About This Product; Performance Description; Product Description; Axial Piston Unit Layout - Bosch rexroth A4VSH Series Instruction Manual

20/64 A4VSH series 1x and 30 | About this product
Semi-closed circuit
Bosch Rexroth AG, RE 92110-01-B/2022-03-22

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 stationary applications.
Refer to data sheet 92110 and the order confirmation for the technical data,
operating conditions and application limits of the axial piston unit.
5�2 Product description
A4VSH is a variable pump with an axial piston rotary group in swashplate design
for hydrostatic drives in semi-closed circuits. Flow is proportional to drive speed
and displacement. The flow can be changed steplessly by controlling the
swashplate (cradle) (11). For axial piston units with swashplate design,
the pistons (9) are arranged axially relative to the drive shaft.
In the semi-closed circuit, the hydraulic fluid flows from the hydraulic pump to the
consumer, then directly back to the hydraulic pump. There is then a high-pressure
side (5) and a low-pressure side (6), which can change according to loading.
Missing hydraulic fluid and related cavitation in the respective low-pressure side is
compensated for by anti-cavitation valves.
5�2�1 Axial piston unit layout
1
11
Fig� 2: A4VSH layout
1 Drive shaft
2 Retaining plate
3 Stroking piston
4 Control plate
(Distributor plate)
3
2
10 9 8
5 Pressure side B with
anti-cavitation valve
6 Pressure side A with
anti-cavitation valve
7 Port plate
4
5
6
7
8 Cylinder
9 Piston
10 Slipper pad
11 Swashplate
(Cradle)