Automobile variable L113 size design method and automobile

Abstract

The invention relates to an automobile variable L113 size design method and an automobile, and the method comprises the following steps: Z-direction size adjustment: relative to an initial automobile model design scheme, a wheel center is vertically adjusted by a first set value; adjusting the size in the X direction; relative to the initial vehicle model design scheme, the installation position of the auxiliary frame on the longitudinal beam of the vehicle body moves forwards by a second set value, a new through hole is reserved in the front baffle so that after the auxiliary frame moves forwards, a steering engine intermediate shaft can penetrate through the new through hole, and the fixing position of the damping tower and the vehicle body moves forwards by a second set value; by means of the design method, the design of various L113-size vehicle models is achieved through the same platform, and the design amount and the research and development cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile design, and in particular to a method for designing automobile variable L113 dimensions and an automobile. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The size of the interior space of a car cabin is mainly affected by the overall design of the vehicle, the interior layout and some specific design decisions, which directly affect the riding experience and comfort of passengers. The design of the car and the layout of the cabin space are determined by many factors, including but not limited to the installation requirements of mechanical components, the vehicle's passability, the riding comfort of passengers, etc. These factors need to be comprehensively considered during the vehicle design process to achieve the best performance and user experience.

[0004] At present, all car companies are working on platformization and modularization. How to make more differentiated products with minimal investment and modification is a problem that every car company needs to think about and face. If the L113 value can be changed, the spatial dimensions of the car in the length direction can be changed to meet the differentiated needs of different car categories.

[0005] The L113 dimension refers to the horizontal distance from the front wheel center to the BOF point, which is the starting point of the X-direction of the passenger arrangement and the dividing line between the cabin and the passenger compartment. The BOF point refers to a point on the driver's sole surface when the driver's foot touches the accelerator pedal. Its lateral position is located at the center line of the sole, 203mm away from the heel point. The X direction is the length direction of the car, the width direction of the car is the Y direction, and the vertical direction is the Z direction.

[0006] L113 is one of the first dimensions defined by the platform. It is the core hard point of the platform and is the result of the balance between the shape proportion, collision safety, and human-machine performance. L113 directly includes the parts such as the powertrain and accessories, brake booster, front fender and pedal group and their horizontal distances required for collision safety.

[0007] L113 also needs to meet the necessary design space for the front wheel sports envelope and the A-pillar vertical plate. Generally speaking, the L113 of small cars and MPVs that focus on space is relatively small, while the L113 of large cars and sports cars that focus on styling effects is relatively large.

[0008] When designing using the current platform, if the size of L113 is changed, it is necessary to change the size and other parameters of all platform parts of the vehicle structure, such as the subframe and lower body. This will result in a large amount of design work and a significant increase in R&D costs. Summary of the invention

[0009] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for designing an automobile to change its L113 size and an automobile, which can achieve the purpose of changing the L113 size by changing some small parts while keeping the large platform parts such as the lower body and chassis unchanged.

[0010] In order to achieve the above object, the present invention is implemented through the following technical solutions:

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

[0012] Z-direction dimension adjustment: relative to the initial vehicle design, the wheel center is adjusted vertically downward by a first set value;

[0013] X-direction 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 intermediate shaft of the steering gear can pass through the new through hole after the subframe is moved forward, and the fixing position of the shock tower and the vehicle body is moved forward by a second set value;

[0014] Adjust the Y-axis dimension and adjust the wheelbase to meet the design requirements.

[0015] Optionally, the first set value is the gap distance value between the crossbeam and the wheel hub, and between the wheel hub and the bottom end of the A-pillar reserved in the initial vehicle design.

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

[0017] Optionally, the wheel center can be adjusted downward in the vertical direction by swinging the lower swing arm.

[0018] Optionally, relative to the initial vehicle model, the mounting hole on the vehicle body longitudinal beam for fixing the subframe is moved forward by a second set distance toward the front of the vehicle so that the mounting position of the subframe on the vehicle body longitudinal beam is moved forward by the second set distance.

[0019] Optionally, the diameter of the via hole on the front fender under the initial vehicle design is enlarged to form a new via hole.

[0020] Optionally, the wheelbase can be adjusted to meet the design requirements by changing the wheel rim offset.

[0021] Optionally, when relative to the initial vehicle model design, the tire radius after the tire radius increases by the first set value is the lower limit value of the radius, and its corresponding wheelbase is the first wheelbase, and the tire radius after the tire radius increases by the upper limit value is the upper limit value of the radius, and the corresponding wheelbase is the second wheelbase. If the increased tire radius value is not greater than the first set value, the designed wheelbase is the first wheelbase. If the increased tire radius value is the upper limit value, the designed wheelbase is the second wheelbase. If the increased tire radius value is greater than the first set value and not greater than the upper limit value, the wheelbase is the third wheelbase, and the third wheelbase is greater than the first wheelbase and smaller than the second wheelbase.

[0022] Optionally, during X-direction adjustment, the dynamic assembly and accessories move forward with the subframe by a second set distance.

[0023] In a second aspect, an embodiment of the present invention provides a car designed using the car variable L113 size design method described in the first aspect.

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

[0025] The design method of the present invention can realize the change design of tire and L113 size by lowering the wheel center, moving the subframe forward toward the front of the vehicle, and adjusting the wheelbase. A variety of models with L113 and tire sizes can be designed for the same platform. The purpose of changing the L113 size can be achieved by changing some small parts while the large platform parts such as the lower body and chassis remain unchanged, which greatly improves the design efficiency, reduces the design workload, and further reduces the R&D cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 is a flow chart of the method of embodiment 1 of the present invention;

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

[0029] Figure 3 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 is a schematic diagram of mounting points on a subframe of Embodiment 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of the powertrain and accessories moving forward with the sub-frame in Embodiment 1 of the present invention;

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

[0033] Figure 7 This is a schematic diagram of adjusting the shock tower in Example 1 of the present invention;

[0034] Figure 8 This is a schematic diagram of wheelbase adjustment in Embodiment 1 of the present invention; DETAILED DESCRIPTION

[0035] Example 1

[0036] This embodiment provides a method for designing the size of a vehicle variable L113. Figure 1 As shown, it includes Z-direction size adjustment, X-direction size adjustment and Y-direction size adjustment.

[0037] The Z-direction size adjustment, X-direction size adjustment, and Y-direction size adjustment in this embodiment are all adjusted based on the initial vehicle design. In the initial vehicle design, a gap of a first set value is reserved between the vehicle body cross beam and the wheel hub, and a gap of a first set value is reserved from the wheel hub to the bottom of the A-pillar, so that the tire size can be changed without changing the subframe and the lower body.

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

[0039] like Figure 2 As shown, the specific solution for Z-direction dimension adjustment is: lowering the wheel center position by a first set value. In this embodiment, the wheel center position is lowered by the swing of the lower control arm. By swinging the lower control arm, the wheel center position is lowered by 20 mm, and the suspension hard points, lower vehicle body and chassis remain unchanged.

[0040] The specific solution for adjusting the size in the X direction is:

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

[0042] In this embodiment, the upper limit of the increase in wheel radius is 40 mm, so the subframe and the suspension are moved forward 20 mm along 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 20 mm toward the front of the vehicle relative to the initial vehicle design. The subframe and corresponding accessories remain unchanged as a whole and are uniformly moved forward 20 mm toward the front of the vehicle along the X direction.

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

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

[0046] like Figure 5 As shown, the dynamic assembly and accessories on the subframe are moved forward 20 mm toward the front of the vehicle as a whole 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 after the subframe is moved forward by 20 mm, the steering gear intermediate shaft can pass through the front baffle through the new through hole.

[0048] Compared with the initial vehicle design, this embodiment forms a new through hole by increasing the through hole diameter. The diameter of the new through hole enables the steering gear intermediate shaft to pass through the front fender through the new through hole after the subframe moves forward 20 mm.

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

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

[0051] Y-axis size adjustment solution:

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

[0053] When the radius increase value of the tire reaches the upper limit value, that is, 40 mm, the wheelbase is adjusted to the second wheelbase by adjusting the rim offset. Preferably, the second wheelbase is 1695 mm.

[0054] When the tire radius increase value is between 20mm and 40mm, the wheelbase is adjusted to the third wheelbase by the rim offset distance. The third wheelbase is a set wheelbase between 1660mm and 1695mm. The set wheelbase can be determined according to the car shape and will not be described in detail here.

[0055] By adopting the design method of this embodiment, a variety of L113 and tire size models can be designed for the same platform. While the large platform parts such as the lower body and chassis remain unchanged, the purpose of changing the L113 size can be achieved by changing some small parts, which greatly improves the design efficiency, reduces the design workload, and further reduces the R&D cost.

[0056] Example 2

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

[0058] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for designing the L113 size of an automobile, characterized in that: The following steps are involved: Z-direction dimension adjustment: relative to the initial vehicle design, the wheel center is adjusted vertically downward by a first set value; X-axis size adjustment; Compared with the initial vehicle design, the installation 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 intermediate shaft of the steering gear can pass through the new through hole after the subframe is moved forward, and the fixing position of the shock tower and the vehicle body is moved forward by a second set value; Adjust the Y-axis dimension and adjust the wheelbase to meet the design requirements.

2. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: The first set value is the gap distance between the crossbeam and the wheel hub, and between the wheel hub and the bottom of the A-pillar reserved in the initial vehicle design.

3. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: The second set value is the difference between the upper limit of the increase in the tire radius relative to the initial vehicle model and the first set value.

4. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: The wheel center is adjusted downward in the vertical direction by swinging the lower swing arm.

5. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: Compared with the initial vehicle model, the mounting hole on the vehicle body longitudinal beam for fixing the subframe is moved forward by a second set distance toward the front direction of the vehicle so that the mounting position of the subframe on the vehicle body longitudinal beam is moved forward by the second set distance.

6. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: The diameter of the via on the front fender in the initial vehicle design was enlarged to form the new via.

7. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: The wheelbase can be adjusted to meet the design requirements by changing the wheel rim offset.

8. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: When compared with the initial vehicle model design, the tire radius after the tire radius increases by the first set value is the lower limit value of the radius, and its corresponding wheelbase is the first wheelbase; the tire radius after the tire radius increases by the upper limit value is the upper limit value of the radius, and its corresponding wheelbase is the second wheelbase; if the tire radius increase value is not greater than the first set value, the designed wheelbase is the first wheelbase; if the tire radius increase value is the upper limit value, the designed wheelbase is the second wheelbase; if the tire radius increase value is greater than the first set value and not greater than the upper limit value, the wheelbase is the third wheelbase, and the third wheelbase is greater than the first wheelbase and smaller than the second wheelbase.

9. A method for designing the size of a vehicle variable L113 as claimed in claim 1, characterized in that: During X-axis adjustment, the dynamic assembly and accessories move forward with the subframe by the second set distance.

10. An automobile, characterized in that: The vehicle variable L113 size design method is adopted according to any one of claims 1 to 9.

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