JP4555217B2 - Ventilation member, ventilation casing and electrical component using the same - Google Patents

Description

  The present invention is fixed to a housing such as an electrical component, ensures ventilation between the inside and outside of the housing, and suppresses entry of foreign matter into the inside of the housing, and the ventilation member is fixed. The present invention relates to a ventilation casing and electrical parts.

  Conventionally, ventilation between the inside and outside of a housing has been ensured for vehicle electrical components such as lamps, pressure sensors, ECUs (Electrical Control Units), and electrical products such as mobile phones and cameras. The ventilation member which suppresses the penetration | invasion of the foreign material to the inside of is attached. By attaching such a ventilation member to the housing, pressure fluctuations inside the housing due to temperature changes can be reduced while preventing water and dust from entering the housing, and the inside and outside of the housing can be reduced. Sound can be transmitted between them and the gas generated inside the housing can be released to the outside.

An example of such a ventilation member is disclosed in Patent Document 1. As shown in FIG. 20, the ventilation member 101 disclosed in Patent Document 1 is fitted to the support body 103 so as to cover the ventilation film 102 and the cylindrical support body 103 in which the ventilation film 102 is disposed on the end surface. The bottomed protective cover 104 is provided. The ventilation member 101 is fixed to the housing 105 so as to cover the opening 106 of the housing 105. At this time, if the support body 103 having an inner diameter smaller than the outer diameter of the opening portion 106 is used, the ventilation member 101 can be fixed to the housing 105 using the elastic force generated by the support body 103 being stretched. In this publication, an elastomer is exemplified as the material of the support 103.
JP 2001-143524 A

  In order to prevent the ventilation member from coming off from the housing, that is, to improve the pullout strength, it is preferable that the elastic modulus of the support is large. However, when the elastic modulus becomes excessively large, the support cannot follow the unevenness present on the surface of the opening, and it becomes difficult to ensure the sealing property between the housing and the ventilation member. In order to improve the pull-out strength while maintaining the sealing performance of the ventilation member, it is necessary to increase the thickness of the support or to reduce the ratio of the inner diameter of the support to the outer diameter of the opening than before. Good.

  However, increasing the thickness of the support increases the size of the ventilation member, which may affect the packaging of the housing that fixes the ventilation member. In particular, it has a great influence on electrical components that require miniaturization. If the ratio of the inner diameter of the support to the outer diameter of the opening is reduced, the size as the ventilation member can be maintained, but the ventilation area of the ventilation film fixed to the end face of the support is reduced, which affects the ventilation characteristics. . In addition, since the amount of deformation of the support when fixed to the housing is increased, the gas permeable membrane supported by the support may be deformed.

  Therefore, the present invention includes a ventilation member that has both a pull-out strength and followability (sealability) by providing a support having an unprecedented structure, and a ventilation housing and an electrical component using the ventilation member. The purpose is to provide.

The ventilation member of the present invention includes a gas permeable membrane that allows gas passing through the opening to pass therethrough, a cylindrical support that supports the gas permeable membrane, and the gas permeable membrane. Includes protective cover . The support includes a first resin portion that is in contact with the housing in a state of being fixed to the opening, and a second material that is made of a material having a larger elastic modulus than a material that forms the first resin portion. Resin part. The first resin portion and the second resin portion are laminated in at least a part of the cross section of the support. The gas permeable membrane is disposed on an end surface of the support. The protective cover is supported by the support so that a space exists between the gas permeable membrane and the protective cover.

  The ventilation casing of the present invention has an opening to which the ventilation member is fixed, and the ventilation member is the ventilation member of the present invention.

  The electrical component of the present invention is an electrical component including a housing, and the ventilation member is fixed to the opening of the housing.

  According to the present invention, by providing a support including two or more resin materials having different elastic moduli, it is possible to achieve both the drawing strength and followability (sealability) of the ventilation member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same members are denoted by the same reference numerals, and redundant descriptions may be omitted.

  An example of the ventilation member of the present invention is shown in FIG. A ventilation member 1 shown in FIG. 1 includes a gas permeable membrane 3 and a cylindrical support 2 that supports the gas permeable membrane 3. The support body 2 is fixed to the opening 52 so as to cover the opening 52 of the housing 51. As shown in FIG. 2, the support 2 has a first resin part 4 that is in contact with the opening 52 of the housing 51 in a state of being fixed to the opening 52, and a material that constitutes the first resin part 4. And a second resin portion 5 made of a material having a large elastic modulus. The first resin portion 4 and the second resin portion 5 are laminated over the entire circumference of the cross section of the support 2. FIG. 2 is a cross-sectional view showing a cross section of the support 2 shown in FIG. 1, and the “cross section” is a surface obtained by cutting the support 2 along a plane perpendicular to its central axis.

  In the ventilation member 1, the first resin portion 4 made of the resin material A having a relatively low elastic modulus is disposed at the contact portion of the support 2 with the housing 51. For this reason, it is possible to suppress a decrease in the followability of the support 2 with respect to the surface (fixed surface) to which the ventilation member 1 is fixed in the casing 51, while ensuring the sealing performance of the ventilation member 1, Reduction in dustproofness can be suppressed. Further, in the ventilation member 1, the support 2 is configured using the resin material A and the resin material B having a relatively large elastic modulus. For this reason, compared with the case where a support body is comprised only using the resin material with a small elastic modulus, the elastic force of the support body 2 increases and it can ensure a drawing strength. By securing the pull-out strength, it is possible to suppress the dropout of the ventilation member from the housing. Thus, the drawing strength and the followability (sealability) are compatible without increasing the wall thickness of the support 2 or reducing the ratio of the inner diameter of the support 2 to the outer diameter of the opening 52. It can be a ventilation member. Moreover, in the ventilation member 1, since the deformation amount of the support body 2 at the time of fixing to the housing | casing 51 can be reduced, a deformation | transformation of the ventilation film 3 can be suppressed.

As for the elastic modulus of the material (resin material A) constituting the first resin part 4 and the elastic modulus of the material (resin material B) constituting the second resin part 5, the elastic modulus of the resin material A is a resin material. It is not particularly limited as long as it is smaller than the elastic modulus of B, and may be arbitrarily set according to the characteristics required for the support 2. For example, the elastic modulus of the resin material B may be a bending elastic modulus in a range of about 1 × 10 ⁸ N / m ² to 50 × 10 ⁸ N / m ² , and the bending elastic modulus of the resin material A is a resin. It may be in the range of about 5 to 80% of the bending elastic modulus of the material B.

  The resin material A is not particularly limited as long as the sealing property of the ventilation member 1 can be secured. For example, rubber or thermoplastic resin may be used. From the viewpoint of moldability, it is preferable to use a thermoplastic resin. For example, various thermoplastic elastomers such as olefin, styrene, urethane, ester, amide, and vinyl chloride, or polyolefin, polyamide, polyester Various thermoplastic resins such as polyacetal, polysulfone, polyacryl, polyphenylene sulfide, or a composite material thereof may be used. Among these, it is preferable to use a thermoplastic elastomer as the resin material A from the viewpoint of further ensuring the sealing performance. The resin material B is not particularly limited as long as the elastic modulus is larger than that of the resin material A, and the same material as the resin material A may be used.

  The structure of the support 2 is such that the first resin portion 4 is disposed so as to be in contact with the housing 51 (the opening 52 of the housing 51) in a state of being fixed to the opening 52, and has at least a cross section. As long as the first resin portion 4 and the second resin portion 5 are partially laminated, in other words, when the cross section of the support 2 is viewed, the first resin portion 4 and the second resin portion 5 There is no particular limitation as long as there is a portion where the resin portion 5 is disposed so as to overlap the radial direction of the support 2.

  For example, as shown in FIG. 2, a support body 2 in which a ring-shaped first resin portion 4 and a second resin portion 5 are laminated in a cross section may be used. Such a support body 2 has a structure in which the first resin portion 4 and the second resin portion 5 are laminated over the entire circumference of the cross section. Further, as shown in FIG. 3, the second resin part 5 having a shape (C-shaped) in which a part in the circumferential direction is cut off in the cross section, and a part (convex part) that fits into the lacked part. The support body 2 with which the 1st resin part 4 which has this was laminated | stacked may be sufficient. Such a support body 2 has a structure in which a first resin portion 4 and a second resin portion 5 are laminated in a part of the cross section. From the viewpoint of securing the pullout strength more stably, it is preferable that the first resin portion 4 and the second resin portion 5 are laminated over the entire circumference of the cross section.

  In a part of the cross section, a space may be formed between the first resin portion 4 and the second resin portion 5. For example, as shown in FIG. The support body 2 in which a space 12 is formed between the first resin portion 4 and the second resin portion 5 by a recess formed in a part of the peripheral surface may be used. Depending on the type of the resin material A and / or the resin material B, the balance between the drawing strength and the sealing performance as the ventilation member 1 can be controlled in more detail by forming the space 12. Such a space 12 may be formed by forming a concave portion and / or a convex portion on a part of the outer peripheral surface of the first resin portion 4 and / or the inner peripheral surface of the second resin portion 5. The support 2 shown in FIG. 4 has a structure in which a first resin portion 4 and a second resin portion 5 are laminated in a part of the cross section.

  The support 2 does not have to satisfy the above-described conditions in all of its cross sections. The support 2 in the ventilation member 1 shown in FIG. 5 satisfies the above-described conditions only in the cross section BB ′ among the cross sections AA ′, BB ′, and CC ′. Even with such a support 2, it is possible to achieve both the drawing strength and the sealing performance.

  In the support body 2 shown in FIGS. 1 to 5, the first resin portion 4 and the second resin portion 5 are laminated one by one, but the first resin portion 4 and the second resin portion 5 are laminated. The number of stacked layers is not particularly limited. Moreover, the support body 2 may include a resin portion other than the first resin portion 4 and the second resin portion 5, and as shown in FIG. 4. The support body 2 in which the second resin portion 5 and the third resin portion 6 are sequentially laminated may be used. At this time, for example, by making the material constituting the third resin portion 6 the same as the material constituting the first resin portion 4, the elastic modulus of the material constituting the third resin portion 6 is If the elastic modulus of the material constituting the second resin portion 5 is made smaller than that, the protective cover described later can be more reliably arranged. A resin part other than the first resin part 4 and the second resin part 5 may be interposed between the resin parts 4 and 5.

  The shape of the support 2 is not particularly limited as long as it is cylindrical, and may be cylindrical as shown in FIG. 1 or may be elliptical or rectangular. The shape of the outer periphery may be different from the shape of the inner periphery, and as shown in FIG. 7, the support 2 may have a cylindrical outer periphery and a rectangular tube inner periphery. The support body 2 shown in FIG. 7 can be fixed to the square cylindrical opening 52.

  As shown in FIG. 8 and FIG. 9, the support body 2 having the convex portion 7 formed on the outer periphery thereof may be used. For example, a protective cover described later can be supported by the convex portion 7. The convex part 7 may be formed in the 2nd resin part 5 as shown in FIG. 8, and may be formed in the 3rd resin part 6 as shown in FIG. When the convex part 7 is formed on the third resin part 6, for example, by making the material constituting the third resin part 6 the same as the material constituting the first resin part 4, It is preferable that the elastic modulus of the material constituting the third resin portion 6 is smaller than the elastic modulus of the material constituting the second resin portion 5. The shape and number of the convex portions 7 are not particularly limited.

  The size of the support 2 is not particularly limited, and may be arbitrarily set according to characteristics required for the ventilation member 1.

  The method for fixing the ventilation member 1 to the opening 52 is not particularly limited. The ventilation member 1 may be fixed so as to cover the opening 52, or may be inserted into the opening 52 to fix the ventilation member 1. When the ventilation member 1 is fixed so as to cover the opening 52, a support 2 in which the first resin portion 4 is disposed on the inner layer as shown in FIG. 2 may be used. The ventilation member 1 using such a support body 2 can be fixed to the housing 51 so as to cover the opening 52 as shown in FIG. At this time, the inner diameter of the support 2 is preferably slightly smaller than the outer diameter of the opening 52.

  When the ventilation member 1 is fixed by being inserted into the opening 52, a support 2 in which the first resin portion 4 is disposed on the outer layer may be used as shown in FIG. The ventilation member 1 using such a support 2 can be inserted into the opening 52 and fixed to the housing 51 as shown in FIG. At this time, it is preferable that the outer diameter of the support 2 is slightly larger than the inner diameter of the opening 52.

  The manufacturing method of the support body 2 is not specifically limited, For example, it can manufacture using methods, such as injection molding and tube extrusion molding. In the injection molding method, a laminated body in which resin portions having different elastic moduli are combined can be formed by integral molding, two-color molding (or multicolor molding), or double molding (or multiple molding). In the case of using integral molding, for example, the resin portion that becomes the inner layer may be formed first, the molded resin portion may be filled in the mold, and then the resin portion that becomes the outer layer may be formed.

  In the tube extrusion molding method, the support 2 can be produced by cutting a multi-layer tube formed by double extrusion (or multi-layer extrusion) and made of resin portions having different elastic moduli to a predetermined length.

  Further, for example, the support body 2 may be manufactured by laminating the first resin portion 4 and the second resin portion 5 which are separately molded. Specifically, for example, a resin portion that becomes an inner layer may be inserted into a resin portion that becomes an outer layer. At this time, the deformation of the produced support 2 can be suppressed by making the outer diameter of the resin part to be the inner layer slightly larger than the inner diameter of the resin part to be the outer layer.

  The material, structure, etc. of the gas permeable membrane 3 are not particularly limited as long as the amount of gas permeation can be secured. For example, the gas permeable membrane 3 including a woven fabric, a non-woven fabric, a net, a porous body, or a foam may be used. Among these, from the viewpoint of water repellency (waterproofness), heat resistance, chemical resistance, and the like, the gas permeable membrane 3 including a fluororesin porous body is preferable. Examples of the fluororesin include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkylvinyl copolymer, tetrafluoroethylene-ethylene copolymer. A polymer, polyvinylidene fluoride (PVdF), or the like may be used. In particular, it is preferable to use an expanded PTFE porous body that can maintain air permeability with a small area and has a high function of suppressing entry of foreign matters such as water and dust into the housing. In the case of using a fluororesin porous body for the gas permeable membrane 3, the average pore diameter of the porous body is preferably in the range of about 0.01 μm to 10 μm from the viewpoint of waterproofness. Such a porous body can be obtained by a general porous body forming method such as a stretching method or an extraction method.

  A reinforcing layer may be laminated on the gas permeable membrane 3. The material and structure of the reinforcing layer are not particularly limited, but a reinforcing layer that has better air permeability than the gas permeable membrane 3 is preferable. For the reinforcing layer, for example, a woven fabric, a nonwoven fabric, a mesh, a net, a sponge, a foam, a porous body, or the like may be used. Resin or metal may be used as the material of the reinforcing layer, and any material may be selected according to necessary characteristics. The reinforcing layer may be simply overlapped with the gas permeable membrane 3 or may be joined to each other. Bonding may be performed using a technique such as adhesive lamination, thermal lamination, heat welding, ultrasonic welding, or the like. The number of reinforcing layers laminated on the gas permeable membrane 3 is not particularly limited.

  The gas permeable film 3 may be subjected to liquid repellency treatment such as water repellency treatment and oil repellency treatment. The liquid repellent treatment may be performed by, for example, applying a substance having a small surface tension to the gas permeable membrane 3 and curing it after drying. The liquid repellent used for the liquid repellent treatment is not particularly limited as long as a film having a surface tension smaller than the surface tension of the gas permeable film can be formed on the surface of the gas permeable film. For example, a solution containing a polymer material having a perfluoroalkyl group May be used. The liquid repellent agent may be applied to the gas permeable membrane 3 by using an impregnation method or a spray method.

  The air permeability of the gas permeable membrane 3 may be arbitrarily set according to the characteristics required for the gas permeable member 1. In particular, the Gurley number is preferably 1000 seconds or less, and more preferably 100 seconds or less. The lower limit of the Gurley number is not particularly limited, and may be 0.05 seconds or longer, for example. The Gurley number may be obtained based on the provisions of JIS P 8117 (1998), and may be obtained by converting from the fragile air permeability obtained based on the provisions of JIS L 1096 (1999) as necessary.

  The position where the gas permeable membrane 3 is disposed on the support 2 is not particularly limited. If the gas permeable membrane 3 is disposed on the end face of the support 2, the manufacture becomes easy.

  The gas permeable membrane 3 may be fixed to the support portion 2 using a technique such as heat welding, ultrasonic welding, or adhesion using an adhesive. From the viewpoint of simplicity, it is preferable to use heat welding or ultrasonic welding. When a reinforcing layer is laminated on the gas permeable membrane 3, the reinforcing layer and the support 2 may be fixed to suppress damage to the gas permeable membrane 3 at the time of fixing. When the air permeable film 3 needs to have high liquid repellency, the air permeable film 3 is fixed so that the surface having a large liquid repellency faces the outside of the housing when the air permeable member 1 is fixed to the housing 51. do it.

  Further, when the support 2 is formed, it may be formed integrally with the gas permeable membrane 3.

  Another example of the ventilation member 1 of the present invention is shown in FIG. The ventilation member 1 shown in FIG. 13 further includes a bottomed protective cover 8 that covers the ventilation film 3. The protection cover 8 has a space between the ventilation film 3 and the protection cover 8, and the ventilation path 11. Is supported by the support body 2 so as to be secured. The protective cover 8 makes it difficult for foreign matter such as stepping stones, dust, and water to come into contact with the gas permeable membrane 3, so that the gas permeable membrane 3 can be prevented from being damaged.

  The method for supporting the protective cover 8 is not particularly limited. In the ventilation member 1 shown in FIG. 13, a convex portion 9 is formed on the inner periphery of the protective cover 8, and the protective cover 8 is fixed to the support body 2 by contacting the convex portion 9 and the support body 2. . At this time, the elastic modulus of the material constituting the resin part (resin part supporting the protective cover 8) in contact with the convex portion 9 in the support 2 is smaller than the elastic modulus of the material constituting the second resin part 5. It is preferable. The protective cover 8 can be fixed more reliably. An example of the protective cover 8 in which the convex part 9 was formed in the inner periphery is shown in FIG.

  In the ventilation member 1 shown in FIG. 15, the protective cover 8 is supported and fixed by the convex portion 7 formed on the outer periphery of the support 2. At this time, as described above, the elastic modulus of the material constituting the resin portion (resin portion supporting the protective cover 8) on which the convex portion 7 is formed is greater than the elastic modulus of the material constituting the second resin portion 5. Is preferably small.

  As described above, a convex portion can be formed on the inner periphery of the protective cover 8 and / or the outer periphery of the support 2 to fix the protective cover 8. However, in order to more securely fix the protective cover 8, two or more More preferably, three or more protrusions are formed on the inner periphery of the protective cover 8 and / or the outer periphery of the support 2.

  As shown in FIGS. 14 and 16, the abutting portion 10 may be formed on the inner surface of the bottom portion of the protective cover 8. The position of the protective cover 8 can be determined by the abutting portion 10, and the ventilation path 11 can be more reliably ensured. The number and shape of the abutting portions 10 are not particularly limited, but it is preferable that two or more, more preferably three or more abutting portions 10 are formed in order to ensure the ventilation path 11 more reliably.

  The support member in which the ventilation member 1 has a bottomed protective cover 8 that covers the ventilation film 3 and a space 12 formed between the first resin part 4 and the second resin part 5 as shown in FIG. 2, the space 12 can be used as a ventilation path depending on the shape of the space 12. An example of such a ventilation member is shown in FIG. In the ventilation member 1 shown in FIG. 17, a space 12 penetrating from one end surface of the support 2 to the other end surface is formed in the support 2, and the space 12 is a part of the ventilation path 11 in the ventilation member 1. It is composed. In such a ventilation member 1, depending on the ventilation area of the space 12, the outer peripheral surface of the support 2 and the inner peripheral surface of the protective cover 8 can be in close contact with each other. In this case, the protective cover 8 in use. Can be prevented from falling off.

  Another example of the ventilation member 1 of the present invention is shown in FIG. The ventilation member 1 shown in FIG. 18 has a support 2 in which a space 12 penetrating from one end surface of the support 2 to the other end surface is formed between the first resin portion 4 and the second resin portion 5. It has. Further, the ventilation member 1 includes a protective cover 8 integrated with the second resin portion 5. In such a ventilation member 1, the space 12 can be a part of the ventilation path 11, and the first resin portion 4 and the protective cover 8 are integrated. Besides being able to suppress dropout, further downsizing is possible.

  The shape of the protective cover 8 is not particularly limited, and a through hole may be formed at the bottom of the protective cover 8 as long as foreign substances are difficult to contact the gas permeable membrane 3. When the through hole is formed, the air permeability can be improved. A protective layer made of a woven fabric, a nonwoven fabric, a net, or the like may be disposed at the opening of the through hole. In this case, the air permeability is improved and the possibility of foreign matter contact with the gas permeable membrane 3 is further increased. Can be reduced. The presence or absence of the through hole in the protective cover 8 may be arbitrarily set according to the environment in which the ventilation member 1 is used. Depending on the environment, it is preferable to use the protective cover 8 in which no through hole is formed. The protective cover 8 may be formed using, for example, resin or metal.

  Next, the ventilation casing and the electrical component of the present invention will be described.

  The ventilation casing and electrical component of the present invention are characterized in that the ventilation member 1 of the present invention is fixed to an opening of the casing. As described above, in the ventilation member 1 according to the present invention, by providing the support including two or more resin materials having different elastic moduli, it is possible to achieve both the drawing strength and the followability (sealability). For this reason, for example, it is possible to reduce the size and / or improve the ventilation characteristics as compared with a ventilation member in which the thickness of the support is increased or the ratio of the inner diameter of the support to the outer diameter of the opening is reduced. is there. Therefore, the ventilation casing and the electrical component of the present invention can be, for example, a ventilation casing and an electrical component in which the degree of freedom in packaging is improved while ensuring the ventilation characteristics of the ventilation member.

  There are no particular limitations on the type of ventilation casing and electrical component to which the ventilation member of the present invention is fixed. For example, electrical components such as headlamps, rear lamps, fog lamps, turn lamps, back lamps, motor cases, pressure sensors, pressure switches, ECUs, and housings for electrical products such as mobile phones, cameras, electric razors, electric toothbrushes, lamps, etc. Etc. The number of ventilation members fixed to the housing is not particularly limited, and two or more ventilation members may be fixed to two or more surfaces or the same surface of the housing.

  FIG. 19A and FIG. 19B show an example of the ventilation casing (electrical component) of the present invention. As shown in FIG. 19B, the ECU 61 shown in FIG. 19A has the ventilation member 1 of the present invention fixed to the opening of one member 62 constituting the casing.

  Hereinafter, the present invention will be described more specifically with reference to examples. The present invention is not limited to the examples shown below.

  In the present example, the cylindrical support shown in FIG. 2 was molded, and a gas permeable membrane was fixed to the end face of the molded support to produce the ventilation member shown in FIGS. Thereafter, the pullout strength and sealability of the produced ventilation member were evaluated. First, each evaluation method is shown.

-Evaluation method of pullout strength-
First, a polypropylene cylinder (outer diameter: 8 mm) was inserted into the support of the produced ventilation member until the insertion depth reached 8 mm. Thereafter, using a tensile tester, the cylindrical body was pulled out from the support (drawing speed: 50 mm / min), and the maximum value of the force generated at that time was taken as the pulling strength.

-Evaluation method of sealability-
Evaluation of the sealing performance of the ventilation member was performed using a shower test. Specifically, after fixing the produced ventilation member so as to cover the opening (outer diameter: 8 mm, inner diameter: 5 mm, height: 10 mm) of the housing (internal volume: 500 cm ³ ), 1 liter of water is added. It sprayed for 5 minutes with the amount of water every minute, and the presence or absence of the penetration | invasion of the water to the inside of a housing | casing was confirmed.

  Next, a method for manufacturing each sample used in this example is described.

-Sample 1-
First, the cylindrical first resin portion was molded by an injection molding method using a thermoplastic elastomer (Mitsui Chemicals Co., Ltd .: Miralastomer 6030, flexural modulus: 4.4 × 10 ⁸ N / m ² ). Next, the molded first resin part is filled in a mold, and high-density polyethylene (manufactured by Chisso Corporation: J110K, flexural modulus: 9.8 × 10 ⁸ N / m ² ) is used. A cylindrical second resin portion was molded so as to be in contact with the outer peripheral portion, and the support shown in FIG. 2 was obtained. The inner diameter of the obtained support is 7.5 mm, the length in the central axis direction of the support is 12 mm, and the thickness is 2.5 mm (the thickness of the first resin part: 1 mm, the thickness of the second resin part) : 1.5 mm). The flexural modulus is a value measured based on the provisions of ASTM (American Society for Testing and Materials) D 790.

Next, as a gas permeable membrane, a membrane made of a polytetrafluoroethylene (PTFE) porous body (thickness: 25 μm, average pore diameter: 0.6 μm, porosity: 85%), and a nonwoven fabric (thickness: 130 μm) as a reinforcing layer ) (A cylindrical shape with an outer diameter of 14 mm, manufactured by Nitto Denko Corporation: Microtex NTF1026-K02) was fixed to the end face of the support by thermal fusion to produce a ventilation member shown in FIG. At the time of fixing, the reinforcing layer and the support were in contact with each other, and held at 190 ° C. with a pressure of 9.8 × 10 ⁴ Pa for 10 seconds.

-Sample 2-
A ventilation member was prepared in the same manner as Sample 1. However, a gas permeable film subjected to a liquid repellent treatment was used as the gas permeable film.

  The liquid repellent treatment was performed as follows. First, a copolymer composed of 40 mol% alkyl methacrylate and 60 mol% perfluoroalkyl methacrylate is dissolved in a solvent in which 100 parts by weight of toluene, 39 parts by weight of n-heptane, and 3.5 parts by weight of methyl acetate are uniformly mixed. Treatment solution (copolymer concentration: 5% by weight) was prepared. Next, the PTFE porous body in the gas permeable membrane similar to Sample 1 was immersed in the prepared treatment solution and dried at 120 ° C. for 3 minutes to perform a liquid repellent treatment. When kerosene was dropped onto the treated surface of the gas permeable membrane that had been subjected to the liquid repellent treatment, no penetration of kerosene into the gas permeable membrane was observed.

-Sample 3-
A protective cover shown in FIG. 14 was placed on the same ventilation member as that of sample 1, and a ventilation member shown in FIG. 13 was produced. Protective cover (bottom cylindrical shape, inner diameter: 16 mm, outer diameter: 18 mm, length in the central axis direction: 10 mm, three convex portions are formed on the inner peripheral portion, inner diameter connecting the tops of the convex portions: 11.5 mm) Polypropylene (Ube Industries, Ltd .: UBE Polypro J815HK) was used for injection molding. The ventilation member similar to the sample 1 was inserted into the protective cover formed in this way from the end surface where the ventilation film was arranged, and the ventilation member shown in FIG. 13 was produced.

-Sample A (conventional example)-
A support having the same size as that of Sample 1 was molded by an injection molding method using only a thermoplastic elastomer (Mitsui Chemical Co., Ltd .: Miralastomer 6030, flexural modulus: 4.4 × 10 ⁸ N / m ² ). A gas permeable membrane similar to that of Sample 1 was fixed to the end surface of the molded support by heat-sealing to produce a gas permeable member.

  The samples 1 to 3 and the sample A thus produced were evaluated for pullout strength and sealability. The results are shown in Table 1 below.

  As shown in Table 1, the pull-out strengths of Samples 1 to 3 were improved while maintaining the sealing performance as compared with Sample A having a support made of only a thermoplastic elastomer.

  The present invention can be applied to other embodiments without departing from the spirit and essential characteristics thereof. The embodiments disclosed in this specification are illustrative in all respects and are not limited thereto. The scope of the present invention is shown not by the above description but by the appended claims, and all modifications that fall within the meaning and scope equivalent to the claims are embraced therein.

  According to the present invention, by providing a support including two or more resin materials having different elastic moduli, a ventilation member capable of achieving both drawing strength and followability (sealability), and ventilation using the ventilation member. A housing and electrical components can be provided.

  The ventilation member of the present invention can be used for various housings without any particular limitation. As the ventilation housing and electrical parts using the ventilation member of the present invention, for example, headlamps, rear lamps, fog lamps, turn lamps, back lamps, motor cases, pressure sensors, pressure switches, ECUs and other electrical parts, mobile phones, Products such as cameras, electric razors, electric toothbrushes, and lamps.

It is a perspective view which shows typically an example of the ventilation member of this invention. It is sectional drawing which shows typically the cross section of the support body in the ventilation member shown in FIG. It is sectional drawing which shows typically an example of the support body in the ventilation member of this invention. It is sectional drawing which shows typically another example of the support body in the ventilation member of this invention. It is sectional drawing which shows another example of the ventilation member of this invention typically. It is sectional drawing which shows typically another example of the support body in the ventilation member of this invention. It is sectional drawing which shows typically another example of the support body in the ventilation member of this invention typically. It is sectional drawing which shows typically an example different from the above of the support body in the ventilation member of this invention. It is sectional drawing which shows typically an example different from the above of the support body in the ventilation member of this invention. It is sectional drawing which shows typically the perpendicular | vertical surface of the ventilation member shown in FIG. It is sectional drawing which shows typically an example different from the above of the support body in the ventilation member of this invention. It is sectional drawing which shows typically another example of the ventilation member of this invention. It is sectional drawing which shows typically another example of the ventilation member of this invention typically. It is a perspective view which shows the protective cover in the ventilation member shown in FIG. It is sectional drawing which shows typically an example different from the above of the ventilation member of this invention. It is a perspective view which shows the protective cover in the ventilation member shown in FIG. It is sectional drawing which shows typically an example different from the above of the ventilation member of this invention. It is sectional drawing which shows typically an example different from the above of the ventilation member of this invention. It is a perspective view which shows an example of the ventilation | gas_flowing housing | casing of this invention. It is a top view which shows the inner surface of one member which comprises the ventilation | gas_flowing housing | casing shown to FIG. 19A. It is sectional drawing which shows an example of the conventional ventilation member typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ventilation member 2 Support body 3 Ventilation film 4 1st resin part 5 2nd resin part 6 3rd resin part 7 Convex part 8 Protective cover 9 Convex part 10 Abutting part 11 Ventilation path 12 Space 51 Case 52 Opening Part 61 ECU
62 member 101 ventilation member 102 ventilation membrane 103 support body 104 protective cover 105 housing 106 opening

Claims (11)

A gas permeable membrane that allows gas passing through the opening to pass through in a state of being fixed to the opening of the housing, a cylindrical support that supports the gas permeable membrane, and a protective cover that covers the gas permeable membrane ,
A first resin part in contact with the housing in a state in which the support is fixed to the opening; and a second material made of a material having a larger elastic modulus than a material constituting the first resin part. Including a resin part,
In at least a part of the cross section of the support, the first resin portion and the second resin portion are laminated ,
The gas permeable membrane is disposed on an end surface of the support;
A ventilation member that is supported by the support so that the protective cover has a space between the ventilation membrane and the protective cover .   The ventilation member according to claim 1, wherein the first resin portion and the second resin portion are laminated over the entire circumference of the transverse section. The ventilation member according to claim 1 , wherein the protective cover is supported by a convex portion formed on an outer peripheral surface of the support. The support further includes a third resin portion that supports the protective cover;
The third elastic modulus of the material of the resin portion, the ventilation member according to a small claim 1 than the elastic modulus of the material constituting the second resin part. The ventilation member according to claim 4 , wherein the materials constituting the first resin portion and the third resin portion are the same.   The ventilation member according to claim 1, wherein the ventilation film includes a porous body of a fluororesin. The ventilation member according to claim 6 , wherein the fluororesin is polytetrafluoroethylene.   The ventilation member according to claim 1, wherein the ventilation film is subjected to a liquid repellent treatment.   The ventilation member according to claim 1, wherein an air permeability of the gas permeable membrane is 1000 seconds or less in terms of Gurley number. Having an opening to which the ventilation member is fixed;
The ventilation housing | casing which the said ventilation member is a ventilation member of Claim 1. An electrical component comprising a housing,
The electrical component by which the ventilation member of Claim 1 is being fixed to the opening part of the said housing | casing.

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