bearing angular contact ball bearings is mainly used in machine tool spindle. In most cases, locking the outer ring of this bearing the mouth and can not seal the resulting circular groove, so many used in the machine spindle angular contact ball bearings can not be used for other hosts as the other bearings as lubrication. If installing a set of auxiliary lubrication system, not only to increase costs and make the structure more complex machine. The advanced method is to use a new type of a groove in the ring embedded in the bearing, the groove depth slightly shallower than the standard bearing point, and just fit in the intersection part, fill in the gap left by the outer ring flange.
To join the ring not only stop the leakage of grease from the bearings on both sides, but also stop dirt from the bearing both sides of the intrusion.
bearing raceway sound is due to rotation of rolling bearing raceway of the rolling and inspire a smooth and continuous noise, only when the sound pressure level, or tone only caused great attention. In fact, Raceway to the sound of the acoustic energy is 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 features:
a. noise, vibration is random;
b. vibration frequencies above 1kHz;
c. Whether the changes in speed, noise, sound pressure level of the main frequency is almost constant and increased with increasing speed;
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 speed increases, the total sound pressure level has also increased much;
f. The higher viscosity of lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity, soap fiber size and shape can affect the noise value.
Sound source is generated Raceway after the rings are load due to the inherent vibration. As the rings and rolling elements of the elastic contact constitutes a nonlinear vibration system. When the lubricant or processing accuracy is not high and this will stimulate the inherent flexibility characteristics of the vibration, the air is passed to become noise. As we all know, even using the highest ultra-modern manufacturing technology to process bearing parts, the surface of their work there will always be varying degrees of small geometric errors, so that body roll Road and rolling generate small fluctuations between the natural vibration excited vibration system.