Latest Products
We keep on updating and iterating our products, optimizing the structural design and creating a more scientific and reliable slewing drive device.
- Small aluminum housing gear type slewing d...
S-I-O-0169 spur gear slewing drives are used on small automation equipment, where the customer has extremely high req...
Detailed instructions Contact - The heavy duty inner gear slewing drive sc...
The S-III-I-0755 spur gear inner gear slewing drive with the same direction design makes the mounting surface on the ...
Detailed instructions Contact - Gear type slewing drive with integrated ca...
S-II-O-0541 gear type integrated base slewing drive is used on special automation equipment. The customer has precise...
Detailed instructions Contact - Vertically mounted high torque worm gear w...
Unique Transmission Equipment (Luoyang) Co., Ltd. has designed a type of large module, high torque, vertically mounte...
Detailed instructions Contact
Precision slewing bearing clearance selection and actual application
Publish time:2021/08/12 News Views:598
In order to let the precision slewing bearing to rotate smoothly to obtain an ideal runout value when in use, the clearance value will generally be small, zero or negative when designed and manufactured, the corresponding clearance value is generally 0 to 0.05. ≤0, -0.05 to -0.01, the corresponding preload is: no preload, light preload, heavy preload.
When processing, we can measure the raceway size according to the method of measuring the raceway size. According to the measurement data, calculate the clearance value (whether it is a positive clearance or a negative clearance), check the calculated clearance value after the processing is completed. Use a dial indicator to directly measure the clearance, for negative clearance, use a dynamometer to measure the slewing ring starting torque. According to the starting torque to judge the slewing bearing interference. The starting torque is also a value that must be known in the slewing bearing use, which determines the slewing bearing reducer and motor selection.
To measure the slewing bearing starting torque, the slewing bearing starting force must be measured first and a dynamometer is needed. Because the max starting force appears at the moment when the slewing bearing is about to rotate, so you need a dynamometer that can record the maximum value of the measurement, measure the driving force of the slewing bearing.
Starting torque = starting force * moment arm, starting force can be measured by dynamometer, we generally install a bolt on slewing bearing outer ring hole, use a dynamometer to measure the starting force of the slewing bearing at the bolt, the radius of the outer ring bolt hole distribution circle is the moment arm, the starting torque of slewing bearing is calculated by starting force and moment arm. For the same slewing ring, the difference in starting torque can reflect the size of the negative clearance slewing bearing clearance value, the starting moment is larger and the clearance value is smaller, then the preload is greater.
The clearance value selection should also consider the customer’s equipment situation. The slewing ring clearance values are smaller, the requirements for installation and use are higher. The flatness error of the installation foundation and the unbalance load in the use of the slewing bearing will cause the slewing bearing to be slightly deformed.
The slight deformation of the slewing bearing can be offset by the clearance when the clearance is large and the slewing bearing can rotate normally after installation. But if it is a small or negative clearance, the slewing bearing has no extra clearance to resist small deformations. If the slewing bearing is deformed, it will get stuck, rotate badly or even get stuck, causing damage or unusable.
Therefore, the selection of small clearance for precision slewing rings requires comprehensive slewing accuracy, machining accuracy of the equipment installation foundation, comprehensive analysis and evaluation of the user’s specific use conditions, then selecting the appropriate clearance value to ensure accuracy and ensure that it can be installed and used on site.


- High speed double input copper worm gear s...
- Causes and repairing methods of slewing ri...
- Analysis of the casting method of the slew...
- How to choose couplings when designing spu...
- Technical analysis of slewing bearing mate...
- How to choose the clearance of the spur ge...
- What are the similarities and differences ...
- Introduction to the connection mode of sle...