Electromagnetic controllable pre-tightening device for mainshaft bearing
A spindle bearing and electromagnetic technology, which is applied in the field of performance control of high-speed spindle rolling bearings, can solve the problems of complex structure, high manufacturing and use costs, and achieve the effects of high control precision, low manufacturing cost, and wide dynamic performance
Active Publication Date: 2015-11-04
XI AN JIAOTONG UNIV
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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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[0018] Below in conjunction with accompanying drawing, the present invention will be further introduced:
[0019] Such as figure 1 As shown, the present invention is an electromagnetic controllable preloading device for spindle bearings, which includes a bearing seat 3 that is set on the main shaft 1 and has an open end. The open end of the bearing seat 3 is provided with a preloading force plate 5. 3 and the pre-tightening force plate 5 can slide axially as a whole; the main shaft 1 is also equipped with an electromagnetic loading plate 8, and the circumferential direction of the electromagnetic loading plate 8 is provided for measuring the axial distance between it and the pre-tightening force plate 5 Displacement sensor 6, electromagnetic loading disc 8 is provided with an annular groove on the end face close to the pretensioning force disc 5, and an electromagnetic coil 9 is arranged in the annular groove, and a bearing end is arranged on the end face of the electromagneti...
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The invention discloses an electromagnetic controllable pre-tightening device for a mainshaft bearing. The electromagnetic controllable pre-tightening device includes a bearing pedestal sleeving a main shaft and having an end opening. The open end of the bearing pedestal is provided with a pre-tightening plate. The main shaft is also sleeved with an electromagnetic loading plate. The periphery of the electromagnetic loading plate is provided with a displacement sensor used for measuring axial distance between the electromagnetic loading plate and the pre-tightening plate. The end face, adjacent to the pre-tightening plate, of the electromagnetic loading plate is provided with an annular groove inside provided with an electromagnetic coil. The end face, opposite to the end face with the annular groove, of the electromagnetic loading plate is provided with a bearing end cover. A rolling bearing is arranged in the bearing pedestal. Controllable current is input to the electromagnetic coil, so that electromagnetic force is generated between the pre-tightening plate and the electromagnetic loading plate and is transmitted to the outer ring of the bearing through the bearing pedestal, so that a pre-tightening force is generated. Through regulating the current amplitude of the electromagnetic coil, the distance between the pre-tightening plate and the loading plate can be changed and required bearing pre-tightening force is obtained. The electromagnetic controllable pre-tightening device provided by the invention is suitable for positioning pre-tightening and constant-pressure pre-tightening of the main shaft bearing.
Description
Technical field: [0001] 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. Background technique: [0002] 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 preload control ...
Claims
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IPC IPC(8): G01M13/04B23B19/02
Inventor 苏文军洪军万少可张进华李小虎邱志惠
Owner XI AN JIAOTONG UNIV