Loss problem
The damage, wear, deformation and loss of dynamic balance of the drive shaft parts will cause the car to produce abnormal noise and vibration during driving, and in serious cases will cause damage to related components. When the car is driving, it emits the sound of "Gordon" when it starts or accelerates, and it obviously shows the feeling of loose parts. If it is not the loose gear of the drive axle, it is obviously the loose parts of the drive shaft. The loose part is nothing more than a universal joint cross bearing or a steel bowl and flange fork, a splined shaft and a splined sleeve of the telescopic sleeve. Generally speaking, the cross shaft diameter and bearing clearance should not exceed 0.13mm, and the meshing gap between the telescopic spline shaft and spline sleeve should not be greater than 0.3mm. It should be repaired or replaced if the usage limit is exceeded.
If the chassis "buzzes" while the car is running, and the higher the running speed, the louder the sound. This is generally due to the loose wear of the universal joint cross shaft and the bearing, the wear of the intermediate bearing of the transmission shaft, the damage of the intermediate rubber support, or the loosening of the hanger, or the wrong position of the fixed hanger.
1) The traditional method for the wear of the drive shaft in China is generally to use welding, bushing, pitting, etc., but when the material of the shaft is 45 steel (tempered), if only the surfacing treatment is used, then Welding internal stress will occur. Under heavy load or high-speed operation, cracks or even fractures may occur at the shoulder of the shaft. If stress relief annealing is used, it is difficult to operate, and the processing cycle is long, and the maintenance cost is high; when the shaft is When the material is HT200, it is not ideal to use cast iron welding. Some companies with high maintenance technology will use brush plating, laser welding, micro-arc welding and even cold welding, etc. These maintenance technologies often require high requirements and high costs.
2) The latest repair methods The above repair technologies are not very common in European, American, Japanese and Korean companies. Generally, polymer composite technology and nanotechnology are used in developed countries. Polymer technology can effectively improve the maintenance efficiency and reduce the maintenance efficiency on site. Maintenance cost and maintenance intensity. Compared with traditional technologies, polymer composite materials have both the strength and hardness required by metals, and the concessions (variable relationships) that metals do not. Through "mold repair", "part correspondence", "machining", etc. The process can maximize the size of the repaired parts and the matching parts; at the same time, the comprehensive advantages of the composite material itself, such as compression, bending, elongation, etc., can effectively absorb the impact of external forces and greatly resolve and offset the bearings The radial impact force on the shaft avoids the possibility of gaps, and thus avoids the secondary wear of the equipment due to the increase in gaps.