Spindle bearing is a very important part for the engine. If the spindle bearing is damaged, the engine can not be used normally. Bearing damage is a common problem in the process of use. According to the understanding of bearing knowledge, the following is to share some common damage forms and corresponding causes of engine spindle bearings, hoping to be of some help to you.

6, guide surface and non-working surface wear

In the critical lubrication state, when two objects in contact with each other move relative to the surface damage, if this process continues, the expansion of the damage will cause surface erosion, resulting in the gradual loss of materials on the working surface, this phenomenon is called wear. FIG. 6 shows the wear morphology of engine bearing cage guide surface.

Bearing wear is likely to occur under special working conditions such as improper assembly, cage resonance and high speed. When the mating is too loose and the pressing nut is not pressed, the mating surface of the ring will rotate relatively, resulting in the wear of the mating surface; When the cage resonates with the guide ring, it will cause serious wear on the guide surface of the cage and the guide ring. Roller bearings with high rotational speed or inverted inner and outer rings are easy to cause roller face wear.

These wear light damage bearing accuracy, heavy in the short term cause bearing failure, should be in the design to prevent the occurrence of such failures.

7, contact corrosion

Contact corrosion is the wear of the material surface on the mating interface, that is, on the inner hole, outer diameter and end face of the bearing. The particles shed and oxidize the contact surface to form a black – red adhesive layer covering part or all of the interface. FIG. 7 shows the typical morphology of contact corrosion.

In the process of use, contact corrosion often occurs on the bearing mating surface and working face, which is mainly caused by the loosening of the mating surface in the working state and the retention of salt (Cl-, etc.) and water (O2- can be decomposed) on the mating surface. The salt mainly comes from the operator’s bare hand touch. In addition, abnormal vibration and overload may also cause contact corrosion.

The influence of contact corrosion on bearing operation mainly includes the wear of mating interface, which leads to the loss of tightness. Spreading corrosive particles, contaminating the lubrication system; Microcracks occur, resulting in fatigue crack propagation, and in severe cases, lead to ring fracture.

Contact corrosion can be effectively prevented by improving the interface tightness of bearing fit, avoiding external pollution and reducing bearing load.

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