A miniature coaxial connector

Abstract

This utility model discloses a miniature coaxial connector, relating to the field of radio frequency connector technology. The connector includes a plug shell, an insulating core, and plug terminals. The plug shell comprises a mating body and a shielding base plate. The mating body has a mating cavity and a riveting part for riveting the outer shielding layer of the coaxial cable. The shielding base plate is integrally connected to the mating body via a bendable connecting arm, and its end has a wire clamp for fixing the coaxial cable. The plug terminals are installed in the mating cavity via the insulating core, including a center terminal and a core wire clamping part. The center terminal is coaxial with the mating cavity and exposed, used to achieve electrical connection with the mating connector. This utility model adopts a center terminal structure, with the plug terminals and insulating core integrally formed, resulting in higher overall assembly efficiency and more precise positioning. It can be adapted to new board-end connectors, provides reliable connection, is not easily deformed or collapsed, and has good impedance matching and radio frequency transmission performance.

Description

Technical Field

[0001] This utility model belongs to the field of electrical connector technology, specifically relating to a miniature coaxial connector. Background Technology

[0002] This utility model relates to the field of radio frequency coaxial connector technology, specifically a miniature coaxial connector adapted to the USS RF industry standard. With the development of consumer electronics, automotive communications, and smart terminals towards miniaturization, high frequency, and high-density integration, the USS RF series of miniature radio frequency coaxial connectors has been widely used in radio frequency signal transmission scenarios due to their advantages of small size, wide frequency band coverage, and convenient plugging and unplugging. The USS RF radio frequency connector system consists of interlocking wire-end connectors and board-end connectors. The wire-end connectors are connected to the radio frequency coaxial cable, and the board-end connectors are soldered onto the printed circuit board. The interlocking of these two components enables stable transmission of radio frequency signals between the cable and the circuit board.

[0003] Existing conventional USS RF connectors use a traditional configuration where the inner conductor at the wire end is a two-piece metal clamp structure, and the inner conductor at the board end is a cylindrical center pin. To meet the trends of thinner, lighter, and more reliable products, board-end connectors are increasingly adopting clamp-type inner conductor structures to reduce mounting height and improve structural stability during surface mounting and use. To accommodate this, wire-end connectors urgently need to adopt a center pin type inner conductor structure for mating. However, the existing traditional two-piece clamp structure is not only difficult to use with the new clamp-type board-end connectors, but also generally uses a production method of separately injection molding the core and inserting the terminals afterward. This results in cumbersome processes, low production efficiency, easy terminal misalignment, poor positional accuracy and product consistency, and negative impacts on impedance matching and RF transmission performance. Utility Model Content

[0004] The purpose of this invention is to provide a miniature coaxial connector to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A miniature coaxial connector includes: a plug housing and plug terminals. The plug housing includes a mating body and a shielding base plate. The mating body has a cylindrical mating cavity and a riveting portion for riveting with the outer shielding layer of a coaxial cable. One end of the shielding base plate is integrally connected to the mating body via a connecting arm, and the connecting arm is bendable to allow the shielding base plate to cover the bottom of the mating body. The other end of the shielding base plate is provided with a wire clamp for riveting and fixing with the outer insulating sheath of the coaxial cable. The plug terminals are fixedly installed in the mating cavity of the mating body via an insulating core. The plug terminals include a center terminal and a core wire clamping portion. The center terminal is coaxially arranged with the mating cavity, and the free end of the center terminal is exposed on the mating end face of the insulating core to form a contact. The contact is used to contact the mating connector to achieve an electrical connection. The core wire clamping portion is electrically connected to the inner core of the coaxial cable.

[0007] Furthermore, the insulating core includes an insulating base and a coverable pressure cap integrally connected to the insulating base; the plug terminal is integrally formed with the insulating core through an insert injection molding process.

[0008] Furthermore, the core wire clamping part includes a first clamping plate and a second clamping plate. The first clamping plate is partially embedded in the insulating base, and the second clamping plate is partially embedded in the pressure cover part. Both the first clamping plate and the second clamping plate are integrally connected to the center terminal.

[0009] Furthermore, the first clamping plate is integrally bent to form a U-shaped receiving surface, which is used to accommodate the inner core of the coaxial cable and to provide limiting support for the riveting and fixing of the inner core.

[0010] Furthermore, a support protrusion is provided on the side of the pressure cover facing the insulating base. When the pressure cover is closed with the insulating base, the support protrusion abuts against the bottom surface of the center terminal to support it, so as to prevent the center terminal from deforming and collapsing under the action of external force.

[0011] Furthermore, the outer edge of the insulating core is provided with a positioning protrusion, and the bottom of the cavity wall of the plug-in body is provided with a positioning groove that matches the positioning protrusion; the positioning protrusion and the positioning groove are engaged to limit and fix the insulating core and the plug-in body, ensuring the assembly positioning accuracy of the two.

[0012] Furthermore, the central terminal is a smooth, seamless cylindrical terminal structure integrally formed by stamping and stretching processes, and the outer edge of the contact of the central terminal has a rounded corner structure.

[0013] Furthermore, the riveting part is stamped with a barb structure that protrudes toward the coaxial cable side.

[0014] Furthermore, the shielding base plate is also provided with a reinforcing riveting part, which is used to perform secondary riveting and fixing at the riveting part after the shielding base plate is closed in place.

[0015] Furthermore, the inner circumference of the mating end opening of the mating cavity is provided with an annular contact protrusion that protrudes toward the central axis of the cavity to improve the contact reliability with the mating connector; the outermost edge of the mating end of the mating cavity is provided with a guide structure that expands outward along the mating direction to provide guidance for the mating operation of the miniature coaxial connector and the mating connector.

[0016] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0017] This utility model adopts a center pin type inner conductor structure, which can be adapted and mated with the new type of clamp-type board-end USS RF connector. The plug terminal and the insulating core are integrally molded by insert injection molding, which simplifies the production and assembly process, improves production efficiency, ensures the positional accuracy of the terminals and product consistency, and has higher structural strength, making it less prone to deformation, collapse and contact failure. It can be adapted to the new type of board-end connector and has good impedance matching and radio frequency transmission performance. Attached Figure Description

[0018] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0019] Figure 1 A schematic diagram of the overall structure of a miniature coaxial connector provided in an embodiment of this utility model;

[0020] Figure 2 A cross-sectional view of a miniature coaxial connector provided for an embodiment of this utility model;

[0021] Figure 3 A top view of a miniature coaxial connector provided for an embodiment of this utility model;

[0022] Figure 4 An exploded view of a miniature coaxial connector provided for an embodiment of this utility model;

[0023] Figure 5 A schematic diagram illustrating the assembly method of various components in a miniature coaxial connector provided for an embodiment of this utility model;

[0024] Figure 6 A schematic diagram of the product state after the insert injection molding of the insulating core of the plug terminal in a miniature coaxial connector is completed, as provided in this embodiment of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the plug terminal in a miniature coaxial connector provided for an embodiment of the present invention.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1-Plug housing; 101-Plug body; 101a-Annular contact protrusion; 101b-Guide structure; 101c-Positioning slot; 102-Riveting part; 102a-Barbed structure; 103-Connecting arm; 104-Shielding base plate; 104a-Reinforcing riveting part; 104b-Wire clamp part.

[0028] 2-Insulating core, 201-Insulating base, 201a-Mating end face, 202-Covering part, 203-Positioning protrusion, 204-Supporting protrusion.

[0029] 3-Plug terminal, 301-Center terminal, 301a-Rounded corner structure, 302-First clamping plate, 302a-Receiving surface, 303-Second clamping plate.

[0030] 4-Coaxial cable, 401-Inner core, 402-Outer shielding layer, 403-Outer insulating sheath.

[0031] 5 - Terminal strip, 501 - Positioning hole. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1 to 7 As shown, this embodiment of the present invention provides a miniature coaxial connector, including a plug housing 1, an insulating core 2, and plug terminals 3. The plug terminals 3 are fixedly installed inside the plug housing 1 by the insulating core 2. Specifically:

[0034] The plug housing 1 is made of stainless steel or copper alloy and is integrally formed by stamping and bending. It includes a plug-in body 101 and a shielding base plate 104. The plug-in body 101 has an integral cylindrical structure. The plug-in body 101 has an axially penetrating mating cavity inside. The mating cavity provides an installation reference for the insulating core 2 and the plug terminal 3, and also provides coaxial guidance for the mating of the connector and the mating connector, ensuring coaxiality during the mating process. A riveting part 102 is provided at the end of the plug-in body 101 away from the mating opening. The riveting part 102 is integrally connected to the plug-in body 101 and is used to rivet and fix it to the outer shielding layer 402 of the coaxial cable 4, which can realize the connection between the outer shielding layer 402 of the coaxial cable 4 and the plug housing. The low impedance and stable conduction of the 102 form a complete and continuous radio frequency shielding circuit, avoiding radio frequency signal leakage and external electromagnetic interference. At the same time, it provides a first-level mechanical fixation for the coaxial cable 4, preventing the internal core wire connection from being affected when the cable is pulled by external force. The riveting part 102 has a barb structure 102a protruding towards the coaxial cable 4 side by stamping. The barb structure 102a can be embedded in the braided structure of the outer shielding layer 402 of the coaxial cable 4 during riveting, which greatly improves the mechanical interlocking force and electrical contact stability between the riveting part 102 and the outer shielding layer 402, and avoids the problems of riveting loosening and shielding failure during long-term use.

[0035] The inner circumference of the mating end opening of the mating cavity is provided with an annular contact protrusion 101a that protrudes radially toward the central axis of the cavity. This annular contact protrusion 101a can form a tight, full-circumferential contact with the housing of the mating connector after mating, ensuring low-impedance conduction between the plug housing 1 and the mating connector housing, improving the shielding circuit, and providing a stable mating holding force to prevent contact loosening under vibration or impact. The outermost edge of the mating end of the mating cavity is provided with a flared guide structure 101b that expands radially outward along the mating direction. This guide structure 101b provides smooth guidance for the mating operation of the connector and the mating connector, reducing the coaxiality requirements during mating and preventing component deformation and plating damage caused by misalignment or oblique insertion.

[0036] The shielding base plate 104 is disposed at the bottom of the plug-in body 101. One end of the shielding base plate 104 is integrally connected to the plug-in body 101 via a connecting arm 103. The connecting arm 103 is bendable, and under the action of external force, it drives the shielding base plate 104 to rotate around the bend line, tightly covering the bottom opening of the plug-in body 101, thereby achieving full-enclosed shielding of the bottom of the plug-in body 101 and further improving the shielding effect of high-frequency signals. The other end of the shielding base plate 104 away from the connecting arm 103 is provided with a wire clamp 104b. The wire clamp 104b is integrally formed with the shielding base plate 104 and is used to coaxially connect with the shielding base plate 104 after the shielding base plate 104 is closed. The outer insulation sheath 403 of the cable 4 is riveted and fixed, providing a secondary anti-pull mechanical fixation for the coaxial cable 4. Together with the primary fixation of the riveting part 102, it forms a two-level synergistic protection, which greatly improves the anti-pull and anti-bending performance of the cable after connection. The shielding base plate 104 is also provided with a reinforcing riveting part 104a. The position of the reinforcing riveting part 104a corresponds to the position of the riveting part 102 of the plug-in body 101. It is used to perform secondary riveting and fixing of the riveting structure at the riveting part 102 after the shielding base plate 104 is closed, which further improves the fastening force between the riveting part 102 and the outer shielding layer 402 of the coaxial cable 4.

[0037] The plug terminal 3 is fixedly installed in the mating cavity of the plug body 101 by an insulating core 2. The insulating core 2 includes an integrally connected insulating base 201 and a coverable pressure cap 202. The plug terminal 3 is the core signal transmission component of the connector and is integrally formed with the insulating core 2 by an insert injection molding process. Specifically, the plug terminal 3 includes an integrally connected center terminal 301 and a core wire clamping part. The center terminal 301 is coaxially arranged with the mating cavity, and its free end is exposed on the mating end face 201a of the insulating core 2 to form a contact. The mating end face 201a is the outer surface of the insulating base 201 near the mating connector. This contact is used to make close contact with the corresponding signal terminal of the mating connector to achieve low-loss and stable transmission of radio frequency signals. The center terminal 301 is a cylindrical, smooth, seamless terminal structure integrally formed by stamping and stretching. The outer edge of the contact of the center terminal 301 is formed with a rounded corner structure 301a. The rounded corner structure 301a can provide smooth guidance during insertion, reduce insertion resistance, avoid scratching the plating of the mating terminal, and improve insertion and extraction life.

[0038] like Figure 6As shown, the core wire clamping part is used to mechanically clamp and fix the inner core 401 of the coaxial cable 4 to achieve electrical conduction. The core wire clamping part includes a first clamping plate 302 and a second clamping plate 303. The first clamping plate 302 and the second clamping plate 303 are located on both sides of the center terminal 301 and are integrally connected to the center terminal 301. The second clamping plate 303 is integrally connected to the terminal strip 5. Before injection molding, the plug terminal 3 is accurately positioned through the positioning hole 501 on the terminal strip 5 to ensure that the plug terminal 3 can be accurately placed into the preset position of the injection mold cavity of the insulating core 2. Then, the plug terminal 3 and the insulating core 2 are integrally injection molded through the insert injection molding process. After molding, the first clamping plate 302 is partially embedded in the insulating base 201 of the insulating core 2, and the second clamping plate 303 is partially embedded in the pressure cover 202 of the insulating core 2. The contact of the center terminal 301 is exposed on the mating end face 201a of the insulating core 2. After injection molding, the excess terminal strip 5 is removed. This molding method can precisely fix the plug terminal 3 within the insulating core 2 according to the preset position, coaxiality, and installation depth, avoiding the positional offset and coaxiality deviation problems that are prone to occur in traditional terminal insertion processes. At the same time, it simplifies the product assembly process, reduces intermediate turnover links, and improves the efficiency of mass production. The second clamping plate 303 is embedded in the cover part 202 and can move synchronously with the bending of the cover part 202. When the cover part 202 covers the insulating base 201, it can simultaneously drive the second clamping plate 303 to smoothly close to the first clamping plate 302, thereby forming a uniform and stable clamping and riveting pressure on the inner core 401 of the coaxial cable 4 placed between the first clamping plate 302 and the second clamping plate 303, realizing reliable mechanical fixation and low impedance electrical conduction of the inner core 401. Furthermore, the first clamping plate 302 is integrally bent to form a U-shaped receiving surface 302a. The opening of the receiving surface 302a faces the second clamping plate 303 and is used to accommodate the inner core 401 of the coaxial cable 4. It provides circumferential limiting support for the riveting and fixing of the inner core 401, avoids the problem of radial displacement of the inner core 401 during the riveting process, and effectively increases the contact area between the clamping plate and the inner core 401, improves the clamping and fastening force and electrical contact stability after riveting, and reduces the contact resistance.

[0039] In a preferred embodiment, the pressure cover 202 is further provided with a support protrusion 204 on the side facing the insulating base 201. When the pressure cover 202 and the insulating base 201 are in place, the top of the support protrusion 204 can tightly abut against the bottom surface of the center terminal 301, providing reverse rigid support for the center terminal 301. This greatly offsets the axial pressure applied to the center terminal 301 by the mating connector during the mating process, preventing the center terminal 301 from deforming and collapsing during repeated insertion and removal and high-force insertion, and significantly improving the structural reliability and mating life of the connector.

[0040] To further ensure the mating accuracy and contact reliability of the connector, the outer edge of the insulating core 2 is provided with a positioning protrusion 203. The bottom of the cavity wall of the insertion body 101 is provided with a positioning slot 101c that corresponds one-to-one with the positioning protrusion 203 and is sized to fit the positioning protrusion 203. After the insulating core 2 is inserted into the insertion cavity along the axial direction, the positioning protrusion 203 is precisely engaged in the positioning slot 101c to form a mating engagement, thereby realizing the circumferential and axial dual limiting and fixing of the insulating core 2 and the insertion body 101. This reliably restricts the circumferential rotation and axial movement of the insulating core 2 in the insertion cavity, ensuring the assembly positioning accuracy of the two, and thus ensuring the coaxiality of the center terminal 301 and the insertion cavity.

[0041] The overall assembly sequence of this miniature coaxial connector is as follows: First, the plug terminal 3 is formed into an integral structure through precision stamping and stretching. The formed plug terminal 3 is then placed into an injection mold as an insert and integrally formed with the insulating core 2 through an insert injection molding process. Next, the integrally formed plug terminal 3 and insulating core 2 assembly is axially assembled into the mating cavity of the plug housing 1's insertion body 101. The positioning protrusion 203 on the outer edge of the insulating core 2 and the positioning slot 101 on the insertion body 101 are then aligned. After the c-clamp is completed and the limiting and fixing are completed, the pre-processed coaxial cable 4 is installed accordingly, so that the inner core 401 of the coaxial cable 4 is placed inside the receiving surface 302a of the core wire clamping part, and the outer shielding layer 402 is correspondingly attached to the riveting part 102 of the plug-in body 101. Finally, the connecting arm 103 is bent so that the shielding base plate 104 covers the bottom of the plug-in body 101. The core wire clamping part, the riveting part 102, and the wire clamping part 104b are riveted and fixed in sequence, thus completing the assembly of the entire miniature coaxial connector.

[0042] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A miniature coaxial connector, characterized in that, include: The plug housing (1) includes a plug body (101) and a shielding base plate (104). The plug body (101) has a cylindrical plug cavity and a riveting part (102) for riveting with the outer shielding layer (402) of the coaxial cable (4). One end of the shielding base plate (104) is integrally connected to the plug body (101) through a connecting arm (103), and the connecting arm (103) is bendable to drive the shielding base plate (104) to cover the bottom of the plug body (101). The other end of the shielding base plate (104) is provided with a wire clamp part (104b) for riveting and fixing with the outer insulating sheath (403) of the coaxial cable (4). The plug terminal (3) is fixedly installed in the mating cavity of the plug body (101) by the insulating core (2). The plug terminal (3) includes a center terminal (301) and a core wire clamping part. The center terminal (301) is coaxially arranged with the mating cavity, and the free end of the center terminal (301) is exposed on the mating end face (201a) of the insulating core (2) to form a contact. The contact is used to contact the mating connector to achieve electrical connection. The core wire clamping part is electrically connected to the inner core (401) of the coaxial cable (4).

2. A miniature coaxial connector according to claim 1, characterized in that: The insulating core (2) includes an insulating base (201) and a coverable pressure part (202) integrally connected to the insulating base (201); the plug terminal (3) is integrally formed with the insulating core (2) by insert injection molding process.

3. A miniature coaxial connector according to claim 2, characterized in that: The core wire clamping part includes a first clamping plate (302) and a second clamping plate (303). The first clamping plate (302) is partially embedded in the insulating base (201), and the second clamping plate (303) is partially embedded in the pressure cover part (202). Both the first clamping plate (302) and the second clamping plate (303) are integrally connected to the center terminal (301).

4. A miniature coaxial connector according to claim 3, characterized in that: The first clamp (302) is integrally bent to form a U-shaped receiving surface (302a). The receiving surface (302a) is used to accommodate the inner core (401) of the coaxial cable (4) and to provide limiting support for the riveting and fixing of the inner core (401).

5. A miniature coaxial connector according to claim 2, characterized in that: The cover portion (202) has a supporting protrusion (204) protruding on the side facing the insulating base (201). When the cover portion (202) and the insulating base (201) are in place, the supporting protrusion (204) abuts against the bottom surface of the center terminal (301) to prevent the center terminal (301) from deforming and collapsing under external force.

6. A miniature coaxial connector according to claim 1, characterized in that: The outer edge of the insulating core (2) is provided with a positioning protrusion (203), and the bottom of the cavity wall of the plug-in body (101) is provided with a positioning slot (101c) that is adapted to the positioning protrusion (203); the positioning protrusion (203) and the positioning slot (101c) are engaged to realize the limiting and fixing of the insulating core (2) and the plug-in body (101), and ensure the assembly positioning accuracy of the two.

7. A miniature coaxial connector according to claim 1, characterized in that: The center terminal (301) is a cylindrical smooth seamless terminal structure integrally formed by stamping and stretching process, and the outer edge of the contact of the center terminal (301) has a rounded corner structure (301a).

8. A miniature coaxial connector according to claim 1, characterized in that: The riveting part (102) has a barb structure (102a) that protrudes toward the coaxial cable (4) by stamping.

9. A miniature coaxial connector according to claim 1, characterized in that: The shielding base plate (104) is also provided with a reinforcing riveting part (104a), which is used to perform secondary riveting and fixing on the riveting part (102) after the shielding base plate (104) is closed in place.

10. A miniature coaxial connector according to claim 1, characterized in that: The inner circumference of the mating end opening of the mating cavity is provided with an annular contact protrusion (101a) that protrudes toward the central axis of the cavity to improve the contact reliability with the mating connector; the outermost edge of the mating end of the mating cavity is provided with a guide structure (101b) that expands outward along the mating direction to provide guidance for the mating operation of the miniature coaxial connector and the mating connector.

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