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WO2007086363A1 - Rolling bearing with rotation sensor - Google Patents

Rolling bearing with rotation sensor Download PDF

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Publication number
WO2007086363A1
WO2007086363A1 PCT/JP2007/050959 JP2007050959W WO2007086363A1 WO 2007086363 A1 WO2007086363 A1 WO 2007086363A1 JP 2007050959 W JP2007050959 W JP 2007050959W WO 2007086363 A1 WO2007086363 A1 WO 2007086363A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetized
origin
detected
detection
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/050959
Other languages
French (fr)
Japanese (ja)
Inventor
Hiroyoshi Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Publication of WO2007086363A1 publication Critical patent/WO2007086363A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a rolling bearing with a rotation sensor capable of detecting an origin of rotation of a rotating race.
  • a magnetic encoder is mounted on the rotating race among the races of the inner and outer rings, and a magnetic pole is produced on rotation of the magnetic encoder on the fixed race.
  • a rolling bearing with a rotation sensor that is equipped with a sensor element that detects a change and detects the rotation of the rotating race.
  • the rolling bearing with rotation sensor is provided with first and second detection portions adjacent to each other in a ring shape concentric to the magnetic encoder, and the first detection portions are alternately different in the circumferential direction. While magnetizing the magnetic pole, the second detected portion is magnetized at one point in the circumferential direction for detecting the origin of the rotation of the rotating race, and the first and the second magnetic encoders.
  • the first and second sensor elements which respectively detect changes in magnetic flux from the second detection target, are attached to the fixed bearing ring, and the rotational speed (rotational speed) of the rotating bearing ring is measured with the first sensor element.
  • detection is performed and a second sensor element detects an origin of rotation of the rotating race (for example, see Patent Document 1).
  • the circumferential direction portion other than the origin detection magnetized portion magnetized for detecting the origin of the second detected portion of the magnetic encoder is formed thin.
  • the distance from the second sensor element is larger than that of the origin detection magnetized portion, so that the second sensor element does not erroneously detect disturbance magnetic flux from the remaining circumferential portion.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-101312
  • a rolling bearing with a rotation sensor in which the remaining portion in the circumferential direction other than the origin-detecting magnetized portion of the second detected portion of the magnetic encoder described in Patent Document 1 is thin, is a second rolling bearing. Covered
  • the detection part can be easily magnetized to detect the origin of rotation of the rotating race, but if it is incorporated into equipment that generates a magnetic field such as a motor, the magnetic flux leaking from the equipment will
  • a second sensor element that may pass through the remaining circumferentially formed thin portion of the detection unit and detects a change in magnetic flux from the second detection unit is a remaining sensor that does not generate magnetic flux in nature. Leakage flux passing through the circumferential direction may be detected to misdetect the origin of rotation.
  • the object of the present invention is to provide a rolling force sensor bearing with a rotation sensor without fear of erroneously detecting the origin of rotation of a rolling ring even if it is incorporated and used in a device that generates a magnetic field. It is to be.
  • the present invention has first and second detection portions concentric to each other in a ring shape, which are concentric rings, on the rotation ring of the inner and outer rings.
  • the first portion to be detected is alternately magnetized in different magnetic poles in the circumferential direction, and the second portion to be detected is at one point in the circumferential direction, either for detecting the origin of rotation of the rotation ring.
  • a magnetic encoder is attached to the magnetic pole of the first magnetic sensor, and the first and second sensor elements are fixed, each detecting a change in each magnetic flux from the first and second detection portions as the magnetic encoder rotates.
  • a rolling bearing with a rotation sensor which is mounted on a bearing ring, detects the rotational speed of the rotating bearing ring with the first sensor element, and detects the origin of rotation of the rotating bearing ring with the second sensor element.
  • Raw inspection at one point in the circumferential direction of the second detected part of the magnetic encoder The remaining circumferential portion other than the magnetized point detection magnetized portion of the use, employing the configuration magnetized pole and different magnetic poles of the reference point detection magnetized portion.
  • the remaining circumferential portion other than the origin detection magnetized portion magnetized for origin detection at one point in the circumferential direction of the second detected portion of the magnetic encoder is used for the origin detection.
  • the remaining circumferential part positively generates the magnetic flux of the magnetic pole different from the origin detection magnetizing part, and is incorporated into the device generating the magnetic field and used.
  • the second sensor element that detects a change in the magnetic flux from the second detected portion erroneously detects the origin of the rotation of the rotating race, even if the leakage flux slightly passes through the remaining circumferential portion. I did not.
  • the origin-detecting magnetized portion for the second detected portion is separately formed, and a depressed portion is formed in the corresponding portion of the origin-detecting magnetized portion in the circumferential direction of the second detected portion.
  • the circumferential position of the origin detection magnetized portion can be visually confirmed by providing it and adhering the origin detection magnetized portion formed separately as described above to the recessed portion.
  • the remaining circumferential portion of the second detected portion is separately formed, and the origin detecting magnetized portion is stepped in a convex shape in the circumferential direction of the second detected portion.
  • the circumferential direction of the origin detection magnetized portion can also be formed by bonding the remaining circumferential portion separately formed to the circumferential portion other than the convex step. The position can be checked visually.
  • the remaining circumferential portions can be efficiently magnetized before bonding.
  • the rolling bearing with a rotation sensor according to the present invention has a remaining circumference other than the origin detection magnetized portion magnetized for origin detection at one point in the circumferential direction of the second detected portion of the magnetic encoder.
  • the second sensor element is used by being incorporated in a device that generates a magnetic field, and that detects a change in magnetic flux from the second detected portion even if its leakage flux slightly passes through the remaining circumferential portion.
  • the origin of rotation of the rotating race can be prevented from being detected erroneously.
  • the origin detection magnetized portion of the second detected portion is separately formed, and a depressed portion is provided in the corresponding portion of the origin detected magnetized portion in the circumferential direction of the second detected portion.
  • the circumferential position of the origin detection magnetized portion can be visually confirmed by bonding the origin detection magnetized portion separately formed on the recessed portion.
  • the origin detection magnetized portion can also be efficiently magnetized prior to bonding.
  • the remaining circumferential portion of the second detected portion is separately formed, and the magnetized portion for origin point detection is formed with steps in a convex shape in the circumferential direction of the second detected portion.
  • the circumferential position of the origin detection magnetized portion can be visually observed. You can check it with The remaining circumferential portions can be efficiently magnetized before bonding.
  • FIG. 1 A longitudinal sectional view showing a rolling sensor with a rotation sensor according to a first embodiment.
  • FIG. 2 An external perspective view showing the magnetic encoder of FIG.
  • FIG. 3 a and b are graphs showing changes in magnetic flux detected by the first and second sensor elements in FIG. 1, respectively.
  • FIG. 4 An appearance perspective view showing a first modification of the magnetic encoder of FIG.
  • FIG. 5 An exploded perspective view showing a second modification of the magnetic encoder of FIG.
  • FIG. 6 An exploded perspective view showing a third modification of the magnetic encoder of FIG.
  • FIG. 7 A longitudinal sectional view showing a rolling sensor with a rotation sensor according to a second embodiment.
  • FIG. 8 An external perspective view showing the magnetic encoder of FIG.
  • the rolling bearing with rotation sensor is a deep groove ball bearing for supporting the main shaft of the motor, and as shown in FIG. 1, in the bearing space between the inner ring 1 as the rotating race and the outer ring 2 as the fixed race, Is held by the cage 4 and one end of the bearing space is sealed by the seal 5, and the magnetic encoder 6 is attached to the inner ring 1 on the side opposite to the side sealed by the seal 5.
  • a sensor unit 7 is attached to detect a change in magnetic flux as the encoder 6 rotates.
  • the magnetic encoder 6 is formed by bonding a magnetic material with rubber and is formed into a cylindrical shape, and is vulcanized on the outer diameter surface of the core metal 8 fixed by press fitting to the outer diameter surface end of the inner ring 1. It is glued. As shown in FIG. 2, the magnetic encoder 6 has a first detection portion 6a and a second detection portion 6b axially adjacent to each other, and the first detection portion 6a extends in the circumferential direction.
  • the second detection part 6b is alternately magnetized in the S pole as the origin detection magnetizing part 9a for rotation of the inner ring 1 at one place in the circumferential direction. And the remaining circumferential portion 9b is magnetized to a different N pole.
  • the first and second detection target portions 6a and 6b are formed to have the same thickness, and the origin detection magnetized portion 9a of the second detection target portion 6b which is the S pole is the same as the first detection target portion 6a. It runs in the axial direction with the same width as one S pole.
  • the sensor unit 7 is provided between the metal case 10 on the outer diameter side and the resin case 11 on the inner diameter side fixed by press-fitting to the inner diameter surface end of the outer ring 2.
  • the first and second sensor elements 12a and 12b are incorporated, and the first sensor element 12a is a first detected portion 6a of the magnetic encoder 6 and the second sensor element 12b is a second detected element. It is fixed by a mold so as to face the portion 6 b in the radial direction.
  • the inward ridge 11 a is provided at the end of the resin case 11 parallel to the core metal 8 of the magnetic encoder 6, and between the core metal 8 of the magnetic encoder 6 and the resin case 11 of the sensor unit 7.
  • a labyrinth gap is formed to seal the bearing space.
  • FIGS. 3 (a) and 3 (b) show changes in the magnetic flux detected by the first and second sensor elements 12a and 12b, respectively, when the magnetic encoder 6 rotates with the inner ring 1.
  • Figure 3 (a) As shown, the magnetic flux detected by the first sensor element 12a changes in a wavelike manner to the N pole side and the S pole side each time the N pole and the S pole of the first detected portion 6a pass alternately. When the magnetic flux exceeds the threshold values W and W of the N pole side and the S pole side, the rotation units are integrated and the rotation speed is detected.
  • the magnetic flux detected by the second sensor element 12b is detected only when the origin detection magnetized portion 9a of the second detection target 6b passes through. It changes to the side and is held constant on the N pole side while the remaining circumferential portion 9b passes. In this case, when the magnetic flux changes to the south pole side and exceeds the threshold W and the magnetic flux returns to the north pole side and exceeds the threshold W,
  • FIG. 4 shows a first modification of the magnetic encoder 6.
  • an origin detection magnetized portion 9a which is the S pole of the second detection portion 6b, is provided axially adjacent to one N pole of the first detection portion 6a. ing.
  • FIG. 5 shows a second modification of the magnetic encoder 6.
  • the origin detection magnetized portion 9a of the second detection portion 6b is formed as a separate body in which a magnetic material is bonded by rubber, and the circumferential direction of the second detection portion 6b.
  • a recessed portion 13 is provided at one location, and a magnetizing portion 9a for origin detection separately formed is bonded to the core metal 8 with an adhesive at the recessed portion 13, and the magnetization for origin detection is formed.
  • the part 9a is magnetized to the S pole before bonding.
  • the origin detection magnetized portion 9a may be magnetized after bonding.
  • FIG. 6 shows a third modification of the magnetic encoder 6.
  • the remaining circumferential portion 9b of the second detection portion 6b is formed as a separate body in which a magnetic material is bonded with rubber, and the second detection portion 6b detects the origin.
  • the magnetized portion 9a is formed to have a step in a convex shape, and the remaining circumferential portion 9b separately formed is a cored bar at the recessed step portion 14 in the circumferential direction other than the origin detection magnetized portion 9a.
  • the remaining circumferential portion 9b is magnetized to the N pole prior to bonding.
  • the remaining circumferential portion 9b may be magnetized after bonding.
  • FIG. 7 shows 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, and as shown in FIG. 7, in the bearing space between the inner ring 1 to be the rotating ring and the outer ring 2 to be the fixed ring. Is held by the holder 4, and one end of the bearing space is sealed by the seal 5.
  • a magnetic material is bonded with rubber to the side surface of the core metal 8 of the L-shaped cross section fixed by press fitting to the step portion la of the outer diameter surface of the inner ring 1 and molded into a disk shape.
  • Magnetic encoder 6 is bonded by vulcanization. As shown in FIG.
  • the first detection target 6 a is alternately magnetized in the circumferential direction to the N pole and the S pole, and one point in the circumferential direction is a magnetization for origin point detection. It forms so that the 2nd to-be-detected part 6b which is magnetized to S pole as the part 9a, and the remaining circumferential direction part 9b is magnetized to N pole is adjacent to the outer peripheral side and the inner peripheral side in the radial direction. It is done.
  • the origin detection magnetized portion 9a or the remaining circumferential portion 9b can be formed separately as in the first embodiment.
  • the sensor unit 7 is provided with the first and second sensor elements 12 a and 12 b in a metal case 10 fixed by press-fitting to the outer diameter surface end of the outer ring 2.
  • the first and second sensor elements 12a and 12b are fixed in a mold so as to axially face the first and second detection portions 6a and 6b of the magnetic encoder 6, respectively.
  • a labyrinth gap for sealing the bearing space is formed between the metal core 8 of the L-shaped cross section of the magnetic encoder 6 and the sensor unit 7 and is formed.
  • the magnetic encoder and the circumferential portion for the origin detection magnetized portion of the second detection target separately formed and the remaining circumferential portion are coupled with a magnetic material by rubber.
  • the magnetic material is bonded with a resin such as a thermoplastic resin and injection molded, and may be attached to the core metal by adhesion, press-fitting or the like.
  • the second detection magnetized portion for detecting the origin point was S pole, and the remaining part in the circumferential direction was N pole, but the original inspection magnetized portion is N pole and the remaining circles are The circumferential portion may be magnetized to the S pole.
  • the rolling bearing is a deep groove ball bearing in which the inner ring is a rotating race
  • the rolling bearing with a rotation sensor according to the present invention is another type of rolling such as a roller bearing. It can be applied to bearings and double-row rolling bearings, and it can also be applied to rolling bearings whose outer ring is a rotating race.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

A rolling bearing with a rotation sensor in which the origin of rotation of a rotary bearing ring is not detected erroneously even if the rolling bearing is built in an apparatus generating a magnetic field and used. Remaining circumferential portion (9b) other than a magnetized portion (9a) for detecting an origin magnetized for detecting an origin at one circumferential position of a second detected portion (6b) of a magnetic encoder (6) is magnetized with a polarity different from that of the magnetized portion (9a) for detecting an origin in order to generate magnetic flux having a polarity different from that of the magnetized portion (9a) for detecting an origin positively from the remaining circumferential portion (9b). Even if the rolling bearing is built in an apparatus generating a magnetic field and some of its leakage flux passes through the remaining circumferential portion, a second sensor element for detecting a variation in magnetic flux from the second detected portion (6b) does not detect the origin of rotation of the rotary bearing ring erroneously.

Description

明 細 書  Specification

回転センサ付き転がり軸受  Rolling bearing with rotation sensor

技術分野  Technical field

[0001] 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 an origin of rotation of a rotating race.

背景技術  Background art

[0002] 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。  [0002] In a rolling bearing that supports the rotating shaft of various rotating devices, a magnetic encoder is mounted on the rotating race among the races of the inner and outer rings, and a magnetic pole is produced on rotation of the magnetic encoder on the fixed race. There is a rolling bearing with a rotation sensor that is equipped with a sensor element that detects a change and detects the rotation of the rotating race.

[0003] 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）。  The rolling bearing with rotation sensor is provided with first and second detection portions adjacent to each other in a ring shape concentric to the magnetic encoder, and the first detection portions are alternately different in the circumferential direction. While magnetizing the magnetic pole, the second detected portion is magnetized at one point in the circumferential direction for detecting the origin of the rotation of the rotating race, and the first and the second magnetic encoders The first and second sensor elements, which respectively detect changes in magnetic flux from the second detection target, are attached to the fixed bearing ring, and the rotational speed (rotational speed) of the rotating bearing ring is measured with the first sensor element. There is a system in which detection is performed and a second sensor element detects an origin of rotation of the rotating race (for example, see Patent Document 1).

[0004] 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。  According to Patent Document 1, the circumferential direction portion other than the origin detection magnetized portion magnetized for detecting the origin of the second detected portion of the magnetic encoder is formed thin. The distance from the second sensor element is larger than that of the origin detection magnetized portion, so that the second sensor element does not erroneously detect disturbance magnetic flux from the remaining circumferential portion.

[0005] 特許文献 1 :特開 2004— 101312号公報  Patent Document 1: Japanese Patent Application Laid-Open No. 2004-101312

発明の開示  Disclosure of the invention

発明が解決しょうとする課題  Problem that invention tries to solve

[0006] 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。 [0006] A rolling bearing with a rotation sensor, in which the remaining portion in the circumferential direction other than the origin-detecting magnetized portion of the second detected portion of the magnetic encoder described in Patent Document 1 is thin, is a second rolling bearing. Covered The detection part can be easily magnetized to detect the origin of rotation of the rotating race, but if it is incorporated into equipment that generates a magnetic field such as a motor, the magnetic flux leaking from the equipment will A second sensor element that may pass through the remaining circumferentially formed thin portion of the detection unit and detects a change in magnetic flux from the second detection unit is a remaining sensor that does not generate magnetic flux in nature. Leakage flux passing through the circumferential direction may be detected to misdetect the origin of rotation.

[0007] 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力 Sり軸受を提供 することである。  [0007] Therefore, the object of the present invention is to provide a rolling force sensor bearing with a rotation sensor without fear of erroneously detecting the origin of rotation of a rolling ring even if it is incorporated and used in a device that generates a magnetic field. It is to be.

課題を解決するための手段  Means to solve the problem

[0008] 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。  [0008] In order to solve the above-mentioned problems, the present invention has first and second detection portions concentric to each other in a ring shape, which are concentric rings, on the rotation ring of the inner and outer rings. The first portion to be detected is alternately magnetized in different magnetic poles in the circumferential direction, and the second portion to be detected is at one point in the circumferential direction, either for detecting the origin of rotation of the rotation ring. A magnetic encoder is attached to the magnetic pole of the first magnetic sensor, and the first and second sensor elements are fixed, each detecting a change in each magnetic flux from the first and second detection portions as the magnetic encoder rotates. A rolling bearing with a rotation sensor which is mounted on a bearing ring, detects the rotational speed of the rotating bearing ring with the first sensor element, and detects the origin of rotation of the rotating bearing ring with the second sensor element. Raw inspection at one point in the circumferential direction of the second detected part of the magnetic encoder The remaining circumferential portion other than the magnetized point detection magnetized portion of the use, employing the configuration magnetized pole and different magnetic poles of the reference point detection magnetized portion.

[0009] 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。 [0010] 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。 That is, the remaining circumferential portion other than the origin detection magnetized portion magnetized for origin detection at one point in the circumferential direction of the second detected portion of the magnetic encoder is used for the origin detection. By magnetizing the magnetic pole different from the magnetic pole of the magnetizing part, the remaining circumferential part positively generates the magnetic flux of the magnetic pole different from the origin detection magnetizing part, and is incorporated into the device generating the magnetic field and used. And the second sensor element that detects a change in the magnetic flux from the second detected portion erroneously detects the origin of the rotation of the rotating race, even if the leakage flux slightly passes through the remaining circumferential portion. I did not. The origin-detecting magnetized portion for the second detected portion is separately formed, and a depressed portion is formed in the corresponding portion of the origin-detecting magnetized portion in the circumferential direction of the second detected portion. The circumferential position of the origin detection magnetized portion can be visually confirmed by providing it and adhering the origin detection magnetized portion formed separately as described above to the recessed portion. In addition, it is possible to magnetize the origin detection magnetizing section efficiently before bonding.

[0011] 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 することによつても、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 separately formed, and the origin detecting magnetized portion is stepped in a convex shape in the circumferential direction of the second detected portion. The circumferential direction of the origin detection magnetized portion can also be formed by bonding the remaining circumferential portion separately formed to the circumferential portion other than the convex step. The position can be checked visually. In addition, the remaining circumferential portions can be efficiently magnetized before bonding.

発明の効果  Effect of the invention

[0012] 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 周方向部分力 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 circumference other than the origin detection magnetized portion magnetized for origin detection at one point in the circumferential direction of the second detected portion of the magnetic encoder. By magnetizing the direction portion to a magnetic pole different from the magnetic pole of this origin detection magnetized portion, the magnetic flux of a magnetic pole different from the remaining circumferential direction partial force origin detection magnetized portion is generated actively. Therefore, the second sensor element is used by being incorporated in a device that generates a magnetic field, and that detects a change in magnetic flux from the second detected portion even if its leakage flux slightly passes through the remaining circumferential portion. However, the origin of rotation of the rotating race can be prevented from being detected erroneously.

[0013] 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 detection magnetized portion of the second detected portion is separately formed, and a depressed portion is provided in the corresponding portion of the origin detected magnetized portion in the circumferential direction of the second detected portion. The circumferential position of the origin detection magnetized portion can be visually confirmed by bonding the origin detection magnetized portion separately formed on the recessed portion. The origin detection magnetized portion can also be efficiently magnetized prior to bonding.

[0014] 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つ 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。 図面の簡単な説明 The remaining circumferential portion of the second detected portion is separately formed, and the magnetized portion for origin point detection is formed with steps in a convex shape in the circumferential direction of the second detected portion. By bonding the remaining separately formed circumferential portion to the circumferential portion other than the convex step, the circumferential position of the origin detection magnetized portion can be visually observed. You can check it with The remaining circumferential portions can be efficiently magnetized before bonding. Brief description of the drawings

[0015] [図 1]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  [FIG. 1] A longitudinal sectional view showing a rolling sensor with a rotation sensor according to a first embodiment.

[図 2]図 1の磁気エンコーダを示す外観斜視図  [FIG. 2] An external perspective view showing the magnetic encoder of FIG.

[図 3]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  [FIG. 3] a and b are graphs showing changes in magnetic flux detected by the first and second sensor elements in FIG. 1, respectively.

[図 4]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. 4] An appearance perspective view showing a first modification of the magnetic encoder of FIG.

[図 5]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  [FIG. 5] An exploded perspective view showing a second modification of the magnetic encoder of FIG.

[図 6]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  [FIG. 6] An exploded perspective view showing a third modification of the magnetic encoder of FIG.

[図 7]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  [FIG. 7] A longitudinal sectional view showing a rolling sensor with a rotation sensor according to a second embodiment.

[図 8]図 7の磁気エンコーダを示す外観斜視図  [FIG. 8] An external perspective view showing the magnetic encoder of FIG.

符号の説明  Explanation of sign

[0016] 1 内輪 [0016] 1 inner ring

la 段差部  la step

2 外輪  2 Outer ring

3 ボーノレ  3 Bonore

4 保持器  4 Retainer

5 シ—ノレ  5 Conere

6 磁気エンコーダ  6 Magnetic encoder

6a, 6b 被検出部  6a, 6b detection part

7 センサユニット  7 Sensor unit

8 芯金  8 core metal

9a 原点検出用着磁部  9a Magnetizing unit for home position detection

9b 残りの円周方向部分  9b Remaining circumferential part

10 金属ケース  10 metal case

11 樹脂ケース  11 resin case

11a 鍔  11a 鍔

12a、 12b センサ素子  12a, 12b sensor element

13 窪み部 14 凹段差部 13 hollow part 14 concave step

発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION

[0017] 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に磁気ェンコ一 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が装着されてレ、る。  Hereinafter, an embodiment of the present invention will be described based on the drawings. 1 to 3 show a first embodiment. The rolling bearing with rotation sensor is a deep groove ball bearing for supporting the main shaft of the motor, and as shown in FIG. 1, in the bearing space between the inner ring 1 as the rotating race and the outer ring 2 as the fixed race, Is held by the cage 4 and one end of the bearing space is sealed by the seal 5, and the magnetic encoder 6 is attached to the inner ring 1 on the side opposite to the side sealed by the seal 5. A sensor unit 7 is attached to detect a change in magnetic flux as the encoder 6 rotates.

[0018] 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 bonding a magnetic material with rubber and is formed into a cylindrical shape, and is vulcanized on the outer diameter surface of the core metal 8 fixed by press fitting to the outer diameter surface end of the inner ring 1. It is glued. As shown in FIG. 2, the magnetic encoder 6 has a first detection portion 6a and a second detection portion 6b axially adjacent to each other, and the first detection portion 6a extends in the circumferential direction. The second detection part 6b is alternately magnetized in the S pole as the origin detection magnetizing part 9a for rotation of the inner ring 1 at one place in the circumferential direction. And the remaining circumferential portion 9b is magnetized to a different N pole. The first and second detection target portions 6a and 6b are formed to have the same thickness, and the origin detection magnetized portion 9a of the second detection target portion 6b which is the S pole is the same as the first detection target portion 6a. It runs in the axial direction with the same width as one S pole.

[0019] 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、磁気ェンコ 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レ、る。  As shown in FIG. 1, the sensor unit 7 is provided between the metal case 10 on the outer diameter side and the resin case 11 on the inner diameter side fixed by press-fitting to the inner diameter surface end of the outer ring 2. The first and second sensor elements 12a and 12b are incorporated, and the first sensor element 12a is a first detected portion 6a of the magnetic encoder 6 and the second sensor element 12b is a second detected element. It is fixed by a mold so as to face the portion 6 b in the radial direction. The inward ridge 11 a is provided at the end of the resin case 11 parallel to the core metal 8 of the magnetic encoder 6, and between the core metal 8 of the magnetic encoder 6 and the resin case 11 of the sensor unit 7. In addition, a labyrinth gap is formed to seal the bearing space.

[0020] 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 W 、 W 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。 FIGS. 3 (a) and 3 (b) show changes in the magnetic flux detected by the first and second sensor elements 12a and 12b, respectively, when the magnetic encoder 6 rotates with the inner ring 1. . Figure 3 (a) As shown, the magnetic flux detected by the first sensor element 12a changes in a wavelike manner to the N pole side and the S pole side each time the N pole and the S pole of the first detected portion 6a pass alternately. When the magnetic flux exceeds the threshold values W and W of the N pole side and the S pole side, the rotation units are integrated and the rotation speed is detected.

Nl S1  Nl S1

[0021] 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 W を越え、さらに磁束が N極側へ戻って閾値 W を越えたときに、  Further, as shown in FIG. 3 (b), the magnetic flux detected by the second sensor element 12b is detected only when the origin detection magnetized portion 9a of the second detection target 6b passes through. It changes to the side and is held constant on the N pole side while the remaining circumferential portion 9b passes. In this case, when the magnetic flux changes to the south pole side and exceeds the threshold W and the magnetic flux returns to the north pole side and exceeds the threshold W,

S2 N2  S2 N2

原点の通過が検出される。  Passage of the origin is detected.

[0022] 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, an origin detection magnetized portion 9a, which is the S pole of the second detection portion 6b, is provided axially adjacent to one N pole of the first detection portion 6a. ing.

[0023] 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つ 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ょレ、。  FIG. 5 shows a second modification of the magnetic encoder 6. In this modification, the origin detection magnetized portion 9a of the second detection portion 6b is formed as a separate body in which a magnetic material is bonded by rubber, and the circumferential direction of the second detection portion 6b. A recessed portion 13 is provided at one location, and a magnetizing portion 9a for origin detection separately formed is bonded to the core metal 8 with an adhesive at the recessed portion 13, and the magnetization for origin detection is formed. The part 9a is magnetized to the S pole before bonding. The origin detection magnetized portion 9a may be magnetized after bonding.

[0024] 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 detection portion 6b is formed as a separate body in which a magnetic material is bonded with rubber, and the second detection portion 6b detects the origin. The magnetized portion 9a is formed to have a step in a convex shape, and the remaining circumferential portion 9b separately formed is a cored bar at the recessed step portion 14 in the circumferential direction other than the origin detection magnetized portion 9a. The remaining circumferential portion 9b is magnetized to the N pole prior to bonding. The remaining circumferential portion 9b may be magnetized after bonding.

[0025] 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。 [0026] この実施形態では、前記内輪 1の外径面の段差部 la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。 [0025] Figures 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, and as shown in FIG. 7, in the bearing space between the inner ring 1 to be the rotating ring and the outer ring 2 to be the fixed ring. Is held by the holder 4, and one end of the bearing space is sealed by the seal 5. In this embodiment, a magnetic material is bonded with rubber to the side surface of the core metal 8 of the L-shaped cross section fixed by press fitting to the step portion la of the outer diameter surface of the inner ring 1 and molded into a disk shape. Magnetic encoder 6 is bonded by vulcanization. As shown in FIG. 8, in the magnetic encoder 6, the first detection target 6 a is alternately magnetized in the circumferential direction to the N pole and the S pole, and one point in the circumferential direction is a magnetization for origin point detection. It forms so that the 2nd to-be-detected part 6b which is magnetized to S pole as the part 9a, and the remaining circumferential direction part 9b is magnetized to N pole is adjacent to the outer peripheral side and the inner peripheral side in the radial direction. It is done. The origin detection magnetized portion 9a or the remaining circumferential portion 9b can be formed separately as in the first embodiment.

[0027] 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レヽる。  Further, as shown in FIG. 7, the sensor unit 7 is provided with the first and second sensor elements 12 a and 12 b in a metal case 10 fixed by press-fitting to the outer diameter surface end of the outer ring 2. The first and second sensor elements 12a and 12b are fixed in a mold so as to axially face the first and second detection portions 6a and 6b of the magnetic encoder 6, respectively. ing. Also in this embodiment, a labyrinth gap for sealing the bearing space is formed between the metal core 8 of the L-shaped cross section of the magnetic encoder 6 and the sensor unit 7 and is formed.

[0028] 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ゃ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 modifications, the magnetic encoder and the circumferential portion for the origin detection magnetized portion of the second detection target separately formed and the remaining circumferential portion are coupled with a magnetic material by rubber. The magnetic material is bonded with a resin such as a thermoplastic resin and injection molded, and may be attached to the core metal by adhesion, press-fitting or the like. In addition, the second detection magnetized portion for detecting the origin point was S pole, and the remaining part in the circumferential direction was N pole, but the original inspection magnetized portion is N pole and the remaining circles are The circumferential portion may be magnetized to the S pole.

[0029] 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 の転がり軸受ゃ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。  Furthermore, in each of the above-described embodiments, although the rolling bearing is a deep groove ball bearing in which the inner ring is a rotating race, the rolling bearing with a rotation sensor according to the present invention is another type of rolling such as a roller bearing. It can be applied to bearings and double-row rolling bearings, and it can also be applied to rolling bearings whose outer ring is a rotating race.

Claims

請求の範囲 The scope of the claims [1] 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。  [1] Among the races of the inner and outer rings, the rotation race has concentric ring-shaped first and second detection parts adjacent to each other, and the first detection parts alternate in the circumferential direction And a second encoder for detecting the origin of rotation of the rotating race at one point in the circumferential direction, and a magnetic encoder magnetized in any of the magnetic poles is attached to the second magnetic pole. First and second sensor elements for detecting changes in the magnetic fluxes from the first and second detected parts as the magnetic encoder rotates are attached to a fixed bearing ring, and In a rolling bearing with a rotation sensor, which detects a rotational speed with the first sensor element and detects an origin of rotation of the rotary ring with the second sensor element, a second detected portion of the magnetic encoder Of the magnetized portion for home position detection magnetized for home position detection at one point in the circumferential direction of the 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. [2] 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。  [2] The origin detection magnetized portion of the second detected portion is separately formed, and the depressed portion is formed in the corresponding portion of the origin detected magnetized portion in the circumferential direction of the second detected portion. 2. The rolling bearing with a rotation sensor according to claim 1, wherein the magnetizing portion for origin point detection formed by the separate body is attached to the recessed portion. [3] 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。  [3] The remaining circumferential portion of the second detected portion is separately formed, and the origin detecting magnetized portion is stepped in a convex shape in the circumferential direction of the second detected portion. 2. The rolling bearing with a rotation sensor according to claim 1, wherein the remaining circumferential portion separately formed is bonded to a circumferential portion other than the convex-shaped step.
PCT/JP2007/050959 2006-01-25 2007-01-23 Rolling bearing with rotation sensor Ceased WO2007086363A1 (en)

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