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

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

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)

?St ≥ -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

?St ≥ -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)

? ≤ +78 °C

measured at port?T

FKM

? ≤ +103 °C

νopt = 16 … 36 mm2/s

? ?

range of optimum operating viscosity and efficiency

Short-term operation

νmin = 7 … 10 mm2/s

NBR2)

? ≤ +78 °C

t ≤ 3 min, p ≤ 0.3 ? pnom

measured at port?T

FKM

? ≤ +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

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

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