The difference between vibrating bearings and ordinary bearings

Core Tips: 1 Appearance characteristics Vibration special bearings: A. The diameter of the rolling element is increased, and the length of the rolling element is increased. B. The cage guides the rollers from the outer ring ribs to reduce the force on the rollers. C. Use inner ring block
1 appearance characteristics

    Special bearings for vibration:

    A. The diameter of the rolling element is increased, and the length of the rolling element is increased.
    B. The cage guides the rollers from the outer ring ribs to reduce the force on the rollers.
    C. Use the inner ring rib to guide the roller to improve the roller operation.
    D. The cylindrical roller bearing cage adopts a monolithic structure and the strength is greatly improved.
    E. The outer diameter of the self-aligning bearing is designed with oil groove and oil hole, and the lubrication effect is good.

    Ordinary bearing:

    A. The roller body diameter and the rolling element length are both small.
    B. The cage has a roller or inner ring guide.
    C. Cylindrical roller bearing cage adopts rivet structure, which is easy to loosen and cover.
    D. The outer diameter of the self-aligning bearing has no oil groove oil hole, and the lubrication effect is poor.

    2. Selection of materials

    Special bearings for vibration:

    A. The inner and outer rings and rolling elements are vacuum degassed bearing steel, which has good fatigue resistance.
    B. The cage is made of aluminum-iron-manganese bronze material with high strength, good elasticity and better wear resistance.

    Ordinary bearing:

    A. The inner and outer rings and the rolling elements are made of ordinary bearing steel.
    B. The cage is made of zinc brass with low strength and poor elasticity.

    3. Heat treatment method

    Special bearings for vibration:

    A. The inner and outer rings are made of shell-mamming quenching or martensitic quenching + high temperature tempering, with uniform hardness and small internal stress; good toughness, impact resistance and vibration.
    B. When working within 150C temperature, the stability is good.

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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.

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