Bearing shell was part of the sliding bearing and shaft neck contact, shape for the tegular half cylinder, very smooth, general anti-friction alloy wear resistant materials, such as in bronze under special circumstances, can use wood engineering plastic or rubber. Bush has integrated and split two kinds, integral bearing shell is commonly referred to as collar. Integral bearing shell with and without oil groove and has two kinds of oil groove. Bearing and shaft neck adopt the clearance fit, is generally not the shaft rotation.