Wheel nut 1) Through the analysis and calculation of the wheel bolt torque and pre-tightening force, it is concluded that the pre-tightening force in the fixed torque assembly depends on the friction coefficient of the thread surface and the friction coefficient of the contact surface, and the slight change of the friction coefficient The preload has a great influence. 2) Through the measurement of the friction coefficient, the friction coefficient of the contact surface of the wheel connection pair is much larger than that of the thread, and the friction coefficient of the contact surface has a greater influence on the comprehensive friction coefficient.3) It can be seen from the test data that white zinc plating and yellow zinc plating have little effect on the friction coefficient of the contact surface, the friction coefficient of the thread, and the comprehensive friction coefficient. Without an external friction coefficient sealant, the friction coefficient of the thread is relatively stable. It shows that the thread processing and surface treatment processes of this batch of nuts are consistent, but the friction coefficient of the contact surface fluctuates greatly. Due to the Furniture Screws company, the friction coefficient of the contact surface of the nut is very stable. 4) Through the test and inspection of the wheel nuts with different surface treatments in the normal supply state, it is concluded that the nuts with the phosphate treatment method can provide a very stable comprehensive friction coefficient without the use of a friction coefficient sealant. Provide a stable and controllable pre-tightening force to ensure reliable connection of the connection pair.
