Because of its shape this is described as a diaphragm spring, but in general engineering, it is perhaps better known as a Belleville spring, so named after the French civil engineer Julian Belleville who obtained a British patent for this form of spring as long ago as 1866. Basically, this spring comprises an annular disc initially dished to a conical shape. A compressive load applied to the disc tends to flatten it out, and a spring action is provided as the disc tries to regain its shape. Unlike a coil spring, the compressive load first increases with deflection of the disc and then, as the disc becomes more nearly flat, the load actually decreases with increased deflection, a characteristic unique to this type of spring.
In practice, it means that the load may be held constant over a considerable range of deflections. This is a particularly useful attribute as far as the motor vehicle clutch is concerned since it can be arranged for the clamping force on the Centre plate to be little affected as the liners wear thinner. The fact that this type of spring also possesses a high load carrying capacity for the space required makes it additionally attractive for application to motor vehicle clutches, which consequently can be of correspondingly shallower form.
The diaphragm spring is incorporated in the clutch in a manner which allows it to flex between a pair of fulcrum rings located on the inside face of the clutch cover. To supply the necessary clamping load on the center plate, the outer edge of the diaphragm spring bears against the rim of the pressure plate. The outer edge of the diaphragm spring is also embraced by retraction clips secured to the pressure plate so that the latter can be withdrawn from the center plate when the clutch is disengaged.
The clutch assembly consists of many small parts but the following are the major parts
1. Flywheel – The flywheel, mounted on the crankshaft, keeps on running as long as the engine keeps running. The flywheel is equipped with friction surface OR a friction disc is bolted to the outer side of the flywheel.
2. Friction discs – Single OR multiple (as per requirement) discs lined with friction material having a high coefficient of friction are mounted on the drive shaft.
3. Pressure plate – Another friction disc is fast to the pressure plate. The pressure plate is mounted on the splined hub.
4. Spring levers – The spring used are diaphragm springs that move friction disc back & forth. The spring is backward with the assistance of levers.
How the clutch works
It transmits engine power to the gear case and permits the transmission to be interrupted whereas a gear is chosen to maneuver far from a stationary position, or once gears are modified whereas the automobile is moving.
Hydraulic clutch system
1. Most cars use a clutch operated either by fluid (hydraulic) or, additional ordinarily, by a cable.
2. When an automobile is moving below power, the clutch is engaged. A pressure plate fast to the regulator exerts constant force, by suggests that of a diaphragm spring, on the driven plate.
3. Earlier cars have a series of coil springs at the rear of the pressure plate, rather than a diaphragm spring.
4. The driven (or friction) plate runs on a splined input shaft, through that the ability is transmitted to the gear case. The plate has friction linings, the same as brake linings, on each its faces. this permits the drive to be haunted swimmingly once the clutch is engaged.
5. When the clutch is disengaged (pedal depressed), associate degree arm pushes a unharness bearing against the centre of the diaphragm spring that releases the clamping pressure.
6. The outer a part of the pressure plate, that features a giant friction surface, then not clamps the driven plate to the regulator, therefore the transmission of power is interrupted and gears will be modified.
7. When the treadle is discharged, the bearing is withdrawn and also the diaphragm-spring load once more clamps the driven plate to the regulator to resume the transmission of power.
8. Some cars have a hydraulically operated clutch. Pressure on the treadle within the automobile activates a piston in a very piston chamber that transmits the pressure through a fluid-filled pipe to a slave cylinder mounted on the clutch housing.
9. The slave-cylinder piston is connected to the clutch unharness arm.
For more information regarding spring custom manufactured parts, please call us at 9990044777 or e-mail us at kalyanisprings@gmail.com or visit www.kalyanisprings.com.
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