Vehicle floor, floor assembly, trailer floor, and vehicle

Abstract

Provided are a vehicle floor, a floor assembly, a trailer floor, and a vehicle. A floor body (91) of the vehicle floor (9) is an integrally formed structure, and a side of the floor body is provided with at least one frame longitudinal beam (93), so that the vehicle floor structure can be simplified and the weight of the vehicle body can be reduced.

Description

Vehicle floor, floor assembly, trailer floor and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 30, 2023, with application number 202310805914.4, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to, but are not limited to, the technical field of vehicle chassis or frames, and specifically relate to, but are not limited to, a vehicle floor, a floor assembly, a trailer floor, and a vehicle. Background Art

[0004] The vehicle floor is mostly made of a steel structure frame and steel plates welded together. The frame is connected by two frame longitudinal beams and multiple cross beams through bolts to achieve the transportation of goods of special volume and weight.

[0005] Summary of the Invention

[0006] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0007] A first aspect of the present disclosure provides a vehicle floor panel, which is an integrally formed structure; the vehicle floor panel includes a floor panel body, and at least one frame longitudinal beam is provided on one side of the floor panel body.

[0008] In some embodiments, the number of the frame rails is 2.

[0009] In some embodiments, the frame rails enclose at least one first cavity.

[0010] In some embodiments, at least one third cavity is provided in the profile forming the frame longitudinal rail.

[0011] In some embodiments, the base plate body is a solid structure;

[0012] Alternatively, at least one second cavity is provided in the base plate body.

[0013] According to a second aspect of the present disclosure, a floor assembly is provided, comprising a load-bearing portion and a gooseneck portion that are fixedly connected, wherein the load-bearing portion is formed by any vehicle floor as described in the first aspect.

[0014] In some embodiments, the gooseneck is a one-piece molded structure or a steel structure.

[0015] In some embodiments, one end of the vehicle floor is bent to form the gooseneck shape.

[0016] In some embodiments, a height difference is provided between the top surface of the gooseneck and the bearing surface of the bearing portion in the thickness direction of the vehicle floor.

[0017] In some embodiments, the supporting portion and the gooseneck portion are made of the same material.

[0018] In some embodiments, the vehicle floor is made of aluminum alloy.

[0019] According to a third aspect of the present disclosure, a trailer floor is provided, comprising a load-bearing portion, a frame longitudinal beam, and a receiving structure; the receiving structure is arranged at the bottom of the load-bearing portion, and the receiving structure forms a receiving cavity; wherein the load-bearing portion is composed of any vehicle floor as described in the first aspect.

[0020] According to a fourth aspect of the present disclosure, there is provided a vehicle, comprising:

[0021] wheel assembly;

[0022] The vehicle floor panel according to the first aspect;

[0023] or, the base plate assembly as described in the second aspect;

[0024] or, any trailer bed as described in the third aspect;

[0025] The wheel assembly is provided at the bottom of the vehicle floor.

[0026] The technical solution provided by the present disclosure can achieve at least the following beneficial effects:

[0027] The vehicle floor panel of the disclosed vehicle floor panel utilizes a profiled, one-piece extrusion structure, eliminating the need for extensive subsequent assembly processes. This simplifies the vehicle floor panel structure and shortens the production cycle. Furthermore, based on this one-piece extrusion structure, at least one frame rail is provided on one side of the floor panel body. This rail ensures the floor panel's operational strength and eliminates the need for additional crossbeams. This further simplifies the vehicle floor panel structure and reduces vehicle weight. The floor panel assembly and vehicle utilizing this vehicle floor panel not only achieve weight reduction, structural simplification, and a shortened production cycle, but also improves cargo carrying capacity due to the reduced weight of the vehicle floor panel.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic cross-sectional view of a vehicle floor panel according to an exemplary embodiment of the present disclosure.

[0030] FIG2 is a schematic structural diagram of a floor assembly in an exemplary embodiment of the present disclosure.

[0031] FIG3 is a schematic cross-sectional view of a trailer floor according to an exemplary embodiment of the present disclosure.

[0032] Figure markings: 6-trailer floor, 61-load-bearing portion, 611-opening, 62-frame longitudinal beam, 63-receiving structure, 631-accommodating cavity, 7-floor assembly, 71-load-bearing portion, 72-gooseneck, 721-top surface, 81-wheel assembly, 9-vehicle floor, 91-floor body, 911-load-bearing surface, 912-bottom surface, 92-second cavity, 93-frame longitudinal beam, 931-first cavity, 932-third cavity. DETAILED DESCRIPTION

[0033] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present disclosure.

[0034] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meanings understood by a person of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. If only "a" is referred to, this will be separately stated. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper," "top," and "bottom" are used for ease of description only and are not limited to a single position or spatial orientation. Terms such as "include" or "comprising" mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. The words “connected” or “connected” and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0035] In related technologies, vehicle floors are often constructed from welded steel frames and steel plates to accommodate cargo of unusual size and weight. However, these structures and materials hinder their load-bearing capacity due to their bulk, weight, and overall lack of strength. Therefore, reducing the floor's weight while shortening production, processing, and manufacturing cycles has become a hot topic in this field.

[0036] The present disclosure provides a vehicle floor. FIG1 is a schematic diagram of the cross-sectional structure of a vehicle floor in an exemplary embodiment of the present disclosure. As shown in FIG1 , the vehicle floor 9 is an integrally formed structure, such as a profile-type extruded integrally formed structure. The vehicle floor 9 includes a floor body 91, and at least one frame longitudinal beam 93 is provided on one side of the floor body 91. Among them, the profile-type integrally formed extruded structure is a special extrusion-formed structure, in which the profile is very long and its cross-section is a whole. The "profile-type integrally formed extruded structure" here is a profile-type structure prepared using a similar profile-type integrally formed extrusion process.

[0037] It should be noted that the floor panel body 91 may include a load-bearing surface 911 and a bottom surface 912 opposite the load-bearing surface. The bottom surface 912 opposite the load-bearing surface 911 may be located on one side of the floor panel body 91. Positioning the frame rails 93 on the bottom surface prevents structural and spatial interference with the vehicle's cargo support, thereby enhancing the aesthetics and load-bearing capacity of the vehicle floor panel 9. Furthermore, the vehicle floor panel 9 extends in mutually perpendicular transverse and longitudinal directions. The longitudinal direction may refer to the length of the vehicle from the front to the rear, and the transverse direction may refer to the width of the vehicle perpendicular to the longitudinal direction.

[0038] The vehicle floor panel 9 comprises a profiled, integrally extruded structure, which eliminates the need for extensive subsequent assembly processes. This simplifies the structure and shortens the production cycle. Furthermore, based on this integrally extruded structure, at least one frame rail 93 is provided on one side of the floor panel 9. This ensures the strength of the floor panel 91, eliminating the need for additional crossbeams. This further simplifies the structure of the vehicle floor panel 9 and reduces vehicle weight.

[0039] In the above embodiment, the number of frame rails 93 can be one, two, or more, depending on the strength requirements of the vehicle floor 9 and the distribution of the frame rails 93. This disclosure is not limited thereto. For example, the number of frame rails 93 can be two, with both frame rails 93 distributed on the floor main body 91. This arrangement can improve the structural strength and reliability of the floor main body 91. The two frame rails 93 can be evenly distributed on the floor main body 91 in the transverse direction of the vehicle, i.e., the distance between the two vehicle rails can be approximately equal to the distance between the vehicle rails and the transverse edge of the floor main body 91. This can improve the structural strength of the floor main body 91.

[0040] In other embodiments, a frame longitudinal beam 93 may also be provided at the lateral edge of the base plate body 91 to enhance the structural strength of the base plate body 91 .

[0041] Among them, the frame longitudinal beam 93 can be integrally formed with the floor main body 91, that is, the vehicle floor 9 in which the floor main body 91 and the frame longitudinal beam 93 are integrated can be directly obtained through the extrusion molding process, which helps to simplify the production process and improve the structural strength.

[0042] In other embodiments, the frame longitudinal beam 93 may be assembled to the bottom plate body 91 by welding, assembling connectors, etc. The present disclosure does not limit the arrangement of the frame longitudinal beam 93 .

[0043] It should be noted that when multiple frame longitudinal beams 93 are provided on one side of the vehicle floor 9, the extension directions of the multiple frame longitudinal beams 93 can be the same or different. For example, when two frame longitudinal beams 93 are provided on one side of the vehicle floor 9, the two frame longitudinal beams 93 can be spaced apart and both extend along the longitudinal direction of the vehicle floor 9 to provide support for the floor body 91 at different locations in the longitudinal direction of the vehicle floor 9. For another example, when four frame longitudinal beams 93 are provided on one side of the vehicle floor 9, two frame longitudinal beams 93 can extend along the longitudinal direction of the vehicle floor 9, and the extension directions of the other two frame longitudinal beams 93 can also form an angle with the longitudinal direction of the vehicle floor 9, which angle can be less than or equal to 90 degrees. The embodiments of the present application are not limited to this.

[0044] In some embodiments, the cross-sectional profile of the frame rail 93 may be rectangular, circular, triangular, irregular, etc., and the present disclosure does not limit the cross-sectional profile shape of the frame rail 93 .

[0045] The profile forming the frame rail 93 may enclose one or more first cavities 931, or a frame rail 93 and the floor panel body 91 may enclose one or more first cavities 931. This first cavity 931 can reduce the material cost and weight of the frame rail 93. In other embodiments, the frame rail 93 may also be a solid structure to increase the overall strength of the frame rail 93 and thereby enhance the strength of the floor panel body 91 along the direction in which the frame rail 93 extends.

[0046] In some embodiments, at least one third cavity 932 can be defined within the profile forming the frame rail 93. This third cavity 932 reduces the material cost and weight of the frame rail 93 while ensuring the structural strength of the profile of the frame rail 93. The third cavity 932 can extend along the extrusion direction of the frame rail 93 or be located anywhere within the frame rail 93. This disclosure does not limit the arrangement of the third cavity 932. For example, the third cavity 932 can extend longitudinally along the vehicle floor 9 and be distributed in a transverse array. These third cavities 932 can be separated by partitions arranged obliquely within the frame rail 93, forming frame rails 93 with a uniform longitudinal cross-sectional shape.

[0047] In addition, structures in the vehicle floor panel 9 that cannot be integrally formed with the floor panel main body 91 or that are difficult to integrally form can be connected through assembly, thereby reducing the overall molding difficulty of the vehicle floor panel 9 and helping to improve the structural reliability of the vehicle floor panel 9.

[0048] In some embodiments, the base plate body 91 can be a solid structure, which can increase the overall strength of the base plate body 91. In other embodiments, the base plate body 91 can be provided with at least one second cavity 92. The second cavity 92 can extend along the extrusion direction of the base plate body 91 (e.g., transversely, longitudinally, or in any other direction), or can be distributed anywhere within the base plate body 91. This disclosure does not limit the arrangement of the second cavity 92. For example, the second cavity 92 can extend longitudinally along the vehicle base plate 9 and be distributed in a transverse array. The second cavity 92 can be separated by partitions arranged obliquely within the base plate body 91 to form a base plate body 91 with the same longitudinal cross-sectional shape.

[0049] In some embodiments, the base plate body 91 may include a base and a plurality of reinforcing structures distributed on the surface of the base. The reinforcing structures can further increase the overall structural strength of the base plate body 91 and avoid deformation during the process of carrying goods.

[0050] Among them, the above-mentioned reinforcement structure can be at least one of ribs, textures and bumps protruding from the surface of the base, so as to increase the structural strength of the base plate body 91 from dimensions other than the base material and processing method through the distribution of multiple reinforcement structures on the surface of the base.

[0051] It should be noted that the vehicle floor panel 9 may be made of aluminum alloy, which can obtain sufficient strength after extrusion molding to replace at least a portion of the frame structure, thereby achieving structural simplification and lightweighting of the vehicle floor panel 9.

[0052] The present disclosure further provides a floor assembly. FIG2 is a structural schematic diagram of a vehicle floor in an exemplary embodiment of the present disclosure. As shown in FIG2 , the floor assembly 7 includes a load-bearing portion 71 and a gooseneck portion 72 that are fixedly connected. The above-mentioned vehicle floor 9 constitutes the load-bearing portion 71 .

[0053] The floor assembly 7 comprises a load-bearing portion 71 and a gooseneck portion 72. The load-bearing portion 71 carries cargo, while the gooseneck portion 72 facilitates assembly with vehicle components such as the front and traction mechanism. The load-bearing portion 71 is formed from the vehicle floor panel 9. The floor panel body 91 is a profiled, integrally extruded structure or steel structure, eliminating the need for extensive subsequent assembly processes. This simplifies the structure of the vehicle floor panel 9 and shortens its production cycle. The floor panel body 91 utilizes frame rails 93 to ensure operational strength, eliminating the need for additional crossbeams. This further simplifies the structure of the load-bearing portion 71 and reduces its weight.

[0054] In the above embodiment, the top surface of the gooseneck 72 and the bearing surface of the bearing portion 71 have a height difference in the thickness direction of the vehicle floor 9. The gooseneck 72 can raise the assembly height of the vehicle floor 9 on the gooseneck 72, thereby facilitating assembly of the vehicle floor 9 with the vehicle head and traction mechanism. Furthermore, the gooseneck 72 lowers the height of the bearing surface 911 of the vehicle floor 9, helping to improve vehicle carrying stability and the height of the cargo it can carry, thereby increasing cargo capacity.

[0055] In the above embodiment, the gooseneck 72 can be an integrally extruded structure. The integrally extruded gooseneck 72 can avoid excessive subsequent assembly processes, thereby simplifying the structure of the vehicle floor 9 and shortening the production cycle of the vehicle floor 9.

[0056] It should be noted that the gooseneck 72 can be connected to the load-bearing portion 71 by welding, riveting, clamping, connector assembly, etc. For example, the connector can be a threaded connector, and the end of the gooseneck 72 close to the load-bearing portion 71 is fixed to the load-bearing portion 71 by the threaded connector.

[0057] The gooseneck 72 can include a flat plate structure and a curved structure, with the curved structure and the flat plate structure integrally formed through an extrusion process. The curved structure extends from one end of the flat plate structure and is connected to the base plate body 91. The top surface 721 of the gooseneck 72 can be the surface of the flat plate structure, and the curved structure creates a height difference between the top surface 721 and the supporting surface 911 of the base plate body 91. Because the gooseneck 72 is integrally formed, this height difference can be achieved simply by connecting the curved structure to the supporting portion 71, simplifying assembly.

[0058] In the above embodiment, the material of the gooseneck 72 is the same as that of the bearing part 71. The gooseneck 72 and the bearing part 71 are respectively integrally formed by an extrusion process of the same material and then assembled together, which simplifies the process and helps to shorten the production cycle.

[0059] The material of the bearing portion 71 and the gooseneck portion 72 can also be aluminum alloy. Aluminum alloy has a density of 2.63 to 2.85 g / cm³ and high strength (σb is 110 to 650 MPa). Its specific strength is close to that of high-alloy steel, while its specific stiffness exceeds that of steel. It has excellent casting and plastic processing properties, as well as good electrical and thermal conductivity, corrosion resistance, and weldability. Therefore, after extrusion molding, it can achieve sufficient strength to replace at least a portion of the vehicle frame structure, thereby simplifying and lightweighting the vehicle floor panel 9. The aluminum alloys mentioned above can include non-heat-treatable aluminum alloys and heat-treatable aluminum alloys. Non-heat-treatable aluminum alloys are strengthened through cold working deformation. Non-heat-treatable aluminum alloys primarily include high-purity aluminum, industrial high-purity aluminum, industrial pure aluminum, and rust-proof aluminum. Heat-treatable aluminum alloys can improve their mechanical properties through heat treatments such as quenching and aging. Heat-treatable aluminum alloys can be categorized into hard aluminum, forged aluminum, super-hard aluminum, and special aluminum alloys. In addition, elements such as magnesium, manganese, and silicon can be added to aluminum materials to improve their performance.

[0060] Alternatively, the load-bearing portion 71 may also be made of other materials with a density lower than that of steel, so as to reduce the overall weight of the bottom plate body 91 after extrusion molding, thereby increasing the load capacity of the load-bearing portion 71 .

[0061] In other embodiments, one end of the vehicle floor 9 is bent to form a gooseneck-shaped gooseneck 72, and the structure connecting the vehicle floor 9 and the gooseneck 72 forms a load-bearing portion 71. The gooseneck 72 and the load-bearing portion 71 are a profile-type extruded integrally formed structure.

[0062] The present disclosure further provides a trailer floor 6. Figure 3 is a schematic cross-sectional view of a trailer floor 6 according to an exemplary embodiment of the present disclosure. As shown in Figure 3, the trailer floor 6 includes a load-bearing portion 61, a frame longitudinal beam 62, and a receiving structure 63. The receiving structure 63 is disposed at the bottom of the load-bearing portion 61 and defines a receiving cavity 631. The vehicle floor 9 described above constitutes the load-bearing portion 61. The structure and number of the frame longitudinal beams 62 can be found in the description of the frame longitudinal beams 93 and will not be repeated here.

[0063] The load-bearing portion 61 can carry cargo, while the frame rails 62 reinforce the structural strength of the load-bearing portion 61. The accommodating cavity 631 formed by the receiving structure 63 can be used to install the kinetic energy recovery system or other functional modules of the vehicle. The load-bearing portion 61 is composed of the vehicle floor panel 9. The floor panel body 91 is a profiled, extruded, one-piece structure, eliminating the need for extensive subsequent assembly processes. This simplifies the structure of the trailer floor panel 6 and shortens its production cycle. The floor panel body 91, through the frame rails 62, ensures operational strength and eliminates the need for additional crossbeams for the trailer floor panel 6, further simplifying the structure of the load-bearing portion 61 and reducing its weight.

[0064] Among them, the receiving structure 63 can be an integral extrusion-molded structure. The integral extrusion-molded receiving structure 63 can avoid excessive subsequent assembly processes, thereby simplifying the structure of the trailer floor 6 and shortening the production cycle of the trailer floor 6. The cross-section of the receiving cavity 631 surrounded by the receiving structure 63 can be rectangular, circular, rectangular with rounded corners, irregular structure, etc., and the present disclosure is not limited to this. The profile of the receiving structure 63 itself can be a solid structure or a structure with a cavity. The receiving cavity 631 surrounded by the receiving structure 63 can be a cavity with an opening, and the top opening of the receiving cavity 631 cooperates with the bottom surface of the bearing part 61 to form a closed cavity.

[0065] It should be noted that the aforementioned receiving structure 63 and the load-bearing portion 61 can be connected to the load-bearing portion 61 by welding, riveting, clamping, or assembly with connectors. For example, the connector can be a threaded connector, with the end of the receiving structure 63 proximal to the load-bearing portion 61 being secured to the load-bearing portion 61 via the threaded connector. The remaining configuration of the frame rail 62 and the load-bearing portion 61 can be similar to that of the vehicle floor panel 9 and will not be further described here.

[0066] The load-bearing portion 61 may be provided with one or more openings 611 along the longitudinal direction of the vehicle. These openings 611 may be used to thread pipes. The cross-sectional shape of the openings 611 may be circular, rectangular, triangular, or the like, and this disclosure is not limited thereto. For example, three openings 611 may form a group, with two groups of openings 611 disposed at each end of the load-bearing portion 61 along the transverse direction.

[0067] The present disclosure further provides a vehicle, which includes a wheel assembly 81 and the vehicle floor 9 or the floor assembly 7 . The wheel assembly 81 is provided at the bottom of the vehicle floor 9 .

[0068] Because the floor panel body 91 of the vehicle floor panel 9 is a one-piece extruded structure, redundant subsequent assembly processes are avoided, simplifying the structure of the vehicle floor panel 9 and shortening its production cycle. Furthermore, this one-piece extruded structure ensures the operational strength of the floor panel body 91 through the use of frame longitudinal rails, eliminating the need for additional supporting crossbeams for the floor panel body 91 in predetermined directions. This further simplifies the structure of the vehicle floor panel 9 and reduces its weight. Vehicles utilizing this vehicle floor panel 9 not only achieve weight reduction, simplified structure, and shortened production cycles, but also increase cargo carrying capacity due to the reduced deadweight of the vehicle floor panel 9.

[0069] In some embodiments, the vehicle may further include a suspension, and the vehicle floor 9 is assembled with the wheel assembly 81 through the suspension, thereby avoiding the need for an additional support beam for the vehicle floor 9. This not only reduces the processing cost, process and assembly time of the support beam, but also reduces the weight of the vehicle floor 9, thereby helping to increase the vehicle's load-bearing capacity.

[0070] It should be noted that the above-mentioned vehicle can be a trailer, a truck, etc., and the present disclosure does not limit this.

[0071] The above descriptions are some embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A vehicle floor, the vehicle floor (9) being an integrally formed structure; the vehicle floor (9) comprising a floor body (91), at least one frame longitudinal beam (93) being provided on one side of the floor body (91).

2. The vehicle floor panel according to claim 1, wherein: The number of the frame longitudinal beams (93) is two.

3. The vehicle floor panel according to claim 1, wherein: The frame longitudinal beam (93) encloses at least one first cavity (931).

4. The vehicle floor panel according to claim 1, wherein: At least one third cavity (932) is provided in the profile forming the frame longitudinal beam (93).

5. The vehicle floor panel according to claim 1, wherein: The bottom plate body (91) is a solid structure.

6. The vehicle floor panel according to claim 1, wherein: At least one second cavity (92) is provided in the bottom plate body (91).

7. A floor assembly, comprising a load-bearing portion (71) and a gooseneck portion (72) fixedly connected, wherein: The bearing portion (71) is formed by the vehicle floor panel (9) according to any one of claims 1 to 6.

8. The floor assembly according to claim 7, wherein: The gooseneck (72) is an integrally formed structure or a steel structure.

9. The floor assembly according to claim 8, wherein: One end of the vehicle floor (9) is bent to form the gooseneck (72) in the shape of a gooseneck.

10. The floor assembly according to claim 7, wherein: A height difference is provided between the top surface of the gooseneck (72) and the bearing surface of the bearing portion (71) in the thickness direction of the vehicle floor (9).

11. The floor assembly according to claim 7, wherein: The bearing portion (71) and the gooseneck portion (72) are made of the same material.

12. The floor assembly according to claim 7, wherein: The material of the vehicle floor panel (9) includes aluminum alloy.

13. A trailer floor, comprising a load-bearing portion (61), a frame longitudinal beam (62) and a receiving structure (63); the receiving structure (63) is arranged at the bottom of the load-bearing portion (61), and the receiving structure encloses a receiving cavity (631); wherein, The bearing portion (61) is formed by the vehicle floor panel (9) according to any one of claims 1 to 6.

14. A vehicle comprising: Wheel Assemblies(81) ； The vehicle floor panel (9) as claimed in any one of claims 1 to 6; Or, the base plate assembly (7) according to any one of claims 7 to 12; Or, the trailer floor (6) as claimed in claim 13; The wheel assembly (81) is provided at the bottom of the vehicle floor (9).

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