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How to install slewing bearing?

Views: 7     Author: Site Editor     Publish Time: 2020-06-08      Origin: Site

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Slewing bearing is widely used in practical industry and is known as "the joint of a machine".  It is an important driving part of a machine that needs to perform relative rotary motion between two objects and bear axial force, radial force and tipping moment at the same time. This article focuses on how to install slewing bearing. 


Small Diameter Slewing Ring Bearing with Internal Gear


Here are the main points of the article:


  • How to install slewing bearing?

  • Install the plane of slewing bearing

  • Install the stiffness of slewing bearing

  • The positioning of slewing bearing

  • Install slewing bearing's solid bolts

  • Slewing bearing's first lubrication

 

1. How to install slewing bearing?

Firstly, open the packaging of slewing bearing, check the certificates and labels of slewing bearing, and make sure the model of slewing bearing is correct. The installation steps are as follows:

 

2. Install the plane of slewing bearing


Install the surface should be smooth and clean, to remove all the excess material such as paint residue, bead, burr, etc. Care should be taken not to let solvents seep into the slewing bearing.  Solvents that damage the sealing material should not be used. The mounting surface should be dry and lube free before assembly. Measures should be taken to protect workers and the environment. 


The roughness of the mounting surface of the mounting support shall not be greater than Ra=12. 5,6. 3 meters.  The error of the flatness of the mounting surface shall be detected in the circumferential error and radial error. The circumferential flatness tolerance value has a corresponding range of standard values with the slewing bearing diameter (refer to the relevant standard for details, the radial error is based on the actual flange width measurement, and the radial plane tolerance value is half of the circumferential tolerance value). In order to avoid local overload of slewing bearing due to the irregularity of the installation plane or bearing deformation, the circumferential flatness error can have only one wave fluctuation within any range of 180 degrees, and the change is gentle.    

 

3. Install the stiffness of slewing bearing


The standard slewing bearing and zero-clearance slewing bearing have different requirements on the rigidity of bearing. See the table below:

Raceway diameter (mm) 250, 500, 750, 1000, 1500, 2000, 2500, 3500


The allowable deformation amount (mm) of the standard slewing bearing ball type 0. 31 0. 40 0. 53 0. 60 0. 80 1. 0 1. 2 1. 5

Bearing 0. 24, 0. 30, 0. 36, 0. 41, 0. 53, 0. 60, 0. 68, 0. 90


The allowable deformation of the zero-clearance slewing bearing (mm) ball type 0. 22 0. 28 0. 35 0. 40 0. 50 0. 68 0. 80 1. 08

Bearing 0. 16, 0. 21, 0. 24, 0. 28, 0. 35, 0. 40, 0. 45, 0. 62

 

4. The positioning of slewing bearing


The inner and outer raceway of slewing bearing has a soft belt that should be placed on either side of the main load plane. Namely with the main load zone staggered 90 degrees. There is a blockage or an "S" mark on the soft tape. Also check that the slewing bearing is consistent with the mounting surface, usually with a feeler, and if the bearing is poor, fill it with the appropriate material. slewing bearing is prohibited from welding on bearing after installation. 

5. Install slewing bearing's solid bolts


(1) Selection of slewing bearing mounting bolts: the specified (size, quantity, strength class, etc. ) mounting bolts and washers shall be used. Also note: do not use full thread bolts.  Do not use old bolts, nuts and washers.  Do not use open washers such as elastic washers


(2) Selection of pre-tightening torque of slewing bearing bolts: the pre-tightening force of general metric bolts is recommended to be 0. 6-0. 7 times of bolt yield strength. Hydraulic fastening devices are recommended for bolts larger than Tighten slewing bearing bolts :slewing bearing shall be installed without load. Note: apply a little oil to the thread of the bolt to ensure the balance of friction resistance.  Do not apply glue to the bolt lock. Pre-tightening bolt: it should be divided into three stagger pre-tightening steps, the force of the three steps is respectively 30%, 80% and 100%. 


(3) Adjust the gear clearance of slewing bearing: it is important to correctly adjust the gear clearance when installing the toothed slewing bearing. It can be measured and adjusted with a feeler at the highest point of the radial runout of the gear, or by pressing lead wire or other suitable methods. If the side gap is not within the specified value, the movable pinion can change the center distance. After the adjustment, slewing bearing should be rotated at least one full circle to confirm that there are no other tooth jump points.  After the final fixation of slewing bearing, the lateral clearance should be checked again for false clearance. The highest point of gear radial runout is marked in the groove with green paint. 

 

6. Slewing bearing's first lubrication


(1) Slewing bearing raceway lubrication: in order to ensure adequate lubrication, grease specified in the drawings or product instructions shall be reapplied before initial use. Note in particular that all nozzles are filled with grease one by one, preferably by turning the slewing bearing until the grease is seen extruding from the seal. 


(2) Slewing bearing gear lubrication: when the gear lubrication, the tooth surface should be clean. It is recommended to brush the grease on the gear with a clean brush. 


I hope the introduction of this article will help you understand slewing bearing.  Our company specializes in producing all kinds of slewing bearings.  If you need slewing bearing, please contact us. 

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Xuzhou Wanda Slewing Bearing Co.,Ltd.
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   info@slew-bearing.com
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