Single drive backrest support four-way adjustment mechanism

Abstract

This utility model relates to the field of automotive seat technology and discloses a single-drive four-way adjustable backrest support mechanism, including a backrest spring frame, a synchronous drive assembly, and adjustment cables. The aforementioned single-drive four-way adjustable backrest support mechanism drives a first chain and a second chain to move simultaneously via a drive wheel, thereby controlling the tightening or loosening of four adjustment cables. This, in turn, pushes the backrest spring frame to conform to the human body as needed to provide support. It has advantages such as good overall integrity, light weight, simple molding, low cost, large support area, uniform force distribution, and resistance to wear and loosening, improving backrest comfort and reliability. It also greatly simplifies the drive system, reduces parts, and avoids abnormal noise. The synchronous drive assembly, as a modular design, is more in line with the current trend of lightweight and cost-effective vehicles, improving product competitiveness, and its simple structure makes it easier to match with all vehicle models.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to a single-drive backrest support four-way adjustment mechanism. Background Technology

[0002] Most modern car seats are equipped with adjustable electric backrests, allowing passengers to adjust them to their individual needs. Compared to fixed backrests, this design is more user-friendly and versatile. For four-way adjustment (forward / backward, up / down), a conventional two-way adjustment structure uses a lead screw drive mechanism consisting of a steel frame, plastic support plate, supporting steel plate, drive unit, lead screw, and slider. Four-way adjustment utilizes two sets of lead screw drive mechanisms to achieve the forward and backward movements of the up and down positions respectively. These products have numerous components, a complex drive unit structure, and a complicated assembly process, resulting in high overall cost, limited market competitiveness, and significant weight. Furthermore, due to the complex component structure and demanding manufacturing process, the finished backrests are prone to producing abnormal noises during use. Utility Model Content

[0003] The purpose of this utility model is to provide a single-drive backrest support four-way adjustment mechanism, which optimizes the existing implementation of backrest four-way adjustment, simplifies the structure, reduces assembly difficulty, reduces weight, improves noise issues, meets usage requirements, and enhances product competitiveness.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A single-drive four-way adjustable backrest support mechanism includes a backrest spring frame, a synchronous drive assembly, and an adjustment cable, wherein:

[0006] The backrest spring frame is a flexible steel wire skeleton structure and is set between the seat frame and the seat foam layer. Limiting buckles are set on the upper left, upper right, lower left and lower right parts of the backrest spring frame respectively.

[0007] The synchronous drive assembly includes a base, a drive wheel, a first chain, and a second chain. The base is fixed on the backrest spring frame, the drive wheel is rotatably mounted on the base, and the first chain and the second chain pass around the drive wheel and move synchronously with the rotation of the drive wheel.

[0008] There are at least four adjustment cables. Each of the four adjustment cables is fixedly connected to one of the four limit buckles. The first end of each of the four adjustment cables is connected to one of the two ends of the first chain and the two ends of the second chain. The second end of each of the four adjustment cables is connected to the seat frame.

[0009] As an alternative, the drive wheel is provided with two layers of toothed rings, each with a number of toothed grooves. The toothed grooves of the two layers of toothed rings are axially aligned. The first chain engages with one of the toothed rings for transmission, and the second chain engages with the other toothed ring for transmission. The first chain and the second chain are each provided with a number of chain nodes that are equidistantly distributed and engage with the toothed grooves.

[0010] As an alternative, when the first chain and the second chain move synchronously with the rotation of the drive wheel, and the ends of the first chain and the second chain are about to disengage from their corresponding toothed rings, the chain nodes at the ends remain engaged with the tooth grooves, so that the first chain and the second chain begin to move in opposite directions with the rotation of the drive wheel.

[0011] As an optional solution, four limit slots are provided on the base around the drive wheel, and four adjustment cables are located in the four limit slots respectively.

[0012] As an alternative, the bottom plane of the limiting groove where the two adjusting pull lines connected to the first chain are located is flush with the bottom surface of the toothed ring part of the corresponding layer; the bottom plane of the limiting groove where the two adjusting pull lines connected to the second chain are located is flush with the bottom surface of the toothed ring part of the corresponding layer.

[0013] As an alternative, the chain node includes a hinge shaft and a roller rotatably mounted on the hinge shaft, the roller making rolling contact with the sidewall of the limiting groove.

[0014] As an optional solution, the drive wheel is rotated by a motor, and the base has pre-drilled holes for motor mounting.

[0015] As an alternative, the two adjustment cables acting on the upper left and upper right of the backrest spring frame are simultaneously tightened or loosened when the drive wheel rotates; the two adjustment cables acting on the lower left and lower right of the backrest spring frame are simultaneously loosened or tightened when the drive wheel rotates.

[0016] As an optional solution, when the adjustment cable is tightened, the corresponding part on the backrest spring frame arches up to achieve the support and push-out function. The backrest spring frame is in direct contact with the seat foam layer and has a pre-push-out amount.

[0017] As an optional solution, the backrest spring frame includes vertical steel wires on both sides and several horizontal steel wires connecting the vertical steel wires on both sides, with limiting buckles set on the vertical steel wires.

[0018] The beneficial effects of this utility model are:

[0019] This single-drive backrest support four-way adjustment mechanism differs from the traditional structure with two drive units and screw transmission. It uses only one drive wheel to drive the first and second chains to move simultaneously, thereby controlling the tightening or loosening of four adjustment cables. This, in turn, pushes the backrest spring frame to provide support that conforms to the human body as needed. It has advantages such as good integrity, light weight, simple molding, low cost, large support area, uniform force distribution, and resistance to wear and loosening. It improves the comfort and reliability of the backrest, while greatly simplifying the drive system, reducing parts, and avoiding abnormal noise. The synchronous drive component, as a modular design, is more in line with the current trend of lightweight and cost-effective vehicles, improving the product's competitiveness. Moreover, the simple structure makes it easier to match with all vehicle models. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the single-drive backrest support four-way adjustment mechanism provided in this embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the synchronous drive component in the single-drive backrest support four-way adjustment mechanism provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the operation of the synchronous drive component in the single-drive backrest support four-way adjustment mechanism provided in this utility model embodiment.

[0023] In the attached image:

[0024] 1. Backrest spring frame; 11. Limiting buckle; 12. Vertical steel wire; 13. Horizontal steel wire;

[0025] 2. Synchronous drive assembly; 21. Base; 211. Limiting groove; 22. Drive wheel; 221. Tooth groove; 23. First chain; 231. Chain node; 232. Roller; 24. Second chain;

[0026] 3. Adjusting the pull line; 31. First pull line; 32. Second pull line; 33. Third pull line; 34. Fourth pull line. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.

[0032] Please see Figure 1 and Figure 2 As shown, this embodiment provides a single-drive backrest support four-way adjustment mechanism, including a backrest spring frame 1, a synchronous drive assembly 2, and an adjustment cable 3, wherein:

[0033] The backrest spring frame 1 is a flexible steel wire skeleton structure and is set between the seat skeleton and the seat foam layer. The upper left, upper right, lower left and lower right parts of the backrest spring frame 1 are respectively provided with limit buckles 11.

[0034] The synchronous drive assembly 2 includes a base 21, a drive wheel 22, a first chain 23 and a second chain 24. The base 21 is fixed on the backrest spring frame 1. The drive wheel 22 is rotatably mounted on the base 21. The first chain 23 and the second chain 24 pass around the drive wheel 22 and move synchronously with the rotation of the drive wheel 22.

[0035] There are at least four adjustment cables 3. The four adjustment cables 3 are fixedly connected to the four limit buckles 11 one by one. The first end of the four adjustment cables 3 is connected to the two ends of the first chain 23 and the two ends of the second chain 24 one by one. The second end of the four adjustment cables 3 is connected to the seat frame respectively.

[0036] Thus, by driving the first chain 23 and the second chain 24 simultaneously through a drive wheel 22, the four adjusting cables 3 are tightened or loosened, thereby pushing the backrest spring frame 1 to conform to the human body as needed to provide support. It has the advantages of good integrity, light weight, simple molding, low cost, large support area, uniform force distribution, and resistance to wear and loosening. It improves the comfort and reliability of the backrest, while greatly simplifying the drive system, reducing parts, and avoiding abnormal noise.

[0037] In at least one embodiment, the drive wheel 22 is provided with two layers of toothed rings, each with a plurality of toothed grooves 221, and the toothed grooves 221 of the two layers of toothed rings are axially aligned. The first chain 23 is engaged with one of the toothed rings for transmission, and the second chain 24 is engaged with the other toothed ring for transmission. The first chain 23 and the second chain 24 are respectively provided with a plurality of chain nodes 231 that are equidistantly distributed and engage with the toothed grooves 221.

[0038] Thus, the first chain 23 and the second chain 24 do not interfere with each other on the drive wheel 22 and are driven by the drive wheel 22 to move synchronously, thereby controlling the action of the four adjusting cables 3.

[0039] In this embodiment, the adjustment cable 3 located at the upper left of the backrest spring frame 1 is designated as the first cable 31, the cable located at the upper right of the backrest spring frame 1 is designated as the second cable 32, the cable located at the lower left of the backrest spring frame 1 is designated as the third cable 33, and the cable located at the lower right of the backrest spring frame 1 is designated as the fourth cable 34.

[0040] The first pull cable 31 is connected to the first end of the first chain 23, and the fourth pull cable 34 is connected to the second end of the first chain 23. When the first chain 23 moves with the drive wheel 22, the first pull cable 31 tightens and the fourth pull cable 34 loosens, and vice versa. The second pull cable 32 is connected to the first end of the second chain 24, and the third pull cable 33 is connected to the second end of the second chain 24. When the second chain 24 moves with the drive wheel 22, the second pull cable 32 tightens and the third pull cable 33 loosens, and vice versa.

[0041] In at least one embodiment, when the first chain 23 and the second chain 24 move synchronously with the rotation of the drive wheel 22 and the ends of the first chain 23 and the second chain 24 are about to disengage from their corresponding toothed rings, the chain nodes 231 at the ends remain engaged with the tooth grooves 221, so that the first chain 23 and the second chain 24 begin to move in opposite directions with the rotation of the drive wheel 22.

[0042] Given the characteristics of chain connections, taking the first chain 23 as an example, see... Figure 2 When the first chain 23 is engaged with the toothed ring at the upper half of the toothed ring (i.e., the lower surface of the first chain 23), and the drive wheel 22 rotates to push the first chain 23 to one end, the first chain 23 is about to disengage from the toothed ring. Then, as the drive wheel 22 continues to rotate, the toothed ring will engage with the upper surface of the first chain 23 again, driving the first chain 23 to the lower half of the toothed ring, thus causing the toothed ring to rotate and push the first chain 23 to the other end. Figure 3 As shown. By repeating this process, the drive wheel 22 rotates in a single direction, engages with different positions of the first chain 23, and pushes the first chain 23 to move in different directions.

[0043] In other embodiments, the drive wheel 22 can also be controlled to rotate in both directions, which can also push the first chain 23 and the second chain 24 to move back and forth, which will not be described in detail here.

[0044] Optionally, four limiting grooves 211 are provided on the base 21 and around the drive wheel 22, and four adjusting pull wires 3 are located in the four limiting grooves 211 respectively.

[0045] Therefore, by limiting the adjustment cable 3 through the limiting groove 211, the adjustment cable 3 can be accurately moved back and forth, thereby realizing the repeated pushing and returning actions of the corresponding position on the backrest spring frame 1.

[0046] Furthermore, the bottom plane of the limiting groove 211 where the two adjusting pull wires 3 connected to the first chain 23 are located is flush with the bottom surface of the toothed ring part of the corresponding layer; the bottom plane of the limiting groove 211 where the two adjusting pull wires 3 connected to the second chain 24 are located is flush with the bottom surface of the toothed ring part of the corresponding layer.

[0047] Optionally, the chain node 231 includes a hinge shaft and a roller 232 rotatably mounted on the hinge shaft, the roller 232 making rolling contact with the side wall of the limiting groove 211.

[0048] Thus, during the rotation of the drive wheel 22, the first chain 23 and the second chain 24 are connected to the corresponding adjustment cable 3 through the hinge shaft of the chain node 231 at the end, so that the adjustment cable 3 makes a crank-slider motion in the limiting groove 211. The motion trajectory is accurate, which can better balance the inertial force and reduce vibration, impact and friction.

[0049] Optionally, the drive wheel 22 is driven to rotate by a motor, and the base 21 has a motor mounting hole.

[0050] The synchronous drive component 2 here can be used as a separate module for matching and replacement. It is universal in the same type of four-way lumbar support mechanism. It can be matched with different models of seat frames simply by adjusting the upper and lower positions of the adjustment cable 3. As a result, the modular design is more in line with the current trend of lightweight and cost-effective vehicles, which improves the competitiveness of the product. Moreover, the simple structure makes it easier to match all models.

[0051] Optionally, the two adjusting cables 3 acting on the upper left and upper right of the backrest spring frame 1 are simultaneously tightened or loosened when the drive wheel 22 rotates; the two adjusting cables 3 acting on the lower left and lower right of the backrest spring frame 1 are simultaneously loosened or tightened when the drive wheel 22 rotates.

[0052] Furthermore, when the adjustment cable 3 is tightened, the corresponding part on the backrest spring frame 1 arches up to achieve the support and push-out function. The backrest spring frame 1 is in direct contact with the seat foam layer and has a pre-push-out amount.

[0053] Here, since the first chain 23 and the second chain 24 follow the rotation of the drive wheel 22 and are symmetrical non-rigid structures, when the drive wheel 22 presses... Figure 2 When the direction (counterclockwise) is rotated, the first pull cable 31 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the fourth pull cable 34 is relaxed; at the same time, the second pull cable 32 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the third pull cable 33 is relaxed; thus, the upper left and upper right parts of the backrest spring frame 1 retract, the upper part of the backrest spring frame 1 arches to achieve the ejection function, and the lower part of the backrest spring frame 1 relaxes and lies flat.

[0054] When the drive wheel 22 continues to rotate counterclockwise, after the first chain 23 moves around the drive wheel 22, the end node 231 of the first chain 23 will continue to move with the drive wheel 22, so the end node 231 becomes the beginning node 231. The first chain 23 will move in the opposite direction with the drive wheel 22. At this time, the fourth pull cable 34 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the first pull cable 31 is relaxed. At the same time, the second chain 24 will also move in the opposite direction synchronously, and the third pull cable 33 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the second pull cable 32 is relaxed. As a result, the lower left and lower right parts of the backrest spring frame 1 retract, the lower part of the backrest spring frame 1 arches to achieve the push-out function, and the upper part of the backrest spring frame 1 relaxes and is in a flat state.

[0055] Therefore, by relying solely on a single motor to provide continuous unidirectional rotation, the backrest spring frame 1 can achieve repeated pushing and returning movements at both the upper and lower positions.

[0056] In another implementation, the first chain 23 and the second chain 24 follow the rotation of the drive wheel 22, when the drive wheel 22 presses... Figure 2 When the direction (counterclockwise) is rotated, the first pull cable 31 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the fourth pull cable 34 is relaxed; at the same time, the second pull cable 32 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the third pull cable 33 is relaxed; thus, the upper left and upper right parts of the backrest spring frame 1 retract, the upper part of the backrest spring frame 1 arches to achieve the ejection function, and the lower part of the backrest spring frame 1 relaxes and lies flat.

[0057] Similarly, when the drive wheel 22 rotates in the opposite direction (clockwise), the fourth cable 34 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the first cable 31 relaxes; at the same time, the third cable 33 moves along the limiting groove 211 close to the drive wheel 22 to tighten, while the second cable 32 relaxes; thus, the lower left and lower right parts of the backrest spring frame 1 retract, the lower part of the backrest spring frame 1 arches to achieve the ejection function, and the upper part of the backrest spring frame 1 relaxes and lies flat.

[0058] Therefore, by relying on a motor to provide periodic forward and reverse rotation, the backrest spring frame 1 can repeatedly push out and return to its original position at both the upper and lower parts.

[0059] Optionally, the backrest spring frame 1 includes vertical steel wires 12 located on both sides and a plurality of transverse steel wires 13 connecting the vertical steel wires 12 on both sides, and the limiting buckle 11 is provided on the vertical steel wires 12.

[0060] Therefore, the adjusting cable 3 acts directly on the vertical steel wire 12, and the vertical steel wires 12 on both sides move closer or further apart, thereby arching or flattening the horizontal steel wire 13 and realizing the pushing out and restoring action of the backrest spring frame 1.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A single-drive backrest support four-way adjustment mechanism, characterized in that, It includes a backrest spring frame (1), a synchronous drive assembly (2), and an adjustment cable (3), wherein: The backrest spring frame (1) is a flexible steel wire skeleton structure and is set between the seat skeleton and the seat foam layer. The upper left, upper right, lower left and lower right parts of the backrest spring frame (1) are respectively provided with limit buckles (11). The synchronous drive assembly (2) includes a base (21), a drive wheel (22), a first chain (23), and a second chain (24). The base (21) is fixed on the backrest spring frame (1). The drive wheel (22) is rotatably mounted on the base (21). The first chain (23) and the second chain (24) pass around the drive wheel (22) and move synchronously with the rotation of the drive wheel (22). At least four adjustment cables (3) are provided. The four adjustment cables (3) are fixedly connected to the four limiting buckles (11) in a one-to-one correspondence. The first end of the four adjustment cables (3) is connected to the two ends of the first chain (23) and the two ends of the second chain (24) in a one-to-one correspondence. The second end of the four adjustment cables (3) is connected to the seat frame respectively.

2. The single-drive backrest support four-way adjustment mechanism according to claim 1, characterized in that, The drive wheel (22) is provided with two layers of gear rings, each gear ring having a plurality of tooth grooves (221), and the tooth grooves (221) of the two layers of gear rings are axially aligned. The first chain (23) engages with one of the gear rings for transmission, and the second chain (24) engages with the other gear ring for transmission. The first chain (23) and the second chain (24) are respectively provided with a plurality of chain nodes (231) that are equidistantly distributed and engage with the tooth grooves (221).

3. The single-drive backrest support four-way adjustment mechanism according to claim 2, characterized in that, When the first chain (23) and the second chain (24) move synchronously with the rotation of the drive wheel (22) and the ends of the first chain (23) and the second chain (24) are about to disengage from the corresponding toothed rings, the chain nodes (231) at the ends remain engaged with the tooth grooves (221), so that the first chain (23) and the second chain (24) begin to move in opposite directions with the rotation of the drive wheel (22).

4. The single-drive backrest support four-way adjustment mechanism according to claim 2, characterized in that, Four limiting grooves (211) are provided on the base (21) and around the drive wheel (22), and the four adjusting pull wires (3) are located in the four limiting grooves (211) respectively.

5. The single-drive backrest support four-way adjustment mechanism according to claim 4, characterized in that, The bottom plane of the limiting groove (211) where the two adjusting pull wires (3) connected to the first chain (23) are located is flush with the bottom surface of the toothed ring part of the corresponding layer; the bottom plane of the limiting groove (211) where the two adjusting pull wires (3) connected to the second chain (24) are located is flush with the bottom surface of the toothed ring part of the corresponding layer.

6. The single-drive backrest support four-way adjustment mechanism according to claim 4, characterized in that, The chain node (231) includes a hinge shaft and a roller (232) rotatably mounted on the hinge shaft. The roller (232) makes rolling contact with the side wall of the limiting groove (211).

7. The single-drive backrest support four-way adjustment mechanism according to claim 1, characterized in that, The drive wheel (22) is driven to rotate by a motor, and the base (21) has a motor mounting hole.

8. The single-drive backrest support four-way adjustment mechanism according to claim 1, characterized in that, The two adjustment cables (3) acting on the upper left and upper right parts of the backrest spring frame (1) are simultaneously tightened or loosened when the drive wheel (22) rotates; the two adjustment cables (3) acting on the lower left and lower right parts of the backrest spring frame (1) are simultaneously loosened or tightened when the drive wheel (22) rotates.

9. The single-drive backrest support four-way adjustment mechanism according to claim 8, characterized in that, When the adjustment cable (3) is tightened, the corresponding part on the backrest spring frame (1) arches up to achieve the support and push-out function. The backrest spring frame (1) is in direct contact with the seat foam layer and has a pre-push-out amount.

10. The single-drive backrest support four-way adjustment mechanism according to claim 1, characterized in that, The backrest spring frame (1) includes vertical steel wires (12) located on both sides and several transverse steel wires (13) connecting the vertical steel wires (12) on both sides, and the limiting buckle (11) is disposed on the vertical steel wires (12).

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