An electromagnetic controllable pre-tightening device for spindle bearings

Abstract

The invention discloses an electromagnetic controllable pre-tightening device for a main shaft bearing, comprising a bearing seat sleeved on the main shaft and having one end open, the open end of the bearing seat is provided with a pre-tightening force plate; the main shaft is also sleeved with an electromagnetic loading plate, The circumferential direction of the electromagnetic loading plate is provided with a displacement sensor for measuring the axial distance between the electromagnetic loading plate and the pre-tightening force plate. An annular groove is formed on the end surface of the electromagnetic loading plate close to the pre-tightening force plate, and an electromagnetic coil is arranged in the annular groove. A bearing end cover is arranged on the end face of the electromagnetic loading plate opposite to the annular groove; a rolling bearing is arranged in the bearing seat. The electromagnetic coil inputs a controllable current, which generates an electromagnetic force between the pre-tightening force plate and the electromagnetic loading plate, which is transmitted to the outer ring of the bearing through the bearing seat to generate the pre-tightening force. By adjusting the current amplitude of the electromagnetic coil, the distance between the preload plate and the loading plate can be changed, and the required bearing preload can be obtained. The invention is suitable for the positioning preload and constant pressure preload of the main shaft bearing.

Description

[0001] Technical field: [0002] The invention belongs to the application field of performance regulation and control of high-speed main shaft rolling bearings, and in particular relates to an electromagnetic controllable pre-tightening device for main shaft bearings. [0003] Background technique: [0004] As the rotating support element inside the high-speed spindle, the service performance of the rolling bearing directly affects the dynamic performance of the high-speed spindle. Therefore, it is very important to adjust the service performance of rolling bearings such as stiffness, temperature, rotation accuracy, and preload in real time to adapt to the complex working conditions of the spindle system. Relevant studies have shown that bearing preload control technology is one of the most effective methods for adjusting bearing service performance. Therefore, for precision machine tools, the preload of the spindle bearing should be controllable online, so as to realize the p...

AI Technical Summary

Problems solved by technology

In terms of pre-tightening force control mechanisms, there are active control mechanisms based on piezoelectric brakes, hydraulic devices, and electrostrictive materials, but there are problems with complex structures and high manufacturing and use costs.

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