Muffler assembly, vehicle exhaust structure, powertrain, and vehicle

Abstract

The present invention belongs to the field of vehicle exhaust technology, and relates to a muffler assembly, a vehicle exhaust structure, a powertrain, and a vehicle. The muffler assembly includes a first muffler and a second muffler, the first muffler is provided with a first inlet and a first outlet, the first inlet is suitable for connecting to a catalyst, the second muffler is provided with a second inlet and an exhaust outlet, the first outlet is connected to the second inlet; the first muffler is arranged above the rear cross beam of the subframe along the height direction of the vehicle, and the second muffler is arranged between the front anti-collision beam and the rear cross beam of the subframe along the front and rear direction of the vehicle. The muffler assembly can effectively reduce the risk of thermal damage to the entire vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle exhaust, and in particular relates to a muffler assembly, a vehicle exhaust structure, a power assembly and a vehicle. Background Art

[0002] At present, the exhaust system of hybrid vehicles is mostly arranged from the engine compartment to the rear compartment, so that the exhaust gas generated by the turbocharger is guided from the engine compartment to the rear compartment through the exhaust pipe. However, this arrangement method will cause a greater risk of heat damage to key components in the vehicle floor area, such as battery packs, rear powertrains, fuel tanks and various pipelines, requiring large-area insulation, which is costly. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the technical problem that the existing exhaust system arrangement method has a great risk of thermal damage, a muffler assembly, a vehicle exhaust structure, a power assembly and a vehicle are provided.

[0004] In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides a muffler assembly, including a first muffler and a second muffler, wherein the first muffler is provided with a first inlet and a first outlet, the first inlet is suitable for connecting to a catalyst, and the second muffler is provided with a second inlet and an exhaust outlet, the first outlet is connected to the second inlet;

[0005] The first muffler is arranged above the rear cross beam of the subframe along the height direction of the vehicle, and the second muffler is arranged between the front anti-collision beam and the rear cross beam of the subframe along the front-rear direction of the vehicle.

[0006] According to the muffler assembly of the embodiment of the present invention, the first muffler is arranged above the rear cross beam of the subframe of the vehicle along the height direction of the vehicle, and the second muffler is arranged between the front anti-collision beam of the vehicle and the rear cross beam of the subframe along the front-back direction of the vehicle, so that the exhaust gas discharged by the engine is discharged through the catalyst, the first muffler and the second muffler in sequence. The muffler assembly is arranged in the engine compartment of the vehicle, and the exhaust gas is discharged from the front side of the vehicle. Since the exhaust structure of the vehicle no longer extends to the rear compartment of the vehicle, the battery installed on the chassis is not affected by the heat damage of the exhaust heat, which can effectively reduce the risk of heat damage to the whole vehicle, while reducing the insulation cost of the whole vehicle, and can also expand the layout space of important parts such as battery packs, fuel tanks, and rear powertrains, thereby increasing the capacity of battery packs and fuel tanks and improving the cruising range of the whole vehicle.

[0007] Optionally, the first muffler is used to eliminate noise within a first frequency band, and the second muffler is used to eliminate noise within a second frequency band;

[0008] The first frequency band does not overlap with the second frequency band.

[0009] Optionally, the second frequency band is higher than the first frequency band.

[0010] Optionally, the first muffler is arranged above a transverse stabilizer bar of the front suspension system along the height direction of the vehicle.

[0011] Optionally, the second muffler includes a muffler body and an air outlet pipe, the muffler body is connected between the first muffler and the air outlet pipe, and the muffler body is used to eliminate noise in the second frequency band;

[0012] The exhaust outlet is arranged on the exhaust pipe.

[0013] Optionally, the air outlet pipe is located on at least one side of the muffler body along the left-right direction of the vehicle.

[0014] Optionally, two air outlet pipes are provided, and the two air outlet pipes are respectively provided on opposite sides of the muffler body along the left and right directions of the vehicle;

[0015] Each of the air outlet pipes is provided with an exhaust outlet.

[0016] Optionally, one end of the air outlet pipe is connected to the muffler body, and the other end of the air outlet pipe is extended toward the rear and lower side of the vehicle.

[0017] Optionally, the angle between the axis of the air outlet pipe and the front-rear direction of the vehicle is 55°.

[0018] Optionally, the muffler assembly further includes a first connecting bracket and a second connecting bracket, and the first connecting bracket and the second connecting bracket are respectively installed on opposite sides of the second muffler along the left-right direction of the vehicle;

[0019] The first connecting bracket is used to connect the left longitudinal beam of the sub-frame, and the second connecting bracket is used to connect the right longitudinal beam of the sub-frame.

[0020] Optionally, the muffler assembly further includes a third muffler, the third muffler is connected between the second muffler and the first muffler, and the third muffler is used to eliminate noise in a third frequency band;

[0021] The third muffler is arranged above the rear cross beam of the subframe along the height direction of the vehicle.

[0022] Optionally, the second frequency band is higher than the third frequency band, and the third frequency band is higher than the first frequency band.

[0023] Optionally, the first frequency band is 20 Hz-200 Hz, the second frequency band is above 2000 Hz, and the third frequency band is 500 Hz-1500 Hz.

[0024] Optionally, the muffler assembly further comprises a mounting ear, and the mounting ear is mounted on the third muffler;

[0025] The mounting lug is used to connect the rear cross beam of the subframe.

[0026] Optionally, the muffler assembly further includes a first muffler pipe connected between the first muffler and the third muffler.

[0027] Optionally, the first muffler pipe and the first muffler are integrally formed.

[0028] Optionally, the muffler assembly further includes a second muffler pipe connected between the second muffler and the third muffler.

[0029] Optionally, the second muffler pipe and the second muffler are integrally formed.

[0030] Optionally, the volume of the muffler chamber of the first muffler is smaller than the volume of the muffler chamber of the third muffler, and the volume of the muffler chamber of the third muffler is smaller than the volume of the muffler chamber of the second muffler.

[0031] Optionally, the cross section of the first muffler along the height direction of the vehicle is circular or square;

[0032] and / or, the cross section of the second muffler along the height direction of the vehicle is circular or square;

[0033] And / or, the cross-section of the third muffler along the height direction of the vehicle is circular or square.

[0034] On the other hand, an embodiment of the present invention provides a vehicle exhaust structure, including a catalyst and the above-mentioned muffler assembly, wherein the first inlet is connected to the outlet of the catalyst, and the inlet of the catalyst is suitable for connecting to the exhaust pipe of the engine.

[0035] Optionally, the vehicle exhaust structure further includes a turbocharger, which is connected between the outlet of the catalyst and the exhaust pipe of the engine.

[0036] On the other hand, an embodiment of the present invention provides a power assembly, which includes an engine and the above-mentioned vehicle exhaust structure, wherein the engine is arranged above the right longitudinal beam of the subframe along the height direction of the vehicle, and the inlet of the catalyst is connected to the exhaust pipe of the engine.

[0037] Optionally, the power assembly further includes an air intake system, which is disposed above the muffler assembly along a height direction of the vehicle, and is used to supply air to the engine.

[0038] Optionally, the power assembly further includes an electric hybrid system, and the electric hybrid system is arranged above the left longitudinal beam of the subframe along the height direction of the vehicle.

[0039] Optionally, the powertrain also includes a front suspension system, which includes a left front suspension, a right front suspension and a lateral stabilizer bar, the left front suspension is installed at the rear end of the left longitudinal beam of the subframe, the right front suspension is installed at the rear end of the right longitudinal beam of the subframe, and the lateral stabilizer bar is transmission-connected between the left front suspension and the right front suspension.

[0040] Optionally, the powertrain also includes a cooling system, which is arranged between the front bumper and the vehicle exhaust structure along the front-rear direction of the vehicle, and the cooling system is used to cool the vehicle exhaust structure, the engine and the hybrid system.

[0041] On the other hand, an embodiment of the present invention provides a vehicle, which includes the above-mentioned muffler assembly, or includes the above-mentioned vehicle exhaust structure, or includes the above-mentioned power assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a partial schematic diagram of a power assembly provided by an embodiment of the present invention;

[0043] Figure 2 yes Figure 1 A schematic diagram of the powertrain from another angle;

[0044] Figure 3 yes Figure 1 Schematic diagram of the muffler assembly.

[0045] The reference numerals in the specification are as follows:

[0046] 100, vehicle exhaust structure; 200, rear cross beam of subframe; 201, rubber lifting lug; 300, left longitudinal beam of subframe; 400, right longitudinal beam of subframe; 500, front anti-collision beam; 600, cooling system;

[0047] 1. Catalyst;

[0048] 2. Muffler assembly; 21. First muffler; 22. Second muffler; 221. Muffler body; 222. Exhaust pipe; 220. Exhaust outlet; 23. Third muffler;

[0049] 3. Install flange;

[0050] 4. Install the bracket;

[0051] 5. A first connecting bracket;

[0052] 6. A second connecting bracket;

[0053] 7. Install the lifting lugs;

[0054] 8. The first muffler;

[0055] 9. The first clamp;

[0056] 10. Second muffler;

[0057] 11. Second clamp;

[0058] x, the left and right direction of the vehicle; y, the front and back direction of the vehicle; z, the height direction of the vehicle. DETAILED DESCRIPTION

[0059] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0060] like Figures 1 to 3 As shown, the vehicle provided by the embodiment of the present invention includes a powertrain, a subframe rear cross beam 200, a subframe left longitudinal beam 300, a subframe right longitudinal beam 400 and a front anti-collision beam 500, wherein the subframe left longitudinal beam 300 and the subframe right longitudinal beam 400 are arranged at intervals along the left-right direction x of the vehicle, and the subframe left longitudinal beam 300 is located on the left side of the subframe right longitudinal beam 400, and the subframe rear cross beam 200 is connected between the rear ends of the subframe left longitudinal beam 300 and the rear ends of the subframe right longitudinal beam 400.

[0061] The powertrain includes a vehicle exhaust structure 100, an engine, and an electric hybrid system with a transmission. The electric hybrid system is arranged on the left side of the vehicle and above the left longitudinal beam 300 of the subframe, and the engine is arranged on the right side of the vehicle and above the right longitudinal beam 400 of the subframe.

[0062] The vehicle exhaust structure 100 includes a catalyst 1 and a muffler assembly 2, the muffler assembly 2 includes a first muffler 21 and a second muffler 22, the first muffler 21 is provided with a first inlet and a first outlet, the second muffler 22 is provided with a second inlet and an exhaust outlet 220, the first outlet is connected to the second inlet, the inlet of the catalyst 1 is suitable for being connected to the exhaust pipe of the engine, and the outlet of the catalyst 1 is connected to the first inlet of the first muffler 21.

[0063] The first muffler 21 is disposed above the sub-frame rear cross beam 200 along the height direction z of the vehicle, and the second muffler 22 is disposed between the front bumper beam 500 and the sub-frame rear cross beam 200 along the front-rear direction y of the vehicle.

[0064] The first muffler 21 is used to eliminate noise in a first frequency band, and the second muffler 22 is used to eliminate noise in a second frequency band.

[0065] The vehicle, powertrain, vehicle exhaust structure 100 and muffler assembly 2 provided by the embodiment of the present invention are provided with the first muffler 21 arranged above the rear cross beam 200 of the subframe of the vehicle along the height direction z of the vehicle, and the second muffler 22 arranged between the front anti-collision beam 500 of the vehicle and the rear cross beam 200 of the subframe along the front-rear direction y of the vehicle, so that the exhaust gas discharged by the turbocharger is discharged through the catalyst 1, the first muffler 21 and the second muffler 22 in sequence. The muffler assembly 2 is arranged in the engine compartment of the vehicle and exhausts the exhaust gas from the front side of the vehicle. Since the muffler assembly 2 no longer extends to the rear compartment of the vehicle, the battery arranged on the chassis is not affected by the heat damage of the exhaust heat, which can effectively reduce the risk of heat damage to the whole vehicle, reduce the insulation cost of the whole vehicle, and expand the layout space of important parts such as the battery pack, fuel tank, and rear powertrain, thereby increasing the capacity of the battery pack and fuel tank and improving the cruising range of the whole vehicle.

[0066] In one embodiment, the vehicle exhaust structure 100 also includes a turbocharger, which is connected between the inlet of the catalyst 1 and the exhaust pipe of the engine to achieve communication between the exhaust pipe of the engine and the inlet of the catalyst 1, so that the exhaust gas of the engine enters the catalyst 1.

[0067] In one embodiment, the first frequency band does not overlap with the second frequency band. Specifically, the second frequency band is higher than the first frequency band, so that the first muffler 21 and the second muffler 22 can eliminate noises of different frequency bands.

[0068] In one embodiment, if Figures 1 to 3 As shown, the vehicle exhaust structure 100 further includes a mounting flange 3 , and the catalyst 1 is connected to the exhaust port of the turbocharger via the mounting flange 3 , so that the exhaust gas discharged from the turbocharger can enter the catalyst 1 .

[0069] In one embodiment, if Figures 1 to 3 As shown, the muffler assembly 2 also includes a mounting bracket 4, and the mounting bracket 4 is used to connect the first muffler 21 and the transmission of the electric hybrid system to fix the first muffler 21, ensure the stability of the first muffler 21, and avoid the first muffler 21 from shaking during driving.

[0070] In addition, when there is stress on the first muffler 21 along the height direction z of the vehicle, the first muffler 21 can be supported by the mounting bracket 4 to prevent the first muffler 21 from being deformed.

[0071] In one embodiment, if Figures 1 to 3 As shown, the first muffler 21 is arranged above the transverse stabilizer bar of the front suspension system along the height direction z of the vehicle, so that the first muffler 21 is arranged in the cabin.

[0072] In one embodiment, if Figures 1 to 3 As shown, the second muffler 22 includes a muffler body 221 and an outlet pipe 222. The muffler body 221 is connected between the first muffler 21 and the outlet pipe 222. The muffler body 221 is used to eliminate noise in the second frequency band. The exhaust outlet 220 is arranged on the outlet pipe 222 to form the second muffler 22.

[0073] In one embodiment, if Figures 1 to 3 As shown, the exhaust pipe 222 is located at least one side of the muffler body 221 along the left-right direction x of the vehicle to discharge the exhaust gas from the side of the muffler body 221 .

[0074] In one embodiment, if Figures 1 to 3 As shown, one end of the exhaust pipe 222 is connected to the muffler body 221, and the other end of the exhaust pipe 222 is extended toward the rear and lower part of the vehicle so that the exhaust gas is discharged toward the rear and lower part of the vehicle.

[0075] In one embodiment, if Figures 1 to 3 As shown, the angle between the axis of the air outlet pipe 222 and the front-rear direction y of the vehicle is 55°.

[0076] In one embodiment, if Figures 1 to 3 As shown, two outlet pipes 222 are provided, and the two outlet pipes 222 are respectively provided on opposite sides of the muffler body 221 along the left and right direction x of the vehicle. Each outlet pipe 222 is provided with an exhaust outlet 220, so that the exhaust gas is discharged from both sides of the muffler body 221, and the cabin temperature can also be reduced.

[0077] In one embodiment, if Figures 1 to 3 As shown, the muffler assembly 2 further includes a first connecting bracket 5 and a second connecting bracket 6. The first connecting bracket 5 and the second connecting bracket 6 are respectively installed on opposite sides of the second muffler 22 along the left-right direction x of the vehicle.

[0078] The first connecting bracket 5 is used to connect the front end of the left longitudinal beam 300 of the sub-frame of the vehicle, and the second connecting bracket 6 is used to connect the front end of the right longitudinal beam 400 of the sub-frame of the vehicle.

[0079] The second muffler 22 can be fixed by connecting the first connecting bracket 5 to the left longitudinal beam 300 of the sub-frame and connecting the second connecting bracket 6 to the right longitudinal beam 400 of the sub-frame.

[0080] In one embodiment, if Figures 1 to 3 As shown, the muffler assembly 2 further includes a third muffler 23, and the third muffler 23 is connected between the second muffler 22 and the first muffler 21, and the third muffler 23 is used to eliminate noise in a third frequency band.

[0081] The third muffler 23 is disposed above the sub-frame rear cross member 200 along the height direction z of the vehicle.

[0082] At this time, the vehicle exhaust structure 100 is provided with three mufflers (a first muffler 21, a second muffler 22 and a third muffler 23). The three-stage muffler design can achieve more accurate elimination of noise in each frequency band (a first frequency band, a second frequency band and a third frequency band), and ultimately achieve a better muffler effect. Compared with the existing rear exhaust system, the vehicle exhaust structure 100 provided in the embodiment of the present invention is more compact and has lower cost.

[0083] In one embodiment, the second muffler 22 is disposed below the lateral stabilizer bar of the front suspension and above the rear cross member 200 of the subframe, so that the second muffler 22 is arranged in the cabin.

[0084] In one embodiment, the second frequency band is higher than the third frequency band, and the third frequency band is higher than the first frequency band. Specifically, the first frequency band is 20 Hz-200 Hz, the second frequency band is above 2000 Hz, and the third frequency band is 500 Hz-1500 Hz.

[0085] The vehicle exhaust structure 100 provided in the embodiment of the present invention introduces the gas exhausted by the turbocharger into the catalyst 1, passes through the first muffler 21 to eliminate low-frequency sound (i.e., the first frequency band, 20Hz-200Hz), enters the second muffler 22 to eliminate medium-frequency sound (i.e., the third frequency band, 500Hz-1500Hz), and finally enters the third muffler 23 to eliminate high-frequency sound (i.e., the second frequency band, above 2000Hz) before the exhaust gas is discharged.

[0086] In one embodiment, if Figure 3 As shown, the muffler assembly 2 further includes a mounting lug 7, and the mounting lug 7 is mounted on the third muffler 23. The mounting lug 7 is used to connect the rear cross beam 200 of the subframe to achieve the installation and fixation of the third muffler 23 in the cabin.

[0087] In one embodiment, a rubber ear 201 may be provided below the rear cross beam 200 of the sub-frame. In this case, the mounting ear 7 is used to cooperate with the rubber ear 201 to connect the rear cross beam 200 of the sub-frame, thereby achieving the installation and fixation of the third muffler 23 in the cabin.

[0088] In one embodiment, if Figure 3 As shown, the muffler assembly 2 also includes a first muffler pipe 8, which is connected between the first muffler 21 and the third muffler 23 to achieve communication between the first muffler 21 and the third muffler 23, so that the exhaust gas can enter the third muffler 23 from the first muffler 21.

[0089] In one embodiment, if Figure 3 As shown, the first muffler pipe 8 is integrally formed with the first muffler 21. The muffler assembly 2 further includes a first clamp 9, through which the first muffler pipe 8 is connected to the third muffler 23, thereby achieving connection between the first muffler pipe 8 and the third muffler 23.

[0090] In one embodiment, if Figure 3 As shown, the muffler assembly 2 also includes a second muffler pipe 10, which is connected between the second muffler 22 and the third muffler 23 to achieve communication between the second muffler 22 and the third muffler 23, so that the exhaust gas can enter the second muffler 22 from the third muffler 23.

[0091] In one embodiment, if Figure 3 As shown, the second muffler pipe 10 is integrally formed with the second muffler 22. The muffler assembly 2 further includes a second clamp 11, through which the second muffler pipe 10 is connected to the third muffler 23, thereby achieving connection between the second muffler pipe 10 and the third muffler 23.

[0092] In one embodiment, if Figure 3 As shown, the volume of the muffler chamber of the first muffler 21 is smaller than the volume of the muffler chamber of the third muffler 23, and the volume of the muffler chamber of the third muffler 23 is smaller than the volume of the muffler chamber of the second muffler 22, so that each muffler can eliminate noise of different frequency bands.

[0093] In one embodiment, the volume of the muffler chamber of the first muffler 21 is 15L, the volume of the muffler chamber of the third muffler 23 is 18L, and the volume of the muffler chamber of the second muffler 22 is 31L.

[0094] In one embodiment, the cross section of the first muffler 21 along the height direction z of the vehicle is circular or square. And / or, the cross section of the second muffler 22 along the height direction z of the vehicle is circular or square. And / or, the cross section of the third muffler 23 along the height direction z of the vehicle is circular or square.

[0095] The cross-sections of each muffler are designed to be round and square, which can better optimize the exhaust back pressure (at 850℃ / 5200r / min, the maximum exhaust back pressure can be optimized from 47Kpa to 40~43Kpa) compared to the traditional flat shape, protect the turbocharger, and at the same time ensure the combustion efficiency of the engine, improving the engine power and fuel economy.

[0096] In one embodiment, the vehicle exhaust structure 100 is arranged in a cabin, and the overall exhaust path of the vehicle exhaust structure 100 is quasi-U-shaped.

[0097] In one embodiment, the powertrain also includes a cooling system 600, which is disposed between the front bumper beam 500 and the vehicle exhaust structure 100 along the front-rear direction of the vehicle. The cooling system 600 is used to cool the vehicle exhaust structure 100, the engine and the hybrid system. Since the volume of each muffler is relatively large, the heat dissipation area of ​​the vehicle exhaust structure 100 can be increased.

[0098] In one embodiment, the powertrain further includes a front suspension system, which includes a left front suspension, a right front suspension and a lateral stabilizer bar. The left front suspension is installed at the rear end of a left longitudinal beam 300 of the subframe, and the right front suspension is installed at the rear end of a right longitudinal beam 400 of the subframe. The lateral stabilizer bar is transmission-connected between the left front suspension and the right front suspension.

[0099] In one embodiment, the powertrain further includes a heat shield, which is disposed between the vehicle exhaust structure 100 and the engine, the electric hybrid system and the cooling system 600 to reduce the impact of heat radiation.

[0100] The vehicle exhaust structure 100 provided by the embodiment of the present invention has the following advantages:

[0101] (1) The vehicle exhaust structure 100 is arranged in the engine compartment instead of extending to the rear compartment of the vehicle, which can effectively reduce the risk of heat damage to the whole vehicle and the insulation cost of the whole vehicle. It can also expand the layout space of important parts such as the battery pack, fuel tank, and rear powertrain, so that the position of the battery pack's hanging ears can be extended to the door sill of the vehicle, thereby increasing the number of battery cells in the left and right direction x of the vehicle. According to calculation and evaluation, nearly 30 strings of battery cells can be added, and according to simulation calculation, the pure electric cruising range of the whole vehicle can be increased by 15%. Similarly, according to calculation and evaluation, the volume of the fuel tank can be increased by 5%, so that the cruising range of the whole vehicle can be further improved.

[0102] (2) The vehicle exhaust structure 100 is disposed in the engine compartment, which can not only solve the problem of heat damage, but also provide extra space for arranging a higher-power motor or dual motors to improve the power economy of the entire vehicle.

[0103] (3) The vehicle exhaust structure 100 has a compact structure and can be reasonably arranged in the engine compartment of a hybrid vehicle. After pipeline optimization, it can effectively reduce exhaust back pressure and protect the supercharger.

[0104] The vehicle provided in the embodiment of the present invention includes the powertrain provided in the above embodiment or only includes the vehicle exhaust structure 100 provided in the above embodiment.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention.

Claims

1. A muffler assembly, characterized in that: The muffler assembly comprises a first muffler and a second muffler, the first muffler is provided with a first inlet and a first outlet, the first inlet is suitable for connecting to a catalyst, the second muffler is provided with a second inlet and an exhaust outlet, the first outlet is connected to the second inlet; The first muffler is arranged directly above the rear cross beam of the subframe along the height direction of the vehicle, and the second muffler is arranged between the front anti-collision beam and the rear cross beam of the subframe along the front-rear direction of the vehicle; The muffler assembly further includes a third muffler, which is connected between the second muffler and the first muffler; the third muffler is arranged directly above the rear cross beam of the subframe along the height direction of the vehicle; The second muffler and the exhaust outlet are both arranged on the front side of the third muffler along the front-rear direction of the vehicle.

2. The muffler assembly according to claim 1, characterized in that The first muffler is used to eliminate noise in a first frequency band, and the second muffler is used to eliminate noise in a second frequency band; The first frequency band does not overlap with the second frequency band.

3. The muffler assembly according to claim 2, characterized in that: The second frequency band is higher than the first frequency band.

4. The muffler assembly according to claim 1, characterized in that: The first muffler is arranged above the front suspension system in a height direction of the vehicle.

5. The muffler assembly according to claim 2, characterized in that: The second muffler includes a muffler body and an air outlet pipe, the muffler body is connected between the first muffler and the air outlet pipe, and the muffler body is used to eliminate noise in the second frequency band; The exhaust outlet is arranged on the exhaust pipe.

6. The muffler assembly according to claim 5, characterized in that The air outlet pipe is located on at least one side of the muffler body along the left-right direction of the vehicle.

7. The muffler assembly according to claim 5, characterized in that The two air outlet pipes are provided, and the two air outlet pipes are respectively provided on opposite sides of the muffler body along the left and right directions of the vehicle; Each of the air outlet pipes is provided with an exhaust outlet.

8. The muffler assembly according to claim 6, characterized in that One end of the air outlet pipe is connected to the muffler body, and the other end of the air outlet pipe is extended toward the rear lower part of the vehicle.

9. The muffler assembly according to claim 6, characterized in that The angle between the axis of the air outlet pipe and the front-rear direction of the vehicle is 55°.

10. The muffler assembly according to claim 1, characterized in that The muffler assembly further includes a first connecting bracket and a second connecting bracket, wherein the first connecting bracket and the second connecting bracket are respectively installed on opposite sides of the second muffler along the left-right direction of the vehicle; The first connecting bracket is used to connect the left longitudinal beam of the sub-frame, and the second connecting bracket is used to connect the right longitudinal beam of the sub-frame.

11. The muffler assembly according to claim 2, characterized in that The third muffler is used to eliminate noise in a third frequency band.

12. The muffler assembly according to claim 11, characterized in that The second frequency band is higher than the third frequency band, and the third frequency band is higher than the first frequency band.

13. The muffler assembly according to claim 12, characterized in that The first frequency band is 20 Hz-200 Hz, the second frequency band is above 2000 Hz, and the third frequency band is 500 Hz-1500 Hz.

14. The muffler assembly according to claim 11, characterized in that The muffler assembly further comprises a mounting lug, wherein the mounting lug is mounted on the third muffler; The mounting lug is used to connect the rear cross beam of the subframe.

15. The muffler assembly according to claim 11, characterized in that The muffler assembly further includes a first muffler pipe connected between the first muffler and the third muffler.

16. The muffler assembly according to claim 15, characterized in that The first muffler pipe and the first muffler are integrally formed.

17. The muffler assembly according to claim 11, characterized in that The muffler assembly further includes a second muffler pipe connected between the second muffler and the third muffler.

18. The muffler assembly according to claim 17, characterized in that The second muffler pipe is integrally formed with the second muffler.

19. The muffler assembly according to claim 11, characterized in that The volume of the muffler chamber of the first muffler is smaller than the volume of the muffler chamber of the third muffler, and the volume of the muffler chamber of the third muffler is smaller than the volume of the muffler chamber of the second muffler.

20. The muffler assembly of claim 11, wherein: The cross section of the first muffler along the height direction of the vehicle is circular or square; and / or, the cross section of the second muffler along the height direction of the vehicle is circular or square; And / or, the cross-section of the third muffler along the height direction of the vehicle is circular or square.

21. A vehicle exhaust structure, comprising a catalyst and a muffler assembly according to any one of claims 1 to 20, wherein the first inlet is connected to an outlet of the catalyst, and the inlet of the catalyst is suitable for connecting to an exhaust pipe of an engine.

22. The vehicle exhaust structure according to claim 21, characterized in that: The vehicle exhaust structure further includes a turbocharger connected between the inlet of the catalyst and the exhaust pipe of the engine.

23. A powertrain, characterized in that: It comprises an engine and a vehicle exhaust structure as described in any one of claims 21-22, wherein the engine is arranged above the right longitudinal beam of the subframe along the height direction of the vehicle, and the inlet of the catalyst is connected to the exhaust pipe of the engine.

24. The powertrain according to claim 23, characterized in that: The power assembly further includes an air intake system, which is arranged above the muffler assembly along the height direction of the vehicle and is used to supply air to the engine.

25. The powertrain according to claim 23, characterized in that: The powertrain also includes an electric hybrid system, which is arranged above the left longitudinal beam of the subframe along the height direction of the vehicle.

26. The powertrain according to claim 23, characterized in that: The powertrain also includes a front suspension system, which includes a left front suspension, a right front suspension and a lateral stabilizer bar. The left front suspension is installed at the rear end of the left longitudinal beam of the subframe, the right front suspension is installed at the rear end of the right longitudinal beam of the subframe, and the lateral stabilizer bar is transmission-connected between the left front suspension and the right front suspension.

27. The powertrain according to claim 25, characterized in that: The powertrain also includes a cooling system, which is arranged between the front bumper and the vehicle exhaust structure along the front-rear direction of the vehicle, and is used to cool the vehicle exhaust structure, the engine and the electric hybrid system.

28. A vehicle, characterized in that: A muffler assembly comprising any one of claims 1 to 20, or a vehicle exhaust structure comprising any one of claims 21 to 22, or a powertrain comprising any one of claims 23 to 27.

Images