JPH10321288A - Sealing member for water-proof connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing member easy to move relatively to an inserted electric wire and to provide sufficiently high water-proofing function. SOLUTION: A sealing member 13 having parts 27, 29 with corrugated crosssection shapes is installed in the outer and inner circumferential faces of a skeleton member 12 which is produced by joining a front side ring part 21 and a rear side ring part 22 through a plurality of bridging parts 23 having flexibility. The bridging parts 23 comprise approximately middle step parts 23a in the front and rear parts, front bridging part 23b in front of the step parts 23a, and rear bridging part 23c behind the step parts 23a and the inner diameter of the front bridging part 23b is made smaller than that of the rear bridging part 23c. The inner diameter of the front ring part 21 is made smaller than that of the front bridging part 23b and the inner diameter of the rear ring part 22 is made the same as that of the rear bridging part 23c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof connector seal member for waterproofing a rear portion of a connection terminal housed in a connector housing, for example.

[0002]

2. Description of the Related Art As shown in FIG. 8, for example, in a conventional sealing member 1 of this type, a sealing material 3 such as rubber is wrapped around the inner and outer peripheral surfaces of a cylindrical core member 2. Are electric wire insertion holes 4. The core member 2 includes a front cylindrical portion 2a,
It has a substantially middle flange part 2b at the front and rear, and a rear cylinder part 2c, and the rear cylinder part 2c is provided with a plurality of vertical gaps 2d to provide flexibility. Also,
A straight portion 4a having an inner diameter slightly larger than the outer diameter of the electric wire is formed in the seal member 3 at the front portion of the electric wire insertion hole 4, and a corrugated portion 4b having an inner diameter smaller than the outer diameter of the electric wire is formed at the rear portion. .

As shown in FIG. 9, when the electric wire 5 is inserted into the electric wire insertion hole 4 of the seal member 1, the electric wire 5 is
Proceeds to the straight portion 4a while expanding the diameter, and exits forward. At this time, since the rear cylindrical portion 2c of the core member 2 has flexibility, it is bent outward to allow the electric wire 5 to easily pass therethrough. When crimping the covering crimping piece 6 of the connection terminal to the seal member 1 into which the electric wire 5 has been inserted, after moving the seal member 1 to a predetermined position with respect to the electric wire 5, the connection terminal is connected to the front part of the seal member 1. The coated crimping piece 6 is crimped.

[0004]

However, since the flexibility of the front cylindrical portion 2a is low, even if the sealing member 1 is tightened by the covering crimping piece 6 of the connection terminal, the electric wire 5 cannot be tightened, and the sealing is not performed. There is a possibility that the member 1 may move unintentionally with respect to the electric wire 5.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a waterproof connector seal member that can be securely fixed to an electric wire and has a sufficient waterproof function.

[0006]

In order to achieve the above object, a seal member for a waterproof connector according to the present invention comprises a front ring portion and a rear ring portion via a plurality of flexible bridging portions. And a seal member having a corrugated section is circumferentially attached to the inner and outer peripheral surfaces of the skeletal member connecting the two members.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. 1 is a perspective view of the embodiment, FIG. 2 is a schematic rear view, and FIG. 3 is a cross-sectional view of FIG. 2 taken along the line AA. A sealing material 13 such as rubber is attached to the peripheral surface. The sealing member 11 has a front surface 14 and a rear surface 15.
There is provided an electric wire insertion hole 16 that penetrates through the gap and inserts an electric wire described later.

[0008] As shown in the perspective view of FIG.
Is formed of a synthetic resin material, and its cross-sectional shape is a perfect circle. The skeleton member 12 is provided with a front ring portion 21 located on the front surface 14 side, a rear ring portion 22 located on the rear surface 15 side, and a bridging portion 23 connecting these ring portions 21, 22. While the skeletal member 12 has rigidity in the vertical direction, a plurality of, for example, eight, vertical gaps 24 are formed in the bridging portion 23 to provide radial flexibility. A step portion 23a is formed substantially in the middle before and after the bridging portion 23, and the front side 14 side of the step portion 23a is a front bridging portion 23b.
The rear surface 15 side is a rear bridge portion 23c having an inner diameter larger than the inner diameter of the front bridge portion 23b. The inside diameter of the front ring portion 21 is smaller than the inside diameter of the front bridge portion 23b, and the inside diameter of the rear ring portion 22 substantially matches the inside diameter of the rear bridge portion 23c.

The front surface 14 side of the inner peripheral surface of the seal member 11
A straight portion 25 having an inner diameter slightly larger than the outer diameter of the electric wire is provided. A tapered portion 26 for guiding the electric wire is provided on the rear surface 15 side, and a waveform having an inner diameter capable of pressing against the outer surface of the electric wire between the straight portion 25 and the tapered portion 26. The part 27 is provided. The front surface 14 side of the outer peripheral surface of the sealing material 13 is a crimping portion 28 which is fastened by a covering crimping piece of a connection terminal described later, and the rear surface 15 side is a corrugated portion 29 pressed into a terminal housing hole of a connector housing described later. It has been. And the waveform part 2
For example, four jig receiving grooves 30 are provided on the rear surface 15 side of 9.

As shown in FIG. 5, when the electric wire 31 is inserted into the electric wire insertion hole 16 from the rear surface 15 side of the seal member 11, the core wire 31a and the coating 31b of the electric wire 31 are guided by the tapered portion 26 of the seal member 11. Easily enter the corrugated part 27,
It passes through the straight part 25 to the front surface 14 side. At this time, since the bridging portion 23 of the skeleton member 12 has flexibility in the radial direction, the electric wire 31 presses the corrugated portion 27 to bend the bridging portion 23 outward, and the electric wire insertion hole 16 is easily formed. Advance.

Next, as shown in FIG. 6, after the electric wire 31 moves forward to a predetermined position and the sealing member 11 moves to a predetermined position with respect to the electric wire 31, the core crimping piece 32a of the connection terminal 32 is used. The cover 31b of the electric wire 31 is crimped by the crimping piece 32b of the connection terminal 32. As a result, the front bridge portion 23b of the skeleton member 12 is tightened by the covering crimping piece 32b, and the front bridge portion 23b is tightened.
b is bent inward with the front ring portion 21 as a fulcrum, and the straight portion 25 of the wire insertion hole 16 is brought into close contact with the outer peripheral surface of the wire 31.

When the connection terminal 32 is pushed into the terminal receiving hole 33a of the connector housing 33 as shown in FIG. 7, the corrugated portion 29 on the outer peripheral surface of the seal member 11 is pressed by the peripheral wall of the terminal receiving hole 33a, and is formed linearly. And closely adheres to the peripheral wall of the terminal receiving hole 33a. At the same time, the corrugated portion 27 on the inner peripheral surface of the sealing material 11 is brought into close contact with the outer peripheral surface of the electric wire 31.

As described above, in the embodiment, the front ring portion 21 and the rear ring portion 22 are connected via the plurality of flexible bridging portions 23.
The bridge portion 23 is easily bent outward when the wire 31 is inserted, and the wire 31 can be easily moved even in a large number. At this time, since the skeleton member 12 has rigidity in the vertical direction, the connection terminal 32 is pushed into a predetermined position of the connector housing 33 by using the rear ring portion 22 of the skeleton member 12, or a locking member (not shown) is The connection terminal 32 can be prevented from slipping back by being applied to the rear ring portion 32 from outside the connector housing 33.

Further, since the step portion 23a and the front bridge portion 23b of the skeleton member 23 have flexibility, when the crimping portion 28 is tightened by the covering crimping piece 32b of the connection terminal 32, the step portion 23a and the front portion 23a The bridging portion 23b is easily bent, and the straight portion 25 of the sealing material 13 is securely brought into close contact with the outer peripheral surface of the electric wire 31, and cooperates with the rear bridging portion 23c to improve waterproofness of the outer peripheral surface of the electric wire 31. Further, since the flexibility of the bridging portion 23 of the skeleton member 12 is improved as compared with the related art, when the electric wire 31 is inserted into the electric wire insertion hole 16, the core wire 31 a of the electric wire 31 is formed.
It is possible to prevent loosening. Further, by making the cross-sectional outer shape of the seal member 11 a perfect circle, it is not necessary to control the angle of the seal member 11 with respect to the connection terminal 32, and the workability during assembly can be improved.

In this embodiment, the bridging portion 23 is divided into a front bridging portion 23b and a rear bridging portion 23c at the boundary of the step portion 23a. You may make it the bridge part 23c communicate smoothly.

[0016]

As described above, the sealing member for a waterproof connector according to the present invention has a front ring portion and a rear ring portion connected via a plurality of flexible bridging portions. The bridge portion of the skeletal member is swelled inward and outward with respect to the inserted electric wire, so that reliable fixing and waterproofing can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a schematic rear view.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a perspective view of a skeleton member.

FIG. 5 is a cross-sectional view showing a state where an electric wire is inserted.

FIG. 6 is a cross-sectional view of a state where the connection terminals are crimped.

FIG. 7 is a cross-sectional view of a state housed in a connector housing.

FIG. 8 is a sectional view of a conventional example.

FIG. 9 is a cross-sectional view of a conventional example when used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Seal member 12 Frame member 13 Seal material 16 Electric wire insertion hole 21 Front ring part 22 Rear ring part 23 Bridge part 23a Step part 23b Front bridge part 23c Rear bridge part 27, 29 Corrugated part

Claims (4)

[Claims] 1. A seal member having a corrugated cross section is provided on the inner and outer peripheral surfaces of a skeleton member connecting a front ring portion and a rear ring portion via a plurality of flexible bridging portions. A sealing member for a waterproof connector, wherein the sealing member is circumferentially wound. 2. The bridging portion has a front bridging portion and a rear bridging portion via a substantially intermediate step, and an inner diameter of the front bridging portion is smaller than an inner diameter of the rear bridging portion. The sealing member for a waterproof connector according to claim 1. 3. The seal member for a waterproof connector according to claim 1, wherein an inner diameter of the front ring portion is smaller than an inner diameter of the bridge portion. 4. The seal member for a waterproof connector according to claim 1, wherein an inner diameter of the rear ring portion is made equal to an inner diameter of the bridge portion.