Anti-abnormal-sound high-stability sliding door guide rail structure

Abstract

The invention discloses an abnormal-sound-preventing high-stability sliding door guide rail structure which comprises an upper guide rail assembly, a middle guide rail assembly and a lower guide rail assembly which are sequentially arranged in the height direction of a vehicle body, the upper guide rail assembly, the middle guide rail assembly and the lower guide rail assembly form a three-point supporting guide structure and jointly restrain the moving track of a sliding door, and the middle guide rail assembly is a core bearing component. Comprising a middle guide rail body, a plurality of middle guide rail mounting supports, pressing rivet bolts and nitrile rubber gaskets, and the middle guide rail mounting supports are arranged on the side face of the middle guide rail body. The three-point supporting and guiding structure cooperatively exerts force, the upper, middle and lower guide rail assemblies form closed-loop constraint, the middle guide rail assembly serves as a core bearing component to bear main loads, the upper and lower guide rail assemblies assist in guiding and positioning, it is ensured that the moving track of the sliding door is accurate and controllable, and component friction and collision abnormal sounds caused by track deviation are effectively avoided; and meanwhile, the parallelism error of the center line is controlled to be smaller than or equal to 0.5 mm, and the running smoothness of the sliding door is further guaranteed.

Description

Technical Field

[0001] This invention relates to the field of vehicle sliding door guide rails, and specifically to a highly stable sliding door guide rail structure that prevents abnormal noise. Background Technology

[0002] As an important body accessory of commercial vehicles, the door system's core function is to enable smooth opening and closing of the doors while ensuring the vehicle's sealing, safety, and passenger comfort. The sliding door rail, as the core load-bearing component of the sliding door system, bears the weight load, provides guidance and positioning, and constrains movement. Its structural design rationality, connection reliability, and material compatibility directly determine the overall performance of the sliding door system.

[0003] Currently, most commercial vehicle sliding door guide rails adopt the traditional structure of "guide rail body + mounting bracket + bolt fixing". The upper, middle, and lower guide rails are connected to the vehicle body sheet metal through mounting brackets, forming a three-point support guide structure. Existing commercial vehicle sliding door guide rail structures have revealed numerous technical defects during use, affecting the reliability of the sliding door system and the user experience, as follows: 1. In existing structures, the guide rail body and mounting bracket are mostly fixed by direct welding. The lack of precise positioning and protective measures during welding easily leads to problems such as weld misalignment, incomplete welding, and slag inclusion. Furthermore, welding stress concentration can easily cause deformation of the guide rail body or mounting bracket, resulting in excessive gaps between the two. Under the long-term bumpy and vibrating conditions of commercial vehicles, the connection points are prone to loosening and shaking. This causes relative displacement between the guide rail and slider, and between the mounting bracket and the vehicle body during sliding door operation, resulting in metallic collision noises. The shaking also accelerates component wear and shortens service life.

[0004] 2. Existing sliding door guide rails mostly have a hard metal-to-metal contact with the vehicle body assembly surface, without dedicated shock-absorbing and buffering components. Vibrations generated during sliding door operation and those transmitted from road bumps are directly transmitted to the vehicle body through the guide rail, causing resonance noise. Simultaneously, the hard contact leads to wear on the assembly surface, further exacerbating gaps and creating a vicious cycle of abnormal noise. While some products simply add rubber pads, improper material selection and unreasonable structural design of these pads make them prone to aging and detachment, failing to provide long-term shock absorption. Therefore, those skilled in the art have provided a highly stable sliding door guide rail structure to address the problems mentioned in the background. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a highly stable sliding door guide rail structure with noise prevention, comprising an upper guide rail assembly, a middle guide rail assembly, and a lower guide rail assembly arranged sequentially along the height of the vehicle body. These three components form a three-point support and guiding structure, jointly constraining the sliding door's running trajectory. The middle guide rail assembly is the core load-bearing component, including a middle guide rail body, a middle guide rail mounting bracket, rivet bolts, and nitrile rubber gaskets. Several middle guide rail mounting brackets are arranged on the side of the middle guide rail body and fixed by welding. After welding, the weld points are polished. The rivet bolts are pressed into preset holes in the middle guide rail mounting brackets. The nitrile rubber gaskets are sleeved on the outside of the rivet bolts, tightly fitting against the vehicle body sheet metal assembly surface. The upper and lower guide rail assemblies are fixed to the vehicle body through preset mounting points, working in conjunction with the middle guide rail assembly to achieve smooth sliding door operation.

[0006] Preferably, the middle guide rail body is integrally stamped from SUS430 stainless steel with a thickness of 1.5-2.0mm, wherein the thickness of the bearing part at the bottom of the groove is 2.0mm, the thickness of the guiding part at the bottom of the groove is 1.5mm, the middle guide rail body has a U-shaped groove structure with an opening width of 30-35mm, two parallel guide protrusions are provided at the bottom of the groove with a protrusion height of 2-3mm, and welding process grooves are pre-set on both sides of the middle guide rail body with a width of 5-8mm and a depth of 1-2mm.

[0007] Preferably, the middle guide rail mounting bracket is made of SUS430 stainless steel and stamped with a thickness of 1.8-2.0mm. It has an L-shaped structure, including a transverse connecting part and a longitudinal fixing part. The transverse connecting part is fitted with the side of the middle guide rail body, and the fitting surface is provided with anti-slip teeth with a depth of 0.3-0.5mm. The longitudinal fixing part is provided with a rivet bolt mounting hole. The diameter of the rivet bolt mounting hole is interference-fitted with the diameter of the rivet bolt rod, and the fit tolerance is 0.02-0.05mm. Several middle guide rail mounting brackets are evenly arranged along the length of the middle guide rail body, with a spacing of 150-200mm.

[0008] Preferably, the press-fit bolt is made of SUS430 stainless steel and includes a bolt head, a screw, and a threaded part. The bolt head is countersunk and is adapted to the press-fit bolt mounting hole of the longitudinal fixing part of the middle guide rail mounting bracket. The screw surface is provided with a knurled structure with a depth of 0.2-0.4mm. The threaded part adopts M8×1.25 fine thread with a length of 15-20mm. The pressing pressure of the press-fit bolt is controlled at 8-10MPa.

[0009] Preferably, the nitrile rubber gasket has a Shore hardness of 50-60HA, a ring structure, an inner hole diameter that is clearance-fitted with the diameter of the press-fit bolt thread with a clearance of 0.1-0.2mm, a thickness of 3-5mm, and a textured surface with a spacing of 2-3mm on the side of the nitrile rubber gasket that contacts the vehicle body assembly surface, and is wrapped with an EPDM protective film with a thickness of 0.1-0.2mm on the outside.

[0010] Preferably, the middle guide rail assembly further includes a welding protection component, which includes a copper plate protective pad with a thickness of 2-3mm and a pneumatic polishing machine. During welding, the copper plate protective pad is laid inside the U-shaped groove of the middle guide rail body at the corresponding weld point position. After welding, the weld point is polished with a pneumatic polishing machine at a polishing speed of 3000-4000r / min until the weld point protrusion is polished to be flush with the surface of the middle guide rail body. Preferably, the upper guide rail assembly includes an upper guide rail body, an upper guide rail mounting bracket, and a buffer pad. The upper guide rail body is made of SUS430 stainless steel with a thickness of 1.2-1.5mm. It has an arc-shaped groove structure with an arc radius of 800-1000mm. A grease storage groove with a width of 2-3mm and a depth of 1-1.5mm is provided in the groove. An elongated hole is opened inside the upper guide rail mounting bracket for fine-tuning the installation position to accommodate vehicle body assembly errors. A positioning hole is opened inside the upper guide rail mounting bracket. The buffer pad is made of EPDM rubber with a Shore hardness of 55-65HA and a thickness of 3-4mm, and is fitted onto the outside of the fixing bolt.

[0011] Preferably, the lower guide rail assembly includes a lower guide rail body, a lower guide rail mounting bracket, a buffer pad, and a limiting block. The lower guide rail body is made of SUS430 stainless steel with a thickness of 1.8mm and has a straight groove structure. The bottom of the groove is provided with drainage holes with a diameter of 5-8mm. The limiting block is made of polyurethane and is fixed to the end of the lower guide rail body by bolts. The lower guide rail mounting bracket and the middle guide rail mounting bracket have the same structure.

[0012] Preferably, the central guide rail body, central guide rail mounting bracket and press-fit bolts can be replaced with SUS304 stainless steel, the nitrile rubber gasket can be replaced with hydrogenated nitrile rubber, the welding process can be replaced with laser welding process, the welding current is 50A, the welding speed is 10mm / s, and the press-fit bolts can be made using hot press-fitting process, with the pressing temperature controlled at 150℃.

[0013] The technical effects and advantages of this invention are as follows: 1. The three-point support guide structure of this invention works together to exert force, with the upper, middle and lower guide rail components forming a closed loop constraint. The middle guide rail component, as the core load-bearing component, bears the main load, while the upper and lower guide rail components assist in guiding and positioning, ensuring that the sliding door's running trajectory is accurate and controllable, effectively avoiding abnormal noises caused by component friction and collision due to trajectory deviation. At the same time, the parallelism error of the center line is controlled within ≤0.5mm, further ensuring the smoothness of the sliding door's operation. The mounting bracket is precisely positioned by pre-set welding process grooves, and the anti-slip toothed texture ensures tight meshing of the mating surfaces without gaps. Combined with copper plate protective pads for welding protection and pneumatic polishing, the problems of weld point misalignment, incomplete welding, slag inclusion and stress deformation that are easy to occur in traditional welding are completely solved. After the weld points are ground, they are flush with the surface of the guide rail body, eliminating the abnormal noise caused by protruding weld points during operation, and eliminating the metal collision noise caused by loosening and shaking of the connection parts under long-term bumpy conditions. The U-shaped groove structure and guide protrusion design of the middle guide rail body, combined with the matching design of the upper guide rail arc groove and grease storage groove and the lower guide rail straight groove, provide a stable guiding channel for the sliding door slider. The precise filling of lithium-based grease further reduces motion friction and reduces friction noise. At the same time, the lower guide rail drainage hole design can drain accumulated water and impurities in time, avoiding abnormal noise caused by component corrosion and wear.

[0014] 2. The targeted design of the nitrile rubber gasket of this invention effectively solves the problem of hard metal contact. The Shore hardness of 50-60HA balances shock absorption and support performance. The ring structure with concave and convex texture increases the friction of the contact surface. At the same time, the 0.1-0.2mm gap ensures precise assembly. The outer EPDM protective film delays the aging and shedding of the rubber. It can block the vibration of sliding door operation and road bumps from being transmitted to the vehicle body for a long time, avoid resonance noise, form a stable shock absorption and buffer barrier, and break the vicious cycle of abnormal noise. The buffer pad is made of EPDM rubber, which works in conjunction with the nitrile rubber pad of the middle guide rail to reduce vibration transmission in all directions. At the same time, the elongated hole design of the upper guide rail mounting bracket allows for fine adjustment of the installation position to accommodate vehicle assembly errors, avoid uneven local stress and abnormal vibration noise caused by assembly deviations, and improve assembly fault tolerance and overall operational stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a structural schematic diagram of the guide rail mounting bracket in this application; Figure 3 This is a structural schematic diagram of the press-fit bolt of this application; In the diagram: 1. Upper guide rail assembly; 2. Grease reservoir; 3. Upper guide rail mounting bracket; 4. Positioning hole; 5. Oblong hole; 6. Press-fit bolt; 7. Bolt head; 8. Knurled structure; 9. Threaded part; 10. Buffer pad; 11. Middle guide rail assembly; 12. Guide protrusion; 13. Middle guide rail mounting bracket; 14. Lateral connection part; 15. Longitudinal fixing part; 16. Press-fit bolt mounting hole; 17. Nitrile rubber gasket; 18. Lower guide rail assembly; 19. Drain hole; 20. Limiting block; 21. Lower guide rail mounting bracket. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0017] Example 1 Please see Figures 1-3 This embodiment provides a high-stability sliding door guide rail structure with noise prevention, including an upper guide rail assembly 1, a middle guide rail assembly 11, and a lower guide rail assembly 18 arranged sequentially along the height of the vehicle body. The three form a three-point support and guide structure to jointly constrain the running trajectory of the sliding door. The middle guide rail assembly 11 is the core load-bearing component, including a middle guide rail body, a middle guide rail mounting bracket 13, a press-fit bolt 6, and a nitrile rubber gasket 17. The middle guide rail body is made of SUS430 stainless steel and is integrally stamped with a thickness of 1.5mm. The thickness of the load-bearing part at the bottom of the groove is 2.0mm, and the thickness of the guide part at the wall of the groove is 1.5mm. The middle guide rail body has a U-shaped groove structure with an opening width of 30mm. Two parallel guide protrusions 12 are provided at the bottom of the groove with a protrusion height of 2mm. Welding process grooves are preset on both sides of the middle guide rail body with a width of 5mm and a depth of 1mm. Several middle guide rail mounting brackets 13 are arranged on the side of the middle guide rail body and fixed by welding. After welding, the weld points are polished. The middle guide rail mounting bracket 13 is made of SUS430 stainless steel and is stamped with a thickness of 1.8mm. It has an L-shaped structure and includes a transverse connecting part 14 and a longitudinal fixing part 15. The transverse connecting part 14 fits against the side of the middle guide rail body. The fitting surface is provided with anti-slip teeth with a depth of 0.3mm. The longitudinal fixing part 15 has a rivet bolt mounting hole 16. The diameter of the rivet bolt mounting hole 16 is interference-fitted with the diameter of the rivet bolt 6 with a tolerance of 0.02mm. Several middle guide rail mounting brackets 13 are evenly arranged along the length of the middle guide rail body with a spacing of 150mm. The rivet bolt 6 is pressed into the preset hole position of the middle guide rail mounting bracket 13. The press-fit bolt 6 is made of SUS430 stainless steel and includes a bolt head 7, a screw and a threaded part 9. The bolt head 7 is countersunk and is adapted to the press-fit bolt mounting hole 16 of the longitudinal fixing part 15 of the middle guide rail mounting bracket 13. The screw surface is provided with a knurled structure 8 with a depth of 0.2mm. The threaded part 9 is an M8×1.25 fine thread with a length of 15mm. The pressing pressure of the press-fit bolt 6 is controlled at 8MPa. The nitrile rubber gasket 17 is sleeved on the outside of the press-fit bolt 6 and fits tightly with the body sheet metal assembly surface. The nitrile rubber gasket 17 has a Shore hardness of 50HA, a ring structure, and an inner hole diameter that is clearance-fitted with the screw diameter of the press-fit bolt 6 with a clearance of 0.1mm. The thickness is 3mm. The side of the nitrile rubber gasket 17 that contacts the body assembly surface is provided with a groove with a spacing of 2mm. The outside is wrapped with a 0.1mm thick EPDM protective film. The middle guide rail assembly 11 also includes a welding protection assembly, which includes a 2mm thick copper plate protective pad and a pneumatic polishing machine. During welding, the copper plate protective pad is laid inside the U-shaped groove of the middle guide rail body at the corresponding welding point position. After welding, the welding point is polished with a pneumatic polishing machine at a polishing speed of 3000r / min, and the welding point protrusion is polished until it is flush with the surface of the middle guide rail body. The middle guide rail body, the middle guide rail mounting bracket 13 and the rivet bolt 6 can be replaced with SUS304 stainless steel, the nitrile rubber gasket 17 can be replaced with hydrogenated nitrile rubber, the welding process can be replaced with laser welding process, the welding current is 50A and the welding speed is 10mm / s, the rivet bolt 6 can be made of hot pressing riveting process, and the pressing temperature is controlled at 150℃. The upper guide rail assembly 1 and the lower guide rail assembly 18 are fixed to the car body through preset installation points, and work together with the middle guide rail assembly 11 to achieve smooth operation of the sliding door. The upper guide rail assembly 1 includes an upper guide rail body, an upper guide rail mounting bracket 3, and a buffer pad 10. The upper guide rail body is made of SUS430 stainless steel with a thickness of 1.2mm. It has an arc-shaped groove structure with an arc radius of 800mm. A grease storage groove 2 with a width of 2mm and a depth of 1mm is set inside the groove. An elongated hole 5 is opened inside the upper guide rail mounting bracket 3 for fine-tuning the installation position to adapt to the assembly error of the vehicle body. The upper guide rail mounting bracket 3 has a positioning hole 4 inside. The buffer pad 10 is made of EPDM rubber with a Shore hardness of 55HA and a thickness of 3mm. It is fitted on the outside of the fixing bolt. The lower guide rail assembly 18 includes a lower guide rail body, a lower guide rail mounting bracket 21, a buffer pad 10, and a limiting block 20. The lower guide rail body is made of SUS430 stainless steel with a thickness of 1.8mm. It has a straight groove structure and a drainage hole 19 with a diameter of 5mm is set at the bottom of the groove. The limiting block 20 is made of polyurethane and is fixed to the end of the lower guide rail body with bolts. The lower guide rail mounting bracket 21 and the middle guide rail mounting bracket 13 have the same structure.

[0018] Example 2 Based on Embodiment 1, the central guide rail assembly 11 is the core load-bearing component, including the central guide rail body, central guide rail mounting bracket 13, rivet bolts 6, and nitrile rubber gaskets 17. The central guide rail body is integrally stamped from SUS430 stainless steel with a thickness of 2.0mm. The thickness of the load-bearing part at the bottom of the groove is 2.0mm, and the thickness of the guide part on the groove wall is 1.5mm. The central guide rail body has a U-shaped groove structure with an opening width of 35mm. Two parallel guide protrusions 12 are provided at the bottom of the groove, with a protrusion height of 3mm. Welding process grooves are preset on both sides of the central guide rail body, with a width of 8mm and a depth of 2mm. Several central guide rail mounting brackets 13 are arranged on the side of the central guide rail body and fixed by welding. After welding, the weld points are polished. The middle guide rail mounting bracket 13 is made of SUS430 stainless steel and is 2.0mm thick. It has an L-shaped structure and includes a transverse connecting part 14 and a longitudinal fixing part 15. The transverse connecting part 14 fits against the side of the middle guide rail body. The fitting surface is provided with anti-slip teeth with a depth of 0.5mm. The longitudinal fixing part 15 has a rivet bolt mounting hole 16. The diameter of the rivet bolt mounting hole 16 is interference-fitted with the diameter of the rivet bolt 6. The fit tolerance is 0.05mm. Several middle guide rail mounting brackets 13 are evenly arranged along the length of the middle guide rail body with a spacing of 200mm. The rivet bolt 6 is pressed into the preset hole position of the middle guide rail mounting bracket 13. The press-fit bolt 6 is made of SUS430 stainless steel and includes a bolt head 7, a screw and a threaded part 9. The bolt head 7 is countersunk and is adapted to the press-fit bolt mounting hole 16 of the longitudinal fixing part 15 of the middle guide rail mounting bracket 13. The screw surface is provided with a knurled structure 8 with a depth of 0.4mm. The threaded part 9 is an M8×1.25 fine thread with a length of 20mm. The pressing pressure of the press-fit bolt 6 is controlled at 10MPa. The nitrile rubber gasket 17 is sleeved on the outside of the press-fit bolt 6 and fits tightly with the body sheet metal assembly surface. The nitrile rubber gasket 17 has a Shore hardness of 60HA, a ring structure, and an inner hole diameter that is clearance-fitted with the screw diameter of the press-fit bolt 6 with a clearance of 0.2mm. The thickness is 5mm. The side of the nitrile rubber gasket 17 that contacts the body assembly surface is provided with a groove with a spacing of 3mm. The outside is wrapped with a 0.2mm thick EPDM protective film. The middle guide rail assembly 11 also includes a welding protection assembly, which includes a 3mm thick copper plate protective pad and a pneumatic polishing machine. During welding, the copper plate protective pad is laid inside the U-shaped groove of the middle guide rail body at the corresponding welding point position. After welding, the welding point is polished with a pneumatic polishing machine at a polishing speed of 4000r / min, and the welding point protrusion is polished until it is flush with the surface of the middle guide rail body. The middle guide rail body, the middle guide rail mounting bracket 13 and the rivet bolt 6 can be replaced with SUS304 stainless steel, the nitrile rubber gasket 17 can be replaced with hydrogenated nitrile rubber, the welding process can be replaced with laser welding process, the welding current is 50A and the welding speed is 10mm / s, the rivet bolt 6 can be made of hot pressing riveting process, and the pressing temperature is controlled at 150℃. The upper guide rail assembly 1 and the lower guide rail assembly 18 are fixed to the car body through preset installation points, and work together with the middle guide rail assembly 11 to achieve smooth operation of the sliding door. The upper guide rail assembly 1 includes an upper guide rail body, an upper guide rail mounting bracket 3, and a buffer pad 10. The upper guide rail body is made of SUS430 stainless steel with a thickness of 1.5mm. It has an arc-shaped groove structure with an arc radius of 1000mm. A grease storage groove 2 with a width of 3mm and a depth of 1.5mm is provided in the groove. An elongated hole 5 is opened inside the upper guide rail mounting bracket 3 for fine-tuning the installation position to accommodate vehicle body assembly errors. The upper guide rail mounting bracket 3 has a positioning hole 4 inside. The buffer pad 10 is made of EPDM rubber with a Shore hardness of 65HA and a thickness of 4mm. It is fitted on the outside of the fixing bolt. The lower guide rail assembly 18 includes a lower guide rail body, a lower guide rail mounting bracket 21, a buffer pad 10, and a limiting block 20. The lower guide rail body is made of SUS430 stainless steel with a thickness of 1.8mm. It has a straight groove structure and a drainage hole 19 with a diameter of 8mm is set at the bottom of the groove. The limiting block 20 is made of polyurethane and is fixed to the end of the lower guide rail body with bolts. The lower guide rail mounting bracket 21 and the middle guide rail mounting bracket 13 have the same structure.

[0019] The working principle of this invention is as follows: The middle guide rail mounting bracket 13 is positioned by the welding process grooves on both sides of the middle guide rail body, ensuring that the transverse connecting part 14 fits snugly against the side of the body and the anti-slip teeth are fully engaged. A 2.5mm thick copper plate protective pad is laid in the U-shaped groove of the middle guide rail. Arc welding is used with a welding current of 90A, a welding voltage of 22V, a welding speed of 6.5mm / s, and a diameter of 10mm for each weld point, ensuring no false welds or slag inclusions. Then, a pneumatic polishing machine (speed 3500r / min) is used to grind the weld points until they are flush with the surface of the body, removing burrs. Then, a riveting machine is used to press the riveting bolt 6 into the preset hole position of the mounting bracket with a pressure of 9MPa. The bolt is checked to ensure that there is no looseness or shaking. A nitrile rubber gasket 17 is placed on the outside of the riveting bolt 6 to ensure that the bolt is secure. With the textured surface facing the vehicle body, following the pre-installation process of the middle guide rail assembly 11, the upper guide rail mounting bracket 3 is welded and polished, and the first buffer pad is installed. The lower guide rail mounting bracket 21 is welded and polished, and the second buffer pad is installed. The polyurethane limiting block is fixed with M6 bolts, and the upper, middle, and lower guide rail assemblies 18 are positioned to the preset installation positions on the light truck body. The arc trajectory of the upper guide rail is adjusted to ensure smooth connection with the straight trajectories of the middle and lower guide rails, with a centerline parallelism error ≤0.5mm. The upper and lower guide rails are tightened with rivet bolts 6 and upper and lower guide rail fixing bolts, with a tightening torque of 28N.m. A torque wrench is used to check to ensure that all bolts are tightened to the standard. Lithium-based grease is injected into the guide protrusion 12 of the middle guide rail and the grease storage tank 2 of the upper guide rail, with a dosage of 8g per meter of guide rail.

[0020] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A high-stability sliding door guide rail structure capable of preventing noise, characterized in that, The application relates to a three-point support guiding structure for a sliding door, which comprises, in sequence along the height direction of the vehicle body, an upper guide rail assembly (1), a middle guide rail assembly (11) and a lower guide rail assembly (18), the three assemblies form a three-point support guiding structure, and jointly constrain the sliding door running track, the middle guide rail assembly (11) is a core bearing component, and comprises a middle guide rail body, a middle guide rail mounting support (13), a press-in bolt (6) and a neoprene rubber gasket (17), the middle guide rail mounting support (13) is arranged on the side surface of the middle guide rail body and is fixed by welding, the welding points are polished after welding, the press-in bolt (6) is press-connected to the preset hole position of the middle guide rail mounting support (13), and the neoprene rubber gasket (17) is sleeved outside the press-in bolt (6) and is tightly combined with the vehicle body sheet metal assembly surface, the upper guide rail assembly (1) and the lower guide rail assembly (18) are respectively fixed with the vehicle body through preset mounting points and realize stable sliding door running in cooperation with the middle guide rail assembly (11).

2. The high stability slide door guide structure against noise according to claim 1, wherein The middle guide rail body is integrally stamped and formed by using SUS430 stainless steel material, and the thickness is 1.5-2.0 mm, wherein the thickness of the groove bottom bearing part is 2.0 mm, and the thickness of the groove wall guiding part is 1.5 mm; the middle guide rail body is in a U-shaped groove structure, the opening width is 30-35 mm, two parallel guiding protrusions (12) are arranged on the groove bottom, and the protrusion height is 2-3 mm; and preset welding process grooves are arranged on the two sides of the middle guide rail body, the process groove width is 5-8 mm, and the process groove depth is 1-2 mm.

3. The high stability sliding door guide structure against noise according to claim 1, wherein The middle guide rail mounting support (13) is stamped and formed by using SUS430 stainless steel material, and the thickness is 1.8-2.0 mm; the structure is L-shaped, and the L-shaped structure comprises a transverse connecting part (14) and a longitudinal fixing part (15); the transverse connecting part (14) is combined with the side surface of the middle guide rail body, an anti-skid tooth pattern with a depth of 0.3-0.5 mm is arranged on the combined surface, the longitudinal fixing part (15) is provided with a press-in bolt mounting hole (16), the press-in bolt mounting hole (16) is in interference fit with the rod diameter of the press-in bolt (6), the fit tolerance is 0.02-0.05 mm, and a plurality of middle guide rail mounting supports (13) are uniformly arranged along the length direction of the middle guide rail body with a spacing of 150-200 mm.

4. The high stability slide door guide structure against noise according to claim 1, wherein The press-in bolt (6) is made of SUS430 stainless steel material, and comprises a bolt head part (7), a screw rod and a threaded part (9); the bolt head part (7) is in a countersunk structure and is matched with the press-in bolt mounting hole (16) of the longitudinal fixing part (15) of the middle guide rail mounting support (13); a knurl structure (8) with a depth of 0.2-0.4 mm is arranged on the surface of the screw rod; the threaded part (9) adopts M8x1.25 fine thread, and the length is 15-20 mm; and the press-in pressure of the press-in bolt (6) is controlled to be 8-10 MPa.

5. The high stability sliding door guide structure according to claim 1, wherein The Shore hardness of the neoprene rubber gasket (17) is 50-60 HA, the structure is annular, the inner hole diameter is in clearance fit with the screw rod diameter of the press-in bolt (6), the clearance is 0.1-0.2 mm, the thickness is 3-5 mm, and the side, which is in contact with the vehicle body assembly surface, of the neoprene rubber gasket (17) is provided with concave-convex lines with a spacing of 2-3 mm, and a layer of EPDM protective film with a thickness of 0.1-0.2 mm is wrapped outside.

6. The rattle-free high-stability sliding door guide structure according to claim 1, wherein The middle rail assembly (11) further comprises a welding protection assembly, which comprises a copper plate protection pad with a thickness of 2-3 mm and a pneumatic polisher. During welding, the copper plate protection pad is laid in the U-shaped groove of the middle rail body corresponding to the welding point position. After welding, the pneumatic polisher is used to polish the welding point, and the polishing speed is 3000-4000 r / min. The protruding welding point is polished to be flush with the surface of the middle rail body.

7. The rattle-free high-stability sliding door guide structure according to claim 1, wherein The upper rail assembly (1) comprises an upper rail body, an upper rail mounting bracket (3), and a buffer pad. The upper rail body is made of SUS430 stainless steel with a thickness of 1.2-1.5 mm and has an arc-shaped groove structure with an arc radius of 800-1000 mm. A lubricating grease storage groove (2) with a width of 2-3 mm and a depth of 1-1.5 mm is arranged in the groove. A long circular hole (5) is formed in the upper rail mounting bracket (3) for fine adjustment of the installation position and adaptation to the body assembly error. A positioning hole (4) is formed in the upper rail mounting bracket (3). The buffer pad is made of EPDM rubber with a Shore hardness of 55-65 HA and a thickness of 3-4 mm, and is sleeved on the outside of the fixing bolt.

8. The rattle-free high-stability sliding door guide structure according to claim 1, wherein The lower rail assembly (18) comprises a lower rail body, a lower rail mounting bracket (21), a buffer pad (10), and a limiting block (20). The lower rail body is made of SUS430 stainless steel with a thickness of 1.8 mm and has a straight groove structure. A drainage hole (19) with a diameter of 5-8 mm is arranged at the bottom of the groove. The limiting block (20) is made of polyurethane and is fixed to the end of the lower rail body by a bolt. The lower rail mounting bracket (21) and the middle rail mounting bracket (13) have the same structure.

9. The rattle-free high-stability sliding door guide structure according to claim 1, wherein The middle rail body, the middle rail mounting bracket (13), and the press-in bolt (6) can be replaced by SUS304 stainless steel. The NBR rubber gasket (17) can be replaced by hydrogenated nitrile rubber. The welding process can be replaced by laser welding process with a welding current of 50 A and a welding speed of 10 mm / s. The press-in bolt (6) can be made by hot press-in process with a pressing temperature controlled at 150°C.

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