CN109586077B

CN109586077B - Electrical connector and connector assembly

Info

Publication number: CN109586077B
Application number: CN201710927110.6A
Authority: CN
Inventors: 李胜; 丁通豹; 黄永建
Original assignee: Tyco Electronics Shanghai Co Ltd
Current assignee: Tyco Electronics Shanghai Co Ltd
Priority date: 2017-09-29
Filing date: 2017-09-29
Publication date: 2021-02-26
Anticipated expiration: 2037-09-29
Also published as: CN109586077A

Abstract

An electrical connector and a connector assembly are disclosed. The electrical connector is adapted for mating with at least one terminal post of a mating connector in a first direction and comprises: the bottom wall of the shell is provided with at least one opening extending in the first direction; and at least one conductive terminal inserted and fixed in the receiving channel in the second direction, respectively. Each conductive terminal includes: a first crimp portion configured to crimp a conductor of a cable; a pair of clamping arms integrally connected to a first end of the first crimp portion and clamping a post inserted between the pair of clamping arms through the opening; and a pair of elastic sheets which are respectively arranged at two sides of the conductive terminal and are matched with two side walls of the accommodating channel to fix the conductive terminal. The receiving channel allows the conductive terminal to be inserted and fixed in the receiving channel in both a forward and a reverse posture. When the electric connector is assembled by manual or automatic equipment, the conductive terminal can be turned over by 180 degrees without considering that the conductive terminal is in a forward posture and a proper reverse posture.

Description

Electrical connector and connector assembly

Technical Field

Embodiments of the present invention relate to an electrical connector, and more particularly, to an electrical connector for connecting a wire to a post, and a connector assembly.

Background

In an electric apparatus such as a refrigerator and an air conditioner, a compressor (compressor) is used to raise a low-pressure gas into a high-pressure gas, and the compressor sucks a low-temperature and low-pressure refrigerant gas from an intake pipe, compresses the refrigerant gas by a piston driven by operation of a motor of the compressor, and discharges the high-temperature and high-pressure refrigerant gas to an exhaust pipe to provide power to a refrigeration cycle, thereby implementing the refrigeration cycle. The motor of the compressor is generally arranged in a shell of the compressor, the inside and the outside of the shell are transited and welded on the shell through a sealing wire holder formed by metal sintering, and three mutually insulated wiring terminals are arranged on the wire holder. The external electric connector connects an external power source to the inside of the compressor by being electrically connected with the terminal, thereby realizing the driving of the compressor.

At present, the electric connector can realize automatic wire cutting and copper core wire or enameled wire crimping, but because of the limitation of the related structures of the conductive terminals and the shell of the electric connector, the conductive terminals are all inserted into the shell in a one-way insertion mode. Because the conductive terminal can not be inserted into the shell in the positive and negative postures, the electric connector can be assembled manually, the efficiency is low, and errors are easy to occur; meanwhile, the risk that the conductive terminals cannot be inserted in place exists.

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.

An embodiment of one aspect of the present invention provides an electrical connector adapted to mate with at least one post of a mating connector in a first direction. The electrical connector includes: the shell is internally provided with at least one accommodating channel extending in a second direction perpendicular to the first direction, and the bottom wall of the shell is provided with at least one opening extending in the first direction; and at least one conductive terminal inserted and fixed in the receiving channel in the second direction, respectively. Each conductive terminal includes: a first crimp portion configured to crimp a conductor of a cable; a pair of clamping arms integrally connected to a first end of the first crimp portion and configured to clamp a post inserted between the pair of clamping arms through the opening; and the pair of elastic sheets are respectively arranged at two sides of the conductive terminal and are configured to be matched with two side walls of the accommodating channel so as to fix the conductive terminal. The receiving channel is configured to allow the conductive terminal to be inserted and secured in the receiving channel in both a positive and a negative attitude.

According to an embodiment of the present invention, each of the conductive terminals further includes a second press-contact portion formed at a second end of the first press-contact portion and configured to be press-contacted to an outside of a part of the protective cover of the cable, and the insertion end of the receiving passage is configured to receive the second press-contact portion of the conductive terminal in a state where the conductive terminal is inserted in both of the front and rear postures.

According to the electrical connector of an embodiment of the present invention, a height of the second crimp part in a first direction is smaller than a height of the clamp arm, and a width in a third direction perpendicular to the first and second directions is larger than a width of the clamp arm; and the upper and lower portions of the insertion end of each of the receiving channels have substantially the same width in the third direction.

According to an embodiment of the present invention, the resilient plate extends from the clamping arm toward the first press-connecting portion and slantingly away from each other, two side walls of the receiving channel are provided with protrusions, and the resilient plate and the protrusions are combined to prevent the conductive terminal from exiting the receiving channel.

According to the electrical connector of one embodiment of the present invention, the holding arms are respectively provided with the arc portions protruding away from each other, and the terminal post is inserted between the arc portions of the two holding arms through the opening.

According to the electrical connector of one embodiment of the present invention, each of the arc-shaped portions is provided with first chamfers on the upstream side and the downstream side of the first direction, respectively, to guide the terminal post to be inserted between the arc-shaped portions of the two clamping arms.

According to the electrical connector of one embodiment of the present invention, each of the conductive terminals further includes a base portion extending in the second direction, and the gripping arm, the first crimp portion, and the second crimp portion are bent upward from both sides of the base portion.

According to the electrical connector of one embodiment of the present invention, a connecting arm is provided between the pair of holding arms, and a downstream side of the connecting arm in the second direction is provided with a second chamfer to guide the insertion of the holding arm into the receiving passage.

According to the electrical connector of an embodiment of the present invention, the first reinforcing rib extending in the second direction is provided on the middle portions of the upper wall and the lower wall of the receiving passage, and the inside of the receiving passage has a vertically symmetrical shape with respect to a plane defined by the second and third directions.

According to the electrical connector of one embodiment of the present invention, the two side walls of the accommodating channel are provided with second reinforcing ribs extending in the second direction.

According to the electrical connector of one embodiment of the present invention, three receiving passages are provided in the housing, and among the three receiving passages, one intermediate receiving passage is provided between the other two side receiving passages, the intermediate receiving passage projects out of the two side receiving passages on the upstream side in the second direction, and a notch is formed between the two side receiving passages on the downstream side in the second direction.

According to the electrical connector of one embodiment of the present invention, the housing is provided with positioning protrusions at both sides thereof.

According to the electrical connector of one embodiment of the present invention, the bottom wall of the housing extends obliquely from the upstream side of the two side wall accommodating passages to the outside of the outer wall of the intermediate accommodating passage.

According to an embodiment of another aspect of the present invention, there is provided a connector assembly including: an electrical connector as in any of the above embodiments; and a mating connector electrically connected with the electrical connector. The mating connector includes: fitting the housing; a base mounted in the mating housing; and the two ends of the wiring terminal respectively extend out of the two sides of the matching shell, so that the wiring terminal penetrates through the opening of the electric connector and is inserted between the two clamping arms.

In the electrical connector and the connector assembly according to the above-described respective exemplary embodiments of the present invention, since the receiving channel is configured to allow the conductive terminal to be inserted and fixed in the receiving channel in both the forward and reverse postures, the conductive terminal can be turned over by 180 degrees when the electrical connector is assembled by a manual or automated apparatus regardless of whether the conductive terminal is in the forward posture or in the proper reverse posture. Therefore, the efficiency of manually or automatically assembling the electric connector can be improved, the manual assembling errors are reduced, and the product quality 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 an exploded schematic view of a connector assembly according to one embodiment of the invention;

fig. 2 is a perspective view of an electrical connector according to one embodiment of the present invention, wherein the conductive terminals are inserted into the housing in a first position;

fig. 3 is a perspective view of the housing of the electrical connector shown in fig. 2;

FIG. 4 shows a partially cut-away perspective view of the housing shown in FIG. 3;

fig. 5 is a perspective view of the conductive terminal shown in fig. 2;

fig. 6 is another perspective view of the conductive terminal shown in fig. 2;

fig. 7 is a perspective view of an electrical connector according to another embodiment of the present invention, wherein the conductive terminals are inserted into the housing in a second position;

fig. 8 shows a cross-sectional view of the conductive terminal inserted into the housing in a forward position;

fig. 9 shows a cross-sectional view of the conductive terminal inserted into the housing in a reverse attitude;

FIG. 10 is an enlarged view of portion A of FIG. 8; and

fig. 11 is an enlarged view of portion a of fig. 8, wherein the conductive terminals are not shown.

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 an embodiment of the present invention, a connector is adapted to be inserted into at least one post of a mating connector in a first direction. The electrical connector includes: the shell is internally provided with at least one accommodating channel extending in a second direction perpendicular to the first direction, and the bottom wall of the shell is provided with at least one opening extending in the first direction; and at least one conductive terminal inserted and fixed in the receiving channel in the second direction, respectively. Each conductive terminal includes: a first crimp portion configured to crimp a conductor of a cable; a pair of clamping arms integrally connected to a first end of the first crimp portion and configured to clamp a post inserted between the pair of clamping arms through the opening; and the pair of elastic sheets are respectively arranged at two sides of the conductive terminal and are configured to be matched with two side walls of the accommodating channel so as to fix the conductive terminal. The receiving channel is configured to allow the conductive terminal to be inserted and secured in the receiving channel in both a positive and a negative attitude.

Fig. 1 shows an exploded schematic view of a connector assembly according to one embodiment of the present invention. As shown in fig. 1, the connector assembly of the embodiment of the present invention may be applied to a compressor of an electric appliance such as a refrigerator, an air conditioner, a washing machine, and the like. A connector assembly according to one embodiment of the invention includes: an electrical connector 100, and a mating connector 200 electrically connected to the electrical connector 100 mounted on an electrical device. Generally, the electrical connector 100 is electrically connected to a cable 300, and the mating connector 200 is provided on an electrical device, such as a compressor of an air conditioner, to supply power to a motor of the compressor.

As shown in fig. 1, the mating connector 200 includes: a generally cylindrical mating housing 201, a base 203 mounted in the mating housing 201, and at least one (3 shown in the drawing) post 202 extending in a first direction (up-down direction in fig. 1). The 3 binding posts 202 are distributed on the base 203 in a regular triangle, two ends of the binding posts 202 respectively extend out from two sides of the shell 201, one end of each binding post 202 is electrically connected with the electric connector 100, and the other end of each binding post 202 is electrically connected with the electric equipment. The electrical connector 100 includes: a housing 1 and at least one conductive terminal 2 mounted in the housing 1.

Fig. 2 is a perspective view of an electrical connector according to one embodiment of the present invention, wherein the conductive terminals are inserted into the housing in a first position; fig. 3 is a perspective view of the housing of the electrical connector shown in fig. 2; FIG. 4 shows a partially cut-away perspective view of the housing shown in FIG. 3; fig. 5 is a perspective view of the conductive terminal shown in fig. 2; fig. 6 is another perspective view of the conductive terminal shown in fig. 2; fig. 7 is a perspective view of an electrical connector according to another embodiment of the present invention, wherein the conductive terminals are inserted into the housing in a second position; fig. 8 shows a cross-sectional view of the conductive terminal inserted into the housing in a forward position; fig. 9 shows a cross-sectional view of the conductive terminal inserted into the housing in a reverse attitude; FIG. 10 is an enlarged view of portion A of FIG. 8; and FIG. 11 is an enlarged view of portion A of FIG. 8, wherein the conductive terminals are not shown.

As shown in fig. 2 to 4 and 11, 3 accommodating passages 11 extending in a second direction (length direction) perpendicular to the first direction (height direction) are formed in a housing 1 made of an insulating material, and at least one opening 111 extending in the first direction is provided on a bottom wall 12 of the housing 1 of each accommodating passage 11. When the electrical connector 100 is coupled with the mating connector 200, the posts 202 of the mating connector 200 are inserted into the receiving passages 11 through the openings 111 in the first direction.

As shown in fig. 8 and 9, the 3 conductive terminals 2 are inserted and held in the receiving passages 11 in the second direction, respectively. As shown in fig. 1, 5 and 6, each conductive terminal 2 includes: a first crimp part 21 configured to crimp a conductor of a cable 300 (fig. 1); a pair of clamping arms 22 integrally connected to a first end of the first crimp part 21 and configured to clamp the post 202 inserted between the pair of clamping arms 22 through the opening 111 of the housing 1; and a pair of resilient pieces 25 respectively disposed at both sides of the conductive terminal 2 and configured to cooperate with both sidewalls of the receiving channel 11 to fix the conductive terminal 2. As shown in fig. 3 and 10, the receiving channel 11 is configured to allow the conductive terminal 2 to be inserted and fixed in the receiving channel 11 in both the front and rear postures.

In one embodiment, each of the conductive terminals 2 further includes a second press-fitting portion 23 formed at the second end of the first press-fitting portion 21 and configured to be press-fitted outside a portion of the protective cover of the cable, and the insertion end 112 of the receiving channel 11 is configured to receive the second press-fitting portion 23 of the conductive terminal 2 in a state where the conductive terminal 2 is inserted in both of the front and rear postures.

In one embodiment, each of the conductive terminals 2 further includes a base 24 extending in the second direction, and the gripping arm 22, the first press-fitting part 21 and the second press-fitting part 23 are bent upward from both sides of the base 24. Thus, the entire conductive terminal 2 can be manufactured by a single piece of material, such as a copper sheet or a metal sheet, by a mechanical process, such as cutting, stamping, bending, etc.

As shown in fig. 5, in the forward posture, the clamp arm 22, the first crimp portion 21, and the second crimp portion 23 are located at an upper portion of the base 24; as shown in fig. 6, in the reverse posture, the clamp arm 22, the first crimp portion 21, and the second crimp portion 23 are located at a lower portion of the base 24.

As shown in fig. 5 and 6, the second crimp portion 23 has a height in the first direction smaller than that of the clamp arm 22, and a width in a third direction (width direction) perpendicular to the first and second directions larger than that of the clamp arm 22. In this way, the outer profile of the conductive terminal 2 is asymmetrical in the first direction (thickness direction). The upper and lower portions of the insertion end 112 of each receiving channel 11 have substantially the same width in the third direction.

It will be appreciated that, as seen in figures 3, 8-11, the contact portion 22 is used as an insertion end when inserting the conductive terminal into the receiving channel, as the conductive terminal 2 has different widths at the gripping arms, the first crimp portion 21 and the second crimp portion 23. In order to tightly hold the conductive terminals 2 in the receiving channels 11 of the housing 1, the receiving channels 11 have different widths throughout the length direction. Since the upper and lower portions of the insertion end 112 of each receiving channel 11 have substantially the same width in the third direction, it is possible to allow the conductive terminal 2 to be inserted into the receiving channel 11 in both the front and rear postures and to receive the second crimp part 23 of the conductive terminal 2.

Referring to fig. 5 and 6, in one embodiment, the resilient pieces 25 extend obliquely away from each other from the holding arms 22 toward the first press-fitting portion 21, and the two side walls 113 of the receiving channel 11 are provided with protrusions 114, and the resilient pieces 25 are combined with the protrusions 114 to prevent the conductive terminal 2 from exiting the receiving channel 11. During the process of pushing the conductive terminal 2 into the receiving channel 11, the resilient piece 25 will abut against the side of the protrusion 114 away from the insertion end 112 after passing over the protrusion 114, thereby preventing the conductive terminal 2 from exiting the receiving channel 11.

As shown in fig. 6, in one embodiment, the two holding arms 22 are respectively provided with arc portions 221 protruding away from each other, and the post 202 of the mating connector 200 is inserted between the arc portions 221 of the two holding arms 22 through the opening 111 in the housing. The insertion of the terminal 202 between the two holding arms 22 is facilitated by providing the arc-shaped portion 221, and the side wall of the receiving channel 11 presses the outside of the arc-shaped portion 221, thereby maintaining a stable electrical connection between the conductive terminal 2 and the terminal 202.

As shown in fig. 6, each of the arc-shaped portions 221 is provided with a first chamfer 222 on the upstream side (upper side in fig. 6) and the downstream side (lower side in fig. 6) in the first direction, respectively, to guide the insertion of the post 202 between the arc-shaped portions 221 of the two clamping arms 22. Further, a connecting arm 223 is provided between the pair of gripper arms 22, and a downstream side of the connecting arm 223 in the second direction is provided with a second chamfer 224 to guide the insertion of the gripper arms 22 into the accommodating passage 11.

As shown in fig. 3, 4 and 11, the middle portions of the upper and lower walls of the accommodating passage 11 are provided with first ribs 115 extending in the second direction, and the interior of the accommodating passage 11 has a vertically symmetrical shape with respect to a plane (horizontal plane) defined by the second and third directions. This facilitates the insertion of the conductive terminal 2 into the receiving passage 11 in both the front and rear states. Further, the two side walls 113 of the accommodating channel 11 are provided with second reinforcing ribs 116 extending in the second direction. The first and

second ribs

115 and 116 can press the outer portion of the conductive terminal 2, thereby pressing the conductive terminal 2 to be centered and firmly holding the conductive terminal 2 in the receiving channel 11.

As shown in fig. 2, 7-9, 3 accommodating passages 11 are provided in the housing 1, and of the three accommodating passages 11, one intermediate accommodating passage 117 is provided between the other two side accommodating passages 118, the intermediate accommodating passage 117 projects out of the two side accommodating passages 118 on the upstream side in the second direction, and a notch 119 is formed between the two side accommodating passages 118 on the downstream side in the second direction. In this way, the three receiving passages form a substantially "pin" shape, and the openings 111 of the 3 receiving passages 11 are arranged in a manner opposite to that of the posts 202, so that the 3 posts are inserted into the 3 receiving passages, respectively. The bottom wall 12 of the housing 1 extends obliquely from the upstream side of the two side-wall accommodating passages to the outside of the outer wall of the intermediate accommodating passage to form a substantially triangular connecting wall 121. In this way, the strength of the housing 1 can be increased, and the conductive terminals 2 are inserted into the side receiving channels 118, respectively.

As shown in fig. 2, 4 and 7, the housing 1 is provided at both sides with positioning protrusions 14. By providing the positioning projections 14, it is possible to position the housing 1 and avoid holding the housing 1 in an erroneous state when the conductive terminal 2 is assembled into the housing 1, when the electrical connector 100 is mounted to the mating connector 200, or when the electrical connector is inspected.

As shown in fig. 1, according to an embodiment of another aspect of the present invention, there is provided a connector assembly including: the electrical connector 100 and the mating connector 200 according to any of the above embodiments. The mating connector 200 is electrically connected to the electrical connector 100, and includes: a mating housing 201; a base 203 mounted in the mating housing 201; and 3 posts 202. The post 202 is mounted on the base 203, and both ends of the post 202 protrude from both sides of the mating housing 201, respectively, so that the post 202 is inserted between the two holding arms 22 through the opening 111 of the electrical connector 100.

Although the embodiment of 3 posts and 3 receiving channels is described above, the present invention is not limited thereto. The mating connector may comprise 1 or 2 posts and the electrical connector comprises 1 or 2 receiving channels, respectively.

In the electrical connector and the connector assembly according to the above-described respective exemplary embodiments of the present invention, since the insertion end of the receiving channel is configured to allow the conductive terminal to be inserted into the receiving channel in both the forward and reverse postures and to receive the second press-fitting part of the conductive terminal, the conductive terminal can be turned over by 180 degrees when the electrical connector is assembled by a manual or automated apparatus regardless of whether the conductive terminal is in the forward posture or in the reverse posture as appropriate. Therefore, the efficiency of manually or automatically assembling the electric connector can be improved, the manual assembling errors are reduced, and the product quality is 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. An electrical connector adapted for mating with at least one terminal post of a mating connector in a first direction, the electrical connector comprising:

a housing (1) inside which at least one housing channel (11) extending in a second direction perpendicular to said first direction is formed, each of said housing channels being provided with at least one opening (111) extending in said first direction on a bottom wall of the housing; and

at least one conductive terminal (2) respectively inserted and fixed in the housing channel in the second direction, each conductive terminal comprising:

a first crimping portion (21) configured to crimp a conductor of a cable;

a pair of clamping arms (22) integrally connected to a first end of the first crimp portion and configured to clamp a post inserted between the pair of clamping arms through the opening; and

a pair of spring plates respectively arranged at two sides of the conductive terminal (2) and configured to be matched with two side walls of the accommodating channel to fix the conductive terminal,

wherein the receiving channel has an inner portion having a vertically symmetrical shape with respect to a plane defined by the second direction and a third direction perpendicular to the first direction and the second direction, and is configured to allow the conductive terminal to be inserted and fixed in the receiving channel in both of forward and reverse postures.

2. The electrical connector of claim 1, wherein each of the conductive terminals further includes a second crimp portion (23) formed at the second end of the first crimp portion and configured to be crimped outside a portion of the protective covering of the cable, the insertion end (112) of the receiving channel being configured to receive the second crimp portion of the conductive terminal with the conductive terminal inserted in both the forward and reverse orientations.

3. The electrical connector of claim 2, wherein: the height of the second crimping part in the first direction is smaller than that of the clamping arm, and the width of the second crimping part in the third direction is larger than that of the clamping arm; and

an upper portion and a lower portion of the insertion end of each of the receiving channels have substantially the same width in the third direction.

4. The electrical connector of any of claims 1-3, wherein:

the resilient pieces extend obliquely away from each other from the gripping arms toward the first crimping portion,

the conductive terminal is provided with a plurality of conductive terminals, and the conductive terminals are arranged in the accommodating channel.

5. The electrical connector of any of claims 1-3, wherein:

the clamping arms are respectively provided with protruding arc parts which are far away from each other, and the wiring terminal penetrates through the opening to be inserted between the arc parts of the two clamping arms.

6. The electrical connector of claim 5, wherein:

each of the arc-shaped portions is provided with first chamfers on an upstream side and a downstream side in the first direction, respectively, to guide the terminal post to be inserted between the arc-shaped portions of the two clamping arms.

7. The electrical connector of any of claims 1-3, wherein:

each conductive terminal further includes a base portion extending in the second direction, the gripping arm, the first crimp portion, and the second crimp portion being bent upward from both sides of the base portion.

8. The electrical connector of any of claims 1-3, wherein:

a connecting arm is provided between the pair of gripper arms, and a downstream side of the connecting arm in the second direction is provided with a second chamfer to guide the gripper arms to be inserted into the accommodating passage.

9. The electrical connector of claim 1, wherein:

and second reinforcing ribs extending along the second direction are arranged on two side walls of the accommodating channel.

10. The electrical connector of any of claims 1-3, wherein:

three accommodating passages are provided in the housing, and of the three accommodating passages, one intermediate accommodating passage is provided between the other two side accommodating passages, the intermediate accommodating passage projects out of the two side accommodating passages on the upstream side in the second direction, and a notch is formed between the two side accommodating passages on the downstream side in the second direction.

11. The electrical connector of claim 10, wherein:

and positioning protrusions are arranged on two sides of the shell.

12. The electrical connector of claim 11, wherein:

the bottom wall of the housing extends obliquely from the upstream sides of the two side wall accommodating passages to the outside of the outer wall of the intermediate accommodating passage.

13. A connector assembly comprising:

the electrical connector of any one of claims 1-12; and

a mating connector electrically connected with the electrical connector, the mating connector comprising:

fitting the housing;

a base mounted in the mating housing; and

and the two ends of the binding post respectively extend out of the two sides of the matching shell, so that the binding post passes through the opening of the electric connector and is inserted between the two clamping arms.