Cab framework with vertical energy absorption structure

Abstract

The invention discloses a cab framework with a vertical energy absorption structure. The cab framework comprises a framework front stand column, a cab side door front stand column, a cab side door rear stand column and a car roof framework. The car roof framework is provided with a car roof front cross beam fixed to the top end of a cab side door front stand column in a lap joint mode, a car roof rear cross beam fixed to the top end of a cab side door rear stand column in a lap joint mode and a vertical energy absorption structure. The vertical energy absorption structure comprises a car roof upper longitudinal beam, a car roof lower longitudinal beam fixed between a car roof front cross beam and a car roof rear cross beam, and an energy absorption element arranged between the car roof upper longitudinal beam and the car roof lower longitudinal beam. And the front end of the roof upper longitudinal beam is lapped and fixed on the upper surface of the roof front cross beam. The newly added vertical energy absorption structure is simple, does not occupy other equipment space and is low in cost; and meanwhile, vertical load is considered in the design of a cab framework interface, and a lap joint interface is adopted for fixing, so that the conduction of vertical force is facilitated, and the safety of a cab roof and a driver is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle cab frames, and in particular to a cab frame with a vertical energy absorption structure. Background Art

[0002] Currently, the design of urban rail subway cabs is generally based on the standard "EN-12663 Structural Requirements for Rail Car Bodies." The two main parameters are the coupler compression force and the cab waist load, both of which are longitudinal forces. There are no clear numerical requirements for the vertical load requirements outside the cab in the relevant standards. Existing technologies generally focus on the bearing and transmission of longitudinal forces, with insufficient attention paid to vertical forces. The idea behind this invention originated from the crane intrusion accident on Shanghai Metro Line 11. It is believed that while focusing on longitudinal load conditions, attention should also be paid to external vertical load collisions to avoid the occurrence of small-probability vertical collisions.

[0003] Chinese invention patent CN112249073A discloses an energy-absorbing structure for the driver's cab of a subway vehicle. This invention, through the installation of end anti-collision beams, can absorb the residual kinetic energy after the coupling and anti-climber function under 25 km / h collision conditions, meeting the safety requirements of EN-15227. However, the structure lacks vertical energy absorption devices, lacking effective measures to counteract vertical loads. Furthermore, under waist load conditions, the stress at the connection between the upper longitudinal beams and the roof on both sides exceeds the limit, requiring roof reinforcement.

[0004] Chinese invention patent CN115230749B discloses a driver's cab structure and rail vehicle that alleviates the conflict between the driver's cab's visual field and interior aesthetics, facilitates the streamlined design of the train's front end, and solves the problem of excessive installation space for electric sliding plug doors. However, the front load-bearing area is too small; the driver's cab side doors cannot be pre-assembled in advance, resulting in lengthy adjustments during vehicle assembly, hindering production. Furthermore, the driver's cab lacks vertical energy-absorbing structures, making it less resilient to vertical collisions. Summary of the Invention The purpose of the present invention is to overcome the problems in the prior art of the lack of vertical energy absorption structure in the driver's cab and the poor force transition between the driver's cab and the roof of the vehicle body, and to provide a driver's cab frame with a vertical energy absorption structure, which adds a vertical energy absorption structure and changes the weld stress to structural stress, which is beneficial to resisting vertical load collision and the transfer of force between the roof and the driver's cab.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a driver's cab frame with a vertical energy absorption structure, the driver's cab frame including a front frame pillar, a driver's cab side door front pillar, a driver's cab side door rear pillar and a roof frame, characterized in that the roof frame has a roof front crossbeam overlapped and fixed to the top of the driver's cab side door front pillar, a roof rear crossbeam overlapped and fixed to the top of the driver's cab side door rear pillar, and a vertical energy absorption structure, the vertical energy absorption structure including: a roof upper longitudinal beam, a roof lower longitudinal beam fixed between the roof front crossbeam and the roof rear crossbeam, and an energy absorption element arranged between the roof upper longitudinal beam and the roof lower longitudinal beam, the front end of the roof upper longitudinal beam overlapped and fixed to the upper surface of the roof front crossbeam.

[0006] In this solution, the front cross beam of the roof frame is overlapped and fixed to the front pillar of the driver's cab side door, and the rear cross beam of the roof is overlapped and fixed to the rear pillar of the driver's cab side door. The previous weld stress is changed to external structure stress, which is conducive to bearing vertical loads. At the same time, the force transmission path between the driver's cab and the roof is increased, and the carrying capacity is improved; the added vertical energy absorption structure can use plastic deformation to reduce collision energy and reduce the damage caused by vertical collision.

[0007] Furthermore, the top of the front pillar of the driver's cab side door has a first L-shaped overlapping interface facing the front of the vehicle, and the top of the rear pillar of the driver's cab side door has a second L-shaped overlapping interface facing the front of the vehicle. The bottom surfaces of the front roof beam and the rear roof beam are respectively overlapped and fixed to the bottom surfaces of the first L-shaped overlapping interface and the second L-shaped overlapping interface, and the rear end surfaces of the front roof beam and the rear roof beam are respectively overlapped and fixed to the side walls of the first L-shaped overlapping interface and the second L-shaped overlapping interface.

[0008] Furthermore, the front cross beam of the roof is also overlapped and fixed to the top of the front pillar of the skeleton, and the top of the front pillar of the skeleton has a third L-shaped overlap interface facing the rear of the vehicle. The bottom surface of the front cross beam of the roof is overlapped and fixed to the bottom surface of the third L-shaped overlap interface, and the front end surface of the front cross beam of the roof is overlapped and fixed to the side wall of the third L-shaped overlap interface.

[0009] Furthermore, the roof upper longitudinal beams, roof lower longitudinal beams and energy absorbing elements are arranged in multiple groups laterally, including one group fixed in the middle position of the roof frame and multiple groups symmetrically distributed relative to the middle position of the roof frame.

[0010] The present invention particularly also includes a rail vehicle driver's cab, which includes the above-mentioned driver's cab frame.

[0011] The beneficial effects of the present invention are: 1. The present invention provides a vertical energy-absorbing structure on the roof frame, utilizing the plastic deformation of the energy-absorbing element to reduce collision energy and mitigate the impact on the driver's cab body. At the same time, the design of the driver's cab frame interface takes vertical loads into consideration, changing the traditional weld stress to the structural stress of the lap joint interface, thus solving the problem of poor force transition between the driver's cab and the roof of the vehicle body and facilitating the transmission of vertical force.

[0012] 2. The present invention increases the conduction of longitudinal force by overlapping and fixing the rear cross beam of the roof to the rear pillar of the driver's cab side door, which is beneficial to reducing the waist load condition and does not occupy additional space. Therefore, it has strong versatility and can be directly used for the current mask and body structure.

[0013] 3. The vertical energy-absorbing structure of the present invention is simple in design, does not occupy space for other equipment, and has low maintenance and replacement costs. In minor vertical collisions, the vertical energy-absorbing structure can be directly replaced after its travel. This is accomplished by cutting away the deformed roof upper longitudinal beam and energy-absorbing element and welding a new one in place, without affecting the normal operation of the vehicle.

[0014] 4. The front pillars of the skeleton, the front pillars of the driver's cab side door, the rear pillars of the driver's cab side door and the roof frame of the present invention can be pre-welded and assembled in advance, and the final assembly is welded through overlapping interfaces, which has high assembly efficiency and is conducive to production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a 1:4 enlarged schematic diagram of the third L-shaped overlap interface at position I in the overall structural diagram.

[0018] Figure 3 This is a 1:4 enlarged schematic diagram of the first L-shaped overlap interface at position II of the overall structure schematic diagram.

[0019] Figure 4 This is a 1:4 enlarged diagram of the second L-shaped overlap interface at position III of the overall structure diagram.

[0020] The accompanying drawings are shown as follows: 1. Front frame; 1-1. Front pillar of frame; 1-2. Crossbeam of front pillar of frame; 2. Left door of driver's cab; 3. Right door of driver's cab; 4. Roof frame; 4-1. Energy absorbing element; 4-2. Upper longitudinal beam of roof; 4-3. Lower longitudinal beam of roof; 4-4. Front crossbeam of roof; 4-5. Rear crossbeam of roof; 4-6. Diagonal support beam; 5. Front pillar of driver's cab side door; 6. Rear pillar of driver's cab side door; 7. Connecting crossbeam; 9. Connecting beam of driver's cab side door; 10. Crossbeam of driver's cab side door. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] The embodiment of the present invention has a cab frame and a rail vehicle cab with a vertical energy absorption structure, referring to Figures 1 to 4 .

[0023] like Figure 1 As shown, the driver's cab of a railway vehicle includes a front frame 1, a left door 2, a right door 3 and a roof frame 4. The left door 2 and the right door 3 are welded and fixed to the left and right sides of the rear end of the front frame 1, and the roof frame 4 is welded and fixed above the left door 2 and the right door 3. Its main structure can be found in Chinese invention patent CN112249073A. Compared with CN112249073A, the improvement of the railway vehicle driver's cab of this embodiment lies in the design of the roof frame 4 and the interface of the driver's cab frame. Specifically, a vertical energy absorption structure is added to the roof, and the interface of the driver's cab frame is improved to a structural force-bearing overlap interface, that is, the driver's cab frame with a vertical energy absorption structure in the following embodiment is adopted.

[0024] like Figure 1As shown, in this embodiment, a driver's cab frame with a vertical energy absorption structure includes a frame front column 1-1, a driver's cab side door front column 5, a driver's cab side door rear column 6 and a roof frame 4. The two frame front columns 1-1 are welded and fixed by the frame front column crossbeam 1-2 to form the front frame 1. The left driver's cab side door front column 5 and the driver's cab side door rear column 6 are welded and fixed by the driver's cab side door crossbeam 10 to form the driver's cab left door 2, and the right driver's cab side door front column 5 and the driver's cab side door rear column 6 are welded and fixed by the driver's cab side door crossbeam 10 to form the driver's cab right door 3. The frame front column 1-1 is welded and fixed to the driver's cab left door 2 and the driver's cab right door 3 by the driver's cab side door connecting beam 9. The roof frame 4 includes: a roof front crossbeam 4-4, a roof rear crossbeam 4-5 and a vertical energy absorption structure. The front roof crossbeam 4-4 is overlap-welded to the top of the driver's cab side door front pillar 5, and the rear roof crossbeam 4-5 is overlap-welded to the top of the driver's cab side door rear pillar 6. The vertical energy-absorbing structure is welded and fixed above the front and rear roof crossbeams 4-4 and 4-5. In this embodiment, the front frame 1, left and right driver's cab door 2, 3, and roof frame 4 can be pre-welded and assembled in advance. The final assembly is welded using overlapped joints, which improves assembly efficiency and facilitates production.

[0025] The vertical energy absorption structure includes an upper longitudinal beam 4-2, a lower longitudinal beam 4-3, and an energy absorption element 4-1 welded between the upper and lower longitudinal beams 4-2 and 4-3. The front end of the upper longitudinal beam 4-2 is welded to the upper surface of the front crossbeam 4-4. The front end of the upper longitudinal beam 4-2 is bent downward, which allows the applied load to be partially split into vertical and longitudinal directions. The vertical load is borne by the front column 1-1 and the driver's cab side door front column 5, while the longitudinal load is borne by the front column 1-1. The lower longitudinal beam 4-3 is welded between the front crossbeam 4-4 and the rear crossbeam 4-5. Multiple groups of the upper longitudinal beams 4-2, lower longitudinal beams 4-3, and energy absorption elements 4-1 are arranged transversely, including one group welded to the center of the roof frame 4 and multiple groups symmetrically distributed relative to the center of the roof frame 4. The rear ends of the upper longitudinal beams 4-2 are connected by a connecting crossbeam 7. In this embodiment, three groups of roof upper longitudinal beams 4-2, roof lower longitudinal beams 4-3, and energy absorbing elements 4-1 are provided: one group located in the middle of the roof frame 4 and two groups located on the lateral sides of the roof frame 4. In another embodiment, the arrangement can be adjusted according to the load and structural conditions. The rear ends of the roof lower longitudinal beams 4-3 on the lateral sides of the roof frame 4 are overlapped and welded to the upper surface of the roof rear cross beam 4-5 to transfer part of the vertical load to the roof rear cross beam 4-5. The rear ends of the roof lower longitudinal beams 4-3 in the middle of the roof frame 4 are welded and fixed to the sides of the roof rear cross beam 4-5. Diagonal support beams 4-6 are provided on both sides of the roof lower longitudinal beams 4-3 in the middle of the roof frame 4. The diagonal support beams 4-6 are welded and fixed between the roof front cross beam 4-4 and the roof rear cross beam 4-5 to reinforce the roof structure. The energy absorbing element 4-1 in this embodiment is one or more longitudinally arranged metal energy absorbing rings. Specifically, one longitudinally arranged metal energy absorbing ring is provided between the upper roof longitudinal beam 4-2 and the lower roof longitudinal beam 4-3 located in the middle position of the roof frame 4, and three longitudinally arranged metal energy absorbing rings are provided between two groups of upper roof longitudinal beams 4-2 and the lower roof longitudinal beams 4-3 located on both sides of the roof frame 4. In another embodiment, different numbers and diameters of metal energy absorbing rings can be provided according to the force and structural conditions.

[0026] like Figure 2 As shown, in this embodiment, the front roof crossbeam 4-4 is also overlap-welded to the top of the front frame pillar 1-1. A third L-shaped overlap joint is provided at the top of the front frame pillar 1-1, with the sidewalls of the third L-shaped overlap joint facing the rear of the vehicle. The bottom surface of the front roof crossbeam 4-4 is overlap-welded to the bottom surface of the third L-shaped overlap joint, and the front end surface of the front roof crossbeam 4-4 is overlap-welded to the sidewalls of the third L-shaped overlap joint. A support portion having a support plane is welded to the top of the front frame pillar 1-1. The horizontal support plane of the support portion forms a third L-shaped overlap joint with the side surface of the top of the front frame pillar 1-1.

[0027] like Figure 3As shown, in this embodiment, a first L-shaped overlap joint is provided at the top of the driver's cab side door front pillar 5, with the sidewalls of the first L-shaped overlap joint facing the front of the vehicle. The bottom surface of the front roof crossbeam 4-4 is overlap-welded to the bottom surface of the first L-shaped overlap joint, and the rear end surface of the front roof crossbeam 4-4 is overlap-welded to the sidewalls of the first L-shaped overlap joint. The first L-shaped overlap joint is cut and formed from the top of the driver's cab side door front pillar 5. The cross-section of the front roof crossbeam 4-4 is rectangular, with a V-shaped ribbed plate provided inside.

[0028] like Figure 4 As shown, in this embodiment, a second L-shaped overlap joint is provided at the top of the rear pillar 6 of the driver's cab side door. The sidewall of the second L-shaped overlap joint faces the front of the vehicle. The bottom surface of the rear roof crossbeam 4-5 is overlap-welded to the bottom surface of the second L-shaped overlap joint, and the rear end of the rear roof crossbeam 4-5 is overlap-welded to the sidewall of the second L-shaped overlap joint. The second L-shaped overlap joint is cut and formed at the top of the rear pillar 6 of the driver's cab side door.

[0029] This embodiment improves the vertical load-bearing capacity of the cab frame by providing structural stresses through the provision of first, second, and third L-shaped lap joints. This also increases the force transmission path to the roof, resolving the previous issue of poor force transition between the cab and the vehicle roof. The rear roof beams 4-5 connect to the rear pillars 6 of the cab side doors, adding longitudinal force transmission and facilitating the reduction of waist loads. This design eliminates the need for additional space, resulting in high versatility and compatibility with existing face shield + vehicle body structures.

[0030] The specific energy absorption sequence of this embodiment when subjected to a vertical load collision is: The upper longitudinal beam 4-2 on the roof is first subjected to the vertical load, and the upper longitudinal beam 4-2 deforms itself to absorb part of the energy. At the same time, the upper longitudinal beam 4-2 transfers part of the load from the front end of the upper longitudinal beam 4-2 to the front column 1-1 of the skeleton and the front column 5 of the driver's cab side door. The upper longitudinal beam 4-2 transfers another part of the load to the energy-absorbing element 4-1, and the energy-absorbing element 4-1 undergoes plastic deformation to absorb the collision energy. When the compressive deformation of the energy-absorbing element 4-1 reaches the maximum steady-state force, the remaining load is transferred from the lower longitudinal beam 4-3 on the roof to the front cross beam 4-4 and the rear cross beam 4-5 on the roof, and the load is transferred to the front column 1-1 of the skeleton, the front column 5 of the driver's cab side door and the rear column 6 of the driver's cab side door through the L-shaped lap joint, so that the body skeleton structure begins to be stressed, which can effectively protect the safety of the driver's cab roof and the driver.

[0031] Furthermore, in the event of a light vertical collision, the vertical energy-absorbing structure can be replaced after its travel. Repairs can be completed by cutting away the deformed roof upper longitudinal beam 4-2 and the metal energy-absorbing ring and then welding a new one, without affecting the normal use of the vehicle.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A driver's cab frame with a vertical energy absorption structure, the driver's cab frame comprising a frame front pillar (1-1), a driver's cab side door front pillar (5), a driver's cab side door rear pillar (6) and a roof frame (4), characterized in that: The roof frame (4) comprises a front roof crossbeam (4-4) overlapped and fixed to the top of a front upright column (5) of a driver's cab side door, a rear roof crossbeam (4-5) overlapped and fixed to the top of a rear upright column (6) of a driver's cab side door, and a vertical energy absorbing structure, wherein the vertical energy absorbing structure comprises: an upper roof longitudinal beam (4-2), a lower roof longitudinal beam (4-3) fixed between the front roof crossbeam (4-4) and the rear roof crossbeam (4-5), and an energy absorbing element (4-1) arranged between the upper roof longitudinal beam (4-2) and the lower roof longitudinal beam (4-3), wherein the front end of the upper roof longitudinal beam (4-2) is overlapped and fixed to the upper surface of the front roof crossbeam (4-4).

2. The driver's cab frame with a vertical energy absorption structure according to claim 1, characterized in that: The top of the driver's cab side door front column (5) has a first L-shaped overlap interface facing the vehicle head, the top of the driver's cab side door rear column (6) has a second L-shaped overlap interface facing the vehicle head, the bottom surfaces of the front roof cross beam (4-4) and the rear roof cross beam (4-5) are overlapped and fixed to the bottom surfaces of the first L-shaped overlap interface and the second L-shaped overlap interface respectively, and the rear ends of the front roof cross beam (4-4) and the rear roof cross beam (4-5) are overlapped and fixed to the side walls of the first L-shaped overlap interface and the second L-shaped overlap interface respectively.

3. The driver's cab frame with a vertical energy absorption structure according to claim 1, characterized in that: The front cross beam (4-4) of the roof is also overlapped and fixed to the top end of the front upright column (1-1) of the skeleton; the top end of the front upright column (1-1) of the skeleton has a third L-shaped overlap interface facing the rear end of the vehicle; the bottom surface of the front cross beam (4-4) of the roof is overlapped and fixed to the bottom surface of the third L-shaped overlap interface; and the front end surface of the front cross beam (4-4) of the roof is overlapped and fixed to the side wall of the third L-shaped overlap interface.

4. The driver's cab frame with a vertical energy absorption structure according to claim 1, characterized in that: The upper longitudinal beam (4-2), the lower longitudinal beam (4-3) and the energy absorbing element (4-1) are arranged in multiple groups transversely, including one group fixed at the middle position of the roof frame (4) and multiple groups symmetrically distributed relative to the middle position of the roof frame (4).

5. The driver's cab frame with a vertical energy absorption structure according to claim 4, characterized in that: The rear ends of the roof upper longitudinal beams (4-2) are connected via connecting cross beams (7).

6. The driver's cab frame with a vertical energy absorption structure according to claim 4, characterized in that: The rear ends of the lower longitudinal beams (4-3) on the transverse sides of the roof frame (4) are overlapped and fixed to the upper surface of the rear cross beam (4-5) of the roof.

7. The driver's cab frame with a vertical energy absorption structure according to claim 4, characterized in that: The rear end of the roof lower longitudinal beam (4-3) located in the middle of the roof frame (4) is welded and fixed to the side of the roof rear cross beam (4-5), and oblique support beams (4-6) welded and fixed between the roof front cross beam (4-4) and the roof rear cross beam (4-5) are provided on both sides of the roof lower longitudinal beam (4-3) located in the middle of the roof frame (4).

8. The driver's cab frame with a vertical energy absorption structure according to claim 1, characterized in that: The energy absorbing element (4-1) is one or more longitudinally arranged energy absorbing rings.

9. The driver's cab frame with a vertical energy absorption structure according to any one of claims 1, 2, 3, and 6, characterized in that: The overlapping fixing method is overlapping welding.

10. A rail vehicle driver's cab, characterized by: It comprises a driver's cab frame as described in any one of claims 1-9.

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