JP5037093B2 - Vehicle seat device - Google Patents

Description

  The present invention relates to a vehicle seat device, and more particularly to a vehicle seat device capable of adjusting the position of a seat back portion.

  2. Description of the Related Art A seat device used for a rear seat of an automobile or the like is known that has a mechanism for adjusting the posture position of a seat back portion. The seat device includes a seating portion having a seat surface on which an occupant is seated, and a seat back portion on which the occupant leans back. In a typical seat device having a mechanism for adjusting the posture position of the seat back part, the seat part slides forward and the seat back part tilts backward by the operation of the occupant.

  In the seat apparatus as described above, the seat back portion moves up and down in accordance with a change in the inclination angle. In addition, the seat back portion is inclined by rotating as a whole while keeping the shape of the seat back portion constant. For this reason, it was not optimal in terms of comfort in comfort. Or since the seating part slides back and forth, there is a problem in that the space at the foot of the passenger is lost. In view of this, a seat device has been proposed that enables a comfortable and comfortable posture by reducing the vertical movement of the occupant and the change in inclination during the movement of the seat back portion (see, for example, Patent Document 1).

  The seat device disclosed in Patent Literature 1 includes a link mechanism that moves a seat back portion, and the link mechanism includes a parallel link mechanism portion. By the parallel link mechanism, the seat device can operate to move the upper body of the occupant in a substantially horizontal direction without moving up and down. Specifically, the seat back portion has a frame bent at the center, and the link mechanism is connected to the upper frame on the upper side.

The link mechanism has a parallelogram parallel link mechanism. Each vertex of the parallel link mechanism serves as a pivot, and each link constituting the parallel link mechanism rotates in operation. When the parallel link is deformed, the frame is bent and the upper frame moves substantially in parallel. As a result, the occupant's vertical movement and change in inclination are reduced, and a comfortable and comfortable posture is made possible.
JP 2003-180476 A

  The seat device proposed by Patent Document 1 is excellent in improving the comfort of the passenger's comfort posture. However, since the mechanism for adjusting the posture position of the seat back portion is complicated, it is difficult to maintain a high adjustment system for the posture position of the seat back portion, and the weight of the apparatus is greatly increased. Further, the space in the vehicle is limited, and it is required to configure a mechanism that adjusts the posture position so as to fit in the smallest possible space.

  A vehicle seat device according to an aspect of the present invention includes a seat back portion and an adjustment mechanism that is coupled to the seat back portion and moves the seat back portion to adjust its posture position. The adjustment mechanism is connected to the rotation shaft that moves linearly and the rotation shaft, and moves the seat back portion by rotating to the opposite side of the movement direction according to the movement of the rotation shaft. A link for changing the posture position is provided. Depending on the configuration of the adjusting device, the adjusting mechanism can be configured with a simple structure having accuracy and strength.

  Preferably, an arm including the link and the rotation shaft and extending and contracting according to the movement of the seat back portion moves linearly with the rotation shaft in a direction opposite to the movement direction of the rotation shaft. A moving shaft and a second rotating shaft connected to the second rotating shaft and moving in the opposite direction to the link according to the movement of the second rotating shaft to move the seat back portion and change its posture position. Two links are further provided. As a result, the seat back portion can be more reliably supported and moved.

  The seat back portion includes a lower frame and an upper frame that is flexibly connected to the lower frame, and the adjustment mechanism moves the upper frame in the front-rear direction to move the posture position of the seat back portion. Is preferably changed. As a result, a more comfortable occupant's comfortable posture can be realized with a simple configuration.

  The rotation shaft and the second rotation shaft are connected to a linear drive shaft, and the rotation shaft and the second rotation shaft move in opposite directions on the drive shaft as the drive shaft rotates. It is preferable to do. As a result, the drive shaft can be reliably moved with a simple and compact configuration. Moreover, it is preferable that the said link and the said 2nd link cross | intersect. Thereby, the adjustment mechanism can be made more compact.

  In a preferred example, the adjustment mechanism is connected to the opposite side of the second link of the second link and the third link that is rotatably connected to the opposite side of the rotation axis of the link. A fourth link, and the third and fourth links move according to the expansion and contraction of the arm to move the seat back portion and change its posture position. Thereby, the movement distance of the seat back part with respect to the movement distance of the rotation shaft can be increased. Furthermore, it is preferable that the third and fourth links intersect each other. Thereby, the adjustment mechanism can be made more compact.

  According to the present invention, in the vehicle seat device, the adjustment mechanism that adjusts the posture position of the seat back portion can be configured with a simple structure having accuracy and strength.

  Hereinafter, embodiments to which the present invention can be applied will be described. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. Moreover, in each drawing, the same code | symbol is attached | subjected to the same element and the duplication description is abbreviate | omitted as needed.

  FIG. 1 schematically shows a partial configuration of a vehicle seat device 1 according to the present embodiment. The vehicle seat device 1 includes a seating portion (not shown) having a seating surface on which an occupant is seated, and a seatback portion 11 that is a backrest portion on which the seated occupant leans back. Further, the vehicle seat device 1 of the present embodiment further includes an adjustment mechanism 12 that moves the seat back portion 11 in the front-rear direction and adjusts the posture position thereof. The adjustment mechanism 12 can be mainly formed of a steel material. The vehicle seat device 1 illustrated in FIG. 1 is used as a rear seat of an automobile or an automobile seat having only one row of seats.

  In FIG. 1, only a part of the components of the seat back part 11 is shown. Specifically, a headrest 111 on which the occupant leans against the back of the head, and a frame 112 as a framework for supporting the entire seat back part 11 It is shown. In addition to these components, the seat back portion 11 includes a cushion member provided on the outer periphery of the frame 112, a skin member that covers the surface of the cushion member, and the like.

  FIG. 1 shows two different states of the seat back portion 11. In the first state, which is a normal state, the seat back portion 11 is located in the foremost position and is not in a so-called comfort posture. In another second state, the seat back portion 11 is moved rearward from the first state in a so-called comfortable posture state. In FIG. 1, the occupant and adjustment mechanism 12 is in the first state, and only the seat back portion 11 is shown in two states, the first state and the second state. In the present specification, the seat surface side of the seat back portion 11 is defined as the front side, and the opposite side where the adjustment mechanism 12 is provided is defined as the rear side. Also, the seating portion side is the lower side, and the headrest 111 side is the upper side. This corresponds to the front and rear and up and down directions of a seated occupant.

  As shown in FIG. 1, the frame 112 has a lower lower frame 113 and an upper upper frame 114. The lower end of the lower frame 113 is connected to the fixed bracket 117 by a bolt 116. The bolt 116 is fixed to a fixed bracket 117, and the bracket 117 is fixed to the automobile main body. The lower frame 113 can rotate around the bolt 116. The lower frame 113 and the upper frame 114 are connected via a bolt 115, and the frame 112 can be bent with the bolt 115 as an axis.

  The adjustment mechanism 12 is fixed to the vehicle main body 41 on the back side. The adjustment mechanism 12 is connected to the upper frame 114 and moves the upper frame 114 in the front-rear direction. As the upper frame 114 moves, the lower frame 113 rotates about the bolt 116 and rotates about the bolt 115 at the upper end. In other words, the frame 112 bends in the front-rear direction around the bolt 115 as the posture position of the seat back portion 11 changes. Specifically, the frame 112 bends forward.

  The adjustment mechanism 12 translates the upper frame 114. The adjustment mechanism 12 has an upper arm 121a on the upper side and a lower arm 121b on the lower side. The upper arm 121 a and the lower arm 121 b are connected to the upper frame 114 via a support bracket 122 that is a part of the adjustment mechanism 12. As the upper arm 121a and the lower arm 121b expand and contract, the upper frame 114 moves in parallel. The movement direction of the upper frame 114 is the same as the expansion / contraction direction of the upper arm 121a and the lower arm 121b, and the inclination does not substantially change by the movement.

  On the other hand, the lower frame 113 rotates around the bolt 116 and also rotates around the bolt 115. That is, as the upper arm 121a and the lower arm 121b contract, the frame 112 bends with the bolt 115 as an axis. As described above, the frame 112 bends around the bolt 115 according to the change in the posture position of the seat back portion 11, so that the upper arm 121a moves in parallel, and the fluctuation of the vertical position and the inclination of the occupant are reduced. Can provide a comfortable comfort posture.

  FIG. 2 is a perspective view showing the structure of the frame 112 and the connection state between the frame 112 and the adjusting mechanism 12. The frame 112 includes a U-shaped lower frame 113 having three sides and an upper frame 114 having a U-shape having three sides. These are rotatably connected by two bolts 115a and 115b to constitute a rectangular frame 112. The upper side of the upper frame 114 is coupled to the coupling bracket 123 by welding, and the coupling bracket 123 is fixed to the support bracket 122 with bolts. Further, the upper frame 114 is fixed to the support bracket 122 by a support bar 128 on the lower end side thereof.

  FIG. 3 is an exploded perspective view showing the structure of the adjustment mechanism 12. The adjustment mechanism 12 has a base plate 124 on the rear side, and the base plate 124 is firmly fixed to the vehicle main body 41 with bolts. The upper arm 121a is connected to the base plate 124 via the upper drive shaft 125a on the upper side. The lower arm 121b is connected to the base plate 124 via a lower lower drive shaft 125b. The upper drive shaft 125a and the lower drive shaft 125b are columnar rods extending in the left-right direction. FIG. 3 shows a state where the upper arm 121a and the lower arm 121b are most extended.

  The upper arm 121a and the lower arm 121b have substantially the same structure. Therefore, in the following, the details of the structure of the upper arm 121a will be described. The upper arm 121a has two links, an upper link 211a on the upper side and a lower link 211b on the lower side. The upper link 211a is located above the upper drive shaft 125a, and the lower link 211b is located below the upper drive shaft 125a.

  The upper link 211a is connected to the rotation shaft 212a and can rotate about the rotation shaft 212a. Similarly, the lower link 211b is connected to the rotation shaft 212b and can rotate about the rotation shaft 212b. The rotation shaft 212a and the rotation shaft 212b are connected to a linear upper drive shaft 125a. The axial direction of the rotation shaft 212a and the rotation shaft 212b is the vertical direction, and is perpendicular to the axial direction of the upper drive shaft 125a.

  The upper link 211a is connected to the support bracket 122 on the tip side opposite to the rotation shaft 212a. The bearing hole 214a of the upper link 211a is loosely fitted to the rotation shaft of the support bracket 122, and the upper link 211a is rotatably connected to the support bracket 122. The pivot shaft is fixed at the support bracket 122. Therefore, the position of the bearing hole 214a at the tip of the upper link 211a with respect to the support bracket 122 is fixed and constant.

  Similarly, the lower link 211b is connected to the support bracket 122 on the tip side opposite to the rotation shaft 212b. The bearing hole 214b of the lower link 211b is loosely fitted to the rotation shaft of the support bracket 122, and the lower link 211b is rotatably connected to the support bracket 122. The pivot shaft is fixed at the support bracket 122. Therefore, the position of the bearing hole 214b at the tip of the lower link 211b with respect to the support bracket 122 is fixed and constant.

  The upper link 211a and the lower link 211b that extend linearly forward from the upper drive shaft 125a are parallel to each other, and the bearing hole 214a is connected to the support bracket 122 above the bearing hole 214b. Since the upper link 211a and the lower link 211 are separated from each other in the vertical direction, the respective rotations are not hindered.

  The adjustment mechanism 12 has a drive motor 126 fixed to the base plate 124. The drive motor 126 has a motor rotation shaft 127 extending in the vertical direction. The motor rotation shaft 127 is connected to the upper drive shaft 125a and the lower drive shaft 125b, and rotates each of them. As the upper drive shaft 125a and the lower drive shaft 125b rotate, the upper arm 121a and the lower arm 121b expand and contract. The expansion and contraction operations of the upper arm 121a and the lower arm 121b are the same. Accordingly, the operation of the upper arm 121a will be described below.

  FIG. 4 is a plan view showing the expansion / contraction operation of the upper arm 121a. 4A shows a state in which the upper arm 121a is most extended, and FIG. 4B shows a state in which the upper arm 121a is most contracted. In accordance with the rotation of the upper drive shaft 125a, the rotation shaft 212a and the rotation shaft 212b move on the upper drive shaft 125a. The rotation shaft 212a and the rotation shaft 212b move in opposite directions. The rotation shaft 212a and the rotation shaft 212b are connected to the upper drive shaft 125a via a screw tap or a gear mechanism, and the rotation shaft 212a and the rotation shaft 212b are moved by the rotational force of the upper drive shaft 125a. Can do.

  When the upper arm 121a contracts as in the change from the state of FIG. 4A to the state of FIG. 4B, the rotating shaft 212a and the rotating shaft 212b move away from each other. In the example of FIG. 4, the rotation shaft 212a moves linearly to the right and the rotation shaft 212b moves linearly to the left. The upper link 211a and the lower link 211b rotate in accordance with the movement of the rotation shaft 212a and the rotation shaft 212b.

  The rotation direction of the upper link 211a is opposite to the movement direction of the rotation shaft 212a. In the example of FIG. 4, the upper link 211a rotates to the left (counterclockwise). On the other hand, the rotation direction of the lower link 211b is the opposite direction to the movement direction of the rotation shaft 212b, and rotates to the right (clockwise) in the example of FIG. That is, the rotation directions of the upper link 211a and the lower link 211b are opposite. As described above, the rotation shaft 212a and the rotation shaft 212b are connected to the upper drive shaft 125a via a screw tap or a gear mechanism, and the rotation shaft is driven by the action of the screw or gear according to the rotation of the upper drive shaft 125a. 212a and the rotation shaft 212b rotate.

  When the upper arm 121a extends as in the change from the state of FIG. 4B to the state of FIG. 4A, the operations of the rotating shaft 212a and the rotating shaft 212b, the upper link 211a, and the lower link 211b This operation is opposite to the case where the upper arm 121a contracts. That is, the rotation shaft 212a and the rotation shaft 212b move in a direction approaching each other. Further, the upper link 211a rotates to the right (clockwise), and the lower link 211b rotates to the left (counterclockwise).

  Here, the distal ends of the upper link 211 a and the lower link 211 b are fixed ends fixed to the support bracket 122. Accordingly, the distance and the positional relationship between the bearing hole 214a of the upper link 211a and the bearing hole 214b of the lower link 211b are not changed by the expansion and contraction of the upper arm 121a. Since the rotation shaft 212a, the rotation shaft 212b, the upper link 211a, and the lower link 211b operate as described above, the configuration of the upper arm 121a can be made simple and compact.

  Here, as shown to Fig.4 (a), the upper link 211a and the lower link 211b are arrange | positioned so that it may cross | intersect. That is, in the left-right direction parallel to the upper drive shaft 125a, the positional relationship between the rotating shaft 212a and the rotating shaft 212b is opposite to the positional relationship between the bearing hole 214a and the bearing hole 214b. By crossing the upper link 211a and the lower link 211b in this way, the maximum distance between the rotating shaft 212a and the rotating shaft 212b as shown in FIG. 4B can be reduced. In other words, the length of the upper drive shaft 125a and the width of the adjustment mechanism 12 can be reduced with respect to the same expansion / contraction distance (the back-and-forth movement distance of the seat back).

  FIG. 5 schematically shows several configurations of a rotation shaft and a link that can be applied to the upper arm 121a and the lower arm 121b. The configuration of FIG. 5A corresponds to the above-described embodiment, and the drive shaft 511 corresponds to the upper drive shaft 125a or the lower drive shaft 125b. The first rotation coaxial 512a corresponds to the rotation shaft 212a, and the second rotation shaft 512b corresponds to the rotation shaft 212b. The first link 513a corresponds to the upper link 211a, and the second link 513b corresponds to the lower link 211b. The first bearing hole 514a corresponds to the bearing hole 214a, and the second bearing hole 514b corresponds to the bearing hole 214b.

  The operations of the first and second coaxials 512a and 512b and the first and second links 513a and 513b are as described above. That is, the first and second bearing holes 514a and 514b are driven by the rotation of the first and second links 513a and 513b according to the linear movement of the first and second coaxials 512a and 512b. The distance to the axis 511 increases or decreases. The first and second links 513a and 513b always cross each other when viewed from the axial direction of the coaxials 512a and 512b. In the axial direction of the drive shaft 511, the distance between the first and second bearing holes 514a and 514b is always constant.

  FIG. 5B shows an arm structure configured such that the first and second bearing holes 514a and 514b substantially completely overlap each other. Specifically, when viewed from the axial direction of the first and second coaxials 512a and 512b, the positions of the first and second bearing holes 514a and 514b coincide. For this reason, the first and second links 513a and 513b do not cross when viewed from the axial direction of the first and second coaxials 512a and 512b.

  In the arm structure of FIG. 5B, the movement distance of the first and second rotational coaxials 512a and 512b, that is, the required length of the drive shaft 511 is larger than that of the arm structure of FIG. Therefore, from this viewpoint, the arm structure shown in FIG. 5A is preferable to the arm structure shown in FIG. However, for example, by fitting the first and second bearing holes 514a and 514b to the same shaft, the arm structure of FIG. 5B is simpler than the arm structure of 5A. It can be.

  The arm structure shown in FIG. 5 (c) includes more links than the configurations shown in FIGS. 5 (a) and 5 (b). Specifically, the arm structure of FIG. 5C has a third link 513c and a fourth link 513d in the second stage in addition to the first and second links 513a and 513b in the first stage. is doing. Furthermore, it has the 3rd rotating shaft 512c and the 4th rotating shaft 512d. The first link 513a is connected to the first rotation shaft 512a and the fourth rotation shaft 512d. The second link 513b is connected to the second rotation shaft 512b and the third rotation shaft 512c. The first and second links 513a and 513b intersect as in the structure of FIG.

  The third link 513c is rotatably connected to the third rotation shaft 512c, and has a first bearing hole 514a on the distal end side thereof. The fourth link 513d is rotatably connected to the fourth rotation shaft 512d, and has a second bearing hole 514b on the tip side. The third and fourth links 513c and 513d intersect in the same manner as the first and second links 513a and 513b in FIG.

  When the first and second coaxials 512a and 512b move on the drive shaft 511, the third and fourth rotational axes 512c and 512d move in the same direction as the first and second coaxials 512a and 512b. At the same time, it also moves in the front-rear direction (arm extension / contraction direction). Specifically, when the arm structure extends, the first and second links 513a and 513b rotate when the first and second coaxials 512a and 512b are translated so as to approach each other. The direction of rotation is the same as the structure of FIGS. 5 (a) and 5 (b). In accordance with this, the third and fourth rotation shafts 512c and 512d are also translated so as to approach each other. Furthermore, the third and fourth rotation shafts 512c and 512d move in parallel toward the front so as to be separated from the drive shaft 511.

  When the third and fourth rotation shafts 512c and 512d move so as to approach each other, the third and fourth links 513c and 513d rotate and the first and second bearing holes 514a and 514b move forward. Translate to. The rotation directions of the third and fourth links 513c and 513d are the same as those of the first and second links 513a and 513b, respectively. Note that the first and second bearing holes 514a and 514b also move by the amount of forward movement of the third and fourth rotating shafts 512c and 512d. When the arm structure in FIG. 5C is contracted, the operation of each component is the reverse of the above-described expansion.

  The arm structure shown in FIG. 5 (c) is more complicated than the arm structure shown in FIG. 5 (a). However, the arm structure shown in FIG. The amount of movement of the seat back can be increased with respect to the amount of movement of the moving shaft in the left-right direction. In the arm structure of FIG. 5C, the positions of the first and second bearing holes 514a and 514b may be matched as shown in FIG. 5B. In this case, similarly to the first and second links 513a and 513b in FIG. 5B, the third and fourth links 513c and 513d are separated from each other without intersecting when the arm structure is most extended. It will be.

  As mentioned above, although this invention was demonstrated taking preferable embodiment as an example, this invention is not limited to said embodiment. A person skilled in the art can easily change, add, and convert each element of the above-described embodiment within the scope of the present invention. For example, in the above-described preferred embodiment, the upper drive shaft 125a and the lower drive shaft 125b (hereinafter referred to as drive shaft) extend in the left-right direction of the seat device 1, but these axial directions become the vertical direction of the seat device 1. Further, the upper drive shaft 125a and the lower drive shaft 125b may be disposed. In this case, the drive motor 126 is arranged so that the motor rotation shaft 127 extends in the vertical direction.

  In addition, if the axial direction of the drive shaft on which the rotation shaft moves is along the backrest surface of the seat back portion (surface on which the back of the occupant contacts), the necessary space is reduced. Can do. In this state, the surface on which the rotation link rotates is parallel to the drive shaft to which the rotation link is fixed, and is substantially perpendicular to the backrest surface of the seat back portion. Accordingly, the moving direction of the upper frame is a direction perpendicular to the axial direction of the drive shaft, and the seat back portion similarly moves in a direction substantially perpendicular to the axial direction of the drive shaft.

  The adjustment mechanism preferably has two or more arms such as the upper arm 121a and the lower arm 121b. However, when the seat back portion can be driven firmly, the posture of the seat back can be achieved with one arm. The position may be adjusted. Each arm preferably has links on both sides of the corresponding drive shaft, like the upper link 211a and the lower link 211b. However, if the seat back portion can be firmly fixed, You may comprise an arm only.

  If there are two arms, if the seat back can be reliably driven, one arm and the other arm have different ones of the upper link 211a and the lower link 211b. You may comprise as follows. That is, the upper arm 121a has only the upper link 211a, and the lower arm 121b has only the lower link 211b. Further, if the seat back part can be securely fixed and moved, it is excluded to adjust the posture position of the seat back part with one arm having only one of the upper link 211a or the lower link 211b. is not.

  As described above, the drive motor and the drive shaft for driving the arm are preferably fixed to the vehicle main body side, but fixing this to the seat device by design is not excluded. Further, the arm may be directly connected to the frame without using a member such as a support bracket. The adjustment mechanism of the present invention is preferably applied to a seat device having a frame of a folded seat back portion that bends as described above, but can also be applied to other types of seat devices.

It is a figure which shows typically a partial structure of the vehicle seat apparatus which concerns on embodiment of this invention. It is a perspective view which shows the structure of the frame which concerns on embodiment of this invention, and the connection state of a frame and the adjustment mechanism 12. FIG. It is a disassembled perspective view which shows the structure of the adjustment mechanism which concerns on embodiment of this invention. It is a top view which shows the expansion-contraction operation | movement of the upper arm which concerns on embodiment of this invention. It is a figure which shows typically some structures of the rotating shaft and link which can be applied to the upper arm and lower arm which concern on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat apparatus, 11 Seat back part, 12 Adjustment mechanism, 41 Vehicle main-body part 111 Headrest, 112 Frame, 113 Lower frame 114 Upper frame, 115a, 115b Bolt, 116 Bolt 117 Fixing bracket, 121a Upper arm, 121b Lower arm 122 Support bracket, 123 Coupling bracket, 124 Base plate 125a Upper drive shaft, 125b Lower drive shaft, 126 Drive motor 127 Motor rotation shaft, 124 Base plate, 128 Support bar 211a Upper link, 211b Lower link, 212a, 212b Rotating shaft 214a, 214b Bearing hole, 511 drive shaft, 512a first coaxial 512b second rotation shaft, 512c third rotation shaft, 512d fourth rotation shaft 513a first link, 13b second link, 513c third link 513d fourth link, 514a first bearing hole, 514b a second bearing hole

Claims (5)

A vehicle seat device comprising: a seat back part; and an adjustment mechanism coupled to the seat back part and configured to move the seat back part and adjust its posture position;
The adjustment mechanism is
A first drive shaft extending in the width direction of the vehicle;
A second drive shaft extending in the width direction of the vehicle and positioned below the first drive shaft;
A first arm that engages with the first drive shaft and moves the seat back portion by extending and contracting;
A second arm having a structure independent of the first arm, which engages with the second drive shaft and moves the seat back part by extending and contracting,
The first arm is
A first rotation shaft that moves while rotating on the first drive shaft as the first drive shaft rotates;
The first pivot is connected to the first pivot shaft and pivots in the direction opposite to the moving direction according to the movement of the first pivot shaft, thereby moving the seat back portion and changing its posture position. And a link
The second arm is
A second rotation shaft that moves while rotating on the second drive shaft by rotating the second drive shaft;
A second connected to the second rotation shaft and rotated to the opposite side to the moving direction according to the movement of the second rotation shaft, thereby moving the seat back portion and changing its posture position. And the link
A vehicle seat device comprising:   The first arm is
    A third rotating shaft that engages with the first driving shaft and rotates in the direction opposite to the moving direction of the first rotating shaft while rotating by rotating the first driving shaft; ,
    The first pivot shaft is connected to the third pivot shaft, and moves in the opposite direction to the first link according to the movement of the third pivot shaft, thereby moving the seat back portion and changing its posture position. 3 links, and
  The second arm is
    A fourth rotating shaft that engages with the second driving shaft and rotates in the direction opposite to the moving direction of the second rotating shaft while rotating by rotating the second driving shaft; ,
    A second coupling is connected to the fourth pivot shaft, and moves in the opposite direction to the second link according to the movement of the fourth pivot shaft, thereby moving the seat back portion and changing its posture position. 4 links,
  The vehicle seat device according to claim 1. The seat back portion includes a lower frame and an upper frame connected to the lower frame so as to be bent.
The adjustment mechanism changes the posture position of the seat back part by moving the upper frame in the front-rear direction.
The vehicle seat device according to claim 1 or 2.   The first link and the third link intersect, the second link and the fourth link intersect,
  The vehicle seat device according to claim 2 or 3.   A lower end of the lower frame is connected to a rotation shaft fixed to the vehicle body,
  The lower frame rotates on the rotation shaft fixed to the vehicle body according to the operation of the adjustment mechanism.
  The vehicle seat device according to claim 3.

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