JP2008168667A - Seat device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat device for a vehicle capable of allowing a seated person to take a comfortable seating posture when a seatback is turned. <P>SOLUTION: A turning shaft 28 and a second turning shaft 30 are provided on a seat cushion 14 and a seatback 16, respectively, and connected to each other by a second lower arm 32. The seat cushion 14 is divided into a seat cushion front part 14F and a seat cushion rear part 14R at a position behind the first turning shaft 28. During a reclining mode or the like, the seatback 16 is turned around the first turning shaft 28, relative movement between a seated person 90 and the seatback 16 can be suppressed thereby, and the seated person 90 can take a comfortable seating posture. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat device.

  As a seat (vehicle seat) provided in a vehicle, for example, in Patent Document 1, a seat cushion is divided at a portion corresponding to the pelvis of a seated person to form a Pervis support portion, and the Pervis support portion is seated by an adjustment mechanism. There is described a vehicle seat that protrudes upward from the cushion. Patent Document 2 describes a vehicle seat in which a part of the lower portion of the seat back is a pelvic support portion and the lower end portion of the support portion is lowered during the reclining operation and is bulged forward of the seat.

However, in such a vehicle seat device, the relative position of the seat back with respect to the seated person shifts as the reclining angle of the seat back increases. For this reason, the vehicle seat apparatus which can take a more comfortable seating posture at the time of reclining is calculated | required.
JP 2005-52433 A JP 7-257242 A

  In view of the above facts, an object of the present invention is to obtain a vehicle seat device that allows a seated person to take a more comfortable sitting posture when the seat back is rotated.

  In the invention according to claim 1, a seat cushion capable of supporting at least a part of the lower body of the seated person, a seat back capable of supporting at least a part of the upper body of the seated person, A first rotating shaft provided along a direction, a second rotating shaft provided in the seat back along a width direction of the seat back, the first rotating shaft and the second rotating shaft And a connecting member that is rotatably connected to each other.

  In the present invention, the seat back is connected to the seat cushion via the connecting member. Then, there are two rotation centers when the seat back is rotated with respect to the seat cushion, the first rotation shaft and the second rotation shaft. For this reason, for example, when the seat back is tilted backward, the seat back can be tilted backward while following the movement of the upper body of the seated person. Since the relative movement between the seat back and the seated person can be suppressed, the seated person can take a more comfortable seating posture.

  According to a second aspect of the present invention, in the first aspect of the invention, a straight line connecting the contact point TP with the seat back of the seated person and the center of rotation of the upper body during reclining of the seated person is L1, and the contact When the straight line connecting the point TP and the first rotation axis is L2, and the straight line passing through the contact point TP and along the seat back is L3, the angle θ formed by the straight line L1 and the straight line L2 is the straight line L1 and the straight line L3. The position of the first rotation axis is set so as to be smaller than the formed angle α.

  By setting the position of the first rotation shaft in this way, it is possible to more effectively suppress the relative movement between the seat back and the seated person when the seat back is tilted backward.

In invention of Claim 3, in invention of Claim 1 or Claim 2, the said seat cushion is a seat cushion front part in which said 1st rotating shaft was provided, and this seat cushion front part. Divided into a seat cushion rear portion located on the seat back side,
The rear portion of the seat cushion is fixed to the connecting member.

  Therefore, when the connecting member rotates with respect to the front portion of the seat cushion at the first rotating portion, the rear portion of the seat cushion moves in conjunction with this. For this reason, the back part of a seat cushion can be made to approach a seated person, and the clearance gap between a seat cushion and a seated person can be decreased. Thereby, a seated person can take a more comfortable seating posture. In addition, with a simple configuration in which the rear portion of the seat cushion is fixed to the connecting member, the rear portion of the seat cushion can be moved to realize a seat shape with a comfortable sitting posture.

  According to a fourth aspect of the present invention, in the first aspect of the invention according to any one of the first to third aspects, the first driving means for rotating the connecting member around the first rotation shaft, The second drive means for rotating the seat back around two rotation axes, and the control means for controlling the first drive means and the second drive means to interlock with each other.

  Therefore, by interlocking the first drive unit and the second drive unit, the position and angle of the seat cushion and the seat back can be controlled to obtain a desired seat shape, and the seat usability can be improved. .

  Since the present invention is configured as described above, the seated person can take a more comfortable seating posture when the seat back is rotated.

  1 to 3 show a vehicle seat device 12 according to an embodiment of the present invention in a side view. In the drawings, the front of the vehicle is indicated by an arrow FR, the vehicle width direction is indicated by an arrow W, and the upper side is indicated by an arrow UP. Some vehicle seat devices can be rotated around the center of rotation in the vertical direction, and the front of the vehicle and the front of the vehicle seat device may not coincide with each other due to the rotation. The seat device 12 will be described assuming that it is installed facing the front of the vehicle.

  The vehicle seat device 12 includes a seat cushion 14 that supports at least the lower body of the seated person 90, and a seat back 16 that supports at least the upper body of the seated person 90.

  As shown in detail in FIGS. 4 and 5, a seat cushion frame 18 is provided in the seat cushion 14, and the seat cushion frame 18 supports a cushion pad 20. A fixing ring 19 is provided at the front end of the seat cushion frame, and a cushion pad 20 is fixed.

  As shown in FIG. 3, rails 22 are attached to the vehicle body on both sides in the width direction of the vehicle seat device 12, and a first lower arm 24 is provided so as to be movable back and forth along the rails 22. Yes. The first lower arm 24 supports the seat cushion frame 18. On the other hand, also in the seat back 16, the seat back frame 26 arrange | positioned at the width direction both sides of the vehicle seat apparatus 12 is provided.

  A first rotation shaft 28 is set on the first lower arm 24 along the width direction of the vehicle seat device 12 below the hip point HP (see FIGS. 1 to 3) of the seated person 90. A second rotating shaft 30 is also set at the lower portion of the seat back 16 along the width direction of the vehicle seat device 12. The first rotation shaft 28 and the second rotation shaft 30 are connected by a substantially L-shaped second lower arm 32 in a side view. As a result, the second lower arm 32 is rotatable around the first rotation shaft 28 with respect to the seat cushion 14. Further, the seat back 16 is rotatable around the second rotation shaft 30 with respect to the second lower arm 32.

  A first motor 34 is attached between the first lower arm 24 and the second lower arm 32. The first motor 34 exhibits a driving force for rotating the second lower arm 32 around the first rotation shaft 28. A second motor 36 is attached between the second lower arm 32 and the seat back frame 26. The second motor 36 exhibits a driving force for rotating the seat back frame 26 around the second rotation shaft 30.

  As shown in FIG. 6, the first motor 34 and the second motor 36 are controlled and interlocked by a control circuit 38. In addition, a switch unit 40 is connected to the control circuit 38, and the control circuit 38 controls the first motor 34 and the second motor 36 according to the attitude of the vehicle seat device 12 specified by the occupant. The attitude is realized. For example, when the occupant selects a full flat switch provided in the switch unit 40, the first motor 34 and the second motor so that the vehicle seat device 12 is in a so-called full flat state (see FIG. 7C). 36 is driven by a predetermined amount. Of course, it is also possible to drive the first motor 34 and the second motor 36 individually.

  As shown in detail in FIGS. 1 and 2, the cushion pad 20 of the seat cushion 14 is divided into front and rear at a position rearward of the first rotation shaft 28, and the front side of the divided portion is the front portion of the seat cushion. 14F, the rear side is the seat cushion rear portion 14R. As shown in FIGS. 3 to 5, a rod 42 is fixed to the intermediate portion of the second lower arm 32 along the width direction of the vehicle seat device 12. 14R is fixed. Accordingly, when the second lower arm 32 rotates around the first rotation shaft 28, the seat cushion rear portion 14R also moves accordingly.

  As can be seen from FIG. 5, the seat cushion frame 18 supports the cushion pad 20 only at a position corresponding to the seat cushion front portion 14F. Since the seat cushion frame 18 does not support the cushion pad 20 at a position corresponding to the seat cushion rear portion 14R, the seat cushion frame 18 does not hinder the movement of the seat cushion rear portion 14R.

  Next, the operation of this embodiment will be described.

  As shown in FIGS. 2 and 7A, in the vehicle seat device 12 of the present embodiment, the first motor 34 is driven to rotate the second lower arm 32 around the first rotation shaft 28 in the direction of the arrow R1. Can be moved. By the rotation of the second lower arm 32, the seat cushion rear part 14R fixed to the second lower arm 32 via the rod 42 also moves, and approaches the waist 90H (pelvis) of the seated person 90. Accordingly, the waist 90H of the seated person 90 can be held by the seat cushion rear part 14R, and the seated person 90 can take a comfortable sitting posture. At this time, the second motor 36 is also driven to rotate the seat back 16 around the second rotation shaft 30 (arrow R3 direction or arrow R4 direction), so that the angle of the seat back 16 with respect to the seat cushion 14 is increased. Can be set to a desired angle. Of course, only the first motor 34 may be driven without driving the second motor 36, and the angle between the second lower arm 32 and the seat back 16 may be kept constant.

  Further, in the vehicle seat device 12 of the present embodiment, as shown in FIG. 7B, the first motor 34 can be driven to rotate the second lower arm 32 in the arrow R2 direction. Here, even if the first motor 34 is not driven, the rearward tilt angle (reclining angle) of the seat back 16 with respect to the seat cushion 14 increases, but the second motor 36 is further driven to move the seat back 16 to the second position. The rearward tilt angle may be increased by rotating the rotation shaft 30 around in the direction of the arrow R4.

  At this time, since the seat back 16 rotates about the first rotation shaft 28, as a whole, it follows the rotation of the upper body of the seated person 90, that is, the rotation around the hip point HP. Will tilt backwards. For this reason, relative movement between the seated person 90 and the seat back 16 can be suppressed as compared with a vehicle seat device that does not have the first rotation shaft 28. Thus, by reducing the deviation between the seated person 90 and the seat back 16 at the time of reclining, the seated person 90 can take a comfortable sitting posture. Further, the supportability of the vehicle seat device 12 for the seated person 90 can also be improved.

  Further, as shown in FIG. 7C, the rotation of the second lower arm 32 about the first rotation shaft 28 in the direction of the arrow R2 and the arrow R4 of the seat back 16 about the second rotation shaft 30 are provided. By using the rotation in the direction together, the seat back 16 can be made substantially horizontal. At this time, since the rear portion 14R of the seat cushion can be accommodated under the seat back 16, a so-called full flat with few steps (preferably no step) between the seat cushion front portion 14F and the seat back 16. It can be in the state of.

  In particular, in the present embodiment, as shown in FIG. 6, the first motor 34 and the second motor 36 are controlled to operate in conjunction with each other by operating the switch unit 40. That is, the vehicle seat device 12 can be brought into a full flat state only by operating the switch unit 40, and usability is improved.

  In this way, in any case shown in FIGS. 7A to 7C, not only the seatback 16 is rotated around the second rotation shaft 30 but also the first rotation around the first rotation shaft 28. The posture of the seat back 16 can be changed by rotating the two lower arms 32. For this reason, the usability of the vehicle seat device 12 is improved as compared with the configuration without the first rotation shaft 28.

  In addition, the first motor 34 and the second motor 36 can be linked in any posture, not limited to the full flat state shown in FIG. The vehicle seat device 12 can be formed into a desired shape by a simple operation (only by operating the switch unit 40), and the usability is improved in this respect as well.

  Here, when the seat back 16 is tilted backward, the first rotating shaft 28 is provided for following the rotation of the upper body of the seat occupant 90 and reducing the displacement between the seat occupant 90 and the seat back 16. Consider the position of.

  FIG. 8 shows a geometric relationship regarding the hip point HP of the seated person 90, the first rotation shaft 28, and the contact point TP between the seated person and the seat back. In FIG. 8, for the sake of convenience, the hip point HP is indicated as a point O, the contact point TP as a point A, and the first rotation shaft 28 as a point B. Therefore, the straight line OA and the straight line AB in FIG. 8 correspond to the straight line L1 and the straight line L2 in the present invention, respectively. In FIG. 8, the hip point HP of the seated person 90 is introduced as the rotation center of the upper body at the time of reclining, but this rotation center may be a part other than the hip point, such as a sciatic tubercle. Good.

In FIG. 8, the following variables are set.
Torso angle: θ _T
Length of line segment OA: l ₁
Length of line segment OB: l ₂
Angle between line segment OA and vertical line: θ _C
∠OAB: θ

となる。この式（１）に、実際の車両用シート装置１２を想定して、以下の具体的数値を代入してみる（なお、これらの数値はあくまで一例であり、本発明はこれら数値には限定されない）。
θ_Ｔ＝２０°、 ｌ_１＝４５０ｍｍ、
θ_Ｃ＝３０°、 θ_Ｄ＝１０° Here, the seat occupant, shift amount J of a further seat back 16 from the reclining angle of the initial time obtained by rearward inclination angle theta _D, the seated person 90 and the seat back 16 at the contact point TP is

It becomes. In this equation (1), assuming the actual vehicle seat device 12, the following specific numerical values are substituted (note that these numerical values are merely examples, and the present invention is not limited to these numerical values). ).
θ _T = 20 °, l ₁ = 450 mm,
θ _C = 30 °, θ _D = 10 °

Under this condition, for example, when l ₂ = l ₁ = 450 mm and θ = 0 °, J = 0, and the amount of deviation between the seated person 90 and the seat back 16 is minimized.

Here, as an example, considering the relationship between θ and l ₂ such that the deviation amount J is 2.00 mm, when θ = 0 °, l ₂ = 630 mm and J = 2.00 mm. On the other hand, if θ = 1 °, l ₂ = 492 mm and J = 2.00 mm.

Thus, in the above conditions, and when _{l 2} is reduced to 0 ° from 1 ° to theta is constant, theta 138 mm and _{l 2} is a constant (i.e., 492mm-630mm) equivalent effect in the case of reducing the obtained You can see that In the actual vehicle seat device 12, in consideration of layout restrictions and the like, it is easier to realize the effect of reducing the shift amount J by reducing θ than by reducing l ₂ .

である。これら４つの点のいずれにおいてもズレ量Ｊを少なくすることができ、本発明の第一回動軸２８の位置として採用可能であるが、特に、Ｑ→Ｐ→Ｓ→Ｒの順でズレ量Ｊが大きくなる。 In FIG. 9, four positions of points P, Q, R, and S are assumed as positions that can be set as the first rotation shaft 28. The values of θ and l ₂ at each of these positions are

It is. The deviation amount J can be reduced at any of these four points and can be adopted as the position of the first rotation shaft 28 of the present invention. In particular, the deviation amount is in the order of Q → P → S → R. J increases.

Further, as can be seen from FIG. 9, assuming that a straight line L3 passing through the contact point TP and along the front surface of the seat back 16 is assumed, and the angle formed by the straight line L1 and the straight line L3 is α, the magnitude of θ is greater than α. If this is the case, the effect of reducing the deviation amount J will be reduced. Moreover, in terms of actual layout, the first rotation shaft 28 may be located near the rear end of the seat cushion front portion 14F or in the seat cushion rear portion 14R, which may be difficult to arrange. Therefore, the position of the first rotation shaft 28 is preferably a position where θ is smaller than α. Note that the value of the angle α decreases as the seat back 16 tilts backward, and it is assumed that the magnitude relationship between the angle θ and the angle α is reversed when the backward tilt angle exceeds a certain threshold. (Θ is smaller than α) may be satisfied when the rearward tilt angle of the seat back 16 is small, for example, when the torso angle θ _T is the aforementioned angle (θ _T = 20 °).

It is a side view showing a schematic structure of a vehicular seat device of a first embodiment of the present invention. It is a side view which shows schematic structure of the vehicle seat apparatus of 1st embodiment of this invention in the state which the 2nd lower arm rotated. It is a perspective view which expands partially and shows the internal structure of the vehicle seat apparatus of 1st embodiment of this invention. It is a top view which expands partially and shows the internal structure of the vehicle seat apparatus of 1st embodiment of this invention. It is a side view showing a schematic structure of a vehicular seat device of a first embodiment of the present invention. 1 is a block diagram of a vehicle seat device according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows schematic structure of the vehicle seat apparatus of 1st embodiment of this invention, (A) is the state which the 2nd lower arm rotated, (B) is a link lining state, (C) is a full flat state. is there. It is explanatory drawing which shows geometrically the relationship between the backward inclination angle and the 1st rotation axis | shaft in the vehicle seat apparatus of 1st embodiment of this invention. It is explanatory drawing which shows the example of the position of a 1st rotating shaft in the vehicle seat apparatus of 1st embodiment of this invention.

Explanation of symbols

12 Vehicle Seat Device 14 Seat Cushion 14R Seat Cushion Rear Part 14F Seat Cushion Front Part 16 Seat Back 18 Seat Cushion Frame 19 Fixing Ring 20 Cushion Pad 22 Rail 24 First Lower Arm 26 Seat Back Frame 28 First Rotating Shaft 30 Second Time Moving shaft 32 Second lower arm (connecting member)
34 First motor (first driving means)
36 Second motor (second drive means)
38 Control circuit 40 Switch unit 42 Rod 90 Seated person 90H Lumbar HP Hip point TP Contact point

Claims (4)

A seat cushion capable of supporting at least a part of the lower body of the seated person,
A seat back capable of supporting at least part of the upper body of the seated person,
A first rotating shaft provided in the seat cushion along the width direction of the seat cushion; and
A second rotation shaft provided on the seat back along the width direction of the seat back;
A connecting member that is rotatably connected to the first rotating shaft and the second rotating shaft;
A vehicle seat device comprising:   A straight line connecting the contact point TP with the seat back of the seated person and the center of rotation of the upper body during reclining of the seated person is L1, a straight line connecting the contact point TP and the first rotation axis is L2, and the contact point The position of the first rotation axis is set so that the angle θ formed by the straight line L1 and the straight line L2 is smaller than the angle α formed by the straight line L1 and the straight line L3 when the straight line passing through the TP and along the seat back is L3. The vehicle seat device according to claim 1, wherein the vehicle seat device is provided. The seat cushion is divided into a seat cushion front part provided with the first rotation shaft, and a seat cushion rear part located on the seat back side with respect to the seat cushion front part,
The vehicle seat device according to claim 1 or 2, wherein a rear portion of the seat cushion is fixed to the connecting member. First driving means for rotating the connecting member around the first rotation axis;
Second drive means for rotating the seat back around the second rotation axis;
Control means for controlling the first driving means and the second driving means to be interlocked;
The vehicle seat device according to any one of claims 1 to 3, wherein the vehicle seat device is provided.

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