JP2005344877A

JP2005344877A - Thrust roller bearing

Info

Publication number: JP2005344877A
Application number: JP2004167129A
Authority: JP
Inventors: Yoshitaka Waseda; 義孝早稲田
Original assignee: Koyo Seiko Co Ltd
Current assignee: Koyo Seiko Co Ltd
Priority date: 2004-06-04
Filing date: 2004-06-04
Publication date: 2005-12-15

Abstract

<P>PROBLEM TO BE SOLVED: To improve seizure resistance of races 10 and 11 in a thrust roller bearing 7. <P>SOLUTION: A frictional force reducing layer 18 is arranged on inner diameter surfaces 10b and 11b of the races 10 and 11 opposed in the radial direction to an outer peripheral surface of a rotary shaft (a shaft part) 19 via predetermined clearance. Outside surfaces 10d and 11d received by a flange (an annular member) 19a of the rotary shaft 19 in these races 10 and 11, are formed into a texture surface uncovered with the frictional force reducing layer 18. Thus, the races 10 and 11 are hardly dislocated and moved in the radial direction to the flange 19a and the annular member 20, and the races 10 and 11 hardly slidingly contact with the outer peripheral surface of the rotary shaft 19. Since frictional resistance is reduced even when slidingly contacts, heating is restrained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、スラストころ軸受に関する。 The present invention relates to a thrust roller bearing.

スラストころ軸受は、二つのレースの間に保持器で保持した複数個のころを配置した構成であり、例えば潤滑条件の厳しい環境で用いる場合には、軸受外部より供給された潤滑剤を軸受内部に保持しやすくすることが考えられている（例えば特許文献１参照。）。このスラストころ軸受において、例えばレースが使用場所において径方向に位置決めされていない場合、レースが径方向にずれ動いて回転軸の外周面、あるいは外筒部材の内周面に滑り接触すると、潤滑剤の量が少ない場合には早期段階で発熱して焼付きし、さらには軸受がロックしてしまうことがある。 A thrust roller bearing has a configuration in which a plurality of rollers held by a cage are arranged between two races. For example, when used in an environment with severe lubrication conditions, a lubricant supplied from the outside of the bearing is used as the inside of the bearing. It has been considered to make it easier to hold (see, for example, Patent Document 1). In this thrust roller bearing, for example, when the race is not positioned in the radial direction at the place of use, if the race moves in the radial direction and slides into contact with the outer peripheral surface of the rotating shaft or the inner peripheral surface of the outer cylindrical member, the lubricant If the amount is too small, heat may be generated and seized at an early stage, and the bearing may be locked.

また、スラストころ軸受において、レースの全表面に摩擦力軽減層を設けたものがある（例えば特許文献２参照。）。この場合、レースの外側面とそれを受ける環状部材との間で相対滑りが生じやすくなるので、当該レースが径方向にずれ動きやすくなって、レースが軸部の外周面、あるいは外筒の内周面に滑り接触する現象が多発する。また、軌道面においては、ころのすべりが発生することにより、ころの外周面に帯状の摩耗が発生し、ころが多角形状になる現象が発生することもある。このため、この滑り接触部位における摩擦抵抗は摩擦力軽減層にて軽減されるものの、上記滑り接触現象が多発するために経時的にトルクが増加したり耐焼付き性が低下したりするおそれがある。
特開２００３−１０６３３１号特開２００２−２１３４３９号 In addition, there is a thrust roller bearing in which a friction force reducing layer is provided on the entire surface of a race (see, for example, Patent Document 2). In this case, relative slip is likely to occur between the outer side surface of the race and the annular member that receives the race, so that the race is likely to be displaced in the radial direction, and the race is moved to the outer peripheral surface of the shaft portion or the inner cylinder. The phenomenon of sliding contact with the peripheral surface frequently occurs. Further, on the raceway surface, due to the occurrence of roller slip, belt-like wear may occur on the outer peripheral surface of the roller, and the roller may become polygonal. For this reason, although the frictional resistance at the sliding contact portion is reduced by the frictional force reducing layer, the sliding contact phenomenon occurs frequently, so that the torque may increase with time or the seizure resistance may decrease. .
JP 2003-106331 A JP 2002-213439 A

本発明は、スラストころ軸受において、レースが回転部材に滑り接触したときの摩擦抵抗を軽減し、耐焼付き性を向上することを課題としている。 An object of the present invention is to reduce frictional resistance and improve seizure resistance when a race is in sliding contact with a rotating member in a thrust roller bearing.

本発明は、複数個のころと、各ころを円周方向略等間隔に配置する保持器と、各ころの軌道面を有する少なくとも一つの金属製環状板からなるレースとを備え、かつ軸方向で対向する環状部材間に配置されるスラストころ軸受であって、上記レースの内径面および外径面のうち、該一方の環状部材に一体に設けられる軸部外周面または外筒内周面に径方向に所定のすきまを介して対向する側に、摩擦力軽減層を設け、かつ、このレースにおいて上記一方の環状部材で受けられる外側面を上記摩擦力軽減層で被覆していない地肌面としたことを特徴としている。 The present invention includes a plurality of rollers, a cage in which the rollers are arranged at substantially equal intervals in the circumferential direction, and a race made of at least one metal annular plate having a raceway surface of each roller, and the axial direction. A thrust roller bearing disposed between the annular members facing each other on the outer peripheral surface of the shaft portion or the inner peripheral surface of the outer cylinder provided integrally with the one annular member, of the inner diameter surface and the outer diameter surface of the race. A ground surface that is provided with a frictional force reducing layer on the side facing through a predetermined gap in the radial direction, and the outer surface received by the one annular member in this race is not covered with the frictional force reducing layer; It is characterized by that.

ここで、レースの案内面とはレースの内径面または外径面であり、相手部材に摺動する面を言う。回転部材とは、スラストころ軸受が配置される場所において、レースの内径側に配置される回転軸や、レースの外径側に配置される外筒部材等がある。 Here, the race guide surface is an inner diameter surface or an outer diameter surface of the race and refers to a surface that slides on the mating member. Examples of the rotating member include a rotating shaft disposed on the inner diameter side of the race, an outer cylinder member disposed on the outer diameter side of the race, and the like at a place where the thrust roller bearing is disposed.

本発明によると、レースの外側面を摩擦力軽減層で被覆せずに地肌面にしているから、レースが環状部材と相対滑りしにくくなる。これにより、レースが径方向にずれ動くことを抑制または防止できるので、レースの内径面が軸部に、あるいはレースの外径面が外筒の内周面に滑り接触しにくくなる。仮に、万一、レースが径方向にずれ動いてレースの内径面が軸部の外周面に、あるいはレースの外径面が外筒の内周面に滑り接触しても、レースの内径面あるいは外径面に摩擦力軽減層を設けているから、この滑り接触部位の摩擦抵抗を小さくできて発熱を抑制できるので、耐焼付き性が向上する。 According to the present invention, since the outer surface of the race is not covered with the frictional force reducing layer and is a ground surface, the race is less likely to slide relative to the annular member. Accordingly, since the race can be prevented or prevented from moving in the radial direction, the inner diameter surface of the race is less likely to be in sliding contact with the shaft portion, or the outer diameter surface of the race is in sliding contact with the inner peripheral surface of the outer cylinder. Even if the race is displaced in the radial direction and the inner diameter surface of the race is in sliding contact with the outer peripheral surface of the shaft, or the outer diameter surface of the race is in sliding contact with the inner peripheral surface of the outer cylinder, Since the frictional force reducing layer is provided on the outer diameter surface, the frictional resistance at the sliding contact portion can be reduced and heat generation can be suppressed, so that seizure resistance is improved.

好ましくは、上記レースにおいて、ころの軌道面を上記摩擦力軽減層で被覆していない地肌面としたものとすることができる。この場合、軌道面が地肌であるから、ころのすべりが発生しにくくなる。これにより、ころのすべりによるころ外周面の多角形状摩耗やさらには経時的なトルク増加を防止し、耐焼付き性を向上させることができる。 Preferably, in the race, the raceway surface of the roller may be a ground surface that is not covered with the friction force reducing layer. In this case, since the raceway surface is the background, it is difficult for the rollers to slip. As a result, it is possible to prevent polygonal wear on the outer peripheral surface of the roller due to roller slip and further increase in torque over time, and improve seizure resistance.

好ましくは、上記スラストころ軸受を斜板式圧縮機の斜板とシリンダとの間に介装されるものとし、この斜板のボス部およびシリンダを上記環状部材とし、斜板と一体の回転軸を上記軸部とすることができる。この斜板式圧縮機では、潤滑油が非常に少なくて潤滑条件が厳しいため、スラストころ軸受のレースの内径面が回転軸外周面に滑り接触すると、本来ならば早期に焼付きに至りやすいが、上記のようにレースの内径面に設けている摩擦力軽減層によって前記滑り接触部位の発熱を抑制できるので、早期段階での焼付き性を回避するうえで有利となる。 Preferably, the thrust roller bearing is interposed between a swash plate and a cylinder of a swash plate compressor, the boss portion of the swash plate and the cylinder are the annular members, and a rotating shaft integral with the swash plate is provided. The shaft portion can be used. In this swash plate compressor, the lubricating oil is very low and the lubrication conditions are severe, so if the inner surface of the thrust roller bearing race is in sliding contact with the outer surface of the rotating shaft, it tends to seize early. Since the heat generation at the sliding contact portion can be suppressed by the frictional force reducing layer provided on the inner diameter surface of the race as described above, it is advantageous in avoiding seizure at an early stage.

本発明のスラストころ軸受によると、レースの耐焼付き性が向上し、長寿命化に貢献できる。 According to the thrust roller bearing of the present invention, the seizure resistance of the race is improved, which can contribute to a longer life.

本発明に係る最良の実施形態を図面に基づいて説明する。図１は、スラストころ軸受の分解斜視図、図２は、スラストころ軸受を示す断面図、図３は、図２の（３）−（３）線断面の矢視図である。 The best embodiment according to the present invention will be described with reference to the drawings. 1 is an exploded perspective view of a thrust roller bearing, FIG. 2 is a cross-sectional view showing the thrust roller bearing, and FIG. 3 is a cross-sectional view taken along line (3)-(3) in FIG.

図示する単列のスラストころ軸受７は、軸方向に対向配置される第１、第２のレース１０，１１と、両レース１０，１１の間に介装される複数個のころ１２と、各ころ１２を円周方向略等間隔に配置する保持器１３とを備えている。 The single-row thrust roller bearing 7 shown in the figure includes first and second races 10 and 11 that are arranged to face each other in the axial direction, a plurality of rollers 12 that are interposed between the races 10 and 11, And a cage 13 for disposing the rollers 12 at substantially equal intervals in the circumferential direction.

保持器１３は、例えば鋼板をプレス成形して断面略Ｍ字形に形成されたものであり、外径側環状部１５と、これと同心の内径側環状部１６と、両環状部１５，１６間で円周方向複数箇所に架け渡される柱部１７と、各柱部１７の間に設けられてころ１２を非分離に収納保持するポケット１４とを備えている。各柱部１７の径方向における中間側部分１７ａと外径側部分１７ｂと内径側部分１７ｃとに、円周方向に突出して好ましくは凸形状とされたころ止め部１８，１９がそれぞれ設けられており、円周方向に隣り合う各ころ止め部１８，１９どうしの間隔Ｗ１，Ｗ２がころ１２の直径Ｒより小さく設定されている。これにより、ポケット１４からころ１２が抜け出ないようになっている。なお、ころ１２は、ポケット１４に無理嵌めすることで組み付ける。 The cage 13 is formed, for example, by pressing a steel plate so as to have a substantially M-shaped cross section, and includes an outer diameter side annular portion 15, a concentric inner diameter side annular portion 16, and both annular portions 15, 16. Are provided with a column portion 17 spanning a plurality of locations in the circumferential direction, and a pocket 14 provided between each column portion 17 for storing and holding the rollers 12 in a non-separable manner. The intermediate portions 17a, the outer diameter side portions 17b, and the inner diameter side portions 17c in the radial direction of the column portions 17 are respectively provided with roller stoppers 18, 19 that protrude in the circumferential direction and are preferably convex. The intervals W1 and W2 between the roller stoppers 18 and 19 adjacent in the circumferential direction are set smaller than the diameter R of the roller 12. This prevents the rollers 12 from coming out of the pocket 14. The rollers 12 are assembled by forcibly fitting them into the pockets 14.

ここで、二つのレース１０，１１の各外側面１０ｄ，１１ｄを除いた表面、つまり軌道面１０ａ，１１ａ、内径面１０ｂ，１１ｂ、外径面１０ｃ，１１ｃに、摩擦力軽減層１８を設けているので、以下で詳しく説明する。 Here, the frictional force reducing layer 18 is provided on the surfaces of the two races 10 and 11 excluding the outer side surfaces 10d and 11d, that is, the raceway surfaces 10a and 11a, the inner diameter surfaces 10b and 11b, and the outer diameter surfaces 10c and 11c. This will be described in detail below.

摩擦力軽減層１８は、ＭｏＳ_２（二硫化モリブデン）膜、ＤＬＣ（ダイヤモンドライクカーボン）膜、ＣｒＮ膜等のクロム系膜や、ＴｉＮ膜等のチタン系膜等とするのが好ましい。 The frictional force reducing layer 18 is preferably a chromium-based film such as a MoS ₂ (molybdenum disulfide) film, a DLC (diamond-like carbon) film, or a CrN film, or a titanium-based film such as a TiN film.

これらの成膜方法としては、例えばＰＶＤ処理法（スパッタリング法）、ＣＶＤ法、プラズマＣＶＤ法、イオンビーム形成法、イオン化蒸着法、あるいはその他の方法等、特に問わない。 These film forming methods are not particularly limited, for example, PVD treatment method (sputtering method), CVD method, plasma CVD method, ion beam forming method, ionized vapor deposition method, or other methods.

摩擦力軽減層１８は、レース１０，１１の全表面に形成してから、外側面１０ｄ，１１ｄに形成した摩擦力軽減層を旋削する等して除去してもよいし、あるいはレース１０，１１の外側面１０ｄ，１１ｄのみをマスキングしておいてレース１０，１１の全表面に形成するようにしてもよい。つまり、レース１０，１１の外側面１０ｄ，１１ｄは摩擦力軽減層１８で被覆されておらず、地肌面が露出している。 The frictional force reducing layer 18 may be formed on the entire surface of the races 10 and 11 and then removed by turning the frictional force reducing layer formed on the outer side surfaces 10d and 11d or the races 10 and 11. Only the outer side surfaces 10d and 11d may be masked and formed on the entire surface of the races 10 and 11. That is, the outer surfaces 10d and 11d of the races 10 and 11 are not covered with the frictional force reducing layer 18, and the ground surface is exposed.

摩擦力軽減層１８の膜厚は、特に問わないが、例えば２μｍ〜３μｍに設定することができる。また、摩擦力軽減層１８の表面粗さは、特に問わないが、例えば十点平均粗さＲｚ０．１以上、１．０以下の範囲に設定することができる。 The film thickness of the frictional force reducing layer 18 is not particularly limited, but can be set to 2 μm to 3 μm, for example. The surface roughness of the frictional force reducing layer 18 is not particularly limited, but can be set, for example, in a range of 10-point average roughness Rz 0.1 or more and 1.0 or less.

図３および図５を参照して、上記スラストころ軸受７の動作を説明する。例えばスラストころ軸受７を、回転軸１９のフランジ（環状部材）１９ａと非回転の環状部材２０との対向面間に介装し、図２中の矢印で示すようにアキシアル方向の予圧を付与した状態で使用する場合を例に挙げる。 The operation of the thrust roller bearing 7 will be described with reference to FIGS. For example, the thrust roller bearing 7 is interposed between the opposing surfaces of the flange (annular member) 19a of the rotating shaft 19 and the non-rotating annular member 20, and an axial preload is applied as indicated by an arrow in FIG. Take the case of use in the state as an example.

回転軸１９が回転したとき、理想的には、回転軸１９のフランジ１９ａと第１レース１０が一体的に回転する一方、第２レース１１が非回転の環状部材２０と一体的に静止すれば、ころ１２が安定して転動する。ここで、上記したように第１レース１０の外側面１０ｄと第２レース１１の外側面１１ｄとを摩擦力軽減層１８で被覆せずに地肌面にした場合、第１レース１０が回転軸１９のフランジ１９ａに、また、第２レース１１が環状部材２０に相対滑りしにくくなるので、第１レース１０や第２レース１１が径方向にずれ動くことを抑制または防止できる。そのため、両レース１０，１１の内径面１０ｂ，１１ｂが回転軸１９の外周面に滑り接触しにくくなる。 When the rotating shaft 19 rotates, ideally, the flange 19a of the rotating shaft 19 and the first race 10 rotate integrally, while the second race 11 stops integrally with the non-rotating annular member 20. The rollers 12 roll stably. Here, as described above, when the outer surface 10d of the first race 10 and the outer surface 11d of the second race 11 are not covered with the friction force reducing layer 18 and are ground, the first race 10 has the rotating shaft 19. Since the second race 11 is less likely to slide relative to the annular member 20 on the flange 19a, it is possible to suppress or prevent the first race 10 and the second race 11 from moving in the radial direction. Therefore, the inner diameter surfaces 10 b and 11 b of both the races 10 and 11 are less likely to make sliding contact with the outer peripheral surface of the rotating shaft 19.

仮に、万一、図５に示すように、第２レース１１が径方向にずれ動いてその内径面１１ｂが回転軸１９の外周面に滑り接触した場合でも、第２レース１１の内径面１１ｂに摩擦力軽減層１８を設けているから、この滑り接触部位の摩擦抵抗を小さくできて発熱を抑制できる。したがって、早期段階で焼付くことを回避するうえで有利となる。 As shown in FIG. 5, even if the second race 11 is displaced in the radial direction and the inner surface 11 b is in sliding contact with the outer peripheral surface of the rotating shaft 19, the inner surface 11 b of the second race 11 is not touched. Since the frictional force reducing layer 18 is provided, the frictional resistance at the sliding contact portion can be reduced and heat generation can be suppressed. Therefore, it is advantageous in avoiding seizing at an early stage.

以上説明したように、レース１０，１１と回転軸１９とが滑り接触しても、そこの摩擦抵抗を小さくできて発熱を抑制できるから、耐焼付き性の向上が可能になる。このようなスラストころ軸受７であれば、潤滑油の希薄な環境で使用するような場合にも有利となる。 As described above, even if the races 10 and 11 and the rotating shaft 19 are in sliding contact with each other, the frictional resistance can be reduced and the heat generation can be suppressed, so that the seizure resistance can be improved. Such a thrust roller bearing 7 is advantageous even when it is used in a dilute environment of lubricating oil.

なお、上記実施形態では、摩擦力軽減層１８を二つのレース１０，１１の各外側面１０ｄ，１１ｄを除いた表面、つまり軌道面１０ａ，１１ａ、内径面１０ｂ，１１ｂ、外径面１０ｃ，１１ｃに設けているが、要するに、レース１０，１１において回転する部材に滑り接触する可能性のある面（例えば内径面１０ｂ，１１ｂあるいは外径面１０ｃ，１１ｃ）のみに摩擦力軽減層１８を形成した図４に示すスラストころ軸受も本発明の他の実施形態となる。また、図３に示す使用形態の場合には、図５に示すようにレース１０，１１が回転軸１９に干渉するおそれがあるので、レース１０，１１についてはその内径面１０ｂ，１１ｂのみに摩擦力軽減層１８を形成すればよく、その構成を本発明の実施形態として含むことができる。この場合、軌道面１０ａ，１１ａに摩擦力軽減層１８を形成していてもよい。また、上記スラストころ軸受７は、二つのレース１０，１１を備える構成であるが、いずれか一方のレースを備えていない場合も本発明の実施形態として含む。 In the above embodiment, the frictional force reducing layer 18 is a surface excluding the outer side surfaces 10d and 11d of the two races 10 and 11, that is, the raceway surfaces 10a and 11a, the inner diameter surfaces 10b and 11b, and the outer diameter surfaces 10c and 11c. In short, the frictional force reducing layer 18 is formed only on the surfaces (for example, the inner diameter surfaces 10b and 11b or the outer diameter surfaces 10c and 11c) that may come into sliding contact with the rotating members in the races 10 and 11. The thrust roller bearing shown in FIG. 4 is another embodiment of the present invention. In the case of the usage mode shown in FIG. 3, since the races 10 and 11 may interfere with the rotating shaft 19 as shown in FIG. 5, the races 10 and 11 are frictioned only on the inner diameter surfaces 10b and 11b. What is necessary is just to form the force reduction layer 18, and the structure can be included as embodiment of this invention. In this case, the frictional force reducing layer 18 may be formed on the raceway surfaces 10a and 11a. Moreover, although the said thrust roller bearing 7 is a structure provided with the two races 10 and 11, the case where one of the races is not provided is also included as embodiment of this invention.

ところで、上記スラストころ軸受７は、例えば斜板式圧縮機や、各種の機械装置に用いることができる。 By the way, the thrust roller bearing 7 can be used in, for example, a swash plate compressor and various mechanical devices.

図６および図７を参照して、図１から図３に示すスラストころ軸受７をエアコンディショナ用コンプレッサ等の斜板式圧縮機１に用いた例を説明する。 An example in which the thrust roller bearing 7 shown in FIGS. 1 to 3 is used in a swash plate compressor 1 such as an air conditioner compressor will be described with reference to FIGS.

斜板式圧縮機１は、軸方向に並ぶ二つのシリンダ２，３にまたがって単一のピストン４を挿入し、このピストン４に回転軸５に一体に取り付けている斜板６を係合した構成であり、回転軸５を回転することによって斜板６がピストン４を軸方向に往復移動させるようになっている。 The swash plate compressor 1 has a configuration in which a single piston 4 is inserted across two cylinders 2 and 3 aligned in the axial direction, and a swash plate 6 integrally attached to the rotary shaft 5 is engaged with the piston 4. The swash plate 6 reciprocates the piston 4 in the axial direction by rotating the rotating shaft 5.

二つのシリンダ２，３のボス部２ａ，３ａと、斜板６のボス部６ａとの間に、上述したスラストころ軸受７，７が介装される。回転軸５が図３に示した回転軸１９に相当し、斜板６のボス部６ａが図３に示したフランジ１９ａに相当し、シリンダ２，３のボス部２ａ，３ａが図３に示した環状部材２０に相当している。 The thrust roller bearings 7, 7 described above are interposed between the boss portions 2 a, 3 a of the two cylinders 2, 3 and the boss portion 6 a of the swash plate 6. The rotary shaft 5 corresponds to the rotary shaft 19 shown in FIG. 3, the boss portion 6a of the swash plate 6 corresponds to the flange 19a shown in FIG. 3, and the boss portions 2a and 3a of the cylinders 2 and 3 are shown in FIG. This corresponds to the annular member 20.

上述した斜板式圧縮機１ではスラストころ軸受７，７にアキシアル方向の予圧を付与する状態で組み込まれる。図７を参照して、予圧を付与する構造の一例を説明する。 In the swash plate compressor 1 described above, the thrust roller bearings 7 and 7 are incorporated in a state in which a preload in the axial direction is applied. With reference to FIG. 7, an example of a structure for applying a preload will be described.

二つのシリンダ２，３のボス部２ａ，３ａの内端面における内径側に、環状凸部２ｂ，３ｂを、また、斜板６のボス部６ａの両端面における外径側に、環状凸部６ｂ，６ｃを、それぞれ設ける。シリンダ２，３の環状凸部２ｂ，３ｂを、第１レース１０の外面における内径側に、また、斜板６のボス部６ａの環状凸部６ｂ，６ｃを、第２レース１１の外面における外径側にそれぞれ当接し、第１レース１０と第２レース１１とを互いに近接させる向きに所要量押圧する状態に組み付ける。これによってスラストころ軸受７に所要のアキシアル荷重からなる予圧が付与される。 The annular protrusions 2b and 3b are provided on the inner diameter side of the inner end faces of the boss parts 2a and 3a of the two cylinders 2 and 3, and the annular protrusion 6b is provided on the outer diameter side of both end faces of the boss part 6a of the swash plate 6. , 6c are provided. The annular projections 2b and 3b of the cylinders 2 and 3 are disposed on the inner diameter side of the outer surface of the first race 10, and the annular projections 6b and 6c of the boss portion 6a of the swash plate 6 are disposed on the outer surface of the second race 11. The first race 10 and the second race 11 are in contact with each of the radial sides, and are assembled in a state where a required amount is pressed in a direction in which the first race 10 and the second race 11 are brought close to each other. As a result, a preload consisting of a required axial load is applied to the thrust roller bearing 7.

このような斜板式圧縮機１では、潤滑油が希薄であり、スラストころ軸受７の潤滑条件が厳しいが、レース１０，１１が回転軸５に滑り接触してもそこの摩擦抵抗を小さくできるから、斜板式圧縮機１の寿命向上に貢献できる。 In such a swash plate compressor 1, the lubricating oil is dilute and the lubrication conditions of the thrust roller bearing 7 are severe, but even if the races 10 and 11 are in sliding contact with the rotating shaft 5, the frictional resistance there can be reduced. This can contribute to the improvement of the service life of the swash plate compressor 1.

本発明の最良の実施形態に係るスラストころ軸受の分解斜視図1 is an exploded perspective view of a thrust roller bearing according to the best embodiment of the present invention. 図１のスラストころ軸受を示す断面図Sectional view showing the thrust roller bearing of FIG. 図２の（３）−（３）線断面の矢視図FIG. 2 (3)-(3) cross-sectional view taken along the line 本発明の他の実施形態のスラストころ軸受の断面図Sectional drawing of the thrust roller bearing of other embodiment of this invention. 図１のスラストころ軸受の動作説明図Operational explanation of the thrust roller bearing of FIG. 図１のスラストころ軸受を用いた斜板式圧縮機の断面図Sectional view of a swash plate compressor using the thrust roller bearing of FIG. 図６の一部を拡大した図An enlarged view of a part of FIG.

符号の説明Explanation of symbols

７…スラストころ軸受、１０…第１レース、１１…第２レース、１０ａ，１１ａ…軌道面、１０ｂ，１１ｂ…内径面、１０ｃ，１１ｃ…外径面、１０ｄ，１１ｄ…外側面、１２…ころ、１３…保持器、１８…摩擦力軽減層、１９…回転軸、１９ａ…フランジ、２０…環状部材。 7 ... Thrust roller bearings, 10 ... 1st race, 11 ... 2nd race, 10a, 11a ... raceway surface, 10b, 11b ... inner diameter surface, 10c, 11c ... outer diameter surface, 10d, 11d ... outer surface, 12 ... roller , 13 ... cage, 18 ... frictional force reducing layer, 19 ... rotating shaft, 19a ... flange, 20 ... annular member.

Claims

複数個のころと、各ころを円周方向略等間隔に配置する保持器と、各ころの軌道面を有する少なくとも一つの金属製環状板からなるレースとを備え、かつ軸方向で対向する環状部材間に配置されるスラストころ軸受であって、
上記レースの内径面および外径面のうち、該一方の環状部材に一体に設けられる軸部外周面または外筒内周面に径方向に所定のすきまを介して対向する側に、摩擦力軽減層を設け、かつ、このレースにおいて上記一方の環状部材で受けられる外側面を上記摩擦力軽減層で被覆していない地肌面としたことを特徴とするスラストころ軸受。 A ring having a plurality of rollers, a cage for arranging the rollers at substantially equal intervals in the circumferential direction, and a race made of at least one metal annular plate having a raceway surface of each roller, and facing each other in the axial direction A thrust roller bearing disposed between the members,
Of the inner diameter surface and outer diameter surface of the race, the frictional force is reduced on the side opposed to the outer peripheral surface of the shaft portion or the inner peripheral surface of the outer cylinder that is provided integrally with the one annular member via a predetermined clearance in the radial direction. A thrust roller bearing characterized in that a layer is provided and an outer surface that is received by the one annular member in the race is a ground surface that is not covered with the frictional force reducing layer.

上記レースにおいて、ころの軌道面を上記摩擦力軽減層で被覆していない地肌面としたことを特徴とする請求項１に記載のスラストころ軸受。 2. The thrust roller bearing according to claim 1, wherein in the race, the raceway surface of the roller is a ground surface not covered with the frictional force reducing layer.

斜板式圧縮機の斜板とシリンダとの間に介装されるもので、この斜板のボス部およびシリンダが上記環状部材とされ、斜板と一体の回転軸が上記軸部とされることを特徴とする請求項１または２に記載のスラストころ軸受。 The swash plate is interposed between the swash plate and the cylinder of the swash plate compressor. The boss and cylinder of the swash plate are used as the annular member, and the rotation shaft integrated with the swash plate is used as the shaft portion. The thrust roller bearing according to claim 1 or 2.