Cross Roller Bearing

SX Series Cross Roller Bearing

SX series (outer ring split, inner ring rotating type) is similar to the RB series. The outer ring is a two-segmented structure connected by three fixed rings, and the inner ring is designed as one piece. This type has a smaller cross-section than the RB series in the same journal case. Due to the ultra-thin design, there are no mounting holes for the outer and inner rings, and flanges and supports are required for installation. It is suitable for places that require high rotation accuracy of the inner ring.

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SX series (outer ring split, inner ring rotating type) is similar to the RB series. The outer ring is a two-segmented structure connected by three fixed rings, and the inner ring is designed as one piece. This type has a smaller cross-section than the RB series in the same journal case. Due to the ultra-thin design, there are no mounting holes for the outer and inner rings, and flanges and supports are required for installation. It is suitable for places that require high rotation accuracy of the inner ring.

Bearing Parameters

The parameter data of the SX series crossed roller bearings 

Type Main dimensions  basic load rating (axial) Basic load rating (radial) weight
Inner dia Outer dia Roller pitch width Greasing r Ca Coa Cr Cor Kg
circle dia. B B1  hole kN kN kN kN
d D Dpw S
SX011814 70 90 80 10 1.2 0.6 18 60 12 30 0.3
SX011818 90 115 102 13 1.2 1 26 96 17 47 0.4
SX011820 100 125 112 13 1.2 1 28 106 18 52 0.5
SX011824 120 150 135 16 1.5 1 41 153 26 75 0.8
SX011828 140 175 157 18 1.5 1.1 64 237 41 116 1.1
SX011832 160 200 180 20 1.5 1.1 69 272 44 133 1.7
SX011836 180 225 202 22 2 1.1 98 381 63 187 2.3
SX011840 200 250 225 24 2 1.5 106 425 68 208 3.1
SX011848 240 300 270 28 2 2 149 612 95 300 5.3
SX011860 300 380 340 38 2.5 2.1 245 1027 156 504 12
SX011868 340 420 380 38 2.5 2.1 265 1148 167 563 13.5
SX011880 400 500 450 46 2.5 2.5 385 1699 244 833 24
SX0118/500 500 620 560 56 2.5 3 560 2538 355 1244 44

SX Series Crossed Roller Bearing Features

1. Sustain radial, axial, and moment loads simultaneously.

2. High rotation accuracy is ensured by adjusting the bearing clearance to preload.

3. Stable rotation

Applications

SX 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.

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.