JPH09199218A - Waterproof connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof connector, which constitutes a wire coating layer by two layers, which can prevent leading to a connection terminal from between these two layers of water even when its infiltration is generated by damaging the layer in an outer side. SOLUTION: This connector has a connection terminal connecting a wire, housing inserting the connection terminal and a cylindrical waterproofing seal 11 inserting the connection terminal connecting the wire to water-tightly seal between the housing and the wire connected to the connection terminal. Here, the waterproofing seal 11, having a circular annular stepped surface 13 in an internal peripheral surface, comprises a relatively internal diametric large/small part, circular annular irregularity parts 14a, 14b are provided in the internal peripheral surface in both sides of the stepped surface 13, the connected wire is inserted to the waterproofing seal 11 from an internal diametric large part toward small part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof connector used for connecting electric wires, and more particularly to a waterproof connector used for connecting insulated electric wires having a coating layer consisting of two layers, an insulating layer and a sheath.

[0002]

2. Description of the Related Art A conventional waterproof connector has, for example, a structure shown in FIG. This waterproof connector 1 has a connection terminal 2
And a housing into which the connection terminal 2 is inserted (not shown)
And a waterproof seal 4 for water-tightly sealing between the housing and the electric wire 3 connected to the connection terminal 2. 5
Is a fitting portion of the connection terminal 2, and 6 is a crimping portion for connecting the electric wire 3. . The waterproof seal 4 is made of rubber, and as shown in FIG.
It has a cylindrical shape, and a plurality of ring-shaped uneven portions 4a for sealing the electric wire 3 connected to the connection terminal 2 and inserted therein with good water-tightness are provided on the inner side at intervals in the axial direction. A plurality of ring-shaped concave-convex portions 4b are provided on the outer side at intervals in the axial direction in order to seal the housing and the water-tightness well.

The electric wire 3 is connected by the waterproof connector 1 as follows. That is, the coating layer 3a at the end of the electric wire 3 is peeled off with an appropriate length to expose the conductor 3b, and the electric wire 3 is inserted into the waterproof seal 4. Then, the conductor 3b is crimp-connected to the connection terminal 2 at the crimp portion 6. In this state, the fitting portion 5 of the connection terminal 2 is provided with a housing (not shown).
Insert and fix. A pair of such housings, female
The housings are connected to each other so as to form a male, and the fitting portions 5 and 5 forming the female and male of the housings are fitted to each other to connect the electric wires 3 and 3 in a watertight manner.

[0004]

However, the above-mentioned waterproof connector has the following problems. That is,
As shown in FIG. 5, when the covering layer 3a of the electric wire to be connected is composed of two layers of the insulating layer 3a ₁ and the sheath 3a ₂ , the covering layer 3a composed of these two layers is collectively peeled off, The electric wire 3 is connected to the connection terminal 2, and the waterproof seal 4 is covered.
In this case, if the outer sheath 3a ₂ responsible for mechanical strength is damaged, water may enter between the insulating layer 3a ₁ and the sheath 3a ₂ to reach the connection terminal, and may contaminate or corrode the connection terminal. It was

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a connection terminal to which an electric wire is connected, a housing into which the connection terminal is inserted, and the connection to which the electric wire is connected are provided. In a waterproof connector having a cylindrical waterproof seal that inserts a terminal and seals between a housing and an electric wire connected to a connection terminal in a watertight manner, the waterproof seal has an annular step surface on an inner peripheral surface. Then, it is composed of a portion having a relatively large inner diameter and a portion having a relatively small inner diameter. It is characterized in that it is inserted toward the waterproof seal.

[0006] When connecting an electric wire whose cover layer is composed of two layers, an inner insulating layer and an outer sheath, by using the waterproof connector having the waterproof seal as described above, the height of the step surface is set to the sheath surface. If the thickness is made equal, the coating layer is divided into a sheath and an insulating layer, and the layer is peeled off to expose the end of the insulating layer to the surface, and the insulating layer is sealed with a ring-shaped concavo-convex portion with a small inner diameter of the waterproof seal. The sheath can be sealed by the annular irregular portion of the waterproof seal having a large inner diameter. Therefore, even if the outer sheath is damaged and water invades between the insulating layer and the sheath, the water is sealed between the insulating layer and the sheath because the surface of the insulating layer is sealed by the portion with the small inner diameter of the waterproof seal. It is possible to prevent the connection terminal from reaching the connection terminal.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment of a waterproof seal 11 that constitutes a waterproof connector according to the present invention. Further, FIG. 2 is an explanatory diagram showing a state in which the waterproof seal 11 is covered and sealed on the electric wire 3. The waterproof seal 11 is made of rubber and has a cylindrical shape, and an annular uneven portion 12 for sealing the housing with good watertightness is formed on the outer peripheral surface thereof. Further, an annular step surface 13 is provided on the inner peripheral surface of the waterproof seal 11, and the inner diameter d on one side of the step surface 13 and the end portion side of the inserted electric wire 3
₁ is smaller than the inner diameter d ₂ on the opposite side.
Further, on the inner peripheral surfaces on both sides of the stepped surface 13 of the waterproof seal 11, annular concavo-convex portions 14a and 14b for sealing the electric wire 3 with good watertightness are formed.

The electric wire 3 to be connected is covered with a covering layer 3a consisting of two layers of an insulating layer 3a ₁ and a sheath 3a ₂ , and its connecting end portion is stripped in two steps of the insulating layer 3a ₁ and the sheath 3a _2. The conductor 3b is exposed. The waterproof seal 11 used for connecting the electric wire 3 is provided with a step surface 13 whose height is equal to the thickness of the sheath 3a ₂ . To attach the waterproof seal 11 to the electric wire 3, attach the waterproof seal 11 to the connecting end of the electric wire 3.
The inner surface of the insulating layer 3a ₁ forming the inner side of the coating layer 3a is made smaller by inserting the cross section of the stepped stripped sheath 3a ₂ into contact with the step surface 13 by inserting from the end with the larger inner diameter (left side in FIG. 2). Watertight sealing is performed with the uneven portion 14a provided on the inner peripheral surface of the other inner diameter, and the surface of the sheath 3a ₂ constituting the outer side of the coating layer 3a is sealed with the uneven portion 14b provided on the inner peripheral surface of the larger inner diameter. .

As described above, the waterproof seal 11 is attached to the electric wire 3.
When you put it on, the electric wire 3
From the connection end side (right side in FIG. 2) of the uneven portion 12
Is watertight between the housing (not shown) and the waterproof seal 11.
Can be sealed on. Also, the sheath 3a_TwoDamage to
Water is generated and the water is infiltrated, and the water enters the sheath 3a._TwoAnd insulating layer 3a ₁
Even if it penetrates between the layers, the water is blocked by the uneven portion 14a.
This water does not reach the connecting terminals.

[0010]

As described above, according to the present invention, a connection terminal to which an electric wire is connected, a housing into which the connection terminal is inserted, and the connection terminal to which the electric wire is connected are inserted to form a housing. In a waterproof connector having a cylindrical waterproof seal that seals between the electric wire connected to the connection terminal in a watertight manner, the waterproof seal has an annular step surface on the inner peripheral surface, and has a relative inner diameter. It is composed of a large part and a small part, and annular uneven parts are provided on the inner peripheral surfaces on both sides of the stepped surface, and the electric wire to be connected is inserted into the waterproof seal from the part with the large inner diameter to the part with the small inner diameter. Therefore, even if the outer layer is damaged and water is flooded because the coating layer of the wire is composed of two layers, it is possible to prevent water from reaching the connection terminals from between these two layers. There is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a waterproof seal that constitutes a waterproof connector according to the present invention.

FIG. 2 is a cross-sectional view showing a state where the waterproof seal is attached to an electric wire.

FIG. 3 is a side view showing a state in which a conventional waterproof connector is connected to an electric wire.

FIG. 4 is a sectional view of a waterproof seal used in the conventional waterproof connector.

FIG. 5 is an explanatory view of problems of the conventional waterproof connector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Waterproof connector 2 Connection terminal 3 Electric wire 3a Covering layer 3a ₁ Insulating layer 3a ₂ Sheath 3b Conductor 4 Waterproof seal 4a, 4b Uneven part 5 Fitting part 6 Crimping part 11 Waterproof seal 12, 14a, 14b Uneven part 13 Step surface

Claims (1)

[Claims] 1. A connection terminal to which an electric wire is connected, a housing into which the connection terminal is inserted, and the connection terminal to which the electric wire is connected are inserted between the housing and the electric wire connected to the connection terminal. In a waterproof connector having a watertight cylindrical waterproof seal, the waterproof seal has an annular step surface on an inner peripheral surface, and has a relatively large inner diameter portion and a relatively small inner diameter portion. A waterproof connector, wherein annular concave and convex portions are provided on inner peripheral surfaces on both sides of the surface, and an electric wire to be connected is inserted into the waterproof seal from a portion having a large inner diameter to a portion having a small inner diameter.