Basic Knowledge for Using Bearings Safely

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Text of Basic Knowledge for Using Bearings Safely

  • This is all you need to know!

    Basic knowledge for... Basic Using bearings safely!

    35

    Causes Foreign matter andcorrosion acting as lappingagent.

    Insufficient or incorrectlubricant.

    Countermeasures Improve sealing.

    Clean shaft and housing. Check lubricant for typeand amount.

    (8) Excessive WearAbnormal wear of flange face, rolling element and retainer.

    Causes Improper storage, cleaning.

    Improper washing oil. Poor rust prevention. Corrosive gas, liquid orwater.

    Handling with unprotectedhands.

    Chemical action oflubricant.

    Countermeasures Improve storage andhandling.

    Re-check washing oil. Review rust prevention. Improve sealing.

    Correct handling.

    Check lubricant.

    (9) Rusting, CorrosionRusting and corrosion of bearing ring and rolling element surface.

    Causes Insufficient interference. Insufficient tightenedsleeve.

    Insufficient surfacepressure due to low rigidityand inaccurate shaft andhousing.

    Countermeasures Check fits. Tighten sleeve.

    Redesign for greaterrigidity.

    (10) CreepGalling, wear, sliding and discoloration of fit face.

    2005.05.Y-ABE-ABE

    CATALOG NO. B3003E

  • 1Introduction

    Thank you for using NACHI bearings and supporting our company.This booklet provides the basics in bearing (rolling bearing) usage that you should be awareof prior to use.As you know, a bearing supports the rotating members of a machine, complex or simple,and has a wide range of uses, from household appliances to large machinery and equipment.For decades, the standardization of bearings has progressed, and bearings have becomefamiliar objects in our daily lives. Nevertheless, a bearing is an extremely fine and precisepart that requires proper handling and usage.Having good knowledge on the advantages and disadvantages of bearings, proper, safeusage, and daily cautions will allow you to take full advantage of their uniquecharacteristics.The booklet summarizes basic information on bearings for those who are already using abearing as well as those who are planning to use them in the future.Please read this booklet carefully, as it provides instructions for safe operation and how toget the longest use out of a bearing. For more detailed information, please contact NACHISales Division.

  • 2Contents

    Chapter 1: What are bearings? 6

    1-1 Structure of Bearings ................................................61-2 Bearing Types and Features ....................................61-3 Radial Bearings and Thrust Bearings ......................8

    Chapter 2: Three Conditions to Maximize the Use of Bearing Capabilities 9

    2-1 Fitting the Bearing with the Shaft and Housing ......9(1) Selecting the Fit ................................................................9

    2-2 Internal Clearance of a Bearing ..............................102-3 Lubrication of Bearings ..........................................11(1) Lubricating Oil ..................................................................12

    1Amount of Oil ..........................................................................132Oil Changing Intervals..............................................................13

    (2) Grease ..............................................................................131Amount of Grease....................................................................142Grease Relubrication Intervals ................................................14

    Reference: Limiting Speed of Bearings ..........................15

    Chapter 3: From Installation to Daily Care of Bearings 16

    3-1 Bearing Storage and Transportation ......................16(1) Bearing Storage ..............................................................16

    (2) Bearing Transportation ....................................................16

    3-2 Bearing Installation..................................................17(1) Working Environment ......................................................17

    (2) Handling of Bearings........................................................17

    (3) Checking the Shaft and Housing ....................................18

    (4) Bearing Installation ..........................................................191Preparations prior to Installation ..............................................192Checking the Shaft and Housing ............................................203Unpacking the Bearing ............................................................204Mounting to the Shaft ..............................................................225Applying Lubricant ..................................................................25

  • 33-3 Test Operation ........................................................263-4 Daily Care of Bearings ............................................28

    1Bearing Sound ........................................................................282Vibration on Machinery and Equipment ..................................293Temperature ............................................................................294Lubricant ..................................................................................295Electric Current Draw ..............................................................29

    Chapter 4: Removing Bearings 30

    (1) How to Proceed with Removal of Bearings ....................30

    (2) Typical Methods of Removing Bearings ........................301Using a Press ..........................................................................302Using a Puller ..........................................................................303Using a Special Wrench (removal sleeve) ..............................314Using Oil Injection ....................................................................315Using Induction Heating ..........................................................31

    Chapter 5: What to Do with Bearings in the Following Situations 32

    1Premature Flaking....................................................................332Seizure ....................................................................................333Breakage..................................................................................334 Indentation ..............................................................................345Fretting ....................................................................................346Scoring ....................................................................................347Smearing..................................................................................348Excessive Wear ......................................................................359Rusting, Corrosion ..................................................................350Creep ......................................................................................35

  • 4The following precautions should be followed in order to protect users and property from injury and severedamage.

    The following show the degree of possible injuries and damages when bearing is used incorrectly andinattentively.

    Safety Precautions

    Imminent danger of death or serious injury Danger

    Possible danger of death or serious injuryWarning

    Possible injury or possible material damageCaution

    The following signs show the meanings described below.

    Always enforced

    Forbidden

    Caution

    Catalog Reference

    5

    Caution

    Do not attempt to disassemble to modifya bearing as it can lead to prematurefailure or equipment damage.

    Do not allow water, metal pieces ordirt to enter the inside of bearings asit can cause damage to bearings.

    Confirm that a lubricant is present inthe bearing. Lack of a lubricant maygenerate heat, cause the bearing toseize and damage the bearing.

    Store bearings under the followingenvironment. Cool, dark area that is free of directsunlight

    Dry area free of moisture Clean area free of dirt An area of 30 cm above the floor

    Use the proper tools to install orremove bearings. Use a clean clothto wipe off the tools and check themfor crack, sharp edge, breakage,chipping or deformation prior to use.

    Be sure to conduct the dailyinspection of a bearing.[Items to be Inspected] Vibration or Sound Temperature Condition of Lubricant (Change incolor or Viscosity, Presence ofForeign Materials)

    Amount of Lubricant Amperage of Drive Motor

    Always operate bearings below theallowable rotating speed.Use of bearings over their allowablerotating speed can cause damage due toexcessive heat generation and seizure.

    If the operational temperatureexceeds 100C, replenish thebearing with proper amount oflubricant two to three times a year.

    Large, heavy bearings must betransported with forklifts or hoists.

  • 5Caution

    Do not attempt to disassemble to modifya bearing as it can lead to prematurefailure or equipment damage.

    Do not allow water, metal pieces ordirt to enter the inside of bearings asit can cause damage to bearings.

    Confirm that a lubricant is present inthe bearing. Lack of a lubricant maygenerate heat, cause the bearing toseize and damage the bearing.

    Store bearings under the followingenvironment. Cool, dark area that is free of directsunlight

    Dry area free of moisture Clean area free of dirt An area of 30 cm above the floor

    Use the proper tools to install orremove bearings. Use a clean clothto wipe off the tools and check themfor crack, sharp edge, breakage,chipping or deformation prior to use.

    Be sure to conduct the dailyinspection of a bearing.[Items to be Inspected] Vibration or Sound Temperature Condition of Lubricant (Change incolor or Viscosity, Presence ofForeign Materials)

    Amount of Lubricant Amperage of Drive Motor

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