Lower vehicle body structure and vehicle

Abstract

The embodiment of the utility model provides a lower vehicle body structure and a vehicle, and belongs to the technical field of vehicle parts, and the lower vehicle body structure comprises a doorsill beam, an inner exhaust pipe, an outer exhaust pipe and a limiting connecting assembly. A containing cavity is formed in the doorsill beam, and an opening communicating with the containing cavity is formed in one side of the doorsill beam; the inner exhaust pipe is arranged in the containing cavity, and the outer exhaust pipe is located on one side of the doorsill beam and communicates with the inner exhaust pipe through the opening; and the limiting connecting assembly is arranged in the containing cavity, the threshold beam and the inner exhaust pipe are connected through the limiting connecting assembly, and the limiting connecting assembly is configured to stretch out and draw back in the preset direction when the inner exhaust pipe vibrates so that the inner exhaust pipe can move relative to the threshold beam. According to the lower vehicle body structure provided by the embodiment of the invention, the problem of resonance of the threshold beam caused by vibration of the exhaust pipe can be avoided, so that the NVH performance of the vehicle is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle component technology, and in particular to a lower body structure and a vehicle. Background Technology

[0002] Currently, hybrid vehicles integrate and install power battery packs and exhaust pipes under the floor. The exhaust pipes and power battery packs are arranged side by side along the width of the vehicle. The exhaust pipes encroach on the space of the power battery pack, affecting the battery capacity of the power battery pack and hindering the improvement of the vehicle's driving range.

[0003] In related technologies, exhaust pipes are typically concealed within the door sill beam to reduce the space they occupy. However, the exhaust pipe experiences slight vibrations due to the vibrations transmitted from the engine, which can cause the exhaust pipe within the door sill beam to resonate, affecting the vehicle's overall noise, vibration, and harshness (NVH) performance. Utility Model Content

[0004] This application provides a lower body structure and vehicle to solve the technical problem in the related art that the exhaust pipe in the sill beam can easily cause the sill beam to resonate.

[0005] On the one hand, this application provides a lower body structure, including:

[0006] A sill beam has an internal cavity, and one side of the sill beam has an opening that communicates with the cavity;

[0007] An internal exhaust pipe and an external exhaust pipe are provided. The internal exhaust pipe is located in the receiving cavity, and the external exhaust pipe is located on one side of the sill beam and communicates with the internal exhaust pipe through the opening.

[0008] A limiting connection assembly is disposed in the receiving cavity. The sill beam and the inner exhaust pipe are connected through the limiting connection assembly. The limiting connection assembly is configured to extend and retract in a preset direction when the inner exhaust pipe vibrates, so as to displace the inner exhaust pipe relative to the sill beam.

[0009] In some possible implementations, the limiting connection component includes:

[0010] The first connector is connected to the side wall of the sill beam;

[0011] The second connector is connected to the side wall of the internal exhaust pipe;

[0012] A movable pad, wherein both the first connector and the second connector are inserted into the movable pad, and at least one of the first connector and the second connector is capable of telescoping within the movable pad.

[0013] In some possible implementations, the first connector has a first locking portion on the side facing the internal exhaust pipe, the first locking portion being used to prevent the first connector from disengaging from the movable pad.

[0014] The second connector has a second locking part on the side opposite to the internal exhaust pipe, which is used to prevent the second connector from disengaging from the movable pad.

[0015] In some possible implementations, the movable pad has an opening that extends through the movable pad in the radial direction of the internal exhaust pipe. The first connector passes through the opening and can reciprocate in the axial direction of the opening. The first snap-fit ​​part is an elastic snap-fit ​​head that snaps into the opening.

[0016] In some possible implementations, the movable pad is provided with a mounting groove, and the end of the second snap-fit ​​portion opposite to the internal exhaust pipe snaps into the mounting groove.

[0017] In some possible implementations, an inner mounting plate is connected to the end of the inner exhaust pipe facing the opening, and an outer mounting plate is connected to the end of the outer exhaust pipe facing the opening. The inner mounting plate, the outer mounting plate, and at least a portion of the sill beam sidewall are connected.

[0018] In some possible implementations, it also includes:

[0019] A heat insulation plate is disposed in the receiving cavity, the heat insulation plate is arranged to extend along the length direction of the threshold beam, and the internal exhaust pipe is located between the heat insulation plate and the opening;

[0020] A heat dissipation opening is provided on the side of the sill beam facing the external exhaust pipe, and the heat dissipation opening is used to output the heat generated by the internal exhaust pipe.

[0021] In some possible implementations, the heat insulation plate is snapped onto the internal exhaust pipe, and the heat insulation plate is provided with reinforcing ribs.

[0022] In some possible implementations, the heat insulation plate has a plurality of spaced-apart openings along the length of the sill beam; the heat dissipation openings have a plurality of spaced-apart openings along the length of the sill beam.

[0023] On the other hand, this application provides a vehicle, including a vehicle body and a lower body structure as described in any of the above claims disposed on the vehicle body.

[0024] The lower body structure and vehicle provided in this application integrate the internal exhaust pipe into the sill beam cavity within the lower body structure. This avoids spatial interference between the exhaust pipe and the power battery pack in the vehicle width direction, facilitating lateral expansion of the battery pack and increasing its capacity. Furthermore, the telescopic design of the limiting connection assembly allows the internal exhaust pipe to move to a certain extent relative to the sill beam in a preset direction during vibration. Thus, the limiting connection assembly transforms the rigid connection between the internal exhaust pipe and the sill beam into a limited-amplitude movable connection, preventing the sill beam from resonating due to the internal exhaust pipe and improving the overall NVH performance of the vehicle. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 This is a partial structural cross-sectional view of the lower vehicle body structure in an embodiment of this application;

[0027] Figure 2 This is a perspective view of the lower vehicle body structure in the embodiments of this application;

[0028] Figure 3 This is a schematic diagram of the internal structure of the lower vehicle body structure without the sill beam in the embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the limiting connection component structure of the lower vehicle body structure in an embodiment of this application;

[0030] Figure 5 for Figure 4 A structural diagram from another perspective;

[0031] Figure 6 This is a schematic diagram of the heat insulation plate structure of the lower vehicle body structure in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the first connecting member structure of the lower vehicle body structure in an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures

[0034] 100. Door sill beam; 200. Internal exhaust pipe; 300. External exhaust pipe;

[0035] 400. Limiting connection component;

[0036] 401. First connector; 4011. First snap-fit ​​part; 4012. First main body part; 4013. First connecting part; 4014. Annular boss;

[0037] 402. Second connector; 4021. Second snap-fit ​​part;

[0038] 403. Movable pad; 4031. Opening; 4032. Mounting groove; 4033. Clearance groove; 4034. Stand;

[0039] 501. Inner mounting plate; 502. Outer mounting plate;

[0040] 600. Insulation board; 601. Reinforcing rib;

[0041] 700. Heat dissipation vents.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0047] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0048] As mentioned in the background section, there are currently designs on the market that conceal the exhaust pipe within the door sill beam, reducing the space occupied by the exhaust pipe. However, the exhaust pipe experiences slight vibrations due to the vibrations transmitted from the engine, which can cause the exhaust pipe within the door sill beam to resonate, affecting the overall noise, vibration, and harshness (NVH) performance of the vehicle.

[0049] Based on the above description, one or more embodiments of this application provide a lower body structure and a vehicle. The following describes the solutions of the embodiments of this application in conjunction with the accompanying drawings.

[0050] like Figure 1 and Figure 2 As shown, this application embodiment provides a lower body structure, including a sill beam 100, an internal exhaust pipe 200, an external exhaust pipe 300, and a limiting connection assembly 400.

[0051] The sill beam 100 has an internal cavity, and one side of the sill beam 100 has an opening that connects to the cavity. The internal exhaust pipe 200 is located in the cavity, and the external exhaust pipe 300 is located on one side of the sill beam 100 and connects to the internal exhaust pipe 200 through the opening. The limiting connection assembly 400 is located in the cavity, and the sill beam 100 and the internal exhaust pipe 200 are connected by the limiting connection assembly 400. The limiting connection assembly 400 is configured to extend and retract in a preset direction when the internal exhaust pipe 200 vibrates, so that the internal exhaust pipe 200 is displaced relative to the sill beam 100.

[0052] As can be seen from the above description, in the lower body structure of this application embodiment, the sill beam 100 is provided with a receiving cavity, and the internal exhaust pipe 200 is located in the receiving cavity, thereby hiding the exhaust pipe in the sill beam 100, reducing the space occupied by the exhaust pipe, avoiding interference between the exhaust pipe and the horizontally arranged battery pack, which is beneficial to improving the battery capacity of the battery pack and the overall vehicle range.

[0053] Furthermore, the limiting connection assembly 400 connects the sill beam 100 and the internal exhaust pipe 200. On the one hand, it can enhance the connection strength of the internal exhaust pipe 200 in the sill beam 100. On the other hand, the limiting connection assembly 400 can extend and retract in a preset direction when the internal exhaust pipe 200 vibrates, so that the internal exhaust pipe 200 is displaced relative to the sill beam 100. This allows the internal exhaust pipe 200 to move to a certain extent relative to the sill beam 100 in a preset direction when vibrating. The limiting connection assembly 400 transforms the rigid connection between the internal exhaust pipe 200 and the sill beam 100 into a movable connection with limited displacement, avoiding the sill beam 100 from being driven to resonate by the internal exhaust pipe 200, which is beneficial to improving the overall NVH performance of the vehicle.

[0054] In the embodiments of this application, the vehicle mentioned can be a hybrid vehicle or a gasoline vehicle. In a hybrid vehicle, both an engine and a battery pack are present, and the exhaust pipe and battery pack are arranged side by side. Therefore, hiding the exhaust pipe in the sill beam 100 can effectively maximize the space of the battery pack. In a gasoline vehicle, the exhaust pipe is also arranged under the vehicle chassis. For some models with a compact layout, the lateral space occupied by the exhaust pipe may affect the flatness of the entire chassis and interfere with components such as the fuel tank and transmission frame. Therefore, hiding the exhaust pipe in the sill beam 100 can effectively reduce the space occupied by the exhaust pipe in the chassis.

[0055] Here, hybrid vehicles are used as an example in the embodiments of this application.

[0056] It should be noted that the directional terms such as "horizontal", "vertical", "inner side" and "outer side" mentioned in the embodiments of this application are all described with reference to the orientation of the lower body structure after it is assembled to the vehicle body. Generally speaking, the power battery pack is located on the side of the sill beam 100 facing the inside of the vehicle, and the external exhaust pipe 300 is located on the side of the internal exhaust pipe 200 facing the inside of the vehicle.

[0057] The sill beam 100 of a vehicle is usually a closed cavity formed by metal stamping or welding. The cross section of the sill beam 100 can be "U" shaped or "U" shaped, and the reserved cavity inside can be used to install the internal exhaust pipe 200.

[0058] like Figure 3 and Figure 4 As shown in the embodiment of this application, the limiting connection component 400 includes a first connector 401, a second connector 402, and a movable pad 403.

[0059] The first connector 401 is connected to the side wall of the sill beam 100; the second connector 402 is connected to the side wall of the internal exhaust pipe 200; both the first connector 401 and the second connector 402 are inserted into the movable pad 403, and at least one of the first connector 401 and the second connector 402 can extend and retract within the movable pad 403.

[0060] In the above embodiments, the first connector 401 and the second connector 402 can be integrated metal components. The first connector 401 of the limiting connection assembly 400 can be a bent hook. The shape of the first connector 401 is "L". The first connector 401 includes a first main body portion 4012 extending in the vertical direction and a first connecting portion 4013 extending in the horizontal direction. The first main body portion 4012 is used to connect with the movable pad 403, and the first connecting portion 4013 is used to connect with the inner sidewall of the vehicle sill beam 100.

[0061] Generally, such as Figure 7 As shown, an annular boss 4014 for preventing the movable pad 403 from moving upward is also constructed on the first main body 4012. The distance between the annular boss 4014 and the first locking part 4011 is slightly larger than the overall thickness of the movable pad 403. That is, the difference between the distance between the annular boss 4014 and the first locking part 4011 and the overall thickness of the movable pad 403 is the extension stroke of the movable pad 403. By adjusting the distance between the annular boss 4014 and the first locking part 4011, the vibration amplitude of the movable pad 403 can be adjusted, thereby preventing the internal exhaust pipe 200 from vibrating too much and causing the sill beam to resonate.

[0062] Here, the first connecting portion 4013 of the first connector 401 can be fixedly connected to the sill beam 100 by welding. The first connector 401 can be configured as two parallel ones, thereby further improving the connection effect between the first connector 401 and the movable pad 403 and avoiding failure and breakage of the first connector 401 under long-term vibration of the internal exhaust pipe 200.

[0063] In the above embodiments, the second connector 402 of the limiting connection assembly 400 can be configured as a bent hook with reference to the structure of the first connector 401. The shape of the second connector 402 is "L". The second connector 402 includes a second main body extending in the vertical direction and a second connecting part extending in the horizontal direction. The second main body is used to connect with the movable pad 403, and the second connecting part is used to connect with the side wall of the internal exhaust pipe 200.

[0064] Here, the second connecting part of the second connector 402 can be fixedly connected to the side wall of the internal exhaust pipe 200 by welding or threading.

[0065] It should be noted that in some embodiments, the second connecting part of the second connector 402 extending horizontally is overlapped and welded to the bottom of the inner exhaust pipe 200. That is, when the second connector 402 is connected to the movable pad 403, the second connecting part can be used to hook the inner exhaust pipe 200. This setting can further improve the supporting and fixing effect of the limiting connection component 400 on the inner exhaust pipe 200, and assist in fixing the inner exhaust pipe 200 in the sill beam 100.

[0066] Furthermore, the first connector 401 has a first locking portion 4011 on the side facing the inner exhaust pipe 200, which is used to prevent the first connector 401 from disengaging from the movable pad 403; the second connector 402 has a second locking portion 4021 on the side away from the inner exhaust pipe 200, which is used to prevent the second connector 402 from disengaging from the movable pad 403.

[0067] For example, the movable pad 403 is provided with an opening 4031, which penetrates the movable pad 403 in the radial direction of the internal exhaust pipe 200. The first connector 401 passes through the opening 4031 and can reciprocate and extend along the axial direction of the opening 4031. The first snap-fit ​​part 4011 is an elastic snap-fit ​​head that snaps into the opening 4031.

[0068] like Figure 5 As shown, in the above embodiment, the opening 4031 of the movable pad 403 is a through hole arranged in the vertical direction of the vehicle. The first snap-fit ​​part 4011 can be an outwardly expanding elastic snap-fit ​​head as shown in the figure. The end of the elastic snap-fit ​​head is a conical head. When the first connector 401 is penetrated by external force through the opening 4031, the elastic snap-fit ​​head is first compressed into the opening 4031. After penetrating the opening 4031, it forms a snap-fit ​​with the opening, preventing the first connector 401 from detaching from the movable pad 403.

[0069] Since one end of the first connector 401 is fixedly connected to the side wall of the sill beam 100, under the tension of the inner exhaust pipe 200, the first snap-fit ​​part 4011 and the movable pad 403 are in a snap-fit ​​fixed state. When the inner exhaust pipe 200 vibrates up and down, the movable pad 403 vibrates up and down with the inner exhaust pipe 200, causing the first main body 4012 to move up and down in the opening part 4031, absorbing the vibration force of the inner exhaust pipe 200 and reducing the vibration impact of the inner exhaust pipe 200 on the sill beam 100. Through the relative expansion and contraction of the first main body 4012 and the opening part 4031, the buffering failure problem caused by material aging, tearing, etc., when using flexible pads to buffer vibration in traditional solutions can also be avoided.

[0070] In the above embodiment, the movable pad 403 is provided with a mounting groove 4032, and the end of the second snap-fit ​​part 4021 facing away from the inner exhaust pipe 200 is snapped into the mounting groove 4032.

[0071] Specifically, the mounting groove 4032 is a semi-closed blind groove. The side wall of the mounting groove 4032 is constructed with a stop 4034 for engaging with the second snap-fit ​​part 4021. An open clearance groove 4033 is provided on each of the opposite sides of the mounting groove 4032. The structure of the second snap-fit ​​part 4021 can be set with reference to the structure of the first snap-fit ​​part, that is, it is an outwardly expanding elastic snap head. The second snap-fit ​​part 4021 enters the mounting groove 4032 through the clearance groove 4033 and engages with the stop 4034 of the mounting groove 4032 to form the connection between the second connector 402 and the movable pad 403.

[0072] In the above embodiment, a clearance groove 4033 is provided on each side of the mounting groove 4032. The opening size of the clearance groove 4033 is larger than the size of the mounting groove 4032, so as to facilitate the transition of the second snap-fit ​​part 4021 into the mounting groove 4032. Furthermore, the two clearance grooves 4033 are symmetrically arranged relative to the mounting groove 4032. Thus, the symmetrically arranged mounting groove 4032 can avoid the aggravation of vibration caused by the displacement of the center of mass of the movable pad 403, thereby helping the movable pad 403 to maintain a stable buffering and vibration absorption effect.

[0073] The movable pad 403 in this embodiment may be made of an elastic material, such as rubber or rubber-metal composite material, but this is not an absolute limitation in this embodiment.

[0074] For example, the aforementioned preset direction is the up-down direction. Since the vibration direction of the exhaust pipe is mostly up-down, the up-down extension and retraction of the first connector 401 in the movable pad 403 can effectively reduce the vibration impact of the exhaust pipe in the up-down direction. The movable pad 403, made of elastic material, can further buffer and absorb the vibration of the exhaust pipe in other directions, thereby reducing the vibration effect of the exhaust pipe on the sill beam 100.

[0075] In some embodiments, such as Figure 1 and Figure 2 As shown, the inner exhaust pipe 200 is connected to an inner mounting plate 501 at one end facing the opening, and the outer exhaust pipe 300 is connected to an outer mounting plate 502 at one end facing the opening. The inner mounting plate 501, the outer mounting plate 502, and at least part of the side wall of the sill beam 100 are connected.

[0076] In the above embodiment, the sill beam 100 has two openings facing the inside of the vehicle, and the two ends of the inner exhaust pipe 200 are respectively connected to the two outer exhaust pipes 300 through one opening. Taking one end of the inner exhaust pipe 200 as an example, the inner mounting plate 501, the outer mounting plate 502 and the side wall of the sill beam 100 can be fixedly connected by bolts that pass through them. Elastic washers are provided between the inner mounting plate 501 and the inner side wall of the sill beam 100, and between the outer mounting plate 502 and the outer side wall of the sill beam 100, so as to absorb the vibration force of the exhaust pipe and reduce the vibration impact of the exhaust pipe on the sill beam 100.

[0077] like Figure 3 and Figure 6 As shown, in some embodiments, the lower body structure further includes a heat dissipation opening 700 and a heat insulation plate 600 disposed in the sill beam 100. The heat insulation plate 600 is disposed in the receiving cavity and extends along the length of the sill beam 100. The heat insulation plate 600 is located on the side of the inner exhaust pipe 200 away from the outer exhaust pipe 300. The heat dissipation opening 700 is disposed on the side of the sill beam 100 facing the outer exhaust pipe 300 and is used to output the heat generated by the inner exhaust pipe 200.

[0078] In the above embodiments, the heat insulation plate 600 can be made of high-temperature resistant heat insulation material. The surface of the heat insulation plate 600 is coated with a high-temperature resistant coating. The heat insulation plate 600 is fixed to the inner wall of the sill beam 100 by means of snap-fit ​​or adhesive. The heat insulation plate 600 blocks the heat radiation and heat conduction of the inner exhaust pipe 200, avoids the heat transmission of the exhaust pipe to the sill beam 100, and improves the riding comfort of the passenger cabin.

[0079] For example, the heat insulation panel 600 is snapped into the internal exhaust pipe 200, and the heat insulation panel 600 is provided with reinforcing ribs 601. The side of the heat insulation panel 600 facing the internal exhaust pipe 200 is provided with ribs that fit into the internal exhaust pipe 200. The reinforcing ribs 601 and ribs can further improve the structural strength of the heat insulation panel 600, so that the heat insulation panel 600 can also serve the functions of supporting the sill beam 100 and insulating heat.

[0080] In the above embodiment, the heat dissipation opening 700 is located on the side of the sill beam 100 facing the external exhaust pipe 300. Utilizing the principle of pressure difference, the heat in the containment cavity is discharged through the heat dissipation opening 700 during vehicle movement, exchanging heat with the outside and reducing the temperature of the internal exhaust pipe 200 inside the sill beam 100. Generally, the heat dissipation opening 700 can be a circular hole or an elongated hole, with multiple openings spaced apart without affecting the structural strength of the sill beam 100, to maximize heat exchange efficiency.

[0081] For example, the heat insulation panel 600 has a plurality of spaced-apart openings along the length of the sill beam 100; the heat dissipation openings 700 have a plurality of spaced-apart openings along the length of the sill beam 100. This design can maximize the heat exchange efficiency between the internal exhaust pipe 200 and the outside environment.

[0082] Another embodiment of this application provides a vehicle, including a vehicle body and a lower body structure disposed on the vehicle body as described in any of the above embodiments.

[0083] Since the vehicle includes the underbody structure of any of the above embodiments, it has all the advantages of an underbody structure.

[0084] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0085] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A lower vehicle body structure characterized by comprising: include: A sill beam has an internal cavity, and one side of the sill beam has an opening that communicates with the cavity; An internal exhaust pipe and an external exhaust pipe are provided. The internal exhaust pipe is located in the receiving cavity, and the external exhaust pipe is located on one side of the sill beam and communicates with the internal exhaust pipe through the opening. A limiting connection assembly is disposed in the receiving cavity. The sill beam and the inner exhaust pipe are connected through the limiting connection assembly. The limiting connection assembly is configured to extend and retract in a preset direction when the inner exhaust pipe vibrates, so as to displace the inner exhaust pipe relative to the sill beam.

2. The lower car body structure according to claim 1, characterized by The limiting connection component includes: The first connector is connected to the side wall of the sill beam; The second connector is connected to the side wall of the internal exhaust pipe; A movable pad, wherein both the first connector and the second connector are inserted into the movable pad, and at least one of the first connector and the second connector is capable of telescoping within the movable pad.

3. The lower car body structure according to claim 2, characterized by The first connector has a first locking part on the side facing the internal exhaust pipe, which is used to prevent the first connector from disengaging from the movable pad. The second connector has a second locking part on the side opposite to the internal exhaust pipe, which is used to prevent the second connector from disengaging from the movable pad.

4. The lower car body structure according to claim 3, characterized by The movable pad is provided with an opening, which penetrates the movable pad in the radial direction of the internal exhaust pipe. The first connector passes through the opening and can reciprocate and extend along the axial direction of the opening. The first snap-fit ​​part is an elastic snap-fit ​​head that snaps into the opening.

5. The lower car body structure according to claim 4, characterized by The movable pad is provided with a mounting groove, and the end of the second snap-fit ​​part opposite to the internal exhaust pipe snaps into the mounting groove.

6. The undercar body structure according to any one of claims 1 to 5, characterized by, An inner mounting plate is connected to one end of the inner exhaust pipe facing the opening, and an outer mounting plate is connected to one end of the outer exhaust pipe facing the opening. The inner mounting plate, the outer mounting plate, and at least a portion of the sidewall of the sill beam are connected.

7. The lower car body structure according to any one of claims 1 to 5, characterized by, Also includes: A heat insulation plate is disposed in the receiving cavity, the heat insulation plate is arranged to extend along the length direction of the threshold beam, and the internal exhaust pipe is located between the heat insulation plate and the opening; A heat dissipation opening is provided on the side of the sill beam facing the external exhaust pipe, and the heat dissipation opening is used to output the heat generated by the internal exhaust pipe.

8. The lower car body structure according to claim 7, characterized by The heat insulation plate is snapped into the internal exhaust pipe, and the heat insulation plate is provided with reinforcing ribs.

9. The lower car body structure according to claim 7, characterized by The heat insulation plate has a plurality of spaced-apart openings along the length of the sill beam; the heat dissipation openings have a plurality of spaced-apart openings along the length of the sill beam.

10. A vehicle characterized by comprising: It includes a vehicle body and a lower body structure provided on the vehicle body according to any one of claims 1 to 9.

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