Working, Construction And Types of Band Brakes

Band Brakes, types of Band Brakes, Working And Construction of Band Brakes

1. S.B. JAIN INSTITUTE OF TECHNOLOGHY MANAGEMENT & RESEARCH MECHANICAL DEPARTMENT PRESENTED BY:- KHUSHAL A HUDKE GUIDED BY:- SIR. FAISAL HUSSIAN TOPIC:- BAND BRAKES

2. A band brake is a primary or secondary brake, consisting of a band of friction material that tightens concentrically around a cylindrical piece of equipment to either prevent it from rotating or to slow it. BAND BRAKE A band brake consists of a flexible band of leather, one or more ropes, or a steel lined with friction material, which embraces a part of the circumference of the drum.

3. A band brake is also called a simple band brake I n which one end of the band is attached to a fulcrum of the lever while the other end is attached to the lever at a distance b When a force P is applied to the lever at C, the lever turns about the fulcrum O and tightens the band and hence the brakes are applied. . band is wrapped part round a rotating drum. Tension can be applied to the band using a lever.

4. Construction of band brake Band brake is made of rope or belt band which is lined with a friction material . Band is wrapped partially around a drum with its free ends to a lever An external force can be applied to the free ends of this lever for breaking

5. Due to addition of a external force there is a friction between the bands Due to this friction force, the Band is tighten and a tangential force acts on the drum The tightening of the bands creates a tension in the band It stop the wheel connected.

6. Working of band brake When released When the brake band is released, there is no hydraulic pressure applied to the servo and the drum is free to rotate within the band .

7. When applied Hydraulic pressure is applied to the servo that, in turn ,tightens the band around the drum The result is that the drum is locked in a stationary position, causing an output change from the planetary gearset

8. Let T 1 = Tension in the tight side of the band, T 2 = Tension in the slack side of the band, θ = Angle of lap (or embrace) of the band on the drum, µ = Coefficient of friction between the band and the drum, r = Radius of the drum, t = Thickness of the band, and r e = Effective radius of the drum = r + t /2. P.l=T 1 .b for clockwise direction P.l=T 2 .b for anticlockwise direction

9. C lassification of Band Brake Band brake can be classified as Simple band brake Differential band brake

10. Simple Band brake Differential Band brake Fulcrum is at one end of liver Is not self energizing Is not self locking Differential Band brake Fulcrum is betn . two ends of lever Is always self energizing It can be self locking Difference

11. Bibliography http://sounak4u. weebly .com/block-and-band-brake.html https ://www3.nd. edu /~manufact/ FME_pdf_files /FME3_Ch18. pdf

12. Thank you