Specification
| Main technical parameters of the A4VG series variable axial piston pump | |||||||||
| Pump Specifications | unit | 28 | 40 | 56 | 71 | 90 | 125 | 180 | 250 |
| Max. Speed | rpm | 4250 | 4000 | 3600 | 3300 | 3050 | 2850 | 2500 | 2400 |
| Min. Speed | rpm | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 |
| Flow-Max. Speed | L/min | 119 | 160 | 202 | 234 | 275 | 356 | 450 | 600 |
| Power-Max. Speed | kw | 79 | 107 | 134 | 156 | 3 | 237 | 300 | 400 |
| Spindle Moment of Inertia | kgm² |
0.0022 | 0.0038 | 0.0066 | 0.0097 | 0.0149 | 0.0232 | 0.0444 | 0.0983 |
| Max. Deceleration | rad/s² | 38000 | 30000 | 24000 | 21000 | 18000 | 14000 | 11000 | 6700 |
| Max. Speed Fluctuation | rpm | 103 | 81 | 72 | 69 | 64 | 55 | 50 | 34 |
| Max. Capacity Shell | L | 0.9 | 1.1 | 1.5 | 1.3 | 1.5 | 2.1 | 3.1 | 6.3 |
| Weight | kg | 29 | 31 | 38 | 50 | 60 | 80 | 101 | 156 |
Characteristic
- Axial piston variable pump with swashplate structure, used in static hydraulic transmission in closed circuits.
- Flow rate is proportional to the driving speed and displacement, and can be adjusted continuously.
- Output flow increases from zero to the maximum value as the swash plate angle increases.
- Allowing the swashplate to move to the neutral position enables the fluid flow direction to be changed smoothly.
- A variety of highly compatible control devices, providing various control and adjustment functions.
- Each high-pressure side is equipped with two relief valves to prevent overload of the hydrostatic transmission (pump and motor).
- Overflow valve also has the function of a supplementary oil valve.
- Internal oil replenishment pump is used for supplying oil and controlling the pump.
- Maximum refueling pressure is limited by the built-in refueling relief valve.
- Built-in pressure cut-off valve is a standard feature.
Control Method
NV type, without control device
DG- Hydraulic control, direct control type
EZ - Electrical two-point control, with switch electromagnet
HD - Hydraulic control, related to pilot pressure
HW - Hydraulic Control, Mechanical Servo
EP - Electrical Control, with proportional electromagnet
DA - Hydraulic control, related to rotational speed
Technical Advantage
1. High efficiency and energy saving: The flow rate can be adjusted steplessly to match the load demand and reduce
energy consumption.
2. High reliability: Redundant protection design (relief valve + oil replenishment valve + pressure cut-off) extends
equipment service life.
3. Compatibility: The modular control interface is compatible with various hydraulic control systems.
Summarize
The Rexroth A4VG series, with its slotted variable structure, multiple mode control options and high pressure rating (400 bar),
has become the preferred power component for closed hydraulic circuits. Its built-in oil replenishment pump and dual overflow
protection design significantly enhance the stability and safety of the system in heavy machinery. For scenarios requiring precise
flow control or frequent direction changes, the EP or HW control models offer better dynamic response.
