A-pillar garnish design method and a-pillar garnish

Abstract

The present application relates to the technical field of A column guard plate assembly, in particular to an A column guard plate design method and an A column guard plate, the method comprising the following steps: obtaining the movement cooperation section of the A column guard plate and the instrument panel according to the cooperation boundary line of the A column guard plate and the instrument panel; obtaining the design interference amount of the A column guard plate and the instrument panel, the first vertical distance between the lowermost end fixed buckle of the A column guard plate in the initial assembly position and the upper surface of the instrument panel, the second vertical distance between the rotation axis of the A column guard plate and the upper surface of the instrument panel, and the relationship between the initial design distance of the lowermost end fixed buckle and the rotation axis of the A column guard plate; determining the horizontal distance between the rotation axis of the A column guard plate and the instrument panel according to the relationship between the design interference amount, the first vertical distance, the second vertical distance and the initial design distance. The method can solve the problems of the prior art, such as time-consuming, labor-consuming and low efficiency, which are caused by the dependence on the experience of designers and the numerical reference of past models.

Description

Technical Field

[0001] This invention relates to the field of A-pillar guard plate assembly technology, specifically to an A-pillar guard plate design method and an A-pillar guard plate. Background Technology

[0002] The A-pillar trim, located at the front windshield of a car, primarily serves to cover the car's body panels and interior trim, and is an important component of the automotive interior. Inside the A-pillar trim, components such as sunroof drain pipes, wiring harnesses, and side curtain airbags are typically housed. In particular, the connectors for the instrument panel wiring harness and the body wiring harness are located here. Due to the requirements for the placement, inspection, and maintenance of components such as wiring harnesses and drain pipes, the A-pillar trim must be easy to install and remove.

[0003] The current design and installation method for A-pillar guards typically involves designing a pin at the bottom, inserting it obliquely into the dashboard, and then rotating it to fit onto the body sheet metal, as shown below. Figure 1 As shown. This assembly method, due to the angled insertion into the dashboard, inevitably causes interference with the dashboard during assembly. To ensure convenient A-pillar trim assembly, the interference between the A-pillar and the dashboard must not be excessive during the A-pillar assembly process; the greater the interference, the more difficult the A-pillar trim assembly becomes. Generally, the interference requirements vary depending on the dashboard material. Extensive testing on actual vehicle models has shown that for soft dashboards (such as slush-molded foam), an interference of ≤4mm during A-pillar assembly ensures convenient A-pillar trim assembly; for hard dashboards (such as injection-molded dashboards), an interference of ≤2mm during A-pillar assembly ensures convenient A-pillar trim assembly, as shown below. Figure 2 As shown. During the installation of the A-pillar trim panel, the amount of interference with the dashboard determines the ease of installation. This interference is related to multiple factors, including the height of the A-pillar trim panel clips, the position of the pins, and the position of the rotation axis, and involves several variables. Currently, the usual approach is to refer to the layout dimensions of previous models, estimate the arrangement of these variables, and then perform an A-pillar DMU motion check to see if the interference between the A-pillar and the dashboard meets the requirements. If not, the values ​​of the A-pillar clip height, rotation axis position, and pin position are adjusted, and the A-pillar DMU motion check is performed again. This process is repeated until the interference requirements are met, as shown below. Figure 3 , Figure 4 As shown.

[0004] Preliminary layout estimations based on experience, combined with DMU motion verification, ultimately determine the values ​​of each variable and the placement of the A-pillar rotation axis. While this method ultimately yields the placement of the A-pillar rotation axis and determines the values ​​of each variable, it is time-consuming and relies heavily on the designer's experience and numerical references from past models. The final rotation axis and parameter values ​​are not optimal, making it time-consuming, labor-intensive, and inefficient. When environmental factors or CAS (Computer-Aided Design) change, the preliminary layout estimation needs to be repeated, requiring a cycle of checks. This process is not only time-consuming and labor-intensive but also lacks iterative design capabilities, wasting significant manpower and time. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an A-pillar guard plate design method and A-pillar guard plate, which can solve the problems of the existing design method relying on the designer's experience and numerical reference of past models, which is time-consuming, labor-intensive and inefficient.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] On one hand, the present invention provides a design method for an A-pillar guard plate, comprising the following steps:

[0008] Based on the A-pillar trim surface and the instrument panel surface, determine the mating boundary line between the A-pillar trim and the instrument panel.

[0009] Obtain the kinematic fit section between the A-pillar guard plate and the instrument panel at a set point on the mating boundary line;

[0010] Based on the kinematic fit section between the A-pillar trim and the instrument panel, the design interference between the A-pillar trim and the instrument panel, the first vertical distance between the bottom fixing buckle of the A-pillar trim at the initial assembly position and the upper surface of the instrument panel, the second vertical distance between the rotation axis of the A-pillar trim and the upper surface of the instrument panel, and the relationship between the bottom fixing buckle and the initial design distance between the rotation axis of the A-pillar trim and the rotation axis of the A-pillar trim are obtained.

[0011] Based on the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance, determine the lateral distance between the A-pillar guard plate rotation axis and the instrument panel.

[0012] In some alternative solutions, determining the lateral distance between the A-pillar guard plate rotation axis and the dashboard based on the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance includes:

[0013] Based on the geometric relationship between the first vertical distance, the second vertical distance, and the initial design distance, determine the angle between the initial assembly position and the completed assembly position of the A-pillar guard plate;

[0014] Based on the geometric relationship between the angle between the A-pillar trim plate at the initial assembly position and the completed assembly position, the distance between the intersection of the A-pillar trim plate at the initial assembly position and the upper surface of the dashboard and the mating boundary line, and the design interference, determine the distance between the intersection of the A-pillar trim plate at the initial assembly position and the upper surface of the dashboard and the mating boundary line.

[0015] Based on the geometric relationship between the distance between the intersection of the A-pillar guard plate and the upper surface of the dashboard at the initial assembly position and the mating boundary line, the second vertical distance, the first vertical distance, the initial design distance, and the lateral distance between the rotation axis of the A-pillar guard plate and the dashboard, determine the lateral distance between the rotation axis of the A-pillar guard plate and the dashboard.

[0016] In some alternative solutions, the angle γ between the initial assembly position and the completed assembly position of the A-pillar guard plate is determined according to the formula γ=arc tan(H / (L1+L2)), where L is the second vertical distance, L is the first vertical distance, and H is the lateral distance between the bottom fixing buckle of the A-pillar guard plate and the completed assembly position.

[0017] 4. The A-pillar guard plate design method as described in claim 3, characterized in that: according to the formula Determine the lateral distance H between the bottom fixing buckle (5) of the A-pillar guard plate (1) from the initial assembly position to the assembly completion position, where H′ is the initial design distance.

[0018] In some alternative solutions, according to the formula Z = L 干涉量 / cos arc tan(H / (L1+L2)) determines the distance between the intersection of the A-pillar trim panel and the upper surface of the dashboard at the assembled position and the mating boundary line, where L 干涉量 This refers to the distance between the A-pillar trim panel at its assembled position and the point where it rotates to contact the dashboard.

[0019] In some alternative solutions, the lateral distance between the A-pillar trim rotation axis and the dashboard includes:

[0020] Based on the geometric relationship between the distance from the intersection of the A-pillar trim plate and the upper surface of the dashboard at the initial assembly position to the mating boundary line, the second vertical distance, the first vertical distance, the initial design distance, and the lateral distance between the rotation axis of the A-pillar trim plate and the dashboard, the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance is determined.

[0021] Based on the initial design distance, the design range of the first vertical distance, the design range of the second vertical distance, and the design range of the design interference, the lateral distance range between the A-pillar guard plate rotation axis and the dashboard is determined according to the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance.

[0022] Based on the set distance range between the A-pillar guard plate rotation axis and the dashboard, select the optimal lateral distance within the lateral distance range.

[0023] In some alternative schemes, the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance is Y = H * L2 / (L1 + L2) - L 干涉量 / cos arc tan(H / (L1+L2)).

[0024] In some alternative solutions, the set distance range is 3-10mm.

[0025] In some alternative solutions, when the lateral distance range is not within the set distance range, the lateral distance range is re-obtained by adjusting the initial design distance so that there is an overlap between the lateral distance range and the set distance range.

[0026] On the other hand, the present invention also provides an A-pillar guard plate, designed using the A-pillar guard plate design method described in any of the above claims.

[0027] Compared with the prior art, the advantages of the present invention are as follows: When designing the A-pillar guard plate using the above-mentioned A-pillar guard plate design method, the mating boundary line between the A-pillar guard plate and the instrument panel is determined according to the A-pillar guard plate styling surface and the instrument panel styling surface; the kinematic mating section between the A-pillar guard plate and the instrument panel is obtained at a set point on the mating boundary line; based on the kinematic mating section between the A-pillar guard plate and the instrument panel, the relationship between the design interference between the A-pillar guard plate and the instrument panel, the first vertical distance between the lowermost fixing buckle of the A-pillar guard plate at the initial assembly position and the upper surface of the instrument panel, the second vertical distance between the rotation axis of the A-pillar guard plate and the upper surface of the instrument panel, and the initial design distance between the lowermost fixing buckle and the rotation axis of the A-pillar guard plate is obtained; the lateral distance between the rotation axis of the A-pillar guard plate and the instrument panel is determined according to the relationship between the design interference, the first vertical distance, the second vertical distance and the initial design distance. This design method allows for the setting of design interference based on the dashboard material. It enables the rapid and efficient determination of parameters such as the A-pillar trim clip height, pin position, and rotation axis position, while ensuring the A-pillar trim's interference with the dashboard during assembly and facilitating assembly. This saves design and development time. Furthermore, by obtaining the design interference between the A-pillar trim and dashboard, the first vertical distance between the lowermost fixing clip and the dashboard's upper surface, the second vertical distance between the A-pillar trim's rotation axis and the dashboard's upper surface, and the initial design distance between the lowermost fixing clip and the A-pillar trim's rotation axis, based on the kinematic mating cross-section, this method allows for rapid and continuous iterative updates to the design scheme when environmental components or the A-pillar trim and dashboard CAS (Compatibility and Design System) change. This shortens the design and development cycle and increases the design freedom of the A-pillar trim and dashboard CAS. This design method is applicable to all A-pillar trim designs with oblique insertion, has a wide range of applications, and is highly promising for widespread adoption. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram illustrating the assembly process of the A-pillar trim panel and the instrument panel.

[0030] Figure 2 A sectional view showing the completed assembly of the A-pillar trim panel and the dashboard;

[0031] Figure 3 This is a structural schematic diagram of the A-pillar guard plate;

[0032] Figure 4Flowchart of the existing A-pillar guard plate design method;

[0033] Figure 5 This is a flowchart illustrating the design method of the A-pillar guard plate of the present invention;

[0034] Figure 6 A schematic diagram showing the matching of the curved surface of the A-pillar trim panel and the curved surface of the instrument panel.

[0035] Figure 7 This is a schematic diagram of the assembly process for the A-pillar guard plate.

[0036] In the diagram: 1. A-pillar guard plate; 2. Instrument panel; 3. Body sheet metal; 4. Fitting boundary line; 5. Bottom fixing buckle; 6. A-pillar guard plate rotation axis. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figures 5-7 As shown, the present invention provides a design method for an A-pillar liner, comprising the following steps:

[0040] S1: Based on the A-pillar trim surface and the instrument panel surface, determine the mating boundary line 4 between the A-pillar trim and the instrument panel.

[0041] In this embodiment, based on the designed A-pillar guard plate 1 and instrument panel 2, the CAS (Computer Assistant Styling) of the A-pillar guard plate and instrument panel is obtained, namely the A-pillar guard plate styling surface and the instrument panel styling surface. Based on the contact line after the A-pillar guard plate styling surface and the instrument panel styling surface are converted and assembled, the mating boundary line 4 between the A-pillar guard plate 1 and the instrument panel 2 is determined.

[0042] S2: Obtain the kinematic mating section between the A-pillar guard plate 1 and the instrument panel 2 at the set point on the mating boundary line 4.

[0043] like Figure 7As shown, in this embodiment, the set point on the mating boundary line 4 refers to the midpoint on the mating boundary line 4. A sectional view is made in the vertical direction at the midpoint of the mating boundary line 4, and a schematic line is added to the sectional view to indicate the initial assembly position of the A-pillar guard plate 1 and the contact position between the A-pillar guard plate 1 and the instrument panel 2, so as to obtain the kinematic mating section between the A-pillar guard plate 1 and the instrument panel 2.

[0044] Figure 7 In this diagram, α is the angle between the A-pillar trim 1 at its assembled position and the position where it contacts the instrument panel 2, i.e., the angle between the line indicating the assembled position of A-pillar trim 1 and the line indicating the contact position of A-pillar trim 1 with the instrument panel 2; β is the angle between the position where A-pillar trim 1 contacts the instrument panel 2 and the initial assembled position of A-pillar trim 1, i.e., the angle between the line indicating the contact position of A-pillar trim 1 with the instrument panel 2 and the line indicating the initial assembled position of A-pillar trim 1; γ is the angle between the initial and assembled positions of A-pillar trim 1; H′ is the initial design distance between the lowermost fixing buckle 5 and the rotation axis 6 of the A-pillar trim; Z is the distance between the intersection of the A-pillar trim 1 at its initial assembled position and the upper surface of the instrument panel 2 and the mating boundary line 4; L... 干涉量 Y is the distance between the A-pillar guard plate 1 at its assembled position and the point where it rotates to contact the instrument panel 2. Y is the lateral distance between the rotation axis 6 of the A-pillar guard plate and the instrument panel 2. The initial assembly position of the A-pillar guard plate 1 is the initial position where it is inserted between the body sheet metal 3 and the instrument panel 2. The assembled position of the A-pillar guard plate 1 is the position where it is fully assembled into the body sheet metal 3.

[0045] S3: Based on the kinematic fit section of the A-pillar guard plate 1 and the instrument panel 2, obtain the design interference between the A-pillar guard plate 1 and the instrument panel 2, the first vertical distance between the bottommost fixing buckle 5 of the A-pillar guard plate 1 at the initial assembly position and the upper surface of the instrument panel 2, the second vertical distance between the rotation axis 6 of the A-pillar guard plate and the upper surface of the instrument panel 2, and the geometric relationship between the bottommost fixing buckle and the rotation axis 6 of the A-pillar guard plate.

[0046] like Figure 7 As shown, the geometric relationship between the lateral distance H of the bottom fixing buckle 5 of the A-pillar guard plate 1 from the initial assembly position to the assembly completion position, the included angle γ between the A-pillar guard plate 1 and the assembly completion position, the first vertical distance L1 between the bottom fixing buckle 5 of the A-pillar guard plate 1 and the upper surface of the instrument panel 2 at the initial assembly position, and the second vertical distance L2 between the rotation axis 6 of the A-pillar guard plate and the upper surface of the instrument panel 2 is Tanγ=H / (L1+L2), where H′ is the initial design distance between the bottom fixing buckle and the rotation axis 6 of the A-pillar guard plate.

[0047] The geometric relationship between L1, L2, H, and the initial design distance H′ between the bottom fixing buckle and the rotation axis 6 of the A-pillar guard plate is: (L1+L2) 2 +H 2 =H′ 2 .

[0048] In addition, after assembly, the A-pillar guard plate 1 is fitted with the side of the instrument panel 2 with clearance, and is parallel and perpendicular to the upper surface of the instrument panel. In the figure, α=α1; γ=γ1=γ2.

[0049] γ2, the distance Z between the intersection of A-pillar trim 1 and the upper surface of instrument panel 2 in the initial assembly position and the mating boundary line 4, and the distance L between the A-pillar trim 1 in the completed assembly position and the point where the A-pillar trim 1 rotates to contact the instrument panel 2. 干涉量 The geometric relationship is Cosγ2=L 干涉量 / Z.

[0050] In addition, based on the principle of proportionality of right triangles, the geometric relationship between L1, L2, H, Z and the lateral distance Y between the A-pillar guard plate rotation axis 6 and the instrument panel 2 can be obtained as: L2 / (L1+L2)=(Y+Z) / H.

[0051] S4: Determine the lateral distance between the A-pillar guard plate rotation axis 6 and the instrument panel 2 based on the geometric relationship between the design interference, the first vertical distance, the second vertical distance and the initial design distance.

[0052] In some optional embodiments, step S4 includes:

[0053] S41: Based on the geometric relationship between the first vertical distance, the second vertical distance and the initial design distance, determine the angle between the initial assembly position and the completed assembly position of the A-pillar guard plate 1.

[0054] In this example, based on the geometric relationship Tanγ=H / (L1+L2) between H, γ, L1 and L2, the expression formula for γ can be derived as γ=arc tan(H / (L1+L2)), thereby determining the angle γ between the initial assembly position and the completed assembly position of the A-pillar guard plate 1, where L2 is the second vertical distance, L1 is the first vertical distance, and H is the lateral distance between the bottommost fixing buckle 5 of the A-pillar guard plate 1 and the completed assembly position.

[0055] In addition, based on the geometric relationship between L1, L2, H, and the initial design distance H′ between the lowest fixing buckle 5 and the rotation axis 6 of the A-pillar guard plate: (L1+L2) 2 +H 2 =H′ 2 The formula for H can be derived. Determine the lateral distance H between the bottom fixing buckle (5) of the A-pillar guard plate (1) from the initial assembly position to the assembly completion position, where H′ is the initial design distance.

[0056] S42: Based on the angle between the initial assembly position and the completed assembly position of the A-pillar guard plate 1, the distance between the intersection of the A-pillar guard plate 1 and the upper surface of the instrument panel 2 at the initial assembly position and the mating boundary line 4, and the geometric relationship between the design interference amount, determine the distance between the intersection of the A-pillar guard plate 1 and the upper surface of the instrument panel 2 at the initial assembly position and the mating boundary line 4.

[0057] In this example, based on γ2, Z, and L 干涉量 The geometric relationship is Cosγ2=L 干涉量 From / Z, we can derive the formula for the distance Z between the intersection of the A-pillar trim 1 and the upper surface of the instrument panel 2 at the initial assembly position and the mating boundary line 4: Z = L 干涉量 / cosγ2, where γ=γ1=γ2, therefore, Z=L 干涉量 / cosγ, and since γ=arc tan(H / (L1+L2)), we can obtain Z=L 干涉量 / cosarc tan(H / (L1+L2)), where, get L 干涉量 The design interference between the A-pillar guard plate 1 and the instrument panel 2 is the distance between the A-pillar guard plate 1 at the assembled position and the point where the A-pillar guard plate rotates to contact the instrument panel 2, and the maximum interference between the A-pillar guard plate 1 and the instrument panel 2 in the vertical direction.

[0058] S43: Determine the lateral distance between the A-pillar guard plate 1 and the instrument panel 2 based on the geometric relationship between the distance between the intersection of the A-pillar guard plate 1 and the upper surface of the instrument panel 2 at the initial assembly position and the mating boundary line 4, the second vertical distance, the first vertical distance, the initial design distance, and the lateral distance between the A-pillar guard plate rotation axis 6 and the instrument panel 2.

[0059] In some optional embodiments, step S43 includes the following steps:

[0060] Based on the geometric relationship between the distance between the intersection of the A-pillar guard plate 1 and the upper surface of the instrument panel 2 at the initial assembly position and the mating boundary line 4, the second vertical distance, the first vertical distance, the initial design distance, and the lateral distance between the rotation axis 6 of the A-pillar guard plate and the instrument panel 2, the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance is determined.

[0061] In this embodiment, based on the geometric relationship between L1, L2, H, Z and the lateral distance Y between the A-pillar guard plate rotation axis 6 and the instrument panel 2: L2 / (L1+L2)=(Y+Z) / H, the formula for expressing the lateral distance Y=L2*H / (L1+L2)-Z can be derived. Substituting Z=L 干涉量 / cos arc tan(H / (L1+L2)) and The final relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance is as follows:

[0062] Based on the initial design distance H′, the design range of the first vertical distance L1, the design range of the second vertical distance L2, and the design range of the design interference, the lateral distance range between the A-pillar guard plate rotation axis 6 and the instrument panel 2 is determined according to the relationship between the design interference, the first vertical distance, the second vertical distance and the initial design distance.

[0063] After obtaining the lateral distance range between the A-pillar guard plate rotation axis 6 and the instrument panel 2, the optimal lateral distance is selected within the lateral distance range according to the set distance range between the A-pillar guard plate rotation axis 6 and the instrument panel 2.

[0064] In this example, considering the gap between the A-pillar guard plate 1 and the instrument panel 2, the set distance range is 3-10mm.

[0065] In addition, the initial design distance H′ can be set according to the specific design requirements. Since the A-pillar guard plate 1 and the instrument panel 2 are plastic parts, they are easily deformable. The design range of the first vertical distance L1 between the lowest fixing buckle 5 of the A-pillar guard plate 1 and the upper surface of the instrument panel 2 at the initial assembly position is 200-300mm. Due to the large weight of the instrument panel assembly, it is easy to sink in the actual vehicle state. Therefore, considering the size fluctuation of the instrument panel 2, the design range of the second vertical distance L2 between the rotation axis 6 of the A-pillar guard plate and the upper surface of the instrument panel 2 is 8-10mm. The design range of the design interference between the A-pillar guard plate 1 and the instrument panel 2 is the distance between the A-pillar guard plate 1 at the assembly completion position and the point where the A-pillar guard plate rotates to contact the instrument panel 2. If a soft instrument panel is used, the design range of the design interference is required to be ≤4mm. If a hard plastic instrument panel is used, the design range of the design interference is required to be ≤2mm.

[0066] In some optional embodiments, when the lateral distance range is not within the set distance range, the lateral distance range is re-obtained by adjusting the initial design distance so that there is an overlap between the lateral distance range and the set distance range.

[0067] In this embodiment, based on the initial design distance H′, the design range of the first vertical distance L1, the design range of the second vertical distance L2, and the design range of the design interference, and according to the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance, when the determined lateral distance range between the A-pillar guard plate rotation axis 6 and the instrument panel 2 is not within the design requirement's set distance range, the lateral distance range can be re-obtained by adjusting the position of the lowest fixing buckle, i.e., the initial design distance between the lowest fixing buckle and the A-pillar guard plate rotation axis 6, so that the lateral distance range overlaps with the set distance range. This ultimately yields an optimal lateral distance between the A-pillar guard plate rotation axis 6 and the instrument panel 2.

[0068] Furthermore, when the A-pillar trim surface and the dashboard surface change, since the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance has already been established, this relationship can be input into the computer. The initial design distance H′, the design range of the first vertical distance L1, the design range of the second vertical distance L2, and the design range of the design interference corresponding to the redesigned A-pillar trim 1 and dashboard 2 can then be used as... With the input, the layout area of ​​the A-pillar guard plate rotation axis 6 can be quickly calculated. Combined with the influence of other environmental factors, the position of the A-pillar guard plate rotation axis 6 can be adjusted within the feasible range to achieve the optimal solution for the design matching of A-pillar guard plate 1 and environmental components.

[0069] In this example, the vertical direction refers to the length direction of the A-pillar guard plate 1 when it is assembled, and the horizontal direction refers to the direction perpendicular to the vertical direction.

[0070] Figure 7 In the diagram, position A is the completed assembly position of the A-pillar guard plate 1, position B is the position when the A-pillar guard plate 1 contacts the instrument panel 2, and position C is the initial assembly position of the A-pillar guard plate 1.

[0071] In addition, the present invention also provides an A-pillar guard plate, which is designed using the A-pillar guard plate design method described in any of the above claims.

[0072] In summary, when designing the A-pillar guard using the above-mentioned A-pillar guard design method, the mating boundary line between the A-pillar guard and the instrument panel is determined based on the A-pillar guard's shaped curved surface and the instrument panel's shaped curved surface; the kinematic mating section between the A-pillar guard and the instrument panel is obtained at a set point on the mating boundary line; based on the kinematic mating section between the A-pillar guard and the instrument panel, the relationship between the design interference between the A-pillar guard and the instrument panel, the first vertical distance between the lowermost fixing buckle 5 of the A-pillar guard 1 at its initial assembly position and the upper surface of the instrument panel, the second vertical distance between the rotation axis of the A-pillar guard and the upper surface of the instrument panel, and the initial design distance between the lowermost fixing buckle and the rotation axis of the A-pillar guard is obtained; based on the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance, the lateral distance between the rotation axis of the A-pillar guard and the instrument panel is determined. This design method allows for setting the design interference amount based on the dashboard material. It enables the rapid and efficient determination of parameters such as the A-pillar trim clip height, A-pillar trim pin position, and A-pillar trim rotation axis position, while ensuring the interference between the A-pillar trim and the dashboard meets design requirements during A-pillar assembly and facilitates A-pillar trim assembly. This saves design and development time. Furthermore, by obtaining the design interference amount between the A-pillar trim and the dashboard, the first vertical distance between the lowermost fixing clip 5 of the A-pillar trim 1 at its initial assembly position and the upper surface of the dashboard, the second vertical distance between the A-pillar trim rotation axis and the upper surface of the dashboard, and the initial design distance between the lowermost fixing clip and the A-pillar trim rotation axis based on the motion mating cross-section, the design scheme can be rapidly and continuously iterated and updated when environmental components or the CAS (Compatibility and Design Components) of the A-pillar trim and the dashboard change. This shortens the design and development cycle and increases the design freedom of the A-pillar trim and dashboard CAS. This design method is applicable to all A-pillar trim designs with oblique insertion assembly methods, has a wide range of applications, and has significant potential for widespread adoption.

[0073] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0074] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0075] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for designing an A-pillar liner, characterized in that, Includes the following steps: Based on the A-pillar guard plate shaped surface and the instrument panel shaped surface, determine the mating boundary line (4) between the A-pillar guard plate (1) and the instrument panel (2). The kinematic fit section of the A-pillar guard plate (1) and the instrument panel (2) is obtained at a set point on the fit boundary line (4), where the set point is the midpoint on the fit boundary line (4); Based on the kinematic fit section of the A-pillar guard plate (1) and the instrument panel (2), the design interference between the A-pillar guard plate (1) and the instrument panel (2), the first vertical distance between the bottom fixing buckle (5) of the A-pillar guard plate (1) at the initial assembly position and the upper surface of the instrument panel (2), the second vertical distance between the rotation axis (6) of the A-pillar guard plate and the upper surface of the instrument panel (2), and the relationship between the bottom fixing buckle and the initial design distance between the rotation axis (6) of the A-pillar guard plate and the rotation axis (6) of the A-pillar guard plate are obtained. Based on the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance, the lateral distance between the A-pillar guard plate rotation axis (6) and the instrument panel (2) is determined, including: Based on the geometric relationship between the first vertical distance, the second vertical distance and the initial design distance, determine the angle between the initial assembly position and the assembly completion position of the A-pillar guard plate (1); Based on the geometric relationship between the angle between the A-pillar guard plate (1) at the initial assembly position and the assembly completed position, the distance between the intersection of the A-pillar guard plate (1) at the initial assembly position and the upper surface of the instrument panel (2) and the mating boundary line (4), and the design interference amount, determine the distance between the intersection of the A-pillar guard plate (1) at the initial assembly position and the upper surface of the instrument panel (2) and the mating boundary line (4). Based on the geometric relationship between the distance between the intersection of the A-pillar guard plate (1) and the upper surface of the instrument panel (2) at the initial assembly position and the mating boundary line (4), the second vertical distance, the first vertical distance, the initial design distance, and the lateral distance between the rotation axis (6) of the A-pillar guard plate and the instrument panel (2), the lateral distance between the rotation axis (6) of the A-pillar guard plate and the instrument panel (2) is determined.

2. The A-pillar guard plate design method as described in claim 1, characterized in that: According to the formula γ=arc tan(H / (L1+L2)), the angle γ between the initial assembly position and the assembly completion position of the A-pillar guard plate (1) is determined, where L2 is the second vertical distance, L1 is the first vertical distance, and H is the lateral distance between the bottom fixing buckle (5) of the A-pillar guard plate (1) and the assembly completion position.

3. The A-pillar guard plate design method as described in claim 2, characterized in that: According to the formula H= Determine the lateral distance H between the bottom fixing buckle (5) of the A-pillar guard plate (1) from the initial assembly position to the completed assembly position, where, This is the initial design distance.

4. The A-pillar guard plate design method as described in claim 3, characterized in that: According to the formula Z=L 干涉量 / cos arc tan(H / (L1+L2)), determine the distance between the intersection of the A-pillar guard plate (1) and the upper surface of the instrument panel (2) at the assembled position and the mating boundary line (4), where L 干涉量 The distance between the A-pillar guard plate (1) at the assembled position and the point where the A-pillar guard plate rotates to contact the instrument panel (2).

5. The A-pillar liner design method as described in claim 4, characterized in that, The lateral distance between the A-pillar guard plate rotation axis (6) and the instrument panel (2) includes: Based on the geometric relationship between the distance between the intersection of the A-pillar guard plate (1) and the upper surface of the instrument panel (2) at the initial assembly position and the mating boundary line (4), the second vertical distance, the first vertical distance, the initial design distance, and the lateral distance between the rotation axis (6) of the A-pillar guard plate and the instrument panel (2), the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance is determined. Based on the initial design distance, the design range of the first vertical distance, the design range of the second vertical distance, and the design range of the design interference, the lateral distance range between the A-pillar guard plate rotation axis (6) and the instrument panel (2) is determined according to the relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance. Based on the set distance range between the A-pillar guard plate rotation axis (6) and the instrument panel (2), the optimal lateral distance is selected within the lateral distance range.

6. The A-pillar guard plate design method as described in claim 5, characterized in that: The relationship between the design interference, the first vertical distance, the second vertical distance, and the initial design distance is Y = H * L2 / (L1 + L2) - L 干涉量 / cos arc tan(H / (L1+L2)).

7. The A-pillar guard plate design method as described in claim 6, characterized in that: The set distance range is 3-10mm.

8. The A-pillar guard plate design method as described in claim 6, characterized in that: When the lateral distance range is not within the set distance range, the lateral distance range is re-obtained by adjusting the initial design distance so that there is an overlap between the lateral distance range and the set distance range.

9. An A-pillar guard plate, characterized in that, Designed using the A-pillar liner design method as described in any one of claims 1-8.

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