Rear cross beam assembly for auxiliary frame, auxiliary frame and vehicle
By designing a variable cross-section structure and surface contact welding for the rear crossbeam of the subframe, the problem of insufficient dynamic stiffness of the subframe was solved, vibration isolation and NVH performance were improved, force transmission and collision performance were optimized, and manufacturing costs were reduced.
Patent Information
- Application Number
- CN202423318939.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The existing subframe's rear crossbeam structure has poor dynamic stiffness, which affects the overall dynamic stiffness of the subframe, resulting in poor vibration isolation and NVH performance.
The cross-section of the rear beam body is designed as a variable cross-section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. Combined with surface contact welding and a hollow structure, this improves dynamic stiffness and connection strength.
The overall dynamic stiffness of the subframe was improved, vibration isolation and NVH performance were enhanced, force transmission and collision performance were optimized, and manufacturing costs were reduced.
Smart Images
Figure CN223835668U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of rear crossbeam assembly technology, and more particularly to a rear crossbeam assembly for a subframe, a subframe, and a vehicle. Background Technology
[0002] As a force-transmitting structure connecting the suspension and the body, the subframe can reduce the vibration and noise transmitted from the suspension to the body to a certain extent. However, with the rapid development of the automotive industry and the increasing complexity of automotive power types, higher requirements are placed on the reliability and performance of the subframe.
[0003] In related technologies, the dynamic stiffness of the rear crossbeam structure in the subframe is currently poor, which affects the overall dynamic stiffness of the subframe, resulting in poor vibration isolation performance and significantly reducing the NVH performance of the subframe. Utility Model Content
[0004] This application provides a rear crossbeam assembly for a subframe, a subframe, and a vehicle. The cross-section of the rear crossbeam body is constructed as a variable cross-section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross-section of the rear crossbeam body, which is beneficial to improving the dynamic stiffness of the rear crossbeam body, thereby improving the overall dynamic stiffness of the subframe, and further improving the vibration isolation performance and NVH performance of the subframe.
[0005] To achieve the above objectives, the main technical solutions adopted in this application include:
[0006] In a first aspect, embodiments of this application provide a rear crossbeam assembly for a subframe, comprising:
[0007] The rear crossbeam body is a hollow structure. Along the length of the rear crossbeam body, the rear crossbeam body includes a first connecting section, a first transition section, an intermediate section, a second transition section, and a second connecting section connected in sequence.
[0008] The middle section has an octagonal cross-section, the first connecting section and the second connecting section both have quadrilateral cross-sections, the cross-section at the connection between the first transition section and the first connecting section is a quadrilateral, the cross-section at the connection between the first transition section and the middle section is an octagonal, the cross-section at the connection between the second transition section and the second connecting section is a quadrilateral, and the cross-section at the connection between the second transition section and the middle section is an octagonal.
[0009] The rear crossbeam assembly for a subframe proposed in the first aspect of this application has a cross-section structure in which the cross-section of the rear crossbeam body is constructed as a variable cross-section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross-section of the rear crossbeam body, which is beneficial to improving the dynamic stiffness of the rear crossbeam body, thereby improving the overall dynamic stiffness of the subframe, and further improving the vibration isolation performance and NVH performance of the subframe.
[0010] Optionally, along the length of the rear crossbeam body, the first connecting segment has a first open end, and the second connecting segment has a second open end disposed opposite to the first open end;
[0011] From the middle section toward the first open end, the dimensions of the first connecting section and the first transition section gradually increase in the width direction of the rear crossbeam body, and the dimensions of the first connecting section are all larger than the dimensions of the first transition section.
[0012] From the middle section toward the second open end, the dimensions of the second connecting section and the second transition section gradually increase in the width direction of the rear crossbeam body, and the dimensions of the second connecting section are all larger than the dimensions of the second transition section.
[0013] This configuration allows for more effective guidance of force transmission between the first and second longitudinal beams, resulting in superior force transmission performance and thus improving the collision performance of the subframe.
[0014] Optionally, along the height direction of the rear crossbeam body, the first open end has a first flange and a second flange arranged opposite to each other, and both the first flange and the second flange are suitable for fixed connection with the first longitudinal beam of the subframe.
[0015] Along the height direction of the rear crossbeam body, the second open end has a third flange and a fourth flange arranged opposite to each other, and both the third flange and the fourth flange are suitable for fixed connection with the second longitudinal beam of the subframe.
[0016] With this configuration, compared to the previous line contact welding between the rear crossbeam body and the first and second longitudinal beams, this application sets the contact between the rear crossbeam body and the first and second longitudinal beams as surface contact welding, which increases the contact area and thus helps to improve the connection strength between the rear crossbeam body and the first and second longitudinal beams, and further improves the dynamic stiffness and collision performance of the subframe.
[0017] Optionally, along the height direction of the rear crossbeam body, the dimension of the middle section in the height direction of the rear crossbeam body is greater than the dimension of the first connecting section in the height direction of the rear crossbeam body, and the dimension of the middle section in the height direction of the rear crossbeam body is also greater than the dimension of the second connecting section in the height direction of the rear crossbeam body.
[0018] This configuration improves the dynamic stiffness of the middle section in the height direction of the rear crossbeam, which is beneficial to improving the overall dynamic stiffness of the subframe in the vehicle height direction.
[0019] Optionally, the cross-sectional area at any position of the middle section is the same, and the cross-sectional area of the middle section, the cross-sectional area of the first open end, and the cross-sectional area of the second open end are all the same.
[0020] This configuration ensures the consistency of dynamic stiffness between the middle section and the first and second open ends, and also improves the dynamic stiffness performance of the rear crossbeam body in the width direction, thereby helping to improve the overall dynamic stiffness of the subframe in the vehicle length direction.
[0021] Optionally, the rear crossbeam body includes an upper rear crossbeam plate and a lower rear crossbeam plate, with the upper and lower rear crossbeam plates being interlocked to form a hollow structure.
[0022] This design simplifies the manufacturing process of the rear crossbeam compared to a one-piece molded body, which helps reduce costs.
[0023] Optionally, the upper plate of the rear crossbeam has a first connecting surface, a second connecting surface, a third connecting surface, a fourth connecting surface, and a fifth connecting surface connected in sequence, and the lower plate of the rear crossbeam has a sixth connecting surface, a seventh connecting surface, an eighth connecting surface, a ninth connecting surface, and a tenth connecting surface connected in sequence, wherein the first connecting surface and the sixth connecting surface are engaged and connected, and the fifth connecting surface and the tenth connecting surface are engaged and connected to form an intermediate section.
[0024] This design improves the fit accuracy, which in turn helps to improve the manufacturing accuracy and quality stability of the rear crossbeam body.
[0025] Optionally, it also includes: a motor mounting bracket, which has a first connecting part and a second connecting part arranged opposite to each other along the height direction of the rear crossbeam body, wherein the first connecting part is fixedly connected to the third connecting surface and the fourth connecting surface, and the second connecting part is fixedly connected to the ninth connecting surface and the tenth connecting surface.
[0026] This design enables multi-faceted fixed installation of the motor mounting bracket and the intermediate section, increasing the connection length, overlap width, and connection area, which helps to improve welding strength and thus enhances the stability of the motor mounting bracket in supporting the motor.
[0027] Secondly, embodiments of this application provide a subframe, comprising:
[0028] Rear crossbeam assembly, wherein the rear crossbeam assembly is the rear crossbeam assembly of any of the above embodiments;
[0029] The first longitudinal beam and the second longitudinal beam are arranged at intervals along the length of the rear crossbeam body, and the first longitudinal beam and the second longitudinal beam are fixedly connected to both sides of the rear crossbeam assembly.
[0030] The front crossbeam assembly is arranged at intervals with the rear crossbeam assembly along the width direction of the rear crossbeam body, and the front crossbeam assembly is fixedly connected between the first longitudinal beam and the second longitudinal beam.
[0031] The subframe proposed in the second aspect of this application, by providing the aforementioned rear crossbeam assembly, has a cross-section structure in which the cross-section of the rear crossbeam body is constructed as a variable cross-section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross-section of the rear crossbeam body, which is beneficial to improving the dynamic stiffness of the rear crossbeam body, thereby improving the overall dynamic stiffness of the subframe, and further improving the vibration isolation performance and NVH performance of the subframe.
[0032] Thirdly, embodiments of this application provide a vehicle including the subframe described in the second aspect embodiment.
[0033] The vehicle proposed in the third aspect of this application, by having the aforementioned subframe, has a cross-section of the rear crossbeam body that is constructed as a variable cross-section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross-section of the rear crossbeam body, which is beneficial to improving the dynamic stiffness of the rear crossbeam body, thereby improving the overall dynamic stiffness of the subframe, and further improving the vibration isolation performance and NVH performance of the subframe. Attached Figure Description
[0034] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0035] Figure 1 A top view of a subframe provided in one embodiment of this application;
[0036] Figure 2 A top view of the rear crossbeam body provided in one embodiment of this application;
[0037] Figure 3 A top view of a rear crossbeam assembly provided in one embodiment of this application;
[0038] Figure 4 A cross-sectional view of a rear crossbeam assembly provided in one embodiment of this application.
[0039] [Explanation of Labels in the Attached Image]
[0040] Subframe 1000;
[0041] Rear crossbeam assembly 100;
[0042] Rear crossbeam body 1; First connecting section 11; First open end 111; First transition section 12; Middle section 13; Second transition section 14; Second connecting section 15; Second open end 151; Rear crossbeam upper plate 16; First connecting surface 161; Second connecting surface 162; Third connecting surface 163; Fourth connecting surface 164; Fifth connecting surface 165; Rear crossbeam lower plate 17; Sixth connecting surface 171; Seventh connecting surface 172; Eighth connecting surface 173; Ninth connecting surface 174; Tenth connecting surface 175;
[0043] Motor mounting bracket 2; first connecting part 21; second connecting part 22;
[0044] First longitudinal beam 200; Second longitudinal beam 300; Front crossbeam assembly 400. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0047] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.
[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0050] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0051] As a force-transmitting structure connecting the suspension and the body, the subframe can reduce the vibration and noise transmitted from the suspension to the body to a certain extent. However, with the rapid development of the automotive industry and the increasing complexity of automotive power types, higher requirements are placed on the reliability and performance of the subframe.
[0052] In related technologies, the dynamic stiffness of the rear crossbeam structure in the subframe is currently poor, which affects the overall dynamic stiffness of the subframe, resulting in poor vibration isolation performance and significantly reducing the NVH performance of the subframe.
[0053] Based on this, this application proposes a rear crossbeam assembly 100 for a subframe 1000. The cross section of the rear crossbeam body 1 is constructed as a variable cross section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross section of the rear crossbeam body 1, which is beneficial to improving the dynamic stiffness of the rear crossbeam body 1, thereby improving the overall dynamic stiffness of the subframe 1000, and further improving the vibration isolation performance and NVH performance of the subframe 1000.
[0054] It should be noted that the rear crossbeam assembly 100 in this application is applied to the subframe 1000, such as... Figure 1As shown, the subframe 1000 in this application also includes a first longitudinal beam 200, a second longitudinal beam 300, and a front crossbeam assembly 400. The first longitudinal beam 200 and the second longitudinal beam 300 are spaced apart along the length direction of the rear crossbeam body 1 and are fixedly connected to both sides of the rear crossbeam assembly 100. The front crossbeam assembly 400 is spaced apart from the rear crossbeam assembly 100 along the width direction of the rear crossbeam body 1 and is fixedly connected between the first longitudinal beam 200 and the second longitudinal beam 300.
[0055] like Figures 1-4 As shown, the rear crossbeam assembly 100 for a subframe 1000 according to the first aspect embodiment of this application includes a rear crossbeam body 1.
[0056] The rear crossbeam body 1 is constructed as a hollow structure. For example, the rear crossbeam body 1 can be constructed as a hollow tube. Furthermore, along the length direction of the rear crossbeam body 1, the rear crossbeam body 1 includes a first connecting section 11, a first transition section 12, an intermediate section 13, a second transition section 14, and a second connecting section 15 connected in sequence. The cross section of the intermediate section 13 is octagonal. That is to say, the intermediate section 13 can be constructed as a columnar hollow tube composed of eight sequentially connected surfaces. Of course, the cross section of the intermediate section 13 can also be constructed as a decagon, a dodecagon, a circle, etc., thereby forming a columnar hollow tube composed of different connecting surfaces.
[0057] Furthermore, the cross-section of the first connecting segment 11 is quadrilateral, that is, the first connecting segment 11 can be constructed as a columnar hollow tube composed of four sequentially connected surfaces. The first connecting segment 11 and the middle segment 13 are connected on one side by the first transition segment 12. In some embodiments of this application, the cross-section at the connection between the first transition segment 12 and the first connecting segment 11 is quadrilateral, and the cross-section at the connection between the first transition segment 12 and the middle segment 13 is octagonal. This configuration can ensure that the first transition segment 12, the middle segment 13, and the first connecting segment 11 all have good connection performance, avoid excessive torsional deformation at the connection, and thus reduce the dynamic stiffness of the connection between the first transition segment 12, the middle segment 13, and the first connecting segment 11.
[0058] Similarly, the cross-section of the second connecting segment 15 is quadrilateral, that is, the second connecting segment 15 can also be constructed as a columnar hollow tube composed of four sequentially connected surfaces. The second connecting segment 15 and the other side of the middle segment 13 are connected by the second transition segment 14. In some embodiments, the cross-section at the connection between the second transition segment 14 and the second connecting segment 15 is quadrilateral, and the cross-section at the connection between the second transition segment 14 and the middle segment 13 is octagonal. This configuration can ensure that the second transition segment 14, the middle segment 13, and the second connecting segment 15 all have good connection performance, avoid excessive torsional deformation at the connection, and thus reduce the dynamic stiffness of the connection between the second transition segment 14, the middle segment 13, and the second connecting segment 15.
[0059] Meanwhile, the sequential connection of the first connecting section 11, the first transition section 12, the middle section 13, the second transition section 14, and the second connecting section can construct the cross section of the rear crossbeam body 1 into a variable cross section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This is beneficial to improving the dynamic stiffness of the rear crossbeam body 1. When the rear crossbeam body 1 is connected between the first longitudinal beam 200 and the second longitudinal beam 300, it is beneficial to improve the overall dynamic stiffness of the subframe 1000, thereby improving the vibration isolation performance and NVH performance of the subframe 1000.
[0060] Therefore, the cross section of the rear crossbeam body 1 is constructed as a variable cross section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross section of the rear crossbeam body 1, which is beneficial to improving the dynamic stiffness of the rear crossbeam body 1. This, in turn, is beneficial to improving the overall dynamic stiffness of the subframe 1000, thereby improving the vibration isolation performance and NVH performance of the subframe 1000.
[0061] It should be noted that the first transition section 12 and the second transition section 14 can be constructed as smooth and symmetrical transition surfaces, thereby avoiding too many local modes and further improving the dynamic characteristics such as the dynamic stiffness and transfer function of the subframe 1000.
[0062] In some embodiments of this application, such as Figures 1-3 As shown, along the length direction of the rear crossbeam body 1, the first connecting segment 11 has a first open end 111, and the second connecting segment 15 has a second open end 151 disposed opposite to the first open end 111. From the middle segment 13 toward the first open end 111, the dimensions of the first connecting segment 11 and the first transition segment 12 gradually increase in the width direction of the rear crossbeam body 1, and the dimensions of the first connecting segment 11 are all larger than the dimensions of the first transition segment 12. From the middle segment 13 toward the second open end 151, the dimensions of the second connecting segment 15 and the second transition segment 14 gradually increase in the width direction of the rear crossbeam body 1, and the dimensions of the second connecting segment 15 are all larger than the dimensions of the second transition segment 14.
[0063] Specifically, such as Figure 2 As shown, along the length of the rear crossbeam body 1, the first open end 111 of the first connecting section 11 and the second open end 151 of the second connecting section 15 are positioned opposite each other. From the middle section 13 toward the first open end 111, the cross-sectional width of the first transition section 12 in the width direction of the rear crossbeam body 1 gradually increases, and the cross-sectional width of the first connecting section 11 in the width direction of the rear crossbeam body 1 also gradually increases. Furthermore, the width of the first connecting section 11 in the width direction of the rear crossbeam body 1 is greater than the width of the first transition section 12 in the width direction of the rear crossbeam body 1. That is, from the connection point between the first transition section 12 and the middle section 13 to... At the first open end 111, the width of the rear crossbeam body 1 gradually increases; similarly, from the middle section 13 to the second open end 151, the cross-sectional width of the second transition section 14 in the width direction of the rear crossbeam body 1 gradually increases, and the cross-sectional width of the second connecting section 15 in the width direction of the rear crossbeam body 1 also gradually increases. Moreover, the width of the second connecting section 15 in the width direction of the rear crossbeam body 1 is greater than the width of the second transition section 14 in the width direction of the rear crossbeam body 1. In other words, from the connection between the second transition section 14 and the middle section 13 to the second open end 151, the width of the rear crossbeam body 1 also gradually increases.
[0064] Optionally, such as Figures 1-3 As shown, the rear crossbeam body 1 is constructed with a symmetrical structure. The first open end 111 of the rear crossbeam body 1 is fixedly connected to the first longitudinal beam 200, and the second open end 151 of the rear crossbeam body 1 is fixedly connected to the second longitudinal beam 300. That is, the closer the rear crossbeam body 1 is to the first longitudinal beam 200 and the second longitudinal beam 300, the wider the rear crossbeam body 1 becomes. This arrangement can more effectively guide the force transmission between the first longitudinal beam 200 and the second longitudinal beam 300, resulting in better force transmission performance, which is beneficial to improving the collision performance of the subframe 1000.
[0065] In some embodiments of this application, along the height direction of the rear crossbeam body 1, the first open end 111 has a first flange and a second flange arranged opposite to each other. The first flange and the second flange are both adapted to be fixedly connected to the first longitudinal beam 200 of the subframe 1000. Along the height direction of the rear crossbeam body 1, the second open end 151 has a third flange and a fourth flange arranged opposite to each other. The third flange and the third flange are both adapted to be fixedly connected to the second longitudinal beam 300 of the subframe 1000.
[0066] In other words, the first open end 111 of the rear crossbeam body 1 is fixedly connected to the first longitudinal beam 200 through a first flange and a second flange arranged at intervals above and below. The fixed connection method includes, but is not limited to, welding. Furthermore, the second open end 151 of the rear crossbeam body 1 is fixedly connected to the second longitudinal beam 300 through a third flange and a fourth flange arranged at intervals above and below. The fixed connection method includes, but is not limited to, welding. With this configuration, compared to the previous line contact welding between the rear crossbeam body 1 and the first longitudinal beam 200 and the second longitudinal beam 300, this application sets the contact between the rear crossbeam body 1 and the first longitudinal beam 200 and the second longitudinal beam 300 as surface contact welding, which increases the contact area and thus helps to improve the connection strength between the rear crossbeam body 1 and the first longitudinal beam 200 and the second longitudinal beam 300, and further improves the dynamic stiffness and collision performance of the subframe 1000.
[0067] In some embodiments of this application, along the height direction of the rear crossbeam body 1, the dimension of the intermediate section 13 in the height direction of the rear crossbeam body 1 is larger than the dimension of the first connecting section 11 in the height direction of the rear crossbeam body 1, and the dimension of the intermediate section 13 in the height direction of the rear crossbeam body 1 is also larger than the dimension of the second connecting section 15 in the height direction of the rear crossbeam body 1. That is to say, the dimension of the intermediate section 13 in the height direction of the rear crossbeam body 1 is larger than the dimensions of the first connecting section 11 and the second connecting section 15 in the height direction of the rear crossbeam body 1, that is, the intermediate section 13 has a larger dimension in the height direction of the rear crossbeam body 1, thereby improving the dynamic stiffness performance of the intermediate section 13 in the height direction of the rear crossbeam body 1, which is beneficial to improving the overall dynamic stiffness of the subframe 1000 in the vehicle height direction.
[0068] In some embodiments of this application, the cross-sectional area of any position of the intermediate segment 13 is the same, and the cross-sectional area of the intermediate segment 13, the cross-sectional area of the first open end 111, and the cross-sectional area of the second open end 151 are all the same.
[0069] Specifically, the intermediate section 13 can be constructed as a uniform cylindrical hollow tube to ensure that the cross-sectional area of the intermediate section 13 is the same at any position, and that the cross-sectional area of the intermediate section 13, the cross-sectional area of the first open end 111, and the cross-sectional area of the second open end 151 are basically the same. Alternatively, the cross-sectional area of the intermediate section 13 is slightly larger than the cross-sectional areas of the first open end 111 and the second open end 151, or the cross-sectional area of the intermediate section 13 is slightly smaller than the cross-sectional areas of the first open end 111 and the second open end 151. This configuration can ensure the consistency of the dynamic stiffness of the intermediate section 13 with the first open end 111 and the second open end 151, and can also improve the dynamic stiffness performance of the rear crossbeam body 1 in the width direction, thereby helping to improve the overall dynamic stiffness of the subframe 1000 in the vehicle length direction.
[0070] In some embodiments of this application, such as Figure 4 As shown, the rear crossbeam body 1 includes an upper rear crossbeam plate 16 and a lower rear crossbeam plate 17. The upper rear crossbeam plate 16 and the lower rear crossbeam plate 17 are interlocked and connected to form a hollow structure. That is to say, the rear crossbeam body 1 is composed of the upper rear crossbeam plate 16 and the lower rear crossbeam plate 17 that are interlocked. It can be understood that the interlocked upper rear crossbeam plate 16 and the lower rear crossbeam plate 17 form a first connecting section 11, a first transition section 12, an intermediate section 13, a second transition section 14, and a second connecting section 15 that are connected in sequence. The upper rear crossbeam plate 16 and the lower rear crossbeam plate 17 together form a hollow structure. This design simplifies the manufacturing process of the rear crossbeam body 1 compared to a one-piece molded rear crossbeam body 1, which is beneficial to reducing costs.
[0071] In some embodiments of this application, such as Figure 4 As shown, the upper plate 16 of the rear crossbeam has a first connecting surface 161, a second connecting surface 162, a third connecting surface 163, a fourth connecting surface 164 and a fifth connecting surface 165 connected in sequence, and the lower plate 17 of the rear crossbeam has a sixth connecting surface 171, a seventh connecting surface 172, an eighth connecting surface 173, a ninth connecting surface 174 and a tenth connecting surface 175 connected in sequence. The first connecting surface 161 and the sixth connecting surface 171 are fastened together, and the fifth connecting surface 165 and the tenth connecting surface 175 are fastened together to form an intermediate section.
[0072] Specifically, the cross-section of the beam body 1 will be in accordance with... Figure 4Taking the arrangement shown as an example, the first connecting surface 161 and the fifth connecting surface 165 of the upper plate 16 of the rear crossbeam are arranged opposite each other in the width direction of the rear crossbeam body 1. The second connecting surface 162, the third connecting surface 163, and the fourth connecting surface 164 are the three surfaces on the upper side of the rear crossbeam body 1. The angle between any two adjacent connecting surfaces of the upper plate 16 of the rear crossbeam is greater than 90°. Furthermore, the sixth connecting surface 171 and the tenth connecting surface 175 of the lower plate 17 of the rear crossbeam are arranged opposite each other in the width direction of the rear crossbeam body 1. The seventh connecting surface 172, the eighth connecting surface 173, and the ninth connecting surface 174 are the three surfaces on the lower side of the rear crossbeam body 1. The angle between any two adjacent connecting surfaces of the lower plate 17 of the rear crossbeam is greater than 90°. When the upper plate 16 and the lower plate 17 of the rear crossbeam are fastened together, the inner side of the first connecting surface 161 is fastened to the outer side of the sixth connecting surface 171, and the inner side of the fifth connecting surface 165 is fastened to the outer side of the sixth connecting surface 171. The first connecting surface 161 and the sixth connecting surface 171 are fastened together with the outer side of the tenth connecting surface 175, forming the left side of the rear crossbeam body 1, and the fifth connecting surface 165 and the tenth connecting surface 175 together form the right side of the rear crossbeam body 1. It can be understood that since the angle between the first connecting surface 161 and the second connecting surface 162 is greater than 90°, the bending degree of the first connecting surface 161 and the second connecting surface 162 is smaller. The first connecting surface 161 and the second connecting surface 162 have a smaller elastic force after bending. Similarly, the sixth connecting surface 171 and the seventh connecting surface 172 also have a smaller elastic force after bending. Therefore, the fastening assembly of the first connecting surface 161 and the sixth connecting surface 171 can improve the fitting accuracy. Similarly, the fastening assembly of the fifth connecting surface 165 and the tenth connecting surface 175 can also improve the fitting accuracy, thereby helping to improve the manufacturing accuracy and quality stability of the rear crossbeam body 1.
[0073] In some embodiments of this application, such as Figure 3 and 4 As shown, it also includes: a motor mounting bracket 2. Along the height direction of the rear crossbeam body 1, the motor mounting bracket 2 has a first connecting part 21 and a second connecting part 22 arranged opposite to each other. The first connecting part 21 is fixedly connected to the third connecting surface 163 and the fourth connecting surface 164, and the second connecting part 22 is fixedly connected to the ninth connecting surface 174 and the tenth connecting surface 175.
[0074] Specifically, the first connecting part 21 of the motor mounting bracket 2 is fixedly connected to the third connecting surface 163 and the fourth connecting surface 164 of the intermediate section 13, and the second connecting part 22 of the motor mounting bracket 2 is fixedly connected to the ninth connecting surface 174 and the tenth connecting surface 175 of the intermediate section 13. The fixed connection method includes but is not limited to welding, thereby realizing the multi-face fixed installation of the motor mounting bracket 2 and the intermediate section 13, increasing the connection length, overlap width and connection area, which is conducive to improving the welding strength, thereby improving the support stability of the motor mounting bracket 2 for the motor.
[0075] like Figure 1 As shown, the subframe 1000 according to the second aspect embodiment of this application includes: a rear crossbeam assembly 100, a first longitudinal beam 200, a second longitudinal beam 300, and a front crossbeam assembly 400. The rear crossbeam assembly 100 is the same as the rear crossbeam assembly 100 of the first aspect embodiment. Along the length direction of the rear crossbeam body 1, the first longitudinal beam 200 and the second longitudinal beam 300 are spaced apart, and the first longitudinal beam 200 and the second longitudinal beam 300 are fixedly connected to both sides of the rear crossbeam assembly 100. Along the width direction of the rear crossbeam body 1, the front crossbeam assembly 400 is spaced apart from the rear crossbeam assembly 100, and the front crossbeam assembly 400 is fixedly connected between the first longitudinal beam 200 and the second longitudinal beam 300.
[0076] The subframe 1000 proposed in the second aspect of this application, by providing the aforementioned rear crossbeam assembly 100, has a cross-section structure in which the cross-section of the rear crossbeam body 1 is constructed as a variable cross-section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross-section of the rear crossbeam body 1, which is beneficial to improving the dynamic stiffness of the rear crossbeam body 1, thereby improving the overall dynamic stiffness of the subframe 1000, and further improving the vibration isolation performance and NVH performance of the subframe 1000.
[0077] The vehicle according to a third aspect embodiment of this application includes the subframe 1000 of the second aspect embodiment.
[0078] The vehicle proposed in the third aspect of this application, by having the aforementioned subframe 1000, has a cross-section of the rear crossbeam body 1 that is constructed as a variable cross-section structure that gradually transitions from an octagon to a quadrilateral from the middle to both sides. This achieves a gradual change in the cross-section of the rear crossbeam body 1, which is beneficial to improving the dynamic stiffness of the rear crossbeam body 1, thereby improving the overall dynamic stiffness of the subframe 1000, and further improving the vibration isolation performance and NVH performance of the subframe 1000.
[0079] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0080] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.
[0081] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
[0082] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A rear crossbeam assembly for a subframe, characterized in that, include: The rear crossbeam body is a hollow structure. Along the length of the rear crossbeam body, the rear crossbeam body includes a first connecting section, a first transition section, an intermediate section, a second transition section, and a second connecting section connected in sequence. The middle section has an octagonal cross-section, the first connecting section and the second connecting section both have quadrilateral cross-sections, the cross-section at the connection between the first transition section and the first connecting section is a quadrilateral, the cross-section at the connection between the first transition section and the middle section is an octagonal, the cross-section at the connection between the second transition section and the second connecting section is a quadrilateral, and the cross-section at the connection between the second transition section and the middle section is an octagonal.
2. The rear crossbeam assembly for a subframe according to claim 1, characterized in that, Along the length of the rear crossbeam body, the first connecting segment has a first open end, and the second connecting segment has a second open end disposed opposite to the first open end; From the middle section toward the first open end, the dimensions of the first connecting section and the first transition section gradually increase in the width direction of the rear crossbeam body, and the dimensions of the first connecting section are all larger than the dimensions of the first transition section. From the middle section toward the second open end, the dimensions of the second connecting section and the second transition section gradually increase in the width direction of the rear crossbeam body, and the dimensions of the second connecting section are all larger than the dimensions of the second transition section.
3. The rear crossbeam assembly for a subframe according to claim 2, characterized in that, Along the height direction of the rear crossbeam body, the first open end has a first flange and a second flange arranged opposite to each other, and both the first flange and the second flange are adapted to be fixedly connected to the first longitudinal beam of the subframe; Along the height direction of the rear crossbeam body, the second open end has a third flange and a fourth flange arranged opposite to each other, and the third flange and the third flange are both adapted to be fixedly connected to the second longitudinal beam of the subframe.
4. The rear crossbeam assembly for a subframe according to claim 2, characterized in that, Along the height direction of the rear crossbeam body, the dimension of the intermediate section in the height direction of the rear crossbeam body is greater than the dimension of the first connecting section in the height direction of the rear crossbeam body, and the dimension of the intermediate section in the height direction of the rear crossbeam body is also greater than the dimension of the second connecting section in the height direction of the rear crossbeam body.
5. The rear crossbeam assembly for a subframe according to claim 2, characterized in that, The cross-sectional area of the middle section is the same at any position, and the cross-sectional area of the middle section, the cross-sectional area of the first open end, and the cross-sectional area of the second open end are all the same.
6. The rear crossbeam assembly for a subframe according to claim 1, characterized in that, The rear crossbeam body includes an upper rear crossbeam plate and a lower rear crossbeam plate. The upper rear crossbeam plate and the lower rear crossbeam plate are connected by interlocking and form the hollow structure.
7. The rear crossbeam assembly for a subframe according to claim 6, characterized in that, The upper plate of the rear crossbeam has a first connecting surface, a second connecting surface, a third connecting surface, a fourth connecting surface, and a fifth connecting surface connected in sequence. The lower plate of the rear crossbeam has a sixth connecting surface, a seventh connecting surface, an eighth connecting surface, a ninth connecting surface, and a tenth connecting surface connected in sequence. The first connecting surface is engaged with the sixth connecting surface, and the fifth connecting surface is engaged with the tenth connecting surface to form the intermediate section.
8. The rear crossbeam assembly for a subframe according to claim 7, characterized in that, Also includes: The motor mounting bracket has a first connecting part and a second connecting part arranged opposite to each other along the height direction of the rear crossbeam body. The first connecting part is fixedly connected to the third connecting surface and the fourth connecting surface, and the second connecting part is fixedly connected to the ninth connecting surface and the tenth connecting surface.
9. A subframe, characterized in that, include: The rear crossbeam assembly is the rear crossbeam assembly according to any one of claims 1-8; The first longitudinal beam and the second longitudinal beam are arranged at intervals along the length direction of the rear crossbeam body, and the first longitudinal beam and the second longitudinal beam are fixedly connected to both sides of the rear crossbeam assembly. The front crossbeam assembly is arranged at intervals with the rear crossbeam assembly along the width direction of the rear crossbeam body, and the front crossbeam assembly is fixedly connected between the first longitudinal beam and the second longitudinal beam.
10. A vehicle, characterized in that, Includes the subframe as described in claim 9.