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gearbox & axle assembly.
The service brake is made up of two brake shoe, sub cylinder and adjuster.
The brake shoe, one end of it being connected to the anchor pin and the other to the
adjuster, is stressed on backing plate by the spring and spring pull rod.
In addition, a parking brake and a clearance self-adjusting mechanism are fitted on
the service brake. (See Fig. 2-8, 2-9, 2-10)
(1) Braking operation
The primary and secondary shoes are respectively forced by a force equal in value
by master cylinder until the upper end of the secondary shoe is against the anchor pin and
the brake shoe moves towards the rotation direction of the brake drum.
The friction force between the friction piece and brake drum increases when the
anchor pin is laid against. A large braking force is produced because the secondary brake
shoe bears a larger force from the primary shoe than from the sub cylinder. (See Fig. 2-3)
The operation of the brake is opposite from forward travelling when travelling
backward. (See Fig. 2-4)
Fig. 2-3 Braking operation in forward travel Fig. 2-4 Braking operation in backward travel
(2) Parking brake
The parking brake is built in the service brake which is made up of push rod and pull
rod.
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