Automobile exhaust system and vehicle

Abstract

The utility model discloses an automobile exhaust system and a vehicle, the automobile exhaust system comprises a doorsill beam and an exhaust pipe, the doorsill beam comprises a first doorsill part and a second doorsill part which are connected with each other, and the first doorsill part and the second doorsill part are encircled in the doorsill beam to form a mounting cavity; at least part of the exhaust pipe is arranged in the mounting cavity, and a vibration buffering layer is arranged between the outer wall of the exhaust pipe and the mounting cavity. By means of the scheme, the automobile exhaust system can optimize the space utilization rate and prolong the service life, installation is convenient, and the NVH performance of the whole automobile is guaranteed.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to an automotive exhaust system and vehicle. Background Technology

[0002] The car exhaust system is a crucial component, primarily responsible for collecting and discharging the exhaust gases produced during engine operation, while simultaneously reducing exhaust pollution and noise.

[0003] Existing exhaust systems, including exhaust pipes and front and rear mufflers, typically extend from the front to the rear of the vehicle, occupying considerable space. For hybrid or range-extended vehicles, a battery pack is also installed inside the vehicle. The exhaust pipe's placement further restricts the battery pack's installation space, leading to limited space in the lower part of the vehicle. Furthermore, the high temperatures generated by the exhaust pipe during operation can negatively impact the battery pack's performance and lifespan. Therefore, exhaust pipe design must consider overall vehicle emissions, NVH (Noise, Vibration, Harshness) performance, fuel economy, and thermal management performance. Utility Model Content

[0004] The main technical problem addressed by this application is to provide an automotive exhaust system and vehicle that can optimize space utilization, improve service life, facilitate installation, and ensure the overall NVH performance of the vehicle.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide an automobile exhaust system, including a door sill beam and an exhaust pipe, wherein the door sill beam includes a first door sill portion and a second door sill portion connected to each other, the first door sill portion and the second door sill portion together forming an installation cavity within the door sill beam; at least a portion of the exhaust pipe is disposed within the installation cavity, and a damping layer is provided between the outer wall of the exhaust pipe and the installation cavity.

[0006] Preferably, the threshold beam is provided with a first mounting hole and a second mounting hole, both of which are in communication with the mounting cavity. The exhaust pipe passes through the first mounting hole and the second mounting hole, and the damping layer is at least pressed between the exhaust pipe and the first mounting hole and between the exhaust pipe and the second mounting hole.

[0007] Preferably, the damping layer includes a plurality of damping portions spaced apart, and the plurality of damping portions are arranged along the extension direction of the exhaust pipe.

[0008] Preferably, the exhaust pipe is covered with a heat insulation layer, which is located at least between the exhaust pipe and the vibration damping layer.

[0009] Preferably, the heat insulation layer includes a first heat insulation sub-layer and a second heat insulation sub-layer stacked sequentially from the inside to the outside, wherein the hardness of the second heat insulation sub-layer is greater than that of the first heat insulation sub-layer, and the thickness of the first heat insulation sub-layer is greater than that of the second heat insulation sub-layer.

[0010] Preferably, the sill beam is provided with heat dissipation holes that connect the mounting cavity and the outside of the sill beam.

[0011] Preferably, the first threshold portion has a mounting groove on the side facing the second threshold portion, the inner wall of the mounting groove is fitted to a portion of the outer wall of the threshold beam, and the mounting groove and the second threshold portion together form the mounting cavity.

[0012] Preferably, the vehicle exhaust system further includes a front muffler, a rear muffler, and a vibration decoupling assembly. The front muffler is connected to the exhaust pipe via a first connecting pipe; and / or, the rear muffler is connected to the exhaust pipe via a second connecting pipe. The vibration decoupling assembly is connected between the first connecting pipe and / or the second connecting pipe and the exhaust pipe. The vibration decoupling assembly includes a first flange, a second flange, a boss bolt, a spring, and a nut. The first flange is sleeved on the end of the exhaust pipe away from the sill beam, and a spherical sealing ring is provided between the first flange and the exhaust pipe. The second flange is sleeved on the end of the first connecting pipe and / or the second connecting pipe near the exhaust pipe. The boss bolt passes through the first flange and the second flange in sequence. The first flange and the second flange are respectively located on both sides of the boss of the boss bolt. The spring is sleeved on the boss bolt, and both ends of the spring abut against the boss bolt and the first flange, respectively. The nut is threadedly connected to the boss bolt, and the nut locks the second flange to the boss.

[0013] Preferably, the exhaust pipe includes a first exhaust sub-pipe and two second exhaust sub-pipes respectively connected to both ends of the first exhaust sub-pipe. A portion of the first exhaust sub-pipe is disposed within the mounting cavity, and both ends of the first exhaust sub-pipe extend beyond the sill beam through the first mounting hole and the second mounting hole respectively. A third flange is connected to both ends of the first exhaust sub-pipe. A fourth flange is connected to one end of each of the two second exhaust sub-pipes. The third flange and the fourth flange are disposed opposite to each other and fixedly connected, and a flange sealing gasket is provided between the third flange and the fourth flange.

[0014] Another technical solution adopted in this application is: a vehicle, including the automobile exhaust system described in any embodiment.

[0015] The beneficial effects of this application are as follows: Unlike existing technologies, this application integrates part of the exhaust passage in the exhaust system into the sill beam, allowing the exhaust airflow to pass through the sill beam. This structure improves the integration of the exhaust system and increases space utilization. For range-extended and hybrid vehicles, it provides more space for the battery pack, thus increasing the battery pack volume and improving vehicle range. It also prevents the exhaust pipe from directly contacting road debris, extending its service life. Furthermore, the separate design of the sill beam facilitates the installation of the exhaust pipe inside the sill beam and ensures a secure connection between the exhaust pipe and the sill beam. Additionally, the airflow impact in the exhaust pipe generates vibration. This application uses a buffer layer between the mounting cavity inside the sill beam and the outer wall of the exhaust pipe to mitigate the transmission of vibration from the sill beam to the vehicle interior, ensuring overall vehicle NVH performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the automobile exhaust system of this application;

[0017] Figure 2 yes Figure 1 The right view;

[0018] Figure 3 yes Figure 2 Exploded view;

[0019] Figure 4 This is a cross-sectional view of one embodiment of the automotive exhaust system of this application;

[0020] Figure 5 yes Figure 1 A bottom view;

[0021] Figure 6 This is a structural schematic diagram of one embodiment of the vehicle described in this application;

[0022] Figure 7 This is a structural schematic diagram of one embodiment of the vibration decoupling component. Detailed Implementation

[0023] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following detailed description is provided with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] See Figure 1 and combined Figure 2 , Figure 1 This is a schematic diagram of one embodiment of the automotive exhaust system of this application. Figure 2 yes Figure 1 The right view shows the vehicle exhaust system 10, which includes a sill beam 1 and an exhaust pipe 2. Specifically, the sill beam 1 is a strip-shaped frame structure extending along the front-rear direction of the vehicle body. The sill beam 1 includes a first sill portion 11 and a second sill portion 12 connected to each other, forming a mounting cavity 101 within the sill beam 1. Specifically, both the first sill portion 11 and the second sill portion 12 are strip-shaped, extending along the front-rear direction of the vehicle body, and the mounting cavity 101 formed inside is also strip-shaped. At least a portion of the exhaust pipe 2 is disposed within the mounting cavity 101, and a damping layer 21 is provided between the outer wall of the exhaust pipe 2 and the mounting cavity 101.

[0025] This application integrates part of the exhaust pipe 2 from the exhaust system into the door sill beam 1. The exhaust airflow passes through the interior of the door sill beam 1. This structure improves the integration of the exhaust system and increases space utilization. For range-extended and hybrid vehicles, it allows for more space for the battery pack, thus increasing the battery pack volume and improving the vehicle's range. Furthermore, the door sill beam 1 protects the exhaust pipe 2 from direct contact with road debris, extending its service life. Simultaneously, the separate design of the door sill beam 1 facilitates the installation of the exhaust pipe 2 inside and ensures a secure connection between the exhaust pipe 2 and the door sill beam 1. Additionally, the airflow impact in the exhaust pipe 2 generates vibration. This application utilizes a buffer layer between the mounting cavity 101 inside the door sill beam 1 and the outer wall of the exhaust pipe 2 to mitigate the transmission of vibration from the door sill beam to the vehicle interior, ensuring overall vehicle NVH performance.

[0026] Optionally, see Figure 3 , Figure 3 yes Figure 2 The exploded view shows that the first sill portion 11 has a mounting groove 111 on the side facing the second sill portion 12. The inner wall of the mounting groove 111 is fitted to a portion of the outer wall of the sill beam 1, and the mounting groove 111 and the second sill portion 12 together form a mounting cavity 101. Specifically, the shape of the mounting groove 111 is adapted to the shape of the exhaust pipe 2, and can be a semi-circular groove or a semi-elliptical groove, ensuring that after the first sill portion 11 and the second sill portion 12 are fixedly connected, the side wall of the exhaust pipe 2 can be completely fitted to the mounting groove 111, positioning the exhaust pipe 2 while avoiding affecting the back pressure of the entire system.

[0027] Specifically, the first threshold portion 11 also includes a first frame 112. The first frame 112 has a notch on the side facing the second threshold portion 12. The first frame 112 and the mounting groove 111 enclose a cavity (not shown). Multiple first support plates 113 are provided in the cavity, which ensures the strength of the first threshold portion 11 while achieving weight reduction. The second threshold portion 12 includes a second frame 121 and a second support plate 122. The second support plate 122 is disposed inside the second frame 121 and extends towards the mounting groove 111. The end of the second support plate 122 is attached to the outer wall of the exhaust pipe 2. The two ends of the first frame 112 are welded to the two ends of the second frame 121, respectively. The exhaust system of this application is installed as follows: First, the exhaust pipe 2 is pre-installed into the first threshold portion 11, ensuring that the exhaust pipe 2 and the damping layer 21 are interference-fitted. Then, after welding the second threshold portion 12 to the first threshold portion 11, the exhaust pipe 2 is clamped and fixed, ensuring that the damping layer 21 has a compression of 1 mm. In other embodiments, the first threshold portion 11 and the second threshold portion 12 may also be connected by bolts.

[0028] Optionally, continue reading Figure 1 The sill beam 1 is provided with a first mounting hole 1a and a second mounting hole 1b, both of which are connected to the mounting cavity 101. The exhaust pipe 2 passes through the first mounting hole 1a and the second mounting hole 1b. The damping layer 21 is at least pressed between the exhaust pipe 2 and the first mounting hole 1a and between the exhaust pipe 2 and the second mounting hole 1b. Specifically, the first mounting hole 1a and the second mounting hole 1b are both located on the same side of the sill beam 1. The damping layer 21 can prevent the interface of the exhaust pipe 2 from directly contacting the sill beam 1, thereby avoiding direct heat conduction between the two and preventing the high temperature of the exhaust airflow from being conducted to the sill beam 1 and causing it to heat up, thus ensuring the service life and performance of the sill beam 1 and surrounding components (such as the battery pack).

[0029] Optionally, continue reading Figure 1 The vibration damping layer 21 includes multiple spaced-apart damping portions 211 arranged along the extension direction of the exhaust pipe 2. Specifically, the damping portions 211 can be steel wool vibration damping pads, which are arranged in a ring around the exhaust pipe 2. Multiple damping portions 211 are provided, with two damping portions 211 respectively located in the first mounting hole 1a and the second mounting hole 1b, and the remaining portions 211 evenly spaced in the middle of the exhaust pipe 2. This further reduces the probability of direct contact between the exhaust pipe 2 and the mounting cavity 101, and saves material for the damping portions 211, thus reducing costs. In other embodiments, the damping portions 211 can be a single layer covering the exhaust pipe 2.

[0030] Optionally, see Figure 4 , Figure 4This is a cross-sectional view of one embodiment of the automotive exhaust system of this application. A heat insulation layer 22 is wrapped around the exhaust pipe 2, and the heat insulation layer 22 is located at least between the exhaust pipe 2 and the damping layer 21. By wrapping the exhaust pipe 2 with the heat insulation layer 22, the heat from the airflow in the exhaust pipe 2 can be prevented from being transferred to the sill beam 1 and the vehicle body.

[0031] Furthermore, the heat insulation layer 22 includes a first heat insulation sublayer 221 and a second heat insulation sublayer 222 stacked sequentially from the inside out. The hardness of the second heat insulation sublayer 222 is greater than that of the first heat insulation sublayer 221, and the thickness of the first heat insulation sublayer 221 is greater than that of the second heat insulation sublayer 222. Specifically, the material of the first heat insulation sublayer 221 can be aerogel heat insulation cotton with a thickness of 15mm-20mm (e.g., 18mm). It has extremely high porosity and specific surface area, as well as extremely low thermal conductivity, which can effectively suppress heat conduction and convection. The first heat insulation sublayer 221 is wrapped with the second heat insulation sublayer 222. The material of the second heat insulation sublayer 222 can be a stainless steel heat insulation cover with a thickness of 0.1mm-0.2mm (e.g., 0.15mm). It has good mechanical properties and corrosion resistance, and can reflect some heat, reducing heat transfer through radiation, while also protecting the internal first heat insulation sublayer 221.

[0032] Optionally, see Figure 5 and Figure 6 , Figure 5 yes Figure 1 The bottom view, Figure 6 This is a structural schematic diagram of one embodiment of the vehicle described in this application. The sill beam 1 is provided with heat dissipation holes 13 connecting the mounting cavity (not shown) and the exterior of the sill beam 1. Specifically, multiple heat dissipation holes 13 are provided, and the multiple heat dissipation holes 13 are evenly spaced to continuously dissipate excess heat from the sill beam 1.

[0033] Optionally, continue reading Figure 6 The automotive exhaust system 10 also includes a front muffler 4, a rear muffler 5, and two sets of vibration decoupling components 3. The front muffler 4 is connected to the exhaust pipe 2 via a first connecting pipe 41, and the rear muffler 5 is connected to the exhaust pipe 2 via a second connecting pipe 51. Both the front muffler 4 and the rear muffler 5 are used to treat the noise generated during exhaust. The vibration decoupling components 3 are connected between the first connecting pipe 41 and the exhaust pipe 2, and between the second connecting pipe 51 and the exhaust pipe 2. In this embodiment, vibration decoupling components 3 are connected to both ends of the exhaust pipe 2. In other embodiments, vibration decoupling components 3 may be connected to only one end of the exhaust pipe 2.

[0034] See Figure 7 , Figure 7This is a schematic diagram of one embodiment of the vibration decoupling assembly. The vibration decoupling assembly 3 includes a first flange 31, a second flange 32, a boss bolt 33, a spring 34, and a nut 35. The first flange 31 is fitted over the end of the exhaust pipe 2 away from the sill beam 1, and a spherical sealing ring 36 is provided between the first flange 31 and the exhaust pipe 2. The second flange 32 is fitted over the end of the first connecting pipe 41 / second connecting pipe 51 near the exhaust pipe 2. The boss bolt 33 passes through the first flange 31 and the second flange 32 in sequence. The first flange 31 and the second flange 32 are respectively located on both sides of the boss 331 of the boss bolt 33. The spring 34 is fitted over the boss bolt 33, and both ends of the spring 34 abut against the boss bolt 33 and the first flange 31, respectively. The nut 35 is threadedly connected to the boss bolt 33, and the nut 35 locks the second flange 32 and the boss 331. The spherical sealing ring 36 is made of graphite and can rotate between the first flange 31 and the second flange 32, thus decoupling the vibration. Meanwhile, the spring 34 can dampen vibrations, preventing engine vibrations from being transmitted to the exhaust pipe 2 through the first connecting pipe 41 / second connecting pipe 51, and avoiding vibrations from being transmitted to the vehicle interior through the sill beam 1, thereby ensuring the comfort of driving and riding in the vehicle.

[0035] Optionally, continue reading Figure 1 and combined Figure 6 The exhaust pipe 2 includes a first exhaust sub-pipe 201 and two second exhaust sub-pipes 202 respectively connected to both ends of the first exhaust sub-pipe 201. A portion of the first exhaust sub-pipe 201 is disposed within the mounting cavity 101, and both ends of the first exhaust sub-pipe 201 extend beyond the sill beam 1 through a first mounting hole 1a and a second mounting hole 1b, respectively. A third flange 23 is connected to both ends of the first exhaust sub-pipe 201. The third flange 23 is located outside the sill beam 1 to avoid direct contact with it and reduce heat conduction. A fourth flange 24 is connected to one end of each of the two second exhaust sub-pipes 202; the third flange 23 and the fourth flange 24 are opposite to each other and fixedly connected, and a flange sealing gasket 25 is provided between the third flange 23 and the fourth flange 24. The flange sealing gasket 25 is used to prevent air leakage at the joint between the second exhaust sub-pipe 202 and the first connecting pipe 41 / second connecting pipe 51.

[0036] This application also provides a vehicle 100, which can be a pure gasoline vehicle, and the vehicle 100 includes the vehicle exhaust system 10 of any of the above embodiments. The vehicle 100 can also be a range-extended vehicle or a hybrid vehicle, such as... Figure 6As shown, the vehicle 100 includes the automotive exhaust system 10 and battery pack 20 as described in any of the above embodiments, with the battery pack 20 connected to one side of the sill beam 1. The vehicle 100 provided in this application has a high space utilization rate, achieving weight reduction and cost reduction. For range-extended or hybrid vehicles, the vehicle 100 has a higher pure electric range, which can be improved by more than 60% compared to the prior art.

[0037] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. An automotive exhaust system characterized by comprising: The automobile exhaust system comprises: a threshold beam comprising a first threshold part and a second threshold part connected to each other, the first threshold part and the second threshold part enclosing a mounting cavity in the threshold beam, the threshold beam being provided with a first mounting hole and a second mounting hole, the first mounting hole and the second mounting hole being in communication with the mounting cavity; an exhaust pipe, at least part of the exhaust pipe being arranged in the mounting cavity, a vibration damping layer being arranged between the outer wall of the exhaust pipe and the mounting cavity, the exhaust pipe being arranged in the first mounting hole and the second mounting hole, the vibration damping layer being compressed at least between the exhaust pipe and the first mounting hole and between the exhaust pipe and the second mounting hole.

2. The automobile exhaust system according to claim 1, wherein the vibration damping layer comprises a plurality of vibration damping parts arranged at intervals, the plurality of vibration damping parts being arranged along the extension direction of the exhaust pipe.

3. The automobile exhaust system according to claim 1, wherein the exhaust pipe is wrapped with a heat insulation layer, the heat insulation layer being arranged at least between the exhaust pipe and the vibration damping layer.

4. The automobile exhaust system according to claim 3, wherein the heat insulation layer comprises a first heat insulation sub-layer and a second heat insulation sub-layer arranged in sequence from inside to outside, the second heat insulation sub-layer having a greater hardness than the first heat insulation sub-layer, the first heat insulation sub-layer having a greater thickness than the second heat insulation sub-layer.

5. The automobile exhaust system according to claim 4, wherein the threshold beam is provided with a heat dissipation hole in communication with the mounting cavity and outside the threshold beam.

6. The automobile exhaust system according to claim 1, wherein the first threshold part is provided with a mounting groove on the side facing the second threshold part, the inner wall of the mounting groove being arranged in abutment with part of the outer wall of the threshold beam, the mounting groove and the second threshold part enclosing the mounting cavity.

7. The automotive exhaust system of claim 5, wherein The automobile exhaust system further comprises: a front muffler connected to the exhaust pipe through a first connecting pipe; and / or a rear muffler connected to the exhaust pipe through a second connecting pipe; a vibration decoupling assembly connected between the first connecting pipe and / or the second connecting pipe and the exhaust pipe, the vibration decoupling assembly comprising a first flange, a second flange, a boss bolt, a spring and a nut; the first flange being arranged outside the end of the exhaust pipe away from the threshold beam, a spherical sealing ring being arranged between the first flange and the exhaust pipe, the second flange being arranged at the end of the first connecting pipe and / or the second connecting pipe close to the exhaust pipe, the boss bolt being arranged in sequence through the first flange and the second flange, the first flange and the second flange being arranged on the two sides of the boss of the boss bolt respectively, the spring being arranged outside the boss bolt, the two ends of the spring being in abutment with the boss bolt and the first flange respectively, the nut being threadedly connected with the boss bolt, the nut locking the second flange and the boss.

8. The automobile exhaust system according to claim 1, wherein The exhaust pipe comprises a first exhaust sub-pipe and two second exhaust sub-pipes respectively connected at two ends of the first exhaust sub-pipe, wherein part of the first exhaust sub-pipe is arranged in the mounting cavity, and the two ends of the first exhaust sub-pipe extend out of the rocker beam through the first mounting hole and the second mounting hole respectively, and a third flange is connected to each of the two ends of the first exhaust sub-pipe; a fourth flange is connected to each of one end of the two second exhaust sub-pipes; The third flange is oppositely arranged and fixedly connected with the fourth flange, and a flange sealing gasket is arranged between the third flange and the fourth flange.

9. A vehicle characterized by comprising: The automobile exhaust system comprises: The automobile exhaust system according to any one of claims 1-8.

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