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

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

Fig. 31 Viscosities of several lubricants for ball and roller bearings, as related to operating speed and temperature. Source: Ref 14 More

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

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

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

Fig. 31 Setups for microhoning (a) ball bearing races and (b) roller bearing races More

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

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

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

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

Fig. 20 Spalling damage on the end of a shaft that served as roller-bearing raceway. The spalling was initiated at subsurface inclusions. More

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

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

Fig. 4 Schematics of typical radial roller bearing configurations. (a) Cylindrical roller elements. (b) Cross section of a tapered roller bearing. (c) Typical configuration of a radial spherical roller bearing. (d) Radial needle roller bearing with machined ring for the cage. (e) Radial needle More

Fig. 6 Radial cylindrical roller bearing with guide flanges (shoulders) on both inner and outer rings. Note that the absence of a rib on one side usually allows thermal dilatation in this direction, the orientation of mounting and combination with other bearings then having great importance. More

Fig. 17 Tapered roller bearing (cutaway view). Courtesy of D. Huffman, The Timken Company More

Fig. 11 Some examples of DLC-coated roller bearing components. Photo courtesy of The Timken Company More

Fig. 2 Tapered roller bearing 24 in. radial and thrust load machine. Source: Ref 19 More

Fig. 2 Tapered roller bearing nomenclature. Note: The blue arrow indicates the inner seal wear ring position; the journal is colored blue for clarity. Source: Ref 1 More