Abnormal use of the vehicle or imperfect maintenance, the leaf spring used for a short time, there will be damage, it is not normal, belonging to early damage. The phenomenon of early damage of leaf springs in the northern V3 fittings is more common in mountainous areas. The main reason for the premature damage of leaf springs is the following reasons:
(1) in the overload or partial load vehicles often used under the condition of the leaf spring is based on the vehicle load weight design, if the vehicle used in actual load greatly exceed rated load car quality, or serious partial load, steel plate spring had bending stress at work will make the resistance the fatigue strength of the steel plate spring is greatly reduced, the early damage of leaf spring. According to regulations, even loading can improve vehicle utilization and prolong the service life of leaf springs.
(2) the speed of the vehicle is too high, especially in the bad road on the high speed, will make the leaf spring deformation amplitude increases, frequency increases, cause the leaf spring to accelerate fatigue and damage. In this letter to the user to extend the service life of the spring plate, the vehicle should be the economic speed, in bad road at low speed.
(3) vehicles often use emergency braking. Use the emergency brake in the vehicle when driving, due to the effect of the inertia force, the spring plate especially the front spring to bear large bending stress and tensile stress, when exceeding the allowable stress, will cause the broken steel plate spring. Vehicles should be driven at a moderate speed, with more engine exhaust braking, less emergency braking.
(4) the speed of the car is too high when turning. The car will have a sharp turn, the centrifugal force is too large, will greatly increase the lateral spring load, accelerate the damage of leaf spring. In order to prolong the service life of the leaf spring and increase the economic benefits, it should be noted that the speed should be slowed down during the turn.
(5) the loose bolts or bolts of the center spring of the spring fittings of the northern V3 fittings will cause the load of the main leaf of the leaf spring to increase and cause early damage. In peacetime maintenance, should pay attention to riding bolts, central bolt fastening, if damaged should be replaced in time.
(6) the poor lubrication of the leaf spring and the failure of the absorber will cause the early damage of the leaf spring. Should pay more attention to maintenance and lubrication at ordinary times. North Ben V3 parts shock absorber failure should be repaired, such as damage should be replaced in time.