Measuring and testing – By abrasion – milling – rubbing – or scuffing
Patent
1998-12-23
2000-11-14
Raevis, Robert
Measuring and testing
By abrasion, milling, rubbing, or scuffing
G01N 1902
Patent
active
061453706
ABSTRACT:
A machine for testing material wear and lubrication properties between a bearing pin and opposing bearing blocks includes a wear-test loading apparatus comprising a guide mounted to the frame of the machine, a pair of bearing block holders slidably mounted to the guide, and a low-friction actuator such as a piston-type pneumatic mounted to the bearing block holders for movement there with and independently of the frame. The actuator piston rod is connected to the bearing block holder on one side of the pin adjacent the actuator, and the actuator housing is connected to the bearing block holder on the other side of the pin. When the actuator is pressurized, the piston and housing tend to separate under equal and opposite force due to the pressure in the actuator. This separation causes the bearing block holders to simultaneously slide on the guide and be drawn inwardly toward one another, and thus toward and into bearing contact with the pin, with equal and opposite force. An LVDT or other linear motion sensor may be mounted to detect the relative linear motion between the machine housing and at least on of the sliding bearing blocks. A torque-sensing apparatus may be mounted to detect the torque generated between the bearing blocks and the rotating test pin during the test. In this instance, the guide is rotatably mounted to the spindle housing to permit rotation of the entire bearing block, actuator unit about the axis of the pin during the test, and a force transducer is mounted between one of the bearing blocks and the frame of the machine to detect the torque generated during the test.
REFERENCES:
patent: 2106170 (1938-01-01), Faville
patent: 2110288 (1938-03-01), Cornell
patent: 3190109 (1965-06-01), Faville
ASTM Standard, Standard Test Methods, pp. 309-318, No Date.
ASTM Standard, Standard Test Methods, pp. 61-65, No Date.
Frantz Keith
Raevis Robert
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