About This Product; Performance Description; Product Description; Axial Piston Unit Layout - Bosch Rexroth 70 Series Instruction Manual

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About this product

Open circuit
Closed circuit
Bosch Rexroth AG, A2FM/A2FE/A2FMT Series 70, RE 91071-01-B/06.2018
5 About this product

5.1 Performance description

An axial piston fixed motor converts hydrostatic flow into mechanical rotation. It is
designed for mobile and stationary applications.
Refer to data sheets 91071 and 91072, and the order confirmation for the technical
data, operating conditions and operating limits of the axial piston unit.

5.2 Product description

The fixed motor is available in the A2FM standard version and the A2FE plug-in
version. The A2FM/A2FE is a fixed motor with an axial tapered piston rotary group
with a bent-axis design for hydrostatic drives in open and closed circuits. The A2FMT
is a fixed motor with an axial tapered piston rotary group with a bent-axis design
for closed-circuit hydrostatic drum drives in concrete mixer trucks. In axial piston
units with a bent-axis design, the pistons (2) are arranged at an angle to the drive
shaft (1). The pistons rest directly on the drive shaft where they generate torque
depending on the pressure.
In an open circuit, the hydraulic fluid flows from the reservoir to the hydraulic pump,
where it is transported to the hydraulic motor. The hydraulic fluid flows from the
hydraulic motor directly back to the reservoir. The output direction the hydraulic
motor can be changed with a directional valve.
In the closed circuit, the hydraulic fluid flows from the hydraulic pump to the
hydraulic motor, then directly back to the hydraulic pump. The output direction of
the hydraulic motor can be changed, e.g. by reversing the flow direction in the
hydraulic pump.

5.2.1 Axial piston unit layout

1
6
Fig. 2: Series 70 A2FM layout
1 Drive shaft
2 Piston
2
3
4
3 Cylinder
4 Control plate
5
5 Working ports
6 Drive shaft flange