Ventilation housing and ventilation member

Abstract

A ventilation housing is provided in which the repulsion force FO of the seal ring and the bending force FL of each of the multiple leg parts satisfy equations (1) and (2). n is the number of leg portions. The repulsion force FO is the repulsion force of the seal ring when the ventilation member is pressed into the opening to the installation position while only the seal ring is pressed against the inclined surface of the opening, with the tip of the leg portion removed so that the leg portion does not come into contact with the housing. The bending force FL is the bending force of the leg portion required to bend the leg portion by pressing the hook portion from the outer surface side, with the protrusion height of the hook portion from the outer surface of the leg portion being the amount of press-in.

Description

Technology Field

[0001] The present invention relates to a ventilation housing having a ventilation member and a housing, and also to a ventilation member. Background Technology

[0002] In the housings of automotive electronic components 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, a ventilation member is sometimes fixed to ensure ventilation between the internal and external spaces of the housing while preventing the intrusion of foreign matter into the housing. The housing is used as a ventilation housing with the ventilation member installed in its opening.

[0003] Patent Document 1 discloses a ventilation housing suitable for preventing the intrusion of water sprayed at high pressure, assuming a high-pressure car wash test. In the ventilation housing disclosed in Patent Document 1, a tapered opening is provided in the housing, and a ventilation member is installed in the opening while a seal ring is pressed against the inclined surface of the opening. Since the sealing surface between the seal ring and the housing is located inside the opening, the ventilation housing of Patent Document 1 is suitable for maintaining sealability against water sprayed at high pressure. Prior art literature

[0004] Japanese Patent Publication No. 2011-52791 The problem to be solved

[0005] There is room for improvement in the durability of a ventilation housing equipped with a ventilation member installed while a seal ring is pressed against the inclined surface of the opening of the housing. The present invention provides a ventilation housing and a ventilation member suitable for improving durability. means of solving the problem

[0006] The present invention, from one aspect thereof,

[0007] A ventilation member and a housing in which the ventilation member is installed in an opening are provided.

[0008] The above-mentioned ventilation member is,

[0009] A support body comprising a base portion having a through hole and a plurality of leg portions extending from the base portion to surround a ventilation passage communicating with the through hole, wherein each of the plurality of leg portions has a hook portion protruding from the outer surface of said leg portion,

[0010] A sealing ring is provided to seal the space between the housing and the support while in contact with the plurality of leg portions, and

[0011] At least a portion of the above opening is tapered, and

[0012] The seal ring is pressed against the tapered inner circumferential inclined surface of the opening, and the hook portion is in contact with the inner surface of the housing, and the ventilation member is installed in the opening.

[0013] The repulsive force FO of the seal ring and the bending force FL of the leg part satisfy equations (1) and (2),

[0014] Provides a ventilation housing.

[0015]

[0016] However, n is the number of the plurality of leg parts, and

[0017] The above repulsive force FO is the repulsive force of the seal ring when the above ventilation member is pressed into the installation position in the opening while only the seal ring is pressed against the inclined surface, with the tip of the leg portion removed so that the leg portion does not come into contact with the housing.

[0018] The above bending force FL is the bending force of the leg portion required to bend the leg portion by pressing the hook portion from the outer surface side, with the protrusion height of the hook portion from the outer surface as the amount of pressing.

[0019] The present invention, from another aspect,

[0020] It is a ventilation member that can be installed in an opening of a housing, and

[0021] A support body comprising a base portion having a through hole and a plurality of leg portions extending from the base portion to surround a ventilation passage communicating with the through hole, wherein each of the plurality of leg portions has a hook portion protruding from the outer surface of said leg portion,

[0022] When installed in the above opening, it is provided with a sealing ring that seals the space between the housing and the support while in contact with the plurality of leg portions, and

[0023] The repulsive force fo of the above seal ring and the bending force FL of the above leg part satisfy equations (11) and (12),

[0024] Lack of ventilation.

[0025]

[0026] However, n is the number of the plurality of leg parts, and

[0027] The above repulsive force fo is the repulsive force of the seal ring when only the seal ring is pressed against the inclined surface, with the tip of the leg removed so that the leg does not contact the test plate, until the gap between the surface of the test plate having a tapered opening with an inclined surface of 60 degrees formed on the inner circumference and a maximum diameter matching the outer diameter of the seal ring and the base part becomes 0.5 mm.

[0028] The above bending force FL is the bending force of the leg portion required to bend the leg portion by pressing the hook portion from the outer surface side, with the protrusion height of the hook portion from the outer surface as the amount of pressing. Effects of the invention

[0029] According to the present invention, a ventilation housing and a ventilation member suitable for improving durability are provided. Brief explanation of the drawing

[0030] FIG. 1 is an exploded perspective view illustrating a ventilation member and a ventilation housing according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of a ventilation member according to one embodiment of the present invention. FIG. 3 is a cross-sectional view of a ventilation housing according to one embodiment of the present invention. Figure 4a is a cross-sectional view illustrating the measurement method of the repulsive force FO and fo of a seal ring. FIG. 4b is a cross-sectional view illustrating the measurement method of the repulsive force FO and fo of the seal ring together with FIG. 4a. Figure 5 is a cross-sectional view illustrating the method of measuring the bending force FL of the leg portion. Figure 6 is a diagram illustrating an example of the relationship between the indentation distance of a ventilation member and the insertion load (repulsion force). FIG. 7a is a cross-sectional view schematically illustrating the first step of the operation of pressing a ventilation member into an opening. FIG. 7b is a cross-sectional view schematically illustrating a step continuing from the step shown in FIG. 7a. FIG. 7c is a cross-sectional view schematically illustrating a step continuing from the step shown in FIG. 7b. FIG. 7d is a cross-sectional view schematically illustrating a step continuing from the step shown in FIG. 7c. FIG. 7e is a cross-sectional view schematically illustrating a step continuing from the step shown in FIG. 7d. Specific details for implementing the invention

[0031] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following description is not intended to limit the present invention to specific embodiments.

[0032] FIGS. 1 and 2 show a ventilation member (10) of an embodiment of the present invention. The ventilation member (10) comprises a cover (1), a ventilation membrane (2), a support body (3), and a seal ring (8). FIG. 1 shows a disassembled state of each component (1, 2, 3 and 8) constituting the ventilation member (10) along the central axis O of the ventilation member (10). FIG. 1 also shows a housing (20) having an opening (21) in which the ventilation member (10) is installed. The ventilation member (10) is installed in the opening (21) and can form a ventilation housing together with the housing (20). The central axis O of the ventilation member (10) coincides with the central axis of the opening (21), which has a circular cross-section.

[0033] As shown in FIG. 2, the cover (1) is installed on the support body (3) from above to cover the ventilation membrane (2). The cover (1) includes a ceiling portion (11) that covers the ventilation membrane (2) while being spaced apart from the ventilation membrane (2), and a wall portion (13) that extends from the periphery of the ceiling portion (11) toward the support body (3) and is fitted into the support body (3). A cutout is provided in the wall portion (13) so that the space (12) between the ventilation membrane (2) and the ceiling portion (11) communicates with the outside. The ventilation membrane (2) is a membrane that allows gas to pass through it in the thickness direction, is installed to cover the through hole (31) of the support body (3), and is supported on the support body (3) together with the cover (1). The ventilation membrane (2) may be a waterproof ventilation membrane capable of blocking water penetration, or a membrane having both waterproof and oil-repellent properties. However, the cover (1) is not limited to the shape shown in the illustration, and the ventilation membrane (2) is not mandatory.

[0034] The support body (3) includes a base portion (33) and a plurality of leg portions (35). The base portion (33) has a through hole (31). Each of the plurality of leg portions (35) extends from the base portion (33). Each of the plurality of leg portions (35) extends from the base portion (33) around the through hole (31) along the direction in which the through hole (31) extends. The space enclosed by the plurality of leg portions (35) forms a passage (32) that communicates with the through hole (31).

[0035] Multiple leg portions (35) may have the same shape. The number of leg portions (35) is not limited to the three shown, but may be two or more.

[0036] Each of the multiple leg portions (35) has a hook portion (37). The hook portion (37) protrudes outward from the side opposite to the passage (32), that is, from the outer surface (36) of the leg portion (35). The hook portion (37) is provided at the tip of the leg portion (35). The hook portion (37) may have a contact surface (39) facing the root side of the leg portion (35).

[0037] A seal ring (8) is installed at the base portion of a plurality of leg portions (35). The seal ring (8) is installed to surround the plurality of leg portions (35) from the outside, that is, its inner surface is in contact with the plurality of leg portions (35). The seal ring (8) is positioned to be in contact with the lower surface (34) of the base portion (33) together with the outer surface (36) of the leg portion (35).

[0038] FIG. 3 shows a ventilation housing of one embodiment of the present invention, that is, a housing (20) that is made ventilable by installing a ventilation member (10). The opening (21) of the housing (20) is tapered in at least a portion thereof. The opening (21) may have a tapered inner circumference that narrows as it progresses from the outer space (50) side of the housing (20) to the inner space (40) side. The opening (21) may be tapered in its entirety, or, as illustrated, may have a straight portion with a uniform inner diameter on the inner space (40) side. The opening (21) may be surrounded by an inclined surface (23) in the tapered portion and surrounded by a vertical surface (28) in the straight portion.

[0039] The seal ring (8) is compressed between the support body (3) and the housing (20) and seals the support body (3) and the housing (20) by the repulsive force. The seal ring (8) is compressed together with the base portion (33) and leg portion (35) of the support body (3) while in contact with the inclined surface (23) of the opening (21). In order to prevent the ventilation member (10) from detaching from the opening (21) by the repulsive force from the seal ring (8), the hook portion (37), specifically the contact surface (39) of the hook portion (37), is in contact with the inner surface (26) of the housing (20) around the opening (21). Due to the catch of the hook portion (37), the ventilation member (10) is held and supported in the opening (21) of the housing (20) without falling off.

[0040] The ventilation member (10) ensures ventilation between the external space (50) and the internal space (40) of the housing (20) through the internal ventilation path, specifically the space (12), ventilation membrane (2), through hole (31), and ventilation path (32). The ventilation member (10) provides sealing and ventilation to the opening (21) of the housing (20).

[0041] A gap having a length LG is provided between the lower surface (34) of the base portion (33) of the support (3) and the outer surface (24) of the housing (20). The length LG of the gap corresponds to the difference between the length LL of the leg portion (35), specifically the length LL from the base of the leg portion (35) to the contact surface (39) of the hook portion (37), and the wall thickness LB of the housing (20) (LG=LL-LB).

[0042] In the ventilation member (10), the diameter DC determined by the tip of the hook portion (37) is greater than the diameter DL determined by the root portion of the hook portion (37) on the outer surface (36) of the leg portion (35) (DC > DL). Furthermore, the difference between the two is equivalent to twice the protrusion height LC of the hook portion (37) from the outer surface (36) (DC - DL = 2LC). The height LC can also be expressed as the length of the contact surface (39) along the protrusion direction of the hook portion (37). The diameter DC can be set to be smaller than the maximum diameter DH of the opening (21) on the outer surface (24) of the housing (20) (DC <DH).

[0043] The absolute value of the difference between the outer diameter DS of the seal ring (8) and the maximum diameter DH of the opening (21) is preferably 0.6 mm or less, and also 0.3 mm or less. The outer diameter DS and the diameter DH may coincide.

[0044] The height LC of the hook portion is, for example, 0.8 mm or more and 1.5 mm or less, and also 1 mm or more and 1.2 mm or less. In addition, the slope angle θ of the inclined surface of the opening (21) may be, for example, 40 degrees or more and 75 degrees or less, and also 45 degrees or more and 70 degrees or less. The slope angle θ may be 60 degrees ± 5 degrees, and also 60 degrees ± 1 degree.

[0045] Additionally, LG, LB, and LL are lengths along the central axis O (see FIG. 1) of the ventilation member (10) and the opening (21), and diameters DC, DL, and DH and height LC are diameters and lengths along the direction perpendicular to the central axis O. The gradient angle θ is the angle formed by the plane perpendicular to the central axis O and the inclined plane (23).

[0046] The repulsive force from the compressed seal ring (8) enables the maintenance of sealability in the opening (21). In order to prevent the intrusion of water sprayed at high pressure, it is desirable for the repulsive force from the seal ring (8) to be large. Meanwhile, the repulsive force from the seal ring (8) acts as a force that pushes the leg portion (35) toward the central axis, that is, inwardly, causing it to fall over. In a form where at least a portion of the seal ring (8) is compressed between the outer circumference (36) of the leg portion (35) and the inner circumference inclined surface (23) of the opening (21), the bending stress from the seal ring (8) to the leg portion (35) is likely to increase.

[0047] An excessively large repulsive force from the seal ring (8) to the outer surface (36) of the leg portion (35) can cause the ventilation member (10) to detach from the opening (21), for example, when it acts for a long period of time along with temperature changes. To prevent the ventilation member (10) from detaching due to this factor, sufficient rigidity must be applied to the leg portion (35). However, if the rigidity of the leg portion (35) becomes too large, cracks may occur in the leg portion (35) when installing the ventilation member (10).

[0048] The processing of the part of the leg portion (35) where stress is concentrated during insertion, specifically the inner circumferential end of the leg portion (35) in the circumferential direction, has the effect of preventing the occurrence of cracks in the leg portion (35). This processing can be performed, for example, by chamfering and flattening the inner circumferential end (35e) of the leg portion (35). However, even if such processing is performed, there are cases where the occurrence of minute cracks cannot be prevented. Even if the crack is small in size, if temperature changes are applied to the leg portion (35) over a long period of time, it gradually expands and can cause damage to the leg portion (35).

[0049] The rigidity of the leg portion (35) can be evaluated using the bending force FL required to bend the leg portion (35) inward by pressing the hook portion (37) as an indicator. The amount of deformation of the leg portion (35) when the leg portion (35) is installed in the opening (21) can be considered as the protrusion height LC of the hook portion (37). Therefore, it is appropriate to measure the bending force FL as the amount of indentation of the hook portion (37) as the height LC. Details of the method for measuring the bending force FL will be described later.

[0050] It is preferable to set the bending force FL to less than 33N. A bending force FL in this range is advantageous for preventing minute cracks. The bending force FL may be 31N or less, 30N or less, and 29N or less. The bending force FL may be 18N or more, 20N or more, and 22N or more. For example, the bending force FL is 20N or more and less than 33N, and 22N or more and 31N or less.

[0051] It is preferable to appropriately determine the repulsion force FO (repulsion force when the housing is fixed) and repulsion force fo (repulsion force when the housing is not fixed) from the seal ring (8) by referring to the bending force FL. The repulsion forces FO and fo can be measured as the repulsion force of the seal ring (8) when the ventilation member (10) is pressed in until it is installed in the opening (21) while only the seal ring (8) is pressed against the inclined surface (23). In this measurement, an evaluation member is used in which the tip portion of the leg portion (35) is cut off from the ventilation member (10) so that the leg portion (35) does not come into contact with the housing (20). In this measurement, the pressing of the ventilation member (10) is performed so that the gap between the lower surface (34) of the base portion (33) and the outer surface (24) of the housing (20) reaches a length LG. Details of the measurement method for the repulsion forces FO and fo will be described later.

[0052] It is preferable that the repulsion force FO and fo be set according to the bending force FL of the leg portion (35) and the number n of the leg portion (35). It is preferable that the repulsion force FO and fo satisfy the following equation. In addition, for simplification, the repulsion force FO and fo are combined and denoted as "repulsion force FO" in the description of the following equation and numerical range.

[0053]

[0054] n is an integer greater than or equal to 2, for example, an integer in the range of 2 to 8, and may be 2, 3 or 4, 3 or 4, or 3.

[0055] The lower limit of FO / (n×FL) may be 0.014 or greater, 0.02 or greater, 0.05 or greater, 0.07 or greater, and 0.1 or greater. The upper limit of FO / (n×FL) may be 1.2 or less, 1 or less, and 0.8 or less. FO / (n×FL) is, for example, 0.02 or greater and 1.2 or less, and 0.05 or greater and 1 or less. Another example of FO / (n×FL) is 0.014 or greater and 1 or less.

[0056] From the perspective of preventing the intrusion of water sprayed at high pressure, it is desirable that the repulsion force FO be 5N or more, 7N or more, and also 9N or more.

[0057] However, for applications where the need for high-pressure water intrusion is low, or where the intrusion of high-pressure water can be prevented by other means, there is a low need to increase the repulsion force FO. An example of "other means" for preventing high-pressure water intrusion is a protective wall provided on the outer surface (24) of the housing (20) around the ventilation member (10). In such cases, the repulsion force FO may be set, for example, to 0.8N or more and less than 9N, and also to 1N or more and less than 7N.

[0058] The repulsion force FO may be 120N or less, 100N or less, and 80N or less. In the case of a breathable member that can be inserted without requiring a large compressive force, the repulsion force FO may be 70N or less, 60N or less, 50N or less, and 40N or less, and in some cases, 30N or less.

[0059] The repulsive force FO is, for example, 5N or more and 120N or less, 7N or more and 100N or less, and 7N or more and 80N or less. Other examples of the repulsive force FO are 0.8N or more and 70N or less, and also 1N or more and 60N or less.

[0060] The repulsive force FO and fo and the bending force FL can be controlled by the material, shape and dimensions of the ventilation member (10), and the shape and dimensions of the housing (20), particularly the opening (21). Although many factors can influence these forces, they can be controlled by understanding the relationship between each factor and the force and adjusting the factor. For example, the protrusion height of the hook portion (37) can influence the bending force FL. For example, the hardness of the rubber material constituting the seal ring (8) and the dimensions of each component related to the compression ratio of the seal ring (8) can influence the repulsive force FO and fo.

[0061] The measurement methods for the repulsive forces FO and fo and the bending force FL are described below.

[0062] (Measurement method of seal ring repulsion force FO and fo)

[0063] As shown in FIG. 4a, a test specimen is prepared by cutting off the tip of the leg portion (35) from the ventilation member to be measured, leaving the area near the root portion in contact with the seal ring (8). This cutting is performed to prevent the leg portion (35) from contacting the inner circumferential surface (23 and 28) of the opening (21) while maintaining the support surface of the seal ring (8) provided by the support body (3). When the housing to be installed for the ventilation member to be measured is not determined, that is, when measuring the repulsion force fo, a stainless steel (SUS) plate having a tapered opening is prepared as a test plate (60) that mimics a preferred housing. In the test plate (60), the opening (21) is designed to be desirable, that is, the slope angle θ of the inclined surface (23) is set to 60 degrees, and the diameter DH on the insertion side surface (24) of the opening (21) is set to be the same as the outer diameter DS of the seal ring (8).

[0064] Next, as shown in FIG. 4b, the test specimen is pressed along the central axis O with respect to the housing (20) or test plate (60) so that only the seal ring (8) contacts the inclined surface (23) of the opening (21), thereby compressing the seal ring (8). When the length LG of the gap between the lower surface (34) of the base part (33) of the support body (3) and the outer surface (24) of the housing (20) reaches a predetermined value (LL-LB, LL: length of the leg part, LB: wall thickness of the housing), or when the housing to be installed is not determined and LB cannot be specified, when the length LG reaches 0.5 mm, the reaction force in the direction along the central axis O from the seal ring (8) is measured and is designated as the repulsion force FO and fo, respectively. Additionally, "0.5 mm" is also a value considered desirable for the ventilation housing.

[0065] (Measurement method of leg bending force FL)

[0066] As shown in FIG. 5, the area around the ventilation member (10) to be measured is fixed by a fixing device (71). The fixing of the ventilation member (10) is performed so as not to hinder the bending of the leg portion (35). While maintaining the central axis O of the ventilation member (10) in alignment with the horizontal direction, the hook portion (37) is pressed vertically using a compression terminal (72). The pressing surface (73) of the compression terminal (72) is brought into contact with the circumferential center P (see FIG. 1) of the hook portion (37). The pressing speed is set to 300 mm / min and the pressing amount is set to the protrusion height LC of the hook portion (37), respectively, and the maximum value of the reaction force from the leg portion (35) is measured and set as the bending force FL.

[0067] As a characteristic involving repulsive forces FO and fo and bending force FL, the insertion load required for inserting a ventilation member into an opening can be cited. Below, an example of the relationship between the press-in distance of the ventilation member and the insertion load will be explained.

[0068] FIG. 6 schematically illustrates an example of the relationship between the press-in distance and the insertion load of the ventilation member (10) when the ventilation member (10) is installed in the opening (21) of the housing (20). In addition, FIG. 7a to 7e schematically illustrate the deformation process of the ventilation member (10) during the installation operation of the ventilation member (10).

[0069] After the insertion of the ventilation member (10) begins, at the stage where the leg portion (35) of the ventilation member (10) contacts the inclined surface (23) of the opening (21) (Fig. 7a), a load required for insertion, i.e., an insertion load, is generated (Fig. 6, Point A). Subsequently, as the amount of deformation of the leg portion (35) increases with increasing insertion distance, the insertion load gradually increases. In the illustrated example, the opening (21) has a tapered portion followed by a portion of uniform diameter. Because of this, at the stage where the hook portion (37) is inserted up to the portion of uniform diameter (not illustrated), the insertion load required for the insertion of the leg portion (35) begins to decrease (Fig. 6, Point P).

[0070] After that, when the hook portion (37) is caught on the inner surface (26) of the housing (20) and begins to return inward (between FIG. 7b and FIG. 7c), the insertion load required for the deformation of the leg portion (35) is further reduced and reaches a minimum value (Fig. 6, point B). If the press-fit distance is made larger, the load required for the deformation of the seal ring (8) increases, and the insertion load increases (Fig. 6, point C).

[0071] However, at this stage, the leg portion (35) is still tilted toward the inner side, and the hook portion (37) is not in sufficient contact with the inner surface (26) of the housing (20). Because of this, the press-fitting of the ventilation member (10) continues. During this press-fitting process, the ventilation member (10) is pressed further until the lower surface (34) of the base portion (33) approaches the outer surface (24) of the housing (20) and, in some cases, comes into contact with each other. As a result, the leg portion (35) is in the intended position, and the hook portion (37) is in sufficient contact with the inner surface (26) (Fig. 7d). During this additional press-fitting process, the seal ring (8) is further compressed, and the insertion load increases rapidly (Fig. 6 point D). Afterward, the press-fitting load is released, and the installation of the ventilation member (10) is completed (Fig. 7e).

[0072] Because extra pressing is required, the repulsive force FO and fo of the seal ring (8) is more likely to affect the maximum value of the insertion load than the bending force FL of the leg portion (35). To control the insertion load, the repulsive force FO and fo can be adjusted. The insertion load is significantly reduced when the repulsive force FO and fo is 30N or less.

[0073] From the above embodiments, the following technology is provided.

[0074] (Technology 1)

[0075] A ventilation member and a housing in which the ventilation member is installed in an opening are provided.

[0076] The above-mentioned ventilation member is,

[0077] A support body comprising a base portion having a through hole and a plurality of leg portions extending from the base portion to surround a ventilation passage communicating with the through hole, wherein each of the plurality of leg portions has a hook portion protruding from the outer surface of said leg portion,

[0078] A sealing ring is provided to seal the space between the housing and the support while in contact with the plurality of leg portions, and

[0079] At least a portion of the above opening is tapered, and

[0080] The seal ring is pressed against the inclined surface of the tapered inner circumference of the opening, and the hook portion is in contact with the inner surface of the housing, and the ventilation member is installed in the opening.

[0081] The repulsive force FO of the seal ring and the bending force FL of the leg part satisfy equations (1) and (2),

[0082] Breathable housing.

[0083]

[0084] However, n is the number of the plurality of leg parts and is an integer greater than or equal to 2, and

[0085] The above repulsive force FO is the repulsive force of the seal ring when the above ventilation member is pressed into the installation position in the opening while only the seal ring is pressed against the inclined surface, with the tip of the leg portion removed so that the leg portion does not come into contact with the housing.

[0086] The above bending force FL is the bending force of the leg portion required to bend the leg portion by pressing the hook portion from the outer surface side, with the protrusion height of the hook portion from the outer surface as the amount of pressing.

[0087] (Technology 2)

[0088] A ventilation housing of Tech 1 in which the above repulsive force FO further satisfies Equation (3).

[0089]

[0090] (Technique 3)

[0091] A ventilation housing of technology 1 or 2 in which the above repulsive force FO further satisfies formula (4).

[0092]

[0093] (Technique 4)

[0094] A ventilation housing of any one of techniques 1 to 3 that satisfies formula (5) instead of formula (2).

[0095]

[0096] (Technique 5)

[0097] It is a ventilation member that can be installed in an opening of a housing, and

[0098] A support body comprising a base portion having a through hole and a plurality of leg portions extending from the base portion to surround a ventilation passage communicating with the through hole, wherein each of the plurality of leg portions has a hook portion protruding from the outer surface of said leg portion,

[0099] When installed in the above opening, it is provided with a sealing ring that seals the space between the housing and the support while in contact with the plurality of leg portions, and

[0100] The repulsive force fo of the above seal ring and the bending force FL of the above leg part satisfy equations (11) and (12),

[0101] Lack of ventilation.

[0102]

[0103] However, n is the number of the plurality of leg parts, and

[0104] The above repulsive force fo is the repulsive force of the seal ring when only the seal ring is pressed against the inclined surface, with the tip of the leg removed so that the leg does not come into contact with the housing, until the gap between the surface of a test plate having a tapered opening with an inclined surface of 60 degrees formed on the inner circumference and a maximum diameter matching the outer diameter of the seal ring and the base part becomes 0.5 mm.

[0105] The above bending force FL is the bending force of the leg portion required to bend the leg portion by pressing the hook portion from the outer surface side, with the protrusion height of the hook portion from the outer surface as the amount of pressing.

[0106] (Technique 6)

[0107] The above repulsive force fo further satisfies Equation (13), a ventilation member of Technique 5.

[0108]

[0109] (Technique 7)

[0110] A ventilation member of technique 5 or 6 in which the above repulsive force fo further satisfies formula (14).

[0111]

[0112] (Technique 8)

[0113] A ventilation member of any one of techniques 5 to 7 that satisfies formula (15) instead of formula (12).

[0114]

[0115] The present embodiment will be explained in more detail below through examples and comparative examples.

[0116] In the examples and comparative examples, the ventilation member and housing described with reference to FIGS. 1 to 3 were manufactured, and a ventilation housing was obtained. Additionally, the base part (33) including the leg part (35) of the ventilation member (10) was made using polybutylene terephthalate ("PBT-GF30" manufactured by Toray Corporation) containing glass fibers, and the housing (20) was made using stainless steel (SUS).

[0117] (Example 1)

[0118] As a seal ring (8), a silicone O-ring was used. For the O-ring, the outer diameter DS was 11.6 mm, the inner diameter was 7.8 mm, the wire diameter was 1.9 mm, and the Shore hardness A was 70. For the ventilation member (10), the number n of the leg portion (35) was 3, the length LL of the leg portion (35) was 4.05 mm, the diameter DC determined by the tip of the hook portion (37) was 10.2 mm, the diameter DL determined by the outer circumference (36) of the leg portion (35) was 8.0 mm, and the height LC of the hook portion (37) was 1.1 mm. The inner circumference end (35e) of the leg portion (35) was flattened. The flattening was performed so that the end of the flat surface coincided with the outer circumference end (35f) of the leg portion (35). With respect to the housing (20), the maximum diameter DH of the opening (21) is 11.5 mm, the slope angle θ of the inclined surface (23) is 60 degrees, the wall thickness LB of the housing (20) is 3.5 mm, and the length of the vertical surface (28) is 0.7 mm. The compression ratio of the O-ring in Example 1 is 24%.

[0119] (Example 2)

[0120] As a seal ring (8), a silicone O-ring was used. For the O-ring, the outer diameter DS was 11.6 mm, the inner diameter was 7.8 mm, the wire diameter was 1.8 mm, and the Shore hardness A was 70. For the ventilation member (10), the number n of the leg portion (35) was 3, the length LL of the leg portion (35) was 4.1 mm, the diameter DC determined by the tip of the hook portion (37) was 10.3 mm, the diameter DL determined by the outer surface (36) of the leg portion (35) was 7.9 mm, and the height LC of the hook portion (37) was 1.2 mm. The inner circumferential end (35e) of the leg portion (35) was flattened. The flattening was performed so that the end of the flat surface coincided with the outer circumferential end (35f) of the leg portion (35). With respect to the housing (20), the maximum diameter DH of the opening (21) is 11.6 mm, the slope angle θ of the inclined surface (23) is 60 degrees, the wall thickness LB of the housing (20) is 3.4 mm, and the length of the vertical surface (28) is 0.6 mm. The compression ratio of the O-ring in Example 2 is 16%.

[0121] (Example 3)

[0122] As a seal ring (8), a silicone O-ring was used. For the O-ring, the outer diameter DS was 11.4 mm, the inner diameter was 7.8 mm, the wire diameter was 2.0 mm, and the Shore hardness A was 70. For the ventilation member (10), the number n of the leg portion (35) was 3, the length LL of the leg portion (35) was 4 mm, the diameter DC determined by the tip of the hook portion (37) was 10.1 mm, the diameter DL determined by the outer surface (36) of the leg portion (35) was 8.1 mm, and the height LC of the hook portion (37) was 1.0 mm. The inner circumferential end (35e) of the leg portion (35) was flattened. The flattening was performed so that the end of the flat surface coincided with the outer circumferential end (35f) of the leg portion (35). With respect to the housing (20), the maximum diameter DH of the opening (21) is 11.4 mm, the slope angle θ of the inclined surface (23) is 60 degrees, the wall thickness LB of the housing (20) is 3.6 mm, and the length of the vertical surface (28) is 0.8 mm. The compression ratio of the O-ring in Example 3 is 33%.

[0123] (Example 4)

[0124] Regarding the seal ring (8), it was done in the same manner as Example 2, except that a silicone O-ring with a Shore hardness A of 3 was used.

[0125] (Comparative Example 1)

[0126] Regarding the seal ring (8), it was done in the same manner as Example 2, except that a silicone O-ring with a Shore hardness A of 80 was used.

[0127] (Comparative Example 2)

[0128] With respect to the ventilation member (10), it was done in the same manner as Example 3, except that the inner circumferential end (35e) of the leg portion (35) was not flattened.

[0129] For the examples and comparative examples, the repulsion force FO of the seal ring (8) and the bending force FL of the leg portion (35) were measured by the measurement method described above. In addition, the following tests were performed. The results are shown in Table 1.

[0130] (Thermal cycle test)

[0131] A thermal cycle test was performed on a test specimen in which a ventilation member (10) was inserted into and fixed in the opening (21) of a housing (20). In the thermal cycle test, a cycle of maintaining the ventilation member (10) in an atmosphere of -40°C and 125°C for 1 hour each was repeated 500 times. After the test, if the ventilation member (10) was retained and supported in the opening (21), it was marked as OK, and if it fell out of the opening (21), it was marked as NG.

[0132] (Insertion test / Crack resistance)

[0133] For a test specimen in which a ventilation member (10) was inserted into the opening (21) of a test plate and fixed, the leg portion (35) was observed by magnifying it with a magnifying glass from the other side of the test plate. If no cracks were observed at all, including fine cracks, it was considered OK, and otherwise it was considered NG.

[0134] (Insertion load measurement)

[0135] The maximum insertion force (insertion load) required when installing the ventilation member (10) in the opening (21) was measured. The insertion speed of the ventilation member (10) was set to 10 mm / min. In this test, insertion was continued until the hook portion (37) of the leg portion (35) was completely caught in the opening of the housing and stopped.

[0136]

[0137] In Comparative Example 2, an extremely minute crack was observed in the leg portion. Additionally, in Table 1, the insertion load (N) of Example 4 is a calculated value (3FL) based on the leg portion bending force FL, not a measured value. However, in Example 4, it can be confirmed that the leg portion bending force FL is sufficiently greater than the sealing ring FO, and the insertion load is determined according to FL. For this reason, the measured value of the insertion load is thought to be approximately 81N.

Claims

Claim 1 A ventilation housing comprising a ventilation member and a housing in which the ventilation member is installed in an opening, wherein the ventilation member comprises a base portion having a through hole and a plurality of leg portions extending from the base portion to surround a ventilation passage communicating with the through hole, and each of the plurality of leg portions has a hook portion protruding from the outer surface of said leg portion and a seal ring sealing the housing and the support member while in contact with the plurality of leg portions, wherein at least a portion of the opening is tapered, and the seal ring is pressed against the tapered inner circumferential inclined surface of the opening, and the ventilation member is installed in the opening while the hook portion is in contact with the inner surface of the housing, and wherein the repulsion force FO of the seal ring and the bending force FL of the leg portion satisfy Equations (1) and (2). However, n is the number of the plurality of leg portions, and the repulsion force FO is the repulsion force of the seal ring when the ventilation member is pressed into the installation position in the opening while only the seal ring is pressed against the inclined surface, with the tip side of the leg portion removed so that the leg portion does not come into contact with the housing, and the bending force FL is the repulsion force of the leg portion when the leg portion is bent by pressing the hook portion from the outer surface side, with the protrusion height of the hook portion from the outer surface as the pressing amount. Claim 2 In claim 1, the above-mentioned repulsive force FO further satisfies Equation (3), a ventilation housing. Claim 3 In claim 1, the above repulsive force FO further satisfies Equation (4), a ventilation housing. Claim 4 A ventilation housing that satisfies Equation (5) instead of Equation (2) in the first paragraph. Claim 5 A ventilation member that can be installed in an opening of a housing, comprising a base portion having a through hole and a plurality of leg portions extending from the base portion to surround a ventilation passage communicating with the through hole, wherein each of the plurality of leg portions has a hook portion protruding from the outer surface of said leg portion, and a seal ring that seals the housing and the support member while in contact with the plurality of leg portions when installed in the opening, wherein the repulsion force fo of the seal ring and the bending force FL of the leg portions satisfy equations (11) and (12). However, n is the number of the plurality of leg portions, and the repulsion force fo is the repulsion force of the seal ring when only the seal ring is pressed against the inclined surface, with the tip side of the leg portion removed so that the leg portion does not come into contact with the test plate, until the gap between the surface of the test plate having a tapered opening with an inclined surface of 60 degrees and a maximum diameter matching the outer diameter of the seal ring and the base portion becomes 0.5 mm, and the bending force FL is the repulsion force of the leg portion required to bend the leg portion by pressing the hook portion from the outer surface side, with the protrusion height of the hook portion from the outer surface as the pressing amount. Claim 6 In paragraph 5, the above repulsive force fo further satisfies Equation (13), a ventilation member. Claim 7 In paragraph 5, the above repulsive force fo further satisfies Equation (14), a ventilation member. Claim 8 In paragraph 5, a ventilation member satisfying formula (15) instead of formula (12).

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