(1) The operation of wheel brake is as follows:
The primary and secondary shoes are respectively forced by a force equaled in value
and contrary in direction, by operation of the operating cylinder to bring that the friction
piece being in contact with the brake drum. The primary shoe forces the adjuster with the
aid of friction force between the friction piece and the drum. Due to this, the adjuster
pushes the secondary shoe by larger force than that offered by operation of the operating
cylinder. The secondary shoe upper end is forced strongly against the anchor pin,
providing large braking force. See Fig. 2-3.
On the other hand, the braking operation in the truck’s reverse travel is performed in
reverse order, but the braking force is the same as that being in the case of the truck’s
forward travel. See Fig.2-4.
(2) Parking brake
Built in the wheel brake, the parking brake device consists of pull rod and push rod.
Assembled on the side of primary brake shoe by pin, the operation of the pull rod
transmits to the side of secondary brake shoe through the push rod. See Fig2-5.
(3) Clearance self-adjuster
The clearance self-adjuster keeps appropriate clearance between the friction piece
and brake drum. This adjuster, however, actuates only when the truck is braked in reverse
travel. Its structure refers to Fig.2-6.
Fig.2-3 Braking operation Fig.2-4 Braking operation
in forward travel in reverse travel
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