JP2010065752A

JP2010065752A - Roller bearing

Info

Publication number: JP2010065752A
Application number: JP2008231975A
Authority: JP
Inventors: Tomoaki Kawamura; 智明川村
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2008-09-10
Filing date: 2008-09-10
Publication date: 2010-03-25

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the fall-off from the cage solid lubricating compositions filled in bearing spaces on both sides of a cage. <P>SOLUTION: Columnar portions 2a of the cylindrical retainer 2 each have a hole 6 as a through portion passing through both sides. The solid lubricating compositions 5 to be filled in the holes 6 are filled in the retainer 2 on both outer and inner periphery sides and integrally joined to each other. This avoids the fall-off of the solid lubricating compositions 5 from the retainer 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、軸受空間に超高分子量樹脂粉末と潤滑グリースとの混合物を焼成した固体潤滑組成物を充填したころ軸受に関する。 The present invention relates to a roller bearing in which a bearing space is filled with a solid lubricating composition obtained by firing a mixture of ultrahigh molecular weight resin powder and lubricating grease.

転動体としての複数のころを、円周方向に複数の柱部で区画された保持器のポケットに保持したころ軸受には、保持器の両面側の軸受空間に超高分子量樹脂粉末と潤滑グリースとの混合物を焼成した固体潤滑組成物を充填し、軸受空間のシール部材を装着しなくても、潤滑剤の外部への漏れや、外部からの異物の侵入を防止できるようにしたものがある（例えば、特許文献１参照）。 For roller bearings in which a plurality of rollers as rolling elements are held in a pocket of a cage partitioned by a plurality of pillars in the circumferential direction, ultra high molecular weight resin powder and lubricating grease are placed in the bearing space on both sides of the cage. Filled with a solid lubricant composition fired from a mixture of the above and the like, it is possible to prevent leakage of the lubricant to the outside and intrusion of foreign matter from the outside without mounting a seal member in the bearing space (For example, refer to Patent Document 1).

特許文献１に記載されたものは、保持器を円筒状とし、その円周方向に複数の柱部で区画したポケットにころを保持したラジアル型ころ軸受であり、前記固体潤滑組成物は、保持器の外周と内周の両面側の軸受空間に、フルに充填されている。保持器の両面側の軸受空間に部分的に充填したものもある。なお、保持器を円板状とし、その円周方向に複数の柱部で放射状に区画されたポケットにころを保持したスラスト型ころ軸受では、固体潤滑組成物は、円板状の保持器の両面側の軸受空間に、フルまたは部分的に充填される。 What is described in Patent Document 1 is a radial roller bearing in which a cage is cylindrical, and rollers are held in pockets partitioned by a plurality of pillars in the circumferential direction thereof. The bearing space on both sides of the outer periphery and inner periphery of the container is fully filled. There is also one in which the bearing space on both sides of the cage is partially filled. Incidentally, in the thrust type roller bearing in which the cage is disc-shaped and the rollers are held in pockets radially divided by a plurality of pillars in the circumferential direction, the solid lubricating composition is the same as that of the disc-shaped cage. The bearing space on both sides is fully or partially filled.

特開２０００−１０４７４６号公報JP 2000-104746 A

特許文献１に記載されたように、保持器の両面側の軸受空間に固体潤滑組成物を充填したころ軸受は、固体潤滑組成物が強固に保持器に結合されず、保持器から脱落しやすい問題がある。このため、脱落した固体潤滑組成物が異物となり、急激なトルク上昇や温度上昇を引き起こす恐れがある。また、軸や軸孔の表面をころが転動する軌道面とし、内輪および外輪の軌道輪を有さないころ軸受では、搬送時や組み込み時に固体潤滑組成物が保持器から脱落する恐れもある。 As described in Patent Document 1, in the roller bearing in which the bearing space on both sides of the cage is filled with the solid lubricating composition, the solid lubricating composition is not firmly coupled to the cage and is easily dropped from the cage. There's a problem. For this reason, the dropped solid lubricating composition becomes a foreign substance, which may cause a sudden increase in torque and temperature. In addition, in the case of a roller bearing that uses the surface of the shaft or shaft hole as a raceway surface on which the roller rolls and does not have inner and outer raceways, the solid lubricating composition may fall out of the cage during transportation or installation. .

そこで、本発明の課題は、保持器の両面側で軸受空間に充填される固体潤滑組成物が保持器から脱落しないようにすることである。 Therefore, an object of the present invention is to prevent the solid lubricating composition filled in the bearing space on both sides of the cage from dropping from the cage.

上記の課題を解決するために、本発明は、転動体としての複数のころを、円周方向に複数の柱部で区画された保持器のポケットに保持し、前記保持器の両面側に形成される軸受空間に、超高分子量樹脂粉末と潤滑グリースとの混合物を焼成した固体潤滑組成物を充填したころ軸受において、前記保持器の柱部の両面に貫通する貫通部を設け、この柱部の貫通部に充填される前記固体潤滑組成物で、前記保持器の両面側に充填された固体潤滑組成物を一体に結合した構成を採用した。 In order to solve the above problems, the present invention holds a plurality of rollers as rolling elements in a pocket of a cage partitioned by a plurality of pillars in the circumferential direction, and is formed on both sides of the cage. In a roller bearing filled with a solid lubricating composition obtained by firing a mixture of ultra-high molecular weight resin powder and lubricating grease in the bearing space to be provided, through portions penetrating both sides of the column portion of the cage are provided. A configuration was adopted in which the solid lubricating composition filled in the penetrating portion of the cage and the solid lubricating composition filled on both sides of the cage were combined together.

すなわち、保持器の柱部の両面に貫通する貫通部を設け、この柱部の貫通部に充填される固体潤滑組成物で、保持器の両面側に充填された固体潤滑組成物を一体に結合することにより、固体潤滑組成物が保持器から脱落しないようにした。なお、柱部の貫通部は、孔や端面の切欠きとすることができる。 In other words, penetrating parts that penetrate both sides of the pillar part of the cage are provided, and the solid lubricating composition filled on both sides of the cage is integrally bonded with the solid lubricating composition filled in the penetrating part of the pillar part. By doing so, the solid lubricating composition was prevented from falling off from the cage. In addition, the penetration part of a pillar part can be made into the notch of a hole or an end surface.

前記貫通部を少なくとも１つの前記柱部の複数箇所に設けることにより、保持器の両面側の固体潤滑組成物をより強固に結合することができる。 By providing the penetrating portion at a plurality of locations of at least one of the pillar portions, the solid lubricating composition on both sides of the cage can be more firmly bonded.

前記貫通部を全ての前記柱部に設けることにより、保持器の両面側の固体潤滑組成物を保持器の円周方向で満遍なく結合することができる。 By providing the penetrating portion in all the column portions, the solid lubricating composition on both sides of the cage can be uniformly bonded in the circumferential direction of the cage.

前記保持器を樹脂製のものとすることにより、射出成形等により貫通部を容易に形成することができる。 By using the cage made of resin, the penetrating portion can be easily formed by injection molding or the like.

前記ころ軸受は、前記保持器を円筒状または円錐筒状とし、その円周方向に複数の柱部で区画したポケットに前記ころを保持したラジアル型ころ軸受とすることができる。 The roller bearing may be a radial roller bearing in which the cage is cylindrical or conical, and the rollers are held in pockets partitioned by a plurality of pillars in the circumferential direction.

前記ころ軸受は、前記保持器を円板状とし、その円周方向に複数の柱部で放射状に区画されたポケットに前記ころを保持したスラスト型ころ軸受とすることができる。 The roller bearing may be a thrust roller bearing in which the cage is formed in a disc shape, and the rollers are held in pockets radially defined by a plurality of pillars in the circumferential direction.

上述した各ころ軸受は、前記ころが転動する軌道輪を有さないものに好適である。 Each of the roller bearings described above is suitable for a roller bearing that does not have a race ring on which the roller rolls.

本発明のころ軸受は、保持器の柱部の両面に貫通する貫通部を設け、この貫通部に充填される固体潤滑組成物で、保持器の両面側に充填された固体潤滑組成物を一体に結合したので、固体潤滑組成物が保持器から脱落しないようにすることができる。 The roller bearing of the present invention is provided with penetrating parts penetrating both sides of the pillar part of the cage, and the solid lubricating composition filled on both sides of the cage is integrated with the solid lubricating composition filled in the penetrating part. The solid lubricant composition can be prevented from falling off from the cage.

以下、図面に基づき、本発明の実施形態を説明する。図１および図２は、第１の実施形態を示す。このころ軸受は、図１（ａ）、（ｂ）に示すように、円筒状の保持器２の円周方向に複数の柱部２ａで区画したポケット３に複数の針状ころ４を保持した軌道輪を有さないラジアル型針状ころ軸受１であり、保持器２の外周側に配置されるハウジングの軸孔Ａと、保持器２の内周側に配置される回転軸Ｂとの間に形成される軸受空間に、超高分子量樹脂粉末としての超高分子量ポリオレフィン粉末と潤滑グリースとの混合物を焼成した固体潤滑組成物５がフルに充填されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment. As shown in FIGS. 1 (a) and 1 (b), this roller bearing holds a plurality of needle rollers 4 in a pocket 3 partitioned by a plurality of column portions 2a in the circumferential direction of a cylindrical cage 2. A radial needle roller bearing 1 having no bearing ring, between a shaft hole A of a housing arranged on the outer peripheral side of the cage 2 and a rotary shaft B arranged on the inner peripheral side of the cage 2 The solid lubricant composition 5 obtained by firing a mixture of an ultrahigh molecular weight polyolefin powder as an ultrahigh molecular weight resin powder and a lubricating grease is fully filled in the bearing space formed in FIG.

前記保持器２は射出成形で形成された樹脂製のものとされ、図２に示すように、各柱部２ａには貫通部としての孔６が１つずつ設けられており、図１に示したように、保持器２の外周と内周の両面側に充填された固体潤滑組成物５が、各孔６に充填された固体潤滑組成物５で一体に結合されている。したがって、保持器２からの固体潤滑組成物５の脱落が防止される。 The cage 2 is made of resin formed by injection molding, and as shown in FIG. 2, each pillar portion 2a is provided with one hole 6 as a through portion, as shown in FIG. As described above, the solid lubricating composition 5 filled on both sides of the outer circumference and the inner circumference of the cage 2 is integrally coupled with the solid lubricating composition 5 filled in each hole 6. Therefore, the solid lubricating composition 5 is prevented from dropping from the cage 2.

図３（ａ）、（ｂ）、（ｃ）は、それぞれ前記保持器２の変形例を示す。（ａ）の変形例は、各柱部２ａに貫通部として小さい孔６を３つずつ設けたもの、（ｂ）の変形例は、各柱部２ａの片側に貫通部として円弧状の切欠き７を１つずつ設けたもの、（ｃ）の変形例は、各柱部２ａの両側に円弧状の切欠き７を２つずつ、合計４つずつ設けたものである。 3 (a), 3 (b), and 3 (c) show modified examples of the cage 2 respectively. In the modified example of (a), three small holes 6 are provided as penetrating parts in each column part 2a, and in the modified example of (b), an arc-shaped notch is formed as a penetrating part on one side of each column part 2a. In the modified example (c), four arcuate cutouts 7 are provided on both sides of each column part 2a, for a total of four.

図４および図５は、第２の実施形態を示す。このころ軸受は、図４に示すように、円板状の保持器１２の円周方向に複数の柱部１２ａで放射状に区画したポケット１３に複数の針状ころ１４を保持した軌道輪を有さないスラスト型針状ころ軸受１１であり、保持器１２の両面側に形成される軸受空間に、前記固体潤滑組成物５がフルに充填されている。 4 and 5 show a second embodiment. As shown in FIG. 4, this roller bearing has a bearing ring that holds a plurality of needle rollers 14 in pockets 13 that are radially partitioned by a plurality of column portions 12 a in the circumferential direction of a disk-shaped cage 12. This is a thrust type needle roller bearing 11 that does not, and the solid lubricating composition 5 is fully filled in bearing spaces formed on both sides of the cage 12.

前記保持器１２は鋼板で形成され、図５に示すように、各柱部１２ａには貫通部としての大小の孔６が１つずつ、合計２つずつ設けられ、図４に示したように、保持器１２の両面側に充填された固体潤滑組成物５が、各孔６に充填された固体潤滑組成物５で一体に結合されている。したがって、この実施形態でも、保持器１２からの固体潤滑組成物５の脱落が防止される。 The cage 12 is formed of a steel plate, and as shown in FIG. 5, each pillar portion 12 a is provided with one large and small hole 6 as a penetrating portion, two in total, as shown in FIG. 4. The solid lubricating composition 5 filled on both sides of the cage 12 is integrally bonded with the solid lubricating composition 5 filled in each hole 6. Therefore, also in this embodiment, the solid lubricating composition 5 is prevented from falling off from the cage 12.

上述した各実施形態では、ころ軸受を軌道輪のないラジアル型とスラスト型の針状ころ軸受としたが、本発明に係るころ軸受は、円筒ころ軸受や円錐ころ軸受とすることもでき、内輪と外輪の両方の軌道輪を有するものや、内輪と外輪の一方の軌道輪を有するものにも適用することができる。 In each of the embodiments described above, the roller bearings are radial and thrust needle roller bearings without a bearing ring. However, the roller bearing according to the present invention may be a cylindrical roller bearing or a tapered roller bearing, The present invention can also be applied to those having both the outer ring and the outer ring, and those having one of the inner ring and the outer ring.

また、上述した各実施形態では、固体潤滑組成物を保持器の両面側の軸受空間にフルに充填したものとしたが、両面側の軸受空間に部分的に充填したものとすることもできる。 Further, in each of the above-described embodiments, the solid lubricating composition is fully filled in the bearing space on both sides of the cage. However, the bearing space on both sides may be partially filled.

さらに、上述した各実施形態では、保持器の全ての柱部に孔や切欠きの貫通部を設け、孔を丸孔、切欠きを円弧状のものとしたが、貫通部は一部の柱部に間引きして設けることもでき、貫通部の孔や切欠きの形状と個数は、柱部が強度不足とならない範囲で任意に設計することができる。 Further, in each of the above-described embodiments, holes and notch through portions are provided in all the column portions of the cage, and the holes are round holes and the notches are arc-shaped. The shape and number of through holes and notches can be arbitrarily designed as long as the pillars do not have insufficient strength.

ａは第１の実施形態のころ軸受を示す縦断面図、ｂはａのＩ−Ｉ線に沿った断面図a is a longitudinal sectional view showing the roller bearing of the first embodiment, and b is a sectional view taken along line II of a. 図１の保持器の展開平面図1 is a developed plan view of the cage of FIG. ａ、ｂ、ｃは、それぞれ図２の保持器の変形例を示す展開平面図a, b, and c are developed plan views showing modified examples of the cage shown in FIG. 第２の実施形態のころ軸受を示す縦断面図A longitudinal sectional view showing a roller bearing of a second embodiment 図４の保持器を示す平面図The top view which shows the holder | retainer of FIG.

符号の説明Explanation of symbols

１、１１針状ころ軸受
２、１２保持器
２ａ、１２ａ柱部
３、１３ポケット
４、１４針状ころ
５固体潤滑組成物
６孔
７切欠き DESCRIPTION OF SYMBOLS 1, 11 Needle roller bearings 2, 12 Cage 2a, 12a Pillar part 3, 13 Pocket 4, 14 Needle roller 5 Solid lubricating composition 6 Hole 7 Notch

Claims

転動体としての複数のころを、円周方向に複数の柱部で区画された保持器のポケットに保持し、前記保持器の両面側に形成される軸受空間に、超高分子量樹脂粉末と潤滑グリースとの混合物を焼成した固体潤滑組成物を充填したころ軸受において、前記保持器の柱部の両面に貫通する貫通部を設け、この柱部の貫通部に充填される前記固体潤滑組成物で、前記保持器の両面側に充填された固体潤滑組成物を一体に結合したことを特徴とするころ軸受。 A plurality of rollers as rolling elements are held in a pocket of a cage partitioned by a plurality of pillars in the circumferential direction, and ultra high molecular weight resin powder and lubrication are provided in bearing spaces formed on both sides of the cage. In a roller bearing filled with a solid lubricating composition obtained by firing a mixture with grease, the solid lubricating composition is provided with penetrating portions penetrating both sides of the pillar portion of the cage, and filled in the penetrating portion of the pillar portion. A roller bearing in which solid lubricant compositions filled on both sides of the cage are integrally bonded.

前記貫通部を少なくとも１つの前記柱部の複数箇所に設けた請求項１に記載のころ軸受。 The roller bearing according to claim 1, wherein the penetrating portion is provided at a plurality of locations of at least one of the pillar portions.

前記貫通部を全ての前記柱部に設けた請求項１または２に記載のころ軸受。 The roller bearing according to claim 1, wherein the penetrating portion is provided in all the column portions.

前記保持器を樹脂製のものとした請求項１乃至３のいずれかに記載のころ軸受。 The roller bearing according to claim 1, wherein the cage is made of resin.

前記ころ軸受が、前記保持器を円筒状または円錐筒状とし、その円周方向に複数の柱部で区画したポケットに前記ころを保持したラジアル型ころ軸受である請求項１乃至４のいずれかに記載のころ軸受。 5. The radial roller bearing according to claim 1, wherein the roller bearing is a radial roller bearing in which the cage is cylindrical or conical, and the roller is held in a pocket partitioned by a plurality of pillars in the circumferential direction. The roller bearing described in 1.

前記ころ軸受が、前記保持器を円板状とし、その円周方向に複数の柱部で放射状に区画されたポケットに前記ころを保持したスラスト型ころ軸受である請求項１乃至４のいずれかに記載のころ軸受。 5. The thrust roller bearing according to claim 1, wherein the roller bearing is a thrust type roller bearing in which the cage is formed in a disc shape, and the rollers are held in pockets radially divided by a plurality of column portions in a circumferential direction thereof. The roller bearing described in 1.

前記ころ軸受が、前記ころが転動する軌道輪を有さないものである請求項１乃至６のいずれかに記載のころ軸受。 The roller bearing according to any one of claims 1 to 6, wherein the roller bearing does not have a race ring on which the roller rolls.