ntn needle roller bearing handbook index needle roller bearings 4 1 1 classification of needle roller bearings 4 1 2 comparison with general bearings 4 1 3 comparison of needle roller and cage assembly bearings and full-complement needle roller bearings 7 1 4 production methods for needle roller bearings 10 1 1 2 3 4 5 6 7 8 9 10 11 2 3 4 characteristics of various series of needle roller bearings 12 2 1 series numbers and bearing names12 bearing selection 26 load rating and life28 bearing life 28 basic rated life and basic dynamic load rating 28 factors affecting bearing life 28 installation error and crowning 29 radial internal clearance surface roughness surface hardness and bearing life 30 4 6 tips for longer bearing life 30 4 7 basic static load rating 30 4 1 4 2 4 3 4 4 4 5 5 fitting needle roller bearings 32 5 1 fitting machined-ring radial needle roller bearings 32 5 2 fitting of drawn-cup needle roller bearings 33 6 shaft and housing design 35 6 1 shaft and housing accuracy 35
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ntn needle roller bearing handbook 1 pressing the bottom collar removal hardening annealing surface treatment tumbler assembly of rollers and cage assemblies curling welding heat treatment hem bending inspection grinding polishing selection washing rustproofing packing 11
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ntn needle roller bearing handbook table 2.7 cam follower category series code cr bearing name cam follower appearance characteristics inch series with cage assembly crv x cam follower inch series full-complement rollers outside surface of outer ring is cylindrical prelubricated with standard grease 3a 2 crv xll cam follower sealed type with cage assembly small-diameter plastic type with t2 is available kr cam follower kr h cam follower with hexagonal hole cam follower sealed type shaft end at head side with hexagonal hole with cage assembly prelubricated with standard grease 3a kr ll krt cam follower cam follower with tap hole with cage assembly kru cam follower eccentric-shaft type with cage assembly eccentricity 0.25 to 1.0 mm krv cam follower full-complement needle roller type prelubricated with standard grease 3a krv ll cam follower sealed type krvt cam follower with tap hole krvu cam follower eccentric-shaft type eccentricity 0.25 to 1.0 mm krx cam follower special nukr cam follo
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ntn needle roller bearing handbook 3 bearing selection table 3.1 shows the types and characteristics of needle roller bearings needle roller bearings are available in a wide range of varying dimensions selecting a particular bearing requires a thorough knowledge of the structure and characteristics of different bearings and their correct applications no bearing no matter how well made will achieve its full potential if not carefully selected and correctly used when selecting bearings consider the following points 3 table 3.1 classifications and characteristics of bearings category needle needle separable adjustable roller and roller needle -clearance cage and cage roller needle assemblies assembly and cage roller bearing assembly bearing bearing drawn needle -cup roller needle bearing roller with bearing thrust ball bearing needle roller needle bearing roller with thrust bearing cylindrical with angular roller bearing contact ball bearing illustration series k k zw kmj pk kbk items rad
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ntn needle roller bearing handbook 5 3 examination of contraction ratio and clearance after mounting recommended fits of standard products are listed in catalogs the calculation method is also provided in detailed examination to be carried out 1 calculation of bearing contraction ratio if a drawn-cup bearing is used the contraction ratio is calculated as shown in the formula housing drawn-cup bearing 5 1 1 t2 s2 0.7 1.3t2 e2 dnom 2t e2 0.7s 2 1.3 e1 1 s2 1 outer ring contraction ratio dh housing single outside diameter mm dnom nominal diameter of fitting section mm de diameter of rolling contact surface of the outer ring mm e1 young s modulus of housing kgf/mm2 e2 young s modulus of outer ring 21 200 kgf/mm2 s dnom dh t de dnom 2 setting bore diameter after fitting the actual housing 1 press fitting of standard ring h housing bore diameter mm t roller diameter plate thickness mm d drawn-cup bearing single outside diameter mm li roller set bore diameter after press fitting mm
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ntn needle roller bearing handbook calculation/cam follower kr krv nukr outside diameter mm series kr16 krv16 kr19 krv19 kr22 krv22 kr26 krv26 kr30 krv30 kr32 krv32 kr35 krv35 nukr35 kr40 krv40 nukr40 kr47 krv47 nukr47 kr52 krv52 nukr52 kr62 krv62 nukr62 kr72 krv72 nukr72 kr80 krv80 nukr80 kr85 kr90 krv90 nukr90 nukr100 nukr120 nukr140 nukr150 nukr160 nukr170 nukr180 rated load cr 395 640 460 735 515 810 515 810 765 1 190 765 1 190 1 210 1 750 2 280 1 390 1 930 2 450 2 070 2 890 3 950 2 070 2 890 4 350 2 960 3 950 5 750 2 960 3 950 6 350 4 500 5 800 10 300 4 500 4 500 5 800 10 300 12 100 17 600 20 500 26 300 27 900 32 500 37 500 kgf cor track loading capacity kgf cylinder 350 415 525 620 785 835 spherical surface r stud strength static 140 450 1 070 1 920 1 920 2 850 2 850 pulsating 100 kgf alternating 40 outer ring strength kgf static 120 20 202 325 305 470 435 660 910 1 370 820 1 270 1 070 1 650 1 560 2 360 730 1 970 3 050 1 340 2 850 4 350 1 520 4 250 6 500 1 680 8 000 12 400 2 240
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ntn needle roller bearing handbook cam followers/roller followers with outer ring grooves cam followers with outer ring grooves above and various roller followers with outer ring grooves right bearings are provided with grooves on the outside diameter of the outer ring to match the shape of the mating material these bearings are used as guide rollers the groove shape can be processed as an r or v shape mounting instructions are identical to those of standard bearings features 1 the r-groove shape can be mirror-finished according to the requirements of the application generally turning followed by lapping 2 the basic design accommodates the cam follower standard 3 easy mounting 4 can also be used as an economical guide roller for direct drive machines applications ¡guide rollers for steel wires and steel pipes ¡leveling rollers ¡rope-gripping devices for winches of window-washing gondolas r-groove example applications of poly-lubricated bearings bearings for gripping gondola wire rope
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ntn needle roller bearing handbook structure and advantages of narrow bearings the outer ring has a thick design in order to provide greater rigidity as the outside surface of the outer ring is used directly as the raceway surface these bearings carry larger loads because double-row cylindrical rollers are used as the rolling elements the internal rubber seal and external steel seal plates of the sealed type form a labyrinth seal that provides a sufficient sealing effect the starting torque and grease prelubrication as well as the shape hardness roughness and rotational accuracy of the roller meet all the requirements of a backup roller application example backup roller a b c work roller d e middle roller f 9 plate with defective shape before shape correction plate with required shape after shape correction tension leveler 57
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ntn needle roller bearing handbook triple raceway bearings these needle roller bearings contribute to high-quality printing and easier maintenance features these needle roller bearings boast highaccuracy rotation and dimensions the adoption of the needle roller bearing design ensures a bearing section with a simple structure and compact design assembly and adjustment are simplified and stable longterm rotation is assured structure outer ring seal central ring inner ring needle roller and cage assembly staggered double-row arrangement needle roller and cage assembly 9 applications ¡offset sheet printing machine blanket cylinder with rubber trunk ¡maximum speed 15,000 sheets/hour 6-color machine 4-color machine 64
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ntn needle roller bearing handbook comparison of bearing series by manufacturer thrust roller bearings and thrust bearing rings ntn axk11 k811 k812 k893 k874 811 ina axk k811 k812 k893 k874 811 812 893 874 as gs ws axk gs zs axk ws zs k811 gs zs k811 ws zs zs tc torrington fnta nsk fnta fnth fnth az fntha fntha az iko ntb azk azk koyo tp,tpk thk nadella arz arz skf axk mc,gill thrust roller bearings and thrust bearing rings 812 893 mm 874 as11 gs ws axa21 axb21 ara821 arb821 zs ntc ctc ctca nwa nwb fta ftra ftrd f ftrd f as gs ws w ws cp cp,cpr cp,cpr pm pm pmh as gs ws nta nth ntha nta nth ntha tra trb trc trd tre bt twa twb twc twd tra trb trc trd tre trf tri,trj trid,trjd tw tw tw tw inch nwc nwd nwe nwf cws cgs 11 72
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memo 79
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