JP2008232221A - Thrust needle roller bearing - Google Patents

Thrust needle roller bearing Download PDF

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JP2008232221A
JP2008232221A JP2007070819A JP2007070819A JP2008232221A JP 2008232221 A JP2008232221 A JP 2008232221A JP 2007070819 A JP2007070819 A JP 2007070819A JP 2007070819 A JP2007070819 A JP 2007070819A JP 2008232221 A JP2008232221 A JP 2008232221A
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Prior art keywords
needle roller
roller bearing
outer diameter
diameter side
cage
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Hirohisa Mihara
弘久 三原
Makoto Fujinami
誠 藤波
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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
    • 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
    • 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
    • F16C33/34—Rollers; Needles
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/50—Crowning, e.g. crowning height or crowning radius

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust needle roller bearing capable of lengthening the service life, and capable of also reducing weight, by restraining abrasion and seizure by a shortage of an oil film in high speed rotation. <P>SOLUTION: This thrust needle roller bearing 10 has a cage 15 penetrating in the axial direction and having a plurality of pockets 14 formed over in the circumferential direction, and a plurality of needle rollers 13 held to roll in the circumferential direction in the plurality of pockets 14. A recessed part 13d is formed on the end surface side of the needle rollers 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば、自動車や産業機械に用いられるスラスト針状ころ軸受に関し、特に、自動車エアコン用コンプレッサや自動車用トランスミッション等の回転支持部に用いられるスラスト針状ころ軸受に関する。   The present invention relates to a thrust needle roller bearing used for, for example, an automobile or an industrial machine, and more particularly to a thrust needle roller bearing used for a rotation support portion of a compressor for an automobile air conditioner or an automobile transmission.

従来、自動車エアコン用コンプレッサや自動車用トランスミッション等の回転支持部に用いられるスラスト軸受としては、高剛性、高容量、コンパクト等の特徴を有するスラスト針状ころ軸受が使用されることが多い。   Conventionally, thrust needle roller bearings having characteristics such as high rigidity, high capacity, and compactness are often used as thrust bearings used in rotation support portions of compressors for automobile air conditioners and transmissions for automobiles.

スラスト針状ころ軸受は、例えば、軸方向に互いに対向する一対の軌道輪間に、直径が５ｍｍ以下と比較的小さく、長さが直径に比べて３倍以上長い複数の針状ころが配置され、これらの針状ころは、保持器を介してその軸線を径方向に向けた状態で放射状に配置されている。（例えば、特許文献１参照）。   In the thrust needle roller bearing, for example, a plurality of needle rollers having a relatively small diameter of 5 mm or less and a length three times longer than the diameter are arranged between a pair of bearing rings facing each other in the axial direction. These needle rollers are arranged radially with their axes directed in the radial direction via a cage. (For example, refer to Patent Document 1).

さらに、スラスト針状ころ軸受には、自動車の燃費に対する要求の高まりから低トルク化が望まれている。従来のスラスト針状ころ軸受では、回転時に針状ころが遠心力で保持器のポケットの外径側端面に強く押し付けられる傾向にある。ここで、針状ころの面取り部が小さく、ころ端面形状が平面形の場合、針状ころの保持器径方向外側の端面（以下、針状ころの外径側端面という）の外周側に近い部分がポケットの外径側端面と接触することになるので、ころの回転抵抗が大きくなり、また、針状ころの外径側端面とポケットの外径側端面の接触面積も大きくなる。この結果、ころの転がり運動に大きな抑止力が発生し、軸受トルクが増大し、保持器のポケットに異常摩耗が発生する虞がある。   Further, the thrust needle roller bearings are desired to have a low torque due to the increasing demand for automobile fuel efficiency. In conventional thrust needle roller bearings, the needle rollers tend to be strongly pressed against the outer diameter side end face of the cage pocket by centrifugal force during rotation. Here, when the chamfered portion of the needle roller is small and the roller end surface shape is flat, it is close to the outer peripheral side of the end surface of the needle roller in the radial direction of the cage (hereinafter referred to as the outer diameter side end surface of the needle roller). Since the portion comes into contact with the outer diameter side end surface of the pocket, the rotational resistance of the roller increases, and the contact area between the outer diameter side end surface of the needle roller and the outer diameter side end surface of the pocket also increases. As a result, a large deterrent is generated in the rolling motion of the rollers, the bearing torque is increased, and abnormal wear may occur in the cage pocket.

一方、針状ころの端面を丸面形状にすれば、上記問題を回避することができるが、ころ軌道面側の有効長が短くなってしまい、寿命の低下や針状ころの面圧上昇などの問題が懸念される。   On the other hand, if the end surface of the needle roller has a round shape, the above problem can be avoided, but the effective length on the roller raceway surface side is shortened, resulting in a decrease in service life and an increase in the surface pressure of the needle roller. Is concerned about the problem.

これに対して、特許文献１に記載のスラスト針状ころ軸受では、針状ころの端面を平面形のままとし、軌道面側と端面側の面取りサイズを変更することで、ころ有効長を確保しながら、ポケット外周側ところとの接点でのトルク及び異常摩耗を低減させることが考案されている。
特開２００５−９５２６号公報 In contrast, in the thrust needle roller bearing described in Patent Document 1, the end face of the needle roller remains flat, and the effective chamfer size is ensured by changing the chamfer size between the raceway side and the end face side. However, it has been devised to reduce the torque and abnormal wear at the contact point with the outer periphery of the pocket.
Japanese Patent Laid-Open No. 2005-9526

ところで、特許文献１に記載のスラスト針状ころ軸受では、高速回転時にころ端面と保持器の接触面で油膜切れが生じた場合には焼付きに至る可能性があった。また、特許文献１で使用される針状ころは、材料を切断後、端面側に大きな曲面形状を付与すべく、旋削バイトにて大きめの曲面を加工し、ころ研削取り代にてころ端面側の曲面形状をコントロールしているため、量産対応が困難であり、コストが嵩むという問題があった。   By the way, in the thrust needle roller bearing described in Patent Document 1, there is a possibility that seizure may occur when an oil film breakage occurs between the roller end surface and the contact surface of the cage during high-speed rotation. In addition, the needle roller used in Patent Document 1 has a large curved surface processed with a turning tool to give a large curved surface shape to the end surface side after cutting the material, and the roller end surface side with a roller grinding allowance Since the curved surface shape is controlled, it is difficult to deal with mass production and the cost is increased.

本発明は、上記課題に鑑みてなされたものであり、その目的は、高速回転時における油膜切れによる摩耗や焼付きを抑制し、長寿命化を図ることができると共に、軽量化も図れるスラスト針状ころ軸受を提供することにある。   The present invention has been made in view of the above problems, and its purpose is to suppress wear and seizure due to oil film breakage during high-speed rotation, to achieve a long life and to reduce the weight. To provide a tapered roller bearing.

本発明の上記目的は、以下の構成により達成される。
（１） 軸方向に貫通し、円周方向に亙って形成される複数のポケットを備える保持器と、前記複数のポケットに円周方向に転動可能に保持される複数の針状ころと、を有するスラスト針状ころ軸受であって、
前記針状ころの端面側に凹部が形成されることを特徴とするスラスト針状ころ軸受。
（２） 前記針状ころの凹部の最大凹み量が０．００２ｍｍ以上０．０２０ｍｍ以下であることを特徴とする（１）に記載のスラスト針状ころ軸受。
（３） 前記保持器は、その外径側に軸方向に延びる外径側フランジを備え、且つ、
前記各ポケットは、前記針状ころの端面が前記外径側フランジの内周面と当接可能なように、径方向において前記外径側フランジまで延在することを特徴とする（１）又は（２）に記載のスラスト針状ころ軸受。
（４） 前記針状ころは、径方向寸法が軸方向寸法より大きい面取り部を有することを特徴とする（１）〜（３）のいずれかに記載のスラスト針状ころ軸受。 The above object of the present invention is achieved by the following configurations.
(1) A cage having a plurality of pockets penetrating in the axial direction and formed in the circumferential direction, and a plurality of needle rollers held in the plurality of pockets so as to be able to roll in the circumferential direction A thrust needle roller bearing comprising:
A thrust needle roller bearing, wherein a concave portion is formed on an end face side of the needle roller.
(2) The thrust needle roller bearing according to (1), wherein a maximum recess amount of the recess of the needle roller is 0.002 mm or more and 0.020 mm or less.
(3) The cage includes an outer diameter side flange extending in an axial direction on an outer diameter side thereof, and
Each of the pockets extends to the outer diameter side flange in the radial direction so that an end surface of the needle roller can come into contact with an inner peripheral surface of the outer diameter side flange (1) or The thrust needle roller bearing according to (2).
(4) The thrust needle roller bearing according to any one of (1) to (3), wherein the needle roller has a chamfered portion having a radial dimension larger than an axial dimension.

本発明のスラスト針状ころ軸受によれば、針状ころの端面側に凹部が形成されるので、この凹部が油溜りを形成して、高速回転時における油膜切れによる摩耗や焼付きを抑制し、長寿命化を図ることができると共に、軽量化を図ることができる。   According to the thrust needle roller bearing of the present invention, since the concave portion is formed on the end face side of the needle roller, this concave portion forms an oil reservoir and suppresses wear and seizure due to oil film breakage during high speed rotation. In addition, the service life can be extended and the weight can be reduced.

また、針状ころは、上記凹部と、径方向寸法が軸方向寸法より大きい面取り部を有する形状において、タンブラー加工を適用することができ、ころを低コストで且つ、安定的に生産できる。   In addition, the needle roller can be tumbled in the shape having the concave portion and the chamfered portion whose radial dimension is larger than the axial dimension, and the roller can be stably produced at low cost.

以下、本発明の一実施形態に係るスラスト針状ころ軸受について図面を参照して詳細に説明する。   Hereinafter, a thrust needle roller bearing according to an embodiment of the present invention will be described in detail with reference to the drawings.

スラスト針状ころ軸受１０は、例えば、容量可変式のエアコン用コンプレッサに適用される。コンプレッサは、冷媒ガスを圧縮すべくピストンを往復運動させるために斜板を駆動軸と共に回転するが、スラスト針状ころ軸受は、この際に斜板を介して駆動軸に加わるスラスト荷重を支持している。   The thrust needle roller bearing 10 is applied to, for example, a variable capacity air conditioner compressor. The compressor rotates the swash plate with the drive shaft to reciprocate the piston to compress the refrigerant gas, and the thrust needle roller bearing supports the thrust load applied to the drive shaft through the swash plate at this time. ing.

スラスト針状ころ軸受１０は、図１に示すように、軸方向に互いに対向する一対の軌道輪１１，１２と、一対の軌道輪１１，１２間にその軸線を径方向に向けた状態で放射状に配設される複数の針状ころ１３と、軸方向に貫通して、該針状ころ１３を円周方向に転動可能に保持するポケット１４が形成された円環状の保持器１５と、を備える。   As shown in FIG. 1, the thrust needle roller bearing 10 has a pair of raceways 11 and 12 that face each other in the axial direction, and a radial shape with the axis lined in the radial direction between the pair of raceways 11 and 12. A plurality of needle rollers 13 disposed in the ring, and an annular cage 15 formed with pockets 14 penetrating in the axial direction and holding the needle rollers 13 so as to roll in the circumferential direction; Is provided.

図１及び図２に示すように、保持器１５は、円周方向において隣り合うポケット１４間に形成される複数の柱部１６と、内径側及び外径側において軸方向に延びる内径側フランジ１７及び外径側フランジ１８と、を有する。柱部１６の保持器径方向の略中央部には、保持器１５の軸方向一端側に向けて全周に亙って屈曲して形成される屈曲部１９が形成され、保持器１５はM型断面に形成される。屈曲部１９の中間部には、中央平板部２０が形成され、ポケット１４の内周縁となるその円周方向両側面にころ持たせ部２０ａが形成される。   As shown in FIGS. 1 and 2, the cage 15 includes a plurality of column portions 16 formed between pockets 14 adjacent in the circumferential direction, and an inner diameter side flange 17 that extends in the axial direction on the inner diameter side and the outer diameter side. And an outer diameter side flange 18. A bent portion 19 formed by bending over the entire circumference toward one axial end of the cage 15 is formed at a substantially central portion of the pillar portion 16 in the radial direction of the cage. Formed on the mold section. A central flat plate portion 20 is formed at an intermediate portion of the bent portion 19, and a roller holding portion 20 a is formed on both side surfaces in the circumferential direction which are the inner peripheral edge of the pocket 14.

また、柱部１６において、内径側フランジ１７と屈曲部１９との間、及び外径側フランジ１８と屈曲部１９との間には、軸方向他端側に形成された内側平板部２１、外側平板部２２が形成され、ポケット１４の内周縁となるこれらの円周方向両側面にころ持たせ部２１ａ，２２ａが形成される。   Moreover, in the column part 16, between the inner diameter side flange 17 and the bending part 19, and between the outer diameter side flange 18 and the bending part 19, the inner side flat plate part 21 formed on the other end side in the axial direction, the outer side A flat plate portion 22 is formed, and roller holding portions 21 a and 22 a are formed on both sides in the circumferential direction which are the inner peripheral edge of the pocket 14.

これにより、保持器１５は、軸方向両側においてころ持たせ部２０ａ，２１ａ，２２ａによって針状ころ１３に案内される。また、保持器１５は、図３（ａ）及び（ｂ）に示すように、軸方向両側において移動した際、両軌道輪１１，１２との隙間ｇがそれぞれ０．１ｍｍ以上となるようにして針状ころ１３に案内されており、軌道輪１１，１２と保持器１５との摺動抵抗を抑制している。   Thereby, the retainer 15 is guided to the needle rollers 13 by the roller holding portions 20a, 21a, and 22a on both sides in the axial direction. Further, as shown in FIGS. 3A and 3B, when the cage 15 moves on both sides in the axial direction, the clearance g between both the races 11 and 12 is set to 0.1 mm or more. Guided by the needle roller 13, the sliding resistance between the race rings 11, 12 and the cage 15 is suppressed.

さらに、各ポケット１４の外径側端面は、外径側フランジ１８の軸方向中間部に形成されており、各ポケット１４は径方向において前記外径側フランジ１８まで延在している。これにより、回転時に針状ころ１３が遠心力により径方向外側に移動した場合には、針状ころ１３の外径側端面は外径側フランジ１８の内周面１８ａと当接する。   Furthermore, the outer diameter side end surface of each pocket 14 is formed in the axial direction intermediate part of the outer diameter side flange 18, and each pocket 14 is extended to the said outer diameter side flange 18 in radial direction. Thus, when the needle roller 13 moves radially outward due to centrifugal force during rotation, the outer diameter side end surface of the needle roller 13 contacts the inner peripheral surface 18 a of the outer diameter side flange 18.

針状ころ１３は、その外周面を軌道面１３ａとすると共に、該軌道面１３ａと軸方向両端面との間に面取り部１３ｂを形成する。図４に示すように、面取り部１３ｂは、径方向寸法Ａが軸方向寸法Ｂより大きくなるように形成されている。また、針状ころ１３の両端面側には、中央部に凹部１３ｃが形成されており、さらに、面取り部１３ｂと凹部１３ｃとの間には、これらの境界と滑らかに連続する平坦部１３ｄが形成される。なお、針状ころ１３の端面は、この平坦部１３ｄの代わりに、若干湾曲した面であってもよい。   The needle roller 13 has an outer peripheral surface as a raceway surface 13a, and a chamfered portion 13b is formed between the raceway surface 13a and both end surfaces in the axial direction. As shown in FIG. 4, the chamfered portion 13 b is formed such that the radial dimension A is larger than the axial dimension B. In addition, a concave portion 13c is formed in the center portion on both end surface sides of the needle roller 13, and a flat portion 13d that smoothly continues to these boundaries is provided between the chamfered portion 13b and the concave portion 13c. It is formed. Note that the end surface of the needle roller 13 may be a slightly curved surface instead of the flat portion 13d.

これにより、針状ころ１３はころ有効長さを確保しつつ、軸受回転時に針状ころ１３に遠心力が負荷されてポケット１４の外径側に押し付けられた場合にも、その外径側端面の軸心寄りの平坦部１３ｄで保持器１５の外径側フランジ１８の内周面１８ａと当接するので、当接位置での滑り速度を低下し、且つ接触面積を小さくしている。   As a result, the needle roller 13 has an effective roller end length, and even when a centrifugal force is applied to the needle roller 13 during the rotation of the bearing and is pressed against the outer diameter side of the pocket 14, the outer diameter side end surface thereof. Since the flat portion 13d near the axial center contacts the inner peripheral surface 18a of the outer diameter side flange 18 of the retainer 15, the sliding speed at the contact position is reduced and the contact area is reduced.

また、凹部１３ｃは、希薄潤滑下において油溜りとして機能し、高速回転時の油膜切れによる摩耗や焼付きを抑制することができる。凹部１３ｃの最大凹み量は、０．００２ｍｍ以上０．０２０ｍｍ以下に設定されており、０．００２ｍｍより小さいと油溜りとしての効果が小さい。   Further, the recess 13c functions as an oil reservoir under lean lubrication, and can suppress wear and seizure due to oil film breakage during high-speed rotation. The maximum recess amount of the recess 13c is set to 0.002 mm or more and 0.020 mm or less, and if it is less than 0.002 mm, the effect as an oil reservoir is small.

また、軌道面１３ａは、所謂、フルクラウニング加工が施されるが、軸方向中間部分におけるストレート長さＬ１がころ長さＬ２の２０％以下となるように設定されており、軸受回転時に発生する差動滑りを低減させている。なお、面取りは、０．５〜１．０ｍｍ程度の大きさで形成されるのに対して、クラウニングの落ち量は、０．００５〜０．０１５ｍｍ程度の大きさで形成される。   Further, the raceway surface 13a is subjected to so-called full crowning processing, and is set so that the straight length L1 in the intermediate portion in the axial direction is 20% or less of the roller length L2, and is generated when the bearing rotates. Differential slip is reduced. The chamfer is formed with a size of about 0.5 to 1.0 mm, whereas the amount of falling of the crowning is formed with a size of about 0.005 to 0.015 mm.

次に、針状ころ１３及び保持器１５の製造方法について説明する。   Next, a method for manufacturing the needle roller 13 and the cage 15 will be described.

針状ころ１３は、まず、円柱状の棒部材をころ長さに応じて切断する。その後、凹部１３ｃを含む端面形状となるように潰し加工を行なって、素材Ｓを塑性変形させる。この際、図５（ａ）に示すように、素材Ｓの軸方向両端部には張り出し部３０が形成される。この張り出し部３０は大きく湾曲した形状を有するので、その後の研削の際の取り代により面取りをコントロールできる。そして、この張り出し部３０をすり落とすことで除去するタンブラー加工を行ない、図５（ｂ）に示すような面取り部１３ｂを形成する。その後、針状ころ１３は、熱処理が施され、研削或いはバレルによるフルクラウニング加工を行った後、さらにバレルによる仕上げ加工を行なう。なお、フルクラウニング加工時のバレルと仕上げ加工時のバレルとは、加工条件を変えて行なわれる。   The needle roller 13 first cuts a cylindrical bar member according to the roller length. Thereafter, the material S is plastically deformed by crushing so as to have an end face shape including the recess 13c. At this time, as shown in FIG. 5A, overhang portions 30 are formed at both ends of the material S in the axial direction. Since the projecting portion 30 has a greatly curved shape, the chamfering can be controlled by the machining allowance in the subsequent grinding. Then, a tumbler process for removing the overhanging portion 30 by scraping is performed to form a chamfered portion 13b as shown in FIG. 5B. Thereafter, the needle roller 13 is subjected to heat treatment, and after grinding or full crowning with a barrel, further finishing with a barrel is performed. The barrel at the time of full crowning and the barrel at the time of finishing are performed by changing processing conditions.

一方、保持器１５は、一枚の円盤状の薄板をトリミングを行いながらプレス成形によって所望の形状に形成する。また、この工程中、ピアッシングにより、ポケット１４を円周方向に等間隔に打抜く。そして、所定の形状に形成された素材を化学研磨した後、熱処理を行って硬化させる。その後、針状ころ１３を組み込んで組立てを行なった後、検査が行なわれ、完成する。   On the other hand, the cage 15 is formed into a desired shape by press molding while trimming a single disk-shaped thin plate. Further, during this process, the pockets 14 are punched at equal intervals in the circumferential direction by piercing. Then, after the material formed in a predetermined shape is chemically polished, it is cured by heat treatment. Thereafter, the needle roller 13 is assembled and assembled, and then an inspection is performed and completed.

このように構成される本実施形態のスラスト針状ころ軸受１０によれば、針状ころ１３の端面側に凹部１３ｃが形成されるので、この凹部１３ｃが油溜りを形成して、高速回転時における油膜切れによる摩耗や焼付きを抑制し、長寿命化を図ることができると共に、軽量化を図ることができる。   According to the thrust needle roller bearing 10 of the present embodiment configured as described above, since the recess 13c is formed on the end face side of the needle roller 13, the recess 13c forms an oil sump and rotates at a high speed. In addition, it is possible to suppress wear and seizure due to the oil film breakage, and to extend the service life and reduce the weight.

また、針状ころ１３は、凹部１３ｃ、及び径方向寸法が軸方向寸法より大きい面取り部１３ｂを有する形状を、潰し加工及びタンブラー加工によって加工することができ、ころを低コストで且つ、安定的に生産できる。   Moreover, the needle roller 13 can process the shape which has the recessed part 13c and the chamfering part 13b whose radial direction dimension is larger than an axial direction dimension by crushing process and a tumbler process, and a roller is low-cost and stable. Can be produced.

さらに、保持器１５の各ポケット１４は、針状ころ１３の端面が外径側フランジ１８の内周面１８ａと当接可能なように、径方向において外径側フランジ１８まで延在するので、軸受回転時に針状ころ１３に遠心力が負荷されてポケット１４の外径側に押し付けられた場合にも、針状ころ１３は、その外径側端面の平坦部１３ｄで保持器１５の外径側フランジ１８と当接するので、回転トルクを低減することができる。したがって、保持器１５の異常摩耗を防止して長寿命化を図ることができるとともに、低トルク化を図ることができる。   Furthermore, each pocket 14 of the retainer 15 extends to the outer diameter side flange 18 in the radial direction so that the end surface of the needle roller 13 can come into contact with the inner peripheral surface 18a of the outer diameter side flange 18. Even when a centrifugal force is applied to the needle roller 13 during rotation of the bearing and pressed against the outer diameter side of the pocket 14, the needle roller 13 has an outer diameter of the cage 15 at the flat portion 13 d of the outer diameter side end surface. Since it contacts the side flange 18, the rotational torque can be reduced. Therefore, abnormal wear of the cage 15 can be prevented to extend the life, and torque can be reduced.

なお、本発明は、上述した実施形態に限定されるものでなく、適宜、変形、改良等が可能である。
本発明の針状ころの軌道面は、ストレート長さがころ長さの２０％以下となるようにクラウニングが施されればよく、ストレート長さを持たず軸方向全域に亘って曲線形状とするフルクラウニングが施されてもよい。 In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
The raceway surface of the needle roller of the present invention may be crowned so that the straight length is 20% or less of the roller length, and does not have a straight length and has a curved shape over the entire axial direction. Full crowning may be applied.

次に、本発明の針状ころの凹部による効果を確認するため、保持器の摩耗量について試験を行なった。該試験は、２００Ｎのアキシャル荷重が負荷され，１８０００ｍｉｎ−１で回転される、図示しない測定試験機に、希薄潤滑下での試験用軸受を組み込んで行なわれた。試験用軸受としては、面取り部の径方向寸法と軸方向寸法が略等しい従来品と、面取り部１３ｂの径方向寸法が軸方向寸法より大きく、凹部１３ｃの凹み量が０，０．００２，０．０１０，０．０２０ｍｍの参考例及び実施例１〜３を使用した。 Next, in order to confirm the effect of the concave portion of the needle roller of the present invention, the amount of wear of the cage was tested. The test was performed by incorporating a test bearing under lean lubrication into a measurement test machine (not shown) loaded with an axial load of 200 N and rotated at 18000 min −1 . As a test bearing, the radial dimension of the chamfered portion is substantially equal to the axial dimension, and the radial dimension of the chamfered portion 13b is larger than the axial dimension, and the recess amount of the recessed portion 13c is 0, 0.002, 0. Reference examples of .010 and 0.020 mm and Examples 1 to 3 were used.

表１は、その試験結果を示す。この結果、面取り部１３ｂの径方向寸法が軸方向寸法より大きく、凹部１３ｃの凹み量を０．００２ｍｍ以上とすることで，保持器摩耗量は従来品に対して大幅に改善されたことが確認できた。   Table 1 shows the test results. As a result, it was confirmed that the wear amount of the cage was greatly improved compared to the conventional product by making the radial dimension of the chamfered part 13b larger than the axial dimension and making the recessed amount of the recessed part 13c 0.002 mm or more. did it.

Figure 2008232221
Figure 2008232221

本発明の一実施形態に係るスラスト針状ころ軸受の断面図である。It is sectional drawing of the thrust needle roller bearing which concerns on one Embodiment of this invention. 図１の保持器の上面図である。It is a top view of the holder | retainer of FIG. 保持器のころ案内状態を示す断面図で、（ａ）は、保持器が一方の軌道輪側に寄った状態を示し、（ｂ）は、保持器が他方の軌道輪側に寄った状態を示す。It is sectional drawing which shows the roller guide state of a cage | basket, (a) shows the state which the cage | basket approached the one track ring side, (b) shows the state which the cage | basket approached the other track ring side. Show. 図１の針状ころを示す図である。It is a figure which shows the needle roller of FIG. （ａ）は針状ころ切断後の状態を示す図で、（ｂ）は塑性変形及び面取りが行なわれた後の針状ころを示す図である。(A) is a figure which shows the state after needle roller cutting | disconnection, (b) is a figure which shows the needle roller after plastic deformation and chamfering were performed.

符号の説明Explanation of symbols

１０ スラスト針状ころ軸受
１３ 針状ころ
１３ｂ 面取り部
１３ｃ 凹部
１３ｄ 平坦部
１４ ポケット
１５ 保持器
１６ 柱部
１８ 外径側フランジ
１８ａ 内周面 DESCRIPTION OF SYMBOLS 10 Thrust needle roller bearing 13 Needle roller 13b Chamfered part 13c Recessed part 13d Flat part 14 Pocket 15 Cage 16 Pillar part 18 Outer diameter side flange 18a Inner peripheral surface

Claims (4)

軸方向に貫通し、円周方向に亙って形成される複数のポケットを備える保持器と、前記複数のポケットに円周方向に転動可能に保持される複数の針状ころと、を有するスラスト針状ころ軸受であって、
前記針状ころの端面側に凹部が形成されることを特徴とするスラスト針状ころ軸受。 A cage having a plurality of pockets penetrating in the axial direction and formed in the circumferential direction, and a plurality of needle rollers held in the plurality of pockets so as to be able to roll in the circumferential direction. A thrust needle roller bearing,
A thrust needle roller bearing, wherein a concave portion is formed on an end face side of the needle roller. 前記針状ころの凹部の最大凹み量が０．００２ｍｍ以上０．０２０ｍｍ以下であることを特徴とする請求項１に記載のスラスト針状ころ軸受。   2. The thrust needle roller bearing according to claim 1, wherein a maximum recess amount of the recess of the needle roller is 0.002 mm or more and 0.020 mm or less. 前記保持器は、その外径側に軸方向に延びる外径側フランジを備え、且つ、
前記各ポケットは、前記針状ころの端面が前記外径側フランジの内周面と当接可能なように、径方向において前記外径側フランジまで延在することを特徴とする請求項１又は２に記載のスラスト針状ころ軸受。 The cage includes an outer diameter side flange extending in an axial direction on an outer diameter side thereof, and
2. The pocket according to claim 1, wherein each of the pockets extends to the outer diameter side flange in a radial direction so that an end surface of the needle roller can come into contact with an inner peripheral surface of the outer diameter side flange. 2. A thrust needle roller bearing according to 2. 前記針状ころは、径方向寸法が軸方向寸法より大きい面取り部を有することを特徴とする請求項１〜３のいずれかに記載のスラスト針状ころ軸受。   The thrust needle roller bearing according to any one of claims 1 to 3, wherein the needle roller has a chamfered portion having a radial dimension larger than an axial dimension.
JP2007070819A 2007-03-19 2007-03-19 Thrust needle roller bearing Pending JP2008232221A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120019678A (en) * 2010-08-26 2012-03-07 박경철 Needle roller for needle roller bearing and the needle roller manufacture method
JP2015166634A (en) * 2015-06-24 2015-09-24 日本精工株式会社 Manufacturing method of cage for thrust needle bearing
US9939010B2 (en) * 2014-11-18 2018-04-10 Ntn Corporation Thrust roller bearing cage and method for manufacturing the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120019678A (en) * 2010-08-26 2012-03-07 박경철 Needle roller for needle roller bearing and the needle roller manufacture method
US9939010B2 (en) * 2014-11-18 2018-04-10 Ntn Corporation Thrust roller bearing cage and method for manufacturing the same
JP2015166634A (en) * 2015-06-24 2015-09-24 日本精工株式会社 Manufacturing method of cage for thrust needle bearing

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