About this product 21/68
RE 93100-01-B/2019-09-10, A20V(L)O Series 1,
Bosch Rexroth AG
1
2
4
6
7
5
8
9
10
11
12
15
16
17
7 8
6
4
2
5 11 12
15 16
14
14
13
13
Fig. 3: Layout of A20VO, size 520
1
Drive shaft
2
Retaining plate
3
Opposed piston
4
Swivel angle indicator
5
Suction side
6
Pilot control valve
7
Control valve
8
Control plate
(distributor plate)
9
Suction port
10
High-pressure side
11
Cylinder
12
Piston
13
Stroking piston
14
Slipper pad
15
Sliding disc
16
Cradle / swashplate
17
Through drive
5.2.2 Functional description
Torque and rotational speed are applied to the drive shaft (
1
) by a drive motor. The
cylinder (
11
) is picked up and turned by the splines of the drive shaft. With every
revolution, the pistons (
12
) complete a stroke in the cylinder bores, the size of which
depends on the pitch of the cradle (
16
). The slipper pads (
14
) are held on with the
pistons and guided along the glide surface of the cradle and/or the sliding disc (
15
)
by the retaining plate (
2
). The pitch of the swashplate during a revolution causes
each piston to move over the bottom and top dead centers and back to its initial
position. During this sequence, hydraulic fluid is fed in and drained out through the
two control slots in the control plate (
8
) according to displacement. On the suction
side (
5
) hydraulic fluid flows into the piston chamber as the piston recedes. At the
same time, on the high-pressure side (
10
) the hydraulic fluid is pushed out of the
cylinder chamber into the hydraulic system by the pistons.
The swivel angle of the cradle (
16
) is continuously adjustable. Controlling
the swashplate swivel angle changes the piston stroke and, therefore,
the displacement. The swivel angle is controlled hydraulically by means
of the stroking piston. Increasing the swivel angle increases the displacement;
reducing the angle reduces displacement accordingly.
Various control devices are available depending on requirements. Information
about this can be found in data sheet 93100.
Pump
Control
