Bus bar assembly equipped with magnetic body

Abstract

Disclosed is a bus bar assembly equipped with a magnetic body, which is capable of suppressing contact between a pair of bus bars.　A bus bar assembly 10 equipped with a magnetic body comprises: a pair of bus bars 12, 14; an annular magnetic body 16 which is inserted outside the pair of bus bars 12, 14; and an insulating holding member 18 which holds the pair of bus bars 12, 14 and the magnetic body 16 in a mutually non-contact manner. The insulating holding member 18 has: an annular magnetic body housing tube portion 36 in which the magnetic body 16 is housed; and a pair of bus bar housing portions 42, 44 which are disposed away from each other across an insulating partition wall 40 extending in an axial direction so as to pass through an inner hole 38 of the magnetic body housing tube portion 36, and in which the pair of bus bars 12, 14 are respectively housed.

Description

Busbar assembly with magnetic material

[0001] The present disclosure relates to a busbar assembly with magnetic material.

[0002] Motor-driven vehicles such as electric vehicles and hybrid vehicles are equipped with bus bars through which large currents flow. In order to eliminate noise from such bus bars, Patent Document 1 proposes the use of a magnetic bus bar assembly in which an annular magnetic body such as a ferrite core is inserted around the bus bar.

[0003] Japanese Patent Application Laid-Open No. 2019-186406

[0004] However, in the busbar assembly disclosed in Patent Document 1, a pair of busbars that form a current path are inserted in parallel with a gap between them within a single inner hole of an annular core housing that houses a ferrite core. Because the busbars are separated only by a space, there is a risk that the pair of busbars may come into contact with each other due to vibrations or unexpected impacts while mounted on a vehicle.

[0005] Therefore, a magnetic body-equipped bus bar assembly that can prevent a pair of bus bars from contacting each other is disclosed.

[0006] The magnetic body-equipped busbar assembly of the present disclosure includes a pair of busbars, an annular magnetic body that is extrapolated onto the pair of busbars, and an insulating retaining member that holds the pair of busbars and the magnetic body in a non-contact state, wherein the insulating retaining member has an annular magnetic body accommodating cylindrical portion in which the magnetic body is accommodated, and a pair of busbar accommodating portions that are arranged across an insulating partition wall that extends axially through an inner hole of the magnetic body accommodating cylindrical portion and in which the pair of busbars are respectively accommodated.

[0007] According to the bus bar assembly with magnetic body of the present disclosure, it is possible to prevent the pair of bus bars from contacting each other.

[0008] FIG. 1 is a perspective view showing a busbar assembly with magnetic bodies according to a first embodiment. FIG. 2 is a plan view of the busbar assembly with magnetic bodies shown in FIG. 1. FIG. 3 is a bottom view of the busbar assembly with magnetic bodies shown in FIG. 1. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. FIG. 5 is an enlarged longitudinal cross-sectional view showing the cross section V-V in FIG. 2. FIG. 6 is a perspective view showing a magnetic body fixing jig constituting an insulating holder of the busbar assembly with magnetic bodies shown in FIG. 1. FIG. 7 is a perspective view showing a state in which the magnetic body is fixed to the magnetic body fixing jig shown in FIG. 6. FIG. 8 is a perspective view showing a state in which a cylindrical cover portion is fitted onto the magnetic body shown in FIG. 7 and the magnetic body is housed in the insulating holder. FIG. 9 is a perspective view showing a state in which one of a pair of busbars is assembled to the insulating holder shown in FIG. 8.

[0009] <Description of Embodiments of the Present Disclosure> First, embodiments of the present disclosure will be described below. A bus bar assembly with magnetic body according to the present disclosure includes: (1) a pair of bus bars, an annular magnetic body fitted onto the pair of bus bars, and an insulating retaining member that holds the pair of bus bars and the magnetic body in a non-contact state, wherein the insulating retaining member has an annular magnetic body accommodating cylindrical portion that accommodates the magnetic body, and a pair of bus bar accommodating portions that are disposed across an insulating partition wall that penetrates an inner hole of the magnetic body accommodating cylindrical portion and extends in the axial direction, and that accommodate the pair of bus bars, respectively.

[0010] In the busbar assembly with magnetic body of this aspect, the pair of busbars and the magnetic body that constitute the current path are held in a non-contact state by the insulating holder. Moreover, the insulating holder is provided with a pair of busbar accommodating portions separated by an insulating partition wall that penetrates the inner hole of the magnetic body accommodating cylindrical portion and extends in the axial direction, and each busbar is accommodated in each busbar accommodating portion. Therefore, compared to a conventional structure in which the pair of busbars inserted through the inner hole are separated only by a space, the risk of the pair of busbars contacting each other can be reduced or avoided.

[0011] As the annular magnetic body, any of well-known annular magnetic bodies such as a ferrite core or a nanocrystalline soft magnetic core can be used.

[0012] (2) In the above (1), it is preferable that the pair of busbar accommodating portions are stacked in a first orthogonal direction perpendicular to the axial direction of the magnetic material accommodating cylindrical portion, separated by the insulating partition wall, and each busbar accommodating portion has a height dimension in the same direction as the first orthogonal direction that is larger than the plate thickness dimension of each busbar, and a width dimension in a second orthogonal direction that is larger than the plate width dimension of each busbar and larger than the height dimension.

[0013] Because the pair of busbar accommodating portions are arranged across an insulating partition wall, the insulation of the pair of busbars accommodated therein can be advantageously ensured even when the busbar accommodating portions are stacked in a first orthogonal direction (e.g., the vertical direction) perpendicular to the axial direction of the magnetic body accommodating cylindrical portion. Furthermore, the height of each busbar accommodating portion in the first orthogonal direction is greater than the thickness of the busbar, and the width of each busbar accommodating portion in a second orthogonal direction perpendicular to the first orthogonal direction is greater than the width of the busbar. That is, the pair of busbar accommodating portions stacked in the first orthogonal direction have height and width dimensions sufficient to accommodate a busbar in a flat state (with the thickness direction aligned with the first orthogonal direction, e.g., the vertical direction). This advantageously achieves a smaller magnetic body-equipped busbar assembly in the first orthogonal direction while maintaining insulation, compared to conventional structures in which stacking in the first orthogonal direction (e.g., the vertical direction) is difficult.

[0014] (3) In the above (1) or (2), the magnetic body accommodating cylindrical portion of the insulating holding member includes an inner hole forming cylindrical portion that forms the inner hole of the magnetic body accommodating cylindrical portion and extends in the axial direction with a rectangular frame cross section that is flat in a first orthogonal direction that is orthogonal to the axial direction; an inner hole forming cylindrical portion that protrudes outward from the outer peripheral surface of one axial end side of the inner hole forming cylindrical portion; an elastic locking portion that is formed on the outer peripheral surface of the other axial end side of the inner hole forming cylindrical portion and is capable of flexibly deforming inward in the first orthogonal direction; and a cover cylindrical portion that covers the outer peripheral surface of the rectangular frame-shaped magnetic body that is inserted into the inner hole forming cylindrical portion and the end face of the other axial end side. and the cover tubular portion inserted on the magnetic body can be assembled from the other axial end side of the inner hole forming tubular portion toward the one axial end side by flexible deformation of the elastic locking portion, and at the assembly end position where the end face on the one axial end side of the magnetic body abuts the flange plate portion, the elastic locking portion elastically returns to its original state, and the magnetic body and the cover tubular portion are positioned and held in the axial direction between the elastic locking portion and the flange plate portion, and the magnetic body is covered over its entire circumference by the inner hole forming tubular portion, the flange plate portion, and the cover tubular portion.

[0015] The magnetic body accommodating cylindrical portion of the insulating holding member is configured as follows: (i) an inner bore-forming cylindrical portion and a flange plate portion protruding from one axial end thereof, and (ii) a cover cylindrical portion covering the outer circumferential surface and the end face at the other axial end thereof, and the magnetic body and the cover cylindrical portion are configured to be assemblable to the inner bore-forming cylindrical portion from the other axial end, thereby providing a magnetic body accommodating cylindrical portion with excellent manufacturability and assembly workability. In particular, by providing an elastic locking portion at the other end of the inner bore-forming cylindrical portion, the cover cylindrical portion can be assembled in the axial direction by bending the elastic locking portion, and the magnetic body and the cover cylindrical portion can be reliably positioned and held by elastic return of the elastic locking portion.

[0016] (4) In the above (3), it is preferable that the inner peripheral surface of the one axial end of the cylindrical cover portion covers the protruding end surface of the flange plate portion from the outer periphery. This is because the inner peripheral surface of the one axial end of the cylindrical cover portion covers the protruding end surface of the flange plate portion from the outer periphery, thereby ensuring stable insulation between the magnetic body and the bus bar.

[0017] (5) In any one of (1) to (4) above, it is preferable that the busbar accommodating portion provided on one side of the insulating partition wall has a support accommodating portion including the insulating partition wall protruding toward the other axial end of the magnetic body accommodating cylindrical portion and a pair of side wall portions protruding from both side edge portions of the insulating partition wall, and an elastic engaged portion that protrudes toward the one axial end of the magnetic body accommodating cylindrical portion and flexes and deforms to allow the busbar to be inserted from the one axial end side of the busbar accommodating portion to the other axial end side, and that elastically returns to its original state to engage with an engaging portion provided on the busbar to prevent displacement of the busbar in the axial direction.

[0018] The busbar accommodating portion is provided on one side of the insulating partition wall and accommodates a busbar that penetrates the magnetic body accommodating cylindrical portion from one axial end to the other axial end. The busbar accommodating portion includes a support accommodating portion that includes the insulating partition wall protruding toward the other axial end and a pair of side wall portions protruding from both edge portions of the support accommodating portion. This allows the busbar to axially penetrate the magnetic body accommodating cylindrical portion while being supported by the support accommodating portion relative to the busbar accommodating portion provided on one side. Furthermore, the one axial end, which is opposite the insertion direction of the busbar, is provided with an elastic engaged portion that flexes to allow insertion of the busbar and then elastically returns to its original position to engage with the engaging portion of the busbar and prevent axial displacement of the busbar. This allows the busbar accommodated in the busbar accommodating portion provided on one side of the insulating partition wall to be stably and securely held.

[0019] (6) In any one of (1) to (5) above, it is preferable that the busbar accommodating portion provided on the other side of the insulating partition wall has a support accommodating portion including the insulating partition wall protruding toward the one axial end of the magnetic body accommodating cylindrical portion and a pair of side wall portions protruding from both side edge portions of the insulating partition wall, and an elastic engaged portion that protrudes toward the other axial end of the magnetic body accommodating cylindrical portion and flexes and deforms to allow the busbar to be inserted from the other axial end side of the busbar accommodating portion to the one axial end side, and that elastically returns to its original state to engage with an engaging portion provided on the busbar to prevent displacement of the busbar in the axial direction.

[0020] In the busbar accommodating portion that is provided on the other side of the insulating partition wall and that accommodates a busbar that penetrates the magnetic body accommodating cylindrical portion from the other axial end side toward the one end side, similar to the above-mentioned (5), by providing a support accommodating portion and an elastic engaged portion, it is possible to achieve the same effect as the above-mentioned (5). Therefore, by adopting the above-mentioned (5) in combination with the present mode (6), it is possible to more reliably accommodate and hold a pair of busbars that extend in opposite directions to each other in the axial direction of the magnetic body accommodating cylindrical portion in each busbar accommodating portion with good assembly workability.

[0021] <Details of the Embodiments of the Present Disclosure> Specific examples of the busbar assembly with magnetic body of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0022] 1 to 9 , a busbar assembly 10 with magnetic material according to a first embodiment of the present disclosure will be described. The busbar assembly 10 with magnetic material is intended for use in, for example, an electrical junction box in an electric vehicle or a hybrid vehicle, and includes a pair of busbars 12, 14 (a positive busbar 12 and a negative busbar 14) and a ferrite core 16 as an annular magnetic material that is inserted around each of the busbars 12, 14. Both ends of each busbar 12, 14 are electrically connected to on-board components such as a motor or a PCU (power control unit), and the ferrite core 16 suppresses noise during power transmission between the on-board components via the busbars 12, 14. Although the magnetic-body-equipped busbar assembly 10 can be arranged in any orientation in the vehicle, in the following description, the upper side will be referred to as the upper side in Fig. 4, the lower side as the lower side in Fig. 4, the left side as the upper side in Fig. 2, the right side as the lower side in Fig. 2, the front side as the left side in Fig. 2, and the rear side as the right side in Fig. 2. In addition, for multiple identical components, reference numerals may be assigned to only some of the components, and the reference numerals may be omitted for the other components.

[0023] <Magnetic-body-equipped busbar assembly 10> As described above, the magnetic-body-equipped busbar assembly 10 includes a pair of busbars, i.e., positive and negative busbars 12, 14, and a ferrite core 16 as an annular magnetic body that is extrapolated onto each of the busbars 12, 14. The magnetic-body-equipped busbar assembly 10 also includes an insulating holder 18 that holds the pair of busbars (positive and negative busbars 12, 14) and the magnetic body (ferrite core 16) in a non-contact state. Note that in the first embodiment, both the positive busbar 12 and the negative busbar 14 are formed by stacking two busbars that have substantially the same shape, but the following description will be given assuming that each is a single positive busbar 12 and a single negative busbar 14. The two bus bars constituting the positive and negative bus bars 12, 14 may be fixed to each other by welding or the like, or may simply be overlapped without being fixed to each other.

[0024] <Pair of Busbars (Positive and Negative Busbars 12, 14)> The positive and negative busbars 12, 14 are formed by stamping a conductive metal plate into a predetermined shape, and each extends in the front-to-rear direction. Each busbar 12, 14 has a plurality of bolt insertion holes 20 formed at both longitudinal ends thereof, penetrating the busbar 12, 14 in the thickness direction (vertical direction). The positive busbar 12 has a bent portion 22 that bends upward at its rear. The positive busbar 12 has a positive engagement portion 24, which is a notched engagement portion that opens to the right and penetrates vertically, at the right end of the rear portion of the positive busbar 12, forward of the bent portion 22. The negative busbar 14 has negative engagement portions 26, 26, which are notched engagement portions that open outward in the lateral direction and penetrate vertically, on both left and right sides of its front portion.

[0025] 4 and 5, the ferrite core 16 is annular as a whole, and the internal space 27 of the ferrite core 16 has a horizontally elongated, generally rectangular cross section in which the maximum left-right dimension is greater than the maximum up-down dimension. The maximum up-down and left-right dimensions of the internal space 27 are slightly greater than the maximum up-down and left-right dimensions of the internal bore-forming tubular portion 50, which will be described later, respectively, so that the internal space 27 can be inserted therethrough.

[0026] The ferrite core 16 has a predetermined longitudinal dimension. That is, the ferrite core 16 is generally cylindrical overall and includes a peripheral wall 28 that extends continuously in the circumferential direction. As a result, the ferrite core 16 has a rear end face 30 that extends in a generally annular shape as an end face at one axial end in the longitudinal direction, which is the axial direction of an inner hole 38 of a magnetic body housing cylindrical portion 36 (described later), and a front end face 32 that extends in a generally annular shape as an end face at the other axial end. The ferrite core 16 also has an outer peripheral surface 34 that extends in a generally rectangular frame shape or a generally elongated cylindrical shape between the rear end face 30 and the front end face 32 in the longitudinal direction. While known materials may be used for the ferrite core 16, in the first embodiment, the ferrite core 16 is formed of an Mn-Zn ferrite.

[0027] <Insulating Holder 18> The insulating holder 18 has an annular magnetic body accommodating cylindrical portion 36 that accommodates an annular magnetic body (ferrite core 16), and an insulating partition wall 40 that extends in the axial direction (front-rear direction) through an inner hole 38 of the magnetic body accommodating cylindrical portion 36. The insulating holder 18 also has a pair of busbar accommodating portions 42, 44 (the positive busbar accommodating portion 42 and the negative busbar accommodating portion 44) that are separated by the insulating partition wall 40 and accommodate the pair of bus bars (the positive and negative busbars 12, 14) described above, respectively. These positive and negative busbar accommodating portions 42, 44 are stacked across the insulating partition wall 40 in a first orthogonal direction (the up-down direction) that is orthogonal to the axial direction of the magnetic body accommodating cylindrical portion 36. In the first embodiment, a positive bus bar accommodating portion 42 is provided on one side, i.e., the upper side, of the insulating partition wall 40, and a negative bus bar accommodating portion 44 is provided on the other side, i.e., the lower side, of the insulating partition wall 40.

[0028] In the first embodiment, the insulating holding member 18 includes a magnetic body fixing jig 46 shown in FIG. 6 and a cover tubular portion 48 that covers the outer peripheral surface 34 and the other axial end surface (front end surface 32) of the magnetic body (ferrite core 16). The magnetic body fixing jig 46 and the cover tubular portion 48 are formed, for example, from an insulating hard synthetic resin. The magnetic body fixing jig 46 includes the insulating partition wall 40 and the positive and negative busbar accommodating portions 42, 44. As described below, the cover tubular portion 48 is assembled to the magnetic body fixing jig 46 to form the magnetic body accommodating tubular portion 36. That is, the annular magnetic body accommodating tubular portion 36 is formed by the radial region between the magnetic body fixing jig 46 provided on the inner peripheral side and the cover tubular portion 48 provided on the outer peripheral side, and the inner hole 38 of the magnetic body accommodating tubular portion 36 is formed in the magnetic body fixing jig 46, penetrating the magnetic body fixing jig 46 in the axial direction (front-rear direction).

[0029] <Magnetic Body Fixing Jig 46> The magnetic body fixing jig 46 that constitutes the magnetic body accommodating cylindrical portion 36 defines the inner hole 38 of the magnetic body accommodating cylindrical portion 36 and includes an inner hole forming cylindrical portion 50 that has a flattened rectangular frame cross section in the first orthogonal direction (up-down direction) and extends in the axial direction (front-rear direction). The inner hole forming cylindrical portion 50 is formed in the middle portion of the magnetic body fixing jig 46 in the front-rear direction and is composed of an upper wall portion 52 on the upper side, a lower wall portion 54 on the lower side, and left wall portions 56 and right wall portions 58 on both the left and right sides that form a rectangular cylinder. Each of these wall portions 52, 54, 56, 58 has a substantially constant thickness dimension over substantially the entire length in the front-rear direction, and the inner and outer peripheral surfaces are each shaped like a horizontally elongated rectangular cylinder in which the left-right dimension is greater than the up-down dimension. An insulating partition wall 40 extends axially through the inner hole 38 of the magnetic body accommodating cylindrical portion 36, which is formed by these wall portions 52, 54, 56, and 58, and the inner hole 38 is divided in the vertical direction by the insulating partition wall 40. That is, the positive electrode bus bar accommodating portion 42 includes the portion of the inner hole 38 above the insulating partition wall 40, and the negative electrode bus bar accommodating portion 44 includes the portion of the inner hole 38 below the insulating partition wall 40.

[0030] <Insulating Partition Wall 40> The insulating partition wall 40 has a generally flat plate shape with a rectangular cross section, and its left-right dimension is larger than its up-down dimension. The left and right ends of the insulating partition wall 40 are connected to the left wall portion 56 and the right wall portion 58 of the inner hole forming cylindrical portion 50, respectively. As a result, the positive busbar accommodating portion 42 includes the upper wall portion 52, the upper portions of the left wall portion 56 and the right wall portion 58, and the area surrounded by the insulating partition wall 40. The negative busbar accommodating portion 44 includes the lower wall portion 54, the lower portions of the left wall portion 56 and the right wall portion 58, and the area surrounded by the insulating partition wall 40. The insulating partition wall 40 has a length (front-rear dimension) longer than the magnetic body accommodating cylindrical portion 36, and the insulating partition wall 40 protrudes on both front-rear directions beyond the magnetic body accommodating cylindrical portion 36.

[0031] <Pair of Busbar Accommodating Portions (Positive and Negative Busbar Accommodating Portions 42, 44)> Each busbar accommodating portion 42, 44 has a predetermined vertical dimension within the inner hole 38 and, as shown in FIG. 5 , has a substantially rectangular cross-sectional shape. In the first embodiment, the busbar accommodating portions 42, 44 are formed to have cross-sectional shapes of substantially equal size. Each busbar accommodating portion 42, 44 has a height dimension in the same direction as the first orthogonal direction (vertical direction) that is greater than the thickness dimension of each busbar 12, 14 (the thickness dimension of the portion inserted into each busbar accommodating portion 42, 44, the vertical dimension). Furthermore, in a second orthogonal direction (horizontal direction) that is perpendicular to the first orthogonal direction, each busbar accommodating portion 42, 44 has a width dimension that is greater than the width dimension of each busbar 12, 14 (the width dimension of the portion inserted into each busbar accommodating portion 42, 44, the horizontal dimension).

[0032] Each busbar accommodating portion 42, 44 is configured to include portions on both front-rear sides of the inner hole-forming cylindrical portion 50 in addition to a portion formed within the inner hole 38. Specifically, the busbar accommodating portion (positive-side busbar accommodating portion 42) provided on one side of the insulating partition wall 40 includes the insulating partition wall 40 protruding from the other axial end (front end) of the magnetic body accommodating cylindrical portion 36 (inner hole-forming cylindrical portion 50) and a positive-side support accommodating portion 62 as a support accommodating portion including a pair of side wall portions 60, 60 protruding upward from both left and right edge portions of the insulating partition wall 40. Each of these side wall portions 60 extends forward continuously from upper portions of the left wall portion 56 and the right wall portion 58 that constitute the inner hole-forming cylindrical portion 50. That is, the positive-side support accommodating portion 62 has a rectangular cross section of the same size as the positive-side busbar accommodating portion 42 within the inner hole 38, but its upper portion is not covered by the upper wall portion 52 and is open upward.

[0033] The positive busbar accommodating portion 42 also has an elastic engaged portion 64 that protrudes toward one axial end (rear end) of the magnetic body accommodating cylindrical portion 36 (inner hole forming cylindrical portion 50). In the first embodiment, a pair of elastic engaged portions 64, 64 is provided on both the left and right sides of the rear end portion of the inner hole forming cylindrical portion 50. In particular, in the first embodiment, the left elastic engaged portion 64 protrudes rearward from the rear end portion of the left wall portion 56, and the right elastic engaged portion 64 protrudes rearward from the right end portion of the upper wall portion 52, at a portion of the upper wall portion 52 rearward of a flange plate portion 76 (described later).

[0034] Each of these elastic engaged portions 64 is elastically deformable in the thickness direction, with the left elastic engaged portion 64 elastically deformable in the left-right direction and the right elastic engaged portion 64 elastically deformable in the up-down direction. An engaging claw 66 that protrudes inward in the left-right direction (to the right) is provided at the protruding end (rear end) of the left elastic engaged portion 64, and an engaging claw 66 that protrudes inward in the up-down direction (downward) is provided at the protruding end (rear end) of the right elastic engaged portion 64. The front end surfaces of the left and right engaging claws 66, 66 are flat surfaces that extend in a direction perpendicular to the front-to-rear direction, and the rear end surfaces of each engaging claw 66, 66 are inclined surfaces that gradually protrude to the right or downward toward the front.

[0035] When the positive busbar 12 is inserted into the positive busbar accommodating portion 42 (described later), each of these elastic engaged portions 64 is flexibly deformed (elastically deformed in the first embodiment), thereby allowing the positive busbar 12 to be inserted from one axial end (rear end) to the other axial end (front end) of the positive busbar accommodating portion 42. When each of these elastically deformed elastic engaged portions 64 elastically returns to its original state, an engaging claw 66 of each elastic engaged portion 64 engages with an engaging portion (positive engaging portion 24) provided on the positive busbar 12, thereby preventing axial displacement of the positive busbar 12. In the first embodiment, the engaging claw 66 of the left elastic engaged portion 64 is adapted to engage with the left end of a bent portion 22 that bends upward in the rear portion of the positive busbar 12, and the positive engaging portion 24 is configured at the left end of the bent portion 22.

[0036] Similarly, the busbar accommodating portion (negative-side busbar accommodating portion 44) provided on the other side of the insulating partition wall 40 includes the insulating partition wall 40 protruding from one axial end (rear end) of the magnetic body accommodating cylindrical portion 36 (inner hole forming cylindrical portion 50) and a negative-side support accommodating portion 68 as a support accommodating portion including a pair of side wall portions 60, 60 protruding downward from both left and right edge portions of the insulating partition wall 40. Each of these side wall portions 60 extends rearward continuously from the lower portions of the left wall portion 56 and the right wall portion 58 that constitute the inner hole forming cylindrical portion 50. That is, the negative-side support accommodating portion 68 has a rectangular cross section of the same size as the negative-side busbar accommodating portion 44 in the inner hole 38, but its lower portion is not covered by the bottom wall portion 54 and is open downward.

[0037] The negative busbar accommodating portion 44 has an elastically engaged portion 70 that protrudes from the other axial end (front end) of the magnetic body accommodating cylindrical portion 36 (inner hole forming cylindrical portion 50). In the first embodiment, a pair of elastically engaged portions 70 is provided on both the left and right sides of the front end of the inner hole forming cylindrical portion 50. In particular, in the first embodiment, each elastically engaged portion 70 is provided to protrude forward from the front end of the left wall portion 56 and the right wall portion 58. Each elastically engaged portion 70 is elastically deformable in the thickness direction (left and right direction). The protruding end (front end) of each elastically engaged portion 70 is provided with an engaging claw 72 that protrudes inward in the left and right direction. The rear end surfaces of the left and right engaging claws 72 are flat surfaces that extend in a direction perpendicular to the front-to-rear direction, and the front end surfaces of each engaging claw 72 are inclined surfaces that gradually increase inward in the left and right direction toward the rear.

[0038] When the negative busbar 14 is inserted into the negative busbar accommodating portion 44 (described later), each of these elastic engaged portions 70 is flexibly deformed (elastically deformed in the first embodiment), thereby allowing the negative busbar 14 to be inserted from the other axial end (front end) to the one axial end (rear end) of the negative busbar accommodating portion 44. When each of these elastically deformed elastic engaged portions 70 elastically returns to its original state, the engaging claws 72 of each elastic engaged portion 70 engage with an engaging portion (negative engaging portion 26) provided on the negative busbar 14, thereby preventing axial displacement of the negative busbar 14.

[0039] Furthermore, a flange plate portion 76 that protrudes outward and extends in a generally annular shape is formed on one axial end (rear end) of the outer peripheral surface 74 of the inner bore-forming cylindrical portion 50 (i.e., the outer surfaces of each of the wall portions 52, 54, 56, and 58). In the first embodiment, the flange plate portion 76 has a predetermined protruding dimension toward the outer peripheral side and is formed continuously around substantially the entire circumferential direction. The protruding dimension of the flange plate portion 76 toward the outer peripheral side is not limited, but is set to be generally equal to the radial width dimension of the ferrite core 16, for example. As a result, when the ferrite core 16 is inserted into the inner bore-forming cylindrical portion 50 and the rear end surface 30 of the ferrite core 16 abuts against the flange plate portion 76 as described below, the outer peripheral surface 34 of the ferrite core 16 and the protruding end surface of the flange plate portion 76 are positioned on the same curved surface that is generally oval, as shown in FIGS. 4 and 7 .

[0040] In particular, in the first embodiment, a through hole 78 that penetrates in the plate thickness direction (front-rear direction) is formed in the portion of the flange plate portion 76 that protrudes upward from the upper wall portion 52. This through hole 78 is provided in the portion of the flange plate portion 76 on the protruding base end side (inner peripheral side), has a substantially rectangular shape, and is formed in the left-right central portion of the flange plate portion 76 and the upper wall portion 52. By forming the through hole 78 in the flange plate portion 76, when the ferrite core 16 and the cover cylindrical portion 48 are inserted into the inner hole forming cylindrical portion 50 described below, air inside the ferrite core 16 and the cover cylindrical portion 48 is discharged to the outside of the magnetic material fixing jig 46 through the through hole 78.

[0041] Furthermore, an elastic locking portion 80 that can bend and deform (elastically deform in the first embodiment) inward in the first orthogonal direction (vertical direction) is provided on the other axial end (front end) side of the outer peripheral surface 74 of the inner hole forming cylindrical portion 50. In the first embodiment, a pair of slits 82, 82 are provided spaced apart from each other in the left-right direction in the central portion of the front end of the upper wall portion 52, and each slit 82 extends rearward with a predetermined length (front-rear dimension). An elastic locking portion 80 that can be elastically deformed in the vertical direction is formed between the left-right sides of each slit 82. In other words, the elastic locking portion 80 is provided so as to protrude forward from the central portion of the front end of the upper wall portion 52 in the left-right direction.

[0042] An upwardly protruding locking claw 83 is formed at the protruding tip (front end) of the elastic locking portion 80. The rear end surface of the locking claw 83 is a flat surface 84 that extends in a direction perpendicular to the front-to-rear direction, and the front end surface of the locking claw 83 is an inclined surface 85 that gradually protrudes upward toward the rear. That is, the flat surface 84 of the locking claw 83 and the upper portion of the flange plate portion 76 face each other at a predetermined distance in the front-to-rear direction. A front-to-rear opposing distance A (see FIG. 4) between the flat surface 84 and the front end surface of the flange plate portion 76 is larger than the front-to-rear dimension of the ferrite core 16. A front-to-rear separation distance B (see FIG. 4) between the flat surface 84 and the rear end surface of the flange plate portion 76 is slightly larger than the front-to-rear dimension of the cover tubular portion 48.

[0043] <Cover Tube Portion 48> The cover tube portion 48 is a member formed separately from the magnetic body fixing jig 46 and is configured to cover the outer peripheral surface 34 and the other axial end face (front end surface 32) of the ferrite core 16, which is fitted around the inner bore forming tube portion 50. That is, the cover tube portion 48 has a generally elongated cylindrical shape extending in the front-to-rear direction as a whole. The cover tube portion 48 includes a peripheral wall portion 86 that extends continuously in the circumferential direction and has a generally oval cross section, and a generally annular front wall portion 88 that protrudes radially inward (toward the inner periphery) from the front end of the peripheral wall portion 86. The inner diameter of the inner peripheral surface 89 of the peripheral wall portion 86 is slightly larger than the outer diameter of the ferrite core 16 and the protrusion of the flange plate portion 76 toward the outer periphery. Furthermore, a central hole 90, through which the inner bore forming tube portion 50 of the magnetic body fixing jig 46 is inserted, is formed in the center of the front wall portion 88 and penetrates in the thickness direction (front-to-rear direction).

[0044] As a result, when the cover tubular portion 48 is assembled to the magnetic material fixing jig 46 on which the ferrite core 16 is fitted, the outer peripheral surface 34 of the ferrite core 16 is covered from the outer periphery by the peripheral wall portion 86 of the cover tubular portion 48, and the front end surface 32 of the ferrite core 16 is covered from the front by the front wall portion 88 of the cover tubular portion 48. In the first embodiment, when the cover tubular portion 48 is assembled to the magnetic material fixing jig 46 on which the ferrite core 16 is fitted, the rear end surface 30 of the ferrite core 16 abuts against the flange plate portion 76 (the ferrite core 16 is in the assembly end position E), and the peripheral wall portion 86 of the cover tubular portion 48 covers not only the ferrite core 16 but also the flange plate portion 76 from the outer periphery. 4, in particular, in the first embodiment, the inner circumferential surface 89 at one axial end (rear end) of the tubular cover portion 48 and the protruding end face of the flange plate portion 76 are close to each other and face each other in the radial direction with a small gap between them. Note that the inner circumferential surface 89 at the rear end of the tubular cover portion 48 and the protruding end face of the flange plate portion 76 may overlap each other.

[0045] In short, the magnetic-body-equipped busbar assembly 10 of the first embodiment has an overall double-tubular shape extending in the front-rear direction, and the region between the cover tube portion 48, which is an outer tubular body, and the inner bore-forming tube portion 50 (magnetic body fixing jig 46), which is an inner tubular body, forms an annular magnetic body accommodating tube portion 36, and the ferrite core 16 is accommodated in this magnetic body accommodating tube portion 36. The inner bore 38 of the magnetic body accommodating tube portion 36 is defined by a hole that axially penetrates the inner bore-forming tube portion 50, which is the inner tubular body, and an insulating partition wall 40 is disposed within the inner bore 38 to define the positive and negative busbar accommodating portions 42, 44. Therefore, the inner circumferential surface of the ferrite core 16 is covered by the inner bore-forming tube portion 50, and the outer circumferential surface 34 of the ferrite core 16 is covered by the peripheral wall portion 86 of the cover tube portion 48. Furthermore, the rear end surface 30 of the ferrite core 16 is covered by the flange plate portion 76, and the front end surface 32 of the ferrite core 16 is covered by the front wall portion 88 of the cover tubular portion 48. As a result, in the first embodiment, the inner hole forming tubular portion 50, the flange plate portion 76, and the cover tubular portion 48 cover the entire periphery of the ferrite core 16.

[0046] The protrusion dimension of the front wall portion 88 toward the inner periphery is not limited, but is set to be approximately equal to the radial width dimension of the ferrite core 16. As a result, when the cover tubular portion 48 is fitted onto the ferrite core 16 that is fitted onto the inner hole forming tubular portion 50 as described below and assembled to the magnetic material fixing jig 46, the inner periphery surface of the ferrite core 16 and the inner periphery end face of the front wall portion 88 are positioned on the same approximately rectangular plane, as shown in FIG.

[0047] In the first embodiment, the inner circumferential surface 89 of the peripheral wall portion 86 of the cover tubular portion 48 is provided with abutment ribs 92 that protrude inward and extend in the front-rear direction from the front end with a predetermined front-rear dimension. In particular, in the first embodiment, the inner circumferential surface 89 of the peripheral wall portion 86 is provided with a plurality of abutment ribs 92, and the abutment ribs 92 are arranged spaced apart from one another in the circumferential direction. As a result, when the cover tubular portion 48 is fitted onto the ferrite core 16, the protruding tips (inner circumferential ends) of the abutment ribs 92 come into contact with the outer circumferential surface 34 of the ferrite core 16. In other words, when the cover tubular portion 48 is fitted onto the ferrite core 16 and assembled to the magnetic body fixing jig 46, the protruding tips (inner circumferential ends) of the abutment ribs 92 are in sliding contact with the outer circumferential surface 34 of the ferrite core 16, and the cover tubular portion 48 is displaceable in the axial direction (front-rear direction) relative to the magnetic body fixing jig 46. This can prevent the cover tubular portion 48 from rattling relative to the ferrite core 16 .

[0048] In addition, a plurality of abutment ribs 94 that protrude outward and extend in the vertical direction are provided on the outer peripheral surface of the peripheral wall portion 86 of the cover tube portion 48, and when the magnetic busbar assembly 10 is mounted on a vehicle (not shown), for example, each abutment rib 94 may be brought into contact with a member to be mounted.

[0049] <Method of Assembling Busbar Assembly 10 with Magnetic Body> A specific example of a method of assembling the busbar assembly 10 with magnetic body will be described below. Note that the method of manufacturing the busbar assembly 10 with magnetic body is not limited to the embodiment described below.

[0050] First, the ferrite core 16 is brought closer to the magnetic body fixing jig 46 shown in FIG. 6 from behind, and the front portion of the magnetic body fixing jig 46 is inserted into the internal space 27 of the ferrite core 16. The upper portion of the inner peripheral edge of the ferrite core 16 abuts against the inclined surface 85 of the locking claw 83 of the elastic locking portion 80 that protrudes forward from the inner hole forming tubular portion 50, causing the elastic locking portion 80 to elastically deform downward, allowing further insertion of the magnetic body fixing jig 46. When the locking claw 83 of the elastic locking portion 80 passes through the internal space 27 of the ferrite core 16, the elastic locking portion 80 elastically deforms and returns to its initial shape. Insertion of the magnetic body fixing jig 46 into the internal space 27 of the ferrite core 16, i.e., rearward displacement of the ferrite core 16 relative to the magnetic body fixing jig 46, is limited by the abutment of the rear end surface 30 of the ferrite core 16 with the flange plate portion 76. 7 , when the rear end surface 30 of the ferrite core 16 abuts against the flange plate portion 76 (when the ferrite core 16 is in the assembly end position E), the ferrite core 16 is fitted onto the inner hole forming cylindrical portion 50 of the magnetic material fixing jig 46. In this state, the front end surface 32 of the ferrite core 16 abuts against the flat surface 84 of the locking claw 83, preventing the ferrite core 16 from falling off from the magnetic material fixing jig 46.

[0051] 7 (when the ferrite core 16 is in the assembly end position E), the cover tube portion 48 is moved toward the rear, and the front portion of the magnetic body fixing jig 46 is inserted into the central hole 90 of the cover tube portion 48. The upper portion of the central hole 90 of the cover tube portion 48 comes into contact with the inclined surface 85 of the locking claw 83 of the elastic locking portion 80, causing the elastic locking portion 80 to elastically deform downward, allowing further insertion of the magnetic body fixing jig 46. When the locking claw 83 of the elastic locking portion 80 passes through the central hole 90, the elastic locking portion 80 elastically deforms and returns to its initial shape. Insertion of the magnetic body fixing jig 46 into the central hole 90, i.e., rearward displacement of the cover tube portion 48 relative to the magnetic body fixing jig 46, is limited, for example, by the front wall portion 88 of the cover tube portion 48 abutting against the front end face 32 of the ferrite core 16. Therefore, in embodiment 1, the cover tube portion 48 that is inserted onto the ferrite core 16 can be assembled from the other axial end side (front end side) of the inner hole forming tube portion 50 toward the one axial end side (rear end side) by elastic deformation of the elastic locking portion 80.

[0052] As shown in FIG. 8 , when the rearward displacement of the cover tubular portion 48 is complete, the outer peripheral surface 34 and the front end surface 32 of the ferrite core 16 are covered by the cover tubular portion 48. In particular, in the state shown in FIG. 8 , not only the ferrite core 16 but also the flange plate portion 76 are covered by the cover tubular portion 48, and the inner peripheral surface 89 of the rear opening portion of the peripheral wall portion 86 and the protruding end surface of the flange plate portion 76 are closely opposed to each other in the radial direction. Furthermore, in this state, the front wall portion 88 of the cover tubular portion 48 abuts against the flat surface 84 of the locking claw 83, preventing the cover tubular portion 48 from falling off the magnetic material fixing jig 46. In other words, the elastic locking portion 80 elastically returns to its initial shape, so that the ferrite core 16 and the cover tubular portion 48 are positioned and held in the axial direction between the locking claw 83 of the elastic locking portion 80 and the flange plate portion 76. In this way, the insulating holding member 18 is formed by assembling the cover tubular portion 48 to the magnetic material fixing jig 46 .

[0053] 8 , the positive busbar 12 is inserted from the rear into the positive busbar accommodating portion 42 of the insulating holding member 18, as shown in FIG. 9 . That is, the positive busbar 12 is placed over the rear portion of the insulating partition wall 40 shown in FIG. 8 from above, and the positive busbar 12 is slid forward. As the positive busbar 12 is pushed forward, the left and right elastic engaged portions 64, 64 provided at the rear end of the positive busbar accommodating portion 42 are elastically deformed leftward and upward, respectively, allowing further insertion of the positive busbar 12. Then, while the front portion of the positive busbar 12 is supported by the positive support accommodating portion 62, when each elastic engaged portion 64 reaches each positive engaging portion 24, the elastic engaged portion 64 elastically returns to its original position and engages with each positive engaging portion 24. This prevents the positive bus bar 12 from being displaced in the axial direction relative to the insulating holding member 18 .

[0054] Similarly, from the state shown in FIG. 8 , the negative busbar 14 is inserted from the front into the negative busbar accommodating portion 44 of the insulating holding member 18 as shown in FIG. 1 . That is, the negative busbar 14 is placed on the front portion of the insulating partition wall 40 from below, and then slid rearward. The negative busbar 14 being pushed rearward causes the left and right elastic engaged portions 70, 70 provided at the front end of the negative busbar accommodating portion 44 to elastically deform outward in the left-right direction, allowing further insertion of the negative busbar 14. Then, while the rear portion of the negative busbar 14 is supported by the negative support-accommodating portion 68, when each elastic engaged portion 70 reaches each negative engaging portion 26, the elastic engaged portion 70 elastically returns to its original position and engages with each negative engaging portion 26. This prevents axial displacement of the negative busbar 14 relative to the insulating holding member 18. As a result, the magnetic body-equipped busbar assembly 10 according to the first embodiment is completed.

[0055] In the magnetic body-equipped busbar assembly 10 manufactured in this manner, for example, one longitudinal end (e.g., rear end) of each of the positive and negative busbars 12, 14 is electrically connected to a motor (not shown), and the other longitudinal end (e.g., front end) is electrically connected to a PCU (not shown). The magnetic body-equipped busbar assembly 10 is fixed to an electrical junction box or the like mounted on a vehicle. The electrical connection and fixation to the vehicle are achieved, for example, by inserting bolts (not shown) into the bolt insertion holes 20. As a result, the ferrite core 16 can suppress power transmission noise between multiple on-vehicle components connected by the magnetic body-equipped busbar assembly 10 (e.g., between a motor and a PCU).

[0056] According to the magnetic body-equipped busbar assembly 10 of the first embodiment, the positive and negative busbar accommodating portions 42, 44 that accommodate the positive and negative busbars 12, 14 are arranged separated by the insulating partition wall 40, thereby preventing the positive and negative busbars 12, 14 from coming into contact with each other and causing an electrical short circuit in the power transmission path between the on-vehicle components.

[0057] In particular, each busbar accommodating portion 42, 44 has a horizontally elongated shape with a width greater than a height, and these horizontally elongated busbar accommodating portions 42, 44 are stacked in a first orthogonal direction (vertical direction) that is the height direction. This reduces the space required to configure each busbar accommodating portion 42, 44, particularly in the width direction (horizontal direction). As a result, the ferrite core 16 inserted around each busbar 12, 14, and thus the magnetic-body-equipped busbar assembly 10, can be made smaller.

[0058] The magnetic body fixing jig 46 includes an inner hole forming cylindrical portion 50 in which the bus bar accommodating portions 42, 44 are formed, a flange plate portion 76, and an elastic locking portion 80. When the ferrite core 16 is fitted onto the inner hole forming cylindrical portion 50, the ferrite core 16 is fitted onto the magnetic body fixing jig 46 from the front, causing the elastic locking portion 80 to elastically deform downward. The elastic locking portion 80 then passes through the internal space of the ferrite core 16, causing the elastic locking portion 80 to elastically return to its original position, and the ferrite core 16 is locked by the locking claws 83. The ferrite core 16 reaches the assembly end position E by abutting against the flange plate portion 76. The ferrite core 16 at the assembly end position E is covered by the cover cylindrical portion 48. The cover cylindrical portion 48 is fitted onto the ferrite core 16 using the elastic locking portion 80, similar to the ferrite core 16. In this way, by using the elastic locking portion 80 to assemble the ferrite core 16 and the cylindrical cover portion 48, the assembly can be easily achieved.

[0059] In particular, when the tubular cover portion 48 is fitted onto the ferrite core 16, the inner circumferential surface 89 at the rear opening of the tubular cover portion 48 covers the protruding end face of the flange plate portion 76 from the outer periphery, and in the first embodiment, the inner circumferential surface 89 at the rear opening of the tubular cover portion 48 and the protruding end face of the flange plate portion 76 are close to each other. This ensures a relatively large creepage distance between the ferrite core 16 disposed inside the tubular cover portion 48 and a bus bar (e.g., the positive bus bar 12) disposed outside the tubular cover portion 48, thereby ensuring insulation between the ferrite core 16 and the positive bus bar 12. As a result, there is no need to increase the separation distance between the ferrite core 16 and the positive bus bar 12, and the magnetic-body-equipped bus bar assembly 10 can be further miniaturized.

[0060] The positive busbar accommodating portion 42 includes a positive support accommodating portion 62 including the insulating partition wall 40 and each side wall portion 60, and elastic engaged portions 64 that prevent axial (front-rear) displacement of the positive busbar 12. This allows the positive busbar 12 inserted into the positive busbar accommodating portion 42 to be stably held. Similarly, the negative busbar accommodating portion 44 includes a negative support accommodating portion 68 including the insulating partition wall 40 and each side wall portion 60, and elastic engaged portions 70 that prevent axial (front-rear) displacement of the negative busbar 14. This allows the negative busbar 14 inserted into the negative busbar accommodating portion 44 to be stably held.

[0061] <Other Embodiments> Although the first embodiment has been described above in detail as a specific example of the present disclosure, the present disclosure is not limited to this specific description. Modifications, improvements, etc. within the scope that can achieve the object of the present disclosure are included in the present disclosure. For example, the following modifications of the embodiment are also included in the technical scope of the present disclosure.

[0062] (1) In the above embodiment, the ferrite core 16 is used as an example of the annular magnetic body that is inserted around each bus bar 12, 14. However, this is not limited to this, and any known annular magnetic body, such as one made of a nanocrystalline soft magnetic material, may be used. Note that the magnetic body does not need to be strictly annular, as long as it is annular as a whole. The annular magnetic body may have a substantially C-shaped cross section with a slit on a portion of the circumference, or may be formed by overlapping a pair of cylindrical halves of magnetic body to form an annular magnetic body as a whole.

[0063] (2) In the above embodiment, the busbar accommodating portions 42, 44 are stacked in the first orthogonal direction (vertical direction), but a pair of busbar accommodating portions may be stacked in the second orthogonal direction (horizontal direction). Stacking the busbar accommodating portions 42, 44 in the vertical direction as in the above embodiment reduces the size of the magnetic-body-equipped busbar assembly 10 in the horizontal direction, but stacking the busbar accommodating portions in the horizontal direction reduces the size of the magnetic-body-equipped busbar assembly in the vertical direction.

[0064] (3) In the above embodiment, the rearward displacement of the tubular cover portion 48 fitted onto the ferrite core 16 is limited by, for example, the front wall portion 88 of the tubular cover portion 48 abutting against the front end surface 32 of the ferrite core 16, and when the assembly of the tubular cover portion 48 is complete, the peripheral wall portion 86 of the tubular cover portion 48 covers the flange plate portion 76 from the outer periphery. However, this is not limited to this. For example, the flange plate portion may protrude outwardly more than in the above embodiment, and the rearward displacement of the tubular cover portion may be limited by the abutment of the rear end surface of the tubular cover portion with the flange plate portion.

[0065] (4) The specific shapes of the pair of bus bars (positive and negative bus bars 12, 14) are not limited. In the above embodiment, the rear portion of the positive bus bar 12 has a bent portion 22 that bends upward, and this bent portion 22 forms the positive electrode engaging portion 24 that engages with the elastic engaged portion 64. However, the positive electrode bus bar may extend straight, for example, or may have a left-side positive electrode engaging portion that opens to the left and engages with the left-side elastic engaged portion. Furthermore, in the above embodiment, each bus bar 12, 14 is formed by stacking two bus bars of approximately the same shape, but this is not limited to this. Each bus bar may be formed by a single bus bar or three or more bus bars. Furthermore, in the above embodiment, the bus bars 12, 14 are inserted into the bus bar accommodating portions 42, 44 in opposite directions. However, depending on the shape of each bus bar, the bus bars may be inserted into the bus bar accommodating portions in the same direction.

[0066] REFERENCE SIGNS LIST 10 Busbar assembly with magnetic body 12 Positive electrode side busbar (busbar) 14 Negative electrode side busbar (busbar) 16 Ferrite core (magnetic body) 18 Insulating holding member 20 Bolt insertion hole 22 Bent portion 24 Positive electrode side engaging portion (engaging portion) 26 Negative electrode side engaging portion (engaging portion) 27 Internal space 28 Peripheral wall 30 Rear end face (end face on one axial end side) 32 Front end face (end face on the other axial end side) 34 Outer circumferential surface 36 Magnetic body accommodating cylindrical portion 38 Inner hole 40 Insulating partition wall 42 Positive electrode side busbar accommodating portion (busbar accommodating portion provided on one side of insulating partition wall) 44 Negative electrode side busbar accommodating portion (busbar accommodating portion provided on the other side of insulating partition wall) 46 Magnetic body fixing jig 48 Cover cylindrical portion 50 Inner hole forming cylindrical portion 52 Upper wall portion 54 Lower wall portion 56 Left wall portion 58 Right wall portion 60 Side wall portion 62 Positive electrode side support accommodation portion (support accommodation portion) 64 Elastic engaged portion 66 Engaging claw 68 Negative electrode side support accommodation portion (support accommodation portion) 70 Elastic engaged portion 72 Engaging claw 74 Outer circumferential surface 76 Flange plate portion 78 Through hole 80 Elastic lock portion 82 Slit 83 Locking claw 84 Flat surface 85 Inclined surface 86 Peripheral wall portion 88 Front wall portion 89 Inner circumferential surface 90 Central hole 92, 94 Contact rib E Assembly end position

Claims

1. A busbar assembly with a magnetic body comprising: a pair of busbars; an annular magnetic body fitted onto the pair of busbars; and an insulating retaining member that holds the pair of busbars and the magnetic body in a non-contact state, wherein the insulating retaining member has an annular magnetic body accommodating cylindrical portion in which the magnetic body is accommodated, and a pair of busbar accommodating portions in which the pair of busbars are respectively accommodated, the pair of busbars being separated by an insulating partition wall that extends axially through an inner hole of the magnetic body accommodating cylindrical portion.

2. The magnetic body-equipped busbar assembly as described in claim 1, wherein the pair of busbar accommodating portions are stacked in a first orthogonal direction perpendicular to the axial direction of the magnetic body accommodating cylindrical portion, separated by the insulating partition wall, and each of the busbar accommodating portions has a height dimension in the same direction as the first orthogonal direction that is greater than the plate thickness dimension of each of the busbars, and a width dimension in a second orthogonal direction that is greater than the plate width dimension of each of the busbars and greater than the height dimension.

3. The magnetic body accommodating cylindrical portion of the insulating holding member comprises: an inner hole forming cylindrical portion that constitutes the inner hole of the magnetic body accommodating cylindrical portion and extends in the axial direction with a rectangular frame cross section that is flattened in a first orthogonal direction perpendicular to the axial direction; a flange plate portion that protrudes outward from an outer circumferential surface of one axial end side of the inner hole forming cylindrical portion; an elastic lock portion that is formed on the outer circumferential surface of the other axial end side of the inner hole forming cylindrical portion and is capable of flexibly deforming inward in the first orthogonal direction; and a cover cylindrical portion that covers the outer circumferential surface of the magnetic body of a rectangular frame shape that is inserted onto the inner hole forming cylindrical portion and an end face of the other axial end side, and the cover cylindrical portion inserted onto the magnetic body can be assembled from the other axial end side of the inner hole forming cylindrical portion toward the one axial end side by the flexural deformation of the elastic lock portion, 3. The busbar assembly with magnetic body according to claim 1 or 2, wherein at an assembly end position where an end face of the magnetic body at one axial end abuts the flange plate portion, the elastic locking portion elastically returns to its original state, so that the magnetic body and the cover tube portion are positioned and held in the axial direction between the elastic locking portion and the flange plate portion, and the magnetic body is covered around its entire circumference by the inner hole forming tube portion, the flange plate portion, and the cover tube portion.

4. A busbar assembly with magnetic material according to claim 3, wherein the inner peripheral surface of the one axial end of the cylindrical cover portion covers the protruding end face of the flange plate portion from the outer peripheral side.

5. The busbar assembly with magnetic material as described in claim 1 or 2, wherein the busbar accommodating portion provided on one side of the insulating partition has a support accommodating portion constituted by the insulating partition protruding toward the other axial end side of the magnetic material accommodating cylindrical portion and a pair of side wall portions protruding from both side edges of the insulating partition, and a resilient engaged portion protruding toward the one axial end side of the magnetic material accommodating cylindrical portion and flexibly deforming to allow insertion of the busbar from the one axial end side to the other axial end side of the busbar accommodating portion and elastically returning to its original state to engage with an engaging portion provided on the busbar to prevent displacement of the busbar in the axial direction.

6. The busbar assembly with magnetic material as described in claim 1 or 2, wherein the busbar accommodating portion provided on the other side of the insulating partition has a support accommodating portion constituted by the insulating partition protruding toward the one axial end side of the magnetic material accommodating cylindrical portion and a pair of side wall portions protruding from both side edges of the insulating partition, and a resilient engaged portion protruding toward the other axial end side of the magnetic material accommodating cylindrical portion and flexibly deforming to allow insertion of the busbar from the other axial end side to the one axial end side of the busbar accommodating portion and elastically returning to its original state to engage with an engaging portion provided on the busbar to prevent displacement of the busbar in the axial direction.

Images