| 摘要 |
A rotational viscometer or tapered bearing simulator for testing motor oils and other fluids has a stator, a matching rotor fitting into it, and a drive shaft extending axially from the rotor. The shaft is direct-driven by a multispeed synchronous AC motor mounted on a low-friction turntable free to rotate over a limited arc. Torque experienced by the turntable is measured by a strain gage. The turntable rests on a platform which is vertically adjustable by and cantilevered from a fine screw-equipped elevator bracket. For temperature control, the stator is embedded in thermally insulating material and surrounded by an electric heating coil and a passageway through which air may flow. The stator and rotor have closely matched parallel surfaces produced by fine grinding. The rotor may have flats modified with a small fillet to entrap any minute particles in the test fluid. A pre-load assembly including weights applies measured torque to the turntable to calibarate and help stabilize the instrument.
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