Clutches

This blogs about a clutch that was done in practical.

The clutch is used to transmit engine drive (torque) to  the transmission which drives wheels in a motor vehicle. Motor vehicles using a manual transmissions use a dry single plate clutch which MUST NOT have any oil or grease because this would cause slipping of the clutch friction face against the pressure plate.
A clutch is bolted to the flywheel and splined with the input shaft which rotates with engine due to torque from engine but doesn't turn when clutch is engaged. A clutch is normally located in around the same area as if it were in a in line (north to south) or transaxle (east to west) assembly. A clutch disk is sometimes referred  to as a friction disc. The friction material are riveted to the disk which provide a lining against contact surfaces of flywheel (engine side) and pressure plate (transmission side), while the grooves between each friction face aids in cooling and clutch release. The torsion spring also known as damper spring are there to help absorb shock of selecting gears and also help stop vibration from engine transmitting into transmission.When clutch is engaged the clutch plate is squeezed between the flywheel and pressure plate and when disengaged the release bearing pushes ( by way of fork) onto diaphragm spring which then distorts and pulls back the pressure plate away from the clutch plate which allows flywheel and clutch plate to free spin and gear selection. The friction material will wear after a while and become thinner because the diaphragh spring is natural cone shape it will move closer to flywheel which means these two component's will slip which creates excessive heat that will destroy clutch assembly . For this the release bearing would need to be moved back so there would clearance between the two. To achieve this with out taking the transmission off or putting pressure on release bearing while engaged is by adjusting the clutch rod or cable linkage which can be made by a threading link at the clutch lever or cable mounting on firewall. Clutch adjustments are made to compensate for wear like stated before and linkage between clutch pedal release lever (fork) which means setting the right amount of free play in the release mechanism. Too much play equals clutch to drag while in disengagement and too little play equals cause clutch slippage. In a hydraulic clutch, as pedal depresses and rods contact the master cylinder pistons which then contact with assembly value and closes the inlet value allowing hydraulic pressure to build in the master cylinder which then transmits to slave cylinder and then fork starts pushing on bearings which compress the diaphragm spring