Silencer assembly and automobile

Abstract

The utility model provides a silencer assembly and an automobile. The silencer assembly comprises a silencer air inlet pipe, a silencer air outlet pipe, a silencer shell and a silencer core pipe. The silencer shell and the battery pack are arranged side by side in the Y direction of the automobile body, the two ends of the silencer shell are connected with the silencer air inlet pipe and the silencer air outlet pipe respectively, the outer diameter of the silencer shell is equal to or smaller than the outer diameter of the silencer air inlet pipe, and / or the outer diameter of the silencer shell is smaller than the outer diameter of the silencer air outlet pipe. The silencer core pipe is arranged in the silencer shell in an inserted mode, the two ends of the silencer core pipe are connected with the two ends of the silencer shell respectively, an expansion cavity is formed between the silencer core pipe and the silencer shell, a plurality of through holes are formed in the silencer core pipe, and the expansion cavity is filled with a silencing component. According to the silencer assembly and the automobile provided by the invention, the occupation of Y-direction space can be reduced, so that the Y-direction size design of the battery pack can meet user requirements.

Description

Technical Field

[0001] The present application belongs to the technical field of automobile mufflers, and in particular relates to a muffler assembly and an automobile. Background Art

[0002] Hybrid vehicles have become a development trend for various car companies in the current environment, and a major selling point of hybrid vehicles is the pure electric range, that is, the longest distance that can be traveled using battery kinetic energy under comprehensive working conditions.

[0003] In the prior art, the battery capacity is usually increased by increasing the size of the battery pack to extend the pure electric range of the car.

[0004] The inventors have discovered that the relevant components of the automobile exhaust system will limit the increase in the Y-direction size of the battery pack. Specifically, the muffler of the automobile exhaust system is usually fixed next to the battery pack to ensure that the muffler can reduce the medium and high frequency noise of the exhaust system and interrupt the standing waves in the long pipeline; however, the fixed position of the battery pack will interfere with the arrangement of the battery pack, especially the outer shell that is arranged in parallel with the battery pack along the Y-direction and protrudes from the air inlet and outlet pipes, which will have a direct impact on the size design of the battery pack. Utility Model Content

[0005] The embodiments of the present application provide a muffler assembly and a vehicle, which are intended to ensure that the muffler can reduce the medium and high frequency noise of the exhaust system and interrupt the standing waves in the long pipeline, while also reducing the occupation of the Y-direction space to ensure that the Y-direction dimension design of the battery pack can meet user needs.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] A muffler assembly is provided, comprising a muffler air inlet pipe and a muffler air outlet pipe respectively arranged on both sides of a battery pack along the X direction of a vehicle body, and the muffler assembly further comprises:

[0008] A muffler shell is arranged in parallel with the battery pack along the Y direction of the vehicle body, and the two ends of the muffler shell are respectively connected to the muffler air inlet pipe and the muffler air outlet pipe; wherein the outer diameter of the muffler shell is equal to or smaller than the outer diameter of the muffler air inlet pipe, and / or the outer diameter of the muffler shell is equal to or smaller than the outer diameter of the muffler air outlet pipe; and

[0009] The muffler core tube is inserted into the interior of the muffler shell, and the two ends of the muffler core tube are respectively connected to the two ends of the muffler shell; an expansion cavity is provided between the muffler core tube and the muffler shell, and the muffler core tube is provided with a plurality of through holes connected to the expansion cavity, and the expansion cavity is filled with a silencer component.

[0010] In a possible implementation, the muffler core pipe includes:

[0011] A core pipe body is inserted and arranged inside the muffler shell, and each of the through holes is opened on the core pipe body; and

[0012] Two overlapping parts are respectively connected to the two ends of the core tube body, and the outer diameter of each overlapping part gradually increases in the direction away from the core tube body;

[0013] Among them, the outer diameter of the core tube body is smaller than the inner diameter of the muffler shell, and the outer diameter of the overlap portion facing away from the core tube body is equal to the inner diameter of the muffler shell, so that the overlap portion is connected to the inner circumferential wall of the muffler shell to form the expansion cavity.

[0014] In a possible implementation, each of the overlapping portions further includes:

[0015] The straight tube portion is arranged at one end of the overlap portion facing away from the core tube body, the straight tube portion extends in a direction facing away from the overlap portion, and the outer peripheral wall of the straight tube portion is connected to the inner peripheral wall of the core tube body.

[0016] In a possible implementation, the extending end of each straight tube portion overlaps with the end of the core tube body.

[0017] In a possible implementation, a plurality of guide structures spaced apart along the circumferential direction are provided on the inner circumferential wall of the overlap portion, and the guide structures are inwardly concave strip grooves or outwardly convex strips.

[0018] In a possible implementation, the silencer component is tubular silencer cotton that is sleeved on the muffler core tube, and the outer circumferential wall of the silencer cotton is connected to the inner circumferential wall of the muffler shell.

[0019] In a possible implementation, the muffler shell adopts an internally hollow cylindrical structure, and the outer diameter of the muffler shell, the outer diameter of the muffler inlet pipe, and the outer diameter of the muffler outlet pipe are equal to each other;

[0020] The end surfaces at both ends of the muffler shell are respectively connected to the end surfaces of the muffler air inlet pipe and the muffler air outlet pipe.

[0021] In one possible implementation, the muffler shell adopts an internal hollow cylindrical structure, the outer diameter of the muffler air inlet pipe is smaller than the inner diameter of the muffler air outlet pipe, and the muffler air inlet pipe is plugged into the interior of the muffler shell, and the muffler shell is plugged into the interior of the muffler air outlet pipe.

[0022] In a possible implementation, the outer diameter of the muffler air inlet pipe is equal to the inner diameter of the muffler core pipe, and the muffler air inlet pipe is also plugged into the interior of the muffler core pipe.

[0023] In the embodiment of the present application, the muffler shell and the muffler core tube cooperate to form a main structure that can reduce the medium and high frequency noise of the exhaust system and interrupt the standing waves in the long pipeline; on this basis, since the outer diameter of the muffler shell is equal to or smaller than the outer diameter of the muffler inlet pipe, and / or the outer diameter of the muffler shell is equal to or smaller than the outer diameter of the muffler outlet pipe, the Y-direction space occupied by the muffler shell (compared with the conventional structure) is smaller, thereby avoiding the extension space of the battery pack along the Y-direction of the vehicle body, so that the battery pack has a stronger expansion capacity.

[0024] Compared with the prior art, the muffler assembly provided in this embodiment can reduce the Y-direction space occupied while ensuring that the muffler can reduce the medium and high frequency noise of the exhaust system and interrupt the standing waves in long pipes, so as to ensure that the Y-direction dimension design of the battery pack can meet user needs.

[0025] The technical solution adopted in the present application also provides a car, comprising the muffler assembly proposed in any of the aforementioned items.

[0026] The beneficial effects of the automobile provided by this embodiment are the same as the beneficial effects of the aforementioned muffler assembly, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a muffler assembly provided in an embodiment of the present application;

[0029] Figure 2 For along Figure 1 The cross-sectional structure diagram along the AA line;

[0030] Figure 3 A partially enlarged schematic diagram of a muffler housing and a muffler intake pipe used in an embodiment of the present application in a cross-sectional perspective;

[0031] Figure 4 A partially enlarged schematic diagram of a muffler housing and a muffler outlet pipe used in an embodiment of the present application in a cross-sectional perspective;

[0032] Explanation of the reference numerals: 1. silencer shell; 2. silencer core tube; 21. core tube body; 211. through hole; 22. overlapping portion; 221. straight tube portion; 222. guide structure; 3. silencer component; 10. silencer air inlet pipe; 20. silencer air outlet pipe. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application 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 application and are not used to limit the present application.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In addition, for the sake of convenience of description, in this embodiment, the width direction of the vehicle body (i.e., the arrangement direction of the main driver's seat and the co-driver's seat) is pre-defined as the Y direction of the vehicle body, the length direction of the vehicle body (i.e., the arrangement direction of the front and the rear of the vehicle) is the X direction of the vehicle body, and the height direction of the vehicle body (i.e., the arrangement direction of the bottom and the roof of the vehicle) is pre-defined as the Z direction of the vehicle body.

[0038] Please also read Figures 1 to 4 The muffler assembly provided in the present application is now described. The muffler assembly provided in the present application comprises a muffler air inlet pipe 10, a muffler air outlet pipe 20, a muffler housing 1 and a muffler core pipe 2.

[0039] The muffler air inlet pipe 10 and the muffler air outlet pipe 20 are both arranged on the front floor of the car and on both sides of the battery pack along the X direction of the car body, and the rear end of the muffler air inlet pipe 10 and the front end of the muffler air outlet pipe 20 are coaxially arranged, and there is an installation gap between the muffler air inlet pipe 10 and the muffler air outlet pipe 20, and the installation gap is between the battery pack and the door sill beam.

[0040] The muffler shell 1 is fixedly arranged on the front floor of the car and is located in the aforementioned installation gap, that is, it is arranged in parallel with the battery pack along the Y direction of the car body; the muffler shell 1 has a hollow cavity with open ends, and the front and rear ends of the muffler shell 1 are respectively connected to the rear end of the muffler inlet pipe 10 and the front end of the muffler outlet pipe 20, and the specific connection method is usually welding.

[0041] In this embodiment, the outer diameter of the muffler housing 1 is equal to or smaller than the outer diameter of the muffler inlet pipe 10, and / or the outer diameter of the muffler housing 1 is equal to or smaller than the outer diameter of the muffler outlet pipe 20; that is, the outer diameter design of the muffler housing 1 has four situations, specifically:

[0042] First, the outer diameter of the muffler housing 1, the outer diameter of the muffler inlet pipe 10 and the outer diameter of the muffler outlet pipe 20 are equal to each other;

[0043] Second, the outer diameter of the muffler housing 1 is equal to the outer diameter of the muffler inlet pipe 10, and the outer diameter of the muffler housing 1 is smaller than the outer diameter of the muffler outlet pipe 20;

[0044] Third, the outer diameter of the muffler housing 1 is smaller than the outer diameter of the muffler inlet pipe 10, and the outer diameter of the muffler housing 1 is equal to the outer diameter of the muffler outlet pipe 20;

[0045] Fourthly, the outer diameter of the muffler housing 1 is smaller than the outer diameter of the muffler air inlet pipe 10 , and the outer diameter of the muffler housing 1 is smaller than the outer diameter of the muffler air outlet pipe 20 .

[0046] Regardless of the situation, the outer edge of the muffler shell 1 will not exceed the outer edge of the muffler inlet pipe 10 and the outer edge of the muffler outlet pipe 20, that is, the outer diameter of the muffler shell 1 is limited by the muffler inlet pipe 10 and the muffler outlet pipe 20, thereby effectively avoiding the Y-direction expansion space of the battery pack.

[0047] In actual situations, the muffler shell 1 with this structural size can effectively adjust the spacing between components. Specifically, the gap between the muffler shell 1 and the battery pack is increased from 53mm to 96mm, that is, the battery pack can be extended by at least 53mm along the Y direction of the vehicle body; similarly, the gap between the muffler shell 1 and the front floor is increased from 35mm to 56mm, and the gap between the muffler assembly package and the door sill beam is increased from 59mm to 61mm.

[0048] The muffler core tube 2 is coaxially plugged into the hollow cavity of the muffler shell 1, and the front and rear ends of the muffler core tube 2 are respectively connected to the front and rear ends of the muffler shell 1; the specific connection method is usually welding, and the welding point is located in the gap between the muffler core tube 2 and the muffler shell 1. There is an expansion cavity between the muffler core tube 2 and the muffler shell 1, specifically: the outer peripheral wall of the muffler core tube 2 adopts a concave structure, and / or the inner peripheral wall of the muffler shell 1 adopts a concave structure to form the aforementioned expansion cavity. On this basis, a plurality of through holes 211 connected to the expansion cavity are also provided on the muffler core tube 2, and the expansion cavity is filled with a silencer component 3 to achieve the effect of reducing the medium and high frequency noise of the exhaust system and interrupting the standing wave of the long pipeline.

[0049] It should be noted that the expansion chamber formed by the structure proposed in the embodiment of the present application has the same volume as the expansion chamber in the conventional structure; accordingly, the number and arrangement of the through holes 211, as well as the silencer component 3 are also the same. Therefore, the combined structure of the silencer core tube 2 and the silencer shell 1 proposed in the embodiment of the present application can achieve the same silencer effect (compared with the silencer element in the conventional structure).

[0050] In the embodiment of the present application, the muffler shell 1 and the muffler core tube 2 cooperate to form a main structure that can reduce the medium and high frequency noise of the exhaust system and interrupt the standing waves in the long pipeline; on this basis, since the outer diameter of the muffler shell 1 is equal to or smaller than the outer diameter of the muffler inlet pipe 10, and / or the outer diameter of the muffler shell 1 is equal to or smaller than the outer diameter of the muffler outlet pipe 20, the Y-direction space occupied by the muffler shell 1 (compared with the conventional structure) is smaller, thereby avoiding the extension space of the battery pack along the Y-direction of the vehicle body, so that the battery pack has a stronger expansion capacity.

[0051] Compared with the prior art, the muffler provided in this embodiment can reduce the Y-direction space occupied while ensuring that the muffler can reduce the medium and high frequency noise of the exhaust system and interrupt the standing waves in long pipes, so as to ensure that the Y-direction dimension design of the battery pack can meet user needs.

[0052] In some embodiments, Figure 3 and Figure 4 As shown, the muffler core pipe 2 includes a core pipe body 21 and two overlapping portions 22 .

[0053] The core tube body 21 is inserted into the hollow cavity of the muffler shell 1, and each of the aforementioned through holes 211 is opened on the core tube body 21 and communicated with the inner cavity of the core tube body 21; in this embodiment, the outer diameter of the core tube body 21 is smaller than the inner diameter of the muffler shell 1 to form an annular space between the core tube body 21 and the muffler shell 1.

[0054] The two overlapping parts 22 are respectively connected to the two ends of the core tube body 21, and the outer diameter of each overlapping part 22 gradually increases in the direction away from the core tube body 21, and the outer diameter of the overlapping part 22 at one end away from the core tube body 21 is equal to the inner diameter of the muffler shell 1, so that the overlapping part 22 is connected to the inner circumferential wall of the muffler shell 1 to form the aforementioned expansion cavity for accommodating the silencer component 3.

[0055] Compared with the concave structure, the wall thickness of the core tube body 21 and the overlapping portion 22 are equal to obtain better product structural strength.

[0056] In some embodiments, Figure 3 and Figure 4 As shown, each lap joint 22 also includes a straight tube portion 221 with a cylindrical structure. The straight tube portion 221 is integrally connected to one end of the lap joint 22 facing away from the core tube body 21, and serves to extend the lap joint 22. Specifically, the straight tube portion 221 extends in a direction away from the lap joint 22, and the outer peripheral wall of the straight tube portion 221 is connected to the inner peripheral wall of the core tube body 21.

[0057] By adopting the above technical solution, the straight tube portion 221 can effectively increase the contact area between the overlapping portion 22 and the core tube body 21, so that when the overlapping portion 22 and the core tube body 21 are connected by welding or other means, the structural strength of the body can be effectively improved.

[0058] In some embodiments, Figure 3 and Figure 4 As shown, the extended end of each straight tube portion 221 overlaps with the end of the core tube body 21, so that a double-layer welding structure is formed between the straight tube portion 221 and the core tube body 21, thereby achieving structural combination while improving the structural strength of the end of the core tube body 21.

[0059] In some embodiments, Figure 3 and Figure 4 As shown, a plurality of guide structures 222 are arranged on the inner wall of the overlap portion 22 at intervals along the circumferential direction, and the guide structure 222 is an inwardly concave strip groove or an outwardly convex strip. Specifically, the guide structure 222 targets the sound medium that passes through the muffler inlet pipe 10 and is about to enter the core tube body 21, and the sound structure that passes through the core tube body 21 and is about to enter the muffler outlet pipe 20, which plays a role in reducing the influence of medium propagation stress and optimizing the medium propagation path.

[0060] Wherein, when the guide structure 222 is a strip groove, the strip groove extends along the inclined surface of the overlap portion 22, and the two ends of the strip groove coincide with the connection between the overlap portion 22 and the core tube body 21, and the connection between the overlap portion 22 and the straight tube portion 221 (when there is no straight tube portion 221, the end of the strip groove and the outer edge of the overlap portion 22), and the depth of the strip groove gradually decreases along the propagation direction of the sound medium. When the guide structure 222 is a lath, the lath is usually fixed to the overlap portion 22 by welding, and extends along the inclined surface of the overlap portion 22, and the thickness of the lath gradually decreases along the propagation direction of the sound medium.

[0061] It should be noted that, compared with the strip grooves, the processing of the slats is simpler; however, compared with the slats, the strip grooves not only occupy less internal space of the overlap portion 22, but also expand the trajectory area of ​​the medium propagation to a certain extent, so that this product has better medium propagation characteristics.

[0062] In some embodiments, Figure 2 As shown, the silencer component 3 is a tubular silencer cotton sleeved on the silencer core tube 2, and the outer peripheral wall of the silencer cotton is connected to the inner peripheral wall of the silencer shell 1.

[0063] Based on this, in the preparation process of this product, it is necessary to first wrap the silencer cotton on the muffler core tube 2, and then insert the muffler core tube 2 into the muffler shell 1.

[0064] In some embodiments, Figure 2 As shown, the silencer component 3 is a tubular silencer cotton which is sleeved on the core tube body 21 and is located between the two overlapping parts 22, and the outer peripheral wall of the silencer cotton is connected to the inner peripheral wall of the muffler shell 1 to limit the position of the silencer cotton and avoid the movement of the silencer cotton to reduce the silencer effect of the silencer component 3.

[0065] Based on this, during the preparation of this product, it is necessary to first wrap the silencer cotton on the core tube body 21 , and then insert the core tube body 21 into the muffler shell 1 so that the two overlapping parts 22 are both inside the muffler shell 1 .

[0066] In some embodiments, the muffler housing 1 has a hollow cylindrical structure, and the outer diameters of the muffler housing 1 , the muffler air inlet pipe 10 , and the muffler air outlet pipe 20 are equal to each other.

[0067] Based on this, the end faces at both ends of the muffler shell 1 are respectively connected to the end faces of the muffler inlet pipe 10 and the muffler outlet pipe 20 to form a tube body structure with no protrusions on the surface, thereby optimizing the product appearance and effectively avoiding the expansion space of the battery pack along the Y direction of the vehicle body.

[0068] However, when the structure proposed in the above embodiment is adopted, the contact area between the two end surfaces is too small, resulting in a technical problem of low strength of the product combination structure. In order to solve this problem, in some embodiments, such as Figure 3 and Figure 4 As shown, the muffler housing 1 adopts an internal hollow columnar structure, the outer diameter of the muffler air inlet pipe 10 is smaller than the inner diameter of the muffler air outlet pipe 20, the inner diameter of the muffler air inlet pipe 10 is equal to or greater than the outer diameter of the muffler air inlet pipe 10, and the outer diameter of the muffler air inlet pipe 10 is less than or equal to the inner diameter of the muffler air outlet pipe 20.

[0069] Based on this, the muffler air inlet pipe 10 is inserted into the interior of the muffler shell 1, and the muffler shell 1 is inserted into the interior of the muffler air outlet pipe 20, and a sealed connection structure (welding is preferred) is adopted between the outer peripheral wall of the muffler air inlet pipe 10 and the muffler shell 1, and between the outer peripheral wall of the muffler shell 1 and the inner peripheral wall of the muffler air outlet pipe 20 to ensure the muffler effect of this product.

[0070] It should be noted that, compared with the technical solution of "the muffler shell 1 is plugged into the inside of the muffler air inlet pipe 10, and the muffler air outlet pipe 20 is plugged into the inside of the muffler shell 1", plugging the muffler air inlet pipe 10 into the inside of the muffler shell 1 can effectively avoid the pushing effect of the sound medium (gas) on the muffler shell 1 during the propagation process, and plugging the muffler shell 1 into the inside of the muffler air outlet pipe 20 can effectively avoid the pushing effect of the sound medium on the muffler air outlet pipe 20 during the propagation process, avoid the loosening of the matching relationship between the various pipe joints, and ensure the structural strength of this product and the stability during use.

[0071] By adopting the above technical solution, when combining the muffler shell 1, the muffler air inlet pipe 10 and the muffler air outlet pipe 20, first adjust the position of the muffler shell 1 so that the muffler air inlet pipe 10 is inserted from the front end of the muffler shell 1, then insert the muffler air outlet pipe 20 into the rear end of the muffler shell 1, and finally fix the muffler air outlet pipe 20 to achieve the preparation combination of the product.

[0072] In some embodiments, Figure 3 and Figure 4 As shown, the outer diameter of the muffler air inlet pipe 10 is equal to the inner diameter of the muffler core pipe 2 to ensure the stable connection between the muffler air inlet pipe 10 and the muffler core pipe 2; at the same time, the muffler air inlet pipe 10 is also plugged into the inside of the muffler core pipe 2 to achieve the technical purpose of plugging the muffler air inlet pipe 10 into the muffler shell 1 and ensure sufficient contact between the muffler air inlet pipe 10 and the muffler shell 1.

[0073] Based on the same inventive concept, an embodiment of the present application also provides an automobile, comprising a muffler assembly as proposed in any of the aforementioned items.

[0074] The beneficial effects of the automobile provided by this embodiment are the same as the beneficial effects of the aforementioned muffler assembly, and will not be repeated here.

[0075] The above content is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A muffler assembly, comprising a muffler air inlet pipe (10) and a muffler air outlet pipe (20) respectively arranged on both sides of a battery pack along the X direction of a vehicle body, characterized in that: The muffler assembly also includes: A muffler shell (1) is arranged in parallel with the battery pack along the Y direction of the vehicle body, and two ends of the muffler shell (1) are respectively connected to the muffler air inlet pipe (10) and the muffler air outlet pipe (20); wherein the outer diameter of the muffler shell (1) is equal to or smaller than the outer diameter of the muffler air inlet pipe (10), and / or the outer diameter of the muffler shell (1) is equal to or smaller than the outer diameter of the muffler air outlet pipe (20); and A muffler core tube (2) is inserted and arranged inside the muffler shell (1), and two ends of the muffler core tube (2) are respectively connected to two ends of the muffler shell (1); an expansion cavity is provided between the muffler core tube (2) and the muffler shell (1), a plurality of through holes (211) connected to the expansion cavity are provided on the muffler core tube (2), and the expansion cavity is filled with a muffler component (3).

2. The muffler assembly according to claim 1, characterized in that: The muffler core tube (2) comprises: A core tube body (21) is inserted and arranged inside the muffler housing (1), and each of the through holes (211) is provided on the core tube body (21); and Two overlapping portions (22) are respectively connected to two ends of the core tube body (21), and the outer diameter of each overlapping portion (22) gradually increases in a direction away from the core tube body (21); The outer diameter of the core tube body (21) is smaller than the inner diameter of the muffler shell (1), and the outer diameter of the end of the overlap portion (22) facing away from the core tube body (21) is equal to the inner diameter of the muffler shell (1), so that the overlap portion (22) is connected to the inner peripheral wall of the muffler shell (1) to form the expansion cavity.

3. The muffler assembly according to claim 2, characterized in that: Each of the overlapping portions (22) further comprises: The straight tube portion (221) is arranged at one end of the overlapping portion (22) facing away from the core tube body (21); the straight tube portion (221) extends in a direction facing away from the overlapping portion (22); and the outer peripheral wall of the straight tube portion (221) is connected to the inner peripheral wall of the core tube body (21).

4. The muffler assembly according to claim 3, characterized in that: The extended end of each straight tube portion (221) overlaps with the end of the core tube body (21).

5. The muffler assembly according to claim 3, characterized in that: A plurality of groups of guide structures (222) are arranged at intervals along the circumferential direction on the inner peripheral wall of the overlapped portion (22), and the guide structures (222) are inwardly concave strip grooves or outwardly convex strips.

6. The muffler assembly according to claim 1, characterized in that: The silencer component (3) is tubular silencer cotton which is sleeved on the silencer core tube (2), and the outer peripheral wall of the silencer cotton is connected to the inner peripheral wall of the silencer shell (1).

7. The muffler assembly according to any one of claims 1 to 6, characterized in that: The muffler shell (1) adopts an internally hollow columnar structure, and the outer diameter of the muffler shell (1), the outer diameter of the muffler air inlet pipe (10), and the outer diameter of the muffler air outlet pipe (20) are equal to each other; The end surfaces at both ends of the muffler housing (1) are respectively connected to the end surfaces of the muffler air inlet pipe (10) and the muffler air outlet pipe (20).

8. The muffler assembly according to any one of claims 1 to 6, characterized in that: The muffler shell (1) adopts an internally hollow columnar structure, the outer diameter of the muffler air inlet pipe (10) is smaller than the inner diameter of the muffler air outlet pipe (20), and the muffler air inlet pipe (10) is plugged into the interior of the muffler shell (1), and the muffler shell (1) is plugged into the interior of the muffler air outlet pipe (20).

9. The muffler assembly according to claim 8, characterized in that: The outer diameter of the muffler air inlet pipe (10) is equal to the inner diameter of the muffler core pipe (2), and the muffler air inlet pipe (10) is also plugged into the interior of the muffler core pipe (2).

10. An automobile, characterized in that A muffler assembly comprising any one of claims 1-9.

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