Hd - Proportional Hydraulic Control - Bosch Rexroth A7VO 63 Series Manual

Axial piston variable pump
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18
A7VO Series 63 | Axial piston variable pump
HD – Proportional hydraulic control
HD – Proportional hydraulic control
The proportional hydraulic control provides continuous
control of the displacement. Control is carried out propor-
tional to the pilot pressure applied at port X
▶ Maximum permissible pilot pressure p
▶ Control from V
to V
g min
As the pilot pressure increases, the pump swivels to a
larger displacement.
▶ Start of control (at V
g min
When ordering, state the start of control in plain text.
A control pressure of 40 bar is needed to swivel the pump
from its initial position V
g min
The necessary control power is taken from the operating
pressure or the external control pressure applied to port Y
To ensure that control is guaranteed at a low operating
pressure of < 40 bar too, port Y
external control pressure of about 40 bar.
Bosch Rexroth AG, RE 92202/02.2015
.
1
 = 40 bar
St
(positive control)
g max
) can be set to 4 to 15 bar
to V
.
g max
must be supplied with an
3
▼ Characteristic curve HD1 positive control
increase in control pressure (V
40
35
30
25
20
15
10
5
4
0
0.2
.
3
Displacement V
▼ Schematic HD
U
R
1
V
g min
V
g max
R
2
 – V
) Δp = 10 bar
g min
g max
0.4
0.6
0.8
1.0
/V
g
g max
M
1
B(A)
A
1
T
1
X
3
S
Y
3
X
1

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