Underframe and rail vehicles

Abstract

This invention relates to the field of rail vehicle technology, and particularly to a chassis and a rail vehicle. The chassis includes a sleeper-beam assembly. The sleeper-beam assembly includes a sleeper beam, two secondary spring seats, a first traction seat, and two coolant pipes. The sleeper beam includes a base plate, a top plate spaced apart from the base plate, two end plates connecting the base plate and the top plate, and two side plates connecting the base plate and the top plate. The base plate, top plate, two end plates, and two side plates form a receiving cavity, wherein the two end plates are spaced apart along a first direction, and the two side plates are spaced apart along a second direction, the first direction being perpendicular to the second direction. Both secondary spring seats are installed in the receiving cavity. The first traction seat is disposed on the base plate, and the first traction seat is located between the two secondary spring seats in the second direction. The two coolant pipes are spaced apart in the receiving cavity in the second direction and located between the two secondary spring seats, both coolant pipes extending along the first direction, and both ends of the coolant pipes passing through the two end plates respectively.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle technology, and particularly to a chassis and rail vehicle. Background Technology

[0002] The sleeper beam is a key load-bearing component in the underframe of a rail vehicle. In traditional rail vehicles, the sleeper beam only bears vertical loads; the weight above the secondary spring is transferred to the bogie through the secondary spring seat mounted on the sleeper beam. However, the bogie typically traction the rail vehicle using a traction rod, which transmits the traction force to the traction seat mounted under the end traction beam or side beam, thus ensuring the traction force is transmitted along the path of the bogie, traction rod, underframe, and rail vehicle.

[0003] In related technologies, the aforementioned traction force transmission route is relatively complex, and the presence of the traction rod will encroach on the space below the bolster beam used for arranging coolant pipes that transport coolant. Summary of the Invention

[0004] The present invention provides a chassis and rail vehicle for preventing the traction rod from encroaching on the space of the coolant pipe.

[0005] In a first aspect, the present invention provides a base frame, including a bolster assembly, the bolster assembly comprising:

[0006] The bolster beam includes a bottom plate, a top plate spaced apart from the bottom plate, two end plates connected between the bottom plate and the top plate, and two side plates connected between the bottom plate and the top plate. The bottom plate, the top plate, the two end plates, and the two side plates form a receiving cavity. The two end plates are spaced apart along a first direction, and the two side plates are spaced apart along a second direction. The first direction is perpendicular to the second direction.

[0007] Two secondary spring seats, both of which are installed in the receiving cavity;

[0008] A first traction seat, disposed on the base plate, and located between the two secondary spring seats in the second direction; and

[0009] Two coolant pipes are spaced apart in the receiving cavity and located between the two secondary spring seats in the second direction. Both coolant pipes extend along the first direction, and both ends of the coolant pipes pass through the two end plates respectively.

[0010] The number of the bolster beam assemblies is two, and the two bolster beam assemblies are spaced apart along the first direction; the base frame further includes:

[0011] A left beam and a right beam, wherein the left beam and the right beam are spaced apart along the second direction, and the sleeper beam is connected between the left beam and the right beam;

[0012] It also includes a transformer beam assembly, which is located between the two sleeper beam assemblies; the transformer beam assembly includes:

[0013] Two transformer beams, each connected between the left beam and the right beam, and spaced apart along the first direction; and

[0014] Four second traction seats are provided at both ends of each transformer beam, wherein the type of bogie to which the second traction seat is used is different from the type of bogie to which the first traction seat is used.

[0015] In some embodiments, the bolster assembly further includes:

[0016] A first stiffener, disposed within the receiving cavity, and connected between the secondary spring seat and the adjacent side plate; and

[0017] The second stiffener is disposed within the receiving cavity and is connected between the second spring seat and the end plate.

[0018] In some embodiments, the bolster assembly further includes:

[0019] A first upright plate is disposed within the receiving cavity, and each of the first upright plates is connected between two end plates, wherein each of the secondary spring seats is provided with a first upright plate between it and the adjacent coolant pipe; and

[0020] The third stiffener is connected between the second spring seat and the adjacent first upright plate.

[0021] In some embodiments, the bolster assembly further includes:

[0022] The second upright plate is disposed in the receiving cavity and is connected between the two end plates. Each coolant pipe has a second upright plate on the side away from the adjacent first upright plate.

[0023] A third upright plate, wherein the third upright plate is disposed within the receiving cavity and is connected between the two second upright plates; and

[0024] The fourth rib is disposed within the receiving cavity and is connected between the first vertical plate and the adjacent second vertical plate. The fourth rib is provided with a clearance hole for the coolant pipe to pass through.

[0025] In some embodiments, the base plate is provided with two first through holes, and the top plate is provided with two second through holes. The two first through holes, the two second through holes, and the two secondary spring seats correspond one-to-one. The bottom of the secondary spring seat is welded to the edge of the corresponding first through hole formed by the base plate, the top of the secondary spring seat protrudes from the corresponding second through hole, and the side of the secondary spring seat is welded to the edge of the corresponding second through hole formed by the base plate.

[0026] In some embodiments, the secondary spring seat includes:

[0027] A surrounding plate, the bottom of which is welded to the edge of the corresponding first through hole formed by the base plate to form a first weld; and

[0028] The top seat is welded to the top of the surrounding plate, and the top of the top seat protrudes from the corresponding second through hole. The side of the top seat is welded to the edge of the corresponding second through hole formed by the bottom plate to form a second weld.

[0029] The second weld is offset from the first weld in a third direction, which is perpendicular to both the first and second directions.

[0030] In some embodiments, the base frame further includes:

[0031] A front traction beam and a rear traction beam, wherein the front traction beam and the rear traction beam are spaced apart in the first direction, and both the front traction beam and the rear traction beam are connected between the left beam and the right beam, wherein two bolster beam assemblies are located between the front traction beam and the rear traction beam in the first direction; and

[0032] A middle longitudinal beam extends along the first direction and is located between the left beam and the right beam, with both ends of the middle longitudinal beam connected to the front traction beam and the rear traction beam, respectively. The first traction seat is connected to the middle longitudinal beam through the transition plate.

[0033] In some embodiments, the thickness of the two ends of the transformer beam in the first direction is greater than the thickness of the middle position of the transformer beam in the first direction.

[0034] Secondly, the present invention also provides a rail vehicle including the aforementioned underframe.

[0035] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0036] The chassis and rail vehicle provided by the present invention have at least the following advantages compared with the prior art:

[0037] The present invention relates to a chassis and rail vehicle in which coolant pipes are housed within a cavity, thus avoiding interference between the bogie and coolant pipes that would occur if the coolant pipes were placed below the sleeper beam. This also saves space below the sleeper beam, providing more space for the arrangement of other chassis components and optimizing the coolant flow path. Furthermore, the sleeper beam not only protects the coolant pipes and extends their service life, but also provides some insulation for the coolant flowing within them. Attached Figure Description

[0038] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0039] Figure 1 A partial structural diagram of the base frame at the position of the sleeper beam assembly provided in an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the internal structure of the pillow beam provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the structure of the bottom plate of the sleeper beam provided in an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of the structure of the bolster assembly provided in the embodiments of this application;

[0043] Figure 5 This is a schematic diagram of the structure of the dual-spring seat provided in the embodiments of this application;

[0044] Figure 6 This is a schematic diagram of the structure of the base frame provided in the embodiments of this application;

[0045] Figure 7 This is a schematic diagram of the structure of the second traction seat provided in an embodiment of this application;

[0046] Figure 8 This is a schematic diagram of the structure of the first traction seat provided in an embodiment of this application.

[0047] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0048] Figure label:

[0049] 1-Base frame;

[0050] 11-Pillow beam assembly;

[0051] 111-Pillow beam; 1111-Bottom plate; 1111a-First through hole; 1112-Top plate; 1112a-Second through hole; 1113-End plate; 1114-Side plate; 1115-Receiving cavity;

[0052] 112-Secondary spring seat; 1121-Side plate; 1122-Top seat; 1123-Guide pin;

[0053] 113-First traction seat; 1131-Second stop surface; 1132-Third stop surface; 1133-Second mounting hole; 1134-Third mounting hole;

[0054] 114 - Coolant pipe;

[0055] 1151 - First stiffening slab; 1152 - Second stiffening slab; 1153 - First vertical slab; 1154 - Third stiffening slab; 1155 - Second vertical slab; 1156 - Third vertical slab; 1157 - Fourth stiffening slab;

[0056] 12 - Left beam; 13 - Right beam;

[0057] 14-Front-end traction beam; 15-Rear-end traction beam;

[0058] 16 - Intermediate longitudinal beam;

[0059] 17-Transition plate;

[0060] 18-Transformer beam assembly; 181-Transformer beam; 182-Second traction seat; 1821-Counterhead; 1822-First stop surface; 1823-First mounting hole; 183-First support beam; 184-Second support beam. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] In this application, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0064] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings.

[0065] Please refer to the following: Figure 1 and Figure 2 In a first aspect, embodiments of the present invention provide a base frame 1, including a bolster beam assembly 11. The bolster beam assembly 11 includes a bolster beam 111, two secondary spring seats 112, a first traction seat 113, and two coolant pipes 114. Please refer to the accompanying documentation. Figure 1 , Figure 2 , Figure 3 and Figure 4 The bolster beam 111 includes a base plate 1111, a top plate 1112 spaced apart from the base plate 1111, two end plates 1113 connecting the base plate 1111 and the top plate 1112, and two side plates 1114 connecting the base plate 1111 and the top plate 1112. The base plate 1111, the top plate 1112, the two end plates 1113, and the two side plates 1114 form a receiving cavity 1115, wherein the two end plates 1113 are along a first direction (e.g., Figure 2 The two side plates 1114 are spaced apart in the middle X direction, and are arranged along the second direction (as shown in the middle X direction). Figure 2 (As shown in the Y direction) The two secondary spring seats 112 are spaced apart, with the first direction perpendicular to the second direction. Both secondary spring seats 112 are installed in the receiving cavity 1115. The first traction seat 113 is disposed on the base plate 1111, and the first traction seat 113 is located between the two secondary spring seats 112 in the second direction. Two coolant pipes 114 are spaced apart in the receiving cavity 1115 in the second direction and located between the two secondary spring seats 112. Both coolant pipes 114 extend along the first direction, and both ends of the coolant pipes 114 pass through the two end plates 1113 respectively.

[0066] The end plate 1113 is connected to the bottom plate 1111 and to the top plate 1112 by welding. Similarly, the side plate 1114 is connected to the bottom plate 1111 and to the top plate 1112 by welding. The end plate 1113 is also connected to the side plate 1114 by welding to enhance the connection strength of the bolster beam 111 and ensure the stability of the bolster beam 111.

[0067] Two secondary spring seats 112 are respectively adjacent to the side plates 1114 on both sides, such that the first traction seat 113 is located between the two secondary spring seats 112 in the second direction. Two coolant pipes 114 are located between the two secondary spring seats 112 in the second direction, and each coolant pipe 114 is adjacent to the secondary spring seat 112 on the same side.

[0068] In this embodiment, both the secondary spring seat 112 and the first traction seat 113 are installed on the bolster beam 111. The secondary spring seat 112 is used to connect with the secondary spring, and the first traction seat 113 is used to connect with the traction pin of the bogie. This allows the bolster beam 111 to both transfer the weight of the secondary spring to the bogie and transfer the traction and braking forces of the bogie to the underframe 1 through the traction seat, thus simplifying the transmission route of the bogie's traction force. In addition, the first traction seat 113 is located between the two secondary spring seats 112, which helps to more evenly transfer the traction and braking forces from the bogie to the underframe 1. The combined action of the secondary spring seat 112 and the first traction seat 113 can better control the relative movement between the underframe 1 and the bogie, reduce the swaying and vibration of the rail vehicle during operation, and reduce local stress concentration, thereby improving the durability and reliability of the underframe 1.

[0069] It should be noted that in this embodiment, the bogie is directly connected to the first traction seat 113 via a traction pin. Compared with the prior art where the bogie is connected to the traction seat via a traction rod, this requires fewer parts and has a simpler structure, indirectly improving the assembly and maintenance efficiency between the bogie and the first traction seat 113, while also reducing the cost of the first traction seat 113. Furthermore, connecting the bogie to the first traction seat 113 via a traction pin increases the longitudinal stiffness between the bogie and the first traction seat 113, enabling more stable transmission of traction and braking forces. Simultaneously, due to the high stiffness of the traction pin, it better constrains the relative movement between the underframe 1 and the bogie, thus reducing vibration and impact between the underframe 1 and the bogie, making the rail vehicle run more smoothly. Further, connecting the bogie to the first traction seat 113 via a traction pin reduces the proportion of space encroached upon by the bogie under the sleeper beam 111, providing more space for the arrangement of other components of the underframe 1.

[0070] It is understandable that since the first traction seat 113 is located on the base plate 1111, the connection between the bogie and the first traction seat 113 will inevitably encroach on the space below the bolster beam 111. In order to avoid interference between the coolant pipe 114 and the bogie, in this embodiment, the coolant pipe 114 is located in the receiving cavity 1115. This avoids interference between the bogie and the coolant pipe 114 when the coolant pipe 114 is located below the bolster beam 111. At the same time, it can further save the space below the bolster beam 111, providing more space for the arrangement of other components of the underframe 1, and optimizing the flow path of the coolant. In addition, the bolster beam 111 not only protects the coolant pipe 114 and extends its service life, but also provides a certain degree of heat preservation for the coolant flowing in the coolant pipe 114.

[0071] Please see Figure 2 In some embodiments, the bolster assembly 11 further includes a first stiffener 1151 and a second stiffener 1152. The first stiffener 1151 is disposed within the receiving cavity 1115 and connects the secondary spring seat 112 to the adjacent side plate 1114. The second stiffener 1152 is disposed within the receiving cavity 1115 and connects the secondary spring seat 112 to the end plate 1113.

[0072] In this embodiment, the first stiffening plate 1151 and the second stiffening plate 1152 are disposed in the receiving cavity 1115, thereby avoiding the first stiffening plate 1151 and the second stiffening plate 1152 occupying the space outside the pillow beam 111.

[0073] The first stiffening plate 1151 connects the secondary spring seat 112 and the adjacent side plate 1114, and extends generally along a second direction, thus fixing the secondary spring seat 112 in that direction. Similarly, the second stiffening plate 1152 connects the secondary spring seat 112 and the end plate 1113, and extends generally along a first direction, thus fixing the secondary spring seat 112 in that direction. The first stiffening plate 1151 and the second stiffening plate 1152 ensure a more stable connection between the secondary spring seat 112 and the bolster beam 111, preventing the secondary spring seat 112 from detaching.

[0074] Please continue reading. Figure 2 In some embodiments, the bolster assembly 11 further includes a first upright plate 1153 and a third stiffening plate 1154. The first upright plate 1153 is disposed within the receiving cavity 1115 and is connected between two end plates 1113, wherein each secondary spring seat 112 is provided with a first upright plate 1153 between it and the adjacent coolant pipe 114. The third stiffening plate 1154 is connected between the secondary spring seat 112 and the adjacent first upright plate 1153.

[0075] There are two first upright plates 1153, and each end of the first upright plate 1153 is welded to one of the two end plates 1113. One first upright plate 1153 is located between the secondary spring seat 112 and the coolant pipe 114 on one side, and the other first upright plate 1153 is located between the secondary spring seat 112 and the coolant pipe 114 on the other side. The first upright plates 1153 separate the secondary spring seat 112 and the coolant pipe 114, which can prevent the secondary spring seat 112 from hitting the coolant pipe 114 when it falls off.

[0076] The third stiffener 1154 is welded between the secondary spring seat 112 and the first upright plate 1153 on the same side, and the third stiffener 1154 extends approximately along the second direction, so that it can work with the first stiffener 1151 in the second direction to further fix the secondary spring seat 112, and further prevent the secondary spring seat 112 from falling off.

[0077] Please continue reading. Figure 2 In some embodiments, the bolster assembly 11 further includes a second upright plate 1155, a third upright plate 1156, and a fourth stiffening plate 1157. The second upright plates 1155 are disposed within the receiving cavity 1115 and are connected between two end plates 1113. Each coolant pipe 114 has a second upright plate 1155 on the side facing away from the adjacent first upright plate 1153. The third upright plate 1156 is disposed within the receiving cavity 1115 and is connected between two second upright plates 1155. The fourth stiffening plate 1157 is disposed within the receiving cavity 1115 and is connected between the first upright plate 1153 and the adjacent second upright plate 1155. The fourth stiffening plate 1157 has clearance holes for the coolant pipes 114 to pass through.

[0078] There are two second upright plates 1155, and both ends of the second upright plates 1155 are welded to the two end plates 1113 respectively. The two second upright plates 1155 are arranged between the two coolant pipes 114, and both second upright plates 1155 are adjacent to the coolant pipes 114 on the same side. That is to say, the two coolant pipes 114 are located between the adjacent first upright plate 1153 and the adjacent second upright plate 1155, which can further protect the coolant pipes 114.

[0079] The third upright plate 1156 is welded between the two second upright plates 1155, and can provide support for the two second upright plates 1155 in the second direction to prevent deformation of the second upright plates 1155. For example, there are two third upright plates 1156, and the two third upright plates 1156 are respectively adjacent to the two end plates 1113.

[0080] The fourth stiffener 1157 is welded between the first vertical plate 1153 and the second vertical plate 1155 to prevent deformation between the first vertical plate 1153 and the second vertical plate 1155 from squeezing inwards and affecting the coolant pipe 114. It should be noted that there are at least two fourth stiffeners 1157, and the welding positions of some of the fourth stiffeners 1157 to the first vertical plate 1153 are not staggered with the welding positions of the third stiffener 1154 to the first vertical plate 1153 in the first direction. The welding positions of the other part of the fourth stiffeners 1157 to the second vertical plate 1155 are not staggered with the welding positions of the third vertical plate 1156 to the second vertical plate 1155 in the first direction.

[0081] In this case, the welding positions of a portion of the fourth stiffener 1157 welded to the first vertical plate 1153 and the welding positions of the third stiffener 1154 welded to the first vertical plate 1153 are not staggered in the first direction. This ensures that the force transmitted from the third stiffener 1154 to the first vertical plate 1153 will cancel out the force transmitted from the fourth stiffener 1157 to the first vertical plate 1153, and will not form a torque between the fourth stiffener 1157 and the fourth stiffener 1157, causing deformation of the first vertical plate 1153.

[0082] Similarly, the welding positions of the other part of the fourth stiffener 1157 to the second vertical plate 1155 and the welding positions of the third vertical plate 1156 to the second vertical plate 1155 are not staggered in the first direction, so that the force transmitted from the third vertical plate 1156 to the second vertical plate 1155 will cancel out the force transmitted from the fourth stiffener 1157 to the second vertical plate 1155, and will not form a torque between the fourth stiffener 1157 and the second vertical plate 1155, causing deformation of the second vertical plate 1155.

[0083] It is understandable that the first upright plate 1153 and the second upright plate 1155 both extend approximately along the first direction, which can enhance the stability of the end plate 1113 in the first direction and effectively prevent the end plate 1113 from deforming. The first stiffening plate 1151, the third stiffening plate 1154, the fourth stiffening plate 1157 and the third upright plate 1156 all extend approximately along the second direction, which can enhance the stability of the side plate 1114, the first upright plate 1153 and the second upright plate 1155 in the second direction and effectively prevent the side plate 1114, the first upright plate 1153 and the second upright plate 1155 from deforming. Meanwhile, the secondary spring seat 112 is connected to the side plate 1114 through the first stiffener 1151, to the end plate 1113 through the second stiffener 1152, and to the first vertical plate 1153 through the third stiffener 1154. This can enhance the stability of the connection between the secondary spring seat 112 and the pillow beam 111 in the first and second directions, and effectively prevent vibrations in the first and second directions from causing the secondary spring seat 112 to detach from the pillow beam 111.

[0084] Please refer to the following: Figure 3and Figure 4 In some embodiments, the base plate 1111 is provided with two first through holes 1111a, and the top plate 1112 is provided with two second through holes 1112a. The two first through holes 1111a, the two second through holes 1112a and the two secondary spring seats 112 correspond one-to-one. The bottom of the secondary spring seat 112 is welded to the edge of the corresponding first through hole 1111a formed by the base plate 1111, the top of the secondary spring seat 112 protrudes from the corresponding second through hole 1112a, and the side of the secondary spring seat 112 is welded to the edge of the corresponding second through hole 1112a formed by the base plate 1111.

[0085] The bottom of the secondary spring seat 112 is welded to the edge of the corresponding first through hole 1111a on the base plate 1111, so that the secondary spring can be inserted through the first through hole 1111a and connected to the secondary spring seat 112.

[0086] Understandably, the upper surface of the top plate 1112 of the bolster beam 111 is usually roughly on the same plane as the upper surface of the side beam of the base frame 1. Similarly, the top surface of the secondary spring seat 112 is also roughly on the same plane as the upper surface of the bolster beam 111. If the length of the secondary spring is long and fixed, the secondary spring seat 112 cannot match the secondary spring, requiring the installation positions of the bolster beam 111 and the secondary spring seat 112 to be moved upwards. This results in the upper surface of the bolster beam 111 being higher than the upper surface of the side beam, causing stress concentration at the connection point between the bolster beam 111 and the side beam. To solve this problem, in this embodiment, a second through hole 1112a is provided in the top plate 1112 of the bolster beam 111, and the top of the secondary spring seat 112 protrudes from the corresponding second through hole 1112a. Moving the installation position of the secondary spring seat 112 upwards maintains the upper surface of the bolster beam 111 and the upper surface of the side beam being approximately coplanar, allowing the secondary spring seat 112 to accommodate longer secondary springs.

[0087] Furthermore, compared with the prior art which provides a connecting plate between the side of the portion of the secondary spring seat 112 protruding from the second through hole 1112a and the upper surface of the pillow beam 111, the embodiment of this application provides the first stiffening plate 1151, the second stiffening plate 1152 and the third stiffening plate 1154 connecting the secondary spring seat 112 in the receiving cavity 1115, which can save space above the pillow beam 111 and avoid encroaching on the space of the cable set above the pillow beam 111.

[0088] Please refer to the following: Figure 1 , Figure 3 and Figure 5In some embodiments, the second spring seat 112 includes a surrounding plate 1121 and a top seat 1122. The bottom of the surrounding plate 1121 is welded to the edge of the corresponding first through hole 1111a formed by the bottom plate 1111 to form a first weld. The bottom of the top seat 1122 is welded to the top of the surrounding plate 1121, and the top of the top seat 1122 protrudes from the corresponding second through hole 1112a. The side of the top seat 1122 is welded to the edge of the corresponding second through hole 1112a formed by the bottom plate 1111 to form a second weld. The second weld is located in a third direction (e.g., Figure 4 (As shown in the Z direction) It is offset from the first weld, and the third direction is perpendicular to the first direction and perpendicular to the second direction.

[0089] Please see Figure 1 The secondary spring seat 112 also includes a guide pin 1123, which is connected to the bottom of the top seat 1122 and is used to connect the secondary spring.

[0090] In this embodiment, the second weld is staggered from the first weld in the third direction, which can disperse stress and avoid stress concentration in the secondary spring seat 112. At the same time, it can ensure that the secondary spring seat 112 has good bending and shear resistance in the third direction, thereby ensuring the structural strength of the secondary spring seat 112 in the third direction.

[0091] Please refer to the following: Figure 1 and Figure 6 In some embodiments, there are two bolster beam assemblies 11, which are spaced apart along a first direction. The base frame 1 also includes a left beam 12 and a right beam 13, a front traction beam 14 and a rear traction beam 15, and a middle longitudinal beam 16. The left beam 12 and the right beam 13 are spaced apart along a second direction, and the bolster beam 111 is connected between the left beam 12 and the right beam 13. The front traction beam 14 and the rear traction beam 15 are spaced apart along a first direction, and both the front traction beam 14 and the rear traction beam 15 are connected between the left beam 12 and the right beam 13. The two bolster beam assemblies 11 are located between the front traction beam 14 and the rear traction beam 15 in the first direction. The middle longitudinal beam 16 extends along the first direction and is located between the left beam 12 and the right beam 13. The two ends of the middle longitudinal beam 16 are respectively connected to the front traction beam 14 and the rear traction beam 15. The first traction seat 113 is connected to the middle longitudinal beam 16 through a transition plate 17.

[0092] The front traction beam 14, rear traction beam 15, left beam 12, and right beam 13 are connected to form the basic frame of the underframe 1. The two sleeper beam assemblies 11 can be located close to the front traction beam 14 and the rear traction beam 15 respectively, which can better distribute and transfer the load, improve the load-bearing capacity of the underframe 1, and better resist the impact of the rail vehicle during operation to maintain the stability of the underframe 1.

[0093] In addition, the intermediate longitudinal beam 16 connects the front traction beam 14 and the rear traction beam 15, which can further enhance the stability of the underframe 1. The first traction seat 113 is connected to the intermediate longitudinal beam 16 through the transition plate 17, which can further enhance the stability of the first traction seat 113.

[0094] Please see Figure 6 In some embodiments, the underframe 1 further includes a transformer beam assembly 18, which is located between two sleeper beam assemblies 11. The transformer beam assembly 18 includes two transformer beams 181 and four second traction seats 182. Both transformer beams 181 are connected between the left beam 12 and the right beam 13, and the two transformer beams 181 are spaced apart along a first direction. Each transformer beam 181 has a second traction seat 182 at both ends, wherein the type of bogie connected to the second traction seat 182 is different from the type of bogie connected to the first traction seat 113.

[0095] The tops of the two transformer beams 181 are connected to the middle longitudinal beam 16, and the middle position of the two transformer beams 181 is used to install the transformer and stably support the transformer, preventing the transformer from shifting or being damaged due to external vibration or impact.

[0096] In this embodiment, a second traction seat 182 is provided at both ends of each transformer beam 181, which can form multi-point support, enhance the stability of the connection between the bogie and the transformer beam 181, effectively prevent the bogie from shifting or loosening relative to the transformer beam 181 during operation, ensure the stability of the rail vehicle operation, and also help to achieve balanced transmission and distribution of force between the bogie and the transformer beam 181, and improve the transmission efficiency of traction and braking force between the bogie and the transformer beam 181.

[0097] It should be noted that the type of bogie used for connection of the second traction seat 182 is different from the type of bogie used for connection of the first traction seat 113, which allows the underframe 1 to be used with different types of bogies, increasing the flexibility and adaptability of the underframe 1, and enabling the underframe 1 to select the appropriate bogie according to different operating requirements and track conditions.

[0098] It is understandable that the type of bogie that the second traction seat 182 is used to connect to is different from the type of bogie that the first traction seat 113 is used to connect to, which may be due to the different structures of the second traction seat 182 and the first traction seat 113.

[0099] Please see Figure 7For example, the second traction seat 182 may be provided with a countersunk hole 1821 having a first stop surface 1822. The second traction seat 182 may also be provided with a plurality of first mounting holes 1823 surrounding the countersunk hole 1821. The plurality of first mounting holes 1823 are used to install the traction pin of the bogie adapted to the second traction seat 182, thereby connecting the second traction seat 182 to the adapted bogie.

[0100] Please see Figure 8 The first traction seat 113 may have a second stop surface 1131 and a third stop surface 1132 opposite to each other in a first direction. The first traction seat 113 is provided with a plurality of second mounting holes 1133 and a plurality of third mounting holes 1134. The plurality of second mounting holes 1133 and the plurality of third mounting holes 1134 are all located between the second stop surface 1131 and the third stop surface 1132 in the first direction. The plurality of second mounting holes 1133 are spaced apart along the second direction and are adjacent to the second stop surface 1131, and the plurality of third mounting holes 1134 are spaced apart along the second direction and are adjacent to the third stop surface 1132. The plurality of second mounting holes 1133 and the plurality of third mounting holes 1134 are used to install the traction pin of a bogie adapted to the first traction seat 113, thereby connecting the first traction seat 113 to the adapted bogie.

[0101] Please refer to it again. Figure 6 In some embodiments, the transformer beam assembly 18 further includes a first support beam 183 and a second support beam 184, both of which are connected between the two transformer beams 181. The first support beam 183 and the second support beam 184 are located on either side of the intermediate longitudinal beam 16 in the second direction. The arrangement of the first support beam 183 and the second support beam 184 not only further enhances the structural rigidity between the two transformer beams 181, but also improves the load-bearing capacity of the base frame 1 while ensuring its stability.

[0102] In some embodiments, the thickness of the two ends of the transformer beam 181 in the first direction is greater than the thickness of the middle position of the transformer beam 181 in the first direction.

[0103] The transformer beam 181 is positioned in the middle for installing the transformer.

[0104] Increasing the thickness of both ends of the transformer beam 181 in the first direction can improve the ability of the ends of the transformer beam 181 to bear the force applied to the transformer beam 181 by the second traction seat 182, and prevent damage or deformation of the ends of the transformer beam 181.

[0105] In addition, the first support beam 183 can be adjacent to the left beam 12, and the second support beam 184 can be adjacent to the right beam 13. The two ends of the first support beam 183 can be respectively connected to the ends of the two transformer beams 181 connected to the left beam 12, and the two ends of the second support beam 184 can be respectively connected to the ends of the two transformer beams 181 connected to the right beam 13.

[0106] Secondly, the present invention also provides a rail vehicle (not shown in the figure) including the aforementioned chassis 1.

[0107] The rail vehicle provided in this embodiment includes the aforementioned underframe 1, which avoids interference between the bogie and the coolant pipe 114 when the coolant pipe 114 is located below the sleeper beam 111. It also saves space below the sleeper beam 111, providing more space for the arrangement of other components of the underframe 1 and optimizing the coolant flow path. Furthermore, the sleeper beam 111 not only protects the coolant pipe 114, extending its service life, but also provides some insulation for the coolant flowing within it. In addition, the rail vehicle is compatible with different types of bogies, increasing its flexibility and adaptability, allowing the selection of appropriate bogies based on different operating requirements and track conditions.

[0108] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", 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 this invention 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 this invention.

[0109] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A base frame, characterized in that, Includes a bolster assembly, the bolster assembly comprising: The bolster beam includes a bottom plate, a top plate spaced apart from the bottom plate, two end plates connected between the bottom plate and the top plate, and two side plates connected between the bottom plate and the top plate. The bottom plate, the top plate, the two end plates, and the two side plates form a receiving cavity. The two end plates are spaced apart along a first direction, and the two side plates are spaced apart along a second direction. The first direction is perpendicular to the second direction. Two secondary spring seats, both of which are installed in the receiving cavity; A first traction seat, disposed on the base plate, and located between the two secondary spring seats in the second direction; and Two coolant pipes are spaced apart in the receiving cavity and located between the two secondary spring seats in the second direction. Both coolant pipes extend along the first direction, and both ends of the coolant pipes pass through the two end plates respectively. The number of the bolster beam assemblies is two, and the two bolster beam assemblies are spaced apart along the first direction; the base frame further includes: A left beam and a right beam, wherein the left beam and the right beam are spaced apart along the second direction, and the sleeper beam is connected between the left beam and the right beam; It also includes a transformer beam assembly, which is located between the two sleeper beam assemblies; the transformer beam assembly includes: Two transformer beams, each connected between the left beam and the right beam, and spaced apart along the first direction; and Four second traction seats are provided at both ends of each transformer beam, wherein the type of bogie to which the second traction seat is used is different from the type of bogie to which the first traction seat is used.

2. The base frame according to claim 1, characterized in that, The sleeper beam assembly also includes: A first stiffener, disposed within the receiving cavity, and connected between the secondary spring seat and the adjacent side plate; and The second stiffener is disposed within the receiving cavity and is connected between the second spring seat and the end plate.

3. The base frame according to claim 2, characterized in that, The sleeper beam assembly also includes: A first upright plate is disposed within the receiving cavity, and each of the first upright plates is connected between two end plates, wherein each of the secondary spring seats is provided with a first upright plate between it and the adjacent coolant pipe; and The third stiffener is connected between the second spring seat and the adjacent first upright plate.

4. The base frame according to claim 3, characterized in that, The sleeper beam assembly also includes: The second upright plate is disposed in the receiving cavity and is connected between the two end plates. Each coolant pipe has a second upright plate on the side away from the adjacent first upright plate. A third upright plate, wherein the third upright plate is disposed within the receiving cavity and is connected between the two second upright plates; and The fourth rib is disposed within the receiving cavity and is connected between the first vertical plate and the adjacent second vertical plate. The fourth rib is provided with a clearance hole for the coolant pipe to pass through.

5. The base frame according to any one of claims 1-4, characterized in that, The base plate is provided with two first through holes, and the top plate is provided with two second through holes. The two first through holes, the two second through holes, and the two secondary spring seats correspond one-to-one. The bottom of the secondary spring seat is welded to the edge of the corresponding first through hole formed by the base plate, the top of the secondary spring seat protrudes from the corresponding second through hole, and the side of the secondary spring seat is welded to the edge of the corresponding second through hole formed by the base plate.

6. The base frame according to claim 5, characterized in that, The secondary spring seat includes: A surrounding plate, the bottom of which is welded to the edge of the corresponding first through hole formed by the base plate to form a first weld; and The top seat is welded to the top of the surrounding plate, and the top of the top seat protrudes from the corresponding second through hole. The side of the top seat is welded to the edge of the corresponding second through hole formed by the bottom plate to form a second weld. The second weld is offset from the first weld in a third direction, which is perpendicular to both the first and second directions.

7. The base frame according to any one of claims 1-4, characterized in that, The base frame also includes: A front traction beam and a rear traction beam, wherein the front traction beam and the rear traction beam are spaced apart in the first direction, and both the front traction beam and the rear traction beam are connected between the left beam and the right beam, wherein two bolster beam assemblies are located between the front traction beam and the rear traction beam in the first direction; and A middle longitudinal beam extends along the first direction and is located between the left beam and the right beam, with both ends of the middle longitudinal beam connected to the front traction beam and the rear traction beam, respectively. The first traction seat is connected to the middle longitudinal beam through a transition plate.

8. The base frame according to claim 1, characterized in that, The thickness of the two ends of the transformer beam in the first direction is greater than the thickness of the middle position of the transformer beam in the first direction.

9. A rail vehicle, characterized in that, Includes the chassis as described in any one of claims 1-8.

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