Bearing box

The utility model relates to a bearing box especially used by an articulated arm of a three-dimensional coordinate measuring device. The bearing box (1) is basically formed by a hollow cylindrical box shell (2) and a shaft (3) arranged in the box shell (2), wherein the shaft is supported in the box shell (2) in a rotatable manner via two rolling supports distant from each other axially. According to the bearing box, the two rolling supports are formed by a single rolling bearing (4) which is provided with two columns of rolling bodies (5, 6) which are distant from each other axially, are arranged in an O shape and are opposite to each other; at least one of the two columns of rolling bodies (5, 6) is formed by ball rollers (7 or 8) provided with two symmetrical sides (9, 10 or 11, 12) which are obtained by smoothing spherical foundation shapes and are parallel to each other; and the inner ring of the rolling bearings (4) is formed by the shaft (3) of the bearing box (1) and ditch-shaped inner roller paths (14