Single row cylindrical roller bearings for machine tool spindles

The single row cylindrical roller bearing is the key component of the spindle of the machining center. In order to achieve the best distribution of grease in the bearing during grease lubrication, it is necessary to run in for a long time and become the bottleneck to improve production efficiency. In addition, under the condition of oil air lubrication * 1, the bearing temperature rise is too high during low speed operation, which is also an urgent problem to be solved. To solve this problem, although the roller guide mode can be used to stabilize the cage position, it is easy to cause early damage to the cage under excessive load. Therefore, the outer ring guide mode is generally used in the industry.

*1. Air lubrication: a lubrication method in which a small amount of lubricating oil is mixed with compressed air and then injected into the bearing at a high speed

Features of new technologies

1. Shorten running in time of lubricating grease

The rolling body guide cage has been successfully developed, which has the same durability as the existing products. By improving the shape of the cage, the discharge performance of excess grease can be improved. Compared with the general outer ring guide cage, the running in time during grease lubrication can be shortened by up to 70%.

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2. Reduce abnormal temperature rise during oil air lubrication

Under the condition of oil air lubrication, the traditional outer ring guide mode is difficult to solve the problem of high temperature rise caused by excessive lubricating oil retained in the bearing at low speed. The rolling body guide mode can solve the above problems and realize the stable operation of the main shaft under oil air lubrication.

3. Improve the reliability of rolling element guide cage

In view of the easy damage problem of the cage in the rolling element guide mode, the cage material and shape were optimized, and the durability (reliability) of the rolling element guide cage was improved.

Effect of product development

This technology can shorten the assembly time of grease lubricated spindle and improve the production efficiency of machine tool manufacturers. At the same time, it can reduce the abnormal temperature rise during oil air lubrication, improve the strength of roller guide cage, and achieve high reliability.

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