Longitudinal beam structure, longitudinal beam assembly and vehicle

Abstract

The utility model relates to a longitudinal beam structure, a longitudinal beam assembly and a vehicle, and relates to the field of vehicle longitudinal beams. The longitudinal beam structure comprises a first longitudinal beam and a second longitudinal beam, and the first longitudinal beam is provided with a swing arm mounting part used for being connected with a swing arm of the suspension system; the rear end of the second longitudinal beam is connected with the rear end of the first longitudinal beam, the front end of the second longitudinal beam is connected with the first longitudinal beam, and the second longitudinal beam is provided with a swing arm installation part. The swing arm mounting part is arranged on the longitudinal beam structure, so that the longitudinal beam structure can be directly connected with the swing arm of the suspension system, an original auxiliary frame structure used for connecting the swing arm with the longitudinal beam structure can be omitted, the space occupied by the auxiliary frame structure is saved, the weight of the whole vehicle is reduced, the gravity center of the whole vehicle can be lowered, and the service life of the whole vehicle is prolonged. The driving performance of the vehicle is improved; and due to the arrangement of the second longitudinal beam, when the longitudinal beam structure is subjected to external force such as rear-end collision force, the external force can be dispersed to the first longitudinal beam and the second longitudinal beam, so that the impact of the external force is reduced, and the safety of the vehicle after collision is improved.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle longitudinal beams, specifically to a longitudinal beam structure, a longitudinal beam assembly, and a vehicle. Background Technology

[0002] Lightweighting of automobiles is a core technology and an important development direction in the automotive industry. It refers to reducing the weight of a vehicle without compromising its safety, reliability, comfort, or cost, thereby improving its power economy.

[0003] The vehicle's suspension system plays a decisive role in the driving experience and performance. In related technologies, the suspension system is generally connected to the vehicle body through a subframe. However, since the subframe itself has a certain volume and height, its presence will also increase the overall weight of the vehicle and raise the center of gravity, thereby affecting the vehicle's driving performance. Utility Model Content

[0004] The purpose of this disclosure is to provide a longitudinal beam structure, a longitudinal beam assembly, and a vehicle, wherein the longitudinal beam structure can be connected to the control arm of the suspension system, thereby at least partially solving the aforementioned technical problems.

[0005] To achieve the above objectives, a first aspect of this disclosure provides a longitudinal beam structure, comprising: a first longitudinal beam having a swing arm mounting portion for connection with a swing arm of a suspension system; and a second longitudinal beam having a rear end connected to the rear end of the first longitudinal beam, a front end connected to the first longitudinal beam, and the second longitudinal beam having the swing arm mounting portion.

[0006] Optionally, a clearance is formed between the first longitudinal beam and the second longitudinal beam for the transmission shaft to pass through.

[0007] Optionally, the first longitudinal beam includes a first longitudinal beam segment and a second longitudinal beam segment, one end of the second longitudinal beam is connected to the rear end of the first longitudinal beam segment, and the other end is connected to the second longitudinal beam segment; the first longitudinal beam segment includes a force transmission zone and a deformable zone arranged sequentially along the extension direction of the first longitudinal beam segment.

[0008] Optionally, the first longitudinal beam segment includes a first mounting area for mounting the swing arm mounting part; the second longitudinal beam includes a second mounting area for mounting the swing arm mounting part.

[0009] Optionally, the first installation area is located within the first longitudinal beam segment; and / or, the second installation area is located within the second longitudinal beam segment.

[0010] Optionally, the first mounting area has two spaced-apart swing arm mounting portions, and the second mounting area has three spaced-apart swing arm mounting portions.

[0011] Optionally, the swing arm mounting portion includes two oppositely arranged mounting plates. Each mounting plate includes a support area, a connecting area connected to the mating area of ​​the swing arm, and a mounting hole provided on the connecting area.

[0012] Optionally, the draft angle of the support area is greater than the draft angle of the connection area.

[0013] Optionally, both the first longitudinal beam and the second longitudinal beam are provided with reinforcing ribs, the reinforcing ribs including cross ribs, V-shaped ribs and longitudinal ribs extending in the front-rear direction; the two sides of the swing arm mounting part are respectively connected to one of the cross ribs, the V-shaped ribs and the longitudinal ribs.

[0014] Optionally, the reinforcing rib near the side of the swing arm mounting portion has clearance space for mounting the swing arm.

[0015] Optionally, reinforcing ribs are provided in both the force transmission zone and the deformable zone. The reinforcing ribs include a first reinforcing rib provided in the force transmission zone and a second reinforcing rib provided in the deformable zone. The first reinforcing rib is a longitudinal rib extending in the front-back direction. And / or, the second reinforcing rib is a cross rib.

[0016] A second aspect of this disclosure provides a longitudinal beam assembly, including a crossbeam structure and the aforementioned longitudinal beam structure, wherein two longitudinal beam structures are provided, the two longitudinal beam structures are spaced apart in the left-right direction and connected by a plurality of crossbeam structures, and the crossbeam structures are spaced apart in the front-back direction.

[0017] Optionally, the longitudinal beam assembly is integrally cast.

[0018] A third aspect of this disclosure provides a vehicle including the aforementioned longitudinal beam assembly.

[0019] Through the above technical solution, the longitudinal beam structure of this disclosure is provided with a swing arm mounting part, which allows it to be directly connected to the swing arm of the suspension system. As a result, the subframe structure originally used to connect the swing arm to the longitudinal beam structure can be eliminated, saving the space occupied by the subframe structure, thereby reducing the weight of the whole vehicle and lowering the center of gravity of the whole vehicle, improving the driving performance of the vehicle. In addition, the setting of the second longitudinal beam can also distribute the external force, such as the rear-end collision force, to the first and second longitudinal beams when the longitudinal beam structure is subjected to external force, thereby reducing the impact of the external force and improving the safety of the vehicle after a collision.

[0020] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram showing the positional relationship between the longitudinal beam structure, subframe structure, and drive shaft in related technologies;

[0023] Figure 2 This is a schematic diagram showing the positional relationship between the longitudinal beam structure, the subframe structure, and the drive shaft according to an embodiment of this disclosure;

[0024] Figure 3 This is a schematic diagram of the structure of a longitudinal beam assembly provided in one embodiment of the present disclosure;

[0025] Figure 4 This is a first-angle bottom view of a longitudinal beam assembly provided in one embodiment of this disclosure;

[0026] Figure 5 This is a second-angle bottom view of a longitudinal beam assembly provided in one embodiment of this disclosure;

[0027] Figure 6 This is a side view of a longitudinal beam assembly provided in one embodiment of this disclosure;

[0028] Figure 7 This is a partially enlarged first-angle schematic diagram of the connection relationship between the swing arm mounting part and the reinforcing rib provided in an embodiment of this disclosure;

[0029] Figure 8 This is a second-angle enlarged schematic diagram of the connection relationship between the swing arm mounting part and the reinforcing rib provided in an embodiment of this disclosure;

[0030] Figure 9 This is a schematic diagram of the lateral space between longitudinal beam assemblies in related technologies and the lateral space of a longitudinal beam assembly provided in an embodiment of this disclosure.

[0031] Explanation of reference numerals in the attached figures

[0032] 1-First longitudinal beam; 11-First longitudinal beam segment; 111-First mounting area; 12-Second longitudinal beam segment; 2-Second longitudinal beam; 21-Second mounting area; 3-Swing arm mounting part; 31-Mounting plate; 311-Support area; 312-Connection area; 313-Mounting hole; 4-Allowing opening; 5-Force transmission area; 6-Deformable area; 7-Reinforcing rib; 71-First reinforcing rib; 72-Second reinforcing rib; 8-Allowing space; 9-Crossbeam structure; 100-Subframe structure; 200-Drive shaft; 300-Non-deformable area. Detailed Implementation

[0033] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0034] In this disclosure, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use. Specifically, "up" and "down" can be referred to as... Figure 1 , Figure 2 as well as Figure 6 The directions shown in the diagram, "left" and "right", can be used as a reference. Figure 9 The directions shown in the drawings are as follows: "front" and "rear" generally refer to the "front" and "rear" of the vehicle in normal driving condition after the corresponding component is connected to the whole vehicle; "inner" and "outer" refer to the "inner" and "outer" relative to the outline of the corresponding component itself. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In addition, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0035] In related technologies, such as Figure 1 As shown, the control arms of the vehicle's suspension system are generally connected to the vehicle's longitudinal beam structure through a subframe structure 100. The longitudinal beam structure, subframe structure 100, and drive shaft 200 are arranged sequentially from top to bottom in the vehicle's height direction. Since the subframe structure 100 itself has a certain volume and weight, the subframe structure 100 located between the longitudinal beam structure and the drive shaft 200 will occupy a certain amount of space, thereby increasing the weight of the entire vehicle and making the center of gravity of the entire vehicle higher, which affects the vehicle's driving performance.

[0036] The longitudinal beam structure and longitudinal beam assembly in the exemplary embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0037] refer to Figures 2 to 9As shown, in a first aspect, this disclosure provides a longitudinal beam structure that can be disposed at the rear of a vehicle, including a first longitudinal beam 1 and a second longitudinal beam 2. The first longitudinal beam 1 may have a swing arm mounting portion 3 for connection with the swing arm of a suspension system. The rear end of the second longitudinal beam 2 is connected to the rear end of the first longitudinal beam 1, and the front end of the second longitudinal beam 2 is connected to the first longitudinal beam 1, and the second longitudinal beam 2 also has the swing arm mounting portion 3. That is, the first longitudinal beam 1 can be connected to the upper swing arm of the suspension system, and the second longitudinal beam 2 is located below the first longitudinal beam 1 and can be connected to the lower swing arm of the suspension system. Therefore, the longitudinal beam structure of this disclosure can be directly connected to the swing arm of the suspension system without the need for a subframe structure 100. Thus, the position of the longitudinal beam structure can be moved downwards so that at least part of the longitudinal beam structure can be located at the original subframe mounting position, thereby reducing the overall vehicle weight and lowering the vehicle's center of gravity, improving the vehicle's driving performance. In addition, since the rear end of the second longitudinal beam 2 is connected to the rear end of the first longitudinal beam 1, when the vehicle is subjected to an external force from the rear, such as a rear-end collision force, the two longitudinal beams can disperse the external force, thereby reducing the impact of the external force and improving the safety of the vehicle after a collision.

[0038] Specifically, the installation position of the longitudinal beam structure disclosed herein can be lowered by more than 80mm compared with the installation position of the longitudinal beam structure in related technologies. In addition to lowering the center of gravity of the vehicle, it can also increase the space of the luggage compartment.

[0039] In embodiments of this disclosure, such as Figure 3 , Figure 4 as well as Figure 6 As shown, a clearance opening 4 for the drive shaft 200 to pass through can be formed between the first longitudinal beam 1 and the second longitudinal beam 2. This arrangement does not change the original installation position of the drive shaft 200, allowing the longitudinal beam structure of this disclosure to reduce the overall vehicle weight and lower the center of gravity while minimizing impact on the installation of other structures on the vehicle. Furthermore, since the longitudinal beam structure of this disclosure also includes the second longitudinal beam 2, the volume of the longitudinal beam structure is increased compared to longitudinal beam structures in related technologies. This, to a certain extent, increases the strength of the longitudinal beam structure. Therefore, while meeting strength requirements, the width of the longitudinal beam structure can also be reduced to a certain extent. For example, as shown... Figure 9 As shown, the first longitudinal beam 1 and / or the second longitudinal beam 2 can be reduced by 28mm. Correspondingly, the lateral space of the longitudinal beam assembly, that is, the space between the two longitudinal beam structures spaced apart in the left-right direction, can be increased, thereby making the arrangement of each component more flexible. Figure 9 The dashed line represents the width boundary of the longitudinal beam structure in the related art, while the solid line represents the width of the longitudinal beam structure in this disclosure.

[0040] In some implementations, such as Figures 3 to 6As shown, the first longitudinal beam 1 may include a first longitudinal beam segment 11 and a second longitudinal beam segment 12. One end of the second longitudinal beam 12 is connected to the rear end of the first longitudinal beam segment 11, and the other end is connected to the second longitudinal beam segment 12. The first longitudinal beam segment 11 includes a force transmission zone 5 and a deformable zone 6 arranged sequentially along the extension direction of the first longitudinal beam segment 11. When the vehicle is subjected to external force, part of the external force will be transmitted to the second longitudinal beam segment 12, thereby reducing the impact of the external force to a certain extent. The other part of the external force on the first longitudinal beam segment 11 will be transmitted to the deformable zone 6 by the force transmission zone 5. The deformable zone 6 can collapse and deform after being subjected to external force, thereby absorbing the external force and preventing the external force from causing injury to the passengers in the vehicle, thus improving the safety performance of the vehicle.

[0041] In addition, such as Figures 3 to 5 As shown, the first longitudinal beam segment 11 may further include a first mounting area 111 for mounting the swing arm mounting part 3; the second longitudinal beam 2 may include a second mounting area 21 for mounting the swing arm mounting part 3. By concentrating all the connection areas of the swing arms connecting the suspension system onto a single component, i.e., all the mounting positions of the swing arms are located on the longitudinal beam structure, the installation of the suspension system can be facilitated. Furthermore, the specific positions of the first mounting area 111 and the second mounting area 21 can be adaptively adjusted according to the installation position of the longitudinal beam structure. For example, the first mounting area 111 may be located on the side of the first longitudinal beam segment 11 to connect with the upper swing arm of the suspension system, while the second mounting area 21 may be located on the bottom surface of the second longitudinal beam 2 to connect with the lower swing arm of the suspension system. Specifically, connecting plates may be provided on the side of the first longitudinal beam segment 11 and the bottom surface of the second longitudinal beam 2. The connecting plates are used to connect with the swing arms of the suspension system. On the connecting plates, one swing arm mounting part 3 or multiple swing arm mounting parts 3 may be provided at intervals.

[0042] Or, such as Figure 3 and Figure 4 As shown, the first mounting area 111 is located within the first longitudinal beam segment 11; and / or, the second mounting area 21 is located within the second longitudinal beam segment 12. By placing the mounting area for the swing arm used to connect the suspension system within the longitudinal beam structure, the connection strength between the swing arm mounting part 3 and the longitudinal beam structure can be further improved. In this case, openings can be provided on the outer side of the first longitudinal beam segment 11 and at the bottom of the second longitudinal beam 2 to facilitate the connection of the swing arm with the swing arm mounting part 3 located within the first longitudinal beam segment 11 and the second longitudinal beam segment 12.

[0043] Furthermore, the first mounting area 111 may have two spaced-apart swing arm mounting portions 3, and the second mounting area 21 may have three spaced-apart swing arm mounting portions 3. That is, there are a total of five swing arm mounting portions 3 in the first mounting area 111 and the second mounting area 21. This suspension has a five-swing arm structure, thereby improving the stability of the vehicle during driving.

[0044] In embodiments of this disclosure, such as Figure 7 and Figure 8 As shown, the swing arm mounting part 3 may include two opposing mounting plates 31. The mounting plate 31 includes a support area 311, a connecting area 312 connected to the mating area of ​​the swing arm, and a mounting hole 313 provided on the connecting area 312. The mounting plate 31 can be connected to the first longitudinal beam segment 11 or the second longitudinal beam segment 12 through the support area 311. For example, the connecting area 312 of the swing arm mounting part 3 located on the first mounting area 111 in the first longitudinal beam segment 11 can be connected to the upper and lower ends of the first longitudinal beam segment 11, while the connecting area 312 of the swing arm mounting part 3 located on the second mounting area 21 in the second longitudinal beam 2 can be connected to the left and right ends of the second longitudinal beam 2, thereby ensuring the stability of the swing arm mounting part 3 after being connected to the longitudinal beam structure. The area between the two mounting plates 31 forms an installation space for the mating area of ​​the swing arm to be inserted. After the mating area of ​​the swing arm is inserted into the installation space, it can be connected to the mounting hole 313 located on the connecting area 312 through a connecting member such as a pin, so that the swing arm can swing relative to the swing arm mounting part 3.

[0045] Among them, such as Figure 7 and Figure 8 As shown, the draft angle of the support area 311 can be greater than that of the connection area 312. A larger draft angle for the support area 311 ensures its own strength, thereby guaranteeing the stability of the swing arm mounting part 3 after connection with the longitudinal beam structure. Since the connection area 312 needs to maintain high precision while ensuring its own strength, its draft angle is relatively smaller, thus making it closer to its actual assembly state and minimizing machining. Specifically, the draft angle of the support area 311 can be 1.5°, and the draft angle of the connection area 312 can be 0.5°.

[0046] In some implementations, such as Figures 3 to 8 As shown, both the first longitudinal beam 1 and the second longitudinal beam 2 are provided with reinforcing ribs 7. The reinforcing ribs 7 may include cross ribs, V-shaped ribs, and longitudinal ribs extending in the front-rear direction. The two sides of the swing arm mounting part 3 are respectively connected to one of the cross ribs, V-shaped ribs, and longitudinal ribs. The setting of reinforcing ribs 7 can improve the strength of the longitudinal beam structure. Among them, the longitudinal ribs can improve the transmission effect of external forces on the longitudinal beam structure, while the cross ribs and / or V-shaped ribs can collapse and absorb energy when external forces impact the longitudinal ribs, thereby reducing the impact of external forces.

[0047] In order to facilitate the installation of the suspension system's swing arm with the swing arm mounting part 3 located in the first longitudinal beam segment 11 and the second longitudinal beam 2, such as Figure 7 and Figure 8As shown, the reinforcing rib 7 near the swing arm mounting part 3 can have a clearance space 8. Taking the swing arm mounting part 3 set in the first longitudinal beam section 11 as an example, there can be two swing arm mounting parts 3, which are spaced apart in the first longitudinal beam section 11. The outer side of the mounting plate 31 can be provided with cross ribs, V-shaped ribs, or longitudinal ribs. When the outer side of the mounting plate 31 is a longitudinal rib, the longitudinal rib can be connected to the support area 311 of the mounting plate 31. In this way, when the mating area of ​​the swing arm is connected to the connection area 312 of the swing arm mounting part 3, there is enough space on the outer side of the connection area 312 to facilitate the workers to connect the two together. This space forms the clearance space 8 mentioned above. When the outer side of the mounting plate 31 is a cross rib or a V-shaped rib, the length of the side of the reinforcing rib 7 near the mounting plate 31 in the left-right direction is greater than the length of the area of ​​the reinforcing rib 7 away from the mounting plate 31 in the left-right direction, so that the outer side of the mounting plate 31 can form an arc-shaped clearance space 8, thereby facilitating the connection between the swing arm and the swing arm mounting part 3.

[0048] In addition, it should be noted that although changing the setting method and connection position of the stiffener 7 will reduce the length of the stiffener 7 in the left and right directions, the reduction in force transmission effect and the decrease in the overall strength of the longitudinal beam structure can be compensated by increasing the thickness of this part of the stiffener 7.

[0049] In some embodiments of this disclosure, such as Figures 3 to 6 As shown, both the force transmission zone 5 and the deformable zone 6 can be provided with reinforcing ribs 7. The reinforcing ribs 7 can include a first reinforcing rib 71 in the force transmission zone 5 and a second reinforcing rib 72 in the deformable zone 6. The first reinforcing rib 71 can be constructed as a longitudinal rib extending in the front-rear direction; and / or, the second reinforcing rib 72 can be constructed as a cross rib. The force transmission zone 5 is located at the rear end of the first longitudinal beam segment 11 and can transmit external forces to the deformable zone 6. Because the second reinforcing rib 72 in the deformable zone 6 can be constructed as a cross rib, it can collapse and absorb energy after being subjected to a certain degree of external force, thereby reducing the impact of the external force and improving vehicle driving safety.

[0050] Among them, the first longitudinal beam segment 11 is provided with a force transmission facade on the side near the rear end. The force transmission facade is connected to the longitudinal reinforcement and the second longitudinal beam 2, so that the external force transmitted from the rear end of the longitudinal beam structure can be better transmitted to the force transmission zone 5 and the second longitudinal beam 2 through the force transmission facade.

[0051] Additionally, it should be noted that the second longitudinal beam segment 12 may include a non-deformable zone 300 to ensure passenger safety. Specifically, reinforcing ribs 7 may be provided within the non-deformable zone 300. The density of the reinforcing ribs 7 in the non-deformable zone 300 may be greater than the density of the reinforcing ribs 7 in the first longitudinal beam segment 11 and the second longitudinal beam 2, thereby improving the structural strength of the second longitudinal beam segment 12 and reducing or even preventing its deformation under external forces, thus ensuring passenger safety. The reinforcing ribs 7 within the non-deformable zone 300 may be constructed as cross ribs and / or V-shaped ribs.

[0052] A second aspect of this disclosure provides a longitudinal beam assembly, including a crossbeam structure 9 and the aforementioned longitudinal beam structure. Two longitudinal beam structures may be provided, spaced apart in the left-right direction and connected by multiple crossbeam structures 9. The crossbeam structures 9 are spaced apart in the front-back direction. It should be noted that this longitudinal beam assembly possesses all the beneficial effects of the aforementioned longitudinal beam structure, which will not be elaborated upon further in this disclosure.

[0053] The longitudinal beam assembly disclosed herein can be integrally cast. Specifically, the longitudinal beam assembly can be an integral die-cast aluminum alloy structure, which can shorten the dimensional chain, reduce the conversion of positioning reference, and ensure the installation accuracy of the swing arm and the swing arm mounting part 3.

[0054] A third aspect of this disclosure provides a vehicle including the aforementioned longitudinal beam assembly. It should be noted that this vehicle possesses all the beneficial effects of the aforementioned longitudinal beam assembly, which will not be elaborated upon here.

[0055] In summary, this disclosure exemplarily illustrates the working principle of the longitudinal beam structure and the longitudinal beam assembly.

[0056] The first longitudinal beam segment 11 on the first longitudinal beam 1 can be connected to the upper control arm of the suspension system via the control arm mounting part 3, and the second longitudinal beam 2 can be connected to the lower control arm of the suspension system via the control arm mounting part 3. Therefore, the connection between the longitudinal beam structure and the suspension system can be achieved without the need for a subframe structure 100. This saves space occupied by the subframe structure 100, thereby reducing the overall vehicle weight and lowering the vehicle's center of gravity, improving driving performance. When the rear end of the longitudinal beam structure is subjected to an external force, such as a rear-end collision force, the first longitudinal beam 1 and the second longitudinal beam 2 can respectively transmit a certain amount of external force to reduce the impact. Furthermore, after the longitudinal ribs in the force transmission zone 5 transmit the external force to the deformable zone 6, the cross ribs in the deformable zone 6 can collapse and absorb energy, further reducing the impact of the external force and improving the vehicle's stability in the event of a collision, such as a rear-end collision.

[0057] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0059] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A longitudinal beam structure, characterized in that, include: The first longitudinal beam has a swing arm mounting portion for connecting with the swing arm of the suspension system; The second longitudinal beam has its rear end connected to the rear end of the first longitudinal beam, its front end connected to the first longitudinal beam, and the second longitudinal beam has the swing arm mounting portion.

2. The longitudinal beam structure according to claim 1, characterized in that, A clearance is formed between the first longitudinal beam and the second longitudinal beam for the transmission shaft to pass through.

3. The longitudinal beam structure according to claim 1, characterized in that, The first longitudinal beam includes a first longitudinal beam segment and a second longitudinal beam segment. One end of the second longitudinal beam is connected to the rear end of the first longitudinal beam segment, and the other end is connected to the second longitudinal beam segment. The first longitudinal beam segment includes a force transmission zone and a deformable zone arranged sequentially along the extension direction of the first longitudinal beam segment.

4. The longitudinal beam structure according to claim 3, characterized in that, The first longitudinal beam segment includes a first mounting area for mounting the swing arm mounting part; the second longitudinal beam includes a second mounting area for mounting the swing arm mounting part.

5. The longitudinal beam structure according to claim 4, characterized in that, The first installation area is located within the first longitudinal beam segment; and / or, The second installation area is located within the second longitudinal beam segment.

6. The longitudinal beam structure according to claim 5, characterized in that, The first mounting area has two spaced-apart swing arm mounting parts, and the second mounting area has three spaced-apart swing arm mounting parts.

7. The longitudinal beam structure according to any one of claims 1-6, characterized in that, The swing arm mounting part includes two oppositely arranged mounting plates. Each mounting plate includes a support area, a connecting area connected to the mating area of ​​the swing arm, and a mounting hole provided on the connecting area.

8. The longitudinal beam structure according to claim 7, characterized in that, The draft angle of the support area is greater than that of the connection area.

9. The longitudinal beam structure according to claim 5, characterized in that, Both the first longitudinal beam and the second longitudinal beam are provided with reinforcing ribs, which include cross ribs, V-shaped ribs and longitudinal ribs extending in the front-back direction; The two sides of the swing arm mounting part are respectively connected to one of the cross rib, the V-shaped rib, and the longitudinal rib.

10. The longitudinal beam structure according to claim 9, characterized in that, The reinforcing rib near the side of the swing arm mounting portion has clearance space for mounting the swing arm.

11. The longitudinal beam structure according to claim 3, characterized in that, Both the force transmission zone and the deformable zone are provided with reinforcing ribs, and the reinforcing ribs include a first reinforcing rib provided in the force transmission zone and a second reinforcing rib provided in the deformable zone; Wherein, the first reinforcing rib is a longitudinal rib extending in the front-rear direction; and / or, The second reinforcing bar is a cross bar.

12. A longitudinal beam assembly, characterized in that, The invention includes a crossbeam structure and a longitudinal beam structure as described in any one of claims 1-11, wherein two longitudinal beam structures are provided, the two longitudinal beam structures are spaced apart in the left-right direction and connected by a plurality of crossbeam structures, and the crossbeam structures are spaced apart in the front-back direction.

13. The longitudinal beam assembly according to claim 12, characterized in that, The longitudinal beam assembly is integrally cast.

14. A vehicle, characterized in that, Includes the longitudinal beam assembly as described in claim 12 or 13.

Images