Front windshield lower clamping strip

Abstract

The present application relates to the field of card strip, especially to a front windshield lower card strip, comprising: a cover plate, one end of which is provided with a clamping rib, and the end of the clamping rib is provided with a bending part; a card strip, provided with a U-shaped mounting groove formed by a vertical rib side wall, a bottom wall and a bearing rib; the bearing rib is arranged opposite to the vertical rib side wall to form an open end of the mounting groove; the end of the hard rib is provided with a soft clamping joint, when inserted into the mounting groove, one side of the bending part abuts against the vertical rib side wall, and the other side tightly clamps the soft clamping joint with the open end of the bearing rib, so that the soft clamping joint and the hard bearing rib superimpose the bending part to exert force and form a stable clamping, and the vibration of the clamping rib pushes the soft clamping joint to move and deform in the direction of the bearing rib, and the clamping rib does not contact the bearing rib. The present application realizes that the clamping is not simply relying on the soft component to exert force on the cover plate, and the vibration of the cover plate will not directly collide with the hard groove side wall to produce abnormal noise.

Description

Technical Field

[0001] This invention relates to the field of card strips, and more particularly to a card strip under the windshield. Background Technology

[0002] The lower windshield retaining strip is a key connecting component between the windshield and the dashboard cover, primarily serving to secure the connection, provide waterproofing, and reduce vibration and noise. It not only prevents rainwater and dust from entering the vehicle through the gap between the windshield and the ventilation cover, but also effectively suppresses wind noise generated during vehicle operation, improving driving comfort.

[0003] Currently, most common windshield under-shield retaining strips on the market adopt a rigid barbed snap-fit ​​structure. This structure uses barbed snap-fit ​​parts on the strip to achieve a fixed connection with the clips or slots on the ventilation cover through an interference fit. To ensure sufficient snap-fit ​​strength and installation stability, and to prevent loosening, detachment, or abnormal noise during vehicle operation, existing technologies typically increase the interference of the barbs and the snap-fit ​​force.

[0004] However, this traditional snap-fit ​​structure presents an irreconcilable technical contradiction: the greater the snap-fit ​​force, the better the installation stability, but the difficulty of disassembly also increases significantly. During vehicle maintenance, when it is necessary to remove the cover for inspection, repair personnel usually need to use tools such as plastic pry bars to forcibly pry open the snap-fit ​​parts. This is not only cumbersome and time-consuming, but also very likely to damage the snap-fit ​​structure.

[0005] Therefore, to solve the problem of the rigid snap-fit ​​structure of common windshield grille sealing strips, most methods add soft components to the snap-fit ​​structure to facilitate disassembly. For example, invention patent CN111452736B discloses a car air intake grille sealing strip with a soft hollow structure. Specifically, it discloses a single piece of soft structure set on one side wall of a U-shaped groove. This side wall lacks a rigid fixing structure to cooperate with the soft structure, resulting in the strip relying solely on the deformation of the soft structure to insert and remove the grille cover. Since the soft structure needs to ensure both insertion and removal performance, its stiffness against elastic deformation must be relatively high, making it impossible to insert and remove the cover with minimal force, thus still presenting difficulties in disassembling and installing the cover. Furthermore, when the cover is in the groove, due to reasonable tolerances in the manufacturing and deformation of the soft structure, visible gaps can easily form between the cover and the strip, causing the cover to loosen.

[0006] For example, patent document CN102036844A discloses a profile component for connecting a car window glass to a water tank. Specifically, it discloses a positioning element that can elastically deform within the groove of the retaining strip. However, it clearly states that the positioning element is located on the end face of the supporting rib and forms an acute angle with the pushing direction of the water tank cover. This causes the component of the pushing force generated on the contact surface with the positioning element when the water tank cover vibrates to move inwards towards the groove. Consequently, significant vibrations of the water tank cover can push the positioning element completely into the groove and into contact with the supporting rib, generating a collision noise. Furthermore, the water tank cover is inserted and removed solely through the deformation of the soft positioning element, and the water tank cover is only secured within the groove by the soft positioning element, inevitably leading to loosening of the water tank cover.

[0007] Therefore, how to improve the setting structure of the soft component in the under-windshield retaining groove so as to achieve the retaining without relying solely on the soft component to apply force to the cover plate, and also to prevent the vibration of the cover plate from directly colliding with the hard groove sidewall and generating abnormal noise, is a technical problem that needs to be solved. Summary of the Invention

[0008] To address this, the present invention provides a front windshield retaining strip to overcome the problems in the prior art where the structure of the soft component in the front windshield retaining strip groove cannot be improved, thus making it impossible to achieve a retaining action on the cover plate without relying solely on the soft component, and also preventing the vibration of the cover plate from directly colliding with the hard groove sidewall and generating abnormal noise.

[0009] To achieve the above objectives, the present invention proposes a windshield under-stripping strip, comprising: The cover plate has a snap-fit ​​rib at one end, and the end of the snap-fit ​​rib has a bent portion; The clip has a U-shaped mounting groove formed by the side wall of the vertical rib, the bottom wall and the load-bearing side wall; The bottom wall or load-bearing side wall is provided with rigid ribs, the load-bearing side wall is provided with load-bearing ribs, and the load-bearing ribs and the vertical rib side walls are provided with open ends to form installation grooves. The end of the rigid rib is provided with a flexible snap-fit ​​connector. The flexible snap-fit ​​connector covers the side surface of the bearing rib facing the open end. When the snap-fit ​​rib is inserted into the mounting groove, the bending part pushes the flexible snap-fit ​​connector to bend and deform into the mounting groove. One side of the bending part abuts against the side wall of the upright rib, and the other side tightly clamps the flexible snap-fit ​​connector with the open end of the bearing rib. This allows the flexible snap-fit ​​connector and the rigid bearing rib to exert superimposed force on the bending part and form a stable snap-fit. Furthermore, the center line of the flexible snap-fit ​​connector is set at a certain angle to the center line of the snap-fit ​​rib so that when the snap-fit ​​rib vibrates, it pushes the flexible snap-fit ​​connector to move and deform in the direction of the bearing rib, while maintaining a gap between the snap-fit ​​rib and the bearing rib. The centerline of the rigid rib is set at a second angle relative to the centerline of the snap-fit ​​rib, so that when the flexible snap-fit ​​connector at the end of the rigid rib is subjected to bending action, it tends to bend towards the opening end rather than towards the inside of the mounting groove.

[0010] Furthermore, the method for determining the first angle and the second angle includes: Construct finite element simulation models of the cover plate and the retaining strip; Input the first angle to be optimized and the second angle to be optimized into the finite element simulation model to generate simulation mechanical parameters; The first angle to be optimized, the second angle to be optimized, the simulation mechanical parameters, and the material strength of the flexible clamp are used to determine the first angle and the second angle through an optimization model; The optimization model is a non-dominated sorting genetic algorithm architecture, which has a snap-in stability reference point and a plug-in / plug-out convenience reference point to determine the first angle and the second angle of snap-in stability bias, and the first angle and the second angle of plug-in / plug-out stability bias, respectively.

[0011] Furthermore, the process of generating simulation mechanical parameters from the finite element simulation model includes: In the finite element simulation model, a quasi-static displacement in the insertion direction is applied to the cover plate to generate the peak insertion force; In the finite element simulation model, a displacement excitation is applied to the cover plate to generate the relative displacement amplitude between the bent part and the bearing rib, as well as the contact pressure of the bent part; In the finite element simulation model, a quasi-static displacement in the pull-out direction is applied to the cover plate to generate the peak values ​​of the snap-fit ​​static holding force and the pull-out force of the bent portion; The simulated mechanical parameters include peak insertion force, relative displacement amplitude, contact pressure at the bend, static holding force of the snap-fit, and peak pull-out force.

[0012] Furthermore, the process of optimizing the model to determine the first angle and the second angle includes: The objective function is constructed based on minimizing the peak insertion force, maximizing the relative displacement amplitude, maximizing the contact pressure at the bend, maximizing the static holding force of the snap-fit, and minimizing the peak pull-out force. Treating the first angle to be optimized and the second angle to be optimized as individuals, calculate their corresponding non-dominated rankings; Based on the simulated mechanical parameters, the reference point for stable clamping, and the reference point for easy insertion and removal, the improved crowding distance corresponding to each individual is calculated, and a genetic iteration operation is performed to determine the first angle and the second angle as the optimal solution.

[0013] Furthermore, the snap-fit ​​stability reference point includes the historical maximum value of the snap-fit ​​static holding force, the historical minimum value of the relative displacement amplitude, and the historical minimum value of the contact pressure at the bend. The reference points for easy insertion and removal include the historical minimum value of peak insertion force, the historical minimum value of insertion work, and the historical minimum value of peak extraction force.

[0014] Furthermore, the length of the flexible snap-fit ​​connector is less than the length of the rigid rib; When the flexible snap-fit ​​connector does not undergo bending deformation, it has a tongue-shaped structure that gradually widens outward from the end of the rigid rib.

[0015] Furthermore, the side wall of the upright rib is a planar structure. When the snap-fit ​​rib is pulled out of the mounting groove, the bending part pushes the flexible snap-fit ​​connector to fit tightly against the bearing rib, and the bending part pushes the side wall of the upright rib to bend, so that the bending part moves out of the mounting groove.

[0016] Furthermore, the feature is that a first reinforcing rib is provided inside the sidewall of the vertical rib, and the length of the first reinforcing rib inside the sidewall of the vertical rib is less than the length of the sidewall of the vertical rib. The first reinforcing rib extends from the side wall of the vertical rib to the bottom wall and the load-bearing side wall.

[0017] Furthermore, the load-bearing sidewall extends away from the mounting groove to form a load-bearing section of the clip, which, together with the load-bearing rib, securely installs the windshield.

[0018] Furthermore, the interior of the supporting rib is provided with a second reinforcing rib, and the area where the supporting rib contacts the cover plate is provided with a soft buffer.

[0019] Compared with the prior art, the beneficial effects of the present invention are that it adopts a three-layer clamping structure of bending section, flexible clamping joint, and bearing rib, which can withstand the severe vibration and impact during vehicle operation and will not loosen or fall off after long-term use. Furthermore, in the clamped state, there is never direct contact between the clamping rib and the bearing rib, eliminating the collision noise caused by vibration at its source.

[0020] In particular, this invention uses a non-dominated sorting genetic algorithm to perform multi-objective optimization on two angle parameters, which can generate parameters with both snap-fit ​​stability bias and insertion / removal convenience bias to meet the needs of different scenarios. It can simultaneously consider multiple conflicting design objectives such as snap-fit ​​stability and insertion / removal convenience, automatically generate the optimal angle, provide designers with a scientific basis for decision-making, and shorten the product development cycle of the card strip. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the lower windshield retaining strip according to an embodiment of the present invention; Figure 2This is a schematic diagram of the angle structure of the lower windshield retaining strip according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of another embodiment of the lower windshield retaining strip of the present invention; Figure 4 This is a schematic diagram of the angle structure of the lower windshield retaining strip according to another embodiment of the present invention. Figure 5 This is a schematic diagram illustrating the process of determining the first and second angles of the front windshield lower clip strip according to an embodiment of the present invention.

[0022] In the diagram: 1. Cover plate; 11. Snap-fit ​​rib; 111. Bend; 2. Snap-fit ​​strip; 21. Vertical rib sidewall; 211. First reinforcing rib; 22. Bottom wall; 23. Load-bearing sidewall; 24. Mounting groove; 25. Rigid rib; 26. Flexible snap-fit ​​joint; 27. Load-bearing rib; 271. Second reinforcing rib; 272. Soft buffer section; 28. Open end; 29. ​​Load-bearing section; α, First angle; β, Second angle. Detailed Implementation

[0023] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0024] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0026] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] like Figures 1 to 5As shown, the present invention provides a front windshield retaining strip to overcome the problems in the prior art where the setting structure of the soft component in the front windshield retaining strip groove cannot be improved, thus making it impossible to achieve a retaining action on the cover plate without relying solely on the soft component to apply force, and also preventing the vibration of the cover plate from directly colliding with the hard groove sidewall and generating abnormal noise.

[0028] like Figures 1 to 5 As shown, this embodiment proposes a windshield under-stripping strip, comprising: The cover plate 1 has a snap-fit ​​rib 11 at one end, and the end of the snap-fit ​​rib 11 is provided with a bent part 111; The clip 2 is provided with a U-shaped mounting groove 24 formed by the vertical rib sidewall 21, the bottom wall 22 and the load-bearing sidewall 23; The bottom wall 22 or the load-bearing side wall 23 is provided with rigid ribs 25, the load-bearing side wall 23 is provided with load-bearing ribs 27, and the load-bearing ribs 27 are provided with open ends 28 forming the mounting grooves 24 opposite to the vertical rib side wall 21. The end of the rigid rib 25 is provided with a flexible snap-fit ​​connector 26. The flexible snap-fit ​​connector 26 covers the side surface of the supporting rib 27 facing the opening end 28. When the snap-fit ​​rib 11 is inserted into the mounting groove 24, the bending part 111 pushes the flexible snap-fit ​​connector 26 to bend and deform into the mounting groove 24. One side of the bending part 111 abuts against the side wall 21 of the upright rib, and the other side tightly clamps the flexible snap-fit ​​connector 26 with the opening end 28 of the supporting rib 27. This allows the flexible snap-fit ​​connector 26 and the rigid supporting rib 27 to exert a superimposed force on the bending part 111 and form a stable snap-fit. Furthermore, the center line of the flexible snap-fit ​​connector 26 is set at a first angle α with the center line of the snap-fit ​​rib 11, so that the vibration of the snap-fit ​​rib 11 pushes the flexible snap-fit ​​connector 26 to move and deform in the direction of the supporting rib 27, while the snap-fit ​​rib 11 does not contact the supporting rib 27. When the snap-fit ​​rib 11 is pulled out of the mounting groove 24, the bent part 111 pushes the flexible snap-fit ​​connector 26 to fit tightly against the bearing rib 27, and the bent part 111 moves out of the mounting groove 24.

[0029] In particular, when the cover plate 1 is in the snap-fit ​​state, the bent part 111 and the open end 28 of the bearing rib 27 tightly clamp the flexible snap-fit ​​connector 26, thereby avoiding the need to rely solely on the flexible snap-fit ​​connector 26 to resist the elastic deformation force to fix the cover plate 1. This also avoids the cover plate 1 being difficult to disassemble when the rigidity of the flexible snap-fit ​​connector 26 is too high, and avoids the cover plate 1 being unstable and loose when the rigidity of the flexible snap-fit ​​connector 26 is too low. The center line of the flexible snap-fit ​​connector 26 is set at a first angle α with the center line of the snap-fit ​​rib 11, so that the component force of the pushing force generated by the snap-fit ​​rib 11 on the contact surface with the flexible snap-fit ​​connector 26 will cause it to move and deform in the direction of the bearing rib 27, while the snap-fit ​​rib 11 does not contact the bearing rib 27, thereby preventing collision noise.

[0030] like Figure 2 and 4 As shown, in this embodiment, the center line of the rigid rib 25 is set at a second angle β with the center line of the snap-fit ​​rib 11, so that the flexible snap-fit ​​joint 26 at the end of the rigid rib 25 tends to bend towards the opening end 28 rather than towards the inside of the mounting groove 24.

[0031] Specifically, the centerline of the flexible snap-fit ​​connector 26 is its symmetrical centerline perpendicular to the width direction when it does not undergo bending deformation, the centerline of the snap-fit ​​rib 11 is its symmetrical centerline at its narrowest point with consistent width, and the centerline of the rigid rib 25 is its symmetrical centerline.

[0032] Specifically, the flexible snap-fit ​​connector 26 is made of TPE or rubber.

[0033] In particular, in order to prevent elastic deformation at the connection with the rigid rib 25, the flexible snap-fit ​​connector 26 tends to extend along the centerline direction of the rigid rib 25. Since this centerline direction is set at an obtuse angle with the centerline of the snap-fit ​​rib 11, the flexible snap-fit ​​connector 26 tends to bend in the obtuse angle direction rather than the acute angle direction, thereby enabling the flexible snap-fit ​​connector 26 to snap and fix the bent portion 111 with a greater force.

[0034] In this embodiment, the length of the flexible snap-fit ​​connector 26 is less than the length of the rigid rib 25.

[0035] Specifically, the length of the flexible clamp 26 is the distance from its contact end with the rigid rib 25 to its free end, and the length of the rigid rib 25 is the distance from its connection point with the bottom wall 22 or the load-bearing side wall 23 to its connection point with the flexible clamp 26.

[0036] Specifically, such as Figure 1 As shown, rigid ribs 25 are provided on one side of the bottom wall 22 or at the corner of the bottom wall 22 and the load-bearing side wall 23, such as... Figure 3 As shown, rigid ribs 25 are provided on the load-bearing sidewall 23 to provide more space for the bend 111 within the mounting groove 24.

[0037] In particular, since the length of the flexible clamp 26 is less than the length of the rigid rib 25, even when the flexible clamp 26, which occupies only a small volume, undergoes any degree of bending deformation, the direction of the force exerted by the rigid rib 25 on the bent portion 111 through the flexible clamp 26 remains unchanged.

[0038] like Figure 5 As shown, in this embodiment, the method for determining the first angle α and the second angle β includes: Construct finite element simulation models of the cover plate and the retaining strip; Input the first angle to be optimized and the second angle to be optimized into the finite element simulation model to generate simulation mechanical parameters; The first angle to be optimized, the second angle to be optimized, the simulated mechanical parameters, and the material strength of the flexible clamp joint are used to determine the first angle α and the second angle β through an optimization model based on a non-dominated sorting genetic algorithm. The objective function of the optimization model includes a snap-fit ​​stability reference point or a plug-in / plug-out convenience reference point, to determine the first angle α and the second angle β of the snap-fit ​​stability bias, and the first angle α and the second angle β of the plug-in / plug-out stability bias, respectively.

[0039] Specifically, in the finite element simulation model, the materials of the cover plate are defined as PP and EPDM-T20, the material of the flexible locking connector of the locking strip is TPE, and the material of the rigid rib is POM engineering plastic. Based on the elastic modulus, Poisson's ratio, yield strength, and tensile strength of the rigid rib, the first-order Ogden hyperelastic constitutive model of the flexible locking connector, and the structural diagram of the cover plate and locking strip in the initial state including the first angle to be optimized and the second angle to be optimized, a finite element simulation model is constructed. The first-order Ogden hyperelastic constitutive model is used to describe the elastic deformation behavior of the flexible locking connector. The contact pairs defined in the finite element simulation model include: the bending part and the flexible locking connector, the bending part and the side wall of the upright rib, and the flexible locking connector and the load-bearing rib.

[0040] In this embodiment, the process of generating simulation mechanical parameters from the finite element simulation model includes: Construct finite element simulation models of cover plate 1 and card strip 2; Input the first angle to be optimized and the second angle to be optimized into the finite element simulation model to generate simulation mechanical parameters; The first angle to be optimized, the second angle to be optimized, the simulation mechanical parameters, and the material strength of the flexible clamp are used to determine the first angle α and the second angle β through an optimization model. The optimization model is a non-dominated sorting genetic algorithm architecture, which has a snap-in stability reference point and a plug-in / plug-out convenience reference point to determine the first angle α and the second angle β of the snap-in stability bias, as well as the first angle α and the second angle β of the plug-in / plug-out stability bias.

[0041] Specifically, the finite element simulation model simulates the insertion condition of the bent section, applying a quasi-static displacement of 50 mm / min to the cover plate along the negative Y-axis to obtain the force-displacement curve of the reaction force and displacement on the bent section, and recording the peak insertion force and insertion work. The finite element simulation model also simulates the vibration condition during vehicle movement, applying a sinusoidal displacement excitation to the far end of the cover plate, extracting the modal response through modal steady-state dynamics, and obtaining the relative displacement amplitude between the bent section and the supporting rib, as well as the time history change of the contact pressure. The finite element simulation model also simulates the pull-out condition, applying an upward quasi-static displacement of 50 mm / min to the top surface of the cover plate, and recording the peak pull-out force and static holding force.

[0042] Specifically, a Python script can automatically run a finite element simulation model multiple times by inputting the first angle to be optimized within a preset first angle range and the second angle to be optimized within a preset second angle range. It can also automatically extract the simulation mechanical parameters from the .odb file of the finite element simulation model and automatically input the simulation mechanical parameters, the first angle to be optimized, and the second angle to be optimized into the optimization model.

[0043] In this embodiment, the process of optimizing the model to determine the first angle α and the second angle β includes: The objective function is constructed based on minimizing the peak insertion force, maximizing the relative displacement amplitude, maximizing the contact pressure at the bend, maximizing the static holding force of the snap-fit, and minimizing the peak pull-out force. Treating the first angle to be optimized and the second angle to be optimized as individuals, calculate their corresponding non-dominated rankings; Based on the simulation mechanical parameters, the snap-fit ​​stability reference point, and the insertion and removal convenience reference point, the improved crowding distance corresponding to each individual is calculated, and a genetic iteration operation is performed to determine the first angle α and the second angle β as the optimal solution.

[0044] Specifically, the first angle to be optimized is within a preset first angle range, and the second angle to be optimized is within a preset second angle range. The preset first angle range is 95 degrees to 125 degrees to avoid excessive tilting of the flexible snap-fit ​​connector 26. Although it is easy to stick to the bearing rib 27 during vibration, the resistance increases significantly when it is pulled out, and the root strain may exceed the allowable value of the material, causing a risk of fatigue fracture. The preset second angle range is 95 degrees to 115 degrees to avoid the rigid rib 25 being too flat. Insertion is easy, but the locking ability is significantly reduced. Under vibration conditions, the flexible snap-fit ​​connector 26 may slip out of the bearing rib 27, resulting in insufficient holding force.

[0045] Specifically, the objective function is a five-dimensional objective vector directly constructed from the simulation mechanical parameters of the simulation results. Due to the conflicting objectives, such as the contradiction between minimizing the insertion force and maximizing the holding force, the optimization model will search for a set of non-dominated solutions, namely the Pareto front, to determine the optimal first angle α and second angle β.

[0046] Specifically, the algorithm flow of the preferred model is as follows: Step S1: Construct a population based on individuals and their corresponding simulation mechanical parameters. Sort all individuals in the population according to Pareto dominance: Individual p dominates individual q if and only if: individual p is less than or equal to individual q for all objective terms of the objective function, and there exists at least one objective term where individual p is less than individual q. Calculate the number of dominated individuals and the dominance set for each individual. Find individuals with a number of dominated individuals of 0 as the first frontier. For each individual in the first frontier, decrement the number of dominated individuals in its dominance set by 1, and then find new individuals with a number of dominated individuals of 0 as the second frontier, and so on.

[0047] Step S2: Calculate the improved congestion distance: Calculate the Euclidean distance from each individual to the stable reference point or the convenient reference point for insertion and removal to obtain the normalized reference point distance, using the formula... Calculate the improved congestion distance, where, This represents the improved crowding distance for individual i. This represents the original crowding distance of individual i, which is the sum of the distance differences between individual i and its neighboring individuals along each target direction. This represents the preference intensity coefficient, which controls the degree to which the reference point corrects for the congestion distance; its value is 2. Let R represent the normalized Euclidean distance from individual i to reference point R.

[0048] Step S3: Randomly select two individuals from the current population for comparison: prioritize individuals with lower non-dominant levels; if they are on the same frontier, select individuals with greater improved crowding distance. Repeat this process multiple times to select the parent population.

[0049] Step S4: Perform standard crossover and mutation genetic operations (SBX) on the two parent populations, and perform standard polynomial mutation on a single individual to obtain a progeny population with a number equal to the size of the parent population. Merge the parent population and the progeny population into a new parent population. Repeat steps S1 to S4 on the new parent population. All individuals with a non-dominant level of 1 in the final population constitute the Pareto front. Select the first angle α and the second angle β from the Pareto front that best fit the snap-in stability reference point and the plug-in convenience reference point, respectively, and output them.

[0050] Among them, crossover and mutation together ensure the convergence and diversity of the algorithm, enabling the frontier to effectively approximate the true optimal solution set, thus obtaining, for example... Figure 3 The first angle α and the second angle β shown tend to ensure stable engagement, and as... Figure 4 The first angle α and the second angle β are shown to ensure easy disassembly.

[0051] In this embodiment, the snap-fit ​​stability reference point includes the historical maximum value of the snap-fit ​​static holding force, the historical minimum value of the relative displacement amplitude, and the historical minimum value of the contact pressure at the bend. The reference points for easy insertion and removal include the historical minimum value of peak insertion force, the historical minimum value of insertion work, and the historical minimum value of peak extraction force.

[0052] Therefore, the historical maximum static holding force of the snap-fit ​​represents the best anti-detachment capability achievable to date. Using this maximum value as a reference point component guides the algorithm to search towards higher holding forces, ensuring that subsequent individuals approach or exceed this extreme value as closely as possible. The historical minimum relative displacement amplitude represents the minimum relative displacement amplitude between the bending portion and the supporting rib for all individuals under vibration conditions, encouraging the algorithm to explore design parameters that can further reduce vibration displacement. A smaller historical minimum contact pressure at the bending portion indicates a smoother contact between the flexible snap-fit ​​joint and the supporting rib, guiding the algorithm to evolve towards minimizing pressure fluctuations.

[0053] Therefore, the historical minimum of the peak insertion force guides the algorithm to search in the direction of reducing insertion resistance. The historical minimum of the insertion work reflects the energy consumption throughout the insertion process, and its minimum value represents the most effort-efficient insertion curve. This component encourages the algorithm to find a design with low resistance throughout the insertion process. The historical minimum of the peak pull-out force affects the ease of disassembly and maintenance, guiding the algorithm to avoid generating excessive disassembly resistance and ensuring that the snap-fit ​​structure can be repeatedly disassembled and reassembled.

[0054] Specifically, such as Figure 2 The first angle α and the second angle β of the shown snap-fit ​​stability bias are 115 degrees and 128 degrees, respectively, and the simulated peak insertion force is 98N. Figure 4 The first angle α and the second angle β shown are 122 degrees and 135 degrees, respectively, and the simulated peak insertion force is 145N. Compared with the original model, which has a first angle α and the second angle β of 105 degrees and 110 degrees, respectively, the simulated peak insertion force is 128N. It can be seen that the optimized model can significantly enhance the snap-fit ​​stability and greatly improve the assembly convenience.

[0055] In this embodiment, the flexible snap-fit ​​connector 26, when not undergoing bending deformation, is a tongue-shaped structure that gradually widens outward from the end of the rigid rib 25.

[0056] In particular, the connection between the flexible snap-fit ​​connector 26 and the rigid rib 25 is the narrowest and most prone to bending deformation, which ensures that the flexible snap-fit ​​connector 26 bends around the connection towards the open end 28, further ensuring that the flexible snap-fit ​​connector 26 clamps and fixes the bent part 111 with a greater force.

[0057] In this embodiment, the upright rib sidewall 21 is a planar structure. When the snap-fit ​​rib 11 is pulled out of the mounting groove 24, the bending part 111 pushes the flexible snap-fit ​​connector 26 to press against the bearing rib 27. The bending part 111 pushes the upright rib sidewall 21 to bend, so that the bending part 111 moves out of the mounting groove 24.

[0058] In particular, the planar structure of the vertical rib sidewall 21 avoids interference with the movement of the bent portion 111 out of the mounting groove 24. The bending of the vertical rib sidewall 21 avoids the need to move the bent portion 111 out by compressing the flexible snap joint 26 alone, thus reducing the resistance to the movement of the bent portion 111 and further facilitating the disassembly of the cover plate 1.

[0059] In this embodiment, a first reinforcing rib 211 is provided inside the upright rib sidewall 21, and the length of the first reinforcing rib 211 inside the upright rib sidewall 21 is less than the length of the upright rib sidewall 21.

[0060] In particular, since the length of the first reinforcing rib 211 inside the upright rib sidewall 21 is less than the length of the rigid rib 25, when the snap-fit ​​rib 11 is pulled out of the mounting groove 24, the area of ​​the upright rib sidewall 21 without reinforcing ribs is more likely to bend. Thus, while ensuring the structural strength of the upright rib sidewall 21 through the reinforcing rib, the bending part 111 pushes the upright rib sidewall 21 to bend, which further facilitates the disassembly of the cover plate 1.

[0061] In this embodiment, the first reinforcing rib 211 extends from the vertical rib sidewall 21 to the bottom wall 22 and the load-bearing sidewall 23.

[0062] In particular, the continuous and complete first reinforcing rib 211 enhances the overall structural strength of the mounting groove 24, further realizing the stable engagement of the mounting groove 24 with the cover plate 1.

[0063] In this embodiment, the load-bearing sidewall 23 extends away from the mounting groove 24 to form the load-bearing section 29 of the clip 2, and the load-bearing section 29 and the load-bearing rib 27 are used to fix the windshield.

[0064] In this embodiment, one side of the supporting rib 27 is installed in contact with the cover plate 1, and the other side is installed in contact with the windshield.

[0065] In this embodiment, the interior of the supporting rib 27 is provided with a second reinforcing rib 271, and the area where the supporting rib 27 contacts the cover plate 1 is provided with a soft buffer portion 272.

[0066] Specifically, the soft cushioning part 272 is made of TPE, rubber, or other soft materials.

[0067] In particular, the load-bearing rib 27, which is provided with a second reinforcing rib 271 and a soft buffer part 272, enables the stable installation of the clip 2 on the cover plate 1 and the windshield.

[0068] Specifically, when a downward insertion force is applied to push the cover plate 1 and its curved portion 111 into the mounting groove 24, the curved portion 111 at the end of the snap-fit ​​rib 11 first contacts the upper surface of the flexible snap-fit ​​connector 26. At this time, the arc-shaped front end of the curved portion 111 applies a downward oblique force to the flexible snap-fit ​​connector 26. Since the rigid rib 25 and the snap-fit ​​rib 11 are set at a second angle β, the flexible snap-fit ​​connector 26 preferentially undergoes directional bending deformation towards the inside of the mounting groove 24, rather than turning outward towards the opening end 28. The flexible snap-fit ​​connector 26 rotates inward around the narrowest connection point with the rigid rib 25, gradually... As the flexible snap-fit ​​joint 26 gradually presses against the inner surface of the rigid rib 25, the curved part 111 continues to move downward, and its outer arc surface forms a sliding contact with the inner surface of the upright rib sidewall 21. The upright rib sidewall 21 undergoes a slight elastic outward expansion deformation, causing the flexible snap-fit ​​joint 26 to flip from the bottom of the curved part 111 to the top. The snap-fit ​​structure automatically enters the locking state, and the curved part 111 is fully inserted into the mounting groove 24. The flexible snap-fit ​​joint 26 rebounds, and one side of the curved part 111 abuts tightly against the upright rib sidewall 21, while the other side, together with the opening end 28 of the bearing rib 27, tightly clamps the flexible snap-fit ​​joint 26 in the middle.

[0069] The flexible snap-fit ​​connector 26, under the action of the bearing rib 27, pushes the bent part 111 with its elastic force, forming a snap-fit ​​fixation. At this time, the snap-fit ​​force is generated by the superposition of two parts: one is the rigid support force transmitted by the bearing rib 27 through the flexible snap-fit ​​connector 26, and the other is the elastic restoring force of the flexible snap-fit ​​connector 26 itself. At this time, the snap-fit ​​rib 11 and the bearing rib 27 always maintain a gap, without any hard contact, which completely eliminates the collision noise caused by vibration during vehicle operation.

[0070] During vehicle operation, the cover plate 1 is subjected to continuous vibrations from the engine and the road surface. In this embodiment, vibration is used to achieve self-locking enhancement rather than loosening. Specifically, when the locking rib 11 vibrates upward, it applies an upward force to the flexible locking connector 26. Since the flexible locking connector 26 and the locking rib 11 are set at a first angle α, the force is decomposed into a component perpendicular to the flexible locking connector 26 and a component parallel to the flexible locking connector 26. The parallel component pushes the flexible locking connector 26 to undergo a slight movement and deformation towards the bearing rib 27, which further increases the clamping force. The greater the vibration amplitude, the stronger the clamping force, forming a positive feedback self-locking effect. Throughout the process, the locking rib 11 never contacts the bearing rib 27, and no metal or plastic collision sound is produced.

[0071] Specifically, when it is necessary to remove the cover plate 1, simply apply an upward pulling force to easily unlock it without using any tools. The process is as follows: pull the cover plate 1 upward, and the bent part 111 applies an upward force to the flexible snap-fit ​​connector 26. Due to the inclined angle design of the flexible snap-fit ​​connector 26, this force will push the flexible snap-fit ​​connector 26 tightly against the surface of the opening end 28 of the support rib 27, rather than being stuck between the bent part 111 and the support rib 27. The flexible snap-fit ​​connector 26 is completely flattened on the support rib 27, at which point the mounting groove 24 has... When the effective opening width increases to be greater than the maximum width of the curved part 111, the cover plate 1 is pulled upwards. The outer arc surface of the curved part 111 pushes the vertical rib sidewall 21 to elastically expand and bend outwards. The upper area of ​​the vertical rib sidewall 21 without the first reinforcing rib 211 bends first, further increasing the opening of the mounting groove 24. The curved part 111 passes smoothly through the opening end 28 and is completely removed from the mounting groove 24, completing the unlocking. After being pulled out, both the vertical rib sidewall 21 and the flexible snap-fit ​​connector 26 return to their initial state under their own elasticity. The snap-fit ​​strip 2 can be reused.

[0072] Therefore, the locking strip 2 described in this embodiment relies on clamping rather than barbs to lock the cover plate 1. The locking force is provided by the elasticity of the flexible locking joint 26 and the rigidity of the bearing rib 27, while the pulling force only needs to overcome the slight bending force of the side wall 21 of the upright rib. This achieves the effect of locking tighter and removing more easily, while completely solving the problems of abnormal noise and easy damage of traditional locking strip 2.

[0073] In this embodiment, a three-layer clamping structure consisting of a bending section, a flexible snap-fit ​​connector, and a load-bearing rib is employed. This structure can withstand severe vibrations and impacts during vehicle operation and will not loosen or detach even after long-term use. Furthermore, in the snap-fit ​​state, there is never direct contact between the snap-fit ​​rib and the load-bearing rib, eliminating the source of collision noises during vibration. A non-dominated sorting genetic algorithm is used to perform multi-objective optimization on the two obtuse angle parameters, generating parameters that favor snap-fit ​​stability and ease of insertion / removal. This meets the needs of different scenarios and can simultaneously consider multiple conflicting design objectives such as snap-fit ​​stability and ease of insertion / removal, automatically generating the optimal angle. This provides designers with a scientific basis for decision-making and shortens the product development cycle of the snap-fit ​​strip.

[0074] Those skilled in the art will recognize that the modules and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0075] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A windshield under-shield retaining strip, characterized in that, include: The cover plate (1) has a snap-fit ​​rib (11) at one end, and the end of the snap-fit ​​rib (11) is provided with a bent part (111); The clip (2) is provided with a U-shaped mounting groove (24) formed by the vertical rib sidewall (21), bottom wall (22) and load-bearing sidewall (23); The bottom wall (22) or the load-bearing side wall (23) is provided with rigid ribs (25), the load-bearing side wall (23) is provided with load-bearing ribs (27), and the load-bearing ribs (27) and the vertical rib side wall (21) are provided with an open end (28) forming an installation groove (24); The rigid rib (25) is provided with a flexible snap-fit ​​connector (26) at its end. The flexible snap-fit ​​connector (26) covers the side surface of the supporting rib (27) facing the opening end (28). When the snap-fit ​​rib (11) is inserted into the mounting groove (24), the bending part (111) pushes the flexible snap-fit ​​connector (26) to bend and deform into the mounting groove (24). One side of the bending part (111) abuts against the side wall (21) of the upright rib, and the other side is tightly fitted against the opening end (28) of the supporting rib (27). The flexible snap-fit ​​connector (26) is clamped so that the flexible snap-fit ​​connector (26) and the rigid bearing rib (27) exert superimposed force on the bent portion (111) and form a stable snap-fit. Furthermore, the center line of the flexible snap-fit ​​connector (26) is set at a first angle (α) with the center line of the snap-fit ​​rib (11) so that when the snap-fit ​​rib (11) vibrates, it pushes the flexible snap-fit ​​connector (26) to move and deform in the direction of the bearing rib (27), while the snap-fit ​​rib (11) and the bearing rib (27) remain spaced apart. The centerline of the rigid rib (25) is set at a second angle (β) relative to the centerline of the snap-fit ​​rib (11), and the second angle (β) is set at an obtuse angle so that when the flexible snap-fit ​​joint (26) at the end of the rigid rib (25) is subjected to the bending part (111), it tends to bend towards the opening end (28) rather than bending towards the inside of the mounting groove (24); The length of the flexible snap-fit ​​connector (26) is less than the length of the rigid rib (25); The flexible snap-fit ​​connector (26) is a tongue-shaped structure that gradually widens outward from the end of the rigid rib (25) when it does not undergo bending deformation.

2. The windshield retaining strip according to claim 1, characterized in that, The methods for determining the first angle (α) and the second angle (β) include: Construct finite element simulation models of the cover plate (1) and the card strip (2); Input the first angle to be optimized and the second angle to be optimized into the finite element simulation model to generate simulation mechanical parameters; The first angle to be optimized, the second angle to be optimized, the simulation mechanical parameters, and the strength of the flexible snap-fit ​​connector material are used to determine the first angle (α) and the second angle (β) through an optimization model. The optimization model is a non-dominated sorting genetic algorithm architecture, which has a snap-fit ​​stability reference point and an insertion / removal convenience reference point to determine the first angle (α) and the second angle (β) of snap-fit ​​stability bias, and the first angle (α) and the second angle (β) of insertion / removal stability bias, respectively.

3. The windshield retaining strip according to claim 2, characterized in that, The process of generating simulation mechanical parameters from the finite element simulation model includes: In the finite element simulation model, a quasi-static displacement in the insertion direction is applied to the cover plate to generate the peak insertion force; In the finite element simulation model, a displacement excitation is applied to the cover plate to generate the relative displacement amplitude between the bent part and the bearing rib, as well as the contact pressure of the bent part; In the finite element simulation model, a quasi-static displacement in the pull-out direction is applied to the cover plate to generate the peak values ​​of the snap-fit ​​static holding force and the pull-out force of the bent portion; The simulated mechanical parameters include peak insertion force, relative displacement amplitude, contact pressure at the bend, static holding force of the snap-fit, and peak pull-out force.

4. The windshield retaining strip according to claim 3, characterized in that, The process of optimizing the model to determine the first angle (α) and the second angle (β) includes: The objective function is constructed based on minimizing the peak insertion force, maximizing the relative displacement amplitude, maximizing the contact pressure at the bend, maximizing the static holding force of the snap-fit, and minimizing the peak pull-out force. Treating the first angle to be optimized and the second angle to be optimized as individuals, calculate their corresponding non-dominated rankings; Based on the simulation mechanical parameters, the snap-fit ​​stability reference point, and the insertion and removal convenience reference point, the improved crowding distance corresponding to the individual is calculated, and a genetic iteration operation is performed to determine the first angle (α) and the second angle (β) as the optimal solution.

5. The windshield retaining strip according to claim 3, characterized in that, The snap-fit ​​stability reference points include the historical maximum value of the snap-fit ​​static holding force, the historical minimum value of the relative displacement amplitude, and the historical minimum value of the contact pressure at the bend. The reference points for easy insertion and removal include the historical minimum value of peak insertion force, the historical minimum value of insertion work, and the historical minimum value of peak extraction force.

6. The windshield retaining strip according to claim 1, characterized in that, The side wall (21) of the vertical rib is a planar structure. When the snap-fit ​​rib (11) is pulled out of the mounting groove (24), the bending part (111) pushes the flexible snap-fit ​​connector (26) to press against the bearing rib (27). The bending part (111) pushes the side wall (21) of the vertical rib to bend, so that the bending part (111) moves out of the mounting groove (24).

7. The windshield retaining strip according to claim 1, characterized in that, The first reinforcing rib (211) is provided inside the side wall of the vertical rib (21), and the length of the first reinforcing rib (211) inside the side wall of the vertical rib (21) is less than the length of the side wall of the vertical rib (21); The first reinforcing rib (211) extends from the vertical rib sidewall (21) to the bottom wall (22) and the load-bearing sidewall (23).

8. The windshield retaining strip according to claim 1, characterized in that, The load-bearing sidewall (23) extends away from the mounting groove (24) to form the load-bearing section (29) of the clip (2), and the load-bearing section (29) and the load-bearing rib (27) are used to fix the windshield.

9. The windshield under-shield retaining strip according to any one of claims 1 to 8, characterized in that, The bearing rib (27) is provided with a second reinforcing rib (271) inside, and a soft buffer part (272) is provided in the area where the bearing rib (27) contacts the cover plate (1).

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