Vehicle seats

Abstract

To provide a vehicle seat in which a locking mechanism is provided only on one of the left and right side hinge parts, and which can suppress the deformation of a seat back when a large load is input to the seat front side in an upright position. [Solution] A second shaft portion 92 of a second side hinge portion 90 is fixed to the vehicle body and has an axial direction that is the seat width direction. A second pivoting portion 94 of the second side hinge portion 90 is provided rotatably about a pivot central axis 63 of the seat back, and a second arc-shaped hole 96 is formed in this second pivoting portion 94, with the center of the arc being the center of the pivot central axis 63, and the second shaft portion 92 is inserted into the second arc-shaped hole 96. A notch 98 is formed in the second pivoting portion 94, cut out from a part of the second arc-shaped hole 96, so that the second shaft portion 92 can enter and abut when a load of a predetermined value or more is input toward the front side of the seat to the seat back 14 in an upright position.

Description

[Technical Field]

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

[0002] Patent Document 1 listed below discloses a vehicle seat that is a bench-seat type rear seat and has a seat back that can be rotated between an upright position and a forward-folded position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-131662 Summary of the Invention [Problem to be solved by the invention]

[0004] In a vehicle seat having the above-described configuration, for example, the left and right side hinge portions may rotatably connect the lower end portions of the left and right sides of the seat back to the vehicle body, and a locking mechanism that restricts the rotation of the seat back may be provided on only one of the left and right side hinge portions.

[0005] However, with this configuration, when a large load is input to the front of the seat with the seat back in an upright position during a collision or sudden braking, the seat back may be allowed to rotate on the side of the side hinge where no locking mechanism is provided, which could result in a large amount of deformation of the seat back, and there is room for improvement in this regard.

[0006] Taking the above facts into consideration, the present invention aims to provide a vehicle seat that is configured so that a locking mechanism is provided only on one of the left and right side hinge portions, and that is capable of suppressing the amount of deformation of the seat back when a large load is input toward the front of the seat when the seat back is in an upright position. [Means for solving the problem]

[0007] A vehicle seat of a first aspect is a vehicle seat that is at least one of a rear seat and a bench seat and has a seat back that can be folded forward from an upright position, and includes a first side hinge portion that rotatably connects a lower end portion of one of the left and right sides of the seat back to a vehicle body, a second side hinge portion that rotatably connects a lower end portion of the other of the left and right sides of the seat back to the vehicle body, and a locking mechanism that is provided only on the first side hinge portion and can lock the seat back in the upright position. The second side hinge portion comprises an axis portion fixed to the vehicle body side and having an axial direction in the seat width direction, and a rotating portion that is rotatable around the rotation center axis of the seat back, in which an arc hole is formed with the center of the rotation center axis as the arc center and through which the axis portion is inserted, and a notch portion cut out from a part of the arc hole is formed in the rotating portion so that the axis portion can enter and abut when a load of a predetermined value or more is input toward the front side of the seat to the seat back in the upright position.

[0008] According to a first aspect of the vehicle seat, the vehicle seat is at least one of a rear seat and a bench seat, and the seatback can be tilted forward from an upright position. One of the left and right side portions and the lower end of the seatback is rotatably connected to the vehicle body by a first side hinge portion, and the other of the left and right side portions and the lower end of the seatback is rotatably connected to the vehicle body by a second side hinge portion. A locking mechanism provided only in the first side hinge portion can lock the seatback in an upright position. Meanwhile, the second side hinge portion has a shaft portion and a rotating portion. The shaft portion of the second side hinge portion is fixed to the vehicle body and has an axial direction aligned with the seat width direction. The rotating portion of the second side hinge portion is rotatable around the rotation center axis of the seatback, and the rotating portion of the second side hinge portion has an arc hole formed therein with the center of the rotation center axis as the arc center, and the shaft portion is inserted through this arc hole. As a result, when the seat back is tilted forward from the upright position, the shaft portion moves relatively within the arc hole, so that the rotating portion of the second side hinge portion rotates stably.

[0009] Here, the rotating part has a notch cut out from a part of the arc hole so that the shaft enters and abuts when a load of a predetermined value or more is input toward the front of the seat with the seat back in the upright position. Therefore, when a large load is input toward the front of the seat with the seat back in the upright position, the shaft enters and abuts the notch, thereby suppressing rotation of the rotating part on the second side hinge side, and thereby suppressing the amount of deformation of the seat back.

[0010] The vehicle seat of the second aspect is the same as that of the first aspect, except that the edge of the cutout portion includes a vertical edge portion that is arranged along the up-down direction of the seat when the seat back is in the upright position.

[0011] According to the second aspect of the vehicle seat, the vertical edge portion, which is part of the edge of the cutout portion, is arranged to follow the up-down direction of the seat when the seat back is in the upright position. Therefore, when a large load is input to the seat back in the upright position toward the front of the seat and the axle enters the cutout portion, the axle abuts against the vertical edge portion, and the vertical edge portion can stably bear the load (reaction force) from the axle.

[0012] The vehicle seat of the third aspect is the first or second aspect, wherein the edge of the arc hole includes a rear adjacent edge portion that is positioned adjacent to the rear side of the seat relative to at least a portion of the axis portion in a side view of the seat when the seat back is in the upright position.

[0013] According to the third aspect of the vehicle seat, when the seat back is in the upright position, the rear adjacent edge, which is part of the edge of the arc hole, is disposed adjacent to at least a part of the axle on the rear side of the seat in a side view of the seat. Therefore, even if the axle tries to move toward the rear of the seat relative to the pivoting part when the seat back is in the upright position, the axle can be received by the rear adjacent edge. Therefore, when the seat back is in the upright position and in normal operation, rattling of the pivoting part can be suppressed, and therefore rattling of the other of the left and right sides of the seat back can be suppressed.

[0014] A fourth aspect of the vehicle seat is the third aspect, wherein a portion of the cutout portion is positioned rearward of a portion of the shaft portion in a side view of the seat when the seat back is in the upright position.

[0015] According to the fourth aspect of the vehicle seat, a portion of the cutout is located rearward of a portion of the axis when viewed from the side of the seat when the seat back is in an upright position. Therefore, when the seat back is in an upright position and under normal circumstances, rattling of the pivoting portion is suppressed by the rear adjacent edge portion, and when a large load is input toward the front of the seat to the seat back in an upright position, the amount of displacement of the pivoting portion can be suppressed while allowing the axis to enter the cutout. [Effects of the Invention]

[0016] As described above, the vehicle seat according to the present invention has a configuration in which a locking mechanism is provided in only one of the left and right side hinge portions, which has the excellent effect of being able to suppress the amount of deformation of the seat back when a large load is input toward the front of the seat to the seat back in an upright position. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a seat frame and the like of a vehicle seat according to an embodiment of the present invention. [Figure 2] 10 is a side view showing the first side hinge portion in a normal state when the seat back is in an upright position, as viewed from the inside in the seat width direction. FIG. [Figure 3] 10 is a side view showing the second side hinge portion in a normal state when the seat back is in an upright position, as viewed from the inside in the seat width direction. FIG. [Figure 4] FIG. 4 is a side view showing a part of the side lower frame alone of FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0018] A vehicle seat 10 according to one embodiment of the present invention will be described below with reference to Figures 1 to 4. Note that in each figure, some reference numerals may be omitted to make the drawings easier to understand. Furthermore, arrows FR, LH, and UP, which are appropriately shown in each figure, indicate the front, left, and top of the vehicle seat 10, respectively.

[0019] (Configuration of the embodiment) Fig. 1 shows a perspective view of a seat frame 20 and other components of a vehicle seat 10 according to one embodiment. In Fig. 1, the outline of the vehicle seat 10 is simplified and shown by a two-dot chain line. The vehicle seat 10 is a rear seat located in the rear row of a vehicle, and is a bench seat for two people.

[0020] As shown in Fig. 1, a vehicle seat 10 includes a seat cushion 12 on which a vehicle occupant sits, and a seat back 14 that supports the occupant's back. The seat cushion 12 has a seat cushion pad (not shown) supported by a seat cushion frame 22, and the seat cushion pad is covered with an upholstery. The seat back 14 has a seat back pad (not shown) supported by a seat back frame 32, and the seat back pad is covered with an upholstery. The seat cushion frame 22 and the seat back frame 32 each constitute a part of a seat frame 20.

[0021] The seat cushion frame 22 has a pair of left and right side frames 24, 25, a front pipe 26 connecting the left and right side frames 24, 25 and arranged in a portion including the front part of the seat cushion 12, and a rear pipe 28 connecting the left and right side frames 24, 25 and arranged in a portion on the rear end side of the seat cushion 12.

[0022] The side frames 24, 25 are made of metal plate material, form part of the sides of the seat cushion frame 22, and extend in the front-to-rear direction of the seat. The rear portions of the side frames 24, 25 are bent diagonally upward and rearward of the seat. The front pipe 26 is made of metal pipe material bent into a U-shape, and is arranged so that the open side of the U-shape is toward the rear of the seat in a plan view. A widthwise extending portion 26A of the front pipe 26, which extends in the seat width direction, is arranged on the front end side of the seat cushion 12. The rear pipe 28 is made of metal pipe material bent into a crank shape on both sides, and is arranged so that the middle portion in the seat width direction is closer to the rear of the seat than the left and right ends in a plan view.

[0023] The seatback frame 32 has a pair of left and right side lower frames 34, 35, an upper pipe 36 connecting the left and right side lower frames 34, 35 and positioned in a portion including the upper part of the seatback 14, and a lower pipe 38 connecting the left and right side lower frames 34, 35 and positioned in the lower part of the seatback 14.

[0024] The side lower frames 34, 35 are made of metal plate material, form the lower portions of the sides of the seatback frame 32, and extend in the vertical direction of the seat. The upper pipe 36 is made of metal pipe material bent into a U-shape, and is positioned so that the open side of the U-shape is toward the lower side of the seat in a front view, with its lower end joined to the side lower frames 34, 35. The lower pipe 38 is made of metal pipe material, extends in the seat width direction, and has its longitudinal end joined to the side lower frames 34, 35.

[0025] Additionally, the upper portions of the side lower frames 34, 35 of the seatback frame 32 and the rear ends of the side frames 24, 25 of the seat cushion frame 22 are connected by connecting shafts 52, 53 to be relatively rotatable about axes in the seat width direction. The lower portions of the side lower frames 34, 35 of the seatback frame 32 are located below the side frames 24, 25 of the seat cushion frame 22 when the seatback 14 is in an upright position.

[0026] Below the seat cushion 12, a pair of left and right front base members 42, 43 are provided on the front side of the seat in the front-rear direction and attached to the vehicle body floor F, and a pair of left and right rear base members 44, 45 are provided on the rear side of the seat in the front-rear direction and attached to the vehicle body floor F. The pair of front base members 42, 43 are made of metal plate material, and each has a shape in which both left and right sides are bent toward the upper side of the seat. The pair of rear base members 44, 45 are also made of metal plate material, and are bent into an L shape as a whole, and are arranged so that lower end portions 44A, 45A joined to the vehicle body floor F approach each other.

[0027] The lower portions of the side lower frames 34, 35 of the seat back frame 32 are connected to the upper portions of the vertical wall portions 44B, 45B of the rear base members 44, 45 so as to be rotatable about axes in the seat width direction via rotation center shafts 62, 63. The rotation center shafts 62 and 63 are arranged on the same straight line.

[0028] Meanwhile, leg attachment portions 54, 55 are joined to the lower surface of both the left and right sides of the widthwise extending portion 26A of the front pipe 26. Longitudinal ends of elongated legs 56, 57 are attached to the leg attachment portions 54, 55 by connecting shafts S1, S2 so as to be relatively rotatable about axes in the seat width direction. The other longitudinal ends of the legs 56, 57 are attached to the front base members 42, 43 by connecting shafts S3, S4 so as to be relatively rotatable about axes in the seat width direction.

[0029] As described above, the seat cushion 12 having the seat cushion frame 22 can be tilted down. Also, the seat back 14 having the seat back frame 32 can be tilted forward from an upright position (the position shown in FIG. 1).

[0030] The vehicle seat 10 has a first side hinge portion 70 that rotatably connects the left side (one of the left and right sides) of the seat back 14 in the left-right direction of the seat and the lower end side to the vehicle body, a second side hinge portion 90 that rotatably connects the right side (the other of the left and right sides) of the seat back 14 in the left-right direction of the seat to the vehicle body, and a locking mechanism 80 that is provided only on the first side hinge portion 70 and can lock the seat back 14 in an upright position.

[0031] FIG. 2 shows a side view of the first side hinge portion 70 as viewed from the inside in the seat width direction in a normal state when the seat back 14 (see FIG. 1; hereinafter, reference figure numbers will be omitted as appropriate) is in an upright position. As shown in FIGS. 1 and 2, the first side hinge portion 70 includes a first shaft portion 72 that penetrates the vertical wall portion 44B of the rear base member 44 and has an axial direction that is the seat width direction. As shown in FIG. 1, the first shaft portion 72 is fixed to the vehicle floor F (vehicle body side) via the rear base member 44. As shown in FIG. 2, the first side hinge portion 70 includes a first rotation portion 74 that is rotatable about a rotation center shaft 62 of the seat back 14, and the rotation center shaft 62 penetrates a portion of the first rotation portion 74. In this embodiment, the first rotation portion 74 is formed by a lower portion of the side lower frame 34 of the seat back 14.

[0032] A first arc hole 76 having an arc center at the center (axial center) of the rotation central shaft 62 is formed in the first rotation portion 74, and the first shaft portion 72 is inserted into this first arc hole 76. The first arc hole 76 is set at a position including the front side and the upper side of the seat with respect to the rotation central shaft 62 when the seat back 14 is in the upright position.

[0033] A locking through-portion 82 is formed through the first pivoting portion 74, contiguous with the first arc-shaped hole 76. The locking through-portion 82 is formed from the lower end side of the first arc-shaped hole 76 toward the front side of the seat. The locking through-portion 82 is configured so that the first shaft portion 72 can enter when the seat back 14 is in the upright position, and when the first shaft portion 72 enters the locking through-portion 82, the rotation of the side lower frame 34 is locked.

[0034] The first shaft 72 passes through one end (upper end) of a lever 84. The lever 84 is disposed on a surface of the vertical wall 44B of the rear base member 44 facing outward in the seat width direction, and is rotatable around a shaft 85 provided on the vertical wall 44B and having an axial direction in the seat width direction. One end of a spring 86 is engaged with a rear portion 84B on the other end (lower end) side of the lever 84, and the other end of the spring 86 is engaged with an engaging hole 44H of the vertical wall 44B. The lever 84 is biased (pulled) by the spring 86 so as to position the first shaft 72 within the locking through-hole 82. In addition, one end of a band-shaped strap 88 is hooked to the front portion 84C of the other end side (lower end side) of the lever 84, and when the other end of the strap 88 is pulled diagonally forward above the seat, the lever 84 rotates, and the first shaft portion 72 moves from inside the locking through portion 82 into the first arc hole 76, thereby unlocking the rotation of the side lower frame 34.

[0035] FIG. 3 shows a side view of the second side hinge portion 90 in a normal state when the seat back 14 is in an upright position, as viewed from the inside in the seat width direction. As shown in FIG. 3, the second side hinge portion 90 includes a second shaft portion 92 that penetrates the vertical wall portion 45B of the rear base member 45 and has an axial direction that is the seat width direction. As shown in FIG. 1, the second shaft portion 92 is fixed to the vehicle body floor F (vehicle body side) via the rear base member 45. As shown in FIG. 3, the second side hinge portion 90 includes a second rotation portion 94 that is a rotation portion that is provided to be rotatable around the rotation center axis 63 of the seat back 14. In this embodiment, the second rotation portion 94 is formed by the lower portion of the side lower frame 35 of the seat back 14. FIG. 4 shows a side view of a portion including the lower portion of the side lower frame 35 alone. As shown in FIG. 4, the second rotation portion 94 is formed with a circular hole 100 through which the rotation center shaft 63 (see FIG. 3) is inserted.

[0036] 3, a second arc hole 96 is formed in the second rotating portion 94, with the center of the arc being the center (axial center) of the rotation central shaft 63, and the second shaft portion 92 is inserted into this second arc hole 96. The second arc hole 96 is set at a position including the front side and the upper side of the seat with respect to the rotation central shaft 63 when the seat back 14 is in the upright position.

[0037] As shown in Fig. 4, the second pivoting portion 94 has a notch 98 cut out from a portion of the second arc-shaped hole 96. As shown in Fig. 3, the notch 98 is formed so that the second shaft 92 enters and abuts against the notch 98 as shown by the two-dot chain line when a load equal to or greater than a predetermined value is input toward the front side of the seat to the seat back 14 in an upright position. The second arc-shaped hole 96 and the notch 98 will be described in detail below.

[0038] The cutout 98 is formed contiguous with the inner diameter side (seat rear side) of the second arcuate hole 96 and at a position offset toward the seat upper side with respect to the lower end of the second arcuate hole 96. In other words, as shown in FIG. 3 , the edge of the second arcuate hole 96 is configured to include a rear adjacent edge 96A that is positioned adjacent to the seat rear side of at least a portion (a portion in this embodiment) of the second shaft portion 92 in a side view of the seat when the seat back 14 is in the upright position. Furthermore, a portion of the cutout 98 is located on the seat rear side of a portion of the second shaft portion 92 in a side view of the seat when the seat back 14 is in the upright position. Furthermore, the edge of the cutout 98 is configured to include a vertical edge 98A that is positioned along the seat up-down direction when the seat back 14 is in the upright position.

[0039] The notch 98 described above is a portion that auxiliarily receives a load only when a large load is input toward the front of the seat to the seatback frame 32 (see FIG. 1 ). The second shaft 92 does not abut against the notch 98 during normal use. The position of the notch 98 is set taking into consideration the rigidity of the seatback frame 32 (see FIG. 1 ). More specifically, when a large load is input toward the front of the seat to the seatback 14 while the seatback 14 is in an upright position, plastic deformation of the entire seatback 14 becomes apparent at some point. For example, a CAE analysis is performed on the state at that time and the state prior to that (the stage of elastic deformation of the entire seatback 14). The amount of recess of the notch 98 toward the rotation center shaft 63 and the position of the vertical edge 98A are set based on the analysis results and actual vehicle test results. The CAE analysis may include, for example, acquiring the position of the second shaft 92 by analyzing a model that does not reproduce the second arc hole 96 itself.

[0040] (Actions and Effects of the Embodiments) Next, the operation and effects of the above embodiment will be described.

[0041] 1 is a rear seat and a bench seat, and the seat back 14 can be tilted forward from an upright position. The left side and lower end of the seat back 14 is rotatably connected to the vehicle body by a first side hinge portion 70, and the right side and lower end of the seat back 14 is rotatably connected to the vehicle body by a second side hinge portion 90. A locking mechanism 80 provided only on the first side hinge portion 70 can lock the seat back 14 in an upright position.

[0042] Furthermore, the second shaft 92 of the second side hinge portion 90 is fixed to the vehicle body floor F (vehicle body side) via the rear base member 45, and has an axial direction that is the seat width direction. As shown in Fig. 3, the second pivoting portion 94 of the second side hinge portion 90 is rotatable around the pivot central axis 63 of the seat back 14 (see Fig. 1), and a second arc-shaped hole 96 is formed in the second pivoting portion 94, with the center of the arc being the center of the pivot central axis 63, and the second shaft 92 is inserted through the second arc-shaped hole 96. As a result, when the seat back 14 (see Fig. 1) is tilted forward from the upright position, the second shaft 92 moves relatively within the second arc-shaped hole 96, and therefore the second pivoting portion 94 of the second side hinge portion 90 rotates stably.

[0043] Here, the second pivoting portion 94 has a notch 98 cut out from a part of the second arc hole 96 so that the second shaft 92 enters and abuts against it when a load of a predetermined value or more is input toward the front of the seat to the seat back 14 in the upright position. Therefore, when a large load is input toward the front of the seat to the seat back 14 in the upright position, the second shaft 92 enters and abuts against the notch 98, thereby suppressing the rotation of the second pivoting portion 94 on the second side hinge portion 90 side, thereby suppressing the deformation of the seat back 14 and suppressing stress on the locking portion of the locking mechanism 80 provided in the first side hinge portion 70 (i.e., the stress can be dispersed).

[0044] Furthermore, in this embodiment, a vertical edge 98A, which is part of the edge of the cutout 98, is arranged so as to follow the up-and-down direction of the seat when the seat back 14 is in the upright position. Therefore, when a large load is input toward the front of the seat to the seat back 14 in the upright position and the second shaft 92 enters the cutout 98, the second shaft 92 abuts against the vertical edge 98A, and the load (reaction force) from the second shaft 92 can be stably received by the vertical edge 98A.

[0045] To provide a further explanation, when a large load is applied to the seat back 14 in an upright position toward the front of the seat, the side lower frame 35 attempts to displace along the arc direction of the second arc hole 96, but at the same time, due to play and elastic deformation of the structure, the second shaft portion 92 also attempts to displace relatively in a direction deviating from the arc direction of the second arc hole 96. Here, for example, in a comparative structure in which the notch 98 is not formed, when the large load is applied, the second shaft portion (92) moves while rubbing against the rear arc edge of the arc hole corresponding to the second arc hole 96, in other words, it is expected that the force vector will be resolved on the tangent line where the arc edge and the second shaft portion (92) come into contact. In contrast to this, in the present embodiment, a notch 98 is formed in the side lower frame 35 by cutting out a portion of the rear arc (inner diameter side arc) of the second arc hole 96, which allows for the escape of misalignment due to play or elastic deformation and suppresses the dispersion of the load received by the vertical edge portion 98A, thereby allowing the vertical edge portion 98A to stably receive the load (reaction force) from the second shaft portion 92.

[0046] Furthermore, in the present embodiment, when the seat back 14 is in the upright position, a rear adjacent edge 96A, which is part of the edge of the second arcuate hole 96, is disposed adjacent to at least a part (a part in the present embodiment) of the second shaft 92 on the seat rear side in a side view of the seat. Therefore, even if the second shaft 92 attempts to move toward the seat rear relative to the side lower frame 35 when the seat back 14 is in the upright position, the second shaft 92 can be received by the rear adjacent edge 96A. Therefore, when the seat back 14 is in the upright position and in normal operation, rattling of the second pivoting portion 94 can be suppressed, and therefore rattling of the right side (the other of the left and right) of the seat back 14 can be suppressed.

[0047] Note that by setting the rear adjacent edge 96A, the lower end position of the cutout 98 is higher in the seat up-down direction than the lower end position of the second arcuate hole 96, and in the initial stage when a large load is input toward the front of the seat with the seat back 14 in an upright position, the second shaft 92 cannot be received by the cutout 98. However, in the initial stage, the stress at the second side hinge portion 90 is low and the overall deformation of the seatback frame 32 is also small. For this reason, even if the load from the second shaft 92 were received by the cutout in the initial stage, the effect would be small. Therefore, in this embodiment, the rear adjacent edge 96A is set to prioritize the rattle suppression function during normal use, as described above.

[0048] Furthermore, in this embodiment, when the seat back 14 is in an upright position, a portion of the cutout 98 is located rearward of a portion of the second axis 92 in a side view of the seat. Therefore, when the seat back 14 is in an upright position and under normal circumstances, rattling of the second pivoting portion 94 is suppressed by the rear adjacent edge 96A, and when a large load is input toward the front of the seat to the seat back 14 in an upright position, the second axis 92 can be inserted into the cutout 98 while suppressing the amount of displacement of the second pivoting portion 94.

[0049] As described above, according to the vehicle seat 10 shown in FIG. 1 relating to this embodiment, in a configuration in which the locking mechanism 80 is provided only in the first side hinge portion 70 out of the first side hinge portion 70 and the second side hinge portion 90, the amount of deformation of the seat back 14 can be suppressed when a large load is input toward the front of the seat to the seat back 14 in an upright position.

[0050] (Supplementary explanation of the embodiment) In the above embodiment shown in Figures 1 to 4, the vehicle seat 10 is a rear seat and a bench seat, but the present invention may also be applied to a vehicle seat that is a front seat and a bench seat, or to a vehicle seat that is a rear seat and is not a bench seat.

[0051] Furthermore, in the above embodiment, the first side hinge portion 70, which is provided with the locking mechanism 80, is provided on the left side and lower end of the seat back 14, and the second side hinge portion 90, which is not provided with a locking mechanism, is provided on the right side and lower end of the seat back 14, but it is also possible to adopt a configuration in which the first side hinge portion and the second side hinge portion are reversed in left and right from the above embodiment.

[0052] Furthermore, in the above embodiment, the edge of the cutout portion 98 is configured to include a vertical edge portion 98A, and such a configuration is preferred, but as a variation of the above embodiment, for example, a configuration in which the edge of the cutout portion is formed in an approximately V-shape that is open toward the front side of the seat when viewed from the side of the seat can also be adopted.

[0053] Furthermore, in the above embodiment, the edge of the second arc-shaped hole 96 is configured to include the rear adjacent edge 96A, but as a modification of the above embodiment, a configuration may be adopted in which the edge of the arc-shaped hole (second arc-shaped hole 96) does not include a portion corresponding to the rear adjacent edge 96A. In other words, as a modification of the above embodiment, a configuration may be adopted in which the cutout portion (98) is located on the seat rear side (directly behind) of the position in the arc-shaped hole (second arc-shaped hole 96) where the shaft portion (second shaft portion 92) is located when the seat back (14) is in the upright position.

[0054] Furthermore, in the above embodiment, a portion of the cutout portion 98 is located rearward of a portion of the second axis portion 92 in a side view of the seat when the seat back 14 is in an upright position, and this configuration is preferable. However, as a variation of the above embodiment, for example, a configuration can also be adopted in which the cutout portion (98) is located above the seat rather than rearward (directly behind) the axis portion (second axis portion 92) in a side view of the seat when the seat back (14) is in an upright position.

[0055] The above-described embodiment and the above-described modifications can be implemented in appropriate combinations.

[0056] The above describes one example of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0057] 10 Vehicle seats 14 Seat back 62, 63 Rotation center axis 70 First side hinge part 76 Locking mechanism 90 Second side hinge part 92 Second shaft part (shaft part) 94 Second rotating part (rotating part) 96 Second circular arc hole (circular arc hole) 96A Posterior adjacent edge 98 Notch 98A Vertical edge

Claims

1. A vehicle seat that is at least one of a rear seat and a bench seat and has a seat back that can be tilted forward from an upright position, a first side hinge portion that rotatably connects a lower end portion of one of the left and right sides of the seat back to the vehicle body side; a second side hinge portion that rotatably connects a lower end portion of the other of the left and right sides of the seat back to the vehicle body side; and a locking mechanism that is provided only on the first side hinge portion and is capable of locking the seat back in the upright position, The second side hinge portion a shaft portion fixed to the vehicle body and having an axial direction in the seat width direction; a rotation portion that is rotatable about a rotation center axis of the seat back, that has an arc hole with an arc center that coincides with the center of the rotation center axis, and that has the shaft portion inserted into the arc hole; Equipped with The vehicle seat has a notch cut out from a part of the arc hole in the rotating portion so that the shaft portion can enter and abut when a load of a predetermined value or more is input toward the front side of the seat to the seat back in the upright position.

2. 2. The vehicle seat according to claim 1, wherein an edge of the notch includes a vertical edge that is disposed along the up-down direction of the seat when the seat back is in the upright position.

3. 2. The vehicle seat according to claim 1, wherein an edge of the arc hole includes a rear adjacent edge portion that is positioned adjacent to a rear side of the seat relative to at least a portion of the shaft portion in a side view of the seat when the seat back is in the upright position.

4. The vehicle seat according to claim 3 , wherein a portion of the notch is located rearward of the seat with respect to a portion of the shaft when the seat back is in the upright position.

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