Vehicle chassis structure and vehicle

Abstract

The invention provides a vehicle chassis structure and a vehicle. The vehicle chassis structure comprises connecting beams arranged on the left side and the right side respectively and a battery pack located between the connecting beams on the two sides. The connecting beams on the two sides extend in the front-back direction of the whole vehicle and are arranged below threshold beams on the same side in the vehicle body. Connecting pieces are arranged on the left side and the right side of the battery pack respectively, and the battery pack is connected with the connecting beam and / or the doorsill beam through the connecting pieces. By arranging the connecting beams on the left side and the right side of the battery pack, the safety of the battery pack during side collision of a vehicle can be improved, and the safety quality of the vehicle can be improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle chassis structure. The present invention also relates to a vehicle provided with the vehicle chassis structure. Background Art

[0002] At present, for new energy vehicles, especially pure electric vehicles, the battery pack is generally arranged under the passenger compartment. In order to provide a longer driving range, while requiring the vehicle body weight to be as low as possible, it also requires a larger layout space in the vehicle body to adopt a larger battery pack to provide more electricity.

[0003] However, when the battery pack is larger in size, the side of the battery pack is smaller than the outside of the vehicle body. When the vehicle has a side collision, it is easy to impact the battery pack, causing damage to the battery pack. In severe cases, it may even cause the battery pack to catch fire, posing a great risk to the safety of the driver and passengers, and is not conducive to improving the safety quality of the entire vehicle. Summary of the invention

[0004] In view of this, the present invention aims to provide a vehicle chassis structure to increase the safety of the battery pack during a side collision of the vehicle.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A vehicle chassis structure, comprising connecting beams disposed on left and right sides, and a battery pack located between the connecting beams on both sides;

[0007] The connecting beams on both sides extend along the front-rear direction of the vehicle and are respectively arranged below the door sill beam on the same side of the vehicle body;

[0008] Connecting members are respectively provided on the left and right sides of the battery pack, and the battery pack is connected to the connecting beam and / or the door sill beam through the connecting members.

[0009] Furthermore, the left and right sides of the battery pack are respectively provided with connecting brackets, and the connecting brackets on each side are connected to the lower side of the connecting beam on the same side through the connecting member;

[0010] The connecting members on each side include a first connecting member connecting the battery pack and the connecting beam together, and a second connecting member connecting the battery pack, the connecting beam and the threshold beam together.

[0011] Further, a threaded tube is provided in the connecting beam corresponding to the first connecting member, and the first connecting member is connected to the threaded tube to connect the connecting bracket and the connecting beam together; and / or,

[0012] A threaded sleeve is provided in the connecting beam corresponding to the second connecting member, and the second connecting member passes through the threaded sleeve to connect the connecting bracket, the connecting beam and the threshold beam together.

[0013] Furthermore, the front and rear ends of the connecting beam on each side are connected to the threshold beam on the same side.

[0014] Further, the connecting beams on both sides are connected between a front subframe located at the front of the vehicle and a rear subframe located at the rear of the vehicle;

[0015] The front subframe is arranged below the front engine room in the vehicle body, the rear subframe is arranged below the rear floor in the vehicle body, and the front subframe, the rear subframe and the connecting beams on both sides form a battery pack installation space for accommodating the battery pack.

[0016] Furthermore, the front sub-frame has front sub-frame longitudinal beams disposed on the left and right sides, and the rear sub-frame has rear sub-frame longitudinal beams disposed on the left and right sides;

[0017] In the left-right direction of the whole vehicle, the connecting beams on each side are located on the side of the front sub-frame longitudinal beam and the rear sub-frame longitudinal beam on the same side close to the outside of the vehicle.

[0018] Furthermore, a front crossbeam is provided at the rear side of the front subframe, the front crossbeam has a crossbeam body, and both left and right ends of the crossbeam body are connected with an extension section;

[0019] The overhanging section extends toward one side outside the vehicle along the left-right direction of the whole vehicle, and the front sub-frame longitudinal beams on both sides are connected to the cross beam body, and the connecting beams on both sides are respectively connected to the overhanging section on the corresponding side, and are connected to each of the front sub-frame longitudinal beams through the front cross beam.

[0020] Furthermore, the rear end of the connecting beam on each side is provided with an inclined connecting section, and the connecting beam on each side is connected to the front end of the rear sub-frame longitudinal beam on the same side through the connecting section, and the distance between the connecting sections on both sides is gradually reduced from front to rear in the front-to-rear direction of the vehicle;

[0021] A rear cross beam is connected between the positions where the rear subframe longitudinal beams on both sides are connected to the connecting sections, and the battery pack installation space is formed between the front cross beam, the rear cross beam and the connecting beams on both sides.

[0022] Furthermore, in the left-right direction of the vehicle, a side of the connecting beam on each side facing outward from the vehicle is connected to a side step mounting plate, the side step mounting plate extends along the front-rear direction of the vehicle, and a side step mounting surface is provided on the top of the side step mounting plate.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The vehicle chassis structure described in the present invention, by arranging connecting beams distributed on the left and right sides of the battery pack, can use the connecting beams on both sides to withstand the collision impact and transmit and disperse the collision force when the vehicle collides sideways. This helps to improve the safety of the battery pack during side collisions, thereby helping to improve the safety quality of the vehicle.

[0025] In addition, connecting brackets are provided on both sides of the battery pack, and the connecting brackets on each side are connected to the bottom of the connecting beam through connecting members, which can facilitate the connection between the battery pack and the connecting beam. By making the connecting members on each side also include a second connecting member that can connect the battery pack, the connecting beam and the threshold beam together, it is also possible to simultaneously realize the installation of the whole body consisting of the connecting beams on both sides and the battery pack in the vehicle body on the basis of realizing the installation of the battery pack, thereby utilizing the integrated design of the partial installation structure of the battery pack, without having to separately set the connection structure between the connecting beam and the vehicle body on both sides of the battery pack, thereby facilitating the reduction of the cost of the vehicle installation structure.

[0026] The threaded sleeve or threaded tube is arranged in the connecting beam, which can facilitate the connection setting of the first connecting member and the second connecting member and realize the corresponding connection function. The front and rear ends of the connecting beam are connected to the threshold beam, which can realize the setting of the connecting beams on both sides in the vehicle body and ensure the reliability of the setting of the connecting beams in the vehicle body.

[0027] Secondly, the connecting beams on both sides are connected between the front and rear subframes, and the front subframe, the rear subframe and the connecting beams on both sides jointly define the battery pack installation space, which can have the characteristics of a load-bearing body structure, can take advantage of the smaller weight of the load-bearing body, is conducive to achieving lightweight body, can improve the endurance of the whole vehicle, at the same time, with the help of the connection setting of the connecting beams on both sides, a battery pack ring frame structure is formed, and the battery pack can also move with the ring frame structure during a collision, thereby reducing the collision impact on the battery pack and increasing the collision safety of the battery pack.

[0028] The connecting beams on each side are located on the same side of the front subframe longitudinal beam and the side of the rear subframe longitudinal beam close to the outside of the vehicle, which helps to achieve the change of the Y-direction cross section of the front and rear parts of the load-bearing body, and meets the matching design requirements between the chassis and the body frame in the load-bearing body. The front cross beam is arranged on the rear side of the front subframe, and the connecting beam is connected to each front subframe longitudinal beam through the front cross beam, which is conducive to the connection between the connecting beam and the front subframe, and can facilitate the change of the Y-direction cross section of the front part of the body.

[0029] In addition, an inclined connecting section is provided at the rear end of each side connecting beam, which is also beneficial to the connection with the rear subframe longitudinal beam, and the distance between the connecting sections on both sides is gradually reduced from front to rear, which is beneficial to realize the Y-direction cross-sectional change of the rear part of the load-bearing body, so as to meet the matching design requirements between the chassis and the body frame in the load-bearing body.

[0030] The rear crossbeam not only increases the structural strength and rigidity of the front part of the rear subframe, but also provides a mounting point for the rear end of the battery pack. The battery pack mounting space is formed between the front crossbeam, the rear crossbeam and the connecting beams on both sides, which is also conducive to making the formed annular frame structure a rigid embracing structure, thereby better improving the collision safety of the battery pack. By connecting the side step mounting plate to the outside of the connecting beam, it can serve as a side collision energy absorption structure while serving as the side step assembly basis, playing a role in collision energy absorption, and can achieve dual purposes, saving the side step mounting frame, which is conducive to the lightweight design of the vehicle body.

[0031] Another object of the present invention is to provide a vehicle, wherein the vehicle chassis structure as described above is provided in the vehicle.

[0032] The vehicle described in the present invention has the same beneficial effects as the above-mentioned vehicle chassis structure, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 A schematic diagram of a vehicle chassis structure according to an embodiment of the present invention when assembled in a vehicle body;

[0035] Figure 2 A schematic diagram of a vehicle chassis structure according to an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the structure of a battery pack according to an embodiment of the present invention;

[0037] Figure 4 A connection schematic diagram of a first connecting member according to an embodiment of the present invention;

[0038] Figure 5 A connection schematic diagram of a second connecting member according to an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the structure of the battery pack installation space according to an embodiment of the present invention;

[0040] Figure 7 It is a structural schematic diagram of the front subframe according to an embodiment of the present invention;

[0041] Figure 8 It is a structural schematic diagram of the rear subframe according to an embodiment of the present invention;

[0042] Fig. 9 is a schematic cross-sectional view of a connecting beam according to an embodiment of the present invention;

[0043] Fig.10 It is a structural schematic diagram of the rear cross beam according to an embodiment of the present invention;

[0044] Fig.11 It is a schematic structural diagram of a rear subframe anti-collision beam and a rear subframe energy absorption box according to an embodiment of the present invention;

[0045] Fig.12 It is a schematic diagram of the arrangement of the side step mounting plate according to an embodiment of the present invention;

[0046] Fig.13 for Fig.12 Schematic diagram of the structure of the middle part;

[0047] Fig.14 This is a schematic diagram of the structure when the side step mounting plate and the connecting beam according to an embodiment of the present invention are made of extruded aluminum;

[0048] Fig.15 It is a structural schematic diagram of a side step mounting plate and a connecting beam according to an embodiment of the present invention when a steel roll-pressed structure is adopted;

[0049] Fig.16 A schematic diagram of a connecting beam length adjustment structure according to an embodiment of the present invention;

[0050] Description of reference numerals:

[0051] 1. Connecting beam; 2. Battery pack; 3. Door sill beam; 4. Front subframe; 5. Rear subframe; 6. Side step mounting plate;

[0052] 1a, connecting section; 1b, transverse reinforcement rib; 1c, longitudinal beam segment; 1d, fixed structure; 201, connecting bracket; 202, front end mounting bracket; 203, rear end mounting bracket; 401, front subframe longitudinal beam; 402, front subframe front cross beam; 403, front subframe middle cross beam; 404, front cross beam; 404a, cross beam body; 404b, overhanging section; 405, front subframe anti-collision beam; 406, front subframe energy absorption box; 501, rear subframe longitudinal beam; 502, rear subframe front cross beam; 503, rear subframe rear cross beam; 504, rear cross beam; 5041, straight section; 5042, bending section; 505, rear subframe anti-collision beam; 506, rear subframe energy absorption box; 6a, side step mounting surface; 6b, collapse guide rib; 6c, vertical reinforcement rib;

[0053] 100, threaded pipe; 200, first connecting piece; 300, threaded sleeve; 400, second connecting piece;

[0054] A, length adjustment position; B, longitudinal beam connection position; Q, battery pack installation space; m, second connecting piece connection position; n, first connecting piece connection position. DETAILED DESCRIPTION

[0055] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0056] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0058] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0059] Embodiment 1

[0060] The present embodiment relates to a vehicle chassis structure, which is applied to a new energy vehicle model with a battery pack, preferably a pure electric vehicle model, and the vehicle chassis structure can increase the safety of the battery pack during a side collision of the vehicle, and is also conducive to reducing the cost of the entire vehicle installation structure.

[0061] In terms of overall structure, combined Figures 1 to 5 As shown in , the vehicle chassis structure of this embodiment includes connecting beams 1 arranged on the left and right sides, and a battery pack 2 located between the connecting beams 1 on both sides.

[0062] The connecting beams 1 on both sides extend along the front-rear direction of the vehicle and are respectively arranged below the sill beam 3 on the same side of the vehicle body. Connectors are respectively arranged on the left and right sides of the battery pack 2, and the battery pack 2 is also connected to at least one of the connecting beam 1 and the sill beam 3 through the above-mentioned connecting components.

[0063] At this time, as set above, by setting the connecting beams 1 distributed on the left and right sides of the battery pack 2, when the vehicle collides sideways, this embodiment can use the connecting beams 1 on both sides to withstand the collision impact and transmit and disperse the collision force, thereby helping to improve the safety of the battery pack 2 during side collision.

[0064] Based on the above overall introduction, specifically, Figures 2 to 5 As shown in , as a preferred implementation form, in this embodiment, each side connecting member includes a first connecting member 200 connecting the battery pack 2 and the connecting beam 1 together, and a second connecting member 400 connecting the battery pack 2, the connecting beam 1 and the threshold beam 3 together.

[0065] In this way, by making the connecting parts on each side also include the second connecting part 400 that can connect the battery pack 2, the connecting beam 1 and the door sill beam 3 together, it is also possible to simultaneously realize the installation of the battery pack 2 while realizing the installation of the whole consisting of the connecting beams 1 on both sides and the battery pack 2 in the vehicle body. Therefore, this embodiment can also utilize the integrated design of the partial installation structure of the battery pack 2, and there is no need to separately set the connection structure between the connecting beam 1 and the vehicle body on both sides of the battery pack 2, so as to reduce the cost of the installation structure of the whole vehicle.

[0066] It should be noted that, in addition to making the connector divided into the above two types of first connector 200 and second connector 400, so as to be able to connect the battery pack 2 to the connecting beam 1, and to simultaneously connect the battery pack 2 to the connecting beam 1 and the threshold beam 2. Of course, in specific implementation, it is also possible to connect the battery pack 2 only to the threshold beam 3 through the connector, and at this time, the connector can be adjusted to connect to the threshold beam 3 through one side of the connecting beam 1 or through the via hole in the connecting beam 1. However, it is still preferred that the connector adopts the above two connection methods of the first connector 200 and the second connector 400.

[0067] In this embodiment, as a preferred implementation form, this embodiment is provided with connecting brackets 201 on the left and right sides of the battery pack 2, and the connecting brackets 201 on each side are connected to the bottom of the connecting beam 1 on the same side through a connecting piece to achieve connection between the side of the battery pack 2 and the connecting beam 1, or between the connecting beam 1 and the rocker beam 3 in the vehicle body.

[0068] It is understandable that by arranging the connection brackets 201 on both sides of the battery pack 2 and connecting the connection brackets 201 on each side to the bottom of the connection beam 1 through a connecting piece, it is possible to facilitate the connection between the battery pack 2 and the connection beam 1.

[0069] In a specific implementation, the connection brackets 201 on the left and right sides of the battery pack 2 can be fixedly connected to the outer frame of the battery pack 2, and preferably, the connection brackets 201 on both sides and the outer frame of the battery pack 2 can be made of extruded aluminum profiles, and the connection brackets 201 and the side parts of the outer frame are integrally formed. This arrangement can facilitate the preparation of the connection brackets 201, and can also ensure the structural strength of the connection brackets 201, which is conducive to ensuring the reliability of the battery pack 2 after assembly.

[0070] In this embodiment, as a preferred implementation form, during specific implementation, the second connecting member 400 connecting the battery pack 2, the connecting beam 1 and the threshold beam 3 can generally be distributed at the four front and rear corners close to the battery pack 2, that is, the second connecting member 400 on each side is arranged at Figure 2 The position indicated by the reference numeral m shown in FIG. As for the first connecting member 200 that only connects the battery pack 2 and the connecting beam 1 together, it can be provided as a plurality of spaced distributions, and can be arranged, for example, at Figure 2 The position indicated by the label n.

[0071] Continue as Figure 4 As shown in the figure, in this embodiment, as a preferred implementation form, a threaded tube 100 is also provided in the connecting beam 1 corresponding to each first connecting member 200, and each first connecting member 200 is connected to the corresponding threaded tube 100, thereby connecting the connecting bracket 201 and the connecting beam 1 together.

[0072] Similar to the first connecting member 200, in this embodiment, a threaded sleeve 300 is also provided in the connecting beam 1 corresponding to each second connecting member 400. The top of the threaded sleeve 300 extends out of the connecting beam 1 and abuts against the bottom of the threshold beam 3, and each second connecting member 400 passes through the corresponding threaded sleeve 300 to connect the connecting bracket 201, the connecting beam 1 and the threshold beam 3 together.

[0073] At this point, it can be understood that by setting the threaded sleeve 300 or the threaded tube 100 in the connecting beam 1, it is convenient to realize the connection setting of the first connecting member 200 and the second connecting member 400, so as to realize the corresponding connection function and assemble the battery pack 2 in the vehicle body. In specific implementation, the threaded sleeve 300 or the threaded tube 100 can adopt the existing tube structure with the inner wall formed with connecting threads, and the first connecting member 200 and the second connecting member 400 can adopt bolts of appropriate length, and the threshold beam 3 can be provided with a projection welding nut or a similar structure to connect with the second connecting member 400.

[0074] In this embodiment, as a feasible implementation form, the front and rear ends of the connecting beams 1 on each side can be connected to the sill beam 3 on the same side, and the connection can be made by welding, screwing or riveting. In this case, the front and rear ends of the connecting beam 1 are connected to the sill beam 3, so that the connecting beams 1 on both sides can be arranged in the vehicle body, and the reliability of the connection beams 1 in the vehicle body can be ensured.

[0075] In addition to connecting the two ends of the connecting beam 1 on each side to the threshold beam 3 on the same side, as another feasible implementation form, this embodiment still consists of Figure 2 , and combined with Figure 6As shown in , the connecting beams 1 on both sides can also be connected between the front subframe 4 located at the front of the vehicle and the rear subframe 5 located at the rear of the vehicle. The front subframe 4 is arranged below the front engine room in the vehicle body, and the rear subframe 5 is arranged below the rear floor in the vehicle body. At the same time, the front subframe 4, the rear subframe 5 and the connecting beams 1 on both sides also enclose and form a battery pack installation space Q for accommodating the battery pack 2.

[0076] At this time, based on the above setting of the two side connecting beams 1 between the front and rear subframes, it should be noted that the existing traditional car body mainly includes a load-bearing body and a non-load-bearing body, and the difference between the two lies mainly in the structure, weight and ride comfort.

[0077] Among them, the non-load-bearing body is generally composed of two parts: the frame beam and the body. The frame is responsible for installing the engine, gearbox, suspension and other components, and the body is only responsible for providing a closed environment required for driving and riding, and does not play a role in bearing capacity. At the same time, the non-load-bearing body is heavy, has a high center of gravity, relatively poor handling, and is less comfortable when driving on paved roads. However, because the frame beam can provide good rigidity, the chassis is strong, has good anti-bumping performance, has good stability and safety, and is also easy to modify.

[0078] The monocoque has no rigid frame, and all the parts in the vehicle are directly mounted on the body. The body as a whole is a load-bearing structure that bears various loads. At the same time, the monocoque is light, has a low center of gravity, good handling, and is easy to assemble. It can also provide better comfort when driving on paved roads. However, the monocoque has weak torsional rigidity and load-bearing capacity, and because it has no rigid frame, it usually only strengthens the front, side, rear, and floor panels, and its overall safety is relatively poor.

[0079] Therefore, for new energy vehicles, especially pure electric 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 connects the two side connecting beams 1 between the front and rear subframes in the vehicle chassis structure, thereby making the vehicle chassis of this embodiment a chassis structure developed based on the load-bearing body.

[0080] It is understandable that by adopting a load-bearing body structure with front and rear subframes, this embodiment can utilize the characteristics of the load-bearing body with a small weight to achieve lightweight body, thereby improving the endurance of the whole vehicle. At the same time, by setting the connecting beams 1 on both sides, the front and rear subframes are connected into one, and the front subframe 4, the rear subframe 5 and the connecting beams 1 on both sides jointly define the battery pack installation space Q, which can also form a battery pack annular frame structure with the help of the connection setting of the connecting beams 1, so that the battery pack 2 can move with the annular frame structure when the vehicle collides, thereby reducing the collision impact on the battery pack 2, so as to achieve the effect of increasing the collision safety of the battery pack 2.

[0081] In this embodiment, the front sub-frame 4 has front sub-frame longitudinal beams 401 disposed on the left and right sides, and the rear sub-frame 5 has rear sub-frame longitudinal beams 501 disposed on the left and right sides. In addition, as a preferred implementation form, in the left-right direction of the whole vehicle, the connecting beams 1 on each side are also located on the side of the front sub-frame longitudinal beam 401 and the rear sub-frame longitudinal beam 501 on the same side close to the outside of the vehicle.

[0082] At this time, make the connecting beams 1 on each side Figure 2 as well as Figure 6 As shown in the figure, the front sub-frame longitudinal beam 401 and the rear sub-frame longitudinal beam 501 are located on the same side close to the outside of the vehicle. This embodiment helps to achieve the Y-direction cross-sectional change of the front and rear parts of the load-bearing body, and can meet the matching design requirements between the chassis and the body frame in the load-bearing body.

[0083] In addition, in this embodiment, a front cross beam 404 is also provided at the rear of the front sub-frame 4, and the front ends of the connecting beams 1 on both sides are respectively connected to the left and right ends of the front cross beam 404, and the rear ends of the connecting beams 1 on both sides are respectively connected to the front ends of the rear sub-frame longitudinal beams 501 on both sides. In this way, the front cross beam 404, the rear sub-frame 5, and the connecting beams 1 on both sides jointly define a battery pack installation space Q for installing the battery pack 2.

[0084] It should be pointed out that, as a preferred implementation form, the front cross beam 404 can be used as a part of the front sub-frame 4, and specifically as a front sub-frame rear cross beam located at the rear end of the front sub-frame 4. However, in addition to being the front sub-frame rear cross beam, the front cross beam 404 of this embodiment can also be connected between the front ends of the connecting beams 1 on both sides, and be independent of the beam structure provided on the front sub-frame 4. In this case, while the front cross beam 404 is integrated with the connecting beams 1 on both sides to form an integrated frame structure, it is also connected to the front sub-frame 4 to achieve the connection between the connecting beams 1 on both sides and the front sub-frame 4.

[0085] Taking the front cross beam 404 as the rear cross beam of the front subframe as an example, in specific implementation, the front subframe 4 of this embodiment can refer to the front subframe structure of the existing load-bearing body, and generally speaking, Figure 7 As shown in the figure, the front sub-frame 4 has front sub-frame longitudinal beams 401 arranged on the left and right sides, a front sub-frame front cross beam 402 and a front sub-frame middle cross beam 403 are connected between the front sub-frame longitudinal beams 401 on both sides, and the rear ends of the front sub-frame longitudinal beams 401 on both sides are connected to a front cross beam 404 which is a front sub-frame rear cross beam.

[0086] It should be noted that when the front cross beam 404 is independently provided from the front sub-frame 4, the connection between the front cross beam 404 and the front sub-frame 4 is generally connected to the rear ends of the front sub-frame longitudinal beams 401 on both sides. Moreover, when the front cross beam 404 is independently provided from the front sub-frame 4, the front sub-frame rear cross beam in the front sub-frame 4 can be selectively provided as required.

[0087] Continue as Figure 7 As shown, in this embodiment, a front sub-frame anti-collision beam 405 connected to the front sub-frame longitudinal beams 401 on both sides is also provided at the front end of the front sub-frame 4, and the front sub-frame anti-collision beam 405 is specifically connected to the front ends of the front sub-frame longitudinal beams 401 on each side through the front sub-frame energy absorption box 406.

[0088] In addition, as a preferred implementation form, in the front sub-frame 4 of this embodiment, the front cross beam 404 also has a cross beam body 404a located in the middle, and an extension section 404b connected to the left and right ends of the cross beam body 404a. The rear end of each side of the front sub-frame longitudinal beam 401 is connected to the cross beam body 404a, and the extension section 404b at each end extends to the outside of the vehicle along the left and right direction of the whole vehicle, and the front end of each side connecting beam 1 is also specifically connected to the extension section 404b on the same side.

[0089] It can be understood that, by providing the extension section 404a in the front cross beam 404, it can facilitate the connection with the connecting beams 1 on both sides. Figure 6 By connecting the front sub-frame longitudinal beams 401 on the left and right sides of the front sub-frame 4 with the cross beam body 404a in the front cross beam 404, it is also helpful to achieve the change of the Y-direction (left-right direction of the whole vehicle) cross section of the front part of the load-bearing body, that is, the connecting beams 1 on each side and the front sub-frame longitudinal beams 401 are not in a straight line, but are bent at the connecting position between the two, thereby reducing the Y-direction cross section size of the body at the front sub-frame 4.

[0090] The above-mentioned change in the Y-direction cross-section of the front part of the vehicle body is obviously fundamentally different from the Y-direction cross-section of the frame beam in the non-load-bearing body that is basically consistent front and rear. In addition, the present embodiment meets the matching design requirements between the chassis and the body frame in the load-bearing body through the size change of the above-mentioned Y-direction cross-section of the front part of the vehicle body.

[0091] In this embodiment, still combined with Figure 6 and Figure 8As shown in the figure, as a preferred embodiment, the rear end of each side connecting beam 1 is provided with an inclined connecting section 1a, and each side connecting section 1a is connected to the front end of the rear sub-frame longitudinal beam 501 on the same side through the connecting section 1a, and the distance between the connecting sections 1a on both sides is gradually reduced from front to rear in the front-to-rear direction of the vehicle.

[0092] At this time, by setting an inclined connecting section 1a at the rear end of each side connecting beam 1, it can also facilitate the connection between the connecting beam 1 and the rear subframe longitudinal beam 501, and make the distance between the connecting sections 1a on both sides gradually decrease from front to rear. Similar to the design of the above-mentioned overhanging section 404b, it can also facilitate the realization of the Y-direction cross-sectional change of the rear part of the load-bearing body, so as to not only meet the matching design requirements between the chassis and the body frame in the load-bearing body, but also become one of the main differences from the non-load-bearing body.

[0093] In this embodiment, it is worth noting that, in a specific implementation, the connecting beams 1 on both sides can be, for example, an integrally formed beam structure, and specifically an integral closed structure, and its cross section can be as follows: Fig. 9 As shown in . Moreover, at this time, the connecting beam 1 can also be integrally formed with the front cross beam 404 and the rear subframe longitudinal beam 501 in the front and rear subframes. At this time, it can be understood that by using a closed cross section, it can ensure the structural strength of the connecting beam 1 itself by virtue of the high strength of the cavity structure, and by integrally forming the connecting beam 1 with the front and rear subframes, the front subframe 4, the connecting beam 1 and the rear subframe 5 after being connected as one can have better structural strength and rigidity.

[0094] Of course, in addition to being an integrated structure, the connecting beam 1 of this embodiment can also adopt other structures, and for example, it can adopt a steel profile welding structure, an aluminum alloy profile extrusion structure, etc. In addition, in addition to being integrally connected with the front cross beam 404 and the rear subframe longitudinal beam 501, in specific implementation, it is also possible to set the connecting beam 1 in a detachable manner. In this case, the above-mentioned detachable manner can generally adopt a screw connection structure, and combined with Fig.13 As shown, the connection position can be located at B near the four corners, and the connection direction can be X direction (front and rear direction of the whole vehicle) or Y direction, and the connection method can be plug-in or flat-panel docking.

[0095] Of course, in order to ensure the reliability of force transmission of the connecting beam 1, the above connection direction is preferably the X direction. At the same time, in order to ensure the convenience of operation, the connection method is also preferably flat plate docking. Fig.13 At the positions indicated by the reference numerals B, the connection beams 1 on each side can be arranged by means of a flat plate docking method and a screw connection structure connected along the X direction.

[0096] In this embodiment, continue to refer to Figure 6 as well as Figure 8As shown, in the specific implementation, the rear subframe 5 can also refer to the rear subframe structure in the existing load-bearing body, and in terms of structure, as a preferred implementation form, in addition to being similar to the existing rear subframe structure, a rear subframe front cross beam 502 and a rear subframe rear cross beam 503 are connected between the rear subframe longitudinal beams 501 on both sides, and further, a rear cross beam 504 is also connected between the position where the rear subframe longitudinal beams 501 on both sides are connected to the connecting beam 1, that is, between the connection position between the rear subframe longitudinal beams 501 on both sides and the connecting section 1a.

[0097] At this time, based on the setting of the rear cross beam 504, the battery pack installation space Q is formed between the rear cross beam 504, the front cross beam 404 and the connecting beams 1 on both sides. Moreover, based on the setting of the front cross beam 404 and the rear cross beam 504, in specific implementation, the battery pack installation points can be respectively provided on the front cross beam 404 and the rear cross beam 504, and at the same time, the front end mounting bracket 202 and the rear end mounting bracket 203 are respectively provided at the front and rear ends of the battery pack 2, so that the front end of the battery pack 2 can be installed on the front cross beam 404 via bolts, and the rear end of the battery pack 2 can also be installed on the rear cross beam 504 via bolts, thereby ensuring the stability of the battery pack 2 after being assembled in the vehicle body.

[0098] It can be understood that, through the arrangement of the above-mentioned rear cross beam 504, not only the structural strength and rigidity of the front part of the rear subframe 5 can be increased, and a mounting point can be provided for the rear end of the battery pack, but also, by forming the battery pack mounting space Q between the rear cross beam 504, the front cross beam 404 and the connecting beams 1 on both sides, this embodiment is also conducive to making the formed annular frame structure a rigid embracing structure adapted to the shape of the battery pack, thereby better improving the collision safety of the battery pack.

[0099] In addition, the rear cross beam 504 is arranged between the connection positions of the connecting sections 1a on both sides and the rear sub-frame longitudinal beam 501. By connecting the ends of the rear cross beam 504 to the connection positions between the connecting sections 1a on each side and the rear sub-frame longitudinal beam 501, it not only helps to ensure the connection strength of the rear cross beam 504, but also helps to better improve the dynamic stiffness of the front position of the rear sub-frame 5.

[0100] In specific implementation, the rear cross beam 504 of this embodiment may also adopt an integrally formed closed structure, so that it has a higher structural strength. In addition, in order to further increase the strength of the rear cross beam 504 and to facilitate the installation of the rear end of the battery pack, the rear cross beam 504 is provided with a plurality of rear cross beams 504, each of which is provided with a plurality of rear cross beams 504. Fig.10 As shown in , the rear cross beam 504 of this embodiment can be designed to be arched downward along the vertical direction of the whole vehicle, and have a straight section 5041 located in the middle, and bent sections 5042 located on the left and right sides. The bent sections 5042 on both sides are inclined upward and are respectively connected to the rear subframe longitudinal beam 501 on the same side.

[0101] Still by Figure 6 and Figure 8 As shown, as a preferred implementation form, different from the existing rear sub-frame structure, this embodiment is provided with a rear sub-frame anti-collision beam 505 connected to the rear sub-frame longitudinal beams 501 on both sides at the rear end of the rear sub-frame 5. In this way, it can be understood that by arranging the rear sub-frame anti-collision beam 505 at the rear end of the rear sub-frame 5, on the one hand, it can improve the rear collision force transmission performance of the rear sub-frame 5, and can make the collision force better dispersed to the rear sub-frame longitudinal beams 501 on both sides through the rear sub-frame anti-collision beam 505, so as to be transmitted forward along the rear sub-frame longitudinal beam 501, avoiding single-position force, collision force is difficult to disperse, and deformation is too large. On the other hand, by arranging the above-mentioned rear sub-frame anti-collision beam 505, the rear sub-frame anti-collision beam 505 can also be used as a pedestrian anti-rolling beam at the rear of the vehicle, thereby improving the safety during the reversing process.

[0102] It should be noted that in the specific implementation, Fig.11 As shown, the structure of the rear subframe anti-collision beam 505 can refer to the front subframe anti-collision beam 405 in the front subframe 4, and it can adopt a sheet metal stamping structure, or it can also adopt an aluminum alloy extrusion profile. At the same time, on the basis of setting the rear subframe anti-collision beam 505, preferably, the rear ends of the rear subframe longitudinal beams 501 on both sides can also be connected to the rear subframe energy absorption box 506, and the rear subframe anti-collision beam 505 is specifically connected to the rear subframe energy absorption box 506 on both sides.

[0103] At this time, the rear subframe energy absorption box 506 is the same as the front subframe energy absorption box 406 in the front subframe 4, and both adopt the conventional energy absorption box structure used in the existing vehicle body. And it can be understood that, by connecting the rear subframe rear anti-collision beam 505 with the rear subframe longitudinal beam 501 through the rear subframe energy absorption box 506, it can be crushed and energy absorbed through the rear subframe energy absorption box 506, so as to further improve the rear collision safety of the vehicle.

[0104] In addition, it should be noted that, through the provision of the above-mentioned rear subframe anti-collision beam 505, it can not only cooperate with the front subframe anti-collision beam 405 at the front end, so that the chassis structure of this embodiment can obtain better head-on and rear-end collision safety performance, but also, when the chassis structure of this embodiment is assembled into the whole vehicle, the above-mentioned front subframe anti-collision beam 405 and the rear subframe anti-collision beam 505 can form an upper and lower double anti-collision beam collision force transmission design together with the front and rear anti-collision beams in the upper body frame, thereby providing super strong double protection.

[0105] like Fig.12 and Fig.13As shown in the figure, in this embodiment, as a preferred implementation form, in the left-right direction of the vehicle, the side of each side connecting beam 1 facing outward from the vehicle can be further connected to a side step mounting plate 6. The side step mounting plate 6 on each side extends along the front-rear direction of the vehicle, and a side step mounting surface 6a is provided on the top of each side step mounting plate 6.

[0106] At this time, by installing the side step panel and the side step decoration on the side step installation surface 6a, a side step can be formed to assist the driver and passengers in getting on and off the vehicle. In addition, by connecting the side step installation plate 6 to the outside of the connecting beam 1, it can be understood that it can be used as a side collision energy absorption structure while serving as a side step assembly basis, thereby achieving dual purposes, saving the side step installation frame, and also facilitating the lightweight design of the vehicle body.

[0107] In the specific implementation, it should be noted that the side step mounting plates 6 on each side can be detachably connected to the connecting beam 1 on the same side through a connecting assembly, for example. In this way, the side step mounting plates 6 on each side can be detachably connected to the connecting beam 1 on the same side through the connecting assembly, which can facilitate the assembly of the side step mounting plates 6 and also facilitate the maintenance and replacement of the side step mounting plates 6 in the later stage.

[0108] Of course, in addition to the above detachable setting, in specific implementation, this embodiment can also make the side step mounting plate 6 on each side integrally formed with the same-side connecting beam 1. In this way, the side step mounting plate 6 and the connecting beam 1 are integrally formed, which can reduce the preparation cost of the connecting beam 1 and the side step mounting plate 6, and can also better ensure the structural strength of the connecting beam 1 and the side step mounting plate 6, so as to help improve the overall rigidity of the chassis structure.

[0109] As for the detachable side step mounting plate 6, specifically, it can be, for example, a steel profile or an aluminum alloy profile, and the connection assembly can generally adopt a screw connection structure to fix the side step mounting plate 6 to the connecting beam 1. As for the side step mounting plate 6 and the connecting beam 1 being integrally formed, for example, the side step mounting plate 6 and the connecting beam 1 can both be made of a steel profile or an aluminum alloy profile, or the side step mounting plate 6 and the connecting beam 1 can also be made of a steel roll-pressed structure.

[0110] like Fig.14 As shown in FIG. 1 , it is an exemplary structure when both the side step mounting plate 6 and the connecting beam 1 are made of aluminum alloy profiles. In this structural form, in order to increase the structural strength of the connecting beam 1 and the side step mounting plate 6, transverse reinforcing ribs 1b and vertical reinforcing ribs 6c can be respectively provided in the two. At the same time, in order to enhance the collision energy absorption effect of the side step mounting plate 6 when the vehicle is hit from the side, a collapsing guide rib 6b extending in a bent shape can also be provided at the bottom of the side step mounting plate 6.

[0111] At this time, vertical reinforcing ribs 6c and crush guiding ribs 6b are used for the reinforcing ribs at the side step mounting plate 6. While appropriately increasing the structural strength at the position of the side step mounting plate 6, it also endows the side step mounting plate 6 with good crush energy absorption capacity, enabling one side of the side step mounting plate 6 to become a crush energy absorption area, which helps to improve the side impact energy absorption effect. Different from one side of the side step mounting plate 6, on one side of the connecting beam 1, through the arrangement of the transverse reinforcing rib 1b, by utilizing the transverse supporting effect of the transverse reinforcing rib 1b, the connecting beam 1 can have strong supporting stiffness when the vehicle undergoes a side impact. Furthermore, it can make one side of the connecting beam 1 become a rigid frame area to better protect the battery pack located in the battery pack installation space Q.

[0112] In this embodiment, in addition to as Fig.14 shown, the integrally formed connecting beam 1 and side step mounting plate 6 have different cross-sectional structures. Of course, in specific implementation, the wall thickness on one side of the connecting beam 1 can also be made greater than that on one side of the side step mounting plate 6. In this way, the strength on one side of the connecting beam 1 can be further increased, so as to make full use of the crush energy absorption on one side of the side step mounting plate 6 to protect the battery pack inside the connecting beam 1.

[0113] Such as Fig.15 shown is an exemplary cross-sectional form when the above-mentioned side step mounting plate 6 and connecting beam 1 adopt a steel rolling structure. It should be noted that when adopting the rolling structure, the integrally formed side step mounting plate 6 and connecting beam 1 generally adopt the Fig.15 shown "day" - shaped cross-section and can be connected by a combination of laser welding and spot welding. However, in addition to adopting the "day" - shaped cross-section, of course, it is also possible to make the roll-formed side step mounting plate 6 and connecting beam 1 adopt other cross-sectional forms.

[0114] In this embodiment, based on the arrangement of the two connecting beams 1, in addition to making the two connecting beams 1 an integral structure, as a preferred implementation form, it is also possible to set the lengths of the two connecting beams 1 along the front - rear direction of the whole vehicle to be adjustable, and at the same time, fixing structures 1d are respectively arranged on the two connecting beams 1 to fix the adjusted lengths of the connecting beams 1 through the fixing structures 1d. At this time, by making the lengths of the two connecting beams 1 adjustable and setting the fixing structures for fixing the lengths of the connecting beams 1, it can facilitate meeting the wheelbase changes between different vehicle models, making the front and rear subframes common parts, and further contributing to the realization of platform design to reduce the overall vehicle R & D cost.

[0115] During specific implementation, the length adjustment positions of the two connecting beams 1 can be as indicated by the reference numeral A in Figure 1 , and, as Fig.16As shown in , in order to achieve the adjustable length of the connecting beam 1, for example, the two longitudinal beam segments 1c disconnected at the position marked A can be connected by plugging, and at the same time, the above-mentioned fixing structure 1d can be fixed in the form of a threaded sleeve and a bolt.

[0116] The threaded sleeve can be fixed in one of the longitudinal beam segments 1c, and connecting holes are respectively provided on the two longitudinal beam segments 1c, and the connecting holes on the outer longitudinal beam segment 1c are arranged in a plurality of intervals. When adjusting the length of the connecting beam 1, after the insertion length of the two longitudinal beam segments 1c is adjusted, the bolt is screwed into the threaded sleeve through the connection process, so that the length of the connecting beam 1 can be adjusted and the adjusted length of the connecting beam 1 can be fixed.

[0117] In addition, it should be noted that when the length of the connecting beams 1 on both sides is adjustable, the side step mounting plate 6 disposed on the side of each side connecting beam 1 facing the outside of the vehicle should be detachably connected to the connecting beam 1. In specific implementation, the side step mounting plate 6 of a suitable length can be manufactured according to the adjusted length of the connecting beam 1, and then connected to the outside of the connecting beam 1 after the length of the connecting beam 1 is fixed.

[0118] The chassis structure of the present embodiment adopts the above structure, and by setting connecting beams 1 distributed on the left and right sides of the battery pack 2, when the vehicle collides sideways, the connecting beams 1 on both sides can be used to withstand the collision impact and transmit and disperse the collision force, which helps to improve the safety of the battery pack 2 during side collision. At the same time, by making the connecting parts on each side also include a second connecting part 400 that can connect the battery pack 2, the connecting beam 1 and the threshold beam 3 together, it is also possible to simultaneously realize the installation of the battery pack 2 while realizing the installation of the whole consisting of the connecting beams 1 on both sides and the battery pack 2 in the vehicle body. In this way, the integrated design of the partial installation structure of the battery pack 2 can be utilized, and there is no need to separately set the connection structure between the connecting beam 1 and the vehicle body on both sides of the battery pack 2, which is beneficial to reduce the cost of the whole vehicle installation structure.

[0119] In addition, on the basis of setting the connecting beams 1 on both sides, especially by connecting the connecting beams 1 on both sides between the front and rear subframes, this embodiment can connect the front and rear subframes through the connecting beams 1 on both sides on the basis of the traditional load-bearing body. In this way, by adopting a load-bearing body structure with front and rear subframes, the weight of the load-bearing body can be utilized to achieve lightweighting of the body, thereby improving the endurance of the entire vehicle.

[0120] In addition, by setting the connecting beams 1 on both sides, connecting the front and rear subframes, and defining the battery pack installation space Q by the front crossbeam 404, the rear crossbeam 504 and the connecting beams 1 on both sides, the chassis structure of this embodiment can also form a battery pack annular frame structure by means of the connection setting of the connecting beams 1. In the event of a collision, the battery pack 2 can move with the annular frame structure, which can reduce the collision impact on the battery pack 2, increase the collision safety of the battery pack 2, and thus improve the safety quality of the entire vehicle.

[0121] It should be noted that the above-mentioned chassis structure of this embodiment, since the front and rear ends of the chassis are still the front and rear sub-frames, the sub-frame structure has a smaller Y-direction section than the frame in the non-load-bearing body, and the longitudinal beam at the position of the sub-frame continues to use a curved longitudinal beam structure, making the chassis structure of this embodiment a structural innovation in the form of a sub-frame, and significantly different from the conventional non-load-bearing frame beam structure. Specifically, the front and rear sub-frames in this embodiment are still separate units, and it is just based on the front and rear sub-frames in the load-bearing body, and further adds a front and rear connecting beam 1, which is not an integrated beam structure in the non-load-bearing body.

[0122] Of course, in the implementation form where the connecting beam 1 is connected to the front and rear subframes, it is precisely because of the use of the integrated structure of the front and rear subframes connected by the connecting beam 1 that this embodiment, as mentioned above, can not only utilize the characteristics of the load-bearing body structure to reduce the body weight to increase the vehicle's endurance, but also form a battery pack annular protection frame to better improve the collision safety of the battery pack 2. Therefore, it not only improves the shortcomings of the load-bearing body structure, but also has the advantages of the non-load-bearing body structure, can well improve the overall quality of the vehicle, and has good practicality.

[0123] Embodiment 2

[0124] The present embodiment relates to a vehicle, which is specifically a new energy vehicle type provided with a battery pack, and specifically, the vehicle is preferably a pure electric vehicle type, and the vehicle chassis structure of the first embodiment is provided in the vehicle.

[0125] It should be noted that, based on the vehicle chassis structure in the first embodiment, the vehicle of this embodiment is assembled in the same manner as the existing load-bearing body assembly, that is, the bottom subframe is still assembled to the upper body, and the upper body frame is the load-bearing body in the vehicle, and the chassis accessories are also assembled to the body relying on the front and rear subframes. In addition, when the vehicle collides, the upper body frame, the front and rear subframes in the chassis, and the connecting beam 1 participate in the absorption and transmission of the collision force, instead of the frame beam alone transmitting force and absorbing energy as in the non-load-bearing body.

[0126] The vehicle of this embodiment is provided with the vehicle chassis structure of the first embodiment. On the one hand, it helps to improve the safety of the battery pack 2 during a side collision by providing the connecting beams 1 distributed on the left and right sides of the battery pack 2. At the same time, by adopting the connecting parts on each side also including the second connecting part 400 that can connect the battery pack 2, the connecting beam 1 and the threshold beam 3 together, it is also beneficial to reduce the cost of the whole vehicle installation structure.

[0127] On the other hand, in the specific setting of the connecting beams 1 on both sides, especially by connecting the connecting beams 1 between the front and rear subframes, the front and rear subframes can be connected through the connecting beams 1 on both sides on the basis of the traditional load-bearing body, which is not only conducive to achieving the lightweight of the body and improving the endurance of the whole vehicle, but also can reduce the collision impact on the battery pack 2, increase the collision safety of the battery pack 2, help to improve the safety quality of the whole vehicle, and has good practicality.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle chassis structure, characterized in that: It comprises connecting beams (1) arranged on the left and right sides, and a battery pack (2) located between the connecting beams (1) on the two sides; The connecting beams (1) on both sides extend along the front-rear direction of the vehicle and are respectively arranged below the sill beams (3) on the same side of the vehicle body; Connecting pieces are respectively provided on the left and right sides of the battery pack (2), and the battery pack (2) is connected to the connecting beam (1) and / or the door sill beam (3) via the connecting pieces.

2. The vehicle chassis structure according to claim 1, characterized in that: The left and right sides of the battery pack (2) are respectively provided with connection brackets (201), and the connection brackets (201) on each side are connected to the bottom of the connection beam (1) on the same side through the connection member; The connecting members on each side include a first connecting member (200) connecting the battery pack (2) and the connecting beam (1) together, and a second connecting member (400) connecting the battery pack (2), the connecting beam (1) and the threshold beam (3) together.

3. The vehicle chassis structure according to claim 2, characterized in that: A threaded tube (100) is provided in the connection beam (1) corresponding to the first connection member (200), and the first connection member (200) is connected to the threaded tube (100) to connect the connection bracket (201) and the connection beam (1) together; and / or, A threaded sleeve (300) is provided in the connection beam (1) corresponding to the second connection member (400); the second connection member (400) passes through the threaded sleeve (300) to connect the connection bracket (201), the connection beam (1) and the threshold beam (3) together.

4. The vehicle chassis structure according to claim 1, characterized in that: The front and rear ends of the connecting beam (1) on each side are connected to the threshold beam (3) on the same side.

5. The vehicle chassis structure according to claim 1, characterized in that: The connecting beams (1) on both sides are connected between a front subframe (4) located at the front of the vehicle and a rear subframe (5) located at the rear of the vehicle; The front subframe (4) is arranged below the front engine compartment in the vehicle body, the rear subframe (5) is arranged below the rear floor in the vehicle body, and the front subframe (4), the rear subframe (5) and the connecting beams (1) on both sides form a battery pack installation space (Q) for accommodating the battery pack (2).

6. The vehicle chassis structure according to claim 5, characterized in that: The front sub-frame (4) has front sub-frame longitudinal beams (401) disposed on the left and right sides, and the rear sub-frame (5) has rear sub-frame longitudinal beams (501) disposed on the left and right sides; In the left-right direction of the vehicle, the connecting beam (1) on each side is located on the side of the front sub-frame longitudinal beam (401) and the rear sub-frame longitudinal beam (501) on the same side close to the outside of the vehicle.

7. The vehicle chassis structure according to claim 6, characterized in that: A front crossbeam (404) is provided on the rear side of the front subframe (4), the front crossbeam (404) having a crossbeam body (404a), and both left and right ends of the crossbeam body (404a) are connected to an extension section (404b); The extended section (404b) extends toward the outside of the vehicle along the left-right direction of the vehicle, and the front sub-frame longitudinal beams (401) on both sides are connected to the cross beam body (404a), and the connecting beams (1) on both sides are respectively connected to the extended section (404b) on the corresponding side, and are connected to each of the front sub-frame longitudinal beams (401) through the front cross beam (404).

8. The vehicle chassis structure according to claim 7, characterized in that: The rear end of the connecting beam (1) on each side is provided with an inclined connecting section (1a), and the connecting beam (1) on each side is connected to the front end of the rear sub-frame longitudinal beam (501) on the same side through the connecting section (1a), and the distance between the connecting sections (1a) on both sides is gradually reduced from front to rear in the front-to-rear direction of the vehicle; A rear cross beam (504) is connected between the positions where the rear subframe longitudinal beams (501) and the connecting sections (1a) are connected on both sides, and the battery pack installation space (Q) is formed between the front cross beam (404), the rear cross beam (504) and the connecting beams (1) on both sides.

9. The vehicle chassis structure according to any one of claims 1 to 8, characterized in that: In the left-right direction of the vehicle, the side of the connecting beam (1) on each side facing outward from the vehicle is connected to a side step mounting plate (6), the side step mounting plate (6) extends along the front-rear direction of the vehicle, and a side step mounting surface (6a) is provided on the top of the side step mounting plate (6).

10. A vehicle, characterized in that: The vehicle is provided with the vehicle chassis structure according to any one of claims 1 to 9.

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