The mechanism for raising and lowering the KamAZ platform includes:
— raising and lowering the platform;
- stop it in any intermediate position during lifting or lowering;
— automatic limitation of the maximum angle of climb;
— automatic pressure limitation in the hydraulic system.
The control of the mechanism for raising and lowering the KamAZ platform is an electro-pneumatic remote control with switches installed on the instrument panel in the cockpit.
Technical characteristics of the KAMAZ lifting mechanism
Dump truck model: Kamaz-55111 / Kamaz-55102
Power take-off - from gearbox through power take-off
Transmitted power (average), W (hp) - 8826 (12) / 8826 (12)
Hydraulic oil pressure kPa (kgf):
— nominal 0.13730 (140) / 13730 (140)
— maximum, limited by safety valve 19613 (200) / 19613 (200)
Working time (lifting a loaded platform) at an engine speed of 2200 rpm, - 18/16
Minimum time (lowering the platform after unloading), s - 18/16
Fuel consumption per 100 operating cycles, l — 5.5 /—
Gear ratio, power take-off. 0.59 / 0.59
The total gear ratio from the engine crankshaft to the driven shaft of the hydraulic pump... 1.26 / 1.26
Pump type - NSh 32-L-2
Pump performance at pump shaft speed 1900. 2000 rpm, l/min - 56/56
Recommended engine speed, rpm - 2200,2500
Number of stages (hydraulic cylinder extension links) - 3/5
Diameter of hydraulic cylinder retractable links, mm:
first - 95, second - 75, third - 56
Effective stroke of hydraulic cylinder sliding links, mm:
first - 1100, second - 1140, third - 1160, total - 3400
Maximum force [oil pressure in the hydraulic system 13730 kPa (140 kgf/cm2)] when stretching joints, kN (tf):
first - 97.1 (9.9) / 217 (22.14)
second - 60.8 (6.2) / 147.8 (15.6)
third - 33.8 (3.45) / 97.1 (9.9)
The KamAZ hydraulic lifting mechanism consists of a power take-off box, an oil pump, a hydraulic cylinder, a control valve, a platform lift limiting valve, electro-pneumatic valves, an oil tank with a filter and a pneumatic-hydraulic drive system.
In addition to these unified components, the platform lifting mechanism of the Kamaz-55102 dump truck has a locking device designed to connect the tractor hydraulics with the trailer hydraulics, and a hydraulic distributor that directs the flow of the truck. Oil in the hydraulic cylinder of a tractor or trailer hydraulic cylinder. The valve is connected to the control valve.
