Bosch Rexroth A7VO 63 Series, Manual

Page: 7 / 42

RE 92202 /02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
Technical data
7
Technical data
Size NG 28 55 80 107 160
Displacement, geometric, per revolution V
g max
cm
3
28.1 54.8 80 107 160
Maximum rotational
speed
1)
At V
g max
n
nom
rpm 3150 2500 2240 2150 1900
At V
g
< 0.74 × V
g max
n
max1
rpm 4250 3400 3000 2900 2560
Maximum rotational
speed
2)
n
max2
rpm 4750 3750 3350 3200 2850
Flow At V
g max
and n
nom
q
v
l/min 89 137 179 230 304
Power At V
g max
, n
nom
and Δp = 350 bar P kW 52 80 105 134 177
Torque
At V
g max
and Δp = 350 bar T
Nm 156 305 446 596 891
Rotary stiffness V
g max
to V
g
/2 c
min
kNm/rad 5 10 16 21 36
V
g
/2 to 0 (interpolated) c
max
kNm/rad 16 32 49 67 104
Moment of inertia rotary group J
GR
kgm² 0.0042 0.0042 0.0080 0.0127 0.0253
Maximum angular acceleration α rad/s² 35900 31600 24200 19200 15300
Case volume
V
l 0.5 0.75 1.2 1.5 2.4
Weight (approx.) m kg 17 25 40 49 71
▼ Maximum permissible speed (limit speed)
0.6 0.7 0.8 0.9 1.0
2.3
2.0
1.8
1.6
1.4
1.2
1.1
1.0
0.9
0.8
1.9
1.7
1.5
1.3
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
Displacement V
g
/ V
g max
Speed
n
/
n
nom
Inle
t pr
es
sur
e
p
abs
Determining operating characteristics
Flow q
v
=
V
g
× n × η
v
[l/min]
1000
Torque T =
V
g
× Δp
[Nm]
20 × π × η
mh
Power
P
=
2 π × T × n
=
q
v
× Δp
[kW]
60000 600 × η
t
Key
V
g
= Displacement per revolution [cm 3 ]
Δp
= Differential pressure [bar]
n = Rotational speed [rpm]
η
v
= Volumetric efficiency
η
mh
= Mechanical-hydraulic efficiency
η
t
= Total efficiency ( η
t
= η
v
× η
mh
)
Notes
▶ Theoretical values, without efficiency and tolerances;
values rounded
▶ Operation above the maximum values or below the
minimum values may result in a loss of function, a
reduced service life or in the destruction of the axial
piston unit. Other permissible limit values, such as
speed variation, reduced angular acceleration as a
function of the frequency and the permissible angular
acceleration at start (lower than the maximum angular
acceleration) can be found in data sheet 90261.
1)
The values are valid:
‒ At absolute pressure
p
abs
= 1 bar at suction port S
‒ For the optimal viscosity range of ν
opt
= 36 to 16 mm 2 /s
‒ For hydraulic fluid based on mineral oils.
2)
Maximum rotational speed (speed limit) for increased inlet
pressure
p
abs
at suction port S and V
g
< V
g max
, see diagram.