JP2007087666A - Ventilation member and ventilation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation member excelling in durability against foreign matter such as water and dust. <P>SOLUTION: This ventilation member 100 is provided with: a support body 21 with a ventilation film 2 arranged thereon so as to close one-side opening of a through-hole 21h used as a ventilation passage; and a cover component 11 covering the support body 21 from the side where the ventilation film 2 arranged. The cover component 11 includes a ceiling part 13 facing the the ventilation film 2 and a side wall part 15 circumferentially surrounding the support body 21. In the ceiling part 13 of the cover component 11, a ventilation hole 13h making a space between the ceiling part 13 and the ventilation film 2 communicate with the outside of the cover component 11 is formed at a position without axially overlapping the ventilation film 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ventilation member that is attached to a housing that houses an electrical component of an automobile. Moreover, it is related with the ventilation structure for ventilating a housing | casing.

  A casing that accommodates automotive electrical components such as lamps, sensors, or ECUs is provided with a ventilation member that secures ventilation between the inside and outside of the casing and prevents entry of foreign matter into the casing. . An example of such a ventilation member is disclosed in Patent Document 1.

As shown in FIG. 16, the ventilation member disclosed in Patent Document 1 includes a support body 103 on which the ventilation film 102 is arranged, and a protection unit 104 fitted into the support body 103 so as to cover the ventilation film 102. ing. Such a ventilation member 101 is fixed to the opening 107 of the housing 106 via the O-ring 105. By allowing the gas to permeate through the gas permeable membrane 102, it is possible to ensure ventilation inside and outside the housing 106. The protection unit 104 prevents the gas permeable membrane 102 from being damaged by an external force, and the air permeability of the gas permeable membrane 102 from being lowered due to dust accumulation.
JP 2004-47425 A

  In recent years, there has been a demand for a ventilation member that is more excellent in durability against foreign matters. For example, as a ventilation member used for a lamp of an automobile or a casing of an ECU, a ventilation member that can withstand car washing, particularly high-pressure washing, and can completely block water from entering the casing is required.

  An object of the present invention is to provide a ventilation member and a ventilation structure excellent in durability against foreign matters such as water, oils such as engine oil and brake oil, and dust.

  In order to solve the above problems, the first configuration of the ventilation member according to the present invention is such that a through hole serving as a ventilation path inside and outside the casing to be ventilated is formed, and a ventilation film is formed so as to block one opening of the through hole. And a cover part that covers the support from the side on which the gas permeable membrane is arranged, and the direction parallel to the thickness direction of the gas permeable membrane is defined as the axial direction and is blocked by the gas permeable membrane in the axial direction. When the side where the opening is located is defined as the upper side and the side where the opening connected to the housing is defined as the lower side, the cover parts are in an assembled state in which the relative positions are fixed with the support disposed inside. A ceiling portion that faces the gas permeable membrane and a side wall portion that extends from the periphery of the ceiling portion to a lower side in the axial direction than the position where the gas permeable membrane is disposed and surrounds the support body in the circumferential direction. On the ceiling of the part, it is formed between the ceiling and the ventilation membrane in the assembled state And a ventilation hole communicating with the outside of the cover component, and the ventilation hole and the ventilation region of the ventilation membrane have a positional relationship that does not overlap in the axial direction. .

  According to the present invention, the side wall portion of the cover part surrounds the support body on which the gas permeable membrane is disposed. Therefore, even when foreign matter such as water droplets comes from the lateral direction (in-plane direction) It is possible to prevent foreign matters from directly attaching to the film. Furthermore, since the vent hole is formed in the ceiling part of the cover part, the air permeability inside and outside the cover part is enhanced, and moisture can be prevented from accumulating inside the cover part. Since the vent hole in the ceiling part of the cover part is formed at a position that does not overlap the vent film in the axial direction, it is possible to prevent the foreign matter from coming directly from the axial direction from adhering to the vent film. In addition, the ventilation member of the present invention may be attached to the housing with the cover component vertically downward (see FIG. 8). In such a case, if water enters the cover component, the water will enter the cover component. May accumulate as is. However, according to the ventilation member of the present invention, even if water enters the cover part, it is possible to immediately drain water from the ventilation hole. Thus, the ventilation member of the present invention has extremely high durability against foreign matters such as water and dust.

  In a preferred aspect, the cover component further includes a cover side engaging portion that is provided at a plurality of locations along the circumferential direction on the inner surface of at least one of the ceiling portion and the side wall portion and engages the support. In this case, the vent hole of the cover component can be formed in the ceiling portion so as to be positioned between the adjacent cover side engaging portions. In this way, it is not necessary to consider the increase in the size of the cover part by forming the vent hole.

  By the way, the vent hole of the cover part can be formed in the side wall portion. That is, the second configuration of the ventilation member according to the present invention is such that the gap formed between the ceiling portion and the ventilation film in the assembled state on the side wall portion of the cover component and the ventilation hole communicating with the outside of the cover component. Alternatively, a notch is formed, and when the cover part and the support body are in an assembled state, a vent hole or notch is provided to prevent the vent hole or notch from directly facing the vent film in the in-plane direction perpendicular to the axial direction. Is.

  Simply forming a ventilation hole or notch in the side wall of the cover component may cause a foreign substance such as a water droplet to directly hit the ventilation membrane. Therefore, a partition wall is provided to prevent the ventilation hole or notch from directly facing the ventilation film in the in-plane direction. In this way, even when a foreign substance comes from the lateral direction (in-plane direction), it is possible to prevent water droplets or the like from directly attaching to the ventilation film. Further, by forming a vent or a notch, it is possible to improve the air permeability inside and outside the cover part, and the same drainage as the first configuration can be expected.

  The partition walls described above can be provided as part of the cover part and / or the support. In this way, there is no problem of increasing the number of parts. In a more preferred aspect, the support has a main body in which a through-hole serving as a ventilation path inside and outside of the housing is formed, and a ventilation film is disposed so as to block one opening of the through-hole, and a periphery of the main body. And a support-side engaging portion provided along the direction. The cover component further includes a cover side engagement portion that is provided on at least one inner surface of the ceiling portion and the side wall portion and engages with the support side engagement portion of the support body. Then, the vent hole or the notch is formed in a positional relationship corresponding to the cover side engaging portion in the circumferential direction of the cover component, so that the engaging portion by the support side engaging portion and the cover side engaging portion is passed. It can also be used as a partition wall for pores or notches. In this case, there is no need to separately provide a partition wall, so that there is no problem that the size of the cover part is greatly increased or the structure of the ventilation member is complicated by forming the ventilation holes or notches. .

  Moreover, the structure which does not require a ventilation hole can also be proposed. That is, the ventilation structure of the present invention is a ventilation structure that includes an opening of a housing to be ventilated and a ventilation member attached to the opening, and the ventilation member serves as a ventilation path inside and outside the housing. A main body portion having a through hole and a ventilation film disposed so as to block one opening of the through hole, and an opening portion provided in the housing and connected to the other opening side of the through hole of the main body portion A support body including a leg portion to be inserted and a cover part that covers the support body from the opposite side of the leg portion, and a direction parallel to the thickness direction of the ventilation membrane is an axial direction, and a direction perpendicular to the axial direction is a surface. When defining the inward direction as the side where the gas permeable membrane is located in the axial direction as the upper side and the side where the leg portion is located as the lower side, the support body has a main body portion so as to secure the arrangement region of the gas permeable membrane around the through-hole. Bulges outward in the in-plane direction, and the legs are located inside the projecting body. And a support-side engagement portion provided along the circumferential direction of the main body, and the cover component is an assembled state in which the support is disposed on the inner side and the relative position of each other is fixed. A ceiling portion that faces the gas permeable membrane, and a side wall portion that extends from the periphery of the ceiling portion to the lower side in the axial direction than the position where the gas permeable membrane is disposed, and surrounds the main body portion of the support body in the circumferential direction A cover side engaging portion that is provided on an inner surface of at least one of the ceiling portion and the side wall portion and engages with the support side engaging portion of the support body. And the cover side engaging portion are engaged with each other to form an assembled state, and a first gap that functions as a ventilation path is formed between the ceiling portion and the ventilation film, and the leg portion is attached to the casing. The main body is attached to the housing directly or via other parts. When the actual use state is reached, a second gap through which gas can flow is generated between the lower end of the side wall portion of the cover part and the housing, and ventilation is performed through the first gap and the second gap through the ventilation film. The relative length of the cover part and the support body in the axial direction is adjusted so as to be performed.

  The ventilation structure of the present invention is of a type in which a ventilation member is inserted into an opening of a housing to be ventilated. Since the ventilation member covers the side of the support on which the ventilation membrane is disposed with a cover component, the ventilation member is excellent in durability against foreign matters such as water droplets. In addition, the length of each part in the axial direction is adjusted so that a gap through which gas can flow is formed between the lower end of the side wall portion of the cover part and the housing, so that the air permeability inside and outside the cover part is improved. It can be kept good, and as a result, ventilation through the ventilation membrane can be performed efficiently.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of a ventilation member of the present invention. FIG. 2 is a cross-sectional view of a ventilation structure formed by attaching the ventilation member of FIG. 1 to a housing. FIG. 3 is an exploded perspective view of the ventilation member shown in FIGS. 1 and 2. 15 is an overall perspective view of the ventilation structure of FIG. As shown in FIGS. 2 and 15, the opening 52 of the casing 51 of the automobile electrical component and the ventilation member 100 attached to the opening 52 prevent the entry of foreign matter such as water droplets while preventing the entry of the casing 51. A ventilation structure 500 for ventilating the inside is configured.

  As shown in FIGS. 1 to 3, the ventilation member 100 is formed from the opposite side of the support body 21 having a through hole 21 h serving as an internal and external ventilation path of the housing 51 and the side inserted into the opening 52 of the housing 51. And a cover part 11 that covers the support 21. One opening of the through hole 21 h formed in the support 21 is closed by the gas permeable membrane 2, and the other opening is opened toward the inside of the housing 51. The gas permeable membrane 2 allows gas to pass through, but prevents foreign matter such as water droplets and dust from entering the housing 51. By the action of the gas permeable membrane 2, the pressure in the casing 51 is kept equal to the external pressure. The cover component 11 is formed with a vent 13h through which liquid and gas can flow inside and outside the cover component 11 so that ventilation through the gas permeable membrane 2 can be efficiently performed. Even when foreign matter enters the cover part 11 from the vent hole 13h, the vent hole 13h is formed so as to prevent the foreign matter from directly hitting the breathable membrane 2. Located far away from the hotel. Thereby, it is possible to prevent foreign matter from adhering to the gas permeable membrane 2 while ensuring good air permeability inside and outside the cover member 11.

  Hereinafter, after describing individual components, the relationship between the components will be described in detail. In the present specification, a direction parallel to the thickness direction of the gas permeable membrane 2 is defined as an axial direction, and a direction perpendicular to the axial direction is defined as an in-plane direction. In other words, the axial direction is a direction parallel to the central axis O of the through hole 21h. Further, in the axial direction, the side where the opening closed by the gas permeable membrane 2 is located is defined as the upper side, and the side where the opening connected to the housing 51 is located is defined as the lower side.

As shown in FIGS. 1 to 3, the support body 21 includes a main body portion 23, leg portions 25 a and 25 b, and a support body side engagement portion 27. Body portion 23 is a portion through hole 21h responsible vent path AR ₁ inside and outside the housing 51 to be subjected to ventilation is formed in the center, ensuring the placement area of the breathable film 2 around the through-hole 21h Therefore, it has a substantially donut shape (or substantially cylindrical shape) protruding outward in the radial direction. The gas permeable membrane 2 is disposed in the main body portion 23 so as to block one opening of the through hole 21h. The leg portions 25a and 25b are connected to the main body portion 23 on the side opposite to the side where the gas permeable membrane 2 is disposed, and extend downward in the axial direction. This is a mechanism for fixing the main body 23 to the housing 51 by inserting the leg portions 25 a and 25 b into the opening 52 of the housing 51. The support-side engaging portion 27 is a portion for fixing the cover component 11 and is provided at three equiangular intervals (a plurality of locations) along the circumferential direction of the main body portion 23 so as to surround the gas permeable membrane 2. At the same time, it has an upwardly protruding shape so that a gap between the cover part 11 and the gas permeable membrane 2 can be easily secured.

  The leg portions 25a and 25b of the support 21 are divided into six along the circumferential direction. Of these six leg portions 25a and 25b, three leg portions 25a have a fixing portion 251a on the side opposite to the main body portion 23, that is, the side to be inserted into the opening 52 of the housing 51. The fixed portion 251a is a portion that protrudes outward in the radial direction. The leg portions 25a having the fixing portions 251a and the leg portions 25b not having the fixing portions 251a are alternately arranged.

  On the lower surface side of the main body 23 of the support body 21 (on the side opposite to the surface on which the gas permeable membrane 2 is fixed), the seal ring 7 surrounding the leg portions 25a and 25b is disposed. The seal ring 7 is made of rubber. When the leg portions 25 a and 25 b are pushed firmly into the opening 52 of the housing 51, the support 21 is opened by the elastic restoring force of the seal ring 7 sandwiched between the main body 23 and the housing 51. It is urged in the direction to leave the portion 52. At this time, the fixing portion 251 a exposed inside the housing 51 plays a role of returning, and prevents the leg portions 25 a and 25 b from coming out of the opening 52 of the housing 51. As a result, the ventilation member 100 is fixed to the housing 51. The ventilation member may be fixed to the housing 51 by inserting (threading) the threaded leg portion into the opening 52 of the housing 51.

  The support body 21 as described above can be formed by a general molding technique such as injection molding or extrusion molding, with the main body portion 23, the leg portions 25a and 25b, and the support body side engaging portion 27 being all integrated. . It is preferable to use a thermoplastic resin for the material of the support 21 from the viewpoint of moldability. For example, various thermoplastic elastomers such as olefin, styrene, urethane, ester, amide, and vinyl chloride, or various heat such as polyolefin, polyamide, polyester, polyacetal, polysulfone, polyacryl, polyphenylene sulfide, etc. Various rubbers such as a plastic resin, chloroprene rubber, isoprene rubber, styrene butadiene rubber, natural rubber, or a composite material thereof can be used. The material of the support 21 may contain pigments such as carbon black and titanium white, reinforcing fillers such as glass particles and glass fibers, and a water repellent material.

  The gas permeable membrane 2 fixed to the support 21 can be made of a material having dust resistance, water resistance and air permeability. A woven fabric, a non-woven fabric, a net, a powder sintered porous body having a pore diameter of 10 μm or more, or a foam can be used as the gas permeable membrane 2 as long as water droplets are prevented from entering. Further, a plurality of these materials may be used in combination, or a multi-layered material may be used. When the surface is hydrophilic, it may be coated with a water- and oil-repellent agent such as fluorine or silicon.

  When higher waterproofness is required, it is preferable to use a resin porous membrane that can be produced by a known stretching method or extraction method, particularly a fluororesin porous membrane. The pore diameter of such a porous membrane can be 10 μm or less. If necessary, the above-described water / oil repellent may be coated. From the viewpoint of expecting sufficient waterproofness, the average pore diameter of the porous membrane is desirably 0.01 μm or more and 10 μm or less. In the present embodiment, a porous film made of polytetrafluoroethylene is used as the gas permeable film 2. In the present embodiment, the gas permeable membrane 2 is thermally welded to the support 21, but may be fixed by other means such as using an adhesive.

  Moreover, a breathable reinforcing layer may be laminated on the gas permeable membrane 2, and in this case, the strength of the gas permeable membrane 2 can be improved. As a material for the reinforcing layer, it is preferable that the breathable film 2 has better air permeability. For example, a woven fabric, a nonwoven fabric, a mesh, a net, a sponge, a foam, a porous body, or the like made of resin or metal can be used. The gas permeable membrane 2 and the reinforcing layer may be joined by a technique such as adhesive laminating, heat laminating, heat welding, or ultrasonic welding.

  Next, the cover component 11 will be described. 6A and 6B are perspective views of cover parts. As shown in FIG. 6, the cover component 11 includes a ceiling portion 13, a side wall portion 15, and a cover side engagement portion 17, and as a whole, prevents foreign matter such as water droplets from directly attaching to the gas permeable membrane 2. It has a cap-like shape suitable for. The ceiling portion 13 has a substantially disk shape, and cover side engaging portions 17 are arranged at equiangular intervals at three locations (a plurality of locations) along the circumferential direction. Between the adjacent cover side engaging parts 17 and 17, the vent hole 13h which penetrates the inside and outside of the cover part 11 is formed elongated along the circumferential direction. The side wall part 15 has a cylindrical shape extending substantially straight downward from the periphery of the ceiling part 13. The length of the side wall 15 in the axial direction is sufficient to surround the entire main body 23 of the support 21. The ceiling part 13 and the side wall part 15 are connected at a place where the cover side engaging part 17 is disposed. Such a cover component 11 uses the same material as the support 21 and can integrally produce the ceiling portion 13, the side wall portion 15, and the cover side engagement portion 17 by a known injection molding method.

  In the present embodiment, the vent hole 13h has an elongated groove shape, but the present invention is not limited to this. For example, a plurality of vent holes 14h, 14h may be formed between adjacent cover side engaging portions as in the cover part 11 'shown in FIG. Further, although the cover side engaging portion 17 is provided on the inner side surface of the ceiling portion 13, the cover side engaging portion may be provided on the inner side surface of the side wall portion 15.

Next, the relative positional relationship between the cover part 11, the support body 21, and the gas permeable membrane 2 will be described. As shown in FIG. 2, in the assembled state in which the cover side engaging portion 17 and the support body side engaging portion 27 are engaged and the cover component 11 and the support body 21 are fixed, the gas permeable membrane 2, the cover component 11, The support 21 and the seal ring 7 are concentrically arranged sharing the central axis O. In the assembled state, a gap is generated between the ceiling portion 13 of the cover part 11 and the gas permeable membrane 2. This gap serves as a ventilation channel AR _2. Similarly, in the assembled state, a gap that functions as the ventilation path AR ₃ is generated between the main body 23 of the support 21 and the side wall 15 of the cover part 11. The gas that has permeated through the ventilation film 2 flows through these ventilation paths AR ₂ and AR _3, and is discharged from the ventilation holes 13 h of the cover component 11 to the outside of the ventilation member 100 (outside of the casing 51).

  As shown in FIG. 5, when the ventilation region 2k of the ventilation membrane 2 is axially projected onto the ceiling portion 13 of the cover component 21, the projection surface (shaded portion in the drawing) of the ventilation region 2k is formed with the ventilation hole 13h of the cover component 11. There is no overlap. Further, the gas permeable membrane 2 cannot be viewed from directly above in the axial direction through the air holes 13h. According to such a positional relationship, even when a foreign matter such as a water droplet from the axial direction comes through the vent hole 13h, it is possible to prevent the foreign matter from directly attaching to the vent region 2k of the vent membrane 2. More preferably, as shown in FIG. 2, in the cross section parallel to the thickness direction of the gas permeable membrane 2 and including the central axis O (that is, the cross section in FIG. 2), the lower end on the inner peripheral side and the upper end on the outer peripheral side of the vent hole 13h. This is to prevent the straight line TF connecting the two from overlapping the ventilation region 2k of the ventilation membrane 2. In other words, an arbitrary straight line passing through the ventilation region 2k of the ventilation membrane 2 always passes through the cover component 11. If the positional relationship between the vent hole 13h of the cover part 11 and the vent film 2 is made in this way, even if a foreign substance that has come from an oblique direction passes through the vent hole 13h, the foreign substance enters the vent area 2k of the vent film 2. Direct adhesion can be prevented.

  As shown in the schematic diagram of FIG. 4, the ventilation region 2k of the gas permeable membrane 2 is a region 2k through which gas can actually pass in the gas permeable membrane 2, that is, a region facing the through hole 21h. . The region 2j other than the ventilation region 2k is a region supported (fixed) by the support body 21.

  In addition, as shown in FIG. 2, the ventilation member 100 of the present embodiment has the leg portions 25 a and 25 b of the support body 21 located inside the outer peripheral edge of the main body portion 23. When mounted, the main body 23 of the support 21 is seated on the casing 51 via the seal ring 7. When the ventilation member 100 is in an actual use state attached to the opening 52 of the casing 51, that is, when the ventilation structure 500 is configured, an appropriate gap SH is provided between the lower end of the side wall portion 15 and the casing 51. The length of the cover part 11 and the support 21 in the axial direction is adjusted so as to occur. According to such a gap SH, the air permeability inside and outside the cover part 11 can be further enhanced. However, since it is not good that the gap is too large, it is preferable that the width of the gap SH in the axial direction does not exceed the thickness of the seal ring 7.

  By the way, as shown to Fig.8 (a), the ventilation member 100 may be attached to the housing | casing 51 with the cover component 11 facing vertically downward. As shown in FIG. 8B, in the case of the ventilation member 300 that employs the cover component 61 that does not have the ventilation holes, if water enters the cover component 61, the water W may be collected as it is. On the other hand, according to the ventilation member 100 of the present invention, since the ventilation hole 13 is formed in the cover part 11, even if water enters the cover part 11, it can pass through due to gravity and inertial force due to acceleration / deceleration of the automobile. Water can be immediately discharged from the pores 13h. In addition, since a plurality of groove-shaped vent holes 13h are formed along the circumferential direction of the ceiling portion 13, even if the vent member 100 is randomly attached to the casing 51, three vent holes are provided. One of 13h is always located on the lower side in the vertical direction. That is, the attachment work to the housing 51 can be performed without worrying about the posture of the ventilation member 100.

  Further, as can be seen from FIG. 2 and FIG. 6, the vent hole 13h is formed along the boundary between the ceiling portion 13 and the side wall portion 15, so that the inner peripheral surface of the side wall portion 15 and the inner peripheral surface of the vent hole 13h. There is no step between. Therefore, water drops smoothly flow into the vent hole 13 h along the inner peripheral surface of the side wall portion 15 and are discharged to the outside of the cover part 11.

  It should be noted that the ventilation member 300 in FIG. 8B (which is the third embodiment of the present invention) is not particularly problematic. This is because the ventilation member 100 may be adopted when importance is attached to the drainage of the cover parts, and the ventilation member 300 may be adopted otherwise.

(Second embodiment)
FIG. 9 is a perspective view of the ventilation member of the second embodiment. FIG. 10 is a cross-sectional view of the ventilation structure formed by attaching the ventilation member of FIG. 9 to the housing. The same components as those in the first embodiment are denoted by the same reference numerals. The ventilation member 200 shown in FIG.9 and FIG.10 differs in the structure for improving the air permeability of the cover component 31 from the ventilation member 100 of 1st embodiment. There is no change in the gas permeable membrane 2 and the support 21. The point that the ventilation structure 600 is configured by the opening 52 of the casing 51 and the ventilation member 200 is also the same as in the first embodiment.

  As shown in FIGS. 9 and 10, the cover component 31 of the ventilation member 200 includes a substantially disk-shaped ceiling portion 33 that faces the ventilation membrane 2, and extends downward from the periphery of the ceiling portion 33 to surround the support 21. And a side wall portion 35 surrounding in the direction. The cover side engaging part 37 for fixing to the support body 21 is arrange | positioned on the inner surface of the ceiling part 33 similarly to 1st embodiment. The side wall portion 35 is formed with ventilation cutouts 35h at equal angular intervals at a plurality of locations in the circumferential direction for enhancing the air permeability inside and outside the cover part 31. The ventilation notch 35h is opened downward and has an upper end reaching the ceiling portion 33. By forming the ventilation notches 35h at a plurality of locations in the circumferential direction (three locations in the present embodiment), the side wall portion 35 is divided into a plurality of portions.

The ventilation notch 35 h communicates a gap (venting path AR ₂ ) formed between the ceiling portion 33 and the ventilation film 2 and the outside of the cover part 31. Therefore, there is a possibility that foreign matters such as water droplets may enter from the ventilation notch 35h and directly adhere to the ventilation film 2. Therefore, a partition wall that prevents the ventilation notch 35h from directly facing the ventilation film 2 is provided in the in-plane direction. In the ventilation member 200 of the present embodiment, the engagement portions 37 and 27 formed by the cover side engagement portion 37 and the support side engagement portion 27 are also used as a partition wall for the ventilation notch 35h.

  Specifically, as shown in the plan view of FIG. 11, the ventilation notch 35 h has a positional relationship corresponding to the cover side engaging portion 37 in the circumferential direction of the cover part 31. Further, the ventilation notch 35h is narrower than the cover side engaging portion 37 so that the ventilation film 2 cannot be directly viewed from the in-plane direction through the ventilation notch 35h. That is, all of the ventilation cutouts 35h are within an angle range connecting both ends of the cover side engaging portion 37 in the circumferential direction and the central axis O. In this way, if the ventilation notch 35h is hidden behind the cover side engaging portion 37, even if a foreign matter such as a water droplet comes from the in-plane direction, the foreign matter is directly applied to the ventilation membrane 2. Can be prevented. Moreover, according to the notch 35h for ventilation | gas_flowing, the effect of the drainage improvement as demonstrated in FIG. 8 can be anticipated.

  Instead of the ventilation cutout 35h or together with the ventilation cutout 35h, a ventilation hole penetrating the inside and outside of the side wall portion 35 may be provided. Specifically, a ventilation member 201 as shown in FIG. 12 can be proposed. The cover component 41 of the ventilation member 201 is formed by forming a circular ventilation hole 45 h in the side wall portion 45. The vent holes 45 h are formed at equiangular intervals at a plurality of locations along the circumferential direction of the side wall portion 45. Further, the point that the support side engaging portion 27 and the cover side engaging portion 37 are also used as a partition wall for the vent hole 45h is the same as the vent member 200 of FIG.

  In the second embodiment described above, the ventilation notch 35h or the ventilation hole 45h is formed in the side wall portions 35, 45 surrounding the support 21 in the circumferential direction. A vent hole may be formed in the ceiling portion as described in the first embodiment together with the vent hole 45h.

(Third embodiment)
FIG. 13 is a perspective view of the ventilation member of the third embodiment. FIG. 14 is a cross-sectional view of the ventilation structure formed by attaching the ventilation member of FIG. 13 to the housing. The same reference numerals are assigned to the same components as those in the first embodiment and the second embodiment. The ventilation member 300 shown in FIG.13 and FIG.14 is the same as the ventilation member of 1st embodiment and 2nd embodiment about the ventilation film 2 and the support body 21. FIG. The point which the ventilation structure 700 is comprised by the opening part 52 and the ventilation member 300 of the housing | casing 51 is the same as that of 1st embodiment and 2nd embodiment.

  As shown in FIGS. 13 and 14, the cover component 61 of the ventilation member 300 includes a substantially disk-shaped ceiling portion 63 that faces the ventilation membrane 2, and extends downward from the periphery of the ceiling portion 63 to surround the support 21. It is comprised from the side wall part 65 surrounding in the direction, and the cover side engaging part 67 engaged with the support body side engaging part 27 of the support body 21. As shown in FIG. However, neither the ventilation hole nor the ventilation notch is formed. A moderately wide gap SH is formed between the lower end of the side wall portion 65 and the casing 51, and the inside and outside of the cover component 61 are secured by this gap SH. According to the ventilation member 300 employing such a cover component 61, the gas permeable membrane 2 can be reliably protected, so that it is excellent in durability against foreign matters such as water and dust.

  As described above, examples of types of casings to which the ventilation members 100, 200, and 300 of the present invention can be applied include vehicles such as headlamps, rear lamps, fog lamps, turn lamps, back lamps, motor cases, pressure sensors, pressure switches, and ECUs. Electrical parts for use. Among them, the ventilation member 100, 200, 300 of the present invention is attached to the housing of an electrical component for a vehicle that is directly exposed to wind and rain, such as lamps and ECUs, or receives a water flow at the time of car washing, thereby forming a ventilation structure. High effects can be obtained.

The perspective view of the ventilation member of this invention. Sectional drawing of the ventilation structure of this invention. The disassembled perspective view of the ventilation member of FIG. The schematic diagram explaining the ventilation area | region of a ventilation film. FIG. 6 is a projection view for explaining the positional relationship between a vent hole formed in the cover part and a vent region of the vent film. The expansion perspective view of a cover component. The perspective view of the modification of a cover component. Action | operation explanatory drawing of a vent hole. The perspective view of 2nd embodiment of the ventilation member of this invention. Sectional drawing of the ventilation structure by the ventilation member of FIG. The top view which shows the positional relationship of the notch for ventilation | gas_flowing and a cover side engaging part. The perspective view of the modification of a cover component. The perspective view of 3rd embodiment of the ventilation member of this invention. Sectional drawing of the ventilation structure by the ventilation member of FIG. 1 is an overall schematic view of a ventilation structure of the present invention. Sectional drawing of the conventional ventilation member.

Explanation of symbols

2 Venting membrane 7 Seal ring (O-ring)
11, 11 ', 31, 41, 61 Cover parts 13, 33, 43, 63 Ceiling parts 13h, 14h, 45h Air holes 15, 35, 45, 65 Side wall parts 17, 37, 67 Cover side engaging part 21 Support 21h Through-hole 23 Body portion 25a, 25b Leg portion 27 Support side engaging portion 35h Ventilation cutout 51 Housing 52 Housing opening 100, 200, 201, 300 Ventilation member 500, 600, 700 Ventilation structure O Central axis SH, AR ₁ , AR ₂ , AR ₃ gap (ventilation path)

Claims (8)

A through-hole serving as a ventilation path inside and outside of the housing to be ventilated is formed, and a support body in which a ventilation film is arranged so as to block one opening of the through-hole, and the side from which the ventilation film is arranged, A cover part covering the support,
The direction parallel to the thickness direction of the gas permeable membrane is defined as the axial direction, the side where the opening is blocked by the gas permeable membrane in the axial direction is the upper side, and the side where the opening connected to the housing is located is the lower side. When defined
The cover component includes a ceiling portion facing the gas permeable membrane when the support body is arranged on the inner side and the relative positions thereof are fixed, and the gas permeable membrane is arranged from the periphery of the ceiling portion. A side wall portion extending in a lower axial direction than a position where the support body is circumferentially surrounded,
The ceiling part of the cover part is formed with a gap formed between the ceiling part and the ventilation film in the assembled state, and a ventilation hole communicating with the outside of the cover part,
The ventilation member, wherein the ventilation hole and the ventilation region of the ventilation membrane have a positional relationship that does not overlap in the axial direction. The cover component further includes a cover side engagement portion that is provided at a plurality of locations along the circumferential direction on the inner surface of at least one of the ceiling portion and the side wall portion and engages the support.
The ventilation member according to claim 1, wherein the ventilation hole is formed in the ceiling portion so as to be positioned between adjacent cover-side engagement portions. A through-hole serving as a ventilation path inside and outside of the housing to be ventilated is formed, and a support body in which a ventilation film is arranged so as to block one opening of the through-hole, and the side from which the ventilation film is arranged, A cover part covering the support,
A direction parallel to the thickness direction of the gas permeable membrane is defined as an axial direction, a direction perpendicular to the axial direction is defined as an in-plane direction, and the side where the opening is blocked by the gas permeable membrane in the axial direction is located on the upper side. When the side where the opening to be connected is defined as the lower side,
The cover component includes a ceiling portion facing the gas permeable membrane when the support body is arranged on the inner side and the relative positions thereof are fixed, and the gas permeable membrane is arranged from the periphery of the ceiling portion. A side wall portion extending in a lower axial direction than a position where the support body is circumferentially surrounded,
In the side wall portion, a gap formed between the ceiling portion and the ventilation film in the assembled state, and a vent hole or notch communicating with the outside of the cover part is formed,
A ventilation member, further comprising a partition wall that prevents the ventilation hole or notch from directly facing the ventilation film in the in-plane direction when the assembled state is achieved. The support body includes a main body portion in which a through-hole serving as a ventilation path inside and outside the housing is formed, and a ventilation film is disposed so as to block one opening of the through-hole, along the circumferential direction of the main body portion Including a support side engaging portion provided,
The cover component further includes a cover side engagement portion that is provided on at least one inner surface of the ceiling portion and the side wall portion and engages with the support side engagement portion of the support,
Engagement between the support-side engagement portion and the cover-side engagement portion is achieved by forming the vent or notch in a positional relationship corresponding to the cover-side engagement portion in the circumferential direction of the cover component. The ventilation member according to claim 3, wherein the portion is also used as the partition wall for the ventilation hole or notch. A ventilation structure comprising an opening of a housing to be ventilated and a ventilation member attached to the opening of the housing,
The ventilation member is
Connected to the main body portion having a through-hole serving as a ventilation path inside and outside of the housing, and a ventilation film disposed so as to block one opening of the through-hole, and the other opening side of the through-hole of the main body portion And a support that includes a leg that is inserted into an opening provided in the housing;
A cover part that covers the support from the opposite side of the leg,
The direction parallel to the thickness direction of the gas permeable membrane is the axial direction, the direction perpendicular to the axial direction is the in-plane direction, the side where the gas permeable membrane is located in the axial direction is the upper side, and the side where the leg is located is the lower side When defining
The support body has a configuration in which the main body portion projects outward in the in-plane direction in order to ensure the arrangement region of the gas permeable membrane around the through hole, and the leg portions are accommodated inside the projecting main body portion. And further including a support side engaging portion provided along the circumferential direction of the main body portion,
The cover component includes a ceiling portion facing the gas permeable membrane when the support body is arranged on the inner side and the relative positions thereof are fixed, and the gas permeable membrane is arranged from the periphery of the ceiling portion. The support body is provided on a side wall portion extending in a lower axial direction than a position where the main body portion of the support body is surrounded in a circumferential direction, and on an inner surface of at least one of the ceiling portion and the side wall portion. A cover-side engagement portion that engages with the support-side engagement portion.
The support and the cover component are in the assembled state when the support-side engaging portion and the cover-side engaging portion are engaged with each other, and between the ceiling portion and the ventilation film. A first gap that functions as a ventilation path is formed,
When the leg portion is inserted into the opening of the housing and the main body portion is in an actual use state where the body portion is seated directly or via another component, the lower end of the side wall portion in the cover component A second gap in which gas can flow between the housing and the housing, and the ventilation between the cover component and the support body is performed through the first gap and the second gap through the ventilation film. A ventilation structure characterized in that the relative length in the axial direction is adjusted.   In the ceiling part of the cover part, a vent hole that communicates the first gap and the outside of the cover part is formed at a position that does not overlap the ventilation region of the ventilation film in the axial direction. Item 6. The ventilation structure according to Item 5.   The cover side engagement portion is provided at a plurality of locations along the circumferential direction of the ceiling portion or the side wall portion, and the vent holes are adjacent to the cover side engagement along the circumferential direction of the ceiling portion. The ventilation structure according to claim 6, which is located between the parts.   Further comprising a rubber seal ring surrounding the leg portion on the lower surface side of the main body portion projecting outward in the in-plane direction, the lower end of the side wall portion of the cover component when in the assembled state, The cover component is positioned above the lower end of the seal ring that is in contact with the lower surface of the main body, so that the main body is in an actual use state in which the main body is seated via the seal ring. The ventilation structure according to any one of claims 5 to 7, wherein the second gap is formed between a lower end of the side wall portion and the housing.

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