3 Reasons-Why crossed roller bearing is the most suitable for robot arm?

The stretching and lateral movement of the robot arm all belong to linear motion. There are many kinds of mechanism to realize the reciprocating and linear motion of arm, such as piston oil (gas) cylinder, gear rack mechanism, screw nut mechanism and connecting rod mechanism. Because the piston oil (gas) cylinder is small in size and light in weight, it is widely used in the robot arm structure.

There are many kinds of mechanisms to realize the rotary motion of robot arm, such as vane rotary cylinder, gear drive mechanism, sprocket drive mechanism, piston cylinder and connecting rod mechanism. The most suitable bearing for robot arm is cross roller bearing. Why do you say that?



1. The inner and outer ring dimensions of the cross roller bearings are minimized, especially the ultra-thin structure is a small size close to the limit and highly rigid. Therefore, it is most suitable for joints or rotating parts of industrial robots.

2. Because the roller of cross roller bearing is arranged in cross arrangement, only one set of cross roller shaft rings can bear the load in all directions. Compared with the traditional model, the rigidity is increased 3-4 times. At the same time, because the inner ring or outer ring of the cross roller bearing is a two-section structure, the bearing clearance can be adjusted, even if preloaded, high precision rotary motion can be obtained.

3. Because the roller in the 90 ° V groove rolling surface by interval retainer is perpendicular arrangement, this design makes cross roller bearings can bear larger radial load, axial load and torque load, etc. All the direction of the load.

The arms of industrial robots generally have two to three degrees of freedom, that is, expansion, rotation or pitch. The total weight of the arm is large, and the force is generally complex. When moving, it directly bears the static and dynamic load of the wrist, hand and workpiece (or tool). Especially when moving at high speed, a large inertial force (or inertia moment) will be generated, causing impact and affecting the accuracy of positioning. It can be seen from the above points that cross roller bearing is the most suitable bearing for robot.