Lubrication of automobile leaf spring
The lubrication of automobile leaf spring is very important. As we all know, leaf springs are composed of many steel sheets with elasticity, consistent width and thickness, and different lengths. Its function is to connect the frame and axle in the form of suspension, expose between the frame and axle, bear the load impact of wheels on the frame, reduce the violent vibration of the body, and maintain the stability of vehicle driving and adaptability to different road conditions.
When the leaf spring bears the load impact, it forms extension movement, and there is strong friction between the steel sheet and the steel sheet, that is, extrusion and tension.
The two friction surfaces generate motion friction in two different directions, resulting in the temperature rise of the leaf spring, surface strain and small strong lines. While the load impact frequency increases, The friction force generated by extension is also increasing. Reaching the fatigue limit at the stress concentration point will cause the fracture of a single piece or a whole stack.
According to the principle of motion mechanics, the test shows that when the motion frequency increases, the temperature of a steel part increases and the strength decreases. Strong lines appear at the stress concentration point and gradually expand and deepen, and it will be damaged at the fatigue limit. The same is true of leaf spring, but it has high elasticity and is more durable than ordinary steel parts. In addition to other reasons, the main reason for the fracture of leaf spring is poor lubrication. The driver and technical management personnel should pay attention to it and do a good job in the lubrication of leaf spring in time.
The general lubrication method is: it should be carried out at the end of the running in period of new vehicles, and when using vehicles in summer and winter. During lubrication, first remove the leaf spring, open the middle through bolt to spread the steel sheet, and then evenly apply lithium base grease or graphite grease on both sides of the steel sheet to form an oil film between the two friction surfaces after reassembly (only one broken piece needs to be replaced to complete the lubrication of a group of leaf springs).
The lubrication of leaf spring has three advantages: first, reduce friction and disperse stress to prevent steel sheet surface damage; Second, reduce the invasion of dust, soil and water to prevent corrosion; Third, heat dissipation and cooling to prevent the decline of elastic strength.
The lubrication time should be once every quarter in the South and once every half a year in the north. It can also be properly controlled according to the driving mileage (the method of often dripping oil also plays a certain role in lubrication).
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