Limited Slip Differential - PowerPoint by swenthomasovelil

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									LIMITED SLIP DIFFERENTIAL
              Introduction
   What is a Differential?
   A differential is a device that splits
    the engine torque in two ways,
    allowing each output to spin at a
    different speed.
   Facilitates the driven wheels to
    rotate at the same speed while on a
    straight road.
   Allows the outer wheel to rotate
    faster than the inner wheel, while
    taking a curve or traveling on an
    uneven surface.
           Main Functions

   To aim the engine power at the
    wheels.
   To act as the final gear reduction in
    the vehicle, slowing the rotational
    speed of the transmission one final
    time before it hits the wheels.
   To transmit the power to the wheels
    while allowing them to rotate at
    different speeds.
       Need For Differential

   Driven wheels demand different
    RPM’s at different situations.
   A great deal of force is required
    to make a tire slip, while
    cornering a curve.
   Heavy strain on the axle
    components.
Open Differential
           Disadvantage

   Always applies the same
    amount of torque to each wheel.
   Slipping of wheels having less
    traction.
   Not suitable for off-road driving
Limited Slip Differential (LSD)

   It rules out the disadvantages of an
    open differential.
   Uses various mechanisms to allow
    normal differential action when going
    around turns.
   When a wheel slips, they allow more
    torque to be transferred to the non-
    slipping wheel.
   Reduces Slipping of wheels to a
    great extent.
           Classification

   Three main types of LSD’s:

         1) Clutch type
         2) Viscous Coupling
         3) Worm & Wheel LSD
           Clutch Type LSD

   Main Components
    same as that of an
    open differential.
   It adds a Spring
    Pack and a set of
    Clutches.
   Spring pack along
    with the clutches
    provides a
    Preload.
Constructional Details
                Working

   Both side
    gears spin
    with the cage
    during normal
    operation.
   If one wheel
    wants to spin
    faster than the
    other, it must
    first overpower
    the clutch.
         Viscous Coupling


   No gear train involved.
   Power is transferred through
    highly viscous fluid.
   Used in All Wheel Drive (AWD)
    vehicles.
        Worm & Wheel LSD


   Most efficient among all the LSDs.
   Worm and worm gears replaces the
    pinions and side gears in an open
    differential.
   It works on the principle that “a worm
    gear can turn a worm wheel, but the
    worm wheel is not capable of turning
    the worm gear”.
Working
                  Working

   As the carrier is
    turned by the ring
    gear, it forces the
    worm wheels to
    rotate with it.
   Because the wheel
    is unable to turn
    the worm gear, this
    transfers power to
    axle shaft.
                   Working

   In a corner when
    differential action
    is required the
    inside axle slows,
    slowing the worm
    gear to which it is
    attached.
   This in turn twists
    the worm wheels
    in which it is
    contact.
                  Working

   As these worm
    wheels twist they
    turn the spur gear.
   This spur gear
    turns the spur gear
    of the second
    worm wheel, which
    is in contact with
    the worm gear of
    the outer wheel
    shaft.
Questions……???

								
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