| 摘要 |
A light-weight linear ball bearing includes an outer casing made of a flat, thin steel plate and having a substantially U-shaped cross-sectional form, an inner casing fitted into the outer casing and having a substantially U-shaped cross-sectional form, and a ball casing made of a flat material. The inner casing is made of a flat, thin steel plate and has flange portions and a central flat portion formed by bending the lateral edge portions of the steel plate with the exception of the two longitudinal end portions thereof. The ball casing has: flat mounting portions formed at the two longitudinal ends thereof, side wall portions engaged with the inner surfaces of the lateral flange portions of the inner casing; and a central wall portion which forms non-loaded ball circulating grooves in cooperation with the side wall portions. The ball casing has ball rolling direction changing grooves formed at the longitudinal ends of each of the side wall portions. The upper surfaces of the two side wall portions, the central wall portion and the two mounting portions of the ball casing are in the same plane. When the outer casing, the inner casing, and the ball casing are assembled, the upper surfaces of the two side wall portions, the central wall portion and the two end mounting portions of the ball casing are closely fitted to the central flat portion and two end mounting portions of the inner casing, thereby enabling endless circulating passages to be formed by the non-loaded ball circulating grooves, the ball rolling direction changing grooves and by the flat portions of the inner casing. |
