Lower vehicle body and vehicle

Abstract

The utility model relates to the technical field of vehicles, in particular to a lower vehicle body and a vehicle. The lower vehicle body comprises a longitudinal beam, and the longitudinal beam comprises a front girder, a girder arm, a middle girder and a rear girder which are sequentially connected. Wherein the girder arm is obliquely arranged in the length direction of the vehicle, and the extending direction of the middle girder and the extending direction of the rear girder are both parallel to the length direction of the vehicle, so that the lower vehicle body at least can meet three piece distribution states. The large beam arms are additionally arranged to be in transition connection with the front large beam and the middle large beams, the positions of the middle large beams arranged on the lower vehicle body are adjusted, the space between the middle large beams on the two sides is enlarged, the arrangement space of the lower vehicle body is increased, and enough space is reserved for installing parts corresponding to different types of vehicles; therefore, the lower vehicle body can be compatible with three types of vehicles (fuel, plug-in hybrid vehicles and pure electric vehicles), and the adaptability of the lower vehicle body is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a lower vehicle body and a vehicle. Background Art

[0002] The existing front frame of a fuel-powered vehicle is arranged in an outward-facing "X" (toe-to-toe) pattern, with the middle and rear frames being incompatible and inconsistently spaced. Consequently, the frame of a fuel-powered vehicle is not compatible with fuel-powered, PHEV (plug-in hybrid electric vehicle), and EV (electric vehicle) vehicles, resulting in poor compatibility. Utility Model Content

[0003] The embodiments of the present application provide a lower body and a vehicle, aiming to standardize the design of the front body to be compatible with fuel, PHEV and EV models.

[0004] An embodiment of the present application provides a lower body for a vehicle, wherein the lower body includes a longitudinal beam, and the longitudinal beam includes a front beam, a beam arm, a middle beam, and a rear beam connected in sequence;

[0005] Among them, the beam arm is arranged obliquely along the length direction of the vehicle, and the extension direction of the middle beam and the extension direction of the rear beam are parallel to the length direction of the vehicle, so that the lower body can meet at least three layout states.

[0006] In a possible design, along the length direction of the vehicle, a ratio L of the length of the beam arm to the length of the longitudinal beam is 0.13≤L≤0.17.

[0007] In a possible design, the beam arm is a three-way structure, and the beam arm is also used to connect with the door sill.

[0008] In a possible design, the middle beam and the rear beam have the same structure.

[0009] In a possible design, along the width direction of the vehicle, the longitudinal beam is a symmetrical member installed on both sides of the lower body;

[0010] Along the width direction of the vehicle, the area between the front beams on both sides is the first layout area, the area between the beam arms on both sides is the second layout area, the area between the middle beams on both sides is the third layout area, and the area between the rear beams on both sides is the fourth layout area;

[0011] In the first layout state, the first layout area and the second layout area are used to arrange the engine and the transmission, and the third layout area and the fourth layout area are used to arrange the transmission shaft and the oil tank.

[0012] In a possible design, along the width direction of the vehicle, the longitudinal beam is a symmetrical member installed on both sides of the lower body;

[0013] Along the width direction of the vehicle, the area between the front beams on both sides is the first layout area, the area between the beam arms on both sides is the second layout area, the area between the middle beams on both sides is the third layout area, and the area between the rear beams on both sides is the fourth layout area;

[0014] In the second layout state, the first layout area and the second layout area are used to arrange the engine and the motor, the third layout area is used to arrange the battery, and the fourth layout area is used to arrange the fuel tank.

[0015] In a possible design, along the width direction of the vehicle, the longitudinal beam is a symmetrical member installed on both sides of the lower body;

[0016] Along the width direction of the vehicle, the area between the middle beams on both sides is the third arrangement area, and the area between the rear beams on both sides is the fourth arrangement area;

[0017] In the third arrangement state, the third arrangement area and the fourth arrangement area are used for arranging batteries.

[0018] In a possible design, the lower body further includes a floor and a crossbeam, wherein the crossbeam is connected to the floor and is disposed below the front panel;

[0019] In the first and second fabric states, a portion of the crossbeam is recessed toward the floor to avoid the engine;

[0020] In the third arrangement state, the crossbeam is in a straight rod structure.

[0021] In one possible design, the lower vehicle body further includes a floor;

[0022] In the first fabric state, the lower body further includes a transmission mounting frame and a drive shaft mounting frame, and the transmission mounting frame and the drive shaft mounting frame are connected to the floor.

[0023] The embodiment of the present application further provides a vehicle, the vehicle comprising the lower vehicle body described above;

[0024] The vehicle is a fuel vehicle; or, the vehicle is a pure electric vehicle; or, the vehicle is a plug-in hybrid vehicle.

[0025] In this application, a beam arm is added to transition between the front and middle beams, and the position of the middle beam on the lower body is adjusted to expand the space between the two middle beams. Furthermore, the spacing between the two middle beams is kept consistent, and the spacing between the two middle beams is the same as the spacing between the two rear beams. This increases the layout space of the lower body and reserves sufficient space to install components corresponding to different types of vehicles, making the lower body compatible with three types of vehicles (fuel-powered vehicles, plug-in hybrid vehicles, and pure electric vehicles), improving the adaptability of the lower body.

[0026] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of the lower body;

[0028] Figure 2 This is a schematic diagram of the lower vehicle body provided in this application in one embodiment;

[0029] Figure 3 This is a schematic diagram of the lower body used for a fuel vehicle;

[0030] Figure 4 A schematic diagram of the lower body when used for a plug-in hybrid vehicle;

[0031] Figure 5 This is a schematic diagram of the lower body when used for a pure electric vehicle;

[0032] Figure 6 This is a schematic diagram of the front panel of a fuel vehicle;

[0033] Figure 7 A schematic diagram of the floor in a fuel vehicle or a plug-in hybrid vehicle;

[0034] Figure 8 For installation Figure 7 beams in the middle floor;

[0035] Figure 9 Schematic diagram of the floor in a pure electric vehicle;

[0036] Figure 10 for Figure 9 beams in the middle floor;

[0037] Figure 11 This is a schematic diagram of the floor of a fuel vehicle;

[0038] Figure 12 This is a schematic diagram of the transmission mounting bracket;

[0039] Figure 13 Schematic diagram of the drive shaft mounting bracket.

[0040] Reference numerals:

[0041] 1- Lower body;

[0042] 11-front beam;

[0043] 111-first arrangement area;

[0044] 12- beam arm;

[0045] 121-second layout area;

[0046] 13-middle beam;

[0047] 131-third layout area;

[0048] 14-rear beam;

[0049] 141-Fourth layout area;

[0050] 15- Floor;

[0051] 16- crossbeam;

[0052] 161- first paragraph;

[0053] 162-Second paragraph;

[0054] 163- third paragraph;

[0055] 17-Transmission mounting bracket;

[0056] 18-drive shaft mounting bracket;

[0057] 181-Mounting plate;

[0058] 182-Reinforcement plate;

[0059] 19-front panel;

[0060] 191-clutch reinforcement plate;

[0061] 192-brake reinforcement plate;

[0062] 2-Engine;

[0063] 3- Transmission;

[0064] 4- transmission shaft;

[0065] 5-Fuel tank;

[0066] 6-motor;

[0067] 7-Battery;

[0068] 8-Chassis.

[0069] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0070] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0071] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0072] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0073] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0074] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0075] like Figure 1 The figure shows the structure of the lower body 1 of the vehicle. The lower body 1 includes symmetrically arranged longitudinal beams, which are connected in sequence to form a front beam 11, a middle beam 13, and a rear beam 14. The middle beams 13 on both sides are arranged in a nearly outward-facing "X" shape, resulting in inconsistent spacing between the middle beams 13 and the spacing between the rear beams 14. This makes it impossible to accommodate components such as the battery 7 and the fuel tank 5 in the area between the middle beams 13, resulting in poor adaptability.

[0076] To this end, this embodiment provides a vehicle to solve the above technical problems.

[0077] like Figure 2The schematic diagram of the structure of the lower body of the vehicle shown in one embodiment, the vehicle includes a lower body 1, the lower body 1 includes longitudinal beams symmetrically arranged along the width direction X of the vehicle, and the longitudinal beams include a front beam 11, a beam arm 12, a middle beam 13 and a rear beam 14 connected in sequence along the length direction Y of the vehicle (the dotted lines in the figure indicate the connection positions of the beams). Among them, the beam arm 12 is tilted along the length direction Y of the vehicle. That is, the beam arm 12 is approximately in an outward-facing "X" structure. The extension direction of the middle beam 13 and the extension direction of the rear beam 14 are both parallel to the length direction Y of the vehicle. That is, along the width direction X of the vehicle, the spacing between the middle beams 13 on both sides is consistent, the spacing between the rear beams 14 on both sides is consistent, and the spacing between the middle beams 13 on both sides is the same as the spacing between the rear beams 14 on both sides, so that the lower body 1 satisfies at least three layout states.

[0078] In this embodiment, a beam arm 12 is added to transitionally connect the front beam 11 and the middle beam 13. The position of the middle beam 13 on the lower body 1 is adjusted, and the space between the two middle beams 13 is increased. Furthermore, the spacing between the two middle beams 13 is kept consistent, and the spacing between the two middle beams 13 is the same as the spacing between the two rear beams 14. This increases the layout space of the lower body 1 and reserves sufficient space to install components corresponding to different types of vehicles. This makes the lower body 1 compatible with three types of vehicles (fuel-powered vehicles, plug-in hybrid vehicles, and pure electric vehicles), improving the adaptability of the lower body 1.

[0079] Specifically, the lower body 1 of this embodiment has a first fabric state, a second fabric state and a third fabric state. The lower body can be arranged in one of the fabric states according to actual conditions, and the corresponding components can be assembled to the lower body.

[0080] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the lower body in the first layout state. In some embodiments, along the vehicle width direction X, the area between the two front beams 11 is a first layout area 111, the area between the two beam arms 12 is a second layout area 121, the area between the two center beams 13 is a third layout area 131, and the area between the two rear beams 14 is a fourth layout area 141. In the first layout state, the first layout area 111 and the second layout area 121 are used to accommodate the engine 2 and the transmission 3, while the third layout area 131 and the fourth layout area 141 are used to accommodate the drive shaft 4 and the fuel tank 5.

[0081] That is to say, in this embodiment, the lower body 1 can be used as the lower body of a fuel vehicle, and the layout area between the longitudinal beams on both sides can be used to install the power components of the fuel vehicle.

[0082] In addition, the lower body 1 can reserve space for the installation of components such as the chassis 8, exhaust, spare tire, leaf spring, coil spring, etc. in a fuel vehicle. The specific installation positions of the chassis 8, exhaust, spare tire, leaf spring, coil spring, etc. can be set according to actual conditions, and this embodiment does not limit this.

[0083] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the lower body in the second layout state. In some embodiments, along the vehicle width direction X, the area between the two front beams 11 is a first layout area 111, the area between the two beam arms 12 is a second layout area 121, the area between the two center beams 13 is a third layout area 13, and the area between the two rear beams 14 is a fourth layout area 141. In the second layout state, the first layout area 111 and the second layout area 121 are used to accommodate the engine 2 and the motor 6, the third layout area 131 is used to accommodate the battery 7, and the fourth layout area 141 is used to accommodate the fuel tank 5.

[0084] That is to say, the lower body 1 in this embodiment can also serve as the lower body of a plug-in hybrid vehicle, and the layout area between the longitudinal beams on both sides can be used to install power components of the plug-in hybrid vehicle.

[0085] In addition, the lower body 1 can reserve space for the installation of components such as the chassis 8, exhaust, spare tire, leaf springs, and coil springs in the plug-in hybrid vehicle. The specific installation positions of the chassis 8, exhaust, spare tire, leaf springs, and coil springs can be set according to actual conditions, and this embodiment does not limit them here.

[0086] Please refer to Figure 5 , Figure 5 Figure 1 is a schematic diagram of the lower body in the third layout state. In some embodiments, along the vehicle width direction X, the area between the center beams 13 on both sides is the third layout area 131, and the area between the rear beams 14 on both sides is the fourth layout area 141. In the third layout state, the third layout area 131 and the fourth layout area 141 are used to accommodate the battery 7.

[0087] That is to say, in this embodiment, the lower body 1 can also be used as the lower body of a pure electric vehicle, and the layout area between the longitudinal beams on both sides can be used to install the power components of the pure electric vehicle.

[0088] In addition, the lower body 1 can reserve space for the installation of components such as the chassis 8, spare tire, leaf spring, coil spring, etc. in the pure electric vehicle. The specific installation positions of the chassis 8, spare tire, leaf spring, coil spring, etc. can be set according to actual conditions, and this embodiment does not limit them here.

[0089] In conjunction with the above embodiments, by modifying the longitudinal beam structure, the lower body 1 is compatible with different types of vehicles, enabling lower body sharing and reducing vehicle manufacturing costs. Furthermore, the longitudinal beam is a standard component, designed and developed to the same specifications for all vehicle models. Compared to different longitudinal beam structures in the lower body 1 of each vehicle model, some transition brackets are eliminated, saving installation space and costs.

[0090] Furthermore, along the longitudinal direction of the vehicle, a ratio L of the length of the beam arm 12 to the length of the longitudinal beam is 0.13≤L≤0.17.

[0091] For example, the ratio L of the length of the beam arm 12 to the length of the longitudinal beam may be 0.13, 0.14, 0.15, 0.16, or 0.17. For example, the length of the beam arm 12 may be 737 mm, and the length of the longitudinal beam may be 4800 mm.

[0092] In this embodiment, if the ratio L of the length of the beam arm 12 to the length of the longitudinal beam is too large (such as L>0.17), the length of the beam arm 12 is longer and may occupy the position of the middle beam 13 and the rear beam 14. Since the beam arm 12 is tilted, the layout area between the longitudinal beams on both sides is reduced, thereby affecting the layout of the battery 7.

[0093] If the ratio L of the length of the beam arm 12 to the length of the longitudinal beam is too small (eg, L<0.17), the structural strength of the beam arm 12 is poor, which affects the connection strength between the front beam 11 and the middle beam 13 .

[0094] Therefore, when the ratio L of the length of the beam arm 12 to the length of the longitudinal beam is set to 0.13≤L≤0.17, the lower body 1 is compatible with three types of vehicles while ensuring the rigidity of the lower body 1.

[0095] In some embodiments, the beam arm 12 is a three-way structure, and the beam arm 12 is connected to the front beam 11, the middle beam 13, and the door sill respectively. In this application, the beam arm 12 is directly connected to the door sill, which saves the transition beam structure between the longitudinal beam and the door sill compared to the existing longitudinal beam structure, thus saving costs.

[0096] In some embodiments, the structure of the middle beam 13 and the rear beam 14 is the same, so that the middle beam 13 and the rear beam 14 can be shared, which simplifies the structure and saves manufacturing costs.

[0097] When the lower vehicle body 1 is applied to different types of vehicles, the vehicles do not need to be significantly adjusted, and corresponding parts can be arranged according to needs.

[0098] like Figure 6The diagram shows the structure of a dash panel 19 in a fuel-powered vehicle, which includes a clutch reinforcement plate 191 and a brake reinforcement plate 192, which are designed separately. The clutch reinforcement plate 191 and the brake reinforcement plate 192 are connected and installed on the dash panel 19. However, when the dash panel 19 is used in plug-in hybrid vehicles and pure electric vehicles, only the brake reinforcement plate 192 can be installed on the dash panel.

[0099] In this embodiment, some panels are designed as split structures, which makes it easy to select the required panels for installation according to the vehicle model.

[0100] In some embodiments, the lower body 1 also includes a floor 15 and a crossbeam 16. The crossbeam 16 is connected to the floor 15 and the two side beam arms 12. The crossbeam 16 is arranged below the front panel 19. The crossbeam 16 is connected to the floor 15 and the two side beam arms 12 to obtain better anti-collision performance.

[0101] like Figure 7 Shown are schematic diagrams of the floors of a fuel vehicle and a plug-in hybrid vehicle. Part of the structure of the floor 15 is recessed toward the vehicle body (as viewed from the bottom surface of the floor 15 ) to leave a mounting channel. Figure 8 Shown is installed in Figure 7 The cross beam 16 on the middle floor has a portion of its structure recessed toward the floor 15 , and the cross beam 16 matches the structural shape of the floor 15 to flow out of the installation space.

[0102] Please continue to refer to Figure 8 The crossbeam 16 includes a first section 161, a second section 162 and a third section 163 that are connected to each other. The second section 162 is located between the first section 161 and the third section 163. Part of the structure of the second section 162 is recessed toward the floor 15 relative to the first section 161 and the third section 163 to avoid components such as the engine 2 and the transmission 3.

[0103] To facilitate the formation of the structure of the second section 162 , the second section 162 may be composed of three welded parts, such as two symmetrical L-shaped sections and a straight section, wherein the two symmetrical L-shaped sections are connected on both sides of the straight section.

[0104] like Figure 9 The figure shows a schematic diagram of the floor of a pure electric vehicle. The floor 15 does not involve the arrangement of components such as the engine and transmission. Figure 10 Shown is installed in Figure 9 The cross beam of the midsole plate, the cross beam 16 can be set as a straight rod structure.

[0105] Please continue to refer to Figure 10 The crossbeam 16 includes a first section 161 , a second section 162 and a third section 163 , which are connected to each other. The second section 162 is located between the first section 161 and the third section 163 .

[0106] In this embodiment, the floor can be installed according to the vehicle model. Figure 8 In the embodiment shown, the crossbeam or Figure 10 The cross member 16 is shown in the embodiment shown.

[0107] In some embodiments, Figure 8 In the embodiment shown, the first section 161 and the third section 163 of the crossbeam 16 are Figure 10 In the illustrated embodiment, the first section 161 and third section 163 of the crossbeam 16 have the same structure. Specifically, depending on the vehicle model, the second section 162 of the crossbeam 16 can be replaced, while the first section 161 and third section 163 can be shared by both types of crossbeams 16. Therefore, the crossbeam 16 can be replaced to suit different vehicle models, improving the vehicle's multi-power compatibility, adapting to different types of vehicles, and enabling the sharing of vehicle parts, thereby reducing costs.

[0108] The cross beam 16 is provided with weight-reducing holes to reduce the weight of the cross beam 16 .

[0109] like Figure 11 The figure shows a schematic diagram of the floor of a fuel vehicle, including a floor 15, a transmission mounting frame 17 and a drive shaft mounting frame 18. Figure 12 The diagram of the transmission mounting bracket is shown as follows: Figure 13 The following is a schematic diagram of the drive shaft mounting bracket. Please refer to Figure 12 and Figure 13 The transmission mounting bracket 17 is used to mount the transmission 3, and the drive shaft mounting bracket 18 is used to mount the drive shaft 4. Both the transmission mounting bracket 17 and the drive shaft mounting bracket 18 are connected to the floor panel 15, with the transmission mounting bracket 17 positioned closer to the front of the vehicle than the drive shaft mounting bracket 18. If the floor panel 15 is used in a plug-in hybrid vehicle or a pure electric vehicle, the transmission mounting bracket 17 and the drive shaft mounting bracket 18 may not be installed on the floor panel 15.

[0110] Please continue to refer to Figure 12 The transmission mounting frame 17 is divided into two parts, and a connecting portion connecting the two parts is provided on the floor 15.

[0111] Please continue to refer to Figure 13 The transmission shaft mounting frame 18 includes a mounting plate 181 and a reinforcement plate 182. The mounting plate 181 is in a "J"-shaped structure and is provided with a recessed portion 181a. After the mounting plate 181 and the reinforcement plate 182 are connected, an annular hole structure is formed. One end of the transmission shaft 4 passes through the hole structure, and part of the structure of the transmission shaft 4 is provided in the recessed portion.

[0112] In this embodiment, some panels are designed as split structures, which makes it easy to select the required panels for installation according to the vehicle model.

[0113] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A lower body for a vehicle, characterized in that: The lower vehicle body (1) includes a longitudinal beam, and the longitudinal beam includes a front beam (11), a beam arm (12), a middle beam (13) and a rear beam (14) connected in sequence; The beam arm (12) is tilted along the longitudinal direction Y of the vehicle, and the extension direction of the middle beam (13) and the extension direction of the rear beam (14) are both parallel to the longitudinal direction Y of the vehicle, so that the lower body (1) can meet at least three layout states.

2. The lower vehicle body according to claim 1, characterized in that: Along the longitudinal direction Y of the vehicle, a ratio L of the length of the beam arm (12) to the length of the longitudinal beam is 0.13≤L≤0.

17.

3. The lower vehicle body according to claim 1, characterized in that: The beam arm (12) is a three-way structure, and the beam arm (12) is also used to connect with the door sill.

4. The lower vehicle body according to claim 1, characterized in that: The structure of the middle beam (13) and the rear beam (14) is the same.

5. The lower vehicle body according to any one of claims 1 to 4, characterized in that: Along the width direction X of the vehicle, the longitudinal beams are symmetrical parts installed on both sides of the lower body (1); Along the width direction X of the vehicle, the area between the front beams (11) on both sides is a first arrangement area (111), the area between the beam arms (12) on both sides is a second arrangement area (121), the area between the middle beams (13) on both sides is a third arrangement area (131), and the area between the rear beams (14) on both sides is a fourth arrangement area (141); In the first layout state, the first layout area (111) and the second layout area (121) are used to arrange the engine (2) and the transmission (3), and the third layout area (131) and the fourth layout area (141) are used to arrange the transmission shaft (4) and the oil tank (5).

6. The lower vehicle body according to any one of claims 1 to 4, characterized in that: Along the width direction X of the vehicle, the longitudinal beams are symmetrical parts installed on both sides of the lower body (1); Along the width direction X of the vehicle, the area between the front beams (11) on both sides is a first arrangement area (111), the area between the beam arms (12) on both sides is a second arrangement area (121), the area between the middle beams (13) on both sides is a third arrangement area (131), and the area between the rear beams (14) on both sides is a fourth arrangement area (141); In the second layout state, the first layout area (111) and the second layout area (121) are used to arrange the engine (2) and the motor (6), the third layout area (131) is used to arrange the battery (7), and the fourth layout area (141) is used to arrange the fuel tank (5).

7. The lower vehicle body according to any one of claims 1 to 4, characterized in that: Along the width direction X of the vehicle, the longitudinal beams are symmetrical parts installed on both sides of the lower body (1); Along the width direction X of the vehicle, the area between the middle beams (13) on both sides is a third arrangement area (131), and the area between the rear beams (14) on both sides is a fourth arrangement area (141); In the third layout state, the third layout area (131) and the fourth layout area (141) are used to arrange batteries.

8. The lower vehicle body according to any one of claims 1 to 4, characterized in that: The lower vehicle body (1) further comprises a floor (15) and a crossbeam (16), wherein the crossbeam (16) is connected to the floor (15), and the crossbeam (16) is arranged below the front panel; In the first and second fabric states, a portion of the crossbeam (16) is recessed toward the floor (15) to avoid the engine (2); In the third arrangement state, the crossbeam (16) is in a straight rod structure.

9. The lower vehicle body according to any one of claims 1 to 4, characterized in that: The lower vehicle body (1) further includes a floor (15); In the first fabric state, the lower vehicle body (1) further comprises a transmission mounting frame (17) and a transmission shaft mounting frame (18), and the transmission mounting frame (17) and the transmission shaft mounting frame (18) are connected to the floor (15).

10. A vehicle, characterized in that: The vehicle comprises a lower vehicle body (1) according to any one of claims 1 to 9; The vehicle is a fuel vehicle; or, the vehicle is a pure electric vehicle; or, the vehicle is a plug-in hybrid vehicle.

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