Cross Roller Bearing
RU Series Cross Roller Bearing
RU series crossed roller bearing integrated inner/outer ring type since the mounting holes are provided, the model does not require a presser flange or housing. In addition, because it has an integrated inner/outer ring structure and is equipped with washers, its performance is minimally affected by the mounting procedure, ensuring stable rotation accuracy and torque. This model can be used for both inner-ring rotation and outer-ring rotation.
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RU series crossed roller bearing integrated inner/outer ring type since the mounting holes are provided, the model does not require a presser flange or housing. In addition, because it has an integrated inner/outer ring structure and is equipped with washers, its performance is minimally affected by the mounting procedure, ensuring stable rotation accuracy and torque. This model can be used for both inner-ring rotation and outer-ring rotation.
Bearing Parameters
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| Part NO. | Dimension(mm) | Mounting(mm) | Base Load Ratings(kN) | Mass (kg) | |||||
| Open Type | Sealed Type | d | D | B | PCD1 | PCD2 | Cr | Cor | |
| RU28 | RU28UU | 10 | 52 | 8 | 16 | 42 | 2.9 | 2.4 | 0.12 |
| RU42 | RU42UU | 20 | 70 | 12 | 28 | 57 | 7.35 | 8.35 | 0.29 |
| RU66 | RU66UU | 35 | 95 | 15 | 45 | 83 | 17.5 | 22.3 | 0.62 |
| RU85 | RU85UU | 55 | 120 | 15 | 65 | 105 | 20.3 | 29.5 | 1 |
| RU124 | RU124UU | 80 | 165 | 22 | 97 | 148 | 33.1 | 50.9 | 2.6 |
| RU124(G) | RU124(G)UU | 80 | 165 | 22 | 97 | 148 | 33.1 | 50.9 | 2.6 |
| RU124X | RU124XUU | 80 | 165 | 22 | 97 | 148 | 33.1 | 50.9 | 2.6 |
| RU148 | RU148UU | 90 | 210 | 25 | 112 | 187 | 49.1 | 76.8 | 4.9 |
| RU148(G) | RU148(G)UU | 90 | 210 | 25 | 112 | 187 | 49.1 | 76.8 | 4.9 |
| RU148X | RU148XUU | 90 | 210 | 25 | 112 | 187 | 49.1 | 76.8 | 4.9 |
| RU178 | RU178UU | 115 | 240 | 28 | 139 | 217 | 80.3 | 135 | 6.8 |
| RU178(G) | RU178(G)UU | 115 | 240 | 28 | 139 | 217 | 80.3 | 135 | 6.8 |
| RU178X | RU178XUU | 115 | 240 | 28 | 139 | 217 | 80.3 | 135 | 6.8 |
| RU228(G) | RU228(G)UU | 160 | 295 | 35 | 184 | 270 | 104 | 173 | 11.4 |
| RU228X | RU228XUU | 160 | 295 | 35 | 184 | 270 | 104 | 173 | 11.4 |
| RU297X | RU297XUU | 210 | 380 | 40 | 240 | 350 | 156 | 281 | 21.3 |
| RU297(G) | RU297(G)UU | 210 | 380 | 40 | 240 | 350 | 156 | 281 | 21.3 |
| RU445(G) | RU445(G)UU | 350 | 540 | 45 | 385 | 505 | 222 | 473 | 35.4 |
| RU445X | RU445XUU | 350 | 540 | 45 | 385 | 505 | 222 | 473 | 35.4 |
Application:
Machine tool spindle, industrial robot, medical equipment, precision rotary table, etc.
 Grease consumption of RU series crossed roller bearing:
 Grease consumption of RU series crossed roller bearing:Generally, the amount of grease for cross-roller bearings should not be too small or too little. Too much will cause problems such as increased energy consumption, temperature rise, and affect sealing, but too little will not achieve the purpose of lubrication, so it is reasonable. The grease filling amount should refer to the following points:
1. The inner cavity of the bearing should not be full filled with grease, but only half to three-quarters of the total space of the internal cavity of the bearing;
2. For bearings that are used horizontally, the amount of grease added should account for about two-thirds to three-quarters of the inner cavity space;
3. The vertically installed cross roller bearings are filled with grease, and the filling amount should occupy one-half (upper side) and three-quarters (lower side) of the inner cavity space;
4. In an environment that is prone to pollution, the bearings running at low or medium speed should fill all the space in the bearing box;
5. Before filling the high-speed bearing with grease, the bearing should be immersed in high-quality lubricating oil to avoid bearing burns due to insufficient lubricating grease on the friction surface during startup.
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.
