steering system ppt
Post on 28-Jul-2015
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BY – VISHU SHARMA
KEY INTERFACE BETWEEN DRIVER AND VEHICLE
SET OF MECHANISM USED TO CONTROL THE PATH FOLLOWED BY VEHICLE
ALLOW DRIVER TO GUIDE THE VEHICLE
CONVERTS ROTARY MOTION INTO ANGULAR TURN OF WHEELS
MULTIPLIES EFFORT OF DRIVER
PROVIDES DIRECTIONAL STABILITY
OPTIMIZE TIRE LIFE BY PROPER TIRE TO ROAD CONTACT
HOUSES SAFETY DEVICES LIKE AIRBAGS
ABSORBS PART OF ROAD SHOCKS
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
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
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
CASTER ANGLE
CAMBER ANGLE
STEERING AXIS INCLINATION
TOE
THRUST ANGLE
TURNING RADIUS
SUSPENSION HEIGHT
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
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
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
SYMMETERIC ANGLE B/W WHEELS AND AXIS OF VEHICLE
FUNCTIONS
TOE IN INCREASES
STRAIGHT LINE
STABILITY AT
COST OF TURNING
RESPONSE
GREATER THE TOE
FASTER THE TIRE
WEARS
TOE-IN TOE-OUT
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
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))
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
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
Thank you
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