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Fig.1 Bearing test rig. The test shaft is transmitted by the motor rotation amplified by the gearbox (ⅱ). The shaft torque and speed are measured by a torque meter (ⅶ). The motor and test shaft are disconnected by the torque limiter(ⅷ) when a torque value greater than a predetermined value is detected. The test section (ⅲ) consists of a test shaft with a section that resembles the main journal of a crankshaft and a pair of half-split plain bearings. The test section was supplied with lubricant from an oil tank (ⅹ) outside the machine. The connecting rod was loaded onto the test shaft via a sliding bearing by means of a hydraulic vibration exciter (ⅴ). The applied load value was measured by a load cell (ⅵ). A tilting mechanism (ⅳ) keeps the connecting rod horizontal during the test. The UFB generator (ⅸ) is installed in a circuit separate from the lubricant supply circuit to the testing machine.

Fig.2 UFB generator. UFB is generated by a UFB generator composed of porous carbon ceramics by injecting air. The UFB generated part is 200 mm and can be extended to 400 mm and 600 mm by connecting them together.

Fig.3 Friction characteristics test results for lubricants UFB w/o, UFB w/1, UFB w/2, UFB w/3. The black line is UFB w/o (without UFB), the red line is UFB w/1 (with a 200 mm UFB generating area), the blue line is UFB w/2 (with a 400 mm UFB generating area), and the green line is UFB w/3 (with a 600 mm UFB generating area). The vertical axis is torque and the horizontal axis is load.