Cheap Price OEM Manufacturer Slewing Bearing

The design and selection of slewing bearing

The design and selection of slewing bearing and the consideration of key parameters, one is the rotation accuracy; the second is the realization of the bearing capacity; the third is the matching degree of the working conditions.

The fourth is the comprehensive consideration of design and selection, which is convenient, fast, safe and reliable.
Rotary slewing bearings have unique load-bearing characteristics and are commonly used on devices such as hoisting machinery, excavators, turntables, wind turbines, telescopes, and tank turrets.

Through the improvement of machining methods and the upgrade of design, the current slewing bearing can be applied to smaller, more complex and more precise occasions.

The correct selection of a slewing plate bearing depends on requirements such as load, stiffness, rotational speed, size and rotational flexibility. Design goals and bearing suitability are jointly selected by the customer and the manufacturer to help optimize system performance at the lowest cost and guaranteed trouble-free operation.

Usually the load capacity is the decisive factor in selecting the bearing section size and diameter, but other parameters determine which bearing type is best to choose.
1. If there is a large torque requirement, it is generally necessary to use double-row four-point contact ball bearings.
2. Increasing the stiffness generally requires the use of roller bearings.
3. The maximum load bearing requires the use of crossed rollers (two-row or three-row roller bearings)
For applications requiring increased rigidity and load bearing, large size bearings are required, but for applications with sensitivity requirements such as robots and manipulators, small size bearings are required.

The slewing bearing with smaller inner diameter makes the structure of the mounting member more compact and the total weight is reduced. At the same time, for the occasions with high rotation speed and small structural deformation, it also reduces the moment of inertia.

2.The influence of the structure of the slewing bearing on the selection design, cost and life

Slewing bearing is a special structural bearing that can bear large axial load, radial load and overturning moment at the same time. – Under normal circumstances, the slewing bearing itself has mounting holes, lubricating oil holes, sealing devices, and gears, which can meet the requirements of the working host under various working conditions; on the other hand, the slewing bearing itself has a compact structure and is easy to guide and rotate. ,

Easy installation, easy maintenance and other characteristics, so it is widely used in mining, mining, construction, port, medical and other aspects. The structure of the slewing bearing has a decisive influence on the selection. The four-point ball is the best in flexibility and fatigue resistance.

The double-row ball bearing is the first choice for marine bearings and crane bearings, automobile crane bearings and cement pump bearings; cross Roller bearings are often used for precision, measurement and control and positioning, and the speed is low. Three-row roller bearings are typical low-speed heavy-duty bearings.

The single-row four-point contact ball slewing bearing is composed of four parts: inner ring, outer ring, steel ball, and spacer block. It has a compact structure and light weight. radial force. Construction machinery such as rotary conveyor, welding manipulator, small and medium-sized crane and excavator can be selected.

The double-row ball slewing bearing has three races, and the steel balls and spacers can be directly discharged into the upper and lower raceways. According to the stress conditions, two rows of steel balls with different diameters are arranged.

This kind of open assembly is very convenient, and the bearing angle of the upper and lower arc raceways is 90°, which can bear a large axial force and tipping moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed.

The axial and radial dimensions of the double-row reducing ball slewing bearing are relatively large and the structure is tight. It is especially suitable for loading and unloading machinery such as tower cranes and truck cranes that require medium or larger diameters.

The single-row cross-roller slewing bearing consists of two races, with compact structure, light weight, high manufacturing precision, small assembly clearance, and high requirements for installation accuracy. Force, tipping moment and larger radial force are widely used in lifting and transportation, construction machinery and military products.

Three-row roller slewing bearings have three races with separate upper and lower and radial raceways, so that the load on each row of rollers can be determined exactly. It can bear various loads at the same time, and is the one with the largest bearing capacity among the four products.

The shaft and radial dimensions are large and the structure is firm. It is especially suitable for heavy machinery requiring large diameters, such as bucket wheel excavators, wheel Cranes, marine cranes, port cranes, molten steel running table and large tonnage truck cranes and other machinery.