JP5029505B2 - Waterproof structure of connector connection - Google Patents

Description

  The present invention relates to a waterproof structure of a connector connecting portion, and more specifically, in a connector connected to a wire harness terminal, it is intended to prevent water from entering from the connecting portion between the connector and the wire harness.

When the connector is connected to the terminal of the wire group constituting the wire harness, the terminal connected to each wire terminal is inserted and locked in each terminal receiving chamber of the connector, so that the wire drawn from the terminal receiving chamber The section until the two are converged (the so-called lower part of the connector neck) is in a state where the electric wires are fanned out. Therefore, the waterproof tube covering the part where the electric wire group is converged cannot be put on the lower part of the connector neck.
When a connector connected to a wire harness is attached to a wet area of a vehicle, it is necessary to prevent water from entering the terminal accommodating chamber of the connector by waterproofing the lower portion of the connector neck.
Therefore, conventionally, as shown in FIG. 10, a protective cover 4 is used that covers from the outer surface of the housing 2 of the connector 1 to the insulating coating portion 3 a of the wire group 3 at the connector neck position.

  The protective cover 4 includes a connector housing portion 5 that houses the housing 2 of the connector 1 and a cylindrical wire lead portion 6 that covers the insulating coating portion 3a of the wire group 3 drawn from the connector 1 with an elastic material. It is molded (JP-A-6-124746, etc.).

  When this type of protective cover 4 is used, the converged wire group 3 is also covered with a protective tube 7 for waterproofing, and the tip of the protective tube 7 is externally fitted to the wire lead-out portion 6 of the protective cover 4 and integrated with tape 8. It is wrapped around and fixed.

  However, when the inner diameter of the protective tube 7 is small, it is difficult to attach the protective tube 7 to the wire lead-out portion 6 and workability is deteriorated. On the other hand, when the inner diameter of the protective tube 7 is large, a gap S1 is created between the outer peripheral surface of the wire lead-out portion 6 and the inner peripheral surface of the protective tube 7 as shown in FIG. By the time, the wire lead-out portion 6 and the protective tube 7 are easily misaligned, and the workability is also poor. When the inner diameter of the protective tube 7 is large, even if the wire drawing portion 6 is wound and fixed with the tape 8, as shown in FIG. 11B, the winding state of the tape 8 becomes distorted by the gap S1, Even if the tape 8 is wound around the gap S2 generated in the tape 8 or when the tape 8 is wound so as to crush the gap S1, as shown in FIG. There is a problem in that a new gap S3 is formed between the tape 8 and water easily enters.

JP-A-6-124746

  The present invention has been made in view of the above problems, and in the waterproof structure of the connector connecting portion using the protective cover and the protective tube, the external fitting work of the protective tube to the cylindrical wire lead-out portion of the protective cover is performed. It aims at making it easy and improving waterproof performance.

In order to solve the above-mentioned problem, the present invention connects a connector to the end of a wire group, and on the outer peripheral surface of the wire group at a connector neck lower part that is pulled out from the terminal housing portion of the connector from the housing outer surface of the connector. While covering a dip-molded protective cover, the wire group is covered with a protective tube,
A cylindrical wire lead-out portion covering the wire group of the protective cover is integrally provided with a plurality of protruding portions in the axial direction bulging outward, while the inner peripheral length A2 of the protective tube and the wire The outer peripheral length A1 of the portion having the protruding portion of the drawer portion is set to A1 ≧ A2,
The protective tube is externally fitted so as to squeeze the protruding portion into the electric wire extraction portion of the protective cover, and from the outer peripheral side of the protective tube to the outer surface of the electric wire extraction portion of the protective cover at the distal end side of the fitting portion. Provided is a waterproof structure for a connector connecting portion, characterized in that an adhesive tape is wound around and fixed.

In this way, by providing the protruding portion that bulges outward in the wire lead-out portion of the protective cover, the outer peripheral length A1 of the portion having the protruding portion of the wire lead-out portion is set to be equal to or greater than the inner peripheral length A2 of the protective tube. The inner peripheral surface of the protective tube and the tip of the protruding portion can be brought into contact with each other, and the protective tube can be externally fitted to the wire lead-out portion without any gap.
Accordingly, it is possible to prevent water from entering the protective tube and the protective cover from between the wire lead-out portion of the protective cover and the protective tube. In addition, since it is not necessary to crush the protective tube when the protective tube and the wire lead-out part are fixed with tape, it is possible to prevent a gap from being generated between the deformed protective tube and the tape, thereby improving the waterproof property. Can do.

Further, since the resistance can be obtained by always contacting the inner peripheral surface of the protective tube and the tip of the protruding portion, the protective tube and the wire lead-out are required until the protective tube and the wire lead-out portion are fixed with tape. It is possible to prevent the portion from being displaced or detached.
Furthermore, the contact area compared to the conventional case where the inner peripheral surface of the protective tube and the outer peripheral surface of the wire lead-out portion are in surface contact with each other due to the contact between the inner peripheral surface of the protective tube and the tip of the protruding portion. Since the frictional resistance at the time of inserting the protective tube is reduced, the external fitting insertion work of the protective tube to the wire lead-out portion can be easily performed, and the workability can be improved.

The protruding portion formed on the wire lead-out portion of the protective cover is an annular convex portion, and the annular convex portion is provided at a constant pitch in the axial direction, and the electric wire leading portion is provided with a bellows portion.
Or the protrusion part formed in the electric wire drawer | drawing-out part of the said protective cover is made into the semicircular convex part, and this convex part is provided continuously in the axial direction.
Or the protrusion part formed in the electric wire extraction part of the said protective cover is provided in a part of circumferential direction, and the protrusion part is provided in zigzag arrangement in the axial direction.

  As long as the connector connected to the electric wire group is disposed in the wet area, it can be applied to either a four-wheeled vehicle or a two-wheeled vehicle.

  As described above, according to the present invention, the protruding portion that can be crushed and deformed is bulged outwardly in the wire drawing portion of the protective cover, and the outer peripheral length A1 of the portion of the wire drawing portion that has the protruding portion. Since the inner peripheral length A2 of the protective tube is A1 ≧ A2, the inner peripheral surface of the protective tube is always in elastic contact with the tip of the protruding portion, and the inner peripheral surface of the protective tube and the outer peripheral surface of the wire lead-out portion The gap can be filled with the protrusion. Therefore, the protective tube can be externally fitted to the wire lead-out portion without any gap, and water can be reliably prevented from entering the protective cover and the protective tube.

In addition, when the protective tube is wrapped around and fixed to the wire lead-out part of the protective cover with tape, it is not necessary to crush the protective tube to fill the gap, so that it becomes a water infiltration path between the crushed protective tube and the tape. It is also possible to prevent a gap from occurring.
Furthermore, since the inner peripheral surface of the protective tube can always be brought into contact with the tip of the protruding portion to obtain resistance, until the protective tube is fixed to the wire drawing portion with tape, Misalignment and disconnection can be prevented, and workability can be improved.
Furthermore, the projecting portion reduces the contact area between the inner peripheral surface of the protective tube and the outer peripheral surface of the wire lead-out portion, can reduce the frictional resistance, and the projecting portion can be crushed and deformed. The external fitting insertion work to the electric wire extraction part of a protection tube can be performed easily.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In any of the embodiments, the connector 15 is connected to the terminal of the electric wire group 10 arranged in the engine room of the automobile that is the flooded area, and the present invention is applied to the waterproof structure of the connection portion between the connector 15 and the electric wire group 10. Applicable.

1 to 4 show a first embodiment of the present invention.
As shown in FIG. 1A, the connecting portion between the connector 15 and the wire group 10 is an electric wire 11 drawn from each terminal accommodating portion (not shown) of the connector 15 from the outer surface of the housing 16 of the connector 15. The protective cover 20 is placed over the lower part of the connector neck that is spread in a fan shape until the two are converged.
Each electric wire 11 connected to the connector 15 is a round electric wire in which a core wire 11a is covered with an insulating covering portion 11b. A terminal (not shown) is exposed by peeling off the insulating covering portion 11b at a terminal to be inserted into the connector. ). These electric wires are converged and inserted into a protective tube 30 made of vinyl chloride for waterproofing.

  As shown in FIG. 2 (A), the protective cover 20 is formed of a cylindrical body having both ends opened by dip molding with vinyl chloride. The protective cover 20 includes a rectangular cylindrical connector housing portion 21 that houses the housing 16 of the connector 15, and a cylindrical wire lead-out portion 22 that covers a connector neck lower portion of the wire group 10. 23 is formed integrally in the axial direction through 23.

  A plurality of projecting portions 24 each including an annular convex portion having an inverted V-shaped cross section that bulges integrally from the inner peripheral surface side toward the outer peripheral surface side are continuously provided in the axial center portion of the wire lead-out portion 22 in the axial direction. A bellows portion 25 is provided. The protrusion 24 is flexible and can be deformed.

  As shown in FIG. 2B, the outer peripheral length A <b> 1 of the portion having the protruding portion 24 of the wire lead-out portion 22 is set larger than the inner peripheral length A <b> 2 of the protective tube 30.

  When the protective tube 30 is externally fitted to the wire lead-out portion 22 of the protective cover 20, the protective tube 30 is inserted while crushing each protrusion 24 of the bellows portion 25 as shown in FIG. As shown in FIG. 3B, the distal end portion 31 of the protective tube 30 is made to reach the back end 26 of the bellows portion 25. Finally, as shown in FIGS. 1 and 4, an adhesive tape 35 is wound and fixed from the outer peripheral surface 27 of the wire lead-out portion 22 of the protective cover 20 to the outer peripheral surface of the protective tube 30.

  In this way, the protruding portion 24 that bulges outward is formed in the wire lead-out portion 22 of the protective cover 20, and the outer peripheral length A1 of the portion having the protruding portion 24 of the wire lead-out portion 22 is set within the protective tube 30. By setting it to the circumference A2 or less, as shown in FIGS. 1A and 1B, the inner peripheral surface 32 of the protective tube 30 and the protruding end 24a of the protruding portion 24 can always be brought into contact with each other. Accordingly, the gap 28 between the inner peripheral surface 32 of the protective tube 30 and the outer peripheral surface 27 of the wire lead-out portion 22 can be filled with the protruding portion 24, and water enters the protective cover 20 and the protective tube 30. This can be surely prevented.

  Further, when the adhesive tape 35 is wound, there is no need to crush and deform the protective tube 30 in order to fill the gap 28, so that a gap serving as a water intrusion path is formed between the deformed protective tube 30 and the adhesive tape 35. Occurrence can also be prevented.

  Furthermore, when the protective tube 30 is externally inserted into the wire lead-out portion 22 of the protective cover 20, the inner peripheral surface 32 of the protective tube 30 is connected to the outer peripheral surface 27 of the wire lead-out portion 22 as shown in FIG. Since the surface does not come into contact with the protruding end 24a of the protruding portion 24, the contact area is small and the frictional resistance is also small. The protrusion 24 is formed so as to be crushed and deformed. Therefore, the work of inserting the protective tube 30 into the wire lead-out portion 22 is facilitated, and workability can be improved.

  Furthermore, as shown in FIG. 3B, the inner peripheral surface 32 of the protective tube 30 always comes into contact with the protruding end portion 24a of the protruding portion 24 to obtain resistance, so that the protective tube 30 and the wire lead-out portion 22 The protective tube 30 and the wire lead-out portion 22 can be prevented from being displaced or detached before the wire is wound and fixed with the adhesive tape 35. From this point, workability can be improved.

5 and 6 show a second embodiment of the present invention.
A bellows portion 25 is formed at the central portion in the axial direction of the wire lead-out portion 22 of the protective cover 20. The bellows portion 25 is formed by providing a plurality of projecting portions 24 each having an annular convex portion with a constant pitch in the axial direction. Is a saw blade.

  Specifically, the protection tube insertion side surface 24b of each protrusion 24 is inclined in a taper shape in the insertion direction of the protection tube 30, while the anti-insertion side surface 24c is erected substantially perpendicular to the axial direction. Other configurations are the same as those in the first embodiment.

  Thereby, as shown in FIG. 6A, the protrusion 24 is easily pushed down in the insertion direction of the protection tube 30, but as shown in FIG. 6B, it falls down in the removal direction of the protection tube 30. Since it is difficult to attach the protective tube 30 to the wire lead-out portion 22, it is possible to make the structure capable of regulating the removal of the protective tube 30.

7 and 8 show a third embodiment of the present invention.
A plurality of protrusions 24 having a reverse V-shaped cross section made of a semicircular convex portion are provided continuously in the axial direction at the central portion in the axial direction of the wire lead-out portion 22 of the protective cover 20.
As shown in FIG. 7B, the protruding portion 24 gradually decreases its protruding height toward both ends in the circumferential direction, and the both ends are smoothly connected to the outer peripheral surface 27 of the wire lead-out portion 22.
Further, the outer peripheral length A <b> 1 of the wire lead-out portion 22 of the portion having the protruding portion 24 is set to be equal to or shorter than the inner peripheral length A <b> 2 of the protective tube 30. Other configurations are the same as those in the first embodiment.

FIG. 9 shows a fourth embodiment of the present invention.
At the central portion in the axial direction of the wire lead-out portion 22 of the protective cover 20, the projecting portions 24 in which convex portions having a reverse V-shaped cross section are continuously provided in the circumferential direction are staggered in the axial direction.
The outer peripheral length A1 of the wire lead-out portion 22 of the portion having the protruding portion 24 is set to be equal to or shorter than the inner peripheral length A2 of the protective tube 30.
Other configurations are the same as those in the first embodiment.

  Also in the third embodiment and the fourth embodiment, as shown in FIGS. 7A and 7B and FIGS. 9A and 9B, the inner peripheral surface 32 of the protective tube 30 and the wire lead-out of the protective cover 20 The protrusions 24 a of the protrusions 24 of the portion 22 come into contact with each other. Therefore, the protrusions 24 fill the gaps 28 between the inner peripheral surface 32 of the protective cover 20 and the outer peripheral surface 27 of the wire lead-out portion 22. Can improve waterproofness.

  Further, at least the protruding end 24a of each protruding portion 24 of the wire lead-out portion 22 and the inner peripheral surface 32 of the protective tube 30 are in contact with each other, so that resistance can be obtained and displacement of the protective tube 30 can be prevented. By reducing the contact area, the frictional resistance can be reduced, and the work of attaching the protective tube 30 to the wire lead-out portion 22 can be facilitated.

The waterproof structure of the connector connection part which concerns on 1st embodiment of this invention is shown, (A) is an axial sectional view, (B) is a BB sectional drawing of (A). A protective cover and a protective tube are shown, (A) is a perspective view, (B) is a BB line sectional view of (A). (A) (B) is explanatory sectional drawing which shows the process of fitting a protection tube on a protection cover. It is an external appearance top view which shows the state which wound and fixed the protective cover and the protective tube. It is sectional drawing which shows the waterproof structure of the connector connection part which concerns on 2nd embodiment. It is principal part sectional drawing which shows the deformation | transformation state of the protrusion part of the electric wire drawer | drawing-out part of the protective cover shown in FIG. 5, (A) shows a deformation | transformation state when a protection tube is externally inserted, (B) is a protection tube. The deformation state when an external force in the pulling direction is applied is shown. The waterproof structure of the connector connection part which concerns on 3rd Embodiment is shown, (A) is an axial direction sectional drawing, (B) is a BB sectional drawing of (A). It is a perspective view which shows the protective cover which concerns on 3rd Embodiment. The waterproof structure of the connector connection part which concerns on 4th Embodiment is shown, (A) is a cross-sectional explanatory drawing, (B) is a BB sectional drawing of (A). It is a figure which shows a prior art example. (A) (B) (C) is a figure which shows the trouble of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric wire group 11 Electric wire 11a Core wire 11b Insulation coating | cover part 15 Connector 16 Housing 20 Protection cover 22 Electric wire extraction part 24 Projection part 30 Protection tube 35 Adhesive tape

Claims (5)

While connecting the connector to the terminal of the wire group, the outer peripheral surface of the wire group of the lower part of the connector drawn from the terminal housing portion of the connector from the housing outer surface of the connector is covered with a dip-formed protective cover, Cover the wire group with a protective tube,
A cylindrical wire lead-out portion covering the wire group of the protective cover is integrally provided with a plurality of protruding portions in the axial direction bulging outward, while the inner peripheral length A2 of the protective tube and the wire The outer peripheral length A1 of the portion having the protruding portion of the drawer portion is set to A1 ≧ A2,
The protective tube is externally fitted so as to squeeze the protruding portion into the electric wire extraction portion of the protective cover, and from the outer peripheral side of the protective tube to the outer surface of the electric wire extraction portion of the protective cover at the distal end side of the fitting portion. A waterproof structure for a connector connecting portion, characterized in that an adhesive tape is wound around and fixed.   The protrusion part formed in the electric wire drawer part of the said protective cover is made into the shape which provided the annular convex part at a constant pitch in the axial direction as an annular convex part, and provided the bellows part in the said electrical wire drawer part. Waterproof structure for connector connection.   The waterproof structure of the connector connecting portion according to claim 1, wherein the protruding portion formed in the wire lead-out portion of the protective cover is a semicircular convex portion, and the convex portion is continuously provided in the axial direction.   The waterproof structure of the connector connecting portion according to claim 1, wherein the protruding portion formed in the wire lead-out portion of the protective cover is provided in a part of the circumferential direction and the protruding portions are provided in a staggered arrangement in the axial direction.   The waterproof structure for a connector connecting portion according to any one of claims 1 to 4, wherein the electric wire group is routed in a four-wheeled vehicle or a two-wheeled vehicle, and the connector is routed in a wet area.

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