CN107878483A - A kind of 100% low-floor tramcar body construction - Google Patents

Abstract

The invention relates to a 100% low-floor tram car body structure, which is a stainless steel car body, including a roof, a side wall, an end wall, an underframe, an upper hinged mounting seat and a lower hinged mounting seat, and the roof is composed of a roof frame , roof panel and roof outer cover panel, the roof panel is fixed on the roof frame, the roof outer cover panel is installed on both sides of the roof panel, and the end wall is composed of end wall columns on both sides and an end wall panel in the middle , the top and bottom of the end wall columns are welded to the roof and the chassis respectively, the end wall panels are welded between the two end wall columns, the side walls are composed of outer cover panels, side wall panels and side wall skeletons, and the side wall panels are fixed On the side wall frame, the outer cover board is fixed on the side wall board, and the roof and the end wall and between the roof and the side wall are welded and connected by several reinforcing ribs, and weight-reducing holes are arranged on the reinforcing ribs. The overall structure of the vehicle body of the invention is simple, and while improving the overall structural strength and rigidity of the vehicle body, it also greatly reduces the weight of the vehicle body, thereby meeting the requirements for light weight of the vehicle.

Description

A 100% low-floor tram body structure

technical field

The invention belongs to the technical field of rail transit, in particular to a 100% low-floor tram car body structure.

Background technique

100% low-floor tram is one of the important tools of modern urban rail transit. It is popular among cities for its convenience for passengers, diverse marshalling, flexible operation, and sharing of existing bus stops and road resources. The car body is an important part of a 100% low-floor rail vehicle, and is the main load-carrying structure of the vehicle. The strength, stiffness, weight and other structural properties of the car body have a greater impact on the running performance of the vehicle. Therefore, it is of great significance to design a car body structure with simple structure, good strength, high rigidity and light weight.

Contents of the invention

The main purpose of the present invention is to solve the above problems and provide a 100% low-floor tram car body structure with simple overall structure, good strength and high rigidity, which can meet the higher requirements of lightweight vehicles.

For realizing the above object, technical scheme of the present invention is:

A 100% low-floor tram car body structure, which is a stainless steel car body, including a roof, side walls, end walls, underframe, upper hinged mounts and lower hinged mounts, the roof consists of a roof frame, The roof panel is composed of a roof panel and a roof outer cover panel. The roof panel is fixed on the roof frame. The roof outer cover panel is installed on both sides of the roof panel. Composed of end wall panels, the top and bottom of the end wall columns are welded to the roof and the underframe respectively, the end wall panels are welded between the two end wall columns, and the side walls are composed of outer cover panels, side walls panels and side wall frames, the side wall panels are fixed on the side wall frames, the outer cover panels are fixed on the side wall panels, a number of A reinforcing rib is welded and connected, and a lightening hole is arranged on the reinforcing rib.

Further, the end wall columns and end wall panels are bent from stainless steel plates.

Further, the end wall column includes a main body with an L-shaped cross section, L-shaped flanges bent inward on both sides of the L-shaped main body, and several strip-shaped reinforcing ribs are arranged on the L-shaped main body .

Further, a plurality of reinforcing rib plates are welded in parallel from top to bottom on the column of the end wall, and weight-reducing holes are arranged on the reinforcing rib plates.

Further, the window corners of the side wall frame are welded and connected by reinforcement plates, and the reinforcement plates are fixedly connected to the side wall frame by a plug welding process.

Further, the roof outer cover panel is fixedly connected to the roof frame through several brackets, the brackets are L-shaped, and at least one first first extending along the length direction of the vehicle body is arranged on the inner surface of the roof outer cover panel. A chute, a second chute is provided on the roof frame corresponding to the bracket, and the two sides of the bracket are respectively fixedly connected to the first chute and the second chute by bolts.

Further, the roof frame is spliced and welded by the roof side beams on both sides, the roof cross beam and the roof longitudinal beam located in the middle of the roof side beams, and multiple bolts are installed between the two roof side beams. A mounting beam for fixing the roof equipment, and the reinforcing ribs are correspondingly arranged at the ends of the roof cross beam and the roof longitudinal beam.

Further, the upper hinge mounting base is welded by a horizontal plate and a vertical plate, and a plurality of vertical rib plates are welded between the horizontal plate and the vertical plate, and the horizontal plate is welded and fixed on the roof frame superior.

Further, the underframe includes end beams at the front and rear ends, underframe side beams on both sides, two longitudinal beams and two sets of cover plates, and the two sides of the end beams are welded and fixed on the underframe side beams on both sides , the two longitudinal beams are arranged in parallel between the two underframe side beams, the two ends of the longitudinal beams are respectively welded and fixed on the end beams at the front and rear ends, and the two sets of cover plates are respectively welded and fixed on the corresponding sides On the longitudinal beams and the side beams of the underframe, the lower hinge mounting seats are respectively welded on the two end beams.

Further, the cover plate is made of bent stainless steel plate.

Further, the section of the longitudinal beam is "II" shape, and is formed by splicing and welding the upper plate, the lower plate and two side plates.

Further, the longitudinal girder is in the shape of a "several" shape in which the middle part is bent upward along the length direction of the vehicle body.

Further, a C-shaped opening is provided in the middle of the end beam, and the end of the lower hinge mounting base is embedded and installed in the C-shaped opening for welding connection.

Further, the lower hinged mounting base is a split structure, which is composed of butt welding of the front mounting base and the rear mounting base, and a plurality of side vertical plates are welded between the front mounting base and the rear mounting base. Mounting holes are arranged on the mounting base.

Further, the cover plate composition includes a cover plate longitudinal beam composition and a first cover plate and a second cover plate for installing seats, two of the first cover plates are arranged symmetrically along the length direction of the vehicle body, and the second cover plate The cover plate is installed in the middle of the two first cover plates, the longitudinal beam composition of the cover plate is fixedly connected with the side wall, and the side parts of the first cover plate and the second cover plate are welded and fixed on the longitudinal beam composition of the cover plate.

In summary, the present invention provides a 100% low-floor tram car body structure, the main body of the car body is welded by stainless steel materials, and the rational design of the car body structure not only makes the overall structure of the car body simple , and while improving the overall structural strength and rigidity of the car body, it also greatly reduces the weight of the car body, meeting the higher requirements for lightweight vehicles.

Description of drawings

Fig. 1 is a car body structure diagram of the present invention;

Fig. 2 is the structural diagram after the car body structure of the present invention is inverted;

Fig. 3 is a three-dimensional structure diagram of the end wall of the present invention;

Fig. 4 is a partial enlarged view of I of Fig. 1;

Fig. 5 is a partial enlarged view of II of Fig. 1;

Fig. 6 is a structural diagram of the vehicle body underframe of the present invention;

Fig. 7 is a partial structural diagram of the end beam of the present invention;

Fig. 8 is a structural diagram of the longitudinal beam of the present invention;

Fig. 9 is a structural view of the lower hinge mounting seat of the present invention.

As shown in Figures 1 to 9, the roof 1, the side wall 2, the end wall 3, the underframe 4, the upper hinge mounting seat 5, the lower hinge mounting seat 6, the roof frame 7, the roof panel 8, and the roof cover Panel 10, roof side rail 11, roof cross member 12, roof rail 13, mounting beam 14, bracket 15, first runner 16, second runner 17, end wall pillar 18, main body 18a, flange 18b , end wall panel 19, windshield mounting seat 20, flat panel 20a, hem 20b, outer cover panel 21, side wall column 22, reinforcement panel 24, window beam 23, reinforcement rib 25, lightening hole 26, end beam 27, chassis Side beam 28, longitudinal beam 29, cover plate composition 30, first small beam 31, second small beam 32, third small beam 33, fourth small beam 34, shock absorber mount 35, C-shaped opening 36, front Mounting seat 37, rear mounting seat 38, side vertical plate 39, mounting hole 40, cover plate stringer composition 41, first cover plate 42, second cover plate 43, first vertical beam 44, second vertical beam 45, the first vertical beam Three vertical beams 46, reinforcement plates 47, reinforcement beams 48, transverse shock absorber mounts 49, traction rod mounts 50, lateral stop mounts 51, third chute 52, rib plates 53, strip ribs 54, lightening hole 55.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

As shown in Figures 1 and 2, a 100% low-floor tram body structure provided by the present invention is a stainless steel body, including a roof 1, side walls 2, end walls 3, and an underframe 4. The upper hinged mount 5 is welded on the roof 1, and the lower hinged mount 6 is welded on the underframe 4. In order to ensure the structural strength and rigidity requirements of the car body, the main part of the car body, the roof 1, the side wall 2, the end wall 3 and the underframe 4 are welded by stainless steel materials, and the local upper hinge mounting seat 5 and the lower hinge The mounting base 6 is welded with carbon steel material to strengthen the structural strength of the local structure and improve the traction performance of the upper hinged mounting base 5 and the lower hinged mounting base 6 .

Wherein, the roof 1 is composed of a roof frame 7, a roof panel 8 and a roof outer cover panel 10, the roof panel 8 is welded and fixed on the roof frame 7, and the roof outer cover panel 10 is installed on both sides of the roof panel 8 , the roof cover panel 10 is used to shield equipment installed above the roof.

The roof frame 7 is made of stainless steel as a whole, and is spliced and welded by the roof side beams 11 on both sides, the roof cross beam 12 and the roof longitudinal beam 13 located in the middle of the roof side beams 11, and the roof side beams 11, The joints of the roof beam 12 and the roof rail 13 are all welded by L-shaped, T-shaped and cross-shaped reinforcing connectors, which are used to improve the joint strength of the joints and reduce the stress level of the joints. A plurality of mounting beams 14 for fixing roof equipment (such as a pantograph, etc.) are installed between the two roof side beams 11 through bolts, and the mounting beams 14 are arranged laterally along the vehicle body. A plurality of third sliding grooves 52 are welded on the roof side beam 11 , and the ends of the mounting beam 14 are fixed on the third sliding grooves 52 by bolts. In order to ensure the structural strength and rigidity of the roof, while reducing the weight, the roof side beams 11, the roof beams 12, the roof longitudinal beams 13 and the mounting beams 14 all adopt stainless steel "mouth" beams.

The roof outer cover panel 10 is made of fiberglass material with excellent strength and rigidity and light weight, and the roof outer cover panel 10 extends along the length direction of the vehicle body. As shown in Figure 5, the roof outer cover plate 10 is fixedly connected to the roof frame 7 through several brackets 15, the bracket 15 is an L-shaped structure as a whole, and is formed by bending a stainless steel plate, and the cross-section of the bracket 15 is also L-shaped. . On the inner surface of the roof cover plate 10, at least one first chute 16 extending along the length direction of the car body is provided. The roof cover plate 10 is integrally made of glass fiber reinforced plastics. On the roof side beam 11 of the roof frame 7, a second chute 17 is arranged corresponding to each bracket 15, and two second chute 17 are arranged side by side corresponding to each bracket 15. , the second chute 17 is welded on the roof rail 11 . The vertical side of support 15 is fixedly connected on two first chute 16 by two bolts, and the horizontal side of support 15 is fixedly connected on two second chute 17 by two bolts, in order to guarantee support 15 and The connection strength between the first chute 16 and the second chute 17 .

As shown in Figure 1, the end wall 3 is welded by the end wall columns 18 and end wall panels 19 on both sides. 19 is welded between the two end wall columns 18, and the end wall column 18 and the end wall plate 19 encircle the passing area between the two compartments. The structure of the end wall 3 is divided into two parts: the end wall column 18 and the end wall panel 19. During installation, the end wall panel 19 can be welded to the roof panel 8 and then welded to the end wall column 18, which is conducive to simplifying the end wall. 3 production process.

In this embodiment, the end wall columns 18 and the end wall panels 19 are made of bent stainless steel plates, which can greatly reduce the total weight of the end wall 3 under the premise of ensuring the structural strength and rigidity. As shown in Figure 3, the end wall column 18 includes a main body 18a with an L-shaped cross section, and L-shaped flanges 18b that are bent inward on both sides of the L-shaped main body 18a. There are several strip-shaped reinforcing ribs 54 extending in the horizontal direction parallel to the bottom. The strip-shaped reinforcing ribs 54 and the end wall columns 18 are integrally stamped and formed, and are used to greatly strengthen the end wall columns 18 while meeting the lightweight requirements. Structural strength and stiffness. In this embodiment, a plurality of stiffeners 53 are arranged in parallel on the end wall column 18 from top to bottom, the stiffeners 53 are welded on the end wall column 18, and weight-reducing holes are also arranged on the stiffeners 53, The total weight of the end wall 3 can be reduced while ensuring the structural strength of the end wall column 18 .

At the bottom of the end wall column 18, a windshield mounting seat 20 is extended toward the center of the car body for installing the windshield. The windshield mounting seat 20 is also formed by bending a stainless steel plate, and is composed of a flat plate 20a and an L-shaped hem 20b. The side of the plate 20a is welded to the end wall column 18 . The main body of the end wall panel 19 is a flat plate with flanges around it. The flanges are welded to the end wall columns 18 and the roof panels 8 on both sides respectively. The flanges at the bottom of the end wall panel 19 are L-shaped to increase its structural strength.

As shown in Fig. 1 and Fig. 2, the side wall 2 is composed of an outer cover board 21, a side wall board (not shown in the figure) and a side wall skeleton. The side wall panel is fixed on the side wall skeleton, and the outer cover plate 21 adopts glass steel plate, and is fixed on the side wall panel by glue bonding.

As shown in FIG. 4 , the side wall frame includes three side wall columns 22 , and windows are formed on the side walls, and window beams 23 are arranged above and below the windows. In this embodiment, the window corners of the side wall frame, especially the connection between the side wall column 22 and the window beam 23 are all welded and connected by the reinforcement plate 24, and the reinforcement plate 24 can be L-shaped or T-shaped according to the needs of the installation position. A reinforcement plate 24 is provided at each connection joint, and the reinforcement plate 24 is fixedly connected to the side wall column 22 and the window beam 23 through a plug welding process. This structure can not only reduce the highest stress level at the window corner , also makes the side wall meet the strength design requirements.

As shown in Figure 2, in order to improve the overall structural strength and rigidity of the car body, in this embodiment, between the roof 1 and the end wall 3 and between the roof 1 and the side wall 2 are welded and connected by several reinforcing ribs 25 . The reinforcing ribs 25 are in a triangular structure and are arranged vertically. The reinforcing ribs 25 are provided with lightening holes 26 to reduce the total weight of the vehicle body. The reinforcing rib 25 is correspondingly arranged on the ends of the roof beam 12 and the roof rail 13, that is, a reinforcing rib 25 is arranged at the end of each roof beam 12 and the roof rail 13, and the reinforcing rib 25 is connected with the roof rail 13 at the same time. The roof panel 8, the roof frame 7, the end wall panel 19 or the side wall panel are fixedly connected by welding. The weight-reducing hole 26 on each rib 25 can also provide wiring space for the equipment on the roof while playing a role in reducing weight, which can not only ensure the strength, rigidity and wiring space requirements of the whole car body, but also meet the requirements of the wiring space. Realize the lightweight purpose of the car body structure. The car body structure has good strength, high rigidity and simple structure.

The upper hinge mounting seat 5 is welded by a horizontal plate 5a and a vertical plate 5b, and a plurality of vertical rib plates 5c are welded between the horizontal plate 5a and the vertical plate 5b, and the horizontal plate 5a is welded and fixed on the roof frame 7 .

The car body is installed above the bogie. In order to reduce the total weight of the underframe under the premise of ensuring the overall structural strength and rigidity of the underframe and meet the requirements of lightweight vehicles, in this embodiment, the underframe 4 is made of stainless steel as a whole. Welded.

As shown in Figures 2 and 6, the underframe 4 includes end beams 27 at the front and rear ends, underframe side beams 28 positioned at the lateral sides of the vehicle body, two longitudinal beams 29 installed in the middle of the two underframe side beams 28 and Two sets of cover plates make up 30. Both sides of the end beam 27 are welded and fixed on the underframe side beams 28 on both sides. In order to improve the force transmission performance of the underframe, in this embodiment, two longitudinal beams 29 are set in the underframe 4, and the two longitudinal beams 29 The two ends of the front matter are respectively welded and fixed on the end beams 27 at the front and rear ends. Two groups of cover plates form 30 and are respectively welded and fixed on the longitudinal beams 29 and the underframe side beams 28 of the corresponding sides. Between the two longitudinal beams 29 is the compartment aisle floor, which is flush with the floor of the adjacent compartment. An end beam 27, two underframe side beams 28, two longitudinal beams 29 and two sets of cover plates form 30 and are arranged symmetrically around the center line of the vehicle body longitudinal direction (referring to the length direction of the vehicle body). The part of the chassis 4 in the bogie area adopts a modular design, which can realize structural interchange with the corresponding areas of other intermediate vehicles, which simplifies the production process and improves the versatility of maintenance.

As shown in Fig. 2, Fig. 6 and Fig. 8, in this embodiment, the longitudinal beam 29 is in the shape of a "ji" with the middle part bent upward along the length direction of the car body, so as to meet the space requirement of the lower bogie. In order to improve the structural strength and force transmission performance of the longitudinal beam 29, the cross section of the longitudinal beam 29 is preferably "II" shape, which is formed by splicing and welding the upper plate 29a, the lower plate 29b and two side plates 29c. The ends of the upper plate 29a, the lower plate 29b, and the two side plates 29c are respectively welded to the front and rear end beams 27, and preferably, the upper plate 29a and the lower plate 29b are in the shape of an outwardly expanded "eight" at both ends. The font structure is used to increase the welding area between the longitudinal beam 29 and the end beam 27, improve the connection strength of the longitudinal beam 29, and further improve the force transmission performance.

The side beam 28 of the chassis includes two parts, the front and the rear. The side beams of the two parts have the same structure, both of which are made of stainless steel profiles. and stiffness to reduce welding stress.

Between the two longitudinal beams 29 and between the longitudinal beams 29 and the side beams 28 of the underframe, a plurality of small beams are respectively arranged to further increase the overall structural strength and rigidity of the underframe 4 . A first small crossbeam 31 is welded and connected between the longitudinal beam 29 and the chassis side beam 28 at the front of the same side, and a second small beam 31 is also welded between the longitudinal beam 29 and the rear chassis side beam 28 at the same side. Crossbeam 32, four small crossbeams are welded between two longitudinal beams 29, the both sides that are positioned at the 3rd small crossbeam 33 of front end and rear end are respectively welded on the side surface of longitudinal beam 29 on both sides, are positioned at middle two The fourth small beam 34 is welded on the lower surface of the longitudinal beam 29 on both sides, a chute is provided on the fourth small beam 34, and a shock absorber mounting seat 35 is connected on the chute by bolts, the fourth small beam 34 Welding and fixing on the lower surface of the longitudinal beams 29 can also offset the height difference formed by the upward bending in the middle of the longitudinal beams 29, so that the floor between the two longitudinal beams 29 is even. The first small beam 31 , the second small beam 32 , and the third small beam 33 are all made of stainless steel bending structure, and the section is U-shaped or Z-shaped. The fourth small beam 34 is tailor-welded from two L-shaped stainless steel plates and a connecting plate in the middle, so as to further improve the structural strength and rigidity of the fourth small beam 34 . The connection between the fourth small beam 34 and the longitudinal beam 29 can also be welded with stiffeners to further increase the connection strength.

As shown in Figure 2 and Figure 7, in this embodiment, the end beam 27 is preferably a mouth-shaped beam, which is formed by butt welding of two U-shaped bending parts on the upper and lower sides, so as to improve the structural strength and force transmission performance of the end beam 27 , while increasing the connection strength with the lower hinged mount 6.

A C-shaped opening 36 is arranged in the middle of the end beam 27, and the front end of the lower hinged mounting base 6 is embedded and installed in the C-shaped opening 36 and connected, and the C-shaped opening 36 is in contact with the edge of the lower hinged mounting base 6. Circle welding to achieve the connection. The lower hinged mounting base 6 has a trapezoidal shape as a whole, and the width of the end connected to the C-shaped opening 36 is greater than that of the other end, so as to increase the welding area between the lower hinged mounting base 6 and the end beam 27 and increase the connection strength.

As shown in Figures 7 and 9, in order to facilitate the assembly of the lower hinged mounting base 6, the lower hinged mounting base 6 adopts a split structure, which is formed by butt welding of the front mounting base 37 and the rear mounting base 38. Two side vertical plates 39 are welded between the rear mounts 38, and the rear mounts 38 are provided with mounting holes 40 for installing hinge devices. In the middle of the lower hinge mounting base 6 there is an opening through up and down, which facilitates the installation of the hinge device while reducing the weight. Two side vertical plates 39 are respectively arranged on both sides of the opening.

The front mount 37 is in the shape of an "I" after welding, and the front-end horizontal and vertical edges of the "I" are welded to the edge circumference of the C-shaped opening 36 of the end beam 27. In order to facilitate the assembly of the lower hinged mounting base 6, the front mounting base 37 is formed by butt welding of two "T" shaped structural parts up and down, and the vertical section of the rear mounting base 38 is roughly U-shaped. The front mounting base 37 and the rear mounting base 38 are provided with welding grooves at the butt joint positions.

In this embodiment, the lower hinged mounting base 6 is made of carbon steel to improve the overall structural strength and rigidity of the lower hinged mounting base 6 . The two "T"-shaped structural members of the front mounting seat 37 and the rear mounting seat 38 are respectively cast from carbon steel to ensure strength and improve force transmission performance. The lower hinged mounting seat 6 is simple in process, has good rigidity and strength, and satisfies the requirements of load bearing and installation space.

As shown in Fig. 2 and Fig. 6, the purpose of the cover plate assembly 30 is to provide a suitable working space for the bogie assembly, and at the same time provide sufficient strength and rigidity for the seat installation on its upper part. Each set of cover plate components 30 has the same structure, including a cover plate longitudinal beam component 41 and a first cover plate 42 and a second cover plate 43 for installing seats. The first cover plate 42 is provided with two symmetrically along the length direction of the car body, and the transverse seat is installed on the first cover plate 42, and the second cover plate 43 is installed in the middle of the two first cover plates 42, and the second cover plate 43 is higher than The first cover plate 42 is installed, and the longitudinal seat is installed on the second cover plate 43 . The cover plate longitudinal beam composition 41 is used to connect the underframe and the vehicle body side wall skeleton, and the side parts of the first cover plate 42 and the second cover plate 43 are welded and fixed on the cover plate longitudinal beam composition 41 .

Cover plate stringer composition 41 is made up of cover plate stringer (not shown in the figure) and cover plate lower stringer 41a, and cover plate stringer and cover plate lower stringer 41a are arranged in parallel, on cover plate stringer and A plurality of first vertical beams 44 are arranged between the lower longitudinal beams 41a of the cover plate, and the front and rear ends of the lower longitudinal beams 41a of the cover plate are respectively welded to the side beams 28 of the underframe through the second vertical beams 45 .

The longitudinal beam on the cover plate and the lower longitudinal beam 29a on the cover plate are formed by bending stainless steel plates. The cross section of the first vertical beam 44 is U-shaped. While reducing the weight, the structural strength and rigidity of the panel stringer composition 41 can be increased.

The first cover plate 42 is made up of an upper cover plate 42a, a first end plate, a second end plate 42b, and a side plate 42c. The first end plate and the second end plate 42b are correspondingly arranged at the front and rear ends of the upper cover plate 42a, The upper cover plate 42a, the first end plate, the second end plate 42b, and the side plate 42c are formed by bending stainless steel plates, and the upper cover plate 42a is generally stepped to match the installation of the bogie components below. The bottom of the side plate 42c is welded and fixed on the upper plate 29a of the longitudinal beam 29, the front and rear ends of the side plate 42c are respectively welded with a third vertical beam 46, and the bottom of the third vertical beam 46 is also welded on the upper plate 29a of the longitudinal beam 29 superior. The other side of the first end plate is welded to the second vertical beam 45, and the side of the upper cover plate 42a is welded to the lower longitudinal beam 29a of the cover plate to meet the load-bearing requirements of the seat.

The second cover plate 43 is made up of cover plate 43a, front and rear end plate 43b, side plate 43c and bottom plate 43d, and cover plate 43a, front and rear end plate 43b, side plate 43c, bottom plate 43d are formed by bending stainless steel plate . The bottoms of the front and rear end plates 43b are welded to the upper cover plate 42a of the first cover plate 42, one side of the front and rear end plates 43b is welded to the first vertical beam 44, and the front and rear end plates 43b A reinforcing plate 47 is also welded between the other side and the upper cover plate 42a. One side of the cover plate 43a is welded to the first vertical beam 44 and the longitudinal beam on the cover plate. The side plate 43c is T-shaped and welded to the upper cover plate 42a and the second end plate 42b. The bottom plate 43d is welded to the second end plate 42b and the longitudinal beam 29, and the bottom plate 43d is flush with the aisle floor. On the upper surface of the cover plate 43a, there is also a network-shaped reinforcing beam 48 composed of cross beams and longitudinal beams, which increases the vertical stiffness of the second cover plate 43 and meets the load-bearing requirements of the seat.

On one side of the longitudinal beam 29 facing the longitudinal center line of the vehicle body, a transverse stop mounting seat 51 is provided, a transverse shock absorber mounting seat 49 is provided on the opposite side, and a traction rod mounting seat 50 is provided on its lower surface. .

The underframe structure of the present invention is made of high-strength stainless steel material as a whole, and the structure is a thin plate bending part, which not only ensures the installation space of the bogie, meets the space requirements of the passenger's riding posture, but also has light weight, high strength, high rigidity, and force transmission. The advantages of good performance. The underframe structure can ensure that the height of all floors in the car body area is not higher than 350mm, and the trafficability is strong.

As mentioned above, a similar technical solution can be derived in combination with the content of the solution given in the accompanying drawings. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the scope of the technical solutions of the present invention.

Claims (15)

1. A 100% low-floor tram car body structure is a stainless steel car body, including a roof, side walls, end walls, underframe, upper hinged mounts and lower hinged mounts, characterized in that: the car The roof is composed of a roof frame, a roof panel and a roof cover panel, the roof panel is fixed on the roof frame, the roof cover panel is installed on both sides of the roof panel, and the end wall is composed of The end wall column and the middle end wall plate are composed, the top and bottom of the end wall column are respectively welded and connected with the roof and the chassis, the end wall plate is welded between the two end wall columns, and the side wall It is composed of outer cover board, side wall board and side wall frame. The side wall board is fixed on the side wall frame. The outer cover board is fixed on the side wall board. The walls are welded and connected by several reinforcing ribs, and weight-reducing holes are arranged on the reinforcing ribs. 2. A 100% low-floor tram car body structure according to claim 1, characterized in that: the end wall columns and end wall panels are made of bent stainless steel plates. 3. A 100% low-floor tram car body structure according to claim 2, characterized in that: the end wall column comprises a main body with an L-shaped cross section, and both sides of the L-shaped main body have The inwardly bent L-shaped flange is provided with several strip-shaped reinforcing ribs on the L-shaped main body. 4. A 100% low-floor tram car body structure according to claim 3, characterized in that: a plurality of stiffener plates are welded in parallel from top to bottom on the end wall column, Lightening holes are arranged on the reinforcement plate. 5. A 100% low-floor tram car body structure according to claim 1, characterized in that: the window corners of the side wall frame are welded and connected by reinforcing plates, and the reinforcing plates are connected to the side walls The skeletons are fixedly connected by plug welding process. 6. A 100% low-floor tram car body structure according to claim 1, characterized in that: the roof outer cover plate is fixedly connected to the roof frame through several brackets, the brackets are L-shaped, At least one first chute extending along the length direction of the vehicle body is provided on the inner surface of the roof outer cover panel, and a second chute is provided on the roof frame corresponding to the bracket. The side edges are fixedly connected to the first slide groove and the second slide groove respectively by bolts. 7. A 100% low-floor tram car body structure according to claim 1, characterized in that: said roof frame consists of roof side beams on both sides and a roof cross beam located in the middle of the roof side beams It is spliced and welded with the roof rails, and a plurality of installation beams for fixing the roof equipment are installed between the two roof rails through bolts, and the reinforcing ribs are correspondingly arranged on the roof rails and roof rails the end of. 8. A 100% low-floor tram car body structure according to claim 1, characterized in that: said upper hinged mounting seat is welded by horizontal plates and vertical plates, between said horizontal plates and vertical plates A plurality of vertical stiffener plates are welded between, and the horizontal plate is welded and fixed on the roof frame. 9. A 100% low-floor tram car body structure according to claim 1, characterized in that: the underframe includes end beams at the front and rear ends, underframe side beams on both sides, two longitudinal beams and It consists of two sets of cover plates, the two sides of the end beam are welded and fixed on the side beams of the chassis on both sides, the two longitudinal beams are arranged in parallel between the two side beams of the chassis, and the two ends of the longitudinal beam Welded and fixed on the end beams at the front and rear ends respectively, the two sets of cover plates are respectively welded and fixed on the longitudinal beams and the side beams of the underframe on the corresponding sides, and the lower hinged mounting seats are respectively welded on the two end beams . 10. A 100% low-floor tram car body structure according to claim 9, characterized in that: the cover plate is made of bent stainless steel plate. 11. A 100% low-floor tram car body structure according to claim 9, characterized in that: the section of the longitudinal beam is "II" shape, and is spliced by an upper plate, a lower plate and two side plates Welded. 12. A 100% low-floor tram car body structure according to claim 9, characterized in that the longitudinal girders along the length direction of the car body are generally in the shape of a "several" with the middle part bent upwards. 13. A 100% low-floor tram car body structure according to claim 9, characterized in that: a C-shaped opening is arranged in the middle of the end beam, and the end of the lower hinged mounting base is embedded and mounted on The C-shaped opening is internally welded for connection. 14. A 100% low-floor tram car body structure according to claim 13, characterized in that: the lower hinged mounting seat is a split structure composed of a front mounting seat and a rear mounting seat butt welded, A plurality of side vertical plates are welded between the front mounting seat and the rear mounting seat, and mounting holes are arranged on the rear mounting seat. 15. A 100% low-floor tram car body structure according to claim 9, characterized in that: the cover plate composition includes a cover plate stringer composition and a first cover plate and a second cover plate for installing seats Two cover plates, two first cover plates are arranged symmetrically along the length direction of the car body, the second cover plate is installed in the middle of the two first cover plates, and the longitudinal beams of the cover plates are fixedly connected to the side walls, The side parts of the first cover plate and the second cover plate are welded and fixed on the cover plate stringer composition.