Pit & Quarry, October 2017
MOTORS DRIVES BEARINGS 2 Point surface origin PSO spalling Very high and localized stress generates this type of damage The spalling is typically from nicks dents debris etching and hard particle contamination in the bearing Its the most common type of spalling damage and often appears as arrowhead shaped spalls propagating in the direction of rotation 3 Inclusion origin spalling This damage in the form of elliptically shaped spalls occurs when theres bearing material fatigue at localized areas of sub surface non metallic inclusions following millions of load cycles Due to improvements in bearing steel cleanliness in recent decades encountering this type of spalling is unlikely EXCESSIVE PRELOAD OR OVERLOAD Excessive preload can generate a large amount of heat and cause damage similar in appearance to inadequate lubrication Often the two causes may be confused So it is important to check the bearing thoroughly to determine the root problem A lubricant thats suitable for normal operation may be unsuitable for a heavily preloaded bearing as it may not have the film strength to carry the higher loads EXCESSIVE END PLAY Excessive end play results in a very small load zone and excessive looseness between the rollers and races outside the load zone This causes the rollers to unseat leading to skidding and skewing as the rollers move into and out of the load zone This movement creates scalloping in the cup race and can also cause cage wear MISALIGNMENT Misalignment will shorten bearing life depending on the degree of misalign Experience Knowledge Service Large particle contamination wedged in the soft cage material can result in grooving Rockability Weve got it Rock Solid Solutions Built on Experience Since 1977 Proud Distributor of Aggregate Material Handling Systems 323 Energy Way Bridgeport TX www crispindustries com 8003150871 40 PIT QUARRY October 2017 pitandquarry com
You must have JavaScript enabled to view digital editions.
