Bosch Rexroth A6VM series 71 User Manual

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
HZ – Two-point hydraulic control
15
HZ – Two-point hydraulic control
The two-point hydraulic control allows the displacement to
be set to either V
g min
or V
g max
by switching the pilot pres-
sure at port X on or off.
HZ5, HZ7 negative control
▶ Position at V
g max
(without pilot pressure, maximum
torque, minimum speed)
▶ Position at V
g min
(with pilot pressure >145psi (10bar)
activated, minimum torque, maximum permissible
speed)
▼ Characteristic curve HZ5, HZ7
V
g min
V
g max
Displacement
0
145 (10)
Pilot pressure Δp
S
[psi (bar)]
1450 (100)
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.
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 85 115 150 170 215
Groove
size
[inch] 0.012 0.012 0.012 0.022 0.022 0.026
[mm] 0.30 0.30 0.30 0.55 0.55 0.65
▼ Circuit diagram HZ5 (negative control) size 150 to 215
T
2
T
1
M
1
V
g min
V
g max
B
A
X
G
U
▼ Circuit diagram HZ7 (negative control) size 60 to 115
T
1
U
T
2
X
G
V
g min
V
g max
B
A

Bosch Rexroth A6VM series 71 Specifications

General

Brand	Bosch
Model	Rexroth A6VM series 71
Category	Engine
Language	English