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Steering system ppt

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brief introduction to automotive steering system, wheel geometry etc

Published in: Engineering
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Steering system ppt

  1. 1. BY – VISHU SHARMA
  2. 2.  KEY INTERFACE BETWEEN DRIVER AND VEHICLE  SET OF MECHANISM USED TO CONTROL THE PATH FOLLOWED BY VEHICLE  ALLOW DRIVER TO GUIDE THE VEHICLE
  3. 3.  CONVERTS ROTARY MOTION INTO ANGULAR TURN OF WHEELS  MULTIPLIES EFFORT OF DRIVER  PROVIDES DIRECTIONAL STABILITY
  4. 4.  OPTIMIZE TIRE LIFE BY PROPER TIRE TO ROAD CONTACT  HOUSES SAFETY DEVICES LIKE AIRBAGS  ABSORBS PART OF ROAD SHOCKS
  5. 5.  RELATIVE NO. OF TURNS OF STEERING WHEEL TO MOVEMENT OF WHEELS  SIZE OF PINION GEAR AND NUMBER OF TEETH ON GEAR DETERMINES STEERING RATIO  EFFECTS RESPONSE OF VEHICLE
  6. 6.  HEAVIER VEHICLES HAVE HIGHER STEERING RATIO  MORE TURNING OF STEERING WHEELS  RESULTS IN LESSER EFFORT  LIGHTER VEHICLES HAVE LOWER STEERING RATIO  LESS NO. OF TURNS  REQUIRES MORE EFFORT TO TURN
  7. 7.  SIZE OF STEERING WHEEL  RELTIVE SIZE OF GEARS IN STEERING GEAR  SIZE AND SHAPE OF STEERING LINKAGES  PERCENT OF VEHICLE WEIGHT PLACED ON FRONT WHEEL  FRONT WHEEL OR REAR WHEEL DRIVE
  8. 8.  CASTER ANGLE  CAMBER ANGLE  STEERING AXIS INCLINATION  TOE  THRUST ANGLE  TURNING RADIUS  SUSPENSION HEIGHT
  9. 9. ANGLE B/W VERTICLE LINE AND KINGPIN CENTRELINE (FROM S.V.) FUNCTIONS  SELF CENTRING ACTION  STRAIGHT LINE STABILITY  EXCESSIVE CASTER MAKES STEERING HEAVIER, LESS RESPONSIVE AND INCREASED EFFORT
  10. 10. INWARD OR OUTWARD TILT OF WHEEL (FROM F.V.) FUNCTIONS  +VE CAMER LOWER STEERING EFFORT  -VE CAMBER IMPROVES GRIP  EXCESSIVE CAMBER CAUSES INCREASED TIRE WEAR, REDUCES STRAIGT LINE ACCLERATION
  11. 11. ANGLE B/W VERTICLE LINE AND KINGPIN CENTRELINE (FROM F.V.) FUNCTIONS  HELPS IN STEERING RETURNABILITY AFTER A TURN IS COMPLETED  REDUCES STEERING EFFORT  REDUCES TIRE WEAR
  12. 12. SYMMETERIC ANGLE B/W WHEELS AND AXIS OFVEHICLE FUNCTIONS  TOE IN INCREASES STRAIGHT LINE STABILITY AT COST OF TURNING RESPONSE  GREATER THE TOE FASTER THE TIRE WEARS
  13. 13. TOE-IN TOE-OUT
  14. 14. ANGLE B/W GEOMETRIC CENTRELINE AND THRUST LINE FUNCTIONS  OCCURS WHEN REAR WHEEL HAS IMPROPER ALIGNMENT  EFFECTS DIRECTION OF TRAVEL BY CAUSING PULL IN THE DIRECTION AWAY FROM THRUST LINE
  15. 15.  The turning circle of a car is the diameter of the circle described by the outside wheels when turning on full lock. There is no hard and fast formula to calculate the turning circle but you can get close by using this Turning circle radius = (track/2) + (wheelbase/ sin(average steer angle))
  16. 16.  SYSTEM AUTOMATICALLY STEERS THE REAR WHEELS ACCORDING TO SPEED OF VEHICLE AND STEERING ANGLE.  USED IN MILITARY, OFF ROAD VEHICLES, BUSES, TRUCKS AND LARGE VAHICLS  INCREASES HANDLING AND STABILITY  REDUCES TURNING RADIUS
  17. 17.  VEHICLE STEERS BY POWER ASSIST FROM EXTERNAL SOURCE OTHER THAN DRIVER’S EFFORT  HELPS IN STEERING OF HEAVY VEHICLES  INCREASES THE STEERING RATIO AND REDUCES DRIVER’S EFFORT  TWO MAJOR TYPES – HPS AND EPS
  18. 18. Thank you

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