bulk slewing bearing series

1.How to reduce slewing bearing tooth noise

The slewing bearing can stably support the equipment for slewing motion, also known as the turntable bearing. The mechanical equipment needs to be rotated 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 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?

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 frequency of start-stop or forward and reverse rotation 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 louder the noise. 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, which will generate 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 will 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.Correct selection can increase the service life of the slewing bearing

1. Use environment

In the selection stage of the slewing bearing, the use environment should be described in detail. The following are several common use environments:

Wet environment: Water vapor should be prevented from entering the channel and corroding the bearing surface. Long-lip seals or multi-lip seals should be selected, or even multiple sets of seals should be added.

The large contact area between the seal and the bearing can effectively prevent the entry of water vapor, and the bearing surface is anti-corrosion. Treatment such as galvanizing, etc., prevents the bearing from rusting and corroding, resulting in fracture failure.

High temperature environment: use high temperature resistant materials, metal retainer or glass fiber retainer for retainer, high temperature resistant rubber such as fluorine rubber for sealing, and high temperature grease for grease.

Dusty environment: The main way to effectively prevent dust from entering the channel is the selection of seals, which is the same as the selection method in wet conditions.

2. Speed

The description of the rotation speed of the slewing bearing in the selection stage is not the number of revolutions per minute that we usually talk about. In fact, the slewing bearing is not used at a constant speed in many occasions. In the design, we will provide the limit speed, slewing The bearing can not be used for more than the corresponding specified time under the state of the limit speed.

Due to the high speed, the bearing temperature will be too high and the heat dissipation will be poor, resulting in channel burns, rolling element burns, and damage to the slewing bearing. Choose a high-speed slewing bearing. Bearings shall meet, integral copper retainers, high temperature seals and grease.

3. Load

There are various types of slewing bearings to choose from according to different load conditions. The load is divided into axial load, radial load and overturning moment.

Under the condition that the diameter of the slewing bearing remains unchanged, increasing the diameter of the rolling element can effectively increase the bearing size. The overall retainer can make the force of the rotating bearing more uniform.

In the selection stage of the slewing bearing, the description of the working conditions is very important. The more detailed the description, the more perfect the engineer’s selection and design, and the more suitable for the customer’s use.