CN218862708U - Silencer of automobile exhaust system - Google Patents

Abstract

The application discloses car exhaust system silencer includes silencer casing and silencer inner core. The silencer shell comprises a silencer inner shell, a silencer outer shell and silencer heat insulation cotton, wherein the silencer heat insulation cotton is located between the silencer inner shell and the silencer outer shell. Through adding thermal-insulated cotton in to the casing for this exhaust system silencer need not additionally to be equipped with heat-proof device for the silencer, has reduced the development to thermal-insulated part, has saved the interior space of car, has also reduced the quality of whole car simultaneously.

Description

Silencer of automobile exhaust system

Technical Field

The utility model relates to a silencer technical field, in particular to automobile exhaust system silencer.

Background

With the improvement of living standard, people have higher requirements on the comfort when riding the vehicle. NVH (Noise, vibration, harshness) of the whole vehicle is an important index for measuring the riding comfort of the vehicle, and based on the important index, researchers further find that improving the Noise of air intake and exhaust of an engine is the most critical content for improving the comfort of the whole vehicle.

Specifically, the engine can bring noise to the tail of the vehicle while discharging exhaust gas, and in order to control the exhaust noise, a muffler is usually disposed at the tail end of the exhaust pipe, and is mainly used for reducing the exhaust noise, reducing the energy of the exhaust gas flow, and balancing the pressure fluctuation of the gas flow, so as to achieve the effect of reducing the exhaust noise or restricting the exhaust noise value within a specific range. Exhaust system mufflers are currently provided in most vehicles.

In the process of implementing the present application, designers find that the prior art has at least the following problems:

when the exhaust system muffler is installed, in order to keep the temperature of the whole vehicle in a stable state, a heat insulation plate needs to be additionally installed or a heat insulation cover needs to be additionally arranged outside the muffler shell. The heat insulation plate or the heat insulation cover can increase the weight of the whole vehicle; in addition, with the increasing of vehicle model configurations, corresponding components, such as a power battery pack, a main reducer and the like, need to be added into the vehicle, and the components greatly compress the arrangement space of the exhaust system muffler, so that the installation design and arrangement of the exhaust system muffler are more and more difficult.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides an exhaust system muffler, which has a heat insulation function, so that it is not necessary to additionally provide a heat insulation device for the muffler, thereby saving the space inside the vehicle and reducing the weight of the entire vehicle.

Specifically, the method comprises the following technical scheme:

there is provided an exhaust system muffler for an automobile, the exhaust system muffler comprising: a muffler inner core and a muffler shell;

the silencer shell is of a hollow cylindrical structure, and the silencer inner core is positioned inside the silencer shell;

the silencer shell comprises a silencer inner shell, a silencer outer shell and silencer heat insulation cotton, wherein the silencer heat insulation cotton is located between the silencer inner shell and the silencer outer shell.

In one possible implementation, the muffler includes a pre-muffler;

the muffler inner core comprises a pre-muffler inner core, the muffler inner shell comprises a pre-muffler inner shell, the muffler outer shell comprises a pre-muffler outer shell, and the muffler heat insulation cotton comprises pre-muffler heat insulation cotton;

the front silencer inner shell, the front silencer heat insulation cotton and the front silencer outer shell form a front silencer shell together;

the pre-muffler includes the pre-muffler inner core and the pre-muffler shell.

In one possible implementation, the muffler further comprises a rear muffler;

the muffler inner core comprises a rear muffler inner core, the muffler inner shell comprises a rear muffler inner shell, the muffler outer shell comprises a rear muffler outer shell, and the muffler heat insulation cotton comprises rear muffler heat insulation cotton;

the rear silencer inner shell, the rear silencer heat insulation cotton and the rear silencer outer shell jointly form a rear silencer shell;

the rear muffler includes the rear muffler inner core and the rear muffler shell.

In one possible implementation manner, the pre-muffler further comprises a front end cover of the pre-muffler and a rear end cover of the pre-muffler, and the rear muffler further comprises a front end cover of the rear muffler and a rear end cover of the rear muffler;

the front end cover of the pre-silencer and the rear end cover of the pre-silencer respectively cover two bottom surfaces of the cylindrical structure of the front silencer shell, so that the front silencer shell, the front end cover of the pre-silencer and the rear end cover of the pre-silencer jointly enclose a pre-silencer cavity, and the inner core of the pre-silencer is arranged in the pre-silencer cavity;

the rear silencer front end cover and the rear silencer rear end cover respectively cover two bottom surfaces of the cylindrical structure of the rear silencer shell, so that the rear silencer shell, the rear silencer front end cover and the rear silencer rear end cover jointly enclose a rear silencer cavity, and the rear silencer inner core is arranged inside the rear silencer cavity.

In one possible implementation manner, the pre-silencer inner core comprises a pre-silencer air inlet pipe and a pre-silencer air outlet pipe, and the pre-silencer air inlet pipe and the pre-silencer air outlet pipe are both hollow straight pipes;

the centers of the two pre-silencer end covers are respectively provided with a through hole, and the pre-silencer air inlet pipe and the pre-silencer air outlet pipe are inserted into the pre-silencer cavity along the direction vertical to the plane where the pre-silencer end covers are located;

the center of the front end cover of the pre-silencer is provided with a first through hole, the air inlet of the air inlet pipe of the pre-silencer penetrates out of the first through hole of the front end cover of the pre-silencer and is arranged on the outer side of the shell of the pre-silencer, and the air outlet of the air inlet pipe of the pre-silencer is positioned in the cavity of the pre-silencer;

the center of the front silencer rear end cover is provided with a second through hole, the air outlet of the front silencer air outlet pipe penetrates out of the second through hole of the front silencer rear end cover and is arranged on the outer side of the front silencer shell, and the air inlet of the front silencer air outlet pipe is located in the front silencer cavity.

In one possible implementation, the rear muffler inner core includes a rear muffler inlet pipe;

a third through hole is formed in the side wall of the rear silencer shell, an air inlet of the rear silencer air inlet pipe penetrates out of the third through hole and is arranged on the outer side of the rear silencer shell, and an air outlet of the rear silencer air inlet pipe is located in the rear silencer cavity;

and a fourth through hole is formed in any one end cover of the rear silencer and used for installing a gas discharge pipe.

In one possible implementation, the exhaust system muffler further includes a first connection pipe, a second connection pipe, and a gas exhaust pipe;

wherein one end of the first connecting pipe is connected with an internal combustion engine of a vehicle for guiding exhaust gas flow generated by the internal combustion engine into the exhaust system muffler, and the other end of the first connecting pipe is connected with an air inlet of an air inlet pipe of the pre-muffler;

one end of the second connecting pipe is connected with the air outlet of the air outlet pipe of the front silencer, and the other end of the second connecting pipe is connected with the air inlet of the air inlet pipe of the rear silencer;

and a fourth through hole is formed in the end cover of any one of the two rear mufflers and used for installing the gas discharge pipe, and the gas discharge pipe is used for discharging waste gas passing through the rear muffler.

In one possible implementation, the exhaust system muffler further includes a first hook assembly, a second hook assembly, a third hook assembly, and a fourth hook assembly;

the first lifting hook assembly and the second lifting hook assembly are arranged on the second connecting pipe at intervals and are fixedly connected with the second connecting pipe;

and the third lifting hook assembly and the fourth lifting hook assembly are respectively and fixedly connected with the two rear silencer end covers.

In one possible implementation, the muffler inner shell and the muffler outer shell are closely attached to the muffler insulation wool between the muffler inner shell and the muffler outer shell, respectively.

In one possible implementation, the rear muffler inner core includes two first partitions;

the two first partition plates are arranged in the front silencer cavity at intervals, the front silencer cavity is divided into three parallel cavities, and planes where the two first partition plates are located are parallel to planes where the front silencer end covers are located.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

the muffler is added into a shell of the muffler, and the heat insulation cotton has the effects of absorbing noise of the exhaust system and insulating heat, so that a heat insulation device does not need to be additionally arranged on the muffler, the development of heat insulation parts is reduced, more space is vacated for the interior of a vehicle, and the quality of the whole vehicle is reduced; meanwhile, the influence of the heat of the exhaust system on peripheral parts can be reduced, and the service life of the peripheral parts is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a partial structure of a muffler of an exhaust system according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a pre-muffler according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a rear muffler according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a muffler assembly of an exhaust system according to an embodiment of the present disclosure.

The reference numerals in the drawings denote:

1-an inner core of a silencer; 2-a muffler shell; 3-inner shell of silencer; 4-a muffler shell; 5-silencer heat insulation cotton; 6-an inner core of the pre-silencer; 7-a pre-muffler inner shell; 8-a pre-muffler shell; 9-pre-silencer heat insulation cotton; 10-a pre-muffler shell; 11-a pre-muffler; 12-a rear muffler; 13-rear muffler inner core; 14-rear muffler inner shell; 15-rear muffler shell; 16-rear muffler insulation cotton; 17-rear muffler shell; 18-front muffler front end cover; 19-front muffler rear end cover; 20-front end cover of back silencer; 21-rear muffler end cover; 22-a pre-muffler inlet pipe; 23-a front silencer air outlet pipe; 24-a first via; 25-the air inlet of the air inlet pipe of the pre-silencer; 26-an air outlet of an air inlet pipe of the pre-silencer; 27-air inlet of air outlet pipe of fore-muffler; 28-the air outlet of the air outlet pipe of the pre-silencer; 29-a second via; 30-rear muffler inlet pipe; 31-the inlet of the rear muffler inlet pipe; 32-a third via; 33-the air outlet of the air inlet pipe of the rear silencer; 34-a fourth through hole; 35-a first connection pipe; 36-a second connecting tube; 37-gas discharge pipe; 38-a first hook assembly; 39-a second hook assembly; 40-a third hook assembly; 41-a fourth hook assembly; 42-a first separator; 43-a flange; 44-a second separator; 45-inner tube.

Specific embodiments of the present application have been shown by way of example in the drawings and will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Before the embodiments of the present application are described in further detail, terms of orientation such as "upper", "lower" and "side" in the embodiments of the present application are used only for clearly describing the relationship between structures and structures with reference to the orientation shown in fig. 1, and are not intended to describe an absolute orientation. When the product is placed in different postures, the orientation may be changed, for example, "up" and "down" may be interchanged.

Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art. Before further detailed description of the embodiments of the application, some terms used in understanding the examples of the application are explained.

In order to make the technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic partial structural diagram of an exhaust system muffler according to an embodiment of the present disclosure. Referring to fig. 1, the present application provides a muffler including a muffler core 1 and a muffler shell 2.

The silencer inner core 1 is used for silencing and reducing noise of exhaust gas flow generated by an internal combustion engine, the silencer shell 2 is used for wrapping the silencer inner core 1, the silencer inner core 1 is composed of hollow straight pipes and partition plates, and the pipes and the partition plates form silencing units such as an expansion chamber and a resonance chamber in the silencer shell, so that sound waves are reflected and interfered when passing through the silencing units, and sound energy is reduced to achieve silencing and noise reducing effects.

As can also be seen from fig. 1, the muffler shell 2 is a hollow cylindrical structure, and the muffler inner core 1 is located inside the muffler shell 2; the silencer casing 2 comprises a silencer inner shell 3, a silencer outer shell 4 and silencer heat insulation cotton 5, wherein the silencer heat insulation cotton 5 is positioned between the silencer inner shell 3 and the silencer outer shell 4.

Based on this, because the muffler heat insulation cotton is added into the shell of the muffler of the exhaust system provided by the application, and the heat insulation cotton has the functions of absorbing the noise of the exhaust system and insulating heat, a heat insulation device is not required to be additionally arranged on the muffler, so that the development of heat insulation parts is reduced, more space is vacated for the interior of a vehicle, and the quality of the whole vehicle is reduced; meanwhile, the influence of the heat of the exhaust system on peripheral parts can be reduced, and the service life of the peripheral parts is prolonged.

In particular, as is apparent from fig. 1, the muffler insulation wool 5 located between the muffler inner shell 3 and the muffler outer shell 4 is in close contact with the muffler inner shell 3 and the muffler outer shell 4, respectively.

The present application provides an exhaust system muffler including two mufflers, i.e., a front muffler 11 and a rear muffler 12.

Specifically, as described above, the structure of the front muffler 11 and the structure of the rear muffler 12 are each a structure in which the muffler core is wrapped with a shell. Thus, the pre-muffler 11 includes a pre-muffler shell 10 and a pre-muffler inner core 6, wherein the pre-muffler shell 10 includes a pre-muffler inner shell 7, a pre-muffler insulation 9, and a pre-muffler outer shell 8; the rear muffler 12 includes a rear muffler shell 17 and a rear muffler core 13, wherein the rear muffler shell 17 includes a rear muffler inner shell 14, a rear muffler insulation wool 16, and a rear muffler outer shell 15.

Fig. 2 is a schematic structural diagram of a pre-muffler according to an embodiment of the present application. Referring to fig. 2, the pre-muffler 11 includes a pre-muffler front end cover 18 and a pre-muffler rear end cover 19. The front muffler front end cover 18 and the front muffler rear end cover 19 respectively cover two bottom surfaces of the cylindrical structure of the front muffler shell 10, so that the front muffler shell 10, the front muffler front end cover 18 and the front muffler rear end cover 19 jointly enclose a front muffler cavity, and the front muffler inner core 6 is arranged inside the front muffler cavity.

As shown in fig. 2, the pre-muffler inner core 6 comprises a pre-muffler inlet pipe 22 and a pre-muffler outlet pipe 23, and the pre-muffler inlet pipe 22 and the pre-muffler outlet pipe 23 are both hollow straight pipes; the pre-muffler inlet pipe 22 and the pre-muffler outlet pipe 23 are inserted into the pre-muffler cavity in a direction perpendicular to the plane of the pre-muffler front end cover 18. A first through hole 24 is arranged in the center of the front muffler front end cover 18, an air inlet 25 of the front muffler air inlet pipe penetrates out of the first through hole 24 of the front muffler front end cover 18 and is arranged on the outer side of the front muffler shell 10, and an air outlet 26 of the front muffler air inlet pipe is positioned in the front muffler cavity; the center of the front muffler rear end cover 19 is provided with a second through hole 29, the air outlet 28 of the front muffler air outlet pipe penetrates out of the second through hole 29 of the front muffler rear end cover 19 and is arranged on the outer side of the front muffler shell 10, and the air inlet 27 of the front muffler air outlet pipe is positioned in the front muffler cavity.

The pre-muffler core 6 also includes two first partitions 42. Referring to fig. 2, two first partition plates 42 are arranged inside the front muffler cavity at intervals to divide the front muffler cavity into three parallel chambers, and the planes of the two first partition plates 42 are parallel to the plane of the front muffler front end cover 18. The chambers are silencing units, and when sound waves pass through the chambers, reflection or interference occurs, so that the silencing and noise reduction effects are achieved.

The rear muffler 12 has substantially the same structure as the front muffler 11, and includes a rear muffler shell 17 and a rear muffler core 13.

FIG. 3 is a schematic structural diagram of a rear muffler according to an embodiment of the present application. Referring to fig. 3, the rear muffler 12 further includes a rear muffler front end cover 20 and a rear muffler rear end cover 21; the rear muffler front end cover 20 and the rear muffler rear end cover 21 respectively cover two bottom surfaces of the cylindrical structure of the rear muffler shell 17, so that the rear muffler shell 17, the rear muffler front end cover 20 and the rear muffler rear end cover 21 jointly enclose a rear muffler cavity, and the rear muffler inner core 13 is arranged inside the rear muffler cavity.

As shown in fig. 3, the rear muffler core 13 includes a rear muffler inlet pipe 30; a third through hole 32 is formed in the side wall of the rear muffler shell 17, an air inlet 31 of the rear muffler air inlet pipe penetrates through the third through hole 32 and is arranged on the outer side of the rear muffler shell 17, and an air outlet 33 of the rear muffler air inlet pipe is located in the rear muffler cavity. The rear muffler inlet pipe 30 is used to introduce the exhaust gas of the previous stage into the rear muffler 12.

As can be seen in fig. 3, the rear muffler core 13 is similar in structural composition to the front muffler core 6, and also includes an inner pipe and a baffle. The four second partition plates 44 are arranged inside the rear muffler cavity at intervals, the rear muffler cavity is divided into five parallel chambers, and the planes of the four second partition plates 44 are parallel to the plane of the front end cover 20 of the rear muffler. The inner pipe 45 is disposed inside the rear muffler cavity and traverses the second partition 44. Similar to the front muffler inner core 6, the rear muffler inner core 13 also divides the rear muffler cavity into a plurality of chambers by the inner pipe and the partition plate, and each chamber is a sound attenuation unit for reflecting or interfering sound waves passing through the chamber, thereby achieving the effects of sound attenuation and noise reduction.

The exhaust system silencer that this application embodiment provided passes through connecting pipe series connection pre-silencer and back silencer.

Fig. 4 is a schematic structural diagram of a muffler assembly of an exhaust system according to an embodiment of the present disclosure. As is apparent from fig. 4, the exhaust system muffler further includes a first connection pipe 35, a second connection pipe 36, and a gas discharge pipe 37. Wherein one end of the first connecting pipe 35 is connected to an internal combustion engine of a vehicle through a flange 43 for guiding an exhaust gas flow generated from the internal combustion engine into the exhaust system muffler, and the other end of the first connecting pipe 35 is connected to the intake port 25 of the intake pipe of the pre-muffler; one end of the second connecting pipe 36 is connected to the outlet 28 of the outlet pipe of the pre-muffler, and the other end of the second connecting pipe 36 is connected to the inlet 31 of the inlet pipe of the rear muffler.

As can be seen from fig. 4, a fourth through hole 34 is formed in the rear muffler rear end cover 21, the fourth through hole 34 is used for mounting a gas discharge pipe 37, the gas discharge pipe 37 is used for discharging the exhaust gas passing through the rear muffler 12, and the gas discharge pipe 37 is also an exhaust duct of the entire exhaust system muffler.

Further, the exhaust system silencer provided by the embodiment of the application is also provided with a hook assembly for positioning. Referring specifically to fig. 4, the exhaust system muffler further includes a first hook assembly 38, a second hook assembly 39, a third hook assembly 40, and a fourth hook assembly 41. The first and second hook assemblies 38 and 39 are arranged on the second connecting pipe 36 at intervals, and are fixedly connected with the second connecting pipe 36; the third and fourth hook assemblies 40 and 41 are fixedly connected to the rear muffler front end cover 20 and the rear muffler rear end cover 21, respectively.

In summary, the present application provides an exhaust system muffler including a front muffler and a rear muffler, and connecting the two mufflers by a connecting pipe. Particularly, the shell of the front silencer and the shell of the rear silencer are respectively added with the silencer heat insulation cotton which has the functions of absorbing noise of an exhaust system and insulating heat, so that a heat insulation device is not required to be additionally arranged for the silencer, the development of heat insulation parts is reduced, more space is vacated for the interior of a vehicle, and the mass of the whole vehicle is reduced; meanwhile, the influence of the heat of the exhaust system on peripheral parts can be reduced, and the service life of the peripheral parts is prolonged.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.

It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. An automotive exhaust system muffler, comprising: a silencer inner core (1) and a silencer shell (2);

the silencer shell (2) is of a hollow cylindrical structure, and the silencer inner core (1) is positioned in the silencer shell (2);

the silencer shell (2) comprises a silencer inner shell (3), a silencer outer shell (4) and silencer heat insulation cotton (5), wherein the silencer heat insulation cotton (5) is located between the silencer inner shell (3) and the silencer outer shell (4).

2. An exhaust system muffler according to claim 1, characterized in that the muffler comprises a pre-muffler (11);

the silencer inner core (1) comprises a pre-silencer inner core (6), the silencer inner shell (3) comprises a pre-silencer inner shell (7), the silencer outer shell (4) comprises a pre-silencer outer shell (8), and the silencer heat insulation cotton (5) comprises pre-silencer heat insulation cotton (9);

the front silencer inner shell (7), the front silencer heat insulation cotton (9) and the front silencer outer shell (8) jointly form a front silencer shell (10);

the pre-muffler (11) includes the pre-muffler inner core (6) and the pre-muffler shell (10).

3. The exhaust system muffler of claim 2 further comprising a rear muffler (12);

the silencer inner core (1) comprises a rear silencer inner core (13), the silencer inner shell (3) comprises a rear silencer inner shell (14), the silencer outer shell (4) comprises a rear silencer outer shell (15), and the silencer heat insulation cotton (5) comprises rear silencer heat insulation cotton (16);

wherein the rear muffler inner shell (14), the rear muffler heat insulation cotton (16) and the rear muffler outer shell (15) jointly form a rear muffler shell (17);

the rear muffler (12) includes the rear muffler inner core (13) and the rear muffler shell (17).

4. The exhaust system muffler of claim 3 wherein the pre-muffler (11) further comprises a pre-muffler front end cover (18) and a pre-muffler rear end cover (19), and the rear muffler (12) further comprises a rear muffler front end cover (20) and a rear muffler rear end cover (21);

the front muffler front end cover (18) and the front muffler rear end cover (19) respectively cover two bottom surfaces of the cylindrical structure of the front muffler shell (10), so that the front muffler shell (10), the front muffler front end cover (18) and the front muffler rear end cover (19) jointly enclose a front muffler cavity, and the front muffler inner core (6) is arranged in the front muffler cavity;

the rear silencer front end cover (20) and the rear silencer rear end cover (21) respectively cover two bottom surfaces of the cylindrical structure of the rear silencer shell (17), so that the rear silencer shell (17), the rear silencer front end cover (20) and the rear silencer rear end cover (21) jointly enclose a rear silencer cavity, and the rear silencer inner core (13) is arranged in the rear silencer cavity.

5. The exhaust system muffler of claim 4, wherein the pre-muffler inner core (6) includes a pre-muffler inlet pipe (22) and a pre-muffler outlet pipe (23), the pre-muffler inlet pipe (22) and the pre-muffler outlet pipe (23) being both hollow straight pipes;

the front silencer air inlet pipe (22) and the front silencer air outlet pipe (23) are inserted in the front silencer cavity along the direction vertical to the plane of the front silencer front end cover (18);

a first through hole (24) is formed in the center of the front muffler front end cover (18), an air inlet (25) of a front muffler air inlet pipe penetrates through the first through hole (24) of the front muffler front end cover (18) and is arranged on the outer side of the front muffler shell (10), and an air outlet (26) of the front muffler air inlet pipe is located in the front muffler cavity;

the center of the front silencer rear end cover (19) is provided with a second through hole (29), an air outlet (28) of a front silencer air outlet pipe penetrates through the second through hole (29) of the front silencer rear end cover (19) and is arranged on the outer side of the front silencer shell (10), and an air inlet (27) of the front silencer air outlet pipe is located in the front silencer cavity.

6. The exhaust system muffler of claim 5 wherein the rear muffler inner core (13) includes a rear muffler inlet pipe (30);

the side wall of the rear silencer shell (17) is provided with a third through hole (32), an air inlet (31) of the rear silencer air inlet pipe penetrates out of the third through hole (32) and is arranged on the outer side of the rear silencer shell (17), and an air outlet (33) of the rear silencer air inlet pipe is located in the rear silencer cavity.

7. The exhaust system muffler according to claim 6, further comprising a first connecting pipe (35), a second connecting pipe (36), and a gas discharge pipe (37);

wherein one end of the first connecting pipe (35) is connected to an internal combustion engine of a vehicle for guiding an exhaust gas flow generated by the internal combustion engine into the exhaust system muffler, and the other end of the first connecting pipe (35) is connected to an air inlet (25) of the intake pipe of the pre-muffler;

one end of the second connecting pipe (36) is connected with the air outlet (28) of the air outlet pipe of the front silencer, and the other end of the second connecting pipe (36) is connected with the air inlet (31) of the air inlet pipe of the rear silencer;

and a fourth through hole (34) is formed in the rear end cover (21) of the rear silencer, the fourth through hole (34) is used for installing the gas exhaust pipe (37), and the gas exhaust pipe (37) is used for exhausting waste gas passing through the rear silencer (12).

8. The exhaust system muffler of claim 7 further comprising a first hook assembly (38), a second hook assembly (39), a third hook assembly (40), and a fourth hook assembly (41);

the first lifting hook assembly (38) and the second lifting hook assembly (39) are arranged on the second connecting pipe (36) at intervals and are fixedly connected with the second connecting pipe (36);

the third lifting hook assembly (40) and the fourth lifting hook assembly (41) are fixedly connected with the front end cover (20) of the rear silencer and the rear end cover (21) of the rear silencer respectively.

9. The exhaust system muffler according to claim 1, wherein the muffler heat insulating wool (5) between the muffler inner shell (3) and the muffler outer shell (4) is closely attached to the muffler inner shell (3) and the muffler outer shell (4), respectively.

10. The exhaust system muffler according to claim 5 characterized in that the rear muffler inner core (13) includes two first partitions (42);

the two first partition plates (42) are arranged in the front silencer cavity at intervals, the front silencer cavity is divided into three parallel chambers, and the planes of the two first partition plates (42) are parallel to the plane of the front silencer front end cover.

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