JP5434647B2 - Wheel bearing unit - Google Patents

Wheel bearing unit Download PDF

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JP5434647B2
JP5434647B2 JP2010028831A JP2010028831A JP5434647B2 JP 5434647 B2 JP5434647 B2 JP 5434647B2 JP 2010028831 A JP2010028831 A JP 2010028831A JP 2010028831 A JP2010028831 A JP 2010028831A JP 5434647 B2 JP5434647 B2 JP 5434647B2
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cover
hole
wheel
connector
cover portion
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JP2011164016A (en
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達男 若林
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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
    • 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
    • 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
    • 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)
  • Rolling Contact Bearings (AREA)

Description

本発明は、例えば、センサ部を一体に備えたカバー部が静止輪の一端に備えられ、センサ部と非接触で対峙する被検知部が回転輪に備えられて、車輪の回転速度を検出する回転速度検出装置付きの車輪用軸受ユニットに関する。   In the present invention, for example, a cover portion integrally provided with a sensor portion is provided at one end of a stationary wheel, and a detected portion that faces the sensor portion in a non-contact manner is provided in a rotating wheel, and detects the rotational speed of the wheel. The present invention relates to a wheel bearing unit with a rotational speed detection device.

例えば、自動車などの車両においては、アンチロックブレーキシステム（Antilock Brake System：ＡＢＳ）やトラクションコントロールシステム（Traction Control System：ＴＣＳ）を制御するために、車輪の回転速度を検出する必要がある。
このため、車体側ハウジングに固定されて常時非回転状態に維持される静止輪（外輪部材）の一端に嵌め込まれたカバー部に、非接触で磁気的に検出するセンサ部を取り付け、そして、車輪に接続されて共に回転する回転輪（内輪部材）の端部に、センサ部と非接触で対峙する被検知部を取り付けることで、車輪の回転速度を検知している。 For example, in a vehicle such as an automobile, it is necessary to detect the rotational speed of a wheel in order to control an antilock brake system (ABS) or a traction control system (TCS).
For this reason, a sensor part that detects magnetically in a non-contact manner is attached to a cover part fitted to one end of a stationary wheel (outer ring member) that is fixed to the vehicle body side housing and maintained in a non-rotating state at all times, and the wheel The rotation speed of the wheel is detected by attaching a detected part that is opposed to the sensor part to the end part of the rotating wheel (inner ring member) that is connected to and rotates together.

例えば特許文献１及び特許文献２では、次のような構成が採用されている。
図５は、回転速度検出装置３を備えた従来の軸受ユニット２の縦断面図で、軸受ユニット２は、静止輪（外輪構成部材４）の内径側に回転輪（ハブ５及び内輪構成部材６）を回転自在に支持して構成されている。 For example, in Patent Document 1 and Patent Document 2, the following configuration is adopted.
FIG. 5 is a longitudinal sectional view of a conventional bearing unit 2 provided with a rotational speed detection device 3. The bearing unit 2 has a rotating wheel (a hub 5 and an inner ring constituting member 6) on the inner diameter side of a stationary wheel (outer ring constituting member 4). ) Is rotatably supported.

ハブ５の外端部（車両への組み付け状態で幅方向外側となる端部を言い、図の左端部。本明細書全体で同じ。）の外周面には、車輪を取り付けるための第一のフランジ７を、中間部外周面には第一の内輪軌道８を、それぞれ設けている。   A first end for attaching a wheel to the outer peripheral surface of the outer end of the hub 5 (referred to as an end on the outer side in the width direction in the assembled state in the vehicle, the left end in the figure, which is the same throughout the present specification). A flange 7 is provided, and a first inner ring raceway 8 is provided on the outer peripheral surface of the intermediate part.

内輪構成部材６は、その外周面に第二の内輪軌道９を有し、前記ハブ５の内端寄り部分に形成され、前記第一の内輪軌道８を設けた部分よりも外径寸法が小さくなった段部１０に外嵌している。そして、このハブ５の内端部に形成したかしめ部１５により内輪構成部材６の内端面を抑え付けて、このハブ５に対し結合固定している。
前記外輪構成部材４の内周面に、前記第一の内輪軌道８に対向する第一の外輪軌道１１及び前記第二の内輪軌道９に対向する第二の外輪軌道１２を、外周面に前記外輪構成部材４を懸架装置に支持するための第二のフランジ１３を、それぞれ形成している。
そして、前記第一、第二の内輪軌道８、９と前記第一、第二の外輪軌道１１、１２との間に、それぞれ複数個ずつの転動体１４、１４を設け、前記外輪構成部材４の内径側に前記ハブ５及び内輪構成部材６を回転自在に支持している。 The inner ring constituting member 6 has a second inner ring raceway 9 on the outer peripheral surface thereof, is formed in a portion near the inner end of the hub 5, and has an outer diameter smaller than that of the portion where the first inner ring raceway 8 is provided. It is fitted on the stepped portion 10. The inner end surface of the inner ring constituent member 6 is suppressed by a caulking portion 15 formed at the inner end portion of the hub 5, and is fixedly coupled to the hub 5.
A first outer ring raceway 11 facing the first inner ring raceway 8 and a second outer ring raceway 12 facing the second inner ring raceway 9 are arranged on the outer peripheral surface of the outer ring constituent member 4 on the inner peripheral surface. Second flanges 13 for supporting the outer ring constituent member 4 on the suspension device are respectively formed.
A plurality of rolling elements 14 and 14 are provided between the first and second inner ring raceways 8 and 9 and the first and second outer ring raceways 11 and 12, respectively. The hub 5 and the inner ring constituent member 6 are rotatably supported on the inner diameter side.

外輪構成部材４の一端（図１の右端）の開口部は、金属製のカバー部（エンドキャップともいう。）１６で塞いでいる。
カバー部１６は、前記一端の外径と略同一の外径で形成された円盤状の本体１７と、この本体１７の裏面側（図面で左側の面部）に一体に設けた嵌め合い部３３とで構成されている。嵌め合い部３３は、外輪構成部材４の一端の内周面に水密状に嵌め込んで固定し得る外径を有する円筒状に形成されている。 An opening at one end (the right end in FIG. 1) of the outer ring constituting member 4 is closed with a metal cover portion (also referred to as an end cap) 16.
The cover portion 16 includes a disc-shaped main body 17 formed with an outer diameter substantially the same as the outer diameter of the one end, and a fitting portion 33 provided integrally on the back surface side (left surface portion in the drawing) of the main body 17. It consists of The fitting portion 33 is formed in a cylindrical shape having an outer diameter that can be fitted and fixed to the inner peripheral surface of one end of the outer ring constituting member 4 in a watertight manner.

内輪構成部材６の内端部外周面で、前記第二の内輪軌道９から外れた部分には、被検知部としてのエンコーダ１９を外嵌固定している。
このエンコーダ１９は、支持環２０と永久磁石２１とで構成されている。
支持環２０は、ＳＰＣＣ等の磁性金属板を折り曲げる事により、断面Ｔ字形で全体を円環状に形成し、前記内輪構成部材６の内端部外周面にしまりばめで外嵌固定している。
前記永久磁石２１は、例えばフェライト粉末を混入したゴムを、前記支持環２０を構成する円輪部の内側面に、焼き付け等により添着して成る。永久磁石２１は、例えば内輪構成部材６の回転軸方向に着磁すると共に、着磁方向を円周方向にわたり交互に且つ等間隔で変化させている。従って、前記エンコーダ１９の内側面には、Ｓ極とＮ極とが円周方向にわたり交互に且つ等間隔で配置されている。 On the outer peripheral surface of the inner end portion of the inner ring constituent member 6, an encoder 19 as a detected portion is externally fitted and fixed to a portion deviated from the second inner ring raceway 9.
The encoder 19 includes a support ring 20 and a permanent magnet 21.
The support ring 20 is formed by bending a magnetic metal plate such as SPCC to form a circular shape as a whole with a T-shaped cross section, and is fitted and fixed on the outer peripheral surface of the inner end portion of the inner ring component member 6 with an interference fit.
The permanent magnet 21 is formed, for example, by adhering rubber mixed with ferrite powder to the inner surface of an annular portion constituting the support ring 20 by baking or the like. For example, the permanent magnet 21 is magnetized in the direction of the rotation axis of the inner ring component 6 and the magnetization direction is changed alternately and at equal intervals over the circumferential direction. Accordingly, on the inner side surface of the encoder 19, S poles and N poles are alternately arranged at equal intervals in the circumferential direction.

前記カバー部１６を構成する本体１７は、前記エンコーダ１９を構成する永久磁石２１の内側面（センサ素子２８との対峙面）と対向する部分に、表裏面に貫通した通孔２２が設けられている。そして、この通孔２２を介して検知部としてのセンサ部２３を一体化している。   The body 17 constituting the cover portion 16 is provided with a through hole 22 penetrating the front and back surfaces in a portion facing the inner side surface (opposite surface to the sensor element 28) of the permanent magnet 21 constituting the encoder 19. Yes. And the sensor part 23 as a detection part is integrated through this through-hole 22.

センサ部２３は、一端を開放した開口穴部２４を有するとともに、開口穴部２４の穴内底面（特許文献１及び２ではフランジ部の内縁部という。）２５の中心部分に他端へと続く連通路２６を設けた合成樹脂製のコネクタ２７を形成し、そして、前記連通路２６を、カバー部１６の通孔２２と同軸上に配してカバー部１６の表面１６ａにコネクタ２７を位置させ、センサ素子２８をカバー部１６の裏面１６ｂ方向の所定位置に位置させ、及びセンサ素子２８と電気的に接続された端子２９をコネクタ２７の開口穴部２４内に位置させて、合成樹脂でモールド成形している。そして、このモールド成形された合成樹脂部は、カバー部１６の裏面１６ｂ側でセンサ素子２８を被覆した合成樹脂部分３０ａと、連通路２６内に入り込んだ合成樹脂部分３０ｂと、前記通孔２２と連通路２６を介してコネクタ２７の開口穴部２４内に入り込んで端子２９を突出させて支持している合成樹脂部分３０ｃとからなり、コネクタ２７内に入り込んだ合成樹脂部分３０ｃが、コネクタ２７の穴内底面２５と噛み合うように構成されている。   The sensor portion 23 has an opening hole portion 24 with one end open, and continues to the other end at the center portion of the hole bottom surface (referred to as the inner edge portion of the flange portion in Patent Documents 1 and 2) 25 of the opening hole portion 24. A connector 27 made of synthetic resin provided with a passage 26 is formed, and the communication passage 26 is arranged coaxially with the through hole 22 of the cover portion 16 so that the connector 27 is positioned on the surface 16a of the cover portion 16, The sensor element 28 is positioned at a predetermined position in the direction of the back surface 16b of the cover portion 16, and the terminal 29 electrically connected to the sensor element 28 is positioned in the opening hole 24 of the connector 27, and is molded with synthetic resin. doing. The molded synthetic resin portion includes a synthetic resin portion 30 a that covers the sensor element 28 on the back surface 16 b side of the cover portion 16, a synthetic resin portion 30 b that enters the communication path 26, and the through hole 22. The synthetic resin portion 30c is inserted into the opening hole 24 of the connector 27 through the communication passage 26 and supports the terminal 29 by projecting. The synthetic resin portion 30c that has entered the connector 27 is It is configured to mesh with the bottom surface 25 in the hole.

上述の様な回転速度検出装置付きの転がり軸受ユニットの使用時には、前記外輪構成部材４の外周面に固設した第二のフランジ１３を懸架装置に対して、図示しないボルトにより結合固定すると共に、前記ハブ５の外周面に設けた第一のフランジ７にスタッド３１で車輪を固定する事により、前記懸架装置に対して前記車輪を回転自在に支持する。この状態で車輪が回転すると、前記センサ部２３のセンサ素子２８の端面近傍を、前記被検知部としての永久磁石２１の内側面に存在するＮ極とＳ極とが交互に通過する。この結果、前記センサ部２３内を流れる磁束の方向が変化し、このセンサ部２３の出力が変化する。この様にしてセンサ部２３の出力が変化する周波数は、前記車輪の回転数に比例する。従って、前記センサ部２３の出力を図示しない制御器に送れば、ＡＢＳやＴＣＳを適切に制御できる。   When using the rolling bearing unit with the rotational speed detection device as described above, the second flange 13 fixed to the outer peripheral surface of the outer ring constituent member 4 is coupled and fixed to the suspension device with a bolt (not shown), By fixing the wheel with the stud 31 to the first flange 7 provided on the outer peripheral surface of the hub 5, the wheel is rotatably supported with respect to the suspension device. When the wheel rotates in this state, the N pole and the S pole existing on the inner surface of the permanent magnet 21 as the detected part alternately pass through the vicinity of the end face of the sensor element 28 of the sensor part 23. As a result, the direction of the magnetic flux flowing through the sensor unit 23 changes, and the output of the sensor unit 23 changes. The frequency at which the output of the sensor unit 23 changes in this way is proportional to the rotational speed of the wheel. Therefore, if the output of the sensor unit 23 is sent to a controller (not shown), the ABS and TCS can be appropriately controlled.

しかし、このような特許文献１及び２に開示の先行技術であっては、次のような解決課題を有していた。   However, the prior arts disclosed in Patent Documents 1 and 2 have the following problems to be solved.

すなわち、
（１）コネクタ２７をカバー部１６と一体にモールド成形する際の合成樹脂部分の容積を少なくすることで合成樹脂部分の冷却時間を減少させることを目的としたものであり、一体化した際のコネクタ２７とカバー部１６との合わせ面における浸水防止を何等考慮に入れているものではない。すなわち、モールディングした合成樹脂部の凝縮力によって、コネクタ２７とカバー部１６とが一体化されるが、コネクタ２７の開口穴部２４の穴内底面２５とカバー部１６とが回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中Ｔで示す方向）で重なり合う位置にない（図５）ため、コネクタ２７の開口穴部２４内に入り込んだ合成樹脂部分のカバー部１６に掛かる押圧力が極めて弱い。従って、コネクタ２７とカバー部１６との間（合わせ面）にかかる凝縮力による押圧力が極めて弱いものであったため、この合わせ面からの軸受内への浸水が懸念される。
（２）特許文献１及び２では、カバー部１６の裏面１６ｂ側にモールド成形された合成樹脂部分３０ａの側端面３２が、嵌め合い部３３の内面３３ａに密着（あるいは溶着）されていた。カバー部１６の嵌め合い部３３を外輪構成部材４の一端の内面に嵌め込む際には、その嵌め込み完了状態を水密状とするため、その嵌め込み時には多大な圧力が掛かり、その圧力によってカバー部１６の裏面１６ｂ側の合成樹脂部分３０ａが変形し、カバー部１６とコネクタ２７との間（合わせ面）の押圧力が不均一となる虞が考えられる。また、その変形が著しい場合には、カバー部１６とコネクタ２７との間（合わせ面）に隙間があいてしまうことも考えられる。このような虞を有していることを考えると、カバー部１６とコネクタ２７との間（合わせ面）からの軸受内へのさらなる浸水が懸念される。 That is,
(1) The purpose is to reduce the cooling time of the synthetic resin portion by reducing the volume of the synthetic resin portion when the connector 27 is molded integrally with the cover portion 16. This does not take into account the prevention of water infiltration at the mating surface of the connector 27 and the cover portion 16. That is, the connector 27 and the cover portion 16 are integrated by the condensing force of the molded synthetic resin portion, but the inner bottom surface 25 of the opening hole portion 24 of the connector 27 and the cover portion 16 are connected to the rotating wheel (the hub 5 and the inner ring). Since there is no overlapping position in the rotation axis direction (direction indicated by T in the drawing) of the component member 6) (FIG. 5), the pressing force applied to the cover portion 16 of the synthetic resin portion that has entered the opening hole portion 24 of the connector 27 is reduced. Very weak. Therefore, since the pressing force due to the condensing force applied between the connector 27 and the cover portion 16 (mating surface) is extremely weak, there is a concern that water may enter the bearing from the mating surface.
(2) In Patent Documents 1 and 2, the side end surface 32 of the synthetic resin portion 30 a molded on the back surface 16 b side of the cover portion 16 is closely attached (or welded) to the inner surface 33 a of the fitting portion 33. When the fitting portion 33 of the cover portion 16 is fitted into the inner surface of one end of the outer ring constituent member 4, the fitting completion state is made watertight, so a great amount of pressure is applied at the time of fitting, and the pressure is applied to the cover portion 16. There is a possibility that the synthetic resin portion 30a on the back surface 16b side is deformed, and the pressing force between the cover portion 16 and the connector 27 (mating surface) becomes non-uniform. In addition, when the deformation is significant, there may be a gap between the cover portion 16 and the connector 27 (mating surface). Considering that there is such a concern, there is a concern about further water immersion into the bearing from between the cover portion 16 and the connector 27 (mating surface).

特開２００６−１２５５９６号公報JP 2006-125596 A 特開２００６−１２６１１８号公報JP 2006-126118 A

本発明は、このような問題を解決するためになされており、その目的は、コネクタとカバー部が合成樹脂のモールド成形よって一体化されてなる場合において、コネクタとカバー部との合わせ面からの軸受内への浸水を防止し得る耐水性の高い車輪用軸受ユニットを提供することにある。   The present invention has been made in order to solve such a problem, and the object is to provide a connector and a cover portion from a mating surface when the connector and the cover portion are integrated by molding a synthetic resin. An object of the present invention is to provide a wheel bearing unit with high water resistance that can prevent water from entering the bearing.

この目的を達成するために、本発明の第１の発明は、車体側ハウジングに固定されて常時非回転状態に維持される静止輪と、
静止輪の内側に対向して設けられ、かつ車輪に接続されて共に回転する回転輪と、
静止輪と回転輪との間に回転可能に組み込まれた複数の転動体と、
回転輪の一端に備えた被検知部と、
静止輪の一端に備えられ、表裏面を貫通する通孔を所定位置に設けたカバー部と、
一端を開放した開口穴部と、開口穴部と連通して他端に貫通した連通路を有するコネクタと、カバー部の裏面側で被検知部と対峙して非接触に配されるセンサ素子と、センサ素子と電気的に接続された端子とで構成されるセンサ部とを含み、
カバー部とセンサ部とが、モールド成形により、カバー部の裏面とコネクタの開口穴部内にわたって一体に設けられた合成樹脂部によって一体化されてなる車輪用軸受ユニットであって、
合成樹脂部は、カバー部の裏面側に設けられてセンサ素子を一体に備えたカバー部裏面側樹脂部と、カバー部裏面側樹脂部と一体でコネクタの連通路内に設けられた連絡樹脂部と、連絡樹脂部と一体でコネクタの開口穴部内に設けられて端子を開口穴部内に突出状に備えた穴部内樹脂部とで構成され、
カバー部の通孔周縁とコネクタの開口穴部の穴内底面とは、回転輪の回転軸方向で重なり合う領域を有し、かつ合成樹脂部のカバー部裏面側樹脂部と穴部内樹脂部とで回転輪の回転軸方向から挟み込まれ、合成樹脂部の凝縮時の凝縮力で、カバー部裏面側樹脂部と穴部内樹脂部とによって押圧されることにより、コネクタとカバー部との合わせ面に水密状の浸水防止領域が形成されていることを特徴とする車輪用軸受ユニットとしたことである。 In order to achieve this object, the first invention of the present invention is a stationary wheel fixed to the vehicle body side housing and maintained in a non-rotating state at all times,
A rotating wheel provided facing the inside of the stationary wheel and connected to the wheel and rotating together;
A plurality of rolling elements rotatably incorporated between the stationary wheel and the rotating wheel;
A detected part provided at one end of the rotating wheel;
A cover portion provided at one end of the stationary ring, and provided with a through-hole penetrating the front and back surfaces at a predetermined position;
An opening hole portion having one end opened, a connector having a communication path communicating with the opening hole portion and penetrating the other end, and a sensor element disposed in a non-contact manner facing the detected portion on the back side of the cover portion; Including a sensor unit composed of terminals electrically connected to the sensor element,
A cover unit and a sensor unit are wheel bearing units that are integrated by a synthetic resin unit that is integrally provided across the back surface of the cover unit and the opening hole of the connector by molding,
The synthetic resin part is provided on the back side of the cover part, and the cover part back side resin part integrally provided with the sensor element, and the connecting resin part provided in the communication path of the connector integrally with the cover part back side resin part And a resin part in the hole provided integrally with the connecting resin part in the opening hole of the connector and provided with a terminal protruding into the opening hole,
The through-hole periphery of the cover part and the inner bottom surface of the opening hole part of the connector have a region that overlaps in the rotation axis direction of the rotating wheel, and the cover part back side resin part of the synthetic resin part and the resin part in the hole part rotate. It is sandwiched from the direction of the rotation axis of the wheel, and the condensing force at the time of condensation of the synthetic resin part is pressed by the cover part back side resin part and the resin part in the hole part, so that the mating surface of the connector and cover part is watertight This is a wheel bearing unit characterized in that an infiltration prevention region is formed.

本発明の第２の発明は、第１の発明において、コネクタの他端には、カバー部の通孔内に嵌め込まれる突出部を有し、
連通路は、突出部の端部にわたって貫通しており、
穴内底面の最大径は、突出部の外径よりも大径に形成されていることを特徴とする車輪用軸受ユニットとしたことである。 According to a second aspect of the present invention, in the first aspect, the other end of the connector has a protruding portion that is fitted into the through hole of the cover portion.
The communication path extends through the end of the protrusion,
The maximum diameter of the bottom surface in the hole is that the wheel bearing unit is characterized in that it has a larger diameter than the outer diameter of the protrusion.

本発明の第３の発明は、第１又は第２の発明において、カバー部の通孔周縁には凹凸部が形成されて浸水防止領域が構成されていることを特徴とする車輪用軸受ユニットとしたことである。   According to a third aspect of the present invention, there is provided the wheel bearing unit according to the first or second aspect, wherein an unevenness portion is formed on a peripheral edge of the through hole of the cover portion to form a flood prevention region. It is that.

本発明の第４の発明は、第３の発明において、凹凸部は、カバー部の通孔と同心円状に設けられていることを特徴とする車輪用軸受ユニットとしたことである。   A fourth invention of the present invention is the wheel bearing unit according to the third invention, wherein the uneven portion is provided concentrically with the through hole of the cover portion.

本発明の第５の発明は、第１乃至第４のいずれかの発明において、カバー部は、静止輪の一端の内面に嵌まる嵌め合い部を含み、
嵌め合い部の内面と、カバー部裏面側樹脂部の側端面との間に、所定の隙間を設けたことを特徴とする車輪用軸受ユニットとしたことである。 According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the cover portion includes a fitting portion that fits on the inner surface of one end of the stationary ring,
The wheel bearing unit is characterized in that a predetermined gap is provided between the inner surface of the fitting portion and the side end surface of the cover portion rear surface side resin portion.

本発明によれば、コネクタとカバー部が合成樹脂のモールド成形よって一体化されてなる場合において、コネクタとカバー部との合わせ面からの軸受内への浸水を防止し得る耐水性の高い車輪用軸受ユニットを提供できる。
すなわち、カバー部の通孔周縁とコネクタの開口穴部の穴内底面とが回転輪の回転軸方向で重なり合う領域を有し、かつ合成樹脂部のカバー部裏面側樹脂部と穴部内樹脂部とで回転輪の回転軸方向から挟み込んでいる構造を有していることから、合成樹脂部の凝縮時の凝縮力が、カバー部裏面側樹脂部と穴部内樹脂部とによってカバー部を直接押圧する。これにより、コネクタとカバー部との合わせ面に水密状の浸水防止領域が形成されるため、コネクタとカバー部との合わせ面からの軸受内への浸水が確実に防止できる。
また、カバー部が、静止輪の一端の内面に水密状に嵌まる嵌め合い部を有している場合であっても、嵌め合い部の内面とカバー部裏面側樹脂部の側端面との間に所定の隙間を設けた構造を有しているため、カバー部を静止輪の一端に嵌め込む際に多大な圧力が掛かったとしても、その嵌め込み時の圧力が、前記隙間によってカバー部の裏面側の合成樹脂部分には及ばない。よって、嵌め込んだ後も、カバー部裏面側樹脂部と穴部内樹脂部とによるカバー部への押圧作用が変化しないため、コネクタとカバー部との合わせ面に形成される水密状の浸水防止領域が維持される。 According to the present invention, in the case where the connector and the cover part are integrated by molding of a synthetic resin, for a wheel with high water resistance that can prevent water from entering the bearing from the mating surface of the connector and the cover part. A bearing unit can be provided.
That is, there is a region where the peripheral edge of the through hole of the cover portion and the bottom surface of the hole of the opening portion of the connector overlap in the direction of the rotation axis of the rotating wheel, and the resin portion of the cover portion back surface side of the synthetic resin portion and the resin portion in the hole portion Since it has a structure sandwiched from the rotation axis direction of the rotating wheel, the condensing force at the time of condensation of the synthetic resin portion directly presses the cover portion by the cover portion back surface side resin portion and the resin portion in the hole portion. Thereby, since a watertight infiltration prevention region is formed on the mating surface of the connector and the cover portion, it is possible to reliably prevent water from entering the bearing from the mating surface of the connector and the cover portion.
Further, even when the cover portion has a fitting portion that fits in a watertight manner on the inner surface of one end of the stationary ring, the gap between the inner surface of the fitting portion and the side end surface of the cover portion rear surface side resin portion. Even if a large amount of pressure is applied when the cover portion is fitted to one end of the stationary ring, the pressure at the time of fitting is applied to the back surface of the cover portion by the gap. It does not reach the synthetic resin part on the side. Therefore, even after the fitting, the pressing action on the cover part by the resin part on the back side of the cover part and the resin part in the hole part does not change, so that a watertight infiltration prevention region formed on the mating surface of the connector and the cover part Is maintained.

ハブユニット軸受に本発明を適用した実施の一形態を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows one Embodiment which applied this invention to the hub unit bearing. 本発明の要部を拡大して示す縦断面図である。It is a longitudinal cross-sectional view which expands and shows the principal part of this invention. カバー部の他の実施形態を示す平面図である。It is a top view which shows other embodiment of a cover part. 図３に示すカバー部の要部を拡大して示す断面図である。It is sectional drawing which expands and shows the principal part of the cover part shown in FIG. 従来の回転速度検出装置付きの車輪用軸受ユニットの概略縦断面図である。It is a schematic longitudinal cross-sectional view of the wheel bearing unit with the conventional rotational speed detection apparatus.

以下、本発明の車輪用軸受ユニットについて、その実施形態毎に添付図面を参照して説明する。なお、本実施形態は、本発明の一実施形態であって、何等これらに限定解釈されるものではなく本発明の範囲内で設計変更可能である。
以下、本明細書の実施例では、ハブユニット軸受に本発明を適用した実施の一形態をもって説明する。 Hereinafter, the wheel bearing unit of the present invention will be described for each embodiment with reference to the accompanying drawings. Note that this embodiment is an embodiment of the present invention, and is not construed as being limited thereto, and can be modified within the scope of the present invention.
Hereinafter, in the examples of the present specification, an embodiment in which the present invention is applied to a hub unit bearing will be described.

図１は、本発明を適用した回転速度検出装置付きのハブユニット軸受の概略縦断面図であって、車体側ハウジングに固定されて常時非回転状態に維持される静止輪（外輪構成部材４）と、静止輪（外輪構成部材４）の内側に対向して設けられ、かつ車輪に接続されて共に回転する回転輪（ハブ５と内輪構成部材６）と、静止輪（外輪構成部材４）と回転輪（ハブ５と内輪構成部材６）との間に回転可能に組み込まれた複数の転動体（玉）１４とで構成され、静止輪（外輪構成部材４）の一端にセンサ付きのカバー部（エンドキャップともいう。）１６を水密状に一体に備えている。
なお、本実施形態は、図５に示した従来の回転速度検出装置付きの車輪用軸受ユニットの改良であるため、以下では、改良部分の説明にとどめる。この場合、図５の従来構造と同一の構成については、その構成に付された参照符号と同一の符号を本実施形態に用いた図面上に付すことで、その説明を省略する。 FIG. 1 is a schematic longitudinal sectional view of a hub unit bearing with a rotational speed detection device to which the present invention is applied, and is a stationary wheel (outer ring constituent member 4) that is fixed to a vehicle body side housing and maintained in a non-rotating state at all times. A rotating wheel (hub 5 and inner ring component member 6) that is provided opposite to the inside of the stationary wheel (outer ring component member 4) and rotates together with the wheel, and a stationary wheel (outer ring component member 4); A cover portion with a sensor at one end of a stationary wheel (outer ring component 4), which is composed of a plurality of rolling elements (balls) 14 rotatably incorporated between a rotating wheel (hub 5 and inner ring component 6). (Also referred to as an end cap) 16 is integrally provided in a watertight manner.
In addition, since this embodiment is an improvement of the conventional wheel bearing unit with a rotational speed detection device shown in FIG. 5, only the improved part will be described below. In this case, about the same structure as the conventional structure of FIG. 5, the description is abbreviate | omitted by attaching | subjecting the code | symbol same as the reference mark attached | subjected to the structure on drawing used in this embodiment.

カバー部１６に一体に備えられるセンサ部２３は、合成樹脂材で別途形成されたコネクタ２７と、カバー部１６の裏面１６ｂ側で被検知部と対峙して非接触に配されるセンサ素子２８と、センサ素子２８と電気的に接続され、コネクタ２７の開口穴部２４内で突出して配される端子２９とで構成されている。   The sensor part 23 provided integrally with the cover part 16 includes a connector 27 separately formed of a synthetic resin material, and a sensor element 28 arranged in a non-contact manner facing the detected part on the back surface 16b side of the cover part 16. And a terminal 29 that is electrically connected to the sensor element 28 and that protrudes from the opening hole 24 of the connector 27.

コネクタ２７は、一端を開放した開口穴部２４を有する円筒状の接続筒部３４と、接続筒部３４の下端側にて接続筒部３４の外径よりも大径に外方に張り出して一体に形成されている円筒状のフランジ筒部３５と、フランジ筒部の底面３５ａ（コネクタ２７の他端）にて突出して設けられ、カバー部１６の通孔２２内に嵌め込まれる円筒状の突出部３６とで構成され、開口穴部２４の穴内底面２５から突出部３６の他端にわたって貫通した円筒状の連通路２６を有している。   The connector 27 includes a cylindrical connection tube portion 34 having an opening hole 24 with one end open, and an outer portion that projects outwardly to a larger diameter than the outer diameter of the connection tube portion 34 on the lower end side of the connection tube portion 34. A cylindrical flange tube portion 35 formed on the bottom surface 35a of the flange portion and a bottom surface 35a of the flange tube portion (the other end of the connector 27). The cylindrical protrusion portion is fitted into the through hole 22 of the cover portion 16. 36 and has a cylindrical communication passage 26 penetrating from the inner bottom surface 25 of the opening hole 24 to the other end of the protrusion 36.

接続筒部３４の開口穴部２４は、その穴内底面２５の最大径Ｒ１が突出部３６の外径Ｒ２よりも大径に形成されている（図２参照。）。
突出部３６は、カバー部１６の通孔２２に水密状に嵌り合う外径とした短尺円筒状に形成されている。この突出部３６を有していることから、モールド成形時の位置決めが容易となる。 The opening hole portion 24 of the connecting cylinder portion 34 is formed such that the maximum diameter R1 of the bottom surface 25 in the hole is larger than the outer diameter R2 of the protruding portion 36 (see FIG. 2).
The protruding portion 36 is formed in a short cylindrical shape having an outer diameter that fits into the through hole 22 of the cover portion 16 in a watertight manner. Since it has this protrusion part 36, the positioning at the time of molding becomes easy.

カバー部１６とセンサ部２３は、モールド成形により、カバー部１６の裏面１６ｂとコネクタ２７の接続筒部３４の開口穴部２４内にわたって一体に設けられた合成樹脂部によって一体化されている（図２参照。）。   The cover part 16 and the sensor part 23 are integrated by a synthetic resin part integrally provided over the back surface 16b of the cover part 16 and the opening hole part 24 of the connection cylinder part 34 of the connector 27 by molding (FIG. 2).

合成樹脂部は、カバー部１６の裏面１６ｂ側に設けられてセンサ素子２８を一体に備えたカバー部裏面側樹脂部３０ａと、カバー部裏面側樹脂部３０ａと一体でコネクタ２７の連通路２６内に設けられた連絡樹脂部３０ｂと、連絡樹脂部３０ｂと一体でコネクタ２７の接続筒部３４の開口穴部２４内に設けられて端子２９を開口穴部２４内に突出状に備えた穴部内樹脂部３０ｃとで構成されている（図２参照。）。
なお、合成樹脂部（カバー部裏面側樹脂部３０ａ、連絡樹脂部３０ｂ、穴部内樹脂部３０ｃ）は、コネクタ２７よりも低融点の樹脂であるが、本発明の範囲内で設計変更可能である。 The synthetic resin portion is provided on the back surface 16b side of the cover portion 16 and includes a cover portion back surface side resin portion 30a integrally provided with the sensor element 28, and the cover portion back surface side resin portion 30a is integrated with the inside of the communication path 26 of the connector 27. A connecting resin portion 30b provided in the connecting hole, and in the opening hole portion 24 of the connecting tube portion 34 of the connector 27 which is integrated with the connecting resin portion 30b so that the terminal 29 protrudes into the opening hole portion 24. It is comprised by the resin part 30c (refer FIG. 2).
The synthetic resin portion (cover portion back surface side resin portion 30a, connecting resin portion 30b, and in-hole resin portion 30c) is a resin having a melting point lower than that of the connector 27, but the design can be changed within the scope of the present invention. .

カバー部裏面側樹脂部３０ａは、カバー部１６の裏面１６ｂ側の通孔周縁１６ｃに一体に設けられ、所定の肉厚を有する中実の短尺円柱状に形成されてセンサ素子２８とコンデンサ３７を被覆して備えている。なお、センサ素子２８の検出面（被検知部としての永久磁石２１と対峙する面部）は樹脂部で覆われていない。
カバー部裏面側樹脂部３０ａは、コネクタ２７よりも大径に形成されており、本実施例では、コネクタ２７よりも径方向に長く設けられている（図２参照。）。
カバー部１６の嵌め合い部３３の内面３３ａと対峙するカバー部裏面側樹脂部３０ａの側端面３２は、カバー部１６の嵌め合い部３３の内面３３ａと所定の隙間Ｓをあけて非接触状態となっている（図２参照。）。 The cover portion back surface side resin portion 30a is provided integrally with the through hole peripheral edge 16c on the back surface 16b side of the cover portion 16, and is formed in a solid short columnar shape having a predetermined thickness to connect the sensor element 28 and the capacitor 37. It is provided with a cover. In addition, the detection surface (surface part which opposes the permanent magnet 21 as a to-be-detected part) of the sensor element 28 is not covered with the resin part.
The cover part back surface side resin part 30a is formed to have a larger diameter than the connector 27, and in this embodiment, is provided longer in the radial direction than the connector 27 (see FIG. 2).
The side end surface 32 of the cover portion back surface side resin portion 30a facing the inner surface 33a of the fitting portion 33 of the cover portion 16 is not in contact with the inner surface 33a of the fitting portion 33 of the cover portion 16 with a predetermined gap S therebetween. (See FIG. 2).

穴部内樹脂部３０ｃは、カバー部裏面側樹脂部３０ａと一体で連通路２６内に入り込んでいる中実の連絡樹脂部３０ｂの他端側で、接続筒部３４の開口穴部２４内に入り込んで中実の短尺円柱状に一体に形成されている。この穴部内樹脂部３０ｃは、その端面略中央に、前記端子２９が開口穴部２４内に突出するように支持している。そして、この穴部内樹脂部３０ｃは、穴内底面２５の全域を覆うように配されている。   The in-hole resin part 30c enters the opening hole part 24 of the connecting cylinder part 34 on the other end side of the solid communication resin part 30b that is integrated with the cover part back surface side resin part 30a and enters the communication path 26. It is integrally formed in a solid short columnar shape. The in-hole resin part 30c is supported so that the terminal 29 protrudes into the opening hole 24 at the center of the end face. And this resin part 30c in a hole part is distribute | arranged so that the whole region of the bottom face 25 in a hole may be covered.

本実施例によれば、図２に示すように、カバー部１６の通孔周縁１６ｃとコネクタ２７の接続筒部３４の開口穴部２４の穴内底面２５とが回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中矢印Ｔで示す方向）で重なり合う領域Ａ１を有し、かつ合成樹脂部のカバー部裏面側樹脂部３０ａと穴部内樹脂部３０ｃとで回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中矢印Ｔで示す方向）から挟み込んでいる構造を有していることとなる。
すなわち、穴部内樹脂部３０ｃと、コネクタ２７の接続筒部３４の穴内底面２５及びフランジ筒部３５の底面３５ａと、カバー部１６の通孔周縁１６ｃと、カバー部裏面側樹脂部３０ａとが、回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中矢印Ｔで示す方向）で重なり合っている（図２参照。）。
このような構成を採用しているため、合成樹脂部（カバー部裏面側樹脂部３０ａと連絡樹脂部３０ｂと穴部内樹脂部３０ｃ）の凝縮時の凝縮力（図中矢印Ｇで示す方向の力）は、穴部内樹脂部３０ｃとカバー部裏面側樹脂部３０ａとによって、穴内底面２５の全域とカバー部１６の裏面１６ｂ側に掛かり、カバー部１６を回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中矢印Ｔで示す方向）から挟み込むように直接押圧することになる。
これにより、コネクタ２７とカバー部１６との合わせ面（重なり合う領域Ａ１に存する面部）に水密状の浸水防止領域Ａ２が形成されるため、コネクタ２７とカバー部１６との合わせ面からの軸受内への浸水が確実に防止できる。 According to the present embodiment, as shown in FIG. 2, the through hole peripheral edge 16 c of the cover portion 16 and the inner bottom surface 25 of the opening hole portion 24 of the connecting tube portion 34 of the connector 27 are connected to the rotating wheel (the hub 5 and the inner ring constituent member). 6) having a region A1 that overlaps in the direction of the rotation axis (the direction indicated by the arrow T in the figure), and a rotating wheel (the hub 5 and the inner ring) by the cover portion back surface side resin portion 30a and the hole inner resin portion 30c of the synthetic resin portion. The component member 6) has a structure sandwiched from the rotation axis direction (direction indicated by arrow T in the figure).
That is, the resin part 30c in the hole part, the bottom face 25a of the connecting cylinder part 34 of the connector 27 and the bottom face 35a of the flange cylinder part 35, the through-hole peripheral edge 16c of the cover part 16, and the cover part back surface side resin part 30a, It overlaps in the rotation axis direction (direction shown by arrow T in the figure) of the rotating wheels (hub 5 and inner ring constituting member 6) (see FIG. 2).
Since such a configuration is adopted, the condensing force (the force in the direction indicated by the arrow G in the figure) at the time of condensation of the synthetic resin portion (the back portion resin portion 30a of the cover portion, the connecting resin portion 30b, and the in-hole resin portion 30c). ) Is hung on the entire bottom surface 25 in the hole and the back surface 16b side of the cover portion 16 by the resin portion 30c in the hole portion and the resin portion 30a on the back surface side of the cover portion, and the cover portion 16 is rotated by the rotating wheel (hub 5 and inner ring component 6). Is directly pressed so as to be sandwiched from the direction of the rotation axis (direction indicated by arrow T in the figure).
As a result, a watertight infiltration prevention region A2 is formed on the mating surface of the connector 27 and the cover portion 16 (the surface portion existing in the overlapping region A1), so that the bearing 27 from the mating surface of the connector 27 and the cover portion 16 enters the bearing. Can be reliably prevented.

また、カバー部１６の嵌め合い部３３の内面３３ａと、カバー部裏面側樹脂部３０ａの側端面３２との間に所定の隙間Ｓを設けた構造を有しているため、カバー部１６を外輪構成部材４の一端に嵌め込む際に多大な圧力が掛かったとしても、その嵌め込み時の圧力が、前記隙間Ｓによってカバー部１６の裏面１６ｂ側のカバー部裏面側樹脂部３０ａには及ばない。よって、嵌め込んだ後も、カバー部裏面側樹脂部３０ａと穴部内樹脂部３０ｃとによるカバー部１６への押圧作用が変化しないため、コネクタ２７とカバー部１６との合わせ面に形成される水密状の浸水防止領域Ａ２が維持される。
なお、隙間Ｓは、カバー部１６を外輪構成部材４の一端に嵌め込む際に掛かる圧力が、カバー部裏面側樹脂部３０ａに及ばない程度の間隔をもって形成されていればよく、本発明の範囲内で設計変更可能である。 Moreover, since it has the structure which provided the predetermined clearance S between the inner surface 33a of the fitting part 33 of the cover part 16, and the side end surface 32 of the cover part back surface side resin part 30a, the cover part 16 is attached to the outer ring. Even if a great deal of pressure is applied when fitting into one end of the component member 4, the pressure at the time of fitting does not reach the cover portion back surface side resin portion 30 a on the back surface 16 b side of the cover portion 16 due to the gap S. Therefore, even after the fitting, the pressing action on the cover part 16 by the cover part back surface side resin part 30a and the resin part 30c in the hole part does not change, so the watertightness formed on the mating surface of the connector 27 and the cover part 16 The water-infiltration prevention area A2 is maintained.
In addition, the clearance gap S should just be formed with the space | interval of the grade which the pressure applied when fitting the cover part 16 in the end of the outer ring | wheel structural member 4 does not reach the cover part back surface side resin part 30a, and the range of this invention The design can be changed within.

図３及び図４は、本発明の実施例２で、カバー部１６の改良に関する。
本実施例では、コネクタ２７のフランジ筒部３５の底面３５ａと接するカバー部１６の外面領域、特に穴内底面２５と回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中矢印Ｔで示す方向）で重なり合うカバー部１６の通孔周縁１６ｃの外面領域に複数個の凹凸部３８が形成されている。 3 and 4 relate to the improvement of the cover portion 16 according to the second embodiment of the present invention.
In the present embodiment, the outer surface area of the cover portion 16 in contact with the bottom surface 35a of the flange cylindrical portion 35 of the connector 27, in particular, the inner bottom surface 25 and the rotation axis direction (the arrow T in the figure) of the rotating wheel (the hub 5 and the inner ring constituting member 6). A plurality of concavo-convex portions 38 are formed in the outer surface region of the through-hole periphery 16c of the cover portion 16 that overlaps in the direction shown in FIG.

従って、凹凸部３８とコネクタ２７のフランジ筒部３５の底面３５ａとが、上述した合成樹脂部（カバー部裏面側樹脂部３０ａと連絡樹脂部３０ｂと穴部内樹脂部３０ｃ）の凝縮時の凝縮力（図中矢印Ｇで示す方向の力）による押圧力で密着することにより浸水防止領域Ａ２が構成されているものである。このように凹凸部３８を設けることにより、押圧力が掛かったときの面圧にピークをもたせることができ、水密性が高くなるため浸水防止効果が高くなる。また、凹凸部３８は、カバー部１６の通孔２２と同心円状でかつ一定の間隔をもって複数個設けると防水効果が高まる。なお、凹凸部３８を同心円状でない形態で設けることを何等妨げるものではない。
その他の構成及び作用効果は実施例１と同じであるためその説明は省略する。
「変形例」 Therefore, the concavity and convexity 38 and the bottom surface 35a of the flange cylindrical portion 35 of the connector 27 cause the condensing force when the above-described synthetic resin portion (the cover portion back surface side resin portion 30a, the contact resin portion 30b, and the in-hole resin portion 30c) is condensed. The inundation prevention region A2 is configured by closely contacting with a pressing force (force in a direction indicated by an arrow G in the figure). By providing the concavo-convex portion 38 in this way, a peak can be given to the surface pressure when a pressing force is applied, and the water-tightness is enhanced, so that the effect of preventing flooding is enhanced. In addition, if a plurality of the concave and convex portions 38 are provided concentrically with the through holes 22 of the cover portion 16 and at regular intervals, the waterproof effect is enhanced. It should be noted that the provision of the concavo-convex portions 38 in a non-concentric form is not hindered.
Since other configurations and operational effects are the same as those of the first embodiment, description thereof is omitted.
"Modification"

特に図示はしないが、次のような変形例であっても本発明特有の作用効果を達成し得るものである。   Although not shown in particular, even the following modifications can achieve the functions and effects unique to the present invention.

凹凸部（前記実施例の凹凸部３８と同一の形状）は、カバー部１６の外面領域と、コネクタ２７のフランジ筒部３５の底面３５ａの双方に設けられ、それぞれの凹凸部同士が、接触時に噛み合うように構成されているものとすることも可能である。
このように構成することで、カバー部１６側の凹凸部とコネクタ２７側の凹凸部とが互いに噛み合うように押圧されて密着するため、複雑なラビリンスも形成され、さらに高い浸水防止効果が得られる。 The uneven portion (the same shape as the uneven portion 38 of the above embodiment) is provided on both the outer surface area of the cover portion 16 and the bottom surface 35a of the flange cylindrical portion 35 of the connector 27. It can also be configured to engage.
By configuring in this manner, the uneven portion on the cover portion 16 side and the uneven portion on the connector 27 side are pressed so as to mesh with each other, so that a complicated labyrinth is formed, and a further high flood prevention effect is obtained. .

上述した各実施例では、コネクタ２７が円筒状に形成された実施の一例をもって説明したが、角筒状など周知のコネクタ形状が本発明の範囲内で適用可能である。
また、突出部３６も円筒状に限らず、カバー部１６の通孔２２の孔形状に合わせて設計変更可能である。 In each of the above-described embodiments, the connector 27 has been described as an example of being formed in a cylindrical shape. However, a well-known connector shape such as a rectangular tube shape is applicable within the scope of the present invention.
Further, the projecting portion 36 is not limited to the cylindrical shape, and the design can be changed according to the shape of the through hole 22 of the cover portion 16.

上述した各実施例では、コネクタ２７の他端に突出部３６を備えた一実施例をもって説明したが、この突出部３６を備えないでコネクタ２７の他端が平坦状の面部（フラット面部）に形成されている場合であっても本発明の範囲内である。
すなわち、このような形態であっても、通孔２２と連通路２６とを同軸状に配してモールド成形可能であればよく、カバー部１６の通孔周縁１６ｃとコネクタ２７の接続筒部３４の開口穴部２４の穴内底面２５とが回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中矢印Ｔで示す方向）で重なり合う領域Ａ１を有し、かつ合成樹脂部のカバー部裏面側樹脂部３０ａと穴部内樹脂部３０ｃとで回転輪（ハブ５及び内輪構成部材６）の回転軸方向（図中矢印Ｔで示す方向）から挟み込んでいる構造を有するため、合成樹脂部の凝縮時の凝縮力（図中矢印Ｇで示す方向の力）は、カバー部裏面側樹脂部３０ａと穴部内樹脂部３０ｃとによってカバー部１６を直接押圧する。よって、本変形例構成であっても、コネクタ２７とカバー部１６との合わせ面に水密状の浸水防止領域Ａ２が形成されるため、コネクタ２７とカバー部１６との合わせ面からの軸受内への浸水が確実に防止できる。 In each of the above-described embodiments, the connector 27 is provided with the protruding portion 36 at the other end, but the other end of the connector 27 has a flat surface portion (flat surface portion) without the protruding portion 36. Even if formed, it is within the scope of the present invention.
That is, even in such a configuration, it is only necessary that the through hole 22 and the communication path 26 are arranged coaxially and can be molded, and the through hole peripheral edge 16c of the cover portion 16 and the connecting tube portion 34 of the connector 27 are sufficient. And a cover portion of the synthetic resin portion that has a region A1 that overlaps with the inner bottom surface 25 of the opening hole portion 24 in the rotation axis direction (direction indicated by arrow T in the drawing) of the rotating wheel (hub 5 and inner ring constituting member 6). Since it has a structure sandwiched from the rotation axis direction (direction indicated by arrow T in the figure) of the rotating wheel (hub 5 and inner ring constituting member 6) between the back surface side resin portion 30a and the hole inner resin portion 30c, the synthetic resin portion The condensing force at the time of condensation (force in the direction indicated by arrow G in the figure) directly presses the cover portion 16 by the cover portion back surface side resin portion 30a and the in-hole resin portion 30c. Therefore, even in this modified example configuration, since the watertight infiltration prevention area A2 is formed on the mating surface between the connector 27 and the cover portion 16, the mating surface between the connector 27 and the cover portion 16 enters the bearing. Can be reliably prevented.

また、上述した他端が平坦状のコネクタを用いる場合、カバー部１６の通孔周縁１６ｃを立ち上げて筒状の突出部を形成し、このカバー部１６側の突出部を、コネクタ２７の連通路２６内に嵌め込む形態を採用することも可能で、このような形態であっても上述した本発明特有の作用効果を同様に達成し得る。   In addition, when a connector having a flat end at the other end is used, a cylindrical projection is formed by raising the peripheral edge 16 c of the cover portion 16, and the projection on the cover portion 16 side is connected to the connector 27. It is also possible to adopt a form that fits into the passage 26, and even with such a form, the above-described operational effects peculiar to the present invention can be similarly achieved.

なお、コネクタ２７とカバー部１６とを合成樹脂で一体にモールド成形する際に、コネクタ２７をカバー部１６に押し付けながらモールディングすると、凝縮力による押圧力が高まり、さらにコネクタ２７とカバー部１６との合わせ面の水密性が高くなり、より一層の浸水防止効果が得られる。   When the connector 27 and the cover portion 16 are molded integrally with a synthetic resin, if the connector 27 is molded while being pressed against the cover portion 16, the pressing force due to the condensing force increases, and the connector 27 and the cover portion 16 are further pressed. The water tightness of the mating surfaces is increased, and a further effect of preventing infiltration is obtained.

２ 軸受ユニット
３ 回転速度検出装置
４ 外輪構成部材（静止輪）
５ ハブ（回転輪）
６ 内輪構成部材（回転輪）
１４ 転動体
１６ カバー部
１６ｂ 裏面
１９ エンコーダ（被検知部）
２２ 通孔
２３ センサ部（検知部）
２４ 開口穴部
２５ 穴内底面
２６ 連通路
２７ コネクタ
２８ センサ素子
２９ 端子
３０ａ カバー部裏面側樹脂部（合成樹脂部）
３０ｂ 連絡樹脂部（合成樹脂部）
３０ｃ 穴部内樹脂部（合成樹脂部）
３２ カバー部裏面側樹脂部の側端面
３３ 嵌め合い部
３３ａ 内面
３４ 接続筒部
３５ フランジ筒部
３６ 突出部
３８ 凹凸部
Ａ１ 重なり合う領域
Ａ２ 浸水防止領域
Ｇ 凝縮力
Ｔ 回転輪の回転軸方向
Ｒ１ 穴内底面の最大径
Ｒ２ 突出部の外径
Ｓ 所定の隙間 2 Bearing unit 3 Rotational speed detection device 4 Outer ring component (stationary ring)
5 Hub (Rotating wheel)
6 Inner ring components (rotating wheels)
14 Rolling body 16 Cover part 16b Back surface 19 Encoder (detected part)
22 Through-hole 23 Sensor part (detection part)
24 Opening hole part 25 Bottom surface in hole 26 Communication path 27 Connector 28 Sensor element 29 Terminal 30a Cover part back surface side resin part (synthetic resin part)
30b Communication resin part (synthetic resin part)
30c Resin part in hole (synthetic resin part)
32 Side end surface 33 of cover portion rear surface side resin portion Fitting portion 33a Inner surface 34 Connection tube portion 35 Flange tube portion 36 Projection portion 38 Concavity and convexity A1 Overlapping region A2 Inundation prevention region G Condensing force T Rotating wheel rotational axis direction R1 Bottom surface in hole Maximum diameter R2 Projecting part outer diameter S Predetermined gap

Claims (5)

車体側ハウジングに固定されて常時非回転状態に維持される静止輪と、
静止輪の内側に対向して設けられ、かつ車輪に接続されて共に回転する回転輪と、
静止輪と回転輪との間に回転可能に組み込まれた複数の転動体と、
回転輪の一端に備えた被検知部と、
静止輪の一端に備えられ、表裏面を貫通する通孔を所定位置に設けたカバー部と、
一端を開放した開口穴部と、開口穴部と連通して他端に貫通した連通路を有するコネクタと、カバー部の裏面側で被検知部と対峙して非接触に配されるセンサ素子と、センサ素子と電気的に接続された端子とで構成されるセンサ部とを含み、
カバー部とセンサ部とが、モールド成形により、カバー部の裏面とコネクタの開口穴部内にわたって一体に設けられた合成樹脂部によって一体化されてなる車輪用軸受ユニットであって、
合成樹脂部は、カバー部の裏面側に設けられてセンサ素子を一体に備えたカバー部裏面側樹脂部と、カバー部裏面側樹脂部と一体でコネクタの連通路内に設けられた連絡樹脂部と、連絡樹脂部と一体でコネクタの開口穴部内に設けられて端子を開口穴部内に突出状に備えた穴部内樹脂部とで構成され、
カバー部の通孔周縁とコネクタの開口穴部の穴内底面とは、回転輪の回転軸方向で重なり合う領域を有し、かつ合成樹脂部のカバー部裏面側樹脂部と穴部内樹脂部とで回転輪の回転軸方向から挟み込まれ、合成樹脂部の凝縮時の凝縮力で、カバー部裏面側樹脂部と穴部内樹脂部とによって押圧されることにより、コネクタとカバー部との合わせ面に水密状の浸水防止領域が形成されていることを特徴とする車輪用軸受ユニット。 A stationary wheel fixed to the vehicle body side housing and maintained in a non-rotating state at all times;
A rotating wheel provided facing the inside of the stationary wheel and connected to the wheel and rotating together;
A plurality of rolling elements rotatably incorporated between the stationary wheel and the rotating wheel;
A detected part provided at one end of the rotating wheel;
A cover portion provided at one end of the stationary ring, and provided with a through-hole penetrating the front and back surfaces at a predetermined position;
An opening hole portion having one end opened, a connector having a communication path communicating with the opening hole portion and penetrating the other end, and a sensor element disposed in a non-contact manner facing the detected portion on the back side of the cover portion; Including a sensor unit composed of terminals electrically connected to the sensor element,
A cover unit and a sensor unit are wheel bearing units that are integrated by a synthetic resin unit that is integrally provided across the back surface of the cover unit and the opening hole of the connector by molding,
The synthetic resin part is provided on the back side of the cover part, and the cover part back side resin part integrally provided with the sensor element, and the connecting resin part provided in the communication path of the connector integrally with the cover part back side resin part And a resin part in the hole provided integrally with the connecting resin part in the opening hole of the connector and provided with a terminal protruding into the opening hole,
The through-hole periphery of the cover part and the inner bottom surface of the opening hole part of the connector have a region that overlaps in the rotation axis direction of the rotating wheel, and the cover part back side resin part of the synthetic resin part and the resin part in the hole part rotate. It is sandwiched from the direction of the rotation axis of the wheel, and the condensing force at the time of condensation of the synthetic resin part is pressed by the cover part back side resin part and the resin part in the hole part, so that the mating surface of the connector and cover part is watertight A bearing unit for a wheel, characterized in that an inundation prevention region is formed. コネクタの他端には、カバー部の通孔内に嵌め込まれる突出部を有し、
連通路は、突出部の端部にわたって貫通しており、
穴内底面の最大径は、突出部の外径よりも大径に形成されていることを特徴とする請求項１に記載の車輪用軸受ユニット。 At the other end of the connector, there is a protruding portion that is fitted into the through hole of the cover portion,
The communication path extends through the end of the protrusion,
The wheel bearing unit according to claim 1, wherein the maximum diameter of the bottom surface in the hole is formed to be larger than the outer diameter of the protruding portion. カバー部の通孔周縁には凹凸部が形成されて浸水防止領域が構成されていることを特徴とする請求項１又は２に記載の車輪用軸受ユニット。   3. The wheel bearing unit according to claim 1, wherein an uneven portion is formed on a peripheral edge of the through hole of the cover portion to constitute a water infiltration prevention region. 4. 凹凸部は、カバー部の通孔と同心円状に設けられていることを特徴とする請求項３に記載の車輪用軸受ユニット。   The wheel bearing unit according to claim 3, wherein the uneven portion is provided concentrically with the through hole of the cover portion. カバー部は、静止輪の一端の内面に嵌まる嵌め合い部を含み、
嵌め合い部の内面と、カバー部裏面側樹脂部の側端面との間に、所定の隙間を設けたことを特徴とする請求項１乃至４のいずれかに記載の車輪用軸受ユニット。 The cover portion includes a fitting portion that fits into the inner surface of one end of the stationary ring,
The wheel bearing unit according to any one of claims 1 to 4, wherein a predetermined gap is provided between an inner surface of the fitting portion and a side end surface of the cover portion rear surface side resin portion.
JP2010028831A 2010-02-12 2010-02-12 Wheel bearing unit Active JP5434647B2 (en)

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