| 摘要 |
The present invention relates to a linear bearing, particularly a linear bearing that can be used in applications requiring high rigidity, such as guide posts of presses and molds. The present invention proposes a linear bearing (1), which comprises of a guide shaft (2), and outer cylinder (3) capable of moving in the axial direction relatively to the guide shaft outside the guide shaft, a plurality of rolling elements (4) interposed between the guide shaft and the outer cylinder, and a cage (5) provided between the guide shaft and the outer cylinder for retaining said rolling elements disposed in the circumferential direction and in the axial direction of the shaft. Each of the rolling elements is a roller having a convex circular arc surface of revolution (8) formed on the cylindrical surface thereof. The inner surface (9) of the outer cylinder is formed as a cylindrical surface, and the outer surface (10) of the guide shaft is provided with axially extending guide grooves (12), each having a concave cylindrical surface, corresponding to the respective rows of rollers disposed in the axial direction. The radius (R) of curvature of the circular arc surface of revolution (8) of each of the rollers is less than the radius (Ro) of the inner surface of the outer cylinder and the radius of curvature (Ry) of the concave cylindrical surface of each of the grooves formed in the guide shaft. The pitch (P) of the rollers disposed in the circumferential direction is less than twice the width (B) of each roller. In this linear bearing, it is preferred that the width of each of the rollers is kept smaller than the outer diameter (OD) of the roller. The invention provides a linear bearing that has a higher rigidity can be produced easily, is lower in production cost, and can be easily assembled with a mating apparatus, compared with known types of linear bearings. <IMAGE>
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