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R902021574  A2FO12/61L-PZP06 Rexroth A2FO Series Axial Piston Pump R902021574  A2FO12/61L-PZP06 Rexroth A2FO Series Axial Piston Pump

R902021574 A2FO12/61L-PZP06 Rexroth A2FO Series Axial Piston Pump

R902021574 A2FO12/61L-PZP06 Technical data : Size 5 10 12 16 23 28 32 45 56 63 Displacement Vg cm³ 4.93...
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  • R902021574 A2FO12/61L-PZP06
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Product Description

R902021574 A2FO12/61L-PZP06 Technical data:

Size 5 10 12 16 23 28 32 45 56 63
Displacement Vg cm³ 4.93 10.3 12 16 22.9 28.1 32 45.6 56.1 63
geometric, per revolution
Nominal pressure pnom bar 315 400 400 400 400 400 400 400 400 400
Maximum pressure pmax bar 350 450 450 450 450 450 450 450 450 450
Maximum speed nnom 1) rpm 5600 3150 3150 3150 2500 2500 2500 2240 2000 2000
nmax 2) rpm 8000 6000 6000 6000 4750 4750 4750 4250 3750 3750
Flow at nnom qV l/min 27.6 32 38 50 57 70 80 102 112 126
Power at nnomand pnom P kW 14.5 22 25 34 38 47 53 68 75 84
Torque 3) at pnom M Nm 24.7 66 76 102 146 179 204 290 357 401
Rotary stiffness c kNm/rad 0.63 0.92 1.25 1.59 2.56 2.93 3.12 4.18 5.94 6.25
Moment of inertia for rotary group JTW kg·m² 0.00006 0.0004 0.0004 0.0004 0.0012 0.0012 0.0012 0.0024 0.0042 0.0042
Maximum angular acceleration ɑ rad/s² 5000 5000 5000 5000 6500 6500 6500 14600 7500 7500
Case volume V l 0.17 0.17 0.17 0.2 0.2 0.2 0.33 0.45 0.45
Weight (approx.) m kg 2.5 6 6 6 9.5 9.5 9.5 13.5 18 18

Maximum speed

1) These values are valid at:
- an absolute pressure of pabs = 1 bar at suction port S
- for the optimum viscosity range from vopt = 36 to 16 mm2/s
- with hydraulic fluid based on mineral oils
2) Maximum speed (limiting speed) with increased inlet pressure pabs at suction port S, see the following diagram.
3) Torque without radial force, with radial force see table "Permissible radial and axial forces of the drive shafts

Note

  • The values in the table are theoretical values, without consideration of efficiencies and tolerances. The values are rounded.
  • Exceeding the maximum or falling below the minimum permissible values can lead to a loss of function, a reduction in operational service life or total destruction of the axial piston unit. Other permissible limit values, such as speed variation, reduced angular acceleration as a function of the frequency and the permissible angular acceleration at start (lower than the maximum angular acceleration) can be CONTACT US.

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)

Hydraulic fluids

The axial piston unit is designed for operation with mineral oil HLP according to DIN 51524.

Application instructions 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)
90223: Fire-resistan, water-containing hydraulic fluids (HFAE, HFAS, HFB, HFC)
90225: Restricted technical data for operation with fire-resistant hydraulic fluids

Viscosity and temperature of hydraulic fluids

Viscosity

Shaft
seal

Temperature1)

Comment

Cold start

νmax ≤ 1600 mm²/s

NBR2)

ϑSt ≥ -40 °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

FKM

ϑSt ≥ -25 °C

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/s3)

NBR2)

ϑ ≤ +78 °C

measured at port T

FKM

ϑ ≤ +103 °C

νopt = 16 … 36 mm²/s

range of optimum operating viscosity and efficiency

Short-term operation

νmin = 7 … 10 mm²/s

NBR2)

ϑ ≤ +78 °C

t ≤ 3 min, p ≤ 0.3 • pnom

measured at port T

FKM

ϑ ≤ +103 °C

1) If the specified temperatures cannot be maintained due to extreme operating parameters, please contact us.
2) Special version, please contact us.
3) Equates e.g. with the VG 46 a temperature range of +5 °C to +85 °C (see selection diagram)

Explanatory note 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 (vopt see selection diagram).

Selection diagram

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 A or B (high-pressure side)

Definition

Nominal pressure

pnom

see table of values

The nominal pressure corresponds to the maximum design pressure.

Maximum pressure

pmax

see table of values

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

pHP min

25 bar

Minimum pressure on high-pressure side (port A or B) required 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) that is required to avoid damage to the axial piston unit. The minimum required pressure is dependent on the speed of the axial piston unit.
(see diagram "Maximum speed")

Maximum pressure

ps max

30 bar absolute

Case pressure at port T

Definition

Continuous differential pressure

ΔpT cont

2 bar

Maximum averaged differential pressure at the shaft seal (case to ambient)

Maximum differential pressure

ΔpT max

see diagram "Maximum differential pressure at the shaft seal"

Intermittent differential pressure at the shaft seal (permitted at reduced speed)

Pressure peaks

pT peak

10 bar

t

Note

  • Working pressure range valid when using hydraulic fluids based on mineral oils. Values for other hydraulic fluids, please contact us.

Pressure definition

1) Total operating period = t1 + t2 + ... + tn

Rate of pressure change

Maximum differential pressure at the shaft seal

Note

  • The service life of the shaft seal is influenced by the speed of the axial piston unit and the case pressure.
  • The service life decreases with an increase of the mean differential pressure between the case and the ambient pressure and with a higher frequency of pressure spikes.
  • The case pressure must be equal to or higher than the ambient pressure.

Direction of flow

Direction of rotation, viewed on drive shaft

clockwise

counter-clockwise

Direction of flow

S to B

S to A

Notes for sizes 250 ... 1000:

  • In case of radial forces limited performance data is valid. Please contact us.
  • In case of axial forces during operation of the unit please contact us.

Effect of radial force Fq on the service life of bearings

By selecting a suitable direction of radial force Fq the load on the bearings caused by the internal rotary group forces can be reduced, thus optimizing the service life of the bearings. Recommended position of mating gear is dependent on direction of rotation. Examples:

Toothed gear drive, size 5 … 180

Toothed gear drive, size 200 … 1000

1

Direction of rotation "clockwise", pressure at port B

2

Direction of rotation "counter-clockwise", pressure at port A

Long-life bearing

Size 250 to 1000

For long life cycle and use with HF hydraulic fluids. Identical external dimensions as design with standard bearing. Subsequent modification to long-life bearing is possible. Bearing and housing flushing via connection U is recommended.

Bearing flushing

Flushing flow (recommended)

Size

250 355 500 710 1000

Flushing flow qv

l/min

10 16 16 16 16

Leader Industrial Manufacture Co.,Limited. is a professional agent of foreign brand plunger pumps and hydraulic pumps. It mainly deals in Resroth,Yuken,Daikin,Nachi,Vickers,Sumitomo,Tokimec,Uhida,Yeoshe,Dension, and other European and American brands of original oil pumps, pump cores and accessories. Leader Industrial is committed to providing professional suppliers of hydraulic machinery equipment and accessories.It is widely used in injection moulding machine, die-casting machine, oil press, ship machinery, construction machinery, concrete pump truck, mixing truck, construction machinery, rotary drilling machine, bulldozer, loader, roller, paver, crane machinery, forklift, coal mine machinery, port machinery, oil field machinery and other heavy engineering machinery series.

If you are interested in our products, please feel free to contact us:info@ldhydraulic.com

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