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JP2008106795A - Resin end cap structure and hub bearing for driven wheel - Google Patents

Resin end cap structure and hub bearing for driven wheel Download PDF

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Publication number
JP2008106795A
JP2008106795A JP2006287651A JP2006287651A JP2008106795A JP 2008106795 A JP2008106795 A JP 2008106795A JP 2006287651 A JP2006287651 A JP 2006287651A JP 2006287651 A JP2006287651 A JP 2006287651A JP 2008106795 A JP2008106795 A JP 2008106795A
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Prior art keywords
resin
end cap
diameter
outer ring
ring
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JP2006287651A
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Japanese (ja)
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Yasuyoshi Suzuki
康誉 鈴木
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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
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • 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
    • F16C19/186—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 three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • 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
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region

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

Abstract

【課題】信頼性の高いホイール用軸受の防水機構としての樹脂製エンドキャップ構造及び従動輪用ハブ軸受を提供すること。
【解決手段】回転速度検出装置付転がり軸受の外輪８の車体内側には、樹脂製エンドキャップ６０が装着してある。この樹脂製エンドキャップ６０は、フランジ部６１ａを有すると共に外輪８の内周側に嵌合する嵌合部６１ｂを有する芯金６１と、この芯金６１の周囲に樹脂成形して形成してあり且つ回転センサーの取付孔６２ａを有する樹脂成形部６２と、この樹脂成形部６２と一体成形されたネジ孔６２ｂを有するナット相当部材６２ｃと、外輪８の端部、芯金６１の外周側、及び樹脂成形部６２の端部との間に装着されるＯリング６３と、からなる。樹脂成形部６２と接している芯金６１の部分は、嵌合部６１ｂの径より縮径してある縮径部６１ｃに形成してある。
【選択図】図１The present invention provides a resin end cap structure and a driven wheel hub bearing as a highly reliable waterproof mechanism for a wheel bearing.
A resin end cap 60 is mounted on the inner side of an outer ring 8 of a rolling bearing with a rotational speed detection device. The resin end cap 60 is formed by resin molding around a cored bar 61 having a flange part 61 a and a fitting part 61 b fitted into the inner peripheral side of the outer ring 8. And a resin molding portion 62 having a rotation sensor mounting hole 62a, a nut equivalent member 62c having a screw hole 62b integrally formed with the resin molding portion 62, the end of the outer ring 8, the outer peripheral side of the core metal 61, and And an O-ring 63 mounted between the end portions of the resin molding portion 62. The portion of the cored bar 61 that is in contact with the resin molded portion 62 is formed in a reduced diameter portion 61c that is reduced in diameter from the diameter of the fitting portion 61b.
[Selection] Figure 1

Description

本発明は、主にホイール用軸受の防水機構としての樹脂製エンドキャップ構造及び従動輪用ハブ軸受に関する。   The present invention mainly relates to a resin end cap structure as a waterproof mechanism for a wheel bearing and a hub bearing for a driven wheel.

ホイール用軸受は、路面からの泥水の跳ね掛け条件に晒されるため、軸受内に泥水が浸入して軸受寿命が低下することを防ぐため、強靭なシール構造が必要である。   Since the wheel bearing is exposed to the condition of splashing muddy water from the road surface, a tough seal structure is required to prevent the muddy water from entering the bearing and reducing the bearing life.

そのため、従動輪用ハブでは、駆動用トルクを伝達するための軸を軸受内に貫通させる必要がないことから、エンドキャップで完全にふさいでしまうことが一般的である。   For this reason, in the driven wheel hub, it is not necessary to penetrate the shaft for transmitting the driving torque into the bearing. Therefore, the driven wheel hub is generally completely covered with the end cap.

従来、このエンドキャップは、金属製が多かったが、近年、回転センサー付軸受の需要が高まり、回転センサーの取付け機構を併せ持つ必要性から、芯金とその周囲に射出成形された樹脂からなる構造の樹脂製エンドキャップが増えてきた。   Conventionally, this end cap was mostly made of metal, but in recent years, the demand for bearings with rotation sensors has increased, and due to the necessity of having a rotation sensor mounting mechanism, a structure consisting of a cored bar and a resin injection-molded around it The number of plastic end caps has increased.

この樹脂製エンドキャップは、芯金と、Ｏリングと、樹脂成形部（センサーを支持する部分を含む）とからなる。   The resin end cap includes a cored bar, an O-ring, and a resin molded part (including a part that supports the sensor).

これらのうち、芯金は、下記のような役割を担っている。
（１）外輪内径部に強固に嵌合する。一般に樹脂成形部の外面を、強固な嵌合が可能なほど高精度に成形することは、成形収縮を考えると困難である。
（２）樹脂製エンドキャップを外輪内径部に圧入する時の、圧入力を伝達する。芯金の車体内側がフランジ状に曲げられている理由は、嵌合面となる芯金円筒部の精度維持だけでなく、圧入時の押面補強の目的がある。 Of these, the core metal plays the following role.
(1) Fits firmly into the inner diameter of the outer ring. In general, it is difficult to mold the outer surface of the resin molded portion with high accuracy so as to allow a strong fitting.
(2) Transmits pressure input when press fitting the resin end cap into the inner diameter of the outer ring. The reason why the inner side of the core bar is bent into a flange shape is not only to maintain the accuracy of the cylindrical core part serving as the fitting surface, but also to reinforce the pressing surface during press-fitting.

図６（ａ）は、特許文献１に係る回転速度検出装置付転がり軸受ユニットの断面図であり、（ｂ）は、（ａ）の右部の拡大図である。   Fig.6 (a) is sectional drawing of the rolling bearing unit with a rotational speed detection apparatus concerning patent document 1, (b) is an enlarged view of the right part of (a).

内輪相当部材であるハブ１の外端部（軸方向に関して外とは車両への組み付け状態で車両の幅方向外となる側を言い、各図の左）外周面には、車輪を固定する為のフランジ部２を形成し、中間部外周面には、内輪軌道３ａと段部４とを形成している。又、このハブ１の外周面には、その外周面に内輪軌道３ｂを形成し、上記ハブ１と共に内輪相当部材を構成する内輪５を、その外端面を上記段部４に突き当てた状態で外嵌支持している。尚、上記内輪軌道３ａは、ハブ１の外周面に直接形成する代りに、ハブ１とは別体の内輪（図示せず）に形成し、この内輪と上記内輪５とを、ハブ１に外嵌固定する場合もある。   In order to fix the wheel to the outer peripheral surface of the hub 1 which is a member corresponding to the inner ring (outside in the axial direction means the side outside the width direction of the vehicle when assembled to the vehicle, left in each figure) The inner ring raceway 3a and the stepped part 4 are formed on the outer peripheral surface of the intermediate part. In addition, an inner ring raceway 3b is formed on the outer peripheral surface of the hub 1, and the inner ring 5 that constitutes an inner ring equivalent member together with the hub 1 is in a state in which the outer end surface abuts against the stepped portion 4. Supports external fitting. The inner ring raceway 3a is not formed directly on the outer peripheral surface of the hub 1, but is formed on an inner ring (not shown) separate from the hub 1, and the inner ring and the inner ring 5 are connected to the hub 1. In some cases, it is fixed.

又、ハブ１の内端寄り部分（軸方向に関して内とは車両への組み付け状態で車両の幅方向中央となる側を言い、各図の右）には雄ねじ部６を形成している。そして、この雄ねじ部６に螺合し更に緊締したナット７により、上記内輪５をハブ１の外周面の所定部分に固定して、内輪相当部材を構成している。ハブ１の周囲に配置された外輪８の中間部外周面には、この外輪８を懸架装置に固定する為の取付部９を設けている。又、この外輪８の内周面には、それぞれが上記各内輪軌道３ａ、３ｂに対向する、外輪軌道１０ａ、１０ｂを形成している。そして、これら各内輪軌道３ａ、３ｂと外輪軌道１０ａ、１０ｂとの間に、それぞれ複数ずつの転動体１１、１１を設けて、外輪８の内側でのハブ１の回転を自在としている。尚、図示の例では、転動体１１、１１として玉を使用しているが、重量の嵩む自動車用の転がり軸受ユニットの場合には、転動体としてテーパころを使用する場合もある。又、上記外輪８の外端部内周面と、ハブ１の外周面との間には、シールリング１２を装着して、外輪８の内周面と上記ハブ１の外周面との間に存在し、上記複数の転動体１１、１１を設けた空間の外端開口部を塞いでいる。なお、符号１３ａは、トーンホイール、符号２２ａは、永久磁石、符号２４ａは、コイル、符号２８は、切り欠き、符号２９ａは、ボビン、符号３８は、第一のステータ、符号３９は、第二のステータ、符号４０は、切り欠き、符号４１は、通孔、符号４２は、凸部である。   Further, a male screw portion 6 is formed at a portion near the inner end of the hub 1 (inner side in the axial direction means a side which is the center in the width direction of the vehicle when assembled to the vehicle, and the right side in each figure). The inner ring 5 is fixed to a predetermined portion of the outer peripheral surface of the hub 1 by a nut 7 screwed into the male screw portion 6 and further tightened to constitute an inner ring equivalent member. A mounting portion 9 for fixing the outer ring 8 to the suspension device is provided on the outer peripheral surface of the intermediate portion of the outer ring 8 disposed around the hub 1. Further, outer ring raceways 10a and 10b are formed on the inner peripheral surface of the outer ring 8 so as to face the inner ring raceways 3a and 3b, respectively. A plurality of rolling elements 11, 11 are provided between the inner ring raceways 3a, 3b and the outer ring raceways 10a, 10b, respectively, so that the hub 1 can freely rotate inside the outer ring 8. In the illustrated example, balls are used as the rolling elements 11, 11, but in the case of a rolling bearing unit for automobiles that is heavy in weight, tapered rollers may be used as the rolling elements. A seal ring 12 is mounted between the outer peripheral surface of the outer ring 8 and the outer peripheral surface of the hub 1, and exists between the inner peripheral surface of the outer ring 8 and the outer peripheral surface of the hub 1. And the outer-end opening part of the space which provided the said some rolling elements 11 and 11 is plugged up. Reference numeral 13a is a tone wheel, reference numeral 22a is a permanent magnet, reference numeral 24a is a coil, reference numeral 28 is a notch, reference numeral 29a is a bobbin, reference numeral 38 is a first stator, and reference numeral 39 is a second. The reference numeral 40 is a notch, the reference numeral 41 is a through hole, and the reference numeral 42 is a convex portion.

外輪８の内端開口部には合成樹脂製のカバー１８ｂを被着して、この外輪８の内端開口部を塞いでいる。このカバー１８ｂの外側面側にはセンサ２０ｂの内端部を包埋している。円環状に形成された、このセンサ２０ｂの外半部は、上記カバー１８ｂの外側面から外方に突出している。又、上記カバー１８ｂの内側面には、上記センサ２０ｂの検出信号を取り出す為のコネクタ３０を、このカバー１８ｂと一体に形成している。この様なカバー１８ｂの外側面で、外周縁よりも少し直径方向内方に寄った部分には、外方に突出した凸部３２を、全周に亙って形成している。上記センサ２０ｂの内端部は、この凸部３２の直径方向中央部に包埋している。   A cover 18b made of synthetic resin is attached to the inner end opening of the outer ring 8, and the inner end opening of the outer ring 8 is closed. The inner end portion of the sensor 20b is embedded on the outer surface side of the cover 18b. The outer half of the sensor 20b formed in an annular shape protrudes outward from the outer surface of the cover 18b. A connector 30 for taking out the detection signal of the sensor 20b is formed integrally with the cover 18b on the inner surface of the cover 18b. On the outer surface of such a cover 18b, a convex portion 32 protruding outward is formed over the entire circumference at a portion slightly inward in the diameter direction from the outer peripheral edge. The inner end portion of the sensor 20b is embedded in the central portion of the convex portion 32 in the diameter direction.

そして、上記凸部３２の外周面に沿って、スリーブ３１を添設している。このスリーブ３１は、ステンレス鋼板等の金属板を、断面Ｌ字形で全体を円環状に形成して成り、円筒部３３と、この円筒部３３の内端縁から直径方向外方に折れ曲がった、外向フランジ状の鍔部３４とを有する。このうちの円筒部３３は、上記凸部３２の外周面に沿って配設され、更にこの凸部３２の先端縁（外端縁）から外方に突出している。従って、上記円筒部３３の先端部の内外両周面は、上記カバー１８ｂを構成する合成樹脂に覆われていない。一方、上記鍔部３４は、上記カバー１８ｂの外周縁部で上記凸部３２よりも直径方向外方に存在する部分の厚さ方向中央部に包埋されている。尚、この鍔部３４の外周縁は、上記カバー１８ｂの外周縁にまでは達せず、このカバー１８ｂの内部に包埋されている。   A sleeve 31 is attached along the outer peripheral surface of the convex portion 32. This sleeve 31 is formed by forming a metal plate such as a stainless steel plate into an annular shape as a whole with an L-shaped cross section, and is bent outwardly in the diameter direction from the inner end edge of the cylindrical portion 33 and the cylindrical portion 33. And a flange-like flange 34. Of these, the cylindrical portion 33 is disposed along the outer peripheral surface of the convex portion 32, and further protrudes outward from the tip edge (outer end edge) of the convex portion 32. Therefore, the inner and outer peripheral surfaces of the tip of the cylindrical portion 33 are not covered with the synthetic resin constituting the cover 18b. On the other hand, the flange portion 34 is embedded in the central portion in the thickness direction of the outer peripheral edge portion of the cover 18b, which is present on the outer side in the diameter direction than the convex portion 32. The outer peripheral edge of the flange 34 does not reach the outer peripheral edge of the cover 18b, but is embedded in the cover 18b.

上述の様なスリーブ３１を設けたカバー１８ｂを嵌合固定する、外輪８の内端開口部内周縁には、面取り部３５を形成している。上記カバー１８ｂにより外輪８の内端開口部を塞ぐ場合には、上記スリーブ３１をこの外輪８の内端部に内嵌し、上記カバー１８ｂの外側面外周寄り部分を当接させる。この状態で、このカバー１８ｂの外側面外周寄り部分と、上記円筒部３３の中間部外周面と、上記面取り部３５とにより三方を囲まれる、断面形状が三角形で全体が円環状の空間３６が形成される。回転速度検出装置付転がり軸受ユニットの場合には、この空間３６内にシールリングの一種であるＯリング３７を、弾性的に圧縮した状態で装着している。
特許第３６３３０４８号公報 A chamfered portion 35 is formed on the inner peripheral edge of the inner end opening of the outer ring 8 to which the cover 18b provided with the sleeve 31 as described above is fitted and fixed. When the inner end opening of the outer ring 8 is closed by the cover 18b, the sleeve 31 is fitted into the inner end of the outer ring 8, and the outer peripheral portion of the cover 18b is brought into contact with the outer peripheral portion. In this state, a space 36 having a triangular cross-sectional shape and an overall annular shape is surrounded on three sides by the outer surface outer peripheral portion of the cover 18b, the intermediate outer peripheral surface of the cylindrical portion 33, and the chamfered portion 35. It is formed. In the case of a rolling bearing unit with a rotational speed detection device, an O-ring 37, which is a kind of seal ring, is mounted in this space 36 in an elastically compressed state.
Japanese Patent No. 3633048

従来、芯金の構造は、特許文献１に係る図６（ａ）（ｂ）に見られるようにＬ字型であった。   Conventionally, the structure of the cored bar has been L-shaped as seen in FIGS.

また、他の従来例に係る図３、図４、及び図５（ａ）においても、芯金の構造は、Ｌ字型であった。   Moreover, also in FIG. 3, FIG. 4, and FIG. 5 (a) according to other conventional examples, the structure of the cored bar was L-shaped.

なお、図３は、従来例に係る回転速度検出装置付転がり軸受ユニットの断面図である。図４は、図３に示す従来例の要部の拡大図である。図５（ａ）は、図３に示す従来例の要部の拡大図である。   In addition, FIG. 3 is sectional drawing of the rolling bearing unit with a rotational speed detection apparatus based on a prior art example. FIG. 4 is an enlarged view of a main part of the conventional example shown in FIG. FIG. 5A is an enlarged view of a main part of the conventional example shown in FIG.

外輪８の車体内側には、樹脂製エンドキャップ５０が装着してある。この樹脂製エンドキャップ５０は、フランジ部５１ａを有すると共に外輪８の内周側に嵌合する嵌合部５１ｂを有する芯金５１と、この芯金５１の周囲に樹脂成形して形成してあり且つ回転センサーの取付孔５２ａとネジ孔５２ｂを有する樹脂成形部５２と、外輪８の端部、芯金５１の外周側、及び樹脂成形部５２の端部との間に装着されるＯリング５３と、からなる。   A resin end cap 50 is mounted on the inner side of the outer ring 8 on the vehicle body. The resin end cap 50 is formed by resin molding around a cored bar 51 having a flange part 51 a and a fitting part 51 b fitted into the inner peripheral side of the outer ring 8. An O-ring 53 is mounted between the resin molded part 52 having the rotation sensor mounting hole 52a and the screw hole 52b, and the end of the outer ring 8, the outer peripheral side of the cored bar 51, and the end of the resin molded part 52. And consist of

ところで、上述したように、芯金５１の構造がＬ字型であると、以下のような問題があった。
（１）嵌合部５１ｂがフランジ部５１ａから遠くなるため、嵌合部５１ｂの剛性・強度が低下し、嵌合力が低下する（図４）。
（２）嵌合部５１ｂとフランジ部５１ａの間の樹脂成形部５２が射出成形後に（図４の矢印方向に）収縮し、その影響で嵌合部分の寸法精度に悪影響が出て、嵌合力が低下する（図４）。
（３）芯金５１は、通常プレス加工でされているため、曲げ部の隅Ｒ寸法は、一般に板厚と同じくらいにする必要がある。そのため、フランジ部５１ａの外径寸法は、圧入時の押面補強の必要寸法より大きくなりがちとなる。その結果、樹脂製エンドキャップの外径と、芯金５１のフランジ部５１ａの外径との寸法差（Δｄ）が小さくなって、樹脂流れが悪化し、ボイドなどの成形不良が発生しやすい状態となる（図５（ａ））。 By the way, as mentioned above, there existed the following problems that the structure of the metal core 51 was L-shaped.
(1) Since the fitting part 51b is far from the flange part 51a, the rigidity and strength of the fitting part 51b are reduced, and the fitting force is reduced (FIG. 4).
(2) The resin molding part 52 between the fitting part 51b and the flange part 51a contracts after injection molding (in the direction of the arrow in FIG. 4), and this influences the dimensional accuracy of the fitting part, and the fitting force (FIG. 4).
(3) Since the cored bar 51 is normally pressed, the corner R dimension of the bent portion generally needs to be about the same as the plate thickness. Therefore, the outer diameter dimension of the flange portion 51a tends to be larger than the required dimension for pressing surface reinforcement during press-fitting. As a result, the dimensional difference (Δd) between the outer diameter of the resin end cap and the outer diameter of the flange portion 51a of the cored bar 51 becomes small, the resin flow deteriorates, and molding defects such as voids are likely to occur. (FIG. 5A).

本発明は、上述したような事情に鑑みてなされたものであって、信頼性の高いホイール用軸受の防水機構としての樹脂製エンドキャップ構造及び従動輪用ハブ軸受を提供することを目的とする。   The present invention has been made in view of the circumstances as described above, and an object thereof is to provide a resin end cap structure and a driven wheel hub bearing as a highly reliable waterproof mechanism for a wheel bearing. .

上記の目的を達成するため、本発明に係る樹脂製エンドキャップ構造は、
芯金と、その周囲に射出成形した樹脂成形部とを有し、
従動輪型ハブ軸受の車体内側の外輪の内径に、前記芯金の嵌合部を嵌合し、
前記軸受内への泥水の浸入を防止する樹脂製エンドキャップ構造において、
前記樹脂成形部と接している部分の前記芯金の径は、前記嵌合部の径より、縮径してあることを特徴とする。 In order to achieve the above object, the resin end cap structure according to the present invention comprises:
It has a metal core and a resin molded part that is injection molded around it.
Fit the cored bar fitting part to the inner diameter of the outer ring inside the vehicle body of the driven wheel type hub bearing,
In the resin end cap structure that prevents the intrusion of muddy water into the bearing,
A diameter of the cored bar in a portion in contact with the resin molded portion is reduced from a diameter of the fitting portion.

好適には、前記樹脂成形部は、回転センサーを装着する装着孔を有する。   Suitably, the said resin molding part has a mounting hole which mounts a rotation sensor.

また、本発明に係る従動輪用ハブ軸受は、請求項１又は２に記載の樹脂製エンドキャップ構造を具備することを特徴とする。   A hub bearing for a driven wheel according to the present invention comprises the resin end cap structure according to claim 1 or 2.

本発明によれば、樹脂成形部と接している部分の芯金の径は、嵌合部の径より縮径してある。   According to the present invention, the diameter of the core metal in contact with the resin molded portion is smaller than the diameter of the fitting portion.

これにより、嵌合部の近傍に段を入れることで、嵌合部の剛性・強度が向上する。また、成形収縮の影響も軽減でき、嵌合部の寸法精度が向上するため、嵌合力が向上する。   Thereby, the rigidity and intensity | strength of a fitting part improve by putting a step in the vicinity of a fitting part. Further, the influence of molding shrinkage can be reduced and the dimensional accuracy of the fitting portion is improved, so that the fitting force is improved.

さらに、芯金のフランジ部の径を小さくできるため、樹脂製エンドキャップの外径と芯金のフランジ部の外径との寸法差を増大することができる。これにより、樹脂流れが良くなり、ボイドなどの成形不良を防止することができる。   Furthermore, since the diameter of the flange portion of the cored bar can be reduced, the dimensional difference between the outer diameter of the resin end cap and the outer diameter of the flanged portion of the cored bar can be increased. Thereby, the resin flow is improved and molding defects such as voids can be prevented.

以下、本発明の実施の形態に係る樹脂製エンドキャップ構造及び従動輪用ハブ軸受を図面を参照しつつ説明する。   Hereinafter, a resin end cap structure and a driven wheel hub bearing according to an embodiment of the present invention will be described with reference to the drawings.

図１（ａ）は、本発明の実施の形態に係る回転速度検出装置付転がり軸受ユニットの要部の断面図であり、（ｂ）は、その側面図である。   Fig.1 (a) is sectional drawing of the principal part of the rolling bearing unit with a rotational speed detection apparatus concerning embodiment of this invention, (b) is the side view.

図２は、図１に示す本発明の実施の形態の要部の拡大図である。図５（ｂ）は、図１に示す本発明の実施の形態の要部の拡大図である。   FIG. 2 is an enlarged view of a main part of the embodiment of the present invention shown in FIG. FIG.5 (b) is an enlarged view of the principal part of embodiment of this invention shown in FIG.

本実施の形態では、回転速度検出装置付転がり軸受の外輪８の車体内側には、樹脂製エンドキャップ６０が装着してある。   In the present embodiment, a resin end cap 60 is mounted on the inner side of the outer ring 8 of the rolling bearing with a rotational speed detection device.

この樹脂製エンドキャップ６０は、フランジ部６１ａを有すると共に外輪８の内周側に嵌合する嵌合部６１ｂを有する芯金６１と、この芯金６１の周囲に樹脂成形して形成してあり且つ回転センサーの取付孔６２ａを有する樹脂成形部６２と、この樹脂成形部６２と一体成形されたネジ孔６２ｂを有するナット相当部材６２ｃと、外輪８の端部、芯金６１の外周側、及び樹脂成形部６２の端部との間に装着されるＯリング６３と、からなる。   The resin end cap 60 is formed by resin molding around a cored bar 61 having a flange part 61 a and a fitting part 61 b fitted into the inner peripheral side of the outer ring 8. And a resin molding portion 62 having a rotation sensor mounting hole 62a, a nut equivalent member 62c having a screw hole 62b integrally formed with the resin molding portion 62, the end of the outer ring 8, the outer peripheral side of the core metal 61, and And an O-ring 63 mounted between the end portions of the resin molding portion 62.

さて、本実施の形態では、樹脂成形部６２と接している芯金６１の部分は、嵌合部６１ｂの径より縮径してある縮径部６１ｃに形成してある。   In the present embodiment, the portion of the cored bar 61 that is in contact with the resin molded portion 62 is formed in a reduced diameter portion 61c that is reduced in diameter from the diameter of the fitting portion 61b.

これにより、嵌合部６１ｂの近傍に段を入れることで、嵌合部６１ｂの剛性・強度が向上する。また、成形収縮の影響も軽減でき、嵌合部６１ｂの寸法精度が向上するため、嵌合力が向上する。   Thereby, the rigidity and intensity | strength of the fitting part 61b improve by putting a step in the vicinity of the fitting part 61b. Further, the influence of molding shrinkage can be reduced and the dimensional accuracy of the fitting portion 61b is improved, so that the fitting force is improved.

さらに、芯金６１のフランジ部６１ａの径を小さくできるため、図５（ｂ）に示すように、樹脂製エンドキャップの外径と芯金６１のフランジ部６１ａの外径との寸法差（Δｄ）を増大することができる。これにより、樹脂流れが良くなり、ボイドなどの成形不良を防止することができる。   Furthermore, since the diameter of the flange portion 61a of the cored bar 61 can be reduced, the dimensional difference (Δd) between the outer diameter of the resin end cap and the outer diameter of the flanged part 61a of the cored bar 61 as shown in FIG. ) Can be increased. Thereby, the resin flow is improved and molding defects such as voids can be prevented.

なお、本実施の形態に係る回転速度検出装置付転がり軸受ユニットのうち上述した部分以外の従動輪用ハブ軸受構造部分は図６（ａ）、(ｂ)に示したものと同様である。   In the rolling bearing unit with a rotational speed detection device according to the present embodiment, the hub bearing structure portion for the driven wheel other than the portion described above is the same as that shown in FIGS. 6 (a) and 6 (b).

本発明は、上述した実施の形態に限定されず、種々変形可能である。   The present invention is not limited to the above-described embodiment, and various modifications can be made.

（ａ）は、本発明の実施の形態に係る回転速度検出装置付転がり軸受ユニットの要部の断面図であり、（ｂ）は、その側面図である。(A) is sectional drawing of the principal part of the rolling bearing unit with a rotational speed detection apparatus concerning embodiment of this invention, (b) is the side view. 図１に示す本発明の実施の形態の要部の拡大図である。It is an enlarged view of the principal part of embodiment of this invention shown in FIG. 従来例に係る回転速度検出装置付転がり軸受ユニットの断面図である。It is sectional drawing of the rolling bearing unit with a rotational speed detection apparatus concerning a prior art example. 図３に示す従来例の要部の拡大図である。It is an enlarged view of the principal part of the prior art example shown in FIG. （ａ）は、図３に示す従来例の要部の拡大図である。（ｂ）は、図１に示す本発明の実施の形態の要部の拡大図である。(A) is an enlarged view of the principal part of a prior art example shown in FIG. (B) is the enlarged view of the principal part of embodiment of this invention shown in FIG. （ａ）は、特許文献１に係る回転速度検出装置付転がり軸受ユニットの断面図であり、（ｂ）は、（ａ）の右部の拡大図である。(A) is sectional drawing of the rolling bearing unit with a rotational speed detection apparatus concerning patent document 1, (b) is an enlarged view of the right part of (a).

符号の説明Explanation of symbols

１ ハブ
２ フランジ部
３ａ、３ｂ 内輪軌道
４ 段部
５ 内輪
６ 雄ねじ部
７ ナット
８ 外輪
９ 取付部
１０ａ、１０ｂ 外輪軌道
１１ 転動体
１２ シールリング
１３ａ トーンホイール
１４ 小径部
１５、１５ａ 大径部
１６ 段部
１７ 透孔
１８ｂ カバー
２０ｂ センサ
２２ａ 永久磁石
２４ａ コイル
２８ 切り欠き
２９ａ ボビン
３０ コネクタ
３１ スリーブ
３２ 凸部
３３ 円筒部
３４ 鍔部
３５ 面取り部
３６ 空間
３７ Ｏリング
３８ 第一のステータ
３９ 第二のステータ
４０ 切り欠き
４１ 通孔
４２ 凸部
５０ 樹脂製エンドキャップ
５１ 芯金
５１ａ フランジ部
５１ｂ 嵌合部
５２ 樹脂成形部
５２ａ 回転センサーの取付孔
５２ｂ ネジ孔
５３ Ｏリング
６０ 樹脂製エンドキャップ
６１ 芯金
６１ａ フランジ部
６１ｂ 嵌合部
６１ｃ 縮径部
６２ 樹脂成形部
６２ａ 回転センサーの取付孔
６２ｂ ネジ孔
６２ｃ ナット相当部材
６３ Ｏリング５３ DESCRIPTION OF SYMBOLS 1 Hub 2 Flange part 3a, 3b Inner ring track 4 Step part 5 Inner ring 6 Male thread part 7 Nut 8 Outer ring 9 Mounting part 10a, 10b Outer ring track 11 Rolling element 12 Seal ring 13a Tone wheel 14 Small diameter part 15, 15a Large diameter part 16 step Part 17 Through-hole 18b Cover 20b Sensor 22a Permanent magnet 24a Coil 28 Notch 29a Bobbin 30 Connector 31 Sleeve 32 Protruding part 33 Cylindrical part 34 Girder part 35 Chamfering part 36 Space 37 O-ring 38 First stator 39 Second stator 40 Notch 41 Through-hole 42 Convex 50 Resin end cap 51 Core 51a Flange 51b Fitting 52 Resin molding 52a Rotation sensor mounting hole 52b Screw hole 53 O-ring 60 Resin end cap 61 Core 61a Flange 61b Fitting part 61c Reduced diameter part 62 Resin molding part 62a Rotation Mounting hole 62b of the Nsa screw hole 62c nut corresponds member 63 O-ring 53

Claims (3)

芯金と、その周囲に射出成形した樹脂成形部とを有し、
従動輪型ハブ軸受の車体内側の外輪の内径に、前記芯金の嵌合部を嵌合し、
前記軸受内への泥水の浸入を防止する樹脂製エンドキャップ構造において、
前記樹脂成形部と接している部分の前記芯金の径は、前記嵌合部の径より、縮径してあることを特徴とする樹脂製エンドキャップ構造。 It has a metal core and a resin molded part that is injection molded around it.
Fit the cored bar fitting part to the inner diameter of the outer ring inside the vehicle body of the driven wheel type hub bearing,
In the resin end cap structure that prevents the intrusion of muddy water into the bearing,
The diameter of the said metal core of the part which is in contact with the said resin molding part is diameter-reduced from the diameter of the said fitting part, The resin-made end cap structure characterized by the above-mentioned. 前記樹脂成形部は、回転センサーを装着する装着孔を有することを特徴とする請求項１に記載の樹脂製エンドキャップ構造。   The resin end cap structure according to claim 1, wherein the resin molded portion has a mounting hole for mounting a rotation sensor. 請求項１又は２に記載の樹脂製エンドキャップ構造を具備することを特徴とする従動輪用ハブ軸受。   A hub bearing for a driven wheel comprising the resin end cap structure according to claim 1.
JP2006287651A 2006-10-23 2006-10-23 Resin end cap structure and hub bearing for driven wheel Withdrawn JP2008106795A (en)

Priority Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011027781A1 (en) * 2009-09-02 2011-03-10 Ntn株式会社 Wheel bearing unit with rotating speed detection device
JP2015172408A (en) * 2014-03-12 2015-10-01 日本精工株式会社 Rolling bearing unit with rotational speed detector
JP2017009018A (en) * 2015-06-22 2017-01-12 日本精工株式会社 Wheel support bearing unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011027781A1 (en) * 2009-09-02 2011-03-10 Ntn株式会社 Wheel bearing unit with rotating speed detection device
JP2011052755A (en) * 2009-09-02 2011-03-17 Ntn Corp Wheel bearing unit with rotating speed detection device
CN102575714A (en) * 2009-09-02 2012-07-11 Ntn株式会社 Wheel bearing unit with rotating speed detection device
US8356940B2 (en) 2009-09-02 2013-01-22 Ntn Corporation Wheel bearing apparatus incorporated with a rotational speed detecting apparatus
US8641287B2 (en) 2009-09-02 2014-02-04 Ntn Corporation Wheel bearing apparatus incorporated with a rotational speed detecting apparatus
JP2015172408A (en) * 2014-03-12 2015-10-01 日本精工株式会社 Rolling bearing unit with rotational speed detector
JP2017009018A (en) * 2015-06-22 2017-01-12 日本精工株式会社 Wheel support bearing unit

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