saeroadshowii

saeroadshowii内容摘要：

ndy Tubing) is industry standard.  3/16” . is standard size.  Very robust, can take a lot of abuse  Use SAE 45176。 inverted flare (J533 and J512) joints if you can. BRAKE SYSTEMS 101 26 Foundation Brake Subsystem  Disc Brakes  Linings BRAKE SYSTEMS 101 27 Front Disc Brake BRAKE SYSTEMS 101 28 Front Disc Brake BRAKE SYSTEMS 101 29 Brake Linings Brake linings are probably the most misunderstood part of a brake system. The output of any brake is directly related to the coefficient of friction (181。 ) between the lining and the disc or drum. The challenge is knowing what the instantaneous value of 181。 is during any given stop. Any design calculations you do, go right out the window if the lining you use does not have the 181。 value you assumed. BRAKE SYSTEMS 101 30 Brake Linings Remember the equation for a disc brake The best method for determining the actual value of 181。 for a given lining is from a dynamometer test. BRAKE SYSTEMS 101 31 Brake Balance BRAKE SYSTEMS 101 32 Both Front Wheels Locked:  Not good if you are on a curved road  You can’t steer  OK, if you must hit something  The vehicle goes straight BRAKE SYSTEMS 101 33 Both Rear Wheels Locked:  The front wheels track straight ahead  Then the rear wheels deviate to the side  Until the vehicle can’t track straight any longer and the rear starts to spin around the front BRAKE SYSTEMS 101 34 181。 vs. % Wheel Slip 0 10 20 30 40 50 60 70 80 90 100 0 1 % Wheel Slip Mu (Deceleration) Typical Dry Surface Steering Braking BRAKE SYSTEMS 101 35 Front Lock If there is more front brake torque than dynamic front weight The front wheels will lock up before the rears 20% 80% 40% 60% Brake torque distribution Dynamic weight distribution BRAKE SYSTEMS 101 36 Rear。