Wheel bearing provided with wheel speed sensor having plurality of sensing units

A wheel bearing for supporting a wheel of a vehicle so that the wheel is rotatably mounted on a vehicle body, comprising:

• a rotary element mounted on the wheel and configured to rotate together with the wheel;
• a non-rotary element fixedly mounted on the vehicle body;
• one or more rolling bodies provided between the rotary element and the non-rotary element;
• a sensor target mounted on the rotary element and configured to rotate together with the rotary element;
• and
• a wheel speed sensor disposed adjacent to the sensor target to sense a rotational speed of the rotary element,
• wherein the wheel speed sensor includes a first sensing part and a second sensing part which are configured to sense a change in magnetic field caused by the rotation of the sensor target,
• wherein the second sensing part is disposed to be spaced apart from the first sensing part in a longitudinal direction and a widthwise direction of the wheel speed sensor,
• wherein the sensor target includes a first sensor track positioned in a radially inward direction and a second sensor track positioned in a radially outward direction,
• wherein the first sensor track and the second sensor track are formed to include a same number of pairs of magnetic poles,
• wherein the first sensing part is disposed to face the first sensor track and configured to sense the change in magnetic field generated by the first sensor track,
• wherein the second sensing part is disposed to face the second sensor track and configured to sense the change in the magnetic field generated by the second sensor track, and
• wherein the first sensor track is configured such that a circumferential length of one magnetic pole provided in the first sensor track at a center in a radial direction is 90% or more of a circumferential length of one magnetic pole provided in the second sensor track at a center of the second sensor track in the radial direction.