The service life of friction materials (ceramic brake pads) is another important requirement. Depending on the type of friction material and the conditions of use, the requirements are also different. For example, how many kilometers of driving mileage are required for brake pads.
The wear of friction pair is the main reason for the deterioration of braking state. Friction works in the form of dynamic fit, and the material loss of friction surface gradually increases with the increase of the number of uses. When the wear accumulates to a certain extent, the characteristic parameters of dynamic friction pair gradually change and the working capacity is reduced. The wear of other matching parts also affects the wear of friction pairs. For example, the uneven wear of the brake CAM affects the lift of the CAM, which in turn affects the displacement of the shoe until it affects the contact between the friction material and the pair.
Wear depends on the conditions of friction and the state of friction. The friction material is mostly in the form of dry friction, and this friction condition without lubrication is a harsh condition for the friction pair, which will inevitably cause wear and increase the matching gap, and affect the braking performance. And under normal circumstances, the wear of the friction pair is uneven wear, and the wear gap caused by all wear is also uneven, which is prominent on the drum brake. The non-uniformity of friction changes the distribution of brake pressure and increases the non-uniform wear of friction pairs.
In addition, the friction heating of the braking process and the dust of the operating environment into the friction pair will cause the process of driving wear, which is thermal wear, abrasive wear, adhesive wear, fatigue wear and so on play a role at the same time, that is, wear is inevitable. However, the amount and speed of wear can be controlled, because the speed of wear depends on the number and frequency of use, the intensity of use, the use environment and the level of use.
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Post time: Oct-10-2024