Arrangement design method of steering shield

Abstract

The invention relates to the technical field of vehicle interior trim system manufacturing, in particular to an arrangement design method of a steering shield, which comprises the following steps: inputting arrangement data of peripheral platform parts into modeling software, and then performing CAS surface manufacturing; dTS requirements on the periphery of the steering shield are input into modeling software, and a CAS surface is manufactured; arranging and checking peripheral boundary data; dTS data and CAS surface making data input in the early stage are rechecked; checking whether leakage gaps between the shield and the periphery are serious or not; a trimming CAS surface is manufactured; dividing the upper and lower shields into blocks; carrying out draft analysis; and sewing the main bodies of the upper and lower shields to form a closed entity, and the like. According to the method, a set of rigorous and comprehensive arrangement check design method is adopted, the method plays a great role in helping and guiding engineers for primary design of the steering shield, and also plays a role in systematically and comprehensively assisting experienced engineers and plays a role in systematically guiding design of the steering shield; according to the step execution of the method, repetition and various problems in the design process can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle interior system manufacturing, and in particular to a layout design method of a steering shield. Background Art

[0002] Steering guards are a key decorative component on modern vehicles. Their design is relatively complex, and they often face numerous issues after production. Without a thorough and comprehensive design review in the early stages, various issues often arise later, leading to costly corrections. However, there is currently no clear or systematic design methodology for steering guard layouts on the market. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: In order to overcome the above technical problems, the present invention provides a layout design method for a steering shield.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a method for designing the layout of a steering shield, comprising the following steps:

[0005] Step 1: Input the layout data of the peripheral platform parts associated with the steering shield into the modeling software and then produce the CAS surface (Computer-Aided Styling Surface);

[0006] Step 2: Input the DTS (Design Tolerance Specification) requirements around the steering shield into the modeling software and produce the CAS surface;

[0007] Step 3: After receiving the CAS surface production data, perform boundary data layout verification around the steering shield;

[0008] Step 4: Review the DTS data and CAS surface production data input in the early stage to see if they meet the design requirements;

[0009] Step 5: Check whether the gap between the steering shield and the surrounding areas is serious;

[0010] Step 6: Modify the CAS surface according to the feedback from steps 3-5;

[0011] Step 7: Based on the new CAS surface data trimmed in step 6, divide the steering shield into upper and lower shield blocks;

[0012] Step 8: Perform draft analysis on the CAS surfaces of the upper and lower shields respectively. If the feedback is not satisfied, modify the CAS surface.

[0013] Step 9: Sew the upper and lower shield bodies together to form a closed entity;

[0014] Among them, steps 1 and 2 have no order of precedence, and steps 3, 4, and 5 have no order of precedence.

[0015] The peripheral platform member associated with the steering shroud includes a steering shaft, a steering wheel skeleton, and / or a combination switch.

[0016] In step 3, the layout check of the boundary data around the steering shroud includes: the distance between the upper surface of the steering shroud and the lower part of the steering wheel, the distance between the steering shroud and the steering shaft, the distance between the steering shroud and the combination switch, the clearance between the steering shroud and the ball head of the combination switch, and the kinematic envelope clearance between the steering shroud and the adjustment handle.

[0017] The steering shroud supports four-way adjustment, including forward and backward telescopic movement along the axis of the steering column and up and down swinging in the vertical direction;

[0018] In step 2, within the maximum kinematic envelope of the steering shroud, the DTS requirement for the four sides of the steering shroud and the peripheral platform member is ≥6 mm. The four sides of the steering shroud include the left, right, upper, lower, and axial ends;

[0019] In step 3, the requirements for the layout check of the boundary data around the steering shroud are:

[0020] a) The minimum distance between the upper surface of the steering shroud and the lower part of the steering wheel ≥5 mm;

[0021] b) The minimum distance between the steering shroud and the steering shaft ≥10 mm;

[0022] c) The minimum distance between the steering shroud and the combination switch ≥5 mm;

[0023] d) The clearance between the steering shroud and the ball head of the combination switch: 1. If the rotating part of the ball head of the combination switch is directly matched with the steering shroud, then the minimum clearance requirement between the steering shroud and the ball head of the combination switch ≥0.5 mm; 2. If the rotating part of the ball head of the combination switch is assembled with its own fixing part and then cooperates with the steering shroud, then the minimum clearance requirement between the steering shroud and the ball head of the combination switch ≥1.5 mm;

[0024] e) The minimum kinematic envelope clearance between the steering shroud and the adjustment handle ≥5 mm.

[0025] 5. The layout design method of the steering shroud according to claim 1, characterized in that in step 7, the requirements for dividing the upper and lower shrouds of the steering shroud are:

[0026] a) The split seam is simple, gentle, and cannot turn sharply;

[0027] b) The split seam bisects the circle in the middle at the part of the ball head of the combination switch;

[0028] c) The large surface above and below the parting line is normally drafted, where the draft angle of at least 80% of the large surface is required to be ≥7°; the draft angle of the local position close to the parting line is allowed to be ≥3°.

[0029] In step 8, the CAS surface of the upper and lower shields is matched with the combination switch ball head to allow the slider to move, and the undercut amount required by the mold process is allowed to be met.

[0030] After step 9, the following steps are also included:

[0031] Step 10: External installation structure layout;

[0032] Step 11: Arrange the internal structure of the upper and lower shields;

[0033] Step 12: Perform draft analysis on the upper and lower shields, adjust the installation structure layout, and give priority to demolding;

[0034] Step 13: Perform mold flow analysis and make changes based on the analysis feedback.

[0035] Finally, include step 14: Freeze the data.

[0036] In step 10, the external mounting structure arrangement includes: all fixing points are arranged on the lower shield as much as possible.

[0037] In step 11, the internal structure of the upper and lower shields is arranged. The upper and lower shields mainly use a mutually locking structure, and undercut structures are arranged at corners where such arrangement is not possible. The principle of internal structure arrangement is to place mutually locking structures in the attachments in areas with large corner changes to control the matching gap.

[0038] The beneficial effect of the present invention is that the layout design method of the steering guard of the present invention adopts a rigorous and comprehensive layout verification design method, which not only provides great help and guidance for engineers who are designing the steering guard for the first time, but also plays a systematic and comprehensive auxiliary role for experienced engineers, and plays a systematic guiding role in the design of the steering guard; the present invention is concise and comprehensive, and is executed step by step according to the design steps, which can avoid repetitions and various problems in the design process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings and examples.

[0040] Figure 1 It is a schematic diagram of the relationship between the steering shield and its associated surrounding platform parts.

[0041] Figure 2 It is a structural diagram of the steering guard.

[0042] Figure 3 It is a structural diagram of the lower guard of the steering guard.

[0043] Figure 4 It is a schematic structural view of the upper shield of the steering shield.

[0044] Figure 5 It is a schematic structural view of another perspective of the steering shield.

[0045] Figure 6 It is Figure 5 the sectional view taken along line A-A in

[0046] Figure 7 It is Figure 5 the sectional view taken along line B-B in

[0047] In the figure, 1 is the upper shield, 2 is the lower shield, and 3 is the interlocking structure. Specific implementation mode

[0048] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0049] A layout design method for a steering shield of the present invention includes the following steps:

[0050] Step 1: Input the layout data of the peripheral platform parts associated with the steering shield into the modeling software and then perform CAS surface production; the peripheral platform parts associated with the steering shield include the steering shaft, the steering wheel skeleton, and / or the combination switch. Arrange the design positions of these associated peripheral platform parts on the vehicle according to the human-machine posture and input them into the modeling software, and then it can be checked Figure 1 and viewed. The main peripheral platform parts associated with the steering shield include the combination switch, the steering system, the steering wheel, and the movement envelope of the steering wheel. These need to be arranged by the general layout system according to the human-machine sitting posture in advance, including the adjustment envelope of the steering, and all are input into the modeling software. Based on these correct inputs, the modeling software can consider the matching platform parts suitable for this vehicle type and the space required for its movement during the CAS design, avoiding problems being fed back during engineering manufacturing after the CAS output, and then needing to be input into the modeling software again and modified repeatedly in this way.

[0051] Step 2: Input the DTS requirements around the steering shield into the modeling software and perform CAS surface production; inputting the DTS requirements around the steering shield in advance can ensure the repetition between the subsequent engineering and the modeling design, and can make early judgments and modify and optimize the modeling during the early design stage.

[0052] Step 3: After receiving the data for CAS surface production, conduct a check on the layout of the boundary data around the steering shield. This step is very important. During the styling design, some engineers may not pay enough attention to the platform components input in the early stage in order to pursue an extreme appearance, and may lower the requirements for some layouts. At this time, in Step 3, professional engineers should check these data immediately to avoid problems during the later-stage check, which would waste a lot of manpower and time for remedies. Since the peripheral data of these platform components of the steering shield is fixed and cannot be changed arbitrarily, if the problems are not identified in time, no matter which step the data has reached, it may be necessary to start over and retreat to Step 1 or Step 2, which has a huge impact. If the comprehensive check of the peripheral data is not carried out in advance and problems are found during the later data design, the wasted manpower and time will be relatively large.

[0053] Step 4: Recheck whether the previously input DTS data and the CAS surface production data meet the design requirements. If these data are not checked in the CAS stage first, a large amount of repeated work may be added later.

[0054] Step 5: Check whether the leakage gap between the steering shield and the surrounding areas is serious; in Step 5, if the leakage gap between the steering shield and the surrounding areas is serious, increase the shielding leather and / or flanging to block the gap. Many professionals do not pay attention to this step, but with the increasing requirements for refinement in the current automotive industry, if this gap is identified in advance, it can reduce the later repetitions. Moreover, the phenomenon of leakage gap in the steering shield often occurs. It is relatively easy to check whether there is a leakage gap in the design state, but when the steering is adjusted up and down, it is easy to overlook the check of whether there is a leakage gap. If it is only discovered when installing the sample car, the loss of manpower, financial resources, and time for rectification will be huge.

[0055] Step 6: Trim the CAS surface production according to the feedback from Steps 3 - 5;

[0056] Step 7: Based on the new CAS surface data trimmed in Step 6, perform the block division of the upper and lower shields of the steering shield. The block division of the upper and lower shields is also an essential step for the later data design. The quality of the block division involves the feasibility of data production. Without this step, it is very difficult to conduct further analysis of the upper and lower shields.

[0057] Step 8: Conduct draft analysis on the CAS surfaces of the upper and lower shields respectively. If the feedback is not satisfied, modify the CAS surface. This step of draft analysis is an important step in the early stage of 3D data design. Correct draft analysis is crucial for the design of the steering shield, which will affect whether it can be demolded normally and subsequent production and manufacturing.

[0058] Step 9: Stitch the main bodies of the upper and lower shields to form a closed solid.

[0059] Among them, steps 1 and 2 have no sequence priority, and steps 3, 4, and 5 have no sequence priority either.

[0060] In step 3, the boundary data layout check around the steering shroud includes: the distance between the upper surface of the steering shroud and the lower part of the steering wheel, the distance between the steering shroud and the steering shaft, the distance between the steering shroud and the combination switch, the clearance between the steering shroud and the ball head of the combination switch, and the movement envelope clearance between the steering shroud and the adjustment handle.

[0061] The steering shroud supports four-way adjustment, including forward and backward telescopic movement along the axis of the steering column and up and down swinging in the vertical direction;

[0062] In step 2, within the maximum movement envelope of the steering shroud, the DTS requirement for the four sides of the steering shroud and the surrounding platform parts is ≥6 mm. The four sides of the steering shroud include the left, right, upper, lower, and axial ends;

[0063] In step 3, the requirements for the boundary data layout check around the steering shroud are as follows:

[0064] a) The minimum distance between the upper surface of the steering shroud and the lower part of the steering wheel ≥5 mm;

[0065] b) The minimum distance between the steering shroud and the steering shaft ≥10 mm;

[0066] c) The minimum distance between the steering shroud and the combination switch ≥5 mm;

[0067] d) The clearance between the steering shroud and the ball head of the combination switch: 1. If the rotating part of the ball head of the combination switch is directly matched with the steering shroud, then the minimum clearance requirement between the steering shroud and the ball head of the combination switch ≥0.5 mm; 2. If the rotating part of the ball head of the combination switch is assembled with its own fixing part and then cooperates with the steering shroud, then the minimum clearance requirement between the steering shroud and the ball head of the combination switch ≥1.5 mm;

[0068] e) The minimum movement envelope clearance between the steering shroud and the adjustment handle ≥5 mm.

[0069] In step 7, the requirements for the upper and lower shroud blocks of the steering shroud are as follows:

[0070] a) The split seam is simple, smooth, and cannot turn sharply;

[0071] b) The split seam bisects the circle in half at the part of the ball head of the combination switch;

[0072] c) The large surfaces of the upper and lower halves of the split seam are normally draft-molded, and it is required that the draft angle of at least 80% of the large surface ≥7°; the draft angle at the position near the split seam is allowed to be ≥3°.

[0073] In Step 8, the slider is allowed to move at the matching position of the CAS surface of the upper and lower shields and the ball head of the combination switch, and the undercut amount that meets the mold process is allowed. This is a characteristic unique to general steering shields. Undercuts are inevitable in some local areas and require the use of sliders, mainly due to the characteristics caused by the matching of the combination switch.

[0074] After Step 9, the following steps are further included:

[0075] Step 10: External installation structure layout: The external installation structure of the steering shield is different from other products. Due to the inherent structure of the steering column itself, the available installation area is relatively small. All external structure layouts must start when the main body is completed, and first optimize to meet the overall fixation and stability of the steering shield.

[0076] Step 11: Layout of the internal structure of the upper and lower shields themselves;

[0077] Step 12: Conduct draft analysis on the upper and lower shields, adjust the installation structure layout, and give priority to meeting mold release: Although draft analysis of CAS has been carried out in the early stage, due to the addition of internal and external installation structures in the later stage, there will still be a phenomenon that the mold cannot be released locally. This step of verification is carried out after the preliminary data design is completed, otherwise it will lead to undercut problems in mold processing, the mold cannot be released, and production and manufacturing cannot be carried out.

[0078] Step 13: Conduct mold flow analysis and make changes according to the results of the analysis feedback: The structure of the steering shield is complex, and there are production defects such as easy deformation. If this step is not carried out, injection molding defects such as product deformation may occur in the later stage, and the mold will be scrapped.

[0079] Finally, Step 14 is included: Freeze the data.

[0080] In Step 10, the external installation structure layout includes: Two screws are fixed on the combination switch at the upper part, and one is fixed on the steering shaft bracket at the lower part. These three fixing points should be arranged on the lower shield as much as possible. Otherwise, the gap between the upper and lower shields will be seriously affected by the accuracy of the mating parts at the three fixing points, and it will be difficult to control the matching of the later products.

[0081] In Step 11, the layout of the internal structure of the upper and lower shields themselves includes: The upper and lower shields mainly adopt an interlocking structure, and preferably adopt the interlocking structures as shown in Figure 3 and Figure 4 . The cross-section of the interlocking structure can be referred to Figure 6 and Figure 7 . An undercut structure is arranged at the corner positions where it is impossible to arrange. The principle followed by the layout of the self-structure is that an interlocking structure must be arranged in the area with large corner changes to control the matching gap.

[0082] Since the die structure of the steering shield is relatively complex, following the steps of the layout design method of the present invention step by step will not miss certain key elements in the design process. The 14 steps of the present invention already cover all the key elements of the structural data of the steering shield, including demolding, external matching, internal matching, block division, installation, movement, and mold flow.

[0083] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A layout design method for a steering shield, characterized in that, It includes the following steps: Step 1: Input the layout data of the peripheral platform parts associated with the steering shroud into the modeling software and then create the CAS surface; Step 2: Input the DTS requirements around the steering shroud into the modeling software and create the CAS surface; Step 3: After receiving the CAS surface creation data, check and verify the layout of the boundary data around the steering shroud; Step 4: Recheck whether the previously input DTS data and CAS surface creation data meet the design requirements; Step 5: Check whether the leakage gap between the steering shroud and the surrounding is serious; Step 6: Modify the CAS surface creation based on the feedback from Steps 3 - 5; Step 7: Based on the new CAS surface data modified in Step 6, divide the upper and lower shrouds of the steering shroud; Step 8: Conduct draft analysis on the CAS surfaces of the upper and lower shrouds respectively. If it does not meet the feedback, modify the CAS surface; Step 9: Stitch the main bodies of the upper and lower shrouds to form a closed solid; Among them, Step 1 and Step 2 have no sequence, and Step 3, Step 4 and Step 5 have no sequence.

2. The layout design method of the steering guard as claimed in claim 1, wherein, The peripheral platform parts associated with the steering shroud include a steering shaft, a steering wheel skeleton and / or a combination switch.

3. The layout design method of the steering guard as described in claim 1, characterized in that, In Step 3, the check and verification of the layout of the boundary data around the steering shroud include: the distance between the upper surface of the steering shroud and the lower part of the steering wheel, the distance between the steering shroud and the steering shaft, the distance between the steering shroud and the combination switch, the clearance between the steering shroud and the ball head of the combination switch, and the movement envelope clearance between the steering shroud and the adjusting handle.

4. The layout design method of the steering guard as claimed in claim 2, characterized in that, The steering shroud supports four-way adjustment, including the front-back telescopic movement along the axis of the steering column and the up-down swing in the vertical direction; In Step 2, within the maximum movement envelope range of the steering shroud, the DTS requirements between the steering shroud and the peripheral platform parts around it are ≥6mm. The four sides of the steering shroud include left, right, upper, lower and both axial ends; In Step 3, the requirements for the check and verification of the layout of the boundary data around the steering shroud are: a) The minimum distance between the upper surface of the steering shroud and the lower part of the steering wheel ≥5mm; b) The minimum distance between the steering shroud and the steering shaft ≥10mm; c) The minimum distance between the steering shroud and the combination switch ≥5mm; d) The clearance between the steering shroud and the ball head of the combination switch:

1. If the rotating part of the ball head of the combination switch directly matches the steering shroud, then the minimum clearance requirement between the steering shroud and the ball head of the combination switch is ≥0.5mm; 2. If the rotating part of the ball head of the combination switch is assembled with its own fixing part and then cooperates with the steering shroud, then the minimum clearance requirement between the steering shroud and the ball head of the combination switch is ≥1.5mm; e) The minimum movement envelope clearance between the steering shroud and the adjusting handle ≥5mm.

5. The layout design method of the steering guard as claimed in claim 1, characterized in that, In Step 7, the requirements for dividing the upper and lower shrouds of the steering shroud are: a) The parting line is simple, gentle and cannot turn sharply; b) The parting line bisects the circle in half at the part of the ball head of the combination switch; c) The large surfaces of the upper and lower halves of the parting line are normally drafted, and it is required that the draft angle of at least 80% of the large surface area is ≥7°; the draft angle at the position locally close to the parting line is allowed to be ≥3°.

6. The layout design method of the steering shield according to claim 1, characterized in that, In Step 8, a slide block is allowed at the matching position between the CAS surfaces of the upper and lower shrouds and the ball head of the combination switch, and the undercut amount that meets the die process is allowed.

7. The layout design method of the steering shield according to claim 1, characterized in that, After Step 9, it also includes the following steps: Step 10: Arrange the external installation structure; Step 11: Layout of the internal structure of the upper and lower shields; Step 12: Conduct draft analysis on the upper and lower shields, adjust the layout of the mounting structure, and prioritize mold release; Step 13: Conduct mold flow analysis and make changes based on the results of the analysis feedback.

8. The layout design method of the steering guard as claimed in claim 7, characterized in that, Finally, it includes Step 14: Freeze the data.

9. The layout design method of the steering guard as claimed in claim 7, characterized in that, In Step 10, the layout of the external mounting structure includes: arranging all fixed points on the lower shield as much as possible.

10. The layout design method of the steering shield according to claim 7, characterized in that, In Step 11, the layout of the internal structure of the upper and lower shields includes: the upper and lower shields mainly adopt an interlocking structure, and an undercut structure is arranged at the corner positions where it is impossible to arrange.

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