Limit Speed of NSK Bearings

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The limit speed of NSK bearings is influenced by several factors. These include the stability and strength of the cage design, the smoothness of the cage guide surfaces, the centrifugal and reversing forces acting on the rolling elements, and the overall manufacturing precision. Other factors that may affect the bearing’s maximum speed include the type of seals used in sealed bearings, the quality of the lubricant, and the efficiency of heat dissipation. Laboratory testing and field experience have shown that maintaining the operating temperature of a bearing within acceptable limits can be costly and complex. As a result, there is a practical upper limit to how fast an NSK bearing can operate under normal conditions. The limit speeds listed in the product catalog are typically based on bearings that use the standard cage design. If a higher speed is required than what is specified, it may be necessary to enhance certain limiting factors such as rotational accuracy, cage structure, surface finish, and cooling methods. For detailed guidance, it's recommended to consult with a bearing expert or engineer. In cases where grease is used as a lubricant, additional considerations come into play. The condition of the cage guide surface and the shear strength of the lubricant are critical. These properties depend largely on the base oil and thickener used in the grease. Some open ball bearings may have very low internal friction, which could allow their reference speed (as listed in the product data) to exceed the actual limit speed. In such situations, it's important to compare both the reference speed and the calculated limit speed, and use the lower value for safe operation. It's also important to note that NSK bearings must be subjected to a minimum load when operating at high speeds. Without this, the bearings may not function properly or could suffer premature wear.

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