A vehicle rocker panel screw connection structure

Abstract

This utility model discloses a flow drill screw connection structure for vehicle door sill components, relating to the field of flow drill screw connection technology for vehicle door sill components. It includes a vehicle connection surface with a positioning groove at the center of the connection. The insertion end of the positioning groove has a guiding angle, and a positioning sleeve is inserted into the positioning groove. A fastening sleeve has threads on its inner wall, and several limiting rings are fixedly installed on its outer wall, with several limiting grooves at its lower end. A hot-melt bonding layer is fitted onto the outer wall of the fastening sleeve and has an interference fit with it. This utility model solves the problem of easy breakage during welding when the thin-walled door sill component body is too thin by using layered hot-melt filling and double welding grooves to disperse stress. It meets the stable connection requirements of thin door sill components and solves the problem of stress concentration due to insufficient wall thickness and fatigue crack propagation under vibration conditions when using existing hot-melt drill screws to weld thin-walled vehicle door sill components, which easily leads to interface breakage.

Description

Technical Field

[0001] This utility model relates to the field of flow drill screw connection technology for vehicle door sill parts, specifically a flow drill screw connection structure for vehicle door sill parts. Background Technology

[0002] Vehicle door sills are core structural components located below the doors and running along the side of the vehicle body. They are typically made of stamped steel sheets, aluminum alloys, or thin-walled composite materials in a single piece and serve multiple functions. As a key component for side protection, they enhance vehicle rigidity, disperse collision impact, seal against dust, protect chassis components, and provide a precise positioning reference for door closure. They are essential structural components for ensuring driving safety and vehicle stability, and are widely compatible with various passenger and commercial vehicles. They are usually connected to the vehicle using flow drill screws via thermoforming. For example, the utility model patent with announcement number CN222746419U discloses an FDS hot melt drill screw, which includes a screw body, a screw head, and a screw cap. The five-pointed star design of the screw cap can more stably cooperate with the screwdriver bit to smoothly drill the FDS hot melt drill screw into the board. At the same time, no waste material flies out when the screw is drilled into the board, and it will not break due to the screw tilting. The full triangular streamlined design of the free end of the screw body allows the free end of the screw to drill into the board first, which plays a pre-positioning role. The annular groove design under the screw head allows the board to be turned up in the opposite direction of the screw drilling during the screw drilling process, which can be absorbed and covered by the groove space under the screw head. However, when using this type of hot-melt drill screw to weld thin-walled vehicle door sill parts, the insufficient wall thickness leads to stress concentration, and fatigue crack propagation under vibration conditions can easily cause the interface to break. Furthermore, the lack of a hot-melt connection layer in the sealing design allows moisture to easily penetrate the interface, leading to corrosion. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a flow drill screw connection structure for vehicle door sill parts. This solves the technical problems of stress concentration due to insufficient wall thickness and fatigue crack propagation under vibration conditions when welding thin-walled vehicle door sill parts using existing devices, which can easily lead to interface breakage. Furthermore, the lack of a heat-fusion bonding layer and sealing design allows moisture to easily penetrate the interface, causing corrosion.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A flow drill screw connection structure for vehicle door sill components includes: The vehicle connection surface has a positioning groove at the center of the connection, and the insertion end of the positioning groove has a guide angle. A positioning sleeve is inserted into the positioning groove. The fastening sleeve has threads on its inner wall, and several limiting rings are fixedly installed on the outer wall surface of the fastening sleeve, and several limiting grooves are opened at the lower end. A hot-melt bonding layer is fitted onto the outer wall of the fastening sleeve and is interference-fitted with the fastening sleeve; The thin-walled threshold body has a positioning tilt at its connection and is fitted onto the outer wall surface of the hot-melt bonding layer. An expansion screw has its outer wall connected to a fastening sleeve by a thread, and a clamping head is fixedly installed on its upper end face. A top block is fixedly installed on the lower wall face of the clamping head.

[0005] Preferably, the positioning sleeve has a stepped rotating groove inside, and a rotating rod is fixedly installed on the lower wall of the fastening sleeve. The rotating rod is rotatably adapted to the stepped rotating groove, and an annular limiting block is fixedly installed on the outer wall of the rotating rod. The annular limiting block abuts and limits the movement of the stepped rotating groove.

[0006] Preferably, the connection end of the positioning sleeve and the fastening sleeve is provided with a positioning chamfer, and the guide angle, the positioning chamfer and several limiting grooves together form a positioning welding groove.

[0007] Preferably, the connecting end of the top block is provided with a clamping tilt angle, the positioning tilt angle and the clamping tilt angle are arranged opposite to each other, and a welding locking groove is formed between the two.

[0008] Preferably, the hot-melt bonding layer includes a welding layer and a locking layer. The welding layer is fixedly installed on the lower wall of the locking layer, and a locking ring adapted to the clamping angle is fixedly provided on the upper wall of the locking layer.

[0009] Preferably, the welding temperature of the welding layer is higher than that of the locking layer.

[0010] Preferably, the plurality of limiting rings are evenly distributed along the axial direction of the fastening sleeve, and the plurality of limiting grooves are evenly distributed along the circumferential direction of the fastening sleeve.

[0011] Beneficial effects This utility model provides a flow drill screw connection structure for vehicle door sill components, which has the following advantages: By using layered hot melt filling and double welding grooves to disperse stress, the problem of easy breakage during welding when the thin-walled door sill is too thin is solved. This adapts to the stable connection requirements of thin door sills and solves the problem that when using hot melt drill screws to weld thin-walled vehicle door sills, stress concentration is caused by insufficient wall thickness, and fatigue crack propagation under vibration conditions can easily lead to interface breakage. By combining a guide positioning structure, double welding locking, and threaded fastening, the system achieves precise positioning, high-strength fixing, and sealing between the door sill and the vehicle connection surface. This solves the problem of existing hot-melt drill screws used to weld thin-walled vehicle door sills without a hot-melt connection layer, which allows moisture to easily penetrate the interface and cause corrosion. Attached Figure Description

[0012] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the hot-melt bonding layer structure of this utility model; Figure 4 This is a schematic diagram of the positioning sleeve structure of this utility model; Figure 5 This is a schematic diagram of the fastening sleeve structure of this utility model.

[0013] In the diagram: 1. Vehicle connection surface; 2. Positioning groove; 3. Guide angle; 4. Positioning sleeve; 5. Fastening sleeve; 6. Limiting ring; 7. Limiting groove; 8. Thin-walled sill body; 9. Positioning angle; 10. Expansion screw; 11. Clamping head; 12. Top block; 13. Stepped rotating groove; 14. Rotating rod; 15. Annular limiting block; 16. Positioning chamfer; 17. Positioning welding groove; 18. Pressing angle; 19. Welding locking groove; 20. Welding layer; 21. Locking layer; 22. Locking ring. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] Please see Figures 1-5 A flow drill screw connection structure for vehicle door sill components, comprising: The vehicle connection surface 1 has a positioning groove 2 at the center of the connection, and the insertion end of the positioning groove 2 has a guide angle 3. The positioning groove 2 is fitted with a positioning sleeve 4. The fastening sleeve 5 has threads on its inner wall, and several limiting rings 6 are fixedly installed on the outer wall surface of the fastening sleeve 5, and several limiting grooves 7 are opened at the lower end. A hot-melt bonding layer is fitted onto the outer wall of the fastening sleeve 5 and is interference-fitted with the fastening sleeve 5; The thin-walled threshold body 8 has a positioning tilt angle 9 at its connection and is sleeved on the outer wall surface of the hot melt connection layer. The expansion screw 10 has its outer wall connected to the fastening sleeve 5 by a thread, and a clamping head 11 is fixedly installed on its upper end face. A top block 12 is fixedly installed on the lower wall face of the clamping head 11.

[0016] In use, the vehicle connection surface 1 provides the installation reference and load-bearing support for the entire connection structure; the positioning groove 2 provides the insertion and positioning space for the positioning sleeve 4, ensuring accurate installation; the guide angle 3 guides the positioning sleeve 4 to smoothly insert into the positioning groove 2, while simultaneously guiding the molten material after hot melting; the positioning sleeve 4 and the positioning groove 2 are inserted and fitted together to achieve the pre-positioning of the fastening sleeve 5; the fastening sleeve 5, through the threaded engagement with the expansion screw 10, transmits the fastening force and provides an installation carrier for the hot-melt connection layer; several limiting rings 6 enhance the axial limiting of the fastening sleeve 5 and the hot-melt connection layer, preventing relative slippage; several limiting grooves 7 participate in the enclosure to form the positioning welding groove 17. The hot-melt bonding layer 20 contains the molten material; the hot-melt bonding layer fills the welding groove after hot melting, realizing the fixed connection between the vehicle connection surface 1 and the thin-walled door sill body 8; the thin-walled door sill body 8 is the core component of the vehicle door sill, and is fixed to the vehicle connection surface 1 through the connection structure; the positioning tilt angle 9 and the pressing tilt angle 18 cooperate to form the welding locking groove 19, which is adapted to the locking layer 21; the expansion screw 10 drives the top block 12 to press down through thread engagement, providing fastening and expansion locking force; the clamping head 11 facilitates tool clamping and drives the expansion screw 10 to rotate; when the top block 12 presses down, it squeezes the locking layer 21, causing it to hot melt and fill the welding locking groove 19.

[0017] Please see Figure 5 The positioning sleeve 4 has a stepped rotating groove 13 inside. The lower wall of the fastening sleeve 5 is fixedly installed with a rotating rod 14. The rotating rod 14 is adapted to rotate with the stepped rotating groove 13. The outer wall of the rotating rod 14 is fixedly installed with an annular limiting block 15. The annular limiting block 15 abuts against the stepped surface of the stepped rotating groove 13 for limiting.

[0018] In use, the stepped rotating groove 13 provides the rotating rod 14 with rotation space and a stepped limiting surface; the rotating rod 14 realizes the relative rotation of the fastening sleeve 5 and the positioning sleeve 4, and adapts to the thread engagement action of the expansion screw 10; the annular limiting block 15 abuts against the stepped surface of the stepped rotating groove 13, restricts the axial displacement of the fastening sleeve 5, and prevents it from dislodging from the positioning sleeve 4.

[0019] Please see Figure 5 The positioning sleeve 4 and the fastening sleeve 5 are connected by a positioning chamfer 16. The guide angle 3, the positioning chamfer 16 and several limiting grooves 7 together form a positioning welding groove 17.

[0020] In use, the positioning chamfer 16, together with the guide angle 3 and the limiting groove 7, forms the positioning welding groove 17; the positioning welding groove 17 accommodates the welded layer 20 after heat fusion, and the positioning sleeve 4, the fastening sleeve 5 and the vehicle connection surface 1 are welded and fixed by the filling of molten material, which enhances the connection sealing and structural strength. When the molten material cools down, the rotational freedom of the fastening sleeve 5 is restricted, and the subsequent installation of the expansion screw 10 can be carried out.

[0021] Please see Figure 2The top block 12 has a clamping tilt angle 18 at its connecting end, and the positioning tilt angle 9 is set opposite to the clamping tilt angle 18, and a welding locking groove 19 is formed between the two.

[0022] In use, the pressing angle 18 and the positioning angle 9 cooperate to form a welding locking groove 19; when the expansion screw 10 is screwed in, the locking layer 21 and the locking ring 22 are melted, and the pressing angle 18 of the top block 12 presses the locking ring 22 onto the positioning angle 9, and together with the thin-walled sill body 8, they are melted and locked.

[0023] Please see Figure 2 The hot-melt bonding layer includes a welding layer 20 and a locking layer 21. The welding layer 20 is fixedly installed on the lower wall of the locking layer 21, and a locking ring 22 adapted to the clamping angle 18 is fixedly provided on the upper wall of the locking layer 21.

[0024] In use, the welding layer 20 is filled into the positioning welding groove 17 after being hot-melted, so as to achieve welding and fixing of the lower structure; the locking layer 21 is filled into the welding locking groove 19 after being hot-melted, so as to achieve locking and fixing of the upper structure; the locking ring 22 is adapted to the pressing angle 18, which enhances the fit between the locking layer 21 and the top block 12 and improves the locking effect.

[0025] Please see Figure 3 The welding temperature of the material of the welding layer 20 is higher than that of the material of the locking layer 21. During use, the difference in welding temperature between the welding layer 20 and the locking layer 21 ensures that the locking layer 21 melts along with the welding layer 20 when it melts into the positioning welding groove 17, thus completely fixing the positioning sleeve 4 and the fastening sleeve 5 in the positioning groove 2. After cooling, when screwing in the expansion screw 10, the temperature can be adjusted to the point where the locking layer 21 melts, ensuring that the fastening sleeve 5 is more stable under the fixation of the welding layer 20.

[0026] Please see Figure 5 Several limiting rings 6 are evenly distributed along the axial direction of the fastening sleeve 5, and several limiting grooves 7 are evenly distributed along the circumferential direction of the fastening sleeve 5. In use, the several limiting rings 6 are evenly distributed along the axial direction to enhance the axial engagement force between the fastening sleeve 5 and the hot melt connection layer and prevent relative displacement; the several limiting grooves 7 are evenly distributed around the circumference to ensure that the circumferential molten material filling of the positioning welding groove 17 is uniform, thereby improving the symmetry and connection strength of the welding structure.

[0027] Example 1: In this example, by using layered hot melt filling and double weld grooves to disperse stress, the problem of easy weld breakage when the thin-walled sill piece is too thin is solved, thus meeting the stable connection requirements of thin sill pieces.

[0028] Specifically, the fastening sleeve 5 with the hot melt connection layer is first aligned with the positioning sleeve 4 to the positioning groove 2 of the vehicle connection surface 1, and then smoothly inserted with the help of the guide angle 3 to complete the pre-positioning. At this time, the guide angle 3, the positioning chamfer 16 of the positioning sleeve 4 and the limiting groove 7 of the fastening sleeve 5 form a positioning welding groove 17, and then the thin-walled sill body 8 is sleeved on the outer wall of the locking ring 22.

[0029] Start the hot-melt equipment and first raise the temperature to the welding temperature of the locking layer 21, then gradually raise it to the welding temperature of the welding layer 20 (the welding temperature of the material of the welding layer 20 is higher). Then the rotating part of the equipment drives the fastening sleeve 5 to rotate around the positioning sleeve 4, so that the welding layer 20 is fully filled into the positioning welding groove 17 after hot melting. Several limiting rings 6 are embedded in the welding layer 20 and the locking layer 21. The thin-walled sill body 8 and the locking ring 22 are initially attached to each other, increasing the strength of the connection and preventing the thin-walled sill body 8 from breaking due to local stress concentration.

[0030] After cooling, stress is released, increasing the stability between the thin-walled sill body 8 and the locking layer 21. Then, the hot melt equipment is restarted, and the temperature is adjusted to the melting point of the locking layer 21. The hot melt equipment screws the expansion screw 10 into the clamping head 11. The clamping angle 18 of the top block 12 squeezes the locking layer 21. The molten locking ring 22 is pressed into the welding locking groove 19. The expansion of the fastening sleeve 5 further improves the connection stability, avoiding damage to the thin sill body throughout the process.

[0031] Example 2: In this example, the precise positioning, high-strength fixing and sealing of the door sill and the vehicle connection surface are achieved through the coordinated use of the guide positioning structure, double welding locking and thread fastening, adapting to the connection requirements under complex working conditions.

[0032] Specifically, during installation, the guide angle 3 of the positioning groove 2 cooperates with the positioning chamfer 16 of the positioning sleeve 4 to guide the positioning sleeve 4 to be accurately inserted into the positioning groove 2, ensuring a unified installation reference. The annular limiting block 15 prevents the fastening sleeve 5 from axially disengaging, ensuring positioning accuracy. The thin-walled sill body 8 is fitted over the hot-melt connection layer, and its positioning angle 9 is precisely aligned with the pressing angle 18 of the top block 12, forming a closed welding locking groove 19.

[0033] During the hot-melt stage, heating is performed according to a temperature gradient, first melting the locking layer 21, then melting the welding layer 20. The welding layer 20 fills the positioning welding groove 17, achieving welding and fixing of the vehicle connection surface 1, positioning sleeve 4, and fastening sleeve 5; the locking layer 21 and locking ring 22 fill the welding locking groove 19, achieving locking and fixing of the fastening sleeve 5 and the thin-walled sill body 8. The double welding not only improves the connection strength but also forms a sealing barrier to prevent moisture penetration. Several circumferentially evenly distributed limiting grooves 7 ensure uniform filling of the welding layer 20, and several axially distributed limiting rings 6 enhance the engagement between the hot-melt connection layer and the fastening sleeve 5. Finally, the expansion bolt 10 is screwed in, and the thread tightening force, combined with the hot-melt locking force, forms a double fixing of "welding + thread," significantly improving the vibration resistance and tensile strength of the connection structure.

[0034] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flow drill screw connection structure for vehicle door sill components, characterized in that, include: The vehicle connection surface (1) has a positioning groove (2) at the center of the connection. The insertion end of the positioning groove (2) has a guide angle (3). A positioning sleeve (4) is inserted into the positioning groove (2). The fastening sleeve (5) has threads on its inner wall, and several limiting rings (6) are fixedly installed on the outer wall surface of the fastening sleeve (5), and several limiting grooves (7) are opened at the lower end. The hot-melt bonding layer is fitted onto the outer wall of the fastening sleeve (5) and is interference-fitted with the fastening sleeve (5); The thin-walled threshold body (8) has a positioning tilt angle (9) at its connection and is sleeved on the outer wall surface of the hot melt connection layer; The expansion screw (10) has its outer wall connected to the fastening sleeve (5) by a thread, and a clamping head (11) is fixedly installed on its upper end face. A top block (12) is fixedly installed on the lower wall face of the clamping head (11).

2. The flow drill screw connection structure for a vehicle door sill as described in claim 1, characterized in that, The positioning sleeve (4) has a stepped rotating groove (13) inside. A rotating rod (14) is fixedly installed on the lower wall of the fastening sleeve (5). The rotating rod (14) is adapted to rotate with the stepped rotating groove (13). An annular limiting block (15) is fixedly installed on the outer wall of the rotating rod (14). The annular limiting block (15) abuts against the stepped surface of the stepped rotating groove (13) for limitation.

3. The flow drill screw connection structure for a vehicle door sill as described in claim 1, characterized in that, The positioning sleeve (4) and the fastening sleeve (5) are connected by a positioning chamfer (16), and the guide angle (3), the positioning chamfer (16) and several limiting grooves (7) together form a positioning welding groove (17).

4. The flow drill screw connection structure for a vehicle door sill as described in claim 1, characterized in that, The top block (12) has a clamping tilt angle (18) at the connecting end. The positioning tilt angle (9) is opposite to the clamping tilt angle (18), and a welding locking groove (19) is formed between them.

5. The flow drill screw connection structure for a vehicle door sill as described in claim 4, characterized in that, The hot-melt bonding layer includes a welding layer (20) and a locking layer (21). The welding layer (20) is fixedly installed on the lower wall of the locking layer (21), and a locking ring (22) adapted to the pressing angle (18) is fixedly provided on the upper wall of the locking layer (21).

6. The flow drill screw connection structure for a vehicle door sill as described in claim 5, characterized in that, The welding temperature of the material of the welding layer (20) is higher than that of the material of the locking layer (21).

7. The flow drill screw connection structure for a vehicle door sill as described in claim 1, characterized in that, The limiting rings (6) are evenly distributed along the axial direction of the fastening sleeve (5), and the limiting grooves (7) are evenly distributed along the circumferential direction of the fastening sleeve (5).

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