Advantages and disadvantages of four-point contact ball slewing rings

What is four-point contact ball slewing ring

The four-point contact ball slewing ring is composed of the inner ring, the outer ring, the steel ball and the retaining frame, the inner and outer rings are provided with arc-shaped raceways, and the steel ball and the raceway form a four-point contact slewing part, this unique structure makes it able to bear axial force, radial force and overturning moment at the same time, the contact stress is evenly distributed, the bearing capacity is high and the rigidity is good; When working, the steel ball is rolled in the raceway to achieve relative rotation of the inner and outer rings, which can ensure the smooth and accurate movement, and is widely used in cranes, excavators, wind turbines, automatic production line rotary workbenches and other equipment that needs to rotate and has requirements for bearing and accuracy.

Features of four-point contact ball slewing rings

High bearing capacity: The unique four-point contact structure makes the steel ball have four contact points with the inner and outer ring raceways, which can withstand axial force, radial force and overturning moment at the same time, and can adapt to complex stress conditions with high bearing capacity.

Good rotation accuracy: the steel ball rolls in the raceway, the movement is stable, and the uniformity of the four-point contact helps to ensure the accuracy of the rotary movement, which can meet the application scenarios with high requirements for rotary positioning accuracy.

Compact structure: Compared with some other types of slewing rings, under the same bearing capacity, the structure of four-point contact ball slewing rings is relatively compact, and the space occupied is small, which is conducive to the miniaturization design of equipment.

Easy installation: its structure is relatively simple, the installation process is relatively convenient, and there are usually mounting holes on the inner and outer rings, which are convenient for connection and fixation with other parts of the equipment, which can effectively improve the installation efficiency.

Low maintenance cost: rolling friction is adopted, the friction coefficient is small, the wear is relatively small, and it is generally equipped with a good sealing and lubrication system, which can effectively reduce the intrusion of external impurities and the wear of components, thereby reducing maintenance costs and prolonging service life.

Strong adaptability: According to different work requirements, by changing the material, surface treatment process and structural parameters, etc., to meet the needs of various harsh working environments and special working conditions, such as high temperature, low temperature, high humidity, corrosive environment, etc.

Advantages and disadvantages of four-point contact ball slewing rings

Four-point contact ball slewing rings are a common type of slewing ring, and here are its advantages and disadvantages:

merit

High bearing capacity: the four-point contact ball slewing ring can bear the axial force, radial force and overturning moment at the same time, through the reasonable design of the raceway and ball size, can meet different bearing requirements, often used in large machinery and equipment, such as cranes, excavators, wind turbines, etc., can stabilize the slewing parts of the support equipment, to ensure the normal operation of the equipment.

High rotation accuracy: its structural design can ensure good contact between the ball and the raceway during the rotation process, and the perpendicularity and parallelism of the rotary axis and the installation surface are high, which can make the rotation movement of the equipment more stable and accurate, and is suitable for occasions with high requirements for rotation accuracy, such as precision machine tools, radar antennas, etc.

Small coefficient of friction: rolling friction replaces sliding friction, and the coefficient of friction is usually between 0.002 - 0.005, which is much smaller than that of sliding bearing, which can effectively reduce energy loss, improve equipment transmission efficiency, reduce power consumption and save operating costs.

Easy installation: the overall structure is compact, the installation size is relatively small, the weight is light, the installation process is simple, and it can be fixed on the installation surface of the equipment by bolts, which can shorten the installation and commissioning cycle of the equipment and improve the work efficiency.

shortcoming

The impact resistance is relatively weak: although it can withstand a certain impact load, compared with the roller bearing, the contact area between the ball and the raceway is small, and when bearing a large impact, the ball and the raceway are prone to plastic deformation, wear and even cracking, which is not suitable for working conditions with large impact load, such as crusher, vibrating screen and other equipment.

High requirements for the working environment: In order to ensure normal operation and service life, there are certain requirements for the cleanliness, temperature and humidity of the working environment. Dust and impurities are easy to enter the raceway, aggravate wear and reduce the rotation accuracy; High temperature will reduce the performance of the grease and accelerate the aging of the seal; High humidity environments can cause corrosion of components and are usually suitable for clean environments with temperatures between -20°C and 80°C and relative humidity not exceeding 80%.

High manufacturing cost: Due to the strict requirements for machining accuracy and assembly process, it is necessary to use high-precision processing equipment and advanced detection methods to ensure the dimensional accuracy, shape accuracy and surface quality of raceways and balls, resulting in higher manufacturing costs, more expensive product prices, and increased equipment procurement costs.

Four-point contact ball slewing ring supplier

As a well-known supplier of slewing bearings with 30 years’ experience, LTZC bearings is committed to providing slewing bearings with high quality and low price. The specific price needs to be comprehensively evaluated according to the size, load, material and accuracy requirements of the bearings. Please contact us if necessary.