WO2020261903A1 - 回転角度検出装置 - Google Patents

回転角度検出装置 Download PDF

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Publication number
WO2020261903A1
WO2020261903A1 PCT/JP2020/021874 JP2020021874W WO2020261903A1 WO 2020261903 A1 WO2020261903 A1 WO 2020261903A1 JP 2020021874 W JP2020021874 W JP 2020021874W WO 2020261903 A1 WO2020261903 A1 WO 2020261903A1
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WO
WIPO (PCT)
Prior art keywords
rotation angle
magnetic field
shaft
metal member
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/021874
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
仁美 本多
河野　禎之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
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 Denso Corp filed Critical Denso Corp
Priority to DE112020003112.8T priority Critical patent/DE112020003112T5/de
Priority to CN202080046378.9A priority patent/CN114026382B/zh
Publication of WO2020261903A1 publication Critical patent/WO2020261903A1/ja
Priority to US17/559,432 priority patent/US11874109B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/107—Safety-related aspects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/105—Details of the valve housing having a throttle position sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1065—Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
    • 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
    • G01D5/14—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 the magnitude of a current or voltage
    • G01D5/142—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 the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—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 the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • 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
    • G01D5/14—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 the magnitude of a current or voltage
    • G01D5/16—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 the magnitude of a current or voltage by varying resistance

Definitions

  • This disclosure relates to a rotation angle detection device.
  • Japanese Unexamined Patent Publication No. 2014-151634 discloses a rotation angle detection device that detects the rotation angle of a valve gear driven by an electric actuator.
  • This rotation angle detection device includes a magnetic circuit unit that rotates together with a valve gear, and a magnetic detection element such as a Hall element that detects a change in magnetic flux due to the rotation of the magnetic circuit unit.
  • a magnetic detection element such as a Hall element that detects a change in magnetic flux due to the rotation of the magnetic circuit unit.
  • the magnetic flux circuit unit is also rotated, and the angle between the magnetic flux formed by the magnetic flux circuit unit and the magnetic detector element changes.
  • the magnetic detector can detect the change in the rotation angle as the change in the magnetic field strength.
  • the magnetic detection element may be affected by a change in an external magnetic field, and in that case, there is a concern that the detection accuracy of the rotation angle of the valve gear may decrease.
  • the rotation angle is caused by the magnetic field generated by such an external device. The detection accuracy of the detector can be affected.
  • a rotation angle detecting device for detecting the rotation angle of the valve body.
  • This rotation angle detector has a shaft connecting the valve body, a gear connected to the shaft and rotating the valve body by rotation of the shaft, and a magnetic field generating unit arranged on the gear side to generate a magnetic field.
  • a magnetic fixing metal member for fixing the gear to the shaft which is provided at a position covering at least a part of the magnetic field generating portion, and an extension of the shaft to rotate the gear. It includes a magnetic detection element that detects the magnetic flux density of the magnetic field that rotates with it.
  • the fixing metal member is a magnetic material, at least a part of the magnetic field from the outside can be shielded.
  • the fixing metal member shields at least a part of the disturbance magnetic field. Therefore, the influence of the disturbance magnetic field on the magnetic detection element can be suppressed, and the deterioration of the detection accuracy can be suppressed.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of an electronically controlled throttle including a rotation angle detecting device.
  • FIG. 2 is an explanatory diagram showing a schematic configuration of an electronically controlled throttle including a rotation angle detecting device.
  • FIG. 3 is an explanatory view showing the configuration of the gear.
  • FIG. 4 is an explanatory diagram showing the configuration of the magnetic circuit.
  • FIG. 5 is an explanatory view showing a metal member for fixing.
  • FIG. 6 is a graph showing the magnitude of the influence of the disturbance of the comparative example and the present embodiment.
  • FIG. 7 is an explanatory view showing another metal member for fixing.
  • FIG. 8 is an explanatory view showing another metal member for fixing.
  • FIG. 9 is an explanatory view showing another metal member for fixing.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of an electronically controlled throttle including a rotation angle detecting device.
  • FIG. 2 is an explanatory diagram showing a schematic configuration of an electronically controlled throttle including a rotation angle detecting
  • FIG. 10 is an explanatory view showing another metal member for fixing.
  • FIG. 11 is an explanatory view showing another metal member for fixing.
  • FIG. 12 is an explanatory view showing another metal member for fixing.
  • FIG. 13 is a graph showing an output error when the fixing metal member shown in FIG. 12 is used.
  • FIG. 14 is an explanatory view showing caulking fixation.
  • FIG. 15 is an explanatory diagram showing the configuration of the magnetic circuit of the second embodiment.
  • FIG. 16 is an explanatory diagram showing an example of the shape of the magnet.
  • 1 and 2 show an electronically controlled throttle 10 provided with a rotation angle detecting device for detecting the rotation angle of the valve body 16.
  • the electronically controlled throttle 10 controls the amount of intake air to the engine of the vehicle by rotating the valve body 16 provided in the intake passage 17.
  • the electronically controlled throttle 10 includes a motor 11, gears 12, 13, 14 and a shaft 15, a valve body 16, an intake passage 17, a housing 18, a housing cover 19, a spring 20, and a magnetic field generator 21.
  • a magnetic detector 24 and a fixing metal member 25 are provided.
  • An intake passage 17 is provided inside the housing 18.
  • the intake passage 17 is provided with a valve body 16 for controlling the flow of air in the intake passage 17.
  • the valve body 16 is, for example, a butterfly valve and is rotatably supported by a shaft 15.
  • the shaft 15 is made of metal, and a resin gear 14 is fixed to one end of the shaft 15.
  • the shaft 15 and the gear 14 are fixed to each other by using a magnetic fixing metal member 25 that is insert-molded into the gear 14.
  • the gear 14 is connected to the motor 11 via the gears 13 and 12.
  • the motor 11 is controlled by an ECU (not shown) that controls the operation of the engine (not shown).
  • the spring 20 is a torsion spring, and generates a force for urging the valve body 16 in the direction of opening or closing the valve body 16.
  • the spring 20 may be a spring of another form such as a coil spring, and either a coil spring that urges the valve body 16 in the valve closing direction or a coil spring that urges the valve body 16 in the valve opening direction. It may be provided as a configuration.
  • the ECU detects how much the valve body 16 is rotated and opened by using the magnetic field generating unit 21 and the magnetic detection element 24.
  • a magnetic field generating portion 21 for generating a magnetic field is integrally formed on the gear 14.
  • a magnetic detector 24 is arranged on the housing cover 19. The magnetic detector 24 is arranged inside the magnetic field generating unit 21 so as to be located on an extension of the shaft 15, and has a predetermined detection direction among the magnetic fields generated by the magnetic field generating unit 21. The magnetic flux density of the magnetic field is detected.
  • the magnetic detector 24 is preferably arranged at the center of rotation of the gear 14.
  • the magnetic detection element 24 is composed of, for example, a Hall element. An MR element may be used instead of the Hall element.
  • the magnetic detection element 24 may be configured to detect the magnetic flux density in two directions.
  • the two magnetic detector elements may be arranged so that the detection directions of the magnetic flux densities of the two magnetic detector elements intersect.
  • the two magnetic detector elements may be housed in one package or may be housed in separate packages.
  • the fixing metal member 25 is integrally formed with the gear 14, and fixes the shaft 15 and the gear. Further, the fixing metal member 25 is formed of a magnetic material such as a cold-rolled steel plate (SPCC), and shields the magnetic field from the outside so that the magnetic field from the outside does not affect the magnetic field generating portion 21. To do.
  • SPCC cold-rolled steel plate
  • the fixing metal member 25 may be formed of a soft magnetic material such as a silicon steel plate or a ferrite core, in addition to a ferromagnetic material such as a cold-rolled steel plate. Forming the fixing metal member 25 with a cold-rolled steel plate has the effects that the material is easily available, the workability of the punching press is good, and the cost can be reduced.
  • the gear 14 rotates around the center of rotation O.
  • a fixing metal member 25 for fixing the shaft 15 is integrally formed around the rotation center O.
  • the magnetic field generating portion 21 is arranged so as to overlap the outer circumference of the fixing metal member 25.
  • the magnetic field generating portion 21 does not have to overlap with the outer circumference of the fixing metal member 25 when the gear 14 is viewed from the axial direction of the rotation center O.
  • the magnetic field generating portion 21 is also integrally molded with the gear 14.
  • the magnetic field generating unit 21 includes a pair of magnets 22 and a pair of yokes 23.
  • the xyz direction is defined in preparation for the description of the shape and arrangement direction of each part of the magnetic field generating portion 21 and the shape and arrangement direction of the fixing metal member 25 described later.
  • the arrangement direction of the pair of magnets 22 is the x direction
  • the direction in which the pair of yokes 23 face each other is the y direction
  • the direction perpendicular to the x and y directions is the z direction.
  • the y direction coincides with the direction By of the magnetic field lines at the center of the magnetic field generating unit 21.
  • the z direction coincides with the direction along the axial direction of the shaft 15.
  • Each yoke 23 has a substantially arcuate shape, and by sandwiching the magnet 22 between the ends of the two yokes 23 arranged to face each other, the magnetic field generating portion 21 has a pair of magnets 22 and a pair of yokes. It has a substantially cylindrical shape consisting of 23. At this time, the north poles of the two magnets are in contact with each end of one yoke 23, and the south poles of the two magnets are in contact with each end of the other yoke 23. Therefore, as shown by the broken line in FIG. 4, the lines of magnetic force due to the two magnets 22 pass through the inside of each yoke 23, and head toward the center of the opposing yokes at the center of each yoke 23 in the arc direction.
  • the lines of magnetic force generated by the pair of magnets are plane-symmetric with the yz plane passing through the shaft 15 as the plane of symmetry.
  • the x-direction and the y-direction are defined by the magnetic field generating unit 21.
  • the upper part of FIG. 4 shows a case where the direction By of the magnetic field lines from one yoke 23 to the other yoke 23 coincides with the direction of detection by the magnetic detector 24 (maximum sensitivity direction) as a reference position.
  • the lower part of FIG. 4 shows the case where the magnetic field generating unit 21 is rotated. When the magnetic field generating unit 21 rotates, it also rotates in the x-direction and the y-direction, as shown in the lower part of FIG.
  • the magnetic field formed by the magnetic field generating unit 21 is a closed magnetic field, it can be less affected by an external magnetic field. Further, since the leakage of the magnetic field can be reduced, the physique of the magnet 22 required to obtain the magnetic field of the same strength can be reduced.
  • the magnetic field generating portion 21 is integrally molded with the gear 14, when the gear 14 rotates, the magnetic field generating portion 21 also rotates, and the direction of the magnetic field lines also rotates.
  • the magnetic detector 24 is provided on the housing cover 19 and does not rotate. Therefore, when the magnetic field generating unit 21 rotates with the rotation of the gear 14, the direction By of the magnetic field line formed by the magnetic field generating unit 21 near the center does not match the direction of detection by the magnetic detection element 24, and the magnetic detection element 24, the detected value changes. Therefore, the ECU can know the change in the direction of the magnetic field lines from the change in the detection value of the magnetic detection element 24, and can know the rotation angle of the gear 14 and the rotation angle of the valve body 16.
  • the fixing metal member 25 is arranged so as to overlap the magnetic field generating portion 21 described above so as to overlap in the z direction.
  • the arrangement of the magnetic field generating portion 21 and the fixing metal member 25 and the shape and function of the fixing metal member 25 will be described in detail below.
  • the fixing metal member 25 made of a magnetic material has a substantially circular shape whose outer edge substantially overlaps with the magnet 22 and the yoke 23 of the magnetic field generating portion 21 when viewed from the z direction. Therefore, it works to shield it from external magnetic fields.
  • the magnetic field lines generated by such an external device are magnetic. It is possible to suppress the influence of the detected value through the detection element 24. As a result, as shown in FIG. 6, even if an external magnetic field (hereinafter, also referred to as a disturbance magnetic field) invades, the influence on the detection value by the magnetic detection element 24 can be suppressed, so that the rotation angle of the valve body 16 can be detected. Deterioration of accuracy can be suppressed.
  • an external magnetic field hereinafter, also referred to as a disturbance magnetic field
  • the metal member 25 for fixing does not have to have a size such that the outer edge substantially overlaps with the magnet 22 and the yoke 23 of the magnetic field generating portion 21 when viewed from the z direction.
  • the presence of the magnetic fixing metal member 25 can shield the disturbance magnetic field passing through the magnetic detection element 24.
  • the fixing metal member 25 Since the fixing metal member 25 is made of a magnetic material, it forms a magnetic circuit together with the magnet 22 and the yoke 23 and is magnetized. Therefore, even if the spring 20 or the like is worn and abrasion powder is generated on the metal, for example, It can be attracted by the fixing metal member 25. As a result, the abrasion powder can be prevented from being adsorbed on the magnet 22, and the influence on the magnetic detector 24 can be suppressed in this respect as well.
  • the fixing metal member 25 has an opening 25o at the center of rotation O when viewed from the z direction, and a shaft 15 is inserted into the opening 25o.
  • the fixing metal member 25 and the shaft 15 are fixed by caulking.
  • the opening 25o is formed with a fitting portion 27 that is in contact with the shaft 15 toward the center of rotation O.
  • the fitting portion 27 has a shape that repeats six concave-convex shapes in the circumferential direction on the xy plane, and one of the concave portions has a shape different from the others. Therefore, the fitting portion 27 has an asymmetrical shape when the entire shape is viewed from the z direction.
  • the fixing metal member 25 is formed by, for example, pressing.
  • burrs 25b may be formed on the cut surface.
  • the punching direction is known and the forming direction of the burr 25b is known when the press is punched to form the fixing metal member 25. If the forming direction of the burr 25b is known, the orientation of the burr 25b can be aligned when the fixing metal member 25 is placed on the mold for molding the gear 14 and integrally molded with resin, and the burr 25b and the mold interfere with each other. It is possible to suppress the influence on the dimensional accuracy between the gear 14 and the fixing metal member 25.
  • the influence of the disturbance magnetic field is smaller than that of the comparative example in which the fixing metal member has the same shape as the present embodiment and is formed of a non-magnetic material. There is.
  • the fixing metal member 25A shown in FIG. 7 has a shape in which the position where it overlaps with the magnet 22 is cut out as compared with the fixing metal member 25 shown in FIG.
  • the fixing metal member 25A has a shape provided with a plurality of protrusions 26A protruding so as to overlap the yoke 23 of the magnetic field generating portion 21. Since the gear 14 is insert-molded in a state where the fixing metal member 25A is embedded, the presence of the two protrusions 26A causes the transmission of the rotational force from the shaft 15 to the gear 14 via the fixing metal member 25A. , Can be done more reliably. The same applies when stopping the rotation. Since the anchor effect is generated by the protrusion 26A, it is easy to suppress the occurrence of a situation in which only the gear 14 rotates even if a large rotational load is applied to the gear 14. This effect can be achieved in any embodiment including the protrusions 26A to 26E shown in FIGS. 7 to 11.
  • the two protrusions 26A have a plane-symmetrical shape with the yz plane passing through the center of rotation O as the plane of symmetry. Therefore, the protrusions 26A come close to the two magnets 22 of the magnetic field generating unit 21 in the same shape, and the effects on the magnetic flux density generated by each magnet 22 are substantially the same, and the magnetic field generated by the magnetic field generating unit 21. Does not distort. As a result, the detection accuracy can be maintained without affecting the detection of the magnetic flux density of the magnetic detection element 24, and the influence of the shape of the fixing metal member 25 when the magnetic detection element 24 detects the magnetic flux density is affected. Can be suppressed. Also in FIG. 7, the fitting portion 27 has an asymmetrical shape. As described above, there is no significant difference in the influence on the magnetic flux density detected by the magnetic detector 24 regardless of whether the shape of the fitting portion 27 is asymmetrical or symmetrical.
  • the two protrusions 26A of the fixing metal member 25A have a shape that overlaps with the yoke 23 but does not overlap with the magnet 22.
  • the magnetic field formed by the magnetic field generating portion 21 is affected by the fixing metal member 25A, and the magnetic detection element 24 is affected. It is unlikely that the magnetic flux density to be detected will decrease.
  • the mounting positions of the two protrusions 26A with respect to the magnetic field generating portion 21 may be rotated by 90 degrees so that the protrusions 26A overlap the magnet 22 but do not overlap the center of the yoke 23.
  • the protrusions 26A are arranged close to each of the two magnets of the magnetic field generating unit 21 in the same shape, the influence on the magnetic flux density generated by each magnet 22 is substantially the same, and the magnetic detector 24 detects. The magnetic field is not distorted.
  • the fitting portion 27 has an asymmetrical shape when viewed from the z direction, so that the direction of the burr can be determined. Even if the fitting portion 27 does not have an asymmetric shape, the shape of the fixing metal member 25A when viewed from the + z direction and the shape for fixing are used by using the shape of the protrusion 26A and the shape of the fitting portion 27.
  • the shape of the metal member 25A when viewed from the ⁇ z direction may be distinguished from the shape.
  • the fitting portion 27 has a shape having a plurality of uneven shapes and a symmetrical plane parallel to the z direction passing through the rotation center O of the gear 14, and the protrusion 26A is formed on the symmetrical plane of the fitting portion 27.
  • Arbitrary planes of symmetry parallel to the z direction passing through the center of rotation O of the gear 14 may not match.
  • the plane of symmetry thereof and the plane of symmetry of 26A do not coincide with each other. It's easy. By doing so, it is possible to determine which side of the fixing metal member 25A the burr is generated from the shape of the protrusion 26A and the shape of the fitting portion 27.
  • the fixing metal member 25B illustrated in FIG. 8 includes three protrusions 26B1, 26B2, and 26B3. When the three protrusions are not distinguished, they are simply referred to as protrusions 26B.
  • the three protrusions 26B are plane symmetric with the yz plane as the plane of symmetry. If the protrusion 26B is plane-symmetric with the yz plane as the plane of symmetry, the protrusions 26B1 and 26B3 are arranged close to each other in the same shape on the two magnets 22 of the magnetic field generating portion 21, so that the protrusion 26B gives the magnetic field lines. The effect is also plane symmetric with the yz plane as the plane of symmetry.
  • the influence of the protrusion 26B on each magnet 22 becomes substantially the same, and the occurrence of distortion of the shape of the magnetic field line passing through the magnetic detection element 24 due to the presence of the protrusion 26B is suppressed. As a result, the influence of the shape of the fixing metal member 25 when the magnetic detection element 24 detects the magnetic flux density can be suppressed.
  • three protrusions 26B1, 26B2 and 26B3 may be connected to form one protrusion 26B. In this case as well, since the protrusion 26B is plane-symmetric with the yz plane as the plane of symmetry, the influence of the protrusion 26B on the lines of magnetic force is also plane-symmetric with the yz plane as the plane of symmetry.
  • the influence of the protrusion 26B on each magnet 22 becomes substantially the same, and the occurrence of distortion of the shape of the magnetic field line passing through the magnetic detection element 24 due to the presence of the protrusion 26B is suppressed. Therefore, the influence of the magnetic detection element 24 on the detection accuracy can be suppressed.
  • the fixing metal member 25C illustrated in FIG. 9 includes three protrusions 26C.
  • the three protrusions 26C are plane-symmetrical with the yz plane as the plane of symmetry, and the three protrusions 26C are evenly provided on the circumference centered on the rotation center O of the gear 14. If the protrusions 26C are provided symmetrically and evenly with the yz plane as the plane of symmetry, the shapes of the protrusions 26C arranged close to the two magnets 22 of the magnetic field generating portion 21 will be the same, so that the yz plane will be the same. As a plane of symmetry, it becomes plane symmetric.
  • the influence of the protrusion 26C on each magnet 22 becomes substantially the same, and the occurrence of distortion of the shape of the magnetic field line passing through the magnetic detection element 24 due to the presence of the protrusion 26C is suppressed. Therefore, the influence of the magnetic detection element 24 on the detection accuracy can be suppressed.
  • the fitting portion 27 has an asymmetrical shape when viewed from the z direction, but may have a symmetrical shape.
  • the fitting portion 27 may be a surface passing through the center of rotation O and may be plane-symmetrical with a surface other than the yz plane as a symmetrical surface.
  • it can be determined which side of the fixing metal member 25B or 25C has a burr. The same applies when the number of protrusions 26B or 26C is an odd number of 4 or more.
  • the fixing metal member 25D includes four protrusions 26D.
  • the four protrusions 26D are plane-symmetrical with the yz plane as the plane of symmetry, and the four protrusions 26 are evenly provided on the circumference centered on the rotation center O of the gear 14. Therefore, even in the example shown in FIG. 10, the influence of the protrusion 26D on the magnetic field lines is that the shapes of the protrusions 26D arranged close to the magnet 22 of the magnetic field generating portion 21 are substantially the same, so that the yz plane is used as the plane of symmetry. It becomes plane symmetric.
  • the influence of the protrusion 26D on each magnet 22 becomes substantially the same, distortion of the detection magnetic flux of the magnetic detection element 24 can be less likely to occur, and the influence of the shape of the fixing metal member 25 can be suppressed.
  • the four protrusions 26D are plane-symmetrical with the yz plane as the plane of symmetry, the four protrusions 26D may not be evenly provided on the circumference centered on the rotation center O of the gear 14. .. Further, for the protrusion 26D, any symmetric plane parallel to the z direction passing through the rotation center O of the gear 14 is different from any symmetric plane parallel to the z direction passing through the rotation center O of the gear 14 for the fitting portion 27. , May not match.
  • the fixing metal member 25E includes five protrusions 26E, the five protrusions 26E are plane-symmetrical with the yz plane as a symmetric plane, and the five protrusions 26E are gears 14. It is evenly provided on the circumference centered on the rotation center O.
  • the influence of the protrusion 26E on the detection magnetic flux is also such that the shapes of the protrusions 26E arranged close to the magnet 22 of the magnetic field generating portion 21 are substantially the same, so that the plane is symmetrical with the yz plane as the plane. It becomes symmetric.
  • the influence of the protrusion 26E on each magnet 22 becomes substantially the same, distortion of the detection magnetic flux of the magnetic detection element 24 can be less likely to occur, and the influence of the shape of the fixing metal member 25 can be suppressed.
  • the protrusion 26 does not have to be provided symmetrically with the yz plane as the plane of symmetry.
  • the example shown in FIG. 12 is an example in which the fixing metal member 25B used in FIG. 8 is rotated 135 ° clockwise around the rotation center O of the shaft 15 and attached to the shaft 15.
  • the fixing metal member 25B shown in FIG. 12 includes three protrusions 26B as in the example shown in FIG. 8, but unlike the example shown in FIG. 8, the protrusion 26B is a surface having a yz plane as a symmetrical plane. Not placed symmetrically. However, even in this case, the effect of shielding the disturbance magnetic field can be obtained due to the presence of the fixing metal member 25B. Further, the presence of the three protrusions 26B also has an effect of more reliably transmitting the rotational force from the shaft 15 to the gear 14 via the fixing metal member 25B.
  • FIG. 13 it is a graph showing an output error when the fixing metal member 25B of FIG. 12 is used. As shown in the figure, in this case, a gain error and an offset error occur in the output error. On the other hand, if the fixing metal member 25B is arranged as shown in FIG. 8, no gain error and offset error occur in the output error.
  • the protrusions 26A to 26E the protrusions are placed close to the two magnets 22 that generate a magnetic field in the same shape, and the gain error when the magnetic detection element 24 detects them. It was found that the offset error can be suppressed, which is more preferable.
  • the end portion 15e of the shaft 15 is formed thinner than the shaft 15.
  • the fixing metal member 25 is attached so that the end portion 15e is inserted into the opening 25o of the fixing metal member 25.
  • the end portion 15e is gradually crushed and expanded.
  • the fixing metal member 25 is sandwiched and fixed between the main body portion of the shaft 15 and the crushed end portion 15e.
  • the shape of the end portion 15e of the shaft 15 may be a hollow tube shape.
  • the shaft 15 and the fixing metal member 25 may be attached by other methods such as high frequency welding and laser welding regardless of caulking.
  • the magnetic field generating portion does not include a yoke but includes a magnet 22b.
  • the magnet 22b is arranged between the fixing metal member 25 and the magnetic detection element 24, and the direction of the magnetic poles is perpendicular to the direction along the shaft 15.
  • the magnet 22b is molded by the magnet molding member 28, and together with the fixing metal member 25, is integrally molded with the gear 14 with resin.
  • the magnetic flux density of the magnet 22b exits the north pole, passes through the magnetic detector 24, and enters the south pole.
  • the magnetic detector 24 detects the passing magnetic flux density.
  • magnets of other shapes such as a circular magnet magnetized in the radial direction, a quadrangular magnet, and a magnet having an arc on the pole side can also be used. Further, it may be an elliptical magnet magnetized in the major axis direction or the minor axis direction.
  • the number of magnets does not have to be limited to one, and two or more magnets may be used.
  • the fixing metal member 25 suppresses the application of the disturbance magnetic field to the magnetic field lines generated by the magnet 22, so that the detection accuracy of the detection angle calculated from the magnetic flux density is deteriorated as in the first embodiment. Can be suppressed.
  • the shape of the protrusion 26 and the fitting portion 27 of the fixing metal member 25 is the same as the shape described in the first embodiment, and is plane-symmetric with respect to the plane of symmetry of the magnetic field lines generated by the magnet. Therefore, the same effect as described in the first embodiment is obtained.
  • the electronically controlled throttle 10 that controls the amount of intake air to the engine of the vehicle has been described as an example, but the EGR valve that controls the amount of exhaust gas recirculation of the EGR device, various valves used in the supercharger, or the water flow It can also be provided in a valve or the like for controlling the above and used to detect the opening degree of the rotated valve body. It may be used for moving bodies other than vehicles and equipment of facilities such as factories, and may be used to detect the rotation angles of various rotating bodies. The rotation angle range to be detected may be 360 degrees or less, or may be geared down to detect a rotation angle of 360 degrees or more.
  • the present disclosure is not limited to the above-described embodiment, and can be realized with various configurations within a range not deviating from the purpose.
  • the technical features of the embodiments corresponding to the technical features in each embodiment described in the column of the outline of the invention are for solving a part or all of the above-mentioned problems, or a part of the above-mentioned effects. Or, in order to achieve all of them, it is possible to replace or combine them as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be appropriately deleted.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
PCT/JP2020/021874 2019-06-28 2020-06-03 回転角度検出装置 Ceased WO2020261903A1 (ja)

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DE112020003112.8T DE112020003112T5 (de) 2019-06-28 2020-06-03 Drehwinkelerfassungsvorrichtung
CN202080046378.9A CN114026382B (zh) 2019-06-28 2020-06-03 旋转角度检测装置
US17/559,432 US11874109B2 (en) 2019-06-28 2021-12-22 Rotation angle detection device

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JP2019120743A JP7205403B2 (ja) 2019-06-28 2019-06-28 回転角度検出装置
JP2019-120743 2019-06-28

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US20220113124A1 (en) 2022-04-14
US11874109B2 (en) 2024-01-16
JP7205403B2 (ja) 2023-01-17
JP2021006775A (ja) 2021-01-21
CN114026382B (zh) 2025-01-03
CN114026382A (zh) 2022-02-08
DE112020003112T5 (de) 2022-05-05

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