Traction System - Operation-Summary
Powertrax No-Slip Traction System - An Optimal Solution
(courtesy of Powertrax)
No-Slip Traction System is the only differential that offers the
maximum traction performance of a locking differential with the
smoothness of a limited-slip/posi differential. It delivers power
to both wheels through intermeshing teeth in such a way that one
wheel cannot be powered ahead of the other. A specially contoured
saddle ensures direct engagement of the intermeshing teeth. The
No-Slip Traction System features a precision synchronization mechanism
that holds the driver and coupler disengaged throughout a turn,
so the unit remains quiet and operates smoothly. In addition, the
springs mounted in the saddle (that impinge on the pinion cross
shaft) and the turning resistance of the synchronization mechanism
help damp out backlash effects. As a result, the No-Slip Traction
System's operation is virtually unnoticeable to the vehicle driver
until its extreme traction performance is required.
The figure below
illustrates the operation of the precision synchronization mechanism.
In the figure the Powertrax No-Slip Traction System driver disengages
to allow wheel differentiation, the synchro ring rotates with the
coupler and the teeth of the synchro ring travel under the extended
teeth of the driver. The synchro ring continues to rotate with the
coupler until it contacts the spacer paddle. The spacer paddle then
stops the synchro ring, thereby controlling the specific amount
of overlap of the synchro ring teeth relative to the extended teeth
of the driver. The overlap position of the synchro ring prohibits
the driver teeth from reengaging with the coupler teeth. As the
coupler continues to rotate through the turn, the driver is held
disengaged from the coupler and the coupler teeth are able to spin
freely over the driver teeth. This precision operation eliminates
the common ratcheting sounds and harsh characteristics associated
with other locking differentials.
After the vehicle
comes out of the turn, the speed of the two wheels equalize and
a slight rotation of the coupler in the opposite direction carries
the synchro ring out from under the extended teeth of the driver,
thereby allowing the driver and coupler to fully reengage and connect
the two axles together again. The result is maximum traction, full
differentiation, smooth action and quiet operation.
A precision synchronization mechanism controls engagement and keeps
intermeshing teeth disengaged for quiet turns and smooth operation.
in the saddle of the driver help cushion backlash. When the vehicle
is under power, the driveline acts as a large torsion spring. When
power is relieved, the driveline travels backwards moving the cross-shaft
from the front side of the saddle to the back-side of the saddle.
The springs in the saddle slow the cross-shaft travel and cushion
its contact with the saddle, making the operation considerably quieter.
Frictional resistance between the retaining ring (nested within
the synchronization ring) and the coupler also helps damp backlash
effects. When power is relieved while in a turn, or when just transitioning
from drive to coast, the paddle turns the synchronization ring as
the cross shaft moves from the front to the back of the saddle.
The frictional resistance of the retaining rings works to absorb
the elastic energy in the driveline and, together with the saddle
springs, helps eliminate driveline resonance.
No-Slip Traction System offers a superior combination of maximum
traction, smooth and quiet operation, plus easy installation within
the existing differential case. Other differentials require the
entire differential case be replaced and expensive new bearings
press fitted onto the case. Consequently, the ring and pinion gears
that drive the case require exact realignment performed only by
professionally trained driveline mechanics. Conversely, because
the No-Slip Traction System easily installs in the existing case
without disturbing the critical setup of the ring and pinion gears,
even the do-it-yourselfer can install the device, in about an hour,
without any previous experience or special tools. Since it can be
easily installed by the do-it-yourselfer, any mechanic, at any type
of service facility, can also install the Powertrax No-Slip Traction
System. The strength, durability and reliability of the Powertrax
No-Slip Traction System have all been perfected. ZytaniumÔ cross-shafts
are 50% stronger than the originals and are included within every
model. Geometries of the saddle and the intermeshing teeth profiles
have been optimized to maximize both engagement strength and torque
transfer output. An increase of 20% in power transferring teeth
contact was achieved for non-C-Clip models and an increase of over
40% for C-Clip models. All C-clip models maintain tooth continuity
throughout to preserve tooth pattern symmetry and to maximize strength.
The Powertrax No-Slip Traction System incorporates an internal access
slot for effectively installing the C-clip without the need for
teeth elimination that adversely reduces traction output levels.
Overall design results allow the Powertrax No-Slip Traction System
models to withstand over 6,800 ft-lb of torque per axle for very
small differential applications (representing 75% more torque capability
than the axles themselves), to well over 35,000 ft-lb for large
differential applications (representing up to 250% more torque capability
than the axles themselves).