MEE 1036 – Automotive Chassis By Prof. C.Kannan Assistant Professor (Sr.) SMEC Prof.C.Kannan, SMEC, VIT University
Module 5 – Braking Systems Prof.C.Kannan, SMEC, VIT University Topics to be covered: Stopping Distance, Braking Efficiency, Weight Transfer during Braking, Drum Brakes - Constructional Details, Leading and Trailing Shoe, Braking Torque, Disc Brake - Types and Constructional Details, Relative advantages and disadvantages over Disc Brakes. Hydraulic Braking System, Pneumatic Braking System, Power–Assisted Braking System, Servo Brakes, Retarders, Types and Construction
Energy Conversion during Braking Introduction Prof.C.Kannan, SMEC, VIT University
Mechanism behind Brake Operation Prof.C.Kannan, SMEC, VIT University
Functions of a braking system a) To stop the moving vehicle in a shortest possible distance. b) To help in controlling the speed of the vehicle during cornering . c) To hold the vehicle in stationary position, after it has been brought to stop. d) The brakes should have better anti-fade characteristics Prof.C.Kannan, SMEC, VIT University
Classification of brakes Based on purpose – Service brakes and Parking brakes Based on construction – Drum brakes and Disc brakes Based on method of actuation – Mechanical, Hydraulic, Vacuum, Air Based on location – Wheel, Transmission and Exhaust Based on energy supplied – Manual, Servo/Power assisted, Power Prof.C.Kannan, SMEC, VIT University
Design requirements of a braking system 1. The brakes should stop the vehicle within reasonable distance. The retardation should be smooth and free from jerk. 2. The braking should not be affected by water, heat and dust etc. 3. Pedal effort required by the driver must be optimum so as not to strain the driver. 4. The wear and tear on the material of the brake lining should be minimum for longer life. Prof.C.Kannan, SMEC, VIT University
Design requirements – contd.. • The brake system capable of dissipating heat generated quickly • Should not skid, while applying brakes. • Should have cooling system • Less weight • Less noise and vibration • Easy to adjust having proper maintenance Prof.C.Kannan, SMEC, VIT University
Factors influencing braking force • A vehicle with a 100 hp engine require about 60 sec to accelerate the vehicle from 0 to 100 kmph. If the same vehicle is required to be stopped from 100 kmph to 0 kmph in not more than 6sec then brakes must do the same amount of work as engine did but in one tenth of the time. This means brakes must develop 1000 hp to stop the vehicle. If the weight of the vehicle is doubled then braking force must be doubled. If the speed of the vehicle is doubled then braking force must be four times. If both weight and speed is doubled then braking force must be increased 8 times Prof.C.Kannan, SMEC, VIT University
Capacity of a brake • Unit pressure between the braking surfaces.
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- Summer '19
- Brake, Disc brake, Drum brake, Vehicle braking technologies, VIT University, drum brakes