Company Registered in England No: 4167649 VAT Registration No: 732 5692 25 BS EN ISO 9001:2008 No: LRQ 0964389
+44 (0)1204 699 959
Hyquip Limited New Brunswick Street Horwich Bolton Lancashire BL6 7JB UK
www.hyquip.co.uk
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18/56 Product
description
Bosch Rexroth AG
, A6VE Series 63, RE 91606-01-B/07.2013
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 (
6
) to the cylinder bores. The
pistons (
8
) in the cylinder bores execute a stroke which is converted into rotation by
the piston at the drive shaft flange. During this process, the pistons move the
cylinder (
7
) 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 (
2
) is used to remove heat from the hydraulic
circuit. In an open circuit, it is used only for flushing the housing. 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 housing. This is
then fed into the reservoir, together with the case drain fluid. The hydraulic fluid,
removed out of the closed circuit must be replaced by cooled hydraulic fluid from
the boost pump.
The swivel angle of the bent axis rotary group can be steplessly varied. 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 controlled hydraulically by
the stroking piston (
3
). The cylinder including piston and lens plate is swiveled
thereby. 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 sheets 91606 and RE 91604 (variable
motor A6VM).
The following warning concerns all axial piston units with the control part EP:
CAUTION
The spring feedback in the control part is not a safety device!
Internal contamination (contaminated hydraulic fluid, abrasion or residual
contamination from system components) can cause the control part to stick in
an undefined position. As a result, the volume flow of the axial piston unit will no
longer respond correctly to the operator's commands.
▶
Check whether the application on your machine requires additional safety
measures, in order to bring the driven consumer into a safe position
(immediate stop)
.
If necessary, make sure that these are properly implemented.
Motor function
Flushing and boost
pressure valve (optional)
Control
