Vehicle seat structure

Abstract

To provide a vehicle seat structure capable of enhancing stability of an upper body of an occupant during turning of a vehicle.SOLUTION: The vehicle seat structure has a seat back sub-frame linked to a seat back main frame by a plurality of wires so as to limit movement in a seat front-rear direction and to be movable in a roll direction. The wire includes a pair of upper-side support wires WU arranged on an upper side in a seat up-down direction and on both sides in a seat width direction to connect the seat back main frame and the seat back sub-frame, and inclined inward in the seat width direction from a seat rear side toward a seat front side; and a pair of lower-side support wires arranged on a lower side in the seat up-down direction and on both sides in the seat width direction to connect the seat back main frame and the seat back sub-frame in the seat front-rear direction, and inclined inward in the seat width direction from the seat rear side toward the seat front side.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat structure. [Background technology]

[0002] Patent Document 1 discloses a seat device including a main frame connected to a seat cushion via a reclining shaft, and a sub-frame that is capable of swinging in a roll direction relative to the main frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-112972 Summary of the Invention [Problem to be solved by the invention]

[0004] In the structure described in Patent Document 1, the subframe swings in response to the inertial force acting on the occupant while driving, thereby stabilizing the occupant's posture. However, there is room for improvement in terms of improving the stability of the occupant's upper body when cornering.

[0005] An object of the present invention is to provide a vehicle seat structure that can improve the stability of the upper body of an occupant when the vehicle is turning. [Means for solving the problem]

[0006] The vehicle seat structure according to claim 1 includes a seatback main frame connected to an end of the seat cushion on a rear side of the seat, and a seatback subframe connected to the seatback main frame by a plurality of wires so as to restrict movement of the seat in a front-rear direction and to be movable in a roll direction, the wires including a pair of upper support wires arranged on an upper side of the seat in a vertical direction and on both sides of the seat width direction, connecting the seatback main frame and the seatback subframe in the front-rear direction, and inclining inward in the seat width direction as they extend from the rear side of the seat to the front side of the seat, and a pair of lower support wires arranged on a lower side of the seat in a vertical direction and on both sides of the seat width direction, connecting the seatback main frame and the seatback subframe in the front-rear direction, and inclining inward in the seat width direction as they extend from the rear side of the seat to the front side of the seat.

[0007] In the vehicle seat structure according to claim 1, a seatback main frame is connected to the seat rear side of the seat cushion. A seatback subframe is connected to the seatback main frame by a plurality of wires. The seatback subframe is restricted in its movement in the front-rear direction relative to the seatback main frame and is movable in the roll direction. As a result, even if an inertial force is generated in the left-right direction on the occupant while the vehicle is traveling, the seatback subframe swings in the roll direction, thereby preventing the position of the occupant's head from moving significantly.

[0008] The wires include a pair of upper support wires and a pair of lower support wires. Each of the pair of upper support wires is disposed above the seat, connecting the seatback main frame and the seatback subframe in the seat fore-and-aft direction, and inclined inward in the seat width direction as it extends from the rear side of the seat to the front side of the seat. Each of the pair of lower support wires is disposed below the seat, connecting the seatback main frame and the seatback subframe in the seat fore-and-aft direction, and inclined inward in the seat width direction as it extends from the rear side of the seat to the front side of the seat. As a result, a line passing through the intersection of the extension lines of the pair of upper support wires and the extension line of the pair of lower support wires forms a virtual yaw axis of the seatback subframe, and the seatback subframe swings around this yaw axis. As a result, the upper body of the occupant can be directed inward during a turn, compared to a configuration in which the upper support wires and the lower support wires extend substantially parallel to each other.

[0009] The vehicle seat structure of claim 2 is the same as claim 1, in that a straight line connecting an upper intersection point where imaginary lines extending the pair of upper support wires toward the front of the seat intersect with a lower intersection point where imaginary lines extending the pair of lower support wires toward the front of the seat intersect passes through the steering wheel.

[0010] In the vehicle seat structure according to claim 2, the straight line connecting the upper intersection point and the lower intersection point is located at a position that passes through the steering wheel, so that the seatback subframe can be swung around an axis near the steering wheel for a driver holding the steering wheel.

[0011] A vehicle seat structure according to claim 3 is the vehicle seat structure according to claim 2, wherein the straight line extends vertically.

[0012] In the vehicle seat structure according to claim 3, the seatback subframe can be swung around a virtual yaw axis that extends vertically.

[0013] The vehicle seat structure of claim 4 is such that, in claim 1, the lower intersection point where imaginary lines extending the pair of lower support wires toward the front of the seat intersect is located on the front side of the seat and above the seat relative to the upper intersection point where imaginary lines extending the pair of upper support wires toward the front of the seat intersect.

[0014] In the vehicle seat structure according to claim 4, the line connecting the upper intersection point and the lower intersection point is inclined upward from the rear side of the seat to the front side of the seat, thereby allowing the seatback subframe to swing around the inclined line as a virtual yaw axis.

[0015] A vehicle seat structure according to claim 5 is the vehicle seat structure according to claim 4, wherein the straight line connecting the lower intersection point and the upper intersection point is located rearward of the seat relative to the steering wheel.

[0016] In the vehicle seat structure according to claim 5, the seatback subframe can be swung around an axis that is located rearward of the seat relative to the steering wheel, making it easier for the occupant's upper body to face inward when turning. [Effects of the Invention]

[0017] As described above, the vehicle seat structure according to the present invention can improve the stability of the upper body of an occupant when the vehicle is turning. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view showing a main part of a vehicle seat to which a vehicle seat structure according to an embodiment is applied; [Figure 2] FIG. 2 is an exploded perspective view showing a seat back main frame in the embodiment. [Figure 3] FIG. 2 is an exploded perspective view showing a seatback subframe in the embodiment. [Figure 4] FIG. 2 is a perspective view showing a state in which a seatback subframe is assembled in the embodiment. [Figure 5]FIG. 2 is a perspective view showing the extending direction of an upper support wire and a lower support wire in the embodiment. [Figure 6] FIG. 10 is a perspective view showing the extending direction of upper support wires and lower support wires in a modified example. [Figure 7] (A) is a time chart of the steering angle, (B) is a time chart of the left and right velocity of the chest, and (C) is a time chart of the angular velocity of the chest around the yaw axis. DETAILED DESCRIPTION OF THE INVENTION

[0019] A vehicle seat structure according to an embodiment will be described with reference to the drawings.

[0020] 1 is a perspective view showing a main part of a vehicle seat 10 to which a vehicle seat structure according to an embodiment is applied. Note that the arrows FR, UP, and LH in the figure respectively indicate the seat front direction, seat upper direction, and seat left direction of the vehicle seat 10. In the following description, when the front-rear, up-down, and left-right directions are used unless otherwise specified, they respectively refer to the front-rear direction in the seat front-rear direction, the up-down direction in the seat up-down direction, and the left-right direction in the seat width direction.

[0021] 1, a vehicle seat 10 of this embodiment includes a seat cushion 12 and a seat back 14. The seat cushion 12 extends in the front-rear direction and the width direction of the seat, and is configured to be able to support the buttocks and thighs of an occupant from below. The seat cushion 12 is fixed to a floor panel (not shown) via seat rails 16, and is configured to be able to move in the front-rear direction via the seat rails 16.

[0022] The rear end of the seat cushion 12 is connected to a seat back 14. The seat back 14 extends in the seat width direction and the seat up-down direction, and is configured to be able to support the back of the occupant from behind.

[0023] The seat back 14 is configured to include a seat back main frame 18 and a seat back subframe 20, and the seat back main frame 18 is rotatably connected to the end of the seat cushion 12 on the seat rear side via a support shaft 17. The seat back main frame 18 is configured to include a frame body 24 and a wire relay member 26, and the seat back subframe 20 is configured to include a support plate 28 and a support plate mounting member 30.

[0024] Fig. 2 is an exploded perspective view showing the seatback main frame 18 in the embodiment. As shown in Fig. 2, the frame body 24 constituting the seatback main frame 18 is formed in a substantially rectangular frame shape and includes an upper frame 24A, a lower frame 24B, and a pair of left and right side frames 24C.

[0025] The upper frame 24A is disposed at an upper portion of the frame main body 24 and extends in the seat width direction. The lower frame 24B is disposed at a lower portion of the frame main body 24 and extends in the seat width direction, through which the support shaft 17 is inserted. Each of the pair of left and right side frames 24C extends in the seat vertical direction and connects the right ends of the upper frame 24A and the lower frame 24B to the left ends of the upper frame 24A and the lower frame 24B.

[0026] The wire relay member 26 includes a pair of left and right side plates 32 and a relay pipe 36. The pair of left and right side plates 32 are each fixed by bolts or the like to the outside of a side frame 24C of the frame main body 24. An upper front bracket 33 protrudes from the vertical center of each side plate 32 toward the inside in the seat width direction, and a lower front bracket 34 protrudes from the lower end of each side plate 32 toward the inside in the seat width direction.

[0027] The relay pipe 36 is provided on the upper part of the side plate 32 and is a pipe-shaped member that protrudes from the side plate 32 toward the front of the seat. The relay pipe 36 has front-rear extending portions 36A that extend toward the front of the seat from a position slightly above the center of the pair of left and right side plates 32 in the up-down direction of the seat. The relay pipe 36 also includes a generally arch-shaped arch portion 36B that connects the front ends of the front-rear extending portions 36A, and a connecting portion 36C that connects the arch portion 36B to the upper end of the side plate 32 in the front-rear direction.

[0028] Here, a pulley 38 is provided in the center of the arch portion 36B of the relay pipe 36 in the seat width direction, and hooks 40 are provided at both ends of the arch portion 36B in the seat width direction. Note that in Fig. 2, only the hook 40 on the left side of the seat is shown, with the hook on the right side of the seat hidden. An upper wire W1, a right wire W2, and a left wire W3, which will be described later, are configured to be hung over the pulley 38 and the hooks 40 (see Fig. 4).

[0029] Fig. 3 is an exploded perspective view showing the seatback subframe 20 according to the embodiment. As shown in Fig. 3, the support plate 28 constituting the seatback subframe 20 includes a plate-shaped base plate 28A capable of supporting the back of an occupant, and both end portions of the base plate 28A in the seat width direction are curved toward the rear of the seat. In addition, a plurality of wire guides 28B are provided on the back surface of the base plate 28A, and in this embodiment, as an example, five wire guides 28B are provided in the vertical direction. Each of the wire guides 28B extends in the seat width direction and is formed in a shape that allows the lateral wires 50 of the support plate mounting member 30 to be inserted therein.

[0030] A disk member 42 is provided on the back surface of the upper part of the base plate 28A. The disk member 42 is formed in a substantially disk shape, and a through-hole 42A is formed in the upper part of the disk member 42. A pair of left and right protrusions 42B are also formed on the disk member 42. Furthermore, two upside-down, substantially V-shaped grooves 42C are formed in the lower part of the disk member 42. As shown in FIG. 4, the disk member 42 has the function of relaying the upper wire W1, the right wire W2, the left wire W3, and the lower wire W4. The upper wire W1, the right wire W2, the left wire W3, and the lower wire W4 will be described later.

[0031] As shown in FIG. 3, the support plate mounting member 30 includes a pair of left and right shaft portions 44, and an upper connecting portion 46 and a lower connecting portion 48 that are installed between the shaft portions 44. Each of the shaft portions 44 extends in the up-down direction of the seat and is disposed at both ends of the support plate 28 in the seat width direction. A plurality of lateral wires 50 are installed between the left and right shaft portions 44, and in this embodiment, five lateral wires 50 are installed vertically. Each of the five lateral wires 50 is inserted into a wire guide 28B, thereby supporting the base plate 28A. Furthermore, a hook 52 is provided at the upper end of the shaft portion 44.

[0032] The upper connecting portion 46 is formed in a generally U-shape in plan view with the front side of the seat open, and both ends of the upper connecting portion 46 are fixed to the shaft portion 44. A pair of left and right upper protrusions 46A protrude toward the front side of the seat from a portion of the upper connecting portion 46 extending in the seat width direction. Furthermore, an upper rear bracket 54 protrudes toward the rear side of the seat from outside the upper protrusions 46A in the seat width direction. The upper rear bracket 54 extends from the upper connecting portion 46 toward the rear side of the seat and is further bent toward the lower side of the seat, so that it is formed in a generally L-shape when viewed in the seat width direction.

[0033] The lower connecting portion 48 is disposed lower than the upper connecting portion 46 and is formed in a generally U-shape with an open front side of the seat in plan view. Both ends of the lower connecting portion 48 are fixed to the shaft portion 44. A pair of left and right lower protrusions 48A protrude toward the front side of the seat from a portion of the lower connecting portion 48 extending in the seat width direction. Furthermore, a lower rear bracket 56 protrudes toward the rear side of the seat from a position further outboard than the lower protrusions 48A in the seat width direction. The lower rear bracket 56 extends from the lower connecting portion 48 toward the rear side of the seat and is further bent toward the lower side of the seat, so that it is formed in a generally L-shape when viewed in the seat width direction.

[0034] Fig. 4 is a perspective view showing an assembled state of the seatback subframe 20 in the embodiment. Note that, for ease of explanation, some parts are omitted from Fig. 4. As shown in Fig. 4, an upper wire W1 is hung between the disk member 42 and the pulley 38 of the relay pipe 36. Specifically, a lower part of the upper wire W1 is passed through the through-hole 42A of the disk member 42, and an upper part of the upper wire W1 is wound around the pulley 38.

[0035] The right wire W2 is stretched between the protrusion 42B on the right side of the disc member 42, the hook 40 of the relay pipe 36, and the hook 52 of the shaft portion 44, so that when viewed from the front-to-rear direction of the seat, it is stretched in an approximately triangular shape with the protrusion 42B, the hook 40, and the hook 52 as vertices.

[0036] The left wire W3 is stretched between the protrusion 42B on the left side of the disc member 42, the hook 40 of the relay pipe 36, and the hook 52 of the shaft portion 44, so that when viewed from the front-to-rear direction of the seat, it is stretched in an approximately triangular shape with the protrusion 42B, the hook 40, and the hook 52 as vertices.

[0037] The lower wires W4 are permanently provided, and the upper lower wire W4 is fixed at one end to the right upper protruding piece 46A and the other end to the left upper protruding piece 46A via the upper groove 42C. The lower lower wire W4 is fixed at one end to the right lower protruding piece 48A and the other end to the left lower protruding piece 48A via the lower groove 42C. As described above, the seatback subframe 20 is suspended from the seatback main frame 18 by the upper wire W1, the right wire W2, the left wire W3, and the lower wire W4, and the seatback subframe 20 is movable relative to the seatback main frame 18.

[0038] Here, movement of the seatback subframe 20 in the seat fore-and-aft direction is limited by an upper support wire WU and a lower support wire WL. Specifically, the upper support wire WU connects the pair of left and right upper front brackets 33 and the pair of left and right upper rear brackets 54 in the seat fore-and-aft direction, and the front end of the upper support wire WU is fixed to the upper front bracket 33, and the rear end of the upper support wire WU is fixed to the upper rear bracket 54.

[0039] The lower support wire WL connects the pair of left and right lower front brackets 34 and the pair of left and right lower rear brackets 56 in the seat front-rear direction, and the front end of the lower support wire WL is fixed to the lower front bracket 34, and the rear end of the lower support wire WL is fixed to the lower rear bracket 56. In this way, the seatback subframe 20 is connected to the seatback main frame 18 so as to be limited in its movement in the seat front-rear direction and movable in the roll direction.

[0040] 5 is a perspective view showing the extending directions of the upper support wires WU and the lower support wires WL in the embodiment. In FIG. 5, the imaginary line extending from the upper support wires WU is indicated by VL1, and the imaginary line extending from the lower support wires WL is indicated by VL2.

[0041] 5, the upper support wire WU and the lower support wire WL are inclined inward in the seat width direction as they move from the rear side of the seat to the front side of the seat. Furthermore, the upper support wire WU is inclined downward in the seat as it moves from the rear side of the seat to the front side of the seat, and the lower support wire WL is inclined upward in the seat as it moves from the rear side of the seat to the front side of the seat. Therefore, when viewed from the seat width direction, an imaginary line VL1 extending the upper support wire WU toward the front side of the seat intersects with an imaginary line VL2 extending the lower support wire WL toward the front side of the seat.

[0042] Furthermore, a straight line VL3 connecting an upper intersection point P1, which is the intersection point of the pair of imaginary lines VL1, and a lower intersection point P2, which is the intersection point of the pair of imaginary lines VL2, passes through the steering wheel 100. In the present embodiment, as an example, the upper intersection point P1 and the lower intersection point P2 coincide with the seat front-rear direction and the seat width direction, and therefore the straight line VL3 extends vertically. The straight line VL3 serves as a virtual yaw axis of the seatback subframe 20. However, without being limited thereto, a configuration in which the upper intersection point P1 and the lower intersection point P2 are offset in the seat front-rear direction may also be employed. The configuration of this modified example will be described with reference to FIG. 6.

[0043] (Variation) Fig. 6 is a perspective view showing the extension directions of the upper support wire and the lower support wire in the modified example. As shown in Fig. 6, in this modified example, the upper support wire WU and the lower support wire WL are inclined inward in the seat width direction as they move from the rear side of the seat to the front side of the seat, as in the embodiment. Furthermore, the upper support wire WU is inclined downward in the seat as it moves from the rear side of the seat to the front side of the seat, and the lower support wire WL is inclined upward in the seat as it moves from the rear side of the seat to the front side of the seat. Therefore, when viewed from the seat width direction, an imaginary line VL1 extending the upper support wire WU toward the front side of the seat intersects with an imaginary line VL2 extending the lower support wire WL toward the front side of the seat.

[0044] In this modification, the lower intersection point P2, which is the intersection point of the pair of imaginary lines VL2, is located in front of and above the seat relative to the upper intersection point P1, which is the intersection point of the pair of imaginary lines VL1. Also, the straight line VL3 connecting the lower intersection point P2 and the upper intersection point P1 is located behind the steering wheel 100.

[0045] As described above, in this modified example, the straight line VL3 is inclined upward from the rear side of the seat to the front side of the seat, and this straight line VL3 serves as a virtual yaw axis of the seatback subframe 20.

[0046] (action) Next, the operation of the vehicle seat structure according to this embodiment and the modified example will be described.

[0047] In the vehicle seat structures according to the present embodiment and the modified examples, as shown in Fig. 1, a seatback main frame 18 is connected to the seat rear side of the seat cushion 12. Furthermore, as shown in Fig. 4, a seatback subframe 20 is connected to the seatback main frame 18 by a plurality of wires, and the seatback subframe 20 is restricted in movement in the front-rear direction relative to the seatback main frame 18 but is movable in the roll direction. As a result, even if an inertial force is generated on the occupant in the lateral direction while the vehicle is traveling, the seatback subframe 20 can swing in the roll direction, thereby preventing the position of the occupant's head from moving significantly.

[0048] The vehicle seat structure according to the present embodiment includes a pair of upper support wires WU and a pair of lower support wires WL. Each of the pair of upper support wires WU is disposed above the seat, connects the seatback main frame 18 and the seatback subframe 20 in the seat front-rear direction, and is inclined inward in the seat width direction as it extends from the rear side of the seat to the front side of the seat. Each of the pair of lower support wires WL is disposed below the seat, connects the seatback main frame 18 and the seatback subframe 20 in the seat front-rear direction, and is inclined inward in the seat width direction as it extends from the rear side of the seat to the front side of the seat. As a result, as shown in FIG. 5 , a straight line VL3 passing through an upper intersection point P1 on extension lines of the pair of upper support wires WU and a lower intersection point P2 on extension lines of the pair of lower support wires WL serves as a virtual yaw axis of the seatback subframe 20, and the seatback subframe 20 swings around this yaw axis. This allows the occupant's upper body to be directed inward when turning, compared to a configuration in which the upper support wire and the lower support wire extend approximately parallel, thereby improving the stability of the occupant's upper body when the vehicle turns.

[0049] In particular, in this embodiment, the straight line VL3 connecting the upper intersection point P1 and the lower intersection point P2 is located at a position that passes through the steering wheel 100, so that the seatback subframe 20 can be swung around an axis near the steering wheel 100 relative to the driver holding the steering wheel 100. In addition, the seatback subframe 20 can be swung around a virtual yaw axis that extends vertically.

[0050] On the other hand, in the structure of the modified example, as shown in Fig. 6, the line VL3 connecting the upper intersection point P1 and the lower intersection point P2 is inclined upward from the rear side of the seat to the front side of the seat. As a result, the inclined line VL3 serves as a virtual yaw axis, and the seatback subframe 20 can be swung around this yaw axis.

[0051] Furthermore, in the structure of the modified example, the seatback subframe 20 can be swung around an axis located rearward of the seat relative to the steering wheel 100, making it easier for the occupant's upper body to face inward when turning.

[0052] The effects of this embodiment and the modified example will be described with reference to the graph shown in Fig. 7. Fig. 7 is a graph showing the results of measuring the lateral velocity of the chest and the angular velocity around the yaw axis of an occupant seated in a vehicle seat when slalom driving with a lateral gravitational acceleration of about 0.2 G is simulated. Note that slalom driving can be reproduced by placing the vehicle seat on a platform test device capable of six-axis excitation and vibrating the test device using a predetermined program.

[0053] 7(A) to 7(C), the measurement results for the vehicle seat to which the vehicle seat structure of the comparative example is applied are indicated by dashed lines, the measurement results for the vehicle seat to which the vehicle seat structure of the embodiment is applied are indicated by dashed lines, and the measurement results for the vehicle seat to which the vehicle seat structure of the modified example is applied are indicated by solid lines. The vehicle seat of the comparative example has the same configuration as the embodiment except for the upper support wires and lower support wires, and the pair of upper support wires extend substantially parallel to each other. The pair of lower support wires also extend substantially parallel to each other. Therefore, in the comparative example, the pair of upper support wires do not intersect, and the pair of lower support wires do not intersect.

[0054] Figure 7(A) shows the steering angle over time, Figure 7(B) shows the left and right velocity of the occupant's chest at the same time, and Figure 7(C) shows the angular velocity of the occupant's chest around the yaw axis at the same time. As can be seen from Figure 7(A), the steering angle changes periodically over time because slalom driving is simulated.

[0055] 7(C), it can be seen that the angular velocity of the occupant's chest around the yaw axis is larger in the vehicle seat structure of the embodiment and the vehicle seat structure of the modified example than in the vehicle seat structure of the comparative example. From this result, it can be seen that the occupant's chest rotates around the yaw axis during slalom driving in the vehicle seat structure of the embodiment and the vehicle seat structure of the modified example. Furthermore, since it was confirmed that the occupant faces the inside of the turn during slalom driving, the vehicle seat structure of the embodiment and the vehicle seat structure of the modified example can orient the upper body of the occupant toward the inside of the turn, compared to the comparative example in which the upper support wires and the lower support wires extend substantially parallel to each other, thereby improving the stability of the occupant's upper body during vehicle turning.

[0056] 7(B), the left and right speed of the occupant's chest during slalom running is smaller in the vehicle seat structure of the modified example than in the vehicle seat structure of the embodiment. As a result, it can be seen that the left and right movement of the chest is converted into rotational movement in the vehicle seat structure of the modified example compared to the vehicle seat structure of the embodiment, and it can be confirmed that the occupant is more likely to face inward during a turn than in the vehicle seat structure of the embodiment.

[0057] The vehicle seat structure according to the embodiment and modified examples has been described above, but it goes without saying that it can be implemented in various ways without departing from the spirit of the present invention. For example, in the above embodiment and modified examples, the seat surface of the seat cushion 12 may be configured to be oscillating. As a structure for oscillating the seat surface of the seat cushion, for example, the structure disclosed in Japanese Patent Application Laid-Open No. 2021-24473 can be used. In this case, by setting the line VL3 connecting the lower intersection point P2 and the upper intersection point P1 of the vehicle seat structure according to the modified example shown in FIG. 6 so that it is perpendicular to the seat surface oscillation axis, the posture of the occupant can be most stabilized when the vehicle is turning.

[0058] 5, the imaginary line VL1 extending from the upper support wire WU toward the front of the seat and the imaginary line VL2 extending from the lower support wire WL toward the front of the seat intersect, but this is not limiting. For example, the imaginary line VL1 and the imaginary line VL2 may not intersect, and the upper intersection point P1 may be located above the lower intersection point P2.

[0059] The following notes are provided regarding the above embodiment.

[0060] (Appendix 1) a seat back main frame connected to an end of the seat cushion on the seat rear side; a seat back subframe connected to the seat back main frame by a plurality of wires so as to limit movement in a seat front-rear direction and to be movable in a roll direction; and The wires include a pair of upper support wires that are arranged on an upper side of the seat in the up-down direction and on both sides of the seat width direction, connect the seatback main frame and the seatback subframe in the seat front-rear direction, and are inclined inward in the seat width direction as they move from the rear side of the seat to the front side of the seat; and a pair of lower support wires that are arranged on a lower side of the seat in the up-down direction and on both sides of the seat width direction, connect the seatback main frame and the seatback subframe in the seat front-rear direction, and are inclined inward in the seat width direction as they move from the rear side of the seat to the front side of the seat. Vehicle seat structure. (Appendix 2) A vehicle seat structure as described in Appendix 1, wherein a straight line connecting an upper intersection point where imaginary lines extending the pair of upper support wires toward the front side of the seat intersect with a lower intersection point where imaginary lines extending the pair of lower support wires toward the front side of the seat intersect passes through the steering wheel. (Appendix 3) 3. The vehicle seat structure according to claim 2, wherein the straight line extends vertically. (Appendix 4) A vehicle seat structure as described in Appendix 1 or Appendix 2, wherein a lower intersection point where imaginary lines extending the pair of lower support wires toward the front side of the seat intersect is located on the front side of the seat and above the seat relative to an upper intersection point where imaginary lines extending the pair of upper support wires toward the front side of the seat intersect. (Appendix 5) 5. The vehicle seat structure according to claim 4, wherein the straight line connecting the lower intersection point and the upper intersection point is located rearward of the seat relative to the steering wheel. [Explanation of symbols]

[0061] 18 Seat back main frame 20 Seatback subframe 100 steering wheel P1 Upper intersection P2 Lower intersection VL1 Virtual Line VL2 Virtual Line WU Upper support wire WL Lower support wire

Claims

1. a seat back main frame connected to an end of the seat cushion on the seat rear side; a seat back subframe connected to the seat back main frame by a plurality of wires so as to limit movement in a seat front-rear direction and to be movable in a roll direction; and The wires include a pair of upper support wires that are arranged on an upper side of the seat in the up-down direction and on both sides of the seat width direction, connect the seatback main frame and the seatback subframe in the seat front-rear direction, and are inclined inward in the seat width direction as they move from the rear side of the seat to the front side of the seat; and a pair of lower support wires that are arranged on a lower side of the seat in the up-down direction and on both sides of the seat width direction, connect the seatback main frame and the seatback subframe in the seat front-rear direction, and are inclined inward in the seat width direction as they move from the rear side of the seat to the front side of the seat. Vehicle seat structure.

2. 2. The vehicle seat structure according to claim 1, wherein a straight line connecting an upper intersection point where imaginary lines extending the pair of upper support wires toward the front side of the seat intersect with a lower intersection point where imaginary lines extending the pair of lower support wires toward the front side of the seat intersect passes through the steering wheel.

3. The vehicle seat structure according to claim 2 , wherein the straight line extends vertically.

4. 2. The vehicle seat structure according to claim 1, wherein a lower intersection point where imaginary lines extending the pair of lower support wires toward the front side of the seat intersect is located on the front side of the seat and above the seat relative to an upper intersection point where imaginary lines extending the pair of upper support wires toward the front side of the seat intersect.

5. 5. The vehicle seat structure according to claim 4, wherein the straight line connecting the lower intersection point and the upper intersection point is located rearward of the seat relative to a steering wheel.

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