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2015 aug 14 Automotive Brakes

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Compiled the evolution and few basics. The history of development is also included.

Publié dans : Industrie automobile

2015 aug 14 Automotive Brakes

  1. 1. H R A M A S U B R A M A N I A N ( H R S ) An awareness
  2. 2. EVOLUTION OF AUTOMOTIVE BRAKES Started with solid wheels No brakes. Only the bullock is controlled to slow down or stop the cart. Horse drawn cart. Faster than bullock carts. 2 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  3. 3. EVOLUTION OF AUTOMOTIVE BRAKES Since the speed is more, it was difficult to slow down or stop the cart within the distance. They realised the need for an external force to slow down or stop the cart. They designed a wooden block and a lever as a brake for the cart. The wooden block wear was more and required to replace very often. The metal ring gave comparatively uniform friction than simple wooden wheels. 3 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  4. 4. EVOLUTION OF AUTOMOTIVE BRAKES As you know, you need more contact area of friction to reduce the wear. Instead of holding the wheel periphery, holding a drum is simpler. They designed a metal band and a lever as a brake for the cart. Friction materials were developed and pasted inside the band to make brakes more effective. Instead of single band, hinged two piece bands were developed, next. 4 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  5. 5. EVOLUTION OF AUTOMOTIVE BRAKES These technology were used for quite some time. Even today, bullock carts are used without brake which you can see, in Chennai itself. Instead of wooden wheels, tyres are used today. That makes the bullock’s life easier. If it is two wheeled cart, the load on the bullock / horse is more. With four wheels, more load can be pulled. 5 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  6. 6. WHY DO YOU NEED BRAKES? Newton’s law of motion First Law: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. Second Law: The relationship between an object’s mass m, its acceleration a, and the applied force F is F=ma Third Law: For every action there is an equal and opposite reaction. 6 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  7. 7. WHAT HAPPENS WHEN YOU APPLY BRAKES? The simple answer: They slow you down or stop The complex answer: The common misconception is that brakes squeeze against the drum or disc, the pressure of squeezing action is what slows you down. This, in fact, is only part of the equation. Brakes are essentially a mechanism to change the energy types. When you are travelling at speed, your vehicle has kinetic energy. When you apply the brakes, the pads or shoes that press against the rotor or drum convert that energy into thermal energy through friction. The cooling of brakes dissipates the heat and the vehicle slows down. First law of thermodynamics or law of conservation of energy. 7 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  8. 8. BRAKING SYSTEM 8 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  9. 9. BASICS OF BRAKE SELECTION 9 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  10. 10. Static Front Axle weight (FAW) Static Rear axle weight (RAW) Gross Vehicle weight (W) Height of CG (h) Wheel Base (L) Brake applied at ‘a’ deceleration Weight transfer from rear to front =(W x a x h)/L Dynamic Front Axle weight FAW + W.a.h/L Dynamic Rear Axle weight RAW – W.a.h/L 10 DYNAMIC WEIGHT TRANSFER Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  11. 11. TYPES OF BRAKING SYSTEM 11 Cable Operated Solid Bar Operated Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  12. 12. TYPES OF BRAKING SYSTEM 12 Single Circuit Hydraulic Dual Circuit Hydraulic Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  13. 13. MECHANICAL ADVANTAGE – HYDRAULIC SYSTEM 13 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  14. 14. BRAKING SYSTEM 14 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  15. 15. TYPES OF BRAKES & THEIR FUNCTION Drum Brake 15 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  16. 16. TYPES OF BRAKES & THEIR FUNCTION Drum Brake 16 Single Leading Forward Rotation Reverse Rotation Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  17. 17. TYPES OF BRAKES & THEIR FUNCTION Drum Brake 17 Double Leading Forward Rotation Reverse Rotation Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  18. 18. TYPES OF BRAKES & THEIR FUNCTION Drum Brake 18 Double Leading Forward Rotation Reverse Rotation Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  19. 19. TYPES OF BRAKES & THEIR FUNCTION Drum Brake 19 Duo Servo Forward Rotation Reverse Rotation Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  20. 20. TYPES OF BRAKES Disc Brake 20 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  21. 21. TYPES OF BRAKES Disc Brake 21 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  22. 22. WHY DISC BRAKE? Brakes are generally Speed Sensitive Load Sensitive Temperature Sensitive Compared to drum brakes, disc brakes are, Less speed sensitive Less temperature sensitive Less load sensitive. Consistent performance even at high temperature and speed Drum brake – curved Mu Disc brake – flat Mu Positive clamping Faster response Self adjusting Self cleaning Minimal regular maintenance Easier lining change 22 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  23. 23. HOW DISC BRAKE WORKS? When brake is applied, the hydraulic pressure from the master cylinder pushed the piston, thus moving the pad against the rotor. Once the pad is pressed against the rotor, the reaction force acts on the caliper body and slides in the opposite direction moving the fist. Thus the pad on the other side of the rotor is pressed against the rotor. Thus a clamp force is generated the rotor is slowed down or stopped from rotation. 23 When the brake is released, the pressure is released. The reaction force becomes zero and the pads move away from the rotor leaving an air gap. Thus the rotor starts rotating again. Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  24. 24. REQUIREMENTS Safety Critical Parts of an Automobile Tyre Steering Brakes o Reliability o Consistency o Directional Stability o Heat Dissipation o Fade Resistance o Less Weight o Serviceability o Longer Life 24 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  25. 25. HISTORY OF DEVELOPMENT 25 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  26. 26. HISTORY OF DEVELOPMENT 26 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  27. 27. HISTORY OF DEVELOPMENT 27 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  28. 28. HISTORY OF DEVELOPMENT 28 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  29. 29. HISTORY OF DEVELOPMENT 29 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  30. 30. HISTORY OF DEVELOPMENT 30 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  31. 31. HISTORY OF DEVELOPMENT 31 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  32. 32. HISTORY OF DEVELOPMENT 32 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  33. 33. HISTORY OF DEVELOPMENT 33 Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of
  34. 34. HISTORY OF DEVELOPMENT 34 END Automotive Brakes & Braking Systems The information is a collection from Internet. This presentation is the copy right of

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