NTN Bearing Burnout Inspection Analysis and Prevention Methods
NTN bearings are widely used in various mechanical systems, especially in the rear axle drive of vehicles. These bearings are designed to handle complex loads, including torsion, torque, and some impact forces. The main components of the axle are typically made from carbon alloy hardened steel, which undergoes induction hardening. The hardened layer usually has a depth of 4–6 mm with a hardness of 50–55 HRC. However, during the manufacturing process, burnout or overheating can occur, significantly affecting the quality of the bearing and its parts. Burnout in NTN bearings often occurs near the coil area, particularly around the 225-degree position. This is where the fault characteristics tend to appear more frequently. The inspection of such burnout involves identifying the temperature distribution, heat dissipation patterns, and the structural integrity of the induction coils. Heat generation in the induction heating process is not only due to the workpiece but also comes from the primary heat loss in the sensor. There are three main ways that heat is lost: 1. **Radiation to the surroundings**: The magnet is guided, and the induction coil is placed on insulating varnish and fiberglass cloth. This method minimizes heat loss and ensures even heat distribution, resulting in less impact on the sensor. 2. **Cooling water heat dissipation**: Some sensors use cooling water for heat management. Research shows that at temperatures between 0–180 degrees, the cooling water intake is efficient, and the water flows smoothly. However, when the temperature exceeds 180 degrees, the water temperature rises due to the longer flow path, leading to reduced heat exchange efficiency. This can cause localized temperature increases, especially around the 225-degree area, which may result in coil burnout. 3. **Heat conduction through the induction coil plates**: Some plates have low current density and poor cross-sectional area, leading to higher temperatures in specific areas. For example, the induction coil plates located between 0–90 degrees and 270–360 degrees have better thermal conductivity, while those between 90–270 degrees have lower conductivity. This uneven heat distribution can cause certain sections of the coil to overheat and burn. The difference in the appearance of burned coils in these areas is mainly due to variations in the heating current and the thermal properties of the surrounding components.
**Recommended Reading:** - The method of preventing heat treatment deformation in bearings - Classification methods of common rolling bearings - Device and disassembly techniques for bearings - Visual inspection and surface quality assessment of bearings This article was originally published on China Bearing Network. For more information, visit [China Bearing Network](http://www.chinabearing.net). Previous: The demand for SKF bearings in wind energy applications Next: Common terminology and definition of rolling bearings (6)
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