Backrest adjusting assembly and seat

Abstract

The utility model provides a backrest adjusting assembly and a seat. The backrest adjusting assembly comprises a first supporting part and a second supporting part, the second supporting part is pivotally connected to the first supporting part around a first axis and is positioned on the upper side of the first supporting part in the height direction; a drive unit; the adjusting part comprises a first adjusting part and a second adjusting part; the first supporting part and the second supporting part are each provided with a first side and a second side in the width direction, wherein the first side and the second side are opposite. The first adjusting part and the second adjusting part are respectively arranged on the first side and the second side, are respectively pivotally connected to the first supporting part around a second axis and are respectively pivotally connected to the second supporting part around a third axis; the first adjusting part and the second adjusting part can be driven by the driving part so as to adjust the included angle between the first supporting part and the second supporting part.

Description

Technical Field

[0001] This application relates to a backrest adjustment assembly and a seat. Background Technology

[0002] Seating products, taking car seats as an example, generally include a backrest; in order to improve the user experience and make the backrest adjustable to suit passengers of different body types and postures, some seat backrests are equipped with backrest adjustment components to realize the upper backrest adjustment function (or UBA function), so that the tilt angle of the upper part of the backrest relative to the lower part can be adjusted.

[0003] However, with increasingly stringent safety requirements for seating products, especially those with integrated seat belts, the inventors of this application have discovered that some comparative solutions' backrest adjustment components suffer from low structural stability, insufficient strength and rigidity, and low reliability of adjustment functions, such as failure during crash tests. Furthermore, there is a need in the art to further increase the angle adjustment range of the backrest adjustment components, improve the user experience, and reduce costs.

[0004] Therefore, there is a need in the field to continue developing backrest adjustment components and seats to solve one or a combination of the above technical problems. Utility Model Content

[0005] The purpose of this application is to provide a backrest adjustment component.

[0006] Another objective of this application is to provide a seat.

[0007] A backrest adjustment assembly according to a first aspect of this application includes: a first support portion; a second support portion pivotally connected to the first support portion about a first axis and located above the first support portion in the height direction; a drive portion for outputting a drive force; and an adjustment portion including: a first adjustment portion and a second adjustment portion; wherein the first support portion has opposing first support portion first side and second support portion second side in the width direction; the second support portion has opposing second support portion first side and second support portion second side in the width direction; the first adjustment portion is pivotally connected to the first support portion first side about a second axis and pivotally connected to the second support portion first side about a third axis; the second adjustment portion is pivotally connected to the first support portion second side about the second axis and pivotally connected to the second support portion second side about the third axis; the first adjustment portion and the second adjustment portion can be driven by the drive portion to adjust the included angle of the first support portion and the second support portion.

[0008] The backrest adjustment assembly described above, with the first and second adjustment parts respectively positioned on both sides of the width direction, allows the driving force output by the drive unit to be evenly transmitted on both sides, ensuring the reliability of the adjustment function. Furthermore, it provides support on both sides to improve structural stability, strength, and stiffness. Additionally, it exhibits good impact load distribution during collisions and ensures relatively even deformation on both sides, enabling it to withstand larger impact loads and reducing the risk of adjustment function failure. The first and second support parts are pivotally connected around the first axis, the first support part is pivotally connected to the first and second adjustment parts around the second axis, and the second support part is pivotally connected to the first and second adjustment parts around the third axis, achieving a simplified structure, reliable function, and lower manufacturing costs.

[0009] In one or more embodiments of the backrest adjustment assembly, the drive unit includes a motor and a connecting shaft; the first adjustment unit and the second adjustment unit respectively include a gear assembly and a lead screw and nut assembly, the lead screw and nut assembly including a nut and a lead screw connected together; wherein, the motor is connected to the gear assembly via the connecting shaft; the gear assembly and the nut are connected and pivotally connected to the first support unit about a second axis; one end of the lead screw is pivotally connected to the second support unit about a third axis; the rotation output by the motor is transmitted to the gear assembly via the connecting shaft, causing the gear assembly to be driven and output rotation to the nut, the lead screw being driven by the nut and outputting linear movement in the height direction; the lead screw can move downward relative to the nut, causing the second support unit to rotate rearward.

[0010] In one or more embodiments of the backrest adjustment assembly, the gear assembly is housed inside the housing to form a gearbox.

[0011] In one or more embodiments of the backrest adjustment assembly, a accommodating space for the seatbelt retractor is provided between the first side and the second side of the second support portion, and near the second side of the second support portion; the second adjustment portion includes a cylindrical structure sleeved on the outer periphery of the lead screw member.

[0012] In one or more embodiments of the backrest adjustment assembly, the drive unit includes a bracket; the rotation axis of the motor and the connecting shaft extend in the width direction; and the motor and the connecting shaft are disposed between a first side of the first support portion and a second side of the first support portion, and are supported by the bracket.

[0013] In one or more embodiments of the backrest adjustment assembly, the connecting shaft is a flexible shaft.

[0014] In one or more embodiments of the backrest adjustment assembly, a first support is provided on a first side and a second side of the first support; the first adjustment part is pivotally connected to the first support on the first side of the first support, and the second adjustment part is pivotally connected to the first support on the second side of the first support.

[0015] In one or more embodiments of the backrest adjustment assembly, a second support is provided on a first side and a second side of the second support portion, respectively; the first adjustment portion is pivotally connected to the second support on the first side of the second support portion, and the second adjustment portion is pivotally connected to the second support on the second side of the second support portion.

[0016] According to a second aspect of this application, a seat includes a backrest, the backrest being provided with a backrest adjustment assembly as described in any of the above embodiments, wherein the angle between the first support portion and the second support portion is adjusted by the backrest adjustment assembly, thereby adjusting the shape of the backrest.

[0017] In one or more embodiments of the seat, the seat is a seat with an integrated seat belt. Attached Figure Description

[0018] The above and other features, properties, and advantages of this application will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features. It should be noted that these drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the scope of protection actually claimed by this application, wherein:

[0019] Figure 1 This is a schematic diagram of the backrest adjustment assembly in the first position according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the backrest adjustment assembly in the second position according to an embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the structure of the first support portion according to an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the structure of the second support portion according to an embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the structure of the drive unit, the first adjustment unit, and the second adjustment unit according to an embodiment of this application.

[0024] Figure 6 This is a schematic diagram of the structure of a gearbox according to an embodiment of this application.

[0025] Figure 7 This is a schematic diagram of the structure of a lead screw component according to an embodiment of this application.

[0026] Figure 8 This is a schematic diagram of the structure of the drive unit according to an embodiment of this application.

[0027] Figure 9 This is a structural schematic diagram of a seat according to an embodiment of this application.

[0028] Figure 10 This is a schematic diagram of the backrest structure according to an embodiment of this application.

[0029] Figure 11 This is a schematic diagram of a cylindrical structure according to an embodiment of this application.

[0030] Figure 12 This is a schematic diagram of the cylindrical structure and shell according to an embodiment of this application.

[0031] Figure label:

[0032] 1. Seat;

[0033] 10. Backrest; 20. Seatbelt retractor;

[0034] 100. Backrest adjustment assembly; 110. First support part; 111. First side of the first support part; 112. Second side of the first support part; 113. First support; 120. Second support part; 121. First side of the second support part; 122. Second side of the second support part; 123. Second support; 130. Drive part; 131. Motor; 132. Connecting shaft; 133. Bracket; 140. Adjustment part; 141. First adjustment part; 142. Second adjustment part; 143. Gear assembly; 1431. Housing; 144. Lead screw and nut assembly; 1441. Lead screw component; 145. Cylindrical structure;

[0035] X1. First axis; X2. Second axis; X3. Third axis. Detailed Implementation

[0036] Reference will now be made in detail to various embodiments of this application, examples of which are shown in the accompanying drawings and described below. Although this application will be described in conjunction with exemplary embodiments, it should be understood that this application is not intended to be limited to those exemplary embodiments. Rather, this application is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of this application as defined by the appended claims.

[0037] This application uses specific terms to describe embodiments of the application. For example, "an embodiment" and / or "one embodiment" refers to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" mentioned twice or more in different locations in this application does not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0038] In this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying positional relationships or order of importance.

[0039] In the following description, unless otherwise defined, the orientation or positional relationship indicated by the terms "upper," "lower," "inner," "outer," or other directional terms is based on the orientation or positional relationship shown in the accompanying drawings and is used only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and / or be implemented in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] In the following description, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly; for example, they can refer to fixed connections or movable connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0041] The terms "width direction," "height direction," and "length direction" used in this application are based on the seat. The "width direction" refers to the direction between the left and right sides of the seat, i.e., the x-direction in the figure. The "height direction" refers to the direction between the side of the seat back that is connected to the seat cushion and the side that is away from the seat cushion, i.e., the y-direction in the figure. The side of the seat back that is away from the seat cushion is the "upper side." The "length direction" is a direction that is perpendicular to both the width and height directions. In the length direction, the direction in which the seat faces is the "front side," and the direction in which the seat backs is facing is the "rear side." For example, the seat cushion is generally located on the front side of the backrest.

[0042] It is understood that the seat provided in this application is particularly suitable for automobile seats, but is not limited thereto. It can also be used in other applicable occasions, such as seats in other vehicles, seats in theaters and other venues, and other seats.

[0043] like Figure 1 , Figure 2As shown, this application provides a backrest adjustment assembly 100, which includes: a first support portion 110; a second support portion 120, pivotally connected to the first support portion 110 about a first axis X1, and located above the first support portion 110 in the height direction (y direction); a drive portion 130 for outputting a drive force; and an adjustment portion 140, including: a first adjustment portion 141 and a second adjustment portion 142; wherein the first support portion 110 has opposing first support portion first side 111 and first support portion second side 112 in the width direction (x direction); and the second support portion 120 has opposing second support portion first side 112 in the width direction. 21. Second side 122 of the second support portion; the first adjustment portion 141 is pivotally connected to the first side 111 of the first support portion about a second axis X2, and pivotally connected to the first side 121 of the second support portion about a third axis X3; the second adjustment portion 142 is pivotally connected to the second side 112 of the first support portion about a second axis X2, and pivotally connected to the second side 122 of the second support portion about the third axis X3; the first adjustment portion 141 and the second adjustment portion 142 can be driven by the drive portion 130 to adjust the included angle between the first support portion 110 and the second support portion 120.

[0044] Specifically, the drive unit 130 refers to a component or assembly that provides driving force to the backrest adjustment assembly 100, such as by electric, hydraulic, or pneumatic means. The drive unit 130 is generally configured as a motor, which can be a brushed motor, a brushless motor, etc., and the term "motor" here should be interpreted broadly, referring to either a standalone motor or a motor assembly consisting of a motor and gears, similar to the concept of a "geared motor" commonly used in the art, but not limited thereto. The adjustment unit 140 is driven by the driving force output by the drive unit 130 to adjust the angle between the first support unit 110 and the second support unit 120. Specifically, the adjustment unit 140 can be configured to move under the drive of the drive unit 130, thereby causing the second support unit 120 to rotate relative to the first support unit 110 around the first axis X1.

[0045] The backrest adjustment assembly 100 described above, by respectively arranging the first adjustment part 141 and the second adjustment part 142 on both sides in the width direction, ensures that the driving force output by the drive part 130 can be evenly transmitted on both sides, thus guaranteeing the reliability of the adjustment function. Furthermore, the adjustment part 140 provides support on both sides, improving structural stability, strength, and rigidity, enabling it to withstand larger tensile loads, especially suitable for seats with integrated seat belts. In addition, during a collision, the structure exhibits good impact load distribution on both sides, and minimizes deformation. The structure is relatively balanced, enabling it to withstand large energy impacts and preventing adjustment function failures, such as jamming. The first support part 110 and the second support part 120 are pivotally connected around the first axis X1. The first support part 110 is pivotally connected to the first adjustment part 141 and the second adjustment part 142 around the second axis X2. The second support part 120 is pivotally connected to the first adjustment part 141 and the second adjustment part 142 around the third axis X3. The structure is simple, the function is reliable, and the manufacturing cost is low.

[0046] like Figure 2 , Figure 5As shown, in one or more embodiments of the backrest adjustment assembly 100, the drive unit 130 includes a motor 131 and a connecting shaft 132. Specifically, the first adjustment unit 141 and the second adjustment unit 142 can be driven by the same motor 131 through the connecting shaft 132. For example, the motor 131 can be a dual-output shaft motor, with its two output shafts respectively connected to the first adjustment unit 141 and the second adjustment unit 142 through the connecting shaft 132, which helps to save costs. The first adjustment unit 141 and the second adjustment unit 142 respectively include a gear assembly 143 and a lead screw and nut assembly 144. The lead screw and nut assembly 144 includes a nut and a lead screw 1441 connected together. The motor 131 is connected to the gear assembly 143 through the connecting shaft 132. The gear assembly 143 and the nut are connected and pivotally connected to the first support unit 110 about the second axis X2. One end of the lead screw 1441 is connected to the first support unit 110. The third axis X3 is pivotally connected to the second support 120; the rotation output by the motor 131 is transmitted to the gear assembly 143 through the connecting shaft 132, so that the gear assembly 143 is driven and outputs rotation to the nut, and the lead screw 1441 is driven by the nut and outputs linear movement in the height direction; the design of the drive unit 130 and the adjustment unit 140 can achieve stable adjustment without vibration, jumping, or dead noise, thus improving the user experience of the backrest adjustment assembly 100, and the structure is simple, reliable, and low-cost; it also makes the angle adjustment range of the backrest adjustment assembly 100 limited by the stroke of the lead screw 1441, and different angle adjustment ranges of the backrest adjustment assembly 100 can be provided simply by adjusting the stroke (length) of the lead screw 1441, which has strong adaptability and adjustability; extending the length of the lead screw 1441 can expand the adjustment range, allowing the second support 120 to reach a larger tilt angle.

[0047] Specifically, the gear assembly 143 refers to a component that uses gear transmission principles for transmission, and does not mean that all components are gears in the narrow sense. For example, the gear assembly 143 may include a worm gear connected to the connecting shaft 132 and an output gear connected to the nut. One or more gears may also be provided between the worm gear and the output gear to adjust to the desired transmission ratio and direction, but this is not a limitation. The gear assembly 143 may also be housed inside the housing 1431 to form a gearbox. The housing 1431 provides support and protection for the gear assembly 143 to ensure its functional reliability. The lead screw and nut assembly 144 refers to a structure that converts rotational motion into linear motion through a lead screw and nut mechanism.

[0048] like Figure 1 , Figure 2 As shown, the lead screw 1441 moves downward relative to the nut, reducing the distance between the second axis X2 and the third axis X3. Consequently, the second support 120 tilts and rotates rearward relative to the first support 110 about the first axis X1, achieving the desired effect. Figure 1 The first position shown; the lead screw 1441 moves upward relative to the nut, increasing the distance between the second axis X2 and the third axis X3, thereby causing the second support 120 to rotate forward about the first axis X1, so as to achieve the following... Figure 2 The second position shown; this design allows the free end of the lead screw 1441, i.e., the end away from the second support 120, to extend downward and be approximately between the first side 111 and the second side 112 of the first support, providing a larger range of motion. This facilitates the use of a longer lead screw 1441 to provide a larger adjustment range for the backrest adjustment assembly 100, and allows the second support 120 to rotate to a larger tilt angle, etc.

[0049] like Figure 5 , Figure 8 As shown, in one or more embodiments of the backrest adjustment assembly 100, the drive unit 130 further includes a bracket 133; the rotation axis of the motor 131 and the connecting shaft 132 extend in the width direction, and the motor 131 and the connecting shaft 132 are disposed between the first side 111 and the second side 112 of the first support portion and are supported by the bracket 133; the motor 131, the connecting shaft 132, and the bracket 13 can also constitute a motor bracket assembly; this design provides a more practical arrangement of the drive unit 130, and the design of the bracket 133 improves the structural strength and vibration reduction performance of the drive unit 130; a large space can be provided between the first side 111 and the second side 112 of the first support portion for the movement of the lead screw 1441, which is conducive to expanding the angle adjustment range of the backrest adjustment assembly 100, and can reserve the space between the first side 121 and the second side 122 of the second support portion for arranging, for example, a seat belt retractor, etc., with reasonable local structure and full space utilization.

[0050] like Figure 5 , Figure 8As shown, in one or more embodiments of the backrest adjustment assembly 100, the connecting shaft 132 is a flexible shaft; the flexible shaft is flexible and can be used to connect two shafts along different axes, or in different directions, or with relative motion, so as to transmit rotational motion and torque more flexibly, and to facilitate the assembly and spatial arrangement of the drive unit 130 and the adjustment unit 140, etc.

[0051] like Figures 10 to 12 As shown, in one or more embodiments of the backrest adjustment assembly 100, a space for accommodating the seatbelt retractor 20 is provided between the first side 121 and the second side 122 of the second support portion, and near the second side 122 of the second support portion; the second adjustment portion 142 includes a cylindrical structure 145 sleeved on the outer periphery of the lead screw member 1441; specifically, the cylindrical structure 145 is connected to a load-bearing structure to transmit loads, for example, connected to one end of the upper side of the housing 1431, but not as such. For seats with integrated seat belts, the area on the side where the seat belt retractor 20 is located will be subjected to a significantly large impact load during a collision. In this case, the lead screw 1441 of the second adjustment part 142 is a key component to ensure the effective function of the backrest adjustment assembly 100. The cylindrical structure 145 can provide protection for the lead screw 1441 and absorb impact energy, so as to avoid the lead screw 1441 being directly impacted, effectively reducing the risk of failure of the lead screw 1441 and the risk of jamming of the backrest adjustment assembly 100.

[0052] like Figure 3 As shown, in one or more embodiments of the backrest adjustment assembly 100, the first support portion on the first side 111 and the first support portion on the second side 112 are respectively provided with first supports 113; the first adjustment portion 141 is pivotally connected to the first support portion on the first side 111 of the first support portion, and the second adjustment portion 142 is pivotally connected to the first support portion on the second side 112 of the first support portion; the design of the first support portion 113 is conducive to improving the load distribution on the first support portion 110, dispersing local stress, and in the event of wear, only the first support portion 113 can be replaced, avoiding the need to replace the entire first support portion 110, thereby saving costs.

[0053] In one or more embodiments of the backrest adjustment assembly 100, the first side 121 and the second side 122 of the second support portion are respectively provided with second supports 123; the first adjustment portion 141 is pivotally connected to the second support 123 on the first side 121 of the second support portion, and the second adjustment portion 142 is pivotally connected to the second support 123 on the second side 122 of the second support portion; the design of the second support 123 is conducive to improving the load distribution on the second support portion 120, dispersing local stress, and in the event of wear, only the second support 123 can be replaced, avoiding the need to replace the entire second support portion 120, thereby saving costs.

[0054] refer to Figure 9 , Figure 10 As shown, this application also provides a seat 1, which includes a backrest 10. The backrest 10 is provided with a backrest adjustment component 100 as described in any of the above embodiments. The backrest adjustment component 100 adjusts the included angle between the first support portion 110 and the second support portion 120, so that the shape of the backrest 10 is adjusted.

[0055] like Figure 10 As shown, in one or more embodiments of the seat 1, the seat 1 is a seat with an integrated seat belt; between the first side 121 and the second side 122 of the second support portion, and near the second side 122 of the second support portion, a space for accommodating the seat belt retractor 20 is provided; the second adjustment portion 142 includes a cylindrical structure 145, which is sleeved on the outer periphery of the lead screw 1441 and connected to a load-bearing structure to transmit loads, for example, connected to one end of the upper side of the housing 1431, but not limited thereto; For seats with integrated seat belts, the area on the side where the seat belt retractor 20 is located will be subjected to a significantly large impact load during a collision. In this case, the lead screw 1441 of the second adjustment part 142 is a key component to ensure the effective function of the backrest adjustment assembly 100. The cylindrical structure 145 can protect the lead screw 1441 and absorb impact energy to avoid the lead screw 1441 being directly impacted, effectively reducing the risk of failure of the lead screw 1441 and the risk of the backrest adjustment assembly 100 getting stuck.

[0056] In summary, the beneficial effects of the backrest adjustment assembly and seat described in the above embodiments include, but are not limited to, at least one of the following:

[0057] By having the first and second adjustment parts respectively positioned on both sides of the width direction, on the one hand, the driving force output by the drive unit can be evenly transmitted on both sides, thereby improving the reliability of the adjustment function; on the other hand, support is provided on both sides to enhance structural stability, strength, and stiffness, enabling it to withstand larger tensile loads, especially suitable for seats with integrated seat belts; furthermore, it has a better impact load distribution in a collision, and makes the deformation of the structure on both sides more balanced, enabling it to withstand large energy impacts and avoid adjustment function failure; by having the first and second support parts pivotally connected around the first axis, the first support part pivotally connected to the first and second adjustment parts pivotally connected around the second axis, and the second support part pivotally connected to the first and second adjustment parts pivotally connected around the third axis, the structure is simplified, the function is reliable, and the manufacturing cost is low.

[0058] While this application discloses preferred embodiments as described above, it is not intended to limit the scope of this application. Any changes and modifications can be made by those skilled in the art without departing from the spirit and scope of this application. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application, without departing from the content of the technical solution of this application, fall within the protection scope defined by the claims of this application.

Claims

1. A backrest adjustment assembly (100), characterized in that, The utility model relates to a kind of adjustable support, including: First support part (110); Second support part (120), pivotably connected to the first support part (110) around the first axis (X1), and located on the upper side of the first support part (110) in the height direction; Driving part (130) for output driving force; Adjusting part (140) includes: first adjusting part (141), second adjusting part (142);Wherein, The first support part (110) has the first support part first side (111) and the first support part second side (112) in the width direction;The second support part (120) has the second support part first side (121) and the second support part second side (122) in the width direction;The first adjusting part (141) is pivotably connected to the first support part first side (111) around the second axis (X2), and is pivotably connected to the second support part first side (121) around the third axis (X3);The second adjusting part (142) is pivotably connected to the first support part second side (112) around the second axis (X2), and is pivotably connected to the second support part second side (122) around the third axis (X3); The first adjusting part (141) and the second adjusting part (142) can be driven by the driving part (130) to adjust the included angle of the first support part (110) and the second support part (120).

2. The backrest adjustment assembly (100) according to claim 1, characterized in that The driving part (130) includes motor (131), connecting shaft (132);The first adjusting part (141) and the second adjusting part (142) respectively include gear assembly (143) and screw nut assembly (144), and the screw nut assembly (144) includes nut piece and screw rod piece (1441) connected;Wherein, The motor (131) is connected to the gear assembly (143) through the connecting shaft (132);The gear assembly (143) and the nut piece are connected, and are pivotably connected to the first support part (110) around the second axis (X2);One end of the screw rod piece (1441) is pivotably connected to the second support part (120) around the third axis (X3); The rotation output by the motor (131) is transmitted to the gear assembly (143) through the connecting shaft (132), so that the gear assembly (143) is driven and outputs rotation to the nut piece, and the screw rod piece (1441) is driven by the nut piece and outputs linear movement in the height direction;The screw rod piece (1441) can move downward relative to the nut piece so that the second support part (120) rotates to the rear side.

3. The backrest adjustment assembly (100) according to claim 2, characterized in that The gear assembly (143) is contained in the inside of shell (1431) to constitute gear box.

4. The backrest adjustment assembly (100) according to claim 2, characterized in that A seat belt retractor (200) is provided in a space between the first side (121) and the second side (122) of the second support part and close to the second side (122) of the second support part; the second adjusting part (142) comprises a cylindrical structure (145) sleeved on the outer circumferential side of the screw rod (1441).

5. The backrest adjustment assembly (100) according to claim 2, characterized in that The driving part (130) comprises a bracket (133); the rotation axis of the motor (131) and the connecting shaft (132) extend in the width direction; and the motor (131) and the connecting shaft (132) are arranged between the first side (111) and the second side (112) of the first support part and are supported by the bracket (133).

6. The backrest adjustment assembly (100) according to claim 2, characterized in that The connecting shaft (132) is a flexible shaft.

7. The backrest adjustment assembly (100) of claim 1, wherein, The first side (111) and the second side (112) of the first support part are respectively provided with a first support (113); the first adjusting part (141) is pivotally connected to the first support (113) of the first side (111), and the second adjusting part (142) is pivotally connected to the first support (113) of the second side (112).

8. The backrest adjustment assembly (100) of claim 1, characterized in that, The first side (121) and the second side (122) of the second support part are respectively provided with a second support (123); the first adjusting part (141) is pivotally connected to the second support (123) of the first side (121), and the second adjusting part (142) is pivotally connected to the second support (123) of the second side (122).

9. A seat (1) characterized in that A backrest (10) is provided with a backrest adjusting assembly (100) as claimed in any one of claims 1 to 8, the included angle of the first support part (110) and the second support part (120) is adjusted by the backrest adjusting assembly (100), so that the form of the backrest (10) is adjusted.

10. A seat (1) according to claim 9, characterized in that The seat (1) is a seat integrated with a safety belt.

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