Method for setting a lower split line position of a vehicle door

Abstract

The application discloses a kind of setting methods of vehicle door lower split joint line position, including generating alignment data;According to the first distance and the second distance of alignment data, the second distance is preset range between 0~15mm;According to the corresponding vehicle door outer plate data model of vehicle door lower split joint line, the third distance is not less than between vehicle door outer plate and curb and pedestrian road surface when full load under preset opening angle;Third distance, and the overlap of vehicle door and threshold is checked;If the effect review is unqualified after checking, then reset parameter, and third distance, and the overlap of vehicle door and threshold is checked;The application is used for the conceptual design stage, engineering design stage and data check and check of vehicle development;The application solves the design problem of vehicle door lower split joint line from design source, avoids the problem of repeated optimization and modification data due to unreasonable definition of vehicle door lower split joint line, not only shortens design verification period, but also obviously contributes to vehicle quality and side impact performance improvement.

Description

Technical Field

[0001] This invention relates to the field of vehicle structural design technology, and in particular to a method for setting the position of the lower seam line of a car door. Background Technology

[0002] Vehicle doors are crucial passageways for passengers to enter and exit the vehicle. During the door design process, the arrangement of hinges, the shape of the door seams, and the definition of the seam width are all critical aspects. In this process, designers often focus more on the vertical seam line design, neglecting the lower seam line. The appropriateness of the lower seam line's position directly affects vehicle quality. At best, it can cause the door to collide with curbs or sidewalks during opening, damaging the door; at worst, it can affect side-impact performance, resulting in excessive door intrusion and increasing the risk of occupant injury. This invention describes a method for setting the lower seam line, including its position, opening verification, and side-impact performance. It has been successfully applied in several of our company's vehicle models. Summary of the Invention

[0003] The purpose of this invention is to provide a method for setting the position of the lower seam of a car door, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for setting the position of the lower seam line of a car door, comprising:

[0005] Generate benchmarking data, which includes threshold data, door hinge axis data, and CAS data of door seam lines, as well as a road condition model established according to urban road engineering design specifications, which includes road surface data, curbstone data, and sidewalk road surface data.

[0006] Based on benchmark data, a first distance and a second distance are preset. The first distance is the distance between the lower parting line of the car door and the ground line when the car door is unloaded. The second distance is the height difference between the front and rear ends of the lower parting line of the car door. The preset range of the second distance is between 0 and 15 mm.

[0007] Establish a corresponding door outer panel data model based on the lower seam line of the door. Rotate the door outer panel data model around the corresponding door hinge axis by a preset opening angle. When fully loaded, the distance between the door outer panel and the curb and the sidewalk should not be less than the third distance. The third distance is the minimum height set between the door outer panel and the curb and the sidewalk when fully loaded.

[0008] The third distance and the overlap between the car door and the door sill were checked;

[0009] If the effect review fails after verification, the first distance, second distance, opening angle and third distance are reset, and the third distance and the overlap between the door and the door sill are verified.

[0010] If the effect review is satisfactory, the design scheme for the lower seam position of the car door will be approved.

[0011] Furthermore, based on the benchmark data, the preset first and second distances also include:

[0012] Based on the benchmark data analysis, the preset first distance is 275mm.

[0013] Furthermore, the second distance preset range is between 0 and 15 mm, and also includes:

[0014] When the second distance is controlled within the range of 0 to 15 mm, the specific value of the second distance is set in conjunction with the cross-sectional height of the threshold beam.

[0015] Furthermore, rotating the data model of the outer door panel around the corresponding door hinge axis by a preset opening angle also includes:

[0016] The door outer panel data model includes the front door outer panel data model and the rear door outer panel data model, and the door hinge axis data includes the front door hinge axis data and the rear door hinge axis data.

[0017] Rotate the front door outer panel data model and the rear door outer panel data model around the front door hinge axis and the rear door hinge axis respectively by a preset opening angle;

[0018] Based on the definition of the door hinge structure, the opening angles of the front and rear doors are controlled to ensure that the third distance meets the design requirements.

[0019] Furthermore, ensuring that the third distance meets design requirements also includes:

[0020] The overlap between the door and the side sill is set to L≥60mm.

[0021] Furthermore, the verification of the third distance and the overlap between the car door and the door sill also includes:

[0022] Based on aesthetic design and overall vehicle manufacturing processes, the first and second distances of the lower seam line on the car door were optimized.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the present invention provides a solution for reasonably defining the position of the lower seam of the car door, avoiding collisions with the curb or sidewalk during the opening of the car door, and ensuring the side impact performance of the vehicle.

[0024] The method described in this invention is applicable to the conceptual design, engineering design, and data checking and verification stages of vehicle development. In the conceptual design stage, this invention provides design references for the cross-sectional design of vehicle door sills, sill height, passability, and visibility definitions. In the engineering design stage, this invention provides technical guarantees for optimizing vehicle body structure, locking door gap positions, and improving side-impact performance. During DMU data checking and verification, this invention provides technical support to ensure the quality of design data.

[0025] This invention solves the design problem of the lower door seam line from the design source, avoiding the problem of repeated optimization and data modification due to unreasonable definition of the lower door seam line. It not only shortens the design verification cycle, but also makes a significant contribution to improving the overall vehicle quality and side impact performance. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating a method for setting the position of the lower seam line of a car door according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of a road section according to the Urban Road Engineering Design Code (CJJ37-2016) in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the CAS data of the threshold data, door hinge axis data, and door seam line generated in an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram illustrating the lower seam line setting of the car door in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram illustrating the opening verification of the front and rear doors in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the cross-sectional structure of the car door and door sill in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the vehicle benchmarking data model in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the data model of the pre-set lower seam line of the vehicle door in an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the data model of the front door outer panel and the rear door outer panel in an embodiment of the present invention;

[0035] Figure 10 This is a schematic diagram showing the front and rear doors fully open in an embodiment of the present invention;

[0036] Figure 11This is a schematic diagram showing the distance between the front and rear doors and the sidewalk when the vehicle is fully loaded in this embodiment of the invention.

[0037] Figure 12 This is a schematic diagram of the optimized lower seam line of the car door in an embodiment of the present invention;

[0038] Figure 13 This is a schematic diagram of the sill section after the optimization of the lower seam line of the car door in an embodiment of the present invention;

[0039] Figure 14 This is a logic block diagram of a method for setting the position of the lower seam line of a car door according to an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] Please refer to the accompanying drawings. This invention provides a technical solution: a method for setting the position of the lower seam line on a car door, comprising the following steps:

[0044] S102. Generate benchmarking data, which includes threshold data, door hinge axis data, and CAS data of door seam lines, as well as a road condition model established according to urban road engineering design specifications, which includes road surface data, curbstone data, and sidewalk road surface data.

[0045] Among them, such as Figure 2 , 3 As shown, the first step is to establish benchmark data, including the front and rear door hinge axes, door CAS or A-side data with door seam line data, and road surface, curb and sidewalk pavement models as specified in the Urban Road Engineering Design Specification (CJJ37-2016).

[0046] S104. Based on the benchmark data, preset a first distance and a second distance, wherein the first distance is the distance between the lower parting line of the door and the ground line when unloaded, and the second distance is the height difference between the front and rear ends of the lower parting line of the door. The preset range of the second distance is between 0 and 15 mm.

[0047] Specifically, based on the analysis of benchmark data, the preset first distance is 275mm.

[0048] Among them, such as Figure 4 As shown, after extensive benchmarking data analysis, the distance between the lower seam line of the car door and the unloaded ground line is generally around 275mm, mainly affected by the hinge axis inclination angle, suspension spring performance, and the attitude of the ground line under various loads. We initially assume the distance between the lower seam line of the car door and the unloaded ground line is 275mm.

[0049] When the second distance is controlled within the range of 0 to 15 mm, the specific value of the second distance is set in conjunction with the cross-sectional height of the threshold beam.

[0050] Among them, such as Figure 4 As shown, based on the structural characteristics of the door sill beam, the cross-sectional height of the door sill beam is generally equal, and the upper and lower stops of the door sill beam are generally arranged horizontally. In order to ensure the stability of the front and rear doors during side collisions, the lower parting line of the door is generally designed to be horizontal or slightly upward. However, the drop between the front and rear ends of the lower parting line of the door is controlled within the range of 0 to 15 mm, and the specific value is set in combination with the cross-section at the door sill.

[0051] This invention allows for the parameterized preset position of the lower door seam, which can be adjusted at any time according to changes in the shape and hinge axis parameters.

[0052] S106. Establish a corresponding door outer panel data model based on the lower seam line of the door. Rotate the door outer panel data model around the corresponding door hinge axis by a preset opening angle. When fully loaded, the distance between the door outer panel and the curb and the sidewalk should not be less than the third distance. The third distance is the minimum height set between the door outer panel and the curb and the sidewalk when fully loaded.

[0053] Specifically, the door outer panel data model includes the front door outer panel data model and the rear door outer panel data model, and the door hinge axis data includes the front door hinge axis data and the rear door hinge axis data.

[0054] Rotate the front door outer panel data model and the rear door outer panel data model around the front door hinge axis and the rear door hinge axis respectively by a preset opening angle;

[0055] Based on the definition of the door hinge structure, the opening angles of the front and rear doors are controlled to ensure that the third distance meets the design requirements.

[0056] Among them, such as Figure 5 As shown, data models of the front and rear door outer panels are created based on the initially set lower seam line of the car door. The front and rear outer panel data models are rotated by preset angles around the hinge axes of the front and rear doors, typically 70° for the front door and 80° for the rear door. These angles can be defined according to the actual hinge structure. It is ensured that the distance between the outer panels and the fully loaded curb and sidewalk model is not less than the requirement of a third distance, preferably 25mm. Therefore, this invention fully considers the driving environment; under full load, the distance between the door and the curb or sidewalk surface during opening is ≥25mm to avoid door collisions. Figure 5 The diagram also illustrates the positional relationship between the tire and the curb, as well as the positional relationship between the tire and the fully loaded ground line.

[0057] Specifically, the overlap between the door and the side sill is set to L≥60mm.

[0058] Understandably, such as Figure 6 As shown, considering vehicle manufacturing and assembly deviations, road surface deviations, and icy sidewalks in northern cities during rain and snow, the design ensures that the car door will not collide when opened. The third distance should not be too large, only meeting design requirements. If this value is too large, the lower door seam will be too high. For ordinary sedans, this would result in insufficient overlap between the lower door seam and the side sill. During a side collision, the lower part of the door would lack adequate support, increasing intrusion and potentially causing excessive injury to occupants. Therefore, the overlap between the door and side sill is generally set to L ≥ 60mm. The sill includes the side sill and sill trim panel. The side sill is the inner side panel of the side support panel. The inner door panel and the inner side panel are correspondingly designed. When the door is closed, the inner side panel and the inner door panel partially overlap; this overlap is the door-side sill overlap. This invention scientifically defines the sill cross-sectional shape and the door-side sill overlap setting to improve overall vehicle collision performance.

[0059] S108. Verify the third distance and the overlap between the door and the door sill;

[0060] Specifically, the appropriate position of the lower parting line of the car door is determined by adjusting the distance between the lower parting line and the unloaded ground line, as well as the drop value between the front and rear ends of the lower parting line.

[0061] S110, such as Figure 14 As shown, if the effect review fails after verification, the first distance, second distance, opening angle and third distance are reset, and the third distance and the overlap between the door and the door sill are checked. If the effect review is successful, the setting scheme for the lower parting line position of the door is approved.

[0062] Optionally, checking the third distance and the overlap between the door and the sill also includes:

[0063] Based on aesthetic design and overall vehicle manufacturing processes, the first and second distances of the lower seam line on the car door were optimized.

[0064] Among these factors, the appropriate position of the lower door seam is determined by considering aesthetics, ease of getting in and out of the vehicle, body structure, collision performance, and overall vehicle manufacturing process.

[0065] In the above embodiments, this invention comprehensively considers the lower seam position of the car door from the initial design stage, taking into account factors such as overall vehicle collision performance, overall vehicle manufacturing process, aesthetics of the styling seams, and the actual usage of the vehicle. It also fully considers the country of use and environment of the vehicle model, rationally designing the lower seam position of the car door to avoid inconvenience for customers during use and prevent customer complaints. Furthermore, it utilizes parametric design software like CATIA to quickly optimize the design.

[0066] The following specific examples will illustrate the setting method of the present invention in detail:

[0067] Front door hinge axis, rear door hinge axis, external CAS data with vertical split, urban road reference model. For example... Figure 7 As shown, the initial distance between the lower seam of the car door and the unloaded ground line is set to 275mm. Figure 8 As shown, the lower seam of the car door rises at the rear end and the initial height difference between the front and rear ends is set at 15mm.

[0068] like Figure 9 As shown, data models of the front and rear door outer panels are created based on the door seam lines.

[0069] like Figure 10 As shown, the front and rear door data models are rotated by corresponding angles around their respective hinge axes. For this model, the front door is rotated by 65 degrees and the rear door by 72 degrees.

[0070] like Figure 11 As shown, under full load, the distance between the front door and the curb or sidewalk is 52.5mm when the front door is opened, and the distance between the rear door and the curb or sidewalk is 50.4mm when the rear door is opened.

[0071] like Figure 12 As shown, from a model verification perspective, the lower door seam line has approximately 25mm of downward adjustment space. Taking into account factors such as ease of entry and exit, vehicle structure, collision safety, and overall vehicle manufacturing processes, the lower door seam line was optimized, and a reasonable position was ultimately determined. The minimum distance between the lower door seam line and the unloaded ground line is 265mm, and the height difference between the front and rear ends of the lower door seam is 5mm. Under full load conditions, the minimum distance between the front door and the curb or sidewalk during opening is 27.4mm, and the minimum distance between the rear door and the curb or sidewalk during opening is 26.7mm. When the front and rear doors are fully opened, the difference in distance between the front and rear doors and the curb or sidewalk should be minimized, generally controlled within 5mm.

[0072] like Figure 13 As shown, it meets the requirements for aesthetic design, ease of getting in and out of the vehicle, body structure, overall vehicle manufacturing process, and side impact performance, with L = 70mm.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for setting the position of the lower seam line of a car door, characterized in that, include: Generate benchmarking data, which includes threshold data, door hinge axis data, and CAS data of door seam lines, as well as a road condition model established according to urban road engineering design specifications, which includes road surface data, curbstone data, and sidewalk road surface data. Based on benchmark data, a first distance and a second distance are preset. The first distance is the distance between the lower parting line of the car door and the ground line when the car door is unloaded. The second distance is the height difference between the front and rear ends of the lower parting line of the car door. The preset range of the second distance is between 0 and 15 mm. Establish a corresponding door outer panel data model based on the lower seam line of the door. Rotate the door outer panel data model around the corresponding door hinge axis by a preset opening angle. When fully loaded, the distance between the door outer panel and the curb and the sidewalk should not be less than the third distance. The third distance is the minimum height set between the door outer panel and the curb and the sidewalk when fully loaded. The third distance and the overlap between the car door and the door sill were checked; If the effect review fails after verification, the first distance, second distance, opening angle and third distance are reset, and the third distance and the overlap between the door and the door sill are verified. If the effect review is satisfactory, the design scheme for the lower seam position of the car door will be approved.

2. The method for setting the position of the lower seam line of a car door according to claim 1, characterized in that, Based on the benchmark data, a first and second distance are preset, which also includes: Based on the benchmark data analysis, the preset first distance is 275mm.

3. The method for setting the position of the lower seam line of a car door according to claim 1, characterized in that, The second distance preset range is between 0 and 15 mm, and also includes: When the second distance is controlled within the range of 0 to 15 mm, the specific value of the second distance is set in conjunction with the cross-sectional height of the threshold beam.

4. The method for setting the position of the lower seam line of a car door according to claim 1, characterized in that, Rotating the car door outer panel data model around the corresponding door hinge axis by a preset opening angle also includes: The door outer panel data model includes the front door outer panel data model and the rear door outer panel data model, and the door hinge axis data includes the front door hinge axis data and the rear door hinge axis data. Rotate the front door outer panel data model and the rear door outer panel data model around the front door hinge axis and the rear door hinge axis respectively by a preset opening angle; Based on the definition of the door hinge structure, the opening angles of the front and rear doors are controlled to ensure that the third distance meets the design requirements.

5. The method for setting the position of the lower seam line of a car door according to claim 4, characterized in that, Ensuring that the third distance meets design requirements also includes: The overlap between the door and the side sill is set to L≥60mm.

6. The method for setting the position of the lower seam line of a car door according to claim 1, characterized in that, The verification of the third distance and the overlap between the car door and the door sill also includes: Based on aesthetic design and overall vehicle manufacturing processes, the first and second distances of the lower seam line on the car door were optimized.

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