Vehicle-mounted electrical unit

Abstract

The present invention provides an in-vehicle electrical unit that can suppress the reduction in axial force of bolt fastening between the housing and the service hole cover. [Solution] The on-board electrical unit 1 is an electrical unit mounted in a vehicle, comprising a housing 2 and a service hole cover 3 fastened to the housing 2 with bolts. The adhesive fastening seat surface 321 of the service hole cover 3 has an adhesive surface 321A that adheres the housing 2 and the service hole cover 3, a protruding portion 321B that protrudes from the adhesive surface 321A toward the fastening seat surface 22 of the housing 2, and double-sided tape 322 provided between the housing 2 and the adhesive surface 321A.

Description

Technical Field

[0001] This disclosure relates to an in-vehicle electric unit.

Background Art

[0002] In an electric unit mounted on a vehicle, when a high-output current flows, a copper bus bar may be directly bolted. In this case, after the bolt fastening, a service hole cover is attached to the opening provided for the fastening, and the opening is closed (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the unlikely event that an operator does not follow the work procedure, removes the service hole cover, and touches the copper bus bar, there is a risk of electric shock.

[0005] As a countermeasure, it is conceivable to adopt an adhesive structure between the service hole cover and the housing provided with the opening. With this configuration, it is possible to prevent electric shock by creating a mechanism in which the service hole cover does not come off the housing unless the adhesive part is damaged. For example, such an adhesive structure can be realized by providing an adhesive member such as double-sided tape on the fastening seat surface for bolt-fastening the service hole cover to the housing.

[0006] However, if the double-sided tape is simply pasted on the seat surface, there is a concern about a decrease in the bolt axial force because the double-sided tape sags due to vehicle vibration or heat.

[0007] The purpose of this disclosure is to provide an in-vehicle electrical unit that can suppress the reduction in axial force of bolt fastening between the housing and the service hole cover. [Means for solving the problem]

[0008] An in-vehicle electrical unit according to one aspect of an embodiment of the present invention is an electrical unit mounted in a vehicle, comprising a housing and a service hole cover fastened to the housing with bolts, wherein the fastening seat surface of the service hole cover has an adhesive surface that adheres the housing and the service hole cover together, a protruding portion that extends beyond the adhesive surface toward the fastening seat surface of the housing, and an adhesive member provided between the housing and the adhesive surface. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide an in-vehicle electrical unit that can suppress the reduction in axial force of bolt fastening between the housing and the service hole cover. [Brief explanation of the drawing]

[0010] [Figure 1] Schematic diagram showing the adhesive structure between the service hole cover and the housing in the reference configuration. [Figure 2] A schematic diagram showing the adhesive structure between the service hole cover and the housing according to the embodiment. [Figure 3] A perspective view showing a first example of the adhesive structure of a service hole cover according to the embodiment. [Figure 4] A perspective view showing a second example of the adhesive structure for the service hole cover according to the embodiment. [Figure 5] A perspective view showing a third example of the adhesive structure of a service hole cover according to the embodiment. [Modes for carrying out the invention]

[0011] The embodiments will be described below with reference to the attached drawings. To facilitate understanding of the explanation, the same reference numerals are used for identical components in each drawing whenever possible, and redundant explanations are omitted.

[0012] Figure 1 is a schematic diagram showing an example of the adhesive structure between the service hole cover 3 and the housing 2 according to the reference embodiment. As shown in Figure 1, the in-vehicle electrical unit 1 according to the reference embodiment comprises a housing 2 and a service hole cover 3. In Figure 1, the lower part of the figure is the interior of the housing 2, and live parts 5, including busbars, are housed inside the housing 2. Figure 1 also shows the housing 2 and the service hole cover 3 in a cross-sectional view.

[0013] The housing 2 is provided with an opening 21 located in the horizontal center of the figure, opening upwards in the figure. The opening 21 is positioned opposite a part of the live electrical section 5, allowing workers to perform tasks such as bolting the busbars of the live electrical section 5 through the opening 21.

[0014] In Figure 1, the service hole cover 3 is positioned on the upper side of the housing 2, and the figure shows the service hole cover 3 attached to the housing 2, closing the opening 21. The service hole cover 3 has, for example, an insertion portion 31 that protrudes downward in the figure, and the opening 21 can be closed by inserting the insertion portion into the opening 21 of the housing 2. In other words, in the example of Figure 1, the downward direction is the assembly direction for attaching the service hole cover 3 to the housing 2, and the upward direction is the removal direction for removing the service hole cover 3 from the housing 2.

[0015] Preferably, the inner circumferential surface of the opening 21 and the outer circumferential surface of the insertion portion 31 have the same cross-sectional shape, such as an oval, ellipse, or circle, in the direction perpendicular to the assembly or removal direction, and are formed so that a certain gap is created between the inner and outer circumferential surfaces. In this case, an annular gasket 4 is installed on the outer circumferential surface of the insertion portion 31 of the service hole cover 3 along the circumferential direction. The gasket 4 is formed so as to be able to seal the gap between the inner circumferential surface of the opening 21 and the outer circumferential surface of the insertion portion 31 when assembled.

[0016] Further, around the opening 21 of the housing 2 (the left and right sides of the opening 21 in FIG. 1), a connecting portion 23 is provided so as to protrude to substantially the same position as the end face of the opening 21. A seating surface 22 is provided on the end face of the connecting portion 23, and bolt fastening holes are provided in the assembling direction from the seating surface 22. Female threads are formed on the inner peripheral surface of the bolt fastening holes, and bolts can be screwed therein.

[0017] On the other hand, on the service hole cover 3, a fastening seating surface 32 is provided at a position facing the seating surface 22 of the housing 2 when the insertion portion 31 is attached to the opening 21 of the housing 2. A bolt insertion hole is provided on the fastening seating surface 32 so as to be coaxially arranged with the bolt fastening hole of the housing 2. By inserting the shaft portion of the bolt through the bolt insertion hole of the service hole cover 3 from above in the drawing and screwing it into the bolt fastening hole of the housing 2, the service hole cover 3 can be bolt-fastened to the housing 2.

[0018] At least a part of the bolt fastening portion between the service hole cover 3 and the housing 2 (the left side portion of the opening 21 in FIG. 1) is adhesively fixed by an adhesive member such as a double-sided tape 322. In the reference form shown in FIG. 1, the double-sided tape 322 is pasted on the entire surface of at least a part of the fastening seating surface 321, which is a part of the fastening seating surface 32 of the service hole cover 3, and the seating surface 22 of the housing 2 facing the adhesive fastening seating surface 321.

[0019] Here, in the in-vehicle electric unit 1 mounted on the vehicle, when a high-output current flows, the copper bus bar of the live part 5 may be directly bolt-fastened. In this case, for example, an operator performs the fastening operation through the opening 21 of the housing 2. After the bolt fastening, the service hole cover 3 is attached to the opening 21 and the opening 21 is closed. However, if the operator does not follow the work procedure, removes the service hole cover 3, and touches the copper bus bar, there is a risk of electric shock.

[0020] In response to such problems, in the reference embodiment shown in FIG. 1, the service hole cover 3 is adhesively fixed to the housing 2. As a result, the service hole cover 3 cannot be detached from the housing 2 unless the adhesive portion is damaged, so that it is possible to prevent a situation where an operator does not follow the work procedure and to prevent electric shock.

[0021] However, if the structure is simply such that the double-sided tape is attached to the entire seating surface as in the reference embodiment of FIG. 1, the double-sided tape may sag due to vehicle vibration or heat, so there is a concern about a decrease in the bolt axial force between the service hole cover 3 and the housing 2.

[0022] FIG. 2 is a schematic diagram showing an example of the adhesion structure between the service hole cover 3 and the housing 2 according to the embodiment. The outline of FIG. 2 is the same as that of FIG. 1. The basic configuration of the embodiment shown in FIG. 2 is the same as that of the reference embodiment of FIG. 1, but the difference is that a partial step is provided on the adhesion fastening seating surface of the service hole cover 3.

[0023] As shown in FIG. 2, in the in-vehicle electric unit 1 according to the embodiment, the adhesion fastening seating surface of the service hole cover 3 (corresponding to the adhesion fastening seating surface 321 in FIG. 1) has an adhesion surface 321A for adhering the housing 2 and the service hole cover 3, and a protruding portion 321B protruding from the adhesion surface 321A toward the fastening seating surface 22 of the housing 2.

[0024] An adhesive member such as a double-sided tape 322 is provided between the adhesion surface 321A and the portion of the seating surface 22 of the housing 2 that faces the adhesion surface 321A. On the other hand, the protruding portion 321B is in surface contact with the portion of the seating surface 22 of the housing 2 that faces the end surface of the protruding portion 321B and is not adhered.

[0025] In the embodiment shown in Figure 2, the adhesive fastening seating surface of the service hole cover 3 is made into a stepped structure having an adhesive surface 321A and a protruding portion 321B. As a result, a part of the bolt fastening seating surface is in contact with the housing 2, so even if the double-sided tape 322 deteriorates over time, the bolt axial force between the service hole cover 3 and the housing 2 is maintained. Therefore, the in-vehicle electrical unit 1 according to this embodiment can suppress the decrease in the axial force of the bolt fastening between the housing 2 and the service hole cover 3.

[0026] Next, with reference to Figures 3 to 5, an example of a stepped structure between the adhesive surface 321A and the protruding portion 321B of the service hole cover 3 will be described.

[0027] Figure 3 is a perspective view showing a first example of the adhesive structure of the service hole cover 3 according to the embodiment. Figure 3(A) is an exploded perspective view showing the state in which the double-sided tape 322 is separated from the adhesive surface 321A. Figure 3(B) is an assembled perspective view showing the state in which the double-sided tape 322 is attached to the adhesive surface 321A.

[0028] The first example shown in Figure 3 is an example of a shape in which half of the adhesive fastening seat surface of the service hole cover 3 is stepped, as a means of setting a step between the adhesive surface 321A and the protruding portion 321B of the service hole cover 3. As shown in Figure 3, in the first example, half of the annular adhesive fastening seat surface along the circumferential direction is the adhesive surface 321A, and the other half is the protruding portion 321B.

[0029] Figure 4 is a perspective view showing a second example of the adhesive structure of the service hole cover 3 according to the embodiment. The outlines of Figures 4(A) and (B) are the same as those of Figures 3(A) and (B).

[0030] The second example shown in Figure 4 is an example of a shape in which the semicircular adhesive fastening seat surface of the service hole cover 3 is made into a step as a means of setting a step between the adhesive surface 321A and the protruding portion 321B of the service hole cover 3. As shown in Figure 4, in the second example, the radially central half of the annular adhesive fastening seat surface is the adhesive surface 321A, and the other radially centrifugal half is the protruding portion 321B.

[0031] Figure 5 is a perspective view showing a third example of the adhesive structure of the service hole cover 3 according to the embodiment. The outlines of Figures 5(A) and (B) are the same as those of Figures 3(A) and (B).

[0032] The third example shown in Figure 5 is an example of a shape in which the cross shape of the adhesive fastening seat surface of the service hole cover 3 is used as a means of setting a step between the adhesive surface 321A of the service hole cover 3 and the protruding portion 321B. As shown in Figure 5, in the third example, the adhesive surface 321A is formed in a cross shape along two orthogonal diametrical directions of the annular adhesive fastening seat surface. In addition, a bolt insertion hole is provided in the center of the adhesive fastening seat surface, so the adhesive surface 321A is divided into four parts by the bolt insertion hole in the central part of the cross shape. Each part of the adhesive surface 321A is formed with a constant width in the circumferential direction of the adhesive fastening seat surface, as shown in Figure 5, for example. On the other hand, the double-sided tape 322 is also divided into four parts so as to be the same shape as each adhesive surface 321A, so that it can be attached to each adhesive surface 321A.

[0033] On the other hand, four protrusions 321B are arranged between each adhesive surface 321A along the circumferential direction of the adhesive fastening seat surface. Each protrusion 321B is formed in a fan shape, for example, as shown in Figure 5. Therefore, in the third example, the four adhesive surfaces 321A and the four protrusions 321B are arranged alternately along the circumferential direction of the adhesive fastening seat surface.

[0034] It should be noted that the three structural examples described with reference to Figures 3 to 5 are merely examples. For example, contrary to the second example in Figure 4, it is also possible to make the radially central half of the annular adhesive fastening surface the protruding portion 321B, and the other radially centrifugal half the adhesive surface 321A.

[0035] The embodiments have been described above with reference to specific examples. However, this disclosure is not limited to these specific examples. Modifications made to these specific examples by those skilled in the art are also included within the scope of this disclosure, as long as they retain the features of this disclosure. The elements, their arrangement, conditions, shapes, etc., of each of the aforementioned specific examples are not limited to those illustrated and can be modified as appropriate. The elements of each of the aforementioned specific examples can be combined in different ways as appropriate, as long as no technical inconsistencies arise.

[0036] In the above example of implementation, a configuration in which double-sided tape 322 is provided between the housing 2 and the adhesive surface 321A of the service hole cover 3 was illustrated. However, as long as the housing 2 and the adhesive surface 321A can be bonded together, an adhesive material other than double-sided tape 322, such as an adhesive, may be used. [Explanation of Symbols]

[0037] 1. Vehicle-mounted electrical unit 2 cabinets 22 Fastening seating surface 3 Service Hole Covers 321 Adhesive fastening seat 321A Adhesive surface 321B Protrusion 322 Double-sided tape (adhesive material)

Claims

[Claim 1] An electrical unit installed in a vehicle, The casing and A service hole cover fastened to the housing with bolts, Equipped with, The fastening surface of the service hole cover is The adhesive surface for bonding the housing and the service hole cover, A protruding portion that extends beyond the adhesive surface toward the fastening seat surface of the housing, An adhesive member provided between the housing and the adhesive surface, Having, Automotive electrical unit.

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