Clutch and How Does it Work?

A clutch is a device that is used to connect a driving shaft to a driven shaft, and to stop or start the driven shaft without stopping the driving shaft. In other words, it can engage and disengage power transmission.

For an example, the most common application of clutches we see is in automobiles. In order to change gear, it required to stop the driven shaft without stopping the driving shaft. So, this is done by connecting a lever to the clutch, so we can contact and disconnect clutch as we wish. Even after we change the gears, we need to let the driving shaft to rotate the driven shaft. When we want to stop a vehicle, it’s the same procedure.

Characteristics of materials which can be used for lining of friction surfaces of a clutch

  • Relatively high and uniform coefficient of friction under entire operating conditions.
  • Ability to withstand moistures and oils.
  • Ability to withstand high temperatures caused by slippage.
  • Better to be a heat conductive material.
  • Ability absorbs relatively high energies for short periods.
  • Ability to withstand high pressure plate compressive loads.
  • Ability to withstand with high resistance to wear and scoring.
  • Ability to withstand high impacts of centrifugal force during gear changing. (/) Adequate shear strength to transmit engine torque.
  • High level of endurance in cyclic working without effecting friction properties.
  • Good compatibility with cast iron facings over the entire range of operating temperature.
  • A high degree of tolerance against interface contamination without affecting its friction take-up and grip characteristics.
Harry Williams
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