Bosch Rexroth A6VM series 71 User Manual

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
Operating pressure range
7
Operating pressure range
Pressure at working port A or B Definition
Nominal pressure p
nom
6500 psi (450bar) The nominal pressure corresponds to the maximum design pressure.
Maximum pressure p
max
7250psi (500bar) The maximum pressure corresponds to the maximum operating pres-
sure within the single operating period. The sum of the single operating
periods must not exceed the total operating period.
Single operating period 10s
Total operating period 300h
Minimum pressure
(high-pressure side)
365psi (25bar) Minimum pressure at the high-pressure side (A or B) which is required
in order to prevent damage to the axial piston unit.
Minimum pressure – pump operating
mode (inlet)
See the diagram below To prevent damage to the axial piston motor in pump operating mode
(change of high-pressure side with unchanged direction of rotation, e. g.
when braking), a minimum pressure must be guaranteed at workingport
(inlet). This minimum pressure is dependent on the speed and displace-
ment of the axial piston unit (see characteristic curve)
Summation pressure p
Su
(pressure A + pressure B)
10150psi (700bar) The summation pressure is the sum of the pressures at both working
ports (A and B)
Rate of pressure change R
Amax
Maximum permissible rate of pressure build-up and reduction during a
pressure change over the entire pressure range.
With integrated pressure-relief valve 130530psi/s (9000bar/s)
Without pressure-relief valve 232060psi/s (16000bar/s)
▼ Rate of pressure change R
Amax
p
nom
∆t
∆p
Time t
Pressure p
▼ Pressure definition
Single operating period
Pressure p
t
1
t
2
t
n
Minimum pressure (high-pressure side)
Maximum pressure p
max
Nominal pressure p
nom
Time t
Total operating period = t
1
+ t
2
+ ... + t
n
▼ Minimum pressure – pump operating mode (inlet)
V
g max
V
g x
0.3 V
g max
15 (1)
30 (2)
60 (4)
90 (6)
115 (8)
145 (10)
175 (12)
200 (14)
230 (16)
0 0.4 0.7 1.0 1.3 1.6
Inlet pressure p
abs
[psi (bar)]
Rotational speed n / n
nom
This diagram is valid only for the optimum viscosity range
from
ν
opt
=170to73SUS (36 to 16mm
2
/s).
Please contact us if these conditions cannot be satisfied.
Note
Operating pressure range valid when using hydraulic
fluids based on mineral oils. Values for other hydraulic
fluids, please contact us.

Bosch Rexroth A6VM series 71 Specifications

General

Brand	Bosch
Model	Rexroth A6VM series 71
Category	Engine
Language	English