Elastic sheet structure for connector

Abstract

The utility model provides an elastic sheet structure for a connector. The elastic sheet structure comprises a metal-sheet-shaped base body; the base body is provided with a first bent part, a second bent part, a third bent part, a fourth bent part and a fifth bent part which are sequentially arranged in the length direction. The first bending part is bent to form a semicircle, the semicircle part of the first bending part is provided with a stress buffer hole, and the tail end of the fifth bending part is provided with an arc-shaped contact salient point; a guide channel with an opening gradually reduced from outside to inside is formed between the fifth bending part and the base body, and the fifth bending part forms a guide inclined plane; and the fifth bending part is used for being elastically plugged with an external connector. According to the utility model, the problems of stress concentration, unstable contact, easy deformation, infirm installation and the like of a traditional elastic sheet structure are solved, the combination of high reliability, long service life and low-cost manufacturing is realized, and the elastic sheet is suitable for the field of precision electronic connectors.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, and specifically to a spring structure for connectors. Background Technology

[0002] In the field of electronic connectors, the spring structure is one of the key components for achieving electrical connections. Springs typically need to have good elasticity, conductivity, and mechanical stability to ensure that the connector can reliably connect circuit boards and other electronic components during long-term use.

[0003] Traditional contact spring structures typically employ a simple metal sheet design, using bending and shaping to achieve the insertion function with external connectors. However, as electronic devices evolve towards miniaturization and higher performance, the performance requirements for connector contact springs are also increasing.

[0004] The spring structure in a connector is a key conductive and elastic contact component, and its performance directly affects the reliability and durability of the connection.

[0005] The existing shrapnel structure has the following shortcomings:

[0006] 1. Stress concentration can easily lead to fatigue fracture: The stress distribution in the bending part of traditional springs is uneven. Especially after repeated insertion and withdrawal, the stress is concentrated in local areas (such as the root of the bend), which can easily cause cracks or fractures.

[0007] 2. Poor contact stability: The contact ends lack a buffer design, and the contact resistance fluctuates due to vibration or misalignment during insertion, which affects the reliability of signal transmission.

[0008] 3. Insufficient structural strength: Ordinary flanges or flat reinforcing ribs cannot effectively suppress the lateral deformation of the spring sheet under stress, resulting in insufficient overall rigidity and easy plastic deformation after long-term use.

[0009] Therefore, existing technologies have shortcomings and need further improvement. Utility Model Content

[0010] In view of the problems existing in the prior art, this utility model provides a spring contact structure for connectors.

[0011] To achieve the above objectives, the specific solution of this utility model is as follows:

[0012] This utility model provides a spring contact structure for a connector, comprising:

[0013] A sheet-like substrate;

[0014] The substrate has a first curved portion, a second curved portion, a third curved portion, a fourth curved portion, and a fifth curved portion arranged sequentially along its length.

[0015] The first curved portion is bent into a semi-circle, and the semi-circular part of the first curved portion is provided with stress buffer holes. The end of the fifth curved portion is provided with arc-shaped contact protrusions.

[0016] A guide channel with a gradually narrowing opening from the outside to the inside is formed between the fifth bend and the substrate, and the fifth bend forms a guide slope;

[0017] The fifth bend is used for flexible insertion with an external connector.

[0018] Furthermore, the stress buffer hole has an oblong hole structure.

[0019] Furthermore, both sides of the middle part of the substrate are provided with a first flange reinforcement structure that extends upward along the thickness direction of the substrate;

[0020] The first flange reinforcement structure is further provided with a first barb structure in the middle direction;

[0021] The fifth curved portion extends below the first barb structure.

[0022] Furthermore, the substrate is provided with two first circular holes; the diameter of the first circular holes is 1 / 3 to 1 / 2 of the width of the substrate;

[0023] The substrate has a second flange reinforcement structure on both sides facing downwards;

[0024] The second flange reinforcement structure is used to fix the spring structure to the PCB board.

[0025] Furthermore, both the first flange reinforcement structure and the second flange reinforcement structure have chamfers at their ends.

[0026] Furthermore, the substrate and its first, second, third, fourth, and fifth curved portions are made of beryllium copper alloy material with a thickness of 0.15-0.25 mm, and the surface is plated with a gold-nickel composite plating layer with a thickness of 0.003-0.005 mm.

[0027] Furthermore, the outer sides of the second and third curved portions are provided with wavy reinforcing ribs, and the protrusion height of the reinforcing ribs along the thickness direction of the base body is 1 / 4 to 1 / 3 of the thickness of the base body.

[0028] Furthermore, the third curved portion is provided with two first bending tabs.

[0029] Furthermore, the spring structure has an overall arc-shaped structure similar to a shoe.

[0030] The technical solution of this utility model has the following beneficial effects:

[0031] 1. Significantly improves fatigue resistance:

[0032] The semi-circular design of the first bend, combined with the waist-shaped stress buffer hole, effectively disperses the concentrated stress in the bend, delays crack formation, and extends the service life of the spring.

[0033] The use of beryllium copper alloy material (thickness 0.15-0.25mm), combined with gold-nickel composite plating (0.003-0.005mm), enhances elastic recovery and corrosion resistance, further reducing the risk of fatigue fracture.

[0034] 2. Enhanced connection stability and guiding accuracy:

[0035] The arc-shaped contact protrusion and guide slope design at the end of the fifth bend form a guide channel that gradually narrows from the outside to the inside, ensuring accurate alignment during insertion and reducing contact resistance fluctuations caused by offset and vibration.

[0036] The shoe-like curved overall structure optimizes the elastic deformation path and improves stability during insertion and removal.

[0037] 3. Multi-dimensional reinforcement of structural rigidity:

[0038] The combination of the first and second flanged reinforcement structures (with end chamfering) and the first barb structure achieves multi-directional limiting and resistance to lateral deformation, preventing the spring sheet from twisting or loosening under stress.

[0039] The wavy reinforcing ribs on the outer side of the second and third bends (with a protrusion height of 1 / 4 to 1 / 3 of the base thickness) and the bending protrusions of the third bend further enhance the local bending strength and balance the requirements of rigidity and flexibility. Attached Figure Description

[0040] Figure 1 This is a perspective view of the present invention;

[0041] Figure 2 This is a perspective view of the present invention from another angle;

[0042] Figure 3 This is a cross-sectional view of the present invention.

[0043] Attached image captions:

[0044] 1. Matrix; 2. First bend; 3. Second bend; 4. Third bend; 5. Fourth bend; 6. Fifth bend; 7. Stress buffer hole; 8. Contact protrusion; 9. Guide channel; 10. Guide slope; 11. First flange reinforcement structure; 12. First barb structure; 13. First round hole; 14. Second flange reinforcement structure; 15. Reinforcing rib; 16. First bending protrusion. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "front," "rear," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] Combination Figures 1-3 As shown, this utility model provides a spring contact structure for a connector, comprising:

[0050] Metal sheet-like substrate 1;

[0051] The base 1 has a first curved portion 2, a second curved portion 3, a third curved portion 4, a fourth curved portion 5, and a fifth curved portion 6 arranged sequentially along the length direction;

[0052] The first curved part 2 is curved into a semi-circle, and the semi-circular part of the first curved part 2 is provided with stress buffer holes 7. The fifth curved part 6 is provided with arc-shaped contact protrusions 8 at its end.

[0053] A guide channel 9 is formed between the fifth curved part 6 and the base 1, with the opening gradually narrowing from the outside to the inside. The fifth curved part 6 forms a guide slope 10.

[0054] The fifth curved portion 6 is used for flexible insertion with an external connector.

[0055] The stress buffer hole 7 has an oblong hole structure.

[0056] Both sides of the middle part of the substrate 1 are provided with a first flange reinforcement structure 11 that extends upward along the thickness direction of the substrate 1;

[0057] The first flange reinforcement structure 11 is further provided with a first barb structure 12 in the middle direction;

[0058] The fifth curved portion 6 extends below the first barb structure 12.

[0059] The substrate 1 is also provided with two first circular holes 13; the diameter of the first circular holes 13 is 1 / 3 to 1 / 2 of the width of the substrate 1;

[0060] The base 1 has a second flange reinforcement structure 14 on both sides facing downwards;

[0061] The second flange reinforcement structure 14 is used to fix the spring structure to the PCB board.

[0062] Both the first flange reinforcement structure 11 and the second flange reinforcement structure 14 have chamfers at their ends.

[0063] The substrate 1 and its first curved portion 2, second curved portion 3, third curved portion 4, fourth curved portion 5 and fifth curved portion 6 are made of beryllium copper alloy material with a thickness of 0.15-0.25mm and are plated with a gold-nickel composite coating with a thickness of 0.003-0.005mm.

[0064] The outer sides of the second curved portion 3 and the third curved portion 4 are provided with wavy reinforcing ribs 15, and the protrusion height of the reinforcing ribs 15 along the thickness direction of the base 1 is 1 / 4 to 1 / 3 of the thickness of the base 1.

[0065] The third curved portion 4 is provided with two first bending protrusions 16.

[0066] The spring structure has an overall arc-shaped structure similar to a shoe.

[0067] The principle of this utility model is as follows:

[0068] The spring sheet structure of this utility model achieves efficient elastic contact and reliable connection through the synergistic effect of multi-stage bending design, stress buffering mechanism and reinforcement structure. The specific working principle is as follows:

[0069] 1. Flexible insertion and guide alignment:

[0070] When the external connector is inserted, the arc-shaped contact protrusion 8 at the end of the fifth bend 6 contacts the connector terminal.

[0071] The gradually narrowing guide channel 9 formed by the guide slope 10 and the base 1 guides the connector to precise alignment, reducing the risk of offset or misalignment and ensuring a smooth insertion process.

[0072] The spring has an overall shoe-shaped arc structure. During insertion and extraction, it absorbs external force through the elastic deformation of multiple bending parts (first to fifth bending parts 6) to provide stable contact pressure.

[0073] 2. Stress dispersion and fatigue resistance mechanism:

[0074] The semi-circular design of the first curved part 2, combined with the waist-shaped stress buffer hole 7 set in its semi-circular area, evenly distributes the local concentrated stress to the surrounding area, avoiding cracks or fractures caused by stress concentration.

[0075] The wave-shaped stiffener 15 (located on the outside of the second and third bends 4) enhances local stiffness through a periodic undulating structure while allowing moderate elastic deformation, thus balancing strength and flexibility.

[0076] The high elastic modulus of beryllium copper alloy (thickness 0.15-0.25mm) and the wear resistance of gold-nickel composite coating (0.003-0.005mm) work together to reduce material fatigue caused by repeated insertion and removal.

[0077] 3. Structural strengthening and deformation control:

[0078] The first flange reinforcement structure 11 is folded upward and a first barb structure 12 is provided, which forms a linkage limit with the fifth curved part 6 extending below it to suppress the lateral twisting of the spring piece.

[0079] The second flange reinforcement structure 14 extends downward and is fixed to the PCB board. Combined with the two first round holes 13 on the base 1 (the diameter of which accounts for 1 / 3 to 1 / 2 of the width of the base 1), the installation stability is enhanced by multi-point mechanical locking to prevent vibration and loosening.

[0080] The two first bending tabs 16 of the third bending section 4 are locally thickened to further enhance bending strength and avoid excessive deformation.

[0081] 4. Guaranteed electrical conductivity and environmental resistance:

[0082] The excellent conductivity of beryllium copper alloy ensures low signal transmission loss, while the gold-nickel composite plating provides anti-oxidation and corrosion protection, making it suitable for high humidity or corrosive environments.

[0083] The arc-shaped design of contact bump 8 increases the effective contact area, reduces contact resistance fluctuations, and improves the stability of high-frequency signal transmission.

[0084] 5. Process adaptability design:

[0085] The waist-shaped hole, round hole and flange structure are all compatible with stamping forming process, simplifying the manufacturing process;

[0086] The chamfering at the end of the flange prevents scratches on the PCB or connector during assembly, thus improving production yield.

[0087] In summary, this spring structure achieves high-precision insertion, long-term fatigue resistance, and reliable fixation through multi-stage bending deformation, stress buffering, multi-directional limiting, and material optimization, making it suitable for the high-performance connection requirements of precision electronic equipment.

[0088] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent structural transformations made under the present utility model concept and based on the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the protection scope of the present utility model.

Claims

1. A spring contact structure for a connector, characterized in that, include: A sheet-like substrate; The substrate has a first curved portion, a second curved portion, a third curved portion, a fourth curved portion, and a fifth curved portion arranged sequentially along its length. The first curved portion is bent into a semi-circle, and the semi-circular part of the first curved portion is provided with stress buffer holes. The end of the fifth curved portion is provided with arc-shaped contact protrusions. A guide channel with a gradually narrowing opening from the outside to the inside is formed between the fifth bend and the substrate, and the fifth bend forms a guide slope; The fifth bend is used for flexible insertion with an external connector.

2. The spring-loaded structure according to claim 1, characterized in that: The stress buffer hole has a waist-shaped hole structure.

3. The spring-loaded structure according to claim 1, characterized in that: Both sides of the middle part of the substrate are provided with a first flange reinforcement structure that extends upward along the thickness direction of the substrate. The first flange reinforcement structure is further provided with a first barb structure in the middle direction; The fifth curved portion extends below the first barb structure.

4. The spring clip structure according to claim 3, characterized in that: The substrate is also provided with two first circular holes; the diameter of the first circular holes is 1 / 3 to 1 / 2 of the width of the substrate; The substrate has a second flange reinforcement structure on both sides facing downwards; The second flange reinforcement structure is used to fix the spring structure to the PCB board.

5. The spring-loaded structure according to claim 4, characterized in that: Both the first flanged reinforcement structure and the second flanged reinforcement structure have chamfers at their ends.

6. The spring-loaded structure according to claim 1, characterized in that: The substrate and its first, second, third, fourth, and fifth curved sections are made of beryllium copper alloy with a thickness of 0.15-0.25 mm and are plated with a gold-nickel composite coating of 0.003-0.005 mm thickness.

7. The spring clip structure according to claim 1, characterized in that: The outer sides of the second and third curved portions are provided with wavy reinforcing ribs, and the protrusion height of the reinforcing ribs along the thickness direction of the base body is 1 / 4 to 1 / 3 of the thickness of the base body.

8. The spring-loaded structure according to claim 1, characterized in that: The third curved section is provided with two first bending protrusions.

9. The spring-loaded structure according to claim 1, characterized in that: The spring structure has an overall arc-shaped structure similar to a shoe.

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