Seat cushion tilting device for vehicle rear seat

Abstract

A seat cushion tilting device of a rear seat of a vehicle can include a tilting function additionally provided to a seat cushion of a rear seat, so that when a seat back is tilted, a front end of the seat cushion is tilted upward, and the tilted front end of the seat cushion fully supports thighs of an occupant seated on the rear seat.

Description

Technical Field

[0001] The present invention relates to a seat cushion tilting device for a vehicle rear seat, and more specifically, to a seat cushion tilting device for a vehicle rear seat configured to adjust the vertical height of the front of the seat cushion to improve the riding comfort of the rear seat occupants. Background Technology

[0002] Typically, a vehicle seat includes a seat back for supporting the occupant's upper body, a seat cushion for supporting the occupant's lower body, and a headrest for supporting the occupant's head. Furthermore, the frames for the seat back and seat cushion are formed by the seat back frame and seat cushion frame, respectively.

[0003] Some high-end cars have rear seats with features such as a seat cushion sliding function to adjust the seat position in response to the forward sliding of the seat cushion, a seat back tilt function to tilt the seat back in response to the forward sliding of the seat cushion and thereby adjust the angle of the seat back, and a function to adjust the angle of the headrest in the fore-aft direction, which helps to improve the comfort of the occupants.

[0004] However, the drawback of traditional rear seats is that they only allow the seat cushion to slide forward and backward, without the ability to adjust the height of the seat cushion. As a result, traditional rear seats cannot adequately support the occupant's thighs, thus failing to improve ride comfort.

[0005] The information included in the background section of this invention is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission of prior art known to those skilled in the art or any form of implication. Summary of the Invention

[0006] Various aspects of the present invention aim to provide a seat cushion tilting device for a vehicle rear seat, wherein the seat cushion forming the rear seat is also given a tilting function, thereby providing sufficient support for the occupant's thighs and further improving the convenience and riding comfort of the rear seat occupant.

[0007] According to various exemplary embodiments of the present invention, a seat cushion tilting device for a vehicle rear seat may include: a seat cushion tilting frame connected to a seat cushion base and tilted by moving up and down relative to the seat cushion base connected to a seat rail; a tilting motor mounted to the seat cushion tilting frame; and a power transmission mechanism connecting the tilting motor, the seat cushion base and the seat cushion tilting frame to tilt the seat cushion tilting frame when the tilting motor is operated.

[0008] The device may include a rear cross tube, which is disposed through the rear end of the seat base frame in a predetermined direction and connected to the rear end of the seat tilt frame. When power from the tilt motor is transmitted to the seat tilt frame via a power transmission mechanism, the entire seat tilt frame can tilt relative to the seat base frame by rotating up and down about the rear cross tube which is configured as a hinge point.

[0009] The tilt motor can be connected externally to one side of the seat tilt frame.

[0010] The power transmission mechanism may include: a pinion gear connected to a tilt motor and rotatably coupled to a seat tilt frame, wherein the pinion gear is configured to rotate relative to the seat tilt frame when the tilt motor is operating; a rack meshing with the pinion gear and configured to move linearly when the pinion gear rotates; a connecting shaft coupled to one end of the rack, passing through a guide slot formed on the seat tilt frame, and movable along the guide slot when the rack moves; a front cross tube configured to pass through the front end of the seat tilt frame in a left-right direction and be rotatable relative to the seat tilt frame; and a linkage assembly coupled to connect the connecting shaft, the front cross tube, and the seat base frame.

[0011] The guide groove can extend in the front and rear direction in front of the pinion in the seat cushion tilting frame, so that the connecting shaft can move along the guide groove in the length direction.

[0012] The linkage assembly may include: a fixed bracket integrally fixed to the front cross tube; a first link rotatably connected at both ends to the connecting shaft and the fixed bracket; and a second link rotatably connected at both ends to the fixed bracket and the seat base.

[0013] The tilting motor, pinion, rack, connecting shaft, and first link can each be a single unit, located only on one side of the seat cushion frame. The fixed bracket and second link can each be two units, located on the left and right sides of the seat cushion frame.

[0014] The tilting motor and power transmission mechanism can be arranged parallel to each other along a straight line in the front-to-back direction to reduce the size of the drive mechanism.

[0015] The pinion can be located inside one side of the seat tilt frame so that it can rotate relative to the seat tilt frame by power received from the tilt motor.

[0016] The rack can be arranged in the front-to-back direction, and its rear part meshes with the pinion.

[0017] The connecting shaft can be positioned to pass through the front end of the rack in the left-right direction, the outer end of the connecting shaft can pass through the guide groove, and the inner end of the connecting shaft can be connected to the linkage assembly.

[0018] The rotational motion of the tilting motor can be converted into linear motion through a pinion, rack, and connecting shaft. The linear motion can be converted back into rotational motion through a linkage assembly and then transmitted to the seat tilting frame. The seat surface angle of the seat tilting frame can be tilted up and down by the transmitted rotational motion.

[0019] The advantage of the seat cushion tilting device according to various exemplary embodiments of the present invention is that the seat cushion forming the rear seat is given a tilting function, such that during the seat back tilting operation, the front end of the seat cushion tilts upward, and the occupant's thighs can be adequately supported by utilizing the upwardly tilted upper end of the seat cushion, thereby further improving the convenience and riding comfort of the rear seat occupant.

[0020] The methods and apparatus of the present invention have other features and advantages, which will be more apparent from or set forth in more detail from the accompanying drawings and the detailed description below, which together serve to explain certain principles of the invention. Attached Figure Description

[0021] Figure 1 and Figure 2 This is a perspective view showing the state of a rear seat equipped with a seat cushion tilting device before tilting, according to various exemplary embodiments of the present invention;

[0022] Figure 3 yes Figure 2 An enlarged view of the part in which the tilting motor is installed;

[0023] Figure 4 This is a view of the part that combines the pinion and rack, seen from one side of the seat cushion tilt frame;

[0024] Figure 5 It is shown in Figure 2 Enlarged view of the opposite side where the tilt motor is not located;

[0025] Figure 6 and Figure 7 This is a view showing the completed tilt state; and

[0026] Figure 8 This is a view showing the state of the seat before and after tilting.

[0027] It is understood that the accompanying drawings are not necessarily drawn to scale, but rather show slightly simplified representations of various features illustrating the basic principles of the invention. Specific design features of the invention as included herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the particular intended application and environment of use.

[0028] In the accompanying drawings, which run throughout the series, reference numerals refer to the same or equivalent parts of the invention. Detailed Implementation

[0029] Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. Although the invention will be described in conjunction with exemplary embodiments thereof, it should be understood that this specification is not intended to limit the invention to those exemplary embodiments. On the other hand, the invention is intended to cover not only the exemplary embodiments thereof, but also various alternatives, modifications, equivalents and other embodiments that may be included within the spirit and scope of the invention as defined by the appended claims.

[0030] The specific structural or functional descriptions of embodiments of the invention included in the specification or application are only for describing exemplary embodiments of the invention according to various exemplary embodiments. Therefore, exemplary embodiments of the invention according to various exemplary embodiments can be implemented in various forms, and the invention should not be construed as limited to the exemplary embodiments described in the specification or application.

[0031] Various changes and modifications can be made to the exemplary embodiments of the present invention, and therefore, the various exemplary embodiments will be shown in the accompanying drawings and described in the specification or application. However, it is understood that embodiments according to the concept of the present invention are not limited to the specific exemplary embodiments disclosed in the present invention, but the present invention includes all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

[0032] Terms such as “first” and / or “second” may be used to describe various elements, but these elements are not limited by these terms. These terms are intended only to distinguish one element from others. For example, without departing from the scope of this invention, a first element may be named a second element, and similarly, a second element may be named a first element.

[0033] When an element is referred to as "connected" or "in contact" with other elements, it is understood that not only is that element directly connected to or in contact with other elements, but there may also be another element between them. Conversely, when an element is referred to as "directly connected" or "directly in contact" with any other element, it is understood that there are no other elements between them. Other expressions describing relationships between structural elements, namely "between" and "only between," or "adjacent" and "directly adjacent," can be interpreted similarly to the above description.

[0034] The terminology used in the various exemplary embodiments of the present invention is for describing particular embodiments only and is not intended to limit the invention. Singular expressions may include plural expressions unless they are clearly different in the context. As used herein, the expressions “comprising” or “having” are intended to specify the presence of the mentioned features, numbers, steps, operations, elements, components, or combinations thereof, and may be construed as not excluding the possible presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0035] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the various exemplary embodiments of the invention pertain. Terms such as those defined in dictionaries of use may be interpreted as having the same meaning as in the context of the relevant field, and should not be construed as having an ideal or overly formal meaning unless explicitly defined in the various exemplary embodiments of the invention.

[0036] The control unit (controller) according to an exemplary embodiment of the present invention can be implemented by a non-volatile memory configured to store data related to an algorithm configured to control the operation of various vehicle components or software instructions for reproducing the algorithm, and a processor configured to perform the operations described below by utilizing the data stored in the respective memory. Here, the memory and processor can be implemented as separate chips. Alternatively, the memory and processor can be implemented as an integrated single chip. The processor can be in the form of one or more processors.

[0037] The following describes in detail, with reference to the accompanying drawings, a seat cushion tilting device for a vehicle rear seat according to an exemplary embodiment of the present invention.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the vehicle seat includes a seat back 1 that supports the upper body of the passenger, a seat cushion 2 that supports the lower body of the passenger, and a headrest 3 that supports the head of the passenger. The frames of the seat back 1 and the seat cushion 2 are formed by the seat back frame 10 and the seat cushion frame 20, respectively.

[0039] Some high-end cars have a seat cushion sliding function that adjusts the seat position in response to the forward sliding of the seat cushion 2, and a seat back tilt function that tilts the seat back 1 backward in response to the forward sliding of the seat cushion 2, thereby adjusting the angle of the seat back 1. This function helps to improve passenger convenience.

[0040] According to various exemplary embodiments of the present invention, when the seat cushion 2 slides forward and the seat back 1 tilts backward (see...), Figure 8 Arrow R1 in the image), the front end of seat cushion 2 is tilted upwards (see arrow R1 in the image). Figure 8 (See arrow M1 in the image). Therefore, the raised seat cushion 2 can fully support the thighs 3a of the passenger 3000, thereby further improving the convenience and comfort of the rear seat passengers.

[0041] Therefore, according to various exemplary embodiments of the present invention, the rear seat cushion tilting device includes: a cushion tilting frame 200, connected to a cushion base 100, and tilted by moving up and down relative to the cushion base 100 connected to the seat guide rail 30; a tilting motor 300, fixed to the cushion tilting frame 200; and a power transmission mechanism 400, connecting the tilting motor 300, the cushion base 100, and the cushion tilting frame 200, so as to tilt the cushion tilting frame 200 when the tilting motor 300 is operated.

[0042] According to various exemplary embodiments of the present invention, the seat cushion frame 20 includes a seat cushion base 100 and a seat cushion tilting frame 200.

[0043] The seat base frame 100 is combined with the seat guide rail 30. The seat guide rail 30 includes a fixed guide rail extending in the front-to-back direction and fixed to the floor, and a movable guide rail connected to the fixed guide rail and moving back and forth on the fixed guide rail. The movable guide rail and the seat base frame 100 are integrally combined.

[0044] The invention further includes a rear transverse tube 500, which is provided to pass through the rear end of the seat base frame 100 in the left-right direction.

[0045] The two ends of the rear horizontal tube 500 are connected to the seat base frame 100 via the first hinge 610.

[0046] The rear end of the seat cushion tilt frame 200 is connected to the rear cross tube 500.

[0047] Therefore, when power from the tilt motor 300 is transmitted to the seat tilt frame 200, the entire seat tilt frame 200 tilts relative to the seat base frame 100 by rotating up and down about the rear cross tube 500 which is configured as a hinge point.

[0048] That is, when the seat cushion tilting frame 200 tilts by moving up and down, the hinge point of the seat cushion tilting frame 200 is the rear cross tube 500.

[0049] The lower end of the seat back frame 10 is integrally fixed to the rear cross tube 500 by welding.

[0050] The tilt motor 300 according to various exemplary embodiments of the present invention is connected to the outside of one side of the seat tilt frame 200.

[0051] That is, according to the general structure of the prior art, the tilt motor is located inside the seat cushion frame, so when the passenger sits down, the motor comes into contact with the passenger, which reduces riding comfort. In addition, when the tilt motor is located inside the seat cushion frame, there is a disadvantage that it needs to solve the problem of interference with the ducts or other additional components required for seat ventilation.

[0052] However, as in various exemplary embodiments of the invention, when the tilt motor 300 is located outside one side of the seat cushion tilt frame 200, the problem of contact with the passenger can be solved, which helps to improve riding comfort. Furthermore, other components can be installed inside the seat cushion tilt frame 200, which can be very helpful in terms of space utilization.

[0053] According to various exemplary embodiments of the present invention, the power transmission mechanism 400 includes: a pinion 410 connected to a tilt motor 300 and rotating relative to the seat tilt frame 200 when the tilt motor 300 is operated; a rack 420 meshing with the pinion 410 and moving linearly when the pinion 410 rotates; a connecting shaft 430 connected to the rack 420, configured to pass through a guide groove 210 formed on the seat tilt frame 200, and moving along the guide groove 210 when the rack 420 moves; a front cross tube 440 configured to pass through the front end of the seat tilt frame 200 in a left-right direction and be rotatable relative to the seat tilt frame 200; and a linkage assembly 450 connected to connect the connecting shaft 430, the front cross tube 440, and the seat base frame 100.

[0054] The pinion 410 is configured to rotatably relative to the seat tilt frame 200 and is connected to the motor shaft 310 of the tilt motor 300. Therefore, when the tilt motor 300 is running, the pinion 410 rotates, and if necessary, it can be a worm gear.

[0055] The rack 420 is arranged back and forth along the length of the seat cushion tilting frame 200, and the rear end of the rack 420 has gear teeth that mesh with the pinion 410, and its opposite front end is integrally connected to the connecting shaft 430 passing through the front end by welding. Therefore, when the rack 420 moves back and forth, the connecting shaft 430 moves back and forth along the guide groove 210 formed on the seat cushion tilting frame 200.

[0056] The front cross tube 440 is arranged parallel to the rear cross tube 500, and the two ends of the front cross tube 440 are rotatable relative to the seat cushion inclined frame 200 via the second hinge 620.

[0057] When the tilting motor 300 operates and the pinion 410 rotates, the rack 420 moves linearly. As the rack 420 moves, the connecting shaft 430 moves linearly along the guide groove 210 formed on the seat tilting frame 200. As the connecting shaft 430 moves, the front end of the seat tilting frame 200 tilts by moving up and down. For this purpose, the guide groove 210 can be located in front of the pinion 410, and to increase the tilt angle, the guide groove 210 can be extended back and forth, allowing the connecting shaft 430 to move back and forth along the guide groove 210.

[0058] According to various exemplary embodiments of the present invention, the linkage assembly 450 includes: a fixed bracket 451 integrally fixed to the front cross tube 440 by welding; a first link 452 rotatably connected at both ends to the connecting shaft 430 and the fixed bracket 451; and a second link 453 rotatably connected at both ends to the fixed bracket 451 and the seat base frame 100.

[0059] One end of the first link 452 is rotatably connected to the connecting shaft 430 via the third hinge 630, and the other end of the first link 452 is rotatably connected to the fixed bracket 451 via the fourth hinge 640.

[0060] One end of the second link 453 is rotatably connected to the fixed bracket 451 via the fifth hinge 650, and the other end of the second link 453 is rotatably connected to the seat base frame 100 via the sixth hinge 660.

[0061] In the apparatus according to various exemplary embodiments of the present invention, in order to reduce weight and manufacturing costs, the tilt motor 300, pinion 410, rack 420, connecting shaft 430, and first link 452 may each be a single unit, and may be located only on one side of the seat cushion frame 20. Furthermore, in order to enable the seat cushion tilting frame 200 to tilt smoothly, the fixing bracket 451 and the second link 453 may each be two units, and may be located on the left and right sides of the seat cushion frame 20.

[0062] According to various exemplary embodiments of the present invention, the tilting motor 300 and the power transmission mechanism 400 are arranged parallel to each other along a straight line in the front-rear direction to reduce the volume of the drive mechanism.

[0063] The pinion 410 is located inside one side of the seat tilt frame 200 and is rotatable relative to the seat tilt frame 200 by power from the tilt motor 300. The rack 420 is arranged in the front-rear direction and its rear end meshes with the pinion 410. The connecting shaft 430 is arranged in the left-right direction, passing through the front end of the rack 420.

[0064] The outer end of the connecting shaft 430, which passes through the front end of the rack 420 in the left-right direction, passes through the guide groove 210 formed on the seat cushion tilt frame 200, and the inner end of the connecting shaft 430 is connected to the first link 452 of the link assembly 450.

[0065] According to various exemplary embodiments of the present invention, the rotational motion of the tilting motor 300 is converted into linear motion via a pinion 410, a rack 420, and a connecting shaft 430. This linear motion is then converted back into rotational motion via a linkage assembly 450 and transmitted to the seat tilting frame 200. The seat surface angle of the seat tilting frame 200 tilts up and down due to the transmitted rotational motion.

[0066] Figure 1 and Figure 2 It shows the state before the tilt. Figure 6 and Figure 7 The state after the tilting is completed is shown.

[0067] In the state before tilting, when the tilting motor 300 is running and the pinion 410 is rotating, the rack 420 moves backward in a straight line. As the rack 420 moves backward in a straight line, the connecting shaft 430 also moves backward in a straight line along the guide groove 210 formed on the seat tilting frame 200.

[0068] When the connecting shaft 430 moves backward, the first link 452, the fixed bracket 451, the front cross tube 440, and the second link 453 rotate, with the second link 453 rotating to stand vertically upright. As the second link 453 rotates, the front cross tube 440 moves upward and the seat tilting frame 200 connected to the front cross tube 440 is lifted upward, thus completing the tilting.

[0069] By rotating the tilt motor 300 in the opposite direction, the vehicle returns to its initial position before tilting in the reverse order described above.

[0070] Figure 8 The dashed lines represent the initial states of the seat back 1 and seat cushion 2 before they are tilted. Solid lines represent the states of the seat back 1 and seat cushion 2 after they are fully tilted.

[0071] According to various aspects of the present invention, in the initial state (indicated by dashed lines) of the seat back 1 and seat cushion 2, when the seat back 1 tilts backward, the seat cushion 2 slides forward accordingly. At this time, the tilting is accomplished by the operation of the tilting motor 300, which lifts the front end of the seat cushion tilting frame 200 upward.

[0072] As described above, when the backrest 1 is tilted to lift the front end of the seat cushion tilting frame 200 upward, the thigh 3a of the passenger 3000 sitting in the seat is fully supported by the upward-lifted seat cushion 2 (state indicated by solid line). Therefore, it has the advantage of further improving the convenience and riding comfort of passengers in the rear seat.

[0073] As described above, according to various exemplary embodiments of the present invention, the seat cushion 2 of the rear seat is additionally provided with a tilting function, so that when the seat back 1 is tilted, the thighs 3a of the passenger 3000 sitting on the rear seat can be adequately supported by tilting the front end of the seat cushion 2 upward. Therefore, it has the advantage of further improving the convenience and riding comfort of the passenger on the rear seat.

[0074] To facilitate interpretation and accurately define the appended claims, features of the exemplary embodiments are described using the terms “upper,” “lower,” “inner,” “outer,” “up,” “lower,” “upward,” “downward,” “front,” “back,” “inner,” “outer,” “inward,” “outer,” “inside,” “outside,” “inner,” “outer,” “forward,” and “backward,” with reference to the locations of the features shown in the accompanying drawings. It will be further understood that the term “connection” or its derivatives refer to both direct and indirect connections.

[0075] For purposes of illustration and description, the foregoing description of specific exemplary embodiments of the invention has been given. These descriptions are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and it will be apparent that many modifications and variations are possible in light of the foregoing teachings. Exemplary embodiments were chosen and described to explain certain principles of the invention and its practical application, enabling others skilled in the art to make and utilize the various exemplary embodiments of the invention and their various alternatives and modifications. The scope of the invention is intended to be defined by the appended claims and their equivalents.

Claims

1. A seat cushion tilting device for a vehicle rear seat, comprising: A seat cushion tilting frame is connected to a seat cushion base frame and tilts by moving up and down relative to the seat cushion base frame connected to a seat rail; A tilt motor is mounted to the seat cushion tilt frame; as well as A power transmission mechanism connects the tilt motor, the seat base frame, and the seat tilt frame to tilt the seat tilt frame when the tilt motor is running. The tilting motor and the power transmission mechanism are arranged parallel to each other along a straight line in the front-to-back direction to reduce the size of the drive mechanism. The power transmission mechanism includes: A pinion gear is connected to the tilt motor and rotatably coupled to the seat tilt frame, wherein the pinion gear rotates relative to the seat tilt frame when the tilt motor is in operation; The rack meshes with the pinion and moves linearly as the pinion rotates. A connecting shaft is attached to one end of the rack, passes through a guide groove formed on the seat cushion inclined frame, and is movable along the guide groove when the rack moves; A front cross tube, passing through the front end of the seat cushion tilt frame in a predetermined direction to be rotatable relative to the seat cushion tilt frame; and The linkage assembly is connected to connect the connecting shaft, the front cross tube, and the seat base frame. The linkage assembly includes: A fixed bracket is integrally fixed to the front horizontal tube; A first link, the first end and the second end of which are rotatably connected to the connecting shaft and the fixed bracket; and The second link has its first and second ends rotatably connected to the fixed bracket and the seat base.

2. The apparatus according to claim 1, further comprising: A rear transverse tube is provided, passing through the rear end of the seat base frame in a predetermined direction, and is connected to the rear end of the seat tilt frame. When power from the tilt motor is transmitted to the seat tilt frame via the power transmission mechanism, the seat tilt frame tilts relative to the seat base by rotating up and down around the rear cross tube configured as a hinge point.

3. The apparatus according to claim 1, wherein, The tilt motor is connected to the outside of one side of the seat cushion tilt frame.

4. The apparatus according to claim 1, wherein, The guide groove is formed to extend along the length of the seat cushion tilting frame in front of the pinion, thereby allowing the connecting shaft to move along the guide groove in the length direction.

5. The apparatus according to claim 1, wherein, The pinion is located inside one side of the seat tilt frame so that it can rotate relative to the seat tilt frame by power received from the tilt motor.

6. The apparatus according to claim 1, wherein, The rack is mounted along the length of the seat cushion tilting frame, and the rear end of the rack meshes with the pinion.

7. The apparatus according to claim 1, wherein, The connecting shaft is disposed passing through the front end of the rack in a predetermined direction; and The outer end of the connecting shaft passes through the guide groove, and the inner end of the connecting shaft is connected to the link assembly.

8. The apparatus according to claim 1, wherein, The rotational motion of the tilting motor is converted into linear motion through the pinion, the rack, and the connecting shaft. The linear motion is then converted back into rotational motion through the linkage assembly and transmitted to the seat tilting frame. The seat surface angle of the seat tilting frame tilts up and down due to the transmitted rotational motion.

9. A seat cushion tilting device for a vehicle rear seat, comprising: A seat cushion tilting frame is connected to a seat cushion base frame and tilts by moving up and down relative to the seat cushion base frame connected to a seat rail; A tilt motor is mounted to the seat cushion tilt frame; as well as A power transmission mechanism connects the tilt motor, the seat base frame, and the seat tilt frame to tilt the seat tilt frame when the tilt motor is running. The power transmission mechanism includes: A pinion gear is connected to the tilt motor and rotatably coupled to the seat tilt frame, wherein the pinion gear rotates relative to the seat tilt frame when the tilt motor is in operation; The rack meshes with the pinion and moves linearly as the pinion rotates. A connecting shaft is attached to one end of the rack, passes through a guide groove formed on the seat cushion inclined frame, and is movable along the guide groove when the rack moves; A front cross tube, passing through the front end of the seat cushion tilt frame in a predetermined direction to be rotatable relative to the seat cushion tilt frame; and The linkage assembly is connected to connect the connecting shaft, the front cross tube, and the seat base frame. The linkage assembly includes: A fixed bracket is integrally fixed to the front horizontal tube; A first link, the first end and the second end of which are rotatably connected to the connecting shaft and the fixed bracket; and The second link has its first and second ends rotatably connected to the fixed bracket and the seat base.

10. The apparatus according to claim 9, wherein, The tilting motor, the pinion, the rack, the connecting shaft, and the first connecting rod are each one unit, and are located only on one side of the seat cushion frame; and There are two fixed brackets and two second connecting rods, located on the left and right sides of the seat cushion frame.

11. The apparatus according to claim 9, wherein, The pinion is located inside one side of the seat tilt frame so that it can rotate relative to the seat tilt frame by power received from the tilt motor.

12. The apparatus according to claim 9, wherein, The rack is mounted along the length of the seat cushion tilting frame, and the rear end of the rack meshes with the pinion.

13. The apparatus according to claim 9, wherein, The connecting shaft is disposed passing through the front end of the rack in a predetermined direction; and The outer end of the connecting shaft passes through the guide groove, and the inner end of the connecting shaft is connected to the link assembly.

14. The apparatus according to claim 9, wherein, The rotational motion of the tilting motor is converted into linear motion through the pinion, the rack, and the connecting shaft. The linear motion is then converted back into rotational motion through the linkage assembly and transmitted to the seat tilting frame. The seat surface angle of the seat tilting frame tilts up and down due to the transmitted rotational motion.

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