Vehicle body middle frame structure and vehicle

Abstract

The utility model provides a vehicle body middle frame structure and a vehicle, and the vehicle body middle frame structure comprises threshold beams arranged on the left side and the right side respectively, a front floor cross beam connected between the threshold beams on the two sides, and side pedal mounting plates arranged on the threshold beams on the two sides, each side pedal mounting plate extends in the front-back direction of the whole vehicle, and in the left-right direction of the whole vehicle, one side of each side pedal mounting plate is connected to the threshold beam on the same side, and the other side of each side pedal mounting plate extends towards the outside of the vehicle relative to the threshold beam on the same side; from the left-right direction of the whole vehicle, the height of the side pedal mounting plates on the two sides and the height of the front floor cross beam in the up-down direction of the whole vehicle are different. According to the frame structure in the middle of the vehicle body, the energy absorption space of the side portion of the vehicle body can be increased through the side stepping installation plate, the energy absorption capacity of the whole vehicle during side collision is improved, meanwhile, when the vehicle is subjected to side collision, an upper force transmission path and a lower force transmission path are provided, collision force can be dispersed, and the collision safety of the whole vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle body structures, and particularly relates to a middle frame structure of a vehicle body. The utility model also relates to a vehicle provided with the above-mentioned middle frame structure of the vehicle body. Background Art

[0002] Of course, generally there are sill beams located on the left and right sides in the middle of the vehicle body, and front floor cross beams that can be used as seat installation cross beams, etc. When a vehicle collides, especially when a side collision occurs, the barrier contacts the sill beam, and the collision force will be transmitted from the sill beam to the front floor cross beam to utilize the front floor cross beam and other surrounding components for dispersion. However, since the existing collision force transmission path formed by the sill beam and the front floor cross beam is relatively single in form, the effect of absorbing and transmitting collision energy during a vehicle side collision is limited, which is not conducive to improving the overall vehicle side collision safety. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a middle frame structure of a vehicle body to facilitate improving the overall vehicle side collision safety.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A middle frame structure of a vehicle body includes sill beams separately arranged on the left and right sides, a front floor cross beam connected to the sill beams on both sides, and side step mounting plates arranged on each side of the sill beams;

[0006] Each side of the side step mounting plates extends along the front-rear direction of the whole vehicle, and in the left-right direction of the whole vehicle, one side of each side of the side step mounting plates is connected to the sill beam on the same side, and the other side of each side of the side step mounting plates extends outward from the vehicle relative to the sill beam on the same side;

[0007] Viewed from the left-right direction of the whole vehicle, the side step mounting plates on both sides and the front floor cross beam have different heights in the up-down direction of the whole vehicle.

[0008] Further, the front floor cross beam is integrally formed by an extruded profile, and the front floor cross beam penetrates through in the left-right direction of the whole vehicle and extends from the sill beam on one side to the sill beam on the other side.

[0009] Further, the front floor cross beam is directly connected to the sill beams on each side; or, the front floor cross beam is connected to the sill beams on each side through brackets.

[0010] Further, there are at least two front floor cross beams arranged at intervals along the front-rear direction of the whole vehicle; viewed from the up-down direction of the whole vehicle, one of the front floor cross beams is located between the B-pillars on the left and right sides of the vehicle body.

[0011] Furthermore, the side step mounting plate and the two threshold beams on both sides are made of extruded profiles; the side step mounting plate is integrally formed on the threshold beam, or the side step mounting plate is connected to the threshold beam through a connecting structure.

[0012] Furthermore, the threshold beam is provided with a first reinforcing rib and a second reinforcing rib that intersects and is connected to the first reinforcing rib; the first reinforcing rib is inclined in the direction pointing inward of the vehicle in the left-right direction of the whole vehicle, and during a side impact of the whole vehicle, the first reinforcing rib can form a side impact force transmission path with the front floor cross beam.

[0013] Furthermore, the first reinforcing ribs are arranged at intervals in the up-down direction of the whole vehicle, and from the front-back direction of the whole vehicle, each of the first reinforcing ribs is a "V"-shaped structure protruding to one side; among them, the protruding directions of adjacent first reinforcing ribs are opposite.

[0014] Furthermore, the side step mounting plate is connected to the connecting part located at the bottom of the threshold beam, and in the left-right direction of the whole vehicle, along the direction pointing to the connecting part, the wall thickness of the side step mounting plate gradually increases, and the wall thickness of the connecting part is not less than the wall thickness of the side step mounting plate.

[0015] Furthermore, from the left-right direction of the whole vehicle, the heights of the two side step mounting plates in the up-down direction of the whole vehicle are lower than the front floor cross beam; and / or, the front floor cross beam is provided with seat mounting points.

[0016] Compared with the prior art, the present utility model has the following advantages:

[0017] For the body middle frame structure of the present utility model, by arranging a side step mounting plate on the threshold beam and making the heights of the side step mounting plate and the front floor cross beam different in the up-down direction of the whole vehicle, not only can the side step mounting plate be used to increase the energy absorption space on the side of the body, which is beneficial to improving the energy absorption capacity during a side impact of the whole vehicle, but also, by using the different heights of the side step mounting plate and the front floor cross beam, the force transmission paths of the side step part and the front floor part can be staggered, and there can be two up-down force transmission paths when the vehicle has a side impact, which helps to disperse the collision force and is beneficial to improving the collision safety of the whole vehicle.

[0018] In addition, making the front floor cross beam be integrally formed by extrusion helps in the preparation of the front floor cross beam, and the high structural strength of the extruded profile can be utilized to ensure the structural strength of the front floor cross beam. At the same time, the through design of the front floor cross beam can form a through side impact force transmission channel to ensure the side impact force transmission effect, thereby being beneficial to improving the side impact safety of the whole vehicle.

[0019] The direct connection between the front floor crossmember and the sill beam can reduce the body components, which is conducive to reducing the material cost. Connecting the front floor crossmember to the sill beam through a bracket is beneficial for the connection between the front floor crossmember and the sill beam. The front floor crossmembers are arranged in multiple rows at intervals in the front and rear directions, which can not only better increase the lateral stiffness of the middle part of the body, but also increase the lateral force transmission channel during side impact, helping to improve the side impact force transmission effect. Arranging one of the front floor crossmembers between the two B-pillars can make the front floor crossmember play a lateral support role at the B-pillar position during side impact, helping to increase the anti-extrusion ability of the B-pillar position and being beneficial to improving the occupant safety.

[0020] Secondly, the side step mounting plate and the sill beam are made of extruded profiles, which is helpful for the preparation of the side step mounting plate and the sill beam, can ensure their structural strength, and can also utilize the good characteristics of the extruded profile to collapse and absorb energy, increasing the collision energy absorption ability at the sill position. Integrally forming the side step mounting plate and the sill beam is beneficial for their preparation and can also ensure the reliability of the connection between them. Connecting the side step mounting plate to the sill beam through a connection structure can increase the flexibility of the side step mounting skeleton setting and facilitate its maintenance and replacement.

[0021] Furthermore, the first reinforcing rib and the second reinforcing rib that are cross-connected are arranged inside the sill beam, which can improve the structural strength of the sill beam. The first reinforcing rib is inclined inward in the vehicle's left-right direction, and during a vehicle collision, the first reinforcing rib can form a side impact force transmission path with the front floor crossmember, thereby facilitating the transmission of the side impact force along the sill beam to the inner front floor crossmember, etc., and improving the side impact force transmission effect. Making the first reinforcing rib in a "V" shape can cause it to collapse and deform from the tip position of the "V" shape when the side impact is squeezed to a certain extent, enabling the sill beam to fully absorb energy and deform, helping to improve the energy absorption effect of the sill beam. Moreover, the protruding directions of adjacent first reinforcing ribs are opposite, which is also beneficial for ensuring the required structural strength of the sill beam.

[0022] In addition, making the wall thickness of the side step mounting plate gradually increase and ensuring that the wall thickness of the connection part of the sill beam is not less than the maximum wall thickness of the side step mounting plate can utilize the gradually increasing overall stiffness of the sill position from the outside to the inside, causing the body sill position to form a step-by-step collapse and energy absorption during a vehicle side impact, helping to improve the side impact energy absorption effect. Making the height of the side step mounting plate lower than that of the front floor crossmember can make more full use of the side step mounting plate for collision energy absorption and is also beneficial for the use of the side step. Seat mounting points are arranged on the front floor crossmember, making the front floor crossmember serve as a seat mounting crossmember, which helps to improve the integration of the body frame components.

[0023] Another object of the present utility model is to provide a vehicle, in which a body middle frame structure as described above is provided in the middle of the vehicle, and a battery pack is further provided between the two side sill beams; connecting cross beams are provided between the battery pack and the two side sill beams, and the connecting cross beams and the front floor cross beam are arranged corresponding to each other in the up-and-down direction of the whole vehicle.

[0024] For the vehicle of the present utility model, by adopting the above-mentioned body middle frame structure, not only can the side collision energy absorption capacity at the sill position be increased, but also a through side collision force transmission channel is formed by the through design of the front floor cross beam, which can ensure the side collision force transmission effect and is beneficial to improving the side collision safety of the whole vehicle. At the same time, the side sill beam and the frame of the battery pack are connected by connecting cross beams, which can increase the overall torsional stiffness of the middle part of the body. The connecting cross beams and the front floor cross beam are arranged corresponding to each other in the up-and-down direction of the whole vehicle, which can form a double cross beam force transmission structure and also help to improve the stability of side collision force transmission and enhance the force transmission effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0026] Figure 1 is a schematic structural view of the body middle frame structure according to an embodiment of the present utility model;

[0027] Figure 2 is a schematic structural view of the cooperation state of the side sill beam and the front floor cross beam according to an embodiment of the present utility model;

[0028] Figure 3 is a schematic structural view of the connection state of the side sill beam and the side step mounting plate according to an embodiment of the present utility model;

[0029] Figure 4 is Figure 3 a schematic structural view of the cross section of;

[0030] Figure 5 is a schematic structural view of a first type of first reinforcing rib in the side sill beam according to an embodiment of the present utility model;

[0031] Figure 6 is a schematic structural view of another type of first reinforcing rib in the side sill beam according to an embodiment of the present utility model;

[0032] Figure 7 is a schematic structural view of the first perspective of the application state of the body middle frame according to an embodiment of the present utility model;

[0033] Figure 8It is a schematic structural diagram of the second perspective of the application state of the middle body frame according to the embodiment of the present utility model;

[0034] Figure 9 It is a schematic structural diagram of the third perspective of the application state of the middle body frame according to the embodiment of the present utility model;

[0035] Figure 10 It is a partial enlarged view of the application state of the middle body frame according to the embodiment of the present utility model;

[0036] Explanation of reference numerals:

[0037] 2. Battery pack; 3. Connecting cross beam; 4. Front floor cross beam; 5. Door ring; 6. Front floor;

[0038] 11. Threshold beam; 12. Side step mounting plate; 111. First reinforcing rib; 112. Second reinforcing rib; 121. Third reinforcing rib; 122. Fourth reinforcing rib; 123. Inclined plane; 124. Connecting part; 41. First front floor cross beam; 42. Second front floor cross beam; 51. A-pillar; 52. Roof side rail; 53. B-pillar; 1101. Flange; 100. First cavity; 200. Second cavity. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0040] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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 a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting member" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0042] In the description of the present utility model, it should be noted that in this embodiment, the orientation terms such as "upper, lower, left, right, front, and rear" are defined based on the up-down direction, left-right direction, and front-rear direction of the vehicle. Among them, the up-down direction of the vehicle is also the height direction (Z-direction) of the vehicle, the front-rear direction of the vehicle is also the length direction (X-direction) of the vehicle, and the left-right direction of the vehicle is also the width direction (Y-direction) of the vehicle. "Inside and outside" are defined based on the outline of the corresponding components. For example, inside and outside the vehicle are defined based on the vehicle outline. The side closer to the middle of the vehicle is "inside", and vice versa.

[0043] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] Embodiment 1

[0045] The middle body frame structure of this embodiment is beneficial to improving the side collision safety of the whole vehicle.

[0046] In existing vehicles, the middle part of the body generally has sill beams on the left and right sides, and front floor beams that can be used as seat installation beams, etc. When the vehicle collides, especially when a side collision occurs, the barrier contacts the sill beam, and the collision force will be transmitted from the sill beam to the front floor beam to be dispersed by using the front floor beam and other surrounding components. However, since the collision force transmission path formed by the existing sill beam and the front floor beam is relatively single in form, the absorption and transmission of collision energy at the sill position during a vehicle side collision have limited energy absorption effect, which is not conducive to improving the side collision safety of the whole vehicle.

[0047] To solve the above technical problems, this embodiment proposes a new middle body frame structure. And in terms of the overall composition, as Figure 1 and Figure 2 shown, the middle body frame structure of this embodiment includes sill beams 11 provided on the left and right sides respectively, a front floor beam 4 connected between the two side sill beams 11, and side step mounting plates 12 provided on each side sill beam 11. Among them, each side step mounting plate 12 extends along the front-rear direction of the whole vehicle, and in the left-right direction of the whole vehicle, one side of each side step mounting plate 12 is connected to the same side sill beam 11, and the other side of each side step mounting plate 12 extends outward relative to the same side sill beam 11. And from the left-right direction of the whole vehicle, the heights of the two side step mounting plates 12 and the front floor beam 4 in the up-down direction of the whole vehicle are different.

[0048] At this time, in the above structure, by arranging the side step mounting plate 12 on the sill beam 11 and making the height of the side step mounting plate 12 different from that of the front floor cross beam 4 in the normal up and down direction, not only can the side step mounting plate 12 be used to increase the energy absorption space on the side of the vehicle body, which is beneficial to improving the energy absorption capacity during the side collision of the whole vehicle, but also when the vehicle has a side collision, two upper and lower force transmission paths can be formed in the middle of the vehicle body, which helps to disperse the collision force and is beneficial to improving the collision safety of the whole vehicle.

[0049] Based on the above overall introduction, specifically speaking, still referring to Figure 1 and Figure 2 , in this embodiment, the sill beams 11 on both sides extend along the length direction of the whole vehicle, the front floor cross beam 4 extends along the width direction of the whole vehicle, and both ends of the front floor cross beam 4 are respectively connected to the sill beams 11 on both sides. As a preferred implementation manner, in this embodiment, the front floor cross beam 4 is integrally formed by an extruded profile, and the front floor cross beam 4 is arranged to penetrate through the whole vehicle in the left and right direction of the vehicle and extends from one sill beam 11 to the other sill beam 11.

[0050] By making the front floor cross beam 4 integrally formed by an extruded profile, it helps in the preparation of the front floor cross beam 4, and the characteristics of relatively high structural strength of the extruded profile can be utilized to ensure the structural strength of the front floor cross beam 4. At the same time, the through design of the front floor cross beam 4 can be used to form a through side collision force transmission channel to ensure the side collision force transmission effect, thus being beneficial to improving the side collision safety of the whole vehicle.

[0051] Also as a preferred implementation manner, as shown in Figure 1 and Figure 2 and combined with Figure 9 and Figure 10 , from the left and right direction of the whole vehicle, the height of the side step mounting plates 12 on both sides in the up and down direction of the whole vehicle is lower than that of the front floor cross beam 4. Thus, not only can the side step mounting plate be more fully utilized for collision energy absorption, but it is also beneficial to the use of the side step.

[0052] In this embodiment, as a preferred implementation manner, the front floor cross beam 4 is directly connected to each side sill beam 11. In this way, the body parts can be reduced, which is beneficial to reducing the material cost. Of course, it can be understood that in addition to being directly connected, the front floor cross beam 4 and each side sill beam 11 can also be connected through a bracket, and when the front floor cross beam 4 is connected to the sill beam 11 through the bracket, it is beneficial to the connection between the front floor cross beam 4 and the sill beam 11.

[0053] It should be noted here that the direct connection mentioned above can be achieved by welding, riveting, screwing or other means. When the front floor cross member 4 and the sill beam 11 are connected by a bracket, the bracket can be a sheet metal bracket or an extruded profile, and the front floor cross member 4, the bracket and the sill beam 11 can also be connected together by screwing, riveting or other means.

[0054] In this embodiment, the front floor cross member 4 is preferably made of an aluminum alloy extruded profile. At this time, making the front floor cross member 4 of an aluminum alloy extruded profile is beneficial to the lightweight design of the front floor cross member. Also preferably, seat mounting points are provided on the front floor cross member 4, so that the front floor cross member 4 can be used as a seat mounting cross member, which helps to improve the integration of the body frame components.

[0055] As a preferred embodiment, in this embodiment, the front floor cross member 4 is disposed on the front floor 6, wherein the front floor 6 is welded to both side sill beams 11, and the front floor cross member 4 is at least two arranged at intervals along the front-rear direction of the whole vehicle on the front floor 6. Continuing to refer to Figure 1 and Figure 2 As shown, the front floor cross member 4 is two arranged at intervals along the front-rear direction of the whole vehicle, that is, the first front floor cross member 41 and the second front floor cross member 42. Of course, in addition to arranging two at intervals, the front floor cross member 4 can also be arranged in three, four, five, etc. at intervals. At this time, through multiple front floor cross members 4 arranged at intervals front and rear, not only can the lateral stiffness of the middle part of the body be better increased, but also the lateral force transmission channel in side impact can be increased, which helps to improve the side impact force transmission effect.

[0056] In this embodiment, door rings 5 are respectively provided on the upper parts of the two side sill beams 11, wherein Figure 1 the door ring 5 shown in is the front door ring, that is, the door ring structure composed of the A-pillar 51, the roof side rail 52 and the B-pillar 53. In terms of structure, there is an interval between the bottom ends of the A-pillar 51 and the B-pillar 53 and an open structure is formed. And in specific implementation, the bottom ends of the two side door rings 5 are respectively connected to the same side sill beam 11. Specifically, upwardly protruding flanges 1101 are provided on the tops of the respective sill beams 11, and the bottom ends of the two side door rings 5, that is, the bottom ends of the A-pillar 51 and the B-pillar 53, are respectively connected to the flanges 1101 on the same side. By providing the upwardly protruding flanges 1101 on the sill beam 11, the connection strength between the door ring 5 and the sill beam 11 can be increased, and it is also convenient for the connection between the door ring 5 and the sill beam 11.

[0057] As a preferred embodiment, in this embodiment, when viewed from the up-and-down direction of the whole vehicle, one of the front floor crossbeams 4 is located between the B-pillars 53 on the left and right sides of the vehicle body. In this way, during a side impact, the front floor crossbeam 4 can play a lateral supporting role in the position of the B-pillar 53, which helps to increase the anti-extrusion ability of the B-pillar position and is beneficial to improving the safety of the occupants.

[0058] In this embodiment, referring to Figures 1 to 4 As shown, side step mounting plates 12 are provided on both sides of the sill beams 11. Each side step mounting plate 12 extends along the front-rear direction of the whole vehicle, and in the left-right direction of the whole vehicle, one side of each side step mounting plate 12 is connected to the sill beam 11 on the same side, and the other side of each side step mounting plate 12 extends outward relative to the sill beam 11 on the same side.

[0059] It should be noted that the side step mounting plate 12 in this embodiment is mainly used as the basic skeleton of the vehicle side step. In specific implementation, generally, a side step decorative plate and the like will be further provided on the side step mounting plate 12 to cover the side step mounting plate 12 and improve the overall aesthetics of the vehicle side step position. At the same time, in addition to the decorative plate, of course, according to the design requirements of specific vehicle models, taking the side step mounting plate 12 as the installation basis, a projection module located at the side step position can be further provided, etc., so as to better improve the technological sense of the vehicle and the quality of the whole vehicle.

[0060] And in specific implementation, the side step mounting plate 12 and the sill beams 11 on both sides in this embodiment are preferably made of extruded profiles, and further preferably made of aluminum alloy extruded profiles. This helps the preparation of the side step mounting plate 12 and the sill beam 11, can ensure the structural strength of both, and at the same time can utilize the good characteristics of the extruded profile to collapse and absorb energy, and can increase the collision energy absorption ability of the sill position.

[0061] As Figures 2 to 4 shown, as a preferred embodiment, in this embodiment, the side step mounting plate 12 is integrally formed on the sill beam 11. At this time, setting the side step mounting plate 12 and the sill beam 11 to be integrally formed is beneficial to the preparation of both and can also ensure the reliability of the connection between the two. Moreover, the sill beam 11 and the side step mounting plate 12 are of an integral structure, which is also suitable for ensuring the overall stiffness of the side part of the vehicle body while making the door ring 5 adopt an open structure.

[0062] It can be understood that in addition to the integrally formed connection method between the side step mounting plate 12 and the sill beam 11, the side step mounting plate 12 can also be connected to the sill beam 11 through a connection structure. At this time, using the connection structure to connect the side step mounting plate 12 and the sill beam 11 can increase the flexibility of setting the side step mounting skeleton and is also convenient for its maintenance and replacement.

[0063] Among them, the above-mentioned connection structure can adopt a screwed connection structure for example. Specifically, during implementation, a projection welding nut can be arranged in the sill beam 11, and a connection hole can be arranged on the side step mounting plate 12. The side step mounting plate 12 is screwed to the sill beam 11 through a bolt passing through the connection hole and screwed to the projection welding nut.

[0064] As a further preferred implementation manner, in this embodiment, a first reinforcing rib 111 and a second reinforcing rib 112 cross-connected to the first reinforcing rib 111 are arranged in the sill beam 11. Among them, the first reinforcing rib 111 is inclined upward in the direction pointing to the inside of the vehicle in the left-right direction of the whole vehicle. And the cross-connected first reinforcing rib 111 and second reinforcing rib 112 divide the inside of the sill beam 11 into a plurality of first cavities 100. At this time, arranging the cross-connected first reinforcing rib 111 and second reinforcing rib 112 in the sill beam 11 can improve the structural strength of the sill beam, and making the first reinforcing rib 111 inclined upward in the direction pointing to the inside of the vehicle in the left-right direction of the whole vehicle can facilitate guiding the collision force to be transmitted obliquely upward along the first reinforcing rib 111.

[0065] It should be noted here that the arrangement direction of the second reinforcing rib 112 is not limited in this embodiment, and it can be arranged obliquely as shown in Figure 4 or arranged vertically in the vehicle height direction, as long as the second reinforcing rib 112 is connected to the first reinforcing rib 111.

[0066] In this embodiment, on the basis of arranging the cross-connected first reinforcing rib 111 and second reinforcing rib 112 in the sill beam 11 and the first reinforcing rib 111 being inclined upward in the direction pointing to the inside of the vehicle, when the vehicle has a side collision, the first reinforcing rib 111 of this embodiment can form a side collision force transmission path with the front floor cross beam 4. This can facilitate the side collision force to be transmitted along the sill beam 11 to the inner seat mounting cross beam 4, thereby improving the side collision force transmission effect.

[0067] In this embodiment, the first reinforcing ribs 111 are multiple and arranged at intervals in the up-down direction of the whole vehicle. As a preferred implementation manner, the multiple first reinforcing ribs 111 can be arranged obliquely upward in a straight shape in the direction of the inside of the vehicle as shown in Figure 4 . It can be understood here that in addition to adopting the above structural form, each first reinforcing rib 111 can also adopt other structural forms. For example, the multiple first reinforcing ribs 111 can also be as shown in Figure 5 and Figure 6 .

[0068] Refer to Figure 5 and Figure 6As shown, when viewed from the front-rear direction of the whole vehicle, each first reinforcing rib 111 is a "V"-shaped structure protruding to one side. Among them, the protruding directions of adjacent first reinforcing ribs 111 are opposite. In this way, the first reinforcing rib 111 is in a "V" shape. At this time, when the side collision is squeezed to a certain extent, it collapses and deforms from the tip position of the "V" shape, enabling the sill beam 11 to fully absorb energy and deform, which helps to improve the energy absorption effect of the sill beam 11. Moreover, the opposite protruding directions of adjacent first reinforcing ribs 111 are also beneficial to ensuring that the sill beam 11 has the required structural strength.

[0069] In this embodiment, referring to Figures 3 to 6 As shown, a third reinforcing rib 121 and a fourth reinforcing rib 122 cross-connected to the third reinforcing rib 121 are provided inside the side step mounting plate 12. Among them, there are multiple third reinforcing ribs 121 and fourth reinforcing ribs 122 arranged at intervals. Each third reinforcing rib 121 is arranged along the height direction of the whole vehicle, and each fourth reinforcing rib 122 is generally in a "V" shape and extends along the width direction of the whole vehicle. Moreover, the cross-connected third reinforcing rib 121 and fourth reinforcing rib 122 divide the inside of the side step mounting plate 12 into multiple second cavities 200. With such a setting, it can also improve the structural strength of the side step mounting plate 12. Moreover, by designing the fourth reinforcing rib 122 in a "V" shape, when the side step mounting plate 12 is squeezed to a certain extent, it collapses and deforms from the tip position of the "V" shape, enabling the side step mounting plate 12 to fully absorb energy and deform, which is beneficial to improving the energy absorption effect of the side step mounting plate 12.

[0070] Continuing to refer to Figures 3 to 6 As shown, in this embodiment, the side step mounting plate 12 is connected to the connecting portion 124 at the bottom of the sill beam 11. And in the left-right direction of the whole vehicle, along the direction pointing to the connecting portion 124, the wall thickness of the side step mounting plate 12 gradually increases, and the wall thickness of the connecting portion 124 is not less than the wall thickness of the side step mounting plate 12. With such a setting, the overall stiffness of the sill structure can be gradually increased from the outside to the inside. And using this feature, during a side collision of the whole vehicle, a step-by-step collapsing and energy-absorbing structure can be formed at the body sill position, which helps to improve the side collision energy absorption effect.

[0071] During specific implementation, in the left-right direction of the whole vehicle, the wall thickness of the outer part of the side step mounting plate 12 is set to 2 mm, for example, the wall thickness of the middle part is set to 2.2 mm, 2.3 mm or 2.4 mm, etc., the wall thickness of the inner part is set to 2.5 mm, for example, and the thickness of the sill beam 11 is set to 2.5 mm or 2.6 mm, etc. In this way, during the collision process, the part with a thinner wall thickness deforms first, and then the part with a thicker wall thickness deforms, thus forming a stepped collapsing structure, which is beneficial to improving the side collision stability.

[0072] The body middle frame structure of this embodiment not only helps in the preparation of the sill beam 11 and the front floor cross beam 4, but also takes advantage of the better crush energy absorption characteristics of the extruded profile to increase the side collision energy absorption capacity at the sill position. At the same time, it can also utilize the through design of the front floor cross beam to form a continuous side collision force transmission channel, ensuring the side collision force transmission effect, thereby facilitating the improvement of the vehicle's side collision safety.

[0073] Embodiment 2

[0074] This embodiment relates to a vehicle, in the middle of which there is the body middle frame structure of Embodiment 1, as Figures 7 to 10 shown. In the middle of the vehicle of this embodiment, there is also a battery pack 2 located between the two side sill beams 11. Among them, there are connecting cross beams 3 between the battery pack 2 and the two side sill beams 11, and the connecting cross beam 3 and the front floor cross beam 11 are arranged corresponding to each other in the up and down direction of the whole vehicle.

[0075] Specifically, the connecting cross beam 3 is arranged along the left and right direction of the whole vehicle, and both ends are respectively connected to the bottom of the sill beam 11 and the frame of the battery pack 2. Moreover, preferably, both between the connecting cross beam 3 and the sill beam 11 and between the connecting cross beam 3 and the frame of the battery pack 2 are connected together by screw connection. This can facilitate the installation and disassembly of the battery pack 2 and improve the convenience of assembling the battery pack 2.

[0076] In this embodiment, from Figures 8 to 10 , and in combination with Figure 4 shown, the bottom of the side step mounting plate 12 also has an inclined surface 123, and, in the left and right direction of the whole vehicle, the inclined surface 123 is inclined downward in the direction pointing to the sill beam 11. In this way, it can form a better guiding effect on the side collision force, which is beneficial to the transmission of the collision force at the side step mounting plate 12 to the connecting cross beam 3 during a side collision, so as to fully decompose the collision force with the help of the frame of the battery pack 2 and improve the dispersion effect of the collision force.

[0077] It should be noted that, from the front and back direction of the whole vehicle, the connection position of the connecting cross beam 3 and the frame of the battery pack 2 can be, for example, lower than its connection position with the sill beam 11, so that the connecting cross beam 3 is inclined. Of course, it can be understood here that in addition to being inclined, the connecting cross beam 3 can also be arranged horizontally as a whole.

[0078] Combined with Figure 7 and Figure 8As shown, in this embodiment, the front floor crossbeam 4 includes a first front floor crossbeam 41 and a second front floor crossbeam 42 which are arranged at intervals in the front-rear direction of the whole vehicle. At this time, the connecting crossbeams 3 are two groups arranged left and right in the width direction of the whole vehicle, and each group includes a front connecting crossbeam and a rear connecting crossbeam arranged at intervals in the length direction of the whole vehicle, that is, there are four connecting crossbeams 3 arranged on the left and right sides of the battery pack 2 and at intervals. One end of each connecting crossbeam is screwed to the bottom of the corresponding side sill beam 11, and the other end is screwed to the corresponding side of the frame of the battery pack 2, which is beneficial to improving the installation stability of the battery pack 2.

[0079] Moreover, each connecting crossbeam 3 is located below the battery pack 2 relative to the front floor crossbeam 4. Also, the two front connecting crossbeams and the first front floor crossbeam 41 are correspondingly arranged in the up-down direction of the whole vehicle, and the two rear connecting crossbeams and the second front floor crossbeam 42 are correspondingly arranged in the up-down direction of the whole vehicle. In this way, a double-layer frame structure is formed among the front floor crossbeam 4, the sill 11, the side step mounting plate 12 and the connecting crossbeam 3, thereby improving the overall torsional stiffness of the vehicle body.

[0080] In this embodiment, during a side collision of the whole vehicle, multiple force transmission paths are formed between the body sill position and the surrounding components, such as Figure 10 shown, force transmission path a: The collision force is transmitted from the side step mounting plate 12 through the sill beam 11 and the connecting crossbeam 3 to the frame of the battery pack 2. Force transmission paths b, c, d: The collision force is transmitted from the side step mounting plate 12 through the bottom of the sill beam 11 and inclined upward to the front floor crossbeam 4, or along the guidance of multiple first reinforcing ribs 111 in the sill beam 11, so that the collision force is inclined upward and transmitted to the seat mounting crossbeam 4.

[0081] For the vehicle of this embodiment, by adopting the body middle frame structure of Embodiment 1, not only can the side collision energy absorption capacity at the sill position be increased, but also a through side collision force transmission channel is formed by the through design of the front floor crossbeam 4, which can also ensure the side collision force transmission effect and is beneficial to improving the side collision safety of the whole vehicle. At the same time, the sill beam 11 and the frame of the battery pack 2 are connected by the connecting crossbeam 3, which can increase the overall torsional stiffness of the middle part of the vehicle body. The connecting crossbeam 3 and the front floor crossbeam 4 are correspondingly arranged in the up-down direction of the whole vehicle, which can form a double crossbeam force transmission structure and also help to improve the stability of side collision force transmission and the force transmission effect.

[0082] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle body mid-frame structure, characterized in that: It comprises threshold beams (11) arranged on the left and right sides, a front floor crossbeam (4) connected between the threshold beams (11) on both sides, and a side step mounting plate (12) arranged on the threshold beams (11) on each side; The side step mounting plates (12) on each side extend along the front-rear direction of the vehicle, and in the left-right direction of the vehicle, one side of the side step mounting plates (12) on each side is connected to the door sill beam (11) on the same side, and the other side of the side step mounting plates (12) on each side extends toward the vehicle outside relative to the door sill beam (11) on the same side; When viewed from the left and right directions of the vehicle, the side step mounting plates (12) on both sides and the front floor cross beam (4) are at different heights in the up and down directions of the vehicle.

2. The vehicle body mid-frame structure according to claim 1, characterized in that: The front floor cross beam (4) is integrally formed by extrusion profiles, and the front floor cross beam (4) is arranged to penetrate the entire vehicle in the left-right direction and extends from the sill beam (11) on one side to the sill beam (11) on the other side.

3. The vehicle body mid-frame structure according to claim 1, characterized in that: The front floor cross beam (4) is directly connected to the door sill beams (11) on each side; or, The front floor cross beam (4) and the door sill beams (11) on each side are connected via brackets.

4. The vehicle body mid-frame structure according to claim 1, characterized in that: The front floor cross beams (4) are at least two arranged at intervals along the front-rear direction of the vehicle; Viewed from the upper and lower directions of the vehicle, one of the front floor cross beams (4) is located between the left and right B pillars (53) in the vehicle body.

5. The vehicle body mid-frame structure according to claim 4, characterized in that: The side step mounting plate (12) and the door sill beams (11) on both sides are made of extruded profiles; The side step mounting plate (12) is integrally formed on the door sill beam (11), or the side step mounting plate (12) is connected to the door sill beam (11) via a connecting structure.

6. The vehicle body mid-frame structure according to claim 5, characterized in that: The threshold beam (11) is provided with a first reinforcing rib (111) and a second reinforcing rib (112) cross-connected with the first reinforcing rib (111); The first reinforcing rib (111) is arranged in an inclined direction toward the interior of the vehicle in the left-right direction of the vehicle, and when the vehicle is subjected to a side collision, the first reinforcing rib (111) can form a side collision force transmission path with the front floor cross beam (4).

7. The vehicle body mid-frame structure according to claim 6, characterized in that: The first reinforcing ribs (111) are multiple and arranged at intervals along the vertical direction of the vehicle, and when viewed from the front-rear direction of the vehicle, each of the first reinforcing ribs (111) is a "V"-shaped structure protruding to one side; Wherein, the protruding directions of adjacent first reinforcing ribs (111) are opposite.

8. The vehicle body mid-frame structure according to claim 5, characterized in that: The side step mounting plate (12) is connected to a connecting portion (124) located at the bottom of the door sill beam (11), and in the left-right direction of the vehicle, along the direction pointing to the connecting portion (124), the wall thickness of the side step mounting plate (12) is gradually increased, and the wall thickness of the connecting portion (124) is not less than the wall thickness of the side step mounting plate (12).

9. The vehicle body mid-frame structure according to any one of claims 1 to 8, characterized in that: When viewed from the left and right directions of the vehicle, the heights of the side step mounting plates (12) on both sides in the vertical direction of the vehicle are lower than those of the front floor crossbeam (4); and / or, The front floor cross beam (4) is provided with a seat mounting point.

10. A vehicle, characterized in that: The middle part of the vehicle is provided with a vehicle body middle frame structure as claimed in any one of claims 1 to 9, and is also provided with a battery pack (2) located between the sill beams (11) on both sides; A connecting crossbeam (3) is provided between the battery pack (2) and the door sill beams (11) on both sides, and the connecting crossbeam (3) and the front floor crossbeam (4) are arranged correspondingly in the up-down direction of the vehicle.

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