Category: Coupling, Clutch, And Brake

This is combination of band and block brake. A number of blocks are mounted on the drum and inside the band and brake is applied by pressing the blocks against the drum with the help of band. To increase the effectiveness of brake, blocks are used under the band since blocks have higher coefficient of…

Band brake consists of a band in the form of belt, rope, or steel band (Figure 16.9). When force is applied at the free end of lever, the brand is pressed against the external surface of the drum. Figure 16.9 Band Brake Braking torque,   T = (T1 − T2) × r   But where T1 is tension in tight side and T2 is tension in…

In this brake, a shoe or block is pressed against the drum. The force can be increased by using a lever as shown in Figure 16.8. The brake lining for friction is made of softer materials so that it can be replaced easily after wearing. Figure 16.8 Block or Shoe Brakes Let r = Radius of drum   μ = Coefficient of…

Brake is a device which is used to bring the body into rest while it is in motion or to hold a body in a state of rest by applying resisting force. There are four types of brakes as given below:

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° –…