Bending stress resistant TYPE-C terminal pin reinforcing structure
By designing stress dispersion zones, reinforced supports, and elastic buffer layers on the TYPE-C terminal pins, the problem of fatigue fracture caused by stress concentration due to bending is solved, achieving high reliability and long lifespan for the terminal pins.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN TAIPUYI ELECTRONIC TECHNOLOGY CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-05-15
AI Technical Summary
Existing TYPE-C terminal pins are prone to fatigue fracture due to stress concentration caused by bending during frequent insertion and removal or long-term use. In particular, stress concentration is significant at the connection between the pin root and the elastic arm, which makes it difficult to meet the requirements of high reliability scenarios.
Design a TYPE-C terminal pin reinforcement structure to resist bending stress, including a stress dispersion zone, a reinforcement support, and an elastic buffer layer. The trapezoidal gradient cross section of the stress dispersion zone, the triangular support structure of the reinforcement support, the serpentine wave-shaped curved surface of the elastic arm, and the viscoelastic deformation of the elastic buffer layer work together to disperse and absorb bending stress, avoiding stress concentration and fatigue fracture.
It effectively reduces the maximum equivalent stress at the root, improves the fatigue resistance and service life of the terminal pins, and significantly enhances reliability and bending resistance in complex environments.
Smart Images
Figure CN224248988U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of terminal structure technology, specifically to a TYPE-C terminal pin reinforcement structure that resists bending stress. Background Technology
[0002] With the miniaturization of electronic devices and the standardization of interfaces, Type-C terminals have been widely used in consumer electronics, industrial equipment, and automotive electronics due to their advantages such as reversible blind insertion, high-speed data transmission, and high-current charging. However, existing Type-C terminal pins are prone to fatigue fracture due to stress concentration caused by bending during frequent insertion and removal or long-term use, especially at the connection between the pin root and the elastic arm. Because traditional structures often use abrupt cross-sectional designs, stress concentration is significant, resulting in generally low bending lifespan, which is difficult to meet the requirements of high-reliability applications. Utility Model Content
[0003] In order to overcome the shortcomings of existing technical solutions, this utility model provides a TYPE-C terminal pin reinforcement structure that resists bending stress, which can effectively solve the problems mentioned in the background art.
[0004] The technical solution adopted by this utility model to solve its technical problem is:
[0005] A TYPE-C terminal pin reinforcement structure resistant to bending stress includes a terminal body and pins disposed at the front end of the terminal body. The pins include a root connected to the terminal body and an elastic arm extending forward from the root. A stress dispersion zone is provided at the connection between the root and the elastic arm. The thickness of the stress dispersion zone gradually decreases along the extension direction of the pin. A reinforcement support is provided on the terminal body at a position corresponding to the root. The reinforcement support is fixedly connected to the root and forms a triangular support structure.
[0006] As a further description of the above technical solution, the cross-section of the stress dispersion zone is trapezoidal, the width of the upper base of the trapezoid is smaller than the width of the lower base, and the height of the trapezoid gradually decreases from the root towards the elastic arm.
[0007] As a further description of the above technical solution, the reinforcing support includes a first support plate and a second support plate integrally formed with the terminal body. The first support plate and the second support plate are symmetrically arranged on both sides of the pin, and the top ends of the first support plate and the second support plate are fixedly connected to the root.
[0008] As a further description of the above technical solution, the bottom ends of the first support plate and the second support plate are flush with the bottom surface of the terminal body, and the height of the first support plate and the second support plate is equal to the height of the pin.
[0009] As a further description of the above technical solution, the elastic arm is a serpentine structure, which includes an upper convex section and a concave section connected in sequence. The upper convex section and the concave section are alternately arranged, and the top surface of the upper convex section and the bottom surface of the concave section form a wavy curved surface.
[0010] As a further description of the above technical solution, the height of the convex section is 0.1-0.3mm, the depth of the concave section is 0.2-0.5mm, and the length of both the convex section and the concave section is 0.5-1mm.
[0011] As a further description of the above technical solution, an elastic buffer layer is provided on the outer side of the root of the pin. The elastic buffer layer is made of silicone or rubber material, and the thickness of the elastic buffer layer is 0.1-0.5mm.
[0012] As a further description of the above technical solution, the inner wall of the elastic buffer layer is tightly fitted to the root of the pin, and the outer wall of the elastic buffer layer is fixedly connected to the inner wall of the reinforcing support.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] This utility model provides a TYPE-C terminal pin reinforcement structure resistant to bending stress, which has at least one of the following beneficial effects during use:
[0015] The trapezoidal gradient cross-section (narrower at the top and wider at the bottom) in the stress dispersion zone reduces the maximum equivalent stress at the root from 120MPa to below 70MPa, lowering the stress concentration factor by 53% and effectively preventing fatigue fracture caused by abrupt changes in cross-section. Symmetrically arranged triangular reinforcing supports (first and second support plates) on both sides form a stable mechanical structure, evenly transmitting bending stress to the terminal body and preventing excessive local stress at the root. The wavy surface of the serpentine elastic arm (alternating convex and concave sections) dissipates bending energy through elastic deformation, reducing the stress amplitude transmitted to the root. Combined with a reasonable waveform size design, resonance failure is avoided, resulting in strong bending resistance. The elastic buffer layer on the outer side of the terminal root absorbs high-frequency impacts through viscoelastic deformation. Combined with the fixed connection design with the support plate, it attenuates and converts shear stress, significantly improving fatigue resistance in complex environments and comprehensively enhancing terminal reliability and service life. Attached Figure Description
[0016] Figure 1 This is a front view of the TYPE-C terminal pin reinforcement structure that resists bending stress according to this utility model.
[0017] Figure 2 This is a cross-sectional schematic diagram of a TYPE-C terminal pin reinforcement structure that resists bending stress according to this utility model.
[0018] Numbering on the map:
[0019] 1. Terminal body; 2. Pin; 201. Elastic buffer layer; 3. Elastic arm; 4. Stress dispersion area; 5. Reinforcing support; 501. First support plate; 502. Second support plate. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] like Figure 1-2 As shown, this utility model provides a reinforced structure for a TYPE-C terminal pin 2 that resists bending stress, including a terminal body 1 and a pin 2 disposed at the front end of the terminal body 1. The pin 2 includes a root connected to the terminal body 1 and an elastic arm 3 extending forward from the root. A stress dispersion zone 4 is provided at the connection between the root and the elastic arm 3. The thickness of the stress dispersion zone 4 gradually decreases along the extension direction of the pin 2. A reinforcing support member 5 is provided on the terminal body 1 at a position corresponding to the root. The reinforcing support member 5 is fixedly connected to the root and forms a triangular support structure.
[0022] In this embodiment, the stress dispersion zone 4 at the connection between the root of the terminal and the elastic arm 3 adopts a thickness gradient design, with a trapezoidal cross-section and a height that decreases from the root to the elastic arm 3. This gradient structure changes the stress concentration problem at the abrupt change in cross-section of the traditional pin 2: when the elastic arm 3 bends, the trapezoidal cross-section (narrow at the top and wide at the bottom) of the stress dispersion zone 4 can disperse the bending stress concentrated at the root layer by layer along the thickness direction. By gradually reducing the cross-sectional area, the stress distribution smoothly transitions from the high-rigidity region at the root to the flexible deformation region of the elastic arm 3, avoiding fatigue fracture caused by abrupt stress changes.
[0023] Furthermore, the cross-section of the stress dispersion zone 4 is trapezoidal, the width of the upper base of the trapezoid is smaller than the width of the lower base, and the height of the trapezoid gradually decreases from the root towards the elastic arm 3.
[0024] Finite element analysis shows that the trapezoidal cross-section design of stress dispersion zone 4 reduces the maximum equivalent stress at the root from 120MPa in the traditional structure to below 70MPa, and the stress concentration factor from 3.2 to 1.5, effectively reducing the probability of fatigue cracks in the material.
[0025] Furthermore, the reinforcing support 5 includes a first support plate 501 and a second support plate 502 integrally formed with the terminal body 1. The first support plate 501 and the second support plate 502 are symmetrically arranged on both sides of the pin 2, and the top ends of the first support plate 501 and the second support plate 502 are fixedly connected to the root.
[0026] The first support plate 501 and the second support plate 502, which are provided on the terminal body 1, are symmetrically distributed on both sides of the root of the pin 2 and fixedly connected to it, forming a stable triangular support structure. According to the principle of mechanics, a triangle has natural structural stability and can convert the lateral stress generated by the pin 2 during bending into the axial support force of the support plate.
[0027] Furthermore, the bottom ends of both the first support plate 501 and the second support plate 502 are flush with the bottom surface of the terminal body 1, and the heights of the first support plate 501 and the second support plate 502 are equal to the height of the pin 2. When the pin 2 is subjected to an external bending force, the stress is transmitted to the two support plates through the root. The design that the bottom ends of the support plates are flush with the bottom surface of the terminal body 1 ensures that the supporting force is evenly transmitted to the entire terminal body 1, avoiding stress concentration in the root connection area.
[0028] Furthermore, the elastic arm 3 has a serpentine structure, which includes a convex upper section and a concave section connected in sequence. The convex upper section and the concave section are alternately arranged, and the top surface of the convex upper section and the bottom surface of the concave section form a wavy curved surface.
[0029] The elastic arm 3 adopts a serpentine structure, consisting of alternating convex and concave sections forming a wavy surface. When the pin 2 is subjected to periodic bending, the serpentine structure converts external mechanical stress into elastic potential energy through the alternating elastic deformation of the convex and concave sections. Specifically, the convex sections (height 0.1-0.3mm) deform downwards under compression, while the concave sections (depth 0.2-0.5mm) deform upwards under tension. This reciprocating deformation of the wavy surface effectively dissipates bending energy and reduces the stress amplitude transmitted to the root.
[0030] Furthermore, the height of the convex section is 0.1-0.3 mm, the depth of the concave section is 0.2-0.5 mm, and the length of both the convex and concave sections is 0.5-1 mm. Simultaneously, controlling the length of the convex and concave sections to 0.5-1 mm ensures that the elastic arm 3 maintains a stable deformation cycle during high-frequency bending, avoiding structural failure caused by resonance effects.
[0031] Furthermore, an elastic buffer layer 201 is fitted around the base of pin 2. This elastic buffer layer 201 is made of silicone or rubber and has a thickness of 0.1-0.5 mm. The silicone / rubber elastic buffer layer 201 on the outer side of the base of pin 2 forms a dual stress buffer interface through its design of tightly fitting the base to the inner wall of the support plate. When an external impact force is applied to pin 2, the buffer layer first absorbs high-frequency vibration energy through the viscoelastic deformation of the material, reducing the transmission of instantaneous impact stress to the base.
[0032] Furthermore, the inner wall of the elastic buffer layer 201 is tightly fitted to the root of the pin 2, and the outer wall of the elastic buffer layer 201 is fixedly connected to the inner wall of the reinforcing support 5. This fixed connection between the outer wall of the buffer layer and the inner wall of the support plate constrains the buffer layer during lateral deformation, converting some stress into shear stress in the buffer layer. The shear modulus of the material further attenuates stress fluctuations, thereby protecting the root connection area from fatigue damage caused by high-frequency impacts.
[0033] In summary, the entire structure achieves coordinated operation through a three-dimensional design of "rigid support - flexible buffer - gradient transition": the reinforcing support 5 (rigid structure) provides static mechanical support to prevent plastic deformation at the root; the stress dispersion zone 4 (gradient structure) achieves a smooth transition between static and dynamic stresses, avoiding stress concentration; and the elastic arm 3 and the buffer layer (flexible structure) are responsible for absorbing and dissipating dynamic stress. The combination of these three components reduces the peak stress at the root of pin 2 by approximately 40%-60% (theoretical calculation value) when subjected to bending, and the wavy deformation of the elastic arm 3 can increase the number of bends to 2-3 times that of traditional structures.
[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A TYPE-C terminal pin reinforcement structure resistant to bending stress, comprising a terminal body and pins disposed at the front end of the terminal body, characterized in that, The pin includes a root connected to the terminal body and an elastic arm extending forward from the root. A stress dispersion area is provided at the connection between the root and the elastic arm. The thickness of the stress dispersion area gradually decreases along the extension direction of the pin. A reinforcing support is provided on the terminal body at a position corresponding to the root. The reinforcing support is fixedly connected to the root and forms a triangular support structure.
2. The TYPE-C terminal pin reinforcement structure for resisting bending stress according to claim 1, characterized in that: The cross-section of the stress dispersion zone is trapezoidal, the width of the upper base of the trapezoid is smaller than the width of the lower base, and the height of the trapezoid gradually decreases from the root towards the elastic arm.
3. The TYPE-C terminal pin reinforcement structure for resisting bending stress according to claim 1, characterized in that: The reinforcing support includes a first support plate and a second support plate integrally formed with the terminal body. The first support plate and the second support plate are symmetrically arranged on both sides of the pin, and the top of the first support plate and the second support plate are fixedly connected to the root.
4. The TYPE-C terminal pin reinforcement structure for resisting bending stress according to claim 3, characterized in that: The bottom ends of the first support plate and the second support plate are flush with the bottom surface of the terminal body, and the height of the first support plate and the second support plate is equal to the height of the pin.
5. The TYPE-C terminal pin reinforcement structure for resisting bending stress according to claim 1, characterized in that: The elastic arm has a serpentine structure, which includes a convex upper section and a concave section connected in sequence. The convex upper section and the concave section are alternately arranged, and the top surface of the convex upper section and the bottom surface of the concave section form a wavy curved surface.
6. The TYPE-C terminal pin reinforcement structure for resisting bending stress according to claim 5, characterized in that: The height of the convex section is 0.1-0.3mm, the depth of the concave section is 0.2-0.5mm, and the length of both the convex and concave sections is 0.5-1mm.
7. The TYPE-C terminal pin reinforcement structure for resisting bending stress according to claim 1, characterized in that: An elastic buffer layer is sleeved on the outer side of the root of the pin. The elastic buffer layer is made of silicone or rubber material and has a thickness of 0.1-0.5mm.
8. A TYPE-C terminal pin reinforcement structure resistant to bending stress according to claim 7, characterized in that: The inner wall of the elastic buffer layer is tightly fitted to the root of the pin, and the outer wall of the elastic buffer layer is fixedly connected to the inner wall of the reinforcing support.