JP5128216B2 - Cage for needle roller with cage and needle roller with cage - Google Patents

Cage for needle roller with cage and needle roller with cage Download PDF

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JP5128216B2
JP5128216B2 JP2007240988A JP2007240988A JP5128216B2 JP 5128216 B2 JP5128216 B2 JP 5128216B2 JP 2007240988 A JP2007240988 A JP 2007240988A JP 2007240988 A JP2007240988 A JP 2007240988A JP 5128216 B2 JP5128216 B2 JP 5128216B2
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cage
needle roller
needle
roller
column
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JP2009068677A (en
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正範 佐藤
壽貴 長谷川
貴則 寺田
誠 西川
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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
    • F16C33/546—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from a single part with a M- or W-shaped cross section
    • 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
    • F16C33/541—Details of individual pockets, e.g. shape or roller retaining means
    • 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
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F16C19/463—Needle bearings with one row or needles consisting of needle rollers held in a cage, i.e. subunit without race rings
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts

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

Description

この発明は保持器付き針状ころの保持器に関し、トランスミッション用遊星歯車などの高速回転下で使用される保持器付き針状ころに利用することができる。
保持器付き針状ころ（needle roller and cage assembly）は、針状ころを保持器に分離しないように組み付けたもので、ラジアル形とスラスト形があるが、ここではラジアル形を対象とする。 The present invention relates to a cage for a needle roller with a cage, and can be used for a needle roller with a cage used under high-speed rotation of a planetary gear for transmission or the like.
A needle roller and cage assembly is a needle roller and cage assembly that is assembled so as not to be separated into a cage, and there are a radial type and a thrust type. Here, the radial type is targeted.

一般に、自動車のトランスミッションには遊星歯車装置が用いられ、遊星歯車装置の遊星歯車を支持するための軸受として保持器付き針状ころが使用されている。保持器付き針状ころは、多数の針状ころと保持器とで構成され、支持軸の外周面を内側軌道面とし、遊星歯車の内周面を外側軌道面として利用することから、トランスミッションのコンパクト化に寄与している。
特開２００４−２３２７２６号公報 特許第３７３５１６０号公報 特開平１１−５１０６０号公報 Generally, a planetary gear device is used for an automobile transmission, and a needle roller with a cage is used as a bearing for supporting the planetary gear of the planetary gear device. The needle roller with cage is composed of a number of needle rollers and cages, and the outer peripheral surface of the support shaft is used as the inner raceway surface, and the inner peripheral surface of the planetary gear is used as the outer raceway surface. Contributes to downsizing.
JP 2004-232726 A Japanese Patent No. 3735160 Japanese Patent Laid-Open No. 11-51060

トランスミッションなどの遊星歯車に使用される軸受は、ギアからの荷重に加えて、公転運動により遠心力が作用する。このため、高速回転特有の現象として、ころに作用する遠心力が高くなり、ころと保持器が衝突する際の保持器に発生する応力が大きくなり、保持器の強度や耐久性上問題があった。
そこで、この発明の目的は、保持器付き針状ころの保持器の高速回転下における耐久性を向上させることにある。 In a bearing used for a planetary gear such as a transmission, a centrifugal force acts by a revolving motion in addition to a load from the gear. For this reason, as a phenomenon peculiar to high-speed rotation, the centrifugal force acting on the roller is increased, the stress generated in the cage when the roller and the cage collide with each other, and there is a problem in the strength and durability of the cage. It was.
Accordingly, an object of the present invention is to improve the durability of the needle roller with cage under high speed rotation.

ところで、特許文献２には、保持器のポケットの隅に、円周方向に陥入したぬすみを設け、ぬすみ深さをころ径の５％と設定することが記載されている。しかし、この数値では応力低減の効果が十分でないことが判明した。   By the way, Patent Document 2 describes that a corner indented in the circumferential direction is provided at the corner of the cage pocket, and the depth of the depth is set to 5% of the roller diameter. However, it has been found that this value is not sufficient for reducing the stress.

また、特許文献３には、保持器端面方向に陥入したぬすみを設けることが記載されている。ぬすみの陥入が端面方向であれ周方向であれ応力が低減する効果に関する限りは大差ないかもしれないが、特許文献３のものは円すいころ軸受であり、針状ころ軸受とは保持器に作用する荷重が異なる。まず、円すいころ軸受の場合、内輪または外輪でころの軸方向の荷重を受けるため、保持器はころから軸方向の荷重を受けない。そのため、ぬすみを保持器端面側に陥入させても保持器が破損する心配がなく、周方向の荷重が作用した場合の発生応力を低減させることができる。針状ころ軸受、とりわけ保持器付き針状ころの場合、内輪および外輪がないため、保持器はころから軸方向、周方向の荷重を受ける。回転するころが保持器と接触することで、保持器が摩耗するいわゆる「ドリリング摩耗」が発生する。そのため、端面側のストレート部をできるだけ長くしてころと保持器の接触面圧を下げる必要がある。   Japanese Patent Application Laid-Open No. H10-228561 describes providing a dimple that is indented in the direction of the end face of the cage. Although there may not be much difference as far as the effect of reducing stress is applied whether the indentation is in the end face direction or in the circumferential direction, the one of Patent Document 3 is a tapered roller bearing, and the needle roller bearing acts on the cage. Different load. First, in the case of a tapered roller bearing, the cage receives no axial load from the roller because the inner ring or the outer ring receives the axial load of the roller. For this reason, there is no fear that the cage will be damaged even if the dullness is indented into the cage end face side, and the generated stress when a circumferential load is applied can be reduced. In the case of a needle roller bearing, particularly a needle roller with a cage, since there is no inner ring and outer ring, the cage receives axial and circumferential loads from the roller. When the rotating roller comes into contact with the cage, so-called “drilling wear” occurs in which the cage is worn. Therefore, it is necessary to reduce the contact surface pressure between the roller and the cage by making the straight portion on the end face side as long as possible.

この発明は、軸方向に離間した一対の環状部と、円周方向に所定間隔で位置し前記環状部どうしを連結する柱部とからなり、隣り合った柱部間に、四隅に円周方向にのみ陥入した第一のぬすみを設けたポケットを形成し、柱部の軸線方向中央に位置する部分を針状ころのピッチ円の内径側に配置し、柱部の軸線方向両側に位置する部分を針状ころのピッチ円の半径方向外側に配置したＭ型保持器において、前記ポケットの第一のぬすみのぬすみ深さｄ１と最小柱幅Ｐminを、式Ｐmin／５≦ｄ１≦Ｐmin／３が成立するように設定し、かつ、第一のぬすみのぬすみ深さｄ１とぬすみの曲率半径Ｒを、式ｄ１≦Ｒ≦２ｄ１が成立するように設定し、前記柱部の軸線方向中央に位置する部分と前記柱部の軸線方向両側に位置する部分をつなぐ部分に第二のぬすみを形成し、前記柱部の軸線方向中央に位置する部分と前記柱部の軸線方向両側に位置する部分をころ案内部としたことを特徴とするものである。 The present invention comprises a pair of annular portions spaced apart in the axial direction, and pillar portions that are located at a predetermined interval in the circumferential direction and connect the annular portions, and between the adjacent pillar portions, in the circumferential direction at the four corners. A pocket provided with a first fillet that is indented only is formed, and the portion located in the axial center of the column portion is arranged on the inner diameter side of the pitch circle of the needle roller, and is located on both sides in the axial direction of the column portion. In the M-type cage in which the portion is arranged on the radially outer side of the pitch circle of the needle rollers, the depth d1 and the minimum column width Pmin of the first thickness of the pocket are expressed by the formula Pmin / 5 ≦ d1 ≦ Pmin / 3. Is set such that the dull depth d1 of the first dullness and the radius of curvature R of the dullness are set such that the formula d1 ≦ R ≦ 2d1 is satisfied , and is positioned at the axial center of the column portion. 2 Steal is formed, it is characterized in that it has a guide portion roller portion located axially on both sides of the portion between the pillar portion located axially center of the pillar portion.

保持器の応力を下げるには、高い応力が発生するポケットの隅の丸みの曲率半径を大きくすることが有効であるが、設計上ぬすみ深さを大きくしないと曲率半径を大きくすることはできない。しかし、曲率半径を大きくすると最小柱幅の寸法が小さくなり、保持器の強度が落ちることになる。ぬすみ深さ、曲率半径を変えた保持器のＦＥＭ解析を実施し、上記の式を満たす値が、柱強度を確保しつつ、ぬすみ部分に発生する応力を低減できる寸法であることを確認した。   In order to reduce the stress of the cage, it is effective to increase the radius of curvature of the corner of the pocket where high stress is generated. However, the radius of curvature cannot be increased unless the depth of cut is increased. However, when the radius of curvature is increased, the dimension of the minimum column width is reduced, and the strength of the cage is reduced. An FEM analysis of the cage with different thicknesses and curvature radii was performed, and it was confirmed that the value satisfying the above equation was a dimension that could reduce the stress generated in the thinned portion while ensuring the column strength.

保持器付き針状ころは、多数の針状ころと保持器とで構成され、支持軸の外周面を内側軌道面とし、遊星歯車の内周面を外側軌道面として利用するようになっている。一例として、トランスミッション用遊星歯車装置の遊星歯車を支持する軸受として利用することができる。針状ころは、通常、直径が５ｍｍ以下で、端面は平坦面である。   The needle roller with cage is composed of a large number of needle rollers and cages, and the outer peripheral surface of the support shaft is used as the inner raceway surface, and the inner peripheral surface of the planetary gear is used as the outer raceway surface. . As an example, it can be used as a bearing for supporting a planetary gear of a planetary gear device for transmission. Needle rollers usually have a diameter of 5 mm or less and end surfaces are flat surfaces.

この発明によれば、保持器の板厚を増加させることなく柱強度を確保するとともに、ポケットのぬすみ部の局部応力を緩和することができる。したがって、遠心力が増加する高速回転下においても保持器の破損を防ぐことができ、軸受の耐久性が向上する。   According to the present invention, it is possible to secure the column strength without increasing the plate thickness of the cage and to relieve the local stress at the loose portion of the pocket. Therefore, breakage of the cage can be prevented even under high-speed rotation where the centrifugal force increases, and the durability of the bearing is improved.

以下、この発明の実施の形態を図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

まず、保持器付き針状ころの使用例として遊星歯車装置について簡単に述べる。遊星歯車装置は、図４（Ａ）に示すように、内歯を有するリングギア２と、外歯を有する太陽ギア４と、リングギア２および太陽ギア４と噛み合った３つの遊星歯車６と、各遊星歯車６を回転自在に支持するピニオンシャフト８ａをもち自らも回転可能なキャリヤ８とで構成されている。   First, a planetary gear device will be briefly described as an example of use of a needle roller with a cage. As shown in FIG. 4A, the planetary gear device includes a ring gear 2 having internal teeth, a sun gear 4 having external teeth, three planetary gears 6 meshed with the ring gear 2 and the sun gear 4, The planetary gear 6 is constituted by a carrier 8 having a pinion shaft 8a for rotatably supporting the planetary gear 6 and capable of rotating by itself.

図４（Ｂ）に示すように、保持器付き針状ころ１０はピニオンシャフト８aと遊星歯車６の間に組み込んである。保持器付き針状ころ１０は、複数の針状ころ１２と、それらを円周方向に所定間隔に保持する保持器１４とからなり、ピニオンシャフト（内輪）８ａと遊星歯車（外輪）６との間に配置され、遊星歯車６をピニオンシャフト８ａ上に回転自在に支持している。そして、ピニオンシャフト８ａの外周面が針状ころ１２のための内側軌道面となり、遊星歯車６の内周面が針状ころ１２のための外側軌道面となる。ピニオンシャフト８ａの内部には、外部から潤滑油を導くための油路８ｂが形成してある。針状ころ１２は、直径が５ｍｍ以下で、端面は平坦面（図２（Ｃ）および図４（Ｂ）参照）とするほか、種々形状のものが知られている。   As shown in FIG. 4B, the needle roller 10 with a cage is incorporated between the pinion shaft 8a and the planetary gear 6. The needle roller 10 with a cage includes a plurality of needle rollers 12 and a cage 14 that holds them at a predetermined interval in the circumferential direction, and includes a pinion shaft (inner ring) 8 a and a planetary gear (outer ring) 6. The planetary gear 6 is rotatably disposed on the pinion shaft 8a. The outer peripheral surface of the pinion shaft 8 a becomes an inner raceway surface for the needle rollers 12, and the inner peripheral surface of the planetary gear 6 becomes an outer raceway surface for the needle rollers 12. An oil passage 8b for guiding lubricating oil from the outside is formed inside the pinion shaft 8a. Needle rollers 12 have a diameter of 5 mm or less, and end surfaces are flat surfaces (see FIG. 2C and FIG. 4B), and various shapes are known.

保持器１４は、図２に示すように、一対の環状部１６を複数の柱部１８で連結した構成を有している。隣接する柱部１８の間の空間が針状ころ１２を収容するための空間すなわちポケット２０となる。柱部１８の断面形状は概ねＭ字形である（図２（Ｃ））。このような断面形状を有することからこの保持器１４はＭ型保持器と呼ばれる。軸線方向中央に、縮径した、言い換えれば保持器１４の軸芯側に寄った縮径部１８ａを有し、この縮径部１８ａの軸線方向両側から環状部１６にかけての、縮径部１８ａから見て拡径した部分の外周面を案内面１８ｂとしている。つまり、この保持器１４は回転時、遊星歯車６（図４）の内周面で案内されるいわゆる外輪案内で用いられる。   As shown in FIG. 2, the cage 14 has a configuration in which a pair of annular portions 16 are connected by a plurality of column portions 18. A space between adjacent column portions 18 becomes a space for accommodating the needle rollers 12, that is, a pocket 20. The cross-sectional shape of the column portion 18 is generally M-shaped (FIG. 2C). Because of having such a cross-sectional shape, the cage 14 is called an M-type cage. In the center of the axial direction, the diameter is reduced, in other words, it has a reduced diameter portion 18a that is close to the axial center side of the retainer 14, and from the reduced diameter portion 18a that extends from both sides in the axial direction to the annular portion 16 of the reduced diameter portion 18a. The outer peripheral surface of the portion whose diameter has been enlarged when viewed is used as a guide surface 18b. That is, the retainer 14 is used in so-called outer ring guide that is guided by the inner peripheral surface of the planetary gear 6 (FIG. 4) during rotation.

ポケット２０の平面形状は図１に示すとおりである。ポケット２０は、保持器１４の円周方向を短辺、軸方向を長辺とする概ね長方形状で、短辺の長さをポケット幅と呼び、符号ｗはポケット幅寸法を表している。長辺は針状ころ１２の案内をする。ポケット２０の四隅に、円周方向に陥入した曲率半径Ｒのぬすみ２２が形成してあり、符号ｄ１はぬすみ２２の円周方向への寸法すなわちぬすみ深さを表している。長辺には２箇所にぬすみ２４が形成してあり、このぬすみ２４のぬすみ深さもぬすみ２２と同じぬすみ深さｄ１としてある。ぬすみ深さｄ１は柱部１８から見ると最小柱幅を規定し、図１（Ｂ）に示すように符号Ｐminは最小柱幅寸法を表している。つまり、ぬすみ深さｄ１と最小柱幅Ｐminはトレードオフの関係にある。   The planar shape of the pocket 20 is as shown in FIG. The pocket 20 has a generally rectangular shape with the circumferential direction of the cage 14 as the short side and the axial direction as the long side, and the length of the short side is called the pocket width, and the symbol w represents the pocket width dimension. The long side guides the needle roller 12. In the four corners of the pocket 20, there are formed thinnings 22 having a radius of curvature R that are indented in the circumferential direction, and reference numeral d1 represents a circumferential dimension of the thinnings 22, that is, a thinning depth. Nuts 24 are formed at two locations on the long side, and the depth of the dampness 24 is the same as the depth d1 of the dullness 22. The thinning depth d1 defines the minimum column width when viewed from the column part 18, and the symbol Pmin represents the minimum column width dimension as shown in FIG. That is, the thinning depth d1 and the minimum column width Pmin are in a trade-off relationship.

ぬすみ深さｄ１とぬすみ２２の曲率半径Ｒは、次の式（１）を満足するように設定する。
ｄ１ ≦ Ｒ ≦ ２ｄ１ …（１） The thinning depth d1 and the radius of curvature R of the thinning 22 are set so as to satisfy the following expression (1).
d1 ≦ R ≦ 2d1 (1)

また、ぬすみ深さｄ１と最小柱幅Ｐminが式（２）を満たすように設定する。
Ｐmin／５ ≦ ｄ１ ≦ Ｐmin／３ …（２） Further, the thinning depth d1 and the minimum column width Pmin are set so as to satisfy the formula (2).
Pmin / 5 ≦ d1 ≦ Pmin / 3 (2)

式（１）によりぬすみ深さｄ１を大きくすると最小柱幅Ｐminが小さくなり、ぬすみ２２部分の応力が高くなる。そのため、式（２）によりぬすみ２２の曲率半径Ｒを大きく取ることにより、応力を緩和する。ぬすみ深さｄ１が十分でない状態で曲率半径Ｒを大きくしようとすると、針状ころ１２とポケット２０の周壁が干渉するため（図３参照）、ぬすみ深さｄ１の寸法規定が必要となる。   When the thinning depth d1 is increased according to the equation (1), the minimum column width Pmin is reduced, and the stress of the thinning 22 portion is increased. Therefore, the stress is relieved by increasing the radius of curvature R of the fillet 22 according to the equation (2). If the curvature radius R is to be increased in a state where the thinning depth d1 is not sufficient, the peripheral wall of the needle roller 12 and the pocket 20 interferes (see FIG. 3), so that it is necessary to define the thinning depth d1.

ここで、図３（Ａ）はぬすみがまったくない例、図３（Ｂ）はぬすみ２２はあるがぬすみ深さｄ１が小さい場合の例、図３（Ｃ）はぬすみ深さｄ１が大きい場合の例を示している。各図中、実線はポケット２０の輪郭を表し、破線はころの輪郭を表している。   Here, FIG. 3 (A) is an example in which there is no dullness, FIG. 3 (B) is an example in which there is a dullness 22 but the dullness depth d1 is small, and FIG. 3 (C) is a case in which the dullness depth d1 is large. An example is shown. In each figure, the solid line represents the outline of the pocket 20, and the broken line represents the outline of the roller.

以上のようにして、保持器１４の板厚を増加させることなく、柱部１８の強度を確保するとともに、ぬすみ２２の曲率半径Ｒおよびぬすみ２２部分の局部応力を緩和することができる。したがって、遠心力が増加する高速回転下においても保持器１４の破損を防ぐことができ、軸受の耐久性が向上する。   As described above, the strength of the column portion 18 can be secured without increasing the plate thickness of the cage 14, and the curvature radius R of the fillet 22 and the local stress of the fillet 22 portion can be reduced. Therefore, breakage of the cage 14 can be prevented even under high-speed rotation where the centrifugal force increases, and the durability of the bearing is improved.

保持器１４のぬすみ深さｄ１とぬすみ２２の曲率半径Ｒを変えた比較例の保持器と実施例の保持器とについて、高速回転時の強度試験を行なったところ、表１に示すような結果を得た。試験条件は表２に示すとおりである。   When the strength test at high speed rotation was performed on the cage of the comparative example and the cage of the example in which the depth d1 of the cage 14 and the radius of curvature R of the blank 22 were changed, the results shown in Table 1 were obtained. Got. The test conditions are as shown in Table 2.

Figure 0005128216
Figure 0005128216

表１中、応力比とは、ぬすみ深さｄ１：０．３ｍｍ、ぬすみ曲率半径Ｒ：０．５ｍｍの仕様（比較例２）における応力を基準として、それに対する比較例、実施例の保持器の応力の比で、応力比の値が小さい方が保持器強度は高くなる。当該応力は、ポケット２０のぬすみ２２部分で測定した応力を意味する。保持器２０の最大応力が発生する部位すなわち保持器の最弱部がぬすみ２２部分であるため、その部分の応力値を比較したものである。   In Table 1, the stress ratio refers to the stress in the specification (Comparative Example 2) with a fillet depth d1: 0.3 mm and a fillet radius of curvature R: 0.5 mm as a reference. The smaller the stress ratio, the higher the cage strength. The stress means the stress measured at the thinning 22 portion of the pocket 20. Since the portion of the cage 20 where the maximum stress is generated, that is, the weakest portion of the cage is the thinning 22 portion, the stress values of the portion are compared.

Figure 0005128216
Figure 0005128216

表１における比較例１および比較例２ならびに実施例３を使用して、３種類の試験条件で試験を行なった結果、表２に示すように、比較例１および比較例２はいずれの試験条件下でも破損に至った。具体的には、比較例１および比較例２の保持器はどの条件でもポケットのぬすみ部分が破損した。これに対して実施例３の保持器は、比較例１および比較例２が破損した時間と同時間で試験をしても破損せず、継続使用が可能な状態であった。   As a result of performing the test under three kinds of test conditions using Comparative Example 1 and Comparative Example 2 and Example 3 in Table 1, as shown in Table 2, Comparative Example 1 and Comparative Example 2 were in any test condition. Damaged even underneath. Specifically, in the cages of Comparative Examples 1 and 2, the loose portion of the pocket was damaged under any conditions. On the other hand, the cage of Example 3 did not break even when tested in the same time as the time when Comparative Example 1 and Comparative Example 2 were broken, and was in a state where continuous use was possible.

（Ａ）は実施の形態を説明するための保持器のポケットの展開平面図、（Ｂ）は保持器の一部分の展開平面図である。(A) is a development top view of a pocket of a cage for explaining an embodiment, and (B) is a development top view of a part of a cage. （Ａ）は保持器の正面図、（Ｂ）は斜視図、（Ｃ）は保持器付きころの断面図である。(A) is a front view of a cage, (B) is a perspective view, and (C) is a sectional view of a roller with cage. （Ａ）（Ｂ）（Ｃ）はポケットのぬすみ部分の拡大図である。(A), (B), and (C) are enlarged views of a thin portion of a pocket. （Ａ）は遊星歯車装置の略図、（Ｂ）は遊星歯車を支持する軸受部分の断面図である。(A) is a schematic view of a planetary gear device, and (B) is a cross-sectional view of a bearing portion that supports the planetary gear.

符号の説明Explanation of symbols

１０ 保持器付き針状ころ
１２ 針状ころ
１４ 保持器
１６ 環状部
１８ 柱部
２０ ポケット
２２ ぬすみ
２４ ぬすみ DESCRIPTION OF SYMBOLS 10 Needle roller with cage 12 Needle roller 14 Cage 16 Annular part 18 Pillar part 20 Pocket 22 Stuff 24 Stuff

Claims (5)

軸方向に離間した一対の環状部と、円周方向に所定間隔で位置し前記環状部どうしを連結する柱部とからなり、隣り合った柱部間に、四隅に円周方向にのみ陥入した第一のぬすみを設けたポケットを形成し、柱部の軸線方向中央に位置する部分を針状ころのピッチ円の内径側に配置し、柱部の軸線方向両側に位置する部分を針状ころのピッチ円の半径方向外側に配置したＭ型保持器において、前記ポケットの第一のぬすみのぬすみ深さｄ１と最小柱幅Ｐminを、式Ｐmin／５≦ｄ１≦Ｐmin／３が成立するように設定し、かつ、第一のぬすみのぬすみ深さｄ１とぬすみの曲率半径Ｒを、式ｄ１≦Ｒ≦２ｄ１が成立するように設定し、前記柱部の軸線方向中央に位置する部分と前記柱部の軸線方向両側に位置する部分をつなぐ部分に第二のぬすみを形成し、前記柱部の軸線方向中央に位置する部分と前記柱部の軸線方向両側に位置する部分をころ案内部とした保持器付き針状ころ用保持器。 It consists of a pair of annular parts spaced apart in the axial direction and pillars that are located at a predetermined interval in the circumferential direction and connect the annular parts, and is only in the circumferential direction at the four corners between adjacent pillars. The pocket with the first fillet is formed, the part located in the axial center of the column part is arranged on the inner diameter side of the pitch circle of the needle roller, and the part located on both axial sides of the column part is needle-like In the M-type cage arranged on the outer side in the radial direction of the pitch circle of the rollers, the expression Pmin / 5 ≦ d1 ≦ Pmin / 3 is established for the dimple depth d1 and the minimum column width Pmin of the first dimple of the pocket . And the dull depth d1 and the radius of curvature R of the first dull are set so that the formula d1 ≦ R ≦ 2d1 holds , and the portion located in the axial center of the column portion and the Form a second corner at the part connecting the parts located on both sides of the column in the axial direction And, partial a cage with needle holder for rollers and the guide unit roller portion located axially on both sides of the pillar portions located axially center of the pillar portion. 請求項１の保持器を有する保持器付き針状ころ。   A needle roller with a cage having the cage of claim 1. 針状ころの端面がＦ端面である請求項２の保持器付き針状ころ。   The needle roller with a retainer according to claim 2, wherein an end surface of the needle roller is an F end surface. 針状ころの直径が５ｍｍ以下である請求項３の保持器付き針状ころ。   The needle roller with a cage according to claim 3, wherein the diameter of the needle roller is 5 mm or less. トランスミッション用遊星歯車装置用である請求項２から４のいずれか１項の保持器付き針状ころ。   The needle roller with a retainer according to any one of claims 2 to 4, which is for a planetary gear unit for transmission.
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