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The test method IP 186 describes the determination of the
starting and running torque of an axially loaded angular
contact ball bearing [23]. The principle of this method is
shown in the Figure 6, the test allows depending on the
used chiller to examine performance of the greases at the
temperatures down to – 42 °C and – 73 °C [16,19,23].
The Low Temperature Torque Tester LT3 is used to
determine the resistance caused by the grease in an
axially loaded ball bearing at temperatures down to – 73
°C in accordance with IP 186/93 mostly in automotive
and railway applications, civil and military aviation.
The tests are running under standard axial loads 50 N in
the range of torques 0 – 2000 Nmm.
As compared against the conventional devices the
Low Temperature Torque Tester LT3 includes several
improvements as electronically controlled high
precision direct drive, sophisticated torque sensor with
high accuracy, semi-automatic operation with electronic
data acquisition and closed loop cooling jacket.
The test rig presented in the Figure 7 is an up-to-date
tester, accumulating the latest technology developments
against the first variant of LT3, designed in 1960's.
The tester includes an apparatus with the drive and
measuring unit, cooling jacket for hook-up with existing
cooling device, stand-alone controller unit with PLC
and touch panel, PC Software for data acquisition and
analysis. The housing is suited for different bearing
sizes, reuse of existing cooling devices and tailor-made
solutions. Overview of the test parameters is given in
the Table 2.
It involves the following novelties and advantages:
? precision controlled drive with trouble-free,
direct power transmission;
? high precision electronic torque measurements;
? quick and simple assembly/disassembly of the
test rig;
? extensive automation of the entire test
procedures;
? electronic data recording of measured values and
boundary conditions;
? integrated closed cooling;
? minimisation of errors during operation and
testing.
