JP-7854820-B2 - electronic equipment

JP7854820B2JP 7854820 B2JP7854820 B2JP 7854820B2JP-7854820-B2

Inventors

宮崎直樹
深町聡

Assignees

株式会社デンソーテン

Dates

Publication Date: 20260507
Application Date: 20220216

Claims (6)

The casing and A first member protruding from the hole in the housing, A second member is fitted into the hole of the housing and has an insertion opening into which the first member is inserted, Equipped with, The second member is, A covering portion that tightly covers the area around the tip of the hole, with a gap formed at the tip of the hole, It is connected to the covering portion and positioned in contact with the first member, and has a contact portion whose tip is tapered to follow the outer surface of the first member, The aforementioned covering portion is In cross-sectional view, it is U-shaped, and the tip on the external side of the housing is a protruding portion that extends toward the housing. electronic equipment.
The casing and A first member protruding from the hole in the housing, A second member is fitted into the hole of the housing and has an insertion opening into which the first member is inserted, Equipped with, The second member is, A covering portion that tightly covers the area around the tip of the hole, with a gap formed at the tip of the hole, It is connected to the covering portion and positioned in contact with the first member, and has a contact portion whose tip is tapered to follow the outer surface of the first member, The first member is, It is a bus bar, The second member is, It is a grommet. electronic equipment.
The aforementioned contact portion is, The electronic device according to claim 1 or 2 , having a shape that is flexible relative to the covering portion.
The second member is, The electronic device according to claim 3 , wherein the covering portion, the contact portion, and the connecting portion between the covering portion and the contact portion are curved in cross-sectional view.
The aforementioned connecting portion is Of the covering portion, the end portion located on the inside side of the housing is The aforementioned contact portion is, The electronic device according to claim 4 , wherein the curved shape extends from the end toward the outside of the housing.
A first circuit board is placed inside the housing and on which the busbar is mounted, A second substrate is positioned closer to the hole than the first substrate and has a through hole through which the busbar passes, The electronic device according to claim 2, comprising a current sensor having a core portion that covers the periphery of the busbar at a position closer to the hole than the second substrate, and a circuit portion connected to the core portion and mounted on the second substrate.

Description

This invention relates to electronic equipment. Conventionally, for example, in the case of electronic equipment mounted in vehicles, a structure is known in which a grommet is used to waterproof the space between a busbar, which carries a large current from a circuit board inside the enclosure to the outside of the enclosure, and the cover. Patent No. 4264905 Figure 1 is a diagram showing the mounting position of the electronic device according to the embodiment.Figure 2 is a perspective view showing the external appearance of the electronic device according to this embodiment.Figure 3 shows the electronic device viewed from above (positive Y-axis).Figure 4 is a cross-sectional view of an electronic device.Figure 5 is a cross-sectional view of the grommet. The embodiments of the electronic device disclosed herein will be described in detail below with reference to the attached drawings. However, the present invention is not limited to the embodiments described below. Figure 1 shows the mounting position of the electronic device according to the embodiment. As shown in Figure 1, the electronic device 1 according to the embodiment is mounted on the vehicle C. The electronic device 1 is, for example, an inverter that supplies power to a drive motor mounted on the vehicle C, and is positioned, for example, on the outside bottom of the vehicle C. In other words, the electronic device 1 is positioned in an exposed state outside the vehicle C. In Figure 1 and subsequent figures, a three-axis orthogonal coordinate system is shown. Specifically, the X-axis corresponds to the direction of travel (forward/backward direction) of vehicle C, with the positive side defined as forward and the negative side as backward. The Y-axis corresponds to the height direction of vehicle C, with the positive side defined as the higher side and the negative side as the lower side. The Z-axis corresponds to the width direction of vehicle C, with the positive side defined as the rightward direction of the vehicle and the negative side as the leftward direction of the vehicle. Note that in Figure 2 and subsequent figures, the Z-axis may not be shown; in such cases, it means that the positive and negative directions of the Z-axis are irrelevant. Next, the external configuration of the electronic device 1 according to this embodiment will be described using Figures 2 and 3. Figure 2 is a perspective view showing the external appearance of the electronic device 1 according to this embodiment. Figure 3 is a view of the electronic device 1 from above (positive Y-axis side). As shown in Figure 2, the electronic device 1 according to this embodiment has a substantially rectangular parallelepiped shape. As shown in Figure 2, the electronic device 1 comprises a housing 2, a lid 3, a busbar 4, a grommet 5, and a heat dissipation fin 6. Other components, such as the internal structure of the electronic device 1, will be described later. The housing 2 houses various components, such as electronic components, related to the electronic device 1. The internal structure of the housing 2 will be described later in Figure 4. The housing 2 has an opening on its upper side (positive Y-axis side), which is covered by the lid 3. Furthermore, the housing 2 has multiple heat dissipation fins 6 on its lower side (negative Y-axis side) that function as a heat sink. The heat dissipation fins 6 are heat dissipation members that protrude from the external surface 21 of the housing 2 (see Figure 4), and they dissipate heat generated by the electronic components built into the housing 2 to the outside. The lid 3 functions as a cover that seals the opening of the housing 2. By sealing the opening of the housing 2, the lid 3 prevents foreign matter (such as moisture, dust, or dirt) from entering the inside of the housing 2. In this disclosure, the housing 2 and the lid 3 may be collectively referred to as the housing 2. The busbar 4 (an example of the first component) is a conductive member that carries current generated by the electronic device 1 to the drive motor mounted on the vehicle C. It is assembled so that the current passes from inside the housing 2 through a hole provided in the lid 3 (housing 2) and protrudes outwards from the hole. The busbar 4 is mounted on a circuit board 7 (see Figure 4) inside the housing 2. In this disclosure, an example is shown in Figure 2 where multiple (five) busbars 4 are arranged. The grommet 5 (an example of the second component) is interposed between the housing 2 (lid 3) and the busbar 4, electrically insulating the busbar 4 from the housing 2 and preventing foreign matter (moisture, dust, dirt, etc.) from entering the housing 2. Specifically, as shown in Figure 3, the grommet 5 is fitted into a hole in the housing 2 (lid 3) and has an insertion opening 50 into which the busbar 4 is inserted. The grommet 5 is an elastic component made of, for example, a resin material. Next, the internal structure of the electronic device 1 wi