Electric Drives and Controls Linear Motion and Hydraulics I Assembly Technologies I Pneumatics I Service Rexroth Bosch Group External Gear Motors AZMF ..., AZMN ..., AZMG ... Contents Page Motors with integral Valves and Sensors 9 Design calculations for Motors 10 General Rexroth external gear motors are produced in 3 different models, with different displacements being produced by means of gears of differing widths. Different versions of motors are achieved by the use of different flanges, shafts, valves and integrated speed sensors. Features - High pressures combined with small size and low weight - Large speed ranges - Broad viscosity and temperature ranges - Reversible motors for 2- and 4-quadrant operation Fields of application - Road construction machines as road rollers and pavers - Agricultural machines and forestry technology as harvesters and forestry machines - Street vehicles such as busses, trucks and special vehicles and above all in hydrostatic fan drives.

External gear motors Function If pressurized oil is fed into the motor, a torque can be obtained from the shaft leading out of the housing. Here, a distinction is made between motors that rotate on one direction and reversible motors. External gear motors that rotate in one direction These are of asymmetrical design, i.e. the high and low pressure sides are defined and not interchangeable at will. In this case, reversible operation is not possible. In order to ensure a high efficiency level, a special running-in method is used for motors. Leakage oil is discharged internally to the outlet side....

External gear motors I RE 14 026/05.09 Hydraulics I Bosch Rexroth AG 3/40 Product overview “Model F” preferential range

4/40 Bosch Rexroth AG I Hydraulics External gear motors I RE 14 026/05.09 Special design*) *) The special equipments partly contained on the pages 20-35, are not considered in the representation of the ordering code. Drive shafts Front cover Port connections Tang drive Tapered keyed shaft 1 : 5 for flange A Square flange Centring 0 80 mm Square flange Centring 0 36.47 mm Outboard bearing 0 80 mm, Type 1 Rectangular flange 4-bolt mounting 0 52 mm, with O-ring

External gear motors I RE 14 026/05.09 Hydraulics I Bosch Rexroth AG 5/40 Special design Size (N) Rear cover Standard Special design Direction of rotation Seals Right Left Drive shafts Front cover Port connections suitable front cover Tapered keyed shaft 1 : 5 Square flange Centring 0 100 mm External Gear Motors Model “G” AZ Special design Rear cover Standard Special design Direction of rotation NBR = M Right = R Left = L Universal = U Drive shafts Front cover Port connections suitable front cover Tapered keyed shaft 1 : 5 Tang drive Square flange Centring 0 105 mm 2-bolt...

External gear motors Drive shaft model “F” Drive shaft model “N” **) in combination with front cover Ǣ B P **) in combination with front cover Ǣ Motor without shaft seal Drive shaft model “G” min. 14.8 usable shaft length

External gear motors Front cover model “F” Front cover model “N” .5

8/40 Bosch Rexroth AG I Hydraulics External gear motors I RE 14 026/05.09 Port connections 20 Rectangular flange

External gear motors External gear motors with integrated valves, sensors Pages 31, 32 Gear motor with integrated, pilot-operated proportional pressure relief valve and rotary shaft seal relieved of load thanks to the three-chamber design. The use of gear motors without this relief of the rotary shaft seal is not recommended due to the loads from the oil return line, particularly when the oil is cold. The basis of this drive unit is a motor model “F”. The pilot proportional pressure relief valve is integrated in the rear end cover. This unit has the following advantages: – No pipework necessary...

External gear motors Design calculations for motors It is also necessary to allow for different efficiencies such as: The design calculations for motors are based on the following parameters: V Q p M n P ηv Volumetric efficiency ηhm Mechanical-hydraulic efficiency ηt Total efficiency Displacement Inlet flow rate Pressure (p1, pA) Output torque Output speed Output power The following formulas describe the various relationships. They include correction factors for adapting the parameters to the usual units encountered in practice. Note: Diagrams providing approximate selection data can be found...

External gear motors

External gear motors Q = f ( n,V ) incl. ηv P = f ( n, p) incl. ηt incl. ηhm M = f ( n, p)

External gear motors Q = f ( n,V ) incl. ηv P = f ( n, p) incl. ηt incl. ηhm M = f ( n, p)

External gear motors Specifications General Construction Mounting Port connections Direction of rotation (looking on shaft) Mounting position Load on shaft Ambient temperature range Fluids Viscosity Fluid temperature range Filter ***) external gear motor Flange or through-bolting with spigot screw, flange One direction of rotation or reversible any radial and axial forces after consulting –30 °C...+80 °C with NBR seals*) –20 °C...+110 °C with FPM seals**) mineral oil-based hydraulic fluids to DIN/ISO, other fluids upon request 12…800 mm2/s permitted range 20…100 mm2/s recommended range 12…2,000...

External gear motors Model F Displacement max. continuous pressure p1 max. starting pressure p2 min. rotational speed max. rotational speed p1 Motor outlet pressure pA Leakage-oil line pressure pL Model N Displacement max. continuous pressure p1 max. starting pressure p2 min. rotational speed max. rotational speed p1 Motor outlet pressure pA Leakage-oil line pressure pL Model G Displacement max. continuous pressure p1 max. starting pressure p2 min. rotational speed max. rotational speed p1 Motor outlet pressure pA Leakage-oil line pressure pL On request *) Short-term when starting 10 bar drive...