Low noise sealed bearing grease

Core Tips: Foreign low-noise sealed bearing greases are roughly divided into three categories: general low-noise motor bearing grease, low-temperature high-speed bearing grease, high-temperature long-life low-noise bearing grease. General
Foreign low-noise sealed bearing greases are roughly divided into three categories: general low-noise motor bearing grease, low-temperature high-speed bearing grease, high-temperature long-life low-noise bearing grease.

    1. General low noise motor bearing grease

    In the bearing industry, this grease is used in the largest amount, accounting for about 70% of the total grease. Because this type of grease uses a soft, easy-to-filter lithium soap as a thickening agent, using mineral oil as a base oil, it is easy to meet the requirements of low and medium-end bearings to reduce the vibration value. Another advantage is that it has good pumpability, whether it is mechanical fatliquoring or manual grease application. Moreover, the grease is inexpensive and can greatly reduce bearing costs. However, due to the use of mineral base oils, these greases have been compromised in terms of physical and chemical properties other than rust and rust resistance. If the bearing life can only reach 200 hours, the starting and running torque will be difficult to test at -20 °C. The grease is generally used at a temperature of -20 to 120 ° C. When used at a high temperature of 150 ° C or higher, the base oil evaporates too quickly and the loss is severe, which greatly shortens the service life of the bearing.

    2. Low temperature high speed bearing grease

    At present, the use of precision bearing equipment is becoming more and more refined, and the grease used in bearings must have the following properties:

    (1) It has the same operating life as the bearing, prolongs the maintenance cycle, shortens downtime and improves labor productivity.
    (2) Under the high speed of dn>5×105, it is necessary to ensure that the motor temperature rises low and does not lick oil, thus reducing power consumption and protecting the motor.
    (3) The impurity content is controlled under certain standards to minimize the pollution of equipment noise to the environment.
    (4) Guarantee the flexibility of starting and running the bearing under ultra-low temperature working conditions to ensure the minimum output power.

    Foreign grease companies use high-purity chemical synthetic oils and some special additives to develop and produce low-temperature high-speed bearing greases in high-purity environments and equipment. The disadvantage of this kind of grease is that when it is used over 150 °C, its life decreases sharply with the increase of temperature, and the load and impact resistance are weak. It should be avoided on medium and large bearings to prevent the boundary lubrication. sintering.

    3. High temperature long life low noise bearing grease

    Greases used in high temperature and high speed environments should have the following characteristics:
    (1) It does not lose at high temperature, that is, maintains a certain consistency at a temperature of about 180 ° C, and does not soften.
    (2) Less grease leakage. When the grease is subjected to high-frequency repeated shearing and large centrifugal force in the bearing, the lubrication can be recirculated to the raceway in time.
    (3) These greases must have a certain high temperature service life and have good oxidation resistance at high temperatures, thus prolonging the life of bearings and related equipment.
    (4) It has a certain mute effect. Because the fiber of high-temperature grease is generally hard, the mute performance in the bearing noise test is far less than that of lithium-based grease.

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Bearing lubrication

Core Tip: The purpose of bearing lubrication: The purpose of lubrication of rolling bearings is to reduce the internal friction and wear of the bearing, to prevent burning, and its lubricating effect is as follows. (1) Reduce friction and wear. In the formation of bearings
The purpose of bearing lubrication:
    The purpose of lubrication of rolling bearings is to reduce internal friction and wear of the bearings, to prevent sticking, and the lubricating effect is as follows.
    (1) Reduce friction and wear.
    In the mutual contact portion of the ferrule, the rolling element and the retainer constituting the bearing, metal contact is prevented, and friction and wear are reduced.
    (2), prolong the fatigue life.
    The rolling fatigue life of the bearing is prolonged when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the thickness of the lubricating oil film is not good, it is shortened.
    (3), discharge friction heat, cooling.
The circulation oil supply method or the like can be used to discharge heat generated by friction or heat from the outside to cool. Prevent the bearing from overheating and prevent the lubricant from aging itself.
    (4), other
    There is also the effect of preventing foreign matter from entering the inside of the bearing or preventing rust and corrosion.
    Lubrication method:
    The lubrication method of the bearing is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing and comparing the advantages and disadvantages of grease lubrication and oil lubrication.

Cylindrical Roller Bearings
    The cylindrical roller is in line contact with the raceway, and has a large radial load capacity, which is suitable for bearing heavy loads and impact loads. It is also suitable for high-speed rotation of N-type and NU-type axial movement, and can be adapted to thermal expansion or installation error. The change of the relative position between the shaft and the outer casing is most suitable for the free end bearing type NJ and NF type to withstand a certain degree of unidirectional axial load. The NH type and NUP type can withstand a certain degree of bidirectional axial load inner or outer ring. Separable, easy to assemble and disassemble NNU type and NN type, strong rigidity against radial load, mostly used for machine tool spindle
    Mainly applicable cages:
    Steel stamping cage (Z-shaped), copper alloy cutting cage, pin cage, synthetic resin forming cage
    The main purpose:
    Medium and large motors, generators, internal combustion engines, gas turbines, machine tool spindles, reduction gears, loading and unloading machinery, various industrial machinery
    Solid needle roller bearing
    The basic structure of the inner ring bearing is the same as that of the NU type cylindrical roller bearing, but due to the use of the needle roller, the volume can be reduced, and the large radial load can be withstood without the inner ring bearing. The mounting surface of the shaft with appropriate precision and hardness should be used as the mounting surface. Raceway surface
    Mainly applicable cages:
    Steel stamping cage
    The main purpose:
    Automotive engines, transmissions, pumps, excavator track wheels, hoists, overhead cranes, compressors
    Tapered Roller Bearings
    This type of bearing is equipped with a circular table-shaped roller. The roller is guided by the large rib of the inner ring so that the apexes of the conical surfaces of the inner ring raceway surface, the outer ring raceway surface and the roller rolling surface intersect on the bearing center line. One-point single-row bearing can withstand radial load and one-way axial load. Double-row bearing can withstand radial load and two-way axial load. It is suitable for bearing heavy load and impact load. It is divided into small cone according to contact chest (α). Three types of angle, middle cone angle and large cone angle, the larger the contact angle, the greater the axial load capacity. The outer ring and inner component (inner ring and roller and cage assembly) can be separated for easy assembly and disassembly, rear auxiliary The bearing code "J" or "JR" has international interchangeability. This type of bearing also uses the British series.

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