Roller Bearings
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Cylindrical roller bearings belong to the separate type bearings,whose  roller and raceway is linear contact and whose  radial load  capacity is greater applying to heavy load and shock load and high speed conditions.the mounting and dismounting of such bearings is more convenient,when the requirements of inner and outer ring interference fit ,its advantages are demonstrated .this bearing can be classified  into single-row ,double-row ,four-row cylindrical roller bearings according to the rows of rollers. In addition ,there are Cylindrical roller bearings with a full complement of  rollers and other arrangements,one of which is the most widely used --single row cylindrical roller bearing with cage.

The two arrangement of double-row cylindrical roller bearing are cylindrical bore and tapered bore.The advantages of such bearing are compact in structure,high rigidity,high carrying capacity and less defomation under loads  and so on. the characteristics are suitable for supporting  spindles of  machine tools. It is classified into NN and NNU type. NN type have two ribs on the  inner ring and the outer ring withour ribs,NNU type have two ribs on outer ring and the inner ring without ribs ,this two types bearings permit  the axial displacement of shaft relative to the housing  and are used  as  non-loacting bearing.

cylindrical roller bearings with  Full complement of rollers have two types: single-row (NCF) and double-row (NNCF) full complement of roller cylindrical roller bearings because such bearings have no cage and have larger number of rollers, their carrying capacity is large,but the high speed performance is poor,generally used in low speed and heavy load application.

The cage of cylindrical roller bearings ,when its outer diameter D?Q400mm,generally use pressed

steel plate (or belt) cage,when D??400mm ,use steel or brass machined solid cage;four-row cylindrical roller bearings use brass cage or pin column cage.

DOUBLE ROW CYLINDRICAL ROLLER BEARINGS  d150-190mm

Dimensions Basic load ratings

Dyc     stc

Cr      Cor Old Model New Model Weight

d D B / H

mm mm mm KN  kg

150 210 60 300     590 4482930 NNU4930. 6.3

150 210 60 300     590 4382930 NNU4930K 6.2

150 225 56 330     570 3282130 NN3030 7.8

150 225 56 330     570 3182130 NN3030K 7.7

150 250 100 680     1170 - NNU4130 18

150 250 100 680     1170 - NNU4130K 17.5

160 220 60 315     620 4482932 NNU4932 6.6

160 220 60 315     620 4382932 NNU4932K 6.5

160 240 60 345     620 3282132 NN3032 8.4

160 240 60 345     620 3182132 NN3032K 813

160 270 109 850     1380 - NNU4132 25

160 270 109 850     1380 - NNU4132K 24.5

170 230 30 330     680 4482934 NNU4934 7

170 230 60 330     680 4382934 NNU4934K 69

170 260 67 435     810 3282134 NN3034 13.3

170 260 67 435     810 3182134 N3034K 12.9

170 280 109 880     1500 - NU4134 26

170 280 109 880     1500 - NU4134K 25.5

180 250 69 400     770 4482936 NU4936 11

180 250 69 400     770 4382936 NU4936K 10.5

180 280 74 550     1000 3282136 NN3036 17

180 280 74 550     1000 3182136 NN3036K 16.5

180 300 118 980     1650 - NNU4136 33

180 300 118 980     1650 - NNU4136K 32.5

190 260 69 400     800 4482938 NNU4938 11.5

190 260 69 400     800 4382938 NNU4938K 11

190 290 75 560     1000 3282138 NN3038 18