| 摘要 |
The revolving speed of balls (8, 8) constituting the outer row is detected by a revolving speed-detecting sensor (24). Further, the rotating speed of a hub (1a) is detected by a rotating speed-detecting sensor (25). A speed ratio that is the ratio between the revolving speed and the rotating speed is obtained based on the detected signals from both sensors (24, 25). When an axial load varies and the contact angle of the balls (8, 8) varies, the revolving speed of the individual balls (8, 8) varies, and in turn the speed ratio varies. Then, the axial load is calculated based on the variation of the speed ratio. In this way, a load-measuring device for a rolling bearing unit can be structured at low costs, and a structure with which an axial load acting between the hub (1a) and an outer ring (4a) can be obtained is realized. |
