A pillow beam with a split lower cover plate

Abstract

The application discloses a pillow beam with split lower cover plates and relates to the technical field of railway passenger car bodies. The pillow beam comprises symmetrically arranged pillow beam lower cover plates, a center pin mounting seat assembly is arranged between the pillow beam lower cover plates, pillow beam webs are arranged on both sides of the top end of the pillow beam lower cover plates, a pillow beam upper cover plate is arranged at the top end of the pillow beam webs, a partition plate assembly is symmetrically arranged between the two groups of pillow beam webs, thick supplementary plates are arranged at the top end of the pillow beam lower cover plates and the center pin mounting seat assembly, the pillow beam upper cover plate is arranged in parallel between the pillow beam lower cover plates, and the pillow beam upper cover plate and the pillow beam webs are perpendicular to each other. The pillow beam structure is simplified, the bending resistance of the pillow beam is improved, and the forming and assembling difficulty of the pillow beam and the traction beam is reduced. The thick supplementary plates are arranged, so that the installation strength of the air spring and the center pin can be ensured, and the stability of the pillow beam during use is ensured.

Description

Technical Field

[0001] This invention relates to the field of railway passenger car body technology, and more specifically, to a sleeper beam with a split lower cover plate. Background Technology

[0002] The sleeper beam is a crucial component of the railway passenger car body underframe and a key part connecting the car body and bogies. It bears not only the longitudinal and vertical loads of the car body but also various loads from the bogies. Railway passenger cars with speeds of 160 km / h and above often employ center pin traction and air spring support. For sleeper beams where the air spring mounting surface is higher than the center pin mounting surface, a closed structure is typically formed by an upper cover plate, an integral lower cover plate, and two web plates, with the center pin mounting seat enclosed inside the sleeper beam. To meet the dimensional requirements of the air spring and center pin mounting, a thick pad is welded under the lower cover plate, resulting in poor stiffness matching. Existing sleeper beam structures are complex, with high local internal stress, requiring reinforcement in relevant areas, and are relatively heavy; their forming and assembly processes are also poor, leading to significant welding deformation.

[0003] For example, Chinese patent CN109131406B discloses a chassis assembly for a rail vehicle and the rail vehicle itself. The chassis assembly includes: two spaced-apart lower side beams; two spaced-apart bolster beams positioned between the two lower side beams along their length. Each bolster beam includes: a web structure; a center pin for connecting to the bogie of the rail vehicle; and a mounting frame connected to the web structure. The center pin is mounted on the mounting frame, which includes multiple upright plates spaced along the outer wall of the center pin. This design can solve the problem of insufficient connection strength between the center pin and the web structure of the bolster beam in the prior art. However, the lower cover plate of this bolster beam is an integral hat-shaped structure, with the web broken at the center pin seat, and the bolster beam has a non-uniform cross-section. This lower cover plate is difficult to form and assemble.

[0004] In summary, the existing bolster beam is fish-belly shaped, consisting of an upper cover plate, an integral lower cover plate, and two web plates forming a closed structure, with the center pin mounting seat enclosed inside the bolster beam. Because the air spring mounting surface is higher than the center pin mounting surface, a thick pad is welded to the lower surface of the lower cover plate and machined to meet the installation requirements of the air spring and center pin. The side beams have a continuous channel-shaped cross-section, with the web plates inserted into the channel at both ends. This results in a relatively small height dimension and poor bending resistance. The bolster beam and traction beam have numerous variable cross-sections, leading to stress concentration at inflection points, which is reduced through reinforcement. This results in a complex bolster beam structure, a small height dimension, poor bending resistance, significant difficulty in forming and assembling, poor stiffness matching between the thick pad and the lower cover plate, and large welding deformation.

[0005] There are currently no effective solutions to the problems in the relevant technologies. Summary of the Invention

[0006] In view of the problems in the related technologies, the present invention proposes a bolster beam with a split lower cover plate to overcome the above-mentioned technical problems existing in the existing related technologies.

[0007] Therefore, the specific technical solution adopted by the present invention is as follows: A bolster beam with a split lower cover plate includes symmetrically arranged lower cover plates, a center pin mounting seat assembly between the lower cover plates, bolster beam webs on both sides of the top of the lower cover plates, an upper cover plate at the top of the webs, a partition assembly symmetrically arranged between the two sets of webs, a thick patch plate at the top of both the lower cover plates and the center pin mounting seat assembly, and the upper cover plate and the lower cover plates are arranged parallel to each other, and the upper cover plate and the webs are perpendicular to each other.

[0008] Furthermore, to improve the stability of the lower cover plate of the bolster beam, the air spring mounting surface is integrally machined from the surface of the lower cover plate away from the thick patch plate. This ensures the flatness and precision of the mounting surface, improves the installation stability and operating performance of the air spring, avoids the problem of poor stiffness matching when welding a thick plate onto a thin plate, and reduces welding deformation. The lower cover plate of the bolster beam is made of a flat thick plate, and the two sets of lower cover plates are symmetrically arranged on both sides of the center pin mounting seat assembly. The surface of the lower cover plate away from the thick patch plate is provided with a downward boss, and the surface of the boss is set as the air spring mounting surface. The end of the lower cover plate away from the center pin mounting seat assembly is set as a step. The vertical distance between the air spring mounting surface and the upper cover plate of the bolster beam is less than the vertical distance between the center pin mounting surface and the upper cover plate of the bolster beam.

[0009] Furthermore, to increase the strength and bending resistance of the bolster beam, enabling it to better withstand forces and vibrations from different directions, the transverse vertical plate of the center pin mounting seat protrudes from the upper cover plate of the bolster beam and is welded thereon. Several weight-reduction holes are also provided. This not only maintains the structural strength through a reasonable layout but also reduces the overall weight of the bolster beam, achieving a balance between strengthening and weight reduction. The center pin mounting seat assembly includes a base plate positioned between the lower cover plates of the bolster beam. Transverse vertical plates are symmetrically arranged at the top of the base plate, and longitudinal vertical plates are symmetrically arranged between the transverse vertical plates. A stiffening plate is provided on one side of each longitudinal vertical plate. The transverse vertical plates are welded to the lower cover plate of the bolster beam using a beveled weld. The base plate is made of a flat, thick plate, and the surface of the base plate furthest from the transverse vertical plates is designated as the center pin mounting surface.

[0010] Furthermore, in order to connect the web of the bolster beam with the center pin mounting assembly, a downward protrusion is provided at the center of the bottom end of the web of the bolster beam, and the protrusion is connected to the bottom plate by welding.

[0011] The beneficial effects of this invention are as follows: 1. This invention simplifies the bolster beam structure, improves the bending resistance of the bolster beam, reduces the difficulty of forming and assembling the bolster beam and traction beam, and ensures the installation strength of the air spring and center pin by setting thick reinforcement plates, thus ensuring the stability of the bolster beam during use.

[0012] 2. By setting a cover plate under the bolster beam, the flatness and precision of the mounting surface of the air spring are ensured by machining in one piece, which improves the installation stability and operation of the air spring, avoids the problem of poor stiffness matching when welding a thick plate onto a thin plate, and reduces welding deformation.

[0013] 3. By setting up a center pin mounting bracket assembly, the strength and bending resistance of the bolster beam are increased, enabling the bolster beam to better withstand forces and vibrations from different directions. The transverse vertical plate of the center pin mounting bracket assembly protrudes and is welded to the upper cover plate of the bolster beam. At the same time, several weight-reducing holes are opened. This not only maintains the structural strength through reasonable layout, but also reduces the overall weight of the bolster beam, achieving a balance between strengthening and reducing weight. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a pillow beam with a split lower cover plate according to an embodiment of the present invention; Figure 2 This is an assembly drawing of a sleeper beam with a split lower cover plate, a center pin mounting seat assembly, and a sleeper beam web plate according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of a center pin mounting seat assembly for a pillow beam with a split lower cover plate according to an embodiment of the present invention. Figure 4 This is a schematic diagram of a pillow beam with a split lower cover plate from another angle according to an embodiment of the present invention; Figure 5 yes Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a structural schematic diagram of a pillow beam with a split lower cover plate according to an embodiment of the present invention. Figure 7 yes Figure 4 A magnified view of a section at point B in the middle.

[0016] In the picture: 1. Lower cover plate of the bolster beam; 101. Boss; 102. Air spring mounting surface; 2. Center pin mounting seat assembly; 201. Base plate; 2011. Center pin mounting surface; 202. Transverse vertical plate; 2021. Weight reduction hole; 203. Longitudinal vertical plate; 204. Stiffener plate; 3. Web plate of the bolster beam; 4. Upper cover plate of the bolster beam; 5. Partition assembly; 6. Thick patch plate; 7. Side beam; 8. Traction beam. Detailed Implementation

[0017] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0018] According to an embodiment of the present invention, a pillow beam having a split lower cover plate is provided.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-5 and Figure 7 As shown, the bolster beam with a split lower cover plate according to an embodiment of the present invention includes symmetrically arranged bolster beam lower cover plates 1, a center pin mounting seat assembly 2 between the bolster beam lower cover plates 1, bolster beam web plates 3 on both sides of the top of the bolster beam lower cover plates 1, a bolster beam upper cover plate 4 at the top of the bolster beam web plates 3, a partition plate assembly 5 symmetrically arranged between the two sets of bolster beam web plates 3, a thick patch plate 6 at the top of both the bolster beam lower cover plates 1 and the center pin mounting seat assembly 2, the bolster beam upper cover plate 4 being arranged parallel to the bolster beam lower cover plates 1, and the bolster beam upper cover plate 4 being perpendicular to the bolster beam web plates 3; the vertical distance between the air spring mounting surface 102 and the bolster beam upper cover plate 4 is less than the vertical distance between the center pin mounting surface 2011 and the bolster beam upper cover plate 4.

[0020] Specifically, such as Figure 6 As shown, in practical applications, the sleeper beam with a split lower cover provided by the present invention has side beams 7 at both ends and a traction beam 8 on one side. Because the lower plane of the air spring is much lower than the lower plane of the side beam of the full-length base frame, in order to achieve butt welding between the lower cover plate 1 of the sleeper beam and the side beam 7, and at the same time reduce the weight of the side beam 7, the height of the side beam 7 is increased only at the sleeper beam, that is, the side beams 7 inside and outside the sleeper beam are designed in a fish belly shape, and the side beam 7 is a variable cross-section structure.

[0021] One end of the traction beam 8 adopts a uniform cross-section design, which reduces the difficulty of forming and assembling the traction beam 8 and avoids stress concentration at the inflection point of the variable cross-section. It is connected to the same height as the web plate 3 of the bolster beam and the lower cover plate 1 of the bolster beam, and the vertical plate of the traction beam 8 is aligned with the transverse vertical plate 202 of the center pin mounting seat assembly 2, so that the load transfer is smooth and stress concentration is avoided. There is a certain space between the lower cover plate of the traction beam and the center pin mounting seat, and the lower cover plate of the traction beam is provided with a semi-circular notch, which facilitates the installation of the center pin through the process hole on the web plate 3 of the bolster beam.

[0022] By utilizing the above-mentioned technical solution of the present invention, the present invention simplifies the bolster beam structure, improves the bending resistance of the bolster beam, reduces the difficulty of forming and assembling the bolster beam and traction beam, and ensures the installation strength of the air spring and center pin by setting the thick reinforcement plate 6, thereby ensuring the stability of the bolster beam during use.

[0023] In one embodiment, the lower cover plate 1 of the bolster beam is made of a flat thick plate, and two sets of lower cover plates 1 are symmetrically arranged on both sides of the center pin mounting seat assembly 2. The surface of the lower cover plate 1 away from the thick patch plate 6 is provided with a downward boss 101, and the surface of the boss 101 is set as an air spring mounting surface 102. One end of the lower cover plate 1 away from the center pin mounting seat assembly 2 is set as a step. The air spring mounting surface 102 is integrally formed by machining the surface of the lower cover plate 1 away from the thick patch plate 6. Since the air spring mounting surface 102 is integrally formed by machining, the flatness and accuracy of the mounting surface are guaranteed, the installation stability and operation effect of the air spring are improved, the problem of poor stiffness matching of welding thick plates on thin plates is avoided, and welding deformation is reduced.

[0024] It should be noted that the air spring mounting surface 102 is machined from the lower cover plate 1 of the pillow beam into a downward boss 101 or an upward groove, eliminating the need for additional welding of a thick pad. This avoids the problem of poor stiffness matching when welding a thick plate onto a thin plate and reduces welding deformation.

[0025] The end of the lower cover plate 1 away from the center pin mounting seat assembly 2 is set in a stepped shape, that is, the lower cover plate 1 of the pillow beam is thinned, the welding deformation is small when it is butt welded with the side beam bevel, and the stepped structure can also prevent welding deformation from affecting the flatness of the air spring mounting surface 102.

[0026] In one embodiment, the center pin mounting bracket 2 includes a base plate 201 disposed between the lower cover plates 1 of the bolster beam. A transverse vertical plate 202 is symmetrically disposed at the top of the base plate 201, and longitudinal vertical plates 203 are symmetrically disposed between the transverse vertical plates 202. A stiffening plate 204 is disposed on one side of the longitudinal vertical plate 203. The transverse vertical plates 202 protrude from the upper cover plate 4 of the bolster beam and are welded to the lower cover plate 1 of the bolster beam using a beveled weld. The base plate 201 is made of a flat, thick plate, and the surface of the base plate 201 away from the transverse vertical plates 202 is designated as the center pin mounting surface 2011, thereby increasing the strength and bending resistance of the bolster beam and enabling it to better withstand forces and vibrations from different directions. The transverse vertical plates 202 of the center pin mounting bracket 2 protrude and are welded to the upper cover plate 1 of the bolster beam, and are also provided with several weight-reducing holes 2021. This not only maintains the structural strength through reasonable layout but also reduces the overall weight of the bolster beam, achieving a balance between strengthening and weight reduction.

[0027] It should be noted that the surface of the base plate 201 away from the horizontal vertical plate 202 is set as the center pin mounting surface 2011 and is machined, so that there is no need to weld a thick pad plate separately.

[0028] In one embodiment, for the aforementioned pillow beam web 3, a downward protrusion is provided at the center of the bottom end of the pillow beam web 3, and the protrusion is connected to the bottom plate 201 by welding, thereby realizing the connection between the pillow beam web 3 and the center pin mounting seat assembly 2.

[0029] It should be noted that the bolster beam web 3 is a continuous thick plate with a downward step protrusion in the middle, which is welded to the upper plane of the bottom plate 201 of the center pin mounting seat assembly 2. This can improve the bending resistance of the bolster beam, while reducing the thickness of the bolster beam lower cover plate 1 and thus reducing weight, and increasing the height of the bolster beam web 3.

[0030] To facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process will be described in detail below.

[0031] In practical applications, when the bogie beam is subjected to various forces and vibrations from vehicle operation, its split-type bogie beam lower cover plate 1, center pin mounting seat assembly 2, bogie beam web plate 3, and bogie beam upper cover plate 4 work together to provide stable support and resistance. Air springs are mounted on the bogie beam via air spring mounting surface 102, providing stable support for the center pin and the vehicle. The center pin is mounted on the bogie beam via center pin mounting surface 2011, connecting the bogie and the car body and transmitting various forces and vibrations. The weight-reducing design and reinforced structure of the bogie beam ensure both performance and good economy and practicality.

[0032] In summary, by utilizing the above-mentioned technical solutions of this invention, the present invention simplifies the bolster beam structure, improves the bending resistance of the bolster beam, and reduces the difficulty of forming and assembling the bolster beam and traction beam. By setting the thick patch plate 6, the installation strength of the air spring and the center pin can be guaranteed, ensuring the stability of the bolster beam during use. By setting the lower cover plate 1 of the bolster beam, since the air spring mounting surface 102 is machined in one piece, the flatness and precision of the mounting surface are guaranteed, improving the installation stability and operating effect of the air spring, avoiding the problem of poor stiffness matching when welding a thick plate onto a thin plate, and reducing welding deformation. By setting the center pin mounting seat assembly 2, the strength and bending resistance of the bolster beam are increased, enabling the bolster beam to better withstand forces and vibrations from different directions. The transverse vertical plate 202 of the center pin mounting seat assembly 2 protrudes and is welded to the upper cover plate 1 of the bolster beam, and at the same time, several weight-reducing holes 2021 are opened. This not only maintains its structural strength through reasonable layout, but also reduces the overall weight of the bolster beam, achieving a balance between strengthening and weight reduction.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bolster beam with a split lower cover plate, characterized in that, The system includes symmetrically arranged lower cover plates (1), a center pin mounting seat assembly (2) between the lower cover plates (1), a pillow beam web plate (3) on both sides of the top of the lower cover plate (1), an upper cover plate (4) on the top of the pillow beam web plate (3), a partition plate assembly (5) symmetrically arranged between the two sets of pillow beam web plates (3), and a thick patch plate (6) on the top of both the lower cover plate (1) and the center pin mounting seat assembly (2). The lower cover plate (1) of the pillow beam has a downward boss (101) on the surface away from the thick patch plate (6), and the surface of the boss (101) is set as an air spring mounting surface (102). The end of the lower cover plate (1) of the pillow beam away from the center pin mounting seat assembly (2) is set as a step shape. The air spring mounting surface (102) is integrally formed by machining the surface of the lower cover plate (1) of the pillow beam away from the thick patch plate (6); The center pin mounting bracket (2) includes a base plate (201) disposed between the lower cover plates (1) of the pillow beam. A transverse vertical plate (202) is symmetrically disposed at the top of the base plate (201). A longitudinal vertical plate (203) is symmetrically disposed between the transverse vertical plates (202). A stiffening plate (204) is disposed on one side of the longitudinal vertical plate (203). The bottom center of the web plate (3) of the pillow beam is provided with a downward protrusion, and the protrusion is connected to the bottom plate (201) by welding.

2. A pillow beam with a split lower cover plate according to claim 1, characterized in that, The lower cover plate (1) of the pillow beam is made of a flat thick plate, and the two sets of lower cover plates (1) of the pillow beam are symmetrically arranged on both sides of the center pin mounting seat assembly (2).

3. A pillow beam with a split lower cover plate according to claim 1, characterized in that, The transverse vertical plate (202) has several weight-reducing holes (2021), and the transverse vertical plate (202) and the lower cover plate (1) of the pillow beam are welded with beveled joints.

4. A pillow beam with a split lower cover plate according to claim 3, characterized in that, The base plate (201) is made of a flat thick plate, and the surface of the base plate (201) away from the horizontal vertical plate (202) is set as a center pin mounting surface (2011).

5. A pillow beam with a split lower cover plate according to claim 1, characterized in that, The upper cover plate (4) of the pillow beam and the lower cover plate (1) of the pillow beam are arranged in parallel, and the upper cover plate (4) of the pillow beam and the web plate (3) of the pillow beam are perpendicular to each other.

6. A pillow beam with a split lower cover plate according to claim 3, characterized in that, The vertical distance between the air spring mounting surface (102) and the upper cover plate (4) of the pillow beam is less than the vertical distance between the center pin mounting surface (2011) and the upper cover plate (4) of the pillow beam.

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