Linear drive unit and seat containing it

Abstract

This application provides a linear drive device and a seat including the same. The linear drive device includes: a drive unit for providing rotary motion; a lead screw and nut mechanism including a cooperating lead screw and nut; and a support unit connected to an external load-bearing structure. One end of the lead screw is provided with a connecting portion extending into the support unit. The drive unit connects to the connecting portion, enabling the lead screw and nut mechanism to receive the rotary motion provided by the drive unit and output linear motion. Furthermore, the support unit has a support surface perpendicular to the axial direction of the lead screw, and the connecting portion abuts against the support surface, allowing the axial force on the lead screw to be transmitted to the load-bearing structure through the support unit.

Description

Technical Field

[0001] This application relates to a linear drive device and a seat containing the same. Background Technology

[0002] To enhance the user experience, car seats, for example, widely adopt linear drive devices to make the seats adjustable. For instance, linear drive devices are used to adjust the height of the seat cushion, or the angle of the seat cushion, backrest, leg rest, and other structures.

[0003] However, with the increasing demand for the reliability and safety of seats, linear drive systems need to be safe and reliable under increasingly severe collision conditions. Furthermore, as seat products become more complex and heavier, the workload of linear drive systems increases, leading to increasingly higher requirements for the load-bearing capacity of linear drive systems in this field. In addition, when linear drive systems operate under heavy loads, they also generate significant noise, which negatively impacts the user experience.

[0004] In view of the above, the inventors of this application propose a new linear drive device and seat to solve at least one or a combination of the above technical problems. Utility Model Content

[0005] The purpose of this application is to provide a linear drive device.

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

[0007] According to a first aspect of this application, a linear drive device is used for seat adjustment. The linear drive device includes: a drive unit for providing rotational motion; a lead screw and nut mechanism including a cooperating lead screw and nut; and a support unit connected to an external load-bearing structure. One end of the lead screw is provided with a connecting portion extending into the support unit. The drive unit connects to the connecting portion, enabling the lead screw and nut mechanism to receive the rotational motion provided by the drive unit and output linear motion. Furthermore, the support unit has a support surface perpendicular to the axial direction of the lead screw, and the connecting portion abuts against the support surface, such that the axial force on the lead screw is transmitted to the external load-bearing structure through the support unit.

[0008] Through in-depth research, the inventors of this application discovered that in ordinary linear drive devices, the axial force on the lead screw and nut mechanism is directly transmitted to the drive unit. Excessive axial force can cause the drive unit to fail, adversely affecting the reliability and safety of the seat, and causing excessive load on the drive unit, resulting in significant noise. This application employs a support part design, allowing the axial force on the lead screw and nut mechanism to be transmitted to the external load-bearing structure through the support part without passing through the drive unit, significantly reducing the load on the drive unit. The drive unit only needs to bear the torque load used to drive the lead screw to rotate. Furthermore, when the load on the drive unit is reduced, its noise problem is significantly improved. And, since the drive unit does not need to bear the load along the axial direction of the lead screw, the strength requirements for the drive unit are reduced, which helps to save costs.

[0009] In one or more embodiments of the linear drive device, the support surface includes a first support surface and a second support surface, which are disposed facing each other to provide opposing support to the connecting portion; the connecting portion has a first surface that contacts the first support surface and a second surface that contacts the second support surface.

[0010] In one or more embodiments of the linear drive device, the support portion is provided with multiple sets of first support surfaces and second support surfaces; the connecting portion is correspondingly provided with multiple sets of first surfaces and second surfaces.

[0011] In one or more embodiments of the linear drive device, the support includes a first member and a second member detachably connected to the first member, the first member having a connection structure connecting to the external load-bearing structure, the first member and the second member jointly defining a receiving space for the connection, and at least one of the first member and the second member providing the support surface.

[0012] In one or more embodiments of the linear drive device, the first member and the second member jointly provide the support surface; and the first member is provided with a first limiting portion and the second member is provided with a second limiting portion, the first limiting portion and the second limiting portion cooperating to define the relative position of the first member and the second member along the axial direction of the lead screw.

[0013] In one or more embodiments of the linear drive device, the drive unit includes an assembly unit consisting of a motor and a transmission component, wherein the rotational motion provided by the motor is transmitted to the lead screw component through the transmission component.

[0014] In one or more embodiments of the linear drive device, the lead screw and the connecting part are integrally formed as a single piece; or, the lead screw and the connecting part are separate, with the two ends of the connecting part respectively matched and connected to the lead screw and the drive part.

[0015] In one or more embodiments of the linear drive device, the drive portion and the support portion are installed independently of each other; and / or, the support portion and the connecting portion are further provided with contacting cylindrical surfaces; and / or, the lead screw and nut mechanism further includes a sleeve, the sleeve being sleeved on the outside of the lead screw and connected to the nut; and / or, the contacting surfaces of the support portion and the connecting portion are provided with recesses.

[0016] A seat according to a second aspect of this application includes a load-bearing structure, a movable structure, and the linear drive device described above; wherein the support portion is connected to the load-bearing structure, the nut is connected to the movable structure, the linear drive device is capable of outputting linear motion to drive the movable structure, and the axial force of the lead screw and nut mechanism is transmitted to the load-bearing structure through the support portion.

[0017] In one or more embodiments of the seat, the load-bearing structure includes a base frame and a mounting bracket, and the movable structure includes a height adjustment link and a seat cushion bracket; the support portion is rotatably connected to the base frame via the mounting bracket, and the drive portion and the support portion are respectively disposed on the mounting bracket; the height adjustment link is rotatably connected to the base frame, and one end of the height adjustment link is connected to the nut, and the other end is connected to the seat cushion bracket; the linear drive device drives the height adjustment link, causing the height adjustment link to rotate relative to the base frame to adjust the height of the seat cushion bracket; the axial force on the screw-nut mechanism is transmitted to the load-bearing structure through the support portion. 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 structure of a linear drive device according to an embodiment.

[0020] Figure 2 This is an exploded schematic diagram of a linear drive device according to an embodiment.

[0021] Figure 3 This is an exploded schematic diagram of a linear drive device according to an embodiment.

[0022] Figure 4 This is an exploded schematic diagram of a linear drive device according to an embodiment.

[0023] Figure 5 This is a schematic diagram of the drive unit in one embodiment.

[0024] Figure 6 This is a schematic diagram of the structure of a linear drive device according to an embodiment.

[0025] Figure 7 This is an exploded schematic diagram of a linear drive device according to an embodiment.

[0026] Figure 8 This is an exploded schematic diagram of a linear drive device according to an embodiment.

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

[0028] Figure 10 This is a partial schematic diagram of a seat according to one embodiment.

[0029] Figure 11 This is a partial schematic diagram of a seat according to one embodiment.

[0030] Figure label:

[0031] 1. Seat;

[0032] 10. Linear drive device;

[0033] 110. Drive unit; 111. Motor; 112. Transmission component; 113. Mounting hole; 120. Screw and nut mechanism; 121. Screw component; 122. Nut component; 123. Connecting part; 124. First surface; 125. Second surface; 126. Annular protrusion; 127. Sleeve; 130. Support part; 131. Support surface; 132. First support surface; 133. Second support surface; 134. First component; 135. Second component; 136. First limiting part; 137. Second limiting part; 138. First hole; 139. Second hole; 1310. Connecting structure; 1311. Annular groove; 1312. Cylindrical inner surface;

[0034] 20. Load-bearing structure; 21. Base frame; 22. Mounting bracket;

[0035] 30. Movable structure; 31. Height adjustment linkage; 32. Seat cushion support. 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 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. In the following description, the orientation or positional relationship indicated by terms such as "upper," "lower," "inner," "outer," "front," "rear," or other directional terms is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and / or implemented in a specific orientation, and therefore should not be construed as a limitation of the application. In this application, the terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying positional relationships or order of importance. 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.

[0038] It is understood that the linear drive device and seat provided in this application are particularly suitable for automobiles, but can also be applied to other applicable occasions, such as rail trains, ships, and aircraft, as well as applicable fixed places, such as meeting rooms, auditoriums, and cinemas. As long as the seat can use the linear drive device disclosed in the embodiments of this application, it is not limited thereto.

[0039] See Figures 1 to 8The linear drive device 10 shown (also called a spindle drive) is used for seat 1 adjustment. It includes a drive unit 110, a lead screw and nut mechanism 120, and a support unit 130. The drive unit 110 provides rotational motion. The lead screw and nut mechanism 120 includes a cooperating lead screw 121 (also called a lead rod) and a nut 122. The support unit 130 is connected to an external load-bearing structure 20. One end of the lead screw 121 is provided with a connecting portion 123. The support unit 130 provides a receiving space for the connecting portion 123, which extends into the receiving space. The drive unit 110 is connected to the connecting portion 123, so that the lead screw and nut mechanism 120 can receive the rotational motion provided by the drive unit 110 and output linear motion. The support unit 130 is provided with a support surface 131 perpendicular to the axial direction of the lead screw 121. The connecting portion 123 abuts against the support surface 131, so that the axial force on the lead screw 121 is transmitted to the external load-bearing structure 20 through the support unit 130.

[0040] Specifically, the lead screw and nut mechanism 120 refers to a mechanism that converts rotary motion into linear motion using the principle of helical transmission; generally, the lead screw 121 and the nut 122 are in sliding fit; in some embodiments, the nut 122 may also be configured with a circulating structure of several balls, thereby forming a mechanism similar to a "ball screw mechanism", but not limited thereto; the drive unit 110 refers to a structure capable of providing rotary motion; generally, the drive unit 110 is equipped with a motor 111; the drive unit 110 may also be an assembly composed of a motor 111 and several transmission components 112, but not limited thereto; the support unit 130 has openings on both sides respectively. The screw nut mechanism 120 has a first hole 138 and a second hole 139. The screw nut 121 extends outward from the support portion 130 through the first hole 138, and the connecting portion 123 and the driving portion 110 are connected through the second hole 139. The axial force on the screw nut mechanism 120 is borne by the support surface 131, and thus transmitted to the outside through the support portion 130 without passing through the driving portion 110. The support portion 130 and the external load-bearing structure 20 have appropriate strength, stiffness, etc., to meet the load-bearing requirements. Correspondingly, the output end of the driving portion 110 bears the torque load that causes the screw nut 121 to rotate, but does not bear the axial force transmitted from the screw nut mechanism 120.

[0041] Through in-depth research, the inventors of this application discovered that a key reason why ordinary linear drive devices fail to meet relevant requirements is that excessive axial force on the lead screw and nut mechanism is directly transmitted to the drive unit, leading to drive unit failure. For example, the drive unit may lose its locking ability and fail to effectively support the adjustable structure, which adversely affects the reliability and safety of the seat and generates significant noise. This application employs a support part 130 design, which allows the axial force on the lead screw and nut mechanism 120 to be transmitted to the external load-bearing structure 20 through the support part 130 without passing through the drive unit 110. This significantly reduces the load on the drive unit 110, which only needs to bear the torque load to provide rotational power to the lead screw and nut mechanism 120. Furthermore, when the load on the drive unit 110 is reduced, its noise problem is significantly improved, and the reduced strength requirements for the drive unit 110 help save costs.

[0042] The support portion 130 can be the structure shown in the figure, or it can be any other structure, as long as it can accommodate the connecting portion 123 and provide the support surface 131; it is not limited thereto. Figures 2 to 4 As shown, in one or more embodiments, the support surface 131 includes a first support surface 132131 and a second support surface 133131, which are arranged opposite to each other to provide support for the connecting portion 123 in two opposite directions along the axis of the lead screw 121, respectively. The connecting portion 123 is provided with a first surface 124 that contacts the first support surface 132131 and a second surface 125 that contacts the second support surface 133131. This design allows both loads positively directed towards the drive portion 110 and loads negatively directed towards the drive portion 110 along the axis of the lead screw 121 to be transmitted to the outside through the support portion 130.

[0043] like Figure 7 , Figure 8 As shown, in one or more embodiments, the support portion 130 is provided with multiple sets of first support surfaces 132131 and second support surfaces 133131, and the connecting portion 123 is correspondingly provided with multiple sets of first surfaces 124 and second surfaces 125; for example, as shown in the figure, the support portion 130 is provided with three annular grooves 1311, and each annular groove 1311 can provide a set of first support surfaces 132131 and second support surfaces 133131 on both sides; the connecting portion 123 is correspondingly provided with three annular protrusions 126, and each annular protrusion 126 can provide a set of first surfaces 124 and second surfaces 125.

[0044] In one or more embodiments, the support portion 130 includes a first member 134 and a second member 135 detachably connected to the first member 134, for example, by bolts. The first member 134 and the second member 135 together define a receiving space for the connection portion 123, and at least one of the first member 134 and the second member 135 provides a support surface 131. In other words, a support surface 131 may be formed by one of the first member 134 or the second member 135, or it may be formed by both the first member 134 and the second member 135. For example... Figure 2 As shown, the first component 134 and the second component 135 can be a housing and an end cap, respectively. The housing is provided with one of the first support surface 132131 and the second support surface 133131, and the end cap is provided with the other of the first support surface 132131 and the second support surface 133131; or as shown... Figure 7 As shown, the first component 134 and the second component 135 can also be two roughly equivalent components. Both the first component 134 and the second component 135 are provided with partial annular grooves 1311. The first component 134 and the second component 135 are spliced ​​together to form a complete annular groove 1311, thereby jointly forming a support surface 131. The support part 130 is used to connect to the load-bearing structure 20. The connection structure 1310 can be provided only in one of the first component 134 or the second component 135, for example, it can be provided on the box. Through the design of the first component 134 and the second component 135, it is convenient to assemble the connecting part 123 inside the support part 130.

[0045] like Figures 6 to 8 As shown, in one or more embodiments, the first component 134 and the second component 135 together form the support surface 131; and the first component 134 is provided with a first limiting portion 136, and the second component 135 is provided with a second limiting portion 137. The first limiting portion 136 and the second limiting portion 137 cooperate to limit the relative position of the first component 134 and the second component 135 along the axial direction of the lead screw 121. Through the design of the first limiting portion 136 and the second limiting portion 137, it is ensured that the first component 134 and the second component 135 are properly assembled, reducing the relative displacement of the first component 134 and the second component 135 in the axial direction of the lead screw 121, thereby ensuring that the support surface 131 formed by the first component 134 and the second component 135 is flat and avoiding the first component 134 and the second component 135 from clamping the connecting portion 123 too tightly, etc.

[0046] like Figure 5As shown, in one or more embodiments, the drive unit 110 includes an assembly unit consisting of a motor 111 and a plurality of transmission components 112. The rotational motion provided by the motor 111 is transmitted to the lead screw 121 through the transmission components 112. The plurality of transmission components 112 mentioned herein may be gear assemblies (gearboxes), forming an assembly unit similar to the "geared motor 111" commonly used in the art, but is not limited thereto; the drive unit 110 may also be composed of multiple separate assemblies such as the motor 111 and the transmission components 112, and is not limited thereto.

[0047] In one or more embodiments, the lead screw 121 and the connecting part 123 are integrally manufactured as a single piece. This design effectively improves the overall strength of the lead screw 121 and the connecting part 123, making them more suitable for heavy load conditions.

[0048] In one or more embodiments, the lead screw 121 and the connecting part 123 are two separate individual parts, with the two ends of the connecting part 123 respectively matching and connecting the lead screw 121 and the drive part 110. This design allows the lead screw 121 and the connecting part 123 to be replaced separately, and is suitable for configuring the connecting part 123 and the support part 130 as an assembly unit, thereby realizing a modular design. By inserting the support part 130 and the connecting part 123 between the lead screw nut mechanism 120 and the drive part 110 of the ordinary linear drive device 10, the load-bearing capacity of the linear drive device 10 is improved, and the versatility of the connecting part 123 and the support part 130 is enhanced.

[0049] In one or more embodiments, the drive portion 110 and the support portion 130 are mounted independently of each other; for example Figure 6 As shown, the support portion 130 is provided with a connecting structure 1310 for mounting to its corresponding mounting position, and the drive portion 110 is also provided with a mounting hole 113 and other structures for mounting to the corresponding mounting position. Compared with some embodiments where the drive portion 110 is mounted on the support portion 130, this design reduces the interaction between the drive portion 110 and the support portion 130, further improving the reliability of the linear drive device 10.

[0050] like Figure 3 , Figure 8 As shown, in one or more embodiments, the support portion 130 and the connecting portion 123 are further provided with contacting cylindrical surfaces. In other words, the support portion 130 is provided with a cylindrical inner surface 1312 and is sleeved on the cylindrical outer surface of the connecting portion 123. This design is beneficial to improving the installation accuracy of the lead screw 121 and provides radial support to the connecting portion 123 through the support portion 130, further reducing the load on the drive portion 110.

[0051] like Figure 2As shown, in one or more embodiments, the lead screw and nut mechanism 120 further includes a sleeve 127, which is sleeved on the outside of the lead screw 121 and connected to the nut 122 at one end, so that the linear motion of the nut 122 on the lead screw 121 is converted into the telescopic motion formed by the sleeve 127 and the lead screw 121. The sleeve 127 also helps to protect the lead screw 121.

[0052] In one or more embodiments, the surfaces of the support portion 130 and the connecting portion 123 that come into contact are provided with recesses. For example, a groove is provided on the cylindrical inner surface 1312 of the support portion 130. While ensuring the support effect of the support portion 130 on the connecting portion 123, the recesses are provided to reduce the contact area, which is beneficial to further improve friction and noise problems. The recesses can also be used to form a storage space for lubricating oil, and are not limited thereto.

[0053] It is understood that in some embodiments, the linear drive device 10 is configured such that the connecting part 123 is appropriately disposed on the nut 122, which is also within the scope of the technical essence of this application; in other words, the connection order of the lead screw 121 and the nut 122 can be changed in an appropriate manner, the drive unit 110 drives the nut 122 to rotate, and the lead screw 121 cooperates with the nut 122 to output linear motion and connect to the structure adjusted by the linear drive device 10; for example, the lead screw nut mechanism 120 includes a sleeve 127, one end of the sleeve 127 is fixedly connected to the nut 122, and the other end is provided with a connecting part 123. The lead screw 121 is connected to the nut 122 and extends into the sleeve 127. The drive unit 110 drives the sleeve 127 and the nut 122 to rotate through the connecting part 123, so that the lead screw 121 outputs linear motion to the outside, which is not limited thereto.

[0054] like Figure 9 The seat 1 shown includes a load-bearing structure 20, a movable structure 30, and a linear drive device 10. The load-bearing structure 20 refers to the structure that bears the load transmitted from the support portion 130, and the movable structure 30 is a structure that can move relative to the load-bearing structure 20. It can be understood that the movement between the load-bearing structure 20 and the movable structure 30 is relative; therefore, it does not mean that the load-bearing structure 20 is necessarily a relatively fixed part of the whole, or that the movable structure 30 is necessarily a relatively movable part of the whole. The load-bearing structure 20, the linear drive device 10, and the movable structure 30 are connected sequentially. Specifically, the support portion 130 is connected to the load-bearing structure 20, the nut 122 is connected to the movable structure 30, the linear drive device 10 can output linear motion to drive the movable structure 30, and the axial force of the screw-nut mechanism 120 is transmitted to the load-bearing structure 20 through the support portion 130. The movable structure 30 can be a seat cushion, backrest, headrest, leg rest, etc., as long as it is a structure that can be adjusted using the linear drive device 10 provided in this application; it is not limited to these structures.

[0055] like Figure 10 , Figure 11 As shown, in one or more embodiments, the load-bearing structure 20 includes a base frame 21 and a mounting bracket 22, and the movable structure 30 includes a height adjustment link 31 and a seat cushion bracket 32; the support part 130 is rotatably connected to the base frame 21 through the mounting bracket 22, and the drive part 110 and the support part 130 are respectively disposed on the mounting bracket 22; the height adjustment link 31 is rotatably connected to the base frame 21, and one end of the height adjustment link 31 is connected to the nut 122, and the other end is connected to the seat cushion bracket 32; the linear drive device 10 drives the height adjustment link 31, causing the height adjustment link 31 to rotate relative to the base frame 21, thereby driving the seat cushion bracket 32 ​​to adjust the height of the seat cushion bracket 32 ​​and the seat cushion; the axial force on the screw nut mechanism 120 is transmitted to the load-bearing structure 20 through the support part 130.

[0056] In summary, the advanced technical effects of this application include, but are not limited to, at least one of the following:

[0057] This application employs a support design, which allows the axial force on the lead screw and nut mechanism to be transmitted to the external load-bearing structure through the support without passing through the drive unit. This significantly reduces the load on the drive unit, which only needs to bear the torque load to drive the lead screw to rotate. Furthermore, when the load on the drive unit is reduced, its noise problem is significantly improved, and the reduced strength requirements of the drive unit help save costs.

[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 linear drive device (10) for adjusting a seat (1), characterized in that, include: A drive unit (110) is used to provide rotational motion; The lead screw and nut mechanism (120) includes a matching lead screw (121) and a nut (122); The support part (130) connects to the external load-bearing structure (20); wherein, One end of the lead screw (121) is provided with a connecting portion (123) extending into the support portion (130); the drive portion (110) is connected to the connecting portion (123), so that the lead screw nut mechanism (120) can receive the rotational motion provided by the drive portion (110) and output linear motion; and, The support portion (130) is provided with a support surface (131) perpendicular to the axial direction of the lead screw (121), and the connecting portion (123) abuts against the support surface (131), so that the axial force on the lead screw (121) is transmitted to the load-bearing structure (20) through the support portion (130).

2. The linear drive device (10) according to claim 1, characterized in that, The support surface (131) includes a first support surface (132) and a second support surface (133), which are arranged opposite to each other to provide opposing support for the connecting portion (123); the connecting portion (123) is provided with a first surface (124) that contacts the first support surface (132) and a second surface (125) that contacts the second support surface (133).

3. The linear drive device (10) according to claim 2, characterized in that, The support portion (130) is provided with multiple sets of first support surfaces (132) and second support surfaces (133); the connecting portion (123) is correspondingly provided with multiple sets of first surfaces (124) and second surfaces (125).

4. The linear drive device (10) according to claim 1, characterized in that, The support portion (130) includes a first component (134) and a second component (135) detachably connected to the first component (134). The first component (134) and the second component (135) together define the receiving space of the connection portion (123), and at least one of the first component (134) and the second component (135) is provided with the support surface (131).

5. The linear drive device (10) according to claim 4, characterized in that, The first component (134) and the second component (135) jointly provide the support surface (131); and the first component (134) is provided with a first limiting portion (136), and the second component (135) is provided with a second limiting portion (137). The first limiting portion (136) and the second limiting portion (137) cooperate to limit the relative position of the first component (134) and the second component (135) along the axial direction of the lead screw (121).

6. The linear drive device (10) according to claim 1, characterized in that, The drive unit (110) is an assembly unit consisting of a motor (111) and a transmission component (112), wherein the rotational motion provided by the motor (111) is transmitted to the lead screw component (121) through the transmission component (112).

7. The linear drive device (10) according to claim 1, characterized in that, The lead screw (121) and the connecting part (123) are integrally formed single pieces; or, the lead screw (121) and the connecting part (123) are separate pieces, with the two ends of the connecting part (123) respectively matching and connecting the lead screw (121) and the driving part (110).

8. The linear drive device (10) according to claim 1, characterized in that, The drive unit (110) and the support unit (130) are installed independently of each other; and / or, the support unit (130) and the connecting unit (123) are also provided with contacting cylindrical surfaces; and / or, the lead screw and nut mechanism (120) further includes a sleeve (127), which is sleeved on the outside of the lead screw (121) and connected to the nut (122); and / or, the contacting surfaces of the support unit (130) and the connecting unit (123) are provided with recesses.

9. A seat (1), characterized in that, It includes a load-bearing structure (20), a movable structure (30), and a linear drive device (10) as described in any one of claims 1 to 8; wherein the support portion (130) is connected to the load-bearing structure (20), the nut (122) is connected to the movable structure (30), the linear drive device (10) is capable of outputting linear motion to drive the movable structure (30), and the axial force of the screw nut mechanism (120) is transmitted to the load-bearing structure (20) through the support portion (130).

10. The seat (1) according to claim 9, characterized in that, The load-bearing structure (20) includes a base frame (21) and a mounting bracket (22). The movable structure (30) includes a height adjustment link (31) and a seat cushion bracket (32). The support part (130) is rotatably connected to the base frame (21) through the mounting bracket (22). The drive part (110) and the support part (130) are respectively disposed on the mounting bracket (22). The height adjustment link (31) is rotatably connected to the base frame (21), and one end of the height adjustment link (31) is connected to the nut (122), and the other end is connected to the seat cushion bracket (32). The linear drive device (10) drives the height adjustment link (31) so that the height adjustment link (31) rotates relative to the base frame (21) to adjust the height of the seat cushion bracket (32). The axial force on the screw nut mechanism (120) is transmitted to the load-bearing structure (20) through the support part (130).

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