SENSOR-EQUIPPED BEARING FOR WHEEL

摘要

A sensor-equipped bearing for a wheel, where a load acting on a bearing or a load acting between the wheel and the road surface can be simply and accurately detected. The sensor-equipped bearing for a wheel has an outer member (1) having double-row rolling surfaces (3) formed on its inner circumference, an inner member (2) having rolling surfaces (4), which face the rolling surfaces (3), formed on its outer circumference, and double-row rolling bodies (5) arranged between both the rolling surfaces (3, 4), and the sensor-equipped bearing rotatably supports a wheel relative to a vehicle body. Out of the outer and inner members (1, 2), the member on the stationary side has a strain enlargement mechanism (21) for enlarging strain of the stationary-side member occurring when the rolling bodies (5) run on the member, a strain sensor (22) for detecting strain enlarged by the strain enlargement mechanism (21), and estimation means (24) for estimating, based on an output from the strain sensor element (22), a load acting on the bearing or a load acting between the wheel and the road surface.