The main functions of a clutch and engine acyclism
Welcome to the first edition of our series of training articles on the clutch!
The purpose of this quarterly meeting aims to help you quickly identify a problem on a clutch during your daily repairs. You will find the advice that Valeo Service has identified to help you establish a quick diagnosis.
Our 1st article relates to the main functions of the clutch and to engine acyclisme.
THE MAIN FUNCTIONS OF A CLUTCH
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Transmit all the torque. Couple and uncouple the
engine and the gearbox. | Enable the driver to control
the torque to be transmitted. Change gear smoothly. Reduce the vibrations
between the engine and the
gearbox. | All clutches are designed to
slip in the event of excessive
torque in order to protect the
engine and the transmission
. The clutch and the engine
flywheel
must be capable of
dissipating heat. Premature
failures usually result in
clutch slippage. |
ENGINE ACYCLISM: DEFINITION
Internal combustion engines can be characterized by the alternating compression and combustion phases.
The cyclic pressure variations inside the cylinder result in variations in the speed of rotation. These variations are called acyclism.
Acyclism causes an uneven speed of rotation of the crankshaft. This is also called torsional vibration.
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GOOD TO KNOW  Perceived noise can be caused by poor filtration of vibrations and acyclism.
It is the result of the rotation of the crankshaft + engine flywheel + clutch assembly, which is subject to cyclical irregularities.
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