RE 90300-B/2021-01-19, Bosch Rexroth AG
Installation |
Axial piston units
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• Torsional vibrations and speed variations may cause leaks in the shaft seal and
increased rotary angular acceleration of the rotary group of the axial piston unit.
At risk are diesel drives with a small number of cylinders and low flywheel mass
and toothed belt or V-belt drives. Belts can lose much of their pre-charge pressure
after just a short operating time.
An automatic clamping device can lessen the speed variations and vibrations, and
thus avoid subsequential damage.
– When using drives with toothed belts or V-belts, always use an automatic
clamping device.
• On the drive of an axial piston unit, a cardan shaft may cause vibrations
and excessive rotary angular acceleration. Depending on the frequency and
temperature, this may cause leaks in the shaft seal and damage the rotary group.
• If a shared drain line is used for several units, make sure that the respective case
pressure in each unit is not exceeded. The shared drain line must be dimensioned
to ensure that the maximum permissible case pressure of all connected units is
not exceeded in any operating condition, particularly at cold start. If this is not
possible, separate drain line must be laid, if necessary.
The installation method for the axial piston unit depends on the connecting elements
to the drive or output side. The following descriptions explain the installation of the
axial piston unit:
• With a coupling
• On a gearbox
• On a cardan shaft
7.4.4 Installation with a coupling
The following describes how to install the axial piston unit with a coupling:
NOTICE!
Danger from improper handling!
Product can be damaged!
▶ Do not assemble the coupling hub on the drive shaft of the axial piston unit by
striking it.
1.
Assemble the specified coupling half on the drive shaft of the axial piston unit
according to the instructions of the coupling manufacturer.
The drive shaft of the axial piston unit is equipped with a female thread. Use this
female thread to pull the coupling element onto the drive shaft. The size of the
female thread can be seen in the installation drawing.
2.
Make sure that the installation location is clean and free from dirt and foreign
particles.
3.
Clamp the coupling hub onto the drive shaft or ensure permanent lubrication
of the drive shaft. This prevents the formation of frictional corrosion and the
associated wear.
