A parametric design method for the main section of a vehicle without wheel arches

Abstract

The present invention relates to a parametric design method for a main section of a whole vehicle without wheel eyebrow, comprising inputting a tire envelope; finding three points for section positioning; importing this template by inserting a document instantiation; selecting corresponding three points according to template requirements for section positioning; changing basic parameters such as vehicle width, front wheel center distance, tire diameter, and tire maximum section width; changing wheel buckle Z-direction and Y-direction dimensions, and changing shotgun cavity Y-direction and Z-direction dimension requirements; adjusting wheel eyebrow angle, static tire and wheel eyebrow Z-direction distance; judging whether the minimum gap between the tire envelope and the wheel eyebrow meets the safety gap requirement; if so, generating a section, adding dimensions and annotations; if not, repeating steps G and H. The present invention is secondary developed based on CATIA application environment, making a template for drawing the main section of SL01, and realizing the parameterization of wheel mouth sections of different vehicle models by changing different parameters, serialized design, and greatly improving development efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to a parametric design method for a main section of a whole vehicle without a wheel eyebrow SL01. Background Art

[0002] Automobile design begins with hard point and parameter definitions, and the main section of the vehicle is an important means to verify whether these definitions are valid. The main section reflects the hard points and structural status of key parts of the car, and is input to the styling and three major (body / chassis / electrical) disciplines in the early stage of design to constrain styling and engineering design. It can realize the feasibility analysis and verification of the main structure of the vehicle body and runs through the entire process from renderings to the release of production-standard data.

[0003] The wheel opening SL01 is the main X section of the wheel opening, which mainly controls the aesthetics of the wheel opening, the safety gap between the tire envelope and the fender and wheel cover, etc. At present, this section is made by manual drawing.

[0004] The prior art discloses a method for optimizing a threshold structure based on a parametric model section. The threshold section optimization includes: first establishing a parametric model of the entire vehicle, then calculating the basic body torsional stiffness value of the parametric model, and taking the basic body torsional stiffness value as a constraint value, then selecting appropriate optimization variables, and determining the variable range based on the actual space and the feasibility of the stamping process, and finally selecting the variable value with the lowest mass and a body torsional stiffness value not lower than the basic body torsional stiffness value in the sample, so as to achieve lightweight analysis of the body without affecting the body torsional stiffness performance.

[0005] However, the above method is not suitable for the parametric design of the main section of the SL01 vehicle without wheel arches, and it is also impossible to improve the drawing efficiency while ensuring the aesthetics of the wheel opening and the safety of the vehicle. Summary of the invention

[0006] The purpose of the present invention is to provide a parametric design method for the main section of the whole vehicle without wheel eyebrow SL01, and to design an equal X-section template in the form of a front wheel opening without wheel eyebrow, so as to solve the problem of quickly obtaining this section by only confirming three points and several parameters, thereby greatly improving the drawing efficiency while ensuring the aesthetics of the wheel opening and the safety of the whole vehicle.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A parametric design method for a main section of a vehicle without a wheel arch comprises the following steps:

[0009] A. Input tire envelope;

[0010] B. Find the three points for section positioning: the Y0 point of the front wheel center, the 43° oblique tangent point of the tire envelope, and the highest point of the tire envelope in the Z direction;

[0011] C. Import this template by inserting the document instantiation;

[0012] D. Select three corresponding points according to the template requirements to locate the section;

[0013] E. Change basic parameters such as vehicle width, front wheel center distance, tire diameter, and maximum tire section width;

[0014] F. Change the Z and Y dimensions of the wheel buckle, and change the Y and Z dimension requirements of the shotgun cavity;

[0015] G. Adjust the fender angle and the Z-direction distance between the static tire and fender;

[0016] H. Determine whether the minimum gap between the tire envelope and the wheel arch meets the safety gap requirements;

[0017] I. If yes, generate the section, add dimensions and annotations; if no, repeat steps G-H.

[0018] Furthermore, in step A, while inputting the tire envelope, a cross section in the X direction is cut at the front wheel center position.

[0019] Further, in step B, three points for section positioning are found according to the general layout drawing.

[0020] Further, in step C, the template is named SL01-without wheel brow.CATPart.

[0021] Further, in step E, after the section positioning is confirmed, the parameter values ​​are changed, and the vehicle width, front wheel center distance, tire diameter, and maximum tire section width are changed according to project requirements.

[0022] Further, in step F, the dimensions of the wheel buckle in the Z and Y directions are changed according to the aesthetic requirements of the wheel opening, and the dimensions of the shotgun cavity in the Y and Z directions are changed according to the safety performance requirements.

[0023] Furthermore, in step G, it is also necessary to adjust the fender flange angle and fender flange size.

[0024] Further, in step H, the safety gap is required to be ≧3 mm.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention performs secondary development based on CATIA application environment, produces a template for drawing the main section of SL01, realizes parameterization of wheel opening sections of different vehicle models by changing different parameters, and performs serialized design, thereby greatly improving development efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 SL01 cross section example;

[0029] Figure 2 Flowchart of the parametric design method of the main section of the whole vehicle without wheel eyebrow SL01 of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with embodiments:

[0031] like Figure 1-Figure 2 As shown, the parametric design method of the main section of the whole vehicle without wheel eyebrow of the present invention comprises the following steps:

[0032] A. Input the tire envelope and cut an equal X-direction section at the front wheel center position to find the three points in step B;

[0033] B. According to the general layout drawing, find three points for section positioning: the Y0 point of the front wheel center, the 43° oblique tangent point of the tire envelope, and the highest point of the tire envelope in the Z direction;

[0034] C. Import this template by inserting the document instantiation, and name the template SL01-without wheelbrow.CATPart;

[0035] D. Select three corresponding points according to the template requirements to locate the section;

[0036] E. Change the parameter values ​​after confirmation, and change the basic parameters such as vehicle width, front wheel center distance, tire diameter, and maximum tire section width according to the project requirements; so as to adjust the section according to the basic requirements of different project models;

[0037] F. Change the Z and Y dimensions of the wheel opening according to the aesthetic requirements of the wheel opening, and change the Y and Z dimensions of the shotgun cavity according to the safety performance requirements; so as to adjust the section according to the special requirements of different project models;

[0038] G. Adjust the fender and fender flange angles, fender flange dimensions, and the Z-direction distance between the static tire and the fender, so that the cross section meets the requirements of step H during the adjustment;

[0039] H. Determine whether the minimum gap between the tire envelope and the wheel arch meets the safety gap requirement, generally ≥ 3mm; in order to check whether the tire interferes with the wheel arch during movement;

[0040] I. If yes, generate the section, add dimensions and annotations; if no, repeat steps G to H. Repeat the adjustments until the requirements are met, and finally generate the section.

[0041] In the present invention, the dimensions to be controlled are:

[0042] To ensure the aesthetics of the wheel opening: Dimension 1: Z-direction dimension between fender 1 and static tire; Dimension 2: Y-direction dimension between fender 1 and static tire;

[0043] Safety clearance: Dimension 3: minimum clearance between tire envelope and fender; Dimension 4: minimum clearance between tire envelope and wheel cover;

[0044] Safety requirements: Dimension 5: Z-height of the shotgun cavity; Dimension 6: Y-height of the shotgun cavity;

[0045] The parametric design method of the main section of the whole vehicle without fenders of the present invention can produce a template of the section of SL01 without fenders. This template is suitable for drawing various models of the scheme without fenders; this template takes into account the feasibility and safety requirements of the project; this template can generate different scheme sections of the same model by adjusting the parameter values, providing selectivity; this parametric template greatly improves the drawing time.

[0046] The present invention performs secondary development based on the CATIA application environment and designs an equal X-section template of the front wheel opening without wheel arch. This section can be quickly obtained by simply confirming three points and several parameters. Under the premise of ensuring the aesthetics of the wheel opening and the safety of the entire vehicle, the drawing efficiency is greatly improved.

[0047] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A parametric design method for the main section of a vehicle without wheel arches, characterized in that: The following steps are involved: A. Input tire envelope; B. Find the three points for section positioning: the Y0 point of the front wheel center, the 43° oblique tangent point of the tire envelope, and the highest point of the tire envelope in the Z direction; C. Import the template by inserting the document instantiation; D. Select three corresponding points according to the template requirements to locate the section; E. Change basic parameters such as vehicle width, front wheel center distance, tire diameter, and maximum tire section width; F. Change the Z and Y dimensions of the wheel buckle, and change the Y and Z dimension requirements of the upper longitudinal beam cavity; G. Adjust the fender angle and the Z-direction distance between the static tire and fender; H. Determine whether the minimum gap between the tire envelope and the wheel arch meets the safety gap requirements; I. If yes, generate the section, add dimensions and annotations; if no, repeat steps G-H.

2. The parametric design method of the main section of a vehicle without wheel arch according to claim 1, characterized in that: Step A, input the tire envelope and cut an equal X-direction section at the front wheel center position.

3. The parametric design method of the main section of a vehicle without wheel arch according to claim 1, characterized in that: Step B: Find the three points for section positioning according to the general layout drawing.

4. The parametric design method of the main section of a vehicle without wheel arches according to claim 1 is characterized in that: Step C, name the template SL01-without wheel brow.CATPart.

5. The parametric design method of the main section of a vehicle without wheel arches according to claim 1 is characterized in that: Step E: After the section positioning is confirmed, change the parameter values ​​and change the vehicle width, front wheel center distance, tire diameter, and maximum tire section width according to project requirements.

6. The parametric design method of the main section of a vehicle without wheel arches according to claim 1 is characterized by: Step F, change the Z and Y dimensions of the wheel buckle according to the aesthetic requirements of the wheel opening, and change the Y and Z dimensions of the upper longitudinal beam cavity according to the safety performance requirements.

7. The parametric design method of the main section of a vehicle without wheel arches according to claim 1 is characterized by: Step G, it is also necessary to adjust the fender flange angle and fender flange size.

8. The parametric design method of the main section of a vehicle without wheel arches according to claim 1 is characterized by: Step H: the safety gap is required to be ≥ 3 mm.

Images