Adjustable seat cushion structure and seat

Abstract

An adjustable seat cushion structure and a seat. The seat cushion structure comprises a seat frame assembly (2), a base assembly (3) and a link rod drive assembly (4), the seat frame assembly (2) comprising two seat frame side plates (22) arranged opposite to each other, and the link rod drive assembly (4) comprising a first rear link rod (42a) and drive motor assemblies. The first rear link rod (42a) is located on the outer side of a seat frame side plate (22), the lower end of the first rear link rod (42a) is rotatably connected to the base assembly (3), and the upper end of the first rear link rod (42a) is rotatably arranged relative to the seat frame assembly (2). Each drive motor assembly comprises a motor (43) and a gear (44) which are respectively mounted on the inner and outer sides of a seat frame side plate (22), and an output shaft of the motor (43) passes through the corresponding seat frame side plate (22) and is fixedly connected to the gear (44); the first rear link rod (42a) is provided with arc-shaped extending teeth (42c), the teeth (42c) being meshed with the gear (44); and the motor (43) is used for driving, by means of the gear (44), the first rear link rod (42a) to drive the seat frame assembly (2) to move back and forth relative to the base assembly (3). The seat cushion structure has a large adjustable range and features compact structure and low costs.

Description

Adjustable seat cushion structure and seat Technical Field

[0001] This invention relates to the field of automotive seat technology, and in particular to an adjustable seat cushion structure and seat. Background Technology

[0002] As an important component of a car, car seats, in addition to their function of providing seating, are usually equipped with a backrest that can be flipped forward and folded down to meet needs such as obtaining more trunk space.

[0003] To accommodate the lumbar curve of passengers, the backrests of existing car seats are typically designed with a forward-protruding arc-shaped connecting plate, which acts as a side wing to enhance lumbar support. However, when the backrest is folded forward, the foam corresponding to this arc-shaped area of ​​the connecting plate presses against the seat cushion foam, limiting the forward rotation angle of the backrest. Although existing car seat cushions can achieve some height and angle adjustment via linkages and drive mechanisms, these adjustments are almost entirely limited to basic comfort needs and have a small range. Even when the seat cushion is adjusted to its lowest position, it still cannot completely avoid the arc-shaped area of ​​the connecting plate, preventing the backrest from fully flattening and reducing the effectiveness of the forward folding mechanism.

[0004] To address the aforementioned issues, some car seats have replaced the drive mechanism with an adjuster. The adjuster's angle-driven action on the rear or front linkage of the linkage mechanism allows for a wider range of motion, enabling the seat cushion to completely avoid the protruding parts of the backrest and thus achieve a flat backrest. For example, published patent CN117621957A uses a rear linkage adjuster with angle drive, and published patent CN117183847A uses a front linkage adjuster with angle drive. While these structures using adjusters to drive the linkage mechanism increase the range of motion and solve the problem of the backrest not being able to flatten, the adjusters are expensive and space-consuming, especially concentric adjusters, while eccentric adjusters have poor rotation smoothness. Therefore, a more economical, space-saving seat cushion structure with a wide range of adjustments is needed. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides an adjustable seat cushion structure and seat that allows for a wider range of adjustment of the seat cushion, enabling the backrest to be laid flat when folded forward. It is also more economical, compact, and space-saving than an adjustable seat adjustment mechanism.

[0006] This invention is achieved through the following scheme: an adjustable seat cushion structure, including a seat frame assembly, a base assembly, and a linkage drive assembly. The seat frame assembly includes two seat frame side plates arranged opposite each other. The linkage drive assembly includes a first rear linkage and a drive motor assembly. The first rear linkage is located on the opposite outer side of one of the seat frame side plates, and its lower end is rotatably connected to the base assembly. Its upper end is rotatably arranged relative to the seat frame assembly. The drive motor assembly includes a motor mounted on the opposite inner side of the seat frame side plate corresponding to the first rear linkage and a gear mounted on the opposite outer side of the seat frame side plate corresponding to the motor. The output shaft of the motor passes through the corresponding seat frame side plate and is fixedly connected to the gear. The first rear linkage has arc-shaped teeth that mesh with the gear. The motor drives the first rear linkage via the gear to drive the seat frame assembly to move back and forth relative to the base assembly.

[0007] A further improvement of the present invention is that the linkage drive assembly further includes a second rear linkage, the second rear linkage is located on the opposite outer side of another seat frame side plate, and the upper end of the second rear linkage is rotatably disposed relative to the seat frame assembly, and the lower end is rotatably connected to the base assembly. The axis of rotation of the second rear linkage relative to the seat frame assembly is the same as the axis of rotation of the first rear linkage relative to the seat frame assembly.

[0008] A further improvement of the present invention is that: the second rear link is provided with another tooth, and another seat frame side plate is equipped with another drive motor assembly corresponding to the second rear link. The motor of the other drive motor assembly drives the second rear link and the first rear link together to drive the seat frame assembly to move back and forth relative to the base assembly through the corresponding gear.

[0009] A further improvement of the present invention is that: the upper end of the seat frame side plate on which the drive motor assembly is installed is provided with a side plate flange for covering the corresponding tooth.

[0010] A further improvement of the present invention is that the sector angle corresponding to the tooth is in the range of 150° to 250°.

[0011] A further improvement of the present invention is that a rear horizontal tube is rotatably connected between the two seat frame side plates, and both ends of the rear horizontal tube pass through the two seat frame side plates and are respectively fixedly connected to the upper ends of the first rear connecting rod and the second rear connecting rod, or...

[0012] A rear horizontal tube is fixedly connected between the two seat frame side plates. Both ends of the rear horizontal tube pass through the two seat frame side plates and are rotatably connected to the upper ends of the first rear connecting rod and the second rear connecting rod, respectively.

[0013] The upper ends of the first and second rear connecting rods are respectively rotatably connected to the two seat frame side plates by riveting / step bolts.

[0014] A further improvement of the present invention is that: the base assembly includes two parallel slide rail assemblies, two fixed brackets connected to the relatively inner sides of the two slide rail assemblies, and two rear fixed plates connected to the relatively outer sides of the two slide rail assemblies; the lower ends of the first rear connecting rod and the second rear connecting rod are respectively rotatably connected to the two fixed brackets; and the two rear fixed plates are used to support the backrest assembly.

[0015] A further improvement of the present invention is that the linkage drive assembly further includes two front linkages, the upper ends of the two front linkages are rotatably disposed relative to the seat frame assembly, the lower ends of the two front linkages are respectively rotatably connected to the two fixed brackets, and the axis of rotation of the front linkages relative to the seat frame assembly is parallel to the axis of rotation of the first rear linkage relative to the seat frame assembly.

[0016] A further improvement of the present invention is that a front cross tube is rotatably connected between the two seat frame side plates, and the upper ends of the two front connecting rods are fixedly connected to the front cross tube.

[0017] A further improvement of the present invention is that the linkage drive assembly further includes two front linkages, the upper ends of the two front linkages are rotatably disposed relative to the seat frame assembly, and the lower ends of the two front linkages are rotatably connected to the base assembly.

[0018] A further improvement of the present invention is that a front cross tube is rotatably connected between the two seat frame side plates, and the upper ends of both front connecting rods are fixedly connected to the front cross tube, or...

[0019] A front cross tube is fixedly connected between the two seat frame side plates, and the upper ends of both front connecting rods are rotatably connected to the front cross tube, or...

[0020] The upper ends of the two front connecting rods are rotatably connected to the two seat frame side plates by riveting / step bolts.

[0021] A further improvement of the present invention is that: through holes are provided on the side plate of the seat frame for bolts to pass through, and each bolt is fixedly connected to the motor after passing through the corresponding through hole. A limiting groove is provided on the first rear connecting rod, and one of the bolts acts as a limiting post and cooperates with the limiting groove to limit the rotation range of the first rear connecting rod relative to the seat frame assembly.

[0022] The present invention also provides a seat, including a backrest assembly and an adjustable seat cushion structure as described above, the backrest assembly being rotatably connected to the base assembly and configured such that, when the seat frame assembly moves forward relative to the base assembly, the backrest assembly rotates forward relative to the base assembly to form a folded state with the seat frame assembly.

[0023] This invention includes, but is not limited to, the following beneficial effects:

[0024] 1. The seat adopts a seat-back separation structure, which can achieve forward folding of the backrest. It uses a toothed linkage and gears to drive the seat cushion adjustment through a motor, so that the seat cushion structure can achieve a wider range of adjustment, including height adjustment, and can be laid flat when the backrest is folded forward and can achieve zero pressure mode when the backrest is reclined backward. It is also more economical than the angle adjustment device.

[0025] 2. The seat adopts a seat-back separation structure, which requires a higher longitudinal height and stronger strength for the rear fixing plate connected to the backrest assembly. Therefore, the space on the outer side of the seat frame side plate is compressed. By arranging the teeth on the outer side of the seat frame side plate and the motor on the inner side of the seat frame side plate, the overall structure of the seat cushion is made compact and occupies less space. It also avoids the teeth cutting the seat cushion foam when the seat cushion moves forward, thereby increasing the thickness of the rear end of the seat cushion foam. At the same time, it can make way for the rear fixing plate in the Y direction, so that the rear fixing plate can extend forward to increase the support strength for the backrest assembly.

[0026] 3. Driven by the cooperation of gears and teeth, the teeth can rotate coaxially with the rear cross tube, making the seat adjustment process smoother. Furthermore, the large fan-shaped angle setting of the teeth allows the seat to be adjusted to more different positions to meet the different needs of passengers.

[0027] 4. By arranging the drive device on both sides, the locking strength of the seat adjustment is higher, which can be used in scenarios with higher strength requirements. Attached Figure Description

[0028] Figure 1 shows a perspective view of the first embodiment of the cushion structure of the present invention.

[0029] Figure 2 shows a schematic diagram of the assembly of the linkage drive assembly and the base assembly in the first embodiment of the seat structure of the present invention.

[0030] Figure 3 shows a schematic diagram of the assembly of the seat frame assembly and the front linkage in the first embodiment of the seat cushion structure of the present invention.

[0031] Figure 4 shows a schematic diagram of the assembly state of the rear end of the seat frame assembly and the rear connecting rod in the first embodiment of the seat cushion structure of the present invention.

[0032] Figure 5 shows an exploded view of the structure shown in Figure 4.

[0033] Figure 6 shows a cross-sectional view of the structure shown in Figure 4.

[0034] Figure 7 shows an enlarged view of section B of the structure shown in Figure 6.

[0035] Figure 8 shows an enlarged view of point C in the structure shown in Figure 6.

[0036] Figure 9 shows an assembly diagram of the base assembly in the first embodiment of the cushion structure of the present invention.

[0037] Figure 10 shows a schematic diagram of the tooth distribution range in the first embodiment of the cushion structure of the present invention.

[0038] Figure 11 shows a schematic diagram of the engagement state of the teeth and gears during the adjustment process of the first embodiment of the seat structure of the present invention.

[0039] Figure 12 shows a schematic diagram of the engagement state of the teeth and gears when the first embodiment of the seat cushion structure of the present invention is adjusted to the highest position.

[0040] Figure 13 shows a schematic diagram of the engagement state of the teeth and gears when the first embodiment of the seat structure of the present invention is adjusted to the lowest position.

[0041] Figure 14 shows a three-dimensional structural diagram of the first embodiment of the seat cushion structure of the present invention when it is adjusted to the lowest position.

[0042] Figure 15 shows an enlarged view of point D in the structure shown in Figure 14.

[0043] Figure 16 shows a three-dimensional structural diagram of the first embodiment of the seat cushion structure of the present invention when it is adjusted forward to the lowest position.

[0044] Figure 17 shows a schematic diagram of the engagement state of the teeth and gears when the first embodiment of the seat structure of the present invention is adjusted forward to the lowest position.

[0045] Figure 18 shows a three-dimensional structural schematic diagram of the backrest assembly in an embodiment of the seat of the present invention.

[0046] Figure 19 shows a three-dimensional structural diagram of a seat assembly using the first embodiment of the seat cushion structure of the present invention in an unfolded state.

[0047] Figure 20 shows a three-dimensional structural diagram of a seat assembly using the first embodiment of the seat cushion structure of the present invention in a folded state.

[0048] Figure 21 shows a schematic diagram of the tooth distribution range in the second embodiment of the cushion structure of the present invention.

[0049] Figure 22 shows a three-dimensional structural diagram of the second embodiment of the seat cushion structure of the present invention when it is adjusted to the lowest position.

[0050] Figure 23 shows a schematic diagram of the engagement state of the teeth and gears during the adjustment process of the second embodiment of the seat structure of the present invention.

[0051] Figure 24 shows a schematic diagram of the engagement state of the teeth and gears when the second embodiment of the seat cushion structure of the present invention is adjusted to the lowest position.

[0052] Figure 25 shows a partially exploded three-dimensional structural diagram of the third embodiment of the cushion structure of the present invention.

[0053] In the diagram: 1. Backrest assembly; 11. Lower backrest connecting plate; 12. Upper backrest connecting plate; 2. Seat frame assembly; 21. Seat tray; 22. Seat frame side plate; 221. Side plate flange; 222. First mounting hole; 223. Third mounting hole; 224. Through hole; 23. Front cross tube; 231. First riveting bushing; 24. Rear cross tube; 241. Power spring and fixing center; 242. Limiting retaining ring; 243. Second riveting bushing; 25. 1. Motor bracket; 251. Limiting post; 26. Front lower cross tube; 27. Leg support bracket; 3. Base assembly; 31. Slide rail assembly; 32. Fixed bracket; 33. Rear fixing plate; 34. Rear reinforcing cross tube; 4. Linkage drive assembly; 41. Front link; 42a. First rear link; 42b. Second rear link; 42c. Gear; 42d. Limiting groove; 42e. Second mounting hole; 43. Motor; 44. Gear; 5. Clearance space. Detailed Implementation

[0054] To address the problems of limited adjustment range, inability to allow the backrest to fold forward and lie flat, and high cost and large space occupation of adjusting the seat using an angle adjuster, this invention provides an adjustable seat structure and seat. The adjustable seat structure and seat will be further described below with reference to specific embodiments and accompanying drawings.

[0055] Referring to Figures 1 to 20, the figures show a first embodiment of an adjustable seat cushion structure and a seat embodiment with the adjustable seat cushion structure. The adjustable seat cushion structure in this embodiment includes a seat frame assembly 2, a base assembly 3, and a linkage drive assembly 4. The seat frame assembly 2 includes two opposing seat frame side plates 22, and a seat basin 21 for occupants is typically fixedly connected between the two seat frame side plates 22. The linkage drive assembly 4 includes a first rear linkage 42a and a drive motor assembly; wherein the first rear linkage 42a is located on the opposite outer side of one of the seat frame side plates 22. The lower end of the first rear connecting rod 42a is rotatably connected to the base assembly 3, and the upper end of the first rear connecting rod 42a is rotatably disposed relative to the seat frame assembly 2. The drive motor assembly includes a motor 43 mounted on the inner side of the seat frame side plate 22 corresponding to the first rear connecting rod 42a, and a gear 44 mounted on the outer side of the seat frame side plate 22 corresponding to the motor 43. The output shaft of the motor 43 passes through the corresponding seat frame side plate 22 and is fixedly connected to the gear 44. The fixed connection between the gear 44 and the output shaft can be achieved by assembly or by integral molding. The upper end of the first rear connecting rod 42a is provided with an arc-shaped tooth 42c. The tooth 42c can be formed directly on the upper end of the first rear connecting rod 42, or it can be formed on a toothed plate and fixed to the upper end of the first rear connecting rod 42 through the toothed plate. In either case, the tooth 42c is kept in mesh with the gear 44. The motor 43 is used to drive the first rear connecting rod 42a through the gear 44 to drive the seat frame assembly 2 to move back and forth relative to the base assembly 3.

[0056] To ensure the smooth forward and backward movement of the seat frame assembly 2, the linkage drive assembly 4 also includes a second rear linkage 42b and two front linkages 41. The second rear linkage 42b is disposed opposite to the first rear linkage 42a at the rear end of the seat frame assembly 2, and the two front linkages 41 are disposed at the front end of the seat frame assembly 2. The second rear linkage 42b is located on the opposite outer side of the other seat frame side plate 22, and its upper end is rotatably disposed relative to the seat frame assembly 2, while its lower end is rotatably connected to the base assembly 3. The axis of rotation of the second rear linkage 42b relative to the seat frame assembly 2 is the same as the axis of rotation of the first rear linkage 42a relative to the seat frame assembly 2. The upper ends of both front connecting rods 41 are rotatably mounted relative to the seat frame assembly 2, and the lower ends of both front connecting rods 41 are rotatably connected to the base assembly 3. The axis of rotation of the front connecting rods 41 relative to the seat frame assembly 2 is parallel to the axis of rotation of the first rear connecting rod 42a relative to the seat frame assembly 2. Through the coordinated arrangement of the first rear connecting rod 42a, the second rear connecting rod 42b, and the two front connecting rods 41, the first rear connecting rod 42a is the driving connecting rod, and the second rear connecting rod 42b and the two front connecting rods 41 are the driven connecting rods. When the motor 43 drives the first rear connecting rod 42a to rotate via gears 44 and 42c, the first rear connecting rod 42a will drive the seat frame assembly 2 and other connecting rods to move in tandem, thereby achieving the purpose of smoothly adjusting the height and angle of the seat frame assembly 2.

[0057] Specifically, as shown in Figures 4 to 8, a rear horizontal tube 24 is rotatably connected between the rear ends of the two seat frame side plates 22. First mounting holes 222 are provided on the two seat frame side plates 22 corresponding to the position of the rear horizontal tube 24. Second mounting holes 42e are provided on the first rear connecting rod 42a and the second rear connecting rod 42b corresponding to the position of the rear horizontal tube 24. Second riveting bushings 243 are nested within each of the two first mounting holes 222. The two ends of the rear horizontal tube 24 pass sequentially through the corresponding second riveting bushings 243 and the second mounting holes 42e. The rear horizontal tube 24 is rotatable relative to the first mounting holes 222. The rear horizontal tube 24 is welded and fixed to the second mounting holes 42e. Through the above connection, the axis of rotation of the first rear connecting rod 42a and the second rear connecting rod 42b relative to the seat frame assembly 2 is the axis of the rear horizontal tube 24. Of course, besides the aforementioned rotating connection method, the rear horizontal tube 24 can also be rotatably connected to the first rear connecting rod 42a and the second rear connecting rod 42b, and fixedly connected to the two seat frame side plates 22, to achieve a relative rotational setting between the first rear connecting rod 42a and the second rear connecting rod 42b and the seat frame assembly 2. Specifically, both ends of the rear horizontal tube 24 are welded and fixed to the two first mounting holes 222, and second riveting bushings 243 are nested within the two second mounting holes 42e, allowing the rear horizontal tube 24 to rotate relative to the second mounting holes 42e. Alternatively, the upper ends of the first rear connecting rod 42a and the second rear connecting rod 42b can be directly rotatably connected to the two seat frame side plates 22 without using the rear horizontal tube 24, such as through riveting / stepped bolt connections. In short, any connection that allows the upper ends of the first rear connecting rod 42a and the second rear connecting rod 42b to rotate relative to the seat frame assembly 2 is acceptable. Preferably, at each end of the rear horizontal tube 24, a booster spring and a fixing center 242 are respectively sleeved at positions located between the rear horizontal tube 24 and the second mounting hole 42e, to limit the first rear connecting rod 42a and the second rear connecting rod 42b. Further, the rear horizontal tube 24 is a hollow tube, with a booster spring and a fixing center 241 connected internally. The booster spring and fixing center 241 are existing structures, and their cooperation with the rear horizontal tube 24 and the seat frame side plate 22 will not be described in detail here.

[0058] As shown in Figures 3 and 5, a front cross tube 23 is rotatably connected between the front ends of the two seat frame side plates 22. Each of the two seat frame side plates 22 has a third mounting hole 223 corresponding to the position of the front cross tube 23. A first riveting bushing 231 is nested within each of the two third mounting holes 223. Both ends of the front cross tube 23 are rotatably connected to the two seat frame side plates 22 via the two first riveting bushings 231. The upper ends of the two front connecting rods 41 are welded and fixed to the front cross tube 23. Through this connection, the axis of rotation of the two front connecting rods 41 relative to the seat frame assembly 2 is the axis of the front cross tube 23. Similarly, the upper ends of the front connecting rods 41 can be rotatably connected to the front cross tube 23, while the two ends of the front cross tube 23 are fixedly connected to the two seat frame side plates 22. Alternatively, the upper ends of the two front connecting rods 41 can be directly rotatably connected to the two seat frame side plates 22 without going through the front cross tube 23, such as by riveting / stepped bolt connection. In short, it is sufficient to achieve a relative rotation setting between the upper ends of the front connecting rods 41 and the seat frame assembly 2.

[0059] As shown in Figures 1, 2, and 9, the base assembly 3 includes two parallel slide rail assemblies 31, two fixed brackets 32 connected to the inner sides of the two slide rail assemblies 31, and two rear fixing plates 33 connected to the outer sides of the two slide rail assemblies 31. The rear fixing plates 33 and the fixed brackets 32 can also be integrated into one piece. The lower ends of the first rear connecting rod 42a, the second rear connecting rod 42b, and the two front connecting rods 41 are rotatably connected to the corresponding fixed brackets 32 by stepped bolts, and the two rear fixing plates 33 are used to support the backrest assembly 1 connected to the seat structure. To enhance the overall structural stability of the base assembly 3, at least a rear reinforcing cross tube 34 is also connected and fixed between the two slide rail assemblies 31.

[0060] Regarding the installation and engagement of the tooth 42c with the motor 43, as shown in Figures 5 and 10-17, in this embodiment, the tooth 42c is formed at the upper end of the first rear connecting rod 42a and is arranged in an arc shape with the second mounting hole 42e as the center. The fan-shaped angle range corresponding to this arc is 150° to 190°. This angle range, combined with the shape and installation of the first rear connecting rod 42a itself, enables a wide range of height and angle adjustments to be made to the seat frame assembly 2. A through hole 224 is provided on the seat frame side plate 22 for the output shaft of the motor 43 to pass through. The through hole 224 is located adjacent to the first mounting hole 222 to ensure the meshing of the tooth 42c with the gear 44. Through the engagement of the gear and the tooth, the tooth 42c can rotate coaxially with the rear cross tube 24, thereby making the adjustment process of the seat cushion smoother. The motor 43 is fixedly mounted on the corresponding seat frame side plate 22 via a motor bracket 25. Specifically, the motor bracket 25 is located on the outer side of the seat frame side plate 22 and covers the position of the gear 44. Two bolts are connected at intervals along the edge of the motor bracket 25. The seat frame side plate 22 has through holes for the two bolts to pass through. Each bolt passes through the corresponding through hole and is fixedly connected to the motor 43. Preferably, a limiting groove 42d is formed on the first rear connecting rod 42a along the extension direction parallel to the gear 42c. One of the two bolts acts as a limiting post 251 and cooperates with the limiting groove 42d to limit the rotation range of the first rear connecting rod 42a relative to the seat frame assembly 2.

[0061] Therefore, this bolt, one of the two bolts, not only serves to fix the motor bracket 25 and the motor 43 to the seat frame side plate 22, but also functions as a limiting post 251, cooperating with the limiting groove 42d to limit the rotation range of the first rear connecting rod 42a. To this end, in some embodiments, for example referring to Figure 5, a smooth sleeve 252 can be fitted onto this bolt, the smooth sleeve 252 being radially positioned between the bolt and the limiting groove 42d to facilitate the sliding guidance of the bolt within the limiting groove 42d. The smooth sleeve 252 can be fixed, for example, welded to the outside of the seat frame side plate 22, and coaxial with the through hole in the seat frame side plate 22 through which the bolt passes; alternatively, the section of the bolt that contacts the limiting groove 42d can be designed as a smooth, threadless section to facilitate the sliding guidance of the bolt within the limiting groove 42d, thus eliminating the need for the smooth sleeve 252.

[0062] As shown in Figures 11-17, when the first rear connecting rod 42a rotates relative to the seat frame assembly 2, the limiting post 251 moves along the limiting groove 42d, and the seat frame assembly 2 moves back and forth relative to the base assembly 3. When the first rear connecting rod 42a rotates counterclockwise relative to the seat frame assembly 2, the seat frame assembly 2 moves backward relative to the base assembly 3, and at the same time, the limiting post 251 moves towards the front end of the limiting groove 42d. When the limiting post 251 moves to the front end position of the limiting groove 42d, the seat frame assembly 2 moves backward relative to the base assembly 3 to its lowest rear end height, as shown in Figure 13. With the initial position of the seat structure as shown in Figure 13, when the first rear connecting rod 42a rotates clockwise relative to the seat frame assembly 2, the seat frame assembly 2 will move forward relative to the base assembly 3. Simultaneously, the limiting post 251 moves towards the rear end of the limiting groove 42d. As it moves, the rear end of the seat frame assembly 2 gradually rises. When at least one of the first rear connecting rod 42a and the front connecting rod 41 rotates to a vertical position, the seat frame assembly 2 is raised to its highest position, as shown in Figure 12. As it continues to move, the front connecting rod 41 and the first rear connecting rod 42a will simultaneously tilt forward, causing the seat frame assembly 2 to move forward relative to the base assembly 3 and gradually decrease in height until the limiting post 251 moves to the rear end position of the limiting groove 42d, at which point the overall height of the seat frame assembly 2 is reduced to its lowest point, as shown in Figures 16 and 17.

[0063] It should be noted that, since the seat frame assembly 2 in the seat cushion structure is usually covered with seat cushion foam, in order to prevent the teeth 42c from cutting the seat cushion foam when the seat frame assembly 2 moves forward relative to the base assembly 3, in this embodiment, the upper end of the seat frame side plate 22 on the side corresponding to the teeth 42c is bent outward to form a side plate flange 221 for blocking the teeth 42c. With this setting, the seat cushion structure does not need to increase the thickness of the rear end of the seat cushion foam to prevent the seat cushion foam from being cut by the teeth 42c. In addition, a leg rest can also be provided on this seat cushion structure. As shown in Figures 5 and 20, a front lower cross tube 26 is also provided on the front side of the front cross tube 23. The two ends of the front lower cross tube 26 are respectively fixedly connected to the two seat frame side plates 22, and at least two leg rest brackets 27 for mounting the leg rest are provided at intervals on the front lower cross tube 26.

[0064] This embodiment uses a toothed connecting rod and gears in conjunction with a motor to drive the adjustment of the seat cushion, enabling the seat cushion structure to achieve a wider range of height and angle adjustments, and to sink forward a large distance. Therefore, based on the adjustable seat cushion structure of this embodiment, and in conjunction with the forward folding of the seat back assembly 1, the seat folding function can be realized. Specifically, as shown in Figures 18 to 20, a seat includes a backrest assembly 1 and the adjustable seat cushion structure of this embodiment. The backrest assembly 1 has upper backrest connecting plates 12 on both sides along the width direction. In order to conform to the lumbar curve of the driver and passenger, the upper backrest connecting plates 12 are usually designed to be a forward-protruding arc shape. The lower ends of the two upper backrest connecting plates 12 are respectively rotatably connected to the base assembly 3 through an angle adjuster. Specifically, the two rear fixing plates 33 of the base assembly 3 are fixedly connected to the lower backrest connecting plates 11 by bolts, and the two lower backrest connecting plates 11 are connected to the angle adjuster. As described above, the adjustable seat cushion structure allows the seat frame assembly 2 to move forward to its lowest position relative to the base assembly 3, forming a clearance space 5 in the horizontal direction to avoid the arc-shaped area of ​​the connecting plate 12 on the backrest when flipping forward, as shown by the double arrows in Figure 20. Therefore, when the backrest assembly 1 is installed with the base assembly 3, it only needs to meet the requirement that after the seat frame assembly 2 moves forward to its lowest position relative to the base assembly 3, the backrest assembly 1 flips forward relative to the base assembly 3 to achieve a flat backrest assembly 1 when folded forward, improving the folding effect. In addition, by arranging the teeth 42c on the outside of the seat frame side plate 22 and the motor 43 on the inside of the seat frame side plate 22, the overall structure of the seat cushion is compact and occupies little space. At the same time, it can avoid the space of the rear fixing plate 33 in the Y direction, allowing the rear fixing plate 33 to extend forward to increase the support strength of the backrest assembly 1.

[0065] Referring to Figures 21-24, a second embodiment of the adjustable seat cushion structure is shown. Compared to the first embodiment, this embodiment differs in that the fan-shaped angle range corresponding to the tooth 42c is 210°–250°. This angle range allows for a wider range of angle adjustment than the first embodiment. Specifically, as shown in Figures 23 and 24, when the seat frame assembly 2 moves rearward relative to the base assembly 3 to its lowest position, the height of the rear end of the seat frame assembly 2 is lower than in the first embodiment. Therefore, the tilt angle range of the seat frame assembly 2 relative to its initial position is larger, reaching 8°–10°. This angle range is sufficient to achieve a zero-pressure mode for the seat by coordinating with the rearward swing of the backrest assembly 1. Other structures not mentioned in this embodiment are the same as in the first embodiment.

[0066] Referring to Figure 25, a third embodiment of the adjustable seat cushion structure is shown. This embodiment mainly sets the gear and gear-motor drive mechanism of the first or second embodiment into two sets arranged left and right. That is, another gear 42c is provided on the upper end of the second rear link 42b, and another drive motor assembly corresponding to the second rear link 42b is installed on the other seat frame side plate 22. The motor 43 of the other drive motor assembly drives the second rear link 42b and the first rear link 42a together through the corresponding gear 44 to drive the seat frame assembly 2 to move back and forth relative to the base assembly 3. Other structures not mentioned in this embodiment are the same as in the first or second embodiment. This embodiment can achieve double-sided gear locking by setting two sets of drive mechanisms, which has higher locking strength and can be applied to high-strength requirements.

[0067] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. An adjustable seat cushion structure, characterized in that, The device includes a seat frame assembly, a base assembly, and a linkage drive assembly. The seat frame assembly includes two seat frame side plates arranged opposite each other. The linkage drive assembly includes a first rear linkage and a drive motor assembly. The first rear linkage is located on the opposite outer side of one of the seat frame side plates, and its lower end is rotatably connected to the base assembly. Its upper end is rotatably arranged relative to the seat frame assembly. The drive motor assembly includes a motor mounted on the opposite inner side of the seat frame side plate corresponding to the first rear linkage and a gear mounted on the opposite outer side of the seat frame side plate corresponding to the motor. The output shaft of the motor passes through the corresponding seat frame side plate and is fixedly connected to the gear. The first rear linkage has arc-shaped teeth that mesh with the gear. The motor drives the first rear linkage via the gear to drive the seat frame assembly to move back and forth relative to the base assembly.

2. The adjustable seat cushion structure as described in claim 1, characterized in that: The linkage drive assembly further includes a second rear linkage, which is located on the opposite outer side of another seat frame side plate. The upper end of the second rear linkage is rotatably disposed relative to the seat frame assembly, and the lower end is rotatably connected to the base assembly. The axis of rotation of the second rear linkage relative to the seat frame assembly is the same as the axis of rotation of the first rear linkage relative to the seat frame assembly.

3. The adjustable seat cushion structure as described in claim 2, characterized in that: The second rear link is provided with another tooth, and the other seat frame side plate is equipped with another drive motor assembly corresponding to the second rear link. The motor of the other drive motor assembly drives the second rear link and the first rear link together to drive the seat frame assembly to move back and forth relative to the base assembly through the corresponding gear.

4. The adjustable seat cushion structure as described in any one of claims 1 to 3, characterized in that: The upper end of the seat frame side plate on which the drive motor assembly is installed is provided with a side plate flange for covering the corresponding tooth.

5. The adjustable seat cushion structure as described in any one of claims 1 to 4, characterized in that: The sector angle corresponding to the tooth is in the range of 150° to 250°.

6. The adjustable seat cushion structure as described in any one of claims 2 to 5, characterized in that: A rear cross tube is rotatably connected between the two seat frame side plates. Both ends of the rear cross tube pass through the two seat frame side plates and are fixedly connected to the upper ends of the first rear connecting rod and the second rear connecting rod, respectively. A rear horizontal tube is fixedly connected between the two seat frame side plates. Both ends of the rear horizontal tube pass through the two seat frame side plates and are rotatably connected to the upper ends of the first rear connecting rod and the second rear connecting rod, respectively. The upper ends of the first and second rear connecting rods are respectively rotatably connected to the two seat frame side plates by riveting / step bolts.

7. The adjustable seat cushion structure as described in any one of claims 2 to 5, characterized in that: The base assembly includes two parallel slide rail assemblies, two fixed brackets connected to the inner sides of the two slide rail assemblies, and two rear fixed plates connected to the outer sides of the two slide rail assemblies. The lower ends of the first rear connecting rod and the second rear connecting rod are rotatably connected to the two fixed brackets, and the two rear fixed plates are used to support the backrest assembly.

8. The adjustable seat cushion structure as described in claim 7, characterized in that: The linkage drive assembly further includes two front linkages, the upper ends of which are rotatably disposed relative to the seat frame assembly, and the lower ends of which are rotatably connected to the two fixed brackets respectively. The axis of rotation of the front linkages relative to the seat frame assembly is parallel to the axis of rotation of the first rear linkage relative to the seat frame assembly.

9. The adjustable seat cushion structure as described in claim 8, characterized in that: A front cross tube is rotatably connected between the two seat frame side plates, and the upper ends of the two front connecting rods are fixedly connected to the front cross tube.

10. The adjustable seat cushion structure as described in any one of claims 1 to 7, characterized in that: The linkage drive assembly also includes two front linkages, the upper ends of which are rotatably disposed relative to the seat frame assembly, and the lower ends of which are rotatably connected to the base assembly.

11. The adjustable seat cushion structure as described in claim 10, characterized in that: A front cross tube is rotatably connected between the two seat frame side plates, and the upper ends of both front connecting rods are fixedly connected to the front cross tube, or... A front cross tube is fixedly connected between the two seat frame side plates, and the upper ends of both front connecting rods are rotatably connected to the front cross tube, or... The upper ends of the two front connecting rods are rotatably connected to the two seat frame side plates by riveting / step bolts.

12. The adjustable seat cushion structure as described in any one of claims 1 to 11, characterized in that: The seat frame side plate has through holes for bolts to pass through. Each bolt passes through the corresponding through hole and is fixedly connected to the motor. A limiting groove is provided on the first rear connecting rod. One of the bolts acts as a limiting post and cooperates with the limiting groove to limit the rotation range of the first rear connecting rod relative to the seat frame assembly.

13. A seat, characterized in that, The backrest assembly includes an adjustable seat cushion structure as described in any one of claims 1 to 12, wherein the backrest assembly is rotatably connected to the base assembly and is configured such that, when the seat frame assembly moves forward relative to the base assembly, the backrest assembly rotates forward relative to the base assembly to form a folded state with respect to the seat frame assembly.

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