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Raceway sound is due to NSK rolling element bearing rotation scroll through the raceway and inspire a kind of smooth and continuous noise, only when its sound pressure level or tone when aroused great attention. In fact, inspired raceway sound acoustic energy is limited, as in normal circumstances, high-quality sound of 6203 bearing raceway 25 ~ 27dB.
Rolling sound and control the impact of the larger models of ball bearings or cylindrical roller bearings in pure radial load low speed, the centrifugal force due to rolling body smaller, NSK Bearings in a non-load zone of rolling element will impact cage or raceway and noisy. However, as the speed increased, the sound will disappear. Impact on the rolling sound control methods are: appropriate to reduce the radial clearance, the use of reasonable structure supple material of the bearing cage.
This noise to withstand the radial load row deep groove ball bearings are the most typical, it has the following characteristics:
a. noise, vibration is random;
b. vibration frequencies above 1kHz;
c. regardless of how the speed of change, the main frequency noise is almost constant with the speed and the sound pressure level is increased with the increase;
d. When the radial clearance increases, the sound pressure level increased dramatically;
e.NSK bearing stiffness increases, the total sound pressure level is lower, even if the speed increases, the total sound pressure level has also increased little;
f. the higher viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity, the fiber shape and size soap can affect the noise value.
Raceway sound source is to be generated after the load caused by the natural vibration of the ring. Since the elastic rings and rolling contact with nonlinear vibration system constituted. When lubrication or machining accuracy is not high flexibility with this feature will be excited about the inherent vibration transmitted into the air then becomes noise. As we all know, even with the highest levels of modern manufacturing technology processing NSK bearing parts, the work surface there will always be varying degrees of tiny geometric errors, so that between the raceway and rolling elements excite vibrations produce tiny fluctuations inherent in the system vibration.
Although NSK Bearings raceway noise is inevitable, however, precision machined parts can be taken to the work surface, use the correct selection of bearings and precision bearings make noise damping.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7307ADF NSK | 35 | 80 | 21 |
| 7207CDF NSK | 35 | 72 | 17 |