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RB Crossed Roller Bearings

RB Crossed Roller Bearings for precision inner ring rotation
RB Crossed Roller Bearings are the basic type of crossed cylindrical roller bearings. They are designed with a separable outer ring and an integrated inner ring, ideal for applications that require high rotation accuracy of the inner ring, such as indexing tables and rotary mechanisms. Compared with other types like thin section bearings or tapered roller bearings, RB bearings offer superior rigidity and precision in a compact size.
Total 95 Results
Part Number
size
Seal Type
Bore Dia
Outer Dia
Width
R(min)
Shoulder Height Ds(max)
Shoulder Height Dh(min)
Weight
RB6013
60 mm x 90 mm x 13 mm
Open
60 mm
90 mm
13 mm
0.6 mm
67 mm
82 mm
0.3 Kg
RB6013UU
60 mm x 90 mm x 13 mm
Double Seal
60 mm
90 mm
13 mm
0.6 mm
67 mm
82 mm
0.3 Kg
RB7013
70 mm x 100 mm x 13 mm
Open
70 mm
100 mm
13 mm
0.6 mm
77 mm
92 mm
0.35 Kg
RB7013UU
70 mm x 100 mm x 13 mm
Double Seal
70 mm
100 mm
13 mm
0.6 mm
77 mm
92 mm
0.35 Kg
RB8016
80 mm x 120 mm x 16 mm
Open
80 mm
120 mm
16 mm
0.6 mm
88 mm
110 mm
0.7 Kg
RB8016UU
80 mm x 120 mm x 16 mm
Double Seal
80 mm
120 mm
16 mm
0.6 mm
88 mm
110 mm
0.7 Kg
RB9016
90 mm x 130 mm x 16 mm
Open
90 mm
130 mm
16 mm
1 mm
98 mm
118 mm
0.75 Kg
RB9016UU
90 mm x 130 mm x 16 mm
Double Seal
90 mm
130 mm
16 mm
1 mm
98 mm
118 mm
0.75 Kg
RB10016
100 mm x 140 mm x 16 mm
Open
100 mm
140 mm
16 mm
1 mm
109 mm
129 mm
0.83 Kg
RB10016UU
100 mm x 140 mm x 16 mm
Double Seal
100 mm
140 mm
16 mm
1 mm
109 mm
129 mm
0.83 Kg
RB10020
100 mm x 150 mm x 20 mm
Open
100 mm
150 mm
20 mm
1 mm
113 mm
133 mm
1.45 Kg
RB10020UU
100 mm x 150 mm x 20 mm
Double Seal
100 mm
150 mm
20 mm
1 mm
113 mm
133 mm
1.45 Kg
RB11012
110 mm x 135 mm x 12 mm
Open
110 mm
135 mm
12 mm
0.6 mm
117 mm
128 mm
0.4 Kg
RB11012UU
110 mm x 135 mm x 12 mm
Double Seal
110 mm
135 mm
12 mm
0.6 mm
117 mm
128 mm
0.4 Kg
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A technical drawing of an RB crossed roller bearing, highlighting the one-piece inner ring and the two-piece separable outer ring.

Structural Benefits & Design Philosophy

The RB series is a fundamental type of crossed roller bearings. The design features a two-piece outer ring and a one-piece inner ring. This configuration is meticulously engineered for applications that primarily involve inner ring rotation while demanding high precision. The separable outer ring makes installation and assembly more manageable in certain setups, allowing for easier integration into complex machinery. This design also contributes to the bearing’s overall stability and rigidity, which is crucial for maintaining accuracy under varying load conditions.

Furthermore, the V-groove raceway and spacer system ensure the smooth and quiet operation of the bearing. The precisely machined components minimize friction and wear, extending the service life of the bearing even in high-load, high-speed applications. The crossed cylindrical roller bearings design significantly reduces the bearing’s cross-section, which is vital for applications with strict spatial constraints, without compromising on performance. This makes them a superior choice compared to traditional bearing arrangements that would require a larger footprint to achieve similar load capacities and rigidity.

Key Applications of RB Crossed Roller Bearings

Thanks to their unique structure and high performance characteristics, RB Crossed Roller Bearings are widely used in a variety of high precision bearings applications. One of their most prominent uses is in the rotary table bearings of machine tools. The ability to handle complex loads with exceptional accuracy makes them perfect for indexing tables, which require precise rotational positioning to achieve fine machining tolerances. The compact, high-rigidity design also makes them a popular choice for robot bearings, particularly in the rotating joints and end-effectors of robotic arms.

Beyond these specific examples, RB series bearings are also integral components in thin section bearings applications, precision measuring instruments, and medical devices. Their ability to deliver high rotational accuracy and stiffness in a small footprint is a significant advantage in these fields. By using a single bearing to replace a conventional arrangement of multiple bearings, they simplify machine design, reduce component count, and improve overall system performance. 

A schematic showing the placement of an RB crossed roller bearing within a machine tool rotary table.

Comparing RB with Other Crossed Roller Bearing Types

The RB Crossed Roller Bearing is a fundamental model. The key distinction lies in their ring structure. The RB series features a separable outer ring, which is ideal for inner ring rotation applications and easier assembly.

In contrast, the RU series has an integrated inner and outer ring, with mounting holes in both rings. This one-piece design provides extremely high rigidity and makes it a “mount-and-use” solution without needing extra fixing flanges, making it suitable for both inner and outer ring rotation.

Another notable comparison is with the RA Crossed Roller Bearings, which are an ultra-thin version of the RB type. While both have a separable outer ring and a one-piece inner ring, the RA series is designed to be as thin as possible to reduce weight, making it a perfect fit for aerospace bearings and robot joints where weight savings are critical. The RB type, while also compact, prioritizes a balance of rigidity and a slightly more robust design.

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FREQUENTLY ASKED QUESTIONS

What is the main difference between RB Crossed Roller Bearings and RE type?

The RB type has an integrated inner ring and split outer ring, suitable for inner ring rotation, while the RE type has an integrated outer ring and split inner ring, better for outer ring rotation.

Can RB Crossed Roller Bearings handle axial and radial loads simultaneously?

Yes. The crossed roller arrangement allows RB bearings to handle axial, radial, and moment loads at the same time.

What industries use RB Crossed Roller Bearings?

Industries include robotics, machine tools, medical equipment, and semiconductor manufacturing, where high precision and compact design are essential.

What is the significance of the separable outer ring in RB series bearings?

The separable outer ring of the RB Crossed Roller Bearings is a key design feature that offers practical benefits, particularly for applications where the inner ring rotates. This two-piece outer ring design simplifies the assembly process, allowing for easier mounting of the bearing onto the shaft or into the housing. This makes installation and maintenance more straightforward. The robust, one-piece inner ring ensures stable and accurate rotation, which is crucial for applications like the indexing tables of machine tools. This design balances ease of installation with the need for high-performance precision.
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