Axle naming method

According to national regulations, the diameter of the pelvis should be used as the drive axle name. We commonly use 457 bridges, 485 bridges, etc. These numbers refer to the diameter of the pelvis on the differential, and the unit is millimeters. There is also a common 140,153 bridge, etc. which refers not to the diameter of the pelvis. 153 is actually a model of Dongfeng. On the Chinese liberation car, it is called the 435 bridge according to the diameter of the disc teeth.