An adaptive automotive seat power backrest assembly

Abstract

This invention discloses an adaptive electric backrest assembly for automotive seats, relating to the field of automotive parts technology. The adaptive electric backrest assembly includes a backrest frame and an adjustment assembly. The backrest frame includes a left side panel, a right side panel, an upper crossbeam, and a lower crossbeam. The upper ends of the left and right side panels are connected by the upper crossbeam, and the lower ends of the left and right side panels are connected by the lower crossbeam. Gradually distributed reinforcing ribs are provided on both the left and right side panels. This adaptive electric backrest assembly achieves differentiated support characteristics on the left and right sides of the backrest through asymmetrically arranged first and second elastic support bars on the left and right side panels. The first elastic support bar is shorter, has a smaller suspension distance, and a lower first V-shaped limiting segment, allowing for rapid rigid limiting under small loads, providing clear rigid support for the sacral region with its robust skeletal structure.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to an adaptive electric backrest assembly for automotive seats. Background Technology

[0002] As the demand for automotive seat comfort continues to increase, electric backrest assemblies not only need to achieve basic backrest angle adjustment, but also need to provide personalized adaptive support based on the spinal curvature characteristics of occupants of different body types. However, existing electric backrest assemblies still have significant shortcomings in terms of adaptive adjustment capabilities.

[0003] Firstly, existing backrest frames typically employ a symmetrical design for their side panels, with identical reinforcing ribs on both sides, often featuring uniform cross-sections or a uniformly gradient structure. This design results in a linear distribution of stiffness along the backrest height, failing to provide differentiated support based on the stress requirements of different areas of the human spine. Traditional uniform-section reinforcing ribs struggle to create differentiated stiffness responses in different areas such as the lumbar and thoracic vertebrae, leading to insufficient adaptability of the backrest to support occupants of varying body types.

[0004] Secondly, in existing electric backrest assemblies, the backrest motor is typically mounted externally on the side panel surface, which not only occupies internal space but also results in a less compact overall backrest frame structure. More importantly, in the event of a rear-end collision, the externally mounted motor lacks an effective protective structure, posing a safety hazard.

[0005] Third, the adaptive adjustment function of existing backrest assemblies is relatively limited. Some solutions use an airbag-type lumbar support structure, which changes the shape of the backrest support surface by controlling the inflation and deflation of the airbag. However, the response speed of the airbag structure is slow, and it is difficult to achieve precise control of the support force. Another solution uses a mesh frame with a pull cord drive to achieve lumbar support arch adjustment. However, this type of structure usually only achieves adjustment in one direction, which is difficult to meet the needs of occupants of different body types for multi-area and multi-dimensional adaptive support of the backrest.

[0006] Fourth, traditional backrest frames typically include a central support plate to improve overall rigidity. However, the presence of this plate increases the overall weight of the frame, hindering lightweight design of the entire vehicle. Lightweight design of automotive seat frames has become an important development direction.

[0007] In summary, existing electric backrest assemblies still have room for improvement in terms of adaptive support adjustment, ride stability, synergistic optimization of lightweight and high rigidity, and mechanical adaptive fit. There is an urgent need for an electric backrest assembly that provides ride stability, reduces the number of parts in the independent limiting brackets, achieves synergistic optimization of lightweight and high rigidity, and enables the backrest to mechanically adapt to different occupant body shapes in the height direction. Summary of the Invention

[0008] The purpose of this invention is to provide an adaptive electric backrest assembly for automotive seats, which achieves differentiated configuration of support characteristics on the left and right sides of the backrest by asymmetrically arranged first and second elastic support bars on the left and right side panels, and reduces the total weight of the frame by connecting the upper and lower crossbeams, thereby solving the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: an adaptive electric backrest assembly for a car seat, comprising a backrest frame and an adjustment assembly. The backrest frame includes a left side plate, a right side plate, an upper crossbeam, and a lower crossbeam. The upper ends of the left side plate and the right side plate are connected by the upper crossbeam, and the lower ends of the left side plate and the right side plate are connected by the lower crossbeam. Gradually distributed reinforcing ribs are provided on both the left side plate and the right side plate. A first elastic support strip and a second elastic support strip are respectively provided on the side of the left side plate and the right side plate closest to the occupant. The first elastic support strip and the second elastic support strip adopt an asymmetrical structure. The adjustment assembly includes a backrest motor, a synchronizing rod, and an adjuster. The two ends of the synchronizing rod pass through the left side plate and the right side plate respectively and are connected to the adjuster. A backrest connecting plate is connected to the outer side of each adjuster. The backrest motor is installed on the inner side of the left side plate and connected to the synchronizing rod.

[0010] Preferably, the length of the first elastic support bar is less than the length of the second elastic support bar, the suspension distance between the middle part of the first elastic support bar and the surface of the left side panel is less than the suspension distance between the middle part of the second elastic support bar and the surface of the right side panel, the middle part of the first elastic support bar is provided with a first V-shaped limiting section, the middle part of the second elastic support bar is provided with a second V-shaped limiting section, both the first V-shaped limiting section and the second V-shaped limiting section are recessed towards the side away from the occupant, and the installation position of the first V-shaped limiting section on the backrest is lower than the installation position of the second V-shaped limiting section.

[0011] Preferably, the upper end of the second elastic support bar is provided with a right-angle protrusion section, which protrudes upward from the surface of the right side plate, and the height of the right-angle protrusion section is not less than the arch height of the middle part of the second elastic support bar.

[0012] Preferably, both ends of the first elastic support strip are provided with a first sloping transition section, and the angle between the first sloping transition section and the surface of the left side plate is 15°-30°; the lower end of the second elastic support strip is provided with a second sloping transition section, and the angle between the second sloping transition section and the surface of the right side plate is 15°-30°.

[0013] Preferably, the reinforcing rib includes a first reinforcing rib disposed on the left or right side panel near the seat side and a second reinforcing rib disposed on the left or right side panel near the back of the seat side. Both the first and second reinforcing ribs extend from the bottom of the seat toward the shoulder, and the height and width of the first and second reinforcing ribs gradually decrease in the extending direction.

[0014] Preferably, a mounting part is provided on the first reinforcing rib near the bottom of the seat. The depth of the mounting part is half the depth of the adjacent first reinforcing rib. The side of the mounting part near the inside of the seat is used to fix the angle adjuster, and the side of the mounting part near the outside of the seat is fitted with a limit bracket by bolts.

[0015] Preferably, the lower crossbeam is provided with triangular reinforcing ribs at the corners where the left and right side plates connect, and the triangular reinforcing ribs are used to resist torsional loads.

[0016] Preferably, the upper crossbeam is provided with an oblique reinforcing beam, a transverse reinforcing beam and a transverse reinforcing plate. The two ends of the transverse reinforcing beam are welded to the inner wall of the upper crossbeam, and the oblique reinforcing beam is welded to the end position of the transverse reinforcing beam. A triangular stable structure is formed between the oblique reinforcing beam, the transverse reinforcing beam and the upper crossbeam. The transverse reinforcing plate is set at the top of the upper crossbeam, and headrest mounting guides are provided on the upper crossbeam on both sides of the transverse reinforcing plate.

[0017] Preferably, the backrest motor is installed at the connection between the left side panel and the lower crossbeam. The output end of the backrest motor is connected to a reducer. The reducer includes an output shaft sleeve, and a synchronizing rod passes through the output shaft sleeve. The synchronizing rod and the output shaft sleeve are connected by a spline to achieve torque transmission. The rotational torque output by the backrest motor is reduced and amplified by the reducer and then transmitted to the synchronizing rod. The synchronizing rod then transmits the torque synchronously to the two angle adjusters. The two ends of the synchronizing rod are also provided with retaining springs, which abut against the outer end face of the angle adjuster.

[0018] Preferably, the angle adjuster is provided in two symmetrical configurations, with one angle adjuster on each of the left and right side panels. The angle adjuster includes a fixed component, a movable component, and a locking mechanism disposed between the fixed component and the movable component. The fixed component is fixedly connected to the corresponding side panel, and the movable component is fixedly connected to the backrest connecting plate. The backrest connecting plate is provided with an angle limiting notch.

[0019] Compared with existing technologies, the beneficial effects of this invention are as follows: The adaptive electric backrest assembly of this invention achieves differentiated support characteristics on the left and right sides of the backrest through asymmetrically arranged first and second elastic support bars on the left and right side panels. The first elastic support bar is shorter, has a smaller suspension distance, and a lower first V-shaped limiting segment, allowing for rapid rigid limiting under small loads, providing clear rigid support for the sacral region with its solid skeletal structure. The second elastic support bar is longer, has a larger suspension distance, and a higher second V-shaped limiting segment, possessing a greater elastic deformation stroke, providing progressive buffer support—from soft to hard—for the lumbar spine region with thicker soft tissue coverage. The right-angled protrusion at the upper end of the second elastic support bar restricts the occupant's sliding to the right with a non-elastic, non-yielding lateral blocking force, effectively improving ride stability under dynamic conditions.

[0020] The present invention discloses an adaptive electric backrest assembly for automotive seats. Instead of a continuous intermediate support plate between the left and right side panels, the two sides are connected only by an upper and lower crossbeam, reducing the overall weight of the frame. Simultaneously, triangular reinforcing ribs at the corners of the lower crossbeam resist torsional loads. The diagonal reinforcing beams of the upper crossbeam cooperate with the transverse reinforcing beams to form a stable triangular structure. The two ends of the transverse reinforcing beams are welded to the inner wall of the upper crossbeam to form stable support. By eliminating the intermediate support plate, the overall rigidity and torsional resistance of the backrest frame are guaranteed, achieving a synergistic optimization of lightweight and high rigidity.

[0021] The present invention discloses an adaptive electric backrest assembly for a car seat. The first and second reinforcing ribs on the left and right side panels gradually decrease in height and width from the bottom towards the shoulder, so that the upper part of the backrest can elastically shift backward by 0-15mm when compressed, while the middle and lower parts maintain high rigidity support, thereby achieving mechanical adaptive fitting of the backrest to different occupant body shapes in the height direction.

[0022] This invention discloses an adaptive electric backrest assembly for a car seat. A mounting portion is located near the bottom of the seat along the first reinforcing rib. The depth of the mounting portion is half the depth of the adjacent first reinforcing rib, and its edges smoothly connect to both sides of the reinforcing rib, providing a flat mounting reference surface for the angle adjuster while ensuring local strength. A limiting bracket is bolted to the side of the mounting portion near the outside of the seat, cooperating with the angle limiting notch on the backrest connecting plate to achieve maximum and minimum angle limiting. The limiting structure is integrated with the reinforcing rib, reducing the number of parts required for independent limiting brackets. Attached Figure Description

[0023] Figure 1 This is a first-view view of the adaptive electric backrest assembly for automotive seats of the present invention; Figure 2 This is a second-view view of the adaptive electric backrest assembly for automotive seats according to the present invention; Figure 3 This is a structural diagram of the left side plate of the present invention; Figure 4 This is a cross-sectional view (AA) of the present invention; Figure 5 This is a structural diagram of the right side plate of the present invention; Figure 6 This is a front view of the adaptive electric backrest assembly for automobile seats according to the present invention; Figure 7 This is a connection structure diagram of the backrest motor, synchronizing rod, and angle adjuster of the present invention; Figure 8 This is a BB cross-sectional view of the present invention.

[0024] In the diagram: 1. Left side panel; 11. First elastic support bar; 111. First ramp transition section; 112. First V-shaped limiting section; 13. First reinforcing rib; 131. Mounting part; 132. Limiting frame; 14. Second reinforcing rib; 2. Right side panel; 21. Second elastic support bar; 211. Second ramp transition section; 212. Second V-shaped limiting section; 213. Right-angle protrusion section; 3. Upper crossbeam; 31. Diagonal reinforcing beam; 32. Transverse reinforcing beam; 33. Transverse reinforcing plate; 34. Headrest mounting guide tube; 4. Lower crossbeam; 41. Triangular reinforcing rib; 5. Backrest motor; 51. Reducer; 6. Synchronizing rod; 61. External spline; 62. Snap ring; 7. Angle adjuster; 71. Fixing component; 72. Moving component; 73. Locking mechanism; 8. Backrest connecting plate; 81. Angle limiting notch. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-8An adaptive electric backrest assembly for a car seat includes a backrest frame and an adjustment assembly. The backrest frame includes a symmetrically arranged left side panel 1 and right side panel 2, and an upper crossbeam 3 and a lower crossbeam 4 connecting the left side panel 1 and the right side panel 2. The adjustment assembly includes a backrest motor 5, a synchronizing rod 6, and an adjuster 7. The two ends of the synchronizing rod 6 pass through the left side panel 1 and the right side panel 2 respectively and are connected to the adjuster 7. A backrest connecting plate 8 is provided at the end of the synchronizing rod 6 located outside the left side panel 1 and the right side panel 2. The backrest motor 5 is installed on the inner side of the left side panel 1 and connected to the synchronizing rod 6. It should be noted that the installation positions of the left side panel 1 and the right side panel 2 in this application are opposite to the left and right hand directions of the driver and passenger after they are seated. Specifically, the left side panel 1 corresponds to the left hand direction of the passenger, and the right side panel 2 corresponds to the right hand direction of the passenger.

[0027] Specifically, both the left side panel 1 and the right side panel 2 are irregular shell-shaped structures. The right side panel 2 has the same structure as the left side panel 1, and the right side panel 2 and the left side panel 1 are symmetrically arranged about the center line of the seat. Both the left side panel 1 and the right side panel 2 are provided with gradient-distributed reinforcing ribs. The difference is that the left side panel 1 and the right side panel 2 are respectively provided with a first elastic support strip 11 and a second elastic support strip 21 on the side closer to the occupant. The first elastic support strip 11 and the second elastic support strip 21 adopt an asymmetrical structure.

[0028] Furthermore, the reinforcing ribs include a first reinforcing rib 13 disposed on the left side panel 1 or the right side panel 2 near the side of the seat, and a second reinforcing rib 14 disposed on the left side panel 1 or the right side panel 2 near the back of the seat. Both the first reinforcing rib 13 and the second reinforcing rib 14 extend from the bottom of the seat toward the shoulder, and the height and width of the first reinforcing rib 13 and the second reinforcing rib 14 gradually decrease in the direction of extension. When occupants of different weights lean against the seat back, the upper area can elastically shift backward by 0-15mm when subjected to pressure, while the middle and lower areas maintain high rigidity support, thereby achieving mechanical adaptive fit of the backrest to the occupant's body shape.

[0029] It should be understood that the first reinforcing rib 13 is provided with a mounting part 131 near the bottom of the seat. The two sides of the edge of the mounting part 131 are smoothly connected to the two sides of the first reinforcing rib 13. The depth of the first reinforcing rib 13 is greater than that of the mounting part 131. The depth of the mounting part 131 is half the depth of the adjacent first reinforcing rib 13. The side of the mounting part 131 near the inside of the seat is used to fix the angle adjuster 7. The side of the mounting part 131 near the outside of the seat is bolted to install a limit bracket 132. The limit bracket 132 rotates with the seat back and limits the maximum and minimum rotation angle of the seat back.

[0030] More specifically, the first elastic support strip 11 and the second elastic support strip 21 are asymmetrically configured in terms of length, end structure, suspension distance, and the position of the limiting recess. Specifically: The length of the first elastic support bar 11 is less than the length of the second elastic support bar 21. The longer second elastic support bar 21 provides a larger support span for the right side of the occupant, effectively dispersing lateral loads and preventing local stress concentration on the right side of the backrest. Both the first elastic support bar 11 and the second elastic support bar 21 are fixed at both ends. The first elastic support bar 11 has a first sloping transition section 111 at both ends, which smoothly rises from the surface of the left side plate 1 towards the middle of the first elastic support bar 11. The angle between the first sloping transition section 111 and the surface of the left side plate 1 is 15°-30°. The lower end of the second elastic support bar 21 has a second sloping transition section 211, which smoothly rises from the surface of the right side plate 2 towards the middle of the second elastic support bar 21. The angle between the second sloping transition section 211 and the surface of the right side plate 2 is 15°-30°. The upper end of the second elastic support bar 21 has a right-angle protrusion section 213, which protrudes upwards from the surface of the right side plate 2, and intersects with the right side plate 2. The included angle of the surface of plate 2 is 85°-95°. The height of the right-angle protrusion 213 is not lower than the arch height of the middle part of the second elastic support bar 21. The first slope transition section 111 makes the stress at both ends of the first elastic support bar 11 transition evenly when it is under pressure, avoiding stress concentration. The second slope transition section 211 ensures the welding strength between the bottom of the second elastic support bar 21 and the right side plate 2, while allowing elastic deformation to be gradually transmitted from bottom to top. The right-angle protrusion 213 forms an anti-slip block. Its protrusion height is not lower than the arch height of the middle part of the elastic support bar. When the occupant's body is squeezed to the right when the vehicle is turning, the right-angle protrusion 213 will first contact the occupant's back, providing the occupant with non-elastic, non-yielding lateral blocking force to prevent the occupant from sliding to the right, playing the role of lateral support and limiting. The middle part of the first elastic support bar 11 and the second elastic support bar 21 arches and hangs in the air towards the occupant side, forming an elastic deformation zone. The suspension distance between the middle part of the first elastic support bar 11 and the surface of the left side panel 1 is smaller than the suspension distance between the middle part of the second elastic support bar 21 and the surface of the right side panel 2. The first elastic support bar 11 contacts the left side panel 1 under a small load, ensuring the structural rigidity of the left side of the seat. The second elastic support bar 21 has a larger elastic travel, which, together with the installation position of the seat belt, provides more sufficient cushioning and progressive support when the vehicle is turning. The first elastic support bar 11 has a first V-shaped limiting section 112 in its middle part, and the second elastic support bar 21 has a second V-shaped limiting section 212 in its middle part. Both the first V-shaped limiting section 112 and the second V-shaped limiting section 212 are recessed towards the side away from the occupant. The V-shaped limiting section is composed of two obliquely bent sections that are symmetrical or asymmetrical with respect to the length direction of the elastic support bar, and the opening of the V-shape faces the occupant side. When the elastic support bar is in a free state, there is a preset gap between the bottom of the V-shaped limiting section and the surface of the side plate. When the elastic support bar bears a load and undergoes elastic deformation, the bottom of the V-shaped limiting section first contacts the side plate surface. As the load increases, the two obliquely bent sections gradually adhere to the side plate surface until they are completely flattened to achieve rigid limiting. The installation position of the first V-shaped limiting section 112 on the backrest is lower than the installation position of the second V-shaped limiting section 212. The first V-shaped limiting section 112 is located in the sacrum or coccyx region, which is suitable for providing rigid limiting support. The second V-shaped limiting section 212 is located in the lumbar region, which is highly sensitive to pressure and is suitable for providing elastic buffer support.

[0031] It should be understood that in this application, there is no continuous intermediate support plate between the left side plate 1 and the right side plate 2. The left side plate 1 and the right side plate 2 are connected by an upper crossbeam 3 and a lower crossbeam 4. The lower crossbeam 4 is provided with triangular reinforcing ribs 41 near the corner where the left side plate 1 and the right side plate 2 are connected. The triangular reinforcing ribs 41 are used to resist torsional loads. At the same time, the upper crossbeam 3 is provided with an oblique reinforcing beam 31, a transverse reinforcing beam 32 and a transverse reinforcing plate 33. The two ends of the transverse reinforcing beam 32 are welded to the inner wall of the upper crossbeam 3. A stable support is formed at the opening. The oblique reinforcing beam 31 is welded to the end of the transverse reinforcing beam 32, forming a triangular stable structure between the upper crossbeam 3 and the transverse reinforcing beam 32. The transverse reinforcing plate 33 is set at the top of the upper crossbeam 3. Headrest mounting guides 34 are set on the upper crossbeam 3 on both sides of the transverse reinforcing plate 33. The transverse reinforcing plate 33 widens the top of the upper crossbeam 3. After the transverse reinforcing plate 33 is covered with foam and back cover, the transverse reinforcing plate 33 can support the area below the occupant's neck.

[0032] Furthermore, the lower crossbeam 4 is a hollow shell structure with discontinuous welding surfaces at both ends. The lower crossbeam 4 is welded to the outside of the left side plate 1 and the right side plate 2 through the welding surfaces. The discontinuous welding surfaces form a gap at the welding points of the lower crossbeam 4 with the left side plate 1 and the right side plate 2, which facilitates the inspection and maintenance of the backrest without affecting the protection strength of the backrest motor 5 inside the lower crossbeam 4.

[0033] It is also important to understand that there are two symmetrical angle adjusters 7. The output end of the backrest motor 5 is connected to a reducer 51. The output end of the reducer 51 is connected to a synchronizing rod 6. The two ends of the synchronizing rod 6 are respectively connected to the input ends of the two angle adjusters 7. The rotational torque output by the backrest motor 5 is reduced and increased by the reducer 51 and then transmitted to the synchronizing rod 6. The synchronizing rod 6 then transmits the torque synchronously to the two angle adjusters 7 to realize the electric adjustment of the backrest angle.

[0034] Specifically, the backrest motor 5 is fixedly installed at the connection between the left side plate 1 and the lower crossbeam 4, and is enclosed by the lower crossbeam 4 and the left side plate 1. A worm gear is fixedly installed on the output shaft of the backrest motor 5, and the worm gear extends into the housing of the reducer 51. The reducer 51 includes a worm wheel and a planetary gear set. The worm wheel is movably connected to the reducer 51 housing and meshes with the worm gear. A drive shaft is eccentrically mounted on the worm wheel. The planetary gear set is mounted on the drive shaft. The output torque of the backrest motor 5 is output after two-stage reduction through the worm gear, worm wheel, and planetary gear set. The reducer 51 also includes an output shaft sleeve, which is movably connected to the housing of the reducer 51. The inner wall of the output shaft sleeve is provided with an internal spline. The output end of the planetary gear set is fixedly connected to the output shaft sleeve. The synchronizing rod 6 passes through the output shaft sleeve, and the outer wall of the synchronizing rod 6 is provided with an external spline 61 that matches the internal spline. The synchronizing rod 6 and the output shaft sleeve are connected by a spline. To achieve torque transmission, each of the left and right side plates 1 and 2 is equipped with an adjuster 7. Each adjuster 7 includes a fixed part 71, a movable part 72, and a locking mechanism 73 disposed between the fixed part 71 and the movable part 72. The fixed part 71 is fixedly connected to the corresponding side plate, and the movable part 72 is fixedly connected to the backrest connecting plate 8. Each adjuster 7 has a through hole in the center, and the inner wall of the through hole is provided with an internal spline. The two ends of the synchronizing rod 6 pass through the through holes of the two adjusters 7 respectively, and the external splines 61 at both ends of the synchronizing rod 6 cooperate with the internal splines of the through holes. The ends of the synchronizing rod 6 are also provided with retaining springs 62, which abut against the outer end face of the adjuster 7 to limit the axial movement of the synchronizing rod 6. In addition, the backrest connecting plate 8 is provided with an angle limiting notch 81, and the limiting frame 132 moves at the angle limiting notch 81 to limit the maximum and minimum rotation angle of the backrest.

[0035] Working process: When the seat back assembly is in a static locked state, the adjustment components are not working. The occupant leans against the backrest, and the load is transferred sequentially through the back cover and foam to the backrest assembly. Because the left side panel 1 and the right side panel 2 are respectively provided with an asymmetrical structure of the first elastic support bar 11 and the second elastic support bar 21 on the side closest to the occupant, the backrest assembly achieves differentiated adaptive support for the occupant's body shape under static seating conditions. The left side of the body corresponds to the first elastic support bar 11. The first elastic support bar 11 undergoes slight elastic deformation under the occupant's weight. The first sloping transition section 111 evenly distributes the stress along both ends, avoiding local stress concentration. The bottom of the first V-shaped limiting section 112 contacts the surface of the left side panel 1 first, and the two sloping bending sections of the V-shaped opening begin to gradually... As the load gradually conforms to the surface of the left side plate 1, the limiting effect intervenes early. The first V-shaped limiting segment 112 is completely flattened, and the deformation of the first elastic support strip 11 terminates. The load is directly transferred to the body of the left side plate 1 through the V-shaped limiting segment, providing clear rigid limiting support for the occupant's sacrum or coccyx region, preventing excessive collapse on the left side of the occupant. The right side of the body corresponds to the second elastic support strip 21. The second elastic support strip 21 undergoes elastic deformation under the occupant's weight. The second sloping transition segment 211 ensures that the elastic deformation is gradually transferred from bottom to top. The right-angle protrusion segment 213 first contacts the occupant's back, providing initial lateral support. The second elastic support strip 21 continues to undergo elastic deformation within a larger range, providing a longer elastic buffer stroke for the lumbar region. When the deformation reaches... When the second V-shaped limiting segment 212 reaches its preset gap, the bottom of the second V-shaped limiting segment 212 contacts the surface of the right side plate 2, and begins to transition to rigidity. The second V-shaped limiting segment 212 is completely flattened, deformation ends, and the load is transferred to the right side plate 2. The lumbar region obtains final rigid support. When the vehicle turns left, the occupant is squeezed to the right under the action of centrifugal force. The right-angle protrusion segment 213 first contacts the occupant's back, restricting the occupant's sliding to the right, and plays a role in auxiliary lateral support and limiting. The height and width of the first reinforcing rib 13 and the second reinforcing rib 14 gradually decrease from the bottom to the shoulder direction, so that the upper part of the backrest can produce 0-15mm of elastic backward displacement when compressed, while the middle and lower parts maintain high rigidity support, realizing the mechanical support of the backrest in the height direction. The mechanical adaptive fit is achieved when the occupant operates the electric adjustment switch. The backrest motor 5 is powered on and runs. Its output torque is reduced and amplified by the two-stage reduction gear 51, and then synchronously drives the left and right angle adjusters 7 to unlock through the synchronous rod 6. This causes the backrest to rotate around the rotation center of the angle adjuster 7, thereby achieving angle adjustment. During the rotation of the backrest, the limit bracket 132 fixed on the mounting part 131 rotates together with the backrest connecting plate 8. The limit bracket 132 slides within the angle limiting notch 81 on the backrest connecting plate 8. When the backrest rotates to the maximum or minimum design angle, the limit bracket 132 abuts against the corresponding end of the angle limiting notch 81, preventing the backrest from continuing to rotate, thereby limiting the maximum and minimum rotation angle of the backrest and avoiding damage to the adjustment components due to overtravel.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adaptive electric backrest assembly for automotive seats, comprising a backrest frame and an adjustment assembly, characterized in that, The backrest frame includes a left side plate (1), a right side plate (2), an upper crossbeam (3), and a lower crossbeam (4). The upper ends of the left side plate (1) and the right side plate (2) are connected by the upper crossbeam (3), and the lower ends of the left side plate (1) and the right side plate (2) are connected by the lower crossbeam (4). The left side plate (1) and the right side plate (2) are provided with gradient-distributed reinforcing ribs. The left side plate (1) and the right side plate (2) are respectively provided with a first elastic support bar (11) and a second elastic support bar (21) on the side closer to the occupant. The first elastic support bar (11) and the second elastic support bar (21) adopt an asymmetrical structure. The adjustment component includes a backrest motor (5), a synchronizing rod (6), and an angle adjuster (7). The two ends of the synchronizing rod (6) pass through the left side plate (1) and the right side plate (2) respectively, and are connected to the angle adjuster (7). The backrest connecting plate (8) is connected to the outside of each angle adjuster (7). The backrest motor (5) is installed on the inside of the left side plate (1) and is connected to the synchronizing rod (6).

2. The adaptive electric backrest assembly for automotive seats according to claim 1, characterized in that, The length of the first elastic support bar (11) is less than the length of the second elastic support bar (21). The distance between the middle part of the first elastic support bar (11) and the surface of the left side panel (1) is less than the distance between the middle part of the second elastic support bar (21) and the surface of the right side panel (2). The middle part of the first elastic support bar (11) is provided with a first V-shaped limiting section (112), and the middle part of the second elastic support bar (21) is provided with a second V-shaped limiting section (212). Both the first V-shaped limiting section (112) and the second V-shaped limiting section (212) are recessed to the side away from the occupant. The installation position of the first V-shaped limiting section (112) on the backrest is lower than the installation position of the second V-shaped limiting section (212).

3. The adaptive electric backrest assembly for automotive seats according to claim 2, characterized in that, The upper end of the second elastic support bar (21) is provided with a right-angle protrusion section (213). The right-angle protrusion section (213) protrudes upward from the surface of the right side plate (2). The height of the right-angle protrusion section (213) is not lower than the arch height of the middle part of the second elastic support bar (21).

4. The adaptive electric backrest assembly for automotive seats according to claim 2, characterized in that, Both ends of the first elastic support bar (11) are provided with a first ramp transition section (111), and the angle between the first ramp transition section (111) and the surface of the left side plate (1) is 15°-30°; the lower end of the second elastic support bar (21) is provided with a second ramp transition section (211), and the angle between the second ramp transition section (211) and the surface of the right side plate (2) is 15°-30°.

5. The adaptive electric backrest assembly for automotive seats according to claim 1, characterized in that, The reinforcing ribs include a first reinforcing rib (13) disposed on the left side plate (1) or the right side plate (2) near the side of the seat and a second reinforcing rib (14) disposed on the left side plate (1) or the right side plate (2) near the back of the seat. Both the first reinforcing rib (13) and the second reinforcing rib (14) extend from the bottom of the seat toward the shoulder, and the height and width of the first reinforcing rib (13) and the second reinforcing rib (14) gradually decrease in the direction of extension.

6. The adaptive electric backrest assembly for automotive seats according to claim 5, characterized in that, The first reinforcing rib (13) has an installation part (131) near the bottom of the seat. The depth of the installation part (131) is half the depth of the adjacent first reinforcing rib (13). The side of the installation part (131) near the inside of the seat is used to fix the angle adjuster (7). The side of the installation part (131) near the outside of the seat is fitted with a limit bracket (132) by bolts.

7. The adaptive electric backrest assembly for automotive seats according to claim 1, characterized in that, The lower crossbeam (4) is provided with triangular reinforcing ribs (41) at the corners where the left side plate (1) and the right side plate (2) meet. The triangular reinforcing ribs (41) are used to resist torsional loads.

8. An adaptive electric backrest assembly for automotive seats according to claim 7, characterized in that, The upper crossbeam (3) is provided with an oblique reinforcing beam (31), a transverse reinforcing beam (32) and a transverse reinforcing plate (33). The two ends of the transverse reinforcing beam (32) are welded to the inner wall of the upper crossbeam (3). The oblique reinforcing beam (31) is welded to the end of the transverse reinforcing beam (32). A triangular stable structure is formed between the oblique reinforcing beam (31), the transverse reinforcing beam (32) and the upper crossbeam (3). The transverse reinforcing plate (33) is set at the top of the upper crossbeam (3). Headrest mounting guide tubes (34) are provided on the upper crossbeam (3) on both sides of the transverse reinforcing plate (33).

9. An adaptive electric backrest assembly for automotive seats according to claim 1, characterized in that, The backrest motor (5) is installed at the connection between the left side plate (1) and the lower crossbeam (4). The output end of the backrest motor (5) is connected to a reducer (51). The reducer (51) includes an output shaft sleeve. A synchronizing rod (6) passes through the output shaft sleeve. The synchronizing rod (6) and the output shaft sleeve are connected by a spline to achieve torque transmission. The rotational torque output by the backrest motor (5) is reduced and increased by the reducer (51) and then transmitted to the synchronizing rod (6). The synchronizing rod (6) then transmits the torque synchronously to the two angle adjusters (7). The ends of the synchronizing rod (6) are also provided with snap rings (62). The snap rings (62) abut against the outer end face of the angle adjuster (7).

10. An adaptive electric backrest assembly for automotive seats according to claim 9, characterized in that, The angle adjuster (7) is provided in two symmetrical positions, with one angle adjuster (7) on each of the left side plate (1) and the right side plate (2). The angle adjuster (7) includes a fixed part (71), a movable part (72), and a locking mechanism (73) provided between the fixed part (71) and the movable part (72). The fixed part (71) is fixedly connected to the corresponding side plate, and the movable part (72) is fixedly connected to the backrest connecting plate (8). The backrest connecting plate (8) is provided with an angle limiting notch (81).

Images