To provide a ball screw inspection device capable of detecting a damaged condition during the operation of a ball screw.
The ball screw inspection device is provided with a ball screw wherein a plurality of steel balls roll on circulating rolling paths composed of spiral rolling grooves formed in a screw shaft and a nut and facing each other, and return tubes for uniting these rolling grooves, a drive unit for rotating/driving the screw shaft, a moving-by-screwing object which moves in the axial direction of the screw shaft by screwing of the screw shaft into it, a preloading mechanism arranged between the moving-by-screwing object and the nut, a nut rotation stopping mechanism which stops rotation of the nut and is movable in the axial direction, a rotating-shaft conduction mechanism which touches an end face of the screw shaft and becomes in continuity with this screw shaft electrically, and a nut connecting terminal which is in continuity with the nut electrically. The nut and the moving-by-screwing object are put being electrically insulated, a potential difference is applied between the rotating-shaft conduction mechanism and the nut connecting terminal, and by a change in this potential difference the condition of oil film forming between each circulating rolling path and each steel ball is detected.
OKITA SHIGERU
WATANABE YASUMI
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