Vehicle rear floor assembly and vehicle

Abstract

The utility model relates to vehicle manufacturing technical field, concretely provides a kind of vehicle rear floor assembly and vehicle, to solve the problem that when existing vehicle is high-speed rear-end collision, rear floor assembly cannot reasonably absorb and disperse impact force, leading to impact force transmission to passenger cabin inside.For this purpose, the utility model's vehicle rear floor assembly includes rear floor and rear longitudinal beam, rear longitudinal beam is arranged at the both sides of rear floor, rear longitudinal beam includes rear longitudinal beam front section and rear longitudinal beam rear section, rear longitudinal beam rear section has from front to rear obliquely downward trend, to form target fracture zone at the connecting place of rear longitudinal beam front section and rear longitudinal beam rear section, so that when rear floor is subjected to horizontal forward load, rear longitudinal beam front section and rear longitudinal beam rear section can be fractured in target fracture zone.When vehicle is high-speed rear-end collision, horizontal load received by vehicle rear floor is transmitted to rear longitudinal beam, rear longitudinal beam front section and rear longitudinal beam rear section will be fractured in the target fracture zone of connecting place, avoid impact force further transmission to passenger cabin.

Description

Technical Field

[0001] This utility model relates to the field of vehicle manufacturing technology, specifically providing a vehicle rear floor assembly and a vehicle. Background Technology

[0002] In the field of passive safety, both mandatory regulations and NCAP (New Car Assessment Program) have clear speed requirements for each collision scenario. Most automakers design their vehicles according to the speed requirements of the regulations when designing for safety. Therefore, when a vehicle is rear-ended at a speed lower than the speed required by the regulations, the rear bumper beam, rear longitudinal beam and rear cross beam of most vehicles on the market can provide sufficient impact resistance, thereby ensuring that the rear of the vehicle does not suffer serious deformation.

[0003] However, when a vehicle is rear-ended, if the collision exceeds the legally required speed, the excessive strength of the rear bumper beam, rear longitudinal beams, and rear crossbeams results in poor energy absorption and cushioning. The impact energy can be transferred from the rear bumper beam to the rear longitudinal beams, rear crossbeams, and rear floor, or even directly into the passenger compartment, injuring the occupants. Therefore, how to rationally design the structure of the vehicle's rear floor assembly to absorb and disperse the impact force as much as possible during a high-speed rear-end collision, and to prevent the impact force from being transferred into the passenger compartment, has become a pressing technical problem to be solved in this field.

[0004] In view of this, there is a need in the art to propose a new vehicle rear floor assembly and vehicle to solve the existing problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that when a vehicle is rear-ended at high speed, the rear floor assembly cannot properly absorb and disperse the impact force, resulting in the impact force being transmitted to the passenger compartment.

[0006] In a first aspect, the present invention provides a vehicle rear floor assembly, the rear floor assembly including a rear floor and a rear longitudinal beam, the rear longitudinal beam being arranged on both sides of the rear floor, the rear longitudinal beam including a front section and a rear section, the rear section of the rear longitudinal beam having a downward inclined direction from front to rear to form a target fracture zone at the connection between the front section and the rear section of the rear longitudinal beam, such that when the rear floor is subjected to a horizontal forward load, the front section and the rear section of the rear longitudinal beam can fracture in the target fracture zone.

[0007] In a specific embodiment of the aforementioned vehicle rear floor assembly, the vertical cross-section of the front section of the rear longitudinal beam gradually decreases from front to rear, and reaches its minimum at the connection between the front section and the rear section of the rear longitudinal beam.

[0008] In a specific embodiment of the aforementioned vehicle rear floor assembly, the vertical cross-section of the rear section of the rear longitudinal beam gradually decreases along the direction from rear to front, and reaches its minimum at the connection between the front section of the rear longitudinal beam and the rear section of the rear longitudinal beam.

[0009] In a specific embodiment of the aforementioned vehicle rear floor assembly, the downward inclined direction of the rear section of the rear longitudinal beam clamps the horizontal direction to form a predetermined angle, and the predetermined angle is 24°.

[0010] In a specific embodiment of the above-mentioned vehicle rear floor assembly, a spring seat mounting hole is provided on the front section of the rear longitudinal beam, and the target fracture zone is located after the spring seat mounting hole.

[0011] In a specific embodiment of the above-described vehicle rear floor assembly, the rear floor assembly further includes a rear crossbeam located between the two rear longitudinal beams and opposite to the rear floor.

[0012] In a specific embodiment of the aforementioned vehicle rear floor assembly, the rear floor, the rear longitudinal beam, and the rear cross beam are an integral cast aluminum structure.

[0013] In a specific embodiment of the above-mentioned vehicle rear floor assembly, a first reinforcing rib and a second reinforcing rib are provided on the rear section of the rear longitudinal beam. The first reinforcing rib has an upward inclined direction from front to back, and the second reinforcing rib is arranged in a vertical direction. The first reinforcing rib and / or the second reinforcing rib form a triangular structure.

[0014] In a specific embodiment of the aforementioned vehicle rear floor assembly, a third reinforcing rib and a fourth reinforcing rib are provided on the front section of the rear longitudinal beam. The third reinforcing rib and the fourth reinforcing rib are respectively arranged along the vertical direction and the inclined direction to form a triangular structure.

[0015] This utility model also provides a vehicle, which includes the vehicle rear floor assembly described in any of the above technical solutions.

[0016] By employing the above technical solution, the rear longitudinal beam of the vehicle rear floor assembly of this utility model has a downward sloping direction from front to rear, thus forming a target fracture zone at the connection between the front and rear sections of the rear longitudinal beam. During a high-speed rear-end collision, the rear floor is subjected to a horizontal forward load. When this horizontal load is transmitted to the rear section of the rear longitudinal beam, it is divided into a force along the direction of the rear longitudinal beam and a vertical force. The force along the direction of the rear longitudinal beam is transmitted along the rear section to the front section, while the vertical force causes the rear section of the rear longitudinal beam to twist and fracture at the target fracture zone. This weakens the impact force transmitted to the front section of the rear longitudinal beam, achieving the absorption and dispersion of the impact force. This solves the problem that existing rear floor assemblies cannot effectively absorb and disperse impact forces during high-speed rear-end collisions, leading to the transmission of impact forces into the passenger compartment. Attached Figure Description

[0017] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a perspective view of the vehicle rear floor assembly of this utility model;

[0019] Figure 2 This is a left view of the vehicle rear floor assembly of this utility model;

[0020] Figure 3 This is a magnified view of a portion of the rear longitudinal beam, in which... Figure 3 yes Figure 2 Point C in the text.

[0021] List of reference numerals in the attached diagram:

[0022] 1. Rear floor assembly; 11. Rear floor; 12. Rear longitudinal beam; 121. Front section of rear longitudinal beam; 1211. Third reinforcing rib; 1212. Fourth reinforcing rib; 122. Rear section of rear longitudinal beam; 1221. First reinforcing rib; 1222. Second reinforcing rib; 13. Target fracture zone; 14. Spring seat mounting hole; 15. Rear crossbeam; 16. Support point. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0024] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] First, existing vehicles are described. Most vehicles on the market have rear bumper beams, rear longitudinal beams, and rear crossbeams that provide sufficient impact strength to ensure the rear of the vehicle does not suffer severe deformation. However, when a vehicle is rear-ended, if the collision exceeds the legally required speed, the excessive strength of the rear bumper beams, rear longitudinal beams, and rear crossbeams results in poor energy absorption and cushioning. Impact energy is transferred from the rear bumper beams to the rear longitudinal beams, rear crossbeams, and rear floor, and even directly into the passenger compartment, causing injury to the passengers. Therefore, how to rationally design the structure of the vehicle's rear floor assembly to absorb and disperse impact force as much as possible during a high-speed rear-end collision, and to prevent the impact force from being transferred into the passenger compartment, has become a pressing technical problem in this field. The following implementation method is proposed to address this issue.

[0027] like Figures 1-3 As shown, to address the problem that existing vehicle rear floor assemblies 1 cannot effectively absorb and disperse impact forces when a vehicle is rear-ended at high speed, resulting in the transmission of impact forces into the passenger compartment, the present invention provides a vehicle rear floor assembly 1 comprising a rear floor 11 and a rear longitudinal beam 12. The rear longitudinal beam 12 is arranged on both sides of the rear floor 11 and includes a front section 121 and a rear section 122. The rear section 122 has a downward sloping direction from front to rear, forming a target fracture zone 13 at the connection between the front section 121 and the rear section 122. This allows the front section 121 and the rear section 122 to fracture within the target fracture zone 13 when the rear floor 11 is subjected to a horizontal forward load. The downward sloping direction of the rear section 122 forms a predetermined angle b with the horizontal direction, and the predetermined angle b is 24°.

[0028] The advantages of the above-described configuration are as follows: Because the rear longitudinal beam 122 of the vehicle rear floor assembly 1 of this invention has a downward sloping direction from front to back, a target fracture zone 13 is formed at the connection between the front longitudinal beam 121 and the rear longitudinal beam 122. When a high-speed rear-end collision occurs, the rear floor 11 is subjected to a horizontal forward load. When this horizontal load is transmitted to the rear longitudinal beam 122, it is divided into a force acting along the direction of the rear longitudinal beam 122 and a vertical force F1. The force acting along the direction of the rear longitudinal beam 122 is transmitted along the rear longitudinal beam 122 to the front longitudinal beam 121, while the vertical force F1 causes the rear longitudinal beam 122 to twist and fracture around the fulcrum 16 in the target fracture zone 13. This weakens the impact force transmitted to the front section 121 of the rear longitudinal beam, achieving the absorption and dispersion of the impact force. It solves the problem that when existing vehicles are rear-ended at high speed, the rear floor assembly 1 cannot properly absorb and disperse the impact force, resulting in the impact force being transmitted to the passenger compartment.

[0029] Furthermore, regarding the aforementioned predetermined angle b of 24°, those skilled in the art will understand that due to the existence of this predetermined angle b, the target fracture zone 13 has a lever arm L with respect to the load direction. Simultaneously, with the help of the load, there exists a bending moment M in the target fracture zone 13 that causes it to fracture. Selecting the lowest point of the target fracture zone 13 as the fulcrum 16, the bearing bending moment M of the target fracture zone 13 is calculated using section analysis software. A virtual analysis is performed according to the designed maximum speed to calculate the maximum load F. There is a relationship between the bearing bending moment M of the target fracture zone 13 and the vertical load F1, expressed as M = F1 * L, where the vertical load F1 = (tan∠a) * F. In this formula, the angle a is unknown. Substituting F1 = (tan∠a) * F into M = F1 * L yields M = (tan∠a) * F * L, where only the angle a is unknown. Therefore, the angle a that causes the target fracture zone 13 to fracture under the maximum load F can be determined. Since angle a is the same as the preset angle b, the preset angle b can be set to 24°. This means that under the maximum load F, when the preset angle b of the rear longitudinal beam 122 tilts downwards is greater than or equal to 24°, the bending moment of the maximum load F at the connection between the front and rear longitudinal beam sections 121 and 122 exceeds its bearing bending moment M, thus causing fracture in the target fracture zone 13. When the load is less than the maximum load F, the bending moment of the load at the connection between the front and rear longitudinal beam sections 121 and 122 does not exceed its bearing bending moment M, thus preventing fracture at the connection between the front and rear longitudinal beam sections 121 and 122. This ensures that the rear floor assembly 1 provides sufficient impact strength without crumpling during low-speed rear-end collisions. Furthermore, different breaking moments can be obtained by adjusting the size of the predetermined angle b. Therefore, those skilled in the art can adjust the size of the predetermined angle b according to the design requirements of the vehicle rear floor assembly 1, thereby adjusting the collision strength of the vehicle rear floor assembly 1. These changes do not exceed the technical principles of this utility model, and therefore are all included within the protection scope of this utility model.

[0030] Furthermore, such as Figures 1-3 As shown, in one possible embodiment, the vertical cross-section of the front section 121 of the rear longitudinal beam gradually decreases from front to back, and reaches its minimum at the connection between the front section 121 and the rear section 122 of the rear longitudinal beam. The vertical cross-section of the rear section 122 of the rear longitudinal beam gradually decreases from back to front, and reaches its minimum at the connection between the front section 121 and the rear section 122 of the rear longitudinal beam.

[0031] The advantage of the above arrangement is that by gradually reducing the vertical cross-section of the front section 121 of the rear longitudinal beam from front to back, and minimizing it at the connection between the front section 121 and the rear section 122 of the rear longitudinal beam, a stress concentration area is formed at the connection between the front section 121 and the rear section 122 of the rear longitudinal beam. This further ensures that fracture occurs in the target fracture zone 13 when the rear floor 11 is subjected to a horizontal load. Correspondingly, in this embodiment, the vertical cross-section of the rear section 122 of the rear longitudinal beam is also gradually reduced from back to front, and minimized at the connection between the front section 121 and the rear section 122 of the rear longitudinal beam. This also creates a stress concentration area at the connection between the front section 121 and the rear section 122 of the rear longitudinal beam, ensuring that both the front section 121 and the rear section 122 of the rear longitudinal beam can fracture in the target fracture zone 13. Furthermore, the above only mentions a preferred embodiment. Those skilled in the art can also choose only one of the solutions, such as gradually decreasing the vertical cross-section of the front section 121 of the rear longitudinal beam from front to back, while setting the vertical cross-section of the rear section 122 of the rear longitudinal beam to be of the same size from back to front, or gradually decreasing the vertical cross-section of the rear section 122 of the rear longitudinal beam from back to front, while setting the vertical cross-section of the front section 121 of the rear longitudinal beam to be of the same size from front to back. Both of these embodiments can also achieve the formation of the target fracture zone 13 at the connection between the front section 121 and the rear section 122 of the rear longitudinal beam. Moreover, both of these embodiments do not exceed the technical principles of this utility model, and therefore are included within the protection scope of this utility model.

[0032] Furthermore, such as Figure 2 , Figure 3 As shown, a spring seat mounting hole 14 is provided on the front section 121 of the rear longitudinal beam, and the target fracture zone 13 is located after the spring seat mounting hole 14.

[0033] The advantages of the above-described implementation are: because the cross-section of the spring seat mounting hole 14 is large and the strength is high, it can effectively prevent the deformation from being transmitted forward. Taking advantage of this, the target fracture zone 13 is set behind the spring seat mounting hole 14 and also behind the three rows of seats, which can provide better protection for the passenger compartment.

[0034] Furthermore, such as Figure 1 As shown, the rear floor assembly 1 also includes a rear crossbeam 15 located between the two rear longitudinal beams 12 and opposite to the rear floor 11. The rear floor 11, the rear longitudinal beams 12 and the rear crossbeam 15 are an integral cast aluminum structure.

[0035] The advantages of the above-described embodiment are as follows: by setting the rear floor 11, rear longitudinal beam 12, and rear cross beam 15 as an integrated structure, the structural strength of the rear floor assembly 1 is improved, thereby enhancing the protection of the passenger compartment. Furthermore, cast aluminum material possesses lightweight, high strength, and high rigidity characteristics, which, when used as the rear floor assembly 1, can significantly reduce the overall vehicle weight, decrease vehicle inertia, and improve handling performance.

[0036] Furthermore, such as Figures 1-3 As shown, a first reinforcing rib 1221 and a second reinforcing rib 1222 are provided on the rear section 122 of the rear longitudinal beam. The first reinforcing rib 1221 has an upward inclined direction from front to back, and the second reinforcing rib 1222 is arranged in a vertical direction. The first reinforcing rib 1221 and / or the second reinforcing rib 1222 form a triangular structure. A third reinforcing rib 1211 and a fourth reinforcing rib 1212 are provided on the front section 121 of the rear longitudinal beam. The third reinforcing rib 1211 and the fourth reinforcing rib 1212 are arranged in a vertical direction and an inclined direction, respectively, forming a triangular structure.

[0037] The advantages of the above-described embodiment are as follows: By providing a first reinforcing rib 1221 that slopes upwards from front to back on the rear section 122 of the rear longitudinal beam and a fourth reinforcing rib 1212 that slopes along the incline on the front section 121 of the rear longitudinal beam, a supporting force opposite to the load direction can be provided when the vehicle is rear-ended, thereby improving the structural strength of the rear section 122 of the rear longitudinal beam. Furthermore, by providing a second reinforcing rib 1222 and a third reinforcing rib 1211 vertically on the front section 121 and the rear section 122 of the rear longitudinal beam, respectively, the first reinforcing rib 1221 and the second reinforcing rib 1222, and the third reinforcing rib 1211 and the fourth reinforcing rib 1212 respectively form triangular structures, further enhancing the structural strength of the rear section 122 and the front section 121 of the rear longitudinal beam, and improving structural stability.

[0038] It should be noted that the above embodiments are only used to illustrate the principle of this utility model and are not intended to limit the scope of protection of this utility model. Without departing from the principle of this utility model, those skilled in the art can adjust the above structure so that this utility model can be applied to more specific application scenarios.

[0039] In addition, the present invention also provides a vehicle having the vehicle rear floor assembly 1 mentioned in any of the above embodiments.

[0040] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A vehicle rear floor assembly (1), characterized in that, The rear floor assembly (1) includes a rear floor (11) and a rear longitudinal beam (12), the rear longitudinal beam (12) being arranged on both sides of the rear floor (11), the rear longitudinal beam (12) including a front section (121) and a rear section (122), the rear section (122) having a downward sloping direction from front to back, so as to form a target fracture zone (13) at the connection between the front section (121) and the rear section (122), such that when the rear floor (11) is subjected to a horizontal forward load, the front section (121) and the rear section (122) of the rear longitudinal beam can fracture in the target fracture zone (13).

2. The vehicle rear floor assembly (1) according to claim 1, characterized in that, The vertical cross section of the front section (121) of the rear longitudinal beam gradually decreases from front to back, and reaches its minimum at the connection between the front section (121) and the rear section (122) of the rear longitudinal beam.

3. The vehicle rear floor assembly (1) according to claim 2, characterized in that, The vertical cross section of the rear section (122) of the rear longitudinal beam gradually decreases along the direction from back to front, and reaches its minimum at the connection between the front section (121) of the rear longitudinal beam and the rear section (122).

4. The vehicle rear floor assembly (1) according to claim 1, characterized in that, The downward tilt of the rear section (122) of the rear longitudinal beam is clamped to the horizontal direction at a predetermined angle, and the predetermined angle is 24°.

5. The vehicle rear floor assembly (1) according to claim 1, characterized in that, A spring seat mounting hole (14) is provided on the front section (121) of the rear longitudinal beam, and the target fracture zone (13) is located after the spring seat mounting hole (14).

6. The vehicle rear floor assembly (1) according to claim 1, characterized in that, The rear floor assembly (1) also includes a rear crossbeam (15) located between the two rear longitudinal beams (12) and opposite to the rear floor (11).

7. The vehicle rear floor assembly (1) according to claim 6, characterized in that, The rear floor (11), the rear longitudinal beam (12), and the rear transverse beam (15) are an integral cast aluminum structure.

8. The vehicle rear floor assembly (1) according to claim 1, characterized in that, The rear section (122) of the rear longitudinal beam is provided with a first reinforcing rib (1221) and a second reinforcing rib (1222). The first reinforcing rib (1221) has an upward inclined direction from front to back, and the second reinforcing rib (1222) is arranged in a vertical direction. The first reinforcing rib (1221) and / or the second reinforcing rib (1222) form a triangular structure.

9. The vehicle rear floor assembly (1) according to claim 1, characterized in that, The front section (121) of the rear longitudinal beam is provided with a third reinforcing rib (1211) and a fourth reinforcing rib (1212). The third reinforcing rib (1211) and the fourth reinforcing rib (1212) are respectively arranged along the vertical direction and the inclined direction to form a triangular structure.

10. A vehicle, characterized in that, The vehicle includes the vehicle rear floor assembly (1) according to any one of claims 1-9.

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