Bosch Rexroth A15VSO User Manual

About this product 19/60
RE 92801-01-B/11.2018, A15VSO/A15VLO Series 11, BoschRexrothAG
5.2.2 Functional description
Torque and rotational speed are applied tothe drive shaft(1) byadrive motor. The
drive shaft isconnected tothe cylinder (9) bysplines, causing the cylinder torotate.
With every revolution, the pistons(10) perform astroke inthe cylinder bores, the
size ofwhich depends onthe pitch ofthecradle(12). The slipper pads(11) are held
onwith the pistons and guided along the glide surface ofthecradle 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. Hydraulic fluid
isfed into and out through two control slots inthe control plate(7) according
todisplacement. Hydraulic fluid flows into the piston chamber asthepiston recedes
onthe suction side (8). At the same time, the hydraulic fluid ispushed out
ofthecylinder chamber into the hydraulic system bythepistons onthe high-
pressure side (3).
The swivel angle ofthecradle(12) isinfinitely variable. 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. The cradle
ismounted inswivel bearings for smooth operation, and itiskept inbalance
bytheopposed piston (not illustrated). 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 92801.
The axial piston unit A15VLO isequipped with acharge pump(4). The charge pump
(impeller) isacentrifugal pump with which the pump isfilled and can beoperated
athigher rotational speeds. This also simplifies cold starting atlow temperatures
and high viscosity ofthehydraulic fluid. Externally increasing the inlet pressure
istherefore unnecessary inmost cases. Charging the reservoir with compressed air
isnot permissible.
M
A
A P
V
g min
V
g max
S M T
2
T
3
T
1
4
Fig. 3: Circuit diagram A15VLO with charge pump
Pump function
Control
Charge pump (optional)

Bosch Rexroth A15VSO Specifications

General

Brand	Bosch
Model	Rexroth A15VSO
Category	Water Pump
Language	English