Introduction of Bearings for Industrial Robots

Industrial robot bearing is one of the key components of industrial robot. There are two main types of bearings used in the manufacture of industrial robots, one is the constant section thin section bearing rings, the other is the thin-walled cross cylindrical roller bearing. In addition to the above two kinds of bearings, some other bearings can also be used manufacture industrial robots, such as harmonic reducer bearings, linear bearings, rod end joint bearings, etc.

 

No	Classification	Types	Application	Technical index
1	Constant section thin-walled bearing	Thin-walled four-point contact ball bearings,  Thin-walled angular contact ball bearings,  Thin-walled deep groove ball bearings	This kind of bearing is applied to the waist, elbow and wrist of an industrial robot.	The precision of this kind of bearing is P5 grade and the service life can reach more than 6000 hours.
2	Thin-walled cross cylindrical roller bearing	Multiple thin-walled cross cylindrical roller bearings	This kind of bearing is applied to the mechanical arm, shoulder and waist of an industrial robot.	The precision of this kind of bearing is P4 grade and the service life can reach more than 6000 hours.
3	RV reducer bearing	Multiple RV reducer bearings,  Components of cylindrical roller retainer	This kind of bearing is widely used in the field of industrial robot.	The precision of this bearing is P4 grade, the temperature rise is not more than 30℃, and the service life can reach more than 6000 hours.
4	Harmonic reducer bearing	Flexible bearings	This kind of bearing is used for joint parts of a robot with a small or medium torque.	The precision of this kind of bearing is P5 grade and the service life can reach more than 6000 hours.

 

 

Key Technologies of Industrial Robot Bearings

The development of modern industrial robots tends to be lightweight, and rod end bearings should be installed in a limited space, so bearings must also be lightweight. But at the same time, in order to ensure the performance of industrial robots, their industrial bearings must also have high performance. The following are the techniques required for the manufacture of bearings.

 

1. Dynamic quality and high precision detection of robot shaft bearing

 

2. Heat treatment process for micro deformation of thin section bearing rings loop

 

3. Precision grinding technology of spherical bearing ring based on grinding metamorphic layer control

 

4. Precise control technology of negative clearance of thin section bearings

 

5. Precise control technology of bulge of thin section angular contact ball bearing

 

6. Precision assembly technology of thin-walled bearing

 

7. Non contact measurement technology of thin section bearing rings

 

Unlike ordinary thin section bearings, the cross sections of the constant section thin section bearings are mostly square, and their dimensions are designed as fixed values. In the same series, the cross-sectional dimension of the bearing is constant, it does not increase with the increase of the inner diameter, so it is called the constant section thin-walled bearing. The constant section thin section bearing rings are mostly used in the waist, elbow, wrist and other parts of industrial robot with small cross-section size. In the case of the same inner diameter, the number of steel balls installed in the constant section thin-walled ball bearing is more than that in the standard rolling bearing, so the internal stress distribution of the bearing is improved, the elastic deformation at the contact between the steel ball and the channel is reduced, and the bearing capacity is improved.