Electric connector

Abstract

The utility model discloses an electric connector, which comprises an insulation body provided with a main body part, a step part and a front base part, the step part is provided with a bump, the front surface of the bump extends forwards to form a connecting arm, the connecting arm is connected with the bump and the front base part, and the front base part is provided with a plurality of through holes. Internal spaces are respectively formed between the outer side surfaces of the two connecting arms and the inner side surfaces of the left side wall and the right side wall of the step part; the terminal group is arranged in the insulating body, the terminal group is provided with a plurality of terminals and an insulator, the left side surface and the right side surface of the insulator are sunken inwards to form an accommodating space, and the connecting arm is arranged in the accommodating space; the central sheet is provided with a main board and two bent arms arranged on the left side and the right side of the main board, the main board is arranged in the insulator, and the bent arms are arranged in the internal space and connected to the outer side surfaces of the connecting arms. Therefore, the electric connector provided by the utility model has better structural strength.

Description

Technical Field

[0001] The utility model relates to an electric connector, in particular to an electric connector with better structural strength. Background Art

[0002] Among the types of electrical connectors commonly used in various electronic products, the connectors with Universal Serial Bus (USB) specifications are the most widely used. With the advancement of technology, there are more and more types of USB, such as USB 2.0, USB 3.0, Micro USB, Mini USB or USB TYPE-C. Among them, USB TYPE-C connectors have been widely used in various electronic products.

[0003] Chinese Patent Publication No. 213584239 discloses "a stable and reliable TYPE-C socket connector", including an insulating body, an upper row terminal group, a lower row terminal group, a middle clip and a shielding shell; the insulating body includes an upper insulating member, a lower insulating member and an outer insulating member; the upper row terminal group is fixed together with the upper insulating member by insert molding, and the upper row terminal group has an upper power terminal and an upper grounding terminal; the lower row terminal group is fixed together with the lower insulating member by insert molding, and the lower row terminal group has a lower power terminal and a lower grounding terminal; the middle clip is sandwiched between the upper insulating member and the lower insulating member and is fixed together with the outer insulating member by insert molding.

[0004] However, the insulating body and the middle clip of the above-mentioned stable and reliable TYPE-C socket connector are prone to swinging left and right due to insufficient structural strength, pulling the plastic material and the terminal to break and deform, thereby causing damage to the TYPE-C connector.

[0005] Therefore, it is necessary to provide an electrical connector with better structural strength. Summary of the invention

[0006] The purpose of the utility model is to provide an electrical connector to address the defects and shortcomings of the prior art.

[0007] To achieve the above-mentioned purpose, the utility model discloses an electrical connector, comprising: an insulating body, the insulating body is provided with a main body, the front end of the main body extends forward to form a step portion, the front end of the step portion forms a front base, the inner side surfaces of the left and right side walls of the step portion respectively extend inward to form a convex block, the front surface of the convex block extends forward to form a connecting arm, the connecting arm extends out of the front end of the step portion, the connecting arm is connected between the convex block and the front base, and the outer side surfaces of the two connecting arms are connected to the inner side surfaces of the left and right side walls of the step portion. An internal space is formed between the surfaces respectively; a terminal group is arranged in the insulating body, the terminal group is provided with a plurality of terminals and an insulator, the plurality of the terminals are fixedly arranged in the insulator, the left and right sides of the insulator are recessed inwardly to form a receiving space, and the connecting arm is arranged in the receiving space; and a center piece, provided with a main board and two bent arms extending forward from the left and right sides of the main board respectively, the main board is arranged in the insulator of the terminal group, and the bent arm is arranged in the internal space and connected to the outer surface of the connecting arm.

[0008] As a further improvement, a first positioning concave surface is formed at the connection between the main board and the bending arm, and the protrusion is fixed to the first positioning concave surface. Each of the bending arms is provided with a bending portion, an extension arm and a hook. The side edge of the main board is bent vertically upward and extended to form the bending portion. The front end of the bending portion extends obliquely downward and then extends forward to form the extension arm. The front end of the extension arm is bent outward and then extends forward, and then extends inward and then extends backward to form the hook. The step portion covers the bending portion and the rear end of the extension arm. The front end and the middle part of the extension arm are arranged on the outer side surface of the connecting arm. The left and right sides of the front base respectively cover the two hooks, and the rear end of the extension arm is arranged in the internal space.

[0009] As a further improvement, the connecting arm is provided with a base, the base is connected to the step portion and the front base, the outer side of the base protrudes outward to form a protrusion, and the middle part of the extension arm is arranged on the outer side of the protrusion.

[0010] As a further improvement, a head, a positioning portion and an arc-shaped portion are respectively formed on the left and right sides of the front base, the rear end of the head is recessed inward to form the positioning portion, the rear end of the positioning portion is recessed inward to form the arc-shaped portion, the arc-shaped portion is arranged on the outer side of the front end of the connecting arm, a first recess is formed between the front end of the protruding portion and the base, and the first recess is arranged between the arc-shaped portion and the protruding portion.

[0011] As a further improvement, the terminal group includes an upper terminal group and a lower terminal group, the upper terminal group and the lower terminal group are respectively provided with a plurality of the terminals and the insulators, the two outermost terminals in the upper terminal group are arranged above the connecting arm, and the two outermost terminals in the lower terminal group are arranged below the connecting arm.

[0012] As a further improvement, the insulator is provided with a main body portion, the front end of the main body portion extends forward to form a connecting portion, the front end of the connecting portion extends forward to form a tongue portion, the main body portion is arranged in the main body portion, the connecting portion is arranged in the stepped portion, the tongue portion is arranged between the stepped portion and the front base, the outer side surface of the tongue portion is flush with the outer side surface of the protruding portion, the tongue portion fills the first recess, and the front base portion covers the front end of the tongue portion.

[0013] As a further improvement, the left and right sides of the lower surface of the tongue of the insulator of the upper terminal group extend downward to form a limiting portion, and the left and right sides of the upper surface of the tongue of the insulator of the lower terminal group extend upward to form the limiting portion, and the accommodation space is formed between the lower surface of the tongue of the insulator of the upper terminal group, the upper surface of the tongue of the insulator of the lower terminal group and the outer side surfaces of the four limiting portions, and the connecting arm is arranged in the accommodation space.

[0014] As a further improvement, the inner side surface of the limiting portion extends inward to form a clamping portion, and the left and right sides of the main board are respectively recessed inward to form a second positioning concave surface, and the second positioning concave surface is arranged at the front end of the first positioning concave surface, and the clamping portion is fixed to the second positioning concave surface.

[0015] As a further improvement, the two side surfaces of the tongue of the insulator of the upper terminal group and the two side surfaces of the tongue of the insulator of the lower terminal group are respectively recessed inward to form a second recess, the second recess is formed behind the limiting portion, and the protrusion of the insulating body is arranged in the second recess.

[0016] As a further improvement, each of the hooks includes a first bent foot, a second bent foot and a third bent foot, the first bent foot is formed by bending the front end of the extension arm outward and then extending forward, the first bent foot is arranged in the arc portion, the second bent foot is formed by extending the front end of the first bent foot forward and then bending toward the main board, part of the second bent foot is arranged in the positioning portion, the third bent foot is formed by extending the free end of the second bent foot inward and then bending backward, and the head covers part of the second bent foot and the third bent foot.

[0017] As described above, the utility model electrical connector adopts an innovative structural design, wherein the connecting arm is disposed on the left and right sides between the step portion and the front base, thereby increasing the structural strength of the insulating body. The receiving space is formed between the two limiting portions, the tongue portion of the upper terminal group, and the tongue portion of the lower terminal group. The connecting arm of the insulating body is disposed in the receiving space. The step portion of the insulating body covers the bending portion and part of the extension arm, and the left and right sides of the front base of the insulating body respectively cover the two hooks. Therefore, the utility model electrical connector has better structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the electrical connector of the utility model.

[0019] Figure 2 It is a partial exploded view of the electrical connector of the present invention.

[0020] Figure 3 It is a partial exploded view of the electrical connector of the present invention.

[0021] Figure 4 It is a three-dimensional diagram of the insulating body of the electrical connector of the present invention.

[0022] Figure 5 This is an exploded view of the upper terminal set of the electrical connector of the present invention.

[0023] Figure 6 This is another exploded view of the upper terminal assembly of the electrical connector of the present invention.

[0024] Figure 7 It is a three-dimensional diagram of the center piece of the electrical connector of the present invention.

[0025] Figure 8 It is a schematic diagram of the electrical connector of the utility model.

[0026] Fig. 9 The utility model electric connector is along Figure 8 Cross-sectional view of line IX-IX.

[0027] The descriptions of the reference numerals in the figures are as follows.

[0028] Electrical connector 100 Insulation body 1

[0029] Main body 11 Step 12

[0030] Top wall 121 Bottom wall 122

[0031] Side wall 123 Front base 13

[0032] Head 131 Positioning portion 132

[0033] Arc portion 133 Protrusion 14

[0034] Connecting arm 15 Base 151

[0035] Protrusion 152 First notch 153

[0036] Internal space 16 Terminal group 2

[0037] Upper terminal group 21 Terminal 211

[0038] Insulator 212 Main body 2121

[0039] Connecting part 2122 Tongue part 2123

[0040] Limiting portion 2124 Clamping portion 2125

[0041] Accommodation space 2126 Second recess 2127

[0042] Fixed portion 213 Contact portion 214

[0043] Bending portion 215 Extending portion 216

[0044] Welding portion 217 Lower terminal group 22

[0045] Center chip 3 Main board 31

[0046] Bending arm 32 Bending portion 321

[0047] Extension arm 322 Hook 323

[0048] First bend 324 Second bend 325

[0049] The third curved leg 326 and the first positioning concave surface 33

[0050] Second positioning concave surface 34 shielding sheet 4

[0051] Colloid 5 Insulation shell 6

[0052] Metal casing group 7. DETAILED DESCRIPTION

[0053] In order to explain the technical content, structural features, purpose and effect of the electrical connector 100 of the present invention in detail, the following examples are given and detailed descriptions are provided with accompanying drawings. In this embodiment, the electrical connector 100 of the present invention is a TYPE-C connector. In specific implementation, the electrical connector 100 of the present invention can also be other types of connectors.

[0054] See also Figures 1 to 3 The utility model electric connector 100 comprises an insulating body 1, a terminal group 2, a center piece 3, two shielding pieces 4, a colloid 5, an insulating shell 6 and a metal shell group 7. The insulating body 1 covers the center piece 3 and the terminal group 2, the terminal group 2 is fixed in the insulating body 1, the center piece 3 is arranged in the middle of the terminal group 2, and is fixed in the insulating body 1. The two shielding pieces 4 are arranged on the upper and lower sides of the insulating body 1. The colloid 5 covers the rear end of the insulating body 1 and is arranged at the rear end of the insulating shell 6. The colloid 5 is used to fill the gap between the insulating shell 6 and the insulating body 1 to prevent water from flowing into the rear end of the utility model electric connector 100 and causing damage to the utility model electric connector 100. The insulating body 1 is fixed in the insulating shell 6. The metal shell group 7 is fixed on the upper and lower sides of the insulating shell 6, and the metal shell group 7 is used for shielding interference and grounding.

[0055] See also Figure 3 and Figure 4 The insulating body 1 is provided with a main body 11 and a stepped portion 12, a front base 13, a protrusion 14, two connecting arms 15 and an internal space 16. The front end of the main body 11 extends forward to form the stepped portion 12, and the front end of the stepped portion 12 extends forward to form the front base 13. The front base 13 covers the front end of the terminal group 2. The inside of the stepped portion 12 is hollow, and the inner side surfaces of the left and right side walls of the stepped portion 12 extend inward to form the protrusion 14 respectively. More specifically, the stepped portion 12 is provided with a top wall 121, a bottom wall 122 and two side walls 123. The inner side surfaces of the two side walls 123 of the stepped portion 12 extend inward to form the protrusion 14 respectively, and the protrusion 14 is separated from the top wall 121 and the bottom wall 122. The protrusion 14 is fixed to the corresponding mechanism of the center piece 3 to realize the positioning and fixing of the insulating body 1 and the center piece 3. The front surface of the protrusion 14 extends forward to form the connecting arm 15. The connecting arm 15 extends out of the front end of the step portion 12. The connecting arm 15 is arranged on the left and right sides between the step portion 12 and the front base 13. The two ends of the connecting arm 15 are respectively connected to the protrusion 14 of the step portion 12 and the front base 13. The connecting arm 15 is separated from the side wall 123 of the step portion 12, so that the internal space 16 is formed between the connecting arm 15 and the side wall 123 of the step portion 12. The corresponding mechanism of the center piece 3 is arranged on the left and right sides of the front base 13 and the two connecting arms 15 through the internal space 16.

[0056] A head 131, a positioning portion 132 and an arc-shaped portion 133 are formed on the left and right sides of the front base 13, respectively. The head 131 covers the corresponding mechanism of the center piece 3 to achieve the positioning and retention of the insulating body 1 and the center piece 3. The rear end of the head 131 is recessed inward to form the positioning portion 132. The corresponding mechanism of the center piece 3 is arranged in the positioning portion 132 to achieve the positioning and retention of the insulating body 1 and the center piece 3. The rear end of the positioning portion 132 is recessed inward to form the arc-shaped portion 133. The arc-shaped portion 133 is arranged on the outside of the front end of the connecting arm 15. The corresponding mechanism of the center piece 3 is arranged in the positioning portion 132 to achieve the positioning and retention of the insulating body 1 and the center piece 3. The front base 13 covers the front end of the terminal group 2 and the front end of the center piece 3, thereby enhancing the structural strength of the electrical connector 100 of the utility model.

[0057] The connecting arm 15 is provided with a base 151, a protruding portion 152 and a first notch 153. The base 151 connects the protruding block 14 of the step portion 12 and the front base 13, thereby increasing the structural strength of the insulating body 1. The outer surface of the base 151 protrudes outward to form the protruding portion 152. The first notch 153 is formed between the front end of the protruding portion 152 and the base 151, and the first notch 153 is disposed between the arc-shaped portion 132 of the front base 13 and the protruding portion 152. The corresponding mechanism of the terminal set 2 fills the first notch 153 to achieve the positioning and retention of the insulating body 1 and the terminal set 2, thereby enhancing the structural strength of the electrical connector 100 of the utility model.

[0058] See also Figure 3 , Figures 5 to 9 , the terminal group 2 is arranged in the insulating body 1. The terminal group 2 includes an upper terminal group 21 and a lower terminal group 22, and the center piece 3 is arranged between the upper terminal group 21 and the lower terminal group 22. The upper terminal group 21 and the lower terminal group 22 are respectively provided with a plurality of terminals 211 and an insulator 212, and the plurality of terminals 211 are fixed in the insulator 212. In this embodiment, the two outermost terminals 211 in the upper terminal group 21 are arranged above the base 151 of the connecting arm 15 of the insulating body 1, and the two outermost terminals 211 in the lower terminal group 22 are arranged below the base 151 of the connecting arm 15 of the insulating body 1.

[0059] Each of the terminals 211 is provided with a fixing portion 213, a contact portion 214, a bending portion 215, an extension portion 216 and a welding portion 217. The front end of the fixing portion 213 extends forward to form the contact portion 214, and the rear end of the fixing portion 213 is bent downward to form the bending portion 215. The lower end of the bending portion 215 extends downward to form the extension portion 216. The lower end of the extension portion 216 is bent backward and extends to form the welding portion 217.

[0060] The insulator 212 is provided with a main body 2121, a connecting portion 2122 and a tongue 2123. The front end of the main body 2121 extends forward to form the connecting portion 2122, and the front end of the connecting portion 2122 extends forward to form the tongue 2123. The main body 2121 is disposed in the main body 11 of the insulating body 1. The connecting portion 2122 is disposed in the stepped portion 12 of the insulating body 1. The tongue 2123 is disposed between the stepped portion 12 of the insulating body 1 and the front base 13. In this embodiment, the outer side surface of the tongue 2123 is flush with the outer side surface of the protruding portion 152 of the insulating body 1. The tongue 2123 fills the first notch 153 of the insulating body 1 to achieve the positioning and fixing of the terminal set 2 and the insulating body 1. The front base 13 covers the front end of the tongue 2123. The fixing portion 213 is fixed in the main body portion 2121 and the connecting portion 2122 of the insulator 212 and is covered by the main body portion 2121 and the connecting portion 2122 of the insulator 212. The contact portion 214 is fixed in the tongue portion 2123 of the insulator 212. The welding portion 217 extends out of the bottom of the main body portion 2121 of the insulator 212.

[0061] The left and right ends of the lower surface of the tongue 2123 extend downward to form a limit portion 2124, respectively. The center piece 3 is disposed between the two limit portions 2124, and the connecting arm 15 of the insulating body 1 is connected to the outer side of the limit portion 2124. A gap is formed between the outer side of the limit portion 2124 and the left and right sides of the tongue 2123. When the electrical connector 100 of the utility model is assembled, the upper terminal group 21 and the lower terminal group 22 are assembled together, and a receiving space 2126 is formed between the two limit portions 2124, the tongue 2123 of the upper terminal group 21, and the tongue 2123 of the lower terminal group 22 in the upper and lower directions of the electrical connector 100 of the utility model. The connecting arm 15 of the insulating body 1 is disposed in the receiving space 2126. The inner side surface of the limit portion 2124 extends inward to form a clamping portion 2125. The clamping portion 2125 is fixed in the corresponding mechanism of the center piece 3 to achieve positioning and fixing of the terminal set 2 and the center piece 3 .

[0062] In this embodiment, the limiting portions 2124 are formed on the left and right sides of the lower surface of the insulator 212 of the upper terminal group 21, and the limiting portions 2124 are formed on the left and right sides of the upper surface of the insulator 212 of the lower terminal group 22. The left and right sides of the front end of the tongue 2123 of the insulator 212 are recessed inward to form the receiving space 2126. The receiving space 2126 is formed between the outer side surface of the limiting portion 2124 and the lower surface of the insulator 212 of the upper terminal group 21 and the upper surface of the insulator 212 of the lower terminal group 22.

[0063] In this embodiment, the structure of the lower terminal set 22 is substantially the same as that of the upper terminal set 21, and will not be described in detail here. The two sides of the tongue portion 2123 of the insulator 212 are recessed inward to form a second notch 2127, and the second notch 2127 is formed behind the stop portion 2124, and the protrusion 14 of the stepped portion 12 of the insulating body 1 is disposed in the second notch 2127.

[0064] See also Figure 7 The center piece 3 is provided with a main board 31, a pair of bending arms 32, two first positioning concave surfaces 33 and two second positioning concave surfaces 34. The left and right sides of the main board 31 extend forward to form the bending arms 32. The stepped portion 12 of the insulating body 1 covers the rear end of the bending arms 32. The bending arms 32 are arranged on the left and right sides of the front base 13 of the insulating body 1 and the left and right sides of the two connecting arms 15 of the insulating body 1 through the internal space 16 of the insulating body 1. The first positioning concave surface 33 is formed at the connection between the main board 31 and the bending arms 32. The protrusion 14 of the insulating body 1 is fixed to the first positioning concave surface 33 to realize the positioning and fixing of the center piece 3 and the insulating body 1. The left and right sides of the main board 31 are respectively recessed inward to form the second positioning concave surface 34. The second positioning concave surface 34 is arranged at the front end of the first positioning concave surface 33. The clamping portion 2125 of the terminal set 2 is fixed in the second positioning concave surface 34 to achieve positioning and fixing of the center piece 3 and the terminal set 2 .

[0065] Each of the bending arms 32 is provided with a bending portion 321, an extension arm 322 and a hook 323. The bending portion 321 is bent and extended from the side edge of the main board 31. In this embodiment, the bending portion 321 is bent and extended vertically upward from the side edge of the main board 31. The front end of the bending portion 321 extends obliquely downward and then extends forward to form the extension arm 322. The front end of the extension arm 322 bends outward and then extends forward, then extends inward and then extends backward to form the hook 323. In this embodiment, the stepped portion 12 of the insulating body 1 covers the bending portion 321 and the rear end of the extension arm 322, and the rear end of the extension arm 322 is arranged in the internal space 16, that is, the rear end of the extension arm 322 is arranged between the inner surface of the side wall 123 of the stepped portion 12 and the outer surface of the connecting arm 15, the front end and the middle part of the extension arm 322 are arranged on the outer side surface of the protrusion 152 of the connecting arm 15 of the insulating body 1 and the outer side surface of the tongue 2123 of the insulator 212 of the terminal group 2, and the left and right sides of the front base 13 of the insulating body 1 respectively cover the two hooks 323 to enhance the structural strength of the electrical connector 100 of the utility model.

[0066] Each of the hooks 323 includes a first bent leg 324, a second bent leg 325 and a third bent leg 326, which can strengthen the structure of the center piece 3, thereby enhancing the structural strength of the electrical connector 100. The first bent leg 324 is formed by bending the front end of the extension arm 322 outward and then extending forward. The first bent leg 324 is arranged at the arc portion 133 of the front base 13 of the insulating body 1 to achieve the positioning and retention of the center piece 3 and the insulating body 1. The second bent leg 325 is formed by extending the front end of the first bent leg 324 forward and then bending toward the main board 31. Part of the second bent leg 325 is arranged at the positioning portion 132 of the front base 13 of the insulating body 1 to achieve the positioning and retention of the center piece 3 and the insulating body 1. The third bent leg 326 is formed by extending the free end of the second bent leg 325 toward the main board 31 and then bending toward the extension arm 322. In this embodiment, the second bent leg 325 is formed by extending the front end of the first bent leg 324 forward and then bending inward, and the third bent leg 326 is formed by extending the free end of the second bent leg 325 inward and then bending backward. The head 131 of the front base 13 of the insulating body 1 covers a portion of the second bent leg 325 and the third bent leg 326 to achieve positioning and fixing of the center piece 3 and the insulating body 1.

[0067] In this embodiment, in the front-to-back direction of the insulating body 1, the connecting arm 15 is disposed on the left and right sides between the step portion 12 and the front base portion 13. In the left-right direction of the insulating body 1, the outer side surface of the tongue portion 2123 is flush with the outer side surface of the protruding portion 152, and the bending arm 32 is disposed outside the protruding portion 152. The protruding portion 152 is disposed between the bending arm 32, the two tongue plates 2123 of the terminal set 2, and the two limiting portions 2124.

[0068] When the electrical connector 100 of the utility model is assembled, first, several terminals 211 and the insulator 212 are injection molded together to form the upper terminal group 21 and the lower terminal group 22. Then, the center piece 3 is clamped between the upper terminal group 21 and the lower terminal group 22. The receiving space 2126 is formed between the two limiting portions 2124, the tongue portion 2123 of the upper terminal group 21 and the tongue portion 2123 of the lower terminal group 22. Finally, the insulating body 1 is overmolded on the upper terminal group 21, the lower terminal group 22 and the center piece 3 by injection molding technology, so that the connecting arm 15 of the insulating body 1 is molded in the receiving space 2126. The front base 13 of the insulating body 1 is molded at the front end of the terminal group 2 and the front end of the center piece 3. The main body 11 and the stepped portion 12 of the insulating body 1 are molded at the rear end of the terminal group 2 and the rear end of the center piece 3. The step portion 12 and the front base portion 13 are integrally formed through the connecting arm 15 , thereby reducing the number of injection molding operations.

[0069] As mentioned above, the electrical connector 100 of the present invention has an innovative structural design, and the connecting arm 15 is disposed on the left and right sides between the step portion 12 and the front base portion 13, thereby increasing the structural strength of the insulating body 1. The receiving space 2126 is formed between the two limiting portions 2124, the tongue portion 2123 of the upper terminal group 21, and the tongue portion 2123 of the lower terminal group 22. The connecting arm 15 of the insulating body 1 is disposed in the receiving space 2126. The step portion 12 of the insulating body 1 covers the bending portion 321 and part of the extension arm 322, and the left and right sides of the front base portion 13 of the insulating body 1 respectively cover the two hooks 323. Therefore, the electrical connector 100 of the present invention has better structural strength.

Claims

1. An electrical connector, characterized in that: include: An insulating body, wherein the insulating body is provided with a main body, the front end of the main body extends forward to form a stepped portion, the front end of the stepped portion forms a front base, the inner side surfaces of the left and right side walls of the stepped portion respectively extend inward to form a convex block, the front surface of the convex block extends forward to form a connecting arm, the connecting arm extends out of the front end of the stepped portion, the connecting arm is connected between the convex block and the front base, and an inner space is formed between the outer side surfaces of the two connecting arms and the inner side surfaces of the left and right side walls of the stepped portion respectively; a terminal group, arranged in the insulating body, the terminal group is provided with a plurality of terminals and an insulator, the plurality of the terminals are fixedly arranged in the insulator, the left and right sides of the insulator are recessed inward to form a receiving space, and the connecting arm is arranged in the receiving space; and a center piece, provided with a main board and two bent arms extending forward from the left and right sides of the main board respectively, the main board is arranged in the insulator of the terminal group, and the bent arms are arranged in the inner space and connected to the outer side surfaces of the connecting arms.

2. The electrical connector according to claim 1, wherein: A first positioning concave surface is formed at the connection between the main board and the bending arm, and the protrusion is fixed to the first positioning concave surface. Each of the bending arms is provided with a bending portion, an extension arm and a hook. The side edge of the main board is bent vertically upward and extended to form the bending portion. The front end of the bending portion extends obliquely downward and then extends forward to form the extension arm. The front end of the extension arm is bent outward and then extends forward, and then extends inward and then extends backward to form the hook. The stepped portion covers the bending portion and the rear end of the extension arm. The front end and the middle part of the extension arm are arranged on the outer side surface of the connecting arm. The left and right sides of the front base respectively cover the two hooks, and the rear end of the extension arm is arranged in the internal space.

3. The electrical connector according to claim 2, wherein: The connecting arm is provided with a base, the base is connected to the step portion and the front base, the outer side of the base protrudes outward to form a protrusion, and the middle part of the extension arm is arranged on the outer side of the protrusion.

4. The electrical connector according to claim 3, wherein: A head, a positioning portion and an arc-shaped portion are formed on the left and right sides of the front base respectively, the rear end of the head is recessed inward to form the positioning portion, the rear end of the positioning portion is recessed inward to form the arc-shaped portion, the arc-shaped portion is arranged on the outer side of the front end of the connecting arm, a first recess is formed between the front end of the protruding portion and the base, and the first recess is arranged between the arc-shaped portion and the protruding portion.

5. The electrical connector according to claim 4, wherein: The terminal group includes an upper terminal group and a lower terminal group, wherein the upper terminal group and the lower terminal group are respectively provided with a plurality of the terminals and the insulators, the two outermost terminals in the upper terminal group are arranged above the connecting arm, and the two outermost terminals in the lower terminal group are arranged below the connecting arm.

6. The electrical connector according to claim 5, wherein: The insulator is provided with a main body, the front end of the main body extends forward to form a connecting portion, the front end of the connecting portion extends forward to form a tongue, the main body is arranged in the main body, the connecting portion is arranged in the stepped portion, the tongue is arranged between the stepped portion and the front base, the outer side surface of the tongue is flush with the outer side surface of the protruding portion, the tongue fills the first recess, and the front base covers the front end of the tongue.

7. The electrical connector according to claim 6, wherein: The left and right sides of the lower surface of the tongue of the insulator of the upper terminal group extend downward to form a limiting portion, and the left and right sides of the upper surface of the tongue of the insulator of the lower terminal group extend upward to form the limiting portion, and the lower surface of the tongue of the insulator of the upper terminal group, the upper surface of the tongue of the insulator of the lower terminal group and the outer side surfaces of the four limiting portions form the receiving space, and the connecting arm is arranged in the receiving space.

8. The electrical connector according to claim 7, wherein: The inner side surface of the limiting portion extends inward to form a clamping portion, and the left and right sides of the main board are respectively recessed inward to form a second positioning concave surface, and the second positioning concave surface is arranged at the front end of the first positioning concave surface, and the clamping portion is fixed to the second positioning concave surface.

9. The electrical connector according to claim 7, wherein: The two side surfaces of the tongue of the insulator of the upper terminal group and the two side surfaces of the tongue of the insulator of the lower terminal group are respectively recessed inward to form a second notch, the second notch is formed behind the limiting portion, and the protrusion of the insulating body is arranged in the second notch.

10. The electrical connector according to claim 4, wherein: Each of the hooks includes a first bent leg, a second bent leg and a third bent leg. The first bent leg is formed by bending the front end of the extension arm outward and then extending forward. The first bent leg is arranged in the arc portion. The second bent leg is formed by extending the front end of the first bent leg forward and then bending toward the main board. Part of the second bent leg is arranged in the positioning portion. The third bent leg is formed by extending the free end of the second bent leg inward and then bending backward. The head covers part of the second bent leg and the third bent leg.

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