Shielded conductive pre-assembled assembly and FAKRA board end connector including same

Abstract

The invention relates to the technical field of electric connector manufacturing, in particular to a shielding conductive pre-assembly assembly and a FAKRA board end connector comprising the same. For the shielding conductive pre-assembly component, the signal terminal penetrates through the insulating plastic part and is fixed with the insulating plastic part, and the signal terminal and the insulating plastic part are jointly embedded in the electromagnetic shielding metal part; and the electromagnetic shielding metal piece and the cavity type mounting positioning piece are assembled and enclosed to form a closed protection space. The signal terminal is sequentially provided with a guide positioning characteristic section, a pre-insertion anti-interference avoiding section, an elastic contact section, an anti-bending strengthening section and an insertion matching section along the length direction of the signal terminal, so as to respectively realize the functions of alignment, interference prevention, stable connection, strength strengthening and matching with an insulating plastic part. Therefore, on one hand, due to the arrangement of the press-fit elastic hole, the deformation space of the signal terminal is expanded, and the contact retention force between the signal terminal and the PCB is further improved; on the other hand, efficient electromagnetic shielding of the signal terminal is achieved through the closed protection space, and external electromagnetic interference can be effectively isolated.

Description

Technical Field

[0001] This invention relates to the field of electrical connector manufacturing technology, and in particular to a shielded conductive pre-assembled assembly and a FAKRA board-end connector including the same. Background Technology

[0002] In the fields of automotive electronics, consumer electronics, and communication equipment, FAKRA board-end connectors serve as core signal transmission interface components. The reliability of the connection between the signal terminals and the PCB board directly determines the signal transmission quality and operational stability of the entire system.

[0003] As the core of FAKRA connectors, the signal terminals' structural design is a key factor affecting contact reliability. In existing technologies, FAKRA board-end connectors often employ traditional elastic contact structures for their signal terminals, such as simply bent elastic sheets. This design generally suffers from the following technical drawbacks: Firstly, the limited deformation space of the elastic contact area results in insufficient contact pressure between the terminal and the PCB inner hole, leading to weak holding force. Under complex operating conditions such as equipment vibration and temperature cycling, problems like loosening and separation can easily occur, causing signal transmission interruptions, increased crosstalk, and other malfunctions, severely impacting system stability. Secondly, the uneven stress distribution of traditional elastic structures makes them prone to elastic fatigue failure during long-term use, leading to continuous deterioration of contact performance and failing to meet the stringent requirements for long lifespan and high stability in fields such as automotive electronics.

[0004] Furthermore, the existing flexible contact structure design of terminals often struggles to balance retention force and contact stability. Insufficient elastic space leads to inadequate retention force, while unreasonable structural design causes contact impedance fluctuations, making them unsuitable for high-precision signal transmission scenarios. In applications such as intelligent driving and vehicle networking, where real-time performance and accuracy of signal transmission are extremely critical, these shortcomings can directly impact system operational safety, thus severely restricting the application expansion of FAKRA board-end connectors in high-end electronic devices.

[0005] Therefore, it is urgent for technical personnel to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a shielded conductive pre-assembled component, which aims to solve the problems of insufficient elastic deformation space of signal terminals, weak holding force after mating with PCB board, poor contact reliability, poor shielding performance of connectors, and easy signal leakage and crosstalk in existing designs.

[0007] This invention relates to a shielded conductive pre-assembled assembly, comprising an electromagnetic shielding metal component, an insulating plastic component, a signal terminal, and a cavity-type mounting and positioning component. The signal terminal passes through the insulating plastic component and forms a fixed fit. The insulating plastic component and the signal terminal are inserted together into the electromagnetic shielding metal component and form an embedded fit. The electromagnetic shielding metal component and the cavity-type mounting and positioning component are assembled and connected as a whole, and the two enclose a closed protective space for isolating electromagnetic interference from the signal terminal and providing physical protection. Along its length extension direction, the signal terminal is sequentially formed by a guide positioning feature segment, a pre-insertion anti-interference avoidance segment, an elastic contact segment, a bending-resistant reinforcement segment, and a mating segment connected as a whole. Among them, the guide positioning feature segment is used for the assembly alignment of the signal terminal and the PCB board; the pre-insertion anti-interference avoidance segment is used to avoid hard interference during the assembly of the signal terminal and the PCB board; the elastic contact segment is formed with a press-fit elastic hole; the press-fit elastic hole increases the holding force between the signal terminal and the inner hole of the PCB through its own elastic deformation; the bending-resistant reinforcement segment is used to improve the overall structural strength of the signal terminal; and the mating segment is used to realize the insertion fit with the insulating plastic component.

[0008] As a further improvement to the technical solution disclosed in this invention, the wall of the press-fit elastic hole is provided with a symmetrically arranged elastic clamping structure; the elastic clamping structure generates clamping force through radial elastic deformation, so that the signal terminal and the PCB board form an interference fit, and the contact impedance is ≤50mΩ.

[0009] As a further improvement to the technical solution disclosed in this invention, the elastic clamping structure is a symmetrically distributed arc-shaped elastic arm; the free end of the arc-shaped elastic arm protrudes towards the central axis of the press-fit elastic hole, and the deformation stroke of the protruding part is 0.1 to 0.3 mm.

[0010] As a further improvement to the technical solution disclosed in this invention, the width of the arc-shaped elastic arm gradually decreases from the connection end with the wall of the press-fit elastic hole to the free end, and the outer contour is a continuous arc structure.

[0011] As a further improvement to the technical solution disclosed in this invention, the electromagnetic shielding metal part and the cavity-type mounting and positioning part are fixedly connected by laser welding to form a closed shielding structure with a shielding effectiveness ≥85dB@1GHz.

[0012] As a further improvement to the technical solution disclosed in this invention, the insulating plastic part is provided with a stepped hole for the signal terminal to pass through; the stepped hole and the mating section of the signal terminal form an interference fit.

[0013] As a further improvement to the technical solution disclosed in this invention, corresponding to the PCB board, the bottom of the cavity-type mounting and positioning component is formed with at least one positioning post; each positioning post is provided with an elastic pressing structure; and during the insertion process of the positioning post and the PCB board, the elastic pressing structure generates clamping force through its own radial elastic deformation.

[0014] Furthermore, the present invention also discloses a FAKRA board-end connector, including an insulating plastic shell and the aforementioned shielded conductive pre-assembly assembly; the shielded conductive pre-assembly assembly is assembled and fixed based on the insulating plastic shell; the electromagnetic shielding metal part is embedded in the mating cavity of the insulating plastic shell, while the cavity-type mounting positioning part is fitted and fixed to the inner sidewall of the insulating plastic shell; the guide positioning feature segment extends out of the insulating plastic shell towards the PCB board for alignment and mating with the PCB board.

[0015] In practical applications, the shielded conductive pre-assembled assembly disclosed in this invention can achieve at least the following beneficial technical effects, specifically: 1) Thanks to the press-fit elastic holes formed on the elastic contact section of the signal terminal, the elastic deformation space is effectively expanded. The contact holding force between the signal terminal and the PCB board is significantly improved through its own elastic deformation, thereby ensuring the connection stability. Furthermore, after the electromagnetic shielding metal parts and the cavity-type mounting and positioning parts are assembled and connected, they form a closed protective space, which can achieve efficient electromagnetic shielding of the signal terminal, isolate external electromagnetic interference, and fully ensure the stability and reliability of the signal transmission process. 2) The signal terminals adopt a segmented, integrated molding structure, with a guide and positioning feature segment, a pre-insertion anti-interference avoidance segment, an elastic contact segment, a bending-resistant reinforcement segment, and a mating segment arranged sequentially along the length direction. Among them, the guide and positioning feature segment enables the signal terminals to be quickly and accurately aligned with the PCB board, the pre-insertion anti-interference avoidance segment avoids hard interference during assembly, ensuring a smooth and unobstructed assembly process, and the mating segment forms a stable fixation through its adaptation design with the insulating plastic parts, improving assembly efficiency and alignment accuracy throughout the entire assembly process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional schematic diagram of the FAKRA board-end connector disclosed in this invention from one perspective.

[0018] Figure 2 This is a three-dimensional schematic diagram of the FAKRA board-end connector disclosed in this invention from another perspective.

[0019] Figure 3 This is a three-dimensional schematic diagram of the shielded conductive pre-assembled assembly disclosed in this invention.

[0020] Figure 4This is an exploded view of the shielded conductive pre-assembled component disclosed in this invention.

[0021] Figure 5 This is a three-dimensional schematic diagram of the signal terminals in the shielded conductive pre-assembled assembly disclosed in this invention.

[0022] Figure 6 This is a three-dimensional schematic diagram of the cavity-type mounting and positioning component in the shielded conductive pre-assembled assembly disclosed in this invention.

[0023] 1-Insulating plastic shell; 2-Shielded conductive pre-assembled component; 21-Electromagnetic shielding metal part; 22-Insulating plastic part; 23-Signal terminal; 231-Guiding and positioning feature section; 232-Pre-insertion anti-interference avoidance section; 233-Elastic contact section; 2331-Pre-fitting elastic hole; 2332-First arc-shaped elastic arm; 2333-Second arc-shaped elastic arm; 234-Bending-resistant reinforcement section; 235-Insertion section; 24-Cavity type mounting and positioning component; 241-Positioning insert. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments. Figure 1 , Figure 2 Two perspective views of the FAKRA board-end connector disclosed in this invention are shown, revealing that it mainly consists of an insulating plastic shell 1 and a shielded conductive pre-assembly assembly 2. The shielded conductive pre-assembly assembly 2 is assembled and fixed with the insulating plastic shell 1 as a reference to form a structurally stable whole, adapting to the installation and use requirements of the PCB board and providing a reliable carrier for signal transmission.

[0025] like Figure 3 , Figure 4 As shown in the diagram, the shielded conductive pre-assembled assembly 2 mainly consists of an electromagnetic shielding metal component 21, an insulating plastic component 22, a signal terminal 23, and a cavity-type mounting and positioning component 24. The signal terminal 23 passes through the insulating plastic component 22 and forms a fixed fit; the insulating plastic component 22 and the signal terminal 23 are inserted together into the electromagnetic shielding metal component 21 and form an embedded fit; the electromagnetic shielding metal component 21 is inserted into the cavity-type mounting and positioning component 24 and is fixedly connected to the cavity-type mounting and positioning component 24 by laser welding. The two components together form a closed protective space, which not only provides physical protection for the signal terminal 23, preventing damage from external forces, but also achieves highly efficient electromagnetic shielding with a shielding effectiveness ≥85dB@1GHz, isolating external electromagnetic interference and thus creating a stable environment for signal transmission.

[0026] The structural design of signal terminal 23 is crucial for ensuring the assembly accuracy and performance of the shielded conductive pre-assembled component 2. For example... Figure 5As shown, the signal terminal 23 is a bent component, and along its length, it is integrally formed with a guide positioning feature section 231, a pre-insertion anti-interference avoidance section 232, an elastic contact section 233, a bending-resistant reinforcement section 234, and a mating section 235. The guide positioning feature section 231 is precisely fitted to the mounting holes on the PCB board, guiding the signal terminal 23 to quickly and accurately align with the PCB board. The pre-insertion anti-interference avoidance section 232 adopts an avoidance structure design, preventing hard interference with the PCB board during initial assembly and ensuring smooth, unobstructed insertion. The bending-resistant reinforcement section 234, through its structural reinforcement design, significantly improves the overall structural strength of the signal terminal 23, effectively preventing bending deformation due to external forces during assembly or use, and extending the product's service life. The mating section 235 forms an interference fit with the stepped holes in the insulating plastic component 22, achieving stable fixation through structural adaptation and ensuring the positional stability of the signal terminal 23 within the component.

[0027] Here, it is particularly important to note that the elastic contact segment 233 increases the holding force between the signal terminal and the PCB inner hole through its own elastic deformation, specifically as follows: Figure 5 As shown, the elastic contact section 233 is formed with a press-fit elastic hole 2331, and the hole wall of the press-fit elastic hole 2331 is provided with a first arc-shaped elastic arm 2332 and a second arc-shaped elastic arm 2333 symmetrically arranged. The first arc-shaped elastic arm 2332 and the second arc-shaped elastic arm 2333 are arranged in a mirror symmetrical arrangement with the central axis of the press-fit elastic hole 2331 as the center of symmetry. The free ends of both are arc-shaped protrusions in the direction of the central axis to form a clamping contact surface that fits the inner hole of the PCB board. The deformation stroke of the protrusion is strictly controlled within a reasonable range of 0.1 to 0.3 mm. In this way, on the one hand, it ensures that the first arc-shaped elastic arm 2332 and the second arc-shaped elastic arm 2333 have sufficient deformation space to generate a stable clamping force; on the other hand, it effectively avoids elastic fatigue or structural damage caused by excessive deformation, ensuring that the elastic deformation process is precise, controllable, repeatable and stable, thereby providing a reliable structural foundation for the stable insertion of the signal terminal 23 and the PCB board.

[0028] As a further optimization of the above technical solution, the widths of the first arc-shaped elastic arm 2332 and the second arc-shaped elastic arm 2333 gradually decrease from the connection end with the wall of the press-fit elastic hole 2331 towards the free end (not shown in the figure), and both have continuous arc-shaped outer contours. In practical applications, the continuous arc structure combined with the large R-curve connection feature of the elastic contact section 233 effectively expands the elastic deformation space of the first arc-shaped elastic arm 2332 and the second arc-shaped elastic arm 2333. When the signal terminal 23 is inserted into the inner hole of the PCB board, the first arc-shaped elastic arm 2332 and the second arc-shaped elastic arm 2333 simultaneously generate a uniform clamping force through radial elastic deformation, so that the signal terminal 23 and the inner hole of the PCB board form a stable interference fit, making the contact impedance ≤50mΩ, significantly improving the insertion and holding force of the signal terminal 23 and the PCB board, and ensuring that the connection between the two is stable and not easy to loosen.

[0029] like Figure 6 As shown, corresponding to the mounting and positioning requirements of the PCB board, the bottom of the cavity-type mounting and positioning component 24 has two integrally formed positioning pins 241. Following the same design logic as the elastic contact section 233 of the signal terminal 23, the positioning pins 241 are also equipped with an elastic pressing structure, which will not be described in detail here for the sake of brevity. During the insertion process between the positioning pins 241 and the PCB board, their elastic pressing structure undergoes uniform radial elastic deformation with the insertion action, thereby forming a stable clamping force and tightly fitting the mounting hole wall of the PCB board. This design, together with the stable contact between the signal terminal 23 and the PCB board, forms a dual fixing synergy, further enhancing the connection stability between the shielded conductive pre-assembled component 2 and the PCB board from different installation dimensions, ensuring the positional reliability of the overall structure after assembly and avoiding relative displacement under complex working conditions.

[0030] The laser-welded structure of the electromagnetic shielding metal component 21 and the cavity-type mounting and positioning component 24, the segmented integrated design of the signal terminal 23, the precise parameter configuration of the elastic clamping structure, and the elastic press-fit design of the positioning pin 241 form a complementary and compatible design system for assembly accuracy, connection reliability, and structural durability. The combination of the guiding and positioning feature segment 231, the pre-insertion anti-interference avoidance segment 232, and the mating segment 235 improves efficiency and alignment accuracy throughout the entire assembly process; the deformation optimization of the elastic contact segment 233 significantly improves the contact holding force, and the efficient shielding effect of the enclosed protective space can effectively isolate external interference, thereby ensuring the stability and reliability of signal transmission; furthermore, the elastic press-fit design of the positioning pin 241 significantly enhances the structural durability of the shielded conductive pre-assembled component 2, enabling it to maintain stable performance even under complex working conditions such as vibration and temperature cycling, to meet the stringent requirements of high-reliability application scenarios.

[0031] Finally, it should be noted that, as Figure 1 , Figure 2As shown, the assembly of the shielded conductive pre-assembled component 2 and the insulating plastic shell 1 forms a complete FAKRA board-end connector. Multiple electromagnetically shielded metal parts 21 are fitted and securely embedded in the mating cavities of the insulating plastic shell 1; the cavity-type mounting and positioning component 24 is tightly fitted and fixedly connected to the inner wall of the insulating plastic shell 1. The guide positioning feature segment 231 of the signal terminal 23 extends from the side of the insulating plastic shell 1 facing the PCB board in a preset direction. Its extension length and position are precisely calibrated to provide precise guidance for subsequent alignment and mating with the PCB board, ensuring efficient and smooth mating and accurate positioning.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shielded conductive pre-assembled assembly, comprising an electromagnetic shielding metal component, an insulating plastic component, a signal terminal, and a cavity-type mounting and positioning component; wherein the signal terminal is inserted into the insulating plastic component and forms a fixed fit; the insulating plastic component and the signal terminal are inserted together into the electromagnetic shielding metal component and form an embedded fit; the electromagnetic shielding metal component and the cavity-type mounting and positioning component are assembled and connected as a whole, and the two enclose a closed protective space for isolating electromagnetic interference from the signal terminal and providing physical protection, characterized in that... Along its length, the signal terminal is sequentially and integrally connected by a guide positioning feature segment, a pre-insertion anti-interference avoidance segment, an elastic contact segment, a bending-resistant reinforcement segment, and a mating segment. The guide positioning feature segment is used for the assembly and alignment of the signal terminal with the PCB board. The pre-insertion anti-interference avoidance segment is used to avoid hard interference during the assembly of the signal terminal with the PCB board. The elastic contact segment has a press-fit elastic hole. The press-fit elastic hole increases the holding force between the signal terminal and the PCB inner hole through its own elastic deformation. The bending-resistant reinforcement segment is used to improve the overall structural strength of the signal terminal. The mating segment is used to achieve insertion and mating with the insulating plastic part.

2. The shielded conductive pre-assembled assembly according to claim 1, characterized in that, The wall of the press-fit elastic hole is provided with symmetrically arranged elastic clamping structures; the elastic clamping structures generate clamping force through radial elastic deformation, so that the signal terminal and the PCB board form an interference fit, and the contact impedance is ≤50mΩ.

3. The shielded conductive pre-assembled assembly according to claim 2, characterized in that, The elastic clamping structure consists of symmetrically distributed arc-shaped elastic arms; the free end of the arc-shaped elastic arm protrudes towards the central axis of the press-fit elastic hole, and the deformation stroke of the protruding part is 0.1 to 0.3 mm.

4. The shielded conductive pre-assembled assembly according to claim 3, characterized in that, The width of the arc-shaped elastic arm gradually decreases from the end connected to the wall of the press-fit elastic hole to the free end, and the outer contour is a continuous arc structure.

5. The shielded conductive pre-assembled assembly according to claim 1, characterized in that, The electromagnetic shielding metal component and the cavity-type mounting and positioning component are fixedly connected by laser welding to form a sealed shielding structure with a shielding effectiveness ≥85dB@1GHz.

6. The shielded conductive pre-assembled assembly according to claim 1, characterized in that, The insulating plastic part is provided with a stepped hole for the signal terminal to pass through; the stepped hole and the mating section of the signal terminal form an interference fit.

7. The shielded conductive pre-assembled assembly according to any one of claims 1-6, characterized in that, Corresponding to the PCB board, the bottom of the cavity-type mounting and positioning component is formed with at least one positioning post; each positioning post is provided with an elastic pressing structure; and during the insertion process of the positioning post and the PCB board, the elastic pressing structure generates a clamping force through its own radial elastic deformation.

8. A FAKRA board-end connector, characterized in that, The device includes an insulating plastic shell and a shielded conductive pre-assembled assembly as described in any one of claims 1-7; the shielded conductive pre-assembled assembly is assembled and fixed with the insulating plastic shell as a reference; the electromagnetic shielding metal part is embedded in the insertion cavity of the insulating plastic shell, and the cavity-type mounting positioning part is fitted and fixed to the inner sidewall of the insulating plastic shell; the guide positioning feature segment extends out of the insulating plastic shell on the side facing the PCB board for alignment and insertion with the PCB board.

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