Author: haroonkhan

Centrifugal clutch works on the principle of centrifugal force. When driving shaft rotates at high speed, the shoes move radially outward. The outer surfaces of the shoes are covered with friction material which engages the pulley. Thus, pulley rotates with driving shaft. The engagement of shoes with pulley is shown in Figure 16.7. This type of clutch…

In cone clutch, the friction surfaces make a cone of an angle 2β (Figure 16.6). The normal force on the cone is  where β is semi-cone angle. The main advantage of cone clutch is that the normal force is increased, since sin β ≤ 1. Figure 16.6 Cone Clutch Torque for Uniform Pressure Torque for Uniform Wear Example 16.4: A cone clutch having…

The function of multi-disc clutch is similar to the single plate clutch but number of discs in multi-disc clutch is more than one, i.e., ‘n’ as shown in Figure 16.5. Figure 16.5 Multi-disc Clutch Torque for Uniform Pressure Torque for Uniform Wear Example 16.3: A multi-disc clutch has four discs on the driving shaft and three discs on…

In a single plate clutch, a flywheel ‘A’ is bolted to a flange on the driving shaft B. The friction plate C is fixed to a hub which can slide on the spline, i.e., driven shaft ‘D’. Two rings of friction material are riveted to flange ‘A’ and the plate ‘C’. The pressure plate ‘E’…

Clutch is a device which is used to engage and disengage the driven shaft from driving shaft during the motion to change the gears meshing without stopping the driving shaft. Its operation is based on the friction between two surfaces; friction torque is applied by driving shaft on driven shaft. Clutch may be classified as…

To accommodate misalignment between mating shafts for more than the 3°, a universal joint is used. Angular misalignments of up to 45° are possible at low rotational speeds with single universal joints. It consists of two yokes, a centre bearing block, and two pins that pass through the block at right angles. Approximately 20° –…

In a rigid coupling, the torque is transmitted from one half of the coupling to the other through the bolts and in this arrangement shafts need be aligned very well. However, in the bushed coupling the rubber bushings over the pins (bolts) (as shown in Figure 16.2) provide, flexibility and can accommodate, some misalignment. Because of…

Rigid couplings are designed to draw two shafts together tightly so that no relative motion can occur between them. This design is used for some special kinds of equipment in which precise alignment of two shafts is required. In such cases, the coupling must be capable of transmitting the torque in the shafts. Rigid couplings…

The term coupling is a device used to connect two shafts together at their ends for transmitting the power. There are a number of coupling devices used to couple two shafts but in this chapter only few important couplings have been introduced for understanding of the students. There are two general types of couplings: