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The leaf spring forms a stretching motion when subjected to a load impact, and a strong friction occurs between the steel sheet and the steel sheet, that is, a squeezing and stretching phenomenon occurs, and the two friction surfaces generate two different directions of motion friction, resulting in a leaf spring temperature. In the case of rise, there is a surface strain and a small fierce appearance. When the frequency of the load shock increases, the frictional movement force generated by the stretching movement also increases. When the stress concentration reaches the fatigue limit, it will cause a single piece or a wholeåž› åž› breaks. ?
According to the principle of motion mechanics, it has been proved by experiments that a steel part performing a compression movement increases the temperature of the steel part when the exercise frequency increases, the strength decreases, and the striation occurs at the stress concentration point and gradually expands and deepens to the limit of fatigue. Will be damaged. The same is true of leaf springs, except that it has higher elasticity and is more durable than ordinary steel parts. In addition to other reasons, the main reason for the rupture of the leaf spring is caused by poor lubrication. Attention should be given to the driver and technical management personnel, and the lubrication of leaf springs should be done in time. ?
The general lubrication method is: the new car should be completed at the end of the run-in period, summer and winter in the car when the two. During the lubricating operation, first remove the leaf spring, open the middle through-bolt to spread the steel sheet, and then apply lithium-based grease or graphite grease on both sides of the steel sheet. After the assembly, the two friction surfaces form an oil film. (The time for completing a set of plate spring lubrication operations only needs to replace a fragment piece). ?
Lubrication of the leaf spring has three advantages: First, it reduces the frictional dispersion stress and prevents the surface of the steel sheet from being scratched. Second, it reduces the intrusion of dust, mud, and water, and prevents corrosion. Third, the cooling of the heat sink prevents the decrease of the elastic strength. ?
Lubrication time should be lubricated once every quarter in the south and lubricated once every six months in the north. It can also be mastered according to the mileage (usually using the oil drip method also plays a certain lubrication).
Lubrication effect and method of automobile leaf spring
Lubrication of automotive leaf springs is very important. Everyone knows that leaf springs are made up of many steel sheets that are flexible, wide and thick, and of varying lengths. Its role is to connect the frame and the axle in a suspended form, exposed between the frame and the axle, to withstand the load impact of the wheel on the frame, to reduce the severe vibration of the body, and to maintain the smooth running of the vehicle and Adaptability of different road conditions. ?