A car's clutch pressure plate is a metal disc. Under normal conditions, it is in close contact with the car's clutch plate, rotates with the engine, and transmits power to the gearbox. When the clutch pedal is depressed, the clutch pressure plate separates from the clutch plate, shutting off the engine output and enabling gear shifting. When the clutch pedal is released, the clutch pressure plate and the clutch plate are recombined and power is transferred.
Ⅰ. Types of clutch pressure plates
Clutch pressure plate parts are roughly divided into two types: those with coil springs and those with diaphragm springs. The difference is how the pressure plate is pushed and how it leaves the clutch driven plate.
Ⅱ. Function of clutch pressure plate
By pressing the clutch driven plate against the flywheel with sufficient force, it effectively transfers engine torque and stops the driven plate from rotating when the clutch is released.
Ⅲ. Material of Clutch Pressure Plate
The geometry of the clutch pressure plate is complex and requires good heat transfer, high coefficient of friction and wear resistance. It is therefore usually cast from gray cast iron HT200. The metal structure is a pearlite structure, and the hardness is HB170-227. In addition, a small amount of metal elements (nickel, iron, manganese alloy, etc.) can be added to increase mechanical strength.
Ⅳ. Maintenance of Clutch Pressure Plate Components
1. End face runout inspection of pressure plate
Fix the pressure plate on the mandrel and check the deflection of the end face with a dial gauge. The usage limit is 0.2mm. If the pressure plate riveted contacts are damaged or not riveted, the pressure plate must be replaced.
2. Confirmation of diaphragm spring height
If the diaphragm spring height changes, the diaphragm spring is not elastic enough and should be replaced. The height of the diaphragm spring can be checked with the caliper, and the difference from the standard height must be within 0.5mm.
3. Diaphragm spring small end wear check
Use a caliper to check contact wear marks on the small end of the clutch pressure plate diaphragm spring and the release bearing, and confirm that the depth is 0.6mm or less.