Features
▶ Variable double pump with two axial piston rotary
groups of swashplate design for hydrostatic drives in a
closed circuit
▶ The flow is proportional to the drive speed and displace-
ment.
▶ The flow can be infinitely varied by adjusting the swash-
plate angle.
▶ Flow direction changes smoothly when the swashplate
is moved through the neutral position.
▶ Only one shared port for case drain fluid for both circuits
▶ Compact design for tight installation conditions
Note
Only for series no smaller than 200 units per year.
Please contact us regarding smaller series.
RE 93221/05.2014, Bosch Rexroth AG
▶ Size 45
▶ Nominal pressure 380 bar
▶ Maximum pressure 420 bar
▶ Closed circuit
Axial piston variable double pump
A22VG series 40
RE 93221
Edition: 05.2014
Replaces: 06.2012
Contents
Ordering code 2
Hydraulic fluids 4
Shaft seal 5
Operating pressure range 6
Technical data 7
HW−proportional hydraulic control, mechanical servo 9
EP−proportional electric control 11
HT−hydraulic control, direct controlled 13
ET−electric control, direct controlled 14
DA−control valve, fixed setting 15
Dimensions, size 45 16
Through drive dimensions 19
Overview of attachment options 19
Boost pump 20
High-pressure relief valves 20
Mechanical stroke limiter 21
Ports X
3
and X
4
for stroking chamber pressure 21
Swivel angle sensor 22
Connector for solenoids 23
Installation dimensions for coupling assembly 23
Installation instructions 24
Project planning notes 26
Safety instructions 26
Bosch Rexroth AG, RE 93221/05.2014
2 A22VG series 40 | Axial piston variable double pump
Ordering code
Axial piston unit
01 Swashplate design, variable, nominal pressure 380 bar, maximum pressure 420 bar
A22V
Operating mode
02 Double pump, closed circuit
G
Size (NG)
03 Geometric displacement, see technical data on page7
045
Control device
04 Proportional control hydraulic
mechanical servo, hexagon shaft with lever, free position
1)
without neutral position switch
HW2
with neutral position switch
HW8
Proportional control electric U = 12 V DC
EP1
U = 24 V DC
EP2
Hydraulic control, direct operated
HT1
Electric control, direct operated;
two pressure reducing valves per circuit
U = 12 V DC
ET1
U = 24 V DC
ET2
Connector for solenoids
2)
(see page 23)
05 Without connector (without solenoid, only for hydraulic control)
0
DEUTSCH – molded connector, 2-pin – without suppressor diode
P
Swivel angle sensor (see page 22)
06 Without swivel angle sensor
0
Electric swivel angle sensor mounted
3)
R
Pilot pressure ports HW HT EP ET
07 Ports X
1
and X
2
● ‒ ● ● 1
Ports X
3
and X
4
‒ ● ‒ ‒ 3
Ports X
1
, X
2
and X
3
, X
4
● ‒ ● ● 4
Ports X
5
and X
6
‒ ● ‒ ‒ 5
Mechanical stroke limiter (see page 22)
08 Without mechanical stroke limiter
0
One-sided mechanical stroke limiter, externally adjustable, on opposite side to service line ports
F
DA control valve (see page 15) HW HT EP ET
09 Without DA control valve
● ● ● ● 0
DA control valve fixed setting
● ● ● ‒ 1
Series
10 Series 4, index 0
40
Configuration of ports and fastening threads
11 ANSI, port threads with O-ring seal according to ISO 11926
A
Ordering code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20
A22V G 045 / 40 A N B2 S7 3 A –
1) On delivery, the position of the lever may differ from that shown in
the brochure or drawing. If necessary, the position of the lever can
be adjusted by the customer.
2) Connectors for other electric components can deviate.
3) Please contact us if the swivel angle sensor is used for control
●
= Available – = Not available
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Ordering code
3
Direction of rotation
12 Viewed on drive shaft clockwise
R
counter-clockwise
L
Sealing material
13 NBR (nitrile-rubber), shaft seal in FKM (fluoroelastomer)
N
Mounting flange
14 SAE J744, 101-2
B2
Drive shaft (permissible input torque, see page 17)
15 Splined shaft ANSI B92.1a, 1 1/4 in14T 12/24DP
S7
Service line ports
16 Threaded ports A and B, left (viewed on drive shaft)
3
Boost pump
4)
17 Without boost pump (standard)
U
Boost pump
F
Through drive (mounting options, see page 19)
18 Flange SAE J744 Hub for splined shaft
5)
Diameter Mounting
6)
Designation Diameter Designation
101-2 (B)
B2 7/8 in 13T 16/32DP S4
B2S4
1 in 15T 16/32DP S5
B2S5
Pressure-relief valve
19 High-pressure relief valve, direct operated, without bypass (for values, see page 20)
A
Standard / special version
20 Standard version
0
Standard version with installation variants, e.g. T ports against standard open or closed
Y
Special version
S
●
= Available – = Not available
Notes
▶ Observe the project planning notes on page26!
▶ A pressure cut-off is not available for this unit.
▶ Preservation:
– up to 12 months as standard
– up to 24 months long-term
(state in plain text when ordering)
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20
A22V G 045 / 40 A N B2 S7 3 A –
4) Pressure or suction filtration required. To be supplied by customer.
Boost pressure inlet at port G, a DA control valve is used at port G1.
5) Hub for splined shaft according to ANSI B92.1a
6) Mounting drillings pattern viewed on through drive with control at top
Bosch Rexroth AG, RE 93221/05.2014
4 A22VG series 40 | Axial piston variable double pump
Hydraulic fluids
Hydraulic fluids
The A22VG variable double pump is designed for operation
with HLP mineral oil according to DIN 51524.
Application notes and requirements for hydraulic fluids
should be taken from the following data sheets before the
start of project planning:
▶ 90220: Hydraulic fluids based on mineral oils and
related hydrocarbons
▶ 90221: Environmentally acceptable hydraulic fluids
▶ 90222: Fire-resistant, water-free hydraulic fluids
(HFDR/HFDU)
Details regarding the selection of hydraulic fluid
The hydraulic fluid should be selected such that the
operating viscosity in the operating temperature range is
within the optimum range (ν
opt
see selection diagram).
Note
At no point of the component may the temperature be
higher than 115 °C. The temperature difference specified
in the table is to be taken into account when determining
the viscosity in the bearing.
If the above conditions cannot be maintained due to
extreme operating parameters, please contact the responsible
member of staff at Bosch Rexroth.
Viscosity and temperature of hydraulic fluids
Viscosity Temperature Comment
Cold start
ν
max
≤1600 mm
2
/s θ
St
≥-40°C t≤3 min, n≤1000
rpm, without load p≤50 bar
Permissible temperature difference
ΔT≤25K
between axial piston unit and hydraulic fluid in the system
Warm-up phase
ν<1600 to 400 mm
2
/s θ=-40°C to -25°C At p≤0.7×p
nom
, n≤0.5×n
nom
and t≤15min
Continuous operation
ν=400 to 10 mm
2
/s
This corresponds, for example on the VG46, to a temperature
range of +5°C to +85 °C (see selection diagram)
θ=-25°C to +110°C
measured at port T
Note the permissible temperature range of the shaft seal
(ΔT=approx.5K between the bearing/shaft seal and port T)
ν
opt
=36 to 16 mm
2
/s
Range of optimum operating viscosity and efficiency
Short-term operation
ν
min
≥7 mm
2
/s t<3 min, p<0.3×p
nom
▼ Selection diagram
–40 –25 –10 10 30 50 90 11570
0
7
10
40
60
20
100
200
400
600
1000
1600
VG 22
VG 32
VG 46
VG 68
VG 100
16
36
Optimum operating viscosity range v
opt
Optimum efficiency
Maximum permissible viscosity for cold start
Minimum permissible viscosity for short-term operation
Temperature t [°C]
Viscosity v [mm
2
/s]
Continuous operation
Warm-up phase
Minimum permissible temperature for cold start
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Shaft seal
5
Filtration of the hydraulic fluid
Finer filtration improves the cleanliness level of the hydraulic
fluid, which increases the service life of the axial piston
unit.
A cleanliness level of at least 20/18/15 is to be maintained
according to ISO 4406.
We recommend, depending on the system and application,
for the A22VG: filter cartridges β
20
≥ 100.
At very high hydraulic fluid temperatures (90°C to maximum
110°C, measured at port T), a cleanliness level of at least
19/17/14 according to ISO 4406 is necessary.
Shaft seal
Permissible pressure loading
The service life of the shaft seal is influenced by the speed
of the axial piston unit and the leakage pressure in the
housing (case pressure). Momentary pressure spikes
(t<0.1s) of up to 10bar are permitted. The service life
of the shaft seal decreases with increasing frequency of
pressure spikes and increasing mean differential pressure.
The case pressure must be equal to or higher than the
ambient pressure.
1000
0
1
2
3
4
5
2000 3000 4000
NG45
Differential pressure Δp [bar]
Rotational speed n [rpm]
The FKM shaft seal may be used for leakage temperatures
from
−25 °C to +115 °C. For application cases below
−25 °C, an NBR shaft seal is required (permissible tempera-
ture range:
−40 °C to +90 °C).
Bosch Rexroth AG, RE 93221/05.2014
6 A22VG series 40 | Axial piston variable double pump
Operating pressure range
Operating pressure range
Pressure at service line port A or B Definition
Nominal pressure p
nom
380 bar absolute The nominal pressure corresponds to the maximum design pressure.
Maximum pressure p
max
420 bar absolute The maximum pressure corresponds to the maximum operating pressure 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)
25 bar absolute 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 (low-pressure side) 10 bar above
case pressure
Minimum pressure at the low-pressure side (A or B) which is required in order to
prevent damage to the axial piston unit. Boost pressure setting must be higher
depending on system.
Rate of pressure change R
Amax
9000bar/s Maximum permissible rate of pressure build-up and reduction during a pressure
change over the entire pressure range.
Boost pump
Nominal pressure p
Sp
nom
25 bar absolute
Maximum pressure p
Sp
max
30bar absolute
Pressure at suction port S (inlet)
Continuous p
Smin
(ν≤30mm
2
/s)
≥0.8bar absolute
Short-term, on cold start
(t<3min)
≥0.5bar absolute
Maximum pressure p
Smax
≤5bar absolute
Control pressure
Minimum control pressure p
St
min
To ensure the function of the control, a minimum control pressure p
St
min
at
n=2000rpm is required depending on the rotational speed and operating pressure.
Controls EP and HW 18bar above
case pressure
Controls ET and HT
25bar above
case pressure
▼ Rate of pressure change R
Amax
p
nom
∆t
∆p
Time t
Pressure p
▼ Pressure definition
Pressure p
t
1
t
2
t
n
Single operating period
Minimum pressure (high-pressure side)
Maximum pressure p
max
Nominal pressure p
nom
Time t
Total operating period = t
1
+ t
2
+ ... + t
n
Note
Operating pressure range valid when using hydraulic
fluids based on mineral oils. Values for other hydraulic
fluids, please contact us.
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Technical data
7
Technical data
Size NG 45
Displacement geometric,
per revolution
variable pump (for each rotary group)
V
gmax
cm
3
2x46
boost pump (at p=25bar) V
g Sp
cm
3
14.9
Rotational speed
1)
maximum at V
gmax
n
nom
rpm 3300
6)
limited maximum
2)
n
max1
rpm 3550
intermittent maximum
3)
n
max2
rpm 3800
minimum
n
min
rpm 500
Flow
at V
gmax
andn
nom
q
v
l/min 2 x 152
Power
4)
at V
gmax
, n
nom
and Δp=380bar P
kW 192
Torque
4)
at V
g max
and Δp=300bar T
Nm 556
Δp = 100 bar T
Nm 146
Rotary stiffness drive shaft 11/4in S7 Pump 1
c
1
Nm/rad 73804
Pump 2
c
2
Nm/rad 23066
Moment of inertia
(see graphic below)
rotary group 1
J
TW1
kgm
2
0.003327
rotary group 2
J
TW2
kgm
2
0.003293
Maximum angular acceleration for each rotary group
5)
α
rad/s² 4000
Case volume
V
L 1.7
Weight with HT control (approx.)
m
kg 53
Determination the 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
)
▼ Spring-mass system with moment of inertia
c1 c2
J
TW1
J
TW2
Notes
▶ Theoretical values, without efficiency levels 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. Bosch Rexroth recommends checking the
loading by means of testing or calculation / simulation
and comparison with the permissible values.
▶ Transport and storage
– θ
min
≥–50°C
– θ
opt
=+5°C to +20°C
1) The values are valid:
– for the optimum viscosity range of ν
opt
=36 to 16mm
2
/s
– with hydraulic fluid based on mineral oil
2) limited maximum speed:
At half corner power (e.g., at V
gmax
and p
nom
/2)
3) Intermittent maximum speed at:
– high idle
– overspeed: ∆p=70to150bar and V
gmax
– reversing peaks: ∆p<300 bar and t<0.1s.
4) Without boost pump
5) The data are valid for values between the minimum required and
maximum permissible rotational speed. Valid for external excitation
(e. g. diesel engine 2 to 8 times rotary frequency; cardan shaft
twice the rotary frequency). The limit value applies for a single
pump only. The load capacity of the connection parts must be
considered.
6) When using a boost pump, please consult with the responsible
plant.
Bosch Rexroth AG, RE 93221/05.2014
8 A22VG series 40 | Axial piston variable double pump
Technical data
Permissible radial and axial forces of the drive shaft
Size NG 45
Drive shaft in 11/4
Maximum radial force at distance a
(from shaft collar)
a
F
q
F
q max
N 3190
a mm 24
Maximum axial force
F
ax
±
± F
ax max
N 1500
Note
Special requirements apply in the case of belt drive and
cardan shaft. Please contact us.
Permissible input and through-drive torques
Size NG 45
Torque at V
gmax
and Δp=380bar
1)
T
Nm 556
Maximum input torque at drive shaft
2)
S7 11/4in
T
E max
Nm 602
Maximum through-drive torque
T
D1 max
Nm 300
T
D2 max
Nm
T
D2perm
=300–T
2
▼ Torque distribution
T
1
T
D1
T
D2
T
E
T
2
T
3
A22VG
Pump 1 Pump 2
Attachment pump
Torque – A22VG 1st pump
T
1
2nd pump
T
2
Torque – attachment pump
T
3
Input torque
T
E
=
T
1
+ T
2
+ T
3
T
E
<
T
E max
Through-drive torque
T
D1
T
D2
1) Efficiency not considered
2) For drive shafts without radial force
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
HW−proportional control hydraulic, mechanical servo
9
HW−proportional control hydraulic, mechanical servo
The output flow of the pump is infinitely variable between
0to 100%, proportional to the swivel angle of the control
lever.
A feedback lever, connected to the stroking piston main-
tains the pump flow for a given position of the control lever.
If the pump is also equipped with a DA control valve
(see page 15), automotive operation is possible for travel
drives.
β [°]
0 0.2 0.4 0.6 0.8 1.00.20.40.60.81.0
40
35
30
25
20
15
10
5
0
5
10
15
20
25
30
35
40
V
g
β [°]
V
g max
V
g
V
g max
Swivel angle β at the control lever for pump displacement
change:
▶ Start of control at β = ±3°
▶ End of control at β (max. displacement V
g max
) at ±30°
▶ Rotation limiting β of the control lever (internal) ±38°
The maximum required torque at the lever is 170 Ncm. To
prevent damage to the HW control module, a mechanical
stop must be provided by the customer for the HW control
lever.
Note
Spring centering enables the pump, depending on pres-
sure and rotational speed, to move automatically to the
neutral position (V
g
=0) as soon as there is no longer
any torque on the control lever of the HW control module
(regardless of deflection angle).
Variation: Neutral position switch
The switch contact in the neutral position switch is closed
when the control lever on the HW control module is in its
neutral position. The switch opens when the control lever
is moved out of neutral in either direction.
Thus, the neutral position switch provides a monitoring
function for drive units that require the pump to be in the
neutral position during certain operating conditions (e.g.
starting diesel engines).
Technical data
Load capacity 20 A (continuous), without switching
operations
Switching capacity 15 A / 32 V (resistive load)
4 A / 32 V (inductive load)
Connector version DEUTSCHDT04-2P-EP04
(Mating connector, see page 23)
▼ Schematic
a
b
ba
AX
1
X
2
X
1
X
2
A M
A
M
A
M
G
G
TR RM
B
B B M
B
Bosch Rexroth AG, RE 93221/05.2014
10 A22VG series 40 | Axial piston variable double pump
HW−proportional control hydraulic, mechanical servo
Assignment of direction of rotation, control and flow direction
Direction of rotation clockwise counter-clockwise
Pump Pump 1 Pump 2 Pump 1 Pump 2
Lever direction a b a b a b a b
Control pressure (X
3
, X
4
optional, see page 21)
X
2
X
1
X
1
X
2
X
2
X
1
X
1
X
2
X
4
X
3
X
3
X
4
X
4
X
3
X
3
X
4
Flow direction A to B B to A B to A A to B B to A A to B A to B B to A
Operating pressure M
B
M
A
M
A
M
B
M
A
M
B
M
B
M
A
M
A
M
A
X
2
X
2
B, AM
B
M
B
B, AX
1
X
1
X
2
, X
1
X
2
, X
1
b
a
a
b
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
EP−Proportional control electric
11
EP−Proportional control electric
The output flow of the pump is infinitely variable between
0to100%, proportional to the electrical current supplied
to solenoid a or b.
The electrical energy is converted into a force acting on the
control spool.
This valve spool then directs control oil into and out of the
stroking cylinder to adjust pump displacement as required.
A feedback lever, connected to the stroking piston maintains
the pump flow for a given current within the control range.
If the pump is also equipped with a DA control valve
(see page 15), automotive operation is possible for travel
drives.
I [mA]
EP1
EP2
I
[mA]
0.2 0.4 0.6 0.8 1.00.40.60.81.0
1200
1000
800
600
400
200
0
00.2
V
g
V
g max
V
g
V
g max
200
400
600
800
1000
1200
(Solenoid A)
(Solenoid B)
Technical data, solenoid EP1 EP2
Voltage 12V(±20%) 24V(±20%)
Control current
Beginning of control at V
g
=0
400 mA 200 mA
End of control at V
g max
1115 mA 560 mA
Current limit 1.54 A 0.77 A
Nominal resistance (at 20°C) 5.5Ω 22.7Ω
Dither frequency 100 Hz 100 Hz
Duty cycle 100 % 100 %
Type of protection, see connector version on page 23
Various BODAS controllers with application software and
amplifiers are available for controlling the proportional
solenoids.
Further information can also be found on the internet at
www.boschrexroth.com/mobile-electronics.
▼ Schematic
ab
A
T
R
X
1
X
2
b
a
R
X
2
X
1
A
M
B
B B M
B
M
A
M
A
M
G
G
Bosch Rexroth AG, RE 93221/05.2014
12 A22VG series 40 | Axial piston variable double pump
EP−Proportional control electric
Assignment of direction of rotation, control and flow direction
Direction of rotation clockwise counter-clockwise
Pump Pump 1 Pump 2 Pump 1 Pump 2
Actuation of solenoid a b a b a b a b
Control pressure (X
3
, X
4
optional, see page 21)
X
2
X
1
X
1
X
2
X
2
X
1
X
1
X
2
X
4
X
3
X
3
X
4
X
4
X
3
X
3
X
4
Flow direction A to B B to A B to A A to B B to A A to B A to B B to A
Operating pressure M
B
M
A
M
A
M
B
M
A
M
B
M
B
M
A
M
A
M
A
X
2
X
2
B, A
M
B
M
B
B, AX
1
X
1
X
2
, X
1
X
2
, X
1
Solenoid aSolenoid b
Solenoid bSolenoid a
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
HT−Hydraulic control, direct operated
13
HT−Hydraulic control, direct operated
With the direct hydraulic control, the flow of the pump is
influenced by a hydraulic control pressure that is applied
directly to the stroking piston through X
5
or X
6
.
Flow direction is determined by which control pressure
port is pressurized (refer to table below).
Pump displacement is infinitely variable and proportional
to the applied control pressure, but is also influenced by
system pressure and pump drive speed.
Maximum permissible control pressure: 30 bar
Use of the HT control requires a review of the engine and
vehicle parameters to ensure that the pump is set up
correctly. We recommend that all HT applications be
reviewed by a Bosch Rexroth application engineer.
The DA control valve only becomes effective if the pilot
control device used for controlling the HT control is
supplied from port Y.
X
6
, X
5
X
6
, X
5
M
A
M
A
B, AB, A
X
6
X
6
X
5
X
5
M
B
M
B
▼ Schematic
M
G
G
M
A
A
TR
X
5
X
6
R
X
6
X
5
A M
A
M
B
B B M
B
Assignment of direction of rotation, control and flow direction
Direction of rotation clockwise counter-clockwise
Pump Pump 1 Pump 2 Pump 1 Pump 2
Control pressure (X
3
, X
4
optional, see page 21)
X
6
X
5
X
5
X
6
X
6
X
5
X
5
X
6
X
4
X
3
X
3
X
4
X
4
X
3
X
3
X
4
Flow direction A to B B to A B to A A to B B to A A to B A to B B to A
Operating pressure M
B
M
A
M
A
M
B
M
A
M
B
M
B
M
A
Bosch Rexroth AG, RE 93221/05.2014
14 A22VG series 40 | Axial piston variable double pump
ET−Electric control, direct operated
ET−Electric control, direct operated
The output flow of the pump is infinitely variable in the
range 0 to 100%. Depending on the preselected current I
(mA) at solenoids a and b of the pressure reducing valves,
the stroking cylinder of the pump is proportionally supplied
with control pressure. The pump displacement that arises
at a certain control current is dependent on the rotational
speed and operating pressure of the pump. A different flow
direction is associated with each pressure reducing valve.
Maximum permissible control pressure: 30 bar
Technical data, solenoid ET1 ET2
Voltage 12V(±20%) 24V(±20%)
Current limit 1.54 A 0.77 A
Nominal resistance (at 20°C) 5.5Ω 22.7Ω
Dither frequency 100 Hz 100 Hz
Duty cycle 100 % 100 %
Type of protection, see connector version on page 23
M
A
M
A
X
2
X
2
B, A
M
B
M
B
B, AX
1
X
1
2
1
2
1
Solenoid b Solenoid a
Solenoid a
Solenoid b
▼ Schematic
A
T
R
X
1
X
2
R
X
2
X
1
A
M
B
B
B
M
B
M
A
M
A
ab
M
G
G
a b
Assignment of direction of rotation, control and flow direction
Direction of rotation clockwise counter-clockwise
Pump Pump 1 Pump 2 Pump 1 Pump 2
Actuation of solenoid a b a b a b a b
Control pressure (X
3
, X
4
op-
tional, see page 21)
X
2
X
1
X
1
X
2
X
2
X
1
X
1
X
2
X
4
X
3
X
3
X
4
X
4
X
3
X
3
X
4
Flow direction A to B B to A B to A A to B B to A A to B A to B B to A
Operating pressure M
B
M
A
M
A
M
B
M
A
M
B
M
B
M
A
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
DA−Control valve, fixed setting
15
DA−Control valve, fixed setting
Speed related pilot pressure supply
The DA closed loop control is an engine speed-dependent
system for travel drives. The built-in DA control valve gener-
ates a pilot pressure which is proportional to pump
(engine) drive speed. The pump displacement is infinitely
variable in each flow direction and is influenced by both
pump drive speed and system pressure.
Increasing the pump drive speed causes the DA control
valve to generate a higher pilot pressure with a resulting
increase in the flow from the pump.
Depending on the selected pump operating characteristics,
increasing system pressure (e.g. machine load) causes the
pump to swivel back towards a smaller displacement.
Diesel engine overload protection (anti-stall) is achieved by
the combination of this pressure-related pump de-stroking,
and the reduction of pilot pressure as the engine speed
drops.
Any additional power requirement, e.g. for hydraulic func-
tions from attachments, could cause the engine speed to
drop further. This would cause a further reduction in pilot
pressure and thus of pump displacement. Automatic power
distribution and full exploitation of the available power are
achieved in this way, both for the travel drive and for the
implement hydraulics, with priority given to the implement
hydraulics.
The DA control valve can also be used in pumps with EP, HT
and HW control modules to protect the combustion engine
against overload.
DA closed loop control is only suitable for certain types of
drive systems and requires review of the engine and vehicle
parameters to ensure that the pump is used correctly and
that machine operation is safe and efficient. We recommend
that all DA applications be reviewed by a Bosch Rexroth
application engineer.
▼ Schematic
DA control valve
M
G
G
M
A
A
TR
X
1
X
2
R
X
2
X
1
A M
A
M
B
B B M
B
G
1
Y
Bosch Rexroth AG, RE 93221/05.2014
16 A22VG series 40 | Axial piston variable double pump
Dimensions size 45
Dimensions [mm]
Dimensions size 45
EP – Proportional control electric
ET – Electric control, direct operated
M
A
M
A
X
2
X
2
T
B, AM
B
M
B
B, AX
1
X
1
G RR
A
A
B B
M
G
M
A
M
A
TRR M
B
M
B
M
G
X
2
,
X
1
X
2
,
X
1
G
2
S
G
2
G
386.3
9.5
ø101.6
-0.054
136.5
97 126.3
146
15
139.3
3037.5
145.5
153
78.4
153.4
213.4
49 49
82
95.5
108.7
108.7
120
73.6
188.9
293.2
430.2
82 74.5
371.2
Version with boost pump
Flange
SAE J744
Pump 1 Pump 2
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Dimensions size 45
17
Dimensions [mm]
▼ Splined shaft SAEJ744
S7 ‒ 11/4in14T12/24DP
1)
28
7/16-14UNC-2B
2)4)
48
9.5
ø40
56
ø80
40
Ports Standard
3)
Size [in]
4)
p
max abs
[bar]
5)
State
7)
A, B Working port ISO 11926 11/16-12UN-2B; 20deep 420 O
S Suction port (only for boost pump) ISO 11926 15/16-12UN-2B; 20deep 5 O
T Drain port ISO 11926 11/16-12UN-2B; 20deep 3 O
R Air bleed ISO 11926 9/16-18 UNF-2B; 13 deep 3 X
X
1
, X
2
Control pressure
(upstream of orifice, only HP, HW, EP, ET)
ISO 11926 9/16-18 UNF-2B; 13 deep 30 X
X
5
, X
6
Control pressure (upstream of orifice, HT only) ISO 11926 9/16-18 UNF-2B; 13 deep 30 O
X
3
, X
4
6)
Stroking chamber pressure ISO 11926 7/16-20 UNF-2B; 12 deep 30 X
Y Pilot pressure, outlet
(only for DA control valve)
ISO 11926 9/16-18 UNF-2B; 13 deep 30 O
G Boost pressure, inlet ISO 11926 3/4-16 UNF-2B; 15 deep 30 O
G
1
Boost pressure, inlet
(only for DA control valve)
ISO 11926 3/4-16 UNF-2B; 13 deep 30 O
G
2
Boost pressure, outlet (only for boost pump) ISO 11926 3/4-16 UNF-2B; 15 deep 30 O
M
G
Measuring boost pressure G ISO 11926 9/16-18 UNF-2B; 13 deep 30 X
M
A
, M
B
Measuring pressure A, B ISO 11926 9/16-18 UNF-2B; 13 deep 420 X
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat
root, side fit, tolerance class 5
2) Thread according to ASME B1.1
3) The spot face can be deeper than specified in the appropriate
standard.
4) For notes on tightening torques, see instruction manual
5) Momentary pressure spikes may occur depending on the
application. Keep this in mind when selecting measuring
devices and fittings.
6) Optional, see page 21
7) O = Must be connected (plugged on delivery)
X = Plugged (normal operation)
Bosch Rexroth AG, RE 93221/05.2014
18 A22VG series 40 | Axial piston variable double pump
Dimensions size 45
Dimensions [mm]
▼ HT – Hydraulic control, direct operated
X
6
, X
5
X
6
, X
5
Y
View Y
DA control valve
Detail X
Y
Y
G
1
G
1
X
136
51
196.4
172.4
93
5.5
▼ DA control valve
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Through drive dimensions
19
Dimensions [mm]
Through drive dimensions
Flange SAEJ744
1)
Hub for splined shaft
2)
Availability Short code
Diameter attachment
3)
Designation Diameter Designation 045
101-2 (B)
B2 7/8 in 13T 16/32DP S4 ● B2S4
1 in 15T 16/32DP S5 ● B2S5
▼ 101-2
146
ø101.6
386.3
25º
10
(to mounting flange)
O-ring
5)
1/2in13UNC-2B; 18.5deep
4)
Overview of attachment options
Through
drive
Attachment option−additional pumps
Flange Hub for splined
shaft
Short code A10VG
NG (shaft)
A10V(S)O/53
NG (shaft)
External gear pump
6)
101-2 (B) 7/8 in B2S4 18 (S) 28 (S) Series N, NG20 to 36
45 (U) Series G, NG32 to 50
1 in B2S5 28, 45 (S) 45 (S) −
60 (U)
Combination pumps
By using combination pumps, it is possible to have inde-
pendent circuits without the need for splitter gearboxes.
When ordering combination pumps, the type designations
of the 1st and 2nd pump must be linked by a "+".
Ordering example
A22VG045HT100100/40AR + AZPN....
The A22VG variable double pump is permissible without
additional supports where the dynamic mass acceleration
does not exceed maximum 10g(=98.1m/s
2
). When
mounting another pump on the A22VG, the mounting flange
must be rated for the permissible mass torque.
1) The through-drive flange is only supplied with the fastening thread
corresponding to the ordering code designation.
2)
According to ANSI B92.1a, 30° pressure angle, flat root, side fit,
tolerance class 5
3) Mounting drillings pattern viewed on through drive, with control
at top
4) Thread according to ASME B1.1,
for notes on tightening torques, see instruction manual
5) O-ring included in the scope of delivery
6) Bosch Rexroth recommends special versions of the external
gear pumps. Please contact us.
Bosch Rexroth AG, RE 93221/05.2014
20 A22VG series 40 | Axial piston variable double pump
Boost pump
Boost pump
The boost pump continuously supplies a volume of fluid
(boost volume) from a reservoir to the low-pressure side of
the closed circuit via a check valve to replenish the internal
leakage of the variable double pump and consumer.
The boost pump is an internal gear pump that is driven
directly via the drive shaft. The pressure port G
2
of the
boost pump must be externally piped up to port G
(or G
1
by the customer for version with DA control valve)
(see example circuit diagram below). Suction or pressure
filtration is to be provided by the customer.
▼ Schematic
High-pressure relief valves
The four high-pressure relief valves protect the hydrostatic
transmission (pump and motor) from overload. They limit
the maximum pressure in the respective high-pressure line
and serve simultaneously as boost valves.
High-pressure relief valves are not working valves and are
only suitable for pressure spikes or high rates of pressure
change.
Setting the valves
p
Sp
q
v1
(n
= 1000 min
-1
)
q
v max
(n
= n
max
)
p
Sp
p
max
≥ 30 bar
Operating pressure p
A, B
at port A, B
Δp Drive
design
Differential pressure Δp
HD
HD valve setting
Boost pressure
Safety
▶ The valve settings are made at n = 1000 rpm and at
V
g max
(q
v 1
). There may be deviations in the cracking
pressures with other operating parameters.
▶ The differential pressure setting is preset in therange
Δp=250to390bar in increments of 10bar.
▶ When ordering, state differential pressure setting in
plain text.
Settings on high-pressure relief valve A and B
(Pump 1 and 2)
Differential pressure setting
Δp
HD
= ... bar
Cracking pressure of the HD valve (at q
V 1
)
(p
max
= Δp
HD
+ p
Sp
)
p
max
= ... bar
ab
A
T
R
X
1
X
2
b
a
R
X
2
X
1
A
M
B
B B M
B
M
A
M
A
M
G
G
S
G
2
Piping by customer
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Mechanical stroke limiter
21
Dimensions [mm]
Mechanical stroke limiter
The mechanical stroke limiter is an additional function
allowing the maximum displacement of the pump to be
steplessly reduced, regardless of the control module used.
With one threaded pin per pump, the stroke of the stroking
piston and thus the maximum swivel angle per pump is
limited on one side.
Dimensions
103.6
99
263.2
99
22.5
22.5
▼ Schematic
Mechanical stroke limiter, on one side
A
T
R
X
1
X
2
R
X
2
X
1
A
M
B
B
B
M
B
M
A
M
A
ab
M
G
G
a b
Ports X
3
and X
4
for stroking chamber pressure
Dimensions
23.5 21
23.5
21
79.579.5
7979.5
103.6
263.2
X
3
X
3
X
4
X
4
X
3
X
4
X
3
X
4
X
1
X
1
X
2
X
2
▼ Schematic
ab
A
T
R
X
3
X
4
b
a
R
X
2
X
1
A
M
B
B B M
B
M
A
M
A
M
G
G
X
1
X
2
Ports Standard
1)
Size [in]
2)
p
max abs
[bar]
3)
State
4)
X
3
, X
4
Stroking chamber pressure ISO 11926 7/16-20 UNF-2B; 12 deep 30 X
1) The spot face can be deeper than specified in the appropriate
standard.
2) For notes on tightening torques, see instruction manual
3) Momentary pressure spikes may occur depending on the application.
Keep this in mind when selecting measuring devices and fittings.
4) X = Plugged (in normal operation)
Bosch Rexroth AG, RE 93221/05.2014
22 A22VG series 40 | Axial piston variable double pump
Swivel angle sensor
Dimensions [mm]
Swivel angle sensor
For the swivel angle indicator, the pump swivel angle is
measured by an electric swivel angle sensor.
As an output parameter, the Hall-effect swivel angle
sensor delivers a voltage proportional to the swivel angle
(see table of output voltages).
Please contact us if the swivel angle sensor is used for
control.
Characteristics
Supply voltage U
b
10 to 30 V DC
Output voltage U
a
1V
(V
g max
)
2.5V
(V
g 0
)
4V
(V
g max
)
Reverse polarity protection Short circuit-resistant
EMC resistance Details on request
Operating temperature range –40°C to +115°C
Vibration resistance
sinusoidal vibration
EN 60068-2-6
10g / 5 to 2000 Hz
Shock resistance
continuous shock IEC 68-2-29
25g
Salt spray resistance
DIN 50 021-SS
96h
Type of protection with mounted
mating connector
IP67 (DIN/EN 60529) and
IP69K (DIN 40050-9)
Housing material Plastic
Output voltage
Direction of
rotation
Flow
direction
1)
Operating
pressure
Output voltage
cw B to A M
A
> 2.5 V
A to B M
B
< 2.5 V
ccw A to B M
B
> 2.5 V
B to A M
A
< 2.5 V
▼ Schematic
U
α
U
α
ab
A
T
R
X
1
X
2
b
a
R
X
2
X
1
A
M
B
B B M
B
M
A
M
A
M
G
G
Electric swivel angle sensor Electric swivel angle sensor
Dimensions
79.6
123
287.2
W
V
V
Supply voltage U
b
Output voltage U
a
Ground
View W
Parts view V not to scale
connector DT04-3P-EP04
▼ Mating connector DEUTSCH DT06-3S-EP04
Consisting of DT designation
1 housing DT06-3S-EP04
1 wedge W3S
3 sockets 0462-201-16141
The mating connector is not included in the scope of deliv-
ery. This can be supplied by Bosch Rexroth on request
(material number R902603524).
1) For flow direction, see controls
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Connector for solenoids
23
Dimensions [mm]
Connector for solenoids
DEUTSCH DT04-2P-EP04
Molded, 2-pin, without bidirectional suppressor diode.
There is the following type of protection with mounted
mating connector:
▶ IP67 (DIN/EN 60529) and
▶ IP69K (DIN 40050-9)
▼ Circuit symbol
▼ Mating connector DEUTSCH DT06-2S-EP04
Consisting of DT designation
1 housing DT06-2S-EP04
1 wedge W2S
2 sockets 0462-201-16141
The mating connector is not included in the scope of deliv-
ery. This can be supplied by Bosch Rexroth on request
(material number R902601804).
Note
▶ If necessary, you can change the connector orientation
by turning the solenoid housing.
▶ Refer to the instruction manual for the procedure.
Installation dimensions for coupling assembly
To ensure that rotating components (coupling hub) and
fixed components (housing, snap ring) do not come into
contact with each other, the installation conditions
described here must be observed. This depends on the
size and the splined shaft.
SAE splined shaft (spline according to ANSI B92.1a)
The outer diameter of the coupling hub must be smaller
than the inner diameter of the snap ring (dimension d
2
) in
the area near the drive shaft collar (dimension x
2
– x
3
).
Please observe diameter d
5
of the free turning.
9.5
−0.5
4.3
8
−0.6
7
101.6
63
±0.1
80
51.4
40
Coupling hub
approx.
min.
Bosch Rexroth AG, RE 93221/05.2014
24 A22VG series 40 | Axial piston variable double pump
Installation instructions
Installation instructions
General
During commissioning and operation, the axial piston unit
must be filled with hydraulic fluid and air bled. This must
also observed following a relatively long standstill as the
axial piston unit may drain back to the reservoir via the
hydraulic lines.
The leakage in the housing must be directed to the reser-
voir via the highest drain port T.
For combinations of multiple units, the leakage must be
drained at each pump. If a shared drain line is used for this
purpose, make certain that the respective case pressure is
not exceeded. In the event of pressure differences at the
drain ports of the units, the shared drain line must be
changed so that the minimum permissible case pressure of
all connected units is not exceeded in any situation. If this
is not possible, separate drain lines must be laid if neces-
sary.
To achieve favorable noise values, decouple all connecting
lines using elastic elements and avoid above-reservoir
installation.
In all operating conditions, the suction and drain lines must
flow into the reservoir below the minimum fluid level. The
permissible suction height h
S
results from the overall loss
of pressure; it must not, however, be higher than
h
Smax
=800 mm. The minimum suction pressure at port S
must also not fall below 0.8bar absolute during operation
(cold start 0.5bar absolute).
When designing the reservoir, ensure adequate space
between the suction line and the drain line. This prevents
the heated, return flow from being drawn directly back
into the suction line.
Installation position
See the following examples 1 to 4.
Further installation positions are possible upon request.
Notes
▶ If it is not possible to fill the stroking chambers via X
1
to X
4
in the final installation position, this must be
done prior to installation.
▶ To prevent unexpected actuation and damage, the
stroking chambers must be air bled via ports X
1
, X
2
or
X
3
,X
4
depending on the installation position.
▶ For HT control, X
1
, X
2
are not present and are replaced
by X
5
, X
6
.
▶ In certain installation positions, an influence on the
control characteristics can be expected. Gravity, dead
weight and case pressure can cause minor shifts in
control characteristics and changes in response time.
Key
L Filling / air bleed
R Air bleed port
S Suction port
T Drain port
SB Baffle (baffle plate)
h
t min
Minimum required immersion depth (200 mm)
h
min
Minimum required distance to reservoirbottom(100mm)
h
S max
Maximum permissible suction height (800mm)
RE 93221/05.2014, Bosch Rexroth AG
Axial piston variable double pump | A22VG series 40
Installation instructions
25
Below-reservoir installation (standard)
Below-reservoir installation means that the axial piston unit
is installed outside of the reservoir below the minimum
fluid level.
Installation position Air bleed
the
housing
Air bleed
the stroking
chamber
Filling
1 Without boost pump R X
1
, X
2
T
+ X
1
+ X
2
T
h
t min
h
min
X
1
, X
2,
R R, X
1
, X
2
SB
2 Without boost pump – – T
T
h
t min
h
min
SB
3 With boost pump R X
1
, X
2
S + T
+ X
1
+ X
2
T
SB
S
X
1
, X
2,
R
R, X
1
, X
2
h
t min
h
min
4 With boost pump – – S + T
T
SB
S
h
t min
h
min
Above-reservoir installation
Above-reservoir installation means that the axial piston unit
is installed above the minimum fluid level of the reservoir.
Observe the maximum permissible suction height
h
S max
= 800 mm.
Installation position Air bleed
the
housing
Air bleed
the stroking
chamber
Filling
5 Without boost pump R X
1
, X
2
L
1
+ X
1
+ X
2
h
t min
h
min
L
1
SB
X
1
, X
2,
R R, X
1
, X
2
T
6 Without boost pump L
1
– L
1
h
t min
h
min
L
1
SB
T
7 With boost pump R + L
2
(S) X
1
, X
2
L
1
+ L
2
(S) + X
1
+ X
2
SB
h
t min
h
min
h
S max
T
S
L
2
X
1
, X
2,
R
R, X
1
, X
2
L
1
8 With boost pump L
1
+ L
2
(S) – L
1
+ L
2
(S)
SB
h
t min
h
min
h
S max
T
S
L
2
L
1
For legend and notes, see page 24.
26
Bosch Rexroth AG, RE 93221/05.2014
Bosch Rexroth Corporation
Mobile Applications
8 Southchase Court
Fountain Inn, SC 29644-9018, USA
Telephone (864) 967-2777
Facsimile (864) 967-8900
www.boschrexroth-us.com
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent. The data specified
above only serve to describe the product. No statements concerning a
certain condition or suitability for a certain application can be derived from
our information. The information given does not release the user from the
obligation of own judgment and verification. It must be remembered that our
products are subject to a natural process of wear and aging.
A22VG series 40 | Axial piston variable double pump
Project planning notes
Project planning notes
▶ The pump A22VG is designed to be used in closed circuit.
▶ The project planning, installation and commissioning of
the axial piston unit requires the involvement of quali-
fied skilled person.
▶ Before using the axial piston unit, please read the corre-
sponding instruction manual completely and thoroughly.
If necessary, these can be requested from Bosch
Rexroth.
▶ Before finalizing your design, request a binding installa-
tion drawing.
▶ The data and notes contained herein must be adhered
to.
▶ Depending on the operating conditions of the axial
piston unit (operating pressure, fluid temperature),
the characteristic curve may shift.
▶ Not all variants of the product are approved for use in
safety functions according to ISO13849. Please consult
the responsible contact person at Bosch Rexroth if you
require reliability parameters (e.g. MTTF
d
) for functional
safety.
▶ Working ports:
– The ports and fastening threads are designed for the
specified maximum pressure. The machine or system
manufacturer must ensure that the connecting ele-
ments and lines correspond to the specified applica-
tion conditions (pressure, flow, hydraulic fluid, tem-
perature) with the necessary safety factors.
– The working ports and function ports can only be
used to accommodate hydraulic lines.
Safety instructions
▶ During and shortly after operation, there is a risk of
burns on the axial piston unit and especially on the
solenoids. Take appropriate safety measures (e.g. by
wearing protective clothing).
▶ Moving parts in control and regulation systems (e.g.
valve spools) may in certain circumstances become
stuck in an undefined position due to contamination
(e.g. contaminated hydraulic fluid, abrasion or residual
dirt from components). As a result, the hydraulic fluid
flow or build-up of torque of the axial piston unit will no
longer respond correctly to the operator’s commands.
Even the use of different filter cartridges (external or
internal inlet filter) will not rule out a fault but merely
minimize the risk. The machine/system manufacturer
must test whether remedial measures are needed on the
machine for the application concerned in order to set
the consumer being driven to a safe position (e.g. safe
stop) and if necessary to ensure it is properly imple-
mented.