Four point contact ball bearing vs single row ball slewing bearing

How to choose four point contact ball bearings and single row rotary bearings  correctly may be a challenge for many people, especially when there are strict technical, reliability or economic requirements. In these cases, our company can use state-of-the-art analytical methods to provide advanced calculations and simulations to optimize and validate the best design to meet customer needs. Our company has a variety of customized bearings that meet design standards and different diameters to meet the needs of special applications. This paper briefly analyses four point contact ball bearings and single row rotary bearings as well as their characteristics. I hope this article will be helpful to you.

The main points are as follows：

◕ What is four point contact ball bearing

◕ What is single row ball slewing bearing

◕ Characteristics of Four Point Contact Ball Bearings and Single Rotary Ball Bearings

Explanation of four point contact ball bearing

Four point contact ball bearings are separated bearings, or a set of angular contact ball bearings which can withstand bidirectional axial loads. The inner raceway and the outer raceway are peach-shaped sections. When there is no load or pure radial load, the steel ball contacts with the steel ring at four points, which is also the origin of the name of the steel ball and the steel ring. Four point contact ball bearings are radial single row angular contact ball rotary bearings with raceways. They are designed to handle biaxial loads. These 4 point contact ball bearings require minimal space to withstand pure axial or combined loads. For heavy industry requirements, four-point contact spherical rings can be designed as large rotary bearings with bolt seat rings and internal or external integral transmission devices . The 4 point contact ball bearings can handle these three kinds of bearings at the same time, which makes it easy to simplify mechanical design. It combines radial, thrust and moment loads. The main materials of four-point contact ball bearings are 50Mn, 42CrMo and C45.

Definition of single row ball slewing bearing

Single row rotary ball bearings are four-point contact bearings with only one row of steel balls. They can withstand both axial load, radial load and tilting moment. A row of four-point contact ball slewing support consists of two seat rings. The seat rings are compact in structure and light in weight. Four points contact with the round raceway ball. There are three types of single row four-point contact ball rotary bearings: gearless bearings (toothless), external gear bearings (external teeth), and internal gear bearings (internal teeth). Single row slewing bearing is one of the most widely used basic types at home and abroad.

Characteristics of 4 Point Contact Ball Bearings and Single Rotary Ball Bearings

☞Characteristics of four-point contact ball bearings

❶ Four point contact ball bearings are separable structures, and single bearing can replace angular contact ball bearings with front or back combination.

❷ It can withstand radial load and biaxial load, and can limit the axial displacement in both directions, but it occupies less axial space than the current specifications of double row angular contact ball bearings.

❸ Compared with other ball bearings, 4 point contact ball bearings have smaller axial clearance and higher limit speed when the radial clearance is the same.

❹ The 4 point contact ball bearings are suitable for bearing pure axial load or combined axial and radial load. Because it is a double half inner ring (or outer ring), the number of balls loaded increases, and it has a larger carrying capacity.

❺ Under normal working conditions, when bearing bears axial load in any direction, it can form a contact angle. The steel ball contacts with the inner and outer raceways at one point, so as to avoid large sliding friction in the contact area. Therefore, bearings should not be subjected to radial forces and loads.

☞Advantages and disadvantages of single rotary ball bearings

Advantages

❶  Small friction resistance, flexible start-up and high efficiency;

❷  Strong bearing capacity per unit width;

❸ Greatly reducing the consumption of non-ferrous metals; easy to interchange, lubrication and maintenance.  

Disadvantages

❶ High contact stress, poor impact resistance, low life under high speed and heavy load, not suitable for high speed occasions with impact and instantaneous overload;

❷ Compared with double-row bearings and multi-row bearings, single row ball slewing bearing capacity is small, and it can not bear bidirectional axial load while bearing radial load; low vibration reduction capacity, noise in operation;

❸ Large radial outline size; small batch production of special rolling The cost of bearing is higher.

In summary, it is a brief introduction of 4 point contact ball bearings and single row rotary ball bearings. As they are increasingly used in engineering, how to select suitable bearings has become one of the most important issues. So please choose the right bearing according to your needs. Of course, if you have any questions about 4 point contact ball bearings and one row ball slewing bearings, please ask us in time, and we are glad to answer them for you.