-cooled exhaust gas via heat-exchange with the cooling water. Therefore, it may be possible to reduce costs by a decrease in number of EGR tubes via optimal primary cooling performance for the exhaust gas in the pre-cooler and particularly to relieve damage by a thermal load generated due to the hot exhaust gas by fully surrounding an inlet and an outlet of the pre-cooler with the circulating cooling water.

Abstract: A tube unit of a spark plug for an engine that is used for mounting the spark plug in a cylinder head, may include a spark plug tube including a hollow tube body inserted in an interior mounting hole of the cylinder head, wherein a lower end of the hollow tube body that a gasket is coupled thereto is mounted at an upper end of a penetration hole formed at a lower deck, and a compression bolt engaged to the interior mounting hole of the cylinder head at an upper end of the hollow tube body so as to apply compression force to the hollow tube body and generate surface pressure to the gasket for sealing a gap disposed between the hollow tube body and the penetration hole while the compression bolt is engaged to the interior mounting hole of the cylinder head.

Abstract: A tube unit of a spark plug for an engine that is used for mounting the spark plug in a cylinder head, may include a spark plug tube including a hollow tube body inserted in an interior mounting hole of the cylinder head, wherein a lower end of the hollow tube body that a gasket is coupled thereto is mounted at an upper end of a penetration hole formed at a lower deck, and a compression bolt engaged to the interior mounting hole of the cylinder head at an upper end of the hollow tube body so as to apply compression force to the hollow tube body and generate surface pressure to the gasket for sealing a gap disposed between the hollow tube body and the penetration hole while the compression bolt is engaged to the interior mounting hole of the cylinder head.