JP2015045371A - Manufacturing method of corrugated cage and corrugated cage - Google Patents

Manufacturing method of corrugated cage and corrugated cage Download PDF

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JP2015045371A
JP2015045371A JP2013176651A JP2013176651A JP2015045371A JP 2015045371 A JP2015045371 A JP 2015045371A JP 2013176651 A JP2013176651 A JP 2013176651A JP 2013176651 A JP2013176651 A JP 2013176651A JP 2015045371 A JP2015045371 A JP 2015045371A
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portions
cage
rivets
rivet
flat plate
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山本　寿人
Hisato Yamamoto
寿人 山本
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/42—Ball cages made from wire or sheet metal strips
    • F16C33/422—Ball cages made from wire or sheet metal strips made from sheet metal
    • F16C33/427—Ball cages made from wire or sheet metal strips made from sheet metal from two parts, e.g. ribbon cages with two corrugated annular parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a structure which is excellent in durability even if applied with nitriding treatment in a state where rivets 9 are assembled into one cage element 8 by forming nitrided layers at an internal peripheral face of a penetration hole 12a of the cage element 8 and at a part of a large-diameter part 18 of each rivet 9.SOLUTION: A female spline 19 is formed at an internal peripheral face of each penetration hole 12a of the one cage element 8. On the other hand, the cylindrical large-diameter part 18 is formed at a portion shifted to a head part 15 of a rod part 13 of each rivet 9. Then, nitriding treatment is applied to an intermediate assembled body in a state where the intermediate assembled body is constituted by pressure-inserting the large-diameter part 18 of each rivet 9 to the inside of each protrusion 20 of each female spline 19. On the other hand, nitriding treatment is applied to the other cage element as the element is left as a single body. Then, in a state where the other cage element is assembled into the intermediate assembled body, a caulked part is formed at a tip of each rivet 9.

Description

この発明は、ラジアル玉軸受等、自動車のトランスミッション、カーエアコン用コンプレッサ等の自動車用補機、或いは、一般産業用の各種機械等の回転支持部分に組み込まれる各種転がり軸受を構成する、玉を保持する波形保持器の製造方法及び波形保持器の構造の改良に関する。   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.

各種機械装置の回転支持部に組み込む転がり軸受として、例えば図４に示す様な単列深溝型の玉軸受１が、広く使用されている。この玉軸受１は、外周面に内輪軌道２を有する内輪３と、内周面に外輪軌道４を有する外輪５と、これら内輪軌道２と外輪軌道４との間に転動自在に設けられた複数個の玉６と、これら各玉６を転動自在に保持する保持器７とを備える。   For example, a single-row deep groove type ball bearing 1 as shown in FIG. 4 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.

このうちの保持器７は、例えば特許文献１〜５に記載されている様な、波形保持器と呼ばれるもので、図５、７に示す様に、１対の保持器素子８、８を複数本のリベット９、９により接合して成る。これら両保持器素子８、８は、鋼板、ステンレス鋼板等の金属板製の素材に、プレスによる打ち抜き加工及び曲げ加工を施す事により、全体を波形の円環状に造られている。この様な両保持器素子８、８は、円周方向複数箇所に部分球面状の曲板部１０、１０を、円周方向に隣り合う曲板部１０、１０同士の間に平板部１１、１１を、これら各平板部１１、１１の中央部に貫通孔１２、１２を、それぞれ備える。又、前記各リベット９、９は、鋼、ステンレス鋼等の金属製で、杆部１３と、この杆部１３の基端部に設けられた頭部１５とを備える。   Among these, the retainer 7 is called a waveform retainer as described in, for example, Patent Documents 1 to 5, and a plurality of pairs of retainer elements 8 and 8 are provided 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.

前記保持器７は、前記両保持器素子８、８の各平板部１１、１１の同士を互いに重ね合わせると共に、これら各平板部１１、１１の互いに整合する位置に形成した前記各貫通孔１２、１２に前記リベット９、９の杆部１３を挿通した状態で、これら各杆部１３の先端部を押し潰してかしめ部１４を形成し、互いに重ね合わせた前記各平板部１１、１１同士を、前記各リベット９、９の頭部１５とかしめ部１４とで挟持する事により接合している。そして、この状態で、前記各曲板部１０、１０に囲まれた部分を、それぞれ前記各玉６を転動自在に保持する為のポケット１６、１６としている。   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.

上述の様な保持器７を備えた玉軸受１は、例えば、冷媒圧縮用のスクロール型コンプレッサの可動スクロールにその一端部を連結された回転軸の他端部等の回転支持部分に組み込まれて、前記内輪３と前記外輪５とが偏心或いは傾斜した状況下で使用される場合がある。この様な場合には、運転中、前記各玉６から前記保持器７に、これら各玉６の公転速度の相違等に起因して、大きな力が作用する可能性がある為、この様な場合には、この保持器７の耐久性を十分に確保しておく必要がある。具体的には、この保持器７を構成する、前記両保持器素子８、８及び前記各リベット９、９の強度を十分に確保しておく必要がある。これら各部材８、９の強度を向上させる方法としては、これら両保持器素子８、８の肉厚やこれら各リベット９、９の直径を大きくする方法があるが、寸法制約上、採用できない場合も少なくない。これに対し、前記各部材８、９の寸法変化を殆ど伴う事なく、同様の目的を達成できる方法として、これら各部材８、９の表面に窒化層（窒化処理による表面硬化層）を形成する方法が、特許文献２に記載される等により、従来から広く知られている。以下、この特許文献２に記載された発明に就いて、図６を参照しつつ説明する。   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, a nitrided layer (surface hardened 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 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.

前記特許文献２に記載された発明の場合、先ず、図６に示す様に、両保持器素子８、８の各平板部１１、１１の内側面同士を、隙間を介した状態で対向させると共に、これら各平板部１１、１１の互いに整合する部分に形成した貫通孔１２、１２に、前記各リベット９、９の杆部１３、１３を挿通して、中間組立体１７とする。尚、この中間組立体１７の状態で、これら各リベット９、９の杆部１３、１３の外周面と、これら各貫通孔１２、１２の内周面との間には隙間が設けられている。次いで、前記中間組立体１７に対して、窒化処理を施す。尚、窒化処理の方法に関しては、従来から行われている窒化処理の方法と同様であり、特許文献２にも記載されている為、説明は省略する。その後、前記両保持器素子８、８の各平板部１１、１１の内側面同士を突き合せた状態で、前記各リベット９、９の杆部１３、１３の先端部をかしめる（塑性変形させて前記かしめ部１４とする）事により、前記両保持器素子８、８同士を結合固定する。   In the case of the invention described in Patent Document 2, first, as shown in FIG. 6, 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.

この様な特許文献２に記載された発明の場合、図７に示す様に、前記両保持器素子８、８の表面、及び、前記リベット９、９の表面に窒化層２７を形成して、前記保持器７の耐久性の向上を図る事ができる。但し、前述の様な中間組立体１７の状態で、前記各リベット９、９は、前記各貫通孔１２、１２に対して軸方向の抜け止めを図られていない。この為、窒化処理を施す装置に前記中間組立体１７を組み込む際、或いは、窒化処理の際、前記リベット９、９が前記各貫通孔１２、１２から抜け落ちてしまう可能性がある。   In the case of the invention described in Patent Document 2 as described above, as shown in FIG. 7, a nitride layer 27 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.

尚、前記特許文献２には、前記両保持器素子８、８のうち、一方（図６の上方）の保持器素子８の各貫通孔１２、１２にのみ、前記各リベット９、９を挿通する事により構成した中間組立体、即ち、図６に示した中間組立体１７から他方（図６の下方）の保持器素子８を省略した中間組立体に対して、窒化処理を施すと共に、この他方の保持器素子８には、単体の状態で窒化処理を施した後、これら両保持器素子８、８同士を前記各リベット９、９により結合固定する発明も記載されている。しかしながら、この様な発明の場合も、上述した発明の場合と同様の問題、即ち、窒化処理の際に、前記各リベット９、９が前記各貫通孔１２、１２から抜け落ちる可能性があると言った問題を有している。   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 and 8 (upper side in FIG. 6). The intermediate assembly constructed by doing this, that is, the intermediate assembly in which the other retainer element 8 (lower side in FIG. 6) 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.

又、特許文献２には、前記両保持器素子８、８及び前記各リベット９、９に対して、それぞれ単体の状態で窒化処理を施す事に就いても記載されている。但し、前記各リベット９、９に、単体の状態で窒化処理を施す場合、これら各リベット９、９は非常に小さい部品であり、これら各リベット９、９の全表面に窒化処理を施す為には、窒化処理の工程で面倒な作業、及び、特別な装置（治具等）が必要になる場合がある。具体的には、前記各リベット９、９の様な小さい部品に窒化処理を施す場合、これら各リベット９、９を、かご等にまとめて入れた状態で窒化処理を施す事が考えられる。しかしながら、この様な状態でこれら各リベット９、９に窒化処理を施すと、前記各リベット９、９同士が当接した（重なった）部分には、窒素が入りづらくなる。この結果、これら各リベット９、９のどの部分に表面硬化層が形成されたかを把握する事が困難となり、これら各リベット９、９の強度を安定して向上させられない可能性がある。これに対して、前記各リベット９、９を、これら各リベット９、９同士が当接しない様に整列させた状態で、窒化処理を施す場合、これら各リベット９、９を整列させる為の面倒な作業、及び、これら各リベット９、９が倒れる事を防止する為の治具等が必要になり、製造コストが嵩んでしまう。   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.

［先発明の説明］
そこで、本発明の発明者は、前記各リベット９、９の、前記各保持器素子８、８の各貫通孔１２、１２に対する抜け止めを図るべく、以下の様な発明をした。
以下、この先発明に就いて、図８を参照しつつ説明する。
この先発明の場合、前記かしめ部１４（図７参照）を形成する以前の状態で、前記各リベット９、９の杆部１３のうちの頭部１５寄り部分に大径部１８を設けている。この大径部１８は、その外径寸法Ｄ１８が、一方｛図８（ｂ）の上方｝の保持器素子８の各貫通孔１２の内径寸法ｄ１２よりも僅かに大きい（Ｄ１８＞ｄ８）。又、前記各リベット９、９の杆部１３のうちの前記大径部１８以外の部分の外径寸法Ｄ１３は、前記一方の保持器素子８の貫通孔の内径寸法ｄ８よりも小さい（Ｄ１３＜ｄ８）。尚、図８に示す構造の場合、他方の保持器素子８の各貫通孔１２の内径寸法は、前記一方の保持器素子８の各貫通孔１２の内径寸法と等しい。 [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, the large-diameter portion 18 is provided in the portion near the head portion 15 of the flange portion 13 of each of the rivets 9 and 9 before the caulking portion 14 (see FIG. 7) 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. 8B} (D 18 > d 8 ). Further, the outer diameter D 13 of the ridges 13 of the respective rivets 9 and 9 other than the large diameter portion 18 is smaller than the inner diameter d 8 of the through hole of the one cage element 8 ( D 13 <d 8 ). In the case of the structure shown in FIG. 8, the inner diameter of each through hole 12 of the other cage element 8 is equal to the inner diameter of each through hole 12 of the one retainer element 8.

この様な先発明の場合、図８（ａ）に示す様に、前記一方の保持器素子８の外側（図８の上側）に前記各リベット９の頭部１５を配置すると共に、前記大径部１８を、前記各貫通孔１２に内嵌した状態で、前記各リベット９を、前記一方の保持器素子８に仮止めする事により、中間組立体１７ａを構成している。次いで、この中間組立体１７ａに対して窒化処理を施す。一方、前記他方の保持器素子８には、単体の状態で窒化処理を施す。   In the case of such a prior invention, as shown in FIG. 8A, the heads 15 of the rivets 9 are arranged outside the one cage element 8 (upper side in FIG. 8), and the large diameter The intermediate assembly 17a is configured by temporarily fixing each rivet 9 to the one retainer element 8 with the portion 18 fitted in each through-hole 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.

従って、上述の様な先発明の場合、前記他方の保持器素子８は、その周面の全体に窒化層が形成される。一方、前記中間組立体１７ａは、前記各リベット９、９の大径部１８を、前記一方の保持器素子８の貫通孔１２に内嵌している。この為、この大径部１８及びこの大径部１８と当接している前記一方の保持器素子８の貫通孔１２の内周面部分には、窒化層が形成されない。尚、前記リベット９、９の頭部１５の内側面（図８の下面）と、前記一方の保持器素子８の外側面（図８の上面）とを当接させた場合には、当該部分にも窒化層は形成されない。一方、前記中間組立体１７ａの状態で、前記リベット９、９の頭部１５の内側面と、前記一方の保持器素子８の外側面との間に隙間を設けている場合には、前記リベット９、９の頭部１５の内側面と、前記一方の保持器素子８の外側面とが対向する部分にも窒化層が形成される。   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 and 9 is fitted in 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 that is in contact with the large diameter portion 18. When the inner surface (the lower surface in FIG. 8) of the head 15 of the rivets 9 and 9 and the outer surface (the upper surface in FIG. 8) of the one cage element 8 are brought into contact with each other, In addition, no nitride layer is formed. On the other hand, when a gap is provided between the inner surface of the head portion 15 of the rivets 9 and 9 and the outer surface of the one cage element 8 in the state of the intermediate assembly 17a, the rivet Nitride layers are also formed in portions where the inner side surfaces of the head portions 15 of 9, 9 and the outer side surfaces of the one cage element 8 face each other.

又、上述の様な先発明の場合、図８（ｂ）に示す様に、前記中間組立体１７ａの平板部１１と他方の保持器素子８の平板部１１とを重ね合わせた状態で、これら両保持器素子１７ａ、８の曲板部１０、１０の内面同士の間に前記各玉６（図４参照）を挟み込む。そして、この状態で、前記各リベット９、９の先端部をかしめる事により、これら両保持器素子８、８同士を結合固定する。
この様なかしめ作業の際、前記各リベット９、９の杆部１３は、その先端部側から軸方向への押圧力を受ける為、この杆部１３は、前記両保持器素子８、８の貫通孔１２、１２の内側で、外径寸法が大きくなる方向に膨張する様に塑性変形する。 In the case of the prior invention as described above, as shown in FIG. 8B, the flat plate portion 11 of the intermediate assembly 17a and the flat plate portion 11 of the other cage element 8 are overlapped with each other. The balls 6 (see FIG. 4) are sandwiched between the inner surfaces of the curved plate portions 10 and 10 of both the cage elements 17a 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.
In such a caulking operation, the flange portion 13 of each of the rivets 9 and 9 receives a pressing force in the axial direction from the tip end side thereof, so that the flange portion 13 is connected to the cage elements 8 and 8. Inside the through-holes 12, 12, plastic deformation is performed so as to expand in a direction in which the outer diameter dimension increases.

ところが、前記一方の保持器素子８の貫通孔１２の内周面、及び、前記各リベット９、９の大径部１８は、窒化層が形成されていない為、当該部分の強度が、他の部分よりも低い。この為、前記大径部１８は、他の部分よりも大きく膨張しようとする事が、発明者が行った実験により分かった。そして、この様な大径部１８の膨張に基づいて、この大径部１８の外径側に存在する前記一方の保持器素子８の貫通孔１２の内周面が強く押圧され、当該部分にひびや亀裂等が発生する可能性がある事も分かった。   However, since the inner peripheral surface of the through-hole 12 of the one cage element 8 and the large-diameter portion 18 of each of the rivets 9 and 9 are not formed with a nitride layer, the strength of the portion is other than Lower than part. For this reason, it has been found from experiments conducted by the inventors that the large diameter portion 18 tends to expand more than other portions. Based on the expansion of the large diameter portion 18, the inner peripheral surface of the through hole 12 of the one retainer element 8 existing on the outer diameter side of the large diameter portion 18 is strongly pressed, It was also found that cracks and cracks may occur.

特開平７−３０１２４２号公報JP-A-7-301242 特開平１０−２８１１６３号公報JP-A-10-281163 特開平１１−１７９４７５号公報JP-A-11-179475 特開２００９−８１６４号公報JP 2009-8164 A 特開２００９−２３６２２７号公報JP 2009-236227 A

本発明は、上述の様な事情に鑑みて、一方の保持器素子に複数のリベットを組み付けた中間組立体の状態で窒化処理を施した場合でも、この一方の保持器素子の貫通孔の内周面及びこれら各リベットの大径部の一部に窒化層を形成できて、耐久性に優れた波形保持器を得られる波形保持器の製造方法、及びこの様な波形保持器を実現すべく発明したものである。   In view of the circumstances as described above, the present invention is effective even when nitriding is performed in the state of an intermediate assembly in which a plurality of rivets are assembled to one cage element. A method for manufacturing a corrugated cage capable of forming a nitrided layer on the peripheral surface and a part of the large diameter portion of each rivet and obtaining a corrugated cage excellent in durability, and to realize such a corrugated cage Invented.

本発明の対象となる波形保持器は、１対の保持器素子と、複数のリベットとを備えている。
このうちの両保持器素子はそれぞれ、窒化処理可能な金属板により全体を波形の円環状に造られて、円周方向複数箇所に部分球面状の曲板部を、円周方向に隣り合う曲板部同士の間に平板部を、これら各平板部の一部に貫通孔を、それぞれ備えている。
又、前記各リベットはそれぞれ、窒化処理可能な金属製で、杆部と、この杆部の基端部に設けられた、この杆部よりも大径の頭部とを備えている。
そして、前記両保持器素子の各平板部同士を互いに重ね合わせると共に、互いに重ね合わせたこれら各平板部の貫通孔に前記各リベットの杆部を挿通した状態で、これら各杆部の先端部を押し潰して、これら各杆部よりも大径のかしめ部を形成し、互いに重ね合わせた前記各平板部同士を前記各リベットの頭部とかしめ部とで挟持する事により接合して、前記各曲板部に囲まれた部分を、それぞれ玉を転動自在に保持する為のポケットとしている。 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 an undulating metal plate and are formed into a corrugated annular shape, with partial spherical curved plate portions at a plurality of locations in the circumferential direction, adjacent to the circumferential direction. A flat plate portion is provided between the plate portions, and a through hole is provided in a part of each flat plate portion.
Each of the rivets is made of a metal capable of nitriding treatment, 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.

特に、本発明のうち、請求項１に記載した波形保持器の製造方法の場合、前記かしめ部を形成する以前の状態の前記各リベットの杆部のうちの前記頭部寄り部分と、前記両保持器素子のうちの一方の保持器素子の各貫通孔の内周面とのうちの何れか一方の部位に、円周方向に亙る凹凸面であるスプラインを形成している。
又、前記他方の部位は、これら各スプラインの凸部と締め代を有する状態で嵌合可能な円筒面である。
又、前記各スプラインの凸部と、前記円筒面とを締り嵌めで嵌合した状態で、これら各スプラインの凹部と、これら各凹部と対向するこの円筒面との間に隙間を存在させる。
そして、前記各スプラインの凸部と、前記円筒面とを嵌合する事により、中間組立体を構成した状態で、この中間組立体に対して窒化処理を施すと共に、前記両保持器素子のうちの他方の保持器素子に対して、単体のまま窒化処理を施す。
その後、前記中間組立体を構成する各リベットの杆部のうちの前記一方の保持器素子の各貫通孔から突出した部分を前記他方の保持器素子の各貫通孔に挿通すると共に前記両保持器素子の平板部同士を重ね合わせる。更に必要に応じて、これと同時に、これら両保持器素子の曲板部の内面同士の間に前記各玉を挟み込む。そして、この状態で、前記杆部の先端部に前記かしめ部を形成する。 In particular, in the method of manufacturing a corrugated cage according to claim 1 of the present invention, the portion near the head of the rivet of each rivet in a state before the caulking portion is formed, and the both Splines that are uneven surfaces extending in the circumferential direction are formed at any one of the inner peripheral surfaces of the through holes of one of the cage elements.
The other portion is a cylindrical surface that can be fitted in a state having a tightening allowance with the convex portion of each spline.
In addition, in a state where the projections of the respective splines and the cylindrical surface are fitted with an interference fit, a gap exists between the concave portions of the splines and the cylindrical surface facing the concave portions.
And, by fitting the projections of the respective splines and the cylindrical surface, in a state where the intermediate assembly is configured, the intermediate assembly is subjected to nitriding treatment, and among the two cage elements The other cage element is subjected to nitriding treatment as it is.
Thereafter, a portion protruding from each through hole of the one retainer element among the flange portions of each rivet constituting the intermediate assembly is inserted into each through hole of the other retainer element and the both retainers. The flat plate portions of the element are overlapped. Further, if necessary, the balls are sandwiched between the inner surfaces of the curved plate portions of both the cage elements. In this state, the caulking portion is formed at the distal end portion of the flange portion.

尚、一般的な波形保持器を構成する各ポケットの両端の開口幅は、それぞれこれら各ポケット内に保持すべき玉の直径よりも小さくなっている。この為、この様な一般的な波形保持器の場合には、完成後の状態で、前記各ポケット内に前記各玉を組み込む事はできない。従って、この様な一般的な波形保持器を対象として、上述した本発明の製造方法を実施する場合には、上述の様に、かしめ部を形成する前に１対の保持器素子の曲板部の内面同士の間に各玉を挟み込んでおく必要がある。
これに対し、特殊な例であるが、完成後の状態で、各ポケットの両端の開口幅のうち、一方の開口幅のみが、これら各ポケット内に保持すべき玉の直径よりも小さくなっており、他方の開口幅が、これら各玉の直径よりも大きくなっている波形保持器を対象として、上述した本発明の製造方法を実施する場合には、必ずしも、かしめ部を形成する前に１対の保持器素子の曲板部の内面同士の間に各玉を挟み込んでおく必要はない。 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.

又、本発明のうち、請求項２に記載した波形保持器は、前記かしめ部を形成する以前の状態の前記各リベットの杆部の前記頭部寄り部分と、前記両保持器素子のうちの一方の保持器素子の各貫通孔の内周面とのうちの何れか一方の部位に、円周方向に亙る凹凸面であるスプラインが形成されており、他方の部位が、これら各スプラインの凸部と締め代を有する状態で嵌合可能な円筒面である。
又、前記各リベットと前記一方の保持器素子とは、前記一方の部位に形成された各スプラインの凸部と、前記他方の部位に形成された円筒面とを締り嵌めで嵌合する事により、中間組立体を構成した状態で、この中間組立体に対して窒化処理を施されたものである。
更に、前記両保持器素子のうちの他方の保持器素子は、単体のまま窒化処理を施されたものである。 In the present invention, the corrugated cage according to claim 2 is a portion of the rivet that is close to the head of the rivet in a state before the caulking portion is formed. A spline that is a concavo-convex surface extending in the circumferential direction is formed in any one of the inner peripheral surfaces of the through holes of one cage element, and the other portion is a convex of the splines. It is the cylindrical surface which can be fitted in the state which has a part and a fastening allowance.
Further, each rivet and the one retainer element are formed by fitting a convex portion of each spline formed in the one part and a cylindrical surface formed in the other part with an interference fit. In this state, the intermediate assembly is subjected to nitriding treatment.
Further, the other of the cage elements is subjected to nitriding treatment as it is.

上述の様に構成する本発明によれば、一方の保持器素子に複数個のリベットを組み付けた中間組立体の状態で窒化処理を施した場合でも、この一方の保持器素子の各貫通孔の内周面及び、前記各リベットの杆部のうち、これら各貫通孔の内側に存在する部分の外周面の一部に窒化層を形成できて、耐久性に優れた波形保持器を得られる。
即ち、本発明の場合、前記リベットの杆部と前記一方の保持器素子の各貫通孔の内周面とのうちの何れか一方の部位にスプラインを形成すると共に、同じく他方の部位を、これら各スプラインの凸部と嵌合可能な円筒面としている。この為、前記一方の保持器素子と前記各リベットとを、これら各スプラインの凸部の先端面と、この円筒面とを締り嵌めで嵌合させる事により組み付けて構成した中間組立体の状態で、前記各スプラインの凹部と、これら各凹部と対向する前記円筒面との間に隙間を設ける事ができる。この結果、この様な中間組立体の状態で窒化処理を施した場合でも、前記各スプラインの凹部、及び、これら各凹部と対向する前記円筒面に、窒化層を形成できる。従って、前記一方の保持器素子の各貫通孔の内周面、及び、前記各リベットの杆部の頭部寄り部分の外周面の強度を確保して、保持器の耐久性を確保できる。
又、本発明の場合、前記一方の保持器素子の各貫通孔の内周面、及び、前記各リベットの杆部の頭部寄り部分に、窒化層を形成している。この為、当該部分の強度が、他の部分よりも著しく低くなる事がない。この結果、前記各リベットの先端部をかしめる際、これら各リベットの杆部の頭部寄り部分が、他の部分よりも外径を拡げる方向に大きく膨張する事を防止して、当該部分の外径側に存在する前記各貫通孔の内周面にひびや亀裂等が発生する事を防止できる。 According to the present invention configured as described above, even when nitriding is performed in the state of an intermediate assembly in which a plurality of rivets are assembled to one cage element, each through hole of the one cage element is formed. A nitrided layer can be formed on the inner peripheral surface and a part of the outer peripheral surface of the inner surface of each of the rivets, and a portion of the outer peripheral surface existing inside each through hole, thereby obtaining a corrugated cage having excellent durability.
That is, in the case of the present invention, a spline is formed at any one of the rivet collar and the inner peripheral surface of each through hole of the one cage element, and the other part is A cylindrical surface that can be fitted to the convex portion of each spline. For this reason, in the state of an intermediate assembly constructed by assembling the one retainer element and each rivet by fitting the front end surface of the convex portion of each spline and this cylindrical surface with an interference fit. A gap can be provided between the concave portion of each spline and the cylindrical surface facing each of the concave portions. As a result, even when nitriding is performed in the state of such an intermediate assembly, a nitrided layer can be formed on the concave portions of the splines and the cylindrical surface facing the concave portions. Therefore, the durability of the cage can be ensured by securing the strength of the inner circumferential surface of each through-hole of the one cage element and the outer circumferential surface of the portion near the head of the flange portion of each rivet.
In the case of the present invention, a nitride layer is formed on the inner peripheral surface of each through hole of the one retainer element and on the portion near the head of the collar portion of each rivet. For this reason, the intensity | strength of the said part does not become remarkably lower than another part. As a result, when caulking the tip of each rivet, the portion near the head of the ridge portion of each rivet is prevented from greatly expanding in the direction of expanding the outer diameter than the other portion, It is possible to prevent cracks, cracks and the like from occurring on the inner peripheral surface of each through hole present on the outer diameter side.

本発明の実施の形態の第１例を示す、中間組立体の状態に於ける、一方の保持器素子の貫通孔及びリベットの杆部の頭部寄り部分の形状を説明する為の、図６の拡大Ｘ−Ｘ断面に相当する部分拡大断面図。FIG. 6 illustrates a first example of an embodiment of the present invention, illustrating the shape of the through hole of one cage element and the shape of the head portion of the rivet collar in the state of the intermediate assembly. The partial expanded sectional view equivalent to the expanded XX cross section. 同じく、図１のＡ−Ａ断面に相当する、図８と同様の図。FIG. 9 is a view similar to FIG. 8 corresponding to the AA cross section of FIG. 1. 同第２例を示す、図１と同様の図。The figure similar to FIG. 1 which shows the 2nd example. 本発明の対象となる波形保持器を組み込んだ玉軸受の半部断面図。The half part sectional view of the ball bearing incorporating the corrugated cage used as the object of the present invention. 同じく波形保持器を取り出して示す斜視図。The perspective view which similarly takes out and shows a waveform holder. 従前の表面処理を施す方法に就いて説明する為の中間組立体の一部断面図。The fragmentary sectional view of the intermediate assembly for demonstrating about the method of performing the conventional surface treatment. 同じく窒化処理を施した後の状態を示す波形保持器の一部断面図。The partial sectional view of the waveform holder which shows the state after performing nitriding treatment similarly. 先発明の製造方法を説明する為の中間組立体の一部断面図（ａ）と、両保持器素子をリベットによりかしめ固定する直前の状態を示す一部断面図（ｂ）。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.

［実施の形態の第１例］
図１〜２は、本発明の実施の形態の第１例を示している。尚、本例の特徴は、保持器を構成する１対の保持器素子８、８のうちの、一方（図２の上方）の保持器素子８の各貫通孔１２ａの形状、及び、各リベット９の形状を工夫した点にある。この特徴部分以外の製造方法及び構造は、前述した先発明の波形保持器の製造方法及び構造、或いは、従来から知られている波形保持器の製造方法及び構造とほぼ同様であるから、先発明或いは従来構造と同様に構成する部分に就いては説明を簡略にし、以下、本例の特徴部分を中心に説明する。
尚、本例の対象となる、一般的な波形保持器とは、前述した様に、完成状態で、各ポケットの両端の開口幅が、それぞれこれら各ポケット内に保持すべき玉の直径よりも小さくなっているものを言う。 [First example of embodiment]
1 and 2 show a first example of an embodiment of the present invention. The feature of this example is that the shape of each through hole 12a of one of the cage elements 8 (upper side in FIG. 2) of the pair of cage elements 8 and 8 constituting the cage, and each rivet. The point is that the shape of 9 is devised. The manufacturing method and structure other than this characteristic part are substantially the same as the manufacturing method and structure of the waveform retainer of the prior invention described above, or the conventional manufacturing method and structure of the waveform retainer. Or description is simplified about the part comprised similarly to a conventional structure, and it demonstrates below centering on the characteristic part of this example.
In addition, as described above, the general waveform holder that is the object of this example is that the opening width of both ends of each pocket is larger than the diameter of the ball to be held in each pocket as described above. Say what is getting smaller.

本例の波形保持器は、図４〜７に示した従来構造の波形保持器７と同様に、１対の保持器素子８、８と、これら両保持器素子同士を接合する為の複数本のリベット９、９とから成る。
このうちの両保持器素子８、８は、鋼板、ステンレス鋼板等の、窒化処理可能な金属板製の素材に、プレスによる打ち抜き加工及び曲げ加工を施す事により、全体を波形の円環状に造られている。この様な両保持器素子８、８は、円周方向複数箇所に部分球面状の曲板部１０、１０を、円周方向に隣り合う曲板部１０、１０同士の間に平板部１１、１１を、これら各平板部１１、１１の円周方向中央部に貫通孔１２ａを、それぞれ備える。又、前記各リベット９、９は、鋼、ステンレス鋼等の、窒化処理可能な金属製で、杆部１３と、この杆部１３の基端部に設けられた頭部１５とを備える。 The waveform holder of this example is similar to the waveform holder 7 of the conventional structure shown in FIGS. 4 to 7, and a pair of cage elements 8, 8 and a plurality of them for joining these two cage elements together. Rivets 9, 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 and 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.

特に本発明の波形保持器の場合、前記両保持器素子８、８のうちの、一方の保持器素子８の各平板部１１に形成した各貫通孔１２ａの内周面（特許請求の範囲の一方の部位に相当）に、図１に示す様な、円周方向に亙る凹凸面である雌スプライン１９を形成している。又、この雌スプライン１９のうちの、凸部２０、２０の内径寸法（内接円直径）ｄ２０は、前記各リベット９の杆部１３の頭部１５寄り部分（特許請求の範囲の他方の部位に相当）に設けた円柱状の大径部１８の外径寸法Ｄ１８よりも僅かに小さくしている（ｄ２０＜Ｄ１８）。尚、前記各凸部２０、２０の先端面は、前記各リベット９の杆部１３の大径部１８に締り嵌めにより嵌合可能な、部分円筒状凹面である。 In particular, in the case of the corrugated cage of the present invention, the inner peripheral surface of each through-hole 12a formed in each flat plate portion 11 of one of the cage elements 8, 8 (of the claims) A female spline 19 that is an uneven surface extending in the circumferential direction as shown in FIG. 1 is formed in one part). Of the female spline 19, the inner diameter dimension (inscribed circle diameter) d20 of the projections 20 and 20 is a portion closer to the head 15 of the flange portion 13 of each rivet 9 (the other of the claims). It is slightly smaller than the outer diameter D 18 of the cylindrical large-diameter portion 18 provided (corresponding to the part) (d 20 <D 18 ). In addition, the front end surface of each said convex part 20 and 20 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.

一方、前記雌スプライン１９の凹部２１、２１の底部の内径寸法（内接円直径）ｄ２１は、前記大径部１８の外径寸法Ｄ１８よりも大きい（ｄ２１＞Ｄ１８）。
従って、前記各雌スプライン１９の各凸部２０、２０の内側に前記各リベット９の大径部１８を圧入した状態で、この雌スプライン１９の凹部２１、２１と、これら各凹部２１、２１と対向する前記各リベット９の大径部１８の外周面との間に隙間２２、２２が形成される。
尚、本例の場合、前記両保持器素子８、８のうちの他方（図２の下方）の保持器素子８の各貫通孔１２は、前述した従来構造及び先発明の構造と同様に円形に形成している。 Meanwhile, the inside diameter (inscribed circle diameter) d 21 of the bottom of the recess 21 of the female spline 19 is larger than the outer diameter D 18 of the large-diameter portion 18 (d 21> D 18) .
Therefore, in a state where the large-diameter portion 18 of each rivet 9 is press-fitted inside each convex portion 20, 20 of each female spline 19, the concave portions 21, 21 of the female spline 19, the concave portions 21, 21, Clearances 22 and 22 are formed between the opposing outer diameter surfaces of the large-diameter portions 18 of the rivets 9.
In the case of this example, each through-hole 12 of the other retainer element 8 (downward in FIG. 2) of the retainer elements 8 and 8 is circular as in the conventional structure and the structure of the previous invention. Is formed.

次に、以上の様な構成を有する本例の波形保持器の製造方法に就いて説明する。
先ず、前述した先発明と同様に、図２（ａ）に示した中間組立体１７ｂを組み立てる。具体的には、前記両保持器素子８、８のうち、一方の保持器素子８の外側（図２の上側）に前記各リベット９の頭部１５を配置すると共に、前記大径部１８を、前記各貫通孔１２ａの雌スプライン１９の各凸部２０、２０の内側に内嵌する。この状態で、これら各雌スプライン１９の各凹部２１、２１と、これら各凹部２１、２１と対向する前記各リベット９の大径部１８の外周面との間には、前記各隙間２２、２２が形成される。
次いで、上述の様に構成される中間組立体１７ｂに対して窒化処理を施す。一方、前記両保持器素子８、８のうち、他方の保持器素子８には、単体の状態で窒化処理を施す。 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. 2A is assembled in the same manner as the previous invention. Specifically, the head 15 of each rivet 9 is disposed outside one of the cage elements 8, 8 (upper side in FIG. 2), and the large-diameter portion 18 is The inner ends of the projections 20 and 20 of the female spline 19 of each through hole 12a are fitted inside. In this state, the gaps 22, 22 are formed between the recesses 21, 21 of the female splines 19 and the outer peripheral surface of the large-diameter portion 18 of the rivet 9 facing the recesses 21, 21. Is formed.
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.

この様な本例の場合、前記他方の保持器素子８は、その周面の全体に窒化層が形成される。一方、前記中間組立体１７ｂは、前記各雌スプライン１９の各凸部２０、２０と、前記各リベット９の大径部１８とが嵌合している為、当該部分には、窒化層が形成されない。又、前記各貫通孔１２ａの雌スプライン１９の各凹部２１、２１と、これら各凹部２１、２１と対向する前記各リベット９の大径部１８の外周面との間には、前記各隙間２２、２２が形成されている為、当該部分には、窒化層が形成される。   In the case of this example, a nitride layer is formed on the entire peripheral surface of the other cage element 8. On the other hand, in the intermediate assembly 17b, the projections 20 and 20 of the female splines 19 and the large-diameter portions 18 of the rivets 9 are fitted, so that a nitrided layer is formed in the portion. Not. The gaps 22 are formed between the recesses 21 and 21 of the female spline 19 of the through holes 12a and the outer peripheral surface of the large-diameter portion 18 of the rivet 9 facing the recesses 21 and 21, respectively. , 22 is formed, a nitride layer is formed in this portion.

次いで、図２（ｂ）に示す様に、前記中間組立体１７ｂの平板部１１と他方の保持器素子８の平板部１１とを重ね合わせた状態で、これら両保持器素子１７ｂ、８の曲板部１０、１０の内面同士の間に各玉６（図４参照）を挟み込む。そして、この状態で、前記各リベット９の先端部をかしめる事により、これら両保持器素子８、８同士を結合固定する。尚、この様なかしめ作業の際、前記各リベット９の杆部１３は、軸方向の押圧力を受けて、前記両保持器素子８、８の各貫通孔１２ａ、１２の内側で、径方向外方に膨張する様に塑性変形する。この様に前記各リベット９が塑性変形する事により、前記各隙間２２、２２を含む、これら各リベット９の外周面と前記各貫通孔１２ａ、１２の内周面との間に存在する隙間の一部或いは全部が消失する。この結果、前記両保持器素子８、８と前記各リベット９の杆部１３とは、がたつく事なく固定される。特に、本例の場合、前記一方の保持器素子８の各貫通孔１２ａの内周面に前記雌スプライン１９を形成している為、かしめ作業後のこれら各貫通孔１２ａ、１２ａと前記各リベット９との結合状態を強固にできる。   Next, as shown in FIG. 2B, in a state where the flat plate portion 11 of the intermediate assembly 17b and the flat plate portion 11 of the other cage element 8 are overlapped, the bending of both the cage elements 17b and 8 is performed. Each ball 6 (see FIG. 4) is sandwiched between the inner surfaces of the plate portions 10 and 10. 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 such a caulking operation, the flange portion 13 of each of the rivets 9 receives an axial pressing force and is radially inside the through holes 12a and 12 of the both cage elements 8 and 8. Plastically deforms to expand outward. As the rivets 9 are plastically deformed in this way, gaps existing between the outer peripheral surfaces of the rivets 9 and the inner peripheral surfaces of the through holes 12a and 12 including the gaps 22 and 22 are eliminated. Part or all of it disappears. As a result, both the cage elements 8 and 8 and the flange 13 of each rivet 9 are fixed without rattling. In particular, in the case of this example, since the female spline 19 is formed on the inner peripheral surface of each through hole 12a of the one retainer element 8, each through hole 12a, 12a and each rivet after caulking work are formed. 9 can be solidified.

上述の様な本例によれば、前記一方の保持器素子８に前記各リベット９を組み付けた状態（中間組立体１７ｂの状態）で窒化処理を施した場合でも、前記一方の保持器素子８の各貫通孔１２ａの内周面及び前記各リベット９の大径部１８の外周面の一部に窒化層を形成して、耐久性に優れた構造を実現できる。
即ち、本例の場合、前記各リベット９の杆部１３に円筒状の大径部１８を設けると共に、前記一方の保持器素子８の各貫通孔１２ａの内周面に、前記雌スプライン１９を形成している。この為、この雌スプライン１９の各凸部２０、２０の内側に、前記各リベット９の大径部１８を嵌合する事により構成した前記中間組立体１７ｂの状態で、前記雌スプライン１９の各凹部２１、２１と、これら各凹部２１、２１と対向する前記各リベット９の大径部１８の外周面との間に前記各隙間２２、２２を設ける事ができる。この結果、前記中間組立体１７ｂの状態で窒化処理を施した場合でも、前記雌スプラインの各凹部２１、２１、及び、これら各凹部２１、２１と対向する前記大径部１８の外周面に、窒化層を形成できる。従って、前記一方の保持器素子８の各貫通孔１２ａの内周面、及び、前記各リベット９の大径部１８の外周面の強度を確保して、保持器の耐久性を確保できる。 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 17b), the one cage element 8 A nitride layer is formed on the inner peripheral surface of each through-hole 12a 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 on the flange portion 13 of each rivet 9, and the female spline 19 is provided on the inner peripheral surface of each through-hole 12 a of the one cage element 8. Forming. For this reason, in the state of the intermediate assembly 17b configured by fitting the large-diameter portion 18 of each rivet 9 inside each convex portion 20, 20 of the female spline 19, each of the female spline 19 The clearances 22 and 22 can be provided between the recesses 21 and 21 and the outer peripheral surface of the large-diameter portion 18 of the rivet 9 facing the recesses 21 and 21. As a result, even when nitriding is performed in the state of the intermediate assembly 17b, the recesses 21 and 21 of the female spline and the outer peripheral surface of the large-diameter portion 18 facing the recesses 21 and 21, A nitride layer can be formed. Therefore, the strength of the inner peripheral surface of each through-hole 12a 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.

又、本例の場合、前記一方の保持器素子８の各貫通孔１２ａの内周面、及び、前記各リベット９の大径部１８の一部に、窒化層を形成できる。この為、当該部分の強度が、他の部分よりも著しく低くなる事がない。この結果、前記各リベット９の先端部をかしめる際、前記大径部１８の外径が、他の部分よりも大きく膨張する事を防止して、この大径部１８の外径側に存在する前記各貫通孔１２ａの内周面にひびや亀裂等が発生する事を防止できる。   In the case of this example, a nitride layer can be formed on the inner peripheral surface of each through hole 12a 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 and cracks from occurring on the inner peripheral surface of each through hole 12a.

［実施の形態の第２例］
図３は、本発明の実施の形態の第２例を示している。本例の場合、保持器を構成する両保持器素子８、８（図２参照）のうち、一方（図２の上方）の保持器素子８の各貫通孔１２ｂの内周面（特許請求の範囲の他方の部位に相当）を、円筒面としている。一方、各リベット９の頭部１５寄り部分（特許請求の範囲の一方の部位に相当）に、円周方向に亙る凹凸面である雄スプライン２３を形成している。又、この雌スプライン２３のうちの、凸部２４、２４の外径寸法（外接円直径）Ｄ２４は、前記一方の保持器素子８の各貫通孔１２ｂの内周面の内径寸法ｄ１２ｂよりも僅かに大きくしている（Ｄ２４＞ｄ１２ｂ）。尚、前記各凸部２４、２４の先端面は、前記各貫通孔１２ｂの内周面に締り嵌めにより嵌合可能な、部分円筒状凸面である。 [Second Example of Embodiment]
FIG. 3 shows a second example of the embodiment of the present invention. In the case of this example, of the two retainer elements 8 and 8 (see FIG. 2) constituting the retainer, the inner peripheral surface of each through hole 12b of one retainer element 8 (upper side in FIG. 2) (Corresponding to the other part of the range) is a cylindrical surface. On the other hand, a male spline 23, which is an uneven surface extending in the circumferential direction, is formed on a portion of each rivet 9 closer to the head 15 (corresponding to one part of the claims). Of the female spline 23, the outer diameter dimension (circumscribed circle diameter) D 24 of the convex portions 24, 24 is larger than the inner diameter dimension d 12 b of the inner peripheral surface of each through hole 12 b of the one retainer element 8. Is slightly increased (D 24 > d 12b ). In addition, the front end surface of each convex part 24 and 24 is a partial cylindrical convex surface which can be fitted to the inner peripheral surface of each said through-hole 12b by interference fitting.

一方、前記雄スプライン２３の凹部２５、２５の底部の外径寸法（外接円直径）Ｄ２５は、前記一方の保持器素子８の各貫通孔１２ｂの内周面の内径寸法ｄ１２ｂよりも小さい（Ｄ２５＜ｄ１２ｂ）。
従って、前記各雄スプライン２３の各凸部２４、２４を前記一方の保持器素子８の各貫通孔１２ｂの内側に圧入した状態で、前記雄スプライン２３の凹部２５、２５と、これら各凹部２５、２５と対向する前記各貫通孔１２ｂの内周面との間に隙間２６、２６が形成される。その他の構成及び作用・効果に就いては、前述した実施の形態の第１例の場合とほぼ同様である。 On the other hand, the outer diameter (circumferential circle diameter) D 25 of the bottom of the recesses 25, 25 of the male spline 23 is smaller than the inner diameter d 12b of the inner peripheral surface of each through hole 12b of the one retainer element 8. (D 25 <d 12b).
Accordingly, the concave portions 25, 25 of the male spline 23 and the concave portions 25 of the male spline 23 are inserted into the through holes 12b of the one cage element 8 while the convex portions 24, 24 of the male spline 23 are press-fitted. , 25 and gaps 26, 26 are formed between the inner peripheral surfaces of the through holes 12b facing each other. Other configurations and operations / effects are substantially the same as those in the first example of the embodiment described above.

本発明を実施する場合に、一方の保持器素子の各貫通孔に形成した雌スプライン（実施の形態の第１例の場合）の凹凸部、或いは。リベットの杆部に形成した雄スプライン（実施の形態の第２例の場合）の凹凸部の数は、適宜設定する事ができる。
又、前述した実施の形態の各例の場合、他方の保持器素子の貫通孔の形状が、円形状である為、一方の保持器素子の構造と他方の保持器素子の構造とが、互いに異なる。一方、本発明を実施する場合に、この他方の保持器素子の構造を、前記一方の保持器素子と同様の構造にする事もできる。この様に、これら両保持器素子同士を同一の構造とする事で、貫通孔の形状が互いに異なる二種類の保持器素子により構成する場合と比べて、製造コストを抑えられる。尚、この様な構造を採用した場合でも、図２（ｂ）に示す様に、リベットの先端寄り部分の外径寸法は、これら各リベットの杆部の頭部寄り部分の外径寸法よりも小さい。この為、これら各リベットの先端部が前記他方の保持器素子の貫通孔と締り嵌めで嵌合する事はない。従って、組み付けの際、組み付けづらくなる等の問題が生じる事もない。
又、本発明の波形保持器の製造方法及び波形保持器は、前述した一般的な波形保持器に限らず、各ポケットの両端の開口幅のうち、一方の開口幅のみが、これら各ポケット内に保持すべき玉の直径よりも小さくなっており、他方の開口幅が、これら各玉の直径よりも大きくなっている様な構造を含め、各種波形保持器を対象として実施する事ができる。 When practicing the present invention, an uneven portion of a female spline (in the case of the first example of the embodiment) formed in each through hole of one cage element, or. The number of concavo-convex portions of the male spline (in the case of the second example of the embodiment) formed on the collar portion of the rivet can be appropriately set.
Further, in each example of the embodiment described above, since the shape of the through hole of the other cage element is circular, the structure of one cage element and the structure of the other cage element are mutually Different. On the other hand, when carrying out the present invention, the structure of the other cage element can be the same as that of the one cage element. Thus, by making these two cage elements have the same structure, the manufacturing cost can be reduced as compared with the case where the cage holes are constituted by two types of cage elements having different shapes. Even when such a structure is adopted, as shown in FIG. 2 (b), the outer diameter of the rivet near the tip is larger than the outer diameter of the rivet flange near the head. small. For this reason, the front-end | tip part of each of these rivets does not fit with the through-hole of said other holder | retainer element by interference fitting. Therefore, problems such as difficulty in assembly do not occur.
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.

１ 玉軸受
２ 内輪軌道
３ 内輪
４ 外輪軌道
５ 外輪
６ 玉
７ 保持器
８ 保持器素子
９ リベット
１０ 曲板部
１１ 平板部
１２、１２ａ、１２ｂ 貫通孔
１３ 杆部
１４ かしめ部
１５ 頭部
１６ ポケット
１７、１７ａ、１７ｂ 中間組立体
１８ 大径部
１９ 雌スプライン
２０ 凸部
２１ 凹部
２２ 隙間
２３ 雄スプライン
２４ 凸部
２５ 凹部
２６ 隙間
２７ 窒化層















DESCRIPTION OF SYMBOLS 1 Ball bearing 2 Inner ring raceway 3 Inner ring 4 Outer ring raceway 5 Outer ring 6 Ball 7 Cage 8 Cage element 9 Rivets 10 Curved plate part 11 Flat plate part 12, 12a, 12b Through-hole 13 Claw part 14 Caulking part 15 Head part 16 Pocket 17 , 17a, 17b Intermediate assembly 18 Large diameter part 19 Female spline 20 Convex part 21 Concave part 22 Crevice 23 Male spline 24 Convex part 25 Concave part 26 Crevice 27 Nitride layer















Claims (2)

１対の保持器素子と、複数のリベットとを備え、
このうちの両保持器素子はそれぞれ、窒化処理可能な金属板により全体を波形の円環状に造られて、円周方向複数箇所に部分球面状の曲板部を、円周方向に隣り合う曲板部同士の間に平板部を、これら各平板部の一部に貫通孔を、それぞれ備えており、
前記各リベットはそれぞれ、窒化処理可能な金属製で、杆部と、この杆部の基端部に設けられた、この杆部よりも大径の頭部とを備えており、
前記両保持器素子の各平板部同士を互いに重ね合わせると共に、互いに重ね合わせたこれら各平板部の貫通孔に前記各リベットの杆部を挿通した状態で、これら各杆部の先端部を押し潰して、これら各杆部よりも大径のかしめ部を形成し、互いに重ね合わせた前記各平板部同士を前記各リベットの頭部とかしめ部とで挟持する事により接合して、前記各曲板部に囲まれた部分を、それぞれ玉を転動自在に保持する為のポケットとする波形保持器の製造方法であって、
前記かしめ部を形成する以前の状態の前記各リベットの杆部の頭部寄り部分と、前記両保持器素子のうちの一方の保持器素子の各貫通孔の内周面とのうちの何れか一方の部位に、円周方向に亙る凹凸面であるスプラインを形成すると共に、他方の部位を、これら各スプラインの凸部と締め代を有する状態で嵌合可能な円筒面とし、
前記各スプラインの凸部と、前記円筒面とを嵌合した状態で、これら各スプラインの凹部と、これら各凹部と対向するこの円筒面との間に隙間を形成し、
前記各スプラインの凸部と、前記円筒面とを締り嵌めで嵌合する事により、中間組立体を構成した状態で、この中間組立体に対して窒化処理を施すと共に、前記両保持器素子のうちの他方の保持器素子に対して、単体のまま窒化処理を施した後、
前記中間組立体を構成する各リベットの杆部のうちの前記一方の保持器素子の各貫通孔から突出した部分を前記他方の保持器素子の各貫通孔に挿通すると共に前記両保持器素子の平板部同士を重ね合わせた状態で、前記杆部の先端部に前記かしめ部を形成する事を特徴とする波形保持器の製造方法。 A pair of retainer elements and a plurality of rivets;
Both of these cage elements are each made of an undulating metal plate and are formed into a corrugated annular shape, with partial spherical curved plate portions at a plurality of locations in the circumferential direction, adjacent to the circumferential direction. A flat plate portion is provided between the plate portions, and a through hole is provided in a part of each flat plate portion.
Each of the rivets is made of a metal that can be nitrided, and includes a collar portion and a head portion having a diameter larger than that of the collar portion provided at a base end portion of the collar 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,
Either of the rivet head portion of the rivet in a state before forming the caulking portion and the inner peripheral surface of each through hole of one of the cage elements. A spline that is an uneven surface extending in the circumferential direction is formed on one part, and the other part is a cylindrical surface that can be fitted with a convex portion of each spline and a tightening margin,
In a state in which the convex portions of the splines and the cylindrical surfaces are fitted, a gap is formed between the concave portions of the splines and the cylindrical surfaces facing the concave portions,
By fitting the projections of each spline and the cylindrical surface with an interference fit, the intermediate assembly is subjected to nitriding treatment in a state where the intermediate assembly is configured, and both the cage elements are After performing nitriding treatment on the other of the cage elements alone,
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, wherein the caulking portion is formed at a distal end portion of the flange portion in a state where the flat plate portions are overlapped with each other. １対の保持器素子と、複数のリベットとを備え、
このうちの両保持器素子はそれぞれ、窒化処理可能な金属板により全体を波形の円環状に造られて、円周方向複数箇所に部分球面状の曲板部を、円周方向に隣り合う曲板部同士の間に平板部を、これら各平板部の一部に貫通孔を、それぞれ備えており、
前記各リベットはそれぞれ、窒化処理可能な金属製で、杆部と、この杆部の基端部に設けられた、この杆部よりも大径の頭部とを備えており、
前記両保持器素子の各平板部の内側面同士を互いに突き合わせると共に、互いに突き合わせたこれら各平板部の貫通孔に前記各リベットの杆部を挿通した状態で、これら各杆部の先端部を押し潰して、これら各杆部よりも大径のかしめ部を形成し、互いに突き合わせた前記各平板部同士を前記各リベットの頭部とかしめ部とで挟持する事により接合して、前記各曲板部に囲まれた部分を、それぞれ玉を転動自在に保持する為のポケットとした波形保持器であって
前記かしめ部を形成する以前の状態の前記各リベットの杆部の頭部寄り部分と、前記両保持器素子のうちの一方の保持器素子の各貫通孔の内周面とのうちの何れか一方の部位に、円周方向に亙る凹凸面であるスプラインが形成されており、
前記他方の部位が、前記各スプラインの凸部と締め代を有する状態で嵌合可能な円筒面であり、
前記各リベットと前記一方の保持器素子とは、前記一方の部位に形成された各スプラインの凸部と、前記他方の部位に形成された円筒面とを締り嵌めで嵌合する事により、中間組立体を構成した状態で、この中間組立体に対して窒化処理を施されたものであり、
前記両保持器素子のうちの他方の保持器素子は、単体のまま窒化処理を施されたものである事を特徴とする波形保持器。 A pair of retainer elements and a plurality of rivets;
Both of these cage elements are each made of an undulating metal plate and are formed into a corrugated annular shape, with partial spherical curved plate portions at a plurality of locations in the circumferential direction, adjacent to the circumferential direction. A flat plate portion is provided between the plate portions, and a through hole is provided in a part of each flat plate portion.
Each of the rivets is made of a metal that can be nitrided, and includes a collar portion and a head portion having a diameter larger than that of the collar portion provided at a base end portion of the collar 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 holder in which a portion surrounded by a plate portion is a pocket for holding a ball so that it can roll freely, and a portion near the head portion of the ridge portion of each rivet in a state before forming the caulking portion And a spline that is an uneven surface extending in the circumferential direction is formed on any one of the inner peripheral surfaces of the through holes of one of the cage elements.
The other part is a cylindrical surface that can be fitted in a state having a tightening margin with a convex part of each spline,
The rivets and the one retainer element are formed by fitting the projections of the splines formed in the one part and the cylindrical surface formed in the other part with an interference fit. In a state where the assembly is configured, this intermediate assembly is subjected to nitriding treatment,
The waveform retainer, wherein the other retainer element of the both retainer elements is subjected to nitriding treatment as it is.
JP2013176651A 2013-08-28 2013-08-28 Manufacturing method of corrugated cage and corrugated cage Pending JP2015045371A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017166620A (en) * 2016-03-17 2017-09-21 Ntn株式会社 Method for manufacturing waveform retainer and its waveform retainer intermediate unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017166620A (en) * 2016-03-17 2017-09-21 Ntn株式会社 Method for manufacturing waveform retainer and its waveform retainer intermediate unit

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