JP2014029212A - Retainer for pressed roller bearing, roller bearing and manufacturing method of retainer for pressed roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer for a roller bearing capable of being manufactured with the smaller number of processing man-hours.SOLUTION: In a step of manufacturing a retainer for a roller bearing including on a wall surface opposite to a pocket 20; a first roller stopper located unevenly in a radial inside and preventing a roller from falling to the radial inside; and a second stopper located unevenly in a radial outside and preventing the roller from falling to the radial outside, the first and second stoppers are formed only by processing from a radial one side with a jig 60.

Description

  The present invention relates to a roller bearing retainer manufactured by press working, a needle roller bearing including the roller bearing retainer, and a method for manufacturing the roller bearing retainer.

  Cage and roller type needle roller bearings composed of rollers and cages are often used for idler bearings for automobile transmissions and large rod end bearings for motorcycle engines. As such a bearing, the present applicant has already proposed the following technique.

  A roller bearing cage described in Japanese Patent Application Laid-Open No. 2000-18258 (Patent Document 1) is a machined cage, and has a pocket as a claw for preventing the roller from coming out to the outer diameter side of the cage. An outer claw is formed in the middle part of the column part by machining, for example, when machining to cut out. In addition, inner claws are formed at both ends of the column portion by ironing as a claw for preventing the roller from coming off to the inner diameter side of the cage.

  The roller bearing retainer described in Japanese Patent No. 3665653 (Patent Document 2) is a rolling process retainer that prevents the roller from coming out of the pocket after the step of punching the strip steel into the pocket. A retaining nail is formed. Specifically, the steel strip placed horizontally is ironed downward by an upper claw taking-out jig to form a roller pawl on the lower side of the column portion. Further, ironing is performed upward by a lower nail take-out jig, and a roller pawl is formed on the upper side of the column portion. Next, the steel strip is rolled to form an annular cage in which the lower roller pawl side of the column portion described above is disposed on the outer diameter side.

JP 2000-18258 A Japanese Patent No. 3665653

  In recent years, a demand for cost has increased, and a technique for manufacturing a cage with a smaller number of processing steps has been demanded. When manufacturing the roller bearing retainer by the method described in Patent Document 1, there is room for improvement in processing man-hours because the step of providing the inner claw and the step of providing the outer claw are separate steps. Moreover, when manufacturing the roller bearing retainer by the method described in Patent Document 2, the jig used in the step of providing the inner claw and the jig used in the step of providing the outer claw are pre-rolling processed. There was room for improvement in the processing equipment because it was necessary to install them on both sides of the steel strip.

  In view of the above circumstances, the present invention provides a roller bearing retainer that can be manufactured with simpler processing equipment and a smaller number of processing steps.

  For this purpose, a roller bearing retainer according to the present invention includes a pair of ring-shaped ring portions and a plurality of column portions connecting the pair of ring portions to each other, and a roller between adjacent column portions is provided. The roller bearing retainer is formed with a pocket for housing the first portion, and the column portion is unevenly distributed radially inward on the wall surface facing the pocket to prevent the roller from falling off radially inward. A roller stopper, and a second roller stopper that is unevenly distributed radially outward to prevent the roller from falling off radially outward. The first and second roller stoppers are respectively provided from one radial side. It is formed only by processing.

  According to the present invention, since the first and second roller stoppers are formed only by processing from one side in the radial direction, the jig for forming the first roller stopper and the second roller are formed. It becomes possible to arrange | position the jig | tool which forms a stop part on the same side seeing from a holder | retainer. Therefore, the processing equipment for the roller stopper can be simplified. In addition, the jig for forming the first roller stopper and the jig for forming the second roller stopper can be combined to form the inner and outer diameter roller stoppers in the same process. become. Therefore, the number of processing steps can be reduced as compared with the conventional case.

  The formation of the first and second roller stoppers is not limited to processing from either the radially outer side or the inner side, but is preferably formed only by processing from the radially outer side. . Thereby, the first and second roller stoppers can be easily formed.

  When the first and second roller stoppers are formed only by processing from the radially outer side, specifically, the first roller stopper is inserted into the pocket from the radially outer side by a processing jig. It is a burnish claw formed by squeezing the wall surface facing the pocket of the pillar part. As a result, it is possible to prevent the roller from falling off inward in the radial direction with the burnish claw.

  When the first and second roller stoppers are formed only by processing from the outside in the radial direction, specifically, the second roller stopper is caulked on the outer diameter surface of the column portion by a processing jig. It is a caulking nail that is formed. As a result, it is possible to prevent the rollers from coming off radially outward with the caulking claw.

  The shape of the column portion is not limited to one embodiment, but preferably, the column central portion positioned relatively radially inward in the axial central region and the diameter relatively in the axial end region. A pair of column end portions positioned on the outer side in the direction, and a pair of column inclined portions positioned between the column center portion and each of the pair of column end portions, the first roller stopper portion being the second center portion, The roller stopper is provided at each of the pair of column ends. This makes it possible to reduce the weight while increasing the strength of the cage.

  More preferably, the thickness of each part of the column center part, the pair of column end parts, and the pair of column inclined parts is smaller than the thickness of the boundary part between adjacent parts. As a result, the thickness of the boundary portion can be made thicker than other portions, and the durability against stress concentration can be improved. Accordingly, it is possible to obtain a high-strength roller bearing retainer.

  Moreover, it becomes possible to reduce the contact surface pressure of a contact part by increasing the contact area of a roller and a pillar part. As a result, roller skew can be prevented and wear and seizure of the wall surface can be prevented.

  More preferably, a rib portion extending radially inward from each of the pair of ring portions is further provided, and the thickness of the pair of ring portions and the flange portion is smaller than the thickness of the boundary portion between the ring portion and the flange portion. This makes it possible to obtain a high strength roller bearing retainer by making the boundary portion thicker than other portions.

  A roller bearing according to the present invention includes the roller bearing retainer of the present invention and a plurality of rollers accommodated in a pocket. According to the present invention, a roller bearing that can be manufactured with a smaller number of processing steps can be obtained.

  According to the method of manufacturing a roller bearing retainer according to the present invention, a pair of ring-shaped ring portions, a plurality of column portions connecting the pair of ring portions to each other, and rollers between adjacent column portions are provided. A roller bearing retainer comprising: a pocket to be accommodated; and first and second roller stoppers that are unevenly distributed on a radially inner side and a radially outer side on a wall surface facing the pocket of the pillar portion to prevent the rollers from falling off. And forming a pair of ring portions, a plurality of column portions, and pockets on a cylindrical member as a starting material, and processing the cylindrical member from only one side in the radial direction to form a first roller stopper And a step of processing the cylindrical member only from one side in the radial direction to form the second roller stopper.

  According to this invention, the cylindrical member is processed only from one radial direction to form the first roller stopper, and the cylindrical member is processed only from the radial one side to form the second roller stopper. The first and second roller stoppers can be formed by processing from only one side, and a roller bearing that can be manufactured with fewer processing steps than conventional can be obtained. .

  Preferably, the step of forming the first roller stopper and the step of forming the second roller stopper are performed simultaneously. As a result, the time required for processing can be shortened, and a roller bearing cage that is advantageous in terms of cost can be manufactured in a short time.

  As described above, in the roller bearing retainer of the present invention, the first roller stopper that is radially inward and the second roller stopper that is radially outward are formed only by processing from one side in the radial direction. For this reason, it is possible to simplify the processing equipment for the roller stopper as compared with the prior art. Moreover, it becomes possible to manufacture a roller bearing retainer with fewer processing steps than in the past. Therefore, it is possible to provide a roller bearing that is advantageous in terms of cost.

It is a perspective view which shows the roller bearing retainer which concerns on one Embodiment of this invention. It is a perspective view which shows the needle roller bearing which employ | adopted the cage for roller bearings of FIG. It is a perspective view which shows the structure of the pocket of the cage for roller bearings of FIG. It is sectional drawing of the cage for roller bearings seen from the arrow IV of FIG. It is a modification of the roller bearing retainer shown in FIG. 1 and is a cross-sectional view corresponding to FIG. It is a flowchart which shows the main manufacturing processes of the cage for roller bearings shown in FIG. It is a figure which shows a deep drawing process. It is a figure which shows a punching process. It is a figure which shows a burring process. It is a figure which shows a trimming process. It is a figure which shows the state before the process of the process of forming a column inclination part. It is the figure which looked at the outer type | mold for expansion presses from the axial direction. It is a figure which shows the state in the middle of the process of an expansion press process. It is a figure which shows the state after a process of an expansion press process. It is a figure which shows the process of the thickening process of a boundary part. It is a perspective view which shows the process of forming a pocket. FIG. 17 is a cross-sectional view of the step shown in FIG. 16. FIG. 18 is a cross-sectional view taken along the line AA in FIG. 17 and viewed from the direction of the arrow, showing a state before burnishing. FIG. 18 is a cross-sectional view taken along the line AA in FIG. 17 and viewed from the direction of the arrow, showing a state in which the first roller stopper is formed by burnishing. FIG. 18 is a cross-sectional view taken along the line BB in FIG. 17 and viewed from the direction of the arrow, and shows a state in which a second roller stopper is formed by caulking. It is a perspective view which shows the cage for roller bearings concerning other embodiment of this invention. It is a perspective view which shows the needle roller bearing which employ | adopted the cage for roller bearings of FIG. It is a perspective view which shows the structure of the pocket of the cage for roller bearings of FIG. It is the arrow line view seen from arrow XXIV of FIG. FIG. 25 is a modified example of the roller bearing retainer shown in FIG. 21 and corresponds to FIG. 24. It is a figure which shows a pre-processing process. It is the figure which looked at the inner mold for necking from the axial direction. It is a figure which shows a post-processing process.

  A needle roller bearing 11 and a roller bearing cage 13 (hereinafter simply referred to as “cage 13”) according to an embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view of the cage 13, FIG. 2 is a perspective view of the needle roller bearing 11, FIG. 3 is a perspective view showing the shape of the column portion 15 of the cage 13, and FIG. 4 is an arrow IV in FIG. It is an arrow view seen from the direction.

  First, referring to FIG. 2, the needle roller bearing 11 includes a plurality of needle rollers 12 and a cage 13 that holds the plurality of needle rollers 12. Next, referring to FIG. 1, the retainer 13 includes a pair of ring-shaped ring portions 14 and a plurality of column portions 15 that connect the pair of ring portions 14 to each other. A pocket 20 for accommodating the needle rollers 12 is formed between the adjacent column portions 15.

  In the present specification, the “annular ring portion” refers only to an integral ring portion that is continuous in the circumferential direction. That is, it should be understood that a ring portion in which both ends are joined by welding or the like is not included.

  The column portion 15 includes a column central portion 16 positioned relatively radially inward in the axial central region, a pair of column end portions 17 positioned relatively radially outward in the axial end region, and A column central portion 16 and a pair of column inclined portions 18 positioned between each of the column end portions 17 are included.

  Next, referring to FIGS. 3 and 4, the wall surfaces 16 b, 17 b, 18 b of the column portion 15 facing the pocket 20 guide the rotation of the needle rollers 12. Of these, the wall surface 16b of the column central portion 16 is provided with a first roller stopper 16a that prevents the needle rollers 12 from falling off, a non-contact portion 16c, and an oil groove 16d. A second roller stopper 17 a that prevents the needle rollers 12 from falling off is provided on the wall surface 17 b of the column end portion 17.

  The first roller stoppers 16 a are provided at two locations on the column central portion 16. More specifically, it is located at both axial ends of the column center portion 16 and is unevenly distributed radially inward of the wall surface 16 b of the column center portion 16 facing the pocket 20. Then, the needle rollers 12 are prevented from falling off inward in the radial direction.

  The second roller stopper 17a is provided at each of the pair of column end portions 17. More specifically, it is unevenly distributed on the radially outer side of the wall surface 17 b of the column end portion 17 facing the pocket 20. Then, the needle rollers 12 are prevented from falling off radially outward.

  With such first and second roller stoppers 16a and 17a, even if the needle roller 12 has a small diameter, the needle roller 12 retains the cage while ensuring a sufficient play amount of the needle roller 12. It is possible to effectively prevent the dropout from 13.

  The wall surface 16b is located in the column center portion 16 and is positioned between the two first roller stopper portions 16a. The wall surface 17b is located at the column end 17 and is adjacent to the second roller stopper 17a. The wall surface 18b is in the column inclined portion 18, and is located between the first roller stopper 16a and the wall surface 17b. Further, the wall surfaces 16b, 17b, and 18b constitute a plane having the same height. Further, the wall surfaces 16b, 17b, 18b facing each other across the pocket 20 are parallel to each other. Thereby, the needle roller 12 can be rotated stably.

  The non-contact part 16c is provided in the area | region adjacent to the 1st and 2nd roller stop part 16a radial direction. Since the non-contact part 16c is recessed from the wall surfaces 16b, 17b, 18b, it faces the needle roller 12 with a predetermined gap. The non-contact portion 16c is inclined such that a predetermined gap increases as the distance from the first roller stopper portion 16a increases in the radial direction.

  Specifically, the non-contact part 16c is provided in the area | region of the radial direction outer side of the 1st roller stopper part 16a, and inclines so that the clearance gap with the needle roller 12 may increase toward a radial direction outer side. .

  As a result, the amount of lubricating oil flowing into the first roller stopper 16a increases. As a result, the oil film breakage of the first roller stopper 16a can be prevented.

  The oil groove 16d is provided on both axial sides of the first roller stopper 16a. The oil groove 16d has a shape extending in the radial direction and is further recessed than the non-contact portion 16c. Thereby, the quantity of the lubricating oil which flows to radial direction can be increased, and the oil permeability of the radial direction of the holder | retainer 13 can be improved. The improvement in oil permeability contributes to the removal of wear powder and the suppression of the temperature rise of the needle roller bearing 11.

  Further, since the lubricating oil overflowing from the oil groove 16d is supplied to the adjacent first roller stoppers 16a and the wall surfaces 16b, 17b, and 18b, oil film breakage of these first roller stoppers 16a and the like is prevented. can do.

In the column portion 15 having the above-described configuration, the wall thickness t ₁ of the column central portion 16, the column end portion 17, and the column inclined portion 18 (hereinafter collectively referred to as “linear portion”) is set to be substantially equal. Yes. On the other hand, the thickness t ₂ of the boundary portion between the column central portion 16 and the column inclined portion 18 and the boundary portion between the column end portion 17 and the column inclined portion 18 (hereinafter collectively referred to as “boundary portion”) is It is thicker than the wall thickness t ₁ of the straight line portion (t ₁ <t ₂ ). Thereby, the intensity | strength of a boundary part improves relatively. As a result, the durability performance of the cage 13 can be improved even if the stress during rotation of the bearing is concentrated on the boundary portion. The wall thickness refers to a thickness dimension between the inner diameter surface and the outer diameter surface.

Further, the thickness t ₁ of the straight line portion and the curvature radius r of the boundary portion satisfy the relationship r <t ₁ . If the curvature radius r of the boundary portion is reduced, the axial length of the linear portion adjacent to the boundary portion can be increased, that is, the surface area of the linear portion can be increased. As a result, the contact surface pressure during rotation of the bearing can be reduced.

  Specifically, when the cage 13 is an outer diameter side guide (housing guide), the outer diameter surface of the column end portion 17 comes into contact with the housing (not shown). Therefore, if the curvature radius r of the boundary portion between at least the column end portion 17 and the column inclined portion 18 is within the above range, the contact surface pressure between the outer diameter surface of the column end portion 17 and the housing is reduced. can do.

  Further, the surface roughness Ra of the outer diameter surfaces of the ring portion 14 and the column end portion 17 is set to 0.05 μm or more and 0.3 μm or less. Thereby, the abrasion by the contact of the outer diameter surface of the ring part 14 and the column end part 17 and the housing can be prevented. “Surface roughness Ra” refers to arithmetic average roughness.

  On the other hand, when the cage 13 is an inner diameter side guide (rotary shaft guide), the inner diameter surface of the column central portion 16 and the rotation shaft (not shown) are in contact with each other. Therefore, if the curvature radius r of the boundary portion between at least the column central portion 16 and the column inclined portion 18 is within the above range, the contact surface pressure between the inner diameter surface of the column central portion 16 and the rotating shaft is reduced. can do. In this case, the surface roughness Ra of the inner diameter surface of the column central portion 16 may be set to 0.05 μm or more and 0.3 μm or less.

In addition, as for a boundary part, R part is formed in the convex side (side where tensile stress acts at the time of bending) and the concave side (side where compressive stress acts at the time of bending), respectively. At this time, the curvature radius on the convex side is always larger than the curvature radius on the concave side. Therefore, “the radius of curvature r of the boundary portion” in this specification refers to the radius of curvature on the convex side. Further, the “thickness t _{2 of the} boundary portion” refers to the length of a line segment connecting the central portion on the convex side and the central portion on the concave side.

  Further, the outer diameter surface of the column central portion 16 is located on the radially outer side than the inner diameter surface of the column end portion 17. The pitch circle 12 a of the needle roller 12 is located on the radially inner side from the outer diameter surface of the column central portion 16 and on the radially outer side from the inner diameter surface of the column end portion 17. Thereby, the needle roller 12 contacts each of wall surface 16b, 17b, 18b. Thus, the skew of the needle roller 12 can be effectively prevented by increasing the contact area between the needle roller 12 and the wall surfaces 16b, 17b, 18b.

  However, the positional relationship between the column center portion 16 and the column end portion 17 is not limited to the above case. A modified example of the cage 13 will be described with reference to FIG. FIG. 5 is a view showing a modification of the cage 13 and corresponds to FIG. In addition, since the shape and function of each component are common, the same reference number as FIG. 4 is attached | subjected to the same component, and description is abbreviate | omitted.

  Referring to FIG. 5, the outer diameter surface of the column center portion 16 is located on the radially inner side with respect to the inner diameter surface of the column end portion 17. The pitch circle 12 a of the needle roller 12 is located on the radially outer side from the outer diameter surface of the column center portion 16 and on the radially inner side from the inner diameter surface of the column end portion 17. In this case, the needle roller 12 is guided only on the wall surface 18 b of the column inclined portion 18. If it is set as the above-mentioned composition, since the 1st roller stop part 16a and the 2nd roller stop part 17a are arranged away in the diameter direction, drop-off of needle roller 12 can be prevented appropriately.

  Next, with reference to FIGS. 6-20, the manufacturing method of the holder | retainer 13 is demonstrated. FIG. 6 is a flowchart showing main manufacturing steps of the cage 13, and includes first to sixth steps. 7 to 10 are explanatory views showing details of the first step, FIGS. 11 to 14 are explanatory views showing details of the second step, and FIG. 15 is an explanatory view showing details of the third step. 16-20 is explanatory drawing which shows the detail of a 5th process.

  First, as a starting material for the cage 13, a steel plate (carbon steel) having a carbon content of 0.15 wt% or more and 1.1 wt% or less is used. Specifically, SCM415 or S50C having a carbon content of 0.15 wt% or more and 0.5 wt% or less, or SAE1070 or SK5 having a carbon content of 0.5 wt% or more and 1.1 wt% or less. This is because carbon steel having a carbon content of less than 0.15 wt% is hard to form a carburized hardened layer by quenching, and it is necessary to perform carbonitriding to obtain the required hardness for the cage 13. Because. Note that the carbonitriding process has a higher equipment cost than each quenching process described later, and as a result, the manufacturing cost of the needle roller bearing 11 increases. In addition, in carbon steel having a carbon content of less than 0.15 wt%, a sufficient carburized hardened layer may not be obtained even by carbonitriding, and surface-origin type peeling may occur early. On the other hand, the workability of carbon steel having a carbon content exceeding 1.1 wt% is significantly reduced.

The starting material of the cage 13 may be SPC having a carbon content of 0.15 wt% or less. This facilitates burnishing and caulking, which will be described later.

  In the first step S11 shown in FIG. 6, the cylindrical member 22 is formed from the flat steel plate as the starting material. Specifically, referring to FIG. 7, a cup-shaped member 21 is obtained from a steel plate by deep drawing. At this time, a bottom wall 21a is formed at one axial end portion (upper side in FIG. 7) of the cup-shaped member 21, and an outward flange portion 21b is formed at the other axial end portion (lower side in FIG. 7). The At this time, the surface roughness Ra of the outer diameter surface or inner diameter surface of the cup-shaped member 21 is set to 0.05 μm or more and 0.3 μm or less by ironing.

  Next, referring to FIG. 8, the bottom wall 21a of the cup-shaped member 21 is removed by punching. However, the bottom wall 21a cannot be completely removed by punching, and an inward flange portion 21c is formed at one end of the cup-shaped member 21 in the axial direction.

  Next, referring to FIG. 9, the inward flange portion 21c is raised in the axial direction by burring. Further, referring to FIG. 10, the outward flange portion 21b is removed by cutting the other axial end portion of the cup-shaped member 21 by trimming.

  Thereby, the cylindrical member 22 shown in FIG. 10 can be formed. The outer diameter size of the cylindrical member 22 obtained in the above process matches the outer diameter size of the column central portion 16. In addition, the thickness of the cylindrical member 22 obtained in the above process is t.

  Next, in the second step S12 shown in FIG. 6, the cylindrical member 22 is deformed in the radial direction to form the column central portion 16, the pair of column end portions 17, and the pair of column inclined portions 18. In this embodiment, an outer mold 24 for expanding press that restrains the outer diameter surface of the cylindrical member 22 (hereinafter simply referred to as “outer mold 24”) and a pair of expanding presses that restrain the inner diameter surface of the cylindrical member 22. Using the inner dies 25 and 26 (hereinafter, simply referred to as “inner dies 25 and 26”), both end portions in the axial direction of the cylindrical member 22 are expanded (expansion press).

  Referring to FIGS. 11 to 14, the outer mold 24 has a cylindrical space 23 a that receives the cylindrical member 22 therein. The surface of the outer mold 24 facing the cylindrical space 23a has a small diameter portion 23b that matches the outer diameter size of the column central portion 16, a large diameter portion 23c that matches the outer diameter size of the column end portion 17, and a small diameter portion 23b. And between the large diameter part 23c, it is comprised by the inclination part 23d which corresponds to the inclination angle of the column inclination part 18. As shown in FIG.

  The first inner mold 25 is a columnar member that is inserted from one axial end (the upper side in FIG. 11) of the hollow cylindrical member 22. The first inner mold 25 includes a small diameter portion 25a that matches the inner diameter size of the column center portion 16, a large diameter portion 25b that matches the inner diameter size of the column end portion 17, and the small diameter portion 25a and the large diameter portion 25b. It is comprised with the inclination part 25c which corresponds to the inclination angle of the column inclination part 18. FIG. The second inner mold 26 has the same configuration, and is inserted from the other axial end of the cylindrical member 22 (lower side in FIG. 11).

  The outer mold 24 is constituted by, for example, first to fourth divided outer molds 24a, 24b, 24c, and 24d that are radially divided at intervals of 90 °. The first to fourth divided outer dies 24 a to 24 d can be moved in the radial direction of the cylindrical member 22 by a moving jig 27. The first and second inner dies 25 and 26 are movable in the axial direction of the cylindrical member 22, respectively.

  Referring to FIG. 11, when the first to fourth divided outer dies 24a to 24d are retracted radially outward, and the first and second inner dies 25 and 26 are retracted in the axial direction so as to move away from each other, the cylindrical member 22 can be put in and out of the cylindrical space 23a. That is, retreat means moving in a direction away from the cylindrical member 22.

  Next, referring to FIG. 13, when the first to fourth divided outer dies 24a to 24d advance inward in the radial direction, the outer diameter surface of the cylindrical member 22 is restrained by the small diameter portion 23b. Further, referring to FIG. 14, when the first and second inner dies 25, 26 are advanced in the axial direction so as to approach each other, the cylindrical member 22 is inclined by the inclined portions 25c, 26c and then by the large diameter portions 25b, 26b. Both end portions in the axial direction are spread outward in the radial direction. That is, the forward movement means moving in a direction approaching the cylindrical member 22.

Thereby, the pillar center part 16, a pair of pillar edge part 17, and a pair of pillar inclination part 18 are each formed. Since the cylindrical member 22 is stretched by the expansion press, the wall thickness t ₁ of the pair of column end portions 17 and the pair of column inclined portions 18 after the second step is larger than the wall thickness t of the cylindrical member 22. It is thin (t ₁ <t). The cylindrical member 22, since the pressure narrow in the radial direction by the outer mold 24 and inner mold 25, the thickness t ₁ of the second step after the end of the column center portion 16, the thickness of the cylindrical member 22 It is thinner than t (t ₁ <t). Incidentally, the thickness t ₁ is the column center part 16, a represent the pair of column ends 17, and the thickness of the pair of column sloped portion 18 comprehensively, the thickness of 16, 17 and 18 are the same It does not mean that.

  Next, in the third step S13 shown in FIG. 6, the boundary portion is thickened by the thickening process.

  Referring to FIG. 15, a pair of cylindrical compression jigs 28 and 29 are used for the thickening process. Specifically, in a state where the cylindrical member 22 is constrained by the outer mold 24 and the inner molds 25 and 26 (a state where the expansion press is performed), both end surfaces in the axial direction of the cylindrical member 22 by the pair of compression jigs 28 and 29. Compress from both sides.

At this time, since the inner and outer diameter surfaces of the straight portion are constrained by the outer mold 24 and the inner molds 25 and 26, the wall thickness does not change. On the other hand, a minute gap is formed between the boundary portion and the outer mold 24 and the inner molds 25 and 26. Thereby, while the axial direction dimension of the cylindrical member 22 reduces, only a boundary part is thickened. Thickness t ₂ of the boundary after the third step is thicker than the thickness t of the cylindrical member 22 obtained in the first step (t1 <t <t2). Accordingly, the thickness of the column portion 15 is not increased overall to improve the strength, but the thickness of the straight portion is reduced, and the thickness of the boundary portion where stress concentration occurs is selectively increased. Improve strength. Therefore, the cage 13 can be reduced in weight. At this time, the radius of curvature r of the boundary portion is also smaller than the thickness t _{1 of the} straight portion.

  Next, in the fourth step S <b> 14 shown in FIG. 6, the pocket 20 and the oil groove 16 d are formed in the cylindrical member 22. Specifically, a plurality of pockets 20 and oil grooves 16d are formed on the circumferential surface of the cylindrical member 22 by punching using a punch and a die. The punch includes a rectangular portion corresponding to the pocket 20 and a protruding portion corresponding to the oil groove 16d that protrudes in the circumferential direction from the rectangular portion. In this way, by subjecting the cylindrical member 22 to pocket removal, the wall surfaces 16b, 17b, 18b facing each other across the pocket 20 are parallel to each other.

  Next, in a fifth step S15 shown in FIG. 6, the first roller stopper 16a and the second roller stopper 17a are formed on the column portion 15 of the cylindrical member 22. FIG. 16 is a perspective view showing how the roller stoppers 16a and 17a are formed by the jigs 60 to 72. FIG. FIG. 17 is a partial sectional view showing the cylindrical member 22 and the processing table 61 of FIG. A cylindrical working table 61 is coaxially inserted from one axial direction into the cylindrical member 22 in which the pocket 20 is formed. As shown in FIG. 17, the processing table 61 includes an inner diameter surface of the column central portion 16, an inner diameter surface of one column inclined portion 18, an inner diameter surface of one column end portion 17, and an inner diameter of one ring portion 14. Supports these in contact with the surface. A cylindrical processing table 65 is coaxially inserted into the cylindrical member 22 from the other axial direction. As shown in FIG. 17, the work table 65 is biased by a spring 67 so as to advance from the cylinder-shaped work table base 66. Then, the tip protrusion 65 t of the processing table 65 inserted into the cylindrical member 22 engages with the tip recess 61 u of the processing table 61, so that the processing table 65 has an inner diameter surface of the other column inclined portion 18 and the other column end portion 17. These are in contact with and support the inner diameter surface of the other ring portion 14.

  The jig 60 disposed on the outside in the radial direction of the processing table 61 and the processing table 65 extends in the radial direction, and the tip thereof is directed to the processing table 61. A burnishing jig 62 and a caulking jig 63 are provided at the tip of the jig 60. On the other hand, the base end 68 of the jig 60 is engaged with an actuator 71 and an actuator 72 that move the jig 60 forward and backward toward the work table 61.

  As shown in FIG. 17, the burnishing jig 62 is provided at two positions at an end in the axial direction at the tip of the jig 60. This interval is slightly smaller than the axial dimension of the column central portion 16, and the burnishing jig 62 forms the first roller stoppers 16 a at both ends of the column central portion 16 only by processing from one side in the radial direction.

  Further, as shown in FIG. 17, the caulking jig 63 is also provided at two positions with an axial interval at the tip of the jig 60. This interval is the same as the distance between the pair of column end portions 17, 17, and the caulking jig 63 has a second roller stopper 17 a at the pair of column end portions 17, 17 only by processing from one side in the radial direction. Form each one.

FIG. 18 is a cross-sectional view taken along the line AA shown in FIG. 17 and viewed from the direction of the arrow, and schematically shows burnishing by the burnishing jig 62. As shown in FIG. 18, the processing table 61 includes a guide surface 61 a for guiding the burnishing jig 62, and the guide surfaces 61 a facing each other in parallel form a guide groove 61 g corresponding to the pocket 20. The circumferential width of the guide groove 61g is narrower by 2 × W ₁ than the circumferential width of the pocket 20. That is, the guide surface 61a is positioned in front by a width W ₁ than the wall surface of the column center portion 16 facing the pocket 20. The circumferential width of the tip end portion 62a of the burnishing jig 62 is the same as the groove width of the guide groove 61g, and the wall surface of the tip end portion 62a coincides with the guide surface 61a. When the burnishing jig 62 is pushed into the pocket 20 for burnishing, the guide groove 61g receives the tip 62a. On the other hand, the base portion 62b of the burnishing jig 62 that supports the tip end portion 62a has a larger circumferential width than the tip end portion 62a, and the wall surface 62c of the base portion 62b increases in the circumferential width as the distance from the tip end portion 62a increases. Inclined. The circumferential width on the distal end side of the base 62b is 2 × W ₂ wider than the circumferential width of the pocket 20. That is, the distal end side of the wall surface 62c is located at the back by a width W ₂ than the wall surface of the column center portion 16 facing the pocket 20. A step 62d is provided between the tip of the wall surface 62c and the wall surface of the tip portion 62a. The step 62d is a wall surface inclined more steeply than the wall surface 62c.

FIG. 19 is a cross-sectional view taken along the line AA shown in FIG. 17 and viewed from the direction of the arrow, and schematically shows a state where the burnishing jig 62 is pushed into the pocket 20 by burnishing. Wall 62c of the burnishing jig 62, as well as push the wall of the column center portion 16 in the circumferential direction by W _2, the first roller stopper portion 16a pushes away radially inwardly (hereinafter also referred to as burnishing pawl 16a ) And the non-contact portion 16c. The non-contact portion 16 c is formed in a shape that is inclined along the end surface 62 c on the radially outer side of the column central portion 16. The first roller stopper portion 16a is formed to protrude radially inward of the column center part 16 by a width W _1.

  FIG. 20 is a cross-sectional view taken along the line BB shown in FIG. 17 and viewed from the direction of the arrow, and shows a state where the caulking tool 63 is pressed against the column end portion 17 by caulking. The caulking tool 63 compresses and deforms the outer diameter surface of the column end portion 17 and narrows the width of the pocket 20 on the radially outer side to make the second roller stopper 17a (hereinafter also referred to as caulking claw 17a). Form.

  As shown in FIGS. 16-20, the 1st roller stop part 16a and the 2nd roller stop part 17a are formed only by the process from the radial direction outer side of the cylindrical member 22 processed by the cage 13 for roller bearings. Is done. The first roller stopper 16a and the second roller stopper 17a may be formed separately in terms of time, but preferably are simultaneously formed by a jig 60 as shown in FIGS. . This shortens the time required for processing and improves the manufacturing efficiency of the roller bearing retainer 13.

  Although not shown in the drawing, the first roller stopper 16a and the second roller stopper 17a may be formed only by processing the roller bearing retainer 13 from the radially inner side. In this case, the radially inner roller stopper is a caulking claw, and the radially outer roller stopper is a burnishing claw.

  Next, in 6th process S16 shown in FIG. 6, in order to provide predetermined | prescribed mechanical properties, such as surface hardness, to the holder | retainer 13, heat processing is performed. As the heat treatment, it is necessary to select an appropriate method depending on the carbon content of the starting material in order for the cage 13 to obtain a cured layer having a sufficient depth. Specifically, in the case of a material having a carbon content of 0.15 wt% or more and 0.5 wt% or less, carburizing and quenching treatment is performed, and in the case of a material having a carbon content of 0.5 wt% or more and 1.1 wt% or less. Performs bright quenching or induction quenching.

  The carburizing and quenching process is a heat treatment method utilizing the phenomenon that carbon dissolves in high-temperature steel, and a surface layer (carburized hardened layer) with a large amount of carbon can be obtained while the amount of carbon in the steel is low. . Thereby, the surface is hard, the inside is soft, and the property with high toughness is obtained. Moreover, the equipment cost is low compared with the carbonitriding equipment.

  The bright quenching process refers to a quenching process performed while preventing oxidation of the steel surface by heating in a protective atmosphere or vacuum. In addition, the equipment cost is low compared with carbonitriding equipment and carburizing and quenching equipment.

  Induction hardening is a method of making a hardened hardened layer by rapidly heating and rapidly cooling the steel surface using the principle of induction heating. Compared to other quenching treatment facilities, there is a merit that the equipment cost is significantly lower and that the gas is not used in the heat treatment process, so that it is environmentally friendly. It is also advantageous in that a partial quenching process can be performed.

  Furthermore, it is desirable to perform tempering after the above-mentioned quenching treatment in order to reduce residual stress and internal strain caused by quenching and to improve toughness and stabilize dimensions.

  The holder 13 shown in FIG. 1 is completed by the first step S11 to the sixth step S16 described so far. The surface roughness Ra of the outer diameter surface of the cage 13 is already 0.05 μm or more and 0.3 μm or less in the ironing process when the cylindrical member 22 is formed (S11). Therefore, an independent grinding process as a finishing process can be omitted.

  By performing the first to sixth steps S11 to S16 described above, the cage 13 can be formed. Then, the needle roller 12 shown in FIG. 2 is completed by press-fitting the needle roller 12 into the pocket 20 of the cage 13.

  By the way, according to the present embodiment, the first and second roller stoppers 16a and 17a are formed only by processing from one side in the radial direction, so that the jig for forming the first roller stopper 16a is formed. 62 and the jig 63 forming the second roller stopper can be disposed on the same side as viewed from the cage 13. Therefore, the processing equipment for the roller stoppers 16a and 17a can be simplified. In addition, the jig 62 for forming the first roller stopper 16a and the jig 63 for forming the second roller stopper 17a are grouped into a jig 60, and two types of roller stoppers are formed in the same step S15. 16a and 17a can be formed. Therefore, the number of processing steps can be reduced as compared with the conventional case. Further, by providing the roller stoppers 16a and 17a on the wall surfaces 16b and 17b facing the pockets of the column part 15, even if the roller has a small diameter, the roller can be retained while ensuring a sufficient play amount of the roller. It is possible to prevent the container 13 from falling off.

  Further, in the fifth step S15 of the present embodiment, the roller stoppers 16a and 17a are formed by burnishing and caulking, so that the roller stoppers are formed by machining by cutting as described in Patent Document 1. The strength of the roller stopper is greater than that of the conventional cage, which is advantageous in durability performance.

  In addition, since the cage 13 is formed from the cylindrical member 22 that is seamless in the circumferential direction in the first step S11 of the present embodiment, the steel strip is rolled and joined by welding as described in Patent Document 2. Compared to the conventional cage, the strength is higher and the durability is advantageous.

  Further, according to the present embodiment, as shown in FIGS. 16 and 17, the first and second roller stoppers 16 a and 17 a are formed only by processing from the radially outer side of the cage 13. It is possible to easily form the roller stopper 16a on the inner side in the direction and the roller stopper 17a on the outer side in the radial direction.

  As shown in FIGS. 18 and 19, the first roller stopper 16 a has a wall surface facing the pocket 20 of the column portion 15 (16) by a processing jig 62 inserted into the pocket 20 from the radially outer side. It is a burnish claw formed by squeezing. Thereby, it becomes possible to prevent the roller 12 from dropping out inward in the radial direction by the burnishing claw 16a.

  As shown in FIG. 20, the second roller stopper 17 a is a caulking claw that is formed by caulking the outer diameter surface of the pillar portion 15 (17) with the processing jig 63. As a result, the caulking claw 17a can prevent the rollers 12 from dropping out radially outward.

  In particular, in the present embodiment, the column portion 15 includes a column central portion 16 that is positioned relatively radially inward in the axial center region and a pair of columns that are positioned relatively radially outward in the axial end region. It includes end portions 17, 17 and a column center portion 16 and a pair of column inclined portions 18, 18 positioned between each of the pair of column end portions 17, 17. In addition, the second roller stopper 17a is provided at each of the pair of column end portions 17 and 17. This makes it possible to reduce the weight of the cage 13 while increasing the strength.

The Figure 4 and column center portion 16, the thickness t ₁ of each part of the pair of column end portions 17, and the pair of column sloped portions 18, 18 shown in FIG. 5, the thickness of the boundary portions of adjacent respective parts t Less than ₂ . Thereby, the intensity | strength of a boundary part can be enlarged relatively and the durability performance of the holder | retainer 13 can be improved.

  And according to the roller bearing 11 provided with the holder | retainer 13 which becomes this embodiment, and the some roller 12 accommodated in the pocket 20, since the processing man-hours of the roller stopper parts 16a and 17a become fewer than before. This is advantageous in terms of cost.

  The manufacturing method of the cage 13 according to this embodiment includes a pair of ring-shaped ring portions 14, a plurality of column portions 15 that interconnect the pair of ring portions 14 and 14, and adjacent column portions 15. A pocket 20 for accommodating the roller 12 therebetween, and wall surfaces 16b, 17b facing the pocket 20 of the column portion 15 are first and second unevenly distributed on the radially inner side and the radially outer side to prevent the rollers from dropping off. When manufacturing a roller bearing retainer 13 including a roller stopper, a step of forming a pair of ring portions 14, 14, a plurality of column portions 15, and a pocket 20 in a cylindrical member 22 as a starting material; A process of forming the first roller stopper 16a by processing the cylindrical member 22 only from one radial direction, and a process of forming the second roller stopper 17a by processing the cylindrical member 22 only from one radial side. Including. Since the first roller stopper 16a unevenly distributed radially inward and the second roller stopper 17a unevenly distributed radially outward are formed by processing only from one side in the radial direction as described above, the number of processing steps is conventionally reduced. It is possible to manufacture the cage 13 that is advantageous in terms of cost.

  In particular, as shown in FIGS. 16 and 17, the process of forming the first roller stopper 16a and the process of forming the second roller stopper 17a are performed at the same time, thereby reducing the processing time. Therefore, the cage 13 which is advantageous in terms of cost can be manufactured.

  Next, with reference to FIGS. 21 to 28, a cage 33 and a method for manufacturing the same according to another embodiment of the present invention will be described. In addition, the same reference number as the retainer 13 is attached | subjected to a common component and description is abbreviate | omitted.

First, with reference to FIGS. 21 to 25, the retainer 33 further includes a pair of flange portions 19 extending radially inward from each of the pair of ring portions 14. Note that the thickness of the ring portion 14 and the axial thickness of the flange portion 19 are set to be substantially equal to the thickness t ₁ of the straight portion of the column portion 15. Further, the thickness of the boundary portion between the ring portion 14 and the flange portion 19 is thick t ₂ is substantially equal to the settings of other boundary. Further, the curvature radius of the boundary portion between the ring portion 14 and the flange portion 19 is set to be substantially equal to the curvature radius r of the other boundary portion.

That is, t ₁ <t ₂ is also established in this embodiment. Thereby, in addition to the effect already demonstrated, the intensity | strength of the root part of the collar part 19 improves. In addition, r <t ₁ is also established. Thereby, since the surface area of the outer diameter surface of the ring part 14 increases, when the retainer 33 is an outer diameter side guide, the contact surface pressure with the housing can be further reduced. In addition, since the other structure is common with the holder | retainer 13, description is abbreviate | omitted.

  The manufacturing process of the cage 33 having the above-described configuration is common to the first step S11, the second step S12, the fourth step S14, and the fifth step S15 of the cage 13 shown in FIG. To do. With reference to FIGS. 26 to 28, the thickness increasing process (corresponding to S13 in FIG. 6) and the necking process of the cage 33 will be described.

  In the process of this embodiment corresponding to S13, the cylindrical member 42 that is the base of the retainer 33 is set between the outer die 44 for necking and the inner die 46, and the thickening process and the collar portion at the boundary portion are performed. 19 is formed (necking) at the same time. Here, the flange portion 19 is formed through a two-step process including a pre-processing step of bending a predetermined angle with respect to the axial direction and a post-processing step of bending 90 ° with respect to the axial direction. And the thickening process of a boundary part is performed simultaneously with a post-processing process.

  First, referring to FIG. 26, the pretreatment step is a step of bending both axial end portions of the cylindrical member 42 to be the flange portion 19 inward with respect to the column end portion 17 by a predetermined angle (45 ° in this embodiment). A necking outer mold 44 (hereinafter simply referred to as “outer mold 44”), a necking inner mold 46 (hereinafter simply referred to as “inner mold 46”), and a pair of necking jigs 48 and 49. Done.

  The outer die 44 has the same configuration as the outer die 24 for expansion press, and restrains the outer diameter surface of the cylindrical member 42. However, the axial length is shorter than the outer die 24 for the expansion press, and the both axial ends of the cylindrical member 42 serving as the flange portion 19 are not restrained.

  Referring to FIG. 27, the inner mold 46 is constituted by, for example, first to eighth divided inner molds 46a, 46b, 46c, 46d, 46e, 46f, 46g, and 46h that are radially divided at an angle of 45 °. Is done. The first to eighth divided inner dies 46a to 46h are movable in the radial direction.

  Referring to FIG. 26, the inner mold 46 has a small-diameter portion 45a that matches the inner diameter of the column central portion 16 in the axial central region of the outer diameter surface, and an inner diameter of the column end 17 in the axial end region. The matching large-diameter portion 45b, the inclined portion 45c along the column inclined portion 18 between the small-diameter portion 45a and the large-diameter portion 45b, and the bending angle (45 °) of the flange portion 19 by pretreatment at the corners at both axial ends. ) Is a cylindrical member including a necking portion 45d that defines

  Specifically, when the first to eighth divided inner dies 46a to 46h are retracted radially inward, the first to eighth divided inner dies 46a to 46h can be put into and out of the cylindrical member 42. On the other hand, when the first to eighth divided inner dies 46a to 46h are advanced radially outward, the inner diameter surface of the cylindrical member 42 can be constrained (state shown in FIG. 26). The divided inner dies 46 a to 46 h can be advanced by inserting the insertion jig 47.

  The necking jig 48 has a necking portion 48 a along the inclination angle (45 °) of the flange portion 19 in the pretreatment process at the tip, and is movable in the axial direction of the cylindrical member 42. The necking jig 49 has the same configuration. When the pair of necking jigs 48 and 49 are retracted in the axial direction, the cylindrical member 42 can be taken in and out of the cylindrical space. On the other hand, when the pair of necking jigs 48 and 49 are advanced in the axial direction, both ends in the axial direction of the cylindrical member 42 (portions indicated by broken lines in FIG. 26) can be bent inward by a predetermined angle (45 °). .

  Next, referring to FIG. 28, in the post-processing step, the flange portion 19 is bent inward by 90 ° with respect to the column end portion 17. The processing jigs in the post-processing step are necking outer dies 54a to 54d (only 54a and 54c are shown) and necking inner dies 56a to 56h (only 56a and 56e are shown) having the same configuration as that used in the pre-processing step. The insertion jig 57 and a pair of necking jigs 58 and 59 are used. It should be noted that the outer mold 44 and the outer mold 54 may be the same mold, and may be shared by the pretreatment process and the posttreatment process. The same applies to the insertion jig 47 and the insertion jig 57.

  In the post-processing step, the inner and outer diameter surfaces of the cylindrical member 42 are restrained in the same procedure as in the pre-processing step, and the collar portion 19 is compressed from the axial direction by the necking jigs 58 and 59. Thereby, the angle | corner which the pillar edge part 17 and the collar part 19 make becomes 90 degrees. Further, in this step, the boundary portion can be increased in thickness similarly to the third step S13 shown in FIG.

By the way, the cage 33 of the present embodiment further includes a flange portion 19 extending radially inward from each of the pair of ring portions 14 and 14, and the thickness t ₁ of the pair of ring portions 14 and 14 and the flange portion 19 is: It is smaller than the wall thickness t ₂ of the boundary portion between the ring portion 14 and the flange portion 19. Thereby, the intensity | strength of a boundary part can be enlarged relatively and the durability performance of the holder | retainer 33 can be improved.

  In the above embodiment, an example in which the retainers 13 and 33 are manufactured using a flat steel plate as a starting material has been described. However, the present invention is not limited thereto, and a cylindrical member such as a pipe material may be manufactured as a starting material. it can. In this case, the first step S11 shown in FIG. 6 can be omitted.

  In the description so far, examples of cage roller type needle roller bearings 11 and 31 have been shown as embodiments of the present invention. However, the present invention further includes needle rollers further including at least one of an inner ring and an outer ring. It can also be applied to bearings. Moreover, although the example which employ | adopted the needle roller 12 as a rolling element was shown, not only this but a cylindrical roller and a rod-shaped roller may be sufficient.

  Furthermore, the needle roller bearings 11 and 31 according to the above-described embodiment are particularly used by using them as, for example, idler bearings for automobile transmissions, planetary gears for automobile transmissions, and connecting rod large end bearings for motorcycle engines. There is an advantageous effect.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is advantageously used for a roller bearing retainer and a needle roller bearing.

11, 31 Needle roller bearing, 12 needle roller, 12a pitch circle, 13, 33 cage, 14 ring part, 15 pillar part, 16 pillar center part, 17 pillar end part, 18 pillar inclined part, 16a first Roller stopper (burnishing claw), 17a Second roller stopper (caulking claw), 16b, 17b, 18b Wall surface, 16c Non-contact part, 16d Oil groove, 19 collar part, 20 pocket, 21 Cup-shaped member, 21a Bottom Wall, 21b Outward flange part, 21c Inward flange part, 22, 42 Cylindrical member, 24, 44 Outer mold, 23a Cylindrical space, 23b, 25a, 26a, 45a Small diameter part, 23c, 25b, 26b, 45b Large diameter part , 23d, 25c, 26c, 45c Inclined part, 24a, 24b, 24c, 24d, 44a, 44b, 44c, 44d, 54a, 54c Divided outer mold, 25, 26, 46 Inner mold, 46a 46b, 46c, 46d, 46e, 46f, 46g, 46h, 56a, 56e Split inner mold, 27 Moving jig, 28, 29 Compression jig, 47, 57 Inserting jig, 48, 49, 58, 59 Necking treatment Tool, 45d, 48a, 49a necking part, 60 jig, 61 processing table, 61g
Guide groove, 62 burnishing jig, 63 caulking jig, 65 processing table.

In view of the above-described circumstances, the present invention provides a press roller bearing retainer that can be manufactured with simpler processing equipment and a smaller number of processing steps.

Press Ltd. roller bearing cage according to the invention for this purpose is provided with a pair of ring portions of the annular shape, and a plurality of pillar portions interconnecting the pair of ring portions, between the adjacent pillar portions A roller bearing retainer in which a pocket for accommodating a roller is formed, wherein the column portion is relatively relative to the column central portion positioned relatively radially inward in the axial central region and in the axial end region. One side in the radial direction is formed by pressing so as to include a pair of column end portions positioned radially outside and a pair of column inclined portions positioned between the column center portion and each of the pair of column end portions. The first roller stopper that protrudes from the wall of the central part of the column that faces the pocket only by machining from the roller and prevents the roller from falling off radially inward, and faces the pocket only by machining from one side in the radial direction Protruding from the wall surface of the pair of column ends Made is and a second roller stopper portion for preventing the detachment of the radially outer rollers, the first roller stopper portion and the second roller stoppers have different shapes.

Further, in the present invention, a column central portion that is relatively radially inward in the axial central region, a pair of column end portions that are relatively radially outward in the axial end region, and a column central And a pair of column inclined portions located between each of the column end portions and the pair of column end portions, the first roller stop portion being provided at the center portion of the column and the second roller stop portion being provided at each of the pair of column end portions. ing. This makes it possible to reduce the weight while increasing the strength of the cage.

More preferably, the thickness of each part of the column center part, the pair of column end parts, and the pair of column inclined parts is smaller than the thickness of the boundary part between adjacent parts. As a result, the thickness of the boundary portion can be made thicker than other portions, and the durability against stress concentration can be improved. Therefore, it is possible to obtain a high strength press roller bearing cage.

More preferably, a rib portion extending radially inward from each of the pair of ring portions is further provided, and the thickness of the pair of ring portions and the flange portion is smaller than the thickness of the boundary portion between the ring portion and the flange portion. Thereby, it becomes possible to make the thickness of a boundary part thicker than another part, and to obtain a high strength press roller bearing retainer.

Moreover, the roller bearing by this invention is equipped with the cage for press roller bearings of this invention, and the some roller accommodated in a pocket. According to the present invention, a roller bearing that can be manufactured with a smaller number of processing steps can be obtained.

According to the method for manufacturing a press roller bearing retainer according to the present invention, a pair of ring-shaped ring portions, a plurality of column portions interconnecting the pair of ring portions, and an adjacent column portion For roller bearings comprising pockets for accommodating rollers, and first and second roller stoppers that are unevenly distributed on the radially inner side and the radially outer side on the wall surfaces of the pillars facing the pockets to prevent the rollers from falling off A method for manufacturing a cage, wherein a cylindrical member as a starting material is pressed to position a central region in the axial direction of the cylindrical member relatively radially inward, and an axial end region of the cylindrical member. Is positioned relatively radially outside, and a pressing process for inclining a connecting region between the axial central region and the axial end region with respect to the radial direction, a pair of ring portions on the cylindrical member, and a plurality of columns Crafts to form parts and pockets If, by processing only the pillar portion from a radial one side, the first roller stopper portion, and forming the wall surface of the column center portion facing the pocket, the processing for forming a stop portion first roller is by processing only the pillar portion from a radial one side by different processing comprises a second roller stoppers, and forming the wall surface of the pair of column ends facing the pocket.

According to this invention, the column portion is processed only from one radial side to form the first roller stopper, and the column portion is processed only from the radial one side to form the second roller stopper. The first and second roller stoppers can be formed by processing from only one side, and a roller bearing that can be manufactured with fewer processing steps than conventional can be obtained. .

Preferably, the step of forming the first roller stopper and the step of forming the second roller stopper are performed simultaneously. As a result, the time required for processing can be shortened, and a press roller bearing retainer that is advantageous in cost can be manufactured in a short time.

As described above, in the press roller bearing retainer of the present invention, the first roller stopper portion unevenly distributed on the radially inner side and the second roller stopper portion unevenly distributed on the radially outer side are processed only from one side in the radial direction. Since it is formed, it becomes possible to simplify the processing equipment of the roller stopper part as compared with the prior art. Moreover, it becomes possible to manufacture a press roller bearing retainer with fewer processing steps than in the past. Therefore, it is possible to provide a roller bearing that is advantageous in terms of cost.

Claims (10)

A roller bearing retainer comprising a pair of ring-shaped ring portions and a plurality of column portions connecting the pair of ring portions to each other, and pockets for accommodating rollers are formed between the adjacent column portions. A vessel,
The columnar portion is radially distributed on the wall surface facing the pocket, radially inward to prevent the rollers from falling off radially inward, and is radially distributed radially outwardly of the roller. A second roller stopper for preventing the outer part from falling off,
Each of the first and second roller stoppers is a roller bearing retainer formed only by processing from one side in the radial direction.   2. The roller bearing retainer according to claim 1, wherein the first and second roller stoppers are formed only by processing from a radially outer side of the roller bearing retainer.   The said 1st roller stop part is a burnishing nail | claw formed by squeezing the wall surface facing the said pocket of the said pillar part by the processing jig inserted in the said pocket from the radial direction outer side. The cage for roller bearings described.   The roller bearing retainer according to claim 2 or 3, wherein the second roller stopper is a caulking claw that is formed by caulking the outer diameter surface of the column portion with a processing jig. The column portion includes a column center portion that is positioned relatively radially inward in the axial center region, a pair of column end portions that are positioned relatively radially outward in the axial end region, and the column center. And a pair of column inclined portions located between the pair of column end portions,
The roller bearing holder according to any one of claims 1 to 4, wherein the first roller stopper is provided at the center of the column and the second roller stopper is provided at each of the pair of column ends. vessel.   6. The roller bearing retainer according to claim 5, wherein a thickness of each portion of the column central portion, the pair of column end portions, and the pair of column inclined portions is smaller than a thickness of a boundary portion between adjacent portions. The roller bearing retainer further includes a flange portion extending radially inward from each of the pair of ring portions,
The roller bearing retainer according to any one of claims 1 to 6, wherein a thickness of the pair of ring portions and the flange portion is smaller than a thickness of a boundary portion between the ring portion and the flange portion. A roller bearing retainer according to any one of claims 1 to 7,
A roller bearing comprising a plurality of rollers accommodated in the pocket. A pair of ring-shaped ring portions, a plurality of column portions that connect the pair of ring portions to each other, a pocket that accommodates rollers between the adjacent column portions, and the pocket of the column portion. A method of manufacturing a roller bearing retainer including first and second roller stoppers that are unevenly distributed on a wall surface on each of a radially inner side and a radially outer side to prevent the rollers from falling off.
Forming the pair of ring portions, the plurality of column portions, and the pockets in a cylindrical member as a starting material;
Processing the cylindrical member only from one side in the radial direction to form the first roller stopper,
And a step of forming the second roller stopper by processing the cylindrical member only from one side in the radial direction.   The method for manufacturing a roller bearing retainer according to claim 9, wherein the step of forming the first roller stopper and the step of forming the second roller stopper are performed simultaneously.

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