JP2010062094A - Venting member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilating member having a ventilating film difficult to transform when it is mounted to a casing, and having excellent resistance to environments such as chemical resistance. <P>SOLUTION: This ventilating member 10 is equipped with a first metal body 4, the ventilating film 2, and a second metal body 6. The metal body 4 has a hollow barrel part 4b, and a flat part 4a in which a first through-hole 4h is formed. The second metal body 6 has a second through-hole separated from the first through-hole 4h of the first metal body 4 by the ventilating film 2. A gap between the ventilating film 2 and the flat part 4a and a gap between the ventilating film 2 and the second metal body 6 are sealed by pressing the ventilating film 2 onto the flat part 4a of the first metal body, and the second metal body 6 is press-fitted in the barrel part 4b of the first metal body 4 so that ventilation through the ventilating film 2 and the second through hole 6h becomes possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ventilation member.

  The housing that houses the electrical components of automobiles such as lamps, motors, sensors, switches, ECUs, etc. prevents the occurrence of problems due to pressure changes by ensuring ventilation between the inside and outside of the housing, and the housing. A ventilation member for preventing foreign substances from entering the body is attached. An example of such a ventilation member is disclosed in Patent Document 1. The ventilation member disclosed in Patent Document 1 is shown in FIGS. 10A and 10B.

  The ventilation member 60 includes a ventilation film 63, a support body 62 on which the ventilation film 63 is welded, and a cover 61 that covers the support body 62. The support body 62 is made of a thermoplastic elastomer, and the ventilation member 60 is fixed to the nozzle 50a of the housing 50 using the elasticity of the thermoplastic elastomer. The ventilation member 60 can be attached to the housing 50 with one touch, and is excellent in workability. However, when the ventilation member 60 is attached to the housing 50, there is a problem that the ventilation film 63 is deformed along with the elastic deformation of the support body 62.

In recent years, automobiles have become highly electronically controlled, and electrical components such as ECUs are installed not only in the car but also in the engine room. For this reason, the requirements for environmental resistance such as heat resistance and chemical resistance for the ventilation member are stricter than before. According to the ventilation member 60 shown in FIGS. 10A and 10B, the ventilation film 63 needs to be welded or bonded to the support body 62. Therefore, it is essential to consider the compatibility between the material of the ventilation film 63 and the material of the support body 62. It is. That is, the room for selecting the material of the support 62 is narrow, which prevents improvement in environmental resistance.
JP 2001-143524 A

  In view of the above circumstances, an object of the present invention is to provide a ventilation member in which a ventilation film is not easily deformed when attached to a housing or the like and is excellent in environmental resistance such as chemical resistance.

That is, the present invention
A first metal body having a hollow body part and a flat part located at one end of the body part and formed with a first through hole for ventilation;
A gas permeable membrane disposed on the flat portion so as to close the first through hole from the side of the body portion;
A second through hole overlapping the first through hole of the first metal body with respect to a thickness direction of the gas permeable film, and pressing the gas permeable film against the flat portion of the first metal body The first gap is sealed so that the gap between the membrane and the flat portion and the gap between the gas permeable membrane and itself can be sealed, and air can be vented through the first through hole, the gas permeable membrane, and the second through hole. A second metal body press-fitted into the body of the metal body;
A ventilation member is provided.

  According to the ventilation member of the present invention, the ventilation film is held between the first metal body and the second metal body. Since the rigidity of each metal body is higher than that of a conventional resin support, it is possible to prevent the ventilation film from being deformed when the ventilation member is attached to a housing or the like. Further, since the gap is sealed by sandwiching the gas permeable film between the first metal body and the second metal body, welding or adhesion between the metal body and the gas permeable film is essentially unnecessary. Therefore, it is possible to eliminate the problem of peeling due to welding or adhesion failure and aging deterioration. In addition, since the first metal body and the second metal body are excellent in environmental resistance such as chemical resistance as compared with a conventional resin support, the ventilation member of the present invention is used in a severe environment such as an engine room. Also suitable for use in.

  Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
As shown in FIGS. 1 and 2, the ventilation member 10 of the present embodiment includes a first metal body 4, a ventilation film 2 and a second metal body 6. When the second metal body 6 is press-fitted into the first metal body 4, the gas permeable membrane 2 is held between the first metal body 4 and the second metal body 6. The first metal body 4 and the second metal body 6 serve as a support for supporting the gas permeable membrane 2.

  The 1st metal body 4 has the hollow trunk | drum 4b and the flat part 4a located in the end of the trunk | drum 4b. The trunk 4b has a cylindrical shape and extends to a position where a sufficiently large space SH is formed behind the second metal body 6. A first through hole 4h for ventilation is formed in the center of the flat portion 4a.

  The second metal body 6 has a disc shape. A second through hole 6 h is formed at the center of the second metal body 6. The gas permeable membrane 2 is pressed against the flat portion 4 h of the first metal body 4 by the second metal body 6. Thereby, the clearance gap between the ventilation film 2 and the flat part 4a and the clearance gap between the ventilation film 2 and the 2nd metal body 6 are sealed. As a result, ventilation through the first through hole 4h, the gas permeable membrane 2 and the second through hole 6h is possible.

The outer peripheral portion of the second metal body 6 is in contact with the body portion 4b of the first metal body 4 over the entire circumferential direction. The inner diameter of the body portion 4 b of the first metal body 4 and the outer diameter of the second metal body 6 are the same. Therefore, a uniform holding force can be imparted to the gas permeable membrane 2 in the plane. In the present embodiment, equal to the diameter D ₂ of the second through-hole 6h and the diameter D ₁ of the first through-hole 4h is, the first through hole 4h, the second through hole 6h and the centers the same axis of the breathable film 2 O is on. However, the diameter D ₂ may be different from the diameter D _1, and the first through hole 4h, the second through hole 6h, and the gas permeable membrane 2 may not be arranged coaxially.

  In the present invention, the gas permeable membrane 2 does not need to be bonded or welded to the first metal body 4 and / or the second metal body 6. However, when there is a need for temporary fastening, the outer peripheral portion of the gas permeable membrane 2 may be bonded to the first metal body 4 or the second metal body 6.

  As the material of the first metal body 4 and the second metal body 6, general-purpose metals such as stainless steel, cast iron, carbon steel, and aluminum can be used. It is desirable to use a material that has been surface-treated or a material that is difficult to oxidize in order to prevent oxidation. Each metal body can be produced by a general processing / forming method such as pressing, cutting, drawing, and die casting. In order to prevent the gas permeable membrane 2 from being damaged from the metal bodies 4 and 6, as shown in FIG. 3, chamfers and fillets 4f and 6f are formed at the opening edges of the through holes 4h and 6h of the metal bodies 4 and 6. May be.

  The gas permeable membrane 2 is disposed on the flat portion 4a so as to close the first through hole 4h from the side where the body portion 4b is located (inside the first metal body 4). The ventilation film 2 separates the through hole 4 h of the first metal body 4 from the through hole 6 h of the second metal body 6. In the present embodiment, the outer diameter of the gas permeable membrane 2 and the outer diameter of the second metal body 6 are the same. Therefore, the positioning of the gas permeable membrane 2 with respect to the first metal body 4 is simple, and the gas permeable membrane 2 is unlikely to move or twist when the second metal body 6 is press-fitted into the first metal body 4.

  The gas permeable membrane 2 is not particularly limited as long as it has a property of allowing gas permeation and preventing liquid permeation. As shown in FIG. 4, in the present embodiment, the gas permeable membrane 2 includes a membrane body 2 a and a reinforcing material 2 b superimposed on the membrane body 2 a. By providing the reinforcing material 2b, the strength of the gas permeable membrane 2 is improved.

  The film body 2a may be subjected to oil repellent treatment or water repellent treatment. These liquid repellent treatments can be performed by applying a substance having a small surface tension to the film body 2a, and curing after drying. The liquid repellent used for the liquid repellent treatment is not particularly limited as long as it can form a film having a surface tension lower than that of the film body 2a. For example, a liquid repellent containing a polymer having a perfluoroalkyl group is suitable. The liquid repellent is applied to the film body 2a by a known method such as impregnation or spraying.

  A typical example of the membrane body 2a is a porous membrane made of fluororesin or polyolefin. From the viewpoint of ensuring sufficient waterproofness, a resin porous membrane having an average pore diameter of 0.01 to 10 μm is preferably used for the membrane body 2a.

  Examples of the fluororesin suitable for the membrane body 2a include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, and tetrafluoroethylene-ethylene copolymer. Examples of suitable polyolefin for the membrane body 2a include polymers or copolymers of monomers such as ethylene, propylene, 4-methylpentene-1,1butene. A nanofiber film porous body using polyacrylonitrile, nylon, or polylactic acid may be used. Among them, PTFE is preferable because it has a small area and can ensure high air permeability and is excellent in ability to prevent foreign matter from entering the inside of the housing. The PTFE porous membrane can be produced by a known molding method such as a stretching method or an extraction method.

  The reinforcing material 2b can be a member made of a resin such as polyester, polyethylene, or aramid. The form of the reinforcing material 2b is not particularly limited as long as the air permeability of the gas permeable membrane 2 can be maintained, and is, for example, a woven fabric, a nonwoven fabric, a net, a mesh, a sponge, a foam, or a porous body. The membrane body 2a and the reinforcing material 2b are preferably bonded together by thermal lamination, thermal welding, ultrasonic welding, or an adhesive.

The thickness of the gas permeable membrane 2 is preferably in a range of 1 μm to 5 mm in consideration of strength and ease of handling. Air permeability of the breathable film 2 may be in the range of 0.1~300sec / 100cm ³ at Gurley value obtained in Gurley tester method specified in JIS P 8117. The water pressure resistance of the gas permeable membrane 2 is preferably 1.0 kPa or more.

(Second Embodiment)
As shown in FIG. 5, the ventilation member 20 of the present embodiment includes a first metal body 14, a ventilation film 2, a second metal body 6, and a rubber part 16. The gas permeable membrane 2 and the second metal body 6 are the same as those described in the first embodiment. The air-permeable film 2 is held between the first metal body 14 and the second metal body 6 by press-fitting the second metal body 6 into the first metal body 14.

  The rubber part 16 is a part having a third through hole 16h into which a ventilation nozzle provided in a ventilation-requiring article such as a housing can be inserted. The third through hole 16h is a second part of the second metal body 6. It arrange | positions in space SH (refer FIG. 2) enclosed by the trunk | drum 14b of the 1st metal body 14, and the 2nd metal body 6 so that it may communicate with the through-hole 6h. As shown in FIG. 6, by providing the rubber part 16, the ventilation member 20 can be attached to the housing 18 with one touch. Since the rubber component 16 is restrained by the first metal body 14 and hardly bulges outward, the attachment strength of the ventilation member 20 to the housing 18 is good.

  Specifically, the rubber part 16 has a cylindrical shape. The outer diameter of the rubber component 16 is slightly larger than or equal to the inner diameter of the body portion 14b of the first metal body 14. That is, the rubber part 16 may be fixed to the body part 14b by elastically deforming, or the rubber part 16 may be exactly fit in the body part 14b of the first metal body 14 without elastically deforming. .

The diameter D ₃ of the third through hole 16 h of the rubber part 16 is larger than the diameter D ₂ of the second through hole 6 h of the second metal body 6. Therefore, a part of the second metal body 6 is exposed in the third through hole 16 h of the rubber part 16. According to such a configuration, as shown in FIG. 6, when the ventilation nozzle 181 provided in the housing 18 is inserted into the third through hole 16 h, the tip of the nozzle 181 comes into contact with the second metal body 6. Since the second metal body 6 functions as a stopper, there is no need to adjust the insertion depth of the nozzle 181 and the work of attaching the ventilation member 20 to the housing 18 is easy. Since the second metal body 6 has sufficient rigidity, there is an advantage that it is difficult to apply an excessive force to the gas permeable membrane 2 even if the nozzle 181 is pushed in somewhat strongly.

  In the present embodiment, the rubber part 16 is surrounded by the first metal body 14 and the second metal body 6. Therefore, chemicals and oils and fats that promote deterioration are difficult to touch the rubber part 16. Further, since the rubber part 16 is restrained by the first metal body 14, when the ventilation member 20 is attached to the nozzle 181 of the housing 18, elastic deformation of the rubber part 16 in the radial direction is prevented. Therefore, the attachment strength of the rubber component 16 to the housing 18 is improved.

  The material of the rubber part 16 is not particularly limited, but if heat resistance is important, use of a thermosetting elastomer is recommended. Specifically, nitrile rubber (NBR), ethylene-propylene rubber (EPDM), silicone rubber, fluorine rubber, acrylic rubber, and hydrogenated nitrile rubber can be used. When heat resistance and cold resistance are also required, EPDM or silicone rubber may be used. The rubber part 16 may be a foam.

  According to this embodiment, the rubber component 16 and the gas permeable membrane 2 are separated by the second metal body 6, and the gas permeable membrane 2 and the rubber component 16 are not in contact with each other. Therefore, it is not necessary to consider the compatibility (weldability or adhesiveness) between the gas permeable membrane 2 and the rubber part 16, and there is a large room for selecting a material for the rubber part 16. That is, although the weldability and adhesiveness with the gas permeable membrane 2 are not good, an elastomer having excellent heat resistance and chemical resistance can be suitably used for the rubber part 16.

  The body portion 14b of the first metal body 14 includes a caulking portion 14c that prevents the rubber component 16 from being detached from the space SH (see FIG. 2) on the side opposite to the side where the flat portion 4a is located. . The caulking portion 14c is a portion formed by plastically deforming the end of the body portion 14b on the side opposite to the side where the flat portion 4a is present. Typically, the caulking portion 14c can be formed by bending the end of the body portion 14b inward. The caulking portion 14c may be formed in the entire circumferential direction of the trunk portion 14b, or may be formed only in a part of the circumferential direction of the trunk portion 14b.

  It is also possible to omit the caulking portion 14c. That is, a configuration in which the rubber component 16 is added to the ventilation member 10 of the first embodiment can be employed. If the rubber component 16 is accommodated in the first metal body 14 in a sufficiently contracted state, the rubber component 16 is less likely to be detached from the space SH (FIG. 2). Alternatively, after forming the caulking portion 14c, the rubber part 16 may be formed by filling the body portion 14b of the first metal body 14 with resin.

(Third embodiment)
As shown in FIGS. 7 and 8, the ventilation member 30 of the present embodiment includes a first metal body 24, a gas permeable membrane 2, and a second metal body 6. The first metal body 24 is a component that constitutes a part (for example, the upper part) of the housing. The first metal body 24 has a flat portion 24a in which a first through hole 24h for ventilation is formed and a body portion 24b provided around the first through hole 24h. The air-permeable membrane 2 is held between the first metal body 24 and the second metal body 6 by press-fitting the second metal body 6 into the body portion 24 b of the first metal body 24. This point is common to the preceding embodiments.

  This embodiment is effective in that the gas permeable membrane 2 can be directly fixed to the first metal body 24 constituting the housing. In particular, when the parts constituting the casing are made of metal, adhesion and welding are difficult, and therefore the configuration of this embodiment is effective. Moreover, there exists an advantage that the protrusion height of the trunk | drum 24b from the surface of the flat part 24a can be suppressed significantly.

  Further, as shown in FIG. 9, plastic deformation is performed so that the end of the body portion 24b on the side opposite to the side where the flat portion 24a is located pushes the outer peripheral portion of the second metal body 6 toward the flat portion 24a. The caulking portion 24c may be formed. In this way, it is possible to completely prevent the press-in of the second metal body 6 from being loosened due to the effects of thermal expansion and vibration and the second metal body 6 from falling off the body portion 24b.

The disassembled perspective view of the ventilation member concerning 1st Embodiment of this invention. Cross-sectional perspective view of the ventilation member shown in FIG. Partial enlarged sectional view of the ventilation member shown in FIG. Cross section of the ventilation membrane Sectional perspective view of the ventilation member concerning 2nd Embodiment of this invention. FIG. 5 shows a state of use of the ventilation member shown in FIG. The disassembled perspective view of the ventilation member concerning 3rd Embodiment of this invention. Sectional drawing of the ventilation member shown in FIG. Sectional drawing of the modification of the ventilation member shown in FIG. An exploded perspective view of a conventional ventilation member Sectional view of a conventional ventilation member

Explanation of symbols

2 Ventilation membranes 4, 14, 24 First metal bodies 4a, 24a Flat portions 4b, 14b, 24b Body portions 4h, 24h First through hole 6 Second metal body 6h Second through holes 10, 20, 30, 40 Ventilation member 14c, 24c Caulking portion 16 Rubber part 16h Third through hole 18 Housing 181 Nozzle

Claims (6)

A first metal body having a hollow body part and a flat part located at one end of the body part and formed with a first through hole for ventilation;
A gas permeable membrane disposed on the flat portion so as to close the first through hole from the side of the body portion;
A second through-hole separated from the first through-hole of the first metal body by the gas-permeable film, and pressing the gas-permeable film against the flat portion of the first metal body to form the gas-permeable film and the flat The first metal body of the first metal body so that a gap between the first metal body and the gas permeable membrane and the gas permeable membrane is sealed, and air can be vented through the first through hole, the gas permeable membrane, and the second through hole. A second metal body press-fitted into the body,
A ventilation member comprising: The body of the first metal body has a cylindrical shape;
The second metal body has a disc shape;
2. The ventilation member according to claim 1, wherein an outer peripheral portion of the second metal body is in contact with the body portion of the first metal body over an entire circumferential direction.   A third through hole into which a ventilation nozzle provided in an article requiring ventilation such as a housing can be inserted, and the third through hole communicates with the second through hole of the second metal body. The ventilation member according to claim 1 or 2, further comprising a rubber part disposed in a space surrounded by the body portion of the first metal body and the second metal body.   The ventilation member according to claim 3, wherein a diameter of the third through hole of the rubber component is larger than a diameter of the second through hole of the second metal body.   The body portion of the first metal body includes a caulking portion that prevents the rubber part from being detached from the space on a side opposite to a side where the flat portion is located. Item 5. The ventilation member according to Item 4.   An end of the body portion on the side opposite to the side where the flat portion is located forms a caulking portion that is plastically deformed so as to push the outer peripheral portion of the second metal body toward the flat portion. The ventilation member according to claim 1 or 2.

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