WO2024121997A1 - トルクセンサ - Google Patents

トルクセンサ Download PDF

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Publication number
WO2024121997A1
WO2024121997A1 PCT/JP2022/045171 JP2022045171W WO2024121997A1 WO 2024121997 A1 WO2024121997 A1 WO 2024121997A1 JP 2022045171 W JP2022045171 W JP 2022045171W WO 2024121997 A1 WO2024121997 A1 WO 2024121997A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
magnetic flux
circuit board
torque sensor
protrusions
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/JP2022/045171
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English (en)
French (fr)
Japanese (ja)
Inventor
祐一 外山
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.)
JTEKT Corp
Original Assignee
JTEKT 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 JTEKT Corp filed Critical JTEKT Corp
Priority to PCT/JP2022/045171 priority Critical patent/WO2024121997A1/ja
Priority to JP2024562496A priority patent/JPWO2024121997A1/ja
Publication of WO2024121997A1 publication Critical patent/WO2024121997A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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

Definitions

  • This disclosure relates to a torque sensor.
  • Patent Document 1 discloses a torque sensor that detects the torque applied to a rotating shaft.
  • a rotating shaft includes an input shaft and an output shaft that is connected to the input shaft via a torsion bar.
  • the torque sensor of Patent Document 1 includes a permanent magnet that rotates integrally with the input shaft, a pair of yoke cores that rotate integrally with the output shaft, a pair of magnetism collecting rings arranged on the outer periphery of the pair of yoke cores, a magnetic sensor that generates a signal according to magnetic flux, and a circuit board on which the magnetic sensor is mounted.
  • Each magnetism collecting ring has a ring portion and a protrusion that protrudes radially outward from the ring portion.
  • the circuit board has a notch that penetrates in the plate thickness direction at a location corresponding to the magnetic sensor.
  • the circuit board is assembled to the torque sensor so that the magnetic sensor is arranged between the protrusions of the pair of magnetism collecting rings and one of the protrusions of the pair of magnetism collecting rings is arranged within the notch.
  • the protrusions of the pair of magnetic flux collecting rings can be arranged close to each other, and the gap between these protrusions can be made small. This increases the amount of magnetic flux passing through the magnetic sensor, improving the signal-to-noise ratio (S/N) of the signal output from the magnetic sensor.
  • the dimensional tolerances and assembly tolerances of the magnetic flux collecting ring and the circuit board must be strictly controlled so that the protrusions do not interfere with the circuit board.
  • a torque sensor configured to detect torque applied to a rotating shaft.
  • the rotating shaft includes a first shaft and a second shaft connected to the first shaft via a torsion bar.
  • the torque sensor includes a permanent magnet configured to rotate integrally with the first shaft, a first yoke core and a second yoke core configured to rotate integrally with the second shaft, a first magnetic flux collector arranged at a distance between the first yoke core and the second yoke core, a magnetic sensor configured to generate a signal corresponding to the magnetic flux flowing through the first magnetic flux collector and the second magnetic flux collector, and a circuit board on which the magnetic sensor is mounted.
  • the first magnetic flux collector has a first main body portion facing the first yoke core and a first protrusion protruding from the first main body portion.
  • the second magnetic flux collector has a second main body portion facing the second yoke core and a second protrusion protruding from the second main body portion and facing the first protrusion.
  • the magnetic sensor is disposed on the circuit board between the first protrusion and the second protrusion.
  • the circuit board has a recess at a position corresponding to the magnetic sensor. At least a portion of the magnetic sensor is disposed within the recess. The entirety of each of the first protrusion and the second protrusion is disposed outside the recess.
  • FIG. 2 is an exploded perspective view of the torque sensor according to the first embodiment.
  • FIG. 2 is a partial cross-sectional view taken along an axial direction of the torque sensor of FIG. 1 .
  • FIG. 2 is a perspective view showing a first magnetic flux collecting member, a second magnetic flux collecting member, and a circuit board constituting the torque sensor of FIG. 1, as viewed from below.
  • 4 is an enlarged cross-sectional view taken along the axial direction of the torque sensor in FIG. 1 near a magnetic sensor, and is a cross-sectional view taken along line IV-IV in FIG. 2.
  • FIG. 11 is an enlarged cross-sectional view taken along the axial direction of a portion near a magnetic sensor in a torque sensor according to a second embodiment.
  • cylindrical refers to a cylindrical shape as a whole, and includes a cylindrical shape formed by combining multiple parts and a C-shaped shape having a notch or the like.
  • shape of the "cylindrical” includes, but is not limited to, a circular shape, an ellipse, and a polygonal shape having sharp or rounded corners when viewed in the axial direction.
  • the shape of the "annular” refers to a circular shape, an ellipse, and a polygonal shape having sharp or rounded corners when viewed in the axial direction, and includes, but is not limited to, a circular shape, an ellipse, and a polygonal shape having sharp or rounded corners when viewed in the axial direction.
  • “opposite” refers to surfaces or members facing each other, and includes not only cases where the surfaces or members are completely facing each other, but also cases where the surfaces or members are partially facing each other.
  • opposite refers to both cases where a member other than the two parts is interposed between the two parts and cases where nothing is interposed between the two parts.
  • the torque sensor 1 is provided around a rotating shaft 2.
  • the rotating shaft 2 is rotatably accommodated in a housing 3.
  • the rotating shaft 2 includes an input shaft 4 as a first shaft, a torsion bar 5, and an output shaft 6 as a second shaft.
  • the input shaft 4 and the output shaft 6 are connected to each other via the torsion bar 5.
  • the input shaft 4, the torsion bar 5, and the output shaft 6 are located on the same axis L.
  • the rotating shaft 2 is a pinion shaft of a rack-and-pinion mechanism constituting a steering device of a vehicle
  • the housing 3 is a gear housing that accommodates the rack-and-pinion mechanism.
  • a steering wheel is connected to an upper end of the pinion shaft via an intermediate shaft and a column shaft.
  • the rotating shaft 2 may be a column shaft.
  • the torque sensor 1 includes a permanent magnet 11 that rotates integrally with the input shaft 4, a magnetic yoke assembly 12 that rotates integrally with the output shaft 6, and a fixed unit 13 that is fixed to the housing 3.
  • a permanent magnet 11 that rotates integrally with the input shaft 4
  • a magnetic yoke assembly 12 that rotates integrally with the output shaft 6
  • a fixed unit 13 that is fixed to the housing 3.
  • the magnetic flux passing through the first magnetic flux collecting member 41 and the second magnetic flux collecting member 42 changes according to the magnitude of the torque input by the driver.
  • the torque sensor 1 detects the torque applied to the rotating shaft 2 based on this change in magnetic flux. Each component of the torque sensor 1 will be described in detail below.
  • the permanent magnet 11 is a cylindrical ring magnet. In this embodiment, the permanent magnet 11 has a circular shape when viewed in the axial direction.
  • the permanent magnet 11 is magnetized in the radial direction of the permanent magnet 11 so that magnetic poles of different polarities are arranged alternately in the circumferential direction.
  • the permanent magnet 11 is fixed to the outer circumferential surface of the input shaft 4 via a holder (not shown) or directly so as to be rotatable together with the outer circumferential surface of the input shaft 4.
  • the permanent magnet 11 may be a plurality of plate-shaped magnets.
  • the magnetic yoke assembly 12 includes a first yoke core 21, a second yoke core 22, and a yoke holder 23 that holds the first yoke core 21 and the second yoke core 22.
  • the magnetic yoke assembly 12 is disposed on the outer periphery of the permanent magnet 11 with a gap therebetween.
  • the magnetic yoke assembly 12 is fixed to the outer periphery of the output shaft 6 via a holder (not shown) or directly so as to be rotatable together with the output shaft 6.
  • Each of the first yoke core 21 and the second yoke core 22 is made of a magnetic material and has an annular shape.
  • each of the first yoke core 21 and the second yoke core 22 has a circular shape when viewed in the axial direction.
  • the first yoke core 21 and the second yoke core 22 are arranged at intervals along the axis L.
  • the first yoke core 21 and the second yoke core 22 each have a plurality of teeth 24, 25 that face the permanent magnet 11 in the radial direction.
  • the teeth 24, 25 protrude in a direction approaching each other.
  • the teeth 24 are provided at equal intervals in the circumferential direction on the first yoke core 21, and the teeth 25 are provided at equal intervals in the circumferential direction on the second yoke core 22.
  • the teeth 24 and the teeth 25 are arranged alternately in the circumferential direction.
  • the yoke holder 23 is made of, for example, a resin material and has a cylindrical shape. In this embodiment, the yoke holder 23 has a circular shape when viewed in the axial direction. The yoke holder 23 holds the first yoke core 21 and the second yoke core 22 so that, for example, the inner surfaces of the teeth 24, 25 are exposed to the inner periphery of the yoke holder 23.
  • the yoke holder 23 in this embodiment is a resin molded product formed by insert molding with the first yoke core 21 and the second yoke core 22 as insert parts.
  • the first yoke core 21 and the second yoke core 22 are not insert parts, and the first yoke core 21 and the second yoke core 22 may be assembled to a separately formed yoke holder 23.
  • the fixed unit 13 includes a magnetic flux collecting assembly 31, an outer case 32 that holds the magnetic flux collecting assembly 31, two magnetic sensors 33a and 33b, and a circuit board 34 on which the magnetic sensors 33a and 33b are mounted.
  • the fixed unit 13 is attached to the housing 3.
  • the magnetic flux collecting assembly 31 includes a first magnetic flux collecting member 41, a second magnetic flux collecting member 42, and a magnetic flux collecting holder 43 that holds the first magnetic flux collecting member 41 and the second magnetic flux collecting member 42.
  • the magnetic flux collecting assembly 31 may further include a shielding member that is disposed on the outer periphery of the first magnetic flux collecting member 41 and the second magnetic flux collecting member 42.
  • the first magnetic collecting member 41 is disposed on the outer periphery of the first yoke core 21 with a gap therebetween.
  • the first magnetic collecting member 41 has an annular first main body portion 51 and two first protrusions 52a, 52b.
  • the first main body portion 51 has a C-shape when viewed in the axial direction.
  • the first main body portion 51 faces the first yoke core 21 in the radial direction.
  • the first protrusions 52a, 52b protrude radially outward from the first main body portion 51, i.e., radially outward from the rotating shaft 2 perpendicular to the axis L.
  • the first protrusions 52a, 52b are disposed at a predetermined interval from each other in the circumferential direction.
  • the first protrusions 52a, 52b are, for example, rectangular plate-shaped when viewed in the axial direction.
  • the first protrusions 52a, 52b each have a first opposing surface 53a, 53b that axially faces the second protrusions 62a, 62b of the second magnetic flux collecting member 42 (see FIG. 4).
  • the first magnetic flux collecting member 41 is formed, for example, by bending a long metal plate made of a magnetic material. In other embodiments, the first magnetic flux collecting member 41 may be divided into a member constituting the first main body portion 51 and a member constituting the first protrusions 52a and 52b.
  • the second magnetic flux collecting member 42 is disposed on the outer periphery of the second yoke core 22 with a gap between them.
  • the second magnetic flux collecting member 42 has an annular second main body 61 and two second protrusions 62a, 62b.
  • the second main body 61 has a C-shape when viewed in the axial direction.
  • the second main body 61 faces the second yoke core 22 in the radial direction.
  • the second protrusions 62a, 62b protrude from the second main body 61 radially outward, that is, radially outward from the rotating shaft 2.
  • the second protrusions 62a, 62b are disposed at a predetermined interval from each other in the circumferential direction.
  • the second protrusions 62a, 62b are, for example, rectangular plate-shaped when viewed in the axial direction.
  • the second protrusions 62a, 62b have second opposing surfaces 63a, 63b that face the first protrusions 52a, 52b in the axial direction, respectively (see FIG. 4).
  • the second magnetic collecting member 42 is formed, for example, by bending a long metal plate made of a magnetic material.
  • the second magnetic collecting member 42 may be divided into a member constituting the second main body portion 61 and a member constituting the second protrusions 62a, 62b.
  • the second magnetic collecting member 42 in this embodiment has the same shape as the first magnetic collecting member 41, but this is not limited thereto, and the second magnetic collecting member 42 may have a different shape from the first magnetic collecting member 41.
  • the magnetic flux collector holder 43 is made of, for example, a resin material and is generally cylindrical. Specifically, the magnetic flux collector holder 43 has a cylindrical holder body 71, and a first protruding wall 72 and a second protruding wall 73 provided on the outer peripheral surface of the holder body 71.
  • the holder body 71 has a circular shape when viewed in the axial direction.
  • the first protruding wall 72 protrudes radially outward from one axial end of the holder body 71.
  • the second protruding wall 73 protrudes radially outward from the other axial end of the holder body 71.
  • the first protruding wall 72 faces the second protruding wall 73 with an axial gap between them.
  • the magnetic flux collector holder 43 holds the first magnetic flux collector 41 so that the inner circumferential surface of the first main body portion 51 is exposed to the inner circumferential surface of the holder body 71 and the first protrusions 52a, 52b protrude to the outer circumferential side of the holder body 71.
  • the first protruding wall 72 has first base portions 74a, 74b that support the first protrusions 52a, 52b.
  • the first base portions 74a, 74b have a shape that exposes, for example, the first opposing surfaces 53a, 53b of the first protrusions 52a, 52b and the side surfaces of the tip portions of the first protrusions 52a, 52b.
  • the first base portions 74a, 74b have a shape that covers, for example, the surface of the first protrusions 52a, 52b opposite the first opposing surfaces 53a, 53b and the side surfaces of the base end portions of the first protrusions 52a, 52b.
  • the magnetic flux collecting holder 43 holds the second magnetic flux collecting member 42 such that the inner circumferential surface of the second main body portion 61 is exposed to the inner circumferential surface of the holder main body 71 and the second protrusions 62a, 62b protrude to the outer circumferential side of the holder main body 71.
  • the second protruding wall 73 has second pedestal portions 75a, 75b that support the second protrusions 62a, 62b.
  • the second pedestal portions 75a, 75b have a shape that exposes, for example, the second opposing surfaces 63a, 63b of the second protrusions 62a, 62b and the side surfaces of the tip portions of the second protrusions 62a, 62b.
  • the magnetic flux collector holder 43 is a resin molded product formed, for example, by insert molding with the first magnetic flux collector member 41 and the second magnetic flux collector member 42 as insert parts.
  • the magnetic flux collector holder 43 is a part of the magnetic flux collector assembly 31 made of a resin material.
  • the first magnetic flux collector member 41 and the second magnetic flux collector member 42 may not be inserted parts, and may be assembled to a magnetic flux collector holder 43 that is formed separately.
  • the magnetic flux collector holder 43 may be divided into a member that holds the first magnetic flux collector member 41 and a member that holds the second magnetic flux collector member 42, and these members may be assembled to each other.
  • the outer case 32 is a resin molded product formed by insert molding with the magnetic flux collector assembly 31 as an insert.
  • the outer case 32 has a cylindrical case body 81 and a protruding portion 82 that protrudes radially outward from the magnetic flux collector assembly 31.
  • the case body 81 has a circular shape when viewed in the axial direction.
  • the case body 81 mainly covers the outer peripheral surface of the holder body 71 of the magnetic flux collector holder 43.
  • the protruding portion 82 is, for example, cylindrical and protrudes in a direction perpendicular to the axis L. In this embodiment, the protruding portion 82 has a rectangular shape when viewed in the direction perpendicular to the axial direction.
  • the protruding portion 82 mainly covers the outer surfaces of the first protruding wall 72 and the second protruding wall 73 of the magnetic flux collector holder 43.
  • the open end of the protruding portion 82 is closed by a cover (not shown).
  • the outer case 32 is attached immovably to the housing 3. As a result, even if the rotating shaft 2 rotates, the first magnetic collecting member 41 and the second magnetic collecting member 42 do not rotate.
  • the outer case 32 is attached to the housing 3 so that the first magnetic collecting member 41 is positioned above the second magnetic collecting member 42 in the direction of gravity.
  • the outer case 32 may be attached to the housing 3 so that the first magnetic collecting member 41 is positioned below the second magnetic collecting member 42 in the direction of gravity.
  • the interior of the magnetic collecting holder 43 is connected to the interior of the housing 3 via the case main body 81.
  • the magnetic sensors 33a and 33b are for detecting the magnetic flux flowing through the first magnetic collecting member 41 and the second magnetic collecting member 42, and are, for example, Hall sensors or magnetic resistance sensors.
  • One of the magnetic sensors 33a and 33b is a redundant sensor used when the other fails.
  • the magnetic sensors 33a and 33b each have an element body 91a and 91b configured to detect the magnetic flux, and a connection terminal 92a and 92b connected to the wiring pattern of the circuit board 34.
  • the magnetic sensor 33a is disposed on the circuit board 34 between the first protrusion 52a of the first magnetic collecting member 41 and the second protrusion 62a of the second magnetic collecting member 42.
  • the magnetic sensor 33b is disposed on the circuit board 34 between the first protrusion 52b of the first magnetic collecting member 41 and the second protrusion 62b of the second magnetic collecting member 42.
  • the circuit board 34 is, for example, a rectangular plate.
  • the circuit board 34 is housed in the protruding portion 82 so that the thickness direction of the circuit board 34 is aligned with the axis L.
  • the circuit board 34 is electrically connected to a terminal (not shown) provided in the protruding portion 82.
  • the circuit board 34 has a first main surface 101 on the side where the first protrusions 52a, 52b are arranged, and a second main surface 102 on the side where the second protrusions 62a, 62b are arranged, i.e., the side opposite the first main surface 101.
  • the magnetic sensors 33a, 33b are arranged on the edge of the circuit board 34.
  • the circuit board 34 has recesses 103a, 103b at positions corresponding to the magnetic sensors 33a, 33b. In this embodiment, the recesses 103a, 103b have bottoms 104a, 104b, respectively, and do not penetrate the circuit board 34 in the plate thickness direction.
  • the bottoms 104a, 104b close one end side of the recesses 103a, 103b so that the recesses 103a, 103b do not penetrate the circuit board 34 in the plate thickness direction.
  • the thickness of the bottoms 104a and 104b is thinner than the thickness of other parts of the circuit board 34.
  • the circuit board 34 has thin plate parts at positions corresponding to the magnetic sensors 33a and 33b that are thinner than the other parts.
  • the recesses 103a and 103b are open to the second main surface 102 of the circuit board 34 and to the side surface 105 corresponding to the edge.
  • the recesses 103a and 103b are in a rectangular shape with one side on the second main body 61 side of the second magnetic collecting member 42 open and the other three sides closed.
  • the bottoms 104a and 104b close one end of the recesses 103a and 103b so that the recesses 103a and 103b do not open to the first main surface 101.
  • the recesses 103a and 103b in this embodiment are rectangular, but are not limited thereto, and may be semicircular, for example, as long as the portion on the second main body 61 side of the second magnetic collecting member 42 is open, as in the rectangular shape.
  • the width of the recesses 103a and 103b (left and right direction in FIG. 4) is sufficient to be the minimum size capable of receiving at least a part of the element body 91a and 91b of the magnetic sensors 33a and 33b, and the width is not unnecessarily large.
  • the connection terminals 92a and 92b are omitted from FIG. 3. In this embodiment, most of the element body 91a and 91b of the magnetic sensors 33a and 33b and the entire connection terminals 92a and 92b are disposed in the recesses 103a and 103b, respectively.
  • the entire magnetic sensors 33a, 33b i.e., the entire element bodies 91a, 91b and the entire connection terminals 92a, 92b, may be disposed in the recesses 103a, 103b, respectively.
  • the connection terminals 92a, 92b are connected to wiring patterns that extend to the bottoms 104a, 104b in the recesses 103a, 103b, respectively.
  • the tips of the connection terminals 92a, 92b may extend outside the recesses 103a, 103b, and the connection terminals 92a, 92b may be connected to wiring patterns outside the recesses 103a, 103b, respectively.
  • the magnetic sensors 33a, 33b are covered with potting resin materials 105a, 105b that are filled in the recesses 103a, 103b, respectively.
  • the potting resin materials 105a, 105b are made of, for example, silicone gel or epoxy resin.
  • the entire element bodies 91a, 91b and the entire connection terminals 92a, 92b are covered with the potting resin materials 105a, 105b, respectively.
  • this is not limited to the above, and for example, a portion of the element bodies 91a, 91b may be exposed from the potting resin materials 105a, 105b, respectively.
  • the circuit board 34 is assembled to the torque sensor 1 such that the magnetic sensors 33a, 33b are disposed between the first protrusions 52a, 52b and the second protrusions 62a, 62b, respectively.
  • the entire first protrusions 52a, 52b are disposed outside the recesses 103a, 103b, respectively.
  • the entire second protrusions 62a, 62b are disposed outside the recesses 103a, 103b, respectively.
  • the first protrusions 52a, 52b, the bottoms 104a, 104b of the recesses 103a, 103b, the magnetic sensors 33a, 33b, and the second protrusions 62a, 62b are disposed in this order from the upper side in the direction of gravity.
  • At least a part of the magnetic sensors 33a, 33b is disposed in the recesses 103a, 103b of the circuit board 34, so that the first protrusions 52a, 52b and the second protrusions 62a, 62b can be disposed close to each other. This makes it possible to prevent the gap between the first protrusions 52a, 52b and the second protrusions 62a, 62b from becoming large. Furthermore, the entire first protrusions 52a, 52b and the second protrusions 62a, 62b are disposed outside the recesses 103a, 103b.
  • the recesses 103a, 103b each have a bottom 104a, 104b that closes the recesses 103a, 103b so that they do not penetrate the circuit board 34 in the plate thickness direction. Therefore, compared to when the recesses 103a, 103b are shaped to penetrate the plate thickness direction, or when the entire circuit board 34 is made uniformly thin without providing recesses or notches in the circuit board 34, a decrease in strength of the circuit board 34 can be suppressed.
  • the bottoms 104a, 104b are present between the magnetic sensors 33a, 33b and the first protrusions 52a, 52b, respectively.
  • the sides of the magnetic sensors 33a, 33b facing the first protrusions 52a, 52b are covered by the bottoms 104a, 104b, respectively. This makes it possible to prevent foreign matter such as metal pieces from adhering to the side of the magnetic sensors 33a, 33b facing the first protrusions 52a, 52b, compared to when the recesses 103a, 103b are shaped to penetrate through the plate thickness direction.
  • the bottoms 104a and 104b are respectively interposed between the magnetic sensors 33a and 33b and the first protrusions 52a and 52b.
  • liquid that has traveled from the inner periphery of the magnetic collection holder 43 through the first main body 51 of the first magnetic collection member 41 to the first protrusions 52a and 52b can be prevented from adhering to the magnetic sensors 33a and 33b.
  • the torque sensor 1 is provided around the rotating shaft 2 so that the first protrusions 52a, 52b are positioned higher in the direction of gravity than the second protrusions 62a, 62b.
  • liquid such as rainwater tends to move downward in the direction of gravity due to gravity.
  • the first protrusions 52a, 52b are disposed above the magnetic sensors 33a, 33b in the direction of gravity.
  • the bottoms 104a, 104b are respectively interposed between the magnetic sensors 33a, 33b and the first protrusions 52a, 52b, so that liquid that reaches the first protrusions 52a, 52b is unlikely to adhere to the magnetic sensors 33a, 33b.
  • the second protrusions 62a, 62b are disposed below the magnetic sensors 33a, 33b in the direction of gravity. Therefore, liquid that reaches the second protrusions 62a, 62b is unlikely to adhere to the magnetic sensors 33a, 33b. Therefore, in a torque sensor 1 having recesses 103a, 103b opening into the second main surface 102 of the circuit board 34 and having first protrusions 52a, 52b arranged within the recesses 103a, 103b, it is very effective to adopt a configuration in which the first protrusions 52a, 52b are arranged above the second protrusions 62a, 62b in the direction of gravity.
  • the torque sensor 1 includes potting resin materials 105a, 105b that are filled into the recesses 103a, 103b so as to cover the magnetic sensors 33a, 33b. This effectively prevents foreign matter from adhering to the magnetic sensors 33a, 33b.
  • the recesses 203a and 203b in this embodiment are shaped to penetrate the circuit board 34 in the thickness direction. Specifically, the recesses 203a and 203b open to the first main surface 101, the second main surface 102, and the side surface 105 corresponding to the edge portion of the circuit board 34, respectively.
  • At least a part of the magnetic sensors 33a and 33b is disposed in the recesses 103a and 103b.
  • the entire element bodies 91a and 91b of the magnetic sensors 33a and 33b, except for the tips of the connection terminals 92a and 92b, are disposed in the recesses 203a and 203b.
  • a part of the element bodies 91a and 91b may be disposed outside the recesses 203a and 203b.
  • the center positions of the element bodies 91a and 91b in the plate thickness direction may or may not coincide with the center positions of the recesses 203a and 203b in the plate thickness direction.
  • the connection terminals 92a and 92b are connected to the wiring patterns provided on the first main surface 101. In other embodiments, the connection terminals 92a and 92b may be connected to the wiring patterns provided on the second main surface 102.
  • the circuit board 34 is attached to the torque sensor 1 so that the magnetic sensors 33a and 33b are disposed between the first protrusions 52a and 52b and the second protrusions 62a and 62b, respectively.
  • the first protrusions 52a and 52b, the magnetic sensors 33a and 33b, and the second protrusions 62a and 62b are disposed in this order from the top in the direction of gravity.
  • the recesses 203a, 203b are shaped to penetrate the circuit board 34 in the plate thickness direction. Therefore, the recesses 203a, 203b can be made deeper than when a bottom that closes the recesses 203a, 203b is provided on the circuit board 34. This allows a larger portion of the magnetic sensors 33a, 33b to be disposed within the recesses 203a, 203b, and allows the first protrusions 52a, 52b and the second protrusions 62a, 62b to be disposed closer to each other.
  • the torque sensor 1 does not need to include the potting resin materials 105a and 105b.
  • the recesses 203a and 203b may be filled with a potting resin material, and at least a portion of the magnetic sensors 33a and 33b may be covered with the potting resin material.
  • the first protrusions 52a, 52b may protrude from the first body portion 51 to one side in the axial direction, and the second protrusions 62a, 62b may protrude from the second body portion 61 to the other side in the axial direction.
  • the second protrusions 62a, 62b are arranged to face the first protrusions 52a, 52b with a radial gap between them.
  • the circuit board 34 may also be arranged so that its plate thickness direction is perpendicular to the axis L.
  • the first magnetic flux collecting member 41 may have only one first protrusion.
  • the second magnetic flux collecting member 42 may have only one second protrusion.
  • the fixed unit 13 does not have to include the outer case 32.
  • the fixed unit 13 may include only one magnetic sensor.
  • the first magnetic flux collecting member 41 may be opposed to the first yoke core 21 in the axial direction.
  • the first main body portion 51 may be, for example, flat, and its shape may be changed as appropriate.
  • the second magnetic flux collecting member 42 may be opposed to the second yoke core 22 in the axial direction.
  • the shape of the magnetic flux collector holder 43 may be changed as appropriate.
  • the magnetic flux collector holder 43 does not need to have the first protruding wall 72 and the second protruding wall 73.
  • the torque sensor 1 may be configured to detect the rotation angle of the rotating shaft 2 in addition to the torque.
  • the torque sensor 1 further includes, for example, a main gear provided on the magnetic yoke assembly 12 and one or more driven gears meshing with the main gear. Then, the rotation angle of the rotating shaft 2 can be detected based on the rotation angle of the driven gear.
  • the permanent magnet 11 is fixed to the input shaft 4 and the magnetic yoke assembly 12 is fixed to the output shaft 6, the permanent magnet 11 may be fixed to the output shaft 6 and the magnetic yoke assembly 12 may be fixed to the input shaft 4.
  • a torque sensor wherein the magnetic sensor is arranged on an edge portion of the circuit board, the circuit board has a first main surface on which the first protrusion is arranged and a second main surface opposite the first main surface, and the recess opens to the second main surface and to a side surface of the circuit board corresponding to the edge portion, and does not open to the first main surface.

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  • General Physics & Mathematics (AREA)
  • Power Steering Mechanism (AREA)
PCT/JP2022/045171 2022-12-07 2022-12-07 トルクセンサ Ceased WO2024121997A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2022/045171 WO2024121997A1 (ja) 2022-12-07 2022-12-07 トルクセンサ
JP2024562496A JPWO2024121997A1 (https=) 2022-12-07 2022-12-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011191094A (ja) * 2010-03-12 2011-09-29 Denso Corp センサユニット及び、集磁モジュール
JP2016003984A (ja) * 2014-06-18 2016-01-12 株式会社ジェイテクト トルクセンサおよび電動パワーステアリング装置
US20160214648A1 (en) * 2012-12-13 2016-07-28 Valeo Schalter Und Sensoren Gmbh Device with a torque sensor device and a steering angle sensor device for a motor vehicle, motor vehicle and method for manufacturing a device
CN106405445A (zh) * 2016-10-21 2017-02-15 杭州飞越汽车零部件有限公司 扭矩传感器磁通变化检测结构及其检测方法
JP2017219431A (ja) * 2016-06-08 2017-12-14 日立オートモティブシステムズ株式会社 トルクセンサ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011191094A (ja) * 2010-03-12 2011-09-29 Denso Corp センサユニット及び、集磁モジュール
US20160214648A1 (en) * 2012-12-13 2016-07-28 Valeo Schalter Und Sensoren Gmbh Device with a torque sensor device and a steering angle sensor device for a motor vehicle, motor vehicle and method for manufacturing a device
JP2016003984A (ja) * 2014-06-18 2016-01-12 株式会社ジェイテクト トルクセンサおよび電動パワーステアリング装置
JP2017219431A (ja) * 2016-06-08 2017-12-14 日立オートモティブシステムズ株式会社 トルクセンサ
CN106405445A (zh) * 2016-10-21 2017-02-15 杭州飞越汽车零部件有限公司 扭矩传感器磁通变化检测结构及其检测方法

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