In recent years, with the development of manufacturing technology level, the demand for various types of robots of modern manufacturing technology is increasing. Such as large-scale construction machinery, automobiles, home appliances and other automated production lines, as well as deep-sea manned submersibles, humanoid bionic robots, and painting, arc welding, spot welding, assembly, and handling industrial robots that enhance the country's high-tech strategic position. The key supporting special bearings for the robot have an important impact on key performance indicators such as the robot's smooth operation, repeat positioning accuracy, motion accuracy and work reliability.

At present, there are many types of bearings for industrial robots, such as thin-walled deep groove ball bearings, thin-walled angular contact ball bearings, thin-walled four-point contact ball bearings and thin-walled crossed roller bearings. Thin-walled four-point contact ball bearings and crossed-walled roller bearings have the characteristics of strong combined load bearing capacity, high precision, small frictional moment, light weight, and stable operation, so they are mostly used in the waist, elbow, and wrist of industrial robots. Department and other parts.

Structural form of thin-walled four-point contact ball bearings

Thin-walled four-point contact ball bearings for industrial robots usually have a structure with or without a seal ring. It is mainly composed of inner ring, outer ring, cage, steel ball or non-contact sealing ring. The inner and outer rings are integral structures, the steel balls are in four-point contact with the grooves of the inner and outer rings, and the cage is a crown-shaped plug-in structure. Suitable for installation on joints such as wrists and elbows of industrial robots.

Features of thin-wall sealed four-point contact ball bearings

1. The ratio of the outer diameter to the inner diameter is small, the diameter of the rolling elements is small, and the number is large. Compared with the standard bearing with the same inner diameter, its weight is about 5% of the standard bearing, and the cross-sectional area is about 20% of the standard bearing.

2. Fixed section bearings: Thin-walled four-point contact ball bearing series, the cross-sectional size of the bearings is the same, and does not change with the change of the inner and outer diameters.

3. It can bear radial load, bidirectional thrust load and overturning moment, which is equivalent to two sets of angular contact ball bearings installed back to back, but its width is only equivalent to the width of a set of angular contact ball bearings.

Most of the supporting bearings for domestic industrial robots rely on imports. Although a few manufacturers such as Luoyang Hongyuan Bearing Technology Co., Ltd. can produce supporting bearings for industrial robots, they have small batches, few varieties and specifications, low degree of generalization of parts, long supply cycle, high cost, and unstable quality. Seriously restricted the normal development of the domestic industrial robot industry. In order to promote the improvement of domestic industrial robot special bearing design and processing technology.