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A2FO series 70 | About this product
Open circuit
Pump function
Bosch Rexroth AG, RE 91405-01-B/2021-05-21
5 About this product
5�1 Performance description
The axial piston fixed pump generates a hydraulic fluid flow. It is designed for mobile
and stationary applications.
Refer to data sheet 91405 and the order confirmation for the technical data,
operating conditions and operating limits of the axial piston unit.
5�2 Product description
The A2FO is a fixed pump with axial tapered piston rotary group in bent-axis
design for hydrostatic drives in open circuits. Flow is proportional to drive speed
and displacement. For axial piston units with bent-axis design, the pistons (2) are
arranged at an angle to the drive shaft (1).
In an open circuit, the hydraulic fluid flows from the reservoir to the hydraulic pump
from where it is fed to the consumer, for example, hydraulic motor. From the
consumer, the hydraulic fluid flows directly back to the reservoir.
5�2�1 Axial piston unit layout
1
7
Fig� 2: Layout of the A2FO series 70
1 Drive shaft
2 Piston
3 Cylinder
5�2�2 Functional description
Torque and a rotational speed are applied to the drive shaft (1) by an drive motor.
By way of the drive shaft and the pistons (2), cylinder (3) is set in rotation.
The cylinder then glides on the control plate (6). With every revolution, the pistons
execute one stroke in the cylinder bores. During a rotation, each piston moves over
the bottom and top dead centers back to its initial position. Here, hydraulic fluid is
fed into and out through two control slots in the control plate according to the
displacement. Hydraulic fluid flows into the piston chamber as the piston recedes on
the suction side (5). At the same time, on the pressure side (4) the hydraulic fluid is
pushed out of the cylinder chamber into the hydraulic system by the pistons.
2
3
4
5
6
4 Pressure side
5 Suction side
6 Control plate
5
7 Drive shaft flange
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