A Non-contact Measuring Method of Slip Rate of Aviation Bearing Cage

Abstract

The invention discloses a non-contact measurement method for the slip rate of an aviation bearing cage, which belongs to the field of online condition monitoring of aviation bearings. The method solves the problem that the existing method for measuring the rotational speed of the cage of the aerospace bearing has low measurement accuracy, which leads to low accuracy of the slip rate of the cage. The probe of the weak magnetic detection sensor is located above the outer ring of the aviation bearing, and is hoisted in the through hole of the bearing housing to collect the mixed magnetic field information generated by the rolling elements and the inner ring; due to the actual speed v of the cage c ″ and the actual speed v of the rolling element c ’ are equal, therefore, firstly, the actual rotational speed v c ’, that is: the actual speed v of the cage is obtained c ″, according to the actual speed v of the cage c ″ and the theoretical speed v c Get the slippage ratio of the cage. The invention mainly uses a non-contact method to measure the slip rate of the bearing cage.

Description

technical field [0001] The invention belongs to the field of online state monitoring of aviation bearings. Background technique [0002] Rolling bearings are an important part of rotating machinery, which is related to whether the rotating machinery can run safely and smoothly. Especially for aero-engine bearings, which work in harsh environments such as high temperature, high speed, heavy load and oil mist, when the bearing is working, since the rolling body moves in a circular motion with the inner ring of the bearing, under the action of centrifugal force, the rolling The rolling body often maintains a certain contact with the inner raceway of the outer ring of the bearing, which causes the rolling body to fail to maintain its original position and causes frequent sliding between the inner and outer rings of the rolling body, resulting in a large shear in the contact area cut force. Ultimately, severe friction and associated high heat generation can lead to reduced bear...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the existing method for measuring the rotational speed of the cage of an aviation bearing has low measurement accuracy, resulting in low accuracy of the slip rate of the cage. The present invention provides a non-contact method for measuring the slip rate of the cage of an aircraft bearing.

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