JP2019173919A - Cage for self-aligning roller bearing - Google Patents

Abstract

To improve mass balance while suppressing the lowering of rigidity accompanied by the formation of an assembling notch at an outside diameter side of a cage, in the cage for a self-aligning roller bearing.SOLUTION: An inside diameter rib 13 is continuously arranged at an inside diameter face of a cage 10 so that a notch 12a coincides with a phase in a peripheral direction. Since an inside diameter side of a point in which the notch 12a is formed is expanded in a width and reinforced by the inside diameter rib 13, the lowering of the rigidity of the cage 10 caused by the notch 12a is suppressed. Also, since a mass which is lost due to the notching the notch 12a from the outside diameter rib 12 is compensated by the continuous arrangement of the inside diameter rib 13, the mass balance of the cage 10 in the peripheral direction can be improved.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cage for a self-aligning roller bearing and a self-aligning roller bearing in which the cage is incorporated.

Since the self-aligning roller bearing has the aligning property, it is suitably used as a bearing in a portion having a shaft deflection or a mounting error.
When such a self-aligning roller bearing is used in applications where a large impact load, repeated load, or rotational load can be applied to a vibrating screen, a mining machine, a crusher, etc., a cage which is one of bearing parts. In addition, the strength is required to withstand this type of load.

For this reason, as described in Patent Document 1, an annular portion and a plurality of pillar portions arranged in parallel in the circumferential direction of the annular portion are provided, and a pocket between which the adjacent pillar portions can hold the rollers becomes a pocket. 2. Description of the Related Art A cage for a self-aligning roller bearing has been developed in which an outer diameter rib (guide rib) that is in contact with the inner diameter surface of an outer ring is provided on the entire circumference of the outer diameter surface of an annular portion.
By providing the outer diameter rib, the width of the cage is expanded in the outer diameter direction, so that the strength is improved.

By the way, since the inner surface of the outer ring of the self-aligning roller bearing is recessed in a spherical shape, the opening diameter thereof is smaller than the inner diameter of the central portion in the axial direction.
On the other hand, the dimensions of the cage of Patent Document 1 are set so that the outer rib is brought into contact with the central portion in the axial direction of the inner diameter surface of the outer ring.
For this reason, the outer diameter of the outer diameter rib is larger than the opening diameter of the outer ring, and the cage cannot be incorporated into the bearing through the opening of the outer ring as it is.

Therefore, the outer diameter rib of the cage is provided with at least a pair of notches formed by notching the opposing positions in the radial direction of the entire circumference.
And the distance between the pair of notches is set smaller than the opening diameter of the outer ring, and when assembling the bearing, the cage can be inserted into the outer ring at the location where the facing notches are provided. Yes.

JP2007-100100A

However, in such a cage, since the radial width is narrowed at the location where the notch is provided and the strength is inevitably lowered, there is a concern that the location where the notch is provided becomes a starting point of breakage. .
In addition, the provision of the notch breaks the mass balance, which was almost uniform over the entire circumference of the cage, which may cause eccentricity of the cage during operation of the bearing, which may adversely affect the rotational performance. There is.

  Accordingly, the problem to be solved by the present invention is to improve the mass balance while suppressing a decrease in strength due to the provision of a notch for incorporation on the outer diameter side of the cage in a self-aligning roller bearing. It is.

  In order to solve the above-described problems, a cage for a self-aligning roller bearing according to the invention includes an annular portion, an outer diameter rib continuously provided on the entire outer circumference of the annular portion, and the outer diameter rib. At least a pair of notches formed by notching the opposite positions in the radial direction in the entire circumference of the outer diameter surface, and a plurality of column portions protruding in the axial direction from both end surfaces of the annular portion and parallel to the circumferential direction of the annular portion And can hold a roller in a pocket formed between column portions adjacent to each other in the circumferential direction of the annular portion, and the notch and the circumference of the entire circumference of the inner diameter surface of the annular portion The structure further includes an inner diameter rib provided continuously at a position where the phase of the direction matches.

If comprised in this way, since the inner diameter side of the location in which the said notch was provided is expanded and reinforced by the said inner diameter rib, the retainer suppresses the fall of the intensity | strength by a notch.
Further, the mass lost by cutting out the notch is compensated by the continuous arrangement of the inner diameter ribs, so that the circumferential mass balance of the cage can be improved.

In the cage according to the invention, it is possible to adopt a configuration in which the mass that is reduced by notching the notch from the outer diameter rib and the mass that is increased by the continuous arrangement of the inner diameter rib are matched.
If comprised in this way, since the mass balance of the circumferential direction of a holder | retainer becomes substantially equal, it can prevent that abnormal rotations, such as eccentricity, arise in a holder | retainer at the time of a driving | operation of a bearing.

In the cage according to the invention, a configuration in which the inner diameter rib is formed in an arc shape along the inner diameter surface of the annular portion can be adopted.
If comprised in this way, since the internal-diameter surface of an internal diameter rib is roundish, when incorporating a holder | retainer in a bearing, it is suppressed that an internal diameter rib and an inner ring | wheel are caught.

  In order to solve the above-described problems, the spherical roller bearing according to the present invention has an outer ring having a raceway surface that is recessed in a spherical shape on an inner diameter surface, and a spherical shape that faces the raceway surface of the outer ring on the outer diameter surface. An inner ring having a recessed raceway surface in a double row in the axial direction, and a plurality of rollers arranged in a double row between the raceways of the inner ring facing the raceway surface of the outer ring, and a rolling surface swelled in a spherical shape. Incorporated between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring, the outer diameter surface of the outer diameter rib is in contact with the inner diameter surface of the outer ring, and the rollers are held in the respective pockets in a rollable manner. And a cage according to the invention.

In the self-aligning roller bearing according to the invention, the inner ring may further have a flange at both axial ends of the outer diameter surface, and the inner diameter rib may have a larger inner diameter than the outer diameter of the flange. .
By making the inner diameter of the inner diameter rib, which is the minimum inner diameter of the cage, larger than the outer diameter of the collar, interference between the cage and the inner ring collar at the time of assembling the bearing is prevented, and the assembly becomes easy.

  Since the present invention is configured as described above, in the self-aligning roller bearing, it is possible to improve the mass balance while suppressing a decrease in strength caused by providing a notch in the annular portion of the cage. It was.

Perspective view of cage for spherical roller bearing Top view of cage for spherical roller bearings Longitudinal section of spherical roller bearing Partially broken perspective view of spherical roller bearing Assembly process diagram for cage outer ring

  Hereinafter, a spherical roller bearing retainer 10 according to an embodiment of the present invention will be described with reference to the drawings, and then a spherical roller bearing 1 according to an embodiment incorporating the cage 10 will be described. To do.

The cage 10 of the embodiment shown in FIGS. 1 and 2 includes an annular portion 11, an outer diameter rib 12, an inner diameter rib 13, and a plurality of pillar portions 14.
The material of the cage 10 is not particularly limited, and examples thereof include resins such as polyamide resin and alloys such as brass. Although the manufacturing method of the holder | retainer 10 is not specifically limited, either injection molding or shaving (scraping) can be illustrated.

As shown in FIG. 1 and FIG. 2, the entire annular portion 11 has an annular shape, and outer diameter ribs 12 are connected to the entire circumference of the outer diameter surface. As will be described later, the outer diameter surface of the outer diameter rib 12 comes into contact with the inner diameter surface of the outer ring 20.
A pair of notches 12a is formed in the outer diameter rib 12 at locations in the entire circumference that are opposed to each other in the radial direction. The notch 12a is formed by notching the outer diameter surface of the outer diameter rib 12 in a straight line, and its bottom is a flat surface. As shown in FIG. 2, the flat surfaces at the bottom of the pair of notches 12a are parallel.

As shown in FIGS. 1 and 2, an inner diameter rib 13 is connected to the inner diameter surface of the annular portion 11. The inner diameter rib 13 is curved in an arc shape along the inner diameter surface of the annular portion 11. The radial width of the inner diameter rib 13 is a uniform width except for both ends in the circumferential direction. As for the inner diameter rib 13, the width in the radial direction gradually decreases toward both ends at both ends in the circumferential direction.
The inner diameter ribs 13 are provided in a pair opposed to each other in the radial direction of the annular portion 11 so that each of the pair of notches 12a and the phase in the circumferential direction of the annular portion 11 are substantially matched. In other words, in the circumferential direction of the cage 10, the center of the inner rib 13 and the center of the notch 12a are in phase with each other, and the formation range L1 of the inner rib 13 and the formation of the notch 12a shown by the chain line in FIG. The range L2 is almost equal.

  By providing the inner diameter rib 13 in this manner, the portion of the retainer 10 where the notch 12a is provided is reinforced from the inner diameter side. Further, the mass balance of the cage 10 that has collapsed due to the provision of the notch 12a is improved by adding the inner diameter rib 13 to the same phase in the circumferential direction. The width dimension of the inner diameter rib 13 and the like so that the mass lost by notching the notch 12a from the entire circumference of the outer diameter rib 12 and the mass given by the addition of the inner diameter rib 13 are substantially equal. By adjusting the above, the mass balance in the circumferential direction of the cage 10 can be improved better.

Each column 14 is a substantially rectangular column that protrudes in the axial direction from the left and right end faces of the annular portion 11, and a plurality of columns 14 are arranged in parallel in the circumferential direction of the annular portion 11.
The radial width of the column portion 14 and the radial width of the annular portion 11 are equal, and the inner diameter surface of the column portion 14 and the inner diameter surface of the annular portion 11 are continuous to form a cylindrical surface. On the outer diameter side of the column portion 14 of the annular portion 11, an outer diameter rib 12 is continuously provided.
A pocket 14a is formed between a pair of column portions 14 adjacent to each other in the circumferential direction of the annular portion 11, and rollers can be held in the pocket 14a.

Here, as shown in FIG. 1, the column part 14 provided on one end face of the annular part 11 and the pillar part 14 provided on the other end face are out of phase in the circumferential direction of the annular part 11. Therefore, the pockets 14 a on one end face side of the annular portion 11 and the pockets 14 a on the other end face side are alternately arranged along the circumferential direction of the annular portion 11. Thereby, the load from the roller accommodated in one pocket row and the load from the roller accommodated in the other pocket row can be distributed in the circumferential direction of the cage 10.
The inner surface of the pocket 14a, that is, the opposing surfaces of the column portions 14 adjacent to each other in the circumferential direction of the annular portion 11 is recessed in a concave cylindrical surface shape corresponding to the shape of the peripheral surface (rolling surface) of the roller.

  The configuration of the cage 10 according to the embodiment is as described above. As shown in FIGS. 3 and 4, the self-aligning roller bearing 1 in which the cage 10 is incorporated includes an outer ring 20, an inner ring 30, and a plurality of rollers 40. Is provided.

As shown in FIGS. 3 and 4, the outer ring 20 has a raceway surface 21 that is recessed in a spherical shape with a constant curvature on the inner diameter surface thereof.
Due to the spherically recessed raceway surface 21, the inner diameter of the outer ring 20 is maximized at the central portion in the axial direction, and the inner diameter (opening diameter) at both end portions in the axial direction is minimized.
An oil hole 22 penetrating in the radial direction is formed in the central portion of the outer ring 20 in the axial direction, and lubricating oil can be supplied into the spherical roller bearing 1 through the oil hole 22.
The outer ring 20 is not provided with a hook.

As shown in FIGS. 3 and 4, the inner ring 30 has a flange 31 and a double-row raceway surface 32 on the outer diameter surface thereof. The flanges 31 are provided at both end portions in the axial direction of the outer diameter surface of the inner ring 30 to prevent the rollers 40 from falling off. In order to prevent interference with the roller 40 at the base portion of the flange 31 and the boundary with the raceway surface 32, a thinning is provided.
As shown in FIG. 3, the double-row raceway surfaces 32 are provided between the both flanges 31, and each is recessed in a spherical shape with a curvature substantially equal to the raceway surface 21 of the outer ring 20.
The boundary portion 33 of the double-row track surface 32 is a flat surface, and the intermediate portion is not provided in the boundary portion 33.
The double-row raceway surface 32 of the inner ring 30 faces the raceway surface 21 of the outer ring 20, and a bearing space is formed between them.

As shown in FIGS. 3 and 4, each roller 40 forms a barrel shape as a whole, and a rolling surface 41 that is a peripheral surface thereof swells in a spherical shape. The curvature of the rolling surface 41 is substantially equal to the curvature of the raceway surface 21 of the outer ring 20 and the raceway surface 32 of the inner ring 30.
The rollers 40 are positioned between the raceway surface 21 of the outer ring 20 and the raceway surface 32 of the inner ring 30 and correspond to the two rows of raceway surfaces 32 of the inner ring 30 in two rows in the axial direction of the self-aligning roller bearing 1. Is arranged. The rollers 40 are arranged in parallel at equal intervals in the circumferential direction of the self-aligning roller bearing 1.

As shown in FIGS. 3 and 4, the cage 10 is incorporated between the outer ring 20 and the inner ring 30.
The annular portion 11, the outer diameter rib 12, and the inner diameter rib 13 of the cage 10 are arranged between two rows of rollers 40 that form two rows, and the outer diameter rib 12 is the central portion in the axial direction of the raceway surface 21 of the outer ring 20. Further, the inner diameter rib 13 faces the boundary portion 33 of the two raceways 32 of the inner ring 30.
Each column portion 14 extends from the annular portion 11 in both axial directions of the self-aligning roller bearing 1 and reaches each row of rollers 40.
The rollers 40 in each row are held in the respective pockets 14a between the adjacent column portions 14 so as to be able to roll.

Here, since the outer diameter of the outer diameter rib 12 is substantially equal to the axial central portion (maximum inner diameter) of the raceway surface 21 of the outer ring 20, the outer diameter surface of the outer diameter rib 12 comes into contact and is guided. ing.
A gap is provided between the inner diameter surface of the inner diameter rib 13 and the outer diameter surface of the inner ring 30, and the inner diameter rib 13 and the inner ring 30 are not in contact with each other.

  The embodiment of the self-aligning roller bearing 1 incorporating the cage 10 for the self-aligning roller bearing is as described above. Next, an assembling process of the cage 10 will be described with reference to FIG.

First, as shown in FIG. 5, the retainer 10 is inserted into the outer ring 20 so that the notch 12 a faces the inner diameter surface of the outer ring 20 while maintaining the state where the axial direction thereof is orthogonal to the axial direction of the outer ring 20.
Since the outer diameter W1 of the cage 10 where the notch 12a is provided is smaller than the opening diameter D1 of the outer ring 20, the cage 10 is inserted through the outer ring 20.

From this state, the cage 10 is rotated around a line connecting the pair of notches 12a so that the axial directions of the cage 10 and the outer ring 20 coincide.
Since the outer diameter W2 of the retainer 10 at a location where the notch 12a is not provided is substantially the same as the inner diameter D2 of the axial central portion, which is the maximum inner diameter of the outer ring 20, the retainer 10 is slightly rotated. , It will be incorporated into the outer ring 20.
Before and after this operation, the self-aligning roller bearing 1 is completed by assembling the inner ring 30 and the rollers 40 as appropriate.

  Here, since the inner diameter (minimum inner diameter) W3 of the cage 10 where the inner diameter rib 13 is provided is larger than the outer diameter of the flange 31, the flange 31 and the inner diameter rib 13 do not interfere with each other. Therefore, the inner diameter rib 13 of the cage 10 does not hinder the assembly of the cage 10 to the bearing.

  The embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes all modifications and variations that fall within the scope of the claims and equivalents thereto.

The shape of the inner diameter rib 13 and the notch 12a of the cage 10 is not limited to that of the embodiment, and the inner diameter rib 13 is shaped so that the inner diameter surface is linear, or the notch 12a is shaped like an arc. You can also.
The number of the inner diameter ribs 13 and the notches 12a is not limited to the embodiment, and for example, two pairs can be provided facing each other in the radial direction.

Further, in the embodiment, the formation range L1 of the inner diameter rib 13 and the formation range L2 of the notch 12a in the circumferential direction of the cage 10 are substantially equal. However, as long as both phases are substantially matched, the formation range L1 And L2 may be different.
For example, when the distance between the outer diameter surface of the inner ring 30 and the inner diameter surface of the annular portion 11 is narrower than that shown in the drawing, the radial width of the inner diameter rib 13 cannot be secured sufficiently, and therefore the formation range L1 is set. It is conceivable to make it wider than the formation range L2 of the notch 12a.

In the embodiment, the inner ring 30 has the flange 31, but the inner ring 30 may have a structure without the flange. Moreover, it is good also as a structure which equips the boundary part 33 of the raceway surface 32 of the inner ring | wheel 30, and the collar 31 is good also as a single collar.
Further, in the embodiment, the outer ring 20 is configured not to have a hook, but may be configured to have a hook.

  In the embodiment, the pockets 14a of the cage 10 are arranged so that the phases are alternately shifted in the circumferential direction of the annular portion 11, but may be arranged so that the phases are matched.

DESCRIPTION OF SYMBOLS 1 Self-aligning roller bearing 10 Cage 11 Annular part 12 Outer diameter rib 12a Notch 13 Inner diameter rib 14 Column part 14a Pocket 20 Outer ring 21 Race surface 22 Oil hole 30 Inner ring 31 鍔 32 Race surface 33 Boundary part 40 Roller 41 Rolling surface
D1 Minimum inner diameter of outer ring D2 Maximum inner diameter W1 of outer ring Minimum outer diameter of cage W2 Maximum outer diameter of cage W3 Minimum inner diameter of cage L1 Inner rib formation range L2 Notch formation range

Claims (5)

An annulus,
An outer diameter rib continuously provided on the entire circumference of the outer diameter surface of the annular portion;
At least a pair of cutouts formed by cutting out radially opposed positions of the entire circumference of the outer diameter surface of the outer diameter rib;
A plurality of pillars protruding in the axial direction from both end faces of the annular part and parallel to the circumferential direction of the annular part,
A cage for a self-aligning roller bearing capable of holding a roller in a pocket formed between column portions adjacent to each other in the circumferential direction of the annular portion,
A retainer for a self-aligning roller bearing, further comprising an inner diameter rib continuously provided at a position where a circumferential phase of the notch coincides with the circumference of the inner diameter surface of the annular portion.   The cage for a self-aligning roller bearing according to claim 1, wherein a mass that is reduced by notching the outer diameter rib and a mass that is increased by the continuous connection of the inner diameter rib are the same.   The cage for a self-aligning roller bearing according to claim 1 or 2, wherein the inner rib is formed in an arc shape along an inner diameter surface of the annular portion. An outer ring having a spherically recessed raceway surface on the inner diameter surface;
An inner ring having a double-row in the axial direction and a raceway surface that is recessed in a spherical shape facing the raceway surface of the outer ring on the outer diameter surface,
A plurality of rollers arranged in a double row between the raceways of the inner ring facing the raceway of the outer ring, and the rolling surfaces swell in a spherical shape;
It is built between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring, and the outer diameter surface of the outer diameter rib contacts the inner diameter surface of the outer ring, and holds the rollers in the respective pockets so that they can roll. A self-aligning roller bearing comprising the cage according to any one of Items 1 to 3. The inner ring further has ridges at both axial ends of the outer diameter surface;
The self-aligning roller bearing according to claim 4, wherein an inner diameter of the inner rib is larger than an outer diameter of the inner ring flange.

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