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Jul 19 2023
Causes and Solutions for Abnormal Sound of Cross Roller Slewing Bearings
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The clearance of the slewing bearing has a great influence on the slewing bearing. During the design, it is necessary to fully communicate, understand the working conditions in detail, and select the clearance value reasonably to ensure that the slewing bearing is more stable and durable. The slewing bearing can be made of external teeth or With internal teeth, the rotation of the slew bearing is realized through the tooth transmission. In the process of gear transmission, the contact between the gear and the ring gear of the slewing ring will generate noise, so how to reduce the noise of the slewing ring?
1. The bearing clearance is too large or too small
If the clearance is too large, the bearing area inside the bearing will be reduced, the stress of the contact surface will increase, the rotation accuracy will decrease, and the vibration and noise will increase. As a result, the service life is shortened, and the clearance is too small. Negative clearance may occur in actual operation, and the rotation jamming will be inflexible, resulting in increased friction and heat generation, and increased temperature rise, thereby making the effective clearance smaller or the interference tighter. Large, such a vicious cycle will cause the bearing to lock and not rotate.
2. Setting of bearing clearance
The clearance value cannot be sloppy when the design rotation accuracy is high. Generally, zero clearance or negative clearance is selected, at least to ensure that the bearing has no clearance. When repeated positioning accuracy is required, clearance is very important for the turntable bearing. Even if there is no special requirement for starting torque, the clearance value needs to be guaranteed to be within -0.02 to 0.
1. Control the tooth precision
Through long-term practice, we found that if we want to reduce gear noise, the gear accuracy needs to be controlled at 7-8 grades. The higher the rotational speed, the higher the gear accuracy requirements. Should be controlled within level 7.
2. Reduce the impact load
The impact load will make the vibration frequency and torsion direction of the gear different, which will cause vibration in the circumferential direction, which will form a smooth noise. Reducing the impact load can reduce the noise.
3. Increase the roughness of the tooth surface
If the roughness of the tooth surface is very poor, it will cause the point contact of the tooth surface, and noise will be generated when the high point contact is made. If the roughness of the tooth surface is increased, the tooth surface is in line contact, and the noise generated by the flange slewing bearing will be very small.
4. Increase tooth surface lubrication
Insufficient lubrication will lead to increased friction, and noise will be generated when the tooth surface rubs. Sufficient lubrication can reduce friction and effectively reduce noise.
The above article summarizes in detail the influence of excessive or small clearance of the slewing bearing and the method to reduce the noise of the slewing bearing gear. If you encounter such problems, you can compare the above points and analyze it yourself. Reasons, make corresponding treatment, see if there is improvement, if not, you can contact us, SWBTEC is one of the most professional slew ring bearing manufacturers, focusing on the research and development and manufacturing of turntable bearings, slewing bearings, etc.
