WO2024080153A1 - Machine rotative - Google Patents

Machine rotative Download PDF

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Publication number
WO2024080153A1
WO2024080153A1 PCT/JP2023/035405 JP2023035405W WO2024080153A1 WO 2024080153 A1 WO2024080153 A1 WO 2024080153A1 JP 2023035405 W JP2023035405 W JP 2023035405W WO 2024080153 A1 WO2024080153 A1 WO 2024080153A1
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WO
WIPO (PCT)
Prior art keywords
output shaft
shaft
bearing
arrow
rotor
Prior art date
Application number
PCT/JP2023/035405
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English (en)
Japanese (ja)
Inventor
健太郎 鈴木
裕昭 村上
Original Assignee
ミネベアミツミ株式会社
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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 WO2024080153A1 publication Critical patent/WO2024080153A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears

Definitions

  • the present invention relates to rotating equipment.
  • rotating equipment such as motor drive units used as drive devices for electrically assisted bicycles or electric bicycles
  • the rotation of the rotor is reduced by a reduction gear and transmitted to an output shaft such as a crankshaft.
  • Such rotating equipment is disclosed, for example, in Patent Document 1.
  • Rotating devices equipped with a reducer have multiple components housed within a housing, which means that the design of the component arrangement and external shape is often limited.
  • the present invention provides a rotating device that is equipped with a reducer yet has excellent space-saving properties.
  • the rotating device of the present invention comprises a first output shaft, a cylindrical shaft surrounding the first output shaft, a reducer connected to the shaft, a rotor fixed to the shaft, a stator surrounding the rotor, a housing supporting the stator, and a first bearing, and the first output shaft is connected to the reducer directly or via a member, and the inner periphery of the housing and the outer periphery of the shaft are connected via the first bearing.
  • FIG. 1 is a perspective view showing an external configuration of a rotating device according to an embodiment of the present invention
  • 1 is a cross-sectional view taken along a central axis of a rotating device according to an embodiment of the present invention.
  • FIG. 2 is a partial cross-sectional view showing an example of a reducer.
  • 1 is a cross-sectional perspective view showing a configuration of a rotating device according to an embodiment of the present invention, excluding a reducer.
  • 3 is a cross-sectional view of the rotating device according to the embodiment of the present invention, taken along line AA in FIG. 2;
  • the direction of arrow a along the central axis X in each figure (the direction from the rotor 30 and stator 40 toward the reducer 60) will be referred to as one side, and the opposite direction, the direction of arrow b, will be referred to as the other side.
  • the direction of arrows ab (the longitudinal direction of the first output shaft 10) will be referred to as the axial direction.
  • the directions of arrows cd perpendicular to the axial direction will be referred to as the radial direction
  • the direction of arrow c away from the central axis X will be referred to as the outward direction
  • the direction of arrow d approaching the central axis X will be referred to as the inward direction.
  • FIG. 1 is a perspective view showing the external configuration of the rotating device 1.
  • FIG. 2 is a vertical cross-sectional view obtained by cutting the rotating device 1 on a plane including the central axis X.
  • FIG. 3 is a partial cross-sectional view showing a planetary gear mechanism 160, which is an example of a speed reducer 60.
  • FIG. 4 is a vertical cross-sectional perspective view obtained by cutting the rotating device 1 on a plane including the central axis X after removing the speed reducer 60 so that the manner of connection between the housing 50, the first bearing 71, and the shaft 20 can be easily seen.
  • FIG. 5 is a cross-sectional view taken along line A-A in FIG. 2, showing the configuration of the rotor 30 and the stator 40.
  • the rotating device 1 includes a first output shaft 10, a cylindrical shaft 20 that radially surrounds the first output shaft 10, a rotor 30 fixed to the shaft 20, a stator 40 that radially surrounds the rotor 30, a housing 50 that supports the stator 40, a reducer 60 connected to the shaft 20, a first bearing 71 and a second bearing 72 that support the shaft 20 so that it can rotate relative to the housing 50, a second output shaft 80 connected to the reducer 60, and a one-way clutch 90.
  • one end 11 of the first output shaft 10 and the second output shaft 80 protrude from one end (in the direction of the arrow a) of the housing 50, which is generally cylindrical as a whole.
  • the other end 12 of the first output shaft 10 protrudes from the other end (in the direction of the arrow b) of the housing 50.
  • the first output shaft 10 and the second output shaft 80 are arranged coaxially, and the second output shaft 80 is arranged radially outside the first output shaft 10. Both the first output shaft 10 and the second output shaft 80 are rotatable relative to the housing 50.
  • the detailed configurations of the housing 50, the first output shaft 10, and the second output shaft 80 will be described later.
  • the first output shaft 10 is an axially extending, generally cylindrical member.
  • the first output shaft 10 has an end 11 on one side, an end 12 on the other side, and a thick-walled portion 13 extending axially near the axial center.
  • the inner diameter of the first output shaft 10 is constant over the entire axial direction.
  • the outer diameter of the first output shaft 10 is slightly larger in the thick-walled portion 13 than in other portions.
  • the end on one side (arrow a direction) and the end on the other side (arrow b direction) of the thick-walled portion 13 are transitional portions of thickness, with steps 13a and 13b, respectively.
  • the outer circumferential surfaces of one end 11 and the other end 12 of the first output shaft 10 are formed with teeth 11a and 12a, respectively, which are made up of a plurality of linear recesses extending in the axial direction and a plurality of linear protrusions extending in the axial direction.
  • the rotating device 1 is a motor drive unit of an electrically assisted bicycle
  • the first output shaft 10 is a crankshaft
  • pedals are attached to the teeth 11a and 12a via crank arms.
  • the rotating device 1 is not limited to a motor drive unit of an electrically assisted bicycle, and the teeth 11a and 12a do not have to be formed on the first output shaft 10.
  • the shaft 20 is a generally cylindrical member extending in the axial direction, and is disposed radially outward (in the direction of the arrow c) of the first output shaft 10, surrounding the first output shaft 10.
  • the shaft 20 is disposed coaxially with the first output shaft 10.
  • the shaft 20 surrounds the first output shaft 10 from near the axial center of the thick-walled portion 13 to near the step 13b, which is the end of the thick-walled portion 13 on the other side (in the direction of the arrow b), from the radially outward side (in the direction of the arrow c).
  • the length of the shaft 20 in the axial direction is not limited to this.
  • the shaft 20 does not contact the first output shaft 10, and faces the first output shaft 10 in the radial direction with a small gap therebetween.
  • a protruding portion 23 is provided near the axial center of the shaft 20, protruding in an annular shape radially outward (in the direction of the arrow c).
  • the rotor 30 is fixed to the outer circumferential surface of the shaft 20 on the other axial side (in the direction of the arrow b) of the protruding portion 23.
  • the rotor 30 is positioned by the end of the rotor 30 on one axial side (in the direction of the arrow a) contacting the surface of the protruding portion 23 of the shaft 20 on the other axial side (in the direction of the arrow b).
  • the detailed configuration of the rotor 30 will be described later.
  • a first bearing 71 and a second bearing 72 are arranged on the radial outside of the shaft 20 (in the direction of the arrow c).
  • the first bearing 71 is arranged on one axial side of the rotor 30 (in the direction of the arrow a), and the second bearing 72 is arranged on the other axial side of the rotor 30 (in the direction of the arrow b).
  • the rotor 30 is arranged between the first bearing 71 and the second bearing 72 in the axial direction (the longitudinal direction of the first output shaft 10).
  • the first bearing 71 is a ball bearing having an inner ring 71i, an outer ring 71o, and rolling elements.
  • the second bearing 72 is a ball bearing having an inner ring 72i, an outer ring 72o, and rolling elements. Note that the first bearing 71 and the second bearing 72 are not limited to these configurations, and may be bearings of various other configurations, such as sleeve bearings.
  • the inner ring 71i of the first bearing 71 is press-fitted or bonded to the outer peripheral surface on one axial side (arrow a direction) of the protruding portion 23 of the shaft 20.
  • the inner ring 71i of the first bearing 71 is fixed integrally with the shaft 20.
  • the first bearing 71 is positioned by the end of the inner ring 71i on the other axial side (arrow b direction) contacting the surface on one axial side (arrow a direction) of the protruding portion 23 of the shaft 20.
  • the outer ring 71o of the first bearing 71 is fixed to the inner peripheral surface of the inner peripheral portion 54 of the housing body 51 of the housing 50 described later. Therefore, the first bearing 71 supports the shaft 20 so that it can rotate relative to the housing 50.
  • the inner ring 72i of the second bearing 72 is press-fitted or glued to the outer peripheral surface of the end 22 on the other side (arrow b direction) of the shaft 20. This causes the inner ring 72i of the second bearing 72 to be fixed integrally with the shaft 20.
  • the outer ring 72o of the second bearing 72 is fixed to the lid 53 of the housing 50, which will be described later. Therefore, the second bearing 72, together with the first bearing 71, supports the shaft 20 so that it can rotate relative to the housing 50.
  • the housing 50 is a member that houses the shaft 20, the rotor 30, the stator 40 and the reducer 60 described below, etc., and has a housing body 51, a ring 52, and a lid 53.
  • the housing body 51 is a substantially cylindrical member.
  • An inner circumferential portion 54 that protrudes radially inward (arrow d direction) is provided on the other axial side (arrow b direction) of the reducer 60 in the housing body 51.
  • the inner circumferential portion 54 is shown as a substantially annular member, but the shape of the inner circumferential portion 54 is not limited to this, and may take any shape depending on the shapes of the rotor 30, the stator 40, and the reducer 60.
  • a circular contact portion 54a is provided on the end of the inner periphery 54 of the housing body 51 on the radially inner side (arrow d direction) and one axial side (arrow a direction).
  • the outer periphery of the outer ring 71o of the first bearing 71 is fixed to the inner periphery of the inner periphery 54 of the housing body 51.
  • the first bearing 71 is positioned by the end of the outer ring 71o on one axial side (arrow a direction) contacting the surface of the contact portion 54a of the inner periphery 54 of the housing body 51 on the other axial side (arrow b direction).
  • the ring 52 is connected to the end of the housing body 51 on one axial side (arrow a direction) and is an annular member with a substantially L-shaped cross section centered on the central axis X.
  • the ring 52 has an annular portion 52a, a cylindrical portion 52b extending from the end of the annular portion 52a on the radially inner side (arrow d direction) to one axial side (arrow a direction), and an annular contact portion 52c protruding from the end of the cylindrical portion 52b on the one axial side (arrow a direction) to the radially inner side (arrow d direction).
  • the outer peripheral surface of the outer ring 73o of the third bearing 73 described later is fixed to the inner peripheral surface of the cylindrical portion 52b of the ring 52.
  • the third bearing 73 is positioned by the end of the outer ring 73o on one axial side (arrow a direction) contacting the surface of the contact portion 52c of the ring 52 on the other axial side (arrow b direction).
  • a circular notch 52d is formed at the radially outer end (arrow c direction) of the annular portion 52a of the ring 52, recessed from the other axial side (arrow b direction) to one axial side (arrow a direction).
  • the radial width of notch 52d is the same or approximately the same as the thickness of the end of the housing body 51 on one axial side (arrow a direction).
  • the ring 52 is pressed or glued into the housing body 51 via notch 52d, and thereby the ring 52 is fixed integrally with the housing body 51.
  • the lid 53 is connected to the end of the housing body 51 on the other axial side (arrow b direction), and is an annular member having a generally J-shaped cross section centered on the central axis X.
  • the lid 53 has an annular portion 53a, a connection portion 53b extending from the radially outer end (arrow c direction) of the annular portion 53a to one axial side (arrow a direction), and a tubular portion 53c extending from the radially inner end (arrow d direction) of the annular portion 53a to one axial side (arrow a direction).
  • a circular notch 53d is formed on the radially outer side (arrow c direction) of the end of one axial side (arrow a direction) of connection portion 53b, recessed from one axial side (arrow a direction) to the other axial side (arrow b direction).
  • the radial width of notch 53d is the same or approximately the same as the thickness of the end of housing body 51 on the other axial side (arrow b direction).
  • Lid 53 is pressed or glued into housing body 51 via notch 53d, so that lid 53 is fixed integrally with housing body 51.
  • a cylindrical protrusion 53e that protrudes further toward one axial side (arrow a direction) is provided radially outward (arrow c direction) of the end of one axial side (arrow a direction) of the cylindrical portion 53c of the lid 53.
  • the outer peripheral surface of the outer ring 72o of the second bearing 72 is fixed to the inner peripheral surface of the protrusion 53e.
  • the second bearing 72 is positioned by the end of the outer ring 72o on the other axial side (arrow b direction) contacting the end face of the cylindrical portion 53c of the lid 53 on one axial side (arrow a direction).
  • the end of the cylindrical portion 53c of the cover 53 on the other axial side (arrow b direction) is provided with a ring-shaped contact portion 53f that protrudes radially inward (arrow d direction).
  • a fourth bearing 74 is disposed between the cylindrical portion 53c of the cover 53 and the first output shaft 10 in the radial direction.
  • the fourth bearing 74 is a ball bearing having an inner ring 74i, an outer ring 74o, and a rolling body. Note that the fourth bearing 74 is not limited to this form, and may be other bearings having various other forms, such as a sleeve bearing.
  • the fourth bearing 74 is positioned by the end of the outer ring 74o on the other axial side (arrow b direction) contacting the end face of the contact portion 53f of the cylindrical portion 53c of the cover 53 on one axial side (arrow a direction) and the end of the inner ring 74i on one axial side (arrow a direction) contacting the end face of the step 13b of the first output shaft 10 on the other axial side (arrow b direction).
  • the fourth bearing 74 supports the first output shaft 10 so that it can rotate relative to the lid 53.
  • the stator 40 is supported radially inward (arrow d direction) of the housing body 51 of the housing 50 and on the other axial side (arrow b direction) of the inner periphery 54 so as to face the rotor 30 in the radial direction.
  • the stator 40 is disposed radially outward (arrow c direction) of the rotor 30 and surrounds the rotor 30 from the radial outside (arrow c direction).
  • the stator 40 has a stator core 41 and coils 42.
  • the stator core 41 is a laminate of magnetic material such as silicon steel plate, and has an annular portion 44 arranged coaxially with the first output shaft 10, and a plurality of teeth 43 (18 in FIG. 5) formed to extend from the annular portion 44 toward the first output shaft 10.
  • the coils 42 are wound around each of the plurality of teeth 43.
  • the stator core 41 and the coils 42 are insulated by insulators 45 formed from an insulating material.
  • the rotor 30 has a plurality of first magnets 31, a plurality of second magnets 32, and a rotor core 33.
  • the rotor core 33 is formed by laminating a plurality of magnetic bodies, and has an annular portion 33a and a plurality of (20 in FIG. 5) magnetic pole pieces 33b extending radially from the annular portion 33a via a pair of connecting portions 33c, 33d.
  • a first magnet 31 is disposed between each of the magnetic pole pieces 33b adjacent to each other in the circumferential direction, and a second magnet 32 is disposed between each of the pair of connecting portions 33c, 33d. In the circumferential direction, the first magnet 31 contacts both side surfaces of the two adjacent magnetic pole pieces 33b, and in the radial direction, the second magnet 32 contacts the outer peripheral surface of the annular portion 33a and the inner peripheral surface of the magnetic pole pieces 33b.
  • the magnetic pole of one first magnet 31 on one side surface, the magnetic pole of the other first magnet 31 on the other side surface, and the magnetic pole of the second magnet 32 on the inner peripheral surface of the pole piece 33b all have the same magnetic pole.
  • a magnetic force of a north pole or south pole is applied to each pole piece 33b, and it becomes a single magnetic flux and is emitted radially outward (in the direction of arrow c).
  • the magnetic poles of the pole piece 33b are configured so that north poles and south poles are alternately repeated in the circumferential direction.
  • the rotor 30 rotates due to electromagnetic interaction between the stator 40 and the rotor 30. Because the rotor 30 is fixed to the shaft 20, the rotor 30 and the shaft 20 rotate together.
  • an input section 61 of the reducer 60 is connected to the outer circumferential surface of the end section 21 on one axial side (the direction of the arrow a) of the shaft 20.
  • the reducer 60, the rotor 30, and the stator 40 are arranged side by side in the axial direction (the longitudinal direction of the first output shaft 10).
  • the reducer 60 is shown as a simplified schematic diagram.
  • the reducer 60 has an input section 61 and an output section 62, and is configured so that the rotation at the input section 61 is reduced in the reducer 60 and output from the output section 62.
  • the input section 61 and the output section 62 are each shown as a schematic area surrounded by a dotted line.
  • the reducer 60 may be a reducer using a planetary gear mechanism or another mechanism having gears or pulleys.
  • the arrangement of the input section 61 and output section 62 of the reducer 60 in FIG. 2 is merely exemplary, and the arrangement and configuration of the input section 61 and output section 62 of the reducer 60 may be any as long as the rotation of the shaft 20 is input to the reducer 60 via the input section 61, is slowed down by the reducer 60, and can be transmitted to the second output shaft 80 described below via the output section 62.
  • the reducer 60 may be a planetary gear mechanism 160 shown in FIG. 3.
  • the planetary gear mechanism 160 includes a sun gear 161 (corresponding to the input section 61 of the reducer 60 shown in FIG. 2), a planetary gear 162, an internal gear 163, a first planetary carrier 164 as a first carrier, a second planetary carrier 165 as a second carrier, and a one-way clutch 166 (corresponding to the output section 62 of the reducer 60 shown in FIG. 2).
  • a plurality of planetary gears 162 e.g., four
  • only one planetary gear 162 is shown in FIG. 3.
  • the sun gear 161 is a roughly cylindrical member with teeth formed on its outer circumferential surface.
  • the inner circumferential surface of the sun gear 161 is fixed to the outer circumferential surface of the end 21 on one axial side of the shaft 20, and rotates integrally with the shaft 20.
  • the planetary gear 162 is disposed outside the sun gear 161.
  • the planetary gear 162 meshes with the sun gear 161, and is rotatable around the axis 162A.
  • the internal gear 163 is disposed outside the planetary gear 162.
  • the internal gear 163 meshes with the planetary gear 162.
  • the internal gear 163 is a roughly cylindrical member with teeth formed on its inner circumferential surface.
  • the outer circumferential surface of the internal gear 163 is fixed to the inner circumferential surface of the housing main body 51.
  • a first planetary carrier 164 and a second planetary carrier 165 are disposed on one side and the other side of the planetary gear 162 in the axial direction, respectively.
  • a bearing 162B1 and a bearing 162B2 are disposed on one side and the other side of the end of the shaft 162A of the planetary gear 162 in the axial direction, respectively.
  • the bearings 162B1 and the bearings 162B2 are, for example, ball bearings.
  • the shaft 162A of the planetary gear 162 is connected to the first planetary carrier 164 via the bearing 162B1, and is connected to the second planetary carrier 165 via the bearing 162B2.
  • a bearing 164B is disposed radially inside the first planetary carrier 164.
  • the bearing 164B is, for example, a ball bearing.
  • the first planetary carrier 164 is connected to the first output shaft 10 via the bearing 164B and is rotatable relative to the first output shaft 10.
  • a one-way clutch 166 is disposed radially outside the first planetary carrier 164.
  • the first planetary carrier 164 is connected to the second output shaft 80 via the one-way clutch 166.
  • a bearing 165B is disposed on the outside of the second planetary carrier 165.
  • the bearing 165B is, for example, a ball bearing.
  • the second planetary carrier 165 is connected to the inner periphery 54 of the housing main body 51 via the bearing 165B, and is rotatable relative to the housing 50.
  • the sun gear 161 (input section 61) rotates integrally with the shaft 20
  • the planetary gear 162 meshing with the sun gear 161 rotates (spins) around the shaft 162A.
  • the planetary gear 162 meshes with the internal gear 163, which is a fixed gear, it rotates (revolves) around the first output shaft 10 as well as spinning around its axis.
  • the first planetary carrier 164 and the second planetary carrier 165 which are connected to the shaft 162A and the bearing 162B1 via the bearings 162B1 and 162B2, rotate around the first output shaft 10.
  • the rotation of the first planetary carrier 164 is output to the second output shaft 80 via the one-way clutch 166 (output section 62).
  • the reduction gear 60 is the planetary gear mechanism 160 shown in FIG. 3, the rotation of the shaft 20 is input to the reduction gear 60 by the above-mentioned mechanism, is reduced by the reduction gear 60, and is then transmitted to the second output shaft 80.
  • the reduction gear 60 is not limited to the planetary gear mechanism 160, and may have any other configuration as long as the rotation of the shaft 20 is input to the reduction gear 60 via the input portion 61, is reduced by the reduction gear 60, and can be transmitted to the second output shaft 80 described later via the output portion 62.
  • the second output shaft 80 is connected to the output section 62 of the reduction gear 60. In the radial direction, the second output shaft 80 is disposed outside the first output shaft 10 (in the direction of the arrow c).
  • the second output shaft 80 has a substantially cylindrical tubular section 81 disposed coaxially with the first output shaft 10, an annular section 82 extending from the end of the axial other side (in the direction of the arrow b) of the tubular section 81 to the radial outside (in the direction of the arrow c), an annular contact section 83 protruding from the end of the axial one side (in the direction of the arrow a) of the tubular section 81 to the radial inside (in the direction of the arrow d), and an annular protruding section 84 protruding from the end of the radial outside (in the direction of the arrow c) of the annular section 82 to the axial other side (in the direction of the arrow b).
  • a chain ring is fixed to the outer circumferential surface of the end of the axial one side (in the direction of the arrow a) of the tubular section 81 of the second output shaft 80.
  • the second output shaft 80 itself may be configured as a chain ring.
  • a third bearing 73 is fixed to the outer peripheral surface of the cylindrical portion 81 of the second output shaft 80 near the end on the other axial side (arrow b direction).
  • the third bearing 73 is a ball bearing having an inner ring 73i, an outer ring 73o, and rolling elements. Note that the third bearing 73 is not limited to this form, and may be other bearings of various forms, such as a sleeve bearing.
  • the inner peripheral surface of the inner ring 73i of the third bearing 73 is fixed to the outer peripheral surface of the cylindrical portion 81 of the second output shaft 80 by press-fitting or adhesive.
  • the outer peripheral surface of the outer ring 73o of the third bearing 73 is fixed to the inner peripheral surface of the cylindrical portion 52b of the ring 52 of the housing 50. Therefore, the third bearing 73 supports the second output shaft 80 so that it can rotate relative to the housing 50.
  • a first one-way clutch 91 and a second one-way clutch 92 are arranged in series in the axial direction between the cylindrical portion 81 of the second output shaft 80 and the first output shaft 10.
  • the second one-way clutch 92 may not be present and only the first one-way clutch 91 may be arranged.
  • the first one-way clutch 91 and the second one-way clutch 92 will be collectively referred to simply as the one-way clutch 90.
  • the inner peripheral surface of the one-way clutch 90 is fixed to the outer peripheral surface of the first output shaft 10.
  • the outer peripheral surface of the one-way clutch 90 is also fixed to the inner peripheral surface of the cylindrical portion 81 of the second output shaft 80.
  • the one-way clutch 90 is positioned by its end on the other axial side (arrow b direction) contacting the end face on one axial side (arrow a direction) of the step 13a of the first output shaft 10, and by its end on one axial side (arrow a direction) contacting the face on the other axial side (arrow b direction) of the contact portion 83 of the second output shaft 80.
  • the protruding portion 84 of the second output shaft 80 is connected to the output portion 62 of the reduction gear 60. Therefore, the first output shaft 10 is indirectly connected to the reduction gear 60 via members (the one-way clutch 90 and the second output shaft 80).
  • the one-way clutch 90 is configured to transmit the rotation of the first output shaft 10 relative to the second output shaft 80 in one direction and not transmit the rotation in the other direction.
  • the rotating device 1 In the rotating device 1 according to this embodiment, the first output shaft 10, shaft 20, rotor 30, stator 40, reducer 60, and second output shaft 80 are all arranged coaxially. In addition, in the rotating device 1, the inner periphery 54 of the housing 50 and the outer periphery of the shaft 20 are connected via the first bearing 71. With this configuration, the rotating device 1 can be made smaller and has excellent space-saving properties than conventional rotating devices, such as rotating devices in which the reducer is not arranged coaxially with the rotor and stator and therefore additional space is required to accommodate the reducer, or rotating devices in which the inner periphery of the housing is connected to the inner periphery of the shaft and therefore additional space is provided between the shaft and the output shaft.
  • conventional rotating devices such as rotating devices in which the reducer is not arranged coaxially with the rotor and stator and therefore additional space is required to accommodate the reducer, or rotating devices in which the inner periphery of the housing is connected to the inner periphery of the shaft and therefore
  • the rotating device of the present invention has been described above with reference to preferred embodiments, but the rotating device of the present invention is not limited to the configuration of the above embodiments.
  • the rotating device 1 according to the above embodiments is described on the assumption that it is used as a motor drive unit for an electrically assisted bicycle or an electric bicycle, but the rotating device of the present invention is not limited to being used as a motor drive unit for an electrically assisted bicycle or an electric bicycle.
  • the first output shaft 10 is a generally cylindrical member, but in the rotating device of the present invention, the first output shaft may be a solid member. Also, in the rotating device 1 according to the above embodiment, the first output shaft 10 has a thick-walled portion 13, but in the rotating device of the present invention, the first output shaft does not have to have a thick-walled portion.
  • a protrusion 23 that protrudes outward in the radial direction (in the direction of the arrow c) is provided in the axial center of the shaft 20 in an annular shape, but the axial position of the protrusion 23 may be changed as desired depending on the arrangement of the first bearing 71, the rotor 30, etc.
  • the shaft does not necessarily have to be provided with a protrusion.
  • the shaft 20 and the housing 50 are connected via two bearings (first bearing 71 and second bearing 72), but in the rotating device of the present invention, the number of bearings connecting the shaft and the housing may be one, or may be three or more.
  • the configuration of the rotor and stator is not limited to the configuration of the rotor 30 and stator 40 in the rotating device 1 according to the above embodiment, and may have any configuration as long as the shaft is rotatable relative to the housing.
  • the rotor does not need to have a second magnet.
  • the number of teeth of the stator and the number of pole pieces of the rotor may be changed as desired.
  • the rotor may be a cylindrical magnet with different magnetic poles (south and north poles) magnetized alternately in the circumferential direction.
  • the inner circumference 54 of the housing body 51 has a contact portion 54a
  • the ring 52 has a contact portion 52c
  • the lid 53 has a protrusion 53e and a contact portion 53f
  • the second output shaft 80 has a contact portion 83.
  • these are for positioning the bearings and one-way clutch, they do not have to be present when positioning is not required or when positioning can be achieved by other means.
  • the housing 50 has multiple components consisting of the housing body 51, the ring 52, and the lid 53, but in the rotating device of the present invention, the housing may be molded as a single unit.
  • the first output shaft 10 is indirectly connected to the reducer 60 via the one-way clutch 90 and the second output shaft 80, but the rotating device of the present invention may not have a one-way clutch and a second output shaft, and the first output shaft may be directly connected to the reducer, depending on the application.
  • 1...rotating device 10...first output shaft, 20...shaft, 30...rotor, 40...stator, 50...housing, 54...inner circumference, 60...reduction gear, 71...first bearing, 72...second bearing, 80...second output shaft, 90...one-way clutch.

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  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

Est prévue une machine rotative ayant des propriétés d'économie d'espace exceptionnelles bien qu'étant dotée d'un réducteur.　Cette machine rotative (1) comprend un premier arbre de sortie (10), un arbre cylindrique (20) entourant le premier arbre de sortie (10), un réducteur (60) relié à l'arbre (20), un rotor (30) fixé à l'arbre (20), un stator (40) entourant le rotor (30), un boîtier (50) supportant le stator (40), et un premier palier (71), le premier arbre de sortie (10) étant relié au réducteur (60) soit directement soit par l'intermédiaire d'un élément, et la surface périphérique externe de l'arbre (20) et une partie périphérique interne (54) du boîtier (50) étant reliées par l'intermédiaire du premier palier (71).
PCT/JP2023/035405 2022-10-14 2023-09-28 Machine rotative WO2024080153A1 (fr)

Applications Claiming Priority (2)

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JP2022165723 2022-10-14
JP2022-165723 2022-10-14

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WO2024080153A1 true WO2024080153A1 (fr) 2024-04-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019213254A (ja) * 2018-05-31 2019-12-12 日本電産シンポ株式会社 駆動装置およびそれを備える車両
WO2020067259A1 (fr) * 2018-09-28 2020-04-02 日本電産株式会社 Dispositif d'entraînement
WO2020149412A1 (fr) * 2019-01-17 2020-07-23 アイシン・エィ・ダブリュ株式会社 Dispositif d'entraînement de véhicule
JP2021148245A (ja) * 2020-03-19 2021-09-27 本田技研工業株式会社 駆動ユニットのオイル回収機構

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019213254A (ja) * 2018-05-31 2019-12-12 日本電産シンポ株式会社 駆動装置およびそれを備える車両
WO2020067259A1 (fr) * 2018-09-28 2020-04-02 日本電産株式会社 Dispositif d'entraînement
WO2020149412A1 (fr) * 2019-01-17 2020-07-23 アイシン・エィ・ダブリュ株式会社 Dispositif d'entraînement de véhicule
JP2021148245A (ja) * 2020-03-19 2021-09-27 本田技研工業株式会社 駆動ユニットのオイル回収機構

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