What to do when the cardan shaft is worn

The damage, wear, deformation, and loss of dynamic balance of cardan shaft components will cause abnormal noise and vibration during the driving of the car, and in severe cases will cause damage to related components. In the process of driving, when the car starts or accelerates, it will make a "Gordon" sound, which obviously shows the feeling of loose parts. If the drive axle gear is not loose, the cardan shaft is obviously loose. The loose parts are universal joint cross bearings or steel bowl flange forks, spline shafts, expansion sleeves and spline sleeves. Generally, the diameter of the cross shaft and the bearing spacing should not be greater than 0.13mm, and the meshing gap between the expansion spline shaft and the spline sleeve should not be greater than 0.3mm. Repair should be carried out when it exceeds the scope of use.

1. In the traditional method, repair welding, insert sleeves and stripping points are often used for universal joint shaft wear. However, when the universal joint shaft material is 45 steel (quenched and tempered), as long as the surface treatment is carried out, internal welding stress will be generated. During heavy load operation, cracks or even fractures may appear at the shaft shoulder. If stress annealing is used, it will be very difficult. When the shaft material is HT200, cast iron welding is not ideal. Some companies with higher maintenance technology will use brush plating, laser welding, micro-arc welding and even cold welding. These maintenance techniques usually require high requirements and costs.

2. Polymer technology can improve maintenance efficiency through on-site operations, reduce maintenance costs and maintenance intensity. Polymer composite materials not only have the strength and hardness required by metals, but also have characteristics (variable relationships) that metals do not have. At the same time, the resistance of the composite material itself can also be used. Compression, bending resistance, ductility, etc., can absorb the impact of external forces, reduce the radial impact of the bearing on the shaft, reduce the possibility of gaps, and prevent secondary wear caused by the increase in equipment gaps.