07-10-2016, 12:05 PM
1458195346-VMKR.pptx (Size: 182.66 KB / Downloads: 8)
INDRODUCTION
Today’s technology is in need for speed, also safety as well, for that deceleration is needed engines of max efficiency for maintaining the speed & brakes of latest technology is used.
Brake system are required to stop the vehicle within the smallest possible distance. By converting kinetic energy into heat energy which is dissipated to atmosphere.
MAIN REQUIREMENTS
Brakes must be strong enough to stop the vehicle within the possible distance in an emergency. (safety)
Brakes should have good antifade characteristics also on constant prolonged application its effectiveness should not decrease.
STOPPING DISTANCE OF A VEHICAL DEPENDS
Condition of road surface.
Condition of tyre thread.
Coefficient of friction b/w tyre thread & road surface.
Coefficient of friction b/w brake disc/drum & brake pad.
Braking force applied by the driver.
TYPES OF BRAKES
DISC BRAKE- CONSTRUCTION
COMPARISON b/w CERAMIC DISC BRAKES AND CONVENTIONAL DISC BRAKES
Grey cast iron disc is heavy which reduces acceralation, uses more fuel and has high gyroscopic effect.
Ceramic disc brake weight less than carbon/carbon disc but have same frictional values, used in Formula1 racing cars etc.
CDB good at wet conditions but carbon/ carbon disc fails in wet conditions.
ADVANTAGES
50% lighter than metal disc brakes reduces 20kg of car. In the case of train 36 disc brakes saving amount to 6 tons . Apart from saving fuel also reduce unstrung masses with a further improvement of shock absorber response & behavior.
High frictional values in deceleration process Porsche- 100 to 0 km in 3 sec.
Daewoo’s Nexia- 100 to 0 km in 4 sec.
Brake temperature.
Resistance up to 2000 ْ c .
Still runs after 300000 km need not change CDB.
No wear, maintenance free and heat and rust resistant even under high oxygen concn.
Heavy commercial can be braked safely over long distance without maintenance.
APPLICATIONS
FORMULA1- in mid 90’s French sports car specialist Venturi.
Porsche 911 turbo- with a top speed of 305 km/h and acceleration from rest to 100 km/h in 4.2s. Its engine 3.6 L with 420 hp max torque 560 Nm is still running with PCCB.
911GT2- and Mercedes Benz’s futuristic vision GST is going to reinforce CDB .
DISADVANTAGES
High initial cost and high cost of production.
As the advantages listed above we can hope CDB will work out to be cheaper in the future.
CONCLUSION
CDB due to its advantages over the conventional brake disc are going to be the brake disc for cars in the future. With the success of Porsche turbo car, many other racing cars and commercial vehicles are going to implement CDB in cars.