JP2015203438A - Process of manufacture of waveform cage, and the waveform cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a structure having superior durability by forming a surface hardened layer at an opposite side surface part opposing to an inside surface of the head part of the rivet in the outer side surface of one cage element even in the case when a nitriding treatment is applied in a state in which a rivet is assembled to the one cage element.SOLUTION: A protrusion part 21 is formed at an opposing side surface part 20 of one cage element 8. Then, a clearance 23 is formed between an inside surface 19 of a head part 15 of each rivet 9 and a portion other than each protrusion part 21 in the opposing side surface part 20 in a state in which an intermediate assembly 17b is constituted by press fitting a large diameter part 18 of each rivet 9 into each of through-holes 12a. In this state, nitriding treatment is applied to the intermediate assembly. On the other hand, nitriding treatment is applied to a single unit of the other cage element. Then, the protrusion part 21 is pressed and crushed by the head part 15 of each rivet 9 in a state in which the other cage element is assembled to the intermediate assembly 17b and a caulked part is formed.

Description

  The present invention holds a ball that constitutes various rolling bearings incorporated in a rotational support portion of a radial ball bearing or the like, an automobile auxiliary machine such as a car transmission, a compressor for a car air conditioner, or various machines for general industries. The present invention relates to a method for manufacturing a waveform holder and an improvement in the structure of the waveform holder.

  For example, a single-row deep groove type ball bearing 1 as shown in FIG. 20 is widely used as a rolling bearing incorporated in a rotation support portion of various mechanical devices. The ball bearing 1 is provided between an inner ring 3 having an inner ring raceway 2 on an outer peripheral surface, an outer ring 5 having an outer ring raceway 4 on an inner peripheral surface, and the inner ring raceway 2 and the outer ring raceway 4 so as to be capable of rolling. A plurality of balls 6 and a cage 7 that holds the balls 6 so as to roll freely are provided.

  Of these, the cage 7 is called a waveform cage as described in, for example, Patent Documents 1 to 5, and includes a plurality of pairs of cage elements 8 and 8 as shown in FIGS. The rivets 9 and 9 are joined together. Both of these cage elements 8 and 8 are formed into a corrugated annular shape by punching and bending a metal plate material such as a steel plate and a stainless steel plate by a press. Both of these cage elements 8, 8 include a plurality of circumferentially curved curved plate portions 10, 10 at a plurality of locations in the circumferential direction, and a flat plate portion 11, between the curved plate portions 10, 10 adjacent in the circumferential direction, 11 is provided with through-holes 12 and 12 in the center of each flat plate portion 11 and 11, respectively. Each of the rivets 9 and 9 is made of a metal such as steel or stainless steel, and includes a flange portion 13 and a head portion 15 provided at a base end portion of the flange portion 13.

  The retainer 7 overlaps the flat plate portions 11 and 11 of the retainer elements 8 and 8 with each other, and the through holes 12 formed at positions where the flat plate portions 11 and 11 are aligned with each other. 12 with the flanges 13 of the rivets 9 and 9 inserted therethrough, the tip portions of these flanges 13 are crushed to form the crimped portions 14, and the flat plate portions 11 and 11 that are overlapped with each other are The rivets 9 and 9 are joined by being sandwiched between the head 15 and the caulking portion 14. In this state, the portions surrounded by the curved plate portions 10 and 10 serve as pockets 16 and 16 for holding the balls 6 in a rollable manner.

  The ball bearing 1 provided with the cage 7 as described above is incorporated in a rotation support portion such as the other end portion of a rotating shaft whose one end portion is connected to a movable scroll of a scroll compressor for refrigerant compression, for example. In some cases, the inner ring 3 and the outer ring 5 are used in an eccentric or inclined state. In such a case, during operation, a large force may act on the cage 7 from the balls 6 due to the difference in the revolution speed of the balls 6. In this case, it is necessary to ensure sufficient durability of the cage 7. Specifically, it is necessary to sufficiently secure the strength of the two retainer elements 8 and 8 and the rivets 9 and 9 constituting the retainer 7. As a method of improving the strength of each of these members 8 and 9, there is a method of increasing the thickness of both of these cage elements 8 and 8 and the diameter of each of these rivets 9 and 9, but cannot be adopted due to dimensional constraints. Not a few. On the other hand, for example, a nitride layer (a hardened surface layer by nitriding treatment) is formed on the surface of each member 8 and 9 as a method that can achieve the same purpose with almost no dimensional change of each member 8 and 9. The forming method has been widely known, for example, as described in Patent Document 2. Hereinafter, the invention described in Patent Document 2 will be described with reference to FIG.

  In the case of the invention described in Patent Document 2, first, as shown in FIG. 22, the inner side surfaces of the flat plate portions 11, 11 of both the cage elements 8, 8 are opposed to each other through a gap. The flanges 13 and 13 of the rivets 9 and 9 are inserted into the through holes 12 and 12 formed in the matching portions of the flat plates 11 and 11 to form an intermediate assembly 17. In the state of the intermediate assembly 17, a gap is provided between the outer peripheral surface of the flanges 13 and 13 of the rivets 9 and 9 and the inner peripheral surface of the through holes 12 and 12. . Next, the intermediate assembly 17 is subjected to nitriding treatment. The nitriding method is the same as the conventional nitriding method, and is also described in Patent Document 2, so that the description thereof is omitted. Thereafter, in the state where the inner side surfaces of the flat plate portions 11 and 11 of the both cage elements 8 and 8 are abutted with each other, the tips of the flange portions 13 and 13 of the rivets 9 and 9 are caulked (plastically deformed). Thus, both the cage elements 8 and 8 are coupled and fixed together.

  In the case of the invention described in Patent Document 2 as described above, as shown in FIG. 23, a nitride layer 35 is formed on the surfaces of both the cage elements 8 and 8 and the surfaces of the rivets 9 and 9, The durability of the cage 7 can be improved. However, in the state of the intermediate assembly 17 as described above, the rivets 9 and 9 are not prevented from coming off in the axial direction with respect to the through holes 12 and 12. For this reason, when the intermediate assembly 17 is incorporated into a nitriding apparatus or when the nitriding process is performed, the rivets 9 and 9 may fall out of the through holes 12 and 12.

  In Patent Document 2, the rivets 9 and 9 are inserted only into the through holes 12 and 12 of one of the cage elements 8 (upper side in FIG. 22) of the cage elements 8 and 8. The intermediate assembly constructed by doing this, that is, the intermediate assembly in which the other retainer element 8 (lower side in FIG. 22) is omitted from the intermediate assembly 17 shown in FIG. The other cage element 8 also describes an invention in which after nitriding is performed in a single state, both the cage elements 8 and 8 are bonded and fixed to each other by the rivets 9 and 9. However, in the case of such an invention, the same problem as in the case of the above-described invention, that is, the rivets 9 and 9 may fall out of the through-holes 12 and 12 during the nitriding process. Have problems.

  Further, Patent Document 2 also describes that both the cage elements 8 and 8 and the rivets 9 and 9 are subjected to nitriding treatment in a single state. However, when each of the rivets 9 and 9 is subjected to nitriding treatment in a single state, each of the rivets 9 and 9 is a very small part, and in order to perform nitriding treatment on the entire surface of each of the rivets 9 and 9 In some cases, troublesome work and special equipment (such as jigs) are required in the nitriding process. Specifically, when nitriding is performed on small parts such as the rivets 9 and 9, it is conceivable to perform nitriding with the rivets 9 and 9 being put together in a cage or the like. However, when the rivets 9 and 9 are subjected to nitriding treatment in such a state, it is difficult for nitrogen to enter the portion where the rivets 9 and 9 are in contact with each other (overlap). As a result, it is difficult to grasp in which part of the rivets 9 and 9 the surface hardened layer is formed, and the strength of the rivets 9 and 9 may not be stably improved. On the other hand, when nitriding is performed in a state where the rivets 9 and 9 are aligned so that the rivets 9 and 9 do not come into contact with each other, it is troublesome to align the rivets 9 and 9. And a jig or the like for preventing the rivets 9 and 9 from falling down is necessary, and the manufacturing cost increases.

[Description of Prior Invention]
Therefore, the inventors of the present invention have made the following invention in order to prevent the rivets 9 and 9 from coming off from the through holes 12 and 12 of the cage elements 8 and 8.
Hereinafter, this prior invention will be described with reference to FIG.
In the case of this prior invention, a large-diameter portion 18 is provided in a portion closer to the head portion 15 of the flange portion 13 of each of the rivets 9 and 9 before the caulking portion 14 (see FIG. 23) is formed. The large-diameter portion 18 has an outer diameter D ₁₈ that is slightly larger than the inner diameter d ₁₂ of each through-hole 12 of the cage element 8 on the one side {above FIG. 24B} (D ₁₈ > d ₁₂ ). Further, the outer diameter D ₁₃ of the portions other than the large-diameter portion 18 of the rod portion 13 of each rivet 9, 9 is smaller than the inner diameter d ₁₂ of the through-hole 12 of the one retainer element 8 _(D 13 _<d 12). In the case of the structure shown in FIG. 24, the inner diameter dimension of each through hole 12 of the other cage element 8 is equal to the inner diameter dimension d ₁₂ of each through hole 12 of the one cage element 8.

  In the case of such a prior invention, as shown in FIG. 24 (a), in the state where the heads 15 of the rivets 9 are arranged outside the one cage element 8 (upper side in FIG. 24), The intermediate assembly 17a is configured by temporarily fixing the rivets 9 to the one retainer element 8 by press fitting the diameter portions 18 into the through holes 12. Next, nitriding is performed on the intermediate assembly 17a. On the other hand, the other cage element 8 is subjected to nitriding in a single state.

  Therefore, in the case of the prior invention as described above, the other cage element 8 has a nitride layer formed on the entire peripheral surface thereof. On the other hand, in the intermediate assembly 17a, the large-diameter portion 18 of each of the rivets 9, 9 is press-fitted and fitted into the through hole 12 of the one retainer element 8. For this reason, a nitrided layer is not formed on the inner peripheral surface portion of the large-diameter portion 18 and the through-hole 12 of the one retainer element 8 in contact with the large-diameter portion 18.

  In the case of the prior invention as described above, as shown in FIG. 24 (b), the flat plate portion 11 of the intermediate assembly 17a and the flat plate portion 11 of the other cage element 8 are overlapped at the same time. The balls 6 (see FIG. 20) are sandwiched between the inner surfaces of the curved plate portions 10 and 10 of the cage elements 8 and 8. In this state, the retainer elements 8 and 8 are coupled and fixed to each other by caulking the tips of the rivets 9 and 9.

  Incidentally, in the case of the above-described prior invention, in the state where the intermediate assembly 17a is configured, the inner surface 19 (the lower surface in FIG. 24) of the head 15 of the rivets 9, 9 and the one retainer element 8 are arranged. Of the outer side surface (upper surface in FIG. 24), the opposite side surface portion 20 facing the inner surface 19 of the head 15 is in contact. Therefore, if the nitriding treatment is performed in this state, a nitrided layer cannot be formed on both the surfaces 19 and 20, and the rigidity of these surfaces 19 and 20 may not be sufficiently secured. If the caulking portion 14 is to be formed in such a state, the opposing side surface portion 20 is depressed as shown in FIG. 25 based on the axial pressing force applied to the rivets 9 and 9. there is a possibility. As a result, there is a possibility that the durability of the retainer element 8 may be impaired due to cracks in the one retainer element 8 during use.

JP-A-7-301242 JP-A-10-281163 JP-A-11-179475 JP 2009-8164 A JP 2009-236227 A

  In view of the circumstances as described above, the present invention provides the outer surface of the one retainer element even when the surface hardening treatment is performed in the state of an intermediate assembly in which a plurality of rivets are assembled to one retainer element. Of these, by forming a hardened surface layer on the inner surface of the rivet head, a corrugated cage structure with excellent durability and a method for manufacturing such a corrugated cage should be realized. Invented.

The waveform holder that is the subject of the present invention comprises a pair of holder elements and a plurality of rivets.
Both of these cage elements are each made of a metal plate into a corrugated annular shape, with partial spherical curved plate portions at multiple locations in the circumferential direction, and between adjacent curved plate portions in the circumferential direction. A flat plate portion is provided therebetween, and a through hole is provided in a part of each flat plate portion.
Each of the rivets is made of metal and includes a flange portion and a head portion having a diameter larger than that of the flange portion provided at a base end portion of the flange portion.
Then, the flat plate portions of the two cage elements are overlapped with each other, and the leading end portions of the hook portions are inserted into the through holes of the flat plate portions overlapped with each other. Squeezing to form a caulking portion having a diameter larger than each of the flange portions, and joining the flat plate portions overlapped with each other by sandwiching the head portion and the caulking portion of each rivet, The part surrounded by the curved plate part is used as a pocket to hold the ball freely rolling.

In particular, in the case of the method for manufacturing a waveform holder according to claim 1 of the present invention, the outer surface of one of the cage elements in the state before forming the caulking portion ( A convex portion is formed at the position of at least one of the opposing side surface portions facing the inner side surface of the head portion of the rivet around each through hole in the side surface on the side where the head portion of the rivet is disposed.
Further, the convex portion of the opposing side surface portion is press-fitted into the through hole of the one retainer element until the inner side surface of the head portion and the convex portion are in contact with each other. An intermediate assembly is formed in which a gap is formed between the other portion and the inner side surface of the head. Next, the intermediate assembly is subjected to surface hardening treatment, and the other of the two cage elements is subjected to surface hardening treatment as it is.
And the part which protruded from each through-hole of said one retainer element among the collar parts of each rivet which comprises the said intermediate assembly is inserted in each through-hole of said other retainer element, and both said holders In a state where the flat plate portions of the elements are overlapped, the convex portion is crushed by the head portion, and the caulking portion is formed at the distal end portion of the flange portion.

Note that the opening widths at both ends of each pocket constituting a general corrugated holder are smaller than the diameter of the ball to be held in each pocket. For this reason, in the case of such a general waveform holder, the balls cannot be incorporated into the pockets in a completed state. Accordingly, when the above-described manufacturing method of the present invention is implemented for such a general waveform holder, as described above, a curved plate of a pair of cage elements is formed before the caulking portion is formed. It is necessary to sandwich each ball between the inner surfaces of the parts.
On the other hand, although it is a special example, after completion, only one of the opening widths at both ends of each pocket is smaller than the diameter of the ball to be held in each pocket. When the above-described manufacturing method of the present invention is applied to the corrugated cage whose other opening width is larger than the diameter of each of these balls, it is not necessarily necessary to form the caulking portion before forming the caulking portion. It is not necessary to sandwich each ball between the inner surfaces of the curved plate portions of the pair of cage elements.

The corrugated cage manufacturing method of the present invention includes, for example, the following manufacturing method in order to improve the durability of the inner peripheral surface of each through hole and the outer peripheral surface of the flange portion of each rivet. It can be implemented together. Specifically, a portion closer to the head of the rivet portion of each of the rivets in a state before forming the caulking portion, and each through hole of one of the cage elements of the two cage elements. A spline that is an uneven surface extending in the circumferential direction is formed in any one of the peripheral surfaces.
Further, the other part is a cylindrical surface that can be fitted with a convex portion of each spline and having a tightening allowance.
And in the state which fitted the convex part of each said spline, and the said cylindrical surface by interference fit, a clearance gap exists between the recessed part of these each spline, and this cylindrical surface facing these each recessed part.

Alternatively, the corrugated cage manufacturing method of the present invention is combined with the following manufacturing method in order to improve the durability of the inner peripheral surface of each through-hole and the outer peripheral surface of the collar portion of each rivet. It can also be implemented. Specifically, a columnar large-diameter portion is provided in a portion closer to the head of the flange portion of each rivet before the caulking portion is formed.
In addition, the shape of each through hole of one of the cage elements is formed in a non-circular shape, for example, and a large diameter of each rivet is formed on a part of the inner peripheral surface of each through hole. The fitting part which can be fitted in the state which has a part and a fastening allowance is provided. In addition, in the state where the large diameter portion of each rivet is press-fitted into the fitting portion of each through hole, the remaining portion and the outer peripheral surface of the large diameter portion of each rivet A non-fitting portion in which a gap is formed is provided.

In the present invention, the waveform holder according to claim 2 is the state of the outer surface of one of the cage elements in the state before the caulking portion is formed. Around each through-hole, a convex portion is formed at at least one position of the opposing side surface portion that faces the inner surface of the rivet head.
The rivets and the one retainer element contact the flange of the rivet and the through hole of the one retainer element, and the inner surface of the head of the rivet and the convex portion abut. The surface is hardened in a state of an intermediate assembly in which a gap is formed between a portion other than the convex portion of the opposite side surface portion and the inner side surface of the head portion. is there.
On the other hand, the other cage element of both the cage elements is subjected to surface hardening treatment as it is.
And the part which protruded from each through-hole of said one holder element among the collar parts of each rivet which comprises the said intermediate assembly is penetrated to each through-hole of said other holder element, and both said holders The convex portions are crushed by the head in a state where the flat plate portions of the element are overlapped to form the caulking portion.

  The waveform holder of the present invention as described above has the following waveform holding, for example, in order to improve the durability of the inner peripheral surface of each through-hole and the outer peripheral surface of the flange portion of each rivet. It can be implemented together with the structure of the vessel. Specifically, the inner peripheral surface of each through hole of one of the cage elements of the rivet of each rivet in the state before the caulking portion is formed, and one of the cage elements And a spline that is a concave-convex surface extending in the circumferential direction, and the other part can be fitted with a convex portion of each spline and a tightening allowance. And

Alternatively, the corrugated cage of the present invention as described above has the following corrugated cage in order to improve the durability of the inner peripheral surface of each through-hole and the outer peripheral surface of the flange portion of each rivet. It can also be implemented in conjunction with the structure. Specifically, each of these rivets in a state before forming the caulking portion has a cylindrical large-diameter portion in a portion near the head portion of the flange portion.
Further, the shape of each through hole of one of the cage elements is formed in a non-circular shape, for example, and a large diameter of each rivet is formed on a part of the inner peripheral surface of each through hole. The fitting part which can be fitted in the state which has a part and a fastening allowance is provided. In addition, a gap is formed between the remaining portion and the outer peripheral surface of the large diameter portion in a state where the large diameter portion of each rivet is press-fitted into the fitting portion in the remaining portion of the inner peripheral surface of each through hole. A non-fitting portion is provided.

According to the present invention configured as described above, even when a surface hardening process is performed in a state of an intermediate assembly in which a plurality of rivets are assembled to one cage element, the outer surface of the one cage element is In addition, a hardened surface layer can be formed on a portion facing the inner side surface of the head of the rivet, and a corrugated cage excellent in durability can be obtained.
That is, in the case of the present invention, of the outer surface of the one retainer element in the state before the caulking portion is formed, the opposing side surface that faces the inner surface of the head portion of the rivet around each through-hole. A convex part is formed on the part. For this reason, in the state of an intermediate assembly configured by combining the one retainer element and the rivet, between the portion other than the convex portion of the opposed side surface portion and the inner side surface of the head portion. A gap can be provided. As a result, even when nitriding is performed in the state of such an intermediate assembly, a nitride layer can be formed in a portion other than the convex portion of the opposing side surface portion of the one cage element. Accordingly, the strength of the opposing side surface portion of the one cage element is secured, and when the caulking portion is formed, the opposing side surface portion is prevented from being depressed, and the durability of the cage can be secured.

FIG. 3 is a partial cross-sectional view of an intermediate assembly corresponding to the AA cross section of FIG. 2, showing a first example of an embodiment of the present invention. Similarly, the partial top view for demonstrating the convex part formed in the circumference | surroundings of a through-hole among the outer surfaces of one cage | basket element. Similarly, the same figure as FIG. 2 for demonstrating another aspect of a convex part. FIG. 24 is a partial cross-sectional view of the cage corresponding to the BB cross section of FIG. 23 for explaining the effect of the present invention. The figure similar to FIG. 1 which shows the 2nd example of embodiment of this invention. Similarly, the same figure as FIG. Similarly, the same figure as FIG. The figure similar to FIG. 1 which shows the 3rd example of embodiment of this invention. Similarly, the same figure as FIG. Similarly, the same figure as FIG. FIG. 22 is a view illustrating a fourth example of the embodiment of the present invention, illustrating the shapes of the through hole of one cage element and the shape of the rivet head portion near the head in the intermediate assembly state. The partial expanded sectional view equivalent to the expanded CC cross section. Similarly, the figure similar to FIG. 24 corresponding to the DD cross section of FIG. The figure similar to FIG. 11 which shows the 5th example of embodiment of this invention. The figure similar to FIG. 11 which shows the same 6th example. The figure similar to FIG. 11 which shows the said 7th example. The figure similar to FIG. 11 which shows the said 8th example. The figure similar to FIG. 11 which shows the 9th example. The figure similar to FIG. 11 which shows the 10th example. The figure similar to FIG. 11 which shows the 11th example. The half part sectional view of the ball bearing incorporating the corrugated cage used as the object of the present invention. The perspective view which similarly takes out and shows a waveform holder. The fragmentary sectional view of the intermediate assembly for demonstrating about the method of performing the conventional surface treatment. The partial sectional view of the waveform holder which shows the state after performing nitriding treatment similarly. The partial cross-sectional view (a) of the intermediate assembly for demonstrating the manufacturing method of a prior invention, and the partial cross-sectional view (b) which show the state just before caulking and fixing both cage elements with a rivet. The figure similar to FIG.24 (b) for demonstrating the problem which arises with the manufacturing method of a prior invention.

[First example of embodiment]
1 to 4 show a first example of an embodiment of the present invention. The feature of this example is that the structure of one of the cage elements 8 of the pair of cage elements 8 and 8 constituting the cage is devised. Since the manufacturing method and structure other than this characteristic part are almost the same as the manufacturing method and structure of the waveform retainer of the previous invention described above, the description of the parts configured similarly to the previous invention or the conventional structure will be simplified. Hereinafter, the characteristic part of this example will be mainly described. Although this example is intended for a general waveform holder, this general waveform holder is, as described above, in the completed state, the opening width at each end of each pocket is within each of these pockets. Says what is smaller than the diameter of the ball to be held.

  The waveform holder of the present example is similar to the waveform holder 7 of the conventional structure shown in FIGS. 20 to 23, in order to join a pair of cage elements 8 and 8 and both of these cage elements 8 and 8 together. And a plurality of rivets 9. Of these, both cage elements 8 and 8 are formed into a corrugated annular shape by stamping and bending a metal plate material such as a steel plate and a stainless steel plate that can be nitrided. It has been. Both of these cage elements 8, 8 include a plurality of circumferentially curved curved plate portions 10, 10 at a plurality of locations in the circumferential direction, and a flat plate portion 11, between the curved plate portions 10, 10 adjacent in the circumferential direction, 11 is provided with a through-hole 12a at the center in the circumferential direction of each of the flat plate portions 11 and 11, respectively. Each of the rivets 9 is made of a metal that can be nitrided, such as steel or stainless steel, and includes a flange 13 and a head 15 provided at the base end of the flange 13.

Also in the case of this example, similarly to the above-described invention, the large diameter portion 18 is provided on the portion near the head portion 15 of the collar portion 13 of each rivet 9 before the caulking portion 14 is formed. ing. The large-diameter portion 18 has an outer diameter D ₁₈ that is slightly larger than an inner diameter d ₁₂ of each through hole 12a of the one retainer element 8 (D ₁₈ > d ₁₂ ). In addition, the outer diameter D ₁₃ of the portion other than the large diameter portion 18 of the flange portion 13 of each rivet 9, 9 is smaller than the inner diameter d ₁₂ of the through hole 12 a of the one cage element 8. _(D 13 _<d 12). The inner diameter dimension of each through hole 12 of the other cage element 8 is equal to the inner diameter dimension d ₁₂ of each through hole 12a of the one cage element 8.

  In particular, in the case of the corrugated cage of the present invention, of the two cage elements 8, 8, the outer surface of one cage element 8 (the side surface on the side where the head 15 of each rivet 9 is disposed, 2 of the opposing side surface portion 20 (portion shown by a slanted lattice in FIG. 2) which is a portion facing the inner side surface 19 of the head portion 15 of each rivet 9 at an equal interval in the circumferential direction. Protrusions 21 and 21 are formed at the positions. Note that the positions and the number of the projections 21 and 21 are not limited to those shown in FIG. For example, as shown in FIG. 3 (a), it is formed at only one position in the circumferential direction of each through hole 12a in the opposing side surface portion 20, or as shown in FIG. 3 (b). Forming at three positions in the circumferential direction of each through-hole 12a in the side surface portion 20, or forming at four positions in the circumferential direction of each through-hole 12a in the opposing side surface portion 20. You can also.

Next, the manufacturing method of the waveform holder of this example having the above configuration will be described.
First, the intermediate assembly 17b shown in FIG. 1 is assembled in the same manner as the previous invention. Specifically, the head 15 of each of the rivets 9 is disposed on the outer side (upper side in FIG. 1) of one of the cage elements 8 and 8, and the large-diameter portion 18 is disposed. These are fitted into the through holes 12a by press fitting. Further, in this state, the inner side surface 19 of the head portion 15 of each rivet 9 and the front end surface 22 of each convex portion 21, 21 of the one retainer element 8 are brought into contact with each other. In this state, a gap 23 is formed between the inner side surface 19 and a portion of the opposing side surface portion 20 of the one cage element 8 other than the convex portions 21 and 21. In the case of this example, the outer peripheral surface of the large-diameter portion 18 of each rivet 9 and the inner peripheral surface of each through-hole 12a are fitted in a state where no clearance exists over the entire periphery.
Next, nitriding is performed on the intermediate assembly 17b configured as described above. On the other hand, of the two cage elements 8 and 8, the other cage element 8 is subjected to nitriding in a single state.

  In the case of this example, a nitride layer is formed on the entire surface of the other cage element 8. On the other hand, the intermediate assembly 17b is fitted with the inner peripheral surface of each through-hole 12a and the outer peripheral surface of the large-diameter portion 18 of each rivet 9 over the entire circumference without any gaps. The nitride layer is not formed on the portion. On the other hand, the convex portions of the opposing side surface portion 20 of the one cage element 8 other than the convex portions 21 and 21 and the inner side surface 19 of the head portion 15 of the rivets 9. Since the gap 23 is formed in a portion other than the portion in contact with the front end surface 22 of the portions 21 and 21, a nitride layer is formed.

  Next, in a state in which the flat plate portion 11 of one cage element 8 constituting the intermediate assembly 17b and the flat plate portion 11 of the other cage element 8 are overlapped {see FIG. 24 (b)}, both of these holders are held. Each ball 6 (see FIG. 20) is sandwiched between the inner surfaces of the curved plate portions 10 and 10 of the vessel elements 8 and 8. In this state, the retainer elements 8 and 8 are coupled and fixed to each other by caulking the tip of each rivet 9 (forming the caulking portion 14). In this caulking operation, the convex portions 21 and 21 formed on the one retainer element 8 are crushed by the inner side surface 19 of the head portion 15 of the rivet 9. For this reason, in the state after the caulking portion 14 is formed, the above-described existing side surface portion 20 of the one retainer element 8 and the inner side surface 19 of the head portion 15 of each rivet 9 are present. The gap 23 disappears, and the state as shown in FIG. 4, that is, the opposed side surface portion 20 and the inner side surface 19 are in contact with each other over the entire circumference.

According to this example as described above, even when the surface hardening treatment is performed in the state of the intermediate assembly 17b in which each of the rivets 9 is assembled to the one cage element 8, the outside of the one cage element 8 is removed. By forming a hardened surface layer on the side surface of the rivet 9 facing the inner side surface 19 of the head 15, a corrugated cage having excellent durability can be obtained.
That is, in the case of this example, the head 15 of each rivet 9 is formed around each through-hole 12a on the outer surface of the one cage element 8 before the caulking portion 14 is formed. The convex portions 21 and 21 are formed on the opposing side surface portion 20 facing the inner side surface 19. For this reason, in the state of the intermediate assembly 17b configured by combining the one cage element 8 and the rivets 9, portions of the opposing side surface portion 20 other than the convex portions 21, 21; The gap 23 can be provided between the inner surface 19 of the head 15. As a result, even when nitriding is performed in the state of such an intermediate assembly 17b, a nitride layer is formed on portions of the opposing side surface portion 20 of the one cage element 8 other than the convex portions 21 and 21. Can be formed. Accordingly, the strength of the opposing side surface portion 20 of the one cage element 8 is ensured, and when the caulking portion 14 is formed, the opposing side surface portion 20 is prevented from being depressed, thereby maintaining the durability of the cage. Can be secured.

[Second Example of Embodiment]
5 to 7 show a second example of the embodiment of the present invention. In the case of this example, the shape of the convex portions 21a, 21a formed on the opposing side surface portion 20 of one cage element 8 is different from that of the first example of the embodiment described above.
Specifically, in the case of this example, each of the convex portions 21a and 21a has a triangular prism shape whose height dimension is the highest at a position closest to each through hole 12a and decreases as the distance from each through hole 12a increases. Is formed. In the case of this example as well, the position and number of the convex portions 21a and 21a are not limited to those shown in FIG. For example, it can also be formed in a state as shown in FIGS.

  According to the present example as described above, the rigidity in the thickness direction of the one cage element 8 of each of the convex portions 21a and 21a can be reduced. For this reason, in the caulking operation, the convex portions 21a and 21a can be easily crushed by the inner surface 19 of the head 15 of the rivets 9 and 9. Other configurations and operations / effects are substantially the same as those in the first example of the embodiment described above.

[Third example of embodiment]
8 to 10 show a third example of the embodiment of the present invention. Also in this example, the shape of the convex portions 21b and 21b formed on the opposing side surface portion 20 of one cage element 8 is different from that of the first example of the above-described embodiment.
Specifically, in the case of this example, each of the convex portions 21b and 21b is formed in a triangular pyramid shape whose apex exists at a position closest to each through hole 12a. In the case of this example as well, the positions and number of the projections 21b, 21b are not limited to those shown in FIG. For example, it can be formed in a state as shown in FIGS.
According to the present example as described above, the rigidity in the thickness direction of the one retainer element 8 of each of the convex portions 21b and 21b is made lower than in the second example of the above-described embodiment. Can do. Other configurations, operations, and effects are substantially the same as those in the second example of the above-described embodiment.

[Fourth Example of Embodiment]
11 to 12 show a fourth example of the embodiment of the present invention. The feature of this example is that the shape of each through hole 12b of one of the cage elements 8 of the pair of cage elements 8 and 8 constituting the cage is devised.
In the case of this example, the inner peripheral surface of each through hole 12b formed in each flat plate portion 11 of the one retainer element 8 has an uneven surface extending in the circumferential direction of this through hole 12b as shown in FIG. A female spline 24 is formed. Of the female spline 24, the inner diameter dimension (inscribed circle diameter) d ₂₅ of the convex portions 25, ₂₅ is slightly smaller than the outer diameter dimension D ₁₈ of the large diameter portion 18 of the flange portion 13 of each rivet 9. It is made small (d ₂₅ <D ₁₈ ). In addition, the front end surface of each said convex parts 25 and 25 is a partial cylindrical concave surface which can be fitted to the large diameter part 18 of the collar part 13 of each said rivet 9 by interference fitting.

Meanwhile, the inside diameter (inscribed circle _{diameter) d 26} of the bottom of the recess 26 of the female spline 24 is larger than the outer diameter _{D 18} of the large-diameter portion _{18 (d 26> D 18)} .
Therefore, in a state where the large-diameter portion 18 of each rivet 9 is press-fitted inside each convex portion 25, 25 of each female spline 24, the concave portions 26, 26 of the female spline 24, and the respective concave portions 26, 26 Gaps 27 and 27 are formed between the outer peripheral surfaces of the large-diameter portions 18 of the opposing rivets 9.
In the case of this example, each through-hole 12 of the other retainer element 8 out of the retainer elements 8 and 8 is formed in a circular shape as in the conventional structure and the structure of the previous invention.

  Further, in the case of this example, among the opposing side surface portions 20a of the one retainer element 8 (the portion facing the inner side surface 19 of the head 15 of each rivet 9 and the portion indicated by the oblique lattice in FIG. 11), Convex portions 21 and 21 are formed at two positions opposite to each other in the radial direction of each through hole 12b. In the case of this example, the shape of each of the convex portions 21 and 21 is the same as that of the first example of the embodiment described above. However, the shape of each of the convex portions 21 and 21 can be formed in the same shape as the convex portions 21a and 21b of the second example or the third example of the embodiment described above. Further, the positions and number of the convex portions 21 and 21 are not limited to those shown in FIG.

In the manufacturing method of the waveform holder of the present example having the above-described configuration, first, the intermediate assembly 17c shown in FIG. 12A is assembled as in the case of the first example of the embodiment described above. Specifically, the head 15 of each rivet 9 is arranged outside one of the cage elements 8, 8 (upper side in FIG. 12), and the large-diameter portion 18 is These are fitted inside the convex portions 25, 25 of the female spline 24 of each through hole 12b. In this state, the gaps 27 and 27 are formed between the recesses 26 and 26 of the female splines 24 and the outer peripheral surface of the large-diameter portion 18 of the rivet 9 facing the recesses 26 and 26. Is formed. Further, the inner side surface 19 of the head portion 15 of each rivet 9 and the tip surface 22 of each convex portion 21, 21 of the one retainer element 8 come into contact with each other, and the inner side surface 19 and one of the holding surfaces thereof are held. A gap 23 is formed between the opposing side surface portion 20 of the vessel element 8 and the portions other than the convex portions 21, 21.
Next, nitriding is performed on the intermediate assembly 17c configured as described above. On the other hand, of the two cage elements 8 and 8, the other cage element 8 is subjected to nitriding in a single state.

  In the case of this example, a nitride layer is formed on the entire surface of the other cage element 8. On the other hand, in the intermediate assembly 17c, the convex portions 25, 25 of the female splines 24 and the large-diameter portions 18 of the rivets 9 are fitted, so that a nitride layer is formed in the portion. Not. The gaps 27 are formed between the recesses 26 and 26 of the female spline 24 of the through holes 12b and the outer peripheral surface of the large-diameter portion 18 of the rivet 9 facing the recesses 26 and 26. 27 are formed, a nitride layer is formed in this portion. Furthermore, among the opposing side surface portions 20a of the one retainer element 8, the portions other than the convex portions 21 and 21 and the inner side surface 19 of the head portion 15 of the rivets 9 have the convex portions 21, A nitrided layer is also formed in a portion other than the portion in contact with the tip surface 22 of 21.

  Next, in a state in which the flat plate portion 11 of one cage element 8 and the flat plate portion 11 of the other cage element 8 constituting the intermediate assembly 17c are overlapped {see FIG. Each ball 6 (see FIG. 20) is sandwiched between the inner surfaces of the curved plate portions 10 and 10 of the vessel elements 8 and 8. In this state, the retainer elements 8 and 8 are coupled and fixed to each other by caulking the tips of the rivets 9. In this caulking operation, the convex portions 21 and 21 formed on the one retainer element 8 are crushed by the inner side surface 19 of the head portion 15 of the rivet 9. For this reason, in the state after the caulking portion 14 is formed, the above-described existing side surface portion 20 of the one retainer element 8 and the inner side surface 19 of the head portion 15 of each rivet 9 are present. The gap 23 disappears.

According to this example as described above, even when nitriding is performed in a state where the rivets 9 are assembled to the one cage element 8 (in the state of the intermediate assembly 17c), the one cage element 8 A nitride layer is formed on the inner peripheral surface of each through-hole 12b and a part of the outer peripheral surface of the large-diameter portion 18 of each rivet 9, so that a structure with excellent durability can be realized.
That is, in the case of this example, a cylindrical large diameter portion 18 is provided in the flange portion 13 of each rivet 9, and the female spline 24 is provided on the inner peripheral surface of each through hole 12b of the one cage element 8. Forming. Therefore, in the state of the intermediate assembly 17c configured by fitting the large diameter portion 18 of each rivet 9 inside each convex portion 25, 25 of this female spline 24, each of the female spline 24 The gaps 27 and 27 can be provided between the recesses 26 and 26 and the outer peripheral surface of the large-diameter portion 18 of the rivet 9 facing the recesses 26 and 26. As a result, even when nitriding is performed in the state of the intermediate assembly 17c, the recesses 26 and 26 of the female spline and the outer peripheral surface of the large-diameter portion 18 facing the recesses 26 and 26, A nitride layer can be formed. Therefore, the strength of the inner peripheral surface of each through-hole 12b of the one retainer element 8 and the outer peripheral surface of the large-diameter portion 18 of each rivet 9 can be ensured to ensure the durability of the retainer.

  In the case of this example, a nitride layer can be formed on the inner peripheral surface of each through hole 12 b of the one retainer element 8 and a part of the large diameter portion 18 of each rivet 9. For this reason, the intensity | strength of the said part does not become remarkably lower than another part. As a result, when the tip of each rivet 9 is crimped, the outer diameter of the large-diameter portion 18 is prevented from expanding more than other portions, and is present on the outer-diameter side of the large-diameter portion 18. It is possible to prevent cracks from occurring on the inner peripheral surface of each through-hole 12b.

[Fifth Example of Embodiment]
FIG. 13 shows a fifth example of the embodiment of the present invention. In the case of this example, the inner peripheral surface of each through-hole 12a of one retainer element 8 among the retainer elements 8 and 8 constituting the retainer is a cylindrical surface. On the other hand, a male spline 28, which is an uneven surface extending in the circumferential direction, is formed near the head 15 (see FIG. 12) of each rivet 9. Of the male spline 28, the outer diameter dimension (circumscribed circle diameter) D ₂₉ of the convex portions 29, ₂₉ is larger than the inner diameter dimension d _12a of the inner peripheral surface of each through hole 12a of the one retainer element 8. Is slightly larger (D ₂₉ > d _12a ). In addition, the front end surface of each said convex parts 29 and 29 is a partial cylindrical convex surface which can be fitted to the inner peripheral surface of each said through-hole 12a by interference fitting.

On the other hand, the outer diameter dimension (circumscribed circle _{diameter) D 30} of the bottom of the recess 30, 30 of the male spline 28 is smaller than the inner diameter _{d 12a} of the inner peripheral surface of each through hole 12a of the one retainer element 8 _(D 30 _{<d 12a).}
Accordingly, the concave portions 30 and 30 of the male spline 28 and the concave portions 30 and 30 of the male spline 28 in a state where the convex portions 29 and 29 of the male spline 28 are press-fitted inside the through holes 12a of the one retainer element 8. , 30 and gaps 31, 31 are formed between the inner peripheral surfaces of the through holes 12a facing each other.
In the case of this example, as in the case of the first example of the embodiment described above, the opposing side surface portion 20 of the one retainer element 8 (the portion facing the inner side surface 19 of the head 15 of each rivet 9). ), Convex portions 21 and 21 are formed at two positions opposite to each other in the radial direction of each through hole 12a. Other configurations and operations / effects are the same as those in the first and fourth examples of the embodiment described above.

[Sixth Example of Embodiment]
FIG. 14 shows a sixth example of the embodiment of the present invention. In the case of this example, each of the through holes 12 c formed in each flat plate portion 11 of one of the cage elements 8, 8 has an elliptical shape that is long in the radial direction of the cage element 8. . Further, the length _{d 1} of the minor axis of each through hole 12c is slightly smaller than the outer diameter _{D 18} of the large diameter portion 18 of the rod portion 13 of each rivet 9 _(d 1 _{<D 18} ). In the case of this example, the inner circumferential surface of each through-hole 12c is configured by a range that is shifted by a predetermined angle (about 15 degrees) on both sides in the circumferential direction around the portion intersecting the minor axis. The arc-shaped portions are the fitting portions 32 and 32 that can be fitted with the large-diameter portion 18 in a state having a tightening allowance.

Further, the length _{d 2} of the long axis of the respective through holes 12c, the greater than the outer diameter _{D 18} of the large diameter portion 18 of the rod portion 13 of each rivet _{9 (d 2> D 18)} . In the case of this example, the inner diameter of the remaining part of the inner peripheral surface of each through hole 12c other than the fitting parts 32, 32 is the outer diameter D ₁₈ of the large diameter part 18 of each rivet 9. It is set as the non-fitting part 33 and 33 larger than this. That is, in a state in which the large-diameter portion 18 of each rivet 9 is press-fitted into each fitting portion 32, 32 of each through-hole 12c, each non-fitting portion 33, 33 and the large-diameter portion of each rivet 9 Clearances 34, 34 are formed between the outer peripheral surfaces of 18.
In the case of this example, each through-hole 12 of the other cage element 8 (see FIG. 24) of the cage elements 8, 8 has the above-described conventional structure, the structure of the prior invention, and the embodiment. Like the structure of each example, it is formed in a circular shape.

  In the case of this example, the opposing side surface portion 20b of one cage element 8 {the portion facing the inner side surface 19 of the head portion 15 of the rivet 9 (see FIG. 24), the portion indicated by the oblique lattice in FIG. 14} Among them, convex portions 21 and 21 are formed at two positions opposite to each other in the minor axis direction in the middle portion of each through hole 12c in the major axis direction. In addition, the shape of each of these convex parts 21 and 21 is the same as that of the case of the 1st example of embodiment mentioned above. Further, the positions and the number of the projections 21 and 21 are not limited to those shown in FIG.

The manufacturing method of the waveform holder of this example having the above-described configuration will be described with reference to FIGS.
First, the intermediate assembly 17a shown in FIG. 24 (a) is assembled in the same manner as the previous invention and the examples of the embodiment. Specifically, the head 15 of each rivet 9 is disposed outside one of the cage elements 8, 8, and the large diameter portion 18 is connected to each through-hole 12 c. It fits in each fitting part 32,32. In this state, the gaps 34 and 34 are formed between the non-fitting portions 33 and 33 of the through holes 12 c and the outer peripheral surface of the large-diameter portion 18 of the rivets 9. Further, the inner side surface 19 of the head portion 15 of each rivet 9 and the tip surface 22 of each convex portion 21, 21 of the one retainer element 8 come into contact with each other, and the inner side surface 19 and one of the holding surfaces thereof are held. A gap 23 (see FIG. 1) is formed between the opposing side surface portion 20b of the vessel element 8 and portions other than the convex portions 21 and 21.
Next, nitriding treatment is performed on the intermediate assembly 17a configured as described above. On the other hand, of the two cage elements 8 and 8, the other cage element 8 is subjected to nitriding in a single state.

  In the case of this example, the other cage element 8 has a nitride layer formed on the entire surface thereof. On the other hand, the intermediate assembly 17a has the fitting portions 32 and 32 of the through holes 12c and a part of the circumferential direction of the large-diameter portion 18 of the rivets 9 fitted therein. The nitride layer is not formed. Further, since the gaps 34, 34 are formed between the non-fitting portions 33, 33 of the through holes 12c and the outer peripheral surface of the large diameter portion 18 of the rivets 9, A nitride layer is formed. Furthermore, among the opposing side surface portions 20b of the one cage element 8, the portions other than the convex portions 21 and 21 and the inner side surface 19 of the head portion 15 of the rivets 9, the convex portions 21, A nitrided layer is also formed in a portion other than the portion in contact with the tip surface 22 of 21.

  Next, as shown in FIG. 24 (b), in a state where the flat plate portion 11 of one cage element 8 and the flat plate portion 11 of the other cage element 8 constituting the intermediate assembly 17a are overlapped, Each ball 6 (see FIG. 20) is sandwiched between the inner surfaces of the curved plate portions 10 and 10 of both cage elements 8 and 8. In this state, the retainer elements 8 and 8 are coupled and fixed to each other by caulking the tips of the rivets 9. In this caulking operation, each rivet 9 receives an axial pressing force and expands radially outward inside the through holes 12c, 12 of both the cage elements 8, 8. The plastic deformation occurs. As the rivets 9 are plastically deformed in this manner, gaps existing between the outer peripheral surfaces of the rivets 9 and the inner peripheral surfaces of the through holes 12c and 12 including the gaps 34 and 34 are formed. Disappear. As a result, both the cage elements 8, 8 and the rivets 9 are fixed without rattling. Also in this example, as in the case of each example of the above-described embodiment, during the caulking operation, each convex portion 21, 21 formed on the one retainer element 8 is replaced with each rivet 9. , 9 are crushed by the inner surface 19 of the head 15. For this reason, in a state after the caulking portion 14 (see FIG. 23) is formed, it is between the opposing side surface portion 20b of the one retainer element 8 and the inner side surface 19 of the head portion 15 of each of the rivets 9 and 9. The gap 23 that existed in the area disappears.

According to this example as described above, even when nitriding is performed in a state where the rivets 9 are assembled to the one retainer element 8 (the state of the intermediate assembly 17a), the one retainer element 8 A nitride layer is formed on the inner peripheral surface of each through-hole 12c and a part of the large-diameter portion 18 of each rivet 9, so that a structure with excellent durability can be realized.
That is, in the case of this example, each rivet 9 is provided with a large-diameter portion 18, and each fitting portion 32, 32 and each non-removal portion are formed on the inner peripheral surface of each through-hole 12 c of the one cage element 8. The fitting parts 33 and 33 are provided. For this reason, in the state of the intermediate assembly 17a configured by fitting the large-diameter portion 18 of the rivet 9 to the fitting portions 32, 32, the non-fitting portions 33, 33, The gaps 34 and 34 can be provided between the outer peripheral surfaces of the large-diameter portions 18 of the rivets 9. As a result, even when nitriding is performed in the state of the intermediate assembly 17a, the non-fitting portions 33 and 33 and the large-diameter portion 18 facing the non-fitting portions 33 and 33 are provided. A nitride layer can be formed on the outer peripheral surface. Therefore, the strength of the inner peripheral surface of each through-hole 12c of the one retainer element 8 and the outer peripheral surface of the large-diameter portion 18 of each rivet 9 can be ensured to ensure the durability of the retainer. Other configurations and operations / effects are the same as those in the first and fourth examples of the embodiment described above.

[Seventh example of embodiment]
FIG. 15 shows a seventh example of the embodiment of the invention. In the case of this example, the shape of the through hole 12 d of one of the cage elements 8, 8 constituting the cage is an elliptical shape that is long in the circumferential direction of the cage element 8. In other words, in the case of the present invention, the shape of the through hole 12d of one of the cage elements 8 and the position where the convex portions 21 and 21 are formed are rotated by 90 degrees with respect to the through hole 12c of the sixth example of the above-described embodiment. It has a shape as shown. About the structure of another part, an effect | action, and an effect, it is substantially the same as the case of the 1st example and 6th example of embodiment mentioned above.

[Eighth Example of Embodiment]
FIG. 16 shows an eighth example of the embodiment of the present invention. In the case of this example, the shape of the through-hole 12e of one retainer element 8 out of both retainer elements 8 and 8 constituting the retainer is a substantially square shape in which corner R portions are formed at four corners.
In the case of this example, the distance H ₁ between the inner surfaces facing each other in the radial direction (vertical direction in FIG. 16) of the one retainer element 8 among the inner surfaces constituting each through-hole 12e, and the distance of H ₂ inner surfaces facing each other in the circumferential direction (lateral direction in FIG. 16) are slightly smaller than the outer diameter D ₁₈ of the large diameter portion 18 of the rod portion 13 of each rivet 9 (H ₁ <D ₁₈ , H ₂ <D ₁₈ ). And in the case of this example, the center part of each inner surface of each said through-hole 12e is made into the fitting parts 32a and 32a which can be fitted in the state which has the interference diameter with the said large diameter part 18. As shown in FIG.

On the other hand, the remaining portions other than the fitting portions 32a and 32a on the inner side surfaces of the through holes 12e are non-fitting portions 33a and 33a. That is, in a state where the large-diameter portion 18 of each rivet 9 is press-fitted into the fitting portions 32a and 32a of each through-hole 12e, the non-fitting portions 33a and 33a and the large-diameter portion 18 of each rivet 9 are pressed. Clearances 34a, 34a are formed between the outer peripheral surfaces of the two.
Further, in the case of this example, among the opposing side surface portions 20d of the one retainer element 8 (the portion facing the inner side surface 19 of the head 15 of each rivet 9 and the portion indicated by the oblique lattice in FIG. 16), Convex portions 21 and 21 are formed at two positions facing each other in the radial direction of one cage element 8. Note that the positions and the number of the projections 21 and 21 are not limited to those shown in FIG. About the structure of another part, an effect | action, and an effect, it is substantially the same as the case of the 1st example and 6th example of embodiment mentioned above.

[Ninth Embodiment]
FIG. 17 shows a ninth example of the embodiment of the invention. In the case of this example, the shape of the through hole 12f of one of the cage elements 8 and 8 constituting the cage is a substantially rhombus shape in which corner R portions are formed at the four corners. In other words, in the case of this example, the shape of the through-hole 12f of one cage element 8 and the positions where the convex portions 21 and 21 are formed are 45 degrees compared to the case of the eighth example of the above-described embodiment. It is rotating. About the structure of another part, an effect | action, and an effect, it is substantially the same as the case of the 1st example and 6th example of embodiment mentioned above.

[Tenth example of embodiment]
FIG. 18 shows a tenth example of the embodiment of the present invention. In the case of this example, the shape of the through hole 12g of one of the cage elements 8 out of the two cage elements 8 and 8 constituting the cage is a hexagonal shape.
In the case of this example, the distance H ₃ between the opposing inner surfaces among the inner surfaces constituting each through hole 12g is set to the outer diameter D ₁₈ of the large diameter portion 18 of the flange portion 13 of each rivet 9. (H ₃ <D ₁₈ ). And in the case of this example, the center part of each inner surface of each said through-hole 12c is made into the fitting parts 32b and 32b which can be fitted in the state which has the interference diameter with the said large diameter part 18. As shown in FIG.
On the other hand, the remaining portions other than the fitting portions 32b and 32b in the inner surface of the through holes 12g are set as non-fitting portions 33b and 33b. That is, in a state where the large diameter portion 18 of each rivet 9 is press-fitted into the fitting portions 32b, 32b of each through hole 12g, each non-fitting portion 33b, 33b and the large diameter portion 18 of each rivet 9 are pressed. Clearances 34b and 34b are formed between the outer peripheral surfaces of the two.

  Further, in the case of this example, among the opposing side surface portions 20f of the one cage element 8 (the portion facing the inner side surface 19 of the head 15 of each rivet 9 and the portion shown by the oblique lattice in FIG. 18), Convex portions 21 and 21 are formed at two positions opposite to each other in the radial direction of one cage element 8. Note that the positions and the number of the projections 21 and 21 are not limited to those shown in FIG. About the structure of another part, an effect | action, and an effect, it is substantially the same as that of the 1st example and 6th case of embodiment mentioned above.

[Eleventh example of embodiment]
FIG. 19 shows an eleventh example of the embodiment of the present invention. Also in the case of this example, the shape of the through hole 12h of one of the cage elements 8 and 8 constituting the cage is a hexagonal shape. However, in the case of this example, the shape of the through-hole 12h of one cage element 8 and the position where the convex portions 21 and 21 are formed are rotated by 30 degrees compared to the case of the tenth example of the above-described embodiment. I am letting. About the structure of another part, an effect | action, and an effect, it is substantially the same as the case of the 1st example and 6th example of embodiment mentioned above.

When practicing the present invention, the position and the number of convex portions formed on the opposing side surface portion of one of the cages are not limited to the above examples of the embodiment. In addition, the structures of the examples of the above-described embodiments can be implemented in appropriate combination.
Further, the corrugated cage manufacturing method and corrugated cage of the present invention are not limited to the general corrugated cage described above, and only one of the opening widths at both ends of each pocket is in the inside of each pocket. The present invention can be implemented for various corrugated cages including a structure in which the diameter of the ball to be held is smaller and the other opening width is larger than the diameter of each ball.

DESCRIPTION OF SYMBOLS 1 Ball bearing 2 Inner ring raceway 3 Inner ring 4 Outer raceway 5 Outer ring 6 Ball 7 Cage 8 Cage element 9 Rivet 10 Curved plate part 11 Flat plate part 12, 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h Through-hole 13 collar part 14 caulking part 15 head part 16 pocket 17, 17a, 17b, 17c intermediate assembly 18 large diameter part 19 inner side surface 20, 20a, 20b, 20c, 20d, 20e, 20f opposing side surface part 21, 21a, 21b convex Portion 22 Front end surface 23 Clearance 24 Female spline 25 Convex 26 Concave 27 Clearance 28 Male spline 29 Convex 30 Concave 31 Clearance 32, 32a, 32b Fitting 33, 33a, 33b Non-fitting 34, 34a, 34b Clearance 35 Nitride layer

Claims (2)

A pair of retainer elements and a plurality of rivets;
Both of these cage elements are each made of a metal plate into a corrugated annular shape, with partial spherical curved plate portions at multiple locations in the circumferential direction, and between adjacent curved plate portions in the circumferential direction. A flat plate portion is provided in between, a through hole is provided in a part of each flat plate portion,
Each of the rivets is made of metal, and includes a flange portion and a head portion having a diameter larger than that of the flange portion provided at a proximal end portion of the flange portion,
The flat plate portions of the two cage elements are overlapped with each other, and the tip portions of the hook portions are crushed in a state where the hook portions of the rivets are inserted into the through holes of the flat plate portions overlapped with each other. The caulking portions having a diameter larger than those of the flange portions are joined together by sandwiching the flat plate portions overlapped with each other between the head portion and the caulking portion of each rivet, A method of manufacturing a corrugated cage, wherein the portion surrounded by the portion is a pocket for holding each ball so as to freely roll,
Before the caulking portion is formed, the outer surface of one of the cage elements is opposed to the inner side surface of the head of the rivet around the through hole. A convex portion is formed at least at one position on the opposite side surface portion,
By press-fitting the flange portion of the rivet into the through hole of the one retainer element until the inner side surface of the head and the convex portion come into contact with each other, other than the convex portion of the opposing side surface portion. Constituting an intermediate assembly in which a gap is formed between the portion and the inner surface of the head;
A surface hardening treatment is performed on the intermediate assembly, and the other one of the cage elements is subjected to a surface hardening treatment as it is,
Of the rivet of each rivet constituting the intermediate assembly, a portion protruding from each through hole of the one retainer element is inserted into each through hole of the other retainer element, and A method of manufacturing a corrugated cage, characterized in that, in a state in which flat plate portions are overlapped with each other, the convex portion is crushed by the head portion, and the caulking portion is formed at a distal end portion of the flange portion. A pair of retainer elements and a plurality of rivets;
Both of these cage elements are each made of a metal plate into a corrugated annular shape, with partial spherical curved plate portions at multiple locations in the circumferential direction, and between adjacent curved plate portions in the circumferential direction. A flat plate portion is provided in between, a through hole is provided in a part of each flat plate portion,
Each of the rivets is made of metal, and includes a flange portion and a head portion having a diameter larger than that of the flange portion provided at a proximal end portion of the flange portion,
The inner side surfaces of the flat plate portions of the two retainer elements are butted against each other, and the leading end portions of the rib portions are inserted into the through holes of the flat plate portions butted with the rib portions of the rivets. Crushing to form a caulking portion having a diameter larger than each of the flange portions, and joining the flat plate portions that are butted against each other by sandwiching the head portion and the caulking portion of each rivet, A corrugated cage in which a portion surrounded by a plate portion is a pocket for holding a ball so as to roll freely, and is in a state before the caulking portion is formed. A convex portion is formed at the position of at least one of the opposing side surfaces facing the inner side surface of the head of the rivet around each through-hole of the outer surface of the cage element,
Each of the rivets and the one retainer element are press-fitted into the through hole of the one retainer element until the inner surface of the head and the convex portion are in contact with each other. The surface hardening treatment is performed in a state of an intermediate assembly in which a gap is formed between a portion other than the convex portion of the opposed side surface portion and the inner surface of the head portion,
Of the two cage elements, the other cage element has been subjected to surface hardening treatment as it is,
Of the rivet of each rivet constituting the intermediate assembly, a portion protruding from each through hole of the one retainer element is inserted into each through hole of the other retainer element, and A waveform holder, wherein the convex portions are crushed by the head in a state where the flat plate portions are overlapped to form the caulking portion.

Images