Vehicle seat device

Abstract

To provide a seating device for a vehicle capable of sufficiently supporting an occupant even when a seat back is inclined backward.SOLUTION: In the vehicular seating device 100 including a vehicular seat 10 and a seat belt 40, the vehicular seat 10 includes a side frame 13, a seat back frame 14, and a reclining mechanism 20 for tilting a seat back 12 backward, and the seat belt 40 has a belt buckle 42 and a belt anchor 44 connected to a bracket 23.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle seating device structure including a vehicle seat and a seat belt. [Background technology]

[0002] 2. Description of the Related Art Vehicle seats are used that prevent the occupant's head from shifting position relative to the headrest and the occupant's clothing from being rolled up when the seat back is tilted backward.

[0003] For example, Patent Document 1 discloses a vehicle seat that includes a connecting link that rotatably connects the lower part of the seat back to the rear end of the seat cushion, and a parallel link that connects the seat cushion to the floor, and in which the rear end of the seat cushion is displaced upward and rearward when the seat back is tilted backward.

[0004] Furthermore, Patent Document 2 discloses a vehicle seat in which the seat back and seat cushion are connected by a link mechanism including an L-shaped link, and when the seat back is tilted backward, the seat cushion moves upward and forward. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-160217 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-246599 Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional vehicle seats do not take into consideration the occupant's support (restraint) by the lap belt when the seatback is tilted backward. In other words, the range of movement of the belt buckle or belt anchor is extremely limited, making it impossible to secure the belt in a way that follows the seatback tilt angle. In particular, if the lap belt position does not follow the seatback tilt angle, the lap belt cannot support the anterior superior iliac spine, which can make it difficult to adequately prevent the occupant's body from sliding forward in the seat during a vehicle collision, such as a frontal collision.

[0007] Therefore, an object of the present disclosure is to provide a vehicle seating device that can sufficiently support an occupant even when the seat back is tilted backward. [Means for solving the problem]

[0008] The vehicle seating device of the present disclosure is a vehicle seating device comprising a vehicle seat and a seat belt for restraining an occupant seated in the vehicle seat, wherein the vehicle seat comprises side frames for supporting a seat cushion, a seat back frame for supporting a seat back, and a reclining mechanism for tilting the seat back backward by a curved bracket integrally formed with the seat back frame moving in an arc relative to the side frame, and the seat belt has a belt buckle and a belt anchor connected to the bracket.

[0009] When the seat back is tilted backward, the positions of the seat belt buckle and belt anchor of the seat belt move according to the angle of inclination of the occupant's body, so the position of the seat belt relative to the occupant's body remains approximately constant, thereby providing sufficient support for the occupant even when the seat back is tilted backward.

[0010] In the vehicle seating device of the present disclosure, the reclining mechanism may include a curved rail attached to the side frame, and the bracket may move while being guided by the curved rail, causing the bracket to rotate around the center of curvature of the curved rail, and the curved rail may be attached to the side frame so that the center of curvature is located away from the side frame or the bracket.

[0011] This allows the center of rotation to be positioned close to the occupant's hip point while the reclining mechanism is positioned away from the center of rotation, thereby preventing the occupant sitting in the vehicle seat from coming into contact with the reclining mechanism. [Effects of the Invention]

[0012] The present disclosure can provide a vehicle seating device that can sufficiently support an occupant even when the seat back is tilted backward. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a left elevational view of a vehicle seating device according to an embodiment of the present invention; [Figure 2] 1 is a right elevational view of a vehicle seating device according to an embodiment of the present invention; [Figure 3] 2 is an elevational view showing a state in which the seat back of the vehicle seating device shown in FIG. 1 is tilted backward. FIG. [Figure 4] FIG. 10 is an elevation view showing a comparative example of a vehicle seating device with a seat back tilted backward. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, the vehicle seating device 100 of the embodiment will be described with reference to the drawings. Note that FR, UP, and RH shown in each drawing respectively indicate the front side, upper side, and right side of the vehicle seating device 100. Also, the opposite directions of FR, UP, and RH indicate the rear side, lower side, and left side. Hereinafter, when the directions of front-rear, left-right, and up-down are simply used in the description, they refer to the front-rear direction of the vehicle seating device 100, the left-right direction, and the up-down direction, unless otherwise specified.

[0015] As shown in FIGS. 1 and 2, the vehicle seating device 100 includes a vehicle seat 10 and a seat belt 40.

[0016] The vehicle seat 10 includes a seat cushion 11, a seat back 12, side frames 13, a seat back frame 14, and a reclining mechanism 20.

[0017] The side frames 13 are part of a seat cushion frame that supports the seat cushion 11. The side frames 13 are metal plate-shaped members that are arranged on the left and right ends of the vehicle seat 10 and extend in the front-to-rear direction. The left and right side frames 13 are connected to each other by a plurality of cross members (not shown), and are attached to the floor of the vehicle body (not shown) by front and rear legs 15, 16. The seat cushion 11 is attached on top of the left and right side frames 13. The seat cushion 11 has a seat surface 11S that supports the buttocks of a seated occupant 60.

[0018] The seatback frame 14 is a metal plate-like member that is disposed above and behind the left and right side frames 13 and extends in the vertical direction. The left and right seatback frames 14 are connected in the horizontal direction by connecting members (not shown). The left and right seatback frames 14 are connected to the left and right side frames 13 by a reclining mechanism 20. A seatback 12 is attached in front of the left and right seatback frames 14. The seatback 12 has a support surface 12S that supports the back of a seated occupant 60.

[0019] The reclining mechanism 20 includes a curved rail 21, a slider 22, a bracket 23, a rod 31, a worm gear case 32, a screw 33, and a motor 35. The reclining mechanism 20 tilts the seat back 12 backward around a rotation center C. Here, the rotation center C is located at a position away from the reclining mechanism 20 and close to a hip point 65, which is the center of rotation of the upper body of the occupant 60 when the seat back 12 tilts backward.

[0020] The curved rail 21 is an arc-shaped rail with a radius R attached to the side surface of the side frame 13 with a bolt 24. The slider 22 is guided by the curved rail 21 and is movable along the curved rail 21. The bracket 23 is a curved plate-like member with a lower portion curved in an arc and an upper portion extending upward. The upper portion of the bracket 23 is fixed to the side surface of the lower portion of the seatback frame 14 with a bolt 26. This makes the bracket 23 and the seatback frame 14 integrated. The lower portion of the bracket 23 is fixed to the slider 22 with a bolt 25. Therefore, when the slider 22 moves in an arc while being guided by the curved rail 21, the lower portion of the bracket 23 rotates relative to the side frame 13, and the seatback frame 14 rotates around a rotation center C. This causes the seat back 12 to tilt backward. Here, the rotation center C is the center of curvature of the curved rail 21. In this way, the curved rail 21 is attached to the side frame 13 so that the center of curvature is located away from the side frame 13 or the bracket 23 .

[0021] The rod 31 is a round bar member supported by the left and right side frames 13 and extending in the left-right direction. The left and right ends of the rod 31 penetrate the left and right side frames 13 and extend to the outside of the left and right side frames 13. The worm gear case 32 houses worm gears connected to both ends of the rod 31 and a screw 33. The worm gears engage with the screw 33 inside the worm gear case 32. The worm gear case 32 is attached to the outside of the side frames 13 so as to be rotatable around the rod 31. The rear end of the screw 33 is rotatably connected to the lower part of the bracket 23 by a fastening portion 34. A motor 35 is disposed between the left and right side frames 13 and drives the rod 31 to rotate.

[0022] The seat belt 40 includes a belt body 41, a belt buckle 42, and a belt anchor 44. In the case of a right-side seat, the belt buckle 42 is rotatably fastened to a fastening point 43 of the left bracket 23 of the vehicle seat 10. In the case of a right-side seat, the belt anchor 44 is rotatably fastened to a fastening point 45 of the right bracket 23 of the vehicle seat 10. In the case of a left-side seat, the arrangement of these components is reversed from that of the right-side seat.

[0023] As shown in FIGS. 1 and 2, when the seat back 12 is in the upright position, the seat belt 40 supports the anterior superior iliac spine of the occupant 60.

[0024] Next, the rearward tilting operation of the seat back 12 will be described with reference to FIG.

[0025] When the rod 31 is rotated by the motor 35, the worm gears connected to both ends of the rod 31 rotate, as shown by arrow 90 in FIG. 3. As a result, the screw 33 engaged with the worm gear moves forward relative to the side frame 13, as shown by arrow 91 in FIG. 3. Accordingly, the fastening portion 34 at the rear end of the screw 33 moves forward. When the fastening portion 34 moves forward, the slider 22 moves in an arc along the curved rail 21, as shown by arrow 92 in FIG. 3. As a result, the seat back 12 rotates around the rotation center C and tilts backward, as shown by arrow 93 in FIG. 3.

[0026] At this time, the fastening point 43 of the belt buckle 42 of the left bracket 23 moves forward in an arc together with the left bracket 23, as shown by arrow 94 in Figure 3. Similarly, the fastening point 45 of the belt anchor 44 of the right bracket 23 also moves forward in an arc together with the right bracket 23. This keeps the position of the belt main body 41 relative to the occupant 60 approximately constant. This allows the belt main body 41 to support the anterior superior iliac spine of the occupant 60 even when the seat back 12 is tilted backward. Therefore, the vehicle seating device 100 can adequately support the occupant 60 even when the seat back 12 is tilted backward.

[0027] Next, a comparative vehicle seating device 110 will be described with reference to Fig. 4. The vehicle seating device 110 includes a vehicle seat 10 and a seat belt 50. The seat belt 50 includes a belt body 51, a belt buckle 52, and a belt anchor (not shown). The belt buckle 52 is rotatably fastened to a fastening point 53 of the left side frame 13. The belt anchor is rotatably fastened to a fastening point (not shown) of the right side frame 13.

[0028] As shown in FIG. 4, in the vehicle seating device 110, the belt buckle 52 and the belt anchor are fastened to the left and right side frames 13, so the fastening point does not move as the seat back 12 tilts backward. On the other hand, when the seat back 12 tilts backward, the body of the occupant 60 also tilts backward. Therefore, when the seat back 12 tilts backward, the belt main body 51 moves below the abdomen of the occupant 60 and is unable to support the anterior superior iliac spine of the occupant 60. For this reason, in the vehicle seating device 110, when a frontal collision occurs with the seat back 12 tilted backward, there are cases where it is not possible to sufficiently suppress the submarine phenomenon, in which the body of the occupant 60 slides forward of the vehicle seat 10.

[0029] In contrast, in the vehicle seating device 100 of the embodiment, when the seat back 12 is tilted backward, the positions of the belt buckle 42 and the belt anchor 44 of the seat belt 40 move according to the tilt angle, so that the position of the belt main body 41 relative to the body of the occupant 60 is kept substantially constant. Therefore, the vehicle seating device 100 can support the anterior superior iliac spine of the occupant 60 even when the seat back 12 is tilted backward, and can sufficiently support the occupant 60.

[0030] Furthermore, the vehicle seating device 100 positions the rotation center C of the seat back 12 close to the hip point 65 of the occupant 60, so that when the seat back 12 is tilted backward, it is possible to prevent the occupant's 60 head from shifting position relative to the headrest and the occupant's 60 clothing from being rolled up.

[0031] Furthermore, in the vehicle seating device 100, the curved rail 21 is attached to the side frame 13 so that the center of curvature is located away from the side frame 13 or the bracket 23. This prevents the occupant 60 seated in the vehicle seat 10 from coming into contact with the reclining mechanism 20.

[0032] In the above description, the curved rail 21 is described as an arc-shaped rail, but is not limited to this. For example, the curved rail 21 may have a curved shape with multiple radii of curvature. In this case, the curved rail 21 has multiple centers of curvature, and multiple rotation centers C of the seat back 12 can be set. This allows for a highly flexible reclining operation.

[0033] Furthermore, in the above description, the bracket 23 is fixed to the seat back frame 14 by the bolt 26, but this is not limiting as long as it is provided integrally with the seat back frame 14. For example, a seat back frame assembly in which the seat back frame 14 and the bracket 23 are molded integrally may be used. Furthermore, in the above description, a worm gear is used as the gear, but naturally, other types of gears may also be used. [Explanation of symbols]

[0034] 10 vehicle seat, 11 seat cushion, 11S seat surface, 12 seat back, 12S support surface, 13 side frame, 14 seat back frame, 15, 16 legs, 20 reclining mechanism, 21 curved rail, 22 slider, 23 bracket, 24, 25, 26 bolt, 31 rod, 32 worm gear case, 33 screw, 34 fastening portion, 35 motor, 40, 50 seat belt, 41, 51 belt body, 42, 52 belt buckle, 43, 45 fastening point, 44 belt anchor, 60 occupant, 65 hip point, 100, 110 vehicle seating device, C rotation center.

Claims

1. A vehicle seat; a seat belt for restraining an occupant seated in the vehicle seat, The vehicle seat includes: A side frame that supports a seat cushion; a seat back frame supporting the seat back; a reclining mechanism in which a curved bracket integrally provided with the seat back frame moves in an arc relative to the side frame, thereby tilting the seat back backward; The seat belt has a belt buckle and a belt anchor connected to the bracket; A seating device for a vehicle, characterized by:

2. 2. The vehicle seating device according to claim 1, The reclining mechanism includes: A curved rail attached to the side frame, The bracket moves while being guided by the curved rail, and thereby the bracket rotates around the center of curvature of the curved rail; the curved rail is attached to the side frame so that the center of curvature is located at a position away from the side frame or the bracket; A seating device for a vehicle, characterized by:

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