ROLLING BEARING UNIT WITH DISPLACEMENT MEASURING DEVICE, AND THE ROLLING BEARING UNIT WITH LOAD MEASURING DEVICE

摘要

PROBLEM TO BE SOLVED: To realize a structure hardly affected by thermal expansion/contraction of a hub 4 or an encoder 12a, accompanying the temperature change in the measurement of moment or axial load.;SOLUTION: Through-holes 14a and 14a inclined in one direction are formed in the encoder 12 provided concentrically with the hub 4. Detection parts of a pair of sensors 17c and 17c, supported to an outer ring 3 via a cover 15 are faced with the outer circumferential surface upper end portion and the lower end portion of the encoder 12a. A computing element which has received the detection signals of both the sensors 17c and 17d determines the inclination between the central axis of the outer wheel 3 and the central axis of the hub 4, based on the phase difference between both the detection signals. Furthermore, the computing element finds the moment and the axial load. Since the phase difference will not change due thermal expansion and contraction of each component, above-mentioned problem can be solved.;COPYRIGHT: (C)2007,JPO&INPIT