While NSK bearing under a radial load oil poor performance cases, the operation will initially hear "click, and click" noise, which is mainly due to the rolling, after leaving the loading area, sudden acceleration and cage of rolling noise of the collision sent, this crash is inevitable, but as the operation will disappear after some time.
Cage noise prevention measures are as follows:
A. to maintain stability in the Revolution movement, boot and the boot of races as possible should be adequate lubrication, structure of high speed angular contact ball bearings under the condition of improvements, changes the roller guide l-shaped cage boot Z-ring ribs cage.
B. bearing when spinning, bearing vibration of its cage Pocket Hole clearance amplitude than small pocket hole clearance cage vibration amplitude, Pocket Hole clearance values are particularly important.
C. Note as far as possible to reduce the radial clearance.
D. as possible to maintain accuracy, improved cage surface quality, conducive to reducing collision between rolling elements and cage or friction noise.
E. active use of advanced clean technologies, to spare parts and products for effective after thorough cleaning, improving the cleanliness of bearings.
1, selection and control of shaft and housing tolerances: press bearing into should be rotational flexibility without blocking. If there is clearly turning the inflexible, it indicates that the axis dimensions are too large, tolerance to go down. Angular contact ball bearings are pressed into the shaft turn by hand after apparent "Salsa", the tolerances of the shaft may be too large or the roundness of the axis bad. So when the control shaft and housing tolerances to control the roundness, many domestic manufacturers currently control the tolerance, not to control the roundness.
2, SKF bearing Assembly: bearing is a high precision products, such as improper Assembly could easily Bias the ball bearing Raceway damage, cause damage to the bearings. During Assembly of the bearing should be dedicated mold, able to beat, only small forces when pressed into the shaft, pressure ring only ring stress. Requirements when using pneumatic or hydraulic Assembly, at the time of pressing the touch outside to level up or down status, such as tilt will cause damage to the bearing Raceway due to stress and the bearing rings.
3, assemble foreign object prevention: angular contact ball bearings into the rotor dynamic balance easily will enter the bearing dynamic balancing produced when iron filings, and is therefore best done before the load bearing dynamic balancing. Some manufacturers for ease of Assembly, Assembly in the bearing Chamber coated with oil or grease lubrication, but often operations staff is difficult to control, if oil or grease in the bearing Chamber accumulates more in the bearing rotates easily along the shaft into the bearing. Preferably do not oil or grease the bearing room, if not not to control shall not be over bearing Interior accumulates.
4 Prevention of rust, paint: paint the rust is characterized by multiple sealed-type motor, motor Assembly, sounds very good, but after some time in the warehouse, the electrical noise gets so big, angular contact ball bearings with serious rust is removed. Many manufacturers are considered to be before bearing problems, through our advocacy, electrical machinery plant has been realized mainly insulating paint problem right now. The problem mainly because of the acidity of insulating varnishes containing volatile substances formed under certain temperature, humidity, corrosive substances, corrosion and cause damage to the bearings FAG bearing Raceway. The problem can only be chosen well varnished, and after drying after a period of ventilation Assembly.