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Description
- For load-sensing systems in smaller mobile machines
- Size 18 … 35
- Nominal pressure 250 bar
- Maximum pressure 280 bar
- Open circuit
Features
- 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
Type code
| 1) | Connectors for other electric components may differ |
| 1) | For size 35, not for through drive |
| 2) | Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5 |
| 3) | Mounting drillings pattern viewed on through drive, with service line port B on right |
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
Technical data
Table of values
| Size | 18 | 28 | 35 | |||
| Displacement | 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 | 00686 | 0737 | 0159 | |
| 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 | |
| 1) | The values are applicable: – at an abs. pressure pabs = 1 bar at the suction port S – for the optimum viscosity range of vopt = 36 to 16 mm2/s - with hydraulic fluid on the basis of mineral oils |
| 2) | For a pressure of <1 bar at the suction port S, please contact us. |
| 3) | The data are valid for values between the minimum required and maximum permissible rotational speed. It applies for external stimuli (e.g. diesel engine 2 to 8 times rotary frequency, cardan shaft twice the rotary frequency). The limit value is only valid for a single pump. The load capacity of the connection parts must be considered. |
| 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:
- 90220:Hydraulic fluids based on mineral oils and related hydrocarbons
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:
- 90245: Bosch Rexroth Fluid Rating List for Rexroth hydraulic components (pumps and motors)
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, |
| 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 |
| 1) | If the specified temperatures cannot be maintained due to extreme operating parameters, please contact us. |
| 2) | Equates e.g. with the VG 46 a temperature range of +5 °C to +85 °C (see selection diagram) |
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. |
| 1) | Please contact us about lower pressures |
Pressure definition
| 1) | Total operating period = t1 + t2 + ... + tn |
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 |  | 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 | 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!
Controllers/adjustment devices
DR/DN – Pressure controller
The pressure controller limits the maximum pressure at the pump outlet within the control range of the variable pump. The variable pump only supplies as much hydraulic fluid as is required by the consumers. If the working pressure exceeds the pressure command value at the pressure valve, the pump will regulate to a smaller displacement to reduce the control differential.
- Basic position in depressurized state: Vg max
Permissible setting range for pressure control
- DR:100 to 250 bar.
Standard is 250 bar
- DN: 20 to 100 bar.
Standard is 100 bar
Notice
In order to prevent damage to the pump and the system, the permissible setting range must not be exceeded.
Lower values on request.
Controller data
Hysteresis and repeatability Δp: maximum 5 bar
Pilot fluid consumption: maximum approx. 3 l/min
Characteristic curve DR
Circuit diagram DR
DRS0/DNS0 – Pressure controller
In addition to the pressure controller function (DR), the load-sensing controller works as load pressure guided flow controller and adjusts the displacement of the pump to the quantity required by the consumer. The load-sensing controller compares the pressure upstream the metering orifice to the one downstream the orifice and keeps the pressure drop (differential pressure ∆p) occurring here and thus the flow constant.
The swinging in by the pressure or the flow controller always takes priority.
Permissible setting range for pressure control
- DRS0: 100 to 250 bar.
- DNS0: 20 to 100 bar.
Notice
- In order to prevent damage to the pump and the system, the permissible setting range must not be exceeded. Lower values on request.
- Version DRS0/DNSO does not have any connection from X to the reservoir; thus, the LS must be unloaded in the system.
Differential pressure Δp
Standard setting: 14 bar. If another setting is required, please state in the plain text.
Controller data
Data for the DR pressure controller, see description DR/DN. Maximum flow deviation (hysteresis and increase) measured at drive speed n= 1500 rpm and tfluid= 50 °C
Flow deviation ΔqV max: 3 l/min
Pilot fluid consumption: maximum approx. 4 l/min
Characteristic curve DRS0
Circuit diagram DRS0
1 Die Messblende (Steuerblock) ist nicht im Lieferumfang enthalten
Characteristic curve at variable rotational speed
D3/D4 – Pressure controller with override
With the electric pressure adjustment with proportional solenoid, the high pressure can be continuously set depending on the solenoid current. If the load pressure at the consumer changes, the delivery rate of the pump is adjusted so that the specified pressure is reached again. If the solenoid current falls below the beginning of control, the unit will switch to the set maximum pressure. The same is true if the pilot signal is lost.
Current/pressure characteristic curve (negative characteristic curve)
Characteristic curve measured with pump in zero stroke
Further information on request.
Electrical connection
Dimensions
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
| 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 |
Splined shaft SAE J744
| 1) | Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5 |
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) | |||
| 1) | The spot face can be deeper than specified in the appropriate standard. |
| 2) | Only with SO controller. |
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
| 1) | Center of gravity |
Size 35
DR, DN - Pressure controller
DRS0, DNS0 - Pressure controller with load-sensing,
Counter-clockwise rotation
| 1) | Center of gravity |
Splined shaft SAE J744
| 1) | Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5 |
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) | ||
| 1) | The spot face can be deeper than specified in the appropriate standard. |
| 2) | Only with SO controller. |
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) | ||
| 1) | The spot face can be deeper than specified in the appropriate standard. |
| 2) | Only with SO controller. |
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 |
|
|
| 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 | |||
| 1) | Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5 |
| 2) | Mounting drillings pattern viewed on through drive, with service line port B on right |
2-bolt flange ⌀82.55 mm, SAE J744 82-2 (A)
| 1) | Continuous thread according to DIN 13. For maximum tightening torques, see instruction manual. |
| 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 |
| 1) | Wave length for pumps with mounting flanges according to ISO 3019-1 |
2-bolt flange ⌀101.6mm, SAE J744 101-2 (B)
| 1) | Continuous thread according to DIN 13. For maximum tightening torques, see instruction manual. |
| 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 |
| 1) | Wave length for pumps with mounting flanges according to ISO 3019-1 |
Overview of mounting options
| Through drive | Mounting option - 2nd pump | ||||||||
| Flange | Hub for splined shaft | Code | A1VO/10 | A4VG/32 | A10VG/10 | A10VO/52/53 | A10VNO/52/53 | A10V(S)O/31 | External gear pumps |
| 82-2 (A) | 5/8 in | A2S2 | 18, 28 (S2) | - | - | 10 (U), | - | 18 (U) | AZPF |
| 3/4 in | A2S3 | 18, 28 (S3) | - | - | 10 (S), | 28 (R) | 18 (S, R) | - | |
| 7/8 in | A2S4 | 18, 28 (S4) | - | - | - | - | - | - | |
| 101-2 (B) | 7/8 in | B2S4 | 18, 28 (S4) | - | 18 (S) | 28 (S, R) | - | 28 (S, R) | AZPN |
| 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 | |
Project planning information
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.
| 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 |
| 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
| 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 |
| 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
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.
Ordering codes
Downloads
 | Axialkolben-Verstellpumpe A1VO Baureihe 10 Data Sheet | RD92650 | 2020-03-03 | German | PDF | 1.3MB Product Groups: Variable pumps, open circuit, Variable pumps, open circuit |
| Axial Piston Variable Pump A1VO Series 10 Data Sheet | RE92650 | 2020-03-03 | English | PDF | 1.3MB Product Groups: Variable pumps, open circuit, Variable pumps, open circuit |
| Axialkolben-Verstellpumpe A1VO Baureihe 10 Manual | RD92650-01-B | 2012-06-01 | German | PDF | 2.1MB Product Groups: Pumps, Variable pumps, open circuit Betriebsanleitung |
| Axial Piston Variable Pump A1VO Series 10 Manual | RE92650-01-B | 2012-06-01 | English | PDF | 2.1MB Product Groups: Pumps, Variable pumps, open circuit Instruction manual |
| A1VO Fact Sheet | RE98701 | 2015-09-30 | English | PDF | 711k Product Groups: A1VO A1VO axial piston variable pump |
| A1VO Fact Sheet | RC98701 | 2014-04-30 | Chinese | PDF | 960k Product Groups: A1VO 轴向柱塞变量泵 |
| A1VO Fact Sheet | R-RS98701 | 2015-09-30 | Russian | PDF | 1MB Product Groups: A1VO Аксиально-поршневой регулируемый насос |
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