Split type automatic tension pulley bearing of automobile engine

The utility model relates to a split type automatic tension pulley bearing of an automobile engine, which comprises a casing, a bearing, an eccentric support, an oil-containing bearing, a torsion spring, a spring base, a locating plate, a mandrel and a plastic gasket. The mandrel penetrates into the oil-containing bearing and is riveted with the locating plate, the torsion spring is installed in a space formed by the eccentric support, the spring base and the locating plate, the bearing is installed between the casing and the eccentric support, and one end of the eccentric support penetrates through the plastic gasket and the mandrel. The split type automatic tension pulley bearing of the automobile engine has the advantages that 1 the bearing and the casing are matched tightly, a portion of the casing contacted with the bearing forms a certain protrusion due to interference fit adopted in the pressing process, and the protrusion can effectively prevent a belt from moving in a left-and-right mode in the runni