Lower vehicle body framework and vehicle

Abstract

The utility model relates to the technical field of vehicles, and discloses a lower vehicle body framework and a vehicle. The lower vehicle body framework comprises a rear auxiliary frame, an electric drive assembly, a battery pack, an oil tank and a carbon tank; the rear auxiliary frame comprises a first cross beam; the electric drive assembly is installed on the rear auxiliary frame and located behind the first cross beam in the first direction. The electric drive assembly comprises a motor and a speed reducer, and the motor is located behind the speed reducer in the first direction. The battery pack is located in front of the first cross beam in the first direction; the oil tank is positioned behind the battery pack in a first direction; the carbon tank is located between the oil tank and the first cross beam in the first direction and communicated with the oil tank. The problem that the arrangement space of the fuel tank is limited by the first cross beam in the first direction and occupied by the carbon tank in the second direction is solved remarkably, capacity expansion of the volume of the fuel tank can be achieved on the premise that large battery pack configuration is maintained, and the comprehensive cruising ability of the whole vehicle is improved.

Description

Technical Field

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

[0002] Currently, new energy vehicles mainly include battery electric vehicles (BEVs), plug-in hybrid electric vehicles (PHEVs), and range-extended electric vehicles (REEVs). Among them, a range-extended electric vehicle is a new energy vehicle that uses a power battery as its primary driving energy source. When the battery is fully charged, it relies entirely on electricity for propulsion; when the battery level drops to a set threshold, an onboard range extender is activated to generate electricity, providing power to the drive system or battery. The range extender typically consists of a small internal combustion engine and a generator, while the fuel required for the internal combustion engine to operate is stored in a fuel tank. Therefore, the fuel tank, as a key component of the range-extending system, directly affects the vehicle's range capability in range-extended mode.

[0003] In a range-extended electric vehicle, the lower body structure is the core area integrating key power and energy systems, mainly including the rear subframe, electric drive assembly, battery pack, fuel tank, and carbon canister. The rear subframe has a front crossbeam, on which the electric drive assembly is mounted, with its output connected to the rear wheels for rear-wheel drive. The battery pack is located in front of the front crossbeam for storing electrical energy. The fuel tank is located between the front crossbeam and the battery pack for storing fuel. The carbon canister is located adjacent to the fuel tank, on its lateral side, for adsorbing and desorbing fuel vapors.

[0004] Currently, to improve pure electric driving range, the industry generally adopts a solution of increasing the X-axis dimension of the battery pack, which significantly compresses the longitudinal (X-axis) layout space in front of the fuel tank. Furthermore, rear-wheel-drive electric drive assemblies typically use a forward-tilted layout (i.e., the motor body is located in front of the reducer), causing the front crossbeam of the rear subframe to be positioned relatively forward, adjacent to the rear of the fuel tank, further squeezing the longitudinal (X-axis) layout space behind the fuel tank. Simultaneously, the carbon canister is usually located on the lateral (Y-axis) side of the fuel tank, directly occupying the available lateral width of the fuel tank. The combination of these factors results in the fuel tank's layout space being doubly restricted in the X-axis by the battery pack and the front crossbeam of the rear subframe, and encroached upon in the Y-axis by the carbon canister, forcing a reduction in fuel tank volume and consequently limiting the overall vehicle range. Therefore, a new type of underbody architecture is urgently needed that can effectively free up usable fuel tank space and increase its volume while maintaining a large battery pack configuration. Utility Model Content

[0005] This application provides a lower body structure and vehicle that can expand the fuel tank capacity while maintaining a large battery pack configuration, thereby improving the overall range of the vehicle.

[0006] To achieve the above objectives, the main technical solutions adopted in this application include:

[0007] In a first aspect, embodiments of this application provide a lower body structure, including:

[0008] Rear subframe, including the first crossbeam;

[0009] An electric drive assembly is mounted on the rear subframe and is located behind the first crossbeam in a first direction; the electric drive assembly includes a motor and a reducer, and the motor is located behind the reducer in the first direction;

[0010] The battery pack is located in front of the first crossbeam in the first direction;

[0011] The fuel tank is located behind the battery pack in the first direction;

[0012] A carbon canister is located in a first direction between the oil tank and the first crossbeam, and is in communication with the oil tank;

[0013] The first direction refers to the forward and backward direction of the vehicle.

[0014] The vehicle body structure proposed in this application adopts a rearward-folding arrangement of the electric drive assembly, causing its overall front-end profile to contract rearward in the first direction. This allows the position of the first crossbeam to be moved rearward accordingly in the first direction, effectively freeing up the arrangement space of the fuel tank behind it in the first direction. At the same time, by changing the traditional Y-axis side-mounted carbon canister to be arranged within the gap between the fuel tank and the first crossbeam in the first direction, the arrangement space of the fuel tank in the second direction is avoided. Thus, the problem of the fuel tank's arrangement space being restricted by the first crossbeam in the first direction and encroached upon by the carbon canister in the second direction is significantly alleviated. Under the premise of maintaining a large battery pack configuration, the fuel tank volume can be expanded, thereby improving the overall range of the vehicle.

[0015] Optionally, the battery pack has a high-voltage wiring harness interface on the side near the fuel tank, and the high-voltage wiring harness interface is located outside the fuel tank in a second direction; a high-voltage wiring harness is connected to the high-voltage wiring harness interface, and the high-voltage wiring harness is arranged along the side edge of the fuel tank and connected to the electric drive assembly; the second direction refers to the left-right direction of the vehicle.

[0016] In the above solution, by setting the high-voltage harness interface on the side of the battery pack near the fuel tank and on the outside of the fuel tank in the second direction, the high-voltage harness leading out from the high-voltage harness interface runs along the side edge of the fuel tank. Compared with the traditional solution of running the harness on the top of the fuel tank, this avoids the height encroachment in the third direction caused by the high-voltage harness crossing the top of the fuel tank in the traditional solution. This effectively frees up the space for the fuel tank in the third direction, further increases the volume of the fuel tank, and improves the overall range of the vehicle.

[0017] Optionally, it also includes a floor, the floor having a second crossbeam above the carbon canister in a third direction, the carbon canister being mounted on the second crossbeam; the third direction refers to the vertical direction of the vehicle.

[0018] In the above solution, by installing the carbon canister on the second crossbeam of the floor, the rigid support structure of the floor can be fully utilized, so that the second crossbeam provides a stable mounting base for the carbon canister, which is beneficial to improving assembly reliability and vibration durability.

[0019] Optionally, an integrated bracket extending in a second direction is provided between the fuel tank and the carbon canister; the integrated bracket is fixed on the second crossbeam, and a carbon canister bracket for fixing the carbon canister is provided on the integrated bracket.

[0020] In the above solution, by setting an integrated bracket extending in the second direction in the gap between the fuel tank and the carbon canister, and integrating the carbon canister bracket thereon, the integration of the lower body structure components can be effectively improved, the assembly process on the production line can be simplified, and the assembly efficiency can be improved.

[0021] Optionally, the system further includes a high-voltage wiring harness fixing assembly, which includes a first fixing bracket, a second fixing bracket, and a third fixing bracket. The high-voltage wiring harness includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. The first connecting segment extends from the high-voltage wiring harness interface and is located on the side of the fuel tank. The second connecting segment bends from the first connecting segment, is located between the fuel tank and the carbon canister, and extends along a second direction. The third connecting segment bends from the second connecting segment, is located on the side of the carbon canister, and is connected to the electric drive assembly. The first fixing bracket is disposed on the fuel tank and is used to fix the first connecting segment. The second fixing bracket and the third fixing bracket are respectively disposed on the left and right sides of the integrated bracket in the second direction and are used to fix the second connecting segment.

[0022] In the above scheme, by rationally planning the routing path of the high-voltage harness, it extends backward along the side of the fuel tank after being led out from the battery pack, then laterally crosses the gap between the fuel tank and the carbon canister, and then goes around to the outside of the carbon canister to connect to the electric drive assembly. This path avoids the top area of ​​the fuel tank (because the top is in contact with the front floor of the vehicle body and there is no space for wiring) and the bottom area (because the ground clearance is small and it is easily scratched by road protrusions). It makes use of the narrow space in the lower body structure, and the layout is more compact and reasonable. It can achieve a safe and feasible electrical connection under the limited vehicle layout conditions. On this basis, by setting the first fixed bracket, the second fixed bracket and the third fixed bracket to fix the key sections, the shaking and displacement of the high-voltage harness during vehicle operation are effectively suppressed, so that the high-voltage harness remains in a non-contact state with the fuel tank throughout the process. This effectively avoids the risk of insulation wear or heat conduction caused by long-term vibration and friction, and improves electrical safety and long-term reliability.

[0023] Optionally, the integrated bracket is a "U"-shaped bracket, with a first connecting part and a second connecting part on the side near the floor; the first connecting part extends along a first direction and is connected to the second crossbeam along a third direction; the second connecting part extends along a third direction and is connected to the second crossbeam along the first direction; the carbon canister bracket, the second fixed bracket, and the third fixed bracket are located on the side of the integrated bracket away from the floor, and the carbon canister bracket is located on the side near the carbon canister in the first direction, while the second fixed bracket and the third fixed bracket are located on the side near the fuel tank in the first direction.

[0024] In the above solution, by adopting the integrated bracket with a "U"-shaped structure and providing a first connecting part extending along a first direction and a second connecting part extending along a third direction at its bottom, the first connecting part is fixed to the second crossbeam along the third direction, and the second connecting part is fixed to the second crossbeam along the first direction. This achieves a rigid connection between the integrated bracket and the second crossbeam in two orthogonal directions, significantly improving the torsional and vibration resistance of the overall installation structure. At the same time, the integrated bracket integrates the installation function of the carbon canister and the fixing function of the high-voltage wire harness on the same structure, achieving highly integrated assembly while effectively avoiding spatial interference that may occur due to the arrangement of multiple independent brackets.

[0025] Optionally, the fuel tank is connected to a refueling pipe on the side near the carbon canister, and the refueling pipe is located at one end of that side in a second direction near the third connecting section; the bottom of the fuel tank is provided with at least one fuel tank fixing bracket with an upward opening, and the top of the fuel tank fixing bracket is connected to the floor via a connector in a third direction to fix the fuel tank to the floor.

[0026] In the above solution, by arranging the refueling pipe on the side of the fuel tank near the carbon canister and at one end of that side near the third connecting section in the second direction, the space of the outer area of ​​the carbon canister in the second direction can be fully utilized, resulting in a more compact and reasonable arrangement. In addition, by using the fuel tank fixing bracket with the opening facing upward to support the fuel tank from below, a strong supporting rigidity can be provided to the fuel tank in the third direction, thereby fixing the fuel tank. Moreover, this fixing method does not require drilling or welding on the fuel tank shell, reducing the risk of leakage and facilitating the overall disassembly and maintenance of the fuel tank.

[0027] Optionally, the carbon canister is connected to a first fuel pipe, a second fuel pipe, and a vent pipe at one end in the second direction near the third connecting section, and the first fuel pipe, the second fuel pipe, and the vent pipe are located above the third connecting section and the refueling pipe in the third direction.

[0028] In the above solution, by uniformly arranging the first fuel pipe, the second fuel pipe, and the vent pipe above the third connecting section and the refueling pipe, a clear upper and lower layered structure is formed, avoiding contact or interference with the high-voltage wiring harness and refueling pipe below, thus optimizing the pipeline management of the entire vehicle and improving the compactness of the layout and the reliability of the system in the lower vehicle area.

[0029] Optionally, at least one fuel pipe bracket is provided on the outer edge of the fuel tank for fixing the first fuel pipe and the second fuel pipe.

[0030] In the above solution, by setting at least one fuel pipe bracket for fixing the first fuel pipe and the second fuel pipe on the outer edge of the fuel tank, the first fuel pipe and the second fuel pipe are firmly constrained on the side of the fuel tank, making the wiring more stable and reliable. At the same time, the structural rigidity of the fuel tank body is fully utilized as the pipeline support foundation, eliminating the need for additional independent brackets or occupying the mounting points under the floor, simplifying the assembly process and improving the integration of components in the lower vehicle body area.

[0031] Secondly, embodiments of this application provide a vehicle including the aforementioned underbody structure.

[0032] The vehicle proposed in this application adopts a rearward-folding arrangement for the electric drive assembly, causing its overall front-end profile to contract rearward in the first direction. This allows the position of the first crossbeam to be moved rearward accordingly in the first direction, effectively freeing up the arrangement space of the fuel tank behind it in the first direction. At the same time, by changing the traditional Y-axis side-mounted carbon canister to be arranged within the gap between the fuel tank and the first crossbeam in the first direction, the arrangement space of the fuel tank in the second direction is avoided. Thus, the problem of the fuel tank's arrangement space being restricted by the first crossbeam in the first direction and encroached upon by the carbon canister in the second direction is significantly alleviated. Under the premise of maintaining a large battery pack configuration, the fuel tank volume can be expanded, thereby improving the overall range of the vehicle. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the overall structure of the lower vehicle body architecture in some embodiments of this application. Figure 1 ;

[0035] Figure 2 This is a schematic diagram of the overall structure of the lower vehicle body architecture in some embodiments of this application. Figure 2 ;

[0036] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0037] Figure 4 This is a schematic diagram of the integrated bracket structure in some embodiments of this application.

[0038] [Explanation of Labels in the Attached Image]

[0039] X: First direction;

[0040] Y: Second direction;

[0041] Z: Third-party direction;

[0042] 1: Rear subframe; 11: First crossbeam;

[0043] 2: Electric drive assembly; 21: Motor; 22: Reducer;

[0044] 3: Battery pack; 31: High-voltage harness interface; 32: High-voltage harness; 321: First connecting section; 322: Second connecting section; 323: Third connecting section; 33: High-voltage harness fixing assembly; 331: First fixing bracket; 332: Second fixing bracket; 333: Third fixing bracket;

[0045] 4: Fuel tank; 41: Fuel filler hose; 42: Fuel tank mounting bracket; 43: Fuel hose bracket;

[0046] 5: Carbon canister; 51: Carbon canister support; 52: First fuel line; 53: Second fuel line; 54: Vent pipe;

[0047] 6: Floor; 61: Second crossbeam;

[0048] 7: Integrated bracket; 71: First connecting part; 72: Second connecting part. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0051] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0053] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0055] In range-extended electric vehicles (REEVs), the lower body structure is the core area integrating key power and energy systems, mainly including the rear subframe, electric drive assembly, battery pack, fuel tank, and carbon canister. The rear subframe has a front crossbeam, on which the electric drive assembly is mounted, with its output connected to the rear wheels for rear-wheel drive. The battery pack is located in front of the front crossbeam for storing electrical energy. The fuel tank is located between the front crossbeam and the battery pack for storing fuel. The carbon canister is located adjacent to the fuel tank, on its lateral side, for adsorbing and desorbing fuel vapors. Currently, to improve pure electric range, the industry generally adopts a solution of increasing the X-axis dimension of the battery pack, resulting in a significant compression of the longitudinal (X-axis) layout space in front of the fuel tank. Based on this, rear-wheel drive electric drive assemblies generally adopt a forward-tilted arrangement (i.e., the motor body is located in front of the reducer), which makes the front crossbeam of the rear subframe relatively forward, close to the rear of the fuel tank, further squeezing the longitudinal (X-direction) layout space behind the fuel tank. At the same time, the carbon canister is usually located on the lateral (Y-direction) side of the fuel tank, directly occupying the available width of the fuel tank in the lateral direction. The combination of these factors results in the fuel tank's layout space being doubly restricted in the X-direction by the battery pack and the front crossbeam of the rear subframe, and encroached upon in the Y-direction by the carbon canister, forcing a reduction in the fuel tank volume, and thus limiting the overall driving range of the vehicle.

[0056] Therefore, in order to maintain a large battery pack configuration while expanding the fuel tank capacity and improving the overall vehicle range, this application provides a lower body structure, defining the vehicle's forward / backward direction as the first direction X, the vehicle's left / right direction as the second direction Y, and the vehicle's up / down direction as the third direction Z, such as... Figure 1 , Figure 2 , Figure 3 As shown, the lower body structure includes a rear subframe 1, an electric drive assembly 2, a battery pack 3, a fuel tank 4, and a carbon canister 5, wherein:

[0057] The rear subframe 1 is located at the rear of the vehicle and includes a first crossbeam 11;

[0058] The electric drive assembly 2 is mounted on the rear subframe 1 and is located behind the first crossbeam 11 in the first direction X; the electric drive assembly 2 includes a motor 21 and a reducer 22, and the motor 21 is located behind the reducer 22 in the first direction X, forming a rear-tilting arrangement; the electric drive assembly 2 is used to realize rear-wheel drive.

[0059] The battery pack 3 is located in front of the first crossbeam 11 in the first direction X, and is used to store electrical energy;

[0060] The fuel tank 4 is located behind the battery pack 3 in the first direction X and is used to store fuel.

[0061] The carbon canister 5 is located between the oil tank 4 and the first crossbeam 11 in the first direction X, and is connected to the oil tank 4, for adsorbing and desorbing fuel vapor.

[0062] The vehicle body structure proposed in this application adopts a rearward-folding arrangement for the electric drive assembly 2, causing its overall front-end profile to contract rearward in the first direction X. This allows the position of the first crossbeam 11 to be moved rearward accordingly in the first direction X, effectively freeing up the arrangement space of the fuel tank 4 behind in the first direction X. At the same time, by changing the traditional side-mounted position of the carbon canister 5 in the Y direction to be arranged within the gap between the fuel tank 4 and the first crossbeam 11 in the first direction X, the arrangement space of the fuel tank 4 in the second direction Y is avoided. Thus, the problem of the arrangement space of the fuel tank 4 being restricted by the first crossbeam 11 in the first direction X and encroached upon by the carbon canister 5 in the second direction Y is significantly alleviated. Under the premise of maintaining a large battery pack configuration, the volume of the fuel tank 4 can be expanded, thereby improving the overall range of the vehicle.

[0063] In other embodiments, the battery pack 3 has a high-voltage wiring harness interface 31 on the side near the fuel tank 4, and the high-voltage wiring harness interface 31 is located on the outside of the fuel tank 4 in the second direction Y (e.g., the left or right side); a high-voltage wiring harness 32 is connected to the high-voltage wiring harness interface 31, and the high-voltage wiring harness 32 extends rearward along the side edge of the fuel tank 4 after being led out from the high-voltage wiring harness interface 31, and is connected to the electric drive assembly 2 for transmitting the high-voltage electrical energy output by the battery pack 3 to the electric drive assembly 2 to drive the vehicle.

[0064] In the above solution, by setting the high-voltage wiring harness interface 31 on the side of the battery pack 3 close to the fuel tank 4 and located on the outside of the fuel tank 4 in the second direction Y, the high-voltage wiring harness 32 leading out from the high-voltage wiring harness interface 31 runs along the side edge of the fuel tank 4. Compared with the traditional solution of running the wiring on the top of the fuel tank 4, this avoids the height encroachment in the third direction Z caused by the high-voltage wiring harness 32 crossing the top of the fuel tank 4 in the traditional solution. This effectively releases the arrangement space of the fuel tank 4 in the third direction Z, further increases the volume of the fuel tank 4, and improves the overall range of the vehicle.

[0065] In other embodiments, the underbody structure further includes a floor 6 located at the bottom of the vehicle body, and a second crossbeam 61 is provided above the carbon canister 5 along the third direction Z; the second crossbeam 61 is a transverse support beam fixed to the floor 6, which extends along the second direction Y and is fixedly connected to the floor 6 by bolts or welding; the carbon canister 5 is directly or indirectly installed below the second crossbeam 61.

[0066] In the above scheme, by installing the carbon canister 5 on the second crossbeam 61 on the floor 6, the rigid support structure of the floor 6 can be fully utilized, so that the second crossbeam 61 provides a stable mounting base for the carbon canister 5, which is beneficial to improving assembly reliability and vibration durability.

[0067] In some other embodiments, an integrated bracket 7 extending along the second direction Y is provided between the oil tank 4 and the carbon canister 5; the integrated bracket 7 is fixed on the second crossbeam 61, specifically, it can be fixed on the second crossbeam 61 by means of bolts or welding, etc., which is not limited here; the integrated bracket 7 is provided with a carbon canister bracket 51 for fixing the carbon canister 5, which can securely install the carbon canister 5 on it.

[0068] In the above solution, by setting an integrated bracket 7 extending along the second direction Y in the gap between the oil tank 4 and the carbon canister 5, and integrating the carbon canister bracket 51 on it, the integration of the components of the lower body structure can be effectively improved, the assembly process of the production line can be simplified, and the assembly efficiency can be improved.

[0069] In other embodiments, the lower body structure further includes a high-voltage wiring harness fixing assembly 33, which includes a first fixing bracket 331, a second fixing bracket 332, and a third fixing bracket 333; the high-voltage wiring harness 32 includes a first connecting segment 321, a second connecting segment 322, and a third connecting segment 323 connected in sequence; the first connecting segment 321 extends from the high-voltage wiring harness interface 31, is located on the side of the fuel tank 4, and extends rearward along a first direction X; the second connecting segment 322 bends to the right from the first connecting segment 321, enters the gap between the fuel tank 4 and the carbon canister 5, and extends laterally along a second direction Y; the third connecting segment 321... Segment 323 bends to the left from the second connecting segment 322, goes around to the outside of the carbon canister 5, continues to extend rearward along the first direction X and connects to the electric drive assembly 2; wherein, the first fixing bracket 331 is fixed to the side wall of the fuel tank 4 to support and fix the first connecting segment 321, so that it maintains a set distance from the surface of the fuel tank 4; the second fixing bracket 332 and the third fixing bracket 333 are respectively provided on the left and right sides of the integrated bracket 7 in the second direction Y, to support and fix the second connecting segment 322, limit the second connecting segment 322, and prevent it from swinging or rubbing during vehicle vibration or steering.

[0070] In the above scheme, by rationally planning the routing path of the high-voltage wiring harness 32, it extends backward along the side of the fuel tank 4 after being led out from the battery pack 3, then laterally crosses the gap between the fuel tank 4 and the carbon canister 5, and then goes around to the outside of the carbon canister 5 to connect to the electric drive assembly 2. This path avoids the top area of ​​the fuel tank 4 (because the top is in contact with the front floor of the vehicle body, there is no space for wiring) and the bottom area (because the ground clearance is small, it is easily scratched by road protrusions). It makes use of the narrow space in the lower body structure, and the layout is more compact and reasonable. It can achieve a safe and feasible electrical connection under the limited overall vehicle layout conditions. On this basis, by setting the first fixed bracket 331, the second fixed bracket 332 and the third fixed bracket 333 to fix key sections, the shaking and displacement of the high-voltage wiring harness 32 during vehicle operation are effectively suppressed, so that the high-voltage wiring harness 32 remains in a non-contact state with the fuel tank 4 throughout the entire process. This effectively avoids the risk of insulation wear or heat conduction caused by long-term vibration and friction, and improves electrical safety and long-term reliability.

[0071] In other embodiments, such as Figure 4As shown, the integrated bracket 7 is a "U"-shaped bracket, with two mounting feet on the side near the floor 6, namely a first connecting part 71 and a second connecting part 72; wherein, the first connecting part 71 extends along the first direction X and is fixed to the lower surface of the second crossbeam 61 along the third direction Z by bolts or welding; the second connecting part 72 extends along the third direction Z and is connected to the front surface of the second crossbeam 61 along the first direction X by bolts or welding; thereby forming a bidirectional constraint in the first direction X and the third direction Z, making the integrated bracket 7 stable. The integrated bracket 7 is anchored to the second crossbeam 61. The side of the integrated bracket 7 away from the floor 6 is its functional end face. The carbon canister bracket 51, the second fixed bracket 332 and the third fixed bracket 333 are all located on this end face. The carbon canister bracket 51 is located on the side closer to the carbon canister 5 in the first direction X and is used to support the carbon canister body. The second fixed bracket 332 and the third fixed bracket 333 are located on the side closer to the oil tank 4 in the first direction X and are used to clamp the second connecting section 322 of the high voltage wire harness 32 that passes through the gap between the oil tank 4 and the carbon canister 5.

[0072] In the above solution, by adopting the integrated bracket 7 with a "U"-shaped structure, and providing a first connecting part 71 extending along the first direction X and a second connecting part 72 extending along the third direction Z at its bottom, the first connecting part 71 is fixed to the second crossbeam 61 along the third direction Z, and the second connecting part 72 is fixed to the second crossbeam 61 along the first direction X. This achieves a rigid connection between the integrated bracket 7 and the second crossbeam 61 in two orthogonal directions, significantly improving the torsional and vibration resistance of the overall installation structure. At the same time, the integrated bracket 7 integrates the installation function of the carbon canister 5 and the fixing function of the high-voltage wire harness 32 on the same structure, achieving highly integrated assembly while effectively avoiding spatial interference that may occur due to the arrangement of multiple independent brackets.

[0073] In other embodiments, such as Figure 1 , Figure 2 , Figure 3As shown, the fuel tank 4 is connected to a refueling pipe 41 on the side near the carbon canister 5, which is used to introduce fuel from the vehicle body refueling port into the fuel tank 4. The refueling pipe 41 is located at one end of this side in the second direction Y, near the third connecting section 323, so that the refueling pipe 41 and the high-voltage wiring harness 32 are adjacent to each other in the second direction Y but do not overlap. The bottom of the fuel tank 4 is provided with at least one fuel tank fixing bracket 42 with an upward opening. Specifically, in this embodiment, there are two fuel tank fixing brackets 42, which are U-shaped and located on both sides of the bottom of the fuel tank 4 along the second direction Y, with the openings facing upward and surrounding the outer contour of the bottom of the fuel tank 4. Their tops are fixedly connected to the floor 6 by bolts or rivets or other connectors in the third direction Z, thereby stably supporting the fuel tank 4 and confining it on the floor 6.

[0074] In the above scheme, by arranging the refueling pipe 41 on the side of the fuel tank 4 close to the carbon canister 5 and at one end of that side in the second direction Y near the third connecting section 323, the space of the outer area of ​​the carbon canister 5 in the second direction Y can be fully utilized, and the arrangement is more compact and reasonable. In addition, by using the fuel tank fixing bracket 42 with the opening facing upward to support the fuel tank 4 from below, a strong supporting rigidity can be provided to the fuel tank 4 in the third direction Z, thereby fixing the fuel tank 4. Moreover, this fixing method does not require drilling or welding on the fuel tank 4 shell, reducing the risk of leakage and facilitating the overall disassembly and maintenance of the fuel tank 4.

[0075] In other embodiments, the carbon canister 5 is connected to a first fuel pipe 52, a second fuel pipe 53, and a vent pipe 54 at one end in the second direction Y near the third connecting section 323. The first fuel pipe 52 guides the incompletely combusted fuel gas in the fuel tank 4 to the carbon canister 5 for adsorption. The second fuel pipe 53 is used to transport the desorbed fuel gas from the carbon canister 5 to the engine for re-combustion. The vent pipe 54 connects to the outside atmosphere to provide fresh air to the carbon canister 5. The first fuel pipe 52, the second fuel pipe 53, and the vent pipe 54 are arranged as a whole in the third direction Z above the third connecting section 323 and the refueling pipe 41, forming a clear upper and lower layered structure to avoid contact or interference with the high-voltage wiring harness 32 and the refueling pipe 41 below.

[0076] In the above scheme, by uniformly arranging the first fuel pipe 52, the second fuel pipe 53 and the vent pipe 54 above the third connecting section 323 and the refueling pipe 41, a clear upper and lower layered structure is formed, avoiding contact or interference with the high-voltage wiring harness 32 and the refueling pipe 41 below, thus optimizing the pipeline management of the whole vehicle and improving the compactness of the layout and the reliability of the system in the lower vehicle area.

[0077] In other embodiments, at least one fuel pipe bracket 43 is provided on the outer edge of the fuel tank 4 to fix the first fuel pipe 52 and the second fuel pipe 53, so that the first fuel pipe 52 and the second fuel pipe 53 are firmly constrained on the side of the fuel tank 4, and avoid swinging or colliding with each other due to vibration during vehicle operation.

[0078] In the above solution, by setting at least one fuel pipe bracket 43 for fixing the first fuel pipe 52 and the second fuel pipe 53 on the outer edge of the fuel tank 4, the first fuel pipe 52 and the second fuel pipe 53 are firmly constrained on the side of the fuel tank 4, making the wiring more stable and reliable. At the same time, the structural rigidity of the fuel tank 4 body is fully utilized as the pipeline support base, without the need to add an additional independent bracket or occupy the mounting point under the floor 6, simplifying the assembly process and improving the integration of components in the lower vehicle body area.

[0079] On the other hand, embodiments of this application provide a vehicle including the aforementioned lower body structure.

[0080] The vehicle proposed in this application adopts a rearward-folding arrangement for the electric drive assembly 2, causing its overall front-end profile to contract rearward in the first direction X. This allows the position of the first crossbeam 11 to be moved rearward accordingly in the first direction X, effectively freeing up the arrangement space of the fuel tank 4 behind it in the first direction X. At the same time, by changing the traditional side-mounted position of the carbon canister 5 in the Y direction to be arranged within the gap between the fuel tank 4 and the first crossbeam 11 in the first direction X, the arrangement space of the fuel tank 4 in the second direction Y is avoided. Thus, the problem of the arrangement space of the fuel tank 4 being restricted by the first crossbeam 11 in the first direction X and encroached upon by the carbon canister 5 in the second direction Y is significantly alleviated. Under the premise of maintaining a large battery pack configuration, the volume of the fuel tank 4 can be expanded, thereby improving the overall range of the vehicle.

[0081] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0083] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0084] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A subframe structure, characterized in that, include: The rear subframe (1) includes the first crossbeam (11); An electric drive assembly (2) is mounted on the rear subframe (1) and is located behind the first crossbeam (11) in the first direction (X); the electric drive assembly (2) includes a motor (21) and a reducer (22), and the motor (21) is located behind the reducer (22) in the first direction (X); The battery pack (3) is located in front of the first crossbeam (11) in the first direction (X); The fuel tank (4) is located behind the battery pack (3) in the first direction (X); The carbon canister (5) is located between the oil tank (4) and the first crossbeam (11) in the first direction (X) and is in communication with the oil tank (4); Wherein, the first direction (X) refers to the forward and backward direction of the vehicle.

2. The undercarriage structure according to claim 1, characterized in that, The battery pack (3) has a high-voltage wiring harness interface (31) on the side near the fuel tank (4), and the high-voltage wiring harness interface (31) is located on the outside of the fuel tank (4) in the second direction (Y); a high-voltage wiring harness (32) is connected to the high-voltage wiring harness interface (31), and the high-voltage wiring harness (32) is arranged along the side edge of the fuel tank (4) and connected to the electric drive assembly (2); the second direction (Y) refers to the left and right direction of the vehicle.

3. The undercarriage structure according to claim 2, characterized in that, It also includes a floor (6), which has a second crossbeam (61) above the carbon canister (5) along a third direction (Z), and the carbon canister (5) is mounted on the second crossbeam (61); the third direction (Z) refers to the vertical direction of the vehicle.

4. The undercarriage structure according to claim 3, characterized in that, An integrated bracket (7) extending along the second direction (Y) is provided between the oil tank (4) and the carbon canister (5); the integrated bracket (7) is fixed on the second crossbeam (61), and the integrated bracket (7) is provided with a carbon canister bracket (51) for fixing the carbon canister (5).

5. The underbody structure according to claim 4, characterized in that, It also includes a high-voltage wiring harness fixing assembly (33), which includes a first fixing bracket (331), a second fixing bracket (332), and a third fixing bracket (333); the high-voltage wiring harness (32) includes a first connecting segment (321), a second connecting segment (322), and a third connecting segment (323) connected in sequence; the first connecting segment (321) extends from the high-voltage wiring harness interface (31) and is located on the side of the oil tank (4); the second connecting segment (322) bends from the first connecting segment (321) and is located on the side of the oil tank (4). Between the tank (4) and the carbon canister (5), and extending along the second direction (Y); the third connecting section (323) bends from the second connecting section (322), is located on the side of the carbon canister (5), and is connected to the electric drive assembly (2); the first fixed bracket (331) is provided on the oil tank (4) for fixing the first connecting section (321); the second fixed bracket (332) and the third fixed bracket (333) are respectively provided on the left and right sides of the integrated bracket (7) in the second direction (Y) for fixing the second connecting section (322).

6. The undercarriage structure according to claim 5, characterized in that, The integrated bracket (7) is a "U"-shaped bracket, with a first connecting part (71) and a second connecting part (72) on the side near the floor (6); the first connecting part (71) extends along the first direction (X) and is connected to the second crossbeam (61) along the third direction (Z); the second connecting part (72) extends along the third direction (Z) and is connected to the second crossbeam (61) along the first direction (X); the carbon canister bracket (51), the second fixed bracket (332), and the third fixed bracket (333) are located on the side of the integrated bracket (7) away from the floor (6), and the carbon canister bracket (51) is located on the side near the carbon canister (5) in the first direction (X), and the second fixed bracket (332) and the third fixed bracket (333) are located on the side near the oil tank (4) in the first direction (X).

7. The underbody structure according to claim 5, characterized in that, The fuel tank (4) is connected to a refueling pipe (41) on the side near the carbon canister (5), and the refueling pipe (41) is located at one end of the side in the second direction (Y) near the third connecting section (323); the bottom of the fuel tank (4) is provided with at least one fuel tank fixing bracket (42) with an upward opening, and the top of the fuel tank fixing bracket (42) is connected to the floor (6) through a connector in the third direction (Z) to fix the fuel tank (4) to the floor (6).

8. The undercarriage structure according to claim 7, characterized in that, The carbon canister (5) is connected to a first fuel pipe (52), a second fuel pipe (53), and a vent pipe (54) at one end near the third connecting section (323) in the second direction (Y), and the first fuel pipe (52), the second fuel pipe (53), and the vent pipe (54) are located above the third connecting section (323) and the refueling pipe (41) in the third direction (Z).

9. The undercarriage structure according to claim 8, characterized in that, At least one fuel pipe bracket (43) is provided on the outer edge of the fuel tank (4) for fixing the first fuel pipe (52) and the second fuel pipe (53).

10. A vehicle, characterized in that, Including the underbody structure as described in any one of claims 1-9.

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