Vehicle cabin lower protection plate and vehicle

Abstract

According to the lower protection plate of the vehicle cabin, the arc design with the high front portion and the low rear portion is adopted, fresh air entering from the grating of the front skin is gradually guided downwards along the arc face, the lower protection plate of the vehicle cabin better conforms to the characteristics of aerodynamics, and wind resistance can be effectively reduced. In arrangement, the front end of the vehicle cabin lower protection plate is in lap joint with the front skin of the vehicle, namely, the lower surface of the front end of the vehicle cabin lower protection plate is supported by the front skin, the rigidity of the front end of the vehicle cabin lower protection plate can be effectively improved, and deformation of the front end of the vehicle cabin lower protection plate is reduced. Structural optimization is carried out through the arrangement mode, so that the vehicle cabin lower protection plate has the advantages of being low in wind resistance coefficient, small in deformation and free of cracking failure. The utility model further provides a vehicle with the vehicle cabin lower protection plate.

Description

Technical Field

[0001] This utility model belongs to the technical field of vehicle engine compartment underbody protection plates, and specifically relates to a vehicle engine compartment underbody protection plate and a vehicle. Background Technology

[0002] For automobiles, especially range-extended hybrid electric vehicles (REEVs), combined fuel consumption and energy-to-electricity fuel consumption are important performance indicators and key factors for consumers when purchasing vehicles. According to data, air resistance in REEVs has a significant impact on energy consumption, accounting for approximately 25% to 40% of total energy consumption. The drag coefficient is a crucial factor affecting air resistance, and the underbody protection plate is an important component for reducing the drag coefficient.

[0003] Fresh air enters the engine compartment through the lower grille of the front skin. The airflow below is guided by the underbody shield, reducing the frontal drag on exposed chassis components such as the control arms and crossbeams. This also facilitates faster airflow under the vehicle, minimizing drag caused by the confined space. The underbody shield is installed below the engine compartment. During high-speed driving, it needs to withstand a certain amount of wind pressure, and when driving through water, it needs to withstand a certain amount of water pressure to ensure its vibration resistance meets requirements. Simultaneously, the underbody shield must have sufficient rigidity to prevent excessive deformation under load.

[0004] However, during testing of currently lightweight vehicles, it has been found that, for example... Figure 1 As shown, the existing engine compartment underbody protection plate S1 is a straight plate, bolted to the vehicle body via multiple front mounting points S110 and rear mounting points S120. The distance from the front end of the engine compartment underbody protection plate S1 to the front mounting point S110 is 104mm, and the front end of the engine compartment underbody protection plate S1 is located under the front skin without support, resulting in severe deformation of the front end of the engine compartment underbody protection plate, and cracking failure at the front mounting point of the vehicle body. The lowest point of the rear end of the engine compartment underbody protection plate S1 is 10mm higher than the lowest point of the swing arm crossbeam assembly vertically. This arrangement increases the wind resistance experienced by exposed chassis components, resulting in increased wind resistance.

[0005] Therefore, how to optimize the underbody protection plate of the vehicle engine compartment is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to provide a vehicle engine compartment underbody protection plate and vehicle, which, through structural optimization, has the characteristics of low drag coefficient, small deformation, and no cracking failure.

[0007] To solve the above-mentioned technical problems, this utility model provides a vehicle engine compartment lower guard plate, wherein the vehicle engine compartment lower guard plate is an arc plate, and the curvature of the arc plate gradually decreases from the front end to the rear end.

[0008] The front end of the vehicle's engine compartment underbody panel is designed to overlap with the vehicle's front skin.

[0009] Optionally, in the above-mentioned vehicle engine compartment underbody panel, the vehicle engine compartment underbody panel is a plastic panel.

[0010] Optionally, in the aforementioned vehicle engine compartment underbody protection panel, the rear end of the vehicle engine compartment underbody protection panel tends to be horizontal.

[0011] Optionally, in the aforementioned vehicle engine compartment underbody panel, the front and rear ends of the vehicle engine compartment underbody panel are respectively provided with a front mounting point and a rear mounting point for connecting with the vehicle body.

[0012] Optionally, in the above-mentioned vehicle engine compartment underbody panel, the vehicle engine compartment underbody panel has multiple intersecting ribs arranged radially outward around the front mounting point.

[0013] And / or, the vehicle engine compartment underbody panel has a raised rib on the outside of the front mounting point.

[0014] Optionally, in the aforementioned vehicle engine compartment underbody panel, the ribs are positioned outside the intersecting ribs at each front mounting point.

[0015] Optionally, in the aforementioned vehicle engine compartment lower guard plate, the front end of the vehicle engine compartment lower guard plate is provided with several longitudinal ribs.

[0016] Optionally, in the aforementioned vehicle engine compartment lower guard plate, the longitudinal rib is located near the center of the front end of the vehicle engine compartment lower guard plate.

[0017] Optionally, the vehicle engine compartment underbody panel described above may also be provided with several drainage outlets.

[0018] This utility model provides a vehicle, including the vehicle engine compartment underbody protection plate as described above.

[0019] This utility model provides a vehicle engine compartment underbody protection plate, which has the following advantages:

[0020] The vehicle's engine compartment underbody protection panel features a curved design that slopes downwards from the front to the rear. This design guides fresh air entering from the front skin's grille downwards along the curved surface, improving aerodynamics and effectively reducing wind resistance. In terms of layout, the front end of the underbody protection panel overlaps with the front skin, meaning the lower surface of the front end is supported by the front skin. This effectively increases the rigidity of the front end of the underbody protection panel and reduces deformation.

[0021] By optimizing the structure through the above-mentioned configuration, the vehicle's engine compartment underbody protection plate can achieve the characteristics of low drag coefficient, small deformation, and no cracking or failure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A front view of a vehicle engine compartment underbody protection panel provided by the prior art;

[0024] Figure 2 A front view of a vehicle engine compartment underbody panel provided in an embodiment of this utility model;

[0025] Figure 3 A schematic diagram of the structure of a vehicle engine compartment underbody panel provided in an embodiment of this utility model;

[0026] Figure 4 A structural schematic diagram of a vehicle engine compartment underbody protection plate provided for an embodiment of this utility model (structural rigidity at different locations);

[0027] Figure 5 Stress cloud diagram of the vehicle's engine compartment underbody protection plate at the front mounting point in the prior art;

[0028] Figure 6 Stress cloud diagram at the front mounting point of the vehicle engine compartment underbody panel provided in this embodiment of the utility model.

[0029] exist Figure 1 middle:

[0030] S1 - Vehicle engine compartment underbody protection plate;

[0031] S110 - Front mounting point; S120 - Rear mounting point;

[0032] exist Figures 2-4 middle:

[0033] S-Vehicle engine compartment underbody protection plate;

[0034] 110 - Front mounting point; 120 - Rear mounting point;

[0035] 210 - Longitudinal reinforcement; 220 - Cross reinforcement; 230 - Convex reinforcement;

[0036] 300 - Drain outlet. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] The core of this utility model is to provide a vehicle engine compartment underbody protection plate and vehicle, which, through structural optimization, has the characteristics of low drag coefficient, small deformation, and no cracking failure.

[0039] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] For details, please refer to Figures 1-6 This utility model provides a vehicle engine compartment underbody protection plate, wherein the vehicle engine compartment underbody protection plate S is an arc plate (also called an arc-shaped plate), and the curvature of the arc plate gradually decreases from the front end to the rear end. Its main function is to reduce the wind resistance coefficient, and at the same time, it serves to block mud, sand, and road surface water.

[0041] The front end of the vehicle's engine compartment underbody protection plate S is designed to overlap with the vehicle's front skin. To ensure the stability of the overlap, a certain length is left at the front and rear edges of the overlap surface of the vehicle's engine compartment underbody protection plate S. This length is as follows: Figure 2 As shown in Figure a, the specific value can be 20mm.

[0042] Compared to existing technologies, the vehicle engine compartment underbody protection plate provided in this solution adopts a rounded design with a higher front and lower rear, which guides the fresh air entering from the grille of the front skin gradually downward along the rounded surface, which is more in line with aerodynamic characteristics and can effectively reduce wind resistance.

[0043] In terms of arrangement, the front end of the vehicle's engine compartment underbody protection plate S overlaps with the front skin of the vehicle. That is, the lower surface of the front end of the vehicle's engine compartment underbody protection plate S is supported by the front skin, which can effectively improve the rigidity of the front end of the vehicle's engine compartment underbody protection plate S and reduce the deformation of the front end of the vehicle's engine compartment underbody protection plate S.

[0044] By optimizing the structure through the above-mentioned configuration, the vehicle's engine compartment underbody protection plate S has the characteristics of low drag coefficient, small deformation, and no cracking failure.

[0045] Considering the requirements of lightweighting, the vehicle's engine compartment underbody protection plate S is made of plastic, but it can also be made of resin. It has low manufacturing cost and light weight, and mainly serves to reduce the drag coefficient, while also protecting against mud, sand and water accumulation on the road.

[0046] Furthermore, plastic protective panels can be composed of polypropylene (PP) and EPDM (ethylene-propylene-diene copolymer), which have excellent elasticity and chemical resistance.

[0047] In a specific embodiment, the rear end of the vehicle engine compartment underbody protection plate S tends to be horizontal. Compared with the prior art, the rear end of the vehicle engine compartment underbody protection plate S is designed to be pulled down, with its lowest position being lower than the lowest position of the swing arm crossbeam assembly vertically, by about 10mm. This design reduces the wind resistance of exposed chassis components and accelerates the airflow velocity at the bottom, allowing it to quickly rise and wash upwards when it reaches the rear of the vehicle, which is beneficial for the rearward movement and balance of the rear vortex.

[0048] Table 1. Calculation of vehicle operating conditions for different engine compartment underbody protection schemes.

[0049] Cabin underbody protection scheme Speed Wind resistance Change in wind resistance drag coefficient Change in drag coefficient Existing solutions 135 km / h 655 N / 0.313 Cd / Invention Solution 135 km / h 632 N -23 N 0.302 Cd -0.011 Cd

[0050] Different engine compartment underbody protection schemes were used to calculate the vehicle's wind tunnel performance at 135 km / h. The calculation results are shown in Table 1. It can be seen that the proposed solution reduces the frontal drag by 23 N and the drag coefficient by 11 counts. Through the optimization of the engine compartment underbody protection structure, the overall vehicle drag coefficient is significantly reduced.

[0051] In a specific embodiment, the front and rear ends of the vehicle's engine compartment underbody panel S are respectively provided with a front mounting point 110 and a rear mounting point 120 for connecting to the vehicle body. The structure and number of the front mounting points 110 and the rear mounting points 120 can be the same or different.

[0052] When a vehicle is in motion, the underbody protection plate S in the engine compartment is subjected to certain wind and water pressure. Under the excitation of the road surface, the stress on the front mounting point 110 is greater than that on the rear mounting point 120, and the risk of cracking is higher on both sides and edges of the mounting point. To improve structural strength, in one embodiment, multiple intersecting ribs 220 are evenly arranged radially outward around the front mounting point 110 of the underbody protection plate S. In another embodiment, raised ribs 230 are provided on the outer side of the front mounting point 110 of the underbody protection plate S.

[0053] When the two methods described above are combined, the raised ribs 230 are located outside the cross ribs 220 of each front mounting point 110. The design of the cross ribs 220 of the front mounting points 110 not only effectively improves the local stiffness at the mounting point, but also the design of the raised ribs 230 on the outside of the front mounting points 110, which separates the side edge from the mounting point by reinforcing ribs, greatly improves the local strength.

[0054] like Figure 3As shown, the vehicle's engine compartment underbody protection plate S is bolted to the vehicle body via three front mounting points 110 and four rear mounting points 120. The design of the radiating cross ribs 220 near the front mounting points 110 and the design of the protruding ribs 230 on the left and right sides of the cross ribs 220, so that the side edges of the vehicle's engine compartment underbody protection plate S and the mounting points are separated by reinforcing ribs, thereby improving local strength.

[0055] In a specific embodiment, the front end of the vehicle engine compartment underbody panel S is provided with several longitudinal ribs 210. The longitudinal ribs 210 are arranged along both the front and rear ends. Specifically, five sets of front longitudinal ribs 210 can be provided at the front end, with three reinforcing ribs arranged in each set of longitudinal ribs 210, which can reduce the deformation of the front end of the vehicle engine compartment underbody panel S and improve the front end rigidity.

[0056] To improve the structural strength of the front center, the longitudinal rib 210 is located near the front center of the vehicle's engine compartment lower guard plate S.

[0057] It should be noted that the longitudinal reinforcement 210, the cross reinforcement 220 and the convex reinforcement 230 are all reinforcing bars. They adopt different structural forms and are set in different positions. The number of each can be selected according to actual needs.

[0058] Of course, multiple intersecting ribs 220 can also be arranged radially outward around the rear mounting point 120 of the vehicle engine compartment underbody panel S. Raised ribs 230 are provided on the outer side of the rear mounting point 120 of the vehicle engine compartment underbody panel S. Several longitudinal ribs 210 are provided at the rear end of the vehicle engine compartment underbody panel S.

[0059] Based on the above design, such as Figure 4 As shown, the front-end model of the vehicle body was cut out, and the stiffness performance was calculated at the same front-end positions B1, B2, B3, B4, and B5 of the two vehicle engine compartment underbody protection schemes. The results are shown in Table 2. It can be seen from the table that the front-end stiffness of the vehicle engine compartment underbody protection scheme of this scheme is significantly improved.

[0060] Table 2 Front-end stiffness of vehicle engine compartment underbody protection scheme

[0061] / Stiffness at position B1 Position B2 stiffness Position B3 stiffness Position B4 stiffness Location B5 stiffness Existing solutions 2.2 N / mm 2.2 N / mm 2.3 N / mm 2.2 N / mm 2.2 N / mm Invention Solution 19.2 N / mm 7.7 N / mm 16.9 N / mm 7.7 N / mm 19.2 N / mm Stiffness increment 773% 251% 631% 251% 773%

[0062] During the experiment, the stress near the front mounting points (S110 and 110) at the same location in both the existing technology and this solution was analyzed, such as... Figure 5 and Figure 6 As shown, the maximum stress near the front mounting point S110p1 in the prior art is 26MPa, while the maximum stress near the front mounting point 110 in this solution is 11MPa, which reduces the stress amplitude by 58%, increases the safety factor, and avoids the risk of failure.

[0063] In order to drain the accumulated water in a timely manner, the vehicle's engine compartment underbody protection plate S is also equipped with several drainage outlets 300.

[0064] In addition, this utility model also provides a vehicle, including the vehicle engine compartment underbody protection plate S in the above specific embodiments.

[0065] Obviously, vehicles including the aforementioned underbody protection plate S have the same beneficial effects, which will not be elaborated here.

[0066] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0067] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0068] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0069] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A vehicle engine compartment underbody protection plate, characterized in that, The vehicle engine compartment underbody panel (S) is an arc panel, and the curvature of the arc panel gradually decreases from the front end to the rear end. The front end of the vehicle's engine compartment underbody panel (S) is designed to overlap with the vehicle's front skin.

2. The vehicle engine compartment underbody protection plate according to claim 1, characterized in that, The vehicle's engine compartment underbody panel (S) is a plastic panel.

3. The vehicle engine compartment underbody protection plate according to claim 1, characterized in that, The rear end of the vehicle's engine compartment underbody panel (S) tends to be horizontal.

4. The vehicle engine compartment underbody protection plate according to claim 1, characterized in that, The front and rear ends of the vehicle engine compartment underbody panel (S) are respectively provided with a front mounting point (110) and a rear mounting point (120) for connecting with the vehicle body.

5. The vehicle engine compartment underbody protection plate according to claim 4, characterized in that, The vehicle engine compartment underbody panel (S) has multiple intersecting ribs (220) arranged radially outward around the front mounting point (110). And / or, the vehicle engine compartment underbody panel (S) is provided with a raised rib (230) on the outside of the front mounting point (110).

6. The vehicle engine compartment underbody protection plate according to claim 5, characterized in that, The rib (230) is located outside the cross rib (220) of each front mounting point (110).

7. The vehicle engine compartment underbody protection plate according to claim 1, characterized in that, The front end of the vehicle's engine compartment underbody panel (S) is provided with several longitudinal ribs (210).

8. The vehicle engine compartment underbody protection plate according to claim 7, characterized in that, The longitudinal rib (210) is located near the front center of the lower guard plate (S) of the vehicle's engine compartment.

9. The vehicle engine compartment underbody protection plate according to claim 1, characterized in that, The vehicle's engine compartment underbody panel (S) is also provided with several drainage outlets (300).

10. A vehicle, characterized in that, Includes the vehicle engine compartment underbody protection panel (S) as described in any one of claims 1-9.

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