The vibration of the bearing is manifested in the form of noise through the transmission of air, and the noise is often caused by excessive bearing vibration, bearing enterprises generally use the method of measuring vibration values to evaluate the vibration and noise of the bearing. To reduce the vibration of the motor bearing, in addition to the design, material and manufacturing process of the bearing, the selection of grease is also an important factor, the impact of grease on the bearing vibration value mainly has the following points:

(1) Influence of fat viscosity on bearing vibration value

For the same type of grease, the vibration level of the bearing generally decreases with the increase of the viscosity of the grease base oil. In soap-based greases, the grease with low consistency is less noisy than the fat with high consistency.

(2) The influence of the graininess of grease aggregates

In the case of general grease, as the length and width of the fiber (i.e. the granularity) increases, the vibration level of the grease increases accordingly. Small particle size, uniform dispersion, bearing vibration value fluctuation range is also small, aggregate, reactant particle size, uneven dispersion, will affect the vibration level and stability of the grease, vibration value fluctuation range is large.

(3) The influence of impurities in grease on the bearing vibration value

The content of solids (impurities, dust) in the grease has a significant impact on the bearing vibration value: in the manufacture of grease, raw materials and the environment will inevitably bring impurities, once mixed and not easy to remove.

When the bearing or grease is mixed with solid impurities, the bearing rolling body will cause vibration of the bearing through the solid object and make noise, so it is generally stipulated that granular impurities are not allowed in the grease.

(4) Influence of the amount of fat injection

Bearing filling grease amount should be appropriate. According to the technical requirements for the installation of rolling bearings, the filling amount of bearing grease should be 1/2 to 1/3 of the internal space of the bearing. The filling amount is small, and the local lubrication dose will be reduced when the bearing rotates, causing vibration; The filling amount is too much or too full, the running resistance of the bearing increases, the vibration increases correspondingly, and the grease is easy to overflow.

To reduce the bearing vibration value should pay attention to the following points:

a, improve the processing accuracy of bearings.

b, according to the use of bearing requirements to choose the appropriate grease.

c, grease in the production process, should keep the environment clean, avoid impurities with people, strengthen the filtration of raw materials; The grease is fully stirred during the reaction, so that the reaction is uniform and complete, and the reactants are uniform and refined; The finished fat is filtered through multiple filters to reduce the presence of impurities and large fat particles in the fat.

d, the preparation of grease should choose the appropriate viscosity of the base oil, reduce the consistency of the grease.

e, bearing filling grease grease injection amount should be appropriate, should pay attention to bearing production and installation of the environment clean  avoid impurities, dust into, reduce pollution.