JP4794273B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP4794273B2
JP4794273B2 JP2005311270A JP2005311270A JP4794273B2 JP 4794273 B2 JP4794273 B2 JP 4794273B2 JP 2005311270 A JP2005311270 A JP 2005311270A JP 2005311270 A JP2005311270 A JP 2005311270A JP 4794273 B2 JP4794273 B2 JP 4794273B2
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sensor
insert nut
cap
bearing device
sensor cap
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JP2007120560A (en
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和寿 重岡
実 宝田
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NTN Corp
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Priority to PCT/JP2006/321139 priority patent/WO2007049602A1/en
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
    • G01P3/446—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings mounted between two axially spaced rows of rolling elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolling Contact Bearings (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

この発明は、乗用車、トラック、スポーツ用途ミニバン等の各種自動車における車輪用軸受装置に関し、特に樹脂製のセンサ取付部材を介して回転検出用のセンサを取付けた車輪用軸受装置に関する。   The present invention relates to a wheel bearing device in various automobiles such as passenger cars, trucks, and sports minivans, and more particularly to a wheel bearing device in which a rotation detection sensor is attached via a resin sensor attachment member.

自動車の車輪用軸受装置において、各種の制御、例えばアンチロックブレーキシステム（ＡＢＳ）や、トラクションコントロールシステム（ＴＣＳ）等を制御するために、回転検出装置を設けたものがある。この回転検出装置は、軸受の回転側部材にパルサリングや磁気エンコーダを取付け、固定側部材にセンサを取り付けたものとされる。一般に、従動輪タイプの第３世代車輪用軸受装置の場合、回転速度検出用センサは、ナックルに取付ける場合を別にすれば、特許文献１ないし特許文献３に記載されているように、車輪用軸受装置のインボード側端を閉塞するキャップ（カバー）に取付固定される。   Some wheel bearing devices for automobiles are provided with a rotation detection device in order to control various controls such as an anti-lock brake system (ABS) and a traction control system (TCS). In this rotation detection device, a pulsar ring or a magnetic encoder is attached to the rotation side member of the bearing, and a sensor is attached to the fixed side member. In general, in the case of a driven wheel type third-generation wheel bearing device, the rotation speed detection sensor is a wheel bearing as described in Patent Document 1 to Patent Document 3, except for a case where it is attached to a knuckle. It is attached and fixed to a cap (cover) that closes the inboard side end of the device.

このような車輪用軸受装置の一例を、図５および図６に示す。この車輪用軸受装置は、上記特許文献１に開示されたものと類似するものであり、図５のように車体に取付けられる外方部材５１と、車輪が取付けられる内方部材５２との間に複列の転動体５３を介在させてなる従動輪支持用のハブベアリングである。内方部材５２の構成部品であるインボード側の内輪５４にはパルサリング５５が設けられ、外方部材５１に、そのインボード側端を閉塞する合成樹脂製のセンサキャップ５６が設けられる。   An example of such a wheel bearing device is shown in FIGS. This wheel bearing device is similar to that disclosed in Patent Document 1, and is provided between an outer member 51 attached to the vehicle body and an inner member 52 to which the wheel is attached as shown in FIG. This is a hub bearing for supporting a driven wheel, in which double row rolling elements 53 are interposed. A pulsar ring 55 is provided on the inner ring 54 on the inboard side, which is a component of the inner member 52, and a sensor cap 56 made of synthetic resin is provided on the outer member 51 to close the end of the inboard side.

センサキャップ５６には、パルサリング５５に対して軸方向に対向するようにセンサ５７が配置され、このセンサ５７とパルサリング５５とで回転センサ５８が構成される。図５のＶＩ部を拡大して図６に示す。センサ５７は取付片５９を有し、この取付片５９がセンサキャップ５６の外表面に配置されるように、センサキャップ５６に設けられたセンサ挿入孔６０にセンサ５７が挿入される。取付片５９を、センサ固定ボルト６１でセンサキャップ５６に締め付け固定することにより、センサ５７がセンサキャップ５６に固定される。取付片５９のセンサ固定ボルト６１による締め付け固定は、センサキャップ５６に埋め込まれたインサートナット６２にセンサ固定ボルト６１をねじ込むことにより行われる。   A sensor 57 is disposed on the sensor cap 56 so as to face the pulsar ring 55 in the axial direction. The sensor 57 and the pulsar ring 55 constitute a rotation sensor 58. FIG. 6 is an enlarged view of the VI part of FIG. The sensor 57 has an attachment piece 59, and the sensor 57 is inserted into the sensor insertion hole 60 provided in the sensor cap 56 so that the attachment piece 59 is disposed on the outer surface of the sensor cap 56. The sensor piece 57 is fixed to the sensor cap 56 by fastening and fixing the attachment piece 59 to the sensor cap 56 with the sensor fixing bolt 61. The fastening of the mounting piece 59 with the sensor fixing bolt 61 is performed by screwing the sensor fixing bolt 61 into the insert nut 62 embedded in the sensor cap 56.

特許文献２，３の車輪用軸受装置は、いずれも、センサが車輪用軸受装置のインボード側端を閉塞するキャップに取付固定される点で共通する。
特許３４４０８００号公報 特開平１０−３１１８４６号公報 特開平１０−３１９０２７号公報 The wheel bearing devices of Patent Documents 2 and 3 are common in that the sensor is attached and fixed to a cap that closes the inboard side end of the wheel bearing device.
Japanese Patent No. 3440800 Japanese Patent Laid-Open No. 10-311846 Japanese Patent Laid-Open No. 10-319027

上記のようなセンサキャップ５６の材料として、熱可塑性樹脂の汎用的なエンジニアプラスチックの中のポリアミド（ＰＡ）系樹脂をガラス繊維で強化したＰＡ６６＋ＧＦが一般に使用されている。このプラスチック材料は、融点が高く、耐衝撃性・耐薬品性が良好で、電気特性・低温特性に優れている。しかし、吸水による寸法変化があり、また融雪剤（塩化カルシウム）に対して影響を受けやすく、樹脂表面に微細クラックが発生するため、完全な密封性が期待できないことが判明している。そのため、自動車の車輪用軸受装置のように過酷な環境下で使用される場合には、その使用適性の改良が望まれるところであった。   As a material for the sensor cap 56 as described above, PA66 + GF in which polyamide (PA) resin in a general-purpose engineer plastic of thermoplastic resin is reinforced with glass fiber is generally used. This plastic material has a high melting point, good impact resistance and chemical resistance, and excellent electrical and low temperature characteristics. However, it has been found that there is a dimensional change due to water absorption, and it is easily affected by the snow melting agent (calcium chloride), and fine cracks are generated on the resin surface, so that complete sealing cannot be expected. Therefore, when it is used in a harsh environment such as an automobile wheel bearing device, it is desired to improve its suitability for use.

この発明の目的は、センサ取付部材に低吸水率のプラスチック材料を用いることにより吸水による寸法変化を抑制でき、また融雪剤によるクラックの発生が低減されて密封性を維持し得るセンサ付の車輪用軸受装置を提供することである。   An object of the present invention is for a wheel with a sensor that can suppress a dimensional change due to water absorption by using a plastic material having a low water absorption rate for a sensor mounting member, and can reduce the occurrence of cracks due to a snow melting agent and maintain sealing performance. It is to provide a bearing device.

この発明の車輪用軸受装置は、複列の転走面が内周に形成された外方部材と、この外方部材の転走面と対向する転走面を形成した内方部材と、両転走面間に介在した複列の転動体とを備え、車体に対して車輪を回転自在に支持する車輪用軸受装置において、
前記外方部材に取付けられて前記内外の部材間の空間に連通した密封空間を形成するプラスチック製のセンサ取付部材を設け、このセンサ取付部材は、前記外方部材のインボード側の端部に取付けられて内方部材のインボード側端を覆うセンサキャップと、センサ素子を覆い前記センサキャップに取付けられるセンサ覆い体とを有し、このセンサ覆い体はセンサ挿入軸部と取付片とを有し、前記センサ素子と前記センサ覆い体とでセンサが構成され、
前記センサキャップに、その外表面に開口させてインサートナットを埋め込み、このインサートナットと並んで前記センサキャップにセンサ挿入孔を設け、前記センサの前記取付片を前記センサキャップの外表面に配置して前記センサを前記センサ挿入軸部で前記センサ挿入孔に挿入し、前記取付片に設けられたボルト挿入孔にセンサ固定ボルトを挿入して前記インサートナットにねじ込むことにより前記取付片を固定し、前記センサと対向する磁気エンコーダを前記内方部材に設け、前記センサキャップは、前記インサートナットの奥側端面に位置してインサートナット内からセンサキャップ内に貫通する小径孔を有し、この小径孔は、インサートナットの奥側端面に対向する受け面を内周に有していて、弾性を持つシール部材を前記受け面と前記インサートナットの奥側端面の間に締代を持って介在させることにより密封し、
前記シール部材が球であり、前記小径孔が、内面が球面状の孔であって、前記インサートナットの奥側端面に対応する箇所のセンサキャップの肉厚部分と、この肉厚部分から裏面に突出して内周面が前記受け面となる環状突部とに渡って形成されたものであり、
前記センサ取付部材に低吸水率プラスチック材料を用いたことを特徴とする。前記低吸水率プラスチック材料は、吸水率が例えば０．５％以下のものとする。 The wheel bearing device of the present invention includes an outer member having a double row rolling surface formed on the inner periphery, an inner member formed with a rolling surface opposite to the rolling surface of the outer member, In a wheel bearing device comprising a double row rolling element interposed between rolling surfaces, and rotatably supporting the wheel with respect to the vehicle body,
Plastic sensor mounting member to form a sealed space communicating with the space between the members of the inner and outer attached to the outer member is provided, the sensor mounting member, the end of the inboard side of the outer member A sensor cap that covers the inboard side end of the inner member and a sensor cover that covers the sensor element and is attached to the sensor cap. The sensor cover includes a sensor insertion shaft portion and a mounting piece. A sensor is constituted by the sensor element and the sensor cover,
An insert nut is embedded in the outer surface of the sensor cap, an insert nut is embedded, a sensor insertion hole is provided in the sensor cap along with the insert nut, and the mounting piece of the sensor is disposed on the outer surface of the sensor cap. The sensor is inserted into the sensor insertion hole at the sensor insertion shaft portion, a sensor fixing bolt is inserted into a bolt insertion hole provided in the mounting piece, and the mounting piece is fixed by screwing into the insert nut, A magnetic encoder facing the sensor is provided on the inner member, and the sensor cap has a small-diameter hole that is located on the end surface of the insert nut and penetrates from the insert nut into the sensor cap. The inner periphery of the insert nut is opposed to the end face of the insert nut, and the elastic sealing member is received by the receiver. Sealed by interposing with tightening margin between the inner end surface of the insert nut and,
The seal member is a sphere, the small-diameter hole is a hole having a spherical inner surface, and a thick portion of the sensor cap at a location corresponding to the back end surface of the insert nut, and from the thick portion to the back surface The inner peripheral surface protrudes and is formed across the annular protrusion that becomes the receiving surface,
A low water absorption plastic material is used for the sensor mounting member. The low water absorption plastic material has a water absorption of 0.5% or less, for example.

この構成によると、センサ取付部材を低吸水率プラスチック材料としたため、吸水による寸法変化が抑制され、また水と共に融雪剤を吸収してクラックを発生することが抑制され、密封性の低下が防止される。そのため、軸受空間に水や塵埃が浸入して軸受機能の低下を招いたり、センサ機能の低下を招くことが防止される。   According to this configuration, since the sensor mounting member is made of a plastic material with a low water absorption rate, the dimensional change due to water absorption is suppressed, and the generation of cracks by absorbing the snow melting agent together with water is suppressed, thereby preventing the deterioration of the sealing performance. The For this reason, it is possible to prevent water and dust from entering the bearing space to cause a reduction in bearing function and a reduction in sensor function.

この発明において、センサ覆い体と前記センサキャップとは、互いに同一のプラスチック材料からなるものとすることが好ましい。 The present invention smell Te, and the sensor cover member and the sensor cap, have preferably be comprised of the same plastic material to each other.

この発明の車輪用軸受装置は、外方部材および内方部材のうちの固定側の部材に取付けられて前記内外の部材間の空間に連通した密封空間を形成するプラスチック製のセンサ取付部材を設け、このセンサ取付部材は、前記外方部材のインボード側の端部に取付けられて内方部材のインボード側端を覆うセンサキャップと、センサ素子を覆い前記センサキャップに取付けられるセンサ覆い体とを有し、このセンサ覆い体はセンサ挿入軸部と取付片とを有し、前記センサ素子と前記センサ覆い体とでセンサが構成され、前記センサキャップに、その外表面に開口させてインサートナットを埋め込み、このインサートナットと並んで前記センサキャップにセンサ挿入孔を設け、前記センサの前記取付片を前記センサキャップの外表面に配置して前記センサを前記センサ挿入軸部で前記センサ挿入孔に挿入し、前記取付片に設けられたボルト挿入孔にセンサ固定ボルトを挿入して前記インサートナットにねじ込むことにより前記取付片を固定し、前記センサと対向する磁気エンコーダを前記内方部材に設け、前記センサキャップは、前記インサートナットの奥側端面に位置してインサートナット内からセンサキャップ内に貫通する小径孔を有し、この小径孔は、インサートナットの奥側端面に対向する受け面を内周に有していて、弾性を持つシール部材を前記受け面と前記インサートナットの奥側端面の間に締代を持って介在させることにより密封し、前記シール部材が球であり、前記小径孔が、内面が球面状の孔であって、前記インサートナットの奥側端面に対応する箇所のセンサキャップの肉厚部分と、この肉厚部分から裏面に突出して内周面が前記受け面となる環状突部とに渡って形成されたものであり、前記センサ取付部材に低吸水率プラスチック材料を用いたので、センサ取付部材に吸水による寸法変化や、融雪剤の侵入による微細なクラックの発生が抑制され、軸受空間やセンサ配置空間の確実な密封性を得ることができる。これにより、泥水や異物の浸入による軸受装置の長寿低下や、センサの検出機能低下が防止される。 The wheel bearing device of the present invention is provided with a plastic sensor mounting member which is attached to a fixed member of the outer member and the inner member and forms a sealed space communicating with the space between the inner and outer members. The sensor mounting member includes a sensor cap that is attached to the inboard side end of the outer member and covers the inboard side end of the inner member, and a sensor cover that covers the sensor element and is attached to the sensor cap. The sensor cover body has a sensor insertion shaft portion and a mounting piece, and the sensor element and the sensor cover body constitute a sensor, and the sensor cap is opened on the outer surface thereof to be inserted into the insert nut. The sensor cap is provided with a sensor insertion hole alongside the insert nut, and the mounting piece of the sensor is disposed on the outer surface of the sensor cap. A sensor is inserted into the sensor insertion hole at the sensor insertion shaft portion, a sensor fixing bolt is inserted into a bolt insertion hole provided in the mounting piece, and screwed into the insert nut to fix the mounting piece. Is provided on the inner member, the sensor cap has a small-diameter hole that is located on the back end surface of the insert nut and penetrates from the insert nut into the sensor cap. Sealed by having a receiving surface facing the back end surface of the insert nut on the inner periphery, and having an elastic seal member interposed between the receiving surface and the back end surface of the insert nut with a tightening margin The seal member is a sphere, the small-diameter hole is a hole having a spherical inner surface, and a sensor cap at a location corresponding to the rear end surface of the insert nut. Use of a thick portion, which is the inner peripheral surface is formed over the annular protrusion serving as the receiving surface and projecting from the thick portion on the back surface, a low water absorption plastic material into the sensor mounting member Therefore, the dimensional change due to water absorption in the sensor mounting member and the occurrence of fine cracks due to the intrusion of the snow melting agent are suppressed, and a reliable sealing property of the bearing space and the sensor arrangement space can be obtained. This prevents a decrease in the longevity of the bearing device and a decrease in the detection function of the sensor due to the intrusion of muddy water or foreign matter.

この発明の一実施形態を図１および図２と共に説明する。この車輪用軸受装置Ａは複列のアンギュラ玉軸受形式の転がり軸受であって、従動輪支持用である。なお、この明細書において、車両に取付けた状態で車両の車幅方向外側寄りとなる側をアウトボード側と言い、車両の中央寄りとなる側をインボード側と呼ぶ。図１では、左側がアウトボード側、右側がインボード側となる。 Illustrating an embodiment of the present invention in conjunction with FIGS. This wheel bearing device A is a double-row angular ball bearing type rolling bearing for supporting a driven wheel. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side. In FIG. 1, the left side is the outboard side and the right side is the inboard side.

この車輪用軸受装置Ａは、内周に複列の転走面１ａを有する外方部材１と、これら転走面１ａにそれぞれ対向する転走面２ａを有する内方部材２と、これら複列の転走面１ａ，２ａ間に介在した複列の転動体３とで軸受部が構成され、車体に対して車輪を回転自在に支持する。各列の転走面１ａ，２ａは接触角が背面合わせとなるように形成されている。転動体３はボールからなり、各列毎に保持器４で保持されている。内外の部材２，１間に形成される環状空間のアウトボード側端部は、オイルシール等の接触式のシール５で密封されている。   The wheel bearing device A includes an outer member 1 having a double row rolling surface 1a on the inner periphery, an inner member 2 having a rolling surface 2a facing each of the rolling surfaces 1a, and the double row. A bearing portion is formed by the double row rolling elements 3 interposed between the rolling surfaces 1a and 2a, and the wheel is rotatably supported with respect to the vehicle body. The rolling surfaces 1a and 2a in each row are formed so that the contact angle is the back-to-back alignment. The rolling elements 3 are formed of balls and are held by the cage 4 for each row. The end portion on the outboard side of the annular space formed between the inner and outer members 2 and 1 is sealed with a contact seal 5 such as an oil seal.

外方部材１は固定側の部材となるものであって、外周に設けられた車体取付フランジ１ｂを介して車体に取付けられる。車体取付フランジ１ｂは、車体（図示せず）に設置されたナックルに周方向複数箇所においてボルト（図示せず）によって締結される。車体取付フランジ１ｂのボルト挿入孔１ｃはねじ加工されており、上記ボルトは、ナックルに設けられた貫通孔を貫通し、ボルト挿入孔１ｃに先端の雄ネジ部分が螺合する。ボルト挿入孔１ｃをねじ孔とする代わりに、単にボルトが挿通される孔とし、ナット（図示せず）でボルトに締め付けるようにしても良い。   The outer member 1 is a member on the fixed side, and is attached to the vehicle body via a vehicle body attachment flange 1b provided on the outer periphery. The vehicle body mounting flange 1b is fastened to a knuckle installed on the vehicle body (not shown) by bolts (not shown) at a plurality of locations in the circumferential direction. The bolt insertion hole 1c of the vehicle body mounting flange 1b is threaded. The bolt penetrates a through hole provided in the knuckle, and the male screw portion at the tip is screwed into the bolt insertion hole 1c. Instead of using the bolt insertion hole 1c as a screw hole, the bolt insertion hole 1c may be simply a hole through which the bolt is inserted and tightened to the bolt with a nut (not shown).

内方部材２は回転側の部材となるものであって、外周のアウトボード側端に車輪取付フランジ６ａを有するハブ輪６と、このハブ輪６の外周のインボード側端に圧入状態に嵌合させた内輪７とを有する。内輪７は、ハブ輪６のインボード側端に形成されたフランジ状の加締部６ｂにより、ハブ輪６に対して軸方向に締め付け固定される。これらハブ輪６および内輪７のそれぞれに、上記複列の転走面２ａのうちの各列の転走面２ａが形成されている。ハブ輪６の車輪取付フランジ６ａに車輪（図示せず）がボルト６ｂにより取付けられる。   The inner member 2 is a member on the rotation side, and is fitted into a hub wheel 6 having a wheel mounting flange 6a at an outer outboard side end of the outer periphery and an inboard side end of the outer periphery of the hub wheel 6 in a press-fitted state. And an inner ring 7 combined. The inner ring 7 is clamped and fixed in the axial direction with respect to the hub ring 6 by a flange-shaped crimping portion 6 b formed at the inboard side end of the hub ring 6. Each of the hub wheel 6 and the inner ring 7 is formed with each row of rolling surfaces 2a of the double row rolling surfaces 2a. A wheel (not shown) is attached to the wheel attachment flange 6a of the hub wheel 6 by bolts 6b.

内方部材２の構成部品である内輪７には、回転センサ８の被検出部である磁気エンコーダ９が取付けられ、外方部材１には前記磁気エンコーダ９に対して軸方向に対向するセンサ１０が、センサ取付部材２４を構成するセンサキャップ１２を介して取付けられる。磁気エンコーダ９は、断面Ｌ型の金属環９ａと、円周方向にＮＳ交互の磁極を有しこの金属環９ａのインボード側端面に貼付けられた多極磁石環９ｂとよりなり、金属環９ａの円筒部を前記内輪７のインボード側端の外周に圧入嵌合することにより取付けられる。センサ１０は磁気センサからなり、多極磁石環９ｂの磁極に対向するように配置されている。センサ１０はセンサ素子１０ｃを有し、内方部材２と一体に回転する磁気エンコーダ９のＮＳ交互の磁極がセンサ素子１０ｃの前を横切ることにより、センサ素子１０ｃがその磁気変化を検出し、車輪回転数に比例した周波数の回転検出信号を出力する。
なお、磁気エンコーダ９は、円周方向に等間隔で複数の窓が形成されたり、等間隔で複数の山、谷が形成された磁性体のパルサリングであっても良い。また、多極磁石環９ｂとしては、ゴム磁石、プラスチック磁石、焼結磁石などが用いられる。 A magnetic encoder 9 that is a detected portion of a rotation sensor 8 is attached to an inner ring 7 that is a component of the inner member 2, and a sensor 10 that is axially opposed to the magnetic encoder 9 is attached to the outer member 1. Is attached via the sensor cap 12 constituting the sensor attachment member 24. The magnetic encoder 9 is composed of a metal ring 9a having an L-shaped cross section and a multipolar magnet ring 9b having NS alternating magnetic poles in the circumferential direction and affixed to the end face on the inboard side of the metal ring 9a. The cylindrical portion is attached by press-fitting to the outer periphery of the inboard side end of the inner ring 7. The sensor 10 is a magnetic sensor, and is disposed so as to face the magnetic poles of the multipolar magnet ring 9b. The sensor 10 has a sensor element 10c, and NS alternating magnetic poles of the magnetic encoder 9 rotating integrally with the inner member 2 cross the front of the sensor element 10c, so that the sensor element 10c detects the magnetic change, and the wheel A rotation detection signal having a frequency proportional to the rotation speed is output.
The magnetic encoder 9 may be a pulsar ring of a magnetic material in which a plurality of windows are formed at equal intervals in the circumferential direction, or a plurality of peaks and valleys are formed at equal intervals. As the multipolar magnet ring 9b, a rubber magnet, a plastic magnet, a sintered magnet, or the like is used.

センサキャップ１２は有底の円筒状とされ、外方部材１のインボード側端の内周に圧入嵌合して取付けられる。このセンサキャップ１２は、外方部材１のインボード側端を閉塞して、前記シール５と共に内外部材１，２間の前記環状空間に連通する密封空間１１を形成する。このセンサキャップ１２は、圧入嵌合部には金属環１２ｂが一体とされ、外方部材１に対する嵌合強度の強化が図られている。センサキャップ１２はプラスチック製とされ、その底面部１２ａには、その外表面に開口させてインサートナット１３が埋め込まれると共に、このインサートナット１３と並んでセンサ１０を挿入するセンサ挿入孔１４が設けられている。センサ挿入孔１４の内周面にはスリーブ１５が嵌合させてある。このスリーブ１５内にセンサ１０が挿入され、センサ１０の挿入軸部１０ａａの外周に嵌合させたＯリング１６で、センサ挿入軸部１０ａａとスリーブ１５の間が密封されている。   The sensor cap 12 has a bottomed cylindrical shape, and is attached by press-fitting to the inner periphery of the inboard side end of the outer member 1. The sensor cap 12 closes the inboard side end of the outer member 1 to form a sealed space 11 that communicates with the seal 5 together with the annular space between the inner and outer members 1 and 2. In the sensor cap 12, the metal ring 12 b is integrated with the press-fitting fitting portion so that the fitting strength with respect to the outer member 1 is enhanced. The sensor cap 12 is made of plastic, and an insert nut 13 is embedded in the bottom surface portion 12a so as to open on the outer surface thereof, and a sensor insertion hole 14 for inserting the sensor 10 along with the insert nut 13 is provided. ing. A sleeve 15 is fitted to the inner peripheral surface of the sensor insertion hole 14. The sensor 10 is inserted into the sleeve 15, and the space between the sensor insertion shaft portion 10aa and the sleeve 15 is sealed by an O-ring 16 fitted to the outer periphery of the insertion shaft portion 10aa of the sensor 10.

センサ１０は、プラスチック製のセンサ覆い体１０ａの先端に、センサ素子１０ｃを埋め込み状態に設けたものである。センサ素子１０ｃの磁気エンコーダ９との対向面は露出状態であっても良い。センサ覆い体１０ａは、前記センサ挿入軸部１０ａａとその後方に延びるセンサ基端部１０ａｂで構成され、両部１０ａａ，１０ａｂの間から、取付片１７が突出している。取付片１７はボルト挿通孔１８を有し、そのボルト挿通孔１８が前記インサートナット１３の開口に整合するように、センサキャップ１２の底面部１２ａの外表面に配置される。取付片１７のボルト挿通孔１８の内周面にはスリーブ１９が嵌合させてある。このスリーブ１９内に挿入したセンサ固定ボルト２０をインサートナット１３にねじ込むことにより、取付片１７がセンサキャップ底面部１２ａに締め付け固定され、センサ１０がセンサキャップ１２に取付けられる。   The sensor 10 has a sensor element 10c embedded in the tip of a plastic sensor cover 10a. The surface of the sensor element 10c facing the magnetic encoder 9 may be exposed. The sensor cover 10a is composed of the sensor insertion shaft portion 10aa and a sensor base end portion 10ab extending rearward thereof, and an attachment piece 17 projects from between both portions 10aa and 10ab. The mounting piece 17 has a bolt insertion hole 18, and is arranged on the outer surface of the bottom surface portion 12 a of the sensor cap 12 so that the bolt insertion hole 18 is aligned with the opening of the insert nut 13. A sleeve 19 is fitted to the inner peripheral surface of the bolt insertion hole 18 of the mounting piece 17. By screwing the sensor fixing bolt 20 inserted into the sleeve 19 into the insert nut 13, the mounting piece 17 is fastened and fixed to the sensor cap bottom surface portion 12 a, and the sensor 10 is mounted to the sensor cap 12.

前記センサキャップ１２およびセンサ覆い体１０ａにより、センサ取付部材２４が構成される。センサキャップ１２およびセンサ覆い体１０ａは、上記のようにプラスチック製とされるが、いずれも、低吸水率プラスチック材料が用いられる。また、センサキャップ１２とセンサ覆い体１０ａとは、互いに同一のプラスチック材料からなるものとされる。
前記低吸水率プラスチック材料は、吸水率が例えば０．５％以下の材料とする。低吸水率プラスチック材料としては、ＰＡ６１２、ＰＰＳ系の材料を用いることができる。これらＰＡ６１２，ＰＰＳ系の材料は、吸水率を抑えた高機能エンジニアリングプラスチックであり、いずれも吸水率が０．５％以下である。センサキャップ１２は、車輌アンダーシャシー部品であることから飛び石、氷片などが通常の使用状況においても衝突することが考えられることから補強としてＧＦ（ガラスファイバー）を材料含有させることもある。 The sensor cap 12 and the sensor cover 10a constitute a sensor mounting member 24. Although the sensor cap 12 and the sensor cover 10a are made of plastic as described above, a low water absorption plastic material is used for both. The sensor cap 12 and the sensor cover 10a are made of the same plastic material.
The low water absorption plastic material is a material having a water absorption of 0.5% or less, for example. As the low water absorption plastic material, PA612 and PPS materials can be used. These PA612 and PPS materials are high-performance engineering plastics with reduced water absorption, and all have a water absorption of 0.5% or less. Since the sensor cap 12 is a vehicle under chassis component, stepping stones, ice pieces, and the like may collide even under normal usage conditions. Therefore, GF (glass fiber) may be included as a reinforcing material.

センサキャップ底面部１２ａには、インサートナット１３の奥側端面に位置してインサートナット１３内からセンサキャップ１２の内側面に貫通する小径孔２１が設けられている。この小径孔２１は、インサートナット１３の奥側端面に対向する受け面２２を内周に有している。その受け面２２とインサートナット１３の奥側端面の間に、弾性を持つシール部材２３が締め代を持って介在させてあり、これにより小径孔２１が密封されている。ここでは、シール部材２３はゴム球とされている。ゴム球の材質は、例えばニトリルゴム、フッ素ゴム、アクリルゴム、水素化ニトリルゴムからなる。
シール部材２３の形状に合わせて、前記小径孔２１は内面が球面状の孔とされる。センサキャップ底面部１２ａにおけるインサートナット１３の奥側端面に対応する箇所の肉厚部分１２ａａと、この肉厚部分１２ａａから裏面に突出して内周面が前記受け面２２となる環状突部１２ａｂとに渡り、小径孔２１の前記球面状の内面が形成されている。 The sensor cap bottom surface portion 12 a is provided with a small-diameter hole 21 that is located on the back end surface of the insert nut 13 and penetrates from the insert nut 13 to the inner surface of the sensor cap 12. The small-diameter hole 21 has a receiving surface 22 that faces the end surface on the back side of the insert nut 13 on the inner periphery. An elastic seal member 23 is interposed between the receiving surface 22 and the back end surface of the insert nut 13 with a tightening margin, whereby the small-diameter hole 21 is sealed. Here, the seal member 23 is a rubber ball. The material of the rubber ball is made of, for example, nitrile rubber, fluorine rubber, acrylic rubber, or hydrogenated nitrile rubber.
In accordance with the shape of the seal member 23, the small diameter hole 21 has a spherical inner surface. A thick portion 12aa at a position corresponding to the back end surface of the insert nut 13 in the sensor cap bottom surface portion 12a, and an annular protrusion 12ab that protrudes from the thick portion 12aa to the back surface and has an inner peripheral surface serving as the receiving surface 22. Crossing, the spherical inner surface of the small diameter hole 21 is formed.

この構成の車輪用軸受装置によると、インサートナット１３内のねじ孔や、インサートナット１３の外周とセンサキャップ１２のプラスチック部分との接触面は、軸受内部に対して、前記小径孔２１を介して通じているだけであり、ねじ孔やセンサ固定ボルト２０の周辺で、他に軸受内部に通じる箇所がない。前記小径孔２１は、前記シール部材２３の介在により密封されている。そのため、インサートナット１３のねじ孔や、センサ固定ボルト２０、センサ覆い体１０ａ等の間に生じている僅かな隙間と軸受内部とが遮断され、前記隙間を通じて、泥水等の異物が軸受内部へ侵入することが、シール部材２３の密封作用で防止される。 According to the wheel bearing device of this configuration, the screw hole in the insert nut 13 and the contact surface between the outer periphery of the insert nut 13 and the plastic portion of the sensor cap 12 are connected to the inside of the bearing via the small diameter hole 21. There is no other location around the screw hole or sensor fixing bolt 20 that leads to the inside of the bearing. The small diameter hole 21 is sealed by the interposition of the seal member 23. Therefore, a slight gap generated between the screw hole of the insert nut 13, the sensor fixing bolt 20, the sensor cover 10 a, and the like is blocked from the inside of the bearing, and foreign matters such as muddy water enter the inside of the bearing through the gap. This is prevented by the sealing action of the seal member 23.

また、前記シール部材２３をゴム球とすると共に、前記小径孔２１を、内面がゴム球と締め代を形成する孔であって、インサートナット１３の奥側端面に対応する箇所のセンサキャップ１２の肉厚部分１２ａａと、この肉厚部分１２ａａから裏面に突出して内周面が前記受け面２２となる環状突部１２ａｂとに渡って形成されたものとしているので、シール部材２３を簡単な構造で容易に取付けることができる。球状のシール部材２３を球面状の小径孔２１の内面に締め代を持って配置するため、密封性がより優れたものとなる。   The seal member 23 is a rubber ball, and the small-diameter hole 21 is a hole whose inner surface forms a tightening allowance with the rubber ball, and the sensor cap 12 at a position corresponding to the rear end surface of the insert nut 13. Since the thick portion 12aa and the annular protrusion 12ab that protrudes from the thick portion 12aa to the back surface and the inner peripheral surface becomes the receiving surface 22 are formed, the seal member 23 has a simple structure. Can be easily installed. Since the spherical seal member 23 is disposed on the inner surface of the spherical small-diameter hole 21 with an allowance, sealing performance is further improved.

また、センサキャップ１２およびセンサ覆い体１０ａからなるセンサ取付部材２４は、低吸水率プラスチック材料からなるため、吸水による寸法変化が抑制され、かつ水と共に融雪剤を吸収してクラックを発生することが抑制され、密封性の低下が防止される。そのため、軸受空間に水や塵埃が侵入して軸受機能の低下を招くことが防止される。
融雪剤によるクラック発生は、融雪剤に含まれる塩化カルシウムの水溶液中のカルシウムイオンとポリアミド中のＯＨ基がイオン結合してしまい、分子間力で結合しているポリアミドの構造が破壊ためである。ＰＡ６６のように吸水率が高い（吸水率：１〜２％）とその影響を受け易い。 Further, the sensor mounting member 24 including the sensor cap 12 and the sensor cover 10a is made of a plastic material having a low water absorption rate, so that a dimensional change due to water absorption is suppressed, and a crack is generated by absorbing the snow melting agent together with water. It is suppressed and deterioration of sealing performance is prevented. Therefore, it is possible to prevent water and dust from entering the bearing space and causing a decrease in bearing function.
The generation of cracks due to the snow melting agent is because the calcium ions in the aqueous solution of calcium chloride contained in the snow melting agent and OH groups in the polyamide are ionically bonded, and the structure of the polyamide bonded by intermolecular force is destroyed. Like PA66, it has a high water absorption rate (water absorption rate: 1 to 2%) and is easily affected.

この実施形態におけるセンサキャップ１２およびセンサ覆い体１０ａの材料とした用いたプラスチック（ＰＡ６１２）と、従来使用されていたＰＡ６６の一般的性質（非強化タイプ）の代表例を表１に示す。   Table 1 shows typical examples of the general properties (non-reinforced type) of the plastic (PA612) used as the material of the sensor cap 12 and the sensor cover 10a in this embodiment and PA66 conventionally used.

Figure 0004794273
Figure 0004794273

表１に示すように、ＰＡ６１２の吸水率は０．４％であって、ＰＡ６６の１．２％より低い。このような低吸水率プラスチック材料をセンサキャップ１２およびセンサ覆い体１０ａに用いることで、吸水による寸法変化が生じ難く、また融雪剤によるクラック発生が抑えられ、耐候性、特に耐塩化カルシウム性能を上げることができる。   As shown in Table 1, the water absorption rate of PA612 is 0.4%, which is lower than 1.2% of PA66. By using such a low water absorption plastic material for the sensor cap 12 and the sensor cover 10a, dimensional change due to water absorption hardly occurs, cracking due to a snow melting agent is suppressed, and weather resistance, particularly calcium chloride resistance is improved. be able to.

図３は、参考提案例の車輪用軸受装置Ｂを示す。この車輪用軸受装置Ｂは、前記実施形態と同様、従動輪支持用の複列のアンギュラ玉軸受形式の転がり軸受からなる。よって、共通部分には同一の符号を付しここではその説明を省略する。この実施形態では、センサキャップ１２ａとセンサ１０が一体のものとされている。すなわち、センサキャップ１２ａの全体が一体のプラスチック製のものとされ、そのプラスチックの中に、センサ素子１０ｃが埋め込み状態に設けられている。センサ素子１０ｃの磁気エンコーダ９との対向面は露出状態であっても良い。 FIG. 3 shows a wheel bearing device B of a reference proposal example . This wheel bearing device B is composed of a double-row angular ball bearing type rolling bearing for supporting a driven wheel, as in the above embodiment. Therefore, the common parts are denoted by the same reference numerals, and the description thereof is omitted here. In this embodiment, the sensor cap 12a and the sensor 10 are integrated. That is, the entire sensor cap 12a is made of an integral plastic, and the sensor element 10c is embedded in the plastic. The surface of the sensor element 10c facing the magnetic encoder 9 may be exposed.

この提案例のセンサキャップ１２ａも、上記同様の高機能エンジニヤリングプラスチック等の低吸水率プラスチック材料からなる。したがって、センサキャップ１２ａの吸水による寸法変化やクラックの発生が防止されて、外方部材１のインボード側端の閉塞密封機能がセンサキャップ１２ａによって良好に維持され、軸受の長寿命化や磁気エンコーダ９の劣化防止に寄与できる。 The sensor cap 12a of the proposed example is also made of a low water absorption plastic material such as the above-mentioned high-performance engineering plastic. Therefore, the sensor cap 12a can be prevented from changing in size and cracking due to water absorption, and the sealing and sealing function of the inboard side end of the outer member 1 can be satisfactorily maintained by the sensor cap 12a. 9 can contribute to prevention of deterioration.

図４は、他の提案例の車輪用軸受装置Ｃを示す。この車輪用軸受装置Ｃは、第１および第２の実施形態と同様、従動輪支持用の複列のアンギュラ玉軸受形式の転がり軸受からなる。よって、共通部分には同一の符号を付しここでもその説明を省略する。この実施形態では、上記のような外方部材１のインボード側端を閉塞するセンサキャップ１２はなく、内外の部材２，１間に形成される環状空間のインボード側端部は、組み合わせシールタイプのシール５ａで密封され、前記シール５と共に内外部材１，２間の前記環状空間に連通する密封空間１１が形成される。 FIG. 4 shows a wheel bearing device C of another proposed example . As in the first and second embodiments, the wheel bearing device C is composed of a double row angular ball bearing type rolling bearing for supporting a driven wheel. Therefore, common parts are denoted by the same reference numerals, and description thereof is omitted here. In this embodiment, there is no sensor cap 12 for closing the inboard side end of the outer member 1 as described above, and the inboard side end portion of the annular space formed between the inner and outer members 2 and 1 is a combination seal. A sealed space 11 is formed which is sealed with a type of seal 5 a and communicates with the seal 5 together with the annular space between the inner and outer members 1 and 2.

また、外方部材１が、複列の転動体３の列間で径方向の内外に貫通したセンサ取付孔１ｄを有し、センサ素子１０ｃを埋め込んだセンサ取付部材２４Ａによってセンサ１０が構成される。このセンサ取付部材２４Ａは、前記センサ取付孔１ｄにこの取付孔１ｄを密封する状態に取付けられる形状のものとされている。この密封により、前記密封空間１１が形成される。ハブ輪６の外周面には、断面倒Ｕ字形の金属環９ｃが圧入固定され、さらにこの金属補強環９ｃの外周面には、円周方向にＮＳ交互の磁極を有する多極磁石環９ｄが貼付けられて、この多極磁石環９ｄと金属環９ｃとにより磁気エンコーダ９が構成されている。前記センサ１０のセンサ素子１０ｃは、この多極磁石環９ｄに近接対向するよう位置付けられている。このセンサ１０と磁気エンコーダ９とにより回転センサ８を構成し、上記同様車輪回転数に比例した周波数の回転検出信号を出力する。   Further, the sensor 10 is configured by the sensor mounting member 24A in which the outer member 1 has a sensor mounting hole 1d penetrating in and out of the radial direction between the rows of the double row rolling elements 3, and the sensor element 10c is embedded. . The sensor attachment member 24A is configured to be attached to the sensor attachment hole 1d so as to seal the attachment hole 1d. By this sealing, the sealed space 11 is formed. A metal ring 9c having an inverted U-shaped cross section is press-fitted and fixed to the outer peripheral surface of the hub ring 6, and a multipolar magnet ring 9d having NS alternating magnetic poles in the circumferential direction is further provided on the outer peripheral surface of the metal reinforcing ring 9c. The magnetic encoder 9 is configured by the multipolar magnet ring 9d and the metal ring 9c. The sensor element 10c of the sensor 10 is positioned so as to face and face the multipolar magnet ring 9d. The sensor 10 and the magnetic encoder 9 constitute a rotation sensor 8 and outputs a rotation detection signal having a frequency proportional to the wheel rotation speed as described above.

この提案例におけるセンサ取付部材２４Ａも、上記同様高機能エンジニヤリングプラスチック等の低吸水率プラスチック材料からなる。したがって、センサ取付部材２４Ａの吸水による寸法変化やクラックの発生が防止されて、密封空間１１の密封機能が、このセンサ取付部材２４Ａおよびシール５，５ａによって良好に維持され、軸受の長寿命化や磁気エンコーダ９の劣化防止に寄与する。 The sensor mounting member 24A in this proposed example is also made of a low water absorption plastic material such as a high-performance engineering plastic as described above. Therefore, the dimensional change and crack generation due to water absorption of the sensor mounting member 24A are prevented, and the sealing function of the sealed space 11 is well maintained by the sensor mounting member 24A and the seals 5 and 5a. This contributes to prevention of deterioration of the magnetic encoder 9.

なお、上記各実施形態では、センサ１０が回転検出用のものである場合につき説明したが、センサ１０は、この他に振動，温度，水分など、車輪用軸受装置の何らかの状態を検出するものであれば良い。また、上記各実施形態では、従動輪支持用の複列アンギュラ玉軸受形式の車輪用軸受装置に適用した例について述べたが、この発明は、駆動輪支持用の車輪用軸受装置や、テーパころタイプ等の車輪用軸受装置にも適用することができる。   In each of the embodiments described above, the case where the sensor 10 is for rotation detection has been described. However, the sensor 10 also detects some state of the wheel bearing device such as vibration, temperature, moisture, and the like. I just need it. Further, in each of the above embodiments, examples of application to a wheel bearing device of a double row angular contact ball bearing type for supporting a driven wheel have been described. However, the present invention relates to a wheel bearing device for supporting a driving wheel, and a tapered roller. The present invention can also be applied to a wheel bearing device of a type or the like.

この発明の第一実施形態にかかる車輪用軸受装置の断面図である。It is sectional drawing of the wheel bearing apparatus concerning 1st embodiment of this invention. 図１におけるII部の拡大図である。It is an enlarged view of the II section in FIG. 参考提案例にかかる車輪用軸受装置の断面図である。It is sectional drawing of the wheel bearing apparatus concerning a reference proposal example . 他の提案例にかかる車輪用軸受装置の断面図である。It is sectional drawing of the wheel bearing apparatus concerning other proposal examples . 従来例の要部断面図である。It is principal part sectional drawing of a prior art example. 図５におけるVI部の拡大図である。It is an enlarged view of the VI section in FIG.

符号の説明Explanation of symbols

１…外方部材
１ａ…転走面
２…内方部材
２ａ…転走面
３…転動体
１０ａ…センサ覆い体
１０ｃ…センサ素子
１１…密封空間
１２…センサキャップ
１２ａ…センサキャップ（センサ取付部材）
２４，２４Ａ…センサ取付部材
Ａ，Ｂ，Ｃ…車輪用軸受装置 DESCRIPTION OF SYMBOLS 1 ... Outer member 1a ... Rolling surface 2 ... Inner member 2a ... Rolling surface 3 ... Rolling body 10a ... Sensor covering body 10c ... Sensor element 11 ... Sealed space 12 ... Sensor cap 12a ... Sensor cap (sensor mounting member)
24, 24A ... Sensor mounting members A, B, C ... Wheel bearing device

Claims (2)

複列の転走面が内周に形成された外方部材と、この外方部材の転走面と対向する転走面を形成した内方部材と、両転走面間に介在した複列の転動体とを備え、車体に対して車輪を回転自在に支持する車輪用軸受装置において、
前記外方部材に取付けられて前記内外の部材間の空間に連通した密封空間を形成するプラスチック製のセンサ取付部材を設け、このセンサ取付部材は、前記外方部材のインボード側の端部に取付けられて内方部材のインボード側端を覆うセンサキャップと、センサ素子を覆い前記センサキャップに取付けられるセンサ覆い体とを有し、このセンサ覆い体はセンサ挿入軸部と取付片とを有し、前記センサ素子と前記センサ覆い体とでセンサが構成され、
前記センサキャップに、その外表面に開口させてインサートナットを埋め込み、このインサートナットと並んで前記センサキャップにセンサ挿入孔を設け、前記センサの前記取付片を前記センサキャップの外表面に配置して前記センサを前記センサ挿入軸部で前記センサ挿入孔に挿入し、前記取付片に設けられたボルト挿入孔にセンサ固定ボルトを挿入して前記インサートナットにねじ込むことにより前記取付片を固定し、前記センサと対向する磁気エンコーダを前記内方部材に設け、前記センサキャップは、前記インサートナットの奥側端面に位置してインサートナット内からセンサキャップ内に貫通する小径孔を有し、この小径孔は、インサートナットの奥側端面に対向する受け面を内周に有していて、弾性を持つシール部材を前記受け面と前記インサートナットの奥側端面の間に締代を持って介在させることにより密封し、
前記シール部材が球であり、前記小径孔が、内面が球面状の孔であって、前記インサートナットの奥側端面に対応する箇所のセンサキャップの肉厚部分と、この肉厚部分から裏面に突出して内周面が前記受け面となる環状突部とに渡って形成されたものであり、
前記センサ取付部材に低吸水率プラスチック材料を用いたことを特徴とする車輪用軸受装置。 An outer member in which a double row rolling surface is formed on the inner periphery, an inner member having a rolling surface opposite to the rolling surface of the outer member, and a double row interposed between both rolling surfaces A wheel bearing device for supporting the wheel rotatably with respect to the vehicle body,
Plastic sensor mounting member to form a sealed space communicating with the space between the members of the inner and outer attached to the outer member is provided, the sensor mounting member, the end of the inboard side of the outer member A sensor cap that covers the inboard side end of the inner member and a sensor cover that covers the sensor element and is attached to the sensor cap. The sensor cover includes a sensor insertion shaft portion and a mounting piece. A sensor is constituted by the sensor element and the sensor cover,
An insert nut is embedded in the outer surface of the sensor cap, an insert nut is embedded, a sensor insertion hole is provided in the sensor cap along with the insert nut, and the mounting piece of the sensor is disposed on the outer surface of the sensor cap. The sensor is inserted into the sensor insertion hole at the sensor insertion shaft portion, a sensor fixing bolt is inserted into a bolt insertion hole provided in the mounting piece, and the mounting piece is fixed by screwing into the insert nut, A magnetic encoder facing the sensor is provided on the inner member, and the sensor cap has a small-diameter hole that is located on the end surface of the insert nut and penetrates from the insert nut into the sensor cap. The inner periphery of the insert nut is opposed to the end face of the insert nut, and the elastic sealing member is received by the receiver. Sealed by interposing with tightening margin between the inner end surface of the insert nut and,
The seal member is a sphere, the small-diameter hole is a hole having a spherical inner surface, and a thick portion of the sensor cap at a location corresponding to the back end surface of the insert nut, and from the thick portion to the back surface The inner peripheral surface protrudes and is formed across the annular protrusion that becomes the receiving surface,
A wheel bearing device using a plastic material having a low water absorption rate for the sensor mounting member. 請求項１において、前記センサ覆い体と前記センサキャップとを、互いに同一のプラスチック材料からなるものとした車輪用軸受装置。 The wheel bearing device according to claim 1, wherein the sensor cover and the sensor cap are made of the same plastic material.
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