JP6631066B2 - Method for manufacturing cage for radial needle bearing - Google Patents

Method for manufacturing cage for radial needle bearing Download PDF

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JP6631066B2
JP6631066B2 JP2015146996A JP2015146996A JP6631066B2 JP 6631066 B2 JP6631066 B2 JP 6631066B2 JP 2015146996 A JP2015146996 A JP 2015146996A JP 2015146996 A JP2015146996 A JP 2015146996A JP 6631066 B2 JP6631066 B2 JP 6631066B2
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賢 蜂須賀
賢 蜂須賀
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Description

本発明は、ラジアルニードル軸受用保持器の製造方法に関し、より詳細には、例えば、複数のニードルを回転自在に保持する金属製のラジアルニードル軸受用保持器の製造方法に関する。 The present invention relates to a method of manufacturing a cage for a radial needle bearing, and more particularly, for example, a method of manufacturing a metallic radial needle bearing retainer for rotatably holding a plurality of needles.

従来、ギヤの内周面と動力伝達軸の外周面との間等、大きなラジアル荷重を支承しつつ高速で回転する回転支持部にはラジアルニードル軸受が多用されている。例えば、自動車用変速機に用いられるプラネタリギヤ機構では、ラジアルニードル軸受がピニオンギヤと、キャリアに固定するシャフトとの間に配置されるプラネタリピニオンが設けられている。   2. Description of the Related Art Conventionally, radial needle bearings are frequently used for a rotary support portion that rotates at high speed while supporting a large radial load, such as between an inner peripheral surface of a gear and an outer peripheral surface of a power transmission shaft. For example, in a planetary gear mechanism used for an automobile transmission, a planetary pinion in which a radial needle bearing is disposed between a pinion gear and a shaft fixed to a carrier is provided.

ラジアルニードル軸受に適用される金属製保持器は、軸方向両端部に、互いに同心且つ平行に配置された１対のリム部と、両リム部同士の間に掛け渡された状態で、円周方向に間欠的に設けられた複数本の柱部とを備え、金属板に塑性加工及び打ち抜き加工を施すことで形成されている（特許文献１及び２参照。）。   A metal cage applied to a radial needle bearing has a pair of rims arranged concentrically and parallel to each other at both ends in the axial direction, and a pair of rims extending between the two rims. It is provided with a plurality of pillars provided intermittently in the direction, and is formed by subjecting a metal plate to plastic working and punching (see Patent Documents 1 and 2).

例えば、金属製保持器１００は、図７に示すように、金属板の幅方向両端縁部を同方向に折り曲げることで形成されるリム部１０１と、軸方向中央部の内径側部分１０２、内径側部分１０２の両外側に形成される外径側部分１０３、及び内径側部分１０２と外径側部分１０３とを連続させる連結部１０４を有する柱部１０５と、を備える。そして、保持器１００は、円周方向に隣り合う柱部１０５と両リム部１０１とによって、ニードルを回転自在に保持するポケットを画成している。   For example, as shown in FIG. 7, the metal retainer 100 includes a rim portion 101 formed by bending both ends in the width direction of the metal plate in the same direction, an inner diameter side portion 102 at a central portion in the axial direction, and an inner diameter portion 102. An outer diameter side portion 103 formed on both outer sides of the side portion 102 and a pillar portion 105 having a connecting portion 104 that connects the inner diameter side portion 102 and the outer diameter side portion 103 are provided. The retainer 100 defines a pocket that rotatably holds the needle by the pillar portion 105 and the two rim portions 101 that are adjacent in the circumferential direction.

特開２００９−４１７５７号公報JP 2009-41757 A 特許第３８２６９８６号公報Japanese Patent No. 326986

ところで、近年、プラネタリピニオンにおいては、軽量化や複列化によりラジアルニードル軸受の小型化、特に幅狭化が強く要望されている。軸受の幅狭化には、組み込まれる保持器の幅狭化が必須要件となる。
図７に示す金属製保持器１００は、ポケットからニードルが脱落することを防止するため、ピッチ円よりも径方向内方でニードルを保持する内径側部分１０２の幅Ｗ１、及びピッチ円よりも径方向外方でニードルを保持する外径側部分１０３の幅Ｗ２を、所定寸法以上に確保する必要がある。また、内径側部分１０２と連結部１０４とのなす角度θは、金属製保持器１００の加工上の制約から、所定の角度より大きな角度（例えば、１０５°以上）に設定される必要である。このため、従来の加工方法によると、連結部１０４の軸方向幅Ｗ３の最小値が決まり、製作可能な金属製保持器１００の最小幅Ｗが制限されて、保持器１００の幅狭化が困難であった。また、特許文献１及び２に記載の保持器においても、保持器の小型化については考慮されていない。 By the way, in recent years, in planetary pinions, there has been a strong demand for a radial needle bearing to be reduced in size, particularly in width, by reducing the weight and increasing the number of rows. In order to reduce the width of the bearing, it is essential to reduce the width of the cage to be incorporated.
The metal retainer 100 shown in FIG. 7 has a width W1 of the inner diameter side portion 102 that holds the needle radially inward of the pitch circle and a diameter of the metal retainer 100 smaller than the pitch circle in order to prevent the needle from falling off the pocket. It is necessary to secure the width W2 of the outer diameter side portion 103 that holds the needle outward in the direction to a predetermined dimension or more. In addition, the angle θ formed between the inner diameter side portion 102 and the connecting portion 104 needs to be set to an angle larger than a predetermined angle (for example, 105 ° or more) due to processing restrictions of the metal cage 100. For this reason, according to the conventional processing method, the minimum value of the axial width W3 of the connecting portion 104 is determined, and the minimum width W of the metal cage 100 that can be manufactured is limited, and it is difficult to narrow the width of the cage 100. Met. Also, in the cages described in Patent Literatures 1 and 2, downsizing of the cage is not considered.

本発明は、前述した課題に鑑みてなされたものであり、その目的は、従来の加工では困難であった幅狭化が可能なラジアルニードル軸受用保持器の製造方法を提供することにある。 The present invention has been made in view of the problems described above, and it is desirable in conventional processing to provide a method of manufacturing a width narrowing capable radial needle bearing cage was difficult.

本発明の上記目的は、下記の構成により達成される。
（１） 軸方向両端部に互いに平行に配置され、それぞれが円輪状の１対のリム部と、
前記１対のリム部間に掛け渡されて円周方向に間欠的に設けられた複数本の柱部と、
を備え、円周方向に隣り合う前記柱部と前記両リム部とによって、ニードルを保持するポケットを画成し、
前記柱部は、軸方向中央部で、軸方向に延びる内径側部分と、前記内径側部分の軸方向外側で、軸方向に延びる１対の外径側部分と、前記内径側部分と１対の前記外径側部分とをそれぞれ連続させる１対の連結部と、を有するラジアルニードル軸受用保持器の製造方法であって、
帯状の金属板を塑性加工することで、金属板の幅方向両端部を略垂直に折り曲げて形成された１対の予備リム部と、前記幅方向両端部間に長尺方向に亘ってそれぞれ形成される、予備内径側部分、１対の予備外径側部分、及び１対の予備連結部と、を有する第１中間素材を形成する工程と、
前記第１中間素材に所定の間隔で複数の予備ポケットを打ち抜き、前記予備ポケットと前記柱部とが長尺方向に関して交互に連続した第２中間素材を形成する工程と、
前記第２中間素材を所定の長さに切断して単位中間素材を形成する工程と、
前記単位中間素材を円筒状に曲げ形成して円筒状中間素材を形成する工程と、
前記円筒状中間素材の円周方向両端縁同士を溶接する工程と、
を備え、
前記第２中間素材を形成する工程以降において、前記予備内径側部分と前記予備連結部とのなす角度が前記第１中間素材を形成した際の所定の角度よりも小さくなるように、前記予備連結部を折り曲げる工程を更に備え、
前記予備連結部を折り曲げる工程は、前記１対の予備リム部を軸方向内方に押し込むことで、前記予備連結部を折り曲げることを特徴とするラジアルニードル軸受用保持器の製造方法。
（２） 前記予備内径側部分と前記予備連結部とのなす角度が９０°以下となるように、前記予備連結部を折り曲げることを特徴とする（１）に記載のラジアルニードル軸受用保持器の製造方法。 The above object of the present invention is achieved by the following configurations.
( 1 ) a pair of rims arranged in parallel with each other at both ends in the axial direction, each having a ring shape;
A plurality of pillars which are provided between the pair of rims and are provided intermittently in the circumferential direction;
With the pillar portion and both rim portions adjacent in the circumferential direction, a pocket for holding a needle is defined,
The pillar portion has a central portion in the axial direction, an inner diameter portion extending in the axial direction, a pair of outer diameter portions extending in the axial direction outside the inner diameter portion, and a pair of the inner diameter portion. And a pair of connecting portions for making the outer diameter side portion continuous with each other, and a method of manufacturing a retainer for a radial needle bearing, comprising:
A pair of spare rims formed by bending the both ends in the width direction of the metal plate substantially vertically by plastically processing the band-shaped metal plate, and a pair of spare rims formed between both ends in the width direction in the longitudinal direction, respectively. Forming a first intermediate material having a preliminary inner diameter side portion, a pair of preliminary outer diameter side portions, and a pair of preliminary connection portions,
Punching a plurality of spare pockets at predetermined intervals in the first intermediate material, and forming a second intermediate material in which the spare pockets and the pillars are alternately continuous in a longitudinal direction;
Cutting the second intermediate material to a predetermined length to form a unit intermediate material;
A step of bending the unit intermediate material into a cylindrical shape to form a cylindrical intermediate material,
Welding the two circumferential edges of the cylindrical intermediate material,
With
After the step of forming the second intermediate material, the preliminary connection is performed such that an angle formed between the preliminary inner diameter side portion and the preliminary connection portion is smaller than a predetermined angle when the first intermediate material is formed. Further comprising a step of bending the part,
The method for manufacturing a retainer for a radial needle bearing, wherein the step of bending the preliminary connection portion includes bending the preliminary connection portion by pushing the pair of preliminary rim portions inward in the axial direction.
( 2 ) The radial needle bearing retainer according to ( 1 ), wherein the preliminary connection portion is bent so that an angle between the preliminary inner diameter side portion and the preliminary connection portion is 90 ° or less. Production method.

また、本発明のラジアルニードル軸受用保持器の製造方法によれば、１対の予備リム部、予備内径側部分、１対の予備外径側部分、及び１対の予備連結部を有する第１中間素材に対して、所定の間隔で複数の窓部を打ち抜いて第２中間素材を形成する工程以降において、予備内径側部分と予備連結部とのなす角度が、第１中間素材を形成した際の所定の角度よりも小さくなるように予備連結部を折り曲げる工程を更に備える。また、この予備連結部を折り曲げる工程は、１対の予備リム部を軸方向内方に押し込むことで、予備連結部を折り曲げる。これにより、従来製作が困難であった、幅狭のラジアルニードル軸受用保持器を容易に製作することができる。 According to the method of manufacturing a retainer for a radial needle bearing of the present invention, the first having a pair of spare rim portions, a spare inner diameter side portion, a pair of spare outer diameter side portions, and a pair of spare connection portions. After the step of forming a second intermediate material by punching a plurality of windows at predetermined intervals with respect to the intermediate material, the angle formed between the preliminary inner diameter side portion and the preliminary connecting portion is determined when the first intermediate material is formed. The method further comprises the step of bending the preliminary connection portion so as to be smaller than the predetermined angle. In the step of bending the preliminary connection portion, the preliminary connection portion is bent by pushing the pair of preliminary rim portions inward in the axial direction. This makes it possible to easily manufacture a narrow radial needle bearing retainer, which was conventionally difficult to manufacture.

（ａ）は、本発明に係るラジアルニードル軸受用保持器の斜視図であり、（ｂ）は、保持器の断面図である。(A) is a perspective view of the radial needle bearing retainer according to the present invention, and (b) is a cross-sectional view of the retainer. 図１のラジアルニードル軸受用保持器の製造手順を示す説明図である。It is explanatory drawing which shows the manufacturing procedure of the retainer for radial needle bearings of FIG. （ａ）は第２中間素材の要部平面図、（ｂ）は断面図である。(A) is a main part plan view of a second intermediate material, and (b) is a cross-sectional view. （ａ）は左右からリム部を押圧して内径側部分と連結部とのなす角度が小さくなるように連結部を折り曲げる状態を示す説明図、（ｂ）は内径側部分と連結部とのなす角度が９０°に折り曲げ形成された単位中間素材の断面図である。(A) is an explanatory view showing a state in which the connecting portion is bent so as to reduce the angle formed between the inner diameter side portion and the connecting portion by pressing the rim portion from the left and right, and (b) shows the connecting portion between the inner diameter side portion and the connecting portion. It is sectional drawing of the unit intermediate raw material bent and formed in the angle of 90 degrees. 内径側部分と連結部とのなす角度が９０°より小さく形成された変形例のラジアルニードル軸受用保持器の断面図である。It is sectional drawing of the retainer for radial needle bearings of the modification which formed the angle which an inside diameter side part and a connection part make smaller than 90 degrees. （ａ）は、他の変形例の単位中間素材の断面図、（ｂ）は更に他の変形例の単位中間素材の断面図である。(A) is sectional drawing of the unit intermediate material of another modification, (b) is sectional drawing of the unit intermediate material of another modification. 従来のラジアルニードル軸受用保持器の断面図である。It is sectional drawing of the conventional retainer for radial needle bearings.

以下、本発明に係るラジアルニードル軸受用保持器の一実施形態を図面に基づいて詳細に説明する。
図１に示すように、本実施形態のラジアルニードル軸受用保持器１０は、軸方向両端部に互いに平行に配置され、それぞれが円輪状の１対のリム部２０と、１対のリム部２０間に掛け渡されて円周方向に間欠的に設けられた複数本の柱部３０と、を備える。そして、円周方向に隣り合う柱部３０、３０と両リム部２０，２０とで、ニードル（図示せず）を回転自在に保持するポケット４０を画成している。 Hereinafter, an embodiment of a radial needle bearing retainer according to the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the radial needle bearing retainer 10 of the present embodiment is arranged at both ends in the axial direction in parallel with each other, each of which has a pair of annular rims 20 and a pair of rims 20. And a plurality of pillars 30 interposed therebetween and provided intermittently in the circumferential direction. The column portions 30 and 30 and the two rim portions 20 and 20 that are circumferentially adjacent to each other define a pocket 40 that rotatably holds a needle (not shown).

各柱部３０は、軸方向中央且つ径方向内側に形成される内径側部分３１と、軸方向両端部且つ径方向外側でリム部２０に連続して形成される１対の外径側部分３２と、内径側部分３１と１対の外径側部分３２とを連続させる１対の連結部３３と、を有する。内径側部分３１と１対の外径側部分３２とは、それぞれ軸方向に延びて形成されている。   Each pillar portion 30 has an inner diameter side portion 31 formed in the center in the axial direction and radially inward, and a pair of outer diameter side portions 32 formed continuously with the rim portion 20 at both axial end portions and the radially outer side. And a pair of connecting portions 33 for connecting the inner diameter side portion 31 and the pair of outer diameter side portions 32 to each other. The inner diameter side portion 31 and the pair of outer diameter side portions 32 are formed to extend in the axial direction, respectively.

柱部３０は、周方向に隣り合う内径側部分３１同士の間隔、及び外径側部分３２同士の間隔が、それぞれニードルの外径よりも小さくなっている。内径側部分３１は、ニードルのピッチ円よりも径方向内方でニードルを保持し、外径側部分３２は、ニードルのピッチ円よりも径方向外方でニードルを保持する。これにより、ポケット４０からのニードルの脱落が防止される。また、内径側部分３１及び１対の外径側部分３２は、ニードルの脱落防止に必要な最小幅Ｗ１、Ｗ２をそれぞれ有している。
なお、内径側部分３１及び１対の外径側部分３２において、円周方向両側に突出して設けられる抜け止め部は、ニードルを保持可能な形状であれば、任意に設計される。 In the column portion 30, the interval between the inner diameter side portions 31 adjacent in the circumferential direction and the interval between the outer diameter side portions 32 are smaller than the outer diameter of the needle. The inner diameter side portion 31 holds the needle radially inward of the needle pitch circle, and the outer diameter side portion 32 holds the needle radially outward of the needle pitch circle. This prevents the needle from dropping out of the pocket 40. The inner diameter side portion 31 and the pair of outer diameter side portions 32 have minimum widths W1 and W2 necessary for preventing the needle from dropping off, respectively.
In the inner diameter side portion 31 and the pair of outer diameter side portions 32, the retaining portions protruding from both sides in the circumferential direction are arbitrarily designed as long as they can hold the needle.

ここで、本実施形態のラジアルニードル軸受用保持器１０では、図１（ｂ）に示すように、内径側部分３１と連結部３３とのなす角度θ２が９０°になるように設計されている。このように設計されたラジアルニードル軸受用保持器１０は、ニードルの脱落防止に必要な内径側部分３１の最小幅Ｗ１及び外径側部分３２の最小幅Ｗ２を確保しつつ、連結部３３の軸方向幅Ｗ３を保持器１０の板厚まで狭くすることができ、ラジアルニードル軸受用保持器１０の幅Ｗ４を大幅に短縮することができる。   Here, in the radial needle bearing retainer 10 of the present embodiment, as shown in FIG. 1B, the angle θ2 between the inner diameter side portion 31 and the connecting portion 33 is designed to be 90 °. . The radial needle bearing retainer 10 designed as described above secures the minimum width W1 of the inner diameter side portion 31 and the minimum width W2 of the outer diameter side portion 32 necessary for preventing the needle from dropping, while maintaining the shaft of the connecting portion 33. The width W3 in the direction can be reduced to the plate thickness of the retainer 10, and the width W4 of the retainer 10 for a radial needle bearing can be significantly reduced.

次に、ラジアルニードル軸受用保持器１０の製造方法について、図２〜図４を参照して説明する。   Next, a method for manufacturing the retainer 10 for a radial needle bearing will be described with reference to FIGS.

図２は、ラジアルニードル軸受用保持器１０の製造手順を示す概略図であり、先ず、図２（ａ）に示すように、長尺素材である金属製帯板（コイル材）の幅方向両端部を略垂直に折り曲げて１対の予備リム部２０Ａを形成すると共に、１対の予備リム部２０Ａの間に、柱部３０の内径側部分３１となる予備内径側部分３１Ａ、１対の外径側部分３２となる１対の予備外径側部分３２Ａ、及び１対の連結部３３となる１対の予備連結部３３Ａを塑性加工して、第１中間素材１０Ａを作成する。   FIG. 2 is a schematic view showing a manufacturing procedure of the radial needle bearing retainer 10. First, as shown in FIG. 2A, both ends in the width direction of a long metal strip (coil material). The portions are bent substantially vertically to form a pair of spare rim portions 20A, and between the pair of spare rim portions 20A, a spare inner diameter side portion 31A serving as the inner diameter side portion 31 of the pillar portion 30 and a pair of outer rim portions. The first intermediate material 10A is created by plastically processing a pair of preliminary outer diameter side portions 32A to be the radial side portions 32 and a pair of preliminary connecting portions 33A to be a pair of connecting portions 33.

次いで、図２（ｂ）に示すように、第１中間素材１０Ａに、複数の窓部４０Ａを所定の間隔で打ち抜いて第２中間素材１０Ｂを作成する。なお、窓部４０Ａは、ラジアルニードル軸受用保持器１０の完成時に、ポケット４０となる。   Next, as shown in FIG. 2B, a plurality of windows 40A are punched at predetermined intervals in the first intermediate material 10A to form a second intermediate material 10B. The window 40A becomes the pocket 40 when the radial needle bearing retainer 10 is completed.

複数の窓部４０Ａの打抜きにより、図３に示すように、隣り合う窓部４０Ａ間に予備柱部３０Ａが形成される。予備柱部３０Ａは、幅方向中央に一段低く形成された予備内径側部分３１Ａと、予備内径側部分３１Ａより一段高く位置し、予備内径側部分３１Ａの両外側に、予備リム部２０Ａに連続して形成された１対の予備外径側部分３２Ａと、予備内径側部分３１Ａと予備外径側部分３２Ａとを連続させる１対の予備連結部３３Ａと、を有する。   By punching the plurality of windows 40A, as shown in FIG. 3, a spare column 30A is formed between the adjacent windows 40A. The spare pillar portion 30A is located at one step lower than the spare inner diameter portion 31A at the center in the width direction, and is located one step higher than the spare inner diameter portion 31A, and is continuous with the spare rim portion 20A on both outer sides of the spare inner diameter portion 31A. And a pair of preliminary connection portions 33A that connect the preliminary inner diameter side portion 31A and the preliminary outer diameter side portion 32A to each other.

予備内径側部分３１Ａ及び予備外径側部分３２Ａの幅Ｗ１，Ｗ２は、ニードルがポケット４０から脱落することを防止するのに必要な所定の幅より長くなっている。予備連結部３３Ａの長さ（長尺方向）Ｂ１は、予備内径側部分３１Ａの長さＢ２及び予備外径側部分３２Ａの長さＢ３よりも僅かに狭くなっている。また、予備内径側部分３１Ａと予備連結部３３Ａとのなす角度θ１は、窓部４０Ａの打ち抜き作業を容易にするため、所定の角度より大きな角度、例えば、最小で１０５°になっている。   The widths W1 and W2 of the spare inner diameter side portion 31A and the spare outer diameter side portion 32A are longer than predetermined widths necessary to prevent the needle from dropping out of the pocket 40. The length (long direction) B1 of the preliminary connection portion 33A is slightly smaller than the length B2 of the preliminary inner diameter side portion 31A and the length B3 of the preliminary outer diameter side portion 32A. In addition, the angle θ1 between the preliminary inner diameter side portion 31A and the preliminary connection portion 33A is an angle larger than a predetermined angle, for example, 105 ° at a minimum in order to facilitate the work of punching the window 40A.

そして、図２（ｃ）に示すように、複数の窓部４０Ａが連続形成された長尺の第２中間素材１０Ｂを、ラジアルニードル軸受用保持器１０に必要な所定の長さで切断して単位中間素材１０Ｃを作成する。   Then, as shown in FIG. 2C, the long second intermediate material 10B in which the plurality of windows 40A are continuously formed is cut into a predetermined length required for the radial needle bearing retainer 10. A unit intermediate material 10C is created.

次いで、図２（ｄ）及び図４に示すように、単位中間素材１０Ｃの予備リム部２０Ａを両側から押圧して予備連結部３３Ａを折り曲げ、予備内径側部分３１Ａと予備連結部３３Ａとのなす角度θ２が、単位中間素材１０Ｃにおける予備内径側部分３１Ａと予備連結部３３Ａとのなす角度θ１より小さくなるように形成する（θ２＜θ１）。   Next, as shown in FIGS. 2D and 4, the preliminary rim portion 20A of the unit intermediate material 10C is pressed from both sides to bend the preliminary connection portion 33A, thereby forming the preliminary inner diameter side portion 31A and the preliminary connection portion 33A. The angle θ2 is formed so as to be smaller than the angle θ1 formed between the preliminary inner diameter side portion 31A of the unit intermediate material 10C and the preliminary connection portion 33A (θ2 <θ1).

これにより、図４（ａ）に示す予備連結部３３Ａの軸方向幅Ｗ３は、折り曲げ加工することで、保持器１０の板厚まで狭めることができるので、折り曲げ加工前のラジアルニードル軸受用保持器１０の幅Ｗ０を、幅Ｗ４まで短くすることができる。   Thereby, the axial width W3 of the preliminary connection portion 33A shown in FIG. 4A can be reduced to the plate thickness of the retainer 10 by bending, so that the radial needle bearing retainer before the bending process is performed. 10, the width W0 can be reduced to the width W4.

なお、予備連結部３３Ａの折り曲げ加工の際、図４（ａ）に示すように、予備内径側部分３１Ａの外面を外型５１で押えながら予備連結部３３Ａを折り曲げ加工することで安定した加工が可能となる。また、予備連結部３３Ａの折り曲げ加工は、予備内径側部分３１Ａの内面を内型５２で押えながら加工するようにしてもよい。   At the time of bending the preliminary connection portion 33A, as shown in FIG. 4A, stable processing is performed by bending the preliminary connection portion 33A while pressing the outer surface of the preliminary inner diameter side portion 31A with the outer mold 51. It becomes possible. The bending of the preliminary connection portion 33A may be performed while the inner surface of the preliminary inner diameter side portion 31A is pressed by the inner mold 52.

次いで、図２（ｅ）に示すように、所定の長さに切断され、幅Ｗが短くされた単位中間素材１０Ｄを、円筒状に曲げ形成して円筒状中間素材１０Ｅとし、更に、図２（ｆ）に示すように、互いに当接する円周方向両端縁１１同士を溶接する。その後、両リム部２０の両外側面、及び外径面などを研磨して所定の寸法に仕上げた後、浸炭窒化処理などによる熱処理、更にバリ取り加工を施してラジアルニードル軸受用保持器１０が完成する。   Next, as shown in FIG. 2E, a unit intermediate material 10D cut to a predetermined length and having a reduced width W is formed into a cylindrical shape by bending into a cylindrical intermediate material 10E. As shown in (f), the circumferential edges 11 that are in contact with each other are welded to each other. Thereafter, both outer surfaces and outer diameter surfaces of both rim portions 20 are polished and finished to predetermined dimensions, and then subjected to heat treatment such as carbonitriding, and further to deburring, so that the radial needle bearing retainer 10 is formed. Complete.

なお、上記説明では、長尺の第２中間素材１０Ｂを所定の長さで切断して単位中間素材１０Ｃとした後、リム部２０を両側から押圧して、角度θ２＝９０°となるように予備連結部３３Ａを折り曲げたが、この予備連結部３３Ａを折り曲げ加工は、単位中間素材１０Ｃの成形後に限定されず、複数の窓部４０Ａを所定の間隔で連続して打ち抜いて第２中間素材１０Ｂとした後（図２（ｂ）相当）であれば、任意のタイミングで行うことができる。例えば、図２（ｂ）に示す長尺の第２中間素材１０Ｂの両リム部２０を押圧してもよく、円筒状中間素材１０Ｅに成形した後（図２（ｅ）参照）、或いは、円筒状中間素材１０Ｅの円周方向両端縁１１同士を溶接した後（図２（ｆ）参照）に設定してもよい。   In the above description, the long second intermediate material 10B is cut into a predetermined length to form the unit intermediate material 10C, and then the rim portion 20 is pressed from both sides so that the angle θ2 becomes 90 °. The preliminary connecting portion 33A is bent, but the bending of the preliminary connecting portion 33A is not limited to the process after forming the unit intermediate material 10C, and the plurality of windows 40A are continuously punched at predetermined intervals to form the second intermediate material 10B. (Equivalent to FIG. 2 (b)) can be performed at any timing. For example, the two rim portions 20 of the long second intermediate material 10B shown in FIG. 2B may be pressed, and after being formed into a cylindrical intermediate material 10E (see FIG. 2E), or It may be set after welding the circumferential edges 12 of the intermediate material 10E (see FIG. 2 (f)).

以上説明したように、本実施形態のラジアルニードル軸受用保持器１０によれば、柱部３０は、軸方向中央部で軸方向に延びる内径側部分３１と、内径側部分３１の軸方向外側で軸方向に延びる１対の外径側部分３２と、内径側部分３１と１対の外径側部分３２とをそれぞれ連続させる１対の連結部３３と、を有し、内径側部分３１と連結部３３とのなす角度θが、９０°であるので、ニードルの脱落防止に必要な内径側部分３１の幅Ｗ１及び外径側部分３２の幅Ｗ２を確保しつつ、ラジアルニードル軸受用保持器１０の幅狭化が可能となる。   As described above, according to the radial needle bearing retainer 10 of the present embodiment, the pillar portion 30 has the inner diameter side portion 31 extending in the axial direction at the axial center portion and the inner diameter side portion 31 in the axial direction outside of the inner diameter side portion 31. It has a pair of outer diameter side portions 32 extending in the axial direction, and a pair of connecting portions 33 for connecting the inner diameter side portion 31 and the pair of outer diameter side portions 32 respectively, and is connected to the inner diameter side portion 31. Is 90 °, the width W1 of the inner diameter side portion 31 and the width W2 of the outer diameter side portion 32 necessary for preventing the needle from dropping are secured, and the radial needle bearing retainer 10 is secured. Can be narrowed.

また、本実施形態のラジアルニードル軸受用保持器の製造方法によれば、１対の予備リム部２０Ａ、予備内径側部分３１Ａ、１対の予備外径側部分３２Ａ、及び１対の予備連結部３３Ａを有する第１中間素材１０Ａを形成する工程と、第１中間素材１０Ａに所定の間隔で複数の窓部４０Ａを打ち抜いて第２中間素材１０Ｂを形成する工程と、第２中間素材１０Ｂを所定の長さに切断して単位中間素材１０Ｃを形成する工程と、単位中間素材１０Ｃを円筒状に曲げ形成して円筒状中間素材１０Ｅを形成する工程と、円筒状中間素材１０Ｅの円周方向両端縁１１同士を溶接する工程と、を備える。そして、第２中間素材１０Ｂを形成する工程以降において、予備内径側部分３１Ａと予備連結部３３Ａとのなす角度θ２が、第１中間素材１０Ａを形成した際の所定の角度θ１よりも小さくなるように、予備連結部３３Ａを折り曲げる工程を更に備えるので、従来製作が困難であった、幅狭のラジアルニードル軸受用保持器１０を容易に製作することができる。   Further, according to the method for manufacturing a cage for a radial needle bearing of the present embodiment, a pair of spare rim portions 20A, a spare inner diameter side portion 31A, a pair of spare outer diameter side portions 32A, and a pair of spare connection portions. A step of forming a first intermediate material 10A having 33A, a step of punching a plurality of windows 40A in the first intermediate material 10A at predetermined intervals to form a second intermediate material 10B, and a step of forming a second intermediate material 10B Forming the unit intermediate material 10C by cutting the intermediate intermediate material 10C into a cylindrical shape, forming the cylindrical intermediate material 10E by bending the unit intermediate material 10C into a cylindrical shape, and forming both ends in the circumferential direction of the cylindrical intermediate material 10E. Welding the edges 11 to each other. Then, after the step of forming the second intermediate material 10B, the angle θ2 formed between the preliminary inner diameter side portion 31A and the preliminary connecting portion 33A is smaller than the predetermined angle θ1 when the first intermediate material 10A is formed. In addition, since the method further includes a step of bending the preliminary connection portion 33A, the narrow radial needle bearing retainer 10 which was conventionally difficult to manufacture can be easily manufactured.

尚、本発明は、前述した実施形態に限定されるものではなく、適宜、変形、改良、等が可能である。   It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved.

図５は、変形例のラジアルニードル軸受用保持器１０ａの断面図であり、内径側部分３１と連結部３３とのなす角度θ２が９０°以下となっている。この場合、連結部３３の軸方向幅Ｗ３によるラジアルニードル軸受用保持器１０の幅Ｗ５の増加分を保持器１０の板厚以下、さらには、マイナスにまでできる（図５では、Ｗ３＝０）。したがって、ニードルの脱落防止に必要な内径側部分３１及び外径側部分３２の幅Ｗ１，Ｗ２を確保しつつ、連結部３３の軸方向幅Ｗ３を保持器１０の板厚以下、或いは、内径側部分３１の幅Ｗ１と外径側部分３２の幅Ｗ２とを軸方向でオーバーラップさせて、ラジアルニードル軸受用保持器１０の幅Ｗ５を更に小さくすることができる。   FIG. 5 is a cross-sectional view of a radial needle bearing retainer 10a according to a modification, in which the angle θ2 between the inner diameter side portion 31 and the connecting portion 33 is 90 ° or less. In this case, the increase in the width W5 of the radial needle bearing retainer 10 due to the axial width W3 of the connecting portion 33 can be made equal to or less than the plate thickness of the retainer 10 and even to minus (W3 = 0 in FIG. 5). . Accordingly, while securing the widths W1 and W2 of the inner diameter side portion 31 and the outer diameter side portion 32 necessary for preventing the needle from dropping, the axial width W3 of the connecting portion 33 is equal to or less than the plate thickness of the retainer 10 or the inner diameter side. By making the width W1 of the portion 31 and the width W2 of the outer diameter side portion 32 overlap in the axial direction, the width W5 of the radial needle bearing retainer 10 can be further reduced.

また、図６（ａ）に示すように、予備連結部３３Ａの折り曲げ加工を容易にするため、単位中間素材１０Ｃ１において、内径側部分３１と連結部３３との接続部、及び外径側部分３２と連結部３３との接続部に、それぞれ肉盗み部３４，３５が設けられてもよい。   In addition, as shown in FIG. 6A, in order to facilitate bending of the preliminary connection portion 33A, in the unit intermediate material 10C1, a connection portion between the inner diameter side portion 31 and the connection portion 33 and an outer diameter side portion 32 are provided. The meat stealing portions 34 and 35 may be provided at the connecting portions between the and the connecting portion 33, respectively.

さらに、図６（ｂ）に示すように、予備連結部３３Ａの折り曲げ加工を容易にするため、単位中間素材１０Ｃ２において、連結部３３、内径側部分３１、及び外径側部分３２の各板厚をそれぞれ異ならせるようにしてもよい。   Further, as shown in FIG. 6 (b), in order to facilitate bending of the preliminary connection portion 33A, in the unit intermediate material 10C2, the respective plate thicknesses of the connection portion 33, the inner diameter side portion 31, and the outer diameter side portion 32 are provided. May be different from each other.

１０ ラジアルニードル軸受用保持器
１０Ａ 第１中間素材
１０Ｂ 第２中間素材
１０Ｃ 単位中間素材
１０Ｅ 円筒状中間素材
１１ 円周方向両端縁
２０ リム部
２０Ａ 予備リム部
３０ 柱部
３１ 内径側部分
３１Ａ 予備内径側部分
３２ 外径側部分
３２Ａ 予備外径側部分
３３ 連結部
３３Ａ 予備連結部
４０ ポケット
４０Ａ 窓部
Ｗ ラジアルニードル軸受用保持器の幅
θ１ 予備内径側部分と予備連結部とのなす角度
θ２ 内径側部分と連結部とのなす角度 10 Radial Needle Bearing Cage 10A First Intermediate Material 10B Second Intermediate Material 10C Unit Intermediate Material 10E Cylindrical Intermediate Material 11 Both Circumferential Edges 20 Rim 20A Preliminary Rim 30 Column 31 Internal Diameter Side 31A Spare Internal Diameter Part 32 Outside diameter side part 32A Preliminary outside diameter side part 33 Connecting part 33A Preliminary connection part 40 Pocket 40A Window W Width of radial needle bearing retainer θ1 Angle θ2 between the preparatory inner diameter part and the preliminary connection part θ2 Inner diameter part Angle between the cable and the connecting part

Claims (2)

軸方向両端部に互いに平行に配置され、それぞれが円輪状の１対のリム部と、
前記１対のリム部間に掛け渡されて円周方向に間欠的に設けられた複数本の柱部と、
を備え、円周方向に隣り合う前記柱部と前記両リム部とによって、ニードルを保持するポケットを画成し、
前記柱部は、軸方向中央部で、軸方向に延びる内径側部分と、前記内径側部分の軸方向外側で、軸方向に延びる１対の外径側部分と、前記内径側部分と１対の前記外径側部分とをそれぞれ連続させる１対の連結部と、を有するラジアルニードル軸受用保持器の製造方法であって、
帯状の金属板を塑性加工することで、金属板の幅方向両端部を略垂直に折り曲げて形成された１対の予備リム部と、前記幅方向両端部間に長尺方向に亘ってそれぞれ形成される、予備内径側部分、１対の予備外径側部分、及び１対の予備連結部と、を有する第１中間素材を形成する工程と、
前記第１中間素材に所定の間隔で複数の予備ポケットを打ち抜き、前記予備ポケットと前記柱部とが長尺方向に関して交互に連続した第２中間素材を形成する工程と、
前記第２中間素材を所定の長さに切断して単位中間素材を形成する工程と、
前記単位中間素材を円筒状に曲げ形成して円筒状中間素材を形成する工程と、
前記円筒状中間素材の円周方向両端縁同士を溶接する工程と、
を備え、
前記第２中間素材を形成する工程以降において、前記予備内径側部分と前記予備連結部とのなす角度が前記第１中間素材を形成した際の所定の角度よりも小さくなるように、前記予備連結部を折り曲げる工程を更に備え、
前記予備連結部を折り曲げる工程は、前記１対の予備リム部を軸方向内方に押し込むことで、前記予備連結部を折り曲げることを特徴とするラジアルニードル軸受用保持器の製造方法。 A pair of rims arranged parallel to each other at both ends in the axial direction, each having a ring shape;
A plurality of pillars which are provided between the pair of rims and are provided intermittently in the circumferential direction;
With the pillar portion and both rim portions adjacent in the circumferential direction, a pocket for holding a needle is defined,
The pillar portion has a central portion in the axial direction, an inner diameter portion extending in the axial direction, a pair of outer diameter portions extending in the axial direction outside the inner diameter portion, and a pair of the inner diameter portion. And a pair of connecting portions for making the outer diameter side portion continuous with each other, and a method of manufacturing a retainer for a radial needle bearing, comprising:
A pair of spare rims formed by bending the both ends in the width direction of the metal plate substantially vertically by plastically processing the band-shaped metal plate, and a pair of spare rims formed between both ends in the width direction in the longitudinal direction, respectively. Forming a first intermediate material having a preliminary inner diameter side portion, a pair of preliminary outer diameter side portions, and a pair of preliminary connection portions,
Punching a plurality of spare pockets at predetermined intervals in the first intermediate material, and forming a second intermediate material in which the spare pockets and the pillars are alternately continuous in a longitudinal direction;
Cutting the second intermediate material to a predetermined length to form a unit intermediate material;
A step of bending the unit intermediate material into a cylindrical shape to form a cylindrical intermediate material,
Welding the two circumferential edges of the cylindrical intermediate material,
With
After the step of forming the second intermediate material, the preliminary connection is performed such that an angle formed between the preliminary inner diameter side portion and the preliminary connection portion is smaller than a predetermined angle when the first intermediate material is formed. Further comprising a step of bending the part,
The method for manufacturing a retainer for a radial needle bearing, wherein the step of bending the preliminary connection portion includes bending the preliminary connection portion by pushing the pair of preliminary rim portions inward in the axial direction. 前記予備内径側部分と前記予備連結部とのなす角度が９０°以下となるように、前記予備連結部を折り曲げることを特徴とする請求項１に記載のラジアルニードル軸受用保持器の製造方法。 Wherein as the angle of the pre inner diameter side portion and the preliminary coupling portion becomes 90 ° or less, the production method of the cage for the radial needle bearing according to claim 1, characterized in that folding the preliminary coupling portion.
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