JP3933336B2 - Cage for thrust needle roller bearing and method for manufacturing the same - Google Patents

Cage for thrust needle roller bearing and method for manufacturing the same Download PDF

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JP3933336B2
JP3933336B2 JP02042899A JP2042899A JP3933336B2 JP 3933336 B2 JP3933336 B2 JP 3933336B2 JP 02042899 A JP02042899 A JP 02042899A JP 2042899 A JP2042899 A JP 2042899A JP 3933336 B2 JP3933336 B2 JP 3933336B2
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JP2000213546A (en
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龍司 木村
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NTN Corp
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NTN Corp
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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
    • F16C33/46—Cages for rollers or needles
    • F16C33/54—Cages for rollers or needles made from wire, strips, or sheet metal
    • F16C33/542—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal
    • F16C33/543—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from a single part
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/30—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly

Description

【０００１】
【発明の属する技術分野】
この発明は、スラスト針状ころ軸受に用いられる薄鋼板製の保持器と、その製造方法に関するものである。
【０００２】
【従来の技術】
スラスト針状ころ軸受には、材料費の低減と軽量化を目的として、薄鋼板をプレス加工で一体成形した保持器を用いたものがある。
【０００３】
この種のスラスト針状ころ軸受は、本発明の実施形態である図１に示すように、環状の薄鋼板ブランクの内外周に折り曲げ折り返しで形成された鍔２、３が設けられ、これらの鍔２、３の間の中間環状部にハット形断面４が形成され、この中間環状部に、円周方向に等間隔で複数のポケット５が設けられた保持器１を用い、針状ころ６を各ポケット５に収納して、ポケット５の半径方向縁と、前記ハット形断面４の円周方向縁で針状ころ６を保持したものである。
【０００４】
前記従来の薄鋼板製の保持器は、図５に示すような工程で製造されている。すなわち、薄鋼板から環状のブランク２１を打ち抜き（ａ）、このブランク２１の中間環状部を、製品寸法よりわずかに高く、断面長さが長いハット形断面２２’に絞り加工で粗成形し（ｂ）、ブランク２１の内外周両側に環状の折り曲げ段差２３、２４を絞り加工で成形するとともに、前記ハット形断面２２’の幅と高さを製品寸法に等しく仕上げ成形し（ｃ）、各折り曲げ段差２３、２４の外側を折り返して内外周の鍔２５、２６を成形し（ｄ）、最後に、図５（ｅ）に拡大して示すように、ハット形断面２２を仕上げ成形した中間環状部に、ポケット２７を円周方向に等間隔で打ち抜いている。なお、図５（ｃ）に示したハット形断面２２の仕上げ成形のあとには、通常、薄鋼板の面内異方性に起因して絞り加工で生じるブランク２１内外周縁の不揃いを揃えるため、内外径の仕上げ打ち抜きが行われている。
【０００５】
【発明が解決しようとする課題】
上述した従来のスラスト針状ころ軸受用保持器は、環状の薄鋼板ブランクを絞り加工して、中間環状部のハット形断面と、その内外周両側の環状折り曲げ段差を成形しているため、ブランクの内周側では伸びフランジ変形が、外周側では絞り変形が生じ、これらの塑性変形に伴って半径方向の引張応力が発生する。特に、前記ハット形断面の屈曲コーナ部では、曲げ変形も加わるため、この引張曲げ変形によって、図５（ｅ）に示したように、屈曲コーナ部の板厚が著しく減少し、保持器の剛性と強度が低下する問題がある。この屈曲コーナ部の板厚減少は、ハット形断面の絞り高さが高い保持器ほど大きくなる。
【０００６】
前述したように、従来は前記ハット形断面を成形する際に、ハット形断面の幅と高さに余裕代を持たせて粗成形し、後の折り曲げ段差を絞り加工するときに発生する前記半径方向の引張応力を緩和するようにしているが、前記屈曲コーナ部の最小板厚は、素材板厚の７０％を確保するのが精一杯である。
【０００７】
そこで、この発明の課題は、屈曲コーナ部での板厚減少を少なくして、高い剛性と強度を確保できるスラスト針状ころ軸受用保持器と、その製造方法を提供することである。
【０００８】
【課題を解決するための手段】
上記の課題を解決するために、この発明は、環状の鋼板を素材として、その内外周に折り曲げ折り返しで形成された鍔が設けられ、これらの鍔の間の中間環状部がハット形断面に形成され、この中間環状部に針状ころを収納する複数のポケットが円周方向に等間隔で設けられ、このポケットの半径方向縁と、前記ハット形断面の円周方向縁で針状ころを保持するスラスト針状ころ軸受用保持器において、前記ハット形断面の屈曲コーナ部の最小板厚を素材板厚の７５％以上、好ましくは８５％以上とした構成を採用したのである。
【０００９】
すなわち、前記屈曲コーナ部の最小板厚を素材板厚の７５％以上、好ましくは８５％以上とすることにより、強度部品として最も弱い屈曲コーナ部の強度を高め、長寿命の保持器を提供できるようにしたのである。
【００１０】
前記折り曲げ折り返しで形成された内外周の鍔の少なくともいずれか一方を、折り返しを重ね合わせて形成することにより、保持器の剛性をより高めることができる。
【００１１】
前記保持器をころ案内型のものとして、保持器のポケットと針状ころとの軸方向隙間を、針状ころが転動案内される軌道輪と保持器との隙間よりも小さくすることにより、保持器の円周方向のがたを少なくし、スラスト針状ころ軸受使用時に発生する音を低減することができる。
【００１２】
また、この発明は、素材鋼板から環状ブランクを打ち抜くブランキング工程と、打ち抜かれたブランクの中間環状部をハット形断面に成形するハット形断面成形工程と、ブランクの内外周両側に環状の折り曲げ段差を成形する折り曲げ工程と、この各折り曲げ段差の外側を折り返す折り返し工程と、前記中間環状部に、針状ころを収納する複数のポケットを円周方向に等間隔で打ち抜くポケット打ち抜き工程とを有するスラスト針状ころ軸受用保持器の製造方法において、前記ハット形断面成形工程を、ハット形断面の断面長さと屈曲コーナ部の断面曲率半径を製品寸法よりも大きく成形する予備成形と、前記断面長さと断面曲率半径を製品寸法に等しく成形する仕上げ成形とに分け、この仕上げ成形を前記折り曲げ工程以降に行い、前記屈曲コーナ部の最小板厚を素材板厚の７５％以上、好ましくは８５％以上とする方法を採用したのである。
【００１３】
すなわち、前記ハット形断面を成形する際に、ハット形断面の屈曲コーナ部の断面曲率半径を製品寸法よりも大きく予備成形することにより、この予備成形に伴う材料流れが屈曲コーナ部で拘束されるのを緩和するとともに、屈曲コーナ部での曲げ変形を緩和し、前記引張曲げ変形による板厚減少が屈曲コーナ部に集中するのを防止し、さらに、予備成形でハット形断面の断面長さと屈曲コーナ部の断面曲率半径を製品寸法よりも大きく成形し、これらを製品寸法に等しく成形する仕上げ成形を前記折り曲げ工程以降に行うことにより、折り曲げ工程で環状の折り曲げ段差を絞り加工するときに発生する前記半径方向の引張応力を低減するとともに、この引張応力の屈曲コーナ部への集中を避け、屈曲コーナ部での最小板厚を素材板厚の７５％以上に確保できるようにしたのである。
【００１４】
前記ハット形断面を予備成形する手段としては、前記打ち抜かれたブランクを、前記製品のハット形断面屈曲コーナ部の断面曲率半径よりも大きい肩半径で一方向に絞って、環状の折り曲げ段差を成形し、この折り曲げ段差の内周側または外周側に、前記絞り方向と逆方向に、同じく製品の断面曲率半径よりも大きい肩半径で逆絞りし、前記折り曲げ段差と逆向きの環状の折り曲げ段差を成形して、この２つの折り曲げ段差でハット形断面を予備成形する方法を採用することができる。
【００１５】
前記ブランキング工程で打ち抜くブランクの内径を、製品の内径寸法を確保できる範囲内の最大限界寸法に近づけることにより、前記絞り加工で生じるブランク内周側の伸びフランジ変形の変形抵抗を小さくして、半径方向の引張応力を低減し、前記屈曲コーナ部での板厚減少をより少なくすることができる。
【００１６】
【発明の実施の形態】
以下、図１乃至図４に基づき、この発明の実施形態を説明する。図１は、実施形態の保持器１を用いたスラスト針状ころ軸受を示す。このスラスト針状ころ軸受は、前述したように、環状の薄鋼板ブランクの内外周に折り曲げ折り返しで形成された鍔２、３が設けられ、これらの鍔２、３の間の中間環状部にハット形断面４が形成され、この中間環状部に、円周方向に等間隔で複数のポケット５が設けられた保持器１を用い、針状ころ６を各ポケット５に収納して、ポケット５の半径方向縁と、前記ハット形断面４の円周方向縁で針状ころ６を保持したものである。
【００１７】
前記保持器１は、図２に示すように、薄鋼板から環状のブランク７を打ち抜き（ａ）、このブランク７の中間環状部を、前記製品のハット形断面４の屈曲コーナ部の断面曲率半径よりも大きい肩半径の工具で絞り加工して、環状の折り曲げ段差８を成形し（ｂ）、この絞り加工で形成された折り曲げ段差８の外周側に、前記絞り方向と逆方向に、同じく製品の断面曲率半径よりも大きい肩半径の工具で、折り曲げ段差８と逆向きの環状の折り曲げ段差９を逆絞りして、２つの折り曲げ段差８、９で、その断面長さと屈曲コーナ部の断面曲率半径が製品のハット形断面４よりも大きいハット形断面４’を予備成形し（ｃ）、このハット形断面４’の内外周両側に、同じく製品の断面曲率半径よりも大きい肩半径の工具で絞り加工を施して、環状の折り曲げ段差１０、１１を予備成形し（ｄ）、前記ハット形断面４’と各折り曲げ段差１０、１１を、製品寸法に等しく仕上げ成形し（ｅ）、各折り曲げ段差１０、１１の外側を折り返して、前記内外周の鍔２、３を成形し（ｆ）、最後に、図３に拡大して示すように、ハット形断面４が成形された中間環状部にポケット５を円周方向に等間隔で打ち抜いて製造されている。
【００１８】
図２（ａ）の工程で打ち抜かれたブランク７の内径は、図２（ｂ）〜（ｄ）の工程での絞り加工で生じる伸びフランジ変形の変形抵抗を小さくするため、図５（ａ）に示したブランク２１の内径よりも大きくなっている。また、図示は省略するが、図２（ｅ）のハット形断面４と各折り曲げ段差１０、１１の仕上げ成形のあとには、内外径の仕上げ打ち抜きが行われている。
【００１９】
図３（ａ）に示すように、この保持器１のハット形断面４の屈曲コーナ部は、図５（ｅ）に示した従来の保持器のように著しい板厚減少が見られず、その最小板厚は素材板厚の８５％以上になっている。また、この保持器１は、外周側の鍔３が折り返しを重ね合わせて形成され、内周側の鍔２の折り返しは隙間を空けて形成されている。この折り返しの隙間は、スラスト針状ころ軸受の内周側に通される軸等とのガイド隙間を調整するために設けられたものであり、必要に応じて外周側の鍔３に設けることもできる。
【００２０】
図３（ｂ）に示すように、前記各ポケット５は、ハット形断面４の立ち上がり部４ａが、針状ころ６に当たらないように、切り込み１２を設けられており、各切り込み１２の両側に張り出すハット形断面４の上底面４ｂと下底面４ｃで針状ころ６の胴部を抱くようになっている。
【００２１】
また、この保持器１はころ案内型のものであり、図４に示すように、スラスト針状ころ軸受の両軸端に配置された針状ころ６が転動案内される軌道輪１３、１４と保持器１との軸方向隙間１５よりも、前記ハット形断面４立ち上がり部４ａの切り込み１２の両側に張り出した上底面４ｂおよび下底面４ｃと、針状ころ６胴部との軸方向隙間１６の方が小さく形成されている。
【００２２】
上述した実施形態では、前記ハット形断面の予備成形での２つの折り曲げ段差の成形に際して、内周側の折り曲げ段差を先に成形したが、外周側の折り曲げ段差を先に成形することもできる。また、ハット形断面の内外周両側の環状折り曲げ段差についても緩やかな断面曲率に予備成形したのち、ハット形断面と同時に仕上げ成形したが、直接これらの環状折り曲げ段差を仕上げ成形し、このとき同時にハット形断面を仕上げ成形してもよい。この場合は、図２に示した工程を採用したときよりも屈曲コーナ部の最小板厚が若干薄くなるが、素材板厚の７５％以上とすることはできる。
【００２３】
【発明の効果】
以上のように、この発明のスラスト針状ころ軸受用保持器は、環状の薄鋼板ブランクを素材として、内外周の鍔の間の中間環状部をハット形断面とし、このハット形断面の屈曲コーナ部の最小板厚を素材板厚の７５％以上、好ましくは８５％以上としたので、強度部品として最も弱い屈曲コーナ部の強度を高めて、長寿命を確保することができる。
【００２４】
また、この発明のスラスト針状ころ軸受用保持器の製造方法は、前記ハット形断面を成形する際に、ハット形断面の断面長さと屈曲コーナ部の断面曲率半径を製品寸法よりも大きく予備成形し、このハット形断面の仕上げ成形を、その内外周両側の環状折り曲げ段差の成形以降に行うようにしたので、ハット形断面の予備成形や環状折り曲げ段差の成形のための絞り加工に伴う引張曲げ変形が、屈曲コーナ部に集中するのを緩和し、屈曲コーナ部での最小板厚を素材板厚の７５％以上に確保することができる。
【図面の簡単な説明】
【図１】実施形態の保持器を用いたスラスト針状ころ軸受を示す平面図
【図２】ａ、ｂ、ｃ、ｄ、ｅ、ｆは図１の保持器の製造工程を示す断面図
【図３】ａは図１の保持器の一部省略断面図、ｂはａの平面図
【図４】図３のIV−IV線に沿った断面図
【図５】ａ、ｂ、ｃ、ｄ、ｅは従来の保持器の製造工程を示す断面図
【符号の説明】
１ 保持器
２、３ 鍔
４、４’ ハット形断面
４ａ 立ち上がり部
４ｂ 上底面
４ｃ 下底面
５ ポケット
６ 針状ころ
７ ブランク
８、９、１０、１１ 折り曲げ段差
１２ 切り込み
１３、１４ 軌道輪
１５、１６ 隙間
２１ ブランク
２２、２２’ ハット形断面
２３、２４ 折り曲げ段差
２５、２６ 鍔
２７ ポケット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cage made of a thin steel plate used for a thrust needle roller bearing and a manufacturing method thereof.
[0002]
[Prior art]
Some thrust needle roller bearings use a cage in which a thin steel plate is integrally formed by pressing for the purpose of reducing material costs and reducing weight.
[0003]
As shown in FIG. 1 which is an embodiment of the present invention, this type of thrust needle roller bearing is provided with flanges 2 and 3 formed by folding and folding on the inner and outer circumferences of an annular thin steel sheet blank. A hat-shaped cross section 4 is formed in an intermediate annular portion between 2 and 3, and a needle roller 6 is attached to the intermediate annular portion using a cage 1 provided with a plurality of pockets 5 at equal intervals in the circumferential direction. The needle rollers 6 are held in the respective pockets 5 and held at the radial edges of the pockets 5 and the circumferential edges of the hat-shaped cross section 4.
[0004]
The conventional thin steel plate cage is manufactured by a process as shown in FIG. That is, an annular blank 21 is punched from a thin steel plate (a), and an intermediate annular portion of the blank 21 is roughly formed by drawing into a hat-shaped cross-section 22 ′ that is slightly higher than the product dimensions and has a long cross-sectional length (b). ), Annular folding steps 23 and 24 are formed on the inner and outer peripheral sides of the blank 21 by drawing, and the width and height of the hat-shaped cross section 22 ′ are finished to be equal to the product dimensions (c). 23 and 24 are folded back to form inner and outer peripheries 25 and 26 (d), and finally, as shown in an enlarged view in FIG. The pockets 27 are punched at equal intervals in the circumferential direction. In addition, after the finish forming of the hat-shaped cross section 22 shown in FIG. 5 (c), in order to align the irregularity of the inner and outer peripheral edges of the blank 21 that usually occurs in the drawing process due to the in-plane anisotropy of the thin steel plate, Finished punching of inner and outer diameters is performed.
[0005]
[Problems to be solved by the invention]
The above-mentioned conventional thrust needle roller bearing retainer is formed by drawing an annular thin steel plate blank to form a hat-shaped cross section of the intermediate annular portion and annular bending steps on both inner and outer circumferences. Stretch flange deformation occurs on the inner peripheral side, and drawing deformation occurs on the outer peripheral side, and radial tensile stress is generated along with these plastic deformations. In particular, since bending deformation is also applied to the bent corner portion of the hat-shaped cross section, the tensile bending deformation significantly reduces the thickness of the bent corner portion as shown in FIG. There is a problem that strength decreases. The reduction in the thickness of the bent corner portion becomes larger as the cage has a higher drawing height of the hat-shaped cross section.
[0006]
As described above, conventionally, when the hat-shaped section is formed, the radius generated when the hat-shaped section is rough-formed with an allowance for the width and height of the hat-shaped section and the subsequent bending step is drawn. Although the tensile stress in the direction is relaxed, it is absolutely sufficient to ensure that the minimum thickness of the bent corner portion is 70% of the material thickness.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a thrust needle roller bearing retainer that can secure a high rigidity and strength by reducing a reduction in plate thickness at a bent corner portion, and a method for manufacturing the same.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention uses an annular steel plate as a raw material, and is provided with folds formed by folding back on the inner and outer circumferences, and an intermediate annular portion between these ridges is formed in a hat-shaped cross section. A plurality of pockets for storing the needle rollers in the intermediate annular portion are provided at equal intervals in the circumferential direction, and the needle rollers are held by the radial edge of the pocket and the circumferential edge of the hat-shaped cross section. The thrust needle roller bearing retainer has a configuration in which the minimum thickness of the bent corner portion of the hat-shaped cross section is 75% or more, preferably 85% or more of the material plate thickness.
[0009]
That is, by setting the minimum thickness of the bent corner portion to 75% or more, preferably 85% or more of the material plate thickness, it is possible to increase the strength of the weakest bent corner portion as a strength component and provide a long-life cage. I did it.
[0010]
The rigidity of the cage can be further increased by forming at least one of the inner and outer peripheral ridges formed by folding and folding by overlapping the folding.
[0011]
By making the cage a roller guide type, by making the axial gap between the cage pocket and the needle roller smaller than the gap between the bearing ring on which the needle roller rolls and the cage, The backlash of the cage in the circumferential direction can be reduced, and the noise generated when the thrust needle roller bearing is used can be reduced.
[0012]
The present invention also includes a blanking process for punching an annular blank from a raw steel plate, a hat-shaped section forming process for forming an intermediate annular portion of the punched blank into a hat-shaped section, and annular bending steps on both inner and outer peripheral sides of the blank. A thrusting step, a folding step of folding back the outside of each folding step, and a pocket punching step of punching a plurality of pockets storing needle rollers in the intermediate annular portion at equal intervals in the circumferential direction. In the method for manufacturing a needle roller bearing retainer, the hat-shaped cross-section forming step includes a preforming for forming a cross-sectional length of the hat-shaped cross section and a cross-sectional radius of curvature of the bent corner portion larger than a product dimension, and the cross-sectional length The section radius of curvature is divided into finish molding, which is formed to be equal to the product dimensions. The minimum thickness of the corner portion material thickness of 75% or more, of preferably adopted a method of 85% or more.
[0013]
That is, when forming the hat-shaped cross section, by pre-forming the radius of curvature of the bent corner portion of the hat-shaped cross section to be larger than the product size, the material flow associated with this preforming is restrained at the bent corner portion. In addition, the bending deformation at the bent corner portion is reduced, the reduction of the plate thickness due to the tensile bending deformation is prevented from concentrating on the bent corner portion, and the cross-sectional length and bending of the hat-shaped cross section are preformed. Occurs when drawing the annular bending step in the folding process by forming the corner section with a radius of curvature larger than the product dimension and performing the finish molding after the folding process to form them equal to the product dimension. While reducing the tensile stress in the radial direction, avoiding concentration of this tensile stress on the bent corner portion, the minimum plate thickness at the bent corner portion is set to 75% of the material plate thickness. Than it was possible to ensure the above.
[0014]
As a means for pre-molding the hat-shaped cross section, the punched blank is squeezed in one direction with a shoulder radius larger than the cross-section radius of curvature of the hat-shaped cross-section bending corner of the product to form an annular folding step. Then, on the inner peripheral side or the outer peripheral side of the bending step, reverse drawing is performed with a shoulder radius that is larger than the sectional curvature radius of the product in the direction opposite to the drawing direction, and an annular bending step opposite to the bending step is formed. It is possible to adopt a method of forming and pre-forming a hat-shaped cross section with these two folding steps.
[0015]
By reducing the inner diameter of the blank punched in the blanking step to the maximum critical dimension within the range that can secure the inner diameter dimension of the product, the deformation resistance of the stretch flange deformation on the inner peripheral side of the blank generated in the drawing process is reduced, The tensile stress in the radial direction can be reduced, and the thickness reduction at the bent corner portion can be further reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a thrust needle roller bearing using the cage 1 of the embodiment. As described above, the thrust needle roller bearing is provided with the flanges 2 and 3 formed by bending and folding on the inner and outer circumferences of the annular thin steel sheet blank, and the hat is formed in the intermediate annular portion between the flanges 2 and 3. Using the cage 1 in which a plurality of pockets 5 are provided at equal intervals in the circumferential direction in the intermediate annular portion, the needle rollers 6 are accommodated in the pockets 5 and the pockets 5 Needle rollers 6 are held by a radial edge and a circumferential edge of the hat-shaped cross section 4.
[0017]
As shown in FIG. 2, the cage 1 is formed by punching an annular blank 7 from a thin steel plate (a), and using the intermediate annular portion of the blank 7 as a sectional curvature radius of a bent corner portion of the hat-shaped section 4 of the product. (B) is formed by drawing with a tool having a larger shoulder radius, and the product is also formed on the outer peripheral side of the bending step 8 formed by this drawing in the direction opposite to the drawing direction. With a tool having a shoulder radius larger than the cross-sectional curvature radius, the annular bending step 9 opposite to the bending step 8 is reverse-drawn, and the two bending steps 8 and 9 have the cross-sectional length and the cross-sectional curvature of the bent corner portion. A hat-shaped section 4 ′ having a radius larger than the hat-shaped section 4 of the product is preformed (c), and a tool having a shoulder radius which is also larger than the section curvature radius of the product is formed on both inner and outer peripheral sides of the hat-shaped section 4 ′. Applying a drawing process Bending steps 10 and 11 are preformed (d), and the hat-shaped cross-section 4 ′ and the folding steps 10 and 11 are finished and formed to be equal to the product dimensions (e), and the outer sides of the folding steps 10 and 11 are folded back. Then, the inner and outer peripheries 2 and 3 are formed (f), and finally, as shown in an enlarged view in FIG. 3, pockets 5 are provided in the circumferential direction in the intermediate annular portion where the hat-shaped cross section 4 is formed. It is manufactured by punching at intervals.
[0018]
The inner diameter of the blank 7 punched out in the process of FIG. 2A is used to reduce the deformation resistance of the stretch flange deformation generated in the drawing process in the processes of FIGS. 2B to 2D. It is larger than the inner diameter of the blank 21 shown in FIG. Although illustration is omitted, after the hat-shaped section 4 and the folding steps 10 and 11 of FIG. 2 (e) are finish-molded, finish punching of the inner and outer diameters is performed.
[0019]
As shown in FIG. 3 (a), the bent corner portion of the hat-shaped cross section 4 of the cage 1 does not show a significant reduction in plate thickness as in the conventional cage shown in FIG. 5 (e). The minimum plate thickness is 85% or more of the material plate thickness. In addition, the cage 1 is formed such that the outer peripheral side collar 3 is overlapped and the inner circumferential side collar 2 is folded with a gap. This folding gap is provided to adjust the guide gap with the shaft or the like passed through the inner peripheral side of the thrust needle roller bearing, and may be provided in the flange 3 on the outer peripheral side as necessary. it can.
[0020]
As shown in FIG. 3 (b), each of the pockets 5 is provided with cuts 12 so that the rising portions 4 a of the hat-shaped cross section 4 do not hit the needle rollers 6. The body of the needle roller 6 is held by the upper bottom surface 4b and the lower bottom surface 4c of the protruding hat-shaped cross section 4.
[0021]
Further, the cage 1 is of a roller guide type, and as shown in FIG. 4, the race rings 13 and 14 on which the needle rollers 6 disposed at both shaft ends of the thrust needle roller bearing are guided to roll. And an axial gap 16 between the upper bottom surface 4b and the lower bottom surface 4c projecting on both sides of the notch 12 of the hat-shaped cross-section 4 rising portion 4a, and the needle roller 6 body portion, rather than the axial clearance 15 between the roller and the cage 1. Is smaller.
[0022]
In the above-described embodiment, when forming the two folding steps in the hat-shaped cross-section preforming, the inner circumferential side folding step is formed first, but the outer circumferential side bending step can be formed first. In addition, the annular bending steps on both the inner and outer circumferences of the hat-shaped cross section were preformed to a gentle cross-sectional curvature, and then finish-molded at the same time as the hat-shaped cross-section. The cross section may be finished. In this case, the minimum thickness of the bent corner is slightly thinner than when the process shown in FIG. 2 is adopted, but it can be 75% or more of the material thickness.
[0023]
【The invention's effect】
As described above, the thrust needle roller bearing retainer of the present invention has an annular thin steel plate blank as a raw material, an intermediate annular portion between inner and outer peripheral flanges having a hat-shaped section, and a bent corner of the hat-shaped section. Since the minimum thickness of the portion is 75% or more, preferably 85% or more of the material plate thickness, the strength of the weakest bent corner portion as the strength component can be increased to ensure a long life.
[0024]
Further, according to the manufacturing method of the thrust needle roller bearing retainer of the present invention, when forming the hat-shaped cross section, the cross-sectional length of the hat-shaped cross section and the cross-sectional curvature radius of the bent corner portion are preformed larger than the product dimensions. Since the hat-shaped cross-section is finished after the formation of the annular bending step on both the inner and outer circumferences, the tensile bending associated with the pre-forming of the hat-shaped section and the drawing process for forming the annular bending step is performed. It is possible to alleviate the concentration of deformation at the bent corner portion, and to secure the minimum plate thickness at the bent corner portion to 75% or more of the material plate thickness.
[Brief description of the drawings]
FIG. 1 is a plan view showing a thrust needle roller bearing using a cage according to an embodiment. FIG. 2 is a cross-sectional view showing manufacturing steps of the cage shown in FIG. 1; a, b, c, d, e, and f; 3 is a partially omitted cross-sectional view of the cage of FIG. 1, b is a plan view of a, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3, and FIG. , E is a cross-sectional view showing the manufacturing process of a conventional cage
DESCRIPTION OF SYMBOLS 1 Cage 2, 3 cage | basket 4, 4 'Hat-shaped cross section 4a Standing part 4b Upper bottom surface 4c Lower bottom surface 5 Pocket 6 Needle roller 7 Blank 8, 9, 10, 11 Bending level | step 12 Notches 13, 14 Track rings 15, 16 Gap 21 Blank 22, 22 'Hat-shaped cross section 23, 24 Bending step 25, 26 鍔 27 Pocket

Claims (1)

素材鋼板から環状ブランクを打ち抜くブランキング工程と、打ち抜かれたブランクの中間環状部をハット形断面に成形するハット形断面成形工程と、ブランクの内外周両側に環状の折り曲げ段差を成形する折り曲げ工程と、この各折り曲げ段差の外側を折り返す折り返し工程と、前記中間環状部に、針状ころを収納する複数のポケットを円周方向に等間隔で打ち抜くポケット打ち抜き工程とを有し、前記ハット形断面成形工程を、ハット形断面の断面中心線に沿う断面長さを製品寸法よりも長く成形する予備成形と、前記ハット形断面を製品寸法に等しく成形する仕上げ成形とに分けたスラスト針状ころ軸受用保持器の製造方法において、前記ハット形断面成形工程でハット形断面を予備成形する手段を、前記打ち抜かれたブランクを、前記製品のハット形断面の屈曲コーナ部の断面曲率半径よりも大きい肩半径で一方向に絞って、環状の折り曲げ段差を成形し、この折り曲げ段差の内周側または外周側に、前記絞り方向と逆方向に、同じく製品の断面曲率半径よりも大きい肩半径で逆絞りし、前記折り曲げ段差と逆向きの環状の折り曲げ段差を成形して、この２つの折り曲げ段差でハット形断面を、前記屈曲コーナ部の断面曲率半径が製品寸法よりも大きくなるように予備成形するものとし、前記仕上げ成形を前記折り曲げ工程以降に行い、前記屈曲コーナ部の最小板厚を素材板厚の７５％以上としたことを特徴とするスラスト針状ころ軸受用保持器の製造方法。A blanking process for punching an annular blank from a raw steel plate, a hat-shaped section forming process for forming an intermediate annular portion of the punched blank into a hat-shaped section, and a bending process for forming annular folding steps on both inner and outer peripheral sides of the blank; a folding step of folding the outside of the respective folding steps, said intermediate annular portion, a plurality of pockets for housing the needle rollers have a pocket punching step of punching out at equal intervals in the circumferential direction, the hat-shaped cross section forming For thrust needle roller bearings, the process is divided into pre-molding in which the cross-section length along the cross-sectional center line of the hat-shaped cross section is longer than the product dimensions, and finish molding in which the hat-shaped cross section is formed to be equal to the product dimensions . the method of manufacturing a retainer, a means for preforming the hat-shaped cross-section in the hat-shaped cross-section forming step, the punched-out blanks, said The product is squeezed in one direction with a shoulder radius larger than the cross-section curvature radius of the bent corner of the hat-shaped cross section of the product to form an annular folding step, and on the inner or outer side of this folding step, the direction opposite to the drawing direction is reversed. In the direction, reverse drawing is performed with a shoulder radius that is also larger than the cross-sectional curvature radius of the product, an annular bending step opposite to the bending step is formed, and the hat-shaped cross section is formed by the two bending steps into the bent corner portion. the cross-sectional radius of curvature shall preformed to be larger than the product size, performs the finish forming after the folding process, and the minimum thickness of the bent corner portion and a material thickness of 75% or more on A method for producing a thrust needle roller bearing retainer.
JP02042899A 1999-01-28 1999-01-28 Cage for thrust needle roller bearing and method for manufacturing the same Expired - Lifetime JP3933336B2 (en)

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EP1724480A4 (en) 2004-02-25 2009-04-29 Ntn Toyo Bearing Co Ltd Thrust needle bearing
JP2005240867A (en) * 2004-02-25 2005-09-08 Ntn Corp Thrust needle bearing
JP4606128B2 (en) * 2004-11-11 2011-01-05 宇都宮機器株式会社 Method for manufacturing roller bearing cage
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US7896558B2 (en) 2006-06-06 2011-03-01 Ntn Corporation Thrust roller bearing
JP4668862B2 (en) * 2006-07-18 2011-04-13 Ｎｔｎ株式会社 Thrust roller bearing manufacturing method
JP2009156393A (en) * 2007-12-27 2009-07-16 Ntn Corp Retainer for roller bearing, and needle roller bearing
JP2009156392A (en) * 2007-12-27 2009-07-16 Ntn Corp Cage for roller bearing, needle roller bearing, and method for manufacturing cage for roller bearing
JP5346471B2 (en) * 2008-01-08 2013-11-20 Ｎｔｎ株式会社 Needle roller bearing
CN101910659B (en) 2007-12-27 2015-06-03 Ntn株式会社 Retainer for roller bearing and needle roller bearing
JP2009156389A (en) * 2007-12-27 2009-07-16 Ntn Corp Cage for roller bearing and needle roller bearing
JP5346465B2 (en) * 2007-12-27 2013-11-20 Ｎｔｎ株式会社 Roller bearing cage and needle roller bearing
DE102008004033B4 (en) * 2008-01-11 2012-05-31 Schaeffler Technologies Gmbh & Co. Kg Cage for rolling elements
JP5049143B2 (en) * 2008-01-21 2012-10-17 Ｎｔｎ株式会社 Connecting rod large end support structure and motorcycle engine
JP5064252B2 (en) * 2008-01-29 2012-10-31 Ｎｔｎ株式会社 Idler support structure and transmission
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CN112412985B (en) * 2019-08-20 2022-09-02 上银科技股份有限公司 Retainer and bearing

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