Rear-row large-span electric backrest framework

Abstract

The utility model belongs to the technical field of automobile seats, and particularly relates to a rear-row large-span electric backrest framework which comprises a main framework assembly, a driving assembly used for driving the main framework assembly to adjust the angle is arranged on the main framework assembly, and connecting assemblies are symmetrically arranged on the two sides of the main framework assembly. The connecting assembly is provided with a horizontal rotation axis, the rotation axis is provided with a limiting assembly, the output end of the driving assembly is connected to the middle area of the transmission shaft, and the driving assembly, the limiting assembly and the connecting assembly are connected in series through the transmission shaft. The backrest motor is arranged in the middle area of the large-span backrest, and a transmission shaft limiting structure is additionally arranged, so that the situation that when the backrest is located at the front limiting position and the rear limiting position, the motor twists a transmission shaft, so that bending deformation of the transmission shaft is too large, the durable life requirement of backrest adjustment cannot be met, and abnormal sound is generated is avoided. The riding comfort is improved, and the arrangement of various functional parts of the seat is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile seats, and in particular relates to a rear-row electric backrest frame with a large span. Background Art

[0002] Consumers in the current market are increasingly demanding more comfortable features in non-luxury car seats, especially in the rear seats, with demands for massage, ventilation, heating, electric adjustment, and other functions. However, few mass-produced rear seats feature electric adjustment. Furthermore, if the span of the recliners on either side of the backrest exceeds 600mm, the backrest motor is typically located on one recliner (inside or outside). This approach not only compromises comfort but also leads to poor synchronization when unlocking and locking the recliners, as well as the generation of unusual noises. This also impacts the design of the backrest structure and the placement of various functional components. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the present invention provides a rear-row electric backrest frame with a large span. By arranging the backrest motor in the middle area of ​​the large-span backrest (the spacing between the angle adjusters on both sides exceeds 650mm) and adding a transmission shaft limiting structure, the problem of the span of the angle adjusters on both sides of the backrest exceeding 600mm is solved. Basically, the backrest motor is arranged at the angle adjuster on one side (inside or outside), which not only affects the comfort, but also causes poor synchronization of unlocking / locking the angle adjuster and is prone to abnormal noise, and affects the structural design of the backrest frame and the layout of various functional parts.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a rear-row large-span electric backrest frame, including a main frame assembly, on which a driving assembly is provided for driving the main frame assembly to adjust the angle, and connecting assemblies are symmetrically provided on both sides of the main frame assembly, and the connecting assembly has a horizontal rotation axis, on which a limiting assembly is provided, and the limiting assembly is axially as close to the driving assembly as possible, and the output end of the driving assembly is connected to the middle area of ​​the transmission shaft.

[0005] Preferably, the drive assembly includes a motor mounting bracket arranged on the main frame assembly, a drive motor is fixedly installed on one side of the motor mounting bracket by bolts, the output end of the drive motor is connected to a transmission shaft sleeve, and the transmission shaft sleeve is sleeved on the middle part of the transmission shaft.

[0006] Preferably, the limiting assembly also includes a transmission shaft limiting plate fixedly connected to the other side of the motor mounting bracket, the transmission shaft limiting plate is provided with a hole, the hole is sleeved on the transmission shaft, and a first limiting bushing and a second limiting bushing are installed between the transmission shaft and the hole.

[0007] Preferably, the first limiting bushing and the second limiting bushing are made of plastic or Teflon respectively.

[0008] Preferably, the connecting assembly includes an upper connecting plate and a lower connecting plate installed on both sides of the main frame assembly, and an adjuster is provided at the connection between the upper connecting plate and the lower connecting plate. The axis of the adjuster is connected to the end of the transmission shaft, and a retaining ring is provided on the end of the transmission shaft outside the axis of the adjuster.

[0009] Preferably, it is characterized in that the transmission shaft is a spline shaft.

[0010] Preferably, the first limiting bushing, the angle adjuster and the transmission shaft sleeve are all provided with the same pattern matching the transmission shaft.

[0011] Preferably, a lower cross tube assembly is provided between the two lower connecting plates.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention proposes a rear-row large-span electric backrest frame, which improves riding comfort by arranging the backrest motor in the middle area of ​​the large-span backrest (the spacing between the angle adjusters on both sides exceeds 650mm) and adding a transmission shaft limiting structure, which is beneficial to the arrangement of various functional parts of the seat.

[0013] Additional aspects and advantages of the present invention will be given in the following description, and some will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of a large-span electric backrest frame in the rear row.

[0015] Figure 2 This is a three-dimensional structural exploded diagram of a rear-seat large-span electric backrest frame.

[0016] Figure 3 This is an enlarged view of point A of a rear-seat large-span electric backrest frame.

[0017] Figure 4 This is a three-dimensional structural exploded diagram of the limiting components of a rear-seat large-span electric backrest frame.

[0018] Figure 5 This is a cross-sectional view of the limiting component of a rear-seat large-span electric backrest frame.

[0019] In the figure: 1. Main frame assembly; 2. Connection assembly; 21. Upper connecting plate; 22. Lower connecting plate; 23. Angle adjuster; 24. Retaining ring; 3. Drive assembly; 31. Mounting bracket; 32. Drive motor; 33. Drive shaft sleeve; 4. Limit assembly; 41. Drive shaft limit plate; 42. Hole; 43. First limit bushing; 44. Second limit bushing; 5. Drive shaft; 6. Lower cross tube assembly. DETAILED DESCRIPTION

[0020] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present invention but are not intended to limit the scope of the present invention. All other embodiments obtained by persons of ordinary skill in the art without creative effort are intended to fall within the scope of protection of the present invention.

[0021] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a rear-row electric backrest frame with a large span includes a main frame component 1, on which a driving component 3 for driving the main frame component 1 to adjust the angle is provided. Connecting components 2 are symmetrically provided on both sides of the main frame component 1. The connecting component 2 has a horizontal rotation axis, on which a limiting component 4 is provided. The output end of the driving component 3 is connected to the middle area of ​​the transmission shaft 5, and the driving component 3, the limiting component 4, and the connecting component 2 are connected in series through the transmission shaft 5.

[0022] This utility model proposes a rear-seat, long-span electric backrest frame, comprising a main frame assembly 1, which serves as the supporting foundation for the entire backrest. This structure is both strong and lightweight, adapting to the installation requirements and passenger comfort demands of various vehicle models. The main frame assembly 1 is constructed from a high-strength alloy, ensuring stability and durability over long periods of use.

[0023] The main frame assembly 1 is equipped with a drive assembly 3 for adjusting the seat backrest angle. This drive assembly 3 houses a high-efficiency motor that, through a precise gear transmission system, allows for smooth and rapid adjustment of the backrest angle to meet the individual needs of different passengers for seat inclination.

[0024] Connecting assemblies 2 are symmetrically positioned on either side of the main frame assembly 1. These components not only securely connect the backrest frame to the seat base or vehicle body structure, but also provide a high degree of flexibility. Designed with a horizontal axis of rotation, these connecting assemblies allow the backrest to swing forward and backward within a certain range, enhancing the seat's adaptability and comfort.

[0025] A transmission shaft 5 is positioned along the rotational axis, serving as a key component connecting the drive assembly 3 and the connection assembly 2. It transmits power and enables angle adjustment. The output end of the drive assembly 3 is directly connected to the center region of the transmission shaft 5. Placing the drive assembly 3 in the center of the long-span backrest (with the recliners 23 spaced over 60mm apart) simplifies the structure and improves transmission efficiency, making backrest angle adjustment more precise and rapid. This improves ride comfort and facilitates the arrangement of various functional components of the seat.

[0026] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the drive assembly 3 includes a motor mounting bracket 31 arranged on the main frame assembly 1, and a drive motor 32 is fixedly installed on one side of the motor mounting bracket 31 by bolts. The output end of the drive motor 32 is connected to a transmission shaft sleeve 33, and the transmission shaft sleeve 33 is sleeved on the middle part of the transmission shaft 5.

[0027] Specifically, the drive assembly 3 not only affects the accuracy and efficiency of backrest adjustment but also directly impacts the passenger's riding experience. The drive assembly 3 includes a motor mounting bracket 31 mounted on the main frame assembly 1. This bracket is made of high-strength, corrosion-resistant material to ensure stability and reliability during long-term use.

[0028] On one side of the motor mounting bracket 31, a bolt is used to achieve a stable connection with the drive motor 32. As the heart of the drive assembly 3, the drive motor 32 is a high-performance, low-noise DC brushless motor with the advantages of small size, light weight and high efficiency.

[0029] The output end of the drive motor 32 is connected to the transmission sleeve 33 through a transmission mechanism. As the key component connecting the drive motor 32 to the drive shaft 5, the transmission sleeve 33 is made of a special wear-resistant and high-temperature-resistant material, ensuring efficient and durable power transmission. The transmission sleeve 33 is positioned centrally around the drive shaft 5. Through its mating and lubrication, it ensures smooth and precise power transmission. This not only improves transmission efficiency but also reduces noise and wear during the transmission process, extending the service life of the transmission system.

[0030] The drive assembly 3 achieves accurate and rapid adjustment of the backrest frame angle through precise coordination and optimized design of key components such as the motor mounting bracket 31, the drive motor 32, the transmission shaft sleeve 33 and the locking device, providing passengers with a more comfortable and convenient riding experience.

[0031] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the limit assembly 4 includes a transmission shaft limit plate 41 fixedly connected to the other side of the motor mounting bracket 31, and a hole 42 is provided on the transmission shaft limit plate 41. The hole 42 is sleeved on the transmission shaft 5, and a first limit bushing 43 and a second limit bushing 44 are installed between the transmission shaft 5 and the hole 42.

[0032] The drive shaft stop plate 41, a crucial support and stop component for the drive shaft 5, is made of high-strength, corrosion-resistant material to ensure its stability and durability during long-term use. A hole 42 is provided on the drive shaft stop plate 41, matching the drive shaft 5. This not only provides the necessary passage for the drive shaft 5 but also, through its size and shape, ensures axial positioning of the drive shaft 5.

[0033] To ensure stable rotation of the transmission shaft 5 within the hole 42 and reduce wear, a first stop bushing 43 and a second stop bushing 44 are installed between the transmission shaft 5 and the hole 42. These bushings offer excellent lubrication and wear resistance. These bushings not only lubricate the contact surface between the transmission shaft 5 and the hole 42 but also, through their size and shape, radially limit the transmission shaft 5, preventing transmission failure or damage caused by shaking or deformation of the transmission shaft 5.

[0034] The installation location and number of the first and second stop bushings 43, 44 have been carefully calculated and tested to ensure they evenly distribute the load and wear incurred by the transmission shaft 5 during rotation and at the backrest's forward and backward extreme positions. The first and second stop bushings 43, 44 are also easy to replace and maintain. When worn to a certain extent due to long-term use, they can be easily removed and replaced with new ones, extending the service life of the stop assembly 4 and maintaining its optimal transmission performance.

[0035] The limiting assembly 4 realizes dual axial and radial limiting and stable rotation of the drive shaft 5 through the coordination and optimized design of key components such as the drive shaft 5, the drive shaft limiting plate 41, the hole 42, the first limiting bushing 43 and the second limiting bushing 44, further improving the adjustment accuracy and durability of the entire backrest frame.

[0036] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the first limiting bushing 43 and the second limiting bushing 44 are made of plastic and Teflon respectively.

[0037] Specifically, the first and second stop bushings 43, 44 are crucial to the operating efficiency and wear of the drive shaft 5, as well as the adjustment accuracy and service life of the entire backrest frame. To ensure these critical performance characteristics, the first and second stop bushings 43, 44 are made of plastic and Teflon, respectively. These two materials were chosen not by chance but based on their unique physical and chemical properties.

[0038] Teflon, also known as polytetrafluoroethylene (PTFE), is a material with extremely high chemical stability and a low coefficient of friction. It can maintain stable performance over a wide temperature range (-200°C to +260°C) and will not deform or melt due to high temperatures, nor will it become brittle due to low temperatures. The surface of Teflon is very smooth and has an extremely low coefficient of friction, which enables it to reduce frictional resistance and wear when in contact with the first limit bushing 43, thereby improving transmission efficiency. In addition, Teflon also has good corrosion resistance and electrical insulation, and can maintain stable performance in various harsh environments.

[0039] Plastics, particularly those engineered for high-load, high-speed applications, such as nylon, polyoxymethylene (POM), or polyetheretherketone (PEEK), are also commonly used to manufacture limit bushings. These plastics offer high strength, high wear resistance, and good self-lubricating properties. Compared to Teflon, they have higher hardness and load-bearing capacity, and can maintain stable shape and size under high loads. Furthermore, these plastics are generally less expensive, making the manufacture and replacement of limit bushings more economical.

[0040] Combine Figure 1 and Figure 2 As shown, the connecting assembly 2 includes an upper connecting plate 21 and a lower connecting plate 22 installed on both sides of the main frame assembly 1. An adjuster 23 is provided at the connection between the upper connecting plate 21 and the lower connecting plate 22. The axis of the adjuster 23 is connected to the end of the transmission shaft 5. A retaining ring 24 is provided on the end of the transmission shaft 5 on the outside of the axis of the adjuster 23.

[0041] Furthermore, the connecting assembly 2 securely connects the main frame assembly 1 to the rest of the seat and allows the backrest to be adjusted within a certain range to accommodate different passenger postures. Connecting assembly 2 comprises an upper connecting plate 21 and a lower connecting plate 22 mounted on either side of the main frame assembly 1. These connecting plates not only provide connection and support, but also, through their structural design, enable seamless integration of the backrest frame with the seat base or vehicle body structure.

[0042] The upper and lower connecting plates 21, 22, forming the main components of the connecting assembly 2, are made of high-strength, corrosion-resistant materials to ensure stability and durability during long-term use. Through processing and installation procedures, they are installed on both sides of the main frame assembly 1, forming a stable support structure. Furthermore, a recliner 23 is installed between the upper and lower connecting plates 21, 22, allowing the backrest frame to swing forward and backward within a certain range, thereby meeting the individual sitting inclination requirements of different passengers.

[0043] The recliner 23 not only affects the accuracy and stability of backrest adjustment but also directly impacts the passenger's riding experience and safety. It utilizes a sophisticated gear transmission mechanism, adjusting the degree of gear meshing to achieve precise control of the backrest angle. The axis of the recliner 23 is tightly connected to the end of the drive shaft 5, ensuring that the drive shaft 5 rotates with the recliner 23, thereby adjusting the backrest angle.

[0044] In order to prevent the transmission shaft 5 from axial movement or falling off during the rotation process, a snap ring 24 is provided on the outer side of the axis of the recliner 23. The snap ring 24, as a connecting piece between the transmission shaft 5 and the axis of the recliner 23, is not only simple and practical, but also highly reliable and durable. The snap ring 24 is made of high-strength, corrosion-resistant material, and its stability and wear resistance during long-term use are ensured through precise processing and heat treatment processes. The inner diameter of the snap ring 24 fits tightly with the end of the transmission shaft 5, and the outer diameter matches the outer side of the axis of the recliner 23, forming a stable connection structure. It not only effectively prevents the transmission shaft 5 from axial movement and falling off during the rotation process, but also improves the stability and reliability of the entire connection assembly 2.

[0045] The connection assembly 2 achieves a stable connection and angle adjustment function between the backrest frame and other parts of the seat through the coordination and optimized design of key components such as the upper connection plate 21, the lower connection plate 22, the adjuster 23 and the clamping ring 24.

[0046] Combine Figure 2 、 Figure 3 、 Figure 4 As shown in the figure, the transmission shaft 5 is a spline shaft.

[0047] Combine Figure 3 、 Figure 4 and Figure 5 As shown, the first limiting bushing 43 , the angle adjuster 23 and the transmission shaft sleeve 33 are all equipped with the same pattern that matches the transmission shaft 5 .

[0048] Specifically, the drive shaft 5 not only affects the efficiency and stability of power transmission but also directly impacts the adjustment accuracy and durability of the entire rear-row, wide-span electric backrest frame. To ensure a tight fit and efficient transmission between the drive shaft 5, the first limiting bushing 43, the recliner 23, and the drive sleeve 33, the outer profile of the drive shaft 5 is designed as a flower-shaped spline shaft.

[0049] The spline shaft design features a unique flower-shaped structure formed by machining a series of evenly distributed key teeth on the outer surface of the transmission shaft 5. This not only increases the contact area between the transmission shaft 5 and the first limiting bushing 43, improving transmission stability and load-bearing capacity, but also enables precise control and positioning of the transmission shaft 5 during rotation through the meshing action of the key teeth.

[0050] In order to match the splines of the transmission shaft 5 , the first limiting bushing 43 , the angle adjuster 23 and the transmission shaft sleeve 33 are all equipped with specially designed identical splines.

[0051] During assembly, the first limiting bushing 43, the recliner 23, and the transmission sleeve 33 are sequentially mounted on the transmission shaft 5 and secured with bolts, pins, or other fasteners. This not only ensures a tight fit and efficient transmission between the transmission shaft 5 and the various components, but also enhances the stability and reliability of the entire transmission system through the meshing action of the key teeth.

[0052] The transmission shaft 5 is designed as a spline shaft with a flower-shaped outer contour, and the first limit bushing 43, the angle adjuster 23 and the transmission shaft sleeve 33 are all equipped with the same flower pattern that matches the spline of the transmission shaft 5. This not only improves the stability and reliability of the transmission system, but also realizes precise control and positioning of the transmission shaft 5 during rotation through precise key tooth engagement.

[0053] Combine Figure 1 and Figure 2 As shown, a lower cross tube assembly 6 is provided between the two lower connecting plates 22 .

[0054] Specifically, the two lower connecting plates 22 not only bear the heavy responsibility of connecting the seat bottom to the vehicle body structure, but also provide a stable mounting platform for the lower cross tube assembly 6. Specifically, the lower cross tube assembly 6 is an ISOFIX lower cross tube assembly 6. It should be noted that ISOFIX (International Standards Organization FIX) is an internationally standardized child seat anchoring system designed to improve the installation convenience and stability of child seats in vehicles, thereby ensuring passenger safety.

[0055] The lower cross tube assembly 6, a key component of the ISOFIX system, takes into account the installation requirements of child seats and the limited interior space of the vehicle. It typically consists of a high-strength metal cross tube and two ISOFIX connection points. The ends of the cross tube are tightly connected to two lower connecting plates 22 via precision-machined connectors, forming a stable support structure. The ISOFIX connection points, located on either side of the cross tube, mate with the ISOFIX connectors on the bottom of the vehicle seat through a specific locking mechanism, enabling a quick and secure connection between the child seat and the vehicle seat.

[0056] The lower cross tube assembly 6, positioned between the two lower connecting plates 22, not only makes the child seat easier to install but also, through its robust support structure, enhances the child seat's stability while the vehicle is in motion. This eliminates the need for parents to use seat belts or other securing devices when installing the child seat. Parents simply align the ISOFIX connector on the child seat's bottom with the connection point on the lower cross tube assembly 6 and tighten, significantly simplifying the installation process and improving efficiency.

[0057] The design of the lower cross tube assembly 6 also fully considers the applicability and compatibility of child seats. Because different brands and models of child seats may have different ISOFIX interface sizes and shapes, the connection points of the lower cross tube assembly 6 are typically adjustable to accommodate different child seat installation requirements. This not only increases the versatility and flexibility of the ISOFIX system, but also provides parents with more options for child seats.

[0058] The lower cross tube assembly 6 provided between the two lower connecting plates 22 not only improves the convenience and stability of the installation of the child seat in the vehicle, but also enhances the versatility and flexibility of the ISOFIX system through its stable support structure and adjustable connection point design.

[0059] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A rear-row electric backrest frame with a large span, comprising a main frame assembly (1), characterized in that: A driving assembly (3) for driving the main frame assembly (1) to adjust an angle is provided on the main frame assembly (1). Connecting assemblies (2) are symmetrically provided on both sides of the main frame assembly (1). The connecting assembly (2) has a horizontal rotation axis. A limiting assembly (4) is provided on the rotation axis. The limiting assembly (4) limits the transmission shaft (5). The output end of the driving assembly (3) is connected to the middle area of ​​the transmission shaft (5).

2. The rear row electric backrest frame with a large span according to claim 1, characterized in that: The drive assembly (3) comprises a motor mounting bracket (31) arranged on the main frame assembly (1); a drive motor (32) is fixedly mounted on one side of the motor mounting bracket (31) by means of bolts; an output end of the drive motor (32) is connected to a transmission shaft sleeve (33); and the transmission shaft sleeve (33) is sleeved on the middle portion of the transmission shaft (5).

3. The rear row electric backrest frame with a large span according to claim 2, characterized in that: The limiting assembly (4) includes a transmission shaft limiting plate (41) fixedly connected to the other side of the motor mounting bracket (31), a hole (42) is provided on the transmission shaft limiting plate (41), the hole (42) is sleeved on the transmission shaft (5), and a first limiting bushing (43) and a second limiting bushing (44) are installed between the transmission shaft (5) and the hole (42).

4. The rear row electric backrest frame with a large span according to claim 3, characterized in that: The first limiting bushing (43) and the second limiting bushing (44) are made of plastic and Teflon respectively.

5. The rear row electric backrest frame with a large span according to claim 3, characterized in that: The connecting assembly (2) comprises an upper connecting plate (21) and a lower connecting plate (22) mounted on both sides of the main frame assembly (1); a recliner (23) is provided at the connection between the upper connecting plate (21) and the lower connecting plate (22); the axis of the recliner (23) is connected to the end of the transmission shaft (5); and a snap ring (24) is provided on the end of the transmission shaft (5) outside the axis of the recliner (23).

6. A rear row electric backrest frame with a large span according to any one of claims 1 to 4, characterized in that: The transmission shaft (5) is a spline shaft.

7. The rear row electric backrest frame with a large span according to claim 6, characterized in that: The first limiting bushing (43), the angle adjuster (23) and the transmission shaft sleeve (33) are all equipped with the same pattern that matches the transmission shaft (5).

8. The rear row electric backrest frame with a large span according to claim 7, characterized in that: A lower transverse pipe assembly (6) is arranged between the two lower connecting plates (22).

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