Precautions when using variable speed FAG bearings

1. Understand the shape and connection dimensions of the variable speed drive FAG bearing.
2. Variable speed drive FAG bearings can be placed horizontally or vertically or tilted. Can be rotated forward and backward. Positive and negative input and output power (ie deceleration or speed increase).
3, variable speed transmission FAG bearing regardless of the installation method, and its couplings have size matching requirements.
Recommended:
The inner ring hole d and the shaft are matched by H7/h6;
The pin hole do of the middle ring and the transmission are matched by H7/r6;
The outer ring D and the housing are matched by H8/h7;
The gear is matched with the hole on the output shaft by a clearance fit, and the gap is 0.2~0.5mm.
4. Axial positioning of variable speed transmission FAG bearing: After any three turns of the ring are axially positioned, the other two axes do not need to be axially positioned.
5. Positioning in the direction of rotation; both the outer ring and the inner ring are flat key positions. The middle circle is positioned by the drive.
6. Variable speed transmission FAG bearings can withstand small external forces in the radial direction, but should not withstand large working loads.
7. Transmission ratio is the transmission ratio according to the first installation method. If other installation methods are used, the gear ratio should be calculated.
8. At the rated speed (1500 rpm), select the variable speed drive FAG bearing model according to the transmission ratio and the required power (Kw).
9. When based on the working torque, the model number should be selected accordingly.
10. The selection of the reducer model should be consistent with the model of the variable speed drive FAG bearing.

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Rolling noise analysis of NSK bearings

    The rolling sound is due to the rolling of the rolling elements in the raceway when the NSK bearing rotates to excite a smooth and continuous noise, which only attracts attention when its sound pressure level or tone is extremely large. In fact, the sound energy excited by the raceway sound is limited. For example, under normal conditions, the quality of the 6203NSK bearing raceway is 25~27dB. This type of noise is the most typical of single row deep groove ball NSK bearings that can withstand radial loads. It has the following characteristics:
a. Noise and vibration are random;
b. The vibration frequency is above 1 kHz;
c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;
d. When the radial clearance increases, the sound pressure level increases sharply;
e. NSK bearing housing rigidity increases, the lower the total sound pressure level, even if the speed increases, its total sound pressure level does not increase much;
f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and shape of the soap fiber can affect the noise value.
    The source of the rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise. As we all know, even if the NSK bearing parts are processed by the highest modern manufacturing technology, there will always be a small geometric error in the working surface, so that small fluctuations between the raceway and the rolling body will stimulate the natural vibration of the vibration system.
    Although the raceway noise of the NSK bearing is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of NSK bearings and the precise use of NSK bearings for noise reduction and vibration reduction.

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