| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of determining the preload applied to a bearing without using an electric contact such as a brush and slip ring, reducing the manufacturing cost, and prolonging the device lifetime. Ž<P>SOLUTION: Rolling bearings 3A and 3B in tandem arrangement within a housing 1 for supporting a main shaft 2 receive a preload between the outer rings 3g and the inner rings 3i through spacers 4 and 5, wherein the spacer 5 between the outer ring 3g and the outer ring 3g is pinched by the holder lid 8 of the housing 1 and the housing shoulder 1b and fixed in the axial direction. A first electrode 11 is connected electrically with the outside surface of the housing 1 or the holder lid 8. A second electrode 12 insulated electrically is installed outside the bearing arranged position of the housing shoulder 1b or the holder lid 8, and an electrostatic capacitance generation part 18 is formed between the second electrode and the main shaft 2. The electrostatic capacitance between the two electrodes 11 and 12 is measured by an electrostatic capacitance measuring means 9, and from the measurement, the preload of the rolling bearings 3A and 3B is sensed by a preload sensing means 10. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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