Bearing pre-tightening device

A technology of pressing device and bearing, applied in the direction of bearing element, shaft and bearing, rigid bracket of bearing component, etc., can solve the problems of complex structure and large installation workload, etc.

Inactive Publication Date: 2019-03-22
AECC COMML AIRCRAFT ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a bearing preloading device in order to overcome the defects of the traditional axial preloading device of the bearing in the prior art such as complex structure and heavy installation workload.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a structural schematic diagram of the bearing pretensioning device of the present invention. figure 2 It is a structural schematic diagram of the elastic element in Embodiment 1 of the bearing pretensioning device of the present invention.

[0033] Such as figure 1 and figure 2 As shown, the present invention discloses a bearing pretensioning device 10 , which includes a bearing seat 11 , two bearings 12 and a shaft sleeve 13 . Wherein, the bearing 12 is installed in the bearing seat 11, and is installed on the shaft 14 through the shaft sleeve 13, so that the bearing 12 is axially positioned. At the same time, a compression device 15 is provided on the bearing seat 11, and the outer ring of the bearing 12 is compressed by the compression device 15. An elastic element 16 is arranged between the two bearings 12, and the elastic element 16 is deformed under pressure to compress the outer ring of the bearing 12. The outer ring of the bearing 12 applies...

specific Embodiment

[0037] For example, the specific dimensions of the elastic element 16 can be set as an outer diameter of 158mm, a width of 28mm, a material elastic modulus E of 2E11Pa, and a Poisson's ratio of 0.3.

[0038] One of the advantages of this structure is that the stiffness can be adjusted by adjusting the cross-sectional area of ​​the spring wire, the bending structure of the spring wire, and the number n of the spring wire without changing the main dimensions of the structure.

[0039] Through the finite element method and Hooke's theorem, the stiffness of the elastic element can be calculated, and the calculation result is:

[0040] The number of spring wires is n=3, when the section of the spring wire is 2mm×8mm, the stiffness is 2.6E6N / m;

[0041] The number of spring wires is n=54, when the spring wire section is 2mm×8mm, the stiffness is 4.67E7N / m;

[0042] The number of spring wires is n=54, when the section of the spring wire is 4mm×8mm, the stiffness is 6.69E8N / m;

[00...

Embodiment 2

[0046] image 3 It is a structural schematic diagram of the elastic element in Embodiment 2 of the bearing pretensioning device of the present invention.

[0047] Such as image 3 As shown, the structure of this embodiment is basically the same as that of Embodiment 1, the difference is that: the elastic wire 162 of the elastic element 16 in the bearing pretensioning device of this embodiment is in a "W" shape. Or, on this basis, the elastic wire 162 can also be arranged in a continuous wave shape.

[0048] The elastic element of this one-piece cage structure occupies less space, is easy to install, and has a wide range of stiffness, which can generate a wide range of axial force and realize the application of bearing preload. It is suitable for multiple bearings with different deformation and preload. kind of occasion.

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PUM

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Abstract

The invention provides a bearing pre-tightening device. The bearing pre-tightening device comprises a bearing seat, two bearings and a shaft sleeve; the bearings are installed inside the bearing seatand are installed on a shaft through the shaft sleeve; the bearings are axially positioned; the bearing seat is provided with a pressing device; the pressing device is used for pressing an outer ringof each bearing; an elastic element is arranged between the two bearings; the elastic element is deformed after being stressed so as to press the outer ring of each bearing, and thus each bearing isapplied with pre-tightening force. The bearing pre-tightening device provided by the invention comprises an integrated elastic element which is simple in structure and convenient to install; moreoverthe elastic element has the characteristic of wide rigidity range; and the bearing pre-tightening device can be used for applying various different pre-tightening force by designing various differentrigidity.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to a bearing pretensioning device. Background technique [0002] In all kinds of rotating machinery, including aeroengines, rolling bearings are used in a wide range of applications. In order to prevent unstable rotor operation caused by large bearing clearance, reduce rotor vibration, and prevent bearing damage caused by light-load slipping of rolling bearings, it is usually necessary to apply preload to rolling bearings. However, in the prior art, wire springs, disc springs, etc. are usually used to apply axial pre-tightening force. [0003] The traditional wire spring has only one elastic wire, and the stiffness of the spring is weak, which does not satisfy the situation of applying a large pre-tightening force, and it is often necessary to design a spring seat, which makes the structure more complicated. Another common type of spring is the disc spring, which is stiffer and can app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C35/06
CPCF16C35/061
Inventor 马会防曹冲黄威
Owner AECC COMML AIRCRAFT ENGINE CO LTD
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