high speed ball slewing ring bearing in stock

1.How to reduce slewing ring bearing tooth noise?

The slewing ring bearing can stably support the equipment for slewing motion, also known as the turntable bearing. The mechanical equipment needs to rotate without the transmission. The slewing bearing can be made of external teeth or internal teeth, and the rotation of the slewing bearing is realized through the gear transmission.

In practical applications, the force of the slewing ring bearing is different, the speed of rotation is also different, and the teeth of the slewing bearing are also different. 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 bearing?

1. Control the tooth precision. Through long-term practice, we found that if we want to reduce the tooth noise, the tooth precision needs to be controlled at 7-8 grades. The higher the rotational speed, the higher the gear tooth precision requirements. Gear, tooth accuracy should be controlled within 7 grades.

2. Reduce the start-stop or forward and reverse frequency of the gear. Frequent start-stop or forward and reverse rotation will cause the gear to vibrate too fast, and the vibration will generate noise. The faster the vibration, the greater the noise. Reduce the start-stop or forward and reverse frequency, you can Reduce noise.

3. 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.

4. Reduce the occurrence of resonance. Resonance will produce high-frequency noise. When the motor rotates at a low speed or at a certain speed, the equipment will resonate, causing the gear and ring gear to oscillate at a high frequency and the two oscillating objects contact. High-frequency noise will be generated, which can generally be reduced by changing the speed or adjusting the position of the equipment.

5. Increase the roughness of the tooth surface. If the roughness of the tooth surface is very poor, it will cause point contact on 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 will be in line contact, and the noise will be very high.

6. Increase the lubrication of the tooth surface. Insufficient lubrication will lead to increased friction, and noise will be generated when the tooth surface is rubbed. Sufficient lubrication can reduce friction and effectively reduce noise.

2.What does the clearance of the slewing ring bearing mean and how does it affect the use?

Clearance is an important technical parameter of slewing ring bearing, which directly affects the technical performance of the bearing, such as load distribution, vibration, noise, friction, temperature rise, service life and mechanical running accuracy.

If the clearance is too large, the internal bearing area of ​​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 (interference) may appear in actual operation, and the rotation jamming will be inflexible, resulting in increased friction and heat, and temperature rise, thereby making the effective clearance smaller. Or the interference is larger, such a vicious circle will cause the bearing to lock and not rotate.

The clearance value of the bearing is artificially specified by the designer, and a certain range is divided according to the size of the slewing bearing, which is used as a reference value in the processing process.

Therefore, if it is not specially required by the operating conditions, the clearance of the bearing can allow an error within 0.05 within the specified range, and this error is not enough to affect the quality of the slewing ring bearing itself. A larger error is not acceptable, it will cause the slewing bearing to overturn and shake, which will affect the use.

The clearance of the slewing ring bearing can make up for the installation error. If the clearance is too small and the installation plane is rough and uneven, the installation screw will warp after being pressed, the force will be uneven during use, and the rotation will be stuck.

In this case, first ensure the normal rotation of the bearing, and a large clearance is required to offset the error during installation. When designing, it is necessary to consider the flatness that can be achieved after the installation foundation is processed, and select the appropriate clearance.

Of course, the clearance value cannot be sloppy when the design rotation accuracy is high. Generally, zero clearance or negative clearance is selected to at least ensure that the bearing has no clearance.

When repeated positioning accuracy is required, the clearance is very important for the slewing bearing. important. Even if there is no special requirement for starting torque, the clearance value needs to be guaranteed to be within -0.02 to 0.

The influence of the clearance on the slewing bearing is very large. During the design, it is necessary to fully communicate with the user, understand the working conditions in detail, and select the clearance value reasonably to ensure that the slewing bearing is more stable and durable.