Fixed Displacement Motor 4FM RE 91 12/4. replaces: 3.95 and RE 91 1 for open and closed circuits Sizes 22...5 Series 1, Series 3 Nominal pressure up to bar Peak pressure up to 45 bar Index Features 1 Ordering Code 2 echnical Data 3...5 Installation and Commissioning Guidelines 4 Flow and Output orque 6 Unit Dimensions, Sizes 22, 28 7 Unit Dimensions, Size 4 8 Unit Dimensions, Size 56 9 Unit Dimensions, Size 71 1 Unit Dimensions, Size 125 11 Unit Dimensions, Size 25 12 Features xial Piston Fixed Displacement Motor 4FM 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 2FM cannot be applied Proven rotary group in swashplate-technology
2/12 osch Rexroth G Mobile Hydraulics 4FM RE 91 12/4. Ordering Code Hydraulic fluid Mineral oil, HFD (no code) HF, HF, HFC-Hydraulic fluid (only sizes 71...5) E- 4F M / W xial piston unit Swashplate design, fixed displacement Mode of operation Motor 4F M Size Displacement V g (cm 3 ) 22 28 4 56 71 125 25 5 Series Index Sizes 22...56, 125...5 3 Size 71 1 Sizes 22...56 2 Sizes 71...5 Direction of rotation Viewed on shaft end alternating W Seals NR (Nitril-caoutchouc), shaft sealing in FKM (Fluor-caoutchouc) Sizes 22...56 N Sizes 71...5 P FKM (Fluor-caoutchouc) Sizes 71...5 V Shaft end 22 28 4 56 71 125 25 5 Splined shaft SE S Splined shaft SE Splined shaft DIN 548 Z Parallel with key DIN 6885 P Mounting flange 22 28 4 56 71 125 25 5 SE 2-hole C ISO 4-hole ISO 8-hole H Service line connections 22...4 56 71...5 Ports, : SE at rear (with metric fixing screws) 1 Ports, : SE at side (on opposite sides) (with metric fixing screws) 2 = available = available on enquiry = not available
RE 91 12/4. 4FM Mobile Hydraulics osch Rexroth G 3/12 echnical 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 922 (mineral oil), RE 9221 (environmentally acceptable hydraulic fluids) and RE 9223 (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). he sizes 22..56 are not suitable for operation with HF, HF and HFC. 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: ν opt = operating viscosity 16...36 mm 2 /s referred to the loop temperature (closed circuit) or tank temperature (open circuit). Viscosity limits he limiting values for viscosity are as follows: Size 22...56 ν min =5 mm 2 /s, short term at a max. permissible temp. of t max = 115 C ν max = 1 mm 2 /s, short term on cold start (t min = -4 C) Size 71...5 ν min = 1 mm 2 /s, short term at a max. permissible drain temp. t max = 9 C ν max = 1 mm 2 /s, short term on cold start (t min = -25 C) Please note that the max. fluid temperature is also not exceeded in certain areas (for instance bearing area). t temperature of -25 C up to -4 C special measures may be required for certain installation positions, please contact us. 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. he hydraulic fluid should be selected so that within the operating temperature range, the operating viscosity lies within the optimum range (ν opt ) (see shaded section of the selection diagram). We recommend that the highest possible viscosity range should be chosen in each case. Example: t an ambient temperature of X C the operating temperature is 6 C. Within the operating viscosity range (ν opt ; shaded area), this corresponds to viscosity ranges VG 46 or VG 68. VG 68 should be selected. Important: he 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 9 C for sizes 71...5. 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. Filtration he finer the filtration the better the achieved purity grade of the pressure fluid and the longer the life of the axial piston unit. o ensure the functioning of the axial piston unit a minimum purity grade of: 9 to NS 1638 18/15 to ISO/DIS 446 is necessary. t very high temperatures of the hydraulic fluid (9 C to max. 115 C, not permissible for sizes 71...5) at least cleanless class 8 to NS 1638 17/14 to ISO/DIS 446 is necessary. If above mentioned grades cannot be maintained please consult supplier. Selection diagram viscosity ν in mm 2 /s 25-4 -2 2 4 6 8 1 1 1 1 6 4 VG 22 VG 32 VG 68 VG 46 VG 1 1 36 2 1 16 ν opt. 5 5-4 -25-1 1 3 5 7 9 115 temperature t in C t min = -4 C fluid temperature range t max = +115 C
4/12 osch Rexroth G Mobile Hydraulics 4FM RE 91 12/4. echnical Data valid for operation with mineral oils Installation and Commissioning Guidelines Flushing of the bearings (Sizes 125...5) operating conditions, flushing quantities and notes on bearing flushing see RE 92 5 (4VSO). Operating pressure range Maximum pressure at port or (Pressure data to DIN 24312) Size 22...56 71...5 Nominal pressure p N bar 1 ) 35 Peak pressure p max bar 45 1 ) 1 ) Size 28 with S-shaft: 315/35 bar he summ of the pressures at ports and may not exceed 7 bar. Direction of flow clockwise rotation to Symbol Size 22...56, Service line ports 1, 2 Case drain (1 port plugged) Size 71...5, Service line ports M,M Pressure gauge, working pressure, R(L) Case drain, ir bleed (1port plugged) U Flushing port (Sizes71...5) Case drain pressure p abs (bar) 6 5 4 3 2 anti-clockwise rotation to Case drain pressure he max. permissible leakage pressure (housing pressure) is dependent on speed (see diagram). he pressure in the housing must be equal to or greater than the external pressure on the shaft sealing ring. Max. leakage pressure (housing pressure) p abs. max. 6 bar (sizes 22...56) 4 bar(sizes71...5) leakage line to the tank is necessary. Size 25 Size 5 Sizes 22, 28 Sizes 4, 56 Size 71 Size 125 U M 1 M 2 R(L) General t 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. t a longer standstill the case may discharge via operating line. t new start-up a sufficient filling of the housing has to be granted. he 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...5: Optional, at vertical installation position bearing flushing is recommended at port U (as to RD 925) 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 Operate motor at low speed till motor system is completely filled up Minimum immerson depth of the drain line in the tank: mm (relative to the min. oil level in the tank). 2 1 1 Installation on top of tank level Motor on top of min. oil level in the tank ctions as installation below tank level Note: installation position "drive shaft up" for sizes 22...56 not permissible 2 1 1 2 2 1 1 3 5 speed n (rpm)
RE 91 12/4. 4FM Mobile Hydraulics osch Rexroth G 5/12 echnical Data valid for operation with mineral oil able of values (theoretical values, without considering η mh and η v ; values rounded) Size 22 28 4 56 71 125 25 5 Displacement V g cm 3 22 28 4 56 71 125 25 5 Max. speed n max continuous rpm 425 425 3 3 2 2 18 n max interm. 1 ) rpm 5 5 5 45 Max. flow (at n max ) q V max L/min 93 119 16 22 227 325 55 9 orque constants K Nm/bar,35,445,64,89 1,13 1,99 3,97 7,95 orque (at p = bar) max Nm 14 178 255 356 395 2 ) 696 2 ) 1391 2 ) 2783 2 ) Filling volume L,3,3,4,5 2, 3, 7, 11, Moment of inertia about drive axis ctual starting torque at n = rpm ( p = 35 bar) J kgm 2,15,15,43,85,121,3,959,3325 Nm (approx.) 32 564 1127 Weight (approx.) m kg 11 11 15 21 34 61 12 1 ) Intermittent max. speed at overspeed: p = 7 15 bar 2 ) p = 35 bar Calculation of size Flow q v = V g n 1 η v in L/min q V 1 ηv Output speed n = V g p η mh Output torque = in Nm 2 π V g V g = geometric displacement per rev. in cm 3 p = pressure differential in bar n = speed in rpm η v η mh η t = volumetric efficiency = mech.-hyd. efficiency = overall efficiency = K p η mh n 2 π n Output power P = = in kw 9549 6 q v p η = t Output drive permissible axial and radial loading on drive shaft Size 22 28 4 56 Distance of F q F q a mm 17,5 17,5 17,5 17,5 (from shaft shoulder) b mm 3 3 3 3 a, b, c c mm 42,5 42,5 42,5 42,5 Max. permissible radial force at distance a F q max N 25 25 3 5 b F q max N 1 115 289 446 c F q max N 1 83 2416 3398 Max. permissible axial load - - F ax max N 1557 1557 212 291 F ax + + F ax max N 417 417 88 149 Size 71 125 25 5 Max. axial force at housing pressure p max 1 bar abs. F q ± F ax max N 1 19 3 Max. axial force at housing pressure p max 4 bar abs. ± F ax + F ax max N 81 15 185 25 X/2 X/2 F ax max N 199 275 415 55 X Max. radial force F q max N 17 25 5
6/12 osch Rexroth G Mobile Hydraulics 4FM RE 91 12/4. Flow and Drive orque Size 71 Size 5 flow q V (L/min) 3 1 n = 15 rpm n = 3 rpm q V 3 1 drive torque (Nm) flow q V (L/min) 1 13 1 11 n = 1 rpm n = 18 rpm 28 2 2 2 drive torque (Nm) Size 125 flow q V (L/min) 7 5 1 3 35 n = 15 rpm n = 2 rpm p (bar) 7 5 drive torque (Nm) 1 9 8 7 5 q V 18 1 1 1 1 3 q V 3 8 3 1 1 Size 25 flow q V (L/min) 1 3 35 p (bar) 7 5 n = 15 rpm n = 2 rpm q V 1 1 1 8 drive torque (Nm) 1 1 3 35 p (bar) 3 1 1 3 35 p (bar) (Fluid: Hydraulic oil ISO VG 46 DIN 51519, t = 5 C)
RE 91 12/4. 4FM Mobile Hydraulics osch Rexroth G 7/12 Unit Dimensions, Size 22, 28 efore finalising your design, please request a certified drawing. (SE ), M8; 15 deep Connections, Service line ports SE 1 / 2 " 42 bar ( psi) high pressure series 1, 2 Leakage port / oil filling port M18x1,5; 12 deep Shaft ends S Splined shaft SE 7 / 8 ", 3 pressure angle, 13 teeth, 16/32 pitch, flat root, side fit, tolerance class 5 NSI 92.1a-1976 ø55 5/16-18UNC-2 33 25 6 19 ø17,7 Splined shaft SE 1" 3 pressure angle, 15 teeth, 16/32 pitch, flat root, side fit, tolerance class 5 NSI 92.1a-1976 ø55 3/8-16UNC-2 38 3 7,5 22 ø2,8 41,3 46
8/12 osch Rexroth G Mobile Hydraulics 4FM RE 91 12/4. Unit Dimensions, Size 4 efore finalising your design, please request a certified drawing. 1, 1 (SE ) 2 M1; 17 deep 2 Connections, Service line ports SE 3 / 4 " 42 bar ( psi) high pressure serie, 1, 2 Leakage port / oil filling port M18x1,5; 15 deep Shaft ends Z Splined shaft W 3x2x3x14x9g DIN 548
RE 91 12/4. 4FM Mobile Hydraulics osch Rexroth G 9/12 Unit Dimensions, Size 56 efore finalising your design, please request a certified drawing. 12,7 7 18 82 155,4 1 213 181 61 1 ø127 (SE C) 48 X 18 32 15 48 ; 2 25,4 61 Connections, Service line ports SE 3 / 4 " 42 bar ( psi) high pressure serie, 1, 2 Leakage port / oil filling port M 18x1,5 ; 12 deep 23,8 158 75 58 15 58 2 View X 5,8 ø19 M1; 17 deep Shaft ends Z Splined shaft W 3x2x3x14x9g DIN 548
1/12 osch Rexroth G Mobile Hydraulics 4FM RE 91 12/4. Unit Dimensions, Size 71 efore finalising your design, please request a certified drawing. 8 34 R(L) port plate 1 ø15 ø14h8 61 M X 83.5 43 12h9 ø18 17 183 2 132 263 M 45 83.5 17 176 45 Y port plate 2 View Y port plate 1 View X ø25 M M 87.5 87.5 27.8, ø25 57.2 M12; 17 deep 37.5 37.5 27.8 27.8 224 to mounting flange267 Y M12; 17 deep 57.2 Connections, service line ports SE 1" (high pressure series) R (L) oil filling and bleed M27x2 oil drain (plugged) M27x2 M, M measuring port for pressure (plugged) M14x1,5 Shaft end P Parallel shaft with key S 12x8x68 DIN 6885 ø4k6 M12 1,5 68 9,5 Z Splined shaft W4x2x3x18x9g DIN 548 M12 45 37 9,5 28 66 7 8 28 R1,6 55
RE 91 12/4. 4FM Mobile Hydraulics osch Rexroth G 11/12 Unit Dimensions, Size 125 efore finalising your design, please request a certified drawing. 8 36 29 R(L) port plate 1 12 ø2 U M 98.5 14h9 ø ø16h8 74 X 53.5 14 213 M 45 45 24 156 299 98.5 26 Y port plate 2 View Y port plate 1 View X ø32 M M 12.5 12.5, 31.8 ø32 66.7 M14; 19 deep 41.5 41.5 31.8 31.8 261 to mounting flange 35 Y M14; 19 deep 66.7 Connections, service line ports SE 1 1 / 4 " (high pressure series) R (L) oil filling and bleed M33x2 oil drain (plugged) M33x2 M, M measuring port for pressure (plugged) M14x1,5 U Flushing port, M14x1,5 flushing of the bearings (plugged) Shaft end P Parallel shaft with key 14x9x8 DIN 6885 ø5k6 M16 1,5 8 36 12 78 82 92 Z Splined shaft W5x2x3x24x9g DIN 548 M16 54 45 12 R2,5 36 64
12/12 osch Rexroth G Mobile Hydraulics 4FM RE 91 12/4. Unit Dimensions, Size 25 efore finalising your design, please request a certified drawing. 8 48 16 R(L) port plate 1 129 ø24 U M 131 18h9 ø28 ø224h8 91 X 64 34.5 265 273 M 45 45 3 23 378 124.5 26 268 M M Y port plate 2 132.5 132.5 36.5 View Y, ø38 79.4 M16; 21 deep port plate 1 View X 36.5 5.5 5.5 333 to mounting flange Shaft end P Parallel shaft with key S 18x11x1 DIN 6885 ø6m6 M2 Y 385 3 1 15 42 11 15 115 38 79.4 M16; 21 deep Connections, service line ports SE 1 1 / 2 " (high pressure series) R (L) oil filling and bleed M42x2 oil drain (plugged) M42x2 M, M measuring port for pressure (plugged) M14x1,5 U Flushing port, M14x1,5 flushing of the bearings (plugged) Z Splined shaft W6x2x3x28x9g DIN 548 M2 7 59 15 R4 42 8