ntn bearing unit handbook contents 1 construction and features of ntn bearing units 2 2 unique features advantages of ntn bearing units 4 2.1 hard-to-loosen ball-point set screws 4 2.2 prevention of inner ring deformation and cracking due to over-tightening of set screws 5 2.3 protrusions on flinger to expel dust 6 2.4 oil inlet angle for larger alignment tolerances 7 2.5 self-aligning cover seal 8 2.6 stable breaking strength with standard bearing housing 9 2.7 tough light compact ductile series bearing units 10 2.8 high-reliability of steel series bearing units 12 2.9 reliable corrosion-resistant stainless steel bearing unit14 2.10 light corrosion and chemical-resistant bearing unit 16 2.11 deformation-resistant stretcher unit frames 19 2.12 reliable dust and water-proof triple-sealed bearing 22 2.13 bearing units for special applications 24 1 bearing unit for hearth rolls 24 2 water-cooled type bearing units 25 3 floating-side bearing unit for high-speed blowers 26 4 detachable bear
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features of ntn bearing units outline a 2.4 oil inlet angle for larger alignment tolerances self-alignment 1 the oil inlet of the uc type bearing is provided on the outer ring at an inclination of approx 10° thus the oil groove in the bearing housing can be located near the center of the bearing therefore the resultant tolerance for alignment is as large as 2° as shown in fig a in a case of narrower outer ring type 1° since the oil inlets of other manufacturers bearing units are oriented vertically the oil groove is inevitably located near the end face of the bearing housing as shown in fig b thus the distance between the fitting face of bearing and that of the bearing housing leads to the relationship a b a=ntn b=other manufacturers and the alignment tolerance of other manufacturers bearing units is smaller than that of ntn bearing units a b 10° fig a ntn fig b other manufacture as a result in a self-aligned state the overlap of fitting faces between bearing and bearing housings l
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a outline features of ntn bearing units stainless series bearing unit 2.9 reliable corrosion-resistant stainless steel bearing unit 1 the stainless series bearing unit is comprised of a stainless steel ball bearing and housing it features reliable corrosion resistance that is far superior to that of standard cast iron units 2 the stainless series bearing units contain authentic ntn solid grease which has specially heat-treated lubricating grease and ultra-high polymer polyethylene as a result these are virtually free from grease leakage and do not constitute a source of environmental contamination thus they are an optimal choice for food processing machines packing machines and textile machines that operate at normal temperatures 3 compared to conventional grease the grease in the stainless series bearing unit poses virtually no stirring resistance bearing rotation torque is lower than that of standard bearings approx 1/3 to 1/4 therefore the stainless series bearing units are an idea
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features of ntn bearing units outline a stretcher unit ® /m300 3 m300 type the vertical frames are more resistant to tilting since both the length a and the width b of the base plate are now greater than those of other manufacturers products a>a b>b two stiffener plates are welded to the inside of each right and left vertical frames to protect the vertical frame against possible deformation stiffener plates are welded to both sides of the upper frame to protect the upper frame against possible deformation ntn applicable to m313 through 318 stiffener plate a section a-a a baseplate b stiffener plate a applicable to m319 and 320 stiffener plate stiffener a plate a section a-a remarks lubricated or covered stretcher units are also available other manufacturers products a section a-a a a b 21
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a outline features of ntn bearing units 5 cantilever bearing units ˇpart number px0569 fig.2.14 ˇapplications used in locations where a both-end supporting arrangement is impossible and bearings must be replaced frequently due to severe operating conditions for example on the shaft of an orange washing brush ˇfeatures the bearing housing of this bearing unit has a groove to fit the bearing enabling easy replacement of bearings 34 14.3 uc205d1 12 0° 44 0.15 78 56 80 42 65 81.4 2-m12 p1.75dp.16 fig.2.14 28 25
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bearing unit part number bearing unit order codes b 3.2 bearing housing part number example designation 3.3 dust cover part number 1 cast iron cover p 2 05 d1 pp 2 05 cast iron housing fc200 steel plate housing spcc lubrication code bore dia no of applicable bearing dia series code of applicable bearing bearing housing type code example designation c-205 open cover cm-205 closed cover type c ck cm-204 218 c ck cm-305 328 note ck indicates the open cover for uk type bearings note no lubrication code is included in the part numbers of other manufacturers products since their products are lubricated as standard cover mounting bolt common to all cover types cover part number c ck cm204 211 211 218 305 309 310 322 324 328 m 6 15 m 8 20 m10 25 mounting bolt m 5 12 bearing housing type code jis standard products cast iron housing steel plate housing p f fl fc fs t c pp pf pfl bearing housing type code ntn series cast iron housing ip hp up fa hb fh l m pb fb fu flu pe fe stainless steel
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b bearing unit order codes bearing unit part number 6 dust cover seal cover seal part numbers type nitrile rubber seal silicone rubber seal fluoride rubber seal polyacrylic rubber seal type code nominal size cl cla clb clc metric size inch size cover seal part numbers are arranged as follows example type code cl cla nominal size 25 1 1/8 notes 1 use serial numbers to distinguish betweeen items with identical part numbers but different compositions 2 standard rubber material is nitrile rubber seals in other materials are available by special order 7 allen key wrench allen key wrench part numbers type code hrs nominal size mm size inch size allen key wrench part numbers are arranged as follows example type code hrs hrs hrs lblrc units mm nominal size 3 1/8 5-1 note use serial numbers to distinguish betweeen items with identical part numbers but different compositions table of allen key wrench sizes part no hrs2.5 hrs 32 hrs3 hrs 8 hrs4 hrs 32 hrs5 hrs 16 hrs6 hrs 4 hrs8 hrs 16 b 2.5 2.38
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bearing internal clearance handling of bearing units c 6 bearing fit to housing comparison spherical bore dia 180 mm max 180 mm min ntn j7 h7 asahi nachi h7 h7 fyh koyo j7 j7 nsk h7 h7 7 bearing internal clearance 1 radial internal clearance of ball bearing cylindrical bore nominal bearing bore dia d mm greater than smaller than min units m c2 max cn normal min max min c3 max min c4 max 10 18 24 30 40 50 65 80 100 120 18 24 30 40 50 65 80 100 120 140 0 0 1 1 1 1 1 1 2 2 9 10 11 11 11 15 15 18 20 23 3 5 5 6 6 8 10 12 15 18 18 20 20 20 23 28 30 36 41 48 11 13 13 15 18 23 25 30 36 41 25 28 28 33 36 43 51 58 66 81 18 20 23 28 30 38 46 53 60 71 33 36 41 46 51 60 71 84 97 114 notes 1 the clearances above are net clearances without considering elastic deformation due to measuring load 2 with tapered bore bearings internal clearances are each one level greater than those of cylindrical bore bearings 2 ball bearing types and radial internal clearance type standard type code d1 radial internal c
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c handling of bearing units installation of bearing housing 6 fit the cover that is fitted over the shaft into the spigot of the bearing housing in a manner similar to step 4 fig.8.15 fig.8.15 steel plate cover designed for easy installation and removal 1 ntn steel plate covered unit has a cover fitting groove as illustrated below fig.8.16 fit the cover in the cover fitting groove and tap it with a synthetic resin or wooden hammer from a 45° direction then the cover is securely fitted by reaction force fig.8.17 note that #204 is a press-fitted type 2 for easy removal of the cover a groove is cut on the outer side of the cover when removing the cover fit a flatblade screwdriver into this groove and then pry the cover to remove it other manufacturers bearing covers are all press-fitted making fitting and removal of covers difficult groove fig.8.16 from 45° direction tap around the circumference of the cover to apply a uniform impact on the cover fig.8.17 56
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compatibility table for part numbers of different manufacturers technical data d 9.2 stainless series bearing unit ntn f-ucpm204/lp03 f-ucpm205/lp03 f-ucpm206/lp03 f-ucpm207/lp03 f-ucpm208/lp03 f-ucpm209/lp03 f-ucpm210/lp03 fyh ucp204his6 ucp205his6 ucp206his6 ucp207his6 ucp208his6 ucp209his6 ucp210his6 asahi mucp204 mucp205 mucp206 mucp207 mucp208 mucp209 mucp210 f-ucfm204/lp03 f-ucfm205/lp03 f-ucfm206/lp03 f-ucfm207/lp03 f-ucfm208/lp03 f-ucfm209/lp03 f-ucfm210/lp03 ucfl204his6 ucfl205his6 ucfl206his6 ucfl207his6 ucfl208his6 ucfl209his6 ucfl210his6 mucfl204 mucfl205 mucfl206 mucfl207 mucfl208 mucfl209 mucfl210 notes 1 although ntn s stainless series bearing units are oilless type lubricated bearing units are also available 2 when considering use of food grade grease add l596 suffix instead of lp03 example f-ucpm204/l596 3 bearing units from fyh and asahi are lubricated as standard 9.3 plastic series bearing unit ntn f-ucpr204/lp03 f-ucpr205/lp03 f-ucpr206/lp03 f-ucpr207/lp03 f-ucp
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allowable speed technical data d example find the service life of grease for ucp205 when the radial load is 1 000 n and speed is 3 600 min-1 first find the n0 the basic dynamic rated load of ucp205 cr=14 000 n from fig.10.1 cr 14 000 14 pr 1 000 therefore n0 fl a0 =1.00 d 250 000 =10 000 25 fl 1.00 with ball bearing unit a0 250 000 n0 10 000 =2.78 n 3 600 on the chart in fig.10.2 join point a that corresponds to bore diameter d=25 and point b that corresponds to n0 n=2.78 with a straight line to find the intersection point c point c indicates a service life of 15 000 hours 11 allowable speed the allowable speed for running a ball bearing safely for long periods depends on the dimensions of the bearing the load exerted on the bearing and the peripheral speed of the seal contact fig.11.1 shows 7 000 the allowable speed reflecting these factors for higher speed applications it is recommended that bearing units with noncontact seals be used for further details consult ntn 6 000 allo
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