JP4601451B2 - Synthetic resin cage and ball bearing - Google Patents

Synthetic resin cage and ball bearing Download PDF

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JP4601451B2
JP4601451B2 JP2005042343A JP2005042343A JP4601451B2 JP 4601451 B2 JP4601451 B2 JP 4601451B2 JP 2005042343 A JP2005042343 A JP 2005042343A JP 2005042343 A JP2005042343 A JP 2005042343A JP 4601451 B2 JP4601451 B2 JP 4601451B2
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cage
ball
ball bearing
synthetic resin
annular
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JP2006226447A (en
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直明 辻
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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
    • F16C33/66—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

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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、合成樹脂製の保持器およびその保持器を用いた玉軸受に関する。   The present invention relates to a cage made of synthetic resin and a ball bearing using the cage.

合成樹脂製保持器として、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形成されている。   As a synthetic resin cage, one described in Patent Document 1 below is known. This cage is composed of two annular bodies facing each other in the axial direction, and hemispherical pockets for receiving balls are formed at equal intervals in the circumferential direction on the opposing surface of each annular body. An engaging claw protruding in the direction and an engaging hole for engaging the engaging claw are formed.

しかし、この保持器は、ポケット面にグリース溜りが設置されていないので、ボールに付着したグリースをポケットの縁でかきとってしまう。そのため、ボールと内外輪との潤滑状態が悪くなることがあった。   However, this cage does not have a grease reservoir on the pocket surface, so the grease adhering to the ball is scraped off at the edge of the pocket. Therefore, the lubrication state between the ball and the inner and outer rings may be deteriorated.

また、ｄｎ値（軸受内径と回転数の積）が３５万を超える高速回転域になると、ポケット面が急速に摩耗して摩耗粉を生じ、その摩耗粉がグリースの劣化を早めるという問題があった。また、ポケット面にボールが強く接触して摩擦熱が生じ、その摩擦熱により軸受の温度が急激に上昇するという問題もあった。   Further, when the dn value (product of the bearing inner diameter and the rotational speed) exceeds 350,000, there is a problem that the pocket surface rapidly wears to generate wear powder, which accelerates the deterioration of the grease. It was. In addition, there is a problem that the ball comes into strong contact with the pocket surface to generate frictional heat, and the frictional heat rapidly increases the temperature of the bearing.

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耗粉や摩擦熱を生じにくく、しかも組み立てが簡単な合成樹脂製保持器を提供することである。   The problem to be solved by the present invention is to provide a synthetic resin cage that is difficult to generate wear powder and frictional heat due to contact with a ball even in a high-speed rotation range and that is easy to assemble.

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前記各環状体の隣り合うポケット間に設け、その係合爪を係合させる係合孔を前記各環状体の隣り合うポケット間に形成した合成樹脂製保持器において、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 A synthetic resin retainer provided between adjacent pockets of each annular body and having an engagement hole for engaging the engaging claw between adjacent pockets of each of the annular bodies. It was formed at both ends of the pocket of the annular body.

この合成樹脂製保持器は、たとえば内輪と外輪との間のボールを保持器で保持する玉軸受に組み込むことができ、この発明ではその玉軸受も併せて提供する。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）前記凹部の軸方向の幅を、ボール径に対して２０％以下とする。
２）前記凹部の周方向の深さを、ボール径に対して５〜１０％とする。 This synthetic resin cage can be incorporated into, for example, a ball bearing that holds the ball between the inner ring and the outer ring with the cage, and the present invention also provides the ball bearing. This ball bearing becomes more preferable when the following configuration is added.
1) The axial width of the recess is 20% or less with respect to the ball diameter.
2) The depth of the concave portion in the circumferential direction is set to 5 to 10% with respect to the ball diameter.

凹部に保持される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耗粉や摩擦熱の発生を抑制する。また、２枚の環状体を対向配置して軸方向に押し込むと、係合爪が係合孔に係合して２枚の環状体が結合するので、保持器の組み立てが簡単である。   The grease held in the recesses lubricates the ball and pocket surfaces, and suppresses the generation of wear powder and frictional heat in the high-speed rotation range. Further, when the two annular bodies are arranged opposite to each other and pushed in the axial direction, the engaging claws engage with the engaging holes and the two annular bodies are coupled, so that the assembly of the cage is simple.

図１に、この発明の実施形態を示す。この深溝玉軸受は、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。   FIG. 1 shows an embodiment of the present invention. The deep groove 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.

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５ａ、５ｂからなる。環状体５ａ、５ｂの対向面には半球状のポケット６が形成されており、このポケット６にボール３が収容される。ポケット６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６、６の間には、係合爪７と係合孔８が形成されている。   As shown in FIG. 2, the cage 4 includes two annular bodies 5a and 5b facing in the axial direction. A hemispherical pocket 6 is formed on the opposing surfaces of the annular bodies 5a and 5b, and the ball 3 is accommodated in the pocket 6. As shown in FIG. 3, the pockets 6 are formed at equal intervals in the circumferential direction, and an engaging claw 7 and an engaging hole 8 are formed between the adjacent pockets 6, 6.

環状体５ａの係合爪７は、図２に示すように、他方の環状体５ｂに突き合わせる合わせ面９から軸方向に突出して設けられており、環状体５ｂの係合孔８に挿入されるようになっている。この係合爪７の先端には鈎部１０が形成されており、その鈎部１０が、環状体５ｂの係合孔８の内面に形成された段部１１に係合する。環状体５ｂの係合爪７も同様に形成されており、環状体５ａの係合孔８に挿入された係合爪７の鈎部１０がその係合孔８内の段部１１に係合する。   As shown in FIG. 2, the engaging claw 7 of the annular body 5a is provided so as to protrude in the axial direction from the mating surface 9 that abuts the other annular body 5b, and is inserted into the engaging hole 8 of the annular body 5b. It has become so. A flange portion 10 is formed at the tip of the engagement claw 7, and the flange portion 10 engages with a step portion 11 formed on the inner surface of the engagement hole 8 of the annular body 5b. The engagement claw 7 of the annular body 5b is formed in the same manner, and the flange portion 10 of the engagement claw 7 inserted into the engagement hole 8 of the annular body 5a is engaged with the step portion 11 in the engagement hole 8. To do.

ポケット６の両端には断面Ｌ字状の凹部１２が形成されており、その凹部１２が図４に示すようにグリース溜りをなす。凹部１２に保持されたグリースは、ボール３とポケット６の内面とを潤滑して、ボール３と保持器４の接触による摩耗粉や摩擦熱の発生を抑制する。   Concave portions 12 having an L-shaped cross section are formed at both ends of the pocket 6, and the concave portions 12 form a grease reservoir as shown in FIG. The grease held in the recess 12 lubricates the ball 3 and the inner surface of the pocket 6 to suppress generation of wear powder and frictional heat due to contact between the ball 3 and the cage 4.

この環状体５ａ、５ｂは合成樹脂の成形品からなる。合成樹脂としては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を用いることができる。   The annular bodies 5a and 5b are formed of a synthetic resin molded product. As the synthetic resin, an engineering plastic such as polyphenylene sulfide (PPS) can be used.

この深溝玉軸受は、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６を対応させて環状体５ａ、５ｂを対向配置する。つづいて、環状体５ａ、５ｂを互いに近づけて、環状体５ａの係合爪７を環状体５ｂの係合孔８に、環状体５ｂの係合爪７を環状体５ａの係合孔８に、それぞれ挿入する。さらに環状体５ａ、５ｂを互いに近づけて、合わせ面９が互いに接触する位置まで係合爪７を係合孔８に挿入すると、係合爪７の鈎部１０が係合孔８内の段部１１に係合して環状体５ａ、５ｂが互いに結合する。   This deep groove ball bearing can be assembled, for example, as follows. 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 5a and 5b are arranged to face each other with the pocket 6 corresponding to the ball 3. Subsequently, the annular bodies 5a and 5b are brought close to each other, the engaging claw 7 of the annular body 5a is brought into the engaging hole 8 of the annular body 5b, and the engaging claw 7 of the annular body 5b is brought into the engaging hole 8 of the annular body 5a. , Insert each. Further, when the annular claws 5a and 5b are brought close to each other and the engaging claw 7 is inserted into the engaging hole 8 until the mating surfaces 9 come into contact with each other, the flange portion 10 of the engaging claw 7 is stepped in the engaging hole 8. 11 and the annular bodies 5a and 5b are coupled to each other.

このように、保持器４は、２枚の環状体５ａ、５ｂ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。また、この保持器４を用いれば、凹部１２に保持されるグリースでボール３とポケット６の内面とが潤滑されるので、高速回転域においても摩耗粉が生じにくく、グリースが劣化しにくい。また高速回転域においても摩擦熱を生じにくく、温度上昇が少ない。   As described above, the cage 4 can be assembled by a simple operation in which the two annular bodies 5a and 5b are arranged to face each other and pushed in the axial direction. Further, if this cage 4 is used, the grease retained in the recess 12 lubricates the balls 3 and the inner surfaces of the pockets 6, so that abrasion powder is hardly generated even in a high-speed rotation range, and the grease is not easily deteriorated. In addition, frictional heat hardly occurs even in a high-speed rotation region, and the temperature rise is small.

係合孔８は、図に示すように係合爪７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７のアンダカット部１３から係合孔８を通じて成形金型を抜くことができるので、環状体５ａ、５ｂの成形が容易である。   The engagement hole 8 is preferably disposed adjacent to the engagement claw 7 as shown in the figure. If it arrange | positions adjacent, since a shaping | molding metal mold | die can be extracted from the undercut part 13 of the engagement nail | claw 7 through the engagement hole 8, formation of the annular bodies 5a and 5b is easy.

また、環状体５ａ、５ｂ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 5a and 5b 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５に示す凹部１２の軸方向の幅Ａは、ボール３の直径に対して２０％以下に設定すると好ましい。２０％以下とすると、凹部１２にボール３が侵入しにくくなり、凹部３内でのグリースの流動を良好に保つことができる。   The axial width A of the recess 12 shown in FIG. 5 is preferably set to 20% or less with respect to the diameter of the ball 3. If it is 20% or less, the balls 3 are less likely to enter the recesses 12, and the grease flow in the recesses 3 can be kept good.

また、図５に示す凹部１２の周方向の深さＢは、ボール３の直径に対して５〜１０％に設定すると好ましい。深さＢを５％以上とすると、凹部１２内でグリースが円滑に流動するので、ボール３とポケット６の内面とをより良好に潤滑することができる。また、深さＢを１０％以下とすると、凹部１２を形成することによる環状体５ａ、５ｂの剛性低下を小さく抑えることができる。   5 is preferably set to 5 to 10% with respect to the diameter of the ball 3. When the depth B is 5% or more, the grease flows smoothly in the recess 12, so that the balls 3 and the inner surfaces of the pockets 6 can be lubricated better. Moreover, if the depth B is 10% or less, the rigidity reduction of the annular bodies 5a and 5b due to the formation of the recesses 12 can be suppressed to a small level.

図３に示す係合爪７の径方向の幅Ｃは、環状体５ａ（５ｂ）の径方向の幅Ｄに対して５５〜６５％に設定すると好ましい。幅Ｃを５５％以上とすると、係合爪７の剛性が高くなるので係合爪７と係合孔８の係合がはずれにくくなり、環状体５ａ、５ｂの結合がより安定する。また幅Ｃを６５％以下とすると、係合爪７を挿入する係合孔８の幅も小さくなるので、係合孔８を形成することによる環状体５ａ、５ｂの剛性低下を小さく抑えることができる。   The radial width C of the engaging claw 7 shown in FIG. 3 is preferably set to 55 to 65% with respect to the radial width D of the annular body 5a (5b). When the width C is 55% or more, the rigidity of the engagement claw 7 is increased, so that the engagement between the engagement claw 7 and the engagement hole 8 is difficult to disengage, and the coupling of the annular bodies 5a and 5b is more stable. If the width C is 65% or less, the width of the engagement hole 8 into which the engagement claw 7 is inserted is also reduced, so that the reduction in rigidity of the annular bodies 5a and 5b due to the formation of the engagement hole 8 can be kept small. it can.

また、図５に示す係合爪７の周方向の厚みＥを、合わせ面９の周方向の長さＦに対して４５〜５５％に設定すると好ましい。周方向の厚みＥを４５％以上とすると、係合爪７の剛性が高くなるので係合爪７と係合孔８の係合がはずれにくくなり、環状体５ａ、５ｂの結合がより安定する。また、周方向の厚みＥを５５％以下とすると、係合爪７を挿入する係合孔８の周方向の長さも小さくなるので、係合孔８を形成することによる環状体５ａ、５ｂの剛性低下を小さく抑えることができる。   5 is preferably set to 45 to 55% with respect to the circumferential length F of the mating surface 9. If the thickness E in the circumferential direction is 45% or more, the rigidity of the engagement claw 7 is increased, so that the engagement between the engagement claw 7 and the engagement hole 8 is difficult to disengage, and the coupling of the annular bodies 5a and 5b is more stable. . Further, if the circumferential thickness E is 55% or less, the circumferential length of the engagement hole 8 into which the engagement claw 7 is inserted is also reduced, so that the annular bodies 5a and 5b formed by forming the engagement hole 8 are reduced. It is possible to suppress a decrease in rigidity.

また、上述の合成樹脂製保持器４をグリース密封形の深溝玉軸受に組み込むときは、環状体の合わせ面９の位置の軸方向厚みＧを、ボール３の直径に対して５０〜６５％に設定すると好ましい。軸方向厚みＧを６５％以下とすると、軸受へのグリース注入量を確保することができ、また５０％以上にすると、環状体５ａ、５ｂの剛性を確保できる。   When the above-mentioned synthetic resin cage 4 is incorporated into a grease-sealed deep groove ball bearing, the axial thickness G at the position of the mating surface 9 of the annular body is set to 50 to 65% with respect to the diameter of the ball 3. It is preferable to set. If the axial thickness G is 65% or less, the amount of grease injected into the bearing can be secured, and if it is 50% or more, the rigidity of the annular bodies 5a and 5b can be secured.

上記実施形態では、玉軸受として深溝玉軸受を例に挙げて説明したが、たとえばアンギュラ玉軸受等の他の形式の玉軸受にも適用することができる。   In the above embodiment, a deep groove ball bearing has been described as an example of the ball bearing, but the present invention can also be applied to other types of ball bearings such as an angular ball bearing.

この発明の深溝玉軸受の実施形態を示す断面図Sectional drawing which shows embodiment of the deep groove ball bearing of this invention 同上の深溝玉軸受の保持器の一部を示す拡大斜視図The expanded perspective view which shows a part of cage of the deep groove 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拡大断面図Expanded sectional view showing a part of the cage 同上の保持器の一部を示す拡大断面図Expanded sectional view showing a part of the cage

符号の説明Explanation of symbols

１ 内輪
２ 外輪
３ ボール
４ 保持器
５ａ、５ｂ 環状体
６ ポケット
７ 係合爪
８ 係合孔
１２ 凹部 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Cage 5a, 5b Annulus 6 Pocket 7 Engagement claw 8 Engagement hole 12 Recess

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前記各環状体の隣り合うポケット間に設け、その係合爪を係合させる係合孔を前記各環状体の隣り合うポケット間に形成した合成樹脂製保持器において、
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、前記ポケットの両端での各環状体の合わせ目が前記凹部内にあり、前記係合爪の径方向の幅を環状体の径方向の幅に対して５５〜６５％に設定したことを特徴とする合成樹脂製保持器。 Hemispherical pockets for accommodating the balls are formed at equal intervals in the circumferential direction on opposite surfaces of the two annular members facing in the axial direction, and engaging claws protruding in the axial direction are formed between adjacent pockets of the annular members. In a synthetic resin cage in which an engagement hole for engaging the engagement claw is formed between adjacent pockets of each annular body,
Recesses forming a grease reservoir are formed at both ends of the pockets of the annular bodies, the joints of the annular bodies at both ends of the pockets are in the recesses, and the radial width of the engaging claws is set in the annular body. A synthetic resin cage characterized by being set to 55 to 65% of the width in the radial direction. 内輪と外輪との間のボールを保持器で保持する玉軸受において、前記保持器として請求項１に記載の合成樹脂製保持器を用いた玉軸受。   A ball bearing for holding a ball between an inner ring and an outer ring by a cage, wherein the cage is the ball bearing using the synthetic resin cage according to claim 1. 前記凹部の軸方向の幅を、ボール径に対して２０％以下とした請求項２に記載の玉軸受。   The ball bearing according to claim 2, wherein the recess has an axial width of 20% or less with respect to the ball diameter. 前記凹部の周方向の深さを、ボール径に対して５〜１０％とした請求項２に記載の玉軸受。   The ball bearing according to claim 2, wherein the depth of the concave portion in the circumferential direction is 5 to 10% with respect to the ball diameter.
JP2005042343A 2004-09-27 2005-02-18 Synthetic resin cage and ball bearing Active JP4601451B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2005042343A JP4601451B2 (en) 2005-02-18 2005-02-18 Synthetic resin cage and ball bearing
DE102005046161A DE102005046161A1 (en) 2004-09-27 2005-09-27 Deep groove ball bearing has plastic cage made up of two rings with semicircular sections spaced around them which fit together to make circular pockets for balls, cage rotating with inner ring of bearing

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Application Number Priority Date Filing Date Title
JP2005042343A JP4601451B2 (en) 2005-02-18 2005-02-18 Synthetic resin cage and ball bearing

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JP2006226447A JP2006226447A (en) 2006-08-31
JP4601451B2 true JP4601451B2 (en) 2010-12-22

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US8727631B2 (en) 2008-06-13 2014-05-20 Ntn Corporation Retainer, deep groove ball bearing, and bearing with seal
JP5602345B2 (en) * 2008-06-13 2014-10-08 Ｎｔｎ株式会社 Cage and deep groove ball bearings
EP2708767B1 (en) 2011-05-13 2018-08-22 NTN Corporation Retainer for ball bearing, and ball bearing
JP2017057876A (en) * 2015-09-14 2017-03-23 株式会社ジェイテクト Rolling bearing
WO2020059829A1 (en) * 2018-09-21 2020-03-26 Ntn株式会社 Ball bearing retainer and rolling bearing
JP2020159548A (en) * 2018-09-21 2020-10-01 Ntn株式会社 Cage for ball bearing and rolling bearing

Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2003343571A (en) * 2002-05-27 2003-12-03 Ntn Corp Holder made of synthetic resin
JP2003343567A (en) * 2002-05-27 2003-12-03 Ntn Corp Deep grooved ball bearing
JP2004076778A (en) * 2002-08-12 2004-03-11 Ntn Corp Synthetic resin cage and deep groove ball bearing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003343571A (en) * 2002-05-27 2003-12-03 Ntn Corp Holder made of synthetic resin
JP2003343567A (en) * 2002-05-27 2003-12-03 Ntn Corp Deep grooved ball bearing
JP2004076778A (en) * 2002-08-12 2004-03-11 Ntn Corp Synthetic resin cage and deep groove ball bearing

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