NTN bearing information and the cause of overheating

**NTN Bearing Information and the Causes of Overheating** Home > Bearing Knowledge > NTN Bearing Information and the Cause of Overheating Source: Bearing Network | Time: September 8, 2013 --- NTN bearings are widely used in various industrial applications due to their high performance and reliability. However, overheating can occur, which may lead to reduced efficiency or even failure. Understanding the causes of overheating is essential for proper maintenance and long-term operation. One key factor that contributes to overheating is improper compatibility between the shaft diameter and the bearing bush. Ensuring a smooth fit is crucial to prevent seizure and excessive friction. Several factors influence this compatibility: - The metallurgical properties of the materials used. - The affinity between materials and lubricants. - The friction coefficient between surfaces. - The microscopic structure of the materials. - Thermal conductivity. - Surface characteristics and oxide layer formation. Another important aspect is the clamping ability of the materials. Soft materials tend to clamp harder particles more effectively, preventing scratches and wear. For metal components, lower hardness and elasticity improve clamping, while non-metallic materials like carbon graphite may not perform as well. The running-in process also plays a role in reducing initial wear. During this phase, surface imperfections are minimized, leading to better contact and lower friction. This improves the overall performance and longevity of the bearing. Additionally, the material’s ability to withstand fatigue under cyclic loading is critical. Factors such as strength, hardness, and uniformity of the material significantly affect its resistance to fatigue damage. Corrosion resistance is another vital property. Lubricants can oxidize over time, creating acidic substances that may damage the bearing. Therefore, NTN bearings must be made from materials that can resist corrosion. Cavitation resistance is also important, especially in liquid environments. When bubbles collapse near the bearing surface, they can cause damage through high pressure or temperature. Materials like copper-lead alloys and tin-based bearing alloys are known for their good cavitation resistance. Compressive strength ensures that the bearing can handle unidirectional loads without deforming or failing. Overheating in NTN bearings can also result from issues such as: 1. Inadequate or contaminated grease. The grease should not exceed 70% of the total volume, and any impurities should be removed immediately. 2. Incorrect fit between the shaft and the bearing. If too tight, the shaft may need to be ground; if too loose, it should be adjusted. 3. Improper cooperation between the bearing and the end cap. Machining may be required if the fit is too tight, or a steel sleeve may be added if it's too loose. 4. Poor installation of motor caps or bearing covers. Ensure they are properly aligned and tightened. 5. Excessive belt tension or improper coupling alignment. Adjusting the axial clearance can help. 6. Damaged imported bearings. It is advisable to replace them with new NTN bearings. By addressing these factors, you can significantly reduce the risk of overheating and extend the life of your NTN bearings. --- **Related Bearing Knowledge** How to Identify Bearing Descriptions on Centrifugal Compressors That Cannot Be Read by Conventional Methods Features and Uses of Tapered Roller Bearings This article is linked from http:// Please credit China Bearing Network at http:// Previous: Disposal of SKF Bearing Temperature Too High Next: Bearing Working View

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