Vehicle body chassis structure and vehicle

Abstract

A vehicle body chassis structure and a vehicle. The vehicle body chassis structure comprises a front subframe located in the front of a vehicle, a rear subframe located at the rear of the vehicle, and connecting beams respectively arranged on a left side and a right side, wherein the front subframe is arranged below a front engine compartment in the front of the vehicle, the rear subframe is arranged below a rear floor at the rear of the vehicle, and the connecting beams on the two sides are connected between the front subframe and the rear subframe; and the front subframe, the rear subframe and the connecting beams on the two sides enclose a mounting space, the mounting space being at least divided into a fuel tank mounting space located behind the front subframe and a battery pack mounting space located behind the fuel tank mounting space. In the vehicle body chassis structure, by means of providing the connecting beams connecting the front subframe and the rear subframe, and forming the fuel tank mounting space and the battery pack mounting space between the front and rear subframes and the connecting beams, the collision impact on a fuel tank and a battery pack can be reduced, thereby improving the collision safety of the fuel tank and the battery pack.

Description

Body chassis structure and vehicle

[0001] This disclosure claims priority to patent application number 202311786532.8 filed with the China Patent Office on December 22, 2023, entitled “Body Chassis Structure and Vehicle,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of vehicle technology, and more particularly to a vehicle chassis structure. The present disclosure also relates to a vehicle equipped with the vehicle chassis structure. Background Art

[0003] With the development of technology and people's concern about vehicle endurance, hybrid vehicles are becoming more and more popular among consumers because they can have the acceleration and intelligence of electric vehicles while also having an endurance comparable to that of fuel vehicles.

[0004] Currently, hybrid vehicles, such as PHEVs (Plug-in Hybrid Electric Vehicles), typically have the fuel tank located in the rear floor, while the battery pack is typically located under the front floor. However, this current placement can easily cause the front subframe to shift rearward in a head-on collision, damaging the battery pack. A rear-end collision can also cause the rear subframe to shift forward, impacting the fuel tank. If the collision is severe, this can even cause a dangerous fuel tank leak.

[0005] Therefore, the existing arrangement of the fuel tank and the battery pack is obviously not conducive to improving the collision safety of the fuel tank and the battery pack, and needs to be improved. Summary of the Invention

[0006] In view of this, the present disclosure aims to propose a vehicle chassis structure to improve the collision safety of the fuel tank and battery pack.

[0007] To achieve the above objectives, the technical solution of the present disclosure is implemented as follows:

[0008] A vehicle chassis structure includes a front subframe located at the front of the vehicle, a rear subframe located at the rear of the vehicle, and connecting beams arranged on the left and right sides;

[0009] The front subframe is arranged below the front engine room at the front of the vehicle, the rear subframe is arranged below the rear floor at the rear of the vehicle, and the connecting beams on both sides are connected between the front subframe and the rear subframe;

[0010] The front subframe, the rear subframe, and the connecting beams on both sides form an installation space, and the installation space is at least divided into a fuel tank installation space located behind the front subframe and a battery pack installation space located behind the fuel tank installation space.

[0011] Furthermore, the connecting beams on each side include a front beam body whose front end is connected to the front sub-frame, and a rear beam body connected between the rear end of the front beam body and the rear sub-frame;

[0012] A front cross beam is connected between the rear ends of the front beam bodies on both sides, and the front cross beam separates the oil tank installation space and the battery pack installation space in the installation space.

[0013] Furthermore, the rear portion of the front subframe has a rear cross beam, and the front ends of the front beam bodies on both sides are respectively connected to the left and right ends of the rear cross beam;

[0014] The rear cross beam, the front cross beam, and the front beam bodies on both sides form the oil tank installation space.

[0015] Furthermore, the distance between the front beams on both sides is gradually reduced from front to rear along the front-rear direction of the vehicle;

[0016] When viewed from the upper and lower directions of the vehicle, the fuel tank installation space formed by the enclosure is similar to a trapezoid with a gradually decreasing width from front to rear, or is exactly a trapezoid with a gradually decreasing width from front to rear;

[0017] The above-mentioned width specifically refers to the width of the trapezoid in the left-right direction of the vehicle.

[0018] Furthermore, the length k of the rear cross beam in the left-right direction of the vehicle accounts for more than 50% of the width of the vehicle.

[0019] Furthermore, connection points s for connecting with the upper vehicle body are respectively provided at both ends of the rear cross beam, the rear ends of the front beam bodies on both sides, and the rear ends of the rear beam bodies on both sides.

[0020] Furthermore, the rear cross beam is a part of the front sub-frame and is a rear cross beam of the front sub-frame located at the rear end of the front sub-frame; or

[0021] The rear cross beam is a beam structure connected between the front ends of the connecting beams on both sides and is independently provided with the front sub-frame. While the rear cross beam is integrated with the connecting beams on both sides to form an integral frame structure, it is also connected to the front sub-frame to achieve the connection between the connecting beams on both sides and the front sub-frame.

[0022] Furthermore, the front subframe has front subframe longitudinal beams provided on the left and right sides, and the rear ends of the front subframe longitudinal beams on both sides are connected to the rear cross beam;

[0023] A front subframe middle crossbeam is connected between the front subframe longitudinal beams on both sides, the front ends of the front subframe longitudinal beams on both sides are connected to the front subframe front crossbeam, and the front end of the front subframe is provided with a front subframe anti-collision beam connected to the front subframe front crossbeam.

[0024] Furthermore, both ends of the rear cross beam have a connecting section bent backward, the front end of the front beam body on each side is connected to the corresponding connecting section, and transverse reinforcing ribs are provided at the bending positions at both ends of the rear cross beam; and / or,

[0025] The front subframe longitudinal beams on both sides include a longitudinal beam front section and a longitudinal beam rear section that are plugged and connected, and the cross section of the longitudinal beam front section is gradually reduced from front to rear, and the cross section of the front part of the longitudinal beam rear section is gradually increased from front to rear.

[0026] Furthermore, the rear subframe has rear subframe longitudinal beams provided on the left and right sides, the rear end of the rear beam on each side is connected to the front end of the rear subframe longitudinal beam on the same side, and the front end of the rear subframe is provided with a rear crossbeam connected between the rear beams on both sides;

[0027] The rear cross beam, the front cross beam, and the rear beam bodies on both sides form the battery pack installation space.

[0028] Furthermore, the rear cross member is connected to the position where the rear beam body and the rear subframe longitudinal beam are connected on each side; and / or,

[0029] A rear subframe front crossbeam and a rear subframe rear crossbeam are connected between the rear subframe longitudinal beams on both sides. The rear subframe front crossbeam is arranged close to the front ends of the rear subframe longitudinal beams on both sides, and the rear subframe rear crossbeam is arranged close to the rear ends of the rear subframe longitudinal beams on both sides.

[0030] Furthermore, the rear end of the rear subframe is provided with a rear subframe anti-collision beam connected to the rear subframe longitudinal beams on both sides;

[0031] The rear ends of the rear sub-frame longitudinal beams on both sides are connected with rear sub-frame energy absorption boxes, and the rear sub-frame anti-collision beams are connected with the rear sub-frame energy absorption boxes on both sides.

[0032] Furthermore, it also includes an exhaust system;

[0033] The exhaust pipe in the exhaust system enters the lower side of one side of the connecting beam through the fuel tank installation space, and the exhaust pipe extends along the connecting beam to the bottom of the rear subframe and is connected to the muffler located at the rear of the vehicle.

[0034] Furthermore, the muffler is located between the rear subframe and the rear subframe anti-collision beam.

[0035] Compared with the prior art, the present disclosure has the following advantages:

[0036] The vehicle body chassis structure disclosed in the present invention, by providing a connecting beam connecting the front and rear subframes, and forming a fuel tank installation space and a battery pack installation space between the front and rear subframes and the connecting beam, can not only utilize the frame structure formed by the front subframe, the connecting beam and the rear subframe to transmit and absorb the collision force and reduce the collision impact on the fuel tank and the battery pack when the vehicle collides, but also enable the fuel tank and the battery pack to slide along the formed frame structure, further reducing the collision impact on the fuel tank and the battery pack, thereby improving the collision safety of the fuel tank and the battery pack.

[0037] In addition, the connecting beam includes a connected front beam body and a rear beam body, and a front cross beam is arranged between the front beam bodies on both sides. On the one hand, it can adapt to the layout requirements of the fuel tank and is conducive to the formation of the fuel tank layout space. On the other hand, a three-way structure can also be formed between the connecting beam and the front cross beam. The three paths all serve as force transmission beams, which not only increase the support for the installation position of the fuel tank and prevent its deformation, but also facilitate the transmission and dispersion of collision force.

[0038] The rear portion of the front subframe features a rear crossbeam, which, along with the rear crossbeam, front crossbeam, and two front beams, encloses a fuel tank installation space. This creates a compact, ring-shaped frame structure at the fuel tank installation location, further enhancing fuel tank safety. By gradually decreasing the distance between the two front beams from front to rear, the resulting fuel tank installation space forms a trapezoidal or similar shape. This not only leverages the strength of the trapezoidal structure to further enhance collision safety at the fuel tank installation location, but also utilizes the gradually decreasing width of the trapezoid from front to rear, allowing the beam structures enclosing the fuel tank installation space to work together with other structures in the front subframe to provide support and protection against intrusion from front obstacles, thereby enhancing fuel tank safety.

[0039] Secondly, the arrangement of the front subframe middle crossbeam and the front subframe front crossbeam in the front subframe can cooperate with the formed fuel tank installation space to form multiple ring structures at the front of the vehicle body, which can increase the overall rigidity of the front of the vehicle body, which is beneficial to improving the safety of the fuel tank and the NVH performance of the vehicle. At the same time, the arrangement of the front subframe anti-collision beam can also increase the front subframe's ability to absorb collision energy.

[0040] The rear crossbeam is provided with rearward-bending connecting sections at both ends to facilitate connection between the rear crossbeam and the connecting beams on both sides. Transverse reinforcement ribs are provided at the bends at both ends of the rear crossbeam to increase the structural strength of the rear crossbeam ends, preventing the rear crossbeam from bending and deforming due to excessive single-point force during head-on collisions, especially small overlap collisions, which could affect the safety of the fuel tank. The front subframe longitudinal beam comprises a front and rear longitudinal beam sections that are connected and connected, with the cross-section of the front longitudinal beam section gradually decreasing from front to rear and the cross-section of the front of the rear longitudinal beam section gradually increasing from front to rear. This guides the front subframe longitudinal beam to bend and deform at the connection point during a collision, allowing the front section of the front subframe to absorb collision energy and protect the rear fuel tank.

[0041] Furthermore, a rear crossbeam connected between the two rear beams at the front end of the rear subframe facilitates the formation of a battery pack installation space. The annular frame structure formed by the front and rear crossbeams and the two rear beams can also be utilized to increase the collision safety of the battery pack. The rear crossbeam is connected to the location where the rear subframe longitudinal beams connect to the rear beams. The rear crossbeam can be used to increase the rigidity of the rear crossbeam, thereby helping to increase the safety of the battery pack. By arranging the front and rear crossbeams in the rear subframe, multiple annular structures can be formed at the rear of the vehicle body to accommodate the formed battery pack installation space. This can increase the overall rigidity of the rear of the vehicle body, which is beneficial for improving the safety of the battery pack and the NVH performance of the vehicle.

[0042] In addition, a rear subframe anti-collision beam is provided at the rear end of the rear subframe to improve the rear subframe's force transmission performance in rear collisions, so that the collision force is better transmitted forward along the rear subframe longitudinal beam, avoiding force at a single position, making it difficult to disperse the collision force and causing excessive deformation. At the same time, the rear subframe anti-collision beam can also serve as a pedestrian anti-involvement beam at the rear of the vehicle, which can improve safety during reversing.

[0043] The rear subframe's rear anti-collision beam is connected to the rear subframe longitudinal beam via a rear subframe energy absorption box, which allows for crush energy absorption, helping to further improve safety in rear-end collisions. The exhaust pipe in the exhaust system is arranged along the lower side of one of the connecting beams, facilitating its placement and reducing the impact of exhaust system heat on the fuel tank and battery pack. The muffler is located between the rear subframe and the rear subframe anti-collision beam, allowing the rear subframe anti-collision beam to better protect the muffler, preventing damage to the exhaust system from low-speed rear-end collisions.

[0044] Another object of the present disclosure is to provide a vehicle provided with the vehicle body chassis structure as described above.

[0045] The vehicle disclosed in the present invention has the same beneficial effects as the above-mentioned vehicle body chassis structure, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which constitute part of this disclosure, are used to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are used to explain the disclosure and do not constitute an improper limitation of the disclosure. In the accompanying drawings:

[0047] FIG1 is a schematic diagram of a vehicle chassis structure according to an embodiment of the present disclosure;

[0048] FIG2 is a schematic diagram of the structure shown in FIG1 without the fuel tank and the battery pack;

[0049] FIG3 is a schematic diagram of the structure shown in FIG2 without an exhaust system;

[0050] FIG4 is a schematic diagram of the structure of the fuel tank installation space and the battery pack installation space according to an embodiment of the present disclosure;

[0051] FIG5 is a schematic structural diagram of the front subframe according to an embodiment of the present disclosure;

[0052] FIG6 is a schematic diagram of a portion of the structure in FIG5 ;

[0053] FIG7 is a schematic structural diagram of the rear subframe according to an embodiment of the present disclosure;

[0054] FIG8 is a schematic diagram of collision force transmission of a vehicle body chassis structure according to an embodiment of the present disclosure;

[0055] Description of reference numerals:

[0056] 1. Front subframe; 2. Connecting beam; 3. Front crossbeam; 4. Rear crossbeam; 5. Rear subframe;

[0057] 101, front subframe longitudinal beam; 1011, front section of longitudinal beam; 1012, rear section of longitudinal beam; 1012a, front part of rear section of longitudinal beam; 102, front subframe front crossbeam; 103, front subframe middle crossbeam; 104, rear crossbeam; 104a, connecting section; 104b, transverse reinforcement; 105, front subframe anti-collision beam; 106, front subframe energy absorption box; 201, front beam body; 202, rear beam body; 501, rear subframe longitudinal beam; 502, rear subframe front crossbeam; 503, rear subframe rear crossbeam; 504, rear subframe anti-collision beam; 505, rear subframe energy absorption box;

[0058] 100, fuel tank; 200, battery pack; 300, exhaust system; 301, exhaust pipe; 302, muffler;

[0059] M, fuel tank installation space; N, battery pack installation space; k, length of the rear crossbeam; s, connection point with the upper body. DETAILED DESCRIPTION

[0060] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0061] In the description of this disclosure, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this disclosure and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0062] Furthermore, in the description of this disclosure, unless otherwise explicitly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, these terms can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in this disclosure based on the specific circumstances.

[0063] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Example 1

[0064] This embodiment relates to a vehicle chassis structure, which is applied to a hybrid vehicle having a fuel tank 100 and a battery pack 200, and can be, for example, a PHEV vehicle. The vehicle chassis structure is conducive to achieving lightweight vehicle body and helps to improve the collision safety of the fuel tank and battery pack.

[0065] At present, traditional body structures mainly include load-bearing bodies and non-load-bearing bodies. The differences between the two lie in structure, weight and ride comfort.

[0066] A non-load-bearing vehicle body generally consists of a frame and a body. The frame houses the engine, transmission, suspension, and other components, while the body merely provides a closed environment for driving and does not carry loads. Furthermore, a non-load-bearing vehicle body is heavy, has a high center of gravity, and offers relatively poor handling and low comfort on paved roads. However, because the frame provides excellent rigidity, the chassis is strong and has good anti-bumping performance, resulting in excellent stability and safety, and is also easy to modify.

[0067] A monocoque vehicle lacks a rigid frame; all vehicle components are mounted directly on the body, acting as a load-bearing structure, subjecting it to various loads. Monocoque vehicles are also lightweight, have a low center of gravity, offer excellent maneuverability, are easy to assemble, and offer greater comfort on paved roads. However, monocoque vehicles have weak torsional rigidity and load-bearing capacity. Furthermore, due to the lack of a rigid frame, reinforcements are typically limited to the front, sides, rear, and floor, resulting in relatively poor overall safety.

[0068] Based on the above introduction, for new energy vehicles, especially hybrid vehicles, in order to fully utilize the advantages of the load-bearing body and improve the shortcomings of the load-bearing body, this embodiment creatively proposes a body chassis structure developed based on the load-bearing body. At this time, in terms of the overall structure, combined with what is shown in Figures 1 to 3, the body chassis structure of this embodiment includes a front subframe 1 located at the front of the vehicle, a rear subframe 5 located at the rear of the vehicle, and connecting beams 2 arranged on the left and right sides.

[0069] The front subframe 1 is located beneath the front engine compartment at the front of the vehicle, and the rear subframe 5 is located beneath the rear floor at the rear of the vehicle. Connecting beams 2 are connected between the front and rear subframes 1 and 5. The front and rear subframes 1, 5, and connecting beams 2 define an installation space. This space also defines a fuel tank installation space M located behind the front subframe 1 and a battery pack installation space N located behind the fuel tank installation space M.

[0070] At this time, as set up above, by adopting a load-bearing body structure with front and rear subframes, this embodiment can take advantage of the smaller weight of the load-bearing body to achieve lightweight body, thereby improving the endurance of the entire vehicle.

[0071] At the same time, by providing a connecting beam 2 connecting the front and rear subframes, and forming a fuel tank installation space M and a battery pack installation space N between the front and rear subframes and the connecting beam 2, when the vehicle collides, this embodiment can not only use the frame structure formed by the front subframe 1, the connecting beam 2 and the rear subframe 5 to transmit and absorb the collision force, thereby reducing the collision impact on the fuel tank 100 and the battery pack 200, but it can also make the fuel tank 100 and the battery pack 200 slide along the formed frame structure, further reducing the collision impact on the fuel tank 100 and the battery pack 200, thereby achieving the effect of improving the collision safety of the fuel tank 100 and the battery pack 200.

[0072] In detail, first of all, it should be pointed out that in the installation space enclosed by the front and rear subframes and the connecting beams 2 on both sides, in addition to separating the fuel tank installation space M and the battery pack installation space N, of course, according to needs, it is also possible to further separate the installation space for the arrangement of other components.

[0073] In addition, still taking the separation of the fuel tank installation space M and the battery pack installation space N as an example, this embodiment is a preferred implementation form. Each side connecting beam 2 includes a front beam body 201 whose front end is connected to the front sub-frame 1, and a rear beam body 202 connected between the rear end of the front beam body 201 and the rear sub-frame 5, and a front cross beam 3 is also connected between the rear ends of the front beam bodies 201 on both sides, and the front cross beam 3 separates the fuel tank installation space M and the battery pack installation space N in the above-mentioned installation space.

[0074] At this point, it is understood that each side connecting beam 2 includes a connected front beam body 201 and a rear beam body 202, and the front cross beam 3 is connected between the rear ends of the two front beam bodies 201. On the one hand, this can adapt to the layout requirements of the fuel tank 100 and facilitate the formation of the fuel tank layout space M. On the other hand, it can also form a three-way structure between each side connecting beam 2 and the front cross beam 3, and the three paths in the three-way structure all serve as force transmission beams. This not only increases support for the fuel tank installation position M and prevents its deformation, but also facilitates the transmission and dispersion of collision forces.

[0075] In this embodiment, for the above-mentioned fuel tank installation space M, as an exemplary implementation form, the rear portion of the front subframe 1 has a rear cross beam 104, and the front ends of the front beam bodies 201 on both sides are respectively connected to the left and right ends of the rear cross beam 104, and the above-mentioned fuel tank installation space M is specifically formed by the rear cross beam 104, the front cross beam 3, and the front beam bodies 201 on both sides.

[0076] At this time, by providing the rear cross member 104 at the rear of the front subframe 1, and by forming the fuel tank installation space M by the rear cross member 104, the front cross member 3, and the front beam bodies 201 on both sides, it can be understood that, as shown in FIG. 2 , the installation position of the fuel tank 100 can form a compact annular frame structure, thereby better increasing the safety of the fuel tank 100.

[0077] In addition, it should be noted that, as a preferred embodiment, further referring to Figures 4 and 5 , the rear cross member 104 can serve as a portion of the front subframe 1, and specifically as a front subframe rear cross member located at the rear end of the front subframe 1. However, in addition to serving as the front subframe rear cross member, the rear cross member 104 of this embodiment can also be connected between the front ends of the connecting beams 2 on both sides, and be independent of the beam structure provided on the front subframe 1. In this case, while the rear cross member 104 is integrally connected to the connecting beams 2 on both sides to form an integral frame structure, it is also connected to the front subframe 1 to achieve the connection between the connecting beams 2 on both sides and the front subframe 1.

[0078] In this embodiment, it is worth noting that when the front cross member 104 is provided independently of the front sub-frame 1, the connection between the front cross member 104 and the front sub-frame 1 is generally also connected to the rear ends of the front sub-frame longitudinal members 101 on both sides. Furthermore, when the front cross member 104 is provided independently of the front sub-frame 1, the front sub-frame rear cross member in the front sub-frame 1 can be selectively provided as needed.

[0079] Still taking the aforementioned rear cross member 104 as the rear cross member of the front subframe as an example, in specific implementation, the front subframe 1 of this embodiment can be based on the structure of the front subframe in existing monocoque vehicles. Generally speaking, still referring to FIG5 , the front subframe 1 includes front subframe longitudinal beams 101 disposed on the left and right sides, with the rear ends of the front subframe longitudinal beams 101 on both sides connected to the front cross member 104, which serves as the rear cross member of the front subframe. In addition, a front subframe middle cross member 103 is connected between the front subframe longitudinal beams 101 on both sides, and the front ends of the front subframe longitudinal beams 101 on both sides are also connected to the front subframe front cross member 102. Furthermore, a front subframe anti-collision beam 105 connected to the front subframe front cross member 102 is provided at the front end of the front subframe 1.

[0080] It is understandable that, by disposing the front subframe middle cross member 103 and the front subframe front cross member 102 in the front subframe 1, this embodiment can obviously cooperate with the formed fuel tank installation space M to form multiple annular structures at the front of the vehicle body, thereby increasing the overall rigidity of the front of the vehicle body, which is beneficial to improving the safety of the fuel tank 100 and the NVH (Noise, Vibration, Harshness) performance of the vehicle.

[0081] Furthermore, it should be noted that, in specific implementation, it is preferred that, in this embodiment, two front subframe energy absorbing boxes 106, one on each left and one on the front side of the front subframe front cross member 102, be provided, and the front subframe anti-collision beam 105 is connected to the front subframe front cross member 102 via the two front subframe energy absorbing boxes 106. Thus, by providing the two front subframe energy absorbing boxes 106, the ability to absorb collision force can be increased during a vehicle collision, particularly a head-on collision, thereby reducing damage caused by the collision.

[0082] In this embodiment, as shown in FIG4 , as a preferred implementation form, the distance between the front beams 201 on both sides is also gradually reduced from front to rear in the vehicle's front-to-rear direction, and when viewed from the top and bottom of the vehicle, the fuel tank installation space M formed by the enclosed structure resembles a trapezoid with a gradually decreasing width from front to rear. The aforementioned width specifically refers to the width of the trapezoid in the left-right direction of the vehicle.

[0083] At this time, the fuel tank installation space M is formed to be similar to a trapezoid, and the high strength of the trapezoidal structure can be utilized to further increase the collision safety of the installation position of the fuel tank 100. At the same time, the width of the trapezoid can be gradually reduced from front to rear, so that the beam structures that enclose the fuel tank installation space M and other structures in the front subframe 1 can provide support and protection together to resist the intrusion of front obstacles, which is beneficial to increasing the safety of the fuel tank 100.

[0084] Of course, it should be noted that, in addition to forming the fuel tank installation space M similar to a trapezoid as described above, in specific implementations, it is also possible to form the fuel tank installation space M in an exact trapezoidal shape, with the width gradually decreasing from front to back. Furthermore, when the fuel tank installation space M is formed in an exact trapezoidal shape, it can also increase the safety of the fuel tank 100.

[0085] In this preferred embodiment, as shown in FIG5 , each end of the rear crossbeam 104 has a rearwardly bent connecting section 104a. The front end of each front beam body 201 is connected to the corresponding connecting section 104a. Transverse reinforcing ribs 104b are also provided at the bent locations on both ends of the rear crossbeam 104. The rearwardly bent connecting sections 104a at both ends of the rear crossbeam 104 facilitate connection between the rear crossbeam 104 and the connecting beams 2 on either side. The transverse reinforcing ribs 104b at the bent locations on both ends of the rear crossbeam 104 increase the structural strength of the rear crossbeam 104 at its ends, preventing the rear crossbeam 104 from bending and deforming due to excessive force at a single point during a head-on collision, particularly a small overlap collision, which could compromise the safety of the fuel tank 100.

[0086] In a specific implementation, based on the aforementioned rear cross member 104 and the beam bodies in the front subframe 1, which are generally hollow beam structures that are buckled together, when preparing the components constituting the rear cross member 104 (usually the upper half beam body and the lower half beam body), the transverse reinforcing ribs 104b can be integrally prepared on the components of the rear cross member 104 by stamping.

[0087] In this embodiment, combined with what is shown in FIG8 , as a preferred implementation form, based on the fact that the fuel tank installation space M formed by the rear cross beam 104 and the front cross beam 3 and the front beam bodies 201 on both sides is trapezoidal, the length k of the rear cross beam 104 in the left and right direction of the vehicle can be set to, for example, more than 50% of the width of the vehicle.

[0088] In this way, by making the length k of the rear cross beam 104 account for more than 50% of the width of the entire vehicle, the rear cross beam 104 can overlap with the collision barrier during a small overlap collision. This can ensure that the trapezoidal structure formed by the front subframe 1 and the installation position of the fuel tank 100 participates in the small overlap collision condition, which is beneficial to the transmission and decomposition of the small overlap collision force and can reduce collision intrusion damage.

[0089] In a specific implementation, the percentage of the length k of the rear cross beam 104 in the left-right direction of the vehicle to the width of the vehicle may be, for example, 50%, 52%, 53%, 54% or 55%.

[0090] In this embodiment, as shown in FIG5 and in conjunction with FIG6 , as a preferred embodiment, the front subframe longitudinal beams 101 on both sides of the front subframe 1 are specifically structured to include a front longitudinal beam section 1011 and a rear longitudinal beam section 1012 that are connected and plugged together. Furthermore, the cross-section of the front longitudinal beam section 1011 is gradually reduced from front to rear, while the cross-section of the front portion of the rear longitudinal beam section 1012, i.e., the front portion 1012a of the rear longitudinal beam section in FIG6 , is gradually increased from front to rear.

[0091] At this time, by making the front subframe longitudinal beam 101 include a longitudinal beam front section 1011 and a longitudinal beam rear section 1012 that are connected and connected, and by making the cross-section of the longitudinal beam front section 1011 gradually smaller from front to rear and the cross-section of the front portion of the longitudinal beam rear section 1012 gradually larger from front to rear, it can be understood that compared with a case where the cross-section is consistent front to back or the cross-section changes uniformly along a single direction, this embodiment can guide the front subframe longitudinal beam 101 to bend and deform at the connection position during a collision. In addition, the bending of the front subframe longitudinal beams 101 on both sides can be used to absorb the collision energy at the front of the front subframe 1, thereby achieving the effect of protecting the rear fuel tank 100.

[0092] In addition, in a specific implementation, for the plug-in setting between the front and rear sections of the longitudinal beam, for example, the front end of the rear section 1012 of the longitudinal beam can be inserted into the front section 1011 of the longitudinal beam, and after the two are plugged together, they are also fixed together by welding.

[0093] In this embodiment, as shown in FIG7 , the rear subframe 5 may structurally refer to the rear subframe structure of an existing load-bearing vehicle body. Specifically, the rear subframe 5 includes rear subframe longitudinal beams 501 disposed on the left and right sides, and the rear end of the rear beam 202 on each side is connected to the front end of the rear subframe longitudinal beam 501 on the same side. In addition, the front end of the rear subframe 5 is also provided with a rear crossbeam 4 connected between the rear beams 202 on both sides. The battery pack installation space N is formed by the rear crossbeam 4, the front crossbeam 3, and the rear beams 202 on both sides.

[0094] In this way, by setting a rear cross beam 4 connected between the rear beams 202 on both sides at the front end of the rear subframe 5, it is convenient to form a battery pack installation space N, and the annular frame structure formed by the front cross beam 3, the rear cross beam 4 and the rear beams 202 on both sides can also be used to increase the collision safety of the battery pack 200.

[0095] It should be noted that, in a specific implementation, as a preferred embodiment, the rear cross member 4 can be connected, for example, to the location where the rear beam 202 on each side connects to the rear subframe longitudinal beam 501. Thus, by connecting the rear cross member 4 to the location where the rear subframe longitudinal beam 501 connects to the rear beam 202, the rigidity of the rear cross member 4 can be increased by leveraging the rear subframe longitudinal beam 501, thereby helping to enhance the safety of the battery pack 200.

[0096] Furthermore, referring still to FIG7 , in this embodiment, a rear subframe front cross member 502 and a rear subframe rear cross member 503 are connected between the two rear subframe longitudinal beams 501. The rear subframe front cross member 502 is disposed near the front ends of the two rear subframe longitudinal beams 501, while the rear subframe rear cross member 503 is disposed near the rear ends of the two rear subframe longitudinal beams 501. Thus, the arrangement of the rear subframe front cross member 502 and the rear subframe rear cross member 503 in the rear subframe 5 can obviously also accommodate the formed battery pack installation space N, forming multiple annular structures at the rear of the vehicle body. This can increase the overall rigidity of the rear vehicle body, thereby facilitating improved safety of the battery pack 200 and also enhancing the NVH performance of the vehicle.

[0097] In this embodiment, as a preferred implementation form, still referring to FIG. 7 , a rear subframe anti-collision beam 504 connected to the rear subframe longitudinal beams 501 on both sides is also provided at the rear end of the rear subframe 5, and rear subframe energy absorbing boxes 505 are connected to the rear ends of the rear subframe longitudinal beams 501 on both sides. The above-mentioned rear subframe anti-collision beam 504 is connected to the rear subframe energy absorbing boxes 505 on both sides.

[0098] In this case, the aforementioned rear subframe anti-collision beam 504 and rear subframe energy absorption box 505 can both adopt conventional anti-collision beam and energy absorption box structures. Furthermore, it is understood that by providing the rear subframe anti-collision beam 504 at the rear end of the rear subframe 5, the rear subframe 5's force transmission performance can be improved, allowing the collision force to be better transmitted forward along the rear subframe longitudinal beam 501, thereby avoiding single-position force distribution and excessive deformation. Furthermore, the provided rear subframe anti-collision beam 504 can also serve as a pedestrian anti-entanglement beam at the rear of the vehicle, thereby improving safety during reversing.

[0099] The above configuration allows the rear subframe rear anti-collision beam 504 to be connected to the rear subframe longitudinal beam 501 via the rear subframe energy absorption box 505 , which can absorb energy through the rear subframe energy absorption box 505 , thereby further improving safety during rear-end collisions.

[0100] Still referring to Figures 1 and 2 , the vehicle chassis structure of this embodiment also includes an exhaust system 300, which is used to discharge exhaust gas generated by the engine within the front engine compartment. Specifically, an exhaust pipe 301 in this exhaust system 300 passes through the fuel tank installation space M and enters the lower side of one of the connecting beams 2. Exhaust pipe 301 extends along the connecting beam 2 to the bottom of the rear subframe 5, where it connects to a muffler 302 located at the rear of the vehicle.

[0101] In this way, the exhaust pipe 301 in the exhaust system 300 is arranged along the lower side of one side connecting beam 2. It can be understood that it can facilitate the arrangement of the exhaust pipe 301 and can also reduce the impact of the heat of the exhaust system 300 on the fuel tank 100 and the battery pack 200.

[0102] Furthermore, the muffler 302 in the exhaust system 300 is preferably located between the rear subframe 5 and the rear subframe anti-collision beam 504. Thus, the present embodiment can utilize the additional rear subframe anti-collision beam 504 to better protect the muffler 302, thereby preventing damage to the exhaust system 300 caused by a low-speed rear collision.

[0103] In this embodiment, as a preferred implementation, and further with reference to Figures 3 and 4 , connection points s for connection to the upper vehicle body are provided at each end of the rear cross member 104 and at the rear ends of the front beams 201 on either side. By providing connection points s for connection to the upper vehicle body at each end of the rear cross member 104 and at the rear ends of the front beams 201 on either side, the rigidity of the ends of the rear cross member 104 and at the rear ends of the front beams 201 can be increased by leveraging the upper vehicle body frame, thereby improving collision force absorption and transmission capabilities.

[0104] In addition to the connection points s provided above, this embodiment also provides connection points s for connection to the upper vehicle body at the rear ends of the rear beams 202 on both sides. By providing connection points s for connection to the upper vehicle body at the rear ends of the rear beams 202, it is apparent that the rigidity of the rear beams 202 can be increased by leveraging the upper vehicle body frame, thereby further improving the rear beams 202's ability to absorb and transmit collision forces.

[0105] In addition to the aforementioned connection points s, to meet the connection requirements with the upper body, this embodiment further provides connection points s at both ends of the front subframe front cross member 102, and on the rear cross member 104 near the connection points with the front subframe longitudinal members 101 on both sides. Furthermore, in a specific implementation, the aforementioned connection points s may, for example, employ fixed connecting sleeves, which can be connected to the upper body via connecting bolts passing through the connecting sleeves.

[0106] The vehicle body chassis structure of this embodiment is configured as described above. By providing a connecting beam 2 connecting the front and rear subframes, and forming a fuel tank installation space M and a battery pack installation space N between the front and rear subframes and the connecting beam 2, when the vehicle collides, this embodiment can not only utilize the frame structure formed by the front subframe 1, the connecting beam 2 and the rear subframe 5 to transmit and absorb the collision force, thereby reducing the collision impact on the fuel tank 100 and the battery pack 200, but it can also allow the fuel tank 100 and the battery pack 200 to slide along the formed frame structure, further reducing the collision impact on the fuel tank 100 and the battery pack 200, and thus improving the collision safety of the fuel tank 100 and the battery pack 200.

[0107] Furthermore, in the aforementioned vehicle chassis structure of this embodiment, since the front and rear ends of the chassis still comprise front and rear subframes, as can be seen in Figures 2 and 3 , the front and rear subframe structures have a smaller cross-section in the Y direction (i.e., the left-right direction of the vehicle) than the frame in a non-load-bearing body, and the subframe longitudinal beams at the front and rear subframe locations still utilize a curved longitudinal beam structure. This makes the chassis structure of this embodiment a structural innovation in the form of subframes, significantly different from conventional non-load-bearing frame beam structures. Specifically, the front and rear subframes of this embodiment remain separate units, simply adding a front-to-rear connecting beam 2 to the front and rear subframes of a load-bearing body, rather than the integrated beam structure of a non-load-bearing body.

[0108] Of course, precisely because of the integrated front and rear subframe structure connected by the connecting beam 2, this embodiment, as mentioned above, not only leverages the advantages of a monocoque structure to reduce vehicle weight and increase vehicle range, but also forms an annular protective frame to further enhance the collision safety of the fuel tank 100 and battery pack 200. This not only addresses the shortcomings of a monocoque structure but also possesses the advantages of a non-monocoque structure, significantly improving the overall quality of the vehicle and offering excellent practicality.

[0109] In addition, as still shown in FIG8 , when the vehicle body structure of this embodiment collides with the vehicle, for a head-on collision condition, the collision force is transmitted to the front subframe longitudinal beam 101 via the front subframe anti-collision beam 105. Then, a portion of the collision force can be transmitted to the connecting beam 2 and transmitted and dispersed rearward along the connecting beam 2, while the remaining collision force can be transmitted laterally (i.e., in the left-right direction of the entire vehicle) along the front subframe front cross beam 102, the front subframe middle cross beam 103, the rear cross beam 104, the front cross beam 3, and the rear cross beam 4, which are arranged in sequence.

[0110] In the case of a rear-end collision, the collision force is transmitted to the rear subframe longitudinal beam 501 via the rear subframe anti-collision beam 504. Then, part of the collision force can be transmitted to the connecting beam 2 and transmitted and dispersed forward along the connecting beam 2, while the remaining collision force can be transmitted laterally (i.e., in the left-right direction of the entire vehicle) along the rear subframe rear cross beam 503, the rear subframe front cross beam 502, the rear cross beam 4, the front cross beam 3 and the cross beams in the front subframe 1, etc., which are arranged in sequence.

[0111] Therefore, through the absorption of collision energy by the front and rear subframe anti-collision beams and the front and rear subframe energy absorption boxes in the vehicle body chassis structure, as well as the transmission and dispersion of collision force by the intermediate beams and the absorption of collision energy during the transmission process, this embodiment can effectively reduce the collision force transmitted to the fuel tank 100 and the battery pack 200, so as to achieve the effect of improving the safety of the fuel tank 100 and the battery pack 200. Example 2

[0112] This embodiment relates to a vehicle, which is a hybrid vehicle, and the vehicle is provided with the vehicle chassis structure of the first embodiment. Moreover, the vehicle of this embodiment is provided with the vehicle chassis structure of the first embodiment,

[0113] The vehicle of this embodiment is provided with the body chassis structure of the first embodiment. On the basis of a traditional load-bearing body, the front and rear subframes are connected via connecting beams 2 on both sides. This is not only conducive to achieving lightweight of the body and improving the endurance of the entire vehicle, but also can reduce the collision impact on the fuel tank 100 and the battery pack 200, increase the collision safety of the fuel tank 100 and the battery pack 200, and help to improve the safety quality of the entire vehicle.

[0114] Furthermore, it should be noted that, based on the body-chassis structure of Example 1, the vehicle of this embodiment is assembled in the same manner as conventional monocoque body-type vehicles, with the bottom subframe being assembled onto the upper body. The upper body frame serves as the main load-bearing component of the vehicle, and the chassis components are assembled into the vehicle body via the front and rear subframes. Furthermore, in the event of a collision, the upper body frame, along with the front and rear subframes and connecting beams 2 of the body-chassis structure, absorbs and transmits the impact force, rather than relying solely on the frame beams to transmit force and absorb energy as in a non-monocoque body-type vehicle.

[0115] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A vehicle chassis structure, characterized in that: It comprises a front subframe (1) located at the front of the vehicle, a rear subframe (5) located at the rear of the vehicle, and connecting beams (2) arranged on the left and right sides; The front subframe (1) is arranged below the front cabin at the front of the vehicle, the rear subframe (5) is arranged below the rear floor at the rear of the vehicle, and the connecting beams (2) on both sides are connected between the front subframe (1) and the rear subframe (5); The front sub-frame (1), the rear sub-frame (5), and the connecting beams (2) on both sides form an installation space, and the installation space is at least divided into a fuel tank installation space (M) located behind the front sub-frame (1), and a battery pack installation space (N) located behind the fuel tank installation space (M).

2. The vehicle chassis structure according to claim 1, characterized in that: The connecting beam (2) on each side comprises a front beam body (201) whose front end is connected to the front sub-frame (1), and a rear beam body (202) connected between the rear end of the front beam body (201) and the rear sub-frame (5); A front crossbeam (3) is connected between the rear ends of the front beam bodies (201) on both sides, and the front crossbeam (3) separates the oil tank installation space (M) and the battery pack installation space (N) in the installation space.

3. The vehicle chassis structure according to claim 2, characterized in that: The rear portion of the front subframe (1) is provided with a rear crossbeam (104), and the front ends of the front beam bodies (201) on both sides are respectively connected to the left and right ends of the rear crossbeam (104); The rear cross beam (104), the front cross beam (3), and the front beam bodies (201) on both sides enclose and form the oil tank installation space (M).

4. The vehicle chassis structure according to claim 3, characterized in that: From front to rear along the front-rear direction of the vehicle, the distance between the front beam bodies (201) on both sides is gradually reduced; From the vertical direction of the vehicle, the fuel tank installation space (M) formed by the enclosure is similar to a trapezoid with a gradually decreasing width from front to rear, or is exactly a trapezoid with a gradually decreasing width from front to rear; The above-mentioned width specifically refers to the width of the trapezoid in the left-right direction of the vehicle.

5. The vehicle chassis structure according to claim 4, characterized in that: The length k of the rear cross beam (104) in the left-right direction of the whole vehicle accounts for more than 50% of the width of the whole vehicle.

6. The vehicle chassis structure according to claim 3, characterized in that: Connection points s for connection with the upper vehicle body are respectively provided at the two ends of the rear cross beam (104), the rear ends of the front beam bodies (201) on both sides, and the rear ends of the rear beam bodies (202) on both sides.

7. The vehicle chassis structure according to claim 3, characterized in that: The rear cross beam (104) is a part of the front sub-frame (1) and is a rear cross beam of the front sub-frame located at the rear end of the front sub-frame (1); or, The rear cross beam (104) is a beam structure connected between the front ends of the connecting beams (2) on both sides and arranged independently of the front sub-frame (1); and while the rear cross beam (104) is integrated with the connecting beams (2) on both sides to form an integral frame structure, it is also connected to the front sub-frame (1) to achieve connection between the connecting beams (2) on both sides and the front sub-frame (1).

8. The vehicle chassis structure according to claim 7, characterized in that: The front sub-frame (1) comprises front sub-frame longitudinal beams (101) arranged on the left and right sides, and the rear ends of the front sub-frame longitudinal beams (101) on the two sides are connected to the rear cross beam (104); A front sub-frame middle cross beam (103) is connected between the front sub-frame longitudinal beams (101) on both sides, the front ends of the front sub-frame longitudinal beams (101) on both sides are connected to the front sub-frame front cross beam (102), and the front end of the front sub-frame (1) is provided with a front sub-frame anti-collision beam (105) connected to the front sub-frame front cross beam (102).

9. The vehicle chassis structure according to claim 8, characterized in that: Both ends of the rear cross beam (104) have connection sections (104a) bent backwards, the front ends of the front beam bodies (201) on each side are connected to the corresponding connection sections (104a), and transverse reinforcing ribs (104b) are provided at the bending positions at both ends of the rear cross beam (104); and / or, The front sub-frame longitudinal beams (101) on both sides include a longitudinal beam front section (1011) and a longitudinal beam rear section (1012) which are plugged and connected, and the cross section of the longitudinal beam front section (1011) is gradually reduced from front to rear, and the cross section of the front part of the longitudinal beam rear section (1012) is gradually increased from front to rear.

10. The vehicle chassis structure according to any one of claims 2 to 9, characterized in that: The rear sub-frame (5) has rear sub-frame longitudinal beams (501) arranged on the left and right sides, the rear end of the rear beam body (202) on each side is connected to the front end of the rear sub-frame longitudinal beam (501) on the same side, and the front end of the rear sub-frame (5) is provided with a rear cross beam (4) connected between the rear beam bodies (202) on both sides; The rear cross beam (4), the front cross beam (3), and the rear beam bodies (202) on both sides enclose and form the battery pack installation space (N).

11. The vehicle chassis structure according to claim 10, characterized in that: The rear cross beam (4) is connected to the position where the rear beam body (202) and the rear subframe longitudinal beam (501) are connected on each side; and / or, A rear subframe front crossbeam (502) and a rear subframe rear crossbeam (503) are connected between the rear subframe longitudinal beams (501) on both sides; the rear subframe front crossbeam (502) is arranged close to the front ends of the rear subframe longitudinal beams (501) on both sides, and the rear subframe rear crossbeam (503) is arranged close to the rear ends of the rear subframe longitudinal beams (501) on both sides.

12. The vehicle chassis structure according to claim 10, characterized in that: The rear end of the rear sub-frame (5) is provided with a rear sub-frame anti-collision beam (504) connected to the rear sub-frame longitudinal beams (501) on both sides; The rear ends of the rear sub-frame longitudinal beams (501) on both sides are connected to rear sub-frame energy absorption boxes (505), and the rear sub-frame anti-collision beams (504) are connected to the rear sub-frame energy absorption boxes (505) on both sides.

13. The vehicle chassis structure according to claim 12, characterized in that: Also included is an exhaust system (300); An exhaust pipe (301) in the exhaust system (300) enters the lower side of the connecting beam (2) on one side through the oil tank installation space (M), and the exhaust pipe (301) extends along the connecting beam (2) to the bottom of the rear subframe (5) and is then connected to a muffler (302) located at the rear of the vehicle.

14. The vehicle chassis structure according to claim 13, characterized in that: The muffler (302) is located between the rear subframe (5) and the rear subframe anti-collision beam (504).

15. A vehicle, characterized in that: The vehicle is provided with the vehicle body chassis structure according to any one of claims 1 to 14.

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