Electrical connection assembly with stable contact resistance

Abstract

The utility model provides an electric connection assembly with stable contact resistance, which adopts an eccentric design and comprises a metal spring and a metal conductor, the metal spring has compression elasticity, and the metal conductor is arranged in the metal spring in a penetrating manner and moves along the direction of a central shaft of the metal spring. The metal conductor is provided with a contact structure with an asymmetric appearance, and the contact structure is sleeved in the metal elastic tube. When the metal conductor moves, one side of the contact structure is in stable contact with the inner side wall of the metal spring to generate stable contact resistance.

Description

Technical Field

[0001] This utility model relates to an electrical connection component, and more particularly to an electrical connection component with stable contact resistance. Background Technology

[0002] In the field of electronic equipment and circuit connections, spring-loaded contacts (SLCs) are movable electrical connection components with elastic structures, commonly used in applications such as pogo pins, battery contacts, and other dynamic conductive connection mechanisms. Traditional electrical connection components typically consist of a combination of a metal conductor and a spring. When the metal conductor is compressed by an external force, it moves along the spring's axis and forms electrical contact with the corresponding contact surface. The structure often features a centered conductor pin with a symmetrical design, aligning its geometric center with the central axis of the spring to achieve the design goal of linear reciprocating movement of the metal conductor within the spring. While this centered pin design offers advantages such as simplicity and ease of manufacturing, it is susceptible to spring deformation, tolerance errors, or assembly misalignment in practical applications. This can lead to uneven contact between the conductor and the spring, or the creation of minute gaps, resulting in unstable contact resistance, fluctuating conductivity, and even unstable signal transmission under low voltage or low current conditions. Furthermore, because the metal conductor lacks an anti-rotation structure, it is susceptible to rotation caused by external forces or vibrations, which may lead to poor electrical contact or uneven wear. To improve this phenomenon, some manufacturers have attempted to introduce an eccentric shaft design, which applies a small lateral force to the needle shaft during compression to enhance the stability and friction of the contact with the spring sidewall. However, such eccentric structures often lead to new problems such as unstable stroke, localized wear, or variations in contact resistance due to issues like friction asymmetry, needle shaft misalignment, or spring overload.

[0003] In view of this, how to provide an improved electrical connection component that adopts an asymmetrical conductor structure design so that the metal conductor can stably contact one side edge of the spring, thereby improving the shortcomings of the above-mentioned prior art, ensuring stable conduction performance under long-term cyclic operation, and avoiding the problem of unstable contact resistance caused by the conventional centered pin shaft design and the nonlinear friction and wear problem caused by the eccentric pin shaft design, is the subject of this invention. Utility Model Content

[0004] In view of the above problems, the purpose of this utility model is to provide a two-piece electrical connection assembly including a spring and a conductor. The conductor is designed with an asymmetrical structure to ensure that when the conductor moves up and down inside the spring, the contact between the conductor and the spring is stable, thereby generating a stable contact resistance.

[0005] To achieve the above objectives, this utility model provides an electrical connection component with stable contact resistance, which adopts an eccentric design, characterized by comprising:

[0006] A metal spring, possessing compressive elasticity; and

[0007] A metal conductor is inserted into a metal spring and moves along the central axis of the metal spring. The metal conductor has a contact structure with an asymmetrical appearance and the contact structure is fitted inside the metal spring. When the metal conductor moves, one side of the contact structure stably contacts the inner wall of the metal spring to generate a stable contact resistance.

[0008] The electrical connection assembly wherein the metal conductor is integrally formed, with a set of connectors at one end and the contact structure at the other end, and the set of connectors protruding from one end of the metal spring.

[0009] The electrical connection assembly, wherein the contact structure has a first contact side and a second contact side opposite to each other; when the metal conductor moves, the contact area between the first contact side and the inner wall of the metal spring is greater than the contact area between the second contact side and the inner wall of the metal spring.

[0010] The electrical connection assembly, with reference to a central axis of the metal conductor as a whole, has a convex arc portion on the first contact side and the second contact side near the joint of the contact structure, for engaging with the port of the metal spring.

[0011] The electrical connection assembly wherein the first contact side and the second contact side extend from the convergence of the convex arc portion, such that the first contact side and the second contact side at one end of the contact structure adjacent to the connector are respectively provided with a first inclined surface and a second inclined surface with different slopes, and the first inclined surface and the second inclined surface are connected to the central axis to form a contact point of the contact structure.

[0012] The electrical connection assembly wherein the first contact side extends from the convergence of the convex arc portion and protrudes outward to form a contact portion, and one side of the contact portion is the first inclined surface.

[0013] The electrical connection assembly wherein the metal spring has a helical compression structure and the width of its inner diameter corresponds to the width of the metal conductor.

[0014] The electrical connection assembly wherein the metal conductor is made of a conductive metal material and undergoes a surface treatment process to reduce the resistance of the contact resistance.

[0015] The aforementioned electrical connection component, wherein the surface treatment process is gold plating, silver plating, tin plating, surface polishing, surface deoxidation, chemical cleaning, or passivation treatment.

[0016] In summary, the electrical connection assembly of this invention employs an asymmetrical contact structure for the metal conductor, ensuring that the first contact side of this structure stably contacts the inner wall of the metal spring. This generates stable contact resistance during the conductor's vertical movement, thus solving the problem of unstable travel of the traditional eccentric probe shaft. Furthermore, in addition to the precise structural fit between the metal conductor and the metal spring, the metal conductor undergoes surface treatments such as gold plating, silver plating, or chemical passivation, which effectively reduces contact resistance, improves conductivity stability and overall connection reliability, making it particularly suitable for high-precision electrical components. Attached Figure Description

[0017] Figure 1 This is an exploded view of a preferred embodiment of the present invention.

[0018] Figure 2 This is a working appearance diagram of a preferred embodiment of the present invention.

[0019] Figure 3 This is a cross-sectional view of the working state of a second preferred embodiment of the present invention.

[0020] Figure 4 This is a free-state appearance diagram of a second preferred embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional view of the free state of a second preferred embodiment of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1-Electrical connection assembly; 10-Metal spring; 11-Metal conductor; 110-Connector; 111-Contact structure; 1110-First contact side; 1111-Second contact side; 1112-Convex arc portion; 1113-Contact portion; 1114-First inclined surface; 1115-Second inclined surface. Detailed Implementation

[0023] To enable those skilled in the art to clearly understand the contents of this utility model, the following description is provided in conjunction with the accompanying drawings.

[0024] Please see Figures 1-5The figures show an exploded view, an external view in operation, a cross-sectional view in operation, an external view in free state, and a cross-sectional view in free state, respectively, of a preferred embodiment of the present invention. As shown, the present invention provides an electrical connection component 1 with stable contact resistance. This component employs an eccentric design and includes a metal spring 10 and a metal conductor 11. The metal conductor 11 passes through the metal spring 10 and moves along the central axis of the metal spring 10 for use in a movable signal connector for contacting the object under test and transmitting electrical signals.

[0025] The metal spring 10 has a helical compression structure and thus compressive elasticity. The width of the inner diameter of the metal spring 10 corresponds to the width of the metal conductor 11, providing space for the metal conductor 11 to move stably. The metal conductor 11 is integrally formed and has a set of connectors 110 at one end and a contact structure 111 at the other end. The set of connectors 110 protrudes from one end of the metal spring 10, and the contact structure 111 is fitted inside the metal spring 10. When the metal conductor 11 moves, for example, moving up and down inside the metal spring 10, one side of the contact structure 111 stably contacts the inner wall of the metal spring 10, generating a stable contact resistance.

[0026] The contact structure 111 has an asymmetrical appearance and is provided with a first contact side 1110 and a second contact side 1111. When the metal conductor 11 is pressed by an external force and moves up and down, the contact area between the first contact side 1110 and the inner wall of the metal spring 10 is larger than the contact area between the second contact side 1111 and the inner wall of the metal spring 10. Furthermore, each of the two opposing contact sides is designed with a local protrusion or a special shape, so that when the contact structure 111 moves, the first contact side 1110 can always maintain contact with the inner wall of the metal spring 10, while the second contact side 1111 has a smaller contact area than the first contact side 1110, allowing the metal conductor 11 to move freely, thereby achieving a stable conductivity effect.

[0027] In this embodiment, with the central axis O of the metal conductor 11 as a reference, the first contact side 1110 and the second contact side 1111 of the contact structure 111 near the joint 110 are respectively provided with a convex arc portion 1112 for snapping into the port of the metal spring 10; the center of the convex arc portion 1112 is outwardly convex and converges relative to the two sides. The first contact side 1110 and the second contact side 1111 extend from one converging point of the convex arc portion 1112, so that at the end of the contact structure 111 that is adjacent to one end of the connector 110, the first contact side 1110 and the second contact side 1111 are respectively provided with a first inclined surface 1114 and a second inclined surface 1115 with different slopes. The first inclined surface 1114 and the second inclined surface 1115 are connected to the central axis O to form a contact point of the contact structure 111. The first contact side 1110 extends from the converging point of the convex arc portion 1112 and protrudes outward to form a contact portion 1113, and one side of the contact portion 1113 is the first inclined surface 1114. The metal conductor 11 is allowed to move freely through the second contact side 1111, and the contact portion 1113 can stably contact the inner wall of the metal spring 10.

[0028] Thus, the asymmetrical design of the metal conductor 11 matching the metal spring 10 ensures that the metal conductor 11 will not wobble or detach during movement, thereby reducing resistance fluctuations and improving conductivity, reliability, and durability. Incidentally, the metal conductor 11 is made of a conductive metal material and undergoes a surface treatment process, such as gold plating, silver plating, tin plating, surface polishing, surface deoxidation, chemical cleaning, or passivation, to reduce the contact resistance and further improve conductivity.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of this utility model should be covered within the patent scope of this utility model. The terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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 direct connection or an indirect connection through an intermediate medium; 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 utility model based on the specific circumstances.

Claims

1. An electrical connection assembly with stable contact resistance, characterized by an eccentric design: Include: A metal spring, possessing compressive elasticity; and A metal conductor is inserted into a metal spring and moves along the central axis of the metal spring. The metal conductor has a contact structure with an asymmetrical appearance and the contact structure is fitted inside the metal spring. When the metal conductor moves, one side of the contact structure stably contacts the inner wall of the metal spring to generate a stable contact resistance.

2. The electrical connection assembly as claimed in claim 1, characterized in that, The metal conductor is integrally formed, with a set of connectors at one end and the contact structure at the other end, and the set of connectors protruding from one end of the metal spring.

3. The electrical connection assembly as claimed in claim 2, characterized in that, The contact structure has a first contact side and a second contact side facing each other; when the metal conductor moves, the contact area between the first contact side and the inner wall of the metal spring is greater than the contact area between the second contact side and the inner wall of the metal spring.

4. The electrical connection assembly as claimed in claim 3, characterized in that, Based on the central axis of the entire metal conductor, the contact structure has a convex arc portion on the first contact side and the second contact side near the joint, so as to be snapped into the port of the metal spring.

5. The electrical connection assembly as claimed in claim 4, characterized in that, The first contact side and the second contact side extend from the convergence of the convex arc portion, such that the first contact side and the second contact side at the end of the contact structure that is adjacent to the joint are respectively provided with a first inclined surface and a second inclined surface with different slopes. The first inclined surface and the second inclined surface are connected to the central axis to form a contact point of the contact structure.

6. The electrical connection assembly as claimed in claim 5, characterized in that, The first contact side extends from the convergence of the convex arc portion and protrudes outward to form a contact portion, and one side of the contact portion is the first inclined surface.

7. The electrical connection assembly as claimed in claim 1, characterized in that, The metal spring has a helical compression structure, and the width of its inner diameter is set to correspond to the width of the metal conductor.

8. The electrical connection assembly as claimed in claim 1, characterized in that, The metal conductor is made of a conductive metal material and undergoes a surface treatment process to reduce the resistance of the contact resistance.

9. The electrical connection assembly as claimed in claim 8, characterized in that, The surface treatment process includes gold plating, silver plating, tin plating, surface polishing, surface deoxidation, chemical cleaning, or passivation.

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