Waterproof construction

Abstract

This provides a waterproof structure that does not require the separate provision of sealing parts such as gaskets. [Solution] A waterproof structure comprising a part 12 and a mounting mat 11 to which the part is attached, wherein the part includes a part-side screw-fastening portion 13a that is screwed to the mounting mat, a rib portion 13b arranged on the outer circumference of the part, and a part-side intermediate portion 13c between the part-side screw-fastening portion and the rib portion, and the mounting mat includes a mounting mat side screw-fastening portion 11a to which the part-side screw-fastening portion is screwed, a contact portion 11b to which the rib portion abuts, a mounting mat side intermediate portion 11c between the mounting mat side screw-fastening portion and the contact portion, and a screw N1 that fastens the part-side screw-fastening portion and the mounting mat side screw-fastening portion.

Description

Technical Field

[0001] The present disclosure relates to a waterproof structure.

Background Art

[0002] A waterproof structure is known in which a seal part such as a packing is sandwiched between a part (cover part) and a mating part (base part) to which this part is attached, and both are screwed together (see, 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] However, in Patent Document 1, there is a problem that a seal part such as a packing has to be separately prepared, increasing the number of parts and the assembly man-hours.

[0005] The present disclosure has been made to solve such problems, and provides a waterproof structure in which a seal part such as a packing does not have to be separately prepared.

Means for Solving the Problems

[0006] The waterproof structure according to this disclosure comprises a component and a mounting mat to which the component is attached, wherein the component includes a component-side screw-fastening portion that is screwed to the mounting mat, a rib portion disposed on the outer circumference of the component, and a component-side intermediate portion between the component-side screw-fastening portion and the rib portion, the mounting mat includes a mounting mat side screw-fastening portion to which the component-side screw-fastening portion is screwed, a contact portion to which the rib portion abuts, a mounting mat side intermediate portion between the mounting mat side screw-fastening portion and the contact portion, and a screw that fastens the component-side screw-fastening portion and the mounting mat side screw-fastening portion, wherein the component-side intermediate portion bends due to elastic deformation when the component-side screw-fastening portion and the mounting mat side screw-fastening portion are fastened together by the screw, and the edge of the rib portion makes line contact with the contact portion due to the elastic force, and the mounting mat does not undergo plastic deformation when the edge of the rib portion is in line contact with the contact portion due to the elastic force. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a waterproof structure that does not require the separate provision of sealing parts such as gaskets. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of an in-vehicle device 1 equipped with a waterproof structure, which is an embodiment of the device. [Figure 2] This is a perspective view of the top panel 11 with the cover 12 attached, extracted from Figure 1. [Figure 3] This is a cross-sectional view AA in Figure 2. [Figure 4] This is a perspective view of cover 12A, which is a modified example. [Modes for carrying out the invention]

[0009] The following describes an in-vehicle device 1 with a waterproof structure, which is an embodiment of the device, with reference to the attached drawings. In each figure, corresponding components are denoted by the same reference numerals, and redundant explanations are omitted.

[0010] Figure 1 is a perspective view of an in-vehicle device 1 equipped with a waterproof structure, which is an embodiment of the device. This waterproof structure is not limited to the in-vehicle device 1, but may be applied to various devices that require waterproofing (equivalent to IPX2).

[0011] The in-vehicle device 1 is installed in a vehicle such as an automobile. The in-vehicle device 1 comprises a main unit 10 and a head unit 20.

[0012] The device body 10 includes a top plate 11 (an example of a mounting surface in this disclosure) provided with a recess S1 (bracket) on which an antenna 14 (for example, a GNSS antenna) is positioned, and a cover 12 (an example of a component in this disclosure) attached to the top plate 11 while covering the recess S1.

[0013] The main body of the device 10 is installed on the rear side of the head unit 20 in an inclined position at a predetermined angle θ1 (vehicle mounting angle).

[0014] This section describes the path of water droplets that dripped from the top of the panel of the head unit 20.

[0015] As indicated by arrows Ar1 and Ar2 in Figure 1, water droplets dripping from the top of the head unit 20 panel run down the rear cover 21 and onto the top plate 11 and cover 12. The water droplets that drip onto cover 12 flow directly to the back and are drained away. Meanwhile, the water droplets that drip onto top plate 11 run down the top plate 11 and enter the housing of the main body 10 through the gap between top plate 11 and cover 12.

[0016] The in-vehicle device 1 is equipped with a waterproof structure to prevent water droplets running down the top plate 11 from entering the housing of the device body 10 through the gap between the top plate 11 and the cover 12. This waterproof structure will be described below.

[0017] Figure 2 is a perspective view of the top panel 11 with the cover 12 attached, extracted from Figure 1. Figure 3 is a cross-sectional view of AA in Figure 2.

[0018] As shown in FIG. 3, the cover 12 is a cover that covers the recess S1 provided in the top plate 11. The cover 12 includes a cover body 13. The outer shape of the cover body 13 is rectangular corresponding to the rectangular recess S1. The cover 12 is, for example, made of resin, but may be made of a material that elastically deforms when the cover 12 is screwed to the top plate 11 as described later, and is not limited to resin.

[0019] The cover body 13 includes a component-side screw portion 13a that is screwed to the top plate 11 which is the mating part to which the cover 12 is attached, rib portions 13b disposed on both sides of the outer peripheral portion of the cover 12, specifically, both sides (left and right sides in FIG. 3) of the component-side screw portion 13a, and a component-side intermediate portion 13c between the component-side screw portion 13a and the rib portions 13b.

[0020] The rib portions 13b are provided along two opposite sides L1 and L2 (see FIG. 2) of the cover body 13, specifically, on both sides of the component-side screw portion 13a. The rib portions 13b are provided in the range indicated by reference numeral A1 in FIG. 2. The component-side screw portion 13a is provided approximately at the center between one rib portion 13b (left side in FIG. 3) and the other rib portion 13b (right side in FIG. 3).

[0021] The component-side screw portion 13a is disposed at a position one step lower than the cover body 13 (component-side intermediate portion 13c).

[0022] Also, a thin portion 13d is provided inside the rib portions 13b of the cover 12 (cover body 13) and in the vicinity of the rib portions 13b. The thin portion 13d is provided to make the cover 12 easily elastically deformable. The thin portion 13d is provided in the range indicated by reference numeral A1 in FIG. 2.

[0023] On the other hand, the top plate 11 to which the cover 12 is attached includes a mounting-side screw-fastening portion 11a to which the component-side screw-fastening portion 13a is screwed, contact portions 11b arranged on both sides (left and right sides in Figure 3) of the mounting-side screw-fastening portion 11a to which the rib portion 13b abuts, an intermediate portion 11c on the mounting-side between the mounting-side screw-fastening portion 11a and the contact portion 11b, and a sloped surface 11d connecting the contact portion 11b and the intermediate portion 11c on the mounting-side.

[0024] The mounting mating screw portion 11a and the mounting mating intermediate portion 11c constitute the bottom surface of the recess S1. On the other hand, the inclined surface 11d constitutes the inner wall (side surface) of the recess S1. The recess S1 provided in the top plate 11 is rectangular in shape.

[0025] The contact portion 11b is the part that the rib portion 13b contacts. The contact portions 11b are provided on both sides (left and right sides in Figure 3) of the mounting mating screw portion 11a, corresponding to the rib portions 13b provided on both sides of the component-side screw portion 13a. The contact portions 11b are provided in the area indicated by reference numeral A1 in Figure 2. The mounting mating screw portion 11a is provided approximately in the center between one contact portion 11b (left side in Figure 3) and the other contact portion 11b (right side in Figure 3).

[0026] A protrusion 11e is provided on the inside of the contact portion 11b of the top plate 11, and near the contact portion 11b, projecting toward the cover 12. The protrusion 11e is provided, for example, by drawing the top plate 11. The protrusion 11e is provided in the area indicated by the reference numeral A1 in Figure 2. The space 30 between the protrusion 11e and the rib portion 13b functions as a drainage channel.

[0027] Next, an example of constructing a waterproof structure by fastening the cover 12 (part-side screw-fastening portion 13a) and the top plate 11 (mounting mating side screw-fastening portion 11a) with screws N1 will be described.

[0028] First, as shown in Figure 3, the cover 12 is placed on the top plate 11 with the rib portion 13b in contact with the contact portion 11b, and the screw fastening portion 13a on the component side and the screw fastening portion 11a on the mounting mating side facing each other.

[0029] In this state, if the gap between the component-side screwing portion 13a and the mating-side screwing portion 11a is d, and the gap between the component-side intermediate portion 13c and the convex portion 11e is e, then before screwing with the screw N1, the relationship is d < e.

[0030] Next, the component-side screwing portion 13a and the mating-side screwing portion 11a are screwed with the screw N1. At this time, the convex portion 11e and the component-side intermediate portion 13c are made to contact or approach as closely as possible so that the rib portion 13b is not loaded by the contact of the contact portion 11b. As a result, the gap d between the component-side screwing portion 13a and the mating-side screwing portion 11a disappears. At this time, since the thin portion 13d is provided inside the rib portion 13b of the cover 12 (cover body 13) and in the vicinity of the rib portion 13b, the cover 12 (cover body 13) flexes mainly by elastically deforming at the thin portion 13d. As a result, the edge E of the rib portion 13b is urged against the contact portion 11b of the top plate 11 with a uniform (or substantially uniform) force and comes into line contact (refer to the "enlarged cross-sectional view (after screwing) within the circle C2" in FIG. 3). Thereby, the adhesion of the edge E of the rib portion 13b to the top plate 11 (contact portion 11b) is enhanced, and the intrusion path of water droplets is blocked. As a result, it is possible to prevent water droplets passing over the top plate 11 from entering the inside of the housing of the apparatus main body 10 through the gap between the top plate 11 and the cover 12. Note that the top plate 11, which is the mating part of the cover 12, may be made of a material that does not plastically deform in a state where the edge E of the rib portion 13b is in line contact with the contact portion 11b by the elastic force (for example, made of metal), and is not limited to being made of metal.

[0031] The reason for making the edge E of the rib portion 13b in line contact with the contact portion 11b instead of making the rib portion 13b in surface contact with the contact portion 11b is that it is difficult to form a precise plane due to the presence of fine irregularities. If the rib portion 13b is made in surface contact with the contact portion 11b, there is a risk that water droplets may enter between them due to these fine irregularities.

[0032] Furthermore, even when the edge E of the rib portion 13b is in line contact with the contact portion 11b, if heat is applied to the cover 12, the cover 12 will deform due to residual stress caused by its bending, creating a gap between the cover 12 and the top plate 11, and there is a risk that water droplets may seep in through this gap.

[0033] Water droplets that enter through the gap between the cover 12 (edge ​​E of the rib portion 13b) and the top plate 11 (contact portion 11b) are drained through the space 30 between the protrusion 11e and the rib portion 13b. That is, as shown by arrows Ar1 and Ar2 in Figure 1, water droplets that drip from the top of the panel of the head unit 20 run down the rear cover 21 and drip onto the top plate 11 and cover 12. Water droplets that drip onto cover 12 flow directly to the back and are drained. On the other hand, water droplets that drip onto top plate 11 run down the top plate 11 and enter the space 30 between the protrusion 11e and the rib portion 13b through the gap between the cover 12 (edge ​​E of the rib portion 13b) and top plate 11 (contact portion 11b), and flow within the space 30 in the direction of arrow Ar3 in Figure 1 and are drained. Thus, the space 30 between the protrusion 11e and the rib portion 13b functions as a drainage channel for water droplets that have entered the space 30 through the gap between the cover 12 (edge ​​E of the rib portion 13b) and the top plate 11 (contact portion 11b).

[0034] The above double drainage structure makes it possible to achieve a waterproof structure that satisfies the waterproof level (equivalent to IPX2). In addition, the elastic force of the elastically deformed cover 12 causes the edge E of the rib portion 13b to make uniform (or approximately uniform) line contact with the contact portion 11b of the top plate 11. In other words, the edge E of the rib portion 13b biases the contact portion 11b of the top plate 11. This also makes it possible to suppress rattle noise when the main body 10 vibrates.

[0035] As described above, this embodiment provides a waterproof structure that does not require the separate provision of sealing parts such as gaskets.

[0036] Furthermore, according to this embodiment, by screwing the cover 12, which is a springy component made of resin or the like, to the top plate 11 while allowing it to flex, the edge E of the rib portion 13b of the cover 12 adheres to the contact portion 11b of the top plate 11 with uniform force, thereby creating a waterproof structure. This makes it possible to satisfy the required specifications (IPX2) without using O-rings or rubber gaskets.

[0037] Furthermore, according to this embodiment, the required specifications (IPX2) can be satisfied with only a small number of screw mounting points.

[0038] Furthermore, according to this embodiment, since O-rings and rubber gaskets are not used, the required specifications (IPX2) can be satisfied without considering rigidity.

[0039] Furthermore, according to this embodiment, since O-rings and rubber gaskets are not used, the use of grease is unnecessary, and the number of screws can be reduced. Therefore, assembly man-hours can be reduced.

[0040] Furthermore, according to this embodiment, since the edge E of the rib portion 13b of the cover 12 is in close contact with the contact portion 11b of the top plate 11 with uniform force, rattle noise when the device body 10 vibrates can be suppressed.

[0041] Next, I will explain some variations.

[0042] Figure 4 is a perspective view of cover 12A, which is a modified example.

[0043] In the above embodiment, an example was described in which the recess provided in the top plate 11 is a rectangular recess S1, and the outer shape of the cover body 13 corresponds to the rectangular recess S1 and is rectangular. However, the embodiment is not limited to this. For example, the recess provided in the top plate 11 may be a circular recess S2, and the outer shape of the cover body 13A may correspond to the circular recess S2 and be circular.

[0044] In this case, the rib portion 13b, the thin-walled portion 13d, the contact portion 11b, and the protrusion 11e may be arranged in a ring shape surrounding the screw-fastening portion 13a on the component side. Specifically, the rib portion 13b, the thin-walled portion 13d, the contact portion 11b, and the protrusion 11e may be provided in a ring shape (concentrically) along the outer circumference of the circular cover 12 (cover body 13).

[0045] This modified version can also achieve the same effects as the above embodiment.

[0046] The numerical values ​​shown in the above embodiments are all examples, and it goes without saying that other appropriate numerical values ​​can be used.

[0047] The embodiments described above are in all respects only as examples. The description of the embodiments above should not be construed as limiting the disclosure. The disclosure can be implemented in various other ways without departing from its spirit or main features. [Explanation of Symbols]

[0048] 1…In-vehicle device 10…Main unit of the device 11… Tabletop 11a... Mounting mating screw part 11b...Abutting part 11c...Intermediate part on the mounting side 11d... slope 11e…convex part 12, 12A...cover 13, 13A... Cover body 13a... Component-side screw fastening part 13b... Rib section 13c...Intermediate part of the component 13d...thin-walled section 14… Antenna 20... Head unit 21... Rear cover 30…Space E... Edge N1... screw S1, S2... recessed

Claims

1. A waterproof structure comprising a component and a mounting surface to which the component is attached, The aforementioned part is, The screw-fastening portion on the component side that is screwed to the mating object, Rib portion arranged on the outer circumference of the aforementioned part, Including the intermediate portion on the component side between the screw fastening portion on the component side and the rib portion, The aforementioned mounting mat is, The screw-fastening portion on the part side is screwed to the screw-fastening portion on the mounting mating side, The contact portion that the rib portion abuts against, The intermediate portion on the mounting side between the mounting mating screw fastening portion and the contact portion, The screw includes a screw for fastening the screw fastening portion on the part side and the screw fastening portion on the mounting mating side, With the screw-fastening portion on the component side and the screw-fastening portion on the mounting mating side fastened together by the screw, the intermediate portion on the component side bends due to elastic deformation, and the edge of the rib portion makes line contact with the contact portion due to the elastic force. The mounting surface has a waterproof structure in which the edge of the rib portion does not undergo plastic deformation while in line contact with the contact portion due to the elastic force.

2. The aforementioned intermediate portion on the mating side includes a protrusion that extends toward the component side, The waterproof structure according to claim 1, wherein, when the gap between the screw-fastening portion on the component side and the screw-fastening portion on the mating side is d, and the gap between the intermediate portion on the component side and the protrusion is e, d < e before fastening with the screw.

3. The waterproof structure according to claim 2, wherein the space between the protrusion and the rib portion functions as a drainage channel.

4. The rib portion is arranged on both sides of the screw fastening portion on the component side, The waterproof structure according to claim 2, wherein the contact portion is arranged on both sides of the mounting mating screw portion corresponding to the rib portion.

5. The waterproof structure according to claim 1, wherein a thin-walled portion is provided in the intermediate portion of the component side.

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