JP2009008164A - Cage manufacturing method, cage, and rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of manufacturing a cage by performing caulking processing without causing the generation of residual stress. <P>SOLUTION: In this technology for manufacturing the cage 8 in which a plurality of pockets 8p capable of holding a rolling element are arranged at a predetermined interval along the circumferential direction, a pair of wavy rings R1, R2 are opposingly arranged in which holding parts 8s bulging in substantially circular shapes and connecting parts 8j extending in substantially flat shapes are alternately continued along the circumferential direction, and caulking processing is applied to each rivet 10 in a state of the rivets 10 inserted in rivet holes H1, H2 formed to penetrate the connecting parts 8j. A required volume of a space for rivet caulking necessary upon applying the caulking processing to the rivet 10, and the volume of the rivet 10 before caulking processing are set to satisfy a relation of: rivet volume before caulking ≤ required volume for rivet caulking. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cage used for a rolling bearing, and more particularly, to a corrugated cage manufacturing technique in which a residual tensile stress does not occur after rivet caulking.

  2. Description of the Related Art Conventionally, various cages are used for bearings that support the rotation mechanisms of various devices in accordance with the purpose and environment of use. As an example, the deep groove ball bearing shown in FIG. 3 (a) includes a plurality of rolling elements that are rotatably incorporated between an inner ring 2 and an outer ring 4 that are opposed to each other so as to be relatively rotatable, and inner and outer rings 2 and 4. (Ball) 6, and between the inner and outer rings 2, 4, an annular corrugated cage 8 having a plurality of pockets 8 p for holding each rolling element (ball) 6 rotatably is arranged one by one. Has been.

  The corrugated cage 8 is formed by pressing a steel plate (for example, a low carbon steel such as SPCC material) and bulging it in a substantially arc shape, and a coupling portion 8j extending in a substantially flat shape. To couple a pair of corrugated rings R1, R2 (hereinafter referred to as first and second corrugated rings) alternately arranged along the circumferential direction and the first and second corrugated rings R1, R2 The plurality of rivets 10 are provided. In this case, in the state where the first and second wavy rings R1 and R2 are arranged to face each other so as to form a pocket 8p between the holding portions 8s, the coupling portions 8j are coupled to each other by the rivets 10, so that a plurality of One waveform holder 8 (see FIG. 1A) in which the pockets 8p are arranged at predetermined intervals (equal intervals in the drawing) along the circumferential direction can be configured.

  Here, a method of coupling the coupling portions 8j of the first and second wavy rings R1, R2 with the rivet 10 will be described. In this coupling method, for example, as shown in FIG. 3 (b), the coupling portions 8j of the first and second wavy rings R1 and R2 have first and second portions formed through the coupling portions 8j. Rivet holes H1 and H2 are formed. The rivet 10 is integrally formed at the base end of the rivet crimping portion 10a with a rivet crimping portion 10a having a size capable of being press-fitted into the first and second rivet holes H1, H2, and from the rivet crimping portion 10a. And a rivet head 10b having a large dimension. The first and second rivet holes H1 and H2 communicate with each other with the same dimensions.

  In this configuration, the rivet caulking portion 10a of the rivet 10 with respect to the first and second rivet holes H1, H2 in a state where the first and second wavy rings R1, R2 (joint portions 8j) are arranged to face each other. Press fit. In the drawing, as an example, the rivet caulking portion 10a is press-fitted from the first rivet hole H1 toward the second rivet hole H2 (see FIG. 1 (a)). The portion 10a may be press-fitted from the second rivet hole H2 toward the first rivet hole H1.

  Subsequently, for example, as shown in FIG. 3C, when the rivet caulking portion 10a is press-fitted into the first and second rivet holes H1 and H2 until the rivet head 10b of the rivet 10 contacts the first wavy ring R1. The portion of the rivet caulking portion 10a on the press-fitting tip side protrudes outside from the second rivet hole H2. At this time, the caulking process is performed by the caulking die 12 on the rivet caulking portion 10a of the protruding portion. In this case, the caulking die 12 has a caulking space 12h having a predetermined volume, and the caulking die 12 is connected so that the caulking space 12h communicates with the first and second rivet holes H1, H2. Set on the second wavy ring R2 side.

  In the caulking process, the portion of the rivet caulking portion 10a protruding from the second rivet hole H2 is accommodated in the caulking space 12h, and the rivet caulking portion 10a of the protruding portion is plastically deformed in the direction of the wavy ring R2. Tighten. As a result, a rivet caulking portion 10c having a shape matching the inner contour of the caulking space 12h is formed on the opposite side of the rivet head 10b across the first and second wavy rings R1, R2 (joint portion 8j). Molded. At this time, both the coupling portions 8j are coupled to each other while being sandwiched between the rivet head 10b and the rivet crimping portion 10c, and as a result, the first and second wavy rings R1 and R2 are connected to a plurality of rivets. One waveform holder 8 (see FIG. 1 (a)) coupled to each other is formed.

  By the way, in the coupling method as described above, after the caulking process, the rivet 10 is rattled in the first and second rivet holes H1, H2, or the first and second wavy rings R1, In order to prevent R2 from shifting, the volume of the rivet crimping portion 10a of the rivet 10 is normally set so as to satisfy the relationship of “volume before rivet crimping> volume required for rivet crimping”. The volume before rivet caulking refers to the volume of the entire portion of the rivet 10 before caulking processing excluding the rivet head 10b (ie, the entire rivet caulking portion 10a). The required volume refers to the total volume of the space volume of the entire first and second rivet holes H1, H2 and the space volume of the entire crimping space 12h of the crimping die 12.

  In this case, when the rivet caulking portion 10a having a volume larger than the rivet caulking required volume is caulked, the first and second rivet caulking portions 10a caulked by the caulking die 12 according to the difference volume. The rivet holes H1, H2 are pressed outward with a strong force. Depending on the degree of the pressing force at this time, there is a possibility that residual tensile stress F may be generated around the first and second rivet holes H1, H2. Specifically, as shown in FIGS. 3B and 3C, the hole dimensions of the first and second rivet holes H1 and H2 before the caulking process (the rivet hole dimensions before caulking) are W1, When the outer dimension of the rivet crimping portion 10a after the crimping process (the outer dimension of the rivet after the crimping) is W2, the relationship “the rivet hole dimension before crimping W1 <the rivet outer dimension after crimping W2” after the crimping process. When this occurs, the residual tensile stress F is always applied around the first and second rivet holes H1, H2.

In this state, when the deep groove ball bearing is rotated at a high speed, the corrugated cage 8 is subjected to fluctuations in the rolling elements (balls) 6 (for example, advance and delay of rolling) as well as load caused by excessive centrifugal force. The resulting load is applied. At this time, in addition to the residual tensile stress F, a load load is applied to the peripheral portions of the first and second rivet holes H1 and H2, and as a result, depending on the magnitude of the load load, In some cases, the second rivet holes H1 and H2 may be broken or broken from the peripheral portion. In this case, it becomes difficult to stably and smoothly hold the plurality of rolling elements (balls) 6 by the waveform holder 8, and as a result, the bearing cannot be used continuously over a long period of time. End up.
JP-A-10-238544

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a technique capable of manufacturing a cage by performing a caulking process without causing residual stress. .

  In order to achieve such an object, the present invention provides a pair of wavy shapes in which a holding portion swelled in a substantially arc shape and a coupling portion extended in a substantially flat shape are alternately continued along the circumferential direction. A plurality of pockets capable of holding the rolling elements are formed by applying a caulking process to the rivet in a state where the rings are arranged opposite to each other and the rivet is inserted into the rivet hole formed through the coupling portion. A method for manufacturing cages arranged at predetermined intervals along a direction, which includes a rivet caulking volume necessary for caulking the rivet and rivet caulking of the rivet before caulking The previous volume is set so as to satisfy the relationship of the volume before rivet crimping ≦ the volume required for rivet crimping.

  In the present invention, the rivet includes a rivet caulking portion to be inserted into the rivet hole, and the caulking die is caulked by the caulking die in a state where the rivet caulking portion is inserted into the rivet hole. Has a predetermined volume of caulking space, the volume before rivet caulking refers to the volume of the rivet caulking part before caulking processing, and the volume necessary for rivet caulking refers to the space of the entire rivet hole. It refers to the total volume of the volume and the space volume of the entire crimping space of the crimping mold. In this case, the rivet holes between the coupling portions of the pair of undulating rings may have the same shape or different shapes.

  Further, the present invention is a cage manufactured by the above-described cage manufacturing method, wherein a pressing portion is applied to a steel plate, and a holding portion that is expanded in a substantially arc shape and a coupling portion that is extended in a substantially flat shape. A plurality of pockets capable of holding rolling elements are arranged at predetermined intervals along the circumferential direction by mutually connecting a pair of wave-like rings that are alternately arranged along the circumferential direction with a plurality of rivets. Yes.

  Furthermore, the present invention is a rolling bearing using the above cage, comprising an inner ring and an outer ring that are opposed to each other so as to be relatively rotatable, and a plurality of rolling elements that are rotatably incorporated between the inner and outer rings. The retainer is provided between the inner and outer rings.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can perform a crimping process and produce a retainer, without producing a residual stress is realizable.

  Hereinafter, a cage manufacturing technique according to an embodiment of the present invention will be described with reference to the accompanying drawings. Since the present embodiment is an improvement of the above-described cage manufacturing technique (FIGS. 3A to 3C), only the improved portion will be described below. In this case, the same reference numerals as those used in the structure of the cage manufacturing technology in FIGS. A description thereof will be omitted.

  As shown in FIGS. 1 (a) to 1 (c), in the cage manufacturing technology of the present embodiment, the first and second rivet holes H1, of the first and second wavy rings R1, R2 (joint portion 8s) are provided. When the rivet caulking portion 10a of the rivet 10 inserted through H2 is caulked, the volume of the rivet caulking portion 10a satisfies the relationship “volume before rivet caulking ≦ required caulking volume”. Is set. The volume before rivet caulking refers to the volume of the entire portion of the rivet 10 before caulking processing excluding the rivet head 10b (ie, the entire rivet caulking portion 10a). The required volume refers to the total volume of the space volume of the entire first and second rivet holes H1, H2 and the space volume of the entire crimping space 12h of the crimping die 12.

  Here, as a method of satisfying the relationship of “volume before rivet caulking ≦ volume necessary for rivet caulking”, for example, when the spatial volume of the entire first and second rivet holes H1, H2 is constant, The above relationship can be satisfied by increasing or decreasing the crimping space 12h. In this case, as a method of increasing or decreasing the crimping space 12h, for example, the position of the crimping bottom surface 12m (FIG. 1 (c)) of the crimping mold 12 may be changed.

  As a specific example, in the rivet 10 in which the rivet caulking portion 10a is set to be relatively large (long), the caulking bottom surface 12m of the caulking die 12 is dimensioned according to the long amount of the rivet caulking portion 10a, for example. By expanding by H, the crimping space 12h can be increased so as to satisfy the above relationship. On the other hand, if the rivet caulking portion 10a is set to be relatively small (short), the caulking bottom surface 12m is narrowed by, for example, the dimension H, so that caulking is performed so as to satisfy the above relationship. The space 12h can be reduced. In addition, since the amount of wideness of the crimping bottom surface 12m is set to an appropriate amount according to the size of the rivet crimping portion 10a, the numerical value is not particularly limited here.

  When the rivet caulking portion 10a is caulked based on such setting, the relationship of “rivet diameter before caulking W1 ≧ rivet outer dimension after caulking W2” is maintained after the caulking process (FIG. 1 (b), (c)). The rivet hole dimension W1 before caulking is the hole dimension of the first and second rivet holes H1 and H2 before caulking, and the rivet outer dimension W2 after caulking is the rivet caulking part after caulking. It is the outer dimension of 10a.

  According to this relationship, the first and second rivet holes H1 and H2 are not pressed outward with a strong force by the rivet crimping portion 10a crimped by the crimping die 12 as in the prior art. . As a result, a corrugated cage 8 (FIG. 1 (a)) in which the residual tensile stress F is not applied around the first and second rivet holes H1, H2 is manufactured, and the inner and outer rings 2, 4 of the deep groove ball bearing are formed. Can be placed.

  When such a deep groove ball bearing is rotated at a high speed, the waveform retainer 8 is caused by a load load caused by an excessive centrifugal force and a variation of each rolling element (ball) 6 (for example, advance or delay of rolling). The applied load is applied. However, since the residual tensile stress F is not applied to the peripheral portions of the first and second rivet holes H1 and H2, no breakage or breakage occurs from the peripheral portions of the first and second rivet holes H1 and H2. . Thereby, it becomes possible to hold | maintain the some rolling element (ball) 6 stably and smoothly by the said waveform holder 8, As a result, a bearing can be used continuously over a long period of time.

  In the above-described embodiment, it is assumed that the first and second rivet holes H1 and H2 are configured to have the same dimensions. As a first modification instead of this, for example, as shown in FIG. As described above, the first and second rivet holes H1 and H2 may be formed in different shapes. Here, the hole diameter of the second rivet hole H2 is set larger than the hole diameter of the first rivet hole H1, and a cylindrical gap G is formed between the second rivet hole H2 and the outer shape of the rivet caulking portion 10a. did.

  According to this configuration, by adjusting the size of the gap G by increasing / decreasing the overall diameter of the second rivet hole H2, the size of the rivet caulking portion 10a (for example, length, thickness, etc.) can be adjusted. Thus, the volume of the rivet crimping portion 10a can be set with high accuracy so as to satisfy the relationship of “volume before rivet crimping ≦ volume required for rivet crimping”. In this case, since the rivet caulking portion 10a is press-fitted into the first rivet hole H1, the rivet caulking portion 10a is positioned and fixed in a state in which it is prevented from coming off from the first rivet hole H1. For this reason, the caulking process for the rivet caulking portion 10a can be performed stably without error. Since other effects are the same as those of the above-described embodiment, description thereof is omitted.

  Further, in the first modified example, the hole diameter of the entire second rivet hole H2 is set large. However, as a second modified example instead of this, as shown in FIG. The hole diameter of the second rivet hole H2 may be set partially larger than the hole diameter, and a cylindrical gap G may be formed between the second rivet hole H2 and the outer shape of the rivet caulking portion 10a. As an example, an insertion hole H3 (> H2) having a larger hole diameter is formed in the second rivet hole H2 on the press-fitting tip side of the rivet crimping portion 10a, and the outer shape of the insertion hole H3 and the rivet crimping portion 10a is formed. A cylindrical gap G was formed between the two. According to such a configuration, it is possible to prevent circumferential displacement during rivet caulking. Since the other effects are the same as those of the first modification described above, description thereof is omitted.

  In the first and second modified examples described above, the cylindrical gap G is assumed. As a third modified example instead of this, for example, as shown in FIG. The diameter of the entire second rivet hole H2 is inclined so as to extend toward the tip end of the press-fitting portion 10a, and a truncated cone shape is formed between the second rivet hole H2 and the outer shape of the rivet caulking portion 10a. The gap G may be configured. According to such a configuration, it is possible to prevent circumferential displacement during rivet caulking. Since the other effects are the same as those of the first modification described above, description thereof is omitted.

(a) is a perspective view showing the structure of a cage manufactured by the cage manufacturing technology according to an embodiment of the present invention, (b) is a rivet when manufacturing the cage of FIG. Sectional drawing which shows the state press-fitted in a rivet hole, (c) is sectional drawing which shows the state which has performed the crimping process to the rivet in the case of manufacture of the holder | retainer of the figure (a). (a) is sectional drawing which shows the structure of the cage manufacturing technique which concerns on the 1st modification of this invention, (b) is a cross section which shows the structure of the cage manufacturing technique which concerns on the 2nd modification of this invention FIG. 4C is a cross-sectional view showing a configuration of a cage manufacturing technique according to a third modification of the present invention. (a) is a perspective view partially showing a configuration of a deep groove ball bearing using a corrugated cage, (b) is a sectional view showing a state in which a rivet is press-fitted into a rivet hole in a conventional cage manufacturing technology. FIG. 4C is a cross-sectional view showing a state where a rivet is subjected to a caulking process in the conventional cage manufacturing technology.

Explanation of symbols

8 Retainer 8j Joint 8p Pocket 8s Retainer 10 Rivet
H1, H2 Rivet hole
R1, R2 wavy ring

Claims (6)

A pair of corrugated rings in which a holding part bulged in a substantially arc shape and a coupling part extended in a substantially flat shape are alternately arranged along the circumferential direction are arranged opposite to each other, and the coupling parts penetrate each other. With the rivet inserted into the rivet hole formed in this way, a retainer in which a plurality of pockets capable of holding rolling elements are arranged at predetermined intervals along the circumferential direction is manufactured by performing a caulking process on the rivet A way to
The rivet caulking required volume of the space required when caulking the rivet and the volume before rivet caulking of the rivet before caulking
A cage manufacturing method characterized by being set so as to satisfy a relationship of volume before rivet crimping ≦ volume necessary for rivet crimping. The rivet includes a rivet caulking portion that is inserted into the rivet hole. The rivet is caulked by the caulking die in a state in which the rivet caulking portion is inserted into the rivet hole. A volume caulking space is constructed,
The volume before rivet caulking refers to the volume of the rivet caulking part before caulking treatment, and the volume required for rivet caulking refers to the space volume of the entire rivet hole and the space volume of the entire caulking space of the caulking die. The cage manufacturing method according to claim 1, wherein the total volume is indicated.   The cage manufacturing method according to claim 1 or 2, wherein the rivet holes between the coupling portions of the pair of corrugated rings have the same shape.   The cage manufacturing method according to claim 1 or 2, wherein the rivet holes between the coupling portions of the pair of corrugated rings have different shapes. A cage manufactured by the cage manufacturing method according to any one of claims 1 to 4,
A pair of corrugated rings in which a holding part bulged in a substantially arc shape and a joint part extended in a substantially flat shape are alternately continued along the circumferential direction by pressing a steel plate with a plurality of rivets A cage in which a plurality of pockets capable of holding rolling elements are arranged at predetermined intervals along the circumferential direction by being coupled to each other. A rolling bearing in which the cage according to claim 5 is used,
The inner ring and the outer ring are arranged to face each other so as to be relatively rotatable, and a plurality of rolling elements are rotatably incorporated between the inner and outer rings, and the cage is provided between the inner and outer rings. Rolling bearing.

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