Box Underframe End Structure of Railway Vehicle

Abstract

A box underframe end structure of a railway vehicle includes an underframe boundary beam, an end beam, a front draft sill, and a coupler mounting seat, and further includes a rear end cross beam located on one side in a rear of the front draft sill, an end floor fixed between the end beam and the rear end cross beam, and a coupler cross beam fixed with the coupler mounting seat into a whole. A draft sill includes the front draft sill and a rear draft sill respectively arranged on a front side and a rear side of the coupler mounting seat. The coupler cross beam, the rear end cross beam, and the end floor are welded and fixed with the underframe boundary beam. The front draft sill, the rear draft sill, and the coupler cross beam are welded and fixed on a lower surface of the end floor.

Claims

1. A box underframe end structure of a railway vehicle, comprising an underframe boundary beam, an end beam, a front draft sill, a coupler mounting seat, a rear end cross beam located on one side in a rear of the front draft sill, an end floor fixed between the end beam and the rear end cross beam, and a coupler cross beam fixed with the coupler mounting seat into a whole, wherein a draft sill comprises the front draft sill and a rear draft sill respectively arranged on a front side and a rear side of the coupler mounting seat, the coupler cross beam, the rear end cross beam, and the end floor are welded and fixed with underframe boundary beam, and the front draft sill, the rear draft sill, and the coupler cross beam are welded and fixed on a lower surface of the end floor.

2. The box underframe end structure according to claim 1, wherein the underframe boundary beam comprises a lower boundary beam located below the underframe boundary beam and close to one side of the end beam, and a left end and right end of the coupler cross beam and the end beam are welded on an inner side of the lower boundary beam.

3. The box underframe end structure according to claim 1, wherein the front draft sill has two supporting plates extending outwards towards a front end, the front end of each supporting plate is welded to the end beam, and a rear end of the each supporting plate is welded to the coupler cross beam and the coupler mounting seat.

4. The box underframe end structure according to claim 1, wherein the rear draft sill comprises two longitudinally provided units, each longitudinally provided unit having an upper draft sill and a lower draft sill, wherein the upper draft sill and the lower draft sill are welded into a whole, a top of the upper draft sill is welded to the end floor, and L front of the upper draft sill is welded to the coupler mounting seat.

5. The box underframe end structure according to claim 1, wherein the rear end cross beam is a single hollow extruded profile or the rear end cross beam is formed by butt welding two front and rear hollow extruded profiles.

6. The box underframe end structure according to claim 1, wherein a coupler hole is formed in a middle of the end beam, and welding interfaces for welding the front draft sill are provided in a rear of two sides of the coupler hole.

7. The box underframe end structure according to claim 1, wherein welding interfaces for welding the front draft sill and the rear draft sill are respectively provided on the front side and the rear side of the coupler mounting seat.

8. The box underframe end structure according to claim 1, wherein a front end of a middle floor of the railway vehicle is welded and fixed with a rear end face of the rear end cross beam.

9. The box underframe end structure according to claim 2, wherein the lower boundary beam and the underframe boundary beam are assembled and welded to form an integral boundary beam; the end floor, the rear draft sill, the coupler mounting seat, the coupler cross beam, the front draft sill, and the end beam are assembled and welded into an end underframe module; and the end underframe module and the integral boundary beam are assembled and welded into a complete end underframe structure.

10. A railway vehicle, comprising the box underframe end structure of the railway vehicle according to claim 1.

11. The railway vehicle according to claim 10, wherein the underframe boundary beam comprises a lower boundary beam located below the underframe boundary beam and close to one side of the end beam, and a left end and right end of the coupler cross beam and the end beam are welded on an inner side of the lower boundary beam.

12. The railway vehicle according to claim 10, wherein the front draft sill has two supporting plates extending outwards towards a front end, the front end of each supporting plate is welded to the end beam, and a rear end of the each supporting plate is welded to the coupler cross beam and the coupler mounting seat.

13. The railway vehicle according to claim 10, wherein the rear draft sill comprises two longitudinally provided units, each longitudinally provided unit having an upper draft sill and a lower draft sill, wherein the upper draft sill and the lower draft sill are welded into a whole, a top of the upper draft sill is welded to the end floor, and a front of the upper draft sill is welded to the coupler mounting seat.

14. The railway vehicle according to claim 10, wherein the rear end cross beam is a single hollow extruded profile or the rear end cross beam is formed by butt welding two front and rear hollow extruded profiles.

15. The railway vehicle according to claim 10, wherein a coupler hole is formed in a middle of the end beam, and welding interfaces for welding the front draft sill are provided in a rear of two sides of the coupler hole.

16. The railway vehicle according to claim 10, wherein welding interfaces for welding the front draft sill and the rear draft sill are respectively provided on the front side and the rear side of the coupler mounting seat.

17. The railway vehicle according to claim 10, wherein a front end of a middle floor of the railway vehicle is welded and fixed with a rear end face of the rear end cross beam.

18. The railway vehicle according to claim 11, wherein the lower boundary beam and the underframe boundary beam are assembled and welded to form an integral boundary beam; the end floor, the rear draft sill, the coupler mounting seat, the coupler cross beam, the front draft sill, and the end beam are assembled and welded into an end underframe module; and the end underframe module and the integral boundary beam are assembled and welded into a complete end underframe structure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic view of an underframe end structure of the present invention.

[0011] FIG. 2 is an exploded schematic view of an underframe end structure of the present invention.

[0012] FIG. 3 is a schematic view showing the connection between a rear end cross beam and an end floor in an underframe end structure of the present invention.

[0013] FIG. 4 is a schematic view showing the connection between an end floor and an end beam in an underframe end structure of the present invention.

[0014] FIG. 5 is a schematic view showing the composition of a rear draft sill of an underframe end structure of the present invention.

[0015] FIG. 6 is a schematic view showing the connection of a coupler seat and a front and rear draft sill in an underframe end structure of the present invention.

[0016] Reference numerals in the drawings are illustrated as follows: 1—rear end cross beam; 1a—first rear end cross beam; 1b—second rear end cross beam; 2—end floor; 3—rear draft sill; 3a—upper draft sill; 3b—lower draft sill; 4—lower boundary beam; 5—coupler mounting seat; 6—coupler cross beam; 7—front draft sill; 8—end beam composition; 9—underframe boundary beam; and 10—middle floor.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] As shown in FIGS. 1 and 2, a large-bearing box end underframe structure includes a rear end cross beam 1, an end floor 2, an underframe boundary beam 9, a lower boundary beam 4, an end beam 8, and a front draft sill 7, a coupler seat 5, a rear draft sill 3, and a coupler cross beam 6 located below the end floor 2. The components are connected by welding. Specifically, the lower boundary beam 4 and the underframe boundary beam 9 are assembled and welded to form an integral boundary beam. The end floor 2, the rear draft sill 3, the coupler seat 5, the coupler cross beam 6, the front draft sill 7, and the end beam 8 are assembled and welded into an end underframe module. The integral boundary beam and the end underframe module are assembled and welded to form a complete end underframe structure. The coupler cross beam 6, the rear end cross beam 1, and the end floor 2 are all welded and fixed with the underframe boundary beam 9, and the front draft sill 7, the rear draft sill 3, and the coupler cross beam 6 are welded and fixed on the lower surface of the end floor 2.

[0019] The end floor 2 is located between the end beam 8 and the rear end cross beam 1, and the front end and the rear end are respectively welded to the end beam 8 and the rear end cross beam 1. The coupler mounting seat 5 is welded and fixed at the central gap of the coupler cross beam 6. The front draft sill 7 and the rear draft sill 3 are respectively arranged on the front side and the rear side of the coupler mounting seat 5. The front draft sill 7 has two supporting plates extending outwards towards the front end, the included angle is about 40°, and the included angle can be adjusted according to design requirements. The front end of the supporting plate is welded to the end beam 8, and the rear end of the supporting plate is welded to the coupler cross beam 6 and the coupler mounting seat 5.

[0020] As shown in FIG. 3, the rear end cross beam is formed by butt welding two front and rear hollow extruded profiles (a first rear end cross beam 1a and a second rear end cross beam 1b). The rear end cross beam may also be a single profile. The rear end cross beam is plugged with and then welded to the end floor 2 formed by butt welding of the profile.

[0021] As shown in FIG. 4, the end floor 2 is plugged with and then welded to the end beam 8, and the end floor 2 is simultaneously welded to the rear end cross beam 1 to form a flat plate structure.

[0022] As shown in FIG. 5, the rear draft sill 3 includes two longitudinally provided units each having an upper draft sill 3a and a lower draft sill 3b welded together. The top of the upper draft sill 3a is welded to the end floor 2, and the front of the upper draft sill 3a is welded to the coupler mounting seat 5.

[0023] As shown in FIG. 6, the coupler seat 5, formed by butt welding two profiles, is plugged with and then welded to the front draft sill 7 and the rear draft sill 3, and is welded to two front draft sills 7 to form a horn mouth structure.

[0024] In the underframe end structure of the embodiment, the connections between the front draft sill 7 and the end floor 2, and the rear draft sill 3 and the end floor 2 are both full penetration T-joint, and the bearing capacity of the welding seam is high. The rear end cross beam 1 and the underframe boundary beam 9 have long vertical welding seam and can bear additional bending moment generated by longitudinal loads (compression: >1500KN; tensility>1000KN) acting on coupler seat 5.

[0025] The middle floor 10 of the underframe end structure of the present invention is a non-through-long floor and extends only to the rear end cross beam 1. The end floor 2, the rear end cross beam 1, the rear draft sill 3, and the underframe boundary beam 9 form six open “box” structures at the front, rear, left and right of the coupler mounting seat 5, and the end floor 2 is an important bearing component in the whole structure. The longitudinal load of the vehicle is mainly transmitted to the end floor 2 through the front draft sill 7 and the rear draft sill 3, and then uniformly transmitted to the undercarriage boundary beam through the end floor 2.

[0026] The underframe end structure of the invention can meet the requirements that the compression load is not lower than 1500 kN and the tensile load is not lower than 1000 kN. That is, the requirements of urban rail transit can be met, and the requirements of urban motor train units, inter-city motor train units, and high-speed motor train units can also be met.

[0027] In addition to the embodiments described above, other preferred embodiments of the invention are possible. All technical schemes formed by equivalent replacements or equivalent transformations fall within the scope of the present invention.