JP2007198847A - Rolling bearing with rotation sensor - Google Patents

Rolling bearing with rotation sensor Download PDF

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Publication number
JP2007198847A
JP2007198847A JP2006016614A JP2006016614A JP2007198847A JP 2007198847 A JP2007198847 A JP 2007198847A JP 2006016614 A JP2006016614 A JP 2006016614A JP 2006016614 A JP2006016614 A JP 2006016614A JP 2007198847 A JP2007198847 A JP 2007198847A
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Prior art keywords
detected
origin
magnetized
magnetic
rotation
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Japanese (ja)
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Hiroyoshi Ito
浩義 伊藤
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006016614A priority Critical patent/JP2007198847A/en
Priority to PCT/JP2007/050959 priority patent/WO2007086363A1/en
Publication of JP2007198847A publication Critical patent/JP2007198847A/en
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    • 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
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
    • 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
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2454—Encoders incorporating incremental and absolute signals
    • G01D5/2455—Encoders incorporating incremental and absolute signals with incremental and absolute tracks on the same encoder
    • G01D5/2457—Incremental encoders having reference marks
    • 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
    • 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
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing with a rotation sensor free from a risk of detecting erroneously an origin of rotation in a rotary bearing ring, even when assembled in equipment of generating a magnetic field and used. <P>SOLUTION: A magnetic flux of a magnetic pole different from an origin detecting magnetic attractive part 9a is positively generated from a residual circumferential-directional portion 9b, by attracting magnetically the residual circumferential-directional portion 9b other than the origin detecting magnetic attractive part 9a attracted magnetically for detecting the origin in a circumferential-directional one portion of the second detected part 6b in a magnetic encoder 6, to a magnetic pole different from the magnetic pole of the origin detecting magnetic attractive part 9a, and the origin of the rotation in the rotary bearing ring is prevented from being detected erroneously, in the second sensor used assembledly in the equipment of generating the magnetic field, and for detecting a change of the magnetic flux from the the second detected part 6b even when a slight leakage magnetic flux passes the residual circumferential-directional portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、回転軌道輪の回転の原点を検出可能な回転センサ付き転がり軸受に関する。   The present invention relates to a rolling bearing with a rotation sensor capable of detecting the origin of rotation of a rotating raceway.

各種回転機器の回転軸等を支持する転がり軸受には、内外輪の軌道輪のうちの回転軌道輪に磁気エンコーダを装着し、固定軌道輪に磁気エンコーダの回転に伴う磁極の変化を検出するセンサ素子を装着して、回転軌道輪の回転を検出するようにした回転センサ付き転がり軸受がある。   A sensor that detects changes in magnetic poles associated with the rotation of a magnetic encoder on a fixed raceway, with a magnetic bearing attached to the rotary raceway of the inner and outer raceways. There is a rolling bearing with a rotation sensor in which an element is mounted to detect the rotation of a rotating race.

この回転センサ付き転がり軸受には、磁気エンコーダに同心のリング状で互いに隣接する第１および第２の被検出部を設け、第１の被検出部を円周方向で交互に異なる磁極に着磁するとともに、第２の被検出部を円周方向の１箇所で、回転軌道輪の回転の原点検出用に、いずれかの磁極に着磁し、この磁気エンコーダの第１および第２の被検出部からの各磁束の変化をそれぞれ検出する第１および第２のセンサ素子を固定軌道輪に装着して、第１のセンサ素子で回転軌道輪の回転速度（回転数）を検出し、第２のセンサ素子で回転軌道輪の回転の原点を検出するようにしたものがある（例えば、特許文献１参照）。   In this rolling bearing with a rotation sensor, a magnetic encoder is provided with first and second detected portions adjacent to each other in a concentric ring shape, and the first detected portions are magnetized to magnetic poles that are alternately different in the circumferential direction. In addition, the second detected portion is magnetized to one of the magnetic poles at one place in the circumferential direction for detecting the origin of rotation of the rotating raceway, and the first and second detected portions of this magnetic encoder First and second sensor elements for detecting changes in each magnetic flux from the section are mounted on the fixed raceway, and the first sensor element detects the rotational speed (number of rotations) of the rotary raceway, and the second There is a sensor element that detects the origin of rotation of a rotating race (see, for example, Patent Document 1).

特許文献１に記載されたものでは、磁気エンコーダの第２の被検出部の原点検出用に着磁された原点検出用着磁部以外の残りの円周方向部分を薄肉に形成して、第２のセンサ素子との間隔を原点検出用着磁部よりも拡げ、第２のセンサ素子がこの残りの円周方向部分からの外乱磁束を誤検出しないようにしている。   In the device described in Patent Document 1, the remaining circumferential portion other than the origin detection magnetized portion magnetized for origin detection of the second detected portion of the magnetic encoder is formed thin, The distance between the two sensor elements is larger than that of the origin detecting magnetized portion so that the second sensor element does not erroneously detect the disturbance magnetic flux from the remaining circumferential portion.

特開２００４−１０１３１２号公報JP 2004-103112 A

特許文献１に記載された磁気エンコーダの第２の被検出部の原点検出用着磁部以外の残りの円周方向部分を薄肉に形成した回転センサ付き転がり軸受は、第２の被検出部を容易に着磁して、回転軌道輪の回転の原点を検出できるが、モータ等の磁界が発生する機器に組み込まれて使用されると、機器から漏洩する磁束が第２の被検出部の薄肉に形成された残りの円周方向部分を通過することがあり、第２の被検出部からの磁束の変化を検出する第２のセンサ素子が、本来は磁束を発生しない残りの円周方向部分を通過する漏洩磁束を検出して、回転の原点を誤検出する恐れがある。   The rolling sensor-equipped rolling bearing in which the remaining circumferential portion other than the origin detecting magnetized portion of the second detected portion of the magnetic encoder described in Patent Document 1 is thinly formed is provided with the second detected portion. It can be easily magnetized and the origin of rotation of the rotating raceway can be detected. However, when used in a device that generates a magnetic field such as a motor, the magnetic flux leaking from the device is thin in the second detected part. The second sensor element that detects the change in the magnetic flux from the second detected portion may pass through the remaining circumferential portion formed in the first portion, and the remaining circumferential portion that does not originally generate the magnetic flux. There is a possibility that the origin of rotation is erroneously detected by detecting the leakage magnetic flux passing through.

そこで、本発明の課題は、磁界が発生する機器に組み込まれて使用されても、回転軌道輪の回転の原点を誤検出する恐れのない回転センサ付き転がり軸受を提供することである。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rolling bearing with a rotation sensor that does not have a possibility of erroneously detecting the origin of rotation of a rotating raceway even when incorporated in a device that generates a magnetic field.

上記の課題を解決するために、本発明は、内外輪の軌道輪のうちの回転軌道輪に、同心のリング状で互いに隣接する第１および第２の被検出部を有し、第１の被検出部が円周方向で交互に異なる磁極に着磁され、第２の被検出部が円周方向の１箇所で、前記回転軌道輪の回転の原点検出用に、いずれかの磁極に着磁された磁気エンコーダを装着し、この磁気エンコーダの回転に伴う前記第１および第２の被検出部からの各磁束の変化をそれぞれ検出する第１および第２のセンサ素子を固定軌道輪に装着して、前記回転軌道輪の回転速度を前記第１のセンサ素子で検出し、前記回転軌道輪の回転の原点を前記第２のセンサ素子で検出する回転センサ付き転がり軸受において、前記磁気エンコーダの第２の被検出部の円周方向の１箇所で原点検出用に着磁された原点検出用着磁部以外の残りの円周方向部分を、この原点検出用着磁部の磁極と異なる磁極に着磁した構成を採用した。   In order to solve the above-described problem, the present invention has a first and second detected parts adjacent to each other in a concentric ring shape on a rotating raceway of inner and outer raceways, The detected part is magnetized to different magnetic poles alternately in the circumferential direction, and the second detected part is attached to one of the magnetic poles for detecting the origin of rotation of the rotating raceway at one place in the circumferential direction. A magnetized magnetic encoder is mounted, and first and second sensor elements for detecting changes in magnetic fluxes from the first and second detected portions accompanying rotation of the magnetic encoder are mounted on the fixed track ring. In the rolling bearing with a rotation sensor, wherein the rotation speed of the rotating raceway is detected by the first sensor element, and the origin of rotation of the rotating raceway is detected by the second sensor element, Origin detection at one place in the circumferential direction of the second detected part The remaining circumferential portion other than the magnetized point detection magnetized portion of the adopted a configuration in which magnetized pole and different magnetic poles of the reference point detection magnetized portion.

すなわち、磁気エンコーダの第２の被検出部の円周方向の１箇所で原点検出用に着磁された原点検出用着磁部以外の残りの円周方向部分を、この原点検出用着磁部の磁極と異なる磁極に着磁することにより、残りの円周方向部分から原点検出用着磁部と異なる磁極の磁束を積極的に発生させ、磁界が発生する機器に組み込まれて使用され、その漏洩磁束が残りの円周方向部分を若干通過しても、第２の被検出部からの磁束の変化を検出する第２のセンサ素子が、回転軌道輪の回転の原点を誤検出しないようにした。   That is, the remaining circumferential direction part other than the origin detection magnetized part magnetized for origin detection at one place in the circumferential direction of the second detected part of the magnetic encoder is used as the origin detection magnetized part. By magnetizing a magnetic pole different from that of the magnetic pole, a magnetic flux of a magnetic pole different from that of the origin detecting magnetized portion is positively generated from the remaining circumferential portion, and is used by being incorporated in a device that generates a magnetic field. The second sensor element that detects the change in the magnetic flux from the second detected part does not erroneously detect the origin of rotation of the rotating raceway even if the leakage magnetic flux passes through the remaining circumferential portion slightly. did.

前記第２の被検出部の原点検出用着磁部を別体で形成し、前記第２の被検出部の円周方向で前記原点検出用着磁部の相当部位に窪み部を設けて、この窪み部に前記別体で形成した原点検出用着磁部を接着することにより、原点検出用着磁部の円周方向位置を目視で確認することができる。また、原点検出用着磁部を接着前に効率よく着磁することもできる。   The origin detection magnetized portion of the second detected portion is formed separately, and a hollow portion is provided in a corresponding portion of the origin detected magnetized portion in the circumferential direction of the second detected portion, The position of the origin detecting magnetized portion in the circumferential direction can be visually confirmed by adhering the origin detecting magnetized portion formed separately to the hollow portion. Further, the origin detecting magnetized portion can be efficiently magnetized before bonding.

前記第２の被検出部の残りの円周方向部分を別体で形成し、前記第２の被検出部の円周方向で前記原点検出用着磁部を凸形状に段差を設けて形成して、この凸形状の段差以外の円周方向部分に、前記別体で形成した残りの円周方向部分を接着することによっても、原点検出用着磁部の円周方向位置を目視で確認することができる。また、残りの円周方向部分を接着前に効率よく着磁することもできる。   The remaining circumferential portion of the second detected portion is formed separately, and the origin detecting magnetized portion is formed in a convex shape in the circumferential direction of the second detected portion. In addition, the circumferential position of the origin detecting magnetized portion can be visually confirmed by adhering the remaining circumferential portion formed separately to the circumferential portion other than the convex step. be able to. Further, the remaining circumferential portion can be efficiently magnetized before bonding.

本発明の回転センサ付き転がり軸受は、磁気エンコーダの第２の被検出部の円周方向の１箇所で原点検出用に着磁された原点検出用着磁部以外の残りの円周方向部分を、この原点検出用着磁部の磁極と異なる磁極に着磁することにより、残りの円周方向部分から原点検出用着磁部と異なる磁極の磁束を積極的に発生させるようにしたので、磁界が発生する機器に組み込まれて使用され、その漏洩磁束が残りの円周方向部分を若干通過しても、第２の被検出部からの磁束の変化を検出する第２のセンサ素子が、回転軌道輪の回転の原点を誤検出しないようにすることができる。   The rolling bearing with a rotation sensor according to the present invention has a remaining circumferential portion other than the origin detection magnetized portion magnetized for origin detection at one location in the circumferential direction of the second detected portion of the magnetic encoder. Since the magnetic poles different from the magnetic poles of the origin detecting magnetized portion are magnetized, the magnetic flux of the magnetic poles different from those of the origin detecting magnetized portion is positively generated from the remaining circumferential portion. The second sensor element that detects the change in the magnetic flux from the second detected portion is rotated even if the leakage magnetic flux passes through the remaining circumferential direction portion slightly. It is possible to prevent erroneous detection of the origin of rotation of the race.

前記第２の被検出部の原点検出用着磁部を別体で形成し、第２の被検出部の円周方向で原点検出用着磁部の相当部位に窪み部を設けて、この窪み部に別体で形成した原点検出用着磁部を接着することにより、原点検出用着磁部の円周方向位置を目視で確認することができる。原点検出用着磁部を接着前に効率よく着磁することもできる。   The origin detecting magnetized portion of the second detected portion is formed separately, and a recess is provided in a corresponding portion of the origin detecting magnetized portion in the circumferential direction of the second detected portion. By adhering the origin detecting magnetized part formed separately to the part, the circumferential position of the origin detecting magnetized part can be visually confirmed. The origin detecting magnetized portion can be efficiently magnetized before bonding.

前記第２の被検出部の残りの円周方向部分を別体で形成し、第２の被検出部の円周方向で原点検出用着磁部を凸形状に段差を設けて形成して、この凸形状の段差以外の円周方向部分に、別体で形成した残りの円周方向部分を接着することによっても、原点検出用着磁部の円周方向位置を目視で確認することができる。残りの円周方向部分を接着前に効率よく着磁することもできる。   The remaining circumferential portion of the second detected portion is formed separately, and the origin detecting magnetized portion is formed in a convex shape with a step in the circumferential direction of the second detected portion, The circumferential position of the origin detecting magnetized portion can also be visually confirmed by adhering the remaining circumferential part formed separately to the circumferential part other than the convex step. . The remaining circumferential portion can be efficiently magnetized before bonding.

以下、図面に基づき、本発明の実施形態を説明する。図１乃至図３は、第１の実施形態を示す。この回転センサ付き転がり軸受はモータの主軸を支持する深溝玉軸受であり、図１に示すように、回転軌道輪としての内輪１と固定軌道輪としての外輪２の間の軸受空間に、ボール３が保持器４で保持されて、軸受空間の一端側がシール５でシールされており、シール５でシールされた側と反対側で、内輪１に磁気エンコーダ６が装着され、外輪２に磁気エンコーダ６の回転に伴う磁束の変化を検出するセンサユニット７が装着されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. This rolling bearing with a rotation sensor is a deep groove ball bearing that supports the main shaft of the motor. As shown in FIG. 1, a ball 3 is provided in a bearing space between an inner ring 1 as a rotating raceway and an outer ring 2 as a fixed raceway. Is held by the cage 4, and one end side of the bearing space is sealed with a seal 5. A magnetic encoder 6 is mounted on the inner ring 1 on the side opposite to the side sealed with the seal 5, and the magnetic encoder 6 is mounted on the outer ring 2. A sensor unit 7 for detecting a change in magnetic flux accompanying the rotation of is mounted.

前記磁気エンコーダ６は、磁性材料をゴムで結合して円筒状に成形したものであり、内輪１の外径面端部に圧入で固定された芯金８の外径面に加硫接着されている。図２に示すように、磁気エンコーダ６は、互いに軸方向で隣接する第１の被検出部６ａと第２の被検出部６ｂを有し、第１の被検出部６ａは、円周方向で交互にＮ極とＳ極との異なる磁極に着磁され、第２の被検出部６ｂは、円周方向の１箇所が内輪１の回転の原点検出用着磁部９ａとしてＳ極に着磁され、残りの円周方向部分９ｂがこれと異なるＮ極に着磁されている。第１および第２の被検出部６ａ、６ｂは同じ厚さに形成され、Ｓ極とされた第２の被検出部６ｂの原点検出用着磁部９ａは、第１の被検出部６ａの１つのＳ極と同じ幅で軸方向に連なっている。   The magnetic encoder 6 is formed by combining magnetic materials with rubber and is formed into a cylindrical shape. The magnetic encoder 6 is vulcanized and bonded to an outer diameter surface of a cored bar 8 fixed by press-fitting to an outer diameter surface end of the inner ring 1. Yes. As shown in FIG. 2, the magnetic encoder 6 includes a first detected portion 6a and a second detected portion 6b that are adjacent to each other in the axial direction, and the first detected portion 6a is arranged in the circumferential direction. The second detected portion 6b is magnetized on the S pole as one origin detection magnetizing portion 9a for rotating the inner ring 1 at one place in the circumferential direction. The remaining circumferential portion 9b is magnetized with a different N pole. The first and second detected parts 6a and 6b are formed to have the same thickness, and the origin detecting magnetized part 9a of the second detected part 6b having the S pole is the same as that of the first detected part 6a. It is continuous in the axial direction with the same width as one S pole.

前記センサユニット７は、図１に示したように、外輪２の内径面端部に圧入で固定された外径側の金属ケース１０と内径側の樹脂ケース１１の間に、第１および第２のセンサ素子１２ａ、１２ｂを組み込んだものであり、第１のセンサ素子１２ａが磁気エンコーダ６の第１の被検出部６ａと、第２のセンサ素子１２ｂが第２の被検出部６ｂと、それぞれ半径方向で対向するようにモールドで固定されている。なお、磁気エンコーダ６の芯金８と平行に沿う樹脂ケース１１の先端部には内向きの鍔１１ａが設けられ、磁気エンコーダ６の芯金８とセンサユニット７の樹脂ケース１１との間に、軸受空間をシールするラビリンス隙間が形成されている。   As shown in FIG. 1, the sensor unit 7 includes first and second portions between an outer diameter side metal case 10 and an inner diameter side resin case 11 fixed by press-fitting to the inner diameter surface end of the outer ring 2. Sensor elements 12a and 12b are incorporated, the first sensor element 12a is the first detected part 6a of the magnetic encoder 6, the second sensor element 12b is the second detected part 6b, respectively. It is fixed with a mold so as to face each other in the radial direction. An inward flange 11 a is provided at the tip of the resin case 11 parallel to the core 8 of the magnetic encoder 6, and between the core 8 of the magnetic encoder 6 and the resin case 11 of the sensor unit 7, A labyrinth gap for sealing the bearing space is formed.

図３（ａ）、（ｂ）は、前記磁気エンコーダ６が内輪１と一緒に回転したときに、それぞれ第１および第２のセンサ素子１２ａ、１２ｂで検出される磁束の変化を示す。図３（ａ）に示すように、第１のセンサ素子１２ａで検出される磁束は、第１の被検出部６ａのＮ極とＳ極が交互に通過する毎にＮ極側とＳ極側へ波状に変化し、磁束がＮ極側とＳ極側の各閾値ＷＮ１、ＷＳ１を越えたときに、回転単位が積算されて回転速度が検出される。 3A and 3B show changes in magnetic flux detected by the first and second sensor elements 12a and 12b, respectively, when the magnetic encoder 6 rotates together with the inner ring 1. FIG. As shown in FIG. 3 (a), the magnetic flux detected by the first sensor element 12a is N pole side and S pole side every time the N pole and S pole of the first detected portion 6a pass alternately. When the magnetic flux changes to a wave shape and the magnetic flux exceeds the respective threshold values W N1 and W S1 on the N pole side and the S pole side, the rotation units are integrated and the rotation speed is detected.

また、図３（ｂ）に示すように、第２のセンサ素子１２ｂで検出される磁束は、第２の被検出部６ｂの原点検出用着磁部９ａが通過するときだけＳ極側へ変化し、残りの円周方向部分９ｂが通過する間はＮ極側で一定に保持される。この場合は、磁束がＳ極側へ変化して閾値ＷＳ２を越え、さらに磁束がＮ極側へ戻って閾値ＷＮ２を越えたときに、原点の通過が検出される。 Further, as shown in FIG. 3B, the magnetic flux detected by the second sensor element 12b changes to the S pole side only when the origin detecting magnetized portion 9a of the second detected portion 6b passes. However, while the remaining circumferential portion 9b passes, it is held constant on the N pole side. In this case, the passage of the origin is detected when the magnetic flux changes to the S pole side and exceeds the threshold value WS2 , and further when the magnetic flux returns to the N pole side and exceeds the threshold value WN2 .

図４は、前記磁気エンコーダ６の第１の変形例を示す。この変形例では、第２の被検出部６ｂのＳ極とされた原点検出用着磁部９ａが、第１の被検出部６ａの１つのＮ極と軸方向で隣接するように設けられている。   FIG. 4 shows a first modification of the magnetic encoder 6. In this modification, the origin detecting magnetized portion 9a, which is the S pole of the second detected portion 6b, is provided so as to be adjacent to one N pole of the first detected portion 6a in the axial direction. Yes.

図５は、前記磁気エンコーダ６の第２の変形例を示す。この変形例では、第２の被検出部６ｂの原点検出用着磁部９ａが、磁性材料をゴムで結合した別体で形成されるとともに、第２の被検出部６ｂの円周方向で１箇所に窪み部１３が設けられ、別体で形成された原点検出用着磁部９ａが窪み部１３で芯金８に接着剤で接着されるようになっており、原点検出用着磁部９ａは接着前にＳ極に着磁されている。原点検出用着磁部９ａは接着後に着磁してもよい。   FIG. 5 shows a second modification of the magnetic encoder 6. In this modified example, the origin detecting magnetized portion 9a of the second detected portion 6b is formed as a separate body in which a magnetic material is coupled with rubber, and 1 in the circumferential direction of the second detected portion 6b. A hollow portion 13 is provided at a location, and an origin detection magnetized portion 9a formed separately is bonded to the cored bar 8 with an adhesive at the hollow portion 13, and the origin detection magnetized portion 9a. Is magnetized on the south pole before bonding. The origin detecting magnetized portion 9a may be magnetized after bonding.

図６は、前記磁気エンコーダ６の第３の変形例を示す。この変形例では、第２の被検出部６ｂの残りの円周方向部分９ｂが、磁性材料をゴムで結合した別体で形成されるとともに、第２の被検出部６ｂで原点検出用着磁部９ａが凸形状に段差を設けて形成され、別体で形成された残りの円周方向部分９ｂが原点検出用着磁部９ａ以外の円周方向の凹段差部１４で芯金８に接着剤で接着されるようになっており、残りの円周方向部分９ｂは、接着前にＮ極に着磁されている。残りの円周方向部分９ｂは接着後に着磁してもよい。   FIG. 6 shows a third modification of the magnetic encoder 6. In this modification, the remaining circumferential portion 9b of the second detected portion 6b is formed as a separate body obtained by combining a magnetic material with rubber, and the origin detecting magnetization is performed in the second detected portion 6b. The portion 9a is formed with a step in a convex shape, and the remaining circumferential portion 9b formed separately is bonded to the cored bar 8 with a circumferential concave step portion 14 other than the origin detecting magnetized portion 9a. The remaining circumferential portion 9b is magnetized to the N pole before bonding. The remaining circumferential portion 9b may be magnetized after bonding.

図７および図８は、第２の実施形態を示す。この回転センサ付き転がり軸受もモータの主軸を支持する深溝玉軸受であり、図７に示すように、回転軌道輪になる内輪１と固定軌道輪になる外輪２の間の軸受空間に、ボール３が保持器４で保持されて、軸受空間の一端側がシール５でシールされている。   7 and 8 show a second embodiment. This rolling bearing with a rotation sensor is also a deep groove ball bearing that supports the main shaft of the motor. As shown in FIG. 7, a ball 3 is provided in a bearing space between an inner ring 1 that is a rotating raceway and an outer ring 2 that is a fixed raceway. Is held by the cage 4, and one end side of the bearing space is sealed by a seal 5.

この実施形態では、前記内輪１の外径面の段差部１ａに圧入で固定されたＬ字断面の芯金８の側面に、磁性材料をゴムで結合して円板状に成形した磁気エンコーダ６が加硫接着されている。図８に示すように、磁気エンコーダ６は、円周方向で交互にＮ極とＳ極とに着磁された第１の被検出部６ａと、円周方向の１箇所が原点検出用着磁部９ａとしてＳ極に着磁され、残りの円周方向部分９ｂがＮ極に着磁された第２の被検出部６ｂとが、外周側と内周側に半径方向で隣接するように形成されている。なお、原点検出用着磁部９ａまたは残りの円周方向部分９ｂは、第１の実施形態のものと同様に、別体で形成することもできる。   In this embodiment, a magnetic encoder 6 is formed by bonding a magnetic material with rubber to the side surface of an L-shaped cored bar 8 fixed by press-fitting to the stepped portion 1a on the outer diameter surface of the inner ring 1. Is vulcanized and bonded. As shown in FIG. 8, the magnetic encoder 6 includes a first detected portion 6a that is alternately magnetized in the circumferential direction with N and S poles, and one point in the circumferential direction that is magnetized for origin detection. As a portion 9a, the second detected portion 6b magnetized to the S pole and the remaining circumferential portion 9b magnetized to the N pole is formed so as to be adjacent to the outer peripheral side and the inner peripheral side in the radial direction. Has been. The origin detecting magnetized portion 9a or the remaining circumferential portion 9b can be formed separately as in the first embodiment.

また、前記センサユニット７は、図７に示したように、外輪２の外径面端部に圧入で固定された金属ケース１０に、第１および第２のセンサ素子１２ａ、１２ｂが組み込まれており、第１および第２のセンサ素子１２ａ、１２ｂは、磁気エンコーダ６の第１および第２の被検出部６ａ、６ｂと、それぞれ軸方向で対向するようにモールドで固定されている。この実施形態でも、磁気エンコーダ６のＬ字断面の芯金８とセンサユニット７との間に軸受空間をシールするラビリンス隙間が形成されている。   Further, as shown in FIG. 7, the sensor unit 7 includes first and second sensor elements 12a and 12b incorporated in a metal case 10 fixed by press-fitting to the outer diameter surface end portion of the outer ring 2. The first and second sensor elements 12a and 12b are fixed by a mold so as to face the first and second detected parts 6a and 6b of the magnetic encoder 6 in the axial direction. Also in this embodiment, a labyrinth gap that seals the bearing space is formed between the L-shaped cored bar 8 of the magnetic encoder 6 and the sensor unit 7.

上述した各実施形態および変形例では、磁気エンコーダおよび、別体で形成した第２の被検出部の原点検出用着磁部や残りの円周方向部分を、磁性材料をゴムで結合して成形したものとしたが、これらを磁性材料を熱可塑性樹脂等の樹脂で結合して射出成形し、接着や圧入等によって芯金に取り付けてもよい。また、第２の被検出部の原点検出用着磁部をＳ極に、残りの円周方向部分をＮ極に着磁したが、原点検出用着磁部をＮ極に、残りの円周方向部分をＳ極に着磁してもよい。   In each of the above-described embodiments and modified examples, the magnetic encoder and the magnetized part for detecting the origin of the second detected part formed separately and the remaining circumferential part are formed by joining a magnetic material with rubber. However, these may be injection-molded by bonding a magnetic material with a resin such as a thermoplastic resin, and attached to the core metal by adhesion or press-fitting. In addition, the origin detection magnetized portion of the second detected portion is magnetized to the S pole and the remaining circumferential portion is magnetized to the N pole, but the origin detecting magnetized portion is the N pole and the remaining circumference The direction portion may be magnetized to the south pole.

さらに、上述した各実施形態では、転がり軸受を内輪が回転軌道輪とされた深溝玉軸受としたが、本発明に係る回転センサ付き転がり軸受は、ころ軸受等の他のタイプの転がり軸受や複列の転がり軸受にも適用することができ、外輪が回転軌道輪とされた転がり軸受にも適用することができる。   Further, in each of the above-described embodiments, the rolling bearing is a deep groove ball bearing whose inner ring is a rotating raceway. However, the rolling bearing with a rotation sensor according to the present invention is a roller bearing such as a roller bearing or a compound bearing. The present invention can also be applied to row rolling bearings, and can also be applied to rolling bearings in which the outer ring is a rotating race.

第１の実施形態の回転センサ付き転がり軸受を示す縦断面図The longitudinal cross-sectional view which shows the rolling bearing with a rotation sensor of 1st Embodiment 図１の磁気エンコーダを示す外観斜視図1 is an external perspective view showing the magnetic encoder of FIG. ａ、ｂは、それぞれ図１の第１および第２のセンサ素子で検出される磁束の変化を示すグラフa and b are graphs showing changes in magnetic flux detected by the first and second sensor elements of FIG. 1, respectively. 図２の磁気エンコーダの第１の変形例を示す外観斜視図FIG. 2 is an external perspective view showing a first modification of the magnetic encoder in FIG. 図２の磁気エンコーダの第２の変形例を示す分解斜視図2 is an exploded perspective view showing a second modification of the magnetic encoder of FIG. 図２の磁気エンコーダの第３の変形例を示す分解斜視図2 is an exploded perspective view showing a third modification of the magnetic encoder in FIG. 第２の実施形態の回転センサ付き転がり軸受を示す縦断面図The longitudinal cross-sectional view which shows the rolling bearing with a rotation sensor of 2nd Embodiment 図７の磁気エンコーダを示す外観斜視図FIG. 7 is an external perspective view showing the magnetic encoder of FIG.

符号の説明Explanation of symbols

１ 内輪
１ａ 段差部
２ 外輪
３ ボール
４ 保持器
５ シール
６ 磁気エンコーダ
６ａ、６ｂ 被検出部
７ センサユニット
８ 芯金
９ａ 原点検出用着磁部
９ｂ 残りの円周方向部分
１０ 金属ケース
１１ 樹脂ケース
１１ａ 鍔
１２ａ、１２ｂ センサ素子
１３ 窪み部
１４ 凹段差部 DESCRIPTION OF SYMBOLS 1 Inner ring 1a Step part 2 Outer ring 3 Ball 4 Cage 5 Seal 6 Magnetic encoder 6a, 6b Detected part 7 Sensor unit 8 Core metal 9a Origin detection magnetized part 9b Remaining circumferential part 10 Metal case 11 Resin case 11a鍔 12a, 12b Sensor element 13 Recessed portion 14 Recessed step portion

Claims (3)

内外輪の軌道輪のうちの回転軌道輪に、同心のリング状で互いに隣接する第１および第２の被検出部を有し、第１の被検出部が円周方向で交互に異なる磁極に着磁され、第２の被検出部が円周方向の１箇所で、前記回転軌道輪の回転の原点検出用に、いずれかの磁極に着磁された磁気エンコーダを装着し、この磁気エンコーダの回転に伴う前記第１および第２の被検出部からの各磁束の変化をそれぞれ検出する第１および第２のセンサ素子を固定軌道輪に装着して、前記回転軌道輪の回転速度を前記第１のセンサ素子で検出し、前記回転軌道輪の回転の原点を前記第２のセンサ素子で検出する回転センサ付き転がり軸受において、前記磁気エンコーダの第２の被検出部の円周方向の１箇所で原点検出用に着磁された原点検出用着磁部以外の残りの円周方向部分を、この原点検出用着磁部の磁極と異なる磁極に着磁したことを特徴とする回転センサ付き転がり軸受。   The rotating races of the inner and outer races have concentric ring-shaped first and second detected parts adjacent to each other, and the first detected parts have different magnetic poles alternately in the circumferential direction. A magnetic encoder magnetized on one of the magnetic poles is mounted to detect the origin of rotation of the rotating raceway at one place in the circumferential direction of the second detected portion. First and second sensor elements for detecting changes in magnetic fluxes from the first and second detected portions accompanying rotation are attached to a fixed raceway, and the rotational speed of the rotary raceway is adjusted to the first speed. In a rolling bearing with a rotation sensor, which is detected by one sensor element and detects the origin of rotation of the rotating raceway ring by the second sensor element, one location in the circumferential direction of the second detected portion of the magnetic encoder Other than the origin detection magnetized part magnetized for origin detection with Circumferential portions, the rolling bearing with a rotation sensor, characterized in that the magnetized pole and different magnetic poles of the reference point detection magnetized portion of. 前記第２の被検出部の原点検出用着磁部を別体で形成し、前記第２の被検出部の円周方向で前記原点検出用着磁部の相当部位に窪み部を設けて、この窪み部に前記別体で形成した原点検出用着磁部を接着した請求項１に記載の回転センサ付き転がり軸受。   The origin detection magnetized portion of the second detected portion is formed separately, and a hollow portion is provided in a corresponding portion of the origin detected magnetized portion in the circumferential direction of the second detected portion, The rolling bearing with a rotation sensor according to claim 1, wherein an origin detection magnetized portion formed separately from the hollow portion is bonded to the hollow portion. 前記第２の被検出部の残りの円周方向部分を別体で形成し、前記第２の被検出部の円周方向で前記原点検出用着磁部を凸形状に段差を設けて形成して、この凸形状の段差以外の円周方向部分に、前記別体で形成した残りの円周方向部分を接着した請求項１に記載の回転センサ付き転がり軸受。   The remaining circumferential portion of the second detected portion is formed separately, and the origin detecting magnetized portion is formed in a convex shape in the circumferential direction of the second detected portion. The rolling sensor-equipped rolling bearing according to claim 1, wherein the remaining circumferential portion formed separately is bonded to a circumferential portion other than the convex step.
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