Methods to reduce the noise of clutch bearings in high-speed operation. Most high-speed bearings are IKO bearings, which are mainly used in high-speed rotation occasions with light load. Clutch bearings are required to have high precision, high speed, low temperature rise and low vibration and a certain service life. So how to install the high-speed bearing?Method for reducing noise of IKO clutch bearing in high speed operation
Method for reducing noise of IKO clutch bearing in high speed operation
1. IKO bearing shall be installed in a clean room without dust. The bearing shall be carefully selected and matched. The spacer for bearing shall be ground. On the premise of maintaining the equal height of the inner and outer spacer, the parallelism of the spacer shall be controlled below 1um;Method for reducing noise of IKO clutch bearing in high speed operation
The bearing shall be cleaned before installation. During cleaning, the inner ring slope shall be upward, and the hand sensing shall be flexible without stagnation. After drying, the specified amount of grease shall be put in. In case of oil mist lubrication, a small amount of oil mist oil shall be put in;Method for reducing noise of IKO clutch bearing in high speed operation
Special tools shall be used for bearing installation, with uniform stress and no knocking;
Method for reducing noise of IKO clutch bearing in high speed operation
High speed performance index: DMN value 1.3 ~ 1.8x 106 / min
Service life (average): > 1500 H
The installation tool kit includes 36 impact rings, 3 sleeves and a rebound free hammer. These components are installed in a portable toolbox.
It is often used as the support of high-speed motorized spindle. It is the key kit of high-speed motorized spindle of internal surface grinder. I don’t know how to install high-speed bearings or improper installation, or even barbaric installation, accounting for 16% of IKO bearings that fail in advance.
The bearing installation tool TMFT 36 is designed to quickly and accurately install the clutch bearing while reducing the risk of bearing damage during installation. The reasonable combination of impact ring and sleeve can effectively transfer the installation force through the bearing ring of interference fit, so as to greatly reduce the risk of damaging the bearing raceway and rolling element.
Good results can be obtained by using vibration absorption or vibration isolation devices to reduce the noise of bearings or isolate the noise of bearings, but this often costs a lot in economy. Sometimes, the mechanism becomes larger, the heat dissipation conditions become worse, or it is easy to rust. It should be fully considered when using.
This method can be used only after other measures are taken and the low noise index can not be reached. A simple example is the centripetal ball bearing that bears the thrust instead of the thrust bearing at high speed. It can be sleeved with a plastic jacket filled with antirust lubricating oil on its outer ring.
The thrust bearing with housing or general IKO bearing can be inlaid with the same plastic sleeve in its inner hole or outer circle if allowed, but the control can not rub or interfere with adjacent parts during rotation.
This method has a certain silencing effect. Another example is to add an intermediate sleeve between the bearing and the seat hole, which can attenuate the vibration force transmitted by the rotating system to the bearing seat, but this requires proper allocation, otherwise the opposite effect may occur.
Another example is the use of sound absorption and sound insulation cover to completely close the bearing system with noise or as close as possible. The interior of the noise reduction cover is made of glass fiber or polyurethane foam, and the inner surface is 0.6- LMM thick steel sheet, evenly distributed on the surface.
φ 1.2-1.5mm small through hole, the total area of which accounts for about 25% ~ 30% of the whole inner surface, and the outer surface is 2mm thick steel plate. Here, glass fiber or foam plastics are used to eliminate high frequency noise. The inner surface with small holes is used to eliminate the low frequency noise, while the thick steel plate on the outer surface is used to isolate the noise.Method for reducing noise of IKO clutch bearing in high speed operation
The method of changing the speed of the corresponding part of the main engine the noise of the clutch bearing is not very sensitive to the load, but it is very sensitive to the speed.
If conditions permit, the same working purpose is achieved by reducing the speed and increasing the torque, but the noise is reduced. [example] in order to reduce the noise of the oil pump system, the original oil pump with a flow of 10L / min at a motor speed of 1430r / min is changed to a motor with a speed of 710r / min and equipped with a larger oil pump to obtain the same flow.
After that, the noise of the oil pump itself, the oil pump bearing and the IKO bearing of the oil pump motor are significantly reduced, but the space occupied by the whole mechanism is expanded and the cost is increased.
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