Cages for radial roller bearings and radial roller bearings

Abstract

This invention provides a cage for radial roller bearings and a radial roller bearing structure that prevents the amount of roller fall in only some of the pockets from becoming smaller or larger. [Solution] Each of the multiple pockets 10 has multiple holding pockets 10a that hold rollers 3 so as to roll around inside each, and at least one dummy pocket 10b inside that does not hold rollers 3. The welded joint 11 is provided in the portion of the two rim portions 8 that surrounds one of the at least one dummy pockets 10b.

Description

Technical Field

[0001] The present disclosure relates to a cage for a radial roller bearing and a radial roller bearing.

Background Art

[0002] Among the rotating shaft portions of various mechanical devices, a radial roller bearing is incorporated in a portion where a large radial load is applied. A radial roller bearing is configured by arranging a plurality of rollers between an outer ring race provided on the inner peripheral surface of an outer diameter side member and an inner ring race provided on the outer peripheral surface of an inner diameter side member so as to be rotatable while being held by a cage.

[0003] The cage includes two annular rim portions coaxially arranged with a space therebetween in the axial direction, a plurality of column portions spanned between the two rim portions and arranged with a space therebetween in the circumferential direction, and a plurality of pockets surrounded by the two rim portions and two column portions adjacent to each other in the circumferential direction among the plurality of column portions. The plurality of rollers are held inside the plurality of pockets.

[0004] Such a cage for a radial roller bearing is manufactured, for example, as described in Japanese Utility Model Laid-Open No. 6-69439, by punching a metal plate as a material to form an intermediate material having a substantially ladder shape, then rounding the intermediate material, and welding both ends on both sides in the stretching direction to form a welded joint.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a cage for radial roller bearings, one pocket with welded joints on both axial sides is prone to larger errors in circumferential width due to the influence of these welded joints.

[0007] If the circumferential width dimension of one of the pockets is small, the so-called drop amount, which is the amount by which a portion of the rollers can protrude radially inward from the inner surface of the retainer, becomes small. As a result, some rollers positioned inside the pocket may not be able to withstand the radial load, and in severe cases, a radial load may be applied to the retainer.

[0008] On the other hand, if the circumferential width dimension of one of the pockets is large, it may become impossible to hold the roller with that pocket, or the amount of rollers that fall inside the pocket may increase, potentially reducing the workability of inserting the inner diameter member into the inner diameter side of the radial roller bearing.

[0009] This disclosure aims to provide a cage for radial roller bearings and a structure for radial roller bearings that can prevent the amount of roller fall in only some of the pockets from becoming smaller or larger. [Means for solving the problem]

[0010] A cage for a radial roller bearing according to a first aspect of the present disclosure comprises two rim portions, a plurality of column portions, and a plurality of pockets.

[0011] The two rim portions are configured in an annular shape. The two rim portions have a welded joint at at least one location in the circumferential direction and are arranged coaxially with a gap between them in the axial direction.

[0012] The multiple columnar sections are stretched between the two rim sections and are arranged with gaps between them in the circumferential direction.

[0013] Each of the aforementioned multiple pockets is surrounded on all four sides by the two rim portions and two adjacent column portions from among the multiple column portions in the circumferential direction, and the circumferential center positions of each are arranged at equal intervals in the circumferential direction.

[0014] In particular, in the cage for a radial roller bearing according to the first aspect of the present disclosure, the plurality of pockets each have a plurality of holding pockets that hold rollers rotatably inside each, and at least one dummy pocket inside that does not hold the rollers.

[0015] Furthermore, the welded joint is provided in the portion of the two rim portions that surrounds one of the at least one dummy pockets.

[0016] In a radial roller bearing cage of a second aspect of the present disclosure, the at least one dummy pocket in the radial roller bearing cage of a first aspect of the present disclosure may be composed of a plurality of dummy pockets.

[0017] In a radial roller bearing cage of a third aspect of the present disclosure, the plurality of dummy pockets can be arranged such that, in the radial roller bearing cage of a second aspect of the present disclosure, the angle between lines perpendicular to the central axes of the two rim portions and passing through the circumferential centers of two adjacent dummy pockets in the circumferential direction is θ[deg], the number of the plurality of pockets is N, and the number of the plurality of dummy pockets is Nd, the plurality of dummy pockets can be arranged such that the relationship 360 / Nd-360 / N≦θ≦360 / Nd+360 / N is satisfied.

[0018] In the radial roller bearing cage of the fourth aspect of the present disclosure, the plurality of dummy pockets can be arranged at equal intervals in the circumferential direction, as in the radial roller bearing cage of the third aspect of the present disclosure.

[0019] In a radial roller bearing cage of a fifth aspect of the present disclosure, in a radial roller bearing cage of any of the first to fourth aspects of the present disclosure, the at least one dummy pocket may be of a shape and / or size that is incapable of holding the roller. The inability of the at least one dummy pocket to hold the roller means that the at least one dummy pocket is incapable of arranging the roller inside it, or that the roller arranged inside the at least one dummy pocket falls out radially.

[0020] In a radial roller bearing cage of a sixth aspect of the present disclosure, the minimum axial length of the at least one dummy pocket can be made smaller than the axial length of the roller, and / or the minimum circumferential width of the at least one dummy pocket can be made smaller than the outer diameter of the roller.

[0021] In the radial roller bearing cage of the seventh aspect of the present disclosure, in the radial roller bearing cage of the fifth aspect of the present disclosure, the axial length of the at least one dummy pocket can be set to be greater than or equal to the axial length of the roller, and the circumferential width of the at least one dummy pocket can be set to be greater than the outer diameter of the roller.

[0022] In the radial roller bearing cage of the eighth aspect of the present disclosure, in the radial roller bearing cage of any of the first to fourth aspects of the present disclosure, the at least one dummy pocket may be the same shape and size as the plurality of retaining pockets.

[0023] A radial roller bearing according to a ninth aspect of this disclosure comprises a cage and a plurality of rollers.

[0024] In particular, in the radial roller bearing of the ninth aspect of this disclosure, the cage is composed of a radial roller bearing cage according to any of the first to eighth aspects of this disclosure.

[0025] Further, the plurality of rollers are disposed rotatably inside the plurality of retaining pockets.

Advantages of the Invention

[0026] According to the cage for a radial roller bearing and the radial roller bearing of one aspect of the present disclosure, it is possible to prevent only the amount of drop of the rollers held in some of the pockets from becoming small or large.

Brief Description of the Drawings

[0027] [Figure 1] FIG. 1 is a perspective view showing a radial roller bearing according to a first example of an embodiment of the present disclosure. [Figure 2] FIG. 2 is an end view of the radial roller bearing of the first example as viewed from the axial direction. [Figure 3] FIG. 3 is a cross-sectional view taken along the line X-O-X of FIG. 2. [Figure 4] FIG. 4 is a plan view showing an intermediate material produced in a punching process among the manufacturing processes of the cage constituting the radial roller bearing of the first example. [Figure 5] FIG. 5 is a schematic diagram for explaining the arrangement of the dummy pockets of the cage. [Figure 6] FIGS. 6(A) and 6(B) are cross-sectional views showing two other examples of radial roller bearings to which the radial roller bearing of one aspect of the present disclosure can be applied. [Figure 7] FIG. 7 is a perspective view showing a radial roller bearing according to a second example of an embodiment of the present disclosure. [Figure 8] FIG. 8 is a perspective view showing a radial roller bearing according to a third example of an embodiment of the present disclosure. [Figure 9] FIG. 9 is a perspective view showing a radial roller bearing according to a fourth example of an embodiment of the present disclosure. [Figure 10] FIGS. 10(A) and 10(B) are diagrams schematically showing the shapes of the dummy pockets with respect to two examples of a modification of the fourth example. [Figure 11] FIG. 11 is a perspective view showing a radial roller bearing according to a fifth example of an embodiment of the present disclosure. [Figure 12] Figure 12 is a schematic diagram showing the welded joint of a reference example retainer. [Modes for carrying out the invention]

[0028] [Example 1] A first example of the embodiment of this disclosure will be described with reference to Figures 1 to 5.

[0029] In the following description, unless otherwise specified, axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the retainer 2.

[0030] The radial roller bearing 1 comprises a cage 2 and a plurality of rollers 3.

[0031] A radial roller bearing according to one aspect of the present disclosure may further comprise an outer ring and / or an inner ring.

[0032] For example, a radial roller bearing according to one aspect of the present disclosure may be configured as a so-called cage-and-roller system, in which a cage 2 alone holds a plurality of rollers 3 in place to prevent them from falling out, without having an outer ring and an inner ring.

[0033] Alternatively, a radial roller bearing according to one aspect of the present disclosure may be configured as a shell-type radial roller bearing 1a, which includes an outer ring 4 in addition to a plurality of rollers 3 and a cage 2, as shown in Figure 6(A). The outer ring 4 is formed by bending a metal plate and has a substantially U-shaped cross-section. The outer ring 4 comprises a cylindrical portion 6 having an outer ring raceway 5 on its inner circumferential surface, and two side plate portions 7 extending radially inward from both axial ends of the cylindrical portion 6. The two side plate portions 7 are arranged opposite to both axial ends of the cage 2.

[0034] In the illustrated example, both side plates 7 have an annular shape. However, in a shell-type radial roller bearing, one of the two side plates can be provided to close the opening on one axial side of the cylindrical portion. In other words, the outer ring can be configured as a bottomed cylinder.

[0035] The radial roller bearing 1 in this example is composed of a cage and rollers.

[0036] The retainer 2 comprises two rim portions 8, multiple column portions 9, and multiple pockets 10.

[0037] The two rim portions 8 are cylindrical in shape and are arranged coaxially with a gap between them in the axial direction.

[0038] Furthermore, each of the two rim portions 8 has a welded joint 11 at at least one location in the circumferential direction. The welded joint 11 is the portion where the circumferential ends of the rim portions 8 are joined by welding. In this example, each of the two rim portions 8 has a welded joint 11 at one location in the circumferential direction, and the circumferential positions of the welded joints 11 provided on each of the two rim portions 8 coincide with each other. Note that each of the two rim portions may also have welded joints at multiple locations in the circumferential direction.

[0039] Multiple columnar sections 9 are stretched between two rim sections 8 and are arranged with gaps between them in the circumferential direction.

[0040] The shape of each of the multiple columnar sections 9 can be any shape, as long as the rollers 3 can be held freely by the retaining pockets 10a.

[0041] For example, each of the column sections 9 can have a roughly rectangular cross-sectional shape perpendicular to the central axis of the rim section 8. In other words, each of the column sections 9 can be configured in a roughly rectangular column shape.

[0042] Alternatively, each of the columnar sections 9 may have a roughly M-shaped cross-section, as shown in Figure 6(B), in which the axial middle section is radially offset from the axial side sections. In other words, the retainer 2 can also be composed of a so-called M-shaped retainer.

[0043] In this example, each of the column sections 9 has a roughly rectangular cross-sectional shape perpendicular to the central axis of the rim section 8.

[0044] The multiple pockets 10 are surrounded on all four sides by two rim portions 8 and two adjacent column portions 9 in the circumferential direction, and their respective circumferential center positions are arranged at equal intervals in the circumferential direction. In other words, the multiple pockets 10 are arranged at equal pitches in the circumferential direction.

[0045] Each of the multiple pockets 10 has multiple retaining pockets 10a that each hold a roller 3 inside, and at least one dummy pocket 10b that does not hold a roller 3 inside.

[0046] The welded joint 11 is provided in the portion of the two rim portions 8 that surrounds one of the at least one dummy pockets 10b. In other words, the portion of the two rim portions 8 to which the welded joint 11 is provided contains at least one pocket 10, which includes one pocket 10 located on both sides of its axial orientation, and this pocket 10b is defined as the dummy pocket 10b.

[0047] In this disclosure, at least one pocket 10, which includes pockets 10 located on both axial sides of the portion of the two rim portions 8 where welded joints 11 are provided, is designated as a dummy pocket 10b that does not hold rollers 3 inside, as errors in the circumferential width tend to be large. This prevents the amount of roller 3 held in some pockets 10 from becoming smaller or larger than the others.

[0048] Furthermore, in this disclosure, the circumferential center positions of the multiple pockets 10, which include multiple retaining pockets 10a and at least one dummy pocket 10b, are arranged at equal intervals in the circumferential direction. In other words, all pockets 10 provided in the retainer 2 are arranged at equal pitches in the circumferential direction. This prevents the circumferential width dimension of some of the multiple column portions 9 from becoming unnecessarily small, and ensures sufficient strength and rigidity of the retainer 2.

[0049] The retaining pocket 10a holds the roller 3 inside it. In other words, the roller 3 is assembled inside the retaining pocket 10a in a way that prevents it from accidentally coming out. The retaining pocket 10a has a substantially rectangular opening shape when viewed radially, although this is not limited to the above.

[0050] The number of dummy pockets 10b can be one or multiple.

[0051] If there is only one dummy pocket 10b, the dummy pocket 10b is provided only in the portion of the two rim portions 8 that is surrounded on all four sides by the portion where the welded joint 11 is provided and the two column portions 9 that are adjacent in the circumferential direction. In other words, the dummy pocket 10b is provided only in the portion that coincides with the welded joint 11 in the circumferential direction.

[0052] If there are multiple dummy pockets 10b, they can be arranged at equal intervals in the circumferential direction or at unequal intervals in the circumferential direction. The arrangement of the multiple dummy pockets 10b is not particularly limited, but it is preferable that the multiple dummy pockets 10b be arranged such that the following relationship is satisfied.

[0053] It is preferable that the multiple dummy pockets 10b are arranged such that, when the angle between the lines perpendicular to the central axis O of the two rim portions 8 and passing through the circumferential centers of two adjacent dummy pockets 10b in the circumferential direction is θ [deg], the number of pockets 10 is N, and the number of dummy pockets 10b is Nd, the relationship 360 / Nd - 360 / N ≤ θ ≤ 360 / Nd + 360 / N is satisfied. In other words, the angle θ is the angle between two adjacent dummy pockets 10b in the circumferential direction.

[0054] The multiple dummy pockets 10b are more preferably arranged to satisfy the relationship 360 / Nd-180 / N≦θ≦360 / Nd+180 / N, and most preferably θ=360 / Nd. In other words, it is most preferable that the multiple dummy pockets 10b are arranged at equal intervals in the circumferential direction.

[0055] By arranging multiple dummy pockets 10b to satisfy the above relationship, when multiple rollers 3 are incorporated into the cage 2 to form a radial roller bearing 1, it becomes easier to ensure coaxiality between the outer diameter side member, which is positioned radially outward of the radial roller bearing 1, and the inner diameter side member, which is positioned radially inward of the radial roller bearing 1. This makes it possible to prevent the occurrence of unbalanced loads during the operation of the machinery.

[0056] In this example, at least one dummy pocket 10b is composed of multiple dummy pockets 10b, and the multiple dummy pockets 10b are arranged at equal intervals in the circumferential direction.

[0057] Specifically, at least one dummy pocket 10b is composed of three dummy pockets 10b arranged at equal intervals in the circumferential direction. In other words, in this example, the angle θ is 120°. Also, in this example, the number of multiple pockets 10 is 21.

[0058] Furthermore, if welded joints are provided at multiple locations in the circumferential direction of each of the two rim sections, all pockets located around the welded joints shall be considered dummy pockets.

[0059] The dummy pocket 10b can be the same shape and size as the retaining pocket 10a, or it can be made to have a different shape and / or size from the retaining pocket 10a. In other words, the shape and / or circumferential width of the column portion 9 and / or the shape and / or axial width of the rim portion 8 can be made different between the part that makes up the dummy pocket 10b and the part that makes up the retaining pocket 10a.

[0060] If the dummy pocket 10b is made to differ in shape and / or size from the retaining pocket 10a, the dummy pocket 10b may be shaped and / or sized in such a way that it cannot hold the roller 3. That is, the dummy pocket 10b may be shaped and / or sized in such a way that the roller 3 cannot be placed inside it, or it may be shaped and sized in such a way that the roller 3 placed inside it will fall out radially.

[0061] By making the dummy pocket 10b shaped and / or sized in such a way that it cannot hold the roller 3, it is possible to prevent the roller 3 from being incorrectly assembled into the dummy pocket 10b.

[0062] If the dummy pocket 10b is shaped and / or sized such that the roller 3 cannot be placed inside it, the minimum axial length of the dummy pocket 10b can be made smaller than the axial length of the roller 3, and / or the minimum circumferential width of the dummy pocket 10b can be made smaller than the outer diameter of the roller 3.

[0063] If the minimum axial length of the dummy pocket 10b is to be smaller than the axial length of the roller 3, it is not necessary to make the axial length of the dummy pocket 10b smaller than the axial length of the roller 3 across its entire circumferential width; it is sufficient to make it smaller than the axial length of the roller 3 in a portion of the circumferential direction.

[0064] When the minimum axial length of the dummy pocket 10b is made smaller than the axial length of the roller 3, thereby preventing the roller 3 from being placed inside it, it is preferable, though not limited to this, to make the minimum axial length of the dummy pocket 10b 90% or less of the axial length of the roller 3.

[0065] If the minimum circumferential width of the dummy pocket 10b is to be smaller than the outer diameter of the roller 3, it is not necessary to make the circumferential width of the dummy pocket 10b smaller than the outer diameter of the roller 3 along its entire axial length; it is sufficient to make it smaller than the outer diameter of the roller 3 in a portion of the axial direction.

[0066] When the minimum circumferential width of the dummy pocket 10b is made smaller than the circumferential width of the roller 3, thereby preventing the roller 3 from being placed inside it, it is preferable, though not limited to this, to make the minimum circumferential width of the dummy pocket 10b 90% or less of the outer diameter of the roller 3.

[0067] When the dummy pocket 10b is shaped and sized such that the roller 3 placed inside it falls out radially, it is preferable, though not limited to this, that the axial length of the dummy pocket 10b be greater than or equal to the axial length of the roller 3, and that the circumferential width of the dummy pocket 10b be 110% or more of the outer diameter of the roller 3.

[0068] Even when the dummy pocket 10b is shaped and sized such that the roller 3 placed inside it falls out radially, it is preferable that the axial length of the dummy pocket 10b be about the same as the axial length of the retaining pocket 10a in order to ensure the strength and rigidity of the rim portion 8. However, the axial length of the dummy pocket 10b can also be made larger than the axial length of the retaining pocket 10a.

[0069] In this example, the dummy pocket 10b is the same shape and size as the retaining pocket 10a. That is, the dummy pocket 10b has a roughly rectangular opening when viewed from the radial direction.

[0070] Furthermore, since all pockets 10 have the same shape and size, the circumferential width of all the columnar sections 9 is the same. This ensures a good balance between the strength and rigidity of the retainer 2.

[0071] The retainer 2 can be manufactured by punching and bending a metal plate, and then welding the ends on both sides of the rim portion 8 together.

[0072] Specifically, first, an intermediate material 12 having a roughly ladder-shaped planar form, as shown in Figure 4, is obtained by punching out a metal plate such as a steel plate using a press. The intermediate material 12 has a rectangular planar form and comprises two rim portions 13 spaced apart in the direction of its short side, and a plurality of column portions 9 spanning between the two rim portions 13.

[0073] Next, the intermediate material 12 is bent to round the two raw rim portions 13 into a cylindrical shape.

[0074] Next, the ends on both sides in the circumferential direction of the rolled raw rim portion 13 are joined by welding to form a welded joint 11, thereby processing each raw rim portion 13 into a rim portion 8 to create the retainer 2. The method for welding the ends on both sides in the circumferential direction of the rolled raw rim portion 13 (the ends on both sides in the circumferential direction of the rim portion 8) can be carried out by various conventionally known welding methods such as arc welding, laser welding, and resistance welding.

[0075] Furthermore, if welded joints are provided at multiple locations in the circumferential direction of each of the two rim sections, the retainer can be manufactured by rolling up multiple intermediate materials having a roughly ladder-shaped planar shape into a partially cylindrical shape, and then welding together the proximal ends of two adjacent rim sections of the intermediate materials in the circumferential direction.

[0076] Each of the multiple cylinders 3 has a roughly cylindrical shape.

[0077] In a radial roller bearing according to one aspect of the present disclosure, the roller 3 includes a needle having a relatively small diameter and a large ratio of axial length to diameter. The needle has, but is not limited to, a diameter of 6 mm or less and an axial length of 3 times or more its diameter.

[0078] Each of the multiple rollers 3 is positioned inside the retaining pocket 10a of the retainer 2. In this example, the multiple rollers 3 consist of 18 rollers 3.

[0079] Each of the rollers 3 is held inside the holding pocket 10a of the retainer 2 and is rotatably positioned between the outer ring raceway provided on the inner circumferential surface of the outer diameter member and the inner ring raceway provided on the outer circumferential surface of the inner diameter member.

[0080] [Example 2] A second example of the embodiment of this disclosure will be explained with reference to Figure 7.

[0081] In this example of the radial roller bearing 1b, the cage 2a has two dummy pockets 10b. The two dummy pockets 10b are arranged at equal intervals in the circumferential direction. That is, the two dummy pockets 10b are located at two locations on opposite sides in the radial direction. In other words, the angle θ between the lines passing through the circumferential centers of two adjacent dummy pockets 10b is 180°.

[0082] The other components and effects of the second example are the same as those of the first example.

[0083] [Example 3] A third example of the embodiment of this disclosure will be explained with reference to Figure 8.

[0084] In this example of the radial roller bearing 1c, the dummy pocket 10b1 provided in the cage 2b is restricted to a shape and / or size that prevents it from holding the roller 3.

[0085] Specifically, the circumferential width of the dummy pocket 10b1 is smaller than the outer diameter of the roller 3. More specifically, in this example, the circumferential width of the dummy pocket 10b1 is approximately half the outer diameter of the roller 3.

[0086] In this example, it is possible to prevent incorrect assembly of the roller 3 into the dummy pocket 10b1, thereby improving the efficiency of the radial roller bearing 1c assembly work.

[0087] In this example, the axial length of the dummy pocket 10b1 is approximately the same as the axial length of the retaining pocket 10a. However, the axial length of the dummy pocket 10b1 can also be made smaller than the axial length of the retaining pocket 10a.

[0088] The other components and effects of the third example are the same as those of the first and second examples.

[0089] [Example 4] A fourth example of the embodiments of this disclosure will be explained with reference to Figure 9.

[0090] In the radial roller bearing 1d of this example, the axial length of the dummy pocket 10b2 provided in the cage 2c is made smaller than the axial length of the roller 3, so that the dummy pocket 10b2 cannot hold the roller 3. Specifically, the axial length of the dummy pocket 10b2 is approximately half the axial length of the roller 3.

[0091] In this example as well, it is possible to prevent incorrect assembly of the roller 3 into the dummy pocket 10b2, thereby improving the efficiency of the assembly work of the radial roller bearing 1d.

[0092] In this example, the circumferential width of the dummy pocket 10b2 is approximately the same as the circumferential length of the retaining pocket 10a. However, the circumferential width of the dummy pocket 10b2 can also be made smaller than the circumferential width of the retaining pocket 10a.

[0093] In this example, the dummy pocket 10b2 has a roughly rectangular opening shape when viewed from the radial direction. However, the opening shape of the dummy pocket 10b2 can be any shape, as long as it prevents the roller 3 from being placed inside it.

[0094] For example, the dummy pocket 10b2 may have an opening shape that is roughly elliptical or egg-shaped, as shown in Figure 10(A), or an opening shape that is roughly oblong, as shown in Figure 10(B).

[0095] The other configurations and effects of the fourth example and its variations are the same as those of the first to third examples.

[0096] [Example 5] A fifth example of the embodiments of this disclosure will be explained with reference to Figure 11.

[0097] In this example of the radial roller bearing 1e, the dummy pocket 10b3 provided in the cage 2d is shaped and sized such that the roller 3 positioned inside it falls out radially.

[0098] Specifically, the axial length of the dummy pocket 10b3 is greater than or equal to the axial length of the roller 3, and the circumferential width of the dummy pocket 10b3 is greater than the outer diameter of the roller 3. More specifically, in this example, the axial length of the dummy pocket 10b3 is approximately the same as the axial length of the retaining pocket 10a, and the circumferential width of the dummy pocket 10b3 is approximately twice the outer diameter of the roller 3.

[0099] In this example, it is possible to prevent incorrect assembly of the roller 3 into the dummy pocket 10b3, thereby improving the efficiency of the assembly work of the radial roller bearing 1e.

[0100] The composition and effects of the remaining parts of Example 5 are the same as those of Examples 1 and 2.

[0101] [Reference example] An example that falls outside the technical scope of this disclosure is explained in Figure 12.

[0102] In this reference example, the portion of the retainer 2z where the welded joint 11z is formed does not have a dummy pocket.

[0103] To manufacture the retainer 2z in this reference example, first, an intermediate material with straight ends on both sides in the extension direction is obtained by punching out a metal plate. Next, the intermediate material is bent into a cylindrical shape. Then, with the ends on both sides in the circumferential direction of the rolled intermediate material butted together over the entire width, the ends on both sides in the circumferential direction are joined by welding to form a welded joint 11z, thereby manufacturing the retainer 2z.

[0104] In this example, no pocket exists in the area where the welded joint 11z is formed. Therefore, the roller 3 will not be mistakenly assembled into the pocket 10 where errors in the circumferential width are likely to be large due to the influence of the welded joint 11z. [Explanation of Symbols]

[0105] 1, 1a, 1b, 1c, 1d, 1e Radial roller bearings 2, 2a, 2b, 2c, 2d, 2z cage 3 around 4 Outer ring 5 Outer ring track 6. Cylindrical section 7 Side plate part 8 Rim section 9 Pillar section 10 pockets 10a Retaining pocket 10b, 10b1, 10b2, 10b3 Dummy Pockets 11, 11z welded joint 12 Intermediate materials 13. Plain rim section

Claims

1. It has a welded joint at at least one location in the circumferential direction, and two annular rim portions that are spaced apart in the axial direction and coaxially arranged with respect to each other, Multiple columnar sections are stretched between the two rim sections and arranged at intervals in the circumferential direction, The four sides are surrounded by the two rim portions and two adjacent column portions from among the plurality of column portions, and the center positions of each column are arranged at equal intervals in the circumferential direction, Equipped with, Each of the aforementioned multiple pockets has a plurality of holding pockets inside which rollers can roll freely, and at least one dummy pocket inside which the rollers are not held. The welded joint is provided in the portion of the two rim portions that surrounds one of the at least one dummy pockets. Cage for radial roller bearings.

2. The aforementioned at least one dummy pocket is composed of multiple dummy pockets. A cage for a radial roller bearing according to claim 1.

3. The plurality of dummy pockets are arranged such that, when the angle between lines perpendicular to the central axes of the two rim portions and passing through the circumferential centers of two adjacent dummy pockets in the circumferential direction is θ [deg], the number of the plurality of pockets is N, and the number of the plurality of dummy pockets is Nd, the relationship 360 / Nd - 360 / N ≤ θ ≤ 360 / Nd + 360 / N is satisfied. A cage for a radial roller bearing according to claim 2.

4. The aforementioned multiple dummy pockets are arranged at equal intervals in the circumferential direction. A cage for a radial roller bearing according to claim 3.

5. The at least one dummy pocket is shaped and / or sized in such a way that it cannot hold the roller. A cage for a radial roller bearing according to claim 1.

6. The minimum axial length of the at least one dummy pocket is smaller than the axial length of the roller, and / or the minimum circumferential width of the at least one dummy pocket is smaller than the outer diameter of the roller. A cage for a radial roller bearing according to claim 5.

7. The axial length of the at least one dummy pocket is greater than or equal to the axial length of the roller, and the circumferential width of the at least one dummy pocket is greater than the outer diameter of the roller. A cage for a radial roller bearing according to claim 5.

8. The at least one dummy pocket is the same shape and size as the plurality of retaining pockets. A cage for a radial roller bearing according to claim 1.

9. The retainer, When there are multiple items, Equipped with, The cage is composed of a radial roller bearing cage according to any one of claims 1 to 8. The aforementioned multiple rollers are arranged to roll freely inside the aforementioned multiple retaining pockets. Radial roller bearing.

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