Cross Roller Bearing

RA Series Cross Roller Bearing

RA series crossed roller bearing has high rigidity, loading capacity, and rotation accuracy. It has an integrated inner and separable outer ring, sharing the same structure with RB crossed roller bearing, except it’s ultra-thin. It is suited for where lightweight, compact designs are required, such as the swiveling units of industrial robots or manipulators.

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RA series crossed roller bearing has high rigidity, loading capacity, and rotation accuracy. It has an integrated inner and separable outer ring, sharing the same structure with RB crossed roller bearing, except it’s ultra-thin. It is suited for where lightweight, compact designs are required, such as the swiveling units of industrial robots or manipulators.

Bearing Parameters

Bearing No. Main dimensions Roller pitch circle diameter Chamfer Shoulder height Basic load rating (radial) Mass Equivalent Model
inner ring outer ring width B /B1
d(mm) D(mm) (mm) DP (mm) r(min) ds Dh C(kN) C0(kN) kg EPT
RA5008 50 66 8 57 0.5 53.5 60.5 5.1 7.19 0.08 CRBS508
RA6008 60 76 8 67 0.5 63.5 70.5 5.68 8.68 0.09 CRBS608
RA7008 70 86 8 77 0.5 73.5 80.5 5.98 9.8 0.1 CRBS708
RA8008 80 96 8 87 0.5 83.5 90.5 6.37 11.3 0.11 CRBS808
RA9008 90 106 8 97 0.5 93.5 100.5 6.76 12.4 0.12 CRBS908
RA10008 100 116 8 107 0.5 103.5 110.5 7.15 13.9 0.14 CRBS1008
RA11008 110 126 8 117 0.5 113.5 120.5 7.45 15 0.15 CRBS1108
RA12008 120 136 8 127 0.5 123.5 130.5 7.84 16.5 0.17 CRBS1208
RA13008 130 146 8 137 0.5 133.5 140.5 7.94 17.6 0.18 CRBS1308
RA14008 140 156 8 147 0.5 143.5 150.5 8.33 19.1 0.19 CRBS1408
RA15008 150 166 8 157 0.5 153.5 160.5 8.82 20.6 0.2 CRBS1508
RA16013 160 186 13 172 0.5 165 179 23.3 44.9 0.59 CRBS16013
RA17013 170 196 13 182 0.8 175 189 23.5 46.5 0.64 CRBS17013
RA18013 180 206 13 192 0.8 185 199 24.5 49.8 0.68 CRBS18013
RA19013 190 216 13 202 0.8 195 209 24.9 51.5 0.69 CRBS19013
RA20013 200 226 13 212 0.8 205 219 25.8 54.7 0.71 CRBS20013

RA Series Crossed Roller Bearing Features

1. Sustain radial, axial, and moment loads at the same time

2. High rigidity & running accuracy

3. Ultra-thin type, lightweight

The Application of RA Series Crossed Roller Bearing

RA series crossed roller bearings are widely used in industrial robots, CNC machine tools, reducers, printing machinery, medical equipment, accuracy measurement and control equipment, communication radar antennas, optical equipment, etc.

Installation instructions for cross roller bearing

The cross roller bearing should be mounted with the following steps:

1. Inspection before mounting the parts:

Wash and clean the bearing base or other mounting parts to remove the dirt and confirm that the burr on the parts has been removed.

2. Mount the bearing into the bearing base or onto the shaft. Because the thin-walled bearing may be mounted tilt, it should be leveled and mounted by beating it evenly with a plastic hammer in the circumferential direction until it is fully contacted with the contact surface can be confirmed with the sound.

3. Side pressing flange mounting

(1) Place the side pressing flange in place, and shake it back and forth several times in the circumferential direction to adjust the positions of the mounting bolts.

(2) Mount the pressing bolts. Tighten the bolts manually and ensure no deviation from the bolt holes.

(3) The pressing bolts can be tightened progressively and diagonally in 3~4 stages. Slightly rotate the integrated inner or outer ring to correct the two divided parts.

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 significant 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 set rivets may be deformed with the bearing base deformation)Do not apply extermal force onto the set 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 two # lithium grease so it can be directly mounted for use. However, compared with standard roller bearings, it has a smaller internal 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 quickly due to the grease resistance; when the excess grease is spilled from the seal portions, it will soon be returned to the standard torque value.