What is a preload switching bearing unit and what is its working principle? 

In order to ensure the high rigidity of the shaft and the bearing on the main shaft of the high-rigidity, ultra-high speed, motor-driven machining center, a preload switching bearing unit is installed. Then, what is a preload switching bearing unit and what is its working principle? 

Preload switching bearing unit, as the name suggests, is to apply the most appropriate preload to the bearing. Before, we also shared the knowledge about preload "Why do bearing preload, what are the benefits of bearing preload? ", we know that it is possible to improve the rigidity of the shaft and bearing by preloading, but preloading is like all common sense in daily life, there is a phenomenon of "too much".

Bearing engineers have been thinking for a long time that it would be perfect if the preload can be adjusted in real time according to the operating state of the bearing. Therefore, the preload switching bearing unit was invented, which can operate at any speed. In the specified range, adjust the preload value of the internal bearing. With the support of this bearing unit, the bearing operation system is more reliable and perfect.

As shown in the figure above, the preload switching part located at the rear bearing can adjust the preload amount of the internal angular contact ball bearing by sliding in stages by hydraulic pressure.

At present, preload switching has achieved smooth switching. Due to its high cost, complicated installation and high requirements for engineers, it has not yet become popular, but it is expected that with the advancement of technology and productivity, The preload switching unit will also be gradually simplified and popularized. It is believed that in the near future, it will become a standard component of every group of machine tools.

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