JP2010025230A - Pressed cage, self-aligning roller bearing, and manufacturing method for pressed cage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and highly accurately form a flange and a roller guide face on a pressed cage for a self-aligning roller bearing. <P>SOLUTION: A pressed cage is formed with a plurality of columns 3, 3 spanning an annular part 1 on the large-diameter side and an annular part 2 on the small-diameter side, a plurality of pockets 4, 4 respectively circumferentially separated by each column 3, each roller guide face 1a slidably brought into contact with the end face of each revolving convex-face roller 5, and a flange 6 formed by raising the annular part 1 on the large-diameter side in the diameter direction. The roller guide face 1a is composed of a punched cross-section, formed on the annular part 1 on the large-diameter side, in the inner periphery of the pocket 4. Each flange bent part r of the flange 6 is formed in the annular part 1 on the large-diameter side over the entire circumferential periphery. By this, the roller guide faces 1a can be obtained only by required punching, thereby allowing to easily obtain the uniform flatness or the uniform bending angle of both faces of the front face and the rear face of the flange 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a punching cage in which a flange and a pocket are formed by press working, a self-aligning roller bearing using the punching cage, and a manufacturing method of the punching cage.

  The self-aligning roller bearing is a double row roller bearing having a spherical raceway on the outer ring, and convex rollers are used as rolling elements in each row. It is necessary to suppress the skew behavior of the revolving convex roller, and roller guide means using a guide wheel, a center rod, a cage or the like as appropriate is provided. 2. Description of the Related Art Conventionally, as roller guide means using a cage, a roller guide surface capable of sliding contact with an end surface of a revolving convex roller is formed on a punched cage (Patent Document 1).

  As shown in FIG. 11, the punching cage disclosed in Patent Document 1 includes a plurality of columns 103, 103, and columns 103 extending between the large-diameter side ring portion 101 and the small-diameter side ring portion 102. .. Are formed in a circumferential direction and a flange 105 is formed by raising the large-diameter side ring portion 101 in the diameter direction.

  The punching cage shown in FIG. 11 can be handled collectively in a state where a row of rollers is held by the punching cage for the convenience of bearing assembly. Specifically, when the pillars 103 positioned on both sides in the circumferential direction come into contact with the outer peripheral portion of the convex roller 106 from the inside or the outside, the escape of the convex roller 106 to the inside or outside is restricted. In order to obtain such a restriction, each column 103 deviates in one of the inner and outer sides from the region where the circumferential interval between the convex rollers 106 and 106 adjacent in the circumferential direction is the smallest, that is, the pitch circle including the rotation axis of the convex roller 106. Provided in position. For this reason, there is also an advantage that the number of rollers and the roller diameter can be increased. The flange 105 is raised on the other side inside and outside. The flange 105 is formed with a stopper 105 a that is hooked on a concave portion 106 a formed at the center of the end surface of the convex roller 106. When the convex roller 106 is put into the pocket 104 while pressing the convex roller 106 to elastically deform the flange 105 or the retaining member 105a, the retaining member 105a enters the concave portion 106a of the convex roller 106 due to elastic recovery. The escape to the other inside and outside is restricted by being caught by the inner surface of the recess 106a.

  In addition, roller guide surfaces 105b and 105b are formed on the flange 105. The roller guide surfaces 105b and 105b can be slidably contacted with a grinding portion 106b that connects the chamfered portion to the concave portion 106a on the end surface of the convex roller 106. The roller guide surfaces 105b and 105b are formed of a surface portion facing the grinding portion 106b of the convex roller 106 that revolves between the tracks of the inner and outer rings 111 and 112. When the roller guide surfaces 105b and 105b are formed on the cage, the separation of the end surface of the convex roller 106 from the guide surfaces 105b and 105b can be avoided in any row regardless of the state of the axial load received by the self-aligning roller bearing. Therefore, the roller skew behavior can be stably prevented.

  Conventionally, in the manufacture of a punching cage, as shown in FIG. 12 (a), after forming the annular body 120 having a large diameter at one end of the peripheral wall 121 and a small diameter at the other end using a metal plate. As shown in FIG. 12 (b), a punching process is performed in which a hole 122 for pocket is formed in a portion between both ends of the peripheral wall 121. After the punching process, as shown in FIG. 12C, a flange process is performed in which the entire one end 124 of the annular body is raised in the diametrical direction. The flange bent portion is set in the middle of the connecting portion 125 serving as a column. At one end portion 124 of the annular body, a stopper and a roller guide surface are appropriately formed.

  For example, when forming a retaining member as shown in FIG. 11, it is punched so that a bent piece 123 is formed on the inner periphery of the pocket hole 122 as shown in FIG. After performing the flange processing, the bent piece formed by punching is bent to the front side (that is, the side facing the pocket).

  In addition, as disclosed in Patent Document 2, it is also practiced to form a stopper that is caught in the concave portion of the end surface of the convex roller by protruding the flange to the front side.

JP 2000-2247 A Japanese Patent Laid-Open No. 2-180314

  However, the punching cage as shown in FIG. 11 has a structure in which the flange bending portion of the flange 105 exists on each column 103. That is, in the manufacture of the punching cage, each connecting portion extending between both end portions of the peripheral wall is formed by punching, and each connecting portion is finally a portion that becomes each column. When the flange bending portion exists at the above position, one end of the peripheral wall is raised from the intermediate portion of each connecting portion in the flange processing. Since it is difficult to make each joint part have the same internal stress or to apply a uniform bending force to each joint part, the bending condition is not uniform in each joint part. One end of the peripheral wall is the part that eventually becomes the flange 105, but the flatness of both plate surfaces is uniformly formed over the entire circumference in the circumferential direction due to the variation in bending condition at each connecting part, or the bending angle It is difficult to make it uniform over the entire circumference. This makes it difficult to form a structure portion that requires accuracy using the flange in the circumferential direction or at uniform intervals in the circumferential direction. In the example of FIG. 11, in order to form the roller guide surfaces 105b and 105b that require accuracy on the flange 105, accuracy must be ensured by performing extrusion molding on one end portion of the peripheral wall after performing flange processing.

  In view of the above circumstances, an object of the present invention is to easily and accurately form a flange and a roller guide surface in a punching cage for a self-aligning roller bearing.

  In order to achieve the above object, the present invention provides a plurality of columns extending between the large-diameter side ring portion and the small-diameter side ring portion, a plurality of pockets separated in the circumferential direction by the columns, and a convex roller that revolves. In the punching cage in which a roller guide surface slidable in contact with the end surface of the roller and a flange in which the large-diameter side ring portion is raised in the diametrical direction are formed, the roller guide surface is the inner periphery of the pocket. It consists of a punched section formed in the large-diameter side ring portion, and the flange bending portion of the flange is formed over the entire circumference in the circumferential direction on the large-diameter side ring portion. Here, the circumferential direction means a direction along the circumferential direction around the cage central axis.

According to the configuration of the present invention, the punched cross section formed by the punching process is composed of a sheared surface and a fractured surface, and the sheared surface is a cross section cut by the punch, so that the accuracy is excellent. If the punching section of the large-diameter side ring over the entire circumference is a part of the inner circumference of the pocket, the punching section of the large-diameter ring is opposed to the end face of the convex roller, can do. As mentioned above, because the cross section with excellent accuracy can be obtained by punching, the roller guide surface consisting of the punched cross section of the large-diameter side ring has sufficient accuracy, and can only be punched. .
In addition, as described above, the inner periphery of the pocket has a structure including a punched section of the large-diameter side ring portion, so that a bent portion of the flange is ensured over the entire circumference in the portion that becomes the large-diameter side ring portion. As a result, it becomes easy to obtain the flatness and bending angle of both the front and back surfaces of the flange uniformly over the entire circumference.
As described above, according to the present invention, the roller guide surface can be obtained only by the essential punching process, and accordingly, the flatness and the bending angle of the front and back surfaces of the flange can be easily obtained uniformly over the entire circumference. Therefore, the flange and the roller guide surface can be easily and accurately formed on the punching cage for the self-aligning roller bearing.

Embodiments according to the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, the self-aligning roller bearing according to the embodiment is configured such that the punching cages 10, 10 are incorporated between the inner and outer race rings 11, 12 in a facing pair. The punching cage 10 includes a plurality of pillars 3, 3... And a plurality of pillars 3, 3... That are separated in the circumferential direction between the large diameter ring 1 and the small diameter ring 2. Pockets 4, 4..., A roller guide surface 1 a that can be slidably contacted with the end surface of the revolving convex roller 5, and a flange 6 that raises the large-diameter-side ring portion 1 in the diametrical direction.

  The large-diameter-side ring portion 1 and the small-diameter-side ring portion 2 are width portions over the entire circumference in the circumferential direction of the punching cage 10.

  A flange bending portion r of the flange 6 is formed in the large-diameter side ring portion 1 over the entire circumference in the circumferential direction.

  The inner periphery of the pocket 4 includes a punching section of the large-diameter side ring portion 1, a punching section of the small-diameter side ring portion 2, and circumferential end portions of both the pillars 3 and 3. The convex roller 5 that revolves is held in a predetermined range in the circumferential interval and the axial position on the inner periphery of the pocket 4. Here, the axial direction is a direction along the cage central axis. Hereinafter, when the concepts regarding the radial direction and the axial direction are used without notice, they relate to the cage central axis.

  In addition, the circumferential direction edge part of both the pillars 3 and 3 has a shape which receives the rolling surface of the convex roller 5. FIG. This is to make the punching cage 10 into a rolling element guide system, and the circumferential end of the column 3 located on the roller revolution direction side receives the rolling surface of the convex roller 5, thereby the punching cage. 10 is guided in the radial direction. In addition, as long as it is a normal driving | running condition, the convex roller 5 to roll does not run on each pillar 3. FIG. In this punching cage 10, the circumference of the pitch diameter including the roller rotation axis C in a state where the convex rollers 5 are interposed between the inner and outer race rings 11 and 12 (hereinafter, this circumference is simply referred to as PCD). It is located inside. Compared with the case where it is located outside, the radial component force received by the punching cage 10 by the contact between the rolling surface of each rolling roller 5 that rolls and the circumferential end of each column 3 is increased. This is because the punching cage 10 is easily guided in the radial direction. For other purposes, for example, when priority is given to the strength of each column 3, the circumferential width of the column 3 while keeping the same number of rollers and the like by positioning each column 3 outward and on a larger circumference Can be increased. The punching cage 10 can also be a bearing ring guide system using the tip edge of the flange 6 or the tip edge of the small flange where the small diameter side ring portion 2 is raised.

  The roller guide surface 1 a has a punched cross section formed in the large-diameter side ring portion 1 in the inner periphery of the pocket 4. The roller guide surface 1 a is formed in a direction facing the end surface of the revolving convex roller 5. When the revolving convex roller 5 causes skew behavior, the skew behavior can be suppressed by sliding contact with the roller guide surface 1a.

  In particular, the entire end surface of the convex roller 5 except the chamfered portion is a ground surface, and the roller guide surface 1a has a circumferential length that can ensure a sliding contact range over the entire diameter of the ground surface during revolution. have.

  Since a contact area symmetrical in the circumferential direction is secured with the rotation axis c of the convex roller 5 as a boundary, the rolling of the convex roller 5 is unlikely to become unstable. In terms of preventing skewing of the convex rollers 5, it is better to ensure a long slidable range.

  In order to receive the skew behavior with the punching cage 10, it is preferable to provide a means for suppressing the skew rotation of the punching cage 10 to stabilize the cage rotation. In order to incorporate the punch holders 10 and 10 having the same shape as a pair, the rotation of the skew is caused by bringing the rear surface of the flange 6 of the punch holder 10 subjected to the skew behavior into contact with the rear surface of the flange 6 of another punch holder 10. Can be suppressed. Since this contact occurs while the cage is rotating, it comes into sliding contact with the back surface of the other flange 6.

  Therefore, on the back surface of the flange 6, flat portions 6 a and 6 b that can slide in contact with the back surface of the flange 6 of another isomorphous punching cage 10 are formed so as to extend over the entire circumference.

  When the skew rotation of the cage 10 during roller guidance is suppressed by sliding contact between the back surfaces of the flanges 6 and 6, in order to obtain a stable cage and roller behavior, the areas of the plane portions 6a and 6b are increased, It is effective to secure the portions 6a and 6b with a large width over the entire circumference and to increase the flatness of the flat portions 6a and 6b.

  As described above, according to the present invention, the flatness of the back surface of the flange 6 can be easily obtained uniformly over the entire circumference. For this reason, it is possible to easily form the flat portion 6a over the entire circumference in the circumferential direction only by the flange processing, or it is easy to form with high accuracy even if the surface pressing is separately performed. Further, the flat portions 6b arranged at a uniform interval in the circumferential direction can be easily aligned with each other.

  The plane portion 6a is oriented along the radial plane because of the sliding contact during operation, but the inclination in consideration of the alignment angle is given from the entire width of the flange 6 or from the middle of the width toward the front end side of the flange 6. You can also. For example, you may give an inclination only to the plane part 6b.

  Further, when the pillar 3 comes into contact with the outer peripheral portion of the convex roller 5 from the inside or the outside, the protrusion of the convex roller 5 to the inside or outside is restricted, and the flange 6 raised on the other side of the inside or outside is controlled. Among the plurality of pockets 4, 4... In the circumferential direction, a stopper 6 c is formed on the outer peripheral portion of the convex roller 5 that overlaps with the gap g from the inside and outside. Here, the outer peripheral portion of the convex roller 5 is composed of a rolling surface and a chamfered portion.

  Each column 3 is located at a position deviated from the PCD inward or outward with the convex roller 5 interposed between the inner and outer races 11 and 12. When the pillars 3 and 3 positioned on both sides in the circumferential direction of the pocket 4 come into contact with the outer peripheral portion of the convex roller 5 from the inside or outside, the slippage of the convex roller 5 to the inside or outside is restricted. In this way, the position of each pillar 3 in the space between the inner and outer races 11 and 12 is brought closer to the inner and outer races 11 and the width of the flange 6 is easily secured. It becomes easy.

  If the stopper 6c is formed on the outer peripheral portion of the convex roller 5 so as to overlap with the gap g from the inside and outside, it is possible to restrict the roller slipping out of the punching cage without relying on the concave portion on the end surface of the convex roller 5. For this reason, it is not necessary to form a recessed part in the end surface of the convex roller 5, and the cost of the convex roller 5 is reduced, and the range which can be slidably contacted with the roller guide surface 1a is ensured more widely in the end surface of the convex roller 5. be able to. Since there is a gap g, the retainer 6 c does not contact the outer peripheral portion of the convex roller 5 during normal operation.

  Since both the stoppers 6c and 6c in the positional relationship corresponding to both the pillars 3 and 3 are provided at positions outside the inner and outer sides of the convex roller 5 so as to overlap the outer peripheral portion of the convex roller 5 from the inner and outer sides, It can be formed to fit in a space between the five. For this reason, each retaining member 6c does not affect the number of rollers.

  In addition, in order to prevent the convex roller 5 from slipping out to the other inside or outside, instead of being formed on the flange 6, a large-diameter side ring that forms a concave portion on the end surface of the convex roller 5 and forms the inner periphery of the pocket 4. It is also possible to appropriately form a stopper in the portion 1, the small diameter side ring portion 2, and the like. When a deep concave portion cannot be formed on the end surface of the convex roller 5 due to the rigidity required for the convex roller 5, the stopper is made small because it enters a shallow concave portion. Under conditions where misalignment may occur, such as a self-aligning roller bearing, contact with the retaining position may occur. The small stopper prevents the regulation from becoming effective due to wear, and there is a risk that the roller will fall out when the cage is pulled out during an overhaul of the bearing. If the retainer 6c is formed so as to overlap the outer peripheral portion of the convex roller 5 with a gap g from the other inside and outside, there is also an advantage that the retainer 6c can be formed large without limitation by the depth of the recess.

  The retainer 6 c is formed of a bulging portion that is bulged to the front side by extrusion molding applied to a portion of the flange 6 positioned between the pockets 4, and the convex roller 5 is formed in the pocket 4 while causing the flange 6 to be elastically deformed. When pushed in, both the stoppers 6c, 6c located on both sides in the circumferential direction of the convex roller 5 are overlapped with the outer peripheral portion of the convex roller 5 from the inner and outer sides by elastic recovery.

  Since the flange 6 is bulged to form the retaining member 6c, the retaining member 6c does not have a free end cut off from the flange 6, and the sectional area of the continuous portion between the retaining member 6c and the flange 6 is a bent piece. More than stop. For this reason, the retaining member 6c is less likely to be deformed with respect to the flange 6 than the bent piece. Therefore, even if the outer peripheral portion of the convex roller 5 contacts the retaining member 6c under an abnormal condition in which the convex roller 5 rides on the pillar 3, the retaining member 6c is hardly damaged. This is advantageous for stabilizing the behavior of the convex roller riding on the pillar 3 to a proper position by contact with the retaining member 6c and for facilitating the protection of the retaining member 6c when handling the punching retainer 10. is there.

  Moreover, since the retaining members 6c are formed by extrusion using a die, each retaining member 6c can be formed with high accuracy.

  Further, since the stopper 6c is formed by extruding the flange 6, the stopper 6c does not have a punching section, and the outer peripheral portion of the convex roller 5 is in surface contact with the surface of the bulging portion under the above-described abnormal conditions. To do. Therefore, the oil film on the outer peripheral portion of the convex roller 5 is not scraped off, and the outer peripheral portion of the convex roller 5 is not damaged by a rough punched section, and the outer peripheral portion of the convex roller 5 is hardly damaged.

  If the elastic deformation on the punching cage 10 side is utilized, there is no need for the trouble of forming the stopper by plastic bending of the bent piece with the convex roller 5 received on the inner periphery of the pocket 4.

  In the example of the punching cage 10, as shown in FIG. 4A, the outer peripheral portion of the convex roller 5 is pressed against the stoppers 6 c to 6, so that the flanges 6 to 6 as shown in FIG. When elastic deformation is caused in the column 3, the convex roller 5 can be pushed into the pocket 4. When elastic recovery occurs as shown in FIG. 4 (c), as shown in FIG. 2, both the retaining members 6c and 6c in the positional relationship corresponding to the both pillars 3 and 3 are separated from the outer peripheral portion of the convex roller 5 and the gap. Overlap from inside and outside with g.

  As shown in FIG. 5, the edge of the flange 6 is shaped along the circumference. Here, the circumference means the circumference around the cage center axis.

  As described above, the stopper 6c is formed by extruding the flange 6 so that there is no cut-out portion for forming the stopper at one end portion of the peripheral wall that becomes the large-diameter side ring portion 1. Can be used for the purpose. If this is utilized and the front-end edge of the flange 6 is made into a shape along the circumference, the machining shape becomes simple. Since the punching cage 10 can perform punching with a simple shape, it is advantageous in terms of the processing, accuracy improvement in punching die manufacture, and die life.

  Moreover, since the front-end edge of the flange 6 follows the circumference, there is no cut-off portion between the retaining members 6c, 6c adjacent in the circumferential direction. If this is utilized, the plane part 6b can be added between the hollows 6d and 6d accompanying formation of the retaining member 6c. For this reason, the range which can be slidably contacted can be expanded in the radial direction as compared with the case where only the flat portion 6a extending over the entire circumference in the circumferential direction is formed on the inner and outer sides than the retaining 6c.

  In addition, the plane part 6b can be expanded to the same diameter as the front-end edge of the flange 6 at maximum. The front end edge of the flange 6 can be expanded to the limit that it can be inserted into the other inner and outer races 12. The flat surface portion 6b is formed equally in the circumferential direction from the arrangement of the retaining member 6c and does not deviate the center of gravity of the cage.

  Moreover, as shown in FIG. 2, the retaining member 6c is provided in an effective symmetrical shape with respect to both convex rollers 5 and 5 adjacent in the circumferential direction.

  If each retaining member 6c is provided in a portion of the flange 6 positioned between the pockets 4 in the circumferential direction, the retaining member 6c can be effectively symmetrical with respect to the both convex rollers 5 and 5 as described above. The number of molding can be reduced. Since the retaining 6c can be accurately formed with a die as described above, the same retaining effect can be easily obtained for the both convex rollers 5 and 5 in the embodiment.

  As shown in FIGS. 2 to 4 (a) and 4 (b), the retainer 6c swells most in the axial direction at the tip edge of the flange 6, and so as to swell slightly in the axial direction as it advances toward one of the inner and outer sides. Is formed.

  When the tip edge of the flange 6 swells in the most axial direction, the retainer 6c can be overlapped with the outer peripheral portion of the convex roller 5 with a gap g by making the most effective use of the flange width.

  Further, in extrusion molding, it is natural that the retaining 6c is curved. Based on this, the retaining member 6c is formed so as to swell small in the axial direction as it advances toward the inner or outer side. The retaining 6 c is provided with a relief shape with respect to the outer peripheral portion of the convex roller 5 from the front end edge of the flange 6 toward the inner and outer sides. As a result, as shown in FIG. 4, the flange 6 and the like can be elastically deformed while pressing the outer peripheral portion of the convex roller 5 against the relief shape portion of the retaining 6c, and the flange 6 and the like necessary for roller insertion can be produced. The amount of deformation can be reduced.

  Since the tip edge of the flange 6 is the portion most easily deformed by extrusion, if the bulge in the axial direction of the retainer 6c is maximized there, it can be formed with a relatively small processing force.

  Further, the retainer 6c is formed so that the circumferential width is the largest at the front end edge of the flange 6 and the circumferential width decreases as the inner side and the outer side proceed.

  When the bulge in the axial direction of the retainer 6c is maximized at the tip edge of the flange 6, the rigidity of the retainer 6c is required. If the circumferential width of the retainer 6c is maximized at the leading edge of the flange 6, the rigidity of the retainer 6c can be effectively increased. Further, since the retaining width 6c decreases in the circumferential width as it advances toward the inner and outer one side, a relief shape is provided in the circumferential direction in consideration of roller insertion.

  It should be noted that the retaining 6c can be appropriately determined as long as desired retaining regulation and a desired effect are obtained. For example, in the embodiment, in order to give the escape shape as described above to the retaining member 6c, the retaining member 6c is configured based on the conical column with the apex directed toward the cage center, but is configured based on a spherical surface. You can also.

  Further, the retaining 6c is provided with a bulge that can be applied only to the chamfered portion of the outer peripheral portion of the convex roller 5 in order to facilitate extrusion. This is preferable in order to protect the rolling surface of the convex roller 5 when the convex roller 5 rides on the column 3, but can be applied to the rolling surface of the convex roller 5 when priority is given to reliable retaining prevention. It can also give a bulge.

  As shown in FIGS. 1 and 5, a recess 6d formed on the back surface of the flange 6 as the retaining member 6c is pushed out continues to the flat portions 6a and 6b.

  A lubricant enters the recess 6d. For this reason, if the recess 6d is continuous with the flat portions 6a and 6b, the lubricant in the recess 6d is naturally supplied to the flat portions 6a and 6b. Therefore, when the opposed pair of punching cages 10 and 10 are in sliding contact with each other between the flat portions 6a and 6b, the lubrication of the flat portions 6a and 6b is improved.

  The lubricant may be either lubricating oil or grease.

  Further, the recess 6 d extends to the leading edge of the flange 6.

  When the recess 6d reaches the leading edge of the flange 6, even when the pair of opposing punching cages 10 and 10 are in sliding contact with each other between the flat portions 6a and 6b, the opening formed by the recess 6d between the flanges 6 and 6 is provided. Occurs. Therefore, the lubricant inside the bearing is likely to enter the recess 6d, and as a result, it becomes easier to obtain the lubrication of the flat portions 6a and 6b.

  In the punching cage 10, the stopper 6 c is formed so as to swell most in the axial direction at the tip edge of the flange 6 and to have the largest circumferential width, so that the opening of the recess 6 d can be made the largest. In particular, the lubricant inside the bearing can easily enter the recess 6d.

  A method for manufacturing the punching cage 10 will be described. First, as shown in FIGS. 6A and 6B, a forming process is performed in which the annular body 20 having one end of the peripheral wall 21 having a large diameter and the other end having a small diameter is formed of a metal plate. For example, the annular body 20 can be formed by forming a cup body by deep drawing with respect to a disk and performing a bottoming process by punching out the central portion 22b excluding the peripheral edge portion 22a of the bottom portion 22. By the bottom drilling process, a portion serving as a small flange constituting the small diameter ring portion is provided in the annular body 20. The bottom drilling can be performed simultaneously with the deep drawing.

  Next, as shown in FIG.6 (c), the flange process which raises the one end part 21a of the surrounding wall 21 to a diameter direction outer side is performed.

  The flange bending part r can be formed on the same circumference over the entire circumference in the circumferential direction. Thereby, the flatness and bending angle of both plate surfaces of the raised end 21a of the peripheral wall 21 can be easily obtained uniformly over the entire circumference in the circumferential direction. For this reason, the surface part used as the said plane part can be formed in the one end part 21a of the surrounding wall 21 in the stage of a flange process.

  Unlike the above-described conventional example, since it is not necessary to form a bent piece for forming a stopper, it is possible to perform a flange process before a punching process for punching a pocket.

  Next, as shown in FIG. 6D, a punching process is performed in which a hole for forming a pocket is formed in a portion 21b between both ends of the peripheral wall 21.

  By the punching process, the one end side ring portion 21c which becomes a part of the large diameter side ring portion, the other end side ring portion 21d which becomes a part of the small diameter side ring portion, the connecting portion 21e which is a column portion, and the pocket A forming hole 23 is formed.

  At this time, the punching process is performed on a part of the peripheral wall 21 that is away from the flange bending part r formed by the flange process to the other end side.

  By providing a distance from the flange bend r to the other end, punching can be performed even if the one end 21a of the peripheral wall 21 exists. As long as the flatness and bending angle of the one end portion 21a of the peripheral wall 21 are not changed by punching, the distance can be set appropriately. Since there is no need to form a bent piece for forming a retaining member and there is no cut-off portion in the one end side ring portion 21c, the width of the one end side ring portion 21c is formed to the same flange width over the entire circumference in the circumferential direction. It can be used effectively.

  At this time, as shown in FIG. 7, punching is performed so that the punching section of the one-end-side ring portion 21 c has a section facing the end surface of the convex roller 5 held in the pocket 4. Thereby, the roller guide surface 1a can be formed only by punching.

  In the conventional example in which flange processing is performed after punching, when the width of the one-end-side ring portion 21c is narrow, the distance between the roller guide surface 1a and the flange bending portion r is reduced, and the direction of the formed roller guide surface 1a is There is a fear of going crazy. Since the flange process is performed before the punching process, the accuracy of the formed roller guide surface 1a does not go wrong even if the distance is set close. This is also advantageous when the retaining is formed on the flange after the flange processing. When the stopper is formed on the flange, it is preferable to make the distance from the inner periphery of the pocket closer in order to shorten the length of the flange that extends to the front side of the flange. This is because the distance between the roller guide surface 1a and the flange bending portion r is reduced.

  Next, as shown in FIG.6 (e), it extrudes from the one end side toward the other end with respect to the one end part 21a of the surrounding wall 21. As shown in FIG.

  After the punching process, the stopper 6c and the recess 6d are formed by extrusion, and the flange 6 is completed. The accuracy of the flat portions 6a and 6b can be ensured using this extrusion molding.

  When surface pressing is performed on the connecting portion 21e, the pillar 3 and the pocket 4 are formed.

  As described above, since this punching retainer 10 has a structure in which the inner periphery of the pocket 4 includes the punching section of the large-diameter side ring portion 1, the roller guide surface 1a can be obtained only by essential punching. Along with this, the bent portion r of the flange 6 can be secured over the entire circumference in the circumferential wall 21 portion that becomes the large-diameter side ring portion 1, so that the end portion 21 a of the circumferential wall 21 that becomes the flange 6 The flatness and bending angle of both plate surfaces, and thus the flatness and bending angle of both front and back surfaces of the flange 6 are easily obtained uniformly over the entire circumference. Therefore, this punching cage 10 can easily and accurately form the flange 6 and the roller guide surface 1a.

  A method of using the punching cage 10 will be described. As shown in FIG. 8, the punching cage 10 is for a self-aligning roller bearing, and therefore, the stopper 6 c is designed on the assumption of the returning operation. That is, it is possible to overlap the punching cages 10 on the raceway surface of the inner and outer races 11 and perform the assembly return operation. At this time, the stoppers 6c and 6c on both sides in the circumferential direction of the pocket 4 are hooked on the outer peripheral portion of the convex roller 5, and restrict the slip of the convex roller 5 to the other inside and outside. As shown in this example, when the punching cage 10, the convex roller 5, and the inner race ring 11 are assembled in the outer race ring 12 in the assembled state, if the column 3 is located outside the PCD, The inner race 11 is obstructive and it is difficult to incorporate the convex roller 5. For the purpose of avoiding this, the column 3 is positioned away from the inside of the PCD.

  When the return operation is performed as described above, as shown in FIG. 1, a self-aligning roller bearing in which the punching cages 10 and 10 are incorporated in opposed pairs between the inner and outer race rings 11 and 12 can be assembled.

  In the self-aligning roller bearing according to the embodiment, guide wheels are not incorporated between the inner and outer race rings 11 and 12.

  Since the skew behavior of the punching cages 10 and 10 can be suppressed only by the flat portions 6a and 6b that are in sliding contact with each other as a pair, the guide wheels and the intermediate hooks can be omitted. Thereby, the number of members of a self-aligning roller bearing can be reduced and cost reduction can be achieved.

  An oil hole 12a for supplying a lubricant toward the recess 6d is provided in the inner and outer race rings 12.

  In the self-aligning roller bearing according to the embodiment, a recess 6d accompanying the bulging of the retaining member 6c extends to the front edge of the flange 6 on the back surface of the flange 6 and is continuous with the flat portions 6a and 6b. Since there is no ring, when the lubricant is supplied from the oil hole 12a, the lubricant is likely to enter the recess 6d and the lubricant is easily supplied to the flat portions 6a and 6b.

  The present invention is not limited to the embodiments, and various modifications can be made as long as the object of the present invention can be achieved. Moreover, the structure for achieving the application purpose mentioned above can be combined suitably, or can be employ | adopted independently.

  For example, when assembling the outer race ring, punching cage, and rollers, the column may be positioned outward from the PCD and the flange may be bent inward.

  The retaining that restricts the protrusion of the convex roller 5 to the other inside and outside may be formed at a position away from the flange bending portion, and can be changed as appropriate.

  For example, as shown in FIG. 9 and FIG. 10, the bending piece extending from the tip portion of the flange 31 is formed, and after forming the roller guide surface 31 a by punching, the bending piece is plastic. The retaining member 31b can be formed by bending. The space between both the retaining members 31b and 31b is elastically expanded by pushing the convex roller 5 from the inside and outside of the two columns 32 and 32. Thereby, the convex roller 5 enters the pocket 33. After the roller insertion, the retaining 31b is elastically recovered and overlaps the outer peripheral portion of the convex roller 5 with a gap g from the inside and outside.

  Moreover, when forming a recessed part in the end surface of a convex roller, retaining can also be formed in a large diameter ring part or a small diameter ring part. When a protrusion is formed on the punching cross-section that forms the inner periphery of the pocket, and the convex roller is pushed from the chamfered portion, the protrusion will escape due to elastic deformation on the cage side, and will enter by elastic recovery when it reaches the recess. You can also.

  As long as the roller guide surface is arranged so as to be slidable symmetrically on both sides in the circumferential direction with the axial plane including the roller's rotation axis as a boundary, the roller rolling is prevented from becoming unstable due to the difference in contact resistance. . For this reason, if a stopper is formed in the central portion in the circumferential direction of the plate thickness surface of the large-diameter side annular portion constituting the inner periphery of the pocket, it is possible to form roller guide surfaces at the two locations having the symmetry. it can.

  In addition, instead of the rolling element guide method using pillars as the cage guide type, the fact that the tip edge of the flange can be formed along the circumference is utilized, and the bearing ring guide method using the flanges of both large and small annular parts is used. It is also possible to do. The rolling element guide method is preferable to the raceway guide method in that it does not easily cause a revolution speed difference at the cage.

  In addition, the structure which concerns on the above-mentioned prevention can be applied not only to a convex roller but to a punching cage for a tapered roller, a cylindrical roller or the like.

Sectional drawing of the principal part of the self-aligning roller bearing which concerns on embodiment a is a cross-sectional view of the pocket of FIG. 1 cut along an axial plane including a roller rotation axis, b is a plan view of the pocket viewed from the direction of arrow B of the a, and c is a CC line of the a. Cross-sectional view, d is a cross-sectional view taken along line D-D of a. The partial expansion perspective view which looked at the flange of Drawing 1 from the front side 2 is an operation diagram showing a preparation state in which a roller is inserted into the pocket of FIG. 2, b is an operation diagram showing a state in which the roller is pushed into the pocket from the state a, and c is an elastic recovery state from the state b. Action diagram Rear view of the punching cage of FIG. 1 is a process diagram showing the forming process of the cup body in the manufacturing process of the punching cage of FIG. 1, b is a process chart showing the bottoming process, c is a process chart showing the flange bending process, and d is a process showing the punching process. Fig. E is a process chart showing extrusion molding a is a partially enlarged plan view showing a hole formed by the punching process of FIG. 6 from the diameter direction, and b is a cross-sectional view showing the hole a in a cut surface of an axial plane. Operational diagram showing how the assembly of FIG. a is a partially enlarged sectional view showing a pocket according to the modified example by a cut surface of the radial plane, and b is a partially enlarged sectional view showing the pocket portion of the modified example by a cut surface of the axial plane. FIG. 9A is an operation diagram showing how the convex rollers are inserted into the pocket of FIG. 9 by a cut surface of the axial plane, and b is an operation diagram showing the state of a by a cut surface of the radial plane. a is a partially enlarged longitudinal sectional view of a conventional punching cage, and b is a partially enlarged perspective view showing a pocket of the punching cage of a from obliquely outward. a is a process diagram showing a forming process of an annular body in a manufacturing process of a conventional punching cage, b is a process chart showing a punching process, and c is a process chart showing a flange bending process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Large diameter side ring part 1a, 31a Roller guide surface 2 Small diameter side ring part 3, 32 Pillar 4, 33 Pocket 5 Convex roller 6, 31 Flange 6a, 6b Planar part 6c, 31b Retraction 6d Depression 10 Punch holder 11 12 bearing ring 12a oil hole g gap r flange bending part

Claims (14)

  A plurality of columns extending between the large-diameter-side ring portion and the small-diameter-side ring portion, a plurality of pockets separated in the circumferential direction by the columns, a roller guide surface capable of sliding contact with an end surface of the revolving convex roller, In the punching cage in which the flange that raises the large-diameter side ring portion in the diametrical direction is formed, the roller guide surface is formed from a punched cross section formed in the large-diameter side ring portion of the inner periphery of the pocket. The punched cage is characterized in that the flange bending portion of the flange is formed in the large-diameter side ring portion over the entire circumference.   The end surface of the convex roller is a ground surface except for the chamfered portion, and the roller guide surface has a circumferential length that can secure a sliding contact range over the entire diameter of the ground surface during revolution. The punching cage according to claim 1, wherein the punching cage is provided.   3. The punching holding according to claim 1, wherein a flat portion slidably contacted with the rear surface of the flange of another isomorphous punching cage is formed on the rear surface of the flange so as to extend over the entire circumference in the circumferential direction. vessel.   The column is in contact with the outer peripheral portion of the convex roller from the inside or the outside, so that the convex roller is prevented from slipping out to the inside or outside, and among the flanges raised on the other side, the circumferential direction 4. A punching retainer according to claim 3, wherein a stopper that overlaps the outer peripheral portion of the convex roller with a gap from the inside and outside is formed in a portion located between each of the plurality of pockets.   The retainer includes a bulging portion that is swollen to the front side by extrusion molding applied to a portion of the flange positioned between the pockets, and the convex roller is formed in the pocket while causing elastic deformation of the flange. 5. The punching according to claim 4, wherein when the roller is pushed in, both the stoppers located on both sides in the circumferential direction of the convex roller are elastically recovered and overlap with the outer periphery of the roller with a gap from the inside and outside. Cage.   6. The punching cage according to claim 5, wherein a tip edge of the flange has a shape along a circumference.   The punching retainer according to claim 5 or 6, wherein the retainer swells most in the axial direction at the front end edge of the flange and further swells in the axial direction as it advances toward one of the inner and outer sides.   The punching retainer according to claim 7, wherein the stopper has a largest circumferential width at a front end edge of the flange, and the circumferential width becomes smaller as it advances toward one of the inner and outer sides.   The punch holder according to any one of claims 5 to 8, wherein a depression formed in a back surface of the flange along with the extrusion of the stopper is continuous with the flat portion.   The punching cage according to claim 9, wherein the recess extends to a leading edge of the flange.   A self-aligning roller bearing in which the punching cage according to any one of claims 3 to 10 is incorporated between a pair of inner and outer races in opposed pairs.   The self-aligning roller bearing according to claim 11, wherein a guide ring is not incorporated between the inner and outer race rings.   On the back surface of the flange, a depression accompanying the bulging of the stopper extends to the leading edge of the flange and continues to the flat surface portion, and lubricant is applied to the inner and outer race rings toward the depression. 13. The punching retainer according to claim 12, wherein an oil hole to be supplied is provided.   Forming an annular body with a large diameter at one end of the peripheral wall and a small diameter at the other end with a metal plate, flange processing for raising one end of the peripheral wall in the diametrical direction, and forming pockets between both ends of the peripheral wall In the manufacturing method of the punching retainer for performing punching processing for punching, the flange processing is performed before the punching processing, and the punching processing is performed from the flange bending portion formed by the flange processing in the peripheral wall. A method for manufacturing a punching retainer, wherein the punching retainer is punched so that a punching cross section of a ring portion on one end side is a cross section opposed to an end surface of a convex roller held in the pocket.

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