Ventilation member and ventilation structure

Abstract

A ventilation member (1a) is provided with an inner member (10), a ventilation membrane (20), and an outer member (30). The inner member (10) comprises an elastomeric material and has an open tubular structure. The air-permeable membrane (20) covers one opening (13) of the inner member (10). The outer member (30) has a closed pipe structure. The inner member (10) is fixed to the outer member (30) in a state of forming a first contact portion (5c) with a portion of the inner peripheral surface of the outer member (30). The first contact portion (5c) is disposed between the center (C10) and one opening (13). The inner diameter of the outer member (30) is larger than the outer diameter of the inner member (10) between the first contact portion (5c) and the other opening (14). The outer member (30) has a protruding portion (31p) that forms a first contact portion (5c). A gap (30 g) is present around the protrusion (31p).

Description

Technical Field

[0001] The invention relates to a ventilation component and a ventilation structure. Background Art

[0002] Sometimes ventilation components are fixed to the housings of various electronic devices such as lamps, inverters, converters, electronic control units (ECUs), battery packs, radars, and cameras, as well as various electronic devices for home, medical, and office use. For example, ventilation components can be fixed to the housing to ensure ventilation inside and outside the housing, or to alleviate pressure changes inside the housing. In addition to air permeability, ventilation components are also required to have various properties such as dustproofness to prevent dust from entering the housing, waterproofness to prevent water from entering, oil resistance to prevent oil from entering, and CCT resistance to prevent salt from entering, depending on the use of the specific housing to be fixed.

[0003] For example, Patent Document 1 describes a protruding ventilation component that can be fixed to a housing. The ventilation component includes an internal component, a ventilation membrane, and an external component. The internal component has a protruding portion that protrudes outward from the outer periphery. The external component has a locking portion that locks the protruding portion. When viewed from above along the axis of the internal component and the external component, the outer diameter O of the protruding portion is B , the inner diameter of the locking part I H , and the inner diameter O of the portion of the outer member opposite to the protrusion O Satisfy I H <O B <O O It is explained that the ventilation component is useful for solving the problem associated with the deformation of the internal component due to the protrusion of the shell when fixed to the protrusion of the shell.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2021 / 145383 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The ventilation member described in Patent Document 1 has room for further study from the viewpoint of preventing the ventilation member from moving away from the protrusion after being attached to the protrusion of the housing.

[0009] Therefore, the present invention provides a ventilation member that is advantageous from the viewpoint of preventing the ventilation member from moving away from the protrusion after being attached to the protrusion of the housing.

[0010] Technical solutions to solve problems

[0011] The present invention provides a ventilation component, which comprises:

[0012] an internal member comprising an elastic material and having an open tube structure;

[0013] a vent membrane covering an opening of the inner member; and

[0014] The external member has a closed tube structure,

[0015] The inner member is fixed to the outer member in a state where the inner member is inserted into the inner portion of the outer member and a portion of the outer peripheral surface of the inner member is elastically deformed to form a first contact portion with a portion of the inner peripheral surface of the outer member.

[0016] The vent member can be inserted into the inner member through another opening of the inner member with a protrusion protruding in a cylindrical shape on the outer surface of the shell toward the edge of the vent hole that connects the inner space of the shell with the outer space, and the inner peripheral surface of the inner member is elastically deformed to form a second contact portion with the outer peripheral surface of the protrusion and is fixed to the protrusion.

[0017] The first contact portion is disposed between the center of a portion of the inner member overlapping with the outer member in the axial direction of the inner member and the one opening.

[0018] The inner diameter of the outer member is larger than the outer diameter of the inner member between the first contact portion and the other opening in the axial direction of the inner member,

[0019] The inner member and the outer member have a protrusion formed on the inner peripheral surface of the outer member or the outer peripheral surface of the inner member and forming the first contact portion,

[0020] Around the axis of the inner member, a gap exists between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member around the protrusion.

[0021] In addition, the present invention provides a ventilation structure having:

[0022] case;

[0023] an internal member comprising an elastic material and having an open tube structure;

[0024] a vent membrane covering an opening of the inner member; and

[0025] The external member has a closed tube structure,

[0026] The inner member is fixed to the outer member in a state where the inner member is inserted into the inner portion of the outer member and a portion of the outer peripheral surface of the inner member is elastically deformed to form a first contact portion with a portion of the inner peripheral surface of the outer member.

[0027] The housing has a protrusion on the outer surface of the housing that protrudes in a cylindrical shape toward the edge of a vent hole that connects the inner space of the housing with the external space.

[0028] The inner member is fixed in a state where the protrusion is inserted into the inner member from another opening of the inner member and the inner peripheral surface of the inner member is elastically deformed to form a second contact portion with the outer peripheral surface of the protrusion.

[0029] The first contact portion is disposed between the center of a portion of the inner member overlapping with the outer member in the axial direction of the inner member and the one opening.

[0030] The inner diameter of the outer member is larger than the outer diameter of the inner member between the first contact portion and the other opening in the axial direction of the inner member,

[0031] The inner member and the outer member have a protrusion formed on the inner peripheral surface of the outer member or the outer peripheral surface of the inner member and forming the first contact portion,

[0032] Around the axis of the inner member, a gap exists between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member around the protrusion.

[0033] Effects of the Invention

[0034] The above-mentioned ventilation member is advantageous from the viewpoint of preventing the ventilation member from moving away from the protrusion after being attached to the protrusion of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1A It is a plan view showing an example of the ventilation member according to the present invention.

[0036] Figure 1B yes Figure 1A A side view of the vent component is shown.

[0037] Figure 1C is along Figure 1A A side view of the ventilation component when viewed from the direction indicated by arrow C.

[0038] Figure 2A So Figure 1A A cross-sectional view of the ventilation component in which the line AA is a cutting line.

[0039] Figure 2B So Figure 1A A cross-sectional view of the ventilation component in which the line BB is a cutting line.

[0040] Figure 3 So Figure 2A The sectional view of the ventilation component is shown in which the line III-III is a cutting line.

[0041] Figure 4 Yes means have Figure 1A A cross-sectional view of an example of a ventilation structure of the ventilation member shown.

[0042] Figure 5 It is a perspective cross-sectional view schematically showing the force acting when the ventilation member according to the reference example is attached to the protrusion of the housing.

[0043] Fig. 6A It is a cross-sectional view showing another example of the ventilation member according to the present invention.

[0044] Figure 6B It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0045] Figure 6C It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0046] Fig.6D It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0047] Fig. 6E It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0048] Fig. 6F It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0049] Figure 6G It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0050] Fig. 7A It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0051] Figure 7B So Fig. 7A A cross-sectional view of the ventilation component in which the line VIIB-VIIB is a cutting line.

[0052] Figure 7C It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0053] Fig.7D It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0054] Fig. 8A It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0055] Figure 8B So Fig. 8A A cross-sectional view of the ventilation component in which the line VIIIB-VIIIB is a cutting line.

[0056] Figure 8C It is a cross-sectional view showing still another example of the ventilation member according to the present invention.

[0057] Fig. 9 This is a graph showing the relationship between the average value of the amount of change in the ventilation structure according to Example 1 and Comparative Example 1 and the test time.

[0058] Fig.10 This is a graph showing the relationship between the average value of the amount of change in the ventilation structure according to Example 2 and Comparative Example 2 and the test time. DETAILED DESCRIPTION

[0059] Embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments.

[0060] like Figure 1A , Figure 1B , Figure 1C , Figure 2A and Figure 2B As shown, the ventilation component 1a includes an internal component 10, a ventilation membrane 20 and an external component 30. The internal component 10 includes an elastic material and has an open tube structure. In other words, the internal component 10 is formed into a tube having openings at both ends. The ventilation membrane 20 covers an opening 13 of the internal component 10. The external component 30 has a closed tube structure. In other words, the external component 30 is formed into a tube having an opening only at one of the two ends. The internal component 10 is fixed to the external component 30 in a state where the internal component 10 is inserted into the interior of the external component 30 and a portion of the outer peripheral surface of the internal component 10 is elastically deformed to form a first contact portion 5c with a portion of the inner peripheral surface of the external component 30. The first contact portion 5c is arranged at the center C in the axial direction of the internal component 10. 10 Between an opening 13. Center C 10 The inner diameter of the outer member 30 is greater than the outer diameter of the inner member 10 between the first contact portion 5c and the other opening 14 in the axial direction of the inner member 10. Figure 3As shown, the outer member 30 has a protrusion 31p constituting the first contact portion 5c. The protrusion 31p is formed on the inner peripheral surface of the outer member 30. Around the axis of the inner member 10, around the protrusion 31p, there is a gap 30g between the inner peripheral surface of the outer member 30 and the outer peripheral surface of the inner member 10.

[0061] like Figure 4 As shown, the ventilation member 1a can be fixed to the protrusion 2p of the housing 2a in a state where the protrusion 2p is inserted into the interior of the internal member 10 from another opening 14 of the internal member 10 and the inner peripheral surface 12 of the internal member 10 is elastically deformed to form a second contact portion 6c with the outer peripheral surface 2q of the protrusion 2p. Thus, the ventilation structure 3a is provided. The protrusion 2p protrudes in a cylindrical shape on the outer surface of the housing 2a toward the edge 2f of the vent that connects the internal space 2u of the housing 2a with the external space 2v.

[0062] In the ventilation component 1a, the internal component 10 is fixed to the external component 30 in such a manner as to form the first contact portion 5c, so that the axis Ax of the internal component 10 is not easily tilted relative to the axis of the external component 30. When the ventilation component 1a is mounted on the protrusion 2p of the housing 2a, for example, the external component 30 is grasped. If the internal component 10 is not fixed to the external component 30 in such a manner as to form the first contact portion 5c, there is a possibility that the axis Ax of the internal component 10 is tilted relative to the axis of the external component 30, and the ventilation component 1a cannot be properly mounted on the protrusion 2p of the housing 2a. In the ventilation component 1a, by fixing the internal component 10 to the external component 30 in such a manner as to form the first contact portion 5c, such a problem is not easily generated, and the ventilation component 1a can be easily mounted on the protrusion 2p of the housing 2a in a desired state.

[0063] For example, when the inner member 10 before being fixed to the outer member 30 is viewed from above in a direction parallel to the axis Ax of the inner member 10, the diameter D of the circumscribed circle circumscribing the portion of the inner member 10 constituting the first contact portion 5c is 10 is larger than the diameter D of the inscribed circle inscribed in the portion of the external member 30 constituting the first contact portion 5 c. 30 Thus, in the ventilation member 1a, the first contact portion 5c can be formed in a desired state. 10 Relative to diameter D 30 Ratio D 10 / D 30 Not limited to a specific value. 10 / D 30 For example, it may be 1.01 to 1.3, may be 1.05 to 1.2, or may be 1.05 to 1.1.

[0064] As described above, in the ventilation component 1a, the inner diameter of the external member 30 is larger than the outer diameter of the internal member 10 between the first contact portion 5c and the other opening 14 in the axial direction of the internal member 10, and there is a gap 34. For example, in order to fix the ventilation component 1a to the protrusion 2p, the protrusion 2p is inserted into the interior of the internal member 10. The outer diameter of the protrusion 2p is larger than the inner diameter of the internal member 10. At this time, the internal member 10 contains an elastic material, so the internal member 10 is deformed in a manner that the inner diameter of the internal member 10 becomes larger due to the protrusion 2p. With this deformation, the outer diameter of the internal member 10 also becomes larger. Assuming that the inner diameter of the external member 30 is less than the outer diameter of the internal member 10 between the first contact portion 5c and the other opening 14 in the axial direction of the internal member 10, the internal member 10 is subjected to a large compressive stress between the protrusion 2p and the external member 30. Therefore, in order to insert the protrusion 2p into the interior of the internal member 10, a large force is required. However, in the ventilation component 1a, the inner diameter of the outer member 30 is larger than the outer diameter of the inner member 10 between the first contact portion 5c and the other opening 14 in the axial direction of the inner member 10, so when the protrusion 2p is inserted into the inner member 10, a part of the deformed inner member 10 is received by the gap 34. As a result, the inner member 10 is not easily subjected to a large compressive stress between the protrusion 2p and the outer member 30, and the force required to insert the protrusion 2p into the inner member 10 is easily reduced.

[0065] The difference ΔD obtained by subtracting the outer diameter of the internal member 10 from the inner diameter of the external member 30 between the first contact portion 5c and the other opening 14 in the axial direction of the internal member 10 is not limited to a specific value. The difference ΔD is, for example, 0.1 mm or more and 1.0 mm or less. Thus, when the ventilation component 1a is fixed to the cylindrical protrusion 2p of the housing 2a, it is easier to eliminate the problem associated with the deformation of the internal member 10.

[0066] The difference ΔD may be 0.2 mm or more, or 0.3 mm or more. The difference ΔD may be 0.9 mm or less, or 0.8 mm or less.

[0067] Figure 51 is a perspective cross-sectional view schematically showing the force acting when the ventilation component 1x involved in the reference example is mounted on the protrusion 2p of the housing 2a. The ventilation component 1x is configured in the same manner as the ventilation component 1a except that it does not have the protrusion 31p. When the ventilation component 1x is mounted on the protrusion 2p, the internal member 10 is deformed in such a manner that the inner diameter of the internal member 10 increases due to the protrusion 2p. With this deformation, the outer diameter of the internal member 10 increases, and the portion forming the first contact portion 5c of the internal member 10 also deforms toward the outside in a direction perpendicular to the axis Ax. When the rigidity of the external member 30 is higher than that of the internal member 10, the external member 30 presses the portion forming the first contact portion 5c of the internal member 10, and suppresses the portion forming the first contact portion 5c of the internal member 10 from deforming toward the outside in a direction perpendicular to the axis Ax. A force that presses the protrusion 2p acts by the compressive force of the external member 30 that is intended to press the portion forming the first contact portion 5c of the internal member 10. If the first contact portion 5c is arranged at the center C 10 Between the one opening 13, a force to lift the inner component 10 is likely to act near the front end of the protrusion 2p, and the ventilation member 1x may move away from the protrusion 2p after being attached to the protrusion 2p.

[0068] On the other hand, according to the ventilation member 1a, as Figure 3 As shown, the outer member 30 has a protrusion 31p constituting the first contact portion 5c, and there is a gap 30g around the protrusion 31p. Therefore, when the ventilation component 1a is mounted on the protrusion 2p, even if the inner member 10 is deformed in a manner that the inner diameter of the inner member 10 increases due to the protrusion 2p, the deformed portion is also received by the gap 30g, and the compressive force of the outer member 30 to press the portion constituting the first contact portion 5c of the inner member 10 becomes smaller. As a result, the force of the inner member 10 to rise is difficult to act near the front end of the protrusion 2p, and it is easy to prevent the ventilation component 1a from moving away from the protrusion 2p after being mounted on the protrusion 2p.

[0069] The size of the protrusion 31p around the axis Ax of the internal member 10 is not limited to a specific value. For example, in a plane perpendicular to the axis Ax of the internal member 10, a pair of straight lines connecting the two ends of the protrusion 31p around the axis Ax of the internal member 10 and the axis Ax form an angle θ of less than 20°. According to such a structure, the compressive force of the external member 30 to press the part of the internal member 10 constituting the first contact portion 5c becomes smaller, and it is easier to prevent the ventilation component 1x from moving away from the protrusion 2p after being installed on the protrusion 2p. The angle θ may be less than 15°, or less than 10°. The angle θ is, for example, more than 5°.

[0070] The outer member 30 includes, for example, a plurality of protrusions 31p. The plurality of protrusions 31p are, for example, arranged at equal intervals around the axis Ax. According to such a structure, in the ventilation component 1a, the axis of the outer member 30 is easily parallel to the axis Ax of the inner member 10, and when the ventilation component 1a is mounted on the protrusion 2p of the housing 2a while holding the outer member 30, the ventilation component 1a is easily mounted on the protrusion 2p of the housing 2a in a desired state.

[0071] The shape of the protrusion 31p is not limited to a specific shape. For example, the protrusion 31p has a rectangular outline in a cross-sectional view cut along a plane perpendicular to the axis Ax of the inner member 10. With such a structure, the outer member 30 can be easily manufactured by molding.

[0072] like Figure 2A As shown, the closed tube structure of the outer member 30 has a side wall 31 and a bottom wall 32. The side wall 31 extends along the axis Ax. The bottom wall 32 extends in a direction perpendicular to the axis Ax. The bottom wall 32 and the side wall 31 intersect to form a corner.

[0073] Typically, the air-permeable membrane 20 is covered by a bottom wall 32. The bottom wall 32 is disposed, for example, away from the air-permeable membrane 20 in the axial direction of the air-permeable member 1a. Therefore, a space 36 is formed between the bottom wall 32 and the air-permeable membrane 20. Gas passes through the space 36, thereby performing ventilation.

[0074] like Figure 2A and Figure 2B As shown, the internal member 10 has, for example, a central protrusion 11. The central protrusion 11 is formed on the outer peripheral surface of the internal member 10 at a position closer to the other opening 14 than the first contact portion 5c in the axial direction of the internal member 10. The central protrusion 11 protrudes in a direction perpendicular to the axis Ax of the internal member 10. According to such a structure, in the internal member 10, it is easy to determine the boundary between the portion where the first contact portion 5c is formed and the other portions.

[0075] like Figure 2A , Figure 2B as well as Figure 3 As shown, the outer member 30 has a protective wall 31n. When the outer member 30 is viewed from above along the axis Ax of the inner member 10, the protective wall 31n extends in a direction parallel to the axis Ax at a position closer to the axis Ax than the outermost end of the outer member 30 in the direction perpendicular to the axis Ax. The protective wall 31n protects the first contact portion 5c. According to such a structure, the first contact portion 5c is easily maintained in a desired state by protecting the first contact portion 5c with the protective wall 31n.

[0076] The protective wall 31n overlaps the central protrusion 11 in a direction perpendicular to the axis Ax, for example. According to such a structure, the inner member 10 and the outer member 30 are positioned in the axial direction by the protective wall 31n. Thus, for example, the distance between the bottom wall 32 of the outer member 30 and the air permeable membrane 20 can be adjusted to a desired value. Figure 2A As shown, for example, the end portion of the protection wall 31 n in the axial direction is opposed to the central protruding portion 11 of the inner member 10 .

[0077] The protection wall 31 n has, for example, an arc-shaped contour in a plan view. The protrusion 31 p is, for example, formed integrally with the protection wall 31 n and is disposed at the center of the protection wall 31 n around the axis Ax of the internal member 10 .

[0078] The exterior member 30 includes, for example, a plurality of protection walls 31n corresponding to the plurality of protrusions 31p. The plurality of protection walls 31n are arranged, for example, at equal intervals around the axis Ax.

[0079] like Figure 3 As shown, the central protrusion 11 is formed on the entire circumference of the outer peripheral surface of the open tube structure of the internal member 10. In other words, the central protrusion 11 is formed in an annular shape. According to such a structure, regardless of the arrangement of the internal member 10 around the axis Ax, the boundary between the portion where the first contact portion 5c is formed and other portions in the internal member 10 is easy to determine.

[0080] like Figure 2A and Figure 2B As shown, the outer member 30 has, for example, a locking portion 33. The locking portion 33 is formed on the inner peripheral surface of the outer member 30 and locks the central protrusion 11. Thus, in the ventilation component 1a, the outer member 30 can be prevented from falling off from the inner member 10.

[0081] like Figure 2A As shown, the locking portion 33 protrudes toward the axis Ax in a direction perpendicular to the axis Ax. The external member 30, for example, has a plurality of locking portions 33. The plurality of locking portions 33, for example, are arranged at predetermined intervals around the axis Ax. The plurality of locking portions 33, for example, are arranged at equal intervals around the axis Ax. The locking portion 33, for example, may also be formed in a ring shape on the inner peripheral surface of the closed tube structure of the external member 30.

[0082] like Figure 2BAs shown, the locking portion 33 has, for example, an inclined surface 33s. The distance between the inclined surface 33s at a specific position in the axial direction and the outer peripheral surface of the inner member 10 is greater than the distance between the inclined surface 33s at a position closer to the central protrusion 11 than the specific position in the axial direction and the outer peripheral surface of the inner member 10. According to such a structure, when the inner member 10 is installed inside the outer member 30, the friction force between the central protrusion 11 and the locking portion 33 is easily reduced. Therefore, it is easy to install the inner member 10 inside the outer member 30.

[0083] like Figure 2A As shown, the end surface of the central protrusion 11 in the direction perpendicular to the axis Ax has, for example, a conical surface 11t and a cylindrical surface 11p. The cylindrical surface 11p is formed at a position closer to the other opening 14 than the conical surface 11t. The diameter of the conical surface 11t decreases toward one opening 13. The ratio (Lt / Lz) of the length Lt of the portion forming the conical surface 11t in the axial direction to the length Lz of the entire central protrusion 11 is, for example, 0.2 to 0.8. For example, the internal component 10 and the external component 30 are relatively moved in a manner that the distance between the external component 30 and the internal component 10 is reduced in the axial direction, and the internal component 10 is installed inside the external component 30. At this time, the portion near the locking portion 33 of the external component 30 is deformed outward in the direction perpendicular to the axis Ax. If Lt / Lz is in the above range, when the internal component 10 is installed inside the external component 30, the deformation amount of the portion near the locking portion 33 is difficult to change sharply. Therefore, it is easy to install the internal component 10 inside the external component 30. Furthermore, since the length of the columnar surface 11 p in the axial direction is easily shortened, when the inner member 10 is mounted inside the outer member 30 , it is easy to shorten the period during which the deformation amount of the portion near the locking portion 33 is the maximum.

[0084] like Figure 1C and Figure 2A As shown, the ventilation member 1a has, for example, a ventilation hole 35. The ventilation hole 35 overlaps, for example, at least a portion of the first contact portion 5c in the axial direction of the inner member 10. According to such a structure, ventilation can be performed through the ventilation hole 35 between the first contact portion 5c and the other opening 14 in the axial direction of the inner member 10 even if the ventilation path formed between the outer peripheral surface of the inner member 10 and the inner peripheral surface of the outer member 30 is not wide.

[0085] The vent hole 35 is formed, for example, through the side wall 31. In other words, the vent hole 35 connects the inner peripheral surface of the side wall 31 and the outer peripheral surface of the side wall 31. The vent hole 35 is formed, for example, at a position closer to the bottom wall 32 than the protrusion 11 in the axial direction.

[0086] The vent hole 35 may be formed, for example, through the bottom wall 32. In other words, the vent hole 35 may be formed so as to connect the inner peripheral surface of the bottom wall 32 with the outer peripheral surface of the bottom wall 32. The vent hole 35 may be formed, for example, through the side wall 31 and the bottom wall 32. In other words, the vent hole 35 may be formed so as to connect the inner peripheral surface of the side wall 31 with the outer peripheral surface of the bottom wall 32, or may be formed so as to connect the inner peripheral surface of the bottom wall 32 with the outer peripheral surface of the side wall 31. The vent hole 35 may be formed as a through hole or as a slit.

[0087] like Figure 1C As shown, the vent hole 35 is formed, for example, so that at least one of the internal member 10 and the vent membrane 20 cannot be visually confirmed from the vent hole 35. In other words, the vent hole 35 is formed so that at least one of the internal member 10 and the vent membrane 20 cannot be visually confirmed when the inside of the external member 30 is observed through the vent hole 35 from the outside of the external member 30. In this case, for example, the inside of the external member 30 is observed in a direction perpendicular to the opening of the vent hole 35 that contacts the outer peripheral surface of the external member 30. According to such a structure, even if foreign matter passes through the vent hole 35 from the outside of the external member 30, it is easy to prevent at least one of the internal member 10 and the vent membrane 20 from being damaged by such foreign matter.

[0088] like Figure 1B and Figure 3 As shown, the side wall 31 includes, for example, an outer side wall 31g and a protective wall 31n. The outer side wall 31g includes, for example, a portion 31b of the outer member 30 opposite to the central protrusion 11 and a plurality of ribs 31r. The plurality of ribs 31r are arranged at predetermined intervals around the axis Ax between the portion 31b and the bottom wall 32 in the axial direction. Typically, the plurality of ribs 31r are arranged at equal intervals around the axis Ax. The protective wall 31n is arranged at a position closer to the axis Ax than the outer side wall 31g in a direction perpendicular to the axis Ax. The protective wall 31n is formed between the portion 31b and the bottom wall 32 in the axial direction.

[0089] The plurality of ribs 31r and the plurality of protection walls 31n are alternately arranged around the axis Ax, for example. Figure 1A As shown, recesses are formed at predetermined intervals around the axis Ax in the outer member 30. For example, around the axis Ax, the end of the rib 31r overlaps with the end of the protective wall 31n. Thus, the vent hole 35 is formed by the gap between the end of the rib 31r and the end of the protective wall 31n around the axis Ax. According to such a structure, the inner member 10 and the vent membrane 20 can be appropriately protected by the side wall 31, and the vent hole 35 can be easily formed to be wide.

[0090] The elastic material included in the internal member 10 is not limited to a specific elastic material. The elastic material is, for example, an elastomer (elastic resin). The elastomer may also be rubber. The elastomer is, for example, nitrile rubber (NBR), ethylene-propylene rubber (EPDM), silicone rubber, fluororubber, acrylic rubber, hydrogenated rubber, or various thermoplastic elastomers.

[0091] The material of the external member 30 is not limited to a specific material. The material of the external member 30 is, for example, a resin. The resin is, for example, a thermoplastic resin or the above-mentioned elastomer. Thermoplastic resins are, for example, polyamide (PA) such as nylon, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polycarbonate (PC), polypropylene (PP) or polyphenylene ether (PPE). The material of the external member 30 may be the same type of material as the elastic material included in the internal member 10, or a different type of material.

[0092] The resin contained in the inner member 10 and the outer member 30 may contain pigments such as carbon black and titanium white; reinforcing fillers such as glass particles and glass fibers; and additives such as a water-repellent agent.

[0093] The vent membrane 20 is not limited to a specific vent membrane as long as it has the desired air permeability. The vent membrane 20 can be a single-layer membrane or a multilayer membrane. When the vent membrane 20 is a multilayer membrane, each layer can be selected from a porous membrane, a non-woven fabric, a cloth and a net. The vent membrane 20 can include a porous membrane and a non-woven fabric, can include at least one of a cloth and a net and a porous membrane, and can also include a plurality of non-woven fabrics. The vent membrane 20 is typically composed of an organic polymer material (resin). The material of the porous membrane is, for example, a fluororesin. As a fluororesin, for example, polytetrafluoroethylene (PTFE), polytrifluorochloroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, or tetrafluoroethylene-ethylene copolymer can be used. The material of the porous membrane can be a polyolefin such as a monomer polymer or copolymer of monomers such as ethylene, propylene and 4-methylpentene-1,1-butene. The porous membrane can also be a porous membrane of nanofibers such as polyacrylonitrile, nylon or polylactic acid. The porous membrane can be manufactured by a known stretching method or extraction method. The material of the nonwoven fabric, the cloth, and the net is, for example, polyester such as polyethylene terephthalate, polyolefin such as polyethylene and polypropylene, nylon, aramid, or ethylene vinyl acetate copolymer.

[0094] The air-permeable membrane 20 preferably includes a PTFE porous membrane. The PTFE porous membrane can ensure air permeability even in a small area and can effectively prevent the invasion of foreign matter. The PTFE porous membrane can also be laminated on an air-permeable supporting material such as a nonwoven fabric.

[0095] The thickness of the air permeable membrane 20 is not limited to a specific thickness. The thickness of the air permeable membrane 20 is, for example, 1 μm or more and 5 mm or less. The air permeability of the air permeable membrane 20 is, for example, 0.1 to 300 seconds / 100 mL when measured according to the air permeability measurement method B (Gurley method) specified in Japanese Industrial Standard JIS L1096.

[0096] The vent film 20 may also be subjected to liquid repellent treatment as required. Liquid repellent treatment is performed, for example, by forming a liquid repellent film containing a fluorine-based surface modifier having a perfluoroalkyl group on the vent film 20. The formation of the liquid repellent film is not limited to a specific method. The formation of the liquid repellent film is performed, for example, by using methods such as air spraying, electrostatic spraying, dip coating, spin coating, roller coating, curtain coating or impregnation, and coating the resin porous film with a solution or dispersion of a fluorine-based surface modifier having a perfluoroalkyl group. In addition, the liquid repellent film may also be formed by an electrodeposition coating method or a plasma polymerization method.

[0097] Liquid repellent treatment may be applied to at least a portion of the surface of at least one of the inner member 10 and the outer member 30. Liquid repellent treatment may be applied by the above-mentioned method for liquid repellent treatment of the vent membrane 20, electrodeposition coating, or film formation by plasma polymerization.

[0098] The vent membrane 20 is, for example, bonded to the end face of the internal component 10 in the axial direction. The vent membrane 20 may also be welded to the end face. As a welding method, heat welding, ultrasonic welding, and laser welding can be used. In addition, when the internal component 10 is formed, the vent membrane 20 may be arranged at a predetermined position inside the mold for forming, and the resin may be flowed into the mold for insert molding, and the vent membrane 20 may be attached to the end face. The vent membrane 20 may also be attached to the end face by double-sided tape.

[0099] Using the ventilation member 1a, for example, it is possible to provide Figure 4 The ventilation structure 3a shown. The ventilation structure 3a includes a ventilation component 1a and a shell 2a. The shell 2a has a cylindrical protrusion 2p on its outer peripheral surface, and the ventilation component 1a is fixed to the protrusion 2p. Specifically, the internal component 10 of the ventilation component 1a is inserted into the interior of the internal component 10 from another opening 14 of the internal component 10, and is fixed to the protrusion 2p in a specific state in which the inner peripheral surface 12 of the internal component 10 abuts against the outer peripheral surface 2q of the protrusion 2p. The inner diameter of the open tube structure of the internal component 10 is smaller than the outer diameter of the protrusion 2p. In addition, the inner peripheral surface 12 of the internal component 10 is typically formed of an elastic material. Therefore, in a specific state, the portion of the internal component 10 abutting against the outer peripheral surface 2q of the protrusion 2p is deformed in accordance with the outer diameter of the protrusion 2p. As a result, the ventilation component 1a is firmly fixed to the protrusion 2p.

[0100] like Figure 4 As shown, according to the ventilation structure 3a, as shown by the dotted arrow, gas is ventilated between the inner space 2u and the outer space 2v of the housing 2a through the ventilation membrane 20. For example, the space 36 and the ventilation hole 35 are included in the ventilation path for the ventilation.

[0101] like Figure 4 As shown, an annular groove 2m is formed around the protrusion 2p of the shell 2a. When the ventilation structure 3a is viewed from above along the axis Ax, the outer diameter of the groove 2m is larger than the outer diameter of the ventilation component 1a. Therefore, when the ventilation component 1a is fixed to the protrusion 2p, a part of the ventilation component 1a is accommodated inside the groove 2m. According to such a structure, the area where the inner peripheral surface 12 of the internal component 10 abuts against the outer peripheral surface 2q of the protrusion 2p can be increased, and the ventilation component 1a can be easily fixed firmly to the protrusion 2p. In addition, the apparent protruding length of the ventilation component 1a on the outer surface of the shell 2a can be reduced. In the shell 2a, the groove 2m may not be formed around the protrusion 2p.

[0102] The material of the housing 2a is not limited to a specific material. The material of the housing 2a is, for example, resin, metal, or a composite material thereof. Typically, the elastic modulus of the material forming the protrusion 2p in the housing 2a is higher than the elastic modulus of the elastic material contained in the internal member 20. The housing 2a is, for example, a housing of an on-board electrical component such as a lamp, an inverter, a converter, an ECU (Electronic Control Unit), a battery pack, a radar, and a camera. The housing 2a may also be a housing of various electronic devices for household, medical, office, and the like.

[0103] The ventilation member 1a can be changed from various viewpoints. The ventilation member 1a can be changed to Fig. 6A The ventilation component 1b shown, Figure 6B The ventilation component 1c shown, Figure 6C The ventilation component 1d shown, Fig.6D The ventilation component 1e shown, Fig. 6E The ventilation component 1f shown, Fig. 6F The ventilation component 1g shown or Figure 6G The ventilation component 1h is shown. The ventilation components 1b to 1h are constructed in the same manner as the ventilation component 1a except for the parts specially described. The components of the ventilation components 1b to 1h that are the same as or correspond to the components of the ventilation component 1a are marked with the same symbols, and the detailed description is omitted. The description of the ventilation component 1a is also applicable to the ventilation components 1b to 1h as long as there is no technical contradiction.

[0104] like Fig. 6AAs shown, in the ventilation component 1b, a plurality of protrusions 31p are formed with respect to one protective wall 31n. For example, a pair of protrusions 31p are formed at both ends of the protective wall 31n around the axis Ax. According to such a structure, the axis Ax of the inner member 10 is more difficult to tilt with respect to the axis of the outer member 30, and the outer member 30 is more difficult to detach from the inner member 10.

[0105] like Figure 6B As shown, in the ventilation member 1c, the protrusion 31p has a semicircular outline in a cross-sectional view taken along a plane perpendicular to the axis Ax of the inner member 10. With such a structure, the outer member 30 can be easily manufactured by molding.

[0106] like Figure 6C As shown, in the ventilation member 1d, the protrusion 31p has a triangular outline in a cross-sectional view taken along a plane perpendicular to the axis Ax of the inner member 10. In this case, the outer member 30 can be easily manufactured by molding.

[0107] like Fig.6D As shown, in the ventilation component 1e, the inner member 10 has a protrusion 10p constituting the first contact portion 5c instead of the protrusion 31p. The protrusion 10p is formed on the outer peripheral surface of the inner member 10. According to such a structure, the force of the inner member 10 rising is difficult to act near the front end of the protrusion 2p, and it is easy to prevent the ventilation component 1x from moving away from the protrusion 2p after being mounted on the protrusion 2p.

[0108] In the ventilation member 1e, the inner component 10 has, for example, a plurality of protrusions 10p. The plurality of protrusions 10p are arranged, for example, at equal intervals around the axis Ax. The ventilation member 1e has a plurality of protection walls 31n. One protrusion 10p is formed with respect to one protection wall 31n.

[0109] The protrusion 10p has a rectangular outline in a cross-sectional view taken along a plane perpendicular to the axis Ax, for example. With such a structure, the inner member 10 can be easily manufactured by molding.

[0110] like Fig. 6E As shown, in the ventilation component 1f, a plurality of protrusions 10p are formed relative to one protective wall 31n. For example, around the axis Ax, a pair of protrusions 10p are formed so as to be able to contact both ends of the protective wall 31n. According to such a structure, the axis Ax of the inner member 10 is more difficult to tilt relative to the axis of the outer member 30, and the outer member 30 is more difficult to detach from the inner member 10.

[0111] like Fig. 6FAs shown, in the ventilation member 1g, the protrusion 10p has a semicircular outline in a cross-sectional view taken along a plane perpendicular to the axis Ax. In this case, the inner member 10 can be easily manufactured by molding.

[0112] like Figure 6G As shown, in the ventilation member 1h, the protrusion 10p has a triangular outline in a cross-sectional view taken along a plane perpendicular to the axis Ax. In this case, the inner member 10 can be easily manufactured by molding.

[0113] The ventilation member 1a may also be changed to Fig. 7A and Figure 7B The ventilation component 1i is shown. The ventilation component 1i is constructed in the same manner as the ventilation component 1a except for the parts specially described. The components of the ventilation component 1i that are the same as or correspond to the components of the ventilation component 1a are marked with the same symbols, and the detailed description is omitted. The description of the ventilation component 1a is also applicable to the ventilation component 1i as long as it is not technically contradictory.

[0114] like Fig. 7A and Figure 7B As shown, in the ventilation component 1i, the external member 30 has four protrusions 31p, for example, around the axis Ax of the internal member 10. The four protrusions 31p are arranged at equal intervals around the axis Ax. The four protrusions 31p protrude from the inner circumferential surface of the annular side wall 31 toward the axis Ax. The first contact portion 5c is formed separately from one opening 13 in the axial direction of the internal member 10. The outer circumferential surface of the internal member 10 that is in contact with one opening 13 is formed with a tapered surface. According to such a structure, the structure of the ventilation component 1i is easy to be simplified.

[0115] By using the ventilation component 1i, for example, a ventilation structure 3b can be provided. In the ventilation structure 3b, the ventilation component 1i is mounted on the protrusion 2p of the shell 2b. The shell 2b is configured similarly to the shell 2a except that the groove 2m is not provided. In the ventilation structure 3b, the space between the protrusions 31p around the axis Ax functions as a ventilation path.

[0116] The ventilation component 1i can also be changed to Figure 7C The ventilation member 1k and Fig.7D The ventilation components 1k and 1m are constructed similarly to the ventilation component 1i except for the parts specially described. The components of the ventilation components 1k and 1m that are the same as or correspond to the components of the ventilation component 1i are marked with the same reference numerals, and detailed descriptions are omitted. The descriptions of the ventilation components 1a and 1i are also applicable to the ventilation components 1k and 1m as long as they are not technically contradictory.

[0117] like Figure 7CAs shown, in the ventilation component 1k, the outer member 30 has six protrusions 31p around the axis Ax of the inner member 10. By assembling the ventilation component 1k to the housing 2b, the ventilation structure 3c can be provided. Fig.7D As shown, in the ventilation component 1m, the outer member 30 has eight protrusions 31p around the axis Ax of the inner member 10. By assembling the ventilation component 1m to the housing 2b, the ventilation structure 3d can be provided. The ventilation component 1i can also be changed so that the number of protrusions 31p of the outer member 30 is an integer greater than 2 other than 4, 6 and 8.

[0118] The ventilation member 1a may also be Fig. 8A and Figure 8B The ventilation component 1n is modified as shown in the figure. The ventilation component 1n is constructed in the same manner as the ventilation component 1a except for the parts specially described. The components of the ventilation component 1n that are the same as or correspond to the components of the ventilation component 1a are marked with the same symbols, and the detailed description is omitted. The description of the ventilation component 1a is also applicable to the ventilation component 1n as long as it is not technically contradictory.

[0119] In the ventilation component 1n, the internal component 10 has four protrusions 10p, for example, around the axis Ax of the internal component 10. The four protrusions 10p are arranged at equal intervals around the axis Ax. The four protrusions 10p contact the inner peripheral surface of the annular side wall 31 to form a first contact portion 5c. In the ventilation component 1n, the first contact portion 5c is formed separately from an opening 13 in the axial direction of the internal component 10. On the outer peripheral surface of the internal component 10, a tapered surface is formed between the first contact portion 5c and the opening 13 in the axial direction of the internal component 10. According to such a structure, the structure of the ventilation component 1n is easy to be simplified.

[0120] By using the ventilation member 1n, for example, a ventilation structure 3e can be provided. In the ventilation structure 3e, the ventilation member 1n is attached to the protrusion 2p of the housing 2b. In the ventilation structure 3e, the space between the protrusions 10p around the axis Ax functions as a ventilation path.

[0121] The ventilation component 1n can also be changed to Figure 8C The ventilation component 1o is shown. The ventilation component 1o is constructed in the same manner as the ventilation component 1n except for the parts specifically described. The components of the ventilation component 1o that are the same as or correspond to the components of the ventilation component 1n are marked with the same symbols, and the detailed description is omitted. The description of the ventilation components 1a and 1n is also applicable to the ventilation component 1o as long as there is no technical contradiction.

[0122] like Figure 8CAs shown, in the ventilation component 1o, the inner member 10 has eight protrusions 10p around the axis Ax of the inner member 10. By assembling the ventilation component 1o to the housing 2b, a ventilation structure 3f can be provided. The number of protrusions 31p of the outer member 30 of the ventilation component 1n can also be changed to an integer greater than 2 other than 4 and 8.

[0123] Example

[0124] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

[0125] <Example 1>

[0126] A ventilation component according to Example 1 having the same structure as the ventilation component 1a was produced. The dimension of the ventilation component according to Example 1 in the axial direction was about 7 mm. The length of the inner member of the ventilation component according to Example 1 in the axial direction was 5 mm. The inner diameter of the inner member of the ventilation component was 7.4 mm. The outer diameter D of the portion of the inner member constituting the contact portion between the inner member and the outer member was 1.3 mm. 10 The diameter D of the inscribed circle inscribed in the part of the external member constituting the contact portion is 30 9mm. The external component of the ventilation component involved in Example 1 has four protrusions that form contact portions, and in a plane perpendicular to the axis Ax of the internal component, a pair of straight lines connecting the two ends of the protrusion around the axis Ax of the internal component and the axis Ax form an angle θ of less than 11°. In a shell A having a cylindrical protrusion with a height of 3.7mm, the ventilation component is installed in a manner that the protrusion is completely covered by the ventilation component. In this installation, the protrusion is inserted into the interior of the internal component. The outer diameter of the protrusion in the shell A is 8mm, and the outer peripheral surface of the front end of the protrusion is formed to have a curvature radius of 0.5mm. In this way, the ventilation structure involved in Example 1 is obtained.

[0127] <Example 2>

[0128] The ventilating member of Example 1 was installed in a housing B having a cylindrical protrusion with a height of 3.7 mm so that the protrusion was completely covered by the ventilating member. In this installation, the protrusion was inserted into the interior of the internal member. The outer diameter of the protrusion in the housing B was 8.4 mm, and the outer peripheral surface of the front end of the protrusion was formed to have a curvature radius of 0.5 mm. In this way, the ventilating structure of Example 2 was obtained.

[0129] <Comparative Example 1>

[0130] The ventilation member according to Comparative Example 1 was produced in the same manner as in Example 1 except that the outer member did not have four protrusions. The outer diameter D of the portion of the inner member constituting the contact portion between the inner member and the outer member10 The diameter D of the inscribed circle inscribed in the part of the external member constituting the contact portion is 30 The ventilation member according to Comparative Example 1 was attached to the housing A in the same manner as in Example 1, except that the ventilation member according to Comparative Example 1 was used, thereby obtaining the ventilation structure according to Comparative Example 1.

[0131] <Comparative Example 2>

[0132] The ventilation member according to Comparative Example 1 was attached to the housing B in the same manner as in Example 2, except that the ventilation member according to Comparative Example 1 was used, thereby obtaining a ventilation structure according to Comparative Example 2.

[0133] (Thermal shock test)

[0134] Twelve ventilation structures of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 were prepared. A thermal shock test was performed by changing the ambient temperature of each ventilation structure within a range of -40°C to 125°C. In the thermal shock test, the ambient temperature of the ventilation structure was adjusted in such a way that one cycle of temperature change was produced in 1 hour. In one cycle of temperature change, the ambient temperature of the ventilation structure changed from 125°C to -40°C and then returned to 125°C. In the thermal shock test, 300 cycles of temperature change were produced in 300 hours. The distance from the root of the protrusion to the top of the ventilation component was measured at a specified time during the thermal shock test, and the distance from the root of the protrusion to the top of the ventilation component before the start of the thermal shock test was subtracted from the measured value to obtain the change amount of each ventilation structure, and the average value of the change amounts of the 12 ventilation structures was calculated. Fig. 9 The relationship between the average value of the amount of change of the ventilation structure according to Example 1 and Comparative Example 1 and the test time is shown. Fig.10 The relationship between the average value of the amount of change of the ventilation structure according to Example 2 and Comparative Example 2 and the test time is shown.

[0135] like Fig. 9 and Fig.10 As shown, in the ventilation structures according to Examples 1 and 2 using the ventilation member according to Example 1, the average value of the variation is smaller than that in the ventilation structures according to Comparative Examples 1 and 2 using the ventilation member according to Comparative Example 1. It can be understood that the ventilation member according to Example 1 is less likely to move away from the protrusion after being attached to the protrusion of the housing than the ventilation member according to Comparative Example 1.

[0136] A first aspect of the present invention provides a ventilation component, comprising:

[0137] an internal member comprising an elastic material and having an open tube structure;

[0138] a vent membrane covering an opening of the inner member; and

[0139] The external member has a closed tube structure,

[0140] The inner member is fixed to the outer member in a state where the inner member is inserted into the inner portion of the outer member and a portion of the outer peripheral surface of the inner member is elastically deformed to form a first contact portion with a portion of the inner peripheral surface of the outer member.

[0141] The vent member can be inserted into the inner member through another opening of the inner member with a protrusion protruding in a cylindrical shape on the outer surface of the shell toward the edge of the vent hole that connects the inner space of the shell with the outer space, and the inner peripheral surface of the inner member is elastically deformed to form a second contact portion with the outer peripheral surface of the protrusion and is fixed to the protrusion.

[0142] The first contact portion is disposed between the center of a portion of the inner member overlapping with the outer member in the axial direction of the inner member and the one opening.

[0143] The inner diameter of the outer member is larger than the outer diameter of the inner member between the first contact portion and the other opening in the axial direction of the inner member,

[0144] The inner member and the outer member have a protrusion formed on the inner peripheral surface of the outer member or the outer peripheral surface of the inner member and forming the first contact portion,

[0145] Around the axis of the inner member, a gap exists between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member around the protrusion.

[0146] A second aspect of the present invention provides a ventilation component, in the first aspect,

[0147] In a plane perpendicular to the axis of the internal member, a pair of straight lines connecting both ends of the protruding portion around the axis of the internal member and the axis form an angle of 20° or less.

[0148] A third aspect of the present invention provides a ventilation component, in the first aspect or the second aspect,

[0149] The protrusion is formed on the inner peripheral surface of the outer member.

[0150] A fourth aspect of the present invention provides a ventilation component, in the first aspect or the second aspect,

[0151] The protrusion is formed on the outer peripheral surface of the inner member.

[0152] A fifth aspect of the present invention provides a ventilation component, in any one of the first to fourth aspects,

[0153] The inner member has a central protrusion formed on an outer peripheral surface of the inner member at a position closer to the other opening than the first contact portion in the axial direction of the inner member and protruding in a direction perpendicular to the axial direction of the inner member.

[0154] A sixth aspect of the present disclosure provides a ventilation component, in the fifth aspect,

[0155] The outer member has a protective wall, and when the outer member is viewed from above along the axis of the inner member, the protective wall extends in a direction parallel to the axis at a position closer to the axis than the outermost end in a direction perpendicular to the axis, and protects the first contact portion.

[0156] The protection wall overlaps the central protrusion in a direction perpendicular to the axis.

[0157] A seventh aspect of the present disclosure provides a ventilation component, in the fifth aspect or the sixth aspect,

[0158] The outer member has a locking portion formed on an inner peripheral surface of the outer member and locking the central protrusion.

[0159] An eighth aspect of the present disclosure provides a ventilation component, in any one of the first to seventh aspects,

[0160] The outer member has a vent hole that overlaps with at least a portion of the first contact portion in the axial direction of the inner member.

[0161] A ninth aspect of the present disclosure provides a ventilation structure comprising:

[0162] case;

[0163] an internal member comprising an elastic material and having an open tube structure;

[0164] a vent membrane covering an opening of the inner member; and

[0165] The external member has a closed tube structure,

[0166] The inner member is fixed to the outer member in a state where the inner member is inserted into the inner portion of the outer member and a portion of the outer peripheral surface of the inner member is elastically deformed to form a first contact portion with a portion of the inner peripheral surface of the outer member.

[0167] The housing has a protrusion on the outer surface of the housing that protrudes in a cylindrical shape toward the edge of a vent hole that connects the inner space of the housing with the external space.

[0168] The inner member is fixed in a state where the protrusion is inserted into the inner member from another opening of the inner member and the inner peripheral surface of the inner member is elastically deformed to form a second contact portion with the outer peripheral surface of the protrusion,

[0169] The first contact portion is disposed between the center of a portion of the inner member overlapping with the outer member in the axial direction of the inner member and the one opening.

[0170] The inner diameter of the outer member is larger than the outer diameter of the inner member between the first contact portion and the other opening in the axial direction of the inner member,

[0171] The inner member and the outer member have a protrusion formed on the inner peripheral surface of the outer member or the outer peripheral surface of the inner member and forming the first contact portion,

[0172] Around the axis of the inner member, a gap exists between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member around the protrusion.

Claims

1. A ventilation component, wherein: have: an internal member comprising an elastic material and having an open tube structure; a vent membrane covering an opening of the internal member; as well as The external member has a closed tube structure, The inner member is fixed to the outer member in a state where the inner member is inserted into the inner portion of the outer member and a portion of the outer peripheral surface of the inner member is elastically deformed to form a first contact portion with a portion of the inner peripheral surface of the outer member. The vent member can be inserted into the inner member through another opening of the inner member with a protrusion protruding in a cylindrical shape on the outer surface of the shell toward the edge of the vent hole that connects the inner space of the shell with the outer space, and the inner peripheral surface of the inner member is elastically deformed to form a second contact portion with the outer peripheral surface of the protrusion and is fixed to the protrusion. The first contact portion is disposed between the center of a portion of the inner member overlapping with the outer member in the axial direction of the inner member and the one opening. The inner diameter of the outer member is larger than the outer diameter of the inner member between the first contact portion and the other opening in the axial direction of the inner member, The inner member and the outer member have a protrusion formed on the inner peripheral surface of the outer member or the outer peripheral surface of the inner member and forming the first contact portion, Around the axis of the inner member, a gap exists between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member around the protrusion.

2. The ventilation component according to claim 1, wherein: In a plane perpendicular to the axis of the internal member, a pair of straight lines connecting both ends of the protruding portion around the axis of the internal member and the axis form an angle of 20° or less.

3. The ventilation component according to claim 1, wherein: The protrusion is formed on the inner peripheral surface of the outer member.

4. The ventilation component according to claim 1, wherein: The protrusion is formed on the outer peripheral surface of the inner member.

5. The ventilation component according to claim 1, wherein The inner member has a central protrusion formed on an outer peripheral surface of the inner member at a position closer to the other opening than the first contact portion in the axial direction of the inner member and protruding in a direction perpendicular to the axial direction of the inner member.

6. The ventilation component according to claim 5, wherein: The outer member has a protective wall, and when the outer member is viewed from above along the axis of the inner member, the protective wall extends in a direction parallel to the axis at a position closer to the axis than the outermost end in a direction perpendicular to the axis, and protects the first contact portion. The protection wall overlaps the central protrusion in a direction perpendicular to the axis.

7. The ventilation component according to claim 5, wherein: The outer member has a locking portion formed on an inner peripheral surface of the outer member and locking the central protrusion.

8. The ventilation component according to claim 1, wherein The outer member has a vent hole that overlaps with at least a portion of the first contact portion in the axial direction of the inner member.

9. A ventilation structure comprising: case; an internal member comprising an elastic material and having an open tube structure; a vent membrane covering an opening of the internal member; as well as The external member has a closed tube structure, The inner member is fixed to the outer member in a state where the inner member is inserted into the inner portion of the outer member and a portion of the outer peripheral surface of the inner member is elastically deformed to form a first contact portion with a portion of the inner peripheral surface of the outer member. The housing has a protrusion on the outer surface of the housing that protrudes in a cylindrical shape toward the edge of a vent hole that connects the inner space of the housing with the external space. The inner member is fixed in a state where the protrusion is inserted into the inner member from another opening of the inner member and the inner peripheral surface of the inner member is elastically deformed to form a second contact portion with the outer peripheral surface of the protrusion, The first contact portion is disposed between the center of a portion of the inner member overlapping with the outer member in the axial direction of the inner member and the one opening. The inner diameter of the outer member is larger than the outer diameter of the inner member between the first contact portion and the other opening in the axial direction of the inner member, The inner member and the outer member have a protrusion formed on the inner peripheral surface of the outer member or the outer peripheral surface of the inner member and forming the first contact portion, Around the axis of the inner member, a gap exists between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member around the protrusion.

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