JP3715880B2 - Waterproof structure in cable insertion portion and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof structure in a cable insertion portion that is waterproofed in a portion where each electric wire such as a waterproof connector is inserted, and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, in a waterproof connector, by attaching a rubber plug to each electric wire to be assembled separately, the infiltration of liquid from between the outer peripheral surface of each electric wire and the inner peripheral surface of the electric wire insertion hole through which each electric wire is inserted is prevented. (First conventional example), or a waterproof structure using a flat-plate integrated rubber plug (first assembly) that fits a plurality of electric wires to be assembled into a plurality of previously provided electric wire fitting portions and performs waterproofing collectively 2 conventional example) and a structure (third conventional example) for waterproofing by filling and injecting resin into a wire insertion portion through which each electric wire is inserted and solidifying.
[0003]
For example, FIG. 10 shows the structure of a waterproof connector 2 using the integrated rubber plug 1, and the housing body 3 formed of resin or the like of the waterproof connector 2 is connected to the conductor end of each electric wire 4. The connection terminals 5 are provided with a large number of terminal mounting portions 3a that are fitted in a retaining shape, and are positioned at one end surface side of each terminal mounting portion 3a so that each electric wire 4 is inserted into an approximately corner. A wire insertion portion 3b is provided that protrudes in a cylindrical shape.
[0004]
The integrated rubber plug 1 has a substantially rectangular flat plate shape slightly larger than the inner shape of the wire insertion portion 3b so as to be in close contact with the inner peripheral surface of the wire insertion portion 3b when pressed into the wire insertion portion 3b. The integral rubber plug 1 is formed with a wire insertion hole 1a that is held in close contact with the terminal mounting portion 3a and is in close contact with the terminal mounting portion 3a.
[0005]
Moreover, the holder body 6 which presses down the integral rubber plug 1 attached to the electric wire insertion portion 3b from the outer surface side is provided, and the electric wire insertion through which the connection terminals 5 and the electric wires 4 are similarly inserted into the holder body 6. The holes 6a are formed correspondingly. Further, locking piece portions 6b are respectively extended at both side edges of the holder body 6, and the locking holes 6c formed in the locking piece portions 6b are provided on both sides of the outer peripheral surface of the wire insertion portion 3b. Each of the protruding protrusions 3c is detachably locked so as to press and hold the outer surface of the integrated rubber plug 1 in a retaining shape.
[0006]
[Problems to be solved by the invention]
However, according to the waterproof structure of the first conventional example of the waterproof connector, since the rubber plug is individually attached to each electric wire, it takes time to attach the rubber plug when assembling, and the connection terminal When the waterproof connector is miniaturized in accordance with miniaturization, each rubber stopper has hindered miniaturization.
[0007]
Further, according to the waterproof structure of the second conventional example, there is an advantage that the waterproof connector can contribute to miniaturization and multipolarization. However, when the electric wires 4 are passed through the electric wire fitting holes 1a of the integrated rubber plug 1, It is necessary to push in the connected connection terminal 5 first. In this case, the electric wire 4 is grasped and the connection terminal 5 is pushed into the electric wire fitting hole 1a. Since the electric wire 4 is held, it has become difficult to pass the connection terminal 5 through the electric wire fitting hole 1a due to the folding of the electric wire 4 or the like.
[0008]
Furthermore, due to the multipolarization of the connectors, the work of assembling each connecting terminal 5 and the electric wire 4 through the wire fitting hole 1a of the integrated rubber plug 1 is time-consuming and difficult, and the integrated rubber plug 1 is used. In such a case, it is necessary to take measures for stopping the unused wire insertion hole 1a with a dummy plug or a membrane.
[0009]
Further, according to the waterproof structure of the third conventional example, it is not necessary to attach an individual rubber plug to each electric wire as in the first conventional example, and each electric wire of the integrated rubber plug 1 as in the second conventional example. The connection terminal 5 and the wire 4 need not be penetrated into the fitting hole 1a, but the resin is filled in the wire insertion part and solidified, so that it is not possible to replace the connection terminal when it is discovered or damaged, and maintenance can be performed. There are no drawbacks.
[0010]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a waterproof structure in a cable insertion portion and a method for manufacturing the same, in which assembly workability and maintenance performance are improved.
[0011]
[Means for Solving the Problems]
The technical means of the waterproof structure for achieving the above object is that the connection terminals of the electric wires in which the connection terminals are connected to the end portions of the respective conductors are inserted into the cable insertion portions provided in the housing body. In the waterproof structure in the cable insertion portion where the inner peripheral surface of the cable insertion portion and the outer peripheral surface of each electric wire are sealed in the cable insertion state respectively disposed at a predetermined position, each electric wire positioned in the cable insertion portion is A plug body that is molded on the outer peripheral surface in a state of being put together and has a slight gap on the inner peripheral surface of the cable insertion portion, and is fitted along the outer peripheral surface of the plug body. And an elastically deformable annular O-ring or rubber ring held in the holding groove and in close contact with the inner peripheral surface of the cable insertion portion.
[0012]
Further, the holder body having a cable insertion opening smaller than the plug body is detachably locked to the cable insertion portion from the outer surface side of the plug body in a state in which each electric wire is inserted into the cable insertion opening. It is good also as the structure made.
[0013]
Further, the technical means of the manufacturing method is that each connection terminal of each electric wire having a connection terminal connected to an end portion of each conductor is inserted into a cable insertion portion provided in the housing body, and each is in a predetermined position. In a method for manufacturing a waterproof structure in a cable insertion portion that seals between the inner peripheral surface of the cable insertion portion and the outer peripheral surface of each electric wire in a state where the cable is inserted, an annular O ring or rubber ring that is elastically deformable is used. After making the cable insertion state in the state where the electric wires are loosely inserted, in a state where the electric wires located on the outer side of the cable insertion portion are gathered, the outer peripheral surface thereof has a slight gap on the inner peripheral surface of the cable insertion portion. and fitting together is detachably fitted has, the O-ring or stopper which is holding groove provided that the rubber ring is held molded along its outer circumference, its In a state where the was holding the O-ring or rubber ring holding groove of the molded plug body, brought into close contact with O-ring or rubber ring to the cable insertion portion inner peripheral surface stopper fitted pushing into the cable insertion portion In the point.
[0014]
Moreover, the said O-ring or rubber ring before the electric wires to the insertion in advance through the electric wires to the cable insertion opening of the holder body having a compact cable insertion opening than said plug body, said plug The holder body may be detachably locked to the cable insertion portion in a state where the body is pushed and fitted into the cable insertion portion.
[0015]
Additionally, bisected split die of the wire longitudinal ends freely respectively elastically deformed in the cable lead-out opening edge portion facing one another situated in the soft elastic body is provided, the elastic deformation of the elastic body of the two half dies Alternatively, the plug may be molded by injecting a molding material into the cavity in a state where the electric wires are bundled and sandwiched.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an exploded perspective view of a waterproof connector 10, and a housing body 11 formed of resin or the like of the waterproof connector 10 includes a cable. There are provided a large number of terminal mounting portions 11a that are fitted to the connection terminals 13 that are crimped to the end portions of the respective electric wires 12 as members and are connected to the respective conductors, and are mounted in a retaining manner. An electric wire insertion portion 11b is provided as a cable insertion portion which is located on one end surface side of the portion 11a and protrudes in a substantially rectangular tube shape in which each electric wire 12 is inserted.
[0017]
Further, near the end of each electric wire 12, there is provided a plug body 14 formed by molding each electric wire 12 in the central portion, and the plug body 14 has a slight gap on the inner peripheral surface of the electric wire insertion portion 11b. Thus, it is formed in a slightly small, substantially rectangular flat plate shape that is detachably fitted, and is fixed to the outer peripheral surface of each electric wire 12 in a liquid-tight manner.
[0018]
Furthermore, a holding groove 14a (see FIG. 4) is provided along the outer peripheral surface of the plug body 14 so that an O-ring 15 as an elastically deformable annular seal ring body is detachably attached. When the plug body 14 is fitted to the wire insertion portion 11b while the O-ring 15 is held on both the inner peripheral surface of the wire insertion portion 11b and the outer peripheral surface of the plug body 14 due to elastic deformation of the O-ring 15. The O-ring 15 is in close contact with the sealing state.
[0019]
Moreover, the holder body 16 shape | molded with the resin etc. which hold | suppresses the plug body 14 with which the electric wire insertion part 11b was mounted | worn from the outer surface side is provided, and the holder body 16 is fitted in the electric wire insertion part 11b so that it can detachably fit. It is formed in a substantially rectangular flat plate shape, and is provided with an elongated wire insertion opening 16a as a cable insertion opening through which each electric wire 12 is inserted in a loose shape at the center portion, which is smaller than the plug body 14.
[0020]
Further, locking piece portions 16b are respectively extended at both side edge portions of the holder body 16, and locking holes 16c formed in the locking piece portions 16b are provided on both sides of the outer peripheral surface of the wire insertion portion 11b. Each of the protruding protrusions 11c is detachably locked so that the outer surface of the plug 14 fitted in the wire insertion portion 11b is pressed and held in a retaining shape. ing.
[0021]
Next, the manufacturing method will be described with reference to FIGS.
[0022]
First, each electric wire 12 having the connection terminal 13 crimped at the end is inserted through the electric wire insertion opening 16a and the O-ring 15 of the holder body 16, and then each connection terminal 13 passes through the electric wire insertion portion 11b of the housing body 11. Then, each terminal mounting portion 11a is mounted in a predetermined manner at a predetermined position. At this time, each connection terminal 13 disposed at a predetermined position is held in a retaining shape by a lance 18 provided in the housing body 11 and a retainer 19 attached to the housing body 11. In addition, the waterproof ring 20 that is elastically deformable by the retainer 19 is also held in a retaining shape.
[0023]
After the connection terminals 13 are mounted, the electric wires 12 are bundled and sandwiched by the divided dies 21 and 22 divided in two near the outer side of the electric wire insertion portion 11b, for example, from both upper and lower sides. At this time, soft elastic bodies 25 that are elastically deformable are provided by bonding or the like along the cable drawing opening edges 23 and 24 that are located on both sides in the longitudinal direction of the electric wires 12 of the divided dies 21 and 22 and face each other. In the state where the electric wires 12 are bundled and sandwiched by elastic deformation of the elastic body 25, the elastic members 25 are configured to be in close contact with the outer peripheral portion of the bundled electric wires 12.
[0024]
And in the state which sandwiched each electric wire 12 by both split dies 21 and 22, in the cavity 21a and 22a constituted by both split dies 21 and 22, thermosetting resin, thermoplastic resin, hot melt adhesive, etc. The mold material is filled and injected through an injection path (not shown) to be solidified, and the plug 14 is molded. At this time, it is preferable from the viewpoint of productivity to use a hot-melt adhesive that does not require heating of the divided dies 21 and 22 in advance. For example, when the covering material of the electric wire 12 is PVC (polyvinyl chloride), a dimer acid-based polyamide may be used, and when the covering material of the electric wire 12 is PE (polyethylene), an olefin-based hot melt adhesive may be used.
[0025]
Further, the inner surfaces of the divided dies 21 and 22 are provided with protrusions 21b and 22b along the circumferential direction, and the plug body 14 taken out from the cavities 21a and 22a by mold opening has an outer peripheral surface thereof. A holding groove 14a is formed along the.
[0026]
Next, the O-ring 15 is held in a fitting state through the elastic deformation in the holding groove 14a of the molded plug body 14, and the plug body 14 is held in the wire insertion portion 11b in the held state. Press fit. By this push-fitting, the O-ring 15 is elastically deformed, and a sealed state in which the O-ring 15 is in close contact with both the inner peripheral surface of the wire insertion portion 11b and the outer peripheral surface of the plug body 14 is obtained.
[0027]
In this state, the holder body 16 may be moved to the wire insertion portion 11b side, and the locking protrusion 11c may be locked in the locking hole 16c of each locking piece 16b.
[0028]
As described above, according to the manufacturing method of the present embodiment, since the plug body 14 is molded in close contact with the outer periphery of the electric wires 12 in a bundled state, a rubber plug is provided for each electric wire as in the past. There is no need for mounting, and there is no need to let each connection terminal 5 or each wire 4 penetrate through the wire fitting hole 1a of the integral rubber plug 1, so that the assembly workability can be improved and it is suitable for miniaturization and multipolarization.
[0029]
In addition, when the O-ring 15 is held in the holding groove 14a of the plug body 14, the wire insertion section 11b is pushed and fitted into the wire insertion section 11b so that the inner surface of the wire insertion section 11b and the outer surface of the plug body 14 are spaced from each other. Since it can be sealed, the plug 14 can be detached from the wire insertion part 11b when the connection terminal 13 is mounted on the terminal mounting part 11a when a mounting defect is found or when the connection terminal 13 is damaged. Maintenance can be improved.
[0030]
Furthermore, since the flexible elastic bodies 25 are provided at the positions of the cable drawing opening edges 23 and 24 of the respective divided dies 21 and 22, they are well adhered to the outer peripheral surfaces of the respective electric wires 12, and are formed in the cavities 21 a and 22 a. Leakage when filling and injecting the mold material can be well prevented.
[0031]
Also, the holder body 16 can effectively prevent the plug body 14 from being detached from the wire insertion portion 11b.
[0032]
7 and 8 show a second embodiment, which has a structure in which FFC27 (flexible flat cable) is adopted as a cable member. Note that components similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0033]
Also in this embodiment, if the plug body 14 is molded on the outer peripheral surface of the FFC 27 and the O-ring 15 is held, it is pushed into the cable insertion portion 11d as described above to obtain a sealed state.
[0034]
Therefore, also in this embodiment, the same advantage as the first embodiment can be obtained.
[0035]
FIG. 9 shows a third embodiment, which is a structure adopted in the cable insertion portion 28a of the housing body 28 formed of a case such as a unit case such as an ECU or a module case. Note that the same components as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0036]
That is, the housing body 11 attached to the FFC 27 is detachably connected to the connector portion 30 of the substrate 29 accommodated in the housing body 28, and the FFC 27 portion inserted into the cable insertion portion 28a is connected to the FFC 27 portion. Similarly, the plug body 31 is molded and sealed with an O-ring 15 held by the plug body 31.
[0037]
Therefore, also in this embodiment, the same advantage as the first embodiment can be obtained.
[0038]
In addition, in each said embodiment, although the structure which employ | adopted many electric wires 12 and FFC27 as a cable member is shown, the twist wire of the structure which twisted the some electric wire, FPC (flexible printed circuit board), a ribbon cable, others A sheet-like flat cable or the like may be used, and a structure in which a plurality of types of wires are mixed, such as a combination of the electric wire 12 and the FFC 27, may be used. In this case, the plugs 14 and 31 are molded and can be sealed well regardless of the cross-sectional shape of the wire.
[0039]
Moreover, although the structure using the O-ring 15 as a seal ring body is shown, a rubber ring having a plurality of lips like the waterproof ring 20 may be used.
[0040]
【The invention's effect】
As described above, according to the waterproof structure in the cable insertion portion and the manufacturing method thereof according to the present invention, the cable is inserted after the respective wires are loosely inserted into the elastically deformable annular O-ring or rubber ring. In a state where the electric wires located on the outer side of the insertion part are gathered, they are fitted to the outer peripheral surface of the cable insertion part with a slight gap on the inner peripheral surface of the cable insertion part, and along the outer peripheral surface. the O ring or plug body has holding grooves provided in which a rubber ring is held molded, while being held with O-ring or rubber ring holding groove of the molded plug body, the cable inserted through the plug body the O-ring or a rubber ring is intended to come into close contact with the cable insertion portion inner circumferential surface fitted pushing the portion, together it can be improved and miniaturization of the assembling workability, maintenance after assembling There is an advantage that attained also improvement of gender.
[0041]
In addition, if the holder body is detachably locked to the cable insertion portion in a state where the plug body is pushed into the cable insertion portion, the holder body can effectively prevent the plug body from being detached from the cable insertion portion. There are advantages.
[0042]
Further, each of the two divided dies is provided with soft elastic bodies that are elastically deformable at the cable drawing opening edges located on both sides in the longitudinal direction of the electric wire and facing each other. If a plug is molded by injecting a molding material into the cavity with the electric wires bundled and sandwiched, the elastic body is elastically deformed and adheres well to the outer peripheral surface of each electric wire. There is an advantage that leakage during filling and injection can be prevented well.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a waterproof structure according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of the same manufacturing process.
FIG. 3 is an explanatory diagram of the same manufacturing process.
FIG. 4 is an explanatory diagram of the same manufacturing process.
FIG. 5 is an explanatory diagram of the same manufacturing process.
FIG. 6 is an explanatory diagram of the same manufacturing process.
FIG. 7 is a partial perspective view showing a second embodiment.
FIG. 8 is a sectional view of the assembled state.
FIG. 9 is a cross-sectional view showing a third embodiment.
FIG. 10 is an exploded perspective view showing an example of a conventional waterproof structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Waterproof connector 11 Housing body 11a Terminal mounting part 11b Electric wire insertion part 11c Locking protrusion part 12 Electric wire 13 Connection terminal 14 Plug body 14a Holding groove 15 O ring 16 Holder body 16a Electric wire insertion opening 16b Locking piece part 16c Locking hole 21 , 22 Split die 21a, 22a Cavity 23, 24 Opening edge 25 for cable drawing out Elastic body 27 FFC
28 Housing 28a Cable insertion part 31 Plug

Claims (5)

In the cable insertion state in which each connection terminal of each electric wire in which the connection terminal is connected to the end portion of each conductor is inserted into the cable insertion portion provided in the housing body and arranged at a predetermined position, respectively, the cable In the waterproof structure in the cable insertion portion where the gap between the inner peripheral surface of the insertion portion and the outer peripheral surface of each wire is sealed,
A plug body that is molded on the outer peripheral surface of each electric wire located in the cable insertion portion and is fitted in a freely detachable manner with a slight gap on the inner peripheral surface of the cable insertion portion,
An elastically deformable annular O-ring or rubber ring that is held in a holding groove provided along the outer peripheral surface of the plug body and is in close contact with the inner peripheral surface of the cable insertion portion;
The waterproof structure in the cable insertion part characterized by comprising. The holder body having a smaller cable insertion opening than the plug body is detachably locked to the cable insertion portion from the outer surface side of the plug body in a state where the electric wires are inserted into the cable insertion opening. The waterproof structure in the cable insertion portion according to claim 1. In the cable insertion state in which each connection terminal of each electric wire in which the connection terminal is connected to the end portion of each conductor is inserted into the cable insertion portion provided in the housing body and arranged at a predetermined position, respectively, the cable In the manufacturing method of the waterproof structure in the cable insertion portion that seals between the inner peripheral surface of the insertion portion and the outer peripheral surface of each electric wire ,
After said cable insertion state while loosely inserted the electric wires to the O-ring or rubber ring of the elastic deformable annular, outer peripheral surface thereof in a state that summarizes the respective wires situated in the outer portion of the cable insertion portion In addition, the cable insertion portion is provided with a holding groove that is detachably fitted to the inner circumferential surface of the cable insertion portion and that holds the O-ring or the rubber ring along the outer circumferential surface. In a state where the O-ring or the rubber ring is held in the holding groove of the molded plug body, the plug body is pushed into the cable insertion portion to fit and the O-ring or rubber ring is inserted into the cable. A method for manufacturing a waterproof structure in a cable insertion portion, wherein the waterproof portion is closely attached to the inner peripheral surface of the portion. Before the insertion of the electric wires to the O-ring or rubber ring, the said cable insertion opening of the holder body having a compact cable insertion opening than said plug body previously inserted electric wires, said plug body 4. The method of manufacturing a waterproof structure in a cable insertion portion according to claim 3, wherein the holder body is detachably locked to the cable insertion portion in the state of being pushed and fitted into the cable insertion portion. Bisected split die of the wire longitudinal ends freely respectively elastically deformed in the cable lead-out opening edge portion facing one another situated in the soft elastic body is provided, each by the elastic deformation of the elastic body of the two half dies 5. The method for manufacturing a waterproof structure in a cable insertion portion according to claim 3, wherein the plug is molded by injecting a molding material into the cavity in a state where the electric wires are bundled and sandwiched.

Images