ntn bearing raceway noise and sound check

1: ntn bearing raceway noise:
1. To avoid the rolling force on adoption, which requires assembly and disassembly inner ring (shaft loop), through the force on the inner ring, outer ring assembly and disassembly time) by force on the outer ring.
2. Drag force due to continue until the extent of, for example, when installing the bearing mounted in the bearing to the right location just stop
3. Force on the size of the appropriate steady uniform should not have impact, and this requires a stable oil pressure or tension or pressure can exert a tool, when it had to use the hammer, but also through the copper sleeve instead of the more soft scrap metal falling to the buffer, as gently tapping force. Best to use copper, or pink woodsorrel for hammering. Insulating paint out of the acid volatile There are four main components: ① the reaction of low molecular weight did not paint the acid composition (anhydrous different o-and p-phthalic acid, anhydrous maleic acid, maleic acid, trans) . ② paint curing the resulting acid composition (phenolic degeneration paint, by the formaldehyde water into acid).
③ heat or oxidative decomposition of the lower fatty acids (formic acid, acetic acid). ④ solidified paint can be limited, as in normal circumstances, high quality sound for the 6203 roller bearings 25 ~ 27dB. This kind of noise to support radial load single row deep groove ball bearings as the most typical, it has the following characteristics: a. noise, vibration is random; b. vibration frequency above 1kHz; c. whether the changes in speed, noise dominant frequency almost unchanged while the sound pressure level is increased with the speed increase; d. When the radial clearance increases, the sound pressure level increased dramatically; e. bearing stiffness increases, the lower the overall sound pressure level, even if the speed increases , also increased its total sound pressure level is not
; F. lubricant viscosity, the higher the sound pressure level lower, but for grease lubrication, the viscosity, soap fiber size can affect the shape of the noise value.
2: ntn bearing sound check:
1, 2 lip seals structural differences:
2 lip seals bearing the foreign roots thin and thick end, and the end contour upward. 2 3 lip in between the lip and the storage space. 2 lip domestic bearing uniform thickness, 2 3 lip lip and the area between the external memory is not going to achieve mud, dust effect.
2, three oil ring seal lip contact with the rejection of interference in different volume or space volume:
Imports bearing the seal lip 2 interference was smaller, compared with 3 lip gap seal, a lip bearing interference with the domestic equivalent amount. Overall, foreign bearing seal for low torque, friction torque, the amount of interference, the contact forces are small, bearing temperature should be lower than the domestic bearing temperature rise.
3, 3 lip seals structural differences:
Foreign and domestic 3 lip seals bearing the opposite direction, and lip imported bearings and seals thrown 3 for the gap between the oil ring. When the bearing rotation, the temperature increases, the bearing gas pressure within the space bound to rise.
If there is intermittent noise, then scroll parts may be damaged. This sound occurs in the rolling out of date when the damage to the surface is, if the bearing pollutants often cause hissing sound. Serious damage will have the same commitment and huge irregular noise. Bearing damage can certainly perceptible by listening to, but usually at this time has to be immediately replaced bearing water and dirt can not defect, most likely develop into rust. The corrosion is caused poor installation, early wear and fatigue of the sources of pollution, serious corrosion of lead bearing scrap.

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