Seat lumbar support

Abstract

This invention discloses a lumbar support for a seat, including a backrest. A base and a support plate located at the front of the base are installed within the backrest. A push arm is provided between the base and the support plate, arranged vertically between them. The upper end of the push arm is rotatably connected to the base, and the lower end abuts against the rear side of the support plate. A second drive mechanism is installed on the base, which drives the push arm to rotate around its rotation center. When the push arm rotates, its lower end can push the support plate forward relative to the base. The advantages of this invention are: by controlling the rotation angle of the push arm, the lumbar support can be adjusted forward and backward; and the longitudinal layout of the push arm does not excessively occupy the internal space of the backrest, ensuring the compactness of the overall backrest structure.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more specifically to a lumbar support for a seat. Background Technology

[0002] Car seats are an important component that provides support and safety protection for passengers inside a car. With increasingly fierce competition in the automotive market, seat comfort has become an important indicator for evaluating the quality of car seats and the entire vehicle.

[0003] The lumbar support of the seat back is an important component of car seats that provides lumbar support. It can provide auxiliary support for the occupant's lower back and relieve back pain, fatigue and discomfort caused by long-term driving or sitting.

[0004] However, in traditional technology, the lumbar support structure inside the backrest is complex, especially the lumbar support with four-way adjustment (forward, backward, up, and down). Its thickness is large, which will occupy a lot of the front and back space inside the backrest frame, making the seat bulky and requiring optimization and upgrading in terms of compactness. Summary of the Invention

[0005] In view of this, the present invention provides a lumbar support for a seat, which can provide support for the user's waist and has the advantage of high compactness.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A type of lumbar support for a seat, the key features of which are: a backrest, a base and a support plate located in front of the base are installed inside the backrest, and a push arm is provided between the base and the support plate, the push arm being arranged vertically between the base and the support plate;

[0008] The upper end of the push arm is rotatably connected to the base, and the lower end abuts against the rear side of the pallet. A second drive mechanism is installed on the base, which is used to drive the push arm to rotate around its rotation center. When the push arm rotates, its lower end can push the pallet to move forward relative to the base.

[0009] With the above structure, when the second drive mechanism drives the push arm to rotate away from the base, its lower end can push the pallet forward relative to the base so that the pallet can be pressed against the user's waist area to provide auxiliary support for the occupant's waist.

[0010] Preferably, the tray is a flexible plastic plate, with its upper end fixedly connected to the substrate.

[0011] Preferably, the base includes a mounting base plate assembled inside the backrest and a support plate slidably connected to the mounting base plate. The support plate is slidably mounted along the height direction of the mounting base plate. The push arm, the second drive mechanism, and the support plate are disposed on the support plate. The mounting base plate is provided with a third drive mechanism for driving the support plate to slide along the height direction of the mounting base plate.

[0012] Preferably, the third drive mechanism includes a linear drive unit disposed at one end of the mounting base plate in the width direction and a guide component disposed at the other end. The linear drive unit is used to drive the support plate to move up and down, and the guide component is used to guide and support the support plate to move up and down.

[0013] Preferably, the second driving mechanism includes a slider slidably mounted on the base and a thrust assembly for controlling the sliding of the slider. The push arm and the slider are connected by a connecting rod, and the two ends of the connecting rod are respectively hinged to the push arm and the slider. When the slider slides, it can drive the push arm to rotate via the connecting rod.

[0014] Preferably, the thrust-stop assembly includes a limiting block that abuts against the slider and a driving component that drives the limiting block to move along the sliding direction of the slider. An elastic element is provided between the base and the slider, and the elastic element applies a force to make the slider abut against the limiting block. When the push arm is pressed by an external force, the slider can overcome the resistance of the elastic element and slide, so that the push arm moves toward the base.

[0015] Preferably, the elastic element is a compression spring, which abuts against the end of the slider and the base. When the limiting block moves toward the compression spring, it can force the compression spring to store force through the slider. When the limiting block moves away from the slider, it can release the elastic potential energy of the compression spring. The thrust generated by the compression spring can make the slider move synchronously with the limiting block.

[0016] Preferably, a guide rod extending along the height direction is fixed on the base, and the compression spring, slider and limiting block are sequentially mounted on the guide rod along the height direction, and the slider and limiting block can slide up and down relative to the guide rod.

[0017] Preferably, the base is provided with a rotating shaft and a first driving mechanism for driving the rotating shaft to rotate. Two sets of push arms are connected to the rotating shaft. A support part is installed at the end of each set of push arms away from the rotating shaft. Two annular grooves are symmetrically provided on the rotating shaft. The upper end of the push arm is rotatably fitted onto the corresponding annular groove. The two side walls of each annular groove are inclined relative to the center line of the rotating shaft. The two sides of the push arm near the rotating shaft are in sliding contact with the two side walls of the corresponding annular groove.

[0018] When the pallet is in its lowest position, the first drive mechanism drives the rotating shaft to rotate. Under the transmission of the inclined sidewall of the annular groove and the constraint of the connecting rod, the push arm is forced to swing back and forth along the axis of the rotating shaft. The pallet has an opening in the middle, and the width of the opening is adapted to the minimum distance between the two push arm support parts.

[0019] Preferably, the rotating shaft includes a central shaft and a sleeve fixedly sleeved on the central shaft, the annular groove is formed on the sleeve, and one end of the push arm has an annular sleeve hole adapted to the annular groove, which is rotatably fitted onto the annular groove.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The lumbar support provided by this invention can achieve the front and rear adjustment function of the lumbar support by controlling the rotation angle of the push arm. Moreover, the push arm adopts a longitudinal layout, which will not take up too much space inside the backrest and ensures the compactness of the overall structure of the backrest.

[0022] 2. The lumbar support provided by this invention not only enables four-way adjustment of the lumbar support (front, back, up, and down), but also has a massage function of fixed-point kneading and walking kneading, thus realizing the multi-functionality of the seat and improving the user's riding experience and comfort.

[0023] 3. The seat lumbar support provided by this invention can achieve recoverable collapse of the push arm and support part when the vehicle is in collision or other emergencies while the lumbar support or massage function is in use, thus ensuring the safety of massage and lumbar support use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the lumbar support structure of a seat;

[0025] Figure 2 This is a structural diagram of the seat lumbar support in its unused state (backrest A is hidden);

[0026] Figure 3 A cross-sectional view of the seat lumbar support in use;

[0027] Figure 4 A front view showing the internal structure of the seat lumbar support;

[0028] Figure 5 This is a structural diagram of the seat lumbar support in use.

[0029] Figure 6 This is a schematic diagram of the structure of the rotating shaft B1;

[0030] Figure 7 This is an exploded view of sleeve B13 and push arm B2;

[0031] Figure 8 This is a partial sectional view of the rotating shaft B1;

[0032] Figure 9 A cross-sectional view of the lumbar support of the seat in its unused state;

[0033] Figure 10 A cross-sectional view of the seat lumbar support in use;

[0034] Figure 11 A schematic diagram illustrating the positional relationship between slider D4 and the thrust assembly;

[0035] Figure 12 This is another structural diagram of the seat lumbar support (backrest A and support plate B5 are hidden);

[0036] Figure 13 This is a schematic diagram of the support plate 2. Detailed Implementation

[0037] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0038] like Figures 1 to 3 As shown, a seat lumbar support includes a backrest A, within which a base B and a support plate B5 located in front of the base B are installed. In use, the support plate B5 corresponds to the user's lumbar region. A push arm B2 is provided between the base B and the support plate B5, arranged vertically between them. Specifically, the upper end of the push arm B2 is rotatably connected to the base B, and the lower end abuts against the rear side of the support plate B5. Figure 4 As can be seen, a second drive mechanism D is installed on the base B. This second drive mechanism D can drive the push arm B2 to rotate around its rotation center, that is, drive the push arm B2 to rotate towards or away from the base B. When the push arm B2 rotates away from the base B, its lower end can push the support plate B5 forward relative to the base B, so that the support plate B5 can rest against the user's lumbar region, providing auxiliary support for the occupant's lower back. The advantage of this design is that by controlling the rotation angle of the push arm B2, the forward and backward adjustment function of the lumbar support can be achieved. Furthermore, the push arm B2 adopts a longitudinal layout, which does not occupy too much space inside the backrest A, ensuring the compactness of the overall structure of the backrest A.

[0039] Furthermore, for example Figure 3 As shown, in this embodiment, the tray B5 is a flexible plastic plate, and its upper end is fixedly connected to the base B. When the push arm B2 applies a forward pushing force to the tray B5, it can cause the tray B5 to deform and act as a support for the user's waist. When the push arm B2 moves towards the base B, the tray B5 can return to its original state.

[0040] Please refer to Figure 2 and 4The base B includes a mounting base plate 1 assembled inside the backrest A, and a support plate 2 slidably connected to the mounting base plate 1. The support plate 2 slides along the height direction of the mounting base plate 1. A push arm B2 and a second drive mechanism D are mounted on the support plate 2, and the upper end of the support plate B5 is fixedly connected to the support plate 2. A third drive mechanism E is provided on the mounting base plate 1. The third drive mechanism E can drive the support plate 2 to slide along the height direction of the mounting base plate 1, that is, it can drive the support plate B5 to move up and down along the user's waist and back, realizing the up and down adjustment function of the lumbar support. Combined with the front and back adjustment function realized by the push arm B2, the lumbar support has a four-way adjustment function of front, back, up and down to adapt to the personalized adjustment needs of users with different body types.

[0041] Revisit Figure 4 The third drive mechanism E includes a linear drive unit E1 located at one end of the mounting base plate 1 in the width direction, and a guide component E2 located at the other end. The linear drive unit E1 drives the support plate 2 to move up and down, and the guide component E2 guides the support plate 2 to move up and down, making the lifting and lowering of the support plate 2 on the mounting base plate 1 smoother. This design, by arranging the push arm B2 and the second drive mechanism D in the middle of the support plate 2, and placing the linear drive unit E1 and the guide component E2 at both ends, has the advantages of reliable structure, compactness, and small space occupation, which helps to make the product thinner.

[0042] Furthermore, for example Figure 4 As shown, the linear drive unit E1 includes a first lead screw E11 extending along the height direction of the mounting base plate 1, a nut sleeve E12 fitted onto the first lead screw E11, and a first motor E13 driving the nut sleeve E12 to rotate. The first lead screw E11 is located at the left end of the mounting base plate 1. Figure 12 As can be seen, both ends of the first lead screw E11 are fixedly supported on the mounting base plate 1 by support seats E3. The first motor E13 is fixedly mounted on the support plate 2. The first motor E13 drives the nut sleeve E12 to rotate, which in turn drives the nut sleeve E12 to move helically up and down along the axis of the first lead screw E11, thereby driving the first motor E13 and the support plate 2 as a whole to move up and down. Since the first lead screw E11 is offset, the support plate 2 is prone to swaying gaps. Therefore, the guide component E2 at the right end can absorb the swaying gaps of the support plate 2, ensuring the smoothness of the lifting and lowering movement of the support plate 2. At the same time, by fixing the first lead screw E11, more stable support can be provided for the support plate 2.

[0043] like Figure 5As shown, the guide assembly E2 includes a guide rail E21 fixed to the right end of the mounting base plate 1. The guide rail E21 extends along the height direction of the mounting base plate 1. As shown in Figure 13, a second roller E22 is provided at the bottom of the support plate 2 corresponding to the position of the guide rail E21. The second roller E22 slides in contact with the bottom of the guide rail E21. This design improves the smoothness of the sliding of the support plate 2 and also has the advantage of low cost. In this embodiment, multiple sets of third rollers 21 are rotatably provided at the bottom of the support plate 2, which slide in contact with the mounting base plate 1. The third rollers 21 can further improve the smoothness of the sliding of the support plate 2.

[0044] Please refer to Figure 3 The second driving mechanism D includes a slider D4 slidably mounted on the base B and a thrust assembly for controlling the sliding of the slider D4. The push arm B2 and the slider D4 are connected by a connecting rod D5, with both ends of the connecting rod D5 hinged to the push arm B2 and the slider D4 respectively. When the slider D4 slides, it can drive the push arm B2 to rotate around its rotation center via the connecting rod D5. When the thrust assembly drives the slider D4 to slide upwards, it can drive the push arm B2 to rotate outwards synchronously via the connecting rod D5. When the thrust assembly drives the slider D4 to slide downwards, it can drive the push arm B2 to rotate inwards synchronously under the linkage of the connecting rod D5, so that the push arm B2 retracts towards the support plate 2.

[0045] Revisit Figure 9 and 10 The thrust assembly includes a limiting block D2 that abuts against the slider D4, and a driving component D3 that drives the limiting block D2 to move along the sliding direction of the slider D4. An elastic element D1 is provided between the support plate 2 and the slider D4, and the elastic element D1 applies a force to make the slider D4 abut against the limiting block D2. When the push arm B2 is pressed by an external force, the slider D4 can overcome the resistance of the elastic element D1 and slide, so that the push arm B2 rotates towards the support plate 2. When the user uses the lumbar support's forward and backward adjustment function, the drive component D3 drives the limiting block D2 to move away from the slider D4. During this process, because the elastic element D1 applies a force that keeps the slider D4 against the limiting block D2, the slider D4 can move synchronously with the limiting block D2. Thus, under the linkage of the connecting rod D5, it can drive the push arm B2 to rotate outward around its rotation center, so that the lower end of the push arm B2 can push the support plate B5 forward. The drive component D3 drives the limiting block D2 to move closer to the slider D4. At this time, the limiting block D2 pushes the slider D4 to slide against the resistance of the elastic element D1. Thus, under the linkage of the connecting rod D5, it can drive the push arm B2 to rotate inward, and the support plate B5 can return to its original state.

[0046] With this structural design, the lumbar support also features a passive collapse function during use. Specifically, when the push arm B2 pushes the support plate B5 forward, in the event of a collision or other emergency, the push arm B2 is compressed by external force. The slider D4 overcomes the resistance of the elastic element D1 and slides, and under the linkage of the connecting rod D5, it drives the push arm B2 to quickly retract towards the support plate 2. Simultaneously, the support plate B5 returns to its original flat state, effectively preventing injury to the lumbar support and improving its safety. When the external force disappears, the elastic element D1 resets, pushing the slider D4 to slide, which in turn causes the push arm B2 to automatically return to its working position. This design protects the support plate B5 and push arm B2 from damage, saves costs, eliminates the hassle of replacing parts, and offers significant practical advantages.

[0047] The elastic element D1 can be a compression spring, tension spring, torsion spring, leaf spring, sheet spring, etc. In this embodiment, the elastic element D1 is a compression spring. (Reference) Figure 9 and 10 The compression spring rests between the slider D4 and the lower end of the support plate 2. The limiting block D2 moves downward along the height direction of the support plate 2, that is, towards the compression spring. This pushes the slider D4 downward to compress the compression spring, forcing it to store force. The downward movement of the slider D4 can drive the push arm B2 to rotate towards the support plate 2 via the connecting rod D5. When the limiting block D2 moves away from the slider D4, that is, upward, it releases the elastic potential energy of the compression spring. The thrust generated by the compression spring can cause the slider D4 to move synchronously with the limiting block D2, thereby driving the push arm B2 to rotate outward via the connecting rod D5.

[0048] Furthermore, such as Figure 9 As shown, a guide rod D6 extending along its height is fixed on the support plate 2. A compression spring, a slider D4, and a limiting block D2 are sequentially fitted onto the guide rod D6 from bottom to top, and the slider D4 and the limiting block D2 can slide up and down relative to the guide rod D6. This design ensures the reliability of the installation and movement of the elastic element D1, the slider D4, and the limiting block D2.

[0049] like Figure 4 and 5 As shown, a rotating shaft B1 and a first driving mechanism C for driving the rotating shaft B1 are rotatably mounted on the support plate 2. Two sets of push arms B2 are connected to the rotating shaft B1, and a support portion B3 is installed at the end of each push arm B2 away from the rotating shaft B1. (Combined with...) Figure 6 and Figure 8 As shown, the rotating shaft B1 has two sets of annular grooves B11 symmetrically arranged, and the upper ends of the two sets of push arms B2 are respectively rotatably fitted onto the two annular grooves B11. Figure 8It can be seen that the two side walls of each annular groove B11 are inclined relative to the center line of the rotating shaft B1, that is, the center line of the annular groove B11 and the center line of the rotating shaft B1 form an angle r. The two sides of the push arm B2 near the rotating shaft B1 respectively slide in contact with the two side walls of the annular groove B11. When the support plate B5 is in the lowest position of the initial state, the first drive mechanism C drives the rotating shaft B1 to rotate. Under the transmission of the inclined side wall of the annular groove B11 and the constraint of the connecting rod D5, the push arm B2 is forced to swing back and forth along the axial direction of the rotating shaft B1, so that the two support parts B3 can move closer and further away from each other. In this embodiment, one end of the connecting rod D5 is hinged to the middle of the push arm B2, and the connecting rod D5 and the push arm B2 are connected by a ball joint. Figure 2 As shown, the pallet B5 has an opening B51 in the middle, and the width of the opening B51 is adapted to the minimum distance between the support parts B3 of the two push arms B2.

[0050] The advantage of this design is that, in addition to providing lumbar support, the device also massages the user's back. Specifically, when using the lumbar support, the first drive mechanism C drives the rotating shaft B1 to rotate, transmitting power to the push arm B2. Under the constraint of the connecting rod D5, the inclined sidewall of the annular groove B11 and the sidewall of the push arm B2 form an inclined cam transmission. Therefore, the rotation of the rotating shaft B1 forces the push arm B2 to swing back and forth along the axis of the rotating shaft B1, that is, the push arm B2 can swing left and right, thereby driving the support part B3 to swing left and right. Since the two annular grooves B11 are symmetrically arranged, the swing trajectories of the two support parts B3 are also symmetrical, that is, the two support parts B3 can move closer and further away from each other. After increasing the distance between the two support parts B3, the second drive mechanism D drives the two sets of push arms B2 to rotate outward, so that the two support parts B3 push the support plate B5 forward. Two symmetrically distributed support parts B3 push the support plate B5 to deform and form a lumbar support. The two support parts B3 can support the left and right ends of the user's waist. The middle part of the support plate B5 can form an inward concave structure under the pressure of the user's waist, thereby improving the comfort of the lumbar support.

[0051] When using the massage function, the first drive mechanism C drives the rotating shaft B1 to rotate at a certain angle to minimize the distance between the two support parts B3. The second drive mechanism D drives the two sets of push arms B2 to rotate outward, causing the two support parts B3 to pass forward through the opening B51. Subsequently, the first drive mechanism C drives the rotating shaft B1 to rotate, transmitting power to the push arms B2. The two support parts B3 can then perform a reciprocating kneading massage on the user's lower back. Combined with the third drive mechanism E driving the support plate 2 to slide along the height of the mounting base 1, the two support parts B3 can move up and down along the meridians on both sides of the user's spine, thus simulating a walking kneading massage function, enhancing the massage effect and enriching the seat's functionality. After the massage, the first drive mechanism C drives the rotating shaft B1 to rotate at a certain angle to minimize the distance between the two support parts B3. The second drive mechanism D drives the push arms B2 to rotate inward, and the two support parts B3 retract back onto the support plate 2 through the opening B51.

[0052] like Figure 4 and 6 As shown, the rotating shaft B1 includes a central shaft B12 and a sleeve B13 fixedly sleeved on the central shaft B12. An annular groove B11 is formed on the sleeve B13. The annular groove B11 has two inner sidewalls a distributed to the left and right, and the center lines of the two inner sidewalls a are inclined relative to the center line of the rotating shaft B1. Furthermore... Figure 7 The push arm B2 has an annular sleeve B21 at one end that is adapted to the annular groove B11. The annular sleeve B21 is rotatably fitted onto the annular groove B11. Specifically, the annular sleeve B21 has outer walls b on both the left and right sides. The two outer walls b respectively cooperate with the two inner walls a, and the two outer walls b respectively slide in contact with the two inner walls a. The first drive mechanism C directly drives the central shaft B12 to rotate, which can drive the sleeve B13 to rotate. The sleeve B13 rotates continuously, and the rotational movement of the two inner walls a of the annular groove B11 can force the annular sleeve B21 to swing back and forth along the central shaft B12, thereby causing the support part B3 at the far end of the push arm B2 to swing left and right.

[0053] refer to Figure 7 To facilitate the assembly of the annular sleeve hole B21, a circular protrusion c is detachably installed at one end of the sleeve B13. An outwardly protruding annular boss d is provided on the surface of the sleeve B13 near the circular protrusion c. The space enclosed by the inner wall of the circular protrusion c and the circumferential surface of the sleeve B13 forms an annular groove B11.

[0054] Please refer to Figure 5 and 11There are two sets of guide rods D6, which are symmetrically arranged along the width of the support plate 2. One set of guide rods D6 corresponds to one set of push arms B2. There are also two sets of compression springs and connecting rods D5. The two sets of compression springs are respectively fitted on the two guide rods D6. The two ends of the limiting block D2 and the two ends of the slider D4 are slidably connected to the two guide rods D6 respectively. The two connecting rods D5 are symmetrically arranged on the sides of the two sets of push arms B2.

[0055] Revisit Figure 11 The driving component D3 includes a second motor D31 fixed on the support plate 2 and a second lead screw D32 driven by the second motor D31. The second lead screw D32 extends along the height direction of the support plate 2. A limiting block D2 is threaded onto the second lead screw D32. The second motor D31 drives the second lead screw D32 to rotate, which in turn drives the limiting block D2 to move along the second lead screw D32. To ensure the compactness of the overall structure and the uniformity of the force on the slider D4, the second lead screw D32 is located between two sets of guide rods D6. Both ends of the limiting block D2 and both ends of the slider D4 are slidably connected to the two guide rods D6, respectively. The second motor D31 drives the limiting block D2 to move downward, which can drive the slider D4 to simultaneously compress the two sets of compression springs, thereby driving the two sets of push arms B2 to retract inward, ensuring the synchronicity of the movement of the two sets of push arms B2.

[0056] Depend on Figure 11 As can be seen, a mounting base D7 is fixedly mounted on the lower end of the support plate 2, and the ends of the two guide rods D6 are fixedly connected to both ends of the mounting base D7 in the width direction. The lower end of the second lead screw D32 is rotatably supported in the middle of the mounting base D7. This design ensures the reliability of the installation.

[0057] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A lumbar support for a seat, characterized in that: Includes a backrest (A), in which a base (B) and a support plate (B5) located in front of the base (B) are installed. A push arm (B2) is provided between the base (B) and the support plate (B5), and the push arm (B2) is arranged vertically between the base (B) and the support plate (B5). The upper end of the push arm (B2) is rotatably connected to the base (B), and the lower end abuts against the rear side of the pallet (B5). A second drive mechanism (D) is installed on the base (B), which is used to drive the push arm (B2) to rotate around its rotation center. When the push arm (B2) rotates, its lower end can push the pallet (B5) forward relative to the base (B). The second drive mechanism (D) includes a slider (D4) slidably mounted on the base (B) and a thrust assembly for controlling the sliding of the slider (D4). The thrust assembly includes a limiting block (D2) abutting against the slider (D4) and a drive component (D3) for driving the limiting block (D2) to move along the sliding direction of the slider (D4). An elastic element (D1) is provided between the base (B) and the slider (D4), and the elastic element (D1) applies a force to cause the slider (D4) to abut against the limiting block (D2).

2. The lumbar support for a seat according to claim 1, characterized in that: The tray (B5) is a flexible plastic plate, and its upper end is fixedly connected to the base (B).

3. The lumbar support for a seat according to claim 1, characterized in that: The base (B) includes a mounting base plate (1) assembled inside the backrest (A) and a support plate (2) slidably connected to the mounting base plate (1). The support plate (2) is slidably installed along the height direction of the mounting base plate (1). The push arm (B2), the second drive mechanism (D) and the support plate (B5) are arranged on the support plate (2). The mounting base plate (1) is provided with a third drive mechanism (E), which is used to drive the support plate (2) to slide along the height direction of the mounting base plate (1).

4. The lumbar support for a seat according to claim 3, characterized in that: The third drive mechanism (E) includes a linear drive unit (E1) disposed at one end of the width direction of the mounting base plate (1) and a guide component (E2) disposed at the other end. The linear drive unit (E1) is used to drive the support plate (2) to move up and down, and the guide component (E2) is used to guide and support the support plate (2) to move up and down.

5. The lumbar support for a seat according to claim 1, characterized in that: The push arm (B2) and the slider (D4) are connected by a connecting rod (D5). The two ends of the connecting rod (D5) are hinged to the push arm (B2) and the slider (D4) respectively. The slider (D4) slides and can drive the push arm (B2) to rotate via the connecting rod (D5).

6. The lumbar support for a seat according to claim 5, characterized in that: When the push arm (B2) is pressed by an external force, the slider (D4) can overcome the resistance of the elastic element (D1) to slide, so that the push arm (B2) moves toward the base (B).

7. The lumbar support for a seat according to claim 6, characterized in that: The elastic element (D1) is a compression spring, which abuts against the slider (D4) and the end of the base (B). The limiting block (D2) moves toward the compression spring, which can force the compression spring to store force through the slider (D4). The limiting block (D2) moves away from the slider (D4), which can release the elastic potential energy of the compression spring. The thrust generated by the compression spring can make the slider (D4) move synchronously with the limiting block (D2).

8. The lumbar support for a seat according to claim 7, characterized in that: A guide rod (D6) extending along its height direction is fixed on the base (B). The compression spring, slider (D4) and limiting block (D2) are sequentially mounted on the guide rod (D6) along the height direction, and the slider (D4) and limiting block (D2) can slide up and down relative to the guide rod (D6).

9. The lumbar support for a seat according to claim 5, characterized in that: The base (B) is provided with a rotating shaft (B1) and a first driving mechanism (C) for driving the rotating shaft (B1) to rotate. Two sets of push arms (B2) are connected to the rotating shaft (B1). A support part (B3) is installed at the end of each set of push arms (B2) away from the rotating shaft (B1). Two annular grooves (B11) are symmetrically provided on the rotating shaft (B1). The upper end of the push arm (B2) is rotatably fitted onto the corresponding annular groove (B11). The two side walls of each annular groove (B11) are inclined relative to the center line of the rotating shaft (B1). The two sides of the push arm (B2) near the rotating shaft (B1) are in sliding contact with the two side walls of the corresponding annular groove (B11). When the pallet (B5) is in its lowest position, the first drive mechanism (C) drives the rotating shaft (B1) to rotate. Under the transmission of the inclined side wall of the annular groove (B11) and the constraint of the connecting rod (D5), the push arm (B2) is forced to swing back and forth along the axial direction of the rotating shaft (B1). The pallet (B5) has an opening (B51) in the middle, and the width of the opening (B51) is adapted to the minimum distance between the support parts (B3) of the two push arms (B2).

10. The lumbar support for a seat according to claim 9, characterized in that: The rotating shaft (B1) includes a central shaft (B12) and a sleeve (B13) fixedly sleeved on the central shaft (B12). The annular groove (B11) is formed on the sleeve (B13). One end of the push arm (B2) has an annular sleeve hole (B21) adapted to the annular groove (B11). The annular sleeve hole (B21) is rotatably fitted on the annular groove (B11).

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