A cab-over-engine van box structure and expansion method

Abstract

The application relates to the technical field of van, and discloses a van box structure with a through expansion on the cab and an expansion method, which comprises a vehicle body, the upper side of the vehicle body is respectively provided with a cab body and a main cargo compartment, the main cargo compartment comprises a box bottom plate, a left side plate, a right side plate, a top cover plate and a rear tail door, the main cargo compartment is provided with an extended loading area which is formed by extending forward and striding over the upper area of the cab body, and the extended loading area is in communication with the main cargo compartment. The idle space above the cab body is converted into a loading area of the box by extending the main cargo compartment forward and striding over the upper area of the cab body, the space above the cab body which cannot be utilized is converted into a loading area of the box, the chassis does not need to be additionally lengthened and widened, the capacity of the box can be improved, and the space utilization and the loading capacity of the vehicle within the range of the limit value of the road traffic regulations and the overall vehicle announcement outer dimension constraint can be improved.

Description

Technical Field

[0001] This invention relates to the field of van technology, specifically to a van cargo box structure and expansion method that extends through the top of the cab. Background Technology

[0002] Box trucks typically have an enclosed cargo box behind the cab. The cargo box is formed by components such as the floor, side panels, top cover, and rear tailgate. The front of the traditional cargo box usually ends at the rear of the cab, making the cab and the rear cargo box spatially independent. The space above the cab is usually not included in the effective cargo area of ​​the cargo box.

[0003] While some existing box trucks have storage boxes on the top of the cab for storing tools or other miscellaneous items, these storage boxes are usually separate units that are isolated from the main cargo box at the rear, and cannot form a continuous main cargo space. Therefore, they are difficult to use for loading large quantities of goods.

[0004] The inventors of this application discovered in their research that the core defect of the aforementioned prior art is that when a van needs to increase its cargo box volume, it usually expands the cargo space by increasing the length, width, or height of the cargo box. However, the overall external dimensions of the vehicle are limited by requirements such as vehicle announcements and road traffic regulations. When the overall length and height of the vehicle are close to the allowable range, it is limited to continue to expand the capacity by lengthening or widening the chassis and increasing the external dimensions of the cargo box. This not only reduces the space for adjusting the overall dimensions of the vehicle, but may also require the chassis and related installation structures to be re-adapted. Summary of the Invention

[0005] This invention provides a cargo box structure and expansion method for a van with a through-type expansion above the cab, which solves the problem that the effective volume of the cargo box is limited by the overall vehicle dimensions and is difficult to increase further, thereby improving the space utilization rate under the constraint of the vehicle's unit dimensions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cargo box structure for a van with an extended capacity above the cab, comprising a vehicle body, wherein a cab body and a main cargo box are respectively provided on the upper side of the vehicle body, the main cargo box comprising a cargo box floor, a left side panel, a right side panel, a top cover and a rear tailgate, wherein the main cargo box extends forward across the area above the cab body to provide an extended cargo area, the extended cargo area being interconnected with the main cargo box.

[0007] By adopting the above technical solution, the previously unused upper space above the cab is fully utilized, and the effective cargo volume of the cargo box is increased without widening or lengthening the entire vehicle. The overall outer contour of the main cargo box and the extended cargo area is controlled within the total length and height limits of the vehicle announcement, and the vehicle does not exceed the length or height limits. The volume expansion is completed in compliance with regulations, avoiding the problem of exceeding limits.

[0008] Preferably, a safety gap is reserved between the floor of the extended cargo area and the top surface of the cab body, so that the two do not come into contact or interfere with each other.

[0009] Preferably, a partition can be detached at the connection between the main cargo compartment and the extended cargo area, and mounting strips are installed on both the upper and lower sides of the partition.

[0010] Preferably, the main cargo compartment and the extended cargo area are connected as a single unit without internal partitions.

[0011] Preferably, the main cargo compartment and the extended cargo area are an integrated whole, which is different from a separate storage box that is added later and separated from the main cargo compartment.

[0012] Preferably, the interior of the extended cargo area is provided with a slot and an installation slot, and the inner wall of the slot is set on the outer wall of the installation strip.

[0013] Preferably, a limiting groove is formed inside the partition, and an installation mechanism is provided inside the partition. The installation mechanism includes a T-shaped rod, the outer wall of which is disposed inside the partition. A transmission rod is rotatably connected to the outer wall of the T-shaped rod, and a trapezoidal block is installed on the outer wall of the transmission rod. Both the trapezoidal block and the outer wall of the transmission rod are slidably connected inside the partition.

[0014] Preferably, the outer wall of the trapezoidal block is provided with a ball bearing, the outer wall of the ball bearing is equipped with a movable frame, a spring is installed between the movable frame and the partition, the outer wall of the movable frame is slidably connected to the inside of the partition, and the side of the movable frame away from the partition is inserted into the inner wall of the mounting groove.

[0015] Preferably, the outer wall of the T-shaped rod is provided with two limiting blocks, and the two limiting blocks are respectively located on the upper and lower sides of the T-shaped rod. The outer contour dimension of the lower limiting block is larger than that of the upper limiting block, and the outer wall of the limiting block can be inserted into the inner wall of the limiting groove.

[0016] Preferably, a method for expanding the cargo box structure of a van that extends through the cab is provided, the method comprising the following steps: S1. Extend the main cargo box towards the cab body to cross the cab body and set up an extended cargo area. At the same time, a safety gap is reserved between the floor of the extended cargo area and the top surface of the cab body so that the two do not contact or interfere with each other. S2. The extended cargo area and the main cargo box are set as an integrated box, so that the internal space of the extended cargo area and the internal space of the main cargo box are directly connected to obtain a complete large-volume through cargo space. S3. When a large loading space needs to be fully connected, no partition is installed. The extended cargo area and the main cargo box are completely connected internally. Goods can be freely placed between the extended cargo area and the main cargo box. The cargo volume can be expanded directly by utilizing the area above the cab. S4. When it is necessary to partition the cargo box to isolate the extended cargo area from the main cargo box, execute the partition assembly and locking procedure: Align the mounting strips on the upper and lower sides of the partition with the slots at the connection point between the compartment and insert the partition into the connection between the main cargo compartment and the extended cargo area. At this time, pushing the T-shaped rod causes the transmission rod to move horizontally, the transmission rod causes the trapezoidal block to slide, and the trapezoidal block pushes the moving frame to move inward against the spring force through the ball bearings; After the partition is inserted into place, release the T-shaped rod. The spring force pushes the movable frame to extend and insert it into the mounting slot of the compartment, thus locking the partition. The partition separates the extended cargo area and the main cargo compartment into two independent cargo chambers for separate use. S5. When it is necessary to restore the through-through expansion state, rotate the T-shaped rod so that the position of the limiting block corresponds to the outer opening of the limiting groove. At this time, push the T-shaped rod to drive the transmission rod to move into the interior of the partition. The trapezoidal block drives the ball bearings and the moving frame to move towards the partition, thereby releasing the locking of the partition. The partition can be directly removed, and the extended cargo area and the main cargo box can be restored to the extended cargo state of mutual connection.

[0017] By adopting the above technical solution and through the cooperation of the above components, it is easy to quickly disassemble and assemble the partition, switch between two cargo box working modes: space partitioning and full passage. The locking relies on the insertion of the movable frames on both sides into the box mounting slot to achieve multi-point limiting. Compared with simple buckles, it improves the fixing reliability of the partition after installation, resists the bumps and vibrations of vehicle driving, and reduces the risk of the partition loosening and shifting. The ball bearings and inclined plane transmission reduce the friction of the internal moving parts, making the partition locking and unlocking operation smooth and less prone to jamming.

[0018] This invention provides a cargo box structure and expansion method for a van that extends above the cab. It offers the following advantages: 1. This invention extends the main cargo box forward, crossing over the cab to form an extended cargo area. It transforms the previously unused space above the cab into a cargo area, increasing the cargo box volume without needing to lengthen or widen the chassis. This improves the vehicle's space utilization and cargo capacity within the limits of road traffic regulations and vehicle dimensions, reducing the need to adjust chassis dimensions due to cargo box expansion.

[0019] 2. The present invention, through the arrangement of T-shaped rod, transmission rod, trapezoidal block, ball bearing, movable frame and spring, allows the movable frame to be inserted into or slid out of the inner wall of the mounting groove simply by pushing the T-shaped rod, thereby locking or releasing the partition. No additional bolts, pins, wrenches or other external tools are required, simplifying the assembly and disassembly of the partition and allowing for quick switching between the two working states of the cargo box: a divided double cavity and an overall through-hole design.

[0020] 3. By incorporating the recessed area, limiting groove, and limiting block on the partition surface, this invention prevents the T-shaped rod from completely sliding into the partition when subjected to external force. This avoids the movable frame from sliding completely out of the inner wall of the mounting groove, thus preventing the locking components of the partition from failing under the influence of external force. Only by actively rotating and pushing the T-shaped rod, and through the cooperation of the limiting block with the recessed area and limiting groove on the partition surface, can the limiting block be pressed against the inner wall of the limiting groove, releasing the T-shaped rod, freeing up both hands, and facilitating subsequent partition installation and disassembly operations. Attached Figure Description

[0021] Figure 1 This is an overall side view of the present invention; Figure 2 This is a top view schematic diagram of the present invention; Figure 3 This is a partial structural diagram of the partition of the present invention; Figure 4 This is a partial structural diagram of the mobile frame of the present invention; Figure 5 This is a schematic diagram of the internal structure of the extended cargo area of ​​the present invention; Figure 6 This is a partial structural diagram of the installation mechanism of the present invention; Figure 7 This is a cross-sectional view of the internal structure of the partition of the present invention; Figure 8 This is a partial structural diagram of the trapezoidal block of the present invention.

[0022] The components include: 1. Vehicle body; 2. Cab main body; 3. Main cargo box; 4. Extended cargo area; 5. Card slot; 6. Partition; 7. Mounting strip; 8. Mounting groove; 9. Mounting mechanism; 10. Limiting groove. 91. T-shaped rod; 92. Transmission rod; 93. Trapezoidal block; 94. Ball bearing; 95. Moving frame; 96. Spring; 97. Limiting block. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0024] Please see the appendix Figure 1 -Appendix Figure 5 This invention provides a cargo box structure for a van with an extended capacity above the cab, including a vehicle body 1. The upper side of the vehicle body 1 is provided with a cab body 2 and a main cargo box 3. The main cargo box 3 includes a cargo box floor, a left side panel, a right side panel, a top cover, and a rear tail door. The main cargo box 3 extends forward across the area above the cab body 2 and is provided with an extended cargo area 4. The extended cargo area 4 is connected to the main cargo box 3.

[0025] Specifically, the extended cargo area 4 is an overhanging section extending forward from the main cargo box 3. The entire load of the cargo and the cargo box is borne by the vehicle body 1 and the frame of the main cargo box 3. The vehicle body 1 serves as the chassis component of the truck, providing a load-bearing installation foundation for the cab body 2 and the main cargo box 3. The cargo box floor, left side panel, right side panel, top cover, and rear tail door form a conventional closed cargo cavity. The rear tail door is used for loading and unloading cargo, completing basic cargo storage and rain and dust protection. The extended cargo area 4 is formed by the main cargo box 3 extending forward and crossing over the cab body 2, making the previously idle and unusable cab space more usable. The upper space is converted into a cargo area, achieving an increase in cargo volume without lengthening or widening the chassis. The main cargo box 3 and the extended cargo area 4 are connected, allowing goods to be freely placed and moved between them. The extended cargo area 4 can load general freight bulk goods, rather than just storing tools and miscellaneous items. Unlike the independent and enclosed rear storage box on the top of the cab 2, this forward-extending cargo box structure can limit the overall cargo box's external outline to within the limits of the vehicle's overall length and height as announced, ensuring that it does not exceed the length or height limits and completing the expansion while complying with regulations, thus avoiding vehicle over-limit.

[0026] Please see the appendix Figure 1 and attached Figure 3 A safety gap is reserved between the floor of the extended cargo area 4 and the top surface of the cab body 2, so that the two do not come into contact or interfere with each other.

[0027] Specifically, when the vehicle is in motion, it will experience bumps, frame deformation, and relative vibration displacement between the cab body 2 and the cargo box. If the floor of the extended cargo area 4 is directly pressed on the top surface of the cab body 2, the two will rub and collide under bumpy conditions, causing the sheet metal on the top surface of the cab body 2 to dent and peel off, and also damaging the floor of the extended cargo area 4. By leaving a safety gap between the extended cargo area 4 and the cab body 2, the two will not come into contact at all, eliminating the risk of mutual collision and friction, and protecting the structure of the cab body 2 and the cargo box.

[0028] Please see the appendix Figure 3 and attached Figure 4 A partition 6 can be detached at the connection between the main cargo compartment 3 and the extended cargo area 4, and mounting strips 7 are installed on both the upper and lower sides of the partition 6.

[0029] Specifically, by selectively installing a partition 6 between the main cargo compartment 3 and the extended cargo area 4, the interior of the cargo box is divided into two independent chambers, achieving spatial zoning to accommodate different cargo storage needs. At the same time, it prevents a large amount of cargo from flowing forward into the extended cargo area 4 from the main cargo compartment 3, reducing the squeezing and impact of cargo on the front end of the extended compartment and protecting the structure of the extended cargo area 4. The mounting strip 7 can be made of rubber or other elastic materials so that it can deform under appropriate pressure and thus be inserted into the subsequent slot. Example

[0030] Please see the appendix Figure 5 The main cargo compartment 3 and the extended cargo area 4 are connected as a whole without partitions 6.

[0031] Specifically, by not installing a partition 6 between the main cargo compartment 3 and the extended cargo area 4, the main cargo compartment 3 and the extended cargo area 4 can be connected, and goods can be freely placed between the two areas, thus incorporating the space above the driver's seat into the effective cargo volume.

[0032] Please see the appendix Figure 3 -Appendix Figure 5 The main cargo compartment 3 and the extended cargo area 4 are an integrated whole, unlike the independent storage boxes that are added later and separated from the main cargo compartment 3.

[0033] Specifically, by integrating the main cargo box 3 and the extended cargo area 4 into a single body, the load can be distributed and transferred to the rear frame of the main cargo box 3. Compared with the separate bodies that are spliced ​​and added later, it can reduce the risk of vibration, deformation and cracking of the front extension, adapt to the bumpy conditions of truck driving, and at the same time, the integrated body reduces splicing seams and the overall airtightness of the body can protect the goods inside from rain and dust.

[0034] Please see the appendix Figure 4 The interior of the extended cargo area 4 is provided with a slot 5 and an installation slot 8, with the inner wall of the slot 5 set on the outer wall of the installation strip 7.

[0035] Specifically, by Figure 4 It is known that the interior of the extended cargo area 4 has multiple slots 5 and mounting slots 8, and the slots 5 and mounting slots 8 correspond to each other, which facilitates the adjustment of the position of the partition door components inside the extended cargo area 4. The slots 5 provide lateral limiting for the mounting strip 7, providing a positioning reference for the partition door components. The extended cargo area 4 also has slots 5 and mounting slots 8 on its lateral side, which allows the disassembled partition door components to be placed horizontally inside the extended cargo area 4. The subsequent limiting components then limit the placement of the partition door components, eliminating the need for additional storage components for the partition door components.

[0036] Please see the appendix Figure 4 -Appendix Figure 8 The partition 6 has a limiting groove 10 inside and an installation mechanism 9 inside. The installation mechanism 9 includes a T-shaped rod 91. The outer wall of the T-shaped rod 91 is located inside the partition 6. A transmission rod 92 is rotatably connected to the outer wall of the T-shaped rod 91. A trapezoidal block 93 is installed on the outer wall of the transmission rod 92. The outer walls of the trapezoidal block 93 and the transmission rod 92 are slidably connected inside the partition 6. A ball bearing 94 is provided on the outer wall of the trapezoidal block 93. A movable frame 95 is installed on the outer wall of the ball bearing 94. A spring 96 is installed between the movable frame 95 and the partition 6. The outer wall of the movable frame 95 is slidably connected inside the partition 6. The side of the movable frame 95 away from the partition 6 is inserted into the inner wall of the installation groove 8. Two limiting blocks 97 are provided on the outer wall of the T-shaped rod 91. The two limiting blocks 97 are located on the upper and lower sides of the T-shaped rod 91, respectively. The outer contour dimension of the lower limiting block 97 is larger than that of the upper limiting block 97. The outer wall of the limiting block 97 can be inserted into the inner wall of the limiting groove 10.

[0037] Specifically, the T-shaped rod 91 facilitates the transmission of the transmission rod 92. The T-shaped rod 91 is rotatable inside the transmission rod 92, allowing for rotation as needed for convenient subsequent operation. The ball bearing 94, installed inside the movable frame 95, rotates freely and engages with the inclined surface of the trapezoidal block 93, reducing frictional resistance during transmission. The movable frame 95 consists of a U-shaped frame and a short rod. The U-shaped frame facilitates the engagement with the ball bearing 94 to receive transmission from the trapezoidal block 93, unaffected by the transmission rod 92. The short rod, penetrating the interior of the partition 6 and inserted into the inner wall of the mounting groove 8, locks the partition 6. The spring 96, with appropriate elasticity, not only facilitates operation but also provides suitable locking and limiting force. Figure 6 and Figure 7The surface of the partition 6 is provided with a notch, which allows the T-shaped rod 91 to move to its limit and be flush with the surface of the partition 6. The connection between the limiting groove 10 and the notch is provided with an opening, corresponding to the limiting blocks 97 on both sides and arranged laterally. Since the lower limiting block 97 is larger than the upper limiting block 97, under the action of gravity, the limiting blocks 97 on both sides are vertical and do not contact the lateral notch opening. Therefore, they are not affected by external forces and slide into the limiting groove 10, thus preventing the T-shaped rod 91 from moving too far into the partition 6 and causing the moving frame 95 to slide out of the mounting groove 8. The T-shaped rod 91 can be actively operated. Rotating it causes the limiting blocks 97 on both sides to be horizontal, and pushing the T-shaped rod 91 causes the limiting blocks 97 to be inserted into the inner wall of the limiting groove 10 through the notch opening on the surface of the partition 6. This allows the outer wall of the movable frame 95 to slide completely out of the inner wall of the mounting groove 8. At this time, the T-shaped rod 91 can be rotated to make the limiting blocks 97 vertical in the inner wall of the limiting groove 10. Under the elastic thrust of the spring 96 and the transmission stress between the ball 94 and the trapezoidal block 93, the limiting blocks 97 abut against the inner wall of the limiting groove 10, and the T-shaped rod 91 can be released for other operations without the operator having to keep pressing the T-shaped rod 91.

[0038] Please see the appendix Figure 1 -Appendix Figure 8 A method for expanding the cargo box structure of a van that extends through the cab, for use in a van cargo box structure that extends through the cab, the expansion method includes the following steps: S1. Extend the main cargo box 3 towards the cab body 2, thereby crossing the cab body 2 and setting up an extended cargo area 4. At the same time, a safety gap is reserved between the bottom plate of the extended cargo area 4 and the top surface of the cab body 2, so that the two do not contact or interfere with each other. S2. Set the extended cargo area 4 and the main cargo box 3 as an integrated box, so that the internal space of the extended cargo area 4 and the internal space of the main cargo box 3 are directly connected to obtain a complete large-volume through cargo space. S3. When a large loading space needs to be fully connected, the partition 6 is not installed. The extended cargo area 4 and the main cargo box 3 are fully connected internally. Goods can be freely placed between the extended cargo area 4 and the main cargo box 3, and the cargo volume can be expanded directly by utilizing the area above the cab. S4. When it is necessary to partition the cargo box to isolate the extended cargo area 4 from the main cargo box 3, execute the partition 6 assembly and locking process: Align the mounting strips 7 on the upper and lower sides of the partition 6 with the slots 5 at the connection position of the compartment, and insert the partition 6 into the connection between the main cargo compartment 3 and the extended cargo area 4. At this time, pushing the T-shaped rod 91 drives the transmission rod 92 to move horizontally, the transmission rod 92 drives the trapezoidal block 93 to slide, and the trapezoidal block 93 pushes the moving frame 95 to move inward against the elastic force of the spring 96 through the ball bearing 94; After the partition 6 is inserted into place, the T-shaped rod 91 is released. Through the elastic force of the spring 96, the moving frame 95 is pushed out and inserted into the mounting slot 8 of the compartment, thus locking the partition 6. The partition 6 separates the extended cargo area 4 and the main cargo compartment 3 into two independent cargo chambers for use in separate areas. S5. When it is necessary to restore the through-through expansion state, rotate the T-shaped rod 91 so that the position of the limiting block 97 corresponds to the outer opening of the limiting groove 10. At this time, push the T-shaped rod 91 to drive the transmission rod 92 to move into the partition 6. Through the trapezoidal block 93, drive the ball 94 and the moving frame 95 to move towards the partition 6, thereby releasing the lock of the partition 6. Directly remove the partition 6, and restore the extended cargo area 4 and the main cargo box 3 to the extended cargo state of mutual connection.

[0039] Workflow: Without installing partition 6, the main cargo box 3 and the extended cargo area 4 are connected to form a whole to expand the internal volume of the cargo box. At the same time, by using the main cargo box 3 and the extended cargo area 4 as an integrated body, the overall outer contour of the main cargo box 3 and the extended cargo area 4 is strictly controlled within the total length and total height limits stipulated in the vehicle announcement and road traffic regulations, so that the vehicle does not exceed the length and height limits. When it is necessary to separate the two compartments for cargo loading, open the door panel of the main cargo compartment 3, and the operator enters the main cargo compartment 3. Holding the partition 6, first press the T-shaped rod 91 to move the transmission rod 92 and the trapezoidal block 93. Using the inclined surface of the trapezoidal block 93, push the ball bearing 94 and the moving frame 95 towards the partition 6, overcoming the elastic force of the spring 96 to deform. At this time, the moving frame 95 extends out to one side of the partition 6 and also moves back into the partition 6. At this time, the T-shaped rod 91 can be rotated to change the position of the limiting block 97 from vertical to horizontal, corresponding to the outer opening of the limiting groove 10 inside the partition 6. Then push the T-shaped rod 91 to continue moving, inserting the limiting block 97 into the limiting groove 10. Then rotate it in the opposite direction to change the position of the limiting block 97 back to vertical. At this time, release the T-shaped rod 91. Under the elastic thrust of the spring 96, the limiting block 97... 7. Press against the inner wall of the limiting groove 10, so that the movable frame 95 is inside the partition 6, while the outer wall of the T-shaped rod 91 is in the inner recess of the surface of the partition 6. Along the slot 5 set at the connection between the extended cargo area 4 and the main cargo box 3, the mounting strips 7 on the upper and lower sides of the partition 6 are locked into the corresponding slots 5, thus initially limiting the partition 6. At this time, the outer wall of the movable frame 95 also corresponds to the mounting groove 8. Simply rotate the T-shaped rod 91 so that the limiting block 97 slides out through the outer opening of the limiting groove 10 under the push of the spring 96, so that the spring 96 can transmit the movable frame 95, so that the movable frame 95 is inserted into the interior of the mounting groove 8. The partition 6 is locked by the movable frames 95 on both sides. Multiple slots 5 and mounting grooves 8 are opened inside the extended cargo area 4 to adjust the position of the partition 6 inside the extended cargo area 4.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cargo box structure for a van with a through-type cargo box above the cab, comprising a vehicle body (1), characterized in that, The upper side of the vehicle body (1) is provided with a cab body (2) and a main cargo box (3). The main cargo box (3) includes a cargo box floor, a left side panel, a right side panel, a top cover and a rear tail door. The main cargo box (3) extends forward across the area above the cab body (2) and is provided with an extended cargo area (4). The extended cargo area (4) is connected to the main cargo box (3).

2. The cargo box structure of a van with a through-type expansion above the cab according to claim 1, characterized in that, A safety gap is reserved between the bottom plate of the extended cargo area (4) and the top surface of the cab body (2), so that the two do not come into contact or interfere with each other.

3. The cargo box structure of a van with a through-type expansion above the cab as described in claim 1, characterized in that, A partition (6) can be detached at the connection between the main cargo compartment (3) and the extended cargo area (4), and mounting strips (7) are installed on both the upper and lower sides of the partition (6).

4. The cargo box structure of a van with a through-type expansion above the cab according to claim 1, characterized in that, The main cargo compartment (3) and the extended cargo area (4) are connected as a whole without partitions (6).

5. The cargo box structure of a van with a through-type expansion above the cab according to claim 1, characterized in that, The main cargo compartment (3) and the extended cargo area (4) are an integrated whole compartment, which is different from the independent storage box that is added later and separated from the main cargo compartment (3).

6. The cargo box structure of a van with a through-type expansion above the cab according to claim 1, characterized in that, The extended cargo area (4) is provided with a slot (5) and an installation slot (8) respectively. The inner wall of the slot (5) is set on the outer wall of the installation strip (7).

7. The cargo box structure of a van with a through-type expansion above the cab according to claim 3, characterized in that, The partition (6) has a limiting groove (10) inside. The partition (6) is provided with an installation mechanism (9). The installation mechanism (9) includes a T-shaped rod (91). The outer wall of the T-shaped rod (91) is located inside the partition (6). The outer wall of the T-shaped rod (91) is rotatably connected to a transmission rod (92). The outer wall of the transmission rod (92) is equipped with a trapezoidal block (93). The outer walls of the trapezoidal block (93) and the transmission rod (92) are slidably connected inside the partition (6).

8. The cargo box structure of a van with a through-type expansion above the cab according to claim 7, characterized in that, The outer wall of the trapezoidal block (93) is provided with a ball bearing (94), and a movable frame (95) is installed on the outer wall of the ball bearing (94). A spring (96) is installed between the movable frame (95) and the partition (6). The outer wall of the movable frame (95) is slidably connected to the inside of the partition (6), and the side of the movable frame (95) away from the partition (6) is inserted into the inner wall of the mounting groove (8).

9. The cargo box structure of a van with a through-type expansion above the cab according to claim 7, characterized in that, The outer wall of the T-shaped rod (91) is provided with two limiting blocks (97), and the two limiting blocks (97) are located on the upper and lower sides of the T-shaped rod (91) respectively. The outer contour dimension of the lower limiting block (97) is larger than that of the upper limiting block (97). The outer wall of the limiting block (97) can be inserted into the inner wall of the limiting groove (10).

10. A method for expanding the cargo box structure of a van with a through-type cab, characterized in that, For a van cargo box structure with through-flow expansion above the cab as described in any one of claims 1-9, the expansion method includes the following steps: S1. Extend the main cargo box (3) as a whole towards the cab body (2) to cross the cab body (2) and set up an extended cargo area (4). At the same time, leave a safe gap between the bottom plate of the extended cargo area (4) and the top surface of the cab body (2) so that the two do not contact or interfere with each other. S2. The extended cargo area (4) and the main cargo box (3) are set as an integrated box, so that the internal space of the extended cargo area (4) and the internal space of the main cargo box (3) are directly connected to obtain a complete large-volume through cargo space. S3. When a large loading space needs to be fully connected, the partition (6) is not installed. The extended cargo area (4) and the main cargo box (3) are fully connected internally. Goods can be freely placed between the extended cargo area (4) and the main cargo box (3). The cargo volume can be expanded directly by utilizing the area above the cab. S4. When it is necessary to partition the cargo box to isolate the extended cargo area (4) from the main cargo box (3), the partition (6) assembly and locking process is executed: Align the mounting strips (7) on the upper and lower sides of the partition (6) with the slots (5) at the connection position of the compartment, and install the partition (6) into the connection between the main cargo compartment (3) and the extended cargo area (4); At this time, pushing the T-shaped rod (91) drives the transmission rod (92) to translate, the transmission rod (92) drives the trapezoidal block (93) to slide, and the trapezoidal block (93) pushes the moving frame (95) to move inward against the elastic force of the spring (96) through the ball (94); After the partition (6) is inserted into place, the T-shaped rod (91) is released. Through the elastic force of the spring (96), the moving frame (95) is pushed out and inserted into the mounting slot (8) of the compartment, thus locking the partition (6). The partition (6) separates the extended cargo area (4) and the main cargo compartment (3) into two independent cargo chambers for use in separate areas. S5. When it is necessary to restore the through-and-expanded state, rotate the T-shaped rod (91) so that the position of the limiting block (97) corresponds to the outer opening of the limiting groove (10). At this time, push the T-shaped rod (91) to drive the transmission rod (92) to move into the interior of the partition (6). Through the trapezoidal block (93), drive the ball (94) and the moving frame (95) to move towards the partition (6), thereby releasing the lock of the partition (6), directly removing the partition (6), and restoring the extended cargo area (4) and the main cargo box (3) to the extended cargo state of mutual communication.

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