JP4471864B2 - Ball bearing - Google Patents

Ball bearing Download PDF

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JP4471864B2
JP4471864B2 JP2005042388A JP2005042388A JP4471864B2 JP 4471864 B2 JP4471864 B2 JP 4471864B2 JP 2005042388 A JP2005042388 A JP 2005042388A JP 2005042388 A JP2005042388 A JP 2005042388A JP 4471864 B2 JP4471864 B2 JP 4471864B2
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annular body
ball
pocket
annular
ball bearing
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JP2006226448A (en
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健一郎 内藤
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NTN Corp
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NTN 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F16C33/3862—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages comprising two annular parts joined together
    • F16C33/3875—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages comprising two annular parts joined together made from plastic, e.g. two injection moulded parts joined by a snap fit
    • 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
    • F16C33/38—Ball cages
    • F16C33/3887—Details of individual pockets, e.g. shape or ball 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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6607—Retaining the grease in or near the bearing
    • F16C33/6614—Retaining the grease in or near the bearing in recesses or cavities provided in retainers, races or rolling elements
    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/52—Polyphenylene sulphide [PPS]
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/60—Polyamides [PA]
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • F16C2226/70—Positive connections with complementary interlocking parts
    • F16C2226/74—Positive connections with complementary interlocking parts with snap-fit, e.g. by clips

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

Description

この発明は、合成樹脂製保持器を組み込んだ玉軸受に関する。   The present invention relates to a ball bearing incorporating a synthetic resin cage.

合成樹脂製保持器を組み込んだ玉軸受として、下記特許文献１に記載されたものが知られている。この玉軸受の合成樹脂製保持器は、軸方向に向き合う２枚の環状体からなり、各環状体の対向面にはボールを収容する半球状のポケットが周方向に等間隔に形成され、隣り合うポケット間には軸方向に突出する係合爪と、その係合爪を係合させる係合孔とが設けられている。   As a ball bearing incorporating a synthetic resin cage, one described in Patent Document 1 below is known. The synthetic resin cage of this ball bearing is composed of two annular bodies facing each other in the axial direction, and hemispherical pockets for accommodating the balls are formed at equal intervals in the circumferential direction on the opposing surface of each annular body. An engaging claw that protrudes in the axial direction and an engaging hole that engages the engaging claw are provided between the matching pockets.

しかし、この保持器は、ポケット内にグリースが入りにくい構造なので、高速回転域におけるポケット面とボールの間の潤滑状態が好ましくない。そのため、この保持器を組み込んだ玉軸受は、ポケット面とボールの摩擦によって摩擦音を生じたり、ポケット面が摩耗して生じた摩耗粉によってグリースを早く劣化させるという問題があった。また、ポケット面の摩耗によってポケット面とボールの隙間が大きくなり、ポケット面とボールの衝突音が増加するという問題もあった。さらに、ポケット面とボールの接触により摩擦熱が生じ、その摩擦熱により軸受の温度が上昇するという問題もあった。   However, since this cage has a structure in which grease does not easily enter the pocket, the lubrication state between the pocket surface and the ball in the high-speed rotation region is not preferable. For this reason, ball bearings incorporating this cage have problems in that they generate frictional noise due to the friction between the pocket surface and the ball, and the grease deteriorates quickly due to wear powder generated by wear of the pocket surface. In addition, there is a problem that the pocket surface and the ball have a large gap due to wear of the pocket surface, and the impact noise between the pocket surface and the ball increases. Further, frictional heat is generated by the contact between the pocket surface and the ball, and the temperature of the bearing rises due to the frictional heat.

この問題を解消するために、図９に示すように、グリース溜りをなす凹部５０をポケット５１の両端に形成してポケット５１の内面とボール５２とを潤滑すると、ボール５２の一部が凹部５０に入り、凹部５０の縁と接触する。ボール５２が凹部５０の縁と接触すると、環状体５３ａ、５３ｂを離反させる力が係合爪５４に作用し、その繰り返しにより係合爪５４が摩耗して環状体５３ａ、５３ｂの間にガタを生じる。ガタが生じると、そのガタによりポケット５１が変形してボール５２からポケット５１の内面までの隙間が大きくなり、この隙間の増大によってポケット５１の内面とボール５２の衝突音が大きくなったり、ボール５２に対する保持器の動き量が大きくなるという問題が生じる。   In order to solve this problem, as shown in FIG. 9, when recesses 50 that form a grease pool are formed at both ends of the pocket 51 and the inner surface of the pocket 51 and the ball 52 are lubricated, a part of the ball 52 is recessed. Enters and contacts the edge of the recess 50. When the ball 52 comes into contact with the edge of the recess 50, a force that separates the annular bodies 53a and 53b acts on the engaging claws 54, and the engagement claws 54 are worn due to repetition of the force and play between the annular bodies 53a and 53b. Arise. When the play occurs, the pocket 51 is deformed by the play, and a gap from the ball 52 to the inner surface of the pocket 51 is increased. Due to the increase in the gap, a collision sound between the inner surface of the pocket 51 and the ball 52 increases. This causes a problem that the amount of movement of the cage with respect to is increased.

特開２００３−３４３５７１号公報JP 2003-343571 A

この発明が解決しようとする課題は、高速回転域においてもボールとの接触による摩擦音、摩耗粉、衝突音、および摩擦熱を生じにくく、しかも合成樹脂製保持器の係合爪が摩耗しにくい玉軸受を提供することである。   The problem to be solved by the present invention is a ball that is less likely to generate frictional noise, wear powder, collision noise, and frictional heat due to contact with the ball even in a high-speed rotation range, and that the engaging claws of the synthetic resin cage are less likely to wear. It is to provide a bearing.

上記の課題を解決するために、軸方向に向き合う２枚の環状体の対向面にボールを収容する半球状のポケットを周方向に等間隔に形成し、軸方向に突出する係合爪を一方の前記環状体の隣り合うポケット間に設け、その係合爪を挿入する係合孔を他方の前記環状体の隣り合うポケット間に形成し、前記係合孔に挿入した前記係合爪を前記他方の環状体に係合させて前記２枚の環状体を結合する合成樹脂製保持器を有し、その合成樹脂製保持器で内輪と外輪の間のボールを保持する玉軸受において、グリース溜りをなす凹部を前記各環状体の前記ポケットの両端に形成し、前記各環状体の合わせ目に前記ボールが接触するようにした。   In order to solve the above problems, hemispherical pockets for accommodating balls are formed at equal intervals in the circumferential direction on the opposing surfaces of the two annular members facing in the axial direction, and the engaging claws protruding in the axial direction are Provided between adjacent pockets of the annular body, an engaging hole for inserting the engaging claw is formed between adjacent pockets of the other annular body, and the engaging claw inserted into the engaging hole is In a ball bearing having a synthetic resin cage that engages with the other annular body and couples the two annular bodies, and that holds the ball between the inner ring and the outer ring with the synthetic resin cage, Are formed at both ends of the pocket of each annular body so that the ball contacts the joint of each annular body.

この玉軸受は、次の構成を加えるとより好ましいものとなる。
１）前記凹部を前記環状体の内周から外周に至らせて形成し、一方の前記環状体の前記凹部と他方の前記環状体の前記凹部の合わせ目に前記ボールが接触するようにする。
２）前記凹部を内周側に片寄った位置と外周側に片寄った位置の一方または両方に形成し、一方の前記環状体のポケット面と他方の前記環状体のポケット面の合わせ目に前記ボールが接触するようにする。
３）前記凹部を内周と外周の中間位置に形成し、一方の前記環状体の前記凹部の縁と他方の前記環状体の前記凹部の縁の合わせ目に前記ボールが接触するようにする。 This ball bearing becomes more preferable when the following configuration is added.
1) The recess is formed so as to extend from the inner periphery to the outer periphery of the annular body, and the ball is brought into contact with the joint of the recess of one of the annular bodies and the recess of the other annular body.
2) The concave portion is formed at one or both of a position offset toward the inner peripheral side and a position offset toward the outer peripheral side, and the ball is formed at the joint between the pocket surface of one annular body and the pocket surface of the other annular body. To make contact.
3) The concave portion is formed at an intermediate position between an inner periphery and an outer periphery, and the ball is brought into contact with a joint between the edge of the concave portion of one annular body and the edge of the concave portion of the other annular body.

グリース溜りに保持されたグリースがボールとポケット面を潤滑して、高速回転域における摩擦音、摩耗粉、衝突音、および摩擦熱の発生を抑制する。また、ボールが各環状体の合わせ目に接触するので、各環状体に軸方向の分力が生じない。そのため、環状体を離反させる力が係合爪に作用せず、係合爪が摩耗しにくい。   The grease held in the grease reservoir lubricates the ball and pocket surface, and suppresses the generation of frictional noise, wear powder, collision noise, and frictional heat in the high-speed rotation range. Further, since the ball contacts the joint of each annular body, no axial component force is generated in each annular body. Therefore, the force for separating the annular body does not act on the engaging claws, and the engaging claws are not easily worn.

図１に、この発明の玉軸受の第１実施形態を示す。この玉軸受は、内輪１と、外輪２と、内輪１と外輪２の間に組み込まれたボール３と、ボール３を保持する保持器４とを有する。また、この玉軸受にはシール部材５が組み込まれており、このシール部材５が内輪１と外輪２の間に封入されたグリースの漏れを防いでいる。   FIG. 1 shows a first embodiment of the ball bearing of the present invention. This ball bearing has an inner ring 1, an outer ring 2, a ball 3 incorporated between the inner ring 1 and the outer ring 2, and a cage 4 that holds the ball 3. A seal member 5 is incorporated in the ball bearing, and the seal member 5 prevents leakage of grease sealed between the inner ring 1 and the outer ring 2.

保持器４は、図２に示すように軸方向に向き合う２枚の環状体６ａ、６ｂからなる。環状体６ａ、６ｂの対向面には半球状のポケット７が形成されており、このポケット７にボール３が収容される。ポケット７は、図３に示すように周方向に等間隔に形成されており、隣り合うポケット７、７の間には、係合爪８と係合孔９が形成されている。   As shown in FIG. 2, the cage 4 is composed of two annular bodies 6a and 6b facing each other in the axial direction. A hemispherical pocket 7 is formed on the opposing surfaces of the annular bodies 6 a and 6 b, and the ball 3 is accommodated in the pocket 7. As shown in FIG. 3, the pockets 7 are formed at equal intervals in the circumferential direction, and an engaging claw 8 and an engaging hole 9 are formed between the adjacent pockets 7, 7.

環状体６ａの係合爪８は、図２に示すように、他方の環状体６ｂに突き合わせる合わせ面１０から軸方向に突出して設けられており、環状体６ｂの係合孔９に挿入されるようになっている。その係合爪８の先端には鈎部１１が形成されており、その鈎部１１が、環状体６ｂの係合孔９の内面に形成された段部１２に係合する。環状体６ｂの係合爪８も同様に形成されており、環状体６ａの係合孔９に挿入された係合爪８の鈎部１１がその係合孔９内の段部１２に係合する。   As shown in FIG. 2, the engaging claw 8 of the annular body 6a is provided so as to protrude in the axial direction from the mating surface 10 that abuts the other annular body 6b, and is inserted into the engaging hole 9 of the annular body 6b. It has become so. A flange portion 11 is formed at the tip of the engagement claw 8, and the flange portion 11 engages with a step portion 12 formed on the inner surface of the engagement hole 9 of the annular body 6b. The engaging claw 8 of the annular body 6b is formed in the same manner, and the flange portion 11 of the engaging claw 8 inserted into the engaging hole 9 of the annular body 6a engages with the step portion 12 in the engaging hole 9. To do.

ポケット７の両端には、図４に示すように、グリース溜りをなす凹部１３が形成されており、この凹部１３に保持されたグリースがボール３とポケット７の内面とを潤滑する。   As shown in FIG. 4, a recess 13 that forms a grease reservoir is formed at both ends of the pocket 7. The grease held in the recess 13 lubricates the ball 3 and the inner surface of the pocket 7.

凹部１３は、図５に示すように環状体の内周から外周に至らせて形成されており、図６に示すように環状体６ａの凹部１３と他方の環状体６ｂの凹部１３との合わせ目１４にボール３が接触するように形成されている。そのため、ボール３が環状体６ａ、６ｂに接触しても軸方向の分力が生じず、環状体６ａ、６ｂを離反させる力が係合爪に作用しない。   The recess 13 is formed so as to extend from the inner periphery to the outer periphery of the annular body as shown in FIG. 5, and as shown in FIG. 6, the recess 13 of the annular body 6a and the recess 13 of the other annular body 6b are aligned. The balls 3 are formed so as to contact the eyes 14. Therefore, even if the ball 3 comes into contact with the annular bodies 6a and 6b, no axial component force is generated, and the force for separating the annular bodies 6a and 6b does not act on the engaging claws.

この環状体６ａ、６ｂは合成樹脂の成形品からなる。合成樹脂としてはポリアミド（ＰＡ）やポリフェニレンサルファイド（ＰＰＳ）等のエンジニアリングプラスチック単体材料、あるいは更にガラス繊維、炭素繊維などの短繊維を混入して強化した複合材料を用いることができる。   The annular bodies 6a and 6b are formed of a synthetic resin molded product. As the synthetic resin, a single material of engineering plastic such as polyamide (PA) or polyphenylene sulfide (PPS) or a composite material reinforced by mixing short fibers such as glass fiber and carbon fiber can be used.

この玉軸受は、たとえば次のようにして組み立てることができる。まず、内輪１と外輪２との間にボール３を組み込み、そのボール３を周方向に等間隔となるように位置調整する。つぎに、ボール３にポケット７を対応させて環状体６ａ、６ｂを対向配置する。つづいて、環状体６ａ、６ｂを互いに近づけて、環状体６ａの係合爪８を環状体６ｂの係合孔９に、環状体６ｂの係合爪８を環状体６ａの係合孔９に、それぞれ挿入する。さらに環状体６ａ、６ｂを互いに近づけて、合わせ面１０が互いに接触する位置まで係合爪８を係合孔９に挿入すると、係合爪８の鈎部１１が係合孔９内の段部１２に係合して環状体６ａ、６ｂが互いに結合する。   This ball bearing can be assembled as follows, for example. First, the ball 3 is assembled between the inner ring 1 and the outer ring 2, and the positions of the balls 3 are adjusted so as to be equally spaced in the circumferential direction. Next, the annular bodies 6a and 6b are arranged to face each other with the pocket 7 corresponding to the ball 3. Subsequently, the annular bodies 6a and 6b are brought close to each other, the engaging claws 8 of the annular body 6a are brought into the engaging holes 9 of the annular body 6b, and the engaging claws 8 of the annular body 6b are brought into the engaging holes 9 of the annular body 6a. , Insert each. Further, when the annular claws 6 a and 6 b are brought close to each other and the engaging claw 8 is inserted into the engaging hole 9 until the mating surface 10 comes into contact with each other, the flange portion 11 of the engaging claw 8 is stepped in the engaging hole 9. 12 and the annular bodies 6a and 6b are coupled to each other.

このように、保持器４は、２枚の環状体６ａ、６ｂを対向配置して軸方向に押し込む簡単な動作によって組み立てることができる。   As described above, the cage 4 can be assembled by a simple operation in which the two annular bodies 6a and 6b are arranged to face each other and pushed in the axial direction.

この玉軸受は、凹部１３に保持されるグリースでボール３とポケット７の内面とが潤滑されるので、高速回転域においてもボール３とポケット７の内面との摩擦音、摩擦熱を生じにくい。また、ポケット７の内面が摩耗しにくいので、ポケット７の内面の摩耗粉によるグリースの劣化が生じにくい。また、ポケット７の内面が摩耗しにくいので、ボール３とポケット７の内面との隙間が大きくなりにくく、ボール３とポケット７の内面との衝突音が増加しにくい。さらに、ボール３が環状体６ａ、６ｂに接触しても、環状体６ａ、６ｂを離反させる力が係合爪８に作用しないので、係合爪８の鈎部１１が摩耗しにくく、環状体６ａ、６ｂの間にガタが生じにくい。   In this ball bearing, the ball 3 and the inner surface of the pocket 7 are lubricated by the grease held in the recess 13, so that frictional noise and frictional heat between the ball 3 and the inner surface of the pocket 7 are not easily generated even in the high-speed rotation range. Further, since the inner surface of the pocket 7 is not easily worn, the deterioration of the grease due to the wear powder on the inner surface of the pocket 7 is difficult to occur. Further, since the inner surface of the pocket 7 is not easily worn, the gap between the ball 3 and the inner surface of the pocket 7 is difficult to increase, and the collision sound between the ball 3 and the inner surface of the pocket 7 is difficult to increase. Furthermore, even if the ball 3 contacts the annular bodies 6a and 6b, the force for separating the annular bodies 6a and 6b does not act on the engaging claws 8, so that the flange 11 of the engaging claws 8 is not easily worn, and the annular body The backlash is unlikely to occur between 6a and 6b.

係合孔９は、図２に示すように係合爪８に隣接して配置すると好ましい。隣接して配置すると、係合爪８のアンダカット部１５から係合孔９を通じて成形金型を抜くことができるので、環状体６ａ、６ｂの成形が容易である。   The engagement hole 9 is preferably arranged adjacent to the engagement claw 8 as shown in FIG. If it arrange | positions adjacent, since a shaping | molding metal mold | die can be extracted from the undercut part 15 of the engagement nail | claw 8 through the engagement hole 9, shaping | molding of the cyclic | annular bodies 6a and 6b is easy.

また、環状体６ａ、６ｂは、図に示すように互いに同一形状とすれば、１種類の成形金型で保持器４を生産することができるので、生産コストの面で有利になる。   Further, if the annular bodies 6a and 6b have the same shape as shown in the figure, the cage 4 can be produced with one type of molding die, which is advantageous in terms of production cost.

図では、係合爪８の鈎部１１が係合孔９内の段部１２に係合するようにしたが、たとえば係合爪８の鈎部１１が係合孔９を通り抜けてその係合孔９の縁に係合するようにしてもよい。要は、係合孔９に挿入した係合爪８が係合して環状体６ａ、６ｂを結合すればよい。   In the figure, the flange portion 11 of the engagement claw 8 is engaged with the step portion 12 in the engagement hole 9. However, for example, the flange portion 11 of the engagement claw 8 passes through the engagement hole 9 and is engaged. You may make it engage with the edge of the hole 9. In short, the engaging claws 8 inserted into the engaging holes 9 may be engaged to couple the annular bodies 6a and 6b.

図では、係合爪８を環状体６ａ、６ｂの両方に形成し、係合孔９も環状体６ａ、６ｂの両方に形成したが、たとえば係合爪８を環状体６ａにのみ形成し、係合孔９を環状体６ｂにのみ形成してもよい。   In the figure, the engaging claw 8 is formed on both the annular bodies 6a and 6b, and the engaging hole 9 is also formed on both the annular bodies 6a and 6b. For example, the engaging claw 8 is formed only on the annular body 6a, The engagement hole 9 may be formed only in the annular body 6b.

次に、第２実施形態の玉軸受を説明する。図７に、この実施形態の玉軸受の保持器２０を示す。保持器２０は、第１実施形態と同様、軸方向に向き合う２枚の環状体２１ａ、２１ｂからなり、その対向面にはボールを収容する半球状のポケット２２が周方向に等間隔に形成されている。また、隣り合うポケット２２、２２の間には、軸方向に突出する係合爪２３と、他方の環状体の係合爪２３を挿入する係合孔２４とが形成されている。   Next, the ball bearing of the second embodiment will be described. FIG. 7 shows a ball bearing cage 20 of this embodiment. Similar to the first embodiment, the retainer 20 includes two annular bodies 21a and 21b facing in the axial direction, and hemispherical pockets 22 for accommodating the balls are formed at equal intervals in the circumferential direction on the opposing surfaces. ing. Further, between the adjacent pockets 22, 22, an engagement claw 23 protruding in the axial direction and an engagement hole 24 for inserting the engagement claw 23 of the other annular body are formed.

ポケット２２の両端には、グリース溜りをなす凹部２５が環状体の内周側に片寄った位置と外周側に片寄った位置にそれぞれ形成されている。この凹部２５は、環状体２１ａのポケット２２の内面と、他方の環状体２１ｂのポケット２２の内面とが互いに突き合わさり、その合わせ目２６にボールが接触するように形成されている。そのため、ボールが環状体２１ａ、２１ｂに接触しても軸方向の分力が生じず、環状体２１ａ、２１ｂを離反させる力が係合爪２３に作用しない。   At both ends of the pocket 22, recesses 25 forming a grease reservoir are formed at a position offset toward the inner peripheral side of the annular body and at a position offset toward the outer peripheral side, respectively. The recess 25 is formed such that the inner surface of the pocket 22 of the annular body 21a and the inner surface of the pocket 22 of the other annular body 21b abut each other and the ball contacts the joint 26. Therefore, even if the ball contacts the annular bodies 21a and 21b, no axial component force is generated, and the force for separating the annular bodies 21a and 21b does not act on the engaging claws 23.

この玉軸受を用いれば、第１実施形態と同様の効果を得ることができる。すなわち、凹部２５に保持されるグリースでボールとポケット２２の内面とが潤滑されるので、高速回転域においてもボールとポケット２２の内面との摩擦音、摩擦熱を生じにくく、ポケット２２の内面の摩耗粉によるグリースの劣化が生じにくい。また、ボールとポケット２２の内面との衝突音が増加しにくい。さらに、ボールが環状体２１ａ、２１ｂに接触しても、環状体２１ａ、２１ｂを離反させる力が係合爪２３に作用しないので、係合爪２３が摩耗しにくく、環状体２１ａ、２１ｂの間にガタが生じにくい。   If this ball bearing is used, the same effect as the first embodiment can be obtained. That is, since the ball and the inner surface of the pocket 22 are lubricated by the grease held in the concave portion 25, frictional sound and frictional heat between the ball and the inner surface of the pocket 22 are hardly generated even in a high-speed rotation range, and the inner surface of the pocket 22 is worn. Grease deterioration due to powder is unlikely to occur. Further, it is difficult for the collision noise between the ball and the inner surface of the pocket 22 to increase. Furthermore, even if the ball contacts the annular bodies 21a and 21b, the force that separates the annular bodies 21a and 21b does not act on the engaging claws 23. The backlash is less likely to occur.

凹部２５は、環状体の内周側に片寄った位置にのみ形成してもよい。また、ポケット２２の一端は内周側に片寄った位置にのみ、ポケット２２の他端は外周側に片寄った位置にのみ、それぞれ形成してもよい。要は、環状体の内周側に片寄った位置と外周側に片寄った位置の一方または両方に凹部２５を形成し、ポケット２２の内面の合わせ目にボールが接触すればよい。   The concave portion 25 may be formed only at a position offset toward the inner peripheral side of the annular body. Further, one end of the pocket 22 may be formed only at a position offset toward the inner peripheral side, and the other end of the pocket 22 may be formed only at a position offset toward the outer peripheral side. In short, the concave portion 25 may be formed at one or both of the position offset toward the inner peripheral side and the position offset toward the outer peripheral side of the annular body, and the ball may contact the joint of the inner surface of the pocket 22.

次に、第３実施形態の玉軸受を説明する。図８に、この実施形態の玉軸受の保持器３０を示す。保持器３０は、第１実施形態と同様、軸方向に向き合う２枚の環状体３１ａ、３１ｂからなり、その対向面にはボールを収容する半球状のポケット３２が周方向に等間隔に形成されている。また、隣り合うポケット３２、３２の間には、軸方向に突出する係合爪３３と、他方の環状体の係合爪３３を挿入する係合孔３４とが形成されている。   Next, the ball bearing of 3rd Embodiment is demonstrated. FIG. 8 shows a ball bearing cage 30 of this embodiment. As in the first embodiment, the retainer 30 is composed of two annular bodies 31a and 31b facing each other in the axial direction, and hemispherical pockets 32 for accommodating the balls are formed at equal intervals in the circumferential direction on the opposing surfaces. ing. Further, between the adjacent pockets 32, 32, an engaging claw 33 protruding in the axial direction and an engaging hole 34 for inserting the engaging claw 33 of the other annular body are formed.

ポケット３２の両端には、グリース溜りをなす凹部３５が環状体の内周と外周の中間位置に形成されている。この凹部３５は、環状体３１ａの凹部３５の縁と、他方の環状体３１ｂの凹部３５の縁が互いに突き合わさり、その合わせ目３６にボールが接触するように形成されている。そのため、ボールが環状体３１ａ、３１ｂに接触しても軸方向の分力が生じず、環状体３１ａ、３１ｂを離反させる力が係合爪３３に作用しない。   At both ends of the pocket 32, recesses 35 forming a grease reservoir are formed at intermediate positions between the inner periphery and the outer periphery of the annular body. The recess 35 is formed such that the edge of the recess 35 of the annular body 31a and the edge of the recess 35 of the other annular body 31b abut each other and the ball contacts the seam 36. Therefore, even if the ball contacts the annular bodies 31 a and 31 b, no axial component force is generated, and the force for separating the annular bodies 31 a and 31 b does not act on the engaging claws 33.

この玉軸受も第１実施形態の軸受と同様の効果を得る。   This ball bearing also obtains the same effect as the bearing of the first embodiment.

この発明の第１実施形態の玉軸受を示す断面図Sectional drawing which shows the ball bearing of 1st Embodiment of this invention 同上の玉軸受の保持器の一部を示す分解斜視図The exploded perspective view which shows a part of cage of a ball bearing same as the above 同上の保持器の環状体を示す平面図The top view which shows the annular body of a cage same as the above 同上の保持器の一部を示す断面図Sectional drawing which shows a part of cage same as the above 同上の玉軸受の保持器の一部を示す斜視図The perspective view which shows a part of retainer of a ball bearing same as the above 同上の保持器にボールが接触した状態を示す断面図Sectional drawing which shows the state which the ball contacted the cage same as the above この発明の第２実施形態の玉軸受の保持器を示す斜視図The perspective view which shows the holder | retainer of the ball bearing of 2nd Embodiment of this invention. この発明の第３実施形態の玉軸受の保持器を示す斜視図The perspective view which shows the holder | retainer of the ball bearing of 3rd Embodiment of this invention. 従来の玉軸受の保持器にボールが接触した状態を示す断面図Sectional drawing which shows the state which the ball contacted the cage | basket of the conventional ball bearing

符号の説明Explanation of symbols

１ 内輪
２ 外輪
３ ボール
４ 保持器
６ａ、６ｂ 環状体
７ ポケット
８ 係合爪
９ 係合孔
１３ 凹部
１４ 合わせ目
２０ 保持器
２１ａ、２１ｂ 環状体
２２ ポケット
２３ 係合爪
２４ 係合孔
２５ 凹部
２６ 合わせ目
３０ 保持器
３１ａ、３１ｂ 環状体
３２ ポケット
３３ 係合爪
３４ 係合孔
３５ 凹部
３６ 合わせ目 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Cage 6a, 6b Annular body 7 Pocket 8 Engagement claw 9 Engagement hole 13 Recess 14 Seam 20 Retainer 21a, 21b Annulus 22 Pocket 23 Engagement claw 24 Engagement hole 25 Recess 26 Seam 30 Cage 31a, 31b Annular body 32 Pocket 33 Engagement claw 34 Engagement hole 35 Recess 36 Seam

Claims (4)

軸方向に向き合う２枚の環状体の対向面にボールを収容する半球状のポケットを周方向に等間隔に形成し、軸方向に突出する係合爪を一方の前記環状体の隣り合うポケット間に設け、その係合爪を挿入する係合孔を他方の前記環状体の隣り合うポケット間に形成し、前記係合孔に挿入した前記係合爪を前記他方の環状体に係合させて前記２枚の環状体を結合する合成樹脂製保持器を有し、その合成樹脂製保持器で内輪と外輪の間のボールを保持し、前記ポケットの両端での各環状体の合わせ目が合成樹脂製保持器の軸方向中央に位置する玉軸受において、
グリース溜りをなす凹部を前記各環状体の前記ポケットの両端に球状のポケット内面から凹ませて形成し、前記各環状体の合わせ目に前記ボールが接触することを特徴とする玉軸受。 Hemispherical pockets for accommodating the balls are formed at equal intervals in the circumferential direction on the opposing surfaces of the two annular members facing in the axial direction, and the engaging claws protruding in the axial direction are formed between adjacent pockets of one annular member. An engaging hole for inserting the engaging claw is formed between adjacent pockets of the other annular body, and the engaging claw inserted into the engaging hole is engaged with the other annular body. It has a synthetic resin cage that joins the two annular bodies, and the synthetic resin cage holds the ball between the inner ring and the outer ring, and the joints of the annular bodies at both ends of the pocket are synthesized. In the ball bearing located in the axial center of the resin cage ,
A ball bearing characterized in that a concave portion forming a grease reservoir is formed by denting both ends of the pocket of each annular body from the inner surface of the spherical pocket, and the ball contacts the joint of each annular body. 前記凹部を前記環状体の内周から外周に至らせて形成し、一方の前記環状体の前記凹部と他方の前記環状体の前記凹部の合わせ目に前記ボールが接触する請求項１に記載の玉軸受。   The said recessed part is formed from the inner periphery of the said annular body to an outer periphery, and the said ball contacts the joint of the said recessed part of one said annular body, and the said recessed part of the other said annular body. Ball bearing. 前記凹部を内周側に片寄った位置と外周側に片寄った位置の一方または両方に形成し、一方の前記環状体のポケット面と他方の前記環状体のポケット面の合わせ目に前記ボールが接触する請求項１に記載の玉軸受。   The concave portion is formed at one or both of a position offset toward the inner peripheral side and a position offset toward the outer peripheral side, and the ball contacts the joint between the pocket surface of one annular body and the pocket surface of the other annular body. The ball bearing according to claim 1. 前記凹部を内周と外周の中間位置に形成し、一方の前記環状体の前記凹部の縁と他方の前記環状体の前記凹部の縁の合わせ目に前記ボールが接触する請求項１に記載の玉軸受。   The said recessed part is formed in the intermediate position of an inner periphery and an outer periphery, and the said ball contacts the joint of the edge of the said recessed part of one said annular body, and the edge of the said recessed part of the said other annular body. Ball bearing.
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