Bus bar assembly with magnetic material

Abstract

To provide a bus bar assembly with magnetic material capable of suppressing contact between a pair of bus bars.SOLUTION: A bus bar assembly 10 with magnetic material includes a pair of bus bars 12, 14, an annular magnetic material 16 extrapolated on the pair of bus bars 12, 14, and an insulating holding member 18 that holds the pair of bus bars 12, 14 and the magnetic material 16 in a state in which they are not in contact with each other. The insulating holding member 18 has an annular magnetic material storage tube portion 36 that accommodates the magnetic material 16 and a pair of bus bar accommodating portions 42, 44 arranged across an insulating partition wall 40 extending in the axial direction and penetrating through an inner hole 38 of the magnetic material storage tube portion 36 and in which the pair of bus bars 12, 14 are respectively accommodated.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] Busbars through which a large current flows are arranged in vehicles that are driven by a motor, such as electric vehicles and hybrid vehicles. In order to eliminate noise from such busbars, Patent Document 1 proposes the use of a busbar assembly with a magnetic body in which a ring-shaped magnetic body such as a ferrite core is inserted around the busbar. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-186406 A Summary of the Invention [Problem to be solved by the invention]

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

[0005] In view of this, a busbar assembly with magnetic material is disclosed that can prevent contact between a pair of busbars. [Means for solving the problem]

[0006] The magnetic body-equipped busbar assembly of the present disclosure comprises 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 that extends axially through an inner hole of the magnetic body accommodating cylindrical portion and in which the pair of busbars are respectively accommodated. Effect of the Invention

[0007] According to the busbar assembly with magnetic body of the present disclosure, contact between the pair of busbars can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a bus bar assembly with magnetic bodies according to the first embodiment. [Diagram 2] FIG. 2 is a plan view of the bus bar assembly with magnetic bodies shown in FIG. [Diagram 3] FIG. 3 is a bottom view of the bus bar assembly with magnetic bodies shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 5 is an enlarged longitudinal sectional view showing the VV cross section in FIG. 2. FIG. [Figure 6] FIG. 6 is a perspective view showing a magnetic body fixing jig that constitutes an insulating holding member of the bus bar assembly with magnetic body shown in FIG. [Figure 7] 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. [Figure 8] FIG. 8 is a perspective view showing a state in which the cover cylinder portion is fitted onto the magnetic body shown in FIG. 7 and the magnetic body is housed within the insulating holder. [Figure 9] FIG. 9 is a perspective view showing a state in which one of a pair of bus bars is attached to the insulating holder shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Description of the embodiments of the present disclosure> First, embodiments of the present disclosure will be listed and described. The magnetic body-equipped bus bar assembly according to the present disclosure includes: (1) A magnetic bearing comprising a pair of bus bars, an annular magnetic body that is 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, the insulating retaining member having an annular magnetic body accommodating cylindrical portion in which the magnetic body is accommodated, and a pair of bus bar accommodating portions that are arranged across an insulating partition that extends axially through an inner hole of the magnetic body accommodating cylindrical portion and in which the pair of bus bars are respectively accommodated.

[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 retaining member. Moreover, the insulating retaining member is provided with a pair of busbar accommodating portions separated by an insulating partition wall that extends axially through the inner hole of the magnetic body accommodating cylindrical portion, and each busbar is accommodated in each busbar accommodating portion. Therefore, compared to a conventional structure in which the pair of busbars that pass through the inner hole are separated only by a space, it is possible to reduce or avoid the risk of the pair of busbars coming into contact with each other.

[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 item (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 cylinder 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 larger than a plate thickness dimension of each of the busbars, and has a width dimension in a second orthogonal direction that is larger than a plate width dimension of each of the busbars and larger than the height dimension.

[0013] Since the pair of busbar accommodating sections are arranged across an insulating partition wall, the insulation of the pair of busbars accommodated therein can be advantageously ensured even if the busbar accommodating sections are stacked in a first orthogonal direction (e.g., vertical direction) perpendicular to the axial direction of the magnetic body accommodating cylinder section. Moreover, the height dimension of each busbar accommodating section extending in the first orthogonal direction is larger than the plate thickness dimension of the busbar, and the width dimension of each busbar accommodating section extending in a second orthogonal direction perpendicular to the first orthogonal direction is larger than the plate width dimension of the busbar and is larger than the height dimension. That is, the pair of busbar accommodating sections stacked in the first orthogonal direction are set to have height and width dimensions that accommodate the busbar in a flat state (plate thickness direction is the first orthogonal direction, e.g., vertical direction). As a result, compared to a conventional structure in which stacking in the first orthogonal direction (e.g., vertical direction) is difficult, it is possible to advantageously achieve a reduction in size of the magnetic body-equipped busbar assembly in the first orthogonal direction while ensuring insulation.

[0014] (3) In the above (1) or (2), the magnetic body accommodating cylindrical portion of the insulating retaining 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 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 flexible and deformable inward in the first orthogonal direction, and a cover cylindrical portion that covers the outer circumferential surface of the magnetic body having a rectangular frame shape that is inserted outside 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 of the one axial end side of the magnetic body abuts the flange plate portion, the elastic locking portion elastically returns to its original state, so that 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 around 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 divided into (i) an inner hole forming cylindrical portion and a flange plate portion protruding from one axial end side of the inner hole forming cylindrical portion, and (ii) a cover cylindrical portion covering the outer circumferential surface and the end face on the other axial end side, and the magnetic body and the cover cylindrical portion are configured to be assembled to the inner hole forming cylindrical portion from the other axial end side, thereby providing a magnetic body accommodating cylindrical portion with excellent manufacturability and assembly workability. In particular, by providing an elastic locking portion on the other end side of the inner hole forming cylindrical portion, it is possible to stably achieve assembly of the cover cylindrical portion in the axial direction by the bending deformation of the elastic locking portion, and stable positioning and retention of the magnetic body and the cover cylindrical portion by the elastic return of the elastic locking portion.

[0016] (4) In the above item (3), it is preferable that 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 periphery side. This is because 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 periphery side, 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 side of the magnetic material accommodating cylindrical portion and a pair of side wall portions protruding from both side edges of the insulating partition wall, and an elastic engaged portion that protrudes toward the one axial end side of the magnetic material accommodating cylindrical portion and flexes and deforms 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 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] A busbar accommodating section is provided on one side of the insulating partition wall and accommodates a busbar that penetrates the magnetic body accommodating cylindrical section from one axial end side to the other axial end side of the magnetic body accommodating cylindrical section. The busbar accommodating section is provided with a support accommodating section that includes the insulating partition wall protruding toward the other axial end side and a pair of side wall portions protruding from both side edges of the support accommodating section. This allows the busbar to axially penetrate the magnetic body accommodating cylindrical section while being supported by the support accommodating section with respect to the busbar accommodating section provided on one side. Moreover, at the one axial end side that is opposite to the insertion direction of the busbar, an elastic engaged section is provided that flexibly deforms to allow the busbar to be inserted and then elastically returns to its original shape to engage with the engaging section of the busbar to prevent displacement of the busbar in the axial direction. This allows the busbar accommodated in the busbar accommodating section provided on one side of the insulating partition wall to be stably and fixedly 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 configured to include the insulating partition wall 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 wall, and an elastic engaged portion that protrudes toward the other axial end side of the magnetic material accommodating cylindrical portion and flexes and deforms 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 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 and that accommodates a busbar penetrating the magnetic body accommodating cylindrical portion from the other axial end side to the one end side of the magnetic body accommodating cylindrical portion, by providing a support accommodating portion and an elastic engaged portion as in the above (5), it is possible to achieve an effect similar to that of the above (5). Therefore, by adopting a combination of the above (5) and this 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 embodiment 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] <Embodiment 1> A busbar assembly 10 with a magnetic body according to a first embodiment of the present disclosure will be described below with reference to Fig. 1 to Fig. 9. The busbar assembly 10 with a magnetic body is provided in, for example, an electric connection 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 body that is extrapolated onto each of the busbars 12, 14. Both ends of each of the busbars 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 in power transmission between the on-board components through 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, upper refers to upper in Fig. 4, lower refers to lower in Fig. 4, left refers to upper in Fig. 2, right refers to lower in Fig. 2, front refers to left in Fig. 2, and rear refers to right in Fig. 2. In addition, for multiple identical components, reference numerals may be given to only some of the components and the reference numerals may be omitted for the other components.

[0023] <Magnetic body-attached bus bar assembly 10> As described above, the busbar assembly 10 with magnetic body includes the pair of busbars, i.e., the positive and negative busbars 12, 14, and the ferrite core 16 as an annular magnetic body that is inserted around each of the busbars 12, 14. The busbar assembly 10 with magnetic body also includes an insulating holding member 18 that holds the pair of busbars (the positive and negative busbars 12, 14) and the magnetic body (the ferrite core 16) in a non-contact state. In the first embodiment, the positive busbar 12 and the negative busbar 14 are each configured by stacking two busbars having substantially the same shape, but in the following description, each will be described as a single positive busbar 12 and a single negative busbar 14. The two busbars that constitute the positive and negative busbars 12, 14 may be fixed to each other by welding or the like, or may simply be stacked on top of each other without being fixed to each other.

[0024] <A pair of bus bars (positive and negative bus bars 12, 14)> The positive and negative busbars 12, 14 are formed by pressing a conductive metal plate into a predetermined shape, and each extends in the front-rear direction as a whole. At both ends of the length of each busbar 12, 14, a plurality of bolt insertion holes 20 are formed penetrating each busbar 12, 14 in the thickness direction (vertical direction). The positive busbar 12 has a bent portion 22 that bends upward at the rear portion. At the right end of the rear portion of the positive busbar 12, which is forward of the bent portion 22, a positive engaging portion 24 is provided as a notched engaging portion that opens to the right and penetrates in the vertical direction. On the other hand, the negative busbar 14 has negative engaging portions 26, 26 as notched engaging portions that open outward in the horizontal direction and penetrate in the vertical direction at both left and right sides of the front portion.

[0025] <Magnetic material (ferrite core 16)> 4 and 5, the ferrite core 16 is generally annular, 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 dimension and maximum left-right dimension of the internal space 27 are slightly greater than the up-down dimension and left-right dimension of an internal hole 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 dimension in the front-rear direction. That is, the ferrite core 16 is generally cylindrical and has 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 spreads in a substantially annular shape as an end face on one axial end side in the front-rear 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 spreads in a substantially annular shape as an end face on the other axial end side. In addition, the ferrite core 16 has an outer peripheral surface 34 that spreads in a substantially rectangular frame shape or a substantially elongated cylindrical shape between the rear end face 30 and the front end face 32 in the front-rear direction. A known material is used for the ferrite core 16, but in the first embodiment, the ferrite core 16 is formed of Mn-Zn ferrite.

[0027] <Insulating holding member 18> The insulating holding member 18 has an annular magnetic body accommodating tube 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 tube portion 36. The insulating holding member 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 arranged separated by the insulating partition wall 40 and that respectively accommodate the pair of busbars (the positive and negative busbars 12, 14) described above. These positive and negative busbar accommodating portions 42, 44 are arranged in a stacked manner 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 tube portion 36. In the first embodiment, a positive busbar accommodating portion 42 is provided on one side, that is, the upper side, of the insulating partition wall 40, and a negative busbar accommodating portion 44 is provided on the other side, that is, 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 tube portion 48 that covers the outer peripheral surface 34 and the end surface (front end surface 32) of the other axial end side of the magnetic body (ferrite core 16). The magnetic body fixing jig 46 and the cover tube portion 48 are formed of, for example, a hard synthetic resin having insulating properties. The magnetic body fixing jig 46 has the insulating partition wall 40 and the positive and negative busbar accommodating portions 42, 44. As described later, the cover tube portion 48 is assembled to the magnetic body fixing jig 46 to form the magnetic body accommodating tube portion 36. That is, the annular magnetic body accommodating tube portion 36 is formed by a region between the magnetic body fixing jig 46 provided on the inner peripheral side and the cover tube portion 48 provided on the outer peripheral side in the radial direction, and the inner hole 38 of the magnetic body accommodating tube portion 36 that penetrates the magnetic body fixing jig 46 in the axial direction (front-rear direction) is formed.

[0029] <Magnetic Fixture 46> The magnetic body fixing jig 46 constituting the magnetic body accommodating tube portion 36 is provided with an inner hole forming tube portion 50 which forms the inner hole 38 of the magnetic body accommodating tube portion 36 and extends in the axial direction (front-rear direction) with a rectangular frame cross section flattened in the first orthogonal direction (up-down direction). The inner hole forming tube 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, a left wall portion 56 on both the left and right sides, and a right wall portion 58 on both the left and right sides. Each of these walls 52, 54, 56, 58 has a substantially constant thickness dimension over substantially the entire length in the front-rear direction, and the shapes of the inner peripheral surface and the outer peripheral surface are both formed into a horizontally elongated rectangular tube shape in which the left-right dimension is larger than the up-down dimension. The insulating partition wall 40 extends axially through the inner hole 38 of the magnetic body accommodating cylindrical portion 36 formed by these walls 52, 54, 56, 58, and divides the inner hole 38 in the vertical direction by the insulating partition wall 40. That is, the positive electrode side busbar accommodating portion 42 is defined by including the portion of the inner hole 38 above the insulating partition wall 40, and the negative electrode side busbar accommodating portion 44 is defined by including the portion of the inner hole 38 below the insulating partition wall 40.

[0030] <Insulating bulkhead 40> The insulating partition wall 40 has a generally flat plate shape with a rectangular cross section, and the left-right dimension is larger than the 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 cylinder portion 50, respectively. As a result, the positive electrode side busbar accommodating portion 42 is formed including the upper wall portion 52, the upper parts of the left wall portion 56 and the right wall portion 58, and the region surrounded by the insulating partition wall 40, and the negative electrode side busbar accommodating portion 44 is formed including the lower wall portion 54, the lower parts of the left wall portion 56 and the right wall portion 58, and the region surrounded by the insulating partition wall 40. The insulating partition wall 40 has a length dimension (front-rear dimension) longer than the magnetic body accommodating cylinder portion 36, and the insulating partition wall 40 protrudes on both sides in the front-rear direction beyond the magnetic body accommodating cylinder portion 36.

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

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

[0033] Additionally, the positive busbar accommodating portion 42 has an elastically 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 elastically engaged portions 64, 64 is provided on both 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 elastically engaged portion 64 is provided so as to protrude rearward from the rear end portion of the left wall portion 56, and the right elastically engaged portion 64 is provided so as to protrude rearward from the right end portion of the upper wall portion 52, in a portion of the upper wall portion 52 rearward of a flange plate portion 76 (described later).

[0034] Each of these elastic engaged parts 64 is elastically deformable in the thickness direction, the left elastic engaged part 64 is elastically deformable in the left-right direction, and the right elastic engaged part 64 is elastically deformable in the up-down direction. An engaging claw 66 that protrudes inward (rightward) in the left-right direction is provided at the protruding end (rear end) of the left elastic engaged part 64, and an engaging claw 66 that protrudes inward (downward) in the up-down direction is provided at the protruding end (rear end) of the right elastic engaged part 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-rear direction, and the rear end surfaces of the engaging claws 66, 66 are inclined surfaces whose protruding dimension gradually increases to the right or downward as they proceed forward.

[0035] When the positive busbar 12 is inserted into the positive busbar accommodating section 42, which will be described later, each of these elastically engaged portions 64 is deformed by bending (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 section 42. When each of these elastically deformed elastically engaged portions 64 is elastically restored, an engaging claw 66 of each of the elastically engaged portions 64 is engaged with an engaging portion (positive engaging portion 24) provided on the positive busbar 12, thereby preventing the positive busbar 12 from being displaced in the axial direction. In the first embodiment, the engaging claw 66 of the left elastically engaged portion 64 is adapted to be engaged with a left end of a bent portion 22 that is bent 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 busbar accommodating portion 44) provided on the other side of the insulating partition wall 40 includes the insulating partition wall 40 protruding from the magnetic body accommodating cylindrical portion 36 (inner hole forming cylindrical portion 50) toward one axial end (rear end) and a negative 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 is configured by extending rearward continuously from the lower portions of the left wall portion 56 and the right wall portion 58 constituting the inner hole forming cylindrical portion 50. That is, the negative support accommodating portion 68 has a rectangular cross section of the same size as the negative busbar accommodating portion 44 in the inner hole 38, but the lower portion is not covered by the lower wall portion 54 and is open downward.

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

[0038] When the negative busbar 14 is inserted into the negative busbar accommodating portion 44, which will be described later, each of these elastic engaged portions 70 is deflected and deformed (elastically deformed in the first embodiment), thereby allowing the negative busbar 14 to be inserted from the other axial end side (front end side) to one axial end side (rear end side) 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 displacement of the negative busbar 14 in the axial direction.

[0039] In addition, a flange plate portion 76 that protrudes to the outer periphery and spreads in a substantially annular shape is formed on one axial end side (rear end side) of the outer periphery surface 74 (i.e., the outer surfaces of each of the wall portions 52, 54, 56, 58) of the inner hole forming cylindrical portion 50. In the first embodiment, the flange plate portion 76 has a predetermined protruding dimension toward the outer periphery and is formed continuously over substantially the entire circumference in the circumferential direction. The protruding dimension toward the outer periphery of the flange plate portion 76 is not limited, but is, for example, substantially equal to the radial width dimension of the ferrite core 16. As a result, when the ferrite core 16 is inserted into the inner hole forming cylindrical portion 50 as described later and the rear end surface 30 of the ferrite core 16 comes into contact with the flange plate portion 76, the outer periphery surface 34 of the ferrite core 16 and the protruding end surface of the flange plate portion 76 are located on the same curved surface that is substantially oval in shape, as shown in FIG. 4 and FIG. 7.

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

[0041] Furthermore, an elastic locking portion 80 capable of bending and deforming (elastically deforming in the first embodiment) inward in the first orthogonal direction (vertical direction) is provided on the other axial end side (front end side) of the outer peripheral surface 74 of the inner hole forming tube portion 50. In the first embodiment, a pair of slits 82, 82 are provided at a distance from each other in the left-right direction in the center part of the front end portion of the upper wall portion 52, and each slit 82 extends rearward with a predetermined length dimension (front-rear dimension). Between the left-right directions of each of these slits 82, an elastic locking portion 80 capable of elastically deforming in the vertical direction is formed, that is, the elastic locking portion 80 is provided at the center part of the front end portion of the upper wall portion 52 in the left-right direction, protruding forward.

[0042] The protruding tip (front end) of the elastic locking portion 80 is formed with a locking claw 83 that protrudes upward. The rear end surface of the locking claw 83 is a flat surface 84 that spreads in a direction perpendicular to the front-rear direction, and the front end surface of the locking claw 83 is an inclined surface 85 whose upward protruding dimension gradually increases toward the rear. That is, the flat surface 84 of the locking claw 83 and the upper part of the flange plate portion 76 face each other at a predetermined distance in the front-rear direction. A front-rear facing 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-rear dimension of the ferrite core 16. A front-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-rear dimension of the cover tube portion 48.

[0043] <Cover tube part 48> The cover tube portion 48 is a member formed separately from the magnetic body fixing jig 46, and is adapted to cover the outer peripheral surface 34 and the end surface (front end surface 32) on the other axial end side of the ferrite core 16 that is fitted onto the inner hole forming tube portion 50. That is, the cover tube portion 48 has a generally elongated cylindrical shape extending in the front-rear direction as a whole, and 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) at the front end portion of the peripheral wall portion 86. The inner diameter dimension of the inner peripheral surface 89 of the peripheral wall portion 86 is slightly larger than the outer diameter dimension of the ferrite core 16 and the protruding dimension of the flange plate portion 76 toward the outer periphery side. In addition, a central hole 90 through which the inner hole forming tube portion 50 of the magnetic body fixing jig 46 is inserted is formed penetrating the central portion of the front wall portion 88 in the thickness direction (front-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 peripheral side 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 at 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 peripheral side. 4, in the first embodiment, an inner circumferential surface 89 at one axial end (rear end) of the tubular cover portion 48 and a 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 therebetween. 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 a double-tube shape extending in the front-rear direction as a whole, and the region between the cover tube portion 48, which is an outer circumferential tube, and the inner hole forming tube portion 50 (magnetic body fixing jig 46), which is an inner circumferential tube, is the annular magnetic body accommodating tube portion 36, and the ferrite core 16 is accommodated in this magnetic body accommodating tube portion 36. The inner hole 38 of the magnetic body accommodating tube portion 36 is formed by a hole portion that passes through the inner hole forming tube portion 50, which is the inner circumferential tube, in the axial direction, and an insulating partition wall 40 is disposed in the inner hole 38 to form the positive and negative busbar accommodating portions 42, 44. Therefore, the inner circumferential surface of the ferrite core 16 is covered by the inner hole 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 dimension of the front wall portion 88 protruding toward the inner periphery is not limited, but is, for example, 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 plane that is approximately rectangular, as shown in FIG.

[0047] In the first embodiment, the inner circumferential surface 89 of the peripheral wall portion 86 of the cover tube portion 48 is provided with a contact rib 92 that protrudes inward and extends in the front-rear direction from the front end with a predetermined front-rear dimension. In particular, in the first embodiment, a plurality of contact ribs 92 are provided on the inner circumferential surface 89 of the peripheral wall portion 86, and the contact ribs 92 are arranged spaced apart from each other in the circumferential direction. As a result, when the cover tube portion 48 is fitted onto the ferrite core 16, the protruding tip (inner circumferential end) of each contact rib 92 comes into contact with the outer circumferential surface 34 of the ferrite core 16. That is, when the cover tube portion 48 is fitted onto the ferrite core 16 and assembled to the magnetic material fixing jig 46, the cover tube portion 48 is displaceable in the axial direction (front-rear direction) with respect to the magnetic material fixing jig 46 while the protruding tip (inner circumferential end) of each contact rib 92 is in sliding contact with the outer circumferential surface 34 of the ferrite core 16. This can suppress rattling of the cover tubular portion 48 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. For example, when the magnetic busbar assembly 10 is mounted on a vehicle (not shown), each abutment rib 94 may be brought into contact with a member to be mounted.

[0049] <Method of Assembling Busbar Assembly 10 With Magnetic Material> The following describes a specific example of a method for assembling the busbar assembly with magnetic bodies 10. Note that the method for manufacturing the busbar assembly with magnetic bodies 10 is not limited to the embodiment described below.

[0050] First, the ferrite core 16 is brought close to the magnetic body fixing jig 46 shown in FIG. 6 from the rear, and the front part of the magnetic body fixing jig 46 is inserted into the internal space 27 of the ferrite core 16. When the upper part of the inner peripheral edge of the ferrite core 16 comes into contact with the inclined surface 85 of the locking claw 83 of the elastic locking part 80 protruding forward from the inner hole forming tube part 50, the elastic locking part 80 is elastically deformed downward, and further insertion of the magnetic body fixing jig 46 is permitted. When the locking claw 83 of the elastic locking part 80 passes through the internal space 27 of the ferrite core 16, the elastic locking part 80 is elastically deformed to return to its initial shape. The insertion of the magnetic body fixing jig 46 into the internal space 27 of the ferrite core 16, i.e., the rearward displacement of the ferrite core 16 relative to the magnetic body fixing jig 46, is restricted by the abutment of the rear end surface 30 of the ferrite core 16 with the flange plate part 76. 7, in a state in which the rear end face 30 of the ferrite core 16 abuts against the flange plate portion 76 (a state in which 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 face 32 of the ferrite core 16 abuts against the flat surface 84 of the locking claw 83, thereby preventing the ferrite core 16 from falling off from the magnetic material fixing jig 46.

[0051] 7 (the ferrite core 16 is at the assembly end position E), the cover tube portion 48 is brought closer from 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 lock portion 80, so that the elastic lock portion 80 is elastically deformed downward, and further insertion of the magnetic body fixing jig 46 is permitted. When the locking claw 83 of the elastic lock portion 80 passes through the central hole 90, the elastic lock portion 80 is elastically deformed to return to its initial shape. The insertion of the magnetic body fixing jig 46 into the central hole 90, i.e., the rearward displacement of the cover tube portion 48 relative to the magnetic body fixing jig 46, is restricted, for example, by the front wall portion 88 of the cover tube portion 48 coming into contact with the front end surface 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 tube portion 48 is completed, the outer peripheral surface 34 and the front end surface 32 of the ferrite core 16 are covered by the cover tube 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 tube 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. In addition, in this state, the front wall portion 88 of the cover tube portion 48 abuts against the flat surface 84 of the locking claw 83, thereby preventing the cover tube portion 48 from falling off from the magnetic body fixing jig 46. That is, the elastic lock portion 80 elastically returns to its initial shape, so that the ferrite core 16 and the cover tube portion 48 are positioned and held in the axial direction between the locking claw 83 of the elastic lock portion 80 and the flange plate portion 76. In this manner, the cover cylinder portion 48 is assembled to the magnetic material fixing jig 46, whereby the insulating holding member 18 is formed.

[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 overlapped from above with the rear portion of the insulating partition wall 40 shown in FIG. 8, and the positive busbar 12 is slid forward. The positive busbar 12 pushed forward causes the left and right elastic engaged portions 64, 64 provided at the rear end of the positive busbar accommodating portion 42 to elastically deform 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, each 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, as shown in FIG. 1, the negative busbar 14 is inserted from the front into the negative busbar housing 44 of the insulating holding member 18. That is, the negative busbar 14 is overlapped with the front part of the insulating partition wall 40 from below, and the negative busbar 14 is slid backward. The negative busbar 14 pushed backward causes the left and right elastically engaged parts 70, 70 provided at the front end of the negative busbar housing 44 to elastically deform outward in the left and right direction, respectively, allowing further insertion of the negative busbar 14. Then, while the rear part of the negative busbar 14 is supported by the negative support housing 68, when each elastically engaged part 70 reaches each negative engagement part 26, each elastically engaged part 70 elastically returns to its original position and engages with each negative engagement part 26. This prevents the negative busbar 14 from being displaced in the axial direction relative to the insulating holding member 18. As a result, the magnetic body-equipped bus bar assembly 10 according to the first embodiment is completed.

[0055] In the busbar assembly 10 with magnetic bodies manufactured in this manner, for example, one end (e.g., rear end) in the length direction (front-rear direction) of the positive and negative busbars 12, 14 is electrically connected to a motor (not shown), and the other end (e.g., front end) in the length direction is electrically connected to a PCU (not shown). The busbar assembly 10 with magnetic bodies is fixed to an electric connection box or the like mounted on a vehicle. The above-mentioned electrical connection and fixing to the vehicle are realized, 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 a plurality of on-vehicle components (e.g., between a motor and a PCU) connected by the busbar assembly 10 with magnetic bodies.

[0056] According to the magnetic body-equipped busbar assembly 10 of embodiment 1, 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 vehicle-mounted components.

[0057] In particular, each of the busbar accommodating portions 42, 44 has a horizontally elongated shape with a width dimension larger than a height dimension, and these horizontally elongated busbar accommodating portions 42, 44 are stacked in a first orthogonal direction (vertical direction) that is the height direction. This makes it possible to reduce the space required to configure each of the busbar accommodating portions 42, 44, particularly in the width direction (horizontal direction). As a result, the ferrite cores 16 that are extrapolated to each of the busbars 12, 14, and ultimately the magnetic body-equipped busbar assembly 10, can be made smaller.

[0058] The magnetic body fixing jig 46 includes an inner hole forming cylinder portion 50 in which the bus bar accommodating portions 42, 44 are formed, a flange plate portion 76, and an elastic lock portion 80. When the ferrite core 16 is inserted into the inner hole forming cylinder portion 50, the ferrite core 16 is inserted from the front side of the magnetic body fixing jig 46, whereby the elastic lock portion 80 is elastically deformed downward, and the elastic lock portion 80 passes through the internal space of the ferrite core 16, whereby the elastic lock portion 80 elastically returns to its original position, and the ferrite core 16 is locked by the locking claw 83. The ferrite core 16 reaches the assembly end position E by abutting against the flange plate portion 76. The ferrite core 16 located at the assembly end position E is covered by the cover cylinder portion 48. The cover cylinder portion 48 is inserted into the ferrite core 16 by utilizing the elastic lock portion 80, as in the case of the ferrite core 16. In this manner, by utilizing 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 cover tubular portion 48 is fitted onto the ferrite core 16, an inner peripheral surface 89 at the rear opening of the cover tubular portion 48 covers the protruding end face of the flange plate portion 76 from the outer periphery, and in the first embodiment, the inner peripheral surface 89 at the rear opening of the cover tubular portion 48 and the protruding end face of the flange plate portion 76 are close to each other. This makes it possible to ensure a relatively large creepage distance between the ferrite core 16 arranged inside the cover tubular portion 48 and a bus bar (e.g., the positive electrode side bus bar 12) arranged outside the cover tubular portion 48, and therefore ensures insulation between the ferrite core 16 and the positive electrode side bus bar 12. As a result, it is not necessary to increase the separation distance between the ferrite core 16 and the positive electrode side 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 each elastic engaged portion 64 that prevents the positive busbar 12 from being displaced in the axial direction (front-rear direction). 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 each elastic engaged portion 70 that prevents the negative busbar 14 from being displaced in the axial direction (front-rear direction). 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 as a specific example of the present disclosure, the present disclosure is not limited to this specific description. Modifications, improvements, etc. within the scope of achieving the object of the present disclosure are included in the present disclosure. For example, the following modified examples 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 exemplified as an annular magnetic body to be extrapolated to each busbar 12, 14, but the present invention is not limited thereto, and any known annular magnetic body, such as one made of a nanocrystalline soft magnetic material, may be used as the annular magnetic body. Note that the magnetic body does not need to be strictly annular, and may be annular as a whole. The annular magnetic body may have an approximately C-shaped cross section with a slit provided on a part of the circumference, or may be configured to be annular as a whole by overlapping a pair of magnetic bodies each having a half-cylindrical shape.

[0063] (2) In the above embodiment, the busbar accommodating portions 42, 44 are stacked in the first orthogonal direction (vertical direction), but the pair of busbar accommodating portions may be stacked in the second orthogonal direction (horizontal direction). As in the above embodiment, the busbar accommodating portions 42, 44 are stacked in the vertical direction to reduce the size of the magnetic body-equipped busbar assembly 10 in the horizontal direction, but the busbar accommodating portions are stacked in the horizontal direction to reduce 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 restricted by, for example, the front wall portion 88 of the tubular cover portion 48 abutting against the front end face 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, but this is not limited to the above embodiment. For example, the outer periphery protruding dimension of the flange plate portion may be made larger than in the above embodiment, and the rearward displacement of the tubular cover portion may be restricted by the abutment of the rear end face of the tubular cover portion and the flange plate portion.

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

[0066] 10 Busbar assembly with magnetic material 12 Positive bus bar (bus bar) 14 Negative bus bar (bus bar) 16 Ferrite core (magnetic material) 18 Insulating retaining material 20 Bolt insertion hole 22 Bent part 24 Positive electrode side engagement portion (engagement portion) 26 Negative electrode side engagement portion (engagement portion) 27 Interior Space 28 Peripheral wall 30 Rear end face (end face on one end in the axial direction) 32 Front end face (end face on the other end in the axial direction) 34 Outer surface 36 Magnetic material housing cylinder 38 Inner Hole 40 Insulating bulkhead 42 Positive electrode bus bar accommodating portion (bus bar accommodating portion provided on one side of the insulating partition wall) 44 Negative bus bar accommodating portion (bus bar accommodating portion provided on the other side of the insulating partition wall) 46 Magnetic Fixture 48 Cover cylinder 50 Inner hole forming cylinder part 52 Upper wall 54 Lower wall part 56 Left wall 58 Right wall 60 Side wall 62 Positive electrode side support housing portion (support housing portion) 64 Elastic engaged part 66 Engagement Claw 68 Negative electrode side support housing portion (support housing portion) 70 Elastic engaged part 72 Engagement Claw 74 Outer surface 76 Flange plate 78 Through hole 80 Elastic lock part 82 Slit 83 Locking claw 84 Flat surface 85 Slope 86 Peripheral wall section 88 Front wall 89 Inner surface 90 Central hole 92,94 Contact rib E Assembly end position

Claims

1. A pair of bus bars; an annular magnetic body that is fitted around the pair of bus bars; an insulating holding member that holds the pair of bus bars and the magnetic body in a non-contact state with each other, The insulating holding member has an annular magnetic body accommodating cylindrical portion in which the magnetic body is accommodated, and a pair of bus bar accommodating portions in which the pair of bus bars are respectively accommodated, the pair of bus bars being disposed across an insulating partition wall that extends in the axial direction while penetrating an inner hole of the magnetic body accommodating cylindrical portion. A busbar assembly with magnetic material.

2. 2. The busbar assembly with magnetic material according to claim 1, wherein the pair of busbar accommodating portions are stacked in a first orthogonal direction perpendicular to the axial direction of the magnetic material accommodating cylinder portion across 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 larger than a plate thickness dimension of each of the busbars, and a width dimension in a second orthogonal direction that is larger than a plate width dimension of each of the busbars and larger than the height dimension.

3. The magnetic body accommodating cylindrical portion of the insulating holding member includes an inner hole forming cylindrical portion that configures 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 protruding outward from an outer circumferential surface of one axial end of the inner hole forming cylindrical portion; an elastic lock portion formed on the outer peripheral surface of the inner hole forming cylindrical portion at the other axial end side and capable of being flexibly deformed inward in the first orthogonal direction; a cover tube portion that covers an outer peripheral surface of the magnetic body having a rectangular frame shape that is fitted onto the inner hole forming tube portion and an end surface on the other axial end side, the cover tubular portion fitted onto 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 thereof by means of deflection deformation of the elastic locking 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. The bus bar assembly with magnetic body according to claim 3 , wherein an inner circumferential surface of the axial end of the cylindrical cover portion covers an outer circumferential surface of the protruding end face of the flange plate portion.

5. 3. The busbar assembly with magnetic body according to claim 1, wherein the busbar accommodating portion provided on one side of the insulating partition wall has a support accommodating portion configured to include the insulating partition protruding toward the other axial end side of the magnetic body accommodating cylindrical portion and a pair of side wall portions protruding from both side edges of the insulating partition wall, and an elastic engaged portion that protrudes toward the one axial end side of the magnetic body accommodating cylindrical portion and flexes and deforms 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 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.

6. 3. The busbar assembly with magnetic body according to claim 1, wherein the busbar accommodating portion provided on the other side of the insulating partition wall has a support accommodating portion configured to include the insulating partition protruding toward the one axial end side of the magnetic body accommodating cylindrical portion and a pair of side wall portions protruding from both side edges of the insulating partition wall, and an elastic engaged portion that protrudes toward the other axial end side of the magnetic body accommodating cylindrical portion and flexes and deforms 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 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.

Images