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About this product
Closed circuit
Bosch Rexroth AG, A4VG Series 40, RE 92004-01-B/05.2017
5 About this product
5.1 Performance description
The axial piston variable pump generates, controls and regulates a hydraulic-fluid
flow. It is designed for mobile applications such as construction machinery.
Refer to data sheet 92004 and the order confirmation for the technical data,
operating conditions and operating limits of the axial piston unit.
5.2 Product description
The A4VG is a variable pump with axial piston rotary group in swashplate design for
hydrostatic drives in closed circuits. The flow is proportional to the drive speed and
displacement. The flow can be changed steplessly by controlling the swashplate
(cradle) (13). For axial piston units with swashplate design, the pistons are arranged
axially relative to the drive shaft.
In the closed circuit, the hydraulic fluid flows from the hydraulic pump to the
consumer, e.g. hydraulic motor and from there directly back to the hydraulic pump.
There is a high-pressure side and a low-pressure side which alternate depending on
which side is under load.
5.2.1 layout of the axial piston unit
2
1
13
Fig. 2: layout of the A4VG Series 40
1 Drive shaft
2 Retaining plate
3 Stroking piston
4 Control unit
(using the EP as
an example here)
4
3
12
11
10
5 Control plate
(distributor plate)
6 High-pressure side
7 Boost pump
8 Low-pressure side
5
6
7
8
9
9 Suction port
10 Cylinder
11 Piston
12 Slipper pad
13 Cradle
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