Functional Description - Bosch Rexroth A10VSNO Instruction Manual

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Pump
Control
Bosch Rexroth AG, A10VO, A10VSO, A10VSNO Series 32, RE 92714-01-B/04.2018
5.2.2

Functional description

Torque and rotational speed are applied to the drive shaft (1) by a drive motor. The
cylinder (9) is picked up and turned by the splines of the drive shaft. With every
revolution, the pistons (12) execute a stroke in the cylinder bores, the size of which
depends on the pitch of the cradle (14). The slipper pads (13) are held on with the
pistons and guided along the glide surface of the cradle by the retaining plate (2).
The cradle setting during a rotation causes each piston to move over the bottom and
top dead centers and back to its initial position. Here, hydraulic fluid is fed in and
drained out through the two control slots in the control plate (6) according to the
stroke displacement. On the suction side (8) hydraulic fluid flows into the piston
chamber as the piston recedes. At the same time, on the high-pressure side (5) the
fluid is pushed out of the cylinder chamber into the hydraulic system by the pistons.
The swivel angle of the cradle (14) is infinitely variable. Adjusting the swivel angle
changes the piston stroke and, with it, the displacement. The swivel angle is
controlled hydraulically by means of the stroking piston. The cradle is mounted in
swivel bearings for smooth operation and it is kept in balance by the opposed piston
(3). 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 92705, 92714, 92740 and 92709.