Specifications Rexroth Fixed Displacement Motor A4FM

Industrial Hydraulics

Electric Drives and Controls

Linear Motion and Assembly Technologies

Pneumatics

Service Automation

Fixed Displacement Motor A4FM

Mobile Hydraulics

RE 91 120/04.00 replaces: 03.95 and RE 91 100

for open and closed circuits

Sizes 22...500 Series 1, Series 3 Nominal pressure up to 400 bar Peak pressure up to 450 bar

Index Features Ordering Code Technical Data Installation and Commissioning Guidelines Flow and Output Torque Unit Dimensions, Sizes 22, 28 Unit Dimensions, Size 40 Unit Dimensions, Size 56 Unit Dimensions, Size 71 Unit Dimensions, Size 125 Unit Dimensions, Size 250

Features 1 2 3...5 4 6 7 8 9 10 11 12

– Axial Piston Fixed Displacement Motor A4FM of swashplate design is used in open and closed loop circuits for hydrostatic drives.

– Output speed is proportional to input flow and inversely proportional to motor displacement.

– Output torque increases with the pressure drop across the motor between the high and low pressure sides.

– Long service life, optimum efficiencies – Compact design for special applications where A2FM cannot be applied – Proven rotary group in swashplate-technology

2/12

Bosch Rexroth AG | Mobile Hydraulics

A4FM | RE 91 120/04.00

Ordering Code A4F M Hydraulic fluid Mineral oil, HFD (no code) HFA, HFB, HFC-Hydraulic fluid (only sizes 71...500) Axial piston unit Swashplate design, fixed displacement

W –

E-

A4F

Mode of operation Motor Size Displacement Vg (cm3)

/

M

22

28

40

56

71 125 250 500

Series Sizes 22...56, 125...500 Size 71

3 1

Sizes 22...56 Sizes 71...500

2 0

alternating

W

Index

Direction of rotation Viewed on shaft end Seals

NBR (Nitril-caoutchouc), shaft sealing in FKM (Fluor-caoutchouc) FKM (Fluor-caoutchouc) Shaft end Splined shaft SAE Splined shaft SAE Splined shaft DIN 5480 Parallel with key DIN 6885

22

– –

Mounting flange SAE 2-hole ISO 4-hole ISO 8-hole

28

Sizes 22...56 Sizes 71...500 Sizes 71...500

40 – –

56 – –

– –

–

–

22

28

40

56

– –

– –

– –

– –

Service line connections Ports A, B: SAE at rear (with metric fixing screws) Ports A, B: SAE at side (on opposite sides) (with metric fixing screws) = available = available on enquiry – = not available

N P V

71 125 250 500 – – – – – – – –

71 125 250 500 – – – – – – – – 22...40

56

– –

S T Z P

C B H 71...500 01 02

RE 91 120/04.00 | A4FM

Mobile Hydraulics | Bosch Rexroth AG

3/12

Technical Data Fluid We request that before starting a project detailed information about the choice of pressure fluids and application conditions are taken from our catalogue sheets RE 90220 (mineral oil), RE 90221 (environmentally acceptable hydraulic fluids) and RE 90223 (fire resistance fluids, HF).

When using HF- or environmentally acceptable hydraulic fluids possible limitations for the technical data have to be taken into consideration. If necessary please consult our technical department (please indicate type of the hydraulic fluid used for your application on the order sheet).

The sizes 22..56 are not suitable for operation with HFA, HFB and HFC.

Notes on the selection of the hydraulic fluid In order to select the correct fluid, it is necessary to know the operating temperature in the loop (closed circuit) or the tank temperature (open circuit) in relation to the ambient temperature.

The hydraulic fluid should be selected so that within the operating temperature range, the operating viscosity lies within the optimum range (νopt) (see shaded section of the selection diagram). We recommend that the highest possible viscosity range should be chosen in each case.

Example: At an ambient temperature of X°C the operating temperature is 60°C. Within the operating viscosity range (νopt; shaded area), this corresponds to viscosity ranges VG 46 or VG 68.

VG 68 should be selected.

Important: The leakage oil (case drain oil) temperature is influenced by pressure and motor speed and is always higher than the circuit temperature. However, at no point in the circuit may the temperature exceed 115°C for sizes 22...56 or 90°C for sizes 71...500.

If it is not possible to comply with the above condition because of extreme operating parameters or high ambient temperatures we recommend housing flushing. Please consult us.

Operation viscosity range In order to obtain optimum efficiency and service life, we recommend that the operating viscosity (at operating temperature) be selected from within the range: νopt = operating viscosity 16...36 mm2/s referred to the loop temperature (closed circuit) or tank temperature (open circuit).

Filtration The finer the filtration the better the achieved purity grade of the pressure fluid and the longer the life of the axial piston unit. To ensure the functioning of the axial piston unit a minimum purity grade of: 9 to NAS 1638 18/15 to ISO/DIS 4406 is necessary.

At very high temperatures of the hydraulic fluid (90°C to max. 115°C, not permissible for sizes 71...500) at least cleanless class 8 to NAS 1638 17/14 to ISO/DIS 4406 is necessary.

If above mentioned grades cannot be maintained please consult supplier.

Viscosity limits The limiting values for viscosity are as follows:

Size 22...56 νmin = 5 mm2/s, short term at a max. permissible temp. of tmax= 115°C νmax = 1600 mm2/s, short term on cold start (tmin = -40°C) Size 71...500 νmin = 10 mm2/s, short term at a max. permissible drain temp. tmax = 90°C νmax = 1000 mm2/s, short term on cold start (tmin = -25°C) Please note that the max. fluid temperature is also not exceeded in certain areas (for instance bearing area).

At temperature of -25°C up to -40°C special measures may be required for certain installation positions, please contact us.

2500-40° 1600 1000 600 400

-20°

0°

20°

40°

60°

80° 100°

1600

0 10 G V 68 G V 46 G V 32 G V 2 2

VG

viscosity ν in mm2/s

Selection diagram

200 100 60 40

36 νopt.

20

16

10

5 -40°

-25°

tmin = -40°C

-10° 0° 10°

30°

50°

fluid temperature range

70°

90°

5 115°

temperature t in °C tmax = +115°C

4/12

Bosch Rexroth AG | Mobile Hydraulics

A4FM | RE 91 120/04.00

Installation and Commissioning Guidelines

Technical Data valid for operation with mineral oils

Flushing of the bearings (Sizes 125...500) operating conditions, flushing quantities and notes on bearing flushing see RE 92 050 (A4VSO).

Operating pressure range Maximum pressure at port A or B (Pressure data to DIN 24312) Size 22...56 71...500 1 Nominal pressure pN bar 400 ) 350 1 Peak pressure pmax bar 450 ) 400 1) Size 28 with S-shaft: 315/350 bar The summ of the pressures at ports A and B may not exceed 700 bar.

Direction of flow clockwise rotation

anti-clockwise rotation

A to B

B to A

Symbol Size 22...56 A, B Service line ports T1, T2 Case drain (1 port plugged)

General At start-up and during operation the motor housing has imperatively to be filled up with hydraulic fluid (filling of the case chamber). Startup has to be carried out at low speed and without load till the system is completely bleeded.

At a longer standstill the case may discharge via operating line. At new start-up a sufficient filling of the housing has to be granted.

The leakage oil in the housing has to be discharged to the tank via highest positioned case drain port.

Installation position - Sizes 22...56: Shaft horizontal or shaft down - Sizes 71 (series1): Shaft horizontal, vertical installation position as to agreement - Sizes 125...500: Optional, at vertical installation position bearing flushing is recommended at port U (as to RD 9205)

A

Installation below tank level Motor below min. oil level in the tank (standard) ➔ Fill up axial piston motor before start-up via highest positioned case drain port

Size 71...500 A, B Service line ports MA,MB Pressure gauge, working pressure T, R(L) Case drain, Air bleed (1port plugged) U Flushing port (Sizes71...500)

B B

T1 T2 MB

➔ Operate motor at low speed till motor system is completely filled up ➔ Minimum immerson depth of the drain line in the tank: 200mm (relative to the min. oil level in the tank).

T1

U M A

Case drain pressure pabs (bar)

A T R(L) Case drain pressure The max. permissible leakage pressure (housing pressure) is dependent on speed (see diagram). The pressure in the housing must be equal to or greater than the external pressure on the shaft sealing ring.

Max. leakage pressure (housing pressure) pabs. max. _________________________ 6 bar (sizes 22...56) _________________________ 4 bar(sizes71...500) A leakage line to the tank is necessary.

6 Sizes 22, 28

5 Sizes 40, 56

T T1 T2 T2

T

Installation on top of tank level Motor on top of min. oil level in the tank ➔ Actions as installation below tank level ➔ Note: installation position "drive shaft up" for sizes 22...56 not permissible

Size 71

4

T

T1

Size 125

3 T1

Size 250

T2

2 T2

Size 500

1 0

1000

2000

3000

4000

5000

speed n (rpm)

T

RE 91 120/04.00 | A4FM

Mobile Hydraulics | Bosch Rexroth AG

5/12

Technical Data valid for operation with mineral oil

Table of values (theoretical values, without considering ηmh and ηv; values rounded)

Size cm3

22

28

40

56

71

125

250

500

22

28

40

56

71

125

250

500

Displacement

Vg

Max. speed

nmax continuous rpm

4250

4250

4000

3600

3200

2600

2200

1800

nmax interm.1)

rpm

5000

5000

5000

4500

–

–

–

–

Max. flow (at nmax)

qV max

L/min

93

119

160

202

227

325

550

900

Torque constants

TK

Nm/bar

0,35

0,445

0,64

0,89

1,13

1,99

3,97

7,95

6962)

13912)

27832)

3,0

7,0

11,0

Torque (at ∆p = 400 bar)

Tmax

Filling volume Moment of inertia about drive axis

140

178

255

356

L

0,3

0,3

0,4

0,5

2,0

kgm2

J

Actual starting torque at n = 0 rpm (∆p = 350 bar)

0,0015 0,0015 0,0043 0,0085 0,0121 0,0300 0,0959 0,3325

Nm (approx.)

m

Weight (approx.)

1)

Nm

3952)

kg

11

11

Intermittent max. speed at overspeed: ∆p = 70…150 bar

2)

15

21

320

564

1127

34

61

120

∆p = 350 bar

Calculation of size Flow

qv =

Output speed

n=

Output torque

T=

Vg • n 1000 • ηv

in L/min

qV • 1000 • ηV Vg Vg • ∆p • ηmh 20 • π

in Nm

Vg ∆p n ηv ηmh ηt

= = = = = =

geometric displacement per rev. in cm3 pressure differential in bar speed in rpm volumetric efficiency mech.-hyd. efficiency overall efficiency

= TK • ∆p • ηmh Output power

P= =

T•n 9549

=

2π•T•n 60 000

in kW

qv • ∆p• ηt 600

Output drive permissible axial and radial loading on drive shaft Size Distance of Fq (from shaft shoulder)

Fq

a, b, c Max. permissible radial force at distance a

b c Max. permissible axial load

+

Fax

Size Max. axial force at housing pressure pmax 1 bar abs.

Max. axial force at housing pressure pmax 4 bar abs.

a b c Fq max Fq max Fq max - Fax max

mm mm mm N N N N

+ Fax max N

Fq ± Fax X/2

Max. radial force

X/2 X

22 17,5 30 42,5 2500 1400 1000 1557

28 17,5 30 42,5 2050 1150 830 1557

40 17,5 30 42,5 3600 2890 2416 2120

56 17,5 30 42,5 5000 4046 3398 2910

417

417

880

1490

N N N N

71 1400 810 1990 1700

125 1900 1050 2750 2500

± Fax max + Fax max – Fax max Fq max

250 3000 1850 4150 4000

500 4000 2500 5500 5000

6/12

Bosch Rexroth AG | Mobile Hydraulics

A4FM | RE 91 120/04.00

Flow and Drive Torque Size 500 400

400

1400

200

T

100

100

0

0 0

100

200

300

flow qV (L/min)

qV

drive torque T (Nm)

flow qV (L/min)

300

300

200

2800

n = 1000 rpm n = 1800 rpm

n = 1500 rpm n = 3200 rpm 1300

2600

1200

2400

1100

2200

1000

2000

900

1800

800

1600

350

∆ p (bar)

Size 125 700

700

600

600

500

500

400

400

drive torque T (Nm)

flow qV (L/min)

n = 1500 rpm n = 2600 rpm

300

300

qV

T

200

200

100

100

0

0 0

100

200

300

qV

700

T

1400

600

1200

500

1000

400

800

300

600

200

400

100

200

350

∆ p (bar) 0

1400

700

1200

500

1000

qV 800

400

200

300

350

drive torque T (Nm)

600

100

∆ p (bar)

n = 1500 rpm n = 2200 rpm

flow qV (L/min)

0

0

Size 250

600

300

T 200

400

100

200

0

0 0

100

200

300

350

∆ p (bar)

(Fluid: Hydraulic oil ISO VG 46 DIN 51519, t = 50°C)

drive torque T (Nm)

Size 71

RE 91 120/04.00 | A4FM

Mobile Hydraulics | Bosch Rexroth AG

7/12

Unit Dimensions, Size 22, 28

(SAE B)

Before finalising your design, please request a certified drawing.

B

A B, A

M8; 15 deep

T1, T2 Leakage port / oil filling port

Shaft ends

T Splined shaft SAE 1" 30° pressure angle, 15 teeth, 16/32 pitch, flat root, side fit, tolerance class 5 ANSI B92.1a-1976

19 41,3

3/8-16UNC-2B

6

ø55

25

ø17,7

8",

5/16-18UNC-2B

7/

ø55

30° pressure angle, 13 teeth, 16/32 pitch, flat root, side fit, tolerance class 5 ANSI B92.1a-1976

38

33

S Splined shaft SAE

SAE 1/2" 420 bar (6000 psi) high pressure series M18x1,5; 12 deep

30 7,5

22 46

ø20,8

Connections A, B Service line ports

8/12

Bosch Rexroth AG | Mobile Hydraulics

A4FM | RE 91 120/04.00

Unit Dimensions, Size 40 Before finalising your design, please request a certified drawing.

T1

(SAE B)

B, A

T1

A

B

T2 T2

Connections A, B Service line ports T, T1, T2 Leakage port / oil filling port

Shaft ends

Z Splined shaft W 30x2x30x14x9g DIN 5480

M10; 17 deep

SAE 3/4" 420 bar (6000 psi) high pressure serie M18x1,5; 15 deep

T

RE 91 120/04.00 | A4FM

Mobile Hydraulics | Bosch Rexroth AG

9/12

Unit Dimensions, Size 56 Before finalising your design, please request a certified drawing.

155,4 12,7

213 181

82 7 18

61

T1

48

18 32 150

X 48

ø127 (SAE C)

T1

B; A T2

T2 205,4

61

View X 158 75

58

T

A

150

B

58

50,8

T, T1, T2 Leakage port / oil filling port

23,8

SAE 3/4" 420 bar (6000 psi) high pressure serie M 18x1,5 ; 12 deep ø19

Connections A, B Service line ports

M10; 17 deep

Shaft ends

Z Splined shaft W 30x2x30x14x9g DIN 5480

T

10/12

Bosch Rexroth AG | Mobile Hydraulics

A4FM | RE 91 120/04.00

Unit Dimensions, Size 71 Before finalising your design, please request a certified drawing.

port plate 01

34

ø15

R(L) 83.5

MB

80

ø1

43

61

ø140h8

X

12h9

170 183

8

MA

83.5

132

170 176

T

263

port plate 01 View X

port plate 02

Y

B

ø25

View Y

A, B

B

MA A 224

M12; 17 deep

27.8

A M12; 17 deep

Y

to mounting flange267

27.8

87.5

57.2

37.5 37.5

ø25

87.5

MB

45°

45°

27.8

20

57.2

Connections A, B service line ports R (L) oil filling and bleed T oil drain (plugged) MA, MB measuring port for pressure (plugged)

Shaft end

Z

9,5

Splined shaft W40x2x30x18x9g DIN 5480

45 37 9,5

M12

ø40k6 M12

Parallel shaft with key

28

,6

AS 12x8x68 DIN 6885

68

1,5

66 70 80

R1

P

28 55

SAE 1" (high pressure series) M27x2 M27x2 M14x1,5

RE 91 120/04.00 | A4FM

Mobile Hydraulics | Bosch Rexroth AG

11/12

Unit Dimensions, Size 125 Before finalising your design, please request a certified drawing.

102 ø20

port plate 01

36 29

R(L) 98.5

00

14h9

ø2

74

X

200 213

53.5

ø160h8

MB

MA 156

T

299

Y

98.5

ø32

View Y

A, B

41.5 41.5

B

MA A 261 to mounting flange 305

M14; 19 deep

31.8

A M14; 19 deep

Y Connections A, B service line ports R (L) T MA, MB U

1,5

12

Splined shaft

,5

36

54 45 12

Z W50x2x30x24x9g DIN 5480

ø50k6 M16

Parallel shaft with key 14x9x80 DIN 6885

80

78 82 92

R2

P

M16

Shaft end

oil filling and bleed oil drain (plugged) measuring port for pressure (plugged) Flushing port, flushing of the bearings (plugged)

36 64

31.8

102.5

ø32 66.7

102.5

MB

200 206

port plate 01 View X

port plate 02

B

45°

45°

31.8

24

U

14

8

66.7

SAE 1 1/4" (high pressure series) M33x2 M33x2 M14x1,5 M14x1,5

12/12

Bosch Rexroth AG | Mobile Hydraulics

A4FM | RE 91 120/04.00

Unit Dimensions, Size 250 Before finalising your design, please request a certified drawing.

8

129

R(L)

port plate 01

ø24

18h9

ø224h8

131

MB

0

ø28

91

64

X

45°

45°

MA T

30 203

124.5 260 268

378

port plate 01 View X

port plate 02

Y

B

36.5

View Y

B

ø38 79.4 132.5

MA

36.5

38 79.4

Y Connections A, B service line ports

385

R (L) T MA, MB U Shaft end

3

P

100 15

Splined shaft

R4

42 101 105 115

Bosch Rexroth AG Mobile Hydraulics Product Segment Axial Piston Units Elchingen Plant Glockeraustrasse 2 89275 Elchingen, Germany Telephone +49 (0) 73 08 82-0 Facsimile +49 (0) 73 08 72 74 info.brm-ak@boschrexroth.de www.boschrexroth.com/brm

SAE 1 1/2" (high pressure series) M42x2 M42x2 M14x1,5 M14x1,5

70 59 15

Z W60x2x30x28x9g DIN 5480

ø60m6 M20

Parallel shaft with key

oil filling and bleed oil drain (plugged) measuring port for pressure (plugged) Flushing port, flushing of the bearings (plugged)

M16; 21 deep

M20

333 to mounting flange

AS 18x11x100 DIN 6885

A

M16; 21 deep

A

50.5 50.5

A, B

132.5

MB

U

34.5 265 273

48 16

Horb Plant An den Kelterwiesen 14 72160 Horb, Germany Telephone +49 (0) 74 51 92-0 Facsimile +49 (0) 74 51 82 21

42 80

© 2003 by Bosch Rexroth AG, Mobile Hydraulics, 89275 Elchingen All rights reserved. No part of this document may be reproduced or stored, processed, duplicated or circulated using electronic systems, in any form or by any means, without the prior written authorization of Bosch Rexroth AG. In the event of contravention of the above provisions, the contravening party is obliged to pay compensation.

The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The given information does not release the user from the obligation of own judgement and verification. It must be remembered that our products are subject to a natural process of wear and aging.