JP7075418B2 - Housing kit and ventilation member - Google Patents

Description

The present invention relates to a housing kit and a ventilation member.

Conventionally, a structure in which a ventilation member is attached to a housing in which electric parts of an automobile such as a lamp, a motor, a sensor, a switch, and an ECU (Electronic Control Unit) are housed is known.

For example, Patent Document 1 describes a ventilation structure including a ventilation member attached to a ventilation opening of a housing. In this ventilation structure, the opening is tapered so that the opening diameter increases from the internal space of the housing to the external space of the housing. The ventilation member includes a seal ring having rubber elasticity, and the seal ring is deformed along the taper by being sandwiched between the support of the ventilation member and the housing in the opening. This ventilation structure exhibits high sealing performance against water sprayed from a direction parallel to the surface of the housing.

Patent Document 2 describes a ventilation unit including a ventilation member, a seal member, and an annular partition wall member. The ventilation member is attached to the opening of the housing. The sealing member seals the gap between the housing and the venting member. A ventilation member is fitted inside the annular partition wall member. The opening of the housing is reduced in diameter from the outside to the inside of the housing. According to the configuration of the ventilation unit, the gap between the peripheral edge portion of the ventilation member and the housing formed on the outside of the sealing member when the ventilation member is attached to the opening of the housing is closed by the partition wall member. Therefore, it is possible to prevent foreign matter from entering the housing from between the ventilation member and the housing even in an environment where a high external pressure acts.

Patent Document 3 describes a ventilation unit including a ventilation member, a seal member, and a washer. The ventilation member is attached to the opening of the housing and includes a waterproof ventilation membrane for covering the opening. The sealing member seals the gap between the housing and the venting member. The washer is pressed against the housing by the venting member around the sealing member. According to the configuration of the ventilation unit, the gap between the peripheral edge portion of the ventilation member and the housing formed on the outside of the sealing member when the ventilation member is attached to the opening of the housing is closed by the washer. Therefore, it is possible to prevent foreign matter from entering the housing from between the ventilation member and the housing even in an environment where a high external pressure acts.

Japanese Unexamined Patent Publication No. 2011-52791 Japanese Unexamined Patent Publication No. 2012-231808 Japanese Unexamined Patent Publication No. 2012-231809

The ventilation structure described in Patent Document 1 has room for improvement from the viewpoint of enhancing durability. Further, since the ventilation unit described in Patent Documents 2 and 3 includes a partition wall member and a washer, respectively, it cannot be said that the structure is simple. Therefore, the present invention provides a housing kit and a ventilation member which are advantageous for providing a ventilation structure having a simple structure and high durability.

The present invention
A housing kit including a housing having an opening and a ventilation member arranged in the opening and attached to the housing.
The ventilation member is
Ventilation membrane and
A support that supports the ventilation membrane at a position closer to the outer space of the housing than the locking portion when the locking portion locked to the inner surface of the housing and the ventilation member are attached to the housing. A support having a portion and forming a ventilation path between the internal space of the housing and the external space of the housing when the ventilation member is attached to the housing.
An annular sealing member that seals the gap between the housing and the support at the opening when the venting member is attached to the housing.
The housing is
A flat surface formed around the opening on the outer surface of the housing,
It has a tapered surface that forms a boundary with the flat surface and imparts an opening diameter to the opening that shrinks toward the internal space of the housing.
When the venting member is attached to the housing, the sealing member comes into contact with the boundary between the tapered surface and the flat surface and the edge of the tapered surface in contact with the boundary.
A housing kit is provided.

Further, the present invention
A ventilation member arranged in the opening of a housing having an opening and attached to the housing.
Ventilation membrane and
A support that supports the ventilation film at a position closer to the outer space of the housing than the locking portion locked to the inner surface of the housing and the ventilation member when the ventilation member is attached to the housing. A support having a portion and forming a ventilation path between the internal space of the housing and the external space of the housing when the ventilation member is attached to the housing.
An annular sealing member that seals the gap between the housing and the support at the opening when the ventilation member is attached to the housing.
The housing imparts an opening diameter to the opening, which forms a boundary between the flat surface formed around the opening on the outer surface of the housing and the flat surface and shrinks toward the internal space of the housing. With a tapered surface,
When the venting member is attached to the housing, the sealing member comes into contact with the boundary between the tapered surface and the flat surface and the edge of the tapered surface in contact with the boundary.
To provide a ventilation member.

Further, the present invention
Ventilation membrane and
A support having a support portion and a locking portion for supporting the ventilation membrane, and a support
With an annular sealing member attached to the support,
The seal member has an inclined surface that imparts an outer diameter that decreases toward the locking portion to the seal member.
The contour of the inclined surface of the cross section that appears by cutting the seal member along a plane including the axis of the seal member includes a straight line or a curved line inside a circle.
The circle passes through both ends of the cross section in the axial direction of the seal member and has a pair of parallel straight lines perpendicular to the axis of the seal member and ends of the cross section close to the axis in the direction perpendicular to the axis. As it passes, it touches a straight line parallel to the axis.
To provide a ventilation member.

The housing kit and ventilation members described above are advantageous in providing a highly durable ventilation structure with a simple configuration.

FIG. 1 is a cross-sectional view showing a ventilation structure provided by an example of a housing kit of the present invention. FIG. 2 is an exploded perspective view of the housing kit shown in FIG. FIG. 3 is a cross-sectional view of the housing kit shown in FIG. 1 before assembly. FIG. 4 is an enlarged cross-sectional view of a part of the ventilation structure provided by another example of the housing kit of the present invention. FIG. 5 is a cross-sectional view showing a ventilation structure provided by yet another example of the housing kit of the present invention. FIG. 6A is a cross-sectional view showing a ventilation structure provided by yet another example of the housing kit of the present invention. FIG. 6B is a cross-sectional view of the housing kit shown in FIG. 6A before assembly. FIG. 7A is a cross-sectional view showing a ventilation structure provided by yet another example of the housing kit of the present invention. FIG. 7B is a cross-sectional view of the housing kit shown in FIG. 7A before assembly.

Automotive electrical equipment such as lamps, motors, sensors, switches, ECUs, battery packs, inverters, converters, millimeter-wave radars, and in-vehicle cameras are ventilated so that the differential pressure generated inside them due to temperature changes is eliminated. Must have sex. In addition, such electrical equipment is also required to have properties that can prevent the ingress of foreign substances, water, oil, and salts. In order to impart such characteristics to an electric device, it is conceivable to attach a ventilation member provided with a ventilation film to the housing of the electrical equipment to provide a ventilation structure. In recent years, the types and numbers of electric devices mounted on automobiles have increased, and the modes of attaching ventilation members have also diversified. Based on these circumstances, the present inventors have studied the durability of the ventilation structure provided by the housing kit including the housing and the ventilation member from the viewpoint that the durability of the ventilation structure has not been paid attention to in the past. The electric device for automobiles is only an example of the application of the housing kit and the ventilation member according to the present invention, and the housing kit and the ventilation member according to the present invention are also applied to applications other than the electric device for automobiles. It is possible.

In the ventilation structure described in Patent Document 1, an annular groove is formed around the seal ring of the opening by the seal ring and the edge of the taper. The present inventors have newly found that if a liquid such as salt water accumulates in this annular groove, the housing may corrode and the durability of the ventilation structure may decrease. In particular, when the ventilation member is arranged in the opening where the external space of the housing is located above, the liquid collected in the annular groove is difficult to be discharged. According to the techniques described in Patent Documents 2 and 3, it is considered that the action of the partition wall member and the washer makes it difficult for the liquid to collect around the seal member. However, a partition wall member and a washer are required, and it is difficult to provide a ventilation structure with a simple structure. Therefore, as a result of repeated studies day and night, the present inventors have newly found a configuration in which liquid is less likely to collect around the seal member by drastically reviewing the mode of contact between the seal member and the housing, and a simple configuration. We have devised a housing kit and ventilation members that are advantageous in providing a highly durable ventilation structure.

As the techniques described in Patent Documents 1 to 3, O-rings are preferably used as the seal ring and the seal member because of their ease of manufacture or availability. On the other hand, the present inventors have newly found that when an O-ring is used as a sealing member in a ventilation structure, the force applied to a specific portion of the ventilation member tends to be large, and it is difficult to increase the durability of the ventilation structure. Therefore, the present inventors have repeatedly studied the shape of the seal member day and night, and have newly found the shape of the seal member which is advantageous for providing a ventilation structure having a simple structure and high durability.

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

As shown in FIGS. 1 and 2, the housing kit 1a includes a housing 10 and a ventilation member 20. The housing 10 has an opening 12, and the ventilation member 20 is arranged in the opening 12 and attached to the housing 10. Thereby, the housing kit 1a can provide a ventilation structure. The ventilation member 20 includes a ventilation membrane 22, a support 24, and an annular seal member 26. The support 24 has a locking portion 24a and a support portion 24b. The locking portion 24a is locked to the inner surface 11i of the housing 10 when the ventilation member 20 is attached to the housing 10. When the ventilation member 20 is attached to the housing 10, the support portion 24b supports the ventilation membrane 22 at a position closer to the external space of the housing 10 than the locking portion 24a. The support 24 forms a ventilation path 25 between the internal space of the housing 10 and the external space of the housing 10 when the ventilation member 20 is attached to the housing 10. The sealing member 26 seals the gap between the housing 10 and the support 24 at the opening 12 when the ventilation member 20 is attached to the housing 10. The housing 10 has a flat surface 11f and a tapered surface 11t. The flat surface 11f is formed around the opening 12 on the outer surface 11o of the housing 10. The tapered surface 11t forms a boundary 11b with the flat surface 11f and imparts an opening diameter to the opening 12 that shrinks toward the internal space of the housing 10. When the ventilation member 20 is attached to the housing 10, the seal member 26 comes into contact with the boundary 11b between the tapered surface 11t and the flat surface 11f and the edge portion 11e of the tapered surface 11t in contact with the boundary 11b. As a result, the liquid is less likely to collect around the seal member 26 at the opening 12, and the housing 10 is less likely to corrode. Therefore, the housing kit 1a is advantageous in providing a highly durable ventilation structure with a simple configuration.

The seal member 26 is typically elastically deformed between the housing 10 and the support 24 when the ventilation member 20 is attached to the housing 10. As a result, the sealing member 26 easily adheres to the housing 10 at the edge portion 11e and the boundary 11b of the tapered surface 11t, and high sealing performance can be exhibited. In this case, the material of the sealing member 26 is not particularly limited as long as it is an elastically deformable material, and is, for example, an elastomer such as synthetic rubber or a thermoplastic elastomer. In this case, the synthetic rubber is, for example, nitrile butadiene rubber (NBR), ethylene propylene rubber (EPDM), silicone rubber, fluororubber, acrylic rubber, or hydrided nitrile rubber. If the sealing member 26 can ensure high processing accuracy so that the sealing member 26 comes into contact with the boundary 11b and the edge portion 11e of the tapered surface 11t when the ventilation member 20 is attached to the housing 10. The seal member 26 does not have to be substantially elastically deformed between the housing 10 and the support 24.

When the ventilation member 20 is attached to the housing 10, the contact area between the seal member 26 and the tapered surface 11t is, for example, 60% or more of the area of the tapered surface 11t. In this case, high sealing performance is exhibited in the ventilation structure provided by the housing kit 1a. Further, even if the seal member 26 is momentarily separated from the boundary 11b for some reason, it is possible to prevent the liquid from entering the internal space of the housing 10, and the boundary 11b of the seal member 26 due to the elasticity of the seal member 26 or the like. The liquid that has entered the opening 12 can be expelled to the external space of the housing 10 in the process of recovering the contact with the housing 10.

As shown in FIGS. 1 and 3, the contour of the tapered surface 11t of the cross section that appears by cutting the housing 10 along the plane including the axis A1 of the opening 12 includes, for example, a straight line. This contour may include curved lines, straight lines and curved lines. In this case, the contour includes (i) a curved line, (ii) a straight line, and (iii) a curved line, and the lines (i) to (iii) are from the external space of the housing 10 to the inside of the housing 10. It may be connected in these orders toward the space. As shown in FIGS. 1 and 3, the contour that appears by cutting the seal member 26 along the plane including the axis A2 of the seal member 26 has a contact portion 26c. The contact portion 26c contacts the housing 10 when the ventilation member 20 is attached to the housing 10, and shows, for example, a straight line before the ventilation member 20 is attached to the housing 10. The contact portion 26c may show a curved line, or may show a straight line and a curved line, before the ventilation member 20 is attached to the housing 10. In addition, in FIGS. 1 and 3, the axis A1 and the axis A2 are on the same straight line. This also applies to FIGS. 4, 5, 6A, 6B, 7A, and 7B.

As shown in FIG. 3, in the ventilation member 20, the seal member 26 is attached to the support 24. The seal member 26 has, for example, an inclined surface 26s that imparts an outer diameter that decreases toward the locking portion 24a to the seal member 26. The contour of the inclined surface 26s of the cross section that appears by cutting the seal member 26 along the plane including the axis A2 of the seal member 26 includes, for example, a straight line or a curved line inside the circle C1. The circle C1 touches a pair of parallel straight lines L1 and a straight line L2 parallel to the axis A2. The pair of parallel straight lines L1 pass through both ends of the above cross section of the seal member 26 in the axial direction of the seal member 26 and are perpendicular to the axis A2 of the seal member 26. The straight line L2 passes through the end of the seal member 26 in the direction perpendicular to the axis A2 near the axis A2 in the above cross section. When the contour of the inclined surface 26s is formed in this way, the sealing member 26 easily comes into contact with the boundary 11b and the edge portion 11e when the ventilation member 20 is attached to the housing 10. Further, in the ventilation structure provided by the housing kit 1a, a wide sealing surface can be secured even if the compression strain of the sealing member 26 in the normal direction of the tapered surface 11t is small, and high sealing performance can be easily realized. In addition, since the stress applied to the support 24 or the housing 10 tends to be distributed over a wide range due to the compression deformation of the seal member 26, the ventilation structure is damaged due to the stress concentrated on a specific part of the support or the housing. Can be prevented and the durability of the ventilation structure provided by the housing kit 1a can be enhanced. Further, when the ventilation member 20 is attached to the housing 10, the inclined surface 26s can be easily moved along the tapered surface 11t, and the ventilation member 20 can be easily attached to the housing 10.

The contour of the inclined surface 26s of the cross section that appears by cutting the seal member 26 along the plane including the axis A2 of the seal member 26 typically includes the contact portion 26c. Therefore, in the housing kit 1a, at least a part of the inclined surface 26s is in contact with the housing 10.

As shown in FIG. 3, the contour of the inclined surface 26s of the cross section that appears by cutting the seal member 26 along the plane including the axis A2 of the seal member 26 is preferably before the ventilation member 20 is attached to the housing 10. , Straddles at least one of the first center line L3 and the second center line L4. The first center line L3 passes through the center of the circle C1 and is parallel to the axis line A2. The second center line L4 passes through the center of the circle C1 and is parallel to a pair of parallel straight lines L1. As a result, in the ventilation structure provided by the housing kit 1a, the seal member 26 is more likely to be reliably contacted by the boundary 11b and the edge portion 11e. Further, even if the compressive strain of the sealing member 26 in the normal direction of the tapered surface 11t is small, a wider sealing surface can be secured more reliably. In addition, damage to the ventilation structure due to stress concentration on a particular portion of the support or housing can be more reliably prevented.

As shown in FIG. 3, the contour of the inclined surface 26s of the cross section that appears by cutting the seal member 26 along the plane including the axis A2 of the seal member 26 is preferably before the ventilation member 20 is attached to the housing 10. , Extends across the second center line L4. As a result, in the ventilation structure provided by the housing kit 1a, the seal member 26 is more likely to be reliably contacted by the boundary 11b and the edge portion 11e. Further, even if the compressive strain of the sealing member 26 in the normal direction of the tapered surface 11t is small, a wider sealing surface can be secured more reliably. In addition, damage to the ventilation structure due to stress concentration on a particular portion of the support or housing can be more reliably prevented.

As shown in FIG. 3, in the axial direction of the seal member 26, the end of the contour of the inclined surface 26s far from the locking portion 24a is located outside the circle C1 before the ventilation member 20 is attached to the housing 10. As a result, in the ventilation structure provided by the housing kit 1a, the seal member 26 is more likely to be reliably contacted by the boundary 11b and the edge portion 11e. Further, even if the compressive strain of the sealing member 26 in the normal direction of the tapered surface 11t is small, a wider sealing surface can be secured more reliably. In addition, damage to the ventilation structure due to stress concentration on a particular portion of the support or housing can be more reliably prevented.

As shown in FIG. 3, in the axial direction of the seal member 26, the end of the contour of the inclined surface 26s near the locking portion 24a is located outside the circle C1 before the ventilation member 20 is attached to the housing 10. As a result, even if the compressive strain of the sealing member 26 in the normal direction of the tapered surface 11t is small, a wider sealing surface can be secured more reliably. In addition, damage to the ventilation structure due to stress concentration on a particular portion of the support or housing can be more reliably prevented.

As shown in FIG. 3, the contour of the inclined surface 26s of the cross section that appears by cutting the seal member 26 along the plane including the axis A2 of the seal member 26 is, for example, before the ventilation member 20 is attached to the housing 10. Inside the circle C1, there is a straight line portion 26r having a curvature of 0. As a result, in the ventilation structure provided by the housing kit 1a, it is easy to secure a wide sealing surface even if the compression strain of the sealing member 26 in the normal direction of the tapered surface 11t is small, and it is easy to realize high sealing performance. In addition, the stress applied to the support 24 or the housing 10 tends to be distributed over a wide range due to the compression deformation of the seal member 26.

Desirably, when the ventilation member 20 and the housing 10 are arranged so that the axis A1 and the axis A2 are aligned in a straight line before the ventilation member 20 is attached to the housing 10, the straight line portion 26r connects the axis A1. It is parallel to the straight line included in the contour of the tapered surface 11t of the cross section that appears by cutting the housing 10 along the including plane. In this case, in the ventilation structure provided by the housing kit 1a, even if the compressive strain of the sealing member 26 in the normal direction of the tapered surface 11t is small, it is easy to secure a wider sealing surface more reliably, and high sealing performance is realized. Cheap. In addition, the stress applied to the support 24 or the housing 10 due to the compressive deformation of the seal member 26 is more likely to be more reliably distributed over a wide range.

As shown in FIG. 1, the support 24 has, for example, a plurality of legs (4 in this example). The plurality of legs 24l are arranged apart from each other around the axis A2 of the sealing member 26. In addition, the plurality of legs 24l include a locking portion 24a at their tips. When the ventilation member 20 is attached to the housing 10, a part of the sealing member 26 gets into, for example, between the plurality of legs 24l. As a result, the magnitude of the force applied to the support 24 due to the compression deformation of the seal member 26 can be reduced. As a result, the durability of the ventilation member 20 and, by extension, the durability of the ventilation structure provided by the housing kit 1a can be enhanced.

The locking portion 24a has, for example, a hook-shaped portion that protrudes outward in a direction perpendicular to the axis A2, whereby a locking surface is formed. When the ventilation member 20 is attached to the housing 10, the locking surface of the locking portion 24a comes into contact with the inner surface 11i of the housing 10, so that the movement of the ventilation member 20 in the axial direction of the opening 12 is restricted. .. In the ventilation structure provided by the housing kit 1a, the ventilation member 20 can be removed from the housing 10 by elastically deforming at least one of the plurality of legs 24l so as to be close to the axis A2.

The breathable membrane 22 is not particularly limited as long as it is a breathable membrane, but is typically waterproof and blocks the permeation of liquid while allowing the permeation of gas. To this extent, the structure and material of the breathable membrane 22 are not particularly limited, and the breathable membrane 22 is, for example, a woven fabric, a non-woven fabric, a mesh, a net, a sponge, a foam, or a porous body made of a metal material or a resin material. ..

The breathable membrane 22 may have, for example, a membrane body and a reinforcing material superposed on the membrane body. The reinforcing material improves the strength of the ventilation membrane 22. The membrane body and the reinforcing material are bonded together, for example, by thermal lamination, heat welding, or an adhesive. Of course, the ventilation membrane 22 may be composed of only the membrane body.

The ventilation membrane 22 includes, for example, a resin porous membrane. The resin porous membrane can be produced by a known method such as a stretching method or an extraction method. The material of the resin porous membrane is not particularly limited, and is, for example, fluororesin, polyolefin, polyacrylonitrile, nylon, or polylactic acid. As the fluororesin, for example, polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, or tetrafluoroethylene-ethylene copolymer can be used. As the polyolefin, homopolymers or copolymers obtained from monomers such as ethylene, propylene, 4-methylpentene-1, and 1-butene can be used. When the material of the resin porous film is polyacrylonitrile, nylon, or polylactic acid, the resin porous film is, for example, a porous film formed of fibers having nanometer-sized dimensions of these polymers. Above all, the PTFE porous membrane is preferably used as the resin porous membrane in consideration of being able to secure appropriate air permeability in a small area and having a high function of preventing foreign matter from entering the inside of the housing.

The resin porous membrane may be subjected to a liquid repellent treatment depending on the use of the housing kit 1a. The liquid repellent treatment is performed, for example, by forming a liquid repellent film containing a polymer having a perfluoroalkyl group or the like on the resin porous film. The formation of the liquid-repellent film is not particularly limited, and is, for example, by a method such as an air spray method, an electrostatic spray method, a dip coating method, a spin coating method, a roll coating method, a curtain flow coating method, or an impregnation method. It is done by coating the resin porous membrane with a solution or dispersion of a polymer having a perfluoroalkyl group. Further, a liquid-repellent film may be formed by an electrodeposition coating method or a plasma polymerization method.

As shown in FIG. 1, in the support body 24, the support portion 24b has, for example, an annular surface, and the ventilation membrane 22 is supported by the annular surface. The ventilation film 22 is welded by, for example, hot plate welding, ultrasonic welding, laser welding, or the like. The ventilation film 22 is supported by pouring the resin into the mold and insert-molding the support 24 in a state where the resin is fixed at a position in contact with the resin forming the support portion 24b in the mold for molding the support 24. It may be supported by the portion 24b.

The support 24 has, for example, a base portion 24c and a shaft portion 24d. The base 24c includes a support 24b. The base portion 24c is formed in a flange shape, for example. Further, the shaft portion 24d protrudes from the base portion 24c, and the tip portion of the shaft portion 24d includes a locking portion 24a. As shown in FIG. 1, the corner 24e is formed by the base portion 24c and the shaft portion 24d. When the ventilation member 20 is attached to the housing 10, the seal member 26 is in contact with the support 24 so as to cover the corner 24e, for example.

The support 24 has, for example, a plurality of protective walls 24p on the outside of the annular surface of the support portion 24b. The plurality of protective walls 24p are arranged apart from each other around the axis A2. As a result, the ventilation membrane 22 is protected, and the gaps between the plurality of protective walls 24p form a part of the ventilation path 25. The support 24 has a plurality of slopes 24s on the outside of the protective wall 24p. As a result, foreign matter or liquid blocked by the protective wall 24p is discharged along the slope 24s.

As shown in FIG. 1, for example, the ventilation member 20 further includes a cover 28. The cover 28 covers the ventilation film 22 at a position farther from the locking portion 24a than the ventilation film 22. Thereby, the ventilation membrane 22 can be appropriately protected.

The cover 28 has, for example, a disc-shaped main body 28a and a plurality of side walls 28b, and the plurality of side walls 28b are arranged apart from each other around the axis A2 and from the peripheral edge portion of the main body 28a toward the support 24. It stands out. The main body 28a is in contact with or faces the end surface of the protective wall 24p of the support 24 at a position closer to the axis A2 than the plurality of side walls 28b. The plurality of side walls 28b are fitted between the plurality of slopes 24s. In addition, the plurality of side walls 28b cover the gaps between the plurality of protective walls 24p. The gap between the plurality of side walls 28b forms an inlet or an outlet of the ventilation path 25.

The materials of the support 24 and the cover 28 are not particularly limited, but are preferably polyamide (PA), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT) from the viewpoint of moldability or weldability. , Polycarbonate (PC), polypropylene (PP), polyphenylene ether (PPE) and the like. The material of the support 24 and the cover 28 may be a thermosetting resin or a metal material.

The material of the housing 10 is not particularly limited, and the housing 10 is made of, for example, a metal material or a resin material.

The housing kit 1a can be changed from various viewpoints. For example, even if the housing kit 1a is modified as the housing kit 1b, the housing kit 1c, the housing kit 1d, and the housing kit 1e shown in FIGS. 4, 5, 6A, and 7A, respectively. good. The housing kit 1b, the housing kit 1c, the housing kit 1d, and the housing kit 1e are configured in the same manner as the housing kit 1a, unless otherwise specified. The components of the housing kit 1b, the housing kit 1c, the housing kit 1d, and the housing kit 1e that are the same as or corresponding to the components of the housing kit 1a are designated by the same reference numerals, and detailed description thereof will be omitted. .. The description of the housing kit 1a also applies to the housing kit 1b, the housing kit 1c, the housing kit 1d, and the housing kit 1e, as long as there is no technical conflict.

As shown in FIG. 4, in the housing kit 1b, when the ventilation member 20 is attached to the housing 10, a cross section that appears by cutting the housing 10 and the ventilation member 20 along a plane including the axis A1 of the opening 12. The contour of the seal member 26 in the external space of the housing 10 is located closer to the axis A1 of the opening 12 than the reference straight line L5. Here, the reference straight line L5 passes through the contact point CP between the seal member 26 and the housing 10 at the position farthest from the axis A1 of the opening 12, and is flat at a position farther from the axis A1 of the opening 12 than the contact point CP. It is a straight line forming an angle of 60 ° with the straight line L6 formed by the surface 11f. In this case, it is difficult for the liquid to collect around the seal member 26 in the external space of the housing 10. As a result, the housing 10 is less likely to corrode, and the ventilation structure provided by the housing kit 1b can more reliably exhibit high durability. The contour of the seal member 26 is preferably located closer to the axis A1 than the straight line at an angle of 70 ° with the straight line L6, and more preferably closer to the axis A1 than the straight line at an angle of 80 ° with the straight line L6. It is located closer to the axis A1 than the straight line forming an angle of 90 ° with the straight line L6.

As shown in FIG. 5, in the housing kit 1c, the contour of the tapered surface 11t of the cross section that appears by cutting the housing 10 along the plane including the axis A1 of the opening 12 includes a curved line. For example, this contour is curved so as to bulge toward the seal member 26. Even in this case, when the ventilation member 20 is attached to the housing 10, the seal member 26 is appropriately elastically deformed so that the seal member 26 comes into contact with the boundary 11b and the edge portion 11e.

As shown in FIGS. 6A and 6B, in the housing kit 1d, the contour of the tapered surface 11t of the cross section that appears by cutting the housing 10 along the plane including the axis A1 of the opening 12 includes a straight line. In addition, as shown in FIG. 6B, the contour of the inclined surface 26s of the cross section that appears by cutting the seal member 26 along the plane including the axis A2 of the seal member 26 has a straight line portion 26r. As shown in FIG. 6B, when the ventilation member 20 and the housing 10 are arranged so that the axis A1 and the axis A2 are aligned with each other before the ventilation member 20 is attached to the housing 10, the inclination angle θ2 is inclined. Greater than the angle θ1. The inclination angle θ2 is an inclination angle of the straight line portion 26r with respect to the axis A2 of the seal member 26. The inclination angle θ1 is an inclination angle with respect to the linear axis A1 included in the contour of the tapered surface 11t of the cross section that appears by cutting the housing 10 along the plane including the axis A1 of the opening 12. In this case, in the ventilation structure provided by the housing kit 1d, the compressive strain of the sealing member 26 caused by the pressing of the tapered surface 11t and the support 24 tends to decrease toward the internal space of the housing 10. Therefore, the force applied to the support 24 due to the deformation of the seal member 26 tends to be small at a position close to the locking portion 24a of the support 24, the durability of the support 24, and the ventilation structure provided by the housing kit 1d. High durability.

As shown in FIG. 7A, in the housing kit 1e, the support body 24 has a base portion 24c including the support portion 24b, and a shaft portion 24d protruding from the base portion 24c and including a locking portion 24a at the tip end portion thereof. A corner 24e is formed by the base portion 24c and the shaft portion 24d. As shown in FIG. 7B, an annular gap G1 is formed between the corner 24e and the seal member 26 before the ventilation member 20 is attached to the housing 10. As a result, a part of the seal member 26 that moves with the deformation of the seal member 26 when the ventilation member 20 is attached to the housing 10 to provide the ventilation structure is accepted by the gap G1.

Claims (19)

A housing kit including a housing having an opening and a ventilation member arranged in the opening and attached to the housing.
The ventilation member is
Ventilation membrane and
A support that supports the ventilation membrane at a position closer to the outer space of the housing than the locking portion when the locking portion locked to the inner surface of the housing and the ventilation member are attached to the housing. A support having a portion and forming a ventilation path between the internal space of the housing and the external space of the housing when the ventilation member is attached to the housing.
An annular sealing member that seals the gap between the housing and the support at the opening when the venting member is attached to the housing.
The housing is
A flat surface formed around the opening on the outer surface of the housing,
It has a tapered surface that forms a boundary with the flat surface and imparts an opening diameter to the opening that shrinks toward the internal space of the housing.
When the venting member is attached to the housing, the sealing member comes into contact with the boundary between the tapered surface and the flat surface and the edge of the tapered surface in contact with the boundary.
When the ventilation member is attached to the housing, the sealing member is elastically deformed between the housing and the support.
The contour of the tapered surface of the first cross section that appears by cutting the housing along a plane containing the axis of the opening includes a straight line or a curved line.
The contour of the second cross section that appears by cutting the seal member along a plane including the axis of the seal member comes into contact with the housing when the ventilation member is attached to the housing, and the ventilation member is in contact with the housing. Has a contact portion indicating a straight or curved line before being attached to the housing.
The seal member has an inclined surface that imparts an outer diameter that decreases toward the locking portion to the seal member.
The contour of the inclined surface of the second cross section includes the contact portion and includes a straight line or a curved line inside the circle before the ventilation member is attached to the housing.
The circle passes through both ends of the second cross section in the axial direction of the seal member and is a pair of parallel straight lines perpendicular to the axis of the seal member and the axis of the second cross section in the direction perpendicular to the axis. Passing through an end close to and in contact with a straight line parallel to the axis,
Housing kit. The contour of the inclined surface passes through the center of the circle and the first center line parallel to the axis and the center of the circle and is parallel to the pair before the ventilation member is attached to the housing. The housing kit according to claim 1 , which extends across at least one of the second center lines parallel to a straight line. The housing kit according to claim 2 , wherein the contour of the inclined surface extends across the second center line before the ventilation member is attached to the housing. Claims 1 to 3 indicate that the end of the inclined surface in the axial direction of the sealing member, which is far from the locking portion of the contour of the inclined surface, is located outside the circle before the ventilation member is attached to the housing. The housing kit according to any one of the above items. Claims 1 to 4 indicate that, in the axial direction of the sealing member, the end of the contour of the inclined surface near the locking portion is located outside the circle before the ventilation member is attached to the housing. The housing kit according to any one of the above items. The contour according to any one of claims 1 to 5 , wherein the contour of the inclined surface has a straight portion having a curvature of 0 inside the circle before the ventilation member is attached to the housing. Housing kit. The contour of the tapered surface of the first cross section includes a straight line.
When the ventilation member and the housing are arranged so that the axis of the opening and the axis of the seal member are aligned with each other before the ventilation member is attached to the housing, the tapered surface of the taper surface. The straight line of the contour and the straight line portion are parallel to each other.
The housing kit according to claim 6 . The contour of the tapered surface of the first cross section includes a straight line.
When the ventilation member and the housing are arranged so that the axis of the opening and the axis of the seal member are aligned with each other before the ventilation member is attached to the housing, the straight portion of the straight portion. The inclination angle of the sealing member with respect to the axis is larger than the inclination angle of the straight line included in the contour of the tapered surface with respect to the axis.
The housing kit according to claim 6 . The supports are disposed apart around the axis of the seal member and have a plurality of legs including the locking portion at their tips.
When the ventilation member is attached to the housing, the sealing member enters between the plurality of legs.
The housing kit according to any one of claims 1 to 8 . The support further includes a base including the support, and a shaft portion protruding from the base and including the locking portion at the tip thereof.
An annular gap is formed between the corner formed by the base and the shaft and the seal member before the venting member is attached to the housing.
The housing kit according to any one of claims 1 to 9 . When the ventilation member is attached to the housing , a direction parallel to the axis of the opening in a third cross section that appears by cutting the housing and the ventilation member along a plane including the axis of the opening. The contour of the sealing member appearing in the space between the flat surface and the support in the above is located closer to the axis of the opening than the reference straight line.
The reference straight line passes through a contact point between the seal member and the housing at a position farthest from the axis of the opening, and is formed by the flat surface at a position farther from the axis of the opening than the contact point. A straight line that forms an angle of 60 ° with a straight line,
The housing kit according to any one of claims 1 to 10 . The housing kit according to any one of claims 1 to 11 , wherein the ventilation member further includes a cover that covers the ventilation membrane at a position farther from the locking portion than the ventilation membrane. A ventilation member arranged in the opening of a housing having an opening and attached to the housing.
Ventilation membrane and
A support that supports the ventilation film at a position closer to the outer space of the housing than the locking portion locked to the inner surface of the housing and the ventilation member when the ventilation member is attached to the housing. A support having a portion and forming a ventilation path between the internal space of the housing and the external space of the housing when the ventilation member is attached to the housing.
An annular sealing member that seals the gap between the housing and the support at the opening when the ventilation member is attached to the housing.
The housing imparts an opening diameter to the opening, which forms a boundary between the flat surface formed around the opening on the outer surface of the housing and the flat surface and shrinks toward the internal space of the housing. With a tapered surface,
When the venting member is attached to the housing, the sealing member comes into contact with the boundary between the tapered surface and the flat surface and the edge of the tapered surface in contact with the boundary.
The seal member has an inclined surface that imparts an outer diameter that decreases toward the locking portion to the seal member.
The contour of the inclined surface of the cross section that appears by cutting the seal member along a plane including the axis of the seal member includes a straight line or a curved line inside a circle.
The circle passes through both ends of the cross section in the axial direction of the seal member and has a pair of parallel straight lines perpendicular to the axis of the seal member and ends of the cross section close to the axis in the direction perpendicular to the axis. As it passes, it touches a straight line parallel to the axis.
Ventilation member. Ventilation membrane and
A support having a support portion and a locking portion for supporting the ventilation membrane, and a support
With an annular sealing member attached to the support,
The seal member has an inclined surface that imparts an outer diameter that decreases toward the locking portion to the seal member.
The contour of the inclined surface of the cross section that appears by cutting the seal member along a plane including the axis of the seal member includes a straight line or a curved line inside a circle.
The circle passes through both ends of the cross section in the axial direction of the seal member and has a pair of parallel straight lines perpendicular to the axis of the seal member and ends of the cross section close to the axis in the direction perpendicular to the axis. As it passes, it touches a straight line parallel to the axis.
Ventilation member. The contour of the inclined surface is at least one of a first center line that passes through the center of the circle and is parallel to the axis, and a second center line that passes through the center of the circle and is parallel to the pair of parallel straight lines. The ventilation member according to claim 14 , which extends straddling. The ventilation member according to claim 15 , wherein the contour of the inclined surface extends across the second center line. The ventilation member according to any one of claims 14 to 16 , wherein the end of the inclined surface of the inclined surface far from the locking portion in the axial direction of the sealing member is located outside the circle. The ventilation member according to any one of claims 14 to 17 , wherein the end of the inclined surface near the locking portion of the contour in the axial direction of the seal member is located outside the circle. The ventilation member according to any one of claims 14 to 18 , wherein the contour of the inclined surface has a straight portion having a curvature of 0 inside the circle.

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