Bosch Rexroth | AA2FM4561W-VSD527
AA2FM45/61W-VSD527
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The AA2FM45/61W-VSD527 motor is manufactured by Bosch Rexroth within the A2FM Fixed Motors series and serves hydrostatic transmissions where compact fixed-displacement output is required. Its displacement is 45.6 cm³ per revolution, which sets the volume of hydraulic fluid the motor transfers each rotation. Continuous operation is rated at a maximum speed of 5600 rpm, supporting high shaft speeds in mobile or industrial drives. For brief acceleration events the allowed intermittent speed rises to 6200 rpm so short load peaks can be handled without damage. The motor withstands a maximum pressure of 450 bar, and its nominal pressure limit of 400 bar defines the recommended continuous working range. Because torque rises proportionally to pressure, a torque constant of 0.725 Nm per bar simplifies predicting drive output. At the nominal 400 bar the shaft delivers 290 Nm, providing a direct value for system sizing. A low rotary inertia of 0.0024 kg·m² enables fast speed changes while minimizing control effort.
The internal case volume measures 0.45 L, accommodating leakage oil and helping dissipate heat inside the housing. Bidirectional rotation lets designers implement reversible circuits without additional flow dividers. A drain port with an M18×1.5 thread gives a standardized connection for the return line. When turning at the rated speed the unit processes up to 255 L/min, a flow rate that must be matched by the pump and pipework. Drain housing pressure shall not exceed 10 bar, preventing premature wear of shaft seals. The shaft tolerates radial forces up to 8150 N so belt or gear side loads can be applied directly. Permissible axial thrust is 7.0 N per bar of operating pressure, guiding selection of coupling methods. FKM sealing material ensures compatibility with common hydraulic fluids at elevated temperatures.
Technical Specifications
Case Volume
0.45 L
Direction Of Rotation
Bidirectional
Displacement
45.6 cm³/rev
Drain Port Thread
M18x1.5
Max Flow (at Nmax)
255 L/min
Max Housing Pressure
10 bar
Max Radial Shaft Force
8150 N
Max Speed
5600 rpm
Max Speed (intermittent)
6200 rpm
Maximum Pressure
450 bar
Nominal Pressure
400 bar
Permissible Axial Force/bar
7.0 N/bar
Rotary Inertia (j)
0.0024 kg·m²
Seal Material
FKM
Torque At 400 Bar
290 Nm
Torque Constant
0.725 Nm/bar
1620 Old Apex Road
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