How to better protect the automobile leaf spring

The automobile leaf spring is a vital component for the car, and it is also a component that is easily damaged. So is there any good way to protect it? What should we pay attention to in daily use? The following are some matters to pay attention to when using automobile leaf springs. When driving on uneven roads, we should drive carefully, slow down, and reduce the stress impact of the car body on the leaf spring. We can start from the following points.

 

1. The vehicle travels too fast, especially on a not-so-good road surface, which will increase the deformation fluctuation of the steel leaf spring and increase the frequency, causing the steel leaf spring to fatigue and damage faster.

 

2. Grease can be applied to the surface of the automobile leaf spring to prevent oxidation of the surface of the automobile leaf spring to form gaps and cracks. Apply lubricating oil between the single leaves of the leaf spring to reduce the friction between the single leaves and increase the service life.

 

3. After the car has been driven for a period of time, the leaf spring should be checked in time for gaps. If there are gaps, it must be replaced in time. Do not overload the truck when pulling goods to avoid exceeding the load of the leaf spring and causing the leaf spring to break.

 

4. Check the leaf spring center screw and U-bolt regularly for signs of breakage. If there is any breakage, replace them in time.

 

5. Reduce emergency braking when the vehicle is driving, and use the engine's exhaust brake more often. When the vehicle uses emergency braking while driving, due to the effect of inertia, the leaf spring, especially the front leaf spring, is subjected to excessive bending stress and tensile stress. When the allowable stress is exceeded, the leaf spring will break.

 

6. When the vehicle is turning, the speed is too high and the car turns too fast, which will generate excessive centrifugal force, greatly increase the load of the outer leaf spring, and accelerate the damage of the leaf spring. Therefore, we should pay attention to slowing down when turning.

 

Precautions for disassembly and assembly of automobile leaf springs

 

When disassembling and assembling automobile leaf springs, the leaf springs are often damaged due to some improper operations. The following are some precautions for the disassembly and assembly of leaf springs:

 

1. When removing the leaf spring assembly from the vehicle, first remove the leaf spring pin, then move the leaf spring assembly and the axle out of the vehicle, and finally remove the leaf spring riding bolts for disassembly.

 

2. When disassembling leaf springs, special tools should be used. It is best to use a copper hammer or copper rod. Do not use iron tools to hammer the side and surface of the spring leaf.

 

3. After the leaf spring assembly is disassembled, the steel leaf should not be broken. The easiest way to check for breakage is to knock and listen.

4. When inserting the leaf spring lock, the semicircular groove on the lock should be aligned with the designated bolt hole.

 

5. There is a designation on the pad of the rear leaf spring, which must not be damaged during disassembly. This designation is for the rear frame system and the rear axle designation. It must not be lost and its certain extension width must be guaranteed.

 

6. When installing the leaf spring, the gap between the spring leaves of the leaf spring is greater than 1.2mm. Before tightening the core bolt, the spring assembly should be pressed tightly, and the core bolt should be tightened after each piece is tightened. The tightening torque is 40, 60N/m.

 

7. Before installing the leaf spring, the rust on each piece must be cleaned and coated with graphite grease.

 

8. When installing leaf springs, the number of front and rear leaf spring assemblies should be equal, the total thickness difference should not exceed 5mm, and the camber difference should not exceed 10mm.

 

9. When installing leaf springs, the lateral displacement of each leaf spring steel sheet should not exceed 2.5mm.

 

10. When installing, there should be a 0.7-1mm gap between the steel clip of the leaf spring and the steel on both sides, and the gap between the steel clamp bolt sleeve and the steel and the top surface should be 1-3mm. The steel clamp bolt should be passed from the inside to the outside to prevent the bolt from running out and scratching the wheel band.

 

11. When installing leaf springs, the riding bolts should be tightened evenly and staggered, and the tightening torque should be in accordance with the technical requirements. It should be carried out after loading and checking the wheelbase.

 

12. When loading the leaf spring assembly, you can use a pry bar to align the steel bushing hole with the bracket pin hole, install the steel pin, and then lock it and inject lubricating grease.

 

13. Before using a new vehicle, or reassembling the leaf spring, after installing the leaf spring assembly, the nut of the "U"-shaped bolt must be rechecked and tightened under full load static conditions every 200 to 300 km of driving, and this must be repeated 2 to 3 times.