The lower arm is probably a very strange term for many owners, but the lower arm is very important for the driving and safety of the vehicle, so some people say that it is second only to the important parts of the engine and gearbox.

Hem arm of car

Notlong ago, I did not pay attention to the parking, so that the lower arm and the lock came to a close contact, on the spot, the lock was killed. Worry about the vehicle oil sump and other components damaged, I drove to the 4S shop inspection, check the results after another but I was surprised, worried about the oil pan unharmed, the lower arm of the right front wheel has been some damage, the yellow paint on the lock arm in the lower edge is adhesion.

Lower arm of single layer stamping parts

The above said this story, is to tell the majority of owners, the chassis was once rub, not only to pay attention to the oil pan and other powertrain components, the fragile suspension also must carefully check. Here is a detailed description of the extremely neglecting arm of the lower swing.

Hem arm: one of the swinging arms on the car, the main function is to support the body and shock absorber, and to buffer the vibration of the driving. The shock absorber can play a very good auxiliary role in the lower suspension. It cooperates with the shock absorber and spring to form a complete set of hanger arms to support weight and steering. At present, the main main material of the lower swing arm in the market is divided into four kinds:

suspension

1. aluminum alloy material: aluminum alloy material has the characteristics of light weight and high strength, and the aluminum alloy has good toughness. It can better cooperate with suspension motion. But the aluminum alloy bottom arm is the most expensive, and it is mainly used for all luxury brands.

2. cast iron material: the so-called cast iron is to melt the iron after pouring into the mold to create a fixed shape. The strength and rigidity of cast iron is only inferior to that of aluminum alloy. However, due to the characteristics and toughness of cast iron, it is often seen that the front suspension of some vehicles is directly fractured rather than deformed.

3. double stamping: simply, double stamping is 2 pieces of steel plate by stamping machine, stamping forming two separate shapes, and then the two pieces of stamping parts welded together, not as strong as iron, but toughness is better, but the impact will be met with strong deformation.

4. single layer stamping parts: as the name implies, only 1 pieces of stamping parts are not formed as one of the bilateral stamping parts through welding.

Lower arm of single layer stamping parts

The lower ar of each material has been finished, here to talk about how to avoid the lower arm rub, and suffered a severe impact after the vehicle will have what symptom:

In everyday driving, try to avoid the potholes, if cannot avoid, you need to slow down, slow through, it can avoid the severe suspension movement up and down, thereby reducing the chance to contact the lower arm of the road.

If the chassis suffered rub, worried about lower arm injuries, we can first experiment vehicle deviation in the straights (wheel pressure is the same premise), and turn off the car audio, listen carefully to the vehicles in the process, there is no abnormal sound, the steering wheel is on the brakes and jitter, braking, the vehicle is running. If there is any above, it is suggested to go to the repair plant immediately.

Four wheel positioning of vehicles

When it is confirmed that the lower arm is broken and the deformation is damaged, it must be replaced in time. And after the replacement, it is necessary to carry out the precise four wheel positioning operation to avoid the tire running deviation and so on.