Cage for radial roller bearing

Abstract

To provide a cage for a radial roller bearing, which has a simple structure, is inexpensive, and can reliably prevent rollers from falling off.SOLUTION: A cage for a radial roller bearing has a pair of annular rim portions 20 that are disposed coaxially and spaced apart in an axial direction, a plurality of column portions 30 that are spaced apart in a circumferential direction and connect outer diameter portions 21 of the pair of rim portions 20 with each other in the axial direction, and a plurality of pocket portions 40 that are formed between the pair of rim portions 20 and a pair of column portions 30 adjacent in the circumferential direction and rotatably accommodate rollers 50. On an inner diameter portion of at least one of the pair of rim portions 20, an embossed portion (roller falling-off prevention portion) 25 is formed integrally with the rim portion 20 at a position radially opposite the column portions 30 to prevent the rollers 50 accommodated in the pocket portions 40 from falling off.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cage for a radial roller bearing. [Background technology]

[0002] BACKGROUND ART Conventionally, various types of cages have been proposed as cages for use in radial roller bearings, which are devised to be capable of holding a large number of rollers so that they do not fall out of their pockets.

[0003] Patent Document 1 discloses a roller bearing cage that includes a main body having a pocket portion and a pair of disk-shaped ribs that protrude radially inward from both ends, and a pair of retaining rings that are connected to the inner peripheral ends of each rib and have multiple claws that can sandwich the rollers in the chord direction and slide against them.Patent Document 1 aims to provide a roller bearing cage that allows the retaining rings to be securely and easily attached to the ribs and is less likely to become misaligned.

[0004] Patent document 2 also discloses a needle roller with a cage that includes a pair of annular members facing each other in the axial direction, a plurality of protrusions with mounting holes provided on the inner diameter side of the annular members at positions corresponding to the column portions, and pin members attached to the mounting holes, to prevent the needle rollers from falling off. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-99162 [Patent Document 2] Japanese Patent Application Publication No. 2019-65882 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the cages described in Patent Documents 1 and 2 both require a separate part in addition to the cage body to prevent the rollers from falling off, which increases the manufacturing cost and assembly man-hours of the separate part, increases the weight, and makes it difficult to disassemble for maintenance, etc. Therefore, there has been a demand for a cage with a simple structure that can reliably prevent the rollers from falling off.

[0007] The present invention has been made in view of the above-mentioned problems, and its object is to provide a cage for a radial roller bearing that has a simple structure, is inexpensive, and can reliably prevent rollers from falling off. [Means for solving the problem]

[0008] Therefore, the above object of the present invention is achieved by the following configuration [1] relating to a cage for a radial roller bearing. [1] A pair of annular rim portions arranged coaxially and spaced apart in the axial direction; a plurality of pillar portions spaced apart in the circumferential direction and connecting outer diameter portions of the pair of rim portions in the axial direction; a plurality of pockets formed between the pair of rim portions and the pair of circumferentially adjacent column portions, the pockets accommodating rollers in a rotatable manner; A cage for a radial roller bearing comprising: A roller dropout prevention portion that prevents the rollers housed in the pocket portions from dropping out is formed integrally with the rim portion on the inner diameter portion of at least one of the pair of rim portions at a position radially opposite the column portion. Cage for radial roller bearings. [Effects of the Invention]

[0009] According to the cage for a radial roller bearing of the present invention, it is possible to prevent the rollers from falling off inexpensively and reliably with a simple structure. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a cage for a radial roller bearing according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] 3 is a perspective view showing a state of rollers held by the cage for the radial roller bearing shown in FIG. 1. FIG. [Figure 4] 4 is a cross-sectional view showing the positional relationship between the column portion, the fall-off prevention portion, and the rollers in FIG. [Figure 5] FIG. 5 is a perspective view of a cage for a radial roller bearing according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a cross-sectional view taken along the line BB in FIG. [Figure 7] 7 is a perspective view showing a state of rollers held by the cage for the radial roller bearing shown in FIG. [Figure 8] FIG. 8 is a perspective view of a cage for a radial roller bearing according to a third embodiment of the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along CC in FIG. [Figure 10] FIG. 10 is a perspective view of a cage for a radial roller bearing according to a fourth embodiment of the present invention. [Figure 11] 11 is a perspective view of the cage for the radial roller bearing of FIG. 10 as viewed from the inner diameter side. [Figure 12] FIG. 12 is a cross-sectional view taken along line DD in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a cage for a radial roller bearing according to the present invention will be described in detail with reference to the drawings.

[0012] (First embodiment) As shown in Figures 1 to 4, the radial roller bearing retainer 10 of this embodiment comprises a pair of rim portions 20, a plurality of pillar portions 30, and a plurality of pocket portions 40, and is integrally formed by pressing a metal plate.

[0013] The pair of rim portions 20 are each formed in a disk shape and are arranged coaxially and spaced apart in the axial direction. The column portions 30 are spaced apart circumferentially at a predetermined interval and axially connect the outer diameter portions 21 of the pair of rim portions 20. As a result, a plurality of pocket portions 40 are formed surrounded by the inner surfaces 22 of the pair of rim portions 20 that face each other in the axial direction and the circumferential side surfaces 31 of a pair of circumferentially adjacent column portions 30. Each of the plurality of pocket portions 40 is capable of rotatably housing a roller 50.

[0014] The inner radius R of the column portions 30 is set to be larger than half the pitch circle diameter PCD of the rollers 50 housed in the pocket portion 40. The circumferential width W1 of the pocket portion 40 is formed to be narrower than the diameter D of the rollers 50. The circumferential width W1 of the pocket portion 40 is the distance in the circumferential direction between a pair of circumferentially adjacent column portions 30. This restricts the movement of the rollers 50 housed in the pocket portion 40 in the radially outward direction, preventing them from falling out of the pocket portion 40 in the radially outward direction.

[0015] Furthermore, a plurality of embossed portions 25 are formed on the inner diameter portion of the inner surfaces 22 of the pair of rim portions 20 at positions radially opposing each of the column portions 30, by embossing from the outside in the axial direction toward the inside. The embossed portions 25 are protrusions formed to protrude axially inward from the inner surface 22 of the rim portion 20. The radius r of a circle connecting the centers of the plurality of embossed portions 25 is set to be smaller than half the pitch circle diameter PCD of the plurality of rollers 50 housed in the pocket portion 40. Furthermore, the distance W2 in the circumferential direction between a pair of circumferentially adjacent embossed portions 25 is set to be smaller than the diameter D of the rollers 50.

[0016] This restricts the movement of the rollers 50 housed in the pocket portion 40 in the radially inward direction, preventing them from falling out in the radially inward direction from the pocket portion 40. In other words, the plurality of embossed portions 25, which are protrusions, function as roller falling-out prevention portions that prevent the rollers 50 from falling out of the pocket portion 40.

[0017] The amount of axial protrusion of the embossed portion 25 is set to a protrusion amount that allows the roller 50 to pass from the inner diameter side to the outer diameter side and prevents the roller 50 from falling from the outer diameter side to the inner diameter side after it has passed. Specifically, the amount of axial protrusion of the embossed portion 25 is preferably such that the deformation of the embossed portion 25 when the roller 50 is pressed from the inner diameter side to the outer diameter side is within the elastic deformation range, but even in the unlikely event that the deformation of the embossed portion 25 reaches the plastic deformation range, it is sufficient as long as an axial protrusion (a portion that contributes to preventing the roller 50 from falling) remains even if only slightly after the plastic deformation.

[0018] 4 shows a so-called cage and roller assembly consisting of a radial roller bearing cage 10 and a plurality of rollers 50 fitted onto the outer circumferential surface of a shaft 60. After the cage and roller assembly is assembled onto the shaft 60, the shaft 60 is present on the inner diameter side, so even if the amount of axial protrusion of the embossed portions 25 is extremely small, the rollers 50 will not fall off to the inner diameter side. In other words, the cage and roller structure of this embodiment is intended to prevent the rollers 50 from falling off before assembly onto the shaft 60, and it is sufficient if the amount of axial protrusion of the embossed portions 25 is small as long as the rollers 50 are prevented from falling off.

[0019] As described above, according to the radial roller bearing cage 10 of this embodiment, there is no need to prepare a separate part for preventing rollers from falling off; simply by forming the embossed parts 25 that protrude axially inward on the inner surfaces 22 of the pair of rim parts 20, the roller falling-off prevention part can be formed integrally with the radial roller bearing cage 10. This makes it possible to prevent rollers from falling off at low cost and reliably with a lightweight and simple structure compared to when a separate part is used.

[0020] (Second embodiment) As shown in Figures 5 to 7, the cage for a radial roller bearing of this embodiment differs from the cage for a radial roller bearing of the first embodiment only in the shape of the roller fall-out prevention portion, i.e., the protrusion, and the other configurations and effects are the same, so the same parts are given the same symbols and descriptions are omitted.

[0021] The roller dropout prevention portions of the cage 10 for a radial roller bearing of this embodiment are formed by crimped portions 26 that are cut and raised at a certain circumferential width on the inner diameter portions of the pair of rim portions 20 at positions radially opposite each of the column portions 30, and then folded back in an approximately U-shape in the axially inward and outer radial directions. Both crimped portions 26 are protrusions formed to protrude axially inward from the inner surfaces 22 of the pair of rim portions 20, and prevent the rollers 50 from falling out.

[0022] (Third embodiment) Next, a radial roller bearing cage according to a third embodiment will be described with reference to Figures 8 and 9. The roller dropout prevention portions of the radial roller bearing cage 10 of this embodiment are formed as bent portions 27 that are cut and raised with a certain circumferential width on the inner diameter portions of the pair of rim portions 20 at positions radially opposing each of the column portions 30, and then bent further axially inward into a substantially L-shape. Both bent portions 27 are protrusions formed to protrude axially inward from the inner surfaces 22 of the pair of rim portions 20, and prevent the rollers 50 from falling out.

[0023] (Fourth embodiment) Next, a radial roller bearing cage according to a fourth embodiment will be described with reference to Figures 10 to 12. In the radial roller bearing cage 10 of this embodiment, narrow annular portions 28 are integrally formed axially inward on the inner diameter portions of the pair of rim portions 20. Furthermore, convex portions 29 are provided on the axially inner end surface 28a of the annular portions 28, extending axially inward from positions radially opposite each of the column portions 30.

[0024] The convex portions 29 are protrusions formed so as to protrude axially inward from the inner surfaces 22 of the pair of rim portions 20, and prevent the rollers 50 from falling off. In addition, the pair of rim portions 20 are formed with a generally U-shaped cross section, which improves the strength of the cage 10 for a radial roller bearing.

[0025] The present invention is not limited to the above-described embodiments, and modifications, improvements, etc. are possible as appropriate. For example, in the above-described embodiments, roller dropout prevention portions are provided on both inner surfaces of a pair of rim portions, but they may be provided on the inner surface of only one of the rim portions. In this case, the structure is further simplified and manufacturing costs can be reduced.

[0026] As described above, the present specification discloses the following: (1) a pair of annular rim portions arranged coaxially and spaced apart in the axial direction; a plurality of pillar portions spaced apart in the circumferential direction and connecting outer diameter portions of the pair of rim portions in the axial direction; a plurality of pockets formed between the pair of rim portions and the pair of circumferentially adjacent column portions, the pockets accommodating rollers in a rotatable manner; A cage for a radial roller bearing comprising: A roller dropout prevention portion that prevents the rollers housed in the pocket portions from dropping out is formed integrally with the rim portion on the inner diameter portion of at least one of the pair of rim portions at a position radially opposite the column portion. Cage for radial roller bearings. According to this configuration, the roller fall-out prevention portion, which is inexpensive and has a simple structure, can reliably prevent the rollers housed in the pockets from falling out.

[0027] (2) The roller dropout prevention portions are protrusions formed on the inner surfaces of the pair of rim portions so as to protrude inward in the axial direction. (1) A cage for a radial roller bearing according to the present invention. According to this configuration, the protrusions serving as roller dropout prevention portions can be formed with a simple structure.

[0028] (3) The protrusion is any one of an embossed portion, a bent portion, and a crimped portion. (2) A cage for a radial roller bearing according to the present invention. According to this configuration, the roller dropout prevention portion can be formed integrally with the rim portion by inexpensive press working.

[0029] (4) The amount of protrusion in the axial direction of the protrusion is set to a protrusion amount that allows the roller to pass from the inner diameter side to the outer diameter side and prevents the roller from falling from the outer diameter side to the inner diameter side after passing. A cage for a radial roller bearing according to (2) or (3). According to this configuration, the rollers can be inserted into the cage from the inner diameter side, and can be stably held while being prevented from falling out. [Explanation of symbols]

[0030] 10. Cage for radial roller bearing 20 Rim 21 Outer diameter of rim 22 Inner surface of rim 25 Embossed section (anti-fallout section, protrusion) 26 Crimping part (roller fall prevention part, protrusion) 27 Bent section (roller fall prevention section, protrusion) 29 Convex part (roller fall prevention part, protrusion) 30 Pillar section 40 Pocket section Around 50 60 shaft

Claims

1. a pair of annular rim portions arranged coaxially and spaced apart in the axial direction; a plurality of pillar portions spaced apart in the circumferential direction and connecting outer diameter portions of the pair of rim portions in the axial direction; a plurality of pockets formed between the pair of rim portions and the pair of circumferentially adjacent column portions, the pockets accommodating rollers in a rotatable manner; A cage for a radial roller bearing comprising: A roller dropout prevention portion that prevents the rollers housed in the pocket portions from dropping out is formed integrally with the rim portion on the inner diameter portion of at least one of the pair of rim portions at a position radially opposite the column portion. Cage for radial roller bearings.

2. The roller dropout prevention portions are protrusions formed on the inner surfaces of the pair of rim portions so as to protrude inward in the axial direction.

2. The cage for a radial roller bearing according to claim 1.

3. The protrusion is one of an embossed portion, a bent portion, or a crimped portion.

3. The cage for a radial roller bearing according to claim 2.

4. the amount of protrusion in the axial direction of the protrusion is set to a protrusion amount that allows the roller to pass from the inner diameter side to the outer diameter side and prevents the roller from falling from the outer diameter side to the inner diameter side after passing.

4. The cage for a radial roller bearing according to claim 2 or 3.

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