WO2020195396A1 - Motor - Google Patents

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Publication number
WO2020195396A1
WO2020195396A1 PCT/JP2020/006703 JP2020006703W WO2020195396A1 WO 2020195396 A1 WO2020195396 A1 WO 2020195396A1 JP 2020006703 W JP2020006703 W JP 2020006703W WO 2020195396 A1 WO2020195396 A1 WO 2020195396A1
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WO
WIPO (PCT)
Prior art keywords
resin
bearing
holder
embedded
motor according
Prior art date
Application number
PCT/JP2020/006703
Other languages
French (fr)
Japanese (ja)
Inventor
尚 石田
梅田　智之
裕也 齋藤
藤原　英雄
Original Assignee
日本電産株式会社
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 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN202080014512.7A priority Critical patent/CN113424413A/en
Publication of WO2020195396A1 publication Critical patent/WO2020195396A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations

Definitions

  • the present invention relates to a motor.
  • Patent Document 1 discloses a bus bar unit including a bus bar holder in which a bus bar is embedded. In addition to the busbar holder, such a motor has a metal bearing holder that rotatably supports the shaft via a bearing.
  • one of the objects of the present invention is to simplify the assembly process of the motor by the bearing holder having the function of the bus bar holder.
  • One aspect of the motor of the present invention is a rotor that rotates around a central axis, a stator that faces the rotor in the radial direction, a housing that is made of resin and in which the stator is embedded, and the rotor that rotates with respect to the stator. It has a bearing that can support it and a bearing holder that holds the bearing.
  • the bearing holder has a resin portion made of resin and holding the bearing, and a bus bar electrically connected to the coil of the stator.
  • the bus bar is embedded in the resin portion.
  • the assembly process of the motor can be simplified by the bearing holder having the function of the bus bar holder.
  • FIG. 1 is a cross-sectional view of the motor of one embodiment.
  • FIG. 2 is a cross-sectional view of the lower bearing holder of one embodiment.
  • FIG. 3 is a cross-sectional view of the lower bearing holder of one embodiment after additional machining.
  • FIG. 4 is a partial cross-sectional view of the lower bearing holder of the modified example 1.
  • FIG. 5 is a partial cross-sectional view of the lower bearing holder of the modified example 2.
  • the direction parallel to the central axis J is simply referred to as “axial direction” or “vertical direction”, and the radial direction centered on the central axis J is simply referred to as “radial direction”.
  • the circumferential direction around the axis J that is, the circumference of the central axis J is simply referred to as the "circumferential direction”.
  • one side in the axial direction along the central axis J is simply referred to as “upper side”
  • the other side is simply referred to as “lower side”.
  • the vertical direction in the present specification is merely a direction used for explanation, and does not limit the posture during use and distribution of the motor.
  • FIG. 1 is a cross-sectional view of the motor 1 of the embodiment.
  • the motor 1 includes a rotor 10, a stator 20 that surrounds the rotor 10, an upper bearing 15 and a lower bearing (bearing) 16 that rotatably hold the rotor 10 with respect to the stator 20, and an upper bearing that holds the upper bearing 15. It has a holder 40, a lower bearing holder (bearing holder) 70 for holding the lower bearing 16, and a housing 30.
  • the rotor 10 rotates about a central axis J extending in the vertical direction.
  • the rotor 10 has a shaft 11 extending along the central axis J, a rotor core 12, and a rotor magnet 13.
  • the shaft 11 is rotatably supported around the central axis J by the upper bearing 15 and the lower bearing 16.
  • the rotor core 12 is fixed to the outer peripheral surface of the shaft 11.
  • the rotor magnet 13 is fixed to the outer peripheral surface of the rotor core 12.
  • the plurality of rotor magnets 13 may be embedded inside the rotor core 12.
  • the upper bearing 15 is located above the stator 20, and the lower bearing 16 is located below the stator 20.
  • the upper bearing 15 supports the upper end of the shaft 11, and the lower bearing 16 supports the lower end of the shaft 11.
  • the upper bearing 15 and the lower bearing 16 of the present embodiment are ball bearings.
  • the upper bearing 15 and the lower bearing 16 may be other types of bearings such as needle bearings.
  • the upper bearing holder 40 is located above the stator 20.
  • the upper bearing holder 40 is made of metal.
  • the upper bearing holder 40 has a holder cylinder portion 41, an upper plate portion 42 extending radially inward from the upper end of the holder cylinder portion 41, and a holder flange portion 43 extending radially outward from the lower end of the holder cylinder portion 41. ..
  • the holder cylinder portion 41 has a cylindrical shape centered on the central axis J.
  • the upper bearing 15 is arranged inside the holder cylinder portion 41 in the radial direction.
  • the upper plate portion 42 covers the upper side of the outer ring of the upper bearing 15.
  • the upper plate portion 42 is provided with a central hole 42a penetrating in the axial direction.
  • the shaft 11 is inserted through the central hole 42a.
  • the radial outer edge of the holder flange 43 is embedded in the housing 30. That is, at least a part of the upper bearing holder 40 is embedded in the housing 30.
  • the stator 20 surrounds the rotor 10 from the outside in the radial direction.
  • the stator 20 faces the rotor 10 in the radial direction.
  • the stator 20 includes a stator core 21, an insulator 22, and a coil 29.
  • the stator core 21 has an annular core back portion 21a centered on the central axis J and a plurality of teeth portions 21b extending radially inward from the core back portion 21a.
  • a plurality of tooth portions 21b are provided at equal intervals in the circumferential direction around the central axis J.
  • the coil 29 is attached to the teeth portion 21b via the insulator 22.
  • the end of the coil 29 is connected to a bus bar 80 located below the stator 20.
  • the bus bar 80 is connected to a control device (not shown). Electric power is supplied to the coil 29 from the control device via the bus bar 80.
  • the housing 30 is made of a resin material.
  • the resin material may be a composite material reinforced with a fiber material such as glass fiber or carbon fiber. That is, the housing 30 may be a fiber reinforced resin material. Further, the housing 30 may be a thermosetting resin or a thermoplastic resin.
  • the stator 20 and the upper bearing holder 40 are embedded in the housing 30.
  • the housing 30 holds the stator 20 and the upper bearing holder 40.
  • the housing 30 is insert-molded while holding the stator 20 and the upper bearing holder 40 in the mold. That is, since the stator 20 and the upper bearing holder 40 can be embedded in the housing 30 at one time, the assembly process of the motor 1 is simplified.
  • the housing 30 includes a main body 31 that holds the stator 20, a plurality of ribs 3 that protrude upward from the upper surface of the main body 31, a lower cylinder portion 37 that extends downward from the outer edge of the main body 31, and an upper bearing holder 40. It has a holder holding portion 38 for holding the bearing, and a holding wall portion (wall portion) 39 located below the main body portion 31 and to which the lower bearing holder 70 is fixed.
  • the stator 20 is embedded in the main body 31.
  • the main body 31 surrounds the upper side, the lower side, and the radial outer side with respect to the stator 20.
  • the main body 31 surrounds the teeth portion 21b and the coil 29, and is also provided between the teeth portions 21b and the coil 29 that are adjacent to each other in the circumferential direction.
  • the inner peripheral surface of the stator core 21 is exposed from the housing 30.
  • the plurality of ribs 3 project upward from the upper surface of the main body 31.
  • the plurality of ribs 3 extend in the circumferential direction and the radial direction to reinforce the housing 30.
  • the holder holding portion 38 is located above the main body portion 31.
  • the holder holding portion 38 extends radially inward from the inner end of the main body portion 31. Further, the holder holding portion 38 is located inside the rib 3 in the radial direction.
  • the holder flange portion 43 of the upper bearing holder 40 is embedded in the holder holding portion 38. As a result, the holder holding portion 38 holds the upper bearing holder 40.
  • the holding wall portion 39 projects downward from the lower surface of the main body portion 31. That is, the holding wall portion 39 is located below the stator 20.
  • the holding wall portion 39 has an annular shape centered on the central axis J.
  • the holding wall portion 39 has a lower surface 39b facing downward and a mounting inner peripheral surface 39a facing inward in the radial direction.
  • the lower surface 39b is a plane orthogonal to the central axis J.
  • the mounting inner peripheral surface 39a is a cylindrical surface centered on the central axis J. As will be described later, the lower bearing holder 70 is attached to the lower surface 39b and the mounting inner peripheral surface 39a.
  • the holding wall portion 39 has a plurality of mounting pins 39p protruding downward from the lower surface 39b.
  • the mounting pin 39p has a cylindrical shape extending in the axial direction.
  • the plurality of mounting pins 39p are arranged along the circumferential direction. As will be described later, the plurality of mounting pins 39p are inserted into the through holes 73h of the lower bearing holder 70 and heated. As a result, the holding wall portion 39 holds the lower bearing holder 70.
  • the lower cylinder portion 37 is located below the main body portion 31.
  • the lower cylinder portion 37 has a cylindrical shape centered on the central axis J.
  • the outer peripheral surface of the lower cylinder portion 37 is continuous with the outer peripheral surface of the main body portion 31.
  • a control device (not shown) for controlling the motor 1 is attached to the lower cylinder portion 37.
  • the bus bar 80 which will be described later, is connected to a socket portion (not shown) provided in the control device.
  • the inner peripheral surface of the lower cylinder portion 37 and the control device are sealed by a seal structure (not shown).
  • the lower bearing holder 70 rotatably supports the rotor 10 with respect to the stator 20 via the lower bearing 16.
  • the lower bearing holder 70 is located below the stator 20.
  • the lower bearing holder 70 is fixed to the housing 30 on the lower side of the main body 31 and on the radial inside of the lower cylinder 37.
  • FIG. 2 is a cross-sectional view of the lower bearing holder 70.
  • the lower bearing holder 70 has a resin portion 75 made of resin and a bus bar 80 embedded in the resin portion 75.
  • the bus bar 80 is made of a highly conductive metal material (for example, a copper-based alloy).
  • the bus bar 80 has a plate shape.
  • the bus bar 80 is formed by pressing a plate material.
  • the bus bar 80 is connected to a leader line 28 extending from the coil 29. As a result, the bus bar 80 is electrically connected to the coil 29.
  • the bus bar 80 has a base 83, an inclined portion 84, a connecting portion 81, and an external connecting terminal portion 82.
  • the base 83 extends in a strip shape along the radial direction.
  • the base portion 83 has a plate thickness direction in the axial direction.
  • the base portion 83 has an inner end portion 83a which is a radial inner end portion and an outer end portion 83b which is a radial outer end portion.
  • the base portion 83 is exposed to the outside at the outer end portion 83b, and is embedded in the resin portion 75 in a region other than the outer end portion 83b.
  • the base 83 has a through hole 83h that penetrates in the axial direction.
  • the inclined portion 84 extends radially outward and downward from the outer end portion 83b of the base portion 83 in a band shape.
  • the inclined portion 84 is connected to the base portion 83 at the upper end portion and is connected to the connecting portion 81 at the lower end portion. That is, the inclined portion 84 connects the base portion 83 and the connecting portion 81.
  • the connecting portion 81 extends in a strip shape along the axial direction.
  • the radial direction of the connecting portion 81 is the plate thickness direction.
  • the connecting portion 81 is connected to the inclined portion 84 at the upper end portion.
  • the connecting portion 81 has an outer surface 81b that faces outward in the radial direction.
  • the connecting portion 81 is connected to the leader line 28 on the outer surface 81b.
  • the connecting means between the connecting portion 81 and the leader wire 28 is not particularly limited, and is, for example, resistance welding.
  • the leader wire 28 connected to the connecting portion 81 is the end of the winding start or the end of the winding end of the coil 29.
  • the leader wire 28 extends from the lower surface of the main body 31 of the housing 30 and is exposed.
  • a plurality of leader lines 28 may be connected to one connection portion 81.
  • the leader line 28 may be connected to the relay bus bar embedded in the main body 31, and the terminal of the relay bus bar may be exposed from the main body 31 and connected to the connection 81. That is, the bus bar 80 may be electrically connected to the coil 29 via another member.
  • the external connection terminal portion 82 extends in a strip shape along the axial direction.
  • the radial direction of the external connection terminal portion 82 is the plate thickness direction.
  • the external connection terminal portion 82 is connected to the inner end portion 83a of the base portion 83 at the upper end portion.
  • the external connection terminal portion 82 is embedded in the resin portion 75 at the upper end portion and exposed from the resin portion 75 at the lower end portion.
  • the external connection terminal portion 82 projects downward from the lower surface of the resin portion 75.
  • the external connection terminal portion 82 is inserted into a socket portion provided in a control device (not shown). As a result, the bus bar 80 is connected to the control device. The control device supplies electric power to the stator 20 via the bus bar 80.
  • the resin portion 75 holds the lower bearing 16.
  • the resin material constituting the resin portion 75 may be a composite material reinforced with a non-conductive fiber material such as glass fiber. That is, the housing 30 may be a fiber reinforced resin material. Further, the resin material constituting the resin portion 75 may be a thermosetting resin or a thermoplastic resin.
  • the resin portion 75 includes a tubular portion 71, a first bottom plate portion 72 extending radially inward from the lower end of the tubular portion 71, a flange portion 73 extending radially outward from the outer peripheral surface of the tubular portion 71, and a flange. It has an annular portion 74 protruding upward from the portion 73. A part of the bus bar 80 is embedded in the resin portion 75 at the flange portion 73.
  • the tubular portion 71 has a cylindrical shape centered on the central axis J.
  • a lower bearing 16 is arranged inside the tubular portion 71 in the radial direction. That is, the tubular portion 71 surrounds the lower bearing 16 from the outside in the radial direction. As a result, the lower bearing 16 is positioned on the lower bearing holder 70 in the radial direction.
  • the first bottom plate portion 72 extends radially inward from the lower end of the tubular portion 71.
  • the first bottom plate portion 72 comes into contact with the lower surface of the outer ring of the lower bearing 16.
  • the lower bearing holder 70 restricts the lower bearing 16 from moving downward.
  • the first bottom plate portion 72 is provided with a central hole 72a penetrating in the radial direction. The shaft 11 is inserted through the central hole 72a.
  • the flange portion 73 extends radially outward from the tubular portion 71.
  • the flange portion 73 has a disc shape with the central axis J as the center and the axial direction in the plate thickness direction.
  • a part of the bus bar 80 is embedded in the flange portion 73.
  • the external connection terminal portion 82 projects downward from the lower surface 73c of the flange portion 73.
  • the base portion 83 projects outward in the radial direction from the outer edge 73a of the flange portion 73.
  • the flange portion 73 is connected to the axially central portion of the tubular portion 71. That is, the flange portion 73 extends radially outward from the axially central portion of the tubular portion 71. Therefore, the flange portion 73 is provided on the outer peripheral surface of the tubular portion 71 and functions as a rib extending along the circumferential direction to reinforce the tubular portion 71. As a result, deformation of the tubular portion 71 can be suppressed even when a load is applied from the shaft 11 to the tubular portion 71 via the lower bearing 16. Further, by connecting the flange portion 73 to the axially central portion of the tubular portion 71, the cooling of the tubular portion 71 at the time of molding can be uniformly brought closer.
  • the axially central portion of the tubular portion 71 means an area between the upper end portion and the lower end portion of the tubular portion 71, and means only the axially central dimension point of the tubular portion 71. It's not a thing.
  • the annular portion 74 projects upward from the upper surface 73b of the flange portion 73 and extends along the circumferential direction about the central axis J. In the present embodiment, the annular portion 74 extends seamlessly over the entire circumference in the circumferential direction. However, a plurality of annular portions 74 may be discretely arranged along the circumferential direction as long as they extend in an annular shape along the circumferential direction.
  • the flange portion 73 has a plurality of through holes 73h penetrating in the axial direction.
  • the plurality of through holes 73h are arranged along the circumferential direction.
  • the mounting pin 39p of the holding wall portion 39 is inserted into the through hole 73h.
  • the lower end of the mounting pin 39p is formed into a hemisphere larger than the hole diameter of the through hole 73h by heat caulking.
  • the flange portion 73 is fixed to the housing 30.
  • a thermoplastic resin is selected as the resin material constituting the housing 30.
  • the upper surface 73b of the flange portion 73 comes into contact with the lower surface 39b of the holding wall portion 39.
  • the lower bearing holder 70 is positioned axially with respect to the housing 30.
  • the annular portion 74 fits inside the holding wall portion 39. More specifically, the outer peripheral surface 74a of the annular portion 74 is in contact with the mounting inner peripheral surface 39a provided on the housing 30 over the entire circumference. As a result, the lower bearing holder 70 is positioned radially with respect to the housing 30.
  • the annular portion 74 is located inside the outer edge 73a of the flange portion 73.
  • the annular portion 74 effectively reinforces the flange portion 73 and suppresses the deformation of the flange portion.
  • the annular portion 74 faces the tubular portion 71 in the radial direction with a gap. That is, a gap is provided between the inner peripheral surface of the annular portion 74 and the outer peripheral surface of the tubular portion 71. According to the present embodiment, it is possible to suppress the local increase in the wall thickness of the resin portion 75 as compared with the case where the tubular portion and the annular portion are integrally connected, and suppress the sink mark of the resin portion 75. it can.
  • the tubular portion may function as an annular portion.
  • the lower bearing is positioned in the housing 30 by fitting the tubular portion that holds the lower bearing 16 inside the holding wall portion 39.
  • the resin portion 75 of the lower bearing holder 70 not only holds the lower bearing 16 but also the bus bar 80. Therefore, it is not necessary to provide the bearing holder and the bus bar holder, respectively, and the number of parts of the motor 1 can be reduced. As a result, the assembly process of the motor 1 can be simplified and the motor 1 can be manufactured at low cost.
  • the lower bearing holder 70 holds the lower bearing 16 and also holds the bus bar 80 to function as a bus bar holder. Therefore, the motor 1 can be downsized as compared with the case where the bearing holder and the bus bar holder are arranged side by side on the lower side of the stator.
  • a plurality of bus bars 80 are embedded in the resin portion 75. Therefore, the resin portion 75 is reinforced by the plurality of bus bars 80. Therefore, the deformation of the lower bearing holder 70 is suppressed even when a load is received from the outside. A load from the shaft 11 is applied to the lower bearing holder 70 via the lower bearing 16. If the lower bearing holder 70 is deformed by this load, the rotating shaft of the shaft 11 becomes unstable, and the power transmission efficiency to the external device may deteriorate. According to the present embodiment, the resin portion 75 is reinforced by the plurality of bus bars 80, so that the deformation of the lower bearing holder 70 is suppressed and the rotation of the shaft 11 can be stabilized.
  • FIG. 3 is a view after the lower bearing holder 70 of the present embodiment is further processed.
  • the lower bearing holder 70 of the present embodiment may be processed to fix the outer ring of the lower bearing 16.
  • the resin portion 75 has a second bottom plate portion 71a extending radially inward from the upper side of the first bottom plate portion 72 in the tubular portion 71.
  • the second bottom plate portion 71a is formed by, for example, heating and softening the upper end portion of the tubular portion 71, then tilting the softened upper end portion inward in the radial direction, and curing the portion tilted inward in the radial direction again. Will be done.
  • the second bottom plate portion 71a comes into contact with the upper surface of the outer ring of the lower bearing 16. As a result, the lower bearing holder 70 restricts the lower bearing 16 from moving upward. According to this configuration, the outer ring of the lower bearing 16 is sandwiched between the first bottom plate portion 72 and the second bottom plate portion 71a. Therefore, it is possible to prevent the lower bearing 16 from rattling in the axial direction with respect to the lower bearing holder 70.
  • a thermoplastic resin is adopted as the resin material constituting the resin portion 75.
  • FIG. 4 is a partial cross-sectional view of the lower bearing holder 170 of the modified example 1.
  • the lower bearing holder 170 of the first modification will be described with reference to FIG.
  • the lower bearing holder 170 of this modification is mainly different from the above-described embodiment in that the seal member 171c is provided on the inner peripheral surface of the tubular portion 171.
  • the resin portion 75 of the lower bearing holder 170 has a tubular portion 171.
  • the tubular portion 171 has a cylindrical shape centered on the central axis J.
  • a lower bearing 16 is arranged inside the tubular portion 171 in the radial direction. That is, the tubular portion 171 surrounds the lower bearing 16 from the outside in the radial direction.
  • Two concave grooves 171b extending along the circumferential direction are provided on the inner peripheral surface of the tubular portion 171.
  • An annular seal member 171c is arranged in each of the two concave grooves 171b. That is, the lower bearing holder 170 has a seal member 171c.
  • the seal member 171c is sandwiched between the bottom surface of the concave groove 171b and the outer peripheral surface of the outer ring and compressed. In this modification, the seal member 171c is an O-ring.
  • the compressed seal member 171c is arranged between the inner peripheral surface of the tubular portion 171 and the outer peripheral surface of the outer ring.
  • the reaction force of the compressed seal member 171c presses the outer ring of the lower bearing 16 inward in the radial direction. As a result, it is possible to prevent the lower bearing 16 from rattling with respect to the lower bearing holder 170.
  • FIG. 5 is a partial cross-sectional view of the lower bearing holder 270 of the modified example 2.
  • the lower bearing holder 270 of the modification 2 will be described with reference to FIG.
  • the lower bearing holder 270 of this modification is mainly different in that it has a metal holder portion 276 as compared with the above-described embodiment.
  • the lower bearing holder 270 of this modification has a resin portion 275 made of resin, a bus bar 80 embedded in the resin portion 275, and a metal holder portion 276.
  • the metal holder portion 276 is made of metal.
  • the metal holder portion 276 includes a metal cylinder portion 279, a metal bottom plate portion 277 extending radially inward from the lower end portion of the metal cylinder portion 279, and a collar extending radially outward from the upper end portion of the metal cylinder portion 279. It has a part 278 and.
  • the radial outer edge of the collar 278 is embedded in the resin portion 275.
  • the collar portion 278 has an embedded region 278a embedded in the resin portion 275 and an exposed region 278b exposed from the resin portion 275.
  • the exposed region 278b is located radially inward with respect to the embedded region 278a.
  • the embedded region 278a and the exposed region 278b are provided on the upper surface and the lower surface of the collar portion 278, respectively.
  • the mold for molding the resin portion 275 sandwiches the collar portion 278 from above and below in the exposed region 278b. As a result, the mold supports the metal holder portion 276. According to this modification, by providing the exposed area 278b on the upper and lower surfaces of the flange portion 278, the metal holder portion 276 is firmly held in the mold, and the metal holder portion 276 is highly accurate with respect to the mold. Can be positioned with. As a result, the positional accuracy of the metal holder portion 276 with respect to the resin portion 275 can be improved.
  • the metal cylinder portion 279 has a cylindrical shape centered on the central axis J.
  • a lower bearing 16 is arranged inside the metal cylinder portion 279 in the radial direction. That is, the metal cylinder portion 279 surrounds the lower bearing 16 from the outside in the radial direction. As a result, the lower bearing 16 is positioned on the lower bearing holder 270 in the radial direction.
  • the metal bottom plate portion 277 covers the lower side of the outer ring of the lower bearing 16.
  • An elastic member 290 is provided between the metal bottom plate portion 277 and the outer ring of the lower bearing 16.
  • the elastic member 290 is a wave washer.
  • the elastic member 290 applies a preload to the outer ring of the lower bearing 16 to suppress rattling of the lower bearing 16.
  • the metal bottom plate portion 277 is provided with a central hole 277a penetrating in the axial direction. The shaft 11 is inserted through the central hole 277a.
  • the metal holder portion 276 holds the lower bearing 16. That is, the resin portion 275 holds the lower bearing 16 via the metal holder portion 276 made of metal. Therefore, even when a load is applied from the shaft 11 to the lower bearing holder 270 via the lower bearing 16, deformation of the lower bearing holder 270 can be suppressed and the holding stability of the shaft 11 can be improved. ..
  • the resin portion 275 includes a flange holding portion 272 that embeds the embedded region 278a of the flange portion 278, a surrounding cylinder portion (cylinder portion) 271 that extends downward from the outer edge of the flange holding portion 272, and a lower side of the surrounding cylinder portion 271. It has a flange portion 273 extending radially outward from the end portion, and an annular portion 274 protruding upward from the flange portion 273.
  • the resin portion 275 embeds the bus bar 80 in the flange portion 273.
  • the surrounding cylinder portion 271 has a tubular shape extending in the axial direction about the central axis J.
  • the surrounding cylinder portion 271 surrounds the metal cylinder portion 279 from the outside in the radial direction through a gap.
  • the surrounding cylinder portion 271 is connected to the flange holding portion 272 at the upper end portion and is connected to the flange portion 273 at the lower end portion. Therefore, the surrounding cylinder portion 271 connects the flange portion 272 and the flange portion 273 in a crank shape.
  • the lower bearing holder 270 is fixed to the housing 30 at the flange portion 273. Stress along the radial direction may be applied to the flange portion 273 in the process of fixing to the housing 30.
  • Stress along the radial direction may be applied to the flange portion 273 in the process of fixing to the housing 30.
  • thermal stress is applied to the flange portion 273 along the radial direction.
  • the flange portion 273, the surrounding cylinder portion 271 and the flange holding portion 272 are curved in a crank shape toward the inside in the radial direction. Therefore, the radial stress applied to the flange portion 273 can be absorbed by the elastic deformation of the crank shape and suppressed from being transmitted to the lower bearing 16. As a result, it is possible to prevent the lower bearing 16 from being deformed by the stress generated by fixing the flange portion 273 to the housing 30.
  • the flange portion 273 extends radially outward from the surrounding cylinder portion 271.
  • the flange portion 273 has a disk shape with the central axis J as the center and the axial direction in the plate thickness direction.
  • a part of the bus bar 80 is embedded in the flange portion 273.
  • the flange portion 273 is reinforced by embedding the bus bar 80.
  • the annular portion 274 extends in a rib shape along the circumferential direction about the central axis J. Similar to the above-described embodiment, the annular portion 274 is radially positioned with respect to the housing 30 by fitting inside the holding wall portion 39 (see FIG. 1) of the housing 30.
  • the use of the motor of the above-described embodiment and its modified example is not particularly limited.
  • the motors of the above-described embodiment and its modifications are mounted on, for example, an electric pump, an electric power steering, and the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

A motor according to one embodiment of the present invention comprises: a rotor that rotates around a central axis; a stator that faces the rotor in the radial direction; a housing made of resin in which the stator is embedded; a bearing that rotatably supports the rotor with respect to the stator; and a bearing holder that holds the bearing. The bearing holder comprises a resin part that holds the bearing made of resin, and a bus bar connected to a lead line extending from a coil of the stator. The bus bar is embedded in the resin part.

Description

モータmotor
　本発明は、モータに関する。 The present invention relates to a motor.
　コイルから引き出されたコイル線に接続されるバスバーを備えたモータが知られている。特許文献１には、バスバーを埋め込んだバスバーホルダを備えたバスバーユニットが開示されている。このようなモータは、バスバーホルダとは別に、ベアリングを介してシャフトを回転可能に支持する金属製のベアリングホルダを有する。 A motor equipped with a bus bar connected to a coil wire drawn from a coil is known. Patent Document 1 discloses a bus bar unit including a bus bar holder in which a bus bar is embedded. In addition to the busbar holder, such a motor has a metal bearing holder that rotatably supports the shaft via a bearing.
日本国公開公報：特開２０１７－２０１８８２号公報Japanese Publication: Japanese Patent Application Laid-Open No. 2017-2018882
　従来構造では、ステータの軸方向一方側には、バスバーホルダとベアリングホルダとをそれぞれ組み付ける必要があり、モータの製造工程が煩雑化すという問題があった。 In the conventional structure, it is necessary to assemble the bus bar holder and the bearing holder on one side in the axial direction of the stator, which causes a problem that the manufacturing process of the motor becomes complicated.
　本発明は、上記事情に鑑みて、バスバーホルダの機能を有するベアリングホルダによってモータの組み立て工程を簡素化することを目的の一つとする。 In view of the above circumstances, one of the objects of the present invention is to simplify the assembly process of the motor by the bearing holder having the function of the bus bar holder.
　本発明のモータの一つの態様は、中心軸周りに回転するロータと、前記ロータと径方向に対向するステータと、樹脂からなり前記ステータが埋め込まれるハウジングと、前記ステータに対して前記ロータを回転可能に支持するベアリングと、前記ベアリングを保持するベアリングホルダと、を有する。前記ベアリングホルダは、樹脂からなり前記ベアリングを保持する樹脂部と、前記ステータのコイルと電気的に接続されるバスバーと、を有する。前記バスバーが、前記樹脂部に埋め込まれる。 One aspect of the motor of the present invention is a rotor that rotates around a central axis, a stator that faces the rotor in the radial direction, a housing that is made of resin and in which the stator is embedded, and the rotor that rotates with respect to the stator. It has a bearing that can support it and a bearing holder that holds the bearing. The bearing holder has a resin portion made of resin and holding the bearing, and a bus bar electrically connected to the coil of the stator. The bus bar is embedded in the resin portion.
　本発明の一つの態様によれば、バスバーホルダの機能を有するベアリングホルダによってモータの組み立て工程を簡素化できる。 According to one aspect of the present invention, the assembly process of the motor can be simplified by the bearing holder having the function of the bus bar holder.
図１は、一実施形態のモータの断面図である。FIG. 1 is a cross-sectional view of the motor of one embodiment. 図２は、一実施形態の下側ベアリングホルダの断面図である。FIG. 2 is a cross-sectional view of the lower bearing holder of one embodiment. 図３は、一実施形態の下側ベアリングホルダに追加工を施した後の断面図である。FIG. 3 is a cross-sectional view of the lower bearing holder of one embodiment after additional machining. 図４は、変形例１の下側ベアリングホルダの部分断面図である。FIG. 4 is a partial cross-sectional view of the lower bearing holder of the modified example 1. 図５は、変形例２の下側ベアリングホルダの部分断面図である。FIG. 5 is a partial cross-sectional view of the lower bearing holder of the modified example 2.
　以下、図面を参照して本発明を適用した実施形態について詳細に説明する。
　以下の説明において、中心軸Ｊ（図１参照）に平行な方向を単に「軸方向」又は「上下方向」と呼び、中心軸Ｊを中心とする径方向を単に「径方向」と呼び、中心軸Ｊを中心とする周方向、すなわち、中心軸Ｊの軸周りを単に「周方向」と呼ぶ。また、本明細書では、中心軸Ｊに沿った軸方向の一方側を単に「上側」と呼び、他方側を単に「下側」と呼ぶ。なお、本明細書における上下方向は、単に説明のために用いられる方向であって、モータの使用時および流通時の姿勢を限定するものではない。 Hereinafter, embodiments to which the present invention has been applied will be described in detail with reference to the drawings.
In the following description, the direction parallel to the central axis J (see FIG. 1) is simply referred to as "axial direction" or "vertical direction", and the radial direction centered on the central axis J is simply referred to as "radial direction". The circumferential direction around the axis J, that is, the circumference of the central axis J is simply referred to as the "circumferential direction". Further, in the present specification, one side in the axial direction along the central axis J is simply referred to as "upper side", and the other side is simply referred to as "lower side". It should be noted that the vertical direction in the present specification is merely a direction used for explanation, and does not limit the posture during use and distribution of the motor.
　図１は、一実施形態のモータ１の断面図である。
　モータ１は、ロータ１０と、ロータ１０を囲むステータ２０と、ステータ２０に対してロータ１０を回転可能に保持する上側ベアリング１５および下側ベアリング（ベアリング）１６と、上側ベアリング１５を保持する上側ベアリングホルダ４０と、下側ベアリング１６を保持する下側ベアリングホルダ（ベアリングホルダ）７０と、ハウジング３０と、を有する。 FIG. 1 is a cross-sectional view of the motor 1 of the embodiment.
The motor 1 includes a rotor 10, a stator 20 that surrounds the rotor 10, an upper bearing 15 and a lower bearing (bearing) 16 that rotatably hold the rotor 10 with respect to the stator 20, and an upper bearing that holds the upper bearing 15. It has a holder 40, a lower bearing holder (bearing holder) 70 for holding the lower bearing 16, and a housing 30.
　ロータ１０は、上下方向に沿って延びる中心軸Ｊを中心として回転する。ロータ１０は、中心軸Ｊに沿って延びるシャフト１１と、ロータコア１２と、ロータマグネット１３と、を有する。 The rotor 10 rotates about a central axis J extending in the vertical direction. The rotor 10 has a shaft 11 extending along the central axis J, a rotor core 12, and a rotor magnet 13.
　シャフト１１は、上側ベアリング１５および下側ベアリング１６により、中心軸Ｊ周りに回転可能に支持される。シャフト１１の外周面には、ロータコア１２が固定される。また、ロータコア１２の外周面には、ロータマグネット１３が固定される。なお、複数のロータマグネット１３は、ロータコア１２の内部に埋め込まれていてもよい。 The shaft 11 is rotatably supported around the central axis J by the upper bearing 15 and the lower bearing 16. The rotor core 12 is fixed to the outer peripheral surface of the shaft 11. Further, the rotor magnet 13 is fixed to the outer peripheral surface of the rotor core 12. The plurality of rotor magnets 13 may be embedded inside the rotor core 12.
　上側ベアリング１５は、ステータ２０の上側に位置し、下側ベアリング１６は、ステータ２０の下側に位置する。上側ベアリング１５は、シャフト１１の上端部を支持し、下側ベアリング１６は、シャフト１１の下端部を支持する。本実施形態の上側ベアリング１５および下側ベアリング１６は、ボールベアリングである。しかしながら、上側ベアリング１５および下側ベアリング１６は、ニードルベアリング等の他種のベアリングであってもよい。 The upper bearing 15 is located above the stator 20, and the lower bearing 16 is located below the stator 20. The upper bearing 15 supports the upper end of the shaft 11, and the lower bearing 16 supports the lower end of the shaft 11. The upper bearing 15 and the lower bearing 16 of the present embodiment are ball bearings. However, the upper bearing 15 and the lower bearing 16 may be other types of bearings such as needle bearings.
　上側ベアリングホルダ４０は、ステータ２０の上側に位置する。上側ベアリングホルダ４０は、金属製である。上側ベアリングホルダ４０は、ホルダ筒部４１と、ホルダ筒部４１の上端から径方向内側に延びる上板部４２と、ホルダ筒部４１の下端から径方向外側に延びるホルダフランジ部４３と、を有する。 The upper bearing holder 40 is located above the stator 20. The upper bearing holder 40 is made of metal. The upper bearing holder 40 has a holder cylinder portion 41, an upper plate portion 42 extending radially inward from the upper end of the holder cylinder portion 41, and a holder flange portion 43 extending radially outward from the lower end of the holder cylinder portion 41. ..
　ホルダ筒部４１は、中心軸Ｊを中心とする円筒状である。ホルダ筒部４１の径方向内側には、上側ベアリング１５が配置される。上板部４２は、上側ベアリング１５の外輪の上側を覆う。上板部４２には、軸方向に貫通する中央孔４２ａが設けられる。中央孔４２ａには、シャフト１１が挿通される。ホルダフランジ部４３の径方向外側の縁部は、ハウジング３０に埋め込まれる。すなわち、上側ベアリングホルダ４０は、少なくも一部がハウジング３０に埋め込まれる。 The holder cylinder portion 41 has a cylindrical shape centered on the central axis J. The upper bearing 15 is arranged inside the holder cylinder portion 41 in the radial direction. The upper plate portion 42 covers the upper side of the outer ring of the upper bearing 15. The upper plate portion 42 is provided with a central hole 42a penetrating in the axial direction. The shaft 11 is inserted through the central hole 42a. The radial outer edge of the holder flange 43 is embedded in the housing 30. That is, at least a part of the upper bearing holder 40 is embedded in the housing 30.
　ステータ２０は、ロータ１０を径方向外側から囲む。ステータ２０は、ロータ１０と径方向に対向する。ステータ２０は、ステータコア２１と、インシュレータ２２と、コイル２９と、を有する。 The stator 20 surrounds the rotor 10 from the outside in the radial direction. The stator 20 faces the rotor 10 in the radial direction. The stator 20 includes a stator core 21, an insulator 22, and a coil 29.
　ステータコア２１は、中心軸Ｊを中心とする環状のコアバック部２１ａおよびコアバック部２１ａから径方向内側に延びる複数のティース部２１ｂを有する。ティース部２１ｂは、中心軸Ｊ周りの周方向に等間隔で複数設けられる。 The stator core 21 has an annular core back portion 21a centered on the central axis J and a plurality of teeth portions 21b extending radially inward from the core back portion 21a. A plurality of tooth portions 21b are provided at equal intervals in the circumferential direction around the central axis J.
　コイル２９は、インシュレータ２２を介してティース部２１ｂに装着される。コイル２９の端部は、ステータ２０の下側に配置されるバスバー８０に接続される。バスバー８０は、図示略の制御装置に接続される。コイル２９には、バスバー８０を介して制御装置から電力が供給される。 The coil 29 is attached to the teeth portion 21b via the insulator 22. The end of the coil 29 is connected to a bus bar 80 located below the stator 20. The bus bar 80 is connected to a control device (not shown). Electric power is supplied to the coil 29 from the control device via the bus bar 80.
　ハウジング３０は、樹脂材料からなる。本明細書において樹脂材料とは、例えばガラス繊維や炭素繊維のような繊維材によって強化された複合材料であってもよい。すなわち、ハウジング３０は、繊維強化樹脂材料であってもよい。また、ハウジング３０は、熱硬化性樹脂であってもよいし、熱可塑性樹脂であってもよい。 The housing 30 is made of a resin material. In the present specification, the resin material may be a composite material reinforced with a fiber material such as glass fiber or carbon fiber. That is, the housing 30 may be a fiber reinforced resin material. Further, the housing 30 may be a thermosetting resin or a thermoplastic resin.
　ハウジング３０には、ステータ２０および上側ベアリングホルダ４０が埋め込まれる。これにより、ハウジング３０は、ステータ２０および上側ベアリングホルダ４０を保持する。ハウジング３０は、ステータ２０および上側ベアリングホルダ４０を金型内で保持した状態でインサート成形される。すなわち、ステータ２０および上側ベアリングホルダ４０をハウジング３０に対して一度に埋め込むことができるので、モータ１の組み立て工程が簡素化される。 The stator 20 and the upper bearing holder 40 are embedded in the housing 30. As a result, the housing 30 holds the stator 20 and the upper bearing holder 40. The housing 30 is insert-molded while holding the stator 20 and the upper bearing holder 40 in the mold. That is, since the stator 20 and the upper bearing holder 40 can be embedded in the housing 30 at one time, the assembly process of the motor 1 is simplified.
　ハウジング３０は、ステータ２０を保持する本体部３１と、本体部３１の上面から上側に突出する複数のリブ３と、本体部３１の外縁から下側に延びる下筒部３７と、上側ベアリングホルダ４０を保持するホルダ保持部３８と、本体部３１の下側に位置し下側ベアリングホルダ７０が固定される保持壁部（壁部）３９と、を有する。 The housing 30 includes a main body 31 that holds the stator 20, a plurality of ribs 3 that protrude upward from the upper surface of the main body 31, a lower cylinder portion 37 that extends downward from the outer edge of the main body 31, and an upper bearing holder 40. It has a holder holding portion 38 for holding the bearing, and a holding wall portion (wall portion) 39 located below the main body portion 31 and to which the lower bearing holder 70 is fixed.
　本体部３１には、ステータ２０が埋め込まれる。本体部３１は、ステータ２０に対し上側、下側および径方向外側を囲む。本体部３１は、ティース部２１ｂおよびコイル２９を囲むとともに、周方向で互いに隣り合うティース部２１ｂおよびコイル２９の間にも設けられる。ステータコア２１の内周面は、ハウジング３０から露出する。 The stator 20 is embedded in the main body 31. The main body 31 surrounds the upper side, the lower side, and the radial outer side with respect to the stator 20. The main body 31 surrounds the teeth portion 21b and the coil 29, and is also provided between the teeth portions 21b and the coil 29 that are adjacent to each other in the circumferential direction. The inner peripheral surface of the stator core 21 is exposed from the housing 30.
　複数のリブ３は、本体部３１の上面から上側に突出する。複数のリブ３は、周方向および径方向に延びてハウジング３０を補強する。 The plurality of ribs 3 project upward from the upper surface of the main body 31. The plurality of ribs 3 extend in the circumferential direction and the radial direction to reinforce the housing 30.
　ホルダ保持部３８は、本体部３１の上側に位置する。ホルダ保持部３８は、本体部３１の内端から径方向内側に延びる。また、ホルダ保持部３８は、リブ３の径方向内側に位置する。ホルダ保持部３８には、上側ベアリングホルダ４０のホルダフランジ部４３が埋め込まれる。これにより、ホルダ保持部３８は、上側ベアリングホルダ４０を保持する。 The holder holding portion 38 is located above the main body portion 31. The holder holding portion 38 extends radially inward from the inner end of the main body portion 31. Further, the holder holding portion 38 is located inside the rib 3 in the radial direction. The holder flange portion 43 of the upper bearing holder 40 is embedded in the holder holding portion 38. As a result, the holder holding portion 38 holds the upper bearing holder 40.
　保持壁部３９は、本体部３１の下面から下側に突出する。すなわち、保持壁部３９は、ステータ２０の下側に位置する。保持壁部３９は、中心軸Ｊを中心とする環状である。 The holding wall portion 39 projects downward from the lower surface of the main body portion 31. That is, the holding wall portion 39 is located below the stator 20. The holding wall portion 39 has an annular shape centered on the central axis J.
　保持壁部３９は、下側を向く下面３９ｂと、径方向内側を向く取付内周面３９ａと、を有する。下面３９ｂは、中心軸Ｊと直交する平面である。取付内周面３９ａは、中心軸Ｊを中心とする円筒面である。後述するように、下面３９ｂおよび取付内周面３９ａには、下側ベアリングホルダ７０が取り付けられる。 The holding wall portion 39 has a lower surface 39b facing downward and a mounting inner peripheral surface 39a facing inward in the radial direction. The lower surface 39b is a plane orthogonal to the central axis J. The mounting inner peripheral surface 39a is a cylindrical surface centered on the central axis J. As will be described later, the lower bearing holder 70 is attached to the lower surface 39b and the mounting inner peripheral surface 39a.
　保持壁部３９は、下面３９ｂから下側に突出する複数の取付ピン３９ｐを有する。取付ピン３９ｐは、軸方向に延びる円柱形状である。複数の取付ピン３９ｐは、周方向に沿って並ぶ。後述するように、複数の取付ピン３９ｐは、下側ベアリングホルダ７０の貫通孔７３ｈに挿入されて熱かしめされる。これによって、保持壁部３９は、下側ベアリングホルダ７０を保持する。 The holding wall portion 39 has a plurality of mounting pins 39p protruding downward from the lower surface 39b. The mounting pin 39p has a cylindrical shape extending in the axial direction. The plurality of mounting pins 39p are arranged along the circumferential direction. As will be described later, the plurality of mounting pins 39p are inserted into the through holes 73h of the lower bearing holder 70 and heated. As a result, the holding wall portion 39 holds the lower bearing holder 70.
　下筒部３７は、本体部３１の下側に位置する。下筒部３７は、中心軸Ｊを中心とする円筒状である。下筒部３７の外周面は、本体部３１の外周面と連続する。下筒部３７には、モータ１を制御する制御装置（図示略）が取り付けられる。また、後述するバスバー８０は、制御装置に設けられたソケット部（図示略）に接続される。下筒部３７の内周面と制御装置とは、図示略のシール構造によりシールされている。 The lower cylinder portion 37 is located below the main body portion 31. The lower cylinder portion 37 has a cylindrical shape centered on the central axis J. The outer peripheral surface of the lower cylinder portion 37 is continuous with the outer peripheral surface of the main body portion 31. A control device (not shown) for controlling the motor 1 is attached to the lower cylinder portion 37. Further, the bus bar 80, which will be described later, is connected to a socket portion (not shown) provided in the control device. The inner peripheral surface of the lower cylinder portion 37 and the control device are sealed by a seal structure (not shown).
　下側ベアリングホルダ７０は、下側ベアリング１６を介して、ロータ１０をステータ２０に対し回転可能に支持する。下側ベアリングホルダ７０は、ステータ２０の下側に位置する。下側ベアリングホルダ７０は、本体部３１の下側かつ下筒部３７の径方向内側でハウジング３０に固定される。 The lower bearing holder 70 rotatably supports the rotor 10 with respect to the stator 20 via the lower bearing 16. The lower bearing holder 70 is located below the stator 20. The lower bearing holder 70 is fixed to the housing 30 on the lower side of the main body 31 and on the radial inside of the lower cylinder 37.
　図２は、下側ベアリングホルダ７０の断面図である。
　下側ベアリングホルダ７０は、樹脂からなる樹脂部７５と、樹脂部７５に埋め込まれるバスバー８０と、を有する。 FIG. 2 is a cross-sectional view of the lower bearing holder 70.
The lower bearing holder 70 has a resin portion 75 made of resin and a bus bar 80 embedded in the resin portion 75.
　バスバー８０は、導電性が高い金属材料（例えば銅系合金）からなる。バスバー８０は、板状である。バスバー８０は、板材をプレス加工することで成形される。バスバー８０は、コイル２９から延びる引出線２８に接続される。これにより、バスバー８０は、コイル２９と電気的に接続される。
　バスバー８０は、基部８３と傾斜部８４と接続部８１と外部接続端子部８２とを有する。 The bus bar 80 is made of a highly conductive metal material (for example, a copper-based alloy). The bus bar 80 has a plate shape. The bus bar 80 is formed by pressing a plate material. The bus bar 80 is connected to a leader line 28 extending from the coil 29. As a result, the bus bar 80 is electrically connected to the coil 29.
The bus bar 80 has a base 83, an inclined portion 84, a connecting portion 81, and an external connecting terminal portion 82.
　基部８３は、径方向に沿って帯状に延びる。基部８３は、軸方向を板厚方向とする。基部８３は、径方向内側の端部である内端部８３ａと、径方向外側の端部である外端部８３ｂと、を有する。 The base 83 extends in a strip shape along the radial direction. The base portion 83 has a plate thickness direction in the axial direction. The base portion 83 has an inner end portion 83a which is a radial inner end portion and an outer end portion 83b which is a radial outer end portion.
　基部８３は、外端部８３ｂにおいて外部に露出し、外端部８３ｂ以外の領域において、樹脂部７５に埋め込まれる。基部８３は、軸方向に貫通する貫通孔８３ｈを有する。基部８３が樹脂部７５に埋め込まれることで、樹脂部７５の一部が貫通孔８３ｈに入り込み、バスバー８０が樹脂部７５の内部で移動することを抑制する。 The base portion 83 is exposed to the outside at the outer end portion 83b, and is embedded in the resin portion 75 in a region other than the outer end portion 83b. The base 83 has a through hole 83h that penetrates in the axial direction. By embedding the base portion 83 in the resin portion 75, a part of the resin portion 75 enters the through hole 83h, and the bus bar 80 is prevented from moving inside the resin portion 75.
　傾斜部８４は、基部８３の外端部８３ｂから径方向外側かつ下側に傾斜して帯状に延びる。傾斜部８４は、上端部において基部８３に接続され、下端部において接続部８１に接続される。すなわち、傾斜部８４は、基部８３と接続部８１とを繋がる。 The inclined portion 84 extends radially outward and downward from the outer end portion 83b of the base portion 83 in a band shape. The inclined portion 84 is connected to the base portion 83 at the upper end portion and is connected to the connecting portion 81 at the lower end portion. That is, the inclined portion 84 connects the base portion 83 and the connecting portion 81.
　接続部８１は、軸方向に沿って帯状に延びる。接続部８１は、径方向を板厚方向とする。接続部８１は、上端部において傾斜部８４に繋がる。接続部８１は、径方向外側を向く外側面８１ｂを有する。接続部８１は、外側面８１ｂにおいて、引出線２８に接続される。接続部８１と引出線２８との接続手段は、特に限定されることがなく、例えば抵抗溶接である。 The connecting portion 81 extends in a strip shape along the axial direction. The radial direction of the connecting portion 81 is the plate thickness direction. The connecting portion 81 is connected to the inclined portion 84 at the upper end portion. The connecting portion 81 has an outer surface 81b that faces outward in the radial direction. The connecting portion 81 is connected to the leader line 28 on the outer surface 81b. The connecting means between the connecting portion 81 and the leader wire 28 is not particularly limited, and is, for example, resistance welding.
　接続部８１に接続される引出線２８は、コイル２９の巻き始めの末端、又は巻き終わりの末端である。引出線２８は、ハウジング３０の本体部３１の下面から延び出て露出する。１つの接続部８１には、複数の引出線２８が接続されていてもよい。なお、ここでは引出線２８がバスバー８０に直接的に接続される場合について説明した。しかしながら、引出線２８が本体部３１に埋め込まれる中継バスバーに接続され、当該中継バスバーの端子が本体部３１から露出して接続部８１に接続されてもよい。すなわち、バスバー８０は、他部材を介してコイル２９と電気的に接続されていてもよい。 The leader wire 28 connected to the connecting portion 81 is the end of the winding start or the end of the winding end of the coil 29. The leader wire 28 extends from the lower surface of the main body 31 of the housing 30 and is exposed. A plurality of leader lines 28 may be connected to one connection portion 81. Here, a case where the leader line 28 is directly connected to the bus bar 80 has been described. However, the leader line 28 may be connected to the relay bus bar embedded in the main body 31, and the terminal of the relay bus bar may be exposed from the main body 31 and connected to the connection 81. That is, the bus bar 80 may be electrically connected to the coil 29 via another member.
　外部接続端子部８２は、軸方向に沿って帯状に延びる。外部接続端子部８２は、径方向を板厚方向とする。外部接続端子部８２は、上端部において基部８３の内端部８３ａに接続される。外部接続端子部８２は、上端部において樹脂部７５に埋め込まれ下端部において樹脂部７５から露出する。外部接続端子部８２は、樹脂部７５の下面から下側に突出する。 The external connection terminal portion 82 extends in a strip shape along the axial direction. The radial direction of the external connection terminal portion 82 is the plate thickness direction. The external connection terminal portion 82 is connected to the inner end portion 83a of the base portion 83 at the upper end portion. The external connection terminal portion 82 is embedded in the resin portion 75 at the upper end portion and exposed from the resin portion 75 at the lower end portion. The external connection terminal portion 82 projects downward from the lower surface of the resin portion 75.
　外部接続端子部８２は、図示略の制御装置に設けられたソケット部に挿入される。これにより、バスバー８０は、制御装置に接続される。制御装置は、バスバー８０を介してステータ２０に電力を供給する。 The external connection terminal portion 82 is inserted into a socket portion provided in a control device (not shown). As a result, the bus bar 80 is connected to the control device. The control device supplies electric power to the stator 20 via the bus bar 80.
　樹脂部７５は、下側ベアリング１６を保持する。樹脂部７５を構成する樹脂材料は、例えばガラス繊維のような非導電性の繊維材によって強化された複合材料であってもよい。すなわち、ハウジング３０は、繊維強化樹脂材料であってもよい。また、樹脂部７５を構成する樹脂材料は、熱硬化性樹脂であってもよいし、熱可塑性樹脂であってもよい。 The resin portion 75 holds the lower bearing 16. The resin material constituting the resin portion 75 may be a composite material reinforced with a non-conductive fiber material such as glass fiber. That is, the housing 30 may be a fiber reinforced resin material. Further, the resin material constituting the resin portion 75 may be a thermosetting resin or a thermoplastic resin.
　樹脂部７５は、筒部７１と、筒部７１の下側の端部から径方向内側に延びる第１底板部７２と、筒部７１の外周面から径方向外側に延びるフランジ部７３と、フランジ部７３から上側に突出する環状部７４と、を有する。樹脂部７５には、フランジ部７３においてバスバー８０の一部が埋め込まれる。 The resin portion 75 includes a tubular portion 71, a first bottom plate portion 72 extending radially inward from the lower end of the tubular portion 71, a flange portion 73 extending radially outward from the outer peripheral surface of the tubular portion 71, and a flange. It has an annular portion 74 protruding upward from the portion 73. A part of the bus bar 80 is embedded in the resin portion 75 at the flange portion 73.
　筒部７１は、中心軸Ｊを中心とする円筒状である。筒部７１の径方向内側には、下側ベアリング１６が配置される。すなわち、筒部７１は、下側ベアリング１６を径方向外側から囲む。これにより、下側ベアリング１６は、径方向において下側ベアリングホルダ７０に位置決めされる。 The tubular portion 71 has a cylindrical shape centered on the central axis J. A lower bearing 16 is arranged inside the tubular portion 71 in the radial direction. That is, the tubular portion 71 surrounds the lower bearing 16 from the outside in the radial direction. As a result, the lower bearing 16 is positioned on the lower bearing holder 70 in the radial direction.
　第１底板部７２は、筒部７１の下側の端部から径方向内側に延びる。第１底板部７２は、下側ベアリング１６の外輪の下面に接触する。これにより、下側ベアリングホルダ７０は、下側ベアリング１６が下側に移動することを制限する。第１底板部７２には、径方向に貫通する中央孔７２ａが設けられる。中央孔７２ａには、シャフト１１が挿通される。 The first bottom plate portion 72 extends radially inward from the lower end of the tubular portion 71. The first bottom plate portion 72 comes into contact with the lower surface of the outer ring of the lower bearing 16. As a result, the lower bearing holder 70 restricts the lower bearing 16 from moving downward. The first bottom plate portion 72 is provided with a central hole 72a penetrating in the radial direction. The shaft 11 is inserted through the central hole 72a.
　フランジ部７３は、筒部７１から径方向外側に延びる。フランジ部７３は、中心軸Ｊを中心とし軸方向を板厚方向する円板状である。フランジ部７３の内部には、バスバー８０の一部が埋め込まれる。フランジ部７３の下面７３ｃからは、外部接続端子部８２が下側に向かって突出する。また、フランジ部７３の外縁７３ａからは、基部８３が径方向外側に向かって突出する。 The flange portion 73 extends radially outward from the tubular portion 71. The flange portion 73 has a disc shape with the central axis J as the center and the axial direction in the plate thickness direction. A part of the bus bar 80 is embedded in the flange portion 73. The external connection terminal portion 82 projects downward from the lower surface 73c of the flange portion 73. Further, the base portion 83 projects outward in the radial direction from the outer edge 73a of the flange portion 73.
　フランジ部７３は、筒部７１の軸方向中央部に接続される。すなわち、フランジ部７３は、筒部７１の軸方向中央部から径方向外側に延びる。このため、フランジ部７３は、筒部７１の外周面に設けられ周方向に沿って延びるリブとして機能し筒部７１を補強する。これにより、下側ベアリング１６を介してシャフト１１から筒部７１に荷重が加わった場合であっても筒部７１の変形を抑制できる。また、フランジ部７３が、筒部７１の軸方向中央部に接続されることで成形時の筒部７１の冷却を一様に近づけることができる。このため、本実施形態によれば、フランジ部が筒部の上端部又は下端部に接続される場合と比較して、筒部７１の径方向内側への倒れを抑制できる。
　なお、本明細書において、筒部７１の軸方向中央部とは、筒部７１の上端部と下端部との間の領域を意味し、筒部７１の軸方向の寸法中央点のみを意味するものではない。 The flange portion 73 is connected to the axially central portion of the tubular portion 71. That is, the flange portion 73 extends radially outward from the axially central portion of the tubular portion 71. Therefore, the flange portion 73 is provided on the outer peripheral surface of the tubular portion 71 and functions as a rib extending along the circumferential direction to reinforce the tubular portion 71. As a result, deformation of the tubular portion 71 can be suppressed even when a load is applied from the shaft 11 to the tubular portion 71 via the lower bearing 16. Further, by connecting the flange portion 73 to the axially central portion of the tubular portion 71, the cooling of the tubular portion 71 at the time of molding can be uniformly brought closer. Therefore, according to the present embodiment, it is possible to suppress the radial inward tilt of the tubular portion 71 as compared with the case where the flange portion is connected to the upper end portion or the lower end portion of the tubular portion.
In the present specification, the axially central portion of the tubular portion 71 means an area between the upper end portion and the lower end portion of the tubular portion 71, and means only the axially central dimension point of the tubular portion 71. It's not a thing.
　環状部７４は、フランジ部７３の上面７３ｂから上側に突出し中心軸Ｊを中心として周方向に沿って延びる。本実施形態において、環状部７４は、周方向の全周に亘って途切れなく延びる。しかしながら環状部７４は、周方向に沿って環状に延びていれば周方向に沿って離散的に複数配置されていてもよい。 The annular portion 74 projects upward from the upper surface 73b of the flange portion 73 and extends along the circumferential direction about the central axis J. In the present embodiment, the annular portion 74 extends seamlessly over the entire circumference in the circumferential direction. However, a plurality of annular portions 74 may be discretely arranged along the circumferential direction as long as they extend in an annular shape along the circumferential direction.
　図１に示すように、フランジ部７３は、軸方向に貫通する複数の貫通孔７３ｈを有する。複数の貫通孔７３ｈは、周方向に沿って並ぶ。貫通孔７３ｈには、保持壁部３９の取付ピン３９ｐが挿入される。取付ピン３９ｐの下端部は、熱かしめによって貫通孔７３ｈの穴径より大きい半球状に成形される。これにより、フランジ部７３は、ハウジング３０に固定される。
　なお、熱かしめによって、下側ベアリングホルダ７０をハウジング３０に固定する場合、ハウジング３０を構成する樹脂材料としては、熱可塑性樹脂が選択される。 As shown in FIG. 1, the flange portion 73 has a plurality of through holes 73h penetrating in the axial direction. The plurality of through holes 73h are arranged along the circumferential direction. The mounting pin 39p of the holding wall portion 39 is inserted into the through hole 73h. The lower end of the mounting pin 39p is formed into a hemisphere larger than the hole diameter of the through hole 73h by heat caulking. As a result, the flange portion 73 is fixed to the housing 30.
When the lower bearing holder 70 is fixed to the housing 30 by heat caulking, a thermoplastic resin is selected as the resin material constituting the housing 30.
　フランジ部７３の上面７３ｂは、保持壁部３９の下面３９ｂに接触する。これにより、下側ベアリングホルダ７０は、ハウジング３０に対して軸方向に位置決めされる。また、環状部７４は、保持壁部３９の内側に嵌る。より具体的には、環状部７４の外周面７４ａは、全周に亘って、ハウジング３０に設けられた取付内周面３９ａと接する。これにより、下側ベアリングホルダ７０は、ハウジング３０に対して径方向に位置決めされる。 The upper surface 73b of the flange portion 73 comes into contact with the lower surface 39b of the holding wall portion 39. As a result, the lower bearing holder 70 is positioned axially with respect to the housing 30. Further, the annular portion 74 fits inside the holding wall portion 39. More specifically, the outer peripheral surface 74a of the annular portion 74 is in contact with the mounting inner peripheral surface 39a provided on the housing 30 over the entire circumference. As a result, the lower bearing holder 70 is positioned radially with respect to the housing 30.
　環状部７４は、フランジ部７３の外縁７３ａより内側に位置する。これにより、環状部７４は、フランジ部７３を効果的に補強しフランジ部の変形を抑制する。また、本実施形態によれば、環状部がフランジ部の外縁に設けられる場合と比較して、成形時に環状部７４にヒケが発生することを抑制することができ、環状部７４の寸法精度を高めることができる。結果的に、ハウジング３０に対する下側ベアリングホルダ７０の位置精度を高めることができる。 The annular portion 74 is located inside the outer edge 73a of the flange portion 73. As a result, the annular portion 74 effectively reinforces the flange portion 73 and suppresses the deformation of the flange portion. Further, according to the present embodiment, it is possible to suppress the occurrence of sink marks on the annular portion 74 during molding as compared with the case where the annular portion is provided on the outer edge of the flange portion, and the dimensional accuracy of the annular portion 74 can be improved. Can be enhanced. As a result, the positioning accuracy of the lower bearing holder 70 with respect to the housing 30 can be improved.
　環状部７４は、筒部７１と径方向に隙間を介して対向する。すなわち、環状部７４の内周面と筒部７１の外周面との間には、隙間が設けられる。本実施形態によれば、筒部と環状部とが一体的に繋がる場合と比較して樹脂部７５の肉厚が局所的に大きくなることを抑制することができ、樹脂部７５のヒケを抑制できる。 The annular portion 74 faces the tubular portion 71 in the radial direction with a gap. That is, a gap is provided between the inner peripheral surface of the annular portion 74 and the outer peripheral surface of the tubular portion 71. According to the present embodiment, it is possible to suppress the local increase in the wall thickness of the resin portion 75 as compared with the case where the tubular portion and the annular portion are integrally connected, and suppress the sink mark of the resin portion 75. it can.
　本実施形態では、樹脂部７５が環状部７４と筒部７１とをそれぞれ有する場合について説明した。しかしながら、他の構成として、筒部が環状部として機能してもよい。このように構成した場合、下側ベアリング１６を保持する筒部が保持壁部３９の内側に嵌ることで、下側ベアリングがハウジング３０に位置決めされる。 In the present embodiment, the case where the resin portion 75 has the annular portion 74 and the tubular portion 71, respectively, has been described. However, as another configuration, the tubular portion may function as an annular portion. In this configuration, the lower bearing is positioned in the housing 30 by fitting the tubular portion that holds the lower bearing 16 inside the holding wall portion 39.
　本実施形態によれば、下側ベアリングホルダ７０の樹脂部７５が、下側ベアリング１６を保持するのみならずバスバー８０を保持する。このため、ベアリングホルダとバスバーホルダとをそれぞれ設ける必要がなく、モータ１の部品点数を削減することができる。結果的に、モータ１の組み立て工程を簡素化しモータ１を安価に製造できる。 According to this embodiment, the resin portion 75 of the lower bearing holder 70 not only holds the lower bearing 16 but also the bus bar 80. Therefore, it is not necessary to provide the bearing holder and the bus bar holder, respectively, and the number of parts of the motor 1 can be reduced. As a result, the assembly process of the motor 1 can be simplified and the motor 1 can be manufactured at low cost.
　本実施形態によれば、下側ベアリングホルダ７０が、下側ベアリング１６を保持するとともに、バスバー８０を保持してバスバーホルダとして機能する。したがって、ステータの下側にベアリングホルダとバスバーホルダとが複数部材が並んで配置される場合と比較して、モータ１を小型化することができる。 According to this embodiment, the lower bearing holder 70 holds the lower bearing 16 and also holds the bus bar 80 to function as a bus bar holder. Therefore, the motor 1 can be downsized as compared with the case where the bearing holder and the bus bar holder are arranged side by side on the lower side of the stator.
　本実施形態によれば、樹脂部７５には、複数のバスバー８０が埋め込まれる。このため、樹脂部７５は、複数のバスバー８０によって補強される。このため、外部から荷重を受けた場合であっても下側ベアリングホルダ７０の変形が抑制される。下側ベアリングホルダ７０には、下側ベアリング１６を介してシャフト１１からの荷重が加わる。この荷重によって下側ベアリングホルダ７０が変形するとシャフト１１の回転軸が不安定となり、外部装置への動力伝達効率が悪化する虞がある。本実施形態によれば、樹脂部７５が複数のバスバー８０によって補強されることで、下側ベアリングホルダ７０の変形が抑制され、シャフト１１の回転を安定させることができる。 According to this embodiment, a plurality of bus bars 80 are embedded in the resin portion 75. Therefore, the resin portion 75 is reinforced by the plurality of bus bars 80. Therefore, the deformation of the lower bearing holder 70 is suppressed even when a load is received from the outside. A load from the shaft 11 is applied to the lower bearing holder 70 via the lower bearing 16. If the lower bearing holder 70 is deformed by this load, the rotating shaft of the shaft 11 becomes unstable, and the power transmission efficiency to the external device may deteriorate. According to the present embodiment, the resin portion 75 is reinforced by the plurality of bus bars 80, so that the deformation of the lower bearing holder 70 is suppressed and the rotation of the shaft 11 can be stabilized.
　図３は、本実施形態の下側ベアリングホルダ７０に対して、さらに加工を施した後の図である。図３に示すように、本実施形態の下側ベアリングホルダ７０において、下側ベアリング１６の外輪を固定する加工を施してもよい。この構成によれば、樹脂部７５は、筒部７１において第１底板部７２よりも上側から径方向内側に延びる第２底板部７１ａを有する。第２底板部７１ａは、例えば、筒部７１の上端部を加熱し軟化させた後、当該軟化した上端部を径方向内側に倒し、再度当該径方向内側に倒した部位を硬化させることで成形される。第２底板部７１ａは、下側ベアリング１６の外輪の上面に接触する。これにより、下側ベアリングホルダ７０は、下側ベアリング１６が上側に移動することを制限する。この構成によれば、下側ベアリング１６の外輪が第１底板部７２と第２底板部７１ａとによって挟まれる。したがって、下側ベアリング１６が下側ベアリングホルダ７０に対し軸方向にガタつくことを抑制できる。
　なお、樹脂部７５を加熱して軟化させることで第２底板部７１ａを成形する場合、樹脂部７５を構成する樹脂材料としては、熱可塑性樹脂が採用される。 FIG. 3 is a view after the lower bearing holder 70 of the present embodiment is further processed. As shown in FIG. 3, the lower bearing holder 70 of the present embodiment may be processed to fix the outer ring of the lower bearing 16. According to this configuration, the resin portion 75 has a second bottom plate portion 71a extending radially inward from the upper side of the first bottom plate portion 72 in the tubular portion 71. The second bottom plate portion 71a is formed by, for example, heating and softening the upper end portion of the tubular portion 71, then tilting the softened upper end portion inward in the radial direction, and curing the portion tilted inward in the radial direction again. Will be done. The second bottom plate portion 71a comes into contact with the upper surface of the outer ring of the lower bearing 16. As a result, the lower bearing holder 70 restricts the lower bearing 16 from moving upward. According to this configuration, the outer ring of the lower bearing 16 is sandwiched between the first bottom plate portion 72 and the second bottom plate portion 71a. Therefore, it is possible to prevent the lower bearing 16 from rattling in the axial direction with respect to the lower bearing holder 70.
When the second bottom plate portion 71a is molded by heating and softening the resin portion 75, a thermoplastic resin is adopted as the resin material constituting the resin portion 75.
　次に、上述の実施形態の変形例について説明する。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。
　＜変形例１＞
　図４は、変形例１の下側ベアリングホルダ１７０の部分断面図である。以下、図４を基に、変形例１の下側ベアリングホルダ１７０ついて説明する。 Next, a modified example of the above-described embodiment will be described. The components having the same aspects as those of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.
<Modification example 1>
FIG. 4 is a partial cross-sectional view of the lower bearing holder 170 of the modified example 1. Hereinafter, the lower bearing holder 170 of the first modification will be described with reference to FIG.
　本変形例の下側ベアリングホルダ１７０は、上述の実施形態と比較して、筒部１７１の内周面にシール部材１７１ｃが設けられる点が主に異なる。 The lower bearing holder 170 of this modification is mainly different from the above-described embodiment in that the seal member 171c is provided on the inner peripheral surface of the tubular portion 171.
　下側ベアリングホルダ１７０の樹脂部７５は、筒部１７１を有する。筒部１７１は、中心軸Ｊを中心とする円筒状である。筒部１７１の径方向内側には、下側ベアリング１６が配置される。すなわち、筒部１７１は、下側ベアリング１６を径方向外側から囲む。 The resin portion 75 of the lower bearing holder 170 has a tubular portion 171. The tubular portion 171 has a cylindrical shape centered on the central axis J. A lower bearing 16 is arranged inside the tubular portion 171 in the radial direction. That is, the tubular portion 171 surrounds the lower bearing 16 from the outside in the radial direction.
　筒部１７１の内周面には、周方向に沿って延びる２つの凹溝１７１ｂが設けられる。２つの凹溝１７１ｂには、それぞれ環状のシール部材１７１ｃが配置される。すなわち、下側ベアリングホルダ１７０は、シール部材１７１ｃを有する。シール部材１７１ｃは、凹溝１７１ｂの底面と、外輪の外周面に挟まれて圧縮される。本変形例においてシール部材１７１ｃは、Ｏリングである。 Two concave grooves 171b extending along the circumferential direction are provided on the inner peripheral surface of the tubular portion 171. An annular seal member 171c is arranged in each of the two concave grooves 171b. That is, the lower bearing holder 170 has a seal member 171c. The seal member 171c is sandwiched between the bottom surface of the concave groove 171b and the outer peripheral surface of the outer ring and compressed. In this modification, the seal member 171c is an O-ring.
　本変形例によれば、圧縮されたシール部材１７１ｃが筒部１７１の内周面と外輪の外周面との間に配置される。圧縮されたシール部材１７１ｃの反力は、下側ベアリング１６の外輪を径方向内側に押し付ける。結果的に、下側ベアリングホルダ１７０に対して下側ベアリング１６がガタつくことを抑制できる。 According to this modification, the compressed seal member 171c is arranged between the inner peripheral surface of the tubular portion 171 and the outer peripheral surface of the outer ring. The reaction force of the compressed seal member 171c presses the outer ring of the lower bearing 16 inward in the radial direction. As a result, it is possible to prevent the lower bearing 16 from rattling with respect to the lower bearing holder 170.
　＜変形例２＞
　図５は、変形例２の下側ベアリングホルダ２７０の部分断面図である。以下、図５を基に、変形例２の下側ベアリングホルダ２７０ついて説明する。 <Modification 2>
FIG. 5 is a partial cross-sectional view of the lower bearing holder 270 of the modified example 2. Hereinafter, the lower bearing holder 270 of the modification 2 will be described with reference to FIG.
　本変形例の下側ベアリングホルダ２７０は、上述の実施形態と比較して、金属ホルダ部２７６を有する点が主に異なる。 The lower bearing holder 270 of this modification is mainly different in that it has a metal holder portion 276 as compared with the above-described embodiment.
　本変形例の下側ベアリングホルダ２７０は、樹脂からなる樹脂部２７５と、樹脂部２７５に埋め込まれるバスバー８０および金属ホルダ部２７６と、を有する。 The lower bearing holder 270 of this modification has a resin portion 275 made of resin, a bus bar 80 embedded in the resin portion 275, and a metal holder portion 276.
　金属ホルダ部２７６は、金属製である。金属ホルダ部２７６は、金属筒部２７９と、金属筒部２７９の下側の端部から径方向内側に延びる金属底板部２７７と、金属筒部２７９の上側の端部から径方向外側に延びる鍔部２７８と、を有する。 The metal holder portion 276 is made of metal. The metal holder portion 276 includes a metal cylinder portion 279, a metal bottom plate portion 277 extending radially inward from the lower end portion of the metal cylinder portion 279, and a collar extending radially outward from the upper end portion of the metal cylinder portion 279. It has a part 278 and.
　鍔部２７８の径方向外側の縁部は、樹脂部２７５に埋め込まれる。これにより、金属ホルダ部２７６は、樹脂部２７５に保持される。鍔部２７８は、樹脂部２７５に埋め込まれる埋込領域２７８ａと、樹脂部２７５から露出する露出領域２７８ｂと、を有する。露出領域２７８ｂは、埋込領域２７８ａに対して径方向内側に位置する。埋込領域２７８ａおよび露出領域２７８ｂは、それぞれ鍔部２７８の上面および下面に設けられる。 The radial outer edge of the collar 278 is embedded in the resin portion 275. As a result, the metal holder portion 276 is held by the resin portion 275. The collar portion 278 has an embedded region 278a embedded in the resin portion 275 and an exposed region 278b exposed from the resin portion 275. The exposed region 278b is located radially inward with respect to the embedded region 278a. The embedded region 278a and the exposed region 278b are provided on the upper surface and the lower surface of the collar portion 278, respectively.
　樹脂部２７５を成形する金型は、露出領域２７８ｂにおいて鍔部２７８を上下から挟む。これにより、金型は、金属ホルダ部２７６を支持する。本変形例によれば、鍔部２７８の上下面に露出領域２７８ｂが設けられることで、金型内で金属ホルダ部２７６を強固に保持するとともに、金型に対して金属ホルダ部２７６を高精度で位置決めすることができる。結果的に、樹脂部２７５に対する金属ホルダ部２７６の位置精度を高めることができる。 The mold for molding the resin portion 275 sandwiches the collar portion 278 from above and below in the exposed region 278b. As a result, the mold supports the metal holder portion 276. According to this modification, by providing the exposed area 278b on the upper and lower surfaces of the flange portion 278, the metal holder portion 276 is firmly held in the mold, and the metal holder portion 276 is highly accurate with respect to the mold. Can be positioned with. As a result, the positional accuracy of the metal holder portion 276 with respect to the resin portion 275 can be improved.
　金属筒部２７９は、中心軸Ｊを中心とする円筒状である。金属筒部２７９の径方向内側には、下側ベアリング１６が配置される。すなわち、金属筒部２７９は、下側ベアリング１６を径方向外側から囲む。これにより、下側ベアリング１６は、径方向において下側ベアリングホルダ２７０に位置決めされる。 The metal cylinder portion 279 has a cylindrical shape centered on the central axis J. A lower bearing 16 is arranged inside the metal cylinder portion 279 in the radial direction. That is, the metal cylinder portion 279 surrounds the lower bearing 16 from the outside in the radial direction. As a result, the lower bearing 16 is positioned on the lower bearing holder 270 in the radial direction.
　金属底板部２７７は、下側ベアリング１６の外輪の下側を覆う。金属底板部２７７と下側ベアリング１６の外輪との間には、弾性部材２９０が設けられる。本変形例において弾性部材２９０は、ウェーブワッシャである。弾性部材２９０は、下側ベアリング１６の外輪に対して予圧を付与し、下側ベアリング１６のがたつきを抑制する。金属底板部２７７には、軸方向に貫通する中央孔２７７ａが設けられる。中央孔２７７ａには、シャフト１１が挿通される。 The metal bottom plate portion 277 covers the lower side of the outer ring of the lower bearing 16. An elastic member 290 is provided between the metal bottom plate portion 277 and the outer ring of the lower bearing 16. In this modification, the elastic member 290 is a wave washer. The elastic member 290 applies a preload to the outer ring of the lower bearing 16 to suppress rattling of the lower bearing 16. The metal bottom plate portion 277 is provided with a central hole 277a penetrating in the axial direction. The shaft 11 is inserted through the central hole 277a.
　本変形例によれば、金属ホルダ部２７６は、下側ベアリング１６を保持する。すなわち、樹脂部２７５は、金属製の金属ホルダ部２７６を介して下側ベアリング１６を保持する。このため、下側ベアリング１６を介してシャフト１１から下側ベアリングホルダ２７０に荷重が加わった場合であっても下側ベアリングホルダ２７０の変形を抑制できシャフト１１の保持の安定性を高めることができる。 According to this modification, the metal holder portion 276 holds the lower bearing 16. That is, the resin portion 275 holds the lower bearing 16 via the metal holder portion 276 made of metal. Therefore, even when a load is applied from the shaft 11 to the lower bearing holder 270 via the lower bearing 16, deformation of the lower bearing holder 270 can be suppressed and the holding stability of the shaft 11 can be improved. ..
　樹脂部２７５は、鍔部２７８の埋込領域２７８ａを埋め込む鍔保持部２７２と、鍔保持部２７２の外縁から下側に延びる包囲筒部（筒部）２７１と、包囲筒部２７１の下側の端部から径方向外側に延びるフランジ部２７３と、フランジ部２７３から上側に突出する環状部２７４と、を有する。樹脂部２７５は、フランジ部２７３においてバスバー８０を埋め込む。 The resin portion 275 includes a flange holding portion 272 that embeds the embedded region 278a of the flange portion 278, a surrounding cylinder portion (cylinder portion) 271 that extends downward from the outer edge of the flange holding portion 272, and a lower side of the surrounding cylinder portion 271. It has a flange portion 273 extending radially outward from the end portion, and an annular portion 274 protruding upward from the flange portion 273. The resin portion 275 embeds the bus bar 80 in the flange portion 273.
　包囲筒部２７１は、中心軸Ｊを中心として軸方向に延びる筒状である。包囲筒部２７１は、金属筒部２７９を径方向外側から隙間を介して囲む。包囲筒部２７１は、上端部において鍔保持部２７２に接続され、下端部においてフランジ部２７３に接続される。したがって、包囲筒部２７１は、鍔保持部２７２とフランジ部２７３とをクランク状に繋ぐ。 The surrounding cylinder portion 271 has a tubular shape extending in the axial direction about the central axis J. The surrounding cylinder portion 271 surrounds the metal cylinder portion 279 from the outside in the radial direction through a gap. The surrounding cylinder portion 271 is connected to the flange holding portion 272 at the upper end portion and is connected to the flange portion 273 at the lower end portion. Therefore, the surrounding cylinder portion 271 connects the flange portion 272 and the flange portion 273 in a crank shape.
　下側ベアリングホルダ２７０は、フランジ部２７３においてハウジング３０に固定される。フランジ部２７３には、ハウジング３０に固定する過程で径方向に沿う応力が加わる場合がある。例えば、フランジ部２７３を熱かしめによってハウジング３０に固定する場合、フランジ部２７３には、径方向に沿う熱応力が加わる。本変形例の樹脂部２７５は、径方向内側に向かってフランジ部２７３、包囲筒部２７１および鍔保持部２７２がクランク状に湾曲する。このため、フランジ部２７３に加わった径方向の応力をクランク形状の弾性変形により吸収して、下側ベアリング１６に伝わることを抑制できる。結果的に、フランジ部２７３をハウジング３０に固定することにより発生する応力により下側ベアリング１６が変形することを抑制できる。 The lower bearing holder 270 is fixed to the housing 30 at the flange portion 273. Stress along the radial direction may be applied to the flange portion 273 in the process of fixing to the housing 30. For example, when the flange portion 273 is fixed to the housing 30 by heat caulking, thermal stress is applied to the flange portion 273 along the radial direction. In the resin portion 275 of this modified example, the flange portion 273, the surrounding cylinder portion 271 and the flange holding portion 272 are curved in a crank shape toward the inside in the radial direction. Therefore, the radial stress applied to the flange portion 273 can be absorbed by the elastic deformation of the crank shape and suppressed from being transmitted to the lower bearing 16. As a result, it is possible to prevent the lower bearing 16 from being deformed by the stress generated by fixing the flange portion 273 to the housing 30.
　フランジ部２７３は、包囲筒部２７１から径方向外側に延びる。フランジ部２７３は、中心軸Ｊを中心とし軸方向を板厚方向する円板状である。フランジ部２７３の内部には、バスバー８０の一部が埋め込まれる。フランジ部２７３は、バスバー８０が埋め込まれることで補強されている。 The flange portion 273 extends radially outward from the surrounding cylinder portion 271. The flange portion 273 has a disk shape with the central axis J as the center and the axial direction in the plate thickness direction. A part of the bus bar 80 is embedded in the flange portion 273. The flange portion 273 is reinforced by embedding the bus bar 80.
　環状部２７４は、中心軸Ｊを中心として周方向に沿ってリブ状に延びる。上述の実施形態と同様に、環状部２７４は、ハウジング３０の保持壁部３９（図１参照）の内側に嵌ることで、ハウジング３０に対して径方向に位置決めされる。 The annular portion 274 extends in a rib shape along the circumferential direction about the central axis J. Similar to the above-described embodiment, the annular portion 274 is radially positioned with respect to the housing 30 by fitting inside the holding wall portion 39 (see FIG. 1) of the housing 30.
　以上に、本発明の一実施形態およびその変形例を説明したが、実施形態および変形例における各構成およびそれらの組み合わせ等は一例であり、本発明の趣旨から逸脱しない範囲内で、構成の付加、省略、置換およびその他の変更が可能である。また、本発明は実施形態によって限定されることはない。 Although one embodiment of the present invention and a modification thereof have been described above, each configuration and a combination thereof in the embodiment and the modified example are examples, and the configuration is added within a range not deviating from the gist of the present invention. , Omission, replacement and other changes are possible. Moreover, the present invention is not limited to the embodiments.
　例えば、上述した実施形態およびその変形例のモータの用途は、特に限定されない。上述した実施形態およびその変形例のモータは、例えば、電動ポンプ、および電動パワーステアリング等に搭載される。 For example, the use of the motor of the above-described embodiment and its modified example is not particularly limited. The motors of the above-described embodiment and its modifications are mounted on, for example, an electric pump, an electric power steering, and the like.
　１…モータ、１０…ロータ、１６…下側ベアリング（ベアリング）、２０…ステータ、２８…引出線、２９…コイル、３０…ハウジング、３９ａ…取付内周面、７０…下側ベアリングホルダ（ベアリングホルダ）、７１，１７１…筒部、７１ａ…第２底板部、７２…第１底板部、７３，２７３…フランジ部、７４，２７４…環状部、７４ａ…外周面、７５，２７５…樹脂部、８０…バスバー、１７１ｃ…シール部材、２７１…包囲筒部（筒部）、２７２…鍔保持部、２７６…金属ホルダ部、２７７…金属底板部、２７８…鍔部、２７８ａ…埋込領域、２７８ｂ…露出領域、２７９…金属筒部、２９０…弾性部材、Ｊ…中心軸 1 ... motor, 10 ... rotor, 16 ... lower bearing (bearing), 20 ... stator, 28 ... leader wire, 29 ... coil, 30 ... housing, 39a ... mounting inner peripheral surface, 70 ... lower bearing holder (bearing holder) ), 71,171 ... Cylinder part, 71a ... Second bottom plate part, 72 ... First bottom plate part, 73,273 ... Flange part, 74,274 ... Ring part, 74a ... Outer surface surface, 75,275 ... Resin part, 80 ... Bus bar, 171c ... Seal member, 271 ... Surrounding cylinder (cylinder), 272 ... Bearing holding part, 276 ... Metal holder, 277 ... Metal bottom plate, 278 ... Bearing, 278a ... Embedded area, 278b ... Exposed Region 279 ... Metal cylinder, 290 ... Elastic member, J ... Central axis

Claims (11)

  1. 　中心軸周りに回転するロータと、
    　前記ロータと径方向に対向するステータと、
    　樹脂からなり前記ステータが埋め込まれるハウジングと、
    　前記ステータに対して前記ロータを回転可能に支持するベアリングと、
    　前記ベアリングを保持するベアリングホルダと、を有し、
    　前記ベアリングホルダは、
    　　樹脂からなり前記ベアリングを保持する樹脂部と、
    　　前記ステータのコイルと電気的に接続されるバスバーと、を有し、
    　前記バスバーが、前記樹脂部に埋め込まれる、モータ。     A rotor that rotates around the central axis and
    A stator facing the rotor in the radial direction and
    A housing made of resin and in which the stator is embedded,
    A bearing that rotatably supports the rotor with respect to the stator,
    Has a bearing holder for holding the bearing,
    The bearing holder
    A resin part made of resin that holds the bearing,
    It has a bus bar that is electrically connected to the coil of the stator.
    A motor in which the bus bar is embedded in the resin portion.
  2. 　前記ベアリングホルダは、前記樹脂部に埋め込まれる金属ホルダ部を有し、
    　前記樹脂部は、前記金属ホルダ部を介して前記ベアリングを保持する、請求項１に記載のモータ。     The bearing holder has a metal holder portion embedded in the resin portion.
    The motor according to claim 1, wherein the resin portion holds the bearing via the metal holder portion.
  3. 　前記金属ホルダ部は、
    　　前記ベアリングを径方向外側から囲む金属筒部と、
    　　前記金属筒部における軸方向一方側の端部から径方向外側に延びる鍔部と、を有し、
    　前記鍔部は、
    　　前記樹脂部に埋め込まれる埋込領域と、
    　　前記埋込領域に対して径方向内側に位置し前記樹脂部から露出する露出領域と、を有する、請求項２に記載のモータ。     The metal holder portion is
    A metal cylinder that surrounds the bearing from the outside in the radial direction,
    The metal cylinder portion has a flange portion extending radially outward from an end portion on one side in the axial direction.
    The collar is
    The embedded area embedded in the resin portion and
    The motor according to claim 2, further comprising an exposed region located radially inside the embedded region and exposed from the resin portion.
  4. 　前記樹脂部は、
    　　前記鍔部が埋め込まれる鍔保持部と、
    　　前記鍔保持部の外縁から軸方向他方側に延び前記金属筒部を径方向外側から隙間を介して囲む包囲筒部と、
    　　前記包囲筒部における軸方向他方側の端部から径方向外側に延びるフランジ部と、を有する、請求項３に記載のモータ。     The resin part is
    A collar holding part in which the collar part is embedded and
    A surrounding cylinder portion that extends from the outer edge of the collar holding portion to the other side in the axial direction and surrounds the metal cylinder portion from the radial outside through a gap.
    The motor according to claim 3, further comprising a flange portion extending radially outward from an end portion on the other side in the axial direction of the surrounding cylinder portion.
  5. 　前記金属ホルダ部は、前記金属筒部における軸方向他方側の端部から径方向内側に延びる金属底板部を有し、
    　前記ベアリングの外輪と前記金属底板部との間には、弾性部材が設けられる、請求項３又は４に記載のモータ。     The metal holder portion has a metal bottom plate portion extending radially inward from the end portion on the other side in the axial direction of the metal cylinder portion.
    The motor according to claim 3 or 4, wherein an elastic member is provided between the outer ring of the bearing and the metal bottom plate portion.
  6. 　前記弾性部材は、ウェーブワッシャである、請求項５に記載のモータ。 The motor according to claim 5, wherein the elastic member is a wave washer.
  7. 　前記樹脂部は、
    　　前記ベアリングを径方向外側から囲む筒部と、
    　　前記筒部から径方向外側に延びて前記ハウジングに固定されるフランジ部と、を有する、
    請求項１～６の何れか一項に記載のモータ。     The resin part is
    A tubular portion that surrounds the bearing from the outside in the radial direction,
    It has a flange portion extending radially outward from the tubular portion and fixed to the housing.
    The motor according to any one of claims 1 to 6.
  8. 　前記フランジ部は、前記筒部における軸方向中央部から径方向外側に延びる、請求項７に記載のモータ。 The motor according to claim 7, wherein the flange portion extends radially outward from the axial central portion of the tubular portion.
  9. 　前記樹脂部は、前記フランジ部から軸方向一方側に突出する環状部を有し、
    　前記環状部の外周面は、全周に亘って、前記ハウジングに設けられた径方向内側を向く取付内周面と接する、請求項７又は８に記載のモータ。     The resin portion has an annular portion that protrudes from the flange portion to one side in the axial direction.
    The motor according to claim 7 or 8, wherein the outer peripheral surface of the annular portion is in contact with the mounting inner peripheral surface provided on the housing and facing inward in the radial direction over the entire circumference.
  10. 　前記環状部は、前記フランジ部の外縁より内側に位置する、請求項９に記載のモータ。 The motor according to claim 9, wherein the annular portion is located inside the outer edge of the flange portion.
  11. 　前記環状部は、前記筒部と径方向に隙間を介して対向する、請求項９又は１０に記載のモータ。 The motor according to claim 9 or 10, wherein the annular portion faces the tubular portion with a gap in the radial direction.
PCT/JP2020/006703 2019-03-28 2020-02-20 Motor WO2020195396A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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