Small high-speed constant-pressure prepressing apparatus of main bearing

A high-speed spindle, constant pressure preload technology, applied in the direction of metal processing equipment, etc., can solve the problems that affect the stiffness and fatigue life of the shaft system, affect the stiffness, load capacity and high speed of the machine tool spindle system, and affect the fit clearance. Large sliding contact area, high support rigidity, and the effect of avoiding jamming

Inactive Publication Date: 2008-02-13
ZHEJIANG UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

When the main shaft rotates at high speed, the unbalance caused by the multiple threads or grooves on the main shaft for fasteners will directly affect the stiffness and fatigue life of the shaft system, and when the outer ring of the bearing slides axially in the sleeve, the bearing Heat generation will affect the fit clearance and produce axial elongation and deformation, which in turn will affect the stiffness, load capacity and high-speed performance of the machine tool spindle system. Therefore, it is necessary to study more reasonable preloading methods and structures to apply to the spindle system of small high-speed machinery

Method used

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  • Small high-speed constant-pressure prepressing apparatus of main bearing
  • Small high-speed constant-pressure prepressing apparatus of main bearing

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention includes a first bearing 1 and a second bearing 11 placed in the holes at both ends of the shaft sleeve 10, the main shaft 8 is contained in the first bearing 1 and the second bearing 11, A shaft end nut 12 positions the main shaft 8 and the second bearing 11 in the sleeve 10 . There is also a bushing 9 inside the bushing 10, the outer edge of one end of the bushing 9 is stuck in the stepped hole of the bushing 10 and pressed and positioned by the outer ring of the second bearing 11, the other end of the bushing 9 is equipped with a spring seat 4, The spring 5 is placed in the spring seat 4, one end of the spring seat 4 is against the spring retaining ring 6 and the elastic retaining ring 7, the elastic retaining ring 7 is embedded in the sliding sleeve 2, and the sliding sleev...

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Abstract

A constant-pressure pre-fastening mechanism for the bearings of high-speed small mainshaft is composed of shaft sleeve, the first and the second bearings in both end holes of said shaft sleeve, mainshaft installed in said the first and the second bearings, nut at one end of the mainshaft for locating the mainshaft and the second bearing in the shaft sleeve, liner sleeve in said shaft sleeve and with one end located and pressed by the second bearing and another end with spring and its hole, the spring retainer ring and elastic retainer ring in contact with the spring holder, and slide sleeve between the first bearing and shaft sleeve for axial compensation.

Description

technical field [0001] The invention relates to a small-sized high-speed spindle bearing constant pressure preloading device. Background technique [0002] In small high-speed processing machine tools, the high-speed running spindle is required to have sufficient rigidity to withstand radial and axial loads. In order to meet the requirements of spindle running accuracy and rigidity, the spindle system needs to have a good dynamic balance, but the spindle is running at high speed. The bearing may be stuck due to heat and deformation of the main shaft, which directly affects the normal work. [0003] The preloading methods adopted by the existing spindle bearings are divided into positioning preloading and constant pressure preloading. The positioning preloading method positions the two bearings in the bearing sleeve. The structure is simple and easy to disassemble. However, if the spindle runs at high speed, the temperature rise of the bearings will It causes axial elongatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B19/02
Inventor 陈文华马子魁刘次近李立新钱萍
Owner ZHEJIANG UNIV
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