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Product description
Closed circuit
Bosch Rexroth Corporation, A21VG Series 10, RE 93223-01-B/09.2020
5 Product description
5.1 Performance description
The axial piston variable double pump generates, controls and regulates a
hydraulic-fluid flow. It is designed for mobile applications such as construction
machinery.
Refer to data sheet 93223 and the order confirmation for the technical data,
operating conditions and operating limits of the axial piston unit.
5.2 Product description
The A21VG is a variable double pump with two axial piston rotary groups in
swashplate design for hydrostatic drives in closed circuits. The two flows are
proportional to the drive speed and the displacement. The flow can be steplessly
changed by controlling the cradle (11). Both circuits can be adjusted independent
of one another. For axial piston units with swashplate design, the pistons are
arranged axially with respect to the drive shaft.
In the closed circuit, the hydraulic fluid flows from the hydraulic pump to the
consumer (e.g. the 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 Assembly of the axial piston unit
3
2
1
11
10
12
Fig. 2: Assembly of the A21VG
1
Drive shaft
Retainer plate
2
3
Controller (using the ET
as an example here)
4
4
5
7
9
8
6
6
8 9
4
Stroking piston
High-pressure side
5
6
Low-pressure side
7
Control plate
8
Cylinder
3
2
11
10
12
9
Piston
10 Slipper pad
11 Cradle
12 Angle Sensor
(optional)
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