Abstract: A self-locking structure of a split roller bearing cage includes recesses, locker plates and locking projections. The recesses are defined in outer circumferential surfaces of opposite joint ends of two semicircular split roller bearing cage half-parts along horizontally inscribed tangential lines, that meet an outer circumference of the annular split roller bearing cage and intersect perpendicular with a split center axis of the annular split roller bearing cage. Recesses have widths and depths suitable to receive locker plates. The locker plates are horizontally attached to bottoms of the recesses defined in opposite joint ends of one of the cage half-parts. Locking projections are formed at bottoms of other recesses defined in opposite joint ends of the other cage half-parts to be coupled with respective locker plates. The two cage half-parts are aligned and engaged at their joint ends, forming a full circle. The locker plates can be automatically coupled to the locking projections.

Abstract: A joint type disc cage of a roller bearing in which a joint is provided at a sheared part of the disc cage so as to fit it into a single-pieced outer or inner race of the roller bearing. Owing to the joint structure of the sheared part of the disc cage, the installation of the disc cage can be easily carried out, and the installed disc cage is maintained in a circular form, so that the function of the disc cage becomes superior, and deformations, abrasions and degradations of the disc cage can be prevented, as well as ensuring the durability and safety of the roller bearing. The disc cage 1 is sheared at one place to form a sheared part 2 which forms two joint end portions 2a and 2b, so as to install the disc cage 1 into an annular installing groove 5 of the outer or inner race 4 and 4a of the roller bearing. The joint end portions 2a and 2b of the sheared part 2 are firmly engagedly coupled together, and therefore, actually the disc cage 1 performs like a non-sheared disc cage.

Abstract: A cylindrical roller bearing is disclosed. Roller insertion slots are closed without forming a screw hole, but the closing of the insertion slot is firm, and the aesthetic appearance of the bearing is very perfect. Rollers 4 are inserted into operating channels 2c and 3c of inner and outer races 2 and 3 of the roller bearing 1. Insertion slots 2b and 3b are formed respectively on the collars 2a and 3a of the inner and outer races 2 and 3 to form a roller insertion hole 5 for inserting the rollers 4. The roller insertion holes 5 may be circular, rectangular, twin-arcuate or the like. After filling the rollers 4 into the operating channels 2c and 3c, a closing piece 6 is press-fitted into the insertion hole 5. The closing piece 6 may consist of two pieces 6a and 6b, and has a size larger than that of the insertion hole 5 by about 0.01 mm. Thus the closing pieces are firmly fitted into the insertion slots to such a degree that the closing pieces will never depart under any operating conditions.