Light Rail Vehicle Motorized Bogie and Light Rail Vehicle

Abstract

The present invention relates to the field of rail vehicles, and provides a motor bogie for a light rail vehicle and a light rail vehicle. The motor bogie for the light rail vehicle comprises: a frame, including a cross beam that is hollow in the middle and plate-shaped, and L-shaped side beams that are respectively fixed at four corners of the cross beam and are arranged in pairs opposite to each other; a wheel set, including an axle and a pair of wheels mounted at both ends of the axle; axle housings, mounted at both ends of the axle and located inside the pair of wheels, a primary spring mounting seat is respectively provided on the top surface of the axle housing and the bottom surface of the L-shaped side beam, and the axle housing and the L-shaped side beam are connected by a primary spring. The upper guide post of the primary spring is fixedly inserted into the primary spring mounting seat of the L-shaped side beam, and the lower guide post of the primary spring is fixedly inserted into the primary spring mounting seat of the axle housing. This structure can meet the requirements of the lightweight of the bogie and the passing ability on small curves. The bogie structure is compact and has strong passing ability on small curves.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and particularly to a motor bogie for a light rail vehicle and a light rail vehicle. Background Art

[0002] The bogie is one of the most important components in the structure of a rail vehicle, which plays a role in supporting the car body, bearing and transmitting various loads and forces between the car body and the wheels or between the wheel-rail and the car body, evenly distributing the axle load, ensuring the safe operation of the vehicle, and enabling the vehicle to run flexibly along a straight line and pass through curves smoothly.

[0003] At present, the working conditions of different lines are different, especially the differences in the working conditions of lines in different countries are greater, and the performance requirements for rail vehicles are also different. Some countries have high requirements for the lightweight of rail vehicles and the passing ability of small curves. For example, when the curve radius of the line is 25m and any wheel is lifted by 2 inches (50.8mm), the wheel load reduction rate cannot exceed 20%, and at the same time, the displacement of the primary spring during vehicle operation is limited, which puts higher requirements on the design of the bogie. Summary of the Invention

[0004] The present invention provides a motor bogie for a light rail vehicle, which can meet the requirements of lightweight and passing ability of small curves of the bogie. The bogie has a compact structure and strong passing ability of small curves.

[0005] The present invention also provides a light rail vehicle.

[0006] A motor bogie for a light rail vehicle according to an embodiment of the present invention includes:

[0007] A frame, including a cross beam that is hollow in the middle and plate-shaped, and L-shaped side beams that are respectively fixed at four corners of the cross beam and are arranged in pairs opposite to each other;

[0008] A wheel set, including an axle and a pair of wheels installed at both ends of the axle;

[0009] Axle boxes, installed at both ends of the axle and located inside a pair of the wheels. A primary spring mounting seat is respectively provided on the top surface of the axle box and the bottom surface of the L-shaped side beam. The axle box and the L-shaped side beam are connected by a primary spring. The upper guide post of the primary spring is fixedly inserted into the primary spring mounting seat of the L-shaped side beam, and the lower guide post of the primary spring is fixedly inserted into the primary spring mounting seat of the axle box.

[0010] According to an embodiment of the present invention, a pair of the primary spring mounting seats are symmetrically provided on the top surface of each axle box with respect to the axis of the axle box, and a pair of the primary spring mounting seats are correspondingly provided on the bottom surface of the L-shaped side beam. Each axle box is positioned and connected to the L-shaped side beam by a pair of the primary springs.

[0011] According to one embodiment of the present invention, it further comprises a gear box and a drive motor, wherein the gear box is provided with an input shaft and a mounting hole arranged side by side, the drive shaft of the drive motor is connected to the input shaft of the gear box via a coupling, and the drive motor and the opposite ends of the gear box are connected via a plurality of elastic nodes, the gear box is mounted on the axle via the mounting hole, and the axle is a hollow axle;

[0012] The end of the drive motor away from the drive shaft is provided with a motor longitudinal tie rod and a vertically arranged motor mounting node, and the drive motor is connected to the frame through the motor longitudinal tie rod and the motor mounting node;

[0013] The side wall of the gear box is provided with a vertically arranged gear box suspension rod and a horizontally arranged gear box safety bracket. The gear box is connected to the frame through the gear box suspension rod and is stopped on the frame through the gear box safety bracket.

[0014] According to one embodiment of the present invention, the end of the drive motor facing the gear box is provided with at least one first mounting ear protruding toward the periphery, and the corresponding end of the gear box is provided with a plurality of second mounting ears protruding toward the periphery, the at least one first mounting ear and the plurality of second mounting ears are staggered in the circumferential direction, and the elastic node is installed in each of the first mounting ears and each of the second mounting ears.

[0015] According to one embodiment of the present invention, a brake disc and a matching brake caliper are provided on the side of the gearbox facing away from the drive motor, the brake disc is mounted on the input shaft of the gearbox, the brake caliper is mounted on the housing of the gearbox and faces the brake disc, and the brake caliper is suitable for clamping the brake disc during braking.

[0016] According to one embodiment of the present invention, it further comprises: a magnetic rail brake device, the magnetic rail brake device is installed on the outer side of the L-shaped side beam through a hanging structure, and the magnetic rail brake device is arranged along the longitudinal direction of the frame;

[0017] A mechanical manual relief device, which is arranged transversely along the frame, and comprises a connecting rod and a pair of manual relief levers connected to both ends of the connecting rod, wherein relief pull rods are respectively connected to the connection between the connecting rod and the manual relief levers, and the lower end of the relief pull rod is connected to the brake caliper on the frame;

[0018] The bolster is composed of a pair of secondary steel springs mounted on the crossbeam.

[0019] According to an embodiment of the present invention, the cross beam includes a cross beam seat plate, the middle part of the cross beam seat plate is a hollow structure, and cross beam support plates extending along the transverse direction of the cross beam are provided at four corners of the cross beam seat plate;

[0020] The L-shaped side beams correspond to the cross beam support plates one by one, and each L-shaped side beam includes an L-shaped support plate and a longitudinal seat plate. The L-shaped support plate includes a transverse support plate and a longitudinal support plate connected to the transverse support plate. The transverse support plate is disposed opposite to the cross beam support plate and is welded and connected through a transverse vertical plate. The longitudinal support plate is disposed opposite to the longitudinal seat plate and is welded and connected through a longitudinal vertical plate, and the longitudinal seat plate is welded and connected to the cross beam seat plate;

[0021] An electric motor vertical hanging seat and an electric motor anti-drop hanging seat integrally connected to the electric motor vertical hanging seat are provided inside the L-shaped side beam. A wheel set lifting seat is also provided inside the L-shaped side beam.

[0022] According to an embodiment of the present invention, lugs extending along the longitudinal direction of the cross beam are provided on the outer side of the cross beam seat plate relative to the cross beam support plates;

[0023] The longitudinal seat plate includes a longitudinal flat plate and a longitudinal arc panel that is transitionally connected to the longitudinal flat plate. The end of the longitudinal arc panel is welded to the upper surface of the lug.

[0024] According to an embodiment of the present invention, the cross beam further includes a pair of cross beam bottom plates. Along the longitudinal direction of the cross beam, the pair of cross beam bottom plates are vertically welded to opposite sides of the lower surface of the cross beam seat plate and extend along the transverse direction of the cross beam;

[0025] The cross beam bottom plate includes a first bottom plate, second bottom plates located on both sides of the first bottom plate, and a third bottom plate located on one side of the second bottom plate. The first bottom plate, the second bottom plates, and the third bottom plate are welded in sequence, and the thicknesses of the first bottom plate, the second bottom plates, and the third bottom plate decrease in sequence;

[0026] At least one wire passing hole is provided on the first bottom plate, and the wire passing holes on the pair of first bottom plates correspond to each other;

[0027] A pair of gear box mounting seats are symmetrically provided obliquely on the upper surface of the cross beam seat plate. A gear box anti-drop hanging seat is provided on the lower surface of the cross beam seat plate corresponding to the gear box mounting seat. The top surface of the gear box anti-drop hanging seat is welded to the lower surface of the cross beam seat plate, and the side surface of the gear box anti-drop hanging seat is welded to the first bottom plate;

[0028] Along the transverse direction of the crossbeam, a second series of suspension mounting holes are provided on the crossbeam seat plate between a pair of L-shaped side beams. The crossbeam seat plate is located in the hollow structure and is provided with mounting plates extending toward each other. The ends of the mounting plates are connected to vertical ribs. The two ends of the vertical ribs are respectively welded to a pair of the first bottom plates. The upper surface of the mounting plate is provided with support ribs, and the support ribs are welded to the vertical ribs.

[0029] According to one embodiment of the present invention, each of the L-shaped side beams is provided with a pair of the transverse vertical plates and a pair of the longitudinal vertical plates which are spaced apart from each other;

[0030] The transverse support plate is integrally formed with the longitudinal support plate, an extension portion is provided on the side of the transverse support plate away from the longitudinal support plate, the extension portion is welded to the crossbeam seat plate through an oblique support plate, and reinforcing ribs are provided between the oblique support plate and the transverse vertical plate.

[0031] According to one embodiment of the present invention, along the longitudinal direction of the cross beam, an L-shaped side beam connection structure for connecting a pair of L-shaped side beams is provided below the cross beam seat plate, and the L-shaped side beam connection structure includes an arched bottom plate and a plurality of reinforcing ribs connected between the arched bottom plate and the cross beam seat plate;

[0032] The arched bottom plate includes a plane bottom plate, a first curved bottom plate located on two opposite sides of the plane bottom plate, and a second curved bottom plate located on one side of the first curved bottom plate, the plane bottom plate is welded to the first curved bottom plate and the second curved bottom plate in sequence, and the thicknesses of the plane bottom plate, the first curved bottom plate and the second curved bottom plate decrease in sequence;

[0033] The position where the second arc bottom plate is welded to the lower surface of the beam seat plate corresponds to the position where the longitudinal seat plate is welded to the upper surface of the beam seat plate.

[0034] An embodiment of the present invention further provides a light rail vehicle, comprising the above-mentioned light rail vehicle motor vehicle bogie.

[0035] The light rail vehicle EMU bogie provided by the embodiment of the present invention has an axle box installed at both ends of the axle and located on the inner side of a pair of wheels, that is, the axle box is built-in. Due to the built-in axle box, the axle becomes shorter and the frame span becomes narrower, the mass of the entire bogie can be reduced, and the angular stiffness of the bogie when passing through a curve can be reduced, which is convenient for the bogie to pass through a small curve smoothly, thereby improving the small curve passing ability of the bogie; the top surface of the axle box and the bottom surface of the L-shaped side beam are respectively provided with a series of spring mounting seats, the axle box and the L-shaped side beam are connected by a series of springs, the L-shaped side beam and the axle box are opposed to each other up and down, and the axle box and the L-shaped side beam are directly connected by the series of springs, which not only realizes vibration reduction but also firmly connects the wheelset to the frame.

[0036] In addition, the L-shaped side beams correspond to the cross beam support plates one by one, and each L-shaped side beam is welded above the cross beam support plate, thereby forming a frame structure in which four L-shaped side beams are welded at the four corners of the cross beam seat plate. Each L-shaped side beam includes an L-shaped support plate and a longitudinal seat plate. The L-shaped support plate includes a transverse support plate and a longitudinal support plate connected to the transverse support plate. The transverse support plate and the longitudinal support plate are integrally formed. The extending direction of the transverse support plate is the same as that of the cross beam support plate, and the longitudinal support plate extends in a direction perpendicular to the cross beam support plate. The transverse support plate is disposed opposite to the cross beam support plate and is welded and connected through a transverse vertical plate to form a structure similar to an I-beam. The longitudinal support plate is disposed opposite to the longitudinal seat plate and is welded and connected through a longitudinal vertical plate to also form a structure similar to an I-beam. The L-shaped side beam is composed of two I-beam structures. The overall structure is simple and lightweight. Moreover, during welding, it is all welding between plates, the weld is a flat weld, the welding is simple, the weld quality is easy to guarantee, and there is no need to change the working position during welding, which is easy to operate and improves the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 is a top perspective structural schematic diagram of the motor bogie of the light rail vehicle provided by the present invention;

[0039] Figure 2 is a bottom perspective structural schematic diagram of the motor bogie of the light rail vehicle provided by the present invention;

[0040] Figure 3 is Figure 1 a structural schematic diagram of the wheel set in

[0041] Figure 4 is a cross-sectional schematic diagram of the connection between the axle box body and the L-shaped side beam in the embodiment of the present invention;

[0042] Figure 5 is a connection structural schematic diagram of the gear box and the drive motor in the embodiment of the present invention;

[0043] Figure 6 is a mounting orientation structural schematic diagram of the mechanical manual release device and the magnetic track braking device relative to the frame in the embodiment of the present invention;

[0044] Figure 7 is a structural schematic diagram of an angle of the frame in the motor bogie of the light rail vehicle provided by the present invention;

[0045] Figure 8It is a schematic structural diagram of the frame in the motor bogie of the light rail vehicle provided by the present invention from another angle;

[0046] Figure 9 It is a schematic structural diagram of the cross beam in the motor bogie of the light rail vehicle provided by the present invention.

[0047] Reference numerals:

[0048] 100, frame; 10, cross beam; 11, cross beam seat plate; 111, horizontal plate; 112, vertical plate; 113, cross beam support plate; 114, lug; 115, mounting plate; 116, vertical rib plate; 117, support rib; 118, secondary suspension mounting hole; 12, cross beam bottom plate; 121, first bottom plate; 122, second bottom plate; 123, third bottom plate; 124, wire passing hole; 13, gearbox mounting seat; 14, gearbox anti - detachment hanging seat; 20, L - shaped side beam; 21, L - shaped support plate; 211, horizontal support plate; 212, longitudinal support plate; 22, longitudinal seat plate; 23, horizontal vertical plate; 24, longitudinal vertical plate; 25, inclined support plate; 26, motor vertical hanging seat; 27, motor anti - detachment hanging seat; 28, axle - wheel lifting seat; 29, L - shaped side beam connection structure; 291, flat bottom plate; 292, first arc - shaped bottom plate; 293, second arc - shaped bottom plate; 294, reinforcing rib; 30, axle - wheel; 31, axle; 32, wheel; 40, gearbox; 41, gearbox suspension rod; 42, gearbox safety support; 43, second mounting ear; 50, driving motor; 51, motor longitudinal tie rod; 52, motor mounting node; 53, first mounting ear; 60, elastic node; 71, brake caliper; 72, brake disc; 73, magnetic track braking device; 80, mechanical manual release device; 81, connecting rod; 82, manual release lever; 83, release tie rod; 91, primary spring; 110, bolster assembly; 120, axle housing; 121, primary spring mounting seat. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0050] The following combines Figures 1 to 9 to illustrate the motor bogie of the light rail vehicle in the embodiments of the present invention. It can be understood that the bogie is divided into a motor bogie and a trailer bogie. The motor bogie is equipped with a driving device, and the driving device includes a driving motor 50 and a gearbox 40. The trailer bogie is not equipped with a driving device.

[0051] AsFigures 1 to 2 As shown, a powered bogie for a light rail vehicle provided by an embodiment of the present invention mainly includes a frame 100, a wheel set 30, and axle housings 120.

[0052] Specifically, the frame 100 includes a cross beam 10 that is hollow in the middle and plate-shaped, and L-shaped side beams 20 respectively fixed at the four corners of the cross beam 10 and arranged in pairs. That is to say, compared with the traditional well-shaped frame 100 composed of a steel pipe cross beam 10 and box-shaped side beams, the cross beam 10 in this embodiment is plate-shaped and hollow in the middle. The L-shaped side beams 20 are welded at the four corners of the cross beam 10, and the four L-shaped side beams 20 are arranged in pairs. Thus, the formed frame 100 is light in weight and good in flexibility.

[0053] The wheel set 30 in this embodiment includes an axle 31 and a pair of wheels 32 mounted at both ends of the axle 31. The axle 31 in this embodiment is a hollow axle, which can further reduce the unsprung mass of the frame 100.

[0054] In traditional bogies, the axle housing 120 is usually externally mounted, that is, the axle housing 120 is mounted on the outside of the wheel 32. In this embodiment, the axle housing 120 is mounted at both ends of the axle 31 and inside a pair of wheels 32, that is, the axle housing 120 is internally mounted. Since the axle housing 120 is internally mounted, the axle 31 becomes shorter and the span of the frame 100 becomes narrower. The mass of the entire bogie can be reduced, and the yaw stiffness when the bogie passes through a curve can be reduced, facilitating the bogie to smoothly pass through a small curve, thereby improving the small curve passing ability of the bogie.

[0055] As Figure 3 and Figure 4 shown, specifically, the specific connection method between the axle housing 120 and the frame 100 is as follows: a primary spring mounting seat 121 is respectively provided on the top surface of the axle housing 120 and the bottom surface of the L-shaped side beam 20. The axle housing 120 and the L-shaped side beam 20 are connected by a primary spring 91. The L-shaped side beam 20 and the axle housing 120 are arranged vertically, and the axle housing 120 and the L-shaped side beam 20 are directly connected by the primary spring 91, which not only realizes vibration reduction but also firmly connects the wheel set 30 and the frame 100. Specifically, the upper guide post of the primary spring 91 is fixedly inserted into the primary spring mounting seat 121 of the L-shaped side beam 20, and the lower guide post of the primary spring 91 is fixedly inserted into the primary spring mounting seat 121 of the axle housing 120. The primary spring 91 can be a primary laminated rubber spring, and the stiffness of the primary laminated rubber spring is relatively large, ensuring that the movement range of the mounting components of the frame 100 meets the technical requirements. Since the form of internally mounting the axle housing 120 is adopted, the span of the frame 100 is small, which is suitable for lines with a relatively small curve radius. Thus, the small curve passing ability of the bogie can be improved.

[0056] In order to ensure the smoothness and reliability of the connection between the axle housing 120 and the L-shaped side beam 20, according to an embodiment of the present invention, on the top surface of each axle housing 120, a pair of primary suspension spring seats 121 are symmetrically arranged with respect to the axis of the axle housing 120. On the bottom surface of the L-shaped side beam 20, a pair of primary suspension spring seats 121 are provided in one-to-one correspondence. Each axle housing 120 is positioned and connected to the L-shaped side beam 20 through a pair of primary suspension springs 91. The pair of primary suspension springs 91 are arranged on both sides of the axis of the axle housing 120 and are connected to the L-shaped side beam 20 from both sides of the axle housing 120. The connection stability is good, the force on the axle housing 120 is balanced, and thus the connection reliability with the L-shaped side beam 20 is higher.

[0057] Combined Figure 5 As shown, according to an embodiment of the present invention, it further includes a gearbox 40 and a driving motor 50. The gearbox 40 is provided with an input shaft and a mounting hole arranged side by side. The axis of the input shaft is parallel to the axis of the mounting hole. The gearbox 40 is mounted on the axle 31 through the mounting hole. The driving shaft of the driving motor 50 is connected to the input shaft of the gearbox 40 through a coupling. By driving the gearbox 40 with the driving motor 50, the wheel set 30 is driven to rotate. In this embodiment, the opposite ends between the driving motor 50 and the gearbox 40 are connected through a plurality of elastic nodes 60. The driving motor 50 and the gearbox 40 in this embodiment are directly connected. Thus, the overall structure of the driving device can be made more compact to match the characteristic of the narrow inner space of the frame 100 caused by the built-in design of the axle housing 120. By using a plurality of elastic nodes 60 to connect the opposite ends between the driving motor 50 and the gearbox 40, a flexible connection is formed between the axle housing 120 and the driving motor 50, which is beneficial for vibration reduction. The gearbox 40 and the driving motor 50 in this embodiment form an integrated driving device, with a compact overall structure and small occupied space.

[0058] In this embodiment, at one end of the driving motor 50 away from the driving shaft, a motor longitudinal tie rod 51 and a vertically arranged motor mounting node 52 are provided at intervals. Specifically, the vertically arranged motor mounting node 52 is located at the top of the end face of the driving motor 50, and the motor longitudinal tie rod 51 is located at the bottom of the end face of the driving motor 50. The driving motor 50 is connected to the frame 100 through the motor longitudinal tie rod 51 and the motor mounting node 52. The motor longitudinal tie rod 51 bears the longitudinal force of the driving motor 50, and the vertically arranged motor mounting node 52 bears the vertical force of the driving motor 50. Thus, the driving motor 50 has connection forces with the frame 100 both vertically and longitudinally, facilitating the reliable connection between the driving motor 50 and the frame 100.

[0059] In addition, it should be noted that a motor vertical suspension seat 26 mentioned below is provided on the frame 100. One end of the vertically arranged motor mounting node 52 is connected to the driving motor 50, and the other end is connected to the motor vertical suspension seat 26.

[0060] In this embodiment, the side wall of the gear box 40 is provided with a vertically arranged gear box suspension rod 41 and a horizontally arranged gear box safety support 42. The gear box 40 is connected to the frame 100 through the gear box suspension rod 41 to ensure the reliability of the gear box 40 after installation. In addition, the gear box 40 is stopped on the frame 100 by the gear box safety support 42. The provision of the gear box safety support 42 is helpful to prevent the gear box 40 from falling off. The specific anti-falling of the gear box 40 will be described in detail below.

[0061] According to one embodiment of the present invention, in order to facilitate the installation of the elastic node 60, the end of the drive motor 50 facing the gear box 40 is provided with at least one first mounting ear 53 protruding toward the outer periphery thereof, and the corresponding end of the gear box 40 is provided with a plurality of second mounting ears 43 protruding toward the outer periphery thereof, at least one first mounting ear 53 and a plurality of second mounting ears 43 are staggered in the circumferential direction of the opposite ends of the drive motor 50 and the gear box 40, and each first mounting ear 53 and each second mounting ear 43 are provided with a through hole, and the elastic node 60 is installed in each through hole. In this embodiment, two first mounting ears 53 and three second mounting ears 43 are provided as an example, and one end of the two elastic nodes 60 is fastened in the first mounting ear 53, and the other end is fixed to the end of the gear box 40 by a fastener, and accordingly, one end of the three elastic nodes 60 is fastened in the second mounting ear 43, and the other end is fixed to the end of the drive motor 50 by a fastener. A plurality of elastic nodes 60 spaced apart along the circumferential direction are arranged at opposite ends of the drive motor 50 and the gear box 40. On the one hand, this ensures that the force on the drive motor 50 and the gear box 40 is balanced after being connected. On the other hand, it ensures that the connection between the drive motor 50 and the gear box 40 has sufficient elasticity, thereby ensuring the vibration reduction effect.

[0062] According to one embodiment of the present invention, a brake disc 72 and a matching brake caliper 71 are provided on the side of the gear box 40 away from the drive motor 50. The brake disc 72 is mounted on the input shaft of the gear box 40. It can be understood that one end of the input shaft of the gear box 40 is connected to the drive motor 50, and the other end is connected to the brake disc 72. When the input shaft rotates, the brake disc 72 rotates with the input shaft; the brake caliper 71 is mounted on the housing of the gear box 40 and faces the brake disc 72. The brake caliper 71 is suitable for holding the brake disc 72 during braking. In this embodiment, the brake disc 72 and the brake caliper 71 are both mounted on the gear box 40, which further compacts the space between the drive device and the brake device, so that the drive device and the brake device are more closely connected to adapt to the compact space inside the frame 100.

[0063] like Figure 6 As shown, according to one embodiment of the present invention, the bogie further comprises a magnetic rail brake device 73, which is used in conjunction with a brake disc 72 and a brake caliper 71 for train braking, thereby making the braking performance more reliable.

[0064] In this embodiment, the magnetic track braking device 73 is installed on the outer side of the L-shaped side beam 20 through a hanging structure. The magnetic track braking device 73 is strip-shaped, with a small structural occupied space. The magnetic track braking device 73 is arranged longitudinally along the frame 100. The brake disc 72, the brake caliper 71 and the magnetic track braking device 73 are respectively arranged on the inner and outer sides of the L-shaped side beam 20 and are oppositely arranged, which is convenient for train braking.

[0065] It should be noted that in this embodiment, the so-called "inner side" and "outer side" are referenced with the frame 100. The space between a pair of side beams of the frame 100 is the "inner side", and the space outside a pair of side beams is the "outer side".

[0066] Continue to refer to Figure 6 , in order to avoid the inability to release the parking brake at extremely low temperatures, such as minus 20 degrees, this embodiment also provides a mechanical manual release device 80. The mechanical manual release device 80 is arranged transversely along the frame 100 and is arranged above the frame 100. It includes a connecting rod 81 and a pair of manual release levers 82 connected to both ends of the connecting rod 81. Relief pull rods 83 are respectively connected at the connection points of the connecting rod 81 and the manual release levers 82. The lower ends of the relief pull rods 83 are connected to the brake calipers on the frame 100, specifically the parking swing arms of the brake calipers; when it is necessary to release the parking brake, pulling up the manual release lever 82 can drive the relief pull rod 83 to drive the parking swing arm of the brake caliper to rotate, thereby realizing the release of the brake caliper.

[0067] This embodiment also provides a bolster assembly 110. The bolster assembly 110 is installed on the cross beam 10 through a pair of secondary steel springs. The cross beam 10 is provided with a pair of secondary suspension mounting holes 118. One end of a pair of secondary steel springs is installed in a pair of secondary suspension mounting holes 118, and the other end is connected to the bolster assembly.

[0068] In this embodiment, as Figures 7 to 9 shown, the cross beam 10 includes a cross beam seat plate 11. The cross beam seat plate 11 is a plate-like structure. The middle part of the cross beam seat plate 11 is a hollow structure. The hollow structure divides the cross beam seat plate 11 into a pair of transverse plates 111 and a pair of longitudinal plates 112 that are opposite to each other in pairs and enclose a shape similar to a "mouth". Transverse beam support plates 113 extending transversely along the cross beam 10 are provided at the four corners of the cross beam seat plate 11.

[0069] It should be explained that in this embodiment, the so-called "transverse" and "longitudinal" are both referenced with the orientation of the bogie installed on the light rail vehicle. The direction along the running direction of the light rail vehicle is "longitudinal", and the direction along the width direction of the light rail vehicle is "transverse".

[0070] In this embodiment, the crossbeam seat plate 11 is a single-piece plate structure and can be processed into an integral structure with crossbeam support plates 113. Since the crossbeam 10 is mainly a plate structure, compared with the crossbeam 10 structure made of steel pipes in the past, the weight is significantly reduced.

[0071] In this embodiment, the L-shaped side beams 20 correspond to the crossbeam support plates 113 one by one. That is to say, there are four L-shaped side beams 20. Each L-shaped side beam 20 is welded above the crossbeam support plate 113, so as to form a frame 100 structure in which four L-shaped side beams 20 are welded at the four corners of the crossbeam seat plate 11. Specifically, each L-shaped side beam 20 includes an L-shaped support plate 21 and a longitudinal seat plate 22. The L-shaped support plate 21 includes a transverse support plate 211 and a longitudinal support plate 212 connected to the transverse support plate 211. The transverse support plate 211 and the longitudinal support plate 212 are integrally formed. The transverse support plate 211 is in the same extending direction as the crossbeam support plate 113, and the longitudinal support plate 212 extends in a direction perpendicular to the crossbeam support plate 113.

[0072] In this embodiment, the transverse support plate 211 and the crossbeam support plate 113 are arranged opposite to each other and are welded and connected through a transverse vertical plate 23 to form a structure similar to an I-beam. The longitudinal support plate 212 and the longitudinal seat plate 22 are arranged opposite to each other and are welded and connected through a longitudinal vertical plate 24, and similarly form a structure similar to an I-beam. It can be seen that the L-shaped side beam 20 is composed of two I-beam structures. The overall structure is simple and light in weight. Moreover, during welding, it is all welding between plates, the weld is a flat weld, the welding is simple, the weld quality is easy to guarantee, and there is no need to change the working position during welding, which is easy to operate and improves the welding efficiency. In this embodiment, the L-shaped side beam 20 structure is an open I-beam structure, which provides better operating space for the welding of the L-shaped side beam 20 and the crossbeam seat plate 11 and ensures the welding quality of the key welds.

[0073] In this embodiment, the L-shaped side beams 20 and the crossbeam 10 can be processed separately. After the L-shaped side beams 20 are assembled by welding, they are then welded to the crossbeam seat plate 11 of the crossbeam 10, with high welding efficiency and high processing efficiency of the frame 100.

[0074] To ensure the structural strength of the L-shaped side beam 20, the transverse vertical plate 23 and the longitudinal vertical plate 24 overlap and are welded.

[0075] It can be understood that the extending directions of the transverse vertical plate 23 and the longitudinal vertical plate 24 are both along the vertical direction of the frame 100.

[0076] To ensure the structural strength, the longitudinal seat plate 22 is welded to the crossbeam seat plate 11. In addition, the length of the longitudinal seat plate 22 is less than the lengths of the longitudinal vertical plate 24 and the longitudinal support plate 212, such that a part of the longitudinal vertical plate 24 is welded to the longitudinal seat plate 22, and another part is welded to the surface of the crossbeam seat plate 11. Thereby, the welding area between the L-shaped side beam 20 and the crossbeam seat plate 11 can be increased, thus ensuring the stability after the L-shaped side beam 20 is welded to the crossbeam 10.

[0077] In this embodiment, four L-shaped side beams 20 are welded to the crossbeam 10 having a pair of cross plates 111 and a pair of longitudinal plates 112 to form a frame 100 structure similar to a "well" shape, and the welded flexible frame 100 is formed, which is convenient for installing the above-mentioned wheel set 30 and axle housing 120 to form a bogie with strong small curve passing ability.

[0078] According to an embodiment of the present invention, in order to facilitate the welding of the longitudinal seat plate 22 to the crossbeam seat plate 11, the crossbeam seat plate 11 is provided with a lug 114 extending longitudinally along the crossbeam 10 on the outer side of the crossbeam support plate 113. The lug 114 is a plate-like structure similar to the crossbeam support plate 113, and the length of the lug 114 is slightly shorter than the length of the crossbeam support plate 113.

[0079] Considering from the perspective of force, in order to avoid stress concentration, the longitudinal seat plate 22 includes a longitudinal flat plate and a longitudinal arc panel that is transitionally connected to the longitudinal flat plate. The end of the longitudinal arc panel is welded to the upper surface of the lug 114.

[0080] To ensure the structural strength of the crossbeam 10, according to an embodiment of the present invention, the crossbeam 10 further includes a pair of crossbeam bottom plates 12. Along the longitudinal direction of the crossbeam 10, the pair of crossbeam bottom plates 12 are vertically welded to the opposite sides of the lower surface of the crossbeam seat plate 11 and extend along the transverse direction of the crossbeam 10. The crossbeam 10 integrally forms a T-shaped welding structure, which simplifies the structure of the crossbeam 10 and reduces the self-weight of the frame 100; that is, a pair of crossbeam bottom plates 12 are welded below a pair of cross plates 111 of the crossbeam seat plate 11, and the length direction of the crossbeam bottom plates 12 is the same as the length direction of the cross plates 111. By adding the crossbeam bottom plates 12, the structural strength of the crossbeam 10 can be enhanced, and it is also convenient for installing some components.

[0081] Specifically, the crossbeam bottom plate 12 includes a first bottom plate 121, second bottom plates 122 located on both sides of the first bottom plate 121, and third bottom plates 123 located outside each second bottom plate 122. That is to say, the crossbeam bottom plate 12 includes one first bottom plate 121, two second bottom plates 122, and two third bottom plates 123. The first bottom plate 121, the second bottom plates 122, and the third bottom plates 123 are welded in sequence, and the thicknesses of the first bottom plate 121, the second bottom plates 122, and the third bottom plates 123 decrease in sequence. That is to say, the thickness of the first bottom plate 121 is the largest. The first bottom plate 121 is located at the center of the crossbeam bottom plate 12, and it is necessary to install the gearbox anti - detachment hanging seat 14 described below, and it is necessary to jointly bear the weight after the gearbox 40 is installed on the gearbox mounting seat 13 with the crossbeam seat plate 11. Therefore, the first bottom plate 121 needs to ensure sufficient strength, so the thickness of the first bottom plate 121 needs to be greater than the thicknesses of the bottom plates in other parts. Since the second bottom plates 122 and the third bottom plates 123 do not need to bear a large weight, and the second bottom plates 122 play a transitional role and bear a greater weight than the third bottom plates 123, the thicknesses of the first bottom plate 121, the second bottom plates 122, and the third bottom plates 123 are decreased in sequence. With such a setting, while ensuring the structural strength of the crossbeam bottom plate 12, weight reduction is achieved. The crossbeam bottom plate 12 and the crossbeam seat plate 11 are welded plate to plate, which is convenient for welding and the weld quality is easy to control.

[0082] It can be seen that splitting the crossbeam bottom plate 12 into three plates with different thicknesses reduces the weight of the frame 100 on the basis of ensuring reliable structural strength.

[0083] In a specific embodiment, at least one wire - passing hole 124 is provided on the first bottom plate 121. Preferably, two wire - passing holes 124 are provided on the first bottom plate 121 at intervals. The wire - passing holes 124 on a pair of first bottom plates 121 correspond one by one, which is convenient for the installation of pipe clamps and wire clamps, eliminating the need to weld pipe clamp seats and wire clamp seats on the crossbeam 10. Selecting to open holes on the first bottom plate 121 does not affect the structural strength of the crossbeam 10.

[0084] In a specific embodiment, on the upper surface of the crossbeam seat plate 11, specifically on the upper surface of the above - mentioned cross - plate 111, a pair of gearbox mounting seats 13 are symmetrically arranged obliquely. One end of the gearbox suspension rod 41 is connected to the gearbox mounting seat 13, and the other end is connected to the gearbox 40, thus facilitating the installation of the gearbox 40 on the frame 100. The pair of gearbox mounting seats 13 are arranged obliquely symmetrically, which can keep the forces on both sides of the center of the frame 100 balanced after the gearbox 40 is installed.

[0085] Furthermore, a gearbox anti - detachment hanging seat 14 is provided at the lower surface of the cross - beam seat plate 11 corresponding to the gearbox mounting seat 13. The top surface of the gearbox anti - detachment hanging seat 14 is welded to the lower surface of the cross - beam seat plate 11, and the side surface of the gearbox anti - detachment hanging seat 14 is welded to the first bottom plate 121. The setting of the gearbox anti - detachment hanging seat 14 can ensure that when the gearbox mounting seat 13 fails, the gearbox anti - detachment hanging seat 14 can support the gearbox 40. A gearbox safety support 42 is provided at the end of the gearbox 40. When the gearbox mounting seat 13 fails, the gearbox 40 sags under its own gravity. At this time, the gearbox safety support 42 blocks on the gearbox anti - detachment hanging seat 14, ensuring that the gearbox 40 will not fall onto the track to ensure the safe operation of the train.

[0086] Specifically, the gearbox anti - detachment hanging seat 14 may include a pair of mounting lugs 114 and an anti - detachment shaft fixed between this pair of mounting lugs 114. In the event of an accident, when the gearbox mounting seat 13 fails, the end of the gearbox 40 that detaches, namely the gearbox safety support 42, can fall on the anti - detachment shaft. The anti - detachment shaft holds the falling end of the gearbox 40, which can prevent the falling end of the gearbox 40 from directly falling on the track and affecting the running safety of the train.

[0087] According to an embodiment of the present invention, along the transverse direction of the cross - beam 10, that is, at the transverse two ends of the cross - beam 10, secondary suspension mounting holes 118 are provided on the cross - beam seat plate 11 between a pair of L - shaped side beams 20 for installing secondary steel springs.

[0088] In addition, mounting plates 115 extending towards each other are provided in the hollow structure of the cross - beam seat plate 11. In other words, the cross - beam seat plate 11 is provided with a pair of mounting plates 115, and this pair of mounting plates 115 is located in the hollow structure. The ends of the mounting plates 115 are connected with vertical rib plates 116. The two ends of the vertical rib plates 116 are respectively welded to a pair of first bottom plates 121, that is, welded between a pair of first bottom plates 121, thereby strengthening the connection strength between a pair of cross - beam bottom plates 12 and also improving the structural strength of the entire cross - beam 10.

[0089] In addition, support ribs 117 are provided on the upper surface of the mounting plates 115. The support ribs 117 are welded to the vertical rib plates 116. The support ribs 117 and the mounting plates 115 can be group - welded into a mounting seat, which is convenient for installing components such as lateral dampers on the mounting frame 100.

[0090] In order to improve the structural strength of the L - shaped side beam 20 and the structural stability after welding, according to an embodiment of the present invention, each L - shaped side beam 20 is provided with a pair of transverse vertical plates 23 and a pair of longitudinal vertical plates 24 arranged at intervals. The transverse vertical plates 23 and the longitudinal vertical plates 24 located outside the L - shaped side beam 20 are welded, and the transverse vertical plates 23 and the longitudinal vertical plates 24 located inside the L - shaped side beam 20 are welded.

[0091] In this embodiment, the transverse support plate 211 and the longitudinal support plate 212 are integrally formed to form an L-shaped support plate 21. An extension part is provided on the side of the transverse support plate 211 facing away from the longitudinal support plate 212. The extension part is arc-shaped and serves as a transition connection. The extension part can be welded to the L-shaped support plate 21. One end of the inclined support plate 25 is welded to the end of the extension part, and the other end is welded to the crossbeam seat plate 11. A reinforcing rib 294 is provided between the inclined support plate 25 and the transverse vertical plate 23, thereby making the overall welding of the L-shaped side beam 20 to the crossbeam seat plate 11 more reliable.

[0092] According to an embodiment of the present invention, a motor vertical suspension seat 26 is provided inside the L-shaped side beam 20 for hanging the motor. An anti-drop hanging seat 27 for the motor is also provided inside the L-shaped side beam 20 and is integrally connected to the motor vertical suspension seat 26, which is used to prevent the motor from dropping. It can prevent the motor from falling off when the motor vertical suspension seat 26 fails. The principle is similar to that of the anti-drop hanging seat 14 of the gearbox and will not be elaborated here. In the past, the motor vertical suspension seat 26 of the bogie was installed on the crossbeam 10, that is, the motor was installed on the crossbeam 10. The structure of the L-shaped side beam 20 provided in this embodiment can satisfy the setting of the motor vertical suspension seat 26 on the L-shaped side beam 20, sharing the vertical load of the motor under the operating conditions and abnormal conditions of the bogie and reducing the load burden on the crossbeam 10.

[0093] According to an embodiment of the present invention, a wheel set 30 lifting seat 28 is also provided inside the L-shaped side beam 20. The wheel set 30 lifting seat 28 includes a seat body. The upper end of the seat body is welded to the longitudinal support plate 212 of the L-shaped side beam 20, and the lower end of the seat body is welded to the longitudinal seat plate 22. The upper and lower cover plates of the L-shaped side beam 20 and the seat body are used to form the wheel set 30 lifting seat 28, which has a simple structure, simplifies the welding structure of the frame 100, and reduces the weight of the frame 100.

[0094] The L-shaped side beam 20 of this embodiment is of an L-shaped structure, providing welding positions for the vertical shock absorber, lateral shock absorber, motor, and traction rod, making the structure more compact and reducing the weight of the frame 100.

[0095] According to an embodiment of the present invention, along the longitudinal direction of the crossbeam 10, an L-shaped side beam 20 connection structure for connecting a pair of L-shaped side beams 20 is provided below the crossbeam seat plate 11, that is, the longitudinal plate 112 mentioned above. The pair of L-shaped side beams 20 are connected into a complete L-shaped side beam 20 through the L-shaped side beam 20 connection structure. In other words, the L-shaped side beam 20 of this embodiment is composed of three sections as a whole, namely a pair of L-shaped side beams 20 and the L-shaped side beam 20 connection structure connecting the pair of L-shaped side beams 20.

[0096] Specifically, the L-shaped side beam 20 connection structure includes an arched bottom plate and a plurality of reinforcing ribs 294 connected between the arched bottom plate and the crossbeam seat plate 11. The upper surface of the arched bottom plate faces the lower surface of the crossbeam seat plate 11. The plurality of reinforcing ribs 294 are perpendicularly welded to the upper surface of the arched bottom plate and the lower surface of the crossbeam seat plate 11, and the arched bottom plate is connected to the crossbeam seat plate 11 through the plurality of reinforcing ribs 294.

[0097] Furthermore, the arched bottom plate includes a flat bottom plate 291, first arc-shaped bottom plates 292 located on opposite sides of the flat bottom plate 291, and a second arc-shaped bottom plate 293 located on one side of the first arc-shaped bottom plates 292. The flat bottom plate 291 is sequentially welded to the first arc-shaped bottom plates 292 and the second arc-shaped bottom plate 293, and the thicknesses of the flat bottom plate 291, the first arc-shaped bottom plates 292, and the second arc-shaped bottom plate 293 decrease in sequence, thereby reducing the weight of the frame 100 on the basis of ensuring reliable structural strength.

[0098] Furthermore, the position where the second arc-shaped bottom plate 293 is welded to the lower surface of the crossbeam seat plate 11 corresponds to the position where the longitudinal seat plate 22 is welded to the upper surface of the crossbeam seat plate 11, thereby forming a better transitional connection and forming an overall structure of the frame 100 with a coordinated appearance and good consistency.

[0099] The L-shaped side beam 20 of this embodiment adopts an open structure. When installing the L-shaped side beam 20, four L-shaped side beams 20 can be first welded to the crossbeam support plates 113 of the crossbeam seat plate 11 in pairs facing each other, and then the L-shaped side beam 20 connection structure is welded under the crossbeam seat plate 11 below the adjacent L-shaped side beams 20. The two L-shaped side beams 20 are connected together through the L-shaped side beam 20 connection structure to form a complete L-shaped side beam 20. Thus, the welding method of the previous crossbeam 10 and the L-shaped side beam 20 is changed. By adopting the crossbeam 10 and the L-shaped side beam 20 structures of this embodiment, it is more convenient and efficient to weld into the frame 100. Moreover, the welds are all flat welds between plates, which are convenient for welding and the welding quality is easy to guarantee.

[0100] The present invention also provides a light rail vehicle, including the above-mentioned bogie, which has all the advantages of the above-mentioned bogie and will not be elaborated here. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A powered bogie for a light rail vehicle, characterized in that, Comprising: A frame, including a cross beam with a hollow middle part and in a plate shape, and L-shaped side beams respectively fixed at four corners of the cross beam and arranged in pairs opposite to each other; A wheel set, including an axle and a pair of wheels mounted at both ends of the axle; Axle boxes, mounted at both ends of the axle and located inside a pair of the wheels. A primary spring mounting seat is respectively provided on the top surface of the axle box and the bottom surface of the L-shaped side beam. The axle box and the L-shaped side beam are connected by a primary spring. The upper guide post of the primary spring is fixedly inserted into the primary spring mounting seat of the L-shaped side beam, and the lower guide post of the primary spring is fixedly inserted into the primary spring mounting seat of the axle box; The cross beam includes a cross beam seat plate, the middle part of the cross beam seat plate is a hollow structure, and cross beam support plates extending along the transverse direction of the cross beam are provided at four corners of the cross beam seat plate; The L-shaped side beams correspond to the cross beam support plates one by one, and include L-shaped support plates and longitudinal seat plates. The L-shaped support plates include transverse support plates and longitudinal support plates connected to the transverse support plates. The transverse support plates are arranged opposite to the cross beam support plates and are welded and connected through transverse vertical plates. The longitudinal support plates are arranged opposite to the longitudinal seat plates and are welded and connected through longitudinal vertical plates, and the longitudinal seat plates are welded and connected to the cross beam seat plate; An electric motor vertical hanging seat and an electric motor anti-drop hanging seat integrally connected with the electric motor vertical hanging seat are provided inside the L-shaped side beam. A wheel set lifting seat is also provided inside the L-shaped side beam; Lugs extending along the longitudinal direction of the cross beam are provided on the outer side of the cross beam seat plate relative to the cross beam support plates; The longitudinal seat plate includes a longitudinal flat plate and a longitudinal arc panel that is transitionally connected to the longitudinal flat plate. The end of the longitudinal arc panel is welded to the upper surface of the lug; 2. The motor car bogie of the light rail vehicle according to claim 1, characterized in that A pair of the primary spring mounting seats are symmetrically provided on the top surface of each axle box with respect to the axis of the axle box. A pair of the primary spring mounting seats are correspondingly provided on the bottom surface of the L-shaped side beam. Each axle box is positioned and connected to the L-shaped side beam through a pair of the primary springs; 3. The motor car bogie of the light rail vehicle according to claim 1, characterized in that, It further includes a gear box and a driving motor. The gear box is provided with an input shaft and a mounting hole arranged side by side. The driving shaft of the driving motor is connected to the input shaft of the gear box through a coupling, and multiple elastic nodes are provided between the relative ends of the driving motor and the gear box. The gear box is mounted on the axle through the mounting hole, and the axle is a hollow axle; Motor longitudinal tie rods and vertically arranged motor mounting nodes are spaced at one end of the driving motor away from the driving shaft. The driving motor is connected to the frame through the motor longitudinal tie rods and the motor mounting nodes; Vertically arranged gear box suspension rods and horizontally arranged gear box safety supports are provided on the side wall of the gear box. The gear box is connected to the frame through the gear box suspension rods and is stopped at the frame through the gear box safety supports.

4. The powered bogie of the light rail vehicle according to claim 3, characterized in that At the end of the drive motor facing the gearbox, at least one first mounting ear protruding outwardly in the circumferential direction is provided. At the corresponding end of the gearbox, a plurality of second mounting ears protruding outwardly in the circumferential direction are provided. The at least one first mounting ear and the plurality of second mounting ears are arranged staggeredly in the circumferential direction, and an elastic node is installed in each of the at least one first mounting ear and each of the second mounting ears.

5. The powered bogie of the light rail vehicle according to claim 3, characterized in that, On the side of the gearbox facing away from the drive motor, a brake disc and a matching brake caliper are provided. The brake disc is installed on the input shaft of the gearbox, and the brake caliper is installed on the housing of the gearbox and faces the brake disc. The brake caliper is adapted to tightly hold the brake disc during braking.

6. The motor car bogie of the light rail vehicle according to claim 5, characterized in that It further includes: A magnetic track braking device, which is installed on the outer side of the L-shaped side beam through a hanging structure, and the magnetic track braking device is arranged longitudinally along the frame; A mechanical manual release device, which is arranged transversely along the frame. It includes a connecting rod and a pair of manual release levers connected to both ends of the connecting rod. A release pull rod is respectively connected at the connection between the connecting rod and the manual release lever, and the lower end of the release pull rod is connected to the brake caliper on the frame; A bolster assembly, which is installed on the cross beam through a pair of secondary steel springs.

7. The powered bogie of the light rail vehicle according to any one of claims 1-6, characterized in that The cross beam further includes a pair of cross beam bottom plates. Along the longitudinal direction of the cross beam, the pair of cross beam bottom plates are vertically welded to the opposite sides of the lower surface of the cross beam seat plate and extend along the transverse direction of the cross beam; The cross beam bottom plate includes a first bottom plate, second bottom plates located on both sides of the first bottom plate, and a third bottom plate located on one side of the second bottom plate. The first bottom plate, the second bottom plates, and the third bottom plate are welded in sequence, and the thicknesses of the first bottom plate, the second bottom plates, and the third bottom plate decrease in sequence; At least one wire passing hole is provided on the first bottom plate, and the wire passing holes on the pair of first bottom plates correspond to each other one by one; On the upper surface of the cross beam seat plate, a pair of gearbox mounting seats are symmetrically provided obliquely. At the position corresponding to the gearbox mounting seat on the lower surface of the cross beam seat plate, a gearbox anti-drop hanging seat is provided. The top surface of the gearbox anti-drop hanging seat is welded to the lower surface of the cross beam seat plate, and the side surface of the gearbox anti-drop hanging seat is welded to the first bottom plate; Along the transverse direction of the cross beam, second suspension mounting holes are provided on the cross beam seat plate between the pair of L-shaped side beams. The cross beam seat plate is located in the hollow structure and is provided with mounting plates extending towards each other. The end of the mounting plate is connected with a vertical rib plate, and both ends of the vertical rib plate are respectively welded to the pair of first bottom plates. The upper surface of the mounting plate is provided with support ribs, and the support ribs are welded to the vertical rib plate.

8. The motor car bogie of the light rail vehicle according to any one of claims 1-6, characterized in that, Each L-shaped side beam is provided with a pair of the transverse vertical plates and a pair of the longitudinal vertical plates arranged at intervals; The transverse support plate and the longitudinal support plate are integrally formed. On the side of the transverse support plate facing away from the longitudinal support plate, an extension part is provided. The extension part is welded to the cross beam seat plate through an inclined support plate, and a reinforcing rib is provided between the inclined support plate and the transverse vertical plate.

9. The powered bogie of the light rail vehicle according to any one of claims 1-6, characterized in that, Longitudinally along the crossbeam, an L-shaped side beam connection structure for connecting a pair of the L-shaped side beams is provided below the crossbeam seat plate, and the L-shaped side beam connection structure includes an arched bottom plate and a plurality of reinforcing ribs connected between the arched bottom plate and the crossbeam seat plate; The arched bottom plate includes a flat bottom plate, first arc-shaped bottom plates located on opposite sides of the flat bottom plate, and a second arc-shaped bottom plate located on one side of the first arc-shaped bottom plates. The flat bottom plate is welded to the first arc-shaped bottom plates and the second arc-shaped bottom plate in sequence, and the thicknesses of the flat bottom plate, the first arc-shaped bottom plates, and the second arc-shaped bottom plate decrease in sequence; The position where the second arc-shaped bottom plate is welded to the lower surface of the crossbeam seat plate corresponds to the position where the longitudinal seat plate is welded to the upper surface of the crossbeam seat plate.

10. A light rail vehicle, characterized in that, It includes the motor car bogie of the light rail vehicle according to any one of claims 1-9.

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