Plate end contact element for electric connector and plate end connector

Abstract

The invention relates to the technical field of electric connectors, and particularly discloses a plate end contact piece for an electric connector and the plate end connector. Wherein the plate end contact piece is provided with a contact part and a pin part which are matched with each other through a bending structure; the contact part and the pin part of the plate end contact member are in a combined connection structure formed in a split manner. The bending structure effectively eliminates the technical defects of bending part deformation and bending diameter requirements of a traditional integrated bending type plate end contact piece, is not limited by the diameter of the plate end contact piece, can obtain a bending structure meeting the design size and unified specification regardless of the diameter of the plate end contact piece, is favorable for improving the finished product quality of the plate end contact piece, and is suitable for large-scale popularization and application. And compactness and miniaturization of the whole structure are facilitated.

Description

Technical Field

[0001] The invention relates to an electric connector, in particular to a board terminal contact piece for the electric connector, and a board terminal connector comprising the board terminal contact piece. Background Art

[0002] The interface electrical connector of the charging module is composed of a board-end connector and a line-end connector that are mated in a plug-in relationship.

[0003] The board-end connector at least has a mounting plate, a cover plate and a plurality of board-end contacts. Specifically, the cover plate is assembled at the rear side of the mounting plate (relative to the front end in the plug-in and unplug direction); inside the mounting plate and the cover plate, there are multiple cavities for assembling the board-end contacts and cavities for assembling the signal contacts arranged at intervals along the length direction (with the plug-in and unplug direction as the front-to-back reference, the length direction is the left-right lateral direction relative to the front-to-back direction). In the working environment, the PCB board is assembled at the bottom side of the mounting plate and the cover plate, and pads corresponding to the cavities of the board-end contacts and matching the solder feet of the corresponding board-end contacts are formed on the PCB board. The board-end contact has a contact portion and a pin portion. The contact portion is inserted into the corresponding board-end contact cavity of the mounting plate from back to front (i.e., the plug-in direction), and the contact portion (usually a pin structure) in the mounting plate is used to be plugged in and matched with the corresponding contact (usually a sleeve structure) of the line-end connector; the pin portion is located in the board-end contact cavity of the cover plate, or in other words, in the board-end contact cavity between the cover plate and the mounting plate, and the solder foot at the bottom end of the pin portion is welded to the corresponding pad on the PCB board. Therefore, the board-end contact has a contact portion and a pin portion that are matched with a nearly 90° bend structure, that is, the pin portion of the board-end contact and the contact portion basically form a vertical matching relationship in the plug-in and pull-out direction.

[0004] For a long time, in order to improve the production efficiency of board-end contacts and reduce production costs, the industry has been producing bent structure board-end contacts by first machining or cold heading a contact blank with a contact portion and a pin portion reserved in the axial direction, and then bending the integrally formed contact blank with a bending jig to obtain a finished product. In other words, the existing board-end contacts have a contact portion and a pin portion with an integrated bending structure, such as the technology disclosed in the Chinese patent document entitled "An electrical connector and its connector housing", with a publication number of CN 105406267 B and a publication date of January 16, 2018. Figure 1 The structure shown.

[0005] The one-piece bending structure of the traditional board-end contact has the technical characteristics of high production efficiency and low production cost. However, after repeated research by the applicant, it was found that the one-piece bending board-end contact has the following major technical problems: First, there is always bending deformation at the bending part of the one-piece bending board-end contact, and this bending deformation becomes more obvious as the diameter of the board-end contact increases, that is, the deformation of the bending part of the board-end contact is proportional to the diameter of the board-end contact; thus, the one-piece bending board-end contact cannot obtain a relatively ideal, uniform and standardized bending arc structure at the bending part, resulting in that the structural dimensions of the contact part and the pin part are not easy to reliably guarantee, directly reducing the qualified rate of finished products, and also directly reducing the overall assembly accuracy in the assembly structure such as the mounting plate, ultimately reducing the finished product quality of the manufactured board-end connector and increasing the manufacturing cost of the finished board-end connector; Secondly, the bending radius of the integral bending board-end contact is proportional to the diameter of the board-end contact. When the diameter of the board-end contact is larger, the bending radius is also larger. Only a large bending radius can obtain a bending arc structure that meets the technical requirements. However, this also increases the pin height and contact length of the board-end contact, making the overall molding structure of the board-end contact larger in volume. The board-end contact is a component of the board-end connector, which is obviously not conducive to the molding of the miniaturized board-end connector, and the resulting molding is not conducive to the miniaturization of the entire electrical connector. It is difficult to meet the market's technical requirements for miniaturized electrical connectors, and it is also difficult to control the manufacturing cost of the finished board-end connector. Third, when the diameter of the integrated bent board-end contact increases, the diameter of the solder foot at the bottom of the pin portion will also increase, which makes the welding technology between the pin portion and the PCB board more difficult and increases the time of the welding operation. It is bound to put forward higher technical requirements on the heat resistance of the relative shell structure including the PCB board, which will also make it more difficult to control the manufacturing cost of the finished board-end connector; Fourthly, when the diameter of the weld foot of the one-piece bent board-end contact increases, the large weld foot will lead to a larger weld scar, which will directly reduce the electrical safety distance between adjacent weld feet and reduce the quality of the finished board-end connector. It also reflects from another perspective that it is not conducive to the miniaturization of the overall structure of the board-end connector.

[0006] To summarize, the current technical logic for the one-piece bending forming of board-end contacts is based on the long-standing inertial production thinking of small-diameter (usually less than Φ5mm) board-end contacts required for single-pin small current (usually 80A and below) working conditions. It is obviously not suitable for the current structural forming of large-diameter board-end contacts required for single-pin high current working conditions, and technical improvements are needed. Summary of the invention

[0007] The technical purpose of the present invention is to provide a board-end contact for an electrical connector that is not only beneficial to improving the quality of the finished product, but also not limited by the diameter of the board-end contact and is beneficial to a compact and miniaturized structure, as well as a board-end connector including the board-end contact, in view of the particularity of the board-end connector of the above-mentioned electrical connector and the shortcomings of the prior art.

[0008] The technical purpose of the present invention is achieved by the following technical solution: a board-end contact for an electrical connector, the board-end contact having a contact portion and a pin portion matched with a bending structure; The contact portion and the pin portion of the board end contact piece are a combined connection structure formed separately.

[0009] The above-mentioned technical measures are aimed at the particularity of the technical requirements of the board-end contact of the above-mentioned board-end connector. Under the premise of not changing the coordination of the contact portion and the pin portion of the board-end contact with the bending structure, the contact portion and the pin portion constituting the board-end contact are combined into a whole with a combined connection structure formed separately, that is, the contact portion and the pin portion of the board-end contact are first formed separately, and then they are combined and connected into an integral structure, so that the bending structure of the board-end contact is still retained.

[0010] The combined connection structure after the separate molding of the contact part and the pin part effectively eliminates the disadvantages of the deformation of the bending part and the bending diameter requirement of the above-mentioned integrated bending type board end contact, and is not limited by the diameter of the board end contact. It can be a structural molding for a small diameter board end contact (i.e., a single pin current ≤80A, a contact section outer diameter ≤5mm) required for a single pin low current working environment, or a large diameter board end contact (i.e., a single pin current >80A, a contact section outer diameter >5mm) required for a single pin high current working environment. Regardless of the diameter of the board end contact, a bending structure that meets the design size and is uniformly standardized can be obtained, which is conducive to improving the quality of the finished board end contact, and is also conducive to the compactness and miniaturization of the overall structure, especially the large diameter board end contact required for a single pin high current working environment. With these technical advantages, the board end connector of the board end contact using the above technical measures has high finished product quality, is conducive to compactness and miniaturization, and thus is conducive to effectively controlling the manufacturing cost of the finished board end connector while meeting the technical requirements.

[0011] In addition, the above-mentioned combined connection structure after the contact part and the pin part are separately formed eliminates the bending deformation of the contact part, so that the structural form of the contact part is not limited to a solid pin structure, but can be a hollow plug-in structure. In other words, the board-end contact can be formed of a hollow plug-in structure according to the above-mentioned split combined connection structure, and is not limited to the long-term limitation that the board-end contact can only adopt a solid pin structure, so it can flexibly adapt to the technical needs of the market.

[0012] As one of the preferred technical solutions, the contact portion has an integrally formed contact section, a limiting section and a contact side assembly section, the contact section is used to be plugged and matched with a corresponding contact piece of the line end connector, the contact side assembly section is used to be combined and connected with the pin portion, the limiting section is located between the contact section and the contact side assembly section and is radially convex, and the limiting section is used to be assembled with a mounting plate of the board end connector; The pin portion comprises an integrally formed solder foot section, a transition section and a pin side assembly section, wherein the solder foot section is used to be connected to the PCB board at the board end connector, the pin side assembly section is used to be combined and connected with the contact portion, and the transition section is located between the solder foot section and the pin side assembly section; The pin portion is connected to the contact side assembly section of the contact portion through the pin side assembly section, and a bending structure is formed between the pin portion and the contact portion.

[0013] Furthermore, the contact side assembly section of the contact portion has a contact side joint surface in a planar structure for combining and connecting the pin portion, corresponding to the pin portion to be connected; Correspondingly, the pin side assembly section of the pin portion has a pin side joint surface in a planar structure for combining and connecting the contact portion, corresponding to the contact portion to be connected; The pin portion is connected to the corresponding contact side bonding surface of the contact portion through the pin side bonding surface combination, and a bending structure is formed between the pin portion and the contact portion.

[0014] The contact part and the pin part of the above technical measures are combined and connected together in a planar manner. The formed board end contact piece as a whole not only ensures the reliability of the electrical connection, but also ensures the stability of the combined connection structure of the two, and is also conducive to the compactness and miniaturization of the overall structure.

[0015] Furthermore, the contact side assembly section of the contact portion is used to arrange the thickness direction of the pin portion, and is formed with a plurality of mutually independent contact side bonding surfaces; Correspondingly, there are multiple pin parts, and each pin part is connected to the corresponding contact side bonding surface at the contact side assembly section through a pin side bonding surface combination; The outwardly extending portions of the pin portions connected to the contact side assembly section form a spacing fit in the thickness direction of the contact side assembly section.

[0016] The combined connection structure between the contact part and the pin part of the above technical measures enables the pin part to form a large number of dispersed arrangement structures, which effectively meets the technical requirements of single-pin large current carrying capacity. Specifically, the large number of dispersed arrangement structures of the pin part greatly increases the surface area of ​​the pin part, so that the skin effect of current transmission is fully exerted, and at the same time increases the contact points and welding points between the pin part and the PCB board. The increase in contact points forms multi-path transmission, and the increase in welding points is conducive to increasing the amount of tin and improving the conductive performance; on the other hand, the dispersed arrangement of the pin part forms a plurality of smaller diameter solder feet, which is conducive to reducing the technical difficulty of welding between each solder foot and the PCB board, improving the efficiency of welding operation, effectively reducing the thermal impact on the relative shell structure including the PCB board, and can ensure the electrical safety distance between the solder feet of adjacent board-end contacts with a compact structure, thereby improving the quality of the finished product of the miniaturized board-end connector. Therefore, while meeting the large current carrying capacity, it is conducive to effectively improving the quality of the finished product of the board-end connector and controlling the manufacturing cost of the finished product of the board-end connector.

[0017] Furthermore, the contact side bonding surface of the contact portion and / or the pin side bonding surface of the pin portion have an uneven pattern structure. This technical measure is conducive to improving the bonding stability between the contact portion and the pin portion, as well as increasing the bonding surface between the two and reducing the gap of warping and deformation at the bonding surface. In particular, when the contact portion and the pin portion are combined and connected by ultrasonic welding, the pattern structure on the bonding surface can make the melting of ultrasonic welding more complete and comprehensive, so as to reliably improve the quality of ultrasonic welding.

[0018] As one of the preferred technical solutions, the pin part is combined and connected to the contact part by a combined connection structure including welding or riveting. This technical measure can effectively ensure the integrity of the combined connection between the contact part and the pin part, especially by ultrasonic welding, which is easy to implement and has high combined connection quality.

[0019] As one of the preferred technical solutions, the pin portion is a straight plate structure in which the solder foot section, the transition section and the pin side assembly section are arranged in the same direction; Alternatively, the pin portion is a bent plate structure in which the welding foot section and the pin side assembly section are arranged in different directions and are bent at the transition section, and an obtuse angle fit is formed between the width center of the welding foot section and the axial center of the connected contact portion.

[0020] The above-mentioned pin parts with different structural forms can effectively adapt to the different technical requirements of the market.

[0021] Furthermore, the solder foot section of the pin portion has a plurality of solder feet arranged at intervals in the width direction, and the gap width between adjacent solder feet is greater than the thickness of the pin portion. This technical measure increases the matching width between adjacent solder feet, which is beneficial to the mold forming of the pin portion and ensures the structural strength of the mold, is beneficial to the welding operation between the solder feet and the PCB board, and increases the contact points and welding points between the pin portion and the PCB board. The increase in contact points forms a multi-path transmission of current, and the increase in welding points is beneficial to increasing the amount of tin and improving the conductive performance.

[0022] As one of the preferred technical solutions, the contact portion has a limiting surface with a planar structure at the top side and / or bottom side of the contact side assembly section; When the contact portion is assembled in the mounting plate of the board-end connector, the limiting surface of the contact-side assembly section cooperates with the limiting section to assemble and limit the contact portion in the mounting plate of the board-end connector.

[0023] The contact portion of the above technical measures, while satisfying the combined connection with the pin portion, forms a limiting structure that can be assembled with the mounting plate of the board-end connector, which is beneficial to improving the assembly stability and accuracy of the board-end contact piece in the mounting plate of the board-end connector, and further beneficial to ensuring the quality of the finished product of the molded board-end connector.

[0024] As one of the preferred technical solutions, the current carrying capacity of a single pin of the board-end contact is greater than 80A.

[0025] Furthermore, the outer diameter of the contact section of the board-end contact piece used for plugging into a mating wire-end connector is greater than 5 mm.

[0026] Compared with existing board-end contacts, the above technical measures have the technical characteristics of large single-needle current carrying capacity and large contact section outer diameter. The board-end contacts of the above combined connection structure can effectively adapt to the technical requirements of this working environment and have good pertinence.

[0027] As one of the preferred technical solutions, the contact part of the board-end contact piece is a pin structure. This technical measure is adapted to the particularity of the contact piece structure of the board-end connector of the electrical connector being a pin for a long time, and has good adaptability with other line-end connectors in the market.

[0028] A board-end connector comprises a mounting plate and a cover plate; In the mounting plate, a plurality of cavities for mounting the plate end contacts are arranged at intervals along the length direction; The cover plate is assembled at the rear end of the mounting plate; a plurality of cavities for assembling board end contacts are arranged at intervals along the length direction in the cover plate, and the board end contact cavity on the cover plate is in a one-to-one matching relationship with the board end contact cavity on the mounting plate; The board-end connector also includes a plurality of groups of board-end contacts of the above structure; Each group of board-end contacts is assembled in a corresponding board-end contact cavity formed by the mounting plate and the cover plate, and the contact portion of the board-end contact is located in the board-end contact cavity of the mounting plate, the pin portion of the board-end contact is located in the board-end contact cavity of the cover plate, and each solder leg of the board-end contact is respectively soldered to a corresponding solder pad on the PCB board.

[0029] The board-end connector of the above technical measures is based on a mature board-end connector shell structure and includes the board-end contact of the above-mentioned specific structure. Thus, without substantially changing the shell structure, a board-end connector is formed that can include the technical advantages of the above-mentioned board-end contact. This is beneficial for the board-end connector to achieve a large current carrying capacity while being compact and miniaturized, and can effectively control the manufacturing cost of the finished board-end connector.

[0030] Furthermore, each plate end contact piece cavity of the mounting plate has a limit retaining wall through which the contact portion of the corresponding plate end contact piece can pass forward; When the board end contact is assembled in the corresponding board end contact cavity of the mounting plate, the limiting section of the contact portion abuts against the rear side of the limiting retaining wall; Furthermore, at the rear side of the limiting retaining wall of the mounting plate, corresponding to the limiting surface at the top and / or bottom side of the contact side assembly section of the contact part, there are limiting columns arranged at the upper and / or lower sides, and the limiting columns are limitedly matched with the corresponding limiting surfaces of the contact part in a planar structure.

[0031] The matching structure of the mounting plate and the board-end contact of the above technical measures can effectively improve the assembly stability and accuracy of the board-end contact in the mounting plate, thereby facilitating the quality of the finished product of the molded board-end connector.

[0032] The beneficial technical effect of the present invention is: the above-mentioned technical measures, under the premise of not changing the coordination of the contact portion and the pin portion of the board-end contact piece with the bending structure, form the contact portion and the pin portion of the board-end contact piece into a whole with a combined connection structure formed separately, effectively eliminating the technical disadvantages of deformation of the bending part and bending diameter requirement of the traditional one-piece bending board-end contact piece, and is not limited to the diameter of the board-end contact piece. It can be the structural forming of a small-diameter board-end contact piece required for a single-pin low-current working environment, or it can be the structural forming of a large-diameter board-end contact piece required for a single-pin high-current working environment. Regardless of whether the diameter of the board-end contact piece is large or small, a bending structure that meets the design size and unified specifications can be obtained, which is beneficial to improving the quality of the finished product of the board-end contact piece, and is also beneficial to the compactness and miniaturization of the overall structure. In the combined connection structure between the contact part and the pin part of the above-mentioned board-end contact, the preferred ultrasonic welding structure can effectively improve the integrity of the combined connection between the two; the preferred structure of the pin part being dispersed in large quantities can effectively meet the technical requirements of single-pin large current carrying capacity on the one hand, and on the other hand, the dispersed arrangement of the pin part is conducive to the welding between the solder pin and the PCB board, and can improve the quality of the finished product of the miniaturized board-end connector with a compact structure. The board-end connector including the above-mentioned board-end contact has high finished product quality, is conducive to compactness and miniaturization, and thus is conducive to effectively controlling the manufacturing cost of the finished board-end connector while meeting the technical requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the board terminal contact of the present invention.

[0034] Figure 2 for Figure 1 Front view of the board end contact shown.

[0035] Figure 3 for Figure 2 Left view of .

[0036] Figure 4 for Figure 1 Schematic diagram of the structure of the contact part.

[0037] Figure 5 for Figure 1 Schematic diagram of the pin structure.

[0038] Figure 6 for Figure 5 Rear view of.

[0039] Figure 7 The figure is a schematic diagram of an exploded structure of an electrical connector including the board-end connector of the present invention.

[0040] Figure 8 for Figure 7 A schematic diagram of the vertical cross-section structure of the electrical connector shown.

[0041] Fig. 9 for Figure 7 Schematic diagram of the exploded structure of the board-end connector after the PCB board is removed.

[0042] Fig.10 for Fig. 9 A partial enlarged view of the mounting plate at the rear side of the plate end contact cavity.

[0043] Fig.11 for Fig. 9 A partial enlarged view of the assembly structure of the mounting plate and the plate end contact.

[0044] Fig.12 Another schematic diagram of the structure of the board terminal contact of the present invention.

[0045] Fig.13 It is another structural schematic diagram of the board terminal contact of the present invention.

[0046] Fig.14 for Fig.13 Schematic diagram of the planar cross-sectional structure of the board end contact shown.

[0047] The meaning of the codes in the figure are as follows: 1—contact part; 11—contact section; 12—limiting section; 13—contact side assembly section; 14—contact side joint surface; 15—limiting surface; 2—pin part; 21—solder foot section; 22—transition section; 23—pin side assembly section; 24—pin side joint surface; 25—solder foot; 3—mounting plate; 31—limiting baffle wall; 32—limiting column; 4—cover plate; 5—PCB board; A—board-end connector; B—line-end connector. DETAILED DESCRIPTION

[0048] The present invention relates to an electrical connector, specifically a board-end contact for an electrical connector, and a board-end connector including the board-end contact. The main technical solution of the present invention is specifically described below in conjunction with multiple embodiments. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Figure 10 and Fig.11 The technical solution of the present invention is clearly and in detail explained; Example 2 is combined with the accompanying drawings of the specification - that is, Fig.12 The technical solution of the present invention is clearly and in detail explained; Example 3 is combined with the accompanying drawings of the specification - that is, Fig.13 and Fig.14The technical solution of the present invention is explained clearly and in detail; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1, embodiment 2 or embodiment 3.

[0049] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention that contributes to the prior art. In addition, the expressions "approximately", "substantially" and the like regarding quantity or matching relationship in the following text mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantities or matching relationships.

[0050] Example 1 See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the present invention is a board-end contact piece for an electrical connector, which has a separately formed contact portion 1 and a pin portion 2, which form a bending matching relationship with a combined connection structure to match the technical requirements of the board-end connector.

[0051] Specifically, Figure 4As shown, the contact portion 1 is a solid pin structure. The contact portion 1 has an integrally formed, axially matched contact segment 11, a limit segment 12 and a contact side assembly segment 13. The contact segment 11 is used to be plugged and matched with the corresponding plug-in contact of the line end connector. The front end of the contact segment 11 (i.e., the end portion that is first inserted into the contact when plugging and unplugging in the working environment) is a chamfered structure that is approximately a spherical crown surface, so as to facilitate smooth guidance of the contact segment 11 in the corresponding plug-in contact when plugging and unplugging. The contact side assembly section 13 is used for combination connection with the pin portion 2. In order to ensure the stability of the combination connection with the pin portion 2 and improve the electrical connection performance, contact side bonding surfaces 14 with a planar structure for combination connection with the corresponding pin portion 2 are respectively formed on the left and right sides of the contact side assembly section 13 (i.e., the thickness direction; taking the plug-in direction as the front-to-back reference, the left and right sides or the thickness direction of the contact side assembly section 13 refers to the left and right lateral directions relative to the front-to-back directions). The contact side bonding surfaces 14 on the left and right sides of the contact side assembly section 13 are arranged back to back. In other words, the contact side assembly section 13 is used to arrange the pin portion 2 in the thickness direction (i.e., the distance between the left and right sides of the contact side assembly section 13), and two independent contact side bonding surfaces 14 are formed. The limiting section 12 is located between the contact section 11 and the contact side assembly section 13 and is radially convex outwardly formed. The limiting section 12 is used to be assembled with the mounting plate of the board-end connector. In order to ensure the assembly limit of the limiting section 12 in the mounting plate of the board-end connector, the step formed by the radial protrusion of the limiting section 12 from the contact section 11 forms an axial limiting surface, and the step formed by the radial protrusion of the limiting section 12 from the contact side assembly section 13 forms a limiting surface of the pin portion 2; of course, at the top and bottom sides of the aforementioned contact side assembly section 13 (with the plug-in direction as the front-to-back reference, the top and bottom sides refer to the corresponding parts in the height direction, that is, the height direction of the bend of the pin portion), there are respectively planar structured limiting surfaces 15 that pass through the limiting section 12.

[0052] as Figure 1 and Figure 3 As shown, in order to correspond to the contact side joint surfaces 14 on the left and right sides of the contact side assembly section 13 of the above-mentioned contact portion 1, and to adapt to the technical requirements of the large current-carrying working environment, the pin portion 2 is composed of two independent pieces, and the structures of the two pin portions 2 are basically the same.

[0053] as Figure 5 and Figure 6As shown, each pin portion 2 has an integrally formed solder foot section 21, a transition section 22 and a pin side assembly section 23. The pin portion 2 is a straight plate structure in which the solder foot section 21, the transition section 22 and the pin side assembly section 23 are arranged in the same direction. Among them, the solder foot section 21 is used to connect with the PCB board at the board end connector, so the solder foot section 21 has a plurality of solder feet 25 arranged at intervals in the width direction (corresponding to the axial direction of the contact portion 1). The pin side assembly section 23 is used to be combined and connected with the contact side assembly section 13 of the contact portion 1. The pin side assembly section 23 of the pin portion 2 corresponds to the contact side assembly section 13 of the contact portion 1 to be connected, and has a pin side joint surface 24 of a planar structure; in order to adapt to the combined connection and improve the stability of the combined connection, an uneven pattern structure is pressed on the pin side joint surface 24 of the pin side assembly section 23, and the pattern can be in any direction or shape. The transition section 22 is located between the solder foot section 21 and the pin side assembly section 23 so that the solder foot 25 is formed below the contact portion 1 (relative to the height direction of the bent pin portion) to meet the technical requirements of the board-end connector.

[0054] In the molding structure of each lead portion 2, the profile shape of the transverse cross section (relative to the axial direction of the solder foot 25 itself) of the solder foot 25 is determined according to the design requirements of the pad on the PCB board, and can be rectangular or circular. However, in order to facilitate mold molding and ensure the structural strength of the mold, and to improve the operability of welding with the PCB board, the gap width between adjacent solder feet 25 on the solder foot section 21 is preferably formed in a structure that is greater than the thickness of the main body of the lead portion 2 (referring to the transition section 22 and the lead side assembly section 23).

[0055] as Figure 1 , Figure 2 and Figure 3 As shown, the two pin portions 2 are combined and connected to the corresponding contact side joint surface 14 at the above-mentioned contact side assembly section 13 by ultrasonic welding through their respective pin side joint surfaces 24. The two pin portions 2 are arranged at intervals on the left and right sides of the contact side assembly section 13 of the contact portion 1, and also form a basically symmetrical arrangement structure. The combined connection of the two pin portions 2 on the contact portion 1 is positioned and limited by the limiting surface (i.e., the part protruding from the contact side joint surface 14) on the rear side (relative to the plug-in and pull-out direction of the contact portion 1) of the limiting section 12 of the contact portion 1, or in other words, the pin portion 2 is formed by the front and rear contour edges (i.e., the width direction of the pin portion 2) at the pin side assembly section 23 and the inner pin side joint surface 24, forming the combined connection positioning of the pin portion 2 on the contact portion 1.

[0056] Since the pin side assembly section 23 of each pin portion 2 is combined and connected to the corresponding contact side bonding surface 14 of the above-mentioned contact side assembly section 13 through the pin side bonding surface 24, the solder foot section 21 under the transition support of the transition section 22 of the pin portion 2 is located below the contact side assembly section 13, that is, the transition section 22 and the solder foot section 21 of the pin portion 2 extend outward below the contact side assembly section 13, so that the outward extension parts of the two pin portions 2 form a spacing match in the thickness direction of the contact side assembly section 13, that is, the outward extension parts of the two pin portions 2 connected at the contact side assembly section 13 form a spacing match in the thickness direction of the contact side assembly section 13. It can be intuitively seen from the combined connection structure between the above-mentioned contact portion 1 and the two pin portions 2 that although they are formed separately, the whole formed by ultrasonic welding still maintains a bending matching relationship of approximately 90°, that is, a bending structure matching is formed between the combined connected pin portion 2 and the contact portion 1, and the arrangement direction of the pin portion 2 tends to be perpendicular to the plug-in and pull-out direction of the contact portion 1.

[0057] This combined connection structure not only maintains the technical requirements of the board-end connector for the L-shaped bending of the board-end contact, but also enables the pin portion 2 to form a large number of dispersed arrangement structures on the contact portion 1, effectively increasing the surface area of ​​the pin portion, so that the skin effect of current transmission is fully exerted. At the same time, the molding structure of each solder pin 25 at the bottom of the pin portion 2 effectively increases the contact points and welding points between the pin portion 2 and the PCB board of the board-end connector. The increase in contact points forms a multi-path transmission of current, and the increase in welding points is conducive to increasing the amount of tin and improving the conductivity. Therefore, in addition to being able to form the current single-pin small current-carrying structure, the board-end contact of the above structure can also form a single-pin large current-carrying structure to meet the technical needs of the market (that is, the single-pin current carrying>80A, the outer diameter of the contact section 11>5mm, depending on the design requirements, non-fixed value). The technical advantages of the board-end contact of the above structure are particularly prominent in the single-pin large current-carrying structure.

[0058] See also Figure 7 , Figure 8 , Fig. 9 , Figure 10 and Fig.11 As shown, the board-end connector including the above-mentioned board-end contact piece includes a mounting plate 3 and a cover plate 4.

[0059] Among them, in the mounting plate 3, a plurality of cavities for assembling board-end contacts are arranged at intervals along the length direction (with the plug-in direction as the front-to-back reference, the length direction is the left-right horizontal direction relative to the front-to-back direction). In each board-end contact cavity of the mounting plate 3, there is a limit retaining wall 31 for the contact portion 2 of the corresponding board-end contact to pass forward (i.e., the front plugging direction of the plug-in direction), and the limit surface 15 corresponding to the top and bottom sides of the contact side assembly section 13 of the above-mentioned contact portion 1 (corresponding to the height direction of the board-end connector, that is, the bending direction of the pin portion of the board-end contact, with the direction of connecting to the PCB board as the bottom, and vice versa as the top) has limit columns 32 arranged at the upper side and lower side (corresponding to the height direction of the board-end connector, with the direction of connecting to the PCB board as the bottom, and vice versa as the top) respectively. The upper side limit column 32 has no requirements except that the bottom surface (corresponding to the height direction of the board-end connector, used as the surface for matching the board-end contact) must be formed in a plane structure. The lower side limit column 32 has no requirements except that the top surface (corresponding to the height direction of the board-end connector, used as the surface for matching the board-end contact) must be formed in a plane structure, and the left and right side walls (corresponding to the length direction of the board-end connector) are also required to be formed in a plane structure, that is, the left and right widths of the lower side limit column 32 (corresponding to the length direction of the board-end connector) match the spacing width between the left and right pin portions 2 of the above-mentioned board-end contact.

[0060] The cover plate 4 is assembled at the rear end of the mounting plate 3. In the cover plate 4, a plurality of cavities for assembling board end contacts are arranged at intervals along the length direction, and the board end contact cavities on the cover plate 4 and the board end contact cavities on the mounting plate 3 are in a one-to-one matching relationship. The combination of the board end contact cavities in a one-to-one matching relationship constitutes a cavity as a whole that can accommodate the corresponding board end contacts.

[0061] The PCB board 5 of the working environment is assembled at the bottom of the cover plate 4 and the mounting plate 3. On the PCB board 5, there are formed pads corresponding to the cavities of each board terminal contact and matching the solder feet 25 of the corresponding board terminal contact.

[0062] Each board-end contact of the above structure corresponds to each board-end contact cavity between the mounting plate 3 and the cover plate 4 and is assembled therein. Specifically, each group of board-end contacts is assembled in the corresponding board-end contact cavity formed by the mounting plate 3 and the cover plate 4, the contact portion 1 of the board-end contact is located in the board-end contact cavity of the mounting plate 3, the pin portion 2 of the board-end contact is located in the board-end contact cavity of the cover plate 4, and each solder leg 25 of the board-end contact is respectively soldered on the corresponding pad of the PCB board 5. In the installation structure of the board-end contact piece in the corresponding end contact piece cavity of the mounting plate 3, the limiting section 12 of the contact part 1 abuts against the rear side of the limiting retaining wall 31 as much as possible, that is, the axial limiting surface formed by the limiting section 12 protruding from the contact section 11 abuts against the rear side of the limiting retaining wall 31 of the mounting plate 3 as much as possible, forming the axial forward limit of the contact part 1; the two pin parts 2 of the board-end contact piece form an inverted U-shaped straddling groove from the contact part 1, straddling the lower side limiting column 32 on the rear side of the limiting retaining wall 31, so that the bottom of the contact side assembly section 13 of the contact part 1 The limiting surface 15 is located on the top surface of the lower side limiting column 32, and the inner wall surfaces of the two pin parts 2 are basically in surface contact (there is a reasonable assembly gap) with the left and right wall surfaces of the lower side limiting column 32, so that the lower side limiting column 32 forms a stable limit for the board end contact in the downward and left and right directions; the limiting surface 15 at the top of the contact side assembly section 13 of the contact part 1 and the bottom surface of the upper side limiting column 32 above are basically in surface contact (there is a reasonable assembly gap), so that the upper side limiting column 32 forms a stable upward limit for the board end contact. According to the assembly structure of the board end contact in the shell composed of the mounting plate 3, the cover plate 4 and the PCB board 5, the board end contact forms not only the axial limit (i.e. the front and rear direction of plugging and unplugging) in the shell, but also forms the Y direction (height direction) and X direction (length direction - i.e. left and right direction) limits in the height plane, such as Fig.10 shown.

[0063] The board-end connector A of the above structure is matched with the line-end connector B during use, and the line-end connector B can adopt a traditional structure without any requirement. In the molding structure of the above board-end connector A, except for the composition structure of the internal board-end contact and the assembly structure with the shell, the outer contour structure of the board-end connector A is the same as the conventional one, and the corresponding design of the conventional structure can be installed.

[0064] Example 2 The other contents of this embodiment are the same as those of Embodiment 1, except that: like Fig.12As shown, the pin portion 2 is a bent plate structure in which the solder foot section 21 and the pin side assembly section 23 are arranged in different directions, and a bent plate structure is formed at the transition section 22 to be bent backward (i.e., relative to the front and rear directions of plugging and unplugging) to adapt to different arrangement structures of the PCB board of the board-end connector, so that an obtuse angle matching relationship is formed between the width center of the solder foot section 21 and the axial center of the connected contact portion 1.

[0065] Example 3 The other contents of this embodiment are the same as those of Embodiment 1, except that: like Fig.13 As shown, the pin portion 2 is assembled and connected to the contact portion 1 by riveting. Of course, both ends of the rivet should be within the radially outward convex coverage of the limiting section 12 of the contact portion 1.

[0066] Example 4 The other contents of this embodiment are the same as those of Embodiment 1, except that: The contact side bonding surface of the contact portion has an uneven pattern structure, and the pin side bonding surface of the pin portion is a smooth surface structure.

[0067] Example 5 The other contents of this embodiment are the same as those of Embodiment 1, except that: The contact side joint surface of the contact part also has an uneven pattern structure.

[0068] Example 6 The other contents of this embodiment are the same as those of Embodiment 1, except that: On the contact side assembly section of the contact part, four bonding surfaces are opened along the thickness direction. Except for the two outermost bonding surfaces on the left and right sides acting independently, the two middle bonding surfaces form a U-shaped groove. The two bonding surfaces forming the U-shaped groove are used to connect the same pin part.

[0069] In this way, three pin portions arranged at intervals are connected to the contact side assembly section of the contact portion.

[0070] Example 7 The other contents of this embodiment are the same as those of Embodiment 1, except that: The contact side assembly section of the contact portion has only a single vertically arranged bonding surface, and the bonding surface is connected to a single pin portion.

[0071] As a possible variation of this embodiment, the joint surface on the contact side assembly section of the contact portion is formed at the bottom of the contact side assembly section, and the pin portion is assembled and connected with the top portion constituting the joint surface. Of course, in this variation structure, the pin portion connected to the bottom of the contact portion will cause position interference with the lower side position limiting column on the board-end connector mounting plate, so the lower side position limiting column on the mounting plate needs to be removed.

[0072] Example 8 The rest of the contents of this embodiment are the same as the structures of any one of Embodiments 1 to 7, except that: The contact portion is a hollow insert structure. Of course, based on the need for the contact portion to form a combined connection relationship with the pin portion, the hollow structure in the contact portion should not extend into the contact side assembly section of the contact portion. In other words, the contact section and the limit section of the contact portion are hollow structures (at least in the contact section), and the contact side assembly section is a solid core structure, so as to facilitate the molding of the connection structure of the pin portion. Correspondingly, the line-end connector that mates with the board-end connector uses a contact piece with a pin structure.

[0073] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0074] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments, or make equivalent substitutions for some of the technical features therein, such as achieving a combined connection between the pin portion and the contact portion by means of screw locking, etc. These modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A board-end contact for an electrical connector, the board-end contact comprising a contact portion (1) and a pin portion (2) matched in a bent structure; Features: The contact portion (1) and the pin portion (2) of the board end contact piece are a combined connection structure formed separately.

2. The board terminal contact for an electrical connector according to claim 1, characterized in that: The contact portion (1) comprises an integrally formed contact section (11), a limiting section (12) and a contact side assembly section (13); the contact section (11) is used for plugging and mating with a corresponding contact piece of the line end connector (B); the contact side assembly section (13) is used for assembly connection with the pin portion (2); the limiting section (12) is located between the contact section (11) and the contact side assembly section (13) and is radially outwardly convex; the limiting section (12) is used for assembly with a mounting plate (3) of a board end connector (A); The pin portion (2) comprises an integrally formed solder foot section (21), a transition section (22) and a pin side assembly section (23); the solder foot section (21) is used for connecting to a PCB board (5) at a board end connector (A); the pin side assembly section (23) is used for being assembled and connected to the contact portion (1); and the transition section (22) is located between the solder foot section (21) and the pin side assembly section (23); The pin portion (2) is assembled and connected to the contact side assembly section (13) of the contact portion (1) via the pin side assembly section (23), and a bending structure is formed between the pin portion (2) and the contact portion (1).

3. The board terminal contact for an electrical connector according to claim 2, characterized in that: The contact side assembly section (13) of the contact portion (1) corresponds to the pin portion (2) to be connected and has a contact side bonding surface (14) in a planar structure for combining and connecting the pin portion (2); Correspondingly, the pin side assembly section (23) of the pin portion (2) corresponds to the contact portion (1) to be connected and has a pin side bonding surface (24) in a planar structure for combining and connecting the contact portion (1); The pin portion (2) is combined and connected to the corresponding contact side bonding surface (14) of the contact portion (1) via the pin side bonding surface (24), and a bending structure is formed between the pin portion (2) and the contact portion (1).

4. The board terminal contact for an electrical connector according to claim 3, characterized in that: The contact side assembly section (13) of the contact portion (1) is used to arrange the pin portion (2) in a thickness direction, and is formed with a plurality of mutually independent contact side bonding surfaces (14); Correspondingly, there are a plurality of pin portions (2), and each pin portion (2) is combined and connected to a corresponding contact side bonding surface (14) at the contact side assembly section (13) via a pin side bonding surface (24); The outwardly extending portions of each pin portion (2) connected at the contact side assembly section (13) form a spacing fit in the thickness direction of the contact side assembly section (13).

5. The board terminal contact for an electrical connector according to claim 3 or 4, characterized in that: The contact side bonding surface (14) of the contact portion (1) and / or the pin side bonding surface (24) of the pin portion (2) have an uneven pattern structure.

6. The board terminal contact for an electrical connector according to claim 1, 2, 3 or 4, characterized in that: The pin portion (2) is combined and connected to the contact portion (1) by a combined connection structure including a welding method or a riveting method.

7. The board terminal contact for an electrical connector according to claim 2, characterized in that: The pin portion (2) is a straight plate structure in which a welding foot section (21), a transition section (22) and a pin side assembly section (23) are arranged in the same direction; Alternatively, the pin portion (2) is a bent plate structure in which the solder foot section (21) and the pin side assembly section (23) are arranged in different directions and are bent at the transition section (22), and an obtuse angle fit is formed between the width center of the solder foot section (21) and the axial center of the connected contact portion (1).

8. The board terminal contact for an electrical connector according to claim 2 or 7, characterized in that: The solder foot section (21) of the pin portion (2) has a plurality of solder feet (25) arranged at intervals in the width direction, and the width of the interval gap between adjacent solder feet (25) is greater than the thickness of the pin portion (2).

9. The board terminal contact for an electrical connector according to claim 2, 3 or 4, characterized in that: A limiting surface (15) having a planar structure is provided at the top side and / or the bottom side of the contact side assembly section (13) of the contact portion (1); When the contact portion (1) is assembled in the mounting plate (3) of the board-end connector (A), the limiting surface (15) of the contact-side assembly section (13) cooperates with the limiting section (12) to assemble and limit the contact portion (1) in the mounting plate (3) of the board-end connector (A).

10. The board terminal contact for an electrical connector according to claim 1, characterized in that: The single pin current carrying capacity of the board terminal contact is greater than 80A.

11. The board terminal contact for an electrical connector according to claim 10, characterized in that: The board-end contact piece is used as a contact section (11) of a plug-in mating wire-end connector (B) and has an outer diameter of >5 mm.

12. The board terminal contact for an electrical connector according to claim 1, 2 or 10, characterized in that: The contact portion (1) of the board end contact piece is a pin structure.

13. A board-end connector, comprising a mounting plate (3) and a cover plate (4); In the mounting plate (3), a plurality of cavities for assembling the plate end contacts are arranged at intervals along the length direction; The cover plate (4) is assembled at the rear end of the mounting plate (3); a plurality of cavities for assembling board end contacts are arranged at intervals along the length direction in the cover plate (4), and the board end contact cavities on the cover plate (4) and the board end contact cavities on the mounting plate (3) are in a one-to-one matching relationship; Features: The board-end connector (A) further comprises a plurality of groups of board-end contacts according to any one of claims 1 to 12; Each group of board-end contacts is assembled in a corresponding board-end contact cavity formed by the mounting plate (3) and the cover plate (4), and the contact portion (1) of the board-end contact is located in the board-end contact cavity of the mounting plate (3), the pin portion (2) of the board-end contact is located in the board-end contact cavity of the cover plate (4), and each solder leg (25) of the board-end contact is respectively soldered to a corresponding solder pad of the PCB board (5).

14. The board connector according to claim 13, characterized in that: Each plate end contact piece cavity of the mounting plate (3) is provided with a limiting retaining wall (31) through which the contact portion (2) of the corresponding plate end contact piece can pass forward; When the board end contact is assembled in the corresponding board end contact cavity of the mounting plate (3), the limiting section (12) of the contact portion (1) abuts against the rear side of the limiting retaining wall (31); Furthermore, at the rear side of the limiting retaining wall (31) of the mounting plate (3), corresponding to the limiting surface (15) at the top side and / or bottom side of the contact side assembly section (13) of the contact portion (1), there are limiting columns (32) arranged at the upper side and / or the lower side, and the limiting columns (32) are limitedly matched with the corresponding limiting surface (15) of the contact portion (1) in a planar structure.

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