AMIT KUMAR ROLL NO.-07-ME-404 Introduction BRAKING SYSTEM.

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Presentation transcript:

AMIT KUMAR ROLL NO.-07-ME-404

Introduction

BRAKING SYSTEM

TYPES OF BRAKES  HYDRAULIC BRAKES  VACUUM-ASSISTED BRAKES  AIR PRESSURE ASSISTED BRAKES  AIR PRESSURE BRAKES  MECHANICAL BRAKES  HYDRAULIC DISC BRAKES

HYDRAULIC BRAKE

PRINCIPLE OF HYDRAULIC BRAKE PASCAL'S LAW Pascal's law states that if the pressure is applied at any point in an incompressible liquid it is transmitted undiminished to all other parts in the liquid. In the figure the piston covers a fluid of density r and the atmospheric pressure over the piston is P 0. Then pressure at height ‘h’ below. P = P 0 + h g …. (i) Now if the outside pressure is increased by DP, then P’ = P 0 + P + h g ….(ii) This implies that increase of pressure at top reaches undiminished every where.

LAY OUT OF HYDRAULIC BRAKE

PASCAL LAW (i) Hydraulic press: p = f/a = F/A or F = A/a × f This can be used to lift a heavy load placed on the platform of larger piston or to press the things placed between the piston and the heavy platform. ii) Hydraulic Brake: Hydraulic brake system is used in auto-mobiles to retard the motion. The principle of hydraulic brake is same as that of the hydraulic lift.

PARTS OF HYDRAULIC BRAKE  BRAKE PEDAL  PUSH ROD  MASTER CYLINDER  WHEEL CYLINDER

WORKING OF HYDRAULIC BRAKE INLET PORT COMPENSATING PORT CHECK VALVE MASTER CYLINDER BRAKE ON WHEN THE DRIVER DEPRESSES THE BRAKE PEDAL, THE MASTER PISTON MOVES FORWARD CUTTING OFF THE FLUID SUPPLY FROM THE RESERVOIR. HYDRAULIC PRESSURE MOVES THE PISTONS OF THE WHEEL CYLENDER

WORKING OF HYDRAULIC BRAKE BRAKE OFF. THE RETURNING FLUID FORCES THE MASTER CYLINDER PISTON BACK UNTIL THE RESERVOIR PORT IS UNCOVERED. THE SPRING IN THE WHEEL CYLINDER KEEPS THE BRAKE SEALS IN POSITION NEXT TO THE PISTONS.

BRAKE RELEASED WHEN THE DRIVER RELEASES THE PEDAL, THE RETURNING FLUID OPENS THE CHECK VALVE AND SLOWLY RE-ENTERS THE MASTER- CYLINDER.A SPRING CLOSES THE VALVE TO LEAVE A SLIGHT PRESSURE IN THE LINE WORKING OF HYDRAULIC BRAKE

Hydraulic Brake Control Valves Brake hydraulic systems need various type of control devices Braking performance must be even and consistent Combination disc/drum systems require different type of valves

Advantages of the Hydraulic Brake :