BEARING DEVICE WITH LOAD SENSOR, MAIN SPINDLE DEVICE OF MACHINE TOOL AND MACHINE TOOL

摘要

PROBLEM TO BE SOLVED: To provide a bearing device with a load sensor that can accurately measure an axial load acting on a rotating shaft by using a compact sensor, a main spindle device of a machine tool and the machine tool.

SOLUTION: The bearing device 10 with the load sensor includes an angular ball bearing 20 and a sensor unit 30 composed of an encoder 31 and the sensor 32 which is arranged so as to oppose a surface to be detected of the encoder 31. The encoder 31 of the sensor unit 30 is arranged at an inner ring 12, and the sensor 32 is arranged at an outer ring 11. In the surface to be detected of the encoder 31, a porion at which pitches of characteristics which are varied with respect to the circumferential direction are continuously varied with respect to the axial direction is formed of a single row in the axial direction.

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