A chassis and rail vehicle

Abstract

This application provides a chassis for a rail vehicle and the rail vehicle itself. The chassis includes end beams, side beam assemblies, traction buffers, inner traction floor panels, and outer traction floor panels. The end beams include a primary end beam and a secondary end beam. Two side beam assemblies are respectively connected to the end beams, extending longitudinally along the chassis and spaced apart. The traction buffers are divided into a primary traction buffer and a secondary traction buffer, both connected to the end beams. The inner traction floor panels connect the two traction buffers. The outer traction floor panels are respectively disposed on both sides of the primary and secondary traction buffers, and are located between the two side beam assemblies. The end beams, side beam assemblies, and traction buffers constitute a frame structure with high rigidity and strength, establishing a basic path for longitudinal load transfer to meet collision performance requirements.

Description

Technical Field

[0001] This application relates to the field of rail transit technology, and in particular to a rail vehicle chassis and rail vehicle. Background Technology

[0002] In related technologies, the body structure of rail vehicles mainly includes the underframe structure, side wall structure, roof structure, and end wall structure, among which the underframe structure is the main load-bearing structure of the body. The rail vehicle body includes a lead car and intermediate cars, with the lead car containing the driver's cab structure.

[0003] With the promotion and development of rail vehicles, rail vehicles need to meet higher requirements for vehicle collision performance, multiple-unit operation, and equal-spaced side door arrangement. However, for rail vehicles that meet the requirements for multiple-unit operation and equal-spaced side doors, the longitudinal space occupied by the opening and closing mechanism and bogie cannot be increased by increasing the collision space of the driver's cab or improving the structural strength of the collision interface to meet the design requirements. Summary of the Invention

[0004] In view of this, embodiments of this application aim to provide a chassis for a rail vehicle with high rigidity, effectively improving the collision performance of the rail vehicle. This application also provides a rail vehicle to meet operational requirements.

[0005] This application provides a chassis for a rail vehicle, including: end beams, side beam assemblies, traction sleepers, inner sleeper floor and outer sleeper floor, wherein the end beams include a single end beam and a second end beam.

[0006] The two side beam assemblies are respectively connected to the first end beam and the second end beam, and extend longitudinally along the base frame and are spaced apart.

[0007] The traction buffer includes a coupler seat, a traction beam, and a bolster beam. The coupler seat is connected to the traction beam, and the traction beam is connected to the bolster beam. The traction buffer is divided into a single-position traction buffer and a double-position traction buffer. In the single-position traction buffer, the coupler seat is connected to the first end beam, and the bolster beam is positioned between and connected to the two side beam assemblies. In the double-position traction buffer, the coupler seat is connected to the second end beam, and the bolster beam is positioned between and connected to the two side beam assemblies.

[0008] The inner floor of the pillow connects the first traction pillow buffer and the second traction pillow buffer, and is disposed between the two side beam assemblies and connected to the two side beam assemblies.

[0009] The outer floor of the pillow is provided on both sides of the first and second traction pillow buffers. The two ends of the outer floor of the pillow are respectively connected to the corresponding end beam and the corresponding pillow beam, and are located between the two side beam assemblies.

[0010] In some embodiments, the first end beam includes a profile with double cavities, the stacking direction of the double cavities of the first end beam being along the longitudinal direction of the base frame.

[0011] In some embodiments, the hook seat of the first traction pillow is joined and connected to the inner cavity of the first end beam near the outer floor of the pillow.

[0012] In some embodiments, the base frame includes a first transition structure disposed at the connection between the first end beam and the outer floor of the pillow.

[0013] In some embodiments, the first end beam further includes an anti-climb device mounting interface for installing an anti-climb device, and two anti-climb device mounting interfaces are arranged laterally along the underframe on both sides of the coupler seat of the first end traction bolster.

[0014] In some embodiments, the base frame includes a first reinforcing structure distributed on both sides of the first traction pillow, located behind the anti-climb device mounting interface. The first reinforcing structure includes a first reinforcing plate, a second reinforcing plate, and a first reinforcing rib. The first reinforcing rib connects the first end beam and the outer floor of the pillow. The first reinforcing plate stands sideways on the first end beam, with its opposite ends connected to the first reinforcing rib and the side beam assembly, respectively. The second reinforcing plate leans against the first end beam, connecting the first end beam and the outer floor of the pillow.

[0015] In some embodiments, the first reinforcing structure further includes a third reinforcing plate, which stands sideways on the first end beam, with its opposite ends connected to the first traction pillow to ease the first reinforcing bar.

[0016] In some embodiments, each traction beam further includes an upper cover plate and a lower cover plate. Each traction beam includes two upper traction beams and two lower traction beams, which are arranged laterally at intervals along the underframe. The lower cover plate connects the two lower traction beams and covers at least a portion of the lower traction beams. The upper cover plate is embedded between the two upper traction beams and connects the two upper traction beams.

[0017] In some embodiments, each of the bolster beams further includes an anti-roll torsion bar seat and an anti-hunting mounting seat. Each bolster beam includes a front bolster beam and a rear bolster beam, which are arranged adjacent to each other along the longitudinal direction of the base frame. The front bolster beam is connected to the outer floor of the bolster, and the rear bolster beam is connected to the inner floor of the bolster. The anti-roll torsion bar seat is arranged transversely along the base frame at both ends of the front bolster beam, and the anti-hunting mounting seat is arranged transversely along the base frame at both ends of the rear bolster beam.

[0018] In some embodiments, each of the traction beams further includes a second reinforcing structure, the second reinforcing structure including a fourth reinforcing plate, and two fourth reinforcing plates are sandwiched between each of the upper traction beams and each of the lower traction beams, the two fourth reinforcing plates being arranged laterally at intervals along the base frame.

[0019] In some embodiments, each of the traction pillows is connected to the outer floor of the pillow, and the upper surface of the upper traction beam is flush with the upper plane of the outer floor of the pillow.

[0020] In some embodiments, each of the bolster beams includes a front bolster beam and a rear bolster beam, which are arranged adjacent to each other along the longitudinal direction of the base frame. The front bolster beam is connected to the outer floor of the bolster, and the rear bolster beam is connected to the inner floor of the bolster. The upper surfaces of both the front and rear bolster beams are flush with the upper surface of the upper traction beam.

[0021] In some embodiments, each of the traction pillows further includes a third reinforcing structure, the third reinforcing structure including a fifth reinforcing plate, the fifth reinforcing plate being connected to the pillow beam, sandwiched between the two lower traction beams, and connected to the two lower traction beams.

[0022] In some embodiments, the third reinforcing structure further includes a sixth reinforcing plate, which is disposed at the outer corner where the traction beam connects to the bolster beam, and is connected to both the bolster beam and the lower traction beam.

[0023] In some embodiments, the upper cover plate of the first traction pillow buffer is a single-layer plate, and the upper cover plate of the second traction pillow buffer is a profile with a cavity.

[0024] In some embodiments, each of the traction pillows further includes a second transition structure disposed at the connection between the rear pillow beam and the pillow floor.

[0025] In some embodiments, each of the traction pillows further includes a fourth reinforcing structure, which includes a seventh reinforcing plate, an eighth reinforcing plate, and a second reinforcing rib. The seventh reinforcing plate is connected to the second transition structure and is attached to the lower plane of the pillow inner floor. The eighth reinforcing plate is a bent plate, which is connected to one end of the rear pillow beam near the pillow inner floor and bent towards the pillow inner floor. The second reinforcing rib is embedded between the seventh reinforcing plate and the bent plate and is connected to the rear pillow beam.

[0026] In some embodiments, both the upper traction beam and the lower traction beam include an open profile, and the open profile of the upper traction beam has a double cavity, the double cavities being arranged adjacent to each other in the transverse direction of the base frame, the wall thickness of the outer cavity closer to the outer floor is less than the wall thickness of the inner cavity farther from the outer floor.

[0027] In some embodiments, the two-position traction buffer further includes a third transition structure, which is disposed at the connection between the traction beam of the two-position traction buffer and the coupler seat of the two-position traction buffer.

[0028] In some embodiments, the underframe further includes longitudinal beams, and the two ends of the coupler seats of the two traction heads are respectively connected to the two longitudinal beams. The longitudinal beams are connected to the two end beams. The two longitudinal beams are arranged along the longitudinal direction of the underframe, and the distance between the connection points on the two end beams is greater than the distance between the connection points on the coupler seats.

[0029] In some embodiments, each of the longitudinal beams includes a lower longitudinal beam, an upper longitudinal beam, and a vertical plate. The upper longitudinal beam is spliced ​​and connected to the outer floor of the pillow, and the upper surface of the upper longitudinal beam is flush with the upper plane of the outer floor of the pillow. The upper longitudinal beam is connected to the vertical plate, and the vertical plate stands on the upper longitudinal beam. The vertical plate is connected to the lower longitudinal beam. The outer floor of the pillow includes a connecting plate, and the two upper longitudinal beams are connected by the connecting plate.

[0030] This application provides a chassis for a rail vehicle, the chassis including end beams, side beam assemblies, a traction buffer, an inner traction floor, and an outer traction floor. The end beams, side beam assemblies, and traction buffer constitute a frame structure with high rigidity and strength, establishing the basic path for longitudinal load transfer to meet collision performance requirements.

[0031] This application also provides a rail vehicle including the aforementioned underframe to meet operational requirements. Attached Figure Description

[0032] Figure 1 This is a structural schematic diagram of a chassis according to one or more embodiments, wherein the dashed lines are break lines;

[0033] Figure 2 This is a partial schematic diagram of one end of a chassis according to one or more embodiments;

[0034] Figure 3 According to Figure 2 A partial schematic diagram of one end of the chassis from another perspective;

[0035] Figure 4 This is a schematic diagram of the traction buffer structure of the underframe according to one or more embodiments;

[0036] Figure 5 A transverse sectional view of a traction buffer of a chassis according to one or more embodiments;

[0037] Figure 6 This is a longitudinal sectional view of the chassis according to one or more embodiments;

[0038] Figure 7 This is a partial schematic diagram of the two ends of a chassis according to one or more embodiments;

[0039] Figure 8 A transverse cross-sectional view of the two ends of the chassis according to one or more embodiments;

[0040] Figure 9 A transverse cross-sectional view of the two-position traction buffer of the underframe according to one or more embodiments;

[0041] Figure 10 This is a longitudinal cross-sectional view of the two ends of the chassis according to one or more embodiments.

[0042] Explanation of reference numerals in the attached figures

[0043] Base frame 1;

[0044] End beam 10; Single-position end beam 11; Two-position end beam 12; Anti-climb device installation interface 101;

[0045] Side beam assembly 20;

[0046] Traction pillow buffer 30; First traction pillow buffer 31; Second traction pillow buffer 32; Coupler seat 301; Traction beam 302; Upper traction beam 3021; ​​Lower traction beam 3022; Upper cover plate 3023; Lower cover plate 3024; Pillow beam 303; Front pillow beam 3031; Rear pillow beam 3032; Anti-roll torsion bar seat 3033; Anti-hunting mounting seat 3034; Second transition structure 304; Second reinforcing structure 305; Fourth reinforcing plate 3051; Third reinforcing structure 306; Fifth reinforcing plate 3061; Sixth reinforcing plate 3062; Fourth reinforcing structure 307; Seventh reinforcing plate 3071; Eighth reinforcing plate 3072; Second reinforcing rib 3073; Third transition structure 308;

[0047] The floor inside the pillow is 40 cm high.

[0048] External floor 50; connecting plate 501;

[0049] First transition structure 60;

[0050] First reinforcing structure 70; First reinforcing plate 701; Second reinforcing plate 702; Third reinforcing plate 703; First reinforcing rib 704;

[0051] Longitudinal beam 80; Upper longitudinal beam 801; Lower longitudinal beam 802; Vertical slab 803. Detailed Implementation

[0052] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0053] In the description of the embodiments of this application, it should be noted that the terms "longitudinal," "lateral," "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0055] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "specific example," or "specifically," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] With the development of public transport-style operation of rail vehicles, higher requirements have been placed on vehicle collision performance, multiple-unit operation, and equidistant side door arrangements. However, to meet these requirements, the remaining design space is limited due to the longitudinal space occupied by the opening and closing mechanism and bogies, making it impossible to meet performance requirements by increasing the driver's side collision space or improving the strength of the collision interface structure. This application fully utilizes the designable space of the rail vehicle's underframe to provide a structural solution for the underframe that meets these performance requirements.

[0058] This application provides a chassis 1 for a rail vehicle. Please refer to... Figure 1 The base frame 1 includes end beams 10, side beam assemblies 20, traction pillows 30, inner pillow floor 40, and outer pillow floor 50.

[0059] It should be noted that in the field of rail transit, the direction in which the rail vehicle travels is often referred to as the longitudinal direction, and the direction perpendicular to the longitudinal direction is referred to as the transverse direction. Please refer to [reference needed]. Figure 1 The longitudinal and lateral directions of base frame 1 are indicated by arrows, referring to the aforementioned general knowledge. Additionally, please refer to... Figure 2 and Figure 3 The terms "upper" and "lower" refer to the vertical direction, which is the normal direction of the plane containing the longitudinal and transverse axes of the base frame 1. Unless otherwise specified, the descriptions in the remaining figures and the specification are based on the above definition of direction.

[0060] To facilitate understanding of the technical solution of this application, since the internal structure of the base frame 1 is difficult to see in its normal assembled state, the base frame 1 is inverted in some of the accompanying drawings. However, the description in the specification is still based on the relative positions of the components of the base frame 1 in its normal assembled state.

[0061] The end beam 10 includes a first end beam 11 and a second end beam 12. Two side beam assemblies 20 are respectively connected to the first end beam 11 and the second end beam 12, extending longitudinally along the base frame 1 and spaced apart.

[0062] The terms "one-position end" and "two-position end" mentioned above are directional descriptions that can be understood by those skilled in the art. Different rail vehicles have different marking rules, and the specific rules include one of the following:

[0063] (1) The end of the car body in this section equipped with the fully automatic coupler is a single end;

[0064] (2) The end of the car body in this section that is equipped with the electrical equipment cabinet is a single terminal;

[0065] (3) The end of the piston rod of the brake cylinder in this section is the locating end;

[0066] (4) The end of this section of the car body that points to the lead car or driver's cab is the first end;

[0067] The other end opposite to the aforementioned first end is the second end. Unless otherwise specified, the descriptions of "first end beam" or "first traction bolster" in this application refer to the first end; similarly, unless otherwise specified, the descriptions of "second end beam" or "second traction bolster" refer to the second end.

[0068] Please refer to Figure 2 and Figure 6 The traction buffer 30 includes a coupler seat 301, a traction beam 302, and a bolster beam 303. The coupler seat 301 is connected to the traction beam 302, and the traction beam 302 is connected to the bolster beam 303. The traction buffer 30 is divided into a single-position traction buffer 31 and a double-position traction buffer 32. The coupler seat 301 of the single-position traction buffer 31 is connected to the single-position end beam 11, and the bolster beam 303 is disposed between and connected to the two side beam assemblies 20. The coupler seat 301 of the double-position traction buffer 32 is connected to the double-position end beam 12, and the bolster beam 303 is disposed between and connected to the two side beam assemblies 20.

[0069] The inner floor 40 connects the first traction pillow buffer 31 and the second traction pillow buffer 32, and is positioned between and connected to the two side beam assemblies 20. The outer floor 50 connects to the end beam 10. The outer floor 50 is provided on both sides of the first traction pillow buffer 31 and the second traction pillow buffer 32, and is connected to the pillow beam 303 of the traction pillow buffer 30 and positioned between the two side beam assemblies 20.

[0070] In this embodiment, the end beam 10, the side beam assembly 20, and the bolster 30 constitute a frame structure with high rigidity and strength, establishing the basic path for longitudinal load transfer. The inner bolster floor 40 can be made of longitudinally corrugated metal flooring, which has strong resistance to deformation in both the lateral and vertical directions. As a component occupying a large area in the base frame 1, it can absorb and buffer stress. The outer bolster floor 50 can be a flat floor to allow space for the installation of other necessary components.

[0071] In some embodiments, please refer to Figure 2 One end beam 11 includes a profile with a double-layer cavity, and the stacking direction of the double-layer cavity of the one end beam 11 is along the longitudinal direction of the base frame 1.

[0072] The profile refers to a structural component with a certain geometric cross-section formed by rolling, extrusion or casting of a material with certain strength and toughness. In order to reduce the weight of the structural component, the profile is not a solid cross-section, but has a cavity cross-section with some specific shapes, such as rectangle or triangle.

[0073] It should be noted that, unless otherwise specified, all profiles described in this manual have the above-described structure.

[0074] The profiles are classified into open profiles and closed profiles based on whether their cross-sectional outer contours are closed. Open profiles can effectively reduce the overall weight of the structure and achieve lightweight design. Double-cavity profiles include profiles with a design cross-section of double cavities, or profiles formed by stacking two profiles with single-cavity sections.

[0075] One end beam 11 serves as a supporting structural component on the base frame 1. The double-cavity profile has good resistance to deformation and a large amount of deformation after being damaged, thus achieving a stronger collapse energy absorption effect.

[0076] In some embodiments, please refer to Figure 3 One end beam 11 is a double-cavity profile, and the coupler seat 301 of one traction pillow buffer 31 is spliced ​​and connected to the inner cavity of one end beam 11 near the outer floor 50 of the pillow. The specific connection method includes butt welding connection.

[0077] In some embodiments, please refer to Figure 2 The base frame 1 includes a first transition structure 60, which is located at the connection between the first end beam 11 and the outer floor 50. The outer floor 50 is a flat floor made of a single-cavity profile, while the first end beam 11 is a double-cavity profile. When stress is transmitted from the first end beam 11 to the outer floor 50, the profile cross-sectional shape changes significantly, interrupting the continuity of the cross-sectional geometry, which can cause stress concentration or even structural damage.

[0078] Therefore, the first transition structure 60 should satisfy the requirement that its cross-sectional shape can enhance the continuity of the cross-sectional geometry at this connection, avoiding abrupt changes in cross-sectional shape, or possess a certain stiffness to smooth the abrupt change in stiffness from the end beam 11 to the outer floor 50. For example, the first transition structure 60 can be a profile with a cavity, the wall thickness of which is between the wall thickness of the profile of the end beam 11 and the outer floor 50. In addition, the first transition structure 60 can also be a structural component made of materials with different stiffnesses; any structure that can smooth the change in stiffness can be adaptively applied to this connection.

[0079] In some embodiments, please refer to Figure 2 The end beam 11 also includes an anti-creep device mounting interface 101, which is used to install the anti-creep device. Two anti-creep device mounting interfaces 101 are arranged on both sides of the coupler seat 301 of the first traction bolster 31 along the transverse direction of the underframe 1. The aforementioned anti-creep device refers to a passive safety protection device on rail vehicles, which can be used to absorb collision energy.

[0080] In some embodiments, the base frame 1 further includes a first reinforcing structure 70, which is disposed behind the anti-climb device mounting interface 101. The term "behind" refers to the installation direction of the anti-climb device, and the anti-climb device mounting interface 101 extends along one end of the installation direction of the anti-climb device. The first reinforcing structure 70 includes a first reinforcing plate 701, a second reinforcing plate 702, and a first reinforcing rib 704. The first reinforcing rib 704 connects the first end beam 11 and the outer floor 50. The first reinforcing plate 701 stands sideways on the first end beam 11, and its opposite ends are connected to the first reinforcing rib 704 and the side beam assembly 20, respectively. The second reinforcing plate 702 leans against the first end beam 11 and connects the first end beam 11 and the outer floor 50.

[0081] The first reinforcing structure 70 also includes a third reinforcing plate 703, which stands on one end beam 11 and is connected to the opposite ends of a traction pillow 31 and the first reinforcing bar 704, respectively.

[0082] One end beam 11 serves as the structure for installing the anti-climb device, providing support for the anti-climb device. In particular, when one end beam 11 is a profile with a double-layer cavity, it provides stronger support.

[0083] The following situations may occur when a rail vehicle is in operation: during normal operation, the coupler seat 301 is subjected to longitudinal tensile or compressive loads; in the event of a collision, the compressive load reaches its maximum, and the coupler seat 301 is the first to be impacted. If the collision is still ongoing, the anti-climb device will start to work and take effect, for example, the anti-climb teeth will engage, and the energy-absorbing element will start to act to absorb the collision energy.

[0084] A first reinforcing structure 70 is installed behind the anti-climb device mounting interface 101 to support the first end beam 11, thereby suppressing the longitudinal deformation of the first end beam 11 under collision load and guiding the transmission direction of the longitudinal load. The improved deformation resistance of the first end beam 11 provides stronger support for the anti-climb device, resulting in better energy absorption. A third reinforcing plate 703 connects the first traction buffer 31 to the first reinforcing rib 704, alleviating deformation and stress concentration at the connection between the first end beam 11 and the coupler seat 301 when the coupler seat 301 bears longitudinal compressive load.

[0085] In some embodiments, please refer to Figure 4 Each traction beam 302 also includes an upper cover plate 3023 and a lower cover plate 3024. Please refer to [reference needed]. Figure 4 and Figure 5Each traction beam 302 includes two upper traction beams 3021 and two lower traction beams 3022. The two upper traction beams 3021 and the two lower traction beams 3022 are arranged at transverse intervals along the base frame 1. The lower cover plate 3024 connects the two lower traction beams 3022 and covers at least a portion of the lower traction beams 3022. The upper cover plate 3023 is embedded between the two upper traction beams 3021 and connects the two upper traction beams 3021.

[0086] In some embodiments, please refer to Figure 4 Each sleeper beam 303 also includes an anti-roll torsion bar seat 3033 and an anti-hunting mounting seat 3034. The anti-roll torsion bar seat 3033 is used to install the anti-roll torsion bar and is part of the anti-roll system; the anti-hunting mounting seat 3034 is used to install the anti-hunting damper.

[0087] Please refer to Figure 1 and Figure 4 Each bolster beam 303 includes a front bolster beam 3031 and a rear bolster beam 3032. The front bolster beam 3031 and the rear bolster beam 3032 are arranged adjacent to each other along the longitudinal direction of the base frame 1. The front bolster beam 3031 is connected to the outer floor 50 of the bolster, and the rear bolster beam 3032 is connected to the inner floor 40 of the bolster. The anti-roll torsion bar seat 3033 is arranged at both ends of the front bolster beam 3031 along the transverse direction of the base frame 1, and the anti-hunting mounting seat 3034 is arranged at both ends of the rear bolster beam 3032 along the transverse direction of the base frame 1.

[0088] In some embodiments, please refer to Figure 5 Each traction pillow 30 also includes a second reinforcing structure 305, which includes a fourth reinforcing plate 3051. Each upper traction beam 3021 and each lower traction beam 3022 are sandwiched with two fourth reinforcing plates 3051, which are arranged at a lateral interval along the base frame.

[0089] In some embodiments, each traction pillow 30 is spliced ​​with the outer pillow floor 50, and the upper surface of the upper traction beam 3021 is flush with the upper plane of the outer pillow floor 50.

[0090] Specifically, the lower traction beam 3022 and the upper traction beam 3021 are connected by two fourth reinforcing plates 3051 to form a box girder structure. In order to increase the cross-sectional dimensions of the traction beam 302 and improve its longitudinal bearing capacity and bending resistance, the upper surface of the upper traction beam 3021 is designed to be flush with the upper surface of the outer floor 50.

[0091] In related technologies, the outer floor 50 is fitted and attached to the traction beam 302. This design increases the vertical dimension of the traction beam 302 by the thickness of the original outer floor. It is understandable that the design of the traction beam 30 and the outer floor 50 being joined and flush not only increases the cross-sectional dimensions of the traction beam 302 but also alters the longitudinal load or stress transmission path on the base frame 1. For example, more stress can be transmitted through the traction beam 302.

[0092] In some embodiments, please refer to Figure 5 Both the upper traction beam 3021 and the lower traction beam 3022 include open-type profiles, and the open-type profile of the upper traction beam 3021 has a double cavity, which refers to two cavities arranged adjacent to each other in the transverse direction of the base frame 1. The wall thickness of the outer cavity closer to the outer floor 50 is less than the wall thickness of the inner cavity farther from the outer floor 50. This creates a unequal stiffness arrangement at the connection between the upper traction beam 3021 and the outer floor 50, smoothing out the stiffness change and enhancing the continuity of the cross-sectional geometry. During welding, this effectively reduces the stress value at the connection and alleviates stress concentration.

[0093] In some embodiments, please refer to Figure 4 Each traction pillow 30 also includes a third reinforcing structure 306, which includes a fifth reinforcing plate 3061. The fifth reinforcing plate 3061 is connected to the front pillow beam 3031, sandwiched between the two lower traction beams 3022, and connected to the two lower traction beams.

[0094] In some embodiments, the third reinforcing structure 306 further includes a sixth reinforcing plate 3062, which is disposed at the outer corner where the traction beam 302 connects to the bolster beam 303, and is connected to the bolster beam 303 and the lower traction beam 3022 respectively.

[0095] To accommodate the rear-mounted crushing pipe of the coupler at one end, the upper traction beam 3021, the lower traction beam 3022, the upper cover plate 3023, and the lower cover plate 3024 form a frame structure.

[0096] The upper cover plate 3023, the lower cover plate 3024, and the fifth reinforcing plate 3061 connect the upper traction beam 3021 and the lower traction beam 3022 to form the frame structure. This frame structure is located behind the coupler seat 301 and is welded to the coupler seat 301 to enhance the strength of the structure behind the coupler seat 301. The term "behind" refers to the installation direction of the coupler; the rear is defined as one end of the coupler seat 301 extending along the installation direction of the coupler.

[0097] The third reinforcing structure 306 reinforces the corner connection through the sixth reinforcing plate 3062, which can effectively reduce the stress amplitude and alleviate stress concentration.

[0098] In some embodiments, please refer to Figure 6 The upper surfaces of both the front bolster beam 3031 and the rear bolster beam 3032 are flush with the upper surface of the upper traction beam 3021. In related technologies, the outer floor 50 is covered and attached to the bolster beam 303. However, according to the above design, with the upper surface of the upper traction beam 3021 flush with the upper plane of the outer floor 50, the thickness of the bolster beam 303 is increased by the thickness of the original outer floor 50. The thickness of the entire bolster beam can reach 223mm, which has a higher section modulus and can bear higher longitudinal and vertical loads. It will also change the longitudinal load or stress transmission path on the base frame 1.

[0099] In some embodiments, please refer to Figure 5 and Figure 9 The top cover plate 3023 of the first traction pillow 31 is a single-layer plate, while the top cover plate 3023 of the second traction pillow 32 is a profile with a cavity.

[0100] The two ends of the base frame 1 do not require a crushing tube to be placed behind the coupler seat 301 of the two-position traction pillow 32, and there is enough space to adopt a profile structure with cavity with higher vertical bending resistance.

[0101] In some embodiments, please refer to Figure 6 Each traction pillow 30 also includes a second transition structure 304, which is located at the connection between the rear pillow beam 3032 and the pillow floor 40 to reduce stress concentration.

[0102] The thickness of the rear bolster beam 3032 is greater than that of the inner floor 40. When stress is transferred from the rear bolster beam 3032 to the inner floor 40, the cross-sectional shape of the component changes significantly, the vertical dimension is significantly reduced, the continuity of the cross-sectional geometry is interrupted, which will cause stress concentration at this point and even damage the structure.

[0103] Therefore, the second transition structure 304 should satisfy the requirement that its cross-sectional shape can enhance the continuity of the cross-sectional geometry at this connection, avoiding abrupt changes in cross-sectional shape, or possess a certain stiffness to smooth the abrupt change in stiffness from the rear bolster beam 3032 to the inner floor 40. For example, the second transition structure 304 can be a profile with multiple triangular cross-sectional cavities, which is simpler in structure than the component cross-section of the rear bolster beam 3032, but more complex than the component cross-section of the inner floor 40. In addition, the second transition structure 304 can also be a structural component made of materials with different stiffnesses; any structure that can smooth the change in stiffness can be adaptively applied to this connection.

[0104] In some embodiments, please refer to Figure 4 and Figure 6Each traction pillow 30 also includes a fourth reinforcing structure 307, which includes a seventh reinforcing plate 3071, an eighth reinforcing plate 3072, and a second reinforcing rib 3073. The seventh reinforcing plate 3071 is connected to the second transition structure 304 and is attached to the lower plane of the pillow inner floor 40. The eighth reinforcing plate 3072 is a bent plate, which is connected to one end of the rear pillow beam 3032 near the pillow inner floor 40 and bent towards the pillow inner floor 40. The second reinforcing rib 3073 is embedded between the seventh reinforcing plate 3071 and the bent plate and is connected to the rear pillow beam 3032.

[0105] For details, please refer to Figure 6 The second transition structure 304 is a profile with two triangular cross-section cavities, and a protruding edge extends from its lower surface. The seventh reinforcing plate 3071 is butt-welded to the second transition structure 304. The seventh reinforcing plate 3071 is attached to the lower plane of the inner floor 40 and connected by circumferential welding. In the middle area of ​​the rear headrest beam 3032 and the wire hole area, the bent plate is butt-welded, and the bent plate is connected to the seventh reinforcing plate 3071 by the second reinforcing rib 3073.

[0106] The fourth reinforcing structure 307 increases the vertical stiffness at the connection between the rear bolster beam 3032 and the inner floor 40, suppressing the stress concentration problem caused by the non-coordinated deformation at the connection between the rear bolster beam 3032 and the inner floor 40 under longitudinal load.

[0107] In some embodiments, please refer to Figure 7 The underframe 1 also includes longitudinal beams 80. The two ends of the coupler seat 301 of the two-position traction pillow 32 are respectively connected to the two longitudinal beams 80. The longitudinal beams 80 are connected to the two-position end beams 12. The two longitudinal beams 80 are arranged along the longitudinal direction of the underframe 1, and the distance between the connection points on the two-position end beams 12 is greater than the distance between the connection points on the coupler seat 301.

[0108] In some embodiments, please refer to Figure 8 Each longitudinal beam 80 includes an upper longitudinal beam 801, a lower longitudinal beam 802, and a vertical plate 803. The upper longitudinal beam 801 is spliced ​​and connected to the outer floor 50 of the pillow, and the upper surface of the upper longitudinal beam 801 is flush with the upper surface of the outer floor 50 of the pillow. The upper longitudinal beam 801 is connected to the vertical plate 803, and the vertical plate 803 stands on the upper longitudinal beam 801. The vertical plate 803 is connected to the lower longitudinal beam 802. The outer floor 50 of the pillow includes a connecting plate 501, and the two upper longitudinal beams 801 are connected by the connecting plate 501.

[0109] It can be seen that the coupler seats 301 of the second-position end beam 12 and the second-position traction buffer 32 are indirectly connected by the longitudinal beam 80, and the longitudinal beam 80 provides a path for longitudinal load or stress transfer between the second-position end beam 12 and the second-position traction buffer 32. Specifically, in order to ensure that the longitudinal beam 80 meets the strength requirements and reduce the structural weight, the vertical plate 803 is a single-layer plate, which is set between the upper longitudinal beam 801 and the lower longitudinal beam 802. The lower longitudinal beam 802 can be a T-shaped section member, which has a web and flanges. The web of the lower longitudinal beam 802 member is connected to the vertical plate 803. The upper longitudinal beam 801 can be a similar T-shaped section member, with a web and two flanges. The web of the upper longitudinal beam 801 member is connected to the vertical plate 803, and the two flanges are respectively spliced ​​and connected to the upper and lower surfaces of the outer floor 50 of the traction buffer. The upper flanges of the two upper longitudinal beams 801 members are connected by the connecting plate 501.

[0110] In some embodiments, please refer to Figure 9 The upper traction beam 3021 of the second traction pillow 32 overlaps and is butt-welded to the outer floor 50 and the upper cover plate 3023 on both sides respectively.

[0111] In some embodiments, please refer to Figure 10 The second-position traction buffer 32 also includes a third transition structure 308, which is located at the connection between the traction beam 302 of the second-position traction buffer 32 and the coupler seat 301 of the second-position traction buffer 32, and is used to smooth out stiffness changes.

[0112] The third transition structure 308 can be a profile with multiple cavities arranged longitudinally along the base frame 1, and the wall thickness varies in a gradient to smooth the stiffness change at the connection and reduce stress concentration.

[0113] In one specific embodiment, the base frame 1 combines the above-mentioned technical features; please refer to [reference needed]. Figure 1 For the base frame 1, the upper surface of the upper traction beam 3021 is flush with the upper plane of the outer floor 50 of the pillow, and the upper surfaces of the front pillow beam 3031 and the rear pillow beam 3032 are both flush with the upper surface of the upper traction beam 3021. The traction beam 302 and the pillow beam 303 both have a large section modulus, which makes the traction beam 302 and the pillow beam 303 have a higher bending modulus and a larger stress transmission path under longitudinal load.

[0114] For example, under normal car body configuration, the end beam 10 ensures that it does not interfere with the movement space of the opening and closing fairing and bogie. The first end beam 11, the first traction bolster buffer 31, and the side beam assembly 20 form a frame structure with high rigidity and strength around the outer bolster floor 50 at the first end. Under the longitudinal load of the coupler during coupled operation, the stress transfer from the coupler seat 301 to the bolster beam 303 is more direct, the outer bolster floor 50 bears less longitudinal load, and the stress is mainly transferred along the first traction bolster buffer 31 to the side beam assembly 20 and the inner bolster floor 40.

[0115] Meanwhile, by adding a third reinforcing structure 306 at the connection between the traction beam 302 and the bolster beam 303, the stress transmission is guided and the stress peak at the connection between the traction beam 302 and the bolster beam 303 is mitigated.

[0116] The stress on the rear bolster beam 3032 is transferred to the inner floor 40 through the second transition structure 304. Due to the difference in cross-sectional height and stiffness between the two, the vertical bending moment at the connection between the inner floor 40 and the second transition structure 304 is relatively large. The fourth reinforcing structure 307 increases the vertical stiffness of the connection area, suppresses the vertical bending of the inner floor 40, and guides the stress to be transferred longitudinally to the other end.

[0117] Meanwhile, some of the longitudinal stress is transmitted through the pillow beam 303 and the inner floor 40 to the side beam assembly 20 welded to both sides, and then along the side beam assembly 20 to the other end.

[0118] For example, when a longitudinal load is applied to the coupler mounting base at the two-position end, the stress transmission is essentially the same as at the one-position end.

[0119] For example, under collision load, the stress transfer process before the coupler shears off is the same as described above. After the coupler shears off, the coupler no longer applies longitudinal load to the car body. When the anti-creep device is activated, the collision load is applied through the anti-creep device to the anti-creep device mounting interfaces 101 on both sides of the end beam 11. At this time, the main stress is transferred to the side beam assembly 20 through the end beam 11, and part of the stress is transferred through the end beam 11 to the first reinforcing rib 704 in the first reinforcing structure 70 and the outer floor 50 of the sleeper, and then to the sleeper beam 303.

[0120] At the same time, the longitudinal deformation of the first end beam 11 transfers part of the load to the first traction pillow 31 through shear stress, and then to the second end along the structure around the pillow beam 303.

[0121] The resulting chassis 1, obtained through the above technical solution, meets operational requirements such as collision performance and load-bearing capacity.

[0122] This application also provides a rail vehicle, which is composed of multiple car bodies. The car body structure mainly includes a chassis structure, side wall structure, roof structure and end wall structure, wherein the chassis structure of at least one car body adopts any of the above-mentioned chassis 1, and the chassis 1 is the main load-bearing structure of this car body structure.

[0123] Specifically, the multi-section car body includes an intermediate car and a lead car with a driver's cab. The rail vehicle can have multiple lead cars. Any one lead car can be used as a traction car body, while the other lead cars are used as traction cars bodies. Therefore, the longitudinal load on the car body may be applied to one end of its underframe or to two ends. The transmission of the longitudinal load can be referred to in the specific embodiment of the underframe 1 described above.

[0124] In some embodiments, the rail vehicle is a multiple-unit trainset, consisting of multiple car body formations. Each car body formation contains multiple car bodies, including a lead car with a driver's cab. There is at least one lead car in a car body formation that both pulls the other car bodies in its own formation and is also pulled by the car bodies in other formations. Therefore, the car body, including the lead car, may have a longitudinal load applied to one end of its underframe or a longitudinal load applied to two ends. The transmission of the longitudinal load can be referred to in the specific embodiment of the underframe 1 described above.

[0125] The rail vehicle meets the requirements for public transportation operation, has good load-bearing capacity and collision performance that meets design requirements, and also meets the space requirements for the arrangement of other components on the vehicle body.

[0126] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A chassis for a rail vehicle, characterized in that, include: End beams, including single-end beams and double-end beams; Side beam assemblies, two of which are respectively connected to the first end beam and the second end beam, extend longitudinally along the base frame and are spaced apart; The traction pillow buffer includes a coupler seat, a traction beam, and a pillow beam. The coupler seat is connected to the traction beam, and the traction beam is connected to the pillow beam. The traction pillow buffer is divided into a single-position traction pillow buffer and a double-position traction pillow buffer. In the single-position traction pillow buffer, the coupler seat is connected to the single-position end beam, and the pillow beam is disposed between and connected to the two side beam assemblies. In the double-position traction pillow buffer, the coupler seat is connected to the double-position end beam, and the pillow beam is disposed between and connected to the two side beam assemblies. The inner floor of the pillow connects the first traction pillow buffer and the second traction pillow buffer, and is disposed between the two side beam assemblies and connected to the two side beam assemblies; as well as The outer floor of the pillow is provided on both sides of the first traction pillow buffer and the second traction pillow buffer. The two ends of the outer floor of the pillow are respectively connected to the corresponding end beam and the corresponding pillow beam, and are provided between the two side beam assemblies. The first end beam includes a profile with double cavities, the stacking direction of the double cavities of the first end beam is along the longitudinal direction of the base frame, and the coupler seat of the first traction pillow is spliced ​​and connected to the inner cavity of the first end beam near the outer floor of the pillow. The outer floor of the pillow includes a profile with a single-layer cavity, and the base frame includes a first transition structure. The first transition structure is disposed at the connection between the first end beam and the outer floor of the pillow. The first transition structure includes a profile with a cavity, and the cavity wall thickness is between the profile wall thickness of the first end beam and the outer floor of the pillow. Each of the traction beams further includes an upper cover plate and a lower cover plate; each of the traction beams includes two upper traction beams and two lower traction beams, the two upper traction beams and the two lower traction beams are respectively arranged laterally at intervals along the underframe, the lower cover plate connects the two lower traction beams and covers at least a portion of the lower traction beams, the upper cover plate is embedded between the two upper traction beams and connects the two upper traction beams; each of the traction beams further includes a second reinforcing structure, the second reinforcing structure includes a fourth reinforcing plate, each of the upper traction beams and each of the lower traction beams is sandwiched between two fourth reinforcing plates, the two fourth reinforcing plates are arranged laterally at intervals along the underframe; Both the upper traction beam and the lower traction beam include open-type profiles, and the open-type profile of the upper traction beam has double cavities. The double cavities are arranged adjacent to each other in the transverse direction of the base frame, and the wall thickness of the outer cavity closer to the outer floor is less than the wall thickness of the inner cavity farther from the outer floor.

2. The base frame according to claim 1, characterized in that, The first end beam also includes an anti-climb device mounting interface, which is used to install an anti-climb device. Two anti-climb device mounting interfaces are arranged laterally along the underframe on both sides of the coupler seat of the first end traction bolster.

3. The base frame according to claim 2, characterized in that, The base frame includes a first reinforcing structure distributed on both sides of the first traction pillow, located behind the anti-climb device mounting interface. The first reinforcing structure includes a first reinforcing plate, a second reinforcing plate, and a first reinforcing rib. The first reinforcing rib connects the first end beam and the outer floor of the pillow. The first reinforcing plate stands sideways on the first end beam, with its opposite ends connected to the first reinforcing rib and the side beam assembly, respectively. The second reinforcing plate leans against the first end beam, connecting the first end beam and the outer floor of the pillow.

4. The base frame according to claim 3, characterized in that, The first reinforcing structure also includes a third reinforcing plate, which stands on the side of the first end beam, with its opposite ends connected to the first traction pillow to ease the first reinforcing bar.

5. The base frame according to claim 1, characterized in that, Each of the traction pillows is connected to the outer floor of the pillow, and the upper surface of the upper traction beam is flush with the upper plane of the outer floor of the pillow.

6. The base frame according to claim 1, characterized in that, Each of the bolster beams includes a front bolster beam and a rear bolster beam, which are arranged adjacent to each other along the longitudinal direction of the base frame. The front bolster beam is connected to the outer floor of the bolster, and the rear bolster beam is connected to the inner floor of the bolster. The upper surfaces of both the front and rear bolster beams are flush with the upper surface of the upper traction beam.

7. The base frame according to claim 1, characterized in that, Each of the traction pillows further includes a third reinforcing structure, the third reinforcing structure comprising a fifth reinforcing plate, the fifth reinforcing plate being connected to the pillow beam, sandwiched between the two lower traction beams, and connected to the two lower traction beams; and / or The third reinforcement structure also includes a sixth reinforcement plate, which is disposed at the outer corner where the traction beam connects to the bolster beam, and is connected to both the bolster beam and the lower traction beam.

8. The base frame according to claim 1, characterized in that, The upper cover plate of the first traction pillow buffer is a single-layer plate, while the upper cover plate of the second traction pillow buffer is a profile with a cavity.

9. The base frame according to claim 1, characterized in that, Each of the aforementioned bolster beams also includes an anti-roll torsion bar seat and an anti-hunting mounting seat; Each of the bolster beams includes a front bolster beam and a rear bolster beam, which are arranged adjacent to each other along the longitudinal direction of the base frame. The front bolster beam is connected to the outer floor of the bolster, and the rear bolster beam is connected to the inner floor of the bolster. The anti-roll torsion bar seat is arranged at both ends of the front bolster beam along the transverse direction of the base frame, and the anti-hunting mounting seat is arranged at both ends of the rear bolster beam along the transverse direction of the base frame.

10. The base frame according to claim 9, characterized in that, Each of the traction pillows also includes a second transition structure, which is disposed at the connection between the rear pillow beam and the pillow floor.

11. The base frame according to claim 10, characterized in that, Each of the aforementioned traction pillows also includes a fourth reinforcing structure, which includes a seventh reinforcing plate, an eighth reinforcing plate, and a second reinforcing rib. The seventh reinforcing plate is connected to the second transition structure and is attached to the lower plane of the pillow inner floor. The eighth reinforcing plate is a bent plate, which is connected to one end of the rear pillow beam near the pillow inner floor and bent towards the pillow inner floor. The second reinforcing rib is embedded between the seventh reinforcing plate and the bent plate and is connected to the rear pillow beam.

12. The base frame according to claim 1, characterized in that, The two-position traction buffer also includes a third transition structure, which is disposed at the connection between the traction beam of the two-position traction buffer and the coupler seat of the two-position traction buffer.

13. The base frame according to claim 1, characterized in that, The underframe also includes longitudinal beams. The two ends of the coupler seats of the two-position traction buffer are respectively connected to the two longitudinal beams. The longitudinal beams are connected to the two-position end beams. The two longitudinal beams are arranged along the longitudinal direction of the underframe, and the distance between the connection points on the two-position end beams is greater than the distance between the connection points on the coupler seats.

14. The base frame according to claim 13, characterized in that, Each of the longitudinal beams includes a lower longitudinal beam, an upper longitudinal beam, and a vertical plate. The upper longitudinal beam is spliced ​​and connected to the outer floor of the pillow, and the upper surface of the upper longitudinal beam is flush with the upper plane of the outer floor of the pillow. The upper longitudinal beam is connected to the vertical plate, and the vertical plate stands on the upper longitudinal beam. The vertical plate is connected to the lower longitudinal beam. The outer floor of the pillow includes a connecting plate, and the two upper longitudinal beams are connected by the connecting plate.

15. A rail vehicle, characterized in that, It includes the base frame as described in any one of claims 1 to 14.

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