Automobile brake drum is an important safety protection component in the overall organization structure of automobiles. It is also the main detection and maintenance target in the daily management and maintenance of automobiles. According to the conventional three package of the car maintenance feedback information, the failure of the automobile brake drum for a variety of reasons, specifically speaking, including the following, respectively: cracking, cracking, falling, wear too much, abnormal wear.

Failure reason analysis of automobile brake drum

1. Cause analysis of crack failure

Automobile brake drum will be affected by various forces in the normal operation process, mainly including the normal pressure of horseshoe, rotation and the shear force of the splice of the shoe. The two forces complement each other, and if the normal pressure does not exist, the tangential force will disappear. However, in the normal operation process, there will be friction and heat generation between the two, at which time the brake drum temperature will continue to rise, and the friction between the two is a speckle contact friction, so the contact surface will also undergo a phase transition phenomenon when subjected to friction heat generation, and finally produce phase transition stress. The phase transition stress will lead to uneven force on the brake drum, which will lead to regular cracks under the frequent braking load of automobile brake drum.

2. Analysis of cracking failure causes

Brake drum cracking also covers two levels of housing. First of all, the brake drum will be affected by the difference in material strength, leading to cracking problem. Secondly, after the brake drum cracking problem occurs, the brake drum under the interaction of thermal stress and phase change response will also produce local phase change, leading to a decrease in strength. At this time, the brake surface crack will continue to expand, leading to cracking phenomenon.

3. Cause analysis of bottom failure

In the automobile brake drum does not appear under the premise of cracking and direct cracking, this is the bottom failure, it will lead to the brake drum direct failure. Specifically, it also includes two points: firstly, the brake drum material strength is not good, secondly, under the action of some unreasonable abnormal external forces, the brake drum will also be affected by torsion force and indirectly occur cracking phenomenon, at this time the brake drum flange layer will appear crack cracking phenomenon, finally causing the bottom problem.

4. Cause analysis of excessive wear and non-wear failure

Excessive wear and non-wear can easily lead to complete failure of automobile brake drum. First of all, excessive wear refers to the fact that the working geometric diameter and wall thickness of automobile brake drum are getting larger and thinner under the influence of frequent braking force, which directly has a negative impact on the braking effect of automobile brake drum. Look at the abnormal wear failure, when the brake drum working face in the shoe and other hard material force S, due to friction contact will appear groove, it is often caused by the unreasonable riveting friction plate, to a certain extent is also caused by the automotive brake drum hardness.