In our life, the transmission shaft hanger is generally used for trucks, but not for small cars. The reason is that the distance between the transmission main shaft of small cars and the driving gear shaft of the rear axle reducer is short, and a set of transmission shaft assembly is used to connect. Therefore, the transmission shaft hanger is not provided. The distance between the drive shaft and the driven shaft of heavy cars is long, and the transmission shaft has a connecting part, so the central hanger is used.

The damage of transmission shaft hanger is mainly affected by three aspects.

1、 Affected by damage of hanger bearing. The reason for the damage of hanger bearing is the lack of lubricating grease in the bearing, which leads to increased wear and open space. Another situation is that the bearing outer diameter and seat hole are loose due to long-term maintenance, and the rubber ring around the bearing seat is broken and peeled off, resulting in the drive shaft jumping in the hanger, resulting in the fracture of the lower half of the hanger, the fracture of bolts and the fracture of bolt joints.

2、 Affected by damage to propeller shaft components. The damage of transmission shaft components is caused by the deformation of front and rear transmission shaft flange forks, universal joint shaft forks and expansion forks, resulting in the axis swing difference during the operation of the whole transmission shaft, the lack of lubricating grease of the cross shaft resulting in loose wear, and the loose wear between the sliding grooves of the expansion fork. The clearance of the whole set of transmission shaft will increase and the axis shimmy will occur during transmission. The central hanger will be affected by its vibration for a long time, resulting in the fracture of the lower part.

3、 Affected by its quality, material and structure. The central hanger of the transmission shaft always keeps the central support of the bearing seat type on the middle cross beam. The material is cast from malleable cast iron, which is only suitable for trucks with relatively low tonnage. The cast hanger is prone to fracture due to improper process, loose metal or porosity, and brittle material. During the maintenance and installation, due to the improper method of fastening bolts, the hanger or hanger cover is not installed in a balanced and uniform manner, so that the hanger or hanger cover is warped and the pressure is concentrated, resulting in the fracture of the hanger.

When the transmission shaft hanger is broken, it will cause the front and rear transmission shafts to be disconnected at the expansion fork, thus causing the running vehicle to fail. At this time, there is a great potential safety hazard. Therefore, the central hanger of the transmission shaft should also be regularly overhauled to prevent accidents.