JP4470493B2 - Thrust roller bearing - Google Patents

Thrust roller bearing Download PDF

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JP4470493B2
JP4470493B2 JP2004001625A JP2004001625A JP4470493B2 JP 4470493 B2 JP4470493 B2 JP 4470493B2 JP 2004001625 A JP2004001625 A JP 2004001625A JP 2004001625 A JP2004001625 A JP 2004001625A JP 4470493 B2 JP4470493 B2 JP 4470493B2
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pocket
roller
inner corner
cage
curvature
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JP2005195086A (en
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渉 高見澤
信綱 本橋
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JTEKT Corp
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JTEKT Corp
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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
    • F16C33/46—Cages for rollers or needles
    • F16C33/467—Details of individual pockets, e.g. shape or roller retaining means
    • 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
    • F16C33/46—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
    • F16C33/547—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from two parts, e.g. two discs or rings joined together

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

Description

本発明は、複数個のころを保持器のポケットに収納したスラストころ軸受に関する。   The present invention relates to a thrust roller bearing in which a plurality of rollers are accommodated in a pocket of a cage.

このスラストころ軸受では、保持器に設けた平面視略矩形のポケット内にころを収納した構成になっている。通常、ころの転がり動作に伴い保持器の各ポケット間の各仕切り部に繰り返し干渉することに伴い、ポケットの四つの内隅に応力が集中し、そこから亀裂が発生しやすいので、ポケットの四つの内隅に丸みを付けることによって、保持器の疲労強度を向上させるようにしている。このことから、内隅の丸みは、大きくするのが好ましいが、一般的には、この内隅にころの軸方向両端縁が干渉することを回避するために、内隅の曲率半径を、ころの軸方向両端縁に設けてある丸い面取りの曲率半径よりも小さく設定している(例えば、特許文献１参照)。
特開平１０−２２０４８２号公報 This thrust roller bearing has a configuration in which the rollers are housed in a pocket having a substantially rectangular shape in plan view provided in the cage. Normally, stress is concentrated on the four inner corners of the pocket due to repeated interference with each partition between the pockets of the cage as the roller rolls, and cracks tend to occur from the pockets. The fatigue strength of the cage is improved by rounding one inner corner. For this reason, it is preferable to increase the roundness of the inner corner, but in general, in order to avoid interference between both ends of the roller in the axial direction with this inner corner, the radius of curvature of the inner corner is set to be smaller. Is set to be smaller than the radius of curvature of the round chamfer provided at both ends in the axial direction (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-220482

スラストころ軸受において、ころの面取りの曲率半径を小さくすればころの有効軌道長さを長くできるとともに加工コストの低減が可能になるが、その場合、ポケットの内隅の曲率半径を、ころの面取りの曲率半径よりもさらに小さく設定しなければ、ポケットの内隅にころの軸方向両端縁が干渉することになる。しかし、ポケットの内隅の曲率半径を小さくしすぎると、保持器の疲労強度が低下するので、好ましくない。   In thrust roller bearings, if the radius of curvature of the roller chamfer is reduced, the effective track length of the roller can be increased and the processing cost can be reduced.In this case, the radius of curvature of the inner corner of the pocket is set to be the chamfer of the roller. If the radius of curvature is not set to be smaller than the radius of curvature, both axial edges of the rollers interfere with the inner corner of the pocket. However, if the radius of curvature of the inner corner of the pocket is too small, the fatigue strength of the cage decreases, which is not preferable.

本発明のスラスト軸受は、複数のころを、円周方向複数箇所にころ収納用の平面視略矩形のポケットを有する保持器とを備えるスラストころ軸受であって、ころの軸方向両端に面取りが形成されており、保持器のポケットの内隅に丸みが付けられているとともに、ポケットを形成する内壁面に、ころの端部を受ける凸部が設けられており、ポケットの内隅の曲率半径ｒ２がころの面取りの曲率半径ｒ１以上に設定され、かつ、このポケットの内隅の曲率半径ｒ２を大きくするに従い前記凸部の突出量が大きくなるように設定されることにより、前記ころの面取りの曲率半径ｒ１に合わせて前記凸部の突出寸法αがころの面取りとポケットの内隅との干渉を避ける大きさに設定されていることを特徴とする。 A thrust bearing according to the present invention is a thrust roller bearing comprising a plurality of rollers, and cages having substantially rectangular pockets for storing rollers at a plurality of locations in the circumferential direction, and chamfered at both axial ends of the rollers. The inner corner of the pocket of the cage is rounded, and the inner wall surface that forms the pocket is provided with a convex part that receives the end of the roller. The radius of curvature of the inner corner of the pocket By setting r2 to be equal to or larger than the radius of curvature r1 of the chamfer of the roller, and to set the protrusion amount of the convex portion as the radius of curvature r2 of the inner corner of the pocket is increased, the chamfer of the roller is set. The projecting dimension α of the convex portion is set to a size that avoids interference between the chamfer of the roller and the inner corner of the pocket in accordance with the curvature radius r1.

この場合、ポケットの内隅の曲率半径ｒ２を、ころの面取りの曲率半径ｒ１以上と、従来例と逆の関係にしているので、保持器の疲労強度を向上することが可能になるうえ、ころの有効軌道長さを長くして面取りの加工時間を短縮することが可能になる。この関係では、ころの面取りがポケットの内隅に当接しやすくなるものの、これに対しては、ポケットの内壁面に設けた凸部でころの端面を受けるようにしているから、ころの面取りがポケットの内隅に干渉せずに済む。しかも、ころの端面が凸部の頂部のみに当接するので、摩擦抵抗を軽減することが可能になる。   In this case, since the curvature radius r2 of the inner corner of the pocket is opposite to the curvature radius r1 of the chamfering of the roller in the opposite relation to the conventional example, it is possible to improve the fatigue strength of the cage. It is possible to shorten the chamfering processing time by increasing the effective track length. In this relationship, the chamfering of the roller tends to come into contact with the inner corner of the pocket.On the other hand, the chamfering of the roller is not received because the convex part provided on the inner wall surface of the pocket receives the roller end face. There is no need to interfere with the inner corner of the pocket. In addition, since the end surface of the roller contacts only the top of the convex portion, it is possible to reduce the frictional resistance.

好ましくは、前記凸部は、ころの端面の中心部に当接してころをピボット支持する位置に設けられたものとすることができる。この場合、凸部にころの端面が当接したときにころが凸部でピボット支持されるので、ころの転がり抵抗を軽減することが可能になる。ピボット支持の形態としては、平面に凸部を当接させた状態や、凹部内に凸部を入れて当接させた状態など一般的に周知の形態を含む。   Preferably, the convex portion may be provided at a position where the roller is pivotally supported by contacting the center portion of the end face of the roller. In this case, since the roller is pivotally supported by the convex portion when the end surface of the roller contacts the convex portion, it is possible to reduce the rolling resistance of the roller. The form of pivot support includes generally known forms such as a state in which a convex portion is brought into contact with a flat surface and a state in which a convex portion is put into contact with a concave portion.

好ましくは、前記保持器は、一枚の環状板からなり、保持器のポケットは、その環状板を厚み方向に打ち抜いて形成されており、ポケットの内隅の丸みところの端面を受ける凸部はポケットの前記打ち抜きにより形成されたものとすることができる。   Preferably, the cage is formed of a single annular plate, and the pocket of the cage is formed by punching the annular plate in the thickness direction, and the convex portion that receives the rounded end surface of the inner corner of the pocket is formed. It may be formed by the punching of the pocket.

この場合、ポケットを形成する工程と、ポケットの内隅に丸みを付ける工程と、凸部を形成する工程とが一度で済むので、製造工数を増やさずに済み、コスト低減に有効となる。また、ポケットの打ち抜き金型の抜き形状を管理するだけで、ポケットの内隅における丸みを簡単かつ精度よく形成できるようになるとともに凸部の配置を簡単かつ精度よく行うことができるようになる。   In this case, the process of forming the pocket, the process of rounding the inner corner of the pocket, and the process of forming the convex portion are all performed once, so that it is not necessary to increase the number of manufacturing steps, which is effective for cost reduction. Further, by managing the punching shape of the pocket punching die, it becomes possible to easily and accurately form the roundness at the inner corner of the pocket and to arrange the convex portions easily and accurately.

本発明では、保持器の疲労強度ならびにころによる負荷容量を向上し、軸受寿命、信頼性を向上できる。   In the present invention, the fatigue strength of the cage and the load capacity due to the rollers can be improved, and the bearing life and reliability can be improved.

以下、本発明の最良の実施の形態を図面に基づいて説明する。図１は、スラストころ軸受を示す平面図、図２は、図１の保持器のポケット周辺を拡大して示す斜視図、図３は、図１の保持器のポケット周辺を拡大して示す平面図、図４は、図３の（４）−（４）線断面の矢視図、図５は、図３の（５）−（５）線断面の矢視図、図６は、図３の一部を拡大した図である。   The best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a plan view showing a thrust roller bearing, FIG. 2 is an enlarged perspective view showing the vicinity of the pocket of the cage shown in FIG. 1, and FIG. 3 is an enlarged plan view showing the periphery of the pocket of the cage shown in FIG. 4 is a cross-sectional view taken along line (4)-(4) in FIG. 3, FIG. 5 is a cross-sectional view taken along line (5)-(5) in FIG. 3, and FIG. It is the figure which expanded a part of.

これらの図に示される実施形態のスラストころ軸受１は、保持器２と、複数のころ３とから構成されている。保持器２は、一枚の環状板から製作されたものであり、その径方向途中領域には、径方向に波打つ形状の波状屈曲部４が絞り加工により設けられている。この波状屈曲部４は、径方向交互に保持器２の厚み方向（軸方向）一方と他方とにほぼ均等な長さで張り出された外径側と内径側の各張り出し部４ａ，４ｂと、両張り出し部４ａ，４ｂの径方向中間に位置する中間側張り出し部４ｃとからなる。外径側と内径側の両張り出し部４ａ，４ｂは保持器２の厚み方向一方に、また、中間側張り出し部４ｃは厚み方向他方にそれぞれ張り出されている。   The thrust roller bearing 1 of the embodiment shown in these drawings is constituted by a cage 2 and a plurality of rollers 3. The cage 2 is manufactured from a single annular plate, and a wavy bent portion 4 having a shape that undulates in the radial direction is provided by drawing in a midway region in the radial direction. The wavy bent portion 4 is formed by extending the outer diameter side and the inner diameter side overhanging portions 4a and 4b, which are bulged in the thickness direction (axial direction) one and the other of the cage 2 alternately in the radial direction. The intermediate overhanging portion 4c is located in the radial direction between the overhanging portions 4a and 4b. Both projecting portions 4a and 4b on the outer diameter side and inner diameter side project in one thickness direction of the cage 2, and the intermediate projecting portion 4c projects in the other thickness direction.

上記保持器２の波状屈曲部４において外径側の屈曲起点から内径側の屈曲起点までの範囲の円周方向複数箇所には、平面視略矩形のポケット５が厚み方向に打ち抜き形成されている。この各ポケット５に、ころ３が回動自在な状態で当該ポケット５から非分離に収納されている。この非分離の収納構造を説明すると、ポケット５の内壁面において円周方向左右に位置する外径側張り出し部４ａ、内径側張り出し部４ｂおよび中間側張り出し部４ｃの各張り出し方向の頂点部分の計三ヶ所に、ポケット５内へ向けて突出する爪７ａ，７ｂ，７ｃが設けられている。この爪７ａ，７ｂ，７ｃによって、各ポケット５において径方向の三ヶ所での周方向幅の寸法がころ３の直径寸法よりも小さくなっており、これによってポケット５内からころ３が抜け出ないようになっている。なお、ポケット５にころ３は、無理嵌めされることで当該ポケット５に非分離に収納される。   In the wavy bent portion 4 of the cage 2, pockets 5 having a substantially rectangular shape in plan view are punched in the thickness direction at a plurality of locations in the circumferential direction from the bending start point on the outer diameter side to the bending start point on the inner diameter side. . In each pocket 5, the roller 3 is stored in a non-separable manner from the pocket 5 in a rotatable state. The non-separated storage structure will be described. The sum of the apex portions of the outer diameter side overhanging portion 4a, the inner diameter side overhanging portion 4b, and the intermediate side overhanging portion 4c located on the inner wall surface of the pocket 5 on the left and right sides in the circumferential direction. Claws 7a, 7b, 7c projecting into the pocket 5 are provided at three locations. By the claws 7a, 7b, 7c, the circumferential width at three locations in the radial direction in each pocket 5 is smaller than the diameter of the roller 3, so that the roller 3 does not come out of the pocket 5. It has become. The rollers 3 are forcibly fitted in the pockets 5 and are stored in the pockets 5 in a non-separable manner.

ころ３は、その端面の形状が平面形と呼ばれるタイプであり、その軸方向両端縁を丸く面取りされている。この面取り部分に符号３ａを付している。   The roller 3 is of a type in which the shape of its end face is called a planar shape, and its both axial edges are rounded and chamfered. The chamfered portion is denoted by reference numeral 3a.

保持器２において、ポケット５を形成する内壁面における四つの内隅５ａには、丸みが付けられている。   In the cage 2, the four inner corners 5 a on the inner wall surface forming the pocket 5 are rounded.

ここでは、ころ３の面取り３ａの曲率半径ｒ１と、ポケット５の内隅５ａの曲率半径ｒ２との関係を、ｒ１≦ｒ２、好ましくは、ｒ１＜ｒ２に設定している。   Here, the relationship between the radius of curvature r1 of the chamfer 3a of the roller 3 and the radius of curvature r2 of the inner corner 5a of the pocket 5 is set to r1 ≦ r2, preferably r1 <r2.

この関係では、ころ３の面取り３ａがポケット５の内隅５ａに干渉しやすくなる。そこで、この干渉を避けるため、ポケット５の内壁面のうち外径側と内径側の各壁面部分にポケット５内へ向けて突出する凸部８，９を設け、ころ３の面取り３ａがポケット５の内隅５ａに当接する前に凸部８，９でころ３の軸方向内外の端面を受けるようにしている。   In this relationship, the chamfer 3 a of the roller 3 easily interferes with the inner corner 5 a of the pocket 5. Therefore, in order to avoid this interference, convex portions 8 and 9 protruding toward the inside of the pocket 5 are provided on each of the inner wall surfaces of the pocket 5 on the outer diameter side and the inner diameter side. Before contacting the inner corner 5a of the roller 3, the projections 8 and 9 receive the inner and outer end surfaces of the roller 3 in the axial direction.

この場合、好ましくは、凸部８，９は、ころ３の軸方向外端面や軸方向内端面の中心部に当接してころ３をピボット支持する位置に設けられている。この凸部８，９は、平面的に見て丸く湾曲した形状になっており、凸部８，９の突出寸法αは、この凸部８，９にころ３の端面が当接した状態において、ころ３の面取り３ａがポケット５の内隅５ａに当接しないように設定される。   In this case, preferably, the convex portions 8 and 9 are provided at a position where the rollers 3 are pivotally supported by abutting against the axially outer end surface of the roller 3 or the central portion of the axially inner end surface. The projections 8 and 9 are round and curved when viewed in plan, and the projection dimension α of the projections 8 and 9 is such that the end surface of the roller 3 is in contact with the projections 8 and 9. The chamfer 3 a of the roller 3 is set so as not to contact the inner corner 5 a of the pocket 5.

次に、保持器２の製造手順の一例を説明する。   Next, an example of the manufacturing procedure of the cage 2 will be described.

最初に、一枚の金属板（ＪＩＳ規格ＳＰＣＤなど）の所定部位に中心孔を打ち抜き形成してから、絞り加工を施すことにより波状屈曲部４を形成する。この後、ポケット５を打ち抜き形成してから、外形部分を切り取る。このポケット５の形成と同時にポケット５の内隅５ａが丸く形成されるとともに、凸部８，９および爪７ａ〜７ｃが形成される。そのために、ポケット５の打ち抜き金型の形状としては、予め丸い内隅５ａ、凸部８，９、爪７ａ〜７ｃを含むポケット５の形状に対応して製作している。このような手順を採用すれば、ポケット５の内隅５ａ、凸部８，９、爪７ａ〜７ｃをそれぞれ別々に独立して形成する手間が不要となるから、保持器２の製造工程数を増やす必要がないうえ、ポケット５の打ち抜き金型の抜き形状を管理するだけで簡単に精度よく形成できるようになる。   First, after a center hole is punched and formed in a predetermined portion of a single metal plate (JIS standard SPCD or the like), the wavy bent portion 4 is formed by drawing. Thereafter, the pocket 5 is punched and formed, and then the outer portion is cut out. Simultaneously with the formation of the pocket 5, the inner corner 5a of the pocket 5 is formed round, and the convex portions 8, 9 and the claws 7a to 7c are formed. Therefore, the punching die of the pocket 5 is manufactured in advance corresponding to the shape of the pocket 5 including the round inner corner 5a, the convex portions 8 and 9, and the claws 7a to 7c. If such a procedure is adopted, the labor for forming the inner corner 5a, the convex portions 8 and 9, and the claws 7a to 7c of the pocket 5 independently becomes unnecessary. It is not necessary to increase the number, and the shape can be easily and accurately formed only by managing the punching shape of the punch 5.

以上説明したように、ポケット５の内隅５ａの曲率半径ｒ２を、ころ３の面取り３ａの曲率半径ｒ１以上と、従来例と逆の関係にしているので、ポケット５の内隅５ａの曲率半径ｒ２を可及的に大きくすることにより保持器２の疲労強度を向上することが可能になるうえ、ころ３の面取り３ａの曲率半径ｒ１を可及的に小さくすることによりころ３の有効軌道長さを長くして負荷容量を増大することが可能になるとともに加工時間を短縮してコストを低減することが可能になる。なお、ころ３の面取り３ａはバレル加工などで行うが、面取り３ａの曲率半径ｒ１を小さくすることによって、バレル加工に要する時間を短縮できるので、コスト低減に貢献できる。   As described above, the curvature radius r2 of the inner corner 5a of the pocket 5 is opposite to the curvature radius r1 of the chamfer 3a of the roller 3 as compared with the conventional example, so that the curvature radius of the inner corner 5a of the pocket 5 is reversed. By increasing r2 as much as possible, it is possible to improve the fatigue strength of the cage 2, and by making the radius of curvature r1 of the chamfer 3a of the roller 3 as small as possible, the effective track length of the roller 3 is increased. The load capacity can be increased by increasing the length, and the processing time can be shortened to reduce the cost. Although the chamfering 3a of the roller 3 is performed by barrel processing or the like, the time required for barrel processing can be shortened by reducing the curvature radius r1 of the chamfering 3a, which can contribute to cost reduction.

通常、スラストころ軸受１では、回転遠心力の作用でころ３がポケット５内において径方向外向きに付勢されるが、スラストころ軸受１が偏心回転するような状況では、ころ３の軸方向外端面がポケット５の内壁面の外径側に設けてある凸部８に当接したり、ころ３の軸方向内端面がポケット５の内壁面の内径側に設けてある凸部９に当接したりする。いずれの場合でも、ころ３の端面がまずポケット５の内壁面に設けた凸部８，９に当接して、ころ３の面取り３ａがポケット５の内隅５ａに当接しない。しかも、ころ３の端面と外径側の凸部８や内径側の凸部９との当接状態については、ころ３の端面の略中心部が凸部８や凸部９の頂部に当接してピボット支持されるので、この当接部分の摩擦抵抗が略ゼロになり、フリクションロスが軽減される。   Normally, in the thrust roller bearing 1, the roller 3 is urged radially outward in the pocket 5 by the action of the rotational centrifugal force. However, in the situation where the thrust roller bearing 1 rotates eccentrically, the axial direction of the roller 3 The outer end surface abuts on the convex portion 8 provided on the outer diameter side of the inner wall surface of the pocket 5, or the axial inner end surface of the roller 3 abuts on the convex portion 9 provided on the inner diameter side of the inner wall surface of the pocket 5. Or In any case, the end face of the roller 3 first comes into contact with the convex portions 8 and 9 provided on the inner wall surface of the pocket 5, and the chamfer 3 a of the roller 3 does not come into contact with the inner corner 5 a of the pocket 5. In addition, with respect to the contact state between the end surface of the roller 3 and the convex portion 8 on the outer diameter side or the convex portion 9 on the inner diameter side, the substantially central portion of the end surface of the roller 3 contacts the convex portion 8 or the top of the convex portion 9. Therefore, the frictional resistance at the contact portion becomes substantially zero, and the friction loss is reduced.

ここで、ポケット５の内隅５ａの曲率半径ｒ２と、ポケット５の内隅５ａに発生する応力との関係を調べたので、以下で説明する。   Here, the relationship between the radius of curvature r2 of the inner corner 5a of the pocket 5 and the stress generated in the inner corner 5a of the pocket 5 has been examined, and will be described below.

ころ３が転がり動作するときに保持器２の波状屈曲部４に干渉することにより、前記内隅に応力が集中して発生するが、ポケット５の内隅５ａの曲率半径ｒ２と、内隅５ａに発生する応力との関係を表１に示す。また、内隅５ａの曲率半径ｒ２に応じて、ころ３の面取り３ａをポケット５の内隅５ａに当接させないために必要な凸部８，９の突出寸法αを表１に示している。なお、ころ３の面取り３ａの曲率半径ｒ１を０．１ｍｍで一定としている。   When the roller 3 rolls and interferes with the wave-like bent portion 4 of the cage 2, stress concentrates on the inner corner, but the radius of curvature r2 of the inner corner 5a of the pocket 5 and the inner corner 5a Table 1 shows the relationship with the stress generated in the film. Table 1 shows the projection dimension α of the protrusions 8 and 9 necessary for preventing the chamfer 3a of the roller 3 from coming into contact with the inner corner 5a of the pocket 5 according to the curvature radius r2 of the inner corner 5a. The curvature radius r1 of the chamfer 3a of the roller 3 is constant at 0.1 mm.

Figure 0004470493
この表から判るように、ポケット５の内隅５ａの曲率半径ｒ２を大きくする程、内隅５ａに発生する応力が小さくなっており、保持器２の疲労強度が向上する。よって、要求される疲労強度に応じて、内隅５ａの曲率半径ｒ２を適宜設定し、さらに、凸部８，９の突出寸法αを、ころ３の面取り３ａの曲率半径ｒ１および内隅５ａの曲率半径ｒ２に応じて適宜設定すればよい。
Figure 0004470493
 As can be seen from this table, as the radius of curvature r2 of the inner corner 5a of the pocket 5 is increased, the stress generated in the inner corner 5a is reduced, and the fatigue strength of the cage 2 is improved. Accordingly, the curvature radius r2 of the inner corner 5a is appropriately set according to the required fatigue strength, and the protrusion dimension α of the convex portions 8 and 9 is set to the curvature radius r1 of the chamfer 3a of the roller 3 and the inner corner 5a. What is necessary is just to set suitably according to the curvature radius r2.

このようなスラストころ軸受１を例えば自動車の変速機に用いた場合、変速機の回転トルクを軽減できるようになる。   When such a thrust roller bearing 1 is used, for example, in an automobile transmission, the rotational torque of the transmission can be reduced.

図７から図９に本発明の実施形態２を示している。この実施形態２では、保持器２を二枚の環状板２Ａ，２Ｂを掌合結合した構成としている。   7 to 9 show a second embodiment of the present invention. In the second embodiment, the cage 2 has a structure in which two annular plates 2A and 2B are joined together.

具体的に、二つの環状板２Ａ，２Ｂにおいて径方向途中領域で厚み方向に合致する領域に、互いに離れる側に張り出す波状屈曲部４ｄ，４ｅが設けられている。これら二つの環状板２Ａ，２Ｂの各波状屈曲部４ｄ，４ｅにおいて外径側の屈曲起点から内径側の屈曲起点までの範囲で円周方向の複数箇所には、平面的に見て矩形のポケット５Ａ，５Ｂが厚み方向に打ち抜き形成されている。これら二つの環状板２Ａ，２Ｂの両ポケット５Ａ，５Ｂを組み合わせて、ころ３を収納するポケットが構成されている。   Specifically, in the two annular plates 2A and 2B, wavy bent portions 4d and 4e projecting to the side away from each other are provided in regions that are in the radial direction and coincide with the thickness direction. In each of the wavy bent portions 4d and 4e of the two annular plates 2A and 2B, rectangular pockets in a plan view are provided at a plurality of locations in the circumferential direction from the bending start point on the outer diameter side to the bending start point on the inner diameter side. 5A and 5B are formed by punching in the thickness direction. A pocket for storing the rollers 3 is formed by combining the pockets 5A and 5B of the two annular plates 2A and 2B.

また、二つの環状板２Ａ，２Ｂの各波状屈曲部４ｄ，４ｅの各張り出し頂点部分に、ポケット５Ａ，５Ｂ内へ向けて突出する爪７ｄ，７ｅが設けられている。この爪７ｄ，７ｅによって、各ポケット５Ａ，５Ｂの径方向の一ヶ所がころ３の直径寸法よりも幅狭になっており、これによってポケット５Ａ，５Ｂ内からころ３が抜け出ないようになっている。   In addition, claws 7d and 7e projecting into the pockets 5A and 5B are provided at the projecting apex portions of the wavy bent portions 4d and 4e of the two annular plates 2A and 2B. Due to the claws 7d and 7e, one portion in the radial direction of each pocket 5A and 5B is narrower than the diameter dimension of the roller 3, thereby preventing the roller 3 from coming out of the pocket 5A and 5B. Yes.

特に、この実施形態２では、第１環状板２Ａの波状屈曲部４ｄの張り出し寸法を、第２環状板２Ｂの波状屈曲部４ｅの張り出し寸法よりも大きく設定することにより、ポケット５Ａ，５Ｂ内にころ３を収納した状態で、ころ３の回転中心を、第１環状板２Ａの厚み方向中心と合致させようにして、第２環状板２Ｂの厚み方向中心をころ３の回転中心からオフセットさせるようにしている。   In particular, in the second embodiment, by setting the projecting dimension of the wavy bent part 4d of the first annular plate 2A to be larger than the projecting dimension of the wavy bent part 4e of the second annular plate 2B, the pockets 5A and 5B With the roller 3 housed, the center of rotation of the roller 3 is made to coincide with the center of the first annular plate 2A in the thickness direction, and the center of the second annular plate 2B in the thickness direction is offset from the center of rotation of the roller 3. I have to.

そして、二つの環状板２Ａ，２Ｂのうち、ころ３の回転中心と一致させた第１環状板２Ａのポケット５Ａの内壁面において外径側と内径側とに、凸部８，９が設けられている。この凸部８，９は、第１環状板２Ａにポケット５Ａを打ち抜き形成するときに同時に形成される。   And the convex part 8 and 9 are provided in the outer-diameter side and inner-diameter side in the inner wall surface of the pocket 5A of the 1st annular plate 2A made to correspond with the rotation center of the roller 3 among two annular plates 2A and 2B. ing. The convex portions 8 and 9 are formed at the same time when the pocket 5A is punched and formed in the first annular plate 2A.

なお、二つの環状板２Ａ，２Ｂの結合は、軸方向隣り合わせに掌合させた状態で、第２環状板２Ｂの内径部分を第１環状板２Ａの内径部分に引っ掛けるように折り曲げてかしめることによって行われている。前記かしめは、第２環状板２Ｂの外径側のみ、または内径側と外径側の両方に施すこともできる。   Note that the two annular plates 2A and 2B are joined by being bent so that the inner diameter portion of the second annular plate 2B is hooked on the inner diameter portion of the first annular plate 2A in a state where the two annular plates 2A and 2B are axially adjacent to each other. Has been done by. The caulking can be performed only on the outer diameter side of the second annular plate 2B or on both the inner diameter side and the outer diameter side.

このような実施形態２の場合も、上記実施形態１と同様、各ポケット５Ａ，５Ｂの丸い内隅５ａ，５ｂの曲率半径ｒ２と、ころ３の丸い面取り３ａの曲率半径ｒ１との関係をｒ１≦ｒ２に設定し、かつ、各ポケット５Ａ，５Ｂの内隅５ａ，５ｂの曲率半径ｒ２と、凸部８，９の突出寸法αとを適宜特定する。   Also in the second embodiment, as in the first embodiment, the relationship between the curvature radius r2 of the round inner corners 5a and 5b of the pockets 5A and 5B and the curvature radius r1 of the round chamfer 3a of the roller 3 is r1. ≦ r2 is set, and the radius of curvature r2 of the inner corners 5a and 5b of the pockets 5A and 5B and the protruding dimension α of the convex portions 8 and 9 are appropriately specified.

なお、本発明は上述した実施形態１、２に限定されるものではない。例えば図示しないが、ポケット５，５Ａの内壁面の外径側にのみ凸部８を設けたもの、つまりポケット５，５Ａの内壁面の内径側に凸部９を設けないようにしたものも本発明に含まれる。   The present invention is not limited to the first and second embodiments described above. For example, although not shown in the drawings, the projections 8 are provided only on the outer diameter side of the inner wall surfaces of the pockets 5 and 5A, that is, the projections 9 are not provided on the inner diameter side of the inner wall surfaces of the pockets 5 and 5A. Included in the invention.

本発明の実施形態１に係るスラストころ軸受を示す平面図The top view which shows the thrust roller bearing which concerns on Embodiment 1 of this invention. 図１の保持器のポケット周辺を拡大して示す斜視図The perspective view which expands and shows the pocket periphery of the holder | retainer of FIG. 図１の保持器のポケット周辺を拡大して示す平面図The top view which expands and shows the pocket periphery of the holder | retainer of FIG. 図３の（４）−（４）線断面の矢視図Arrow view of section of line (4)-(4) in FIG. 図３の（５）−（５）線断面の矢視図3 is a cross-sectional view taken along line (5)-(5) in FIG. 図３の一部を拡大した図An enlarged view of a part of FIG. 本発明の実施形態２に係るスラストころ軸受で、図４に対応する図FIG. 4 is a view corresponding to FIG. 4 showing a thrust roller bearing according to Embodiment 2 of the present invention. 図７の保持器のポケット周辺を拡大して上から見た平面図The top view which expanded the pocket circumference of the cage of Drawing 7, and was seen from the top 図７の保持器のポケット周辺を拡大して下から見た平面図The top view which expanded the pocket circumference of the cage of Drawing 7, and was seen from the bottom

符号の説明Explanation of symbols

１ スラストころ軸受
２ 保持器
３ ころ
３ａ ころの面取り
５ 保持器のポケット
５ａ ポケットの内隅
８ 外径側の凸部
９ 内径側の凸部
DESCRIPTION OF SYMBOLS 1 Thrust roller bearing 2 Cage 3 Roller 3a Chamfer of roller 5 Cage pocket 5a Inner corner of pocket 8 Convex part on outer diameter side 9 Convex part on inner diameter side

Claims (3)

複数のころを、円周方向複数箇所にころ収納用の平面視略矩形のポケットを有する保持器とを備えるスラストころ軸受であって、
ころの軸方向両端に面取りが形成されており、
保持器のポケットの内隅に丸みが付けられているとともに、ポケットを形成する内壁面に、ころの端部を受ける凸部が設けられており、
ポケットの内隅の曲率半径ｒ２がころの面取りの曲率半径ｒ１以上に設定され、かつ、このポケットの内隅の曲率半径ｒ２を大きくするに従い前記凸部の突出量が大きくなるように設定されることにより、前記ころの面取りの曲率半径ｒ１に合わせて前記凸部の突出寸法αがころの面取りとポケットの内隅との干渉を避ける大きさに設定されている、ことを特徴とするスラストころ軸受。 A thrust roller bearing comprising a plurality of rollers, and a cage having a substantially rectangular pocket for storing rollers at a plurality of locations in the circumferential direction,
Chamfers are formed at both axial ends of the rollers,
The inner corner of the pocket of the cage is rounded, and the inner wall surface forming the pocket is provided with a convex portion that receives the end of the roller,
The radius of curvature r2 of the inner corner of the pocket is set to be equal to or larger than the radius of curvature r1 of the chamfer of the roller, and the protruding amount of the convex portion is set to increase as the radius of curvature r2 of the inner corner of the pocket is increased. Thus , the thrust roller is characterized in that the projection dimension α of the convex portion is set to a size that avoids interference between the chamfer of the roller and the inner corner of the pocket in accordance with the radius of curvature r1 of the chamfer of the roller. bearing. 前記凸部は、ころの端面の中心部に当接してころをピボット支持する位置に設けられている、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 the convex portion is provided at a position where the roller contacts the central portion of the end face of the roller and pivotally supports the roller. 前記保持器は、一枚の環状板からなり、
保持器のポケットは、その環状板を厚み方向に打ち抜いて形成されており、
ポケットの内隅の丸みところの端面を受ける凸部はポケットの前記打ち抜きにより形成されている、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 cage is composed of a single annular plate,
The pocket of the cage is formed by punching the annular plate in the thickness direction,
The thrust roller bearing according to claim 1 or 2, wherein a convex portion that receives an end surface of a rounded inner corner of the pocket is formed by punching the pocket.
JP2004001625A 2004-01-07 2004-01-07 Thrust roller bearing Expired - Lifetime JP4470493B2 (en)

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