Car underframe and railway vehicle

Abstract

Provided are a car underframe and a railway vehicle. The car underframe comprises a middle underframe (1) and a pair of end underframes (5); the middle underframe (1) comprises a pair of side beams (2), a plurality of cross beams, hanging seats (3) and supporting frames (4); the pair of side beams (2) and at least two cross beams are provided with the hanging seats (3); the supporting frames (4) are arranged on the cross beams; the pair of end underframes (5) are respectively arranged on two sides of all the cross beams in the longitudinal direction; each end underframe (5) comprises at least two stages of force transmission components; the stages of force transmission components are longitudinally distributed and are connected to the side beams (2); and each stage of force transmission component can transmit a longitudinal load to the pair of side beams (2) and the next stage of force transmission component or the cross beams. The side beams (2) and the cross beams jointly bear the load of an oil tank, the supporting frames (4) bear the load of generator sets, and the cross beams bear the supporting frames (4) and the generator sets, thereby improving the vertical bearing strength of the car underframe; the longitudinal load is transmitted and attenuated by means of the multiple stages of force transmission components, thereby improving the longitudinal bearing strength of the car underframe.

Description

Car body underframe and rail vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311429546.4, filed on October 31, 2023, entitled “Car body underframe and rail vehicle”, which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the technical field of rail vehicles and provides a vehicle body underframe and a rail vehicle. Background Art

[0004] The car body underframe of a rail vehicle must withstand both large longitudinal coupler compression loads and vertical loads from generator sets, fuel tanks, and passengers. This combined longitudinal and vertical loads is the most demanding working condition, placing extremely high demands on the strength design of the car body underframe.

[0005] The underframes of some rail vehicles must withstand a longitudinal coupler compression load of at least 363 tons without permanent deformation or yielding. Furthermore, they must accommodate two generator sets weighing over 5 tons and fuel tanks weighing over 8 tons. However, existing underframes, such as those used for heavy-duty locomotives, can only withstand a longitudinal coupler compression load of approximately 200 tons, only 55% of the required value. Furthermore, their ability to withstand vertical loads is also relatively low, failing to meet these requirements.

[0006] Therefore, how to improve the bearing strength of the vehicle body underframe in the longitudinal and vertical directions has become an important technical problem to be solved by those skilled in the art.

[0007] Summary of the Invention

[0008] An embodiment of the present application provides a vehicle underframe to solve the problem that the vehicle underframe in the prior art does not meet usage requirements and to improve the bearing strength of the vehicle underframe in the longitudinal and vertical directions.

[0009] A first embodiment of the present application provides a vehicle underframe, comprising:

[0010] The middle chassis comprises a pair of side beams, a plurality of cross beams disposed between the pair of side beams, a hanger for suspending the fuel tank, and a support frame for supporting the generator set, wherein the hanger is disposed on the pair of side beams and at least two of the cross beams, and the support frame is disposed on the cross beams;

[0011] A pair of end chassis are respectively arranged on both sides of all the cross beams along the longitudinal direction, and the end chassis include at least two levels of force transmission components. The force transmission components at each level are distributed along the longitudinal direction and are fixedly connected to a pair of the side beams. The force transmission components at each level are configured to be able to transmit the longitudinal load to a pair of the side beams and the force transmission components or the cross beams at the next level.

[0012] According to one embodiment of the present application, the side beam and the cross beam for mounting the hanging seat each have a first support portion and a second support portion, and the first support portion and the second support portion are spaced apart vertically;

[0013] The hanging seat includes:

[0014] The hanging seat body, the second supporting portion is provided with a mounting hole for the hanging seat body to pass through;

[0015] A convex edge is formed on the peripheral side of the hanging seat body, and the convex edge is overlapped with a side of the second supporting portion close to the first supporting portion.

[0016] According to one embodiment of the present application, it further includes:

[0017] The support seat is arranged between the hanging seat and the first supporting portion, and the two ends of the support seat along the vertical direction are respectively in contact with the hanging seat and the first supporting portion.

[0018] According to one embodiment of the present application, the side beam includes:

[0019] The inner side beam and the outer side beam each have the first supporting portion, the second supporting portion and a first side standing portion, the first side standing portion is arranged between the first supporting portion and the second supporting portion, and the inner side beam is located inside the outer side beam;

[0020] A limiting member is provided between the first side stand portion of the inner side beam and the first side stand portion of the outer side beam.

[0021] According to one embodiment of the present application, the end chassis includes four levels of force transmission components, and the four levels of force transmission components are all fixedly connected to a pair of side beams;

[0022] In the fourth-level force transmission components, two adjacent ones are fixedly connected, and in the fourth-level force transmission components, one close to the crossbeam is fixedly connected to the crossbeam.

[0023] According to one embodiment of the present application, the crossbeam includes:

[0024] At least one first crossbeam is provided, the first crossbeam includes a third support portion, a fourth support portion and a pair of second side standing portions, the third support portion and the fourth support portion are distributed in the vertical direction, the pair of second side standing portions are provided between the third support portion and the fourth support portion and are spaced apart along the longitudinal direction, and the dimension of the third support portion in the longitudinal direction is greater than the distance between the pair of second side standing portions;

[0025] And / or, at least one second cross beam is provided, and the cross-sectional shape of the second cross beam along the longitudinal direction is C-shaped.

[0026] According to one embodiment of the present application, it further includes:

[0027] A floor is provided on the middle base frame and the end base frame, and the floor is located on a side of the middle base frame and the end base frame away from the hanging seat.

[0028] According to one embodiment of the present application, the floor comprises:

[0029] A first floor panel is provided on the end chassis, and each end chassis is provided with a first floor panel;

[0030] The second floor is arranged on the middle base frame, and the second floor is arranged between the middle base frame and the supporting frame.

[0031] According to one embodiment of the present application, at least the second floor panel has a corrugated cross-section along the transverse direction.

[0032] A second embodiment of the present application provides a rail vehicle comprising the above-mentioned vehicle body underframe.

[0033] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0034] According to the first embodiment of the present application, a vehicle underframe is provided, comprising a central underframe and a pair of end underframes. The central underframe comprises a pair of side beams, a plurality of cross beams, a hanger, and a support frame. The plurality of cross beams are disposed between the pair of side beams, and the ends of the cross beams are fixedly connected to the side beams. The hangers and the support frame are vertically distributed on either side of the central underframe. The hangers are used to suspend the fuel tank, and the support frame is used to support the generator set. Hangers are provided on each of the pair of side beams and at least two cross beams, with the side beams and cross beams jointly supporting the fuel tank's suspension load. The support frame is provided on the cross beams, supporting the load of the generator set and supporting the support frame and the generator set by the cross beams. The combined arrangement of the hangers and the support frame improves the vertical load-bearing strength of the vehicle underframe. A pair of end underframes are provided on either side of all the cross beams in the longitudinal direction, respectively, to withstand the longitudinal coupler compression load. The end chassis includes at least two levels of force transmission components, each level of which is distributed longitudinally and fixedly connected to a pair of side beams. Each level of force transmission components can transmit the longitudinal load to a pair of side beams and the next level of force transmission components or cross beams. The longitudinal load is transmitted topologically on the vehicle body chassis and is attenuated during each level of transmission, which can reduce the load transmitted to the side beams, allowing the vehicle body chassis to withstand larger longitudinal loads and improve the longitudinal bearing strength of the vehicle body chassis. With such an arrangement, the vehicle body chassis provided by this application integrates the installation structure of the fuel tank and the generator set and the structural design of the end chassis, greatly improving the longitudinal and vertical bearing strength of the vehicle body chassis, so that the vehicle body chassis provided by this application can withstand extremely large loads.

[0035] The rail vehicle provided in accordance with the embodiment of the second aspect of the present application has strong longitudinal and vertical load-bearing capacities, which is conducive to promoting the development of heavy-load locomotives. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in this application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] FIG1 is a schematic structural diagram of a vehicle underframe provided in an embodiment of the present application;

[0038] FIG2 is an enlarged view of I in FIG1;

[0039] FIG3 is a schematic structural diagram of a vehicle underframe (with a hidden floor) provided in an embodiment of the present application;

[0040] FIG4 is an enlarged view of X in FIG3 ;

[0041] Figure 5 is an enlarged view of Y in Figure 3;

[0042] FIG6 is a schematic diagram of the installation structure of the hanging seat provided in an embodiment of the present application;

[0043] FIG7 is a schematic diagram of the connection structure between the hanging seat and the side beam provided in an embodiment of the present application;

[0044] FIG8 is a schematic structural diagram of an end chassis provided in an embodiment of the present application.

[0045] Reference numerals:

[0046] 1. Middle chassis; 2. Side beam; 3. Hanging seat; 4. Support frame; 5. End chassis; 6. First support part; 7. Second support part; 8. Hanging seat body; 9. Flange; 10. Support seat; 11. Inner side beam; 12. Outer side beam; 13. First cross beam; 14. Second cross beam; 15. Floor; 16. First floor; 17. Second floor; 18. Pillow beam; 19. Middle beam; 20. First force transmission component; 21. Second force transmission component; 22. Third force transmission component; 23. Fourth force transmission component; 24. Buffer beam; 25. First traction beam; 26. Second traction beam; 27. Stop beam; 28. Third traction beam; 29. ​​Inclined beam; 30. First special-shaped plate; 31. Second special-shaped plate; 32. Third special-shaped plate; 33. Longitudinal beam. DETAILED DESCRIPTION

[0047] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0049] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0050] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0052] The vehicle body underframe of the present application will be described below with reference to FIG. 1 to FIG. 8 .

[0053] As shown in Figures 1 to 8, an embodiment of the first aspect of the present application provides a vehicle body chassis, including a middle chassis 1 and a pair of end chassis 5.

[0054] For the convenience of explanation, the length direction of the vehicle body frame is regarded as the longitudinal direction, referring to the direction indicated by y in Figure 1, the width direction of the vehicle body frame is regarded as the transverse direction, referring to the direction indicated by x in Figure 1, and the load-bearing direction of the vehicle body frame is regarded as the vertical direction, referring to the direction indicated by z in Figure 1. Among the three directions of longitudinal, transverse and vertical, each two is perpendicular.

[0055] Specifically, the central chassis 1 comprises a pair of side beams 2, multiple cross beams, a hanger 3, and a support frame 4. The pair of side beams 2 are spaced apart in the transverse direction, each extending longitudinally. Multiple cross beams are disposed between the pair of side beams 2, each spaced apart in the longitudinal direction, with their ends fixedly connected to the side beams 2 to form a frame structure.

[0056] The hanging seat 3 and the supporting frame 4 are vertically distributed on both sides of the middle chassis 1. The hanging seat 3 is used to hang the oil tank, and the supporting frame 4 is used to support the generator set.

[0057] A pair of side beams 2 and at least two cross beams are provided with hanging seats 3, and the side beams 2 and the cross beams are used to jointly bear the hanging load of the fuel tank. The hanging seats 3 can be provided on a pair of side beams 2 and two cross beams.

[0058] The structure of the support frame 4 is shown in FIG2 . The support frame 4 is arranged on the crossbeam. The support frame 4 is used to bear the load of the generator set and the crossbeam is used to lift the support frame 4 and the generator set.

[0059] The arrangement of the integrated hanging seat 3 and the supporting frame 4 improves the vertical bearing strength of the vehicle body chassis.

[0060] A pair of end frames 5 are respectively arranged on both sides of all cross beams in the longitudinal direction to bear the longitudinal coupler compression load. The end frames 5 include at least two levels of force transmission components, each of which is distributed in the longitudinal direction and fixedly connected to a pair of side beams 2.

[0061] Specifically, among all the crossbeams of the central chassis 1, there is a gap between the crossbeams at the edges along the longitudinal direction and the ends of the side beams 2. In other words, a certain installation space is reserved between the ends of a pair of side beams 2 for installing the end chassis 5. The various force transmission components of the end chassis 5 are distributed on both sides of all the crossbeams along the longitudinal direction and are located between the pair of side beams 2.

[0062] In the force transmission components of each level, along the direction gradually approaching the crossbeam, there are the first-level force transmission component 20, the second-level force transmission component 21, the third-level force transmission component 22, the fourth-level force transmission component 23...

[0063] Each level of force transmission components is capable of transmitting the longitudinal load to the pair of side beams 2 and the next level of force transmission components or crossbeams. Specifically, the longitudinal coupler compression load first acts on the first level force transmission component 20, which transmits the longitudinal load to the pair of side beams 2 and the second level force transmission component 21. The second level force transmission component 21 transmits the longitudinal load it receives to the pair of side beams 2 and the third level force transmission component 22. The third level force transmission component 22 transmits the longitudinal load it receives to the pair of side beams 2 and the fourth level force transmission component 23. The force transmission component closest to the crossbeam in each level transmits the longitudinal load it receives to the pair of side beams 2 and the crossbeam.

[0064] The longitudinal load is transferred topologically on the vehicle chassis and is attenuated during each stage of transfer, which can reduce the load transferred to the side beam 2, allowing the vehicle chassis to withstand a larger longitudinal load and improving the longitudinal bearing strength of the vehicle chassis.

[0065] With such an arrangement, the vehicle body underframe provided in the embodiment of the present application integrates the mounting structure of the fuel tank and the generator set as well as the structural design of the end underframe 5, which greatly improves the longitudinal and vertical bearing strength of the vehicle body underframe, so that the vehicle body underframe provided in the embodiment of the present application can withstand extremely large loads.

[0066] There are two support frames 4, which are distributed at both ends of the middle chassis 1. The area surrounded by each hanging seat 3 is located between the areas occupied by the two support frames 4, which is conducive to the load balance of the vehicle chassis.

[0067] In the embodiment of the present application, both the side beam 2 and the cross beam for mounting the suspender 3 have a first support portion 6 and a second support portion 7. The first support portion 6 and the second support portion 7 are spaced apart vertically, and the end of the cross beam is located between the first support portion 6 and the second support portion 7 of the side beam 2. The first support portion 6 is located above the second support portion 7, and the second support portion 7 of the side beam 2 is used to support the cross beam. The first support portion 6 and the cross beam are used to support components such as the side wall above the vehicle body chassis.

[0068] The hanger 3 includes a hanger body 8 and a flange 9. The hanger body 8 has a hanging portion such as a hook for hanging the oil tank. The flange 9 is formed on the circumference of the hanger body 8.

[0069] The second support portion 7 is provided with a mounting hole, through which the hanger body 8 can pass. The hanging portion of the hanger body 8 is located below the second support portion 7, and the flange 9 is located above the second support portion 7, with the lower surface of the flange 9 overlapping the upper surface of the second support portion 7.

[0070] In this way, the installation of the hanging seat 3 is achieved through the interaction between the protruding edge 9 and the second supporting portion 7. Compared with directly installing the hanging seat 3 by welding, the residual deformation and welding internal stress caused by welding are avoided, which is beneficial to improving the bearing capacity of the middle chassis 1.

[0071] In the embodiment of the present application, the vehicle body chassis further includes a support seat 10 , which is disposed between the hanging seat 3 and the first support portion 6 , and the two ends of the support seat 10 in the vertical direction respectively abut against the hanging seat 3 and the first support portion 6 .

[0072] By supporting the first support portion 6 through the support seat 10, the influence on the strength of the side beam 2 caused by the setting of the mounting hole can be reduced, and the support seat 10 is pressed against the hanging seat 3, which can improve the stability of the hanging seat 3 and the fuel tank.

[0073] It should be noted that the support base 10 is a boxed structure that can be processed by a casting process. The support base 10 can be provided only on the side beams 2, or on both the side beams 2 and the cross beams, depending on the rigidity and strength requirements of the side beams 2 and the cross beams.

[0074] In some embodiments, the side beam 2 includes an inner side beam 11, an outer side beam 12, and a stopper. The inner side beam 11 and the outer side beam 12 both have the first support portion 6 and the second support portion 7. The inner side beam 11 and the outer side beam 12 also have a first side stand, which is disposed between the first support portion 6 and the second support portion 7. It is understood that the cross-sectional shape of the inner side beam 11 and the outer side beam 12 along the transverse direction is C-shaped.

[0075] The inner side beam 11 is located inside the outer side beam 12, and the inner side beam 11 is fixedly connected to the outer side beam 12. Specifically, the first support portion 6 of the inner side beam 11 is located below the first support portion 6 of the outer side beam 12, the second support portion 7 of the inner side beam 11 is located above the second support portion 7 of the outer side beam 12, and the first side stand portion of the inner side beam 11 and the first side stand portion of the outer side beam 12 are parallel to each other.

[0076] The limiting member is arranged between the first side upright portion of the inner side beam 11 and the first side upright portion of the outer side beam 12. Through the interaction between the limiting member and the first side upright portion of the inner side beam 11 and the interaction between the limiting member and the first side upright portion of the outer side beam 12, the relative positions of the inner side beam 11 and the outer side beam 12 can be positioned in the transverse direction, which facilitates the assembly of the side beam 2 and ensures the transverse size of the side beam 2.

[0077] The end chassis 5 is mainly used to bear the longitudinal coupler compression load to realize the connection and alignment between the car bodies. At the same time, the end chassis 5 integrates almost all the loads of the running gear to realize the connection and force transmission between the running gear and the car body.

[0078] In the embodiment of the present application, the structure of the pair of end chassis 5 is the same, and both include four-level force transmission components, which are fixedly connected to the pair of side beams 2. Among the four-level force transmission components, two adjacent ones are fixedly connected; and among the four-level force transmission components, the one closest to the cross beam is fixedly connected to the cross beam.

[0079] Specifically, the four-stage force transmission components are a first-stage force transmission component 20, a second-stage force transmission component 21, a third-stage force transmission component 22 and a fourth-stage force transmission component 23, and the specific structure is shown in FIG8.

[0080] The primary force transmission component 20 includes a buffer beam 24, a first traction beam 25, a second traction beam 26, and a stop beam 27. The buffer beam 24 and the stop beam 27 both extend transversely, while the first traction beam 25 and the second traction beam 26 both extend longitudinally. A pair of first traction beams 25 and second traction beams 26 are provided, with the pair of first traction beams 25 arranged transversely, and the pair of second traction beams 26 arranged transversely on either side of the pair of first traction beams 25. The first traction beam 25 and the second traction beam 26 are both located between the buffer beam 24 and the stop beam 27. The first traction beam 25 is fixedly connected to the buffer beam 24 and the stop beam 27 at both ends, respectively, while the second traction beam 26 is fixedly connected to the buffer beam 24 and the first traction beam 25.

[0081] Among them, the first traction beam 25 is a box-type structure formed by a U-shaped beam and a web, the second traction beam 26 is a box-type structure formed by a longitudinal beam, an upper cover plate and a lower cover plate, the buffer beam 24 is a partial box-type structure formed by three U-shaped structures, and the stop beam 27 is a U-shaped bent structure.

[0082] The third-stage force transmission component 22 includes a bolster 18, and the second-stage force transmission component 21 includes a third traction beam 28, a diagonal beam 29, and a first special-shaped plate 30. The third traction beam 28 extends longitudinally and is provided in pairs. The third traction beams 28 are arranged transversely, with their ends fixedly connected to the stop beam 27 and the bolster 18, respectively. A pair of diagonal beams 29 are provided, with the pair transversely arranged on either side of the pair of third traction beams 28. The diagonal beams 29 are fixedly connected to the stop beam 27, the third traction beam 28, and the side beam 2. A pair of first special-shaped plates 30 are provided, with the pair transversely arranged on either side of the pair of third traction beams 28. The first special-shaped plates 30 are fixedly connected to the diagonal beam 29, the bolster 18, and the side beam 2.

[0083] The third traction beam 28 is a box-shaped structure formed by a U-shaped beam and a web, while the diagonal beam 29 is a box-shaped structure formed by a diagonal beam and a web. The bolster 18 is an integrated structure, integrating the bolster web and the lower cover plate. This significantly reduces welding, avoids weld fatigue, simplifies manufacturing, and improves construction efficiency.

[0084] The fourth-stage force transmission component 23 includes a second special-shaped plate 31, a third special-shaped plate 32, an intermediate beam 19, and longitudinal beams 33. The intermediate beam 19 extends transversely, and the longitudinal beams 33 extend longitudinally. A pair of longitudinal beams 33 are provided, distributed transversely and fixedly connected to the intermediate beam 19. A pair of second special-shaped plates 31 are provided between the bolster 18 and the intermediate beam 19. The pair of second special-shaped plates 31 are distributed transversely on either side of the pair of longitudinal beams 33 and fixedly connected to the bolster 18, the side beams 2, and the intermediate beam 19. A pair of third special-shaped plates 32 are provided between the intermediate beam 19 and the transverse beam. The pair of third special-shaped plates 32 are distributed transversely on either side of the pair of longitudinal beams 33 and fixedly connected to the intermediate beam 19, the side beams 2, and the transverse beam.

[0085] The longitudinal beam 33 is a U-shaped structure formed by bending plate. The second and third special-shaped plates 31 and 32 are special-shaped structures machined from plate to conform to the force transmission path, effectively meeting the requirements for force transmission. The intermediate beam 19 is a variable-section box beam composed of a web, upper cover, and lower cover. It not only meets the load-bearing requirements but also provides sufficient space for bogie movement. The lower surface of the intermediate beam 19 is equipped with a traction rod device, which is cast to meet the strength requirements for longitudinal impact.

[0086] In the embodiment of the present application, different cross-sections are set for the crossbeams at different positions according to the different load-bearing requirements at different positions of the vehicle body chassis. On the premise of meeting the stiffness requirements, the mass of the crossbeams is reduced as much as possible to ensure the weight requirements of the vehicle body chassis.

[0087] The cross beam includes a first cross beam 13 and / or a second cross beam 14 . The vehicle body underframe may include only the first cross beam 13 , only the second cross beam 14 , or both the first cross beam 13 and the second cross beam 14 .

[0088] At least one first crossbeam 13 is provided. The first crossbeam 13 includes a third support portion, a fourth support portion, and a pair of second side upright portions. The third and fourth support portions are vertically distributed, and the pair of second side upright portions are disposed between the third and fourth support portions and spaced longitudinally. The longitudinal dimension of the third support portion is greater than the distance between the pair of second side upright portions, thereby increasing the support width of the crossbeam.

[0089] At least one second cross beam 14 is provided, and the cross-section of the second cross beam 14 along the longitudinal direction is C-shaped.

[0090] For beams with high load-bearing requirements, such as beams for installing the hanging seat 3 and beams for installing the supporting frame 4, the requirements for the stiffness and strength of the beams are relatively high, and the first beam 13 is suitable for selection. The third support portion of the first beam 13 can also increase the contact area with the supporting frame 4.

[0091] For beams at other positions, the load-bearing requirements, rigidity and strength requirements of the beams are relatively low, and the second beam 14 is suitable for selection.

[0092] In the embodiment of the present application, the vehicle body chassis further includes a floor 15 , which is provided on the middle chassis 1 and the end chassis 5 . The floor 15 is located on a side of the middle chassis 1 and the end chassis 5 away from the suspension seat 3 .

[0093] Specifically, the floor 15 includes a first floor 16 and a second floor 17. The first floor 16 is provided on the end chassis 5, and each end chassis 5 is equipped with a first floor 16. The second floor 17 is provided on the middle chassis 1, and is located between the middle chassis 1 and the support frame 4.

[0094] Specifically, the bolster 18 of the end chassis 5 can be used as a dividing line, the portion between the bolsters 18 of a pair of end chassis 5 is the second floor 17 , and the portion located at the bolster 18 away from the middle chassis 1 is the first floor 16 .

[0095] At least the cross section of the second floor panel 17 along the transverse direction is corrugated. The corrugated shape is beneficial to increasing the cross-sectional area of ​​the second floor panel 17 and improving the anti-buckling ability of the second floor panel 17.

[0096] Specifically, a corrugated floor can be selected as the second floor 17 .

[0097] The first floor 16 is arranged in sections, with the section near the middle chassis 1 being arranged to be corrugated, and a corrugated floor can be selected, while the section away from the middle chassis 1 being arranged to be straight, and a flat floor can be selected.

[0098] The setting of the flat floor can ensure the installation of end walls and other auxiliary components.

[0099] Through a large number of tests and verifications, it has been shown that, under the condition of the same material, the longitudinal and vertical load-bearing capacity of the vehicle body underframe provided in the embodiment of the present application has been greatly improved, and the vehicle body underframe provided in the embodiment of the present application can indeed meet the strength requirements required for the complex working conditions consisting of an ultra-large longitudinal load of 363 tons and a vertical load of 20 tons.

[0100] A second embodiment of the present application provides a rail vehicle comprising the above-mentioned vehicle body underframe.

[0101] The rail vehicle provided in accordance with the embodiment of the second aspect of the present application has strong longitudinal and vertical load-bearing capacities, which is conducive to promoting the development of heavy-load locomotives.

[0102] The rail vehicle provided in the second embodiment of the present application may be a high-speed train, an EMU, an urban rail, etc.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle body underframe, comprising: The middle chassis comprises a pair of side beams, a plurality of cross beams arranged between the pair of side beams, a hanging seat for hanging the oil tank and a supporting frame for supporting the generator set, the hanging seats are arranged on the pair of side beams and at least two of the cross beams, and the supporting frame is arranged on the cross beams; A pair of end frames are respectively arranged on both sides of all the cross beams along the longitudinal direction, and the end frames include at least two levels of force transmission components. The force transmission components of each level are distributed along the longitudinal direction and are fixedly connected to a pair of side beams. Each level of the force transmission components is configured to be able to transmit the longitudinal load to a pair of side beams and the force transmission components of the next level or the cross beams.

2. The vehicle body underframe according to claim 1, wherein: The side beam and the cross beam for mounting the hanging seat both have a first supporting portion and a second supporting portion, and the first supporting portion and the second supporting portion are spaced apart vertically; The hanging seat comprises: The second support portion is provided with a mounting hole for the hanging seat body to penetrate; A convex edge is formed on the peripheral side of the hanging seat body, and the convex edge is overlapped with a side of the second supporting part close to the first supporting part.

3. The vehicle body underframe according to claim 2, further comprising: The support seat is arranged between the hanging seat and the first support part, and two ends of the support seat along the vertical direction are respectively abutted against the hanging seat and the first support part.

4. The vehicle body underframe according to claim 2, wherein: The side beam comprises: The inner side beam and the outer side beam each have the first supporting portion, the second supporting portion and a first side standing portion, wherein the first side standing portion is arranged between the first supporting portion and the second supporting portion, and the inner side beam is located inside the outer side beam; A limiting member is arranged between the first side standing portion of the inner side beam and the first side standing portion of the outer side beam.

5. The vehicle body underframe according to any one of claims 1 to 3, wherein: The end chassis comprises four levels of force transmission components, and the four levels of force transmission components are all fixedly connected to a pair of side beams; Among the force transmission components of the fourth level, two adjacent ones are fixedly connected, and among the force transmission components of the fourth level, one close to the cross beam is fixedly connected to the cross beam.

6. The vehicle body underframe according to any one of claims 1 to 3, wherein: The crossbeam comprises: At least one first cross beam is provided, the first cross beam comprises a third support portion, a fourth support portion and a pair of second side standing portions, the third support portion and the fourth support portion are distributed in the vertical direction, the pair of second side standing portions are provided between the third support portion and the fourth support portion and are distributed at intervals in the longitudinal direction, and the dimension of the third support portion in the longitudinal direction is greater than the distance between the pair of second side standing portions; And / or, at least one second cross beam is provided, and the cross-sectional shape of the second cross beam along the longitudinal direction is C-shaped.

7. The vehicle body underframe according to any one of claims 1 to 3, further comprising: A floor is arranged on the middle base frame and the end base frame, and the floor is located on a side of the middle base frame and the end base frame away from the hanging seat.

8. The vehicle body underframe according to claim 7, wherein: The floor comprises: A first floor panel is arranged on the end chassis, and each end chassis is equipped with a first floor panel; The second floor is arranged on the middle base frame, and the second floor is arranged between the middle base frame and the supporting frame.

9. The vehicle body underframe according to claim 8, wherein: At least the second floor panel has a corrugated cross section along the transverse direction.

10. A rail vehicle comprising the vehicle body underframe according to any one of claims 1 to 9.

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