Hydrostatic transmission is cooling fan what

The power consumed by the pump is automatically adjusted according to the need for cooling, avoiding the waste of power of the fan, thus balancing the cooling capacity with the heat generated. The main advantages of this system are: the cooling fan can be assembled independently, the speed of the fan can be varied, the driving force of the variable pump is varied according to the need of the fan, the speed of the fan is not limited by the variation of the engine speed, and the consumption of energy is reduced.

3, electro-hydraulic control of the internal gear pump and motor-driven hydrostatic fan system

If the internal gear pump to provide too much flow and pressure, more than the need to drive the motor, part of the hydraulic oil can be through the bypass oil line or pilot pressure control valve flow back to the tank. The pressure controller controls the speed and cooling capacity of the regulating fan. Proportional pressure limiting valves and pilot valves automatically prevent failure, and when the fan controller fails, the fan runs at maximum speed for cooling. The measured temperature controls the amount of current to the electronic valves in the fan system. The main advantages of this system are: very low pulsation, a very smooth operating curve, very little loss of speed at high oil temperatures, and an internal gear motor that eliminates the very high axial and radial forces on the fan.

4, driven by the piston pump and motor electro-hydraulic control of the hydrostatic fan system

Electronic pressure regulator control variable pump drive fan, the whole system pressure and variable pump proportional pressure control valve current proportional to the system pressure valve and the proportional valve current is inversely proportional. In its control range variable pump to maintain a constant system pressure to ensure that the flow into the system is constant. The entire system pressure can be controlled steplessly by the adjustment of the valve current. The measured temperature controls the magnitude of the electronic valve current in the fan system. When the engine speed changes, the piston pump can be automatically adjusted for fan and cooling needs so that the fan speed is always within the required range. When the fan controller fails, the fan operates at maximum drive power. The main advantages of this system are: the fan speed can be varied, the cooling fan can be assembled independently, visualization of some operating parameters, high quality control, no throttling losses, automatic fail-safe device function, and low energy consumption.

In short, the hydrostatic drive fan can be either mechano-hydraulic control or electro-hydraulic control. Mechano-hydraulic control is generally used in simple systems with one or two inputs, while the more complex systems with few inputs generally use electro-hydraulic control systems driven by piston pumps or external gear pumps. As long as the selection can be rationalized according to the needs, the desired cooling effect can be achieved.

2019-03-04

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