MOTOR

Abstract

Motor (10) which has the following features: a motor body section (11) which has the following features: a rotor (30) with a shaft (31) whose center is located on a central axis extending in one direction; a stator (40) that surrounds the rotor and rotates the rotor about the central axis; a first bearing (51) which is arranged on a first side in one direction of the stator and supports the shaft; a second bearing (52) arranged on a second side opposite the first side of the stator and supporting the shaft, the second bearing (52) being held by a return bearing retaining section (65) of a busbar support (61), the busbar support (61) comprising a main body section (62), a connector section (63), a connection terminal retaining section (64), the return bearing retaining section (65), and a circuit board support section (67), wherein at least one circuit board support section (67) supports the circuit board (71); and a housing (20) with a space for housing the rotor, the stator, the first bearing and the second bearing; the connector section (63) which is arranged to the motor body section; and a wiring component that is electrically connected to the motor body section, wherein the connector section has an exposed surface that is exposed to an exterior of the motor body section, the wiring component has a plurality of external connection terminals that are connected to an external power supply and protrude from the exposed surface of the connector section, the connector section is provided with a through-hole extending from the exposed surface towards the housing space, allowing the exterior of the motor body section and the housing space to communicate with each other, and When viewing the exposed surface from a normal direction, at least one section of the through-hole is positioned within an outer edge of an external connection group formed from the plurality of external connection terminals; wherein the motor body section (11) further comprises the following: a main body section (62) which is connected to the connector section (63); a groove section (62f) which is provided along the contour of the main body section (62) on the second side; a first sealing section (81) arranged between the main body section (62) and the housing (20); and a second sealing section (82) which is arranged in the groove section (62f); and the through-hole is arranged in the axial direction between the first sealing section (81) and the second sealing section (82).

Description

[0001] The present disclosure relates to an engine.

[0002] In the past, a motor was known that had an air hole that allowed the interior and exterior of a housing body to communicate with each other through an opening provided at a connector portion. This motor was provided with a pair of terminals exposed within the connector portion.

[0003] The above-described connector portion of the motor is often provided on the exterior of the housing body. Therefore, sealing is required between the connector portion and an external power supply connected to the connector portion.

[0004] In the above-described motor, the connector portion may be formed using a mold. The mold is provided with, for example, a mold pin for forming the air hole. However, it is difficult to form the mold pin integrally with the mold by machining. Therefore, the mold pin is usually provided as a separate component from a mold body portion. When the mold pin and the mold are separate components, the mold pin may be fixed to the mold body portion using a method such as welding or by inserting the mold pin into a concave portion provided on the mold body portion.

[0005] When the connector portion of the motor is provided with a plurality of terminals, as disclosed in Patent Literature 1, in most cases, the air hole is provided relatively close to an outer edge of the connector portion. When the air hole is provided close to the outer edge of the connector portion, a configuration in which the mold pin is inserted into the concave portion of the mold body portion is usually adopted. In this case, the concave portion must be provided close to an outer edge of the mold body portion. Accordingly, the thickness of the region of the mold body where the concave portion is provided becomes thinner, which in turn may reduce the strength of the mold. Therefore, in the mold for forming the connector portion, when the air hole is provided relatively close to an outer edge of the connector portion, in most cases, the mold pin is fixed to the mold body portion by welding.

[0006] The publication JP 2013 - 211 978 A refers to an electric motor that can be ventilated with ambient air, but where water must be prevented from entering the motor.

[0007] The document JP 2011 - 179 658 A relates to an electric motor housing provided with a cylindrical yoke at one open end and a resin brush holder arranged to close the open end of the yoke.

[0008] The document US 2017 / 0 066 470 A1 relates to an integrated electric power steering device in which a motor unit and a control unit are integrated with each other in one direction.

[0009] The document JP 2001 - 128 407 A relates to an electric window regulator device of a vehicle with a ventilation structure for eliminating the relative pressure difference between the inside and the outside of the motor unit.

[0010] However, when the mold pin is fixed to the mold body portion by welding, unevenness may occur on the mold body portion due to the welded portion. Due to this unevenness formed on the mold body portion, unevenness may also occur on the molded connector portion. Furthermore, there is a possibility that the unevenness may deteriorate the sealability between the connector portion and the external power supply connected to the connector portion.

[0011] The object of the present invention is to provide an engine with improved characteristics.

[0012] This object is achieved by a motor according to claim 1.

[0013] One embodiment of the present disclosure is a motor including a motor body portion; a connector portion provided on the motor body portion; and a wiring member electrically connected to the motor body portion. The motor body portion includes: a rotor; a stator; a first bearing; a second bearing; and a housing. The rotor includes a shaft whose center is located on a central axis extending in one direction. The stator encloses the rotor to rotate the rotor about the central axis. The first bearing is disposed on a first side of the stator in the one direction and supports the shaft. The second bearing is disposed on a second side of the stator, which is the opposite side from the first side of the stator, and supports the shaft. The housing includes an accommodation space for accommodating the rotor, the stator, the first bearing, and the second bearing.The connector portion has an exposed surface exposed to an exterior of the motor body portion. The wiring member includes a plurality of external connection terminals connected to the external power supply and protruding from the exposed surface of the connector portion. The connector portion is provided with a through-hole extending from the exposed surface toward the accommodation space, allowing the exterior of the motor body portion and the accommodation space to communicate with each other. When viewed in a normal direction of the exposed surface, at least a portion of the through-hole is located within an outer periphery of an external connection terminal group composed of the plurality of external connection terminals.

[0014] The above and other elements, features, steps, characteristics, and advantages of the present disclosure will become more apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings. Fig. 1 is a cross-sectional view of an engine according to a first exemplary embodiment of the present disclosure; Fig. 2 is a cross-sectional view illustrating a portion of the engine according to the first exemplary embodiment of the present disclosure; Fig. 3 is a diagram illustrating a connector portion according to the first exemplary embodiment of the present disclosure; Fig. 4 is a cross-sectional view illustrating a mold for molding a bus bar assembly according to the first exemplary embodiment of the present disclosure; Fig. 5 is a diagram schematically illustrating another example of an arrangement relationship between an air hole and an external connection terminal group in the first exemplary embodiment of the present disclosure; Fig. 6 is a diagram illustrating a connector portion according to a second exemplary embodiment of the present disclosure; and Fig. 7 is a cross-sectional view illustrating a mold for molding a bus bar assembly according to the second exemplary embodiment of the present disclosure.

[0015] Hereinafter, an engine according to an exemplary embodiment of the present disclosure will be described with reference to the accompanying drawings. Furthermore, the scope of the present disclosure is not limited to the following embodiments, but may be arbitrarily modified within the technical spirit of the present disclosure. Furthermore, for easy understanding of each component, in the following drawings, structures of an actual engine, components, etc., as well as a scale of each structure, the number of structures, etc., may be different.

[0016] In the drawings, an XYZ coordinate system is provided as a suitable three-dimensional orthogonal coordinate system. In the XYZ coordinate system, a direction parallel to the axial direction (one direction) of a central axis J, which is Fig. 1 is referred to as the Z-axis direction. A direction parallel to a length direction of a busbar assembly 60 shown in Fig. 1, that is, the left-right direction in Fig. 1, is referred to as the X-axis direction. A direction parallel to a width direction of the busbar assembly 60, that is, a direction perpendicular to both the X-axis direction and the Z-axis direction, is referred to as the Y-axis direction.

[0017] In the following description, a positive side of the Z-axis direction (+Z side, a second side) is defined as the "back side," and a negative side of the Z-axis direction (-Z side, a first side) is defined as the "front side." Please note that the descriptions of the back side and the front side are used for explanatory purposes only and do not limit the actual positional relationship or direction. Furthermore, unless otherwise stated, a direction parallel to the central axis J (Z-axis direction) is simply referred to as the "axial direction," a radial direction centered on the central axis J is simply referred to as the "radial direction," and a circumferential direction centered on the central axis J, i.e., the axial circumference of the central axis J (θZ direction), is simply referred to as the "circumferential direction."

[0018] Furthermore, descriptions herein such as "extends axially" refer not only to a case of strictly extending in the axial direction (Z-axis direction), but may also include a case of extending in a direction inclined at less than 45° relative to the axial direction. Furthermore, descriptions such as "extends radially" refer not only to a case of strictly extending in the radial direction, that is, the direction perpendicular to the axial direction (Z-axis direction), but may also include a case of extending in a direction inclined at less than 45° relative to the radial direction.

[0019] Fig. 1 is a cross-sectional view of an engine 10 according to this embodiment. Fig. Fig. 2 illustrates a portion of the engine 10 according to this embodiment and is a partially enlarged cross-sectional view of Fig. 1. Fig. 3 illustrates a connector portion 63 and is viewed from a normal direction (X-axis direction) of a lower surface 63b of a concave connector portion 63a.

[0020] In the following description, unless otherwise stated, the normal direction refers to the normal line (X-axis direction) of the lower surface 63b.

[0021] Motor 10 is a brushless motor. As shown in Fig. 1, the motor 10 includes a housing 20, a rotor 30 with a shaft 31, a stator 40, a first bearing 51, a second bearing 52, a controller 70 with a circuit board 71, a bus bar assembly 60, a front O-ring 81, a rear O-ring 82, and an oil seal 80. The bus bar assembly 60 preferably includes the connector bar 63.

[0022] The motor 10 preferably includes a motor body portion 11. The motor body portion 11 includes the housing 20, the rotor 30, the stator 40, the first bearing 51, the second bearing 52, the control device 70, the busbar assembly 60 except the connector portion 63, the front-side O-ring 81, the rear-side O-ring 82, and the oil seal 80. In the following description, a portion in the motor 10 other than the connector portion 63 of the busbar assembly 60 is referred to as the motor body portion 11.

[0023] The housing 20 houses each portion of the motor body portion 11. The busbar assembly 60 is disposed at a rear side (+Z side) of the rotor 30 and the stator 40. In the busbar assembly 60, the connector portion 63 is exposed outside the housing 20. The busbar assembly 60 supports the second bearing 52. The housing 20 supports the first bearing 51. Both ends in an axial direction (Z-axis direction) of the shaft 31 are supported by the first bearing 51 and the second bearing 52.

[0024] The housing 20 has a housing space ARC1. The housing space ARC1 accommodates the rotor 30, the stator 40, the first bearing 51, and the second bearing 52. A material of the housing 20 is, for example, a metal. The housing 20 has a housing body 21 and a cover 22.

[0025] Furthermore, in the following description, "accommodated in an accommodation space" includes the case where a target is held in the state within the accommodation space in which a portion of the target to be accommodated is positioned outside the accommodation space, in addition to the case where the entire target to be accommodated is positioned within the accommodation space.

[0026] The housing body 21 is a cylindrical member and holds the stator 40 and the first bearing 51. According to this embodiment, the housing body 21 has a multi-stage cylindrical shape with open ends on both sides.

[0027] The housing body 21 includes a front flange portion 23, a busbar assembly insertion portion 21a, a stator holding portion 21b, a front bearing holding portion 21c, and an oil seal holding portion 21d. The front flange portion 23, the busbar assembly insertion portion 21a, the stator holding portion 21b, the front bearing holding portion 21c, and the oil seal holding portion 21d are arranged in an order from the rear (+Z side) toward a front (-Z side). This means that in the housing body 21, the front flange portion 23 is arranged on a rearmost side, and the oil seal holding portion 21d is arranged on a frontmost side. The busbar assembly insertion portion 21a, the stator holding portion 21b, the front bearing holding portion 21c, and the oil seal holding portion 21d each have a concentric cylindrical shape.A diameter of these components decreases in an order of the busbar assembly insertion portion 21a, the stator holding portion 21b, the front bearing holding portion 21c, and the oil seal holding portion 21d.

[0028] The front flange portion 23 expands from a rear side (+Z side) of the busbar assembly insertion portion 21a toward a radially outer side.

[0029] The busbar assembly insertion portion 21a encloses one end of a front side (-Z side) of the busbar assembly 60 from the radially outer side of the center axis J. In other words, at least a portion of the end of the front side (-Z side) of the busbar assembly 60 is disposed within the busbar assembly insertion portion 21a.

[0030] The stator 40 is held by the stator holding portion 21b. The front bearing holding portion 21c holds the first bearing 51. The oil seal holding portion 21d holds the oil seal 80.

[0031] The cover 22 is attached to a rear side (+Z side) of the housing body 21. The cover 22 has a cover cylinder shape portion 22a, a lid portion 22b, and a rear flange portion 24.

[0032] The cover cylinder shape portion 22a has a cylindrical shape that is open toward the front side (-Z side). The cover cylinder shape portion 22a encloses an end portion at the rear side (+Z side) of the busbar assembly 60 from the radially outer side. The cover cylinder shape portion 22a is connected to an end portion at a rear side of the busbar assembly insertion portion 21a by the front side flange portion 23 and the rear side flange portion 24.

[0033] The lid portion 22b is connected to an end portion on a rear side (+Z side) of the cover cylinder-shaped portion 22a. The lid portion 22b has, for example, a plate shape. The rear flange portion 24 extends from one end of a front side (-Z side) of the cover cylinder-shaped portion 22a toward the radially outer side. The front flange portion 23 and the rear flange portion 24 are bonded to each other while overlapping, so that the case body 21 is bonded to the cover 22.

[0034] The rotor 30 includes the shaft 31, a rotor core 32, and a rotor magnet 33. The shaft 31 has its center on the central axis J extending in one direction (Z-axis direction). According to this exemplary embodiment, the shaft 31 is a cylindrical member. Further, the shaft 31 may be solid or may also be a hollow cylindrical member. The shaft 31 is rotatably supported around the axis (in a ±θZ direction) by the first bearing 51 and the second bearing 52. The front end (-Z side) of the shaft 31 protrudes to the exterior of the housing body 21. In the oil seal holding portion 21d, the oil seal 80 is arranged around the axis of the shaft 31.

[0035] The rotor core 32 is an approximately cylindrical member. The rotor core 32 is fixed to the shaft 31 while enclosing the shaft 31 around the axis (in the θZ direction). More specifically, the rotor core 32 has a through-hole penetrating axially. At least a portion of the shaft 31 is disposed within the through-hole of the rotor core 32. The shaft 31 is fixed to the rotor core 32 by, for example, press fitting, adhesion, or the like. According to this exemplary embodiment, the rotor magnet 33 has an approximately annular shape. Furthermore, the shape of the rotor magnet 33 is not necessarily an annular shape. The rotor magnet 33 may be formed of a plurality of magnets arranged on an outer peripheral surface of the rotor core 32 in a circumferential direction.

[0036] The rotor magnet 33 is fixed to an outer surface of the rotor core 32 along an axial circumference of the rotor core 32. The rotor core 32 and the rotor magnet 33 rotate integrally with the shaft 31.

[0037] The stator 40 has a roughly cylindrical shape. The rotor 30 is positioned inside the stator 40. In other words, the stator 40 encloses the rotor 30 around the axis (in the θZ direction). The stator 40 rotates the rotor 30 around the central axis J. The stator 40 includes a core back portion 41, a plurality of tooth portions 42, a plurality of coils 43, and a plurality of coil bobbins 44. According to this exemplary embodiment, the core back portion 41 and the tooth portion 42 are formed from a stacked steel plate in which a plurality of electromagnetic steel plates are stacked.

[0038] A shape of the core back portion 41 is a cylindrical shape. Preferably, the shape of the core back portion 41 is concentric with the shaft 31. A plurality of tooth portions 42 are arranged on an inner side surface of the core back portion 41. Each tooth portion 42 extends from the inner side surface of the core back portion 41 toward a radially inner side (i.e., the shaft 31 side). Each tooth portion 42 is arranged at an equal interval in the circumferential direction of the inner side surface of the core back portion 41.

[0039] Preferably, the coil former 44 is a substantially cylindrical member. Each coil former 44 is fixed to a toothed portion 42. Preferably, the coil former 44 is formed from at least two members that are engaged from an axial direction. A coil 43 is disposed in each coil former 44. Each coil 43 is formed by winding a conductive wire 43a. Furthermore, a circular wire or a flat wire is preferably used as the conductive wire 43a.

[0040] The first bearing 51 is arranged at a front side (-Z side) of the stator 40. The first bearing 51 is held by the front bearing holding portion 21c. The second bearing 52 is arranged at the rear (+Z side) opposite the front side (-Z side) of the stator 40. The second bearing 52 is held by a rear bearing holding portion 65 of a bus bar holder 61, which will be described later.

[0041] The first bearing 51 and the second bearing 52 support the shaft 31 of the rotor 30. According to this exemplary embodiment, the first bearing 51 and the second bearing 52 are ball bearings. However, the type of the first bearing 51 and the second bearing 52 is not particularly limited to the same type of bearing. Therefore, different types of bearings, such as a journal bearing and a hydraulic fluid bearing, may also be used. Furthermore, the type of bearing of the first bearing 51 may be different from that of the second bearing 52.

[0042] The oil seal 80 is a substantially annular member. The oil seal 80 is fixed within the oil seal holding portion 21d around the axis (in the θZ direction) of the shaft 31. More specifically, the oil seal 80 is disposed within the oil seal holding portion 21d. One end of a lower axial portion of the shaft 31 penetrates through the through hole of the oil seal 80. The oil seal 80 is disposed between the oil seal holding portion 21d and the shaft 31. Thus, the oil seal 80 can suppress water, oil, etc., from entering the housing body 21 from a gap between the oil seal holding portion 21d and the shaft 31. The oil seal 80 is made of, for example, a resin material. However, a configuration and material of the oil seal 80 are not limited to this, and therefore, an oil seal with various types of configurations and materials can also be used.

[0043] The motor 10 includes a busbar support 61 and a wiring component electrically connected to the motor body portion 11. Specifically, the busbar assembly 60 is a unit that supplies a drive current from an external power supply, etc., to the stator 40. The busbar assembly 60 includes the busbar support 61 and a plurality of wiring components. The plurality of wiring components are electrically connected to the motor body portion 11.

[0044] According to this exemplary embodiment, as shown in Fig. 3, the wiring member includes a plurality of bus bars 91a, 91b and 91c and a plurality of circuit board connecting members 92a, 92b, 92c, 92d, 92e and 92f.

[0045] The busbars 91a, 91b, and 91c each have the same configuration except for different mounting positions. The circuit board connecting components 92a, 92b, 92c, 92d, 92e, and 92f each have the same configuration except for different mounting positions. Therefore, in the following description, only the busbar 91b and the circuit board connecting component 92d are representatively described.

[0046] As in Fig. As shown in FIG. 1, the busbar holder 61 is a holder made of resin. Preferably, a material constituting the busbar holder is an insulating resin. A rear side (+Z side) of the busbar holder 61 is housed in the cover cylinder shape portion 22a. At least a portion of a front side (-Z side) of the busbar holder 61 is housed in the busbar assembly insertion portion 21a.

[0047] As long as the material forming the busbar support 61 has insulating properties, any material can be used without any specific restrictions. The busbar support 61 is manufactured as a single component by injection molding, for example, using a mold 83, which will be described later.

[0048] The motor 10 includes the connector portion 63. The motor body portion 11 has a convex portion 69. More specifically, the bus bar support 61 includes a main body portion 62, the connector portion 63, a connection terminal holding portion 64, the return bearing holding portion 65, a circuit board support portion 67, a connecting portion 68, and the convex portion 69. The motor body portion 11 has the bus bar assembly 60 except the connector portion 63.

[0049] The main body portion 62 is cylindrical in shape with an opening 62a at the rear (+Z side) thereof and encloses the central axis J in the circumferential direction (θZ direction). The main body portion 62 encloses one end of a rear side of the rotor 30 and one end of a rear side of the stator 40 in the circumferential direction. An outer side surface of the main body portion 62 is provided with a front side O-ring holding portion 62e. A front side O-ring 81 is fitted into the front side O-ring holding portion 62e. The main body portion 62 receives a radially inward force from the casing body 21 and is pressed against the core rear portion 41. Thus, the body portion 62 is fixed to the stator 40.

[0050] A rear surface 62c of the main body portion is provided with a groove portion 62f. The groove portion 62f is provided along the outline of the main body portion 62, which encloses the opening 62a. A rear O-ring 82 is fitted into the groove portion 62f.

[0051] The main body portion 62 includes the connector connecting portion 66. The connector connecting portion 66 is connected to the connector portion 63 in the main body portion 62. A portion of the air hole 63c, which will be described in more detail in a subsequent section, is provided on the connector connecting portion 66.

[0052] The connector portion 63 is connected to an external power supply (not shown). The connector portion 63 is installed on the motor body portion 11. More specifically, the connector portion 63 extends from a portion of the outer side surface of the connector connecting portion 66 toward a radially outer side (+X side) of the central axis J. This means that the connector portion 63 protrudes radially outward from the motor body portion 11. According to this embodiment, the entire connector portion 63 protrudes to the exterior of the housing 20.

[0053] When the connector portion 63 extends in the axial direction (Z-axis direction), there is a case where external connection terminals 93a, 93b, 93c, which will be described later, of the busbars 91a, 91b, 91c and the circuit board connection members 92a, 92b, 92c, 92d, 92e, 92f need to be bent within the connector connection portion 66. In this case, at the time of molding the busbar assembly 60, the external connection terminals 93a, 93b, 93c of the busbars 91a, 91b, 91c and the circuit board connection members 92a, 92b, 92c, 92d, 92e, 92f are likely to interfere with a mold 85b, which will be described later.

[0054] In connection with this, according to this embodiment, when the connector portion 63 extends radially outward from the center axis J (+X side), the external connection terminals 93a, 93b, 93c of the busbars 91a, 91b, 91c and the circuit board connection members 92a, 92b, 92c, 92d, 92e, 92f can extend linearly within the connector connection portion 66. Therefore, at the time of molding the busbar assembly 60, the external connection terminals 93a, 93b, 93c of the busbars 91a, 91b, 91c and the circuit board connection members 92a, 92b, 92c, 92d, 92e, 92f can be suppressed from interfering with the mold 85b, which will be described later.

[0055] As in Fig. 2, the connector portion 63 includes a concave connector portion 63a open toward the exterior of the motor body portion 11. The concave connector portion 63a includes a bottom surface 63b and a side surface 63f. The bottom surface 63b is exposed to the exterior of the motor body portion 11. This means that the connector portion 63 includes the bottom surface 63b, which is a surface exposed to the exterior of the motor body portion 11. The bus bar 91b and the circuit board connecting member 92d protrude radially outward from the bottom surface 63b. The side surface 63f of the concave connector portion 63a is preferably a cylindrical surface. Furthermore, in this specification, the exterior of the motor body portion 11 includes the exterior of the housing 20.

[0056] The connector portion 63 is provided with the air hole 63c. The air hole 63 is a through hole extending from the bottom surface 63b toward the accommodation space ARC1. According to this embodiment, the air hole 63c extends in a normal direction (X-axis direction) of the bottom surface 63b. The air hole 63c passes through the connector connecting portion 66 in the normal direction of the bottom surface 63b. The air hole 63c has an outside opening 63d opened in the bottom surface 63b, which is exposed to the outside of the motor body portion 11, and an inside opening 63e opened into the accommodation space ARC1. Here, the air hole 63c allows the outside of the motor body portion 11 to communicate with the accommodation space ARC1.

[0057] The outer side opening 63d is preferably provided at a center of the lower surface 63b. A shape of the outer side opening 63d is not particularly limited, and therefore, the shape of the outer side opening 63d may be a circle, a semicircle, a rectangle, a polygon, etc. Fig. 3, the shape of the outer side opening 63d is a circular shape.

[0058] In Fig. 1, the inner side opening 63e is located on the front side (-Z side) in front of the circuit board 71. Although not shown, according to this embodiment, the shape of the inner side opening 63e is, for example, a circular shape. Like the outer side opening 63d, the shape of the inner side opening 63e is not particularly limited, and therefore, the shape of the inner side opening 63e can be a circular shape, a semicircular shape, a rectangular shape, a polygonal shape, etc.

[0059] According to this embodiment, the cross-sectional shape of the air hole 63c in a direction orthogonal to the direction in which the air hole 63c extends (X-axis direction) is identical regardless of its position. According to this embodiment, the cross-sectional shape of the air hole 63c in a direction orthogonal to the direction in which the air hole 63c extends is circular.

[0060] In addition, in the following description, the cross section orthogonal to the direction in which the air hole 63c extends is referred to merely as the cross section of the air hole 63c.

[0061] As in Fig. As shown in Figure 3, when the lower surface 63b is viewed from the normal direction (X-axis direction), at least a portion of the air hole 63c is located within an edge OE of an external connection terminal group 99, which will be described later. According to this embodiment, when the lower surface 63b is viewed from the normal direction, the entire air hole 63c is located within the edge OE.

[0062] In addition, in the following description, when the air hole is arranged on the inside or outside of the edge of the external connection terminal group, when viewed in the normal direction of the lower surface from which the external connection terminal group protrudes, it is easy to explain that the air hole is arranged on the inside or outside of the edge of the external connection terminal group.

[0063] As in Fig. As shown in Figure 1, the connection terminal holding portion 64 holds a circuit board connection terminal 95, which will be described later. The connection terminal holding portion 64 is approximately a rectangular parallelepiped shape and protrudes from the inner side surface 62b of the main body portion 62 toward the radially inner side. More specifically, the connection terminal holding portion 64 extends from the inner side surface of the connector connecting portion 66 in the direction (-X direction) opposite to the direction in which the connector portion 63 extends.

[0064] The rear bearing holding portion 65 is disposed on the radially inner side of the body portion 62. The rear bearing holding portion 65 holds the second bearing 52.

[0065] At least one circuit board support portion 67 supports the circuit board 71. According to this embodiment, a plurality of circuit board support portions 67 are installed. The circuit board support portion 67 protrudes, for example, from a rear surface (+Z side) of the connecting portion 68 or a rear surface of the rear bearing holding portion 65 toward the rear side.

[0066] At least one connecting portion 68 connects the main body portion 62 to the rear bearing holding portion 65. According to this embodiment, a plurality of connecting portions 68 are installed. The plurality of connecting portions 68 are arranged on a periphery of the rear bearing holding portion 65 at a distance in the circumferential direction. A gap 68a is formed between the connecting portions 68 adjacent to each other in the circumferential direction.

[0067] As in Fig. As shown in Figure 2, the convex portion 69 protrudes from a front surface of the connection terminal holding portion 64 toward the front side. The convex portion 69 faces the inner side opening 63e. When viewed from the normal direction (X-axis direction) of the lower surface 63b, the convex portion 69 completely overlaps the inner side opening 63e.

[0068] The busbar 91b is a thin plate-like member made of a conductive material (e.g., metal, etc.). As shown in Fig. 1, at least one busbar 91b is electrically connected to the stator 40 to supply a drive current from the external power supply, etc. to the stator 40. The busbar 91b has a busbar body portion 97, the external connection terminal 93b, and a stator connection terminal 96. Similarly, as shown in Fig. As shown in Figure 3, the busbar 91a has the external connection terminal 93a. The busbar 91c has the external connection terminal 93c.

[0069] The busbar body section 97, which is in Fig. 2 is a ring shape (not shown). The busbar body portion 97 encloses the accommodation space ARC1 in the circumferential direction. The busbar body portion 97 is held by the busbar holder 61. The busbar body portion 97 is preferably inserted into the main body portion 62.

[0070] The external connection terminal 93b extends linearly radially outward from the busbar body portion 97. According to this embodiment, the direction in which the external connection terminal 93b extends is the normal direction (X-axis direction) of the lower surface 63b. The external connection terminal 93b protrudes from the lower surface 63b. More specifically, the radially outer end of the external connection terminal 93b protrudes from the lower surface 63b. Thus, a portion of the external connection terminal 93b, that is, the radially outer end, is exposed to the exterior of the motor body portion 11. The portion of the external connection terminal 93b exposed to the exterior of the motor body portion 11 is connected to the external power supply, etc.

[0071] According to this exemplary embodiment, the stator connection terminal 96 is arranged to form a two-by-two busbar 91 (not shown). More specifically, the stator connection terminal 96 extends from a two-by-two busbar body portion 97. The busbar has three busbars 91a, 91b, and 91c. A total of six stator connection terminals are installed.

[0072] The stator connection terminal 96 is arranged on the radially inner side of the busbar body portion 97. The stator connection terminal 96 protrudes from the busbar support 61. The stator connection terminal 96 engages a coil wiring 98. The coil wiring 98 connects the coil 43 to the stator connection terminal 96 through the gap 68a. The busbar 91b is electrically connected to the stator 40. The coil wiring 98 may be a portion of the conductive wire 43a forming the coil 43 and may be a separate component from the conductive wire 43a forming the coil 43.

[0073] The circuit board connecting member 92d is held on the bus bar holder 61 while being partially inserted therein. The circuit board connecting member 92d electrically connects the external power supply (not shown) to the circuit board 71. The circuit board connecting member 92d has an external connection terminal 94d. Similarly, as shown in Fig. As shown in Figure 3, the circuit board connecting component 92a has an external connection terminal 94a. The circuit board connecting component 92b has an external connection terminal 94b. The circuit board connecting component 92c has an external connection terminal 94c. The circuit board connecting component 92e has an external connection terminal 94e. The circuit board connecting component 92f has an external connection terminal 94f.

[0074] Each of the external connection terminals 94a to 94f has the same configuration except that their positions are different. There is a case where only the external connection terminal 94d is representatively described.

[0075] As in Fig. 2, the external connection terminal 94d is exposed from the busbar support 61. More specifically, the external connection terminal 94d protrudes from the bottom surface 63b. This means that the external connection terminal 94d is exposed to the exterior of the motor body portion 11. The external connection terminal 94d is connected to the external power supply (not shown).

[0076] As in Fig. As shown in FIG. 1, the circuit board connection member 92d includes the circuit board connection terminal 95 connected to the circuit board 71. The circuit board connection terminal 95 is exposed above the accommodation space ARC1 of the bus bar holder 61. The circuit board connection terminal 95 protrudes from an inner side surface 64a of the holding portion toward the radially inner side. The inner side surface 64a of the holding portion is an inner side surface in the radial direction of the connection terminal holding portion 64. The circuit board connection terminal 95 is connected to a back surface 71a of the circuit board on the back (+Z side) of the circuit board 71.

[0077] As described above, the motor 10 includes a plurality of wiring components, that is, the busbars 91a, 91b, 91c and the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f. The busbars 91a, 91b, 91c include the external connection terminals 93a, 93b, 93c. The circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f include the external connection terminals 94a to 94f. This means that the wiring component includes the plurality of external connection terminals 93a, 93b, 93c, and 94a to 94f.

[0078] Furthermore, the total number of external connection connectors included in one or more wiring components may be multiple. This means that the wiring components may be installed in multiple configurations, and each wiring component may also have one or more external connection terminals. Only one wiring component may be installed, and the wiring component may have a plurality of external connection terminals.

[0079] As in Fig. As shown in Figure 3, the external connection terminals 93a, 93b, 93c are arranged in two lines parallel to the external connection terminals 94a to 94f. More specifically, the external connection terminals 94b to 94f of the circuit board connection members 92a to 92f are arranged in parallel along the Y-axis direction. The external connection terminal 94a of the circuit board connection member 92a is arranged parallel to the external connection terminals 93a, 93b, 93c of the bus bars 91a, 91b, 91c along the Y-axis direction, on the front side (-Z side) of the external connection terminals 94b to 94f.

[0080] The external connection terminal group 99 includes a plurality of external connection terminals. The external connection terminal group 99 is formed from the external connection terminals 93a, 93b, 93c of the bus bars 91a, 91b, 91c and the external connection terminals 94a to 94f of the circuit board connecting members 92a to 93f. According to this embodiment, the edge OE of the external connection terminal group 99 is rectangular in shape.

[0081] Further, when viewed in the normal direction of the surface from which the external connection terminal protrudes, the edge of the external connection terminal group may include an outline of a region of maximum area among regions enclosed by a portion of the edges of each of the external connection terminals, and a straight line connecting between the edges of each of the external connection terminals.

[0082] The control device 70 controls the driving of the motor 10. The control device 70 includes the circuit board 71, a rotation sensor 72, a sensor magnet holding member 73a, and a sensor magnet 73b. That is, the motor body portion 11 includes the circuit board 71.

[0083] The circuit board 71 is arranged on an extension line of the rear side (+Z side) of the shaft 31. The circuit board 71 is arranged between the second bearing 52 and the cover 22 in the axial direction (Z-axis direction). This means that the circuit board 71 is arranged on the rear side of the second bearing 52. The circuit board 71 is supported by the plurality of circuit board support sections 67 arranged within the bus bar holder 61.

[0084] A main surface of the circuit board 71 includes a front surface 71b of the circuit board on the front side (-Z side) and a back surface 71a of the circuit board on the back side (+Z side). According to this embodiment, the main surface of the circuit board 71 is orthogonal to the axial direction. The back surface 71a of the circuit board faces a front surface 22c of the cover.

[0085] At least one side of the main surface of the circuit board 71 is provided with printed wiring (not shown). The back surface 71a of the circuit board is connected to the circuit board connection terminal 95. The circuit board 71 outputs, for example, a motor drive signal, etc.

[0086] The sensor magnet holding member 73a is, for example, a ring-shaped member. A hole in a center of the sensor magnet holding member 73a fits a small diameter of the rear (+Z-side) end of the shaft 31. Thus, the position of the shaft 31 is determined by the sensor magnet holding member 73a. The sensor magnet holding member 73a is preferably fixed to the shaft 31 by press fitting, adhesion, etc. The sensor magnet holding member 73a can rotate together with the shaft 31.

[0087] The sensor magnet 73b is, for example, a ring shape. An N pole and an S pole of the sensor magnet 73b are alternately arranged in the circumferential direction. The sensor magnet 73b is fitted to an outer peripheral surface of the sensor magnet holding member 73a. Specifically, at least a portion of the sensor magnet 73b comes into contact with the outer peripheral surface of the sensor magnet holding member 73a. Thus, the sensor magnet 73b is arranged on the circumference (±θZ direction) of the shaft 31 at the rear (+Z side) of the second bearing 52 and can thus rotate with the shaft 31. The shaft 31 is indirectly held by the sensor magnet holding member 73a.

[0088] The rotation sensor 72 is mounted on the front surface 71b of the circuit board. The rotation sensor 72 faces the sensor magnet 73b in the axial direction (Z-axis direction). The rotation sensor 72 detects the position of the rotor in response to a change in the magnetic flux of the sensor magnet 73b. Although not shown, according to the exemplary embodiment, three rotation sensors 72 are arranged on the front surface 71b of the circuit board. Furthermore, a Hall element, for example, is used as the rotation sensor 72.

[0089] As in Fig. As shown in Figure 1, the front O-ring 81 is disposed within the housing body 21. The front O-ring 81 is held by the front O-ring holding portion 62e. The front O-ring 81 preferably contacts the inner surface of the housing body 21 and the outer surface of the main body portion 62 along a circular path.

[0090] The rear O-ring 82 is disposed within the cover 22. The rear O-ring 82 is fitted into the groove portion 62f of the main body portion 62. The entire circumference of the rear O-ring 82 preferably comes into contact with the front surface 22c of the cover.

[0091] This configuration of the front O-ring 81 and the back O-ring 82 is not limited to the above-mentioned configuration, and therefore, an O-ring with other configurations can also be used. According to this embodiment, the front O-ring 81 and the back O-ring 82 can preferably be manufactured into a ring shape by, for example, machining elongated silicon rubber with a round cross section.

[0092] The motor 10 is connected to the external power supply through the connector portion 63. The connected external power supply is electrically connected to the busbars 91a, 91b, 91c and the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f. The drive current from the external power supply is supplied to the coil 43 and the rotation sensor 72 through the busbars 91a, 91b, 91c and the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f. The rotation sensor 72 detects the magnetic flux of the rotor magnet. The drive current supplied to the coil 43 is controlled depending on the rotational position of the rotor 30, which is calculated, for example, based on the detected magnetic flux of the rotor magnet. When the drive current is supplied to the coil 43, a magnetic field is generated in the coil 43.In other words, when the drive current is supplied to the coil 43, a torque is generated between the rotor 30 and the stator 40. With this torque, the rotor 30 rotates with the shaft 31. This provides the motor 10 with a rotational drive force.

[0093] Next, a method for molding the busbar assembly 60 according to this embodiment will be described. The busbar assembly 60 is preferably molded by insert molding using the mold 83. Fig. 4 is a cross-sectional view illustrating the mold 83 by which the busbar assembly 60 is formed according to this embodiment. As shown in Fig. 4, the mold 83 has a back mold 84, a connector portion mold 85, and a front mold 86.

[0094] The back mold 84 is a mold that shapes a portion of the back (+Z side) of the busbar assembly 60. A surface of the front (-Z side) of the back mold 84 is provided with an unevenness that reverses the shape of the back of the busbar assembly 60.

[0095] The back mold 86 is a mold that shapes a portion of the front side (-Z side) of the busbar assembly 60. A surface of the back side (+Z side) of the front mold 86 is provided with an unevenness that reverses the shape of the front side of the busbar assembly 60.

[0096] The connector portion mold 85 is arranged between the rear side mold 84 and the axial direction (Z-axis direction) of the front side mold 86. The mold 83 includes a mold body portion 85a and a mold pin 85b. In other words, the connector portion mold 85 includes the mold body portion 85a and the mold pin 85b.

[0097] The molding portion 85a is a portion for molding the concave connector portion 63a. The molding portion 85a preferably has the same shape as the shape of an interior of the concave connector portion 63a. The shape of the molding portion 85a is preferably a cylindrical shape. A molding inner surface 85c of a radially inner side of the molding portion 85a forms the bottom surface 63b. A molding side surface 85h of the molding portion 85a forms a side surface 63f.

[0098] The mold inner side surface 85c is provided with a concave mold pin insertion portion (concave portion) 85d and concave wiring insertion portions 85e and 85f. In other words, the mold body portion 85a has the concave mold pin insertion portion 85d on the mold inner side surface 85c orthogonal to a direction in which the mold pin 85b extends (X-axis direction), that is, the radial direction in this embodiment.

[0099] An end portion on a radially outer side of the molded pin 85b is inserted into the concave molded pin insertion portion 85d. The external connection terminal 93b of the bus bar 91b is inserted into the concave wiring insertion portion 85e. The external connection terminal 94d of the circuit board connection member 92d is inserted into the concave wiring insertion portion 85f. Although not shown in the drawings, like the bus bar 91b, the external connection terminals 93a and 93c of the bus bars 91a and 91c are inserted into the molded body portion 85a. Like the circuit board connection member 92d, the external connection terminals 94a to 94c, 94e, and 94f of the circuit board connection members 92a to 92c, 92e, and 92f are inserted into the molded body portion 85a.The concave mold pin insertion portion 85d has a concave diameter extending portion 88 having a diameter larger than that of the mold inner side surface 85c side (-X side) on the radially outer side, that is, at the end of the opposite side (+X side) of the mold inner side surface 85c in the normal direction.

[0100] The mold pin 85b is a portion for forming the air hole 63c. This means that the mold pin 85b has the same shape as the interior of the air hole 63c. According to this embodiment, the mold pin 85b is a cylindrical shape extending in the normal direction (X-axis direction), that is, the radial direction, of the mold inner surface 85c. The mold pin 85b has a mold diameter extension portion 87 having a diameter larger than that of the side of the mold inner surface 85c (-X side) on the radially outer side, that is, at the end portion on the opposite side (+X side) of the mold inner surface 85c in the normal direction.

[0101] The mold pin 85b is a separate component from the mold body portion 85a. The mold pin 85b is inserted into the mold pin insertion concave portion 85d. The mold pin 85b is inserted from the opposite side (+X side) of the mold inner surface 85c in the normal direction to, for example, the mold body portion 85a. The mold pin diameter extension portion 87 is fitted into the concave diameter extension portion 88. With this, the mold pin 85b is not pulled out to the mold inner surface 85c side (-X side). Consequently, it is possible to prevent the mold pin 85b from falling into a mold space ARF1, which will be described later.

[0102] Although not shown in the drawings, the mold body portion 85a has a wall portion supporting the mold pin 85b on the radially outer side (+X side) of the mold diameter extension portion 87 from the radially outer side. According to this embodiment, the wall portion can be removed. With this, the mold pin 85b can be removed from the mold body portion 85a. In the case of removing the mold pin 85b, for example, the wall portion supporting the mold pin 85b is removed, and the mold pin 85b is pulled out radially outward (+X side). With this, the mold pin 85b can be removed from the mold body portion 85a.

[0103] The end portion on the opposite side (-X side) of the mold body portion 85a is supported by the front side mold 86 from the front side (-Z side). A gap AR1 is provided between an end surface 85g of the opposite side of the mold body portion 85a and the front side mold 86. This means that the end surface 85g is arranged separately from the front side mold 86 in the direction (X-axis direction) in which the mold pin 85b extends.

[0104] By combining the rear mold 84, the connector portion mold 85, and the front mold 86 together, the molding space ARF1 is provided within the mold 83. Portions of the busbars 91a, 91b, 91c and the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f to be embedded in the busbar holder 61 are positioned within the molding space ARF1. This means that at least a portion of each of the busbars 91a, 91b, 91c and the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f is positioned within the mold 83.

[0105] In this step, molten resin is introduced into the molding space ARF1. This molds the busbar assembly 60, which holds the busbars 91a, 91b, 91c and the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f. This means that the connector portion 63 is molded by causing resin to flow into the mold 83. More specifically, the connector portion 63 is molded by inserting the busbars 91a, 91b, 91c and the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f into the mold 83. In this case, the convex portion 69 is formed by causing resin to flow into the gap AR1 installed between the mold pin 85b and the front side mold 86.

[0106] If the mold pin 85b is fixed close to the outer edge of the mold inner side surface 85c, for example, when the mold pin insertion concave portion 85d is provided in the mold body portion 85a, the distance between the mold side surface 85h and the mold pin insertion concave portion 85d becomes closer. For this reason, a portion is created where the thickness of the mold body portion 85a is thin, so that the strength of the mold body portion 85a can be reduced. Therefore, if the mold pin 85b is fixed around the outer edge of the mold inner side surface 85c, the mold pin 85b can be fixed to the mold body portion 85a, for example, by inserting the mold pin 85b into the mold side surface 85h and then welding the mold side surface 85h thereto.In this case, however, the unevenness may occur on the mold side surface 85h due to welding, so that the unevenness may be generated on the side 63f of the concave connector portion 63a in the mold connector portion 63. Consequently, the gap is formed between the external power supply and the connector portion 63, more specifically, between the external power supply and the side surface 63f of the concave connector portion 63a, which may reduce the sealability.

[0107] Meanwhile, according to this embodiment, when the lower surface 63b is viewed from the normal direction, at least a portion of the air hole 63c is installed inside the edge OE of the external connection terminal group 99. Therefore, when the lower surface 63b is viewed from the normal direction, the air hole 63c can be arranged at a position relatively spaced from the outer edge of the lower surface 63b. With this, when the mold pin 85b is positioned in the mold body portion 85a, that is, the mold pin insertion concave portion 85d can be arranged at a position relatively spaced from the outer edge of the mold inner side surface 85c.Consequently, the configuration of the connector portion mold 85 for molding the connector portion 63 can be the configuration in which the mold pin 85b is inserted into the mold body portion 85a while suppressing a reduction in thickness between the mold side surface 85h and the mold pin insertion concave portion 85d.

[0108] Consequently, since the aforementioned mold pin 85b does not need to be welded to the mold body portion 85a, the unevenness that occurs when the mold pin 85b is welded to the mold body portion 85a is not incorporated into the connector portion mold 85. Thus, the unevenness that occurs due to the welding of the metal pin 85b to the mold body portion 85a does not occur in the connector portion 63. This makes it possible to suppress a reduction in the sealability between the external power supply and the connector portion 63.

[0109] According to this embodiment, when viewing the lower surface 63b from the normal direction, the entire air hole 63c is installed within the edge OE of the external connection terminal group 99. Therefore, the position of the mold pin insertion concave portion 85d can be a position farther away from the edge of the mold inner surface 85c. This makes it possible to suppress a reduction in thickness between the outer side surface of the mold body portion 85a and the mold pin insertion concave portion 85d in the configuration where the mold pin 85b is inserted into the mold body portion 85a.

[0110] The connector portion 63 is provided with the convex portion 69 facing the inner side opening 63e. Therefore, when the connector portion 63, that is, the busbar assembly 60, is molded, the clearance AR1 can be provided between an end surface 85g of the mold pin 85b and the front side mold 86. Therefore, even if a dimensional error occurs in the mold 83, there is no case where the end surface 85c contacts the front side mold 86 when a worker assembles the connector portion mold 85 and the front side mold 86. Therefore, when the busbar assembly 60 is molded, assembly of the mold 83 by the worker, etc., is easy.

[0111] Furthermore, the shape of the air hole 63c is preferably a linearly extending shape, as in this embodiment. This is because manufacturing the mold pin 85b that forms the air hole 63c is easy.

[0112] Here, when the shape of the air hole 63c is the linearly extending shape, for example, when the inside opening portion 63e of the air hole 63c is arranged at the rear side in front of the circuit board 71, the entire connector portion 63 is more easily arranged at a rear side behind the stator 40. Consequently, the size of the motor 10 in the axial direction is likely to increase.

[0113] In connection with this, according to this embodiment, the inner side opening 63e is positioned at the front in front of the circuit board 71. Therefore, even if the air hole 63c has a linearly extending shape, the connector portion 63 can be arranged close to the stator 40 in the axial direction. This makes it possible to easily manufacture the mold pin 85b forming the air hole 63c and suppress an increase in the size of the motor 10 in the axial direction.

[0114] According to this embodiment, the connector 63 is molded by causing resin to flow into the mold 83. Therefore, it is possible to easily manufacture the connector portion 63 and reduce the manufacturing cost of the connector portion 63.

[0115] According to this embodiment, the connector portion 63 is molded by inserting the wiring member, that is, the bus bar 91b and the circuit board connecting member 92d, into the mold 83. Therefore, the bus bar 91b and the circuit board connecting member 92d can be buried in the bus bar holder 61, and the bus bar holder 61 can hold the bus bar 91b and the circuit board 92d.

[0116] Furthermore, the mold pin 85b is a separate component from the mold body portion 85a. The mold pin 85b is inserted into the concave mold pin insertion portion 85d. Therefore, compared to the case where the connector portion mold 85 is manufactured as a single component, the connector portion mold 85 is easy to manufacture. As described above, the mold pin 85b is not fixed to the mold body portion 85a by welding. Therefore, it is possible to suppress a reduction in the sealability of the connector portion 63.

[0117] The mold pin 85b can be removed from the mold body portion 85a. Therefore, if, for example, the mold pin 85b is damaged, the mold pin 85b can be replaced. This eliminates the need to replace the entire connector portion mold 85 if only the mold pin 85b is damaged, thus reducing costs.

[0118] In addition, the configuration according to this embodiment is not limited to the above configuration.

[0119] Although the configuration is described in which three bus bars 91a, 91b, 91c and six circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f are installed as the wiring component, the present disclosure is not limited to this. When the external connection terminal is installed in multiples, the number of wiring components, that is, the number of bus bars and the number of circuit board connecting components, is not particularly limited in this embodiment.

[0120] If the external connection terminal of the busbar is installed in multiple configurations, the circuit board connection component may not be installed. If the external connection terminal of the circuit board connection component is installed in multiple configurations, the busbar may not be installed. As a wiring component, if the component other than the busbar and the component other than the circuit board connection component are installed, and the component has multiple external connection terminals, the busbar and the circuit board connection component may not be installed.

[0121] Each of the busbars 91a, 91b, 91c and each of the circuit board connecting components 92a, 92b, 92c, 92d, 92e, 92f is not limited to the above structure and could also have a plurality of external connection terminals. In this case, only one busbar could be installed as the wiring component. Only one circuit board connecting component could also be installed as the wiring component.

[0122] Furthermore, according to this embodiment, the positioning relationship between the air hole 63c and the plurality of external connection terminals is not limited to the example of Fig. 3. According to this embodiment, the setup could also be a setup as shown in Fig. 5A to 5G.

[0123] The Fig. 5A to 5G are diagrams schematically illustrating another example of the arrangement relationship between the air hole 63c and the plurality of external connection terminals, that is, the air hole 63c and the external connection terminal group. Fig. 5A to 5G, edges of all external connection groups are represented by a double-dotted line. Fig. 5A to 5G are diagrams illustrating the lower surface 63b of the concave connector portion 63a as viewed in the normal direction (X-axis direction).

[0124] An external connection terminal group 99A, which is Fig. 5A, is formed of six external connection terminals 90. An external connection terminal group 99B, which is shown in Fig. 5B, is formed of four external connection terminals 90. An external connection terminal group 99C, which is shown in Fig. 5C, is formed of six external connection terminals 90. An external connection terminal group 99D, which is shown in Fig. 5D, is formed of seven external connection terminals 90. An external connection terminal group 99E, which is shown in Fig. 5E, is formed of nine external connection terminals 90. An external connection terminal group 99F, which is shown in Fig. 5F, is formed of twelve external connection terminals 90. An external connection terminal group 99G, which is shown in Fig. 5G is formed from eight external connection terminals 90.

[0125] In every example of Fig. 5A to 5G, the entire air hole 63c is positioned within the edge of the external connection terminal group. As shown in Fig. 5C and Fig. 5E, the outer side opening 63d of the air hole 63c may not be provided in the center of the lower surface 63b. In the example of Fig. 5C, the outer side opening 63d is arranged at a position deviating from the center of the lower surface 63b toward a -Y side. In the example of Fig. 5E, the outer side opening 63d is arranged at a position deviated from the center of the lower surface 63b toward a front side (-Z side).

[0126] In addition, when viewing the lower surface 63b from the normal direction, at least a portion of the air hole 63c may be positioned within the edge OE of the external connection terminal group 99. This means that a portion of the air hole 63c may be positioned within the edge OE.

[0127] If a portion of the air hole 63c is positioned within the edge OE, only a portion of the entire cross-section of the air hole 63c could be positioned within the edge OE. If a portion of the air hole 63c is positioned within the edge OE, the entire cross-section of the air hole 63c could be a cross-section positioned outside the edge, and a portion of the cross-section of the air hole 63c could also be a cross-section positioned within the edge OE.

[0128] At least a portion of the outer side opening 63d may be positioned within the edge OE. In this case, a portion other than the outer side opening 63d may be positioned outside the edge OE.

[0129] The air hole 63c could, for example, be a curvilinearly extending shape, and a shape in which at least a portion is bent.

[0130] The connector portion 63 may extend in the axial direction and other directions from the motor body portion 11 toward the rear or the front.

[0131] The convex portion 69 is not necessarily incorporated.

[0132] The circuit board 71 is not necessarily installed.

[0133] A second exemplary embodiment describes using an air hole with a different shape than that of the first exemplary embodiment. In the following description, the same components as in the first exemplary embodiment are denoted by the same reference numerals, and therefore, the description thereof is omitted.

[0134] Fig. 6 is a cross-sectional view illustrating a portion of an engine 110 according to the second exemplary embodiment. As shown in Fig. As shown in Figure 6, the motor 110 includes a sealing member 160. The busbar assembly 160 includes a busbar support 161 and a plurality of wiring components electrically connected to the motor body portion 111. The motor body portion 111 is a different portion than a connector portion 163 of the busbar assembly 160, which will be described below.

[0135] The plurality of wiring components includes a circuit board connection board 92d and a bus bar 191b. Although not shown, similar to the first exemplary embodiment, six circuit board connection components are installed. Three bus bars are installed.

[0136] The busbar 191b includes a busbar body portion 197 and an external connection terminal 193b. A structure of the busbar body portion 197 has the same structure as the busbar body portion 97 according to the first embodiment, and therefore, the description thereof is omitted. The external connection terminal 193b is connected to a front side (-Z side) of the busbar body portion 197. The external connection terminal 193b extends linearly from the busbar body portion 197 toward a radially outer side. The external connection terminal 193b protrudes from the bottom surface 63b. Other configurations of the busbar 191b have the same configuration as the busbar 91b, and therefore, the description thereof is omitted.

[0137] The bus bar holder 161 includes a body portion 162, a connector portion 163, and a convex portion 169. A structure of the body portion 162 has the same structure as the body portion 162 according to the first embodiment, and therefore, the description thereof is omitted.

[0138] The connector portion 163 differs from the connector portion 63 according to the first embodiment in a shape of the air hole 163c. The air hole 163c has a base portion 163f and a narrow width portion 163g.

[0139] A base portion 163f has an outer side opening 163d opened on an outer side of the motor body portion 111. The outer side opening 163d is the same as the outer side opening 63d according to the first embodiment, and therefore, its description is omitted. A cross-sectional shape of the base portion 163f is, for example, a circular shape. Further, a cross-sectional shape of the base portion 163f is the same as the air hole 63c according to the first embodiment and is therefore not particularly limited. According to this embodiment, the base portion 163f extends in the normal direction (X-axis direction) of the bottom surface 63b, that is, the radial direction.

[0140] The narrow-width portion 163g is connected to one side of an accommodation space ARC2 (-X side) of the base portion 163f, that is, one end of an inner side in the radial direction. The narrow-width portion 163g extends in the normal direction (X-axis direction) of the lower surface 63b, that is, the radial direction. A cross-sectional area of ​​the narrow-width portion 163g is smaller than an open area of ​​the air hole 163c in the lower surface 63b. In other words, an area of ​​a cross section orthogonal to the direction in which the narrow-width portion 163g extends is smaller than an area of ​​the outer side opening 163d. According to the exemplary embodiment, a cross-sectional shape of the narrow-width portion 163g is a semicircular shape. Further, the cross-sectional shape of the narrow-width portion 163g is not particularly limited.The narrow width section 163g has an inside opening 163e opened in the accommodation space ARC2.

[0141] In the axial direction (Z-axis direction), a position of a rear side end (+Z side) of the narrow width portion 163g is the same as a position of a rear side end of the base portion 163f. Here, a front side (-Z side) of a connected portion between the base portion 163f and the narrow width portion 163b is provided with a stepped portion 163h. The stepped portion 163h is a step that protrudes from the front side toward the rear side while arriving from the outer side opening 163d to the inner side opening 163e.

[0142] The convex portion 169 faces the inner side opening 163e. The convex portion 169 is the same as the convex portion 69 according to the first embodiment, so its description is omitted. Other configurations of the motor 110 are the same as those of the motor 10 according to the first embodiment.

[0143] Next, a method for forming the busbar assembly 160 according to this embodiment will be described. The busbar assembly 160 is formed by molding using a mold 183. Fig. 7 is a cross-sectional view illustrating the mold 183 by which the bus bar assembly 160 is formed according to this embodiment.

[0144] As in Fig. As shown in Figure 7, the mold 183 includes the back mold 84, a connector portion mold 185, and a front mold 186. A structure of the front mold 186 is the same as that of the front mold 86 according to the first embodiment. By combining the back mold 84, the connector portion mold 185, and the front mold 186, the molding space ARF2 is provided.

[0145] The connector portion mold 185 includes the mold body portion 85a and a mold pin 185b. The mold pin 185b is a portion that forms an air hole 163c. This means that the mold pin 185 has the same shape as an interior of the air hole 163c. The mold pin 185b includes a pin base portion 185i and a narrow-width pin portion 185j.

[0146] The pin base portion 185i is inserted into the concave mold pin insertion portion 85d of the mold body portion 85a. A portion exposed to the molding space ARF2 in the pin base portion 185i is a portion that forms the base portion 163f. The pin base portion 185i is preferably a cylindrical shape extending in the normal direction (X-axis direction) of the mold inner surface 85c.

[0147] The narrow-width pin portion 185j is bonded to the end of the opposite side (-X side) to the mold body portion 85a of the pin base portion 185i. The narrow-width pin portion 185j is a portion that forms the narrow-width portion 163g. A cross-sectional area of ​​the narrow-width pin portion 185j is smaller than that of the pin base portion 185i. The narrow-width pin portion 185j is a semi-cylindrical shape extending in the normal direction (X-axis direction) of the mold inner surface 85c. A gap AR2 is installed between the end surface 185g and the front-side mold 186.

[0148] In the axial direction (Z-axis direction), a position of a rear side end (+Z side) of the narrow-width pin portion 185j is the same as a position of a rear side end of the pin base portion 185i. Here, the front side (-Z side) of the bonded portion between the pin base portion 185i and the narrow-width pin portion 185j is provided with a stepped portion 185k. The stepped portion 185k is a step that is concave toward the rear side as it arrives from the pin base portion 185i to the narrow-width pin portion 185j. Other configurations of the mold pin 185b are the same as those of the mold pin 185b according to the first embodiment.

[0149] Similar to the first embodiment, in the state where the bus bar 191b and the circuit board connecting member 92d are inserted into the molding space ARF2, the molten resin flows into the molding space ARF2 to solidify therein, so that the bus bar assembly 160 is molded. The resin flows into the gap AR2 installed between the connector portion mold 185 and the front side mold 186 to solidify, so that the block portion 169 is molded.

[0150] Here, there is a case where a section of the busbar is positioned on a side provided with the air hole, rather than on a section exposed to the exterior of the motor body part. More specifically, as shown in Fig. 6, a case where the busbar body portion 197 is arranged at the rear behind the external connection terminal 193d. In this case, when the busbar assembly is formed by insert molding, a portion of the busbar is arranged at a position close to the mold pin. In this case, in the molded connector part, if a portion of the busbar contacts the mold pin, there is a problem that a portion of the busbar opposite the air hole might be exposed. Furthermore, even if a portion of the busbar does not contact the mold pin, if the gap between a portion of the busbar and the mold pin is reduced, resin hardly flows into the gap between a portion of the busbar and the mold pin, so a portion of the busbar opposite the air hole is likely to be exposed.

[0151] In connection with this, according to this embodiment, the air hole 163c has the narrow width portion 163g. Therefore, as shown in Fig. 7, the connector portion 163 may be formed using the mold pin 185b with the narrow width pin portion 185j. This could Fig. 7, the gap between the busbar body portion 197 and the molded pin 185b, that is, the busbar body portion 197 and the narrow-width pin portion 185j, can be large, so that exposure of the busbar 191b to the air hole 163c can be suppressed. Furthermore, the circuit board connecting member 92d can achieve the same effect.

[0152] While preferred embodiments of the present disclosure have been described above, it is understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. Therefore, the scope of the present disclosure is to be determined only by the following claims.

Claims

[1] Engine (10) having the following features: an engine body section (11) having the following features: a rotor (30) having a shaft (31) whose center is located on a central axis extending in one direction; a stator (40) surrounding the rotor and rotating the rotor about the central axis; a first bearing (51) arranged on a first side in one direction of the stator and supporting the shaft; a second bearing (52) arranged on a second side opposite the first side of the stator and supporting the shaft, the second bearing (52) being held by a return bearing holding portion (65) of a bus bar holder (61), the bus bar holder (61) including a main body portion (62), a connector portion (63), a connection terminal holding portion (64), the return bearing holding portion (65), and a circuit board support portion (67), at least one circuit board support portion (67) supporting the circuit board (71); and a housing (20) having an accommodation space for accommodating the rotor, the stator, the first bearing and the second bearing; the connector portion (63) arranged to the motor body portion; and a wiring component electrically connected to the motor body portion, wherein the connector portion has an exposed surface exposed to an exterior of the motor body portion, the wiring component has a plurality of external connection terminals connected to an external power supply and protruding from the exposed surface of the connector portion, the connector portion is provided with a through hole extending from the exposed surface toward the accommodation space and allowing the exterior of the motor body portion and the accommodation space to communicate with each other, and when viewing the exposed surface from a normal direction, at least a portion of the through-hole is positioned within an outer edge of an external connection terminal group formed from the plurality of external connection terminals; wherein the engine body portion (11) further comprises: a main body portion (62) connected to the connector portion (63); a groove portion (62f) provided along the contour of the main body portion (62) on the second side; a first sealing portion (81) disposed between the main body portion (62) and the housing (20); and a second sealing portion (82) disposed in the groove portion (62f); and the through hole is arranged between the first sealing section (81) and the second sealing section (82) in the axial direction. [2] A motor according to claim 1, wherein, when the exposed surface is viewed from the normal direction, the entire through-hole is positioned within the outer periphery of the external connection terminal group. [3] Engine according to claim 1 or 2, wherein the through-hole has a narrow-width portion located on the motor body portion side of the connector portion, and a cross-sectional area of the narrow width portion is smaller than an open area of the through hole in the exposed surface. [4] Engine according to one of claims 1 to 3, wherein the through hole has an inside opening which is open in the accommodation space, and the motor body portion has a convex portion facing the inside opening. [5] Engine according to one of claims 1 to 4, wherein the motor body portion has a circuit board (71) arranged on the second side behind the second bearing, the through hole has an inside opening which is open towards the accommodation space, and the inside opening is positioned on the first side in front of the circuit board. [6] A motor according to any one of claims 1 to 5, wherein the connector portion is formed by causing resin to flow into a mold. [7] A motor according to claim 6, wherein the connector portion (63) is molded by inserting the wiring member into the mold. [8] Engine according to claim 6 or 7, wherein the mold has a mold pin (85b) forming the mold body portion and the through hole, the mold pin is a separate component from the mold body section, the mold body portion has a concave portion on a surface orthogonal to a direction in which the mold pin extends, and the forming pin is inserted into the concave section. [9] An engine according to claim 8, wherein the mold pin is removed from the mold body portion.

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