Suspensions

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Types and properties of suspensions

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Suspensions

  1. 1. Suspensions
  2. 2. Index  Introduction to Suspensions  Struts  Camber  Steering Axis Inclination  What is a MacPherson Strut?  Advantages  Disadvantages  References
  3. 3. Introduction to Suspensions Goal of a Suspension : 1. Comfort 2. Contact 3. Control Components of a Suspension 1. Springs 2. Dampers (Shock Absorber)
  4. 4. SPRINGS COIL SPRING - Consists of a spiral spring - Usually mounted on independent suspensions LEAF SPRING - Consists of metal plates enclosed together - Usually mounted on solid axles
  5. 5. DAMPER (SHOCK ABSORBER) - Basically, damper is a device used to dissipate energy. -Reacts to Velocity -Turning, Braking & Acceleration
  6. 6. STRUTS - Spring & Damper combined together in a single unit results in the formation of a Strut. - Strut is a structural component - Eliminates need of upper control arm - MacPherson Strut is the most commonly used Strut
  7. 7. CAMBER Angle of tyre with vertical axis of car POSITIVE CAMBER - Bottom of tyre inside, Top of tyre outside - Most vehicles use positive camber - Helps in Steering axis inclination NEGATIVE CAMBER - Bottom of tyre outside, Top of tyre inside - Used in racing / off road vehicles - Wider stance - Greater Stability
  8. 8. STEERING AXIS INCLINATION - Positive camber helps to get a smaller scrub radius - Reduced effort at lower speeds - Minimized tyre wear - Wheel goes straight when steering is released
  9. 9. MACPHERSON STRUT - MacPherson strut was developed by Earle .S. MacPherson of General Motors in the year 1949 - It is a combination of a shock absorber (Damper) & a coil spring as a single unit - It is a type of car suspension that uses the axis of the damper as the upper steering pivot
  10. 10. ASSEMBLY OF A MACPHERSON STRUT
  11. 11. ADVANTAGES - Cheaper & lighter than a double A or a double wishbone Suspension - Great for Front Wheel Drive (FWD) cars as it provides space for the driveshaft - Low in Maintainance - Narrower than a double wishbone suspension
  12. 12. DISADVANTAGES - Taller than a double wishbone suspension - As it mounts directly to the body, unibody structure is necessary to handle the stress - It transmits sound and vibrations straight to the body of the car - Smaller camber changes during body roll - No camber gain during Cornering as strut is mounted directly to the body
  13. 13. 3-D ANIMATION OF MACPHERSON STRUT
  14. 14. CARS USING MACPHERSON STRUT Ford Vedette was the first car in which MacPherson Strut was introduced
  15. 15. Mitsubishi Starion was the first car to employ an independent MacPherson Strut assembly for all four wheels
  16. 16. MORDERN CARS EMPLOYING MACPHERSON STRUT SUSPENSION SYSTEMS PORSCHE PANAMERA CADILLAC XTS
  17. 17. REFERENCES Wikipedia ...!!!

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