WO2021187074A1 - 磁石構造体、回転角度検出器、及び、電動パワーステアリング装置 - Google Patents

磁石構造体、回転角度検出器、及び、電動パワーステアリング装置 Download PDF

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Publication number
WO2021187074A1
WO2021187074A1 PCT/JP2021/007761 JP2021007761W WO2021187074A1 WO 2021187074 A1 WO2021187074 A1 WO 2021187074A1 JP 2021007761 W JP2021007761 W JP 2021007761W WO 2021187074 A1 WO2021187074 A1 WO 2021187074A1
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WO
WIPO (PCT)
Prior art keywords
magnet structure
tubular member
molded body
diameter
magnet
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/JP2021/007761
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English (en)
French (fr)
Japanese (ja)
Inventor
森　尚樹
岡田　義明
黒嶋　敏浩
伸也 川島
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TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to CN202180021382.4A priority Critical patent/CN115280107A/zh
Priority to JP2022508181A priority patent/JP7759869B2/ja
Publication of WO2021187074A1 publication Critical patent/WO2021187074A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train

Definitions

  • the present invention relates to a magnet structure, a rotation angle detector, and an electric power steering device.
  • the rotation angle detector includes a magnet structure and a magnetic sensor, and the magnetic structure has a tubular member and a bonded magnet molded body provided on the tubular member.
  • the end of the rotating shaft is inserted and fixed into the cylindrical member of the magnet structure. From the viewpoints of attachability between the shaft and the tubular member, suppression of detachment of the tubular member from the shaft due to vibration, improvement of sensor accuracy, etc., further improvement in dimensional accuracy of the tubular member is required. There is.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnet structure having excellent dimensional accuracy, and a rotation angle detector and an electric power steering device using the magnet structure.
  • the magnet structure according to the present invention includes a resin tubular member and a bonded magnet molded body filled in the tubular member.
  • the tubular member may have a concave portion or a convex portion in a portion in contact with the bonded magnet molded body.
  • the concave portion or the convex portion can extend in the axial direction of the tubular member.
  • the magnet structure can have a plurality of concave portions or convex portions.
  • the plurality of concave portions or convex portions can be arranged apart from each other in the circumferential direction in the tubular member.
  • the tubular member can further have a space portion that communicates with the outside of the tubular member and is not filled with the bonded magnet molded body.
  • the magnet structure can have a convex portion or a concave portion on the inner surface of the space portion.
  • the inner surface of the space portion can have an uneven surface.
  • the inner surface of the space portion may have one or more convex portions extending in the axial direction of the tubular member.
  • the inner surface of the space portion can have a convex portion that can be fitted with a concave portion inserted into the inner surface of the space portion.
  • the tubular member has a first cylindrical portion and a second tubular portion having an inner diameter smaller than that of the first tubular portion.
  • the bonded magnet molded body can be provided in the first cylinder portion or the second cylinder portion.
  • the tubular member has a first cylindrical portion and a second tubular portion having an inner diameter smaller than that of the first tubular portion.
  • the bonded magnet molded body is provided in either the first cylinder portion or the second cylinder portion, and is provided.
  • the contour shape of the cross section perpendicular to the axis of the inner surface of either the first cylinder portion or the second cylinder portion can be non-circular.
  • the tubular member has a large-diameter tubular portion, a small-diameter tubular portion having an inner diameter smaller than that of the large-diameter tubular portion, and a connecting tubular portion that connects the large-diameter tubular portion and the small-diameter tubular portion, and the bond.
  • the magnet molded body is provided in the large-diameter cylinder portion, and the contour shape of the cross section perpendicular to the axis of the inner surface of the small-diameter cylinder portion can be non-circular.
  • the tubular member has a large-diameter tubular portion, a small-diameter tubular portion having an inner diameter smaller than that of the large-diameter tubular portion, and a connecting tubular portion that connects the large-diameter tubular portion and the small-diameter tubular portion.
  • the bonded magnet molded body can be provided in the large-diameter tubular portion.
  • the tubular member has a large-diameter tubular portion, a small-diameter tubular portion having an inner diameter smaller than that of the large-diameter tubular portion, and a connecting tubular portion that connects the large-diameter tubular portion and the small-diameter tubular portion.
  • the thickness of the tubular portion can be larger than the thickness of the large-diameter tubular portion and the small-diameter tubular portion.
  • the rotation angle detector according to the present invention includes the above-mentioned magnet structure and a magnetic sensor.
  • the electric power steering device includes the above-mentioned rotation angle detector.
  • a magnet structure having excellent dimensional accuracy and a rotation angle detector and an electric power steering device obtained by using the magnet structure. Can be done.
  • FIG. 2A is a cross-sectional view including the central axis C of the tubular member 2 included in the magnet structure according to the first embodiment of the present invention
  • FIG. 2B is FIG. 2A. It is an enlarged view of the vicinity of the recess 6c.
  • FIG. 3A is a cross-sectional view including the central axis C of the magnet structure 10 according to the first embodiment of the present invention
  • FIG. 3B is an enlargement of the vicinity of the recess 6c in FIG. 3A. It is a figure. (A) and (b) of FIG.
  • FIG. 4 are enlarged cross-sectional views including a central axis C in the vicinity of a recess of the magnet structure according to another embodiment of the present invention, respectively. It is sectional drawing which includes the central axis C of the magnet structure 10 which concerns on still another Embodiment of this invention.
  • 6 (a) and 6 (b) are perspective views of the tubular member 2 included in the magnet structure according to another embodiment of the present invention, respectively.
  • 7 (a) and 7 (b) are perspective views of the tubular member 2 included in the magnet structure according to another embodiment of the present invention, respectively.
  • 8 (a) and 8 (b) are perspective views of the tubular member 2 included in the magnet structure according to another embodiment of the present invention, respectively.
  • FIG. 10A is a cross-sectional view including the central axis C of the magnet structure 10 according to another embodiment of the present invention
  • FIG. 10B is a top view of the tubular member 2 of FIG. 10A. It is sectional drawing which includes the central axis C of the magnet structure 10 which concerns on other embodiment of this invention.
  • 12 (a) and 12 (b) are perspective views of the bottom surface side of the tubular member 2 included in the magnet structure according to another embodiment of the present invention, respectively.
  • FIG. 13 is a partially broken disassembled perspective view of the magnet structure 10 according to another embodiment of the present invention.
  • FIG. 14 is a partially broken disassembled perspective view of the magnet structure 10 according to another embodiment of the present invention.
  • FIG. 15 is a partially broken disassembled perspective view of the magnet structure 10 according to another embodiment of the present invention.
  • FIG. 16 is an exploded cross-sectional view of the magnet structure 10 according to another embodiment of the present invention along the axis. 17 (a) is a top view of the cylindrical member 2 of FIG. 16, and FIG. 17 (b) is a top view of the shaft 122 of FIG.
  • FIG. 18 is a cross-sectional view including a central axis of the magnet structure according to another embodiment of the present invention.
  • FIG. 19 is a cross-sectional view including a central axis of the magnet structure according to another embodiment of the present invention.
  • FIG. 3 is a block configuration diagram showing an electric power steering device 150 in which the motor assembly 110 of FIG. 21 is used.
  • [Magnet structure] (First Embodiment) 1 and 2 are perspective views and cross-sectional views of a tubular member 2 included in the magnet structure 10 according to the first embodiment of the present invention, respectively.
  • the tubular member 2 has a cylindrical shape having a hollow portion penetrating in the axial direction.
  • the tubular member 2 has a large diameter tubular portion (first tubular portion) 2a on the upper end 2V side, a small diameter tubular portion (second tubular portion) 2c on the lower end (end) 2L side, and a large diameter tubular portion 2a and a small diameter.
  • An annular plate (connecting cylinder portion) 2b for connecting these to the cylinder portion 2c is provided.
  • the outer diameter d1 and the inner diameter d2 of the large diameter tubular portion 2a are larger than the outer diameter d3 and the inner diameter d4 of the small diameter tubular portion 2c, respectively.
  • the outer diameter d1 of the large diameter tubular portion 2a can be, for example, 2 to 30 mm.
  • the outer diameter d3 of the small diameter tubular portion 2c can be, for example, 2 to 30 mm.
  • the inner diameter d2 of the large diameter tubular portion 2a can be, for example, 1 to 29 mm.
  • the inner diameter d4 of the small diameter tubular portion 2c can be, for example, 1 to 29 mm.
  • the thickness t of the tubular member 2 can be, for example, 0.3 to 3 mm, preferably 0.5 to 2 mm.
  • the height (length in the central axis C direction) H1 of the cylindrical member 2 shown in FIG. 2A can be, for example, 3 to 25 mm, preferably 5 to 20 mm.
  • the ratio of the height H2 of the large-diameter tubular portion 2a and the height H3 of the small-diameter tubular portion 2c to the height H1 of the tubular member 2 can be 30 to 70%, respectively.
  • the tubular member 2 has a recess 6 on the inner peripheral surface 2as of the large-diameter cylindrical portion 2a.
  • the recess 6 refers to an internal space that extends outward in the radial direction of the large-diameter tubular portion 2a with respect to the inner peripheral surface of the large-diameter tubular portion 2a that is the reference surface.
  • FIG. 2B is an enlarged view of a cross section including the central axis C of the recess 6 in FIG. 2A.
  • the shape of the recess 6 is triangular in the cross section including the central axis C.
  • the magnet structure 10 has a plurality of recesses 6.
  • eight recesses 6 are arranged at equal intervals in the circumferential direction on the inner peripheral surface 2as of the large-diameter tubular portion 2a.
  • the distance Lc between the recess 6 and the upper end 2V of the cylindrical member 2 shown in FIGS. 1 and 2A is, for example, 0.3 to 5.0 mm and 0.5 to 3.0 mm. May be good.
  • the inner surface of the recess 6 has a deeper recess on the lower end 2L side than on the upper end 2V side of the tubular member 2 with respect to the inner peripheral surface 2as of the large diameter tubular portion 2a.
  • the slope 6a is inclined so as to be shallower on the lower end 2L side than on the upper end 2V side of the tubular member 2 with respect to the inner peripheral surface 2as of the large diameter tubular portion 2a.
  • the large-diameter tubular portion 2a has a pair of side surfaces 6c facing each other in the circumferential direction.
  • the angle ⁇ formed by the slope 6a and the slope 6b and the inner peripheral surface 2as of the large-diameter tubular portion 2a may be, for example, 1 to 90 °. can.
  • the lengths of the slope 6a and the slope 6b in the cross section of FIG. 2B may be the same as each other and the cross-sectional shape may be an isosceles triangle, or they may be different from each other and the cross-sectional shape may be an isosceles triangle. It may be a right triangle (for example, one slope and an inner peripheral surface are at right angles).
  • the height (length in the central axis C direction) LHH of the recess 6 in the central axis C direction can be, for example, 0.1 to 2.0 mm, preferably 0.2 to 1.0 mm. ..
  • Radial depth L HD recess 6 can be, for example, a 0.1 ⁇ 2.0 mm, is preferably 0.2 ⁇ 1.0 mm.
  • the width L HW along the circumferential direction of the recess 6 shown in FIG. 2A can be, for example, 0.3 to 3.0 mm, preferably 0.5 to 2.0 mm.
  • the tubular member 2 is made of resin.
  • the resin may be a thermoplastic resin or a cured product of a thermosetting resin.
  • thermoplastic resins are polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile butadiene styrene (ABS), acrylonitrile styrene (AS), polymethyl methacrylate (PMMA), polyvinyl.
  • So-called general-purpose plastics such as alcohol (PVA), polyvinylidene chloride (PVDC), polyethylene terephthalate (PET); polycarbonate (PC), polyphenylene ether (PPE), polyamide (PA), polyacetal (POM), polybutylene terephthalate, etc.
  • engineering plastics polyphthalamide (PPA), polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polysulfone (PSU), polyethersulfone (PES), polyetherimide (PEI), polyamideimide (PAI), poly Ether Ether Ketone (PEEK), so-called super engineering plastics such as polytetrafluoroethylene (PTFE).
  • thermosetting resins examples include phenol resin (PF), urea resin (UF), melamine resin (MF), unsaturated polyester resin (UP), epoxy resin (EP), silicone resin (SI), and polyurethane resin (PUR). ).
  • the resin constituting the tubular member 2 may contain one kind of resin, but may also contain two or more kinds of resins.
  • the magnet structure 10 has a cylindrical member 2 and a bonded magnet molded body 4.
  • the bond magnet molded body 4 has a substantially cylindrical shape, has an end surface (upper exposed surface) 4t perpendicular to the central axis C of the tubular member 2 on the upper end 2V side of the tubular member 2, and is on the opposite side of the end surface 4t. It has a lower surface 4s perpendicular to the central axis C.
  • the bond magnet molded body 4 fills the inside of the large-diameter tubular portion 2a so as to come into contact with the inner peripheral surface 2as of the large-diameter tubular portion 2a and the inner surface 2bs of the annular plate 2b, and also fills the inside of the recess 6. .. That is, the bond magnet molded body 4 has a protrusion 4c that protrudes into the recess 6 and is in contact with the inner surface of the recess 6.
  • the recess 6 and the protrusion 4c make it difficult for the bond magnet molded body 4 to fall off from the tubular member 2 in the direction of the upper end 2V. Further, as shown in FIG. 3A, the pair of side surfaces 6c of the recess 6 are in contact with the protrusions 4c of the bond magnet molded body 4 from both sides in the circumferential direction of the large diameter tubular portion 2a. As a result, the displacement of the large-diameter tubular portion 2a of the bonded magnet molded body 4 in the circumferential direction can be suppressed.
  • the bonded magnet molded body 4 is not filled inside the small-diameter cylindrical portion 2c of the tubular member 2 of the magnet structure 10, and as will be described later, from the lower end 2L side of the tubular member 2 to the steering wheel shaft of an automobile or the like.
  • the shaft can be inserted and fixed.
  • the end face 4t of the bonded magnet molded body 4 is arranged inside the upper end 2V of the cylindrical member 2 in the axial direction of the cylinder.
  • the distance E between the end surface 4t of the bonded magnet molded body 4 and the upper end 2V of the tubular member 2 can be, for example, 0.02 to 0.25 mm, preferably 0.02 to 0.20 mm.
  • the distance E between the end face 4t of the bond magnet molded body 4 and the upper end 2V side of the tubular member 2 is 0.02 mm or more, even if the bonded magnet molded body 4 expands in a harsh temperature change environment, the cylindrical member It becomes difficult to protrude from the end face of 2, and it becomes easy to prevent damage or falling off due to an external force. Since the distance E between the end face 4t of the bond magnet molding 4 and the upper end 2V of the tubular member 2 is 0.25 mm or less, the distance between the bond magnet molding 4 and the magnetic sensor does not become too large, and the magnetic sensor becomes It is easier to receive enough magnetic field to detect.
  • the north and south poles of the bonded magnet molded body 4 can be separated in a direction perpendicular to the central axis C as described later (see FIG. 20).
  • Bond magnet molded body 4 contains resin and magnet powder.
  • An example of the resin is a cured product of a thermosetting resin or a thermoplastic resin, and an example thereof is as described above in the section of the tubular member 2.
  • the bond magnet molded body 4 may contain one kind of resin alone, or may contain two or more kinds of resins.
  • the magnet powder examples include rare earth magnet powder and ferrite magnet powder. From the viewpoint of obtaining high magnetic properties, the magnet powder is preferably a rare earth magnet powder.
  • the average particle size of the magnet powder is, for example, 30 to 250 ⁇ m.
  • the bonded magnet molded body 4 may contain one type of magnet powder alone, or may contain two or more types of magnet powder.
  • the tubular member 2 is made of resin. Therefore, it is possible to easily mass-produce a product having a precise shape by using a mold. On the other hand, when the tubular member 2 is made of metal as in the conventional case, it is manufactured by press working or the like, so it is difficult to improve the dimensional accuracy.
  • Improvement of dimensional accuracy brings the following effects. For example, when the roundness of the tubular member 2 is improved, the roundness of the bonded magnet molded body 4 formed inside can also be improved, and the angle detection accuracy due to the magnetic field generated by the bonded magnet molded body 4 is improved. do. Further, when the deviation between the center of gravity at the lower end 2L of the tubular member 2 and the center of gravity at the upper end 2V of the tubular member 2 and the design central axis of the cylindrical member becomes smaller, the bond magnet molded body 4 during rotation becomes smaller. Since the eccentricity is suppressed, the accuracy of detecting the angle due to the magnetic field is improved. Further, when the dimensional accuracy of the large-diameter tubular portion 2a is improved, the volume variation of the bonded magnet molded body 4 is reduced, the individual difference in the magnetic characteristics of the magnet structure 10 is reduced, and the detection accuracy is improved.
  • the tubular member 2 having the recess 6 is manufactured.
  • the manufacturing method of the tubular member 2 is not particularly limited, and for example, injection molding, compression molding, casting molding, and the like can be adopted.
  • the bond magnet molded body 4 is formed in the large-diameter cylindrical portion 2a of the tubular member 2.
  • the tubular member 2 provided with the recess 6 as described above is fixed in, for example, in the first mold so that the large-diameter cylindrical portion 2a faces the first mold side.
  • a second mold having a columnar protrusion that fills the inside of the small-diameter tubular portion 2c is attached to the first mold, and the mold is closed.
  • the raw material composition containing the resin and the magnet powder is fluidized by heating or the like, injected into the mold, and solidified by cooling or the like, whereby the bonded magnet molded body 4 is formed in the large-diameter tubular portion 2a. NS.
  • the bond magnet molded body 4 is an isotropic bond magnet molded body
  • injection molding in the filling step is performed without a magnetic field.
  • the bond magnet molded body 4 is an anisotropic bond magnet molded body
  • injection molding in the filling step is performed in a magnetic field.
  • a method of forming the bond magnet molded body 4 in the tubular member 2 another method of fitting the bond magnet molded body 4 manufactured by compression molding, extrusion molding, or the like into the tubular member 2 can be mentioned. ..
  • the bond magnet molded body 4 may be fixed to the tubular member 2 using an adhesive.
  • the adhesion between the tubular member 2 and the bonded magnet molded body 4 tends to be high.
  • FIG. 4 are enlarged cross-sectional views including the central axis C of the cylindrical member 2 according to the other embodiment, respectively.
  • a convex portion 6'with a triangular cross section is provided in the embodiment (a) of FIG. 4 instead of the concave portion 6 having a triangular cross section.
  • the radial height LHD'and the circumferential width of the convex portion 6' can be set in the same manner as the radial depth LHD and the width LHW of the concave portion 6 of the first embodiment, respectively.
  • the height LHH of the convex portion 6'in the central axis C direction can be set in the same manner as in the first embodiment.
  • the bond magnet molded body 4 is provided so as to cover the surface of the convex portion 6', and has a concave portion corresponding to the convex portion 6'.
  • a concave portion 6 having a rectangular cross section is provided instead of the concave portion 6 having a triangular cross section.
  • the radial depth LHD, the height LHH in the central axis C direction, and the circumferential width of the recess 6 can be set in the same manner as in the first embodiment.
  • the bond magnet molded body 4 is provided so as to fill the recess 6, and has a protrusion corresponding to the recess 6.
  • FIG. 5 is a cross-sectional view including a central axis C of the magnet structure 10 according to still another embodiment of the present invention.
  • the magnet structure 10 of the present embodiment has an annular plate 2d at the upper end of the large-diameter tubular portion 2a in which the tubular member 2 is in contact with the peripheral edge of the end surface 4t of the bonded magnet molded body 4.
  • the annular plate 2d further suppresses the upward removal of the bond magnet molded body 4.
  • the radial distance 2da at which the annulus plate 2d covers the end surface 4t of the bonded magnet molded body 4 can be 1 to 3 mm.
  • FIGS. 6A and 6B are perspective views of the tubular member 2 used in the magnet structure 10 according to still another embodiment of the present invention.
  • the difference between these embodiments and the first embodiment is the shape of the recess 6.
  • the recess 6 extends in the axial direction and reaches the upper end 2V of the large diameter tubular portion 2a.
  • the cross-sectional shape of the recess 6 perpendicular to the central axis C is rectangular in FIG. 6 (a) and triangular in FIGS. 6 (b) and 7 (a).
  • a predetermined gap is arranged in the circumferential direction between the recesses 6, but in FIG.
  • the recesses 6 are provided adjacent to each other in the circumferential direction. There is. Therefore, it can be seen that the convex portions are provided adjacent to each other instead of the concave portions.
  • the radial depth and the circumferential width of the recess 6 can be set in the same manner as in the first embodiment.
  • FIG. 5 may be provided to provide a retaining function.
  • FIG. 7B is a perspective view of the tubular member 2 used in the magnet structure 10 according to still another embodiment of the present invention.
  • This embodiment differs from FIG. 6B in that a convex portion 6'with a triangular cross section perpendicular to the central axis C is provided instead of the concave portion 6 having a triangular cross section perpendicular to the central axis C. It is a point.
  • the radial height of the convex portion 6' can be set in the same manner as in the form of FIG. 4A.
  • the width of the convex portion 6'in the circumferential direction can be set in the same manner as in the first embodiment.
  • the convex portion 6' extends to the upper end 2V of the cylindrical member 2 and is open, the convex portion 6'may be prevented from reaching the upper end 2V and may be provided with a retaining function. Further, a ring plate 2d as shown in FIG. 5 may be provided to provide a retaining function.
  • FIG. 8 (a) and 8 (b) are perspective views of the tubular member 2 used in the magnet structure 10 according to still another embodiment of the present invention, and is a perspective view of the large diameter tubular portion 2a of FIG. 8 (a).
  • the large-diameter cylindrical portion 2a in FIG. 8 (b) has a convex portion 6'extending in the axial direction.
  • the cross-sectional shape of the recess 6 perpendicular to the C axis is a concave arc.
  • the cross-sectional shape of the convex portion 6'perpendicular to the C axis is a convex arc.
  • three concave portions 6 and three convex portions 6' are provided at equal intervals in the circumferential direction.
  • FIG. 8A and FIG. May be given.
  • a ring plate 2d as shown in FIG. 5 may be provided to provide a retaining function.
  • FIG. 9 is a perspective view of the tubular member 2 used in the magnet structure 10 according to still another embodiment of the present invention.
  • the difference between this embodiment and the first embodiment is the extending direction of the recess 6 formed on the inner peripheral surface 2as of the large diameter tubular portion 2a.
  • some of the plurality of recesses 6 are parallel to each other and extend in a direction oblique to the central axis C when viewed from a direction perpendicular to the central axis C.
  • the remaining plurality of recesses 6 are parallel to each other and extend in a direction oblique to the central axis when viewed from a direction perpendicular to the central axis C, intersect with some of the plurality of recesses 6, and as a whole.
  • Recesses 6 are formed in an oblique lattice shape.
  • the width, depth, and the like of the recess 6 can be appropriately set as in the first embodiment.
  • a convex portion may be used instead of the concave portion.
  • the inner peripheral surface 2as may have an uneven surface (texture surface) region 8'described later. The size of the uneven surface area and the like can be described later.
  • FIG. 10 (a) is an M cross-sectional view including the central axis C of the magnet structure 10 according to still another embodiment of the present invention
  • FIG. 10 (b) is a tubular shape of FIG. 10 (a). It is a top view of the member.
  • a plurality of recesses 6 are provided not on the inner peripheral surface 2as of the large-diameter tubular portion 2a but on the inner surface 2bs of the annular plate 2b.
  • the plurality of recesses 6 are provided at equal intervals in the circumferential direction.
  • the shape of the recess 6 is a cylinder, but the shape is not particularly limited and may be a prism or the like.
  • the depth of the recess 6 can be 0.1 to 2.0 mm, and the diameter of the recess 6 can be 0.1 to 5.0 mm.
  • FIG. 11 is a cross-sectional view including the central axis C of the magnet structure 10 according to still another embodiment of the present invention.
  • the thickness 2bt of the annular plate 2b is thicker than the thickness of the large-diameter tubular portion 2a and the small-diameter tubular portion 2c.
  • the ratio of the thickness 2bt of the annular plate 2b to the thickness of the large-diameter tubular portion 2a and the small-diameter tubular portion 2c can be 1.2 to 5 times.
  • the direction of the magnetic flux passing through the magnetic sensor changes, and the angle error becomes large.
  • the tubular member 2 according to the present embodiment is made of resin, it is easy to partially change the wall thickness by injection molding or the like, and the degree of freedom in design is high.
  • the structure of such an annular plate 2b can be combined not only with the first embodiment but also with the various tubular members described above.
  • 12 (a) and 12 (b) are perspective views including the bottom surface of the magnet structure 10 according to still another embodiment of the present invention.
  • the magnet structure 10 of FIG. 12A differs from the first embodiment in that the contour shape perpendicular to the central axis C of the inner surface of the small-diameter tubular portion 2c is not circular but has a rectangular shape having a straight portion L. It is a point that has been done.
  • the magnet structure 10 of FIG. 12 (b) differs from the first embodiment in that the contour shape perpendicular to the central axis C of the inner surface of the small-diameter barrel portion 2c is not circular, but is opposed to both ends in a circle. This is a point having a barrel shape having a straight portion L.
  • the contour shape inside the small diameter cylinder portion 2c is non-circular, it is easy to suppress the idling of the shaft inserted inside the small diameter cylinder portion 2c.
  • the tubular member according to the present embodiment is made of resin, it is easy to make the contour shape of the inner surface of the small-diameter cylindrical portion 2c non-circular by injection molding or the like, and the degree of freedom in design is high.
  • the structure of such a small-diameter cylindrical portion 2c can be combined not only with the first embodiment but also with the various tubular members described above.
  • the example in which the contour shape inside the small diameter tubular portion 2c is non-circular is not limited to the above.
  • the shape of the other portion may be an arc. , It may be an ellipse without having a straight part.
  • FIG. 13 is a perspective view of the magnet structure 10 according to still another embodiment of the present invention.
  • the difference between the magnet structure 10 according to the present embodiment and the magnet structure shown in FIG. 8A is that (1) the large-diameter tubular portion (first tubular portion) 2a and the small-diameter tubular portion (second tubular portion).
  • the outer diameters of 2c are the same, and (2) the uneven surface (texture surface) region 8'is formed on the inner surface of the small diameter tubular portion 2c.
  • a space portion V that communicates with the outside of the tubular member 2 and is not filled with the bond magnet molded body 4 is provided, and a textured surface region 8'is provided on the inner surface of the space portion V.
  • An example of the pattern of the uneven surface region 8' is a group of concave or convex portions such as wrinkles, satin finishes, hairlines, and disc-shaped protrusions. This pattern can be a repeating pattern.
  • Such a concavo-convex surface region 8' can be formed by roughing the surface of the molding die, machining the inner surface of the small-diameter tubular portion after molding, or the like.
  • the ratio of the area of the uneven surface region 8' is not particularly limited, but it is preferably 50% or more with respect to the total area of the inner peripheral surface of the small diameter tubular portion 2c.
  • the maximum height difference (surface roughness) in the uneven surface region 8' can be 0.01 to 0.2 mm.
  • the inner / outer diameter and height H2 of the large diameter tubular portion 2a, the inner / outer diameter and height H3 of the small diameter tubular portion 2c, and the height H1 of the tubular member 2 are set in the same manner as described in the first embodiment described above. can do.
  • the wall thickness of the large-diameter tubular portion 2a can be 0.3 to 3 mm, and the wall thickness of the small-diameter tubular portion can be 0.5 to 14.5 mm.
  • the shaft 122 is inserted into the small diameter tubular portion 2c, and the shaft 122 and the small diameter tubular portion 2c are fitted to each other.
  • the wall thickness of the small diameter cylinder portion 2c can be made thicker than the wall thickness of the large diameter cylinder portion 2a, cracking of the small diameter cylinder portion 2c due to the insertion of the shaft 122 can be suppressed. Further, no special processing is required for the shaft 122, which is highly versatile.
  • FIG. 14 is a perspective view of the magnet structure 10 according to still another embodiment of the present invention.
  • the difference between this embodiment and the magnet structure of FIG. 13 is that a plurality of convex portions 8 extending in the axial direction are provided on the inner surface of the space portion V of the small-diameter tubular portion 2c instead of the uneven surface region 8'. It is a point.
  • Each of the convex portions 8 extends in the axial direction and reaches from one end (bottom portion) to the other end (opening) of the space portion V of the small diameter tubular portion 2c.
  • the convex portion 8 may be formed only in a part of the space portion V from one end to the other end in the axial direction.
  • the cross-sectional shape perpendicular to the axis of the convex portion 8 is a convex arc.
  • three convex portions 8 are provided so as to be arranged at equal intervals in the circumferential direction.
  • the height of the convex portion 8 can be 0.1 to 1.0 mm, and the width of the convex portion 8 in the circumferential direction can be 0.1 to 5.0 mm.
  • the shaft 122 is inserted into the small diameter tubular portion 2c, and the shaft 122 and the small diameter tubular portion 2c are fitted to each other.
  • the frictional force with the small-diameter tubular portion 2c increases, and fixing by more reliable fitting becomes possible. Further, no special processing is required for the shaft 122, which is highly versatile.
  • FIG. 15 is a perspective view of the magnet structure 10 according to still another embodiment of the present invention.
  • the difference between this embodiment and the magnet structure of FIG. 13 is that the cross section of the small-diameter tubular portion 2c is perpendicular to the axis of the space portion V of the small-diameter tubular portion 2c instead of the uneven surface region 8'on the inner surface of the space portion V of the small-diameter tubular portion 2c.
  • the contour is a point having a straight portion L in part.
  • the outline of the cross section of the space portion V has a D-shaped shape in which the straight portion L and the arc portion are combined.
  • the outline of the cross section may be non-circular, may be rectangular as shown in FIG. 12 (a), may be barrel-shaped as shown in FIG. 12 (b), and has no straight portion. May be an ellipse. Further, the shape of the non-circular cross section does not have to continue from the back to the opening exit in the space portion V, and a part of the back side, that is, the cross section of the opening is circular, but the cross section of the back side. May be non-circular.
  • a notch 122D is also provided at the tip of the shaft 122, and the outline of the cross section of the tip of the shaft 122 is D-shaped.
  • 16 and 17 are an exploded cross-sectional view of the magnet structure 10 and a top view of a cylindrical member and a shaft according to still another embodiment of the present invention.
  • the difference between this embodiment and the magnet structure of FIG. 13 is that instead of the uneven surface region 8'on the inner surface of the space portion V of the small diameter tubular portion 2c, a tubular member is formed on the inner surface of the space portion V of the small diameter tubular portion 2c. It is a point where a plurality of convex portions 8 projecting toward the axis of the above are formed.
  • the height of the convex portion 8 can be 0.05 to 0.5 mm.
  • a plurality of convex portions 8 are provided so as to be separated from each other in the circumferential direction.
  • the tip of the shaft 122 is also provided with a plurality of recesses 122G capable of accommodating the convex portion 8.
  • Each of the convex portions 8 can be fitted into the concave portion 122G.
  • the convex portion 8 has a surface 8R that comes into contact with the inner surface of the concave portion 122G of the shaft 122 when viewed from the axial direction as shown in FIG. 17A, as shown in FIG. Has a surface 8S that contacts the recess 122G of the shaft 122 when viewed from a direction perpendicular to the axis.
  • the shaft 122 when the magnet structure 10 is used, the shaft 122 is inserted into the small diameter tubular portion 2c, and the concave portion 122G and the convex portion 8 of the shaft 122 are fitted to prevent rotation and removal. It exerts its function and enables fixing by more reliable fitting.
  • the number of the concave portions 6 and the convex portions 6' may be one or more, respectively, and may be 1 to 10 or 3 to 8 from the viewpoint of more stably fixing the bonded magnet molded body 4. good.
  • the plurality of concave portions 6 or convex portions 6' are arranged on the inner surface of the tubular member 2 at equal intervals in the circumferential direction, but they may be arranged at different intervals from each other.
  • the plurality of concave portions 6 or convex portions 6' may be arranged so as to be axially separated from each other.
  • the tubular member 2 may have both a concave portion 6 and a convex portion 6'.
  • the shape of the cross section including the central axis C of the concave portion 6 and the convex portion 6', or the shape of the cross section perpendicular to the central axis C of the concave portion 6 and the convex portion 6' is a quadrangle, a triangle, or an arc shape.
  • it may be an elliptical arc, another polygon, or the like.
  • the corner of each shape may have a rounded shape.
  • the concave portion or the convex portion may not be separated in the circumferential direction as in the first embodiment, and for example, the concave portion or the convex portion may extend in the circumferential direction to form a ring.
  • the tubular member 2 always includes the convex portion 6'or the concave portion 6, but the concave portion and the convex portion may not be provided.
  • the contact surfaces of the tubular member 2 and the bonded magnet molded body 4 are melted by heating, and solidified and integrated by cooling. Therefore, the bonded magnet molded body 4 and the tubular member 2 are combined. Adhesion is improved. As a result, it is easy to suppress the misalignment between the cylindrical member 2 and the bonded magnet molded body 4.
  • the bond magnet molded body 4 When the bond magnet molded body 4 is integrally molded with the tubular member 2 by injection molding, the volume of the bond magnet molded body is reduced because the injection pressure is applied to the bond magnet molded body 4 during molding. After molding, when the injection pressure is released, the volume of the bonded magnet molded body expands. As a result, the bond magnet molded body 4 applies pressure to the inner surface of the large-diameter tubular portion 2a of the tubular member 2, and the bond magnet molded body 4 is less likely to fall off or shift from the tubular member 2, and has a large diameter. Even if there is no convex or concave portion on the inner surface of the tubular portion 2a, it can function as a retaining / rotating stopper.
  • the number of convex portions 8 on the inner surface of the space portion V of the tubular member 2, that is, the inner surface of the small-diameter cylindrical portion 2c may be one or more, respectively, and from the viewpoint of more stably fixing the shaft 122, 1 to 10 It may be, and it may be 3 to 8.
  • the plurality of convex portions 8 are arranged on the inner surface of the tubular member 2 at equal intervals in the circumferential direction, but may be arranged at different intervals from each other.
  • the plurality of convex portions 8 may be arranged so as to be axially separated from each other.
  • the space portion V of the tubular member 2 may have a concave portion instead of the convex portion 8, and may have both a concave portion and a convex portion.
  • the shaft 122 has a convex portion instead of the concave portion and can be fitted with the concave portion of the space portion V.
  • the shape of the cross section of the convex portion 8 of the space portion V may be a quadrangle, a triangle, an elliptical arc, another polygon, or the like, in addition to the arc shape. Further, when the shape of the convex portion in the cross section is a quadrangle, a triangle, another polygon, or the like, the corners of each shape may have roundness.
  • the convex portions 8 of the space portion V do not have to be separated in the circumferential direction, and may extend in the circumferential direction to form a ring, for example.
  • the tubular member 2 has a large-diameter tubular portion 2a, an annular plate 2b, and a small-diameter tubular portion 2c
  • the annular plate 2b is a connecting cylinder capable of connecting the large-diameter tubular portion 2a and the small-diameter tubular portion 2c.
  • it may be a tapered tube instead of a flat annular plate.
  • at least the inner diameter of the large diameter cylinder portion 2a may be larger than the inner diameter of the small diameter cylinder portion 2c. That is, in the present specification, the "large diameter cylinder portion" means having an inner diameter larger than that of the "small diameter cylinder portion”, and does not necessarily mean having an outer diameter larger than that of the "small diameter cylinder portion”.
  • the entire tubular member is a tapered tube whose outer diameter and inner diameter become smaller from one end to the other end in the axial direction, and a bonded magnet molded body may be filled on either end side. ..
  • the tubular member includes a straight pipe portion and a tapered pipe portion which is connected to the straight pipe portion and whose inner diameter and outer diameter expand as the distance from the straight pipe portion increases, and a bond magnet is provided on the straight pipe portion or the tapered pipe portion. It may be in the form of being filled with a molded body.
  • the tubular member may include a straight pipe portion and a barrel-shaped portion connected to the straight pipe portion, and the straight pipe portion or the barrel-shaped portion may be filled with a bonded magnet molded body.
  • the barrel-shaped portion has a shape in which the outer diameter and the inner diameter increase as the distance from the straight pipe portion increases, but the inner diameter and the outer diameter decrease as the distance from the straight pipe portion exceeds a certain value. .. When the bond magnet molded body is arranged in the barrel-shaped portion, the action of preventing the bond magnet molded body from coming off occurs.
  • the bond magnet molded body 4 is filled only in the large-diameter tubular portion 2a of the tubular member 2, but the bond magnet molded body 4 may also be filled in a part of the small-diameter tubular portion 2c.
  • the bond magnet molded body 4 may be filled in the small diameter tubular portion 2c instead of the large diameter tubular portion 2a.
  • the concave portion 6 and the convex portion 6' can be provided on the inner surface of the small diameter tubular portion 2c instead of the large diameter tubular portion 2a of the tubular member 2.
  • the shaft is inserted into the large-diameter tubular portion 2a, and the lower end (end face) 2L of the small-diameter tubular portion 2c faces the magnetic sensor.
  • the tubular member 2 of the magnet structure 10 shown in FIG. 18 has a large-diameter tubular portion 2a and a small-diameter tubular portion 2c having an inner diameter and an outer diameter smaller than those of the large-diameter tubular portion 2a and the large-diameter tubular portion 2a, as in FIGS. have.
  • a concave portion 6 (may be a convex portion 6') is provided in the small diameter tubular portion 2c
  • a concave-convex surface region 8'(may be a convex portion 8) is provided in the large diameter tubular portion 2a.
  • the bond magnet molded body 4 is provided in the small diameter tubular portion 2c, and the bond magnet molded body 4 has irregularities corresponding to the concave portion 6 (may be the convex portion 6').
  • a space portion V not filled with the bonded magnet molded body is provided in the large-diameter tubular portion 2a, and the shaft is inserted into the large-diameter tubular portion 2a.
  • the tubular member 2 of the magnet structure 10 shown in FIG. 19 has a smaller inner diameter than the large diameter tubular portion 2a and the large diameter tubular portion 2a, but has the same outer diameter. It has 2c.
  • a concave portion 6 (may be a convex portion 6') is provided in the small diameter tubular portion 2c, and a concave-convex surface region 8'(may be a convex portion 8) is provided in the large diameter tubular portion 2a.
  • the bond magnet molded body 4 is provided in the small diameter tubular portion 2c, and the bond magnet molded body 4 has irregularities corresponding to the concave portion 6 (may be the convex portion 6').
  • a space portion V not filled with the bonded magnet molded body is provided in the large-diameter tubular portion 2a, and the shaft is inserted into the large-diameter tubular portion 2a.
  • the height of the tubular member 2 H1 the height of the large-diameter tubular portion 2a (the length of the portion having a relatively large inner diameter) H2, and the height of the small-diameter tubular portion 2c (inner diameter).
  • H3 the distance E between the end face 4t of the bond magnet molded body 4 and the end 2L of the tubular member 2 can be the same as in the above embodiment. Further, in the embodiments shown in FIGS.
  • the outer diameter d1 of the large diameter cylinder portion 2a is 3 to 101 mm
  • the inner diameter d2 of the large diameter cylinder portion 2a is 2 to 100 mm
  • the inner diameter d4 of the small diameter cylinder portion 3d is 1 to 29 mm.
  • the outer diameter d3 of the small diameter tubular portion 2c can be 2 to 30 mm.
  • the outer diameter of the shaft is larger than the outer diameter of the bonded magnet molded body.
  • the magnetizing direction of the bonded magnet molded body is the axial direction and the shaft is a magnetic material such as iron, the magnetic flux leakage from the lower surface side of the magnet is eliminated and the magnetic flux emitted from the upper surface side (sensor side) is increased. It becomes possible.
  • tubular member 2 may further have a tubular portion having a diameter different from that of the large diameter tubular portion 2a and the small diameter tubular portion 2c as described above.
  • tubular member 2 may be a straight pipe having a constant inner diameter and outer diameter along the central axis C direction, or may have a constant outer diameter and only the inner diameter different from each other in the axial direction, and the inner diameter is constant. Only the outer diameters may differ from each other in the axial direction.
  • the tubular member 2 is a large-diameter cylinder.
  • the large diameter cylinder portion 2a and the small diameter cylinder portion 2c can be directly connected (joined), so that the annular plate (connecting cylinder portion) can be formed.
  • the annular plate 2b does not necessarily have to be provided separately from the small-diameter tubular portion 2c and the large-diameter tubular portion 2a.
  • any cross-sectional shape including the central axis C of the tubular member 2 is axisymmetric with respect to the central axis C.
  • the outer shape of the cylindrical member 2 in the cross section perpendicular to the central axis C is circular, but it may be polygonal such as octagonal or dodecagonal. Even in this case, the contour of the inner surface of the tubular member 2 in the cross section perpendicular to the central axis C is preferably circular.
  • the upper end 2V and the lower end 2L of the tubular member 2 communicate with each other, but the tubular member 2 may have an isolation wall that blocks this communication.
  • the annular plate 2b may be a disk having no hole in the center.
  • the upper end 2V of the tubular member 2 may be provided with a flange portion extending outward in the radial direction.
  • the north pole and the south pole of the bond magnet molded body 4 are separated in the direction perpendicular to the central axis C, but depending on the usage situation of the magnet structure 10, the bond magnet molded body 4
  • the north pole and the south pole may be separated in other directions such as separated in the central axis C direction.
  • the end surface 4t of the bonded magnet molded body 4 is arranged inside the cylinder by a distance E from the upper end 2V of the tubular member 2, but even if the distance E is 0, it is arranged inside. Minus, that is, even if the end surface 4t of the bonded magnet molded body 4 projects outward from the upper end 2V of the cylindrical member 2, the implementation is possible.
  • FIG. 20 is a perspective perspective view showing a rotation angle detector 20 according to an embodiment of the present invention.
  • the rotation angle detector 20 according to the present embodiment includes the magnet structure 10 and the magnetic sensor 12.
  • the magnetic sensor 12 is arranged above the end surface (exposed surface) 4t of the bonded magnet molded body 4 of the magnet structure 10 with a certain gap from the magnet structure 10.
  • the gap between the magnet structure 10 and the magnetic sensor 12 can be appropriately selected according to the magnetic characteristics of the magnet structure 10 and the detection performance of the magnetic sensor 12.
  • the magnetic sensor 12 detects the magnetic field generated from the magnet structure 10.
  • the magnetic sensor 12 has, for example, a detection circuit composed of a Wheatstone bridge circuit or the like, and has a magnetoresistive effect element (MR element) as a magnetic detection element of the Wheatstone bridge circuit.
  • the MR element include a tunnel magnetoresistive element (TMR element), an anisotropic magnetoresistive element (AMR element), and a giant magnetoresistive element (GMR element).
  • TMR element tunnel magnetoresistive element
  • AMR element anisotropic magnetoresistive element
  • GMR element giant magnetoresistive element
  • a TMR element is preferably used for the magnetic sensor 12.
  • the magnetic sensor 12 can be a biaxial type having two MR elements, and detects the direction of the magnetic field in a plane orthogonal to the central axis C of the magnet structure 10.
  • the north pole and the south pole of the bonded magnet molded body 4 are arranged apart from each other in the direction perpendicular to the central axis C.
  • a static magnetic field as shown in M is generated around the magnet structure 10
  • a magnetic field in a direction perpendicular to the central axis C is generated on the central axis C of the tubular member 2. Since the direction of the magnetic field on the central axis changes according to the rotation position of the magnet structure 10 in the rotation direction R, the magnetic sensor 12 detects the direction of the magnetic field to detect the rotation angle of the magnet structure 10. be able to.
  • a shaft 122 such as a handle shaft of an automobile is inserted from the small-diameter cylindrical portion 2c side of the tubular member 2 into a space portion in the tubular member 2 where the bond magnet molded body 4 is not filled, and has a magnet structure. It is fixed to the body 10. Then, the magnet structure 10 rotates in the direction R about the central axis of the tubular member 2 in conjunction with the rotation of the shaft 122. Therefore, the rotation angle of the shaft 122 can be detected by detecting the rotation angle of the magnet structure 10.
  • the motor assembly 110 including the rotation angle detector 20 according to the present embodiment will be described with reference to FIG. 21.
  • the motor assembly 110 includes a rotation angle detector 20, an electric motor 120, and a housing 112 that houses them.
  • the electric motor 120 includes a shaft 122 having a torque side end portion 122a and a sensor side end portion 122b.
  • the torque side end portion 122a of the shaft 122 is rotatably held by a ball bearing 114A provided in the housing 112.
  • the sensor side end 122b is rotatably held by a ball bearing 114B provided on the housing 112.
  • a rotation angle detector 20 that is, a magnet structure 10 and a magnetic sensor 12 are arranged at the end 122b on the sensor side.
  • the magnet structure 10 is attached to the sensor-side end 122b of the shaft 122 of the electric motor 120.
  • the magnet structure 10 rotates together with the shaft 122, so that the direction of the magnetic field generated by the magnet structure 10 changes according to the rotation of the electric motor 120.
  • the magnetic sensor 12 is arranged inside the housing 112 at a position facing the magnet structure 10.
  • the rotation angle detector 20 detects the rotation angle of the electric motor 120 by utilizing the fact that the resistance value of the magnetic sensor 12 continuously changes according to the direction of the magnetic field generated by the magnet structure 10.
  • the change in the resistance value of the magnetic sensor 12 is measured by a detection circuit composed of, for example, a Wheatstone bridge circuit or the like.
  • the electric power steering device 150 includes a control unit 152 generally called an Electronic Control Unit (ECU) and a steering wheel 154 in addition to the motor assembly 110 described above.
  • the control unit 152 receives a vehicle speed signal from the vehicle, information on the rotation angle of the shaft 122 detected by the rotation angle detector 20 of the motor assembly 110, and a torque signal of the torque sensor 156 regarding the steering force of the steering wheel 154. Is configured to allow Further, the control unit 152 is configured so that the current for driving the electric motor 120 can be adjusted.
  • the control unit 152 receives the vehicle speed signal and the torque signal, it sends a current corresponding to them to the electric motor 120 for power assist to drive the electric motor 120, and the torque of the shaft 122 assists the snake maneuvering force. conduct.
  • the control unit 152 feedback-controls the current of the electric motor 120 according to the rotation angle of the shaft 122 received from the rotation angle detector 20, and adjusts the amount of power assist.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Power Steering Mechanism (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
PCT/JP2021/007761 2020-03-19 2021-03-01 磁石構造体、回転角度検出器、及び、電動パワーステアリング装置 Ceased WO2021187074A1 (ja)

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