Correct Selection of Precision Crossed Roller Bearings

Precision crossed roller bearings often appear in precision production equipment. For example, crossed roller bearings can be used

 in the joints and rotating parts of industrial robots and the rotary table of machining centers.

The selection of a suitable crossed roller bearing can ensure the stability of the equipment operation, so it is recommended to 

consider the following points when selecting the type:

1. Determine the rotation mode and rotation speed

Crossed roller bearings have different structural types according to their characteristics, so it is necessary to confirm whether the 

movement type of the mechanism is inner ring rotation or outer ring rotation, and the rotation speed parameters.

2. Confirm the installation method

Crossed roller bearings are generally mounted in two ways:

There are no installation holes in the inner and outer rings, and the installation and positioning are mainly carried out through the cooperation of the bearing seat and the compression flange, as well as the shaft and the inner diameter of the bearing. It is suitable for equipment with large installation space.

Both the inner and outer rings have installation holes. Its installation is relatively simple, and it is directly connected to the equipment through connecting bolts. It is suitable for equipment with compact structure and relatively small installation space.

3. Confirm the size range

Confirm the allowable size range of the mechanism and the required life cycle of the bearing, and select the appropriate bearing size specification according to the above two points.

4. Confirm the accuracy level required by the bearing

When selecting the accuracy, it is necessary to consider the rotation accuracy and dimensional tolerance of the inner and outer rings, and select the appropriate accuracy level according to the working conditions of the equipment.

5. Confirm rigidity

Confirm the rigidity required by the equipment to match the appropriate bearing clearance and rigidity of the mounting part.

6. Confirm the requirements for turning moment/overturning moment

The turning moment refers to the torque that the bearing bears when it rotates, and the overturning moment refers to the torque that the bearing can bear. Determining the requirements of the rotational torque can match the internal clearance of the bearing and the corresponding accuracy level. Determining the overturning moment that the bearing bears can clarify the structural type of the bearing.

7. Confirm the oiling and lubrication method:

The provided cross roller bearings have been filled with high-quality No. 2 lithium-based grease and can be used directly after arrival.

The recommended interval for relubrication is every 6-12 months. For high-frequency rotation occasions, it is more necessary to shorten the lubrication cycle.

In the ultra-thin bearing, since there is no oil groove, please be sure to set the corresponding oil groove at the matching part of the bearing, so as to replenish the lubricating grease in time.