JP2016012437A - Waterproof connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof connector that can suppress infiltration, into a contact portion, water, etc. which infiltrates from the gap between a core wire and a coating of a coated electrical wire.SOLUTION: A waterproof connector 10 has a terminal fitting 40 connected to a terminal of a coated electrical wire 50 in which a core wire 51 is coated with an insulation coating 53, a connector housing 20 having a cavity 21 in which the terminal fitting 40 is mounted, and a waterproof rubber plug 70 for keeping the gap between the outer peripheral surface of the coated electrical wire 50 and the inner peripheral surface of the cavity 21 under a watertight state. The coated electrical wire 50 is provided with a peeled portion 55 from which a part of the insulation coating 53 is peeled, at the opposite side to the terminal fitting 40 with respect to the waterproof rubber plug 70. The peeled portion 55 is covered with a sealing material 80 for sealing the gap between the end portion of the insulation coating 53 and the core wire 51.

Description

  The present invention relates to a waterproof connector.

  2. Description of the Related Art Conventionally, in a sealed device such as an automobile transmission, a waterproof connector is attached to a device housing in order to make an electrical connection between the inside and the outside. This type of waterproof connector is generally mounted on a device housing while sealing the connector housing with a waterproof ring, and the terminal fitting connected to the end of the covered wire is accommodated in the cavity of the connector housing. The space between and is sealed with a waterproof rubber stopper.

  By the way, although the covered electric wire has a structure in which the outer periphery of the core wire is covered with an insulating coating, the interface between the core wire and the insulating coating is not necessarily in close contact, and there is a minute gap. For this reason, even if the outer peripheral side of the covered electric wire is sealed with a waterproof rubber plug, water may enter through the gap from the end opposite to the terminal fitting of the covered electric wire. Since the gap exists continuously in the direction of the electric wire, water that has entered from the opposite end gradually moves due to surface tension, pressure difference, etc., and eventually reaches the end on the terminal fitting side. . Then, corrosion may occur at the contact portion of the terminal fitting, which may cause poor contact. Such a situation is particularly remarkable when a splice is disposed at the end of the covered electric wire.

  Therefore, a relay connector disclosed in Japanese Patent Laid-Open No. 2010-244986 (the following Patent Document 1) is known as a waterproof connector that solves such a problem. The relay connector includes a housing having first and second fitting portions into which the first and second connectors that can accommodate the first and second terminal fittings can be respectively fitted. The housing is provided with a wall that partitions the first and second fitting portions, and a bus bar passes through the wall. On the other hand, the wall is formed with a sealing hole through which the sealing material is introduced over the entire height, and the intermediate portion of the bus bar penetrating the wall is filled with the sealing material. Therefore, even if water or oil tries to enter the second connector from the first connector, the entry is blocked by the sealing material.

JP 2010-244986 A

  However, in a waterproof connector such as JP 2010-244986 A (the above Patent Document 1), since the sealing material is located between the contacts at both ends of the bus bar, the contact portion between the terminal held by the waterproof connector and the bus bar May adhere to water and oil and corrode.

  The waterproof connector disclosed in the present specification includes a terminal fitting connected to a terminal of a covered electric wire whose core wire is covered with an insulating coating, a connector housing including a cavity for housing the terminal fitting, and an outer peripheral surface of the covered electric wire. And a waterproof rubber plug that maintains a watertight state between the inner peripheral surface of the cavity, and the covered electric wire includes a part of the insulating coating on a side opposite to the terminal fitting with respect to the waterproof rubber plug. A peeled portion is provided, and the peeled portion is covered with a sealing material that seals between the end portion of the insulating coating and the core wire.

  According to such a configuration, even if a minute gap is generated at the interface between the insulation coating and the core wire, the sealing material provided on the skinned portion of the covered wire is not the end portion of the insulation coating. Since the space between the wire and the core wire is sealed, the continuity along the wire extension direction of the gap is broken. For this reason, even if water penetrates through the gap between the coating and the core wire, the entry of water is blocked by the portion of the sealing material that covers the peeled portion, and does not penetrate to the terminal fitting side.

As an embodiment of the waterproof connector disclosed in this specification, the following configuration may be adopted.
In the connector housing, a liquid reservoir is formed continuously with the housing portion of the waterproof rubber plug, and the skinned portion of the covered electric wire is placed in the liquid reservoir with the waterproof rubber plug being housed in the housing portion. It is good also as a structure which is provided so that it may be located and the said sealing material covers the said skin peeling part by pouring in the said liquid reservoir part with the said waterproof rubber stopper down.
In such a configuration, the sealing material is poured and covers the peeled portion, so that the sealing material adheres around the exposed core wire, and water can be prevented from entering. Moreover, when the sealing material is poured into the liquid reservoir, the waterproof rubber plug is stored in advance, so that the liquid sealing material does not flow to the terminal fitting side.

The connector housing may be provided with a holding member that holds the covered electric wire at a position opposite to the terminal fitting with respect to the sealing material.
In such a configuration, even if the covered electric wire receives a swaying force, the holding member holds the covered electric wire, so that the swaying motion of the covered electric wire can be suppressed, and stress is generated in the filling portion of the sealing material. Can be suppressed.

The holding member is a rubber plug having an electric wire insertion hole through which the covered electric wire is inserted, and a housing-side lip portion that is in close contact with the housing portion of the connector housing is formed on an outer peripheral surface of the rubber plug, and the rubber plug It is good also as a structure by which the electric wire side lip | rip part closely_contact | adhered to the outer peripheral surface of the said covered electric wire is formed in the inner peripheral surface of an electric wire penetration hole.
In such a configuration, since the housing-side lip portion and the electric wire-side lip portion are in close contact with the housing accommodating portion and the covered electric wire, the housing-side lip portion is also provided with waterproofness, which can suppress the intrusion of water or the like into the waterproof connector. it can.

A plurality of the cavities are formed in the connector housing, and terminal fittings to which the covered electric wires are connected are individually accommodated in the cavities, and a plurality of the waterproof rubber plugs are provided individually for the covered electric wires, The rubber plug may have a configuration in which a plurality of wire insertion holes through which the plurality of covered wires are individually inserted are formed.
In such a configuration, the waterproof rubber plug is mounted in the cavity simultaneously with the individual terminal fittings, while the rubber plug is mounted collectively after being covered with the sealing material. At that time, the rubber plugs are not individually attached to the plurality of cavities, but can be attached together, leading to a reduction in man-hours.

  According to the waterproof connector disclosed in this specification, it is possible to prevent water or the like that has entered from a gap between the core wire of the covered electric wire and the covering from entering the contact portion.

Sectional drawing of the waterproof connector in Embodiment 1 Cross-sectional view of a covered wire with a waterproof rubber plug and a batch rubber plug Sectional view of the state where the skinned part is provided on the covered wire Sectional view of the state before pouring the sealing material into the waterproof connector Sectional view of the state after the sealing material is poured into the waterproof connector

<Embodiment 1>
The first embodiment will be described with reference to FIGS. 1 to 5. The waterproof connector 10 in the present embodiment has a connector housing 20 made of synthetic resin. Inside the connector housing 20, a terminal fitting 40 connected to the end of the covered electric wire 50 is held and a waterproof rubber described later. A plurality of cavities 21 for accommodating the stoppers 70 are formed. In addition, since the cavity 21 is provided with two or more along with the direction which penetrates the paper surface of FIG. 1, only one is shown in figure. The connector housing 20 is fitted into a mounting hole provided in a case of a device (not shown) such as a vehicle transmission, and is bolted to the case by a mounting portion 60 with a collar 61. A rubber ring 65 is fitted on the outer peripheral surface of the connector housing 20, and the rubber ring 65 seals between the inner peripheral surface of the mounting hole on the device side and the outer peripheral surface of the connector housing 20.

As shown in FIG. 2, the covered electric wire 50 has a configuration in which the core wire 51 is covered with an insulating coating 53, and the terminal fitting 40 is connected to the core wire 51 exposed by peeling off the insulating coating 53 at the tip portion.
As shown in FIG. 2, the terminal fitting 40 is formed by press-molding a conductive metal plate, and includes a main body portion 41 that has a substantially rectangular tube shape, and a wire connection portion 43 that continues to the rear of the main body portion 41. ing. The main body 41 is connected to a tab-like mating terminal 91 (see FIG. 1) held by the mating connector 90. In addition, the wire connection portion 43 includes a wire barrel portion 45 that is crimped to the core wire 51 of the covered wire 50 and an insulation barrel portion 47 that is crimped to a waterproof rubber plug 70 that is externally fitted to the covered wire 50.

As shown in FIG. 2, the waterproof rubber plug 70 has a cylindrical shape into which the covered electric wire 50 can be inserted as a whole, a small diameter portion 71 that is caulked to the insulation barrel portion 47, and the inner wall 21 </ b> A of each cavity 21. A large-diameter portion 73 that seals between the covered electric wire 50 is provided. On the outer peripheral surface of the large diameter portion 73, two lips formed in an annular shape along the circumferential direction protrude and are provided. And when this lip | stick closely_contact | adheres to the inner wall 21A of each cavity 21, between the inner wall 21A of each cavity 21 and the covered electric wire 50 is sealed.
The connector housing 20 is formed with an annular fitting groove 31 that receives the hood portion 93 of the mating connector 90 in a fitted state, and an inter-connector rubber plug 33 that is in close contact with the hood portion 93 is disposed at the back end portion thereof. Has been.

  As shown in FIG. 1, the connector housing 20 is attached in a form extending along the axial direction of the covered electric wire 50, and will be described below with the front end side of the covered electric wire 50 as the front. Each cavity 21 of the connector housing 20 is provided so as to penetrate the connector housing 20 in the front-rear direction, and as shown in FIG. 1, a terminal housing portion that houses the main body portion 41 and the wire connection portion 43 of the terminal fitting 40. 21B and a rubber plug housing portion 21C for housing the waterproof rubber plug 70. The terminal accommodating portion 21B of the cavity 21 is provided with a lance 29 that forms a cantilever shape and projects forward. The lance 29 is formed in the lower part of the terminal holding portion 21 and locks the main body portion 41 of the terminal fitting 40. The terminal accommodating portion 21B has a substantially rectangular shape in accordance with the shape of the terminal fitting 40 rectangular tube-shaped main body portion 41, and gradually increases in size toward the cylindrical rubber stopper accommodating portion 21C at the rear end portion. A step is formed between the rubber plug housing portion 21 </ b> C and the step is the front of the waterproof rubber plug 70.

  A liquid reservoir 25 is formed behind each rubber plug housing portion 21 </ b> C of the connector housing 20 (on the side opposite to the terminal fitting 40 across the waterproof rubber plug 70). One liquid reservoir 25 is provided in the connector housing 20 so as to communicate with the rear opening of each rubber plug housing portion 21C and open rearward collectively. That is, when viewed from the rear, each cavity 21 is recessed so as to penetrate from the front end face of the liquid reservoir 25 toward the front side. And the level | step difference which has a taper is formed between the liquid reservoir part 25 and each rubber stopper accommodating part 21C.

  As shown in FIGS. 3 and 4, a peeled portion 55 is formed on the covered electric wire 50 behind the waterproof rubber plug 70 attached to the covered electric wire 50. The skinned portion 55 is formed by stripping the insulating coating 53 of the covered electric wire 50 over the entire circumference, and the core wire 51 is exposed at the skinned portion 55.

  Then, the sealing material 80 is filled in the liquid reservoir 25 and the rear end portion of the rubber stopper accommodating portion 21C of each cavity 21 so as to cover the peeled portion 55, and the core wire 51 exposed at the peeled portion 55 is sealed. ing. The sealing material 80 is made of an epoxy resin, a silicone resin, or the like, has water / oil resistance, and has excellent adhesion to the core wire 51.

  In the connector housing 20, as shown in FIGS. 4 and 5, a collective housing portion 27 is provided behind the liquid reservoir portion 25. A step 27 </ b> A is formed between the collective container 27 and the liquid reservoir 25 so that the area of the collective container 27 is larger than that of the liquid reservoir 25. Further, the collective housing portion 27 is opened rearward and accommodates the rubber plug 75.

  The rubber plug 75 has a plurality of electric wire insertion holes 77 through which the plurality of covered electric wires 50 can be inserted. In addition, a housing-side lip portion 75 </ b> A that is formed in an annular shape along the circumferential direction protrudes from the outer peripheral surface of the rubber plug 75. The housing-side lip portion 75A is in close contact with the inner wall of the collective housing portion 27. On the inner peripheral surface of each electric wire insertion hole 77, an electric wire side lip portion 77A formed in an annular shape along the circumferential direction protrudes and is provided. And this electric wire side lip part 77A closely_contact | adheres to the outer peripheral surface of the covered electric wire 50. FIG. Thus, the housing side lip portion 75A and the wire side lip portion 77A are in close contact with the inner wall of the collective housing portion 27 and the covered electric wire 50, so that the space between the inner wall of the collective housing portion 27 and the covered electric wire 50 is sealed.

Next, the assembly procedure and operation of the waterproof connector 10 of the present embodiment configured as described above will be described.
First, each covered electric wire 50 is passed through the rubber plug 75 and further passed through each waterproof rubber plug 75. As shown in FIG. 2, the insulation coating 53 is peeled off at the end of each covered electric wire 50, and the wire barrel portion 45 is crimped to the exposed core wire 51, and the small diameter portion 71 of the waterproof rubber plug 70 and the insulation are sealed. The insulation barrel portion 47 is pressure-bonded to the coating 53. Then, as shown in FIG. 3, the insulation coating 53 of each covered wire 50 is peeled off behind the waterproof rubber plug 70 to form a peeled portion 55.

  The covered electric wires 50 with the terminal fittings 40 thus formed are inserted into the cavities 21 from the rear. When the terminal fitting 40 reaches the proper insertion position, as shown in FIG. 4, the lance 29 is fitted into the recess formed in the lower surface of the main body 41 and is held in the cavity 21 in a state of being prevented from coming off. Further, the waterproof rubber plug 70 is stopped at the step between the terminal accommodating portion 21B and the rubber plug accommodating portion 21C of the cavity 21 and accommodated in the rubber plug accommodating portion 21C, and the space between the cavity 21 and the covered electric wire 50 is between. It is kept in a sealed state. Moreover, the skin peeling part 55 is distribute | arranged to the position of the liquid storage part 25 from the rear-end part of 21 C of rubber plug accommodating parts.

  After all the terminal fittings 40 are inserted into the cavities 21, the sealing material 80 is injected into the liquid reservoir 25 with the connector housing 20 facing down on the side where the terminal fittings 40 are inserted. Then, the sealing material 80 is poured from the liquid reservoir 25 into the rear end portion of the rubber stopper accommodating portion 21 </ b> C of each cavity 21. Thereafter, the sealing material 80 is filled into each rubber stopper housing portion 21 </ b> C and the liquid reservoir 25. The presence of the step 27 </ b> A is a measure for filling the sealing material 80. Thus, when the sealing material 80 is filled in the rubber stopper housing portion 21 </ b> C and the liquid reservoir portion 25, the sealing material 80 adheres and covers both ends of the core wire 51 and the insulating coating 53 exposed in the skin peeling portion 55. It will be. Since the sealing material 80 has the waterproof rubber plug 70, the sealing material 80 does not flow below the waterproof rubber plug 70. After the liquid reservoir 25 is filled with the sealing material 80, heating is performed to cure the sealing material 80.

  A rubber stopper 75 is accommodated in the collective accommodating portion 27 behind the cured sealing material 80. When the rubber plug 75 is pushed down to the step 27 </ b> A of the collective housing portion 27, the gap between the covered electric wire 50 and the collective housing portion 27 is sealed by the rubber plug 75. Further, since the covered electric wire 50 is held at a predetermined position in the collective housing portion 27 by the rubber plug 75, even if a force that touches the covered electric wire 50 acts, 80, the covered electric wire 50 does not move, and the interface between the outer peripheral surface of the covered electric wire 50 and the sealing material 80 does not peel off.

  As described above, the peeled portion 55 obtained by peeling off the insulating coating 53 of the covered electric wire 50 is provided, and the peeled portion 55 is covered with the sealing material 80, so that the core wire 51 of the covered electric wire 50 and the insulating coating 53 are covered. Even if there is a minute gap between them, the continuity along the extending direction of the covered electric wire 50 in the gap is broken by the sealing material 80. Therefore, even if water or oil penetrates through the gap between the core wire 51 and the insulation coating 53, the entry of water is blocked at the portion of the sealing material 80 that covers the skinned portion 55, and the terminal fitting 40 side. Corrosion of the contact portion can be suppressed.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings, and includes, for example, the following various aspects.
(1) Although the rubber plug 75 is used in the above embodiment, the rubber plug 75 may not be used. The rubber plug 75 allows a plurality of covered electric wires 50 to be inserted. However, the rubber plug may allow a single covered electric wire 50 to be inserted, and the rubber plugs may be accommodated in the respective cavities.

(2) In the above embodiment, the rubber plug 75 is provided with the housing-side lip portion 75A and the wire-side lip portion 77A so as to be waterproof. However, even if the lip portion is not formed, the rubber plug 75 is not waterproof. good.

(3) In the above embodiment, the waterproof rubber plug 70 is provided with two lips. However, the number of the lips may be other numbers, and the lip may be omitted as long as the waterproof property is maintained. good.

(4) In the above embodiment, the liquid reservoir 25 is formed in the connector housing 20 in a lump by connecting the cavities 21, but may be formed individually in the rear part of the cavities 21. In that case, there may be no step between the liquid reservoir 25 and each cavity 21.

(5) In the above-described embodiment, the sealing material 80 is a liquid resin that is cured by heat. However, the sealing material 80 may be a mixture of two liquids that is cured, or may be cured by another method.

(6) In the above embodiment, the terminal fitting 40 is female, but may be a male terminal fitting.

(7) In the above embodiment, the waterproof connector 10 is used by being attached to a device, but may be a relay connector or another connector.

(7) In the above embodiment, the entire liquid reservoir 25 is filled with the sealing material 80, and the exposed core wire 51 of the peeled portion 55 and both ends of the insulating coating 53 are covered with the sealing material 80. The end portion of the insulating coating 53 on one side (more preferably the rear side) of the skinned portion 55 may be sealed with a sealing material 80 between the end surface portion of the insulating coating 53 and the core wire 51.

DESCRIPTION OF SYMBOLS 10 ... Waterproof connector 20 ... Connector housing 21 ... Cavity 21B ... Terminal accommodating part 21C ... Rubber plug accommodating part (accommodating part of waterproof rubber stopper)
25 ... Liquid reservoir 27 ... Batch housing part 40 ... Terminal metal fitting 50 ... Coated wire 51 ... Core wire 53 ... Insulation coating 55 ... Peeling part 70 ... Waterproof rubber plug 71 ... Small diameter part 73 ... Large diameter part 75 ... Rubber plug (holding) Element)
75A ... Housing side lip portion 77 ... Electric wire insertion hole 77A ... Electric wire side lip portion 80 ... Sealing material

Claims (5)

A terminal fitting connected to the end of a covered electric wire whose core wire is covered with an insulation coating;
A connector housing having a cavity for accommodating the terminal fitting;
A waterproof rubber stopper that maintains a watertight state between the outer peripheral surface of the covered electric wire and the inner peripheral surface of the cavity;
The covered electric wire is provided with a peeled portion where a part of the insulating coating is peeled off on the side opposite to the terminal fitting with respect to the waterproof rubber plug, and the peeled portion is connected to the insulating coated end portion. The waterproof connector covered with the sealing material which seals between the said core wires.   In the connector housing, a liquid reservoir is formed continuously with the housing portion of the waterproof rubber plug, and the skinned portion of the covered electric wire is placed in the liquid reservoir with the waterproof rubber plug being housed in the housing portion. 2. The waterproof connector according to claim 1, wherein the waterproof connector is provided so as to be positioned, and covers the skinned portion by pouring the sealing material into the liquid reservoir portion with the waterproof rubber stopper facing down.   The waterproof connector according to claim 1, wherein the connector housing is provided with a holding member that holds the covered electric wire at a position opposite to the terminal fitting with respect to the sealing material.   The holding member is a rubber plug having an electric wire insertion hole through which the covered electric wire is inserted, and a housing-side lip portion that is in close contact with the housing portion of the connector housing is formed on an outer peripheral surface of the rubber plug, and the rubber plug The waterproof connector according to claim 3, wherein an electric wire side lip portion that is in close contact with the outer peripheral surface of the covered electric wire is formed on an inner peripheral surface of the electric wire insertion hole.   A plurality of the cavities are formed in the connector housing, and terminal fittings to which the covered electric wires are connected are individually accommodated in the cavities, and a plurality of the waterproof rubber plugs are provided individually for the covered electric wires, The waterproof connector according to claim 4, wherein the rubber plug is formed with a plurality of wire insertion holes through which the plurality of covered wires are individually inserted.

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