SILENT-TYPE NoSPIN Differential
General Information and Brief Description of Its Construction and Operation
GENERAL INFORMATION
very similar to the regular type NoSPIN Differential
The requirement for a full automatic locking two-
set forth in the forepart of this Manual. The primary
way overrunning clutch or differential, for use in
difference in this device is that it may overrun con-
transfer and drop cases of multi-axle vehicles as well
tinuously until this movement is completed then it
as driving axles of all types of commercial vehicles
automatically returns to full locked engagement,
and passenger cars, has been evident to users of
whereas with the regular NoSPIN during the over-
automotive vehicles for a great many years.
running cycle the clutch teeth of both the driving
Detroit Automotive Products' engineers, in con-
and driven members re-engage after each tooth,
stant search for a simpler and silent means of
causing a slight indexing sound. Positive drive is
preventing individual wheel-spin in driving axles
assured by each type of mechanism when traction is
of light weight vehicles and the elimination of
lost on either side of the device. Both types then
trapped-torques between driving axles, have devel-
remain locked and each side must rotate at ring
oped the silent-type NoSPIN Differential, briefly
gear speed until normal overrunning is required for
described hereunder.
turns or the negotiation of uneven terrain.
The principle on which this device operates is
CONSTRUCTION
The clutch members of the silent-type NoSPIN
The exploded view of a typical silent-type NoSPIN
Differential are held out of engagement while over-
Differential, together with the nomenclature of the
running by the automatic positioning of rotatable
"hold-out" Cam Ring mounted on each Driven Clutch
A-Spider-Center Cam Ass y B-Driven Clutch Members and "Hold-out" Cam Rings C-Spring Retainers D-Springs E-Splined Side Members
FIGURE 11
fixed, the other rotatable. Note the Spider has one
As may be seen in Figure 12, the Spider and Center
long tooth or key on its inside diameter which engages
Cam Assembly of the silent type differential is quite
a slot, of predetermined width, in the Center Cam.
similar to that of the regular NoSPIN except that the
This slot limits the travel of the Center Cam to either
Center Cam has wider cam teeth to carry the two
side of the clutch teeth of the Driven Clutch Member as
sets of cams on each Driven Clutch Member, one
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