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A1VO series 10

  • For load-sensing systems in smaller mobile machines

  • Size 18 … 35

  • Nominal pressure 250 bar

  • Maximum pressure 280 bar

  • Open circuit
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Features
Type Code
Technical Data
Dimension
Design Notes
Safety
  • Significant fuel savings up to 15% compared to constant systems

  • Optimized efficiency, though same power at less fuel consumption

  • Increased service life compared to gear pumps

  • Compact design by integrated controller

  • A wide range of highly adaptable control devices for all important applications

  • Stepless flow variation by adjusting the swashplate angle.

  • Low operating noise

  • High power density

  • Excellent suction characteristics

  • High flexibility through interchangeable through drive adapters

  • Swashplate design


Notice

  • Observe the information in the project planning notes chapter
  • Observe the project planning notes regarding each control device
  • In addition to the type code, please specify the relevant technical data when placing your order

Table of values

Size

18 28 35

Displacement
geometric, per revolution

Vg max

cm³

18 28 35

Vg min

cm³

0 0 0

Nominal pressure

pnom

bar

250 250 250

Maximum pressure

pmax

bar

280 280 280

Maximum speed 1) 2)

with Vg max

nnom

rpm

3300 3200 3000

Flow

at Vg max and nnom

qV

l/min

59 89 105

Power

at qV nom and pnom

P

kW

25 37 44

Torque

at Vg max and pnom

M

Nm

72 111 139

Rotary stiffness

S3, 3/4 in 11T 16/32DP

c

kNm/rad

9.78 9.78 -

S4, 7/8 in 13T 16/32DP

c

kNm/rad

12.88 12.88 18.6

S5, 1 in 15T 16/32DP

c

kNm/rad

- - 22.9

P3, 20 mm

c

kNm/rad

16.49 16.49 -

K3, 19.05 mm

c

kNm/rad

17.27 17.27 -

Moment of inertia for rotary group

JTW

kg·m²

0.000686 0.00737 0.00159

Maximum angular acceleration 3)

ɑ

rad/s²

6800 5500 5000

Case volume

V

l

0.5 0.5 0.6

Weight without through drive

m

kg

12.3 12.3 18.4

Weight with through drive

m

kg

13.5 13.5 19.8

Determining the operating characteristics

Flow

[l/min]

Torque

[Nm]

Power

[kW]

Key

Vg

Displacement per revolution [cm3]

Δp

Differential pressure [bar]

n

Rotational speed [rpm]

ηv

Volumetric efficiency

ηhm

Hydraulic-mechanical efficiency

ηt

Total efficiency (ηt = ηv • ηhm)

Notice

  • The table values are theoretical values without consideration of efficiencies and tolerances. The values are 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 testing the loads by means of experiment or calculation / simulation and comparison with the permissible values.


Hydraulic fluid

The axial piston unit is designed for operation with HLP mineral oil according to DIN 51524. See the following data sheet for application instructions and requirements for selecting hydraulic fluid, behavior during operation as well as disposal and environmental protection before you begin project planning:

Selection of hydraulic fluid

Bosch Rexroth evaluates hydraulic fluids on the basis of the Fluid Rating according to the technical data sheet 90235.

Hydraulic fluids with positive evaluation in the Fluid Rating are provided in the following technical data sheet:

The hydraulic fluid should be selected so that the operating viscosity in the operating temperature range is within the optimum range (νopt; see selection diagram).

Viscosity and temperature of hydraulic fluids


Viscosity

Shaft seal

Temperature1)

Comment

Cold start

νmax ≤ 1600 mm²/s

FKM

ϑSt ≥ -25 °C

t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 rpm,
permissible temperature difference between axial piston unit and hydraulic fluid max. 25 K

Warm-up phase

ν = 400 … 1600 mm²/s

t ≤ 15 min, p ≤ 0.7 • pnom and n ≤ 0.5 • nnom

Continuous operation

ν = 10 … 400 mm²/s2)

FKM

ϑ ≤ +90 °C

measured at port L

νopt = 16 … 36 mm²/s

range of optimum operating viscosity and efficiency

Short-term operation

νmin = 7 … 10 mm²/s

FKM

ϑ ≤ +90 °C

t ≤ 1 min, p ≤ 0.3 • pnommeasured at port L


Notice

The axial piston unit is not suitable for operation with water-free HF hydraulic fluids / HF hydraulic fluids containing water / HFx hydraulic fluids.

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.

At a hydraulic fluid viscosity of less than 10 mm²/s (e.g. due to high temperatures in short-term operation) at the drain port, a cleanliness level of at least 19/17/14 according to ISO 4406 is required.

For example, the viscosity is 10 mm²/s at:

  • HLP 32 a temperature of 73°C
  • HLP 46 a temperature of 85°C

Operating pressure range

Pressure at working port B

Definition

Nominal pressure

pnom

250 bar

The nominal pressure corresponds to the maximum design pressure.

Maximum pressure

pmax

280 bar

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

0.05 s

      Total operating period

14 h

Minimum pressure

pB abs

14 bar1)

Minimum pressure on the high-pressure side (port B) which is required in order to prevent damage to the axial piston unit.

Rate of pressure change

RA max

16000 bar/s

Maximum permissible rate of pressure build-up and reduction during a pressure change over the entire pressure range.

Pressure at suction port S (inlet)

Definition

Minimum pressure

pS min

0.8 bar absolute

Minimum pressure at inlet (suction port S) which is required to prevent damage to the axial piston unit. The minimum pressure depends on the rotational speed and the displacement of the axial piston unit.

Maximum pressure

pS max

5 bar abs.

Case pressure at port L1, L2

Definition

Maximum pressure

pL max

2 bar

Maximum 0.5 bar higher than inlet pressure at port S, however not higher than pL max.
A drain line to the reservoir is required.


Pressure definition


Rate of pressure change

Notice

  • Working pressure range applies when using mineral oil-based hydraulic fluids. Please contact us for values for other hydraulic fluids.
  • In addition to the hydraulic fluid and the temperature, the service life of the shaft seal is influenced by the rotational speed of the axial piston unit and the case pressure.
  • The case pressure must be greater than the ambient pressure.

Permissible radial and axial forces of the drive shaft

Size

18 28 35

Maximum radial force
at distance a = x/2
(from shaft collar)

Fq max

N

150 150 650

Maximum axial force

± Fax max

N

400 400 650

Torque at 1st pump

M1

Torque at 2nd pump

M2

Torque at 3rd pump

M3

Input torque

ME = M1+M2+M3

ME < ME max

Through-drive torque

MD = M2+M3

MD < MD max

Distribution of torques

Permissible input and through-drive torques

Size

18 28 35

Maximum input torque at the drive shaft
(valid for drive shafts free of radial force)

S3, 3/4 in 11T 16/32DP

ME max

Nm

143 143 -

S4, 7/8 in 13T 16/32DP

ME max

Nm

198 198 198

S5, 1 in 15T 16/32DP

ME max

Nm

- - 319

P3, 20 mm

ME max

Nm

151 151 -

K3, 19.05 mm

ME max

Nm

147 147 -

Maximum through-drive torque

S3, 3/4 in 11T 16/32DP

MD max

Nm

87 87 -

S4, 7/8 in 13T 16/32DP

MD max

Nm

87 87 139

S5, 1 in 15T 16/32DP

MD max

Nm

- - 139

Notice

The values given are maximum values and do not apply to continuous operation. All shaft loads reduce the bearing service life!

Sizes 18 and 28

Dimensions, sizes 18 and 28
DR, DN - Pressure controller
DRS0, DNS0 - Pressure controller with load-sensing,
Clockwise rotation

1) Center of gravity
2) Connection surfaces S, B, X, L1 and L2 with port plate 9
3) Only at port plate 9 and L2 closed

Sizes 18 and 28

DR, DN - Pressure controller
DRS0, DNS0 - Pressure controller with load-sensing,
Counter-clockwise rotation


Splined shaft SAE J744


Keyed shaft

D3/D4 Pressure controller with override, electric-proportional

Ports and fastening threads version "B"

Size

18 28

B

Working port

Size

1 5/16 in -12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (must be connected)

S

Suction port

Size

1 5/8 in 12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (must be connected)

L1

Drain port

Size

3/4 in 16UNF-2B; 15 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (observe installation instructions)

L2

Drain port

Size

3/4 in 16UNF-2B; 15 mm deep

Standard 1)

ISO 11926

State on delivery

Plugged (observe installation instructions)

X

Pilot signal

Size

7/16 in 20UNF-2B; 12 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (must be connected)

Ports and fastening threads version "M"

Size

18 28

B

Working port

Size

M33 × 2; 19 mm deep

Standard 1)

ISO 6149

State on delivery

With protective cover (must be connected)

S

Suction port

Size

M42 × 2; 19.5 mm deep

Standard 1)

ISO 6149

State on delivery

With protective cover (must be connected)

L1

Drain port

Size

M18 × 1.5; 14.5 mm deep

Standard 1)

ISO 6149

State on delivery

With protective cover (observe installation instructions)

L2

Drain port

Size

M18 × 1.5; 14.5 mm deep

Standard 1)

ISO 6149

State on delivery

Plugged (observe installation instructions)

X

Pilot signal

Size

M12 × 1.5; 11.5 mm deep

Standard 1)

ISO 6149

State on delivery 2)

With protective cover (must be connected)
1) The spot face can be deeper than specified in the appropriate standard.
2) Only with SO controller.

Size 35

Dimensions, sizes 18 and 28
DR, DN - Pressure controller
DRS0, DNS0 - Pressure controller with load-sensing,
Clockwise rotation


Size 35

DR, DN - Pressure controller
DRS0, DNS0 - Pressure controller with load-sensing,
Counter-clockwise rotation


Splined shaft SAE J744


D3/D4 Pressure controller with override, electric-proportional

Ports and fastening threads version "B"

Size

35

B

Working port

Size

1 5/16 in -12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (must be connected)

S

Suction port

Size

1 5/8 in 12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (must be connected)

L1

Drain port

Size

3/4 in 16UNF-2B; 15 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (observe installation instructions)

L2

Drain port

Size

3/4 in 16UNF-2B; 15 mm deep

Standard 1)

ISO 11926

State on delivery

Plugged (observe installation instructions)

X

Pilot signal

Size

7/16 in 20UNF-2B; 12 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (must be connected)

Ports and fastening threads version "M"

Size

35

B

Working port

Size

M33 × 2; 20 mm deep

Standard 1)

ISO 6149

State on delivery

With protective cover (must be connected)

S

Suction port

Size

M42 × 2; 20 mm deep

Standard 1)

ISO 6149

State on delivery

With protective cover (must be connected)

L1

Drain port

Size

M18 × 1.5; 13 mm deep

Standard 1)

ISO 6149

State on delivery

With protective cover (observe installation instructions)

L2

Drain port

Size

M18 × 1.5; 13 mm deep

Standard 1)

ISO 6149

State on delivery

Plugged (observe installation instructions)

X

Pilot signal

Size

M12 × 1.5; 12 mm deep

Standard 1)

ISO 6149

State on delivery 2)

With protective cover (must be connected)

Notice:

At all ports - in particular when connecting port S - use the stud ends provided for the standard with the corresponding width across flats. Please contact us about larger widths across flats.


Dimensions for through drives

Flange SAE J744

Diameter


Mounting2)


Designation

Hub for splined shaft1)

Diameter


Designation


18


28


35

Code

82-2 (A)

A2

5/8 in

9T 16/32DP

S2

A2S2

3/4 in

11T 16/32DP

S3

A2S3

7/8 in

13T 16/32DP

S4

A2S4

101-2 (B)

B2

7/8 in

13T 16/32DP

S4

B2S4

1 in

15T 16/32DP

S5

-

-

B2S5


2-bolt flange ⌀82.55 mm, SAE J744 82-2 (A)


Code

Size

D1

D2 1)


mm

mm

A2S2 18 203.2 31
28 203.2 31
35 227.6 31
A2S3 18 203.2 37
28 203.2 37
35 227.6 37
A2S4 18 203.2 40
28 203.2 40
35 227.6 40

2-bolt flange ⌀101.6mm, SAE J744 101-2 (B)


Code

Size

D1

D2 1)


mm

mm

B2S4 18 203.2 40
28 203.2 40
35 227.6 40
B2S5 35 227.6 45

Overview of mounting options

Through drive

Mounting option - 2nd pump

Flange

Hub for splined shaft

Code

A1VO/10
NG (shaft)

A4VG/32
NG (shaft)

A10VG/10
NG (shaft)

A10VO/52/53
NG (shaft)

A10VNO/52/53
NG (shaft)

A10V(S)O/31
NG (shaft)

External gear pumps

82-2 (A)

5/8 in

A2S2

18, 28 (S2)

-

-

10 (U),
18 (U)

-

18 (U)

AZPF

3/4 in

A2S3

18, 28 (S3)

-

-

10 (S),
18 (S, R)

28 (R)

18 (S, R)

-

7/8 in

A2S4

18, 28 (S4)

-

-

-

-

-

-

101-2 (B)

7/8 in

B2S4

18, 28 (S4)
35 (S4)

-

18 (S)

28 (S, R)

-

28 (S, R)

AZPN
AZPG

1 in

B2S5

35 (S5)

28 (S)

28 (S)

-

-

-

-

1) Additional through drives are available on request

Combination pumps A1VO + A1VO

By using combination pumps, it is possible to have independent circuits without the need for splitter gearboxes.

When ordering combination pumps, the type designations of the 1st and 2nd pumps must be linked by a "+".

Order example:

A1VO035DRS0C200/10BRVB2S51B2S500-0+

A1VO035DRS0C200/10BRVB2S51000000-0

A tandem pump, with two pumps of equal size, is permissible without additional supports, assuming that the dynamic mass acceleration does not exceed a maximum of 10 g (= 98.1 m/s2).

For combination pumps consisting of more than two pumps, the mounting flange must be calculated for the permissible mass torque.


m1, m2

Weight of pump

[kg]

l1, l2

Distance from center of gravity

[mm]

Tm=(m1 + l1 + m2 + l2 + ....) x

1

[Nm]

102

Total length A

Size

NG18

NG28

NG35

mm

mm

mm

18 383 - -
28 383 383 -
35 410 410 431

Permissible moments of inertia

Size

18 28 35

Static mass torque

Mm

Nm

500 500 500

Dynamic mass torque at 10 g (98.1 m/s2)

Mm

Nm

50 50 50

Weight without through drive

m

kg

12.3 12.3 18.4

Weight with through drive

m

kg

13.5 13.5 19.8

Distance, center of gravity without through drive

l1

mm

87 87 100

Distance, center of gravity with through drive

l1

mm

97 97 108

Installation instructions

General

The axial piston unit must be filled with hydraulic fluid and air bled during commissioning and operation. This must also be observed following a longer standstill as the axial piston unit may empty via the hydraulic lines.
Particularly in installation position "Drive shaft upwards/downwards", complete filling and air bleeding must be ensured as there is for example a risk of dry running.
The leakage in the housing area must be drained via the highest leakage port (L1, L2) to the reservoir.
In case of combinations of several units, draining of leakage is required at all pumps.
If one common drain line is used for several units, it must be ensured that the respective case pressure is not exceeded. The shared drain line must be dimensioned to ensure that the maximum permissible case pressure of all connected units is not exceeded in any operating conditions, particularly at cold start. If this is not possible, separate drain lines must be laid, if necessary.
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 hS is derived from the total pressure loss. However, hS max = 800 mm must not be exceeded. The minimum suction pressure at port S must also not fall below 0.8 bar abs. during operation and during a cold start.
Make sure to provide adequate distance between suction line and drain line for the reservoir design. This prevents the heated return flow from being drawn directly back into the suction line.


Notice

  • Port F is part of the external piping and must be provided on the customer side to make filling and air bleeding easier.
  • In certain installation positions, an influence on the adjustment or control can be expected.
    Gravity, dead weight and case pressure can cause minor characteristic shifts and changes in actuating time.


Installation position

See the following examples 1 to 11.
Further installation positions are available upon request.
Installation positions 1 and 2 are recommended.

Below-reservoir installation (standard)

Below-reservoir installation is when the axial piston unit is installed outside of the reservoir below the minimum fluid level.


Installation position

Air bleeding

Filling

1

F, L1

F, L1

2

F, L2

F, L2

3

F, L1 or L2

F, L1 or L2

4

F, L1 or L2

F, L1 or L2

Above-reservoir installation

Above-reservoir installation means that the axial piston unit is installed above the minimum fluid level of the reservoir. To prevent the axial piston unit from draining, a height difference hES min of at least 25 mm is required in position 8. Observe the maximum permissible suction height hS max = 800 mm

Installation position

Air bleeding

Filling

5

F, L1

L1

6

F, L2

L2

7

F, L1

L1

8

F, L1

L1

Inside-reservoir installation

Inside-reservoir installation is when the axial piston unit is installed in the reservoir below the minimum fluid level.

The axial piston unit is completely below the hydraulic fluid.

If the minimum fluid level is equal to or below the upper edge of the pump, see chapter "Above-reservoir installation".

Axial piston units with electrical components (e.g. electric control, sensors) may not be installed in a reservoir below the fluid level.

1) Because complete air bleeding and filling are not possible in this position, the pump should be air bled and filled in a horizontal position before installation.

Installation position

Air bleeding

Filling

9

Via the highest available port L1

Automatically via the open port L1 due to the position under the hydraulic fluid level

10

Via the highest available port L2

Automatically via the open port L2 due to the position under the hydraulic fluid level

11

Via the highest available port L2

Automatically via the open port L2 due to the position under the hydraulic fluid level

Key

F

Filling / Air bleeding

L1, L2, L4

Drain port

S

Suction port

SB

Baffle (baffle plate)

ht min

Minimum required immersion depth (200 mm)

hmin

Minimum required spacing to reservoir bottom (100 mm)

hS max

Maximum permissible suction height (800 mm)

Project planning notes

  • The axial piston unit is designed to be used in open circuits.
  • The project planning, assembly and commissioning of the axial piston unit require the involvement of qualified skilled persons.
  • Before using the axial piston unit, please read the corresponding instruction manual completely and thoroughly. If necessary, this can be requested from Bosch Rexroth.
  • Before finalizing your design, please request a binding installation drawing.
  • The specified data and notes contained herein must be observed.
  • Depending on the operating conditions of the axial piston unit (working pressure, fluid temperature), the characteristic curve may shift.
  • The characteristic curve may also shift due to the dither frequency or control electronics.
  • Preservation: Our axial piston units are supplied as standard with preservative protection for a maximum of 12 months. If longer preservation is required (maximum 24 months), please specify this in plain text when placing your order. The preservation periods apply under optimal storage conditions, which can be found in data sheet 90312 or in the instruction manual.
  • Not all versions of the product are approved for use in a safety function according to ISO 13849. Please consult the proper contact at Bosch Rexroth if you require reliability parameters (e.g. MTTFd) for functional safety.
  • Depending on the type of control used, electromagnetic effects can be produced when using solenoids. Use of the recommended direct current (DC) on the electromagnet does not produce any electromagnetic interference (EMI) nor is the electromagnet influenced by EMI. Potential electromagnetic interference (EMI) exists if the solenoid is energized with a modulated direct current (e.g. PWM signal). The machine manufacturer should conduct appropriate tests and take appropriate measures to ensure that other components or operators (e.g. with a pacemaker) are not affected by this potentiality.
  • Pressure controllers are no safeguards against pressure overload. Be sure to add a pressure relief valve to the hydraulic system.
  • For drives that are operated for a long period with constant rotational speed, the natural frequency of the hydraulic system can be stimulated by the excitation frequency of the pump (rotational speed frequency ×9). This can be prevented with suitably designed hydraulic lines.
  • Please note the details regarding the tightening torques of port threads and other threaded joints in the instruction manual.
  • The ports and fastening threads are designed for the specified maximum pressure. The machine or system manufacturer must ensure the connecting elements and lines correspond to the specified application conditions (pressure, flow, hydraulic fluid, temperature) with the necessary safety factors.
  • The working ports and function ports are only intended 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 the appropriate safety measures (e.g. by wearing protective clothing).
  • Moving parts in control equipment (e.g. valve spools) can, under certain circumstances, get stuck in an undefined position as a result of contamination (e.g. contaminated hydraulic fluid, abrasion, or residual dirt from components). As a result, the hydraulic fluid flow and the build-up of torque in the axial piston unit can no longer respond correctly to the operator’s specifications. Even the use of various filter elements (external or internal flow filtration) will not rule out a fault but merely reduce the risk. The machine/system manufacturer must test whether remedial measures are needed on the machine for the application concerned in order to bring the driven consumer into a safe position (e.g. safe stop) and ensure any measures are properly implemented.
Application scenarios