Vehicle body lower part assembly and vehicle

Abstract

The utility model aims to provide a vehicle body lower part assembly and a vehicle so as to solve the problems that an existing vehicle body lower part assembly is poor in light weight effect and poor in part integration degree. The vehicle body lower part assembly is integrally formed by adopting an aluminum alloy die-casting process and comprises a front cabin area, a front floor area and a rear floor area, the front cabin area comprises a front longitudinal beam and a first cross beam; the front floor area includes: a sill beam; the rear floor area comprises a rear longitudinal beam, a second cross beam, a third cross beam and a fourth cross beam; the first cross beam, the second cross beam, the third cross beam, the fourth cross beam, the doorsill beam and the rear longitudinal beam are designed to form a structural layout that a small ring is sleeved with a large ring.

Description

Technical Field

[0001] This utility model relates to the field of automobile design and automobile manufacturing technology, specifically to a lower body component and a vehicle. Background Technology

[0002] With the increasing popularity of new energy vehicles, users have higher and higher requirements for driving experience and range. Only high-performance, lightweight, and integrated body structure design can meet users' experience needs. Therefore, how to improve body rigidity while reducing body weight and achieving lean design and production are currently key indicators of body technology.

[0003] The existing lower body structure includes a battery pack housing integrated with the body in the middle of the lower body, connectors connected to the front and rear ends of the battery pack housing, a front lower body structure connected to the front connectors, and a rear lower body structure connected to the rear connectors. The front lower body structure includes a one-piece die-cast front engine compartment, and the rear lower body structure includes a one-piece die-cast rear floor. By integrating the battery pack housing with the body and using die-cast structures for both the front engine compartment and the rear floor, the lower body structure can be easily molded, reducing manufacturing costs and contributing to the overall strength and lightweight of the lower body.

[0004] The existing technology uses die casting to connect the front engine compartment and rear floor to the battery pack housing, but the entire lower body does not form an integrated structure, and the integration of components and the effect of lightweighting need to be improved. Utility Model Content

[0005] The purpose of this utility model is to provide a vehicle body lower component and vehicle to solve the problems of insufficient lightweight effect and insufficient component integration of existing vehicle body lower components.

[0006] The beneficial effects of this application are as follows:

[0007] A vehicle body lower component is integrally formed using an aluminum alloy die-casting process, and the vehicle body lower component includes: a front engine compartment area, a front floor area, and a rear floor area;

[0008] The forward engine compartment area includes: a front longitudinal beam and a first transverse beam;

[0009] The front floor area includes: a sill beam;

[0010] The rear floor area includes: a rear longitudinal beam, a second crossbeam, a third crossbeam, and a fourth crossbeam;

[0011] The first crossbeam, the second crossbeam, the third crossbeam, the fourth crossbeam, the sill beam, and the rear longitudinal beam are designed to form a large ring enclosing a small ring structure.

[0012] Preferably, the cavities of the front longitudinal beam, the first cross beam, the sill beam, the rear longitudinal beam, the second cross beam, the third cross beam, the fourth cross beam, and the rear longitudinal beam are all provided with crisscrossing structural ribs;

[0013] The thickness of the structural reinforcement is between 3-5 mm along the length of the corresponding beam, and between 2.55-3.5 mm along the other directions.

[0014] Preferably, the front longitudinal beam has an opening in the outward direction of the vehicle width direction;

[0015] The threshold beam, the first crossbeam, the second crossbeam, the third crossbeam, the fourth crossbeam, and the rear longitudinal beam all open downwards.

[0016] Preferably, the front longitudinal beam includes: a lower front longitudinal beam plate, an inner front longitudinal beam plate, and an upper front longitudinal beam plate connected in sequence; the interior of the front longitudinal beam is divided into a double-cavity arrangement by longitudinal ribs of the front longitudinal beam that are connected to the inner front longitudinal beam plate and arranged along the length direction of the front longitudinal beam.

[0017] Preferably, the sill beam includes: a sill beam upper plate;

[0018] The inner and outer plates of the sill beam are connected to the lower surface of the upper plate of the sill beam.

[0019] The battery sealing plate is connected to the inner plate of the sill beam;

[0020] A door opening stop plate connected to the upper plate and outer plate of the threshold beam;

[0021] The interior of the threshold beam is divided into a double-cavity arrangement by the longitudinal ribs of the threshold beam that are connected to the upper plate of the threshold beam and are arranged along the length of the threshold beam.

[0022] Preferably, the first crossbeam, the second crossbeam, the third crossbeam, and the fourth crossbeam comprise: a floor and a first structural plate and a second structural plate connected to the lower surface of the floor.

[0023] Preferably, the front longitudinal beam has a first structural rib in the front section facing forward of the vehicle, and a second structural rib in the rear section facing backward of the vehicle.

[0024] The threshold beam is equipped with a third structural reinforcement;

[0025] The first crossbeam is equipped with a fourth structural reinforcement.

[0026] The second, third, and fourth crossbeams are provided with fifth structural reinforcement bars;

[0027] The rear longitudinal beam is equipped with a sixth structural reinforcement.

[0028] Preferably, the front cabin area further includes: a front wheel arch, an A-pillar, and a front bulkhead; the front wheel arch includes: a front crossbeam and an upper crossbeam.

[0029] The A-pillar, the front longitudinal beam, the front crossbeam of the front wheel arch, and the upper crossbeam of the front wheel arch together form an outward-opening ring structure.

[0030] Preferably, the rear floor area further includes: a rear wheel arch and a rear floor panel; the rear wheel arch includes an inner rear wheel arch panel and an outer rear wheel arch panel, the inner rear wheel arch panel and the outer rear wheel arch panel together forming a downward-opening hemispherical structure;

[0031] The thickness of the plate-like areas on the front wall panel, the front wheel arch, the rear floor panel, and the rear wheel arch is between 2.5 and 3.5 mm.

[0032] Preferably, the thickness of the front longitudinal beam is between 4-7 mm, and the thickness of the first crossbeam, the second crossbeam, the third crossbeam, and the fourth crossbeam is between 3-5 mm.

[0033] This application also provides a vehicle including the aforementioned lower body component.

[0034] The beneficial effects of this application are as follows:

[0035] The lower body component no longer uses the traditional structure of multiple sheet metal welds, but instead adopts a one-piece molding process using aluminum alloy die casting. This lower body component integrates nearly 200 parts from the front engine compartment assembly, front floor assembly, and rear floor assembly into a single unit, resulting in a strong overall design and high component integration. This achieves the product design and production requirements of lightweight, high-performance, and lean manufacturing for the vehicle body. Specifically:

[0036] The lower body components are made of aluminum alloy with a density of 2700 kg / m³, only one-third that of steel. The unibody die-casting process eliminates the need for overlapping seams in traditional multi-sheet metal welding structures, further reducing weight. The unibody die-casting structure offers high design freedom; through CAE simulation analysis, precise material thickness and reinforcing rib design can be achieved, facilitating the attainment of various performance targets and resulting in a weight reduction of over 25%.

[0037] The lower body components are manufactured using a one-piece die-casting process, with the underbody beams forming an independent frame structure. This frame adopts a "two longitudinal and four transverse" full-frame structure, significantly improving the bending and torsional rigidity of the lower body. The two longitudinal beams of this frame run smoothly from the front to the rear of the vehicle, ensuring smooth force transmission and better absorption of collision energy. The front wheel arches use a ring beam structure and a net-like structural rib, which effectively improves the dynamic rigidity of the front shock absorber mounting, enhancing the user's driving experience.

[0038] The lower body component integrates nearly 200 parts into one, eliminating internal connecting welds, stamping, welding processes and related investments. The number of molds has been reduced from nearly 800 sets to one set, the number of fixtures from nearly 200 sets to four sets, and the number of inspection tools from nearly 200 sets to one set, significantly reducing tooling and manpower input and achieving lean production. The lower body component is integrally molded, reducing the accumulation of dimensional chain errors. Furthermore, important mounting points and mating surfaces are machined with high precision, which can reduce the body development and debugging time and shorten the project development cycle to a certain extent.

[0039] The lower body components are manufactured using a one-piece die-casting process, resulting in a monolithic structure. Compared to traditional multi-sheet metal welding structures, this reduces weld overlaps and openings directly into the vehicle, improving overall airtightness and wading capability, and enhancing the user's driving experience. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the lower body component of an embodiment of the present utility model;

[0041] Figure 2 This is a schematic diagram of the lower body component of an embodiment of the present utility model;

[0042] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0043] Figure 4 yes Figure 2 Cross-sectional view at point BB;

[0044] Figure 5 yes Figure 2 Cross-sectional view at CC;

[0045] Figure 6 This is a partial front view of the front wheel arch;

[0046] The symbols of the main components in the diagram are explained below:

[0047] 510—Forward cabin area; 520—Forward floor area; 530—Rear floor area;

[0048] 511—Left front longitudinal beam, 512—Right front longitudinal beam, 513—First crossbeam, 514—Front wall panel, 515—Left front wheel arch, 516—Right front wheel arch, 517—Left A-pillar, 518—Right A-pillar;

[0049] 521—Left door sill beam, 522—Right door sill beam;

[0050] 531—Left rear longitudinal beam, 532—Right rear longitudinal beam, 533—Second crossbeam, 534—Third crossbeam, 535—Fourth crossbeam, 536—Rear floor panel, 537—Left rear wheel cover, 538—Right rear wheel cover;

[0051] 5121—Lower slab of front longitudinal beam, 5122—Longitudinal reinforcement of front longitudinal beam, 5123—Upper slab of front longitudinal beam, 5124—Inner slab of front longitudinal beam;

[0052] 5221—Inner plate of threshold beam; 5222—Longitudinal reinforcement of threshold beam; 5223—Outer plate of threshold beam; 5224—Battery sealing surface; 5225—Door opening stop plate; 5226—Upper plate of threshold beam.

[0053] 5351—First structural slab, 5352—Second structural slab, 5353—Floor;

[0054] 5151—Front crossbeam of the front wheel arch, 5152—Upper crossbeam of the front wheel arch. Detailed Implementation

[0055] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the figures for those skilled in the art.

[0056] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. In the description of this application, terms such as "first", "second", etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0057] The specific implementation is as follows:

[0058] See Figure 1 The lower body component of the vehicle described in this utility model is integrally formed by aluminum alloy die casting process and consists of a front engine compartment area 510, a front floor area 520 and a rear floor area 530.

[0059] See Figure 1 and Figure 2 The front engine compartment area 510 includes: left front longitudinal beam 511, right front longitudinal beam 512, first crossbeam 513, front bulkhead 514, left front wheel arch 515, right front wheel arch 516, left A-pillar 517 and right A-pillar 518.

[0060] See Figure 1 and Figure 2 The front floor area 520 includes a front floor panel, a left sill beam 521, and a right sill beam 522. In this embodiment, the front floor panel can be integrated with the battery housing. The left sill beam 521 and the right sill beam 522 only provide a sealing surface structure around the battery and a mounting point for the battery housing. If the front floor panel is not integrated with the battery housing, the front floor area 520 should also include the front floor panel.

[0061] See Figure 1 and Figure 2 The rear floor area 530 includes: a left rear longitudinal beam 531, a right rear longitudinal beam 532, a second crossbeam 533, a third crossbeam 534, a fourth crossbeam 535, a rear floor panel 536, a left rear wheel arch 537, and a right rear wheel arch 538.

[0062] For details, see Figure 1 The lower body component of the vehicle described in this utility model adopts an overall upper and lower demolding structure, while the front engine compartment area 510 adopts a left and right demolding structure design.

[0063] For details, see Figure 2, the lower frame beam composed of the first cross beam 513 in the front engine compartment area 510, the left sill beam 521 and the right sill beam 522 in the front floor area 520, the left rear longitudinal beam 531, the right rear longitudinal beam 532, the second cross beam 533, the third cross beam 534, and the third cross beam 535 in the rear floor area 530 has a main body cross-section with an opening facing downwards, forming a "ㄇ" shaped cross-section.

[0064] Specifically, refer to Figure 1 , the left rear wheel housing 537 and the rear rear wheel housing 538 in the rear floor area 530 are respectively shaped like a hemispherical shape with an opening facing downwards.

[0065] Specifically, refer to Figure 1 , the left front longitudinal beam 511, the right front longitudinal beam 512, the left A pillar 517 and the right A pillar 518 in the front engine compartment area 510 have a main body cross-section with an opening facing outwards, forming a "匚" shaped cross-section structure.

[0066] Specifically, refer to Figure 1 , the left front wheel housing 515 and the right front wheel housing 516 in the front engine compartment area 510 are respectively shaped like a hemispherical shape with an opening facing outwards. For the above-mentioned areas, the design direction of all the reinforcing ribs is guaranteed to be consistent with the overall demolding direction of the lower body components described above.

[0067] Specifically, refer to Figure 2 , the underbody beam system of the lower body components of the present utility model forms an independent frame structure. This frame adopts a "two longitudinal and four transverse" full-frame structure design, forming a large ring nesting a small ring structure, effectively improving the bending and torsional stiffness of the frame. Specifically, the "two longitudinal" structure is formed by the left front longitudinal beam 511, the left sill beam 521, the left rear longitudinal beam 531 and the right front longitudinal beam 512, the right sill beam 522, the right rear longitudinal beam 532. This longitudinal beam is a complete integral structure with a gentle transition area, directly penetrating from the front of the vehicle to the rear of the vehicle, and can well transmit and absorb the energy brought by vehicle collision, improving the overall safety performance of the vehicle. Specifically, the "four transverse" structure is composed of the first cross beam 513, the second cross beam 533, the third cross beam 534, and the fourth cross beam 535.

[0068] Furthermore, to improve the overall performance of the frame structure, the recommended design material thickness of each longitudinal beam is 4 - 7 mm, and the recommended design material thickness of each cross beam is 3 - 5 mm. The specific design material thickness is subject to simulation analysis.

[0069] Furthermore, there is an arrangement of criss-crossing structural ribs inside the cavities of each longitudinal beam and each cross beam. The recommended design material thickness of the structural ribs consistent with the length direction of the longitudinal beam and the cross beam is 3 - 5 mm, and the recommended design material thickness of the structural ribs in the other directions is 2.5 - 3.5 mm. The specific design material thickness is subject to simulation analysis.

[0070] Furthermore, refer to Figure 3Both the left front longitudinal beam 511 and the right front longitudinal beam 512 adopt a double-cavity arrangement with an "E"-shaped cross-section and outward opening. Taking the right front longitudinal beam as an example, the right front longitudinal beam 512 consists of: a lower plate 5121, longitudinal reinforcement 5122, an upper plate 5123, and an inner plate 5124. Further details can be found in the documentation. Figure 1 According to the collision force requirements, the left front longitudinal beam 511 and the right front longitudinal beam 512 are designed with additional transverse structural reinforcement. The front part adopts the first structural reinforcement arrangement (such as the "+" shaped structural reinforcement) to ensure that it does not bend when it absorbs energy and crushes. The rear part adopts the second structural reinforcement arrangement (such as the "six-petal plum blossom" shaped structural reinforcement) to transmit collision energy in multiple directions.

[0071] Furthermore, the left sill beam 521 and the right sill beam 522 adopt a double-cavity arrangement with an "E"-shaped cross-section and the opening direction facing downwards, see [reference]. Figure 4 Taking the left door sill beam 521 as an example, the left door sill beam 521 includes: an inner sill beam 5221, longitudinal ribs 5222, an outer sill beam 5223, and an upper sill beam 5226; to meet the requirements of battery sealing and door opening sealing strip installation, a battery sealing plate 5224 and a door opening stop plate 5225 are designed. Further details can be found in the documentation. Figure 2 The left sill beam 521 and the right sill beam are equipped with a third structural reinforcement (such as a "six-petal plum blossom" shaped structure) to simultaneously transmit energy to resist frontal and side collisions.

[0072] Further, see Figure 2 The left rear longitudinal beam 531 and the right rear longitudinal beam 532 also adopt a double cavity arrangement with an "E" shaped cross section and the opening direction facing downward. The left rear longitudinal beam 531 and the right rear longitudinal beam 532 are equipped with a sixth structural reinforcement (such as a "fishbone" shaped structural reinforcement).

[0073] Furthermore, the cross sections of the first crossbeam 513, the second crossbeam 533, the third crossbeam 534, and the fourth crossbeam 535 all adopt a single-cavity arrangement, see [reference]. Figure 5 The cross-section is U-shaped with the opening facing downwards, and it is composed of a first structural plate 5351, a second structural plate 5352, and a floor 5353.

[0074] The first crossbeam 513 is equipped with a fourth structural reinforcement (such as a "six-petal plum blossom" arrangement), and the second crossbeam 533, the third crossbeam 534, and the fourth crossbeam 535 are equipped with a fifth structural reinforcement (such as a "W" shaped structural reinforcement arrangement).

[0075] Furthermore, to accommodate the installation of bottom components in the area where the underframe opening faces downwards, see [reference needed]. Figure 2 For example, the rear subframe and battery mounting points need to be locally equipped with boss mounting structures. These mounting structures should be designed as far as possible at the intersection of the ribs to meet the rigidity requirements of the mounting points.

[0076] For details, see Figure 6 To improve the stiffness performance of the front wheel arch beam system in collisions and at the front shock absorber mounting points, a ring-shaped structure is formed. Specifically, it consists of structural ribs from the front wheel arch crossbeam 5151, the upper front wheel arch crossbeam 5152, the left A-pillar 517, the right A-pillar 518, the left front longitudinal beam 511, and the right front longitudinal beam 512. This ring-shaped structure has an outward-facing opening, and the interior of the cavity contains "W"-shaped diagonal bracing. Furthermore, to enhance the overall rigidity of the front wheel arch, a "fishing net"-shaped reinforcing rib structure is installed on the front wheel arch.

[0077] For details, see Figure 1 , Figure 2 The left rear wheel cover 537 and the right rear wheel cover 538 integrate the inner and outer panels of the rear wheel cover into a "hemispherical" shape with the opening facing downwards. They are also reinforced with "fishing net"-shaped ribs to ensure overall rigidity.

[0078] Further, see Figure 1 , Figure 2 For the large, thin-panel areas of the front wall panel 514, left front wheel arch 515, right front wheel arch 516, rear floor panel 536, left rear wheel arch 537, and right rear wheel arch 538, a material thickness of 2.5-3.5mm is recommended; see [link / reference]. Figure 2 To improve the rigidity of the floor surface and the flow performance of molten aluminum during die casting, it is necessary to design crisscrossing structural ribs. The recommended height of these ribs is 0.5-2mm.

[0079] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A lower body component, characterized in that, The lower body component is integrally formed using an aluminum alloy die-casting process. The lower body component includes: a front engine compartment area (510), a front floor area (520), and a rear floor area (530). The forward cabin area (510) includes: a front longitudinal beam and a first transverse beam (513); The front floor area (520) includes: a door sill beam; The rear floor area (530) includes: a rear longitudinal beam, a second crossbeam (533), a third crossbeam (534), and a fourth crossbeam (535); The first crossbeam (513), the second crossbeam (533), the third crossbeam (534), the fourth crossbeam (535), the threshold beam, and the rear longitudinal beam are designed to form a large ring enclosing a small ring structure.

2. The lower body component according to claim 1, characterized in that, The cavities of the front longitudinal beam, the first crossbeam (513), the threshold beam, the rear longitudinal beam, the second crossbeam (533), the third crossbeam (534), the fourth crossbeam (535), and the rear longitudinal beam are all provided with crisscrossing structural ribs.

3. The lower body component according to claim 1, characterized in that, The front longitudinal beam has an opening on the outer side in the direction of vehicle width; The threshold beam, the first crossbeam (513), the second crossbeam (533), the third crossbeam (534), the fourth crossbeam (535), and the rear longitudinal beam all open downwards.

4. The lower body component according to claim 3, characterized in that, The front longitudinal beam includes: a lower front longitudinal beam plate (5121), an inner front longitudinal beam plate (5124), and an upper front longitudinal beam plate (5123) connected in sequence. The interior of the front longitudinal beam is divided into a double-cavity arrangement by the longitudinal reinforcement (5122) of the front longitudinal beam connected to the inner plate (5124) of the front longitudinal beam and arranged along the length direction of the front longitudinal beam.

5. The lower body component according to claim 3, characterized in that, The threshold beam includes: a threshold beam upper plate (5226); The inner sill plate (5221) and outer sill plate (5223) are connected to the lower surface of the upper sill plate (5226). Battery sealing plate (5224) connected to the inner plate (5221) of the threshold beam; Door opening stop plate (5225) connected to the upper plate (5226) and outer plate (5223) of the threshold beam; The interior of the threshold beam is divided into a double-cavity arrangement by the longitudinal ribs (5222) of the threshold beam that are connected to the upper plate (5226) of the threshold beam and arranged along the length of the threshold beam.

6. The lower body assembly according to claim 1, characterized in that, The first crossbeam (513), the second crossbeam (533), the third crossbeam (534) and the fourth crossbeam (535) each include: a floor (5353) and a first structural plate (5351) and a second structural plate (5352) connected to the lower surface of the floor (5353).

7. The lower body component according to claim 1, characterized in that, The front longitudinal beam has a first structural rib in the front section facing the front of the vehicle, and a second structural rib in the rear section facing the rear of the vehicle. The threshold beam is equipped with a third structural reinforcement; The first crossbeam (513) is provided with a fourth structural reinforcement; The second crossbeam (533), the third crossbeam (534) and the fourth crossbeam (535) are provided with fifth structural reinforcement bars; The rear longitudinal beam is equipped with a sixth structural reinforcement.

8. The lower body assembly according to claim 1, characterized in that, The front engine compartment area also includes: front wheel arches, A-pillars, and front bulkheads; the front wheel arches include: front wheel arch crossbeams (5151) and upper wheel arch crossbeams (5152). The A-pillar, the front longitudinal beam, the front wheel arch crossbeam (5151), and the front wheel arch upper crossbeam (5152) together form an outward-facing ring structure.

9. The lower body assembly according to claim 8, characterized in that, The rear floor area also includes: a rear wheel cover and a rear floor panel; the rear wheel cover includes: an inner rear wheel cover panel and an outer rear wheel cover panel, the inner rear wheel cover panel and the outer rear wheel cover panel together forming a downward-opening hemispherical structure.

10. A vehicle, characterized in that, Includes the lower body assembly as described in any one of claims 1-9.

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