Double-row Ball Slewing bearings VS Four-point Contact Slewing bearings
Double-row ball slewing bearings and four-point contact slewing bearings are two commonly used support structures in the mechanical field. The following are their differences and connections.
What is Double-row Ball Slewing bearing?
The double-row ball slewing bearing is a type of slewing bearing, mainly composed of components such as an inner ring, an outer ring, two rows of steel balls, and spacers. Its unique structure features two rows of steel balls. Compared with single-row ball slewing bearings, this design greatly improves the load-bearing capacity, enabling it to withstand large axial forces, radial forces, and overturning moments simultaneously. It is widely used in various large-scale mechanical equipment, such as port cranes, large excavators, wind power generation equipment, etc. It can ensure the smooth and flexible rotation of key components of the equipment, and is a crucial mechanical component for ensuring the normal operation and efficient operation of these devices. It plays an important role in enhancing the performance and reliability of the equipment.
What is Four-point Contact Slewing bearing?
The four-point contact slewing bearing is a mechanical component composed of an inner ring, an outer ring, rolling elements, etc. The rolling elements have four-point contact with the raceways of the inner and outer rings, and can withstand axial forces, radial forces, and overturning moments simultaneously. It has the characteristics of a compact structure, high rotation accuracy, and large load-bearing capacity, and is widely used in fields such as construction machinery, wind power, and robotics. It can achieve the smooth slewing motion of components and is an essential key component in many large-scale mechanical devices.
Differences of Double-row Ball Slewing bearings and Four-point Contact Slewing bearings
– Structural Features: The double-row ball slewing bearing has three rows of balls. The upper and lower rows are load-bearing balls, and the middle row is spacer balls, which are separated by a cage. The structure is compact and has good rigidity. The four-point contact slewing bearing consists of two raceways, with arc-shaped raceways. The balls have four-point contact with the raceways and can withstand axial forces, radial forces, and overturning moments simultaneously. The structure is relatively simple.
– Load-bearing Capacity: The double-row ball slewing bearing has a large number of evenly distributed balls, which can withstand large axial forces, radial forces, and overturning moments, and is suitable for large-scale mechanical equipment. The balls of the four-point contact slewing bearing have four-point contact with the raceways, and its load-bearing capacity is relatively small, making it suitable for small and medium-sized mechanical equipment.
– Rotational Flexibility: The double-row ball slewing bearing has a large number of balls, resulting in high rolling friction resistance and relatively poor rotational flexibility. The four-point contact slewing bearing has fewer contact points between the balls and the raceways, low rolling friction resistance, and good rotational flexibility.
– Installation Method: The double-row ball slewing bearing is usually fixed to the equipment by bolt connection or welding, and requires high installation accuracy. The installation methods of the four-point contact slewing bearing are more flexible, and can be bolt connection, pin connection, or interference fit. The installation accuracy requirements are relatively low.
– Application Scenarios: The double-row ball slewing bearing is often used in large construction machinery such as large cranes, port machinery, and excavators, as well as in large equipment such as wind turbines and Ferris wheels. The four-point contact slewing bearing is often used in small and medium-sized construction machinery such as small and medium-sized cranes, forklifts, and aerial work platforms, as well as in fields such as industrial robots and automated production lines.
Connections of Double-row Ball Slewing bearings and Four-point Contact Slewing bearings
– Functional Role: Both double-row ball slewing bearings and four-point contact slewing bearings are used to achieve the slewing motion of mechanical equipment, support the weight and load of the equipment, and enable the equipment to rotate flexibly within a certain angle range.
– Working Principle: Both are based on the principle of rolling friction. The slewing motion is achieved through the rolling of the balls in the raceways, reducing the friction resistance and improving the rotation efficiency.
– Materials and Manufacturing Processes: The materials used to manufacture double-row ball slewing bearings and four-point contact slewing bearings are usually high-strength alloy steels, which are processed through multiple processes such as forging, heat treatment, and machining to ensure good strength, hardness, and wear resistance.
– Maintenance: During the use process, both double-row ball slewing bearings and four-point contact slewing bearings need to be regularly maintained, including cleaning, lubrication, and inspection of the wear of the balls and raceways, etc., to extend their service life and ensure the normal operation of the equipment.
Double-row ball slewing bearings and four-point contact slewing bearings have certain differences in structural features, load-bearing capacity, rotational flexibility, installation methods, and application scenarios. However, they have many similarities in functional roles, working principles, materials and manufacturing processes, and maintenance. In practical applications, it is necessary to select the appropriate type of slewing bearing according to specific equipment requirements and working conditions.
Prices of Slewing bearings
There are many factors that affect the price of slewing bearings. Firstly, the raw materials matter. High-quality steel has a high cost, and products made from it have excellent performance and a long service life, thus having a higher price. Secondly, slewing bearings with complex manufacturing processes and high precision requirements require advanced equipment and strict quality control, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be.
Supplier of Slewing bearings
In terms of quality, ldb bearing company has achieved excellence. Every link from the incoming inspection of raw materials to the delivery of finished products is strictly controlled. Multidimensional inspections are carried out on raw materials to ensure that their quality meets the standards. During the production process, each processing procedure is strictly supervised, and detailed records are kept. With its excellent product quality, strong technical strength, and complete service system, ldb bearing company has become a benchmark in the slewing bearing industry. In the future, it is believed that it will continue to uphold the concept of innovation and quality first, shine more brightly in the global market, and contribute more to the development of various industries.
