CN113629436A

CN113629436A - Connector with a locking member

Info

Publication number: CN113629436A
Application number: CN202010377684.2A
Authority: CN
Inventors: 姚李强; 王勇; 李国强; 王迎春; 张道宽
Original assignee: Tyco Electronics Shanghai Co Ltd
Current assignee: Tyco Electronics Shanghai Co Ltd
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2021-11-09

Abstract

The invention discloses a connector, comprising: an insulating body formed with at least one terminal insertion hole; at least one conductive terminal, insert in at least one terminal jack separately; and at least one elastic sealing element respectively sleeved on at least one conductive terminal. Each elastic sealing element comprises an outer ring part and an inner ring part, the inner ring part is sleeved on the conductive terminal, and the conductive terminal expands the inner ring part outwards along the radial direction of the conductive terminal so as to enable the conductive terminal and the conductive terminal to be in close contact; an annular positioning projection is formed on the inner wall of each terminal insertion hole, and the connector further comprises a pushing member which pushes the outer ring part against the annular positioning projection in the axial direction of the conductive terminal so that the outer ring part is in close contact with the annular positioning projection. In the invention, the sealing interface of the inner ring part and the outer ring part of the elastic sealing element is not affected when the conductive terminal moves, thereby improving the sealing performance. Moreover, the inner ring part and the outer ring part respectively realize radial sealing and axial sealing, and the correlation degree between the two parts is small.

Description

Connector with a locking member

Technical Field

The present invention relates to a connector.

Background

In the prior art, a common elastic sealing ring is generally used to seal between a terminal insertion hole of a connector and a conductive terminal. The elastic sealing ring is squeezed between the inner wall of the terminal insertion hole and the conductive terminal along the radial direction. However, such an elastic seal ring has a poor sealing effect. In addition, in order to realize radial extrusion, the outer diameter of the elastic sealing ring is larger than the diameter of the terminal jack, so that the elastic sealing ring sleeved on the conductive terminal is difficult to insert into the terminal jack and can generate serious friction with the inner wall of the terminal jack, and if the conductive terminal needs to be repeatedly inserted and pulled, the elastic sealing ring is damaged, and sealing failure is caused.

Disclosure of Invention

An object of the present invention is to solve at least one of the above problems and disadvantages in the prior art.

According to an aspect of the present invention, there is provided a connector including: an insulating body formed with at least one terminal insertion hole; at least one conductive terminal, insert in the said at least one terminal jack separately; and at least one elastic sealing element respectively sleeved on the at least one conductive terminal. Each elastic sealing element comprises an outer ring part and an inner ring part, the inner ring part is sleeved on the conductive terminal, and the conductive terminal expands the inner ring part outwards along the radial direction of the conductive terminal so as to enable the conductive terminal and the conductive terminal to be in close contact; an annular positioning protrusion is formed on an inner wall of each of the terminal insertion holes, and the connector further includes a pushing member that pushes the outer ring portion against the annular positioning protrusion in an axial direction of the conductive terminal so that the outer ring portion is in close contact with the annular positioning protrusion.

According to an exemplary embodiment of the invention, a recessed annular transition portion is defined between the outer ring portion and the inner ring portion such that the cross-section of the elastomeric seal is substantially "8" shaped.

According to another exemplary embodiment of the present invention, an outer ring receiving groove is formed on an end surface of the annular positioning projection, and an outer ring portion of the elastic seal is positioned in the outer ring receiving groove.

According to another exemplary embodiment of the present invention, a raised annular transition portion is formed between the outer ring receiving groove and the terminal insertion hole, the raised annular transition portion being adapted to be positioned in the recessed annular transition portion.

According to another exemplary embodiment of the present invention, an inner ring receiving groove is formed on an outer circumferential surface of the conductive terminal, and the inner ring portion of the elastic seal member is positioned in the inner ring receiving groove; and the diameter of the conductive terminal at the inner ring accommodating groove is larger than that of the central through hole of the inner ring part so as to expand the inner ring part outwards along the radial direction.

According to another exemplary embodiment of the present invention, the urging member has at least one cylindrical insertion portion adapted to be inserted into the at least one terminal insertion hole from a rear side of the insulating body, respectively, the cylindrical insertion portion being adapted to urge the outer ring portion of the elastic seal forward in the axial direction.

According to another exemplary embodiment of the invention, the connector further comprises a fixing seat, which is latched to the rear side of the insulating body and adapted to fix the pushing member on the insulating body.

According to another exemplary embodiment of the present invention, the fixing holder includes at least one resilient locking arm adapted to be inserted into the at least one terminal insertion hole, respectively, an end portion of the resilient locking arm being adapted to abut against a positioning step surface on the conductive terminal to hold the conductive terminal in the terminal insertion hole.

According to another exemplary embodiment of the invention, the pushing element further comprises a plate-shaped base located at the rear side of the insulating body, the at least one cylindrical insertion portion extending forward from the plate-shaped base, the plate-shaped base being adapted to be fixed on the rear side of the insulating body by the fixing seat.

According to another exemplary embodiment of the present invention, the holder includes an end plate portion for pushing the plate-shaped base portion of the pushing member on the rear side of the insulating body so that the plate-shaped base portion is fixed on the rear side of the insulating body.

According to another exemplary embodiment of the present invention, the fixing base further includes a plurality of elastic snaps connected to edges of the end plate portions, a plurality of protrusions are formed on the insulation body, and the plurality of elastic snaps are adapted to respectively latch on the plurality of protrusions so as to fix the fixing base to the insulation body.

According to another exemplary embodiment of the present invention, each of the conductive terminals includes a first end adapted to be connected to a wire, a second end adapted to mate with a terminal of a mating connector, and a raised annular locating seat located between the first end and the second end.

According to another exemplary embodiment of the present invention, the inner ring receiving groove is formed on an outer circumferential surface of the annular positioning seat, and a rear end surface of the annular positioning seat serves as the positioning step surface of the conductive terminal.

According to another exemplary embodiment of the present invention, the first end of the conductive terminal is cylindrical, and the second end of the conductive terminal is cylindrical; the cylindrical first end portion of the conductive terminal is adapted to be crimped onto an end portion of the conductive wire.

According to another exemplary embodiment of the present invention, the annular positioning projection divides the terminal insertion hole into a front portion and a rear portion, the first end portion of the conductive terminal and the annular positioning seat are received in the rear portion of the terminal insertion hole, and the second end portion of the conductive terminal passes through the through hole of the annular positioning projection and is received in the front portion of the terminal insertion hole.

According to another exemplary embodiment of the present invention, a plurality of terminal insertion holes are formed in the insulating body, the connector includes a plurality of conductive terminals and a plurality of elastic sealing members, the conductive terminals are respectively inserted into the terminal insertion holes, and the elastic sealing members are respectively sleeved on the conductive terminals.

According to another exemplary embodiment of the present invention, a flange-like connection flange is formed on the insulation body, and the connector may be connected to the mounting panel through the flange-like connection flange.

According to another exemplary embodiment of the present invention, an outer diameter of the elastic sealing member is smaller than a diameter of the terminal insertion hole so as not to contact an inner wall surface of the terminal insertion hole in a process of inserting the elastic sealing member fitted over the conductive terminal into the terminal insertion hole.

In each of the foregoing exemplary embodiments of the present invention, the sealing interface of the inner ring portion and the outer ring portion of the elastomeric seal is not affected when the conductive terminal moves, improving sealing performance. Moreover, the inner ring part and the outer ring part respectively realize radial sealing and axial sealing, the degree of association between the inner ring part and the outer ring part is small, and the sealing effect is further improved.

Further, in the foregoing respective exemplary embodiments of the present invention, the outer ring portion of the elastic seal member is pressed in the axial direction against the annular positioning projection in the terminal insertion hole without being pressed against the inner wall of the terminal insertion hole, so that the elastic seal member can be prevented from being worn by the inner wall surface of the terminal insertion hole, and the sealing effect is improved.

Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.

Drawings

Fig. 1 shows a perspective view of a connector according to an exemplary embodiment of the present invention, viewed from the front side;

fig. 2 shows a perspective view of a connector according to an exemplary embodiment of the present invention, viewed from the rear side;

FIG. 3 shows a longitudinal cross-sectional view of the connector shown in FIG. 2;

FIG. 4 shows a perspective view of the elastomeric seal of the connector shown in FIG. 3;

FIG. 5 shows a transverse cross-sectional view of the elastomeric seal shown in FIG. 4;

fig. 6 shows a longitudinal cross-sectional view of the connector of fig. 2 with the conductive terminals removed;

fig. 7 is a perspective view of the conductive terminal of the connector shown in fig. 2;

FIG. 8 shows a partially enlarged schematic view of the connector shown in FIG. 2;

fig. 9 shows a longitudinal cross-sectional view of the connector of fig. 2 showing the wires connected to the conductive terminals.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.

Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.

According to one general technical concept of the present invention, there is provided a connector including: an insulating body formed with at least one terminal insertion hole; at least one conductive terminal, insert in the said at least one terminal jack separately; and at least one elastic sealing element respectively sleeved on the at least one conductive terminal. Each elastic sealing element comprises an outer ring part and an inner ring part, the inner ring part is sleeved on the conductive terminal, and the conductive terminal expands the inner ring part outwards along the radial direction of the conductive terminal so as to enable the conductive terminal and the conductive terminal to be in close contact; an annular positioning protrusion is formed on an inner wall of each of the terminal insertion holes, and the connector further includes a pushing member that pushes the outer ring portion against the annular positioning protrusion in an axial direction of the conductive terminal so that the outer ring portion is in close contact with the annular positioning protrusion.

Fig. 1 shows a perspective view of a connector according to an exemplary embodiment of the present invention, viewed from the front side; fig. 2 shows a perspective view of a connector according to an exemplary embodiment of the present invention, viewed from the rear side; fig. 3 shows a longitudinal sectional view of the connector shown in fig. 2.

As shown in fig. 1 to 3, in the illustrated embodiment, the connector mainly includes: the insulating body 100, at least one conductive terminal 500 and at least one elastic sealing member 400. The insulative body 100 is formed with at least one terminal insertion hole 101. At least one conductive terminal 500 is inserted into at least one terminal insertion hole 101, respectively. At least one elastic sealing member 400 is respectively fitted over at least one conductive terminal 500.

FIG. 4 shows a perspective view of the elastomeric seal 400 of the connector shown in FIG. 3; fig. 5 shows a transverse cross-sectional view of the elastomeric seal 400 shown in fig. 4.

As shown in fig. 1 to 5, in the illustrated embodiment, each of the elastic sealing members 400 includes an outer ring portion 410 and an inner ring portion 420, the inner ring portion 420 is fitted over a conductive terminal 500, and the conductive terminal 500 expands the inner ring portion 420 outward in a radial direction thereof to make close contact therewith.

As shown in fig. 1 to 5, in the illustrated embodiment, an annular positioning projection 130 is formed on the inner wall of each terminal insertion hole 101, and the connector further includes a pushing member 300, the pushing member 300 pushing the outer ring portion 410 against the annular positioning projection 130 in the axial direction of the conductive terminal 500 to bring the outer ring portion 410 into close contact with the annular positioning projection 130.

As shown in fig. 1-5, in the illustrated embodiment, a recessed annular transition portion 430 is defined between outer ring portion 410 and inner ring portion 420 such that elastomeric seal 400 is generally "8" shaped in cross-section.

Fig. 6 shows a longitudinal cross-sectional view of the connector shown in fig. 2 with the conductive terminal 500 removed.

As shown in fig. 1 to 6, in the illustrated embodiment, an outer ring receiving groove 131 is formed on an end surface of the annular positioning projection 130, and an outer ring portion 410 of the elastic seal 400 is positioned in the outer ring receiving groove 131.

Fig. 8 shows a partially enlarged view of the connector shown in fig. 2.

As shown in fig. 1-6 and 8, in the illustrated embodiment, a raised annular transition portion 132 is formed between the outer ring receiving groove 131 and the terminal insertion hole 101, the raised annular transition portion 132 being adapted to be positioned in a recessed annular transition portion 430.

Fig. 7 is a perspective view of the conductive terminal 500 of the connector shown in fig. 2.

As shown in fig. 1 to 8, in the illustrated embodiment, an inner ring receiving groove 531 is formed on an outer circumferential surface of the conductive terminal 500, and the inner ring portion 420 of the elastic seal 400 is positioned in the inner ring receiving groove 531. The conductive terminal 500 has a diameter greater than that of the central through hole 401 of the inner ring portion 420 at the inner ring receiving groove 531 to outwardly expand the inner ring portion 420 in a radial direction.

As shown in fig. 1 to 8, in the illustrated embodiment, the urging member 300 has at least one cylindrical insertion portion 320 adapted to be inserted into at least one terminal insertion hole 101, respectively, from the rear side of the insulating body 100, the cylindrical insertion portion 320 being adapted to urge the outer ring portion 410 of the elastic seal member 400 forward in the axial direction.

As shown in fig. 1 to 8, in the illustrated embodiment, the connector further includes a fixing base 200, the fixing base 200 is latched to the rear side of the insulation body 100 and is adapted to fix the pushing member 300 on the insulation body 100.

As shown in fig. 1 to 8, in the illustrated embodiment, the fixing base 200 includes at least one elastic locking arm 230 adapted to be inserted into at least one terminal insertion hole 101, respectively, and an end portion of the elastic locking arm 230 is adapted to abut against a positioning step surface 532 on the conductive terminal 500 to hold the conductive terminal 500 in the terminal insertion hole 101.

As shown in fig. 1 to 8, in the illustrated embodiment, the pushing member 300 further includes a plate-shaped base portion 310 located at the rear side of the insulating body 100, at least one cylindrical insertion portion 320 extending forward from the plate-shaped base portion 310, the plate-shaped base portion 310 being adapted to be fixed on the rear side of the insulating body 100 by the fixing base 200.

As shown in fig. 1 to 8, in the illustrated embodiment, the fixing base 200 includes an end plate portion 210, and the end plate portion 210 is used to press the plate-shaped base portion 310 of the pressing member 300 on the rear side of the insulating body 100, so that the plate-shaped base portion 310 is fixed on the rear side of the insulating body 100.

As shown in fig. 1 to 8, in the illustrated embodiment, the fixing base 200 further includes a plurality of elastic latches 220 connected to an edge of the end plate portion 210, a plurality of protrusions 120 are formed on the insulation body 100, and the plurality of elastic latches 220 are adapted to latch on the plurality of protrusions 120, respectively, so as to fix the fixing base 200 to the insulation body 100.

Fig. 9 shows a longitudinal cross-sectional view of the connector of fig. 2 showing the wire 10 connected to the conductive terminal 500.

As shown in fig. 1-9, in the illustrated embodiment, each conductive terminal 500 includes a first end 510 adapted for connection with a wire 10, a second end 520 adapted for mating with a terminal of a mating connector, and a raised annular positioning seat 530 located between the first end 510 and the second end 520.

As shown in fig. 1 to 9, in the illustrated embodiment, the inner ring receiving groove 531 is formed on the outer peripheral surface of the annular positioning seat 530, and the rear end surface of the annular positioning seat 530 serves as a positioning step surface 532 of the conductive terminal 500.

As shown in fig. 1 to 9, in the illustrated embodiment, the first end portion 510 of the conductive terminal 500 is cylindrical, and the second end portion 520 of the conductive terminal 500 is cylindrical. The cylindrical first end 510 of the conductive terminal 500 is adapted to be crimped onto an end of the wire 10.

As shown in fig. 1 to 9, in the illustrated embodiment, the annular positioning protrusion 130 divides the terminal insertion hole 101 into two front and

rear portions

101a and 101b, the first end portion 510 and the annular positioning seat 530 of the conductive terminal 500 are received in the rear portion 101b of the terminal insertion hole 101, and the second end portion 520 of the conductive terminal 500 is inserted through the through hole of the annular positioning protrusion 130 and received in the front portion 101a of the terminal insertion hole 101.

As shown in fig. 1 to 9, in the illustrated embodiment, a plurality of terminal insertion holes 101 are formed in the insulating body 100, the connector includes a plurality of conductive terminals 500 and a plurality of elastic sealing members 400, the plurality of conductive terminals 500 are respectively inserted into the plurality of terminal insertion holes 101, and the plurality of elastic sealing members 400 are respectively sleeved on the plurality of conductive terminals 500.

As shown in fig. 1 to 9, in the illustrated embodiment, a flange-shaped connection flange 110 is formed on the insulation body 100, and the connector may be connected to the mounting panel through the flange-shaped connection flange 110.

As shown in fig. 1 to 9, in the illustrated embodiment, the outer diameter of the elastic sealing member 400 is smaller than the diameter of the terminal insertion hole 101 so as not to contact the inner wall surface of the terminal insertion hole 101 in the process of inserting the elastic sealing member 400 fitted over the conductive terminal 500 into the terminal insertion hole 101.

In the foregoing exemplary embodiments of the present invention, as shown in fig. 1 to 5, the sealing interface between the inner ring portion 420 and the outer ring portion 410 of the elastic sealing member 400 is not affected when the conductive terminal moves, so that the sealing performance is improved. Moreover, the inner ring part 420 and the outer ring part 410 of the elastic sealing element 400 respectively realize radial sealing and axial sealing, and the association degree between the two parts is small, so that the sealing effect is further improved.

In the foregoing exemplary embodiments of the present invention, as shown in fig. 1 to 5, in the illustrated embodiments, the annular transition portion 430 between the outer ring portion 410 and the inner ring portion 420 of the elastic seal 400 can be elastically deformed, so that the relative displacement between the outer ring portion 410 and the inner ring portion 420 can be absorbed, and therefore, no relative displacement or a small relative displacement between the sealing interface of the outer ring portion 410 and the sealing interface of the inner ring portion 420 can be ensured, and the sealing reliability can be improved.

It will be appreciated by those skilled in the art that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle.

Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of preferred embodiments of the present invention and should not be construed as limiting the invention.

Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the appended claims and their equivalents.

It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude a plurality. Furthermore, any reference signs in the claims shall not be construed as limiting the scope of the invention.

Claims

1. A connector, comprising:

an insulating body (100) formed with at least one terminal insertion hole (101);

at least one conductive terminal (500) respectively inserted in the at least one terminal insertion hole (101); and

at least one elastic sealing element (400) respectively sleeved on the at least one conductive terminal (500),

the method is characterized in that:

each said elastomeric seal (400) including an outer annular portion (410) and an inner annular portion (420), said inner annular portion (420) being fitted over said conductive terminal (500), said conductive terminal (500) expanding said inner annular portion (420) outwardly in a radial direction thereof to bring them into intimate contact;

an annular positioning protrusion (130) is formed on an inner wall of each of the terminal insertion holes (101), the connector further includes a pushing member (300), the pushing member (300) pushes the outer ring portion (410) against the annular positioning protrusion (130) in an axial direction of the conductive terminal (500) to bring the outer ring portion (410) into close contact with the annular positioning protrusion (130).

2. The connector of claim 1, wherein:

a recessed annular transition portion (430) is defined between the outer ring portion (410) and the inner ring portion (420) such that the cross-section of the elastomeric seal (400) is substantially "8" shaped.

3. The connector of claim 2, wherein:

an outer ring receiving groove (131) is formed on an end surface of the annular positioning projection (130), and an outer ring portion (410) of the elastic seal member (400) is positioned in the outer ring receiving groove (131).

4. The connector of claim 3, wherein:

a raised annular transition portion (132) is formed between the outer ring receiving groove (131) and the terminal insertion hole (101), the raised annular transition portion (132) being adapted to be positioned in the recessed annular transition portion (430).

5. The connector of claim 1, wherein:

an inner ring receiving groove (531) is formed on an outer circumferential surface of the conductive terminal (500), and an inner ring portion (420) of the elastic sealing member (400) is positioned in the inner ring receiving groove (531); and is

The conductive terminal (500) has a diameter at the inner ring receiving groove (531) larger than a diameter of the central through hole (401) of the inner ring portion (420) to outwardly expand the inner ring portion (420) in the radial direction.

6. The connector of claim 5, wherein:

the urging member (300) has at least one cylindrical insertion portion (320) adapted to be inserted into the at least one terminal insertion hole (101) from the rear side of the insulating body (100), respectively, the cylindrical insertion portion (320) being adapted to urge the outer ring portion (410) of the elastic seal member (400) forward in the axial direction.

7. The connector of claim 6, wherein:

the connector further comprises a fixed seat (200), wherein the fixed seat (200) is latched to the rear side of the insulating body (100) and is suitable for fixing the pushing piece (300) on the insulating body (100).

8. The connector of claim 7, wherein:

the fixing base (200) comprises at least one elastic locking arm (230) which is suitable for being inserted into the at least one terminal insertion hole (101), and the end part of the elastic locking arm (230) is suitable for abutting against a positioning step surface (532) on the conductive terminal (500) so as to keep the conductive terminal (500) in the terminal insertion hole (101).

9. The connector of claim 8, wherein:

the pushing element (300) further comprises a plate-shaped base (310) located at the rear side of the insulating body (100), the at least one cylindrical insertion part (320) extends forwards from the plate-shaped base (310), and the plate-shaped base (310) is suitable for being fixed on the rear side of the insulating body (100) by the fixing base (200).

10. The connector of claim 9, wherein:

the holder (200) comprises an end plate portion (210), the end plate portion (210) is used for pushing the plate-shaped base portion (310) of the pushing piece (300) on the rear side of the insulating body (100), so that the plate-shaped base portion (310) is fixed on the rear side of the insulating body (100).

11. The connector of claim 10, wherein:

the fixing base (200) further comprises a plurality of elastic buckles (220) connected to edges of the end plate portion (210), a plurality of protrusions (120) are formed on the insulation body (100), and the plurality of elastic buckles (220) are adapted to be respectively buckled on the plurality of protrusions (120) so as to fix the fixing base (200) to the insulation body (100).

12. The connector of claim 8, wherein:

each of the conductive terminals (500) includes a first end portion (510) adapted to be connected to a wire (10), a second end portion (520) adapted to mate with a terminal of a mating connector, and a raised annular locating seat (530) located between the first end portion (510) and the second end portion (520).

13. The connector of claim 12, wherein:

the inner ring accommodating groove (531) is formed on the outer peripheral surface of the annular positioning seat (530), and the rear end surface of the annular positioning seat (530) serves as the positioning step surface (532) of the conductive terminal (500).

14. The connector of claim 12, wherein:

the first end part (510) of the conductive terminal (500) is cylindrical, and the second end part (520) of the conductive terminal (500) is cylindrical;

the cylindrical first end (510) of the conductive terminal (500) is adapted to be crimped onto an end of the wire (10).

15. The connector of claim 12, wherein:

the annular positioning bulge (130) divides the terminal insertion hole (101) into a front part and a rear part (101a and 101b), the first end part (510) and the annular positioning seat (530) of the conductive terminal (500) are accommodated in the rear part (101b) of the terminal insertion hole (101), and the second end part (520) of the conductive terminal (500) penetrates through the through hole on the annular positioning bulge (130) and is accommodated in the front part (101a) of the terminal insertion hole (101).

16. The connector of claim 1, wherein:

a plurality of terminal insertion holes (101) are formed in the insulating body (100), the connector comprises a plurality of conductive terminals (500) and a plurality of elastic sealing elements (400), the conductive terminals (500) are respectively inserted into the terminal insertion holes (101), and the elastic sealing elements (400) are respectively sleeved on the conductive terminals (500).

17. The connector of claim 1, wherein:

a flange-like connection flange (110) is formed on the insulating body (100), and the connector can be connected to a mounting panel via the flange-like connection flange (110).

18. The connector of claim 1, wherein:

the outer diameter of the elastic sealing member (400) is smaller than the diameter of the terminal insertion hole (101) so as not to contact the inner wall surface of the terminal insertion hole (101) in the process of inserting the elastic sealing member (400) fitted around the conductive terminal (500) into the terminal insertion hole (101).