Method for reducing NSK bearing noise and maintenance and maintenance

(1) Using a vibration absorbing or vibration isolating device

The simplest example is a radial ball NSK bearing that can withstand thrust at high speed instead of a thrust NSK bearing. It can be fitted with a plastic jacket filled with anti-rust lubricant on its outer ring, a thrust NSK bearing with a casing or a general thrust NSK. The bearing, if permitted, is fitted with the same plastic sleeve in its inner or outer circumference, but the control must not rub or interfere with adjacent parts during rotation. This method has a certain muffling effect.

The use of vibration absorption or vibration isolation devices to reduce NSK bearing noise or isolate NSK bearing noise can achieve good results, but this often costs a lot of money, sometimes the mechanism becomes larger, the heat dissipation conditions become worse, or it is easy to rust. To be fully considered, this law will only be used after the other measures have not been adopted to achieve low noise indicators.

An example is the use of a sound-absorbing sound enclosure to completely enclose or substantially block the noise-generating NSK bearing system. The inside of the 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 uniformly distributed with small through holes of φ1.2-1.5mm, and the total area of ​​the small holes accounts for the entire inner surface. 25% to 30% of the surface, and the outer surface is a steel plate having a thickness of 2 mm.

Another example is to add an intermediate sleeve between the NSK bearing and the seat hole to attenuate the vibration force transmitted by the rotating system to the NSK bearing seat, but this requires proper deployment, otherwise the opposite effect may occur.

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 the outside.

(2) Method of changing the rotational speed of the corresponding part of the host

In order to reduce the noise of the oil pump system, the oil pump that was originally used at a motor speed of 1430r/min at a flow rate of 10L/min was changed to a motor with a speed of 710r/min and equipped with a larger pump to obtain the same flow rate. The noise of the NSK bearing of the oil pump NSK bearing and the oil pump motor is significantly reduced, but the space occupied by the whole set of institutions has been expanded and the cost has also increased.

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

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Maintenance, inspection, and abnormal handling of SKF bearings and damage measures

Maintenance, overhaul, and abnormal handling of SKF bearings

In order to maintain the original performance of SKF bearings in a good condition for as long as possible, maintenance, overhaul, and accident prevention are required to ensure the reliability of operation and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.

Damage and countermeasures of SKF bearings

In general, if the SKF bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and cannot be used. This early damage, as opposed to fatigue life, limits the quality of what is known as a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.

Regarding the damage state of the SKF bearing, for example, the jam of the ferrule rim of the roller bearing, as a cause, the lubricant is insufficient, unsuitable, the defect of the oil supply structure, the foreign matter intrusion, the SKF bearing installation error, the shaft If the deflection is too large, there will be coincidences of these reasons.

Therefore, it is difficult to know the true cause of the damage by only investigating the SKF bearing damage. However, if you know the use of SKF bearings, the conditions of use, the structure around SKF bearings, and understand the situation before and after the accident, combined with the damage state of SKF bearings and several reasons, it can prevent similar accidents from happening again.

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