A structure of the lower body of a commercial vehicle and a commercial vehicle

Abstract

The present invention relates to a lower vehicle body structure of a commercial vehicle and a commercial vehicle. The lower vehicle body structure of the commercial vehicle includes: a frame, the frame includes a first longitudinal beam, a second longitudinal beam and a mounting beam; one end of the mounting beam is connected to the first longitudinal beam, and the other end is connected to the second longitudinal beam, and a middle area of the mounting beam arches upward to form a mounting portion, and the mounting portion is higher than the first longitudinal beam and the second longitudinal beam; a hydrogen storage assembly, the hydrogen storage assembly is installed at the bottom of the mounting portion. Since the hydrogen storage assembly is installed on the mounting beam, and the mounting beam is arranged between the first longitudinal beam and the second longitudinal beam. The installation of the hydrogen storage assembly does not occupy the installation space on the longitudinal beam of the frame, which is convenient for the arrangement of large-volume components such as the battery assembly and the exhaust assembly on the frame. At the same time, since the hydrogen storage assembly is located between the two longitudinal beams and is installed on the mounting portion higher than the first longitudinal beam and the second longitudinal beam, the ground clearance of the hydrogen storage assembly is increased, and the safety performance of the hydrogen storage assembly is improved.

Description

Technical Field

[0001] The present invention relates to the field of commercial vehicles powered by hydrogen fuel cells, and particularly to a structure of the lower body of a commercial vehicle and a commercial vehicle. Background Art

[0002] The automotive industry is an important pillar industry of the national economy and plays an important role in China's national economy and society. With the continuous and rapid development of China's economy and the acceleration of the urbanization process, the demand for automobiles will still maintain a growth trend for a long time to come. The resulting energy shortage and environmental pollution problems will become more prominent. Accelerating the development of fuel cell vehicles can not only effectively alleviate the energy and environmental pressure and promote the sustainable development of the automotive industry, but also be a strategic measure to accelerate the transformation and upgrading of the automotive industry, cultivate new economic growth points and international competitive advantages.

[0003] In related technologies, in consideration of alleviating energy and environmental pressure, some commercial vehicles use cleaner and pollution-free hydrogen as energy to drive the vehicles.

[0004] At present, the hydrogen storage unit is mostly arranged outside the longitudinal beam of the frame. However, there are many parts arranged on the longitudinal beam of the commercial vehicle, which causes great trouble to vehicle assembly. Summary of the Invention

[0005] An embodiment of the present invention provides a structure of the lower body of a commercial vehicle and a commercial vehicle, so as to solve the problem that there are many parts on the longitudinal beam of the frame in related technologies and it is difficult to arrange the hydrogen storage unit.

[0006] In a first aspect, a structure of the lower body of a commercial vehicle is provided, which includes: a frame, the frame includes a first longitudinal beam, a second longitudinal beam and a mounting beam; one end of the mounting beam is connected to the first longitudinal beam, the other end is connected to the second longitudinal beam, and a middle area of the mounting beam arches upward to form a mounting portion, the mounting portion is higher than the first longitudinal beam and the second longitudinal beam; a hydrogen storage assembly, the hydrogen storage assembly is installed at the bottom of the mounting portion. By installing the hydrogen storage assembly on the mounting beam between the first longitudinal beam and the second longitudinal beam, the number of parts on the longitudinal beam of the frame is reduced, and the difficulty of arranging the hydrogen storage assembly is lowered. By arching the mounting beam upward to form a mounting portion, the stiffness of the mounting beam can be improved, and the ground clearance of the hydrogen storage assembly is increased, improving the safety performance of the hydrogen storage assembly. Since the hydrogen storage assembly is arranged between the first longitudinal beam and the second longitudinal beam, flying stones outside the frame can be avoided from splashing onto the hydrogen storage assembly, better protecting the hydrogen storage assembly. Compared with placing the battery between the two longitudinal beams, in the present application, by placing the hydrogen storage assembly with a simpler structure and lower failure rate in the middle of the frame, the battery can be arranged outside the frame for subsequent maintenance of the battery and the electronic control system connected to the battery.

[0007] As shown in the figure, the mounting beam includes upper and lower plate bodies connected to each other. The two ends of the upper plate body are respectively connected to the upper wing plates of the first longitudinal beam and the second longitudinal beam, and the two ends of the lower plate body are respectively connected to the upper wing plates of the first longitudinal beam and the lower wing plates of the second longitudinal beam. That is, the mounting beam part is fixed to the vertical plate of the longitudinal beam, further reducing the occupation of the mounting space on the longitudinal beam, and the upper plate body and the lower plate body enclose a mounting channel at the longitudinal beam, which is convenient for the layout of pipelines inside the longitudinal beam. By connecting the upper plate body and the lower plate body in the central area to form a mounting part, compared with the mounting part of a single-layer structure, the mounting part in this embodiment is a multi-layer structure, further improving the bearing capacity of the mounting part.

[0008] In this embodiment, the hydrogen storage assembly is installed on the mounting beam supported at both ends, avoiding the need to add a cantilever bracket to raise the hydrogen storage assembly, which not only improves the installation strength of the hydrogen storage assembly, but also the mounting beam can be used as a cross beam of the vehicle frame to improve the strength of the vehicle frame. At the same time, the mounting beam can also be used to assist in the layout of pipelines inside the vehicle frame, reducing the number of pipeline brackets on the vehicle frame.

[0009] In some embodiments, the vehicle frame includes a plurality of mounting beams spaced apart from each other; the hydrogen storage assembly includes a hydrogen cylinder and a connecting beam, and the mounting beams are all connected to one side of the connecting beam. A plurality of spaced-apart clamps are installed on the other side of the connecting beam, and the clamps are all sleeved outside the hydrogen cylinder. That is to say, by connecting a plurality of clamps through the connecting beam, the number of parts connected to the vehicle frame is reduced. After the hydrogen storage assembly is assembled on the sub-assembly line in advance, the hydrogen storage assembly can be adjusted to the main assembly line and connected to the mounting beam, improving the installation efficiency of the hydrogen storage assembly. The weight of the hydrogen cylinder is borne by a plurality of mounting beams, reducing the load on a single mounting beam.

[0010] In some embodiments, a limit stop is connected to each of the head and tail ends of the connecting beam, and the two limit stops are respectively arranged at the head and tail ends of the hydrogen cylinder. That is to say, the hydrogen cylinder is limited by the limit stop to avoid the shaking of the hydrogen cylinder and improve the stability of the hydrogen cylinder. In this embodiment, a long groove is opened at the end of the connecting beam. After the hydrogen cylinder is connected to the clamp, the bolt at the top of the limit stop is inserted into the long groove, and the position of the limit stop is adjusted so that the limit stop abuts against the surface of the hydrogen cylinder to realize the installation of the limit stop. In this embodiment, the limit stop is a cylindrical structure with a gradually decreasing diameter, which is sleeved on the end of the hydrogen cylinder, and its small-diameter end restricts the axial shaking of the hydrogen cylinder.

[0011] In some embodiments, the connecting beam includes a beam body and a fixing bracket. One side of the fixing bracket is connected to the mounting beam, and the other side of the fixing bracket is provided with the hoop. That is to say, the hoop directly transmits the vertical force received from the hydrogen cylinder to the mounting beam through the fixing bracket. The stability of the hydrogen cylinder can be ensured by ensuring the strength of the mounting beam, the fixing bracket, and the hoop. The beam body mainly functions to connect multiple fixing brackets, and can fix the distance between multiple fixing brackets, so that multiple fixing brackets can be connected to the corresponding mounting beams. In this embodiment, the beam body is fixedly welded to the fixing bracket. In other embodiments, the beam body can also be connected to the fixing bracket by other connection methods.

[0012] In some embodiments, the fixing bracket includes a first limiting member, a second limiting member, and a supporting member. One side of the supporting member is connected to the first limiting member, and the other side is connected to the second limiting member. The first limiting member, the second limiting member, and the supporting member enclose a limiting space; the hoop is supported on the supporting member, and part of the hoop is inserted into the limiting space. That is to say, the fixing bracket can not only be used to connect the hoop, but also prevent the hoop from shaking by forming a limiting space, improving the positioning accuracy of the hoop. As can be seen from the figure, the supporting member is an arc-shaped plate structure, and the bottom surface of the hoop is in contact with the top surface of the supporting member to support the hoop.

[0013] In some embodiments, the hydrogen storage assembly further includes a protection frame, which includes a frame body assembly and a hanging assembly; the hanging assembly is supported above the hydrogen cylinder, the frame body assembly is detachably connected to the hanging assembly, and the hydrogen cylinder is received in the receiving space surrounded by the frame body assembly. When it is necessary to install the protection frame outside the hydrogen cylinder, first separate the hanging assembly from the frame body assembly, then hang the hanging assembly on the hydrogen cylinder, and then connect the frame body assembly to the hanging assembly so that the hydrogen cylinder is received in the receiving space surrounded by the frame body assembly. The provision of the protection frame can prevent the hydrogen cylinder from being damaged by external collisions and improve the safety performance of the hydrogen cylinder. In this embodiment, the hanging assembly includes a first unit and a second unit, and the first unit and the second unit are detachably connected. In use, separate the first unit from the second unit, then hang the first unit above the hydrogen cylinder, and then connect the second unit to the first unit to complete the installation of the hanging assembly. In this embodiment, the frame body assembly further includes a bottom plate unit and side plate units on both sides. Among them, the bottom plate unit is installed on the top of the second unit, and the side plate units are installed on the side of the first unit close to the hydrogen cylinder. Through the connection of the first unit and the second unit, the side plate units and the bottom plate unit are connected to enclose a receiving space for receiving the hydrogen cylinder.

[0014] In some embodiments, the hanging component is connected to the fixing frame. By connecting the hanging component to the fixing frame, the relative position between the protection frame and the fixing frame is determined, avoiding the position deviation of the protection frame relative to the hydrogen cylinder, and enabling better accommodation of the hydrogen cylinder. In this embodiment, the first unit is bolted to the first limiting member of the fixing frame to connect the hanging component to the fixing frame. During subsequent disassembly and assembly, the hanging component can be separated from the fixing frame by removing the connecting bolts. In other embodiments, the hanging component can also be connected to the fixing frame by other connection methods such as clamping and plugging.

[0015] In some embodiments, the lower vehicle body structure of the commercial vehicle further includes a battery assembly and an exhaust assembly, and both the battery assembly and the exhaust assembly are arranged outside the vehicle frame. By arranging the hydrogen storage assembly inside the vehicle frame, more installation space is reserved for the battery assembly and the exhaust assembly arranged outside the vehicle frame. And by arranging the battery assembly outside the vehicle frame, it is convenient for subsequent maintenance and replacement of the battery. Arranging the exhaust assembly outside the vehicle frame is beneficial for the maintenance of the exhaust assembly. The probability of failure of the hydrogen storage assembly after production is relatively low, and arranging it inside the vehicle frame will not overly affect the normal use of the hydrogen storage assembly. Instead, it reduces the impact of the external environment on the hydrogen storage assembly and reduces the failure rate of the hydrogen storage assembly.

[0016] In some embodiments, the battery assembly and the exhaust assembly are respectively arranged on opposite sides of the vehicle frame. By arranging the battery assembly and the exhaust assembly on opposite sides of the vehicle frame respectively, the distance between the battery assembly and the exhaust assembly is ensured. This avoids the occurrence of failures due to overheating of both, and further improves the safety performance of the battery assembly and the exhaust assembly during use.

[0017] In a second aspect, a commercial vehicle is provided, which includes the above-mentioned lower vehicle body structure of the commercial vehicle.

[0018] The beneficial effects brought by the technical solution provided by the present invention include:

[0019] Embodiments of the present invention provide a lower vehicle body structure and a commercial vehicle for a commercial vehicle. Since the hydrogen storage assembly is installed on the installation beam, and the installation beam is arranged between the first longitudinal beam and the second longitudinal beam. The installation of the hydrogen storage assembly does not occupy the installation space on the vehicle frame longitudinal beam, facilitating the arrangement of large-volume components such as the battery assembly and the exhaust assembly on the vehicle frame. Since the hydrogen storage assembly generally does not require frequent maintenance or adjustment after installation, arranging the hydrogen storage assembly between the first longitudinal beam and the second longitudinal beam will not affect the normal use of the hydrogen storage assembly. At the same time, since the hydrogen storage assembly is located between the two longitudinal beams and is installed on an installation part higher than the first longitudinal beam and the second longitudinal beam, the ground clearance of the hydrogen storage assembly is increased, and the interference of the external environment is reduced, improving the safety performance of the hydrogen storage assembly. Therefore, a lower vehicle body structure and a commercial vehicle with convenient arrangement and high safety performance are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the lower body structure of a commercial vehicle provided by an embodiment of the present invention;

[0022] Figure 2 It is a top view structure schematic diagram of the lower body structure of a commercial vehicle provided by an embodiment of the present invention;

[0023] Figure 3 It is a three-dimensional structure schematic diagram of a hydrogen storage assembly provided by an embodiment of the present invention.

[0024] In the figure:

[0025] 1. Frame; 11. First longitudinal beam; 12. Second longitudinal beam; 13. Installation beam; 131. Installation part;

[0026] 2. Hydrogen storage assembly; 21. Hydrogen cylinder;

[0027] 22. Connection beam; 221. Beam body; 2211. Long groove; 222. Fixed frame; 2221. First limiting part; 2222. Second limiting part; 2223. Support part; 2224. Limiting space;

[0028] 23. Hoop; 24. Protection frame; 241. Frame body assembly; 2411. Bottom plate unit; 2412. Side plate unit; 242. Hanging assembly; 2421. First unit; 2422. Second unit; 25. Limiting stop;

[0029] 3. Battery assembly;

[0030] 4. Exhaust assembly. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0032] An embodiment of the present invention provides a lower body structure of a commercial vehicle and a commercial vehicle, which can solve the problems of many parts arranged on the longitudinal beam of the commercial vehicle and difficult arrangement of the hydrogen storage assembly.

[0033] The following will combine the accompanying drawings to detail the lower body structure of the commercial vehicle and the commercial vehicle of the present application. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0034] See Figure 1 And Figure 3 As shown, an embodiment of the present invention provides a lower body structure of a commercial vehicle, which may include: a frame 1, the frame 1 includes a first longitudinal beam 11, a second longitudinal beam 12, and a mounting beam 13; one end of the mounting beam 13 is connected to the first longitudinal beam 11, and the other end is connected to the second longitudinal beam 12, and a middle area of the mounting beam 13 arches upward to form a mounting portion 131, and the mounting portion 131 is higher than the first longitudinal beam and the second longitudinal beam 12; a hydrogen storage assembly 2, the hydrogen storage assembly 2 is installed at the bottom of the mounting portion 131.

[0035] By installing the hydrogen storage assembly 2 on the mounting beam 13 between the first longitudinal beam 11 and the second longitudinal beam 12, the number of parts on the longitudinal beam of the frame 1 is reduced, and the arrangement difficulty of the hydrogen storage assembly 2 is lowered. By arching the mounting beam 13 upward to form the mounting portion 131, the stiffness of the mounting beam 13 can be improved, and the ground clearance of the hydrogen storage assembly 2 is raised, improving the safety performance of the hydrogen storage assembly 2. Since the hydrogen storage assembly 2 is arranged between the first longitudinal beam 11 and the second longitudinal beam 12, flying stones outside the frame can be avoided from splashing onto the hydrogen storage assembly 2, better protecting the hydrogen storage assembly 2. Compared with placing the battery between the two longitudinal beams, in the present application, by placing the hydrogen storage assembly 2 with a simpler structure and lower failure rate in the middle of the frame, the battery can be arranged outside the frame for subsequent maintenance of the battery and the electronic control system connected to the battery.

[0036] See Figure 1 As shown, the mounting beam 13 includes upper and lower two-layer plates connected to each other. Two ends of the upper-layer plate are respectively connected to the upper wing plates of the first longitudinal beam 11 and the second longitudinal beam 12, and two ends of the lower-layer plate are respectively connected to the upper wing plates of the first longitudinal beam 11 and the lower wing plates of the second longitudinal beam 12. That is, the mounting beam 13 is fixed to the vertical plates of the longitudinal beam, further reducing the occupation of the mounting space on the longitudinal beam, and the upper-layer plate and the lower-layer plate enclose a mounting channel at the longitudinal beam, which is convenient for the layout of pipelines inside the longitudinal beam. By connecting the upper-layer plate and the lower-layer plate in the central area to form the mounting portion 131, compared with the mounting portion 131 of a single-layer structure, the mounting portion 131 in this embodiment is a multi-layer structure, further improving the bearing capacity of the mounting portion 131.

[0037] In this embodiment, the hydrogen storage assembly 2 is installed on the mounting beam 13 supported at both ends, avoiding the need to add a cantilever bracket to raise the hydrogen storage assembly 2. This not only improves the installation strength of the hydrogen storage assembly 2, but also the mounting beam 13 can be used as a cross beam of the vehicle frame to enhance the strength of the vehicle frame 1. At the same time, the mounting beam 13 can also be used to assist in the layout of the internal pipelines of the vehicle frame 1, reducing the number of pipeline brackets on the vehicle frame 1.

[0038] In this embodiment, the hydrogen storage assembly 2 stores hydrogen using hydrogen cylinders 21 with a bottled structure. In other embodiments, if there are hydrogen storage devices with other structures, they can also be used to construct the hydrogen storage assembly 2 in this application. That is to say, it is not limited that the hydrogen storage assembly 2 can only store hydrogen using a bottle-like structure.

[0039] See Figure 1 and Figure 2 As shown, in some alternative embodiments, the vehicle frame 1 includes a plurality of spaced-apart mounting beams 13; the hydrogen storage assembly 2 includes hydrogen cylinders 21 and a connecting beam 22. The mounting beams 13 are all connected to one side of the connecting beam 22, and a plurality of spaced-apart clamps 23 are installed on the other side of the connecting beam 22, and the clamps 23 are all clamped outside the hydrogen cylinders 21. That is to say, by connecting a plurality of clamps 23 through the connecting beam 22, the number of parts connected to the vehicle frame 1 is reduced. The hydrogen storage assembly 2 can be pre-assembled on the sub-assembly line and then adjusted to the main assembly line to be connected to the mounting beam 13, improving the installation efficiency of the hydrogen storage assembly 2. The weight of the hydrogen cylinders 21 is borne by a plurality of mounting beams 13, reducing the load on a single mounting beam 13.

[0040] Specifically, the mounting beams 13 are arranged in parallel, and the distance between adjacent mounting beams 13 is equal. The hydrogen cylinders 21 and the connecting beam 22 both extend along the length direction of the vehicle frame 1 so that the connecting beam 22 can be connected to a plurality of mounting beams 13 at the same time.

[0041] In this embodiment, the mounting beam 13 is an axisymmetric figure, and the axis of symmetry of the mounting beam 13 and the axis of the hydrogen cylinder 21 are in the same vertical plane to ensure that the mounting beam 13 bears a uniform load.

[0042] See Figures 1 to 3As shown, in some alternative embodiments, a limiting stop 25 is connected to each of the head and tail ends of the connecting beam 22, and the two limiting stops 25 are respectively arranged to block the head and tail ends of the hydrogen cylinder 21. That is to say, the hydrogen cylinder 21 is limited by the limiting stops 25 to avoid the shaking of the hydrogen cylinder 21 and improve the stability of the hydrogen cylinder 21. In this embodiment, a long slot 2211 is formed at the end of the connecting beam 22. After the hydrogen cylinder 21 is connected to the hoop 23, the bolt at the top of the limiting stop 25 is inserted into the long slot 2211, and the position of the limiting stop 25 is adjusted so that the limiting stop 25 abuts against the surface of the hydrogen cylinder 21 to realize the installation of the limiting stop 25. In this embodiment, the limiting stop 25 is a cylindrical structure with a gradually decreasing diameter, which is sleeved on the end of the hydrogen cylinder 21, and the axial shaking of the hydrogen cylinder 21 is restricted by its small-diameter end.

[0043] See Figure 3 As shown, in some alternative embodiments, the connecting beam 22 includes a beam body 221 and a fixing frame 222. One side of the fixing frame 222 is connected to the mounting beam 13, and the hoop 23 is mounted on the other side of the fixing frame 222. That is to say, the vertical force received by the hoop 23 from the hydrogen cylinder 21 is directly transmitted to the mounting beam 13 through the fixing frame 222, and the stability of the hydrogen cylinder 21 can be ensured by ensuring the strength of the mounting beam 13, the fixing frame 222 and the hoop 23. The main function of the beam body 221 is to connect multiple fixing frames 222, and the distance between multiple fixing frames 222 can be fixed, so that multiple fixing frames 222 can be connected to the corresponding mounting beam 13. In this embodiment, the beam body 221 is welded and fixed to the fixing frame 222. In other embodiments, the beam body 221 can also be connected to the fixing frame 222 by other connection methods.

[0044] See Figure 3 As shown, in some alternative embodiments, the fixing frame 222 includes a first limiting member 2221, a second limiting member 2222 and a support member 2223. One side of the support member 2223 is connected to the first limiting member 2221, and the other side is connected to the second limiting member 2222. The first limiting member 2221, the second limiting member 2222 and the support member 2223 enclose a limiting space 2224; the hoop 23 is supported on the support member 2223, and a part of the hoop 23 is inserted into the limiting space 2224. That is to say, the fixing frame 222 can not only be used to connect the hoop 23, but also avoid the shaking of the hoop 23 by forming the limiting space 2224, thereby improving the positioning accuracy of the hoop 23. See Figure 3 As can be seen, the support member 2223 is an arc-shaped plate structure, and the bottom surface of the hoop 23 is in contact with the top surface of the support member 2223 so that the support member 2223 can support the hoop 23.

[0045] See Figure 3As shown, in some alternative embodiments, the hydrogen storage assembly 2 further includes a protection frame 24, and the protection frame 24 includes a frame body assembly 241 and a hanging assembly 242; the hanging assembly 242 is supported above the hydrogen cylinder 21, the frame body assembly 241 is detachably connected to the hanging assembly 242, and the hydrogen cylinder 21 is received in the receiving space surrounded by the frame body assembly 241. When it is necessary to install the protection frame 24 outside the hydrogen cylinder 21, first separate the hanging assembly 242 from the frame body assembly 241, then hang the hanging assembly 242 on the hydrogen cylinder 21, and then connect the frame body assembly 241 to the hanging assembly 242 so that the hydrogen cylinder 21 is received in the receiving space surrounded by the frame body assembly 241. The provision of the protection frame 24 can prevent the hydrogen cylinder 21 from being damaged due to external collisions, improving the safety performance of the hydrogen cylinder 21.

[0046] In this embodiment, the hanging assembly includes a first unit 2421 and a second unit 2422, and the first unit 2421 is detachably connected to the second unit 2422. In use, separate the first unit 2421 from the second unit 2422, then hang the first unit 2421 above the hydrogen cylinder 21, and then connect the second unit 2422 to the first unit 2421 to complete the installation of the hanging assembly 242. In this embodiment, the frame body assembly 241 further includes a bottom plate unit 2411 and side plate units 2412 on both sides. Among them, the bottom plate unit 2411 is installed on the top of the second unit 2422, and the side plate units 2412 are installed on the side of the first unit 2421 close to the hydrogen cylinder 21. Through the connection between the first unit 2421 and the second unit 2422, the side plate units 2412 are connected to the bottom plate unit 2411 to enclose a receiving space for accommodating the hydrogen cylinder 21.

[0047] See Figure 3 As shown, in some alternative embodiments, the hanging assembly 242 is connected to the fixing frame 222. By connecting the hanging assembly 242 to the fixing frame 222, the relative positions of the protection frame 24 and the fixing frame 222 are determined, avoiding the position deviation of the protection frame 24 relative to the hydrogen cylinder 21, and the hydrogen cylinder 21 can be better accommodated. In this embodiment, the first unit 2421 is bolted to the first limiting member 2221 of the fixing frame 222 to connect the hanging assembly 242 to the fixing frame 222. During subsequent disassembly and assembly, the hanging assembly 242 can be separated from the fixing frame 222 by removing the connecting bolts. In other embodiments, the hanging assembly 242 can also be connected to the fixing frame 222 by other connection methods such as clamping and plugging.

[0048] See Figure 1 and Figure 2As shown, in some alternative embodiments, the lower body structure of the commercial vehicle further includes a battery assembly 3 and an exhaust assembly 4, and both the battery assembly 3 and the exhaust assembly 4 are arranged outside the frame 1. By arranging the hydrogen storage assembly 2 inside the frame 1, more installation space is reserved for the battery assembly 3 and the exhaust assembly 4 arranged outside the frame 1. And by arranging the battery assembly 3 outside the frame, it is convenient for subsequent maintenance and replacement of the battery assembly 3. Arranging the exhaust assembly 4 outside the frame 1 is beneficial to the maintenance of the exhaust assembly 4. The probability of failure of the hydrogen storage assembly 2 after production is relatively low. Arranging it inside the frame 1 will not overly affect the normal use of the hydrogen storage assembly 2, but instead reduces the impact of the external environment on the hydrogen storage assembly 2 and reduces the failure rate of the hydrogen storage assembly 2.

[0049] See Figure 3 As shown, in some alternative embodiments, the battery assembly 3 and the exhaust assembly 4 are respectively arranged on opposite sides of the frame 1. By respectively arranging the battery assembly 3 and the exhaust assembly 4 on opposite sides of the frame 1, the distance between the battery assembly 3 and the exhaust assembly 4 is ensured. This avoids the occurrence of failures due to overheating of the two, and further improves the safety performance of the battery assembly 3 and the exhaust assembly 4 during use.

[0050] The embodiment of the present invention also provides a commercial vehicle, which includes the above-mentioned lower body structure of the commercial vehicle. By installing the hydrogen storage assembly 2 on the installation beam 13 between the first longitudinal beam 11 and the second longitudinal beam 12, the number of parts on the longitudinal beam of the frame 1 is reduced, and the layout difficulty of the hydrogen storage assembly 2 is lowered. By arching the installation beam 13 upward to form an installation part 131, the stiffness of the installation beam 13 can be improved, and the ground clearance of the hydrogen storage assembly 2 is raised, improving the safety performance of the hydrogen storage assembly 2. Since the hydrogen storage assembly 2 is arranged between the first longitudinal beam 11 and the second longitudinal beam 12, flying stones outside the frame can be avoided from splashing onto the hydrogen storage assembly 2, better protecting the hydrogen storage assembly 2. Compared with placing the battery between the two longitudinal beams, in this application, by placing the hydrogen storage assembly 2 with a simpler structure and lower failure rate in the middle of the frame, the battery can be arranged outside the frame for subsequent maintenance of the battery and the electronic control system connected to the battery.

[0051] See Figure 1As shown in the figure, the mounting beam 13 includes two connected upper and lower plate bodies. The two ends of the upper plate body are respectively connected to the upper wing plates of the first longitudinal beam 11 and the second longitudinal beam 12, and the two ends of the lower plate body are respectively connected to the upper wing plates of the first longitudinal beam 11 and the lower wing plates of the second longitudinal beam 12. That is, the mounting beam 13 is fixed to the vertical plates of the longitudinal beams, further reducing the occupation of the mounting space on the longitudinal beams. Moreover, the upper plate body and the lower plate body enclose a mounting channel at the longitudinal beams, which is convenient for the layout of pipelines inside the longitudinal beams. By connecting the upper plate body and the lower plate body in the central area to form the mounting part 131, compared with the mounting part 131 of a single-layer structure, the mounting part 131 in this embodiment is a multi-layer structure, further improving the bearing capacity of the mounting part 131.

[0052] In this embodiment, the hydrogen storage assembly 2 is installed on the mounting beam 13 supported at both ends, avoiding the need to add a cantilever bracket to raise the hydrogen storage assembly 2. This not only improves the installation strength of the hydrogen storage assembly 2, but also the mounting beam 13 can be used as a cross beam of the vehicle frame to improve the strength of the vehicle frame 1. At the same time, the mounting beam 13 can also be used to assist in the layout of the pipelines inside the vehicle frame 1, reducing the number of pipeline brackets on the vehicle frame 1.

[0053] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation of the present invention. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0054] It should be noted that in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0055] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A structure of the lower body of a commercial vehicle, characterized in that, It includes: A vehicle frame (1), the vehicle frame (1) includes a first longitudinal beam (11), a second longitudinal beam (12) and a mounting beam (13); One end of the mounting beam (13) is connected to the first longitudinal beam (11), the other end is connected to the second longitudinal beam (12), and a middle area of the mounting beam (13) arches upward to form a mounting portion (131), and the mounting portion (131) is higher than the first longitudinal beam and the second longitudinal beam (12); A hydrogen storage assembly (2), the hydrogen storage assembly (2) is installed at the bottom of the mounting portion (131); The mounting beam (13) includes upper and lower plate bodies connected to each other. Two ends of the upper plate body are respectively connected to the upper wing plates of the first longitudinal beam (11) and the second longitudinal beam (12), and two ends of the lower plate body are respectively connected to the lower wing plates of the first longitudinal beam (11) and the second longitudinal beam (12); The lower vehicle body structure of the commercial vehicle further includes a battery assembly (3) and an exhaust assembly (4), and both the battery assembly (3) and the exhaust assembly (4) are arranged outside the vehicle frame (1); The battery assembly (3) and the exhaust assembly (4) are respectively arranged on opposite sides of the vehicle frame (1).

2. The lower vehicle body structure of the commercial vehicle according to claim 1, characterized in that: The vehicle frame (1) includes a plurality of mounting beams (13) spaced apart from each other; The hydrogen storage assembly (2) includes a hydrogen cylinder (21) and a connecting beam (22). The mounting beams (13) are all connected to one side of the connecting beam (22), and a plurality of spaced-apart clamps (23) are installed on the other side of the connecting beam (22), and the clamps (23) are all clamped outside the hydrogen cylinder (21).

3. The lower vehicle body structure of the commercial vehicle according to claim 2, characterized in that: One limit stop (25) is connected to each of the head and tail ends of the connecting beam (22), and the two limit stops (25) respectively block the head and tail ends of the hydrogen cylinder (21).

4. The lower vehicle body structure of the commercial vehicle according to claim 2, characterized in that: The connecting beam (22) includes a beam body (221) and a fixing bracket (222). One side of the fixing bracket (222) is connected to the mounting beam (13), and the clamps (23) are installed on the other side of the fixing bracket (222).

5. The lower vehicle body structure of the commercial vehicle according to claim 4, characterized in that: The fixing bracket (222) includes a first limiting member (2221), a second limiting member (2222) and a support member (2223). One side of the support member (2223) is connected to the first limiting member (2221), and the other side is connected to the second limiting member (2222). The first limiting member (2221), the second limiting member (2222) and the support member (2223) enclose a limiting space (2224); The clamp (23) is supported on the support member (2223), and the clamp (23) partially inserts into the limiting space (2224).

6. The lower vehicle body structure of the commercial vehicle according to claim 4, characterized in that: The hydrogen storage assembly (2) further includes a protection frame (24), and the protection frame (24) includes a frame body assembly (241) and a hanging assembly (242); The hanging assembly (242) is supported above the hydrogen cylinder (21), the frame body assembly (241) is detachably connected to the hanging assembly (242), and the hydrogen cylinder (21) is received in the receiving space surrounded by the frame body assembly (241).

7. The structure of the lower vehicle body of a commercial vehicle according to claim 6, wherein: The hanging assembly (242) is connected to the fixing frame (222).

8. A commercial vehicle, characterized in that, It includes: The structure of the lower vehicle body of a commercial vehicle according to any one of claims 1-7.

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