Clutch used in autmobolies consits of clutch plate, pressure plate, fly wheel, thrust bearing etc. Clutch plate construction consists of a steel plate with a splinted central hub and annular friction facings are attached to the steel plate by rivets. Learn more about clutch facing materials to which clutch plate comes in contact when clutch is released. Friction facings are attached to the steel plate using the special resins.
It becomes difficult to control the engagement of the clutch as it is a solid part during clutch operation. Commonly used solution for this is the provision of axial cushioning interposed between the clutch plate and the friction facings. The curved cushioning spring segments are attached rigidly to the centre plate and the friction facings are riveted to these springs. On engagement of clutch, first the load applied has to compress the spring segments to the flat condition, resulting in a greater degree of clutch control and therefore smoother engagement.
Apart from the cushioning, the clutch plates are also provided with means of absorbing tensional vibrations. The clutch plate for this purpose has to be made in two parts i.e., a central hub sub-assembly and the outer facing ring assembly which are torsion ally flexible with respect to each other.
The central sub-assembly consists of a splinted hub with radically placed slots in the flange of the hub. There are similar slots in each of the two plates situated on either side of the hub flange. Coil springs under slings compression are fitted in those slots, those provide a flexible torsion connection between the centre hub flange and the slide plates, which are riveted to the main clutch plate by barrel rivets whose central portions of larger diameter control the relative spacing between the side plates. Clutch plates are usually made perforated to dissipate a large amount as heat which is produced due to friction in clutch.
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