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WO2023286406A1 - Torque measurement device, magnetic field generation device for torque measurement device, and magnetic field detection device for torque measurement device - Google Patents

Torque measurement device, magnetic field generation device for torque measurement device, and magnetic field detection device for torque measurement device Download PDF

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Publication number
WO2023286406A1
WO2023286406A1 PCT/JP2022/017711 JP2022017711W WO2023286406A1 WO 2023286406 A1 WO2023286406 A1 WO 2023286406A1 JP 2022017711 W JP2022017711 W JP 2022017711W WO 2023286406 A1 WO2023286406 A1 WO 2023286406A1
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WO
WIPO (PCT)
Prior art keywords
magnetic field
driven
side flange
flange
magnet
Prior art date
Application number
PCT/JP2022/017711
Other languages
French (fr)
Japanese (ja)
Inventor
幸弘 小林
弘貴 高橋
Original Assignee
ミネベアミツミ株式会社
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 ミネベアミツミ株式会社 filed Critical ミネベアミツミ株式会社
Priority to CN202280059264.7A priority Critical patent/CN117897602A/en
Publication of WO2023286406A1 publication Critical patent/WO2023286406A1/en

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating

Definitions

  • the present invention relates to a torque measuring device, a magnetic field generating device for a torque measuring device, and a magnetic field detecting device for a torque measuring device.
  • a torque measuring device is provided on the rotating shaft between the rotating body and the load, and measures the rotational torque between the rotating body and the load in a non-contact manner.
  • a shaft torque measuring device for measuring the shaft torque of a drive shaft that transmits the power of an automobile engine to wheels (see, for example, Patent Document 1).
  • the direction of rotation is determined by signals of the A phase and the B phase detected by two magnetic sensors such as Hall elements arranged so as to face each other around a ring-shaped magnetic encoder.
  • the direction and amount of twist of the drive shaft are measured from the difference between the signals of both phases B and B, and the shaft torque is calculated from the amount of twist.
  • the present invention has been made in view of the above background, and an object of the present invention is to provide a torque measuring device that can be made even more compact than before.
  • the torque measuring device of the present invention provides a driving side flange, a driven side flange, and between the driving side flange and the driven side flange, the same torque as both the driving side flange and the driven side flange.
  • a strain body provided integrally on the axis and having a strain gauge attached thereto, a magnet provided at a predetermined position on the peripheral side of the driven side flange on the outer peripheral side, and a disk-shaped end surface of the driven side flange integrally.
  • a first sensing element for sensing a first magnetic field generated by said magnet during rotation of said driven flange; and said multipolar magnetic ring rotating with said driven flange.
  • a second sensing element for sensing a second magnetic field generated by said multi-pole magnetic ring during rotation, said first sensing element being the sum of said first magnetic field and said second magnetic field. exceeds a predetermined threshold value, a signal indicating that the driven flange has made one rotation is output.
  • the magnetic field generating device for the torque measuring device of the present invention includes: a driving side flange, a driven side flange, and between the driving side flange and the driven side flange, both the driving side flange and the driven side flange a strain-generating body integrally provided on the same axis as the magnet, a magnet arranged opposite to the detection device and provided at a predetermined position on the peripheral side surface of the driven side flange on the outer peripheral side to generate a magnetic field; an annular multi-pole magnetic ring integrally attached to the disk-shaped end surface of the driven flange for generating a magnetic field.
  • a magnetic field detection device for a torque measuring device comprises a first detection element for detecting a magnetic field generated by a magnet during rotation of a driven flange, and and a second detection element for detecting a magnetic field generated by the multipolar magnetic ring, wherein the sum of the magnetic field generated by the magnet and the magnetic field generated by the multipolar magnetic ring is a predetermined threshold. is exceeded, a signal indicating that the driven-side flange has made one rotation is output.
  • FIG. 1 is a perspective view showing the overall configuration of a torque measuring device according to one embodiment of the present invention
  • FIG. FIG. 4 is a schematic front view showing the arrangement of magnets of Hall sensors, Hall elements, TMR elements, and multipolar magnetic rings in the torque measuring device according to one embodiment of the present invention
  • 1 is a schematic diagram showing the configuration of a multipolar magnetic ring used in a torque measuring device according to an embodiment of the invention
  • FIG. 4 is a pulse waveform diagram showing A-phase, B-phase and Z-phase pulses detected by the torque measuring device according to the embodiment of the present invention
  • Magnetic field strength (A) emitted by the multipolar magnetic ring of the torque measuring device according to one embodiment of the present invention, magnetic field strength (B) emitted by the magnet of the Hall sensor, and the multipolar magnetic ring and the Hall sensor 3 is a waveform diagram showing the relationship between the total strength of the magnetic fields emitted by the magnets and the threshold.
  • FIG. 1 is a perspective view showing the overall configuration of a torque measuring device according to one embodiment of the invention.
  • FIG. 2 is a schematic front view showing the arrangement of magnets of Hall sensors, Hall elements, TMR elements, and multipolar magnetic rings in a torque measuring device according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing the configuration of a multipolar magnetic ring used in the torque measuring device according to one embodiment of the present invention;
  • FIG. 4 is a pulse waveform diagram showing A-phase, B-phase and Z-phase pulses detected by the torque measuring device according to the embodiment of the present invention.
  • FIG. 1 is a perspective view showing the overall configuration of a torque measuring device according to one embodiment of the invention.
  • FIG. 2 is a schematic front view showing the arrangement of magnets of Hall sensors, Hall elements, TMR elements, and multipolar magnetic rings in a torque measuring device according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing the configuration of a multipolar magnetic ring used in the torque measuring device
  • FIG. 5 shows the strength (A) of the magnetic field emitted by the multipolar magnetic ring of the torque measuring device according to one embodiment of the present invention, the strength (B) of the magnetic field emitted by the magnet of the Hall sensor, and the multipolar magnetic
  • FIG. 4 is a waveform chart showing the relationship between the total strength of the magnetic field emitted by the magnets of the ring and the Hall sensor and the threshold.
  • the direction in which the axis X of the torque measuring device 100 extends will be referred to as the rotation axis X direction or the axis X direction.
  • the direction of arrow a in the direction of the rotation axis X is the drive side or left side
  • the direction of arrow b is the driven side or right side.
  • the direction of arrow c moving away from the axis X is defined as the outer peripheral side
  • the direction of arrow d approaching the axis X is defined as the inner peripheral side.
  • the upper side (the direction of arrow e) and the lower side (the direction of arrow f) in the torque measuring device 100 mean the vertical relationship of the torque measuring device 100 in the gravitational direction on the drawing.
  • the torque measuring device 100 includes a driving side flange 110, a driven side flange 120, and a predetermined wall thickness and a predetermined outer diameter between the driving side flange 110 and the driven side flange 120. and a hollow cylindrical strain body 130 having a However, in FIG. 1 , the strain body 130 is hidden between the driving side flange 110 and the driven side flange 120 .
  • the drive-side flange 110 is a disk-shaped member.
  • the drive-side flange 110 is provided with a plurality of screw holes 112 at equal intervals on a concentric circle in a state of penetrating the drive-side flange 110 .
  • an end surface 110s on the left side (arrow a direction) of the drive-side flange 110 in the figure is connected to a measuring roller, a dynamometer, a brake mechanism, etc. of a chassis dynamo rotated by the wheels of an automobile, for example.
  • a drive-side connecting member (not shown) is connected through a plurality of screw holes 112 .
  • the drive-side flange 110 has its peripheral side surface covered by a cover body 152 having an annular half-split structure provided on the fixed base 150 .
  • the cover body 152 does not cover the end surface 110s of the drive-side flange 110, but exposes it.
  • the cover body 152 is fixed to the fixed base 150 by screws (not shown) or the like.
  • the driven side flange 120 is a disc-shaped member having the same outer diameter as the driving side flange 110 .
  • the drive-side flange 110 and the driven-side flange 120 are integrally formed via a strain-generating body 130 provided therebetween. That is, the driving side flange 110, the strain generating body 130, and the driven side flange 120 are integrated with the axis X as the center.
  • the driven side flange 120 is not covered with the cover body 152 and is entirely exposed above the fixed base 150 (in the direction of arrow e).
  • a plurality of screw holes 122 are provided at equal intervals on a concentric circle while passing through the driven side flange 120.
  • a driven flange 120 is coupled to a load member (not shown) through a plurality of threaded holes 122 .
  • the driven-side flange 120 has a plurality of bottomed holes (hereinafter simply referred to as “holes”) at regular intervals with respect to a circumferential side surface (hereinafter referred to as "peripheral side surface") 120a. 124 are formed. Light-emitting elements (not shown) such as light-emitting diodes constituting optical sensors (not shown) are embedded in the plurality of holes 124 in the driven side flange 120 .
  • a detection unit 300 as a magnetic field detection device is attached at a predetermined position of the fixed base 150 facing the peripheral side surface 120a of the driven side flange 120 having the hole 124 in which the light emitting element of the optical sensor is embedded.
  • the detection unit 300 is provided with a light-receiving element such as a photodiode that receives light output from the light-emitting element of the optical sensor described above.
  • This optical sensor transmits a signal detected by a later-described strain gauge attached to the strain-generating body 130 between the light-emitting element of the driven-side flange 120 and the light-receiving element of the detection unit 300 without contact.
  • a magnet 161 constituting a hall sensor 160 is embedded in one of the plurality of holes 124 provided in the peripheral side surface 120a of the driven side flange 120 together with the light emitting element (not shown) of the optical sensor described above. there is That is, any one of the plurality of holes 124 of the driven side flange 120 is shared by both the light emitting element and the magnet 161 of the hall sensor 160 .
  • the magnet 161 of the Hall sensor 160 is provided at a mechanical origin for outputting a Z-phase signal when the driven-side flange 120 makes one rotation (one round) by a Hall element 162, which will be described later. .
  • This is for detecting the rotating position of a rotating shaft (not shown) such as a shaft as a load member connected to the driven side flange 120 in the torque measuring device 100 .
  • This Hall sensor 160 is configured in a non-contact manner by a magnet 161 provided on the driven side flange 120 and a Hall element 162 provided on the detection unit 300 .
  • the Hall sensor 160 is a magnetic sensor that uses the Hall effect to convert a first magnetic field generated by a magnet 161 or a first magnetic field generated by a current into an electric signal by a Hall element 162 as a first detection element and outputs the electric signal.
  • an annular multipolar magnetic ring having substantially the same outer diameter as the driven side flange 120 with respect to the end face 120b on the right side (in the direction of the arrow b) in which a plurality of screw holes 122 are formed. 140 are integrally attached.
  • the multipolar magnetic ring 140 rotates simultaneously with the driving side flange 110 and the driven side flange 120 .
  • the outer diameter of the multipolar magnetic ring 140 may be larger or smaller than the outer diameter of the driven side flange 120 .
  • the multipolar magnetic ring 140 is a thin plate and annular ring member, and is a plastic magnetic ring that is lightened so as not to load the integrally attached driven side flange 120 during high-speed rotation.
  • the multipolar magnetic ring 140 is an axial type consisting of a total of 16 poles (groups) in which a plurality of pairs of S poles and N poles are magnetized at equal intervals along the circumferential direction along the end face 140s. is a magnetic ring.
  • the multipolar magnetic ring 140 need not be limited to 16 poles, and may have 8 poles, 24 poles, or more. good.
  • the strain-generating body 130 is a hollow cylindrical member located between the drive-side flange 110 and the driven-side flange 120 and integrally formed therewith.
  • a plurality of strain gauges (not shown) are attached to the inner peripheral surface of the strain generating body 130 .
  • a plurality of strain gauges are connected to form a Wheatstone bridge circuit.
  • the driving side flange 110, the driven side flange 120, and the strain generating body 130 formed therebetween it is necessary for the driving side flange 110, the driven side flange 120, and the strain generating body 130 formed therebetween to receive electric power from the outside when measuring the amount of torque. . Therefore, in the torque measuring device 100, electric power is transmitted from the outside in a non-contact manner, for example, in a rotary transformer format.
  • the detection unit 300 is arranged so as to face the peripheral side surface 120 a of the driven side flange 120 .
  • a Hall element 162 is attached at a position facing the magnet 161 of the Hall sensor 160 embedded in the hole 124 of the peripheral side surface 120 a of the driven side flange 120 .
  • the light receiving element of the optical sensor and the Hall element 162 of the Hall sensor 160 are attached to the circuit board 180 of the detection unit 300 .
  • the detection unit 300 includes a TMR (Tunneling Magneto Resistance) element 170 as a second detection element that detects the magnetic field (second magnetic field) of the multipolar magnetic ring 140 and outputs an A-phase signal and a B-phase signal. is mounted on the circuit board 180 at a position facing the multi-pole magnetic ring 140 .
  • TMR Transmission Magneto Resistance
  • the TMR element 170 is a tunnel magnetoresistive element that utilizes the tunnel magnetoresistive effect.
  • the direction of the magnetic field acting on the TMR element 170 rotates according to the rotation, and the A-phase signal and the B-phase signal which are out of phase with each other are output. do.
  • the B-phase signal is out of phase with the A-phase signal output from the TMR element 170 by 90 degrees.
  • the A-phase signal is output with a phase lead of the B-phase signal by 90 degrees
  • the driven-side flange 120 rotates counterclockwise
  • the A-phase signal is output.
  • the signal is output with a phase delay of 90 degrees from the B-phase signal.
  • the Hall element 162 of the Hall sensor 160 detects the magnetic field of the magnet 161 when it faces the magnet 161 when the driven-side flange 120 rotates, and outputs a Z-phase signal to the driven-side flange 120 one rotation (1 output once per cycle).
  • the position (polarity) of the magnet 161 embedded in the hole 124 of the peripheral side surface 120a of the driven side flange 120 and the multipolar magnetic ring 140 must be aligned.
  • the driven side flange 120 and the multipolar magnetic ring 140 are integrally attached so that the magnetic field peak of the south pole of the magnet 161 and the magnetic field peak of the south pole of the multipolar magnetic ring 140 are aligned.
  • an end surface 140s (FIG. 2) facing the driven side flange 120 has a columnar protrusion protruding leftward (in the direction of arrow a) at an arbitrary position.
  • 142 (FIG. 3) are formed.
  • an end face 120b on the side facing the multipolar magnetic ring 140 is formed with a recess 123 which is a cylindrical hole into which the protrusion 142 described above is fitted.
  • the S pole magnetic field peak of the magnet 161 of the Hall element 162 and the multipolar magnetic ring 140 is set in advance so that the peak of the magnetic field of the S pole of .
  • the magnet 161 of the Hall element 162 and the S pole of the multipolar magnetic ring 140 are arranged adjacent to each other in the X-axis direction of the driven flange 120 .
  • the driven side flange 120, the magnet 161, and the multipolar magnetic ring 140 constitute a magnetic field generating device for the torque measuring device.
  • the TMR element 170 not only the TMR element 170 but also a DMR (Double Magneto Resistance) element, a GMR (Giant Magneto Resistive effect) element, an AMR (Anisotropic Magneto Resistive) element, or the like is used as long as it is a magnetoresistive effect element. You may do so.
  • the TMR element 170 is also attached to the circuit board of the detection unit 300 .
  • an arithmetic processing section mounted on the circuit board 180 of the detection unit 300 is driven based on the number of pulses per unit time. The number of rotations or rotational speed (rpm) of the side flange 120 can be determined.
  • the phase of the A-phase signal or the B-phase signal output from the TMR element 170 advances in accordance with the rotational direction of the driven flange 120. , or will be late. Therefore, the arithmetic processing unit of the circuit board 180 can also determine the rotation direction of the driven side flange 120 based on the phases of the A phase and the B phase output from the TMR element 170 .
  • the Hall element 162 and the TMR element 170 are arranged in parallel at positions on the circuit board 180 facing the magnet 161 of the driven side flange 120 and the multipolar magnetic ring 140, respectively.
  • This detection unit 300 serves as a magnetic field detection device for a torque measuring device.
  • the Hall element 162 of the Hall sensor 160 and the TMR element 170 that detects the magnetic field of the multipolar magnetic ring 140 are provided in parallel at positions close to each other. Therefore, in the detection unit 300, compared with the case where the Hall element 162 and the TMR element 170 are provided at positions far apart from each other, it is possible to contribute to space saving and downsizing.
  • both the Hall element 162 and the TMR element 170 are mounted on the circuit board 180 of the detection unit 300 at close positions.
  • the Hall element 162 and the TMR element 170 are arranged at a constant distance along the axis X direction so as not to exert too much influence.
  • the Hall element 162 of the Hall sensor 160 detects the magnetic field in the radial direction of the magnet 161 embedded in the hole 124 of the peripheral side surface 120 a of the driven flange 120 .
  • the TMR element 170 detects the magnetic field in the axial direction in the multipolar magnetic ring 140 . In other words, the Hall element 162 and the TMR element 170 have different magnetic field detection directions.
  • the strength of the magnetic field corresponding to the A phase and B phase is, for example, 2.0 mT (millitesla).
  • the strength of the magnetic field corresponding to the Z phase when only the magnetic field of the magnet 161 of the Hall sensor 160 is detected by the Hall element 162 is 1.5 mT.
  • the Hall element 162 has the strength of the magnetic field of the magnet 161 (1.5 mT) and the strength of the magnetic field of the multipolar magnetic ring 140 (2.0 mT). will detect a applied 3.5 mT magnetic field.
  • the Hall element 162 is configured to output a Z-phase signal when the intensity of the detected magnetic field exceeds 3.0 mT set as a threshold. That is, even if the Hall element 162 is affected by the magnetic field of the multipolar magnetic ring 140 when detecting the magnetic field of the magnet 161, the Hall element 162 detects the magnetic field from the multipolar magnetic ring 140 when the magnetic field of the magnet 161 is not detected. Since a magnetic field of 2.0 mT or more is never detected, the threshold value of 3.0 mT is not exceeded and the Z-phase signal is never output.
  • the peak of the magnetic field of the S pole of the magnet 161 and the peak of the magnetic field of the S pole of the multipolar magnetic ring 140 coincide with each other.
  • the timing when 170 detects only the magnetic field of multipolar magnetic ring 140 it is not affected by the magnetic field of magnet 161, so it outputs only the A-phase and B-phase signals.
  • the TMR element 170 that detects the magnetic field of the multipolar magnetic ring 140 outputs Based on the A-phase and B-phase signals, the rotation speed and rotation direction of the driven flange 120 can be accurately calculated.
  • the Hall element 162 can reliably detect the Z-phase signal.
  • the strong magnetic field of the magnet 161 may adversely affect the magnetic field of the multipolar magnetic ring 140, causing the TMR element 170 to malfunction. Therefore, in the torque measuring device 100, it is necessary to set the magnetic field of the magnet 161 of the hall sensor 160 so as not to be too strong.
  • the Hall element 162 detects the strength of the magnetic field of the magnet 161 (0.5 mT) and the strength of the magnetic field of the multipolar magnetic ring 140 (2.0 mT) superimposed.
  • the magnetic field strength is 2.5 mT and does not exceed the threshold value of 3.0 mT.
  • the Hall element 162 detects the strength of the magnetic field of the multipolar magnetic ring 140 even when the magnetic field of the magnet 161 is not detected. (2.0 mT), the Z-phase signal may be output.
  • an appropriate Along with setting the strength and distance of the magnetic field, it is important to set a threshold at which the Hall element 162 does not malfunction.
  • the torque measuring device 100 since the torque measuring device 100 has the configuration in which the driven side flange 120 and the multipolar magnetic ring 140 are integrally attached, compared to the case where the multipolar magnetic ring 140 is provided separately from the driven side flange 120, It can be made smaller and more compact.
  • the torque measuring device 100 includes a Hall element 162 arranged to face a magnet 161 attached to a hole 124 of a peripheral side surface 120a of a driven flange 120, and a TMR element 170 arranged to face a multipolar magnetic ring 140. It is provided in parallel with the circuit board 180 of the detection unit 300 . Therefore, the torque measuring device 100 can be made small and compact as a whole without increasing the size of the detection unit 300 as well.
  • the Hall element 162 and the TMR element 170 are arranged on the circuit board 180 at positions close to each other. detects the magnetic field of the magnet 161 .
  • the maximum magnetic field strength of the magnet 161 is 1.5 mT and the maximum magnetic field strength of the multipolar magnetic ring 140 is 2.0 mT.
  • the total is 3.5 mT, which is the sum of the magnetic force vectors according to the principle of superposition.
  • the Hall element 162 is set to 3.0 mT as a threshold for reliably outputting the Z-phase signal without error when 3.5 mT is detected as a reference for outputting the Z-phase signal, in anticipation of safety. .
  • the Hall element 162 can output a Z-phase signal only when the magnetic field of the multipolar magnetic ring 140 and the magnetic field of the magnet 161 are detected at the same time.
  • the arithmetic processing circuit provided on the circuit board 180 of the detection unit 300 can also calculate the rotational position of the driven side flange 120 based on the Z-phase signal.
  • the arithmetic processing circuit provided on the circuit board 180 of the detection unit 300 can also accurately determine the rotation speed and rotation direction of the driven side flange 120 .
  • the torque measuring device 100 that is much smaller than the conventional one, and the rotational position of the driven side flange 120 as well as the rotational speed and rotational direction of the driven side flange 120 can be obtained. be able to.
  • the torque measuring device of the present invention is not limited to the configurations of the above embodiments.
  • those skilled in the art can appropriately modify the torque measuring device of the present invention according to conventionally known knowledge. As long as the configuration of the present invention is still provided even with such modification, it is, of course, included in the scope of the present invention.
  • SYMBOLS 100... Torque measuring apparatus 110... Drive side flange 120... Driven side flange 130... Strain-generating body 140... Multipolar magnetic ring 150... Fixed base 160... Hall sensor 161... Magnet 162... Hall element, 170...TMR element, 180...circuit board, 300...detection unit.

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Abstract

Provided is a torque measurement device which can be made more compact than the prior art.　A torque measurement device (100) according to the present invention comprises: a driving-side flange (110); a driven-side flange (120); a strain-inducing body (130) integrally provided between the driving-side flange (110) and the driven-side flange (120); a magnet (161) provided to a prescribed location on the peripheral side surface on the outer peripheral side of the driven-side flange (120); an annular multipole magnetic ring (140) integrally attached to a disk-shaped end surface of the driven-side flange (120); and a detection device (300) including a first detection element (162) that detects a first magnetic field generated by the magnet (161) during rotation of the driven-side flange (120), and a second detection element (170) that detects a second magnetic field generated during rotation of the multipole magnetic ring (140) rotating together with the driven-side flange (120). The first detection element (162) outputs a signal expressing that the driven-side flange (120) has rotated one time when the sum of the first magnetic field and the second magnetic field has exceeded a prescribed threshold value.

Description

トルク測定装置、トルク測定装置用の磁界発生装置、および、トルク測定装置用の磁界検出装置Torque measuring device, magnetic field generator for torque measuring device, and magnetic field detecting device for torque measuring device
　本発明は、トルク測定装置、トルク測定装置用の磁界発生装置、および、トルク測定装置用の磁界検出装置に関する。 The present invention relates to a torque measuring device, a magnetic field generating device for a torque measuring device, and a magnetic field detecting device for a torque measuring device.
　従来、トルク測定装置においては、回転体と負荷との間の回転軸に設けられ、回転体と負荷との間の回転トルクを非接触によって測定するものである。例えば、自動車のエンジンの動力を車輪に伝達する役目を持っているドライブシャフトにおいて、その軸トルクを測定する軸トルク測定装置が提案されている（例えば、特許文献１参照。）。 Conventionally, a torque measuring device is provided on the rotating shaft between the rotating body and the load, and measures the rotational torque between the rotating body and the load in a non-contact manner. For example, there has been proposed a shaft torque measuring device for measuring the shaft torque of a drive shaft that transmits the power of an automobile engine to wheels (see, for example, Patent Document 1).
　この軸トルク測定装置においては、リング状の磁気エンコーダの周囲に対向するように配置されたホール素子等の２つの磁気センサによって検出するＡ相、Ｂ相の信号により回転方向を判別し、Ａ相およびＢ相の双方の信号の差分からドライブシャフトのねじれの方向およびねじれ量を測定し、そのねじれ量から軸トルクを算出している。 In this shaft torque measuring device, the direction of rotation is determined by signals of the A phase and the B phase detected by two magnetic sensors such as Hall elements arranged so as to face each other around a ring-shaped magnetic encoder. The direction and amount of twist of the drive shaft are measured from the difference between the signals of both phases B and B, and the shaft torque is calculated from the amount of twist.
特開平１０－３３９６７７号公報JP-A-10-339677
　しかしながら、特許文献１の軸トルク測定装置においては、Ａ相、Ｂ相の信号から回転速度や回転角度を検出するために、角センサターゲットとセンサ側ユニットとからなる回転検出機を２つ用いる構成である。このような軸トルク測定装置においては、回転検出機を２つ用いる構成であるため全体として大型化し易く、従来から更に小型化したいという要望があった。 However, in the shaft torque measuring device of Patent Document 1, in order to detect the rotation speed and rotation angle from the A-phase and B-phase signals, two rotation detectors each having an angle sensor target and a sensor-side unit are used. is. In such an axial torque measuring device, since it is configured to use two rotation detectors, it tends to be large as a whole, and there has been a demand for further miniaturization.
　本発明は、以上の背景に鑑みてなされたものであり、従来に比して一段と小型化し得るトルク測定装置を提供することを目的とする。 The present invention has been made in view of the above background, and an object of the present invention is to provide a torque measuring device that can be made even more compact than before.
　上記課題は、以下の本発明により解決される。即ち、本発明のトルク測定装置は、駆動側フランジと、従動側フランジと、前記駆動側フランジと前記従動側フランジとの間であって、前記駆動側フランジおよび前記従動側フランジの双方と同一の軸線上において一体に設けられ、ひずみゲージが取り付けられた起歪体と、前記従動側フランジにおける外周側の周側面の所定位置に設けられた磁石と、前記従動側フランジにおける円盤状の端面に一体に取り付けられた環状の多極磁気リングと、前記従動側フランジの回転中に前記磁石が発生する第１磁界を検出する第１検出素子と、前記従動側フランジと共に回転する前記多極磁気リングの回転中に当該多極磁気リングが発生する第２磁界を検出する第２検出素子とを備える検出装置とを備え、前記第１検出素子は、前記第１磁界と、前記第２磁界との合計が所定の閾値を超えた場合に前記従動側フランジが１回転したことを表す信号を出力する。 The above problems are solved by the present invention below. That is, the torque measuring device of the present invention provides a driving side flange, a driven side flange, and between the driving side flange and the driven side flange, the same torque as both the driving side flange and the driven side flange. A strain body provided integrally on the axis and having a strain gauge attached thereto, a magnet provided at a predetermined position on the peripheral side of the driven side flange on the outer peripheral side, and a disk-shaped end surface of the driven side flange integrally. a first sensing element for sensing a first magnetic field generated by said magnet during rotation of said driven flange; and said multipolar magnetic ring rotating with said driven flange. and a second sensing element for sensing a second magnetic field generated by said multi-pole magnetic ring during rotation, said first sensing element being the sum of said first magnetic field and said second magnetic field. exceeds a predetermined threshold value, a signal indicating that the driven flange has made one rotation is output.
　本発明のトルク測定装置用の磁界発生装置は、駆動側フランジと、従動側フランジと、前記駆動側フランジと前記従動側フランジとの間であって、前記駆動側フランジおよび前記従動側フランジの双方と同一の軸線上において一体に設けられた起歪体と、検出装置と対向して配置され、前記従動側フランジにおける外周側の周側面の所定位置に設けられて磁界を発生する磁石と、前記従動側フランジにおける円盤状の端面に一体に取り付けられて磁界を発生する環状の多極磁気リングと、を備える。 The magnetic field generating device for the torque measuring device of the present invention includes: a driving side flange, a driven side flange, and between the driving side flange and the driven side flange, both the driving side flange and the driven side flange a strain-generating body integrally provided on the same axis as the magnet, a magnet arranged opposite to the detection device and provided at a predetermined position on the peripheral side surface of the driven side flange on the outer peripheral side to generate a magnetic field; an annular multi-pole magnetic ring integrally attached to the disk-shaped end surface of the driven flange for generating a magnetic field.
　本発明のトルク測定装置用の磁界検出装置は、従動側フランジの回転中に磁石が発生する磁界を検出する第１検出素子と、前記従動側フランジと共に回転する多極磁気リングの回転中に当該多極磁気リングが発生する磁界を検出する第２検出素子とを備え、前記第１検出素子は、前記磁石が発生する磁界と、前記多極磁気リングが発生する磁界との合計が所定の閾値を超えた場合に前記従動側フランジが１回転したことを表す信号を出力する。 A magnetic field detection device for a torque measuring device according to the present invention comprises a first detection element for detecting a magnetic field generated by a magnet during rotation of a driven flange, and and a second detection element for detecting a magnetic field generated by the multipolar magnetic ring, wherein the sum of the magnetic field generated by the magnet and the magnetic field generated by the multipolar magnetic ring is a predetermined threshold. is exceeded, a signal indicating that the driven-side flange has made one rotation is output.
本発明の一実施の形態にかかるトルク測定装置の全体構成を示す斜視図である。1 is a perspective view showing the overall configuration of a torque measuring device according to one embodiment of the present invention; FIG. 本発明の一実施の形態にかかるトルク測定装置におけるホールセンサの磁石、ホール素子、ＴＭＲ素子および多極磁気リングの配置を示す略線的正面図である。FIG. 4 is a schematic front view showing the arrangement of magnets of Hall sensors, Hall elements, TMR elements, and multipolar magnetic rings in the torque measuring device according to one embodiment of the present invention; 本発明の一実施の形態にかかるトルク測定装置に用いられる多極磁気リングの構成を示す略線図である。1 is a schematic diagram showing the configuration of a multipolar magnetic ring used in a torque measuring device according to an embodiment of the invention; FIG. 本発明の一実施の形態にかかるトルク測定装置によって検出されるＡ相、Ｂ相およびＺ相のパルスを示すパルス波形図である。4 is a pulse waveform diagram showing A-phase, B-phase and Z-phase pulses detected by the torque measuring device according to the embodiment of the present invention; FIG. 本発明の一実施の形態にかかるトルク測定装置の多極磁気リングの発する磁界の強さ（Ａ）、ホールセンサの磁石の発する磁界の強さ（Ｂ）、および、多極磁気リングとホールセンサの磁石の発する磁界の強さの合計と閾値との関係をそれぞれ示す波形図である。Magnetic field strength (A) emitted by the multipolar magnetic ring of the torque measuring device according to one embodiment of the present invention, magnetic field strength (B) emitted by the magnet of the Hall sensor, and the multipolar magnetic ring and the Hall sensor 3 is a waveform diagram showing the relationship between the total strength of the magnetic fields emitted by the magnets and the threshold.
　＜実施の形態＞
　続いて、本発明の実施の形態について図面を参照しながら説明する。図１は、本発明の一実施の形態にかかるトルク測定装置の全体構成を示す斜視図である。図２は、本発明の一実施の形態にかかるトルク測定装置におけるホールセンサの磁石、ホール素子、ＴＭＲ素子および多極磁気リングの配置を示す略線的正面図である。図３は、本発明の一実施の形態にかかるトルク測定装置に用いられる多極磁気リングの構成を示す略線図である。図４は、本発明の一実施の形態にかかるトルク測定装置によって検出されるＡ相、Ｂ相およびＺ相のパルスを示すパルス波形図である。図５は、本発明の一実施の形態にかかるトルク測定装置の多極磁気リングの発する磁界の強さ（Ａ）、ホールセンサの磁石の発する磁界の強さ（Ｂ）、および、多極磁気リングとホールセンサの磁石の発する磁界の強さの合計と閾値との関係をそれぞれ示す波形図である。 <Embodiment>
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a torque measuring device according to one embodiment of the invention. FIG. 2 is a schematic front view showing the arrangement of magnets of Hall sensors, Hall elements, TMR elements, and multipolar magnetic rings in a torque measuring device according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing the configuration of a multipolar magnetic ring used in the torque measuring device according to one embodiment of the present invention; FIG. 4 is a pulse waveform diagram showing A-phase, B-phase and Z-phase pulses detected by the torque measuring device according to the embodiment of the present invention. FIG. 5 shows the strength (A) of the magnetic field emitted by the multipolar magnetic ring of the torque measuring device according to one embodiment of the present invention, the strength (B) of the magnetic field emitted by the magnet of the Hall sensor, and the multipolar magnetic FIG. 4 is a waveform chart showing the relationship between the total strength of the magnetic field emitted by the magnets of the ring and the Hall sensor and the threshold.
　なお、本実施の形態の説明において、以下の説明では、便宜上、トルク測定装置１００の軸線Ｘが延びる方向を回転軸Ｘ方向または軸線Ｘ方向とする。また、以下の説明では、便宜上、回転軸Ｘ方向において矢印ａ方向を駆動側または左側、矢印ｂ方向を従動側または右側とする。軸線Ｘに垂直な径方向において、軸線Ｘから遠ざかる矢印ｃ方向を外周側とし、軸線Ｘに近づく矢印ｄ方向を内周側とする。さらに、トルク測定装置１００において上側（矢印ｅ方向）および下側（矢印ｆ方向）は、図面上におけるトルク測定装置１００の重力方向における上下関係を意味する。 In the description of the present embodiment, for the sake of convenience, the direction in which the axis X of the torque measuring device 100 extends will be referred to as the rotation axis X direction or the axis X direction. In the following description, for the sake of convenience, the direction of arrow a in the direction of the rotation axis X is the drive side or left side, and the direction of arrow b is the driven side or right side. In the radial direction perpendicular to the axis X, the direction of arrow c moving away from the axis X is defined as the outer peripheral side, and the direction of arrow d approaching the axis X is defined as the inner peripheral side. Furthermore, the upper side (the direction of arrow e) and the lower side (the direction of arrow f) in the torque measuring device 100 mean the vertical relationship of the torque measuring device 100 in the gravitational direction on the drawing.
　図１および図２に示すように、トルク測定装置１００は、駆動側フランジ１１０と、従動側フランジ１２０と、駆動側フランジ１１０と従動側フランジ１２０との間に所定の肉厚および所定の外径を有する中空円筒状の起歪体１３０とを有している。ただし、図１においては、駆動側フランジ１１０と従動側フランジ１２０との間に起歪体１３０が隠れている状態である。 As shown in FIGS. 1 and 2, the torque measuring device 100 includes a driving side flange 110, a driven side flange 120, and a predetermined wall thickness and a predetermined outer diameter between the driving side flange 110 and the driven side flange 120. and a hollow cylindrical strain body 130 having a However, in FIG. 1 , the strain body 130 is hidden between the driving side flange 110 and the driven side flange 120 .
　駆動側フランジ１１０は、円盤状の部材である。駆動側フランジ１１０は、当該駆動側フランジ１１０を貫通した状態で同心円上に等間隔で複数個のネジ穴１１２が設けられている。 The drive-side flange 110 is a disk-shaped member. The drive-side flange 110 is provided with a plurality of screw holes 112 at equal intervals on a concentric circle in a state of penetrating the drive-side flange 110 .
　駆動側フランジ１１０において、当該駆動側フランジ１１０の図中左側（矢印ａ方向）の端面１１０ｓには、例えば自動車の車輪によって回転させられるシャーシダイナモの測定ローラとダイナモメータ、ブレーキ機構等に連結される駆動側連結部材（図示せず）が複数個のネジ穴１１２を介して連結される。 In the drive-side flange 110, an end surface 110s on the left side (arrow a direction) of the drive-side flange 110 in the figure is connected to a measuring roller, a dynamometer, a brake mechanism, etc. of a chassis dynamo rotated by the wheels of an automobile, for example. A drive-side connecting member (not shown) is connected through a plurality of screw holes 112 .
　また、駆動側フランジ１１０は、固定台１５０に設けられた環状の半割構造からなるカバー体１５２によって当該駆動側フランジ１１０の周側面が覆われている。なお、カバー体１５２は、駆動側フランジ１１０の端面１１０ｓを覆っておらず、露出させている。カバー体１５２は、固定台１５０に対して図示しないネジ等によって固定されている。 In addition, the drive-side flange 110 has its peripheral side surface covered by a cover body 152 having an annular half-split structure provided on the fixed base 150 . Note that the cover body 152 does not cover the end surface 110s of the drive-side flange 110, but exposes it. The cover body 152 is fixed to the fixed base 150 by screws (not shown) or the like.
　従動側フランジ１２０は、駆動側フランジ１１０と同一外径を有する円盤状の部材である。駆動側フランジ１１０および従動側フランジ１２０は、両者の間に設けられた起歪体１３０を介して一体に形成されている。すなわち駆動側フランジ１１０、起歪体１３０、および、従動側フランジ１２０は、軸線Ｘを中心として一体化されている。なお、従動側フランジ１２０は、駆動側フランジ１１０とは異なり、カバー体１５２に覆われてはおらず、固定台１５０の上側（矢印ｅ方向）において全て露出された状態にある。 The driven side flange 120 is a disc-shaped member having the same outer diameter as the driving side flange 110 . The drive-side flange 110 and the driven-side flange 120 are integrally formed via a strain-generating body 130 provided therebetween. That is, the driving side flange 110, the strain generating body 130, and the driven side flange 120 are integrated with the axis X as the center. Unlike the driving side flange 110, the driven side flange 120 is not covered with the cover body 152 and is entirely exposed above the fixed base 150 (in the direction of arrow e).
　従動側フランジ１２０においても、当該従動側フランジ１２０を貫通した状態で同心円上に等間隔で複数個のネジ穴１２２が設けられている。従動側フランジ１２０は、負荷部材（図示せず）に対して複数個のネジ穴１２２を介して結合されている。 Also in the driven side flange 120, a plurality of screw holes 122 are provided at equal intervals on a concentric circle while passing through the driven side flange 120. A driven flange 120 is coupled to a load member (not shown) through a plurality of threaded holes 122 .
　従動側フランジ１２０は、周方向の側面（以下、これを「周側面」という。）１２０ａに対して一定の間隔毎に複数個の有底の穴（以下、これを単に「穴」という。）１２４が形成されている。従動側フランジ１２０における複数個の穴１２４の内部には、図示しない光センサを構成する発光ダイオード等の発光素子（図示せず）がそれぞれ埋め込まれている。 The driven-side flange 120 has a plurality of bottomed holes (hereinafter simply referred to as "holes") at regular intervals with respect to a circumferential side surface (hereinafter referred to as "peripheral side surface") 120a. 124 are formed. Light-emitting elements (not shown) such as light-emitting diodes constituting optical sensors (not shown) are embedded in the plurality of holes 124 in the driven side flange 120 .
　光センサの発光素子が埋め込まれた穴１２４を有する従動側フランジ１２０の周側面１２０ａと対向する固定台１５０の所定の位置には、磁界検出装置としての検出ユニット３００が取り付けられている。 A detection unit 300 as a magnetic field detection device is attached at a predetermined position of the fixed base 150 facing the peripheral side surface 120a of the driven side flange 120 having the hole 124 in which the light emitting element of the optical sensor is embedded.
　検出ユニット３００においては、上述した光センサの発光素子から出力された光を受光するフォトダイオード等の受光素子が設けられている。この光センサは、起歪体１３０に取り付けられた後述する歪ゲージによって検出された信号を従動側フランジ１２０の発光素子および検出ユニット３００の受光素子間で非接触により伝送する。 The detection unit 300 is provided with a light-receiving element such as a photodiode that receives light output from the light-emitting element of the optical sensor described above. This optical sensor transmits a signal detected by a later-described strain gauge attached to the strain-generating body 130 between the light-emitting element of the driven-side flange 120 and the light-receiving element of the detection unit 300 without contact.
　従動側フランジ１２０における周側面１２０ａに設けられた複数個の穴１２４の何れか一つには、ホールセンサ１６０を構成する磁石１６１が上述した光センサの発光素子（図示せず）と共に埋め込まれている。すなわち、従動側フランジ１２０の複数個の穴１２４の何れか一つは、発光素子およびホールセンサ１６０の磁石１６１の双方に共有されている。 A magnet 161 constituting a hall sensor 160 is embedded in one of the plurality of holes 124 provided in the peripheral side surface 120a of the driven side flange 120 together with the light emitting element (not shown) of the optical sensor described above. there is That is, any one of the plurality of holes 124 of the driven side flange 120 is shared by both the light emitting element and the magnet 161 of the hall sensor 160 .
　ホールセンサ１６０の磁石１６１は、後述するホール素子１６２によって当該従動側フランジ１２０が１回転（１周）したときにＺ相の信号として出力するための機械的な原点となる位置に設けられている。これは、トルク測定装置１００において、従動側フランジ１２０に連結された負荷部材として例えばシャフト等の回転軸（図示せず）における回転中の位置を検出するためである。 The magnet 161 of the Hall sensor 160 is provided at a mechanical origin for outputting a Z-phase signal when the driven-side flange 120 makes one rotation (one round) by a Hall element 162, which will be described later. . This is for detecting the rotating position of a rotating shaft (not shown) such as a shaft as a load member connected to the driven side flange 120 in the torque measuring device 100 .
　このホールセンサ１６０は、従動側フランジ１２０に設けられた磁石１６１および検出ユニット３００に設けられたホール素子１６２によって非接触に構成されている。ホールセンサ１６０は、ホール効果を利用して、磁石１６１が発する第１磁界や電流が発する第１磁界を第１検出素子としてのホール素子１６２により電気信号に変換して出力する磁気センサである。 This Hall sensor 160 is configured in a non-contact manner by a magnet 161 provided on the driven side flange 120 and a Hall element 162 provided on the detection unit 300 . The Hall sensor 160 is a magnetic sensor that uses the Hall effect to convert a first magnetic field generated by a magnet 161 or a first magnetic field generated by a current into an electric signal by a Hall element 162 as a first detection element and outputs the electric signal.
　また、従動側フランジ１２０においては、複数個のネジ穴１２２が形成されている右側（矢印ｂ方向）の端面１２０ｂに対して当該従動側フランジ１２０とほぼ同一外径を有する環状の多極磁気リング１４０が一体に取り付けられている。 In the driven side flange 120, an annular multipolar magnetic ring having substantially the same outer diameter as the driven side flange 120 with respect to the end face 120b on the right side (in the direction of the arrow b) in which a plurality of screw holes 122 are formed. 140 are integrally attached.
　すなわち、従動側フランジ１２０と多極磁気リング１４０とは一体化された状態であるため、多極磁気リング１４０は、駆動側フランジ１１０および従動側フランジ１２０と同時に回転される。なお、多極磁気リング１４０の外径は、従動側フランジ１２０の外径よりも大きくても小さくてもよい。 That is, since the driven side flange 120 and the multipolar magnetic ring 140 are integrated, the multipolar magnetic ring 140 rotates simultaneously with the driving side flange 110 and the driven side flange 120 . Note that the outer diameter of the multipolar magnetic ring 140 may be larger or smaller than the outer diameter of the driven side flange 120 .
　多極磁気リング１４０は、薄板かつ円環状のリング部材からなり、一体に取り付けられた従動側フランジ１２０に対して高速回転時に負荷とならないよう軽量化されたプラスチック製の磁気リングである。 The multipolar magnetic ring 140 is a thin plate and annular ring member, and is a plastic magnetic ring that is lightened so as not to load the integrally attached driven side flange 120 during high-speed rotation.
　図３に示すように、多極磁気リング１４０は、その端面１４０ｓに周方向に沿って１組のＳ極およびＮ極が等間隔で複数着磁された合計１６極（組）からなるアキシャルタイプの磁気リングである。なお、多極磁気リング１４０は、１６極に限る必要はなく、８極、２４極、または、それ以上の極数であってもよく、要求される回転分解能に合わせた極数を設定すればよい。 As shown in FIG. 3, the multipolar magnetic ring 140 is an axial type consisting of a total of 16 poles (groups) in which a plurality of pairs of S poles and N poles are magnetized at equal intervals along the circumferential direction along the end face 140s. is a magnetic ring. The multipolar magnetic ring 140 need not be limited to 16 poles, and may have 8 poles, 24 poles, or more. good.
　起歪体１３０は、駆動側フランジ１１０および従動側フランジ１２０の間に位置し、両者と一体に形成された中空円筒状の部材である。起歪体１３０の内周面には、複数のひずみゲージ（図示せず）が貼着されている。複数のひずみゲージはホイーストンブリッジ回路を形成するように結線される。 The strain-generating body 130 is a hollow cylindrical member located between the drive-side flange 110 and the driven-side flange 120 and integrally formed therewith. A plurality of strain gauges (not shown) are attached to the inner peripheral surface of the strain generating body 130 . A plurality of strain gauges are connected to form a Wheatstone bridge circuit.
　因みに、トルク測定装置１００においては、駆動側フランジ１１０、従動側フランジ１２０、および、これらの間に形成された起歪体１３０がトルク量を測定する際に必要な電力を外部から受け取る必要がある。そのためトルク測定装置１００においては例えばロータリートランス形式により外部から非接触で電力伝送が行われる。 Incidentally, in the torque measuring device 100, it is necessary for the driving side flange 110, the driven side flange 120, and the strain generating body 130 formed therebetween to receive electric power from the outside when measuring the amount of torque. . Therefore, in the torque measuring device 100, electric power is transmitted from the outside in a non-contact manner, for example, in a rotary transformer format.
　ところでトルク測定装置１００においては、検出ユニット３００が従動側フランジ１２０の周側面１２０ａと対向するように配置されている。検出ユニット３００においては、従動側フランジ１２０の周側面１２０ａの穴１２４に埋め込まれたホールセンサ１６０の磁石１６１と対向する位置にホール素子１６２が取り付けられている。実際上、光センサの受光素子やホールセンサ１６０のホール素子１６２は、検出ユニット３００の回路基板１８０に対して取り付けられている。 By the way, in the torque measuring device 100 , the detection unit 300 is arranged so as to face the peripheral side surface 120 a of the driven side flange 120 . In the detection unit 300 , a Hall element 162 is attached at a position facing the magnet 161 of the Hall sensor 160 embedded in the hole 124 of the peripheral side surface 120 a of the driven side flange 120 . In practice, the light receiving element of the optical sensor and the Hall element 162 of the Hall sensor 160 are attached to the circuit board 180 of the detection unit 300 .
　さらに検出ユニット３００には、多極磁気リング１４０の磁場（第２磁界）を検出し、Ａ相の信号およびＢ相の信号を出力する第２検出素子としてのＴＭＲ(Tunneling Magneto Resistance)素子１７０についても多極磁気リング１４０と対向する回路基板１８０の位置に取り付けられている。 Further, the detection unit 300 includes a TMR (Tunneling Magneto Resistance) element 170 as a second detection element that detects the magnetic field (second magnetic field) of the multipolar magnetic ring 140 and outputs an A-phase signal and a B-phase signal. is mounted on the circuit board 180 at a position facing the multi-pole magnetic ring 140 .
　ＴＭＲ素子１７０は、トンネル磁気抵抗効果を利用したトンネル磁気抵抗効果素子である。実際、多極磁気リング１４０が従動側フランジ１２０と共に回転すると、その回転に応じてＴＭＲ素子１７０に作用する磁界の向きが回転し、互いに位相がずれたＡ相の信号およびＢ相の信号を出力する。 The TMR element 170 is a tunnel magnetoresistive element that utilizes the tunnel magnetoresistive effect. In fact, when the multipolar magnetic ring 140 rotates together with the driven side flange 120, the direction of the magnetic field acting on the TMR element 170 rotates according to the rotation, and the A-phase signal and the B-phase signal which are out of phase with each other are output. do.
　実際、図４に示すように、ＴＭＲ素子１７０が出力するＡ相の信号に対してＢ相の信号は位相が９０度ずれている。例えば、従動側フランジ１２０が時計回り方向へ回転するとＡ相の信号がＢ相の信号よりも位相が９０度進んだ状態で出力され、従動側フランジ１２０が反時計回り方向へ回転するとＡ相の信号がＢ相の信号よりも位相が９０度遅れた状態で出力される。 In fact, as shown in FIG. 4, the B-phase signal is out of phase with the A-phase signal output from the TMR element 170 by 90 degrees. For example, when the driven-side flange 120 rotates clockwise, the A-phase signal is output with a phase lead of the B-phase signal by 90 degrees, and when the driven-side flange 120 rotates counterclockwise, the A-phase signal is output. The signal is output with a phase delay of 90 degrees from the B-phase signal.
　ところで、ホールセンサ１６０のホール素子１６２は、従動側フランジ１２０が回転したときに磁石１６１と対向した場合に当該磁石１６１の磁界を検出し、Ｚ相の信号を従動側フランジ１２０の１回転（１周）につき１回出力する。 By the way, the Hall element 162 of the Hall sensor 160 detects the magnetic field of the magnet 161 when it faces the magnet 161 when the driven-side flange 120 rotates, and outputs a Z-phase signal to the driven-side flange 120 one rotation (1 output once per cycle).
　なお、従動側フランジ１２０の周側面１２０ａの穴１２４に埋め込まれた磁石１６１と、多極磁気リング１４０の位置（極性）とを合わせておく必要がある。例えば、磁石１６１におけるＳ極の磁界のピークと、多極磁気リング１４０のＳ極の磁界のピークとが一致するように従動側フランジ１２０と多極磁気リング１４０とが一体に取り付けられている。 The position (polarity) of the magnet 161 embedded in the hole 124 of the peripheral side surface 120a of the driven side flange 120 and the multipolar magnetic ring 140 must be aligned. For example, the driven side flange 120 and the multipolar magnetic ring 140 are integrally attached so that the magnetic field peak of the south pole of the magnet 161 and the magnetic field peak of the south pole of the multipolar magnetic ring 140 are aligned.
　具体的には、多極磁気リング１４０のうち、従動側フランジ１２０と向かい合う側の端面１４０ｓ（図２）の任意の位置には、左側（矢印ａ方向）に突出した円柱状の突出した凸部１４２（図３）が形成されている。また、従動側フランジ１２０のうち、多極磁気リング１４０と向かい合う側の端面１２０ｂには、上述した凸部１４２と嵌合される円柱状の穴である凹部１２３が形成されている。 Specifically, in the multipolar magnetic ring 140, an end surface 140s (FIG. 2) facing the driven side flange 120 has a columnar protrusion protruding leftward (in the direction of arrow a) at an arbitrary position. 142 (FIG. 3) are formed. Further, in the driven-side flange 120, an end face 120b on the side facing the multipolar magnetic ring 140 is formed with a recess 123 which is a cylindrical hole into which the protrusion 142 described above is fitted.
　したがって、多極磁気リング１４０の凸部１４２と、従動側フランジ１２０の凹部１２３とが嵌合された状態においては、ホール素子１６２の磁石１６１におけるＳ極の磁界のピークと、多極磁気リング１４０のＳ極の磁界のピークとが一致するように予め設定されている。例えば、図２に示すように、従動側フランジ１２０の軸線Ｘ方向において、ホール素子１６２の磁石１６１と多極磁気リング１４０のＳ極とは互いに隣接するように配置されている。なお、トルク測定装置１００においては、従動側フランジ１２０、磁石１６１、多極磁気リング１４０によってトルク測定装置用の磁界発生装置が構成されている。 Therefore, when the protrusion 142 of the multipolar magnetic ring 140 and the recess 123 of the driven side flange 120 are fitted together, the S pole magnetic field peak of the magnet 161 of the Hall element 162 and the multipolar magnetic ring 140 is set in advance so that the peak of the magnetic field of the S pole of . For example, as shown in FIG. 2, the magnet 161 of the Hall element 162 and the S pole of the multipolar magnetic ring 140 are arranged adjacent to each other in the X-axis direction of the driven flange 120 . In the torque measuring device 100, the driven side flange 120, the magnet 161, and the multipolar magnetic ring 140 constitute a magnetic field generating device for the torque measuring device.
　なお、検出ユニット３００においては、ＴＭＲ素子１７０に限らず、磁気抵抗効果素子であれば、ＤＭＲ(Double Magneto Resistance)素子、ＧＭＲ(Giant Magneto Resistive effect)素子、ＡＭＲ(Anisotropic Magneto Resistive)素子等を用いるようにしてもよい。因みに、ＴＭＲ素子１７０についても検出ユニット３００の回路基板に取り付けられている。 In addition, in the detection unit 300, not only the TMR element 170 but also a DMR (Double Magneto Resistance) element, a GMR (Giant Magneto Resistive effect) element, an AMR (Anisotropic Magneto Resistive) element, or the like is used as long as it is a magnetoresistive effect element. You may do so. Incidentally, the TMR element 170 is also attached to the circuit board of the detection unit 300 .
　図３に示すように、ＴＭＲ素子１７０は、多極磁気リング１４０の１６極のうち、１組のＳ極からＮ極までの角度（この場合、２２．５度（３６０÷１６＝２２．５））に対して２５６パルス出力可能な素子である。 As shown in FIG. 3, the TMR element 170 has an angle from one set of south poles to north poles (in this case, 22.5 degrees (360÷16=22.5 )) can output 256 pulses.
　このため、図４に示すように、従動側フランジ１２０（多極磁気リング１４０）が１回転（１周）すると、ホール素子１６２からＺ相の信号が１パルス出力されるのに対し、ＴＭＲ素子１７０からはＡ相およびＢ相の信号として４０９６（２５６×１６）パルスが出力される。 Therefore, as shown in FIG. 4, when the driven-side flange 120 (multipolar magnetic ring 140) makes one rotation (one round), one pulse of the Z-phase signal is output from the Hall element 162, whereas one pulse is output from the TMR element. 170 outputs 4096 (256×16) pulses as A-phase and B-phase signals.
　ＴＭＲ素子１７０は、従動側フランジ１２０の１回転につき４０９６パルスを出力するので、検出ユニット３００の回路基板１８０に搭載された演算処理部（図示せず）は単位時間当たりのパルス数に基づいて従動側フランジ１２０の回転数すなわち回転速度（ｒｐｍ）を求めることができる。 Since the TMR element 170 outputs 4096 pulses per rotation of the driven side flange 120, an arithmetic processing section (not shown) mounted on the circuit board 180 of the detection unit 300 is driven based on the number of pulses per unit time. The number of rotations or rotational speed (rpm) of the side flange 120 can be determined.
　また、図４に示すように、ＴＭＲ素子１７０から出力されるＡ相の信号またはＢ相の信号は、従動側フランジ１２０の回転方向に応じてＡ相の信号またはＢ相の信号の位相が進み、または、遅れることになる。このため回路基板１８０の演算処理部では、ＴＭＲ素子１７０から出力されるＡ相およびＢ相の位相に基づいて従動側フランジ１２０の回転方向についても判別することができる。 Further, as shown in FIG. 4, the phase of the A-phase signal or the B-phase signal output from the TMR element 170 advances in accordance with the rotational direction of the driven flange 120. , or will be late. Therefore, the arithmetic processing unit of the circuit board 180 can also determine the rotation direction of the driven side flange 120 based on the phases of the A phase and the B phase output from the TMR element 170 .
　検出ユニット３００においては、従動側フランジ１２０の磁石１６１および多極磁気リング１４０とそれぞれ対向する回路基板１８０の位置にホール素子１６２およびＴＭＲ素子１７０が並列した状態で配置されている。この検出ユニット３００は、トルク測定装置用の磁界検出装置となる。 In the detection unit 300, the Hall element 162 and the TMR element 170 are arranged in parallel at positions on the circuit board 180 facing the magnet 161 of the driven side flange 120 and the multipolar magnetic ring 140, respectively. This detection unit 300 serves as a magnetic field detection device for a torque measuring device.
　すなわち検出ユニット３００では、ホールセンサ１６０のホール素子１６２および多極磁気リング１４０の磁界を検出するＴＭＲ素子１７０が互いに近接した位置に並列した状態で設けられている。このため検出ユニット３００では、ホール素子１６２およびＴＭＲ素子１７０が互いに遠くに離れた位置に設けられた場合に比べて省スペース化に寄与し、小型化を図ることができる。 That is, in the detection unit 300, the Hall element 162 of the Hall sensor 160 and the TMR element 170 that detects the magnetic field of the multipolar magnetic ring 140 are provided in parallel at positions close to each other. Therefore, in the detection unit 300, compared with the case where the Hall element 162 and the TMR element 170 are provided at positions far apart from each other, it is possible to contribute to space saving and downsizing.
　ところでトルク測定装置１００においては、検出ユニット３００の回路基板１８０上にホール素子１６２およびＴＭＲ素子１７０の双方を近接した位置に取り付けているが、磁石１６１の磁場および多極磁気リング１４０の磁場が互いに大きく影響し過ぎることのないようホール素子１６２およびＴＭＲ素子１７０が軸線Ｘ方向に沿って一定の距離を保って配置されている。 By the way, in the torque measuring device 100, both the Hall element 162 and the TMR element 170 are mounted on the circuit board 180 of the detection unit 300 at close positions. The Hall element 162 and the TMR element 170 are arranged at a constant distance along the axis X direction so as not to exert too much influence.
　ホールセンサ１６０のホール素子１６２は、従動側フランジ１２０の周側面１２０ａの穴１２４に埋め込まれた磁石１６１におけるラジアル方向の磁場を検出する。これに対してＴＭＲ素子１７０は、多極磁気リング１４０におけるアキシャル方向の磁場を検出する。すなわちホール素子１６２およびＴＭＲ素子１７０は、磁場を検出する方向がお互いに異なっている。 The Hall element 162 of the Hall sensor 160 detects the magnetic field in the radial direction of the magnet 161 embedded in the hole 124 of the peripheral side surface 120 a of the driven flange 120 . On the other hand, the TMR element 170 detects the magnetic field in the axial direction in the multipolar magnetic ring 140 . In other words, the Hall element 162 and the TMR element 170 have different magnetic field detection directions.
　図５（Ａ）に示すように、多極磁気リング１４０の磁界をＴＭＲ素子１７０によって検出したときのＡ相およびＢ相に対応する磁界の強さは例えば２．０ｍＴ（ミリテスラ）である。一方、図５（Ｂ）に示すように、ホールセンサ１６０の磁石１６１の磁界だけをホール素子１６２によって検出したときのＺ相に対応する磁界の強さは、１．５ｍＴである。 As shown in FIG. 5A, when the magnetic field of the multipolar magnetic ring 140 is detected by the TMR element 170, the strength of the magnetic field corresponding to the A phase and B phase is, for example, 2.0 mT (millitesla). On the other hand, as shown in FIG. 5B, the strength of the magnetic field corresponding to the Z phase when only the magnetic field of the magnet 161 of the Hall sensor 160 is detected by the Hall element 162 is 1.5 mT.
　上述したように、従動側フランジ１２０の軸線Ｘ方向において、周側面１２０ａの穴１２４に取り付けられた磁石１６１におけるＳ極の磁界のピークと、多極磁気リング１４０のＳ極の磁界のピークとが一致するように予め設定されている。このため、図５（Ｃ）に示すように、ホール素子１６２は、磁石１６１の磁界の強さ（１．５ｍＴ）と、多極磁気リング１４０の磁界の強さ（２．０ｍＴ）とが重畳された３．５ｍＴの磁界を検出することになる。 As described above, in the axis X direction of the driven side flange 120, the peak of the magnetic field of the S pole of the magnet 161 attached to the hole 124 of the peripheral side surface 120a and the peak of the magnetic field of the S pole of the multipolar magnetic ring 140 are preset to match. Therefore, as shown in FIG. 5(C), the Hall element 162 has the strength of the magnetic field of the magnet 161 (1.5 mT) and the strength of the magnetic field of the multipolar magnetic ring 140 (2.0 mT). will detect a applied 3.5 mT magnetic field.
　ここで、ホール素子１６２は、検出した磁界の強さが閾値として設定された３．０ｍＴを超えた場合にＺ相の信号を出力するように構成されている。つまり、ホール素子１６２は、磁石１６１の磁界を検出する際、多極磁気リング１４０の磁界の影響を受けたとしても、磁石１６１の磁界を検出していないときは、多極磁気リング１４０からの２．０ｍＴ以上の磁界を検出することはないので、閾値３．０ｍＴを超えることがなくＺ相信号を出力してしまうことはない。 Here, the Hall element 162 is configured to output a Z-phase signal when the intensity of the detected magnetic field exceeds 3.0 mT set as a threshold. That is, even if the Hall element 162 is affected by the magnetic field of the multipolar magnetic ring 140 when detecting the magnetic field of the magnet 161, the Hall element 162 detects the magnetic field from the multipolar magnetic ring 140 when the magnetic field of the magnet 161 is not detected. Since a magnetic field of 2.0 mT or more is never detected, the threshold value of 3.0 mT is not exceeded and the Z-phase signal is never output.
　また、上述したように、従動側フランジ１２０の軸線Ｘ方向において、磁石１６１におけるＳ極の磁界のピークと、多極磁気リング１４０のＳ極の磁界のピークとが一致しているが、ＴＭＲ素子１７０が多極磁気リング１４０の磁界だけを検出するタイミングでは、磁石１６１の磁界の影響を受けていないのでＡ相およびＢ相の信号だけを出力することになる。 Further, as described above, in the X direction of the axis line of the driven side flange 120, the peak of the magnetic field of the S pole of the magnet 161 and the peak of the magnetic field of the S pole of the multipolar magnetic ring 140 coincide with each other. At the timing when 170 detects only the magnetic field of multipolar magnetic ring 140, it is not affected by the magnetic field of magnet 161, so it outputs only the A-phase and B-phase signals.
　この場合、検出ユニット３００の回路基板１８０の演算処理部では、ホールセンサ１６０の磁石１６１による磁界の影響を受けることはないので、多極磁気リング１４０の磁界を検出するＴＭＲ素子１７０から出力されるＡ相およびＢ相の信号に基づいて従動側フランジ１２０の回転速度や回転方向について正確に算出することができる。 In this case, since the arithmetic processing section of the circuit board 180 of the detection unit 300 is not affected by the magnetic field of the magnet 161 of the Hall sensor 160, the TMR element 170 that detects the magnetic field of the multipolar magnetic ring 140 outputs Based on the A-phase and B-phase signals, the rotation speed and rotation direction of the driven flange 120 can be accurately calculated.
　仮に、多極磁気リング１４０の磁界の強さを無視できる程度にホールセンサ１６０の磁石１６１の磁界が３．０ｍＴよりも非常に強く大きい値を持つ場合、その磁石１６１の強い磁界に合わせて閾値を高く設定すれば、ホール素子１６２はＺ相の信号を確実に検出することができる。 If the magnetic field of the magnet 161 of the Hall sensor 160 has a value much higher than 3.0 mT such that the magnetic field strength of the multipolar magnetic ring 140 can be ignored, then the threshold is set high, the Hall element 162 can reliably detect the Z-phase signal.
　しかしながら、磁石１６１の強い磁界が多極磁気リング１４０の磁界に悪影響を及ぼしてＴＭＲ素子１７０が誤動作してしまう恐れが生じる。したがって、トルク測定装置１００においては、ホールセンサ１６０の磁石１６１の磁界を強過ぎることのないように設定する必要がある。 However, the strong magnetic field of the magnet 161 may adversely affect the magnetic field of the multipolar magnetic ring 140, causing the TMR element 170 to malfunction. Therefore, in the torque measuring device 100, it is necessary to set the magnetic field of the magnet 161 of the hall sensor 160 so as not to be too strong.
　また、ホールセンサ１６０の磁石１６１の磁界が１．５ｍＴよりも非常に弱い場合、例えば多極磁気リング１４０の磁界の強さである２．０ｍＴよりも低い例えば０．５ｍＴの場合について考える。この場合、ホール素子１６２は、磁石１６１の磁界の強さ（０．５ｍＴ）と、多極磁気リング１４０の磁界の強さ（２．０ｍＴ）とが重畳されて検出してしまうが、合計の磁界の強さが２．５ｍＴであり、閾値である３．０ｍＴを超えなくなる。そのために、閾値を３．０ｍＴから２．０ｍＴに近い値まで下げた場合、ホール素子１６２は、磁石１６１の磁界を検出していないときであっても、多極磁気リング１４０の磁界の強さ（２．０ｍＴ）に基づいてＺ相の信号を出力してしまうことにもなりかねない。 Also, consider the case where the magnetic field of the magnet 161 of the Hall sensor 160 is much weaker than 1.5 mT, for example 0.5 mT, which is lower than the magnetic field strength of the multipolar magnetic ring 140 of 2.0 mT. In this case, the Hall element 162 detects the strength of the magnetic field of the magnet 161 (0.5 mT) and the strength of the magnetic field of the multipolar magnetic ring 140 (2.0 mT) superimposed. The magnetic field strength is 2.5 mT and does not exceed the threshold value of 3.0 mT. Therefore, when the threshold value is lowered from 3.0 mT to a value close to 2.0 mT, the Hall element 162 detects the strength of the magnetic field of the multipolar magnetic ring 140 even when the magnetic field of the magnet 161 is not detected. (2.0 mT), the Z-phase signal may be output.
　すなわち、ホールセンサ１６０の磁石１６１の磁界の強さ、多極磁気リング１４０の磁界の強さ、検出ユニット３００におけるホール素子１６２とＴＭＲ素子１７０との間の距離等のパラメータに基づいて、適切な磁界の強さおよび距離を設定すると共に、ホール素子１６２が誤動作しない閾値を設定することが重要になる。 That is, based on parameters such as the strength of the magnetic field of the magnet 161 of the Hall sensor 160, the strength of the magnetic field of the multipolar magnetic ring 140, and the distance between the Hall element 162 and the TMR element 170 in the detection unit 300, an appropriate Along with setting the strength and distance of the magnetic field, it is important to set a threshold at which the Hall element 162 does not malfunction.
＜作用および効果＞
　以上の構成において、トルク測定装置１００では、従動側フランジ１２０および多極磁気リング１４０を一体に取り付けた構成であるため、従動側フランジ１２０と別体に多極磁気リング１４０を設ける場合に比べて小型化およびコンパクト化することができる。 <Action and effect>
In the above configuration, since the torque measuring device 100 has the configuration in which the driven side flange 120 and the multipolar magnetic ring 140 are integrally attached, compared to the case where the multipolar magnetic ring 140 is provided separately from the driven side flange 120, It can be made smaller and more compact.
　また、トルク測定装置１００は、従動側フランジ１２０の周側面１２０ａの穴１２４に取り付けられた磁石１６１と対向配置されたホール素子１６２、および、多極磁気リング１４０と対向配置されたＴＭＲ素子１７０が検出ユニット３００の回路基板１８０に並列した状態で設けられている。このため、検出ユニット３００としても大型化することなく、トルク測定装置１００を全体的に小型コンパクト化することができる。 Further, the torque measuring device 100 includes a Hall element 162 arranged to face a magnet 161 attached to a hole 124 of a peripheral side surface 120a of a driven flange 120, and a TMR element 170 arranged to face a multipolar magnetic ring 140. It is provided in parallel with the circuit board 180 of the detection unit 300 . Therefore, the torque measuring device 100 can be made small and compact as a whole without increasing the size of the detection unit 300 as well.
　検出ユニット３００では、回路基板１８０上にホール素子１６２およびＴＭＲ素子１７０が互いに近接した位置に配置されているため、ホール素子１６２が多極磁気リング１４０の磁界を検出してしまうと共に、ＴＭＲ素子１７０が磁石１６１の磁界を検出してしまう。 In the detection unit 300, the Hall element 162 and the TMR element 170 are arranged on the circuit board 180 at positions close to each other. detects the magnetic field of the magnet 161 .
　しかしながら、検出ユニット３００のホール素子１６２は、磁石１６１の磁界の強さが最大１．５ｍＴであり、多極磁気リング１４０の磁界の強さの最大が２．０ｍＴであるため、両者の磁界の合計は重ね合わせの原理により磁力ベクトルの総和である３．５ｍＴとなる。またホール素子１６２はＺ相の信号を出力する基準として、３．５ｍＴを検出したときに誤りなく確実にＺ相の信号を出力するための閾値として安全を見越した３．０ｍＴと設定している。 However, in the Hall element 162 of the detection unit 300, the maximum magnetic field strength of the magnet 161 is 1.5 mT and the maximum magnetic field strength of the multipolar magnetic ring 140 is 2.0 mT. The total is 3.5 mT, which is the sum of the magnetic force vectors according to the principle of superposition. In addition, the Hall element 162 is set to 3.0 mT as a threshold for reliably outputting the Z-phase signal without error when 3.5 mT is detected as a reference for outputting the Z-phase signal, in anticipation of safety. .
　これにより、ホール素子１６２は、多極磁気リング１４０の磁界を検出すると同時に磁石１６１の磁界を検出したときに限り、Ｚ相の信号を出力することができる。かくして、検出ユニット３００の回路基板１８０に設けられた演算処理回路では、Ｚ相の信号に基づいて従動側フランジ１２０の回転位置についても算出することができる。 Thus, the Hall element 162 can output a Z-phase signal only when the magnetic field of the multipolar magnetic ring 140 and the magnetic field of the magnet 161 are detected at the same time. Thus, the arithmetic processing circuit provided on the circuit board 180 of the detection unit 300 can also calculate the rotational position of the driven side flange 120 based on the Z-phase signal.
　また、検出ユニット３００のＴＭＲ素子１７０は、従動側フランジ１２０の磁石１６１が１個だけしか取り付けられていないため、多極磁気リング１４０の磁界を検出する際、磁石１６１の磁界を検出しない部分ではＡ相およびＢ相の信号を出力することができる。これにより、検出ユニット３００の回路基板１８０に設けられた演算処理回路では、従動側フランジ１２０の回転速度および回転方向についても正確に求めることができる。 In addition, since only one magnet 161 of the driven side flange 120 is attached to the TMR element 170 of the detection unit 300, when detecting the magnetic field of the multipolar magnetic ring 140, the magnetic field of the magnet 161 is not detected. A-phase and B-phase signals can be output. As a result, the arithmetic processing circuit provided on the circuit board 180 of the detection unit 300 can also accurately determine the rotation speed and rotation direction of the driven side flange 120 .
　以上の構成によれば、従来に比して一段と小型化したトルク測定装置１００を提供することができると共に、従動側フランジ１２０の回転速度および回転方向と共に、従動側フランジ１２０の回転位置についても求めることができる。 According to the above configuration, it is possible to provide the torque measuring device 100 that is much smaller than the conventional one, and the rotational position of the driven side flange 120 as well as the rotational speed and rotational direction of the driven side flange 120 can be obtained. be able to.
＜他の実施の形態＞
　なお、本実施の形態のトルク測定装置１００においては、アキシャルタイプの多極磁気リング１４０を用いるようにした場合について述べたが、本発明はこれに限らず、ラジアルタイプの多極磁気リングを用いるようにしてもよい。 <Other embodiments>
In the torque measuring device 100 of the present embodiment, the case where the axial type multipolar magnetic ring 140 is used has been described, but the present invention is not limited to this, and a radial type multipolar magnetic ring is used. You may do so.
　以上、本発明のトルク測定装置について、好ましい実施の形態を挙げて説明したが、本発明のトルク測定装置は上記実施の形態の構成に限定されるものではない。その他、当業者は、従来公知の知見に従い、本発明のトルク測定装置を適宜改変することができる。かかる改変によってもなお本発明の構成を具備する限り、勿論、本発明の範疇に含まれるものである。 Although the preferred embodiments of the torque measuring device of the present invention have been described above, the torque measuring device of the present invention is not limited to the configurations of the above embodiments. In addition, those skilled in the art can appropriately modify the torque measuring device of the present invention according to conventionally known knowledge. As long as the configuration of the present invention is still provided even with such modification, it is, of course, included in the scope of the present invention.
　１００…トルク測定装置、１１０…駆動側フランジ、１２０…従動側フランジ、１３０…起歪体、１４０…多極磁気リング、１５０…固定台、１６０…ホールセンサ、１６１…磁石、１６２…ホール素子、１７０…ＴＭＲ素子、１８０…回路基板、３００…検出ユニット。 DESCRIPTION OF SYMBOLS 100... Torque measuring apparatus 110... Drive side flange 120... Driven side flange 130... Strain-generating body 140... Multipolar magnetic ring 150... Fixed base 160... Hall sensor 161... Magnet 162... Hall element, 170...TMR element, 180...circuit board, 300...detection unit.

Claims (8)

  1. 　駆動側フランジと、
    　従動側フランジと、
    　前記駆動側フランジと前記従動側フランジとの間であって、前記駆動側フランジおよび前記従動側フランジの双方と同一の軸線上において一体に設けられ、ひずみゲージが取り付けられた起歪体と、
    　前記従動側フランジにおける外周側の周側面の所定位置に設けられた磁石と、
    　前記従動側フランジにおける円盤状の端面に一体に取り付けられた環状の多極磁気リングと、
    　前記従動側フランジの回転中に前記磁石が発生する第１磁界を検出する第１検出素子と、前記従動側フランジと共に回転する前記多極磁気リングの回転中に当該多極磁気リングが発生する第２磁界を検出する第２検出素子とを備える検出装置と
    　を備え、
    　前記第１検出素子は、前記第１磁界と、前記第２磁界との合計が所定の閾値を超えた場合に前記従動側フランジが１回転したことを表す信号を出力する
    　トルク測定装置。     a drive side flange;
    a driven flange;
    a strain body provided between the driving side flange and the driven side flange integrally on the same axis as both the driving side flange and the driven side flange and having a strain gauge attached thereto;
    a magnet provided at a predetermined position on the peripheral side surface of the driven side flange on the outer peripheral side;
    an annular multipolar magnetic ring integrally attached to the disk-shaped end surface of the driven flange;
    a first detection element for detecting a first magnetic field generated by the magnet during rotation of the driven flange; a detection device comprising a second detection element that detects two magnetic fields,
    The torque measuring device, wherein the first detection element outputs a signal indicating that the driven flange has made one rotation when the sum of the first magnetic field and the second magnetic field exceeds a predetermined threshold.
  2. 　前記第１検出素子は前記磁石と対向するように配置され、前記第２検出素子は前記多極磁気リングと対向するように配置されている
    　請求項１に記載のトルク測定装置。     The torque measuring device according to claim 1, wherein the first sensing element is arranged to face the magnet, and the second sensing element is arranged to face the multipolar magnetic ring.
  3. 　前記第１検出素子および前記第２検出素子は、前記検出装置において前記軸線に沿って並列した状態で配置されている
    　請求項２に記載のトルク測定装置。     The torque measurement device according to claim 2, wherein the first detection element and the second detection element are arranged in parallel along the axis in the detection device.
  4. 　前記第１磁界のピークと、前記第２磁界のピークとが一致するように前記従動側フランジと前記多極磁気リングとが一体に取り付けられている
    　請求項１に記載のトルク測定装置。     2. The torque measuring device according to claim 1, wherein the driven side flange and the multipolar magnetic ring are integrally attached so that the peak of the first magnetic field and the peak of the second magnetic field are aligned.
  5. 　前記多極磁気リングが前記従動側フランジに取り付けられる端面には、位置決め用の凸部が形成され、
    　前記従動側フランジが前記多極磁気リングに取り付けられる端面には、前記凸部と係合される凹部が形成されている
    　請求項４に記載のトルク測定装置。     A positioning protrusion is formed on the end face where the multipolar magnetic ring is attached to the driven side flange,
    5. The torque measuring device according to claim 4, wherein the end face where the driven side flange is attached to the multipolar magnetic ring is formed with a concave portion that engages with the convex portion.
  6. 　前記第１検出素子は、ホール素子であり、
    　前記第２検出素子は、ＴＭＲ素子である
    　請求項１乃至５のいずれか一項に記載のトルク測定装置。     The first detection element is a Hall element,
    The torque measuring device according to any one of claims 1 to 5, wherein the second detection element is a TMR element.
  7. 　駆動側フランジと、
    　従動側フランジと、
    　前記駆動側フランジと前記従動側フランジとの間であって、前記駆動側フランジおよび前記従動側フランジの双方と同一の軸線上において一体に設けられた起歪体と、
    　検出装置と対向して配置され、前記従動側フランジにおける外周側の周側面の所定位置に設けられて磁界を発生する磁石と、
    　前記従動側フランジにおける円盤状の端面に一体に取り付けられて磁界を発生する環状の多極磁気リングと、
    　を備えるトルク測定装置用の磁界発生装置。     a drive side flange;
    a driven flange;
    a strain-generating body integrally provided between the drive-side flange and the driven-side flange on the same axis as both the drive-side flange and the driven-side flange;
    a magnet that is disposed facing the detection device and that is provided at a predetermined position on the peripheral side surface of the driven flange on the outer peripheral side to generate a magnetic field;
    an annular multipolar magnetic ring that is integrally attached to the disk-shaped end surface of the driven flange and generates a magnetic field;
    A magnetic field generator for a torque measuring device comprising:
  8. 　従動側フランジの回転中に磁石が発生する磁界を検出する第１検出素子と、
    　前記従動側フランジと共に回転する多極磁気リングの回転中に当該多極磁気リングが発生する磁界を検出する第２検出素子と
    　を備え、
    　前記第１検出素子は、前記磁石が発生する磁界と、前記多極磁気リングが発生する磁界との合計が所定の閾値を超えた場合に前記従動側フランジが１回転したことを表す信号を出力する
    　トルク測定装置用の磁界検出装置。     a first detection element that detects a magnetic field generated by the magnet during rotation of the driven flange;
    a second detection element for detecting a magnetic field generated by the multi-pole magnetic ring during rotation of the multi-pole magnetic ring rotating together with the driven flange;
    The first detection element outputs a signal indicating that the driven flange has made one rotation when the sum of the magnetic field generated by the magnet and the magnetic field generated by the multipolar magnetic ring exceeds a predetermined threshold. Magnetic field detection device for torque measuring device.
PCT/JP2022/017711 2021-07-12 2022-04-13 Torque measurement device, magnetic field generation device for torque measurement device, and magnetic field detection device for torque measurement device WO2023286406A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11230838A (en) * 1998-02-17 1999-08-27 Shinko Zoki Kk Torque meter
US20040015307A1 (en) * 2000-08-22 2004-01-22 David Heisenberg Method for a phase angle correction during scanning of a code track
JP2009097895A (en) * 2007-10-15 2009-05-07 Ntn Corp Measuring device and measurement method of shaft torque in drive shaft
JP2018185198A (en) * 2017-04-25 2018-11-22 日本精工株式会社 Angle detector, relative angle detector, torque sensor, electric power steering device, and vehicle
JP2021021586A (en) * 2019-07-25 2021-02-18 ユニパルス株式会社 Torque converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11230838A (en) * 1998-02-17 1999-08-27 Shinko Zoki Kk Torque meter
US20040015307A1 (en) * 2000-08-22 2004-01-22 David Heisenberg Method for a phase angle correction during scanning of a code track
JP2009097895A (en) * 2007-10-15 2009-05-07 Ntn Corp Measuring device and measurement method of shaft torque in drive shaft
JP2018185198A (en) * 2017-04-25 2018-11-22 日本精工株式会社 Angle detector, relative angle detector, torque sensor, electric power steering device, and vehicle
JP2021021586A (en) * 2019-07-25 2021-02-18 ユニパルス株式会社 Torque converter

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