**NTN Bearings: Monitoring and Troubleshooting During Operation**
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Source: Bearing Network | Date: January 14, 2014
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When it comes to maintaining the performance of NTN bearings, regular monitoring and troubleshooting are essential. These practices help identify potential issues early on, ensuring optimal operation and extending the lifespan of the bearing. Below are some key methods for inspecting and diagnosing problems in NTN bearings.
First, listening to the bearing's rolling sound is an effective way to assess its condition. A properly functioning bearing should produce a smooth and consistent sound. If there is any abnormal noise—such as irregular or rough sounds—it may indicate minor damage like surface peeling or wear. This method is simple but highly informative, especially when combined with other diagnostic techniques.
Second, measuring bearing oscillation is a sensitive indicator of internal damage. Issues such as spalling, indentation, rust, cracks, and wear can all be detected through this method. Specialized equipment like frequency analyzers can be used to measure the oscillation levels accurately. By analyzing the data and comparing it against standard specifications, engineers can determine whether the bearing requires maintenance or replacement.
Third, monitoring the temperature of the bearing is crucial. The external temperature of the bearing can provide an initial estimate, but if possible, measuring the outer ring temperature directly gives more accurate results. Typically, the temperature of a bearing increases gradually during the first 1–2 hours of operation and then stabilizes. A sudden spike in temperature may signal a problem, such as insufficient lubrication or excessive load.
Fourth, ensuring proper lubrication is vital for the performance and longevity of NTN bearings. The smooth operation of the bearing significantly affects its fatigue life, as well as factors like friction, wear, and temperature rise. Without adequate lubrication, the bearing cannot function properly. In fact, about 40% of bearing failures are linked to poor lubrication.
Lubrication methods for bearings are generally divided into two categories: grease lubrication and oil lubrication. Choosing the right lubricant depends on the operating conditions, such as speed, load, and temperature. Grease lubrication is often preferred for lower-speed applications, while oil lubrication is more suitable for high-speed and high-temperature environments. Oil circulation can also help dissipate heat effectively.
When selecting grease, it’s important to consider factors like dropping point, oxidation stability, and low-temperature performance. The operating temperature of the bearing should be at least 10–20°C below the dropping point of the grease. For heavy-load applications, a grease with a smaller penetration value is recommended to ensure sufficient film strength.
In high-speed and high-temperature conditions, it’s common to use oil lubrication alongside grease. The circulating oil not only provides lubrication but also helps cool the bearing, reducing the risk of overheating.
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