How to Select Bearings for Compact Robot Actuators

A robotic actuator combines a motor, transmission, bearing system and mechanical structure in a limited space. As actuator designs become smaller and more integrated, bearing selection becomes increasingly important.

Why Compact Actuators Need Careful Bearing Selection

A bearing that fits dimensionally may not necessarily be the best choice for the complete actuator.

Engineers should consider:

Load — Radial, axial and moment loads should be evaluated according to the actual structure.

Available Space — Compact actuators often have strict limits on bearing diameter and width.

Stiffness — The bearing arrangement can influence the rigidity and positioning behavior of the actuator.

Rotation Speed — Speed, lubrication and operating temperature should be considered together.

Accuracy and Service Life — Runout, dimensional accuracy, internal clearance or preload and expected operating conditions should be evaluated for the specific application.

Matching Bearing Types to Actuator Designs

Crossed roller bearings may be considered when rigidity and moment-load capability are important.

Crossed Roller Bearing Solutions

Four-point contact bearings can provide a compact solution for combined loading.

Four-Point Contact Bearing Solutions

Angular contact bearings can be considered when controlled axial load capacity and rotational performance are required.

When a Customized Bearing May Be Needed

When standard dimensions cannot satisfy the actuator structure, a customized bearing can be developed around the available space and operating conditions.

Beining Technology provides customized bearing solutions based on customer drawings and application requirements.

Customized Bearing Solutions

The best bearing is not simply the smallest bearing. It is the bearing that fits the complete mechanical system.

For a compact robot actuator, engineers can provide the drawing, load and speed requirements for evaluation.

Contact Beining Engineering Team

External Reference

Bearing rating life can be evaluated using established methods such as ISO 281.

ISO 281