A low-floor chassis and rubber-wheeled train

Abstract

The application discloses a low-floor chassis and a rubber-tyred train, which comprises a driver's cabin chassis, a front goose-shaped beam, a passenger cabin chassis, a rear goose-shaped beam and a rear end beam. The upper portion of the front goose-shaped beam is provided with a first goose-shaped beam, and the upper portion of the rear goose-shaped beam is provided with a second goose-shaped beam. The second goose-shaped beam comprises a goose head and goose wings located on the two sides of the goose head. The goose head is connected with a side wall, and the goose wings are connected with the chassis downwards. The rear end beam comprises a first cross beam and a second cross beam. The first cross beam comprises a mounting beam for mounting a steering push rod. The goose wings near the tail end of the vehicle are connected with the mounting beam of the first cross beam. The mounting beam is provided with a mounting plate for mounting the steering push rod on the side towards the front of the chassis, and a gap is formed in the mounting plate. The steering push rod passes through the mounting beam. The application solves the mounting problem of the steering push rod in the low-floor area and provides a sealing plate with simple structure and high rigidity.

Description

TECHNICAL FIELD

[0001] The present application relates to a low-floor chassis and a rubber-tyred train, and belongs to the technical field of rail transit vehicle bodies. BACKGROUND

[0002] With the increase of urban population and private cars, the urban traffic congestion is becoming increasingly serious, and the average travel speed of public buses, taxis and other ground public transport tools is gradually decreasing, which seriously affects people's work and life. At present, the urban rail transit mainly includes intercity motor trains, subway trains, tramcars and light rail trains, each of which has unique advantages, but compared with road public transport, it has large investment, long construction period, high operation cost and exclusive track.

[0003] BRT, articulated buses and the like all have only one axle that can be steered, and the turning radius is large. In order to meet the normal operation of such vehicles, new roads need to be built, which is costly. In order to reduce the turning radius to adapt to the existing urban roads, the front and rear axles must be steerable, that is, the front and rear axles must be provided with steering push rods.

[0004] In the prior art, the steering push rod can be arranged in the driver's room area or the high-floor area of the tail equipment cabin, but in the low-floor chassis of the low-floor vehicle, only the driver's room and the front gull wing beam are high-floor areas, and the rear gull wing beam is a low-floor area. If the steering push rods are arranged on the front and rear axles, the low-floor area of the rear gull wing beam must also be arranged. The low-floor chassis is limited by the ground clearance and the floor height, and the structure height is small. The steering push rod will hollow out the chassis structure when passing through the structure, and the steering push rod is located on one of the main force transmission paths of the air spring, which causes the stiffness to suddenly change and the force transmission path to be interrupted.

[0005] The train weight restricts its cruising range, so lightweight is a key technical point. In order to ensure the comfort of passengers, low floor is a necessary feature. The friction between the wheels and the road is one of the main sources of vehicle noise, so the wheel area must be sealed and noise reduced.

[0006] The rubber-tyred train is connected between each section through a hinging device, and the end of the chassis must be provided with a hinging device mounting beam. The existing hinging device mounting beam adopts a structure in which a hinging support is lap-welded with a rectangular steel. Since the rectangular steel cannot be provided with a rib plate, its longitudinal stiffness is not continuous, which cannot meet the longitudinal load demand of the rubber-tyred train. The vertical load is in the shearing direction of the lap-welded joint, which cannot meet the vertical load distribution demand between trains (especially single-axle trains). The compatibility of the rectangular steel structure with the fish-belly cross-section of the chassis is poor, which leads to fragmentation of the surrounding structure and complexity of the weld. SUMMARY

[0007] The present application aims to provide a low-floor chassis and a rubber-tyred train to solve the technical problem that the steering push rod cannot be installed in the low-floor area of the chassis due to space limitations.

[0008] To achieve the above object, the technical scheme adopted by the present application is:

[0009] A low-floor chassis comprises a driver's cabin chassis, a front goose-shaped beam, a passenger cabin chassis, a rear goose-shaped beam, and a rear end beam, wherein the upper portion of the front goose-shaped beam is provided with a first goose-shaped beam, the upper portion of the rear goose-shaped beam is provided with a second goose-shaped beam, the second goose-shaped beam comprises a goose head and goose wings located on both sides of the goose head, the goose head is connected with a side wall, and the goose wings are connected with the chassis downward, the rear end beam comprises a first cross beam connected with the goose wings and a second cross beam arranged behind the first cross beam, the first cross beam comprises a mounting beam for mounting a steering push rod, and the goose wings close to the tail end of the vehicle are connected with the mounting beam of the first cross beam; the side of the mounting beam towards the front of the chassis is provided with a mounting plate for mounting the steering push rod and is provided with a clearance hole, and the steering push rod passes through the mounting beam.

[0010] Therefore, the present application sets the steering push rod on the rear end beam of the chassis, which not only ensures the structural strength of the rear end beam but also solves the technical problem that the steering push rod cannot be arranged in the low-floor area of the chassis, and the force transmission path of the goose wings and the chassis is smoothly transmitted in rigidity and strength at the position of the steering push rod.

[0011] According to the embodiments of the present application, the present application can be further optimized, and the following is the technical scheme formed after optimization:

[0012] Specifically, the mounting plate comprises an upper mounting plate and a lower mounting plate, and an activity space for the steering push rod is formed between the upper mounting plate and the lower mounting plate; the mounting plate is provided with a mounting hole; the clearance hole comprises a first clearance hole extending along the length direction of the mounting beam and a second clearance hole arranged on the opposite side of the first clearance hole.

[0013] In order to adapt to the installation of the steering push rod and ensure sufficient activity space, the structure of the rear end beam of the existing chassis is improved, and the structural strength is ensured. The activity space formed between the upper mounting plate and the lower mounting plate is the space occupied by the joint of the steering push rod, the steering push rod rotates around the joint, passes through the mounting beam, and the clearance hole is arranged on the mounting beam to avoid interference.

[0014] Specifically, a plurality of reinforcing plates are arranged inside the mounting beam; the cross-sectional width of the goose wings of the second goose-shaped beam gradually increases from top to bottom to ensure that the profile of the goose wings corresponds to the rib plate of the mounting beam.

[0015] Specifically, the second cross beam comprises hinged beams, a middle cross beam located between the two hinged beams, and side cross beams.

[0016] Specifically, the hinged beam includes a hinged bracket and a base; the base is a U-shaped beam, and a first stiffening plate is provided inside the base. Second stiffening plates are vertically provided at both ends of the open side of the base. Thin plates extending outward are provided on the second stiffening plates. The hinged beam is spliced ​​together with the middle crossbeam and the side crossbeam through the thin plates. The hinged bracket and the base have a rounded transition.

[0017] This results in a box-shaped, staggered butt weld between the hinged beam and the middle and side crossbeams. The load-bearing capacity, especially the fatigue load-bearing capacity, of the butt weld is significantly greater than that of the lap fillet weld. The staggered weld helps to avoid shear stress on the weld, and the spatial box-shaped weld structure significantly improves the structural load-bearing capacity.

[0018] Specifically, the passenger compartment base frame includes side longitudinal beams on both sides, end crossbeams at both ends of the base frame, a central longitudinal beam in the middle of the base frame, transversely arranged small crossbeams and transition beams, and the transition beams are provided between the front goose-shaped beam, the rear goose-shaped beam and the end crossbeams.

[0019] Specifically, the transition beam is triangular, with its top facing the passenger compartment underframe; the central longitudinal beam, corresponding to the door position, has a box-shaped structure.

[0020] By setting a transition beam, a smooth connection of longitudinal loads is achieved, while reducing the weight of the underframe and further reducing the overall weight of the vehicle body.

[0021] Specifically, sealing plates are provided on both the front and rear goose-shaped beams; sealing plates are provided on both sides of the first goose-shaped beam, and sealing plates are provided on both sides and the adjacent side of the second goose-shaped beam, with the sealing plates filling the gap between the goose head and the goose wing.

[0022] Specifically, the sealing plate has a groove; the sealing plate is glued to the goose-shaped beam.

[0023] The noise generated at the underframe wheels was reduced by sealing the wheel area.

[0024] Based on the same inventive concept, the present invention also provides a rubber-tired train, including the low-floor chassis as described above.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1) This invention solves the problem of installing the steering push rod in the low floor area. The force transmission path between the wing and the underframe achieves smooth transmission of stiffness and strength at the steering push rod position, reducing the turning radius of the vehicle body without affecting the structural strength of the underframe.

[0027] 2) The rear end beam of this invention is provided with longitudinal stiffeners at the hinged support position, and the continuous stiffness is conducive to the longitudinal load transfer; the internal weld is optimized from the lap fillet weld in a plane to the staggered box-shaped butt weld, and the vertical bearing capacity is significantly enhanced; since the two sides are plate beam structures, their cross-section can be designed according to the main body of the base frame, and the structure has good compatibility.

[0028] 3) This invention provides a sealing plate with a simple structure and high rigidity, which solves the problem of high noise in the wheel cabin. The adhesive fixation provides better sealing. On the other hand, the sealing plate and the main structure of the underframe do not come into direct contact with each other due to the sealant, which can avoid vibration, mutual excitation, or electrochemical corrosion between dissimilar metals in the connection area during operation.

[0029] 4) This invention provides a lightweight low-floor underframe structure, particularly a transition structure between the front and rear goose-shaped beams and the passenger compartment underframe, which enables the longitudinal load of the underframe to be transferred more smoothly. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the base frame structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the rear goose-shaped beam of the present invention;

[0032] Figure 3 This is a partial schematic diagram of the rear goose-shaped beam of the present invention;

[0033] Figure 4 This is a schematic diagram of the front structure of the mounting beam of the present invention;

[0034] Figure 5 This is a schematic diagram of the internal structure of the mounting beam of the present invention;

[0035] Figure 6 This is a schematic diagram of the back structure of the mounting beam of the present invention;

[0036] Figure 7 This is a schematic diagram of the transition beam of the present invention;

[0037] Figure 8 This is a schematic diagram of the second crossbeam structure of the present invention;

[0038] Figure 9 This is a schematic diagram of the front structure of the hinged beam of the present invention;

[0039] Figure 10 This is a schematic diagram of the back structure of the hinged beam of the present invention.

[0040] In the figure

[0041] 1-Driver's cab underframe; 2-Front goose-shaped beam; 21-First goose-shaped beam; 3-Passenger compartment underframe; 31-Side longitudinal beam; 32-End transverse beam; 33-Central longitudinal beam; 34-Small transverse beam; 35-Transition beam; 351-Upper cover plate; 352-Lower cover plate; 353-Central upright plate; 354-Side upright plate; 4-Rear goose-shaped beam; 41-Second goose-shaped beam; 411-Goose head; 412-Goose wing; 5-Rear end beam; 51-First transverse beam; 52-Second transverse beam; 521-Hinged beam; 5 211-Hinged bracket; 5212-Base; 5212a-First stiffening plate; 5212b-Second stiffening plate; 5213-Thin plate; 522-Middle crossbeam; 523-Side crossbeam; 6-Mounting beam; 61-Mounting plate; 611-Upper mounting plate; 612-Lower mounting plate; 613-Mounting hole; 62-Lean-out hole; 621-First lean-out hole; 622-Second lean-out hole; 63-Reinforcing plate; 64-Back plate; 7-Steering push rod; 8-Sealing plate; 81-Groove. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0043] like Figure 1 As shown, the low-floor underframe of this embodiment includes a driver's cab underframe 1, a front goose-shaped beam 2, a passenger compartment underframe 3, a rear goose-shaped beam 4, a rear end beam 5, and a sealing plate 8. The central passage of the driver's cab underframe 1 and the front goose-shaped beam 2 is a high-floor area, while the rest are low-floor areas. A first goose-shaped beam 21 is provided above the front goose-shaped beam 2, and a second goose-shaped beam 41 is provided above the rear goose-shaped beam 4. The second goose-shaped beam 41 includes a goose head 411 and goose wings 412 located on both sides of the goose head 411. The goose head 411 is connected to the side wall, and the goose wings 412 are connected downwards to the underframe. The rear end beam 5 includes a first crossbeam 51 and a second crossbeam 52. The first crossbeam 51 includes a mounting beam 6 for mounting the steering push rod 7. The wing 412 near the rear end of the vehicle is connected to the mounting beam 6 of the first crossbeam 51. The mounting beam 6 has a mounting plate 61 for mounting the steering push rod 7 and a clearance hole 62 on the side facing the front of the underframe. The steering push rod 7 passes through the mounting beam 6.

[0044] Rear goose-beam steering pushrod mounting structure:

[0045] like Figure 2 , Figure 3As shown, the upper part of the rear goose-shaped beam 4 is a second goose-shaped beam 41 with drooping wings. The goose head 411 connects to the side wall, and the two goose wings 412 hang down and connect to the floor plane of the underframe. The lower plane at the intersection of the goose head 411 and the two goose wings 412 is the installation position of the air spring. Near the rear of the vehicle, at the intersection of the goose wings 412 and the floor plane of the underframe, there is a first crossbeam 51, which includes a mounting beam 6 for mounting the steering push rod 7.

[0046] like Figure 4 , Figure 5 , Figure 6 As shown, the mounting plate 61 includes an upper mounting plate 611 and a lower mounting plate 612, and an active space for the movement of the steering push rod 7 is formed between the upper mounting plate 611 and the lower mounting plate 612; the mounting plate 61 has a mounting hole 613; the clearance hole 62 includes a first clearance hole 621 extending along the length direction of the mounting beam 6 and a second clearance hole 622 disposed on the opposite side of the first clearance hole 621.

[0047] The goose wing 412 gradually increases in size downwards, with the width of its lowest section exceeding the width of the first clearance hole 621. Three reinforcing plates 63 are installed within the first crossbeam 43, corresponding to the left and right sides of the goose wing 412. The maximum height of the first clearance hole 621 is close to the height of the mounting beam 6. The edge of the first clearance hole 621 is very close to the edge of the vertical surface, failing to meet welding requirements. Therefore, the mounting beam 6 is designed as a single integral part, and a third reinforcing plate 63 is installed between the two reinforcing plates 63 to increase vertical stiffness. The third reinforcing plate 63 has a notch to allow space for the movement of the steering push rod 7. A back plate 64 is also provided behind the mounting beam 6, forming a box-shaped structure. The two ends of the mounting beam 6 and the back plate 64 are respectively connected to the base frame crossbeam. Thus, the force transmission path between the goose wing 412 and the base frame achieves smooth transmission of stiffness and strength at the steering push rod position.

[0048] Preferably, the reinforcing plate 63 and the back plate 64 can be welded to the mounting beam 6 as independent parts, or they can be part of the mounting beam 6.

[0049] Lightweight low-floor base frame structure, transition structure between drive (slave) unit and passenger compartment base frame:

[0050] like Figure 1 , Figure 7As shown, the passenger compartment underframe 3 connects the front goose-shaped beam 2 and the rear goose-shaped beam 4, forming a symmetrical structure front-to-back and left-to-right, including side longitudinal beams 31, end crossbeams 32, central longitudinal beams 33, small crossbeams 34, and transition beams 35. Since the side longitudinal beams of both the front goose-shaped beam 2 and the rear goose-shaped beam 4 are interrupted by the wheel space, the longitudinal load transmission path of the vehicle is mainly through the central longitudinal beam 33. To reduce weight, the sides are weakened: since the side longitudinal beams 31 in areas other than the doors are connected to the side walls and contribute to their rigidity, only the door area is designed as a box-shaped structure to increase rigidity, while the remaining areas are open U-shaped structures. Furthermore, between the side longitudinal beams 31 and the central longitudinal beam 33, only the door pillar position is provided with a small crossbeam 34.

[0051] The passenger compartment underframe 3 includes side longitudinal beams 31 on both sides, end crossbeams 32 at both ends of the underframe, a central longitudinal beam 33 in the middle of the underframe, transversely arranged small crossbeams 34, and transition beams 35. Transition beams 35 are provided between the front goose-shaped beam 2, the rear goose-shaped beam 4, and the end crossbeams 32. The transition beams 35 are triangular, with their tops facing the passenger compartment underframe 3. The central longitudinal beam 33 has a box-shaped structure corresponding to the door position.

[0052] To achieve a smooth connection for longitudinal loads, the transition beam 35 is designed as a triangle. The transition beam 35 includes an upper cover plate 351, a lower cover plate 352, a central upright plate 353, and a side upright plate 354. The upper cover plate 351 and the lower cover plate 352 have weight-reducing holes. The central upright plate 353 connects to the longitudinal beam 21 and the central longitudinal beam 33 in the drive (driven) unit. The side upright plate 354 connects to the outer side of the goose wing 412 and the central longitudinal beam 33. An end beam 32 is provided between the transition beam 35 and the central longitudinal beam 33, thereby achieving a smooth connection between the drive (driven) unit and the central longitudinal beam 33 and forming a frame structure.

[0053] Drive (slave) unit sealing structure:

[0054] like Figure 1 As shown, sealing plates 8 are provided on both the front goose-shaped beam 2 and the rear goose-shaped beam 4. The sealing plates are thin aluminum alloy plates, formed along the edge of the main structure to be sealed, and have an array of grooved bosses on the plane other than the contact surface with the main structure to increase rigidity. The cross-section of the grooved bosses is shown in the figure. Figure 8 As shown, this can be achieved through mold forming. This eliminates the need for additional beams to supplement rigidity, reducing weight and space requirements.

[0055] The sealing plate 8 is glued to the front goose-shaped beam 2 and the rear goose-shaped beam 4. This glued fixation provides better sealing and prevents direct contact between the sealing plate and the main frame structure, thus avoiding vibration, mutual excitation, or electrochemical corrosion between dissimilar metals during operation. Preferably, secondary fastening and anti-loosening measures are also implemented using riveting or bolting, as a redundant design element.

[0056] Sealing plates 8 are provided on both the front goose-shaped beam 1 and the rear goose-shaped beam 4; sealing plates 8 are provided on both sides of the first goose-shaped beam 21, and sealing plates 8 are provided on both sides of the second goose-shaped beam 41 and on the adjacent side of the two second goose-shaped beams 41. The sealing plates 8 fill the gap between the goose head 411 and the goose wing 412. The sealing plates 8 have grooves 81 with a V-shaped cross section. The cross-sectional shape of the grooves 81 can also be circular, U-shaped or rectangular.

[0057] like Figure 1 , Figure 8 As shown, the second crossbeam 52 has a left-right symmetrical structure, including a hinged beam 521, a middle crossbeam 522 located between the two hinged beams 521, and a side crossbeam 523.

[0058] The hinged beam 521 includes a hinged bracket 5211 and a base 5212. The hinged bracket 5211 is located on the end face of the base 5212, and the hinged bracket 5211 and the base 5212 have a rounded transition. The base 5212 has a rectangular cross-section, and a first stiffening plate 5212a and a second stiffening plate 5212b are provided inside the base 5212 at positions corresponding to the hinged bracket 5211. A weight-reducing platform is provided between the two first stiffening plates 5212a and between the first stiffening plate 5212a and the second stiffening plate 5212b, and a weight-reducing hole is provided on the end face between the two first stiffening plates 5212a. The two ends of the base 5212 have U-shaped thin-walled edges, and a thin plate 5213 extending to one side is provided on the second stiffening plate 5212b. Thus, the hinged beam 521 and the middle crossbeam 522 and the side crossbeam 523 form a box-shaped, staggered butt weld. The load-bearing capacity, especially the fatigue load-bearing capacity, of butt welds is significantly greater than that of lap fillet welds. Weld misalignment helps to avoid shearing of the weld, and the spatial box-shaped weld structure significantly improves the structural load-bearing capacity.

[0059] Both the middle crossbeam 62 and the side crossbeams 63 have rectangular cross sections and are composed of U-shaped bent plates and flat plates, which are commonly used beam structures for rail vehicle bodies.

[0060] This embodiment solves the installation problem of steering pushrods in the low-floor area; provides a lightweight low-floor underframe structure, especially the transition structure between the drive (driven) unit and the passenger compartment underframe; provides a lightweight low-floor underframe, especially the area between the front and rear goose beams; provides a simple and rigid sealing plate and its installation method; longitudinal stiffeners are provided at the hinge bracket position, and the continuous rigidity is conducive to the longitudinal load transfer; the internal welds are optimized from lap fillet welds in one plane to staggered box-type butt welds, which significantly enhances the vertical load-bearing capacity; since the two sides are plate beam structures, their cross-sections can be designed according to the main body of the underframe, and the structure has good compatibility.

[0061] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

Claims

1. A low-floor chassis, comprising a driver's cab chassis (1), a front gull wing beam (2), a passenger compartment chassis (3), a rear gull wing beam (4), a rear end beam (5), two first gull wing beams (21) are arranged above the front gull wing beam (2), two second gull wing beams (41) are arranged at the upper part of the rear gull wing beam (4), the second gull wing beam (41) comprises a gull head (411) and gull wings (412) located on both sides of the gull head (411), the gull head (411) is connected with a side wall, and the gull wings (412) are connected downward with a low-floor chassis, characterized in that: The rear end beam (5) comprises a first cross beam (51) connected with the goose wing (412) and a second cross beam (52) arranged behind the first cross beam (51), the first cross beam (51) comprises a mounting beam (6) for mounting a steering push rod (7), and the goose wing (412) near the tail end of the vehicle is connected with the mounting beam (6) of the first cross beam (51). The mounting beam (6) is provided with a mounting plate (61) for mounting the steering push rod (7) on the side towards the front of the chassis and is provided with a clearance hole (62), and the steering push rod (7) passes through the mounting beam (6).

2. The low floor chassis of claim 1, wherein: The mounting plate (61) comprises an upper mounting plate (611) and a lower mounting plate (612), and the upper mounting plate (611) and the lower mounting plate (612) form a moving space for the steering push rod (7); and the mounting plate (61) is provided with a mounting hole (613). The clearance hole (62) comprises a first clearance hole (621) extending along the length direction of the mounting beam (6) and a second clearance hole (622) arranged on the opposite side of the first clearance hole (621).

3. The low floor chassis of claim 1, wherein: The mounting beam (6) is provided with a plurality of reinforcing plates (63) inside; and the sectional width of the goose wing (412) of the second goose-shaped beam (41) gradually increases from top to bottom.

4. The low floor chassis of claim 1, wherein: The second cross beam (52) comprises a hinge beam (521), a middle cross beam (522) between the two hinge beams (521), and a side cross beam (523).

5. The low floor chassis of claim 4, wherein: The hinge beam (521) comprises a hinge support (5211) and a base body (5212); the base body (5212) is a U-shaped beam, the base body (5212) is provided with a first reinforcing plate (5212a) inside, and the two ends of the opening side of the base body (5212) are vertically provided with a second reinforcing plate (5212b), and the second reinforcing plate (5212b) is provided with an outwardly extending thin plate (5213); the hinge beam (521) is spliced together with the middle cross beam (522) and the side cross beam (523) through the thin plate (5213); and the hinge support (5211) and the base body (5212) are arc transitioned.

6. The low floor chassis of claim 1, wherein: The passenger compartment chassis (3) comprises side longitudinal beams (31) on both sides, end cross beams (32) at both ends of the chassis, a central longitudinal beam (33) in the middle of the chassis, small cross beams (34) arranged transversely, and transition beams (35); the front goose-shaped beam (2) and the rear goose-shaped beam (4) are both provided with the transition beam (35) between the end cross beams (32).

7. The low floor chassis of claim 6, wherein: The transition beam (35) is triangular, and the top end of the transition beam (35) is arranged towards the passenger compartment chassis (3); and the position corresponding to the door of the central longitudinal beam (33) is a box-shaped structure.

8. The low floor chassis of claim 1, wherein: The front and rear goose-shaped beams (2, 4) are provided with sealing plates (8); the two sides of the first goose-shaped beam (21) are provided with sealing plates (8), the two sides of the second goose-shaped beam (41) and the side adjacent to the two second goose-shaped beams (41) are provided with sealing plates (8), and the sealing plates (8) fill the gaps between the goose heads (411) and the goose wings (412).

9. The low floor chassis of claim 8, wherein: The sealing plates (8) are provided with grooves (81); and the sealing plates (8) are adhesively fixed between the first goose-shaped beam (21) and the second goose-shaped beam (41).

10. A rubber-tyred train characterized by: Low-floor chassis comprising a low-floor chassis according to any one of claims 1-9.

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