Cross beam and longitudinal beam connecting structure of vehicle frame, vehicle frame and vehicle

Abstract

The utility model relates to the technical field of vehicle structures, and discloses a connecting structure of a cross beam and a longitudinal beam of a frame, the cross beam is of a symmetrical structure and comprises a first n-shaped beam section and a second n-shaped beam section, the length of the top surface of the first n-shaped beam section is greater than that of the top surface of the second n-shaped beam section; the height of the first n-shaped beam section is smaller than that of the second n-shaped beam section; the second n-shaped beam section is located below the first n-shaped beam section, and the top face of the second n-shaped beam section makes contact with and is connected with the inner wall of an opening of the first n-shaped beam section. According to the improved cross beam, the first n-shaped beam section and the second n-shaped beam section are combined up and down, the excellent rigidity performance of an original cross beam is kept, meanwhile, through the ingenious n-shaped design, the height space in a frame is increased, the ground clearance is better, the trafficability of a vehicle is improved, and the service life of the vehicle is prolonged. And the risk that the battery pack is damaged in the driving process is reduced, so that the safety of the whole vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle structures, in particular to a connecting structure of a crossbeam and a longitudinal beam of a vehicle frame, a vehicle frame and a vehicle. Background Art

[0002] Conventional vehicle frame crossbeams are mostly circular tubular beams, often connected via a box-like structure within the frame's inner wall, with the cross-section welded to the inner wall. While this traditional connection method can meet mechanical strength and rigidity requirements to a certain extent, it also presents several significant issues, particularly in modern electric vehicle designs, where these issues become more pronounced.

[0003] Traditional round tube beams must be located in the middle of the frame width to maintain the optimal stress state. This is because the middle position can maximize the support effect of the crossbeam and reduce bending and twisting deformation. However, this strict positioning requirement limits the flexibility of the crossbeam layout. For pure electric vehicles, the height of the battery pack is a key design parameter. The traditional crossbeam position requirement strictly limits the height of the battery pack from the ground, which not only affects the vehicle's passability, but also may increase the risk of damage to the battery pack. The height limit of the battery pack also affects the layout of the interior space, reducing the space for passengers and cargo, and affecting the practicality and comfort of the vehicle. The traditional cross-section welding connection method has high requirements for the welding process, requiring precise positioning and stable welding parameters. Any welding defects will affect the strength and reliability of the connection. The high temperature generated during the welding process will have an adverse effect on the performance of the material, especially the material properties of the heat-affected zone may decline, reducing the strength and life of the overall structure. Utility Model Content

[0004] The utility model aims to provide a connection structure between the crossbeam and the longitudinal beam of a vehicle frame. The new connection method can overcome the above limitations, improve the performance and design flexibility of the vehicle, has important practical significance, and is particularly suitable for pure electric vehicles.

[0005] The basic solution provided by the utility model is: a crossbeam and longitudinal beam connection structure of a vehicle frame, the crossbeam is a symmetrical structure, including a first "X"-shaped beam section and a second "X"-shaped beam section, both of which have openings at the bottom; the top surface length of the first "X"-shaped beam section is greater than the top surface length of the second "X"-shaped beam section; the height of the first "X"-shaped beam section is less than the height of the second "X"-shaped beam section; the second "X"-shaped beam section is located below the first "X"-shaped beam section, and the top surface of the second "X"-shaped beam section is in contact with and connected to the inner wall of the opening of the first "X"-shaped beam section.

[0006] Furthermore, the first "X"-shaped beam section and the second "X"-shaped beam section have the same total length and total width.

[0007] Furthermore, the first "X"-shaped beam section and the second "X"-shaped beam section both include an upper straight segment, a lower straight segment, and a middle segment connecting the upper straight segment and the lower straight segment, and the middle segment has two arcs in opposite directions with different radii, one arc is close to the upper straight segment, and the other arc is close to the lower straight segment.

[0008] Furthermore, the arc radius of the first X-shaped beam section close to the upper straight section is larger than the arc radius close to the lower straight section.

[0009] Furthermore, the arc radius of the second X-shaped beam section close to the upper straight section is smaller than the arc radius close to the lower straight section.

[0010] Furthermore, the second "I"-shaped beam section is connected to the first "I"-shaped beam section through a first connecting member; the longitudinal beam has a U-shaped structure, and when connected to the crossbeam, the U-shaped opening faces the end of the crossbeam and the end of the crossbeam is fixedly connected in the U-shaped opening through the second connecting member.

[0011] Furthermore, the top surface of the end of the first "X"-shaped beam segment and the bottom surface of the end of the second "X"-shaped beam segment are both in contact with the inner wall of the U-shaped opening.

[0012] Based on the above-mentioned crossbeam and longitudinal beam connection structure of a frame, a frame is also provided, including two frame longitudinal beams extending along the length direction of the vehicle body and a plurality of frame crossbeams connected between the two frame longitudinal beams, and the frame longitudinal beams and frame crossbeams have any of the above-mentioned crossbeam and longitudinal beam connection structures of a frame.

[0013] Based on the above-mentioned vehicle frame, a vehicle is also provided, comprising any of the above-mentioned vehicle frames.

[0014] The working principle and advantages of this utility model are:

[0015] Compared with the existing technology, the advantages of this solution are:

[0016] 1) The improved frame crossbeam utilizes a first "J"-shaped beam section and a second "J"-shaped beam section in an upper and lower combination, maintaining the excellent rigidity of the original crossbeam. At the same time, the "J"-shaped design cleverly increases the height space inside the frame, making the internal Z-direction space of the frame larger, making the battery pack layout space larger, and providing greater compatibility with the battery pack. The battery pack can be placed lower and has a better ground clearance. The higher ground clearance not only improves the vehicle's passability, but also reduces the risk of damage to the battery pack during driving, thereby improving the safety of the entire vehicle.

[0017] 2) The arc structure design in the "J"-shaped beam section can better disperse and evenly distribute stress, reducing stress concentration points. This makes the beam more evenly bear the load and improves the strength of the overall structure. At the same time, the curved surface design of the arc structure makes the beam more resistant to deformation when bending, improving its bending resistance and reducing the risk of damage caused by external forces.

[0018] 3) The connection method is changed from traditional box-type connection and welding to the upper and lower wing surfaces of the frame being connected through a second connecting piece (screw connection). The crossbeam structure is more flexible, does not require welding fixtures, and is more cost-effective. The screw connection simplifies the production process, makes it easier to achieve standardization and automated production, improves production efficiency and the stability of connection quality, which is of great significance for large-scale production and rapid delivery. At the same time, it can avoid welding defects and heat-affected zone problems that may occur during the welding process, ensuring the reliability and durability of the connection.

[0019] 4) It is very suitable for pure electric vehicles and can be efficiently adapted to their battery pack design. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of a connection structure between a crossbeam and a longitudinal beam of a vehicle frame provided in Example 1 of the present utility model;

[0021] Figure 2 This is a structural diagram of a connection structure between a crossbeam and a longitudinal beam of a vehicle frame provided in Example 1 of the present utility model;

[0022] Figure 3 A schematic diagram of the dimension parameters of the connection structure between the crossbeam and the longitudinal beam of a vehicle frame provided in the first embodiment of the present invention;

[0023] Figure 4 This is a schematic structural diagram of a vehicle frame provided in Example 2 of the present utility model;

[0024] Figure 5 for Figure 4 Partial schematic diagram at point A in the middle. DETAILED DESCRIPTION

[0025] The following is a further detailed description through specific implementation methods:

[0026] The marks in the drawings of the specification include: first X-shaped beam section 1, second X-shaped beam section 2, longitudinal beam 3, first connecting member 4, second connecting member 5, frame 6, frame longitudinal beam 61, fourth cross beam 62, fifth cross beam 63, and sixth cross beam 64.

[0027] Example 1

[0028] Basically Figure 1 、 Figure 2 and Figure 3As shown, a crossbeam and longitudinal beam connection structure of a vehicle frame, the crossbeam is a symmetrical structure, including a first "X"-shaped beam section 1 and a second "X"-shaped beam section 2, both of which have openings at the bottom. The total length L1 and total width W1 of the first "X"-shaped beam section 1 and the second "X"-shaped beam section 2 are the same, L1 is 800-900mm, and in this embodiment, L1 is preferably 816mm, and W1 is 150-180mm, and in this embodiment, W1 is preferably 170mm. The sheet metal Q235 is used, the material thickness is 3mm, and it is formed in one piece to ensure the rigidity of the crossbeam.

[0029] The top surface length L2 of the first X-shaped beam section 1 is greater than the top surface length L3 of the second X-shaped beam section 2, which meets the space requirements for the upper and lower combined placement of this solution.

[0030] by Figure 3 The height is determined in the direction indicated by the arrow. The height of the first "X"-shaped beam segment 1 is less than the height of the second "X"-shaped beam segment 2, and the height difference is H1. In this embodiment, H1 is preferably 126 mm. The Z-direction space is expanded by the height of the second "X"-shaped beam segment 2. The height of the first "X"-shaped beam segment 1 can, on the one hand, strengthen the rigidity of the beam, and on the other hand, can provide buffering support for the second "X"-shaped beam segment 2 in the event of extreme deformation.

[0031] The second "X"-shaped beam section 2 is located below the first "X"-shaped beam section 1, and the top surface of the second "X"-shaped beam section 2 is in contact with and connected to the inner wall of the opening of the first "X"-shaped beam section 1. In this embodiment, the connection is made through the first connecting member 4, and rivets can be used.

[0032] like Figure 3 As shown, the first "X"-shaped beam segment 1 and the second "X"-shaped beam segment 2 both include an upper straight segment, a lower straight segment, and an intermediate segment connecting the upper straight segment and the lower straight segment. The intermediate segment has two arcs in opposite directions with different radii, one arc close to the upper straight segment, and the other arc close to the lower straight segment. The arc radius R11 of the first "X"-shaped beam segment 1 close to the upper straight segment is greater than the arc radius R12 close to the lower straight segment. In this embodiment, R11 is preferably 15 mm, and R12 is preferably 10 mm. The arc radius R21 of the second "X"-shaped beam segment 2 close to the upper straight segment is smaller than the arc radius R22 close to the lower straight segment. In this embodiment, R21 is preferably 17 mm, and R22 is preferably 23 mm.

[0033] like Figure 1 As shown, along the length of the beam, a protrusion is provided on the centerline of the top surface of the first "X"-shaped beam segment 1 to increase the structural strength and rigidity of the material. A groove is provided on the centerline of the top surface of the second "X"-shaped beam segment 2, which follows the protrusion of the first "X"-shaped beam segment 1, saving lower space while increasing the structural strength of the second "X"-shaped beam segment 2.

[0034] like Figure 2As shown, the longitudinal beam 3 has a U-shaped structure. When connected to the crossbeam, the U-shaped opening faces the end of the crossbeam and is fixedly connected within the U-shaped opening by bolts. The second "X"-shaped beam section 2 is connected to the first "X"-shaped beam section 1 via a second connecting member 5. The top surface of the end of the first "X"-shaped beam section 1 and the bottom surface of the end of the second "X"-shaped beam section 2 both contact the inner wall of the U-shaped opening. In this embodiment, the second connecting member 5 is a bolt, and two M10*20 bolts can be used to improve connection stability.

[0035] The height H2 of the longitudinal beam 3 can be preferably 140 mm in this embodiment; the overlapping length L4 between the end of the cross beam and the longitudinal beam 3 can be preferably 40 mm in this embodiment to ensure effective connection and connection strength; the gap length L5 when the end of the cross beam is connected to the longitudinal beam 3 can be preferably 6 mm in this embodiment. This gap can effectively prevent manufacturing errors and dimensional discrepancies caused by frame deformation.

[0036] The crossbeam and longitudinal beam connection structure of a vehicle frame provided in this embodiment has the following advantages over the prior art:

[0037] 1) The improved frame crossbeam utilizes a first "J"-shaped beam section and a second "J"-shaped beam section in an upper and lower combination, maintaining the excellent rigidity of the original crossbeam. At the same time, the "J"-shaped design cleverly increases the height space inside the frame, making the internal Z-direction space of the frame larger, making the battery pack layout space larger, and providing greater compatibility with the battery pack. The battery pack can be placed lower and has a better ground clearance. The higher ground clearance not only improves the vehicle's passability, but also reduces the risk of damage to the battery pack during driving, thereby improving the safety of the entire vehicle.

[0038] 2) The arc structure design in the "J"-shaped beam section can better disperse and evenly distribute stress, reducing stress concentration points. This makes the beam more evenly bear the load and improves the strength of the overall structure. At the same time, the curved surface design of the arc structure makes the beam more resistant to deformation when bending, improving its bending resistance and reducing the risk of damage caused by external forces.

[0039] 3) The connection method has been changed from traditional box-type connection and welding to screw connection of the upper and lower wing surfaces of the frame. The crossbeam structure is more flexible, does not require welding fixtures, and is more cost-effective. The screw connection simplifies the production process, makes it easier to achieve standardization and automated production, and improves production efficiency and the stability of connection quality, which is of great significance for large-scale production and rapid delivery. At the same time, it can avoid welding defects and heat-affected zone problems that may occur during the welding process, ensuring the reliability and durability of the connection.

[0040] Example 2

[0041] Based on the above-mentioned connection structure between the crossbeam and the longitudinal beam of the frame, this solution also provides a frame 6.

[0042] Specifically, such as Figure 4 and Figure 5 As shown, the vehicle frame 6 includes two longitudinal frame beams 61 extending along the length of the vehicle body, and a plurality of cross-beams connected between the two longitudinal frame beams 61. The longitudinal frame beams 61 and the plurality of cross-beams have the cross-beam-to-longitudinal beam connection structure described above. The plurality of cross-beams include a fourth cross-beam 62, a fifth cross-beam 63, and a sixth cross-beam 64. Specifically, the fourth cross-beam 62, the fifth cross-beam 63, and the sixth cross-beam 64 utilize the novel cross-beam structure of this embodiment and are then connected to the longitudinal frame beams 61 in the manner described above for connecting the first "X"-shaped beam segment 1, the second "X"-shaped beam segment 2, and the longitudinal beam 3.

[0043] Based on the above-mentioned frame, this solution also provides a vehicle that is particularly suitable for pure electric vehicles and can be efficiently adapted to its battery pack design.

[0044] The above description is merely an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. A person of ordinary skill in the art is aware of all common technical knowledge in the technical field to which the utility model belongs before the application date or priority date, is able to obtain all existing technologies in the field, and has the ability to apply conventional experimental means before that date. A person of ordinary skill in the art can, under the guidance of this application, improve and implement the present scheme in combination with his or her own abilities. Some typical known structures or methods should not become an obstacle for a person of ordinary skill in the art to implement the present application. It should be pointed out that a person of ordinary skill in the art can make several variations and improvements without departing from the structure of the present invention. These should also be considered as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A crossbeam and longitudinal beam connection structure of a vehicle frame, characterized in that: The crossbeam is a symmetrical structure, including a first "X"-shaped beam section and a second "X"-shaped beam section, both of which have openings at the bottom; the top surface length of the first "X"-shaped beam section is greater than the top surface length of the second "X"-shaped beam section; the height of the first "X"-shaped beam section is less than the height of the second "X"-shaped beam section; the second "X"-shaped beam section is located below the first "X"-shaped beam section, and the top surface of the second "X"-shaped beam section is in contact with and connected to the inner wall of the opening of the first "X"-shaped beam section.

2. The crossbeam and longitudinal beam connection structure of a vehicle frame according to claim 1, characterized in that: The total length and total width of the first "X"-shaped beam section and the second "X"-shaped beam section are the same.

3. The crossbeam and longitudinal beam connection structure of a vehicle frame according to claim 1, characterized in that: The first and second "X"-shaped beam sections each include an upper straight section, a lower straight section, and a middle section connecting the upper and lower straight sections. The middle section has two arcs in opposite directions with different radii, one arc close to the upper straight section, and the other arc close to the lower straight section.

4. The crossbeam and longitudinal beam connection structure of a vehicle frame according to claim 3, characterized in that: The arc radius of the first X-shaped beam section close to the upper straight section is larger than the arc radius close to the lower straight section.

5. The crossbeam and longitudinal beam connection structure of a vehicle frame according to claim 3, characterized in that: The arc radius of the second X-shaped beam section close to the upper straight section is smaller than the arc radius close to the lower straight section.

6. A crossbeam and longitudinal beam connection structure for a vehicle frame according to any one of claims 1 to 5, characterized in that: The second "X"-shaped beam section is connected to the first "X"-shaped beam section through a first connecting piece; the longitudinal beam has a U-shaped structure, and when connected to the cross beam, the U-shaped opening faces the end of the cross beam and the end of the cross beam is fixedly connected in the U-shaped opening through the second connecting piece.

7. The crossbeam and longitudinal beam connection structure of a vehicle frame according to claim 6, characterized in that: The top surface of the end of the first "X"-shaped beam segment and the bottom surface of the end of the second "X"-shaped beam segment are both in contact with the inner wall of the U-shaped opening.

8. A vehicle frame comprising two frame longitudinal beams extending along the length direction of the vehicle body and a plurality of frame cross beams connected between the two frame longitudinal beams, characterized in that: The frame longitudinal beam and frame cross beam have the cross beam and longitudinal beam connection structure of a frame as described in any one of claims 1-7.

9. The vehicle frame according to claim 8, characterized in that: The plurality of frame cross beams include a fourth cross beam, a fifth cross beam and a sixth cross beam.

10. A vehicle, characterized in that: A vehicle frame comprising the vehicle frame according to claim 8.

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