Pitchlign , TJ TandemRoller , Inner Rings ® ® Heavy Duty Needle Roller Bearings High load capacity, long life, caged roller bearings in standard configurations and custom designs RBC Division ISO 9001:2000 www.rbcbearings.com 800.390.3300

RBC Bearings Incorporated (RBC Bearings, RBC) has had a long tradi- tion of innovation, commitment, and quality since the company was founded in 1919. Today, RBC Bearings has grown into a world-class manufacturer of standard and custom-engineered bearings and related products, with a product focus on research, testing, and development of the best product for specific applications. RBC Bearings, with facilities throughout North America and Europe, provides bearings and precision products for applications in the con- struction, mining, material handling, transportation and off-highway equipment,...

Precision Ground Heavy Duty Needle Roller Bearings Precision Ground Heavy Duty Needle Roller Bearings with Seals 8-9 Inner Rings for Precision Ground Heavy Duty Needle Roller Bearings 10 -12 TandemRoller® Bearings — TJ, DTJ Series Technical Data Typical Applications Pitchlign® Roller Bearing Interchange Tables Pitchlign® Application Sheet Custom Designed Bearings Other RBC Bearings Products Back Cover

Available Seal Configurations TYPE—S Single seal mounted in radius end of ring with sealing lip turned outward to exclude dirt. Bearing # SJ — S TYPE—SS Double seal with sealing lips turned outward to exclude dirt. Bearing # SJ — SS TYPE—SR Double seal with one seal mounted in chamfered end with sealing lip turned outward to exclude dirt and one seal mounted in radius end with sealing lip turned inward to retain lubricant. Bearing # SJ — SR TYPE—SX Single seal mounted in chamfered end of ring with sealing lip turned outward to exclude dirt. Bearing # SJ — SX TYPE—R Single seal mounted in radius...

IN SEARCH of MAXIMUM CAPACITY What more capacity will do: The rating life of roller bearings is given by L \ P / where L is the calculated fatigue life, C, the dynamic capacity, and P, the equivalent radial load. It is easy to see that increasing the capacity will increase the fatigue life under the same load conditions, however, the relationship between life and capacity is not To see how life changes with improved capacity and constant load, we calculate a fatigue life ratio jji for 2 different capacity values C2 and C1 using From this relationship or from fig. 1 we can determine for example...

TECHNICAL DATA The methods, equations, and technical data presented in this section should be sufficient to select the correct bearings and estimate their performance for a wide range of applications. For applications with severe or unusual operating conditions, RBC is prepared to provide an in-depth analysis and recommend the most suitable bearing arrangement. Where standard bearings cannot be used, RBC can meet the application requirements with a special bearing design, specifically tailored for optimum performance. 2. Capacity and Fatigue Life of Roller Bearings DYNAMIC CAPACITY C [lbf,N],...

2.2 Adjustments to Bearing Capacity 2.2.1 Raceway Hardness The capacities given in the dimensional table are valid only if all load carrying bearing components are properly heat treated to a minimum hardness of HRc 58. The equivalent strength of material is approximately 300,000 psi. In applications without an inner ring, the shaft becomes an integral bearing component. If one or more bearing components possess a hardness of less than HRc 58, both dynamic and static capacities must be reduced by factors given in table 1. A hardness of less than HRc 40 is not recommended. The adjusted bearing...

2.4 Adjustments to Fatigue Life If bearing design and operation deviate significantly from normal, it may be necessary to use additional factors to estimate the fatigue life Lna Lna = a1 * a2* a3 * L10 (7) where Lna = adjusted rating life [hrs, rev] a1 = reliability factor (see table 2) a2 = material factor a3 = user operating factor Reliability % Ln 90 95 96 97 98 99 Reliability Factor a1 L10 L5 L4 L3 L2 L1 1 0.62 0.53 0.44 0.33 0.21 Table 2. Reliability Factors, a1 The materials and bearing technology factor a2 = 1 for standard bearings. Adjustment factor a3takes into account unusual or extreme...

If the bearing is subject to repeated shock or impact loads, the equivalent load Pe or its individual components should be multiplied by a suitable shock load factor. The product of load and shock load factor should not exceed the bearing static capacity to prevent brinelling of raceways and rollers. Table 3. Load Modification Factors The limiting speed values in the dimensional tables apply to bearings lubricated with oil of proper viscosity operating under low to medium load. Poor cooling conditions, bearing misalignment, and improper diametral bearing clearance will cause the bearing to heat...

Due to lower stiffness, bearing inner and outer rings usually conform to the shape of shaft and housing bore respectively, with little attenuation of taper and out-of-roundness. The quality of user supplied mounting surfaces must therefore be sufficient for the intended The bearing operating clearance should be checked in cases where both inner and outer rings are press fitted or where a large temperature gradient exists between shaft and housing. The user supplied shaft is an integral part of bearings without an inner ring and must meet at least the minimum requirements for rolling element bearings:...

In those cases where the lubricants primary function is to protect the bearing from contamination, the relubrication period must be adjusted to maintain a protective barrier at all times. There are no fixed rules as to how often relubrication should take place, it is strictly a function of the environmental conditions. The harsher the operating conditions, the shorter the relubrication period. A visual examination of the bearings may indicate the need for more grease when much of the grease collar in the seal area has been lost. The maximum recommended quanitity of grease in a roller bearing...