WO2023248764A1 - Machine tournante, et dispositif de détection - Google Patents

Machine tournante, et dispositif de détection Download PDF

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Publication number
WO2023248764A1
WO2023248764A1 PCT/JP2023/020629 JP2023020629W WO2023248764A1 WO 2023248764 A1 WO2023248764 A1 WO 2023248764A1 JP 2023020629 W JP2023020629 W JP 2023020629W WO 2023248764 A1 WO2023248764 A1 WO 2023248764A1
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WO
WIPO (PCT)
Prior art keywords
shaft
case member
case
detection
arrow
Prior art date
Application number
PCT/JP2023/020629
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English (en)
Japanese (ja)
Inventor
裕昭 村上
幸嗣 癸生川
健太郎 鈴木
Original Assignee
ミネベアミツミ株式会社
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Filing date
Publication date
Application filed by ミネベアミツミ株式会社 filed Critical ミネベアミツミ株式会社
Publication of WO2023248764A1 publication Critical patent/WO2023248764A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers

Definitions

  • the present invention relates to rotating equipment and detection devices.
  • magnetostrictive rotating devices or detecting devices are known as rotating devices or detecting devices that can detect the force applied to a shaft.
  • a strain detection device has been proposed that includes a magnetic layer fixed on the outer circumferential surface of a shaft and a detection coil that detects changes in magnetic permeability of the magnetic layer (see, for example, Patent Document 1).
  • An example of the present invention is to reduce the size of a rotating device or a detection device.
  • a rotating device or a detection device includes a case, a shaft rotatably supported with respect to the case, and a detection section disposed on an outer surface or an inner surface of the case, and the case includes , a first case member, a second case member, and a connecting part that connects the first case member and the second case member, and the detecting part is arranged between the shaft and the connecting part. Placed.
  • FIG. 1 is a perspective view of a rotating device (detection device) according to an embodiment that is an example of the present invention. It is another perspective view of the rotating device (detection device) concerning embodiment which is an example of the present invention.
  • FIG. 1 is a side view of a rotating device (detection device) according to an embodiment that is an example of the present invention.
  • FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3 of a rotating device (detection device) according to an embodiment that is an example of the present invention.
  • 1 is a diagram showing an example of a usage state of a rotating device (detection device) according to an embodiment that is an example of the present invention.
  • the direction of arrow a along the central axis (axis do.
  • the direction along the axis X that is, the direction of the arrow ab is referred to as the axial direction.
  • the direction of arrow cd in FIG. 4 that is, the direction perpendicular to the axial direction, is called the radial direction
  • the direction of arrow c moving away from axis X is called the outside or one radial side
  • the direction of arrow e (the front side of the electrically assisted bicycle 2 in FIG. 5) is referred to as the traveling direction side
  • the direction of the arrow f (the rear side of the electrically assisted bicycle 2 in FIG. 5) is referred to as the backward direction side
  • the direction of the arrow g along the direction of gravity is referred to as the upper side in the direction of gravity
  • the direction of the arrow h along the direction of gravity is referred to as the lower side in the direction of gravity.
  • FIG. 1 is a perspective view showing the overall configuration of a rotating device 1 viewed from one side.
  • FIG. 2 is a perspective view showing the overall configuration of the rotating device 1 viewed from the other side.
  • FIG. 3 is a side view showing the configuration of one side of the rotating device 1.
  • FIG. 4 is a sectional view showing the configuration of the rotating device 1 taken along the line AA in FIG. 3.
  • FIG. 5 is a diagram showing an example of a usage state of the rotating device 1, in which the drive unit 3 including the rotating device 1 is attached to the electrically assisted bicycle 2.
  • FIG. 1 is a perspective view showing the overall configuration of a rotating device 1 viewed from one side.
  • FIG. 2 is a perspective view showing the overall configuration of the rotating device 1 viewed from the other side.
  • FIG. 3 is a side view showing the configuration of one side of the rotating device 1.
  • FIG. 4 is a sectional view showing the configuration of the rotating device 1 taken along the line AA in FIG. 3.
  • FIG. 5 is a diagram showing
  • the rotating device 1 includes a case 10, a shaft 20, and a detection section 50 (see FIG. 4).
  • the case 10 includes a first case member 11, a second case member 12, and a connecting portion 13 that connects the first case member 11 and the second case member 12.
  • the second case member 12 is an egg-shaped cup-shaped member when viewed from the other axial side (arrow b direction), and is open on one axial side (arrow a direction).
  • the first case member 11 is an egg-shaped flat member when viewed from one side in the axial direction (direction of arrow a), and functions as a lid that closes the opening of the second case member 12 from one side in the axial direction.
  • the shapes of the first case member 11 and the second case member 12 are not limited to an oval shape when viewed from one axial side (direction of arrow a) and the other side of the axis (direction of arrow b), but may be any shape. It's good to be there.
  • the case 10 (first case member 11 and second case member 12) is made of aluminum, magnesium, titanium, or an alloy containing at least one of these metals. Since these metals have a relatively high internal loss (tan ⁇ ), vibrations in the case 10 can be damped relatively quickly.
  • the detection unit 50 described later can attenuate vibrations that occur simultaneously with the strain of the case 10 and vibrations that become noise when detecting the strain of the case 10 relatively quickly. , strain can be detected with high precision.
  • the first case member 11 and the second case member 12 may be formed of other metals, resins, or the like.
  • the first case member 11 and the second case member 12 may be formed of the same material, or may be formed of mutually different materials.
  • the first case member 11 has a wall portion 11c that protrudes toward the other side in the axial direction (in the direction of arrow b) and extends around the edge of the first case member 11. is formed.
  • the end portion of the wall portion 11c on the other axial direction (arrow b direction) is connected to the axial direction one side (arrow a direction).
  • the motor accommodating portion 12m As shown in FIG. 2, at the end of the second case member 12 on the other side in the axial direction (direction of arrow b), there is a cup-shaped motor accommodating portion 12m that is approximately circular when viewed from the other side in the axial direction (direction of arrow b). is provided.
  • the motor accommodating portion 12m is disposed on the traveling direction side (arrow e direction) than a through hole 12t, which will be described later, and protrudes toward the other axial side (arrow b direction).
  • the motor accommodating portion 12m is a portion that accommodates a motor (not shown) arranged inside the case 10.
  • the outside of the second case member 12 includes a lower side in the direction of gravity (direction of arrow h) on the backward direction side (direction of arrow f), an upper side in the direction of gravity (direction of arrow g), and an upper side in the direction of gravity (direction of arrow g).
  • Flange portions 12a to 12f are provided to protrude.
  • the case 10 is fixed to the electrically assisted bicycle 2 via the flanges 12a to 12f.
  • the positions, numbers, and shapes of the flange portions 12a to 12f are not limited thereto, and may be any position, number, and shape as long as they can be fixed to the electrically assisted bicycle 2.
  • the means for fixing the case 10 to the electrically assisted bicycle 2 does not have to be via the flanges 12a to 12f.
  • each connecting portion 13 is a bolt, but is not limited to this.
  • each connecting portion 13 has a through hole 11h that passes through the first case member 11 in the axial direction (direction of arrow ab) and a through hole 11h that passes through the first case member 11 in the axial direction (direction of arrow a).
  • the first case member 11 and the second case member 12 are fixed via a bottomed hole 12h formed toward the other axial side (direction of arrow b) with respect to the end surface.
  • a circular through hole 11t is formed near the center of the first case member 11 in the direction of gravity (direction of arrow f) and in the direction of gravity. Further, at the other end of the second case member 12 in the axial direction (direction of arrow b), on the retreating direction side (direction of arrow f) and near the center in the direction of gravity, there is a circular through hole with a diameter larger than that of the through hole 11t. A hole 12t is formed. As shown in FIG. 4, the through hole 11t and the through hole 12t are in communication, and the shaft 20 passes through the case 10 via the through hole 11t and the through hole 12t.
  • An end 21 (FIG. 4) on one axial side (direction of arrow a) of the shaft 20 projects to the outside of the case 10 (one axial side) through the through hole 11t of the first case member 11.
  • An end 22 of the shaft 20 on the other axial side (direction of arrow b) projects to the outside of the case 10 (on the other axial side) through the through hole 12t of the second case member 12.
  • the first case member 11 is provided with a cylindrical protrusion 11d that protrudes toward the other axial side (in the direction of arrow b) on the radially outer side (one radial side) of the through hole 11t. It is being The first bearing 60 is arranged on the radially inner side (the other radial side) of the protrusion 11d.
  • the first bearing 60 is a ball bearing having an inner ring 61, an outer ring 62, and rolling elements.
  • the first bearing 60 is not limited to a ball bearing, and may be various other bearings such as a sleeve bearing.
  • the outer ring 62 of the first bearing 60 is inserted inside the protrusion 11d in the radial direction.
  • the inner ring 61 of the first bearing 60 is bonded or press-fitted to the outer circumferential surface (radially outer surface) of the shaft 20. Thereby, the inner ring 61 of the first bearing 60 is fixed to the shaft 20 and rotates together with the shaft 20.
  • an output gear 80 is arranged near the end 22 of the shaft 20 on the other axial side (in the direction of arrow b).
  • the output gear 80 is a gear that transmits rotation of a motor (not shown) to the shaft 20.
  • the output gear 80 includes a gear portion 81, a substantially cylindrical boss portion 82 that is provided coaxially with the gear portion 81, has a smaller diameter than the gear portion 81, and projects toward the other side in the axial direction (in the direction of arrow b), and a gear portion 82.
  • This member includes an annular connecting portion 83 that connects the portion 81 and the boss portion 82 .
  • the output gear 80 is bonded or press-fitted to the outer circumferential surface (radially outer surface) of the shaft 20. Thereby, the output gear 80 is fixed to the shaft 20 and rotates together with the shaft 20.
  • the second bearing 70 is arranged outside the connecting portion 83 of the output gear 80 in the radial direction.
  • the second bearing 70 has a larger diameter than the first bearing 60.
  • the second bearing 70 is a ball bearing having an inner ring 71, an outer ring 72, and rolling elements.
  • the second bearing 70 is not limited to a ball bearing, and may be various other bearings such as a sleeve bearing.
  • the inner ring 71 of the second bearing 70 is bonded or press-fitted to the outer circumferential surface (radially outer surface) of the connecting portion 83 of the output gear 80. Thereby, the inner ring 71 of the second bearing 70 is fixed to the output gear 80 and rotates together with the shaft 20 and the output gear 80.
  • the outer ring 72 of the second bearing 70 is fixed to the second case member 12 of the case 10 from the outside in the radial direction and the other side in the axial direction (in the direction of arrow b). With the above configuration, the shaft 20 is rotatably supported with respect to the case 10.
  • the shaft 20 is arranged between the first connecting portion 13a and the second connecting portion 13b of the connecting portion 13.
  • the first connecting part 13a, the second connecting part 13b, and the shaft 20 are arranged in a straight line in the direction of gravity in the order of the first connecting part 13a, the shaft 20, and the second connecting part 13b from the upper side in the direction of gravity.
  • the distance between the shaft 20 and the first connecting portion 13a (X1+Y1 in FIG. 3) is equal to the distance between the shaft 20 and the second connecting portion 13b (X2+Y2 in FIG. 3).
  • the distance between the shaft 20 and the first connecting portion 13a may be different from the distance between the shaft 20 and the second connecting portion 13b.
  • the first case member 11 of the case 10 has an outer surface 11a that is a surface on one side in the axial direction (direction of arrow a) and an inner surface 11b that is a surface on the other side in the axial direction (direction of arrow b). has.
  • a detection unit 50 for detecting stress is arranged on the outer surface 11a of the first case member 11.
  • the detection unit 50 may be arranged on the inner surface 11b of the first case member 11.
  • the detection section 50 is composed of a plurality of (two in this embodiment) detection sections including a first detection section 51 and a second detection section 52.
  • the detection section 50 is arranged between the shaft 20 and the connecting section 13.
  • the first detection section 51 is arranged in the region between the shaft 20 and the first connection section 13a
  • the second detection section 52 is arranged in the region between the shaft 20 and the second connection section 13b. located in the area.
  • the first detection section 51, and the second detection section 52 are arranged on a straight line connecting the first connection section 13a and the second connection section 13b.
  • the distance between the shaft 20 and the detection section 50 is larger than the distance between the connection section 13 and the detection section 50 when viewed from the axial direction.
  • the distance between the shaft 20 and the first detection unit 51 (distance Y1 between the center of the shaft 20 and the center of the first strain sensor 31 in FIG. 3) is It is larger than the distance between the first connecting part 13a and the first detecting part 51 (distance X1 between the center of the first connecting part 13a and the center of the first strain sensor 31 in FIG. 3).
  • the distance between the shaft 20 and the second detection section 52 (the distance Y2 between the center of the shaft 20 and the center of the second strain sensor 32 in FIG. 3) is the distance between the second connection section 13b and the second detection section 52. portion 52 (distance X2 between the center of the second connecting portion 13b and the center of the second strain sensor 32 in FIG. 3).
  • the distance Y1 between the shaft 20 and the first detection section 51 is equal to the distance Y2 between the shaft 20 and the second detection section 52 when viewed from the axial direction.
  • the distance Y1 between the shaft 20 and the first detection section 51 may be different from the distance Y2 between the shaft 20 and the second detection section 52.
  • the first detection unit 51 includes a first strain sensor 31 attached to the outer surface 11a of the first case member 11, and a first strain sensor 31 attached to the outer surface 11a of the first case member 11. (first deformed portion 41).
  • the second detection unit 52 includes a second strain sensor 32 attached to the outer surface 11a of the first case member 11, and a portion of the outer surface 11a of the first case member 11 to which the second strain sensor 32 is attached (a portion of the outer surface 11a of the first case member 11). 2 deformation section 42).
  • the first deformable portion 41 and the second deformable portion 42 are capable of elastic deformation or plastic deformation. Further, the first deformable portion 41 and the second deformable portion 42 may be formed of a material (such as a shape memory material) that can be restored to the shape before deformation under certain conditions after being deformed.
  • the entire first case member 11 including the first deformable portion 41 and the second deformable portion 42 may be integrally formed of the same material, and the first deformable portion 41 and the second deformable portion 42 are The other parts of the case member 11 may be made of a different material. Note that the first deformable portion 41 and the second deformable portion 42 only need to be capable of elastic deformation or plastic deformation, and do not need to be more easily deformed than other parts of the first case member 11. do not have.
  • the area between the shaft 20 and the connecting part 13 (the first deformed part 41 and the second deformed part 42, and the periphery of the first deformed part 41 and the second deformed part 42) (including the area) is not provided with ribs, recesses, protrusions, etc., and is formed as a smooth surface.
  • the smooth surface is bent in the axial direction (in the direction of the arrow AB) by the stress applied to the first case member 11, and becomes a deformable surface (vibration surface) that can be deformed into an uneven shape.
  • the first strain sensor 31 and the second strain sensor 32 are sensors that detect strain in the first deformable portion 41 and the second deformable portion 42, respectively.
  • the first strain sensor 31 and the second strain sensor 32 are strain gauges.
  • the first strain sensor 31 and the second strain sensor 32 have a grid (gauge) whose orientation (typically, the longitudinal direction of the strain gauge) is It is attached to the outer surface 11a of the first case member 11 along a straight line connecting the first detection section 51 and the second detection section 52 (along the direction of gravity).
  • first strain sensor 31 and the second strain sensor 32 are strain gauges
  • the strain in the first deformable portion 41 and the second deformable portion 42 is detected as a change in resistance value.
  • first strain sensor 31 and the second strain sensor 32 are not limited to strain gauges, and may be various other sensors such as piezoelectric elements.
  • the shaft 20 is a crankshaft of the electrically assisted bicycle 2.
  • a pedal (not shown) attached to an end 21 on one axial side (in the direction of arrow a) of the shaft 20 is stepped on, the end on one axial side (in the direction of arrow a) of the shaft 20 moves downward in the direction of gravity. Try to lean to the side.
  • the opposite end 22 of the shaft 20 on the other axial side (direction of arrow b) tends to tilt upward in the direction of gravity (direction of arrow g).
  • the shaft 20 presses the first bearing 60 in the radial direction (downward in the direction of gravity (direction of arrow h) or upward in the direction of gravity (direction of arrow g)), so that the first bearing 60 Stress is generated in the inserted first case member 11 in accordance with the force with which the pedal is depressed (pedal force).
  • the first case member 11 is fixed to the second case member by the first connecting part 13a and the second connecting part 13b, and the first connecting part 13a, the second connecting part 13b and the shaft 20 are connected in the direction of gravity. Since the shafts 20 and 20 are arranged in a straight line, the stress exerted on the first case member 11 by the shaft 20 is concentrated on the straight line connecting the first connecting part 13a, the shaft 20, and the second connecting part 13b.
  • the first deformable portion 41 and the second deformable portion 42 are arranged on a straight line connecting the first connecting portion 13a, the shaft 20, and the second connecting portion 13b, and the first deformable portion 41 and the second deformable portion 42 have a second deformable portion, respectively. Since the first strain sensor 31 and the second strain sensor 32 are attached, the first strain sensor 31 and the second strain sensor 32 can detect stress as strain.
  • the force with which the pedal is pressed is calculated based on the stress detected by the first strain sensor 31 and the second strain sensor 32.
  • the output of the motor (not shown) of the electrically assisted bicycle 2 can be adjusted according to the calculated pedal effort. If the calculated pedal force value is smaller than a predetermined reference threshold, it is considered that the situation does not require much assistance, and the output of the motor is reduced. On the other hand, if the calculated pedal force value is larger than the predetermined threshold, it is considered that the situation requires greater assistance, so the output of the motor is increased. Since the rotating device 1 according to the present embodiment has a simple structure in which the detection unit 50 is placed directly on the case 10, it can be made smaller as a whole.
  • the distances Y1, Y2 between the shaft 20 and the detecting section 50 are larger than the distances X1, X2 between the connecting section 13 and the detecting section 50. That is, the detection section 50 is arranged at a position closer to the coupling section 13 than the shaft 20.
  • the first case member 11 It is possible to accurately detect the stress generated in the Therefore, in the rotating device 1 according to the present embodiment, the pedal force can be calculated accurately.
  • the rotating equipment and detection device of the present invention have been described above with reference to preferred embodiments, the rotating equipment and detection device of the present invention are not limited to the configurations of the above embodiments.
  • the rotating device 1 according to the above embodiment is used for a power-assisted bicycle, but the rotating device and detection device of the present invention are not limited to those used for a power-assisted bicycle. It can be applied to any device that needs to detect stress applied to a freely supported shaft.
  • the detection section 50 is arranged on the outer surface 11a of the first case member 11.
  • the detection section may be arranged on the inner surface of the first case member.
  • the strain sensor and the wiring can be housed within the case, resulting in a more durable configuration.
  • the detection section 50 is composed of two detection sections including a first detection section 51 and a second detection section 52.
  • the number of detection sections may be one, or three or more.
  • the second detecting section 52 may not exist and only the first detecting section 51 may exist.
  • the first detection section 51 may not exist, and only the second detection section 52 may exist.
  • an additional detection section may be provided on the second case member of the case.
  • the connecting portion 13 and the shaft 20 are arranged side by side in the direction of gravity.
  • the connecting portion and the shaft may be arranged side by side in a direction inclined from the direction of gravity.
  • the degree of inclination may be, for example, 30° or less, 20° or less, 10° or less, or 5° or less.
  • the shaft 20, the first detection section 51, and the second detection section 52 are arranged on the straight line connecting the first connection section 13a and the second connection section 13b.
  • the connecting portion, the shaft, and the detection portion do not necessarily have to be arranged in a strictly linear manner.
  • the detection part may be arranged slightly shifted toward the advancing direction or the retreating direction from a straight line connecting the connecting part and the shaft.
  • SYMBOLS 1 Rotating device (detection device), 10... Case, 11... First case member, 11a... Outer surface, 11b... Inner surface, 12... Second case member, 13... Connection part, 13a... First connection part, 13b ...Second connection part, 20...Shaft, 50...Detection part, 51...First detection part, 52...Second detection part.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

Selon l'invention, un machine tournante ou un dispositif de détection est miniaturisé.　Plus précisément, l'invention concerne une machine tournante (dispositif de détection) (1) qui possède : un boîtier (10) ; un arbre (20) supporté de manière à permettre sa rotation vis-à-vis du boîtier (10) ; et une partie détection (50) disposée sur une surface externe (11a) ou une surface interne (11b) du boîtier (10). Le boîtier (10) est équipé d'un premier élément boîtier (11), d'un second élément boîtier (12), et d'une partie couplage (13) couplant le premier élément boîtier (11) et le second élément boîtier (12). La partie détection (50) est disposée entre l'arbre (20) et la partie couplage (13).
PCT/JP2023/020629 2022-06-24 2023-06-02 Machine tournante, et dispositif de détection WO2023248764A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-101793 2022-06-24
JP2022101793A JP2024002545A (ja) 2022-06-24 2022-06-24 回転機器および検出装置

Publications (1)

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WO2023248764A1 true WO2023248764A1 (fr) 2023-12-28

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TW (1) TW202401960A (fr)
WO (1) WO2023248764A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016078811A (ja) * 2014-10-21 2016-05-16 ウーシー アイメイケ パワー マシーナリー カンパニー リミテッドＷｕｘｉ Ａｉｍｅｉｋｅ Ｐｏｗｅｒ Ｍａｃｈｉｎｅｒｙ Ｃｏｍｐａｎｙ Ｌｉｍｉｔｅｄ． 電動車両におけるミッドシップ式モータ駆動システム
WO2020184472A1 (fr) * 2019-03-13 2020-09-17 本田技研工業株式会社 Dispositif d'assistance électrique, et bicyclette
US20220161666A1 (en) * 2019-04-17 2022-05-26 Mavic Sas Force measurement sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016078811A (ja) * 2014-10-21 2016-05-16 ウーシー アイメイケ パワー マシーナリー カンパニー リミテッドＷｕｘｉ Ａｉｍｅｉｋｅ Ｐｏｗｅｒ Ｍａｃｈｉｎｅｒｙ Ｃｏｍｐａｎｙ Ｌｉｍｉｔｅｄ． 電動車両におけるミッドシップ式モータ駆動システム
WO2020184472A1 (fr) * 2019-03-13 2020-09-17 本田技研工業株式会社 Dispositif d'assistance électrique, et bicyclette
US20220161666A1 (en) * 2019-04-17 2022-05-26 Mavic Sas Force measurement sensor

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JP2024002545A (ja) 2024-01-11

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