A method for designing the L113 dimensions of a car and the car

Abstract

This invention relates to a method for designing a variable L113 size automobile and an automobile thereof, comprising the following steps: Z-axis dimension adjustment: relative to the initial vehicle design, the wheel center is adjusted vertically downward by a first set value; X-axis dimension adjustment: relative to the initial vehicle design, the mounting position of the subframe on the longitudinal beam of the vehicle body is moved forward by a second set value, a new through hole is reserved on the front fender so that the steering gear intermediate shaft can pass through the new through hole after the subframe is moved forward, and the fixed position of the shock absorber tower and the vehicle body is moved forward by a second set value; Y-axis dimension adjustment: the wheelbase is adjusted to meet the design requirements. The design method of this invention utilizes the same platform to realize the design of multiple L113 size vehicles, reducing the design workload and R&D costs.

Description

Technical Field

[0001] This invention relates to the field of automotive design technology, specifically to a method for designing a variable L113 size automobile and an automobile thereof. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The size of a car's interior space is primarily influenced by the vehicle's overall design, interior layout, and specific design decisions. These design choices directly impact passenger comfort and experience. The design of a car and the layout of its cabin space are determined by a variety of factors, including but not limited to the installation requirements of mechanical components, vehicle maneuverability, and passenger comfort. All these factors must be comprehensively considered during the vehicle design process to achieve optimal performance and user experience.

[0004] Currently, all automakers are working on platformization and modularization. How to create more differentiated products with minimal investment and modifications is a problem that every automaker needs to consider and face. If the L113 value can be varied, it is possible to change the spatial dimensions of the car in the length direction, meeting the differentiated needs of different car categories.

[0005] The L113 dimension refers to the horizontal distance between the front wheel center and the BOF (Body of the Field) point. It is the starting point for the occupant arrangement in the X-axis and the boundary line between the engine compartment and the passenger compartment. The BOF point is a point on the sole of the driver's shoe when their foot contacts the accelerator pedal. Its lateral position is located at the center line of the sole, 203mm from the heel point. The X-axis is the length direction of the vehicle, the Y-axis is the width direction, and the Z-axis is the vertical direction.

[0006] L113 is one of the first dimensions defined for the platform and is a core hard point of the platform. It is the result of the balance and constraints between styling proportions, crash safety, and human-machine performance. L113 directly includes parts such as the powertrain and accessories, brake booster, front fender and pedal assembly, as well as the horizontal distance necessary for crash safety.

[0007] The L113 also needs to accommodate the necessary design space for the front wheel travel envelope and A-pillar vertical panels. Generally speaking, the L113 is smaller for small cars and MPVs that emphasize space, while it is larger for large cars and sports cars that emphasize styling.

[0008] When designing using the current platform, if the size of L113 is changed, the dimensions and parameters of all platform components, such as the subframe and lower body of the vehicle architecture, need to be changed, resulting in a large design workload and a significant increase in R&D costs. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the purpose of this invention is to provide a design method and vehicle for a variable L113 size, which achieves the variable L113 size by changing some small parts while keeping large platform components such as the lower body and chassis unchanged.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0011] In a first aspect, embodiments of the present invention provide a method for designing a variable L113 size for an automobile, comprising the following steps:

[0012] Z-axis dimension adjustment: Compared to the initial vehicle design, the wheel center is adjusted vertically downwards by the first set value;

[0013] X-axis dimension adjustment; relative to the initial vehicle design, the mounting position of the subframe on the longitudinal beam of the body is moved forward by a second set value, a new through hole is reserved on the front panel so that the steering gear intermediate shaft can pass through the new through hole after the subframe is moved forward, and the fixing position of the shock absorber tower and the body is moved forward by a second set value.

[0014] Adjust the Y-axis dimensions to meet the design requirements for wheelbase.

[0015] Optionally, the first setting value is the gap distance between the crossbeam and the wheel arch, and between the wheel arch and the bottom of the A-pillar, which is reserved in the initial vehicle design scheme.

[0016] Optionally, the second setting is the difference between the upper limit of the tire radius increase relative to the initial vehicle model and the first setting.

[0017] Optionally, the wheel center can be adjusted vertically by swinging the lower control arm.

[0018] Optionally, relative to the initial model, the mounting holes on the body longitudinal beams used for fixing the subframe are moved forward by a second predetermined distance toward the front of the vehicle to achieve a second predetermined distance forward movement of the subframe's mounting position on the body longitudinal beams.

[0019] Optionally, the diameter of the through hole on the front baffle under the initial vehicle design can be increased to form a new through hole.

[0020] Optionally, the wheel track can be made to meet the design requirements by changing the rim offset distance.

[0021] Optionally, relative to the initial vehicle design, the tire radius after increasing by a first set value is the lower limit of the radius, and the corresponding wheel track is the first wheel track; the tire radius after increasing by an upper value is the upper limit of the radius, and the corresponding wheel track is the second wheel track; if the increase in tire radius is not greater than the first set value, the designed wheel track is the first wheel track; if the increase in tire radius is the upper limit, the designed wheel track is the second wheel track; if the increase in tire radius is greater than the first set value but not greater than the upper limit, the wheel track is the third wheel track, which is greater than the first wheel track and less than the second wheel track.

[0022] Optionally, during X-axis adjustment, the powertrain and accessories move forward a second predetermined distance along with the subframe.

[0023] Secondly, embodiments of the present invention provide an automobile designed using the variable L113 size design method described in the first aspect.

[0024] The beneficial effects of this invention are as follows:

[0025] The design method of this invention only requires adjusting the wheel center, moving the subframe forward towards the front of the vehicle, and adjusting the track width to achieve the design of changing the tire and L113 size. It can design multiple models with different L113 and tire sizes for the same platform. While keeping the large platform components such as the lower body and chassis unchanged, the purpose of changing the L113 size can be achieved by changing some small parts, which greatly improves design efficiency, reduces design workload, and thus reduces R&D costs. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] Figure 1 This is a flowchart of the method in Embodiment 1 of the present invention;

[0028] Figure 2 The above is a schematic diagram of the Z-axis dimension adjustment in Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the forward movement of the mounting point on the longitudinal beam of the vehicle body in Embodiment 1 of the present invention;

[0030] Figure 4 This is a schematic diagram of the mounting points on the subframe in Embodiment 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of the powertrain and accessories moving forward with the subframe according to Embodiment 1 of the present invention;

[0032] Figure 6 This is a schematic diagram of the via adjustment in Embodiment 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of the shock absorber tower adjustment in Embodiment 1 of the present invention;

[0034] Figure 8 This is a schematic diagram of wheel track adjustment according to Embodiment 1 of the present invention; Detailed Implementation

[0035] Example 1

[0036] This embodiment provides a method for designing a variable L113 size for automobiles, such as... Figure 1 As shown, this includes Z-axis dimensional adjustment, X-axis dimensional adjustment, and Y-axis dimensional adjustment.

[0037] In this embodiment, the Z-axis, X-axis, and Y-axis dimensional adjustments are all based on the initial vehicle design. In the initial vehicle design, a first-set gap is reserved between the body crossbeam and the wheel arch, and a first-set gap is reserved between the wheel arch and the bottom of the A-pillar, so that the tire size can be changed without changing the subframe and lower body.

[0038] In this embodiment, the first set value is 20mm.

[0039] like Figure 2 As shown, the specific scheme for adjusting the Z-axis size is as follows: the wheel center position is lowered by a first set value. In this embodiment, the wheel center position is lowered by swinging the lower control arm. By swinging the lower control arm, the wheel center position is lowered by 20mm, while the suspension hard point, lower body and chassis remain unchanged.

[0040] The specific plan for adjusting the X-axis dimensions is as follows:

[0041] (1) As Figures 3-4 As shown, the subframe and suspension move forward along the X direction toward the front of the vehicle by a second set value. The second set value is the difference between the upper limit of the tire radius increase and the first set value.

[0042] In this embodiment, the maximum increase in wheel radius is 40mm, therefore the subframe and suspension are moved forward 20mm in the X direction toward the front of the vehicle.

[0043] In order to move the subframe and suspension forward, the mounting point of the subframe on the longitudinal beam of the vehicle body is moved forward by 20mm relative to the initial vehicle design. The subframe and its corresponding accessories remain unchanged and are uniformly moved forward by 20mm along the X direction towards the front of the vehicle.

[0044] In this embodiment, in the initial vehicle design, three subframe mounting points are provided on the longitudinal beam of the vehicle body, and the three subframe mounting points are simultaneously moved forward 20mm towards the front of the vehicle.

[0045] During processing, the moved installation point and the original installation point will not appear simultaneously.

[0046] like Figure 5 As shown, the powertrain and accessories on the subframe are moved forward 20mm towards the front of the vehicle along with the subframe.

[0047] (2) Figure 6 As shown, a new through hole is reserved on the front baffle of the steering gear intermediate shaft so that the steering gear intermediate shaft can pass through the front baffle through the new through hole after the subframe is moved forward by 20mm.

[0048] Compared to the initial vehicle design, this embodiment uses an increased diameter to create a new through hole. The new through hole's diameter allows the steering gear intermediate shaft to pass through the front baffle after the subframe is moved forward by 20mm.

[0049] (3) Figure 7 As shown, compared to the initial vehicle design, the welding position of the shock absorber tower and the longitudinal beam of the vehicle body is moved forward by 20mm along the X direction towards the front of the vehicle.

[0050] After adjusting the subframe and its corresponding accessories, the through hole of the steering gear intermediate shaft on the front baffle, and the shock absorber tower, the X-axis dimension adjustment was completed.

[0051] Y-axis dimension adjustment scheme:

[0052] like Figure 8 As shown, the Y-axis track width is adjusted by adjusting the rim offset distance. Compared with the initial vehicle design, when the tire radius increases by no more than 20mm, the track width is adjusted to the first track width by adjusting the rim offset distance. Preferably, the first track width is 1660mm.

[0053] When the tire radius increases to the upper limit of 40mm, the wheel track is adjusted to the second wheel track by adjusting the rim offset distance. Preferably, the second wheel track is 1695mm.

[0054] When the tire radius increase is between 20mm and 40mm, the wheel track is adjusted to the third wheel track by adjusting the rim offset. The third wheel track is the set wheel track between 1660mm and 1695mm. The set wheel track can be determined according to the car's shape, which will not be described in detail here.

[0055] Using the design method of this embodiment, multiple L113 and tire sizes can be designed for the same platform. While keeping large platform components such as the lower body and chassis unchanged, the L113 size can be changed by modifying some small parts, which greatly improves design efficiency, reduces design workload, and thus reduces R&D costs.

[0056] Example 2

[0057] This embodiment provides a car designed using the variable L113 size design method described in Embodiment 1.

[0058] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for designing the L113 size of an automobile, characterized in that, Includes the following steps: Z-axis dimension adjustment: Compared to the initial vehicle design, the wheel center is adjusted vertically downwards by the first set value; X-axis dimension adjustment; Compared to the initial vehicle design, the subframe's mounting position on the body longitudinal beam is moved forward by a second set value, a new through hole is reserved on the front panel so that the steering gear intermediate shaft can pass through the new through hole after the subframe is moved forward, and the shock absorber tower's fixing position to the body is moved forward by a second set value. Y-axis dimension adjustment to adjust the wheelbase to meet design requirements; The first set value is the gap distance between the crossbeam and the wheel arch, and between the wheel arch and the bottom of the A-pillar, which is reserved in the initial vehicle design scheme. The second setting is the difference between the upper limit of the tire radius increase relative to the initial vehicle model and the first setting.

2. The method for designing a variable L113 size automobile as described in claim 1, characterized in that, The wheel center is adjusted vertically by swinging the lower control arm.

3. The method for designing a variable L113 size automobile as described in claim 1, characterized in that, Compared to the initial model, the mounting holes on the longitudinal beams of the vehicle body for fixing the subframe are moved forward by a second predetermined distance toward the front of the vehicle, so that the mounting position of the subframe on the longitudinal beams of the vehicle body is moved forward by a second predetermined distance.

4. The method for designing a variable L113 size automobile as described in claim 1, characterized in that, The diameter of the through hole on the front baffle under the initial vehicle design was increased to form a new through hole.

5. The method for designing a variable L113 size automobile as described in claim 1, characterized in that, The wheel track can be made to meet design requirements by changing the rim offset distance.

6. The method for designing a variable L113 size automobile as described in claim 1, characterized in that, Compared to the initial vehicle design, the tire radius after increasing by a first set value is the lower limit of the radius, and the corresponding wheelbase is the first wheelbase. The tire radius after increasing by an upper limit value is the upper limit of the radius, and the corresponding wheelbase is the second wheelbase. If the increase in tire radius is not greater than the first set value, the designed wheelbase is the first wheelbase. If the increase in tire radius is the upper limit value, the designed wheelbase is the second wheelbase. If the increase in tire radius is greater than the first set value but not greater than the upper limit value, the wheelbase is the third wheelbase. The third wheelbase is greater than the first wheelbase and less than the second wheelbase.

7. The method for designing a variable L113 size automobile as described in claim 1, characterized in that, When adjusting in the X direction, the powertrain and accessories move forward a second predetermined distance along with the subframe.

8. A car, characterized in that, It is designed using the vehicle variable L113 size design method according to any one of claims 1-7.

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