Jack inner core, jack terminal and charging socket

Abstract

The utility model provides a jack inner core, a jack terminal and a charging socket, and belongs to the field of connecting devices. The jack inner core comprises a cylindrical body, elastic cantilevers are arranged at the rear end of the cylindrical body at intervals in the circumferential direction, each elastic cantilever is of a circumferentially-bent segment-shaped structure, the elastic cantilevers are formed by being separated from the cylindrical body, and separation holes are formed after the cylindrical body is separated from the elastic cantilevers. A gap between the side wall face of the separation hole and the side wall face of the elastic cantilever is a separation machining gap. The jack terminal comprises the jack inner core. The charging socket comprises the above jack terminal. According to the utility model, the reinforcing bulge is additionally arranged at the connection position of the elastic cantilever and the cylindrical body, so that the deformation resistance of the elastic cantilever in the radial direction is improved, the hole terminal and the connection hole are matched more tightly, and the situation that the jack terminal and the side wall of the connection hole of the circuit board are in poor contact is prevented.

Description

Technical Field

[0001] This utility model belongs to the field of connecting devices, and in particular relates to a socket inner core, socket terminal and charging socket. Background Technology

[0002] When charging a new energy vehicle, the charging gun needs to be plugged into the charging socket on the vehicle. At this time, the power supply circuit between the charging gun and the charging socket is connected, and the signal transmission circuit is also connected.

[0003] The socket terminals used for signal transmission in charging sockets are generally manufactured by machining. The rear end of the socket terminal needs to be connected to the circuit board. Specifically, the connection method is to install torsion spring holes on the circuit board, so that the rear end of the socket terminal can be inserted and mated with the torsion spring holes. However, machined socket terminals have low processing efficiency and high processing cost; torsion spring holes have high assembly precision requirements, low assembly fault tolerance, and are also expensive.

[0004] To address the aforementioned technical issues, Chinese utility model patent CN222422392U discloses an electrical connection structure for a charging socket and a charging socket itself. The electrical connection structure includes a circuit board and cylindrical terminals (i.e., socket terminals). The cylindrical terminal comprises a rolled cylindrical body and multiple circumferentially spaced elastic cantilever arms located at the rear end of the cylindrical body. Each elastic cantilever arm has a contact portion protruding from the outer surface of the cylindrical body, which is interference-fitted with a connection hole on the circuit board. The rolled socket terminal offers higher processing efficiency and lower processing costs. The elastic cantilever arms are integrally formed onto the cylindrical body through stamping, resulting in lower costs and greater tolerance during assembly, reducing the requirements for assembly precision.

[0005] The diameter of the circle containing the contact part on each elastic cantilever is larger than the diameter of the connecting hole on the circuit board. During the assembly process, each elastic cantilever will undergo radial inward elastic deformation under the pressure of the hole wall of the connecting hole. After assembly, the contact part on the elastic cantilever will press against the hole wall of the connecting hole under the action of elastic force.

[0006] Currently, existing flexible cantilever designs typically involve shaping the material before the cylindrical body of the socket terminal is rolled—that is, while the raw material is still flat. This is done by cutting away U-shaped material from the cylindrical body to form the flexible cantilever, followed by rolling the material into a cylindrical shape. The resulting flexible cantilever is a long, flat structure with low stiffness and minimal rebound force after deformation. Furthermore, a large space is left between the flexible cantilever and the hole created during its formation on the cylindrical body. This space is used to machine curved transition edges on both sides of the junction between the flexible cantilever and the cylindrical body to prevent stress concentration. This process narrows the width of the flexible cantilever due to the removal of a significant amount of material, further contributing to its low stiffness and weak rebound force after deformation. The weak rebound force of the flexible cantilever leads to a loose fit between the socket terminal and the connection hole on the circuit board. During use, this can easily result in poor contact between the socket terminal and the sidewall of the connection hole on the circuit board, severely affecting the normal operation of the charging socket. Utility Model Content

[0007] One of the objectives of this utility model is to provide a socket inner core to solve the technical problem in the prior art where poor contact between the socket terminal and the circuit board is easily caused by a loose fit between the two.

[0008] Another objective of this utility model is to provide a socket terminal to solve the above-mentioned technical problems;

[0009] Another objective of this invention is to provide a charging socket to solve the aforementioned technical problems.

[0010] To achieve the above objectives, the technical solution for the socket inner core provided by this utility model is as follows:

[0011] A socket core includes a cylindrical body with its front and rear ends at its axial ends. Elastic cantilever arms are spaced at intervals along the circumferential direction at the rear end of the cylindrical body. Each elastic cantilever arm extends axially along the cylindrical body and has a contact portion protruding from the outer surface of the cylindrical body for abutting against the wall of a connection hole on a circuit board. The elastic cantilever arm is a circumferentially curved tubular structure. The curvature of the outer surface of the elastic cantilever arm is less than or equal to the curvature of the outer surface of the cylindrical body. The elastic cantilever arm is separated from the cylindrical body, forming a separation hole after separation. The gap between the sidewall of the separation hole and the sidewall of the elastic cantilever arm is the separation processing gap.

[0012] As a further improvement, the elastic cantilever has a trapezoidal structure, and the width at the junction of the elastic cantilever and the cylindrical body is greater than the width of the cantilever end of the elastic cantilever.

[0013] As a further improvement, an integrated reinforcing bulge is provided at the junction of the elastic cantilever and the cylindrical body, with part of the reinforcing bulge located on the elastic cantilever and the other part located on the cylindrical body.

[0014] As a further improvement, the bulge is reinforced to protrude from the outer surface of the elastic cantilever and the cylindrical body.

[0015] As a further improvement, the bulge is reinforced with a semi-ellipsoidal structure.

[0016] As a further improvement, the long axis of the bulge is reinforced to face the direction of the elastic cantilever.

[0017] As a further improvement, the highest point of the bulge is reinforced at the junction of the elastic cantilever and the cylindrical body.

[0018] As a further improvement, the bulge is reinforced at the middle position of the junction of the elastic cantilever and the cylindrical body.

[0019] The beneficial effects are as follows: The socket core provided by this utility model is an improvement over the prior art. In this utility model, the elastic cantilever is designed as a tubular structure, which enhances its resistance to bending deformation in the radial direction. Therefore, after the socket terminal is inserted and assembled with the corresponding connection hole on the circuit board, the elastic cantilever exerts a greater clamping force on the hole wall, meaning the socket terminal can achieve a tighter fit with the connection hole, preventing poor contact between the socket terminal and the side wall of the connection hole on the circuit board. The elastic cantilever is formed separately from the cylindrical body, naturally resulting in a tubular elastic cantilever after separation. This eliminates the need for separate stamping and bending of the elastic cantilever to form a tubular shape. Furthermore, this method results in a smaller gap between the side wall of the separation hole and the side wall of the elastic cantilever. Compared to the prior art where the elastic cantilever is formed by cutting off a U-shaped piece of material, this method fully utilizes space, increases the width of the elastic cantilever, and thus achieves higher elasticity.

[0020] To achieve the above objectives, the technical solution for the socket terminal provided by this utility model is as follows:

[0021] A socket terminal includes a socket core and a sheath installed at the front end of the socket core. The socket core includes a cylindrical body with its front and rear ends at its axial ends, respectively. Elastic cantilever arms are provided at intervals along the circumferential direction at the rear end of the cylindrical body. The elastic cantilever arms extend along the axial direction of the cylindrical body and have contact portions protruding from the outer surface of the cylindrical body for abutting against the wall of a connection hole on a circuit board. The elastic cantilever arms are circumferentially curved tubular structures. The curvature of the outer surface of the elastic cantilever arms is less than or equal to the curvature of the outer surface of the cylindrical body. The elastic cantilever arms are separated from the cylindrical body and formed. After the cylindrical body is separated from the elastic cantilever arms, a separation hole is formed. The gap between the side wall of the separation hole and the side wall of the elastic cantilever arms is the separation processing gap.

[0022] As a further improvement, the elastic cantilever has a trapezoidal structure, and the width at the junction of the elastic cantilever and the cylindrical body is greater than the width of the cantilever end of the elastic cantilever.

[0023] As a further improvement, an integrated reinforcing bulge is provided at the junction of the elastic cantilever and the cylindrical body, with part of the reinforcing bulge located on the elastic cantilever and the other part located on the cylindrical body.

[0024] As a further improvement, the bulge is reinforced to protrude from the outer surface of the elastic cantilever and the cylindrical body.

[0025] As a further improvement, the bulge is reinforced with a semi-ellipsoidal structure.

[0026] As a further improvement, the long axis of the bulge is reinforced to face the direction of the elastic cantilever.

[0027] As a further improvement, the highest point of the bulge is reinforced at the junction of the elastic cantilever and the cylindrical body.

[0028] As a further improvement, the bulge is reinforced at the middle position of the junction of the elastic cantilever and the cylindrical body.

[0029] The beneficial effects are as follows: The socket terminal provided by this utility model is an improvement on the prior art. In this utility model, the elastic cantilever is designed as a tubular structure, which enhances its resistance to bending deformation in the radial direction. Therefore, after the socket terminal is inserted and assembled with the corresponding connection hole on the circuit board, the elastic cantilever exerts a greater clamping force on the hole wall, meaning the socket terminal can achieve a tighter fit with the connection hole, preventing poor contact between the socket terminal and the side wall of the connection hole on the circuit board. The elastic cantilever is formed separately from the cylindrical body, naturally resulting in a tubular elastic cantilever after separation. This eliminates the need for separate stamping and bending of the elastic cantilever to form a tubular shape. Furthermore, this method results in a smaller gap between the side wall of the separation hole and the side wall of the elastic cantilever. Compared to the prior art where the elastic cantilever is formed by cutting off a U-shaped piece of material, this method fully utilizes space, increases the width of the elastic cantilever, and thus provides higher elasticity.

[0030] To achieve the above objectives, the technical solution for the charging socket provided by this utility model is as follows:

[0031] A charging socket includes a housing and a socket terminal assembled within the housing. The socket terminal includes a socket core and a sheath installed at the front end of the socket core. The socket core includes a cylindrical body with its front and rear ends at its axial ends, respectively. Elastic cantilever arms are spaced apart along the circumferential direction at the rear end of the cylindrical body. The elastic cantilever arms extend along the axial direction of the cylindrical body and have contact portions protruding from the outer surface of the cylindrical body for abutting against the wall of a connection hole on a circuit board. The elastic cantilever arms are circumferentially curved tubular structures. The curvature of the outer surface of the elastic cantilever arms is less than or equal to the curvature of the outer surface of the cylindrical body. The elastic cantilever arms are separated from the cylindrical body and a separation hole is formed after the cylindrical body is separated from the elastic cantilever arms. The gap between the side wall of the separation hole and the side wall of the elastic cantilever arms is the separation processing gap.

[0032] As a further improvement, the elastic cantilever has a trapezoidal structure, and the width at the junction of the elastic cantilever and the cylindrical body is greater than the width of the cantilever end of the elastic cantilever.

[0033] As a further improvement, an integrated reinforcing bulge is provided at the junction of the elastic cantilever and the cylindrical body, with part of the reinforcing bulge located on the elastic cantilever and the other part located on the cylindrical body.

[0034] As a further improvement, the bulge is reinforced to protrude from the outer surface of the elastic cantilever and the cylindrical body.

[0035] As a further improvement, the bulge is reinforced with a semi-ellipsoidal structure.

[0036] As a further improvement, the long axis of the bulge is reinforced to face the direction of the elastic cantilever.

[0037] As a further improvement, the highest point of the bulge is reinforced at the junction of the elastic cantilever and the cylindrical body.

[0038] As a further improvement, the bulge is reinforced at the middle position of the junction of the elastic cantilever and the cylindrical body.

[0039] The beneficial effects are as follows: The charging socket provided by this utility model is an improvement on the prior art. In this utility model, the elastic cantilever is designed as a tubular structure, which enhances its resistance to bending deformation in the radial direction. Therefore, after the socket terminal is inserted and assembled with the corresponding connection hole on the circuit board, the elastic cantilever exerts a greater clamping force on the hole wall, meaning the socket terminal can achieve a tighter fit with the connection hole, preventing poor contact between the socket terminal and the side wall of the connection hole on the circuit board. The elastic cantilever is formed separately from the cylindrical body, naturally resulting in a tubular elastic cantilever after separation. This eliminates the need for separate stamping and bending of the elastic cantilever to form a tubular shape. Furthermore, this method results in a smaller gap between the side wall of the separation hole and the side wall of the elastic cantilever. Compared to the prior art where the elastic cantilever is formed by cutting off a U-shaped piece of material, this method fully utilizes space, increases the width of the elastic cantilever, and thus provides greater elasticity. Attached Figure Description

[0040] Figure 1 This is an exploded view of Embodiment 1 of the charging socket in this utility model;

[0041] Figure 2 This is a schematic diagram of the socket terminal structure in Embodiment 1 of the charging socket of this utility model.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Housing; 2. Circuit board; 21. Connecting hole; 3. Socket terminal; 301. Cylindrical body; 302. Sheath; 303. Fixing hole; 304. Fixing piece; 305. Contact spring; 306. Support spring; 307. Guide spring; 308. Positioning claw; 309. Anti-misoperation key; 310. Sealing ring; 311. Elastic cantilever; 312. Contact part; 313. Reinforcing bulge; 314. Separation hole. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the embodiments.

[0045] To address the problems in the prior art, the basic concept of this utility model is to improve the radial deformation resistance of the elastic cantilever by setting the elastic cantilever in a tubular structure and forming it separately from the cylindrical body, thereby achieving a tighter fit between the hole terminal and the connection hole and preventing poor contact between the insertion terminal and the side wall of the connection hole of the circuit board.

[0046] Specific embodiment 1 of the charging socket provided by this utility model:

[0047] See appendix Figure 1The charging socket includes a housing 1, a circuit board 2, and a socket terminal 3. The socket terminal 3 is assembled inside the housing 1, and its rear end is assembled with the circuit board 2. In this invention, the end of the socket terminal 3 that is inserted into the housing 1 and used to engage with the pin terminal on the charging gun is the front end, and the end of the socket terminal 3 used to connect with the circuit board 2 is the rear end.

[0048] See appendix Figure 2 The socket terminal 3 includes a socket inner core and a sheath 302, both of which are manufactured by rolling and stamping. The sheath 302 is assembled on the outer front end of the socket inner core. The socket inner core is provided with a fixing hole 303, and the sheath 302 is provided with a fixing piece 304 at a corresponding position, which can extend into the fixing hole 303 and fix the sheath 302 to the socket inner core by bending. The fixing piece 304 can be used to fix the sheath 302 and the socket inner core into a whole socket terminal 3.

[0049] The inner core of the socket includes a cylindrical body 301. Multiple circumferentially distributed and axially extending contact springs 305 are provided at the front end of the cylindrical body 301. The front ends of the contact springs 305 are bent inwards, causing the opening of the inner core of the socket to narrow. After the pin terminal is inserted into the inner core of the socket, the inner core of the socket can have an interference fit with the pin terminal, thereby ensuring good conductive contact. The sheath 302 is provided with support springs 306 corresponding to the contact springs 305. The support springs 306 also extend axially, and their front ends press inwards against the radially outer side of the contact springs 305, thereby providing radial support force to the contact springs 305 and ensuring good insertion stability after the pin terminal and the socket terminal 3 are inserted.

[0050] The front end of the sheath 302 is also provided with an inwardly bent guide spring 307. During the insertion of the pin terminal, the guide spring 307 can guide the pin terminal to approach the center of the inner core of the socket, so as to avoid the pin terminal colliding with the front end of the contact spring 305.

[0051] The sheath 302 is also provided with an axially extending positioning claw 308, the end of which faces rearward, giving it a barbed structure. After the socket terminal 3 is inserted into the housing 1 of the charging socket, the positioning claw 308 can engage with the stepped surface in the housing 1, thereby preventing the socket terminal 3 from retracting. The sheath 302 is provided with a radially protruding anti-misalignment key 309, which can engage with the anti-misalignment groove on the housing 1, thereby ensuring that the socket terminal 3 can be positioned circumferentially when assembled into the housing 1.

[0052] A sealing ring 310 is provided on the cylindrical body 301 by vulcanization molding. After the socket terminal 3 is installed into the housing 1, the sealing ring 310 can seal with the corresponding hole sidewall on the housing 1.

[0053] Four elastic cantilever arms 311 are provided at circumferential intervals at the rear end of the cylindrical body 301. Each elastic cantilever arm 311 extends along the axial direction of the cylindrical body 301, and the free end of the elastic cantilever arm 311 faces forward. A contact portion 312 is provided on the elastic cantilever arm 311, which protrudes from the outer surface of the cylindrical body 301 and is used to abut against the wall of the connecting hole 21. The contact portion 312 is formed by bending the elastic cantilever arm 311.

[0054] The circuit board 2 is located behind the housing 1 and has connection holes 21 that correspond one-to-one with the plug terminals 3. The sidewalls of the connection holes 21 are tin-plated and copper-plated. After the rear end of the plug terminal 3 is inserted into the corresponding connection hole 21, the contact part 312 will abut against the sidewall of the connection hole 21, thereby making the plug terminal 3 and the circuit board 2 conductive.

[0055] All elastic cantilever arms 311 are circumferentially curved tubular structures, and the curvature of the outer surface of the elastic cantilever arm 311 is consistent with the curvature of the outer surface of the cylindrical body. The elastic cantilever arm 311 is separated from the cylindrical body 301 by means of tearing, wire cutting, or laser cutting. Before separation, the cylindrical body 301 has been rolled, so the elastic cantilever arm 311 after separation is a tubular structure. After separating the elastic cantilever arm 311 from the cylindrical body 301, a separation hole 314 is formed. The side of the separation hole 314 avoids forming a separation processing gap with the side wall of the elastic cantilever arm 311, rather than a large space specifically reserved for processing the arc transition edge.

[0056] Compared with the prior art, the present invention sets the elastic cantilever 311 into a tubular structure, which can enhance the strength of the elastic cantilever 311 and make it less prone to bending and deformation in the radial direction. After the plug terminal 3 is plugged into the corresponding connection hole 21 on the circuit board 2, the elastic cantilever 311 has a greater pressing force against the hole wall of the connection hole 21, which can effectively prevent the phenomenon of poor contact between the plug terminal 3 and the side wall of the connection hole 21 of the circuit board 2.

[0057] The elastic cantilever 311 is manufactured by separation molding. On the one hand, the elastic cantilever 311 can be separated after the cylindrical body 301 is rolled, so that the elastic cantilever 311 naturally and directly takes the shape of a tube sheet, without the need for additional stamping processing. On the other hand, space can be fully utilized to make the width of the elastic cantilever 311 as wide as possible, which is conducive to enhancing the elasticity of the elastic cantilever 311.

[0058] However, compared with the prior art, the tube-shaped structure enhances the strength of the elastic cantilever 311. The elastic cantilever 311 itself is not easily deformed, so the deformation will be concentrated at the junction of the elastic cantilever 311 and the cylindrical body 301, resulting in stress concentration at this point. In addition, in this utility model, there is no longer a large space between the side wall of the elastic cantilever 311 and the side wall of the separation hole 314, so the arc transition edges are no longer provided on both sides of the junction, resulting in a more serious stress concentration at the junction.

[0059] To address the aforementioned problems, this invention provides an integrated reinforcing bulge 313 at the connection between each elastic cantilever 311 and the cylindrical body 301. The reinforcing bulge 313 protrudes radially from the outer surface of the elastic cantilever 311 and the cylindrical body 301, with a portion of the reinforcing bulge 313 located on the elastic cantilever 311 and another portion on the cylindrical body 301. The integrated reinforcing bulge 313 is a single, unbent structure, providing better reinforcement and support.

[0060] The reinforcing bulge 313 is located at the middle of the connection between each elastic cantilever 311 and the cylindrical body 301, so that the elastic cantilever 311 deforms evenly when subjected to force. The highest point of the reinforcing bulge 313 is located at the joint boundary between the elastic cantilever 311 and the cylindrical body 301, so that the joint boundary is reinforced to the greatest extent.

[0061] The reinforcing bulge 313 is a bulge-shaped structure formed by stamping, therefore, no additional material is needed to install the reinforcing bulge 313, which is convenient for processing and manufacturing. The reinforcing bulge 313 has a semi-ellipsoidal structure, and the long axis of the reinforcing bulge is oriented towards the direction of the elastic cantilever. The semi-ellipsoidal structure of the reinforcing bulge 313 is not only easy to process, but also less prone to bending deformation, resulting in better reinforcement. In addition, the outer surface of the reinforcing bulge 313 can also guide the insertion of the socket terminal 3 into the connection hole 21 on the circuit board 2, preventing the circuit board 2 from being jammed by the reinforcing bulge 313.

[0062] After the reinforcement bulge 313 is set, the strength and bending resistance at the joint of the elastic cantilever 311 and the cylindrical body 301 are enhanced. On the one hand, it can reduce the degree of bending at this point during use, so that the bending deformation is distributed throughout the elastic cantilever 311, thus making it less likely for the elastic cantilever 311 to break from its root position. On the other hand, it can further increase the clamping force between the elastic cantilever 311 and the hole wall of the connecting hole 21 during the assembly process, improve the holding force of the plug terminal 3 relative to the circuit board 2 after assembly, prevent poor contact between the plug terminal 3 and the circuit board 2 during use, and improve the reliability of the charging socket.

[0063] In this embodiment, the elastic cantilever 311 has a trapezoidal structure, and the width at the junction of the elastic cantilever 311 and the cylindrical body 301 is greater than the width of the cantilever end of the elastic cantilever 311. This allows the strength of the elastic cantilever 311 to gradually decrease from its root to its end, and also further avoids stress concentration at the junction of the elastic cantilever 311 and the cylindrical body 301.

[0064] Specific embodiment 2 of the charging socket provided by this utility model:

[0065] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the elastic cantilever in this embodiment has a structure of equal width.

[0066] Specific embodiment 3 of the charging socket provided by this utility model:

[0067] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that no reinforcing bulge is provided at the junction of the elastic cantilever and the cylindrical body. The trapezoidal structure of the elastic cantilever is used to avoid stress concentration at the root of the elastic cantilever.

[0068] Specific embodiment 4 of the charging socket provided by this utility model:

[0069] This embodiment is based on Embodiment 1, but differs in that the reinforcing bulge in this embodiment is a rectangular structure. In other embodiments of this embodiment, the reinforcing bulge may also be a hemispherical structure.

[0070] Specific embodiment 5 of the charging socket provided by this utility model:

[0071] This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that the short axis of the reinforcing bulge in this embodiment is oriented towards the elastic cantilever.

[0072] Specific embodiment 6 of the charging socket provided by this utility model:

[0073] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the highest point of the reinforced bulge is no longer at the junction of the elastic cantilever and the cylindrical body, but is located on the elastic cantilever.

[0074] Specific embodiment 7 of the charging socket provided by this utility model:

[0075] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the outer surface curvature of the elastic cantilever is less than that of the outer surface curvature of the cylindrical body. This can make the elastic cantilever have higher rigidity, and after assembly, it can further increase the clamping force between the elastic cantilever and the hole wall of the connecting hole, thereby improving the holding force of the plug terminal relative to the circuit board after assembly.

[0076] Specific embodiments of the socket terminal provided by this utility model:

[0077] The socket terminal is the socket terminal in the specific embodiment of the charging socket described above, and will not be described again.

[0078] Specific embodiments of the socket inner core provided by this utility model:

[0079] The inner core of the socket is the same as the inner core of the socket in the specific embodiment of the charging socket described above, and will not be described again.

[0080] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A jack inner core, comprising a cylindrical body, the front end and the rear end of the cylindrical body are respectively located at the axial two ends of the cylindrical body, the rear end of the cylindrical body is provided with elastic cantilever arms (311) in the circumferential direction, the elastic cantilever arms (311) extend along the axial direction of the cylindrical body, and the elastic cantilever arms (311) are provided with contact portions protruding from the outer surface of the cylindrical body and used for abutting contact with the hole wall of a connecting hole on a circuit board, characterized in that, The elastic cantilever (311) is a circumferentially curved tubular sheet structure, the outer surface curvature of the elastic cantilever (311) is less than or equal to the outer surface curvature of the cylindrical body, the elastic cantilever (311) is formed separately from the cylindrical body, the cylindrical body forms a separation hole (314) after the elastic cantilever (311) is separated, and a gap between a side wall surface of the separation hole (314) and a side wall surface of the elastic cantilever (311) is a separation processing gap.

2. The jack insert core of claim 1 wherein, The elastic cantilever (311) is a trapezoidal structure, and the width of the joint of the elastic cantilever (311) and the cylindrical body is greater than the width of the overhanging end of the elastic cantilever (311).

3. A jack inner according to claim 1 or 2, characterised in that, The joint of the elastic cantilever (311) and the cylindrical body is provided with an integrated reinforcing bulge (313), and a part of the reinforcing bulge (313) is located on the elastic cantilever (311) and the other part is located on the cylindrical body.

4. The jack insert core of claim 3 wherein, The reinforcing bulge (313) protrudes from the outer side surface of the elastic cantilever (311) and the cylindrical body.

5. The jack insert core of claim 3 wherein, The reinforcing bulge (313) is a semi-ellipsoidal structure.

6. The jack insert core of claim 5 wherein, The long axis of the reinforcing bulge (313) is directed towards the direction of the elastic cantilever (311).

7. The jack inner core of claim 3 wherein, The highest point of the reinforcing bulge (313) is located at the joint boundary of the elastic cantilever (311) and the cylindrical body.

8. The jack inner core of claim 3 wherein, The reinforcing bulge (313) is located at the middle position of the joint of the elastic cantilever (311) and the cylindrical body.

9. A jack terminal comprising a jack inner core and a boot (302) mounted at a front end of the jack inner core, characterized by, The jack inner core is the jack inner core according to any one of claims 1-8.

10. A charging socket comprising a housing (1), characterized in that Also included is the jack terminal according to claim 9 assembled in the shell (1). Also included is the jack terminal according to claim 9 assembled in the shell (1).

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