BackgroundThe friction and wear performance of wet clutches and other devices of this type can
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The friction and wear performance of wet clutches and other devices of this type can be improved by attention both to the lubricant and the friction material used. In 1995 a Japanese Standard was introduced, describing a method of determining the friction characteristics of various production clutch plate components.
Other test methods include the LVFA and the SAE#2 machines. The former uses small scale parts, manufactured from the friction material, and uses a flywheel coast-down to achieve a full range of sliding speeds. The SAE#2 machine tests a full clutch pack and, while giving an overall performance of the clutch/lubricant system, does not give detailed knowledge of friction characteristics or the influences of wear of the components.
The STD-TE 92M Automated Clutch Friction Test Machine offers just that possibility. It uses a single friction pair in their original manufactured state. The machine may be configured to accept clutch plates from North American, European and Japanese manufacturers by fitting appropriate clamps STD-TE 92M/FPC. Clutch plates up to 11.25 inch (286 mm) diameter may be accommodated.
The machine may also be used to test limited-slip differential, synchromesh and torque converter components with custom design modifications. The machine can be supplied with test adapters to conform to the JASO M349 standard.
| Specimen Size: | Mean radius of friction material: 35 to 125 mm (typical) |
| Maximum outer diameter: 286 mm | |
| Small Size Specimen: | Mean radius of friction material: 15 mm (typical LVFA) |
| Speed Turn-Down Ratio: | 100:1 |
| Machine Torque/Speed: | 37.5 Nm @ 1.000 rpm |
| 18.7 Nm @ 2.000 rpm | |
| 224 Nm @ 167 rpm | |
| 112 Nm @ 333 rpm | |
| 50% over-current capacity for 30 seconds | |
| Low Load: | 50 to 1.000 N (LVFA specimens) |
| High Load: | 250 to 10.000 N (CLUTCH specimens) |
| Torque Transducer: | strain gauge beam |
| Range: | 1.000 N |
| Torque Arm Radius: | 187 mm |
| Torque Range: | 180 Nm |
| Heater Power: | 3 kW |
| Method: | electrical resistance heaters |
| Temperature Range: | 40 to 200°C (100 to 400°F) |
| Temperature Sensor: | K-type thermocouple |
| Motor: | 4 kW, 4-pole ac with 1024 pulse per rev shaft encoder |
| Interface: | Serial Link Interface Module |
| Software: | COMPEND 2000 |
| TE 92M/CSM Coolant Service Module | |
| Circulating Fluid: | heat transfer oil |
| Feed Pump: | positive displacement gear pump |
| Pump Power: | 0.37 kW |
| Flow Rate: | 4 litres/minute maximum |
| Control Valve: | 3-way electro-pneumatic |
| Controlled Parameters | Rotational Speed |
| Temperatures | |
| Load | |
| Test Duration | |
| Recorded Parameters | Load |
| Rotational Speed | |
| Friction Torque | |
| Temperatures | |
| Test Duration | |
| Friction Coefficient | |
| Services | |
| Electricity: | 380/415 V, three phase, 50/60 Hz, with neutral and earth 7.5 kW |
| Clean, dry air: | 4 cfm at 8 bar (120 psi) |
| Mains water and drain: | 10 l/min (typical) |
| Installation | |
| Floor-standing machine: | 600 mm x 800 mm deep x 1.000 mm high, 400 kg |
| Coolant service module: | 930 mm x 530 mm x 500 mm high, 50 kg |
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