Roller on Roller Tribometer

Roller on roller with pure sliding to rolling contact stress, block on roller, pin on roller and ball on roller configurations on a single platform.

  1. General Details

    Roller on roller features independently driven twin disc configuration offering rolling-sliding contacts with a wide range of contact pressures.

    The roller on roller set up is widely accepted as a reliable precursor to FZG tests.

    Being modular, multiple contact configurations like block on ring, ball on ring, conformal contacts are also possible, making it a truly multifunctional tribometer that can be used for evaluating materials and lubricants used in rolling element bearings, gears and rail-wheel applications.


    Variable Contact Geometries

    Multifunctional system capable of changing the test configuration from line contact (roller on roller) to area (pin on roller or block on roller) or point (ball on roller) contact. Along with the ease of operation, it helps to achieve high throughput research.

    Roller on Roller - Contact Geometries - Illustration


    UNMATCHED SPEED CONTROL

    The speed of each roller is controlled independently of each other using two servo motors. Therefore, variable slide to roll ratio (0 to 200%) can be achieved by setting different spindle speeds for two rollers. The motion direction can be set to clockwise or counterclockwise to simulate lubricant entrainment and reverse entrainment (starvation) conditions.

     


    FRICTION TORQUE AND LINEAR WEAR SENSORS

    Friction torque is generated during the motion of the rollers in contact. This friction torque is acquired by a torque sensor. Linear displacement of the rollers due to creep and wear is measured using a linear variable differential transducer (LVDT) fixed to the stationary block on the top spindle assembly.

     


    AUTOMATIC LOADING

    The twin disc tribometer comprised of two parallel spindles where each spindle is driven by a variable speed motor, automated loading unit, heating unit, friction torque sensor and linear wear sensor.

    The servo controlled loading system provides a wide range of contact pressures and flexibility of continuous, ramped and custom load profiles.


    Temperature Measurement and Control

    The experiments can be conducted in lubricated or dry conditions. Temperature in the oil cup is managed using embedded heaters and temperature sensors. In the case of dry test conditions, a high temperature module is available as an option for higher temperatures.


     

  2. Technical Info
    • Upper specimen: Roller: 47 mm in diameter, 10 mm wide (flat and crowned roller). Test block: 6.35 x 6.35 x 6.35 mm
    • Lower specimen: Roller: 47 mm in diameter, 10 mm wide (flat roller)
    • Speed: 2 to 2000 rpm
    • Normal load: 0.1 to 8 kN (automatic loading)
    • Temperature: Up to 120 °C (lubricated conditions). Up to 700 °C (dry conditions)
  3. Applications
    • Screening of lubricants for high load power transmission systems at different slip ratios (i.e. gear oils).
    • Investigate the tribological behavior of lubricants and steel interaction up to 120°C.
    • Study the role of material structure in its friction and wear resistance behavior.
    • Rolling contact fatigue behavior of materials used in bearings and railway wheels. Read more about White Etching Layer: A Risk For High Speed Railways and Urban Metros.
    • High-temperature tribology (up to 700°C) of materials used in metal forming.
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