First Slewing Bearing Small Factory

1.Design of slewing bearing

What are the general selection steps for slewing bearings?

1. The scientific name of slewing bearing is slewing bearing. Before selecting the type of slewing bearing, the operating environment and working conditions must be clarified first.

2. Determine the maximum load on the slewing plate bearing. This load must include both dynamic and static loads applied to the slewing bearing. The load applied to the ferrule should be converted into an equivalent load acting on the center of the slewing ring.

Some must-notes:

· All external forces acting on the slewing bearing and gear, not only the rated load or working load, but also the load that may be suddenly generated when the equipment is stationary, such as the effect of strong wind on large buildings, etc.

· Possible loads in case of overload or test

· Loads generated during installation and removal

· Weight of all structures supported by slewing rings

· The sum of all possible loads. For example, a crane has various changes in load and working radius during normal use and overload testing.

3. Multiply the calculated load by the appropriate safety factor.

4. If a complete gear is required, the load to be carried by the gear needs to be determined. The calculation method is the same as the slewing bearing load and should take into account all possible situations; these include operating, stationary, tilting, and overload testing, to name a few. Another thing to note is the type of load in each case.

5. After the installation layout is determined, the position of the large and small gears, the installation and subsequent maintenance of the slewing bearing and the fastening bolts need to be considered.

6. Refer to the “Product Overview & Selection Guide” in the LYMC Slewing Bearing Operation Manual to select the slewing bearing series required for each location.

7. By comparing the previously calculated load and safety factor of the slewing bearing with the bearing characteristic curve of the slewing bearing, we can make a preliminary selection of the slewing bearing. Make sure that all load combinations are below the load characteristic curve. In many cases, we now have several options for slewing bearings, all of which can meet the load requirements.

8. If possible, check the gear load capacity of the selected slewing ring.

9. Confirm that the arrangement of fixing bolts, fixing plates and joints is suitable for installation.

2. Selection elements of slewing bearing

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, and at the same time, the moment of inertia is reduced for the occasions where the rotational speed is high and the structural deformation is required to be small.