PCB connecting terminal

Abstract

The invention discloses a PCB connecting terminal, and belongs to the technical field of connectors, the PCB connecting terminal comprises a shell and a wire pressing conductive assembly, the shell is provided with a wire plugging hole, a bolt hole and a connecting hole, the wire pressing conductive assembly is composed of at least two sub-bodies formed by integrally cutting a wire clamping piece and an equal-thickness conductive sheet body, and the sub-bodies are bent by 180 degrees through bending parts and locally fit to form fitting parts. The wiring part of each sub-body is inserted into the wire clamping piece and is conductively connected with an external wire harness, the fitting part extends downwards and branches to form independent pins which pass through the connecting holes at intervals and are welded on the PCB, and the sub-body is provided with a deformation part with at least two bending angles with opposite bending directions between the fitting part and the pins. The structure is integrally formed by cutting and folding a single metal sheet body, so that the contact resistance and the assembly tolerance of traditional multi-component assembly are eliminated, and low-impedance current distribution is realized; the deformation part can effectively absorb vibration impact energy, significantly reduce dynamic stress and thermal fatigue at a pin welding spot, and prevent sealing-off failure caused by long-term vibration.

Description

Technical Field

[0001] This invention belongs to the field of connector technology, and specifically relates to a PCB connection terminal. Background Technology

[0002] PCB terminal blocks are fundamental connection devices widely used in industrial automation control, new energy vehicle electronic control systems, and power electronic equipment. They are mainly fixed to printed circuit boards by soldering conductive pins, and electrical conduction between external wiring harnesses and internal circuits on the PCB is achieved by bolt crimping or spring clamping. Traditional terminal blocks typically use a single-line-to-single-pin structure, where an external wiring harness is connected to a single pin via an independent conductive component. This pin is directly soldered to the corresponding pad on the PCB, forming a point-to-point electrical connection path.

[0003] In applications requiring single-input multi-output (one-to-two or one-to-many) distribution, existing technologies typically employ welding multiple branch wires, riveting multiple independent conductive sheets, or using complex multi-process stamping parts to achieve current distribution. These multi-component assembly methods not only introduce additional contact resistance points and potential connection failure risks but also make it difficult to guarantee the consistency of impedance across branch circuits. Particularly in applications such as new energy vehicles and rail transit, external power harnesses often have thicker wire diameters and higher rigidity. Continuous vibrations and impacts generated during vehicle operation are directly transmitted to the terminals through the rigid harness. This causes the connection between the pins and PCB pads to be subjected to the coupling effect of mechanical stress and Joule thermal cycling for extended periods, easily leading to metal fatigue and micro-cracks in the solder joints. Ultimately, this results in desoldering, poor connections, or a surge in contact resistance, severely impacting the long-term reliability and safety of the circuit system. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a PCB connection terminal that forms a multi-pin structure by cutting and folding a single metal sheet, and has both elastic buffering and current distribution functions.

[0005] The technical solution adopted in this invention is as follows: This invention provides a PCB connection terminal, which is soldered onto a PCB board for connecting external wire harnesses and PCB board circuits. It includes a housing and a wire-pressing conductive component disposed within the housing. The housing has a plug hole and a bolt hole for inserting external wire harnesses. The bolt hole has a clamping bolt for adjusting the release / fixing of the wire-pressing conductive component on the external wire harness. The bottom of the housing has a connection hole for the wire-pressing conductive component to pass through and connect to the PCB board. The wire-clamping conductive assembly includes a wire clamp and a conductive component. The conductive component is formed by integrally cutting a conductive sheet of equal thickness and includes at least two sub-body. Each sub-body has a wiring part and a pin. The wiring part of at least one sub-body is inserted into the wire clamp and conductively connected to the incoming external wire harness. The sub-body is connected by a bending section. The two sub-body are bent 180 degrees and partially attached to form a bonding section. The bonding section of each sub-body extends towards the connection hole and branches, so that the pins of each sub-body are spaced out from the connection hole and inserted into the PCB board to independently connect to the corresponding circuit.

[0006] Preferably, the conductive component includes two sub-body parts, the wiring portions of the two sub-body parts are bent and inserted into the wire clamping component, and the end face of the fitting portion of the sub-body facing the wire clamping component and the end face of the wiring portion are electrically connected to the external wire harness.

[0007] Preferably, a locking block is provided on the end face of the sub-body that is far from the clamping member, and the housing is provided with a mounting groove that is correspondingly and limitly connected to the locking block.

[0008] Preferably, both the bonding part and the wiring part are provided with connecting solder points that fix the bonding parts of the two sub-body together.

[0009] Preferably, each sub-body has a deformation portion between the fitting portion and the pin, and the deformation portion includes at least two bends with opposite bending directions.

[0010] It is worth noting that the so-called opposite-direction bend refers to the direction in which the continuous sub-body's wiring portion extends unidirectionally towards the pin. The deformation portion extends and bends for the first time to form a bend. Using the bending direction of the sub-body at this bend as a reference, the bending direction of the second bend of the deformation portion to form a bend is compared, and the directions are opposite. By setting the two bend directions in opposite directions, the sub-body structure of the sheet body has a tendency to bend easily in two directions. As a result, when the entire wire-clamping conductive assembly clamps and fixes the external wire harness, it can form at least two bendable areas in two directions between the pin fixing point and the external wire harness fixing point, which plays a better buffering role when the external wire harness moves relative to the PCB board.

[0011] Preferably, the width of the deformable portion is smaller than that of the sub-body fitting portion and larger than that of the pin, and the width of the deformable portion gradually decreases from the fitting portion toward the pin.

[0012] Preferably, the deformable portion is formed by hollowing out the middle to create at least two narrow strips.

[0013] Preferably, the deformable part has two bends, with the two sub-body parts in a close-fitting state at the first bend and in a separated state at the second bend of the deformable part.

[0014] Preferably, the deformable part has three bends, with the sub-body at the first and second bends remaining in a fitted state, and the two sub-body at the third bend being in a separated state.

[0015] Preferably, one side wall end face of the housing has a retaining strip, and the other side wall end face has a retaining groove that cooperates with and limits the retaining strip.

[0016] The beneficial effects of this invention are as follows: This invention eliminates the additional contact resistance points and assembly tolerances present in traditional multi-component connections by cutting multiple sub-body structures from a conductive sheet of equal thickness and then bending and bonding them together into an integrated structure, thereby achieving the integration and low impedance of the current path.

[0017] The present invention utilizes the formed elastic deformation region to effectively absorb the mechanical vibration and impact energy transmitted by the external wire harness, significantly reduce the dynamic stress borne by the pin welding joint, and suppress the propagation of thermal fatigue cracks and creep failure caused by long-term vibration.

[0018] The present invention adopts a bifurcated extension design between the sub-body fitting part and the pin, which enables a single external wire harness to be stably distributed to multiple independent pins. This not only ensures the independence and reliability of the electrical connection of each branch, but also achieves good current distribution balance through the continuity of the sheet structure.

[0019] This invention utilizes a double-layer bonding structure formed by bending 180 degrees to significantly increase the effective cross-sectional area and heat dissipation surface area of ​​conductive components within a limited space, thereby improving the current carrying capacity and thermal stability of the terminals, while also enhancing the mechanical strength of the top pressure area.

[0020] The deformation section design of this invention enables the terminal to generate adaptive elastic deformation in multiple bending directions when subjected to wire harness tensile forces in different directions, avoiding stress concentration at the root of a single pin, thereby extending the service life of the solder joint and improving vibration resistance.

[0021] The integral cutting and folding process adopted in this invention simplifies the manufacturing process of conductive components. Complex multi-pin current-dividing structures can be formed through a single stamping process, reducing material waste and assembly steps, lowering production costs and improving the consistency of product electrical performance. Attached Figure Description

[0022] Figure 1 This is a first isometric view of two sets of first-type connection terminals arranged side by side in an embodiment of the present invention; Figure 2 This is a second isometric view of two sets of the first type of connection terminals arranged side by side in an embodiment of the present invention; Figure 3 This is an isometric view of the first type of wire-conductive component in this embodiment of the invention; Figure 4 This is a side view of the first type of wire-conductive component in an embodiment of the present invention; Figure 5 This is an isometric view of the first conductive component in the embodiment of the present invention after folding and installation; Figure 6 This is an isometric view of the first conductive component in an embodiment of the present invention when it is unfolded; Figure 7 This is an isometric view of the second type of connection terminal in an embodiment of the present invention; Figure 8 This is a side view of the second type of wire-conductive component in an embodiment of the present invention; Figure 9 This is an isometric view of the second type of wire-conductive component in this embodiment of the invention; Figure 10 This is an isometric view of the second type of conductive component in this embodiment of the invention after folding and installation; Figure 11 This is an isometric view of the third type of connection terminal in this embodiment of the invention; Figure 12 This is a side view of the third type of wire-conductive component in an embodiment of the present invention; Figure 13 This is a first isometric view of the third type of wire-conductive component in this embodiment of the invention; Figure 14 This is a second isometric view of the third type of wire-conductive component in this embodiment of the invention; Figure 15 This is an isometric view of the third type of conductive component in this embodiment of the invention after folding and installation; Figure 16 This is a top view of the first type of connection terminal in an embodiment of the present invention; Figure 17 This is the present invention. Figure 16 A schematic diagram of the cross-section after being cut along the AA section line.

[0023] In the diagram: 1-shell, 2-insertion hole, 3-bolt hole, 4-wire clamping bolt, 5-slot, 6-clamping strip, 7-connection hole, 8-wire clamping component, 9-conductive component, 10-clamping block, 11-connection solder joint, 12-bending part, 13-pin, 14-connection part, 15-deformation part. Detailed Implementation

[0024] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., appearing in the description of this invention are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1:

[0031] This embodiment provides a basic structural design for a PCB connection terminal. The connection terminal is fixed to the PCB board by welding a conductive connection structure, and is used to realize the electrical connection between the external wire harness and the internal circuit of the PCB board.

[0032] Reference Figure 1 and Figure 2 As shown, the connection terminal mainly includes a housing 1 and a wire conductive component disposed inside the housing 1.

[0033] The housing 1 can be injection molded from insulating material. The top of the housing 1 has a bolt hole 3, the side has a plug hole 2 for inserting external wire harnesses, and the bottom has a connection hole 7 for the wire clamping conductive component to pass through. A wire clamping bolt 4 is installed in the bolt hole 3. The external wire harness can be clamped or released by rotating the wire clamping bolt 4.

[0034] In this embodiment, the housing 1 has a dual-wire structure design. The top of a single housing 1 has two bolt holes 3, and two sets of wire-pressing conductive components are correspondingly arranged inside, with two corresponding connection holes 7. However, the connection holes 7 at the bottom of the housing 1 have two arrangement methods. One is that the bottom of the housing 1 is completely open, allowing the structure of the two sets of wire-pressing conductive components to connect to the PCB board to pass through. The other is that the housing 1 has two independent cavities inside, each with a set of wire-pressing conductive components, and two independent connection holes 7 at the bottom. This embodiment uses the second arrangement method for description.

[0035] Specifically, the wire clamping conductive assembly includes a wire clamp 8 and a conductive element 9. The wire clamp 8 is a frame-shaped structure formed by bending a metal sheet of the same thickness as the conductive element 9. This frame-shaped structure has a top pressure-bearing surface and a side guide surface. When the wire clamping bolt 4 is screwed in, its lower end abuts against the top pressure-bearing surface of the wire clamp 8, causing the wire clamp 8 to move vertically up and down inside the housing 1. When the wire clamping bolt 4 is screwed upward to loosen, the wire clamp 8 moves downward, forming the maximum clamping space at the insertion hole 2; when the wire clamping bolt 4 is screwed downward to tighten, the wire clamp 8 moves upward, pressing and fixing the external wire harness. The terms "up" and "down" refer to the direction of displacement of the wire clamp 8 when the wire clamping bolt 4 rotates. The wire clamping bolt 4 itself is only rotatably connected to the housing 1 and does not move linearly.

[0036] Furthermore, in this embodiment, the conductive element 9 is a conductive metal sheet of equal thickness. The material can be a commonly used conductive metal such as copper or copper alloy, and it is a sheet structure formed integrally by laser cutting or etching. It is cut into at least two interconnected sub-body structures.

[0037] Each sub-body includes a wiring part 14, a bonding part, a deformation part 15, and a pin 13. The sub-body is connected by a bending part 12, which is bent at 180° so that the sheets of the two sub-body are partially bonded together to form a bonding part.

[0038] The connector 14 is formed by further bending the fitting part by about 90° and is inserted into the frame-shaped wire clamp 8, so that the end face of the sub-body facing the wire clamp 8 and the end face of the connector 14 together form a conductive contact surface with the external wire harness.

[0039] The bonding part mainly achieves elastic snap-fit ​​and limiting with the housing 1. It can be fixed by setting a locking block 10 on the end face of the bonding part away from the clamping member 8, which cooperates with the corresponding mounting groove on the housing 1. At the same time, the bonding area between the bonding part and the wiring part 14 can be further fixedly connected by the connecting solder joint 11 to ensure the reliability of electrical contact. It is worth noting that the connecting solder joint 11 in this embodiment refers to the protruding interlocking structure formed between the bonding areas by ordinary welding or ultrasonic welding, so that several points with large connecting force are formed between the two bonding surfaces of the sheet, and the connection stability of the structure in this area is enhanced by the processing technology.

[0040] The fitting part of each sub-body extends downward and branches, so that the pins 13 of each sub-body pass through the connection holes 7 at intervals. The width of the pins 13 is designed to be basically the same as the thickness of the sub-body, so as to be smoothly inserted into the corresponding hole of the PCB board for soldering and fixing. The entire connection terminal relies solely on the soldering of the pins 13 to the PCB board to achieve mechanical fixing and electrical connection. Example 2:

[0041] This embodiment provides a complete implementation scheme for PCB connection terminals with a single-angle deformation section 15, based on the basic structural scheme and targeting the basic application scenario of single input and dual output. It is particularly suitable for conventional industrial control scenarios with basic requirements for vertical vibration damping and limited installation space.

[0042] In this embodiment, the conductive component 9 is a copper alloy conductive sheet of uniform thickness that is integrally cut by laser and then bent into shape, comprising two symmetrically arranged sub-body. The wiring portions 14 of the two sub-body are both bent and inserted into the clamping component 8. The end face of the fitting portion of the sub-body facing the clamping component 8 and the end face of the wiring portion 14 together form a conductive contact surface with the external wire harness. The fitting portions of the two sub-body are fixed by connecting solder joints 11. The end face of the fitting portion of the sub-body away from the clamping component 8 is integrally formed with a locking block 10. The locking block 10 is locked into the corresponding mounting groove of the housing 1 to realize the axial positioning of the conductive component 9 and the housing 1.

[0043] Reference Figure 16 and Figure 17 , Figure 17The image shows the engagement state of the conductive component 9 with the locking block 10 and the mounting groove between the housing 1 and the conductive component 9. Since the upper part of the conductive component 9 and the wiring part 14 are in a right-angled L-shaped structure, the upper part of the wiring part directly abuts against the inner top surface of the cavity inside the housing 1. During installation, the wire-pressing conductive assembly is assembled as a whole and inserted into the connection hole 7 at the bottom of the housing 1. At this time, the conductive component 9 with the locking block 10 will undergo a certain deformation so that the locking block 10 passes through the open end face of the connection hole 7. Then, when it abuts against the mounting groove, the entire conductive component 9 returns to its original shape.

[0044] Furthermore, the top of the housing 1 is provided with a bolt hole 3, the side is provided with a plug hole 2 for inserting an external wire harness, and the bottom is provided with a connection hole 7 for the wire clamping conductive component to pass through; a wire clamping bolt 4 is installed in the bolt hole 3, and the external wire harness can be clamped or released by rotating the wire clamping bolt 4.

[0045] The core improvement in this embodiment lies in the single-bend angle structure design of the deformable part 15: Along the extension direction of the sub-body from the wiring part 14 to the pin 13, the deformable part 15 is a single-bend cantilever structure formed by a single bend after the mating part extends downward. The overall thickness of the deformable part 15 is completely consistent with the sheet thickness of the conductive part 9. The width of the deformable part 15 is smaller than the width of the mating part of the sub-body and larger than the width of the pin 13. Moreover, the width of the deformable part 15 gradually narrows linearly from the mating part to the pin 13. While ensuring that the current-carrying cross-sectional area meets the rated current requirements, the elastic stiffness of the deformable part 15 is precisely controlled to avoid the problem of insufficient buffering due to excessive stiffness or insufficient structural stability due to insufficient stiffness.

[0046] The connecting hole 7 at the bottom of the housing 1 is an elongated through hole. The pins 13 of the two sub-body pass through the connecting hole 7 at intervals. The axis of the pins 13 is perpendicular to the PCB board surface. The center distance between the two pins 13 is not less than twice the pin width. The deformation stroke of the single-bend deformation part is small. Therefore, a radial gap of 0.2-0.5mm is reserved between the outer wall of each pin 13 and the hole wall of the connecting hole 7 to provide displacement margin for the elastic deformation of the deformation part 15 and avoid rigid interference between the pins 13 and the housing 1 during the deformation process.

[0047] In one embodiment of this invention, the deformable portions 15 of the two sub-body remain in a fully fitted state at the bend, with the bending convex direction being consistent, both bending in a direction away from the clamping member 8 to form a single bend angle, the angle of which is 60°-120°. The deformable portions 15 of the two sub-body remain in surface contact after bending, and the two pins 13 remain in a parallel and vertically downward state after bending.

[0048] In this implementation, when the external wiring harness vibrates and reciprocates perpendicular to the PCB board surface, the vibration energy is transmitted to the deformation part 15 through the housing 1 and the bonding part. The single-bend structure generates adaptive elastic deformation through the slight opening and closing of the bend angle, converting the mechanical energy of the vibration into a small amount of deformation internal energy dissipation, which greatly reduces the shear stress and tensile and compressive stress transmitted to the solder joint between the pin 13 and the PCB pad, and avoids fatigue cracks caused by long-term alternating stress on the solder joint; at the same time, the deformation parts of the two sub-body remain in contact throughout the process, ensuring the consistency of the current path from the wiring part to the two pins, ensuring that the impedance deviation of the two outputs is not large, and improving the balance of current distribution.

[0049] In another embodiment of this invention, the deformation portions 15 of the two sub-body are separated at the lower end of the mating portion. The two independent sub-body are each provided with a single-bend structure, and the bending convex directions of the two bends are completely opposite: the deformation portion of one sub-body bends towards the direction close to the clamping member 8, and the deformation portion of the other sub-body bends away from the clamping member 8. The angles of the two bends are the same, both between 60° and 120°. After bending, the pins of the two sub-body remain parallel and vertically downward, and the center distance between the two pins is consistent with the matching hole distance of the connecting hole at the bottom of the housing.

[0050] In this implementation, two opposing single-angle structures form a symmetrical elastic cantilever system. When the external wiring harness is pulled or swayed horizontally, the angle of one deformation part tends to tighten while the other tends to open. The horizontal stress is absorbed through the opposing coordinated deformation of the two deformation parts. When vertical vibration occurs, the two deformation parts simultaneously undergo angle opening and closing deformation to absorb the vertical impact energy, thus achieving two-way buffer protection in both horizontal and vertical directions.

[0051] Meanwhile, the separate design of the deformation parts of the two sub-body allows the two pins to independently adapt to the slight positional deviations of the PCB board pads, reducing the precision requirements of the soldering assembly, avoiding continuous internal stress after the pins are soldered due to pad positional deviations, and further improving the long-term reliability of the soldering structure.

[0052] As another implementation method of this embodiment, refer to Figures 1-6 The deformable part 15 of the sub-body that directly contacts the external wire harness on the inner side has a bend. This is not only to make the sub-body extend forward to form a gap, resulting in a larger gap between the two pins 13 at the bottom, but also to provide a certain bendable deformation area in its horizontal extension, thereby providing a certain shock absorption effect. Example 3:

[0053] This embodiment provides a complete implementation scheme for PCB connection terminals with double-bend deformation sections 15, based on the basic structural scheme, for high-reliability application scenarios such as new energy vehicle electronic control and rail transit on-board equipment with strong vibration and multi-directional impact.

[0054] Reference Figures 7-10 The core structure of this embodiment is compatible with the technical solution of the above embodiment 2. Through the double reverse convex bend design of front section fitting and rear section separation, it takes into account the balance of current distribution and multi-directional anti-vibration buffer performance. At the same time, it provides a variety of landable implementation methods for the narrow strip structure of the deformation part 15. All narrow strip structures are integrally cut and formed with the conductive sheet of the same thickness as the conductive part 9, without additional welding or riveting processes, maintaining the integrated characteristics of the structure.

[0055] In this embodiment, the conductive element 9 is formed by cutting two sub-body copper alloy sheets of equal thickness. The two sub-body are bent at 90° at the top and then tightly attached to form a bonding part. The wiring part 14 of the two sub-body is inserted into the frame structure of the clamping part 8 at the same time. The bonding part and the bonding part 14 are provided with connection solder points 11 to ensure zero gap in electrical contact of the bonding surface and eliminate additional contact resistance.

[0056] A locking block 10 is integrally formed on the end face of the sub-body that is away from the clamping member 8. The locking block 10 is interference-fitted into the mounting groove on the inner wall of the housing 1, so as to realize the omnidirectional positioning of the conductive member 9 in the housing 1 and effectively suppress the structural movement that occurs when subjected to vibration.

[0057] Along the extension direction of the sub-body from the wiring part 14 to the pin 13, the fitting part extends vertically downward into the deformation part 15 area. The deformation part 15 is provided with two continuous bends with completely opposite bending directions. The bend formed first along the extension direction of the sub-body is defined as the first bend and the bend formed later as the second bend. The bending direction of the first bend is closer to the side of the clamping member 8, and the bending angle is 90°-120°. The two sub-body remain in a completely fitting state throughout the bending section of the first bend, maintaining the integrity and rigidity of the structure root, ensuring the uniform distribution of current before shunting, and ensuring the stability of the fitting part and the snap-fit ​​structure of the housing 1.

[0058] The second bend protrudes away from the side of the clamping member 8, opposite to the bend protrusion of the first bend, with a bending angle of 60°-150°. The two sub-body parts separate at the starting position of the second bend, forming two independent cantilever structures. The two sub-body parts after separation bend independently at the second bend, and the ends of the bent sub-body parts extend vertically downward to form the pin 13.

[0059] The connection hole 7 at the bottom of the housing 1 is a double-hole structure corresponding to the arrangement of the two pins 13. The two pins 13 pass through the corresponding connection hole 7 independently, extend vertically downward from the housing 1, and are inserted into the corresponding pad holes on the PCB board for soldering and fixing. The horizontal interval between the two pins 13 is not less than 3 times the pin width. The deformation stroke of the double-bend deformation section is greater than that of the single-bend structure. Therefore, a 0.3-0.6mm annular gap is reserved between the outer wall of each pin 13 and the hole wall of the corresponding connection hole 7. At the same time, the minimum distance between the pin 13 and the outer edge of the outer wall of the housing 1 is not less than 1.5mm, providing sufficient displacement space for multi-directional elastic deformation, avoiding rigid collision between the pin 13 and the housing 1 during deformation, and ensuring the structural strength of the bottom of the housing 1 to prevent cracking of the edge of the connection hole 7 due to long-term vibration.

[0060] The core working principle of this embodiment is as follows: When the external wiring harness is subjected to multi-directional swaying, pulling, or impact caused by vehicle vibration, the housing 1 will deflect in the corresponding direction with the wiring harness. At this time, the double reverse convex bend structure of the deformation part 15 forms a cooperative deformation system. When the housing deflects towards the clamping member 8, the first bend tends to open and the second bend tends to tighten. When the housing deflects away from the clamping member 8, the first bend tends to tighten and the second bend tends to open. Through the complementary deformation of the two reverse bends, the external impact energy is fully absorbed and dissipated in the deformation path, avoiding stress concentration at the root of the solder joint of the pin 13, fundamentally suppressing fatigue cracks and desoldering failure of the solder joint under alternating stress. At the same time, the sub-body at the first bend remains in contact, ensuring that the length and cross-sectional area of ​​the two current paths are consistent, realizing impedance balance of the two outputs, and avoiding overheating of a single path.

[0061] As one embodiment of this example, the deformable part 15 removes material by symmetrically cutting the two sides of the sub-body sheet to form a single continuous narrow strip structure of equal width. The width of the narrow strip remains consistent throughout, and its width is greater than the width of the pin 13 and less than the width of the sub-body fitting part.

[0062] Specifically: the width of the bonding part is W, the width of the narrow strip is 0.4W-0.6W, and the width of pin 13 is 0.2W-0.3W, ensuring that the current carrying capacity of the narrow strip meets the total current requirements of the two outputs, while also having the adaptable elastic deformation capability.

[0063] The narrow strip structure completely covers the entire deformation area of ​​the first and second bends. At the first bend, the single narrow strips of the two sub-bodies remain completely aligned, while at the second bend, the narrow strips of the two sub-bodies separate and bend independently, forming two independent single-narrow-strip cantilever structures. This implementation method achieves the following beneficial technical effects: simple cutting process, low material removal rate, high structural strength, controllable elastic deformation, and precise adjustment of deformation stiffness by adjusting the width of the narrow strips, adapting to different vibration resistance requirements.

[0064] In another embodiment of this example, refer to Figures 9-10 The deformable part 15 forms two parallel narrow strip structures that are symmetrical on the left and right by cutting a strip-shaped through hole in the middle of the sub-body sheet. The width of the two narrow strips is the same, and the total width is greater than the width of the pin 13 and less than the width of the sub-body fitting part.

[0065] The double narrow strip structure simultaneously covers the first and second bend areas. At the first bend, the double narrow strips of the two sub-bodies remain completely fitted together, and the strip-shaped through hole in the middle forms a closed internal heat dissipation channel, improving the heat dissipation performance of the conductive components. At the second bend, the double narrow strips of the two sub-bodies separate simultaneously, forming two independent double narrow strip cantilever structures.

[0066] Compared to a single narrow strip structure, the double narrow strip structure extends the cyclic fatigue life of the deformed part by dispersing stress concentration points. At the same time, the through hole in the middle forms a convection heat dissipation channel, reducing the temperature rise under high current conditions and increasing the current carrying capacity of the terminals. The symmetrical structure also ensures uniform stress distribution during deformation, avoiding structural failure caused by stress concentration on one side.

[0067] Furthermore, in a preferred embodiment of this example, the deformable part 15 is cut to form a single or double elastic narrow strip structure with continuous wavy folds along the extension direction. The folding period and amplitude of the wavy shape can be adjusted according to the buffer stroke requirements. The bends are transitioned by arcs with a radius not less than twice the thickness of the conductive sheet to avoid excessive local current density and stress concentration at the bends. The thickness of the narrow strip is consistent with that of the base sheet, and the average width of the narrow strip is greater than the width of the pin 13 but less than the width of the bonding part. The two sub-body sections at the front of the wavy narrow strip structure remain bonded, while the rear section separates to form an independent wavy elastic cantilever.

[0068] By adopting this implementation method, the effective length of the deformation section is greatly extended within a limited axial space through a continuous wave-shaped folding structure, which significantly improves the elastic deformation stroke and energy absorption capacity, and can absorb impact vibrations with larger amplitude. At the same time, the folding structure with rounded transition avoids stress concentration and is suitable for harsh working conditions with long-term strong impact.

[0069] Furthermore, in another preferred embodiment of this example, the deformable part 15 is cut to form a continuous W-shaped folding elastic narrow strip structure along the extension direction. Each bend of the W-shape is an obtuse angle transition, with an angle of 90°-150°. Adjacent W-shaped units are connected end to end to form a continuous folded elastic structure. The radius of the arc at the bend is not less than twice the thickness of the conductive sheet to avoid excessively high local current density. The narrow strip can adopt a single or symmetrical double structure, with a thickness completely consistent with the base sheet, and the total width adapts to the size gradient of the fitting part and the pin. The two sub-units of the W-shaped narrow strip structure remain in contact at the first bend and separate at the second bend to form an independent W-shaped folded cantilever.

[0070] Using this implementation method, the folded W-shaped structure can achieve a large-stroke elastic deformation within a very short axial distance. Compared with the straight narrow strip, the deformation stroke is significantly improved under the same axial length. The W-shaped bend achieves the gradual dispersion of stress through multi-stage deformation, avoiding instantaneous overload of the solder joint caused by a single impact, and further improving the impact resistance reliability of the terminal. Example 4:

[0071] This embodiment provides a complete implementation scheme for a PCB connection terminal with a three-bend deformation section 15, based on the basic structural scheme. This embodiment achieves gradual stress release and multi-dimensional buffer protection through a three-continuous bend design with dual-segment bonding and end separation. It is also compatible with all narrow strip structure implementations in Embodiment 3, further improving the terminal's environmental adaptability and long-term reliability.

[0072] Reference Figures 11-15 In this embodiment, the conductive component 9 is still made of a high-conductivity copper alloy sheet of equal thickness by laser cutting. It includes two sub-body parts that are bent at 90° and attached together by bending part 12. The wiring part 14 of the two sub-body parts is bent and inserted into the clamping part 8 at the same time. The contact area between the contact part and the wiring part is fixed by multi-point connection solder joint 11 to ensure that there is no electrical gap on the contact surface.

[0073] Two sets of symmetrical locking blocks 10 are integrally formed on the end face of the sub-body fitting part away from the clamping part 8. The two sets of locking blocks 10 are respectively locked into the corresponding mounting grooves on the upper and lower sides of the inner wall of the housing 1, realizing the double limiting of the conductive part 9 in the housing 1, effectively suppressing the structural movement under strong vibration.

[0074] Along the extension direction of the subbody from the wiring part 14 to the pin 13, the fitting part extends vertically downward into the deformation part 15 area. The deformation part 15 is provided with three consecutive bends. The bending convex directions of two adjacent bends are opposite, forming a continuous S-shaped bending path. The bends formed sequentially along the extension direction of the subbody are defined as the first bend, the second bend, and the third bend.

[0075] The first bend protrudes towards the side closer to the clamping member 8, with a bending angle of 90°. The two sub-body parts remain fully fitted throughout the entire bending section of the first bend. The second bend protrudes away from the clamping member 8, opposite to the bending direction of the first bend, with a bending angle of 120°-160°. The two sub-body parts also remain fully fitted throughout the entire bending section of the second bend. The third bend is an independent bend of the separated sub-body, and its direction is opposite to that of the second bend. The bending angle is 60°-120°. The two sub-body separates at the beginning of the third bend, forming two independent elastic cantilever structures. The two separated sub-body bends independently at the third bend, and the ends of the bent sub-body extend vertically downward to form pins 13.

[0076] The connection hole 7 at the bottom of the housing 1 is a double hole structure. The two pins 13 pass through the corresponding connection holes independently, extend vertically downwards from the housing, and are soldered to the corresponding pads on the PCB board. The horizontal spacing between the two pins 13 is not less than 4 times the pin width.

[0077] The three-bend corner deformation section adopts a multi-stage buffer structure, which further increases the deformation stroke. Therefore, a 0.4-0.8mm annular gap is reserved between the outer wall of each pin 13 and the wall of the connecting hole 7. The minimum distance between the pin 13 and the outer edge of the outer wall of the housing 1 is not less than 2mm, which can adapt to the displacement requirements of large stroke deformation, while ensuring the structural strength of the bottom of the housing.

[0078] The core working principle of this embodiment is as follows: the design of the first two consecutive reverse convex bends and the sub-body fitting together throughout the entire process forms a flexible support structure similar to a double hinge. While ensuring that the current paths of the two sub-body are completely consistent and the current distribution is balanced, the first stage of stress release is achieved. When the external impact is transmitted to the deformation part, the first two bends first undergo coordinated deformation, absorbing most of the impact energy and significantly reducing the stress peak value transmitted to the end.

[0079] The separate, independent cantilever design at the third bend creates a second level of stress release. The two independent pins can each undergo adaptive deformation, further absorbing residual vibration energy. Simultaneously, they independently adapt to PCB deformation and pad position deviations, preventing stress concentration at a single solder joint. This tiered energy absorption structure, compared to a double-bend structure, further reduces dynamic stress at the solder joint, significantly improving the fatigue life and operational reliability of the terminals under long-term high-vibration conditions, meeting the long-term reliability requirements of core automotive safety components.

[0080] Preferably, in this embodiment, the deformation section 15 is compatible with all narrow strip structure implementations in Embodiment 3, including single equal-width narrow strips, edge-symmetrical double narrow strips, wavy folded narrow strips, and W-shaped folded narrow strips. The narrow strip structure covers the three bend areas throughout, wherein the narrow strips of the two sub-bodies at the first and second bends remain completely fitted, and the narrow strip at the third bend separates from the sub-bodies to form an independent elastic cantilever. The type can be flexibly selected according to the rated current, installation space, and vibration resistance requirements. Based on the core concept of this embodiment, those skilled in the art can further extend the deformation path and optimize the buffering and energy absorption effect by reasonably adjusting the number of bends.

[0081] Furthermore, in this embodiment, a conductive protective coating can be added to the surface of the deformable part 15. Without affecting the conductivity, the wear resistance and fatigue resistance of the deformable part can be improved, metal fatigue wear during repeated deformation can be avoided, and the service life of the terminal can be further extended.

[0082] The step-by-step stress release design of this embodiment allows external impact energy to be gradually absorbed and dispersed along the path of the deformation section 15, avoiding stress concentration at a single location.

[0083] Meanwhile, since the first two bends remain in contact, the two sub-body bodies maintain tight electrical contact over most of their length, ensuring uniform current distribution; while the separation at the ends allows the two pins 13 to independently adapt to minor deviations in the pad position when soldered to the PCB board, reducing excessive requirements on the drilling accuracy of the PCB board and improving the fault tolerance of assembly and the reliability of soldering.

[0084] This invention is not limited to the optional embodiments described above, and anyone can derive other various forms of products based on the inspiration of this invention. The specific embodiments described above should not be construed as limiting the scope of protection of this invention; the scope of protection of this invention should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. A PCB connection terminal, which is soldered onto a PCB board for connecting an external wire harness and a PCB board circuit, includes a housing (1) and a wire-pressing conductive component disposed within the housing (1). The housing (1) has a plug hole (2) for inserting an external wire harness and a bolt hole (3). The bolt hole (3) has a wire clamping bolt (4) for adjusting the release / fixing of the wire-pressing conductive component on the external wire harness. The bottom of the housing (1) has a connection hole (7) for the wire-pressing conductive component to pass through and connect to the PCB board. Its features are: The wire-clamping conductive assembly includes a wire clamp (8) and a conductive component (9). The conductive component (9) is formed by integral cutting of a conductive sheet of equal thickness and includes at least two sub-body. Each sub-body has a wiring part (14) and a pin (13). The wiring part (14) of at least one sub-body is inserted into the wire clamp (8) and conductively connected to the incoming external wire harness. The sub-body is connected by a bending part (12). The two sub-body are bent 180 degrees by the bending part (12) to form a bonding part. The bonding part of each sub-body extends to the connection hole (7) and branches, so that the pins (13) of each sub-body are kept at intervals and pass through the connection hole (7) and are inserted into the PCB board to independently connect to the corresponding circuit.

2. A PCB connection terminal according to claim 1, characterized in that: The conductive component (9) includes two sub-body parts. The wiring portions (14) of the two sub-body parts are bent and inserted into the wire clamping component (8). The end face of the fitting portion of the sub-body facing the wire clamping component (8) and the end face of the wiring portion (14) are electrically connected to the external wire harness.

3. A PCB connection terminal according to claim 2, characterized in that: A locking block (10) is provided on the end face of the fitting part of the sub-body away from the clamping member (8), and the housing (1) is provided with a mounting groove that is correspondingly and limitedly connected to the locking block (10).

4. A PCB connection terminal according to claim 2, characterized in that: Both the bonding part and the wiring part (14) are provided with connection solder points (11) that fix the bonding parts of the two sub-body to each other.

5. A PCB connection terminal according to claim 2, characterized in that: Each sub-body has a deformation portion (15) between the fitting part and the pin (13), the deformation portion (15) including at least two bends with opposite bending directions.

6. A PCB connection terminal according to claim 5, characterized in that: The width of the deformable part (15) is smaller than that of the body fitting part and larger than that of the pin (13), and the width of the deformable part (15) gradually decreases from the fitting part toward the pin (13).

7. A PCB connection terminal according to claim 5, characterized in that: The deformable part (15) forms at least two narrow strips through a central hollow.

8. A PCB connection terminal according to claim 5, characterized in that: The deformable part (15) has two bends. At the first bend, the two sub-body remains in a close-fitting state, and at the second bend, the two sub-body is in a separated state.

9. A PCB connection terminal according to claim 5, characterized in that: The deformable part (15) has three bends. The sub-body at the first and second bends is in a close-fitting state, while the two sub-body at the third bend is in a separated state.

10. A PCB connection terminal according to any one of claims 1-9, characterized in that: The housing (1) has a retaining strip (6) on one side wall end face and a retaining groove (5) on the other side wall end face that cooperates with the retaining strip (6) for limiting.

Images