An installation structure of a low-floor tram wheel box cover plate

Abstract

An installation structure for a low-floor tram wheel box cover plate according to an embodiment of the present application includes a vehicle body wheel box cover. A skeleton assembly is installed on the top of the vehicle body wheel box cover, and the skeleton assembly is connected to the side wall of the vehicle body. An integrally formed cover plate assembly is sleeved outside the skeleton assembly. The left and right sides of the cover plate assembly are open-notch structures. The left and right side plates of the cover plate assembly are vertically inserted into the left and right side walls of the vehicle body wheel box cover through an insertion structure. The top parts of the left and right side plates are respectively connected to the vehicle body wheel box cover and the skeleton assembly, and the top plate of the cover plate assembly is connected to the top of the skeleton assembly. In the present application, the installation structure of the wheel box cover plate is divided into two parts, an internal skeleton assembly and an external cover plate assembly. The skeleton assembly is used to complete installation and provide strength support, and the cover plate assembly is used to achieve isolation of the human-machine interface, solving the problem that it is difficult to have both installation convenience and aesthetics. The structure is simple, the cost is low, and the economic benefit is good, and it is applicable to the technical field of rail vehicle manufacturing.

Description

Technical Field

[0001] This application relates to the technical field of rail vehicle manufacturing, and particularly to an installation structure of a low-floor tram wheel box cover plate. Background Art

[0002] The floor of a low-floor tram is only 35 cm from the rail surface. It does not require a platform, has a large passenger capacity, can lay tracks on the existing urban roads, has a low cost, is energy-saving and environment-friendly, and has low noise. It is one of the most advanced urban transportation systems in the world today. In recent years, as a new type of modern urban transportation equipment, low-floor trams have developed rapidly and have been widely promoted in emerging cities, branch lines of large cities, and small and medium-sized cities in China.

[0003] Compared with subway vehicles, in order to reduce the floor height of low-floor vehicles, the bogie will enter the interior of the car body. The car body is provided with a wheel box cover to isolate the bogie from the interior of the passenger compartment. From the passenger compartment, the wheel box cover protrudes from the passenger compartment floor surface. Therefore, when making the interior design, a separate wheel box cover plate needs to be designed to cover the wheel box of the car body and provide an installation bracket for the seat. At the same time, because sand spreading devices, wheel flange lubrication devices, etc. need to be installed on the upper part of the car body wheel box and inside the interior wheel box cover plate, the structure is relatively complex, the operating space is very limited, and the installation accuracy requirement is relatively high. Therefore, the design of the wheel box cover plate has always been a major difficulty. Summary of the Invention

[0004] In order to solve one of the above technical defects, an installation structure of a low-floor tram wheel box cover plate is provided in an embodiment of the present application.

[0005] According to the first aspect of the embodiment of the present application, an installation structure of an interior wheel box cover plate of a low-floor tram is provided, which includes a car body wheel box protruding from the car body floor surface. The top of the car body wheel box is in a high-step and low-step shape. A skeleton assembly is installed on the top of the car body wheel box. The skeleton assembly includes support frames arranged on the low step and the high step and a connecting frame arranged on the high step. The connecting frame is connected to one side of the support frame, and the connecting frame is connected to the car body side wall. An integrally formed cover plate assembly is sleeved outside the car body wheel box and the skeleton assembly. The cover plate assembly includes a left side plate, a right side plate, a front side plate, a rear side plate, and a top plate. The left side plate and the right side plate are respectively arranged on one side of the low step and the high step, and the left side plate and the right side plate respectively cover the side surfaces of the low step and the high step. The front side plate is arranged on the side away from the car body side wall, and the front side plate correspondingly covers the surfaces of the low step, the support frame, and the high step on the side away from the car body side wall. The top plate covers the top of the support frame. The rear side plate is arranged on one side of the car body side wall, and the rear side plate is connected to the rear end of the support frame.

[0006] Furthermore, plugging structures are provided on the inner sides of the bottoms of the left side plate and the right side plate. The plugging structure includes a first aluminum profile plugging piece. The bottom of the first aluminum profile plugging piece is riveted to the side surface of the bottom of the vehicle body wheel box cover through a first rivet. Second aluminum profile plugging pieces are provided on the inner sides of the bottoms of the left side plate and the right side plate corresponding to the first aluminum profile plugging piece. A chute is formed between the top of the first aluminum profile plugging piece and the side surface of the bottom of the vehicle body wheel box cover. The left side plate and the right side plate are vertically inserted into the chute through the second aluminum profile plugging pieces.

[0007] Furthermore, a plurality of first connecting pieces horizontally extend respectively on the top of the left side plate and on the front side plate corresponding to the top of the low step. The first connecting pieces are connected with a carbon steel reinforcing plate through countersunk head screws. Both ends of the carbon steel reinforcing plate are respectively riveted to the top of the low step through second rivets.

[0008] Furthermore, a plurality of flexible support structures are provided on the inner side of the bottom of the front side plate. The flexible support structure includes an installation fixing seat. A flexible adjustment pad is plugged on the installation fixing seat. A plurality of rows of through holes are provided inside the flexible adjustment pad. The serrated surface of the flexible adjustment pad is closely attached to the surface of the vehicle body wheel box cover.

[0009] Furthermore, seat interfaces are provided on the top of the connecting frame and on the top of the high step. Seats are installed on the seat interfaces. The edge contours where the left side plate, the front side plate, and the top plate are connected and the edge contours where the right side plate, the front side plate, and the top plate are connected respectively match the contours of the seats installed at these places.

[0010] Furthermore, a plurality of second connecting pieces horizontally extend respectively on the top of the right side plate and on the front side plate corresponding to the top of the high step. The second connecting pieces are bolted to the interfaces provided on the top of the connecting frame.

[0011] Furthermore, third connecting pieces are respectively provided on the inner side of the front side plate, on the inner side of the top plate, and on the inner side of the bottom of the rear side plate. The third connecting pieces are bolted to the interfaces provided on the support frame.

[0012] Furthermore, both sides of the bottom of the support frame are respectively bolted to the top of the high step and the low step through fourth connecting pieces. The bottom of the connecting frame is bolted to the top of the high step through a plurality of fourth connecting pieces.

[0013] Adopt the installation structure of the interior wheel box cover plate of the low-floor tram provided in the embodiment of the present application. Split the interior wheel box cover plate into two parts: the internal skeleton component and the external cover plate component. Use the skeleton component to complete the installation and strength support respectively, and the cover plate component to achieve the isolation of the human-machine interface; the cover plate component in this application is an integral structure, and there is no assembly gap after installation, with good aesthetics; and the top of the cover plate component is open on the left and right, greatly increasing the installation space; for the narrow installation space at the bottom of the cover plate component, this application adopts a combination of a plug-in structure and a flexible support structure. The plug-in structure realizes the convenient installation of the cover plate component, and the flexible support structure can ensure the strength of the cover plate component and also realize the gap adjustment between the cover plate component and the side wall of the car body. Description of the Drawings

[0014] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0015] Figure 1 It is an assembly drawing of the installation structure of the interior wheel box cover plate of the low-floor tram provided in the embodiment of the present application;

[0016] Figure 2 It is a schematic structural diagram of the car body wheel box cover provided in the embodiment of the present application;

[0017] Figure 3 It is a schematic structural diagram of the skeleton component provided in the embodiment of the present application;

[0018] Figure 4 It is a schematic external structural diagram of the cover plate component provided in the embodiment of the present application;

[0019] Figure 5 It is a schematic internal structural diagram of the cover plate component provided in the embodiment of the present application;

[0020] Figure 6 It is a schematic connection structure diagram of the plug-in structure provided in the embodiment of the present application;

[0021] Figure 7 It is a schematic connection structure diagram of the first connecting piece provided in the embodiment of the present application;

[0022] Figure 8 It is a schematic diagram of the flexible support structure provided in the embodiment of the present application;

[0023] Figure 9 It is a schematic installation diagram of the seat provided in the embodiment of the present application;

[0024] In the figure, 10 is the body wheel box cover, 101 is the high step, 102 is the low step, 20 is the skeleton assembly, 201 is the support frame, 202 is the connecting frame, 203 is the fourth connecting piece, 204 is the fifth connecting piece, 30 is the cover plate assembly, 301 is the left side plate, 302 is the right side plate, 303 is the front side plate, 304 is the rear side plate, 305 is the top plate, 306 is the second connecting piece, 307 is the third connecting piece, 40 is the plugging structure, 401 is the first aluminum profile plugging piece, 402 is the first rivet, 403 is the second aluminum profile plugging piece, 50 is the first connecting piece, 501 is the countersunk head screw, 502 is the carbon steel reinforcement plate, 503 is the second rivet, 60 is the flexible support structure, 601 is the mounting and fixing seat, 602 is the flexible adjusting pad, 70 is the seat, and 80 is the pedal. Detailed implementation manners

[0025] In order to make the technical solutions and advantages in the embodiments of the present application clearer and more understandable, the following further elaborates on the exemplary embodiments of the present application in conjunction with the appended Figures 1-9 The exemplary embodiments of the present application are further described in detail. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0026] In the process of implementing the present application, the inventor found that the design of the wheel box cover plate on low-floor vehicles has always been a difficult point. The currently applied structures are as follows:

[0027] Structure 1: A stainless-steel kickboard is provided at the lower part of the interior wheel box cover plate. The structure between the kickboard and the wheel box cover plate is designed to be detachable (connected by a nylon fastener). When installing the cover plate, the kickboard can be disassembled first, and the lower part of the cover plate is connected to the vehicle body by screws. After the connection is completed, the kickboard can be reinstalled.

[0028] Structure 2: The interior wheel box cover plate is a three-sided structure, which is split into three parts and installed independently. The installation is convenient, and adjustment can be made at any time, with simple operation.

[0029] Structure 3: The passenger compartment floor cloth is turned up to the vehicle body wheel box cover. When installing, the wheel box cover plate is fixed first, and then the floor cloth is laid after completion. After the floor cloth is turned up, it can cover the installation screws of the wheel box cover plate.

[0030] The disadvantages of the above existing structures during installation are as follows:

[0031] For Structure 1, the connection between the kickboard and the wheel box cover is bonded by a nylon fastener, with a large gap between them. The installation effect on the existing vehicle is not ideal, and the aesthetics is poor. At the same time, the bonding with the nylon fastener is not very reliable. The kickboard is vulnerable to the impact of human feet and is extremely easy to fall off.

[0032] There will be gaps between the two structural blocks. The number of gaps is large and they are obviously exposed, resulting in poor aesthetics.

[0033] The aesthetics of Structure Three is poor. Since the floor cloth is turned up onto the wheel box cover, it is impossible to take sound insulation and noise reduction measures. The noise of the bogie is very easy to be transmitted into the passenger compartment, resulting in a large amount of noise and a poor riding experience for passengers. And if it is necessary to remove the cover plate of the wheel box cover, the floor cloth must be damaged, and the repair and paving of the floor cloth are difficult.

[0034] In view of the above problems, in the embodiments of the present application, an installation structure of an interior wheel box cover plate for a low-floor tram is provided. As Figures 1-4 shown, it includes a vehicle body wheel box cover 10 protruding from the vehicle body floor surface. The top of the vehicle body wheel box cover 10 is in the shape of a high step 101 and a low step 102. A skeleton assembly 20 is installed on the top of the vehicle body wheel box cover 10. The skeleton assembly 20 includes a support frame 201 arranged on the low step 102 and the high step 101, and a connecting frame 202 arranged on the high step 101. The connecting frame 202 is connected to one side of the support frame 201. The connecting frame 202 is connected to the vehicle body side wall through a fifth connecting piece 204. An integrally formed cover plate assembly 30 is sleeved outside the vehicle body wheel box cover 10 and the skeleton assembly 20. The cover plate assembly 30 includes a left side plate 301, a right side plate 302, a front side plate 303, a rear side plate 304 and a top plate 305. The left side plate 301 and the right side plate 302 are respectively arranged on one side of the low step 102 and the high step 101. The height of the left side plate 301 is adapted to the height of the low step 102, and the height of the right side plate 302 is adapted to the height of the high step 101 plus the connecting frame 202. And the left side plate 301 and the right side plate 302 respectively cover the side surfaces of the low step 102 and the high step 101. The front side plate 303 is arranged on the side far from the vehicle body side wall, and the front side plate 303 correspondingly covers the surfaces of the low step 102, the support frame 201 and the high step 101 on the side far from the vehicle body side wall. The top plate 305 covers the top of the support frame 201. The rear side plate 304 is arranged on the side of the vehicle body side wall, and the rear side plate 304 is connected to the rear end of the support frame 201.

[0035] Specifically, during installation, first install the skeleton assembly 20 on the top of the vehicle body wheel box cover 10 to provide an installation interface and support for the cover plate assembly 30, and then install the cover plate assembly 30 to cover the skeleton assembly 20 and the vehicle body wheel box cover 10 inside it, realizing isolation from the passenger interface. The installation structure of the interior wheel box cover plate is split into an internal skeleton assembly 20 and an external cover plate assembly 30. By this method, the structure and function of the interior wheel box cover plate are decoupled. The installation is simple, time-saving and labor-saving. The cover plate assembly 30 is an integral structure, and there are no assembly gaps after installation, with good aesthetics.

[0036] Furthermore, there are two relatively established body wheel box covers 10 inside the vehicle body. An inner wheel box cover plate installation structure is installed on each body wheel box cover 10, and a pedal 80 is provided on the vehicle body floor surface between the two body wheel box covers 10.

[0037] As a preferred solution, as Figure 6 shown, plug-in structures 40 are provided on the inner sides of the bottoms of the left side plate 301 and the right side plate 302. The plug-in structure 40 includes a first aluminum profile plug-in part 401. The bottom of the first aluminum profile plug-in part 401 is riveted to the bottom side of the body wheel box cover 10 through a first rivet 402. Second aluminum profile plug-in parts 403 are provided on the inner sides of the bottoms of the left side plate 301 and the right side plate 302 corresponding to the first aluminum profile plug-in part 401. A chute is formed between the top of the first aluminum profile plug-in part 401 and the bottom side of the body wheel box cover 10. The left side plate 301 and the right side plate 302 are vertically inserted into the chute through the second aluminum profile plug-in parts 403.

[0038] Since the installation space between the bottom of the body wheel box cover 10 and the bottom of the cover assembly 30 is narrow, the plug-in structure 40 is used to realize the connection between the two. At the same time, when installing the plug-in structure 40, only the left side plate 301 and the right side plate 302 need to be vertically inserted into the corresponding chute, and the installation is more convenient and time-saving and labor-saving.

[0039] As a preferred solution, as Figure 7 shown, Figure 7 the left side in [figure number] is a partial enlarged view of the first connecting piece, Figure 7 the right side in [figure number] is a cross-sectional view of the first connecting piece. A plurality of first connecting pieces 50 horizontally extend from the top of the left side plate 301 and the top of the front side plate 303 corresponding to the top of the low step 102 respectively. The first connecting piece 50 is connected with a carbon steel reinforcing plate 502 through a countersunk head screw 501. Both ends of the carbon steel reinforcing plate 502 are riveted to the top of the low step 102 through second rivets 503.

[0040] Specifically, the installation sequence of the first connecting piece 50 is: first, rivet the carbon steel reinforcing plate 502 to the top of the low step 102 through the second rivet 503, and then bolt-connect the first connecting piece 50 and the carbon steel reinforcing plate 502 through the countersunk head screw 501.

[0041] Part of the connection of the cover assembly 30 (i.e., the top of the left side plate 301 and the top of the front side plate 303 corresponding to the top of the low step 102) is completed through the first connecting piece 50.

[0042] As a preferred solution, as Figure 5 、 Figure 8As shown, since the distance between the front side plate 303 and the vehicle body wheel box cover 10 is small, and to ensure that the cover assembly 30 can be adjusted in the vehicle width direction, a plurality of flexible support structures 60 are provided on the inner side of the bottom of the front side plate 303. The flexible support structure 60 includes a mounting and fixing seat 601, which is a structure welded by aluminum plates and can be fixed inside the cover assembly 30 by bonding. A flexible adjustment pad 602 is inserted into the mounting and fixing seat 601. The flexible adjustment pad 602 can be a rubber part. A plurality of rows of through holes are provided inside the flexible adjustment pad 602, and the serrated surface of the flexible adjustment pad 602 is closely attached to the surface of the vehicle body wheel box cover 10.

[0043] Specifically, two rows of through holes are added at the cross-section position of the flexible adjustment pad 602 to enhance its deformation ability and reduce its weight. It can be designed with different thicknesses and selected according to the actual situation during installation. During installation, it can be inserted into the mounting and fixing seat 601; the flexible support structure 60 realizes the support for the cover assembly 30 in a limited space, ensuring the strength of the cover assembly 30; at the same time, since the flexible adjustment pad 602 has elasticity, the cover assembly 30 can be adjusted in the vehicle width direction. The flexible adjustment pad 602 deforms under pressure, thereby narrowing or widening the gap between the cover assembly 30 and the vehicle body side wall or the vehicle body wheel box cover 10.

[0044] As a preferred solution, as Figure 9 shown, seat interfaces are provided at the top of the connecting frame 202 and the top of the high step 101, and a seat 70 is installed on the seat interface. The edge contours where the left side plate 301, the front side plate 303, and the top plate 305 are connected and the edge contours where the right side plate 302, the front side plate 303, and the top plate 305 are connected respectively match the contour of the seat 70 installed at this place.

[0045] After the installation of the skeleton assembly 20 and the cover assembly 30 is completed, the seat 70 can be installed. The seat 70 fills the open gaps on the left and right sides of the cover assembly 30, further realizing its aesthetics.

[0046] As a preferred solution, as Figure 1 、 Figure 4 shown, a plurality of second connectors 306 horizontally extend respectively at the top of the right side plate 302 and on the front side plate 303 corresponding to the top of the high step 101, and the second connectors 306 are bolt-connected to the interfaces provided at the top of the connecting frame 202.

[0047] The connection of the cover assembly 30 is further completed through the second connectors 306.

[0048] As a preferred solution, as Figure 1 、 Figure 4 、 Figure 5As shown in the figure, third connectors 307 are respectively provided on the inner side of the front side plate 303, the inner side of the top plate 305, and the inner side of the bottom of the rear side plate 304. The third connectors 307 are bolted to the interfaces provided on the support frame 201.

[0049] The connection between the cover assembly 30 and the support frame 201 is completed through the third connectors 307.

[0050] As a preferred solution, as Figure 3 shown in the figure, both sides of the bottom of the support frame 201 are respectively set corresponding to the heights of the high step 101 and the low step 102. Both sides of the bottom of the support frame 201 are respectively bolted to the tops of the high step 101 and the low step 102 through the fourth connectors 203. The bottom of the connection frame 202 is bolted to the top of the high step 101 through a plurality of fourth connectors 203.

[0051] The connection between the skeleton assembly 20 and the top of the vehicle body wheel box cover 10 is completed through the fourth connectors 203.

[0052] During specific installation, after aligning each connector with the corresponding interface position, the skeleton assembly 20 is installed on the top of the vehicle body wheel box cover 10. The support frame 201 straddles the high step 101 and the low step 102, and the connection is completed through the fourth connectors 203. The connection frame 202 is connected to the top of the high step 101 through a plurality of fourth connectors 203. The side of the connection frame 202 close to the vehicle body side wall is connected to the vehicle body side wall through the fifth connector 204. Thus, the installation of the skeleton assembly 20 is completed; Next, the installation of the cover assembly 30 is carried out. The flexible support structure 60 is installed on the inner side of the bottom of the front side plate 303. The first aluminum profile insert 401 is respectively installed on the left and right sides of the bottom of the vehicle body wheel box cover 10 through the first rivets 402. At the same time, the carbon steel reinforcement plate 502 is riveted to the top of the low step 102 through the second rivets 503. After the preparation work is completed, the left side plate 301 and the right side plate 302 are vertically inserted into the corresponding chutes. The cover assembly 30 is adjusted in the vehicle width direction until the connectors on the cover assembly 30 are aligned with the corresponding interface positions. In the direction of the left side plate, the first connector 50 is bolted to the carbon steel reinforcement plate 502 through the countersunk head screws 501. In the direction of the right side plate, the second connector 306 is bolted to the top of the connection frame 202 through bolts. The operator enters the inside of the wheel box cover structure through the open notch structures on both sides of the cover assembly 30 and bolts the third connector 307 to the support frame. Thus, the installation of the cover assembly 30 is completed; Then, seats 70 are respectively installed on the top of the connection frame 202 and the top of the high step 101.

[0053] A low-floor tram wheel box cover plate installation structure provided by this embodiment divides the wheel box cover plate installation structure into two parts: an internal skeleton component and an external cover plate component. The skeleton component is used to complete installation and provide strength support, and the cover plate component is used to achieve the isolation of the human-machine interface. The cover plate component is an integral structure, and there are no assembly gaps after installation, which has good aesthetics; moreover, the top of the cover plate component is open on the left and right, greatly increasing the installation space; for the narrow installation space at the bottom of the cover plate component, this application adopts a combination of a plug-in structure and a flexible support structure. The plug-in structure realizes the convenient installation of the cover plate component, and the flexible support structure can adjust the gap between the cover plate component and the car body side wall while ensuring the strength of the cover plate component. The structure of this embodiment is simple, and the materials used are all conventional materials, which will not increase costs and has good economic benefits and strong practicability.

[0054] In the description of this application, it should be understood that the orientation or positional relationships indicated by terms such as "center", "height", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0055] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] In this application, unless otherwise clearly specified and limited, terms such as "installation", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] Although the preferred embodiments of this application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of this application.

[0058] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these changes and modifications.

Claims

1. An installation structure of an interior wheel box cover plate for a low-floor tram, characterized in that, it includes a vehicle body wheel box cover (10) protruding from the vehicle body floor surface. The top of the vehicle body wheel box cover (10) is in the shape of a high step (101) and a low step (102). A skeleton assembly (20) is installed on the top of the vehicle body wheel box cover (10). The skeleton assembly (20) includes a support frame (201) arranged on the low step (102) and the high step (101), and a connecting frame (202) arranged on the high step (101). The connecting frame (202) is connected to one side of the support frame (201), and the connecting frame (202) is connected to the vehicle body side wall. An integrally formed cover plate assembly (30) is sleeved outside the vehicle body wheel box cover (10) and the skeleton assembly (20). The cover plate assembly (30) includes a left side plate (301), a right side plate (302), a front side plate (303), a rear side plate (304), and a top plate (305); The inner sides of the bottoms of the left side plate (301) and the right side plate (302) are both provided with a plugging structure (40). The plugging structure (40) includes a first aluminum profile plugging part (401). The bottom of the first aluminum profile plugging part (401) is riveted to the side surface of the bottom of the vehicle body wheel box cover (10) through a first rivet (402). The left side plate (301) and the right side plate (302) are respectively provided with a second aluminum profile plugging part (403) corresponding to the first aluminum profile plugging part (401) on the inner sides of their bottoms. A chute is formed between the top of the first aluminum profile plugging part (401) and the side surface of the bottom of the vehicle body wheel box cover (10). The left side plate (301) and the right side plate (302) are vertically inserted into the chute through the second aluminum profile plugging part (403).

2. The installation structure of an interior wheel box cover plate for a low-floor tram according to claim 1, wherein the left side plate (301) and the right side plate (302) are respectively arranged on one side of the low step (102) and the high step (101), and the left side plate (301) and the right side plate (302) respectively cover the side surfaces of the low step (102) and the high step (101). The front side plate (303) is arranged on the side far from the vehicle body side wall, and the front side plate (303) correspondingly covers the surfaces on the side far from the vehicle body side wall of the low step (102), the support frame (201), and the high step (101). The top plate (305) covers the top of the support frame (201). The rear side plate (304) is arranged on the side of the vehicle body side wall, and the rear side plate (304) is connected to the rear end of the support frame (201).

3. The installation structure of an interior wheel box cover plate for a low-floor tram according to claim 1, characterized in that, At the top of the left side plate (301) and corresponding to the top of the low step (102) on the front side plate (303), a plurality of first connecting members (50) extend horizontally respectively. The first connecting members (50) are connected with a carbon steel reinforcement plate (502) by countersunk head screws (501). Both ends of the carbon steel reinforcement plate (502) are riveted to the top of the low step (102) by second rivets (503).

4. The installation structure of the interior wheel box cover plate of a low-floor tram according to claim 1, characterized in that, A plurality of flexible support structures (60) are provided inside the bottom of the front side plate (303). The flexible support structure (60) includes an installation fixing seat (601). A flexible adjustment pad (602) is inserted on the installation fixing seat (601). A plurality of rows of through holes are provided inside the flexible adjustment pad (602). The serrated surface of the flexible adjustment pad (602) is closely attached to the surface of the vehicle body wheel box cover (10).

5. The installation structure of the interior wheel box cover plate of a low-floor tram according to claim 1, characterized in that, Seat interfaces are provided at the top of the connecting frame (202) and the top of the high step (101). A seat (70) is installed on the seat interface. The edge contours where the left side plate (301), the front side plate (303), and the top plate (305) are joined and the edge contours where the right side plate (302), the front side plate (303), and the top plate (305) are joined are respectively adapted to the contour of the seat (70) installed at that place.

6. The installation structure of the interior wheel box cover plate of a low-floor tram according to claim 1, characterized in that, At the top of the right side plate (302) and corresponding to the top of the high step (101) on the front side plate (303), a plurality of second connecting members (306) extend horizontally respectively. The second connecting members (306) are bolt-connected to the interfaces provided at the top of the connecting frame (202).

7. The installation structure of the interior wheel box cover plate of a low-floor tram according to claim 1, characterized in that, Third connecting members (307) are respectively provided inside the front side plate (303), inside the top plate (305), and inside the bottom of the rear side plate (304). The third connecting members (307) are bolt-connected to the interfaces provided on the support frame (201).

8. The installation structure of the interior wheel box cover plate of a low-floor tram according to claim 1, characterized in that, Both sides of the bottom of the support frame (201) are bolt-connected to the tops of the high step (101) and the low step (102) by fourth connecting members (203). The bottom of the connecting frame (202) is bolt-connected to the top of the high step (101) by a plurality of fourth connecting members (203).

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