Vehicle body front cabin upper longitudinal beam structure and connecting structure thereof

Abstract

The invention discloses a vehicle body front cabin upper longitudinal beam structure and a connecting structure thereof, the vehicle body front cabin upper longitudinal beam structure comprises a cavity structure with a rectangular cross section inside, and the front part and the rear part of the cavity structure are respectively provided with a front lap joint part used for being fixedly connected with a vehicle body front end frame and a rear lap joint part used for being in lap joint and fixed with a vehicle body A column; the cavity structure comprises an avoiding structure used for avoiding tires and headlamps and a hinge installation support capable of being connected with the hood in a hinged mode through a hinge. A cavity structure with a rectangular cross section is arranged in the longitudinal beam, and the bending resistance and torsion resistance of the longitudinal beam can be effectively improved through the structural design. When a vehicle is collided or bears complex external force, the rectangular cavity can uniformly disperse stress, and structural damage caused by stress concentration is avoided, so that reliable support is provided for the front end of the vehicle body, the stability and safety of the whole structure of the vehicle body are guaranteed, and extrusion of collision deformation on living space of passengers in the vehicle is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile structures, and in particular to an upper longitudinal beam structure of a front engine compartment of a vehicle body and a connection structure thereof. Background Art

[0002] The front cabin of the vehicle body is an extremely complex and critical area, in which the upper longitudinal beam plays an important role. The front cabin not only has to house many complex functional modules such as the vehicle power system, cooling system, chassis system, air conditioning system, etc., but also bears mandatory regulatory requirements such as collision safety and pedestrian protection, and its dynamic stiffness, modal and durability performance have a profound impact on the quality of the vehicle. As the core components of this area, the hood system and the upper longitudinal beam of the front cabin are of great significance to the performance improvement of the vehicle. In forward development, the hood hinge can be arranged above the large surface of the upper longitudinal beam of the front cabin, which has many structural and cost advantages.

[0003] The existing upper longitudinal beam of the front engine compartment of the vehicle body is usually made of high-strength steel. Its structural shape is mostly long strips with a certain cross-sectional shape design to meet the strength and functional requirements. It is closely connected to the front bumper crossbeam, headlight frame and other components through welding, bolting and other methods. Its main purpose is to provide a stable installation foundation and support structure for various systems in the front engine compartment. When the vehicle collides, it can effectively transmit and disperse the collision energy, protect the safety of passengers in the car, and ensure that key components such as the engine are not seriously damaged. At the same time, it also provides reasonable installation points for components such as the hood hinge to ensure the smoothness and stability of the hood opening and closing.

[0004] However, the existing upper longitudinal beam structure of the front cabin of the vehicle body and its connection method also have some shortcomings. Its complex connection structure may make it difficult to control the assembly accuracy, and it is easy to have cumulative errors in the large-scale production process, affecting the assembly quality of the whole vehicle. Although the use of high-strength steel ensures strength, it also increases the weight of the vehicle body, which is not conducive to the fuel economy and handling flexibility of the vehicle. Moreover, during long-term use, the connection parts may become loose or fatigued due to factors such as vibration and corrosion, affecting the stability and safety of the structure, making later maintenance and inspection difficult and the maintenance cost high. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a vehicle body front cabin upper longitudinal beam structure and its connection structure which have simple structure, low cost, high stability and good safety.

[0006] To achieve this purpose, the vehicle body front cabin upper longitudinal beam structure designed by the present invention includes a cavity structure with a rectangular cross-section inside, and the front and rear parts of the cavity structure are respectively provided with a front overlapping portion for fixedly connected to the front end frame of the vehicle body, and a rear overlapping portion for overlapping and fixing with the A-pillar of the vehicle body; the cavity structure includes an avoidance structure for avoiding tires and headlights and a hinge mounting bracket that can be hingedly connected to the hood through a hinge.

[0007] Furthermore, the cavity structure includes an outer panel structure arranged along its length direction, and an inner panel structure arranged along its length direction; the top of the outer panel structure and the top of the inner panel structure are overlapped and fixed along the length direction of the cavity structure, and the bottom of the outer panel structure and the bottom of the inner panel structure are overlapped and fixed along the length direction of the cavity structure; the outer panel structure and the inner panel structure form the cavity structure.

[0008] Furthermore, the outer panel structure includes a plurality of outer panels fixedly connected end to end, including a front outer panel, a middle outer panel and a rear outer panel; the inner panel structure includes a plurality of inner panels fixedly connected end to end, including a front middle inner panel and a rear inner panel; the top and bottom of the front outer panel are respectively overlapped and fixed with the top and bottom of the front part of the front middle inner panel to form a front cavity structure, the top and bottom of the middle outer panel are respectively overlapped and fixed with the top and bottom of the middle and rear part of the front middle inner panel to form a middle cavity structure, and the top and bottom of the rear outer panel are respectively overlapped and fixed with the top and bottom of the rear inner panel to form a rear cavity structure; the cavity structure includes the front cavity structure, the middle cavity structure and the rear cavity structure.

[0009] Furthermore, the front end of the front cavity structure is fixedly connected to the front overlapping portion, which includes a front overlapping plate vertically fixedly connected to the front end of the front outer panel or the front end of the front middle inner panel.

[0010] Furthermore, both the inner and outer sides of the rear portion of the rear cavity structure extend rearward along the length direction of the rear cavity structure, and form a vehicle body A-pillar accommodating cavity together with the top rear end of the rear cavity structure, and the rear overlapping portion includes the extension portions on the inner and outer sides of the rear portion of the rear cavity structure and the top rear end surface of the rear cavity structure.

[0011] Furthermore, the front cavity structure includes a first avoidance structure whose bottom surface is uniformly raised upward along the length direction of the front cavity structure, the middle cavity structure includes a second avoidance structure whose middle portion of the bottom surface is arched upward and the front portion is overlapped and fixed with the rear portion of the first avoidance structure, and the rear cavity structure includes a third avoidance structure whose bottom surface is uniformly lowered downward along the length direction of the rear cavity structure and the front portion is overlapped and fixed with the rear portion of the second avoidance structure, and the avoidance structures include the first avoidance structure, the second avoidance structure and the third avoidance structure.

[0012] Furthermore, the hinge mounting bracket includes an L-shaped hinge mounting plate, the bottom surface of which is fixed to the top surface of the rear cavity structure.

[0013] Furthermore, the hinge mounting bracket also includes an L-shaped hinge fixing reinforcement plate whose bottom surface is fixed to the top surface of the rear cavity structure, and the vertical surface of the hinge fixing reinforcement plate is fitted and fixedly connected to the vertical surface of the hinge mounting plate.

[0014] Furthermore, a plurality of partition structures are arranged at intervals inside the cavity structure along its length direction, and the inner and outer side surfaces, the top surface and the bottom surface of the partition structure are overlapped and fixed to the inner surface of the cavity structure.

[0015] Furthermore, a connection structure of the longitudinal beam structure on the front cabin of the vehicle body is provided, wherein the front overlap portion of the longitudinal beam structure on the front cabin of the vehicle body is fixedly connected to the front frame column and the light panel beam of the vehicle body, the rear overlap portion is fixedly connected to the A-pillar of the vehicle body, the avoidance structure is located above the tires and the front headlights, and the hinge mounting bracket is hingedly connected to the hood through a hinge.

[0016] The beneficial effects of the present invention are as follows: the interior of the vehicle designed by the present invention has a cavity structure with a rectangular cross-section, and this structural design can effectively improve the bending and torsion resistance of the longitudinal beam. When the vehicle collides or is subjected to complex external forces, the rectangular cavity can evenly disperse the stress and avoid structural damage caused by stress concentration, thereby providing reliable support for the front end of the vehicle body, ensuring the stability and safety of the overall structure of the vehicle body, and reducing the squeeze on the living space of passengers in the vehicle due to collision deformation. The front overlap and rear overlap portions respectively arranged at the front and rear can tightly and firmly connect the longitudinal beam on the front cabin with the front end frame of the vehicle body and the A-pillar of the vehicle body. The effective overlap of multiple parts enhances the connection rigidity of the longitudinal beam in the vehicle body structure, further improves the structural strength of the entire front part of the vehicle body, helps to maintain the integrity of the vehicle body shape under various driving conditions, and reduces the probability of abnormal noise and reduced handling caused by vehicle body deformation. The avoidance structure in the cavity structure is specifically used to avoid tires and headlights. This design can ensure the structural strength of the upper longitudinal beam of the front engine compartment while providing sufficient space for the steering movement of the tires and the installation of the headlights, avoiding interference between the longitudinal beam and these key components, making the layout of the vehicle's parts more reasonable and compact, which is conducive to improving the assembly efficiency in the vehicle production process and reducing the difficulty and cost of assembly. The hinge mounting bracket can be hingedly connected to the hood through a hinge, providing a dedicated and stable connection point for the installation of the hood. This integrated design simplifies the connection structure between the hood and the body, making the opening and closing of the hood smoother and more stable, reducing the appearance and use problems such as uneven hood gaps and loose closure caused by loose or unstable connections, and improving the appearance quality of the vehicle and the user experience. Good structural strength and stability help improve the vehicle's handling performance. When the vehicle is driving at high speed, turning or emergency braking, the upper longitudinal beam of the front engine compartment of the vehicle body can effectively transmit and disperse force, so that the vehicle's suspension system, steering system, etc. can play a better role, maintain the vehicle's driving stability and control accuracy, and reduce the risk of control errors caused by body deformation. In terms of collision safety, the longitudinal beam structure can effectively absorb and disperse collision energy. Through the deformation of the rectangular cavity structure and the synergy with other parts of the vehicle body, the energy generated by the collision is transmitted and dissipated along a predetermined path, reducing the direct impact of the collision energy on the cockpit and protecting the lives of passengers in the car. This is in line with the modern automobile safety design concept and meets the requirements of relevant safety regulations and collision test standards. Multiple partition structures are arranged at intervals along the length of the cavity structure. When the vehicle body is subjected to external forces, such as bumps and vibrations during a collision or driving, the stress generated by the external force will be transmitted to the cavity structure. The presence of the partition allows the stress to be more evenly dispersed inside the cavity.Originally, stress may be concentrated in certain local areas of the cavity, resulting in excessive local deformation or even damage. The partitions are like "barriers" that guide stress in different directions, avoiding excessive stress concentration in one place, greatly enhancing the ability of the entire cavity structure to cope with external forces, and thus improving the overall strength of the upper longitudinal beam structure of the front engine compartment. Taking a frontal collision of a vehicle as an example, the huge impact force generated by the collision will be transmitted from the front to the upper longitudinal beam of the front engine compartment. At this time, the partition structure can help the cavity structure better withstand and disperse this impact force, so that the longitudinal beam will not be rapidly deformed or broken due to local inability to withstand pressure at the moment of collision, providing more reliable support and protection for the front end of the vehicle body. During the driving process of the vehicle, especially in conditions such as turning and changing lanes, the vehicle body will be subject to torsional force. The partition structure inside the cavity structure can effectively resist this torsional force and enhance the torsional rigidity of the cavity structure. Because the inner and outer side surfaces, top surface and bottom surface of the partition are overlapped and fixed with the inner surface of the cavity structure, a more stable overall frame is formed. When the torsional force attempts to cause the cavity structure to twist and deform, the partition can limit the deformation trend of the cavity from multiple directions, maintain the shape stability of the cavity structure and the entire front cabin upper longitudinal beam, and ensure that the vehicle handling performance is not adversely affected by the twisting and deformation of the longitudinal beam. The partition structure is fully overlapped and fixed to the inner surface of the cavity structure, further stabilizing the shape of the cavity structure itself. This plays an important auxiliary role in the connection stability between the front overlap and the rear overlap and other parts of the vehicle body (such as the front end frame of the vehicle body and the A-pillar of the vehicle body). Since the cavity structure itself is more stable, it can provide a more reliable connection foundation when connected to other parts, reducing the risk of loose connection caused by deformation or shaking of the cavity structure itself, and ensuring the firmness of the connection of the entire front structure of the vehicle body, thereby maintaining the stability of the overall structure of the vehicle body during long-term use of the vehicle, and reducing the possibility of abnormal noise and other problems caused by loose connections. The partition structure inside the cavity structure can play a role in sound insulation to a certain extent. When sound waves encounter a partition during propagation, their propagation path will be blocked. The surface of the partition will reflect part of the sound waves. At the same time, the sound waves will undergo multiple reflections and refractions inside the partition and in the gaps between the partition and the inner surface of the cavity structure, causing the energy of the sound waves to gradually decay, thereby reducing the amount of noise transmitted from the front cabin through the longitudinal beam cavity into the vehicle, creating a relatively quiet driving environment in the vehicle. In some special cases, such as a fire in a vehicle, the front cabin is an area that is relatively prone to fire. The partition structure inside the cavity structure can, to a certain extent, slow down the spread of fire. Because the partition divides the cavity structure into multiple relatively independent small spaces, when a fire occurs in one place, the partition can prevent the flames and heat from spreading rapidly inside the cavity, buying more escape time for the people in the vehicle, and also helping to reduce the overall degree of damage to the vehicle caused by the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a front view of the longitudinal beam structure on the front cabin of the vehicle body in the present invention;

[0018] Figure 2 A top view of the longitudinal beam structure on the front cabin of the vehicle body in the present invention;

[0019] Figure 3 It is an axonometric view of the longitudinal beam structure on the front cabin of the vehicle body in the present invention;

[0020] Figure 4 An exploded view of the longitudinal beam structure on the front cabin of the vehicle body in the present invention;

[0021] Figure 5 for Figure 1 Middle AA section;

[0022] Figure 6 for Figure 1 Middle BB cross section;

[0023] Figure 7 This is a fixed structure diagram of the hinge mounting bracket in the present invention;

[0024] Figure 8 It is a structural diagram of the front end overlap of the longitudinal beam structure on the front cabin of the vehicle body in the present invention;

[0025] Fig. 9 It is a structural diagram of the rear end overlap of the longitudinal beam structure on the front cabin of the vehicle body in the present invention;

[0026] Fig.10 It is a structural diagram of the hinge mounting bracket and the hinge connection in the present invention;

[0027] Among them, 1 is the front outer panel, 2 is the middle outer panel, 3 is the rear outer panel, 4 is the front middle inner panel, 5 is the rear inner panel, 6 is the front lap plate, 7 is the body A-pillar accommodating cavity, 8 is the first avoidance structure, 9 is the second avoidance structure, 10 is the third avoidance structure, 11 is the hinge mounting plate, 12 is the hinge fixing reinforcement plate, 13 is the body front end frame column, 14 is the light panel beam, 15 is the body A-pillar, 16 is the hinge, 17 is the hinge lower reinforcement plate, 18 is the front partition, 19 is the middle partition, 20 is the rear partition. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] In certain embodiments, such as Figure 1 As shown in FIG. 10 , the upper longitudinal beam structure of the front cabin of the vehicle body includes a cavity structure with a rectangular cross-section inside, and the front and rear parts of the cavity structure are respectively provided with a front overlap portion and a rear overlap portion; the cavity structure includes an avoidance structure for avoiding tires and headlights and a hinge mounting bracket that can be hingedly connected to the hood through a hinge 16.

[0030] Embodiment 1

[0031] The cavity structure includes an outer plate structure arranged along its length direction, and an inner plate structure arranged along its length direction; the top of the outer plate structure and the top of the inner plate structure are overlapped and fixed along the length direction of the cavity structure, and the bottom of the outer plate structure and the bottom of the inner plate structure are overlapped and fixed along the length direction of the cavity structure; the outer plate structure and the inner plate structure form a cavity structure. The outer panel structure includes multiple outer panels fixedly connected end to end, including a front outer panel 1, a middle outer panel 2 and a rear outer panel 3; the inner panel structure includes multiple inner panels fixedly connected end to end, including a front middle inner panel 4 and a rear inner panel 5; the top and bottom of the front outer panel 1 are respectively overlapped and fixed with the top and bottom of the front part of the front middle inner panel 4 to form a front cavity structure, the top and bottom of the middle outer panel 2 are respectively overlapped and fixed with the top and bottom of the middle and rear part of the front middle inner panel 4 to form a middle cavity structure, and the top and bottom of the rear outer panel 3 are respectively overlapped and fixed with the top and bottom of the rear inner panel 5 to form a rear cavity structure; the cavity structure includes a front cavity structure, a middle cavity structure and a rear cavity structure. The front cavity structure includes a first avoidance structure 8 whose bottom surface is uniformly raised upward along the length direction of the front cavity structure, the middle cavity structure includes a second avoidance structure 9 whose middle part of the bottom surface is arched upward and whose front part is overlapped and fixed with the rear part of the first avoidance structure 8, and the rear cavity structure includes a third avoidance structure 10 whose bottom surface is uniformly lowered downward along the length direction of the rear cavity structure and whose front part is overlapped and fixed with the rear part of the second avoidance structure 9. The avoidance structure includes the first avoidance structure 8, the second avoidance structure 9 and the third avoidance structure 10. A plurality of partition structures (front partition 18, middle partition 19 and rear partition 20) are arranged at intervals inside the cavity structure along its length direction, and the inner and outer side surfaces, top surface and bottom surface of the partition structure are overlapped and fixed with the inner surface of the cavity structure.

[0032] Embodiment 2

[0033] The front end of the front cavity structure is fixedly connected with a front overlapping portion, which includes a front overlapping plate 6 vertically fixedly connected to the front end of the front outer plate 1.

[0034] Embodiment 3

[0035] The rear inner and outer sides of the rear cavity structure extend rearward along the length direction of the rear cavity structure and form a vehicle body A-pillar accommodating cavity 7 with the top rear end of the rear cavity structure. The rear overlapping part includes the extension parts of the rear inner and outer sides of the rear cavity structure and the top rear end surface of the rear cavity structure.

[0036] Embodiment 4

[0037] The hinge mounting bracket includes an L-shaped hinge mounting plate 11 whose bottom surface is fixed to the top surface of the rear cavity structure, and an L-shaped hinge fixing reinforcement plate 12 whose bottom surface is fixed to the top surface of the rear cavity structure. The vertical surface of the hinge fixing reinforcement plate 12 is fitted and fixedly connected with the vertical surface of the hinge mounting plate 11. In order to further strengthen the structure of the hinge mounting bracket, a hinge lower reinforcement plate 17 can be arranged at the fixing position of the hinge mounting bracket. The bottom surface of the hinge mounting plate 11 and the bottom surface of the hinge fixing reinforcement plate 12 are both fixed on the hinge lower reinforcement plate 17.

[0038] Embodiment 5

[0039] A connection structure of a longitudinal beam structure on a front engine compartment of a vehicle body, wherein a front overlap portion of the longitudinal beam structure on the front engine compartment of the vehicle body is fixedly connected to a front frame column 13 and a light panel beam 14 of the vehicle body, and a rear overlap portion is fixedly connected to an A-pillar 15 of the vehicle body, an avoidance structure is located above the tire and the front headlight, and a hinge mounting bracket is hingedly connected to a hood via a hinge 16.

[0040] The upper longitudinal beam structure of the front engine compartment of the vehicle body designed by the present invention effectively reduces the number of parts, has good structural stability, and has high rigidity at the mounting point. At the same time, the hood can be adjusted in the X and Z directions through the hinge mounting bracket and the hinge 16, which is convenient for adjusting the gap of the hood during assembly. The front frame column 13 of the vehicle body is connected to the A-pillar 15 of the vehicle body through the upper longitudinal beam of the front engine compartment of the vehicle body, and the inner and outer plates are welded together to form a rectangular cavity structure, which improves the dynamic stiffness of the first suspension and improves the first-order bending torsion mode of the vehicle body. The shape of the upper longitudinal beam of the front engine compartment of the vehicle body presents a spatial S shape, which can leave more space for the arrangement of tires and headlights, and improve the space utilization of the front compartment.

[0041] The material of the upper longitudinal beam of the front cabin of the vehicle body is D1300HF+AS (15 / 15) hot-formed steel, and the front area is H420DPD+Z (50 / 50) high-strength steel. When the car collides, the softer area in the front will first undergo plastic deformation to absorb energy and adjust the acceleration peak of the vehicle. The rear hot-formed area controls the deformation to reduce the intrusion into the passenger compartment and protect the safety of the driver in the passenger compartment.

[0042] In summary, the interior of the present invention has a cavity structure with a rectangular cross-section, and this structural design can effectively improve the bending and torsion resistance of the longitudinal beam. When the vehicle collides or is subjected to complex external forces, the rectangular cavity can evenly disperse the stress and avoid structural damage caused by stress concentration, thereby providing reliable support for the front end of the vehicle body, ensuring the stability and safety of the overall structure of the vehicle body, and reducing the squeeze on the living space of passengers in the vehicle due to collision deformation. The front overlap and rear overlap, which are respectively arranged at the front and rear, can make the longitudinal beam on the front cabin tightly and firmly connected with the front end frame of the vehicle body and the A-pillar of the vehicle body. The effective overlap of multiple parts enhances the connection rigidity of the longitudinal beam in the vehicle body structure, further improves the structural strength of the entire front part of the vehicle body, helps to maintain the integrity of the vehicle body shape under various driving conditions, and reduces the probability of abnormal noise and reduced handling caused by vehicle body deformation. The avoidance structure in the cavity structure is specifically used to avoid tires and headlights. This design can ensure the structural strength of the upper longitudinal beam of the front engine compartment while providing sufficient space for the steering movement of the tires and the installation of the headlights, avoiding interference between the longitudinal beam and these key components, making the layout of the vehicle's parts more reasonable and compact, which is conducive to improving the assembly efficiency in the vehicle production process and reducing the difficulty and cost of assembly. The hinge mounting bracket can be hingedly connected to the hood through a hinge, providing a dedicated and stable connection point for the installation of the hood. This integrated design simplifies the connection structure between the hood and the body, making the opening and closing of the hood smoother and more stable, reducing the appearance and use problems such as uneven hood gaps and loose closure caused by loose or unstable connections, and improving the appearance quality of the vehicle and the user experience. Good structural strength and stability help improve the vehicle's handling performance. When the vehicle is driving at high speed, turning or emergency braking, the upper longitudinal beam of the front engine compartment of the vehicle body can effectively transmit and disperse force, so that the vehicle's suspension system, steering system, etc. can play a better role, maintain the vehicle's driving stability and control accuracy, and reduce the risk of control errors caused by body deformation. In terms of collision safety, the longitudinal beam structure can effectively absorb and disperse collision energy. Through the deformation of the rectangular cavity structure and the synergy with other parts of the vehicle body, the energy generated by the collision is transmitted and dissipated along a predetermined path, reducing the direct impact of the collision energy on the cockpit and protecting the lives of passengers in the car. This is in line with the modern automobile safety design concept and meets the requirements of relevant safety regulations and collision test standards. Multiple partition structures are arranged at intervals along the length of the cavity structure. When the vehicle body is subjected to external forces, such as bumps and vibrations during a collision or driving, the stress generated by the external force will be transmitted to the cavity structure. The presence of the partition allows the stress to be more evenly dispersed inside the cavity.Originally, stress may be concentrated in certain local areas of the cavity, resulting in excessive local deformation or even damage. The partitions are like "barriers" that guide stress in different directions, avoiding excessive stress concentration in one place, greatly enhancing the ability of the entire cavity structure to cope with external forces, and thus improving the overall strength of the upper longitudinal beam structure of the front engine compartment. Taking a frontal collision of a vehicle as an example, the huge impact force generated by the collision will be transmitted from the front to the upper longitudinal beam of the front engine compartment. At this time, the partition structure can help the cavity structure better withstand and disperse this impact force, so that the longitudinal beam will not be rapidly deformed or broken due to local inability to withstand pressure at the moment of collision, providing more reliable support and protection for the front end of the vehicle body. During the driving process of the vehicle, especially in conditions such as turning and changing lanes, the vehicle body will be subject to torsional force. The partition structure inside the cavity structure can effectively resist this torsional force and enhance the torsional rigidity of the cavity structure. Because the inner and outer side surfaces, top surface and bottom surface of the partition are overlapped and fixed with the inner surface of the cavity structure, a more stable overall frame is formed. When the torsional force attempts to cause the cavity structure to twist and deform, the partition can limit the deformation trend of the cavity from multiple directions, maintain the shape stability of the cavity structure and the entire front cabin upper longitudinal beam, and ensure that the vehicle handling performance is not adversely affected by the twisting and deformation of the longitudinal beam. The partition structure is fully overlapped and fixed to the inner surface of the cavity structure, further stabilizing the shape of the cavity structure itself. This plays an important auxiliary role in the connection stability between the front overlap and the rear overlap and other parts of the vehicle body (such as the front end frame of the vehicle body and the A-pillar of the vehicle body). Since the cavity structure itself is more stable, it can provide a more reliable connection foundation when connected to other parts, reducing the risk of loose connection caused by deformation or shaking of the cavity structure itself, and ensuring the firmness of the connection of the entire front structure of the vehicle body, thereby maintaining the stability of the overall structure of the vehicle body during long-term use of the vehicle, and reducing the possibility of abnormal noise and other problems caused by loose connections. The partition structure inside the cavity structure can play a role in sound insulation to a certain extent. When sound waves encounter a partition during propagation, their propagation path will be blocked. The surface of the partition will reflect part of the sound waves. At the same time, the sound waves will undergo multiple reflections and refractions inside the partition and in the gaps between the partition and the inner surface of the cavity structure, causing the energy of the sound waves to gradually decay, thereby reducing the amount of noise transmitted from the front cabin through the longitudinal beam cavity into the vehicle, creating a relatively quiet driving environment in the vehicle. In some special cases, such as a fire in a vehicle, the front cabin is an area that is relatively prone to fire. The partition structure inside the cavity structure can, to a certain extent, slow down the spread of fire. Because the partition divides the cavity structure into multiple relatively independent small spaces, when a fire occurs in one place, the partition can prevent the flames and heat from spreading rapidly inside the cavity, buying more escape time for the people in the vehicle, and also helping to reduce the overall degree of damage to the vehicle caused by the fire.

[0043] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A vehicle body front cabin upper longitudinal beam structure, characterized in that: The invention comprises a cavity structure with a rectangular cross section inside, wherein the front and rear parts of the cavity structure are respectively provided with a front overlap part for being fixedly connected to the front end frame of the vehicle body, and a rear overlap part for being overlapped and fixed to the A-pillar (15) of the vehicle body; the cavity structure comprises an avoidance structure for avoiding tires and front headlights, and a hinge mounting bracket which can be hingedly connected to the hood via a hinge (16).

2. The vehicle body front cabin upper longitudinal beam structure according to claim 1, characterized in that: The cavity structure includes an outer panel structure arranged along its length direction, and an inner panel structure arranged along its length direction; the top of the outer panel structure and the top of the inner panel structure are overlapped and fixed along the length direction of the cavity structure, and the bottom of the outer panel structure and the bottom of the inner panel structure are overlapped and fixed along the length direction of the cavity structure; the outer panel structure and the inner panel structure form the cavity structure.

3. The vehicle body front cabin upper longitudinal beam structure according to claim 2, characterized in that: The outer panel structure comprises a plurality of outer panels fixedly connected end to end, including a front outer panel (1), a middle outer panel (2) and a rear outer panel (3); the inner panel structure comprises a plurality of inner panels fixedly connected end to end, including a front middle inner panel (4) and a rear inner panel (5); the top and bottom of the front outer panel (1) are respectively overlapped and fixed with the top and bottom of the front part of the front middle inner panel (4) to form a front cavity structure; the top and bottom of the middle outer panel (2) are respectively overlapped and fixed with the top and bottom of the middle and rear part of the front middle inner panel (4) to form a middle cavity structure; the top and bottom of the rear outer panel (3) are respectively overlapped and fixed with the top and bottom of the rear inner panel (5) to form a rear cavity structure; the cavity structure comprises the front cavity structure, the middle cavity structure and the rear cavity structure.

4. The vehicle body front cabin upper longitudinal beam structure according to claim 3, characterized in that: The front end of the front cavity structure is fixedly connected to the front overlapping portion, which comprises a front overlapping plate (6) vertically fixedly connected to the front end of the front outer plate (1) or the front end of the front middle inner plate (4).

5. The vehicle body front cabin upper longitudinal beam structure as claimed in claim 3, characterized in that: The inner and outer sides of the rear part of the rear cavity structure both extend rearward along the length direction of the rear cavity structure, and form a vehicle body A-pillar accommodating cavity (7) with the top rear end of the rear cavity structure, and the rear overlap portion includes the extensions of the inner and outer sides of the rear part of the rear cavity structure and the top rear end surface of the rear cavity structure.

6. The vehicle body front cabin upper longitudinal beam structure as claimed in claim 3, characterized in that: The front cavity structure comprises a first avoidance structure (8) whose bottom surface is uniformly raised upward along the length direction of the front cavity structure; the middle cavity structure comprises a second avoidance structure (9) whose bottom surface is arched upward in the middle and whose front portion is overlapped and fixed with the rear portion of the first avoidance structure (8); the rear cavity structure comprises a third avoidance structure (10) whose bottom surface is uniformly lowered downward along the length direction of the rear cavity structure and whose front portion is overlapped and fixed with the rear portion of the second avoidance structure (9); the avoidance structures comprise the first avoidance structure (8), the second avoidance structure (9) and the third avoidance structure (10).

7. The vehicle body front cabin upper longitudinal beam structure as claimed in claim 3, characterized in that: The hinge mounting bracket comprises an L-shaped hinge mounting plate (11) whose bottom surface is fixed to the top surface of the rear cavity structure.

8. The vehicle body front cabin upper longitudinal beam structure as claimed in claim 7, characterized in that: The hinge mounting bracket also includes an L-shaped hinge fixing reinforcement plate (12) whose bottom surface is fixed to the top surface of the rear cavity structure, and the vertical surface of the hinge fixing reinforcement plate (12) is fitted and fixedly connected to the vertical surface of the hinge mounting plate (11).

9. The vehicle body front cabin upper longitudinal beam structure according to claim 1, characterized in that: A plurality of partition structures are arranged at intervals inside the cavity structure along its length direction, and the inner and outer side surfaces, the top surface and the bottom surface of the partition structure are overlapped and fixed with the inner surface of the cavity structure.

10. A connection structure of the upper longitudinal beam structure of the front engine compartment of the vehicle body according to any one of claims 1 to 9, characterized in that: The front overlap portion of the longitudinal beam structure on the front cabin of the vehicle body is fixedly connected to the front frame column (13) and the light panel beam (14) of the vehicle body, and the rear overlap portion is fixedly connected to the A-pillar (15) of the vehicle body. The avoidance structure is located above the tires and the front headlights of the vehicle, and the hinge mounting bracket is hingedly connected to the hood via a hinge (16).

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