WO2018079471A1 - Dispositif de détection d'angle - Google Patents

Dispositif de détection d'angle Download PDF

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Publication number
WO2018079471A1
WO2018079471A1 PCT/JP2017/038150 JP2017038150W WO2018079471A1 WO 2018079471 A1 WO2018079471 A1 WO 2018079471A1 JP 2017038150 W JP2017038150 W JP 2017038150W WO 2018079471 A1 WO2018079471 A1 WO 2018079471A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
detection device
circuit board
angle detection
electric circuit
Prior art date
Application number
PCT/JP2017/038150
Other languages
English (en)
Japanese (ja)
Inventor
小池　孝誌
靖之 福島
裕也 山口
Original Assignee
Ntn株式会社
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株式会社 filed Critical Ntn株式会社
Publication of WO2018079471A1 publication Critical patent/WO2018079471A1/fr

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    • 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

Definitions

  • the present invention relates to an angle detection device capable of detecting a rotation angle, for example, a technique applied to an angle detection device capable of high-resolution output or absolute angle detection.
  • a bearing with a rotation sensor disclosed in Patent Document 1 a plastic film (flexible substrate) mounted on a rotating sensor fitted to an inner ring of a rolling bearing and an annular sensor housing fixed to a core metal fitted to an outer ring.
  • the detection elements on the electric circuit board formed in (1) are arranged so as to face each other in close proximity.
  • the rotation detection device and the bearing with the rotation detection device disclosed in Patent Document 2 include two magnetic encoders having different numbers of magnetic poles and two magnetic sensors for detecting the magnetic fields, and the absolute angle is determined from the phase difference between them. Is detected.
  • two magnetic encoders are arranged in the rotation axis direction on the outer diameter surface of the ring-shaped metal core that is press-fitted into the outer diameter surface of one end surface of the inner ring. Arranged side by side.
  • the two magnetic sensors are integrated as a sensor module together with a signal processing circuit, and are resin-molded in a state of being inserted inside a ring-shaped metal sensor housing. It is attached to the inner diameter surface.
  • JP 2004-125455 A Japanese Patent No. 5081553
  • the bearing with a rotation sensor disclosed in Patent Document 1 curves a film-like electric circuit board coated with polyimide resin to an inner circumferential surface of an arc-shaped groove provided in an annular sensor housing fixed to an outer ring. Is attached.
  • a resin mold is applied to flow and solidify the resin material.
  • the film-like electric circuit board has a problem that the unit price is higher than that of the epoxy board.
  • a signal processing circuit including two magnetic sensors is resin-molded and integrated as a sensor module, and then the inner diameter of one end portion of the outer ring via the sensor housing Attached to the surface.
  • a fluid resin material for example, epoxy resin
  • the electric circuit board for example, epoxy resin
  • the gap around the electric circuit board for example, a fluid resin material
  • man-hours such as a degassing step (evacuation) are required in the middle so that cavities and bubbles do not remain, and there is a problem that the assembly cost becomes high.
  • the present invention solves the above-described problems, and provides an angle detection device that can fix an electric circuit board without performing resin molding, is easy to manufacture, and can reduce assembly man-hours and manufacturing costs.
  • the purpose is to provide.
  • a magnetic encoder having a magnetic track in which N poles and S poles are alternately arranged is fixed to a rotating wheel of a bearing, and magnetically positioned at a position facing the magnetic track of the magnetic encoder via a gap.
  • An angle detection device in which an electric circuit board on which the magnetic sensor is mounted is fixed to a fixed ring of the bearing so that the sensor is disposed, The electric circuit board is fixed to a sensor housing integrally supported with the fixed ring by a fixing element made of a fixing tool or an adhesive.
  • the “fixing tool” means a part for fixing an object, for example, a shaft-like part that fits into a hole of a screw member, a rivet, a press-fit pin or the like and has a fixing action. Even if it exists, the clip etc. which pinch
  • the electric circuit board is fixed by the fixing element, the electric circuit board can be fixed without performing resin molding, and the manufacture of the angle detection device is simple, and the number of assembly steps and the manufacturing cost are reduced. Is possible.
  • the fixture may be a screw member.
  • the “screw member” includes bolts, screws, nuts, and the like, as well as similar members.
  • the fixing by the screw member can be fixed by a tightening operation by rotation, so that the fixing operation is simpler and can be detachably fixed. Therefore, in the case of fixing with a screw member, the replacement is easy even when the electric circuit board fails.
  • the electric circuit board may be fixed to the sensor housing in a detachable manner. If the electric circuit board is fixed detachably without being limited to the screw member, the electric circuit board can be easily replaced even if it breaks down.
  • a flat surface perpendicular to the radial direction and a radial hole or groove communicating with the flat surface are formed on the outer peripheral surface of the annular sensor housing, and the circuit board is fixed to the flat surface.
  • the magnetic sensor may face the magnetic track of the magnetic encoder through the hole or groove.
  • the magnetic sensor may be housed in the hole or groove, or may be outside the hole or groove and face the hole or groove.
  • the electric circuit board may have a quadrangular shape, and may be disposed along the axial direction of the bearing, and the axial width of the electric circuit board may be equal to or less than the width dimension of the magnetic encoder. If the electric circuit board has a quadrangular shape and the axial width thereof is equal to or smaller than the width dimension of the magnetic encoder, the axial dimension of the angle detection device can be reduced, and the space can be saved.
  • the magnetic encoder has two magnetic tracks having different numbers of magnetic poles, and the magnetic sensor detects the two magnetic tracks and outputs a signal indicating an absolute angle of the rotating wheel. You may make it have. Even in such an angle detection device for detecting an absolute angle, the present invention can omit the resin molding step and can be provided at low cost.
  • FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. It is explanatory drawing which shows the modification of a magnetic sensor. It is sectional drawing of the angle detection apparatus which concerns on other embodiment of this invention. It is the front view which looked at the same angle detection apparatus in the arrow VI direction of FIG. It is sectional drawing of the angle detection apparatus which concerns on other embodiment of this invention. It is explanatory drawing of the magnetic pole of the magnetic encoder in the same angle detection apparatus.
  • FIG. 1 is a longitudinal sectional view of the angle detection device
  • FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG. In FIG. 3, the description of the metal ring 11 described later is omitted.
  • This angle detection device 1 has an N pole and an S pole on the outer diameter surface of the end of the rotating wheel 2 in the rolling bearing 7 composed of the rotating wheel 2, the fixed wheel 3, the rolling element 4, the cage 5, and the seal 6.
  • Alternately magnetized magnetic encoders 8 are fixed in a fitted state.
  • the rotating wheel 2 is an inner ring and the fixed wheel 3 is an outer ring.
  • a sliding bearing may be used.
  • the magnetic encoder 8 includes a cored bar 9 and a magnetic track member 10.
  • the magnetic track member 10 is formed by integrally molding a cored bar 9 with a rubber kneaded with magnetic powder in a mold together with a cored bar 9 or by vulcanizing and bonding a plastic and magnetic powder mixed together.
  • the N pole and the S pole are alternately magnetized in the circumferential direction.
  • An annular sensor housing 12 is concentrically attached to the metal ring 11 that is fixed in a fitted state on the inner diameter surface of the end portion of the fixed ring 3.
  • a resin may be used as a material of the sensor housing 12.
  • a flat surface 12a perpendicular to the radial direction and a radial hole 12b communicating with the flat surface 12a are formed on the outer peripheral surface of the sensor housing 12.
  • a groove may be formed instead of the hole 12b.
  • the electric circuit board 14 on which the magnetic sensor 13 is mounted is fixed to the flat surface 12a with the fixture 15 so that the magnetic sensor 13 is accommodated in the hole 12b.
  • the fixture 15 is made of a screw that is a screw member.
  • Fixing by the fixing tool 15 is performed on both sides of the electric circuit board 14.
  • a screw hole (not shown) is machined in the flat surface 12a, and the fixture 15 made of the screw member is screwed into the screw hole.
  • the notch 11a is provided in the metal ring 11 to avoid the interference.
  • the electrical circuit board 14 is obtained by mounting electrical components on, for example, a glass epoxy printed board, for example, having a quadrangular shape, and the connector 16 is mounted on the surface opposite to the mounting surface of the magnetic sensor 13. If the axial width of the electric circuit board 14 is set to be equal to or smaller than the width dimension of the magnetic encoder 8, the axial dimension of the angle detection device 1 can be reduced, and space saving is possible.
  • the angle detection device 1 of this configuration since the electric circuit board 14 is fixed by the fixing member 15 made of a screw member, the conventional resin molding process is not required, the number of assembling steps is reduced, and the manufacturing cost is reduced. To do. Further, since the electric circuit board 14 is fixed by a fixing member 15 made of a screw member, the electric circuit board 14 can be easily replaced even when the electric circuit board 14 breaks down.
  • the magnetic encoder 8 and the electric circuit board 14 are arranged on one end surface of the rolling bearing 7, oil repellent and water repellent are provided so that no problem occurs even if the grease of the rolling bearing 7 adheres to the surface of the electric circuit board 14.
  • a liquid repellent having an action may be applied to the surface of the electric circuit board 14 as well. Further, instead of the liquid repellent, an epoxy resin-based molding agent may be partially brushed.
  • the magnetic sensor 13 outputs a pulse-shaped rectangular signal as the magnetic encoder 8 rotates.
  • the magnetic signal is electrically output as follows. It is also possible to use a signal that can be multiplied by 2 to obtain a high-resolution rectangular signal.
  • FIG. 4 shows an example of the magnetic sensor 33 that multiplies and obtains a high-resolution rectangular signal.
  • the magnetic sensor 33 includes a sensor array including a plurality of individual magnetic sensors 33a and 33b, and signal processing for generating an output signal capable of detecting the rotational speed and direction of the rotating wheel 2 from the outputs of the magnetic sensors 33a and 33b.
  • a sensor module in which the circuit 33c is included in one package is used.
  • the magnetic sensor 33 according to the present embodiment outputs two-layer output signals of multiplied A phase and B phase. The electrical phase difference between the A-phase output signal and the B-phase output signal output from the magnetic sensor 33 is 90 degrees.
  • the signal processing circuit 33c can be programmed from the outside to set the resolution in accordance with the count multiplication or the magnetic pole width of the magnetic track of the magnetic track member 10. For example, even if the track magnetic pole width of the magnetic track member 10 is changed, the magnetic sensor 33 can be adjusted by programming, and can flexibly cope with a specification change.
  • the MPS40S manufactured by NTN-SNR ROULEMENTS disclosed in Non-Patent Document 1 is employed, and the magnetic track member 10 is also formed correspondingly. ing.
  • FIG. 5 shows a cross-sectional view of an angle detection device 17 according to another embodiment of the present invention
  • FIG. 6 shows a view taken along arrow VI of FIG.
  • the configuration of the angle detection device 17 is the same as that of the angle detection device 1 shown in FIG. 1 except for the matters to be specifically described.
  • the sensor housing 18 covers the rolling bearing 7 around the outer periphery of the fixed ring 3 as the outer ring.
  • the metal ring 11 is omitted.
  • a flat surface 18a perpendicular to the radial direction and a radial hole 18b communicating with the flat surface 18a are formed on the outer peripheral surface of the sensor housing 18, and a magnetic field is formed in the hole 18b.
  • the electric circuit board 14 on which the magnetic sensor 13 is mounted is fixed to the flat surface 18a with screws 15 so that the sensor 13 is accommodated.
  • a groove may be provided instead of the hole 18b.
  • a metal material iron-based, aluminum-based, etc.
  • each operation and effect described in the previous embodiment can be obtained.
  • the magnetic sensor 33 capable of obtaining a high-resolution rectangular signal by multiplication as described with reference to FIG. 4 may be used.
  • FIG. 7 shows a sectional view of still another embodiment of the angle detection device
  • FIG. 8 shows the magnetic encoder and the magnetic sensor.
  • the magnetic encoder 20 of the angle detection device 19 of this embodiment is composed of a magnetic track member 22 (first magnetic track 22a, second magnetic 22b) having a cored bar 21 and two rows of magnetic tracks 22a, 22b.
  • the magnetic track 22a and the second magnetic track 22b have different numbers of magnetic poles.
  • the first magnetic track 22a is magnetized with 32 pole pairs and the second magnetic track 22b is magnetized with 31 pole pairs.
  • the magnetic sensor 13 detects the magnetic fluxes of the first magnetic track 22a and the second magnetic track 22b, and detects the absolute angle inside the magnetic sensor 13 using the difference between the one pole pair.
  • the magnetic sensor 13 includes two individual magnetic sensors (not shown) constituting the magnetic tracks 22a and 22b and a signal processing circuit (both not shown), and the signal processing circuit includes:
  • the absolute angle is calculated as follows.
  • the signal processing circuit detects this phase difference by a phase difference detection unit, and calculates an absolute angle in one rotation section by an angle calculation unit based on the phase difference.
  • the electric circuit board 14 can be fixed with a fixture 15 such as a screw member, and the resin molding step can be omitted, so that it can be provided at low cost.
  • An adhesive may be used instead of the fixture 15.
  • the electric circuit board 14 is fixed by the fixing member 15 such as a screw member.
  • the fixing member 15 such as a rivet or a pin may be used instead of the screw member.
  • it may be fixed by other fixing methods such as bonding with an adhesive.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne un dispositif de détection d'angle grâce auquel une carte de circuit électrique peut être fixée sans effectuer de moulage de résine, simple à fabriquer et grâce auquel le temps d'assemblage et les coûts de fabrication peuvent être réduits. Un codeur magnétique (8) possédant une piste magnétique dans laquelle N pôles et S pôles sont disposés en alternance est fixé à une roue rotative (2) d'un palier à roulement (7). Une carte de circuit électrique (14) sur laquelle est monté un capteur magnétique (13) est fixée à une roue fixe (2) du palier à roulement (7) de telle sorte que le capteur magnétique (13) soit disposé dans une position faisant face à un élément de piste magnétique (10) du codeur magnétique (8) à travers un espace. La carte de circuit électrique (14) est fixée au moyen d'un dispositif de fixation tel que des vis ou un autre élément fileté, ou au moyen d'un adhésif, à un boîtier de capteur (12) supporté d'un seul tenant avec la roue fixe (2).
PCT/JP2017/038150 2016-10-31 2017-10-23 Dispositif de détection d'angle WO2018079471A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016212743A JP2018072192A (ja) 2016-10-31 2016-10-31 角度検出装置
JP2016-212743 2016-10-31

Publications (1)

Publication Number Publication Date
WO2018079471A1 true WO2018079471A1 (fr) 2018-05-03

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WO (1) WO2018079471A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102536972B1 (ko) * 2020-01-17 2023-05-26 주식회사 일진글로벌 복수의 센싱부를 갖는 휠속도 센서를 구비하는 휠베어링

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004004028A (ja) * 2002-04-12 2004-01-08 Ntn Corp アブソリュートエンコーダ付軸受
JP2007192249A (ja) * 2006-01-17 2007-08-02 Ntn Corp 複列転がり軸受
JP2010066142A (ja) * 2008-09-11 2010-03-25 Ntn Corp 回転検出装置および回転検出装置付き軸受
JP2011027719A (ja) * 2009-06-30 2011-02-10 Ntn Corp 自動車駆動用モータの回転角度検出装置および回転角度検出装置付き軸受
JP2014005898A (ja) * 2012-06-26 2014-01-16 Ntn Corp 回転センサ付軸受
JP2016016479A (ja) * 2014-07-08 2016-02-01 Ntn株式会社 関節駆動装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004004028A (ja) * 2002-04-12 2004-01-08 Ntn Corp アブソリュートエンコーダ付軸受
JP2007192249A (ja) * 2006-01-17 2007-08-02 Ntn Corp 複列転がり軸受
JP2010066142A (ja) * 2008-09-11 2010-03-25 Ntn Corp 回転検出装置および回転検出装置付き軸受
JP2011027719A (ja) * 2009-06-30 2011-02-10 Ntn Corp 自動車駆動用モータの回転角度検出装置および回転角度検出装置付き軸受
JP2014005898A (ja) * 2012-06-26 2014-01-16 Ntn Corp 回転センサ付軸受
JP2016016479A (ja) * 2014-07-08 2016-02-01 Ntn株式会社 関節駆動装置

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