Bidirectional pressure regulating pre-tensioner for electric spindle angular contact ball bearing

A technology for angular contact ball bearings and motorized spindles, applied in the directions of shafts and bearings, bearing assembly, bearing components, etc., can solve the problems of high manufacturing and maintenance costs, complex structure, limited application scope, etc., to ensure rotation accuracy and rigidity, The effect of constant axial preload, increasing schedule and service life

Inactive Publication Date: 2013-07-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional constant pressure preloading method can only realize one-way preloading, and the scope of application is limited. With the increase of axial displacement, the preloading force changes significantly, which cannot keep the preloading force constant when the electric spindle is running at high speed, and It is not possible to directly quantitatively display the magnitude of the pretightening force when the spindle is running
There is also a hydraulic preloading method, but its structure is complicated, and the manufacturing and maintenance costs are high.

Method used

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  • Bidirectional pressure regulating pre-tensioner for electric spindle angular contact ball bearing

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Experimental program
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Effect test

Embodiment 1

[0020] The following description will be made in conjunction with the accompanying drawings, but the present invention is not limited to the following examples.

[0021] The device consists of four parts, including: (a) pressure ring, (b) loading sleeve, (c) elastic assembly, (d) bidirectional force sensor;

[0022] (a) The pressure ring and (b) the loading sleeve are connected through a set of M12 left-handed bolts, washers and nuts; (b) the loading sleeve and (c) elastic unit are connected through a set of M12 right-handed bolts, washers and nuts Connection; (c) the elastic unit and (d) the two-way force sensor are connected through a set of M12 right-handed bolts and nuts;

[0023] (a) The pressure ring consists of bearing outer ring support sleeve (1), bearing sealing ring (2), thrust ring (3); the bearing outer ring support sleeve (1) can slide axially with the bearing housing, and the bearing outer ring The ring support sleeve (1) is set on the outside of the angular co...

Embodiment 2

[0034] Description will be made below in conjunction with the accompanying drawings.

[0035] Axial compressive preload is required for angular contact ball bearing sets. according to figure 1 In the connection method shown, the hexagonal sleeve 5 is rotated to draw the pressure ring and the elastic unit closer to generate axial pressure preload, and the pressure value displayed by the sensor 11 is checked to accurately preload the bearing.

[0036]At this time, (a) the bearing sealing ring 2 in the pressure ring withstands the bearing outer ring and drives the bearing outer ring to move away from the shaft end, and axial slip occurs between the outer ring support sleeve 1 and the bearing support seat. The bearing seal ring 2, the thrust ring 3 and the outer ring support sleeve 1 synchronously generate an axial leftward displacement. In the elastic unit, the pull rod 9 is close to the extension spring sleeve 8 and does not bear axial force, and the pressure rod 12 and the co...

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Abstract

The invention relates to a bidirectional pressure regulating pre-tensioner for an electric spindle angular contact ball bearing and belongs to the field of mechanical design and manufacturing. The bidirectional pressure regulating pre-tensioner comprises a pressure ring (a), a load-adding sheath (b), an elastic element (c) and a bidirectional force sensor (d), wherein the pressure ring is formed by a bearing outer ring supporting sleeve, a bearing sealing ring and a thrust ring; the load-adding sheath consists of a left-handed stud, a hexagonal sleeve and a right-handed stud; and the elastic element consists of both left and right fixed plates, two tension spring sleeves which are symmetrically distributed, two pull rods which are symmetrically distributed, four compression springs, two pressure rods which are symmetrically distributed, and two pressing sleeves which are symmetrically distributed. The bidirectional pressure regulating pre-tensioner realizes bidirectional quantitive constant-pressure pre-tensioning on a bearing pack, can ensure that an axial pre-tensioning force of the bearing pack is constant when the electric spindle bearing generates axial displacement, ensures rotating accuracy and rigidity of the electric spindle bearing in the high-speed rotating process, also can quantitively regulate the pre-tensioning force and avoids the phenomenon that the bearing is blocked and burnt down due to excessively high heat generation.

Description

technical field [0001] The invention discloses a two-way quantitative adjustable preloading device, which is mainly used for constant pressure preloading of main shaft bearings. The invention belongs to the field of mechanical design and manufacture. Background technique [0002] High-speed precision machining is an important development direction in the field of machinery manufacturing, and the electric spindle is the core functional component of high-speed machining machine tools. The electric spindle angular contact ball bearing adopts constant pressure preload to achieve various effects such as increasing bearing stiffness, reducing bearing vibration, improving shaft rotation accuracy, and reducing rolling element revolution slipping. Constant pressure preload refers to the axial preload of the bearing An axial preload method that remains unchanged during use, and a certain amount of preload is obtained by adjusting the compression of the spring. [0003] The traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B19/02F16C41/00
Inventor 蔡力钢杨勇卓旭赵永胜刘志峰
Owner BEIJING UNIV OF TECH
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