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roller bearings

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Published: 31 December 2017
Fig. 5 Crowned roller geometry used in radial roller bearings. (a) Fully crowned (spherical roller). (b) Partially crowned (cylindrical roller). I , r oller length; D , roller diameter; R , crown radius More
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Published: 31 December 2017
Fig. 7 Schematics of thrust roller bearings. (a) Thrust cylindrical roller bearing limited to use with axial loads only, due to its 90° contact angle. (b) Spherical roller thrust bearing, which incorporates asymmetrical rollers that tolerate a misalignment ranging from ±1 to ±3, depending More
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Published: 01 January 2002
Fig. 31 Viscosities of several lubricants for ball and roller bearings, as related to operating speed and temperature. Source: Ref 14 More
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Published: 31 December 2017
Fig. 11 Bearing wear versus time for tapered roller bearings using data obtained with the bearing wear machine. Test parameters: lubricant, SAE 80 EP gear oil with a (13 cSt) viscosity at temperatures of 90 to 100 °C (195 to 210 °F); contaminant, uncut silica dust with concentration of 1000 mg More
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Published: 01 January 1996
Fig. 9 Plot of relative contact fatigue life for tapered roller bearings versus steel cleanness for several steel heats produced by various electric-arc furnace steelmaking practices More
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Published: 01 January 1996
Fig. 11 Plot of relative contact fatigue life for tapered roller bearings versus Λ (the ratio between the minimum elastohydrodynamic film thickness and the root-mean-square roughness of the contacting surfaces) More
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Published: 01 January 1989
Fig. 31 Setups for microhoning (a) ball bearing races and (b) roller bearing races More
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Published: 30 September 2015
Fig. 34 Raw material utilization in the production of a tapered roller bearing race. (a) Produced from hot rolled tube stock. (b) Powder forged from preform. Source: Ref 112 More
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Published: 01 January 2002
Fig. 5 Tapered-roller bearing damaged by electrical pitting. (a) Fluting damage caused by continuous passage of electrical current. (b) A roller from (a) polished on the outside diameter and etched with nital to show the many individual arc marks that led to the destruction of the raceway More
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Published: 01 January 2002
Fig. 7 Low-alloy steel roller bearing from an improperly grounded electric motor that was pitted and etched by electrolytic action of stray electric currents in the presence of moisture. More
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Published: 01 January 2002
Fig. 14 An example of burnup with plastic flow in a tapered-roller bearing. This type of failure may result from loss of lubrication or gross overload. The damage begins as heat generation followed by scoring, and if the lubricant is not replenished or the load reduced, the excessive heat More
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Published: 01 January 2002
Fig. 17 Microspalling (peeling) on a tapered-roller bearing caused by a thin lubricant film compared to the composite surface roughness. (a) Cup showing fatigue on the peaks of surface texture. (b) Cone showing fatigue on the peaks of surface texture. (c) Roller with a general spalled area More
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Published: 01 January 2002
Fig. 20 Spalling damage on the end of a shaft that served as roller-bearing raceway. The spalling was initiated at subsurface inclusions. More
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Published: 01 January 2002
Fig. 24 Drawn-cup needle-roller bearing that failed by gross overload. As the cup increased in width under overload, the oil hole became elongated, and circumferential cracks developed in the outer surface. More
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Published: 01 January 2002
Fig. 25 Bulk damage to a stationary tapered-roller bearing cone resulting from gross impact loading that yielded the cone material and cracked the case-carburized surface. Source: Ref 7 More
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Published: 01 January 1996
Fig. 6 Micropitting of roller bearing outer race. Scanning electron micrograph, (a) 57× and (b) at higher magnification More
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Published: 01 August 2018
Fig. 13 Polar coordinate vision used to inspect roller bearing assemblies by verification of roller placement. (a) Actual machine vision monitor image of two bearing assemblies on a conveyor belt. (b) The first step, requiring <70 ms, is to locate bearing within the image as indicated More
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Published: 31 December 2017
Fig. 11 Some examples of DLC-coated roller bearing components. Photo courtesy of The Timken Company More
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Published: 01 January 1989
Fig. 26 Schematic view of setup for matched-piece lapping roller-bearing cage assemblies into mating outer races More
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Published: 01 January 2005
Fig. 4 Examples of contour ring shapes. (a) Roller bearing inner race. (b) C-shaped ring More