Analysis of the Lifespan and Limit Speed of Koyo Imported Bearings
Source: China Bearing Network | Date: March 3, 2013
Koyo imported bearings are widely used in various industrial applications due to their high precision and reliability. However, to ensure their long service life and optimal performance, it is essential to understand and properly manage factors such as bearing lifespan, limit speed, and installation practices. **1. Shaft and Bearing Housing Selection and Control** When installing Koyo bearings, it is crucial that the shaft and housing are precisely machined to ensure a proper fit. If the bearing feels stiff or unresponsive after being pressed into place, it may indicate that the shaft diameter is too large or that the roundness of the shaft is not sufficient. Many domestic manufacturers only focus on the surface finish and neglect the importance of controlling the roundness, which can significantly affect bearing performance. Proper control of both the shaft's circularity and its dimensional accuracy is essential for smooth operation. **2. Correct Installation Methods** Proper installation is vital for maintaining the integrity of Koyo bearings. Improper methods, such as hitting the bearing with a hammer, can damage the raceways and reduce the bearing's lifespan. A specialized installation tool should be used to apply even pressure during the process. When pressing the inner ring onto the shaft, only the inner ring should be subjected to force, while the outer ring should be pressed evenly without tilting. Any misalignment during installation can cause uneven loading and potential damage to the bearing. **3. Avoiding Contamination** During the installation process, foreign particles such as metal shavings from dynamic balancing can easily enter the bearing, leading to premature wear. It is best to balance the rotor before mounting the bearings. Some manufacturers use oil or grease to ease installation, but improper application can lead to contamination. It is recommended to avoid applying lubricants directly to the bearing housing unless necessary, and if used, they must be carefully controlled to prevent accumulation inside the housing. **4. Preventing Paint Rust** One common issue with Koyo bearings is paint rust, especially in motor applications. This occurs when insulating varnish emits acidic substances under certain temperature and humidity conditions, causing corrosion. Initially, the motor may appear to function well, but over time, the bearing may suffer severe rusting. To prevent this, it is important to use high-quality insulating paint and allow it to fully dry before installing the bearings. **Understanding Bearing Life and Limit Speed** The lifespan of a bearing is defined as the total number of revolutions or operating hours before any component shows signs of fatigue. The limit speed refers to the maximum rotational speed at which the bearing can operate without overheating due to friction. Exceeding the limit speed can lead to excessive heat generation, damaging the lubricant film and potentially causing the rolling elements to seize or temper. The limit speed values provided in technical specifications are based on ideal conditions, such as proper lubrication, normal cooling, and rigid housing and shaft alignment. If the load exceeds 0.1 times the basic dynamic load rating (C), the contact stress increases, which can reduce the allowable speed. In such cases, the limit speed should be adjusted accordingly. By following these guidelines, users can maximize the service life and performance of Koyo imported bearings, ensuring reliable operation in demanding industrial environments.
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