CN113942575A - Rear longitudinal beam structure of automobile - Google Patents
Rear longitudinal beam structure of automobile Download PDFInfo
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- CN113942575A CN113942575A CN202111388485.2A CN202111388485A CN113942575A CN 113942575 A CN113942575 A CN 113942575A CN 202111388485 A CN202111388485 A CN 202111388485A CN 113942575 A CN113942575 A CN 113942575A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/152—Front or rear frames
Abstract
The invention discloses a rear longitudinal beam structure of an automobile, which relates to the technical field of automobile equipment manufacturing, and comprises a front section assembly, a middle section assembly and a rear section assembly, and is characterized in that the rear section assembly comprises: the tail end of the rear-section assembly body is connected with a first connecting structure of the rear anti-collision beam assembly; the rear section reinforcing plate is arranged on the rear section assembly, the rear section reinforcing plate is flush with the tail end of the rear section assembly body, and the shape and the position of the rear section reinforcing plate correspond to those of the first connecting structure. According to the invention, the reinforcing plate structure corresponding to the connecting structure of the rear anti-collision beam is arranged on the longitudinal beam structure, so that higher strength and collision force resistance are provided for the rear longitudinal beam structure on the premise of not increasing excessive weight. The rear longitudinal beam assembly is divided into three sections, the middle section is not changed in design, the front end and the rear end are adjusted according to the vehicle type bandwidth, and a design platform is provided for the rear main longitudinal beam.
Description
Technical Field
The invention relates to the technical field of automobile equipment manufacturing, in particular to a rear longitudinal beam structure.
Background
With the development of the automobile industry, safety problems of passenger vehicles are more and more concerned by designers and users, and especially, under the condition of lacking of safety system configuration, the safety performance of the whole automobile structure is particularly important. China has a complete collision star-level evaluation system and a strong inspection regulation, and a vehicle body structure with excellent structural strength is required to protect the safety of passengers. Furthermore, the vehicle body structure with simple structure and process, low cost and good passenger protection effect can effectively improve the competitive position of the vehicle.
The rear longitudinal beam of the automobile is an important part in the automobile body structure, extends from a rear door opening part to a tail part, is combined with a cross beam, a frame and the like, is one of main stress parts when the automobile collides with the rear part, and is an important component for providing safety guarantee for the automobile due to the strength of the rear longitudinal beam and the combination strength of the rear longitudinal beam and other automobile body structures. However, in the conventional vehicle body structure, not only the rear side member itself receives the impact force when the vehicle collides, but also the rear side member itself has a function of transmitting the impact force to the floor and the entire vehicle body frame. Therefore, the rear side member is easily deformed after the collision. However, since the longitudinal beams are affected by collision in different sizes, simply increasing the strength of the structural body of the rear longitudinal beam can add unnecessary load to the vehicle. Therefore, it is very important to develop a rear longitudinal beam structure with appropriate strength and better force transmission performance.
Disclosure of Invention
Aiming at the defects in the prior art and aiming at achieving the purposes, the technical scheme adopted by the invention is to provide a rear longitudinal beam structure of an automobile, which comprises a front section assembly, a middle section assembly and a rear section assembly, wherein the rear section assembly comprises:
the tail end of the rear-section assembly body is connected with a first connecting structure of the rear anti-collision beam assembly;
the rear section reinforcing plate is arranged on the rear section assembly, the rear section reinforcing plate is flush with the tail end of the rear section assembly body, and the shape and the position of the rear section reinforcing plate correspond to those of the first connecting structure.
In some embodiments, the rear section reinforcing panel is an annular structure.
In some embodiments, the rear assembly body has a cavity structure, the outer contour of the rear reinforcing plate is identical to the inner contour of the rear total cost body, and the rear reinforcing plate is fixedly disposed on the inner wall surface of the end of the rear assembly body.
In some embodiments, the rear assembly body comprises:
a rear section upper plate; and the rear section lower plate is connected with the rear section upper plate to form a cavity structure shaped like a Chinese character 'ji'.
In some embodiments, the rear assembly further comprises:
the rear anti-collision beam mounting plate is arranged between the first connecting structure and the rear-section assembly body;
and the rear section supporting piece is attached to the outer wall surface at the tail end of the rear section assembly body and supported on the rear anti-collision beam mounting plate.
In some embodiments, the front end assembly comprises:
the front section assembly body is connected with the threshold assembly;
and the front section reinforcing plate is arranged on the front section assembly body, and the front section assembly body corresponds to the doorsill assembly in the X-direction.
In some embodiments, the front section reinforcing plate has a cavity structure shaped like a Chinese character 'ji', and the opening of the front section reinforcing plate is disposed toward the Y direction.
In some embodiments, the mid-section assembly comprises:
a middle section upper plate;
and the middle section lower plate is connected with the middle section upper plate to form a zigzag cavity structure.
In some embodiments, the center section lower plate is a thermoformed plate having a non-uniform thickness.
In some embodiments, the middle section lower plate is divided into 4 middle section regions with non-uniform thicknesses, the middle section regions are a first region, a second region, a third region and a fourth region from front to back, and the thicknesses of the four middle section regions are the second region, the first region, the third region and the fourth region from large to small.
Compared with the prior art, the invention has the advantages that:
(1) the rear longitudinal beam structure in the embodiment of the invention solves the problem that the rear longitudinal beam structure is deformed due to poor capability of transmitting collision force because the rear section assembly of the rear longitudinal beam structure has insufficient strength when the rear end of an automobile is collided by arranging the reinforcing plate corresponding to the connecting structure of the rear anti-collision beam for the longitudinal beam structure, and the novel structure provides higher strength and collision force resistance for the rear longitudinal beam structure on the premise of not increasing excessive weight.
(2) The rear longitudinal beam structure in the embodiment of the invention is provided with a supporting plate and a rear anti-collision beam mounting plate at the tail end of a rear-section assembly. Both cooperate and both can make back end assembly and the fixed more firm of back anticollision roof beam installation, also provide necessary support function for back longeron structure.
(3) In the embodiment of the invention, a reinforcing plate is also arranged in the front section assembly connected with the threshold assembly, and the position of the reinforcing plate corresponds to the threshold assembly. The reinforcing plate on the front section assembly can effectively improve the strength of the front section assembly when the threshold assembly is subjected to the collision force, and the deformation of the front section assembly is avoided.
(4) The reinforcing plate in the front section assembly in the embodiment of the invention is of a cavity structure in a shape like a Chinese character 'ji', and the opening direction of the reinforcing plate is consistent with the direction of the main collision force applied to the threshold assembly, so that the structure has better collision resistance.
(5) In the embodiment of the invention, the rear longitudinal beam assembly is divided into a front section, a middle section and a rear section, wherein the middle section is not changed in design, and the front end and the rear end are adjusted according to the vehicle type bandwidth, so that a design platform is provided for the rear main longitudinal beam assembly.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a rear longitudinal beam structure in an unjoined state according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a front section assembly of a rear longitudinal beam structure according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a middle section assembly of the rear longitudinal beam structure in the embodiment of the invention;
FIG. 4 is a schematic structural view of a rear section assembly of the rear rail structure in an embodiment of the present invention;
FIG. 5 is a schematic structural view of the assembled state of the front section assembly and the threshold assembly according to the embodiment of the present invention;
FIG. 6 is a schematic structural view of a rear section assembly of the rear rail structure in an embodiment of the present invention;
FIG. 7 is a schematic structural view of the rear section assembly of the rear longitudinal beam structure and the rear impact beam assembly in an assembled state according to the embodiment of the invention;
FIG. 8 is a structural schematic view of an assembled state of a rear longitudinal beam structure and a rear wheel casing in an embodiment of the present invention;
FIG. 9 is a schematic structural view illustrating an assembled state of the rear side rail structure and the rear floor panel assembly according to the embodiment of the present invention.
In the figure: 1. a front section assembly; 10. a front section assembly body; 11. a front section reinforcing plate; 2. a middle section assembly; 21. a middle section upper plate; 22. a middle section lower plate; 23. a first support plate; 24. a second support plate; 25. a third support plate; 26. a fourth support plate; 27. a rear subframe stiffener; 3. a rear section assembly; 30. a rear assembly body; 301. a rear section upper plate; 302. a rear section lower plate; 31. a rear-section reinforcing plate; 32. a rear section support; 33. a rear impact beam mounting plate; 4. a rear impact beam assembly; 41. a first connecting structure; 5. a threshold assembly; 6. a rear wheel cover; 7. a rear floor panel assembly.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Referring to fig. 1, 2 and 3, the present invention provides a rear side member structure of an automobile, including: the front section assembly 1, the middle section assembly 2 and the rear section assembly 3. Wherein the rear section assembly 3 includes: the tail end of the rear-section assembly body 30 is connected with the first connecting structure 41 of the rear anti-collision beam assembly 4; the rear-section reinforcing plate 31 is disposed on the rear-section assembly 3, the rear-section reinforcing plate 31 is flush with the end of the rear-section assembly body 30, and the shape of the rear-section reinforcing plate 31 corresponds to that of the first connecting structure 41.
It can be understood that, in the rear section assembly 3 in the above-mentioned scheme, the rear section reinforcing plate 31 is flush with the end of the rear section assembly body 30, and the flush arrangement has an effect equivalent to using a multi-layer sheet metal structure to resist energy caused by rear collision, so as to ensure that the rear section assembly 3 of the rear longitudinal beam is not deformed. If the rear-end reinforcing plate 31 is moved forward so that it loses its flush structure, the force applied to the end of the rear-end assembly is the greatest due to the rear collision, and if it is not placed flush, it is likely to cause deformation of the rear-end assembly 3. The rear-section reinforcing plate 31 is to be close to the collision end to ensure that the rear-section assembly 3 is not deformed.
In addition, the first connecting structure 41 of the rear impact beam assembly 4 is used to connect with the rear assembly 3, and generally, the force of the rear impact during the rear impact is transmitted to the rear assembly 3 through the first connecting structure 41 via the rear impact beam assembly 4. And a rear-section reinforcing plate 31 is provided at a position corresponding to the first connecting structure 41.
It can be understood that, in the design of the rear-end assembly 3 of the rear side member of the automobile, it is first ensured that the strength of the material from which the rear side member assembly 3 is made cannot be excessively high. Such as: if a thermoformed part is used as a material for the rear assembly 1, the strength thereof is too high. When the rear section assembly of the thermoformed part is used for high-speed collision, although the rear end assembly 3 is not easy to deform due to high strength, large force is transmitted to the front part of the vehicle body, and the battery pack or the fuel tank is damaged. Therefore, the rear assembly 3 is generally made of a high-strength steel material in consideration of the design. The rear-end assembly 3 can absorb energy when dealing with high-speed collision. However, with such an arrangement, when a low-speed collision occurs, the rear assembly 3 is easily subjected to plastic deformation, so that the maintenance is frequent, the repair is difficult, and the maintenance cost is increased. Therefore, in this embodiment, an annular reinforcing plate (i.e., the rear-section reinforcing plate 31) and a supporting plate (i.e., the rear-section supporting member 32) are provided on the rear-section assembly 1. When meetting the low-speed collision, because there is the multiply wood to set up and just can not take place great moulding deformation to make back end assembly 1 can not pass to the anterior segment because of intensity is too high and make the front end equipment impaired when high-speed collision, also be unlikely to take place to warp because of intensity is not enough when receiving the low-speed collision.
It should be noted that the rear assembly body 30 is a cavity structure, the outer contour of the rear reinforcing plate 31 is consistent with the inner contour of the rear assembly body 30, and the rear reinforcing plate 31 is fixedly disposed on the inner wall surface of the end of the rear assembly body 30.
Preferably, as shown in fig. 7, since the first connecting structure 41 generally has a square-shaped energy-absorbing box structure, the rear-section reinforcing plate 31 in this embodiment is also designed to be a hollow annular structure, and its area is consistent with that of the first connecting structure 41 and its position is corresponding to that of the first connecting structure 41.
Specifically, the rear section assembly body 30 is a cavity structure, and the rear section reinforcing plate 31 is attached to an inner wall surface of the rear end of the rear section assembly body 30.
It will be appreciated that the rear assembly body 30 is provided with a cavity configuration to better break up and transmit impact forces.
Preferably, the rear assembly body 30 includes: a rear-section upper plate 301; and a rear section lower plate 302 which is connected with the rear section upper plate 301 to form a zigzag cavity structure. Such a design is for ease of stamping.
Specifically, in the rear-section assembly 3 of the rear longitudinal beam, the material of the rear-section upper plate 301 and the rear-section lower plate 302 is HC550/980 DP.
Preferably, when selecting materials, the materials for manufacturing the rear upper plate 301 and the rear lower plate 302 may reduce the strength compared to the materials for manufacturing the front assembly 1 and the middle assembly 2, so that the strength of the rear assembly body 30 is slightly lower than the strength of the front assembly 1 and the middle assembly 2. This is provided to better absorb energy during a rear impact and to ensure that the mid-section assembly 2 does not deform.
It should be noted that the rear assembly 3 further includes: a rear impact beam mounting plate 33 provided between the first connecting structure 41 and the rear assembly body 30; and the rear-section supporting piece 32 is attached to the outer wall surface of the tail end of the rear-section assembly body 30, and the rear-section supporting piece 32 is supported on the rear anti-collision beam mounting plate 33.
The rear impact beam mounting plate 33 provides a plurality of mounting points for the rear impact beam assembly 4, and also provides a support for the rear section assembly 3. As shown in fig. 6 and 7, the rear impact beam mounting plate 33 is fixedly connected to the first connecting structure 41 by four screws.
Therefore, the rear assembly 3 is provided with the rear reinforcing plate 31 and the rear support 32 in the rear assembly body 30, and the rear reinforcing plate 31 and the rear support are connected and fixed with the rear impact beam assembly 4 through the rear impact beam mounting plate 33, so as to form a complete collision path.
In order to verify the practicability, the applicant performs CAE analysis on the structure of the rear-end assembly 3 in the scheme. In the CAE analysis report, the intrusion amount of the rear side member in the structure of the conventional rear-end assembly 3 (i.e., the structure without the present solution) exceeds 10mm, and does not meet the design requirement. After the rear section assembly body 30, the rear section reinforcing plate 31 and the rear section support member 32 are adopted, the intrusion amount of the rear longitudinal beam is 1.71mm, and the intrusion amount is less than the standard value of 3mm, so that the design requirement is met.
It is worth noting that as shown in fig. 1, the front assembly 1, the middle assembly 2 and the rear assembly 3 can be assemblies for the purpose of universal development, and each part can be individually adjusted for the vehicle model. The front assembly 1, the middle assembly 2 and the rear assembly 3 can be connected together by welding.
In some embodiments, the front-end assembly 1 comprises: a front section assembly body 10 connected with the threshold assembly 5; and a front section reinforcing plate 11 disposed on the front section assembly body 10, wherein the front section assembly body 10 and the rocker assembly 5 are correspondingly overlapped in position in the X direction.
It is understood that the X direction and the Y direction in this embodiment are as shown in fig. 5 and 2. Wherein the X direction generally refers to the longitudinal, fore-and-aft direction and the Y direction generally refers to the lateral, left-and-right direction. Therefore, in the above rocker assembly 5, the force receiving direction of the rocker assembly 5 is generally the Y-direction collision force (i.e., the lateral direction, the left-right direction of the vehicle) at the time of the collision. Since both sides thereof are connected and fixed to the left and right sides of the front section assembly 1, respectively, the front section reinforcing plate 11 in the front section assembly 1 coincides with the position of the rocker assembly 5 in the X direction. Therefore, when the front-end reinforcing plate 11 receives a force in the Y direction, the collision force is transmitted to the front-end reinforcing plate 11, and is not only received by the body of the front-end assembly 1. This improves the strength of the front end assembly 1. Therefore, the opening of the front section reinforcing plate 11 in the scheme can be towards the positive Y direction and the negative Y direction. The stress directions of the openings on the threshold assembly 5 are consistent. This arrangement enhances the strength of the front section assembly 1 to cope with the X-direction and Y-direction impact forces, and the structural arrangement of the front section reinforcing plate 11 makes the front section assembly 1 more effective in coping with the Y-direction impact forces
Preferably, the front section reinforcing plate 11 has a cavity structure shaped like a Chinese character 'ji', and an opening of the front section reinforcing plate 11 is disposed toward the Y direction. As shown in fig. 2, the opening direction is the same as the direction of the collision force applied to the threshold assembly 5, the two ends of the opening of the front section reinforcing plate 11 are supported by the front section assembly 1, and when the collision force is applied to the front section reinforcing plate in the Y direction, the opening direction is the same as the force applied to the front section assembly 1, so that the front section assembly 1 can be prevented from being deformed by better force application. Compared with the traditional design, the structure has better force transmission effect and stronger capacity of resisting collision.
It should be noted that the front assembly 1 is also supported by a thermoformed part, and the compressive strength thereof can withstand a large impact force without deformation when reaching 1500MPa, so as to ensure the safety of the battery pack or the fuel tank.
In some embodiments, the middle section assembly 2 includes: a middle upper plate 21 and a middle lower plate 22. The middle section upper plate 21 and the middle section lower plate 22 are connected to form a zigzag cavity structure. Such a design is also for the convenience of press forming, in addition to the strength of the center section assembly 2 being reinforced by the cavity structure.
It will be appreciated that the center lower panel 22 and the center upper panel of the rear rail structure are similarly thermoformed. But the difference is that the middle section lower plate 22 of the rear longitudinal beam adopts a thermal forming plate (TRB) with different material thickness in the scheme. Because of its unequal thickness, its thickness can be designed in combination with differences in the force transmission path and mounting function of the crash.
Preferably, this embodiment provides a design example of the middle-stage lower plate 22, and the middle-stage lower plate 22 is divided into 4 regions (the first region, the second region, the third region, and the fourth region) with uneven thickness from front to back. The material thickness of the first area, the second area, the third area and the fourth area is 1.8mm/2.0mm/1.6mm/1.4mm in sequence.
As shown in fig. 3, the middle-section lower plate 22 in this embodiment is a hollow structure, so that a support plate or a reinforcing plate can be disposed inside the hollow structure to enhance the strength to meet the requirements of the vehicle type. For example, in fig. 3, the rear end of the mid-section assembly 1 is provided with a rear subframe reinforcement plate 27 to ensure sufficient strength at the attachment point of the subframe to the rear suspension. Further, in order to better transmit the bearing force at the rear suspension to other areas, a first support plate 23, a second support plate 24, a third support plate 25 and a fourth support plate 26 are arranged inside the cavity of the middle section assembly 2. In the development process of a platform vehicle type, the number of the supporting plates can be properly reduced according to vehicle type positioning and the weight of the whole vehicle, and the weight reduction effect is achieved.
In some embodiments, as shown in fig. 8, the rear longitudinal beam structure is connected with the rear wheel cover 6 in a welding mode in the present scheme. As shown in fig. 9, the rear longitudinal beam structure in this embodiment is connected to the rear floor panel assembly 7 by welding.
In another aspect, the present application provides an automobile comprising: automobile body and back longeron structure. The rear side member structure includes: the front section assembly 1, the middle section assembly 2 and the rear section assembly 3. Wherein the rear section assembly 3 includes: the tail end of the rear-section assembly body 30 is connected with the first connecting structure 41 of the rear anti-collision beam assembly 4; the rear-section reinforcing plate 31 is disposed on the rear-section assembly 3, the rear-section reinforcing plate 31 is flush with the end of the rear-section assembly body 30, and the shape of the rear-section reinforcing plate 31 corresponds to that of the first connecting structure 41.
Preferably, as shown in fig. 7, since the first connecting structure 41 generally has a square-shaped energy-absorbing box structure, the rear-section reinforcing plate 31 in this embodiment is also designed to be a hollow annular structure, and its area is consistent with that of the first connecting structure 41 and its position is corresponding to that of the first connecting structure 41.
Specifically, the rear section assembly body 30 is a cavity structure, and the rear section reinforcing plate 31 is attached to an inner wall surface of the rear end of the rear section assembly body 30.
It will be appreciated that the rear assembly body 30 is provided with a cavity configuration to better break up and transmit impact forces.
Preferably, the rear assembly body 30 includes: a rear-section upper plate 301; and a rear section lower plate 302 which is connected with the rear section upper plate 301 to form a zigzag cavity structure. Such a design is for ease of stamping.
Specifically, in the rear-section assembly 3 of the rear longitudinal beam, the material of the rear-section upper plate 301 and the rear-section lower plate 302 is HC550/980 DP.
Preferably, when selecting materials, the materials for manufacturing the rear upper plate 301 and the rear lower plate 302 may reduce the strength compared to the materials for manufacturing the front assembly 1 and the middle assembly 2, so that the strength of the rear assembly body 30 is slightly lower than the strength of the front assembly 1 and the middle assembly 2. This is provided to better absorb energy during a rear impact and to ensure that the mid-section assembly 2 does not deform.
It should be noted that the rear assembly 3 further includes: a rear impact beam mounting plate 33 provided between the first connecting structure 41 and the rear assembly body 30; and the rear-section supporting piece 32 is attached to the outer wall surface of the tail end of the rear-section assembly body 30, and the rear-section supporting piece 32 is supported on the rear anti-collision beam mounting plate 33.
It is worth noting that as shown in fig. 1, the front assembly 1, the middle assembly 2 and the rear assembly 3 can be assemblies for the purpose of universal development, and each part can be individually adjusted for the vehicle model. The front assembly 1, the middle assembly 2 and the rear assembly 3 can be connected together by welding.
In some embodiments, the front-end assembly 1 comprises: a front section assembly body 10 connected with the threshold assembly 5; and a front-section reinforcing plate 11 disposed on the front-section assembly body 10, wherein the front-section assembly body 10 corresponds to the rocker assembly 5 in length in the Y direction.
It is understood that the X direction and the Y direction in this embodiment are as shown in fig. 5 and 2. Wherein the X direction generally refers to the longitudinal, fore-and-aft direction and the Y direction generally refers to the lateral, left-and-right direction. Therefore, in the above rocker assembly 5, the force receiving direction of the rocker assembly 5 is generally the Y-direction collision force (i.e., the lateral direction, the left-right direction of the vehicle) at the time of the collision. Because both sides of the front section reinforcing plate 11 are respectively connected and fixed with the left side and the right side of the front section assembly 1, the front section reinforcing plate 11 in the front section assembly 1 corresponds to the position of the doorsill assembly 5 in the X direction and basically overlaps. Therefore, when the front-section reinforcing plate 11 receives forces in the X-direction and the Y-direction (particularly, the Y-direction), the collision force is transmitted to the front-section reinforcing plate 11, and is not received by the body of the front end assembly 1. This improves the strength of the front end assembly 1 without causing deformation.
Preferably, the front section reinforcing plate 11 has a cavity structure shaped like a Chinese character 'ji', and an opening of the front section reinforcing plate 11 is disposed toward the Y direction. As shown in fig. 2, the opening direction is the same as the direction of the collision force applied to the threshold assembly 5, the two ends of the opening of the front section reinforcing plate 11 are supported by the front section assembly 1, and when the collision force is applied to the front section reinforcing plate in the Y direction, the opening direction is the same as the force applied direction, so that the front section assembly 1 can be prevented from being deformed by better force application. Compared with the traditional design, the structure has better force transmission effect and stronger capacity of resisting collision.
It should be noted that the front assembly 1 is also supported by a thermoformed part, and the compressive strength thereof can withstand a large impact force without deformation when reaching 1500MPa, so as to ensure the safety of the battery pack or the fuel tank.
In some embodiments, the middle section assembly 2 includes: a middle upper plate 21 and a middle lower plate 22. The middle section upper plate 21 and the middle section lower plate 22 are connected to form a zigzag cavity structure. Such a design is also for the convenience of press forming, in addition to the strength of the center section assembly 2 being reinforced by the cavity structure.
It will be appreciated that the center lower panel 22 and the center upper panel of the rear rail structure are similarly thermoformed. But the difference is that the middle section lower plate 22 of the rear longitudinal beam adopts a thermal forming plate (TRB) with different material thickness in the scheme. Because of its unequal thickness, its thickness can be designed in combination with differences in the force transmission path and mounting function of the crash.
Preferably, the present embodiment provides a design example of the middle section lower plate 22, and the middle section lower plate 22 is divided into 4 regions with uneven thickness from front to back. Preferably, the thickness of the material is 1.8mm/2.0mm/1.6mm/1.4mm in sequence.
As shown in fig. 3, the middle-section lower plate 22 in this embodiment is a hollow structure, so that a support plate or a reinforcing plate can be disposed inside the hollow structure to enhance the strength to meet the requirements of the vehicle type. For example, in fig. 3, the rear end of the mid-section assembly 1 is provided with a rear subframe reinforcement plate 27 to ensure sufficient strength at the attachment point of the subframe to the rear suspension. Further, in order to better transmit the bearing force at the rear suspension to other areas, a first support plate 23, a second support plate 24, a third support plate 25 and a fourth support plate 26 are arranged inside the cavity of the middle section assembly 2. In the development process of a platform vehicle type, the number of the supporting plates can be properly reduced according to vehicle type positioning and the weight of the whole vehicle, and the weight reduction effect is achieved.
In some embodiments, the rear longitudinal beam structure is connected with the rear wheel cover 6 in a welding mode in the scheme. The rear longitudinal beam structure in this scheme is connected with rear floor panel assembly 7 in the welding form.
In summary, in the rear longitudinal beam structure in the embodiment of the present invention, the reinforcing plate corresponding to the connecting structure of the rear anti-collision beam is provided for the longitudinal beam structure, so as to solve the problem that the rear longitudinal beam structure is deformed due to the poor impact force transmission capability due to the insufficient strength of the rear section assembly 3 of the rear longitudinal beam structure when the rear end of the automobile is collided, and the new structure provides higher strength and impact force resistance capability for the rear longitudinal beam structure without increasing excessive weight. The rear longitudinal beam structure in the embodiment of the invention is provided with a rear section support member 32 and a rear impact beam mounting plate 33 at the end of the rear section assembly 3. Both cooperate and both can make back end assembly 1 and the fixed more firm of back anticollision roof beam assembly 4 installation, also provide necessary support function for the back longeron structure. In the embodiment of the present invention, a reinforcement plate is also disposed in the front section assembly for connecting with the threshold assembly, and the position of the reinforcement plate is also overlapped with the threshold assembly 5. The reinforcing plate on the front section assembly can effectively improve the strength of the front section assembly when the threshold assembly is subjected to the collision force, and the deformation of the front section assembly is avoided. The reinforcing plate in the front section assembly in the embodiment of the invention is of a cavity structure in a shape like a Chinese character 'ji', and the opening direction of the reinforcing plate is consistent with the direction of the collision force applied to the threshold assembly, so that the structure has better collision resistance.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In the embodiment of the invention, the rear longitudinal beam assembly is divided into three sections, wherein the middle section is not changed in design, and the front end and the rear end are adjusted according to the vehicle type bandwidth, so that a design platform is provided for the rear longitudinal beam assembly.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a rear longitudinal member structure of car, includes anterior segment assembly (1), middle section assembly (2) and back end assembly (3), its characterized in that, back end assembly (3) include:
the tail end of the rear-section assembly body (30) is connected with a first connecting structure (41) of the rear anti-collision beam assembly (4);
back end reinforcement plate (31), it establishes on back end assembly (3), just back end reinforcement plate (31) with the terminal parallel and level of back end assembly body (30), back end reinforcement plate (31) shape and position all with first connection structure (41) correspond.
2. The rear side member structure according to claim 1, wherein: the rear section reinforcing plate (31) is of an annular structure.
3. The rear side member structure according to claim 1 or 2, wherein:
the rear section assembly body (30) is of a cavity structure, the outer contour of the rear section reinforcing plate (31) is consistent with the inner contour of the rear section assembly body (30), and the rear section reinforcing plate (31) is fixedly arranged on the inner wall surface of the tail end of the rear section assembly body (30).
4. The rear side member structure according to claim 3, wherein the rear end assembly body (30) includes:
a rear-section upper plate (301);
and the rear section lower plate (302) is connected with the rear section upper plate (301) to form a zigzag cavity structure.
5. The rear side member structure according to claim 3, wherein the rear end assembly (3) further includes:
a rear impact beam mounting plate (33) disposed between the first connecting structure (41) and the rear section assembly body (30);
and the rear section supporting piece (32) is attached to the outer wall surface of the tail end of the rear section assembly body (30), and the rear section supporting piece (32) is supported on the rear anti-collision beam mounting plate (33).
6. The rear side member structure of an automobile according to claim 1, wherein the front section assembly (1) includes:
a front section assembly body (10) connected with the threshold assembly (5);
and the front section reinforcing plate (11) is arranged on the front section assembly body (10), and the front section assembly body (10) corresponds to the position of the doorsill assembly (5) in the X direction.
7. The rear side member structure of an automobile according to claim 6, wherein:
the front section reinforcing plate (11) is of a cavity structure shaped like a Chinese character 'ji', and an opening of the front section reinforcing plate (11) is arranged towards the Y direction.
8. The rear side member structure of an automobile according to claim 1, wherein the middle section assembly (2) includes:
a middle section upper plate (21);
and the middle section lower plate (22) is connected with the middle section upper plate (21) to form a zigzag cavity structure.
9. The rear side member structure of an automobile according to claim 8, wherein:
the middle section lower plate (22) is a hot forming plate with uneven thickness.
10. The rear side member structure of an automobile according to claim 9, wherein:
the middle section hypoplastron (22) divide into 4 middle section regions that thickness is uneven, the middle section region is first region, second region, third region and fourth region from the past to back in proper order, four the regional thickness of middle section is second region, first region, third region and fourth region from big in proper order.
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| CN202111388485.2A CN113942575B (en) | 2021-11-22 | 2021-11-22 | Rear longitudinal beam structure of automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111388485.2A CN113942575B (en) | 2021-11-22 | 2021-11-22 | Rear longitudinal beam structure of automobile |
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| CN113942575B CN113942575B (en) | 2022-11-04 |
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| CN113942575B (en) | 2022-11-04 |
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