JP2012092935A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing with a retainer facilitated in the assembling of a column.SOLUTION: The roller bearing includes an inner ring, an outer ring, the retainer, and a plurality of rollers. In the retainer including a pair of rims spaced in an axial direction, mutually coaxially disposed and forming circle, respectively, and a plurality of columns bridging both these rims. A section the four peripheries of which are surrounded by the inner surface of both these rims and the side surface in a circumferential direction of the adjacent column in the circumferential direction serves as a pocket, and a protrusion is formed at the inner circumferential surface side of the center in the axial direction of the columns on both sides which constitute at least one pocket among the plurality of columns.

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. 7 shows a cylindrical roller bearing 1 with a cage incorporated as, for example, a rotor support part of a screw compressor, as an example of such a roller bearing with a cage. 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. 8A is a cross-sectional view of the bearing cage of FIG. 7 as viewed from the A direction. As shown in FIG. 8 (B), the bearing cage 6 is a so-called saddle cage, and is a pair of rings that are arranged concentrically at intervals in the axial direction. Rims 61, 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 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. 9, 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 of the column 64 between the pockets 63 in the axial direction. 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 facilitates assembly of columns.

  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. Each of which is a pocket, and a convex portion is provided on the inner peripheral surface side of the central portion in the axial direction of both columns constituting at least one pocket of the plurality of columns. The roller bearing according to the present invention is characterized in that two convex portions are provided on the outer peripheral surface side of the columns on both sides constituting the pocket. In the roller bearing according to the present invention, it is preferable that an axial length of the convex portion on the inner peripheral surface side is longer than an axial length of the convex portion on the outer peripheral surface side. Moreover, it is preferable that the roller bearing which concerns on this invention provides the convex part by the side of the said inner peripheral surface in the both sides | surfaces of the column side of the at least 2 adjacent pocket.

  According to the present invention, since the convex portion is provided on the inner peripheral surface side of the central portion in the axial direction of the columns on both sides constituting at least one pocket among the plurality of columns, when inserting the roller into the cage, The portion where the roller comes into contact with the convex portion is close to the central portion in the axial direction, and the angle at which the column is inclined in the circumferential direction is small, so that it is easy to assemble the roller in the pocket adjacent to the column.

Sectional drawing of the roller bearing which concerns on 1st Embodiment of this 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 roller bearing of this invention The fragmentary top view which shows the roller pushing-in process of the cage | basket of the roller bearing of this invention Partial plan view showing the roller pressing process of a conventional roller bearing cage Sectional drawing of the roller bearing which concerns on 2nd Embodiment of 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 Partial perspective 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.
<First 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. 61, 61, and a plurality of pillars 67 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. 10 and 11 are a partial perspective view and a perspective view of a conventional roller bearing retainer. In FIG. 10, two convex portions 66A and 66A are provided on the inner peripheral surface side of the column facing the pocket of the column 65, and two convex portions 66B and 66B are provided on the outer peripheral surface side. On the other hand, in FIG. 2 of the present embodiment, one convex portion 68A is provided on the inner peripheral surface side of the central portion in the axial direction of the surface facing the pocket in front of the column 67, and on the outer peripheral surface side. Two convex portions 68B and 68B are provided. Further, as shown in FIG. 3, the convex portion 68A and the convex portion 68B are provided with the same convex portion 68A on the inner peripheral surface side of the surface facing the circumferential direction with a pocket therebetween, Two convex portions 68B and 68B are provided on the outer peripheral surface side. The two convex portions 68 </ b> A and the four convex portions 68 </ b> B are formed in a cylindrical surface shape along the outer peripheral surface of the roller 7, so that the roller does not easily fall from the circumferential opening of the pocket 63. In other words, the width dimension C1 of the opening serving as the roller entrance of the pocket 63 is smaller than the outer diameter dimension D of the roller.

  FIG. 5 is a partial plan view showing a process of pushing the roller into the conventional roller bearing cage from the inner circumferential surface side, and FIG. 4 shows the inner circumferential surface of the roller bearing cage of the present embodiment. It is a fragmentary top view which shows the process pushed in from the side. In FIG. 5, when the roller 7 is pushed in from the inner peripheral surface side of the cage, the roller 7 comes into contact with the portion 66A1 near the rim 61 of the convex portion 66A on the inner peripheral surface side. Because it tilts, a large force is required. On the other hand, in FIG. 4 of this embodiment, when the roller 7 is pushed in from the inner peripheral surface side of the cage, the portion 68A1 near the rim where the roller 7 contacts the convex portion on the inner peripheral surface side is an axially central portion. It is close to. For this reason, the angle at which the column is inclined in the circumferential direction is reduced, and the amount of deformation of the column in the circumferential direction is also reduced. Therefore, the roller 7 can be pushed in with a small force, so that the rollers can be easily assembled in the pocket adjacent to the column. In order to obtain such an effect, in FIG. 2, the end face 68A2 in the axial direction of the convex portion 68A is preferably closer to the central portion in the axial direction than the end face 68B1 near the rim in the axial direction of the convex portion 68B.

<Second Embodiment>
In the second embodiment of FIG. 6, the axial length L1 of the convex portion 69A on the inner peripheral surface side is increased. As a result, the decrease in moment support rigidity of the roller on the inner peripheral surface side of the cage due to the single support portion (convex portion) on the inner peripheral surface side being reduced, and the occurrence of roller skew can be suppressed. As a clear design criterion, it is preferable that the axial length L1 of the convex portion 69A on the inner peripheral surface side is longer than the axial length L2 of the convex portion 69B on the outer peripheral surface side. In addition, since the end surface in the axial direction of the convex portion 69A is closer to the center in the axial direction than the end surface near the axial rim of the convex portion 69B, the roller can be easily assembled as in the first embodiment. Is possible.

As the first and second embodiments, one convex portion is provided on the inner peripheral surface side of the central portion in the axial direction of both columns constituting one pocket, and two convex portions are provided on the outer peripheral surface side. However, in the roller bearing according to the present invention, the convex portion can be provided on the inner peripheral surface side of the pillar constituting at least two adjacent pockets, or all the pockets can be formed. The convex portion can also be provided on the inner peripheral surface side of the column.
Moreover, the above-mentioned embodiment shows an example of this invention, Comprising: This invention is not limited to these embodiment. 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 6 Retainer 6A Retainer 7 Roller 61 Rim 62 Pillar 63 Pocket 64 Pillar 64a Narrow part 65 Pillar 66 Convex part 66A Convex part on the inner peripheral surface side 66A1 A portion near the rim of the convex portion on the inner peripheral surface side 66B A convex portion 67 on the outer peripheral surface side A pillar 68A A convex portion on the inner peripheral surface side 68A1 A portion 68A2 near the rim of the convex portion on the inner peripheral surface side A convex portion on the inner peripheral surface side End surface 68B in the axial direction The convex portion 68B1 on the outer peripheral surface side The end surface 69A near the rim in the axial direction of the outer peripheral surface side convex portion The convex portion 69B on the inner peripheral surface side The convex portion on the outer peripheral surface side

Claims (4)

An inner ring, an outer ring, a cage, and a plurality of rollers, the cage being arranged concentrically with each other in the axial direction, each having an annular shape, and between the rims Each of the rims is surrounded by a plurality of pillars, and the portions surrounded by the four sides by the inner side surfaces of these two rims and the circumferential side surfaces of the columns adjacent in the circumferential direction are respectively pockets, A roller bearing characterized in that a convex portion is provided on the inner peripheral surface side of the central portion in the axial direction of both columns constituting at least one pocket. 2. The roller bearing according to claim 1, wherein two convex portions are provided on the outer peripheral surface side of the columns on both sides constituting the pocket. 3. The roller bearing according to claim 1, wherein an axial length of the convex portion on the inner peripheral surface side is longer than an axial length of the convex portion on the outer peripheral surface side. The roller bearing according to claim 1, wherein convex portions on the inner peripheral surface side are provided on both side surfaces on the column side of at least two adjacent pockets.

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