INTERNATIONAL ISO STANDARD First edition Rolling bearings — Damage and failures — Terms, characteristics and causes Roulements. Failure mode ISO Subsurface initiated fatigue. Is this normal Fatigue Failure, how many of you get to see a bearing actually fail. ribo lo gy, the Science fo r Maintenance. Fatigue on Inner Race. Ref.: ISO Rolling Bearings – Damages and Failures – Terms, Characteristics and Causes.
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ISO FALLA EN RODAMIENTOS | Edicson Leonardo Briceño –
Subsequent over-rolling leading to flaking. Reconsider the bearing selection. Countermeasure Reconsider bearing selection cage type and radial internal clearance. Countermeasure Verify and apply correct electrical insulation of the bearing. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
The order of the following illustrations follows the classification of failure modes shown in Figure 1.
Provide for spring preloading if suitable. Countermeasure Use protection devices during transportation. Because of the minute difference in the diameters of the two components, they will have a minute difference in their circumferences and, consequently, when brought into contact at one point by the radial load, will rotate at minutely different speeds.
In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s member body in the country of the requester.
Help Center Find new research papers in: The length of the pattern depends upon the magnitude of the compression and the initial radial internal clearance in the bearing. Scratches and slight indication of fretting corrosion are visible.
BS ISO 15243:2017
Countermeasure Counter vibrations by taking adequate design and insulation measures. These specialized methods are outside the scope of this document. These izo not be mistakenr for electrically caused flutes see 5.
ISO shall not be held responsible for identifying any or all such patent rights. In the following illustrations, typical running path patterns for the most common applications and bearing types are shown.
Log In Sign Up. Bending of the shaft or vibration in connection with a loose mating part can, in a similar case, cause fretting corrosion type wear. Check possible deformation of parts adjacent to the bearing. These methods are summarized in A.
The craters are duplicated on the rolling element and raceway contact surfaces in bead-like procession in the rolling direction see Figure The failure can result from improper assembly or maintenance or from faulty manufacture of the bearing or its adjacent parts.
Remember me on this isl. Avoid excessive forces acting on cage. Countermeasure Check load and mounting conditions. NOTE The running path patterns on the raceways will indicate if outer ring or inner ring is out-of-round.
The flutes are equally spaced. However, it is not always easy to distinguish between causes and characteristics symptoms or, in other words, between failure mechanisms and failure modes.
This happens even if the intensity of the current is comparatively low. Countermeasure Check load conditions and lubrication. The running path pattern is widest in the direction of radial loading. The main task of technical committees is to prepare International Standards.
The failure mode terms shown in the subclause titles are recommended for general use. The matrix given in Table A. Countermeasure Choose correct fit taking load and operating conditions into consideration.
Countermeasure Use a bearing with higher load-carrying capacity if longer life is required. Depending on the intensity of the vibrations, the lubrication conditions and load, a combination of corrosion and wear occurs, forming shallow depressions in the raceways.
BS ISO – Rolling bearings. Damage and failures. Terms, characteristics and causes
Adobe is a trademark of Adobe Systems Incorporated. Subsequently the formation 152443 corrosion pits occurs and finally flaking of the surface see 115243 This type of damage generally occurs izo the radial load on the bearing rotates relative to the bearing ring and the bearing ring is mounted with a very small clearance loose fit to 152433 seating. Do not transmit mounting forces through the rolling elements. Countermeasure Apply suitable mounting tools and procedures.
Typically this can occur in two different ways: Running path pattern uniform in width, wider than in Figure A. Running path pattern widest in the load direction, tapering towards the ends and positioned in the middle of the raceway. The work of preparing International Standards is normally carried out through ISO technical committees.
Running path patterns uniform in width, positioned in the middle of the raceways and extending around the entire circumference of the raceways.
Countermeasure Select a bearing execution that is adapted isi the application conditions. Eliminate misalignment or select a bearing type suitable to accommodate the misalignment. Important factors necessary to find the causes of failure may be lost if the procedure selected is incorrect. Flutes will develop from the craters in time, as shown in Figure Observe utmost cleanliness during mounting.
Cracks usually appear at right angles to the direction of sliding see Figure Countermeasure Improve the sealing and use grease or oil with good rust-inhibiting property.