An all-plastic drive structure for adjusting automotive sheet metal gaps

Abstract

This invention provides an all-plastic drive structure for adjusting the gap between automotive sheet metal parts. It includes an adjusting flange nut with a first inner hole. A cavity for accommodating a drive element is formed in the middle of the first inner hole, and a space for placing the upper sheet metal is formed above the adjusting flange nut. The drive element is press-fitted into the first inner hole. The drive element has a second inner hole, through which an adjusting bolt passes and interferes with the drive element. When the adjusting bolt rotates, it drives the drive element to rise or fall. An adjusting body is mounted on the outside of the adjusting flange nut and connected to the lower sheet metal. This invention achieves automatic adjustment and connection between sheet metal parts by inserting the drive element into the adjusting flange nut to create interference. When the adjusting flange nut is raised to the desired height, the adjusting bolt continues to tighten, and the internal limiting boss of the drive element deforms axially, completing the locking without additional operation.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, and in particular to the field of axial adjustment components, specifically an all-plastic drive structure for adjusting the gap of automotive sheet metal. Background Technology

[0002] With the rapid development of the automotive industry, the requirements for component assembly are increasing. During the assembly process, the accumulation of manufacturing and assembly tolerances can lead to unsatisfactory assembly positioning and final matching results. To solve this problem, axial tolerance adjustment devices are typically used to control the axial position of the adjustment components and eliminate deviations.

[0003] Currently, most axial tolerance adjustment devices on the market use metal parts or combinations of metal and plastic, utilizing the friction between bolts and friction units to achieve axial tolerance adjustment. However, these devices have some problems in practical use. Plastic ones require the addition of separate friction elements. By using a combination of complex plastic parts and metal friction elements, outward deformation is used to provide frictional interference force. However, the high manufacturing cost of metal parts molds, the assembly requirements, and the increased time and cost, along with the increased mold maintenance costs, all contribute to reduced production efficiency and make them unsuitable for current requirements for lightweight and rapid production.

[0004] An axial tolerance adjustment device is disclosed in the prior art (patent number CN221195684U). The device includes a snap-fit ​​unit, a base component, an ejection assembly, a hollow flange, and a hexagonal nut. The snap-fit ​​unit includes a sleeve that fits with the outside of the base component, a first anti-detachment mechanism on the sleeve for fixing the base component, and a second anti-detachment mechanism connected to the lower side of the sleeve. There is a snap-fit ​​gap between the second anti-detachment mechanism and the sleeve. The second anti-detachment mechanism has a snap-fit ​​groove on the snap-fit ​​gap side, and the hexagonal nut is snapped into the snap-fit ​​groove. By using the snap-fit ​​groove opened inward on the snap-fit ​​gap side of the second anti-detachment mechanism, the hexagonal nut is snapped in place and fixed, making it easier to drive in the bolt; and after assembly, the hexagonal nut will not loosen or fall off due to vibration, ensuring the stability of the adjustment device. This effectively solves the technical problems in the background art, such as the nut being unable to be fixed by welding, which easily loosens and falls off, causing the regulator to fail and its service life to be shortened. However, the disclosed friction unit 5 has a similar function to the simple drive element provided by this technical solution, but other structures are not disclosed.

[0005] Existing technology discloses a tolerance adjustment device for automobiles, patent number CN222910497U, which includes a spiral assembly, a snap-fit ​​sleeve, and a friction plate. The spiral assembly includes a base plate, a bolt, a snap-fit ​​protrusion, and a nut. The snap-fit ​​sleeve includes a cylindrical body, an elastic insert, a slot, a first snap-fit ​​block, and a second snap-fit ​​block. The second snap-fit ​​block is disposed on the inner wall of the cylindrical body and includes a guide surface and a top surface. Compared with the prior art, this utility model provides a method to position the spiral assembly by inserting the snap-fit ​​sleeve into a hole in a sheet metal part or equipment, facilitating fastener insertion and ensuring assembly efficiency. Simultaneously, the first and second snap-fit ​​blocks limit the snap-fit ​​sleeve and spiral assembly after assembly, preventing arbitrary separation and ensuring that parts are not lost during transportation. This significantly reduces the impact on functionality caused by deformation and bending of plastic parts during transportation and storage. Although the field is the same, it does not employ an interference structure but uses a threaded connection; other structural details are not disclosed.

[0006] A tolerance adjuster is disclosed in the prior art (patent number CN221299700U). This adjuster features a groove in the inner through-hole of the tolerance adjusting bolt, which passes through the flange and the stud. A threaded nylon ring is tightly fitted within the groove, and its length is less than the length of the groove. The external threads of the adjusting bolt and the tolerance adjusting bolt's screw portion have the same direction of rotation. The screw portion is integrally composed of a small-diameter screw portion and a large-diameter screw portion. The small diameter of the large-diameter screw portion is greater than the minimum inner diameter of the threaded nylon ring; the large diameter of the small-diameter screw portion is less than the minimum inner diameter of the threaded nylon ring. When the small-diameter screw portion engages with the second adjusting plate, the large-diameter screw portion is tightly fitted with the threaded nylon ring. This tolerance adjuster is highly versatile, meeting basic adjustment requirements and preventing loosening or falling off. Its simple structure and operation allow for easier and more secure installation, and it boasts low production costs and minimal manufacturing process requirements. The aforementioned technical solution utilizes a nylon ring to achieve the interference effect, serving the same purpose but with a different structure; other structural details have not been disclosed. Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an all-plastic drive structure for adjusting the gap of automotive sheet metal, so as to solve the difficulties of the prior art.

[0008] To achieve the above and other related objectives, this utility model provides an all-plastic drive structure for adjusting the gap of automotive sheet metal, comprising: Adjusting flange nut 1, wherein a first inner hole 2 is provided in the adjusting flange nut 1, a cavity for accommodating the driving element 3 is formed in the middle of the first inner hole 2, and a space for placing sheet metal is formed above the adjusting flange nut 1; The driving element 3 is installed on the first inner hole 2 by press fitting. The driving element 3 has a second inner hole 4. The adjusting bolt 5 passes through the second inner hole 4 and interferes with the driving element 3. When the adjusting bolt 5 rotates, it drives the driving element 3 to rise or fall. Adjustment body 6 is installed on the outside of adjustment flange nut 1 and connected to the lower sheet metal.

[0009] Furthermore, the adjusting flange nut 1, the driving element 3, the adjusting body 6, and the adjusting bolt 5 are all coaxially arranged.

[0010] In this technical solution, by adjusting the bolt 5 through the second inner hole 4 of the drive element 3, and the drive element 3 engaging with the first inner hole 2 of the adjusting flange nut 1, combined with the threaded connection between the adjusting body 6 and the adjusting flange nut 1, the purpose of rotating the drive element 3 and other follower components can be achieved by adjusting the bolt 5, so that the lower sheet metal connected to the adjusting body 6 can be raised to the required height. The height requirement of the adjusting flange nut 1 can be adjusted according to the height between the upper and lower sheet metal to ensure that the gap between the sheet metal meets the design requirements.

[0011] According to a preferred embodiment, the driving element 3 includes a second inner hole 4 and a limiting boss 7 formed by being disposed on the inner wall of the second inner hole 4 and extending toward the center; The inner diameter of the limiting boss 7 is smaller than the external thread diameter of the adjusting bolt 5.

[0012] In this technical solution, since the drive element 3 has a second inner hole 4 inside, and the diameter of the second inner hole 4 is smaller than the external thread diameter of the adjusting bolt 5, an interference fit is formed between the drive element 3 and the adjusting bolt 5, which is conducive to the relative static linkage between the two structural components. During use, the drive element 3 will be driven to rotate due to the interference force between the adjusting bolt 5 and the second inner hole 4. When the adjusting bolt 5 rotates, it will drive the drive element 3 to rotate. After installation, a torque is formed between them, which can effectively prevent loosening caused by driving vibration.

[0013] According to the preferred embodiment, the height of the drive element 3 is not greater than the height of the stud portion of the adjusting flange nut 1.

[0014] Furthermore, when the top of the drive element 3 is installed, it does not exceed the bottom of the nut head of the adjusting flange nut 1.

[0015] In this technical solution, the top of the drive element does not extend beyond the bottom of the nut head, ensuring that the nut head will not mechanically interfere with the upper structure under the extreme compression condition of the adjusting bolt 5, thus avoiding the risk of plastic parts breaking. According to a preferred embodiment, the driving element 3 further includes reinforcing ribs 8 integrally disposed on the outer side wall, and multiple reinforcing ribs 8 are arranged at equal intervals along the center of the driving element 3.

[0016] Furthermore, the height of the reinforcing rib 8 is consistent with the height of the driving element 3.

[0017] In this technical solution, a structure of three 120° evenly distributed reinforcing ribs 8 in a ring array is adopted. While ensuring the limiting function, it reduces the injection molding stress and achieves equal strength distribution. This prevents the drive element 3 from deforming, breaking or falling off during the adjustment of the adjusting bolt 5, thus extending its service life. It achieves mechanical performance comparable to metal structures using plastic drive elements 3, which is a major innovation in the field of sheet metal gap adjustment.

[0018] According to the preferred embodiment, the top and bottom of the limiting boss 7 are both provided with chamfers 9.

[0019] Furthermore, the limiting boss 7 is located in the middle position of the driving element 3.

[0020] In this technical solution, the top chamfer of the limiting boss 7 facilitates the smooth insertion of the adjusting bolt 5, reduces assembly resistance, and avoids thread scratches or plastic debris. The bottom chamfer can prevent the edge of the limiting boss from cracking and extend its service life. In addition, the limiting boss 7 is located in the middle position of the driving element 3. The middle position layout balances the forces on the upper and lower ends of the driving element and avoids the problem of uneven wear caused by excessive stress on one side.

[0021] According to the preferred embodiment, the chamfer 9 located at the top and bottom positions overlaps on the side closest to the center.

[0022] In this technical solution, the limiting boss 7 can avoid the existence of right-angle steps by overlapping the chamfer 9 on one side near the center of the upper and lower positions. This prevents the thread of the adjusting bolt 5 from being bitten by the edge of the limiting boss 7, thus avoiding damage and plastic debris. The overlapping chamfer forms a "V-shaped" continuous guide surface, which allows the adjusting bolt 5 to smoothly transition whether it is screwed in or out, reducing assembly resistance.

[0023] According to the preferred scheme, the height of the limiting boss 7 is not greater than the pitch of the external thread of the adjusting bolt 5.

[0024] Furthermore, when the adjusting bolt 5 rotates, the limiting boss 7 is embedded in the external thread of the adjusting bolt 5, forming a rotational linkage.

[0025] In this technical solution, the rotational linkage between the adjusting bolt 5 and the limiting boss 7 is achieved through threaded engagement, ensuring that the threaded engagement produces a self-locking effect and preventing the occurrence of spontaneous loosening. The structure achieves metal-level transmission precision on plastic parts through the principle of simulated threaded engagement, while maintaining the cost advantage of injection molding process, making it suitable for applications such as gap adjustment between automotive sheet metal parts.

[0026] According to the preferred embodiment, the outer diameter of the nut head of the adjusting flange nut 1 is larger than the outer diameter of the adjusting body 6.

[0027] Furthermore, the adjusting flange nut 1 is connected to the adjusting body 6 by a thread.

[0028] In this technical solution, on the one hand, the larger outer diameter of the nut head of the adjusting flange nut 1 can significantly increase the contact area with the upper sheet metal, reduce local pressure, and avoid sheet metal deformation or indentation; on the other hand, the large-diameter flange can also disperse stress and prevent sheet metal fatigue cracking during vehicle operation or under impact conditions.

[0029] According to the preferred embodiment, the outer bottom of the adjusting body 6 has a latch 10 extending outward.

[0030] Furthermore, there is a pair of symmetrically arranged buckles 10.

[0031] In this technical solution, the structure of the symmetrical buckle 10 allows direct pressing into the mounting hole of the lower sheet metal, shortening the assembly time. The symmetrical design enables a quick and stable connection between the lower sheet metal parts, ensuring the smoothness during the gap adjustment process. In addition, the symmetrical layout of the double buckles automatically corrects positional deviations, ensuring the concentricity of the adjustment body 6 and the sheet metal hole.

[0032] According to the preferred embodiment, the outer ends of the adjusting body 6 are provided with inserts for installing stop caps 11, and the stop caps 11 are raised to the top and then abut against the bottom of the nut head of the adjusting flange nut 1.

[0033] In this technical solution, the structure of the insert strip integrally formed on the adjusting body 6 can form a hard stop point when the stop cap 11 rises to the bottom of the nut head of the adjusting flange nut 1, preventing over-adjustment from causing overload of the plastic parts. The stop cap 11 is made of nylon material, which can protect the adjusting body 6 and avoid damage to the parts during the clearance adjustment process.

[0034] This utility model achieves automatic adjustment and connection between sheet metal parts by installing the driving element 3 into the first inner hole 2 of the adjusting flange nut 1. Since the diameter of the second inner hole 4 inside the driving element 3 is smaller than the external thread diameter of the adjusting bolt 5, the adjustment element is automatically adjusted and connected to the sheet metal parts. When the adjusting flange nut 1 is raised to the required height, the adjusting bolt 5 is tightened further, and the limiting boss 7 inside the driving element deforms axially to complete the locking, without the need for additional operation. Specifically, it includes the following aspects: 1. The overall structure is simple and easy to operate, which improves the efficiency and precision of sheet metal connection; 2. Through the design of the limiting boss 7 of the driving element, the all-plastic driving structure can achieve both height adjustment and locking function; 3. The limiting boss 7 is directly injected into the injection molded part as a friction element. The technical problem of connection and automatic height adjustment is achieved through all plastic parts. It can be used directly without the assembly process, which improves production efficiency, reduces mold maintenance costs, and thus reduces the overall cost of the product. 4. During mold forming, only the upper and lower molds need to be opened. Because there are no extra complex structures, mold space and mold manufacturing costs can be saved. The internal limiting boss drive structure can be applied to various plastic products that require internal drive or single-piece drive.

[0035] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, so as to facilitate an understanding of the features and advantages of the present invention. Attached Figure Description

[0036] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model; Figure 2 The diagram shown is a cross-sectional view of this utility model. Figure 3 The diagram shown is an enlarged three-dimensional structural schematic of the adjusting flange nut and the driving element in this utility model. Figure 4 The diagram shown is an enlarged three-dimensional structural schematic of the driving element in this utility model; Figure 5 The diagram shown is a cross-sectional view of the driving element in this invention. Figure 6 The diagram shown is an enlarged three-dimensional structural schematic of the adjusting flange nut in this utility model. Figure 7 The diagram shown is an enlarged three-dimensional structural schematic of the adjusting body in this utility model; Label Explanation 1. Adjusting flange nut; 2. First inner hole; 3. Drive element; 4. Second inner hole; 5. Adjusting bolt; 6. Adjusting body; 7. Limiting boss; 8. Reinforcing rib; 9. Chamfer; 10. Buckle; 11. Stop cap. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0038] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components shown in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0039] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0040] This utility model proposes an all-plastic drive structure for adjusting the gap between automotive sheet metal parts. It is used for adjusting and connecting sheet metal parts. This utility model does not limit the type of automotive sheet metal, but the structure of this all-plastic drive structure for adjusting the gap between automotive sheet metal parts is particularly suitable for adjusting automotive sheet metal parts.

[0041] In general, the all-plastic drive structure for adjusting automotive sheet metal gaps proposed in this utility model mainly includes an adjusting flange nut, a drive element, an adjusting body, and an adjusting bolt. See also... Figure 1 It shows the arrangement of the adjusting flange nut, driving element, adjusting body and adjusting bolt.

[0042] To achieve the goal of plastic friction elements, and to address the shortcomings of the prior art which requires additional friction elements for plastic components, complex plastic parts and metal friction elements are used to provide frictional interference force through outward deformation. However, the high cost of metal mold manufacturing, the added assembly requirements leading to increased time and costs, and the increased mold maintenance costs due to the presence of metal parts result in reduced production efficiency. This approach is unsuitable for current requirements of lightweight and rapid production. Therefore, the technical solution provided in this embodiment involves interference fitting of the driving element 3 into the first inner hole 2 of the adjusting flange nut 1. The diameter of the second inner hole 4 inside part 3 is smaller than the external thread diameter of the adjusting bolt 5. The adjusting flange nut 1 rises with the rotation of the adjusting bolt 5, realizing the purpose of automatic adjustment and connection between sheet metal parts. When the adjusting flange nut 1 is raised to the required height, the adjusting bolt 5 continues to tighten, and the internal limiting boss 7 of the drive element will deform axially to complete the locking without additional operation. In addition, the above structures are all plastic parts, and only the upper and lower molds need to be opened during mold forming. Because there are no extra complex structures, mold space and mold manufacturing costs can be saved. The internal limiting boss drive structure can be applied to various plastic products that require internal drive or single-piece drive.

[0043] As mentioned above, in the structure provided in this embodiment, the drive element 3 is interference-fitted into the adjusting flange nut 1. The top of the adjusting flange nut 1 is provided with an upper sheet metal. The adjusting flange nut 1 is installed in the adjusting body 6. The adjusting body 6 is connected to the lower sheet metal. The adjusting flange nut 1, the drive element 3, the adjusting body 6 and the adjusting bolt 5 are all coaxially arranged. In use, the adjusting bolt 5 passes through the adjusting bolt 5 to drive the drive element 3 and the adjusting flange nut 1 to lift, thereby completing the adjustment and connection between the sheet metal.

[0044] Specifically, the adjusting flange nut 1 has a first inner hole 2, and a cavity for accommodating the drive element 3 is formed in the middle of the first inner hole 2. A space for placing the upper sheet metal is formed above the adjusting flange nut 1. The adjusting flange nut 1 is installed in the adjusting body 6, which is connected to the lower sheet metal. Next, the drive element 3 is installed in the first inner hole 2 by press fitting, and a second inner hole 4 is formed inside it. The adjusting bolt 5 passes through the second inner hole 4 and interferes with the drive element 3. When the adjusting bolt 5 rotates, it drives the drive element 3 to rise or fall. By the adjusting bolt 5 passing through the second inner hole 4 of the drive element 3, the drive element 3 cooperates with the first inner hole 2 of the adjusting flange nut 1. Combined with the threaded connection between the adjusting body 6 and the adjusting flange nut 1, the purpose of rotating the drive element 3 and other follower components can be achieved by adjusting the bolt 5, so that the lower sheet metal connected to the adjusting body 6 can be raised to the required height. The height requirement of the adjusting flange nut 1 can be adjusted according to the height between the upper and lower sheet metal to ensure that the gap between the sheet metal meets the design requirements.

[0045] It should be specifically explained that the driving element 3 includes a second inner hole 4 and a limiting boss 7 formed by extending towards the center on the inner wall of the second inner hole 4. The limiting boss 7 is used to create interference with the adjusting bolt 5. The interference force is used to make the driving element 3 rotate when the adjusting bolt 5 rotates. Furthermore, the inner diameter of the limiting boss 7 is smaller than the external thread diameter of the adjusting bolt 5. Since the driving element 3 has a second inner hole 4 inside, and the diameter of the second inner hole 4 is smaller than the external thread diameter of the adjusting bolt 5, an interference fit is formed between the driving element 3 and the adjusting bolt 5. This facilitates the linkage between the two structural components due to their relative static state. During use, the driving element 3 will rotate when the adjusting bolt 5 rotates because of the interference force between the adjusting bolt 5 and the second inner hole 4. After installation, a torque is formed between them, which can effectively prevent loosening caused by driving vibration.

[0046] Furthermore, in this embodiment, the driving element 3 serves as a bridge between the adjusting bolt 5 and the adjusting flange nut 1. To ensure the interference linkage between the driving element 3 and the adjusting flange nut 1, the driving element 3 also includes reinforcing ribs 8 integrally mounted on the outer side wall with the same height as the driving element 3. Multiple reinforcing ribs 8 are arranged at equal intervals along the center of the driving element 3, forming a structure of three evenly distributed reinforcing ribs 8 at 120° in a circular array. This structure reduces injection molding stress while ensuring the limiting function, and also achieves equal strength distribution, preventing the driving element 3 from deforming, breaking, or falling off during the adjustment process of the adjusting bolt 5, thus extending its service life. This achieves mechanical performance comparable to metal structures using a plastic driving element 3, representing a major innovation in the field of sheet metal gap adjustment.

[0047] Based on this, in order to facilitate the smooth insertion of the adjusting bolt 5 into the limiting boss 7 of the drive element 3, on the one hand, the top and bottom of the limiting boss 7 are provided with chamfers 9. The top chamfer reduces assembly resistance, and the chamfer provides a more easily deformable and bolt-screwed effect, avoiding thread scratches or plastic debris. The bottom chamfer can prevent the edge of the limiting boss from cracking and extend its service life. On the other hand, the limiting boss 7 is set in the middle position of the drive element 3. The middle position layout balances the force on the upper and lower ends of the drive element and avoids the problem of uneven wear caused by excessive stress on one side.

[0048] Preferably, the chamfer 9 located at the top and bottom positions overlaps on one side near the center, which avoids the existence of right-angle steps and prevents the thread of the adjusting bolt 5 from biting the edge of the limiting boss 7, resulting in damage and plastic debris. The overlapping chamfer forms a continuous "V-shaped" guide surface, which allows the adjusting bolt 5 to smoothly transition whether it is screwed in or out, reducing assembly resistance.

[0049] In this preferred embodiment, when the adjusting bolt 5 passes through the driving element 3, it will be subjected to an interference force. The rotation of the adjusting bolt 5 drives the driving element 3 to rotate. The main driving structure is the structure of the limiting boss 7 inside the driving element 3. The height of the limiting boss 7 is not greater than the pitch of the external thread of the adjusting bolt 5. When the adjusting bolt 5 rotates, the limiting boss 7 is embedded in the external thread of the adjusting bolt 5, forming a rotational linkage. In use, the rotational linkage between the adjusting bolt 5 and the limiting boss 7 is achieved through thread engagement, ensuring that the thread engagement produces a self-locking effect and preventing the phenomenon of self-loosening. The structure achieves metal-level transmission accuracy on plastic parts through the principle of simulated thread engagement, while maintaining the cost advantage of injection molding process, making it suitable for the application scenario of adjusting the gap between automotive sheet metal parts.

[0050] Preferably, the height of the drive element 3 is not greater than the height of the stud portion of the adjusting flange nut 1, and when installed at the top, it does not exceed the bottom of the nut head of the adjusting flange nut 1. The top of the drive element 3 does not extend beyond the bottom of the nut head, ensuring that the nut head will not mechanically interfere with the upper structure under the extreme compression condition of the adjusting bolt 5, thus avoiding the risk of plastic parts breaking.

[0051] like Figure 5 As shown, the outer diameter of the nut head of the adjusting flange nut 1 is larger than the outer diameter of the adjusting body 6. On the one hand, the larger outer diameter of the nut head of the adjusting flange nut 1 can significantly increase the contact area with the upper sheet metal, reduce local pressure, and avoid sheet metal deformation or indentation. On the other hand, the large-diameter flange can also disperse stress and prevent sheet metal fatigue cracking during vehicle operation or under impact conditions. Furthermore, a pair of snap fasteners 10 extend outward from the bottom outer side of the adjusting body 6. The symmetrical structure of the snap fasteners 10 allows direct pressing into the mounting holes of the lower sheet metal, shortening the assembly time. The symmetrical design enables a quick and stable connection between the lower sheet metal parts, ensuring smoothness during the gap adjustment process. In addition, the symmetrical layout of the double snap fasteners automatically corrects positional deviations, ensuring the concentricity of the adjusting body 6 and the sheet metal holes.

[0052] Correspondingly, the outer ends of the adjusting body 6 are provided with inserts for mounting stop caps 11. After the stop caps 11 rise to the top, they abut against the bottom of the nut head of the adjusting flange nut 1. The structure of inserts integrally formed on the adjusting body 6 allows the stop caps 11 to form a hard stop point when they rise to the bottom of the nut head of the adjusting flange nut 1, preventing over-adjustment from causing overload of the plastic parts. The stop caps 11 are made of nylon, which can protect the adjusting body 6 and prevent damage to the parts during the clearance adjustment process.

[0053] When using it, the first step is to install the 3 simple drive components into the inner hole of the 2 adjusting flanges. Specifically, this includes the following steps: S1: When the adjusting bolt 5 passes through the inside of the drive element 3, the drive element 3 forms a limiting boss 7 through the second inner hole 4, and the diameter of the limiting boss 7 is smaller than the external thread diameter of the adjusting bolt 5. Due to the interference force between the adjusting bolt 5 and the limiting boss 7, the drive element 3 will rotate when the adjusting bolt 5 rotates. Since the drive element 3 and the adjusting flange nut 1 are interference fit or fixed fit with other installation structures, the adjusting flange nut 1 will also rotate and rise at this time. S2: When the adjusting flange nut 1 is raised to the required adjustment height, the adjusting bolt 5 will continue to tighten. The adjusting flange nut 1 will not continue to rise because the thickness of the internal limiting boss 7 of the drive element 3 is very thin. The edge of the limiting boss 7 has a chamfer 9 where it contacts the external thread of the adjusting bolt 5. Therefore, when the adjusting flange nut 1 is raised to the customer's sheet metal, the force of further raising is greater than the interference force of the internal limiting boss 7 of the drive element 3. At this time, the internal limiting boss 7 of the drive element 3 will deform axially and the bolt will tighten. After the bolt is tightened, the internal limiting boss 7 of the drive element 3 will stop bearing force, and the entire automatic adjustment component will complete the adjustment and connection between sheet metal.

[0054] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A drive structure for adjusting the gap of automotive sheet metal parts, characterized in that, include: Adjusting flange nut (1), the adjusting flange nut (1) has a first inner hole (2), a cavity for accommodating the driving element (3) is formed in the middle of the first inner hole (2), and a space for placing sheet metal is formed above the adjusting flange nut (1); The driving element (3) is installed on the first inner hole (2) by press fitting. The driving element (3) has a second inner hole (4). The adjusting bolt (5) passes through the second inner hole (4) and interferes with the driving element (3). When the adjusting bolt (5) rotates, it drives the driving element (3) to rise or fall. Adjustment body (6) is installed on the outside of adjustment flange nut (1) and connected to the lower sheet metal.

2. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 1, characterized in that, The driving element (3) includes a second inner hole (4) and a limiting boss (7) formed by being disposed on the inner wall of the second inner hole (4) and extending toward the center; The inner diameter of the limiting boss (7) is smaller than the external thread diameter of the adjusting bolt (5).

3. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 2, characterized in that, The height of the drive element (3) is not greater than the height of the stud portion of the adjusting flange nut (1).

4. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 3, characterized in that, The driving element (3) also includes reinforcing ribs (8) integrally disposed on the outer side wall, and multiple reinforcing ribs (8) are arranged at equal intervals in a ring along the center of the driving element (3).

5. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 4, characterized in that, The top and bottom of the limiting boss (7) are both provided with chamfers (9).

6. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 5, characterized in that, The chamfer (9) located in the upper and lower positions overlaps on one side near the center.

7. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 6, characterized in that, The height of the limiting boss (7) is not greater than the pitch of the external thread of the adjusting bolt (5).

8. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 7, characterized in that, The outer diameter of the nut head of the adjusting flange nut (1) is larger than the outer diameter of the adjusting body (6).

9. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 8, characterized in that, The adjustment body (6) has a buckle (10) extending outward from its outer bottom.

10. The all-plastic drive structure for adjusting automotive sheet metal gaps according to claim 9, characterized in that, The outer ends of the adjusting body (6) are provided with inserts for installing stop caps (11) facing upwards. After the stop caps (11) rise to the top, they abut against the bottom of the nut head of the adjusting flange nut (1).

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