JP2009025009A - State quantity measuring device for rolling bearing unit - Google Patents

State quantity measuring device for rolling bearing unit Download PDF

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JP2009025009A
JP2009025009A JP2007185355A JP2007185355A JP2009025009A JP 2009025009 A JP2009025009 A JP 2009025009A JP 2007185355 A JP2007185355 A JP 2007185355A JP 2007185355 A JP2007185355 A JP 2007185355A JP 2009025009 A JP2009025009 A JP 2009025009A
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cover
inner ring
sensor
rolling bearing
bearing unit
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JP2009025009A5 (en
JP5007616B2 (en
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Tsutomu Hibi
勉 日比
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To realize a structure capable of acquiring easily proper layout for each sensor module 36s<SB>1</SB>, even when a metal plate cover 8a that holds a sensor holder 10a made of a synthetic resin is installed in a narrow space, and moreover the number of sensor modules 36s<SB>1</SB>embedded in the sensor holder 10a is large, for example six or seven. <P>SOLUTION: Large apertures 35a or small apertures are formed respectively on a plurality of spots in the circumferential direction of a middle part in the axial direction of the cover 8a, and each sensor module 36s<SB>1</SB>is arranged inside each large aperture 35a and any of the apertures of the small apertures, respectively, and embedded into the sensor holder 10a in this state. By adopting such a constitution, the problem is solved. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

この発明に係る転がり軸受ユニットの状態量測定装置は、転がり軸受ユニットを構成する外輪とハブとの間に作用する外力等の状態量を測定する為に利用する。更に、この求めた状態量を、自動車等の車両の走行安定性確保を図る為に利用する。   The state quantity measuring device for a rolling bearing unit according to the present invention is used for measuring a state quantity such as an external force acting between an outer ring and a hub constituting the rolling bearing unit. Further, the obtained state quantity is used for ensuring the running stability of a vehicle such as an automobile.

例えば自動車の車輪は懸架装置に対し、複列アンギュラ型等の転がり軸受ユニットにより回転自在に支持する。又、自動車の走行安定性を確保する為に、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）、更には、電子制御式ビークルスタビリティコントロールシステム（ＥＳＣ）等の車両用走行安定化装置が使用されている。この様な各種車両用走行安定化装置を制御する為には、車輪の回転速度、車体に加わる各方向の加速度等を表す信号が必要になる。そして、より高度の制御を行なう為には、車輪を介して上記転がり軸受ユニットに加わる荷重（例えばラジアル荷重とアキシアル荷重との一方又は双方）の大きさを知る事が好ましい場合がある。   For example, a wheel of an automobile is rotatably supported by a rolling bearing unit such as a double-row angular type with respect to a suspension device. In addition, in order to ensure the running stability of automobiles, for example, anti-lock braking system (ABS), traction control system (TCS), and electronically controlled vehicle stability control system (ESC) etc. The device is in use. In order to control such various vehicle running stabilization devices, signals representing the rotational speed of the wheels, acceleration in each direction applied to the vehicle body, and the like are required. In order to perform higher-level control, it may be preferable to know the magnitude of a load (for example, one or both of a radial load and an axial load) applied to the rolling bearing unit via a wheel.

この様な事情に鑑みて、特許文献１には、特殊なエンコーダを使用して、転がり軸受ユニットに加わる荷重の大きさを測定する発明が記載されている。図７〜８は、この特許文献１に記載された構造と同じ荷重の測定原理を採用している、転がり軸受ユニットの状態量測定装置に関する先発明の構造の１例として、特願２００７−９７０４２に記載されたものを示している。この先発明の構造は、使用時にも回転しない外輪１の内径側に、使用時に車輪を支持固定した状態でこの車輪と共に回転する、内輪相当部材であるハブ２を、複数個の転動体３、３を介して、回転自在に支持している。これら各転動体３、３には、背面組み合わせ型の接触角と共に、予圧を付与している。尚、図示の例では、これら各転動体３、３として玉を使用しているが、重量が嵩む自動車用の軸受ユニットの場合には、玉に代えて円すいころを使用する場合もある。   In view of such circumstances, Patent Document 1 describes an invention in which a special encoder is used to measure the magnitude of a load applied to a rolling bearing unit. FIGS. 7 to 8 show Japanese Patent Application No. 2007-97042 as an example of the structure of the prior invention relating to the state quantity measuring device for a rolling bearing unit, which adopts the same load measurement principle as the structure described in Patent Document 1. Is shown. In the structure of this prior invention, on the inner diameter side of the outer ring 1 that does not rotate even in use, the hub 2 that is an inner ring equivalent member that rotates together with the wheel in a state where the wheel is supported and fixed in use is provided with a plurality of rolling elements 3, 3. It is rotatably supported via A preload is applied to each of the rolling elements 3 and 3 together with a contact angle of the rear combination type. In the illustrated example, balls are used as the rolling elements 3 and 3. However, in the case of an automobile bearing unit that is heavy, tapered rollers may be used instead of balls.

又、上記ハブ２の軸方向内端部（軸方向に関して「内」とは、自動車への組み付け状態で車両の幅方向中央側を言い、図１、７の右側。反対に、車両の幅方向外側となる、図１、７の左側を、軸方向に関して「外」と言う。本明細書全体で同じ。）には、円筒状のエンコーダ４を、上記ハブ２と同心に支持固定している。このエンコーダ４は、上記ハブ２を構成する内輪７の軸方向内端部に外嵌固定した、磁性金属製で円環状の芯金５と、この芯金５の外周面の軸方向外端部乃至中間部の全周に添着固定した、永久磁石製で円筒状のエンコーダ本体６とから成る。被検出面である、このエンコーダ本体６の外周面には、Ｓ極とＮ極とを、円周方向に関して交互に且つ等間隔に配置している。これらＳ極とＮ極との境界は、軸方向中央部が円周方向に関して最も突出した、「く」字形となっている。   Also, the inner end of the hub 2 in the axial direction ("inner" with respect to the axial direction refers to the center in the width direction of the vehicle when assembled to the automobile, and is the right side of FIGS. 1 and 7. On the contrary, in the width direction of the vehicle. The left side of FIGS. 1 and 7, which is the outer side, is referred to as “outside” in the axial direction. The same applies throughout the present specification.) The cylindrical encoder 4 is supported and fixed concentrically with the hub 2. . The encoder 4 includes an annular cored bar 5 made of magnetic metal that is externally fitted and fixed to an axially inner end of the inner ring 7 constituting the hub 2, and an axially outer end of the outer peripheral surface of the cored bar 5. Or an encoder body 6 made of a permanent magnet and fixedly attached to the entire circumference of the intermediate portion. On the outer peripheral surface of the encoder main body 6 that is the detection surface, S poles and N poles are alternately arranged at equal intervals in the circumferential direction. The boundary between these S poles and N poles has a "<" shape with the central portion in the axial direction protruding most in the circumferential direction.

又、上記外輪１の軸方向内端部に、金属板製で円環状のカバー８を支持固定すると共に、このカバー８の内側に、１対のセンサ９ａ、９ｂを包埋した、合成樹脂製で円環状のセンサホルダ１０を保持している。そして、この状態で、上記両センサ９ａ、９ｂの検出部を、上記エンコーダ４の被検出面の軸方向両半部に、それぞれ１つずつ近接対向させている。尚、上記両センサ９ａ、９ｂの検出部には、ホールＩＣ、ホール素子、ＭＲ素子、ＧＭＲ素子等の磁気検知素子を組み込んでいる。又、上記両センサ９ａ、９ｂはそれぞれ、このセンサ９ａ（９ｂ）に複数本のセンサリード（図示せず）を接続して成る、センサモジュールとした状態で、上記センサホルダ１０に包埋支持している。上記複数本のセンサリードはそれぞれ、上記センサ９ａ（９ｂ）の出力信号を取り出したり、このセンサ９ａ（９ｂ）に電力を供給する役目を有する。   Further, an annular cover 8 made of a metal plate is supported and fixed to the inner end of the outer ring 1 in the axial direction, and a pair of sensors 9 a and 9 b are embedded inside the cover 8. The annular sensor holder 10 is held. In this state, the detection portions of both the sensors 9a and 9b are made to approach and face each other in the axial half of the detection surface of the encoder 4 one by one. In addition, magnetic detection elements such as a Hall IC, a Hall element, an MR element, and a GMR element are incorporated in the detection portions of both the sensors 9a and 9b. Each of the sensors 9a and 9b is embedded and supported in the sensor holder 10 in a sensor module formed by connecting a plurality of sensor leads (not shown) to the sensor 9a (9b). ing. Each of the plurality of sensor leads has a function of taking out an output signal of the sensor 9a (9b) and supplying electric power to the sensor 9a (9b).

又、上記カバー８は、大径円筒部１１と、この大径円筒部１１の軸方向内端部から径方向内方に向け直角に折れ曲がった円輪部１２と、この円輪部１２の径方向内端部から軸方向外方に向け直角に折れ曲がった小径円筒部１３とを備える。一方、上記外輪１の外周面の軸方向中間部に、この外輪１を懸架装置を構成するナックル等に取り付け固定する為の取付フランジ１４を、同じく軸方向内端寄り部分に取付用円筒面１５を、同じく軸方向内端部に、この取付用円筒面１５よりも外径が小さくなった嵌合用小径部１６を、それぞれ設けている。上記カバー８は、上記大径円筒部１１の軸方向外端部を、上記嵌合用小径部１６に締り嵌めで外嵌する事により、上記外輪１に対し支持固定している。この状態で、上記大径円筒部１１の外径は、上記取付用円筒面１５の外径以下である。この取付用円筒面１５は、上記外輪１を上記ナックル等に取り付け固定する際に、このナックル等に設けた取付孔に内嵌するが、この際、上記カバー８がこの内嵌作業の妨げとはならない。   The cover 8 includes a large-diameter cylindrical portion 11, an annular portion 12 bent at a right angle from the axially inner end of the large-diameter cylindrical portion 11 toward the radially inner side, and the diameter of the annular portion 12. A small-diameter cylindrical portion 13 bent at a right angle from the inner end portion in the direction toward the outer side in the axial direction. On the other hand, a mounting flange 14 for mounting and fixing the outer ring 1 to a knuckle or the like constituting the suspension device is provided at an axially intermediate portion of the outer peripheral surface of the outer ring 1, and a mounting cylindrical surface 15 is also provided at a portion near the inner end in the axial direction. Similarly, a small diameter portion 16 for fitting whose outer diameter is smaller than that of the mounting cylindrical surface 15 is provided at the inner end portion in the axial direction. The cover 8 is supported and fixed to the outer ring 1 by fitting the outer end portion in the axial direction of the large-diameter cylindrical portion 11 to the small-diameter portion 16 for fitting with an interference fit. In this state, the outer diameter of the large-diameter cylindrical portion 11 is equal to or smaller than the outer diameter of the mounting cylindrical surface 15. The mounting cylindrical surface 15 is fitted into a mounting hole provided in the knuckle or the like when the outer ring 1 is fixed to the knuckle or the like. At this time, the cover 8 prevents the fitting operation. Must not.

又、上記センサホルダ１０は、射出成形する事に伴って、上記両センサ９ａ、９ｂを包埋支持すると共に、上記カバー８に対し一体的に結合している。又、この状態で、上記センサホルダ１０の一部、及び、上記各センサモジュールを構成する各センサリードに接続したハーネス１７を、上記カバー８の円輪部１２の１個所に形成した通孔１８を通じて、外部空間に引き出している。   The sensor holder 10 embeds and supports the sensors 9a and 9b as it is injection-molded, and is integrally coupled to the cover 8. In this state, a harness 17 connected to a part of the sensor holder 10 and each sensor lead constituting each sensor module is formed in a through hole 18 formed in one place of the annular portion 12 of the cover 8. Through to the outside space.

又、上記カバー８を構成する小径円筒部１３の内周面と、上記エンコーダ４を構成する芯金５の外周面の軸方向内端部に形成した小径部１９との間に、このエンコーダ４を設置した空間２０と外部空間との間を遮断する、シールリング２１を組み付けている。このシールリング２１は、上記小径部１９に締り嵌めで外嵌固定した芯金２２と、その先端縁を上記小径円筒部１３の内周面の全周に摺接させた弾性材２３とから成る。又、上記外輪１の内周面の軸方向内端寄り部分と、前記内輪７の外周面の軸方向内端寄り部分との間に、上記エンコーダ４を設置した空間２０と前記各転動体３、３を設置した空間２４との間を遮断する、組み合わせシールリング２５を組み付けている。更に、図示の転がり軸受ユニットは、自動車の駆動輪を支持する為のものである為、前記ハブ２の中心部に、スプライン孔２６を設けている。そして、このスプライン孔２６に、等速ジョイント２７のスプライン軸２８を係合させた状態で、このスプライン軸２８の先端部に螺合したボルト２９を締め付ける事により、上記ハブ２と上記等速ジョイント２７とを結合固定している。   Further, between the inner peripheral surface of the small-diameter cylindrical portion 13 constituting the cover 8 and the small-diameter portion 19 formed at the inner end in the axial direction of the outer peripheral surface of the metal core 5 constituting the encoder 4, the encoder 4. A seal ring 21 that cuts off the space 20 between the space 20 and the external space is assembled. The seal ring 21 includes a cored bar 22 that is externally fixed to the small-diameter portion 19 by an interference fit, and an elastic material 23 having a tip edge thereof slidably contacted with the entire inner peripheral surface of the small-diameter cylindrical portion 13. . Further, the space 20 in which the encoder 4 is installed and the rolling elements 3 between the portion near the inner end in the axial direction of the inner peripheral surface of the outer ring 1 and the portion closer to the inner end in the axial direction of the outer peripheral surface of the inner ring 7. 3 is assembled with a combination seal ring 25 that blocks the space 24 in which the space 3 is installed. Further, since the illustrated rolling bearing unit is for supporting the driving wheel of the automobile, a spline hole 26 is provided in the center of the hub 2. The hub 2 and the constant velocity joint are tightened by tightening a bolt 29 screwed to the tip of the spline shaft 28 in a state where the spline shaft 28 of the constant velocity joint 27 is engaged with the spline hole 26. 27 is fixedly coupled.

上述の様に構成する転がり軸受ユニットの状態量測定装置の場合、外輪１とハブ２との間にアキシアル荷重が作用する事により、これら外輪１とハブ２とがアキシアル方向に相対変位すると、これに伴って、上記両センサ９ａ、９ｂの出力信号同士の間に存在する位相差比（＝位相差／１周期）が変化する。この位相差比は、上記アキシアル荷重の作用方向及び大きさ（上記相対変位の方向及び大きさ）に見合った値をとる。従って、この位相差比に基づいて、上記アキシアル荷重の作用方向及び大きさ（上記相対変位の方向及び大きさ）を求める事ができる。尚、これらを求める処理は、図示しない演算器により行なう。この為、この演算器のメモリ中には、予め理論計算や実験により調べておいた、上記位相差比と、上記アキシアル方向の相対変位又は荷重との関係（零点及びゲイン）を表す、式やマップを記憶させておく。   In the state measuring device for a rolling bearing unit configured as described above, when an axial load acts between the outer ring 1 and the hub 2, the outer ring 1 and the hub 2 are displaced relative to each other in the axial direction. Accordingly, the phase difference ratio (= phase difference / 1 period) existing between the output signals of the sensors 9a and 9b changes. This phase difference ratio takes a value commensurate with the action direction and magnitude of the axial load (the direction and magnitude of the relative displacement). Therefore, based on this phase difference ratio, the direction and magnitude of the axial load (the direction and magnitude of the relative displacement) can be determined. The processing for obtaining these is performed by an arithmetic unit (not shown). For this reason, in the memory of this computing unit, an equation or a formula representing the relationship (zero point and gain) between the phase difference ratio and the relative displacement or load in the axial direction, which has been examined in advance by theoretical calculation or experiment. Remember the map.

上述した先発明の構造の場合には、エンコーダ４の被検出面にその検出部を対向させるセンサ（センサモジュール）の数を、２個としている。これに対し、特許文献２〜３及び特願２００６−３４５８４９には、当該センサ（センサモジュール）の数を３個以上に増やす（例えば、３個、４個、６個等に増やす）事で、多方向の変位或いは外力を求められる構造が記載されている。   In the case of the structure of the prior invention described above, the number of sensors (sensor modules) that make the detection unit face the detection surface of the encoder 4 is two. On the other hand, in Patent Documents 2-3 and Japanese Patent Application No. 2006-345849, by increasing the number of sensors (sensor modules) to 3 or more (for example, increasing to 3, 4, 6, etc.), A structure in which multi-directional displacement or external force is required is described.

ところで、上述の図７〜８に示した先発明の構造の様に、駆動輪支持用の転がり軸受ユニットを対象とし、且つ、外輪１の軸方向内端部にカバー８を介してセンサホルダ１０を支持固定する構造の場合、これらカバー８及びセンサホルダ１０の設置空間は、上記外輪１と、エンコーダ４と、等速ジョイント２７と、図示しないナックル等に設けた取付孔とにより周囲を囲まれた、環状の狭小空間となる。この為、上記センサホルダ１０の体積を余り大きくできない。特に、上述の図７〜８に示した先発明の構造の場合には、上記カバー８を上記センサホルダ１０の外殻部材とする様な構造を採用している。この為、このカバー８の板厚が、上記センサホルダ１０の体積をより小さくする要因になっている。従って、この様な図７〜８に示した先発明の構造の場合には、上記センサホルダ１０内に包埋するセンサモジュールの個数を６〜７個等と多くする場合に、これら各センサモジュールのレイアウトを適切にする事が、不可能ではないが困難になる可能性がある。   By the way, like the structure of the prior invention shown in FIGS. 7 to 8 described above, the sensor holder 10 is intended for the rolling bearing unit for supporting the driving wheel and the inner end of the outer ring 1 in the axial direction via the cover 8. In the structure for supporting and fixing the cover 8, the installation space of the cover 8 and the sensor holder 10 is surrounded by the outer ring 1, the encoder 4, the constant velocity joint 27, and a mounting hole provided in a knuckle (not shown) or the like. Moreover, it becomes an annular narrow space. For this reason, the volume of the sensor holder 10 cannot be increased too much. In particular, in the case of the structure of the prior invention shown in FIGS. 7 to 8 described above, a structure in which the cover 8 is an outer shell member of the sensor holder 10 is employed. For this reason, the plate thickness of the cover 8 is a factor for reducing the volume of the sensor holder 10. Therefore, in the case of the structure of the prior invention shown in FIGS. 7 to 8, when each of the sensor modules embedded in the sensor holder 10 is increased to 6 to 7 or the like, each of these sensor modules is used. Proper layout can be difficult if not impossible.

特開２００６−３１７４２０号公報JP 2006-317420 A 特開２００６−３２２９２８号公報JP 2006-322928 A 特開２００７−９３５８０号公報JP 2007-93580 A

本発明の転がり軸受ユニットの状態量測定装置は、上述の様な事情に鑑み、駆動輪用の転がり軸受ユニットを対象とすると共に、外輪の軸方向内端部にカバーを介してセンサホルダを支持固定し、しかもこのセンサホルダ内に包埋するセンサモジュールの個数を６〜７個等と多くする場合でも、これら各センサモジュールのレイアウトを適切にする事が容易となる構造を実現すべく発明したものである。   In view of the above-described circumstances, the rolling bearing unit state quantity measuring device of the present invention is intended for a rolling bearing unit for a drive wheel and supports a sensor holder via a cover at an axial inner end of the outer ring. Even when the number of sensor modules to be fixed and embedded in the sensor holder is increased to 6 to 7 or the like, the invention has been invented to realize a structure that makes it easy to make the layout of each sensor module appropriate. Is.

本発明の転がり軸受ユニットの状態量測定装置は、転がり軸受ユニットと、状態量測定装置とを備える。
このうちの転がり軸受ユニットは、内周面に複列の外輪軌道を有し、使用時にも回転しない外輪と、外周面に複列の内輪軌道を有し、使用時に回転する内輪相当部材と、これら両内輪軌道と上記両外輪軌道との間に、各列毎にそれぞれ複数個ずつ転動自在に設けられた転動体とを備える。
又、上記状態量測定装置は、エンコーダと、複数個のセンサと、演算器とを備える。
このうちのエンコーダは、上記内輪相当部材の軸方向一端部にこの内輪相当部材と同心に支持固定されたものであって、この内輪相当部材と同心の被検出面を備え、この被検出面の特性を円周方向に関して交互に変化させている。
又、上記各センサはそれぞれ、検出部を上記被検出面に対向させた状態で、上記外輪の軸方向一端部に支持固定された金属製で円環状のカバーに対し、合成樹脂製のセンサホルダを介して支持され、上記被検出面の特性変化に対応して出力信号を変化させる。
又、上記演算器は、上記各センサのうちの少なくとも一部のセンサの出力信号に基づいて、上記内輪相当部材の回転速度と、上記外輪とこの内輪相当部材との間の相対変位と、これら外輪と内輪相当部材との間に作用する外力とのうちの、少なくともこの相対変位又は外力を含む、１種類以上の状態量を算出する機能を有する。
又、上記センサホルダは、合成樹脂の射出成形により造ったもので、この射出成形に伴って、上記各センサを包埋支持すると共に上記カバーに対し一体的に結合している。 The rolling bearing unit state quantity measuring apparatus of the present invention includes a rolling bearing unit and a state quantity measuring apparatus.
Of these, the rolling bearing unit has an outer ring that has a double row outer ring raceway on the inner peripheral surface and does not rotate even when used, and an inner ring equivalent member that has a double row inner ring raceway on the outer peripheral surface and rotates when used, A plurality of rolling elements are provided between each of the inner ring raceways and the outer ring raceways so as to be capable of rolling in each row.
The state quantity measuring device includes an encoder, a plurality of sensors, and a calculator.
Of these, the encoder is supported and fixed concentrically with the inner ring equivalent member at one end in the axial direction of the inner ring equivalent member, and has a detected surface concentric with the inner ring equivalent member. The characteristics are alternately changed in the circumferential direction.
In addition, each of the sensors has a sensor holder made of a synthetic resin with respect to a metal and annular cover supported and fixed to one end portion in the axial direction of the outer ring with the detection portion facing the detection surface. The output signal is changed corresponding to the change in the characteristics of the detected surface.
Further, the computing unit is configured to determine the rotational speed of the inner ring equivalent member, the relative displacement between the outer ring and the inner ring equivalent member, based on the output signals of at least some of the sensors. It has a function of calculating one or more kinds of state quantities including at least the relative displacement or the external force out of the external force acting between the outer ring and the inner ring equivalent member.
The sensor holder is made by injection molding of a synthetic resin. In association with the injection molding, the sensors are embedded and supported and are integrally coupled to the cover.

特に、本発明の転がり軸受ユニットの状態量測定装置の場合には、上記カバーの円周方向複数個所に、それぞれ透孔を形成している。これと共に、それぞれが上記各センサに複数本ずつのセンサリードを接続して成る、複数個のセンサモジュールを、それぞれ上記各透孔のうちの何れかの透孔の内側に配置している。そして、この状態で、上記各センサモジュールを上記センサホルダ内に包埋支持すると共に、このセンサホルダの一部を上記各透孔の内側に密に進入させて、これら各透孔を塞いでいる。
尚、本発明を実施する場合、上記カバーに形成する上記各透孔の個数、位置、大きさ等は、上記センサホルダ内での上記各センサモジュールのレイアウトを適切にできる様に、適宜決定する。
この様な特徴を有する本発明を実施する場合に、好ましくは、請求項２に記載した様に、上記カバーに形成した各透孔の周縁部分を、上記センサホルダ内に包埋する。 In particular, in the case of the state quantity measuring device for a rolling bearing unit according to the present invention, through holes are respectively formed at a plurality of locations in the circumferential direction of the cover. At the same time, a plurality of sensor modules each formed by connecting a plurality of sensor leads to each of the sensors is arranged inside any one of the through holes. In this state, each of the sensor modules is embedded and supported in the sensor holder, and a part of the sensor holder is made to enter the inside of the through holes so as to block the through holes. .
In carrying out the present invention, the number, position, size, etc. of each through-hole formed in the cover are determined as appropriate so that the layout of the sensor module in the sensor holder can be made appropriate. .
When carrying out the present invention having such characteristics, preferably, as described in claim 2, the peripheral portion of each through hole formed in the cover is embedded in the sensor holder.

又、上述の様な請求項１〜２に記載した発明を実施する場合に、好ましくは、請求項３に記載した様に、上記カバーと、上記内輪相当部材若しくはこの内輪相当部材に結合固定されてこの内輪相当部材と共に回転する回転部材との間に、上記エンコーダを設置した空間を外部空間から遮断するシールリングを、全周に亙って設ける。これと共に、上記カバーを、金属板製で、上記外輪の軸方向一端部に嵌合固定する為の大径円筒部と、軸方向に関してこの大径円筒部よりも上記外輪と反対側に存在し、その内周面を上記シールリングを構成する弾性材の先端縁を全周に亙って摺接させる為のシール摺接面とした小径円筒部と、この小径円筒部と上記大径円筒部との互いに近い側の軸方向端部同士を連結する連結部とを備え、この連結部の円周方向複数個所にそれぞれ上記透孔を形成したものとする。   In carrying out the invention described in claims 1 and 2 as described above, preferably, as described in claim 3, the cover and the inner ring equivalent member or the inner ring equivalent member are coupled and fixed. A seal ring that blocks the space in which the encoder is installed from the external space is provided over the entire circumference between the rotary member that rotates together with the inner ring equivalent member. At the same time, the cover is made of a metal plate, and has a large-diameter cylindrical portion for fitting and fixing to one end portion in the axial direction of the outer ring, and exists on the opposite side of the outer ring from the large-diameter cylindrical portion in the axial direction. A small-diameter cylindrical portion whose inner peripheral surface is a seal-sliding contact surface for sliding the entire end edge of the elastic material constituting the seal ring, and the small-diameter cylindrical portion and the large-diameter cylindrical portion And connecting portions that connect axial end portions on the sides close to each other, and the through holes are formed at a plurality of locations in the circumferential direction of the connecting portions.

又、上述の請求項１〜３に記載した発明を実施する場合には、例えば請求項４に記載した様に、上記転がり軸受ユニットを自動車の車輪支持用のハブユニットとする。そして、使用状態で上記外輪を自動車の懸架装置に支持し、上記内輪相当部材であるハブに、車輪を結合固定する。   Further, when the invention described in the first to third aspects is carried out, as described in the fourth aspect, for example, the rolling bearing unit is a hub unit for supporting a wheel of an automobile. In use, the outer ring is supported by a suspension device of the automobile, and the wheel is coupled and fixed to a hub which is the inner ring equivalent member.

上述の様に、本発明の転がり軸受ユニットの状態量測定装置の場合には、複数個のセンサモジュールをそれぞれ、カバーの円周方向複数個所に形成した何れかの透孔の内側に配置した状態で、センサホルダ内に包埋する。この為、本発明によれば、駆動輪用の転がり軸受ユニットを対象とすると共に、外輪の軸方向内端部にカバーを介してセンサホルダを支持固定し、しかも上記センサモジュールの個数を６〜７個と多くする場合でも、上記カバーの存在に拘らず、上記各センサモジュールを、空間的な余裕を持って、適切なレイアウトで容易に配置できる。尚、この空間的な余裕を無くす限界設計を行なえば、その分だけ、上記センサホルダの小型化を図れる。
又、本発明の場合には、上記カバーに対し上記センサホルダを一体的に結合した状態で、このカバーに形成した上記各透孔を塞ぐべく、これら各透孔の内側に上記センサホルダの一部を密に進入（係合）させている。この為、上記カバーに対するこのセンサホルダの結合強度を大きくでき、これらカバーとセンサホルダとの間のあらゆる方向に関する相対変位を有効に防止できる。特に、請求項２に記載した構成を採用すれば、上記結合強度をより大きくできる為、上記相対変位をより有効に防止できる。
又、請求項３に記載した構成を採用すれば、シールリングにより、エンコーダを設置した空間を外部空間から遮断できる。これと共に、上記シールリングを構成する弾性材の先端縁を摺接させる為のシール摺接面を備えたカバーを、加工が容易な形状に構成できる。この為、このカバーの製造コストを抑えられる。 As described above, in the case of the rolling bearing unit state quantity measuring apparatus of the present invention, a state in which a plurality of sensor modules are respectively arranged inside any through holes formed at a plurality of positions in the circumferential direction of the cover. Then, it is embedded in the sensor holder. For this reason, according to the present invention, the rolling bearing unit for the drive wheel is a target, the sensor holder is supported and fixed to the inner end of the outer ring in the axial direction via the cover, and the number of the sensor modules is six to six. Even when the number is increased to seven, the sensor modules can be easily arranged in a suitable layout with a sufficient space regardless of the presence of the cover. If the limit design is made to eliminate this spatial margin, the sensor holder can be reduced in size accordingly.
Further, in the case of the present invention, in a state where the sensor holder is integrally coupled to the cover, the sensor holder is placed inside the through holes so as to close the through holes formed in the cover. The parts are closely entered (engaged). For this reason, the coupling strength of the sensor holder with respect to the cover can be increased, and relative displacement in any direction between the cover and the sensor holder can be effectively prevented. In particular, if the configuration described in claim 2 is adopted, the above-mentioned relative displacement can be more effectively prevented since the above-mentioned bond strength can be increased.
If the configuration described in claim 3 is adopted, the space where the encoder is installed can be blocked from the external space by the seal ring. At the same time, the cover provided with the seal sliding contact surface for sliding the tip end edge of the elastic material constituting the seal ring can be formed into a shape that can be easily processed. For this reason, the manufacturing cost of this cover can be suppressed.

図１〜６は、請求項１〜４に対応する、本発明の実施の形態の１例を示している。尚、本例の特徴は、７個のセンサモジュール３６ｓ1 〜３６ｓ7 を包埋した合成樹脂製のセンサホルダ１０ａ、並びに、このセンサホルダ１０ａを保持する金属板製のカバー８ａの構造にある。その他の部分の構造及び作用は、基本的には、前述の図７〜８に示した先発明の構造の場合と同様であるから、同等部分に関する重複する図示並びに説明は省略若しくは簡略にし、以下、本例の特徴部分、並びに、上記先発明の構造と異なる部分を中心に説明する。 1 to 6 show an example of an embodiment of the present invention corresponding to claims 1 to 4. The feature of this example is the structure of a sensor holder 10a made of synthetic resin in which seven sensor modules 36s 1 to 36s 7 are embedded, and a cover 8a made of a metal plate that holds the sensor holder 10a. Since the structure and operation of other parts are basically the same as those of the structure of the prior invention shown in FIGS. 7 to 8 described above, overlapping illustrations and explanations of equivalent parts are omitted or simplified. The description will focus on the characteristic part of the present example and the part different from the structure of the previous invention.

本例の場合、図１、２、３、５に示す様に、上記金属板製のカバー８ａは、断面クランク形で全体を円環状に形成している。この様なカバー８ａは、第一円筒部３０と、この第一円筒部３０の軸方向内端部から径方向内方に向け直角に折れ曲がった第一円輪部３１と、この第一円輪部３１の径方向内端部から軸方向内方に向け直角に折れ曲がった第二円筒部３２と、この第二円筒部３２の軸方向内端部から径方向内方に向け直角に折れ曲がった第二円輪部３３と、この第二円輪部３３の径方向内端部から軸方向内方に向け直角に折れ曲がった第三円筒部３４とを備える。これら各部位のうち、上記第一円筒部３０が、特許請求の範囲の請求項３に記載した「大径円筒部」に相当し、上記第三円筒部３４が、同じく「小径円筒部」に相当し、上記第一円輪部３１と第二円筒部３２と第二円輪部３３とが、同じく「連結部」に相当する。   In the case of this example, as shown in FIGS. 1, 2, 3, and 5, the cover 8a made of a metal plate has a crank shape in cross section and is formed in an annular shape as a whole. Such a cover 8a includes a first cylindrical portion 30, a first annular portion 31 bent at a right angle from the inner end in the axial direction of the first cylindrical portion 30 toward the inner side in the radial direction, and the first annular portion. The second cylindrical portion 32 bent at a right angle from the radially inner end portion of the portion 31 toward the axially inward direction, and the second cylindrical portion 32 bent at a right angle from the axial inner end portion of the second cylindrical portion 32 toward the radially inward direction. A two-circular ring portion 33 and a third cylindrical portion 34 bent at a right angle from the radially inner end portion of the second circular ring portion 33 toward the inner side in the axial direction are provided. Among these portions, the first cylindrical portion 30 corresponds to the “large-diameter cylindrical portion” described in claim 3 of the claims, and the third cylindrical portion 34 similarly corresponds to the “small-diameter cylindrical portion”. The first annular portion 31, the second cylindrical portion 32, and the second annular portion 33 correspond to the “connecting portion”.

更に、本例の場合、上記カバー８ａの軸方向中間部（上記第一円輪部３１の径方向中間部から上記第二円輪部３３の径方向内端寄り部までの間部分）に、３個の大透孔３５ａ、３５ａ及び６個の小透孔３５ｂ、３５ｂを、それぞれ円周方向に関して等間隔に形成している。具体的には、円周方向等間隔の３個所に、それぞれ上記各大透孔３５ａ、３５ａを１個ずつ形成し、且つ、円周方向に関してこれら各大透孔３５ａ、３５ａ同士の間部分に、それぞれ上記各小透孔３５ｂ、３５ｂを２個ずつ形成している。軸方向及び径方向から見た、上記各大透孔３５ａ、３５ａ及び上記各小透孔３５ｂ、３５ｂの形状は、それぞれ略矩形としている。又、円周方向に関する上記各大透孔３５ａ、３５ａの幅寸法は、同じく上記各小透孔３５ｂ、３５ｂの幅寸法の、約２倍の大きさとしている。   Furthermore, in the case of this example, in the axial middle portion of the cover 8a (the portion between the radial middle portion of the first annular portion 31 and the radially inner end portion of the second annular portion 33), Three large through holes 35a and 35a and six small through holes 35b and 35b are formed at equal intervals in the circumferential direction. Specifically, each of the large through holes 35a, 35a is formed at three points at equal intervals in the circumferential direction, and at the portion between the large through holes 35a, 35a in the circumferential direction. Each of the small through holes 35b and 35b is formed two by two. The shapes of the large through holes 35a and 35a and the small through holes 35b and 35b viewed from the axial direction and the radial direction are substantially rectangular. Further, the width dimension of each of the large through holes 35a and 35a in the circumferential direction is approximately twice as large as the width dimension of each of the small through holes 35b and 35b.

又、本例の場合、図１、６に示す様に、前記７個のセンサモジュール３６ｓ1 （３６ｓ2 〜３６ｓ7 ）はそれぞれ、センサ９ｓ1 （９ｓ2 〜９ｓ7 ）に対し、互いに平行に配置した２本のセンサリード３７、３７の基端部を接続して成る。これら両センサリード３７、３７の中間部には、これら両センサリード３７、３７同士の接触を防止する為の絶縁部材３８を組み付けている。尚、本発明を実施する場合、上記各センサリード３７、３７の形状は、特に問わない。本例の場合には、２つの形状例を示す為に、便宜上、図１、２に示したセンサリード３７の形状（クランク形状）と、図６に示したセンサリード３７、３７の形状（直線形状）とを異ならせている。何れにしても、本例の場合、上記７個のセンサモジュール３６ｓ1 〜３６ｓ7 のうちの、６個のセンサモジュール３６ｓ1 〜３６ｓ6 を構成する各センサ９ｓ1 〜９ｓ6 の出力信号は、それぞれ外輪１とハブ２（図７参照）との間の相対変位や、これら外輪１とハブ２との間に作用する外力を測定する為に利用する。これに対し、残り１個のセンサモジュール３６ｓ7 を構成するセンサ９ｓ7 の出力信号は、上記ハブ２に支持固定する車輪の回転速度を測定する為（ＡＢＳ制御用）に利用する。 And in this embodiment, as shown in FIG. 1 and 6, each of the seven sensor module 36s 1 (36s 2 ~36s 7), compared sensors 9s 1 (9s 2 ~9s 7) , parallel to each other The base end portions of the two arranged sensor leads 37 and 37 are connected. An insulating member 38 for preventing contact between the two sensor leads 37, 37 is assembled at an intermediate portion between the two sensor leads 37, 37. When the present invention is carried out, the shape of each of the sensor leads 37, 37 is not particularly limited. In this example, for the sake of convenience, the shape of the sensor lead 37 (crank shape) shown in FIGS. 1 and 2 and the shape of the sensor leads 37 and 37 shown in FIG. Shape). In any case of this embodiment, the output signals of the sensors 9s 1 ~9s 6 that the constitute six sensor module 36s 1 ~36s 6 of the seven sensor module 36s 1 ~36s 7 is Each is used to measure the relative displacement between the outer ring 1 and the hub 2 (see FIG. 7) and the external force acting between the outer ring 1 and the hub 2. In contrast, the output signal of the sensor 9s 7 constituting the remaining one sensor module 36 s 7 is utilized to measure the rotational speed of the wheel to be supported by and fixed to the hub 2 (for ABS control).

更に、本例の場合、図６に詳示する様に、上記７個のセンサモジュール３６ｓ1 〜３６ｓ7 を構成する各センサリード３７、３７の先端部を、それぞれ円環状のバスバー３９に接続している。この状態で、上記各センサ９ｓ1 〜９ｓ7 同士の位置関係は、使用状態での位置関係になっている。又、上記バスバー３９の両端部を、それぞれハーネス１７（図１）の端部に接続している。これにより、使用時に、上記各センサリード３７、３７及び上記バスバー３９及び上記ハーネス１７を通じて、上記各センサ９ｓ1 〜９ｓ7 の出力信号を、それぞれ上記相対変位や外力を算出する機能を有する演算器や、ＡＢＳコントローラ等に送れる様にしている。 Further, in this example, as shown in detail in FIG. 6, the tip portions of the sensor leads 37, 37 constituting the seven sensor modules 36 s 1 to 36 s 7 are connected to the annular bus bar 39. ing. In this state, the positional relationship between the sensors 9s 1 to 9s 7 is the positional relationship in use. Further, both end portions of the bus bar 39 are respectively connected to end portions of the harness 17 (FIG. 1). Thus, when used, the arithmetic unit having a function of calculating the relative displacement and the external force from the output signals of the sensors 9s 1 to 9s 7 through the sensor leads 37 and 37, the bus bar 39 and the harness 17, respectively. It can be sent to an ABS controller or the like.

又、本例の場合、図１、３、４に示す様に、前記合成樹脂製のセンサホルダ１０ａは、全体が略円筒状である。この様なセンサホルダ１０ａは、射出成形により造る事に伴い、上記７個のセンサモジュール３６ｓ1 〜３６ｓ7 及び上記バスバー３９及び上記ハーネス１７の端部を包埋支持している。これと共に、上記カバー８ａに形成した大小各透孔３５ａ、３５ｂを密に塞ぎ、且つ、これら大小各透孔３５ａ、３５ｂの周縁部分のほぼ全体（径方向内端部を除く部分）を、図１のＡ部に示す様に包埋した状態で、上記カバー８ａに対して一体的に結合している。即ち、上述の様なセンサホルダ１０ａは、上記カバー８ａの外面に添設する状態で、このカバー８ａの外部に設けられた、上記センサホルダ１０ａの大部分を占める主部４０を備える。これと共に、上記大小各透孔３５ａ、３５ｂの内側を密に埋める（内側に密に進入する）状態で、これら大小各透孔３５ａ、３５ｂの内側部分に設けられた、塞ぎ部４１ａ、４１ｂを備える。更には、これら各塞ぎ部４１ａ、４１ｂを介して上記主部４０に連結された状態で、上記カバー８ａの内部に設けられた、副部４２ａ、４２ｂを備える。これら各部位のうち、上記主部４０の外径は、上記カバー８ａを構成する第一円筒部３０の外径よりも小さくしている。又、上記各副部４２ａ、４２ｂのうち、上記各大透孔３５ａ、３５ａに対応する部分に存在する３つの副部４２ａ、４２ａの軸方向外端面は、上記各小透孔３５ｂ、３５ｂに対応する部分に存在する６つの副部４２ｂ、４２ｂの軸方向外端面よりも、軸方向外方に存在させている。 In the case of this example, as shown in FIGS. 1, 3, and 4, the synthetic resin sensor holder 10a is generally cylindrical. Such sensor holder 10a is, with the possible build by injection molding, are embedded supports the end of the seven sensor module 36s 1 ~36s 7 and the bus bar 39 and the harness 17. At the same time, the large and small through holes 35a and 35b formed in the cover 8a are tightly closed, and almost the entire peripheral edge portion of the large and small through holes 35a and 35b (excluding the radially inner end portion) is shown in FIG. In the embedded state as shown in part A of 1, the cover 8a is integrally coupled. That is, the sensor holder 10a as described above includes a main portion 40 that occupies most of the sensor holder 10a provided outside the cover 8a in a state of being attached to the outer surface of the cover 8a. At the same time, in the state where the inside of each of the large and small through holes 35a and 35b is densely filled (closely enters inside), the blocking portions 41a and 41b provided in the inner portions of the large and small through holes 35a and 35b are provided. Prepare. Furthermore, it has sub-parts 42a and 42b provided inside the cover 8a in a state of being connected to the main part 40 through the respective blocking parts 41a and 41b. Among these portions, the outer diameter of the main portion 40 is smaller than the outer diameter of the first cylindrical portion 30 constituting the cover 8a. In addition, among the sub-parts 42a and 42b, the axially outer end surfaces of the three sub-parts 42a and 42a existing in the portions corresponding to the large through-holes 35a and 35a are connected to the small through-holes 35b and 35b. The six sub-parts 42b and 42b existing in the corresponding parts are located outward in the axial direction from the axially outer end surfaces.

又、本例の場合、上記７個のセンサモジュール３６ｓ1 〜３６ｓ7 は、それぞれの中間部を、上記大小各透孔３５ａ、３５ｂのうちの何れかの透孔の内側に配置すると共に、それぞれのセンサ９ｓ1 〜９ｓ7 を、上記カバー８ａ内に配置した状態で、上記センサホルダ１０ａ内に包埋支持している。具体的には、図２、５に示す様に、上述した相対変位や外力を測定する為に使用する６個のセンサモジュール３６ｓ1 〜３６ｓ6 を、上記各大透孔３５ａ、３５ａの内側にそれぞれ２個ずつ配置すると共に、上述した回転速度を測定する為の１個のセンサモジュール３６ｓ7 を、上記各小透孔３５ｂ、３５ｂのうちの１個の小透孔３５ｂの内側に配置している。又、上記バスバー３９及び上記ハーネス１７の端部は、上記センサホルダ１０ａを構成する主部４０内に包埋支持している。 In the case of this example, the seven sensor modules 36s 1 to 36s 7 are arranged such that their intermediate portions are disposed inside any one of the large and small through holes 35a and 35b, respectively. The sensors 9s 1 to 9s 7 are embedded and supported in the sensor holder 10a in a state of being arranged in the cover 8a. Specifically, as shown in FIGS. 2 and 5, the six sensor modules 36 s 1 to 36 s 6 used for measuring the relative displacement and external force described above are placed inside the large through holes 35 a and 35 a. Two sensor modules 36s 7 for measuring the rotational speed described above are arranged inside each one small through hole 35b of the small through holes 35b, 35b. Yes. Further, the end portions of the bus bar 39 and the harness 17 are embedded and supported in the main portion 40 constituting the sensor holder 10a.

尚、以上に述べた様なセンサホルダ１０ａを保持したカバー８ａを造る際には、先ず、このカバー８ａと、上記７個のセンサモジュール３６ｓ1 〜３６ｓ7 と、上記バスバー３９と、上記ハーネス１７の端部とを、それぞれ射出成形装置のキャビティ内の所定位置に保持する。そして、この状態で、このキャビティ内に合成樹脂を射出成形する事で、上記センサホルダ１０ａを完成させる。 Note that when making the cover 8a for holding the sensor holder 10a such as described above, first, the cover 8a, and the seven sensor module 36s 1 ~36s 7, and the bus bar 39, the harness 17 Are respectively held at predetermined positions in the cavity of the injection molding apparatus. In this state, the sensor holder 10a is completed by injection molding synthetic resin into the cavity.

上述の様なセンサホルダ１０ａを保持したカバー８ａを、外輪１（図７参照）の軸方向内端部に支持固定する場合には、この外輪１の外周面の軸方向内端部に設けた嵌合用小径部１６に、上記カバー８ａを構成する第一円筒部３０を、締り嵌めで外嵌固定する。これと共に、このカバー８ａを構成する第一円輪部３１の軸方向外側面の径方向外半部を、上記外輪１の軸方向内端面に当接させる事により、この外輪１に対する、上記カバー８ａの軸方向の位置決めを図る。又、この状態で、上述した相対変位や外力を測定する為に使用する６個のセンサ９ｓ1 〜９ｓ6 のうちの、３個のセンサ９ｓ1 、９ｓ3 、９ｓ5 の検出部を、被検出面である、エンコーダ４（図７〜８参照）の外周面の軸方向外半部に、残り３個のセンサ９ｓ2 、９ｓ4 、９ｓ6 の検出部を、この被検出面の軸方向内半部に、それぞれ近接対向させる。これと共に、上述した回転速度を測定する為の１個のセンサ９ｓ7 の検出部を、上記被検出面の軸方向中間部に近接対向させる。更に、この状態で、上記エンコーダ４の軸方向内端部に外嵌固定したシールリング２１を構成する弾性材２３（図７参照）の先端部を、上記カバー８ａを構成する第三円筒部３４の内周面に、全周に亙り摺接させる。 When the cover 8a holding the sensor holder 10a as described above is supported and fixed to the inner end of the outer ring 1 (see FIG. 7) in the axial direction, the cover 8a is provided at the inner end of the outer ring 1 in the axial direction. The first cylindrical portion 30 constituting the cover 8a is externally fixed to the fitting small diameter portion 16 by an interference fit. At the same time, by bringing the radially outer half of the axially outer side surface of the first annular portion 31 constituting the cover 8a into contact with the axially inner end surface of the outer ring 1, the cover for the outer ring 1 is provided. Positioning in the axial direction of 8a is attempted. In this state, among the six sensors 9s 1 to 9s 6 used for measuring the relative displacement and the external force described above, the detection units of the three sensors 9s 1 , 9s 3 and 9s 5 are covered. The remaining three sensors 9 s 2 , 9 s 4 , and 9 s 6 are connected to the outer half of the outer peripheral surface of the encoder 4 (see FIGS. 7 to 8), which is the detection surface, in the axial direction of the detected surface. The inner half is made to face each other in proximity. At the same time, the detection part of one sensor 9s 7 for measuring the rotational speed described above is brought close to and opposed to the axially intermediate part of the detected surface. Further, in this state, the distal end portion of the elastic material 23 (see FIG. 7) constituting the seal ring 21 fitted and fixed to the inner end portion in the axial direction of the encoder 4 is used as the third cylindrical portion 34 constituting the cover 8a. Slidably contact the inner peripheral surface of the entire circumference.

上述の様に、本例の転がり軸受ユニットの状態量測定装置の場合には、７個のセンサモジュール３６ｓ1 〜３６ｓ7 の中間部をそれぞれ、カバー８ａの円周方向９個所に形成した大小各透孔３５ａ、３５ｂのうちの何れかの透孔の内側に配置した状態で、センサホルダ１０ａ内に包埋支持する。この為、本例の場合には、駆動輪用の転がり軸受ユニットを対象とすると共に、外輪１（図７参照）の軸方向内端部にカバー８ａを介してセンサホルダ１０ａを支持固定し、しかも上記センサモジュール３６ｓ1 〜３６ｓ7 の個数を７個と多くする構造でありながら、上記カバー８ａの存在に拘らず、上記各センサモジュール３６ｓ1 〜３６ｓ7 を、空間的な余裕を持って、適切なレイアウトで容易に配置できる。 As described above, in the case of the state measuring apparatus for a rolling bearing unit of the present embodiment, each seven middle portion of the sensor module 36s 1 ~36s 7, each magnitude is formed in the circumferential direction 9 positions of the cover 8a The sensor holder 10a is embedded and supported in a state of being disposed inside any one of the through holes 35a and 35b. Therefore, in the case of this example, the rolling bearing unit for the drive wheel is the target, and the sensor holder 10a is supported and fixed to the axially inner end of the outer ring 1 (see FIG. 7) via the cover 8a. Moreover yet structure to increase the seven the number of the sensor module 36s 1 ~36s 7, regardless of the presence of the cover 8a, the respective sensor module 36s 1 ~36s 7, with spatial allowance, Can be easily arranged with an appropriate layout.

又、本例の場合には、上記カバー８ａに対し上記センサホルダ１０ａを一体的に結合した状態で、このカバー８ａに形成した上記大小各透孔３５ａ、３５ｂを塞ぐべく、これら大小各透孔３５ａ、３５ｂの内側に、それぞれ上記センサホルダ１０ａを構成する塞ぎ部４１ａ、４１ｂの一部を密に進入（係合）させている。これと共に、上記大小各透孔３５ａ、３５ｂの周縁部分のほぼ全体（径方向内端部を除く部分）を、図１のＡ部に示す様に、上記センサホルダ１０ａ内に包埋している。この為、上記カバー８ａに対するこのセンサホルダ１０ａの結合強度を十分に大きくでき、これらカバー８ａとセンサホルダ１０ａとの間の、あらゆる方向に関する相対変位を有効に防止できる。   In the case of this example, the large and small through holes 35a and 35b formed in the cover 8a are closed in a state where the sensor holder 10a is integrally coupled to the cover 8a. A part of the blocking portions 41a and 41b constituting the sensor holder 10a is made to enter (engage) densely inside 35a and 35b, respectively. At the same time, almost the entire peripheral portion of each of the large and small through holes 35a and 35b (the portion excluding the radially inner end portion) is embedded in the sensor holder 10a as shown in part A of FIG. . For this reason, the coupling strength of the sensor holder 10a with respect to the cover 8a can be sufficiently increased, and relative displacement in any direction between the cover 8a and the sensor holder 10a can be effectively prevented.

又、本例の場合には、上記カバー８ａの断面形状をクランク形としている。この為、前述の図７に示した先発明の構造に組み付けたカバー８の様に、軸方向内半部の断面形状がコ字形であるものに比べて、上記カバー８ａを造る際の金属板の加工を容易に行なえる。この為、このカバー８ａの製造コストを抑えられる。
尚、本発明を実施する場合、カバーに形成する複数個の透孔の具体的な個数、位置、形状、寸法等はそれぞれ、複数個のセンサモジュールの具体的な個数、配置個所、形状、寸法等に応じて、適宜決定する。 In the case of this example, the cross-sectional shape of the cover 8a is a crank shape. For this reason, compared to the cover 8 assembled in the structure of the prior invention shown in FIG. 7 described above, the metal plate used when the cover 8a is made as compared with the case where the cross-sectional shape of the axially inner half is U-shaped. Can be easily processed. For this reason, the manufacturing cost of this cover 8a can be suppressed.
When implementing the present invention, the specific number, position, shape, dimensions, etc. of the plurality of through holes formed in the cover are the specific number, location, shape, dimensions of the plurality of sensor modules, respectively. It is determined appropriately according to the above.

本発明の実施の形態の１例を示す、複数個のセンサモジュールを包埋したセンサホルダ及びカバーの断面図。Sectional drawing of the sensor holder and the cover which embedded the some sensor module which shows an example of embodiment of this invention. カバーと複数個のセンサモジュールのみを取り出して示す、図１の左方から見た図。The figure seen from the left of FIG. 1 which takes out and shows only a cover and several sensor modules. 複数個のセンサモジュールを包埋したセンサホルダ及びカバーの斜視図。The perspective view of the sensor holder and the cover which embedded the some sensor module. センサホルダのみを取り出して示す斜視図。The perspective view which takes out and shows only a sensor holder. カバーと複数個のセンサモジュールのみを取り出して示す斜視図。The perspective view which takes out and shows only a cover and several sensor modules. 複数個のセンサモジュール及び欠円環状のバスバーのみを取り出して示す斜視図。FIG. 5 is a perspective view showing only a plurality of sensor modules and a notched annular bus bar. 転がり軸受ユニットの状態量測定装置に関する先発明の構造の１例を示す断面図。Sectional drawing which shows one example of the structure of the prior invention regarding the state quantity measuring apparatus of a rolling bearing unit. エンコーダの被検出面の一部を径方向から見た図。The figure which looked at a part of the to-be-detected surface of an encoder from radial direction.

符号の説明Explanation of symbols

１ 外輪
２ ハブ
３ 転動体
４ エンコーダ
５ 芯金
６ エンコーダ本体
７ 内輪
８、８ａ カバー
９ａ、９ｂ、９ｓ1 〜９ｓ7 センサ
１０、１０ａ センサホルダ
１１ 大径円筒部
１２ 円輪部
１３ 小径円筒部
１４ 取付フランジ
１５ 取付用円筒面
１６ 嵌合用小径部
１７ ハーネス
１８ 通孔
１９ 小径部
２０ 空間
２１ シールリング
２２ 芯金
２３ 弾性材
２４ 空間
２５ 組み合わせシールリング
２６ スプライン孔
２７ 等速ジョイント
２８ スプライン軸
２９ ボルト
３０ 第一円筒部
３１ 第一円輪部
３２ 第二円筒部
３３ 第二円輪部
３４ 第三円筒部
３５ａ 大透孔
３５ｂ 小透孔
３６ｓ1 〜３６ｓ7 センサモジュール
３７ センサリード
３８ 絶縁部材
３９ バスバー
４０ 主部
４１ａ、４１ｂ 塞ぎ部
４２ａ、４２ｂ 副部 1 the outer ring 2 hub 3 rolling element 4 encoder 5 core metal 6 encoder main body 7 an inner ring 8,8a cover 9a, 9b, 9s 1 ~9s 7 sensor 10,10a sensor holder 11 large-diameter cylindrical portion 12 circular ring portion 13 small-diameter cylindrical portion 14 Mounting flange 15 Mounting cylindrical surface 16 Small diameter portion 17 for fitting 17 Harness 18 Through hole 19 Small diameter portion 20 Space 21 Seal ring 22 Core metal 23 Elastic material 24 Space 25 Combination seal ring 26 Spline hole 27 Constant velocity joint 28 Spline shaft 29 Bolt 30 First cylindrical portion 31 First annular portion 32 Second cylindrical portion 33 Second annular portion 34 Third cylindrical portion 35a Large through hole 35b Small through hole 36s 1 to 36s 7 Sensor module 37 Sensor lead 38 Insulating member 39 Bus bar 40 Main part 41a, 41b Blocking part 42a, 42b Sub part

Claims (4)

転がり軸受ユニットと、状態量測定装置とを備え、
このうちの転がり軸受ユニットは、内周面に複列の外輪軌道を有し、使用時にも回転しない外輪と、外周面に複列の内輪軌道を有し、使用時に回転する内輪相当部材と、これら両内輪軌道と上記両外輪軌道との間に、各列毎にそれぞれ複数個ずつ転動自在に設けられた転動体とを備えたものであり、
上記状態量測定装置は、エンコーダと、複数個のセンサと、演算器とを備え、
このうちのエンコーダは、上記内輪相当部材の軸方向一端部にこの内輪相当部材と同心に支持固定されたものであって、この内輪相当部材と同心の被検出面を備え、この被検出面の特性を円周方向に関して交互に変化させたものであり、
上記各センサはそれぞれ、検出部を上記被検出面に対向させた状態で、上記外輪の軸方向一端部に支持固定された金属製で円環状のカバーに対し、合成樹脂製のセンサホルダを介して支持され、上記被検出面の特性変化に対応して出力信号を変化させるものであり、
上記演算器は、上記各センサのうちの少なくとも一部のセンサの出力信号に基づいて、上記内輪相当部材の回転速度と、上記外輪とこの内輪相当部材との間の相対変位と、これら外輪と内輪相当部材との間に作用する外力とのうちの、少なくともこの相対変位又は外力を含む、１種類以上の状態量を算出する機能を有するものであり、
上記センサホルダは、合成樹脂の射出成形により造ったもので、この射出成形に伴って、上記各センサを包埋支持すると共に上記カバーに対し一体的に結合している
転がり軸受ユニットの状態量測定装置であって、
上記カバーの円周方向複数個所にそれぞれ透孔を形成すると共に、それぞれが上記各センサに複数本ずつのセンサリードを接続して成る、複数個のセンサモジュールを、それぞれ上記各透孔のうちの何れかの透孔の内側に配置した状態で、これら各センサモジュールを上記センサホルダ内に包埋支持すると共に、このセンサホルダの一部を上記各透孔の内側に密に進入させて、これら各透孔を塞いでいる事を特徴とする転がり軸受ユニットの状態量測定装置。 A rolling bearing unit and a state quantity measuring device;
Of these, the rolling bearing unit has an outer ring that has a double row outer ring raceway on the inner peripheral surface and does not rotate even when used, and an inner ring equivalent member that has a double row inner ring raceway on the outer peripheral surface and rotates when used, Between these inner ring raceways and the both outer ring raceways, a plurality of rolling elements are provided so as to be freely rollable for each row.
The state quantity measuring device includes an encoder, a plurality of sensors, and a calculator.
Of these, the encoder is supported and fixed concentrically with the inner ring equivalent member at one end in the axial direction of the inner ring equivalent member, and has a detected surface concentric with the inner ring equivalent member. The characteristics are alternately changed in the circumferential direction.
Each of the sensors has a detection part facing the detection surface, and a metallic and annular cover supported and fixed to one end in the axial direction of the outer ring via a synthetic resin sensor holder. The output signal is changed in response to the change in the characteristics of the detected surface.
Based on the output signals of at least some of the sensors, the calculator calculates the rotational speed of the inner ring equivalent member, the relative displacement between the outer ring and the inner ring equivalent member, the outer ring, Among the external forces acting with the inner ring equivalent member, it has a function of calculating one or more kinds of state quantities including at least this relative displacement or external force,
The sensor holder is made by injection molding of synthetic resin, and along with the injection molding, the sensors are embedded and supported, and the state quantity measurement of the rolling bearing unit is integrally coupled to the cover. A device,
A plurality of sensor modules, each having a plurality of sensor leads each formed by connecting a plurality of sensor leads to each of the sensors, are formed in a plurality of circumferential positions of the cover. The sensor modules are embedded and supported in the sensor holder in a state of being placed inside any of the through holes, and a part of the sensor holder is closely inserted into the through holes to An apparatus for measuring a state quantity of a rolling bearing unit, wherein each through hole is closed. カバーに形成した各透孔の周縁部分をセンサホルダ内に包埋している、請求項１に形成した転がり軸受ユニットの状態量測定装置。   The state quantity measuring device of the rolling bearing unit formed in Claim 1 which has embedded the peripheral part of each through-hole formed in the cover in the sensor holder. カバーと、内輪相当部材若しくはこの内輪相当部材に結合固定されてこの内輪相当部材と共に回転する回転部材との間に、エンコーダを設置した空間を外部空間から遮断するシールリングを、全周に亙って設けており、
上記カバーが、金属板製で、外輪の軸方向一端部に嵌合固定する為の大径円筒部と、軸方向に関してこの大径円筒部よりも上記外輪と反対側に存在し、その内周面を上記シールリングを構成する弾性材の先端縁を全周に亙って摺接させる為のシール摺接面とした小径円筒部と、この小径円筒部と上記大径円筒部との互いに近い側の軸方向端部同士を連結する連結部とを備え、この連結部の円周方向複数個所にそれぞれ透孔を形成している、
請求項１〜２のうちの何れか１項に記載した転がり軸受ユニットの状態量測定装置。 A seal ring that cuts off the space where the encoder is installed from the external space between the cover and the inner ring equivalent member or the rotating member that is coupled and fixed to the inner ring equivalent member and rotates together with the inner ring equivalent member is arranged over the entire circumference. Provided,
The cover is made of a metal plate, and has a large-diameter cylindrical portion for fitting and fixing to one end portion in the axial direction of the outer ring, and exists on the opposite side to the outer ring with respect to the large-diameter cylindrical portion in the axial direction. A small-diameter cylindrical portion whose surface is a sliding contact surface for sliding the entire end edge of the elastic material constituting the seal ring, and the small-diameter cylindrical portion and the large-diameter cylindrical portion are close to each other A connecting portion for connecting the axial end portions on the side, and through-holes are formed at a plurality of circumferential positions of the connecting portion, respectively.
The state quantity measuring device of the rolling bearing unit according to any one of claims 1 and 2. 転がり軸受ユニットが自動車の車輪支持用のハブユニットであり、使用状態で外輪が自動車の懸架装置に支持され、内輪相当部材であるハブに車輪が結合固定される、請求項１〜３のうちの何れか１項に記載した転がり軸受ユニットの状態量測定装置。   The rolling bearing unit is a hub unit for supporting a wheel of an automobile, the outer ring is supported by a suspension of the automobile in use, and the wheel is coupled and fixed to a hub that is an inner ring equivalent member. The state quantity measuring device of the rolling bearing unit described in any one of the items.
JP2007185355A 2007-07-17 2007-07-17 State quantity measuring device for rolling bearing units Expired - Fee Related JP5007616B2 (en)

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JP2011133380A (en) * 2009-12-25 2011-07-07 Ntn Corp Wheel bearing with sensor
CN108139240A (en) * 2015-10-27 2018-06-08 舍弗勒技术股份两合公司 With for providing the bearing arrangement of the built-in electric wiring of a variety of operating voltages
CN115451760A (en) * 2022-08-08 2022-12-09 湖南航天有限责任公司 Device for detecting moment of resistance between inner ring and outer ring of upper tail wing of missile

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CN115451760B (en) * 2022-08-08 2023-09-19 湖南航天有限责任公司 Device for detecting resistance moment between inner ring and outer ring of tail wing on bullet

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