JP2014120579A - Waterproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof structure in which decrease in waterproofness is suppressed by suppressing deterioration of an O-ring.SOLUTION: A waterproof structure includes a case (10) in which a communication hole (12) is formed, and a waterproof member (30) provided in the communication hole. The waterproof member includes a breathing filter (40), an installation member (50), a protection member (60). The installation member includes a cylinder part (51) which is provided in the communication hole, and whose opening is blocked by the breathing filter, a hook part (52) provided on the end of the cylinder part positioned inside the case, an annular part (53) provided on the end of the cylinder part positioned outside the case, and an O-ring (54) held between the annular part and the case. The protection member includes an annular side wall (61) surrounding the O-ring and a lid part (62) for blocking an opening apart from the case out of two openings constituted by the side wall. An irregularity (70) for being joined together is formed on the side wall and the outer wall of the case.

Description

  The present invention relates to a waterproof structure having a casing in which a communication hole that communicates the inside and the outside is formed, and a waterproof member provided in the communication hole of the casing.

  Conventionally, for example, as shown in Patent Document 1, a power conversion device in which an electronic component group is accommodated in a case is known. A vent hole communicating with the inside and outside of the case and a waterproof wall protruding from the case side wall are formed on the case side wall. A vent plug is disposed in the vent hole described above, and the vent plug is surrounded by a waterproof wall. The waterproof wall prevents water flying along the side wall of the case from directly hitting the vent plug.

  The vent plug includes an insertion portion provided in the ventilation hole and a cover that covers a case outer end of the insertion portion. The insertion part is formed in a cylindrical shape, and a claw part and a support part are formed at both ends thereof. The claw portion is located inside the case and extends radially from the periphery of the cylindrical insertion portion, and the support portion is located outside the case and extends radially outward from the entire periphery of the insertion portion. ing. The claw portion is bent in the axial direction when inserted into the vent hole of the vent plug.

  On the case side of the support portion, an annular concave groove is formed over the entire circumference, and a rubber O-ring seal is disposed in close contact with the case side wall. Further, a ventilation filter made of a member having air permeability and waterproofness is adhered and disposed on the opposite side of the support portion, and the opening of the insertion portion is covered by the ventilation filter.

  The cover has an opposing wall that faces the ventilation filter, and a cover side wall that is connected to the peripheral edge of the support portion continuously from the peripheral edge of the opposing wall.

  As described above, the vent plug is surrounded by the waterproof wall. Thereby, the water flying toward the vent plug is prevented from directly hitting the O-ring seal.

JP 2011-147261 A

  Incidentally, in the configuration described in Patent Document 1, a gap is generated between the vent plug and the waterproof wall. The gap opens in the height direction perpendicular to the case side wall, and communicates the O-ring and the external atmosphere. Therefore, when water flowing in the height direction hits the vent plug, the water enters the gap between the vent plug and the waterproof wall, and the water contacts the O-ring. Thereby, there exists a possibility that an O-ring may deteriorate. When the O-ring deteriorates, water may enter the inside of the case through a minute gap between the insertion portion and the wall constituting the ventilation hole due to surface roughness.

  Then, in view of the said problem, this invention aims at providing the waterproof structure by which deterioration of waterproofness was suppressed by suppressing deterioration of an O-ring.

  In order to achieve the above-described object, the present invention is provided in a housing (10) in which a communication hole (12) communicating the inside and the outside is formed in the outer wall (11), and in the communication hole of the housing. A waterproof structure having a waterproof member (30), the waterproof member comprising a breathing filter (40) having waterproofness and air permeability, an installation member (50) for installing the breathing filter in the communication hole, A protective member (60) that is connected to the installation member and protects the breathing filter, and the installation member communicates so that the wall surface (12a) that constitutes the communication hole and the outer surface (51a) thereof are in contact with each other. A cylindrical portion (51) provided in the hole and having one of the two openings closed by a breathing filter, and of the two ends of the cylindrical portion, the end located inside the casing A collar part (52) provided on the outer surface and two end parts of the cylindrical part An annular portion (53) provided on the outer surface of the end located outside the housing, an annular lower surface (53a) facing the outer wall surface (11b) of the housing in the annular portion, and an outer wall surface of the housing Between the annular lower surface and the annular outer wall surface (11c) facing the annular lower surface and the annular outer wall surface due to the stress generated when the collar portion comes into contact with the inner wall surface (11a) of the outer wall and bends. An O-ring (54) sandwiched between the annular portion and the housing, and the protective member includes an annular side wall (61) surrounding each of the annular portion and the O-ring; A lid portion (62) that closes the opening portion away from the housing among the two opening portions, and an end portion (61a) facing the housing on the side wall, and facing the end portion Concavities and convexities (70) to be combined with each other are formed on the outer wall of the housing. And features.

  Thus, according to the present invention, the protective member (60) includes the annular side wall (61) surrounding the annular portion (53) and the O-ring (54), and the two openings formed by the side wall (61). A lid portion (62) that closes an opening away from the housing (10), and an end portion (61a) facing the housing (10) on the side wall (61), On the outer wall (11) of the housing (10) facing the part (61a), there are formed irregularities (70) for combining with each other. According to this, even if the water flowing in the height direction orthogonal to the outer wall surface (11b) of the housing (10) hits the waterproof member (30), the water may contact the O-ring (54). It is suppressed. Further, as compared with a configuration in which the unevenness (70) is not formed on the end portion (61a) and the outer wall (11), the O-ring from the external atmosphere in the space between the end portion (61a) and the outer wall (11). The distance to reach the space provided with (54) (the space between the annular lower surface (53a) and the annular outer wall surface (11b)) becomes longer. Thereby, deterioration of the O-ring (54) due to contact with water is suppressed, and the outer surface (51a) of the cylindrical portion (51) and the wall surface (12a) constituting the communication hole (12) due to surface roughness It is possible to prevent water from entering the inside of the housing (10) through the minute gap between the two. As a result, a decrease in waterproofness is suppressed.

  In the present invention, the length (L1) of the unevenness formed on the end portion of the side wall and the outer wall of the housing in the height direction perpendicular to the outer wall surface of the housing is the same as the annular portion and the housing in the height direction. A configuration shorter than the length (L2) between the body and the outer wall is preferable. According to this, compared with the structure where the length of the unevenness in the height direction is longer than the length between the annular portion in the height direction and the outer wall of the housing, the housing (10) in the unevenness (70) The length of the height direction of the site | part formed in an outer wall (11) becomes short. Therefore, unlike the configuration in which a waterproof wall longer than the length between the annular portion and the casing is formed on the casing, the casing (10) can be formed by pressing or the like. Thereby, a housing | casing (10) can be manufactured cheaply.

  In the present invention, it is preferable that the O-ring is isolated from the external atmosphere by the elastic member (73) provided on the unevenness. According to this, even if the water flowing in any direction hits the waterproof member (30), the contact between the O-ring (54) and the water is suppressed. Therefore, the deterioration of the O-ring (54) is suppressed, and the decrease in waterproofness is suppressed.

  In the above invention, the elastic member preferably has adhesiveness, and the protective member and the casing are preferably bonded by the elastic member. According to this, compared with the structure in which the elastic member (73) does not have adhesiveness, the O-ring (54) is hardly exposed to the external atmosphere. Therefore, deterioration of the O-ring (54) due to contact with water is suppressed, and a decrease in waterproofness is suppressed.

It is sectional drawing which shows schematic structure of the waterproof structure which concerns on 1st Embodiment. It is sectional drawing which shows schematic structure of the waterproof structure which concerns on 2nd Embodiment. It is sectional drawing which shows schematic structure of the waterproof structure which concerns on 3rd Embodiment. It is sectional drawing which shows schematic structure of the waterproof structure which concerns on 4th Embodiment. It is sectional drawing which shows schematic structure of the waterproof structure which concerns on 5th Embodiment. It is sectional drawing which shows schematic structure of the waterproof structure which concerns on 6th Embodiment. It is sectional drawing which shows the modification of a waterproof structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
Based on FIG. 1, the waterproof structure which concerns on this embodiment is demonstrated. In FIG. 1, for convenience, a boundary between a cylinder part 51 and a flange part 52 and a boundary between the cylinder part 51 and the annular part 53, which will be described later, are indicated by broken lines. Further, a communication hole 12 described later is surrounded by a two-dot chain line.

  In the following, the three directions orthogonal to each other are indicated as an x direction, a y direction, and a z direction. A plane defined by the x direction and the y direction is referred to as an xy plane, and a plane defined by the z direction and the x direction is referred to as a zx plane. Incidentally, the y direction described above corresponds to the height direction described in the claims.

  As shown in FIG. 1, the waterproof structure 100 includes a housing 10 containing an ECU and the like, and a waterproof member 30 as main parts. A communication hole 12 is formed in the outer wall 11 of the housing 10 to communicate the inside and the outside of the housing 10, and a waterproof member 30 is provided in the communication hole 12. The axial direction of the communication hole 12 is along the y direction, and this axial direction coincides with the central axis that penetrates the waterproof member 30 in the y direction. In the following, as indicated by a one-dot chain line in FIG. 1, the axial direction of the communication hole 12 and the central axis that penetrates the waterproof member 30 in the y direction are collectively referred to as a reference line BL. Incidentally, the waterproof member 30 has a line-symmetric shape via the reference line BL in the xy plane including the reference line BL.

  The waterproof member 30 includes a breathing filter 40, an installation member 50, and a protection member 60. The breathing filter 40 is made of a material having waterproofness and air permeability, and waterproofs the inside and outside of the housing 10 in communication. The installation member 50 installs the respiratory filter 40 in the communication hole 12. The protection member 60 is connected to the installation member 50 to protect the respiratory filter 40.

  The installation member 50 includes a cylinder part 51, a flange part 52, an annular part 53, and an O-ring 54. The cylindrical portion 51 is provided in the communication hole 12, and the wall surface 12 a constituting the communication hole 12 and the outer side surface 51 a thereof are in surface contact. As a result, the outside and the inside of the housing 10 can communicate with each other through the hole formed by the inner side surface 51 b of the cylindrical portion 51. The cylindrical portion 51 has two openings, and the opening located outside the housing 10 among these two openings is closed by the breathing filter 40 described above. Thereby, the inside and the outside of the housing 10 can communicate with each other via the breathing filter 40 and the cylinder portion 51.

  The flange portion 52 is provided on the outer side surface 51 a of the end portion located inside the housing 10 among the two end portions of the cylindrical portion 51. The flange portion 52 has an annular shape, an inner ring surface thereof is connected to the tube portion 51, and an outer ring surface thereof is exposed to the internal atmosphere of the housing 10. Further, the facing surface 52a of the flange portion 52 facing the outer wall 11 of the housing 10 has a planar shape along the xz plane and is in surface contact with the inner wall surface 11a of the outer wall 11. As shown in FIG. 1, the outer diameter of the flange portion 52 is constant for a predetermined distance in the direction from the communication hole 12 toward the inside of the housing 10 (hereinafter referred to as the inner direction) along the reference line BL. , Gradually getting shorter. Therefore, a part of the outer ring surface of the flange portion 52 is inclined so that the outer diameter is narrowed in the inner direction.

  The annular portion 53 is provided on the outer side surface 51 a of the end portion located outside the housing 10 out of the two end portions of the cylindrical portion 51. The annular portion 53 has an annular shape as the name suggests, and an inner ring surface thereof is connected to the cylindrical portion 51, and an outer ring surface thereof is in contact with the protective member 60. Further, the annular lower surface 53 a of the annular portion 53 facing the outer wall surface 11 b of the outer wall 11 has a planar shape along the xz plane and is in contact with the O-ring 54. As shown in FIG. 1, after the outer diameter of the annular portion 53 becomes constant for a predetermined distance in a direction from the communication hole 12 toward the outside of the housing 10 (hereinafter referred to as an outward direction) along the reference line BL. , Gradually getting shorter. Therefore, a part of the outer ring surface of the annular portion 53 is inclined so that the outer diameter is narrowed in the outer direction.

  The O-ring 54 seals the gap between the outer side surface 51 a of the cylindrical portion 51 and the wall surface 12 a of the communication hole 12 due to the surface roughness while fixing the cylindrical portion 51 to the communication hole 12. As shown in FIG. 1, the O-ring 54 is disposed between the annular lower surface 53a and the annular outer wall surface 11c facing the annular lower surface 53a in the outer wall surface 11b. The O-ring 54 comes into contact with the annular lower surface 53a and the annular outer wall surface 11c due to the stress generated when the cylindrical portion 51 is inserted into the communication hole 12 and the flange portion 52 comes into contact with the inner wall surface 11a and bends. However, it is sandwiched between the annular portion 53 and the outer wall 11. Thereby, the cylinder part 51 is fixed to the communication hole 12. Further, the contact pressure between the O-ring 54 and the annular portion 53 and between the O-ring 54 and the outer wall 11 is ensured, and the gap between the outer side surface 51a and the wall surface 12a is sealed.

  The protective member 60 includes an annular side wall 61 that surrounds the periphery of the annular part 53 and the O-ring 54, a lid part 62 that closes an opening part away from the housing 10 out of two openings formed by the side wall 61, Have As shown in FIG. 1, the outer diameter of the side wall 61 is constant, and the outer surface of the side wall 61 is along the y direction. A locally recessed portion 63 is formed on the inner surface of the side wall 61. When the protective member 60 is inserted into the annular portion 53 so as to cover the respiratory filter 40 and the annular portion 53 with the side wall 61 and the lid portion 62, the locally recessed portion 63 is fitted into the annular portion 53 and protected. The member 60 is fixed to the cylinder portion 51. Thereby, the respiratory filter 40 is protected by the protective member 60.

  As shown in FIG. 1, a ventilation hole 64 is formed in the side wall 61. Therefore, the inside and the outside of the housing 10 can communicate with each other via the vent hole 64, the breathing filter 40, and the cylinder portion 51. The ventilation hole 64 has an opening that opens to the installation member 50 side, and an opening that opens to the external atmosphere. An opening portion that opens to the installation member 50 side in the vent hole 64 faces the installation member 50 in the axial direction of the vent hole 64. It should be noted that product information of the waterproof member 30 is engraved on the outer surface of the lid 62 by a laser or the like.

  Next, features of the waterproof structure 100 according to the present embodiment will be described. As shown in FIG. 1, the end portion 61 a that faces the housing 10 on the side wall 61 of the protective member 60 and the outer wall 11 of the housing 10 that faces the end portion 61 a have unevenness 70 for being combined with each other. Is formed. Specifically, a convex portion 71 protruding toward the housing 10 is formed on the end portion 61a, a concave portion 72 that is locally recessed is formed on the outer wall 11, and the convex portion 71 and the concave portion 72 are combined. Asperities 70 are formed. Each of the convex portion 71 and the concave portion 72 has an annular shape in the zx plane.

  In the present embodiment, one convex portion 71 is formed at the end portion 61 a and one concave portion 72 is formed on the outer wall 11. Further, as shown in FIG. 1, the length L1 of the unevenness 70 in the y direction is shorter than the length L2 between the annular portion 53 and the outer wall 11 in the y direction.

  Next, the function and effect of the waterproof structure 100 according to this embodiment will be described. As described above, the protective member 60 closes the annular side wall 61 that surrounds the periphery of the annular portion 53 and the O-ring 54, and the opening portion that is separated from the housing 10 among the two openings that the sidewall 61 constitutes. The end portion 61a of the side wall 61 facing the housing 10 and the outer wall 11 of the housing 10 facing the end portion 61a are formed with concavities and convexities 70 for combining with each other. ing. According to this, even if the water flowing in the y direction hits the waterproof member 30, the water is suppressed from contacting the O-ring 54. Further, as compared with a configuration in which the unevenness 70 is not formed on the end portion 61a and the outer wall 11, a space (annular lower surface 53a) in which the O-ring 54 is provided from the external atmosphere in the space between the end portion 61a and the outer wall 11. And the distance between the outer wall surface 11c and the annular outer wall surface 11c is increased. Thereby, the deterioration of the O-ring 54 due to contact with water is suppressed, and the housing 10 has a gap between the outer surface 51a of the cylindrical portion 51 and the wall surface 12a of the communication hole 12 due to surface roughness. Ingress of water is suppressed. As a result, a decrease in waterproofness is suppressed.

  The length L1 of the unevenness 70 in the y direction is shorter than the length L2 between the annular portion 53 and the outer wall 11 in the y direction. According to this, compared with the configuration in which the length of the unevenness in the y direction is longer than the length between the annular portion and the outer wall in the y direction, the portion (recess 72) formed in the outer wall 11 of the housing 10 in the unevenness 70. ) In the y direction is shortened. Therefore, unlike the configuration in which a waterproof wall longer than the length between the annular portion and the casing is formed in the casing, the casing 10 can be formed by pressing or the like. Thereby, the housing | casing 10 can be manufactured cheaply.

  An opening portion that opens to the installation member 50 side in the ventilation hole 64 faces the installation member 50 in the axial direction of the ventilation hole 64. According to this, it is suppressed that the water which penetrate | invaded the ventilation hole 64 hits the respiratory filter 40 directly. Thereby, the fall of the waterproofing property by the failure | damage of the respiratory filter 40 is suppressed.

  The facing surface 52a facing the outer wall 11 of the casing 10 in the flange portion 52 has a planar shape along the xz plane, and is in surface contact with the inner wall surface 11a of the outer wall 11. According to this, compared with the structure in which the collar part and the outer wall are in line contact, the collar part 52 is less likely to be detached from the outer wall 11 due to external stress or the like.

  The outer ring surface of the flange portion 52 is inclined so that the outer diameter is narrowed in the inner direction. Therefore, it is easy to insert the flange portion 52 into the communication hole 12 of the outer wall 11 when inserting the cylindrical portion 51 into the communication hole 12. Thereby, the installation of the installation member 50 to the communication hole 12 is facilitated.

  The outer ring surface of the annular portion 53 is inclined so that the outer diameter is narrowed in the outer direction. Therefore, when connecting the protection member 60 to the installation member 50, the annular portion 53 can be easily inserted into the locally recessed portion 63 of the side wall 61. Thereby, the assembly of the protection member 60 to the installation member 50 is facilitated.

(Second Embodiment)
Next, a second embodiment of the present invention will be described based on FIG. Since the waterproof structure 100 according to the second embodiment is often in common with that according to the first embodiment, a detailed description of the common parts will be omitted below, and different parts will be mainly described. In the following, the same reference numerals are given to the same elements as those shown in the first embodiment.

  In the first embodiment, as shown in FIG. 1, an example in which the O-ring 54 is connected to the external environment via the unevenness 70 has been described. On the other hand, in this embodiment, as shown in FIG. 2, the elastic member 73 is provided in the unevenness | corrugation 70, and the O-ring 54 is isolated from external atmosphere. According to this, even if the water flowing in any direction hits the waterproof member 30, the contact between the O-ring 54 and the water is suppressed. For this reason, the deterioration of the O-ring 54 is suppressed, and a decrease in waterproofness is suppressed.

  Further, the elastic member 73 described above has adhesiveness, and the protective member 60 and the housing 10 are bonded by the elastic member 73. According to this, the O-ring 54 is less likely to be exposed to the external atmosphere as compared with a configuration in which the elastic member does not have adhesiveness. Therefore, deterioration of the O-ring 54 due to contact with water is suppressed, and a decrease in waterproofness is suppressed.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. Since the waterproof structure according to the third embodiment is in common with those according to each of the above-described embodiments, detailed description of the common parts will be omitted below, and different parts will be described mainly.

  In the second embodiment, as shown in FIG. 2, the outer diameter of the side wall 61 is constant, and the outer surface of the side wall 61 is along the y direction. On the other hand, in this embodiment, as shown in FIG. 3, the outer surface of the side wall 61 is inclined so that the outer diameter of the side wall 61 becomes longer toward the housing 10. According to this, when a stress is applied to the side wall 61, the stress is divided into a direction toward the housing 10 and a direction along the outer wall 11 of the housing 10. Thereby, the protection member 60 is pressed against the housing 10 side. Therefore, the O-ring 54 is stronger than when no stress is applied to the side wall 61 and is sandwiched between the housing 10 and the annular portion 53. As a result, the sealing performance of the minute gap between the outer surface 51a and the wall surface 12a by the O-ring 54 is improved, and water can be prevented from entering the inside of the housing 10 through the minute gap. .

  Further, when water flows to the lid portion 62 of the protection member 60, the water easily flows to the outer wall surface 11 b of the housing 10 through the side wall 61. Therefore, water can be prevented from entering the unevenness 70. As a result, deterioration of the O-ring 54 due to contact with water is suppressed, and a decrease in waterproofness is suppressed.

(Fourth embodiment)
Next, 4th Embodiment of this invention is described based on FIG. Since the waterproof structure according to the fourth embodiment is often in common with that according to each of the embodiments described above, detailed description of the common parts will be omitted, and different parts will be described mainly.

  In the third embodiment, as shown in FIG. 3, an example in which one convex portion 71 is formed at the end portion 61 a and one concave portion 72 is formed on the outer wall 11 is shown. On the other hand, in this embodiment, as shown in FIG. 4, a plurality of convex portions 71 having different lengths are formed on the end portion 61a, and a plurality of concave portions 72 having different depths are formed on the outer wall 11. According to this, as compared with the configuration described in the third embodiment, the distance from the external atmosphere in the unevenness 70 to the space where the O-ring 54 is provided becomes longer. Therefore, it is possible to prevent water from coming into contact with the O-ring 54 through the unevenness 70. As a result, the deterioration of the O-ring 54 is suppressed, and the decrease in waterproofness is suppressed. The lengths of the plurality of convex portions 71 may be equal to each other, and the depths of the plurality of concave portions 72 may be equal to each other.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. Since the waterproof structure according to the fifth embodiment is often in common with that according to each of the embodiments described above, detailed description of the common parts will be omitted, and different parts will be described mainly.

  In 4th Embodiment, as shown in FIG. 4, the outer wall surface 11b of the outer wall 11 in which the communicating hole 12 is formed showed the example which follows an xz plane. On the other hand, in the present embodiment, as shown in FIG. 5, the protruding portion 13 is located at a position farther from the communication hole 12 than the portion of the outer wall surface 11 b of the housing 10 facing the end portion 61 a of the side wall 61. Is formed. The protrusion 13 has an annular shape in the zx plane so as to surround the waterproof member 30. According to this, the protrusion 13 suppresses the water flowing on the outer wall surface 11 b from entering the unevenness 70. Therefore, deterioration of the O-ring 54 due to contact with water is suppressed, and a decrease in waterproofness is suppressed.

  Although not shown, the protrusion 13 is formed with a cut, and the zx plane has an annular shape having at least one gap. Thereby, even if water permeates into the unevenness 70 via the protrusion 13, the water is discharged to the external atmosphere via the cut. Thereby, contact with O-ring 54 and water is controlled, deterioration of O-ring 54 by contact with water is controlled, and a waterproof fall is controlled.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. Since the waterproof structure according to the sixth embodiment is often in common with the above-described embodiments, detailed description of the common parts will be omitted, and different parts will be described mainly.

  In the fifth embodiment, an example in which the outer surface of the side wall 61 is inclined so that the outer diameter of the side wall 61 becomes shorter toward the housing 10 has been described. On the other hand, in the present embodiment, as shown in FIG. 6, an annular ridge 65 is provided on the outer surface of the side wall 61, and the ridge 65 and the protrusion 13 allow water to enter the unevenness 70. In order to prevent this, they are opposed to each other through a gap in the y direction. The flange 65 has an annular shape in the zx plane, and is inclined on the outer surface so that its outer diameter becomes longer as it approaches the housing 10. According to this, the intrusion of water into the unevenness 70 is suppressed by the flange 65 and the protrusion 13. Therefore, deterioration of the O-ring 54 due to contact with water is suppressed, and a decrease in waterproofness is suppressed.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the first embodiment, the convex portion 71 is formed on the end portion 61 a of the side wall 61, the concave portion 72 is formed on the outer wall 11 of the housing 10, and the concave and convex portion 70 is formed by combining the convex portion 71 and the concave portion 72. An example was given. However, as shown in FIG. 7, the concave portion 74 is formed on the end portion 61 a of the side wall 61, the convex portion 75 is formed on the outer wall 11 of the housing 10, and the concave portion 74 and the convex portion 75 are combined, thereby forming irregularities. A configuration in which 70 is formed can also be adopted. As described above, the convex portion 71 is formed on one of the end portion 61 a and the outer wall 11, the concave portion 72 is formed on the other of the end portion 61 a and the outer wall 11, and the convex portion 71 and the concave portion 72 are combined. Is formed. In the case of the configuration illustrated in FIG. 7, although not illustrated, a configuration in which a plurality of concave portions 74 are formed in the end portion 61 a and a plurality of convex portions 75 are formed in the outer wall 11 may be employed. According to this, compared with the configuration in which one concave portion is formed at the end and one convex portion is formed on the outer wall, the distance from the external atmosphere in the unevenness 70 to the space where the O-ring 54 is provided is reduced. become longer. Therefore, it is possible to prevent water from coming into contact with the O-ring 54 through the unevenness 70. As a result, the deterioration of the O-ring 54 is suppressed, and the decrease in waterproofness is suppressed.

  In 1st Embodiment, the collar part 52 showed the example which is cyclic | annular. However, the flange portion 52 is not limited to the above example, and may be any shape as long as the flange portion 52 is in contact with the inner wall surface 11a of the outer wall 11 when the cylindrical portion 51 is inserted into the communication hole 12.

  In 1st Embodiment, the opening part located outside the housing | casing 10 among the two opening parts which the cylinder part 51 has was shown in the example obstruct | occluded with the respiratory filter 40. As shown in FIG. However, it is also possible to adopt a configuration in which the opening located inside the housing 10 among the two openings of the cylinder portion 51 is closed by the breathing filter 40.

DESCRIPTION OF SYMBOLS 10 ... Housing, 11 ... Outer wall, 11a ... Inner wall surface, 11b ... Outer wall surface, 11c ... Annular outer wall surface, 12 ... Communication hole, 12a ... Wall surface, 30. ..Waterproof member, 40 ... respiratory filter, 50 ... installation member, 51 ... cylinder part, 51a ... outer surface, 52 ... collar part, 53 ... annular part, 53a ... An annular lower surface, 54 ... O-ring, 60 ... protection part, 61 ... side wall, 61a ... end, 62 ... lid part, 70 ... unevenness, 100 ... waterproof structure

Claims (12)

A housing (10) in which a communication hole (12) communicating the inside and the outside is formed in the outer wall (11);
A waterproof member (30) provided in the communication hole of the housing,
The waterproof member is
A breathing filter (40) that is waterproof and breathable;
An installation member (50) for installing the respiratory filter in the communication hole;
A protective member (60) connected to the installation member and protecting the respiratory filter;
The installation member is
A cylindrical portion provided in the communication hole so that the wall surface (12a) constituting the communication hole and its outer surface (51a) are in contact with each other, and one of the two openings is closed by the breathing filter. (51),
Of the two end portions of the cylindrical portion, a flange portion (52) provided on the outer surface of the end portion located inside the casing;
An annular portion (53) provided on the outer surface of the end located outside the casing, of the two ends of the cylindrical portion,
The annular portion is disposed between an annular lower surface (53a) facing the outer wall surface (11b) of the casing and an annular outer wall surface (11c) facing the annular lower surface of the outer wall surface of the casing, O is sandwiched between the annular portion and the casing by contacting the annular lower surface and the annular outer wall surface by the stress generated by bending the portion in contact with the inner wall surface (11a) of the outer wall. A ring (54),
The protective member includes an annular side wall (61) surrounding each of the annular part and the O-ring, and a lid part that closes an opening part of the two openings formed by the side wall from the casing. (62)
The end wall (61a) facing the housing on the side wall and the outer wall of the housing facing the edge are formed with irregularities (70) for being combined with each other. Waterproof structure.   In the height direction orthogonal to the outer wall surface of the casing, the length (L1) of the unevenness formed on the end portion of the side wall and the outer wall of the casing is the annular portion and the height in the height direction. The waterproof structure according to claim 1, wherein the waterproof structure is shorter than a length (L2) between the outer wall of the housing.   The waterproof structure according to claim 1 or 2, wherein the O-ring is isolated from an external atmosphere by an elastic member (73) provided on the unevenness. The elastic member has adhesiveness,
The waterproof structure according to claim 3, wherein the protection member and the housing are bonded by the elastic member.   The protrusion (13) is formed at a position farther from the communication hole than a portion of the outer wall surface of the housing facing the end of the side wall. The waterproof structure according to claim 1. An annular flange 65 is provided on the side wall of the protective member,
The ridge and the protrusion are opposed to each other with a gap in a height direction perpendicular to the outer wall surface of the housing in order to prevent water from entering the unevenness. 5. The waterproof structure according to 5.   The waterproof structure according to claim 1, wherein the side wall of the protection member is inclined so that an outer diameter of the side wall becomes longer toward the housing.   A convex part (71) is formed at the end of the side wall, a concave part (72) is formed on the outer wall of the housing, and the concave and convex parts are formed by combining the convex part and the concave part. The waterproof structure according to claim 1, wherein:   The waterproof structure according to claim 8, wherein a plurality of the convex portions are formed at an end portion of the side wall, and a plurality of the concave portions are formed at an outer wall of the housing.   A concave portion (74) is formed at the end of the side wall, a convex portion (75) is formed on the outer wall of the housing, and the concave and convex portions are formed by combining the concave portion and the convex portion. The waterproof structure according to claim 1, wherein:   The waterproof structure according to claim 10, wherein a plurality of the concave portions are formed at an end portion of the side wall, and a plurality of the convex portions are formed at an outer wall of the housing. A vent hole (64) is formed in the side wall, and the inside and outside of the housing communicate with each other through the vent hole, the breathing filter, and the cylindrical portion.
The breathing filter closes an opening located outside the casing in the cylindrical portion,
The vent has an opening that opens to the installation member side, and an opening that opens to an external atmosphere.
The waterproof portion according to any one of claims 1 to 11, wherein an opening portion of the ventilation hole that opens toward the installation member faces the installation member in an axial direction of the ventilation hole. Construction.

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