Automobile wheel eyebrow boundary construction method

Abstract

The invention provides an automobile wheel eyebrow boundary construction method, and relates to the technical field of automobiles. According to the method, the maximum tire movement envelope is created according to chassis arrangement and suspension run-out, a wheel trim boundary limiting line can be provided based on the requirements of laws and regulations, the wheel trim modeling range is limited, and the accuracy of the wheel trim boundary position and the modeling construction efficiency are improved. According to modeling analysis and structural design of the wheel trim, the included angle between the outline of the wheel trim and the molded surface of the vehicle body and the included angle between the buckle on the wheel trim body and the axis of the vehicle body mounting hole are provided, so that tight attachment of the wheel trim and the vehicle body is guaranteed, the development period of the wheel trim is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, in particular to a method for constructing a wheel eyebrow boundary of an automobile. Background Art

[0002] The fender is located on the upper edge of the tire. It is a semicircular decorative part protruding outward from the fender. Its functions include decoration, scratch prevention, personalization, and increasing the width of the car body. Therefore, the design of the fender and wheel cover of the car needs to fully consider the aesthetics, legality, and safety and reliability. During the development of the fender, the inspection frequency of regulations, styling, and feasibility analysis will increase due to the continuous adjustment of the styling.

[0003] How to provide engineering support restrictions for styling and define the fender installation structure while meeting regulations is an important way to solve this problem. Summary of the invention

[0004] In response to the above problems, the present application provides a method for constructing a car fender boundary, which can effectively improve the accuracy of the position of the fender and wheel cover boundary and the efficiency of the shape construction.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A method for constructing a car fender boundary comprises the following steps:

[0007] S1, according to the vehicle layout, obtain the vehicle width ZW and define the unloaded ground line;

[0008] S2, creates tire envelope section A1 based on vehicle layout and suspension runout;

[0009] S3, based on the vehicle layout, defines the minimum ground clearance of the fender H1, the safety gap between the fender and the tire H2, and the tire size covered by the fender W2;

[0010] S4, build wheel eyebrow shape;

[0011] S5, fender structure design.

[0012] Further, the S4 comprises the following steps:

[0013] 4.1 Based on the parameters determined in steps S1, S2 and S3, construct a preliminary shape of the fender;

[0014] 4.2 Check the compliance of the preliminary fender shape constructed in step 4.1;

[0015] 4.3 Analyze the installation convenience of wheel arches.

[0016] Further, step 4.2 includes,

[0017] 4.21 The outer edge of the wheel arch is located on the outer side of the tire within the cross-sectional angle range;

[0018] 4.22 The rear edge of the fender should be above the plane where the wheel center is located and below the horizontal plane 150mm above the wheel center;

[0019] 4.23 The intersection points G1 and G2 of the edge of the fender and the horizontal plane 150 mm above the wheel center are located outside the longitudinal median plane of the tire;

[0020] 4.24 The depth p1 of the outer edge of the fender should not be less than 30 mm when measured in a transverse vertical plane passing through the center of the wheel;

[0021] 4.25 The distance between the lower edge of the fender and the center of the wheel is c1≤2r, where r is the static radius of the wheel.

[0022] 4. A method for constructing a car fender boundary according to claim 3, characterized in that: the cross-sectional angle includes an area formed by two radiating planes at 30° forward and 50° backward from the wheel center.

[0023] Furthermore, in the area formed by the two radial planes 30° forward and 50° backward of the wheel center, the depth of the outer edge of the wheel arch gradually decreases from the center to both sides to zero.

[0024] Furthermore, the step 4.3 is specifically as follows: in the vehicle coordinates, the fender assembly direction is defined as the horizontal direction, and the angle between the fender outer profile and the assembly direction is θ2, then the angle between the fender outer profile and the vehicle body surface in the vehicle coordinates is θ1=90°-θ2;

[0025] If θ1 ≥ 80°, the structural design can be performed;

[0026] If 70°≤θ1≤80°, simulate the installation feasibility;

[0027] If θ1≤70°, repeat steps 4.1-4.3.

[0028] Further, the S5 comprises the following steps:

[0029] 5.1 Based on the fender shape determined in step S5, a preliminary fender vertical section structure is created;

[0030] 5.2 Design a buckle seat on the fender body obtained in step 5.1, and determine the main positioning, spoke positioning and mounting holes;

[0031] 5.3 Select the buckle specifications.

[0032] 5.4 Move the travel W3 toward the outside of the vehicle body along the fender assembly direction Y1, the angle between the center point line of the two positions of the buckle and the buckle axis is θ3, then the installation offset of the buckle in the Z direction Δx = tanθ3 × W3;

[0033] 5.5 Calculate the installation offset Δx of the radial positioning and mounting holes according to the formula provided in step 5.4;

[0034] If Δx≤L2, it is considered to meet the structural design requirements;

[0035] If L2<Δx≤L2+0.2mm, the sample needs to be tested and verified before release;

[0036] If Δx>L2+0.2mm, the structure needs to be optimized and steps 5.2-5.5 need to be repeated.

[0037] Furthermore, when creating the preliminary wheel eyebrow vertical section structure, the DTS between the wheel eyebrow and the vehicle body surface is ≤ 0 ~ (-0.5) mm.

[0038] Furthermore, when creating the preliminary fender vertical section structure, the thickness of the fender body is determined to be T based on the fender shape, molding process and material properties.

[0039] Furthermore, when designing the buckle seat, the distance L1 between the buckle seat and the edge of the wheel arch is ≤30 mm.

[0040] The beneficial effects of the present invention are:

[0041] A method for constructing a car fender boundary provided in an embodiment of the present application creates a maximum tire motion envelope according to the chassis layout and suspension bounce, and can provide a fender boundary limit line based on regulatory requirements to limit the fender styling range, thereby improving the accuracy of the fender boundary position and the efficiency of styling construction, reducing the fender development cycle, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the fender compliance requirements of a method for constructing a fender boundary of an automobile provided in an embodiment of the present application;

[0043] Figure 2 for Figure 1 AA section view in;

[0044] Figure 3 for Figure 1 BB section view in;

[0045] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A;

[0046] Figure 5 for Figure 1CC section view in;

[0047] Figure 6 It is a schematic diagram of the analysis of the fender profile and the body surface;

[0048] Figure 7 Schematic diagram of the assembly displacement of the vertical section of the wheel arch.

[0049] In the figure: 1. unloaded ground line; 2. left side outline of the vehicle; 3. right side outline of the vehicle; 41. fender body; 411. fender outline; 42. buckle seat; 5. tire; 6. wheel cover; 7. body surface; 71. body mounting hole; 72. body flange; 8. buckle; 81. buckle shaft; 82. buckle wing; 83. buckle axis; 9. fastener. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application, and the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art without creative work on the basis of the embodiments of the present application shall belong to the protection scope of the present application.

[0051] For the convenience of description, the direction in which the vehicle moves forward is defined as the longitudinal direction, the horizontal direction perpendicular to the direction in which the vehicle moves forward is defined as the lateral direction, and the vertical direction perpendicular to the direction in which the vehicle moves forward is defined as the vertical direction.

[0052] like Figure 1 , Figure 2 and Figure 3 As shown, the wheel guard includes a wheel eyebrow and a wheel cover 6, and the wheel eyebrow and wheel cover 6 are located above the tire 5. The wheel eyebrow includes a wheel eyebrow body 41 and a buckle 8, and the wheel eyebrow body 41 is injection molded and is provided with a buckle seat 42. The buckle 8 is small in front and large in the back, and is provided with a buckle wing 82 and a clamping shaft 81. The buckle is clamped into the buckle seat 42 through the clamping shaft 81, and the buckle wing 82 is elastically deformable and abuts against the body surface 7. After the buckle 8 is clamped, the buckle wing 82 returns to its original size, and the wheel eyebrow outer profile 411 abuts against the body surface 7. The wheel cover 6 is located above the tire 5, as shown in FIG. Figure 4 As shown, its edge is installed between the wheel arch body 41 and the vehicle body flange 72 and fixed by a fastener 9.

[0053] A method for constructing a car fender boundary includes a shape design and a structure design, and specifically includes the following steps:

[0054] S1, such as Figure 1 and Figure 2As shown in the figure, according to the vehicle layout and the requirements of GB 1589 "Limits for the Dimensions, Axle Loads and Masses of Motor Vehicles, Trailers and Semi-trailers", the vehicle width ZW is obtained, and the no-load ground line 1 is defined. The vehicle width ZW starts and ends at the outer contour line on the right side of the vehicle to the outer contour line 2 on the left side of the vehicle.

[0055] S2, as Figure 1 and Figure 2 shown in the figure, based on the vehicle layout and suspension movement, the tire 5 envelope cross-section A1 is created. The tire 5 envelope cross-section A1 is the profile of the maximum tire 5 envelope.

[0056] S3, as Figure 2 and Figure 3 shown in the figure, based on the vehicle layout, the minimum ground clearance H1 of the wheel arch, the safety clearance H2 between the wheel arch and the tire 5 envelope, and the size W2 of the wheel arch covering the tire 5 are defined. If anti-skid chains are considered to be installed, then H2 ≥ 20 mm. To reserve space for selecting more tire 5 specifications, the W2 should preferably be 26 mm.

[0057] S4, construct the wheel arch shape.

[0058] 4.1 Based on the basic parameters determined in steps S1, S2 and S3, construct the preliminary wheel arch shape.

[0059] 4.2 Based on the requirements of GB 7063 "Motor Vehicle Wheel Arch Liners", conduct compliance verification on the preliminary wheel arch shape constructed in step 4.1, including the following requirements.

[0060] 4.21 As Figure 2 shown in the figure, within the cross-section angle range, the outer edge of the wheel arch is located outside the tire 5. The cross-section angle includes the area formed by two radiation planes 30° forward and 50° backward from the wheel center.

[0061] 4.22 As Figure 1 shown in the figure, the trailing edge A2 of the wheel arch should be above the plane where the wheel center is located and below the horizontal plane 150 mm above the wheel center, that is, the trailing edge height r < H3 ≤ r + 150 mm. In this way, the position of the trailing edge of the wheel arch can be restricted, thus avoiding damage to the vehicle by stones, mud and snow.

[0062] 4.23 Figure 5 shown in the figure, the intersection points G1, G2 of the edge of the wheel arch and the horizontal plane 150 mm above the wheel center must be outside the longitudinal middle plane of the tire 5.

[0063] 4.24 As Figure 3As shown in the figure, the outer edge depth p1 of the wheel arch shall be no less than 30mm when measured in a transverse vertical plane passing through the center of the wheel, so as to reduce the air turbulence at the bottom of the vehicle and improve the stability of the vehicle. In the area formed by the two radial planes 30° forward and 50° backward of the wheel center, the outer edge depth of the wheel arch gradually decreases from the center to both sides to zero.

[0064] 4.25 Figure 3 As shown, the distance between the lower edge of the wheel arch and the center of the wheel is c1≤2r, where r is the static radius of the wheel.

[0065] 4.3 Analyze the installation convenience of wheel arches.

[0066] like Figure 6 As shown, the fender assembly direction is defined as Y1, and Y1 = 90°, that is, the fender assembly direction is horizontal in the vehicle coordinate. In this way, when assembling the fender, the assembly can be completed by a flat push method, which is convenient for installation.

[0067] The angle between the fender outer profile 411 and the assembly direction is θ2, and the angle between the fender outer profile 411 and the body surface 7 in the vehicle coordinates is θ1=90°-θ2. The smaller θ2 is, the larger θ1 is, which is closer to the assembly direction and more conducive to fender installation.

[0068] (1) If the included angle θ1 between the fender outer profile 411 and the vehicle body profile 7 is ≥ 80°, the structural design can be performed.

[0069] (2) If the angle between the fender outer profile 411 and the vehicle body surface 7 is 70°≤θ1≤80°, the installation feasibility is simulated by using the DMU of CATIA.

[0070] (3) If the angle θ1 between the fender outline 411 and the vehicle body surface 7 is ≤ 70°, repeat steps 4.1 to 4.3.

[0071] S5, fender structure design.

[0072] 5.1 Based on the fender assembly direction and the fender shape determined in step S5, a preliminary fender vertical section structure is created, wherein the DTS between the fender and the vehicle body surface 7 is ≤ 0 to (-0.5) mm, and the thickness of the fender body 41 is T.

[0073] The DTS is an industry term used to represent the size, gap and flushness between two parts. The thickness of the fender body 41 needs to be determined based on the fender shape, molding process and material properties.

[0074] 5.2 Design a buckle seat 42 on the fender body 41 obtained in step 5.1, and determine the main positioning, spoke positioning and mounting holes. The distance between the buckle seat 42 and the fender edge is L1, and the L1 is ≤ 30 mm.

[0075] 5.3 Select the buckle 8 specification.

[0076] When the buckle 8 is installed on the main positioning buckle seat 42, the buckle 8 is used as the main positioning of the wheel eyebrow, and the movable amount L2≤0.2mm;

[0077] When the buckle 8 is installed on the spoke positioning buckle seat 42, the buckle 8 is used as a wheel eyebrow spoke positioning, and the movable amount is 0.2mm<L2≤0.5mm;

[0078] When the buckle 8 is installed on the mounting hole buckle seat 42, the movable range of the buckle 8 is 0.5mm<L2≤1.2mm.

[0079] 5.4 As Figure 7 As shown, the movement distance W3 is along the fender assembly direction Y1 toward the outside of the vehicle body, and the angle between the center point line of the two positions of the buckle 8 and the buckle axis 83 is θ3, then the installation offset of the buckle 8 in the Z direction Δx=tanθ3×W3.

[0080] W3 is the minimum distance that the selected buckle 8 can withdraw from the vehicle body surface 7 .

[0081] 5.5 Calculate the installation offset Δx of the radial positioning and mounting holes according to the formula provided in step 5.4.

[0082] If Δx≤L2, it is considered to meet the structural design requirements;

[0083] If L2<Δx≤L2+0.2mm, the sample needs to be tested and verified before release;

[0084] If Δx>L2+0.2mm, it is necessary to optimize the structure, adjust the buckle 8 structure or the vehicle body surface 7, and repeat steps 5.2-5.5 until Δx meets the requirements.

[0085] Other embodiments obtained by those skilled in the art by combining, splitting, reorganizing, etc. the embodiments of the present application on the basis of the embodiments provided in the present application do not exceed the protection scope of the present application.

[0086] The above specific implementation methods have detailed the purpose, technical solutions and beneficial effects of the embodiments of the present application. The above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. That is, any modifications, equivalent substitutions, improvements, etc. made on the basis of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A method for constructing a car fender boundary, characterized in that: The following steps are included: S1, according to the vehicle layout, obtain the vehicle width ZW and define the unloaded ground line (1); S2, based on the vehicle layout and suspension jump, create the tire (5) envelope section A1; S3, based on the vehicle layout, defines the minimum ground clearance H1 of the wheel arch, the safety clearance H2 between the wheel arch and the tire (5), and the size W2 of the wheel arch covering the tire (5); S4, build wheel eyebrow shape; S5, fender structure design.

2. The method for constructing the boundary of a vehicle fender according to claim 1, characterized in that: The S4 comprises the following steps, 4.1 Based on the parameters determined in steps S1, S2 and S3, construct a preliminary shape of the fender; 4.2 Check the compliance of the preliminary fender shape constructed in step 4.1; 4.3 Analyze the installation convenience of wheel arches.

3. The method for constructing the boundary of a vehicle fender according to claim 2, characterized in that: Step 4.2 includes, 4.21 The outer edge of the wheel arch is located on the outer side of the tire (5) within the cross-sectional angle range; 4.22 The rear edge of the fender should be above the plane where the wheel center is located and below the horizontal plane 150mm above the wheel center; 4.23 The intersection points G1 and G2 of the edge of the fender and the horizontal plane 150 mm above the center of the wheel are located outside the longitudinal middle plane of the tire (5); 4.24 The depth p1 of the outer edge of the fender should not be less than 30 mm when measured in a transverse vertical plane passing through the center of the wheel; 4.25 The distance between the lower edge of the fender and the center of the wheel is c1≤2r, where r is the static radius of the wheel.

4. The method for constructing the boundary of a vehicle fender according to claim 3, characterized in that: The cross-sectional angle includes an area formed by two radial planes at 30° forward and 50° rearward of the wheel center.

5. The method for constructing the boundary of a vehicle fender according to claim 3, characterized in that: In the area formed by the two radial planes 30° forward and 50° backward of the wheel center, the depth of the outer edge of the wheel arch gradually decreases to zero from the center to both sides.

6. The method for constructing the boundary of a vehicle fender according to claim 2, characterized in that: Specifically, the above 4.3 is that, in the whole vehicle coordinates, the fender assembly direction is defined as the horizontal direction, and the angle between the fender outer profile (411) and the assembly direction is θ2, then the angle between the fender outer profile (411) and the vehicle body surface (7) in the whole vehicle coordinates is θ1=90°-θ2; If θ1 ≥ 80°, the structural design can be performed; If 70°≤θ1≤80°, simulate the installation feasibility; If θ1≤70°, repeat steps 4.1-4.

3.

7. The method for constructing the boundary of a vehicle fender according to claim 1, characterized in that: The S5 comprises the following steps: 5.1 Based on the fender shape determined in step S5, a preliminary fender vertical section structure is created; 5.2 Design a buckle seat (42) on the fender body (41) obtained in step 5.1, and determine the main positioning, spoke positioning and mounting holes; 5.3 Select the specifications of the buckle (8); 5.4 Move along the wheel arch assembly direction Y1 toward the outside of the vehicle body by a stroke W3, the angle between the center point connecting the two positions of the buckle (8) and the buckle axis (83) is θ3, then the installation offset of the buckle (8) in the Z direction Δx = tanθ3 × W3; 5.5 Calculate the installation offset Δx of the radial positioning and mounting holes according to the formula provided in step 5.4; If Δx≤L2, it is considered to meet the structural design requirements; If L2<Δx≤L2+0.2mm, the sample needs to be tested and verified before release; If Δx>L2+0.2mm, the structure needs to be optimized and steps 5.2-5.5 need to be repeated.

8. The method for constructing the boundary of a vehicle fender according to claim 7, characterized in that: When creating the preliminary fender vertical section structure, the DTS between the fender and the vehicle body surface (7) is ≤ 0~(-0.5) mm.

9. The method for constructing the boundary of a vehicle fender according to claim 7, characterized in that: When creating a preliminary wheel arch vertical section structure, the thickness of the wheel arch body (41) is determined to be T based on the wheel arch shape, molding process and material properties.

10. The method for constructing the boundary of a vehicle fender according to claim 7, characterized in that: When designing the buckle seat (42), the distance L1 between the buckle seat (42) and the edge of the wheel arch is ≤30 mm.

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