Rear frame structure, frame assembly and vehicle

Abstract

The application relates to a rear frame structure, a frame assembly and a vehicle, comprising: a connecting member used for fixed connection with a rear hinged end of the vehicle; a supporting member fixedly connected with the connecting member and extending rearward along the longitudinal direction of the vehicle, used for bearing a vehicle body located rearward of a hinge point; wherein the bottom of the supporting member is provided with a first bottom section and a second bottom section arranged in sequence along the longitudinal direction of the vehicle, the first bottom section is closer to the connecting member than the second bottom section; and the ground clearance of the first bottom section is greater than that of the second bottom section, so as to form an avoiding space below the front end of the rear frame structure; the application forms the avoiding space below the front end of the rear frame structure, thereby reducing the risk of bottom knocking.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a rear frame structure, frame assembly, and vehicle. Background Technology

[0002] In the field of articulated vehicles, the front and rear bodies are connected by an articulation plate. When facing undulating terrain, the rear body rotates around its axle, thus creating a pitching motion.

[0003] In related technologies, because the articulated plate is far from the axle of the rear vehicle body, the vertical displacement of the front end of the rear vehicle body frame is geometrically amplified during pitching motion, resulting in a higher risk of the front end of the frame colliding with the ground. Utility Model Content

[0004] This application provides a rear frame structure, a frame assembly, and a vehicle, forming an avoidance space below the front end of the rear frame structure, thereby reducing the risk of bottoming out.

[0005] To achieve the above objectives, according to a first aspect of this application, a rear frame structure is provided for a vehicle having an articulated system, comprising: a connecting member for fixedly connecting to the rear articulated end of the vehicle; and a support member for fixedly connecting to the connecting member and extending rearward along the longitudinal direction of the vehicle to support the vehicle body located behind the articulation point; wherein the bottom of the support member has a first bottom section and a second bottom section arranged sequentially from front to back along the longitudinal direction of the vehicle; and the ground clearance of the first bottom section is greater than the ground clearance of the second bottom section to form a clearance space below the front end of the rear frame structure.

[0006] Optionally, the ground clearance of the bottom side of the first bottom section is gradually reduced from front to back to form a longitudinally narrowing clearance space.

[0007] Optionally, the bottom side surface of the first bottom section and the bottom side surface of the second bottom section are both planes; the bottom side surface of the second bottom section is perpendicular to the vertical direction of the vehicle; the bottom side surface of the first bottom section and the bottom side surface of the second bottom section intersect and form an angle α between them, satisfying 125°≤α≤145°.

[0008] Optionally, the front end face of the support member is fixedly connected to the rear side of the connecting member.

[0009] Optionally, the front end face of the support member does not extend beyond the contour edge of the rear side of the connecting member.

[0010] Optionally, the bottom edge of the front end face of the first bottom section is flush with the bottom edge of the rear side of the connecting member, and the bottom side of the first bottom section is continuously transitioned to the bottom side of the connecting member.

[0011] Optionally, the support member includes at least one support beam structure, the support beam structure including: a first longitudinal beam, the front end of which is fixedly connected to the connecting member and extends longitudinally along the vehicle; a second longitudinal beam, which extends longitudinally along the vehicle; the second longitudinal beam at least partially forms a second bottom section; and an inclined beam, which is fixedly connected between the connecting member and the second longitudinal beam; the inclined beam at least partially forms a first bottom section.

[0012] Optionally, the axis of the inclined beam forms an angle θ with the axis of the first longitudinal beam, where 35°≤θ≤55°.

[0013] Optionally, the included angle θ satisfies θ = 45°.

[0014] Optionally, the front end of the inclined beam is fixedly connected to the connecting member; the bottom edge of the front end face of the inclined beam is flush with the bottom edge of the rear side of the connecting member.

[0015] Optionally, the front end of the inclined beam and the front end of the first longitudinal beam are fixed together to the first reinforcing member, and the first reinforcing member is fixed to the rear side of the connecting member.

[0016] Optionally, the first reinforcing member extends laterally into a wing plate, which covers and fixes the front ends of the inclined beam and the first longitudinal beam on both sides.

[0017] Optionally, the first longitudinal beam and the second longitudinal beam are fixedly connected by a first fixed beam.

[0018] Optionally, the rear frame structure also includes a second reinforcement member that extends from the top side of the connecting member to the top side of the first longitudinal beam and is fixed thereon.

[0019] Optionally, the rear frame structure also includes a third reinforcing member, which extends rearward from the bottom side of the connecting member, passing through the bottom side of the inclined beam to the bottom side of the second longitudinal beam and is fixed thereon.

[0020] Optionally, the support member includes a plurality of support beam structures arranged at transverse intervals, each support beam structure being located on a longitudinal reference plane, and adjacent support beam structures being connected by a second fixed beam.

[0021] Optionally, the rear frame structure also includes: two side crossbeams, which are fixed to the lateral ends of the connecting member and extend relative to each other; and a rear crossbeam, which is located behind the connecting member and connected to the supporting member, and extends laterally and is fixed to the side crossbeams through a third fixing beam.

[0022] Optionally, the rear frame structure also includes a floor frame structure, which is fixed to the rear of the rear crossbeam and connected to the lateral sides of the support member.

[0023] Optionally, the connecting member is provided with a wire-passing hole extending through both the front and rear sides; and / or, the front side of the connecting member has a weight-reducing groove.

[0024] According to a second aspect of this application, a vehicle frame assembly is provided, including a rear frame structure of any of the above; further comprising: a front frame structure for supporting a vehicle body located in front of a hinge point; and a hinge structure connected between the front frame structure and the rear frame structure for realizing the hinge between the front frame structure and the rear frame structure.

[0025] According to a third aspect of this application, a vehicle is provided, including the rear frame structure of any of the above.

[0026] In the rear frame structure of this application embodiment, when the rear vehicle body undergoes pitching motion, since the ground clearance of the first bottom section is greater than that of the second bottom section, an avoidance space is formed below the front end of the rear frame structure. Even if the vertical displacement of the front end of the rear vehicle body is amplified during the pitching process, the front end of the rear frame structure is not likely to collide with the ground, thereby reducing the risk of bottoming out.

[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0030] Figure 1 This is a three-dimensional schematic diagram of the rear frame structure provided in the embodiments of this application;

[0031] Figure 2 This is a front view schematic diagram of the rear frame structure provided in the embodiments of this application;

[0032] Figure 3 This is a three-dimensional schematic diagram of the rear frame structure provided in the embodiments of this application from another perspective;

[0033] Figure 4 This is a three-dimensional schematic diagram of the rear frame structure provided in the embodiments of this application from another perspective;

[0034] Figure 5 This is a perspective view of the rear frame structure with a first reinforcing member provided in the embodiments of this application;

[0035] Figure 6 This is a three-dimensional schematic diagram of the rear frame structure with a floor frame structure provided in the embodiments of this application;

[0036] Figure 7 This is a schematic diagram of the stress at the bottom edge weld of the inclined beam and connecting member provided in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Rear frame structure;

[0039] 100. Connecting component; 101. Wire through hole; 102. Weight reduction groove;

[0040] 110. Supporting component; 111. First bottom section; 112. Second bottom section; 113. Clearance space;

[0041] 120. Support beam structure; 121. First longitudinal beam; 122. Second longitudinal beam; 123. Inclined beam; 124. First fixed beam; 125. Second fixed beam;

[0042] 130. First reinforcing member; 131. Wing plate;

[0043] 140. Second reinforcing component;

[0044] 150. Third reinforcing component;

[0045] 160. Side beam;

[0046] 170. Rear crossbeam; 171. Third fixed beam;

[0047] 180. Floor frame structure. Detailed Implementation

[0048] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0049] In this embodiment, the longitudinal direction refers to the front-to-rear axis direction of the vehicle's travel direction, i.e., the direction in which the vehicle body extends when it moves forward or backward. The lateral direction is the horizontal direction perpendicular to the vehicle's longitudinal direction, i.e., the left and right sides of the vehicle. The vertical direction is the direction perpendicular to both the vehicle's longitudinal and lateral directions, i.e., the vehicle's height or vertical direction. The longitudinal reference plane is a plane perpendicular to the vehicle's lateral direction. The lateral reference plane is a plane perpendicular to the vehicle's longitudinal direction. The vertical reference plane is a plane perpendicular to the vehicle's vertical direction.

[0050] In the field of articulated vehicles, the front and rear bodies are connected by an articulation plate. When facing undulating terrain, the rear body rotates around its axle, thus creating a pitching motion.

[0051] In related technologies, because the articulated plate is far from the axle of the rear vehicle body, the vertical displacement of the front end of the rear vehicle body frame is geometrically amplified during pitching motion, resulting in a higher risk of the front end of the frame colliding with the ground.

[0052] Regarding the above technical issues, firstly, refer to Figure 1 , Figure 2 , Figure 3 This application provides a rear frame structure 10 for a vehicle with an articulated system, comprising: a connecting member 100 for fixed connection to the rear articulated end of the vehicle; and a support member 110 for fixed connection to the connecting member 100 and extending rearward along the longitudinal direction of the vehicle to support the vehicle body located behind the articulation point; wherein the bottom of the support member 110 has a first bottom section 111 and a second bottom section 112 arranged sequentially from front to back along the longitudinal direction of the vehicle; and the ground clearance of the first bottom section 111 is greater than the ground clearance of the second bottom section 112, so as to form a clearance space 113 below the front end of the rear frame structure 10.

[0053] For example, the connecting member 100 is a casting, which has high strength and integrity, providing a stable connection foundation for the rear frame structure 10. The supporting member 110 adopts a double-beam structure, with the front ends of the upper and lower beams welded to the connecting member 100, ensuring the firmness and reliability of the connection. The lower beam forms a first bottom section 111 and a second bottom section 112. The double-beam structure design provides sufficient strength and rigidity, enabling it to better support the vehicle body located behind the hinge point, thus enhancing the overall stability of the rear frame structure 10.

[0054] In this embodiment, when the rear vehicle body pitches, since the ground clearance of the first bottom section 111 is greater than that of the second bottom section 112, an avoidance space 113 is formed below the front end of the rear frame structure 10. Even if the vertical displacement of the front end of the rear vehicle body is amplified during the pitching process, the front end of the rear frame structure 10 is not likely to collide with the ground, thereby reducing the risk of bottoming out.

[0055] In some embodiments, reference Figure 1 , Figure 2 , Figure 3 The ground clearance of the bottom side of the first bottom section 111 gradually decreases from front to back to form a longitudinally narrowing clearance space 113.

[0056] In this embodiment, the first bottom section 111 has a continuous bottom side surface, and the height of this bottom side surface from the ground gradually decreases along the longitudinal direction of the vehicle from front to rear. This is designed based on the characteristic that the vertical displacement of the rear vehicle body gradually changes during pitching motion. That is, the closer to the front of the frame, the greater the vertical displacement of the rear vehicle body, requiring a greater clearance height; while the closer to the rear of the frame, the smaller the vertical displacement, requiring a smaller clearance height. Through this design, a clearance space 113 that gradually narrows longitudinally is formed below the first bottom section 111. When the rear vehicle body pitches, this gradually narrowing clearance space 113 can provide the rear frame structure 10 with just the right clearance distance according to the vertical displacement of the rear vehicle body at different positions, making the rear frame structure 10 more flexible and precise in dealing with the pitching motion of the rear vehicle body.

[0057] Furthermore, while meeting the avoidance requirements, this embodiment does not simply increase the avoidance space. Instead, it adopts a gradually narrowing design to avoid the problem of the rear frame structure 10 becoming too weak due to excessive avoidance. By rationally allocating the avoidance space 113, the overall stress on the rear frame structure 10 is made more uniform while ensuring that the risk of bottoming out is effectively reduced. This reduces stress concentration and thus improves the strength and rigidity of the rear frame structure 10.

[0058] In some embodiments, reference Figure 2 The bottom side surface of the first bottom section 111 and the bottom side surface of the second bottom section 112 are both planes; the bottom side surface of the second bottom section 112 is perpendicular to the vertical direction of the vehicle; the bottom side surface of the first bottom section 111 and the bottom side surface of the second bottom section 112 intersect and form an angle α between them, satisfying 125°≤α≤145°.

[0059] In this embodiment, the angle α formed by the bottom side surface of the first bottom section 111 and the bottom side surface of the second bottom section 112 is between 125° and 145°. When the vehicle is subjected to various loads during operation, the force will not be concentrated in a local area, but can be transmitted along the first bottom section 111 and the second bottom section 112, thus optimizing the force transmission path of the rear frame structure 10. Compared with traditional structures, the force transmission method in this embodiment significantly reduces the stress level inside the rear frame structure 10, improving the reliability and safety of the frame.

[0060] In some embodiments, reference Figure 2 , Figure 3 , Figure 4 The front end face of the support member 110 is fixedly connected to the rear side of the connecting member 100.

[0061] In this embodiment, the front end face of the support member 110 is fixedly connected to the rear side of the connecting member 100, so that the force transmitted by the hinge plate can be directly transmitted from the connecting member 100 to the support member 110. This avoids force loss during transmission and reduces structural stress concentration and deformation caused by poor force transmission. At the same time, the front end of the support member 110 is designed in a "bow shape". The "bow shape" structure can guide the longitudinal force to be transmitted along the first bottom section 111 and the second bottom section 112, making the entire rear frame structure 10 more evenly stressed. All parts can cooperate to bear external forces, avoiding structural damage caused by excessive local stress.

[0062] In some embodiments, reference Figure 2 The front end face of the support member 110 does not extend beyond the outline edge of the rear side of the connecting member 100.

[0063] Understandably, in traditional rear frame structures, if the front end of the supporting component protrudes beyond the rear side profile edge of the connecting component, the protruding part often becomes a stress concentration area during force transmission. When the vehicle is subjected to a large external force, these protruding parts may bear excessive stress, leading to local structural deformation or even damage.

[0064] In this embodiment, since the front end face of the support member 110 does not extend beyond the rear side profile edge of the connecting member 100, the force can be evenly distributed on the contact surface between the connecting member 100 and the support member 110 during the transmission process, reducing the possibility of local stress concentration.

[0065] In some embodiments, reference Figure 2 The bottom edge of the front end face of the first bottom section 111 is flush with the bottom edge of the rear side of the connecting member 100, and the bottom side of the first bottom section 111 is continuously transitioned to the bottom side of the connecting member 100.

[0066] Understandably, in a traditional rear frame structure, if there is structural discontinuity or misalignment at the connection between the first bottom section 111 and the connecting member 100, stress concentration will occur at these locations when force is transmitted to them, which can easily lead to fatigue damage and breakage of the rear frame structure.

[0067] In this embodiment, the design of the front end face of the first bottom section 111 being flush with the bottom edge of the rear side of the connecting member 100 and the continuous transition of the bottom side allows the force to be evenly distributed on the contact surface between the connecting member 100 and the first bottom section 111 during the transmission process, reducing the possibility of local stress concentration and enhancing the durability and reliability of the frame.

[0068] In some embodiments, reference Figure 1 , Figure 3 , Figure 4The support member 110 includes at least one support beam structure 120, which includes: a first longitudinal beam 121, whose front end is fixedly connected to the connecting member 100 and extends longitudinally along the vehicle; a second longitudinal beam 122, which extends longitudinally along the vehicle; the second longitudinal beam 122 at least partially forms a second bottom section 112; and an inclined beam 123, which is fixedly connected between the connecting member 100 and the second longitudinal beam 122 and at least partially forms a first bottom section 111.

[0069] In this embodiment, the first longitudinal beam 121 and the diagonal beam 123 work together as the main force transmission structures. The first longitudinal beam 121 provides longitudinal support and connection, receiving and transmitting longitudinal forces; the diagonal beam 123 transmits the force to the second longitudinal beam 122, which then distributes the force to various parts of the frame. The double-layer beam structure formed by the first longitudinal beam 121 and the second longitudinal beam 122 ensures that the force is evenly distributed across the support member 110, avoiding local stress concentration, thereby significantly enhancing the overall structural strength of the support member 110 and improving the stability and reliability of the rear frame structure 10.

[0070] Furthermore, by setting the inclined beam 123 to at least partially form the first bottom section 111 and the second longitudinal beam 122 to at least partially form the second bottom section 112, a clearance space 113 is formed below the inclined beam 123. When the rear vehicle body undergoes pitching motion and the vertical displacement of the front end is amplified, the clearance space 113 can provide sufficient buffer distance for the front end of the rear frame structure 10, effectively preventing the front end of the rear frame structure 10 from colliding with the ground and reducing the risk of the vehicle bottoming out during driving.

[0071] Furthermore, in traditional structures, the floor frame is directly connected to the connecting member 100, resulting in complex and concentrated forces in the connection area, which can easily lead to cracking and other damage. In this embodiment, however, since the first longitudinal beam 121 and the second longitudinal beam 122 are used to connect to the floor frame, the floor frame is not directly connected to the connecting member 100. This reduces the area connected to the connecting member 100, disperses the forces in the connection area, reduces the degree of local stress concentration, and effectively reduces the risk of cracking.

[0072] In some embodiments, reference Figure 2 The axis of the inclined beam 123 forms an angle θ with the axis of the first longitudinal beam 121, where 35°≤θ≤55°.

[0073] Understandably, during vehicle operation, welds are weak points in the structure. Due to stress concentration and other reasons, excessive stress can easily cause welds to crack, affecting the safety of the frame.

[0074] In this embodiment, by setting the angle θ between the axis of the inclined beam 123 and the axis of the first longitudinal beam 121 within the range of 35° to 55°, the distribution of the force transmission direction and magnitude at the weld is changed. Actual verification shows that within this angle range, the stress borne by the weld at the connection between the inclined beam 123 and the connecting member 100 is significantly reduced, thus decreasing the risk of weld cracking.

[0075] In some embodiments, reference Figure 2 , Figure 7 The included angle θ satisfies θ = 45°.

[0076] In this embodiment, based on simulation and experimental results, the bottom edge weld of the inclined beam 123 and the connecting member 100 has a high stress risk. Under this risky condition, at the connection edge point C, there exists a first principal stress σ1 along the axis of the inclined beam 123, and a third principal stress σ3 perpendicular to the first principal stress σ1. Furthermore, the profile side of the inclined beam 123 is a thin-walled component, and the second principal stress σ2 = 0. The relationship between the Mises stress σv and the three principal stresses is as follows:

[0077]

[0078] Substituting σ2=0, σ1=P·cosθ, σ3=P·sinθ, we get:

[0079]

[0080] To obtain the optimal tilt angle of the inclined beam, we differentiate σv with respect to θ, when the following condition is met...

[0081]

[0082] Solving for θ, we get θ = 45°. Therefore, when the included angle θ satisfies θ = 45°, it is the optimal tilt angle of the inclined beam obtained from a mechanical perspective.

[0083] By setting the included angle θ to 45°, based on the above mechanical analysis and calculations, the Mises stress σv can reach a relatively optimized state at this angle. Since the bottom edge weld between the inclined beam 123 and the connecting member 100 originally has a high stress risk, this angle setting can effectively reduce the stress concentration at the weld, reduce the possibility of weld cracking and other failures due to excessive stress, and improve the reliability and durability of the weld.

[0084] In some embodiments, reference Figure 2 The front end of the inclined beam 123 is fixedly connected to the connecting member 100; the bottom edge of the front end face of the inclined beam 123 is flush with the bottom edge of the rear side of the connecting member 100.

[0085] In this embodiment, since the bottom edge of the front end face of the inclined beam 123 is flush with the bottom edge of the rear side of the connecting member 100, that is, the front end face of the inclined beam 123 does not protrude from the rear side of the connecting member 100, the force can be evenly distributed on the contact surface between the connecting member 100 and the inclined beam 123 during the transmission process, reducing the situation of local stress concentration.

[0086] In some embodiments, reference Figure 5 The front end of the inclined beam 123 and the front end of the first longitudinal beam 121 are fixed together to the first reinforcing member 130, and the first reinforcing member 130 is fixed to the rear side of the connecting member 100.

[0087] In this embodiment, the front end of the inclined beam 123 and the front end of the first longitudinal beam 121 are jointly fixed to the first reinforcing member 130, enhancing the tightness and strength of the connection between the two. The inclined beam 123 and the first longitudinal beam 121 form a whole for bearing force through the first reinforcing member 130. Compared with the two bearing force individually, the whole bearing force can more effectively disperse and bear external forces, improve the overall load-bearing capacity of the rear frame structure, and reduce local stress concentration.

[0088] In some embodiments, reference Figure 5 The first reinforcing member 130 extends laterally to form a wing plate 131, which is bent longitudinally to cover and fix the inclined beam 123 and the front ends of the first longitudinal beam 121.

[0089] In this embodiment, the wing plate 131 covers and fixes the front ends of the inclined beam 123 and the first longitudinal beam 121, increasing the contact area and connection points between the first reinforcing member 130 and the inclined beam 123 and the first longitudinal beam 121, further improving the connection strength between them, and better resisting the relative displacement between the inclined beam 123 and the first longitudinal beam 121 and the first reinforcing member 130, thus ensuring the stability of the connection.

[0090] In some embodiments, reference Figure 3 , Figure 4 The first longitudinal beam 121 and the second longitudinal beam 122 are fixedly connected by the first fixed beam 124.

[0091] In this embodiment, since the first longitudinal beam 121 and the second longitudinal beam 122 are connected by the first fixed beam 124 to form a whole, the load-bearing capacity and deformation resistance of the frame are improved.

[0092] In some embodiments, reference Figure 1 , Figure 2 The rear frame structure 10 also includes a second reinforcing member 140, which extends from the top side of the connecting member 100 to the top side of the first longitudinal beam 121 and is fixed thereon.

[0093] In this embodiment, since the second reinforcing member 140 extends from the top side of the connecting member 100 to the top side of the first longitudinal beam 121 and is fixed thereon, the number of connection points and the connection area between the connecting member 100 and the first longitudinal beam 121 are increased. This improves the connection strength between the two, better resists deformation and loosening of the connection parts, and ensures the smooth transmission of force between them.

[0094] In some embodiments, reference Figure 3 , Figure 4 The rear frame structure 10 also includes a third reinforcing member 150, which extends from the bottom side of the connecting member 100, through the bottom side of the inclined beam 123, to the bottom side of the second longitudinal beam 122 and is fixed thereon.

[0095] In this embodiment, the third reinforcing member 150 is connected in sequence to the bottom side of the connecting member 100, the inclined beam 123, and the second longitudinal beam 122, which enhances the connection strength between the components of the bottom structure of the frame and enhances the ability of the bottom structure of the frame to resist deformation. This can prevent relative displacement or separation between the components and maintain the stability of the shape of the bottom of the frame.

[0096] In some embodiments, reference Figure 3 , Figure 4 The support member 110 includes a plurality of support beam structures 120 arranged at intervals along the transverse direction. Each support beam structure 120 is located on a longitudinal reference plane, and adjacent support beam structures 120 are connected by a second fixed beam 125.

[0097] In this embodiment, multiple support beam structures 120 arranged laterally at intervals are connected by a second fixed beam 125 to form a wider and more stable support system. Specifically, the first longitudinal beam 121 of one support beam structure 120 is fixedly connected to the first longitudinal beam 121 of another support beam structure 120 by the second fixed beam 125; the diagonal beam 123 of one support beam structure 120 is fixedly connected to the diagonal beam 123 of another support beam structure 120 by the second fixed beam 125; and the second longitudinal beam 122 of one support beam structure 120 is fixedly connected to the second longitudinal beam 122 of another support beam structure 120 by the second fixed beam 125. This expands the support area of ​​the frame, thereby more effectively supporting the vehicle body located behind the hinge point, reducing the burden on individual support beam structures 120, and avoiding structural damage caused by local overload.

[0098] In some embodiments, reference Figure 3 , Figure 4The rear frame structure 10 further includes two side crossbeams 160, which are respectively fixed to the lateral ends of the connecting member 100 and extend in opposite directions. In some embodiments, the frame structure 10 further includes a rear crossbeam 170, located behind the connecting member 100 and connected to the support member 110. The rear crossbeam 170 extends laterally and is fixed to the side crossbeams 160 through a third fixing beam 171. The support member 110 extends longitudinally through the rear crossbeam 170 and is fixed to the rear crossbeam 170.

[0099] In this embodiment, the transverse frame structure formed by the two side crossbeams 160 and the rear crossbeam 170, fixed by the third fixing beam 171, can resist the deformation and sway of the frame in the transverse direction, thus enhancing the stability of the frame in the transverse direction. Furthermore, the frame structure formed by the side crossbeams 160 and the rear crossbeam 170 provides a wide installation base for the floor frame.

[0100] In some embodiments, reference Figure 6 The rear frame structure 10 also includes a floor frame structure 180, which is fixed to the rear of the rear crossbeam 170 and connected to the lateral sides of the support member 110.

[0101] In this embodiment, since the floor frame structure 180 is fixed behind the rear crossbeam 170, the installation position of the floor frame structure 180 can be adjusted by adjusting the longitudinal distance between the rear crossbeam 170 and the connecting member 100. This allows for reasonable adjustment of the floor frame structure 180's position based on the vehicle's underbody clearance, reducing its contact with the ground and lowering the risk of bottoming out.

[0102] In some embodiments, reference Figure 3 , Figure 4 The connecting member 100 is provided with a wire through hole 101 that extends through both the front and rear sides; and / or, the front side of the connecting member 100 has a weight reduction groove 102.

[0103] In articulated vehicles, the electrical wiring between the front and rear bodies needs to be connected to enable vehicle signal transmission and functional control. In this embodiment, the wire through hole 101 provides a fixed passage for the electrical wiring, which protects the wiring from friction and collision with other components of the frame, prevents the wiring from becoming tangled inside the frame, and makes the wiring layout neater and more standardized.

[0104] The design of the weight reduction groove 102 removes some material from the front side of the connecting member 100, reducing the weight of the connecting member 100 and thus reducing the weight of the entire rear frame structure 10.

[0105] Secondly, embodiments of this application provide a vehicle frame assembly, including the rear frame structure 10 of any of the above; further including: a front frame structure for supporting the vehicle body located in front of the hinge point; and a hinge structure connected between the front frame structure and the rear frame structure 10 for realizing the hinge between the front frame structure and the rear frame structure.

[0106] Thirdly, embodiments of this application provide a vehicle including the rear frame structure 10 of any of the above.

[0107] Since the vehicle in this embodiment includes the rear frame structure 10 described above, it also has the effects of the rear frame structure 10 described above.

[0108] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0109] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0110] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0111] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A rear frame structure (10) for a vehicle having an articulated system, characterized in that, include: A connecting member (100) is used for fixed connection with the rear hinge end of the vehicle; A support member (110) is fixedly connected to the connecting member (100) and extends rearward along the longitudinal direction of the vehicle to support the vehicle body located behind the hinge point; The bottom of the support member (110) has a first bottom section (111) and a second bottom section (112) arranged sequentially from front to back along the longitudinal direction of the vehicle. The ground clearance of the first bottom section (111) is greater than that of the second bottom section (112) to form a clearance space (113) below the front end of the rear frame structure (10).

2. The rear frame structure (10) according to claim 1, characterized in that, The ground clearance of the bottom side of the first bottom section (111) is gradually reduced from front to back to form a longitudinally narrowing clearance space (113).

3. The rear frame structure (10) according to claim 2, characterized in that, The bottom side surface of the first bottom section (111) and the bottom side surface of the second bottom section (112) are both planar; The bottom side surface of the first bottom section (111) intersects with the bottom side surface of the second bottom section (112), and the two form an angle α, which satisfies 125°≤α≤145°.

4. The rear frame structure (10) according to claim 1, characterized in that, The front end face of the support member (110) is fixedly connected to the rear side of the connecting member (100); the bottom edge of the front end face of the first bottom section (111) is flush with the bottom edge of the rear side of the connecting member (100), and the bottom side of the first bottom section (111) is continuously transitioned to the bottom side of the connecting member (100).

5. The rear frame structure (10) according to any one of claims 1 to 4, characterized in that, The supporting member (110) includes at least one supporting beam structure (120), the supporting beam structure (120) being located on the same longitudinal reference plane and comprising: The first longitudinal beam (121) is fixedly connected to the connecting member (100) at its front end and extends longitudinally along the vehicle. A second longitudinal beam (122) extends longitudinally along the vehicle; the second longitudinal beam (122) at least partially constitutes the second bottom section (112); An inclined beam (123) is fixedly connected between the connecting member (100) and the second longitudinal beam (122); the inclined beam (123) at least partially constitutes the first bottom section (111).

6. The rear frame structure (10) according to claim 5, characterized in that, The axis of the inclined beam (123) forms an angle θ with the axis of the first longitudinal beam (121), satisfying 35°≤θ≤55°.

7. The rear frame structure (10) according to claim 6, characterized in that, The included angle θ satisfies θ1 = 45°.

8. The rear frame structure (10) according to claim 5, characterized in that, The front end of the inclined beam (123) is fixedly connected to the connecting member (100); the bottom edge of the front end face of the inclined beam (123) is flush with the bottom edge of the rear side of the connecting member (100).

9. The rear frame structure (10) according to claim 8, characterized in that, The front end of the inclined beam (123) and the front end of the first longitudinal beam (121) are fixed together to the first reinforcing member (130), and the first reinforcing member (130) is fixed to the rear side of the connecting member (100).

10. The rear frame structure (10) according to claim 9, characterized in that, The first reinforcing member (130) extends laterally into a wing plate (131), which covers and fixes the inclined beam (123) and the front ends of the first longitudinal beam (121).

11. The rear frame structure (10) according to claim 5, characterized in that, Meet at least one of the following: The first longitudinal beam (121) and the second longitudinal beam (122) are fixedly connected by a first fixed beam (124); Includes a second reinforcing member (140) that extends from the top side of the connecting member (100) to the top side of the first longitudinal beam (121) and is fixed thereon; Includes a third reinforcing member (150), which extends rearward from the bottom side of the connecting member (100) through the bottom side of the inclined beam (123) to the bottom side of the second longitudinal beam (122) and is fixed thereon; It includes multiple support beam structures (120) arranged at intervals in the transverse direction, each support beam structure (120) is located on a longitudinal reference plane, and adjacent support beam structures (120) are connected by a second fixed beam (125).

12. The rear frame structure (10) according to any one of claims 1 to 4, characterized in that, Also includes: Two side beams (160) are fixed to the two transverse ends of the connecting member (100) and extend relative to each other; The rear crossbeam (170) is located behind the connecting member (100) and connected to the supporting member (110). The rear crossbeam (170) extends laterally and is fixed to the side crossbeam (160) through a third fixing beam (171).

13. The rear frame structure (10) according to claim 12, characterized in that, It also includes a floor frame structure (180), which is fixed behind the rear crossbeam (170) and connected to the lateral sides of the support member (110).

14. A vehicle frame assembly, characterized in that, Includes the rear frame structure (10) as described in any one of claims 1 to 13; further includes: The front frame structure is used to support the vehicle body located in front of the articulation point; A hinge structure is connected between the front frame structure and the rear frame structure (10) to realize the hinge between the front frame structure and the rear frame structure (10).

15. A vehicle, characterized in that, Includes the frame assembly as described in claim 14.

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