General Description
Structure of parking brake
Brake is located at the front end of output axle of gearbox.
Driven method is pneumatic control. Pneumatic control usually has emergency brake function. When brake
pressure is lower than safe pressure, the system can stop loader automatically.
Working principle of parking brake:
When the loader is driven normally, emergency and parking brake control valve are normally open.
Compressed air from air tank goes through emergency and parking brake control valve, quick release valve,
one part goes into brake chamber to push piston, compressed spring in brake chamber and store energy.
The other part goes into the small chamber of stop valve of variable speed control valve, and connects with
shift gear oilway. When emergency and parking brake are needed, emergency and parking brake valve is
controlled to stop compressed air, brake chamber, compressed air in stop valve chamber will be discharged
into air through quick release valve, shift gear oilway is stopped, gear box is on empty gear automatically, at
the same time spring in brake chamber is released to push piston driven shoe brake in brake chamber to
realize parking brake or emergency brake. When pressure of brake system is lower than safe pressure
(0.3MPa usually), emergency and parking brake control valve will act automatically to realize emergency
brake.
Parking System SPC000022
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