JP2014222694A - Ventilation member, ventilation member mounting jig, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and reliably mount a ventilation member to a housing in simple configuration.SOLUTION: A ventilation member comprises: a cylindrical support which is locked to an opening for ventilation provided in a housing and becomes a ventilation passage between the inside and the outside of the housing; a ventilation filter which is disposed in the support so as to close one opening of the support; a cover part for covering the support from the side where the ventilation filter is disposed; and a plurality of legs each including a hook fitted with the housing in the tips and extending from an end portion opposite to the side where the ventilation filter is disposed, in an axial direction of the support. The support is then formed by axially connecting a cylindrical first cylinder part in which the ventilation filter is disposed and the ventilation passage has a predetermined opening area, and a cylindrical second cylinder part in which the opening area of the ventilation passage is smaller than the first cylinder part, and has a connection surface coupling inner walls of the first cylinder part and the second cylinder part.

Description

  The present invention relates to a ventilation member provided in a housing, a ventilation member attachment jig used for the attachment, and an electronic device to which the ventilation member is attached.

  Conventionally, as in Patent Document 1, a ventilation member that is locked to an opening of a housing has been proposed. The ventilation member includes a support body having a through hole serving as a ventilation path inside and outside the housing, a ventilation filter disposed on the support body so as to block one of the through holes, and the support body on the side opposite to the ventilation filter. And a leg portion disposed on the surface. The leg portion is formed to extend from the support body in the penetration direction of the through hole. By inserting such a leg into the opening of the housing, the support is fixed to the housing.

  The leg portion provided in the ventilation member of Patent Document 1 includes a leg portion having a hook-shaped fixing portion at a tip thereof and a leg portion having no fixing portion. The leg portion having the fixing portion is fitted into the casing, and the support is fixed to the casing by snap fitting. The leg portion that does not have the fixing portion is a guide that is provided to prevent problems such as tilting while the support body is inserted into the housing.

JP 2007-141629 A

  By the way, since the leg part which has a fixing | fixed part for producing the effect of a snap fit is elastically deformed when inserted in a housing | casing, a certain amount of intensity | strength is requested | required. For this reason, the width | variety more than fixed is calculated | required about the physique of the leg part which has a fixing | fixed part.

  As in Patent Document 1, in the configuration in which the support portion of the ventilation member includes both the leg portion having the fixing portion and the leg portion as the guide, a width sufficient for the physique of the leg portion having the fixing portion is provided. If it secures, the physique of the whole ventilation member will become large. For example, the housing accommodates a sensor and a circuit board and has recently been required to be downsized. For this reason, it will be contrary to the request | requirement of size reduction that the physique of a ventilation member will become large.

  On the other hand, priority can be given to the physique of the ventilation member, and a configuration without a leg portion as a guide can be adopted. However, in this case, in order to prevent the support body from being tilted in the middle of being inserted into the housing, the strength of the plurality of leg portions having the fixing portion must be made uniform.

  In addition, the ventilation member is attached by pushing the tip of the leg into the opening of the housing while keeping the tip of the leg in contact with the ventilation member mounting jig and suppressing the inclination of the ventilation member. Must be.

  The present invention has been made in view of the above problems, and an object thereof is to easily and reliably attach a ventilation member to a housing with a simple configuration.

  In order to achieve the above object, the present invention provides a ventilation member that is locked to a ventilation opening (110) provided in a casing (100), and is provided with a ventilation path (21) inside and outside the casing. A cylindrical support body (20), a ventilation filter (30) disposed on the support body so as to close one opening of the support body, and a cover portion that covers the support body from the side where the ventilation filter is disposed ( 40), and a plurality of legs (50) having a flange portion (51) fitted to the housing at the tip and extending in the axial direction of the support from the end opposite to the side where the ventilation filter is disposed, And the support has a cylindrical first cylindrical portion (22) in which a ventilation filter is disposed and a ventilation path has a predetermined opening area, and a cylindrical shape in which the opening area of the ventilation path is larger than that of the first cylindrical section. The second cylinder part (23) is connected in the axial direction, and the inner wall (22 of the first cylinder part and the second cylinder part) It is characterized in that it has a connecting surface (24) connecting the 23a).

  According to this, when the ventilation member is inserted into the opening portion, not the tip of the leg portion but the connection surface that connects the inner walls of the first cylinder portion and the second cylinder member is brought into contact with the ventilation member attachment jig. The posture of the member can be stabilized. Therefore, it is possible to eliminate the need to make the strength of the leg portions uniform with high accuracy. In addition, it is possible to eliminate the need to make the tip shape of the leg portion uniform with high accuracy. That is, the ventilation member can be easily and reliably attached to the housing.

  Further, the ventilation member mounting jig (60) for locking the ventilation member to the housing includes a contact portion (61) that contacts the connecting surface when the ventilation member is inserted into the opening, and a contact portion. And a support portion (63) connected to the opposite side to the contact surface (61a) with the connection surface to support the contact portion, and the contact portion and the support portion form a column shape extending in the axial direction. The contact portion is arranged in this order in the axial direction, and the contact portion has a cross-sectional area perpendicular to the axial direction larger than the opening area of the first cylindrical portion and not more than the opening area of the second cylindrical portion, and the support portion. Is characterized in that when the ventilation member is inserted into the opening, the leg that is elastically deformed by being urged by the housing does not interfere with the support.

  According to this, a contact part contacts a connection surface reliably, without penetrating the opening of a 1st cylinder part. Thereby, the attitude | position of a ventilation member can be stabilized.

  Further, in the process of inserting the ventilation member into the housing, even if the leg is elastically deformed by being urged by the inner wall of the opening of the housing, the leg interferes with the ventilation member mounting jig and the housing. Can be prevented.

It is a figure which shows schematic structure of the ventilation member and housing | casing which concern on 1st Embodiment, and is sectional drawing which follows the II line | wire in FIG. It is a bottom view which shows schematic structure of a ventilation member. It is sectional drawing which shows the state before a ventilation member is fitted by a housing | casing. It is sectional drawing which shows the state in the middle of a ventilation member being fitted by a housing | casing. It is a bottom view which shows schematic structure of the ventilation member which concerns on 2nd Embodiment. It is a bottom view which shows schematic structure of the ventilation member which concerns on a 1st modification. It is a bottom view which shows schematic structure of the ventilation member which concerns on a 2nd modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same reference numerals are given to the same or equivalent parts.

(First embodiment)
Initially, with reference to FIG. 1 and FIG. 2, schematic structure of the ventilation member which concerns on this embodiment is demonstrated.

  As shown in FIG. 1, the ventilation member 10 is attached to the housing 100 and ventilates the inside of the housing 100. The ventilation member 10 is inserted into the opening (110) from the outside to the inside of the housing 100 and is locked to the housing 100. At that time, the seal ring 200 is interposed between the ventilation member 10 and the housing 100.

  The ventilation member 10 covers and protects the cylindrical support body 20 that forms the ventilation path 21 inside and outside the housing 100, the ventilation filter 30 that is joined to the support body 20 so as to close the ventilation path 21, and the ventilation filter 30. And a cover portion 40 to be used. A plurality of legs 50 are connected to the support 20.

  The housing 100 is made of, for example, aluminum, and is a container that houses an electronic component (not shown) inside. The housing 100 has an opening (110). The edge 100a of the casing 100, which is the outline of the opening (110), is bent toward the inside of the casing 100 together with the vicinity thereof. The ventilation member 10 is locked to the casing 100 by fitting a leg portion 50 of the support 20 described later to the edge portion 100a. The electronic component in the present embodiment controls, for example, the movement of the vehicle, and an ECU (electronic control unit) is configured by the housing 100, the ventilation member 10 attached to the housing 100, and the electronic component.

  The support 20 has a first tube portion 22 and a second tube portion 23. These are cylindrical with the same shaft, and are connected to each other in the axial direction to form the support 20. Especially the 1st cylinder part 22 and the 2nd cylinder part 23 in this embodiment are cylindrical. The 1st cylinder part 22 is a cylinder by which the internal diameter was made constant in the axial direction, and the ventilation filter 30 is joined so that one opening to which the 2nd cylinder part 23 is not connected may be plugged up. The 2nd cylinder part 23 is a frustum-shaped cylinder with which both an internal diameter and an outer diameter expand as it goes inside the housing | casing 100 about an axial direction. With respect to the cross-sectional area (opening area) of the ventilation path 21 orthogonal to the axial direction, the opening area of the first cylindrical portion 22 is made smaller than the opening area of the second cylindrical portion 23. That is, in both the first cylinder part 22 and the second cylinder part 23, the cross section of the ventilation path 21 orthogonal to the axial direction is a circle and is in a similar relationship.

  The support 20 is a connecting surface that connects, as a part of the ventilation path 21, the inner wall 22 a constituting the ventilation path 21 of the first cylinder part 22 and the inner wall 23 a constituting the ventilation path 21 of the second cylinder part 23. 24. The connecting surface 24 in the present embodiment is orthogonal to the axial direction of the cylindrical support 20.

  The leg portion 50 is integrally connected to the second cylindrical portion 23 and is formed to extend substantially in the axial direction. As shown in FIG. 2, the leg portion 50 in the present embodiment is formed to be three times symmetrical with respect to the axis of the second cylinder portion 23. Each of the three legs 50 has a flange 51. The ventilation member 10 is locked to the housing 100 when the flange portion 51 comes into contact with the edge portion 100a of the housing 100 and produces a snap fit effect.

  In addition, the 1st cylinder part 22, the 2nd cylinder part 23, and the leg part 50 which comprise the support body 20 can be produced by common shaping | molding methods, such as injection molding and cutting, making these the one thing. it can. From the viewpoint of moldability, it is preferable to use a thermoplastic resin such as polybutylene terephthalate (PBT), nylon (PA), or polyethylene terephthalate (PET) as the material for the support 20 and the legs 50. In the present embodiment, PBT is adopted.

  The structure and material of the ventilation filter 30 are not limited as long as the ventilation filter 30 allows the passage of gas and prevents the passage of liquid. In this embodiment, for example, a fluororesin porous body is employed. The ventilation filter 30 is joined so as to block one opening of the first cylinder portion 22 to which the second cylinder portion 23 is not connected. Although the ventilation filter 30 in this embodiment is heat-welded to the 1st cylinder part 22, there are methods, such as ultrasonic welding and adhesion | attachment by an adhesive agent.

  The cover portion 40 has a bottomed cylindrical shape having the same axis as that of the support body 20, and includes a side wall portion 41 corresponding to the side surface of the cylinder and a ceiling portion 42 corresponding to the bottom surface of the cylinder. A part of the side wall 41 is notched, and a portion sandwiched between adjacent notches acquires flexibility. A claw 43 is formed in a portion sandwiched between the adjacent notches, and is fitted and fixed to the first tube portion 22 of the support portion 20 by snap fit. A claw fitting portion 22 b that fits the claw 43 is also formed in the first tube portion 22 in accordance with the position where the claw 43 is formed. The cover part 40 in this embodiment has the three side wall parts 41 in which the nail | claw 43 was formed. Then, as shown in FIG. 2, these are formed so as to be three times symmetrical with respect to the axes of the first cylinder portion 22 and the second cylinder portion 23. Thus, the cover part 40 is fixed to the support part 20 so that the ventilation filter 30 and one opening of the support part 20 may be covered. In addition, the cover part 40 can be produced by the injection molding method using the same material as the support part 20 and the leg part 50. FIG. 2 is a bottom view of the housing 100 as viewed from the inside to the outside. In FIG. 2, the ventilation filter 30 and the seal ring 200 are omitted from the ventilation member 10 for simplicity.

  The ventilation member 10 is fixed to the housing 100 via a seal ring 200 (for example, an O-ring). The seal ring 200 in the present embodiment is disposed so as to surround the second cylindrical portion 23 of the support portion 20. When the ventilation member 10 is fixed, the seal ring 200 comes into contact with the housing 100, the first tube portion 22, and the second tube portion 23 as shown in FIG. 1.

  Next, with reference to FIG. 3 and FIG. 4, a schematic configuration of a ventilation member attachment jig for attaching the ventilation member 10 according to the present embodiment to the housing 100 will be described. 3 shows a state before the ventilation member 10 is inserted into the housing 100, and FIG. 4 shows a state during the insertion.

  As shown in FIG. 3, the ventilation member mounting jig 60 includes a contact portion 61, an insertion portion 62, and a support portion 63 that supports the contact portion 61 and the insertion portion 62 by connecting them. The ventilation member mounting jig 60 in the present embodiment has a rotating body shape having the same axis as the support 20 of the ventilation member 10 as a whole.

  In the contact portion 61, the cross-sectional area of the cross section orthogonal to the axial direction is larger than the opening area of the first cylindrical portion 22 and is equal to or smaller than the opening area of the second cylindrical portion 23. That is, the contact portion 61 can be accommodated inside the second cylinder portion 23 but cannot be accommodated inside the first cylinder portion 22. Thereby, when the ventilation member 10 is inserted into the housing 100 and locked, the contact portion 61 accommodated in the second cylindrical portion 23 comes into contact with the connecting surface 24 of the support 20 to generate drag, The posture of the ventilation member 10 can be stabilized. The contact portion 61 in the present embodiment has a cylindrical shape whose diameter is substantially the same as the inner diameter of the second cylindrical portion 23 (the diameter of the ventilation path 21). Thereby, the connection surface 24 of the support body 20 contacts the contact part 61 over the whole surface, and the attitude | position of the ventilation member 10 can be stabilized more.

  Further, the contact portion 61 has a protruding portion 64 that protrudes from a surface 61 a that faces the connecting surface 24 of the support 20. The projecting portion 64 has a cylindrical shape along the inner diameter of the first cylindrical portion 22 and is formed so as to fit into the opening of the first cylindrical portion 22.

  The insertion portion 62 includes a columnar structure having a diameter substantially the same as that of the opening 110 of the housing 100. That is, as illustrated in FIG. 3, immediately before the ventilation member 10 is inserted into the housing 100, the insertion portion 62 is inserted into the opening 110 of the housing 100 with almost no gap.

  The support part 63 connects and supports the contact part 61 and the insertion part 62. The diameter of the support part 63 in this embodiment is smaller than that of the contact part 61 and the insertion part 62. Therefore, as shown in FIG. 4, even when the leg portion 50 is elastically deformed while the ventilation member 10 is inserted into the casing 100, the leg portion 50 may interfere with the ventilation member attachment jig 60. Absent.

  Moreover, the support part 63 is formed so that the opposing distance of the connection surface 24 and the insertion part 62 may become longer than the length from the connection surface 24 to the front-end | tip 51a of the leg part 50 (hook part 51). For this reason, when the connecting surface 24 of the ventilation member 10 is placed in contact with the surface 61 a of the contact portion 61, the tip 51 a of the leg portion 50 comes into contact with any portion of the ventilation member attachment jig 60. There is no.

  The contact part 61, the contact part 62, the support part 63, and the protrusion part 64 are rotating bodies having the same axis, and the protrusion part 64, the contact part 61, the support part 63, and the insertion part 62 are connected in this order in the axial direction. Thus, the ventilation member mounting jig 60 is configured. The ventilation member attachment jig 60 is made of, for example, stainless steel, and can be manufactured by a general molding technique such as forging or cutting, with the contact portion 61, the contact portion 62, the support portion 63, and the protruding portion 64 being integrated. .

  Next, with reference to FIG. 3 and FIG. 4, the manner and effect of attaching the ventilation member 10 to the housing 100 using the ventilation member attachment jig 60 will be described in the order of attachment.

  First, the ventilation member attaching jig 60 is inserted into the opening (110) of the casing 100 from the side corresponding to the inside of the casing 100. In this state, the contact part 61, the protruding part 64, the support part 63, and a part of the insertion part 62 protrude to the outside of the housing 100. As described above, the insertion portion 62 of the ventilation member attachment jig 60 includes a structure having a diameter substantially the same as that of the opening 110 of the housing 100. For this reason, if the insertion part 62 is inserted through the opening 110 with almost no gap, the position of the ventilation member attachment jig 60 relative to the housing 100 can be uniquely determined.

  Next, as shown in FIG. 3, the ventilation member 10 is placed on the ventilation member attachment jig 60 so that the connecting surface 24 of the ventilation member 10 contacts the contact portion 61 of the ventilation member attachment jig 60. In the ventilation member 10 in this state, the connecting surface 24 receives a drag force from the contact portion 61 and balances with the gravity to maintain the posture. In addition, the protrusion 64 of the ventilation member attachment jig 60 is fitted into the ventilation path 21 of the first tube portion 22 of the ventilation member 10, thereby stabilizing the posture of the ventilation member 10.

  In the configuration in which the ventilation member 10 does not have the connecting surface 24 as in the prior art, the tip 51a of the leg portion 50 receives a drag force against the gravity by contacting the insertion portion 62, so that the posture of the ventilation member 10 is stable. The manufacturing accuracy of the tip 51a had to be high. On the other hand, in this embodiment, since the attitude | position of the ventilation member 10 is stabilized by contact with the connection surface 24 and the contact part 61, the ventilation member 10 does not raise the precision of the front-end | tip 51a of the leg part 50 more than necessary. Can be manufactured.

  Next, as shown in FIG. 4, the ventilation member 10 is inserted toward the inside of the housing 100. The leg part 50 of the ventilation member 10 is urged from the edge part 100a forming the opening part 110 of the housing 100 and elastically deforms. That is, the leg part 50 is bent to the axial side. Since the support part 63 of the ventilation member attachment jig 60 is thinner than the contact part 61 and the insertion part 62, interference of the elastically deformed leg part 50 with the ventilation member attachment jig 60 can be prevented. When the ventilation member 10 is inserted toward the inside of the housing 100, the housing 100 is fixed by a fixing tool (not shown) and is not displaced by the elastic force of the leg portion 50. Thereby, the ventilation member 10 can be attached to the housing 100 with high accuracy.

  From the state of FIG. 4, the pushing device 300 is pressed against the cover portion 40, and the ventilation member 10 is further pushed, whereby the leg portion 50 is fitted into the opening 110 of the housing 100 as shown in FIG. 1. That is, the ventilation member 10 can be fixed to the housing 100 by the snap fit effect.

(Second Embodiment)
In 1st Embodiment, as shown in FIG. 2, the 1st cylinder part 22 of the support body 20 showed as an example the aspect which comprised a cylinder. That is, the ventilation path 21 of the first cylindrical portion 22 has a circular cross section perpendicular to the axial direction. On the other hand, in the present embodiment, the inner wall 22a of the first cylindrical portion 22 has a guide protrusion 22c. That is, as shown in FIG. 5, the cross section of the ventilation path 21 has a shape having a notch in the circumference. Since elements other than the cross-sectional shape of the ventilation path 21 are the same as those in the first embodiment, detailed description thereof is omitted.

  According to this, when the ventilation member 10 is assembled, the rotational position around the axis of the support 20 can be uniquely determined. Since the cover part 40 is fixed by fitting the claw 43 of the cover part 40 with the claw fitting part 22b of the first cylinder part 22, the rotational position around the axis is uniquely determined, The process of fitting the portion 40 to the first tube portion 22 can be facilitated.

(First modification)
About the cross-sectional shape of the ventilation path 21 of the 1st cylinder part 22, it is not limited to the structure which has a notch in a periphery. In the present modification, for example, a groove 22d along the axial direction is formed in the inner wall 22a of the first cylindrical portion 22, so that the cross-sectional shape of the ventilation path 21 is a single circle as shown in FIG. It has a shape that has a convex part.

  Even in such a configuration, as in the second embodiment, when the ventilation member 10 is assembled, the rotational position around the axis of the support 20 can be uniquely determined. Therefore, the process of fitting the cover part 40 to the first cylinder part 22 can be facilitated.

(Second modification)
In each of the above-described embodiments, the cross-sectional shape of the ventilation path 21 of the first cylindrical portion 22 has been illustrated by taking a circular shape as an example. On the other hand, in this modification, as shown in FIG. 7, the cross-sectional shape of the ventilation path 21 is substantially triangular.

  Even in such a configuration, similarly to the second embodiment and the first modification, when the ventilation member 10 is assembled, the rotational position around the axis of the support 20 can be uniquely determined. As described in the first embodiment, the claw 43 of the cover portion 40 is formed to be three times symmetrical with respect to the axes of the first tube portion 22 and the second tube portion 23. For this reason, when the cross-sectional shape of the ventilation path 21 of the first cylindrical portion 22 is substantially triangular, when the cover portion 40 is fitted to the support body 20, the rotational position of the claw fitting portion 22b is uniquely determined. Can do. Therefore, the process of fitting the cover part 40 to the first cylinder part 22 can be facilitated.

(Other embodiments)
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 each of the above-described embodiments and modifications, an example in which the number of leg portions 50 connected to the support 20 is three is shown, but the number of leg portions 50 is not limited to the above example. Further, the number of claws 43 provided in the cover portion 40 is not limited to three as in the above example.

  In addition, when the cross-sectional shape of the ventilation path 21 of the 1st cylinder part 22 is made into substantially polygonal shape like the 2nd modification, the nail | claw 43 of the cover part 40 is formed n times symmetrically with respect to the axis | shaft. If so, the number of corners of the polygonal shape is preferably n. Specifically, if the cover portion 40 is formed with five claws 43 and each claw 43 is arranged five times symmetrically with respect to the axis, the cross-sectional shape of the ventilation path 21 of the first cylindrical portion 22 Should be approximately pentagonal. Thereby, the rotation position of the support body 20 with respect to the cover part 40 can always be made equivalent. Therefore, the process of fitting the cover part 40 to the first cylinder part 22 can be facilitated.

  Further, in each of the above-described embodiments and modifications, the example in which the contact portion 61, the contact portion 62, the support portion 63, and the protruding portion 64 are formed as a single unit with respect to the ventilation member mounting jig 60 has been shown. is not. That is, each may be formed as a separate body.

DESCRIPTION OF SYMBOLS 10 ... Ventilation member 20 ... Support body, 21 ... Ventilation path, 22 ... 1st cylinder part, 23 ... 2nd cylinder part, 24 ... Connection surface 30 ... Ventilation filter 40 .. cover part 40
50 ... Leg 100 ... Housing 200 ... Seal ring

Claims (6)

A ventilation member locked to a ventilation opening (110) provided in the housing (100),
A cylindrical support body (20) serving as a ventilation path (21) inside and outside of the housing, a ventilation filter (30) disposed on the support body so as to close one opening of the support body, and the ventilation A cover portion (40) that covers the support from the side where the filter is disposed, and a flange portion (51) that fits the housing at the tip, and the end opposite to the side where the ventilation filter is disposed A plurality of legs (50) extending in the axial direction of the support from
The support body includes a cylindrical first cylinder portion (22) in which the ventilation filter is disposed, the ventilation path has a predetermined opening area, and a cylinder having an opening area of the ventilation path larger than that of the first cylinder section. And a second cylindrical portion (23) having a shape connected in the axial direction,
A ventilation member having a connection surface (24) connecting the inner walls (22a, 23a) of the first cylinder part and the second cylinder part.   The ventilation member according to claim 1, wherein the connection surface is orthogonal to the axial direction.   The said 1st cylinder part has the guide protrusion (22c) or the groove | channel for guides (22d) which uniquely determines the rotation position around an axis | shaft in the inner wall, The Claim 1 or Claim 2 characterized by the above-mentioned. Ventilation member. A ventilation member mounting jig for inserting and locking the ventilation member according to any one of claims 1 to 3 into an opening of a housing,
When the ventilation member is inserted into the opening, a contact portion (61) that contacts the connection surface;
A support portion (63) connected to the opposite side to the contact surface (61a) with the connection surface in the contact portion and supporting the contact portion,
The contact part and the support part are arranged in the axial direction in this order while forming a columnar shape extending in the axial direction,
The contact portion has a cross-sectional area perpendicular to the axial direction that is larger than an opening area of the first tube portion and not more than an opening area of the second tube portion,
The support portion is formed such that the leg portion that is elastically deformed by being urged by the housing when the ventilation member is inserted into the opening portion does not interfere with the support portion. Ventilation member mounting jig.   The contact portion protrudes in the axial direction from a surface facing the connection surface, and is inserted into the ventilation path of the first tube portion when the ventilation member is inserted into the opening of the housing. The ventilation member mounting jig according to claim 4, further comprising a projecting portion (64) to be joined. An electronic device comprising a housing and an electronic component housed in the housing,
The electronic device according to claim 1, wherein the ventilation member according to claim 1 is attached to an opening of the housing.

Images