Warner Electric Wheel-Brakes (Std) - Manual (Page 4)

The electro-mechanical actuating components
comprise a “friction clutch” and serve to generate the
force which multiplied by the cams, presses the brake
shoes into the brake drum. One plate of this “clutch” is
the armature, (Figure 1-2) which is bolted to the drum
and rotates with the wheel. The other plate of this
“clutch” is the magnet, (Figure 1-3) which is mounted
on the brake spider and is free to rotate a limited num-
ber of degrees in either direction. When the “clutch” is
engaged (upon application of an electric current to the
magnet) any movement of the trailer wheel (forward or
backward) causes the magnet to rotate and braking
results.
4 Warner Electric • 800-825-9050 819-0514
Failure to follow these instructions
may result in product damage, equipment damage,
and serious or fatal injury to personnel.
Section l
Description and Operation
The Warner Electric Brake is basically a mechanical
friction brake which uses a simple principle of
electricity for its actuation. The small amount of
electrical current required is obtained from the storage
battery and/or generator with which every towing
vehicle is equipped.
Unlike the ignition system of the engine, the Warner
Electric Brake does not require the use of high tension
current; therefore, no harmful shock is possible.
The main components of the Warner Electric Brake
are the backing plate or brake spider, magnet,
armature, brake band or brake shoes, cams and brake
drum; the nomenclature of the brake components
being dependent on method of fabrication, design,
and to some extent on brake size. With the
electro-mechanical actuating components (magnet
and armature) removed, (Figure 1-1), the brake consists
of a brake spider, which is mounted on the axle flange
and supports the brake shoes and cams. These
components are similar to, and functionally the same
as, those components found in all other mechanical
friction brakes.
Figure 1-1
Electric Brake—Magnet Removed
Figure 1-3
Magnet Assembly
Figure 1-2
Armature Assembly
Brake Spider Brake Shoe
Cams
Dust Cover