Busbar unit

Abstract

To provide a busbar unit capable of suppressing the occurrence of an undesigned gap between a pair of cores. [Solution] The busbar unit (10A) includes a busbar (3), a first core (1) and a second core (2) arranged on the outer periphery of the busbar (3), an elastic body (6) in contact with the second core (2), a base (4), a pressing member (5) that positions the first core (1), the second core (2), and the elastic body (6) between the base (4), and a bolt (7) that fixes the pressing member (5) to the base (4). The pressing member (5) has a plate-shaped pressing portion (50), and a plate portion (52) and a second plate portion (53) that are connected to both ends of the pressing portion (50) and extend parallel to each other. The elastic body (6) is pressed toward the base (4) by the pressing portion (50), and thus expands in the thickness direction, pressing the second core (2) toward the first core (1).

Description

[Technical Field]

[0001] The present invention relates to a bus bar unit including a bus bar and a core arranged on the outer periphery of the bus bar. [Background technology]

[0002] A bus bar unit in which a magnetic core for reducing noise is attached to a bus bar is known.

[0003] The bus bar unit disclosed in Patent Document 1 has a pair of U-shaped ferrite cores arranged annularly around the outer periphery of a bus bar, and these cores are covered and fixed by a leaf spring. The leaf spring has multiple engaging protrusions that engage with multiple through holes formed in the bus bar, thereby fixing the leaf spring to the bus bar. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3679723 Summary of the Invention [Problem to be solved by the invention]

[0005] The bus bar unit of Patent Document 1 does not have a mechanism to absorb dimensional tolerances that occur in the bus bar, core, and leaf spring, so there is a problem that an undesigned gap may occur between the pair of cores, which may affect noise removal performance.

[0006] Therefore, an object of the present invention is to provide a busbar unit that can prevent an undesigned gap from occurring between a pair of cores. [Means for solving the problem]

[0007] The present invention provides a busbar unit comprising: a busbar that is a strip-shaped conductor; first and second cores made of a magnetic material and arranged on the outer periphery of the busbar; an elastic body in contact with the second core; a base in contact with the first core, the second core, and the elastic body; a pressing member that positions the first core, the second core, and the elastic body between the base and the elastic body; and fixing means that fixes the pressing member to the base, wherein the pressing member has a pressing portion that contacts the first core, the second core, and the elastic body and presses the elastic body toward the base, and a plate portion that contacts the first core and positions the first core and the second core between the elastic body and the pressing portion, and the elastic body is pressed toward the base by the pressing portion, thereby pressing the second core toward the first core. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a busbar unit that can suppress the occurrence of an undesigned gap between a pair of cores. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a bus bar unit according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an exploded view of the bus bar unit of FIG. [Figure 3] 2A to 2C are diagrams illustrating a method of assembling the bus bar unit of FIG. 1. [Figure 4] 4 is a diagram showing a state in which the pressing member of FIG. 3 is fixed to a base. FIG. [Figure 5] 10A to 10C are diagrams illustrating a method of assembling a bus bar unit according to a second embodiment of the present invention. [Figure 6] 6 is a diagram showing a state in which the pressing member of FIG. 5 is fixed to a base. FIG. [Figure 7] 10A to 10C are diagrams illustrating a method of assembling a bus bar unit according to a third embodiment of the present invention. [Figure 8] 8 is a diagram showing a state in which the pressing member of FIG. 7 is fixed to the base. FIG. [Figure 9]10A to 10C are diagrams illustrating a method of assembling a bus bar unit according to a fourth embodiment of the present invention. [Figure 10] 10 is a diagram showing a state in which the pressing member of FIG. 9 is fixed to the base. FIG. [Figure 11] 10A to 10C are diagrams illustrating a method of assembling a bus bar unit according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] A bus bar unit according to a first embodiment of the present invention will be described with reference to FIGS.

[0011] The bus bar unit 10A of this example shown in FIG. 1 is built into a housing 9 of a device such as a power converter (for example, an on-vehicle inverter or a step-down converter), and is fixed to a substrate 8 placed on the housing 9.

[0012] The bus bar unit 10A includes a bus bar 3, a first core 1, a second core 2, an elastic body 6, a base 4, a pressing member 5, and two bolts (corresponding to fixing means) 7.

[0013] The busbar 3 is a wiring member through which a large current flows, and is obtained by punching out from a metal plate. In the illustrated example, only the portion of the busbar 3 where the first core 1 and the second core 2 are attached is shown, but the portion of the busbar 3 that is not shown is fixed to a substrate 8 or the like. The portion of the busbar 3 where the first core 1 and the second core 2 are attached is formed in a strip shape of equal width.

[0014] The first core 1 and the second core 2 are configured to attenuate high-frequency noise generated when the device is in operation and are made of a magnetic material such as ferrite. The first core 1 is formed in a U-shape with a rectangular parallelepiped base 11 and protrusions 12 and 13 protruding in the same direction from both longitudinal ends of the base 11. The second core 2 is formed in a rectangular parallelepiped shape of the same size as the base 11 of the first core 1, i.e., in an I-shape.

[0015] The first core 1 and the second core 2 are arranged in an annular shape on the outer periphery of the busbar 3 with a gap sheet (a plate with a thickness of about 0.1 mm, not shown) sandwiched between them, and with a pair of protrusions 12, 13 of the first core 1 in close proximity to the second core 2. As shown in FIG. 4 , the first core 1 and the second core 2 are arranged in an annular shape on the outer periphery of the busbar 3 without contacting the busbar 3.

[0016] The elastic body 6 is made of elastic rubber or an equivalent soft material with a low elastic modulus, and is formed in a rectangular parallelepiped shape. The elastic body 6 contacts the second core 2. As shown in FIG. 2, the elastic body 6 is formed with two bolt insertion holes 61 through which the bolts 7 are passed.

[0017] The base 4 has a plate portion 40 that contacts the first core 1, the second core 2, and the elastic body 6, and standing portions 42 that stand upright from both ends of the plate portion 40. As shown in Fig. 2, the plate portion 40 has two bolt insertion holes 41 formed therein, through which the bolts 7 are passed.

[0018] The pressing member 5 positions and fixes the first core 1, the second core 2, and the elastic body 6 between itself and the base 4. The pressing member 5 has a plate-shaped pressing portion 50 and a plate portion 52 and a second plate portion 53 that are connected to both ends of the pressing portion 50 and extend parallel to each other. The pressing portion 50 contacts the first core 1, the second core 2, and the elastic body 6 and presses the elastic body 6 toward the base 4. The plate portion 52 contacts the first core 1 and positions the first core 1 and the second core 2 between itself and the elastic body 6. The second plate portion 53 contacts the elastic body 6 and positions the first core 1, the second core 2, and the elastic body 6 between itself and the plate portion 52. As shown in FIG. 2 , the pressing portion 50 has two bolt insertion holes 51 through which bolts 7 are passed.

[0019] The bolts 7 fix the holding member 5 to the base 4. In this example, two bolt insertion holes through which the bolts 7 are passed are formed in the substrate 8. Furthermore, two bolt holes (internal threads) 91 into which the bolts 7 are screwed are formed in the housing 9. The two bolts 7 are passed through the bolt insertion holes 51 of the holding member 5, the bolt insertion holes 61 of the elastic body 6, the bolt insertion holes 41 of the base 4, and the bolt insertion holes of the substrate 8, respectively, and screwed into the bolt holes 91 of the housing 9. In this way, the holding member 5 is fixed to the base 4, and the base 4 is fixed to the substrate 8 and the housing 9.

[0020] As shown in Fig. 3, in the natural state before being pressed by the pressing member 5, the elastic body 6 is formed so that the dimension in the opposing direction between the pressing portion 50 and the base 4 (hereinafter referred to as the height dimension) is larger than the height dimensions of the first core 1 and the second core 2. When the elastic body 6 is pressed toward the base 4 by the pressing portion 50, the height dimension of the elastic body 6 becomes equal to those of the first core 1 and the second core 2, as shown in Fig. 4, and the elastic body 6 expands in the thickness direction to press the second core 2 toward the first core 1. That is, when the bolt 7 is tightened, the pressing portion 50 crushes the elastic body 6 toward the base 4, causing the elastic body 6 to expand in the thickness direction and press the second core 2 toward the first core 1.

[0021] As shown in Fig. 4, with the bolt 7 fixing the retaining member 5 to the base 4, the pressing portion 50 is in contact with the first core 1, the second core 2, and the elastic body 6, and the tip of the plate portion 52 and the tip (lower end) of the second plate portion 53 are spaced apart from the base 4. In other words, the height dimensions of the plate portion 52 and the second plate portion 53 are formed smaller than the height dimensions of the first core 1 and the second core 2. Note that although the illustration of the substrate 8 and the housing 9 is omitted in Fig. 4, the bolt 7 is passed through the bolt insertion hole of the substrate 8 and screwed into the bolt hole 91 of the housing 9 as described above.

[0022] In this way, the first core 1 and the second core 2 are fixed in the height direction by being sandwiched between the pressing portion 50 and the base 4. Furthermore, the first core 1 and the second core 2 are fixed in the arrangement direction (horizontal direction) by being sandwiched between the plate portion 52 and the elastic body 6. Furthermore, the first core 1 and the second core 2 are fixed in the depth direction of the paper surface of FIG. 4 by being sandwiched between the pair of upright portions 42 of the base 4.

[0023] In this busbar unit 10A, the elastic body 6 constantly presses the second core 2 toward the first core 1, so the gap between the first core 1 and the second core 2 is maintained at the thickness dimension of the gap sheet (approximately 0.1 mm). This stabilizes the noise removal performance of the first core 1 and the second core 2. That is, even if the first core 1, the second core 2, and the retaining member 5 have dimensional tolerances (dimensional tolerances in the arrangement direction of the first core 1 and the second core 2), the elastic body 6 elastically deforms and expands in the thickness direction, thereby filling the gap caused by the dimensional tolerances. This prevents an undesigned gap from occurring between the first core 1 and the second core 2. The gap between the first core 1 and the second core 2 caused by the gap sheet is a designed gap, not an undesigned gap.

[0024] Furthermore, in busbar unit 10A, bolts 7 pass through substrate 8 and screw into bolt holes 91 in housing 9, eliminating the need for a separate structure for fixing busbar unit 10A to substrate 8 or housing 9, thereby enabling the size of the device to be reduced. Also, because the above structure presses first core 1 and second core 2 against housing 9, heat generated in first core 1 and second core 2 is easily transferred to housing 9, thereby preventing the temperature rise of first core 1 and second core 2.

[0025] A bus bar unit according to a second embodiment of the present invention will be described with reference to Figures 5 and 6. In Figures 5 and 6, the same components as those in the above-described embodiment are designated by the same reference numerals, and description thereof will be omitted.

[0026] The bus bar unit 10B shown in FIGS. 5 and 6 includes a bus bar 3, a first core 1, a second core 2, an elastic body 6, a base 4, a pressing member 5B, and two bolts 7.

[0027] A protruding portion 54 is formed on the second plate portion 53 of the pressing member 5B, protruding toward the elastic body 6. The protruding portion 54 bites into the center of the elastic body 6 in the height direction.

[0028] In such a busbar unit 10B, a protrusion 54 is formed on the second plate portion 53, which prevents the elastic body 6 from slipping between the second core 2 and the pressing portion 50 when the pressing portion 50 presses the elastic body 6 toward the base 4, i.e., when the bolt 7 is tightened.

[0029] A bus bar unit according to a third embodiment of the present invention will be described with reference to Figures 7 and 8. In Figures 7 and 8, the same components as those in the above-described embodiment are designated by the same reference numerals, and description thereof will be omitted.

[0030] A bus bar unit 10C shown in FIGS. 7 and 8 includes a bus bar 3, a first core 1, a second core 2, an elastic body 6C, a base 4C, a pressing member 5C, and two bolts 7.

[0031] The elastic body 6C is formed so that the height dimension in the opposing direction between the pressing portion 50 and the base 4C is smaller than the height dimensions of the first core 1 and the second core 2 in a natural state before being pressed by the pressing member 5C.

[0032] The plate portion 40 of the base 4C has a portion 43 that contacts the elastic body 6C protruding toward the pressing member 5C further than the portions that contact the first core 1 and the second core 2. This prevents the elastic body 6C from slipping between the base 4C and the second plate portion 53 when the pressing portion 50 compresses the elastic body 6C toward the base 4C, i.e., when the bolt 7 is tightened.

[0033] The pressing portion 50 of the holding member 5C has a portion 55 that contacts the elastic body 6C protruding toward the base 4C further than the portions that contact the first core 1 and the second core 2. This prevents the elastic body 6C from slipping in between the second core 2 and the pressing portion 50 when the pressing portion 50 crushes the elastic body 6C toward the base 4C, i.e., when the bolt 7 is tightened.

[0034] A bus bar unit according to a fourth embodiment of the present invention will be described with reference to Figures 9 and 10. In Figures 9 and 10, the same components as those in the above-described embodiment are designated by the same reference numerals, and description thereof will be omitted.

[0035] A bus bar unit 10D shown in FIGS. 9 and 10 includes a bus bar 3, a first core 1, a second core 2, an elastic body 6, a base 4D, a pressing member 5D, and two bolts 7.

[0036] The base 4D has a plate portion 40D that contacts the first core 1, the second core 2, and the elastic body 6, and standing portions 42D that stand upright from both ends of the plate portion 40D.

[0037] The pressing member 5D has a pressing portion 50, and a plate portion 52D and a second plate portion 53D that are connected to both ends of the pressing portion 50 and extend parallel to each other.

[0038] The dimensions of the plate portion 40D and the standing portion 42D in the opposing direction of the plate portion 52D and the second plate portion 53D (the left-right direction in FIGS. 9 and 10, and the thickness direction of the busbar 3) are smaller than the distance between the plate portion 52D and the second plate portion 53D. Also, the height dimensions of the plate portion 52D and the second plate portion 53D are larger than the height dimensions of the first core 1 and the second core 2.

[0039] As shown in FIG. 10 , when the bolt 7 fixes the retainer member 5D to the base 4D, the pressing portion 50 contacts the first core 1, the second core 2, and the elastic body 6, and the leading end (lower end) of the plate portion 52D and the leading end (lower end) of the second plate portion 53D are positioned below the first core 1 and the second core 2. Note that although the board 8 and the housing 9 are not shown in FIG. 10 , the bolt 7 is passed through a bolt insertion hole in the board 8 and screwed into a bolt hole 91 in the housing 9, as in the first embodiment (see FIG. 1 for the board 8 and the housing 9). When the bolt 7 is screwed into the bolt hole 91, the leading end (lower end) of the plate portion 52D and the leading end (lower end) of the second plate portion 53D are spaced apart from the board 8. With the above configuration, the pressing portion 50 can contact the first core 1, the second core 2, and the elastic body 6.

[0040] A bus bar unit according to a fifth embodiment of the present invention will be described with reference to Fig. 11. In Fig. 11, the same components as those in the above-described embodiments are denoted by the same reference numerals, and description thereof will be omitted.

[0041] A bus bar unit 10E shown in FIG. 11 includes a bus bar 3, a first core 1, a second core 2, an elastic body 6, a base 4, a pressing member 5E, and two bolts 7.

[0042] The pressing member 5E has a pressing portion 50 and a plate portion 52 that is connected to one end of the pressing portion 50 and extends perpendicular to the pressing portion 50. As described above, the pressing member 5E of this example does not have the second plate portion 53 described in the first embodiment.

[0043] In such a busbar unit 10E, when the bolt 7 is tightened, the pressing portion 50 presses the elastic body 6 toward the base 4. When the elastic body 6 is pressed toward the base 4 by the pressing portion 50, the height dimension thereof becomes equal to the height dimensions of the first core 1 and the second core 2, and the elastic body 6 expands in the thickness direction to press the second core 2 toward the first core 1. Note that in this example, the force with which the elastic body 6 presses the second core 2 toward the first core 1 is smaller than when the second plate portion 53 is provided.

[0044] In the above-described embodiment, the bolt 7 is passed through the bolt insertion hole 61 formed in the elastic bodies 6, 6C, but in the present invention, the bolt does not necessarily have to pass through the elastic body. For example, an elastic body may be disposed between two bolts, or an elastic body may be disposed between the second core and the bolt. Furthermore, in the above-described embodiment, the bolt 7 is used as the fixing means, but in the present invention, a rivet other than the bolt 7 may also be used as the fixing means.

[0045] In the above-described embodiment, the busbar units 10A, 10B, 10C, 10D, and 10E have a U-shaped first core 1 and an I-shaped second core 2, but in the present invention, it is also possible to use a U-shaped first core and a U-shaped second core.

[0046] The above-described embodiment merely shows a typical form of the present invention, and the present invention is not limited to this embodiment. In other words, the present invention can be implemented with various modifications within the scope of the gist of the present invention. As long as such modifications still include the configuration of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0047] 1 First Core 2 Second Core 3 Bus Bar 4, 4C, 4D base 5, 5B, 5C, 5D, 5E Holding member 6,6C Elastic body 7 Bolts (fixing means) 10A, 10B, 10C, 10D, 10E Busbar unit

Claims

1. a bus bar that is a strip-shaped conductor; a first core and a second core, each made of a magnetic material and arranged on an outer periphery of the bus bar; an elastic body in contact with the second core; a base in contact with the first core, the second core, and the elastic body; a pressing member that positions the first core, the second core, and the elastic body between the pressing member and the base; a fixing means for fixing the pressing member to the base, The pressing member is a pressing portion that contacts the first core, the second core, and the elastic body and presses the elastic body toward the base; a plate portion that contacts the first core and positions the first core and the second core between the plate portion and the elastic body, The elastic body is pressed toward the base by the pressing portion, thereby pressing the second core toward the first core. A bus bar unit characterized by the above.

2. a bolt is provided as the fixing means, The pressing portion, the elastic body, and the base are formed with a bolt insertion hole through which the bolt is passed. The bus bar unit according to claim 1 .

3. The pressing member is a second plate portion that is in contact with the elastic body and that positions the first core, the second core, and the elastic body between the second plate portion and the plate portion; The bus bar unit according to claim 1 .

4. The second plate portion has a protruding portion that protrudes toward the elastic body. The bus bar unit according to claim 3 .

5. the elastic body, in a natural state before being pressed, has a dimension in a direction in which the pressing portion and the base face each other that is smaller than the dimensions of the first core and the second core in the same direction; The pressing portion has a portion that contacts the elastic body and protrudes toward the base further than a portion that contacts the first core and the second core. The bus bar unit according to claim 1 .

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