Automobile seat slide rail sliding support structure

Abstract

The utility model discloses a kind of automobile seat slide rail sliding support structures, including upper slide rail and lower slide rail, support shaft is provided on the upper slide rail, rotating sleeve is equipped with gyro wheel on the support shaft, the gyro wheel includes inner ring bushing and is successively outwardly sleeved with metal middle ring and plastic outer ring from inner ring bushing exterior, the inner ring bushing has rotating sleeve on the center through-hole of support shaft, the inner side wall of the center through-hole is coated with resistance-reducing coating, the resistance-reducing coating is used to reduce the rotating friction of gyro wheel on support shaft, the plastic outer ring is supported on lower slide rail.Gyro wheel adopts inner middle outer three-layer composite structure design, and resistance-reducing coating is coated in inner layer bushing, sliding resistance is greatly reduced, metal middle ring provides strong bearing capacity for gyro wheel, can resist impact load, plastic outer ring can buffer vibration, reduce metal contact noise, and designed with clearance elimination structure cooperating with gyro wheel, further eliminate the clearance swing and abnormal sound between gyro wheel and slide rail.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat slide rail technology, specifically to a sliding support structure for automotive seat slide rails. Background Technology

[0002] As a core mechanism for adjusting passenger space and seating comfort, the smoothness of car seat rails, their noise level, and structural stability directly affect the overall driving experience and safety. Bearings, as key components enabling relative sliding within the rails, have their performance becoming a core factor restricting the quality of the rails. For a long time, car seat rails have widely adopted two types of products for sliding: traditional rolling bearings (such as ball bearings and needle bearings) and ordinary sliding bearings. While these can meet basic sliding requirements, limitations in structural design and material characteristics have gradually revealed multiple inherent defects in practical applications.

[0003] Rolling bearings rely on rolling elements such as balls and needle rollers for movement. Although they have low starting resistance and a stable coefficient of friction, their multi-component structure results in a large radial dimension. The point contact between the rolling elements and the raceway is prone to fatigue pitting and wear due to stress concentration. Furthermore, the motion interference between the rolling elements and the cage, as well as abrasive wear caused by impurities, can generate significant vibration and high-frequency noise. They also have stringent lubrication requirements, are difficult to maintain in enclosed environments, and are prone to shortening their lifespan due to lubrication failure. Ordinary sliding bearings have a relatively simple structure, and some types have strong load-bearing capacity. However, their metal-to-metal contact transmission method results in a high coefficient of friction, significant energy consumption, and wear. Pure plastic sliding bearings lack rigidity, are prone to deformation, and cannot withstand the weight of passengers or the impact load of the vehicle. Moreover, most require continuous lubrication, and lubricant leakage or aging can easily cause contamination and jamming.

[0004] As the automotive consumer market continues to upgrade its requirements for driving comfort and quietness, and as new energy vehicles have core demands for lightweight, long-life, and low-maintenance components, the limitations of traditional bearings in seat rails are becoming increasingly apparent. Therefore, a sliding support structure for automotive seat rails is proposed. Utility Model Content

[0005] To address the above technical problems, this utility model provides a sliding support structure for automotive seat rails, aiming to improve the smoothness, quietness, and load-bearing strength of the rails.

[0006] The technical solution is as follows: A sliding support structure for an automotive seat rail includes an upper rail and a lower rail. The key features are: a support shaft is provided on the upper rail, and a roller is rotatably mounted on the support shaft. The roller includes an inner bushing and a metal middle ring and a plastic outer ring sequentially arranged from the outside of the inner bushing outwards. The inner bushing has a central through hole rotatably mounted on the support shaft. A drag-reducing coating is applied to the inner wall of the central through hole to reduce the rotational friction of the roller on the support shaft. The plastic outer ring is supported on the lower rail. Using this structure, a roller structure replacing traditional bearings is provided between the upper and lower rails. This roller is a three-layer composite structure (inner, middle, and outer layers). The drag-reducing coating on the inner wall of the inner bushing reduces friction, the metal middle ring serves as a support layer, and the plastic outer ring provides noise reduction and vibration damping, solving the pain points of traditional bearings in terms of friction, load-bearing capacity, and noise.

[0007] Preferably, both axial ends of the inner ring bushing are provided with flanges that fit against the outer edge of the metal middle ring. This structure ensures a tight connection between the inner ring bushing and the metal middle ring, preventing them from detaching during bearing operation.

[0008] Preferably, the inner ring bushing is made of steel sheet rolled into a ring shape, with a pre-reserved gap on one side. This structure, made by rolling steel sheet, is simple to manufacture and facilitates the application of a drag-reducing coating. The gap allows the inner ring bushing to expand, reducing assembly difficulty and cost, improving assembly efficiency, and also adapting to temperature changes during bearing operation, thus providing a certain buffering effect.

[0009] Preferably, the drag-reducing coating is a Teflon coating. With this structure, Teflon has a coefficient of friction of only 0.04-0.15, almost no substances adhere to it, the surface is extremely smooth, dust and impurities are difficult to adhere to, effectively reducing frictional wear between components, and it also has both high-temperature and low-temperature resistance.

[0010] Preferably, the metal inner ring and the plastic outer ring are integrally molded, and the outer surface of the metal inner ring is distributed with small grooves.

[0011] The metal inner ring is made of bearing steel. This integrated molding structure facilitates manufacturing, and the small grooves on the outer wall of the metal inner ring enhance the connection between the metal inner ring and the plastic outer ring, preventing the plastic outer ring from loosening or detaching under stress or vibration. Bearing steel, with its high strength and rigidity, provides better support and load-bearing capacity.

[0012] Preferably, the lower slide rail has a strip-shaped groove extending along its length, the upper slide rail extends into the strip-shaped groove, and two rollers are fixed at each of the front and rear ends of the upper slide rail. The four rollers can slide on the bottom of the strip-shaped groove. With this structure, rollers replace traditional bearings and are used between the upper and lower slide rails of the automotive seat slide rail to solve the pain points of traditional bearings in terms of friction, load-bearing capacity, and noise.

[0013] Preferably, the upper slide rail has brackets fixed at both its front and rear ends, with both ends of the brackets extending to the sides of the upper slide rail. A support shaft is fixed to the end of each bracket, and the bracket has a clearance notch corresponding to the position of the support shaft. The roller is positioned at the clearance notch. With this structure, the roller is fixed to the upper slide rail by the brackets, ensuring a tight connection between them.

[0014] Preferably, the upper slide rail has a side support plate, and a gap elimination mechanism is provided between the upper end of the side support plate and the top of the strip groove. The gap elimination mechanism is used to eliminate the gap between the upper slide rail and the lower slide rail in the height direction. With this structure, the gap elimination mechanism can eliminate abnormal noise and shaking in the car seat slide rail mechanism during use, and also improve the service life of the rollers.

[0015] Preferably, the gap-eliminating mechanism includes a U-shaped plastic shell, the U-shaped open side of which is engaged with the upper end of a side support plate. A spring clip is disposed between the inside of the plastic shell and the upper end of the side support plate. The elastic force applied by the spring clip causes the top of the plastic shell to abut against the top of the strip groove. With this structure, the spring clip, utilizing its own elasticity, abuts against the plastic shell, thereby eliminating the gap at its source.

[0016] Preferably, a mounting notch is provided at the position of the side support plate corresponding to the position of the plastic shell, and the spring is installed in the mounting notch. With the above structure, the mounting notch provides a mounting position for the spring, so that it can be used together with the plastic shell to eliminate gaps.

[0017] Compared with existing technologies, the advantages of this utility model are as follows: A specially designed roller structure replaces the bearing structure in the original car seat slide rail. This roller employs a three-layer composite structure design, with the inner bushing coated with a drag-reducing coating, significantly reducing the sliding resistance of the slide rail. The metal inner ring provides the roller with strong load-bearing capacity, resisting the impact load of the driver's and passengers' weight and vehicle bumps. The plastic outer ring buffers vibrations and reduces metal-to-metal contact noise, giving the roller low friction, high load-bearing capacity, and quiet operation. A gap-eliminating mechanism is also designed to work with the roller, further eliminating gap wobble between the roller and the slide rail. This fundamentally solves the problems of "metallic impact noise" and "loose, rattling noises" during vehicle movement or seat adjustment. Combined with the shock-absorbing properties of the plastic outer ring, it achieves a dual optimization of the quiet in-car experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of roller 4;

[0019] Figure 2 for Figure 1 An explosion diagram;

[0020] Figure 3 This is a schematic diagram of a car seat slide rail.

[0021] Figure 4 for Figure 3 Side view;

[0022] Figure 5 This is a schematic diagram of the upper slide rail 1 and roller 4;

[0023] Figure 6 A schematic diagram of bracket 1a and roller 4;

[0024] Figure 7 for Figure 4 AA section view;

[0025] Figure 8 for Figure 7 Enlarged schematic diagram of section I. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0027] like Figures 1 to 4 As shown, a sliding support structure for an automotive seat includes an upper slide rail 1 and a lower slide rail 2. A support shaft 3 is provided on the upper slide rail 1, and a roller 4 is rotatably mounted on the support shaft 3. The roller 4 includes an inner ring bushing 4a and a metal middle ring 4b and a plastic outer ring 4c sequentially arranged from the outside of the inner ring bushing 4a outwards. The inner ring bushing 4a has a central through hole 4a1 that is rotatably mounted on the support shaft 4. The inner sidewall of the central through hole 4a1 is coated with a drag-reducing coating, which is used to reduce the rotational friction of the roller 4 on the support shaft 3. The plastic outer ring 4c is supported on the lower slide rail 2.

[0028] Both ends of the inner ring bushing 4a are provided with flanges 4a2 that fit against the outer edge of the metal middle ring 4b. The inner ring bushing 4a is made of steel sheet rolled into a ring structure, with a gap notch reserved on one side. The existence of this gap notch gives the inner ring bushing 2 a certain expansion capacity, reduces assembly difficulty and cost, improves assembly efficiency, and can also adapt to the temperature changes of the bearing during operation, thus also having a certain buffering effect.

[0029] The drag-reducing coating is a Teflon coating. Teflon, or polytetrafluoroethylene (PTFE), is a high-performance polymer material with a coefficient of friction of only 0.04-0.15. Almost no substances adhere to Teflon, and its surface is extremely smooth, making it difficult for dust, impurities, etc. to adhere. This effectively reduces the frictional wear of components and allows for long-term use in a temperature range of -200℃ to 260℃. Short-term use temperatures can even reach up to 300℃. It can be coated onto the inner surface of the inner ring bushing 4a to reduce resistance and give it low-friction characteristics.

[0030] The metal inner ring 4b and the plastic outer ring 4c are integrally molded. Small grooves 4b1 are distributed on the outer surface of the metal inner ring 4b. These grooves 4b1 increase the connection strength between the metal inner ring 4b and the plastic outer ring 4c, ensuring a secure connection and preventing them from loosening during roller 4 operation. The metal inner ring 4b is made of bearing steel, which has high strength and rigidity, effectively bearing the radial or axial loads of the seat and passengers, preventing deformation due to excessive force, and providing support and load-bearing function.

[0031] like Figures 3 to 8 As shown, the lower slide rail 2 has a strip groove 2a extending along its length direction. The upper slide rail 1 extends into the strip groove 2a. A motor 6 is also provided on the upper slide rail 1. The output drive shaft of the motor 6 extends into a gearbox 7 connected to the upper slide rail 1. The gearbox 7 includes a worm gear and a worm shaft that mesh with each other. Two rollers 4 are fixed at each of the front and rear ends of the upper slide rail 1. The four rollers 4 can slide on the bottom of the strip groove 2a.

[0032] Both ends of the upper slide rail 1 are fixed with brackets 1a, and both ends of the brackets 1a extend to the side of the upper slide rail 1. The support shaft 3 is fixed at the end of the bracket 1a, and the bracket 1a is provided with a clearance notch 1b corresponding to the position of the support shaft 3. The roller 4 is arranged at the clearance notch 1b.

[0033] The motor 6 drives the gearbox 7 to work, which in turn drives the upper slide rail 1 to slide on the lower slide rail 2. Since the inner ring bushing 4a of the roller 4 is coated with a drag-reducing coating (Teflon), it can effectively reduce the resistance when the slide rail slides, making seat adjustment easier and smoother. The metal middle ring 4b bears the load of the seat and the driver and passengers with high rigidity and distributes it evenly into the strip groove 2a of the lower slide rail 2, preventing the slide rail from deforming and wearing due to concentrated force. The plastic outer ring 4c uses elastic shock absorption to reduce the vibration caused by the slide rail sliding and vehicle bumps, and also reduces the noise generated by metal contact. In addition, the three-layer structure of the roller 4 can isolate impurities and adapt to the complex environment inside the vehicle. Combined with the self-lubricating properties of the drag-reducing coating, it reduces maintenance needs and extends the overall service life of the slide rail and roller 4.

[0034] A side support plate 1c is provided on the side of the upper slide rail 1. A gap elimination mechanism 5 is provided between the upper end of the side support plate 1c and the top of the strip groove 2a. The gap elimination mechanism 5 is used to eliminate the gap between the upper slide rail 1 and the lower slide rail 2 in the height direction.

[0035] The gap elimination mechanism 5 includes a U-shaped plastic shell 5a. The U-shaped open side of the plastic shell 5a is engaged with the upper end of the side support plate 1c. A spring piece 5b is disposed between the inside of the plastic shell 5a and the upper end of the side support plate 1c. The elastic force applied by the spring piece 5b causes the top of the plastic shell 5a to abut against the top of the strip groove 2a. An installation notch 1c1 is provided on the side support plate 1c at the position corresponding to the plastic shell 5a, and the spring piece 5b is installed in the installation notch 1c1. The gap elimination mechanism 5 works in conjunction with the roller 4 to further eliminate the gap and wobble between the roller 4 and the slide rail, fundamentally solving the problems of "metallic knocking noise" and "loose rattling noise" during vehicle operation or seat adjustment.

[0036] The specific preparation and installation process of the sliding support structure for the car seat slide rail is as follows: Two brackets 1a are connected to the bottom of the upper slide rail 1, and the two ends of the brackets 1a are provided with clearance notches 1b. The support shaft 3 is set in the clearance notches 1b. The inner ring bushing 4a of the roller 4 is made of an "L"-shaped steel sheet, and the inner side of the steel sheet is coated with a drag-reducing coating (Teflon). After coating, it is rolled into a ring structure with a flange on one side. The metal middle ring 4b is fitted onto the inner ring bushing 2 from the end away from the flange 2a. The other side of the inner ring bushing 4a is also made into a flange structure to form a firm connection with the metal middle ring 4b. Then, the plastic outer ring 4c is fitted onto the outside of the metal middle ring 4b to assemble the roller 4. Then, it is assembled and locked onto the support shaft 3 to form an integral part with the upper slide rail 1. A gap elimination mechanism 5 is installed on the side support plate 1c of the upper slide rail 1. After installation, it is assembled with the lower slide rail 2 to obtain the complete car seat slide rail structure.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A sliding support structure for an automotive seat slide rail, comprising an upper slide rail (1) and a lower slide rail (2), characterized in that: The upper slide rail (1) is provided with a support shaft (3), and a roller (4) is rotatably mounted on the support shaft (3). The roller (4) includes an inner ring bushing (4a) and a metal middle ring (4b) and a plastic outer ring (4c) sequentially arranged from the outside of the inner ring bushing (4a) outward. The inner ring bushing (4a) has a central through hole (4a1) rotatably mounted on the support shaft (3). The inner sidewall of the central through hole (4a1) is coated with a drag-reducing coating. The drag-reducing coating is used to reduce the rotational friction of the roller (4) on the support shaft (3). The plastic outer ring (4c) is supported on the lower slide rail (2).

2. The sliding support structure for an automotive seat slide rail according to claim 1, characterized in that: Both ends of the inner ring bushing (4a) are provided with flanges (4a2) that fit against the outer edge of the metal middle ring (4b).

3. The sliding support structure for an automotive seat slide rail according to claim 2, characterized in that: The inner ring bushing (4a) is made of steel sheet rolled into a ring structure, with a gap notch reserved on one side.

4. The sliding support structure for an automotive seat slide rail according to claim 1, characterized in that: The drag-reducing coating is a Teflon coating.

5. The sliding support structure for an automotive seat slide rail according to claim 4, characterized in that: The metal inner ring (4b) and the plastic outer ring (4c) are integrally formed, and small grooves (4b1) are distributed on the outer surface of the metal inner ring (4b). The metal middle ring (4b) is made of bearing steel.

6. The sliding support structure for an automotive seat slide rail according to claim 1, characterized in that: The lower slide rail (2) has a strip groove (2a) extending along its length direction. The upper slide rail (1) extends into the strip groove (2a) and two rollers (4) are fixed at each of the front and rear ends of the upper slide rail (1). The four rollers (4) can slide on the bottom of the strip groove (2a).

7. The sliding support structure for an automotive seat slide rail according to claim 6, characterized in that: The upper slide rail (1) is fixed with brackets (1a) at both ends. The two ends of the brackets (1a) extend to the side of the upper slide rail (1). The support shaft (3) is fixed at the end of the bracket (1a). The bracket (1a) is provided with a clearance notch (1b) corresponding to the position of the support shaft (3). The roller (4) is arranged at the clearance notch (1b).

8. The sliding support structure for an automotive seat slide rail according to claim 7, characterized in that: The upper slide rail (1) has a side support plate (1c) on its side. A gap elimination mechanism (5) is provided between the upper end of the side support plate (1c) and the top of the strip groove (2a). The gap elimination mechanism (5) is used to eliminate the gap between the upper slide rail (1) and the lower slide rail (2) in the height direction.

9. The sliding support structure for an automotive seat slide rail according to claim 8, characterized in that: The gap elimination mechanism (5) includes a plastic shell (5a) with a U-shaped structure. The U-shaped open side of the plastic shell (5a) is engaged with the upper end of the side support plate (1c). A spring piece (5b) is provided between the inside of the plastic shell (5a) and the upper end of the side support plate (1c). The elastic force applied by the spring piece (5b) causes the top of the plastic shell (5a) to abut against the top of the strip groove (2a).

10. The sliding support structure for an automotive seat slide rail according to claim 9, characterized in that: An installation notch (1c1) is provided at the position of the side support plate (1c) corresponding to the position of the plastic shell (5a), and the spring piece (5b) is installed in the installation notch (1c1).

Images