JP2007270949A - Thrust roller bearing - Google Patents

Thrust roller bearing Download PDF

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Publication number
JP2007270949A
JP2007270949A JP2006096961A JP2006096961A JP2007270949A JP 2007270949 A JP2007270949 A JP 2007270949A JP 2006096961 A JP2006096961 A JP 2006096961A JP 2006096961 A JP2006096961 A JP 2006096961A JP 2007270949 A JP2007270949 A JP 2007270949A
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Japan
Prior art keywords
diameter side
roller
outer diameter
roller bearing
pocket
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Pending
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JP2006096961A
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Japanese (ja)
Inventor
Yoshitaka Waseda
義孝 早稲田
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JTEKT Corp
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JTEKT Corp
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Priority to JP2006096961A priority Critical patent/JP2007270949A/en
Publication of JP2007270949A publication Critical patent/JP2007270949A/en
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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
    • 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
    • F16C33/46—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
    • 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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6696—Special parts or details in view of lubrication with solids as lubricant, e.g. dry coatings, powder

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust roller bearing which can reduce the heat generation and the seizure at the contact portion of a roller with an outside-diameter side flange by bringing the central portion of the end portion of the roller into contact with the inside wall surface of the outside diameter side flange. <P>SOLUTION: The thrust roller bearing comprises rollers 1 having nearly hemispherical portions at both their ends, and a retainer 10 which has the outside-diameter side flange 12 provided on the outside-diameter side of a flat annular portion 11, an inside diameter side flange 13 provided on the inside-diameter side of the flat annular portion 11, and has pockets 14 formed circumferentially at required intervals along the annular portion 11, wherein at least the outside-diameter side edge portion 15 of the pockets 14 of the retainer 10 is formed arcuately. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、スラストころ軸受に係り、より詳しくは、ころの端面と保持器との接触部の発熱や焼付きを防止することのできるスラストころ軸受に関するものである。   The present invention relates to a thrust roller bearing, and more particularly, to a thrust roller bearing capable of preventing heat generation and seizure at a contact portion between a roller end face and a cage.

従来のスラスト針状ころ軸受に、保持器のポケット内の側面に保持器半径方向に並んでころ案内部を複数設け、これらのころ案内部を、運転時にその端面がポケット外径端に接触する位置にあるころの中央位置に対して対称となる位置に配置したものがある（例えば、特許文献１参照）。   A conventional thrust needle roller bearing is provided with a plurality of roller guides arranged in the radial direction of the cage on the side surface in the pocket of the cage, and these roller guides are in contact with the outer diameter end of the pocket during operation. There is one arranged at a position that is symmetrical with respect to the center position of the roller at the position (see, for example, Patent Document 1).

特開２０００−１９２９６５号公報（第３−４頁、図１）JP 2000-192965 A (page 3-4, FIG. 1)

地球温暖化防止対策として、例えば、空気調和装置のコンプレッサ用の冷媒を、従来の代替フロンからＣＯ2への変更が検討されている。しかし、ＣＯ2冷媒は、その性質上高圧領域で使用されるため、コンプレッサに使用されるスラストころ軸受の潤滑雰囲気は高温下にあることになる。
また、スラストころ軸受は、運転による軸受自身の回転により、各摺動部が発熱するため、これらと相俟って冷却不足による各摺動部に発熱や焼付きが生じ易く、特に、ころの端面と保持器との接触部における損傷が大きい。 As measures for preventing global warming, for example, changing the refrigerant for the compressor of the air conditioner to CO 2 from the conventional alternative chlorofluorocarbon has been studied. However, since the CO 2 refrigerant is used in the high pressure region due to its nature, the lubricating atmosphere of the thrust roller bearing used in the compressor is at a high temperature.
Also, in the thrust roller bearing, each sliding part generates heat due to the rotation of the bearing itself during operation, and in combination with these, each sliding part easily generates heat and seizes due to insufficient cooling. The damage at the contact portion between the end face and the cage is large.

スラストころ軸受のころは、運転時に遠心力により保持器のポケット内において外径側に振り飛ばされ、ポケットの外径側縁部に衝突し接触を続ける。
特許文献１のスラスト針状ころ軸受は、運転中、円弧状に形成されたころの外径側端面が保持器のポケットの外径側縁部に接触するが、この接触位置は、ころの軸方向の中心より下方であるため、ころの回転により端面の全周にわたって接触し、かつ接触部の周速が大きいため、この部分が発熱し、焼付きが生じ易いという問題がある。 The roller of the thrust roller bearing is swung away to the outer diameter side in the pocket of the cage by centrifugal force during operation, and collides with the outer diameter side edge of the pocket and keeps contacting.
In the thrust needle roller bearing of Patent Document 1, the outer diameter side end surface of the roller formed in an arc shape contacts with the outer diameter side edge of the cage pocket during operation. Since it is below the center of the direction, the roller rotates to contact the entire circumference of the end surface, and since the peripheral speed of the contact portion is large, there is a problem that this portion generates heat and seizure is likely to occur.

この点について、図３，図４を用いてさらに詳説すると、ころ１は、その下部、すなわち、軸方向の中心０−０より下方が保持器１０ａの長方形のポケット１４ａに収容されて保持されているため、運転中にころ１が外径側方向に移動すると、端部の軸方向の中心０−０より下部がポケット１０ａの外径側縁部１５ａに接触するため、上述のように発熱して焼付きが生じ易いことになる。   This point will be described in more detail with reference to FIGS. 3 and 4. The roller 1 is housed and held in the rectangular pocket 14a of the retainer 10a at the lower part, that is, below the axial center 0-0. Therefore, when the roller 1 moves in the outer diameter direction during operation, the lower part from the axial center 0-0 of the end part comes into contact with the outer edge 15a of the pocket 10a, so that heat is generated as described above. Seizure is likely to occur.

本発明は、上記の課題を解決するためになされたもので、ころの端部の中心部を外径側フランジの内壁面と接触させることにより、両者の接触部の発熱や焼付きの発生を低減させるようにしたスラストころ軸受を提供することを目的としたものである。   The present invention has been made to solve the above-described problems. By bringing the center of the end of the roller into contact with the inner wall surface of the outer diameter side flange, heat generation and seizure of both contact portions are generated. It is an object of the present invention to provide a thrust roller bearing that can be reduced.

本発明に係るスラストころ軸受は、両端部がほぼ半球状に形成されたころと、平板状の環状部の外径側に外径側フランジが設けられ内径側に内径側フランジが設けられて、前記環状部の周方向に所定の間隔でポケットが形成された保持器とを有し、該保持器のポケットの少なくとも外径側の縁部を円弧状に形成したものである。   In the thrust roller bearing according to the present invention, both end portions are substantially hemispherical, an outer diameter side flange is provided on the outer diameter side of the plate-like annular portion, and an inner diameter side flange is provided on the inner diameter side. And a retainer having pockets formed at predetermined intervals in the circumferential direction of the annular portion, and at least an edge on the outer diameter side of the pocket of the retainer is formed in an arc shape.

また、上記の保持器のポケットの外径側の縁部を、前記ころの両端部の曲率半径より大きい曲率半径により円弧状に形成したものである。   Moreover, the edge part of the outer diameter side of the pocket of the cage is formed in an arc shape with a radius of curvature larger than the radius of curvature of both ends of the roller.

本発明によれば、運転時に外径側に移動したころの端部の中心部が外径側フランジの内壁面と接触し、ポケットの外径側縁部には接触しないようにしたので、外径側フランジの内壁面ところの端面との接触部における発熱や焼付きを大幅に低減することができ、軸受の回転精度が向上すると共に、その寿命を延ばすことができる。   According to the present invention, the center part of the end of the roller that has moved to the outer diameter side during operation is in contact with the inner wall surface of the outer diameter side flange and is not in contact with the outer diameter side edge of the pocket. Heat generation and seizure at the contact portion with the end surface of the inner wall surface of the radial flange can be greatly reduced, and the rotation accuracy of the bearing can be improved and the life thereof can be extended.

図１は本発明の一実施の形態に係るスラストころ軸受の要部の縦断面図、図２は図１の保持器の平面図である。なお、以下の説明では、図の左側を外径側、右側を内径側という。
図において、１は両端部２ａ，２ｂが曲率半径ｒで半球状に形成されたころである。 FIG. 1 is a longitudinal sectional view of an essential part of a thrust roller bearing according to an embodiment of the present invention, and FIG. 2 is a plan view of the cage of FIG. In the following description, the left side of the figure is referred to as the outer diameter side, and the right side is referred to as the inner diameter side.
In the figure, reference numeral 1 denotes a roller in which both end portions 2a and 2b are formed in a hemispherical shape with a radius of curvature r.

１０はころ１を保持するほぼ円板状の保持器で、平板状の環状部１１の外径側にはほぼ逆Ｕ字状に折曲げられた外径側フランジ１２が設けられており、内径側にはほぼ逆凹字状に折曲げられた内径側フランジ１３が設けられている。なお、外径側フランジ１２及び内径側フランジ１３は上記の形状に限定するものではなく、適宜変更することができる。そして、環状部１１には円周方向に所定の間隔で、ころ１の軸方向の下部が挿入されるほぼ長方形状のポケット１４が設けられており、このポケット１４の外径側縁部１５は、ころ１の両端部の曲率半径ｒより大きい曲率半径ｒにより円弧状に形成されている。なお、ポケット１４の内径側縁部１６も同様に円弧状に形成してもよい。   Reference numeral 10 denotes a substantially disc-shaped cage for holding the roller 1, and an outer diameter side flange 12 bent in a substantially inverted U shape is provided on the outer diameter side of the flat plate-like annular portion 11. On the side, an inner diameter side flange 13 bent in a substantially inverted concave shape is provided. In addition, the outer diameter side flange 12 and the inner diameter side flange 13 are not limited to the above shapes, and can be changed as appropriate. The annular portion 11 is provided with a substantially rectangular pocket 14 into which the lower portion in the axial direction of the roller 1 is inserted at a predetermined interval in the circumferential direction. The roller 1 is formed in an arc shape with a radius of curvature r larger than the radius of curvature r at both ends of the roller 1. Similarly, the inner edge 16 of the pocket 14 may be formed in an arc shape.

上記のように構成した本発明に係るスラストころ軸受においては、ころ１はその軸方向の中心０−０より下部が保持器１０のポケット１４に収容されて保持される。
運転による遠心力によりころ１がポケット１４内を外径側に移動すると、ころ１のほぼ半球状の端面２ａの中心部が外径側フランジ１２の内壁面に当り、その下部はポケット１４の外径側縁部１５に接触しない。 In the thrust roller bearing according to the present invention configured as described above, the roller 1 is accommodated and held in the pocket 14 of the cage 10 below the axial center 0-0.
When the roller 1 moves to the outer diameter side in the pocket 14 due to the centrifugal force due to operation, the center portion of the substantially hemispherical end surface 2a of the roller 1 hits the inner wall surface of the outer diameter side flange 12, and the lower part is outside the pocket 14 It does not contact the radial edge 15.

この場合、必要に応じて、保持器の表面に耐摩耗性、非焼付性、初期なじみ性を向上させるための固体潤滑剤皮膜をコーティングしておくことが好ましい。この固体潤滑剤としては、例えば、ポリイミド、エポキシ樹脂等の熱硬化性樹脂や、ポリテトラフルオロエチレンなどの高分子樹脂、あるいはこれらの樹脂以外に、銅、銀、錫、亜鉛等、及びこれらの合金、黒鉛、酸化鉛、二硫化タングスラン、二硫化モリブデン等の軟質金属等がある。そして、これら被膜のコーティング方法としては、スパッタリング法、蒸着法、またはイオンプレーティング法等がある。   In this case, it is preferable to coat the surface of the cage with a solid lubricant film for improving the wear resistance, non-seizure property, and initial conformability as necessary. Examples of the solid lubricant include thermosetting resins such as polyimide and epoxy resins, polymer resins such as polytetrafluoroethylene, and other than these resins, copper, silver, tin, zinc, and the like. There are soft metals such as alloys, graphite, lead oxide, tungsten disulfide and molybdenum disulfide. Examples of coating methods for these films include sputtering, vapor deposition, and ion plating.

本発明は、上記のように、ころ１の下部が収容される保持器１０のポケット１４の外径側縁部１５を、ころ１のほぼ半球状の両端部の曲率半径ｒより大きい曲率半径ｒ1で円弧状に形成したので、運転による遠心力によりころ１が外径側に移動すると、その端面の中心部が外側フランジ１２の内壁面に当り、ポケット１４の外径側縁部１５には接触しないようにした。これにより、ころ１の端面が外径側フランジ１２の内壁面にほぼ点接触し、軸受の回転による外径側フランジ１２の内壁面ところ１の端面との接触部の周速が大幅に低下し、かつ１か所で接触するため、発熱や焼付きの発生を大幅に低減することができ、回転精度が向上すると共に、軸受の寿命を延すことができる。 In the present invention, as described above, the outer radius side edge 15 of the pocket 14 of the retainer 10 in which the lower part of the roller 1 is accommodated has a radius of curvature r larger than the radius of curvature r of both substantially hemispherical ends of the roller 1. 1 so that when the roller 1 is moved to the outer diameter side by centrifugal force due to operation, the center portion of the end face hits the inner wall surface of the outer flange 12, and the outer diameter side edge 15 of the pocket 14 I tried not to touch it. As a result, the end surface of the roller 1 is substantially point-contacted with the inner wall surface of the outer diameter side flange 12, and the peripheral speed of the contact portion between the inner wall surface of the outer diameter side flange 12 and the end surface of the outer surface due to the rotation of the bearing is greatly reduced. In addition, since the contact is made at one place, the generation of heat generation and seizure can be greatly reduced, the rotational accuracy can be improved, and the life of the bearing can be extended.

本発明の一実施の形態に係るスラストころ軸受の要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the thrust roller bearing which concerns on one embodiment of this invention. 図１の保持器の平面図である。It is a top view of the holder | retainer of FIG. 従来のスラストころ軸受の一例の要部の断面図である。It is sectional drawing of the principal part of an example of the conventional thrust roller bearing. 図３の保持器の平面図である。It is a top view of the holder | retainer of FIG.

符号の説明Explanation of symbols

１ ころ、１０ 保持器、１１ 環状部、１２ 外径側フランジ、１３ 内径側フランジ、１４ ポケット、１５ ポケットの外径側縁部。
DESCRIPTION OF SYMBOLS 1 Roller, 10 Cage, 11 Annular part, 12 Outer diameter side flange, 13 Inner diameter side flange, 14 Pocket, 15 Outer diameter side edge of pocket.

Claims (2)

両端部がほぼ半球状に形成されたころと、平板状の環状部の外径側に外径側フランジが設けられ内径側に内径側フランジが設けられて、前記環状部の周方向に所定の間隔でポケットが形成された保持器とを有し、
該保持器のポケットの少なくとも外径側の縁部を円弧状に形成したことを特徴とするスラストころ軸受。 A roller having both end portions substantially hemispherical, an outer flange on the outer diameter side of the flat annular portion, an inner flange on the inner diameter side, and a predetermined direction in the circumferential direction of the annular portion. A cage with pockets formed at intervals,
A thrust roller bearing characterized in that at least the outer diameter side edge of the pocket of the cage is formed in an arc shape. 前記保持器のポケットの外径側の縁部を、前記ころの両端部の曲率半径より大きい曲率半径により円弧状に形成したことを特徴とする請求項１記載のスラストころ軸受。
2. The thrust roller bearing according to claim 1, wherein an edge portion on an outer diameter side of the pocket of the cage is formed in an arc shape with a radius of curvature larger than a radius of curvature of both end portions of the roller.
JP2006096961A 2006-03-31 2006-03-31 Thrust roller bearing Pending JP2007270949A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012097872A (en) * 2010-11-05 2012-05-24 Nsk Ltd Retainer for bearing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003083333A (en) * 2001-09-06 2003-03-19 Koyo Seiko Co Ltd Needle roller thrust bearing
JP2003294038A (en) * 2002-04-01 2003-10-15 Nsk Ltd Conical roller bearing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003083333A (en) * 2001-09-06 2003-03-19 Koyo Seiko Co Ltd Needle roller thrust bearing
JP2003294038A (en) * 2002-04-01 2003-10-15 Nsk Ltd Conical roller bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012097872A (en) * 2010-11-05 2012-05-24 Nsk Ltd Retainer for bearing

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