CN117616209A

CN117616209A - Retainer for roller bearing and roller bearing

Info

Publication number: CN117616209A
Application number: CN202280048487.3A
Authority: CN
Inventors: 大桥泉美
Original assignee: NTN Corp
Current assignee: NTN Corp
Priority date: 2021-07-15
Filing date: 2022-06-20
Publication date: 2024-02-27
Also published as: JP2023013047A; WO2023286527A1

Abstract

The post of the roller bearing cage has: a pocket surface (22) formed in the axial center region of the pillar and facing the pocket; a first roller guide surface (23) formed in one and the other axial regions of the pillar and protruding toward the pocket from the pocket surface (22) to guide the roller; thinning portions (25) formed at both axial end portions of the pillar portion and retracted from the pocket with respect to the pocket surface (22); and a second roller guide surface (24) which is provided between the first roller guide surface (23) and the thinned portion (25) in the axial direction both end regions of the pillar portion, protrudes toward the pocket than the pocket surface (22), and is retracted from the pocket than the first roller guide surface (23).

Description

Retainer for roller bearing and roller bearing

Technical Field

The present invention relates to a roller bearing cage in which a plurality of rollers are aligned.

Background

As a retainer for a roller bearing including a collar portion, a pillar portion, and a pocket in which a roller is disposed, conventionally, a structure described in japanese patent application laid-open No. 8-312650 (patent document 1) is known. In the cage of the outer diameter guide type, a surface recessed from the outer diameter surface of the collar portion is provided on the outer diameter side surface of the column portion, an outer diameter claw portion is formed on the surface, and in the cage of the inner diameter guide type, a surface recessed from the inner diameter surface of the collar portion is provided on the inner diameter side surface of the column portion, and an inner diameter claw portion is formed on the surface, so that the outer diameter claw portion and the inner diameter claw portion of the needle roller are prevented from scratching an oil film.

In patent document 1, since the circumferential dimension of the pocket is large at the axial center and small at both axial end portions, even though both end portions of the needle roller are always in contact with the pillar portion, there is a concern that lubricating oil is not sufficiently supplied to the contact portion, and an oil film is broken. Therefore, a technique described in Japanese patent application laid-open No. 2001-04250 (patent document 2) is known.

In patent document 2, a bulge is provided in advance so that both ends of the roller become tapered, and oil grooves are provided in advance at both axial end portions of the pocket, so that both end portions of the roller are prevented from contacting both end portions of the pillar.

In addition, in japanese patent application laid-open No. 2009-079674 (patent document 3), the roller stopper protrusion is formed in a shape with rounded corners. Thus, no sharp edge is formed on the roller stopper protrusion to prevent edge contact.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 8-312650

Patent document 2: japanese patent laid-open No. 2001-04250

Patent document 3: japanese patent laid-open No. 2009-079674

Disclosure of Invention

Summary of the invention

Problems to be solved by the invention

However, the above-described conventional roller bearing cage has problems described below. That is, when pocket surfaces facing the pockets are formed at both end portions and a central region of the pillar portion and roller guide surfaces are formed near the center of both end regions of the pillar portion as in the cage of patent document 1, the boundary line between the pocket surfaces at both end portions and the roller guide surfaces becomes a ridge line standing so as to be an edge. In this way, when the both ends of the roller are retarded in the circumferential direction of the cage and the roller is inclined, the boundary edge is brought into edge contact with the roller, and the oil film is broken.

In view of the above-described circumstances, an object of the present invention is to provide a technique for eliminating edge contact when a skew phenomenon of a roller occurs.

Means for solving the problems

For this purpose, the retainer for a roller bearing according to the present invention includes a pair of collar portions facing each other, a plurality of post portions extending in the axial direction of the collar portions and connecting the collar portions to each other, and pockets in which rollers are disposed as spaces defined between the circumferentially adjacent post portions and between the pair of collar portions. The column part has: a pocket surface formed in an axial center region of the pillar portion so as to face the pocket; a first roller guide surface formed in one region and the other region in the axial direction of the pillar portion, respectively, and protruding from the pocket Kong Mianchao toward the pocket to guide the roller; thinned portions formed at both axial end portions of the pillar portion, respectively, and retracted from the pocket than the pocket surface; and a second roller guide surface provided between the first roller guide surface and the thinned portion in the axial direction both end regions of the pillar portion, protruding toward the pocket than the pocket surface, and retracted from the pocket than the first roller guide surface.

According to the present invention, when the roller is skewed, the second roller guide surface guides the roller instead of the first roller guide surface, and therefore, the edge of the outer edge of the first roller guide surface in the axial direction does not come into contact with the roller, and the oil film on the roller surface can be prevented from being broken. Further, the skew angle of the roller is reduced by the second roller guide surface as compared with the conventional one.

As an aspect of the present invention, the pillar portion further has an inclined surface formed between and connected to the first roller guide surface and the second roller guide surface. According to the above aspect, no edge is formed between the first roller guide surface and the second roller guide surface, so even if the roller is skewed to come into contact with the inclined surface, the oil film on the roller surface can be prevented from being broken. The inclined surface may be included in the second roller guide surface. Alternatively, the third roller guide surface may be disposed between the first roller guide surface and the second roller guide surface, for example, the first roller guide surface and the second roller guide surface may be surfaces parallel to the axis, and the third roller guide surface may be an inclined surface not parallel to the axis.

In a preferred aspect of the present invention, the surface of the thinned portion is adjacent to the second roller guide surface, and the boundary line between these surfaces constitutes a ridge line, and the ridge angle of the ridge line is included in the range of 100 ° to 180 °. According to the above aspect, the boundary line is an obtuse angle, and no edge is formed at the boundary line, so that even if the roller is skewed to come into contact with the boundary line, the oil film on the roller surface can be prevented from being broken.

The retainer for a roller bearing of the present invention may further include a roller stopper protrusion that restricts radial movement of the roller. As a further preferable aspect of the present invention, the pillar portion further includes a roller stopper protrusion protruding toward the pocket, the roller stopper protrusion including a first protrusion portion disposed at the same axial direction position as the axial direction position of the first roller guide surface, and a second protrusion portion disposed at the same axial direction position as the axial direction position of the second roller guide surface, a first protrusion amount of the first protrusion portion protruding in the circumferential direction from the first roller guide surface being larger than a second protrusion amount of the second protrusion portion protruding in the circumferential direction from the second roller guide surface. According to the above aspect, the edge of the roller stopper protrusion is less likely to contact the roller, and when the roller is skewed, the roller stopper protrusion contacts the roller at the edge, thereby reducing the risk of oil film breakage.

The roller bearing of the present invention includes the above-described roller bearing cage and rollers disposed in pockets of the roller bearing cage.

Effects of the invention

Thus, according to the present invention, when the roller is skewed, the roller is prevented from coming into contact with the edge of the pillar portion, and thus the oil film break on the roller surface can be eliminated.

Drawings

Fig. 1 is an overall perspective view showing an embodiment of the present invention.

Fig. 2 is an enlarged perspective view showing this embodiment.

Fig. 3 is an enlarged view of the embodiment with one column portion removed.

Fig. 4 is an enlarged view of the embodiment with one column portion removed.

Fig. 5 is a cross-sectional view showing one pocket taken out from this embodiment.

Fig. 6A is an enlarged view showing a cross-sectional shape of the first roller guide surface of this embodiment.

Fig. 6B is an enlarged view showing the cross-sectional shape of the first roller guide surface of this embodiment.

Fig. 7 is an enlarged image showing this embodiment.

Fig. 8 is a cross-sectional view showing the removal of a pocket of the conventional example.

Fig. 9 is a view showing the pocket surface and the roller guide surface of the cage according to the conventional example taken out.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is an overall perspective view showing a roller bearing cage according to an embodiment of the present invention. Fig. 2 is an enlarged perspective view showing this embodiment. The roller bearing cage 10 includes: two pairs of collar portions 11, 11; a plurality of column portions 21 extending along the axial direction of the collar portion 11 and connecting the collar portions 11, 11 to each other; circumferentially adjacent column portions 21, 21 are spaced from each other by a pocket 31 which is a space defined by the pair of collar portions 11, 11. In the following description, the axial direction of the roller bearing cage 10 (the collar portion 11) is simply referred to as the axial direction, the circumferential direction of the roller bearing cage 10 (the collar portion 11) is simply referred to as the circumferential direction, and the radial direction of the roller bearing cage 10 (the collar portion 11) is simply referred to as the radial direction.

The pillar portions 21 face the pockets 31 at both side surfaces in the circumferential direction of the roller bearing retainer 10. Pocket surfaces 22, first roller guide surfaces 23, second roller guide surfaces 24, and thinned portions 25 are formed on the side surfaces of the pillar portion 21. The thinned portion 25 introduces lubricating oil into the pocket 31. Rollers, not shown, are disposed in the pockets 31. The rollers are, for example, needle rollers. The circumferential dimension of the pocket 31 is larger than the diameter of the roller.

Fig. 3 is an enlarged view of one column portion taken out from the embodiment, showing a state of the roller bearing cage 10 as viewed from the radial outside. Fig. 4 is an enlarged view of one column portion taken out from the embodiment, showing a state of the roller bearing cage 10 as viewed in the circumferential direction. The pocket surface 22 is a plane retracted from the pocket 31, whereas the first roller guide surface 23 is a plane protruding toward the pocket 31. That is, the first roller guide surface 23 protrudes toward the pocket 31 from the pocket surface 22 as shown in fig. 3, and is brought into contact with the surface of the roller (not shown) to guide the roller in the circumferential direction. A roller (not shown) is brought into parallel posture with the axis by contacting the first roller guide surface 23 provided on one side in the axial direction of the column 21 and the first roller guide surface 23 provided on the other side in the axial direction of the column 21. The pocket surface 22 is always separated from the roller and does not contact. Thereby, the lubricating oil flows through the gap between the pocket surface 22 and the roller.

The thinned portion 25 is a recess that is retracted from the pocket 31 than the first roller guide surface 23 and the pocket surface 22 as shown in fig. 3. That is, regarding the circumferential dimension of the pillar portion 21, the dimension Cs at the thinned portion 25 is smallest, and the dimension Ca at the first roller guide surface 23 is largest.

As shown in fig. 3, the pocket surface 22 is disposed in the axial center region of the pillar 21. The first roller guide surfaces 23 are disposed in one region and the other region in the axial direction of the column portion 21. The second roller guide surface 24 is disposed at a position axially outside the first roller guide surface 23 and at a position axially outside the first roller guide surface 23. The thinned portions 25 are provided at the junction between the end portions of the column portion 21 and the collar portion 11, specifically, at both end portions of the column portion 21.

The second roller guide surface 24 is retracted from the pocket 31 than the first roller guide surface 23, but protrudes toward the pocket 31 than the pocket surface 22. That is, regarding the circumferential dimension of the pillar portion 21, the dimension Cb at the second roller guide surface 24 is smaller than the dimension Ca, and is larger than the circumferential dimension Cd at the pocket surface 22 (Cs < Cd < Cb < Ca).

The first roller guide surface 23 and the second roller guide surface 24 of the present invention are planes facing the pocket 31. The axial dimension Wa of the first roller guide surface 23 is larger than the axial dimension Wb of the second roller guide surface 24 (Wa > Wb).

Fig. 5 is a sectional view showing a state in which the second roller guide surface 24 guides the rollers, and shows a state in which the pockets are viewed in the radial direction. In a state where the rollers 40 are skewed, the second roller guide surface 24 is brought into contact with the rollers 40 to guide the rollers, and at this time, the axially outer edges 23f of the first roller guide surface 23 are not brought into contact with the rollers 40. According to the present embodiment, the skew angle of the rollers 40 is reduced by the second roller guide surface 24. Further, the second roller guide surface 24 prevents the contact between the axial outer edge 23f and the roller 40, or reduces the load applied from the roller 40 to the axial outer edge 23f even if the roller 40 contacts the axial outer edge 23 f.

Referring to fig. 5, in the present embodiment, the value of the difference in height between the first roller guide surface 23 and the second roller guide surface 24 is represented by the dimension Cf. The size Cf is 0.01[ mm ] or less (Cf.ltoreq.0.01). In this way, the connection of the second roller guide surface 24 and the second roller guide surface 24 is no longer noticeable and the edge is difficult to generate. As a result, as shown by the two-dot chain line, even if the roller 40 is skewed, the roller 40 can be prevented from coming into contact with the edge. The dimensional relationships between the dimension Cf, the dimension Ca, and the dimension Cb (fig. 3) are as follows.

[ 1] Cf= (Ca+Cb)/2

Fig. 6A and 6B are enlarged views showing a space between the first roller guide surface 23 and the second roller guide surface 24, and show a state as viewed in the radial direction. Fig. 7 is an image showing the present embodiment, and shows a state seen from the inclined outer diameter side. In the present embodiment, as shown in fig. 6A, the first roller guide surface 23 and the second roller guide surface 24 are flat surfaces or curved surfaces parallel to the axis, and an inclined surface 26 is formed between the first roller guide surface 23 and the second roller guide surface 24. The inclined surface 26 is not parallel to the axis and smoothly connects to the first roller guide surface 23 and the second roller guide surface 24. Alternatively, as a modification not shown, the inclined surface 26 may be smoothly connected to the first roller guide surface 23 and/or the second roller guide surface 24 via a curved surface.

Fig. 6B shows a modification of the present embodiment, in which the second roller guide surface 24 is an inclined surface that is not parallel to the axis. According to the present embodiment and the modification, the corner angle at the axially outer edge 23f is an obtuse angle, and no step is formed at the boundary between the first roller guide surface 23 and the second roller guide surface 24. Therefore, no edge is formed on the axially outer edge 23f, and even if the roller 40 is skewed and comes into contact with the axially outer edge 23f, the oil film on the surface of the roller 40 can be prevented from being broken. Alternatively, as a modification not shown, the axial outer edge 23f may be formed as a curved surface, and the second roller guide surface 24, which is an inclined surface, may be smoothly connected to the first roller guide surface 23 via the curved surface.

The circle in fig. 5 shows the boundary between the second roller guide surface 24 and the thinned portion 25, and shows a state as viewed in the radial direction. The surface of the thinned portion 25 is adjacent to the second roller guide surface 24, and the boundary line 27 between these surfaces constitutes a ridge line. The ridge extends in a radial direction. In a cross section orthogonal to the ridge line, the ridge angle R formed by the surface of the thinned portion 25 and the second roller guide surface 24 is an obtuse angle included in a range of 100 ° or more and 180 ° or less (preferably less than 180 °). According to the present embodiment, since the corner angle at the boundary line 27 is an obtuse angle, the edge is not formed, and even if the roller 40 is skewed to contact the boundary line 27, the oil film on the surface of the roller 40 is prevented from being broken.

Returning the description to fig. 3 and 4, the roller stopper protrusion 32 is provided in the axial end region of the column portion 21. The roller stopper protrusion 32 is disposed on the outer diameter side of the first roller guide surface 23 and the second roller guide surface 24, and restricts movement of the rollers to the outer diameter side. The roller stopper protrusion 32 is disposed radially outward of the pillar portion 21, protrudes toward the pocket 31, and faces the roller stopper protrusion 32 provided in the same manner as the adjacent pillar portion 21. The distance between the roller stopper protrusions 32, 32 is smaller than the diameter of the roller, so that the roller can be prevented from falling out of the pocket 31.

The axial position of the roller stopper protrusion 32 includes: a first protruding portion 33 disposed at the same axial direction position as the axial direction position of the first roller guide surface 23; and a second protruding portion 34 disposed at the same axial direction position as the axial direction position of the second roller guide surface 24. The first projecting amount Pa of the first projecting portion 33 projecting in the circumferential direction from the first roller guide surface 23 is larger than the second projecting amount Pb of the second projecting portion 34 projecting in the circumferential direction from the second roller guide surface 24. According to the present embodiment, in the skew phenomenon of the roller, even when the roller stopper protrusion 32 abuts against the roller, the contact area increases, so that the oil film on the roller surface can be prevented from being broken.

The conventional example is described for the convenience of understanding the present embodiment. Fig. 8 and 9 are views showing removal of the pocket of the conventional example, and fig. 8 is a cross-sectional view showing a state in which the column portion is cut at a surface (a plane perpendicular to the diameter of the retainer) indicated by VIII-VIII in fig. 9, and the cut surface is viewed in the radial direction. Fig. 9 is an enlarged view showing a pocket surface and a roller guide surface of a conventional example, showing a state in which one column portion is taken out and viewed in the circumferential direction of the cage. Referring to fig. 8, the roller guide surfaces 123 of the conventional example are provided in the axial both end regions of the pillar 121. The axially outer edge 123f of the roller guide surface 123 forms an edge, and constitutes an independent ridge. Therefore, if the roller 40 is skewed to come into contact with the axially outer edge 123f, an oil film break occurs on the surface of the roller 40.

For this reason, the excess material 133, which is a part of the side surface of the column portion 121, is subjected to a polishing process, and the outer claw 132 is formed on the outer diameter side of the column portion 121 by the polishing process. The burnishing process is a process in which a burnishing tool (not shown) is moved in the radial direction and pressed against the circumferential side surface of the pillar 121 (surface continuous with the pocket surface 122 (surface of the residual material 133)), and the residual material 133 of a part of the circumferential side surface of the pillar 121 is plastically deformed so as to cut in the radial direction, so that the outer claws 132 protrude toward the pockets. In the above-described polishing, if the excess material 133 is cut to form the roller guide surface 123 in the conventional example, a sharp protruding edge is formed at the axially outer edge 123f of the roller guide surface 123.

In the present embodiment, since the second roller guide surface 24 is formed on the outer side in the axial direction of the first roller guide surface 23, the edge 123f as in the conventional example is not generated, and the outer edge 23f in the axial direction does not become an edge.

In the present embodiment, the roller stopper projection 38 is provided on the radially inner side of the column portion 21. The roller stopper protrusions 38 are arranged at two positions with a space therebetween in the axial center region of the pillar portion 21, and protrude toward the pocket 31 from the pocket surface 22. The roller stopper projection 38 restricts movement of the roller to the inner diameter side. The roller stopper projection 38 is opposed to the roller stopper projection 38 provided in the same manner as the adjacent column portion 21. The distance between the roller stopper protrusions 38, 38 is smaller than the diameter of the roller, and therefore the roller is prevented from falling out of the pocket 31.

The roller stopper projection 38 is formed by polishing a circumferential side surface of the pillar portion 21 from an outer diameter side to an inner diameter side. The combed pocket surface 39 is located on the outer diameter side of the roller stopper projection 38, protrudes toward the pocket 31 than the pocket surface 22, and is retracted from the pocket 31 than the second roller guide surface 24.

In the present embodiment, as shown in fig. 4, the connection regions 28, 28 of the axial center region and the axial end regions are formed in an inclined shape so that the axial center region of the column portion 21 is located on the inner diameter side of the axial both end regions. The connection regions 28, 28 are formed by press working.

In the rolling process of the strip, the connecting regions 28, 28 are formed by punching the widthwise central region and the widthwise end regions of the strip in a staggered manner. The column portion 21 and the pocket 31 are simultaneously formed by punching the strip with a punch having the same contour as the pocket 31. The strip is cut to an appropriate length, rounded off, and the ends are joined by welding.

As shown in fig. 4, the outer diameter surface of the post 21 is recessed toward the inner diameter side from the outer diameter surface 12 of the ferrule 11. Specifically, the outer diameter surface 35 of the axial end portion of the column portion 21 is the same surface (flat surface or cylindrical surface) as the outer diameter surface 12. The outer diameter surface 36 located axially inward of the outer diameter surface 35 and axially outward of the connection region 28 is a plane that is retracted toward the inner diameter side from the outer diameter surface 35. Thereby, the lubricating oil flows between the outer diameter surface of the roller bearing cage 10 and the roller stopper protrusions 32, and lubricates the roller stopper protrusions 32. The above-described configuration is advantageous when the roller bearing cage 10 is guided by an outer diameter. The outer diameter surface 37 of the central region in the axial direction of the column portion 21 is a plane that is retracted toward the inner diameter side from the outer diameter surface 35. The roller bearing cage 10 of the present embodiment is a V-shaped cage.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the configurations of the illustrated embodiments. Various modifications and variations may be applied to the illustrated embodiments within the same or equivalent scope as the present invention.

Symbol description

The retainer for a roller bearing comprises a retainer for a roller bearing, an 11 collar part, a 21 post part, a 22 pocket surface, a 23 first roller guide surface, a 24 second roller guide surface, an axially outer edge of a 23f first roller guide surface, a 25 thinned part, a 26 inclined surface, a 27 boundary line, a 28 connecting area, a 31 pocket, 32, 38 roller restricting protrusions, 33 first protruding parts, 34 second protruding parts, 40 rollers, R edges, 123 roller guide surfaces, 123f edges, 132 outer claws, 122 pocket surfaces and 133 surplus material.

Claims

1. A cage for a roller bearing, wherein,

the roller bearing cage includes a pair of collar portions, a plurality of post portions extending in an axial direction of the collar portions and connecting the collar portions to each other, and pockets in which rollers are disposed as spaces defined between the circumferentially adjacent post portions and between the pair of collar portions,

the column portion has:

a pocket surface formed in an axial center region of the pillar portion so as to face the pocket;

a first roller guide surface formed in one region and the other region in the axial direction of the pillar portion, respectively, and protruding toward the pocket than the pocket, and guiding the roller;

thinned portions formed at both axial end portions of the pillar portion, respectively, and retracted from the pocket with respect to the pocket surface; and

And a second roller guide surface provided between the first roller guide surface and the thinned portion in both end regions in the axial direction of the pillar portion, protruding toward the pocket than the pocket surface, and retracting from the pocket than the first roller guide surface.

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

the pillar portion further has an inclined surface formed between the first roller guide surface and the second roller guide surface and connected to these roller guide surfaces.

3. The cage for a roller bearing according to claim 1, wherein,

the surface of the thinned portion is adjacent to the second roller guide surface, and the boundary line between these surfaces constitutes a ridge line, and the ridge angle of the ridge line is included in the range of 100 ° to 180 °.

4. The cage for a roller bearing according to claim 1, wherein,

the pillar portion further has a roller stopper protrusion protruding toward the pocket,

the roller stopper protrusion includes: a first protrusion portion disposed at the same axial position as the axial position of the first roller guide surface; and a second protruding portion arranged at the same axial position as the axial position of the second roller guide surface,

a first projecting amount of the first projecting portion projecting in the circumferential direction from the first roller guide surface is larger than a second projecting amount of the second projecting portion projecting in the circumferential direction from the second roller guide surface.

5. A roller bearing is provided with:

the retainer for a roller bearing according to any one of claims 1 to 4; and

And a roller disposed in the pocket.