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A4VG series
A4VG series
Closed circuit swash-plate variable pump with its own charge pump and dual high pressure relief valves. Sits on the pump side of travel drives, speed set by HD or EP pilot control.
Features
- Swash-plate axial piston variable pump for hydrostatic drives in closed circuits
- Flow is proportional to drive speed and displacement, and is infinitely variable
- Output flow increases from zero to maximum as the swash-plate angle changes
- Sweeping the swash plate through centre reverses the flow direction smoothly
- A wide range of compatible control devices provides various control and adjustment functions
- Two relief valves on each high-pressure side prevent overload of the hydrostatic drive (pump and motor)
- The relief valves also function as charge valves
- Integrated charge pump serves as supply and control pump
- Maximum charge pressure is limited by the integrated charge relief valve
- Integrated pressure cut-off valve is standard
Technical data
| Size | 28 | 40 | 56 | 71 | 90 | 125 | 180 | 250 |
|---|---|---|---|---|---|---|---|---|
| Displacement · variable pumpVg max · cm³ | 28 | 40 | 56 | 71 | 90 | 125 | 180 | 250 |
| Displacement · charge pump (p=20 bar)Vg SP · cm³ | 6.1 | 8.6 | 11.6 | 19.6 | 19.6 | 28.3 | 39.8 | 52.5 |
| Speed · max. at Vg maxnmax continuous · rpm | 4250 | 4000 | 3600 | 3300 | 3050 | 2850 | 2500 | 2400 |
| Speed · limited maximum ①nmax limited · rpm | 4500 | 4200 | 3900 | 3600 | 3300 | 3250 | 2900 | 2600 |
| Speed · intermittent maximum ②nmax interm. · rpm | 5000 | 5000 | 4500 | 4100 | 3800 | 3450 | 3000 | 2700 |
| Speed · minimumnmin · rpm | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 |
| Flow · at nmax continuous and Vg maxqV max · l/min | 119 | 160 | 202 | 234 | 275 | 356 | 450 | 600 |
| Power ③ (Δp=400 bar)Pmax · kW | 79 | 107 | 134 | 156 | 183 | 237 | 300 | 400 |
| Torque ③ · at Vg max (Δp=400 bar)Tmax · Nm | 178 | 255 | 356 | 451 | 572 | 795 | 1144 | 1590 |
| Torque ③ · at Vg max (Δp=100 bar)T · Nm | 44.5 | 63.5 | 89 | 112.8 | 143 | 198.8 | 286 | 398 |
| Moment of inertia of drive shaft (rotating parts)J · kgm² | 0.0022 | 0.0038 | 0.0066 | 0.0097 | 0.0149 | 0.0232 | 0.0444 | 0.0983 |
| Max. angular acceleration ④rad/s² | 38000 | 30000 | 24000 | 21000 | 18000 | 14000 | 11000 | 6700 |
| Max. speed change ④rpm | 103 | 81 | 72 | 69 | 64 | 55 | 50 | 34 |
| Torsional stiffness · shaft SNm/rad | 31400 | 69000 | 80800 | 98800 | 158100 | 218300 | 244500 | 354500 |
| Torsional stiffness · shaft TNm/rad | – | – | 95000 | 120900 | – | 252100 | 318400 | 534300 |
| Torsional stiffness · shaft ANm/rad | – | 79600 | 95800 | 142400 | 176800 | 256500 | – | – |
| Torsional stiffness · shaft ZNm/rad | 32800 | 67500 | 78800 | 122800 | 137000 | 223700 | 319600 | 624200 |
| Torsional stiffness · shaft UNm/rad | – | 50800 | – | – | 107600 | – | – | – |
| Filling volumeV · L | 0.9 | 1.1 | 1.5 | 1.3 | 1.5 | 2.1 | 3.1 | 6.3 |
| Weight approx. (without through-drive)m · kg | 29 | 31 | 38 | 50 | 60 | 80 | 101 | 156 |
Data table: theoretical values, excluding efficiency and tolerances; figures rounded. ① Limited maximum. ② Intermittent maximum. ③ At nmax continuous and Vg max. ④ Applies to all shaft ends.