JP2013151955A - Rolling bearing cage and rolling bearing - Google Patents

Rolling bearing cage and rolling bearing Download PDF

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Publication number
JP2013151955A
JP2013151955A JP2012012041A JP2012012041A JP2013151955A JP 2013151955 A JP2013151955 A JP 2013151955A JP 2012012041 A JP2012012041 A JP 2012012041A JP 2012012041 A JP2012012041 A JP 2012012041A JP 2013151955 A JP2013151955 A JP 2013151955A
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Prior art keywords
roller bearing
planetary gear
rolling bearing
cage
gear mechanism
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JP2012012041A
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Japanese (ja)
Inventor
Tsutomu Sato
努 佐藤
Takeshi Saito
剛 齋藤
Takenobu Inaba
武信 稲葉
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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
    • F16C33/46—Cages for rollers or needles
    • F16C33/56—Selection of substances
    • F16C33/565—Coatings
    • 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
    • F16C33/4605—Details of interaction of cage and race, e.g. retention or centring
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts
    • 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

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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)

Abstract

PROBLEM TO BE SOLVED: To provide a needle rolling bearing further enhanced in the rigidity of a rolling bearing cage, excellent in durability in even a high-speed high-load environment, and particularly suitable for a planetary gear of a planetary gear mechanism.SOLUTION: A rolling bearing cage has an annular part and a plurality of columns extending from the annular part in the axial direction, and holds rollers between the adjacent columns. The rolling bearing cage has, on its outside diameter face, an electroless nickel plating membrane containing boron. There is also provided a rolling bearing having the rolling bearing cage.

Description

本発明はころ軸受に関し、特に遊星歯車機構の遊星歯車を回転自在に支持するのに適した針状ころ軸受に関する。また、本発明は、このようなころ軸受に使用される保持器に関する。   The present invention relates to a roller bearing, and more particularly to a needle roller bearing suitable for rotatably supporting a planetary gear of a planetary gear mechanism. The present invention also relates to a cage used for such a roller bearing.

車両等に搭載されている自動変速機において、一般的には遊星歯車機構が用いられている。ここで、針状ころ軸受は、細径のころを用いていることから、内輪外径と外輪内径との差が小さいスペースにも収めることができるので、遊星歯車機構の遊星歯車を回転自在に支持するために用いると、それを搭載した自動変速機のコンパクト化に寄与するので好ましいといえる。   In an automatic transmission mounted on a vehicle or the like, a planetary gear mechanism is generally used. Here, since the needle roller bearing uses a small diameter roller, it can be accommodated in a space where the difference between the inner ring outer diameter and the outer ring inner diameter is small, so that the planetary gear of the planetary gear mechanism can be rotated freely. It is preferable to use it for supporting because it contributes to the compactness of the automatic transmission on which it is mounted.

ところで、近年は、燃費の向上などを目的として、自動変速機においても多段化される傾向がある。しかるに、現在は４速が主流である自動変速機を、例えば５速或いは６速に多段化しようとすると、動力を伝達する遊星歯車機構の遊星歯車の自転速度及び公転速度が増大するということがある。このような仕様の変化に伴い、保持器を用いないいわゆる総ころと呼ばれる従来の針状ころ軸受に対し、より低摩擦且つ潤滑性に優れた保持器付きの針状ころ軸受が開発されている。   By the way, in recent years, there is a tendency to increase the number of stages in an automatic transmission for the purpose of improving fuel consumption. However, if the automatic transmission, which is currently in the 4th speed, is to be multistaged, for example, to the 5th or 6th speed, the rotation speed and revolution speed of the planetary gear of the planetary gear mechanism that transmits power increases. is there. Along with such changes in specifications, needle roller bearings with cages have been developed that have lower friction and better lubricity than conventional needle roller bearings called so-called full rollers that do not use cages. .

ここで、遊星歯車機構において、遊星歯車は自転しながら太陽歯車の周囲を公転しているが、このとき遊星歯車を支持する針状ころ軸受も自転すると共に、太陽歯車の周囲を公転するので、特に公転による遠心力が針状ころ軸受に付与されることとなる。従って、針状ころ軸受を保持器付きのものとした場合、保持器は、公転に基づく遠心力により外輪（遊星歯車内周面）に対して押しつけられるため、外輪と保持器との間で摺動が生じることとなる。このような摺動は、針状ころ軸受の引きずり抵抗を増大させる他、早期摩耗や異常発熱、さらには保持器の変形などを招く恐れがある。   Here, in the planetary gear mechanism, the planetary gear revolves around the sun gear while rotating, but at this time the needle roller bearing supporting the planetary gear also rotates and revolves around the sun gear. In particular, centrifugal force due to revolution is applied to the needle roller bearing. Therefore, when the needle roller bearing is provided with a cage, the cage is pressed against the outer ring (inner peripheral surface of the planetary gear) by centrifugal force based on revolution, so that the sliding between the outer ring and the cage is performed. Movement will occur. Such sliding increases the drag resistance of the needle roller bearing, and may cause premature wear, abnormal heat generation, and deformation of the cage.

これに対し特許文献１では、保持器の外径面に、フッ素樹脂を分散させた無電解ニッケル被膜を形成することで、保持器ポケットの案内面ところとの接触による局部摩耗を抑制している。また、特許文献２のように、リン酸マンガン被膜等を形成して耐摩耗性を付与することも行われている。   On the other hand, in Patent Document 1, local wear due to contact with the guide surface of the cage pocket is suppressed by forming an electroless nickel coating in which a fluororesin is dispersed on the outer diameter surface of the cage. . Moreover, like patent document 2, forming a manganese phosphate film etc. and giving abrasion resistance is also performed.

特開２００４−３４０２７０号公報JP 2004-340270 A 特開２００９−２１００８４号公報JP 2009-210084 A

しかしながら、特許文献１、２に記載されている被膜は硬度が低く、更に特許文献１に記載の被膜では、フッ素樹脂が油を弾き易いため潤滑油の保持能力も十分とはいえず、高速回転に対応できないおそれがある。   However, the coatings described in Patent Documents 1 and 2 have low hardness, and in the coating described in Patent Document 1, the fluororesin easily repels the oil, so the holding ability of the lubricating oil cannot be said to be sufficient, and the coating rotates at high speed. May not be able to handle

そこで本発明は、ころ軸受用保持器の更なる強化を図り、高速高負荷環境においても耐久性に優れ、特に遊星歯車機構の遊星歯車用として適した針状ころ軸受を提供することを目的とする。   Accordingly, the present invention aims to provide a needle roller bearing which is further enhanced in a roller bearing cage and has excellent durability even in a high-speed and high-load environment, and particularly suitable for a planetary gear of a planetary gear mechanism. To do.

上記課題を解決するために本発明は、下記に示すころ軸受用保持器及びころ軸受を提供する。
（１）環状部と前記環状部から軸線方向に延在する複数の柱部とを有し、隣接する前記柱部間でころを保持するころ軸受用保持器であって、外径面に、ホウ素を含有する無電解ニッケルメッキ被膜を形成したことを特徴とするころ軸受用保持器。
（２）ホウ素を含有する無電解ニッケルメッキ被膜を形成した面の算術平均粗さＲａが０．２μｍ以下であることを特徴とする上記（１）記載のころ軸受用保持器。
（３）上記（１）または（２）記載のころ軸受用保持器を備えることを特徴とするころ軸受。
（４）遊星歯車機構の遊星歯車支持用である針状ころ軸受であることを特徴とする上記（３）記載のころ軸受。 In order to solve the above problems, the present invention provides a roller bearing retainer and a roller bearing shown below.
(1) A roller bearing retainer having an annular portion and a plurality of column portions extending in the axial direction from the annular portion, and holding rollers between the adjacent column portions, A roller bearing retainer comprising an electroless nickel plating film containing boron.
(2) The roller bearing retainer as described in (1) above, wherein the arithmetic average roughness Ra of the surface on which the electroless nickel plating film containing boron is formed is 0.2 μm or less.
(3) A roller bearing comprising the roller bearing cage according to (1) or (2).
(4) The roller bearing according to (3) above, which is a needle roller bearing for supporting the planetary gear of the planetary gear mechanism.

本発明のころ軸受用保持器では、外径面を被覆するホウ素を含有する無電解ニッケルメッキ被膜が油との親和性に優れるため、潤滑油が不足となる高速回転時でも潤滑不良による焼付きを防止する。また、ホウ素を含有する無電解ニッケルメッキ被膜は、フッ素樹脂を分散させた無電解ニッケル被膜や、リン酸マンガン被膜と比べて硬度が高く、耐摩耗性にも優れる。   In the roller bearing retainer of the present invention, the electroless nickel plating film containing boron covering the outer diameter surface has excellent affinity with oil, so seizure due to poor lubrication even at high speed rotation where the lubricating oil is insufficient To prevent. Moreover, the electroless nickel plating film containing boron has higher hardness and excellent wear resistance than the electroless nickel film in which a fluororesin is dispersed or the manganese phosphate film.

また、本発明のころ軸受は耐久性に優れ、高速回転にも十分対応可能であり、特に遊星歯車機構の遊星歯車支持用として好適である。   Further, the roller bearing of the present invention is excellent in durability and can sufficiently cope with high-speed rotation, and is particularly suitable for supporting a planetary gear of a planetary gear mechanism.

針状ころ軸受を含む車両の自動変速機の断面図である。It is sectional drawing of the automatic transmission of the vehicle containing a needle roller bearing. 遊星歯車機構４の分解図である。4 is an exploded view of the planetary gear mechanism 4. FIG. 遊星歯車機構の作動原理を示す図である。It is a figure which shows the operating principle of a planetary gear mechanism. 針状ころ軸受を遊星歯車機構に組み込んだ状態を示す図である。It is a figure which shows the state which integrated the needle roller bearing in the planetary gear mechanism. 針状ころ軸受における保持器の斜視図である。It is a perspective view of the holder | retainer in a needle roller bearing.

以下、本発明に関して図面を参照して詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to the drawings.

図１は、針状ころ軸受を含む車両の自動変速機１の断面図である。図１において、エンジンのクランクシャフト２から出力されるトルクは、トルクコンバータ３を介して伝達され、更に複数列組み合わせれた遊星歯車機構４，５，６等を介して複数段に減速され、その後デファレンシャルギヤ７及びドライブシャフト８を介して、不図示の車輪に出力されるようになっている。   FIG. 1 is a sectional view of an automatic transmission 1 for a vehicle including a needle roller bearing. In FIG. 1, torque output from the crankshaft 2 of the engine is transmitted through a torque converter 3 and further decelerated to a plurality of stages through a plurality of planetary gear mechanisms 4, 5, 6, etc. The power is output to a wheel (not shown) via the differential gear 7 and the drive shaft 8.

図２は、遊星歯車機構４（５，６も原則的に同じ）の分解図である。図２において、遊星歯車機構４は、内歯を有するリングギヤ４ａと、外歯を有する太陽歯車４ｂと、リングギヤ４ａ及び太陽歯車４ｂに噛合する３つの遊星歯車４ｃと、３つのピニオンシャフト４ｅにより遊星歯車４ｃを回転自在に支持すると共に、自らも回転可能なキャリヤ４ｄとを有する。   FIG. 2 is an exploded view of the planetary gear mechanism 4 (5 and 6 are basically the same). In FIG. 2, the planetary gear mechanism 4 includes a ring gear 4a having internal teeth, a sun gear 4b having external teeth, three planetary gears 4c meshing with the ring gear 4a and the sun gear 4b, and three pinion shafts 4e. The gear 4c is rotatably supported, and has a carrier 4d that can also rotate.

遊星歯車機構４の作動原理を図３に示す。まず、１速の場合、図３（ａ）に示すように、太陽歯車４ｂをドライブ側とし、遊星歯車４ｃ（キャリヤ）をドリブン側とし、リングギヤ４ａを固定することで、大きな減速比が得られる。次に、２速の場合、図３（ｂ）に示すように、太陽歯車４ｂを固定し、遊星歯車４ｃ（キャリヤ）をドリブン側とし、リングギヤ４ａをドライブ側とすることで、中程度の減速比が得られる。更に、３速の場合、図３（ｃ）に示すように、太陽歯車４ｂを固定し、遊星歯車４ｃ（キャリヤ）をドライブ側とし、リングギヤ４ａをドリブン側とすることで、小さな減速比が得られる。尚、後退の場合、図３（ｄ）に示すように、太陽歯車４ｂをドリブン側とし、遊星歯車４ｃ（キャリヤ）を固定し、リングギヤ４ａをドライブ側とすることで、入力に対して出力を逆転させることができる。なお、以上は遊星歯車機構４の動作の一例を示すものであり、必ずしもかかる動作に限られることはない。   The operating principle of the planetary gear mechanism 4 is shown in FIG. First, in the case of the first speed, as shown in FIG. 3A, a large reduction ratio can be obtained by setting the sun gear 4b to the drive side, the planetary gear 4c (carrier) to the driven side, and fixing the ring gear 4a. . Next, in the case of the second speed, as shown in FIG. 3 (b), the sun gear 4b is fixed, the planetary gear 4c (carrier) is set to the driven side, and the ring gear 4a is set to the drive side. A ratio is obtained. Further, in the case of the third speed, as shown in FIG. 3 (c), the sun gear 4b is fixed, the planetary gear 4c (carrier) is set to the drive side, and the ring gear 4a is set to the driven side, thereby obtaining a small reduction ratio. It is done. In the case of reverse, as shown in FIG. 3 (d), the sun gear 4b is driven, the planetary gear 4c (carrier) is fixed, and the ring gear 4a is driven, so that output is output with respect to the input. Can be reversed. In addition, the above shows an example of the operation of the planetary gear mechanism 4, and the operation is not necessarily limited to this operation.

図４は、針状ころ軸受を遊星歯車機構に組み込んだ状態を示す図である。図４に示すように、針状ころ軸受１０は、ピニオンシャフト（内輪）４ｅと遊星歯車（外輪）４ｃとの間に配置され、遊星歯車４ｃを回転自在に支持している。針状ころ軸受１０は、複数のころ１１と、それらを保持する保持器１２とからなっている。ピニオンシャフト４ｅ内には、図４で右方から軸線に沿って延在し、かつ中央で外周面に抜ける油路４ｆが形成されている。保持器１２は外輪案内で用いられる。尚、キャリヤ４ｄと遊星歯車４ｃとの間には、ワッシャ４ｇが配置されている。   FIG. 4 is a view showing a state in which the needle roller bearing is incorporated in the planetary gear mechanism. As shown in FIG. 4, the needle roller bearing 10 is disposed between a pinion shaft (inner ring) 4e and a planetary gear (outer ring) 4c, and rotatably supports the planetary gear 4c. The needle roller bearing 10 includes a plurality of rollers 11 and a cage 12 that holds them. In the pinion shaft 4e, there is formed an oil passage 4f extending along the axis from the right side in FIG. 4 and passing through the outer peripheral surface at the center. The cage 12 is used for outer ring guidance. A washer 4g is disposed between the carrier 4d and the planetary gear 4c.

図５は、針状ころ軸受の保持器の斜視図である。図５に示すように、保持器１２は、一対の環状部１２ａを複数の柱部１２ｂで連結した構成を有している。隣接する柱部１２ｂの間が、ころ１１を保持するポケットとなる。各柱部１２ｂは、軸線方向中央において縮径した（即ち保持器１２の軸線に近接した）縮径部１２ｃを有しており、縮径部１２ｃの軸線方向両側から環状部１２ａにかけて拡径している外径面（図においてダブルハッチングで示す）を、外径案内面（すなわち外輪と摺接する面）１２ｄとしている。このような形状を有する保持器１２をＭ型保持器と呼ぶ。また、保持器１２は、１枚の板材をパンチして柱部を形成し、その後丸めて両端を溶接して製造される。   FIG. 5 is a perspective view of the cage of the needle roller bearing. As shown in FIG. 5, the retainer 12 has a configuration in which a pair of annular portions 12a are connected by a plurality of column portions 12b. A space for holding the rollers 11 is formed between the adjacent column portions 12b. Each column portion 12b has a reduced diameter portion 12c that is reduced in diameter in the center in the axial direction (that is, close to the axial line of the cage 12), and expands from both sides in the axial direction of the reduced diameter portion 12c to the annular portion 12a. The outer diameter surface (indicated by double hatching in the figure) is an outer diameter guide surface (that is, a surface in sliding contact with the outer ring) 12d. The cage 12 having such a shape is called an M-type cage. The cage 12 is manufactured by punching a single plate material to form a pillar portion, and then rounding and welding both ends.

本発明では、保持器１２の外径面１２ｄを、ホウ素を含有する無電解ニッケルメッキ被膜で被覆する。被膜中のホウ素の含有量は１質量％以下が好ましい。ホウ素含有量が１質量％を超えると、靭性が低下し、被膜の割れ等が起こってしまう。   In the present invention, the outer diameter surface 12d of the cage 12 is covered with an electroless nickel plating film containing boron. The boron content in the coating is preferably 1% by mass or less. If the boron content exceeds 1% by mass, the toughness will be reduced, and cracking of the coating will occur.

被膜の表面は、ころとの接触による破損を防止するために平坦であることが好ましく、具体的には算術平均粗さＲａが０．２μｍ以下であることが好ましく、０．１５μｍ以下であることがより好ましい。このような平坦性を実現するためには、被膜形成前の保持器１２の外径面１２ｄを平滑に仕上げたり、あるいは被膜形成後にダイヤモンド砥粒を含有するゴムからなる弾性体研磨粒子を吹き付ける等の処理を行えばよい。後者の処理によれば、表面粗さを小さくできることに加えて保持器１２と被膜との密着性も高まる。   The surface of the coating is preferably flat in order to prevent breakage due to contact with the rollers. Specifically, the arithmetic average roughness Ra is preferably 0.2 μm or less, and is 0.15 μm or less. Is more preferable. In order to achieve such flatness, the outer diameter surface 12d of the cage 12 before film formation is finished smoothly, or elastic abrasive particles made of rubber containing diamond abrasive grains are sprayed after film formation, etc. May be performed. According to the latter treatment, in addition to reducing the surface roughness, the adhesion between the cage 12 and the coating is also increased.

また、被膜の厚さは２μｍ以上が好ましい。被膜の厚みが２μｍ未満では、被膜の耐久性が十分ではなくなる。被膜の厚さの上限は特に制約されないが、被膜処理のコスト、保持器ポケットの寸法精度等を考慮すると、３０μｍ以下が好ましい。   The thickness of the coating is preferably 2 μm or more. When the thickness of the coating is less than 2 μm, the durability of the coating is not sufficient. The upper limit of the thickness of the coating is not particularly limited, but is preferably 30 μm or less in consideration of the cost of coating processing, the dimensional accuracy of the cage pocket, and the like.

尚、無電解メッキ法は慣用の方法に従うことができる。例えば、ニッケル塩及びホウ素化合物からなる還元剤を含むメッキ液に、保持器１２を浸漬して表面に被膜を析出させることにより行うことができる。ニッケル塩としては、塩化ニッケル、硫酸ニッケル、硝酸ニッケル等が使用される。還元剤としては、ジメチルアミノホウ素、ジエチルアミノホウ素、水素化ホウ素ナトリウム等が使用される。更に、次亜リン酸ナトリウム、次亜リン酸ニッケル等のリン化合物や、ヒドラジン、ホルムアルデヒド等の有機還元剤を併せて使用することもできる。特に、リン化合物を併用することは被膜を強固にすることができる。メッキ液の温度は３０〜１００℃、浸漬時間は３〜３００分間とすることができる。   In addition, the electroless plating method can follow a conventional method. For example, it can be performed by immersing the cage 12 in a plating solution containing a reducing agent comprising a nickel salt and a boron compound to deposit a film on the surface. As the nickel salt, nickel chloride, nickel sulfate, nickel nitrate or the like is used. As the reducing agent, dimethylaminoboron, diethylaminoboron, sodium borohydride and the like are used. Furthermore, phosphorus compounds such as sodium hypophosphite and nickel hypophosphite, and organic reducing agents such as hydrazine and formaldehyde can be used in combination. In particular, using a phosphorus compound together can strengthen the coating. The temperature of the plating solution can be 30 to 100 ° C., and the immersion time can be 3 to 300 minutes.

以下に実施例及び比較例を挙げて本発明を更に説明するが、本発明はこれにより何ら制限されるものではない。   Examples The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited thereby.

（実施例１〜６、比較例１〜４）
表１に示すように、無電解メッキ法により、各種被膜を形成した保持器を作製した。そして、作製した保持器について、公転試験機を用いて焼付きまでの時間を計測した。試験条件は下記に示すとおりである。結果を表１に併記するが、被膜を形成してない比較例１に対する相対値で示す。
・キャリア公転数：７５００ｍｉｎ-1
・ピニオン自転数：１００００ｍｉｎ-1
・キャリア公転半径：４０ｍｍ
・潤滑油：ＡＴＦ
・潤滑油供給量：０．０３Ｌ／ｍｉｎ (Examples 1-6, Comparative Examples 1-4)
As shown in Table 1, cages with various coatings were prepared by electroless plating. And about the produced cage, the time until seizure was measured using the revolution test machine. The test conditions are as shown below. Although a result is written together in Table 1, it shows with the relative value with respect to the comparative example 1 which has not formed the film.
・ Number of career revolutions: 7500 min -1
-Number of pinion rotations: 10,000 min -1
・ Carrier revolution radius: 40mm
・ Lubricant: ATF
-Lubricating oil supply amount: 0.03 L / min

Figure 2013151955
Figure 2013151955

表１から、実施例のように本発明に従いホウ素含有ニッケルメッキ被膜を形成した保持器は、ホウ素を含有しない無電解ニッケルメッキ被膜（比較例２）や、リン酸マンガン被膜（比較例３）、フッ素樹脂含有無電解ニッケルメッキ被膜（比較例４）を形成した保持器に比べて焼付き寿命が大幅に延びている。特に、算術表面粗さが０．２μｍ以下である実施例１〜４では、比較例４のフッ素樹脂含有無電解ニッケルメッキ被膜を形成した場合に比べても３倍ほど寿命が延びている。   From Table 1, the cage in which the boron-containing nickel plating film is formed according to the present invention as in the examples is an electroless nickel plating film containing no boron (Comparative Example 2), a manganese phosphate film (Comparative Example 3), The seizure life is greatly extended as compared with the cage in which the fluororesin-containing electroless nickel plating film (Comparative Example 4) is formed. In particular, in Examples 1 to 4 in which the arithmetic surface roughness is 0.2 μm or less, the life is extended by about three times compared to the case where the fluororesin-containing electroless nickel plating film of Comparative Example 4 is formed.

また、実施例１〜４と、実施例５〜６とを比較すると、算術表面粗さを０．２μｍ以下にすると焼付き寿命が倍以上延びており、被膜をより平坦にすることが好ましいことがわかる。   Moreover, when Examples 1-4 are compared with Examples 5-6, when the arithmetic surface roughness is 0.2 μm or less, the seizure life is more than doubled, and it is preferable to make the coating more flat. I understand.

１ 自動変速機
４〜６ 遊星歯車機構
１０ 針状ころ軸受
１１ ころ
１２ 保持器 DESCRIPTION OF SYMBOLS 1 Automatic transmission 4-6 Planetary gear mechanism 10 Needle roller bearing 11 Roller 12 Cage

Claims (4)

環状部と前記環状部から軸線方向に延在する複数の柱部とを有し、隣接する前記柱部間でころを保持するころ軸受用保持器であって、
外径面に、ホウ素を含有する無電解ニッケルメッキ被膜を形成したことを特徴とするころ軸受用保持器。 A roller bearing retainer having an annular portion and a plurality of column portions extending in the axial direction from the annular portion, and holding rollers between the adjacent column portions,
A roller bearing retainer comprising an electroless nickel plating film containing boron formed on an outer diameter surface. ホウ素を含有する無電解ニッケルメッキ被膜を形成した面の算術平均粗さＲａが０．２μｍ以下であることを特徴とする請求項１記載のころ軸受用保持器。   2. The roller bearing retainer according to claim 1, wherein an arithmetic average roughness Ra of the surface on which the electroless nickel plating film containing boron is formed is 0.2 [mu] m or less. 請求項１または２記載のころ軸受用保持器を備えることを特徴とするころ軸受。   A roller bearing comprising the roller bearing retainer according to claim 1. 遊星歯車機構の遊星歯車支持用である針状ころ軸受であることを特徴とする請求項３記載のころ軸受。   4. A roller bearing according to claim 3, wherein the roller bearing is a needle roller bearing for supporting a planetary gear of a planetary gear mechanism.
JP2012012041A 2012-01-24 2012-01-24 Rolling bearing cage and rolling bearing Pending JP2013151955A (en)

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