Seat adjustment device for a vehicle

Abstract

Seat adjustment device for a vehicle, comprising: an adjustment bracket (100) having a rear part (100b) to which a seat back frame (500) is rotatably connected; and a cushion frame (200) arranged on an upper side of the adjustment bracket (100) and configured to be tilted by a hinge mechanism (300), wherein the joint mechanism (300) comprises: a first hinge member (310) hingedly connected to a front part (100a) of the adjustment bracket (100) and connected to a drive unit (400), and configured to: support a front part (200a) of the cushion frame (200) and move the front part (200a) of the cushion frame (200) up and down based on an operation of a drive unit (400); a second hinge element (320) hingedly connected to a rear part (100b) of the adjustment bracket (100) and hingedly connected to a middle part (200c) or a rear part (200b) of the cushion frame (200), the second hinge element (320) being configured to guide a movement of the rear part (200b) of the cushion frame (200); and a third joint element (330) which is jointly connected to the adjustment bracket (100) and the cushion frame (200) and is arranged between the first joint element (310) and the second joint element (320), wherein the third joint element (330) is designed to determine a tilting position of the cushion frame (200) when the cushion frame (200) rises, wherein the first joint element (310), the second joint element (320) and the third joint element (330) are arranged such that they are spaced apart from each other along a longitudinal direction of the adjustment bracket (100), wherein the adjustment bracket (100) is provided with a base bracket (110), and wherein the second hinge member (320) has a first end hingedly connected to a portion of the base bracket (110) higher than positions of the first hinge member (310) and the third hinge member (330) at the rear of the adjustment bracket (100), and a second end hingedly connected to the middle part (200c) or the rear part (200b) of the cushion frame (200) and extending to be curved downward.

Description

Area

[0001] The present disclosure relates to a seat adjustment device for a vehicle that can realize a stable posture of an occupant. background

[0002] The statements in this section merely provide background information related to the present disclosure and do not constitute prior art.

[0003] Generally, a vehicle is provided with front seats on which a driver and a front passenger sit, with rear seats for additional passengers provided behind the front seats, and with various comfort devices installed on the seats to improve the comfort of the occupants.

[0004] The comfort device mounted on the seat includes, for example, a seat position adjusting device that adjusts the position of the seat by moving the seat forward and backward in accordance with the manipulation by the occupant, a recline adjusting device that adjusts the inclination of a seat back, a height adjusting device that adjusts the height of the seat, or a tilt adjusting device that adjusts the tilt angle of the seat.

[0005] Recently, with the advancement of autonomous vehicles, seat position adjustment has been widely adopted. However, the applicants have found that the prior art tilt adjustment device tilts the seat as a whole, causing the occupant's lower body and buttocks to rise together. Therefore, in the tilt mode, the occupant's seat height is altered, which may lead to problems related to the occupant's uncomfortable sitting posture.

[0006] From US 2003 / 0 218 369 A1 a seat adjustment device for a vehicle is known, comprising: an adjustment bracket having a rear part to which a seat back frame is rotatably connected; and a cushion frame arranged on an upper side of the adjustment bracket and configured to be tilted by a hinge mechanism, wherein the hinge mechanism comprises: a first hinge element hingedly connected to a front part of the adjustment bracket and connected to a drive unit, and configured to: support a front part of the cushion frame and move the front part of the cushion frame up and down based on an operation of a drive unit;a second hinge member hinged to a rear portion of the adjustment bracket and hinged to a middle portion or a rear portion of the cushion frame, the second hinge member configured to guide movement of the rear portion of the cushion frame; and a third hinge member hinged to the adjustment bracket and the cushion frame and disposed between the first hinge member and the second hinge member, the third hinge member configured to determine a tilting position of the cushion frame when the cushion frame rises, the first hinge member, the second hinge member, and the third hinge member being arranged to be spaced apart from each other along a longitudinal direction of the adjustment bracket.

[0007] FR 2 599 313 A1 discloses a vehicle seat with a seat surface adjustable in height and inclination. A front and a rear height adjustment device are provided, each having at least one lever rotatable about a shaft extending transversely of the seat. The cushion support, which is displaceable relative to the seat frame, is supported at bearing points of this lever arranged at a distance from its pivot axis. The front and rear height adjustment devices are connected to a coupling mechanism which, upon actuation of the front device, limits the height adjustment to its support area, while, upon actuation of the rear device, transmits the height adjustment from its support area to the support area of ​​the front device.

[0008] DE 10 2019 211 728 A1 discloses a folding and lowering seat for a vehicle that provides a fatigue-reducing posture. The seat includes a tilt-extension mechanism that enables the tilting and extension of the front end of the seat cushion, and a backrest tilt adjustment device for the folding and lowering seat, such that the tilting to raise the front end of the seat cushion and the extension to extend the front end forward are performed simultaneously when the backrest is tilted.

[0009] Furthermore, DE 10 2017 206 679 A1 also discloses an adjustment device for the longitudinal adjustment of a vehicle seat, comprising at least one rail for defining a longitudinal seat axis along which a seat base of the vehicle seat is adjustable, as well as for supporting at least one adjustment unit of the adjustment device and at least two movably guided adjustment units arranged one behind the other along the longitudinal seat axis, to which the seat base is to be secured in order to be adjustable along the longitudinal seat axis. The at least two adjustment units are adjustable relative to one another along the longitudinal seat axis, and the adjustment device has a common drive for adjusting the at least two adjustment units, by means of which the at least two adjustment units can be adjusted along the longitudinal seat axis both together in one and the same adjustment direction and relative to one another by external power.

[0010] The foregoing description of the background art is intended only to assist in understanding the background of the present disclosure and is not intended to imply that the present disclosure falls within the scope of related art already known to those skilled in the art. overview

[0011] It is therefore an object of the present disclosure to provide a seat adjustment device configured such that, when a seat cushion is tilted, a front part of the seat cushion rises and a rear part of the seat cushion falls, so that the lower body of an occupant does not rise as a whole, to prevent excessive elevation of the occupant's feet. Therefore, the present disclosure can improve comfort by realizing a stable posture of an occupant without requiring a separate footboard to support the occupant's feet.

[0012] The object is achieved by a seat adjustment device having the features of claim 1. Advantageous further developments can be found in the subclaims.

[0013] In one embodiment of the present disclosure, a seat adjustment device for a vehicle may include: an adjustment bracket having a rear portion to which a seatback frame is rotatably connected; and a cushion frame disposed on an upper surface of the adjustment bracket and configured to be tilted by a hinge mechanism. Specifically, the hinge mechanism includes: a first hinge member hinged to a front portion of the adjustment bracket and connected to a drive unit, and configured to: support a front portion of the cushion frame and move the front portion of the cushion frame up and down based on an operation of a drive unit; a second hinge member hinged to a rear portion of the adjustment bracket and hinged to a middle portion or a rear portion of the cushion frame;wherein the second hinge element is configured to guide movement of the rear part of the cushion frame; and a third hinge element that is hingedly connected to the adjustment bracket and the cushion frame and arranged between the first hinge element and the second hinge element, wherein the third hinge element is configured to determine a tilting position of the cushion frame when the cushion frame rises. In one embodiment, the first hinge element, the second hinge element, and the third hinge element are arranged to be spaced apart from each other along a longitudinal direction of the adjustment bracket. The adjustment bracket is provided with a base bracket, and the second hinge element has a first end that is hingedly connected to a portion of the base bracket higher than positions of the first hinge element and the third hinge element at the rear of the adjustment bracket, and a second end,which is hinged to the middle part or the rear part of the upholstery frame and extends to be curved downwards.

[0014] The first hinge member may comprise: at least one guide hinge engaged with the front part of the cushion frame and having a first portion extending downward from the front part of the cushion frame and a second portion provided with a guide slot; and a pivot joint comprising: a first end hingedly connected to the front part of the bracket and a second end inserted into the guide slot of the at least one guide hinge.

[0015] In one embodiment, the second portion of the at least one guide hinge may extend diagonally rearward from the first portion of the at least one guide hinge, and the guide slot may extend in the same direction as an extension direction of the second portion of the at least one guide hinge. In another embodiment, the pivot hinge may be installed to rotate from front to rear as the cushion frame rises.

[0016] In a further embodiment, the at least one guide joint comprises a pair of guide joints provided on a first side and a second side of the bracket.

[0017] The first connecting joint may further comprise a connecting joint configured to pass through the guide slots of the pair of guide joints provided on both sides of the adjusting bracket and pivotally engage with the second end of the pivot joint.

[0018] The drive unit may include a drive motor installed in the front part of the cushion frame, and a power transmission part connected to the drive motor and having a length that varies in a linear direction depending on whether the drive motor is operating, and pivotally connected to the connecting joint and configured to move the pivot joint together with the connecting joint along a guide slot by moving the connecting joint when the drive motor is operating.

[0019] A hinge bracket hinged to the other end of the second hinge member may be provided at the middle or rear part of the cushion frame, and the hinge bracket may be shaped to be inclined obliquely downward.

[0020] The third hinge member may extend diagonally forward from the adjustment bracket and may be connected to the cushion frame and may be shaped to be in a tilted state with respect to a front side even when the cushion frame rises.

[0021] The third hinge member may be positioned in a central part of the cushion frame, and may be hinged to the adjustment bracket and the cushion frame, wherein in case the cushion frame rises, the front part of the cushion frame rises and the rear part of the cushion frame descends, so that a leg part of an occupant is raised and a hip point of the occupant moves downward.

[0022] The third hinge member may be positioned on the side of the rear part of the cushion frame, and may be hinged to the adjustment bracket and the cushion frame, wherein in the case that the cushion frame rises, the front part of the cushion frame is inclined at a larger angle than an angle of the rear part, so that a leg part of an occupant is raised but a hip point of the occupant is maintained.

[0023] The third hinge member may be positioned on the side of the front part of the cushion frame, and may be hinged to the adjustment bracket and the cushion frame, wherein in the case that the cushion frame rises, the rear part of the cushion frame is tilted at a larger angle than an angle of the front part, so that a hip point of an occupant moves downward and is lower than a height at which a leg part of the occupant is raised.

[0024] According to the vehicle seat adjustment device having the above-described structure, when the seat cushion is tilted, the front part of the seat cushion rises and the rear part of the seat cushion descends, thus preventing the occupant's lower body from rising as a whole, preventing the occupant's feet from being excessively raised. This eliminates the need for a separate footboard to support the occupant's feet, thereby improving comfort by maintaining a stable posture for the occupant.

[0025] Further areas of applicability will become apparent from the present description. It should be understood that the description and specific examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. Short description of the drawings

[0026] For a better understanding of the disclosure, various embodiments are described below by way of example, with reference to the accompanying drawings. Fig. 1 is a view showing a seat adjustment device for a vehicle according to one form of the present disclosure; Fig. 2 is a view showing a state before operation of the Fig. 1 shows the seat adjustment device for a vehicle; Fig. 3 is a view showing a state after operation of the seat adjustment device for a Fig. 1 illustrated vehicle; Fig. 4 is a view showing a drive unit and a first joint member of the seat adjustment device for a Fig. 1 shows the vehicle shown; Fig. 5 is a view showing a second joint element of the seat adjustment device for a Fig. 1 shows the vehicle shown; Fig. 6 is a view showing a third joint element of the seat adjustment device for a Fig. 1 shows the vehicle shown; Fig. 7 is a diagram explaining a state before and after an operation in the case where a third joint member is in a reference position; Fig. Fig. 8 is a diagram explaining a state before and after an operation in the case where a third link member is arranged rearward compared to a reference position; and Fig. 9 is a diagram explaining a state before and after an operation in the case where a third joint element is arranged forward compared to a reference position.

[0027] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. Detailed description

[0028] The following description is merely exemplary and is not intended to limit the present disclosure, application, or use. It should be understood that throughout the drawings, corresponding reference characters designate like or corresponding parts and features.

[0029] Hereinafter, a seat adjustment device for a vehicle according to exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0030] Fig. 1 is a view showing a seat adjustment device for a vehicle according to an exemplary embodiment of the present disclosure, Fig. 2 is a view showing a state before operation of the Fig. 1 shows the seat adjustment device for a vehicle, Fig. 3 is a view showing a state after operation of the seat adjustment device for a Fig. 1 vehicle shown shows, Fig. 4 is a view showing a drive unit and a first joint member of the seat adjustment device for a Fig. 1 vehicle shown shows, Fig. 5 is a view showing a second joint element of the seat adjustment device for a Fig. 1 represents the vehicle shown, Fig. 6 is a view showing a third joint element of the seat adjustment device for a Fig. 1 vehicle shown illustrates, Fig. 7 is a diagram explaining a state before and after an operation in the case where a third joint element is in a reference position, Fig. Fig. 8 is a diagram explaining a state before and after an operation in the case where a third joint element is arranged rearward compared to a reference position, and Fig. 9 is a diagram explaining a state before and after an operation in the case where a third joint element is arranged forward compared to a reference position.

[0031] As in the Fig. 1 to 3, the seat adjustment device for a vehicle includes: an adjustment bracket 100 having a rear portion 100b to which a seat back frame 500 is rotatably connected; and a cushion frame 200 disposed on an upper surface of the adjustment bracket 100 and configured to be tilted by a plurality of link mechanisms 300 arranged to be spaced apart from each other along a longitudinal direction of the adjustment bracket 100.

[0032] Here, the adjustment bracket 100 is installed on a movable rail R2 that slides on a fixed rail R1, and moves along the fixed rail R1 together with the movable rail R2. The adjustment bracket 100 may be provided with a base bracket 110, taking into account the installation position of the seat back frame 500, and the seat back frame 500 may be rotatably installed on the base bracket 110 via an adjustment device.

[0033] The adjustment bracket 100 is provided with a plurality of joint mechanisms 300, wherein a seat cushion is tiltably installed via the plurality of joint mechanisms 300.Here, the hinge mechanism 300 may include a first hinge member 310 that is hingedly connected to a front part 100a of the adjustment bracket 100 and configured to support a front part 200a of the cushion frame 200, and that is connected to a drive unit 400 and configured to raise and lower the front part 200a of the cushion frame 200 in response to an operation of the drive unit 400; a second hinge member 320 that is hingedly connected to a rear part 100b of the adjustment bracket 100 and is hingedly connected to a middle part 200c or a rear part 200b of the cushion frame 200 and configured to guide the movement of the rear part 200b of the cushion frame 200; and a third hinge member 330 hingedly connected to the adjustment bracket 100 and the cushion frame 200 and disposed between the first hinge member 310 and the second hinge member 320.In particular, the third joint element 330 is configured to determine a tilting position of the cushion frame 200 in the event that the cushion frame 200 rises.

[0034] That is, since the first hinge member 310 is hinged to the front part 100a of the adjustment bracket 100 and supports the cushion frame 200, the adjustment bracket 100 can rise or fall when the first hinge member 310 is rotated. The first hinge member 310 can be rotated by the drive unit 400 installed on the cushion frame 200 or the adjustment bracket 100.

[0035] The second joint member 320 is pivotally connected to the rear part 100b of the bracket 100 and the middle part 200c or the rear part 200b of the cushion frame 200. Therefore, when the drive unit 400 operates and the front part 200a of the cushion frame 200 rises through the first joint member 310, the rear part 200b of the cushion frame 200 pivotally moves in accordance with the rise of the front part 200a, and thus the tilting operation of the cushion frame 200 can be performed.

[0036] The third joint member 330 is pivotally connected to the adjustment bracket 100 and the cushion frame 200, and is disposed between the first joint member 310 and the second joint member 320, and determines the tilting position of the cushion frame 200 when the cushion frame 200 rises. That is, when the cushion frame 200 rises, the third joint member 330 rotates together with the cushion frame 200 to tilt the cushion frame 200. As described above, since the third joint member 330 rotates together, when the cushion frame 200 rises, the front part 200a of the cushion frame 200 rises, but the rear part 200b of the cushion frame 200 lowers because the rise of the front part 200a is regulated by the third joint member 330.

[0037] As described above, when the drive unit 400 operates, the cushion frame 200 performs a tilting operation in which the front part 200a of the cushion frame 200 rises and the rear part 200b thereof falls by means of the first joint member 310, the second joint member 320, and the third joint member 330, so that an occupant does not rise as a whole, but only the front parts of the occupant's legs rise, thus maintaining a comfortable sitting posture.

[0038] The present disclosure, as described above, will now be described in detail. As will be apparent from the Fig. 2 to 4, the first joint element 310 may comprise a guide joint 311 which engages with the front part 200a of the cushion frame 200, extends downwards and has a guide slot 312 formed thereon, and a pivot joint 313, one end of which is pivotally connected to the front part 100a of the bracket 100 and the other end of which is inserted into the guide slot 312 of the guide joint 311.

[0039] As described above, since the first joint member 310 includes the guide joint 311 and the pivot joint 313, and the pivot joint 313 moves along the guide slot 312 of the guide joint 311, when the pivot joint 313 is rotated, the guide joint 311 performs a linear movement by the rotational movement of the pivot joint 313 to make the cushion frame 200 rise or fall.

[0040] For this purpose, the guide joint 311 may comprise a first portion extending downward from the front part 200a of the cushion frame 200 and a second portion formed with the guide slot 312. In a form as shown in Fig. As shown in Figure 4, the second portion of the guide joint 311 extends diagonally rearward from the first portion of the guide joint 311, and the guide slot 312 may extend in the same direction as the extending direction of the second portion of the guide joint 311. Furthermore, the pivot joint 313 may be installed so as to rotate from front to rear as the cushion frame 200 rises. Accordingly, when the drive unit 400 operates, the pivot joint 313 is rotated from front to rear, and at the same time, the guide joint 311 is lifted by the pivot joint 313 moving along the guide slot 312 to cause the cushion frame 200 to rise.When the cushion frame 200 rises, the rotation direction of the pivot joint 313 and the extension direction of the guide joint 311 may be opposite to each other, and if so, each joint may be exposed to the front of the cushion frame 200, in which case the pivot joint 313 is configured to rotate from front to back and the guide joint 311 is configured to extend rearward.

[0041] Here, the first joint member 310 may further include a connecting joint 314 configured to pass through a guide slot 312 of each guide joint 311 provided on both sides of the adjustment bracket 100 and to be pivotally connected to the other end of each pivot joint 313. Thus, the first joint member 310 provided on both sides of the bracket 100 can be rotated simultaneously through the connection with the connecting joint 314. In the present disclosure, not only a pair of first joint members 310 but also pairs of second joint members 320 and third joint members 330 are provided on both sides of the bracket 100.

[0042] The drive unit 400 that rotates the first joint member 310 includes a drive motor 410 installed in the front part 200a of the cushion frame 200; and a power transmission part 420 that is connected to the drive motor 410 and has a length that varies in a linear direction depending on whether the drive motor 410 is operating, and that is pivotally connected to the link joint 314 and configured to cause the pivot joint 313 to move along a guide slot 312 together with the link joint 314 by moving the link joint 314 backward when the drive motor 410 is operating.

[0043] Here, the drive motor 410 may be a motor capable of forward and reverse rotation, and may be installed on the cushion frame 200 through a motor bracket 411. The power transmission part 420 may be a screw rod that receives a rotational force transmitted from the drive motor 410 and is pulled out or retracted. Furthermore, the power transmission part 420 may be pivotally connected to the connecting joint 314 via a connecting bracket 315 and may be pulled out backward when the drive motor 410 is operating.

[0044] Thereby, when the drive motor 410 operates to move the cushion frame 200 upward, the power transmission part 420 is extended in accordance with the operation of the drive motor 410 to push the connecting joint 314 backward, and the pivot joint 313 connected to the connecting joint 314 is rotated backward and simultaneously moves along the guide slot 312 of the guide joint 311, so that the guide joint 311 is lifted by the pivot joint 313 to move the cushion frame 200 upward. As described above, by moving the connecting joint 314 by a drive unit 400, the guide joint 311 and the pivot joint 313 provided on both sides of the bracket 100 are rotated simultaneously, and thus the cushion frame 200 can be stably moved upward.

[0045] As in Fig. 5, one end of the second hinge member 320 may be hinged to a higher position than the positions of the first hinge member 310 and the third hinge member 330 on the rear side of the bracket 100, and the other end may be hinged to the middle part 200c or the rear part 200b of the cushion frame 200 and extend bent downward.

[0046] That is, the second hinge member 320 may be formed to be curved in a "C" shape, and may have one end hinged to the base bracket 110 provided on the adjustment bracket 100, and the other end hinged to the middle part 200c or the rear part 200b of the cushion frame 200 to perform the tilting operation in accordance with the raising and lowering of the cushion frame 200. The above second hinge member 320 causes a pivot point to be set in the middle part 200c or the rear part 200b of the cushion frame 200, so that the front part 200a of the cushion frame 200 rises while the rear part 200b falls. When the second hinge member 320 is simply formed in a straight line, the second hinge member 320 is rotated upward together to make the cushion frame 200 rise forward when the front part 200a of the cushion frame 200 rises.However, since the second hinge member 320 of the present disclosure is formed to be curved in the "C" shape, it allows the cushion frame 200 to move rearward when the cushion frame 200 rises, and thus the rising operation of the front part 200a and the descending operation of the rear part 200b of the cushion frame 200 can be performed simultaneously.

[0047] Here, a hinge bracket 120 hingedly connected to the other end of the second hinge member 320 may be provided at the middle part 200c or the rear part 200b of the cushion frame 200. The hinge bracket 120 may be formed to be inclined obliquely downward. Accordingly, the second hinge member 320, which is formed to be curved, is connected in a straight line by the hinge bracket 120, so that the second hinge member 320 can stably support the cushion frame 200 via the hinge bracket 120 in terms of inclination in accordance with the raising of the front part 200a and the lowering of the rear part 200b of the cushion frame 200 when the cushion frame 200 rises.

[0048] Furthermore, it is possible, as in Fig. 6, in the case where the front part 200a and the rear part 200b of the cushion frame 200 are formed separately, to provide a structure in which the hinge bracket 120 connects the front part 200a and the rear part 200b of the cushion frame 200 to each other.

[0049] Here, the third joint member 330 may extend diagonally forward from the adjustment bracket 100 and may be connected to the cushion frame 200, and may be configured to be in an inclined state with respect to the front side even when the cushion frame 200 rises. Since the third joint member 330 extends diagonally forward from the adjustment bracket 100, it guides the backward movement of the cushion frame 200 while corresponding to the rise of the front part 200a of the cushion frame 200 when the cushion frame 200 rises. For this purpose, the third joint member 330 may be configured to be shorter than the final length achieved by unfolding the first joint member 310.

[0050] The tilt angle of the cushion frame 200 can be adjusted depending on the installation position of the third joint element 330 between the first joint element 310 and the second joint element 320.

[0051] That is, as in Fig. 7, since the third hinge member 330 is positioned in the middle part 200c of the cushion frame 200 and is hingedly connected to the adjustment bracket 100 and the cushion frame 200, the front part 200a of the cushion frame 200 rises and the rear part 200b of the cushion frame 200 lowers when the cushion frame 200 rises, and thus the leg part of the occupant is raised and the hip point of the occupant moves downward.

[0052] Here, since the third joint member 330 is installed on the middle side between the first joint member 310 connected to the front part 200a of the cushion frame 200 and the second joint member 320 connected to the middle part 200c or the rear part 200b of the cushion frame 200, it allows the front part 200a of the cushion frame 200 to rise and allows the rear part 200b of the cushion frame 200 to lower when the cushion frame 200 rises. That is, as shown in Fig. 7, since the third joint member 330 regulates the rotational position of the cushion frame 200, when the cushion frame 200 rises, the front part 200a of the cushion frame 200 rises by about 31 mm, and the rear part 200b of the cushion frame 200 lowers by about 23 mm.

[0053] This causes the occupant's leg portion to lift and move upwards, and at the same time the occupant's hip point to move downwards.

[0054] Since the third joint element 330, as in Fig. 8, is positioned on the side of the rear part 200b of the cushion frame 200 and is pivotally connected to the bracket 100 and the cushion frame 200, the front part 200a of the cushion frame 200 is inclined at a larger angle than the angle of the rear part 200b when the cushion frame 200 rises, so that the leg part of the occupant is raised but the hip point of the occupant is maintained.

[0055] That is, in the case where the third joint member 330 is installed adjacent to the position where the second joint member 320 is connected to the cushion frame 200 in the rear part 200b of the cushion frame 200, the front part 200a of the cushion frame 200 rises, but the rear part 200b makes the descending length relatively small as the cushion frame 200 rises. Accordingly, as shown in Fig. 8, since the third joint member 330 regulates the rotational position of the cushion frame 200, when the cushion frame 200 rises, the front part 200a of the cushion frame 200 rises by about 30 mm, and the rear part 200b of the cushion frame 200 lowers by about 16 mm.

[0056] This raises the leg section of the occupant, but does not significantly change the height of the occupant's hip point, and thus the position of the hip point can be maintained.

[0057] As in Fig. 9, since the third hinge member 330 is positioned on the side of the front part 200a of the cushion frame 200 and is hingedly connected to the adjustment bracket 100 and the cushion frame 200, the rear part 200b of the cushion frame 200 is inclined at a larger angle than the angle of the front part 200a when the cushion frame 200 rises, and thus the hip point of the occupant moves downward and is lower than the height at which the leg part of the occupant is raised.

[0058] That is, in the case where the third joint member 330 is installed near the position where the first joint member 310 is connected to the cushion frame 200 in the front part 200a of the cushion frame 200, the height at which the front part 200a of the cushion frame 200 rises is relatively small when the cushion frame 200 rises, but the lowering length of the rear part 200b can be highly ensured.

[0059] Accordingly, as in Fig. 9, since the third joint member 330 regulates the rotational position of the cushion frame 200, when the cushion frame 200 rises, the front part 200a of the cushion frame 200 rises by about 17 mm, and the rear part 200b of the cushion frame 200 lowers by about 24 mm.

[0060] This allows the occupant's hip point to move downward and is lower than the height at which the occupant's leg section is raised.

[0061] As described above, when the cushion frame 200 rises, the third joint member 330 allows the front part 200a of the cushion frame 200 to rise and the rear part 200b of the cushion frame 200 to descend, and by changing the tilting trajectory of the cushion frame 200 in accordance with the installation position of the third joint member 330, it is possible to realize an optimal posture corresponding to the sitting posture required by the occupant.

[0062] According to the present disclosure, as described above, the cushion frame 200 is first assembled as shown in Fig. 2. Here, as shown in Fig. 3, when the drive unit 400 operates during the tilting operation of the cushion frame 200, the front part 200a of the cushion frame 200 rises due to the deployment operation of the guide joint 311 and the pivot joint 313 of the first link 310. In this case, the third joint element 330 is also rotated together with the cushion frame 200 and guides the tilting of the cushion frame 200, and when the second joint element 320 is rotated, the front part 200a of the cushion frame 200 rises and the rear part 200b of the cushion frame 200 lowers.

[0063] This prevents the occupant's buttocks from being held too high during seat tilt mode, allowing the occupant's lower body to maintain a stable posture.

[0064] According to the vehicle seat adjustment device with the above-described structure, when the seat cushion is tilted, the front part of the seat cushion rises and the rear part of the seat cushion descends, thus preventing the occupant's lower body from rising as a whole, preventing the occupant's feet from excessively floating. This eliminates the need for a separate footboard to support the occupant's feet, thus improving comfort by realizing a stable posture for the occupant.

Claims

[1] Seat adjustment device for a vehicle, comprising: an adjustment bracket (100) having a rear part (100b) to which a seat back frame (500) is rotatably connected; and a cushion frame (200) arranged on an upper side of the adjustment bracket (100) and configured to be tilted by a hinge mechanism (300), wherein the joint mechanism (300) comprises: a first hinge member (310) hingedly connected to a front part (100a) of the adjustment bracket (100) and connected to a drive unit (400), and configured to: support a front part (200a) of the cushion frame (200) and move the front part (200a) of the cushion frame (200) up and down based on an operation of a drive unit (400); a second hinge element (320) hingedly connected to a rear part (100b) of the adjustment bracket (100) and hingedly connected to a middle part (200c) or a rear part (200b) of the cushion frame (200), the second hinge element (320) being configured to guide a movement of the rear part (200b) of the cushion frame (200); and a third joint element (330) which is jointly connected to the adjustment bracket (100) and the cushion frame (200) and is arranged between the first joint element (310) and the second joint element (320), wherein the third joint element (330) is designed to determine a tilting position of the cushion frame (200) when the cushion frame (200) rises, wherein the first joint element (310), the second joint element (320) and the third joint element (330) are arranged such that they are spaced apart from each other along a longitudinal direction of the adjustment bracket (100), wherein the adjustment bracket (100) is provided with a base bracket (110), and wherein the second hinge member (320) has a first end hingedly connected to a portion of the base bracket (110) higher than positions of the first hinge member (310) and the third hinge member (330) at the rear of the adjustment bracket (100), and a second end hingedly connected to the middle part (200c) or the rear part (200b) of the cushion frame (200) and extending to be curved downward. [2] Seat adjustment device according to claim 1, wherein the first joint element (310) comprises: at least one guide joint (311) which engages with the front part (200a) of the cushion frame (200) and has a first portion extending downward from the front part (200a) of the cushion frame (200) and a second portion provided with a guide slot (312); and a swivel joint (313) comprising: a first end hinged to the front part (100a) of the adjustment bracket (100), and a second end inserted into the guide slot (312) of the at least one guide joint (311). [3] Seat adjustment device according to claim 2, wherein: the second section of the at least one guide joint (311) extends diagonally rearward from the first section of the at least one guide joint (311), the guide slot (312) extends in the same direction as an extension direction of the second portion of the at least one guide joint (311), and the swivel joint (313) is designed to rotate when the cushion frame (200) rises. [4] The seat adjustment device according to claim 3, wherein the at least one guide joint (311) comprises a pair of guide joints (311) provided on a first side and a second side of the adjustment bracket (100). [5] The seat adjustment device according to claim 4, wherein the first joint member (310) further comprises a connecting joint (314) configured to pass through the guide slots (312) of the pair of guide joints (311) and to be pivotally engaged with the second end of the pivot joint (313). [6] Seat adjustment device according to claim 5, wherein the drive unit (400) comprises: a drive motor (410) installed in the front part (200a) of the cushion frame (200); and a power transmission part (420) connected to the drive motor (410) and having a length that is varied in a linear direction based on an operation of the drive motor (410), wherein the force transmission part (420) is designed to: to be pivotally connected to the connecting joint (314), and to move the pivot joint (313) together with the connecting joint (314) along the guide slots (312) by moving the connecting joint (314) when the drive motor (410) is in operation. [7] The seat adjustment device according to claim 1, wherein a hinge bracket (120) hingedly engaged with the second end of the second hinge member (320) is provided at the middle part (200c) or the rear part (200b) of the cushion frame (200), and the hinge bracket (120) is formed to be diagonally inclined downward. [8] The seat adjusting device according to claim 1, wherein the third link member (330) extends diagonally forward from the adjusting bracket (100) and is connected to the cushion frame (200) and is configured to be in a tilted state with respect to a front side even in the event that the cushion frame (200) rises. [9] The seat adjustment device according to claim 1, wherein the third hinge member (330) is positioned in a middle part (200c) of the cushion frame (200) and is hingedly engaged with the adjustment bracket (100) and the cushion frame (200), and wherein, when the cushion frame (200) rises, the front part (200a) of the cushion frame (200) rises and the rear part (200b) of the cushion frame (200) descends, so that a leg part of an occupant is raised and a hip point of the occupant moves downward. [10] The seat adjustment device according to claim 1, wherein the third hinge member (330) is positioned on a side of the rear part (200b) of the cushion frame (200) and is hingedly connected to the adjustment bracket (100) and the cushion frame (200), and wherein, when the cushion frame (200) rises, the front part (200a) of the cushion frame (200) is tilted by a larger angle than an angle of the rear part (200b) so that a leg part of an occupant is raised but a hip point of the occupant is maintained. [11] The seat adjustment device according to claim 1, wherein the third hinge member (330) is positioned on a side of the front part (200a) of the cushion frame (200) and is hingedly engaged with the adjustment bracket (100) and the cushion frame (200), and wherein, when the cushion frame (200) rises, the rear part (200b) of the cushion frame (200) is tilted at a larger angle than an angle of the front part (200a) so that a hip point of an occupant moves downward, which is lower than a height at which the leg part of the occupant is raised.

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