Rexroth Series LA4VSO series Equivalent Replacement Hydraulic Piston Pump
Features
Swashplate axial piston pump.
Adjust the angle of swashplate to realize the stepless variable
Good suction characteristic.
Have the structural design of compact, light weight, low noise characteristics.
The sensitivity of control system.
Flow is proportional to the drivek speed and to the displacement.
Nominal pressure reach to 35 Mpa.
Long service life, high-precision bearings.
Hydrostatic balance slipper, improve the life of pump.
With swashplate angle indicator.
Model Designation
| Hydraulic | L |
Hydraulic Fluid
| Mineral oils | No mark |
| HF; HFB and HFC-Mediums | E |
Axial piston unit
| Variable displacement pump, industrial uses | A4VS |
Type of operation
| Pump, open circuits | O |
Size
| Displacement Vg max(ml/r) |
40 |
71 |
125 |
180 |
250 |
355 |
500 |
Mode of operation
| Pressure control DR |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
DR... |
| Power control with Hyperbolic open,curve LR |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
LR... |
| Manual control MA |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
MA... |
| Electronic control EO |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
EO... |
| Hydraulic control, pilot pressure depenednt HD |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
HD... |
Series
|
√ |
√ |
- |
- |
- |
√ |
- |
10 |
|
|
- |
- |
√ |
√ |
√ |
√ |
√ |
22 |
|
|
- |
√ |
√ |
√ |
√ |
√ |
√ |
30 |
Direction of rotation
|
With view on shaft end |
Clockwise |
R |
| Counter clockwise |
L |
Seals
| NBR Nitrile rubber |
P |
| FKM Fluoro-rubber |
V |
Shaft end
| Keyed parallel shaft |
P |
| Splined shaft |
Z |
Mounting flange 40 71 125 180 250 355 500
| ISO 4 hole |
√ |
√ |
√ |
√ |
√ |
√ |
- |
B |
Service ports
| Port B and port S 90°offset; Auxiliary pressure port B1 Metric fixing screws |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
13 |
| Port B and S 90°offset； Pressure connection B1 connected by flange |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
25 |
Through drive
| Without auxiliary pump, without through drive |
√ |
√ |
√ |
√ |
√ |
√ |
- |
N00 |
Technical Data
Performance parameters (there figure Did not consider the efficiency o mechanical an volumetric efficiency)
| Size |
40 |
71 |
125 |
180 |
250 |
355 |
500 |
||
| Displacement (Vg max) |
cm³/r |
40 |
71 |
125 |
180 |
250 |
355 |
500 |
|
| Max.speed (n max1) |
rpm |
2600 |
2200 |
1800 |
1800 |
1500 |
1500 |
1320 |
|
| Max.output flow | n=n max |
L/min |
104 |
156 |
225 |
324 |
375 |
532 |
600 |
| n=1500rpm |
L/min |
60 |
107 |
186 |
270 |
375 |
532 |
－ |
|
| Max.power | n=n max |
kW |
61 |
91 |
131 |
189 |
219 |
310 |
385 |
| n=1500rpm |
kW |
35 |
62 |
109 |
158 |
219 |
310 |
－ |
|
| Max.torque | △P=35MPa |
N.m |
223 |
395 |
696 |
1002 |
1391 |
1976 |
2783 |
| △P=10MPa |
N.m |
64 |
113 |
199 |
286 |
398 |
564 |
795 |
|
| Weight(approximately) |
kg |
40 |
54 |
87 |
103 |
186 |
206 |
318 |
|
Outline drawing
| size |
40 |
71 |
125 |
180 |
250 |
355 |
500 |
|
| Control moving distance |
mm |
14.2 |
17.3 |
20.7 |
20.7 |
25.9 |
25.9 |
32.6 |
| Control area |
cm² |
3.9 |
6.4 |
9 |
9 |
14.4 |
14.4 |
18.8 |
| Control volume |
cm³ |
5.5 |
11 |
18.7 |
18.7 |
37.3 |
37.3 |
61.4 |
| Min.control pressure |
MPa |
3 |
3 |
5 |
5 |
5 |
5 |
5 |
| Control time 20MPa pressure |
s |
0.1 |
0.1 |
0.1 |
0.1 |
0.2 |
0.2 |
0.8 |
(2)EO Hydraulic displacement control HD
Outline
In the EO electric control work,the pump flow could set by proportion direction valve.Meanwhile,pump's current flow through inductance type position transducer feedback signal.
This pump could reset the cylinder's zero position by the spring controls in the situation of normal pressure.Do not reset at high-pressured work.Simultaneously,in order to reduce controls cylinder's loss of flow,all size of hydraulic pressure fluid cylinder cavity is sealed.
Outline drawing
| size |
40 |
71 |
125 |
180 |
250 |
355 |
500 |
|
| Control cylinder’s moving distance |
mm |
14.2 |
17.3 |
20.7 |
20.7 |
25.9 |
25.9 |
32.8 |
| Control cylinder area |
cm² |
8.1 |
12.6 |
18.1 |
16.1 |
28.3 |
28.3 |
38.2 |
| Control volume |
cm³ |
11.4 |
21.5 |
37.5 |
37.5 |
73.2 |
73.2 |
124.5 |
| Min.control pressure |
MPa |
10 |
10 |
10 |
12.5 |
12.5 |
12.5 |
15 |
| Max.control pressure |
MPa |
31.5 |
31.5 |
31.5 |
31.5 |
31.5 |
31.5 |
31.5 |
| Control time |
s |
0.1 |
0.12 |
0.2 |
0.2 |
0.25 |
0.25 |
0.3 |
(3)LR Power control LR
Outline
At the very beginning,the control scope could use the mechanical way to set, the setting value scope could use the spring and screw to adjust.When the pressure decreases,we could adjust spring and enter its starting position,the setting range of preset value:3.5MPa--35MPa.The smallest and the biggest angle of rotation's limit can use the mechanical way,adjustment to Vg max 50%.
