Bosch rexroth 1 Series - 5.2.2 Functional description

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
11121516
17
7 8
6
4
2
5 11 12 15 1614
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