JP7204377B2 - Part fixing structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a parts fixing structure for fixing a separate part to a main body, and an in-vehicle device to which the parts fixing structure is applied.

In a conventional vehicle-mounted device, an attachment part is screw-fixed to the housing of the vehicle-mounted device, and this attachment part is attached to the vehicle (see, for example, Patent Document 1).

Japanese Utility Model Laid-Open No. 61-4478

Here, it is assumed that the attachment part is fixed to the vehicle via another part such as a bracket. In this case, a bracket is screwed to the mounting part, which in turn is screwed to a part of the vehicle. In Patent Literature 1, a gap exists between the mounting part and the housing of the in-vehicle device. Therefore, metal scraps generated when the bracket is screwed to the mounting part go out of the mounting part through the gap, and enter the housing from the opening such as the ventilation hole formed in the housing of the in-vehicle device. I had a problem getting in. There is a possibility that the metal scraps that enter the housing may fall onto the board housed inside the housing, causing an electrical short circuit and malfunctioning of the in-vehicle equipment.

SUMMARY OF THE INVENTION The present invention was made in order to solve the above-mentioned problems, and it is an object of the present invention to prevent metal chips generated when a separate part such as a bracket and an attachment part are screwed together from coming out to the outside. aim.

The parts fixing structure according to the present invention corresponds to different parts having different shapes for each type of vehicle, and the mounting parts to which the corresponding different parts are screw-fixed and the mounting parts having different shapes for each type of vehicle are fixed respectively . The attachment part includes a screw fixing part for fixing another part with screws at a position with a gap between it and the outer surface of the main body, and the screw fixing part all around the outer surface of the main body. and a close contact fixing part that seals the gap between the screw fixing part and the outer surface of the main body by being fixed in close contact with the main body , and the crimped part of the close contact fixing part is attached to the crimped part of the main body. The numbers and positions of the crimped portions and the crimped portions of the main body portion and the closely-fixed portion are common regardless of the type of vehicle.

According to the present invention, since the gap between the screw fixing portion and the main body portion is a closed space, metal chips generated when the separate part and the mounting member are screw-fixed can be trapped outside the closed space. You can prevent it from going out.

1 is an exploded perspective view showing a configuration example of an in-vehicle device to which the parts fixing structure according to Embodiment 1 is applied; FIG. FIG. 4 is a perspective view showing a state in which the attachment part is fixed to the outer surface of the housing; FIG. 4 is a perspective view showing a state in which the attachment part and the bracket are fixed to the outer surface of the housing; FIG. 4 is a cross-sectional view of the in-vehicle device of FIG. 3 taken along line AA; FIG. 11 is an exploded perspective view showing a modification of the vehicle-mounted device to which the parts fixing structure according to the first embodiment is applied; FIG. 11 is an exploded perspective view showing a configuration example of a component fixing structure according to Embodiment 2;

Embodiment 1.
FIG. 1 is an exploded perspective view showing a configuration example of an in-vehicle device 10 to which a parts fixing structure according to Embodiment 1 is applied. The component fixing structure according to the first embodiment includes attachment component 40 and housing 20 . This component fixing structure is a structure for fixing the bracket 30, which is a separate component, to the housing 20 of the in-vehicle device 10, which is the main body. In Embodiment 1, the housing 20, the bracket 30, and the mounting part 40 are made of sheet metal.

The bracket 30 is a part for screwing the in-vehicle device 10 to the vehicle. The bracket 30 is formed with two holes 32 through which two screws (not shown) are passed. By passing the two screws (not shown) through the holes 32 and fastening them to the vehicle, the bracket 30 is It is screwed to the vehicle. Also, the bracket 30 is formed with two holes 31 through which screws 50 for fixing the bracket 30 to the in-vehicle device 10 are passed.

The shape of the bracket 30 used to fix the in-vehicle device 10 to the vehicle differs from vehicle to vehicle. Therefore, the position of the screw holes formed in the housing 20 for fixing the bracket 30 with screws also needs to be changed for each vehicle. Therefore, conventionally, it was necessary to manufacture many kinds of housings 20 having different positions of screw holes. Therefore, in the first embodiment, the housing 20 is made common by separating the screw hole portion for fixing the bracket 30 with screws as a separate component as the mounting component 40 . The mounting part 40 having screw hole portions (screw holes 42 to be described later) for screwing the bracket 30 is designed for each vehicle.

As shown in FIG. 1 , the attachment part 40 has a screw fixing part 41 shaped to protrude from the outer surface of the housing 20 . The screw fixing portion 41 is a convex portion for fixing the bracket 30 with a screw 50 at a position spaced apart from the outer surface of the housing 20 . A screw hole 42 for fastening a screw 50 is formed in the screw fixing portion 41 . Screws 50 are used to screw the bracket 30 to the mounting component 40 . In the illustrated example, one screw fixing portion 41 and one screw hole 42 are formed for one screw 50, but the configuration is not limited to this. For example, one screw fixing portion 41 may be formed for two screws 50 and two screw holes 42 may be formed in this screw fixing portion 41 . However, the number and positions of screw holes 42 must correspond to the number and positions of holes 31 in bracket 30 .

Moreover, the mounting part 40 has a close contact fixing portion 43 that is caulked and fixed in such a manner that the entire periphery of the screw fixing portion 41 is in close contact with the outer surface of the housing 20 . A burred hole is formed as a crimped portion 44 in the tightly fixed portion 43 . On the other hand, a crimped portion 21 is formed at a position facing the crimped portion 44 in the housing 20 . The crimped portion 21 is a hole into which the burring portion of the crimped portion 44 is inserted. The burring portion of the crimping portion 44 is inserted into the hole of the crimping portion 21 and the tip of the inserted burring portion is crimped, thereby crimping and fixing the attachment component 40 to the housing 20 . The number and positions of the crimped portions 21 and the crimped portions 44 are not limited to the illustrated example. However, the numbers and positions of the crimped portions 21 and the crimped portions 44 are common regardless of the vehicle. Further, the method of fixing the closely attached fixing portion 43 and the housing 20 is not limited to caulking, and any fixing method that does not generate metal chips may be used, such as resin rivets or welding.

Next, a procedure for assembling the component fixing structure will be described.
The operator first crimps the crimped portion 21 of the housing 20 and the crimped portion 44 of the mounting part 40 to crimp and fix the mounting part 40 to the housing 20 . FIG. 2 is a perspective view showing a state in which the attachment part 40 is fixed to the outer surface of the housing 20. FIG.

The operator then screws the bracket 30 to the mounting component 40 by threading the screws 50 through the holes 31 of the bracket 30 and tightening them into the screw holes 42 of the mounting component 40 . As a result, the bracket 30 is fixed to the housing 20 . FIG. 3 is a perspective view showing a state in which the attachment part 40 and the bracket 30 are fixed to the outer surface of the housing 20. FIG.

Finally, the operator screws a screw (not shown) through the hole 32 of the bracket 30 and fastens it to the vehicle, thereby fixing the bracket 30 to the vehicle. As a result, the in-vehicle device 10 is fixed to the vehicle.

FIG. 4 is a cross-sectional view of the in-vehicle device 10 of FIG. 3 taken along line AA. As shown in FIG. 4 , a close contact fixing portion 43 is formed around the entire periphery of the screw fixing portion 41 , and the close contact fixing portion 43 is in close contact with the outer surface of the housing 20 . A screw hole 42 formed in the screw fixing portion 41 is closed by a screw 50 . Therefore, the gap between the screw fixing portion 41 and the outer surface of the housing 20 becomes a sealed space 45, and even if metal chips are generated when the screws 50 are fixed to the screw holes 42, the metal chips are sealed. Do not go outside the space 45. Therefore, it is possible to prevent metal scraps from entering the housing 20 through the fan vents 22 or the like formed in the housing 20 and short-circuiting the substrates housed inside the housing 20 . In addition, since the hole 32 of the bracket 30 is formed at a position away from the housing 20 without overlapping with the housing 20, when a screw (not shown) is passed through the hole 32 and fixed to the vehicle, it can be fixed to the vehicle. Even if dust is produced, it is unlikely that it will enter the housing 20 through the fan vent 22 or the like.

Note that the length L1 from the outer surface of the housing 20 to the inner surface of the screw fixing portion 41 in the sealed space 45 is preferably longer than the length L2 of the shaft of the screw 50 . The shaft of the screw 50 is the portion of the screw 50 excluding the head, which is a so-called screw portion. Since L1>L2, the screw 50 can be reliably fastened to the screw hole 42. FIG. On the other hand, if L1≦L2, the tip of the screw 50 may reach the outer surface of the housing 20 during fastening, resulting in loosening of the screw 50 and insufficient fastening force.

In the examples of FIGS. 1 to 4, the mounting part 40 is formed with a convex portion to form the closed space 45, but the housing 20 may be formed with a concave portion. FIG. 5 is an exploded perspective view showing a modification of the in-vehicle device 10 to which the parts fixing structure according to the first embodiment is applied. As shown in FIG. 5 , a recess 23 is formed in the housing 20 and a crimped portion 21 is formed around the recess 23 . The mounting part 40 is a flat plate member, and has a screw hole 42 formed at a position facing the recess 23 and a crimped portion 44 formed at a position facing the crimped portion 21 . Around the entire circumference of the concave portion 23, the close contact fixing portion 43 of the attachment component 40 is crimped and fixed in a closely contact state. Therefore, the gap between the concave portion 23 and the attachment part 40 becomes a closed space.

As described above, the in-vehicle device 10 according to Embodiment 1 includes the bracket 30 fixed to the vehicle, the attachment part 40 to which the bracket 30 is screwed, and the screws 50 for screwing the bracket 30 and the attachment part 40 together. and a housing 20 to which the attachment part 40 is fixed. The mounting part 40 includes a screw fixing portion 41 for fixing the bracket 30 with a screw 50 at a position spaced apart from the outer surface of the housing 20, and the entire periphery of the screw fixing portion 41 is in close contact with the outer surface of the housing 20. It has a close contact fixing portion 43 that forms a closed space 45 in the gap between the screw fixing portion 41 and the outer surface of the housing 20 by being fixed in a closed state. This configuration can prevent metal chips generated when the bracket 30 and the attachment part 40 are screwed together from coming out of the sealed space 45 . In addition, by making the screw holes 42 for fixing the bracket 30 with screws as separate parts as the mounting parts 40, the housing 20 can be shared regardless of the vehicle.

In addition, in Embodiment 1, since the tight-fitting fixing portion 43 is caulked and fixed to the housing 20 , metal chips are not generated when the attachment component 40 is fixed to the housing 20 .

Further, in Embodiment 1, the length L1 from the outer surface of the housing 20 to the inner surface of the screw fixing portion 41 in the closed space 45 is longer than the length L2 of the shaft of the screw 50 . With this configuration, the screw 50 is securely fastened to the screw fixing portion 41 .

Further, in Embodiment 1, the screw fixing portion 41 is a convex portion formed on the attachment component 40 . This convex portion can be easily formed by drawing a sheet metal. The recess 23 of the housing 20 shown in FIG. 5 can also be formed by drawing, but the projection of the mounting part 40 is easier to draw than the recess 23 .

Embodiment 2.
FIG. 6 is an exploded perspective view showing a configuration example of a component fixing structure according to Embodiment 2. FIG. In Embodiment 1, the parts fixing structure for fixing the bracket 30, which is a separate part, to the housing 20 of the in-vehicle device 10, which is the main body, has been described. In Embodiment 2, a component fixing structure for fixing a board 30a, which is a separate component, to a housing 20, which is a main body, will be described. In FIG. 6, parts that are the same as or correspond to those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted.

The position of the hole 31 in the board 30a for passing the screw 50 differs depending on the mounting position of the electronic component. Therefore, it is necessary to change the positions of the screw holes formed in the housing 20 for fixing the substrate 30a with screws for each substrate 30a. Therefore, conventionally, it was necessary to manufacture many kinds of housings 20 having different positions of screw holes. Therefore, in the second embodiment, the housing 20 is made common by separating the screw hole portion for fixing the substrate 30a with screws as a separate component as the mounting component 40 .

As shown in FIG. 6, a mounting part 40 having a screw hole 42 for screwing the board 30a is fixed at a position facing the hole 31 of the board 30a. Specifically, the close contact fixing portion 43 of the attachment part 40 is fixed to the housing 20 by caulking, resin riveting, welding, or the like. A convex screw fixing portion 41 is formed in the mounting part 40 , and a screw hole 42 is formed in the screw fixing portion 41 . The screw 50 passes through the hole 31 formed in the substrate 30 a and is fastened to the screw hole 42 of the screw fixing portion 41 . Since the gap between the screw fixing portion 41 and the outer surface of the housing 20 is a closed space, even if metal chips are generated when the screw 50 is fixed to the screw hole 42, the metal chips are kept in the closed space. don't go outside

It should be noted that, within the scope of the present invention, it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component of each embodiment.

Reference Signs List 10 in-vehicle device 20 housing (main body) 21 crimped portion 22 fan vent 23 recess 30 bracket (separate part) 30a substrate (separate part) 31 hole 32 hole 40 mounting part 41 screw Fixing part 42 screw hole 43 close contact fixing part 44 caulking part 45 closed space 50 screw.

Claims (3)

Mounting parts that correspond to different parts with different shapes for each type of vehicle, and to which the corresponding different parts are screwed,
a common main body to which the mounting parts having different shapes for each type of vehicle are fixed,
The attachment component includes a screw fixing portion for fixing the separate component with screws at a position spaced apart from the outer surface of the main body, and a state in which the entire periphery of the screw fixing portion is in close contact with the outer surface of the main body. a tightly-fitting fixing portion that, when fixed, forms the gap between the screw fixing portion and the outer surface of the main body as a closed space;
The crimped portion of the close contact fixing portion is crimped and fixed to the crimped portion of the main body portion,
The parts fixing structure, wherein the number and positions of the caulked portions of the main body portion and the caulked portions of the tight contact fixing portion are common regardless of the type of vehicle. The component fixing structure according to claim 1, wherein the screw fixing portion is a convex portion formed on the attachment component. The length from the outer surface of the body portion to the inner surface of the screw fixing portion in the sealed space is
3. The parts fixing structure according to claim 1, wherein the length is longer than the length of the shaft of the screw for fixing the separate part and the screw fixing portion.

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