5-10t Internal Combustion Counterbalance Forklift Truck Operation & Maintenance Manual
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5.4.2 Wheel Brake (For 8-10t Trucks) (Refer to Fig 5-9.)
Clamping brake is used as the wheel brake for 8-10t forklift trucks. The brake disc is fixed on wheel
hub using screws, as the rotating component. The brake calipers are symmetrically installed on the
outer edge of brake disc, and the brake calipers are composed of inner caliper housing and outer
caliper housing, with inner and outer caliper housings fixed into a whole using bolts, after being
assembled together, to form the brake block. The brake block is suspended and installed on the
caliper housing through guide pin and is able to make axial movement along the guide pin. The inner
and outer caliper housings on the two sides are actually a hydraulic brake wheel cylinder block,
respectively, wherein one piston is mounted, respectively, and rectangular section rubber seal rings
are fitted on the wall of brake wheel cylinders. The inner cavities of the two cylinders are joined
using the oil pipe located outside the housing. Spring is fitted inside the cavity of piston, as a
mechanism for automatic return and automatic compensation for wear of friction plate. The fixed pin
shaft is screwed down on the caliper housing, and the friction snap ring is mounted on the pin shaft
with certain frictional force. One end of return spring is supported on the outer flange of sleeve,
while the other end is pressed on the cover plate, and the cover plate is retained using retainer ring.
The sleeve is limited using friction snap ring. During brake, the piston moves under the hydraulic
action, the retainer ring on the piston actuates the cover plate to compress the return spring. The
piston pushes the brake block, to bear down on the brake disc, for brake moment to be generated.
When pressure of brake fluid is eliminated, the piston recovers to its original position under the
tension effect of return spring.
After the friction lining is worn out, the displacement of piston during brake is increased, and when
the displacement of piston is larger than the clearance between the retainer ring and the sleeve flange,
the movement of piston will allow the retainer ring to bear down on the sleeve flange, to force the
sleeve to overcome the frictional force between the friction snap ring and the fixed pin shaft, to move
together with piston. The travel of the friction snap ring relative to the fixed pin shaft is namely the
wear of the lining. After the pressure of brake fluid is eliminated, under the action of return spring,
the piston will still move back for a certain distance, the friction snap ring will stop at a new position,
thus for the clearance of brake to always maintain a normal value, and as a consequence, to achieve
the target for automatic reset of piston and compensation for wear of lining.
Summary of Contents for FD100T
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