JP2012072889A - Roller bearing - Google Patents

Abstract

Provided is a roller bearing that can be easily assembled while suppressing a decrease in strength of a column.
A roller bearing (1) has an inner ring (5), an outer ring (3), a cage (6A), and a plurality of rollers (7), and the cage (6A) is a pair of annular rings arranged concentrically at intervals in the axial direction. The rim of the two rims and a plurality of pillars spanned between the two rims, and the portion surrounded by the four sides by the inner side surface of both rims and the circumferential side surface of the column adjacent in the circumferential direction, Each is formed as a pocket, and an axial slit is provided in a portion of the plurality of columns excluding the center in the axial direction on the peripheral surface of at least one column.
[Selection] Figure 1

Description

  The present invention relates to a roller bearing.

  Conventionally, a rolling bearing is incorporated in a rotation support portion of various rotary machine devices. As a rolling bearing for constituting a rotation support portion to which a large load is applied, a roller bearing with a cage using a roller (for example, a cylindrical roller or a tapered roller) as a rolling element is used. FIG. 5 shows, as an example of such a roller bearing with a cage, a cylindrical roller bearing with a cage 1 incorporated in, for example, a rotor support portion of a screw compressor. This cage-equipped cylindrical roller bearing 1 includes an outer ring 3 having a cylindrical outer ring raceway 2 in an axially intermediate portion of an inner peripheral surface, and an inner ring having a cylindrical inner ring raceway 4 in an axially intermediate portion of an outer peripheral surface. 5 and a plurality of cylindrical rollers 7 provided between the outer ring raceway 2 and the inner ring raceway 4 so as to be able to roll while being held by a bearing cage 6.

The upper part of FIG. 6A is a cross-sectional view of the bearing cage of FIG. 5 as viewed from the A direction. As shown in FIG. 6, the bearing cage 6 is a so-called saddle cage, and is a pair of rims 61 that are arranged concentrically with an interval in the axial direction, each having an annular shape. 61, and both rims 61, 61
It consists of a plurality of pillars 62, 62 spanned between them. The portions surrounded by the four sides by the inner side surfaces of the rims 61 and 61 and the circumferential side surfaces of the columns 62 and 62 adjacent in the circumferential direction are defined as pockets 63 and 63, respectively. The side surface of each column 62 between the pockets 63 and 63 is formed in a cylindrical surface shape along the outer diameter surface of the cylindrical roller 7 so that the cylindrical roller 7 does not fall from the opening of the pocket 63. Therefore, the width C of the opening serving as the roller entrance of the pocket 63 is smaller than the outer diameter D of the cylindrical roller 7. At the time of assembling, the cylindrical roller 7 is pushed into the pocket 63 from the inner diameter side of the bearing retainer 6 as shown by a white arrow, and the column 62 is bent by the elasticity of the resin of the bearing retainer 6 so as to be cylindrical. Allows entry of.

  Since the cylindrical roller 7 is pushed into the pocket 63 in this way, if the dimensional difference between the width C of the opening and the roller outer diameter D increases, the cylindrical roller 7 is difficult to enter the bearing cage 6. In particular, in the last roller insertion in the roller insertion process, the two pillars 62 and 62 of the pocket part come into contact with the rollers of the pocket part adjacent to both sides, so that no roller is inserted into the one side pocket part. The conventional insertion process, in which bending deformation is likely to occur, makes it difficult for the rollers to enter as the contact form changes. In addition, when the opening width dimension C is increased, the cylindrical roller 7 is easily inserted. However, the cylindrical roller 7 is easily dropped from the pocket 63 when the bearing is assembled. In particular, when the roller bearing 1 is incorporated into the rotor support portion of the screw compressor, the outer ring 3 and the inner ring 5 may be incorporated separately, and the situation in which the cylindrical roller 7 falls is likely to occur, so the opening width dimension C is increased. That is not preferable.

  As a prior art for improving this part, there is, for example, Patent Document 1. As shown in FIG. 7, the column 64 is easily bent by providing a narrow portion 64 a having a cross section smaller than that of the other portion in the vicinity of the center in the axial direction of the column 64 between the pockets 63. It is what you are doing.

JP-A-8-296652

  However, in the vicinity of the center of the column 64 between the pockets 63 in the axial direction, a melted resin tends to be welded, and a portion where the weld is present is often low in strength. Similarly, if a narrow portion 64 a having a smaller cross section than other portions is provided near the center of the column 64 between the pockets 63 in the axial direction, there is room for improvement in terms of strength of the column 64.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a roller bearing having a cage that can be easily assembled while suppressing a decrease in the strength of a column.

  In order to solve the above problems, the present invention has the following configuration. That is, the roller bearing according to the present invention has an inner ring, an outer ring, a cage, and a plurality of rollers, and the cages are arranged concentrically with each other in the axial direction, and each pair is an annular shape. And a plurality of pillars spanned between the two rims, the four sides of which are surrounded by the inner side surfaces of the two rims and the circumferential side surfaces of the columns adjacent in the circumferential direction. Are pockets, and an axial slit is provided in a portion of the plurality of columns excluding the center in the axial direction of the peripheral surface of at least one column. The roller bearing according to the present invention is characterized in that the circumferential width of the slit is smaller than a value obtained by subtracting the width dimension of the opening of the pocket from the diameter of the roller and dividing by two. Moreover, the roller bearing which concerns on this invention has the said slit in two adjacent pillars. Moreover, as for the roller bearing which concerns on this invention, the surrounding surface which has the said slit is an internal peripheral surface. Moreover, as for the roller bearing which concerns on this invention, the surrounding surface which has the said slit is an outer peripheral surface.

  According to the present invention, since the slit in the axial direction is provided in a portion of the plurality of columns excluding the center in the axial direction on the peripheral surface of the column, the rigidity of the column is lowered and bent. It becomes easy and it becomes easy to assemble a roller in the pocket adjacent to the said pillar.

Sectional view of a roller bearing according to the present invention Partial perspective view of the cage of the roller bearing of the present invention The fragmentary sectional view which shows the roller pushing-in process of the cage | basket of the roller bearing which concerns on this invention The fragmentary top view which shows the roller pushing-in process of the cage | basket of the roller bearing which concerns on this invention Cross section of conventional roller bearing (A) Partial sectional view showing a roller pressing process of a conventional roller bearing cage, (B) is a partial plan view of the cage. Partial plan view of a conventional roller bearing cage Perspective view of a conventional roller bearing cage

Hereinafter, each embodiment of roller bearing 1 concerning the present invention is described with reference to drawings.
<Embodiment>
As shown in FIG. 1, the roller bearing 1 of this embodiment is a cylindrical roller bearing having an outer ring 3, an inner ring 5 and 7 (cylindrical rollers), and a cage 6A. The cage 6A is made of resin, for example. As the resin material, 66 nylon can be used, but 46 nylon excellent in high temperature strength and heat resistance is preferably used. For applications that require wear resistance, oil resistance, and heat resistance, such as screw compressor rotor support parts, use linear polyphenylene sulfide that has excellent wear resistance, oil resistance, and heat resistance. Is more preferable. Further, a cage 6A for a roller bearing with a cage according to the present invention includes, for example, as shown in FIG. 2, a pair of rims arranged concentrically at intervals in the axial direction and each having an annular shape. 67, 67 and a plurality of pillars 65 spanned between these rims. Further, a portion surrounded by four sides by the inner side surfaces of these rims and the circumferential side surfaces of the columns adjacent in the circumferential direction is defined as a pocket 63. In addition, on the side surfaces of the pillars 65 on both pocket sides, there are provided four convex portions 66, 66, 66, 66 in two places each. The convex portion 66 is formed in a cylindrical surface shape along the outer diameter surface of the roller (not shown) so that the roller is difficult to fall from the circumferential opening of the pocket 63. Therefore, as shown in FIG. 3, the width C1 of the opening serving as the roller inlet of the pocket 63 is smaller than the outer diameter D of the roller.

  Further, as shown in FIGS. 3 and 4, since the axial slits 65A and 65A are provided on the columns 65 and 65 except for the axial center 65B on the peripheral surface of the columns, the columns 65 and 65 are provided. The rigidity of the roller 7 is lowered and it becomes easy to bend, and it becomes easy to assemble the roller 7 in the pocket adjacent to the pillars 65 and 65. Further, by providing the slit 65A, stress due to contact deformation at the time of inserting the roller 7 is dispersed throughout the column, so that the axial central portion 65B of the peripheral surface of the column where a weak weld is likely to exist, tensile stress or The stress applied to the base portions 65C and 65C of the column having a large compressive stress can be reduced. Note that the cage of the roller bearing of the present invention differs from the conventional cage of FIG. 8 only in that it has a slit 65A. Further, since the slit 65A is not provided in the axial central portion 65B where the weld is likely to occur, a decrease in the strength of the column can be suppressed. Further, preferably, if the slit 65A is not provided in the rim column connecting portion 61A, a decrease in the strength of the rim can be suppressed.

  Moreover, it is preferable that the circumferential width T of the slit is smaller than a value obtained by subtracting the width C1 of the opening of the pocket from the diameter D of the roller and dividing the result by 2. In such a shape, when the roller 7 is inserted, even if the radial tip of the column 65 provided with the slit is bent in the circumferential direction, the other radial tip supported by the slit is supported. And when inserting the roller 7 in which the other radial tip contacts, even if the column 65 is bent in the circumferential direction, the radial tip of the column 65 is excessively bent locally by the support of the adjacent roller. Can be suppressed. Moreover, the fall of the intensity | strength of a pillar can be suppressed by making the said width | variety T into said range.

  In addition, the roller bearing according to the present invention can easily incorporate the roller by having the slit in at least one column. Preferably, by having the slits in two adjacent pillars, the roller can be more easily incorporated into a pocket between the two adjacent pillars. This is particularly effective in the insertion process of the final roller where it is difficult for the roller to enter. Furthermore, when all the columns have the slits, the rollers can be easily assembled regardless of the order in which the rollers are assembled. The roller bearing according to the present invention preferably has a flange 3A on the outer ring 3 as shown in FIG. 1, for example, and has a slit on the inner peripheral surface when the roller is assembled from the inside. The roller bearing according to the present invention preferably has a slit on the outer peripheral surface when the roller is incorporated from the outside.

As described above, according to the present invention, since at least one of the plurality of pillars is provided with the axial slit in the portion excluding the axial center of the peripheral surface of the pillar, The rigidity is lowered and it becomes easy to bend, and it becomes easy to assemble the roller in the pocket adjacent to the pillar.
The above-described embodiment shows an example of the present invention, and the present invention is not limited to these embodiments. As long as the gist of the present invention is not deviated, the present invention can be applied to other embodiments.

DESCRIPTION OF SYMBOLS 1 Roller bearing 2 Outer ring raceway 3 Outer ring 3A Outer ring collar part 4 Inner ring raceway 5 Inner ring raceway 6 Inner ring 6 Retainer 6A Retainer 7 Roller 61 Rim 61A Rim pillar connection part 62 Pillar 63 Pocket 64 Pillar 64a Narrow part 65 Pillar 65A Slit 65B Axial direction Center 65C Column base 66 Convex

Claims (5)

A roller bearing includes an inner ring, an outer ring, a cage, and a plurality of rollers, and the cage is disposed concentrically with a gap in the axial direction, each having a ring shape, It consists of multiple pillars spanned between the rims, and the part surrounded by the four sides by the inner side surface of both rims and the circumferential side surface of the column adjacent in the circumferential direction is a pocket, A roller bearing characterized in that an axial slit is provided in a portion of the plurality of columns excluding the center in the axial direction of the peripheral surface of at least one column. 2. The roller bearing according to claim 1, wherein the circumferential width of the slit is smaller than a value obtained by subtracting the width of the opening of the pocket from the diameter of the roller and dividing the result by 2. The roller bearing according to claim 1, wherein the slit is formed in two adjacent columns. The roller bearing according to claim 1, wherein the circumferential surface having the slit is an inner circumferential surface. The roller bearing according to claim 1, wherein the peripheral surface having the slit is an outer peripheral surface.

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