Rexroth A4VG180 Piston Pump Variable Displacement
The Rexroth A4VG180 is a high displacement axial piston variable displacement pump with mature technology, excellent performance, and wide application. The key to its success lies in excellent engineering design, high reliability, and rich control functions, making it the preferred "heart" component for many heavy-duty hydraulic systems.
Model meaning analysis: A4VG180
A4V: Series code for Rexroth axial piston variable displacement pump. The A4V series is a tilting disc variable displacement pump known for its compact structure and high power density.
G: Usually represents the "through axis drive" version. This means that the rear end of the pump can be connected in series with a gear pump or other type of auxiliary pump (such as the A4VG series auxiliary pump) to provide pilot control oil or other functions for the system, thereby improving space utilization and system integration.
180: represents the displacement of the pump, measured in milliliters per revolution. The main shaft of the pump theoretically discharges 180 milliliters of hydraulic oil for every rotation. This is a large displacement pump, which means it can provide enormous flow at medium to high pressures, making it suitable for high-power systems.
Main structure and working principle
Type: Diagonal disc axial piston variable displacement pump.
Core components: spindle, cylinder body, plungers (usually 9 or 11), swash plate, port plate, variable control mechanism.
Working principle: The main shaft drives the cylinder body to rotate, and the plunger inside the cylinder body rotates with the cylinder body. At the same time, due to its close contact with a tilting plate that can change the angle, the plunger will make reciprocating motion in the cylinder hole. The larger the angle of the inclined plate, the longer the stroke of the plunger, and the greater the amount of oil discharged per revolution; When the angle of the inclined plate is 0, the displacement is 0. By changing the angle of the inclined plate, stepless variables can be achieved.
Control mode: A4VG180 has multiple variable control forms to choose from, which is the key to its flexibility. Common ones include:
EP (Electric Proportional Control): By receiving electrical signals through a proportional solenoid valve, it accurately controls the angle of the swash plate and the displacement of the pump.
HD (Hydraulic Remote Control): Controlled by external pilot pressure oil.
DA (Pressure Related Variable Control): Constant power control, which automatically reduces the displacement when the output pressure of the pump increases, keeping the power roughly constant and protecting the prime mover (such as a diesel engine) from overload.
DA+DA: Dual power curve control, suitable for equipment with different power modes of the engine (such as the economy mode and power mode of excavators).
LR (Load Sensitive Control): The output pressure of the pump is always a constant pressure difference higher than the maximum load pressure of the system, providing only the flow required by the actuator, resulting in significant energy-saving effects.
EZ (Electronic Displacement Control): A more advanced electronic control method.
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