A10FM / SERIES 52 / NG 045

A10FM 45 Rexroth Axial Piston Motor

Vg 44.5 cm³p 280 / 350 barn 4000 rpmM 198 Nmm 17 kg

A fixed, swashplate-design motor for drives that have to hold torque under load. Here is its working range laid out the way a selection engineer reads it: torque against pressure, flow against speed, then the parameter register.

Torque against pressure

M = Vg × Δp / 20π · full displacement · η = 1

100 bar	70.8 Nm
150 bar	106.3 Nm
200 bar	141.7 Nm
250 bar	177.1 Nm
280 bar nominal	198 Nm

Published value at 280 bar: 198 Nm. Starting torque at standstill is lower, about 170 Nm.

Flow against speed

qv = Vg × n / 1000 · ηv = 1

500 rpm	22.3 L/min
1000 rpm	44.5 L/min
2000 rpm	89.0 L/min
3000 rpm	133.5 L/min
4000 rpm maximum	178 L/min

Published value at top speed: 178 L/min, 83.1 kW at 280 bar.

Parameter register

Displacement, geometric	44.5 cm³/rev (2.71 in³)
Nominal pressure / maximum pressure	280 bar / 350 bar
Speed at full displacement	4000 rpm
Torque / starting torque at 280 bar	198 Nm / ≈170 Nm
Shaft rigidity R / W / C	46859 / 38489 / 46546 Nm/rad
Rotary group inertia	0.0033 kgm²
Maximum angular acceleration	4000 rad/s²
Shaft loading, axial / radial	1500 N / 1500 N
Case volume / mass	0.7 L / 17 kg
Rate of pressure change, permitted	16000 bar/s

Operating window

FLUID

HLP oil to DIN 51524, 20/18/15 ISO 4406 or cleaner; 19/17/14 below 10 mm²/s at the drain port.

VISCOSITY

16–36 mm²/s for peak efficiency; 400–10 mm²/s in service; 7 mm²/s short term; 1600 mm²/s cold start.

PRESSURE FLOOR

10 bar absolute minimum on the loaded port; 2 bar absolute on the return side; 2 bar absolute static at L / L1.

THERMAL CEILING

110 °C maximum fluid temperature, measured at port LX, with FKM sealing material.

Selection questions

At what pressure does the 45 reach 150 Nm?

Solving the torque formula for pressure gives about 212 bar at full displacement, in theory. Real systems sit slightly higher because the mechanical-hydraulic efficiency is always below one, so plan the duty point a little above that figure.

37 or 45 - same housing, different motor?

Identical 17 kg frame and identical shaft stiffness; what changes is the rotating group. The 45 buys roughly 21 % more torque and gives up about 5 % of top speed, so the choice comes down to whether the drive is torque-limited or speed-limited.

Does the motor tolerate sudden load reversals?

Pressure may build up or decay at up to 16000 bar/s and angular acceleration is released to 4000 rad/s². Circuits that reverse quickly are therefore acceptable, provided the pressure floors are respected and the return side cannot collapse.

Specify an A10FM 45

Send rotation, shaft end, port style, valve and sensor options plus quantity for a confirmed designation, price and delivery time.

Request quotation

SOURCE  Bosch Rexroth RE 91172/2023-11-02, A10FM / A10FE series 52

NOTE    theoretical and rounded, efficiency and tolerances excluded; nameplate and delivery documents govern

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