Bearings for industrial robots, do you really know?

As one of the key accessories of industrial robots, industrial robot bearings are most suitable for joint parts or rotating parts of industrial robots, rotating table of mechanical processing center, rotating part of manipulator, precision rotating table, medical instruments, measuring instruments, IC manufacturing devices and so on(HONBbearing02).

1. Can withstand the axial, radial, overturning and other directions of the comprehensive load;

2. Thin-walled bearing;
3. High rotary positioning accuracy

• Industrial robot bearing classification

  It mainly includes two kinds of bearings for industrial robots, one is thin-wall bearings with equal section, and the other is cross roller bearings.In addition, there are harmonic reducer bearings, linear bearings, joint bearings, but the main or the same section of thin-wall bearings and cross roller bearings used more.

  Crossing Roller Bearing

  Cross roller bearings are cylindrical or tapered rollers arranged perpendicular to each other through isolation blocks on a 90 degree V-shaped groove rolling surface. Therefore, cross roller bearings can bear radial load, axial load and torque load and other multi-direction loads.The dimensions of the inner and outer rings are miniaturized, the extremely thin form is close to the limit of the small size, and has high rigidity, and the accuracy can reach P5, P4, P2.Therefore, it is suitable for joint and rotary parts of industrial robots, rotary tables of machining centers, precision rotary tables, medical machines, calculators, military, IC manufacturing devices and other equipment.

• Features of cross roller bearing:

  1. Excellent rotation accuracy

  The internal structure of the cross roller bearing adopts the rollers to be arranged vertically with each other at 90°. The interval retainer or isolation block is installed between the rollers, which can prevent the inclination of the rollers or the friction between the rollers, and effectively prevent the increase of rotating torque.In addition, the roller will not occur in one side contact phenomenon or lock phenomenon;At the same time, because the inner and outer ring is a segmented structure, the clearance can be adjusted, and even if prepressure is applied, high-precision rotation motion can be obtained.

   

  2. Simplify operation and installation

  The outer ring or inner ring, which is divided into two parts, is fixed together after loading the roller and the retainer, so the installation operation is very simple.

   

  3. Bear large axial and radial loads

  Because the rollers are arranged perpendicular to each other by spacer retainers on the 90° V-groove rolling surface, this design allows cross roller bearings to withstand large radial, axial, and torque loads in all directions.

   

  4. Greatly save installation space

  Cross roller bearing inner and outer ring size is minimal miniaturization, especially ultra-thin structure is close to the limit of small size, and high rigidity, so the most suitable for the joints of the industrial robot parts or rotating parts, machinery processing center of the rotary worktable, mechanical rotary department, precision rotary worktable, medical instruments, measuring instruments, such as IC manufacturing equipment widely used.

   

  • Harmonic reducer is a wave generator to generate controllable elastic deformation of the flexible wheel, the use of flexible bearing controllable elastic deformation to transfer motion and power, its characteristics are compact structure, high motion accuracy, high transmission ratio, used for small and medium torque of the robot joint.

  • The development of modern industrial robots tends to be lightweight. Bearing must be small in size and light in weight if it is to be installed in limited space.But at the same time, the robot has the performance of high load, high turning precision, high running stability, high positioning speed, high repeated positioning accuracy, long life and high reliability, which requires that the supporting robot bearing must have the performance of high bearing capacity, high precision, high stiffness, low friction torque, long life and high reliability.Lightweight and high performance are a contradiction.

• Industrial robot with thin wall bearing should not only ensure adequate bearing capacity, but also for accurate positioning, flexible operation, therefore, the bearing design analysis, the determination of main parameters, can’t rated dynamic load as the objective function, and to the rated dynamic load, stiffness and friction torque indicators such as the objective function for multi-objective optimization design, at the same time should be based on ring and frame deformation of thin-walled bearing finite element analysis method.