JP4380939B2 - Wire connection structure and method for venting air inside device case - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric wire connection structure for connecting covered electric wires to each other and an air venting method in an apparatus case body using the same.
[0002]
[Prior art]
FIG. 9 is a cross-sectional view of a conventional wire connection structure. In this conventional electric wire connection structure, as shown in FIG. 9, the connecting portions 5 of the two covered electric wires 1 and 3 are inserted into a cap 9 filled with an epoxy resin 7 and sealed. Yes. In the connection part 5, the conductor parts 11 and 13 exposed by peeling off both the covered electric wires 1 and 3 are connected by resistance welding.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional wire connection structure, when both the covered wires 1 and 3 are used not only as a conductive path but also as an air flow path using the internal space of the resin coating, Therefore, there is a problem that the two covered wires 1 and 3 cannot be used as air flow paths.
[0004]
Accordingly, in view of the above problems, the present invention provides a wire connection structure that can utilize both coated wires as a conductive path and an air flow path while waterproofing and protecting the connection portions of the both coated wires connected to each other. It is an object of the present invention to provide a method for venting air inside an equipment case using the same.
[0005]
[Means for Solving the Problems]
The technical means for achieving the above object is that the resin coatings at the end portions of both coated wires to be connected are peeled off to expose the conductor portions, and the connection portions connected to each other and the tubular shape are formed. And surrounding the region from the end of the resin coating of the both coated wires to the connecting portion and having both the insulated wires drawn out from the openings on one side or both sides. An enclosure member, a resin sealing body that encloses and seals the enclosure member, and a gap sealing material that seals a gap generated in the opening of the enclosure member. The periphery of the member is sealed by the sealing body in a state in which gas can flow between the internal spaces of the resin coating of the both covered wires via the internal space of the surrounding member. Features.
[0007]
Preferably, silicon resin is used as the gap sealing material.
[0008]
Furthermore, it is preferable that grease be used as the gap sealing material.
[0009]
Preferably, an adhesive hot-melt resin that melts by heating is used as the gap sealing material.
[0010]
More preferably, an epoxy resin is used as the sealing body.
[0011]
Preferably, the two covered electric wires are connected to each other in a state of being arranged close to each other at the connection portion, and are inserted into the surrounding member from the opening on one side.
[0012]
Further preferably, the both covered wires are connected to each other in a state where they are arranged so as to face each other in the linear direction at the connection portion, and are inserted into the surrounding member from the openings on both sides, respectively. It is good to be.
[0013]
Preferably, both the covered wires have different outer diameters.
[0014]
Furthermore, the technical means for achieving the object is a method for venting air in the device case body using the wire connection structure according to any one of claims 1 to 8 , wherein one of the two covered wires is provided. The end portion of the covered electric wire is airtightly inserted into the device case body and connected to the electronic device housed in the device case body, thereby using the two covered electric wires connected to each other as a conductive path, and It is characterized by being used as an air flow path for venting air inside the device case.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view of an electric wire connection structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a configuration inside a cap, and FIG. 3 is a cross-sectional view showing a configuration of a lead-out cable drawn out from an equipment case body. FIG. 4 is a cross-sectional view showing a sealing structure of the drawer cable on the device case body side, and FIG.
[0016]
As shown in FIGS. 1 and 2, this wire connection structure includes at least one covered wire 25 in the lead-out cable 23 drawn from the device case body 21, and the covered wire 25 and another connection target (not shown). This is for connecting at least one covered electric wire 27 for relaying between them.
[0017]
Here, the device case body 21 is for housing an electronic device therein and protecting and waterproofing it from the outside. The portion of the case body 21 other than the lead-out hole 21a for pulling out the cable 23 is configured to maintain an airtight state. In this embodiment, the case body 21 is assumed to be a case body of an in-vehicle camera that is installed facing the outer surface of the vehicle and images the periphery of the vehicle.
[0018]
As shown in FIG. 3, the cable 23 is made of metal so as to surround the three covered electric wires 25, the conductor wire (metal stranded wire) 29 with the conductor portion exposed, and the covered electric wire 25 and the conductor wire 29. And a shield knitting wire 31 formed by knitting a plurality of strands into a tube shape, and an outermost coating layer 33 surrounding the covered electric wire 25 and the conductor wire 29 from above the knitting wire 31. ing. The conductor wire 29 is in electrical contact with the braided wire 31 in the outermost coating layer 33.
[0019]
Here, the three covered electric wires 25 are used as, for example, a signal line for an image signal, a signal ground line, and a power supply line, respectively, and the conductor line 29 is a power supply ground line that also functions as a shield line. Used as
[0020]
At the end of the cable 23 on the case body 21 side, as shown in FIGS. 3 and 4, the outermost coating layer 33 is peeled off, and the exposed portion of the knitted wire 31 exposed thereby is cut off. Yes. An insulating heat shrink tube 35 is externally attached to the exposed portion of the conductor wire 29.
[0021]
As shown in FIG. 4, a sealing member 37 is attached to the end of the cable 23 subjected to such terminal processing. The sealing member 37 has a substantially cylindrical shape, and a rubber ring member 39 is externally attached to the outer peripheral portion thereof, and a flange portion 37a for preventing the ring member 39 from coming off projects. It is installed. In the internal cavity 37b of the sealing member 37, the cable 23 is inserted so that the end of the outermost coating layer 33 of the cable 23 on the case body 21 side is positioned in the inner cavity 37b. Resin 41 is filled, whereby the gap between the outer peripheral surface of outermost coating layer 33 and sealing member 37 and the gap in the opening of outermost coating layer 33 are sealed.
[0022]
And as shown in FIG. 1, by screwing such a sealing member 37 into the extraction hole 21a provided in the case body 21, between the outer peripheral surface of the sealing member 37 and the inner peripheral surface of the extraction hole 21a. The gap is sealed by the ring member 39.
[0023]
As a result, in the lead-out portion of the cable 23 from the case body 21, the inside and outside of the case body 21 communicate with each other only through the internal space of the resin coating 43 of each covered electric wire 25 provided in the cable 23.
[0024]
Moreover, the connector 45 connected with the connection part of the electronic device in the case body 21 is connected to the edge part by the side of the case body 21 of the covered electric wire 25 and the conductor wire 29. FIG.
[0025]
By the way, the covered electric wires 25 and 27 formed by covering the conductor portions 47 and 49 (see FIG. 5) with the resin coatings 43 and 51 are generally in the internal space in which the conductor portions 47 and 49 in the resin coatings 43 and 51 are accommodated. A gas can be circulated through a minute amount (for example, a gap between a plurality of strands constituting the conductor portions 47 and 49). Therefore, in the present embodiment, the inside of the resin coatings 43 and 51 of the covered electric wires 25 and 27 is designed to remove air when the air pressure increases due to temperature fluctuations in the sealed case body 21 while waterproofing the case body 21. Go through space.
[0026]
Further, the connecting portion of the electronic device accommodated in the case body 21 according to the present embodiment is small, and the connector 45 needs to be small correspondingly, and the covered electric wire 25 connected to the connector 45 is also thin. It is necessary to make the diameter. On the other hand, the connection destination of the cable 23 drawn from the case body 21 is a connector of a wire harness (not shown) disposed in the vehicle body, for example, and the size of the connector is larger than the connector 45. This is because the wire diameter of the wire constituting the wire harness is thicker than the covered wire 25. However, it is difficult to directly connect the connector 53 for connection with the harness-side connector to the small-diameter covered electric wire 25.
[0027]
Therefore, in this embodiment, three covered electric wires 27 and one covered electric wire 55 having a larger diameter are connected to the three covered electric wires 25 and one conductor wire 29, and the covered electric wires 27, A connector 53 is connected to 55.
[0028]
Next, the wire connection structure of the covered wire 25 and the conductor wire 29 and the covered wires 27 and 55 will be described.
[0029]
As shown in FIGS. 2 and 5, the wire connection structure according to the present embodiment is roughly a connection portion 57 between the covered wire 25 and the covered wire 27 and a connection portion (not shown) between the conductor wire 29 and the covered wire 55. And heat-shrinkable tubes (enclosure members) 59 and 61 that surround the connection portions 57, respectively, and an epoxy resin 63 that is a sealing body.
[0030]
Here, the structure of such an electric wire connection structure is demonstrated according to the connection process. First, the outermost covering layer 33 at the end of the cable 23 is peeled off, and the knitted wire 31, the covered electric wire 25, and the conductor wire 29 are exposed. Subsequently, at the end portions of the respective covered electric wires 25 and the respective covered electric wires 27 to be connected to each other, as shown in FIG. The conductor portions 47 and 49 are exposed and are connected to each other by the crimp terminal 65 in a state where they are arranged so as to approach each other in parallel, thereby forming the connection portion 57. At the same time, although not shown in detail, the exposed conductor wire 29 and the braided wire 31 are arranged in a line and arranged parallel to the conductor portion of the covered electric wire 55 exposed by peeling. In this state, they are connected by crimp terminals, thereby forming a connection portion.
[0031]
Subsequently, as shown in FIG. 7, the heat-shrinkable tubes 59 and 61 are attached to the connecting portions 57. The heat shrinkable tubes 59 and 61 are attached by inserting the connecting portion 57 through the opening 59a on one side and heating the heat shrinkable tubes 59 and 61 to cause heat shrinkage. In this mounted state, in particular, the heat-shrinkable tube 59 mounted on the connecting portion 57 has end portions 43a and 51a on the connecting portion 57 side of the resin coatings 43 and 51 of the both coated wires 25 and 27, as shown in FIG. It is mounted so as to surround the region from the connecting portion 57 to the connecting portion 57. In this embodiment, the heat-shrinkable tubes 59 and 61 are used as the surrounding member, but a normal insulating tube body may be used.
[0032]
Subsequently, as shown in FIG. 5, silicon resin 71 serving as a gap sealing material is applied to the gaps formed in the openings 59 a and 59 b on both sides of the heat shrinkable tube 59. This silicon resin 71 is for preventing the epoxy resin 63 from entering the internal space 73 in the heat shrinkable tube 59. Note that it is not necessary to apply the silicon resin 71 to the heat shrinkable tube 61.
[0033]
Subsequently, as shown in FIG. 2, the connection portion 57 to which the heat shrinkable tubes 59 and 61 are attached is inserted into a cap 75 filled with the liquid epoxy resin 63 in a gathered state, and then cured epoxy. The connecting portion 57 is sealed from above the heat shrinkable tubes 59 and 61 by the resin 63. At this time, in order to improve waterproofness and tensile strength, not only the heat shrinkable tubes 59 and 61 but also the end portion 33a on the connection portion 57 side of the outermost coating 33 of the cable 23 is sealed and sealed in the epoxy resin 63. It is preferable that they are fixed.
[0034]
In this sealed state, gas can flow around the heat-shrinkable tube 59 between the inner spaces of the resin coatings 43 and 51 of the both coated wires 25 and 27 through the inner space 73 of the heat-shrinkable tube 59. In this state, it is completely sealed by the epoxy resin 63.
[0035]
With such a configuration, the internal spaces 73 of the heat-shrinkable tube 59 are protected while the internal spaces of the resin coatings 43 and 51 of the covered electric wires 25 and 27 connected to each other are waterproofed and protected at the connection portions 57. Are in communication with each other.
[0036]
As described above, according to the present embodiment, the two covered electric wires 25 and 27 connected to each other are used as the conductive path and the air flow path while waterproofing and protecting the connection portion 57 (particularly, protecting against the tensile force). be able to. As a result, it is possible to vent the air in the case body 21 through both the covered electric wires 25 and 27 that are originally used as conductive paths, and therefore it is necessary to provide a special air flow path for venting the air in the case body 21. There is no advantage.
[0037]
In particular, even when it is necessary to connect the covered electric wire 25 drawn from the case body 21 to the covered electric wire 27 having a larger wire diameter as in the present embodiment, the resin between the covered electric wires 25 and 27 connected to each other is used. This is particularly effective in such a case because the gas flow through the inner space of the coatings 43 and 51 can be secured.
[0038]
Further, since the gaps generated in the openings 59a and 59b of the heat shrinkable tube 59 are sealed by the silicon resin 71, when the heat shrinkable tube 59 is inserted into the liquid epoxy resin 63, the liquid epoxy resin It is possible to prevent the resin 63 from entering the internal space 73 of the heat shrinkable tube 59 and hindering the gas flow in the internal space 73.
[0039]
In addition, as a modification of the connection form in the connection part 57 of the coating resins 25 and 27 according to the present embodiment, the exposed conductor parts 47 and 49 of the covered electric wires 25 and 27 are exposed as shown in FIG. Alternatively, the crimp terminals 65 may be connected to each other in a state where they are arranged so as to face each other in the linear direction. In this case, when the heat-shrinkable tube 59 is attached, both the covered wires 25 and 27 are drawn out from the openings 59a and 59b on both sides of the heat-shrinkable tube 59, respectively.
[0040]
In this embodiment, the silicon resin 71 is used as the gap sealing material. Instead of the silicon resin 71, grease or an adhesive hot-melt resin that melts by heating, for example, an olefin-based adhesive hot-melt resin is used. May be. In the case of using an adhesive hot-melt resin, the adhesive hot-melt resin is injected into the internal spaces 73 at both ends of the heat-shrinkable tube 59 before the heat-shrinkable tube 59 is heat-shrinked. It is preferable to perform gap sealing by melting.
[0041]
Further, for example, in the connection form of the covered electric wires 25 and 27 as shown in FIG. 8, an epoxy system is provided between the inner peripheral surface of the heat shrinkable tube 59 and the covered electric wires 25 and 27 at the openings 59 a and 59 b of the heat shrinkable tube 59. Since a gap through which the resin 73 can enter does not substantially occur, the silicon resin 71 may be omitted in such a case.
[0042]
【The invention's effect】
According to the first aspect of the present invention, the region from the end of the resin-coated connecting portion side of both the covered wires to the connecting portion is surrounded by the tubular outer member, and the outer member is wrapped and sealed. A sealing member made of resin is provided, and the periphery of the outer member is sealed in a state where gas can flow between the inner spaces of the resin covers of the two covered wires via the inner space of the outer member. Since it is sealed by the stationary body, both the covered electric wires can be used as the conductive path and the air flow path while waterproofing and protecting the connection portion (particularly, protecting against the tensile force).
[0043]
In particular, even when it is necessary to connect and connect covered electric wires having different wire diameters, it is possible to ensure gas flow through a resin-coated internal space between a plurality of covered electric wires connected to each other. Therefore, it is particularly effective in such a case.
[0044]
Further, since a gap sealing material that seals the gap generated in the opening of the surrounding member is provided, for example, when the sealing body is formed by curing a liquid resin, the liquid resin It is possible to prevent intrusion into the internal space of the outer member and obstruct the gas flow in the internal space.
[0045]
According to the ninth aspect of the present invention, since the air in the device case body can be vented through both the covered wires that are originally used as the conductive paths, a special air flow path for venting the air in the device case body is provided. There is an advantage that it is not necessary to provide it.
[0046]
In particular, even when it is necessary to connect the covered electric wire drawn out from the device case body to a covered electric wire having a different wire diameter (for example, a thicker wire diameter), the resin-coated wire is connected between a plurality of covered electric wires connected to each other. This is particularly effective in such a case because the gas flow through the internal space can be secured.
[Brief description of the drawings]
FIG. 1 is a plan view of a wire connection structure according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration inside a cap.
FIG. 3 is a cross-sectional view showing a configuration of a lead-out cable drawn from the device case body.
FIG. 4 is a cross-sectional view showing a sealing structure on the equipment case body side of the lead-out cable.
FIG. 5 is a cross-sectional view showing a configuration inside a heat shrinkable tube in which a connecting portion is inserted.
FIG. 6 is a diagram showing a heat shrink tube mounting process.
FIG. 7 is a diagram showing a heat shrink tube mounting process.
FIG. 8 is a cross-sectional view showing a modified example related to the connection form of the electric wires.
FIG. 9 is a cross-sectional view of a conventional wire connection structure.
[Explanation of symbols]
21 Case body 25, 27 Covered electric wire 29 Conductor wire 31 Braided wire 33 Outermost covering layer 43 Resin coating 47, 49 Conductor part 51 Resin coating 55 Covered electric wire 57 Connection part 59, 61 Heat shrinkable tube 63 Epoxy resin 65 Crimp terminal 71 Silicone resin

Claims (9)

The resin coatings at the end portions of both the coated wires to be connected are peeled off to expose the conductor portions, and the connection portions connected to each other;
It has a tubular shape, encloses a region from the end of the resin coating of the both coated wires to the connecting portion, and the both coated wires are opened from one or both openings. An insulative surrounding member that is drawn out;
A resin-made sealing body that encloses and seals the surrounding member;
A gap sealing material that seals a gap generated in the opening of the surrounding member;
With
The periphery of the surrounding member is sealed by the sealing body in a state in which gas can flow through the internal space of the surrounding member between the resin-coated internal spaces of the both covered wires. An electric wire connection structure characterized by that.   The wire connection structure according to claim 1, wherein a silicon resin is used as the gap sealing material.   The wire connection structure according to claim 1, wherein grease is used as the gap sealing material.   The wire connection structure according to claim 1, wherein an adhesive hot-melt resin that melts by heating is used as the gap sealing material.   The wire connection structure according to claim 1, wherein an epoxy-based resin is used as the sealing body.   The both covered wires are
  6. The connecting portion according to claim 1, wherein the connecting portions are connected to each other in a state of being arranged close to each other, and are inserted into the surrounding member from the opening on one side. Wire connection structure.   The both covered wires are
  6. The connecting portion is connected to each other in a state of being disposed so as to face each other in the linear direction, and is inserted into the surrounding member from the opening portions on both sides, respectively. The electric wire connection structure in any one of.   The electric wire connection structure according to any one of claims 1 to 7, wherein the two covered electric wires have different outer diameters.   A method for venting air in a device case body using the wire connection structure according to any one of claims 1 to 8,
  By inserting an end portion of one of the covered electric wires into the device case in an airtight manner and connecting to an electronic device housed in the device case, the two covered electric wires connected to each other are connected. An air venting method for a device case body, wherein the device case body is used as a conductive path and is used as an air flow passage for air venting in the device case body.

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