Table of values
|
Size
|
23
|
32
|
45
|
63
|
80
|
107
|
|
Displacement
geometric, per revolution
|
Vg
|
cm³
|
22.9
|
32
|
45.6
|
63
|
80.4
|
106.7
|
|
Nominal pressure
|
pnom
|
bar
|
350
|
350
|
350
|
350
|
350
|
350
|
|
Maximum pressure
|
pmax
|
bar
|
400
|
400
|
400
|
400
|
400
|
400
|
|
Maximum speed
|
nnom 1)
|
rpm
|
3050
|
2750
|
2650
|
2200
|
2150
|
2000
|
|
nmax 2)
|
rpm
|
4300
|
3900
|
3800
|
3200
|
3100
|
2800
|
|
Flow
|
at nnom
|
qV
|
l/min
|
70
|
88
|
121
|
139
|
173
|
213
|
|
Power
|
at nnom and pnom
|
P
|
kW
|
41
|
51
|
71
|
81
|
101
|
124
|
|
Torque
|
at pnom
|
M
|
Nm
|
127
|
178
|
254
|
351
|
448
|
594
|
|
Rotary stiffness
|
c
|
kNm/rad
|
2.56
|
3.12
|
4.18
|
6.25
|
8.73
|
11.2
|
|
Moment of inertia for rotary group
|
JTW
|
kg·m²
|
0.0012
|
0.0012
|
0.003
|
0.0042
|
0.0072
|
0.0116
|
|
Maximum angular acceleration
|
ɑ
|
rad/s²
|
6500
|
6500
|
14600
|
7500
|
6000
|
4500
|
|
Case volume
|
V
|
l
|
0.25
|
0.29
|
0.4
|
0.5
|
0.6
|
0.75
|
|
Mass moment
|
MG
|
Nm
|
4.7
|
4.7
|
8.6
|
9.9
|
15.3
|
20
|
|
Weight (approx.)
|
m
|
kg
|
5.9
|
5.9
|
8.4
|
9.3
|
12.3
|
15
|
|
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.
|
Maximum speed
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 found in
data sheet 90261.
|
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 fluid
The axial piston unit is designed for operation with HLP mineral oil 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)
The axial piston unit is not suitable for operation with water-containing HF hydraulic fluids.
For operation with HFD hydraulic fluids please note limitations regarding technical data. Please contact us.
Viscosity and temperature of hydraulic fluids
|
|
Viscosity
|
Temperature1)
|
Comment
|
|
Cold start
|
νmax ≤ 1600 mm²/s
|
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/s3)
|
ϑ ≤ +103 °C
|
measured at bleed port R
(ΔT = ca. 12 K between the bearing/shaft seal and port R)
|
|
νopt = 16 … 36 mm²/s
|
|
range of optimum operating viscosity and efficiency
|
|
Short-term operation
|
νmin = 7 … 10 mm²/s
|
ϑ ≤ +103 °C
|
t ≤ 3 min, p ≤ 0.3 • pnom
|
|
1)
|
If the specified temperatures cannot be maintained due to extreme operating parameters, please contact us.
|
|
2)
|
The FKM shaft seal may be used for case drain temperatures from -25 °C to +115 °C. For the temperature range below -25 °C, 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
|
350 bar
|
The nominal pressure corresponds to the maximum design pressure.
|
|
Maximum pressure
|
pmax
|
400 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
|
5 s
|
|
Total operating period
|
50 h
|
|
Minimum pressure
|
pHP min
|
10 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
|
9000 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
|
2 bar absolute
|
|
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
Permissible axial forces of the drive shaft
|
Size
|
23
|
32
|
45
|
63
|
80
|
107
|
|
Maximum axial force, when standstill or in non-pressurized conditions
|
|
+ Fax max
|
N
|
0
|
|
- Fax max
|
N
|
24
|
33
|
43
|
53
|
60
|
71
|
Notes
The values given are maximum values and do not apply to continuous operation. The axial force in direction Faxmust be avoided as this would reduce the bearing life service. Radial forces are not permissible.
Direction of rotation
The direction of rotation of the axial piston unit is defined by means of a pressure nipple screwed into the service line port and can easily be changed.
By changing the pressure nipple, the service line port and the suction port are exchanged. This is e.g. required when mounting at a PTO with an counter-clockwise direction of rotation.
The process of converting the pressure nipple can be seen from the instruction manual (91520-01-B, chapter 6.4.2 “Direction of rotation and changing the direction of rotation”).
Direction of rotation on delivery
On delivery, the pressure nipple (1) is pre-assembled in the right service line port of the axial piston unit. The permissible drive direction of the pump looking at the drive shaft: counter-clockwise. The power take-off turns clockwise.
Note
The pressure nipple is pre-assembled on delivery and must be tightened to the torque specified for the thread size before installation (see instruction manual).