Cross Roller Bearing

CRB Series Crossed Roller Bearing

CRB series bearing belongs to high precision cross roller bearings. CRB crossed roller bearings’ outer ring is designed to be separable and fixed by a screw. Its cylindrical rollers are placed in a 90°V groove, with each roller arranged in a cross-shape with the adjacent one and separated by a space retainer.

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CRB Series Crossed Roller Bearing

CRB series bearing belongs to high precision cross roller bearings. CRB crossed roller bearings’ outer ring is designed to be separable and fixed by a screw. Its cylindrical rollers are placed in a 90°V groove, with each roller arranged in a cross-shape with the adjacent one and separated by a space retainer.

CRB Series Crossed Roller Bearing Features:

1. Sustain radial, axial, and moment loads

2. Make the best use of space

3. Stable Rotation and high rigidity & running accuracy supplied with average clearance, little clearance, or even under a pre-load.

CRB Series Crossed Roller Bearing Parameters:

Model No. Outer dimension (mm) Installation dimension (mm) Rated load (Kn) Weight
d D B/C Rmin da Da C C0 kg
CRB3010 30 55 10 0.3 34 44 5.29 6.35 0.12
CRB4010 40 65 10 0.3 44 54 5.98 8.04 0.15
CRB5013 50 80 13 0.6 55 71 14.2 18.4 0.29
CRB6013 60 90 13 0.6 64 81 15.4 21.5 0.33
CRB7013 70 100 13 0.6 75 91 17 25.5 0.38
CRB8016 80 120 16 0.6 86 107 24.3 37.5 0.74
CRB9016 90 130 16 1 98 118 25.9 42.1 0.81
CRB10020 100 150 20 1 108 134 39.4 61.1 1.45
CRB11020 110 160 20 1 118 144 41.2 66.7 1.56
CRB12025 120 180 25 1.5 132 164 59.9 95.4 2.62
CRB13025 130 190 25 1.5 140 172 61 99.8 2.82
CRB14025 140 200 25 1.5 151 183 64.4 108 2.96
CRB15025 150 210 25 1.5 160 192 65 113 3.16
CRB15030 150 230 30 1.5 166 202 85.9 144 5.3
CRB20025 200 260 25 2 208 239 75.3 148 4.0
CRB20030 200 280 30 2 218 262 133 234 6.7
CRB20035 200 295 35 2 221 274 168 282 9.58
CRB25025 250 310 25 2.5 259 290 83.9 183 4.97
CRB25030 250 330 30 2.5 265 310 146 283 8.1
CRB25040 250 355 40 2.5 271 330 215 382 14.8
CRB30025 300 360 25 2.5 310 341 91.9 217 5.88
CRB30035 300 395 35 2.5 318 372 205 408 13.4
CRB30040 300 405 40 2.5 321 381 235 451 17.2
CRB40035 400 480 35 2.5 414 457 165 400 14.5
CRB40040 400 510 40 2.5 423 483 270 590 23.5
CRB40070 400 580 70 2.5 430 532 576 1060 72.4
CRB50040 500 600 40 2.5 517 573 259 648 26.0
CRB50050 500 625 50 2.5 531 592 306 747 41.7
CRB50070 500 680 70 2.5 530 633 653 1330 86.1
CRB60040 600 700 40 3 621 676 287 774 30.6
CRB60070 600 780 70 3 630 734 700 1540 102
CRB600120 600 870 120 3 643 817 1490 2800 274
CRB70045 700 815 45 3 730 785 313 917 46.5
CRB70070 700 880 70 3 731 834 766 1810 115
CRB700150 700 1020 150 3 751 953 1980 3820 478
CRB80070 800 950 70 4 831 907 513 1440 109
CRB800100 800 1030 100 4 840 972 1140 2640 247

CRB Series Crossed Roller Bearing Applications:

CRB series cross roller bearings are especially suitable for limited space applications, while high rigidity and high rotation accuracy are required. Such as joints and swiveling units of industrial robots, machining center tables, rotary units of manipulators, precision rotary tables, medical equipment, measuring instruments, and IC manufacturing machines.

Crossed Roller Bearing Basics:

Cross roller slides and benches are linear bearings that use cylindrical rollers (as opposed to ball bearings) to carry loads. In these mechanisms, also known as cross roller bearings, the cylindrical rollers are sandwiched between two parallel guides, called bench and bed. Here, the rollers nest in the V-groove roller ground guide and cross at a 90° Angle (hence the term "cross").

Due to the large contact area of cross rollers, they deform smaller and stiffer than recirculating ball bearings, creating more precise and consistent motion. In addition, this consistent (non-slip) contact between the bracket and the base reduces wear.

The configuration of crossed roller bearings provides the designer with all the benefits of two rows of bearings, including stability, in a single row space since alternating rollers can support loads from all directions, including high rollover moments.

Selection of crossed roller bearing

Notes in use of crossed roller bearings:

The two-divided imner or outer ring fixed with special rivets or bolts and nuts inseparable. and should be diectly mounted into the bearing base for use. Meanwhile. if the spacer holder assembling sequenceis improper ,it will have a great impact on the rotation performance of the bearing.so,the bearing can not be disassembled freely.There is some deviation athe joint of inner or outer ring, before it is mounted into the bearing seat.the bolts to fix the imner or outer ring should be loosened to correct it with a plastic hammer. (the fixed rivets may be deformed with the bearing base deformation)Do not apply any extermal force onto the fixed rivets orbolts during the mounting or removal.

Please note the size tolerances of the mounting parts, and press securely the inner or outer ring with the flange from the side.

Lubrication for crossed roller bearing:

The crossed roller bearing has been filled with high quality 2# lithium grease, so it can be directly mounted for use. However. compared with common roller bearings it has a smaller intemal space. so the grease must be replenished periodically.

The grease should be replenished from the grease hole connected to the grease groove on the outer and inner rings. The grease replenishment interval is generally 6-12 months. The same grease must be replenished in all areas

Meantime, when the grease is filled fully,the initial rotation torque will be increased in a short ime due to the grease resistance;when the excess grease is spilled from the seal portions,it will soon be retumed to the normal torque value.