A wind resistance reduction deflector with a guide channel, a vehicle underbody device, and a vehicle

Abstract

This invention discloses a wind resistance-reducing air deflector with a guide channel, a vehicle underbody device, and a vehicle. The air deflector body has its front end connected to the front of the vehicle and its rear end connected to the rear of the vehicle. A clearance hole is provided on the air deflector body, through which a protrusion from the bottom of the vehicle can extend. A guide channel is provided in front of the clearance hole, gradually sloping downwards from front to back. A lower edge step is provided behind the clearance hole, also gradually sloping downwards from front to back. The guide channel can guide the airflow in front of the protrusion from the bottom of the vehicle to the lower edge step. This design effectively avoids the protrusion from the bottom of the vehicle and guides and disperses the airflow in front of it, reducing wind resistance.

Description

Technical Field

[0001] This invention relates to the field of automotive wind resistance reduction technology, and in particular to a wind resistance reduction guide plate with guide grooves, a vehicle bottom device, and a vehicle. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Cars experience various types of resistance during operation, including air resistance, rolling resistance, acceleration resistance, and slope resistance. Air resistance (hereinafter referred to as wind resistance) accounts for over 65% of wind resistance during high-speed driving. Therefore, reducing wind resistance is a key focus in automotive R&D for new energy vehicles. Underbody deflectors are one of the most economical and effective measures for reducing wind resistance during the automotive engineering development phase. However, different companies and car models have different underbody characteristics, resulting in variations in the function and shape of underbody protection plates. Some underbody protection plates are designed to prevent scratches or damage to the vehicle's underbody but do not consider how to effectively reduce wind resistance, while others that do consider wind resistance reduction do not account for protrusions on the underbody, failing to simultaneously reduce wind resistance and avoid protrusions on the vehicle's underbody. For example, patent CN107199976A, entitled "Underbody Protection Plate and Motor Vehicle Including the Underbody Protection Plate," describes an underbody protection plate comprising a protective plate and an elastic component. The elastic component is disposed between the protective plate and the vehicle body. Its main purpose is to protect the underbody protection plate by preventing it from being scratched or damaged when the vehicle travels on rough roads. However, it does not address aspects related to reducing wind resistance. Patent CN201710701160.2, entitled "Engine Underbody Protection Plate Assembly and Vehicle Having It," while including an air dam to reduce wind resistance, does not consider the impact of protrusions on the vehicle's underside on wind resistance and does not combine wind resistance reduction with the avoidance of protrusions on the vehicle's underside. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a wind resistance reducing guide plate with a guide groove, a vehicle bottom device and a vehicle, which can effectively avoid protrusions on the bottom of the vehicle and effectively reduce wind resistance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In the first aspect, a wind resistance reduction deflector with a deflector groove is proposed, including a deflector body, the front end of the deflector body being connected to the front of the vehicle, and the rear end of the deflector body being connected to the rear of the vehicle; an avoidance hole is provided on the deflector body, through which a protrusion at the bottom of the vehicle can protrude; a deflector groove is provided in front of the avoidance hole, the deflector groove gradually sloping downwards in the direction from front to back; a lower edge step is provided behind the avoidance hole, the lower edge step gradually sloping downwards in the direction from front to back; the deflector groove can guide the airflow in front of the protrusion at the bottom of the vehicle to the lower edge step.

[0007] Secondly, a vehicle underbody device is proposed, including a wind resistance reducing guide plate with a guide groove as proposed in the first aspect.

[0008] Thirdly, a vehicle is proposed, including a vehicle underbody device proposed in the second aspect.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] This invention effectively avoids protrusions at the bottom of a vehicle by setting a clearance hole. A guide channel is set in front of the clearance hole, and a lower edge step is set behind the clearance hole. The guide channel guides the airflow in front of the protrusion at the bottom of the vehicle. The guided airflow does not pass through the protrusion and can flow directly to the lower edge step. While avoiding the protrusion at the bottom of the vehicle, it effectively guides the airflow at the bottom of the vehicle, thereby reducing wind resistance. The structure is simple and easy to install.

[0011] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0012] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0013] Figure 1 This is a schematic diagram of the overall structure of the wind resistance reduction guide plate disclosed in the embodiment;

[0014] Figure 2 A side view of the lower step is disclosed for an embodiment;

[0015] Figure 3 A top view of the lower edge step is disclosed for an embodiment;

[0016] Figure 4 This is a schematic diagram of the structure of the clearance hole disclosed in the embodiment;

[0017] Figure 5 The front view of the guide channel is disclosed for an embodiment;

[0018] Figure 6 The side view of the guide channel is disclosed for an embodiment.

[0019] Among them: 1. Lower edge step, 2. Clearance hole, 3. Guide groove, 4. Fixing bolt, 5. Fixing bolt, 6. Rounded corner at point A, 7. Rounded corner at point B. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] Example 1

[0023] Air drag coefficient C d It is a standard for measuring the amount of air resistance a car experiences, according to the formula Fw = 1 / 2 * C d *A*ρ*Ur 2 In the formula, A is the frontal area, ρ is the air density, and Ur is the relative velocity. Under otherwise constant conditions, a lower drag coefficient results in lower air resistance Fw. Experiments show that a 10% reduction in drag coefficient increases the driving range by approximately 3%. This embodiment, based on the principle of reducing drag coefficient and thus reducing air resistance, proposes a drag-reducing air deflector with guide channels to reduce air resistance by reducing external drag, i.e., by guiding airflow at the bottom.

[0024] This embodiment discloses a wind resistance reduction guide plate with guide grooves, such as... Figures 1-6 As shown, the device includes a deflector body, with its front end connected to the front of the vehicle and its rear end connected to the rear of the vehicle. An obstacle avoidance hole 2 is provided on the deflector body, allowing protrusions from the bottom of the vehicle to extend through it, effectively avoiding these protrusions. A flow guide trough 3 is provided in front of the obstacle avoidance hole 2, gradually sloping downwards from front to back. A lower edge step 1 is provided behind the obstacle avoidance hole 2, also gradually sloping downwards from front to back. The flow guide trough 3 guides the airflow in front of the protrusions from the bottom of the vehicle to the lower edge step 1, preventing it from flowing past the protrusions.

[0025] This embodiment discloses a wind resistance reduction deflector with a deflector groove. It adopts an integrated structure. The front end of the deflector body is connected to the battery pack mounting point, the rear end of the deflector body is connected to the rear bumper, the two sides of the deflector body are connected to the subframe bracket, and the two sides of the deflector body are adapted to the wheel arches of the car. The deflector is installed at the bottom of the vehicle, directly below the motor and reducer.

[0026] Preferably, the front end of the deflector body is connected to the battery pack mounting point by six fixing bolts, the two sides of the deflector body are connected to the subframe bracket by four fixing bolts 4, and the rear end of the deflector body is connected to the rear bumper by three fixing bolts 5. All thirteen fixing bolts are M6x20 bolts.

[0027] The position and size of the clearance hole 2 are determined based on the position and shape of the protrusion on the bottom of the vehicle. During vehicle operation, the protrusion can extend from the clearance hole 2, effectively avoiding it. For example, it can be set as follows... Figure 4 The clearance hole shown has a Y-axis length of 252.31 mm and an X-axis length of 251.65 mm. The clearance hole also has a fillet 6 at point A and a fillet 7 at point B. The radius of fillet 6 at point A is 70 mm and the radius of fillet 7 at point B is 50 mm.

[0028] like Figure 1 As shown, a guide groove 3 is provided in front of the clearance hole 2, and a lower edge step 1 is provided behind the clearance hole 2.

[0029] like Figure 5 , Figure 6 As shown, the front end of the guide channel 3 is close to the front end of the guide plate body, and the rear end of the guide channel 3 is close to the clearance hole 2. The guide channel 3 gradually slopes downward in the direction from front to back, thereby guiding the airflow in front of the protrusion at the bottom of the vehicle, so that the guided airflow does not flow through the protrusion at the bottom of the vehicle.

[0030] To ensure that the airflow under the vehicle does not flow over the protrusion at the bottom of the vehicle, the Y-direction length of the guide channel 3 is set to be greater than the Y-direction length of the clearance hole 2. The left end of the guide channel 3 is located to the left of the left end of the clearance hole 2, and the right end of the guide channel 3 is located to the right of the right end of the clearance hole 2. The front end length of the guide channel 3 is less than the rear end length of the guide channel 3. The left and right ends of the guide channel are symmetrical about the center line of the guide channel. The guide channel 3 is used to guide all the airflow in front of the protrusion.

[0031] The Y-axis and X-axis lengths of the airflow guide 3 are determined based on the dimensions of the clearance hole 2 and the extent to which the vehicle's bottom protrusion extends beyond the clearance hole. The airflow guide 3 only needs to ensure that all airflow in front of the vehicle's bottom protrusion is directed to the lower edge step, without passing over the protrusion itself. For example, it can be configured as follows... Figure 5 , Figure 6 The guide channel shown has a draft angle of 2.3°, a Y-axis length of 252.31 mm, and an X-axis length of 145.42 mm. This size guide channel can guide all the airflow in front of the protrusion at the bottom of the vehicle to the lower edge step, instead of flowing through the protrusion at the bottom of the vehicle.

[0032] The draft angle of the guide channel is the acute angle between the front and rear ends of the guide channel and the horizontal direction.

[0033] The draft angle is the minimum angle that allows all the airflow in front of the protrusion at the bottom of the vehicle to be guided to the lower edge step. At this draft angle, all the airflow in front of the protrusion at the bottom of the vehicle can be effectively guided, and after guidance, all the airflow flows to the lower edge step instead of passing through the protrusion at the bottom of the vehicle, and the wind resistance is minimized.

[0034] The lower edge step 1 guides the airflow from the guide channel 3, thereby reducing wind resistance. Preferably, the lower edge step 1 is located at the rear of the guide plate body, with its front end near the clearance hole 2 and its rear end near the rear of the guide plate body. The lower edge step gradually slopes downward from front to back, with its Y-axis length greater than that of the guide channel 3, and its rear end length less than its front end length. This allows for complete guidance of the airflow from the guide channel 3, reducing wind resistance. For example, it can be configured as follows... Figure 2 , Figure 3 The lower step shown has a Y-axis length of 1120mm and a slope width of 67mm connecting the front and rear ends of the lower step.

[0035] In this embodiment, the front length of the lower edge step 1 is basically the same as the length of the guide plate body, so as to not only guide the airflow from the guide groove 3, but also effectively guide the remaining airflow at the bottom of the vehicle, thereby reducing the overall wind resistance at the bottom of the vehicle.

[0036] Simulation analysis was used to verify the wind resistance reduction guide plate with guide grooves disclosed in this embodiment. The wind resistance reduction guide plate disclosed in this embodiment can effectively reduce wind resistance by 5.2 counts. Under the same conditions, without increasing the battery capacity or weight, the vehicle's range can be increased by about 3km, which is equivalent to a reduction of about 0.4kWh in battery capacity, or a reduction of about 480 yuan in cost per vehicle. Based on an annual sales volume of 100,000 vehicles, this translates to an annual cost reduction of 48 million yuan, making it a simple and efficient cost reduction and efficiency improvement measure.

[0037] This embodiment discloses a wind resistance reduction deflector with a deflector groove. By setting a clearance hole, it effectively avoids protrusions at the bottom of the vehicle. By setting a deflector groove in front of the clearance hole and a lower edge step behind the clearance hole, the deflector groove guides the airflow in front of the protrusion at the bottom of the vehicle. The guided airflow does not pass through the protrusion and can flow directly to the lower edge step. On the basis of avoiding the protrusion at the bottom of the vehicle, it effectively guides the airflow at the bottom of the vehicle, thereby reducing wind resistance. The structure is simple and easy to install.

[0038] It should be noted that: the Y direction is the direction formed by connecting the front and rear ends of the guide vane body, and the X direction is the direction formed by connecting the left and right ends of the guide vane body.

[0039] Example 2

[0040] This embodiment discloses a vehicle bottom device, including a wind resistance reducing guide plate with a guide groove disclosed in Embodiment 1.

[0041] Example 3

[0042] This embodiment discloses a vehicle including a vehicle underbody device disclosed in Embodiment 2.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A wind resistance reducing deflector with flow guide slots, characterized in that, The system includes a deflector body, with its front end connected to the front of the vehicle and its rear end connected to the rear of the vehicle. A clearance hole is provided on the deflector body, allowing any protrusion from the bottom of the vehicle to extend through it. A flow channel is provided in front of the clearance hole, gradually sloping downwards from front to back. A lower edge step is provided behind the clearance hole, also gradually sloping downwards from front to back. The flow channel guides the airflow in front of the protrusion from the bottom of the vehicle to the lower edge step, preventing it from flowing over the protrusion. The front end length of the flow channel is shorter than the rear end length, the Y-axis length of the lower edge step is longer than the Y-axis length of the flow channel, the rear end length of the lower edge step is shorter than the front end length, and the front end length of the lower edge step is approximately the same as the length of the deflector body.

2. The air resistance reducing deflector with guide grooves according to claim 1, characterized in that, The front end of the deflector body is connected to the battery pack mounting point, and the rear end of the deflector body is connected to the rear bumper.

3. The air resistance reducing deflector with guide grooves according to claim 1, characterized in that, The deflector body is connected to the subframe bracket on both sides.

4. The air resistance reduction guide plate with flow guide slots according to claim 1, characterized in that, The sides of the deflector body are adapted to fit the car wheel arches.

5. A wind resistance reduction guide plate with guide grooves as described in claim 1, characterized in that, The left end of the guide channel is located to the left of the left end of the clearance hole, and the right end of the guide channel is located to the right of the right end of the clearance hole.

6. A wind resistance reduction guide plate with guide grooves as described in claim 1, characterized in that, The left and right ends of the guide channel are symmetrical about the center line of the guide channel.

7. A wind resistance reduction guide plate with guide grooves as described in claim 1, characterized in that, The lower edge step is located at the rear of the guide vane body.

8. A vehicle underbody device, characterized in that, Including the wind resistance reduction guide plate with guide groove as described in any one of claims 1-7.

9. A vehicle, characterized in that, Includes a vehicle underbody device as described in claim 8.

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