Waist support of automobile seat

Abstract

The utility model discloses an automobile seat waist support which comprises a backrest, a base body and a supporting plate located on the front side of the base body are installed in the backrest, a push arm is arranged between the base body and the supporting plate, and the push arm is arranged between the base body and the supporting plate in the vertical direction. The upper end of the pushing arm is rotationally connected with the base body, the lower end of the pushing arm abuts against the rear side of the supporting plate, and a second driving mechanism is installed on the base body and used for driving the pushing arm to rotate around the rotating center of the pushing arm; the lower end of the push arm can push the supporting plate to move forwards relative to the base body. The backrest has the advantages that the front-back adjusting function of the waist support can be achieved by controlling the rotating angle of the push arm, the push arm is longitudinally arranged, the inner space of the backrest cannot be excessively occupied, and the compactness of the overall structure of the backrest is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle seats, and particularly relates to a lumbar support for a vehicle seat. Background Art

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

[0003] The lumbar support of the seat back is an important component on the vehicle seat that provides lumbar support, and can provide auxiliary support for the occupant's lumbar and back, alleviating the soreness, fatigue and discomfort of the occupant caused by long-term driving or riding.

[0004] However, in the traditional technology, the lumbar support structure inside the backrest is complex. Especially for the lumbar support with four-way adjustment in the front, back, up and down directions, its thickness dimension is large, which will occupy a large amount of front and back space inside the backrest frame, resulting in a bulky seat and the compactness urgently needs to be optimized and upgraded. Summary of the Utility Model

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

[0006] To achieve the above object, the technical solution of the utility model is as follows:

[0007] A lumbar support for a vehicle seat, which is characterized in that: it includes a backrest, a base body is installed inside the backrest, and a support plate is arranged in front of the base body. A push arm is arranged between the base body and the support plate, and the push arm is arranged vertically between the base body and the support plate;

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

[0009] With the above structure, when the second driving mechanism drives the push arm to rotate away from the base body, its lower end can push the support plate to move forward relative to the base body, so that the support plate can be pushed forward to abut against the user's waist area, providing auxiliary support for the occupant's waist.

[0010] Preferably: the support plate is a flexible plastic plate, and its upper end is fixedly connected to the base body.

[0011] Preferably, the base body 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 driving mechanism, and the support plate are arranged on the support plate. A third driving mechanism is provided on the mounting base plate, and the third driving mechanism is used to drive the support plate to slide along the height direction of the mounting base plate.

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

[0013] Preferably, the second driving mechanism includes a slider slidably mounted on the base body and a thrust component for controlling the sliding of the slider. The push arm is connected to the slider through a connecting rod. 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 through the connecting rod.

[0014] Preferably, the thrust component includes a limiting block in contact with the slider and a driving component for driving the limiting block to move along the sliding direction of the slider. An elastic element is provided between the base body 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 towards the base body.

[0015] Preferably, the elastic element is a compression spring. The compression spring abuts between the slider and the end of the base body. When the limiting block moves towards the compression spring, it can force the compression spring to store energy 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 of the base body is fixedly provided on the base body. The compression spring, the slider, and the limiting block are sleeved on the guide rod in sequence along the height direction, and the slider and the limiting block can slide up and down relative to the guide rod.

[0017] Preferably, a rotating shaft and a first driving mechanism for driving the rotating shaft to rotate are provided on the base body. Two groups of push arms are connected to the rotating shaft. Support parts are installed at the ends of the two groups of push arms away from the rotating shaft. Two annular grooves are symmetrically provided on the rotating shaft. The upper ends of the push arms are rotatably sleeved on the corresponding annular grooves. 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 respectively in sliding contact with the two side walls of the corresponding annular groove.

[0018] When the pallet is in the lowest position, the first driving mechanism drives the rotating shaft to rotate. Under the transmission of the inclined side wall of the annular groove and the constraint of the connecting rod, the push arm can be forced to swing back and forth along the axial direction of the rotating shaft. An opening is provided in the middle of the pallet, and the width of the opening is adapted to the minimum distance between the two support parts of the push arm.

[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. One end of the push arm has an annular sleeve hole adapted to the annular groove, and the annular sleeve hole is rotatably sleeved on the annular groove.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1. By using the lumbar support for automotive seats provided by the present utility model, the front-back adjustment function of the lumbar support can be realized by controlling the rotation angle of the push arm. Moreover, the push arm is longitudinally arranged, which will not occupy too much space inside the backrest, ensuring the compactness of the overall structure of the backrest.

[0022] 2. By using the lumbar support for automotive seats provided by the present utility model, not only the four-way adjustment function of the lumbar support in the front-back, up and down directions can be realized, but also the massage functions of fixed-point kneading and walking kneading are available, thus realizing the multi-functionality of the seat and improving the user's riding experience and comfort.

[0023] 3. By using the lumbar support for automotive seats provided by the present utility model, in the use state of the lumbar support or the massage function, when the vehicle collides or other emergencies occur, the recoverable collapse of the push arm and the support part can be realized, ensuring the safety of the use of the massage and the lumbar support. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the lumbar support for automotive seats;

[0025] Figure 2 It is a schematic structural diagram of the lumbar support for automotive seats in the unused state (the backrest A has been hidden);

[0026] Figure 3 It is a cross-sectional view of the lumbar support for automotive seats in the use state;

[0027] Figure 4 It is a front view showing the internal structure of the lumbar support for automotive seats;

[0028] Figure 5 It is a schematic structural diagram of the lumbar support for automotive seats in the use state;

[0029] Figure 6 It is a schematic structural diagram of the rotating shaft B1;

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

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

[0032] Figure 9 It is a cross-sectional view of the lumbar support of a vehicle seat in an unused state;

[0033] Figure 10 It is a cross-sectional view of the lumbar support of a vehicle seat in a used state;

[0034] Figure 11 It is a schematic diagram showing the positional relationship between the slider D4 and the thrust component;

[0035] Figure 12 It is another schematic diagram of the lumbar support of a vehicle seat (the backrest A and the support plate B5 are hidden);

[0036] Figure 13 It is a schematic diagram of the structure of the support plate 2. Specific embodiments

[0037] The following further describes the present invention in conjunction with the embodiments and the drawings.

[0038] As Figures 1 to 3 shown, a lumbar support for a vehicle seat includes a backrest A, in which a base body B and a support plate B5 located in front of the base body B are installed. During application, the support plate B5 corresponds to the position of the user's waist. A push arm B2 is provided between the base body B and the support plate B5, and the push arm B2 is arranged vertically between the base body B and the support plate B5. Specifically, the upper end of the push arm B2 is rotatably connected to the base body B, and the lower end abuts against the rear side of the support plate B5. It can be seen from Figure 4 that a second driving mechanism D is installed on the base body B, and the second driving 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 body B. When the push arm B2 rotates away from the base body B, its lower end can push the support plate B5 to move forward relative to the base body B, so that the support plate B5 can be pushed forward against the user's waist area to provide auxiliary support for the occupant's waist. The advantage of such a design is that by controlling the rotation angle of the push arm B2, the front-back adjustment function of the lumbar support can be realized, and the push arm B2 is longitudinally arranged, which will not occupy too much space inside the backrest A, ensuring the compactness of the overall structure of the backrest A.

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

[0040] Please refer toFigure 2 and 4 , 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 slides along the height direction of the mounting base plate 1. The push arm B2 and the second driving mechanism D are arranged on the support plate 2, and the upper end of the support plate B5 is fixedly connected to the support plate 2. A third driving mechanism E is provided on the mounting base plate 1. The third driving 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 the four-way adjustment function of front, back, up and down to meet the personalized adjustment needs of users with different body types.

[0041] Again referring Figure 4 , the third driving mechanism E includes a linear driving unit E1 arranged at one end in the width direction of the mounting base plate 1 and a guiding component E2 arranged at the other end. The linear driving unit E1 can drive the support plate 2 to move up and down, and the guiding component E2 can guide the support plate 2 to move up and down, making the lifting of the support plate 2 on the mounting base plate 1 smoother. Designed in this way, by arranging the push arm B2 and the second driving mechanism D in the middle of the support plate 2, and the linear driving unit E1 and the guiding component E2 at both ends, it has the advantages of reliable, compact structure and small space occupation ratio, which is helpful for the thin design of the product.

[0042] Furthermore, as again Figure 4 shown, the linear driving unit E1 includes a first lead screw E11 extending along the height direction of the mounting base plate 1, a nut sleeve E12 sleeved on the first lead screw E11, and a first motor E13 for driving the nut sleeve E12 to rotate. Among them, the first lead screw E11 is located at the left end of the mounting base plate 1. From Figure 12 it can be seen that both ends of the first lead screw E11 are fixedly supported on the mounting base plate 1 through support seats E3. The first motor E13 is fixedly installed on the support plate 2. The first motor E13 drives the nut sleeve E12 to rotate, which can drive the nut sleeve E12 to move in a spiral up and down along the axial direction of the first lead screw E11, so as to drive 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, there is an easy-to-exist shaking gap in the support plate 2. Therefore, in cooperation with the guiding component E2 at the right end, the shaking gap of the support plate 2 can be absorbed, ensuring the smoothness of the lifting movement of the support plate 2. At the same time, by fixedly installing the first lead screw E11, a more stable support can be provided for the support plate 2.

[0043] As Figure 5As shown, the guiding component E2 includes a guide rail E21 fixedly arranged at 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 Fig. 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 is in sliding contact with the bottom of the guide rail E21. With such a design, the smoothness of the sliding of the support plate 2 is improved, and at the same time, it has the advantage of low cost. In this embodiment, a plurality of groups of third rollers 21 that are rotatably arranged at the bottom of the support plate 2 and are in sliding contact with the mounting base plate 1 are provided. 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 body B and a thrust component for controlling the sliding of the slider D4. A connecting rod D5 is connected between the push arm B2 and the slider D4. The two ends of the connecting rod D5 are respectively hinged to the push arm B2 and the slider D4. When the slider D4 slides, it can drive the push arm B2 to rotate around its rotation center through the connecting rod D5. When the thrust component drives the slider D4 to slide upward, it can drive the push arm B2 to rotate outward synchronously through the connecting rod D5. When the thrust component drives the slider D4 to slide downward, it can drive the push arm B2 to rotate inward synchronously under the linkage action of the connecting rod D5, so that the push arm B2 retracts toward the support plate 2.

[0045] Refer to again Figure 9 and 10 , the thrust component includes a limiting block D2 in contact with the slider D4 and a driving 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 support plate 2 and the slider D4. 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 slide against the resistance of the elastic element D1, so that the push arm B2 rotates toward the support plate 2. When the user uses the front-back adjustment function of the lumbar support, the driving component D3 drives the limiting block D2 to move away from the slider D4. During this process, since the elastic element D1 applies a force to make the slider D4 continuously abut against the limiting block D2, the slider D4 can move synchronously with the limiting block D2. Therefore, it can drive the push arm B2 to rotate outward around its rotation center under the linkage action of the connecting rod D5, so that the lower end of the push arm B2 can push the support plate B5 forward; the driving component D3 drives the limiting block D2 to move toward the slider D4. At this time, the limiting block D2 pushes the slider D4 to slide against the resistance of the elastic element D1, so that it can drive the push arm B2 to rotate inward under the linkage action of the connecting rod D5, and the support plate B5 can return to its original state.

[0046] Under such a structural design, the lumbar support also has a passive collapse function during use. The specific process is as follows: When the push arm B2 pushes the support plate B5 forward, in the event of a vehicle collision or other sudden situation, when the push arm B2 is pressed by an external force, the slider D4 can slide against the resistance of the elastic element D1. Under the linkage action of the connecting rod D5, it can drive the push arm B2 to quickly retract towards the support plate 2. At the same time, the support plate B5 returns to its original flat state, effectively avoiding damage to the human body caused by the lumbar support and improving the safety of using the lumbar support. When the external force disappears, the elastic element D1 resets, which can push the slider D4 to slide, and then drive the push arm B2 to automatically return to the position in the working state. With such a design, it can protect the support plate B5 and the push arm B2 from damage, save costs and eliminate the trouble of replacing parts, and has the advantage of good practicability.

[0047] The elastic element D1 can be a compression spring, a tension spring, a torsion spring, a leaf spring, a spring sheet, etc. In this embodiment, the elastic element D1 is a compression spring. Refer to Figure 9 and 10 , the compression spring abuts 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, moves towards the direction close to the compression spring, and can push the slider D4 to compress the compression spring downward to force the compression spring to store energy. When the slider D4 moves downward, it can drive the push arm B2 to rotate towards the support plate 2 through the connecting rod D5. When the limiting block D2 moves away from the slider D4, that is, moves upward, it 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, so that the push arm B2 can be driven to rotate outward through the connecting rod D5.

[0048] Furthermore, as Figure 9 shown, a guide rod D6 extending along its height direction is fixedly provided on the support plate 2. The compression spring, the slider D4 and the limiting block D2 are sleeved on the guide rod D6 from bottom to top in sequence, and the slider D4 and the limiting block D2 can slide up and down relative to the guide rod D6. With such a design, the reliability of the installation and movement of the elastic element D1, the slider D4 and the limiting block D2 is ensured.

[0049] As Figure 4 and 5 shown, a rotating shaft B1 and a first driving mechanism C for driving the rotating shaft B1 to rotate are rotatably provided on the support plate 2. Among them, two groups of push arms B2 are connected to the rotating shaft B1, and support parts B3 are installed at the ends of the two groups of push arms B2 far away from the rotating shaft B1. Combining Figure 6 and Figure 8 shown, two groups of annular grooves B11 are symmetrically arranged on the rotating shaft B1, and the upper ends of the two groups of push arms B2 are respectively rotatably sleeved on the two annular grooves B11. From Figure 8It can be seen that the side walls on both sides of each annular groove B11 are inclined relative to the center line of the rotating shaft B1, that is, an included angle r is formed between the center line of the annular groove B11 and the center line of the rotating shaft B1. The two sides of the end of the push arm B2 close to the rotating shaft B1 are in sliding contact with the side walls on both sides of the annular groove B11 respectively. When the support plate B5 is at the lowest position in the initial state, the first driving mechanism C drives the rotating shaft B1 to rotate. Under the driving 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 approach and separate 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 spherical hinge. Combining Figure 2 As shown, an opening B51 is provided in the middle of the support plate B5, 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 such a design is that the device can not only realize the lumbar support function, but also has the function of massaging the user's back. Specifically, when using the lumbar support, first, the first driving mechanism C drives the rotating shaft B1 to rotate and transmits it to the push arm B2. Under the constraint of the connecting rod D5, an inclined plane cam transmission is formed between the inclined side wall of the annular groove B11 and the side wall of the push arm B2. Therefore, the rotation of the rotating shaft B1 can force the push arm B2 to swing back and forth along the axial direction 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 swinging trajectories of the two support parts B3 are also symmetric with each other, that is, the two support parts B3 can approach and separate from each other. After the distance between the two support parts B3 is adjusted to be larger, the second driving mechanism D drives the two groups of push arms B2 to rotate outwards to drive the two support parts B3 to push the support plate B5 to protrude forward. The support plate B5 is deformed by the two symmetrically distributed support parts B3 to form a lumbar support. The two support parts B3 can support the left and right ends of the user's waist, and the middle part of the support plate B5 can form an inwardly concave structure under the extrusion of the user's waist, thereby improving the comfort of the lumbar support.

[0051] When using the massage function, the first driving mechanism C drives the rotating shaft B1 to rotate by a certain angle so that the distance between the two supporting parts B3 is adjusted to the minimum. The second driving mechanism D drives the two groups of push arms B2 to rotate outwards to drive the two supporting parts B3 to project forward through the opening B51. After that, the first driving mechanism C drives the rotating shaft B1 to rotate and transmits the rotation to the push arms B2, and the two supporting parts B3 can form a reciprocating swinging kneading massage on the user's waist and back. Then, in cooperation with the third driving mechanism E driving the support plate 2 to slide along the height direction of the mounting base plate 1, it can drive the two supporting parts B3 to move up and down along the meridians on both sides of the user's back spine, so as to simulate the massage function of walking and kneading, improve the massage effect and enrich the functions of the seat. After the massage is over, the first driving mechanism C drives the rotating shaft B1 to rotate by a certain angle so that the distance between the two supporting parts B3 is adjusted to the minimum position, and the second driving mechanism D drives the push arms B2 to rotate inwards, and the two supporting parts B3 are retracted onto the support plate 2 through the opening B51.

[0052] As Figure 4 and 6 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, and the annular groove B11 has two inner side walls a distributed left and right, and the center lines of the two inner side walls a are both inclined relative to the center line of the rotating shaft B1. Combining Figure 7 with this, one end of the push arm B2 has an annular socket hole B21 adapted to the annular groove B11, and the annular socket hole B21 is rotatably sleeved on the annular groove B11. Specifically, both the left and right sides of the annular socket hole B21 have outer side walls b, and the two outer side walls b are respectively matched with the two inner side walls a, and the two outer side walls b are respectively in sliding contact with the two inner side walls a. The first driving mechanism C directly drives the central shaft B12 to rotate, which can drive the sleeve B13 to rotate. As the sleeve B13 continuously rotates, the reciprocating motion of the two inner side walls a of the annular groove B11 can force the annular socket hole B21 to swing back and forth along the axial direction of the central shaft B12, thereby driving the supporting part B3 at the distal end of the push arm B2 to swing left and right.

[0053] Referring to Figure 7 this, for the convenience of assembling the annular socket hole B21, a circular convex block c is detachably installed at one end of the sleeve B13, and an annular boss d protruding outwards is provided on the surface of the sleeve B13 near the circular convex block c. The inner side wall of the circular convex block c and the space surrounded by the inner side wall of the circular convex block c and the circumferential surface of the sleeve B13 form the annular groove B11.

[0054] Please refer to Figure 5 and 11, there are two sets of guide rods D6. The two sets of guide rods D6 are symmetrically arranged along the width direction of the support plate 2. One set of guide rods D6 corresponds to one set of push arms B2. The matching compression springs and connecting rods D5 are also provided in two sets. The two compression springs are respectively sleeved on the two guide rods D6. Both ends of the limit block D2 and both ends of the slider D4 are respectively slidably connected to the two guide rods D6. The two connecting rods D5 are symmetrically arranged on the sides of the two sets of push arms B2.

[0055] Refer again 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 to rotate. The second lead screw D32 extends along the height direction of the support plate 2. The limit block D2 is threadedly sleeved on the second lead screw D32. When the second motor D31 drives the second lead screw D32 to rotate, it can drive the limit 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 the two sets of guide rods D6. Both ends of the limit block D2 and both ends of the slider D4 are respectively slidably connected to the two guide rods D6. When the second motor D31 drives the limit block D2 to move downward, it can drive the slider D4 to simultaneously compress the two compression springs, and then can drive the two sets of push arms B2 to retract inward, ensuring the synchronization of the movement of the two sets of push arms B2.

[0056] It can be seen from Figure 11 that an installation seat D7 is fixedly provided at the lower end of the support plate 2. The ends of the two guide rods D6 are respectively fixedly connected to both ends in the width direction of the installation seat D7. The lower end of the second lead screw D32 is rotatably supported in the middle of the installation seat D7. Considering this way, the reliability of the installation is ensured.

[0057] Finally, it should be noted that the above description is only the preferred embodiment of the present invention. Under the inspiration of the present invention, those of ordinary skill in the art can make various similar representations without violating the purpose and claims of the present invention. Such transformations all fall within the protection scope of the present invention.

Claims

1. An automobile seat lumbar support, characterized in that: It includes a backrest (A), a base body (B) is installed inside the backrest (A), and a support plate (B5) is located on the front side of the base body (B). A push arm (B2) is provided between the base body (B) and the support plate (B5), and the push arm (B2) is arranged vertically between the base body (B) and the support plate (B5). The upper end of the push arm (B2) is rotatably connected to the base body (B), and the lower end abuts against the rear side of the support plate (B5). A second driving mechanism (D) is installed on the base body (B), and the second driving mechanism (D) 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 support plate (B5) to move forward relative to the base body (B).

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

3. The lumbar support for a vehicle seat according to claim 1, wherein: The base body (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 driving mechanism (D), and the support plate (B5) are arranged on the support plate (2). A third driving mechanism (E) is provided on the mounting base plate (1), and the third driving mechanism (E) 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 vehicle seat according to claim 3, wherein: The third driving mechanism (E) includes a linear driving unit (E1) provided at one end in the width direction of the mounting base plate (1) and a guiding component (E2) provided at the other end. The linear driving unit (E1) is used to drive the support plate (2) to move up and down, and the guiding component (E2) is used to guide and support the up and down movement of the support plate (2).

5. The lumbar support for a vehicle seat according to claim 1, wherein: The second driving mechanism (D) includes a slider (D4) slidably installed on the base body (B) and a thrust stopping component for controlling the sliding of the slider (D4). The push arm (B2) is connected to the slider (D4) through a connecting rod (D5). The two ends of the connecting rod (D5) are respectively hinged to the push arm (B2) and the slider (D4). When the slider (D4) slides, it can drive the push arm (B2) to rotate through the connecting rod (D5).

6. The lumbar support for a vehicle seat according to claim 5, wherein: The thrust stopping component includes a limiting block (D2) abutting against the slider (D4) and a driving 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 body (B) 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 externally pressed, the slider (D4) can overcome the resistance of the elastic element (D1) and slide, so that the push arm (B2) moves towards the base body (B).

7. The lumbar support for a vehicle seat according to claim 6, characterized in that: The elastic element (D1) is a compression spring, which abuts between the slider (D4) and the end of the base body (B). When the limit block (D2) moves towards the compression spring, it can force the compression spring to store energy through the slider (D4). When the limit block (D2) moves away from the slider (D4), it 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 limit block (D2).

8. The lumbar support of the vehicle seat according to claim 7, characterized in that: A guide rod (D6) extending along the height direction of the base body (B) is fixedly arranged on the base body (B). The compression spring, the slider (D4) and the limit block (D2) are sleeved on the guide rod (D6) in sequence along the height direction, and the slider (D4) and the limit block (D2) can slide up and down relative to the guide rod (D6).

9. The lumbar support for a vehicle seat according to claim 5, characterized in that: A rotating shaft (B1) and a first driving mechanism (C) for driving the rotating shaft (B1) to rotate are arranged on the base body (B). Two sets of push arms (B2) are connected to the rotating shaft (B1). Support parts (B3) are installed at the ends of the two sets of push arms (B2) far away from the rotating shaft (B1). Two annular grooves (B11) are symmetrically arranged on the rotating shaft (B1). The upper ends of the push arms (B2) are rotatably sleeved on the corresponding annular grooves (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 end of the push arm (B2) close to the rotating shaft (B1) are in sliding contact with the two side walls of the corresponding annular groove (B11) respectively; When the support plate (B5) is in the lowest position, the first driving 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) can be forced to swing reciprocally along the axial direction of the rotating shaft (B1). An opening (B51) is arranged in the middle of the support plate (B5). 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 vehicle 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 arranged on the sleeve (B13). One end of the push arm (B2) has an annular sleeve hole (B21) adapted to the annular groove (B11), and the annular sleeve hole (B21) is rotatably sleeved on the annular groove (B11).

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