Motorized spindle bearing raceway sound at the time of operation, the roller rolling on the surface of the raceway and issued a continuous sound, usually occur in all motorized spindle bearing characteristic sound.
General bearing ring raceway is combined with other sounds.
Ball bearing raceway is irregular, frequency above 1000 hz, its main frequency does not change with speed, but its total sound pressure level increases with speed to speed up.
Raceway large bearings, the rolling sound of sound pressure level decrease with the increase of the viscosity;
The raceway small bearings, the sound pressure level in the viscosity increases to about 20 was/s above, from decreased to increase somewhat.
And the rigidity of the bearing, the greater the raceway of the lower the total sound pressure level.
Such as radial clearance is too small, the total sound pressure level and race master frequency will increase sharply with the decrease of radial clearance.
Method to control the sound of raceway are: choose low noise electric spindle bearing is bearing waviness is very small, that is, carefully select and use conditions.
Race often affect the mechanical noise, reduce the raceway can reduce the mechanical noise.
Impact of the rolling element and its control method for larger models of ball bearings or cylindrical roller bearings under pure radial load speed, due to centrifugal force is lesser, roller in the rolling body will impact the load area or race and making noises.
But with the increase of rotational speed, the noise will disappear.
Control method of rolling body impact sound: decrease the radial clearance, materials for use with reasonable structure and flexibility of motorized spindle bearing cage.
Motorized spindle bearings in the rotation, bearing wear and failure due to friction.
Hinder the motorized spindle bearing rotating by rolling friction, sliding friction and lubricant friction resistance of three kinds of.
When the rolling element bearing rolling on rolling rolling friction;
Cage guide roller in the surface, keep guard guide surface and roller bearing in the roller end face and ring is happening on the guard sliding friction;
The lubricant friction by the lubricant at the contact of internal friction and lubricant of mixing and extrusion.
Thus the impedance bearing movement friction resistance for the three combined.
And the purpose of lubrication is grease and lubrication way avoid race, rolling element and cage direct contact between metal, reduce friction heat 'make to minimize friction, reducing wear and tear, prevent corrosion, prolong its service life.
Bearing about 80% used lubricating grease.
There are many types of bearing is the bearing factory to send the user to make use of their fat.
So someone called the grease bearing inner ring and outer ring, rolling body, keep frame four parts outside the fifth largest parts.
Illustrate the importance of grease for bearings.