Mounting and sealing structure and method for storage box of car trunk

Abstract

The invention discloses a mounting and sealing structure and method for a storage box of an automobile trunk, and the structure comprises a storage box mounting groove defined by a rear floor panel assembly and a rear coaming assembly, and a storage box fixed in the storage box mounting groove. The storage box is characterized in that the storage box is fixed to the top groove face of the storage box installation groove through metal inserts and bolt and nut mechanisms which are arranged on the periphery of the top of the storage box at intervals, and an inner-outer double-row sealing foam structure is arranged between the storage box and the stepped installation groove face of the storage box installation groove. And a single-row sealing foam structure is arranged between the storage box and the plane mounting groove surface of the storage box mounting groove. Installation parts do not need to be additionally arranged, the stepped installation groove face of the storage box is made of inner and outer double-row EPDM sealing foam, the compression ratio exceeds 50%, the plane installation groove face is made of single-row sealing foam, connector sealing foam is additionally arranged at the connector position, the problems that the sheet metal step is poor, the foam length is not accurately controlled and the like are effectively solved, and the hidden danger that water and dust enter is completely eradicated.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a sealing structure and method for installing a car trunk storage box. Background Technology

[0002] In the development of the automotive industry, especially after new energy vehicles became the mainstream trend, reducing vehicle weight to improve range, optimizing cost control, and increasing the commonality of parts have become core demands in automotive R&D. As a key component of the automotive storage system, the trunk storage box's structural design, installation method, and sealing performance directly affect the vehicle's storage space utilization, manufacturing costs, load-bearing capacity, and reliability. Therefore, the optimization and upgrading of related technologies have received considerable attention.

[0003] Currently, there are various solutions for the installation and sealing structure of car trunk storage boxes, but all of them have obvious defects and shortcomings, making it difficult to simultaneously meet the comprehensive requirements of high load-bearing capacity, lightweight, low cost, easy assembly, and strong sealing.

[0004] One existing technical solution adds four mounting plates to the vehicle body to provide mounting surfaces and mounting points for the storage box. The upper surface of the storage box is fixed to the mounting plates of the vehicle body with bolts and adhesive. At the same time, two support rods are added to the crossbeam at the bottom of the vehicle body and bolted to the side of the storage box to enhance modal strength and durability. However, this solution has several problems: First, it requires approximately six additional specialized parts for the vehicle body, resulting in a large number of parts and poor integration, which not only increases the weight of the vehicle body but also raises manufacturing costs. Second, the bolt installation positions are located on the top and bottom of the vehicle body, which is not conducive to final assembly and after-sales replacement, significantly increasing installation time. Third, the storage box body is in direct contact with the bolt fastening surface of the vehicle body mounting plate without a metal transition structure. Long-term stress can easily lead to aging and cracking at the bolt fastening points, affecting load-bearing capacity and durability. Fourth, the sealing design at the bolt mounting holes is not considered. After tightening the bolts, the bolt flange face will compress the plastic contact surface, causing deformation, and the mounting holes are prone to displacement. When wading through water, water can easily enter the vehicle through the threads and gaps in the mounting surface, forming a water ingress channel. Fifth, the sealing method uses adhesive, which covers a large area. It is difficult to apply the adhesive accurately manually, requiring specialized adhesive application equipment, increasing industrial investment. Furthermore, during after-sales maintenance, manual adhesive application cannot guarantee uniformity, consistency, and continuity, easily leading to problems such as water and dust ingress.

[0005] Another existing technical solution involves adding a guide groove to the trunk storage box and an additional mounting plate to the vehicle body. The storage box is then secured to the vehicle body with bolts to compress and seal foam, with V-shaped joints at the foam connections. However, this solution also has significant drawbacks: Firstly, the additional mounting plate is welded to the vehicle body and requires adhesive sealing, increasing welding points and adhesive usage, leading to longer manufacturing time, increased manufacturing complexity, and no significant cost advantage. Secondly, the mounting plate is a panel-type part with relatively weak structural strength, which reduces the load-bearing capacity and durability of the storage box. Increasing the panel thickness or adding a beam structure to improve strength would increase manufacturing steps and vehicle weight. Furthermore, this solution also suffers from the problem of direct contact and fastening between the storage box and the vehicle body mounting plate. There are risks of aging and cracking, as well as water tightness issues at the bolt mounting holes. Furthermore, the limited number and uneven distribution of bolt fastening points between the storage box and the vehicle mounting plate lead to uneven stress on the sealing foam, causing some foam to fail to adhere tightly to the vehicle mounting plate surface, affecting the sealing effect. Additionally, the V-shaped structure of the foam joint is affected by the precision of foam length control and the stability of the bonding path, posing a risk to sealing reliability. Moreover, this sealing structure is only suitable for complete sheet metal mounting surfaces, failing to consider the step differences and gaps that exist on mounting surfaces composed of multiple sheet metal pieces in actual manufacturing, thus limiting its applicability.

[0006] Furthermore, traditional steel storage boxes are typically composed of three steel plates, resulting in significant weight and requiring numerous welding points and adhesive application. This not only increases vehicle weight, impacting the range of new energy vehicles, but also raises component costs, manufacturing complexity, and industrial investment. Additionally, existing storage box structures offer limited scalability for different powertrains within the same vehicle model (such as range-extended electric vehicles versus pure electric vehicles), often necessitating modifications to sealing and connection methods, or the addition of specialized components to the vehicle body. This leads to increased industrial investment and reduced component commonality.

[0007] In summary, the existing installation and sealing structures of automotive trunk storage boxes have room for improvement in terms of lightweighting, integration, load-bearing capacity, sealing reliability, ease of assembly, cost control, and expandability. There is an urgent need for a new structural design that can solve the above-mentioned technical problems. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a sealing structure and method for installing a car trunk storage box that is reliable in sealing, easy to assemble, lightweight and integrated.

[0009] To achieve this objective, the present invention provides a sealing structure for a car trunk storage box, comprising a storage box mounting groove formed by the rear floor panel assembly and the rear bulkhead assembly, and a storage box fixed within the storage box mounting groove. The storage box is characterized in that it is fixed to the top groove surface of the storage box mounting groove by metal inserts and bolt and nut mechanisms spaced around its top perimeter; a double-row sealing foam structure is provided between the storage box and the stepped mounting groove surface of the storage box mounting groove; and a single-row sealing foam structure is provided between the storage box and the flat mounting groove surface of the storage box mounting groove.

[0010] Furthermore, the top of the storage box is provided with a plurality of metal insert fixing holes spaced apart around the perimeter. The metal inserts are coaxially fixedly connected in the metal insert fixing holes. The bolt and nut mechanism includes welding nuts fixed at intervals along the bottom groove surface of the storage box mounting groove and fastening bolts that coaxially pass through the metal inserts and are threadedly connected to the welding nuts.

[0011] Furthermore, the metal insert includes a metal sleeve coaxially disposed within the metal insert fixing hole and a gear coaxially and fixedly connected to the outer surface of the metal sleeve, which is integral with the metal sleeve. The gear teeth are fixedly connected to the hole wall of the metal insert fixing hole.

[0012] Furthermore, the rear floor panel assembly includes a rear floor panel, a rear floor front connecting plate that is internally overlapped and fixed to the left and right sides of the rear floor panel and located below the rear floor panel, and two rear floor rear connecting plates whose front ends are respectively overlapped and fixed to the rear ends of the left and right rear floor front connecting plates. The left and right sides of the rear panel assembly are respectively overlapped and fixed to the inner sides of the left and right rear floor rear connecting plates. The stepped mounting groove surface includes the overlapping surface between the rear floor panel and the rear floor front connecting plate, the overlapping surface between the rear floor front connecting plate and the rear floor rear connecting plate, and the overlapping surface between the rear floor rear connecting plate and the rear panel assembly.

[0013] Furthermore, the top flange of the storage box and the top plate of the storage box form a sealing foam mounting groove arranged around the top of the storage box. A double-row sealing foam structure is provided at each of the four corners of the sealing foam mounting groove. The single-row sealing foam structure is arranged in the sealing foam mounting groove except at the four corners.

[0014] Furthermore, the inner and outer double-row sealing foam structure includes an outer sealing foam located outside the sealing foam mounting groove and an inner sealing foam located inside the sealing foam mounting groove. The outer surface of the inner sealing foam is attached and fixed to the inner surface of the outer sealing foam to form the inner and outer double-row sealing foam structure. The compression ratio of the inner sealing foam is greater than that of the outer sealing foam.

[0015] Furthermore, the single-row sealing foam structure includes a single-row sealing foam located outside the sealing foam mounting groove. The single-row sealing foam and the outer sealing foam are an integral structure. A joint sealing foam located inside the sealing foam mounting groove is fixed at the joint of the single-row sealing foam. The outer surface of the joint sealing foam is attached and fixed to the inner surface of the single-row sealing foam.

[0016] Furthermore, the bottom of the storage box is provided with multiple spring nuts that can be fixed to the body sheet metal with bolts.

[0017] Furthermore, the present invention also provides a method for installing and sealing a car trunk storage box based on a sealing structure for a car trunk storage box, comprising: assembling the rear panel assembly and the rear floor panel assembly to form a storage box installation groove; inserting sealing foam between the storage box and the top groove surface of the storage box installation groove to form an inner and outer double-row sealing foam structure and a single-row sealing foam structure; and inserting fastening bolts through metal inserts into the welding nuts on the bottom groove surface of the storage box installation groove.

[0018] Furthermore, the method of inserting sealing foam between the storage box and the top groove surface of the storage box mounting groove to form an inner and outer double-row sealing foam structure and a single-row sealing foam structure includes: inserting a single-row sealing foam arranged around the top of the storage box into the sealing foam mounting groove formed by the top flange of the storage box and the top plate of the storage box, forming the single-row sealing foam structure; and inserting sealing foam with an outer surface that fits against the inner surface of the single-row sealing foam and a thickness greater than that of the inner surface of the single-row sealing foam at the four corners of the sealing foam mounting groove, forming the inner and outer double-row sealing foam structure.

[0019] The beneficial effects of this invention are as follows: The stepped mounting groove uses double-row EPDM sealing foam with a compression rate exceeding 50%, while the flat mounting groove uses single-row sealing foam. Joint sealing foam is added at the joints, effectively solving problems such as sheet metal step differences and inaccurate foam length control, and eliminating the risk of water and dust ingress. The storage box is fixed by a metal insert with double-row gears and a bolt and nut mechanism. The maximum pull-out force of the metal insert reaches 671N, preventing cracking from direct fastening of the plastic parts. It is fixed to the high-strength steel / thermoformed rear floor frame, significantly improving load-bearing capacity, modal strength, and durability. It possesses significant advantages in lightweighting and low cost. The integrated injection-molded plastic storage box replaces the traditional steel storage box, reducing weight by more than 50%, and eliminating the need for additional vehicle-specific... Using mounting components reduces the investment in welding points, adhesive application, and adhesive application equipment, thus lowering manufacturing time and industrial investment. Bolt mounting points are evenly distributed around the sealing foam (with gaps of 150~200mm), eliminating the need for complex processes. The storage box is removable, and after-sales replacement does not require specialized adhesive application equipment, significantly improving maintenance efficiency. It boasts outstanding expandability, adapting to different power types of the same vehicle model. Only the Z-axis dimension of the storage box needs to be adjusted to avoid key components, without changing the sealing and overlapping methods, increasing the commonality rate of vehicle body parts and reducing differentiated industrial investment. Storage space is maximized, making full use of the space under the rear floor to achieve optimal X and Y-axis dimensions of the storage box. The storage box has smooth sides and a reasonable arrangement of internal reinforcing ribs, balancing storage capacity and visual experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments disclosed in this invention, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0021] Figure 1 This is a perspective view of the assembly of the rear floor panel assembly and the rear bulkhead assembly in this invention;

[0022] Figure 2 This is a top view of the storage box mounting slot in this invention;

[0023] Figure 3 This is a top view of the rear floor panel assembly in this invention;

[0024] Figure 4 This is a perspective view of the storage box in this invention;

[0025] Figure 5 This is a bottom view of the storage box in this invention;

[0026] Figure 6 This is a perspective view of the metal insert in this invention;

[0027] Figure 7This is a top view of the metal insert installed in the metal insert fixing hole in this invention;

[0028] Figure 8 This is an axial cross-sectional view of the metal insert installed in the metal insert fixing hole in this invention;

[0029] Figure 9 for Figure 5 Structural diagram of the central sealing foam;

[0030] Figure 10 This is a top view of the storage box installed in the storage box mounting slot in this invention;

[0031] Figure 11 for Figure 10 Sectional view of AA;

[0032] Figure 12 for Figure 10 BB section view;

[0033] Figure 13 for Figure 10 CC section view;

[0034] Figure 14 for Figure 10 DD section view;

[0035] Figure 15 This is an enlarged view of the adhesive application area of ​​the rear floor panel assembly in this invention;

[0036] Figure 16 This is an enlarged view of the connection between the rear floor panel assembly and the rear enclosure assembly in this invention;

[0037] Among them, 1—rear floor panel assembly (1.1—rear floor panel, 1.2—rear floor front connecting plate, 1.3—rear floor rear connecting plate), 2—rear bulkhead assembly, 3—storage box mounting groove, 4—storage box, 5—metal insert (5.1—metal sleeve, 5.2—gear), 6—welding nut, 7—fastening bolt, 8—sealing foam mounting groove, 9—outer sealing foam, 10—inner sealing foam, 11—single row sealing foam, 12—joint sealing foam, 13—stepped mounting groove surface, 14—flat mounting groove surface, 15—sealant, 16—spring nut. Detailed Implementation

[0038] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. 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. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0039] Example 1

[0040] A sealing structure for installing a car trunk storage box is provided in this embodiment. This car trunk storage box installation sealing structure is suitable for both new energy and traditional fuel vehicles. The specific structure is as follows:

[0041] like Figure 1 As shown in Figure 16, the rear floor panel assembly 1 is composed of a rear floor panel 1.1, two front connecting plates 1.2 and two rear connecting plates 1.3 overlapping each other. The rear floor panel 1.1 is made of DC03 material with a thickness of 0.65mm. The front connecting plates 1.2 are made of D340DP high-strength steel with a thickness of 1.2mm. They are fixed to the lower left and right sides of the rear floor panel 1.1 on the inner side to support the rear seats and absorb road impacts. The rear connecting plates 1.3 are made of DC06 material with a thickness of 0.65mm. The front end overlaps the rear end of the front connecting plates 1.2. By adjusting its geometric dimensions, it can be adapted to different rear suspension requirements on the same platform. The rear panel assembly 2 is made of DC03 material with a thickness of 0.7mm. It is fixed to the inner side of the rear floor connecting plate 1.3 on both sides, and together with the rear floor panel assembly 1, it forms the storage box mounting groove 3. The joint is fixed by spot welding and sealed with 6mm diameter coating adhesive 15. A gap of more than 10mm in the X direction is reserved between the rear floor panel 1.1 and the rear floor connecting plate 1.3 to avoid assembly interference.

[0042] like Figure 4As shown in Figure 5, the storage box 4 is a one-piece injection-molded structure made of reinforced polypropylene. The bottom features thickened reinforcing ribs, while the back and mounting surfaces have cross-shaped reinforcing plates that are 30% thinner than the main body, ensuring both load-bearing strength and lightweight design. Twelve metal insert fixing holes are evenly distributed around the top of the storage box 4, with a gap controlled between 150 and 180 mm. Each hole coaxially fixes one metal insert 5. The metal insert 5 includes a metal sleeve 5.1 and a one-piece molded double-row gear 5.2. The metal sleeve 5.1 is made of Q235 steel with an inner diameter of 8 mm and an outer diameter of 12 mm. The teeth of the gear 5.2 are embedded in the hole wall of the plastic body of the storage box 4. The maximum pull-out force of a single metal insert 5 can reach 671 N, effectively preventing it from falling off due to vibration.

[0043] like Figure 2 , Figure 9 As shown in Figure 14, the top flange of the storage box 4 forms a sealing foam mounting groove 8 with a width of 10-18mm and a depth of 5.5mm with the top plate. A single row of sealing foam 11, made of EPDM material, is arranged on the flat mounting groove surface 14. This foam is 8mm wide and 12mm high, and is an integral structure with the outer sealing foam 9. The stepped mounting groove surface 13 includes the overlapping surfaces of the rear floor panel and the front connecting plate, the front connecting plate and the rear connecting plate, the rear connecting plate and the rear enclosure plate, and the four corners of the sealing foam mounting groove 8. Double rows of sealing foam are arranged at these locations. The outer sealing foam 9 has the same specifications as the single row of sealing foam 11. The inner sealing foam 10 is 8mm wide and 14mm high, and its compression rate is controlled at 70%, 20% higher than the outer layer (this compression difference can be achieved through local protrusions in the storage box or by setting the thickness of the inner and outer sealing foams). A joint sealing foam 12, with the same specifications as the inner sealing foam 10, is fixed inside the joint of the single row of sealing foam 11 to ensure reliable joint sealing. The bolt and nut mechanism includes M6 welding nuts 6 and fastening bolts 7. The welding nuts 6 are fixed at intervals to the bottom surface of the storage box mounting slot 3, behind the longitudinal beams, transverse beams, and rear panel assembly at preset positions. The fastening bolts 7 coaxially pass through the metal inserts 5 and are threadedly connected to the welding nuts 6. The bolt flange faces are tightly fitted to the surface of the metal inserts 5, eliminating the risk of deformation and displacement. The bottom of the storage box 4 also has five spring nuts 16, made of standard Q235 steel. The M6 ​​spring nuts at the bottom of the storage box 4 can fix the exterior trim panel and rear bumper, improving the overall structural integration and avoiding the need for additional dedicated parts to fix the exterior trim panel and rear bumper.

[0044] Example 2

[0045] Based on the installation sealing structure described in Embodiment 1, this embodiment provides a specific installation sealing method, including the following steps:

[0046] Component pretreatment: The rear floor panel assembly 1, rear bulkhead assembly 2, and storage box 4 are prepared according to specifications. The overlapping joints of the connecting plates of the rear floor panel assembly 1 are pre-coated with adhesive 15 with a diameter controlled at 6mm. The metal insert 5 is pre-installed into the metal insert fixing hole of the storage box 4 through injection molding to ensure that the gear 5.2 teeth are fully engaged with the plastic body without loosening. The outer sealing foam 9, inner sealing foam 10, single-row sealing foam 11, and joint sealing foam 12 are all made of adhesive-backed EPDM foam, which is pre-cut according to the dimensions. The single-row sealing foam 11 is cut into sections according to the top perimeter of the storage box, and the length error of each section is ≤±2mm.

[0047] Assemble the basic assembly: First, overlap the front connecting plate 1.2 of the rear floor and the rear connecting plate 1.3 of the rear floor with the rear floor panel 1.1. Fix the overlap with spot welding with a weld spacing of 50mm to ensure that the X-direction gap between the rear floor panel 1.1 and the rear connecting plate 1.3 of the rear floor is ≥10mm and the Z-direction height deviation is ≤1.5mm after the adhesive 15 has solidified. Then, push the rear panel assembly 2 along the horizontal X direction to overlap with the inner side of the rear connecting plate 1.3 of the rear floor. Fix it with spot welding by a welding robot to form a complete storage box mounting groove 3. Apply adhesive 15 to the overlap for sealing and let it stand for 24 hours to allow the adhesive to completely solidify.

[0048] Install the sealing foam: First, attach a single row of sealing foam 11 into the sealing foam installation groove 8, continuously arranging it around the top of the storage box. The outer side of the foam should be attached to the outer wall of the installation groove. The adhesive pressure should be controlled at 0.3MPa to ensure no air bubbles or curling edges. Then, attach the inner sealing foam 10 at the four corners of the sealing foam installation groove 8 and at the corresponding positions on the stepped installation groove surface 13, so that its outer surface is tightly attached to the inner side of the single row of sealing foam 11, forming a double-row sealing foam structure. Finally, attach the joint sealing foam 12 to the inner side of the joint of the single row of sealing foam 11 to cover the joint gap. Press for 30 seconds after attaching to fix it.

[0049] Storage box positioning and fixing: Place the storage box 4 into the storage box mounting slot 3, calibrate the position using the positioning pin, and ensure that the top flange of the storage box 4 fits snugly against the top surface of the mounting slot, and that the sealing foam is in complete contact with the sheet metal mounting surface; use M6 fastening bolts 7 to evenly tighten around the sealing foam in a clockwise direction, and control the tightening torque of each bolt to 10±5 N·m, ensuring that the bolt flange face is tightly fitted to the surface of the metal insert 5 without any looseness; the M6 ​​spring nut at the bottom of the storage box 4 is used to fix the exterior trim panel and rear bumper, improving the integration of the overall structure and avoiding the need for additional special parts to fix the exterior trim panel and rear bumper.

[0050] Inspection and Adjustment: After tightening, test the sealing performance by flushing with water at a pressure of 0.2 MPa for 30 minutes, and observe whether water or dust enters the vehicle. Test the load-bearing capacity by evenly placing a 200 kg weight in the storage box and letting it stand for 48 hours. Check that the storage box is not deformed, the bolts are not loose, and the pull-out force of the metal inserts remains ≥600 N. If there is poor sealing or installation deviation, adjust the bolt tightening torque or add sealing foam until the performance requirements are met.

[0051] In summary, Example 1 constructs a highly integrated and adaptable automotive trunk storage box installation and sealing structure. The rear floor panel assembly 1 and the rear bulkhead assembly 2 enclose a mounting groove 3. The storage box 4 adopts an injection-molded one-piece design, secured with a metal insert 5 with double-row gears and a bolt and nut mechanism. A single-row + inner and outer double-row EPDM foam sealing system is designed to address sheet metal step differences and joints. A spring-loaded nut 16 is added at the bottom to secure the exterior trim bottom guard plate and rear bumper. No additional special mounting parts are required for the vehicle body, achieving a balance between lightweight structure and strength. Example 2 provides a matching installation method, from component pretreatment and basic assembly assembly to precise foam pasting, storage box positioning and fastening, and performance testing. The process is standardized and easy to operate, ensuring the consistency and reliability of the structural assembly. The synergy between the two technologies achieves significant technical benefits: In terms of sealing, the double-row foam (compression rate exceeding 50%, with the inner side reaching 70%) effectively solves problems such as sheet metal step differences and inaccurate foam length control, preventing water and dust ingress; in terms of load-bearing capacity, the maximum pull-out force of the metal inserts reaches 671N, which, combined with the high-strength steel / thermoformed rear floor frame, prevents cracking from direct fastening of plastic parts, significantly improving modal strength and durability; in terms of lightweighting, the plastic storage box replaces the traditional steel structure, reducing weight by more than 50%, reducing welding points and the use of adhesive, and lowering manufacturing costs and industrial investment; assembly and after-sales service are convenient and efficient, with evenly distributed bolt installation points (gap 150~200mm), eliminating the need for special adhesive application equipment, and allowing for easy disassembly and maintenance; and the scalability is outstanding, as only the Z-axis dimension of the storage box needs to be adjusted to adapt to different power models, improving the parts commonality rate and meeting the needs of new energy vehicles for weight reduction, range improvement, and platform-based production.

[0052] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0053] When using the terms “comprising,” “having,” and “including” as described in this specification, there may also be another part or other parts, and the terms used are generally singular but may also be plural.

[0054] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A sealing structure for installing a storage box in a car trunk, comprising a storage box mounting groove (3) formed by a rear floor panel assembly (1) and a rear bulkhead assembly (2), and a storage box (4) fixed within the storage box mounting groove (3), characterized in that: The storage box (4) is fixed to the top groove surface of the storage box mounting groove (3) by metal inserts (5) arranged at intervals around its top and bolt and nut mechanism. A double-row sealing foam structure is provided between the storage box (4) and the stepped mounting groove surface (13) of the storage box mounting groove (3), and a single-row sealing foam structure is provided between the storage box (4) and the flat mounting groove surface (14) of the storage box mounting groove (3).

2. The sealing structure for installing a car trunk storage box as described in claim 1, characterized in that: The top of the storage box (4) is provided with a plurality of metal insert fixing holes spaced apart. The metal insert (5) is coaxially fixedly connected in the metal insert fixing holes. The bolt and nut mechanism includes a welding nut (6) fixed at intervals along the bottom groove surface of the storage box mounting groove (3) and a fastening bolt (7) coaxially passing through the metal insert (5) and threadedly connected to the welding nut (6).

3. The sealing structure for installing a car trunk storage box as described in claim 2, characterized in that: The metal insert (5) includes a metal sleeve (5.1) coaxially disposed in the metal insert fixing hole and a gear (5.2) coaxially and fixedly connected to the outer surface of the metal sleeve (5.1) and integral with the metal sleeve (5.1). The teeth of the gear (5.2) are fixedly connected to the hole wall of the metal insert fixing hole.

4. The sealing structure for installing a car trunk storage box as described in claim 1, characterized in that: The rear floor panel assembly (1) includes a rear floor panel (1.1), a rear floor front connecting plate (1.2) which is internally overlapped and fixed to the left and right sides of the rear floor panel (1.1) and located below the rear floor panel (1.1), and two rear floor rear connecting plates (1.3) whose front ends are respectively overlapped and fixed to the rear ends of the left and right rear floor front connecting plates (1.2). The left and right sides of the rear panel assembly (2) are respectively overlapped and fixed to the inner sides of the left and right rear floor rear connecting plates (1.3). The stepped mounting groove surface (13) includes the overlapping surface of the rear floor panel (1.1) and the rear floor front connecting plate (1.2), the overlapping surface of the rear floor front connecting plate (1.2) and the rear floor rear connecting plate (1.3), and the overlapping surface of the rear floor rear connecting plate (1.3) and the rear panel assembly (2).

5. The sealing structure for installing a car trunk storage box as described in claim 4, characterized in that: The top flange of the storage box (4) and the top plate of the storage box (4) form a sealing foam mounting groove (8) arranged around the top of the storage box (4). A double-row sealing foam structure is provided at each of the four corners of the sealing foam mounting groove (8). A single-row sealing foam structure is arranged in the sealing foam mounting groove (8) except at its four corners.

6. The sealing structure for installing a car trunk storage box as described in claim 5, characterized in that: The inner and outer double-row sealing foam structure includes an outer sealing foam (9) located outside the sealing foam mounting groove (8) and an inner sealing foam (10) located inside the sealing foam mounting groove (8). The outer surface of the inner sealing foam (10) is attached and fixed to the inner surface of the outer sealing foam (9) to form the inner and outer double-row sealing foam structure. The compression ratio of the inner sealing foam (10) is greater than that of the outer sealing foam (9).

7. The sealing structure for installing a car trunk storage box as described in claim 6, characterized in that: The single-row sealing foam structure includes a single-row sealing foam (11) located outside the sealing foam mounting groove (8). The single-row sealing foam (11) and the outer sealing foam (9) are an integral structure. A joint sealing foam (12) located inside the sealing foam mounting groove (8) is fixed at the joint of the single-row sealing foam (11). The outer surface of the joint sealing foam (12) is attached and fixed to the inner surface of the single-row sealing foam (11).

8. The sealing structure for installing a car trunk storage box as described in claim 1, characterized in that: The bottom of the storage box (4) is provided with multiple spring nuts (16) that can be fixed to the vehicle body exterior trim panel and rear bumper by bolts.

9. A method for installing and sealing a car trunk storage box based on the sealing structure described in any one of claims 1-8, characterized in that: It includes: The rear panel assembly (2) and the rear floor panel assembly (1) are assembled to form a storage box mounting groove (3). Sealing foam is inserted between the storage box (4) and the top groove surface of the storage box mounting groove (3) to form an inner and outer double row sealing foam structure and a single row sealing foam structure. The fastening bolt (7) is passed through the metal insert (5) and driven into the welding nut (6) on the bottom groove surface of the storage box mounting groove (3).

10. The method for installing and sealing a car trunk storage box as described in claim 9, characterized in that: The method of inserting sealing foam between the storage box (4) and the top groove surface of the storage box mounting groove (3) to form an inner and outer double-row sealing foam structure and a single-row sealing foam structure includes: inserting a single-row sealing foam (11) arranged around the top of the storage box into the sealing foam mounting groove (8) formed by the top flange of the storage box (4) and the top plate of the storage box (4) to form the single-row sealing foam structure; inserting sealing foam (10) with an outer surface that fits the inner surface of the single-row sealing foam (11) and a thickness greater than that of the inner surface of the single-row sealing foam (11) at the four corners of the sealing foam mounting groove (8) to form the inner and outer double-row sealing foam structure.

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