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【導(dǎo)讀】SAERoadShowII. MiniBaja. BRAKESYSTEMS101. BRAKESYSTEMS101. 3. TheBasicConcepts. Hydrauliclayouts. Componentfunctions. BrakeBalance. LessonsLearned. TheRules. Questions. BRAKESYSTEMS101. 4. TheBasicConcepts. Kiicenergy=heat. F=ma. BRAKESYSTEMS101. 5. EnergyConversion. BRAKESYSTEMS101. 6. EnergyConversion. At90kph(mph)haskiicenergyof:. OR90,770N-M.BRAKESYSTEMS101. 7. 0. 20,000. 40,000. 60,000. 80,000. 100,000. 120,000. 140,000. 160,000. 180,000. 306090120. Speedkph. E. ne. r. gy. N. -. M. 200kg. 250kg. 290kg. BRAKESYSTEMS101. 8. F=ma. TheKeyQuestion!HowdoyoucalculateF?BRAKESYSTEMS101. 9. BasicSystemModel. BrakeForce. BRAKESYSTEMS101. 10. andwhite”.DiagonalSplit:. Alsocalledcriss-cross.BRAKESYSTEMS101. 11. FrontAxle. RearAxle. PrimarySystem. SecondarySystem. BRAKESYSTEMS101. 12. BRAKESYSTEMS101. 13. Rightfront. leftrear. Leftfront. rightrear. BRAKESYSTEMS101. 14. BRAKESYSTEMS101. 15. FourSub-systems. Actuationsub-system. program)sub-system. BRAKESYSTEMS101. 16. ActuationSub-system. BrakePedal. MasterCylinder. BrakeLines. 16. BRAKESYSTEMS101. 17. TheBrakePedal. DriverInput. 100Nand144mm. BRAKESYSTEMS101. 18. MasterCylinders. OutputPressure. InputForce. insideacylinder. BRAKESYSTEMS101. 19. M/CUnapplied. BRAKESYSTEMS101. 20. M/CApplied. BRAKESYSTEMS101. 21. Operated. Pressurefor. Normal. Secondary. System. Function. BRAKESYSTEMS101. 22. BRAKESYSTEMS101. 23. 02004006008001,000. 0. 200. 400. 600. 800. FrontBrakePressure. Re. ar. B. ra. ke. Pr. ess. ur. e. SplitPoint. Slope. HardStops. therearbrakes. Diagonalsystems. requiretwo. Splitandslopear
【正文】 e race cars have it. ? It looks really cool BRAKE SYSTEMS 101 48 Design to a Specific Objective: ? Do the math first ? Verify your assumptions ? Take the easy solution (KISS) BRAKE SYSTEMS 101 49 Lessons Learned Lesson Number 1 Keep it SIMPLE BRAKE SYSTEMS 101 50 Lessons Learned Lesson Number 2 Keep it light。 but not too light. ? 90% of the braking energy goes into the rotor ? If the rotor is too light it gets very hot ? If the temperatures get too high very nasty things can happen. BRAKE SYSTEMS 101 51 Too light ? 2020 DCAE program involved a Hemi powered Grand Cherokee. ? One team used much smaller rear brakes and rotors to save a few pounds on a 3200 lb vehicle with 500 hp. ? The vehicle went off the end of the main straight at over 100 mph on the third lap because of brake failure. BRAKE SYSTEMS 101 52 BRAKE SYSTEMS 101 53 BRAKE SYSTEMS 101 54 Lessons Learned Lesson Number 3 Packaging and Integration drive 90% of design Lesson Number 4 Read the rules Lesson Number 5 Allow enough time for details and testing BRAKE SYSTEMS 101 55 Brake rules The car must have four wheel brakes operated by a single control. It must have two independent hydraulic circuits with independent fluid reserves. The brake system must be capable of locking all four (4) wheels, and stopping the vehicle in a straight line The braking systems must be protected with scatter shields from failure of the drive train (FSAE only) A brake pedal overtravel switch must be installed. This switch must kill the ignition and cut the power to any electrical fuel pumps. (FSAE only) The car must be equipped with a red brake light that illuminates when ever the brakes are applied BRAKE SYSTEMS 101 56 Any Questions
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