Damping characteristics in vibration transfer through deep-groove ball bearings were measured precisely using a single ball bearing (equivalent to the 6200 type) and the compliance transfer function resulting from the impulses applied to the bearing. To eliminate uncertainties caused by bearing assembly and preloading, a monolithic-type ball bearing was specially fabricated by unifying its inner ring with a shaft, and its outer ring with a rotor. This structure enables preloading without the need for any solid contact using an externally pressurized air bearing. Experimental damping ratios were found to range from two to four percent and damping coefficients 0.15-0.35 Ns/mm. Damping was found to decrease with an increasing preload, and to be larger for a larger clearance and for a larger ball number. The decreases in damping resulting from superimposing the tilting mode vibration upon the lateral mode and from an increasing clearance indicated more ball rolling motion rather than slipping motion to be the cause of decreased damping. Also, the bearing rotation effect is found to be small. Addition of grease hardly provided any additional damping during rotation.

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