JP4829683B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP4829683B2
JP4829683B2 JP2006150937A JP2006150937A JP4829683B2 JP 4829683 B2 JP4829683 B2 JP 4829683B2 JP 2006150937 A JP2006150937 A JP 2006150937A JP 2006150937 A JP2006150937 A JP 2006150937A JP 4829683 B2 JP4829683 B2 JP 4829683B2
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cylindrical portion
cap
magnetic
magnetic encoder
attached
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JP2007321831A (en
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晃 鳥居
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NTN Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—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
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—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、回転センサが装着された車輪用軸受装置に関する。   The present invention relates to a wheel bearing device equipped with a rotation sensor.

自動車の車輪を支持する車輪用軸受装置には、複列の軌道面を内径側に有する外方部材と、この外方部材の各軌道面と対向する複列の軌道面を外径側に有する内方部材と、これらの外方部材と内方部材の軌道面間に複列に配列された転動体とからなり、外方部材を車体側に固定される固定部材、内方部材を車輪側に取り付けられる回転部材としたものがある。   A wheel bearing device for supporting a wheel of an automobile has an outer member having a double row raceway surface on the inner diameter side, and a double row raceway surface facing each raceway surface on the outer member on the outer diameter side. The inner member and rolling elements arranged in a double row between the outer member and the inner member raceway surface, a fixing member for fixing the outer member to the vehicle body side, and the inner member for the wheel side There is a rotating member that can be attached to.

また近年では、自動車の走行安定性を向上させるために、ＡＢＳ（Antilock Brake System）等が組み込まれることが多く、その制御のための車輪の回転を検出する回転センサが車輪用軸受装置に装着されている。この車輪の回転を検出する回転センサは、円周方向で複数の磁極に着磁された着磁部を有する磁気エンコーダと、磁気エンコーダの回転に伴う磁束の変化を検出する磁気センサとからなり、磁気エンコーダが外方部材と内方部材のうちの回転部材側に装着され、磁気センサがこれと対向させて固定部材側に装着される。磁気センサは、通常、その出力の処理回路を一緒に組み込んだセンサユニットとして固定部材側に装着される。   In recent years, ABS (Antilock Brake System) or the like is often incorporated in order to improve the running stability of a car, and a rotation sensor for detecting the rotation of the wheel for the control is mounted on the wheel bearing device. ing. The rotation sensor for detecting the rotation of the wheel includes a magnetic encoder having a magnetized portion magnetized by a plurality of magnetic poles in the circumferential direction, and a magnetic sensor for detecting a change in magnetic flux accompanying the rotation of the magnetic encoder. The magnetic encoder is mounted on the rotating member side of the outer member and the inner member, and the magnetic sensor is mounted on the fixed member side so as to face this. A magnetic sensor is usually mounted on the fixed member side as a sensor unit that incorporates a processing circuit for its output.

上述した外方部材を固定部材、内方部材を回転部材とした車輪用軸受装置には、外方部材のインボード側の端部に底部を有するキャップの円筒部を嵌合し、このキャップの底部に、磁気エンコーダの回転に伴う磁束の変化を検出する磁気センサを装着したものがある（例えば、特許文献１参照）。特許文献１には、磁気エンコーダの着磁部に対して、磁気センサを軸方向で対向するように装着した例と、磁気センサを半径方向で対向するように装着した例とが記載されている。   In the wheel bearing device in which the outer member described above is a fixed member and the inner member is a rotating member, a cylindrical portion of a cap having a bottom portion is fitted to an end portion on the inboard side of the outer member. Some have a magnetic sensor for detecting a change in magnetic flux accompanying rotation of a magnetic encoder at the bottom (see, for example, Patent Document 1). Patent Document 1 describes an example in which the magnetic sensor is mounted so as to face the magnetized portion of the magnetic encoder in the axial direction, and an example in which the magnetic sensor is mounted so as to face in the radial direction. .

特開２００５−３５１４０８号公報JP 2005-351408 A

特許文献１に記載された車輪用軸受装置のように、外方部材のインボード側の端部に嵌合されるキャップの底部に磁気センサを装着したものは、図５に示すように、キャップ１０の円筒部１０ａを外方部材１の端部に圧入する際に、センサユニット１３に組み込まれた磁気センサ１３ａが装着される底部１０ｄを圧入治具２０等によって押圧する必要があるので、キャップ１０の底部１０ｄが変形し、磁気エンコーダ１２の着磁部１２ａにわずかな隙間を開けて対向させる必要がある磁気センサ１３ａの装着位置がずれて、回転センサの検出精度に支障を来たす恐れがある。   Like the wheel bearing device described in Patent Document 1, a magnetic sensor attached to the bottom of the cap fitted to the end of the outer member on the inboard side is shown in FIG. When the cylindrical portion 10a is pressed into the end of the outer member 1, it is necessary to press the bottom portion 10d on which the magnetic sensor 13a incorporated in the sensor unit 13 is mounted by the press-fitting jig 20 or the like. 10 may be deformed, and the mounting position of the magnetic sensor 13a, which needs to be opposed to the magnetized portion 12a of the magnetic encoder 12 with a slight gap, may be shifted, thereby impairing the detection accuracy of the rotation sensor. .

そこで、本発明の課題は、磁気センサが装着されるキャップの底部を変形させることなく、キャップを外方部材の端部に圧入できるようにすることである。   Therefore, an object of the present invention is to enable the cap to be press-fitted into the end of the outer member without deforming the bottom of the cap to which the magnetic sensor is attached.

上記の課題を解決するために、本発明は、複列の軌道面を内径側に有し、車体側に固定される外方部材と、この外方部材の各軌道面と対向する複列の軌道面を外径側に有し、車輪側に取り付けられる内方部材と、これらの外方部材と内方部材の軌道面間に複列に配列された転動体とからなり、前記内方部材のインボード側の端部に円周方向で複数の磁極に着磁された着磁部を有する磁気エンコーダを装着し、前記外方部材のインボード側の端部に底部を有するキャップの円筒部を嵌合し、このキャップの底部に、前記磁気エンコーダの回転に伴う磁束の変化を検出する磁気センサを、前記磁気エンコーダの着磁部に対向させて装着した車輪用軸受装置において、前記キャップの円筒部と底部との間に、円筒部から内方に屈曲する円環部と、この円環部の内端から軸方向に延びて底部に連なる段差円筒部とを設けた構成を採用した。   In order to solve the above-described problems, the present invention has an outer member that has a double-row raceway surface on the inner diameter side and is fixed to the vehicle body side, and a double-row facing each raceway surface of the outer member. The inner member includes an inner member having a raceway surface on the outer diameter side and attached to the wheel side, and rolling elements arranged in a double row between the outer member and the raceway surface of the inner member. A cylindrical portion of a cap having a magnetic encoder having a magnetized portion magnetized by a plurality of magnetic poles in a circumferential direction at an end portion on the inboard side of the outer member, and having a bottom portion at an end portion on the inboard side of the outer member In a wheel bearing device in which a magnetic sensor for detecting a change in magnetic flux accompanying rotation of the magnetic encoder is mounted on the bottom of the cap so as to face the magnetized portion of the magnetic encoder, Between the cylindrical part and the bottom part, an annular part bent inward from the cylindrical part, and this Employing the configuration provided a stepped cylindrical portion continuous to the bottom portion extends axially from the inner end of the annular portion.

すなわち、キャップの円筒部と底部との間に、円筒部から内方に屈曲する円環部と、この円環部の内端から軸方向に延びて底部に連なる段差円筒部とを設けることにより、キャップを外方部材の端部に圧入する際に、その円環部を圧入治具等で押圧できるようにし、磁気センサが装着される底部を変形させることなく、キャップを外方部材の端部に圧入できるようにした。   That is, by providing an annular portion bent inward from the cylindrical portion and a stepped cylindrical portion extending in the axial direction from the inner end of the annular portion and continuing to the bottom portion between the cylindrical portion and the bottom portion of the cap. When the cap is pressed into the end of the outer member, the annular portion can be pressed with a press-fitting jig or the like, and the cap is inserted into the end of the outer member without deforming the bottom where the magnetic sensor is mounted. I was able to press fit into the part.

前記磁気エンコーダを、前記内方部材のインボード側の端部外径面に円筒部で嵌合される芯金に、この円筒部の軸受外側端から内方に屈曲する段差円環部と、この段差円環部の内端から軸方向に延びる段差円筒部と、この段差円筒部の先端から内方に屈曲する円環部とを設け、この円環部の軸受外側面に前記着磁部を設けたものとすることにより、磁気エンコーダの芯金を内方部材の端部外径面に圧入する際に、着磁部が設けられていない段差円環部を圧入治具等で押圧し、着磁部を損傷させることなく、磁気エンコーダの芯金を内方部材の端部外径面に圧入することができる。   A step ring portion bent inward from a bearing outer end of the cylindrical portion to a core metal fitted to the outer diameter surface of the inboard side end portion of the inner member by the cylindrical portion; A step cylindrical portion extending in the axial direction from the inner end of the step annular portion and an annular portion bent inward from the tip of the step cylindrical portion are provided, and the magnetized portion is provided on the bearing outer surface of the annular portion. When the core bar of the magnetic encoder is press-fitted into the outer diameter surface of the end of the inner member, the stepped annular portion not provided with the magnetized portion is pressed with a press-fitting jig or the like. The core bar of the magnetic encoder can be pressed into the outer diameter surface of the end portion of the inner member without damaging the magnetized portion.

前記キャップの段差円筒部を、その外径寸法が前記内方部材のインボード側の端部の外径寸法よりも小さく、その内径寸法が前記磁気エンコーダの芯金の段差円筒部の外径寸法よりも大きくなるように形成することにより、回転センサをコンパクトに車輪用軸受装置に装着することができる。   The step cylindrical portion of the cap has an outer diameter smaller than an outer diameter of an end on the inboard side of the inner member, and an inner diameter thereof is an outer diameter of the step cylindrical portion of the core bar of the magnetic encoder. The rotation sensor can be mounted on the wheel bearing device in a compact manner.

本発明の車輪用軸受装置は、キャップの円筒部と底部との間に、円筒部から内方に屈曲する円環部と、この円環部の内端から軸方向に延びて底部に連なる段差円筒部とを設けることにより、キャップを外方部材の端部に圧入する際に、その円環部を圧入治具等で押圧できるようにしたので、磁気センサが装着される底部を変形させることなく、キャップを外方部材の端部に圧入することができ、磁気センサの装着位置を精度よく設定することができる。   The wheel bearing device according to the present invention includes an annular portion bent inward from the cylindrical portion between the cylindrical portion and the bottom portion of the cap, and a step extending in the axial direction from the inner end of the annular portion and continuing to the bottom portion. By providing a cylindrical part, when the cap is press-fitted into the end of the outer member, the annular part can be pressed with a press-fitting jig or the like, so that the bottom part to which the magnetic sensor is attached is deformed. The cap can be pressed into the end of the outer member, and the mounting position of the magnetic sensor can be set with high accuracy.

前記磁気エンコーダを、内方部材のインボード側の端部外径面に円筒部で嵌合される芯金に、この円筒部の軸受外側端から内方に屈曲する段差円環部と、この段差円環部の内端から軸方向に延びる段差円筒部と、この段差円筒部の先端から内方に屈曲する円環部とを設け、この円環部の軸受外側面に着磁部を設けたものとすることにより、磁気エンコーダの芯金を内方部材の端部外径面に圧入する際に、着磁部が設けられていない段差円環部を圧入治具等で押圧し、着磁部を損傷させることなく、磁気エンコーダの芯金を内方部材の端部外径面に圧入することができる。   A stepped annular portion that bends inwardly from a bearing outer end of the cylindrical portion to a core metal that is fitted to the outer diameter surface of the inboard side end portion of the inner member by the cylindrical portion, A step cylindrical portion extending in the axial direction from the inner end of the step annular portion and an annular portion bent inward from the tip of the step cylindrical portion are provided, and a magnetized portion is provided on the bearing outer surface of the annular portion. Therefore, when the core bar of the magnetic encoder is press-fitted into the outer diameter surface of the end of the inner member, the stepped annular portion not provided with the magnetized portion is pressed with a press-fitting jig or the like. The core bar of the magnetic encoder can be pressed into the outer diameter surface of the end portion of the inner member without damaging the magnetic part.

前記キャップの段差円筒部を、その外径寸法が内方部材のインボード側の端部の外径寸法よりも小さく、その内径寸法が磁気エンコーダの芯金の段差円筒部の外径寸法よりも大きくなるように形成することにより、回転センサをコンパクトに車輪用軸受装置に装着することができる。   The step cylindrical portion of the cap has an outer diameter that is smaller than the outer diameter of the end on the inboard side of the inner member, and an inner diameter that is smaller than the outer diameter of the step cylindrical portion of the core of the magnetic encoder. By forming it so as to be large, the rotation sensor can be mounted on the wheel bearing device in a compact manner.

以下、図面に基づき、本発明の実施形態を説明する。この車輪用軸受装置は、図１に示すように、複列の軌道面２ａ、２ｂを内径側に有する外方部材１と、外方部材１の各軌道面２ａ、２ｂと対向する複列の軌道面４ａ、４ｂを外径側に有する内方部材３と、これらの外方部材１と内方部材３の間の軸受空間に複列に配列された転動体としてのボール５とからなり、外方部材１がフランジ６で車体側に固定される固定部材、内方部材３がフランジ７に車輪がハブボルト８で取り付けられる回転部材とされている。内方部材３のインボード側の軌道面４ｂは、内方部材３にかしめ付けで固定された別体の内輪３ａの外径面に設けられている。また、軸受空間のアウトボード側はシール部材９で密封され、インボード側は、装置全体が外方部材１の端部に嵌合されたキャップ１０で密封されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the wheel bearing device includes an outer member 1 having double-row raceway surfaces 2 a and 2 b on the inner diameter side, and double-row facing each raceway surface 2 a and 2 b of the outer member 1. An inner member 3 having raceway surfaces 4a and 4b on the outer diameter side, and balls 5 as rolling elements arranged in a double row in a bearing space between the outer member 1 and the inner member 3, The outer member 1 is a fixed member fixed to the vehicle body side by a flange 6, and the inner member 3 is a rotating member whose wheels are attached to the flange 7 by hub bolts 8. The track surface 4b on the inboard side of the inner member 3 is provided on the outer diameter surface of a separate inner ring 3a fixed to the inner member 3 by caulking. The outboard side of the bearing space is sealed with a seal member 9, and the entire inboard side is sealed with a cap 10 that is fitted to the end of the outer member 1.

前記内方部材３の内輪３ａのインボード側には、その端部外径面に嵌合された円筒部１１ａと、円筒部１１ａの軸受外側端から内方に屈曲する段差円環部１１ｂと、段差円環部１１ｂの内端から軸方向外方に延びる段差円筒部１１ｃと、段差円筒部１１ｃの先端から内方に屈曲する円環部１１ｄとからなる磁気エンコーダ１２の芯金１１が装着され、円環部１１ｄの軸受外側面に、円周方向で複数の磁極に着磁された磁性ゴムで形成された着磁部１２ａが設けられている。   On the inboard side of the inner ring 3a of the inner member 3, a cylindrical portion 11a fitted to the outer diameter surface of the end portion, a step annular portion 11b bent inward from the bearing outer end of the cylindrical portion 11a, A core bar 11 of a magnetic encoder 12 comprising a step cylindrical portion 11c extending axially outward from the inner end of the step annular portion 11b and an annular portion 11d bent inward from the tip of the step cylindrical portion 11c is mounted. A magnetized portion 12a made of magnetic rubber magnetized by a plurality of magnetic poles in the circumferential direction is provided on the bearing outer surface of the annular portion 11d.

また、前記外方部材１のインボード側の端部に嵌合されたキャップ１０は、外方部材１の端部内径面に嵌合された円筒部１０ａと、円筒部１０ａの軸受外側端で折り重ねられて内方に屈曲する円環部１０ｂと、円環部１０ｂの内端から軸方向外方に延びる段差円筒部１０ｃと、段差円筒部１０ｃの軸受外側端で連なる底部１０ｄとからなり、この底部１０ｄに、磁気エンコーダ１２の着磁部１２ａと軸方向で対向する磁気センサ１３ａのセンサユニット１３が装着され、磁気エンコーダ１２の回転に伴う磁束の変化を検出するようになっている。   The cap 10 fitted to the end portion on the inboard side of the outer member 1 includes a cylindrical portion 10a fitted to the inner diameter surface of the end portion of the outer member 1, and a bearing outer end of the cylindrical portion 10a. An annular portion 10b that is folded and bent inward, a step cylindrical portion 10c that extends axially outward from the inner end of the annular portion 10b, and a bottom portion 10d that continues at the bearing outer end of the step cylindrical portion 10c. The sensor unit 13 of the magnetic sensor 13a facing the magnetized portion 12a of the magnetic encoder 12 in the axial direction is attached to the bottom portion 10d so as to detect a change in magnetic flux accompanying the rotation of the magnetic encoder 12.

図２に示すように、前記キャップ１０の段差円筒部１０ｃは、その外径寸法Ｄが内方部材３のインボード側の内輪３ａの外径寸法Ａよりも小さく、その内径寸法ｄが磁気エンコーダ１２の芯金１１の段差円筒部１１ｃの外径寸法Ｂよりも大きくなるように形成されており、磁気エンコーダ１２と磁気センサ１３ａを組み込んだセンサユニット１３とで構成される回転センサがコンパクトに車輪用軸受装置に装着されている。   As shown in FIG. 2, the step cylindrical portion 10c of the cap 10 has an outer diameter D smaller than an outer diameter A of the inner ring 3a on the inboard side of the inner member 3, and an inner diameter d of the magnetic encoder. The rotation sensor composed of the magnetic encoder 12 and the sensor unit 13 incorporating the magnetic sensor 13a is formed compactly so as to be larger than the outer diameter B of the step cylindrical portion 11c of the twelve metal core 11. It is mounted on a bearing device for a vehicle.

図３は、前記磁気エンコーダ１２の芯金１１を内輪３ａの端部外径面に圧入する状態を示す。芯金１１は、磁気エンコーダ１２の着磁部１２ａが設けられていない段差円環部１１ｂを、圧入治具２０ａの環状の先端部で押圧され、内輪３ａの端部外径面に圧入される。したがって、磁気エンコーダ１２の着磁部１２ａが損傷することはない。   FIG. 3 shows a state in which the core 11 of the magnetic encoder 12 is press-fitted into the outer diameter surface of the end of the inner ring 3a. The cored bar 11 is pressed into the stepped annular portion 11b of the magnetic encoder 12 where the magnetized portion 12a is not provided by the annular tip of the press-fitting jig 20a, and is press-fitted into the outer diameter surface of the end of the inner ring 3a. . Therefore, the magnetized portion 12a of the magnetic encoder 12 is not damaged.

図４は、前記キャップ１０を外方部材１のインボード側の端部内径面に圧入する状態を示す。キャップ１０は円環部１０ｂを圧入治具２０ｂの環状の先端部で押圧されて、外方部材１の端部内径面に圧入される。したがって、磁気センサ１３ａのセンサユニット１３が装着される底部１０ｄが変形することはなく、磁気センサ１３ａと磁気エンコーダ１２の着磁部１２ａとの軸方向隙間を精度よく設定することができる。   FIG. 4 shows a state in which the cap 10 is press-fitted into the inner diameter surface of the end portion on the inboard side of the outer member 1. The cap 10 is pressed into the inner diameter surface of the end portion of the outer member 1 by pressing the annular portion 10b with the annular tip portion of the press-fitting jig 20b. Therefore, the bottom portion 10d to which the sensor unit 13 of the magnetic sensor 13a is mounted is not deformed, and the axial gap between the magnetic sensor 13a and the magnetized portion 12a of the magnetic encoder 12 can be set with high accuracy.

上述した実施形態では、磁気センサを磁気エンコーダの着磁部と軸方向で対向させるものとしたが、磁気センサを磁気エンコーダの着磁部と半径方向で対向させるものとすることもできる。   In the embodiment described above, the magnetic sensor is opposed to the magnetized portion of the magnetic encoder in the axial direction. However, the magnetic sensor may be opposed to the magnetized portion of the magnetic encoder in the radial direction.

車輪用軸受装置の実施形態を示す縦断面図A longitudinal sectional view showing an embodiment of a wheel bearing device 図１の回転センサの装着部を示す断面図Sectional drawing which shows the mounting part of the rotation sensor of FIG. 図１の磁気エンコーダの芯金を圧入する状態を示す断面図Sectional drawing which shows the state which press-fits the metal core of the magnetic encoder of FIG. 図１のキャップを圧入する状態を示す断面図Sectional drawing which shows the state which press-fits the cap of FIG. 従来のキャップを圧入する状態を示す断面図Sectional drawing which shows the state which press-fits the conventional cap

符号の説明Explanation of symbols

１ 外方部材
２ａ、２ｂ 軌道面
３ 内方部材
３ａ 内輪
４ａ、４ｂ 軌道面
５ ボール
６、７ フランジ
８ ハブボルト
９ シール部材
１０ キャップ
１０ａ 円筒部
１０ｂ 円環部
１０ｃ 段差円筒部
１０ｄ 底部
１１ 芯金
１１ａ 円筒部
１１ｂ 段差円環部
１１ｃ 段差円筒部
１１ｄ 円環部
１２ 磁気エンコーダ
１２ａ 着磁部
１３ センサユニット
１３ａ 磁気センサ
２０、２０ａ、２０ｂ 圧入治具 DESCRIPTION OF SYMBOLS 1 Outer member 2a, 2b Track surface 3 Inner member 3a Inner ring 4a, 4b Track surface 5 Ball 6, 7 Flange 8 Hub bolt 9 Seal member 10 Cap 10a Cylindrical part 10b Ring part 10c Step cylindrical part 10d Bottom part 11 Core 11a Cylindrical portion 11b Step annular portion 11c Step cylindrical portion 11d Circular portion 12 Magnetic encoder 12a Magnetized portion 13 Sensor unit 13a Magnetic sensors 20, 20a, 20b Press-fitting jig

Claims (1)

複列の軌道面(２ａ、２ｂ)を内径側に有し、車体側に固定される外方部材(１)と、この外方部材(１)の各軌道面(２ａ、２ｂ)と対向する複列の軌道面(４ａ、４ｂ)を外径側に有し、車輪側に取り付けられる内方部材(３)と、これらの外方部材と内方部材の軌道面(２ａ、２ｂ)、(４ａ、４ｂ)間に複列に配列された転動体(５)とからなり、前記内方部材(３)のインボード側の端部に取付けられた芯金(１１)に円周方向で複数の磁極に着磁された磁気エンコーダ(１２)が装着され、前記外方部材(１)のインボード側の端部に取付けられて軸受空間のインボード側を密封するキャップ(１０)に、前記磁気エンコーダ(１２)と対向し、その磁気エンコーダ(１２)の回転に伴う磁束の変化を検出する磁気センサ(１３ａ)が装着された車輪用軸受装置において、
前記キャップ(１０)が、前記外方部材(１)の端部内径面に嵌合される円筒部(１０ａ)と、その円筒部(１０ａ)の軸方向端から径方向外方に延び、その外周から径方向内方に向く折り返しとされて、前記円筒部(１０ａ)の内径面より内方に延びる円環部(１０ｂ)と、その円環部(１０ｂ)の内端から軸方向外方に延びる段差円筒部(１０ｃ)と、その段差円筒部(１０ｃ)の開口端を閉塞する底部(１０ｄ)とからなり、そのキャップ(１０)の底部(１０ｄ)に前記磁気センサ(１３ａ)が装着され、
前記磁気エンコーダ(１２)が装着された芯金(１１)が、前記内方部材(３)の端部外径面に嵌合される円筒部(１１ａ)と、その円筒部(１１ａ)の軸方向端から径方向内方に延びる段差円環部(１１ｂ)と、その段差円環部(１１ｂ)の内端から軸方向外方に延びて、先端部が前記キャップ(１０)の段差円筒部(１０ｃ)と径方向隙間を介して対向する段差円筒部(１１ｃ)と、その段差円筒部(１１ｃ)の軸方向端から径方向内方に延びる円環部(１１ｄ)とからなり、その芯金(１１)の円環部(１１ｄ)に前記磁気エンコーダ(１２)が装着され、
前記キャップ(１０)の段差円筒部(１０ｃ)の外形寸法(Ｄ)が前記内方部材(３)のインボード側端部の外形寸法(Ａ)より小さく、内径寸法(ｄ)が前記芯金(１１)の段差円筒部(１１ｃ)の外径寸法(Ｂ)より大きくされ、
前記キャップ(１０)の段差円筒部(１０ｃ)と前記磁気エンコーダ（１２）を含む前記芯金(１１)の段差円筒部(１１ｃ)とが内外で嵌り合う重複部の軸方向長さがキャップ(１０)に設けられた円筒部(１０ａ)の軸方向長さより長くされていること、
を特徴とする車輪用軸受装置。 An outer member (1) having a double-row raceway surface (2a, 2b) on the inner diameter side and fixed to the vehicle body side, and faces each raceway surface (2a, 2b) of the outer member (1). Inner members (3) having double-row raceway surfaces (4a, 4b) on the outer diameter side and attached to the wheel side, and raceway surfaces (2a, 2b) of these outer members and inner members ( 4a, 4b) and a plurality of rolling elements (5) arranged in a double row, and a plurality of core members (11) attached to the inboard side end of the inner member (3) are arranged in the circumferential direction. A magnetic encoder (12) magnetized on the magnetic pole of the outer member (1) is attached to the end of the outer member (1) on the inboard side, and the cap (10) for sealing the inboard side of the bearing space is attached to the cap (10). In a wheel bearing device equipped with a magnetic sensor (13a) facing the magnetic encoder (12) and detecting a change in magnetic flux accompanying rotation of the magnetic encoder (12) ,
The cap (10) extends radially outward from the axial end of the cylindrical portion (10a) fitted to the inner diameter surface of the end of the outer member (1), An annular portion (10b) that extends inward from the inner peripheral surface of the cylindrical portion (10a) and is turned outward from the outer periphery in the radial direction, and axially outward from the inner end of the annular portion (10b). And a bottom portion (10d) for closing the opening end of the step cylindrical portion (10c), and the magnetic sensor (13a) is mounted on the bottom portion (10d) of the cap (10). And
A core part (11) to which the magnetic encoder (12) is attached is fitted into a cylindrical part (11a) fitted to an outer diameter surface of an end part of the inner member (3), and a shaft of the cylindrical part (11a) A step annular portion (11b) extending radially inward from the direction end, and a step cylindrical portion of the cap (10) extending from the inner end of the step annular portion (11b) outward in the axial direction. A step cylindrical portion (11c) opposed to (10c) via a radial gap, and an annular portion (11d) extending radially inward from the axial end of the step cylindrical portion (11c) The magnetic encoder (12) is attached to the annular portion (11d) of the gold (11),
The outer dimension (D) of the stepped cylindrical portion (10c) of the cap (10) is smaller than the outer dimension (A) of the inboard side end of the inner member (3), and the inner diameter dimension (d) is the core metal. The outer diameter dimension (B) of the stepped cylindrical portion (11c) of (11),
The axial length of the overlapping portion where the step cylindrical portion (10c) of the cap (10) and the step cylindrical portion (11c) of the core metal (11) including the magnetic encoder (12) fit inside and outside is the cap ( 10) that is longer than the axial length of the cylindrical portion (10a) provided in
Wheel bearing device according to claim.
JP2006150937A 2006-05-31 2006-05-31 Wheel bearing device Expired - Fee Related JP4829683B2 (en)

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