JP4893282B2 - Bearing unit - Google Patents

Bearing unit Download PDF

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JP4893282B2
JP4893282B2 JP2006330870A JP2006330870A JP4893282B2 JP 4893282 B2 JP4893282 B2 JP 4893282B2 JP 2006330870 A JP2006330870 A JP 2006330870A JP 2006330870 A JP2006330870 A JP 2006330870A JP 4893282 B2 JP4893282 B2 JP 4893282B2
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Japan
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diameter
cage
outer ring
raceway surface
bearing
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JP2008144813A (en
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和孝 山口
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NSK Ltd
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NSK Ltd
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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
    • F16C33/3806—Details of interaction of cage and race, e.g. retention, centring
    • 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
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded comb cages
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F16C43/06—Placing rolling bodies in cages or bearings
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/185—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は軸受ユニットに関し、詳細には、軸受ユニットを組み立てる際に玉が保持器からこぼれることなく容易に組み立てることが可能な軸受ユニットに関する。   The present invention relates to a bearing unit, and more particularly to a bearing unit that can be easily assembled without spilling balls from a cage when the bearing unit is assembled.

従来から、自動車の車輪（例えば、ディスクホイール）を車体（例えば、懸架装置（サスペンション））に対して回転自在に支持するための各種の軸受ユニットでは、例えば図５に示すように、車体側に固定される静止輪（例えば別体内輪）４，４と、別体内輪４，４の外側に対向して設けられ且つ車輪側に接続（固定）されて車輪と共に回転する回転輪（例えば外輪）２と、別体内輪４と外輪２との間に複列（例えば２列）で回転可能に組み込まれ、複列に配された複数の転動体（例えば玉）６と、転動体（玉）６を外内輪２，４間で周方向に所定の間隔で保持する保持器７を備えている。   Conventionally, in various bearing units for rotatably supporting a vehicle wheel (for example, a disc wheel) with respect to a vehicle body (for example, a suspension device (suspension)), for example, as shown in FIG. A stationary wheel (for example, another inner ring) 4 and 4 to be fixed, and a rotating wheel (for example, an outer ring) that is provided facing the outside of the other inner rings 4 and 4 and is connected (fixed) to the wheel side and rotates with the wheel 2, a plurality of rolling elements (for example, balls) 6, which are rotatably incorporated in a double row (for example, two rows) between the separate inner ring 4 and the outer ring 2, and a rolling element (a ball). A cage 7 is provided for holding 6 at a predetermined interval in the circumferential direction between the outer inner rings 2 and 4.

外輪２は、内径側に複列の外輪軌道面２１を備えた略円筒形状に形成され、その外周面の一端から外方に向かって突出して一体成形された円板状のハブフランジ２ａが延出され、ハブフランジ２ａには、車輪側構成品（例えば自動車のディスクホイールやブレーキローター）が固定されて共に回転する。
別体内輪４，４は、外径側に内輪軌道面４１を備えた略円筒形状に形成され、その内径側には、車体側のスピンドル（図示しない）が係合され、これにより、車体に車輪側構成品が回転可能に支持される。 The outer ring 2 is formed in a substantially cylindrical shape having double rows of outer ring raceway surfaces 21 on the inner diameter side, and a disk-shaped hub flange 2a that protrudes outward from one end of the outer peripheral surface and is integrally formed extends. A wheel side component (for example, a disc wheel or brake rotor of an automobile) is fixed to the hub flange 2a and rotates together.
The separate inner rings 4 and 4 are formed in a substantially cylindrical shape having an inner ring raceway surface 41 on the outer diameter side, and a spindle (not shown) on the vehicle body side is engaged with the inner diameter side, thereby The wheel side component is rotatably supported.

また、保持器７は、図６に示すように、前記内輪４と外輪２の間に挿入可能な小径（図中Ｄ１参照）の円環状に形成された基部８と、当該基部８から所定の間隔で軸方向に延出するとともに先端側９ａに向けて徐々に大径（図中Ｄ２参照）となるように形成された柱部９と、その柱部９間に形成され、転動体６を収容可能なポケットＰとで構成されている。さらに、保持器７は、そのポケットＰの内周面が転動体６の転動面の曲率半径よりも僅かに大きな曲率半径に形成されるとともに平面視Ｃ字型に軸方向に開口して形成されることにより、いわゆる冠型保持器７を形成している。また、一般的に、冠型保持器７は樹脂材料によって成形されている。   As shown in FIG. 6, the cage 7 includes a base 8 formed in an annular shape having a small diameter (see D <b> 1 in the drawing) that can be inserted between the inner ring 4 and the outer ring 2, and a predetermined amount from the base 8. A column portion 9 formed so as to extend in the axial direction at intervals and gradually increase in diameter toward the distal end side 9a (see D2 in the figure), and between the column portions 9, It is comprised with the pocket P which can be accommodated. Further, the cage 7 is formed such that the inner peripheral surface of the pocket P has a radius of curvature slightly larger than the radius of curvature of the rolling surface of the rolling element 6 and is opened in the axial direction in a C shape in plan view. As a result, a so-called crown-shaped cage 7 is formed. In general, the crown type cage 7 is formed of a resin material.

ところで、このような複列の軸受ユニットを組み立てる際には、一般的には、予め転動体（玉）６を保持器７のポケットＰに組み込んで玉保持器組立品とし、その玉保持器組立品を外輪２の外輪軌道面２１に挿入してから、最後に別体内輪４を挿入する。
その玉保持器組立品を外輪軌道面２１に挿入する工程において、軸受ユニットの上部においては外輪軌道面２１が下向きに配されていることから、玉保持器組立品を外輪軌道面２１に挿入した後、別体内輪４を挿入するまでの間、外輪軌道面２１から玉保持器組立品が脱落しないように保持することを要する。 By the way, when assembling such a double row bearing unit, in general, the rolling elements (balls) 6 are assembled in advance in the pockets P of the cage 7 to form a ball cage assembly. After the product is inserted into the outer ring raceway surface 21 of the outer ring 2, the other inner ring 4 is finally inserted.
In the step of inserting the ball cage assembly into the outer ring raceway surface 21, the outer ring raceway surface 21 is arranged downward in the upper part of the bearing unit, so that the ball cage assembly is inserted into the outer ring raceway surface 21. Thereafter, until the separate inner ring 4 is inserted, it is necessary to hold the ball cage assembly from the outer ring raceway surface 21 so as not to drop off.

その一般的な方法として、例えば、特許文献１では、外輪２の外輪軌道面２１の軸方向外側の肩部を軸受内部すきまよりも若干小径の内径寸法に設定してカウンターボアを形成し、転動体（玉）６を前記肩部に引っ掛けて保持している。
また、一般的な他の方法として、転動体（玉）６と保持器７のポケットＰとの径の差を利用した方法がある。
この場合には、図７に示すように、外輪２の外輪軌道面２１の軸方向外側には、軸受が組み立てられた場合における転動体（玉）６の外径接線を結んだ仮想円の径（同図中Ｄ３参照）と同径か若干小径（同図中Ｄ４参照）に形成された小径部２２を形成している。また、一般的に、保持器７のポケットＰの径は転動体（玉）６の外径よりも若干大きく形成されており、転動体（玉）６は、ポケットＰ内でラジアル方向（図中両矢印Ｒ参照）の若干の移動が可能となっている。
玉保持器組立品（保持器７と転動体（玉）６の組立品）を外輪軌道面２１に挿入する際には、小径部２２が転動体（玉）６の転動面６ａを軸受軸心方向に押圧することで、転動体（玉）６がポケットＰ内で軸受軸心方向に移動して、前記小径部２２を通過する。これにより、転動体（玉）６が外輪軌道面２１に挿入される。 As a general method, for example, in Patent Document 1, the counter bore is formed by setting the axially outer shoulder of the outer ring raceway surface 21 of the outer ring 2 to an inner diameter dimension slightly smaller than the bearing internal clearance. The moving body (ball) 6 is hooked and held on the shoulder.
Further, as another general method, there is a method using a difference in diameter between the rolling element (ball) 6 and the pocket P of the cage 7.
In this case, as shown in FIG. 7, the diameter of a virtual circle connecting the outer diameter tangent of the rolling element (ball) 6 when the bearing is assembled on the outer side in the axial direction of the outer ring raceway surface 21 of the outer ring 2. A small-diameter portion 22 is formed which has the same diameter as (see D3 in the figure) or slightly smaller diameter (see D4 in the figure). In general, the diameter of the pocket P of the cage 7 is slightly larger than the outer diameter of the rolling element (ball) 6, and the rolling element (ball) 6 is radial in the pocket P (in the drawing). A slight movement of double arrow R) is possible.
When the ball cage assembly (assembly of the cage 7 and the rolling element (ball) 6) is inserted into the outer ring raceway surface 21, the small diameter portion 22 causes the rolling surface 6a of the rolling element (ball) 6 to act as a bearing shaft. By pressing in the center direction, the rolling elements (balls) 6 move in the bearing shaft center direction in the pocket P and pass through the small diameter portion 22. As a result, the rolling elements (balls) 6 are inserted into the outer ring raceway surface 21.

このように前記玉保持器組立品が外輪軌道面２１に挿入された後にはポケットＰ内の転動体（玉）６が中立位置に戻る。このとき、転動体（玉）６の転動面６ａが小径部２２に引っ掛かり、玉保持器組立品が外輪軌道面２１から脱落し難くなっている。   After the ball cage assembly is thus inserted into the outer ring raceway surface 21, the rolling elements (balls) 6 in the pocket P return to the neutral position. At this time, the rolling surface 6 a of the rolling element (ball) 6 is caught by the small diameter portion 22, and the ball cage assembly is difficult to drop off from the outer ring raceway surface 21.

しかし、この方法では、玉保持器組立品を外輪軌道面２１に挿入する工程において、外輪２の軸心と玉保持器組立品（保持器７と転動体（玉）６の組立品）の軸心が同心度を保って整合していることが好ましい。もし、双方の軸心にズレが生じた場合には、そのズレの程度によっては転動体（玉）６と外輪２の小径部とが衝突し摩擦が生じる虞があった。さらに、摩擦の程度によっては転動体（玉）６の転動面６ａに傷が発生する虞もあり、転動体（玉）６の転動面６ａに傷が発生した場合には、軸受に異音が生じたり軸受の寿命が低下する虞があった。
特許第２８５０１８２号公報 However, in this method, in the step of inserting the ball cage assembly into the outer ring raceway surface 21, the axis of the outer ring 2 and the shaft of the ball cage assembly (the assembly of the cage 7 and the rolling element (ball) 6). It is preferred that the hearts are aligned with concentricity. If a deviation occurs in both shaft centers, the rolling element (ball) 6 and the small diameter portion of the outer ring 2 may collide with each other depending on the degree of the deviation, which may cause friction. Further, depending on the degree of friction, there is a possibility that the rolling surface 6a of the rolling element (ball) 6 may be damaged. If the rolling surface 6a of the rolling element (ball) 6 is damaged, the bearing may be damaged. There is a possibility that noise may occur or the life of the bearing may be reduced.
Japanese Patent No. 2850182

本発明の目的は、転動体を傷つけることなく容易に組み立てが可能で高品質な軸受ユニットを提供することである。   An object of the present invention is to provide a high-quality bearing unit that can be easily assembled without damaging rolling elements.

上記課題を達成するために、本発明が成した技術的手段は、内径側に複列の外輪軌道面を備えた外輪と、該複列の外輪軌道面に対向してそれぞれ外径側に内輪軌道面を備えた別体の内輪と、該外内輪間に転動自在に組み込まれ、複列に配された複数の転動体と、該複列に配されたそれぞれの転動体を所定間隔で保持する樹脂製保持器とを備えた複列の軸受ユニットであって、前記それぞれの保持器は、小径に形成された基部と、該基部から所定の間隔で軸方向に延出するとともに先端側に向けて徐々に大径となるように形成された柱部と、その柱部間に形成され、転動体を収容可能なポケットと、保持器の外径寸法が外輪軌道面の最大径よりも僅かに小径の外径寸法となるように外径周面から外径方向に突出した外径突出部を備え、外輪軌道面の軸受外方側には、前記外径突出部の外径寸法よりも小径の内径寸法を有して軸受内径方向に突出した小径部を備えており、前記小径部は、その断面形状が略三角形となるように軸方向の両裾部から狭まるなだらかな先細り状をなし、前記保持器と前記転動体の組立品を前記外輪軌道面に挿入する際、前記外径突出部が前記小径部に接触して押圧されることで、前記保持器が軸受軸心方向へ弾性変形され、前記ポケットに収容された転動体は、前記小径部と接触することなく該小径部を通過することを特徴とする軸受ユニットとしたことである。
この場合、かかる軸受ユニットには、保持器と内輪が係合して保持器を位置決めする係合構造を備えることが好ましく、前記係合構造としては、前記保持器の基部に、その内径面に軸受内径方向に突出した内径突出部を設け、前記内輪に、前記内径突出部を嵌合可能な凹溝を周方向に連続して設ければよい。 In order to achieve the above object, the technical means of the present invention includes an outer ring having a double row outer ring raceway surface on the inner diameter side, and an inner ring on the outer diameter side facing the double row outer ring raceway surface. A separate inner ring having a raceway surface, a plurality of rolling elements arranged in a double row, and a plurality of rolling elements arranged in a double row, and the respective rolling elements arranged in the double row at a predetermined interval. A double-row bearing unit comprising a resin cage for holding, each of the cages having a base formed in a small diameter, an axially extending from the base at a predetermined interval, and a distal end side Columns formed to gradually increase in diameter toward the center, pockets formed between the columns, and capable of accommodating rolling elements, and the outer diameter of the cage is larger than the maximum diameter of the outer ring raceway surface The outer ring raceway has an outer diameter protrusion that protrudes in the outer diameter direction from the outer peripheral surface so as to have a slightly smaller outer diameter. Substantially the bearing outer side of, than the outer diameter dimension of the outer diameter protruding portion includes a small diameter portion protruding bearing bore direction has a small diameter inner diameter, said small diameter portion, whose cross-sectional shape It has a gentle tapering shape that narrows from both hems in the axial direction so as to form a triangle, and when the assembly of the cage and the rolling element is inserted into the outer ring raceway surface, the outer diameter protruding portion becomes the small diameter portion. The cage is elastically deformed in the axial direction of the bearing by being pressed in contact, and the rolling element accommodated in the pocket passes through the small diameter part without contacting the small diameter part. This is a bearing unit.
In this case, it is preferable that the bearing unit includes an engagement structure for positioning the retainer by engaging the retainer and the inner ring. As the engagement structure, a base portion of the retainer is provided on an inner diameter surface thereof. An inner diameter projecting portion projecting in the bearing inner diameter direction is provided, and a concave groove capable of fitting the inner diameter projecting portion is provided continuously in the circumferential direction in the inner ring.

本発明によれば、転動体を傷つけることなく容易に組み立てが可能で高品質な軸受ユニットを提供することができる。   According to the present invention, it is possible to provide a high-quality bearing unit that can be easily assembled without damaging the rolling elements.

以下、本発明の一実施の形態に係る軸受ユニットについて、添付図面に基づいて説明する。なお、本実施形態の軸受ユニットの概略構成は上述した従来の複列の軸受ユニットと同様であり、保持器（冠型保持器）７の構成及びその保持器７と軸受内外輪２，４との係合構造に特徴を有するので、ここでは概略構成の説明を省略し、本実施形態に係る軸受ユニットの特徴部分を中心に説明する。   Hereinafter, a bearing unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. The schematic configuration of the bearing unit of the present embodiment is the same as that of the conventional double row bearing unit described above. The configuration of the cage (crown type cage) 7 and the cage 7 and the bearing inner and outer rings 2, 4 Therefore, the description of the schematic configuration is omitted here, and the description will focus on the characteristic portion of the bearing unit according to the present embodiment.

本実施形態の保持器７は、図１〜図４に示すように、保持器７の柱部９の先端側９ａには、その外径周面９ｂから軸受外径方向に先細りの円筒形状を形成して突出した外径突出部１０を備えている。その際、保持器７の外径寸法（当該外径突出部１０の先端部を結んだ仮想円の寸法）は、軸受が組み立てられた場合における外輪軌道面２１の最大径（第２図中Ｄ６参照）よりも僅かに小径（同図中Ｄ５参照）となる外径寸法を有している。
また、外輪２の外輪軌道面２１の軸方向外方側（同図中左向き矢印参照）には、軸受内径方向（同図中下向き矢印参照）に向けて、前記外径突出部１０の外径寸法Ｄ５よりも小径（同図中Ｄ４参照）となる内径寸法で突出した小径部２２が周方向に連続して備えられている。なお、小径部２２の断面形状は両裾部が外輪軌道面２１の最大径Ｄ６からなだらかに膨出した形状となっている。 As shown in FIGS. 1 to 4, the cage 7 of the present embodiment has a cylindrical shape that is tapered from the outer peripheral surface 9 b to the bearing outer radial direction on the distal end side 9 a of the column portion 9 of the cage 7. An outer diameter protruding portion 10 formed and protruded is provided. At that time, the outer diameter dimension of the cage 7 (the dimension of the virtual circle connecting the tip of the outer diameter protrusion 10) is the maximum diameter of the outer ring raceway surface 21 when the bearing is assembled (D6 in FIG. 2). The outer diameter is slightly smaller (see D5 in the figure).
Further, on the outer side of the outer ring raceway surface 21 of the outer ring 2 in the axial direction (see the left-pointing arrow in the figure), the outer diameter of the outer-diameter protruding portion 10 is directed toward the bearing inner diameter direction (see the down-pointing arrow in the figure). A small-diameter portion 22 that protrudes with an inner diameter dimension that is smaller than the dimension D5 (see D4 in the figure) is continuously provided in the circumferential direction. In addition, the cross-sectional shape of the small diameter portion 22 is a shape in which both skirt portions gently bulge from the maximum diameter D6 of the outer ring raceway surface 21.

なお、本実施形態による保持器７も樹脂材料により成形されており弾性を備えている。樹脂材料としては、例えば、その樹脂材料として、例えば、４６ナイロンや６６ナイロンなどのポリアミド系樹脂や、ポリブチレンテレフタレートやポリフェレンサルサイド（ＰＰＳ）や、ポリアミドイミド（ＰＡＩ）や、熱可塑性ポリイミドや、ポリエーテルエーテルケトン（ＰＥＥＫ）や、ポリエーテルニトリル（ＰＥＮ）などが挙げられる。さらに、上記した樹脂に１０〜５０ｗｔ％の繊維状充填材（例えば、ガラス繊維や炭素繊維など）を適宜添加することにより、保持器の合成及び寸法精度を向上させても良い。   The cage 7 according to the present embodiment is also formed of a resin material and has elasticity. Examples of the resin material include, for example, polyamide resins such as 46 nylon and 66 nylon, polybutylene terephthalate, polyferlen salside (PPS), polyamide imide (PAI), thermoplastic polyimide, Examples include polyether ether ketone (PEEK) and polyether nitrile (PEN). Furthermore, you may improve the synthesis | combination and dimensional accuracy of a holder | retainer by adding suitably 10-50 wt% fibrous filler (for example, glass fiber, carbon fiber, etc.) to the above-mentioned resin.

玉保持器組立品（保持器７と転動体（玉）６の組立品）を外輪軌道面２１に挿入する際には、図３に示すように、小径部２２が保持器７の外径突出部１０を軸受軸心方向（同図中下向き矢印参照）に押圧する。
このとき、保持器７はその弾性によってポケットＰに収容された転動体（玉）６とともに軸受軸心方向（同図中下向き矢印参照）に撓んで、外径突出部１０の外径寸法（同図中Ｄ４参照）と小径部２２の内径寸法（同図中Ｄ５参照）が等しくなる。
これにより、転動体（玉）６は前記小径部２２と接触することなく前記小径部２２を通過する。外輪軌道面２１に挿入する際に、転動体（玉）６の転動面６ａが外輪２の小径部２２と衝突することがないので、摩擦も生じず、転動面６ａが傷付くこともない。 When the ball cage assembly (an assembly of the cage 7 and the rolling element (ball) 6) is inserted into the outer ring raceway surface 21, the small diameter portion 22 protrudes from the cage 7 as shown in FIG. The portion 10 is pressed in the bearing axial direction (see the downward arrow in the figure).
At this time, the retainer 7 bends together with the rolling elements (balls) 6 accommodated in the pockets P due to its elasticity to the bearing axial direction (see the downward arrow in the figure), and the outer diameter dimension (same as the same) The inside diameter dimension (see D5 in the figure) of the small diameter portion 22 becomes equal.
Thereby, the rolling element (ball) 6 passes through the small diameter portion 22 without contacting the small diameter portion 22. When inserted into the outer ring raceway surface 21, the rolling surface 6a of the rolling element (ball) 6 does not collide with the small-diameter portion 22 of the outer ring 2, so that friction does not occur and the rolling surface 6a may be damaged. Absent.

また、上述の構成によれば、玉保持器組立品を外輪軌道面２１に挿入する工程において、外輪２の軸心と玉保持器組立品（保持器７と転動体（玉）６の組立品）の軸心が同心度を保たずに双方の軸心にズレが生じた場合であっても、保持器７の外径突出部１０が外輪２の小径部２２に当たるので、転動体（玉）６の転動面６ａが小径部２２と衝突することがない。   Further, according to the above-described configuration, in the step of inserting the ball cage assembly into the outer ring raceway surface 21, the shaft center of the outer ring 2 and the ball cage assembly (the assembly of the cage 7 and the rolling element (ball) 6). ), The outer diameter protruding portion 10 of the cage 7 contacts the small diameter portion 22 of the outer ring 2, so that the rolling element (ball) 6) The rolling surface 6a of 6 does not collide with the small diameter portion 22.

さらに、前記玉保持器組立品が外輪軌道面２１に挿入された後には、図４に示すように、保持器７はその復元力によって前記撓みが開放されて中立状態に復元する。
このとき、保持器７の外径突出部１０の外径寸法（同図中Ｄ４参照）が外輪２の小径部２２の内径寸法（同図中Ｄ５参照）よりも大径となって、小径部２２に引っ掛かるため、玉保持器組立品が簡単には脱落しなくなる。
これにより、外輪軌道面２１に挿入する際に、転動体（玉）６の転動面６ａが外輪２の小径部２２と衝突することがないので、摩擦も生じず、転動面６ａが傷付くこともない。
なお、本実施形態による外輪の小径部２２の内径寸法Ｄ５は、前記従来の構成による小径部２２の内径寸法（図７中Ｄ６参照）よりも大径に形成することができるので、この点においても、転動体（玉）６の転動面６ａと小径部２２との衝突が避けられる。 Further, after the ball cage assembly is inserted into the outer ring raceway surface 21, as shown in FIG. 4, the cage 7 is released by the restoring force to be restored to the neutral state.
At this time, the outer diameter dimension (see D4 in the figure) of the outer diameter protruding part 10 of the cage 7 is larger than the inner diameter dimension (see D5 in the figure) of the small diameter part 22 of the outer ring 2, and the smaller diameter part. The ball cage assembly will not easily fall off.
Thereby, when inserted in the outer ring raceway surface 21, the rolling surface 6a of the rolling element (ball) 6 does not collide with the small diameter portion 22 of the outer ring 2, so that friction does not occur and the rolling surface 6a is damaged. There is no sticking.
Note that the inner diameter D5 of the small diameter portion 22 of the outer ring according to the present embodiment can be formed to have a larger diameter than the inner diameter size (see D6 in FIG. 7) of the small diameter portion 22 according to the conventional configuration. In addition, collision between the rolling surface 6a of the rolling element (ball) 6 and the small diameter portion 22 is avoided.

また、本実施形態による軸受ユニットの構成によれば、保持器７と内輪４（内輪構成体５，５）が係合して保持器７を位置決めする係合構造を備えることができる。
例えば、保持器７の基部８の内径面８ａに軸受内径方向に突出した内径突出部１１を設けている。さらに、内輪４（内輪構成体５，５）には、内輪４組み込み後に保持器７の内径突出部１１と嵌合可能な位置に凹溝３１を周方向に連続して設けている。 Moreover, according to the structure of the bearing unit by this embodiment, the retainer 7 and the inner ring | wheel 4 (inner ring structure 5,5) can engage, and the engagement structure which positions the retainer 7 can be provided.
For example, an inner diameter protruding portion 11 protruding in the bearing inner diameter direction is provided on the inner diameter surface 8 a of the base portion 8 of the cage 7. Further, in the inner ring 4 (inner ring constituting bodies 5 and 5), a groove 31 is continuously provided in the circumferential direction at a position where the inner ring 4 can be fitted with the inner diameter protruding portion 11 of the cage 7 after the inner ring 4 is assembled.

この場合には、内輪４（内輪構成体５，５）を挿入する際に、保持器７の内径突出部１１が内輪４の端面（内輪軌道面４１の内方側端面）によって押され、その弾性により撓むことにより、内輪４を所定位置に向けて押し込むことが可能となる。
内輪４が所定位置に押し込まれた場合には、保持器７の内径突出部１１と内輪４の凹溝３１の位置が一致するので、保持器７の復元力によって保持器７が中立状態となって、保持器７の内径突出部１１と内輪４の凹溝３１が嵌合する。
これにより、保持器７が所定位置に位置決めされることとなる。 In this case, when inserting the inner ring 4 (inner ring components 5, 5), the inner diameter protruding portion 11 of the cage 7 is pushed by the end surface of the inner ring 4 (the inner side end surface of the inner ring raceway surface 41). By bending due to elasticity, the inner ring 4 can be pushed toward a predetermined position.
When the inner ring 4 is pushed into a predetermined position, the position of the inner diameter protruding portion 11 of the retainer 7 and the position of the concave groove 31 of the inner ring 4 coincide, so that the retainer 7 becomes neutral due to the restoring force of the retainer 7. Thus, the inner diameter protruding portion 11 of the cage 7 and the concave groove 31 of the inner ring 4 are fitted.
Thereby, the holder | retainer 7 will be positioned in a predetermined position.

なお、本実施形態では、外輪２の小径部２２が周方向に連続して備えられる構成としたが、小径部２２は、保持器７の外径突出部１０と当接可能であれば断続して備えられていても良い。
また、上述の実施形態では、複列のハブユニット軸受に備えられ使用されるものとして説明したが、上述した組み立て手順が採用されている軸受ユニットであれば、他の用途に供される軸受ユニットであっても適用可能である。 In the present embodiment, the small-diameter portion 22 of the outer ring 2 is continuously provided in the circumferential direction. However, the small-diameter portion 22 is intermittent as long as it can contact the outer-diameter protruding portion 10 of the cage 7. May be provided.
Moreover, in the above-mentioned embodiment, although it demonstrated as what is equipped and used for a double row hub unit bearing, if it is a bearing unit in which the assembly procedure mentioned above is employ | adopted, the bearing unit used for another use Even so, it is applicable.

本発明による軸受ユニットに使用される保持器の柱部の先端側外周面の形状を示す一部拡大図である。It is a partially expanded view which shows the shape of the front end side outer peripheral surface of the pillar part of the holder | retainer used for the bearing unit by this invention. 本発明による軸受ユニットの組み立て状態を示す一部拡大断面図である。It is a partially expanded sectional view which shows the assembly state of the bearing unit by this invention. 外輪転動面に玉保持器組立品を組み込む状態を示す一部拡大断面図である。It is a partially expanded sectional view which shows the state which incorporates a ball cage assembly in an outer ring rolling surface. 外輪軌道面に玉保持器組立品を組み込んだ後の状態を示す一部拡大断面図である。It is a partially expanded sectional view which shows the state after incorporating the ball holder assembly in the outer ring raceway surface. 従来の軸受ユニットの概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the conventional bearing unit. 従来の保持器の構造を示す一部断面側面図である。It is a partial cross section side view which shows the structure of the conventional holder | retainer. 従来の軸受ユニットであって外輪軌道面に保持器を組み込んだ後の状態を示す一部拡大断面図である。It is a partially expanded sectional view which shows the state after it is a conventional bearing unit and a cage | basket was integrated in the outer ring raceway surface.

符号の説明Explanation of symbols

２ 外輪
４ 内輪
６ 転動体（玉）
７ 保持器
９ｂ 保持器の外径周面
１０ 外径突出部
２２ 小径部
２１ 外輪軌道面
４１ 内輪軌道面
Ｐ 保持器のポケット 2 Outer ring 4 Inner ring 6 Rolling element (ball)
7 Cage 9b Outer Diameter Peripheral Surface 10 Outer Diameter Projection 22 Small Diameter Part 21 Outer Raceway Surface 41 Inner Ring Raceway P Cage Pocket

Claims (2)

内径側に複列の外輪軌道面を備えた外輪と、該複列の外輪軌道面に対向してそれぞれ外径側に内輪軌道面を備えた別体の内輪と、該外内輪間に転動自在に組み込まれ、複列に配された複数の転動体と、該複列に配されたそれぞれの転動体を所定間隔で保持する樹脂製保持器とを備えた複列の軸受ユニットであって、
前記それぞれの保持器は、小径に形成された基部と、該基部から所定の間隔で軸方向に延出するとともに先端側に向けて徐々に大径となるように形成された柱部と、その柱部間に形成され、転動体を収容可能なポケットと、保持器の外径寸法が外輪軌道面の最大径よりも僅かに小径の外径寸法となるように外径周面から外径方向に突出した外径突出部を備え、
外輪軌道面の軸受外方側には、前記外径突出部の外径寸法よりも小径の内径寸法を有して軸受内径方向に突出した小径部を備えており、
前記小径部は、その断面形状が略三角形となるように軸方向の両裾部から狭まるなだらかな先細り状をなし、
前記保持器と前記転動体の組立品を前記外輪軌道面に挿入する際、前記外径突出部が前記小径部に接触して押圧されることで、前記保持器が軸受軸心方向へ弾性変形され、前記ポケットに収容された転動体は、前記小径部と接触することなく該小径部を通過することを特徴とする軸受ユニット。 An outer ring having a double row outer ring raceway surface on the inner diameter side, a separate inner ring having an inner ring raceway surface on the outer diameter side opposite to the double row outer ring raceway surface, and rolling between the outer and inner rings A double-row bearing unit comprising a plurality of rolling elements that are freely incorporated and arranged in double rows, and a resin cage that holds the respective rolling elements arranged in the double rows at a predetermined interval. ,
Each of the cages includes a base portion formed to have a small diameter, a column portion that extends in an axial direction from the base portion at a predetermined interval, and is formed so as to gradually increase in diameter toward the tip side. A pocket formed between the pillars that can accommodate rolling elements, and an outer diameter direction from the outer diameter circumferential surface so that the outer diameter of the cage is slightly smaller than the maximum diameter of the outer ring raceway surface. With a protruding outer diameter
On the bearing outer side of the outer ring raceway surface is provided with a small-diameter portion having an inner diameter dimension smaller than the outer diameter dimension of the outer-diameter protruding portion and projecting in the bearing inner diameter direction ,
The small-diameter portion has a gently tapered shape that narrows from both hems in the axial direction so that the cross-sectional shape is substantially triangular,
When the assembly of the cage and the rolling element is inserted into the outer ring raceway surface, the outer diameter protruding portion comes into contact with the small diameter portion and is pressed so that the cage is elastically deformed in the bearing axial direction. The rolling element accommodated in the pocket passes through the small diameter portion without contacting the small diameter portion . 保持器と内輪が係合して保持器を位置決めする係合構造を備えており、It has an engagement structure that positions the cage by engaging the cage and the inner ring,
前記係合構造として、前記保持器の基部には、その内径面に軸受内径方向に突出した内径突出部が設けられ、前記内輪には、前記内径突出部を嵌合可能な凹溝が周方向に連続して設けられていることを特徴とする請求項１に記載の軸受ユニット。As the engagement structure, the base portion of the cage is provided with an inner diameter protruding portion that protrudes in the bearing inner diameter direction on the inner diameter surface, and the inner ring has a concave groove in which the inner diameter protruding portion can be fitted in the circumferential direction. The bearing unit according to claim 1, wherein the bearing unit is provided continuously.
JP2006330870A 2006-12-07 2006-12-07 Bearing unit Expired - Fee Related JP4893282B2 (en)

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DE102018116860A1 (en) * 2018-07-12 2020-01-16 Schaeffler Technologies AG & Co. KG Cage for an angular contact ball bearing, angular contact ball bearing with the cage and method for mounting the cage in the angular contact ball bearing
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