Automobile clutch plate manufacturing
Generally speaking, in a manually operated car, there are three pedals, brake, accelerator and clutch. The clutch plate (Figure 1) helps overcome inertia and start the vehicle. When a car's engine produces power, that power is transmitted from the engine crankshaft to the drive wheels as twisting force (torque) through the clutch. Using a clutch friction device to engage and disconnect power flow (Figure 2) allows for smooth, progressive power and torque transfer. Clutches are useful in equipment with two rotating shafts.
In a car, you need a clutch because the engine is spinning all the time, but the wheels don't turn when the car is stationary. The wheels can only turn through gears. But if you don't use the clutch and use gears to turn the wheels, the engine will stop. Because the engine is not designed to directly turn the wheels when the car is stationary, the clutch will gently engage between the drive wheels and the engine crankshaft and start the drive wheels. sports.
The clutch allows the engine to smoothly engage the non-rotating transmission by controlling slippage between the engine and transmission (Figure 2). The clutch's default state is engaged, which means the connection between the engine and transmission is always "on" unless the driver depresses the clutch pedal and disengages it. If the engine is run with the clutch engaged and the transmission in neutral, the engine will rotate the transmission's input shaft but will not transfer power to the wheels.
Clutch linings are made from an NBR formula, which contains a combination of ingredients that basically function like a brake pad. The clutch lining is the clutch's gripping surface. The clutch lining is a friction material similar to the rubber brake lining, so the friction is smooth and the noise is less during use. However, their function is quite different from that of brake pads because, unlike brakes, clutches are used to transfer the motion of one mechanical part to another by keeping the two surfaces in contact. Clutch linings prevent these two surfaces from slipping.
Today's clutch linings are usually made from fiberglass, Kevlar textile, some kind of metal (copper, steel, etc.), reinforced carbon, graphite, silicate, etc., bonded with an oil-resistant elastomer (preferably NBR) .
However, for most of the 20th century, clutch linings were made from asbestos, which has better cushioning properties and wear resistance than the modern materials used today.
Because asbestos produces toxic gases during use, developed countries have restricted its use.
Figure 3: Typical clutch components
A clutch is a mechanical device used to engage and disengage power transmission, specifically from a driving shaft to a driven shaft (Figure 2). Clutches are used when the amount or timing of power or motion transmission must be controlled.
The clutch is a subcomponent of a car's manual transmission system that engages and disengages the engine from the transmission and transmits torque to the vehicle's transmission instantaneously. The clutch is a metal disc that, along with the pressure plate and flywheel, directs the flow of power between the engine and transmission.
The various components required to provide power to the drive wheels include the flywheel, pressure plate, clutch plates, release bearings, control linkage and transmission. Modern clutches have four main components: the cover plate (containing the diaphragm spring), the pressure plate, the driven plate, and the release bearing.
Figure 4: Function of the diaphragm spring
The cover plate is bolted to the flywheel, and the pressure plate exerts pressure on the driven plate via a diaphragm spring or, as on early cars, a coil spring. The driven disc runs on a splined shaft between the pressure plate and the flywheel. Both sides of the driven plate are coated with friction material. When fully engaged, the friction material grabs the pressure plate and flywheel. When the clutch pedal is partially depressed, the friction material slides a certain amount, allowing the driving force to rise smoothly.
When the car is driven under power, the clutch is engaged. A pressure plate bolted to the flywheel exerts a constant force on the driven plate via a diaphragm spring (Figure 4). Early cars had a series of coil springs behind the pressure plate instead of diaphragm springs.
The driven disc (or friction disc) runs on a splined input shaft through which power is transmitted to the transmission.
Both sides of the plate have friction linings similar to brake pads, which allow the drive to be smoothly taken up when the clutch is engaged.
When the clutch is disengaged (the pedal is depressed), an arm pushes the release bearing toward the center of the diaphragm spring, releasing the clamping pressure. The outside of the pressure plate has a larger friction surface that no longer clamps the driven plate to the flywheel, so power transmission is interrupted and gear changes can be made.
When the clutch pedal is released, the thrust bearing retracts and the diaphragm spring load clamps the driven disc to the flywheel again to resume power transmission.
Some cars have hydraulic clutches. Pressure on the clutch pedal in your car activates a piston in the master cylinder, which transmits the pressure through a fluid-filled pipe to a slave cylinder mounted in the clutch housing. The slave cylinder piston is connected to the clutch release arm.