Low wind resistance baffle device, automobile exhaust system and automobile

Abstract

The application discloses a low-wind-resistance shield device, an automobile exhaust system and an automobile, and relates to the automobile field, wherein the low-wind-resistance shield device 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, a front windward surface of a front section of the front muffler shield and a rear windward surface of a front section of the rear muffler shield are adapted to the airflow streamline. The application can control the airflow near the bottom exhaust system of the vehicle and reduce the wind resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobiles, in particular to a low wind resistance shield device, an automobile exhaust system and an automobile. BACKGROUND

[0002] When the automobile travels at a high speed, wind resistance becomes one of the main sources of resistance. In order to overcome this resistance, the automobile needs to consume more energy, the fuel vehicle will consume more fuel, and the electric vehicle will consume more electric energy. Since the combustion of fuel releases carbon dioxide and other greenhouse gases, higher wind resistance will lead to an increase in carbon emissions of fuel vehicles. Reducing the overall wind resistance of a fuel vehicle by 0.02 can reduce the overall fuel consumption by 0.1L and reduce carbon emissions by 0.25kg. In order to reduce the carbon emissions of automobiles, some countries or regions have legislated standards for the wind resistance coefficient of automobiles, encouraging manufacturers to design more energy-efficient and environmentally friendly vehicles. Therefore, the significance of wind resistance optimization in automobile design is enormous.

[0003] Due to the presence of the exhaust system at the bottom of the fuel vehicle and hybrid vehicle, the flatness of the bottom is poor, the airflow at the bottom is chaotic, the airflow velocity at the bottom is low, and the airflow energy at the bottom is low, which causes the up and down vortexes of the tail airflow to be unbalanced, the pressure at the back of the automobile cannot be restored, and the wind resistance coefficient of the fuel vehicle is always above 0.32, which cannot be further broken through. Because the exhaust system is high in temperature, the temperature of the hot end three-way catalyst is about 600-700 degrees, and the temperature of the cold section exhaust pipe and muffler is usually 200-300 degrees, which cannot be improved in flatness by simply adding a plastic shield as in other areas. On the one hand, the plastic shield will be burned out, and on the other hand, the airflow velocity in the enclosed space is small, and the heat cannot be taken away, which will increase the risk of heat damage to other components at the bottom of the vehicle body. And the exhaust system is connected with the vehicle body through a hanger, which will move with the movement of the vehicle during vehicle travel. The simple shield sealing will bring the risk of collision noise. The wind resistance is proportional to the square of the speed, and the power consumption is proportional to the third power of the speed. Low wind resistance design at high speed is more meaningful.

[0004] For example: Chinese utility model patent CN210191658U discloses a kind of wind deflector capable of reducing automobile wind resistance, automobile bottom fairwater includes from front to rear downwardly inclined inclined plate portion, front plate portion extending from the front edge of inclined plate portion and rear plate portion extending from the rear edge of inclined plate portion;Inclined plate portion is equipped with the first wind guide portion that is arched upwards, and the rear end of first wind guide portion is provided with the first air inlet towards rear;Rear plate portion is equipped with the second wind guide portion that is arched upwards, and the upper end of second wind guide portion is provided with the second air inlet towards upper;Rear plate portion is equipped with air outlet.Chinese invention patent CN115923683A discloses a kind of automobile rear bottom guard plate capable of reducing wind resistance coefficient and vehicle, wherein the automobile rear bottom guard plate capable of reducing wind resistance coefficient includes guard plate body;Guard plate body includes protective zone for covering automobile rear bottom area, and the side of protective zone away from automobile rear bottom area has covering plane;Connection zone is set at the periphery of protective zone, including front end connection part and rear end connection part distributed along first direction;When guard plate body is installed in automobile rear bottom area, covering plane is close to one end of rear end connection part.Chinese invention patent CN106379427A discloses a kind of automobile with intelligent drag reduction structure and its operation mode, including vehicle body, the front end of vehicle body is provided with a plurality of air inlets, the port of air inlet is provided with rotating air deflector, the mouth of rotating air deflector is provided with lifting plate, the bottom of vehicle body is provided with balance air port, the balance air port is provided with opening and closing plate, the rear end of vehicle body is provided with a plurality of air outlets, the port of air outlet is provided with swinging air deflector, the port of air outlet is provided with lifting cover, air inlet and air outlet are communicated by a plurality of air ducts, balance air port and air outlet are communicated by bottom air duct, and the tail of bottom air duct is provided with drain door.

[0005] The above scheme mainly focuses on the area outside the exhaust system coverage to solve the problems of poor flatness and chaotic airflow in the high-temperature area of the exhaust system of fuel vehicles and hybrid vehicles, and the universality is not strong. SUMMARY

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

[0007] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0008] In the first aspect, the embodiments of the present application provide a low-drag guard plate device, which includes a front muffler support guard plate for supporting a front muffler, an exhaust pipe support guard plate for supporting an exhaust pipe, and a rear muffler support guard plate for supporting a rear muffler, the front section of the front muffler support guard plate has a front wind-facing surface, and the front wind-facing surface and the rear wind-facing surface of the rear muffler support guard plate are adapted to the airflow streamline.

[0009] As a further implementation manner, the front muffler guard plate is installed with a front muffler supporting structure for fixing the front muffler; and the rear muffler guard plate is installed with a rear muffler supporting structure for fixing the rear muffler.

[0010] As a further implementation manner, the front section of the exhaust pipe guard plate is attached to the bottom surface of the exhaust pipe, and the rear section is installed with a supporting component for fixing the exhaust pipe.

[0011] As a further implementation manner, the Z-direction height of the front muffler guard plate and the exhaust pipe guard plate is matched with the bottom guard plate of the vehicle body.

[0012] As a further implementation manner, the front muffler guard plate, the exhaust pipe guard plate and the rear muffler guard plate are made of high-temperature resistant materials.

[0013] As a further implementation manner, the angles of the front windward surface of the front muffler guard plate and the rear windward surface of the rear muffler guard plate are obtained based on the simulation results and the test results of the flow field of the vehicle.

[0014] In the second aspect, the embodiments of the present application further provide an exhaust system of a vehicle, which is installed with the low wind resistance guard plate device.

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

[0016] As a further implementation manner, the exhaust pipe is provided with a plurality of exhaust hangers and hooks, and the exhaust hangers and hooks are adjusted in number and installed in position based on the modal of the exhaust system.

[0017] In the third aspect, the embodiments of the present application further provide a vehicle, which is installed with the exhaust system at the bottom.

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

[0019] (1) The guard plate device of the present application is installed at the bottom of the exhaust system, and the shape of the guard plate is adjusted according to the flow lines of the bottom of the vehicle. From the front of the vehicle, the flow of the air entering the middle passage is reduced under the influence of the windward surface of the guard plate; from the side, the air flow can be attached to the surface of the exhaust system guard plate, the bottom air flow is renewed and stabilized, the air flow speed is improved; the pressure recovery at the back of the vehicle is improved, and the wind resistance of the vehicle is reduced.

[0020] (2) The front muffler guard plate and the rear muffler guard plate are both designed with windward surfaces, and the angle of the windward surface is optimized according to the simulation results and the test results of the flow field of the vehicle; the front section of the exhaust pipe guard plate is attached to the lower side of the exhaust pipe, and the Z-direction height of the front muffler guard plate and the exhaust pipe guard plate is matched with other guard plates at the bottom, so as to improve the overall flatness of the bottom; the guard plate device and the exhaust system are connected as a whole through corresponding supporting structures, so as to avoid abnormal noise during driving. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated by reference in their entirety. The embodiments depicted herein, and described in connection therewith, are not meant to be construed as limiting the application.

[0022] Figure 1 is a low-drag fairing device mounting isosceles trapezoid view according to one or more embodiments of the present application;

[0023] Figure 2 is a low-drag fairing device mounting side view according to one or more embodiments of the present application;

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

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

[0026] Figure 5 is an assembly view of an exhaust system with other fairings according to one or more embodiments of the present application.

[0027] Wherein, 1, front muffler; 2, exhaust pipe; 3, rear muffler; 4, front muffler fairing; 5, exhaust pipe fairing; 6, rear muffler fairing; 7, front muffler support structure; 8, support component; 9, rear muffler support structure; 10, front muffler windward surface; 11, rear muffler windward surface; 12, exhaust hanger lug. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed description is merely illustrative, and is intended to provide further description of the application. Unless otherwise defined, 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 belongs.

[0029] Glossary: front muffler fairing refers to a fairing for mounting a front muffler; rear muffler fairing refers to a fairing for mounting a rear muffler; exhaust pipe fairing refers to a fairing for mounting an exhaust pipe;

[0030] Similarly, front muffler support structure, rear muffler support structure, front muffler windward surface, rear muffler windward surface are functionally named components.

[0031] Example 1:

[0032] This example provides a low-drag fairing device, such as Figure 1 , Figure 2 and Figure 4As shown, including front baffle 4, exhaust pipe baffle 5 and rear baffle 6, front baffle 4 for supporting front muffler 1, exhaust pipe baffle 5 for supporting exhaust pipe 2, rear baffle 6 for supporting rear muffler 3, according to the vehicle data, through CFD simulation means, based on the results of the automobile high-speed running airflow field, the shape, size and position of front baffle 4, exhaust pipe baffle 5 and rear baffle 6 are designed.

[0033] Wherein, the calculation process of the results of the automobile high-speed running airflow field is prior art, which will not be described here.

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

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

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

[0037] The front section of the exhaust pipe baffle 5 is close to the lower side of the exhaust pipe 2, and the rear section of the exhaust pipe baffle 5 is fixed with the pipe wall of the exhaust pipe 2 by a plurality of support parts 8. The number of support parts 8 is determined by the size and weight of the exhaust pipe baffle 5. In this embodiment, the support part 8 is a metal block, which is welded and fixed with the pipe wall of the exhaust pipe 2. The exhaust pipe 2 is provided with exhaust hangers 12 and hooks, and the number and installation position of the exhaust hangers 12 and hooks are adjusted by calculating the modal of the exhaust system to ensure that the exhaust system does not produce abnormal noise.

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

[0039] As shown in Figure 5As shown, the Z-direction height of the front muffler guard 4 and the exhaust pipe guard 5 needs to match the other guards at the bottom, that is, the Z-direction height of the front muffler guard 4 and the exhaust pipe guard 5 is adjusted according to the height of the guards at the bottom of the whole vehicle and the front and rear vehicle frames, so as to improve the overall flatness of the bottom and ensure the latest ground clearance of the guards to the ground.

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

[0041] The guard device of the embodiment is installed at the bottom of the exhaust system. From the front of the vehicle, the airflow into the middle passage under the influence of the windward surface of the guard is reduced; from the side, the airflow can stick to the surface of the exhaust system guard, the airflow at the bottom is renewed and stable, and the airflow speed is improved; the pressure recovery at the back of the vehicle is good, and the wind resistance of the whole vehicle is reduced.

[0042] The shape of the guard of the embodiment is designed according to the airflow at the bottom of the whole vehicle, the area of the guard is as large as possible, and the coverage area of the guard is ensured; after the guard is added, the flatness of the bottom is improved, the gap between the bottom and the ground is reduced, the airflow speed at the bottom of the vehicle is increased, the back vortex of the vehicle is symmetrical up and down, the pressure recovery at the back is good, the airflow resistance of the whole vehicle is reduced, and the energy consumption of the vehicle during driving is reduced; the structure design of the guard is not restricted, and the beauty and design freedom of the bottom are ensured.

[0043] Embodiment 2:

[0044] The embodiment provides an automobile exhaust system, as shown in the drawings, Figure 3 The exhaust system includes a front muffler 1, an exhaust pipe 2 and a rear muffler 3, the exhaust pipe 2 is connected between the front muffler 1 and the rear muffler 3; as shown in the drawings, Figure 4 The low wind resistance guard device of embodiment 1 is installed on the exhaust system; wherein the front muffler guard 4 is fixed to the lower side of the front muffler 1, the exhaust pipe guard 5 is fixed to the lower side of the exhaust pipe 2, and the rear muffler guard 6 is fixed to the lower side of the rear muffler 3; the guards and the mufflers and the exhaust pipe 2 are hard connected, so that the guard device and the exhaust system form a whole. When the vehicle is accelerating or decelerating and passing through pits and trenches, the guards move with the exhaust system, and the position of the guards is in a floating state, which can avoid the abnormal sound caused by the impact between the guards and the exhaust system.

[0045] Embodiment 3:

[0046] The embodiment provides a car, the bottom of which is provided with the exhaust system in embodiment 2, and based on wind tunnel test or simulation calculation, when the fuel and hybrid car travels at a speed of 120km / h, the bottom airflow can be effectively improved, and the whole vehicle wind resistance coefficient is reduced by 10-20count.

[0047] The above only provides preferred embodiments of the present application and is not intended to limit the present application, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 shielding device, characterized in that, It includes a front muffler guard plate for supporting the front muffler, an exhaust pipe guard plate for supporting the exhaust pipe, and a rear muffler guard plate for supporting the rear muffler. 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. The front and rear muffler windward surfaces are adapted to the airflow streamline. The front section of the exhaust pipe guard plate is attached to the bottom surface of the exhaust pipe, and the rear section is equipped with a support component, which is used to fix the exhaust pipe. The Z-axis height of the front fire guard plate and the exhaust pipe guard plate is adapted to the bottom guard plate of the vehicle body; The supporting component is a metal block, which is welded and fixed to the exhaust pipe wall.

2. The low wind resistance shield device according to claim 1, characterized in that, The front muffler guard plate is equipped with a front muffler support structure, which is used to fix the front muffler; the rear muffler guard plate is equipped with a rear muffler support structure, which 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 fire protection plate, exhaust pipe protection plate, and rear fire protection plate are made of high-temperature resistant materials.

4. The low wind resistance shield device according to claim 1, characterized in that, The angles of the front and rear windward surfaces are obtained based on vehicle flow field simulation and experimental results.

5. A car exhaust system, characterized in that, The device is equipped with a low wind resistance shield as described in any one of claims 1-4.

6. A car exhaust system according to claim 5, characterized in that, The front muffler 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 muffler guard plate is fixed to the lower side of the rear muffler.

7. A vehicle exhaust system according to claim 6, characterized in that, The exhaust pipe is equipped with several exhaust lifting lugs and hooks, the number and installation position of which are adjusted based on the exhaust system mode.

8. A car, characterized in that, Its bottom is equipped with an exhaust system as described in any one of claims 5-7.

Images