CN111959548B - Rail vehicle and chassis transition structure for connecting high-low floor thereof - Google Patents
Rail vehicle and chassis transition structure for connecting high-low floor thereof Download PDFInfo
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- CN111959548B CN111959548B CN202010905428.6A CN202010905428A CN111959548B CN 111959548 B CN111959548 B CN 111959548B CN 202010905428 A CN202010905428 A CN 202010905428A CN 111959548 B CN111959548 B CN 111959548B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F1/00—Underframes
- B61F1/08—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F1/00—Underframes
- B61F1/08—Details
- B61F1/14—Attaching or supporting vehicle body-structure
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Abstract
The invention discloses a rail vehicle and an underframe transition structure thereof connected with a high floor and a low floor, wherein the underframe transition structure is used for the low floor rail vehicle; the high-floor longitudinal beam and the low-floor longitudinal beam are longitudinally arranged oppositely, and the two ends of the transition cross beam are fixedly connected with the side beams at the two sides respectively; the transition cross beam is arranged between the high floor longitudinal beam and the low floor longitudinal beam, the cross section of the transition cross beam is Z-shaped, and the transition cross beam is configured as follows: in the horizontal projection plane, the middle transition section is positioned between the upper horizontal section and the lower horizontal section; the upper horizontal section is fixedly connected with the high floor longitudinal beam, the lower horizontal section is fixedly connected with the low floor longitudinal beam, and the middle transition section is a curved surface which protrudes obliquely upwards. According to the scheme, the rigidity of the transition area is improved through structural optimization, and the problem of overlarge stress of the boundary beam is effectively solved.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a rail vehicle and a chassis transition structure connected with high and low floors.
Background
In the design process of low-floor vehicles, the problem of load transfer at the transition position of a high floor at the vehicle end and a low floor in the middle is not solved effectively for a long time. This problem is particularly acute when the vehicle body structure is limited in size and large in load. The common problems are mainly represented by excessive stress and local deformation of the edge beam.
In view of the above, a new solution for the transition structure of the under frame of the high/low floor is needed to solve the above-mentioned drawbacks.
Disclosure of Invention
In order to solve the technical problems, the invention provides a railway vehicle and a chassis transition structure connected with high and low floors thereof, which improve the rigidity of a transition region through structural optimization and effectively solve the problem of overlarge stress of a boundary beam.
The invention provides an underframe transition structure for connecting high and low floors, which is used for low-floor railway vehicles; the high-floor longitudinal beam and the low-floor longitudinal beam are longitudinally arranged oppositely, and the two ends of the transition cross beam are fixedly connected with the side beams at the two sides respectively; the transition cross beam is arranged between the high floor longitudinal beam and the low floor longitudinal beam, the cross section of the transition cross beam is Z-shaped, and the transition cross beam is configured as follows: in the horizontal projection plane, the middle transition section is positioned between the upper horizontal section and the lower horizontal section; the upper horizontal section is fixedly connected with the high floor longitudinal beam, the lower horizontal section is fixedly connected with the low floor longitudinal beam, and the middle transition section is a curved surface which protrudes obliquely upwards.
Preferably, in a lateral projection plane, a lower edge of the side beam at a position adapted to the transition cross beam is in a curved line shape in accordance with the curvature of the middle transition section.
Preferably, the high floor stringer and the low floor stringer are each full length stringers arranged along the respective floor.
Preferably, the high floor stringer and the low floor stringer are each provided in two laterally spaced apart arrangements.
Preferably, the high floor longitudinal beam is also provided with a transition longitudinal beam section formed by longitudinally extending from the body of the high floor longitudinal beam, and the transition longitudinal beam section is provided with a top surface which is fixedly attached to the bottom surfaces of the upper horizontal section and the middle transition section of the transition cross beam; the horizontal section of the lower part of the transition cross beam and the bottom surface of the middle transition section are staggered to form step surfaces, and the end surface of the transition longitudinal beam section of the high floor longitudinal beam is fixedly connected with the step surfaces.
Preferably, the top surfaces of the bodies of the high floor longitudinal beams are aligned with the top surfaces of the upper horizontal sections of the transition cross beams, and accordingly, high floor configuration spaces are formed between the bodies of the high floor longitudinal beams arranged at intervals and between the bodies of the high floor longitudinal beams and the upper horizontal sections and the side beams at two sides of the transition cross beams.
Preferably, the high floor longitudinal beams are hollow bodies, the bottom plates of the two high floor longitudinal beams are connected into a whole at least in the areas of the transition longitudinal beam sections, and lightening holes are formed between the two transition longitudinal beam sections.
Preferably, the top surface of the low floor longitudinal beam is lower than the top surface of the lower horizontal section of the transition cross beam, and the height difference between the top surface and the top surface is consistent with the thickness of the low floor on the low floor longitudinal beam.
Preferably, the transition beam is formed by splicing a plurality of sectional materials from top to bottom.
The invention also provides a railway vehicle which comprises a vehicle body with a high-low floor, wherein the high-low floor adopts the chassis transition structure connected with the high-low floor.
Aiming at the existing low-floor railway vehicle, the invention innovatively provides an underframe transition overall design scheme for connecting a high floor and a low floor. Specifically, the underframe transition structure constructs a load transfer foundation through transition beams, two ends of which are fixedly connected with edge beams on two sides respectively, the cross section of the transition beams is Z-shaped, the middle transition section of the transition beams is positioned between the upper horizontal section and the lower horizontal section and is in a curved surface shape which is stressed better and protrudes obliquely upwards, and the upper horizontal section and the lower horizontal section are fixedly connected with a high floor longitudinal beam and a low floor longitudinal beam respectively in a longitudinal opposite manner, so that support is provided for reliable transfer of longitudinal load; meanwhile, the high-floor longitudinal beam and the low-floor longitudinal beam are oppositely arranged along the longitudinal direction, so that an optimal load transfer path is formed. Compared with the prior art, the scheme has the following beneficial technical effects:
first, use this scheme, can improve high low floor transition region's bulk strength and rigidity greatly, can effectively avoid local deformation too big through good longitudinal load transmission, can rationally control boundary beam stress.
And secondly, the cross section of the transition beam is Z-shaped, and the middle transition section of the transition beam is a curved surface which is convex obliquely upwards, so that the exposed part under the vehicle is further ensured to have a better streamline shape and better aerodynamic performance.
Thirdly, in a preferred scheme of the invention, in a lateral projection plane, the lower edge of the position, matched with the transition cross beam, of the boundary beam is in a curve shape consistent with the curvature of the middle transition section; so set up, can further avoid the stress concentration that the boundary beam position probably produced, have higher factor of safety for the automobile body and provide technical guarantee.
Fourthly, in another preferred scheme of the invention, the high-floor longitudinal beams and the low-floor longitudinal beams are all long longitudinal beams arranged along the corresponding floor respectively, so as to ensure the load transmission in the longitudinal direction of the vehicle body, further improve the rigidity of the whole vehicle and reduce the possible deformation.
Finally, in another preferred aspect of the present invention, the high floor longitudinal beam further has a transition longitudinal beam section formed by extending longitudinally from the body thereof, the transition longitudinal beam section is fixedly attached to the bottom surfaces of the upper horizontal section and the middle transition section of the transition cross beam, and the end surface of the transition longitudinal beam section is fixedly connected to the step surface of the lower horizontal section. Thereby, the overall strength and stiffness of the high-low transition zone is further improved.
Drawings
FIG. 1 is a schematic view of a transition structure of an underframe for connecting high and low floors according to an embodiment;
fig. 2 is a bottom structure diagram of the chassis transition structure shown in fig. 1.
In the figure:
the high floor longitudinal beam comprises a high floor longitudinal beam 1, a body 11, a transition longitudinal beam section 12, a bottom plate 13, lightening holes 14, a low floor longitudinal beam 2, a transition cross beam 3, an upper horizontal section 31, a middle transition section 32, a lower horizontal section 33, a step surface 34, an edge beam 4, a high floor 5 and a low floor 6.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, a schematic view of a transition structure of an underframe connecting a high-low floor according to the present embodiment is shown. The underframe transition structure is used for low-floor vehicles, so that the transition areas of a high floor and a middle low floor above a bogie at the end part of the vehicle body have better longitudinal load bearing capacity.
The underframe transition structure comprises a high floor longitudinal beam 1, a low floor longitudinal beam 2 and a transition cross beam 3; the high floor longitudinal beam 1 and the low floor longitudinal beam 2 are longitudinally arranged oppositely to form an optimal load transfer path; the transition cross beam 3 is arranged between the high floor longitudinal beam 1 and the low floor longitudinal beam 2, and two ends of the transition cross beam are respectively and fixedly connected with the side beams 4 at two sides so as to construct a load transmission foundation structure. Referring also to fig. 2, there is shown a bottom structure of the chassis transition structure shown in fig. 1.
As shown in fig. 1 and 2, the cross section of the transition beam 3 is "Z" shaped, and the specific configuration is: in the horizontal projection plane, a middle transition section 32 is located between the upper horizontal section 31 and the lower horizontal section 33; that is, along the longitudinal direction of the vehicle body, the upper horizontal section 31, the middle transition section 32 and the lower horizontal section 33 are formed by extending in sequence, and the upper horizontal section 31 and the lower horizontal section 33 have a height difference in the vertical direction and do not vertically overlap with the middle transition section 32.
The upper horizontal section 31 is fixedly connected with the high floor longitudinal beam 1, the lower horizontal section 33 is fixedly connected with the low floor longitudinal beam 2, and the middle transition section 32 is a curved surface which protrudes obliquely upwards. Here, the figures only show the high-low floor structure schematic of one end of the vehicle body, and it should be understood that the structures of the two ends of the vehicle body are arranged in a mirror image relative to the center of the vehicle body, so the detailed description is made only based on the high-low floor structure of one end.
Under the effect of longitudinal load, the curved surface-shaped middle transition section protruding towards the upper oblique direction has a better stress state, so that the integral structure provides support for reliable transmission of the longitudinal load, the integral strength and rigidity of a transition region of a high-low floor can be greatly improved, local overlarge deformation can be effectively avoided through good transmission of the longitudinal load, and the stress of the boundary beam can be reasonably controlled.
Furthermore, the middle transition section 32 is a curved surface which protrudes obliquely upwards, so that the exposed part under the vehicle can be ensured to have a better streamline shape, and the aerodynamic performance is better.
In order to avoid the stress concentration of the edge beam to the maximum extent, the edge beam 4 can be further optimized on the basis of the transition beam 3. Specifically, in the lateral projection plane, the lower edges of the side beams 4 at the positions a adapted to the transition beam 3 may be curved in accordance with the curvature of the middle transition section 32. Therefore, the stress concentration of the boundary beam 4 can be avoided by means of the higher rigidity of the transition cross beam 3, and the higher safety factor of the vehicle body is ensured
Of course, the high floor stringer 1 and the low floor stringer 2 in this solution are each full-length stringers arranged along the respective floor. That is to say, the high floor side member 1 is disposed along the longitudinal length of the high floor, and the low floor side member 2 is disposed along the longitudinal length of the low floor, so that the load transmission path constructed by longitudinally opposing the high floor and the low floor can be ensured to transmit the load more reliably in the longitudinal direction of the vehicle body, the rigidity of the whole vehicle is further improved, and the deformation which may occur is reduced.
It should be noted that the specific number of the high floor stringers 1 and the low floor stringers 2 may be determined according to the overall design of a specific product, for example, but not limited to, the high floor stringers 1 and the low floor stringers 2 shown in the drawings are both arranged as two in a laterally spaced arrangement, which can effectively meet the requirements of both the basic bearing capacity and the light weight design of the whole vehicle.
In this scheme, high floor longeron 1 and low floor longeron 2 can adopt the section bar processing, also can adopt panel welding forming.
As shown in fig. 2, the high floor longitudinal beam 1 further has a transition longitudinal beam section 12 formed by extending longitudinally from the body 11, and the transition longitudinal beam section 12 has a top surface attached and fixed to the bottom surfaces of the upper horizontal section 31 and the middle transition section 32 of the transition cross beam 3, which is equivalent to that the high floor longitudinal beam 1 is formed with a bend in the height direction, so that on the premise of ensuring smooth transition from high to low, a stress concentration area is prevented from appearing in a weld area, and better support stability is obtained; the lower horizontal section 31 of the transition cross beam 3 and the bottom surface of the middle transition section 32 are staggered to form step surfaces 34, and the end surface of the transition longitudinal beam section 12 of the high floor longitudinal beam 1 is fixedly connected with the step surfaces 34; by such arrangement, in the longitudinal projection plane of the vehicle body, the fixed joint surface of the high floor longitudinal beam 1 and the transition cross beam 3 completely covers the transition cross beam 3 along the vertical direction. Thereby, the overall strength and stiffness of the high-low transition zone is further improved.
In addition, on the basis of meeting the overall strength and rigidity, the butt joint position of the adaptive structure can be further optimized. As shown in fig. 1, the top surfaces of the bodies of the high floor stringers 1 are aligned with the top surfaces of the upper horizontal sections 31 of the transition beams 3, and accordingly, high floor 5 disposition spaces are formed between the bodies of the spaced high floor stringers 1 and between the bodies of the high floor stringers 1 and the upper horizontal sections 31 and the side sills 4 of the transition beams 3. That is, the high floor 5 is divided into a plurality of pieces.
In addition, the top surface of the low floor longitudinal beam 2 can be lower than the top surface of the lower horizontal section 33 of the transition cross beam 3, the height difference between the two is consistent with the thickness of the low floor 6 on the low floor longitudinal beam 2, and no height difference exists in the seam after the laying is finished. On the one hand, the assembly of the low floor 6 is convenient, and the actual requirement of the middle functional area of the vehicle body is fully met.
Further, the high floor stringer 1 and the low floor stringer 2 are hollow bodies. Wherein, the bottom plate 13 of the high floor longitudinal beam 1 is connected into a whole at least in the area of the transition longitudinal beam section 12, and as shown in fig. 2, a lightening hole 14 is arranged on the bottom plate 13 between the two transition longitudinal beam sections 12.
In this scheme, transition beam 3 comprises two upper and lower two parts section bar on the whole: an upper part B and a lower part C. Theoretically speaking, based on the design concept of using the section bar to splice and form the transition beam 3, other plural section bars can be spliced and formed from top to bottom, as long as the bearing capacity and the manufacturing cost can be effectively considered.
Specifically, the underframe transition structure for connecting high and low floors provided by the scheme preferably adopts aluminum alloy profiles for welding connection of all the components, has the characteristics of light weight and high rigidity, so that the underframe transition structure has higher strength and rigidity, and further ensures the transmission of load in high and low floor areas based on material selection.
In addition to the above-mentioned underframe transition structure for connecting high and low floors, the present embodiment also provides a railway vehicle comprising a vehicle body having high and low floors, wherein the high and low floors adopt the underframe transition structure for connecting the high and low floors as described above. It should be noted that other functions of the rail vehicle constitute non-core points of the invention, and those skilled in the art can implement the functions by using the prior art, so that detailed description is omitted herein.
In the description of the present invention, the terms "lateral", "longitudinal", "top" and "bottom" and the like indicate orientations or positional relationships that are defined based on a general reference of a vehicle body, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. An underframe transition structure for connecting high and low floors is used for low-floor rail vehicles; it is characterized by comprising:
the high floor longitudinal beam and the low floor longitudinal beam are longitudinally arranged oppositely;
the two ends of the transition cross beam are respectively fixedly connected with the edge beams on the two sides, the transition cross beam is arranged between the high floor longitudinal beam and the low floor longitudinal beam, the cross section of the transition cross beam is Z-shaped, and the transition cross beam is configured as follows: in the horizontal projection plane, the middle transition section is positioned between the upper horizontal section and the lower horizontal section; the upper horizontal section is fixedly connected with the high floor longitudinal beam, the lower horizontal section is fixedly connected with the low floor longitudinal beam, and the middle transition section is a curved surface which protrudes obliquely upwards.
2. The transition structure of underframe connecting high and low floors as claimed in claim 1, wherein in the lateral projection plane, the lower edge of said edge beam at the position where it fits said transition beam is in a curve shape in accordance with the curvature of said middle transition section.
3. The underframe transition structure connecting high and low floors according to claim 1 or 2, wherein the high floor stringers and the low floor stringers are all-length stringers disposed along the respective floors.
4. The floor-frame transition structure according to claim 3, wherein the high-floor longitudinal beams and the low-floor longitudinal beams are arranged in two laterally spaced-apart arrangements.
5. The underframe transition structure for connecting high and low floors according to claim 4, wherein the high floor stringer is further provided with a transition stringer section formed by longitudinally extending from the body of the high floor stringer, and the transition stringer section is provided with a top surface which is fixedly attached to the bottom surfaces of the upper horizontal section and the middle transition section of the transition beam; the horizontal section of the lower part of the transition cross beam and the bottom surface of the middle transition section are staggered to form step surfaces, and the end surface of the transition longitudinal beam section of the high floor longitudinal beam is fixedly connected with the step surfaces.
6. The floor frame transition structure of claim 5, wherein the top surfaces of the bodies of the longitudinal beams are aligned with the top surfaces of the upper horizontal sections of the transition beams, and accordingly, a space for arranging the high floor is formed between the bodies of the longitudinal beams and between the bodies and the upper horizontal sections and the side beams of the transition beams.
7. The underframe transition structure for connecting high and low floors as claimed in claim 6, wherein the high floor longitudinal beams are hollow bodies, the bottom plates of the two high floor longitudinal beams are connected into a whole at least in the region of the transition longitudinal beam sections, and lightening holes are formed between the two transition longitudinal beam sections.
8. The underframe transition structure for connecting high and low floors according to claim 3, wherein the top surface of the low floor longitudinal beam is lower than the top surface of the lower horizontal segment of the transition cross beam, and the height difference between the two is consistent with the thickness of the low floor on the low floor longitudinal beam.
9. The underframe transition structure for connecting high and low floors according to claim 3, wherein the transition cross beam is formed by splicing a plurality of profiles from top to bottom.
10. Railway vehicle comprising a body with a high-low floor, characterized in that the high-low floor is provided with an underframe transition structure connecting the high-low floor according to any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010905428.6A CN111959548B (en) | 2020-09-01 | 2020-09-01 | Rail vehicle and chassis transition structure for connecting high-low floor thereof |
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| CN202010905428.6A CN111959548B (en) | 2020-09-01 | 2020-09-01 | Rail vehicle and chassis transition structure for connecting high-low floor thereof |
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| CN111959548A CN111959548A (en) | 2020-11-20 |
| CN111959548B true CN111959548B (en) | 2022-01-25 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114194227B (en) * | 2021-12-03 | 2023-05-23 | 中车唐山机车车辆有限公司 | Rail vehicle based on modularized design |
| CN114194241A (en) * | 2021-12-03 | 2022-03-18 | 中车唐山机车车辆有限公司 | Bogie and rail vehicle |
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