Tail transverse beam of passenger car, frame and passenger car

Abstract

This utility model provides a rear crossbeam, a frame, and a bus, relating to the field of passenger vehicles. The bus includes a frame, which includes a rear crossbeam. The rear crossbeam includes a main structure for connecting the left and right longitudinal beams of the frame. The main structure includes a top plate, a bottom plate, a rear upright plate, a left side plate, and a right side plate. The top plate and bottom plate are respectively connected to the top and bottom ends of the rear upright plate. The left and right side plates are respectively connected to both ends of the rear upright plate. The top ends of the left and right side plates are connected to the top plate, and the bottom ends are connected to the bottom plate. An inner upright plate is provided within a forward-opening cavity formed by the top plate, bottom plate, rear upright plate, left side plate, and right side plate. The top and bottom ends of the inner upright plate are respectively connected to the top plate and bottom plate, and the left and right ends of the inner upright plate are respectively connected to the left and right side plates. The rear crossbeam strengthens its bending resistance at the connection point with the longitudinal beams, preventing stress concentration and fatigue failure caused by engine vibration at the connection point.

Description

Technical Field

[0001] This utility model belongs to the field of passenger vehicles, and in particular relates to a rear crossbeam, frame and bus of a passenger vehicle. Background Technology

[0002] A passenger bus is a commercial vehicle capable of carrying nine or more people and their personal luggage. Passenger buses are typically rear-wheel drive, meaning the engine is mounted at the rear of the bus frame. The frame is a frame structure spanning the front and rear axles of the vehicle, generally composed of longitudinal beams and multiple crossbeams. The longitudinal beams include two beams, a left longitudinal beam and a right longitudinal beam, spaced apart along the vehicle's direction of travel. Multiple crossbeams are spaced apart along the length of the vehicle and connected between the left and right longitudinal beams to ensure the frame's torsional rigidity and withstand longitudinal loads, while also supporting the vehicle's main components.

[0003] Among them, the tail beam refers to the beam connected to the rear of the longitudinal beam and adjacent to the rear of the engine. Due to the large size and mass of the engine and its high vibration frequency, coupled with the influence of rotational inertia, stress concentration and fatigue failure are prone to occur at the connection between the tail beam and the two longitudinal beams.

[0004] To enhance the strength of the rear crossbeam while ensuring sufficient space for engine installation, Chinese utility model patent CN217260280U discloses a rear crossbeam, a frame, and a bus. The rear crossbeam includes a main body comprising a front plate, a top plate, a bottom plate, a first side plate, and a second side plate. The top plate and bottom plate are connected to the top and bottom edges of the front plate, respectively, and both extend towards the front of the frame. The top plate is recessed into the bottom plate, and its orthographic projection onto the bottom plate falls within the coverage area of ​​the bottom plate. The first and second side plates are connected to both ends of the front plate, with their bottom ends connected to both ends of the bottom plate, and their top ends connected to both ends of the top plate. Additionally, two first reinforcing members and one second reinforcing member are connected to the front side of the front plate, both supporting the connection between the top plate and the bottom plate. Specifically, the second reinforcing member is located in the central area of ​​the front plate, and the first reinforcing member is located on both sides of the second reinforcing member, in order to improve the rigidity of the central area of ​​the tail beam body, improve the overall structural strength of the tail beam, and enhance the bending and torsional rigidity of the tail beam.

[0005] The aforementioned tail beam increases the space between the tail beam and the two longitudinal beams by reducing the area of ​​the top plate. Support is formed between the top and bottom plates by the first and second side plates, and the stiffness and bending stiffness of the central area of ​​the tail beam are improved by the first and second reinforcing members, thereby meeting the engine's space and reliability requirements. However, the first and second reinforcing members are only located in the middle area of ​​the front plate, and the first and second side plates are directly connected to the longitudinal beams. Once the first and second side plates deform, engine vibration will directly cause stress concentration at the connection point between the first and second side plates and the longitudinal beams, leading to fatigue failure of the connection between the tail beam and the longitudinal beams. Utility Model Content

[0006] The purpose of this invention is to provide a rear crossbeam for a passenger vehicle, thereby solving the technical problem in the prior art where stress concentration easily occurs at the connection point between the rear crossbeam and the longitudinal beam of the rear-wheel-drive passenger vehicle frame, leading to fatigue failure at the connection point. Another purpose of this invention is to provide a vehicle frame and a passenger vehicle to solve the same technical problem.

[0007] To achieve the above objectives, the technical solution for the rear crossbeam of the bus provided by this utility model is as follows: A rear crossbeam for a passenger bus includes a main structure for connecting the left and right longitudinal beams of the vehicle frame. The main structure includes a top plate, a bottom plate, a rear upright plate, and a left side plate and a right side plate for connecting the left and right longitudinal beams of the vehicle frame, respectively. The top plate and the bottom plate are respectively connected to the top and bottom ends of the rear upright plate. The left side plate and the right side plate are respectively connected to the two ends of the rear upright plate, and the top ends of the left side plate and the right side plate are respectively connected to the top plate. The top plate, the bottom plate, the rear upright plate, the left side plate, and the right side plate form a cavity with an opening facing forward. An inner upright plate is provided in the cavity, and the top and bottom ends of the inner upright plate are respectively connected to the top plate and the bottom plate. The left and right ends of the inner upright plate are respectively connected to the left side plate and the right side plate.

[0008] This utility model is an improved invention, and its beneficial effects are as follows: the top and bottom ends of the inner vertical plate are respectively supported and connected between the top plate and the bottom plate, and the left and right ends of the inner vertical plate are respectively supported and connected between the left side plate and the right side plate. This strengthens the vibration resistance of the rear crossbeam in the vertical and vehicle width directions, improves the bending stiffness of the rear crossbeam in the vertical and vehicle width directions, strengthens the overall strength of the rear crossbeam, and improves the deformation resistance of the left and right side plates. This helps to strengthen the connection strength between the left and right side plates and the frame longitudinal beams, reduce the stress at the connection points of the left and right side plates and the frame longitudinal beams, and does not occupy extra space, thus meeting the space requirements of the engine.

[0009] As a further improvement, at least one side of the main structure is equipped with a reinforcing structure.

[0010] As a further improvement, the reinforcing structure includes an L-shaped plate connected to the top of the top plate. The L-shaped plate has a horizontal section and a vertical section. The L-shaped plate is connected to the top plate through the horizontal section, and the vertical section is used to connect to the left or right longitudinal beam corresponding to the side of the main structure where the reinforcing structure is configured.

[0011] As a further improvement, the horizontal section of the L-shaped plate extends forward beyond the top plate, and the portion of the horizontal section that extends beyond the top plate constitutes the top stiffener.

[0012] As a further improvement, vertical reinforcing ribs connect the horizontal and vertical sections of the L-shaped plate.

[0013] As a further improvement, the reinforcing structure includes a bottom stiffener extending horizontally from the plate surface, which connects the bottom end of the base plate to the left or right side plate corresponding to the side of the main structure where the reinforcing structure is configured.

[0014] As a further improvement, the reinforcement structure includes a central stiffening plate extending horizontally across the panel, which connects the front end of the inner vertical panel to the left or right side panel corresponding to the side of the main structure where the reinforcement structure is configured.

[0015] As a further improvement, the inner and tail uprights are provided with at least one pair of connecting holes arranged in pairs, and at least one pair of connecting holes is connected by a longitudinal reinforcing beam.

[0016] As a further improvement, a pair of connecting holes are connected to trailer hooks, and the portion of the trailer hooks located between the inner upright plate and the tail upright plate constitutes the longitudinal reinforcing beam.

[0017] As a further improvement, the top plate is concave in shape, with a lower middle and higher ends.

[0018] To achieve the above objectives, the technical solution for the vehicle frame provided by this utility model is as follows: A vehicle frame includes a left longitudinal beam, a right longitudinal beam, and a rear crossbeam connected to the rear ends of the left and right longitudinal beams. The rear crossbeam includes a main structure connected between the left and right longitudinal beams of the frame. The main structure includes a top plate, a bottom plate, a rear upright plate, and a left side plate and a right side plate respectively connected to the left and right longitudinal beams of the frame. The top plate and the bottom plate are respectively connected to the top and bottom ends of the rear upright plate. The left side plate and the right side plate are respectively connected to the two ends of the rear upright plate, and the top ends of the left side plate and the right side plate are respectively connected to the top plate. The bottom ends of the left side plate and the right side plate are respectively connected to the bottom plate. The top plate, the bottom plate, the rear upright plate, the left side plate, and the right side plate form a cavity with an opening facing forward. An inner upright plate is provided in the cavity, and the top and bottom ends of the inner upright plate are respectively connected to the top plate and the bottom plate. The left and right ends of the inner upright plate are respectively connected to the left side plate and the right side plate.

[0019] This utility model is an improved invention, and its beneficial effects are as follows: the top and bottom ends of the inner vertical plate are respectively supported and connected between the top plate and the bottom plate, and the left and right ends of the inner vertical plate are respectively supported and connected between the left side plate and the right side plate. This strengthens the vibration resistance of the rear crossbeam in the vertical and vehicle width directions, improves the bending stiffness of the rear crossbeam in the vertical and vehicle width directions, strengthens the overall strength of the rear crossbeam, and improves the deformation resistance of the left and right side plates. This helps to strengthen the connection strength between the left and right side plates and the frame longitudinal beams, reduce the stress at the connection points of the left and right side plates and the frame longitudinal beams, and does not occupy extra space, thus meeting the space requirements of the engine.

[0020] As a further improvement, at least one side of the main structure is equipped with a reinforcing structure.

[0021] As a further improvement, the reinforcing structure includes an L-shaped plate connected to the top of the top plate. The L-shaped plate has a horizontal section and a vertical section. The L-shaped plate is connected to the top plate through the horizontal section and the vertical section is connected to the left or right longitudinal beam on the side of the main structure where the reinforcing structure is configured.

[0022] As a further improvement, the horizontal section of the L-shaped plate extends forward beyond the top plate, and the portion of the horizontal section that extends beyond the top plate constitutes the top stiffener.

[0023] As a further improvement, vertical reinforcing ribs connect the horizontal and vertical sections of the L-shaped plate.

[0024] As a further improvement, the reinforcing structure includes a bottom stiffener extending horizontally from the plate surface, which connects the bottom end of the base plate to the left or right side plate corresponding to the side of the main structure where the reinforcing structure is configured.

[0025] As a further improvement, the reinforcement structure includes a central stiffening plate extending horizontally across the panel, which connects the front end of the inner vertical panel to the left or right side panel corresponding to the side of the main structure where the reinforcement structure is configured.

[0026] As a further improvement, the inner and tail uprights are provided with at least one pair of connecting holes arranged in pairs, and at least one pair of connecting holes is connected by a longitudinal reinforcing beam.

[0027] As a further improvement, a pair of connecting holes are connected to trailer hooks, and the portion of the trailer hooks located between the inner upright plate and the tail upright plate constitutes the longitudinal reinforcing beam.

[0028] As a further improvement, the top plate is concave in shape, with a lower middle and higher ends.

[0029] To achieve the above objectives, the technical solution for the passenger vehicle provided by this utility model is as follows: A bus includes a frame, which includes a left longitudinal beam, a right longitudinal beam, and a rear crossbeam connected to the rear ends of the left and right longitudinal beams. The rear crossbeam includes a main structure connected between the left and right longitudinal beams of the frame. The main structure includes a top plate, a bottom plate, a rear upright plate, and a left side plate and a right side plate that are respectively connected to the left and right longitudinal beams of the frame. The top plate and the bottom plate are respectively connected to the top and bottom ends of the rear upright plate. The left side plate and the right side plate are respectively connected to the two ends of the rear upright plate, and the top ends of the left side plate and the right side plate are respectively connected to the bottom plate. The top plate, the bottom plate, the rear upright plate, the left side plate, and the right side plate form a cavity with an opening facing forward. An inner upright plate is provided in the cavity, and the top and bottom ends of the inner upright plate are respectively connected to the top plate and the bottom plate. The left and right ends of the inner upright plate are respectively connected to the left side plate and the right side plate.

[0030] This utility model is an improved invention, and its beneficial effects are as follows: the top and bottom ends of the inner vertical plate are respectively supported and connected between the top plate and the bottom plate, and the left and right ends of the inner vertical plate are respectively supported and connected between the left side plate and the right side plate. This strengthens the vibration resistance of the rear crossbeam in the vertical and vehicle width directions, improves the bending stiffness of the rear crossbeam in the vertical and vehicle width directions, strengthens the overall strength of the rear crossbeam, and improves the deformation resistance of the left and right side plates. This helps to strengthen the connection strength between the left and right side plates and the frame longitudinal beams, reduce the stress at the connection points of the left and right side plates and the frame longitudinal beams, and does not occupy extra space, thus meeting the space requirements of the engine.

[0031] As a further improvement, at least one side of the main structure is equipped with a reinforcing structure.

[0032] As a further improvement, the reinforcing structure includes an L-shaped plate connected to the top of the top plate. The L-shaped plate has a horizontal section and a vertical section. The L-shaped plate is connected to the top plate through the horizontal section and the vertical section is connected to the left or right longitudinal beam on the side of the main structure where the reinforcing structure is configured.

[0033] As a further improvement, the horizontal section of the L-shaped plate extends forward beyond the top plate, and the portion of the horizontal section that extends beyond the top plate constitutes the top stiffener.

[0034] As a further improvement, vertical reinforcing ribs connect the horizontal and vertical sections of the L-shaped plate.

[0035] As a further improvement, the reinforcing structure includes a bottom stiffener extending horizontally from the plate surface, which connects the bottom end of the base plate to the left or right side plate corresponding to the side of the main structure where the reinforcing structure is configured.

[0036] As a further improvement, the reinforcement structure includes a central stiffening plate extending horizontally across the panel, which connects the front end of the inner vertical panel to the left or right side panel corresponding to the side of the main structure where the reinforcement structure is configured.

[0037] As a further improvement, the inner and tail uprights are provided with at least one pair of connecting holes arranged in pairs, and at least one pair of connecting holes is connected by a longitudinal reinforcing beam.

[0038] As a further improvement, a pair of connecting holes are connected to trailer hooks, and the portion of the trailer hooks located between the inner upright plate and the tail upright plate constitutes the longitudinal reinforcing beam.

[0039] As a further improvement, the top plate is concave in shape, with a lower middle and higher ends. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the rear crossbeam of the bus according to the present invention. Figure 2 This is an exploded view of an embodiment of the rear crossbeam of the passenger vehicle according to this utility model; Figure 3 This is a partial structural schematic diagram of an embodiment of the vehicle frame of this utility model.

[0041] Explanation of reference numerals in the attached figures: 1. Top plate; 2. Bottom plate; 3. Tail upright plate; 4. Left side plate; 5. Right side plate; 6. Inner upright plate; 7. L-shaped plate; 8. Vertical reinforcing rib plate; 9. Bottom rib plate; 10. Middle rib plate; 11. Connecting hole; 12. Left longitudinal beam; 13. Right longitudinal beam; 14. Trailer hook. Detailed Implementation

[0042] To address the technical problem in existing technology where stress concentration easily occurs at the connection point between the rear crossbeam and longitudinal beam of a rear-wheel-drive bus frame, leading to fatigue failure at the connection point, the basic technical concept of this utility model is: by strengthening the strength near the connection point between the rear crossbeam and the longitudinal beam of the frame, deformation of the end of the rear crossbeam is prevented, thereby preventing stress concentration and fatigue failure at the connection point between the rear crossbeam and the longitudinal beam due to engine vibration.

[0043] The present invention will be further described in detail below with reference to the embodiments.

[0044] The specific implementation method of the rear crossbeam of the bus provided by this utility model is as follows: like Figure 1 , Figure 2 and Figure 3As shown, the rear crossbeam of the bus includes a main structure and a reinforcing structure. The rear crossbeam connects to the left and right longitudinal beams of the frame, typically using bolts. Specifically, the main structure includes a top plate 1, a bottom plate 2, a rear upright plate 3, and left and right side plates 4 and 5 for connecting the rear crossbeam to the left and right longitudinal beams 12 and 13, respectively. The rear edges of the top plate 1 and bottom plate 2 are connected to the top and bottom of the rear upright plate 3, respectively. The left and right side plates 4 and 5 are connected to both ends of the rear upright plate 3, with their tops connected to the top plate 1 and their bottoms connected to the bottom plate 2. Furthermore, the top plate 1, bottom plate 2, rear upright plate 3, left and right side plates 4 and 5 are all fixedly connected by welding. The inner upright plate 6 and the rear upright plate 3 also have clearance holes to allow for the passage of wiring harnesses or other components.

[0045] Unlike existing technologies, the top plate 1, bottom plate 2, tail plate 3, left side plate 4, and right side plate 5 together form a cavity with an opening facing forward. An inner plate 6 is installed inside the cavity. The top and bottom ends of the inner plate 6 are connected to the top plate 1 and the bottom plate 2, respectively, and the left and right ends of the inner plate 6 are connected to the left side plate 4 and the right side plate 5, respectively.

[0046] Compared with existing technologies, the inner vertical plate 6 is supported and connected at both ends between the top plate 1 and the bottom plate 2, which can strengthen the strength of the rear crossbeam in the vertical direction to prevent deformation of the top plate 1 and the bottom plate 2 and enhance the vibration resistance of the rear crossbeam. The left and right ends of the inner vertical plate 6 are supported and connected between the left side plate 4 and the right side plate 5, which can strengthen the strength of the rear crossbeam in the vehicle width direction to prevent deformation of the left side plate 4 and the right side plate 5 and enhance the bending stiffness of the rear crossbeam in the vehicle width direction. This helps to strengthen the connection strength between the left side plate 4 and the right side plate 5 and the frame longitudinal beam, reduce the stress at the connection points of the left side plate 4 and the left longitudinal beam 12 of the frame, and the right side plate 5 and the right longitudinal beam 13 of the frame, and prevent fatigue failure. At the same time, the inner vertical plate 6 is connected in the cavity formed by the top plate 1, the bottom plate 2, the rear vertical plate 3, the left side plate 4 and the right side plate 5, and does not need to occupy additional space near the rear crossbeam, thus meeting the space requirements of the engine.

[0047] Preferably, while ensuring the strength of the rear crossbeam, the middle area of ​​the top plate 1 adopts a sunken structure, that is, the top plate 1 has a concave structure that is low in the middle and high at both ends. Correspondingly, the tops of the rear vertical plate 3 and the inner vertical plate 6 are also adapted to the shape of the top plate 1. The advantage of this setting is that the top height of the middle area of ​​the rear crossbeam is relatively low, which can both reduce the weight of the rear crossbeam and provide a collision avoidance effect in the length direction and within a certain width range of the vehicle. Since the engine is mounted on the frame located in front of the rear crossbeam, and the engine has a large size and mass, the sunken structure can increase the distance between the engine and the rear crossbeam, preventing the engine from impacting the rear crossbeam and reducing the impact of engine vibration on the rear crossbeam.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, with the opening direction of the cavity as the front, a reinforcing structure is provided at the right end of the main structure. Specifically, the reinforcing structure includes an L-shaped plate 7, which comprises a horizontal section and a vertical section that are perpendicular to each other. The horizontal section is connected to the right end of the top of the top plate 1, and the vertical section is connected to the right longitudinal beam 13 of the frame. Preferably, a through hole is provided in the horizontal section, through which the L-shaped plate 7 is welded to the top right end of the top plate 1. Bolt holes are provided in the vertical section, through which the L-shaped plate 7 is bolted to the right longitudinal beam 13 of the frame.

[0049] The L-shaped plate 7 directly connects the top of the main structure to the right longitudinal beam 13 of the frame, increasing the number of connection points between the main structure and the right longitudinal beam 13 of the frame, enhancing the connection strength between the rear crossbeam and the right longitudinal beam 13 of the frame, and reducing the stress at the connection point between the top area of ​​the right side plate 5 and the right longitudinal beam 13 of the frame, thereby strengthening the reliability of the connection between the top area of ​​the right side plate 5 and the right longitudinal beam 13 of the frame and preventing fatigue failure.

[0050] Of course, in other embodiments, depending on the stress conditions of the left side plate 4 and the right side plate 5, the reinforcing structure may also be configured at the left end of the tail beam, or the left and right ends of the tail beam may be configured with reinforcing structures at the same time.

[0051] Based on the above embodiment, a vertical reinforcing rib plate 8 connects the horizontal and vertical sections of the L-shaped plate 7. Preferably, as shown... Figure 1 and Figure 2 As shown, the vertical reinforcing rib plate 8 is a right-angled triangular plate. The two perpendicular right-angled sides of the triangle are connected to the horizontal and vertical sections of the L-shaped plate 7 by welding. The advantage of setting the vertical reinforcing rib plate 8 is that it can support the horizontal and vertical sections of the L-shaped plate 7, thereby enhancing the deformation resistance of the L-shaped plate 7, strengthening the bending stiffness of the rear crossbeam along the vehicle width direction, reducing the stress at the connection between the L-shaped plate 7 and the right longitudinal beam 13 of the frame, and enhancing the reliability of the connection between the L-shaped plate 7 and the right longitudinal beam 13 of the frame.

[0052] In other embodiments, the vertical stiffening rib may be a trapezoidal plate or other shapes. When the vertical stiffening rib is a trapezoidal plate, the two sides of the trapezoid are connected to the horizontal and vertical sections of the L-shaped plate 7, respectively. The upper and lower bases of the trapezoid serve as diagonal braces between the horizontal and vertical sections of the L-shaped plate 7 to enhance the deformation resistance of the L-shaped plate 7, thereby improving the reliability of the connection between the L-shaped plate 7 and the longitudinal beam of the frame.

[0053] Based on the above embodiment, the horizontal section of the L-shaped plate 7 extends forward beyond the top plate 1, and the portion of the horizontal section extending beyond the top plate 1 constitutes a top stiffener. Preferably, as shown... Figure 1 , Figure 2 and Figure 3 As shown, the horizontal section of the L-shaped plate 7 (which can be understood as the projection of the L-shaped plate 7 onto the horizontal plane) is in the shape of a right trapezoid. The plate surface where the sloping waist of the right trapezoid is located faces forward and extends beyond the leading edge of the top plate 1, forming a triangular support structure in front of the top plate 1. This triangular support structure constitutes the top stiffener of the tail crossbeam. The advantage of setting a triangular support structure for the L-shaped plate 7 is that the triangular support structure is a stable support structure, and the top stiffener is supported between its vertical section and the vertical reinforcing stiffener 8, which can strengthen the support strength of the vertical section, further enhance the deformation resistance of the vertical section of the L-shaped plate 7, thereby strengthening the bending stiffness of the tail crossbeam along the vehicle width direction, reducing the stress at the connection position between the L-shaped plate 7 and the right longitudinal beam 13 of the frame, and strengthening the reliability of the connection between the L-shaped plate 7 and the right longitudinal beam 13 of the frame.

[0054] Of course, in other embodiments, the top stiffener may be a right trapezoid or other shape, as long as it can support the vertical section of the L-shaped plate 7 and the vertical reinforcing stiffener 8.

[0055] Based on the above embodiments, the reinforcing structure further includes a bottom stiffening plate 9 extending horizontally across the plate surface. The bottom stiffening plate 9 is connected to the right end of the bottom of the base plate 2 and the right side plate 5. Preferably, as shown... Figure 1 , Figure 2 and Figure 3 As shown, the bottom stiffener 9 is a right-angled trapezoidal plate, with the inclined side of the trapezoid facing forward and extending beyond the base plate 2. Specifically, the bottom stiffener 9 has through holes, and the upper end of the bottom stiffener 9 is welded to the base plate 2 through the through holes. The right end of the bottom stiffener 9 is welded to the right side plate 5. The inclined side of the right-angled trapezoid, together with the front plate surface of the base plate 2 and the left plate surface of the right side plate 5, forms a triangle.

[0056] Since the bottom stiffener 9 is connected to the bottom plate 2, and the contact area between the bottom stiffener 9 and the right side plate 5 is larger than the contact area between the bottom plate 2 and the right side plate 5, the bottom stiffener 9 can provide some support for the bottom plate 2, thereby ensuring the reliability of the connection between the bottom plate 2 and the right side plate 5. At the same time, considering that the front part of the right side plate 5 protrudes beyond the inner vertical plate 6, the triangular part of the bottom stiffener 9 that extends beyond the bottom plate 2 can also support the front part of the right side plate 5 that extends beyond the inner vertical plate 6. This can strengthen the deformation resistance of the bottom area of ​​the right side plate 5, thereby strengthening the bending stiffness of the rear crossbeam along the vehicle width direction, reducing the stress at the connection point between the bottom area of ​​the right side plate 5 and the right longitudinal beam 13 of the frame, and strengthening the reliability of the connection between the right side plate 5 and the right longitudinal beam 13 of the frame.

[0057] Based on the above embodiments, the reinforcing structure further includes a central stiffening rib 10 extending horizontally across the panel surface, the central stiffening rib 10 connecting the inner vertical panel 6 and the right side panel 5. Preferably, as shown... Figure 1 , Figure 2 and Figure 3 As shown, the central stiffening plate 10 is a right-angled triangular plate, with the two right-angled sides of the triangle connected to the front end face of the inner vertical plate 6 and the inner end face of the right side plate 5, respectively. The central stiffening plate 10, supported between the right side plate 5 and the inner vertical plate 6, strengthens the deformation resistance of the central region of the right side plate 5, thereby enhancing the bending stiffness of the rear crossbeam along the vehicle width direction, reducing the stress at the connection point between the central region of the right side plate 5 and the right longitudinal beam 13 of the frame, and improving the reliability of the connection between the right side plate 5 and the right longitudinal beam 13 of the frame.

[0058] In this embodiment, through simulation analysis, the rear crossbeam effectively enhances the lateral strength of the rear crossbeam in the vehicle width direction by setting the L-shaped plate 7, the middle stiffener 10 and the bottom stiffener 9, reducing the stress at the connection position between the rear crossbeam and the frame longitudinal beam by 45%, effectively solving the problem of fatigue failure of the connection structure between the rear crossbeam and the frame longitudinal beam due to engine vibration.

[0059] Based on the above embodiment, the inner upright plate 6 and the tail upright plate 3 are provided with at least one pair of connecting holes 11 arranged in a front-to-back configuration, and at least one pair of connecting holes 11 is connected by a longitudinal reinforcing beam. Preferably, as shown in the figure... Figure 1 , Figure 2 and Figure 3As shown, the inner upright plate 6 and the rear upright plate 3 are each provided with three connecting holes 11 spaced apart along the width direction of the vehicle. Each pair of coaxial connecting holes 11 on the inner upright plate 6 and the rear upright plate 3 forms a pair, meaning the inner upright plate 6 and the rear upright plate 3 have three pairs of connecting holes 11 arranged in front and behind. A tow hook 14 is connected to the pair of connecting holes 11 closest to the left side plate 4. The connecting holes 11 not only reduce weight but also serve to install the tow hook 14. After the rear crossbeam integrates the tow hook 14, the tow hook 14 not only enables towing but also strengthens the bending stiffness of the rear crossbeam in the width direction of the vehicle. This helps prevent deformation of the left side plate 4 of the rear crossbeam when the vehicle turns. Furthermore, the strengthened bending stiffness in the width direction also helps reduce stress at the connection point between the left side plate 4 and the left longitudinal beam 12 of the frame, enhancing the reliability of the connection between the right side plate 5 and the left longitudinal beam 12 of the frame.

[0060] In this embodiment, the rear crossbeam is strengthened by the inner vertical plate 6, L-shaped plate 7, vertical reinforcing rib plate 8, middle rib plate 10, bottom rib plate 9, and trailer hook 14 as a longitudinal reinforcing beam. This strengthens the bending stiffness of the left side plate 4 and right side plate 5 in the vehicle width direction, reduces the stress at the connection point with the frame longitudinal beam, and effectively avoids fatigue failure of the connection structure between the rear crossbeam and the frame longitudinal beam.

[0061] Based on the above embodiments, the inner upright plate 6 and the rear upright plate 3 can also be fitted with reinforcing sleeves on the aligned connection holes 11, and multiple reinforcing sleeves can be installed. The hollow reinforcing sleeves, as longitudinal reinforcing beams, can effectively improve the bending stiffness in the vehicle width direction with a small increase in weight, thereby reducing the stress at the connection position between the rear crossbeam and the frame longitudinal beam, and effectively preventing fatigue failure of the connection structure between the rear crossbeam and the frame longitudinal beam.

[0062] In other embodiments, depending on the stress conditions of the left side plate 4 and the right side plate 5, when the reinforcing structure is configured at the left end of the tail crossbeam, the trailer hook 14 can be installed near the right side plate 5 of the tail crossbeam to enhance the overall strength of the tail crossbeam and ensure the bending stiffness of both ends of the tail crossbeam. Alternatively, when both the left and right ends of the tail crossbeam are equipped with reinforcing structures, the trailer hook 14 can be installed on any two coaxial connecting holes 11 on the inner upright plate 6 and the tail upright plate 3, preferably on the two coaxial connecting holes 11 located in the middle.

[0063] Based on the above implementation method, several weight-reducing holes are also provided on the rear upright plate 3 and the inner upright plate 6 to reduce the weight of the rear crossbeam and the frame, which helps to make the vehicle lighter.

[0064] Specific embodiments of the vehicle frame provided by this utility model: like Figure 3As shown, the frame includes a left longitudinal beam 12 and a right longitudinal beam 13 spaced apart along the width of the vehicle. A tail crossbeam is connected between the rear ends of the left longitudinal beam 12 and the right longitudinal beam 13. The tail crossbeam is implemented as described in any of the embodiments of the tail crossbeam of the bus described above, and will not be further explained here.

[0065] Specific implementation method of the bus provided by this utility model: A passenger vehicle includes a frame, the frame including a left longitudinal beam and a right longitudinal beam spaced apart along the width of the vehicle, and a tail crossbeam connecting the rear ends of the left and right longitudinal beams. The tail crossbeam is implemented as described in any of the embodiments of the tail crossbeam of the passenger vehicle described above, and will not be further described here.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rear crossbeam for a passenger bus, comprising a main structure for connecting two longitudinal beams on the left and right sides of a vehicle frame, the main structure including a top plate, a bottom plate, a rear upright plate, and a left side plate and a right side plate for respectively connecting the two longitudinal beams on the left and right sides of the vehicle frame, the top plate and the bottom plate respectively connecting the top and bottom ends of the rear upright plate, the left side plate and the right side plate respectively connecting the two ends of the rear upright plate, and the top ends of the left side plate and the right side plate respectively connecting to the top plate, the characteristic being that... The top plate, bottom plate, tail plate, left side plate, and right side plate form a cavity with an opening facing forward. An inner plate is installed inside the cavity, and the top and bottom ends of the inner plate are connected to the top plate and the bottom plate, respectively. The left and right ends of the inner plate are connected to the left side plate and the right side plate, respectively.

2. The rear crossbeam of the passenger vehicle according to claim 1, characterized in that, The main structure is reinforced on at least one side.

3. The rear crossbeam of the passenger vehicle according to claim 2, characterized in that, The reinforcing structure includes an L-shaped plate connected to the top of the top plate. The L-shaped plate has a horizontal section and a vertical section. The L-shaped plate is connected to the top plate through the horizontal section, and the vertical section is used to connect to the left or right longitudinal beam corresponding to the side of the main structure where the reinforcing structure is configured.

4. The rear crossbeam of the passenger vehicle according to claim 3, characterized in that, The horizontal section of the L-shaped slab extends forward beyond the top slab, and the portion of the horizontal section that extends beyond the top slab constitutes the top stiffener.

5. The rear crossbeam of the passenger vehicle according to claim 3, characterized in that, Vertical reinforcing ribs connect the horizontal and vertical sections of the L-shaped plate.

6. The rear crossbeam of the passenger vehicle according to any one of claims 2-5, characterized in that, The reinforcing structure includes a bottom stiffener extending horizontally from the plate surface, which connects the bottom end of the base plate to the left or right side plate corresponding to the side of the main structure where the reinforcing structure is configured.

7. The rear crossbeam of the passenger vehicle according to any one of claims 2-5, characterized in that, The reinforcing structure includes a central stiffening plate extending horizontally across the panel, which connects the front end of the inner vertical panel to the left or right side panel corresponding to the side of the main structure where the reinforcing structure is configured.

8. The rear crossbeam of the passenger vehicle according to any one of claims 2-5, characterized in that, The inner and tail uprights are provided with at least one pair of connecting holes arranged in pairs, and at least one pair of connecting holes is connected by a longitudinal reinforcing beam.

9. The rear crossbeam of the passenger vehicle according to claim 8, characterized in that, A pair of connecting holes are connected to trailer hooks, and the portion of the trailer hooks located between the inner upright plate and the tail upright plate constitutes the longitudinal reinforcing beam.

10. The rear crossbeam of the passenger vehicle according to claim 1 or 2, characterized in that, The top plate is concave in shape, with a lower middle section and higher ends.

11. A frame comprising a left longitudinal beam, a right longitudinal beam, and a rear crossbeam connected to the rear ends of the left and right longitudinal beams, characterized in that, The tail crossbeam is the tail crossbeam of the bus as described in any one of claims 1-10.

12. A passenger bus, comprising a frame, a left longitudinal beam, a right longitudinal beam, and a rear crossbeam connected to the rear ends of the left and right longitudinal beams, characterized in that, The tail crossbeam is the tail crossbeam of the bus as described in any one of claims 1-10.

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