Vibration bearing vibration group selection

Vibration bearings and plain bearings of the different characteristics

    1, Appearance Features
    Vibration bearings:
    A. rolling diameter increased, the rolling body length increased.
    B. outer rib cage guided by the roller, the roller to reduce the force.
    C. Use of the inner wall to guide roller, roller improve functioning.
    D. cylindrical roller bearing cage with the overall structure, strength greatly increased.
    E. aligning bearing hole diameter tank design, lubrication effect.
    Plain bearings:
    A. roller bearing diameter and length of the rolling elements are small.
    B. cage with rollers or inner guidance.
    C. Cylindrical roller bearing cage using rivet structure, easy to loose, out cover.
    D. aligning bearing no sump hole diameter, lubrication poor results.
2, the choice of materials
    Vibration bearings:
    A. inner and outer rings and rolling bearing steel vacuum degassing, good fatigue resistance.
    B. cage aluminum manganese bronze material, high strength, good elasticity, abrasion resistance better.
    Plain bearings:
    A. inner and outer rings and rolling with common bearing steel.
    B. cage made of zinc brass, low strength, poor flexibility.
3, heat treatment
    Vibration bearings:
    A. inner and outer rings using shell - Ma Ma mixed hardening or quenching and tempering, uniform hardness, internal stress; toughness, shock and vibration.
    B. In the temperature less than 150C when working stability.
    Plain bearings:
    Inner and outer rings using ordinary quenching method, poor toughness, shock and vibration performance is poor, poor thermal stability.
4, tolerances and manufacturing process
    Vibration bearings:
    A. strict accordance with the P6 class precision manufacturing standards, especially in inner diameter tolerance is very small.
    B. ball size ≤ 0.002 Difference
    C. Cylindrical roller diameter of a convexity practice, to avoid stress concentration.
    D. rolling surface ultra-precision processing, smooth finish.
    Plain bearings:
    A. General PO level precision tolerances (part P6 class standard) manufacturing.
    B. rolling grouping ≤ 0.005.
    C. Cylindrical Roller without convexity practice.
    D. Part raceway only for polished finish low.
5, the internal clearance
    Vibration bearings:
    Clearance by mechanical vibration requirements of production, range control in a small range, and good consistency.
    Plain bearings:
    Clearance generally based on the standard group or group C3 production, clearance, or small, or range, discreteness.
6, using the results
    Vibration bearings:
    Low noise, low temperature rise, good stability, long life, no early fatigue.
    Plain bearings:
    Noise, temperature rise, stability is not good, life is short, there is the phenomenon of early fatigue.

Bearing vibration group selection

       With the bearing manufacturing technology has improved continuously, reflecting the dynamic performance of the bearing vibration and noise are increasingly valued by the people. Users of the bearing vibration and noise awareness of the technical characteristics are also increasingly sensitive requirements are also increasing.
     Bearing vibration refers to the geometric center of the bearing part is the instantaneous deviation from an ideal position moves, bearing parts with time-varying elastic deformation, and other rotary motion bearing all the movements necessary, known bearing vibration.
     For a single bearing vibration testing, currently using two units of measurement. One for Acceleration, which is measured in decibels (dB), category code Z1, Z2, Z3; another type of speed, which is measured in microns / second (um / s), group codenamed ZV1 , ZV2, ZV3. These flags bearing vibration group bearing the supplementary code into basic code on the right.
     Bearing vibration and noise are closely related, because the vibration source of the noise, the noise is vibration characterization, so in bearing manufacturing and testing process, through strict control of the bearing vibration value targets, to achieve the purpose of bearing noise control.
     In the choice of bearing vibration constituencies, must be based on the specific use of the bearing conditions. If the host for smooth operation have special requirements, you should choose more appropriate bearing vibration group to meet and achieve the smooth operation of its provisions, such as machine tool spindles. Of the bearing vibration and noise are a requirement, such as cars and aircraft, the same should be used in the corresponding bearing vibration groups in order to achieve the requirements. The noise of the bearing with special requirements, such as electric fans and some other appliances should be used with low noise bearings, in order to meet the requirements.

The main factors affecting bearing vibration

      By the bearing structural design parameters determined by stiffness, flexibility, quality, and damping vibration system constituted under the operating conditions will produce adapt to its mechanical vibrations.
      Manufacturing process of the deviation caused by vibration, the smaller the deviation, vibration is smaller. Surface of the ball roundness, waviness, surface roughness of the bearing part of the most influential factor of vibration, followed by the inner and outer shape of the channel error and surface roughness, cleanliness and again is the bearing lubricant quality.
    Operating conditions, such as installation conditions, speed, direction of the axial load borne by, for money.