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The test rig incorporates 6 test stations, with test rings of 100mm diameter locked onto a single shaft. The shaft may be continuously rotated or oscillated.
The sliding speed range is covered by a direct coupled dc motor and 20.9:1 or 195:1 reduction gearboxes. Oscillating tests are achieved by using an adjustable throw crank mechanism coupled between the 20.9:1 reduction gearbox and the specimen shaft.
Test specimens may be conformal or non-conformal blocks of material or sections of plain bearings. The six ring samples are a sliding clearance fit on the test shaft and are locked in place by an axial force generated by a hydraulic nut.
The test specimens are mounted inside sealed reservoirs to allow for fluid recirculation. The seals will allow up to 5mm of movement that is due to wear in the contact.
The loading system uses hydraulic cylinders to achieve the full-scale values. The applied load is measured by strain gauge force transducers mounted directly beneath the specimen carrier assembly. Low loads are achieved using dead weights through a 5:1 lever, which acts independently from the hydraulic system.
The hydraulic cylinders are fitted with spring returns for rapid removal of applied load. Each load station is provided with an automatic unloading system triggered by either a physical micro-switch (wear limit) or from the controller at a preset limit of temperature or friction (if instrumentation is fitted).
All test stations are adaptable to allow the following measurements:
friction force
wear
block sample temperature
fluid temperature, circulation and cooling
The TE 101has PC based sequence programmable control and data acquisition. This is provided by an integrated Serial Link Interface Module and COMPEND 2000 software running on a host PC, operating under Windows. Data is stored to hard disc in standard spead sheet compatible file formats (.csv or .tsv).
Tests are defined by a sequence of steps, each step containing set-point, data recording rates and alarm level information. Set-points may be adjusted by step change or ramp. The test sequence is followed unless interrupted by the operator or an alarm. Set-points may also be adjusted manually using on screen toggles.
The basic performance envelope is defined by the following practical material or application limits. For all six stations the limits are as follows:
Maximum Bearing Pressure (for all six stations) 120 MN/m2
Limiting PV Value 106 N/m2 . m/s
Maximum Sliding Speed continuous rotation 10 m/s
Maximum Sliding Speed oscillation 0.55 m/s
Minimum Sliding Speed for low loads 5 mm/s or less
Maximum Dry Friction Coefficient 0.4
In addition the test rig has the capacity to operate 2 test stations at higher values of pressure and sliding speed, with the same limiting PV value:
Maximum Pressure (two end stations) 200 MN/m2
Maximum Sliding Speed 20 m/s
For oscillating tests the amplitude of motion is up to +/- 30°, and the maximum oscillating frequency at this amplitude is 3.3 Hz (200 rpm).
The recommended minimum effective size for a test specimen is 25mm x 25mm.
The overall limits of the machine are defined by the maximum load on the shaft, the power of the motor and the maximum torque available at each speed.
Maximum Power 12 kW
Torque at 3,000 rpm 40 Nm
Gearbox Ratios 20.9:1 and 195:1
Maximum Total Load on Shaft 100,000 N
Rotational Speed
Loads
Test Duration
Rotational Speed
Friction Torques
Loads
Temperatures
Test Duration
Friction Coefficients
| Electricity: | 380/415 V, three phase, 50/60 Hz, with neutral and earth, 15 kW |
| PC and Printer: | Minimum Specification |
Copyright © 2002 Phoenix Tribology Ltd.