Patent ID: 7520183

Claim:
A hub unit with a sensor device, comprising: a hub unit which includes a body-side raceway member to be fixed to a vehicle body, a wheel-side raceway member, having an inner shaft with a flange for mounting a wheel and an inner ring fitted to the inner shaft, to which a wheel is to be mounted, and two rows of rolling elements disposed between the both raceway members; and a sensor device, wherein the sensor device includes at least one magnetostrictive sensor or displacement sensor for detecting an inverse magnetostrictive effect, and processing means for processing an output of the magnetostrictive or displacement sensor, the at least one magnetostrictive or displacement sensor is mounted to the body-side raceway member so as to be capable of measuring either tensile strain in an uppermost part of the inner ring or compression strain in a lowermost part of the body-side raceway member, and the processing means includes a tire grounding load computing unit for obtaining a tire grounding load by respectively extracting an up-and-down directional grounding load, a left-and-right directional grounding load, and a front-and-back directional grounding load, and further includes a rotation detecting unit for obtaining a wheel rotational velocity.