RU178 crossed roller bearing detail specifications:

RU178 bearing rotation accuracy:

RU178 cross roller bearing features:

1. Integrated inner ring and outer ring, provide high stiffness
2. Sustain radial, axial and moment loads at the same time
3. High rigidity & rotation accuracy, compact structure reduce the influence by installation
4. Miniaturization. Inner ring and outer ring with mounting holes, so it can be easily mounted to a device with bolts without need for housing and fixing plate, so surrounding parts of the bearing can be made compact, which contributes to miniaturization and weight saving of devices.

Check more RU series crossed roller bearings.

FAQ

1. What’s the difference between clearance CC0 or C0?
RU178 bearing CC0 radial clearance is -0.01~0mm, while C0 radial clearance is 0~0.05mm. Generally speaking, when high accuracy(runout) and high stiffness is required, negative clearance CC0 is suggested. When the temperature difference between inner and outer ring is large, or a lower friction torque is required, C0 clearance is more appropriate.

2. What is the hardness of RU178 bearings?
The hardness of standard type RU178 bearing is HRC 58~63.

3. How to lubricate RU178 cross roller rings?
Unless otherwise stated, all BRS made RU series crossed roller bearings are filled with proper amount of complex lithium grease before delivery. So users can directly put bearings into application after receiving goods. Then after 1~6 months operation, bearings should be added with proper grease based on working conditions.

RU178 crossed roller bearing installation instructions

RU178 Bearing Mounting Holes

Shoulder height

ds: 161mm

Dh: 195mm

PCD1 : 139mm

PCD2: 217mm

Inner ring mounting hole 12-φ9 drilled through, φ14 counter bore depth 8.6

Outer ring mounting hole 12-φ9 drilled through, φ14 counter bore depth 8.6

Cautions: For crossed roller bearings with split outer ring, when the rigidity of the mounting parts is not sufficient, stress concentration will occur at the contact area between the rollers and raceways, and the bearing performance will be deteriorated significantly.

Therefore, it is necessary to carefully examine the rigidity of housing and the strength of fixing bolts when a large moment will be applied.

1.Before installation, please clean bearing bracket, shaft, or other components, make sure there is no burrs or rough edge.
2.Fix the inner and outer rings in the axial direction directly to the mounting surface by fixing bolts
3. If large number of radial load and/or moment is applied, it is recommended to prepare flange part as Fig.4.