JP2002361347A - Forming device for column of retainer for rolling bearing, and retaining method for the column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance bearing performance by accurately working the mutual difference in pocket gaps for guiding rolling bodies in the circumferential direction, wherein pocket punching work is conducted astriding columns 8 not causing torsion. SOLUTION: In the retainer wherein pockets 5 for housing the rolling bodies respectively are formed by press working, when forming the columns 8 positioning among the pockets 5, part of both sides pockets for clamping the part which becomes the column 8 are simultaneously press-worked using punching parts 12a, 12b. After the press-working, the parts clamped by the both sides pockets are made to be the columns 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a column of a cage for a rolling bearing and an apparatus for forming the column, and more particularly, to a cage in which a pocket for accommodating a rolling element is formed by pressing. The present invention relates to a method of forming a column located between the two, and an apparatus for forming the column.

[0002]

2. Description of the Related Art FIG. 6 shows a general shape of a cylindrical roller bearing of NU type (including NJ type and NUP type).
In FIG. 1, the cylindrical roller bearing has a structure in which a plurality of rollers 3 as rolling elements are provided between an outer ring 1 and an inner ring 2. The plurality of rollers 3 are held in the retainer 4 to keep substantially the same distance from each other. Cage 4
Is composed of annular portions 6 and 7 and a plurality of column portions 8 provided between them. A portion between the annular portion 6 and the annular portion 7 and between the adjacent pillar portions 8 is called a pocket, and the roller 3 is accommodated in the pocket.

FIG. 7 shows a basic outline shape of the retainer 4. The retainer 4 has a plurality of pockets 5 for accommodating the rollers 3. This plurality of pockets 5
They are formed at equal circumferential intervals. Further, between the annular portion 6 and the annular portion 7 on both sides in the axial direction of the pocket 5, a column portion 8 that partitions between the pockets 5 is formed. A step is provided at the central portion in the axial direction of the column portion 8 on the inner diameter side.

FIG. 8 is a sectional view taken along the line AA 'in FIG. FIG. 2 shows a cross section of the column portion 8 of the cage 4. Referring to the figure, each pillar side surface of the pillar portion 8 has an angled surface 9 for guiding the roller 3 in the circumferential direction,
10 and 11 are formed by face pressing. The cage 4 can be manufactured by the following procedure. That is, a cage is formed by sequentially performing pocket punching press processing, step forming processing of a column in the center in the axial direction, face pressing to a column, low-dimension cutting, annular bending, and welding of an end to a strip-shaped material. 4 is formed. In the manufacturing process of the retainer 4, the column portion 8 is formed by subjecting the strip-shaped material to a pocket punching press process. In other words, in a conventional roller bearing press retainer, a conventional method of forming a pillar used to partition rollers and guide the rollers is to perform pocket punching press work for accommodating the rollers one by one in the circumferential direction. By processing, the portion left between each pocket is used as a pillar.

Here, a method of forming a pillar portion by pocket punching pressing will be described with reference to FIG.
FIG. 3A is a cross-sectional view showing the state of the press working, and FIG. 3B is a plan view of FIG. As shown in these figures, the column portion 8 is formed by pressing the plate surface of the flat sheet material 100 fed in the direction of arrow Y1 in the direction of arrow Y2 using a punch 12 and a die (not shown). It is formed by sequentially applying. In this case, the press working is performed so that the interval between the pockets 5, that is, the pocket pitch 500 is kept constant. In this conventional press working, the column portion 8 is twisted. This twist will be described with reference to FIG.

FIG. 10 is a cross-sectional view of a pillar portion corresponding to the portion C in FIG. 9A and formed by a conventional pocket punching press working. Referring to the figure, the column portion 8 is twisted. In FIG. 9, pockets are sequentially removed one by one at intervals of a pocket pitch 500, and the remaining portions become pillars. In this case, as the pillar portion 8 alone, the right side surface 8R is formed by removing the next pocket after the left side surface 8L is formed.
That is, with respect to the direction of the arrow Y1, the front portion of the column portion 8 is the left side surface 8L, and the rear portion is the right side surface 8R.

When forming the left side surface 8L, the area of the material maintains rigidity, so that the surrounding area is less affected by punching. On the other hand, when the right side surface 8R is formed, the shear force is greatly affected because the rigidity is provided only in the area of the width of the column portion 8. Particularly, in the case of a thin pillar, the pillar is largely dragged in the pulling direction. For this reason, when the conventional technique shown in FIG. 9 is adopted, the column portion 8 is twisted. Further, the pillar 8 actually formed is positioned with respect to the original center line 80 of the pillar 8.
The center position 80 ′ causes the misalignment 81.

In the above-described conventional method, a large twist is generated in the column portion 8 every time the pocketing process is performed. This is because the adjacent pocket is removed while leaving a space corresponding to the width of one pillar portion from the pocket removed first.
The timing at which this twist occurs is when the column 8 is completed. That is, the action of receiving the shearing force only in the pulling direction when the pocket is later pulled out causes a large twist in that direction. The torsion of the column 8 has a bad effect on the function as a retainer.

This twisting occurs because the rigidity of the column is small, and in order to prevent the torsion, it is an existing technique to use a plate holder (stripping) by a spring in the sense of fixing the column together with the press working. Also known as However, in order to increase the holding pressure so as to have the effect of preventing torsion, large equipment is required, and even if realized, the effect of suppressing torsion of the column is not perfect.

The difference in rigidity between the front and rear side surfaces of the pillar portion described above largely depends on the ratio of the pocket width dimension to the pillar dimension in the circumferential direction for the same plate thickness. Therefore, a large amount of twist is generated depending on the dimensional ratio. In recent years, with the increase in load capacity of bearings, the roller diameter and the number of rollers have been increased, and the column width in the circumferential direction of the cage has been forced to be extremely narrow.

Next, in a post-step of forming the column portion, a surface for guiding the rollers in the circumferential direction is pressed against the side surface of the column to form the roller. In this case, since a guiding surface is provided on the column side surface which has been twisted by the pocket punching press working, the accuracy of the shape and dimensions is hardly obtained. For example, the pillar has an asymmetrical shape on the front and rear side surfaces, or a circumferential pitch shift occurs.

Further, as a post-step of forming the pillar, there is a case where the pillar is stepped (shifted in the radial direction) and then subjected to face pressing. If the pillar is twisted, the larger the step difference, the larger the pillar is. The result is that the amount of torsion is promoted. As described above, the performance of the pillar forming affects the performance after the face pressing, and has a great influence on the accuracy of the pocket clearance as the retainer.

[0013]

In the above-mentioned prior art, since the difference between the pocket clearances of the cage is large (variation is large), the roller rolling surface guided in the bearing is uniform in all pockets. In addition, the cage is guided by a small number of rollers, so it is easy for unbalanced motion to occur, adversely affecting the temperature rise characteristics and vibration characteristics, and abnormal concentration of guides in limited pockets, resulting in abnormal wear. And there is a problem that seizure and damage to the cage are caused.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to accurately process the mutual difference between pocket clearances for guiding a rolling element in a circumferential direction. Another object of the present invention is to provide a method of forming a column of a cage for a rolling bearing, which can improve bearing performance, and a device for forming the column.

[0015]

According to a first aspect of the present invention, there is provided an apparatus for forming a pillar of a cage for a rolling bearing, wherein the pockets accommodating the rolling elements are formed by press working between the pockets. A pillar forming device located at a position including a punch member provided with an interval corresponding to the portion serving as the column, and a die member corresponding to the interval, and a press working by the punch member and the die member. A portion corresponding to the interval to be formed is defined as the column.

According to a second aspect of the present invention, there is provided an apparatus for forming a column of a cage for a rolling bearing according to the second aspect of the present invention, wherein a pocket for accommodating a rolling element is formed by press working. An apparatus, comprising: a punch member provided with an interval for simultaneously pressing adjacent ends of adjacent pockets; and a die member corresponding to the interval, and a press by the punch member and the die member. A portion corresponding to the space formed by processing is defined as the column.

According to a third aspect of the present invention, in the apparatus for forming a pillar of a cage for a rolling bearing according to the first or second aspect, the punch member has a hole having a size larger than half of the size of the pocket. First and second for forming respectively
Are provided at the intervals. According to a fourth aspect of the present invention, there is provided an apparatus for forming a pillar of a roller bearing retainer according to the third aspect, wherein the hole formed by the punch member is formed in a plate surface of a flat strip material.

According to a fifth aspect of the present invention, there is provided an apparatus for forming a pillar of a roller bearing retainer according to the third aspect, wherein the hole formed by the punch member is formed on one of an inner curved surface and an outer curved surface of a material having a curved surface. Characterized by being formed from According to a sixth aspect of the present invention, in the apparatus for forming a pillar of a roller bearing retainer according to the first or second aspect, the punch members each form a hole having a size smaller than half of the size of the pocket. And a second member for forming a portion other than a hole formed by the punch member in the pocket, further comprising another punch member. And

According to a seventh aspect of the present invention, there is provided an apparatus for forming a pillar of a cage for a rolling bearing according to the first or second aspect, wherein the punch member has a shape capable of forming a hole having the same shape as the pocket. It is characterized in that the same number of members are provided as the number of pockets of the cage, and all the pockets of the cage are simultaneously formed. The method of forming a column according to claim 8 of the present invention is a method of forming a column located between the pockets in a retainer in which pockets each accommodating a rolling element are formed by press working, wherein the column is formed. A part of the pockets on both sides sandwiching the portion is pressed simultaneously, and the portion sandwiched between the pockets on both sides is the pillar.

According to a ninth aspect of the present invention, there is provided a method of forming a pillar, comprising:
What is claimed is: 1. A method for forming a column located between pockets in a retainer in which pockets each accommodating a rolling element are formed by press working, wherein adjacent ends of adjacent pockets are simultaneously pressed and the pockets are formed. The portion sandwiched between the respective ends is the column.

In short, in the present invention, both side surfaces (before and after the pillar) of the pillar portion of the rolling bearing press retainer are simultaneously pressed, and a pocket is formed so that the resulting portion becomes a pillar. . In other words, a portion obtained by simultaneously punching adjacent ends of adjacent pockets is used as a pillar. As a result, the conditions for the punching process of the front and rear side surfaces of the column become the same, so that the formation of the sagging part, the shear surface, and the fracture surface become the same before and after the column, there is no torsion of the column, and there is no circumferential pitch shift. Disappears. Further, even in the face pressing in the post-process, since the symmetrical shape can be formed before and after the column, the variation in the pocket clearance can be extremely reduced. Therefore, the function of the cage can be improved.

[0022]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the same parts as those in the other drawings are denoted by the same reference numerals. (First Embodiment) FIG. 1 is a view showing the configuration of a first embodiment of a column forming device for a roller bearing cage according to the present invention. FIG. 2B is a top view, and FIG.
It is -X 'sectional drawing.

Referring to FIGS. 2A and 2B, in the present embodiment, the pockets 5 before and after the column portion 8 are sandwiched on the plate surface of the flat strip material 100 with the column portion 8 interposed therebetween. A part is simultaneously punched, and the remaining part is used as a pillar 8. Therefore, since the material 100 is fed in the direction of the arrow Y1, one pocket is formed by performing two stamping operations. The first time of this press blanking and 2
The time is the wrap portion 5 when viewed from the top of the pocket
It will have 0.

By forming such a pillar 8, the punching condition (vector of shear force) of the front and rear side surfaces in the feed direction of the material 100 with respect to the pillar 8 becomes the same, and the width of the pillar 8 is reduced. Even in a thin case, the occurrence of twisting of the column portion 8 can be eliminated. Since one pocket is formed by two press-cutting operations, in the present embodiment, as shown in FIG. 1, the size is slightly larger than half of the size of one pocket, and First and second punch portions 12a and 12b having an interval corresponding to a portion to be a column portion 8
Is used. Press working is also performed using a die corresponding to the interval between the first and second punches. That is,
As shown in FIG. 2 which is a cross-sectional view of a portion B in FIG. 1, first and second punch portions 12a and 12b having an interval corresponding to a pillar portion and a die having a width corresponding to the interval. The unit 120 is used. By doing so, the conditions for punching the front and rear side surfaces of the column portion 8 are the same, so that the sagging portion 8a, the shear surface 8b, and the fracture surface 8c are formed in the same manner. Therefore, the pillar portion 8 can be formed so that the cross section is symmetrical with respect to the center line 80 of the pillar.

In the present embodiment, the post-stage step processing (column post-processing) is performed by preventing the column from being twisted in the prior art and obtaining a column cross-sectional shape symmetrical with respect to the original column center line. The accuracy of the shape and dimensions obtained in each processing, such as shifting in the radial direction) and face pressing, is improved. As a result, since the gap between the respective pockets of the cage is good, when the cage is mounted on the bearing and operated, the cage is not guided by only a few pockets out of the number of used rollers, and all the pockets are not guided. The rollers are uniformly guided on each guide surface in the pocket. Therefore, since the local friction of the cage is suppressed, the cage is not damaged. In addition, vibration and temperature rise characteristics can be improved.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
Is shown. FIG. 1B is a top view, and FIG. 1A is a cross-sectional view taken along line XX ′ of FIG. 1B. This embodiment is a modification of the column forming in the first embodiment. In the above-described first embodiment, the joint for pressing the pocket 5 is set on the upper surface of the pocket. Therefore, the first embodiment is effective when it is necessary to perform the punching process across the entire column side surface.

On the other hand, in this embodiment, as shown in FIGS. 2A and 2B, the column portion 8 is formed by column portions D1 and D2 close to an annular portion and column portions sandwiched therebetween. The part is divided into a part E, and press working is performed over the pillar parts D1 and D2. In this case, even when the column rigidity is low only in the column E, the torsion of the column can be suppressed. For example,
If this embodiment is employed when the column width of the column portion E is extremely small, the column portion can be prevented from being twisted.

In this embodiment, in the first stage, the column portion E is punched out across the columns using the punches 12a and 12b, and in the second stage, the column portions D1 and D2 are punched out using the punch 12c for each pocket. Form pillars. In this example, the cross section of the punch 12c is rectangular as shown by a broken line. When these punches 12a, 12b, and 12c are used, unlike the case of the first embodiment, the first-stage press punching and the second-stage press punching are performed in the column-shaped convex portion 51 so as to match the press punching. Pressing of the stage is performed. Therefore, the boundary between the press-cutting is not conspicuous, and the appearance is improved.

That is, as in the case of the first embodiment, when the press punching is divided into two parts so that the stitch of the press punching is located at a position where it is linear when viewed from the upper surface of the pocket, the press punching is somewhat (A step in the axial direction). On the other hand, in the case of the present embodiment, it is possible to perform processing so that the junction of the press blanking is located at a position where there is no problem in the function of the bearing.

(Third Embodiment) In the above-described second embodiment, the joint at the time of stamping out the column is replaced with the column E.
And the column D1 and the column E and the column D2. This is because, as described above, it is assumed that only the column portion E has low rigidity. Therefore,
Depending on the rigidity of the column, the seam can be set elsewhere. For example, when the rigidity of each of the column portions E and the column portions D1 and D2 is low, it is necessary to simultaneously press-press both side surfaces of each portion. In this case, as shown in FIG. 4, the joints of the first-stage press blanking are connected to the pillars D1 and D2.
Set to a position close to the end of. If the joint is set at the position shown in FIG. 4, the column E and the columns D1, D
2 can be suppressed. In this case, the second-stage press punching that is performed for each pocket is performed by removing the d.
Is small, so that the processing is close to shaving processing.

As shown in FIG. 3C, which is an enlarged view of the column D1 in FIG. 3B, the column D1 (D
In step 2), a slight level difference m may occur due to a joint at the time of pressing. Even when the step m occurs, the surface pressing process is performed on the M portion in the figure to thereby obtain the surface 9, 9 shown in FIG.
No problem arises because of the formation of 10,11.

(Fourth Embodiment) In the case of the above-described first to third embodiments, one pillar portion necessary for one cage is formed one by one. On the other hand, in this embodiment, all the pillars required for one cage are formed simultaneously. To realize this embodiment, the same number of punches as the number of pockets required for one cage may be provided, and all pockets may be formed simultaneously.

As described above, if all the pillars necessary for one cage are formed at the same time, the blanking conditions can be made the same by simultaneously performing the punching process on the front and rear side faces in the same direction. In this way, prepare the mold for the number of pockets,
Even if all the pocket punching processes are performed at once, the effect of suppressing the torsion of the pillar portion can be obtained. (Fifth Embodiment) First Embodiment
In the fourth to fourth embodiments, pockets are formed on the plate surface of the flat plate material by punching with a punching member. On the other hand, as shown in FIG. 5, a pocket may be formed by punching holes from the inner curved surface of the material 101 having the curved surface by the punch members 12a and 12b. In other words, cages for cylindrical roller bearings and caged cages for tapered roller bearings having the same shape as above are formed by blanking and deep drawing to form cylinders, then pockets are removed, and surface pressing is performed on columns. Sometimes manufactured. In such a manufacturing method, as shown in the figure, by performing the press punching in the cylindrical state, the effect of suppressing the twisting of the column portion can be obtained.

That is, as shown in the figure, from the inner curved surface of the material 101 having the curved surface, the punch members 12a and 12b provided with the intervals corresponding to the pillar portions and the corresponding die members ( (Not shown), as shown in FIG. 2B viewed from the direction of the arrow Y3 on the inner curved surface side of the material 101, the pockets 5 before and after the column portion 8 are sandwiched by the portion to be the column portion 8. Are simultaneously punched, and the remaining portion is made into a pillar portion 8. Therefore, since the material 101 is fed in the direction of the arrow Y1, one pocket is formed by two press-cutting operations. The first and second times of this press blanking process are based on material 1
01 has a wrap portion 50 when viewed from the outer curved surface side. This formed pocket 5 is shown in FIG.
Is shown in FIG. 3C shows the material 1 in FIG.
It is a figure which shows the mode seen from arrow Y4 direction of 01 inside curved surface side.

By forming such a column portion 8, the punching conditions (vector of shear force) of the front and rear side surfaces in the feed direction of the material 101 with respect to the column portion 8 become the same, and the width of the column portion 8 is reduced. Even in a thin case, the occurrence of twisting of the column portion 8 can be eliminated. As a modification of this embodiment, a punch member is arranged on the side of the outer curved surface of the material having a curved surface, and a die member is arranged on the side of the inner curved surface. It may be punched at the same time. In short, a hole formed by the punch member is formed from one of the inner curved surface and the outer curved surface of the material having the curved surface.

(Method of Forming Columns of Cage for Rolling Bearing) In the apparatus of each embodiment described above, the following method of forming columns can be realized. That is, in a cage in which the pockets respectively accommodating the rolling elements are formed by press working, a column is formed between the pockets, and a part of the pockets on both sides sandwiching the column portion is simultaneously pressed. A method of forming a pillar of a cage has been realized, in which a portion between the pockets formed by processing is used as a pillar.
Further, in a cage in which the pockets respectively accommodating the rolling elements are formed by press working, a method of forming a column located between the pockets is performed, and adjacent ends of adjacent pockets are simultaneously pressed, and A method of forming a pillar of a retainer in which a portion sandwiched between ends of each pocket is a pillar has been realized.

By adopting such a method, since the column is not twisted by performing the pocket punching process across the column, the processing accuracy is improved with respect to the column step forming process and the face pressing process in the next step. Therefore, an accurate pocket clearance can be formed, and the function of the bearing can be improved.
In the above, the retainer of the cylindrical roller bearing has been described. However, the present invention is not limited to this, and the present invention is applied to a retainer formed by columns and pockets, such as a tapered roller bearing, a spherical roller bearing, a retainer of a needle bearing, and the like. Clearly, it is widely applicable.

[0038]

As described above, according to the present invention, in forming the pillar of the cage, the pillar is not twisted by performing pocket punching over the pillar, so that the pillar can be formed in the next step (shift). There is an effect that the processing accuracy is improved with respect to the face pressing, the pocket clearance can be formed with high precision as a cage, and the function of the bearing can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of a column forming device of a roller bearing cage according to a first embodiment of the present invention;
(A) is a sectional view, and (b) is a plan view.

FIG. 2 is a sectional view of a portion B in FIG.

FIG. 3 is a view showing a configuration of a main part of a column forming device of a roller bearing cage according to a second embodiment of the present invention;
(A) is a sectional view, and (b) is a plan view.

FIG. 4 is a diagram showing a configuration of a main part of a column forming device of a roller bearing cage according to a third embodiment of the present invention;
(A) is a cross-sectional view, (b) is a plan view, and (c) is an enlarged view of a pillar portion D1 in (b).

FIG. 5 is a view showing a configuration of a main part of a column forming device of a cage for a rolling bearing according to a fifth embodiment of the present invention;
(A) is sectional drawing, (b) is a figure which shows the state in the middle of processing of a pillar part, (c) is a figure which shows the pillar part which was formed.

FIG. 6 is a view showing a general shape of a cylindrical roller bearing.

FIG. 7 is a diagram showing a basic contour shape of a cage.

FIG. 8 is a sectional view taken along the line A-A 'in FIG.

9A is a cross-sectional view showing a state of press working in a conventional apparatus, and FIG. 9B is a plan view of FIG. 9A.

FIG. 10 is a cross-sectional view of a column portion corresponding to the portion C in FIG. 9A and formed by conventional pocket punching press working.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 4 Cage 5 Pocket 6 and 7 Annular part 8a Dripping part 8b Shear surface 8c Breaking surface 8R Right side 8L Left side 8 Column part 12,12a, 12b, 12c Punch part 50 Lapping part 80 Center line 100, 101 material 120 die part

Claims (9)

[Claims] An apparatus for forming a pillar, which is located between pockets in a retainer in which pockets each accommodating a rolling element are formed by press working, wherein an interval corresponding to a portion serving as the pillar is provided. A punch member and a die member corresponding to the interval, wherein a portion corresponding to the interval formed by press working with the punch member and the die member is the pillar, Equipment for forming bowls. 2. A molding device for a pillar, wherein pockets for accommodating rolling elements are formed by press working, respectively, wherein the adjacent ends of adjacent pockets are simultaneously pressed. Including a punch member provided with an interval for processing and a die member corresponding to the interval, a portion corresponding to the interval formed by press working with the punch member and the die member is the column. An apparatus for forming a pillar of a cage for a rolling bearing. 3. The punch member according to claim 1, wherein first and second members for forming holes each having a size larger than half the size of the pocket are provided at the interval. 3. The apparatus for forming a pillar of a cage for a rolling bearing according to claim 1, wherein: 4. The apparatus according to claim 3, wherein the hole formed by the punch member is formed in a plate surface of a flat band material. 5. The molding of a pillar of a roller bearing retainer according to claim 3, wherein the hole formed by the punch member is formed from one of an inner curved surface and an outer curved surface of a material having a curved surface. apparatus. 6. The punch member includes a first member and a second member for forming holes each having a size smaller than half of the size of the pocket, the first member and the second member being provided at the interval. 3. The apparatus according to claim 1, further comprising another punch member for forming a portion of the pocket other than the hole formed by the punch member. 7. The punch member has a shape capable of forming a hole having the same shape as the pocket, and the punch members are provided in the same number as the number of the pockets of the retainer, and all the pockets of the retainer are simultaneously formed. 3. The apparatus for forming a pillar of a cage for a rolling bearing according to claim 1, wherein: 8. A method for forming a pillar, wherein pockets for accommodating rolling elements are formed by press working, wherein the pillars are located between the pockets. Forming a portion between the pockets on both sides by pressing at a time. 9. A method of forming a column located between pockets in a cage in which pockets respectively accommodating rolling elements are formed by press working, wherein adjacent ends of adjacent pockets are simultaneously pressed. The method of forming a pillar, wherein the pillar is formed by processing and a portion sandwiched between ends of the pockets is used as the pillar.