Low-wind-resistance guard plate device, automobile exhaust system and automobile

Abstract

The invention discloses a low-wind-resistance guard plate device, an automobile exhaust system and an automobile, and relates to the field of automobiles, the low-wind-resistance guard plate device comprises a front silencer guard plate used for supporting a front silencer, an exhaust pipe guard plate used for supporting an exhaust pipe and a rear silencer guard plate used for supporting a rear silencer, the front section of the front silencer guard plate is provided with a front silencer windward side, and the rear section of the front silencer guard plate is provided with a rear silencer windward side; the front section of the rear silencing guard plate is provided with a rear silencing windward side, and the front silencing windward side and the rear silencing windward side are matched with the airflow streamline. According to the invention, airflow in the area near the vehicle bottom exhaust system can be controlled, and the purpose of reducing wind resistance is achieved.

Description

Technical Field

[0001] The invention relates to the field of automobiles, and in particular to a low wind resistance protective plate device, an automobile exhaust system and an automobile. Background Art

[0002] When a car is traveling at a higher speed, wind resistance becomes one of the main sources of resistance. In order to overcome this resistance, the car needs to consume more energy. Fuel vehicles will consume more fuel, while electric vehicles will consume more electricity. Since the combustion of fuel releases carbon dioxide and other greenhouse gases, higher wind resistance will lead to an increase in carbon emissions from fuel vehicles. If the wind resistance of a fuel vehicle is reduced by 0.02, the corresponding comprehensive fuel consumption can be reduced by 0.1L and carbon emissions can be reduced by 0.25 kg. In order to reduce carbon emissions from automobiles, some countries or regions have passed legislation to stipulate the wind resistance coefficient standards for automobiles, encouraging manufacturers to design more energy-saving and environmentally friendly vehicles. Therefore, in automobile design, the optimization of wind resistance reduction is of great significance.

[0003] Due to the exhaust system at the bottom of fuel vehicles and hybrid vehicles, the bottom flatness is poor, the bottom airflow is chaotic, the bottom airflow velocity is low, and the bottom airflow energy is low, which makes it impossible to balance the upper and lower vortices of the tail airflow, and the pressure on the back of the car cannot be restored, resulting in the wind resistance coefficient of fuel vehicles being above 0.32 and unable to break through further. Because the exhaust system temperature is high, the temperature of the hot end three-original catalytic converter is around 600-700 degrees, and the temperature of the cold section exhaust pipe and muffler is usually 200-300 degrees. It is impossible to improve the flatness by simply adding plastic guard plates like other areas. On the one hand, the plastic guard plate will be burned, and on the other hand, the air flow velocity in the closed space is low, and the heat cannot be taken away, which will increase the risk of heat damage to other parts at the bottom of the car body. In addition, the exhaust system is connected to the car body through a hanging ear, and it will move with the movement of the vehicle during driving. Simple guard plate sealing will bring the risk of collision and abnormal noise. Wind resistance is proportional to the square of the vehicle speed, and power consumption is proportional to the cube of the vehicle speed. Low wind resistance design at high speed is more meaningful.

[0004] For example: Chinese utility model patent CN210191658U discloses an air deflector that can reduce the wind resistance of a car. The bottom air deflector of the car includes an inclined plate portion inclined downward from front to rear, a front plate portion extending forward from the front edge of the inclined plate portion, and a rear plate portion extending backward from the rear edge of the inclined plate portion; an upwardly arched first air deflector portion is provided on the inclined plate portion, and a first air inlet is arranged rearward at the rear end of the first air deflector portion; an upwardly arched second air deflector portion is provided on the rear plate portion, and a second air inlet is arranged upward at the upper end of the second air deflector portion; and an air outlet is provided on the rear plate portion. Chinese invention patent CN115923683A discloses a rear underbody guard plate and a vehicle capable of reducing the wind resistance coefficient, wherein the rear underbody guard plate capable of reducing the wind resistance coefficient comprises a guard plate body; the guard plate body comprises a protection zone for covering the rear underbody area of ​​the vehicle, and the side of the protection zone away from the rear underbody area of ​​the vehicle has a covering plane; the connection zone is arranged around the protection zone, and comprises a front connection portion and a rear connection portion distributed along a first direction; when the guard plate body is installed in the rear underbody area of ​​the vehicle, the covering plane is close to one end of the rear connection portion. Chinese invention patent CN106379427A discloses a car with an intelligent drag reduction structure and its operation method, including a car body, a plurality of air inlets are arranged at the front end of the car body, a rotating air guide nozzle is arranged at the port of the air inlet, a lifting plate is arranged on the mouth of the rotating air guide nozzle, a balancing air outlet is arranged at the bottom of the car body, an opening and closing plate is arranged on the balancing air outlet, a plurality of air outlets are arranged at the rear end of the car body, a swinging air guide plate is arranged at the port of the air outlet, a lifting cover is arranged on the port of the air outlet, the air inlet and the air outlet are connected by a plurality of air ducts, the balancing air outlet and the air outlet are connected by a bottom air duct, and a drainage door is arranged at the tail of the bottom air duct.

[0005] The above solution mainly focuses on the area outside the exhaust system coverage to solve the problems of poor flatness and chaotic bottom airflow in the high-temperature area of ​​the bottom exhaust system of fuel vehicles and hybrid vehicles, and its versatility is not strong. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a low wind resistance guard plate device, an automobile exhaust system and an automobile, which can control the airflow in the area near the exhaust system at the bottom of the vehicle and achieve the purpose of reducing wind resistance.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, an embodiment of the present invention provides a low wind resistance guard plate device, including a front muffler guard plate for supporting a front muffler, an exhaust pipe guard plate for supporting an exhaust pipe, and a rear muffler guard plate for supporting a rear muffler, wherein the front section of the front muffler guard plate has a front muffler windward surface, and the front section of the rear muffler guard plate has a rear muffler windward surface, and the front muffler windward surface and the rear muffler windward surface are adapted to the airflow streamline.

[0009] As a further implementation method, the front fire protection plate is installed with a front fire support structure, and the front fire support structure is used to fix the front muffler; the rear fire protection plate is installed with a rear fire support structure, and the rear fire support structure is used to fix the rear muffler.

[0010] As a further implementation method, the front section of the exhaust pipe guard plate is in contact with the bottom surface of the exhaust pipe, and the rear section is installed with a supporting component, and the supporting component is used to fix the exhaust pipe.

[0011] As a further implementation method, the Z-direction heights of the front fire protection plate and the exhaust pipe protection plate are adapted to the bottom protection plate of the vehicle body.

[0012] As a further implementation method, the front fire protection plate, the exhaust pipe protection plate and the rear fire protection plate are made of high temperature resistant material.

[0013] As a further implementation method, the angles of the front windward surface and the rear windward surface are obtained based on automobile flow field simulation results and test results.

[0014] In a second aspect, an embodiment of the present invention further provides an automobile exhaust system equipped with the low wind resistance guard plate device.

[0015] As a further implementation method, the front exhaust guard plate is fixed to the lower side of the front muffler, the exhaust pipe guard plate is fixed to the lower side of the exhaust pipe, and the rear exhaust guard plate is fixed to the lower side of the rear muffler.

[0016] As a further implementation, the exhaust pipe is provided with a plurality of exhaust lifting ears and hooks, and the number and installation positions of the exhaust lifting ears and hooks are adjusted based on the exhaust system mode.

[0017] In a third aspect, an embodiment of the present invention further provides a car, the bottom of which is equipped with the exhaust system.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) The guard plate device of the present invention is installed at the bottom of the exhaust system, and the shape of the guard plate is adjusted according to the airflow streamline at the bottom of the vehicle. When viewed from the front of the vehicle, the airflow entering the middle channel is reduced under the influence of the windward surface of the guard plate; when viewed from the side, the airflow can stick to the surface of the exhaust system guard plate, the bottom airflow is updated and stabilized, and the airflow speed is increased; the pressure recovery at the back of the vehicle is improved, and the wind resistance of the vehicle is reduced.

[0020] (2) The front sections of the front fire protection plate and the rear fire protection plate of the present invention are designed with windward surfaces, and the angle of the windward surface is optimized based on the automobile flow field simulation results and test results; the front section of the exhaust pipe protection plate is tightly attached to the lower side of the exhaust pipe, and the Z-direction heights of the front fire protection plate and the exhaust pipe protection plate match those of other protection plates at the bottom to improve the overall flatness of the bottom; the protection plate device is connected to the exhaust system as a whole through a corresponding supporting structure to avoid abnormal noise during driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 is an isometric view of the installation of a low wind resistance guard plate device according to one or more embodiments of the present invention;

[0023] Figure 2 is a side view of a low wind resistance guard plate device installed according to one or more embodiments of the present invention;

[0024] Figure 3 This is a schematic diagram of the cold section structure of a traditional exhaust system;

[0025] Figure 4 is a schematic diagram of the exhaust system structure according to one or more embodiments of the present invention;

[0026] Figure 5 is an assembly diagram of an exhaust system and other guard plates according to one or more embodiments of the present invention.

[0027] Among them, 1. front muffler; 2. exhaust pipe; 3. rear muffler; 4. front muffler guard plate; 5. exhaust pipe guard plate; 6. rear muffler guard plate; 7. front muffler supporting structure; 8. supporting components; 9. rear muffler supporting structure; 10. front muffler windward surface; 11. rear muffler windward surface; 12. exhaust lifting ear. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] Glossary: ​​Front fire guard plate refers to the guard plate used to install the front muffler; rear fire guard plate refers to the guard plate used to install the rear muffler; exhaust pipe guard plate refers to the guard plate used to install the exhaust pipe;

[0030] Similarly, the front exhaust support structure, the rear exhaust support structure, the front exhaust windward surface, and the rear exhaust windward surface are all functionally named components.

[0031] Embodiment 1:

[0032] This embodiment provides a low wind resistance guard plate device, such as Figure 1 , Figure 2 and Figure 4As shown, it includes a front fire protection plate 4, an exhaust pipe protection plate 5 and a rear fire protection plate 6. The front fire protection plate 4 is used to support the front muffler 1, the exhaust pipe protection plate 5 is used to support the exhaust pipe 2, and the rear fire protection plate 6 is used to support the rear muffler 3. According to the vehicle data, through CFD simulation means, based on the airflow field results of the high-speed driving of the vehicle, the shapes, sizes and positions of the front fire protection plate 4, the exhaust pipe protection plate 5 and the rear fire protection plate 6 are designed.

[0033] Among them, the calculation process of the airflow field results of a car running at high speed is a prior art and will not be repeated here.

[0034] It should be noted that the “front” and “rear” in this embodiment are based on the direction of the vehicle body.

[0035] The front section of the front fireproof plate 4 has a front fireproof windward surface 10, and the front section of the rear fireproof plate 6 has a rear fireproof windward surface 11. The angles of the front fireproof surface 10 and the rear fireproof surface 11 are optimized according to the automobile flow field simulation results and test results.

[0036] like Figure 2 As shown, the front exhaust guard plate 4 is fixed to the front muffler 1 through the front exhaust support structure 7, the rear exhaust guard plate 6 is fixed to the rear muffler 3 through the rear exhaust support structure 9, and the exhaust pipe guard plate 5 is fixed to the exhaust pipe 2 through the support component 8. Specifically, the front exhaust support structure 7 includes a plurality of front exhaust support parts, which are welded and fixed to the front muffler 1, and the front muffler 1 is supported by the plurality of front exhaust support parts. The number of the front exhaust support parts is determined according to the size of the front exhaust guard plate 4. The front exhaust support part is a bracket or other supporting structure.

[0037] The front section of the exhaust pipe guard plate 5 is closely attached to the lower side of the exhaust pipe 2, and the rear section of the exhaust pipe guard plate 5 is fixed to the wall of the exhaust pipe 2 by a plurality of support members 8. The number of support members 8 is determined by the size and weight of the exhaust pipe guard plate 5. In this embodiment, the support member 8 is a metal block, which is welded and fixed to the wall of the exhaust pipe 2. Exhaust lugs 12 and hooks are installed on the exhaust pipe 2. By calculating the exhaust system mode, the number and installation position of the exhaust lugs 12 and hooks are adjusted to ensure that the exhaust system does not have abnormal noise.

[0038] The rear muffler support structure 9 includes a plurality of rear muffler support parts, which also use brackets or other support structures; the rear muffler support parts are fixed to the rear muffler 3 by welding or other processes. Since the rear muffler guard plate 6 is close to the rear bumper, the design of the rear muffler guard plate 6 needs to consider the departure angle to ensure the passability of the car, and consider the transition with the shape of the rear bumper to guide the airflow to balance the tail airflow vortex up and down.

[0039] like Figure 5As shown, the Z-direction height of the front fire guard plate 4 and the exhaust pipe guard plate 5 needs to match with other guard plates at the bottom, that is, the Z-direction height of the front fire guard plate 4 and the exhaust pipe guard plate 5 is adjusted according to the height of the bottom guard plate of the vehicle and the front and rear frames to improve the overall flatness of the bottom and ensure the latest ground clearance from the guard plate to the ground.

[0040] The exhaust system of this embodiment mainly considers the exhaust cooling section. Since the surface temperature of the exhaust cooling section is about 200-300 degrees, the front exhaust guard plate 4, the exhaust pipe guard plate 5 and the rear exhaust guard plate 6 are all made of high temperature resistant materials, such as metal materials or other new materials, and the materials used must ensure the heat dissipation of the exhaust system. The key parts of each guard plate are made of metal materials such as stainless steel, which have strong durability; direct welding and bracket support ensure its reliability and stability.

[0041] The guard plate device of this embodiment is installed at the bottom of the exhaust system. When viewed from the front of the vehicle, the airflow entering the middle channel is reduced under the influence of the windward surface of the guard plate; when viewed from the side, the airflow can stick to the surface of the exhaust system guard plate, the bottom airflow is updated and stabilized, and the airflow speed is increased; the pressure recovery at the back of the vehicle is improved, and the wind resistance of the entire vehicle is reduced.

[0042] The shape of the guard plate in this embodiment is designed according to the airflow at the bottom of the whole vehicle, and the area of ​​the guard plate is as large as possible to ensure the coverage area of ​​the guard plate; after adding the guard plate, the flatness of the bottom is improved, the gap between the bottom and the ground is reduced, and the airflow velocity at the bottom of the car is increased, so that the tail vortex on the back of the vehicle is symmetrical up and down, and the pressure on the back is restored, thereby reducing the airflow resistance of the whole vehicle and reducing the energy consumption of the car during driving; the structural design of the guard plate is not constrained, which ensures the beauty of the bottom and the design freedom.

[0043] Embodiment 2:

[0044] This embodiment provides an automobile exhaust system, such as Figure 3 As shown, the exhaust system includes a front muffler 1, an exhaust pipe 2, and a rear muffler 3, and the exhaust pipe 2 is connected between the front muffler 1 and the rear muffler 3; Figure 4 As shown, the low wind resistance guard plate device described in Example 1 is installed on the exhaust system; wherein the front exhaust guard plate 4 is fixed to the lower side of the front muffler 1, the exhaust pipe guard plate 5 is fixed to the lower side of the exhaust pipe 2, and the rear exhaust guard plate 6 is fixed to the lower side of the rear muffler 3; the guard plate device and the exhaust system are formed into a whole through the rigid connection between the guard plate and the muffler and the exhaust pipe 2. When the vehicle accelerates or decelerates or passes through a pit or a threshold, each guard plate moves with the exhaust system, and the guard plate position is in a floating state, which can avoid abnormal noise caused by the collision between the guard plate and the exhaust system.

[0045] Embodiment 3:

[0046] This embodiment provides a car, the exhaust system described in Example 2 is installed at the bottom of which, based on wind tunnel tests or simulation calculations, when fuel and hybrid vehicles travel at a speed of 120km / h, the bottom airflow can be effectively improved to reduce the vehicle's drag coefficient by 10-20count.

[0047] 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 low wind resistance guard plate device, characterized in that: It comprises a front muffler shield for supporting a front muffler, an exhaust pipe shield for supporting an exhaust pipe and a rear muffler shield for supporting a rear muffler. The front section of the front muffler shield has a front muffler windward surface, and the front section of the rear muffler shield has a rear muffler windward surface. The front muffler windward surface and the rear muffler windward surface are adapted to the airflow streamline.

2. A low wind resistance shield device according to claim 1, characterized in that: The front fire protection plate is installed with a front fire support structure, and the front fire support structure is used to fix the front muffler; the rear fire protection plate is installed with a rear fire support structure, and the rear fire support structure is used to fix the rear muffler.

3. A low wind resistance shield device according to claim 1 or 2, characterized in that: The front section of the exhaust pipe guard plate is in contact with the bottom surface of the exhaust pipe, and the rear section is provided with a supporting component, and the supporting component is used to fix the exhaust pipe.

4. A low wind resistance shield device according to claim 3, characterized in that: The Z-direction heights of the front fire protection plate and the exhaust pipe protection plate are matched with the bottom protection plate of the vehicle body.

5. A low wind resistance shield device according to claim 1 or 2, characterized in that: The front fire protection plate, the exhaust pipe protection plate and the rear fire protection plate are made of high temperature resistant material.

6. The low wind resistance shield device according to claim 1, characterized in that: The angles of the front windward surface and the rear windward surface are obtained based on automobile flow field simulation results and test results.

7. An automobile exhaust system, characterized in that: A low wind resistance guard plate device as described in any one of claims 1-6 is installed.

8. An automobile exhaust system according to claim 7, characterized in that: The front fire protection plate is fixed to the lower side of the front muffler, the exhaust pipe protection plate is fixed to the lower side of the exhaust pipe, and the rear fire protection plate is fixed to the lower side of the rear muffler.

9. An automobile exhaust system according to claim 8, characterized in that: The exhaust pipe is provided with a plurality of exhaust lifting ears and hooks, and the number and installation positions of the exhaust lifting ears and hooks are adjusted based on the exhaust system mode.

10. An automobile, characterized in that: An exhaust system as described in any one of claims 7 to 9 is installed at the bottom.

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