Adjustable cushion structure and seat

Abstract

The utility model relates to an adjustable cushion structure and a seat, the cushion structure comprises a seat frame assembly, a base assembly and a connecting rod driving assembly, the seat frame assembly comprises two seat frame side plates which are oppositely arranged, and the connecting rod driving assembly comprises a first rear connecting rod and a driving motor assembly; wherein the first rear connecting rod is located on the outer side of one seat frame side plate, the lower end of the first rear connecting rod is rotationally connected with the base assembly, and the upper end of the first rear connecting rod is rotationally arranged relative to the seat frame assembly; the driving motor assembly comprises a motor and a gear which are mounted on the inner side and the outer side of the seat frame side plate respectively, an output shaft of the motor penetrates out of the corresponding seat frame side plate and is fixedly connected to the gear, teeth extending in an arc shape are arranged on the first rear connecting rod, and the teeth are meshed with the gear; the motor drives the first rear connecting rod through the gear to drive the seat frame assembly to move back and forth relative to the base assembly. The seat cushion can be adjusted in a larger range, and is compact in structure and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile seats, in particular to an adjustable cushion structure and a seat. Background Art

[0002] As an important component of a car, car seats, in addition to their seating function, are usually equipped with the function of flipping the backrest forward and folding it down to meet the needs of obtaining more trunk space.

[0003] In order to adapt to the lumbar curve of the driver and passenger, the backrest of the existing car seat is usually designed with a connecting plate on the backrest that is curved forward and serves as a side wing of the backrest to improve the support for the driver and passenger's waist. Therefore, when the backrest is flipped forward and folded down, the foam corresponding to the curved area of ​​the connecting plate on the backrest will offset the foam of the seat cushion, limiting the forward rotation angle of the backrest. Although the seat cushion of the existing car seat can achieve a certain degree of height adjustment and angle adjustment through the connecting rod and the drive mechanism, these adjustments are almost only limited to the riding comfort requirements, and the adjustment range is small. Even if the seat cushion is adjusted to the lowest position, it is still impossible to completely avoid the curved area of ​​the connecting plate on the backrest, resulting in the backrest being unable to be completely flat, reducing the effect of flipping and folding the car seat back forward.

[0004] In order to solve the above problems, some car seats have been developed by replacing the driving mechanism with a recliner, which drives the rear or front connecting rod of the connecting rod mechanism with the angle of the recliner, so that the swing range of the connecting rod mechanism is larger, and the seat cushion can completely avoid the raised part of the backrest, thereby achieving the purpose of flattening the backrest. For example, the disclosed patent CN117621957A adopts the angle drive of the rear connecting rod recliner. Another example is the disclosed patent CN117183847A adopts the angle drive of the front connecting rod recliner. Although the above-mentioned structural form of using a recliner to drive the connecting rod mechanism can increase the swing range of the connecting rod mechanism and solve the problem that the backrest cannot be laid flat, the recliner is expensive and takes up a lot of space, especially the concentric recliner. When the eccentric recliner is driven, the smoothness of the rotation is poor. Therefore, there is a need for a seat cushion structure that is more economical, takes up less space, and can achieve a wide range of adjustment. Utility Model Content

[0005] In order to solve the above problems, the utility model provides an adjustable seat cushion structure and a seat, which can enable the seat cushion to be adjusted in a wider range, thereby meeting the requirement that the backrest can be laid flat when folded forward, and is more economical, compact and space-saving than a recliner drive.

[0006] The utility model is implemented through the following scheme: an adjustable seat cushion structure includes a seat frame assembly, a base assembly and a connecting rod drive assembly, the seat frame assembly includes two seat frame side panels arranged opposite to each other, the connecting rod drive assembly includes a first rear link and a drive motor assembly; wherein, the first rear link is located at the relatively outer side of one of the seat frame side panels, and the lower end of the first rear link is rotatably connected to the base assembly, and the upper end of the first rear link is rotatably arranged relative to the seat frame assembly; the drive motor assembly includes a motor installed on the relatively inner side of the seat frame side panel corresponding to the first rear link and a gear installed on the relatively outer side of the seat frame side panel corresponding to the motor, the output shaft of the motor passes through the corresponding seat frame side panel and is fixedly connected to the gear, the first rear link is provided with teeth extending in an arc shape, and the teeth are meshed with the gear; the motor is used to drive the first rear link through the gear to drive the seat frame assembly to move forward and backward relative to the base assembly.

[0007] A further improvement of the present invention is that: the connecting rod drive assembly also includes a second rear connecting rod, the second rear connecting rod is located on the relatively outer side of the other seat frame side panel, and the upper end of the second rear connecting rod is arranged to rotate relative to the seat frame assembly, and the lower end is rotatably connected to the base assembly, and the axis of rotation of the second rear connecting rod relative to the seat frame assembly is the same as the axis of rotation of the first rear connecting rod relative to the seat frame assembly.

[0008] A further improvement of the present invention is that: another tooth is provided on the second rear connecting rod, and another seat frame side plate is installed with another drive motor assembly corresponding to the second rear connecting rod, and the motor of the other drive motor assembly drives the second rear connecting rod and the first rear connecting rod through the corresponding gear to jointly drive the seat frame assembly to move forward and backward relative to the base assembly.

[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 shielding the corresponding teeth.

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

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

[0012] A further improvement of the present utility model is that the base assembly includes two parallel sliding rail assemblies, two fixed brackets connected to the relatively inner sides of the two sliding rail assemblies, and two rear fixed plates connected to the relatively outer sides of the two sliding 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 and connect the backrest assembly.

[0013] A further improvement of the present invention is that the connecting rod drive assembly also includes two front connecting rods, the upper ends of the two front connecting rods are arranged to rotate relative to the seat frame assembly, the lower ends of the two front connecting rods are respectively connected to the two fixed brackets for rotation, and the axis of rotation of the front connecting rods relative to the seat frame assembly is parallel to the axis of rotation of the first rear connecting rod relative to the seat frame assembly.

[0014] 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.

[0015] The present utility model also provides a seat, comprising a backrest assembly and the adjustable cushion structure as described above, 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 the seat frame assembly.

[0016] The utility model includes but is not limited to the following beneficial effects:

[0017] 1. The seat adopts a seat-back separation structure, which enables the backrest to fold forward. The seat cushion is adjusted by using a connecting rod with teeth and a gear driven by a motor, so that the seat cushion structure can be adjusted in a wider range, 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. It is also more economical than a recliner drive.

[0018] 2. The seat adopts a seat-back separation structure, which requires the rear fixed plate connected to the backrest assembly to have a higher longitudinal height and higher strength requirements. Therefore, the space outside the seat frame side panel is compressed. By arranging the teeth on the outside of the seat frame side panel and the motor on the inside of the seat frame side panel, the overall structure of the seat cushion is compact and occupies less space. It can also prevent the teeth from 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, the space of the rear fixed plate can be avoided in the Y direction, so that the rear fixed plate can extend forward to increase the supporting strength of the backrest assembly.

[0019] 3. The coordinated drive of the gears and teeth enables the teeth to rotate coaxially with the rear cross tube, making the seat adjustment process smoother. Moreover, the larger range of sector angle settings of the teeth allows the seat to be adjusted to more different positions to meet the different needs of the passengers.

[0020] 4. By arranging the drive devices on both sides, the locking strength of the seat adjustment is increased, and it can be used in scenarios with higher strength requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional schematic diagram of the first embodiment of the seat cushion structure of the present invention is shown.

[0022] Figure 2 The figure shows an assembly diagram of the connecting rod driving assembly and the base assembly in the first embodiment of the seat cushion structure of the present invention.

[0023] Figure 3 The figure shows an assembly diagram of the seat frame assembly and the front connecting rod in the first embodiment of the seat cushion structure of the present invention.

[0024] Figure 4 A schematic diagram showing 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 is shown.

[0025] Figure 5 Shown Figure 4 Exploded schematic diagram of the structure shown.

[0026] Figure 6 Shown Figure 4 AA cross-section of the structure shown.

[0027] Figure 7 Shown Figure 6 Magnified view of point B of the structure shown.

[0028] Figure 8 Shown Figure 6 Magnified view of point C of the structure shown.

[0029] Figure 9 The figure shows an assembly diagram of the base assembly in the first embodiment of the seat cushion structure of the present invention.

[0030] Figure 10 A schematic diagram showing the tooth distribution range of the teeth in the first embodiment of the seat cushion structure of the present invention is shown.

[0031] Figure 11 A schematic diagram showing the matching state of the teeth and gears during the adjustment process of the first embodiment of the seat cushion structure of the present invention is shown.

[0032] Figure 12The figure shows the matching state of the teeth and the gear when the first embodiment of the seat cushion structure of the present invention is adjusted to the highest position.

[0033] Figure 13 The figure shows the matching state of the teeth and the gear when the first embodiment of the seat cushion structure of the present invention is adjusted backward to the lowest position.

[0034] Figure 14 The figure shows a three-dimensional structural diagram of the first embodiment of the seat cushion structure of the present invention when it is adjusted backward to the lowest position.

[0035] Figure 15 Shown Figure 14 Magnified view of point D of the structure shown.

[0036] Figure 16 The diagram shows the three-dimensional structure of the first embodiment of the seat cushion structure of the present invention when it is adjusted forward to the lowest position.

[0037] Figure 17 The figure shows the matching state of the teeth and the gear when the first embodiment of the seat cushion structure of the present invention is adjusted forward to the lowest position.

[0038] Figure 18 The figure shows a three-dimensional structural diagram of the backrest assembly in the embodiment of the seat of the present invention.

[0039] Figure 19 The diagram shows a three-dimensional structure of a seat assembly in an unfolded state using the seat cushion structure of the first embodiment of the present invention.

[0040] Figure 20 The diagram shows a three-dimensional structure of a seat assembly in a folded state using the seat cushion structure of the first embodiment of the present invention.

[0041] Figure 21 A schematic diagram showing the tooth distribution range of the teeth in the second embodiment of the seat cushion structure of the present invention is shown.

[0042] Figure 22 The figure shows a three-dimensional structural diagram of the second embodiment of the seat cushion structure of the present invention when it is adjusted backward to the lowest position.

[0043] Figure 23 A schematic diagram showing the matching state of the teeth and gears during the adjustment process of the second embodiment of the seat cushion structure of the present invention is shown.

[0044] Figure 24 The figure shows the matching state of the teeth and the gear when the second embodiment of the seat cushion structure of the present invention is adjusted backward to the lowest position.

[0045] Figure 25The figure shows a three-dimensional structural diagram of a third embodiment of the seat cushion structure of the present invention in a partially exploded state.

[0046] In the figure: 1. Backrest assembly; 11. Backrest lower connecting plate; 12. Backrest upper connecting plate; 2. Seat frame assembly; 21. Seat basin; 22. Seat frame side panel; 221. Side panel flange; 222. First mounting hole; 223. Third mounting hole; 23. Front cross tube; 231. First riveted bushing; 24. Rear cross tube; 241. Assist spring and fixed centering; 242. Limiting ring; 243. Second riveted bushing; 25. Motor support Frame; 251, limit column; 26, front lower cross tube; 27, leg support bracket; 3, base assembly; 31, slide rail assembly; 32, fixed bracket; 33, rear fixed plate; 34, rear reinforced cross tube; 4, connecting rod drive assembly; 41, front connecting rod; 42a, first rear connecting rod; 42b, second rear connecting rod; 42c, tooth; 42d, limit slot; 42e, second mounting hole; 43, motor; 44, gear; 5, avoidance space. DETAILED DESCRIPTION

[0047] In order to solve the problems of the existing seat cushion structure having a small adjustment range, being unable to meet the requirements of folding the backrest forward and flat, and the high cost and large space occupied by using a recliner to drive the seat cushion adjustment, the utility model provides an adjustable seat cushion structure and a seat. The adjustable seat cushion structure and the seat are further explained below with specific embodiments and accompanying drawings.

[0048] See Figures 1 to 20As shown in the figure, a first embodiment of an adjustable seat cushion structure and a seat embodiment with the adjustable seat cushion structure are shown. The adjustable seat cushion structure in this embodiment includes a seat frame assembly 2, a base assembly 3 and a connecting rod drive assembly 4. The seat frame assembly 2 includes two seat frame side panels 22 arranged opposite to each other, and a seat basin 21 for the passenger to sit on is usually fixedly connected between the two seat frame side panels 22. The connecting rod drive assembly 4 includes a first rear connecting rod 42a and a drive motor assembly; wherein the first rear connecting rod 42a is located on the relatively outer side of one seat frame side panel 22, and the 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 arranged relative to the seat frame assembly 2; the driving motor assembly includes a motor 43 installed on the relatively inner side of the seat frame side panel 22 corresponding to the first rear connecting rod 42a and a gear 44 installed on the relatively outer side of the seat frame side panel 22 corresponding to the motor 43, the output shaft of the motor 43 passes through the corresponding seat frame side panel 22 and is fixedly connected to the gear 44, and the fixed connection between the gear 44 and the output shaft includes being achieved by assembly or by one-piece molding. The upper end of the first rear link 42a is provided with an arc-shaped extending tooth 42c. The tooth 42c can be directly formed on the upper end of the first rear link 42, or formed on a tooth plate and fixed to the upper end of the first rear link 42 through the tooth plate. Regardless of the form, the tooth 42c remains engaged with the gear 44; the motor 43 is used to drive the first rear link 42a through the gear 44 to drive the seat frame assembly 2 to move forward and backward relative to the base assembly 3.

[0049] To ensure smooth forward and backward movement of the seat frame assembly 2, the connecting rod drive assembly 4 further includes a second rear connecting rod 42b and two front connecting rods 41. The second rear connecting rod 42b is disposed at the rear end of the seat frame assembly 2, opposite the first rear connecting rod 42a, while the two front connecting rods 41 are disposed at the front end of the seat frame assembly 2. The second rear connecting rod 42b is located on the opposite outer side of the other seat frame side panel 22, with the upper end of the second rear connecting rod 42b rotatably disposed relative to the seat frame assembly 2 and the lower end rotatably connected to the base assembly 3. The axis of rotation of the second rear connecting rod 42b relative to the seat frame assembly 2 is the same as the axis of rotation of the first rear connecting rod 42a relative to the seat frame assembly 2. The upper ends of the two front links 41 are rotatably mounted relative to the seat frame assembly 2, and the lower ends of the two front links 41 are rotatably connected to the base assembly 3. The axis of rotation of the front links 41 relative to the seat frame assembly 2 is parallel to the axis of rotation of the first rear link 42a relative to the seat frame assembly 2. The coordinated arrangement of the first rear link 42a, the second rear link 42b, and the two front links 41 establishes the first rear link 42a as the active link, while the second rear link 42b and the two front links 41 as the passive links. When the motor 43 drives the first rear link 42a to rotate via the gear 44 and the teeth 42c, the first rear link 42a drives the seat frame assembly 2 and the other links to rotate in a coordinated manner, thereby achieving the purpose of smoothly adjusting the height and angle of the seat frame assembly 2.

[0050] Specifically, if Figures 4 to 8As shown, a rear cross tube 24 is rotatably connected between the rear ends of the two seat frame side panels 22, and a first mounting hole 222 is opened on the two seat frame side panels 22 at a position corresponding to the rear cross tube 24, and a second mounting hole 42e is opened on the first rear connecting rod 42a and the second rear connecting rod 42b at a position corresponding to the rear cross tube 24, and a second riveted bushing 243 is nested in the two first mounting holes 222, and the two ends of the rear cross tube 24 pass through the corresponding second riveted bushing 243 and the second mounting hole 42e in sequence, and the rear cross tube 24 is rotatable relative to the first mounting hole 222, and the rear cross tube 24 is welded and fixed to the second mounting hole 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 cross tube 24. Of course, in addition to the aforementioned rotational connection, the rear cross tube 24 can also be rotationally connected to the first and second rear links 42a, 42b, and fixedly connected to the two seat frame side panels 22 to achieve relative rotation between the first and second rear links 42a, 42b, and the seat frame assembly 2. Specifically, the ends of the rear cross tube 24 are welded to the two first mounting holes 222, and second riveted bushings 243 are nested within the two second mounting holes 42e. The second riveted bushings 243 allow the rear cross tube 24 to rotate relative to the second mounting holes 42e. Alternatively, the upper ends of the first and second rear links 42a, 42b can be directly rotationally connected to the two seat frame side panels 22, respectively, without the use of the rear cross tube 24, such as by riveting or step bolts. In short, any method that achieves relative rotation between the upper ends of the first and second rear links 42a, 42b and the seat frame assembly 2 will suffice. Preferably, a booster spring and a fixed centering element 242 are sleeved onto the two ends of the rear cross tube 24, located between the rear cross tube 24 and the second mounting hole 42e, to position the first rear link 42a and the second rear link 42b. Furthermore, the rear cross tube 24 is a hollow tube, internally connected to the booster spring and fixed centering element 241. The booster spring and fixed centering element 241 are conventional structures, and their coordination with the rear cross tube 24 and the seat frame side panel 22 is not further described here.

[0051] like Figure 3 and Figure 5As shown, a front cross tube 23 is rotatably connected between the front ends of the two seat frame side panels 22. Third mounting holes 223 are defined on the two seat frame side panels 22 at locations corresponding to the front cross tube 23. Each of the third mounting holes 223 houses a first riveted bushing 231. The ends of the front cross tube 23 are rotatably connected to the two seat frame side panels 22 via the two first riveted bushings 231. The upper ends of the two front connecting rods 41 are welded to the front cross tube 23. This connection ensures that 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 ends of the front cross tube 23 are fixedly connected to the two seat frame side panels 22. Alternatively, the upper ends of the two front connecting rods 41 can be directly rotatably connected to the two seat frame side panels 22 without the use of the front cross tube 23, such as by riveting or stepped bolts. In short, it is sufficient to realize the relative rotation of the upper end of the front connecting rod 41 and the seat frame assembly 2.

[0052] like Figure 1 、 Figure 2 and Figure 9 As shown, the base assembly 3 comprises two parallel rail assemblies 31, two fixing brackets 32 connected to the opposite inner sides of the two rail assemblies 31, and two rear fixing plates 33 connected to the opposite outer sides of the two rail assemblies 31. The rear fixing plates 33 and the fixing brackets 32 can also be integrated into a single 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 fixing brackets 32 via stepped bolts. The two rear fixing plates 33 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 fixedly connected between the two rail assemblies 31.

[0053] Regarding the installation and matching of the tooth 42c and the motor 43, Figure 5 、 Figures 10 to 17As shown, the teeth 42c of this embodiment are formed at the upper end of the first rear link 42a and arranged in an arc centered around the second mounting hole 42e. This arc corresponds to a sector angle range of 150° to 190°. This angle range, combined with the shape and mounting of the first rear link 42a, enables a wide range of height and angle adjustment for the seat frame assembly 2. A stop post 251 is provided on the seat frame side panel 22 for the output shaft of the motor 43 to pass through. This stop post 251 is positioned adjacent to the first mounting hole 222 to ensure meshing of the teeth 42c with the gear 44. The coordinated drive of the gear and teeth allows the teeth 42c to rotate coaxially with the rear cross tube 24, thereby smoothing the seat adjustment process. The motor 43 is fixedly mounted on the corresponding seat frame side panel 22 via a motor bracket 25. Specifically, the motor bracket 25 is located on the relatively outer side of the seat frame side panel 22 and covers the position of the gear 44. Two bolts are spaced apart at the edge of the motor bracket 25. The seat frame side panel 22 is provided with through holes for two bolts to pass through, and each bolt is fixedly connected to the motor 43 after passing through the corresponding through hole. Preferably, a limiting groove 42d is provided on the first rear connecting rod 42a in a direction parallel to the extension direction of the tooth 42c. One of the two bolts serves as a limiting column 251 and is used in conjunction with the limiting groove 42d to limit the rotation range of the first rear connecting rod 42a relative to the seat frame assembly 2. Specifically, Figures 11 to 17 As shown, when the first rear connecting rod 42a rotates relative to the seat frame assembly 2, the limiting post 251 moves along the limiting slot 42d, and the seat frame assembly 2 achieves forward and backward movement 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 rearward relative to the base assembly 3, and the limiting post 251 moves toward the front end of the limiting slot 42d. When the limiting post 251 moves to the front end of the limiting slot 42d, the seat frame assembly 2 moves rearward relative to the base assembly 3 to the lowest rear end height, as shown in FIG. Figure 13 As shown. Figure 13 When the seat cushion structure is in the initial position, when the first rear link 42a rotates clockwise relative to the seat frame assembly 2, the seat frame assembly 2 will move forward relative to the base assembly 3, and at the same time, the limiting column 251 moves toward 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 link 42a and the front link 41 rotates to a vertical state, the seat frame assembly 2 is lifted to the highest position, as shown in FIG. Figure 11 and Figure 12 As the movement continues, the front link 41 and the first rear link 42a will tilt forward at the same time, and the seat frame assembly 2 will move forward relative to the base assembly 3, and the height will gradually decrease until the limiting column 251 moves to the rear end position of the limiting groove 42d, and the overall height of the seat frame assembly 2 is reduced to the lowest, as shown in FIG. Figure 16and Figure 17 shown.

[0054] It should be noted that, since the outside of the seat frame assembly 2 in the seat cushion structure is usually wrapped 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 panel 22 corresponding to the side of the tooth 42c is bent relatively outward to form a side panel flange 221 for shielding the tooth 42c. Through this arrangement, 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 the seat cushion structure, such as Figure 5 and Figure 20 As shown, a front lower cross tube 26 is further 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 panels 22, and at least two leg rest brackets 27 for leg rest installation are provided on the front lower cross tube 26 at intervals.

[0055] This embodiment uses a connecting rod with teeth and a gear to achieve seat cushion adjustment through a motor drive, so that the seat cushion structure can achieve a wider range of height and angle adjustment, and can 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 folding function of the seat can be achieved. Figures 18 to 20 As shown, 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 match the waist curve of the driver and passenger, the upper backrest connecting plates 12 are usually designed to be an arc convex forward. The lower ends of the two upper backrest connecting plates 12 are respectively rotatably connected to the base assembly 3 through angle adjusters. 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 adjusters. As can be seen from the above, the adjustable seat cushion structure can realize the seat frame assembly 2 moving forward to the lowest position relative to the base assembly 3, and can form an avoidance space 5 in the horizontal direction for avoiding the arc area of ​​the upper backrest connecting plate 12 when flipping forward. As shown Figure 20 The double-arrowed area corresponds to the area. Therefore, when the backrest assembly 1 is installed in conjunction with the base assembly 3, the backrest assembly 1 only needs to flip forward relative to the base assembly 3 after the seat frame assembly 2 moves forward to its lowest position relative to the base assembly 3. This allows the backrest assembly 1 to lie flat when folded forward, improving the folding effect. Furthermore, by arranging the teeth 42c on the outside of the seat frame side panel 22 and the motor 43 on the inside of the seat frame side panel 22, the overall seat cushion structure is compact and occupies minimal space. Furthermore, space is cleared in the Y direction for the rear fixing plate 33, allowing the rear fixing plate 33 to extend forward, thereby increasing the support strength of the backrest assembly 1.

[0056] See Figures 21 to 24 As shown in the figure, a second embodiment of the adjustable seat cushion structure is shown. Compared with the first embodiment, the difference between this embodiment and the first embodiment is that the sector angle range corresponding to the tooth 42c in this embodiment is 210° to 250°, which can achieve a wider range of angle adjustment than the first embodiment. Figure 23 and Figure 24 As shown, when the seat frame assembly 2 moves rearwardly relative to the base assembly 3 to its lowest position, the rear end of the seat frame assembly 2 is lower than that of the first embodiment. Consequently, the seat frame assembly 2 has a wider tilt angle range, reaching 8° to 10°. This angle range is sufficient to achieve a zero-pressure mode of the seat in conjunction with the rearward swing of the backrest assembly 1. All other structures not mentioned in this embodiment are the same as those of the first embodiment.

[0057] See Figure 25 The figure shows a third embodiment of an adjustable seat cushion structure. This embodiment primarily utilizes the gear and tooth-coordinated motor drive mechanism of the first or second embodiment, arranged in two sets, one on each side. Specifically, another set of gears 42c is provided at the upper end of the second rear link 42b. Another drive motor assembly corresponding to the second rear link 42b is mounted on the other seat frame side panel 22. The motor 43 of this other drive motor assembly, via the corresponding gear 44, drives the second rear link 42b and the first rear link 42a, thereby driving the seat frame assembly 2 forward and backward relative to the base assembly 3. Other structures not mentioned in this embodiment are identical to those of the first or second embodiment. This dual drive mechanism achieves bilateral gear locking, resulting in higher locking strength and suitable for applications requiring high strength.

[0058] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. A person 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. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. An adjustable seat cushion structure, characterized in that: The camshaft is connected to the chassis to move the first and second chassis components together, and the camshaft is connected to the chassis to move the first and second chassis components together.

2. The adjustable seat cushion structure according to claim 1, characterized in that: The connecting rod drive assembly also includes a second rear connecting rod, which is located on the relatively outer side of the other seat frame side panel, and the upper end of the second rear connecting rod is arranged to rotate relative to the seat frame assembly, and the lower end is rotatably connected to the base assembly, and the axis of rotation of the second rear connecting rod relative to the seat frame assembly is the same as the axis of rotation of the first rear connecting rod relative to the seat frame assembly.

3. The adjustable seat cushion structure according to claim 2, characterized in that: Another tooth is provided on the second rear connecting rod, and another seat frame side plate is installed with another drive motor assembly corresponding to the second rear connecting rod. The motor of the other drive motor assembly drives the second rear connecting rod and the first rear connecting rod through the corresponding gear to jointly drive the seat frame assembly to move forward and backward relative to the base assembly.

4. The adjustable seat cushion structure according to claim 1 or 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 shielding the corresponding teeth.

5. The adjustable seat cushion structure according to claim 1 or 3, characterized in that: The sector angle corresponding to the teeth ranges from 150° to 250°.

6. The adjustable seat cushion structure according to claim 2, wherein: A rear transverse tube is rotatably connected between the two seat frame side plates. Two ends of the rear transverse 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.

7. The adjustable seat cushion structure according to claim 2, characterized in that: The base assembly includes two parallel sliding rail assemblies, two fixed brackets connected to the relatively inner sides of the two sliding rail assemblies, and two rear fixed plates connected to the relatively outer sides of the two sliding 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 and connect the backrest assembly.

8. The adjustable seat cushion structure according to claim 7, characterized in that: The connecting rod drive assembly also includes two front connecting rods, the upper ends of the two front connecting rods are arranged to rotate relative to the seat frame assembly, the lower ends of the two front connecting rods are respectively connected to the two fixed brackets for rotation, and the axis of rotation of the front connecting rods relative to the seat frame assembly is parallel to the axis of rotation of the first rear connecting rod relative to the seat frame assembly.

9. The adjustable seat cushion structure according to 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. A seat, characterized in that: It comprises a backrest assembly and an adjustable seat cushion structure as described in any one of claims 1 to 9, wherein the backrest assembly is rotatably connected to the base assembly and is configured so 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.

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