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BOSCH REXROTH
AA2FM28/61W-VSD540
R902197566
Bent-Axis

Fixed motors: A2FM, A2F 28cm?/U

$3,512.00

BOSCH REXROTH

MATERIAL:  R902197566

SUMMARY:  Fixed motors: A2FM, A2F 28cm?/U

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technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/Utechnical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Threaded ports at the sides plugged with threaded plugs.
2) Please contact us.
3) Threaded ports and fastening threads are metric
4) Specify ordering code of counterbalance valve according to data sheet 95522 (BVD) respectively data sheet 95525 (BVE) separately.
5) Specify ordering code of sensor according to data sheet 95133 (DSA) respectively data sheet 95135 (HDD) separately.

Table of values

Size

10 12 16 23 28 32 107 125 160 180 250

Displacement
geometric, per revolution

Vg

cm³

10.3 12 16 22.9 28.1 32 106.7 125 160.4 180 250

Nominal pressure

pnom

bar

400 400 400 400 400 400 400 400 400 400 350

Maximum pressure

pmax

bar

450 450 450 450 450 450 450 450 450 450 400

Maximum speed

nnom 1)

rpm

8000 8000 8000 6300 6300 6300 4000 4000 3600 3600 2700

nmax 2)

rpm

8800 8800 8800 6900 6900 6900 4400 4400 4000 4000

Inlet flow 3)

at nnom

qV

l/min

82 96 128 144 177 202 427 500 577 648 675

Torque 4)

at pnom

M

Nm

66 76 102 146 179 204 679 796 1021 1146 1393

Rotary stiffness

c

kNm/rad

0.92 1.25 1.59 2.56 2.93 3.12 11.2 11.9 17.4 18.2 73.1

Moment of inertia for rotary group

JTW

kg·m²

0.0004 0.0004 0.0004 0.0012 0.0012 0.0012 0.0116 0.0116 0.022 0.022 0.061

Maximum angular acceleration

ɑ

rad/s²

5000 5000 5000 6500 6500 6500 4500 4500 3500 3500 10000

Case volume

V

l

0.17 0.17 0.17 0.2 0.2 0.2 0.8 0.8 1.1 1.1 2.5

Weight (approx.)

m

kg

5.4 5.4 5.4 9.5 9.5 9.5 32 32 45 45 73
1) These values are valid at:
- for the optimum viscosity range from vopt = 36 to 16 mm2/s
- with hydraulic fluid based on mineral oils
2) Intermittent maximum speed: overspeed for unload and overhauling processest, t < 5 s and Δp < 150 bar
3) Restriction of input flow with counterbalance valve
4) 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 found in data sheet 90261.

Speed range

No limit to minimum speed nmin. If uniformity of motion is required, speed nmin must not be less than 50 rpm.

Determining the operating characteristics

Inlet flow

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

[l/min]

Rotational speed

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

[rpm]

Torque

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

[Nm]

Power

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

[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)

Note

To reduce high temperature of the hydraulic fluid in the axial piston unit we recommend the use of a flushing and boost pressure valve (see chapter Extended functions and versions).

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).

Selection diagram

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

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.

Minimum pressure at inlet (pump operating mode)

pE min

see diagram

To prevent damage to the axial piston motor in pump mode (change of high-pressure side with unchanged direction of rotation, e.g. when braking),a minimum pressure must be guaranteed at the working port (inlet). The minimum pressure depends on the rotational speed and displacement of the axial piston unit.

Total pressure

pSu

700 bar

The summation pressure is the sum of the pressures at both work ports (A and B).

Rate of pressure change

Definition

with integrated pressure relief valve

RA max

9000 bar/s

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

without pressure relief valve

RA max

16000 bar/s

Case pressure at port T

Definition

Continuous differential pressure

ΔpT cont

2 bar

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

Pressure peaks

pT peak

10 bar

t < 0.1 s

Note

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

Minimum pressure at inlet (pump operating mode)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

This diagram is only valid for the optimum viscosity range of vopt = 16 to 36 mm2/sec..

If the above mentioned conditions cannot be ensured, please contact us.

Pressure definition

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Total operating period = t1 + t2 + ... + tn

Rate of pressure change

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Maximum differential pressure at the shaft seal

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

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

A to B

B to A

Permissible radial and axial forces of the drive shaft

Size

Drive shaft

Code

Maximum radial force
at distance a
(from shaft collar)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Fq max

a

Permitted torque at Fq max

Tq max

Permitted differential pressure at Fq max

Δpq max

Maximum axial force, when standstill or in non-pressurized conditions

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

+ Fax max

- Fax max

Maximum axial force, per bar operating pressure

+ Fax max

General instructions

The values given are maximum values and do not apply to continuous operation. The axial force in direction −Fax is to be avoided as the service life of the bearing is reduced. Special requirements apply in the case of belt drives. Please contact us.

Notes for size 250:

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 10 … 180

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Toothed gear drive, size 250

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

1

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

2

Direction of rotation "clockwise", pressure at port A

3

Direction of rotation "bidirectional"

Long-Life bearing

Size 250

For long service life and use with HF hydraulic fluids. Identical external dimensions as version with standard bearings. Subsequent conversion to long-life bearings is possible. Bearing and case flushing via port U is recommended.

Bearing flushing

Flushing flow (recommended)

Size

250

Flushing flow qv

l/min

10

Size 10 … 16

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Flange SAE J744

Drive shafts S, P and B

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Toothing data valid for basic number of teeth 48
2) Thread according to ASME B1.1
3) Center bore according to DIN 332 (thread according to DIN 13)

Ports

Size

10 12 16

A, B

Working port

Size

1 1/16 in 12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (must be connected)

T1

Drain port

Size

9/16 in 18UNF-2B; 13 mm deep

Standard 1)

ISO 11926

State on delivery 2)

Plugged (observe installation instructions)

T2

Drain port

Size

9/16 in 18UNF-2B; 13 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (observe installation instructions)
1) The spot face can be deeper than specified in the appropriate standard.
2) Unless otherwise specified. Other layouts on request.

Size 23 … 180

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Flange SAE J744

Size

D1

D8

D11

D17

D18

D19

D20

D25

D28

D29

D32

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

23 127 0
- 0.05
20 12.7 25 123 56 59 146 162 14.3 106
28 127 0
- 0.05
20 12.7 25 123 56 59 146 162 14.3 106
32 127 0
- 0.05
20 12.7 25 123 56 59 146 162 14.3 106
107 152.4 0
- 0.05
25 12.7 40 172 86 97 200 228.6 20.6 150
125 152.4 0
- 0.05
25 12.7 40 172 86 97 200 228.6 20.6 150
160 152.4 0
- 0.05
25 12.7 47 190 96 104 200 228.6 20.6 180
180 152.4 0
- 0.05
25 12.7 47 190 96 104 200 228.6 20.6 180

Drive shafts S and U

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Thread according to ASME B1.1

Splined shaft SAE J744

NG

Code

Designation 1)

Thread G

N2

N3

N4

N5

ØN6

N9

⌀N10

mm

mm

mm

mm

mm

mm

mm

23 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 35 55.9 80
28 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 35 55.9 80
32 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 35 35 55.9 80
107 U 1 1/2 in 23T 16/32 DP 5/8-11UNC-2B 12 36 56 62 50 69.9 125
S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 50 74.9 125
125 U 1 1/2 in 23T 16/32 DP 5/8-11UNC-2B 12 36 56 62 50 69.9 125
S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 50 74.9 125
160 S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 60 74.9 140
180 S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 60 74.9 140
1) Toothing data valid for basic number of teeth 48

Drive shafts P and B

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Center bore according to DIN 332 (thread according to DIN 13)

Parallel keyed shaft DIN 6885

NG

Code

Designation

Thread G

⌀N1

N2

N3

N5

⌀N6

N7

N8

N9

⌀N10

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

23 P ⌀25, AS8x7x40 M8 × 1.25 25 + 0.015
+ 0.002
6 19 50 35 28 8 57.9 80
B ⌀30, AS8x7x50 M10 × 1.5 30 + 0.015
+ 0.002
7.5 22 50 35 33 8 57.9 80
28 P ⌀25, AS8x7x40 M8 × 1.25 25 + 0.015
+ 0.002
6 19 50 35 28 8 57.9 80
B ⌀30, AS8x7x50 M10 × 1.5 30 + 0.015
+ 0.002
7.5 22 50 35 33 8 57.9 80
32 B ⌀30, AS8x7x50 M10 × 1.5 30 + 0.015
+ 0.002
7.5 22 50 35 33 8 57.9 80
107 P ⌀40, AS12x8x63 M12 × 1.75 40 + 0.018
+ 0.002
9.5 28 80 50 43 12 87.9 125
B ⌀45, AS14x9x63 M16 × 2 45 + 0.018
+ 0.002
12 36 80 50 48.5 14 87.9 125
125 B ⌀45, AS14x9x63 M16 × 2 45 + 0.018
+ 0.002
12 36 80 50 48.5 14 87.9 125
160 P ⌀45, AS14x9x70 M16 × 2 45 + 0.018
+ 0.002
12 36 90 60 48.5 14 97.9 140
B ⌀50, AS14x9x70 M16 × 2 50 + 0.018
+ 0.002
12 36 90 60 53.5 14 97.9 140
180 B ⌀50, AS14x9x70 M16 × 2 50 + 0.018
+ 0.002
12 36 90 60 53.5 14 97.9 140

Port plate 51

SAE working ports at rear

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Size

D3

D4

D14

D15

D34

D40

D41

D42

D46

mm

mm

mm

mm

mm

mm

mm

mm

mm

23 … 32 190 106 78 170 115 18.2 40.5 13 59
107 … 125 284 156 120 258 194 31.8 66.7 32 99
160 … 180 326 188 134 284 194 31.8 66.7 32 99

Port plate 52

SAE working ports at side, opposite

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Size

D3

D4

D7

D12

D13

D40

D41

D42

mm

mm

mm

mm

mm

mm

mm

mm

23 … 32 207 117 120 70 161 18.2 40.5 13
107 … 125 317 181 178 110 245 31.8 66.7 32
160 … 180 326 187 202 121 269 31.8 66.7 32

Port plate 53

Threaded ports at side, opposite

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Size

D3

D4

D7

D12

D13

mm

mm

mm

mm

mm

23 … 32 207 117 120 70 161

Port plate 54

Threaded ports at side and rear

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Size

D3

D4

D7

D12

D13

D14

D15

D34

D46

mm

mm

mm

mm

mm

mm

mm

mm

mm

23 … 32 207 118 130 70 161 89 183 120 58

Port plate 60

SAE working ports at bottom

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Size

D3

D4

D14

D15

D33

D34

D40

D41

D42

D46

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

107 … 125 293 158 136 258 194 70 31.8 66.7 32 99

Note

The dimensional drawings of the port plates with valves can be found in the chapter "Extended functions and versions".

Ports

Size

23 28 32 107 125 160 180

A, B
(plate 51, 52, 60)

Working port

Size

1/2 in 1 1/4 in

Standard

Dimensions according to SAE J518

Fastening thread

5/16 18UNC-2B; 18 mm deep 1/2 13UNC-2B; 19 mm deep

State on delivery

With protective cover (must be connected)

A, B
(plate 53, 54)

Working port

Size

1 5/16 12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (must be connected)

T1

Drain port

Size

3/4 16UNF-2B; 15 mm deep 7/8 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 3)

With protective cover (observe installation instructions)

T2

Drain port

Size

3/4 16UNF-2B; 15 mm deep 7/8 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 3)

Plugged (observe installation instructions)
1) The spot face can be deeper than specified in the appropriate standard.
2) Unless otherwise specified: In case of connection plate 54 ports at the sides plugged. Other layouts on request.
3) Unless otherwise specified. Other layouts on request.

Size 250

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Flange SAE J744

Drive shafts S and K

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U
1) Toothing data valid for basic number of teeth 48
2) Thread according to ASME B1.1

Port plate 51

SAE working ports at rear

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Port plate 52

SAE working ports at side, opposite

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Ports

Size

250

A, B

Working port

Size

1 1/4 in

Standard

Dimensions according to SAE J518

Fastening thread

1/2 13UNC-2B; 19 mm deep

State on delivery

With protective cover (must be connected)

T1

Drain port

Size

7/8 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (observe installation instructions)

T2

Drain port

Size

7/8 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 2)

Plugged (observe installation instructions)

U

Bearing flushing

Size

9/16 18UNF-2B; 13 mm deep

Standard 1)

ISO 11926

State on delivery

Plugged
1) The spot face can be deeper than specified in the appropriate standard.
2) Unless otherwise specified. Other layouts on request.

Flushing and boost pressure valve

The flushing and boost pressure valve is used in closed circuits for the removal of heat and to ensure a minimum boost pressure level.

Hydraulic fluid is directed from the respective low pressure side into the motor housing. This is then fed into the reservoir, together with the leakage. The removed hydraulic fluid must be replaced by cooled hydraulic fluid from the boost pump.

With port plate 527, the valve is mounted directly on the fixed motor (sizes 23 to 250).

 

Cracking pressure of pressure retaining valve

(observe when setting the primary valve)

Sizes 23 to 250, fixed setting: 16 bar

 

Switching pressure of flushing piston Δp

Sizes 23 to 250: 8±1 bar

Flushing and boost pressure valve

The flushing and boost pressure valve is used in closed circuits for the removal of heat and to ensure a minimum boost pressure level.

Hydraulic fluid is directed from the respective low pressure side into the motor housing. This is then fed into the reservoir, together with the leakage. The removed hydraulic fluid must be replaced by cooled hydraulic fluid from the boost pump.

With port plate 527, the valve is mounted directly on the fixed motor (sizes 23 to 250).

 

Cracking pressure of pressure retaining valve

(observe when setting the primary valve)

Sizes 23 to 250, fixed setting: 16 bar

 

Switching pressure of flushing piston Δp

Sizes 23 to 250: 8±1 bar

Circuit diagram

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Circuit diagram

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Flushing flow qv

 

Orifices can be used to adjust the flushing flows as required. The following information is based on:
ΔpND = pND – pG = 25 bar und ν = 10 mm2/s

(pND = low pressure, pG = case pressure)

Flushing flow qv

 

Orifices can be used to adjust the flushing flows as required. The following information is based on:
ΔpND = pND – pG = 25 bar und ν = 10 mm2/s

(pND = low pressure, pG = case pressure)

Size 23 … 180

Material number of orifice

Flushing flow qv

Orifice-⌀

l/min

mm

R909651766

3.5

1.2

R909419695

5

1.4

R902030345

6.5

1.6

R909419696

8

1.8

R909419697

10

2

R902107424

13

2.3

R909444361

14

2.4

Size 23 … 180

Material number of orifice

Flushing flow qv

Orifice-⌀

l/min

mm

R909651766

3.5

1.2

R909419695

5

1.4

R902030345

6.5

1.6

R909419696

8

1.8

R909419697

10

2

R902107424

13

2.3

R909444361

14

2.4

For flushing flows deviating from the values in the table, please state the required flushing flow when ordering.

The flushing flow without orifice is approx. 12 to 14 l/min at low pressure ΔpND = 25 bar.

For flushing flows deviating from the values in the table, please state the required flushing flow when ordering.

The flushing flow without orifice is approx. 12 to 14 l/min at low pressure ΔpND = 25 bar.

Size 250

Standard flushing flow: 10 l/min

For other flushing flows please contact us.

Size 250

Standard flushing flow: 10 l/min

For other flushing flows please contact us.

Dimensions

Dimensions

Port plate 527

SAE working ports at side, opposite

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Port plate 527

SAE working ports at side, opposite

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Pressure relief valve

The MHDB pressure relief valves protect the hydraulic motor from overload. As soon as the set cracking pressure is reached, the hydraulic fluid flows from the high-pressure side to the low-pressure side.

The pressure relief valves are only available in conjunction with connection plates 181, 191 or 192. (Connection plate 181: see section “BVD and BVE counterbalance valve”

 

Setting range of cracking pressure: 50 up to 420 bar

 

For versions “with pressure sequencing stage” (code 192), a higher pressure setting can be implemented by connecting an external pilot pressure of 25 up to 30 bar at port pSt.

When ordering, state in plain text:

Cracking pressure of pressure relief valve Cracking pressure with pilot pressure applied to pSt (only with version 192)

Pressure relief valve

The MHDB pressure relief valves protect the hydraulic motor from overload. As soon as the set cracking pressure is reached, the hydraulic fluid flows from the high-pressure side to the low-pressure side.

The pressure relief valves are only available in conjunction with connection plates 181, 191 or 192. (Connection plate 181: see section “BVD and BVE counterbalance valve”

 

Setting range of cracking pressure: 50 up to 420 bar

 

For versions “with pressure sequencing stage” (code 192), a higher pressure setting can be implemented by connecting an external pilot pressure of 25 up to 30 bar at port pSt.

When ordering, state in plain text:

Cracking pressure of pressure relief valve Cracking pressure with pilot pressure applied to pSt (only with version 192)

Version without pressure boost facility (code 191)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Version without pressure boost facility (code 191)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Version with pressure boost facility (code 192)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Version with pressure boost facility (code 192)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Dimensions

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Dimensions

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve BVD and BVE

Function

Travel drive/winch counterbalance valves are designed to reduce the danger of overspeeding and cavitation of axial piston motors in open circuits. Cavitation occurs if the motor speed is greater than it should be for the given input flow while braking, travelling downhill, or lowering a load.

If the inlet pressure drops, the counterbalance spool throttles the return flow and brakes the motor until the inlet pressure returns to approx. 20 bar.

 

Note

BVD available for sizes 28 to 180 and BVE available for sizes 107 to 180. The counterbalance valve must be ordered additionally. We recommend ordering the counterbalance valve and the motor as a set. Ordering example: A2FM(E)90/61W–VAB188 + BVD20F27S/41B–V03K16D0400S12 The counterbalance valve does not replace the mechanical service brake and park brake. Observe the detailed notes on the BVD counterbalance valve in data sheet 95522 and BVE counterbalance valve in data sheet 95525! For the design of the brake release valve, we must know for the mechanical park brake: the pressure at the start of opening the volume of the counterbalance spool between minimum stroke (brake closed) and maximum stroke (brake released with 21 bar) the required closing time for a warm device (oil viscosity approx. 16 mm2/s)

Travel drive counterbalance valve BVD...F

Application option:

Travel drive on wheeled excavators

Counterbalance valve BVD and BVE

Function

Travel drive/winch counterbalance valves are designed to reduce the danger of overspeeding and cavitation of axial piston motors in open circuits. Cavitation occurs if the motor speed is greater than it should be for the given input flow while braking, travelling downhill, or lowering a load.

If the inlet pressure drops, the counterbalance spool throttles the return flow and brakes the motor until the inlet pressure returns to approx. 20 bar.

 

Note

BVD available for sizes 28 to 180 and BVE available for sizes 107 to 180. The counterbalance valve must be ordered additionally. We recommend ordering the counterbalance valve and the motor as a set. Ordering example: A2FM(E)90/61W–VAB188 + BVD20F27S/41B–V03K16D0400S12 The counterbalance valve does not replace the mechanical service brake and park brake. Observe the detailed notes on the BVD counterbalance valve in data sheet 95522 and BVE counterbalance valve in data sheet 95525! For the design of the brake release valve, we must know for the mechanical park brake: the pressure at the start of opening the volume of the counterbalance spool between minimum stroke (brake closed) and maximum stroke (brake released with 21 bar) the required closing time for a warm device (oil viscosity approx. 16 mm2/s)

Travel drive counterbalance valve BVD...F

Application option:

Travel drive on wheeled excavators

Example schematic for travel drive on wheeled excavators

A2FM(E)090/61W-VAB188 + BVD20F27S/41B–V03K16D0400S12

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Example schematic for travel drive on wheeled excavators

A2FM(E)090/61W-VAB188 + BVD20F27S/41B–V03K16D0400S12

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Winch counterbalance valve BVD...W and BVE

Application options:

Winch drive in cranes (BVD and BVE) Track drive in excavator crawlers (BVD)

Winch counterbalance valve BVD...W and BVE

Application options:

Winch drive in cranes (BVD and BVE) Track drive in excavator crawlers (BVD)

Example schematic for winch drive in cranes
A2FM(E)090/61W-VAB188 + BVE25W385/51ND-V100K00D4599T30S00-0

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Example schematic for winch drive in cranes
A2FM(E)090/61W-VAB188 + BVE25W385/51ND-V100K00D4599T30S00-0

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Dimensions

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Dimensions

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Speed sensors

The versions AA2FM...U and AA2FM...F ("prepared for speed sensor", i.e. without sensor) are equipped with a toothed ring on the rotary group.

On deliveries "prepared for speed sensor", the port is plugged with a pressure-resistant cover.

With the DSA or HDD speed sensor mounted a signal proportional to motor speed can be generated. The sensors measures the speed and direction of rotation.

Ordering code, technical data, dimensions and details on the connector, plus safety information about the sensor can be found in the relevant data sheet.

 

DSA: data sheet 95133

HDD: data sheet 95135

 

The sensor is mounted at the specially provided port as follows:

DSA: with one mounting bolt

HDD: with two mounting bolts

 

We recommend ordering the AA2FM fixed motor complete with sensor mounted.

Speed sensors

The versions AA2FM...U and AA2FM...F ("prepared for speed sensor", i.e. without sensor) are equipped with a toothed ring on the rotary group.

On deliveries "prepared for speed sensor", the port is plugged with a pressure-resistant cover.

With the DSA or HDD speed sensor mounted a signal proportional to motor speed can be generated. The sensors measures the speed and direction of rotation.

Ordering code, technical data, dimensions and details on the connector, plus safety information about the sensor can be found in the relevant data sheet.

 

DSA: data sheet 95133

HDD: data sheet 95135

 

The sensor is mounted at the specially provided port as follows:

DSA: with one mounting bolt

HDD: with two mounting bolts

 

We recommend ordering the AA2FM fixed motor complete with sensor mounted.

DSA speed sensor mounted (code V)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

DSA speed sensor mounted (code V)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

HDD speed sensor mounted (code H)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

HDD speed sensor mounted (code H)

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

 

Installation information

General information

During commissioning and during operation, the axial piston unit must be filled with hydraulic fluid and bled. This must also be observed during longer standstill as the axial piston unit might drain itself via the hydraulic lines. Complete filling and bleeding must especially be ensured with the “Drive shaft upwards” installation position as there is, for example, the risk of running dry. The leakage in the housing area must be discharged to the tank via the highest-located drain port (T1, T2). If one joint drain line is used for several units, it is to be ensured that the relevant housing pressure is not exceeded. The joint drain line must be dimensioned so that the maximum admissible housing pressure of all connected units is not exceeded in any operating state, particularly during cold start. If this is not possible, separate drain lines have to be laid, if necessary. In order to achieve favorable noise values, all connection lines are to be decoupled using elastic elements and over-tank installation is to be avoided. The tank line must lead into the tank below the minimum liquid level in every operating state.

Installation position

See the following examples 1 to 8.

Further installation positions are possible upon request. Recommended installation position: 1 and 2.

Note

For installation position 4 and 8 "shaft upwards" an air bleed port R is required (specify in plain text when ordering, special version).

With size 250, port U is provided as standard in the area near the bearings for air bleeding.

Below-tank installation (standard)

Below-tank installation is at hand if the axial piston unit is installed below the minimum liquid level outside the tank.

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Installation position

Air bleeding

Filling

1

T1

2

T2

3

T1

4

R (U)

T2

Above-reservoir installation

Above-reservoir installation means that the axial piston unit is installed above the minimum fluid level of the reservoir.

Recommendation for installation position 8 (drive shaft upward): A check valve in the drain line (cracking pressure 0,5 bar) can prevent draining of the pump housing.

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Installation position

Air bleeding

Filling

5

F

T1 (F)

6

F

T2 (F)

7

F

T1 (F)

8

R (U)

T2 (F)

Key

F

Filling / Air bleeding

R

Air bleed port

U

Bearing flushing / air bleed port

T1, T2

Tank port

ht min

Minimum required immersion depth (200 mm)

hmin

Minimum required spacing to reservoir bottom (100 mm)

Note: Connection F is part of the external piping and must be provided on the customer side to simplify the filling and bleeding.

General project planning notes

The axial piston unit is designed to be used in open and closed circuits. The project planning, installation and commissioning of the axial piston unit require the involvement of qualified skilled personnel. Before using the axial piston unit, please read the corresponding instruction manual completely and thoroughly. If necessary, request it from Bosch Rexroth. Before finalizing your design, request a binding installation drawing. The specified datas and notes must be observed. Preservation: Our axial piston units are supplied as standard with preservative protection for a maximum of 12 months. If longer preservative protection is required (maximum 24 months), please specify this in plain text when placing your order. The preservation times are valid under optimal storage conditions. Details of these conditions can be found in the data sheet 90312 or the instruction manual. Not all versions of the product are approved for use in a safety function according to ISO 13849. Please consult the responsible contact person at Bosch Rexroth if you require reliability parameters (e.g. MTTFD) for functional safety. A pressure relief valve is to be provided in the hydraulic system. Observe the instructions in the instruction manual regarding tightening torques of connection threads and other threaded joints used. The notes in the instruction manual on tightening torques of the port threads and other screw joints must be observed. The ports and fastening threads are designed for the permissible maximum pressure pmax (see instruction manual). The machine or system manufacturer must ensure that the connecting elements and lines correspond to the specified operating conditions (pressure, flow, hydraulic fluid, temperature) with the necessary safety factors. The working ports and function ports are designated only to accommodate hydraulic lines.

Counterbalance valve

BVD 20-25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVD 20-25

Double acting for travel drives and winch drives Size 20 … 25 Nominal pressure 350 bar Maximum pressure 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVD 20-25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVD 20-25

Double acting for travel drives and winch drives Size 20 … 25 Nominal pressure 350 bar Maximum pressure 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVD 20-25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVD 20-25

Double acting for travel drives and winch drives Size 20 … 25 Nominal pressure 350 bar Maximum pressure 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVE 25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVE 25

Single acting for controlled load lowering in winch drives Size 25 Nominal pressure pump side 350 bar Nominal pressure motor side 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVD 20-25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVD 20-25

Double acting for travel drives and winch drives Size 20 … 25 Nominal pressure 350 bar Maximum pressure 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVE 25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVE 25

Single acting for controlled load lowering in winch drives Size 25 Nominal pressure pump side 350 bar Nominal pressure motor side 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVD 20-25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVD 20-25

Double acting for travel drives and winch drives Size 20 … 25 Nominal pressure 350 bar Maximum pressure 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVE 25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVE 25

Single acting for controlled load lowering in winch drives Size 25 Nominal pressure pump side 350 bar Nominal pressure motor side 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVD 20-25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVD 20-25

Double acting for travel drives and winch drives Size 20 … 25 Nominal pressure 350 bar Maximum pressure 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

Counterbalance valve

BVE 25

technical illustration-AA2FM28/61W-VSD540-Fixed motors: A2FM, A2F          28cm?/U

Counterbalance valve

BVE 25

Single acting for controlled load lowering in winch drives Size 25 Nominal pressure pump side 350 bar Nominal pressure motor side 420 bar Direct attachment on Rexroth axial piston motors (A2FM / A2FE / A6VM / A6VE)

Data sheet

During and shortly after operation, there is a risk of burns on the axial piston unit. Take appropriate safety measures (e.g. by wearing protective clothing).