Quantcast Wheel Brake Mechanisms.

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each
other
on
the
brake
drum
diameter
and
each
double-end wheel cylinder assembly is placed between
the toe of one brake shoe and the heel of the other
brake shoe.
Equal
hydraulic
pressure
is
thus
ap-
plied at each end of each shoe. Shoes are always
forward-acting,
independently
actuated
in
the
direc-
tion of drum rotation. Shoes are anchored at either
toe or heel, depending on the rotation of the drum.
(b)
When
the
brakes
are
applied,
the
wheel
cylinder
apply
equal
force
against
the
toe
and
heel
of each shoe. As the shoe linings come into contact
The ro-
with  the  drum,  self-energization  develops.
tation of the drum pulls the shoes against the drum
surface
to
augment
the
hydraulic
force
acting
on
the
shoes
and
produce
additional
braking
action.
(c)
The shoes are of the floating type, each being held
in position by a shoe guide pin, plain washer, C-
washer, and two brake shoe retracting springs. Each
short brake shoe retracting spring is hooked to the
anchor end of the brake shoe and to a projection
on the shoe anchor pin; each long brake shoe retract-
ing spring is hooked to the toe end of the brake shoe
and to a spring pin centered on the spider assembly.
(2) Semitrailers
M270
and
M269
(a) The
wheel
brake
mechanisms
are
located
within
the
TAGO 1321B
27



 


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