Chassis structure and vehicle

Abstract

The invention provides a chassis structure and a vehicle. The chassis structure comprises a front auxiliary frame located on the front portion of the vehicle, a rear auxiliary frame located on the rear portion of the vehicle and a connecting beam connected between the front auxiliary frame and the rear auxiliary frame. The front auxiliary frame is arranged below a front cabin at the front part of the vehicle, a front cross beam is arranged at the rear part of the front auxiliary frame, the rear auxiliary frame is arranged below a rear floor at the rear part of the vehicle, and the rear auxiliary frame is provided with rear auxiliary frame longitudinal beams which are respectively arranged at the left side and the right side; the two connecting beams are arranged on the left side and the right side respectively, the front ends of the connecting beams on the two sides are connected with the left end and the right end of the front cross beam respectively, and the rear ends of the connecting beams on the two sides are connected with the front ends of the rear auxiliary frame longitudinal beams on the two sides respectively. The front cross beam, the rear auxiliary frame and the connecting beams on the two sides jointly define a battery pack installation space. Lightweight of a vehicle body is facilitated, meanwhile, the collision safety of the battery pack can be improved by means of the arrangement of the connecting beam, and the safety quality of the whole vehicle can be improved.

Description

Technical Field

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

[0002] In related technologies, the engine of traditional fuel vehicles is arranged in the front engine compartment of the vehicle body, while for new energy vehicles, such as pure electric vehicles, the battery pack is generally arranged under the passenger compartment. In order to provide sufficient battery life, not only is the weight of the vehicle body required to be reduced as much as possible, but also a larger layout space is required in the vehicle body so that a larger battery pack can be used.

[0003] At this time, on the one hand, when the battery pack specifications are large, the battery pack will be smaller in the Y direction (left and right direction of the vehicle) from the outside of the vehicle body. When the vehicle collides sideways, the battery pack is easily damaged due to force. In severe cases, the battery pack may even catch fire, threatening the personal safety of the driver and passengers, which is not conducive to improving the safety quality of the entire vehicle.

[0004] On the other hand, existing non-load-bearing vehicle bodies generally adopt an integral frame beam structure, which is heavy. When used in pure electric vehicles, it is not conducive to lightweighting the vehicle body and will affect the vehicle's endurance. At the same time, since the Y-direction (the left and right direction of the vehicle) spacing between the left and right beams in the non-load-bearing frame is small, it will affect the layout space of the battery pack, making it inconvenient to use a larger battery pack, which is not conducive to improving the vehicle's endurance. Summary of the invention

[0005] In view of this, the present invention aims to propose a chassis structure to improve the endurance of the entire vehicle and help improve the safety quality of the entire vehicle.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A chassis structure comprises a front subframe located at the front of a vehicle, a rear subframe located at the rear of the vehicle, and a connecting beam connected between the front subframe and the rear subframe;

[0008] The front subframe is arranged below the front cabin at the front of the vehicle, and a front cross beam is arranged at the rear of the front subframe, and the rear subframe is arranged below the rear floor at the rear of the vehicle, and the rear subframe has rear subframe longitudinal beams arranged at left and right sides;

[0009] The connecting beams are two connected on the left and right sides, and the front ends of the connecting beams on the two sides are connected to the left and right ends of the front cross beam respectively, and the rear ends of the connecting beams on the two sides are connected to the front ends of the rear sub-frame longitudinal beams on the two sides respectively;

[0010] The front cross beam, the rear subframe, and the connecting beams on both sides jointly define a battery pack installation space.

[0011] Furthermore, the front cross beam has a cross beam body, and both left and right ends of the cross beam body are connected with an extension section;

[0012] The outward extension section extends toward one side outside the vehicle along the left-right direction of the entire vehicle, and the front end of the connecting beam on each side is connected to the outward extension section on the same side.

[0013] Furthermore, the front sub-frame has front sub-frame longitudinal beams disposed on the left and right sides, and the rear ends of the front sub-frame longitudinal beams on both sides are connected to the cross beam body;

[0014] A front subframe front crossbeam and a front subframe middle crossbeam are connected between the front subframe longitudinal beams on both sides, and a front subframe anti-collision beam connected to the front subframe longitudinal beams on both sides is provided at the front end of the front subframe.

[0015] 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 subframe 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.

[0016] Furthermore, a rear cross beam is connected between the positions where the rear subframe longitudinal beams and the connecting beams on both sides are connected;

[0017] The battery pack installation space is formed between the rear cross beam, the front cross beam and the connecting beams on both sides.

[0018] Furthermore, a rear end of the rear sub-frame is provided with a rear sub-frame anti-collision beam connected to the rear sub-frame longitudinal beams on both sides.

[0019] Furthermore, 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.

[0020] Further, the connecting beams on both sides are integrally formed; and / or,

[0021] The lengths of the connecting beams on both sides along the front-rear direction of the vehicle are adjustable, and fixing structures are respectively provided on the connecting beams on both sides, and the fixing structures are used to fix the adjusted lengths of the connecting beams.

[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 chassis structure of the present invention can have the characteristics of a load-bearing body structure by adopting a front subframe and a rear subframe located at the front and rear parts of the vehicle, and can take advantage of the smaller weight of the load-bearing body to achieve lightweight body and improve the endurance of the whole vehicle. At the same time, by setting the connecting beams on both sides, the front and rear subframes are connected into one, and the front subframe, the rear subframe and the connecting beams on both sides jointly define the battery pack installation space, and the battery pack annular frame structure can also be formed by the connection setting of the connecting beams. In the event of a collision, the battery pack can move with the annular frame structure, which can reduce the collision impact on the battery pack, so as to increase the collision safety of the battery pack, thereby helping to improve the safety quality of the whole vehicle.

[0025] In addition, the front cross beam is provided with an extension section, which is conducive to the connection with the connecting beams on both sides. The front subframe longitudinal beams on the left and right sides of the front subframe are connected to the cross beam body, which is conducive to the Y-direction cross-sectional change of the front part of the load-bearing body, and meets the matching design requirements between the chassis and the body frame in the load-bearing body. The rear end of each side connecting beam is provided with an inclined connecting section, which is also conducive 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 also conducive to 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.

[0026] The setting of the rear cross beam can not only increase the structural strength and rigidity of the front part of the rear subframe, and provide an installation point for the rear end of the battery pack, but also the battery pack installation space is formed between the rear cross beam, the front cross beam 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.

[0027] Secondly, the rear subframe anti-collision beam is set at the rear end of the rear subframe. On the one hand, it can improve the rear subframe's rear collision force transmission performance, so that the collision force is better transmitted forward along the rear subframe longitudinal beam, avoiding single-position force, which makes it difficult to disperse the collision force and causes excessive deformation. On the other hand, the rear subframe anti-collision beam can also be used as a pedestrian anti-roll beam at the rear of the vehicle, which can improve safety during reversing. The rear subframe rear anti-collision beam is connected to the rear subframe longitudinal beam through the rear subframe energy absorption box, and the rear subframe energy absorption box can be used for crushing and energy absorption, which helps to further improve safety during rear collision.

[0028] In addition, the integral molding of the connecting beam can facilitate the preparation of the connecting beam and ensure the structural strength of the connecting beam itself. The length of the connecting beams on both sides is adjustable, and a fixed structure is provided for fixing the length of the connecting beam, which can help meet the wheelbase changes between different models, making the front and rear subframes a common part, which helps to achieve platform design and reduce the research and development costs of the whole vehicle. 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.

[0029] Another object of the present invention is to provide a vehicle, wherein the vehicle is provided with the chassis structure as described above.

[0030] The vehicle described in the present invention has the same beneficial effects as the above-mentioned chassis structure, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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:

[0032] Figure 1 A schematic diagram of a chassis structure according to an embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the front subframe according to an embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of the rear subframe according to an embodiment of the present invention;

[0035] Figure 4 is a schematic cross-sectional view of a connecting beam according to an embodiment of the present invention;

[0036] Figure 5 It is a structural schematic diagram of the rear cross beam according to an embodiment of the present invention;

[0037] Figure 6 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;

[0038] Figure 7 It is a schematic diagram of a chassis structure according to an embodiment of the present invention provided with a side step mounting plate;

[0039] Figure 8 for Figure 7 Schematic diagram of the structure of the middle part;

[0040] Fig. 9 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;

[0041] Fig.10 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;

[0042] Fig.11 A schematic diagram of a connecting beam length adjustment structure according to an embodiment of the present invention;

[0043] Description of reference numerals:

[0044] 1. Front subframe; 2. Rear subframe; 3. Connecting beam; 4. Side step mounting plate;

[0045] 101, front subframe longitudinal beam; 102, front subframe front crossbeam; 103, front subframe middle crossbeam; 104, front crossbeam; 104a, crossbeam body; 104b, overhanging section; 105, front subframe anti-collision beam; 106, front subframe energy absorption box; 201, rear subframe longitudinal beam; 202, rear subframe front crossbeam; 203, rear subframe rear crossbeam; 204, rear crossbeam; 2041, straight section; 2042, bending section; 205, rear subframe anti-collision beam; 206, rear subframe energy absorption box; 3a, connecting section; 3b, transverse reinforcement rib; 3c, longitudinal beam segment; 3d, fixed structure; 4a, side step mounting surface; 4b, collapse guide rib; 4c, vertical reinforcement rib;

[0046] A. Length adjustment position; B. Longitudinal beam connection position; Q. Battery pack installation space. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0051] Embodiment 1

[0052] The present embodiment relates to a chassis structure, which is applied to a new energy vehicle model with a battery pack, preferably a pure electric vehicle model, and the chassis structure is conducive to achieving lightweight vehicle body and helps to improve the collision safety of the battery pack.

[0053] 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.

[0054] 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.

[0055] 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 load forces. 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 there is no rigid frame, usually only the front, side, rear, and floor parts are strengthened, and the overall safety is relatively poor.

[0056] Based on the above introduction, 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 proposes a chassis structure developed based on the load-bearing body, and at this time, in terms of the overall structure, combined with Figure 1 As shown in , the chassis structure of the present embodiment includes a front subframe 1 , a rear subframe 2 , and a connecting beam 3 connected between the front subframe 1 and the rear subframe 2 .

[0057] Among them, the front subframe 1 is arranged under the front cabin at the front of the vehicle, and a front crossbeam 104 is arranged at the rear of the front subframe, the rear subframe 2 is arranged under the rear floor at the rear of the vehicle, and the rear subframe 2 has rear subframe longitudinal beams 201 arranged on the left and right sides. The above-mentioned connecting beams 3 are specifically two beams arranged on the left and right sides, and the front ends of the connecting beams 3 on both sides are respectively connected to the left and right ends of the front crossbeam 104, and the rear ends of the connecting beams 3 on both sides are respectively connected to the front ends of the rear subframe longitudinal beams 201 on both sides. At the same time, the above-mentioned front crossbeam 104, the rear subframe 2, and the connecting beams 3 on both sides also jointly define a battery pack installation space Q for installing a battery pack.

[0058] At this time, as the above structural design, by adopting a load-bearing body structure with front and rear subframes, this embodiment can take advantage of 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 3 on both sides, the front and rear subframes are connected into one, and the front subframe 1, the rear subframe 2 and the connecting beams 3 on both sides jointly define the battery pack installation space Q. With the connection setting of the connecting beams 3, this embodiment can also form a battery pack annular frame structure, so that the battery pack can move with the annular frame structure when the vehicle collides, thereby reducing the collision impact on the battery pack, so as to achieve the effect of increasing the collision safety of the battery pack.

[0059] In detail, as a preferred implementation form, the front cross beam 104 can be used as a part of the front sub-frame 1, and specifically as a front sub-frame rear cross beam located at the rear end of the front sub-frame 1. However, in addition to being the front sub-frame rear cross beam, the front cross beam 104 of this embodiment can also be connected between the front ends of the connecting beams 3 on both sides, and be independent of the beam structure provided on the front sub-frame 1. In this case, while the front cross beam 104 is integrated with the connecting beams 3 on both sides to form an integrated frame structure, it is also connected to the front sub-frame 1 to achieve the connection between the connecting beams 3 on both sides and the front sub-frame 1.

[0060] Taking the front cross beam 104 as the rear cross beam of the front subframe as an example, in the specific implementation, the front subframe 1 of this embodiment can refer to the front subframe structure of the existing load-bearing body, and generally speaking, it is still the same as Figure 2 As shown in the figure, the front sub-frame 1 has front sub-frame longitudinal beams 101 arranged on the left and right sides, a front sub-frame front cross beam 102 and a front sub-frame middle cross beam 103 are connected between the front sub-frame longitudinal beams 101 on both sides, and the rear ends of the front sub-frame longitudinal beams 101 on both sides are connected to a front cross beam 104 which is a front sub-frame rear cross beam.

[0061] At this point, it should be pointed out that when the front cross beam 104 is independently provided from the front sub-frame 1, the connection between the front cross beam 104 and the front sub-frame 1 is generally connected to the rear ends of the front sub-frame longitudinal beams 101 on both sides. Moreover, when the front cross beam 104 is independently provided from the front sub-frame 1, the front sub-frame rear cross beam in the front sub-frame 1 can be selectively provided according to the needs.

[0062] In this embodiment, continue as Figure 2 As shown, a front subframe anti-collision beam 105 connected to the front subframe longitudinal beams 101 on both sides is also provided at the front end of the front subframe 1, and the front subframe anti-collision beam 105 is specifically connected to the front ends of the front subframe longitudinal beams 101 on each side through a front subframe energy absorption box 106.

[0063] In addition, as a preferred implementation form, in the front subframe 1 of this embodiment, the front cross beam 104 also structurally comprises a cross beam body 104a located in the middle, and overhanging sections 104b respectively connected to the left and right ends of the cross beam body 104a.

[0064] The rear end of each side front subframe longitudinal beam 101 is connected to the cross beam body 104a, and each end extension section 104b extends toward the outside of the vehicle along the left-right direction of the vehicle, and the front end of each side connecting beam 3 is also specifically connected to the extension section 104b on the same side.

[0065] It is understandable that, by providing the extension section 104a in the front cross beam 104, it is possible to facilitate the connection with the connecting beams 3 on both sides. Figure 1 , and then by connecting the front sub-frame longitudinal beams 101 on the left and right sides of the front sub-frame 1 with the cross beam body 104a in the front cross beam 104, 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 3 on each side and the front sub-frame longitudinal beams 101 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 1.

[0066] 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.

[0067] In this embodiment, still combined with Figure 1 and Figure 3 As shown in the figure, as a preferred embodiment, the rear end of each side connecting beam 3 is provided with an inclined connecting section 3a, and each side connecting section 3a is connected to the front end of the rear sub-frame longitudinal beam 201 on the same side through the connecting section 3a, and the distance between the connecting sections 3a on both sides is gradually reduced from front to rear in the front-to-rear direction of the whole vehicle.

[0068] At this time, by setting an inclined connecting section 3a at the rear end of each side connecting beam 3, it can also facilitate the connection between the connecting beam 3 and the rear subframe longitudinal beam 201, and make the distance between the connecting sections 3a on both sides gradually decrease from front to rear. Similar to the design of the above-mentioned overhanging section 104b, 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.

[0069] In this embodiment, it is worth noting that, in a specific implementation, the connecting beams 3 on both sides may be, for example, an integrally formed beam structure, and specifically an integral closed structure, and its cross section may be as follows: Figure 4 As shown in . Moreover, at this time, the connecting beam 3 can also be integrally formed with the front cross beam 104 and the rear subframe longitudinal beam 201 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 3 itself by virtue of the high strength of the cavity structure, and by integrally forming the connecting beam 3 with the front and rear subframes, the front subframe 1, the connecting beam 3 and the rear subframe 2 after being connected as one can have better structural strength and rigidity.

[0070] Of course, in addition to being an integrated structure, the connecting beam 3 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 104 and the rear subframe longitudinal beam 201, in specific implementation, it is also possible to set the connecting beam 3 in a detachable manner. In this case, the above-mentioned detachable manner can generally adopt a screw connection structure, and combined with Figure 8 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.

[0071] Of course, in order to ensure the reliability of the force transmission of the connecting beam 3, 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. Figure 8 At the positions indicated by the reference numerals B, the connection beams 3 on each side can be arranged by means of a flat plate docking method and a screw connection structure connected along the X direction.

[0072] In this embodiment, continue to refer to Figure 1 as well as Figure 3As shown, in the specific implementation, the rear subframe 2 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 202 and a rear subframe rear cross beam 203 are connected between the rear subframe longitudinal beams 201 on both sides, and further, a rear cross beam 204 is also connected between the positions where the rear subframe longitudinal beams 201 on both sides are connected to the connecting beams 3, that is, between the connecting positions of the rear subframe longitudinal beams 201 on both sides and the connecting sections 3a.

[0073] At this time, the battery pack installation space Q is formed between the rear cross beam 204, the front cross beam 104 and the connecting beams 3 on both sides. Moreover, it can be understood that, by setting the rear cross beam 204, not only the structural strength and rigidity of the front part of the rear sub-frame 2 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 installation space Q between the rear cross beam 204, the front cross beam 104 and the connecting beams 3 on both sides, this embodiment is also conducive to making the formed annular frame structure a rigid enveloping structure adapted to the shape of the battery pack, thereby better improving the collision safety of the battery pack.

[0074] In addition, the rear cross beam 204 is arranged between the connection positions of the connecting sections 3a on both sides and the rear sub-frame longitudinal beam 201. By connecting the ends of the rear cross beam 204 to the connection positions between the connecting sections 3a on each side and the rear sub-frame longitudinal beam 201, it is not only helpful to ensure the connection strength of the rear cross beam 204, but also conducive to better improving the dynamic stiffness of the front position of the rear sub-frame 3.

[0075] In specific implementation, the rear cross beam 204 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 204 and to facilitate the installation of the rear end of the battery pack, the rear cross beam 204 is provided with a plurality of rear cross beams 204, each of which is provided with a plurality of rear cross beams 204. Figure 5 As shown, the rear cross beam 204 of this embodiment can be designed to be arched downward along the vertical direction of the vehicle, and have a straight section 2041 in the middle and bent sections 2042 on the left and right sides. The bent sections 2042 on both sides are inclined upward and are respectively connected to the rear subframe longitudinal beam 201 on the same side.

[0076] Still by Figure 1 and Figure 3As 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 205 connected to the rear sub-frame longitudinal beams 201 on both sides at the rear end of the rear sub-frame 2. In this way, it can be understood that by providing the rear sub-frame anti-collision beam 205 at the rear end of the rear sub-frame 2, on the one hand, it can improve the rear collision force transmission performance of the rear sub-frame 2, and can make the collision force better dispersed to the rear sub-frame longitudinal beams 201 on both sides through the rear sub-frame anti-collision beam 205, so as to be transmitted forward along the rear sub-frame longitudinal beam 201, avoiding single-position force, and the collision force is difficult to disperse, resulting in excessive deformation. On the other hand, by providing the above-mentioned rear sub-frame anti-collision beam 205, the rear sub-frame anti-collision beam 205 can also be used as a pedestrian anti-rolling beam at the rear of the vehicle, thereby improving the safety during the reversing process.

[0077] It should be noted that in the specific implementation, Figure 6 As shown, the structure of the rear subframe anti-collision beam 205 can refer to the front subframe anti-collision beam 105 in the front subframe 1, 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 205, preferably, the rear ends of the rear subframe longitudinal beams 201 on both sides can also be connected to the rear subframe energy absorption box 206, and the rear subframe anti-collision beam 205 is specifically connected to the rear subframe energy absorption box 206 on both sides.

[0078] At this time, the rear subframe energy absorption box 206 is the same as the front subframe energy absorption box 106 in the front subframe 1, 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 205 with the rear subframe longitudinal beam 201 through the rear subframe energy absorption box 206, it can be crushed and energy absorbed through the rear subframe energy absorption box 206, so as to further improve the rear collision safety of the vehicle.

[0079] In addition, it should be noted that, through the provision of the above-mentioned rear subframe anti-collision beam 205, it can not only cooperate with the front subframe anti-collision beam 105 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 105 and the rear subframe anti-collision beam 205 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 vehicle body frame, thereby providing super strong double protection.

[0080] like Figure 7 and Figure 8 As 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 3 facing outward from the vehicle can be further connected to a side step mounting plate 4. The side step mounting plate 4 on each side extends along the front-rear direction of the vehicle, and a side step mounting surface 4a is provided on the top of each side step mounting plate 4.

[0081] At this time, by installing the side step panel and the side step decoration on the side step installation surface 4a, 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 4 to the outside of the connecting beam 3, 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.

[0082] In the specific implementation, it should be noted that the side step mounting plates 4 on each side can be detachably connected to the connecting beam 3 on the same side through a connecting piece, for example. In this way, the side step mounting plates 4 on each side can be detachably connected to the connecting beam 3 on the same side through the connecting piece, which can facilitate the assembly of the side step mounting plates 4 and also facilitate the maintenance and replacement of the side step mounting plates 4 in the later stage.

[0083] Of course, in addition to the above detachable setting, in specific implementation, this embodiment can also make the side step mounting plate 4 on each side integrally formed with the connecting beam 3 on the same side. In this way, the side step mounting plate 4 and the connecting beam 3 are integrally formed, which can reduce the preparation cost of the connecting beam 3 and the side step mounting plate 4, and can also better ensure the structural strength of the connecting beam 3 and the side step mounting plate 4, so as to help improve the overall rigidity of the chassis structure.

[0084] As for the detachable side step mounting plate 4, specifically, it can be, for example, a steel profile or an aluminum alloy profile, and the connecting piece can generally adopt a screw connection structure to fix the side step mounting plate 4 to the connecting beam 3. As for the side step mounting plate 4 and the connecting beam 3 being integrally formed, for example, the side step mounting plate 4 and the connecting beam 3 can both be made of a steel profile or an aluminum alloy profile, or the side step mounting plate 4 and the connecting beam 3 can also be made of a steel roll-pressed structure.

[0085] like Fig. 9 As shown in FIG. 1 , it is an exemplary structure when both the side step mounting plate 4 and the connecting beam 3 are made of aluminum alloy profiles. In this structural form, in order to increase the structural strength of the connecting beam 3 and the side step mounting plate 4, transverse reinforcing ribs 3b and vertical reinforcing ribs 4c 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 4 when the vehicle is hit from the side, a bending-shaped extending collapse guide rib 4b can also be provided at the bottom of the side step mounting plate 4.

[0086] At this time, vertical reinforcing ribs 4c and crush guiding ribs 4b are adopted for the reinforcing ribs at the side step mounting plate 4. While appropriately increasing the structural strength at the position of the side step mounting plate 4, it also enables the side step mounting plate 4 to have good crush energy absorption capacity, so that one side of the side step mounting plate 4 becomes 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 4, on one side of the connecting beam 3, through the arrangement of the transverse reinforcing rib 3b, by utilizing the transverse supporting effect of the transverse reinforcing rib 3b, the connecting beam 3 can have strong supporting stiffness when the vehicle has a side impact. Furthermore, it can make one side of the connecting beam 3 become a rigid frame area to better protect the battery pack located in the battery pack installation space Q.

[0087] In this embodiment, in addition to as Fig. 9 shown, the integrally formed connecting beam 3 and side step mounting plate 4 have different cross-sectional structures. Of course, in specific implementation, the wall thickness on one side of the connecting beam 3 can also be made greater than that on one side of the side step mounting plate 4. In this way, the strength on one side of the connecting beam 3 can be further increased to make full use of the crush energy absorption of one side of the side step mounting plate 4 to protect the battery pack inside the connecting beam 3.

[0088] Such as Fig.10 shown is an exemplary cross-sectional form when the above-mentioned side step mounting plate 4 and connecting beam 3 adopt a steel rolling structure. It should be noted that when adopting the rolling structure, the integrally formed side step mounting plate 4 and connecting beam 3 generally adopt the Fig.10 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 4 and connecting beam 3 adopt other cross-sectional forms.

[0089] In this embodiment, based on the arrangement of the two connecting beams 3, in addition to making the two connecting beams 3 an integral structure, as a preferred implementation form, it can also be set such that the lengths of the two connecting beams 3 along the front - rear direction of the whole vehicle are adjustable, and fixing structures 3d are respectively arranged on the two connecting beams 3 to fix the adjusted lengths of the connecting beams 3 through the fixing structures 3d. At this time, by making the lengths of the two connecting beams 3 adjustable and setting the fixing structures for fixing the lengths of the connecting beams, it can facilitate meeting the wheelbase changes between different vehicle models, and make the front and rear subframes common parts, thereby contributing to achieving platform design to reduce the overall vehicle R & D cost.

[0090] During specific implementation, the length adjustment positions of the two connecting beams 3 can be as indicated by the label A in Figure 1 , and, as Fig.11As shown in , in order to achieve the adjustable length of the connecting beam 3, for example, the two longitudinal beam segments 3c disconnected at the position marked A can be connected by plugging, and at the same time, the above-mentioned fixing structure 3d can be fixed in the form of a threaded sleeve and a bolt.

[0091] The threaded sleeve can be fixed in one of the longitudinal beam segments 3c, and connecting holes are respectively provided on the two longitudinal beam segments 3c, and the connecting holes on the outer longitudinal beam segment 3c are arranged in a plurality of intervals. When adjusting the length of the connecting beam 3, after the insertion length of the two longitudinal beam segments 3c is adjusted, the bolt is screwed into the threaded sleeve through the connection process, so that the length of the connecting beam 3 can be adjusted and the adjusted length of the connecting beam 3 can be fixed.

[0092] In addition, it should be noted that when the length of the connecting beams 3 on both sides is adjustable, the side step mounting plate 4 disposed on the side of each side connecting beam 3 facing the outside of the vehicle should be detachably connected to the connecting beam 3. In specific implementation, the side step mounting plate 4 of a suitable length can be manufactured according to the adjusted length of the connecting beam 3, and then connected to the outside of the connecting beam 3 after the length of the connecting beam 3 is fixed.

[0093] The chassis structure of this embodiment adopts the above structure. On the basis of a traditional load-bearing body, the front and rear subframes are connected by connecting beams 3 on both sides. By adopting a load-bearing body structure with front and rear subframes, the load-bearing body has a smaller weight, which is beneficial to achieving lightweight body and improving the endurance of the whole vehicle.

[0094] At the same time, by setting the connecting beams 3 on both sides, the front and rear subframes are connected, and the front cross beam 104, the rear subframe 2 and the connecting beams 3 on both sides jointly define the battery pack installation space Q. The chassis structure of this embodiment can also form a battery pack ring frame structure with the help of the connection setting of the connecting beams 3. In the event of a collision, the battery pack can move with the ring frame structure, which can reduce the collision impact on the battery pack, increase the collision safety of the battery pack, and improve the safety quality of the entire vehicle.

[0095] In addition, 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 cross-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, the chassis structure of this embodiment becomes a structural innovation in the form of a sub-frame, and is 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 3, which is not an integrated beam structure in the non-load-bearing body.

[0096] Of course, it is precisely because of the integrated structure of the front and rear subframes connected by the connecting beam 3 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. Therefore, the chassis structure of this embodiment not only improves the shortcomings of the load-bearing body structure, but also has the advantages of the non-load-bearing body structure, which can well improve the overall quality of the vehicle and has good practicality.

[0097] Embodiment 2

[0098] 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 chassis structure of the first embodiment is provided in the vehicle.

[0099] It should be noted that, based on the chassis structure of 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 3 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.

[0100] The vehicle of this embodiment is provided with the 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 3 on both sides. This is not only conducive to achieving lightweight of the body and improving the endurance of the whole vehicle, but also can reduce the collision impact on the battery pack, increase the collision safety of the battery pack, help to improve the safety quality of the whole vehicle, and has good practicality.

[0101] 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 chassis structure, characterized in that: The vehicle comprises a front subframe (1) located at the front of the vehicle, a rear subframe (2) located at the rear of the vehicle, and a connecting beam (3) connected between the front subframe (1) and the rear subframe (2); The front subframe (1) is arranged below the front cabin at the front of the vehicle, and a front crossbeam (104) is arranged at the rear of the front subframe (1); the rear subframe (2) is arranged below the rear floor at the rear of the vehicle, and the rear subframe (2) has rear subframe longitudinal beams (201) arranged on left and right sides; The connecting beams (3) are two connected on the left and right sides, and the front ends of the connecting beams (3) on the two sides are respectively connected to the left and right ends of the front cross beam (104), and the rear ends of the connecting beams (3) on the two sides are respectively connected to the front ends of the rear sub-frame longitudinal beams (201) on the two sides; The front cross beam (104), the rear subframe (2), and the connecting beams (3) on both sides jointly define a battery pack installation space (Q).

2. The chassis structure according to claim 1, characterized in that: The front cross beam (104) has a cross beam body (104a), and both left and right ends of the cross beam body (104a) are connected to an extension section (104b); The outward extension section (104b) extends toward one side outside the vehicle along the left-right direction of the entire vehicle, and the front end of the connecting beam (3) on each side is connected to the outward extension section (104b) on the same side.

3. The chassis structure according to claim 2, characterized in that: The front sub-frame (1) has 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 both sides are connected to the cross beam body (104a); A front sub-frame front cross beam (102) and a front sub-frame middle cross beam (103) are connected between the front sub-frame longitudinal beams (101) on both sides, and a front sub-frame anti-collision beam (105) connected to the front sub-frame longitudinal beams (101) on both sides is provided at the front end of the front sub-frame (1).

4. The chassis structure according to claim 1, characterized in that: The rear end of the connecting beam (3) on each side is provided with an inclined connecting section (3a), and the connecting beam (3) on each side is connected to the front end of the rear sub-frame longitudinal beam (201) on the same side through the connecting section (3a), and the distance between the connecting sections (3a) on both sides is gradually reduced from front to rear in the front-to-rear direction of the vehicle.

5. The chassis structure according to claim 1, characterized in that: A rear cross beam (204) is connected between the positions where the rear sub-frame longitudinal beams (201) and the connecting beams (3) are connected on both sides; The battery pack installation space (Q) is formed between the rear cross beam (204), the front cross beam (104) and the connecting beams (3) on both sides.

6. The chassis structure according to claim 1, characterized in that: A rear sub-frame anti-collision beam (205) connected to the rear sub-frame longitudinal beams (201) on both sides is provided at the rear end of the rear sub-frame (2).

7. The chassis structure according to claim 6, characterized in that: The rear ends of the rear sub-frame longitudinal beams (201) on both sides are connected to rear sub-frame energy absorption boxes (206), and the rear sub-frame anti-collision beams (205) are connected to the rear sub-frame energy absorption boxes (206) on both sides.

8. The chassis structure according to claim 1, characterized in that: The connecting beams (3) on both sides are integrally formed; and / or, The lengths of the connecting beams (3) on both sides along the front-rear direction of the vehicle are adjustable, and the connecting beams (3) on both sides are respectively provided with fixing structures (3d), and the fixing structures (3d) are used to fix the adjusted length of the connecting beams (3).

9. The 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 (3) on each side facing outward from the vehicle is connected to a side step mounting plate (4), the side step mounting plate (4) extends in the front-rear direction of the vehicle, and a side step mounting surface (4a) is provided on the top of the side step mounting plate (4).

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

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