Bus bar unit

Abstract

To provide a bus bar unit capable of suppressing heat generation during energization as much as possible and having good assembling workability.SOLUTION: The bus bar unit 10 includes a bus bar 3, a first core 1, a second core 2, a pair of positioning components 5A and 5B, and a fixing cover 4. The bus bar 3 includes a band-shaped portion 31 and bus bar protrusions protruding from both ends of the band-shaped portion 31 in the width direction. The positioning components 5A and 5B sandwich the belt-like portion 31 from both sides in the width direction and position the first core 1 and the second core 2 so as to be annularly arranged on the outer periphery of the belt-like portion 31. Each of the positioning components 5A and 5B includes a main body portion 50 extending in the longitudinal direction of the band-shaped portion 31 and a pair of extension portions 57 extending from the outer surface of the main body portion 50 to the side opposite to the band-shaped portion 31. The main body portion 50 is formed with a groove 53 into which one side in the width direction of the band-shaped portion 31 is inserted, and an engaging recessed portion which is formed to be recessed from an inner surface of the groove 53 and with which the bus bar protrusion is engaged.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bus bar unit including a bus bar and a core annularly 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 annularly arranged on the outer periphery of a bus bar, and these cores are 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.

[0004] In the bus bar unit disclosed in Patent Document 2, a pair of U-shaped ferrite cores are annularly arranged on the outer periphery of the bus bar, and the cores are fixed integrally to the bus bar by filling the interior of the cores with resin. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3679723 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-30331 Summary of the Invention [Problem to be solved by the invention]

[0006] In the bus bar unit of Patent Document 1, a through hole is formed in the bus bar to fix the leaf spring, which causes a large current to avoid the through hole and flow through a portion with a small cross-sectional area, resulting in a problem of large heat generation at the engagement point between the leaf spring and the bus bar.

[0007] The bus bar unit of Patent Document 2 has problems in that it takes time to apply and dry the resin, and it is time-consuming to align the bus bar and the core.

[0008] Therefore, an object of the present invention is to provide a bus bar unit that can minimize heat generation when energized and that is easy to assemble. [Means for solving the problem]

[0009] The present invention provides a bus bar unit comprising: a bus bar that is a strip-shaped conductor; first and second cores that are magnetic bodies; and a pair of positioning components that sandwich the bus bar and position the first and second cores so that they are arranged in a ring shape around the outer periphery of the bus bar, wherein the bus bar has bus bar protrusions that protrude from both widthwise ends, and the pair of positioning components each have locking means for locking the bus bar to each other, an engaging recess that engages with the bus bar protrusions, and a positioning portion that positions the first and second cores in the longitudinal and widthwise directions of the bus bar. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a bus bar unit that can minimize heat generation when energized and that is easy to assemble. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view of a bus bar unit according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded view of the bus bar unit of FIG. [Figure 3] 3 is an enlarged view of the bus bar and a pair of positioning components in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0012] A bus bar unit according to one embodiment of the present invention will be described with reference to FIGS.

[0013] 1 and 2, a bus bar unit 10 of this example is built into a switching power supply device, etc. The bus bar unit 10 includes a bus bar 3, a first core 1, a second core 2, a pair of positioning components 5A and 5B, and a fixing cover 4.

[0014] 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 portions of the busbar 3 that are not shown are fixed to a housing, a substrate, etc. The portion of the busbar 3 where the first core 1 and the second core 2 are attached is formed with a strip-shaped portion 31 of equal width and busbar protrusions 32 that protrude from both ends of the strip-shaped portion 31 in the width direction.

[0015] 1 to 3, arrow Y corresponds to the longitudinal direction of the strip portion 31, arrow X corresponds to the width direction (short direction) of the strip portion 31, and arrow Z corresponds to the thickness direction of the strip portion 31.

[0016] The first core 1 and the second core 2 attenuate high-frequency noise generated during operation of the device 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 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. The first core 1 and the second core 2 are arranged in an annular shape on the outer periphery of the band-shaped portion 31, with the pair of protrusions 12 of the first core 1 abutting or adjacent to the second core 2.

[0017] The pair of positioning parts 5A, 5B are parts that sandwich the strip-shaped portion 31 from both sides in the width direction and position the first core 1 and the second core 2 so that they are arranged in a ring shape on the outer periphery of the strip-shaped portion 31. The pair of positioning parts 5A, 5B have the same configuration except for the locking means (claw portion 51, claw receiving portion 52) described below.

[0018] The pair of positioning components 5A, 5B are made of insulating synthetic resin. Each of the pair of positioning components 5A, 5B has a main body 50 extending in the longitudinal direction of the strip-shaped portion 31 and a pair of extension portions 57 extending from the outer surface of the main body 50 toward the opposite side of the strip-shaped portion 31. The positioning component 5B also has multiple claw portions 51 connected to the outer surface of the main body 50. The positioning component 5A has multiple claw receivers 52 connected to the outer surface of the main body 50. Each claw portion 51 engages with a corresponding claw receiver 52, thereby fixing the pair of positioning components 5A, 5B together with the strip-shaped portion 31 sandwiched therebetween.

[0019] The main body 50 is formed with a groove 53 into which one widthwise side of the strip-shaped portion 31 is inserted, and an engagement recess 54 recessed from the inner surface of the groove 53. As shown in FIG. 1 , the left half of the strip-shaped portion 31 is inserted into the groove 53 of the positioning component 5A, and the right half of the strip-shaped portion 31 is inserted into the groove 53 of the positioning component 5B. Then, the bus bar protrusions 32 engage with the engagement recesses 54, and the claws 51 engage with the claw receivers 52, thereby fixing the pair of positioning components 5A and 5B in predetermined positions on the strip-shaped portion 31.

[0020] A central portion 58 of the main body portion 50 in the longitudinal direction (arrow Y direction) is positioned between the pair of protrusions 12 of the first core 1. The second core 2 positions the central portion 58 of the main body portion 50 between itself and the first core 1. The central portion 58 of the main body portion 50 in the longitudinal direction is formed one step lower than both longitudinal end portions 59 of the main body portion 50. This step prevents the first core 1 and the second core 2 from misaligning in the bus bar longitudinal direction (arrow Y direction).

[0021] The engagement recess 54 is formed in the central portion 58 of the main body portion 50. Therefore, when the bus bar unit 10 is in a fully assembled state, the bus bar protrusions 32 and the engagement recess 54 are disposed in the hollow portions (between the pair of protrusions 12) inside the first core 1 and the second core 2.

[0022] The pair of extension portions 57 extend from both end portions 59 of the main body portion 50 in the direction opposite to the strip-shaped portion 31. The pair of extension portions 57 are formed in an L-shape having parallel portions 55 extending parallel to each other and pressing portions 56 extending from the tips of the parallel portions 55 in directions approaching each other. The pair of extension portions 57 is aligned with the corners of the first core 1 and the second core 2. This restricts misalignment of the first core 1 and the second core 2 in the bus bar longitudinal direction (arrow Y direction) and the bus bar width direction (arrow X direction).

[0023] As described above, the main body 50 and the pair of extension portions 57 of the pair of positioning parts 5A, 5B function as positioning portions that position the first core 1 and the second core 2 in the longitudinal and width directions of the strip portion 31.

[0024] The fixed cover 4 is used to fix the first core 1 and the second core 2 in the thickness direction (arrow Z direction) of the strip-shaped portion 31. The fixed cover 4 is made of insulating synthetic resin, and has a plate portion 41 that is placed on the first core 1, a plate portion 42 that is placed on the second core 2, and a connecting portion 43 that connects the plate portions 41 and 42 together. Instead of using the fixed cover 4, it is also possible to use tape.

[0025] The busbar unit 10 is assembled as follows: First, a pair of positioning components 5A, 5B are attached to the strip portion 31. Next, the first core 1 and the second core 2 are attached to the pair of positioning components 5A, 5B. Finally, the first core 1 and the second core 2 are sandwiched between the fixed cover 4, completing the assembly.

[0026] In the bus bar unit 10 described above, the pair of positioning components 5A, 5B can be attached to the bus bar 3 without forming through holes in the bus bar 3 (without reducing the cross-sectional area) as in the prior art (see Patent Document 1). This allows the first core 1 and the second core 2 to be attached while minimizing heat generation during current flow. Furthermore, since there are no through holes and the cross-sectional area of ​​the bus bar 3 is not reduced as described above, heat from the bus bar 3 is easily dispersed.

[0027] Furthermore, the bus bar unit 10 can be aligned with the bus bar 3 simply by assembling each component, resulting in excellent assembly workability. That is, the first core 1 and the second core 2 can be fixed without filling with resin as in the prior art (see Patent Document 2), eliminating the need for a resin filling device or drying time for the resin.

[0028] In the above-described embodiment, the busbar unit 10 includes 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.

[0029] In the above-described embodiment, the bus bar projections 32 and the engaging recesses 54 are disposed in the hollow portions inside the first core 1 and the second core 2. However, the present invention is not limited to this. That is, the bus bar projections 32 and the engaging recesses 54 may be disposed on the outer portions of the first core 1 and the second core 2, avoiding the hollow portions where heat is generated. In this case, the positioning components become slightly larger.

[0030] 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]

[0031] 1 First Core 2 Second Core 3 Bus Bar 4 Fixed cover 5A, 5B Positioning parts 10 Busbar unit 32 Busbar protrusion 50 Main body (positioning part) 51 Claw (locking means) 52 Claw receiving portion (locking means) 53 Groove 54 Engagement recess 57 Extension section (positioning section)

Claims

1. a bus bar that is a strip-shaped conductor; a first core and a second core that are magnetic materials; a pair of positioning components that sandwich the bus bar and position the first core and the second core so that they are arranged annularly on the outer periphery of the bus bar, The bus bar has bus bar protrusions protruding from both widthwise ends thereof, Each of the pair of positioning components has a locking means for locking the pair of positioning components to each other, an engaging recess for engaging with the bus bar protrusion, and a positioning portion for positioning the first core and the second core in the longitudinal direction and width direction of the bus bar. A bus bar unit characterized by the above.

2. The pair of positioning components each include: a main body portion extending in a longitudinal direction of the bus bar; the locking means connected to the outer surface of the main body; a groove formed in the main body portion into which one widthwise side of the bus bar is inserted; the engagement recess formed concavely from the inner surface of the groove in the main body; a pair of extension portions extending from an outer surface of the main body portion to a side opposite to the bus bar, The main body and the pair of extensions form the positioning portion. The bus bar unit according to claim 1 .

3. The bus bar protrusion and the engagement recess are disposed in hollow portions inside the first core and the second core. The bus bar unit according to claim 1 .

4. a fixing cover that fixes the first core and the second core in the thickness direction of the bus bar; The bus bar unit according to claim 1 .

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