Ways to reduce bearing noise

Ways to reduce bearing noise

Ways to reduce bearing noise

(1) Method of using chemical additives

Adding certain chemical additives to the bearing lubricant can reduce bearing noise. For example, a low-noise grease containing noise-reducing additives produced by a factory in Tianjin can reduce bearing noise by 3.9-9.2dB from the original basis. , Suitable for use in miniature or small bearings.

(2) Use vibration absorption or vibration isolation device

The use of vibration absorption or vibration isolation devices to reduce bearing noise or isolate bearing noise can achieve good results, but this often pays a great price in economics. Sometimes the mechanism becomes larger, the heat dissipation condition becomes worse, or it is easy to rust. Consider that this method should only be used after other measures are taken and the low-noise index cannot be achieved.

The simplest example is a radial ball bearing that can take the thrust instead of a thrust bearing at high speed. The outer ring can be covered with a plastic jacket that is full of rust-proof lubricating oil. A thrust bearing with a casing or a general thrust bearing is allowed In this case, the inner hole or outer circle is inlaid with the same plastic sleeve, but the control should not rub or interfere with adjacent parts during rotation. This method has a certain muffling effect.

Another example is to add an intermediate sleeve between the bearing and the housing hole, which can attenuate the vibration force transmitted from the rotating system to the bearing housing, but this requires proper adjustment, otherwise the opposite effect may occur.

Another example is to use a sound-absorbing and sound insulation cover to completely close or close the bearing system where noise occurs. The interior of this noise reduction cover is made of glass fiber or polyurethane foam, and the inner surface is a steel plate with a thickness of 0.6-lmm. The surface is evenly distributed with small through holes of φ1.2-1.5mm. The total area of ​​the small holes is about the entire interior. 25%-30% of the surface, the outer surface is a steel plate with a thickness of 2mm.

Here, glass fiber or foam is used to eliminate higher frequency noise, the inner surface with small holes is used to eliminate lower frequency noise, and the thick steel plate on the outer surface is used to isolate the noise from outside.

(3) The method of changing the speed of the corresponding part of the host

The noise of rolling bearings is not very sensitive to the load, but very sensitive to the speed. When conditions permit, the method of reducing the speed and increasing the torque can achieve the same working purpose, but it reduces the noise.

[Example] In order to reduce the noise of the oil pump system, the original oil pump with a flow rate of 10L/min at a motor speed of 1430r/min was changed to a motor with a speed of 710r/min and a larger oil pump to obtain the same flow. Later, the noise of the oil pump itself, the oil pump bearings and the oil pump motor bearings were significantly reduced, but the space occupied by the entire mechanism has been expanded, and the cost has also increased.

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