Seating device for vehicle

Abstract

The present invention provides a vehicle seating device capable of sufficiently supporting an occupant even in a state in which a seat back is tilted backwards. A vehicle seating device (100) is provided with a vehicle seat (10) and a seatbelt (40), the vehicle seat (10) is provided with a side frame (13), a seatback frame (14), and a tilt adjustment mechanism (20) that tilts a seatback (12) backwards, and a seatbelt buckle (42) and a seatbelt anchor (44) of the seatbelt (40) are connected to a bracket (23).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a structure of a vehicle seating device provided with a vehicle seat and a seat belt. BACKGROUND

[0002] Currently, a vehicle seat is used, which suppresses a shift in the position of the head of an occupant with respect to a headrest and a roll-up of the clothes of the occupant when the seatback is reclined.

[0003] For example, in Patent Literature 1, a vehicle seat is disclosed, which is provided with a link link rod that rotatably links a lower portion of a seatback and a rear end portion of a seat cushion, and a parallel link rod that links the seat cushion and a floor, and in which the rear end portion of the seat cushion is displaced upward and rearward when the seatback is reclined.

[0004] Further, in Patent Literature 2, a vehicle seat is disclosed, in which a seatback and a seat cushion are linked together by a link mechanism including an L-shaped link rod, and in which the seat cushion is moved upward and forward when the seatback is reclined.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2006-160217

[0008] Patent Literature 2: Japanese Patent Application Publication No. 2010-246599 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] Further, in the vehicle seat of the related art, occupant support (restraint) by a lap belt when the seatback is reclined is not taken into consideration. That is, since the movable range of the setting position of the belt buckle or the belt anchor is extremely small, belt fixation following the reclining angle of the seatback cannot be achieved. In particular, in the case where the lap belt position does not follow the reclining angle of the seatback, the iliac anterior superior spine is sometimes not supported by the lap belt, and thus the diving phenomenon in which the body of the occupant slides forward of the seat when a vehicle collision, such as a front collision (head-on collision), occurs cannot be sufficiently suppressed.

[0011] Therefore, an object of the present disclosure is to provide a vehicle seating device that can sufficiently support an occupant even in a state where the seatback is reclined.

[0012] METHOD FOR SOLVING THE PROBLEMS

[0013] The vehicle seating device of the present disclosure is characterized in that the vehicle seat includes a side frame that supports a seat cushion, a seatback frame that supports a seatback, and a reclining adjustment mechanism that causes the seatback to recline by moving an arcuately shaped bracket that is provided integrally with the seatback frame with respect to the side frame, and a seatbelt buckle and a seatbelt anchor of a seatbelt that restrains an occupant seated on the vehicle seat are linked to the bracket.

[0014] When the seatback is caused to recline, the position of the seatbelt buckle and the seatbelt anchor of the seatbelt moves in correspondence with the inclination angle of the body of the occupant, so the position of the seatbelt with respect to the body of the occupant is maintained substantially constant. Therefore, the occupant can be sufficiently supported even in a state in which the seatback is caused to recline.

[0015] In the vehicle seating device of the present disclosure, the reclining adjustment mechanism includes a curved guide rail that is installed on the side frame, and the bracket is caused to move by being guided by the curved guide rail, so the bracket is caused to move in rotation around a center of curvature of the curved guide rail, and the curved guide rail is installed on the side frame in such a manner that the center of curvature is positioned apart from the side frame or the bracket.

[0016] Thus, it is possible to position the reclining adjustment mechanism at a position apart from the center of rotation while setting the center of rotation at a position close to the hip point of the occupant. Thus, it is possible to suppress the occupant seated on the vehicle seat from coming into contact with the reclining adjustment mechanism.

[0017] Effects of Invention

[0018] The present disclosure can provide a vehicle seating device that can sufficiently support an occupant even in a state in which a seatback is caused to recline. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A front view of the vehicle seating device of the embodiment, as viewed from the left.

[0020] Figure 2 A front view of the vehicle seating device of the embodiment, as viewed from the right.

[0021] Figure 3 A front view showing Figure 1 a state in which the seatback of the vehicle seating device shown is caused to recline.

[0022] Figure 4 An elevation view showing the seat back of a vehicle seating device in a scaled-up configuration, with the seat back reclined. Detailed Implementation

[0023] The vehicle seating device 100 of the following embodiment will be described with reference to the accompanying drawings. In each figure, FR, UP, and RH represent the front, upper, and right sides of the vehicle seating device 100, respectively. Furthermore, the opposite directions of FR, UP, and RH represent the rear, lower, and left sides, respectively. Hereinafter, only the front-back, left-right, and up-down directions will be used in the description; unless otherwise specified, these directions refer to the front-back direction, left-right direction, and up-down direction of the vehicle seating device 100.

[0024] like Figure 1 , 2 As shown, the vehicle seating device 100 includes a vehicle seat 10 and a seat belt 40.

[0025] The vehicle seat 10 includes a seat cushion 11, a seat back 12, a side frame 13, a seat back frame 14, and a tilt adjustment mechanism 20.

[0026] The side frame 13 is part of the seat cushion frame that supports the seat cushion 11. The side frame 13 is a metal plate-like component disposed at the left and right ends of the vehicle seat 10 and extending in the front-rear direction. The left and right side frames 13 are connected together by a plurality of transverse members (not shown) and are mounted on the vehicle floor (not shown) by the front and rear footrests 15 and 16. The seat cushion 11 is mounted on the left and right side frames 13. The seat cushion 11 has a seat surface 11S that supports the buttocks of the seated occupant 60.

[0027] The seat back frame 14 is a metal plate-like component located on the upper rear side of the left and right side frames 13 and extending in the vertical direction. The left and right seat back frames 14 are connected together in the left-right direction by a connecting member (not shown). The left and right seat back frames 14 are connected to the left and right side frames 13 by a tilt adjustment mechanism 20. A seat back 12 is installed at the front of the left and right seat back frames 14. The seat back 12 has a support surface 12S for supporting the back of the seated occupant 60.

[0028] The tilt adjustment mechanism 20 includes a curved guide rail 21, a slider 22, a bracket 23, a rod 31, a worm gear box 32, a screw 33, and a motor 35. The tilt adjustment mechanism 20 causes the seat back 12 to tilt backward about a rotation center C. Here, the rotation center C is a position separated from the tilt adjustment mechanism 20 and is a position close to the hip point 65, which is the rotation center of the upper body of the occupant 60 when the seat back 12 is tilted backward.

[0029] The curved guide rail 21 is a rail of a circular arc shape of radius R installed on the side surface of the side frame 13 with the bolt 24. The slider 22 is guided by the curved guide rail 21 and is movable along the curved guide rail 21. The bracket 23 is a plate-like member of a curved shape in which the lower portion is curved in a circular arc shape and the upper portion extends toward the upward direction. The upper portion of the bracket 23 is fixed to the side surface of the lower portion of the seat back frame 14 with the bolt 26. Thus, the bracket 23 is integrated with the seat back frame 14. Further, the lower portion of the bracket 23 is fixed to the slider 22 with the bolt 25. Therefore, when the slider 22 is guided by the curved guide rail 21 and moves in a circular arc shape, the lower portion of the bracket 23 rotates relative to the side frame 13, thereby rotating the seat back frame 14 around the center of rotation C. Thus, the seat back 12 is reclined. Here, the center of rotation C is the center of curvature of the curved guide rail 21. In this way, the curved guide rail 21 is installed on the side frame 13 in such a manner that the center of curvature is at a position separated from the side frame 13 or the bracket 23.

[0030] The rod 31 is a round bar member supported on the left and right side frames 13 and extending in the left and right directions. The left and right end portions 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 box 32 houses a worm gear and a screw rod 33 connected to both ends of the rod 31. The worm gear is engaged with the screw rod 33 inside the worm gear box 32. The worm gear box 32 is installed on the outside of the side frame 13 in such a manner as to be rotatable around the rod 31. The rear end of the screw rod 33 is connected at the lower portion of the bracket 23 via the joint 34 in a rotatable manner. The motor 35 is disposed between the left and right side frames 13 and rotates the rod 31.

[0031] The seat belt 40 includes a seat belt main body 41, a seat belt buckle 42, and a seat belt anchor 44. In the case of the right side seat, the seat belt buckle 42 is coupled to the joint 43 of the bracket 23 on the left side of the vehicle seat 10 in a rotatable manner. Further, in the case of the right side seat, the seat belt anchor 44 is coupled to the joint 45 of the bracket 23 on the right side of the vehicle seat 10 in a rotatable manner. Further, in the case of the left side seat, these configurations are reversed from the right side seat.

[0032] As shown in Figure 1 , 2 , in the state where the seat back 12 is erected, the seat belt 40 supports the anterior superior iliac spine of the occupant 60.

[0033] Next, the operation of reclining the seat back 12 will be described while referring to Figure 3 .

[0034] When the rod 31 is rotated by the motor 35, such as Figure 3 As indicated by arrow mark 90, the worm gears connected to both ends of rod 31 rotate. Thus, as... Figure 3 As indicated by arrow 91, the screw 33, which engages with the worm gear, moves forward relative to the side frame 13. Simultaneously, the engagement portion 34 at the rear end of the screw 33 moves forward. As the engagement portion 34 moves forward, as... Figure 3 As indicated by arrow mark 92, slider 22 moves in an arc along curved guide rail 21. Thus, as... Figure 3 As indicated by arrow 93, the seat back 12 rotates around the rotation center C and thus tilts backward.

[0035] At this time, the engagement point 43 of the safety belt buckle 42 of the left bracket 23 is as follows: Figure 3 As indicated by arrow 94, the seatbelt body 41 moves forward in an arc shape along with the left support 23. Similarly, the engagement point 45 of the seatbelt anchor 44 of the right support 23 also moves forward in an arc shape along with the right support 23. Thus, the position of the seatbelt body 41 relative to the occupant 60 is kept approximately constant. Therefore, even when the seat back 12 is reclined, the seatbelt body 41 can still support the anterior superior iliac spine of the occupant 60. Therefore, the vehicle seating device 100 can adequately support the occupant 60 even when the seat back 12 is reclined.

[0036] Next, in reference Figure 4 Simultaneously, a comparative example of a vehicle seating device 110 will be described. The vehicle seating device 110 includes a vehicle seat 10 and a seatbelt 50. The seatbelt 50 includes a seatbelt body 51, a seatbelt buckle 52, and a seatbelt anchor (not shown). The seatbelt buckle 52 is rotatably engaged with a connection point 53 on the left side frame 13. Furthermore, the seatbelt anchor is rotatably engaged with a connection point (not shown) on the right side frame 13.

[0037] like Figure 4As shown, in the vehicle seating device 110, since the seat belt buckle 52 and the seat belt anchor are combined with the left and right side frames 13, the combined points do not move with the reclining of the seat back 12. On the other hand, when the seat back 12 is reclined, the body of the occupant 60 is also reclined. Therefore, when the seat back 12 is reclined, the seat belt main body 51 moves to the lower side of the abdomen of the occupant 60, and thus becomes unable to support the anterior superior iliac spine of the occupant 60. Therefore, in the vehicle seating device 110, when a frontal collision occurs in a state where the seat back 12 is reclined, the diving phenomenon in which the body of the occupant 60 slides to the front of the vehicle seat 10 can not be sufficiently suppressed.

[0038] In contrast, in the vehicle seating device 100 of the embodiment, since the positions of the seat belt buckle 42 and the seat belt anchor 44 of the seat belt 40 move in accordance with the inclination angle when the seat back 12 is reclined, the position of the seat belt main body 41 with respect 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 in a state where the seat back 12 is reclined, and thus can sufficiently support the occupant 60.

[0039] Further, since the vehicle seating device 100 sets the rotation center C of the seat back 12 to a position close to the hip point 65 of the occupant 60, when the seat back 12 is reclined, the position offset of the head of the occupant 60 with respect to the headrest and the rolling up of the clothes of the occupant 60 can be suppressed.

[0040] Further, in the vehicle seating device 100, the curved guide rail 21 is installed on the side frame 13 in such a manner that the center of curvature is a position separated from the side frame 13 or the bracket 23. Thereby, it is possible to suppress the case where the occupant 60 seated on the vehicle seat 10 comes into contact with the inclination adjustment mechanism 20.

[0041] Although in the above description, the curved guide rail 21 is described as a guide rail in a circular arc shape, it is not limited thereto. For example, the curved guide rail 21 can be provided in a curved shape having a plurality of radii of curvature. In this case, the curved guide rail 21 has a plurality of centers of curvature, and thus it is possible to set a plurality of rotation centers C of the seat back 12. Thereby, it is possible to perform a reclining adjustment operation with high degrees of freedom.

[0042] Further, although the above description has been made of the case where the bracket 23 is fixed to the seat back frame 14 by the bolts 26, it is not limited thereto as long as the seat back frame 14 is integrally provided. For example, a seat back frame assembly in which the seat back frame 14 and the bracket 23 are formed in one piece can be used. Further, although the worm gear has been used as the gear in the above description, other kinds of gears can of course be used.

[0043] Symbol explanation

[0044] 10 … vehicle seat; 11 … seat cushion; 11S … seat surface; 12 … seat back; 12S … support surface; 13 … side frame; 14 … seat back frame; 15, 16 … leg; 20 … reclining adjustment mechanism; 21 … curved rail; 22 … slider; 23 … bracket; 24, 25, 26 … bolt; 31 … rod; 32 … worm gear housing; 33 … screw rod; 34 … joint; 35 … motor; 40, 50 … seat belt; 41, 51 … belt body; 42, 52 … belt buckle; 43, 45 … joint point; 44 … belt anchor; 60 … occupant; 65 … hip point; 100, 110 … vehicle seating device; C … center of rotation.

Claims

1. A seating device for a vehicle, comprising: Vehicle seats; Seat belts are used to restrain occupants seated in the seats of the vehicle. The vehicle seating device is characterized in that... The vehicle seat has the following features: Side frames that support the seat cushion; The seat back frame supports the seat back. The tilt adjustment mechanism tilts the seat back by moving a curved bracket integrally formed with the seat back frame in an arc relative to the side frame. The seat belt buckle and seat belt anchor are connected to the bracket.

2. The vehicle seating device as described in claim 1, characterized in that, The tilt adjustment mechanism has a curved guide rail mounted on the side frame. By guiding the support along the curved guide rail, the support rotates about the center of curvature of the curved guide rail. The curved guide rail is mounted on the side frame in such a way that the center of curvature is separated from the side frame or the bracket.

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