Initial Installation
28
EN 4161.758.101m – 2018-09
4.6
Lubrication
4.6.1
Splash lubrication
The standard B5 version of the gearbox has splash
lubrication.
Splash lubrication is suitable for
intermittent operation. Intermittent
operation requires frequent gear changes,
varying speeds and idle times (e.g. due to
retooling).
Possible damage to gearbox due to insufficient
oil quantity and/or running dry.
The gearbox oil must be filled up to the
middle of the oil sight glass in such
applications.
The actual oil level is all-important when it comes
to filling up with oil. The quantity in liters indicated
on the gearbox model plate is intended as a guide
only.
If the gearbox is installed at an angle – as is the
case in certain belt tensioners – an oil level tube
with calibration mark must be fitted in place of the
oil sight glass.
The oil level in the gearbox must be the same as
for a gearbox installed in horizontal position (also
see installation drawing).
An oil sensor can occasionally be used to
check the oil level before starting the
machine. The oil sensor can be screwed
into connections D or E (Figure, page 30)
of the gearbox housing. (Oil sensor order
no. 4161.298.045, Balluff data sheet
available on request)
4.6.2
Recirculating lubrication
Two connecting pieces (hose fittings) with
M42x1.5 and M22x1.5 thread are optional
accessories, order no. 4161.106.016.
Recirculating lubrication enables efficient gearbox
lubrication and cooling. This improves gearbox
performance and less heat is introduced into the
machine.
Gearbox failure due to insufficient lubrication.
Recirculating lubrication is required for
gearboxes installed in the vertical V1 and
vertical V3 positions.
In the 2K120/2K121 gearboxes, the V1 vertical
and V3 vertical installation positions require
recirculating lubrication. In this instance, the type
of recirculating lubrication depends on the
operating temperature level required.
The centrifugal forces acting on the oil can lead to
insufficient lubrication of the gearing during
continuous direct-drive operation.
Occasionally changing gear (ratio) and then
starting the motor (
n
Mot
=1,000 rpm) supplies oil to
the gearing and prevents one-sided, position-
specific loading of the gearing.
Some applications require a very low operating
temperature level which can be reached by
connecting an adapted gearbox oil supply with
oil cooling. The respective gearbox versions are
prepared accordingly.
The gearbox has different ports and connections
for recirculating lubrication – depending on the
installation position and the operating type – in
order to ensure optimum gearbox cooling without
affecting lubrication.
The diagrams on page 30 show the oil inlet and
outlet points on the gearbox. Please refer to the
relevant installation drawings for precise details.
The oil level must remain in the middle of the oil
sight glass following operation for the first time,
top up to this level if necessary.
The pump, oil tank and heat exchanger
components must be arranged below the
gearbox oil level. Connecting an oil return
as described in chapter 4.6.3.2 assures
limp-home (emergency control)
characteristics.