Abstract: A yield which is a ratio of the weight of a ring-shaped member to that of a stock material, and a yield which is a ratio of the ring-shaped member to a blank are improved, and the cost is reduced. In a method of producing a ring-shaped member in which a ring-shaped member is obtained from a longitudinally elongated annular blank 3, a pair of linking portions 3b, 3c are outward expanded from the inner side of the blank 3, and a pair of arcuate portions 3d are pressed from the outer side toward the inner side to be pressingly expanded, thereby shaping into a ring-shaped member.

Abstract: A method of producing a ring-shaped member is provided in which a material loss is eliminated, the process cost can be reduced, and a ring-shaped member can be easily obtained from a pipe member by a small number of steps. The method includes steps of: inwardly projectingly shaping a flange portion 1c on an end portion of a metal-made pipe member 1; and cutting off the flange portion 1c from the pipe member 1, thereby obtaining a ring-shaped member 10.

Abstract: A bearing device for a vehicle axle has an outer ring, two connected inner rings and rollers. The outer ring has a mounting flange at the middle in the axial direction on an outside circumference surface thereof and a stepped hole open radially at approximately the middle in the axial direction thereof. A pulser ring is mounted at the middle in the axial direction of the two connected inner rings o outside circumference surfaces of the two connected inner rings. A rotation sensor has a detecting member and a mounting member vertical to the detecting member. The detecting member consists of a small end portion and a large middle portion. The detecting member is inserted in the stepped hole, so that the end portion opposes the pulser ring. A face of the mounting member on a chassis bearing installation member side is positioned near the center line of the middle portion.