A miniature radio frequency coaxial connector

Abstract

This utility model discloses a miniature radio frequency coaxial cable connector, including a plug housing and plug terminals. The plug housing includes a mating body and a shielding base plate. The mating body has a mating cavity and a riveting part. The shielding base plate is integrally connected to the mating body through a bendable connecting arm and also has a wire clamp for riveting to the outer insulating sheath of the coaxial cable. The plug terminals are fixed in the mating cavity by an insulating core and include an integrally formed elastic contact and a core wire clamping part. The core wire clamping part is electrically connected to the inner core of the coaxial cable. The contact surface of the elastic contact is exposed and can float along the mating direction. This utility model abandons the traditional two-piece metal clamp structure, simplifies the overall structure, reduces the requirements for production and assembly precision, facilitates assembly and mass production, avoids mating jamming and terminal damage, improves mating convenience and usage stability, and is suitable for radio frequency signal transmission scenarios of ultra-thin electronic devices.

Description

Technical Field

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

[0002] Radio frequency (RF) coaxial cable connectors are core components for RF signal transmission and are widely used in communication equipment, consumer electronics, automotive electronics, and other fields. Their structural rationality, ease of assembly, and overall thickness directly affect the miniaturization design and signal transmission stability of the equipment. With the rapid development of electronic devices towards ultra-thin and lightweight designs, higher requirements are being placed on the axial height of RF coaxial cable connectors.

[0003] Currently, most standard USS RF connectors in the industry employ a two-piece metal clamping structure for their plug terminals, such as patent CN107681392B. In this structure, two independent metal terminal pieces cooperate to clamp the sidewall of the connector's center pin. However, this two-piece structure requires high precision in actual production. Strict control over stamping and bending processes is necessary, ensuring not only the shape and size accuracy of the two metal pieces but also the positional accuracy between the metal pieces and the terminal body, as well as the relative positional accuracy between the two metal pieces. The cumulative dimensional and geometric tolerances of the two terminal pieces place high demands on mold precision and stamping processes, resulting in high production difficulty and cost. Furthermore, even slight deviations can lead to difficulty in assembling into the insulating core. After assembly, the two-piece clamping terminal structure is prone to cumulative positional errors or assembly gaps that cause terminal positional shifts, preventing the two metal pieces from aligning with the center pin of the connector. This results in poor terminal contact, high mating resistance, or even inability to insert, affecting the normal use of the connector. Utility Model Content

[0004] The purpose of this invention is to provide a miniature radio frequency coaxial connector that is simple in structure, requires low manufacturing precision, is easy to assemble, and can ensure connection reliability and signal transmission stability, so as to solve the problems existing in the USS RF radio frequency connector.

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

[0006] A miniature radio frequency coaxial cable 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 the coaxial cable. One end of the shielding base plate is integrally connected to the mating body via a bendable connecting arm. By bending the connecting arm, the shielding base plate covers the bottom of the mating body. The other end of the shielding base plate has a wire clamping portion 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 an integrally formed elastic contact and a core wire clamping portion. The core wire clamping portion is electrically connected to the inner core of the coaxial cable. The contact surface of the elastic contact is exposed outside the insulating core and is configured to float along the mating direction to elastically abut against the center pin of the mating connector to achieve electrical connection.

[0007] Furthermore, the insulating core includes an insulating base and a pressure cap. The insulating base has a mounting groove for mounting the elastic contact piece and a through hole for the contact surface of the elastic contact piece to pass through. The pressure cap is used to press and fix the elastic contact piece.

[0008] Furthermore, the elastic contact piece is manufactured using an integral stamping process, comprising a fixed arm, an elastic arm, and a contact arm that extend integrally from the core wire clamping portion in a direction away from the core wire.

[0009] Furthermore, the fixing arm is installed in the mounting groove, and the pressure cover covers the insulating base and presses and limits the fixing arm of the elastic contact piece; the elastic arm is bent obliquely outward of the through hole, so that the contact arm is exposed through the through hole to form a contact surface for abutting the end of the center pin of the mating connector.

[0010] Furthermore, the pressure cap portion has a limiting protrusion protruding on the side facing the contact arm, the limiting protrusion being used to limit excessive displacement of the contact arm.

[0011] Furthermore, the end of the contact arm also integrally extends to form a limiting arm, which extends and bends towards the inside of the insulating base, and its free end overlaps the mounting groove of the insulating base to form an axial limiting structure, thereby limiting the amount of the contact arm protruding from the through hole.

[0012] Furthermore, the core wire clamping part is composed of a pair of clamping pieces formed by extending and bending the ends of the fixing arm to both sides, which are used to clamp and electrically connect the inner core of the coaxial line.

[0013] Furthermore, the inner side of the riveting part is stamped with a barb structure that protrudes toward the coaxial line, and the barb structure can be embedded in the outer shielding layer of the coaxial line.

[0014] Furthermore, the shielding base plate is also integrally 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; the outermost edge of the mating end of the mating cavity is provided with a horn-shaped guide structure that expands outward along the mating direction, which is used to guide the mating operation of the miniature radio frequency 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 solution abandons the traditional two-piece metal clamp structure and adopts a one-piece molded spring-loaded plug terminal design that can float elastically along the insertion direction. This simplifies the overall structure, reduces the production precision requirements, and facilitates assembly. The plug terminal can be positioned and fixed through the mounting groove of the insulating core and the pressure cover, effectively reducing assembly requirements and assembly time, and facilitating mass production. The elastic contact can float along the insertion direction to ensure stable contact with the center pin of the mating connector, effectively avoiding mating jamming and terminal damage caused by slight deviations in the terminals. Combined with the horn-shaped guide structure of the mating end of the mating cavity, the ease of mating and the stability of use of the connector are greatly improved. 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 radio frequency coaxial connector provided in this embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the working state of a miniature radio frequency coaxial connector provided for an embodiment of this utility model;

[0021] Figure 3 A cross-sectional view of a miniature radio frequency coaxial connector provided for an embodiment of this utility model;

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

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

[0024] Figure 6This is a schematic diagram illustrating the assembly method of the plug terminals in a miniature radio frequency coaxial connector provided for an embodiment of this utility model.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1-Plug housing, 11-Molecular plug body, 111-Annular contact protrusion, 112-Guide structure, 113-Rivet part, 113a-Barb structure, 12-Shielding base plate, 121-Reinforcing riveting part, 122-Wire clamp part, 13-Connecting arm.

[0027] 2-Insulating core, 21-Insulating base, 211-Mounting groove, 212-Through hole, 22-Clipping part, 221-Limiting protrusion.

[0028] 3-Plug terminal, 31-Resilient contact piece, 311-Fixing arm, 312-Resilient arm, 313-Contact arm, 314-Limiting arm, 32-Core wire clamping part, 321-Clamping piece,

[0029] 4-Coaxial cable, 401-Inner core, 402-Outer shielding layer, 403-Outer insulating sheath.

[0030] 5-Match connector, 501-Center pin. Detailed Implementation

[0031] 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.

[0032] like Figures 1 to 6 As shown, this embodiment of the present invention provides a miniature radio frequency 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:

[0033] 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 11 and a shielding base plate 12. The plug-in body 11 has an integral cylindrical structure. The plug-in body 11 has an axially extending 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 5, ensuring coaxiality during the mating process. A riveting part 113 is provided at the end of the plug-in body 11 away from the mating opening. The riveting part 113 is integrally connected to the plug-in body 11 and is used to rivet and fix it to the outer shielding layer 402 of the coaxial cable 4, so as to realize the connection between the outer shielding layer 402 of the coaxial cable 4 and the plug housing 1. The low impedance provides stable conduction, constructing a complete and continuous RF shielding circuit to avoid RF signal leakage and external electromagnetic interference. At the same time, it provides a primary mechanical fixation for the coaxial cable 4, preventing the internal core wire connection from being affected when the cable is pulled by external forces. The riveting part 113 has a barb structure 113a protruding towards the coaxial cable 4 by stamping. This barb structure 113a 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 113 and the outer shielding layer 402, avoiding the problems of riveting loosening and shielding failure during long-term use.

[0034] The inner circumference of the mating end opening of the mating cavity is provided with an annular contact protrusion 111 that protrudes radially toward the central axis of the cavity. This annular contact protrusion 111 can form a tight, full-circumferential contact with the outer shell of the mating connector 5 after mating, ensuring low-impedance conduction between the plug shell 1 and the outer shell of the mating connector 5, 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 112 that expands radially outward along the mating direction. This guide structure 112 provides smooth guidance for the mating operation of the connector and the mating connector 5, reducing the coaxiality requirements during mating and preventing component deformation and plating damage caused by misalignment or oblique insertion.

[0035] The shielding base plate 12 is disposed at the bottom of the plug-in body 11. One end of the shielding base plate 12 is integrally connected to the plug-in body 11 via a connecting arm 13. The connecting arm 13 is bendable and, under the action of external force, drives the shielding base plate 12 to rotate around the bend line, tightly covering the bottom opening of the plug-in body 11, thereby achieving full-enclosed shielding of the bottom of the plug-in body 11 and further improving the shielding effect of high-frequency signals. The other end of the shielding base plate 12 away from the connecting arm 13 is provided with a wire clamp 122. The wire clamp 122 is integrally formed with the shielding base plate 12 and is used to connect with the coaxial line 4 after the shielding base plate 12 is closed. The outer insulating sheath 403 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 113, 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 12 is also provided with a reinforcing riveting part 121. The position of the reinforcing riveting part 121 corresponds to the position of the riveting part 113 of the plug-in body 11. It is used to perform secondary riveting and fixing of the riveting structure at the riveting part 113 after the shielding base plate 12 is closed, further improving the fastening force between the riveting part 113 and the outer shielding layer 402 of the coaxial cable 4.

[0036] The plug terminal 3 is fixedly installed in the mating cavity of the plug body 11 by an insulating core 2. The insulating core 2 includes an insulating base 21 and a coverable pressure cap 22. The insulating base 21 has a mounting groove 211 and a through hole 212. The mounting groove 211 is used to install the plug terminal 3, and the outer edge of the mounting groove 211 is chamfered to provide a guiding function to facilitate the quick insertion of the plug terminal 3. The through hole 212 is located on the mounting groove 211 and is coaxial with the mating cavity, so that the contact surface of the elastic contact piece 31 is exposed.

[0037] The plug terminal 3 is the core signal transmission component of the connector. Specifically, the plug terminal 3 is manufactured using an integral stamping process, including an integrally formed elastic contact 31 and a core wire clamping part 32. The elastic contact 31 includes a fixed arm 311, an elastic arm 312, and a contact arm 313 that extend integrally from the core wire clamping part 32 in a direction away from the core wire. The structure is simple and the production precision requirements are relatively low. The fixed arm 311 is fitted into the mounting groove 211 of the insulating base 21. After the cover 22 is placed on the insulating base 21, the shielding base plate 12 is placed on the bottom of the plug-in body 11 and riveted to the coaxial line 4. This clamps and limits the fixed arm 311, preventing the elastic contact 31 from loosening or shifting during use. The assembly process is simple and does not require high-precision alignment. The elastic arm 312 is bent obliquely outward from the through hole 212 to form an elastic support structure, allowing the contact arm 313 to be exposed through the through hole 212 at the mating end of the insulating base 21. The exposed end face of the contact arm 313 forms a contact surface for elastic abutting with the end of the center pin 501 of the mating connector 5. The elasticity of the elastic arm 312 allows the contact arm 313 to float along the insertion direction. Even if there is a slight assembly deviation in the plug terminal 3, reliable abutting with the center pin 501 of the mating connector 5 can be achieved, improving the ease of insertion and avoiding the positional offset and coaxiality deviation problems that are prone to occur in traditional terminal insertion processes.

[0038] Furthermore, the end of the contact arm 313 also integrally extends to form a limiting arm 314. The limiting arm 314 extends and bends towards the inside of the insulating base 21, and its free end overlaps the edge of the mounting groove 211 of the insulating base 21, forming an axial limiting structure. This can limit the amount of the contact arm 313 extending out of the through hole 212, and prevent the contact arm 313 from bending or being damaged due to excessive extension. The structural design is simple and does not require additional components.

[0039] The core wire clamping part 32 is composed of a pair of clamping pieces 321 formed by extending and bending the ends of the fixing arm 311 to both sides. When the inner core 401 of the coaxial cable 4 is inserted, the ends of the clamping pieces 321 bend towards each other and retract inward, clamping the inner core 401 by riveting to achieve a stable electrical connection. The bending angle of the clamping pieces 321 can be adapted according to the diameter of the inner core 401 of the coaxial cable 4, making assembly convenient.

[0040] To ensure the structural stability of the elastic contact 31 without increasing structural complexity, the pressure cap 22 has a limiting protrusion 221 protruding on the side facing the contact arm 313. The limiting protrusion 221 corresponds to the position of the contact arm 313 and is spaced apart by a certain margin. This ensures that the contact arm 313 can float up and down within a certain range while also limiting the excessive displacement of the contact arm 313. This is used to limit the excessive displacement of the contact arm 313, prevent the contact arm 313 from undergoing plastic deformation due to excessive compression during the docking process, and extend the service life of the elastic contact 31.

[0041] The overall assembly sequence of this miniature RF coaxial connector is as follows: First, the inner core 401 of the coaxial cable 4 is riveted and fixed to the core wire clamping part 32 of the plug terminal 3 to achieve electrical connection between the two, completing the riveting process between the terminal and the coaxial cable 4; next, the riveted plug terminal 3 of the coaxial cable 4 is inserted into the mounting groove 211 of the insulating base 21, so that the contact arm 313 is exposed through the through hole 212, and then the pressure cover 22 is placed on the insulating base 21 to press and fix the arm 311; then, the assembled... The main body structure is inserted into the mating cavity of the plug-in main body 11 and fixed. Then, the connecting arm 13 is bent so that the shielding base plate 12 covers the bottom of the plug-in main body 11. Finally, the outer shielding layer 402 of the coaxial line 4 is riveted and fixed to the riveting part 113 of the plug-in main body 11, and the outer insulating sleeve 403 of the coaxial line 4 is riveted and fixed to the wire clamp part 122 of the shielding base plate 12. The riveting part 113 is then reinforced by the reinforcing riveting part 121, thus completing the assembly of the entire miniature radio frequency 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 radio frequency coaxial connector, characterized in that, include: The plug housing (1) includes a plug body (11) and a shielding base plate (12). The plug body (11) has a cylindrical plug-in cavity and a riveting part (113) for riveting with the outer shielding layer (402) of the coaxial line (4). One end of the shielding base plate (12) is integrally connected to the plug body (11) through a bendable connecting arm (13). The shielding base plate (12) is covered by the bottom of the plug body (11) by bending the connecting arm (13). The other end of the shielding base plate (12) has a wire clamp part (122) for riveting and fixing with the outer insulating sheath (403) of the coaxial line (4). The plug terminal (3) is fixedly installed in the mating cavity of the plug body (11) by the insulating core (2); the plug terminal (3) includes an integrally formed elastic contact (31) and a core wire clamping part (32). The core wire clamping part (32) is electrically connected to the inner core (401) of the coaxial line (4). The contact surface of the elastic contact (31) is exposed to the insulating core (2) and can float along the plugging direction to elastically abut against the center pin (501) of the mating connector (5) to achieve electrical connection.

2. The miniature radio frequency coaxial connector according to claim 1, characterized in that: The insulating core (2) includes an insulating base (21) and a pressure cap (22). The insulating base (21) has an installation groove (211) for installing the elastic contact piece (31) and a through hole (212) for the contact surface of the elastic contact piece (31) to pass through. The pressure cap (22) is used to press and fix the elastic contact piece (31).

3. A miniature radio frequency coaxial connector according to claim 2, characterized in that: The elastic contact piece (31) is made by an integral stamping process and includes a fixed arm (311), an elastic arm (312) and a contact arm (313) that are integrally formed by extending from the core wire clamping part (32) in a direction away from the core wire.

4. A miniature radio frequency coaxial connector according to claim 3, characterized in that: The fixing arm (311) is installed in the mounting groove (211), and the pressure cover (22) covers the insulating base (21) and presses and limits the fixing arm (311) of the elastic contact (31); the elastic arm (312) is bent obliquely to the outside of the through hole (212) so that the contact arm (313) is exposed through the through hole (212) to form a contact surface for abutting the end of the center pin (501) of the mating connector (5).

5. A miniature radio frequency coaxial connector according to claim 3, characterized in that: The pressure cap (22) has a limiting protrusion (221) protruding on one side facing the contact arm (313), and the limiting protrusion (221) is used to limit the excessive displacement of the contact arm (313).

6. A miniature radio frequency coaxial connector according to claim 3, characterized in that: The end of the contact arm (313) also integrally extends to form a limiting arm (314), which extends and bends toward the inner side of the insulating base (21), and its free end overlaps the mounting groove (211) of the insulating base (21) to form an axial limiting structure, limiting the amount of the contact arm (313) protruding from the through hole (212).

7. A miniature radio frequency coaxial connector according to claim 3, characterized in that: The core wire clamping part (32) is composed of a pair of clamping pieces (321) formed by extending and bending the end of the fixing arm (311) to both sides, and is used to clamp and electrically connect the inner core (401) of the coaxial line (4).

8. A miniature radio frequency coaxial connector according to claim 1, characterized in that: The inner side of the riveting part (113) is formed by stamping with a barb structure (113a) protruding towards the coaxial line (4), and the barb structure (113a) can be embedded in the outer shielding layer (402) of the coaxial line (4).

9. A miniature radio frequency coaxial connector according to claim 1, characterized in that: The shielding base plate (12) is also integrally provided with a reinforcing riveting part (121), which is used to perform secondary riveting and fixing at the riveting part (113) after the shielding base plate (12) is closed in place.

10. A miniature radio frequency 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 (111) that protrudes toward the central axis of the cavity; the outermost edge of the mating end of the mating cavity is provided with a horn-shaped guide structure (112) that expands outward along the mating direction, which is used to provide guidance for the mating operation of the miniature radio frequency coaxial connector and the mating connector (5).

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