JP2000087972A - Press-type cage for roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent concentration of stress on continuous portions by smoothly connecting, by means of quarter-circular-arc-shaped curved face, both edges of each column in a circumferential direction with inner edges of each of first and second rib portions over an overall width of each edges in a thickness direction. SOLUTION: In a cage 7a, inner edges of ring-like first and second ribs parallel to each other are bonded by a plurality of column portions 10 provided at regular intervals in a circumferential direction, and portions, which have four circumferences surrounded by the inner edges of the rib portions 8, 9 and the circumferential edges of the column portions 10, are defined as pockets 11. In both circumferential edges of each column 10, flat faces 16 are formed at outer diameter portions and inclined faces 12 are formed at intermediate portions to inner diameter portions concerning a diametrical direction of the cage 7a. Curved faces 14 which is quarter-cylindrical-concave-face-shaped connect both end portions of the flat faces 16 with the inner edges of the rib portions 8, 9, and curved faces 15 which is quarter- tapered-concave-face-shaped connect both ends of each inclined face 12 with inner edges of the rib portions 8, 9, so that edges are smoothly continuous with each other. Accordingly, stress is not susceptible to concentrate on continuous portions to prevent damage such as cracks from occurring, resulting in ensuring sufficient durability and reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a press-type cage for a roller bearing, which is incorporated in a roller bearing for supporting a rotating body that rotates under a large radial load, such as a main shaft of a machine tool. In particular, the press-type cage for a roller bearing of the present invention aims to improve reliability and durability by preventing stress from being concentrated on a continuous portion between each rim portion and each column portion. In addition, in addition to a general cylindrical roller bearing, the press-type cage for a roller bearing that is an object of the present invention includes:
Also includes other roller bearings such as tapered roller bearings and spherical roller bearings.

[0002]

2. Description of the Related Art A roller bearing 1 as shown in FIG. 3 is widely used for a rotary support portion to which a large radial load is applied. The roller bearing 1 includes an outer ring 3 having a cylindrical outer raceway 2 formed at an intermediate portion of an inner peripheral surface, an inner ring 5 having a cylindrical convex inner raceway 4 formed at an intermediate portion of the outer peripheral surface, and the outer ring raceway 2. A plurality of rollers 6 rotatably provided between the inner raceway 4 and the inner raceway 4
And a retainer 7 for holding the plurality of rollers 6.

[0003] The retainer 7 is called a press-type retainer, and is formed by pressing a metal plate such as a punching process and a bending process as shown in FIGS. That is, the retainer 7 has the annular first rim 8 at one end in the axial direction (the left end in FIG. 3) and the other end in the axial direction (FIG. 3).
(Right end) of the ring-shaped second rim 9. The first and second rim portions 8 and 9 are connected to each other by a plurality of pillar portions 10. These pillars 10 are arranged at equal intervals in the circumferential direction, with one end on the inner edge of the first rim 8 and the other end on the second rim. Each of the rims 9 is continuous with the inner edge. Then, the circumferential side edges of each of the pillar portions 10 and the first and second rim portions 8,
The portions surrounded on four sides by the inner edge of 9 are pockets 11, 11 for holding the rollers 6, 6 in a rollable manner inside the respective portions.

In the illustrated example, the diameter (inner diameter) of the retainer 7 is shown.
Is larger than the pitch circle diameter of the plurality of rollers 6, 6, and the pockets 11, 11 are each sized so that only a part of each of the rollers 6, 6 can be inserted (each roller 6, 6). , 6) (smaller than the maximum area). Further, at a part of both circumferential edges of each of the pillars 10, at an intermediate part or an inner diameter part with respect to the diametrical direction of the retainer 7,
The inclined surfaces 12, 12 are formed by surface pressing with a press. Each of the inclined surfaces 12, 12 is inclined in a direction in which the width of each of the pockets 11, 11 increases toward the inner diameter side. Such a cage 7 includes a portion of the rolling surfaces of the rollers 6, 6 held in the pockets 11, 11 on the outer diameter side of the pitch circle diameter in the diameter direction of the cage 7, The cage 7 is incorporated into the roller bearing 1 as a rolling element guide for positioning the retainer 7 in the diameter direction based on engagement with the inclined surfaces 12 and 12.

When the outer race 3 and the inner race 5 rotate relative to each other with the retainer 7 as described above incorporated in the roller bearing 1 as described above, the rollers 6, 6 roll (rotate). Revolves to allow this relative rotation. At this time, while the rolling surfaces of the rollers 6 and 6 and the inclined surfaces 12 and 12 formed on both circumferential edges of the pillars 10 and 10 are in sliding contact with each other, the retainer 7 is moved by the rollers 6 and 6. , 6 at the same revolution speed.

[0006]

In the case of the conventional retainer 7 described above, both ends of each pillar 10 and the first and second ends are accompanied by face pressing for forming the inclined surfaces 12 and 12. As shown in FIG. 4, corner recesses 13, 13 which were bent at a large curvature existed in a continuous portion with the inner edges of the rim portions 8, 9.
On the other hand, during the operation of the roller bearing 1, the revolving speed of each of the rollers 6, 6 and the rotation speed of the cage 7 do not always completely coincide with each other, but change slightly (relative rotation by a small angle). . With this change, the rolling surfaces of the rollers 6, 6 may collide with the inclined surfaces 12, 12, or the rolling surfaces may be pressed against the inclined surfaces 12, 12. Then, a force in the circumferential direction is applied to each of the pillar portions 10 with such a collision or pressing.

[0007] Based on the circumferential force applied to each of the pillars 10 in this manner, the end of each of the pillars 10 and the inner edges of the first and second rims 8 and 9 are connected. In the continuous part,
A moment in the direction of bending the continuous portion is applied. When the corner recesses 13, 13 whose corners are sharply bent as described above are present in the continuous portion, these corner recesses 13, 1 are provided.
3, stress concentration occurs in these corner recesses 13
It is not preferable because damages such as cracks easily occur and the durability of the cage 7 is impaired. The press-type cage for a roller bearing according to the present invention is designed to prevent the end of each of the pillars 10 and the inner rims of the first and second rims 8 and 9 in order to prevent a decrease in durability due to such causes. And a structure in which stress is not concentrated on a continuous portion with the above.

[0008]

The press-type retainer for a roller bearing according to the present invention is formed by pressing a metal plate in the same manner as the above-described conventional roller-bearing press retainer, and is formed at one end in the axial direction. An annular first rim portion, an annular second rim portion arranged at the other end in the axial direction, and an annular first rim portion arranged at equal intervals in the circumferential direction, and one end portion of each of the annular rim portions; A plurality of pillar portions each connected to the inner edge of the first rim portion, the other end portion to the inner edge of the second rim portion, and both circumferential edges of each of the pillar portions. And a plurality of pockets which are provided at portions surrounded on all sides by the inner edges of the first and second rim portions and which hold the rollers rotatably inside the respective portions. In particular, in the roller bearing press-type retainer of the present invention, the circumferential side edges of each of the pillars and the inner edges of the first and second rims are connected to each of the pillars and the first rim. , Over the entire width of each of the side edges in the thickness direction of the second rim portion, is smoothly connected by a quarter-arc curved surface.

[0009]

In the case of the press-type cage for a roller bearing according to the present invention having the above-described structure, stress is concentrated on a continuous portion between the end of each pillar and the inner edges of the first and second rims. Since such a continuous portion is hardly damaged by cracks or the like, sufficient durability and reliability can be ensured.

[0010]

1 and 2 show an embodiment of the present invention. The entire structure of the cage 7a, which is a press-type cage for a roller bearing of the present invention, is the same as that of the conventional cage 7 shown in FIGS. First and second rim portions 8 and 9 each arranged in a ring shape and arranged in parallel with each other
Are connected to each other by a plurality of pillars 10, 10 arranged at regular intervals in the circumferential direction.
The portions surrounded by the inner edges of the first and second rim portions 8 and 9 and the circumferential side edges of the pillar portions 10 and 10 that are circumferentially adjacent to each other are pockets 11 and 11, respectively.
And

In particular, in the retainer 7a, which is a press-type retainer for a roller bearing according to the present invention, each of the column portions 10,
10 and the first and second rim portions 8 and 9
And the inner width of each of the pillars 10, 10 and the thickness of each of the first and second rims 8, 9 (the front-to-back direction in FIG. 1 and the vertical direction in FIG. 2). , And are smoothly continued by the quarter-arc curved surfaces 14 and 15.

That is, of the circumferential side edges of the column portions 10, 10, a flat surface 16 is formed on the outer diameter side with respect to the diametrical direction of the retainer 7a, and the flat surface 16 is formed on the intermediate portion or the inner diameter side portion. The inclined surfaces 12 and 12 are formed respectively, and both ends of the flat surface 16 and the inner edges of the first and second rim portions 8 and 9 are formed into a quarter cylindrical concave shape. Due to the curved surface 14, it is smoothly continued. On the other hand, both ends of each of the inclined surfaces 12 and 12 and the inner edges of the first and second rim portions 8 and 9 are connected to each other by a quarter-concave curved surface 1.
5 and 15 also make the connection smooth.

In the case of the press-type cage for a roller bearing of the present invention configured as described above, the ends of the pillars 10 and 10 and the inner edges of the first and second rims 8 and 9 are provided. There is no bent portion with a large curvature, such as the above-described corner concave portions 13 and 13 (FIG. 4) in the conventional structure. In other words, the curvature of each of the curved surfaces 14 and 15 is smaller than the curvature of each of the corner recesses 13 and 13 (the radius of curvature is large), so that stress is less likely to be concentrated. Therefore, damage such as a crack is less likely to occur in each of the continuous portions, and sufficient durability and reliability can be ensured.

The illustrated example is applied to a case where the present invention is applied to a press type retainer for a cylindrical roller bearing called an NU type and having inward flange-shaped flanges at both ends of an inner peripheral surface of an outer ring 3. It was shown. However, the present invention is not limited to such a structure, and other types of cylindrical roller bearings such as NJ type, NUP type, N type, and NF type, tapered roller bearings, self-aligning roller bearings, etc.
As long as it is a roller bearing, it can be applied to a press type cage for other types of roller bearings. Also, the inclined surfaces 12, 12 formed on the respective column portions 10, 10 are not flat surfaces as shown in the figure,
If each of the rollers 6, 6 is formed into a partial cylindrical concave shape having a radius of curvature slightly larger than the radius of curvature of the rolling surface, a contact portion between each rolling surface and each of the inclined surfaces 12, 12 is A sufficient oil film can be formed. In addition, it is possible to reduce the resistance to the rolling of the rollers 6 and 6 and to improve the wear resistance.

[0015]

The press type cage for a roller bearing according to the present invention is
Since it is configured and acts as described above, to prevent damage such as cracks from occurring in the continuous portion between the first and second rim portions and the pillar portions, a roller bearing incorporating a press type retainer, In addition, the reliability and durability of various mechanical devices incorporating the roller bearing can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing an example of an embodiment of the present invention when a part of a retainer is viewed from an inner diameter side.

FIG. 2 is an enlarged perspective view of a portion A in FIG.

FIG. 3 is a partial cross-sectional view of a roller bearing incorporating a cage to which the present invention is applied.

FIG. 4 is a view similar to FIG. 2, showing an example of a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller bearing 2 Outer raceway 3 Outer raceway 4 Inner raceway 5 Inner raceway 6 Roller 7, 7a Retainer 8 First rim part 9 Second rim part 10 Column part 11 Pocket 12 Inclined surface 13 Corner recess 14 Curved surface 15 Curved surface 16 Flat surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Katsuhiko Ushi 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 3J101 AA13 AA24 AA32 AA42 AA52 AA62 BA34 BA44 DA09 EA01 FA31 GA31

Claims (1)

[Claims] An annular first rim disposed at one end in the axial direction and a second annular rim disposed at the other end in the axial direction. Are arranged at regular intervals from each other in the circumferential direction, and one end of each is located on the inner edge of the first rim, and the other end is located on the inner edge of the second rim. A plurality of continuous pillars, circumferentially opposite side edges of each pillar and the inner edges of the first and second rims are provided in portions surrounded on all sides, and rollers are provided inside each of the pillars. In a press-type cage for roller bearings provided with a plurality of pockets for rollingly holding the first and second rims, inner circumferential edges of the first and second rims are formed. In the thickness direction of each of the pillars and the first and second rims, a quarter-arc curved surface is formed over the entire width of each of the side edges. Press-type cage for roller bearings characterized by smoother connection.