Bent and straight dual-purpose radio frequency coaxial cable switching structure and radio frequency coaxial cable assembly

Abstract

The utility model discloses a bent and straight dual-purpose radio frequency coaxial cable switching structure and a radio frequency coaxial cable assembly. The switching structure comprises a joint body, a cable body, an inner sleeve and an outer sleeve. The inner sleeve sleeves the outer edge of the cable and abuts against the joint body, and the outer sleeve sleeves the outer edge of the inner sleeve; a first rack is arranged on the outer wall of the inner sleeve, and a second rack is arranged on the inner wall of the outer sleeve. The inner sleeve and the outer sleeve are both made of semi-flexible materials, flexibility can be provided when the cable is bent so as to achieve form switching, rigidity is achieved so that the posture can be stably kept after the cable is bent, and the cable is prevented from automatically restoring to be straight due to elasticity. The inner sleeve and the outer sleeve are meshed with each other to fix the form of the cable through locking force, and the cable can quickly return to a straight line and keep stable after unlocking. In addition, the inner and outer sleeves are independent of the connector body, and form change does not affect transmission quality of signals in the cable.

Description

TECHNICAL FIELD

[0001] The utility model relates to radio frequency coaxial device technical field especially relates to a kind of bend straight dual-purpose radio frequency coaxial cable switching structure and radio frequency coaxial cable assembly. BACKGROUND

[0002] Radio frequency coaxial cable (RF Coaxial Cable) is a kind of cable for transmitting radio frequency signals, usually composed of internal conductor, insulating layer, outer conductor (shield layer) and outer sheath, its structural characteristics is that center conductor is separated from outer conductor through insulating material, and outer conductor is usually metal braid or aluminum pipe, this structure can effectively reduce signal loss and interference. Radio frequency coaxial cable is widely used in high-frequency signal transmission, including communication, broadcasting, television, radar, electronic measurement and other fields.

[0003] Straight radio frequency coaxial cable refers to the cable with straight plug-in connectors at both ends, usually used in applications requiring stable and long-term transmission of radio frequency signals. The connectors of straight cable are directly inserted into the interface of equipment or system, and the connection mode is simple and reliable, usually used for direct connection between devices. Due to its simple structure, easy installation and stable signal transmission, straight radio frequency coaxial cable is widely used in communication base stations, television broadcasting, telecommunications networks, computer systems and radio frequency test equipment.

[0004] The utility model patent with authorization announcement number CN212849187U discloses a kind of radio frequency coaxial connector and radio frequency coaxial cable assembly, as shown in Figure 2 It includes: plug pin 100, dielectric body 200, outer conductor 300, connecting screw sleeve 400 and tail sleeve 500 are sequentially arranged from inside to outside, and the tail sleeve 500 and the outer conductor 300 form a moving space for the axial movement of the connecting screw sleeve 400, and the connecting screw sleeve 400 can move back and forth in the moving space.

[0005] Elbow radio frequency coaxial cable (also known as curved radio frequency coaxial cable) is a kind of cable with elbow connector (such as elbow adapter or elbow connector), commonly used in scenarios requiring frequent turning or wiring in limited space. Due to its built-in elbow structure, it can avoid signal loss and cable breakage in the bending area, and is widely used in space-limited devices and connection environments. Elbow radio frequency coaxial cable is usually used to connect antennas and receiving devices, communication devices and test instruments, and any situation that requires bending and maintaining signal stability of cable; this kind of cable has good flexibility, suitable for space-tight environment, such as wireless devices, mobile communication, antenna array and laboratory test equipment, which can effectively manage the bending problem of cable without affecting electrical performance.

[0006] The utility model discloses a practical new type of movable elbow radio frequency coaxial cable assembly, as shown in figure Figure 1 It includes: shell 1, cable 2, inner conductor 3, turning seat 4 and sealing ring 5, the shell 1 is equipped with the cable connection cavity 6 and the conductor turning cavity 7 that intercommunication, the cable connection cavity 6 extends along the vertical direction, the end of cable 2 is inserted into the cable connection cavity 6, and the inner core of cable 2 is exposed, and the inner core is electrically connected to the tail end of inner conductor 3. When the inner core is welded with the inner conductor 3, the turning seat 4 does not swing up and down, the inner conductor 3 is located in the conductor turning cavity 7, and an included angle is arranged between the inner conductor 3 and the cable 2, and the front end of the inner conductor 3 is slidably connected with the pin 15.

[0007] The radio frequency coaxial cable assembly disclosed by CN212849187U aims to move the connecting screw sleeve back and forth in the active space, but the radio frequency coaxial cable assembly can only be used as a straight head radio frequency cable assembly and cannot be bent, so the applicable scenarios are limited. Although the movable elbow radio frequency coaxial cable assembly disclosed by CN216872339U can flexibly adjust the installation position in the front, back, left and right directions, it still needs to determine the installation direction before installation, and cannot realize flexible conversion of the radio frequency coaxial cable between the elbow and the straight head.

[0008] It can be seen that the prior art urgently needs a cable switching structure and a radio frequency coaxial cable assembly that can be flexibly converted between the elbow and the straight head. Practical new type content

[0009] In view of the above problems, the purpose of the present utility model is to provide a bend straight dual-purpose radio frequency coaxial cable switching structure and a radio frequency coaxial cable assembly, aiming at solving the problem that the existing radio frequency coaxial cable assembly cannot be flexibly converted between the elbow and the straight head.

[0010] The technical scheme of the present utility model is as follows:

[0011] A bend straight dual-purpose radio frequency coaxial cable switching structure, comprising: a joint body and a cable body connected together, further comprising: an inner sleeve and an outer sleeve, the inner sleeve is sleeved on the outer edge of the cable body and abuts against the joint body, and the outer sleeve is sleeved on the outer edge of the inner sleeve; a first rack is arranged on the outer wall of the inner sleeve, a second rack is arranged on the inner wall of the outer sleeve, and the first rack and the second rack are engaged; the inner sleeve and the outer sleeve are both made of semi-flexible material to switch between bending and straightening.

[0012] The effect of the scheme is that the bending and straight dual-purpose RF coaxial cable switching structure can realize the free switching of the cable between bending and restoring straightness through the cooperation of the inner sleeve and the outer sleeve and the rack meshing. The inner sleeve is sleeved on the outer edge of the cable body and abuts against the joint body, and the outer sleeve is sleeved on the outer edge of the inner sleeve, and both are made of semi-flexible material. The design of the semi-flexible material makes the inner sleeve and the outer sleeve not only have enough flexibility when bending to ensure the switching of the cable form, but also have a certain rigidity after bending to stably maintain the bending posture without being affected by a large external force. This feature makes the cable not automatically restore to a straight state when bending due to elastic force, thereby improving the adaptability and stability of the cable in complex wiring. In addition, the first rack on the outer wall of the inner sleeve is meshed with the second rack on the inner wall of the outer sleeve, and the cable is fixed in the curved state through the rack locking force to avoid losing the curved form due to external force. After releasing the rack locking, the cable can quickly restore to a straight line and stably maintain. Since the inner sleeve and the outer sleeve are arranged on the outer edge of the cable body and are independent of the joint body, the change of the form of the cable will not affect the stable transmission of the signal, thereby ensuring the signal quality and transmission efficiency of the cable in any state. Therefore, the utility model not only realizes the free switching of the cable form, meets the complex wiring demand, but also improves the durability, flexibility and stability of the cable, and avoids the signal attenuation problem caused by unstable form in the traditional cable design.

[0013] In a further preferred scheme, the outer sleeve comprises two sleeve plates, which are semi-circular annular, and the two sleeve plates are spliced to form a circular annular outer sleeve body.

[0014] The effect of the scheme is that by designing the outer sleeve to be spliced from two semi-circular annular sleeve plates, the installation process of the outer sleeve can be simplified, and the operability and precision in the production process can be improved. The splicing structure not only facilitates production and assembly, but also can better control the size and shape of the outer sleeve, ensure good cooperation with the inner sleeve and the cable body, and enhance the stability of the overall structure. In addition, the circular annular structure of the outer sleeve ensures the protection of the cable outside and can be effectively connected with the inner sleeve through the rack meshing mechanism, thereby ensuring the smooth switching of the cable between bending and restoring straightness. Due to the independence of the inner sleeve and the outer sleeve structure, there is no adverse effect on the internal signal transmission of the cable, and the stable transmission of the signal of the cable in any working state is ensured.

[0015] In a further preferred scheme, the two sleeve plates are fixedly connected through a fixing ring after splicing.

[0016] The effect of the above scheme is that the two half sleeve plates are firmly connected by using the fixing ring, which can ensure that the structure of the outer sleeve is more stable and durable. The application of the fixing ring can effectively prevent the sleeve plate from loosening or shifting due to external force or long-term stress during use, ensuring the connection strength and reliability of the entire outer sleeve. Compared with the traditional buckle or welding connection method, the fixing ring not only provides sufficient fixing force, but also simplifies the installation process, improves production efficiency and assembly convenience. In addition, the design of the fixing ring also considers aesthetics and functionality, ensuring the uniformity of the product appearance and enhancing the bending resistance of the outer sleeve. In actual use, when the cable needs to switch states, the fixing ring can ensure that the outer sleeve does not deform when subjected to bending force, ensuring the stability of the cable form and reliably maintaining the bending posture. Therefore, the above setting not only improves the flexibility of the bendable and straightable RF coaxial cable, but also improves its stability and durability during long-term use.

[0017] In a further preferred scheme, the outer sleeve is made of TPU and is processed by injection molding.

[0018] The effect of the above scheme is that the above setting fully utilizes the flexibility and durability characteristics of TPU material, allowing the outer sleeve to maintain sufficient elasticity when bent, thereby better fitting the inner sleeve and the cable body, ensuring that the outer sleeve does not permanently deform or damage during switching. At the same time, the high tear resistance and wear resistance of TPU improve the durability of the outer sleeve, which can withstand multiple bending and straightening switching actions for a long time. Through the injection molding processing method, the outer sleeve can be accurately formed, ensuring the meshing accuracy of the first rack and the second rack, thereby further enhancing the stability in the bent state. In addition, the smooth surface characteristics of TPU material consider the aesthetics of the appearance and the convenience during use, allowing the outer sleeve to provide functionality while having a compact overall structure and good texture.

[0019] In a further preferred scheme, the inner sleeve is made of nylon and is processed by injection molding.

[0020] The effect of the above scheme is that the nylon material has excellent mechanical strength and rigidity, which can ensure that the inner sleeve has sufficient structural stability when supporting the cable body and carrying the outer sleeve, and can maintain the characteristics of not deforming and not breaking during multiple bending and straightening switching processes. At the same time, the wear resistance and low friction coefficient of nylon facilitate smoother meshing of the rack with the outer sleeve, avoiding wear or poor meshing problems caused by long-term use. In addition, the heat resistance and chemical stability of nylon material make it suitable for use in various complex environments, such as high temperature or corrosive environment, thereby improving the application range of the assembly. Through injection molding process, the inner sleeve can be accurately formed, effectively ensuring the accuracy and consistency of the rack size, thereby improving the reliability and stability of the meshing of the first rack and the second rack.

[0021] In a further preferred embodiment, the inner sleeve is interference-fitted with the cable body.

[0022] The advantages of the above solution are as follows: Through interference fit, the inner sleeve can tightly fit the cable body, providing reliable fixing force after installation and avoiding the risk of component failure due to loosening or slippage. The interference fit design allows the inner sleeve to effectively transmit the bending force of the cable body, and through the synergistic effect of the inner and outer sleeves, the cable remains stable under bending conditions. Simultaneously, the interference fit effectively suppresses the vibration of the cable body when subjected to external impact, preventing relative displacement between the inner and outer sleeves, thereby further ensuring the reliability and stability of the rack and pinion engagement. Furthermore, the interference fit connection method eliminates the need for additional fasteners or adhesives, simplifying the installation process, reducing processing and assembly costs, and improving the overall durability and service life of the structure.

[0023] In a further preferred embodiment, the teeth on the first rack are smaller than the teeth on the second rack, and the outer sleeve is swayably fitted onto the outer edge of the inner sleeve.

[0024] The advantages of the above solution are as follows: The aforementioned design effectively reduces frictional resistance during rack engagement, while simultaneously improving the sensitivity of rack engagement. This allows the outer sleeve to move flexibly around the outer edge of the inner sleeve, adapting to different bending conditions. Furthermore, the outer sleeve can be swayed around the outer edge of the inner sleeve, avoiding complex fixing structures and allowing the outer sleeve to maintain a certain degree of freedom in the unlocked state. This enables it to naturally adapt to minor cable deformations, preventing rack disengagement or material damage due to excessive rigidity. Simultaneously, the swaying design provides strong fixing force through rack engagement when locked, while allowing for quick adjustment in the unlocked state, enhancing structural flexibility and ease of operation.

[0025] In a further preferred embodiment, a gap is reserved between the tooth crest of the first rack and the bottom wall of the tooth groove of the second rack, the height of the gap being between 5% and 10% of the tooth pitch.

[0026] The above solution achieves the following effects: A gap is pre-installed between the tooth crest of the first rack and the bottom wall of the tooth groove of the second rack, effectively reducing jamming problems caused by machining errors or assembly deviations during meshing, thus improving assembly smoothness and structural reliability. The height of the gap is limited to 5% to 10% of the tooth pitch, ensuring a balance between tightness and flexibility in rack meshing: on the one hand, this gap provides sufficient tolerance space for rack operation, preventing excessive contact that could lead to rack wear or difficulty in switching; on the other hand, the controlled range of this gap ensures locking stability after rack meshing, allowing the inner and outer sleeves to maintain a fixed posture without slipping in both bent and straight states. Furthermore, the gap effectively alleviates frictional resistance caused by external forces during switching, further extending the service life of the rack and sleeve.

[0027] In a further preferred embodiment, the teeth of both the first and second racks are involute-shaped.

[0028] The advantages of the above solution are as follows: Firstly, the involute tooth profile provides a larger contact area and a gradually rolling meshing method, effectively reducing the coefficient of friction during meshing, making the inner and outer sleeves switch states more smoothly and reducing the operating resistance required by external forces. Secondly, the involute tooth profile has self-locking characteristics, providing high locking stability after meshing, ensuring that the inner and outer sleeves remain reliably fixed in bending or straight states, and are not prone to slippage due to vibration or slight external forces. In addition, the involute tooth profile can evenly distribute the load, avoiding local stress concentration in the rack, thereby extending the service life of the rack structure.

[0029] A radio frequency (RF) coaxial cable assembly includes the bendable / straight-use RF coaxial cable switching structure described above. Since the RF coaxial cable assembly incorporates all the technical features of the aforementioned bendable / straight-use RF coaxial cable switching structure, it also possesses all the technical effects of the aforementioned bendable / straight-use RF coaxial cable switching structure, and will not be elaborated further.

[0030] Compared with existing technologies, the dual-purpose (bending and straight) RF coaxial cable switching structure provided by this utility model includes a connector body, a cable body, an inner sleeve, and an outer sleeve. The inner sleeve is fitted onto the outer edge of the cable and abuts against the connector body, while the outer sleeve is fitted onto the outer edge of the inner sleeve. A first toothed rack is provided on the outer wall of the inner sleeve, and a second toothed rack is provided on the inner wall of the outer sleeve; the two are engaged. Both the inner and outer sleeves are made of semi-flexible material, providing flexibility for form switching when the cable is bent, while also possessing rigidity to maintain a stable posture after bending, preventing the cable from automatically returning to a straight line due to elasticity. The toothed design of the inner and outer sleeves engaging fixes the cable shape through locking force; after unlocking, the cable can quickly return to a straight line and remain stable. Furthermore, the inner and outer sleeves are independent of the connector body, and changes in shape do not affect the transmission quality of signals inside the cable. This utility model achieves free switching between bent and straight cable states, enhancing adaptability and stability, meeting complex wiring requirements, while avoiding signal attenuation problems caused by unstable shape in traditional designs, thus improving durability and flexibility of use. Attached Figure Description

[0031] Figure 1 This is a structural diagram of the radio frequency coaxial cable assembly in CN212849187U.

[0032] Figure 2 This is a structural schematic diagram of the movable elbow radio frequency coaxial cable assembly in CN216872339U.

[0033] Figure 3 This is a cross-sectional view of the bending and straight-use radio frequency coaxial cable switching structure provided by this utility model.

[0034] Figure 4 This is a cross-sectional view of the inner sleeve in a bent state in this utility model.

[0035] Figure 5 This is a cross-sectional view of the outer sleeve in a bent state in this utility model.

[0036] Figure 6 This is an exploded view of the inner sleeve and outer sleeve in this utility model. Detailed Implementation

[0037] This utility model provides a switching structure for both straight and bent radio frequency coaxial cables and a radio frequency coaxial cable assembly. To make the purpose, technical solution and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples.

[0038] This utility model provides a dual-purpose (bendable and straight) radio frequency coaxial cable switching structure, mainly composed of a connector body 100, a cable body (not shown), an inner sleeve 310, and an outer sleeve 320. Figure 3As shown, the inner sleeve 310 is fitted onto the outer edge of the cable body and abuts against the connector body 100, while the outer sleeve 320 is fitted onto the outer edge of the inner sleeve 310. The outer wall of the inner sleeve 310 is provided with a first toothed rack 321 (e.g., ...). Figure 4 As shown), the inner wall of the outer sleeve 320 is provided with a second rack 311 that meshes with it (as shown). Figure 5 As shown, the rack and pinion design of both components creates a reliable mechanical lock. When bending the cable, external force bends the inner and outer sleeves 320 together with the cable body. The first rack 321 and the second rack 311 remain engaged, and the mechanical locking force of the racks stabilizes the bent posture. When restoring the straight state, the rack lock is released, and the cable body quickly straightens and remains stable using the elasticity of the semi-flexible material of the inner and outer sleeves 320. This dual-purpose (bending and straightening) RF coaxial cable switching structure achieves reliable maintenance of the bent state through rack engagement. During bending, the mechanical lock of the racks effectively prevents spontaneous straightening caused by the cable's elasticity, while ensuring that the bent shape is not easily changed by external force disturbances. The strength of the rack engagement and the combination of the semi-flexible material make the switching operation both stable and smooth. During the straightening process, the semi-flexible material of the inner and outer sleeves 320 provides sufficient elasticity, allowing for rapid straightening without complex operations. Furthermore, the inner and outer sleeves 320 are independent of the connector body 100 and will not interfere with the stable transmission of radio frequency signals, ensuring high-quality signal transmission of the cable under any conditions. This invention not only enables free switching of cable configurations to meet complex wiring needs, but also improves the cable's durability and flexibility of use.

[0039] The structure of a radio frequency coaxial cable includes: an inner conductor ( Figure 3 210 is the receiving hole for the inner conductor, usually made of copper or copper alloy, and the insulating medium ( Figure 3 The 220 is a accommodating hole for the insulating medium, typically made of PTFE or PE, and a shielding layer ( Figure 3 The middle 230 is the receiving hole of the shielding layer (woven mesh or foil, usually copper or aluminum) and the outer sheath ( Figure 3 240 is the receiving hole for the outer sheath, usually made of PVC or TPU.

[0040] Assuming the maximum bending radius R of the cable min Given the bending length L, the deformation is mainly concentrated in the sheath, shielding layer, and insulating medium. Therefore, the deformation caused by bending can be estimated using the bending strain formula:

[0041] Where t is the material thickness, R min The radius of curvature is denoted as .

[0042] Based on the Young's modulus E and deformation ∈ , the stress formula is as follows: σ=E*∈ . The Young's modulus of each material is as follows: PTFE: 0.4×10 9Pa, PVC: 2-4×10 9 Pa, copper: 1.1 × 10 11 Pa.

[0043] The elastic force F is related to the stress and the area A on which the force is applied. The formula is: F=σ*A, and the area on which the force is applied is A=L*t, where L is the cable length and t is the thickness of the bending layer.

[0044] In summary, based on cable materials and geometric parameters, the elasticity range of common radio frequency coaxial cables is typically between 10-50N.

[0045] Radio frequency coaxial cables exhibit a wide range of elastic force (10-50N) when bent, meaning the cable body has a strong tendency to return to a straight shape. Without a proper fixing or restraining structure, the cable cannot stably maintain its bent posture during complex wiring, affecting the flexibility of the wiring and the space utilization of the equipment. The switching structure provided by this utility model provides a reliable locking force through the meshing rack of the inner and outer sleeves 320, enabling the cable to overcome its own elasticity and stably maintain its bent state after bending. The inner and outer sleeves 320 are made of semi-flexible materials (such as TPU or nylon), which can generate moderate deformation during bending, conforming to the shape changes of the cable, while providing sufficient rigidity to support the locking structure. Specifically, when bending the cable, the semi-flexible material can adapt to the stress distribution in different parts during bending, avoiding excessive compression or stretching of the cable surface and extending the cable life. Moreover, the elastic modulus of the semi-flexible material matches the cable's elasticity, allowing the rack meshing force to effectively resist the cable's restoring force, ensuring that the cable will not spontaneously return to a straight state without external force.

[0046] In a further preferred embodiment of this utility model, the outer sleeve 320 is composed of two semi-circular sleeve plates (e.g., Figure 6 As shown, Figure 6Both 310a and 310b are sleeve plates. These two sleeve plates are joined together to form a complete annular outer sleeve 320. Since the sleeve plates are independent semi-circular components, their production and processing are more convenient, reducing the complexity that might arise from one-piece molding. Simultaneously, the joining method makes assembly more flexible, eliminating the need for forced manipulation of the cable during installation, reducing construction difficulty and improving efficiency. Secondly, this design enhances the controllability of the outer sleeve 320's size and shape. By joining precision-manufactured sleeve plates, the overall precision of the annular outer sleeve 320 can be more effectively controlled, ensuring a tight fit with the inner sleeve 310 and the cable body, improving the stability between components, and enabling the inner and outer sleeves 320 to more reliably switch between bending and straightening states. Furthermore, the annular outer sleeve 320 structure provides comprehensive protection, covering the outside of the cable and preventing damage from external forces or environmental factors. Meanwhile, the outer sleeve 320, through the meshing of its inner wall rack with the outer wall rack of the inner sleeve 310, ensures stability in a bent state and smoothness when returning to a straight state. Finally, the independent design between the inner and outer sleeves 320 ensures that the external protective structure will not interfere with the signal transmission inside the cable. Whether the cable is in a bent state or returning to a straight state, its signal transmission can maintain high quality and high efficiency, thus meeting the usage requirements in multiple scenarios.

[0047] Furthermore, the two sleeve plates are connected and secured using retaining rings after splicing. The use of retaining rings firmly binds the two sleeve plates together, enhancing the overall structural stability and durability of the outer sleeve 320. Under external forces or long-term use, the retaining rings effectively prevent loosening or displacement of the sleeve plates, ensuring reliable connection strength of the outer sleeve 320 and reducing the possibility of structural failures. Secondly, compared to traditional snap-fit ​​or welding connections, the application of retaining rings offers greater ease of operation. The retaining rings provide sufficient fixing force while simplifying the installation process, improving production efficiency and assembly convenience. The design of the retaining rings also considers the product's aesthetic requirements, making the surface of the outer sleeve 320 smoother and more uniform, achieving a balance between aesthetics and practicality. In addition, the addition of retaining rings further enhances the bending resistance of the outer sleeve 320. During the transition between straight and bent states of the cable, the outer sleeve 320 maintains its shape stability under the action of the retaining rings, preventing excessive deformation due to bending forces, thus ensuring a smooth and stable cable shape transition. When bent, the structural support of the retaining ring allows the cable to maintain the set bending posture, meeting the actual needs of complex wiring.

[0048] In practical implementation, the outer sleeve 320 is made of TPU material and processed using injection molding. This design fully leverages the flexibility and durability of TPU material, providing ample elastic support during bending, effectively conforming to the inner sleeve 310 and the cable body. This ensures that the outer sleeve 320 will not undergo permanent deformation or damage due to stress during switching, maintaining structural integrity and functional stability. Furthermore, the high tear resistance and abrasion resistance of TPU ensure that the outer sleeve 320 retains good durability even after multiple bending and straightening transitions, meeting the requirements for long-term use. Through injection molding, the outer sleeve 320 can achieve high-precision molding, ensuring a precise fit between its dimensions and rack structure and the inner sleeve 310. This improves the accuracy of the meshing between the first rack 321 and the second rack 311, further enhancing locking stability under bending conditions and reducing resistance during cable shape transitions. In addition, the smooth surface and pleasant feel of the TPU material not only enhance the aesthetics of the outer sleeve 320 but also improve the convenience and comfort during installation and use.

[0049] Specifically, the inner sleeve 310 is made of nylon material and manufactured using injection molding. Nylon material, with its excellent mechanical strength and rigidity, provides reliable structural support for the inner sleeve 310, maintaining good stability while bearing the cable body and the outer sleeve 320. Under repeated bending and straightening switching conditions, the high fatigue resistance of nylon ensures that the inner sleeve 310 will not deform or break due to stress, significantly extending its service life. Furthermore, the wear resistance and low coefficient of friction of nylon make its meshing with the rack of the outer sleeve 320 smoother, effectively reducing wear and poor meshing problems that may occur during long-term use, ensuring smooth switching operations. At the same time, nylon material has good heat resistance and chemical stability, enabling it to adapt to complex environments such as high temperature, humidity, or corrosiveness, expanding the application scenarios of the entire structure. Through injection molding, the inner sleeve 310 can be precision manufactured, ensuring the accuracy and consistency of its dimensions and rack structure, thereby improving the reliability of the meshing between the first rack 321 and the second rack 311, making the switching process more stable and smooth.

[0050] Preferably, the inner sleeve 310 is connected to the cable body using an interference fit. The interference fit ensures that the inner sleeve 310 fits tightly against the cable body, providing sufficient fixing force. This prevents the inner sleeve 310 from loosening or slipping during use, which could lead to performance degradation or failure of the component. The inner sleeve 310 can firmly transmit the bending force of the cable body, and combined with the cooperation of the outer sleeve 320, ensures the cable maintains a stable shape under bending conditions. Furthermore, the tight fit effectively suppresses displacement of the cable body when subjected to external impact or vibration, fundamentally reducing the relative slippage between the inner and outer sleeves 320, further ensuring the accuracy and stability of the rack and pinion engagement. This connection method eliminates the need for additional fasteners or adhesives, significantly simplifying the assembly process, improving production efficiency, and reducing manufacturing and assembly costs. Simultaneously, the stability of the interference fit makes the overall structure more durable, capable of withstanding repeated bending and straightening actions over a long period, thus improving the product's service life and reliability.

[0051] Preferably, the tooth size of the first rack 321 is smaller than that of the second rack 311, and the outer sleeve 320 is movably fitted onto the outer edge of the inner sleeve 310. This arrangement effectively reduces the frictional resistance during rack engagement through the difference in tooth size, thereby improving the sensitivity of rack engagement and making the movement of the outer sleeve 320 on the outer edge of the inner sleeve 310 smoother and more flexible. This allows the outer sleeve 320 to better adapt to various bending states of the cable and meet the needs of different application scenarios. At the same time, the movable fitting design eliminates the need for a complex fixing structure, giving the outer sleeve 320 a certain degree of freedom in the unlocked state, allowing it to adjust naturally with the slight deformation of the cable, avoiding problems such as poor rack engagement or material damage due to excessive rigidity. In addition, in the locked state, rack engagement can provide sufficient fixing force to ensure the stability of the outer sleeve 320 in the bending state. In the unlocked state, the outer sleeve 320 can be quickly adjusted to the appropriate position, which facilitates operation and improves switching efficiency. This not only enhances the flexibility and adaptability of the structure, but also simplifies the assembly process while ensuring the stability and durability of the overall performance, providing strong support for the optimization of the bending-to-straight switching structure.

[0052] According to another aspect of this utility model, a certain gap is provided between the tip of the tooth of the first rack 321 and the bottom wall of the tooth groove of the second rack 311, and the height of this gap is controlled within the range of 5% to 10% of the tooth pitch. This arrangement, by pre-leaking a gap between the tip of the tooth and the bottom wall of the tooth groove, significantly reduces rack jamming caused by manufacturing errors or assembly deviations, thereby improving the smoothness of structural assembly and the reliability of operation. The limitation of the gap height range fully considers the balance between tightness and flexibility: the 5% to 10% gap provides the necessary tolerance space for operation, avoiding poor meshing or switching difficulties caused by excessive tight contact, while ensuring that the rack remains stable in the locked state after meshing, preventing loosening from affecting the functionality of the switching structure. Furthermore, this gap can reduce the frictional resistance caused by external forces during switching, reducing wear between the rack and the sleeve, thereby extending the service life of the component. At the same time, the reasonable gap setting allows the inner and outer sleeves 320 to maintain good positioning and fit in both bending and straight states, further improving the stability and durability of the overall structure.

[0053] Furthermore, the teeth of both the first rack 321 and the second rack 311 are involute-shaped. The involute tooth shape provides a larger contact area and a gradually rolling meshing mechanism, effectively reducing the coefficient of friction during meshing. This makes the inner and outer sleeves 320 switch states more smoothly, reducing the resistance required for external operation and making the switching operation easier and smoother. Secondly, the involute tooth shape has self-locking properties, providing high locking stability after meshing. Whether in a bent or straight state, the inner and outer sleeves 320 can maintain a stable position and will not slip due to slight external vibrations or forces, thus ensuring the reliability of the structure. Finally, the involute tooth shape design facilitates the even distribution of load on the rack, avoiding excessive local stress concentration, reducing damage to the rack caused by stress concentration, and further extending the service life of the rack and the overall structure.

[0054] This utility model also provides a radio frequency coaxial cable assembly, which includes the bending-and-straightening radio frequency coaxial cable switching structure described above. Since the radio frequency coaxial cable assembly includes all the technical features of the bending-and-straightening radio frequency coaxial cable switching structure, it also possesses all the technical effects of the bending-and-straightening radio frequency coaxial cable switching structure, and will not be elaborated further.

[0055] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of this invention and form different embodiments; for example, any one of the claimed embodiments can be used in any combination.

[0056] It should be noted that the above embodiments are illustrative of the present invention and not restrictive of it, and those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A switching structure for a bendable and straight-compatible radio frequency coaxial cable, comprising: The connector body and cable body connected together are characterized in that they further include: an inner sleeve and an outer sleeve, wherein the inner sleeve is sleeved on the outer edge of the cable body and abuts against the connector body, and the outer sleeve is sleeved on the outer edge of the inner sleeve; a first toothed rack is provided on the outer wall of the inner sleeve, and a second toothed rack is provided on the inner wall of the outer sleeve, wherein the first toothed rack and the second toothed rack mesh with each other; both the inner sleeve and the outer sleeve are made of a semi-flexible material to switch between bending and straightening.

2. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 1, characterized in that, The outer sleeve includes two sleeve plates, which are semi-circular in shape, and the two sleeve plates are joined together to form a circular outer sleeve body.

3. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 2, characterized in that, The two sleeve plates are spliced ​​together and then fixedly connected by a retaining ring.

4. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 1, characterized in that, The outer sleeve is made of TPU and is processed by injection molding.

5. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 1, characterized in that, The inner sleeve is made of nylon and is formed by injection molding.

6. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 1, characterized in that, The inner sleeve is interference-fitted with the cable body.

7. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 1, characterized in that, The teeth on the first rack are smaller than the teeth on the second rack, and the outer sleeve can be swayed and fitted onto the outer edge of the inner sleeve.

8. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 7, characterized in that, A gap is reserved between the tooth crest of the first rack and the bottom wall of the tooth groove of the second rack, and the height of the gap is between 5% and 10% of the tooth pitch.

9. The dual-purpose (bendable and straight) radio frequency coaxial cable switching structure according to claim 8, characterized in that, The teeth of both the first and second racks are involute-shaped.

10. A radio frequency coaxial cable assembly, characterized in that, Includes the bending and straight-use radio frequency coaxial cable switching structure as described in any one of claims 1 to 9.

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