The bearing lubricant is right! Not only reduce noise, but also extend the bearings of the bearings
June 26, 2022
Small and medium size motors are usually equipped with rolling bearings. For this type of bearing for motors, people usually call them motor bearing. The lubrication of the motor bearing is when the three -dimensional fiber mesh structure in the lubricating fat is pulled off under the action of cutting, the precipted lubricant is on the bearing rotation element, bearing seat, and bearing cover.
When the bearing with lubricating fat starts to run, the fat is first thrown out of the rotating element, and quickly circulates and cools in the inner cavity of the bearing covered by the bearing cover. Then cut into the rotating ring from the outside of the rotating bearing set to the rotating element, closely attached to the part of the part of the surface of the rotating element, and the fiber mesh structure was broken under shear, so that the precipitated small amount of lubricant oil was A layer of lubricant is formed on the surface. The remaining part of the lubricating fat still maintains the original fiber mesh structure, playing a sealing and cooling role. When the bearing starts to run, the turbulence of the lubricating fat generates frictional heat to maximize the temperature of the bearings. With the continuous cutting effect analyzes lubricating oil, after forming a layer of lubricating membrane on the bearings of the bearings, the bearing seat and the bearing set of the bearing seat and the bearing sleeve gradually decreased. At the same time, the lubricating fat that is constantly thrown out of the rotating element plays a good cooling role in the inner cavity of the bearing, and also promotes the temperature of the bearing to gradually decrease. Finally, the temperature tends to a balanced value. The lubricating fat is not adhered to the metal surface to lubricate the lubrication in the motor bearing, but continuously circulates in the sealing bearing empty cavity like liquid. That is, it is constantly thrown out of the rotating element to the bearing empty cavity, and returns from the cavity to the rotating element. Repeated cutting and cooling are repeatedly cut to ensure that the bearings do not have abnormal temperature rise. Because of this, the lipids filled in the motor must maintain a certain space, and the amount of fat is generally controlled to 1/3 of the entire cavity. The left 2/3 space can ensure that the lubricating fat thrown on the rotation element is fully cooled and returned to the rotating element to achieve the purpose of controlling heating. However, the amount of fat should not be too small, otherwise the fats thrown from the rotation element cannot be returned to the rotating element, resulting in insufficient lubrication of the bearing.
The performance requirements for motor bearing for lubrication are: ① Good adaptability, high and low temperature performance, can be commonly used indoors, north and south; ② Lubrication, good abrasion resistance, not shaking oil, not drying, not emulsification, no loss, lubricating fat itself should not contain solids; ③ The antioxidant performance is good. After long -term use, the appearance color and pH of the grease change are small, and there is no obvious oxidation; ④ Good liquidity. Generally, the use temperature is required to be -25 ~ 120 ° C, the starting power torque is small, the operating moment is low, the power consumption is low, and the temperature is low; ⑤ Good water resistance, strong anti -rust resistance, and strong salt -resistant and fog ability, which can be suitable for harsh environments; ⑥ The insulation level is A, E, and B, and must not contain sulfur and chlorine pole pressure additives; ⑦ can extend the maintenance cycle, reduce bearings consumption, and long service life; ⑧ Appropriate consistency, have a good vibration reduction effect, and reduce the noise of the motor, which is conducive to environmental protection. With the strengthening of people's environmental consciousness, the requirements for environmental protection have also increased, and reducing noise and vibration has become an important indicator of the human living environment. The noise and vibration of the bearings directly affect the quality of similar equipment such as motors and fans, and reduce the noise and vibration of the bearing bearing bearing and vibration. It should be an important indicator to distinguish the quality of the bearing bearing. However, practice has proved that the quality and characteristics of lubricating fats are important factor in except for the design, material and manufacturing level of the bearing of bearing noise and vibration, except for the design, material and manufacturing level. The addition of lubricating fat can form a certain thickness, continuous and stable lubricating oil film on the surface of the bearing channel to reduce the amplitude, thereby reducing the absolute value of the vibration speed and vibration acceleration, which can effectively suppress the vibration of the bearings. Experiments have proved that different lubricating fats have different effects on vibration. The abnormal noise of the bearing is closely related to the positive and sizes of the lubricating fatty characteristics of the contact area. It is generally believed that the basic oil viscosity is low, but the sealing bearing speed of the motor is high. From the perspective of temperature rise and energy consumption, it is better to use low viscosity Base Oil. Essence In mineral oil, selection of alkyl oil is better than paraffin base oil, because its noise is smaller than the latter. For thick agents, the greater the length and width of the metal soap, the greater the noise. Composite soap encourages noise, so composite lithium -based fat is not suitable for motor bearing fat. Polyal lipid noise is relatively low, suitable for motor bearings. In addition, the consistency is low. Molybdenum, graphite, and nitrite will increase the noise of fat. Therefore, the use of motor bearing fat should not contain these substances, and the dust and particles in the air will also affect the noise of the fat. Therefore The total impurities content is strict. In order to maintain long term use of the bearing, the noise does not increase. In the process of long term use, lubricating fat can always maintain a uniform oil film on the bearing surface to prevent bearing scratching and wear, reducing vibration, thereby achieving the purpose of reducing noise. Therefore, the most fundamental requirement for motor bearing lubrication is long life, no oxidation, good water diligence, good attachment, low oil split rate, and good liquidity at high temperature. The bearings are not worn, and the oil membrane is kept uniform to achieve the purpose of not increasing noise.
