About this product 19/60
RE 91616-01-B/10.2014, A6VE Series 65 and 71, Bosch Rexroth AG
5.2.2 Functional description
A hydraulic motor converts hydrostatic energy into mechanical energy. Hydraulic fluid
is directed via the port plate (4) and the lens plate (5) to the cylinder bores.
The pistons(7) in the cylinder bores execute a stroke that is converted into rotary
movement by the piston on the drive shaft flange. During this process, the pistons
move the cylinder (6) and generate an output torque at the drive shaft. The output
torque increases with the pressure difference between the high- and low-pressure
sides and increasing displacement. The output speed is proportional to the inward
flow and inversely proportional to the displacement of the hydraulic motor.
The flushing and boost pressure valve is used to remove heat from the hydraulic
circuit. In an open circuit, it is used exclusively for flushing the case. In a closed
circuit, it ensures a minimum boost pressure level in addition to the case flushing.
Hydraulic fluid is directed from the respective low pressure side into the motor case.
This is then fed into the reservoir, together with the case drain fluid. The hydraulic
fluid removed from the closed circuit must be replaced by cooled hydraulic fluid
from the boost pump.
The swivel angle of the bent-axis rotary group is steplessly variable. With two-point
control (HZ, EZ), the swivel angle can be switched from maximum to minimum angle.
Control of the swivel angle of the bent-axis rotary group changes the piston stroke
and therefore the displacement. The swivel angle is changed hydraulically via the
stroke piston(3). Here, the cylinder is swiveled including the pistons and lens plate.
The lens plate is mounted for easy motion in a guideway. Increasing the swivel angle
results in an increase in the displacement and specific torque; decreasing the swivel
angle results in a corresponding decrease of these values. The output speed is
dependent on the input flow and the displacement of the hydraulic motor.
Various control devices are available depending on requirements. Information
about this can be found in data sheet 91615 and 91616.
Motor function
Flushing and boost
pressure valve (optional)
Control
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