Heavy Duty Needle Roller Bearings
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Pitchlign > , TJ TandemRoller > ή , Inner Rings Heavy Duty Needle Roller Bearings > High load capacity, long life, caged roller bearings in standard configurations and custom designs RBC Divisionwww.rbcbearings.com800.390.3300 size="-2">

RBC Bearings Incorporated (RBCBearings, 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. > Heavy Duty Needle RollerBearings - Pitchlign RBC produces an extensive heavy duty needle roller bearing product line from 1 inch outer ring OD to 12.125 inch outer ring OD. RBC heavy duty needle roller bearings...

Precision Ground Heavy Duty Needle Roller Bearings2 - 7Precision Ground Heavy Duty Needle Roller Bearings with Seals8 - 9Inner Rings for Precision Ground Heavy Duty Needle Roller Bearings10 - 12TandemRoller > Bearings Η TJ, DTJ Series13 - 15Technical Data16 - 17Typical Applications18 - 19Pitchlign > Roller Bearing Interchange Tables20 - 25Pitchlign > ή Application Sheet26 - 28Custom Designed Bearings29Other RBC Bearings ProductsBack Cover > 1 size="-1">

The RBC TJ TandemRoller > Bearing > What more capacity will do: Increasing the number of rollers The Tandem Roller Bearing(TJ-series) solutions. Full complement of rollers 13 size="-2">

The methods, equations, and technical data presented in this section should be sufficient toselect 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 bearingdesign, specifically tailored for optimum performance. > DYNAMIC CAPACITY C [lbf,N], or basic load ratingӔ for a roller bearing is that...

2.2.1 Raceway Hardness The capacities given in the dimensional table are valid only if all load carrying bearingcomponents 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 andstatic capacities must be reduced by factors given in table 1. A hardness of less than HRc 40 is not recommended.The adjusted bearing capacities C and CҒ > O becomeAdjusted...

2.4 Adjustments to Fatigue Life If bearing design and operation deviate significantly from normal, it may be necessary to useadditional factors to estimate the fatigue life L > na L > na = a > 1 * a > 2 * a > 3 * L > 10 (7) where L > na = adjusted rating life [hrs, rev]a > 1 = reliability factor (see table 2)a > 2 = material factora > 3 = user operating factor > Reliability %L n Reliability Factor a 1 90L 10 195L 5 0.6296L 4 0.5397L 3 0.4498L 2 0.3399L 1 0.21 Table 2. Reliability Factors, a 1 The materials and bearing technology factor a > 2 = 1 for standard bearings. Adjustment factora > 3...

If the bearing is subject to repeated shock or impact loads, the equivalent load P > e or itsindividual 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. LoadingShock Load Factor Uniform and constant1.00Variable and light shock1.50 Vibration and moderate shock2.00 Heavy and severe shock3.00 > Table 3. Load Modification Factors The limiting speed values in the dimensional tables apply to bearings lubricated with oil ofproper viscosity,...

Due to lower stiffness, bearing inner and outer rings usually conform to the shape of shaftand 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 application.The bearing operating clearance should be checked in cases where both inner and outer ringsare 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 meetat least the minimum requirements for rolling...

n as a percent of limiting speed n In those cases where the lubricants primary function is to protect the bearing from con-tamination, 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...

Hoist Drum Shaft The long slender shaft of such anapplication is another point with inherent misalign- ment and deflection. Pitchlign > ׮ bearings are indi-cated to maintain its free-rolling, high capacity opera- tions under adverse conditions. Sheave Blocks Crownblocks and traveling blocks of portable drilling equipment use Pitchlign Pumping Units ח Center iron and equalizer applica-tions, with oscillating service is best served by Pitchlign > bearings. With the properly controlled and spaced rollers, creepage of the rollers and cage occur to mini- mize fretting corrosion and friction...

Paper Converting Machines To maintain todayגs fabu-lous output of paper converting machinery, Pitchlign Gear Pumps Higher pressures and speeds of todayגsefficient gear pumps, more than ever demand an individu- ally controlled roller design of a bearing such as Pitchlign > ή .The deflection due to the high internal hydraulic loading, together with the inherent problem of alignment cannot be taken care of by any other type bearing. bearings are used on the eccentrics and main bearings of paper punch presses where they withstand speed, heavy impact and shaft deflection. Machine Tools One such...