torsin is a trademark of the jtecht
corporation
the torsion differential has many
patented components and is the most
unique and ingenious method of providing
differential action while overcoming the
traction difference problem
the internal components of a torso are
quite different from that of a
conventional differential
at the heart of the system lies a
specially shaped gear pair assembly
let's see the cross-sectional shape of
these gears at the mating point
as can be seen one gear is a spur gear
and the other one is a worm gear
a torson works on the simple principle
of worm gear worm wheel
that is a spinning worm gear can rotate
the wheel
but the rotating wheel cannot spin the
worm gear
throughout this discussion just keep
this principle in mind
a pair of such worm wheels are fitted
with the
case so the engine power received by the
case is transferred to the worm wheels
each end of the wheels is fitted with a
spur gear
now let's consider different driving
scenarios
when the vehicle moves straight
the worm wheels will push and turn the
worm gears
so both the drive wheels will rotate at
the same speed
please note here that in this condition
the worm wheels do not spin on its own
axis
in this condition the whole mechanism
moves as a single solid unit
when the vehicle is negotiating a right
turn the left wheel needs to rotate at a
higher speed than the right wheel
this speed differential is perfectly
supported in the torsion
the worm gear of the faster left axle
will make the corresponding worm wheel
spin on its own axis
on the other side
relative to the case the slow right axle
is turning in the opposite direction
thus the right worm wheel will spin in
the opposite direction
the meshing spur gears at the ends of
the worm wheel will make sure that the
worm wheels are spinning at the same
speed
thus it guarantees a perfect
differential action
now let's try to understand how the
torsion overcomes the drive wheel
traction difference problem
as you might be aware when your vehicle
encounters a situation as shown the
slippery wheel starts to spin very
rapidly and will draw the majority of
the engine's power
as a result the vehicle will get stuck
but if a torsion differential is used in
this case as soon as the slippery wheel
starts to spin excessively the speed
change will be transferred to the worm
wheel
the right worm wheel transfers the speed
change to the left worm wheel since they
are connected through spur gears
here comes the tricky part
the left side worm wheel will not be
able to turn the corresponding worm gear
because as we said a worm wheel cannot
drive a worm gear
as a result the whole mechanism gets
locked and the left and right wheels
turn together this allows a large amount
of torque to be transferred to the high
traction wheel and the vehicle can
thereby overcome the traction difference
problem
to carry the load two more worm wheel
pairs are added
if you are familiar with the other
common technologies used to overcome the
traction difference problem you might
have noticed a great advantage of the
torsion
while the other technologies allow the
drive wheel to slip for a limited amount
of time before it gets locked in torsion
the locking action is instantaneous
that means as soon as the vehicle
encounters a traction difference track
the wheels will get locked
to know more about the clutch pack lsd
technology please check the next video
thank you