Hz - Two-Point Hydraulic Control - Bosch Rexroth A6VM series 71 Manual

HZ – Two-point hydraulic control
The two-point hydraulic control allows the displacement to
be set to either V or V
g min
sure at port X on or off.
HZ5, HZ7 negative control
▶ Position at V (without pilot pressure, maximum
g max
torque, minimum speed)
▶ Position at V (with pilot pressure > 145 psi (10 bar)
g min
activated, minimum torque, maximum permissible
speed)
▼ Characteristic curve HZ5, HZ7
1450 (100)
145 (10)
0
V V
Displacement
g min g max
Note
▶ Maximum permissible pilot pressure: 1450 psi (100 bar)
▶ The control oil is internally taken out of the high pres-
sure side of the motor (A or B). For reliable control, an
operating pressure of at least 435 psi (30 bar) is
required in A (B). If a control operation is performed at
an operating pressure < 435 psi (30 bar), an auxiliary
pressure of at least 435 psi (30 bar) must be applied at
port G via an external check valve. For lower pressures,
please contact us.
Please note that pressures up to 7250 psi (500 bar) can
occur at port G.
by switching the pilot pres-
g max
Axial piston variable motor | A6VM series 71
HZ – Two-point hydraulic control
Response time damping
The response time damping is influencing the stroke char-
acteristics of the motor and thus the reaction speed of the
machine.
Standard with Size 150 to 215
HZ5 with throttle pin on both sides, symmetrical (as to table)
Standard with Size 60 to 115
HZ7 (Synchronizing piston) with throttle pin on both sides,
symmetrical (as to table)
▼ Overview Throttle Pins
Size 60
[inch] 0.012
Groove
size
[mm] 0.30
▼ Circuit diagram HZ5 (negative control) size 150 to 215
G
U T
1
T
2
M
1
▼ Circuit diagram HZ7 (negative control) size 60 to 115
U T
1
V
g min
V
g max
T
2
G
RE-A 91610/12.2015, Bosch Rexroth Corp.
85 115 150 170
0.012 0.012 0.022 0.022
0.30 0.30 0.55 0.55
X
B
V
g min
V
g max
A
B
A
X
15
215
0.026
0.65