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The raceways sound operation of the angular contact ball bearings, rolling element raceway scroll issued a slippery continuous sound, the unique sound of angular contact ball bearings will occur. The general sound of the bearing raceway sound and other sound. The ball bearing raceway sound is irregular, the frequency of 1000Hz or more, its main frequency does not change with the speed, but the total sound pressure level increases with engine speed to accelerate.
Roller Daosheng large bearing raceway sound SPL is reduced with the increase in viscosity; small bearing raceway sound, the level in the viscosity is increased to more than about 20mm2 / s, by reducing transfer is somewhat increased. The greater the rigidity of the bearing raceway sound overall sound pressure level is lower. Such as the radial clearance is too small, the total sound pressure level and the main raceway sound frequency will be increased dramatically with the reduction of the radial clearance.
Control raceway sound: selection of low the noise angular contact ball bearing, bearing waviness small, carefully selected conditions of use. The raceways sound often affect the mechanical noise to reduce the raceways sound can reduce the noise of the machinery.
The imported bearings accident injury are the following:
1, mechanical damage: severe in contact with the appearance of a metal peel and the emergence of a large area of clutter scratch; under normal circumstances, angular contact ball bearing mechanical damage to the bearing alloy appearance grooves of different levels. The contact surface damage and ablation phenomena exist bearing the mechanical damage caused mainly due to the appearance of the angular contact ball bearings difficult to form a film or film is severely damaged.
2, the bearing hole corrosion: plain bearings cavitation mainly due to vacuum the district formation of bubbles caused by the oil flow cross-section of the structural elements, such as oil groove and oil hole sudden change strong disorder, disorder of the oil flow, followed As the pressure increases, the bubble collapse destroy arising Cavitation. Cavitation generally occurs in the high load region of the bearing, such as on the lower pad of the crankshaft main bearings.
3, fatigue pitting: overworked engine, angular contact ball bearing fatigue pitting. Angular contact ball bearings overheating and excessive bearing clearance, cause bearings central fatigue damage, fatigue of pitting or fatigue shedding. Most of this damage because of the overload, the bearing clearance is too large, or oil dirty within mixed due to a foreign body. Therefore, when used should be noted that to prevent the bearing overload work not to excessively low or high speed operation; idle To engine adjusted to a steady state; ensure proper bearing gap, to prevent the engine speed is too high or too low; check, adjust the cooling system work, and work to ensure that the engine temperature is suitable.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NA5912 NSK | 60 | 85 | 34 |
| NA5911 NSK | 55 | 80 | 34 |