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Failure Analysis

State of Damage

State Description

Causes

Countermeasures

Discolored inner ring raceway, rolling elements and cage due to temperature rises and the reaction of lubricant

Poor lubrication
Lubricant dissolves at high temperature to stain raceway surface
Sharp rise in temperature

Improve lubrication

Axial lines on the raceways and rolling surfaces due to improper installation and dismounting

Inner ring and outer ring misalignment during installation and dismounting
Impact load during installation and dismounting

Use appropriate tools
Use press machine to prevent impact load
Mutual center alignment during installation

Rusting and corrosion of the bearing includes: crater rust of the raceways, rolling element surface, pear skin shape rust, crater rust of the same space distance with rolling element, comprehensive rust and corrosion

Intrusion of water or corrosive material (lacquer, gas)
Inappropriate lubricant
Water-drop due to condensing of water vapor
Stall at high temperature and moisture
Improper anticorrosion during transportation
Inappropriate storage

Improve sealing
Improve lubrication
Improve anti rust measures and storage methods
Pay special attention during use

Inner ring, outer ring, rolling element and retainer discoloration softening, deposits and breaking due to drastically temperature rises during operation

Poor lubrication
Over speed
Clearance is too small
Intrusion of water and foreign particles
Poor precision of shaft and housing, large deflection of the shaft
Overload

Improve lubrication
Select proper bearings
Proper fitting practice, bearing clearance and preload
Improve sealing
Adjust the precision of the shaft and housing
Improve installation method

Creeping refers to the relative sliding motion between the fitting surfaces when there is clearance between them
It appears as excessive polishing on the fitting surfaces which have the creeping motion, sometimes there is scoring

Insufficient interference or clearance fit
Loose fastening of adapter sleeve

Check the interference and implement locking measures
Fasten adapter sleeve
Check the shaft and housing precision
Axial preload
Fasten the end face of the bearing
Glue the fitting surface to avoid creeping
Coat lubricant on the fitting surfaces

Wear caused by vibration and shaking between rolling elements and raceways propagation into false Brinelling

Vibration, shaking and small amplitude swings during bearing transportation
Poor lubrication

Fix the location of the bearing and shafts during transportation
Separate the bearing inner ring and outer ring package during transportation
Preload the bearing reduce the vibration
Use appropriate lubricant

Wear caused by repeated mutual minute sliding between two contact surfaces
Occurs at the contact surfaces between the raceways and the rolling elements
Produces bronze or black wear powder, so also called fretting wear corrosion

Poor lubrication
Swing motion of low amplitude
Insufficient interference

Use appropriate lubricant
Preload
Check the interference
Coat fitting surfaces with lubricant

By wear, it means the friction leads to wear at the raceway or the roller end face, ring end faces and cage pocket

Foreign material enters
Development caused by etching or corrosion
Poor lubrication, rolling element skidding caused by irregular movement

Improve seal
Clean the housing
Thoroughly filter the lubricating oil
Improve the lubricant and lubrication method

Denting on the raceway or rolling surfaces due to the metal powder, foreign particles
Roller spaced indents (true Brinelling) caused by incorrect handling or shock load

Foreign particles such as metal powder
Impact load during assembly or transportation
Excessive load

Clean shaft and housing
Improve seal
Filter the lubrication oil
Improve installation and use methods

By scratch, it means surface damage caused by collection of tiny burns resulting from skidding and oil film hot breaking on the raceway or rolling path
Produce rough surface with hot sticking

High-speed light load
Acceleration and deceleration
Impropriate lubricant
Water ingress

Improve preload
Adjust bearing clearance
Use lubricant with good oil film property
Improve lubricating method
Improve seal

By pinching, it means accumulation of parts of the tiny burns on the gliding surface leads to surface damage
Linear scars of the circumferential direction of raceways and rolling surface
Axle toroidal pendulum scar on roller end surface
Pinching at the rib face contacted with roller end face

Overload, excessive preload
Poor lubrication
Foreign particles
Inner and outer rings misalignment, shaft deflection
Poor precision of axle and bearing box

Check the bearing load, adjust bearing selection
Appropriate preload
Improve lubricant and lubricating method
Check the shaft and housing precision

Fish scale flaking on the raceways or rollers due to fatigue during bearing rotating under load

Overload, improper installation, load moment
Intrusion of foreign particles, water entering
Poor lubrication, inappropriate lubricant
Inappropriate bearing clearance
Poor precision of housing, uneven rigidity of housing, shaft has large axial deflection
Rusting, etching pit, scratching and brinelling
False Brinelling further development

Check the bearing load, adjust bearing selection
Improve installation method
Improve seal device, antirust while machine halt
Use lubricant with adequate viscosity, improve lubrication method
Check the shaft and housing precision
Adjust clearance

Bearing Installation

Bearing Maintenance

Bearing Clearance

Failure Analysis

Send Us a Message

Contact

Address: No.8 Rongyang Yi Road, Xishan Economic Development Zone, Wuxi, Jiangsu
E-mail: twbinfo@twb.com.cn

Copyright © 2011-2023 Jiangsu TWB Bearings Co., Ltd. All Rights Reserved

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