Home » The relationship between the characteristics of four-point angular contact ball bearings and thin-walled ring bearings

The relationship between the characteristics of four-point angular contact ball bearings and thin-walled ring bearings

by Andrew Jonathan

What is a four point angular contact ball bearing

When the bearing bears radial load and axial load at the same time, the connection line between the force point of contact between the rolling element (steel ball) and the outer ring and the force point of contact between the rolling element (steel ball) and the inner ring, and the bearing The radial vertical line is at a certain angle, and this type of bearing is called an angular contact ball bearing.

Bearings that can withstand radial loads and axial loads in one direction are called single-row radial angular contact ball bearings (the rolling elements are steel balls). This kind of bearing rolling element (steel ball) has only two stress points up and down.

Four-point angular contact ball bearings can bear radial load and bidirectional axial load. When the bearing bears axial load in different directions, the force points acting on the rolling elements are also different. That is to say, when bearing an axial load in one direction, there are upper and lower stress points, and when bearing an axial load in another direction, there are two stress points that are different from the previous two stress points.

When the force on the same rolling element is different, there are different points of force. In layman’s terms, these force points add up to four, so they are called four-point angular contact ball bearings.

Features of four-point contact ball bearings

This kind of bearing is a separable structure, which can bear radial load and bidirectional axial load, and can limit the axial displacement in two directions, but it occupies less axial space than the current double row angular contact ball bearing. A single bearing can replace angular contact ball bearings with front or rear combination. Because it is a double half inner ring (or outer ring), the number of balls is increased, and it has a larger bearing capacity.

Four-point contact ball bearings are suitable for bearing pure axial load or combined axial and radial loads dominated by axial loads. Compared with other ball bearings, this kind of bearing has smaller axial clearance and higher limit speed when the radial clearance is the same. Under normal working conditions, when this type of bearing bears an axial load in any direction, it can form a contact angle, and the steel ball contacts the inner and outer raceways at one point to avoid large sliding friction in the contact area. Therefore, the bearing should not bear mainly radial force and load.

What are the characteristics of four point contact ball bearings?

In recent years, with the continuous development of advanced manufacturing industry and the improvement of automated production lines for large-scale construction machinery and automobiles, the demand for various types of robots in the high-end manufacturing industry has increased. The supporting bearing of the rotating part of the robot has a significant impact on the smooth operation of the robot, the repeatability of positioning and the reliability of the work.

At present, there are many types of bearings used in 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. Among them, thin-walled four-point contact ball bearings and walled crossed roller bearings have the characteristics of strong combined load bearing capacity, high precision, low friction torque, light weight and stable operation, so they are mostly used in the waist, elbow and wrist of industrial robots. Department and other parts.

Four point contact ball bearing features:

(1) It can meet the needs of users for lightweight bearings. The ratio between the outer diameter and the inner diameter is small, the rolling element diameter is small, and the number is large. Compared with the standard bearing of 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 bearing: thin-walled four-point contact ball bearing series, the bearing cross-sectional size is the same, and does not change with the change of inner and outer diameters.

(3) It can withstand 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 one set of angular contact ball bearings.

(4) The steel wire threaded sleeve has the characteristics of wear resistance, high temperature resistance and corrosion resistance, which will not rust the mating base and increase the bearing capacity and fatigue strength of the threaded connection.

(5) Thin-walled four-point contact ball bearings can improve the internal fit and meet the desired running performance requirements. Bearings with preload are used for high stiffness applications and bearings with radial clearance are used for low friction torque applications. In addition, standard crossed roller bearings typically have no protection against corrosion and custom seals for extreme environments, special application greases and high temperature capability

Thin-walled ring bearings can achieve multiple functions according to different designs

Thin-walled ring bearings are highly accurate, very quiet and have a high load-carrying capacity. These ball bearings are available in three designs and are extremely small and mostly square in cross-section. In these series, the cross section remains the same even for larger shaft diameters and bearing bores. These bearings are therefore called constant cross-section (CS). It is this characteristic that distinguishes thin-walled ring bearings in the standard ISO series from conventional bearings.

Therefore, it is possible to choose a larger cross section and use a bearing with a higher load capacity without having to change the shaft diameter. Thin-walled ring bearings can be designed to be extremely light and require very little space.

The relationship between thin-walled ring bearings and deep groove ball bearings, four-point contact bearings, and angular contact ball bearings

Thin-walled ring bearings can be deep groove ball bearings (C), four-point contact bearings (X), and angular contact ball bearings (E). All of the above designs are available in different series. The series depends on the size of the cross section. The ball matches the series.

Deep groove ball bearings can support bidirectional axial loads and radial loads.

Four-point contact bearings can support axial loads in both directions as well as radial loads; therefore they operate in the same way as double row angular contact ball bearings.

Angular contact ball bearings can match the optimum number of balls and have a contact angle of 30°. They support higher radial loads than deep groove ball bearings or four-point contact bearings, and can support axial loads originating from the same direction. For special requirements, angular contact ball bearings are also available as matching bearings. Therefore, the rigidity and load-carrying capacity of these combinations are much higher than single-bearing products.

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