The multi-plate clutch consists of a number of clutch plates, instead of only one clutch plate as in the case of single plate clutch. As the number of clutch plates is increased, the frictional contact surfaces also increase. The increased number of friction surfaces obviously increases the torque transmitting capacity of the clutch. The plates are alternately fitted to the engine crankshaft and clutch shaft. They are uniformly pressed by strong coil springs and assembled in a drum. Each of the alternate plates slides in grooves on the flywheel; and the other slides on splines on the pressure plate. Thus, each alteřnate plate has inner and outer splines.
The multi-plate clutches also works in the same way as the single plate clutch, by operating the clutch pedal. The multi-plate clutches are used in heavy commercial vehicles, racing cars and motorcycles for transmitting high torque.
The multi-plate clutches may be dry or wet. When the clutch is used in an oil bath, it is called a wet clutch. When the clutch is operated dry or without any oil, it is called a dry clutch. The wet clutch is generally used in conjunction with, or as a part of the automatic transmission.
You can watch the animation video of Multi-plate Clutches for better understanding:
What is the Need of a Multi-Plate Clutches?
- Where there is a need of high torque output like in pick-up truck, a single plate clutch fails to provide that much frictional force (between flywheel and clutch plates) that is required to provide such high torque, so in a heavy vehicle like pickup trucks multi-plate clutches are used.
- In 2 wheeler vehicles like scooters and bikes there is a problem of mounting due to their small size, Therefore to fulfil the need of required power output, instead of using a large single plate clutch, the multi-plate clutches has a number of small clutch plates is used to transmit torque between the crankshaft and the transmission shaft.
- When there is the engagement of the clutch ( in order to transmit power between the flywheel and the transmission shaft) multiple plates of a multi-plate clutch provides a more frictional force between the flywheel and the pressure plate as compared to single plate clutch, due to which the chances of slip is almost negligible in the multi plate clutches.
- When we go to a rough driving having different ups and downs of road challenges, A multi-plate clutch is necessary to maintain the smooth and steady clutch engagement between the engine and the transmission shaft which in turn continuously provides the required amount of torque and speed to the vehicle.
- The efforts required by the driver on the clutch pedal in order to engage or disengage the clutch is less in the multi-plate clutch as compared to single plate clutch.
|Friction Linings of multi-Plate Clutches|
Types Of Multi-Plate Clutches:
- Spring type multi-Plate Clutches.
- Diaphragm type multi-Plate Clutches.
- Hydraulic type multi-Plate Clutches.