The main function of the universal joint is to transmit […]
The main function of the universal joint is to transmit the rotating torque between the shafts on different axes. It is widely used in the transmission shafts of various trucks and between the connecting shafts and forks. Usually, the universal joint cross shaft is used during use. The needle roller bearing does not rotate, but rotates and swings, and its load presents alternating periodic changes. The universal joint cross shaft assembly is also a kind of connecting device. Let me introduce to you the reasons for the failure of the universal joint cross shaft assembly, so that you can take some effective measures to solve these situations in the future. this problem.
Reasons for failure of universal joint cross shaft assembly:
1. Oblique impression
When the total circumferential clearance of the bearing in the universal joint cross shaft assembly is relatively large, the needle roller is prone to skew, which makes the angle imprint between the journal and the axis of the cross shaft. If the embossing continues to go deeper, the needle will not be able to rotate and the frictional resistance will increase. Therefore, the total circumferential clearance of the bearing should be controlled within the range of 0.1-0.4mm.
2. Fatigue peeling
If the radial gap between the cross shaft and the bearing is gradually enlarged due to wear, the load will be concentrated, and fatigue indentation will occur where the load is relatively large, and fatigue spalling will eventually appear, and it will be large.
3. Lack of oil ablation
If the lubrication is not in place or the lubrication is insufficient, or the bearing is not well sealed, it will cause the bearing to lose oil, or the sealing material will age and crack. In addition, if there is no lubricating oil, the temperature of the universal joint cross shaft assembly will be too high during use, causing the bearing and journal to seize, damaging the needle rollers and sealing parts, etc., which will eventually cause the ring Ablation on the surface.
4. Needle roller or gasket failure
If there are pits or pits on the needle surface, or the needle head is broken, the needle will fail. The failure of the gasket is mainly due to the fracture of the gasket or the wear of the gasket. These are all related to the size and structure of bearings and gaskets, so they must be designed reasonably. In addition, the material of the gasket should be selected with high strength and wear resistance to avoid this phenomenon.