Sheet frame structure for vehicle

Abstract

To provide a sheet frame structure for vehicle that can suppress the reduction in the binding force of an occupant due to fall-down of a buckle device in the collision of a vehicle and a manufacturing method of a bracket used in the vehicle seat frame structure.SOLUTION: A seat belt stay 36, which constitutes a part of a buckle device 22 for a seat belt 20, is attached to an anchor bracket 30 via an anchor bolt 32 fastened to the anchor bracket 30 fixed to a slide rail 16. In a vehicle seat 10, a fall-down suppression function is provided between the side frame 42 and the anchor bolt 32, and it is set that fall-down to the outer side in the vehicle width direction of the seat belt stay 36 is suppressed by the fall-down suppression function in the collision of the vehicle. With this, in the vehicle seat 10, the reduction in the binding force of an occupant due to fall-down of the buckle device 22 can be suppressed in the collision of the vehicle.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle seat frame structure and a method for manufacturing a bracket used in the vehicle seat frame structure. [Background technology]

[0002] The following Patent Document 1 discloses technology relating to a three-point seat belt device. This prior art is provided with an interference structure consisting of multiple recesses formed on one side of the buckle stay (hereinafter referred to as the "buckle device") and the seat side member, and protrusions formed on the other side of the buckle stay and the seat side member, and when the pretensioner is activated, the protrusions engage with the recesses to prevent the buckle device from rotating around the anchor rotation axis toward the front of the seat in the event of a frontal collision of the vehicle, thereby improving the restraining performance for restraining the occupant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-103624 A Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, for example, when the seat belt is pulled out during a frontal collision of the vehicle, a load acts on the buckle device toward the pillar side (outer side in the vehicle width direction) to which the seat belt is attached, and at that time, the buckle device may collapse toward the outer side in the vehicle width direction. When the buckle device collapses toward the outer side in the vehicle width direction in this way, the restraining force for the occupant is reduced.

[0005] In other words, in the case of the above-mentioned conventional technology, although the rotation of the buckle device towards the front side of the seat is suppressed, the technology does not have the function of suppressing the buckle device from collapsing outward in the vehicle width direction.

[0006] In consideration of the above-mentioned facts, the present invention aims to provide a vehicle seat frame structure that can suppress a decrease in the restraining force of an occupant due to the collapse of a buckle device in the event of a vehicle collision, and a manufacturing method for a bracket used in this vehicle seat frame structure. [Means for solving the problem]

[0007] In order to solve the above problem, the vehicle seat frame structure of the invention described in claim 1 has a seat cushion frame that serves as the skeleton of the seat cushion on which an occupant sits, and includes side frames that are arranged outside the seat width direction and inside the vehicle width direction and extend in the seat front-rear direction, brackets that are provided on the vehicle body floor and are fixed to slide rails that enable the seat cushion to slide in the seat front-rear direction, anchor bolts that are arranged inside the side frames in the vehicle width direction and fasten to the brackets to attach seat belt stays that form part of a seat belt buckle device to the brackets, and a collapse suppression function that is formed between the side frames and the anchor bolts and suppresses the seat belt stays from collapsing outward in the vehicle width direction in the event of a vehicle collision.

[0008] The vehicle seat frame structure according to claim 1 includes a side frame, a bracket, an anchor bolt, and a collapse suppression function. The side frame is disposed on the outer side in the seat width direction and the inner side in the vehicle width direction of the seat cushion frame that is the framework of the seat cushion on which the occupant sits, and extends in the front-rear direction of the seat. A slide rail is provided to allow the cushion to slide in the front-rear direction of the seat, and the bracket is fixed to the slide rail. The anchor bolt is disposed on the inner side of the side frame in the vehicle width direction, and fastens to the bracket to attach a seat belt stay that constitutes a part of the seat belt buckle device to the bracket.

[0009] In the present invention, a collapse suppression function is provided between the side frame and the anchor bolt, and the collapse suppression function suppresses the seat belt stay from collapsing outward in the vehicle width direction during a vehicle collision. In this way, by suppressing the seat belt stay from collapsing outward in the vehicle width direction, it is possible to suppress a decrease in the restraining force of the occupant due to the collapse of the buckle device during a vehicle collision.

[0010] The vehicle seat frame structure of the invention described in claim 2 is the vehicle seat frame structure described in claim 1, in which the anchor bolt is positioned at a position overlapping the side frame in a side view of the seat, as the collapse prevention function.

[0011] In the vehicle seat frame structure described in claim 2, the anchor bolt is positioned so as to overlap with the side frame when viewed from the side of the seat, thereby preventing the seat belt stay from collapsing outward in the vehicle width direction in the event of a vehicle collision, as a collapse prevention function.

[0012] The anchor bolt for attaching the seat belt stay, which constitutes part of the buckle device, is disposed inside the side frame in the vehicle width direction. In the event of a vehicle collision, if a load acting toward the outside in the vehicle width direction acts on the anchor bolt via the seat belt stay of the buckle device, the anchor bolt will interfere (directly or indirectly) with the side frame since, in the present invention, the anchor bolt is disposed at a position overlapping with the side frame in a side view of the seat. This restricts the anchor bolt from moving outward in the vehicle width direction. As a result, the seat belt stay is prevented from collapsing outward in the vehicle width direction.

[0013] Here, "directly or indirectly interfering" means not only that the anchor bolt directly abuts (interferes with) the side frame, but also that in cases where a seat cover or the like is provided on the inside of the side frame in the vehicle width direction, the anchor bolt will indirectly interfere with the side frame via the seat cover.

[0014] The vehicle seat frame structure of the invention described in claim 3 is the vehicle seat frame structure described in claim 1 or claim 2, in which a bead portion protruding toward the inside in the vehicle width direction is formed in the side frame as the collapse prevention function.

[0015] In the vehicle seat frame structure described in claim 3, the side frame is provided with a bead portion protruding inward in the vehicle width direction as a collapse suppression function, which makes it possible to improve the rigidity of the side frame itself, thereby suppressing the seat belt stay from collapsing outward in the vehicle width direction in the event of a vehicle collision.

[0016] In other words, in the present invention, by forming the bead portion in the side frame, the rigidity of the side frame itself can be improved, and therefore deformation of the side frame can be suppressed. When a load toward the outside in the vehicle width direction acts on the buckle device during a vehicle collision, the load toward the outside in the vehicle width direction acts on the side frame via the seat belt stay of the buckle device.

[0017] As described above, in the present invention, since the deformation of the side frame itself is suppressed, when the seat belt stay interferes with the side frame (directly or indirectly), the movement of the seat belt stay can be restricted, and the seat belt stay is prevented from collapsing outward in the vehicle width direction. It is possible to suppress congestion.

[0018] The vehicle seat frame structure according to the invention recited in claim 4 is the vehicle seat frame structure recited in claim 3, wherein the anchor bolt is disposed at a position overlapping with the bead portion in a side view of the seat.

[0019] In the vehicle seat frame structure described in claim 4, the anchor bolt is disposed at a position overlapping with the bead portion in a side view of the seat, so that when a load toward the outside in the vehicle width direction acts on the buckle device during a vehicle collision, the anchor bolt interferes with the bead portion of the side frame. In this way, the anchor bolt interferes with a portion of the side frame that has high rigidity, so that it is possible to further suppress the seat belt stay from collapsing toward the outside in the vehicle width direction.

[0020] The vehicle seat frame structure of the invention described in claim 5 is the vehicle seat frame structure described in claim 4, in which a lower edge bead portion protruding toward the inside in the vehicle width direction is formed at least at the lower edge portion of the side frame, and the lower edge bead portion is formed so as to be connected to the bead portion.

[0021] In the vehicle seat frame structure according to the invention recited in claim 5, a lower edge bead portion is formed at least on the lower edge of the side frame, protruding toward the inside in the vehicle width direction, thereby making it possible to improve the rigidity of the side frame itself. Furthermore, the lower edge bead portion is formed so as to be connected to the bead portion, making it possible to improve the rigidity of the bead portion itself.

[0022] The vehicle seat frame structure according to the invention described in claim 6 is a vehicle seat frame structure described in any one of claims 1 to 5, wherein the side frame includes a side frame main body that constitutes the outer shape of the side frame, and a patch member that is joined to the outer side of the side frame main body in the vehicle width direction and forms a closed cross-sectional portion between the side frame main body and the patch member.

[0023] In the vehicle seat frame structure described in claim 6, the side frame includes a side frame body and a patch member, and the side frame body defines the outer shape of the side frame. Meanwhile, the patch member is joined to the outer side of the side frame body in the vehicle width direction and forms a closed cross-sectional portion between the side frame body and the patch member.

[0024] In this way, by providing the patch member on the side frame body, the rigidity of the side frame itself can be improved compared to when the patch member is not provided. Furthermore, since the patch member forms a closed cross-sectional portion between the side frame body and the patch member, the rigidity of the side frame itself can be further improved compared to when the patch member is simply joined to the side frame body.

[0025] The vehicle seat frame structure according to the invention recited in claim 7 is the vehicle seat frame structure recited in claim 6, wherein a portion of the joint where the side frame main body and the patch member are joined is provided in a position overlapping with approximately the center of a bead portion formed in the side frame main body protruding inward in the vehicle width direction, in a side view of the seat.

[0026] In the vehicle seat frame structure described in claim 7, the side frame is configured to include a side frame main body and a patch member, and a part of a joint where the side frame main body and the patch member are joined is provided at a position overlapping with a substantially central part of the bead portion in a side view of the seat. Since the bead portion is formed in the side frame main body so as to protrude toward the inside in the vehicle width direction, The approximate center of the bead portion is more easily deformed than the outer edge of the bead portion.

[0027] For this reason, in the present invention, a part of the joint where the side frame body and the patch member are joined is provided at a position that overlaps approximately the center of the bead portion in a side view of the seat, thereby improving the rigidity of the bead portion and, as a result, further improving the rigidity of the side frame itself.

[0028] The vehicle seat frame structure of the invention described in claim 8 is a vehicle seat frame structure described in any one of claims 1 to 7, which is provided with a lifter mechanism that moves the seat cushion up and down relative to the slide rail, and the anchor bolt is arranged so as to overlap with a bead portion formed on the side frame protruding toward the inside in the vehicle width direction when viewed from the side of the seat, regardless of the vertical position of the seat cushion.

[0029] The vehicle seat frame structure according to the invention recited in claim 8 is provided with a lifter mechanism, and the seat cushion moves up and down relative to the slide rail. Therefore, in the present invention, the anchor bolt is disposed so as to overlap with a bead portion formed on the side frame protruding toward the inside in the vehicle width direction in a side view of the seat, regardless of the vertical position of the seat cushion.

[0030] As a result, in the present invention, even if a load toward the outside in the vehicle width direction acts on the side frame via the seat belt stay of the buckle device during a vehicle collision, the anchor bolt interferes (directly or indirectly) with the bead portion of the side frame, and the movement of the anchor bolt toward the outside in the vehicle width direction is restricted. In other words, in the present invention, it is possible to further suppress the collapse of the seat belt stay toward the outside in the vehicle width direction, regardless of the vertical position of the seat cushion.

[0031] The vehicle seat frame structure according to the invention described in claim 9 is a vehicle seat frame structure described in any one of claims 1 to 8, wherein the bracket includes a fixing portion fixed to an upper end of the slide rail and formed substantially horizontally, a vertical wall portion that rises on the inside of the fixing portion in the vehicle width direction and to which the anchor bolt is fastened, and a protruding portion formed to protrude toward the inner angle formed between the fixing portion and the vertical wall portion.

[0032] In the vehicle seat frame structure according to the invention recited in claim 9, the bracket includes a fixed portion, a vertical wall portion, and a protruding portion. The fixed portion is fixed to an upper end of the slide rail and is formed substantially horizontally. The vertical wall portion stands on the inside of the fixed portion in the vehicle width direction, and an anchor bolt is fastened to the fixed portion. The protruding portion is formed to protrude toward the inner angle formed between the fixed portion and the vertical wall portion. In other words, the protruding portion is provided at the boundary between the fixed portion and the vertical wall portion.

[0033] In this way, in the present invention, by forming a protrusion at the boundary between the fixing portion and the vertical wall portion that constitute the bracket, the rigidity of the bracket itself can be improved compared to a case in which the protrusion is not formed, and this makes it possible to suppress deformation of the bracket itself to which the seat belt stay is attached.

[0034] The method for manufacturing a bracket according to the invention recited in claim 10 is a method for manufacturing a bracket according to any one of claims 1 to 9, and includes a first step of fixing the anchor bolt to one side of a sheet metal member bent with the other side standing upright relative to the one side, and a second step of bending one side of the sheet metal member so as to face the other side of the sheet metal member, starting from a position away from the boundary with the other side of the sheet metal member, on one side of the sheet metal member.

[0035] The method for manufacturing a bracket according to the invention recited in claim 10 includes a first step and a second step. In the first step, an anchor bolt is fixed to one side of a bent sheet metal member with the other side standing upright relative to the one side. Next, in the second step, one side of the sheet metal member is bent so as to face the other side of the sheet metal member, starting from a position spaced from the boundary of the other side of the sheet metal member.

[0036] For example, when welding an anchor bolt after bending (second step), it is necessary to secure a gap on the bracket side for welding the anchor bolt, and manufacturing problems with the welding torch must be considered. In contrast, in the present invention, the anchor bolt is fixed to the sheet metal member before bending (first step), so such manufacturing problems do not occur. Therefore, in the present invention, it is possible to secure design freedom that prioritizes performance required in the event of a vehicle collision. Effect of the Invention

[0037] As described above, according to the vehicle seat frame structure of claim 1, it is possible to suppress a decrease in the restraining force for an occupant caused by the collapse of the buckle device in the event of a vehicle collision.

[0038] According to the vehicle seat frame structure of claim 2, the anchor bolt is disposed at a position overlapping with the side frame in a side view of the seat, thereby making it possible to prevent the seat belt stay from collapsing outward in the vehicle width direction.

[0039] According to the vehicle seat frame structure of claim 3, the rigidity of the side frame itself is improved, thereby suppressing deformation of the side frame and suppressing collapse of the seat belt stays outward in the vehicle width direction.

[0040] In the vehicle seat frame structure described in claim 4, the anchor bolt is disposed at a position overlapping with the bead portion in a side view of the seat, thereby making it possible to further suppress the seat belt stay from collapsing outward in the vehicle width direction.

[0041] In the vehicle seat frame structure described in claim 5, the rigidity of the side frame itself can be improved, and the rigidity of the bead portion can also be improved.

[0042] In the vehicle seat frame structure according to claim 6, the rigidity of the side frame itself can be improved by providing a patch member that forms a closed cross-sectional portion between itself and the side frame main body.

[0043] In the vehicle seat frame structure described in claim 7, the rigidity of the bead portion can be improved, and the rigidity of the side frame itself can be further improved.

[0044] In the vehicle seat frame structure according to the invention recited in claim 8, the seat belt stays can be prevented from collapsing outward in the vehicle width direction, regardless of the vertical movement of the seat cushion.

[0045] In the vehicle seat frame structure according to the ninth aspect, deformation of the bracket itself to which the seat belt stay is attached can be suppressed.

[0046] According to the method for manufacturing a bracket according to the invention recited in claim 10, it is possible to improve the degree of freedom in design with a priority given to performance. [Brief description of the drawings]

[0047] [Figure 1] 1 is a perspective view showing a vehicle seat to which a vehicle seat frame structure according to an embodiment of the present invention is applied; [Diagram 2] 1 is a side view showing a vehicle seat to which a vehicle seat frame structure according to an embodiment of the present invention is applied. [Diagram 3] 3 is a longitudinal sectional view showing a cross section taken along line AA in FIG. 2. [Figure 4] FIG. 4 is an enlarged vertical cross-sectional view showing a lower part of FIG. 3 on an enlarged scale. [Diagram 5] 1 is a perspective view showing a main portion of a side frame that constitutes a part of a vehicle seat frame structure according to the present embodiment, as viewed from the inside in a seat width direction. [Figure 6] 6 is a vertical cross-sectional view showing a cross section of the side frame shown in FIG. 5 taken along line BB. [Figure 7]1 is a perspective view showing a bracket that constitutes a part of a vehicle seat frame structure according to the present embodiment, as viewed from the outside and below in a seat width direction. [Figure 8] 1 is an enlarged side view of a vehicle seat to which the vehicle seat frame structure according to the present embodiment is applied, showing a state in which a seat cushion is positioned at a lowermost position; FIG. [Figure 9] FIG. 1 is an enlarged side view of a vehicle seat to which the vehicle seat frame structure according to the present embodiment is applied, showing a state in which a seat cushion is positioned at an intermediate position between an upper most position and a lower most position. [Figure 10] 1 is an enlarged side view of a vehicle seat to which the vehicle seat frame structure according to the present embodiment is applied, showing a state in which a seat cushion is positioned at an uppermost position; FIG. [Figure 11] 1A and 1B show a method for manufacturing a bracket that constitutes a part of the vehicle seat frame structure according to the present embodiment, in which (A) is a cross-sectional view showing a first step, and (B) is a cross-sectional view showing a second step. [Figure 12] 9 is an enlarged side view of a main portion corresponding to FIG. 8 and showing a modified example of a vehicle seat to which the vehicle seat frame structure according to the present embodiment is applied. FIG. [Figure 13] 8 is an enlarged side view of a main portion corresponding to FIG. 7, showing a modified example of a vehicle seat to which the vehicle seat frame structure according to the present embodiment is applied. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] A vehicle seat 10 to which a vehicle seat frame structure according to an embodiment of the present invention is applied will be described below with reference to the drawings. Note that the arrows FR, UP, RH, IN, and OUT shown appropriately in each drawing indicate the front (direction of travel), upper, right, inside, and outside of the vehicle width direction, respectively. In the following description, when the directions of front-rear, left-right, and up-down are simply used, they will indicate front-rear in the front-rear direction of the vehicle, left-right in the left-right direction of the vehicle (vehicle width direction), and up-down in the up-down direction of the vehicle, unless otherwise specified.

[0049] (Configuration of vehicle seat frame structure) First, the configuration of a vehicle seat 10 to which the vehicle seat frame structure according to this embodiment is applied will be described.

[0050] As shown in FIG. 1, a vehicle seat 10 to which the vehicle seat frame structure according to the present embodiment is applied includes a seat cushion 12 on which an occupant sits, and a seat back 14 whose lower end is connected to the rear end of the seat cushion 12 and supports the upper body of the occupant. A headrest (not shown) is attached to the upper end of the seat back 14. .

[0051] On the other hand, a pair of left and right slide rails 16 are provided on the floor of the vehicle body (not shown). The vehicle seat 10 is slidable along the slide rail 16. The seat 10 is provided with a lifter mechanism 18, which allows the vehicle seat 10 to move up and down relative to the left and right slide rails 16. The vehicle seat 10 is provided with a buckle device 22 to which a seat belt 20 is connected.

[0052] Here, the vehicle seat 10 in this embodiment is provided so that an occupant sits facing the front of the vehicle, and the front-rear direction, left-right direction (seat width direction) and up-down direction of the vehicle seat 10 coincide with the front-rear, left-right, up-down directions of the vehicle. Also, in this embodiment, the vehicle seat 10 is the driver's seat of a left-hand drive vehicle, but it may be applied to the driver's seat, passenger seat or rear seat of a right-hand drive vehicle. Note that when the configuration of this embodiment is applied to the driver's seat of a right-hand drive vehicle, the left-right configuration is reversed from that of this embodiment.

[0053] The pair of left and right slide rails 16 each have a lower rail 24 and an upper rail 26. The lower rail 24 is disposed such that its longitudinal direction is aligned with the front-rear direction, and the front and rear ends of the lower rail 24 are attached to the vehicle body floor (not shown) via mounting brackets (not shown). The upper rail 26 is fixed to the front and rear ends of the vehicle. The upper rail 26 is supported so as to be slidable along the longitudinal direction relative to the lower rail 24. However, normally, a slide lock mechanism (not shown) restricts the upper rail 26 from sliding relative to the lower rail 24, and the slide restriction by the slide lock mechanism is released by operating a lock release lever 28.

[0054] An anchor bracket 30 is fixed to the upper surface of the rear part of the upper rail 26 disposed on the right side (here, the inside in the vehicle width direction) of the vehicle seat 10. This anchor bracket 30 is formed to match the width dimension of the slide rail 16, and has a substantially U-shaped cross section when cut along the width direction of the slide rail 16 (vehicle width direction).

[0055] 3, the anchor bracket 30 includes a fixed portion 30A fastened to the upper rail 26, and a pair of vertical wall portions 30B, 30C that stand upright from both ends of the fixed portion 30A in the seat width direction and face each other. The vertical wall portion 30B is disposed on the inside in the vehicle width direction and is formed to be higher than the vertical wall portion 30C. A lower end portion of a seat belt stay 36 that constitutes a part of the buckle device 22 is fastened to the upper end portion of the vertical wall portion 30B via an anchor bolt 32 and a nut 34, and the seat belt stay 36 is rotatable around the axis of the anchor bolt 32 within a predetermined angle.

[0056] 1, a buckle 38 is fixed to the upper end of the seat belt stay 36. A tongue plate 39 attached to the seat belt 20 of a three-point seat belt device is connected to this buckle 38, and when an occupant P seated on the seat cushion 12 connects the tongue plate 39 to the buckle 38, the occupant P is restrained by the seat belt 20.

[0057] Meanwhile, the seat cushion 12 of the vehicle seat 10 includes a seat cushion frame 40 disposed above the left and right slide rails 16. The seat cushion frame 40 includes left and right side frames 42, 43, a rear frame 44, and a front frame 46. The side frame 42 is disposed on the inside in the vehicle width direction, and the side frame 43 is disposed on the outside in the vehicle width direction.

[0058] The left and right side frames 42, 43 are formed in an elongated shape using, for example, sheet metal material, and are disposed along the front-rear direction. Of the side frames 42, 43, the specific configuration of the side frame 42 disposed on the inner side in the vehicle width direction will be described later.

[0059] The rear frame 44 is formed, for example, from a metal pipe material, and is bridged between the rear ends of the left and right side frames 42, 43 with its axial direction (longitudinal direction) aligned along the left-right direction (of the vehicle seat 10). Although not shown, both longitudinal ends of the rear frame 44 are inserted into circular through-holes formed in the rear ends of the left and right side frames 42, 43, and are retained by means such as crimping. As a result, the rear ends of the left and right side frames 42, 43 are connected to each other by the rear frame 44, and the rear frame 44 is rotatable about an axis aligned along the left-right direction relative to the left and right side frames 42, 43.

[0060] The lower end of a seat back frame 48, which is a framework member of the seat back 14, is connected to the rear ends of the left and right side frames 42, 43 via a well-known reclining mechanism. A cushion pad covered with a seat cover is attached to the seat cushion frame 40 and the seat back frame 48.

[0061] The front frame 46 is formed in an elongated shape using, for example, a sheet metal material, with its longitudinal direction aligned along the left-right direction, and is bridged between the front ends of the left and right side frames 42, 43 of the vehicle seat 10. Both longitudinal ends of the front frame 46 are joined to the left and right side frames 42, 43, and the front frame 46 connects the front ends of the left and right side frames 42, 43 in the seat width direction.

[0062] A connecting pipe 50 is provided below the front frame 46. The connecting pipe 50 constitutes a part of the seat cushion frame 40 and also constitutes a part of the lifter mechanism 18 described later. The connecting pipe 50 is formed, for example, of a metal pipe material, and is bridged between the front ends of the left and right side frames 42, 43 with its axial direction (longitudinal direction) along the left-right direction. Both ends of the connecting pipe 50 in the longitudinal direction are inserted into circular through holes formed in the front ends of the left and right side frames 42, 43, and are prevented from being pulled out by means of crimping or the like. As a result, the front ends of the left and right side frames 42, 43 are connected in the left-right direction by the connecting pipe 50, and the connecting pipe 50 is rotatable about an axis along the left-right direction relative to the left and right side frames 42, 43.

[0063] On the other hand, the lifter mechanism 18 includes a pair of left and right front links 52 provided between the front ends of the left and right side frames 42, 43 and the front ends of the left and right upper rails 26, and a pair of left and right rear links 54 provided between the rear ends of the left and right side frames 42, 43 and the rear ends of the left and right upper rails 26. Note that in Fig. 1, only the right front link 52 and the left rear link 54 of the vehicle seat 10 are illustrated.

[0064] The left and right front links 52 are formed, for example, from sheet metal material in an elongated shape along the front-rear direction, and are connected to brackets 53 fixed to the front ends of the left and right upper rails 26, and are rotatable about an axis along the left-right direction relative to the left and right upper rails 26. Furthermore, a circular through-hole (not shown) is formed in the longitudinal rear end of each of the left and right front links 52, and a longitudinal end of the connecting pipe 50 is inserted into each through-hole, and the longitudinal rear end of each of the left and right front links 52 and the connecting pipe 50 are joined by means of welding or the like.

[0065] As a result, the left and right front links 52 are connected to the front ends of the left and right side frames 42, 43 via the connecting pipe 50, and are capable of rotating integrally with the connecting pipe 50 around an axis along the left-right direction relative to the left and right side frames 42, 43.

[0066] The left and right rear links 54 are formed, for example, from a sheet metal material in an elongated shape along the front-rear direction, and the longitudinal front end portions of the left and right rear links 54 are connected to the vertical wall portion 30C of the anchor bracket 30 fixed to the rear end side of the upper rail 26 via a connecting shaft (not shown) whose axial direction is along the left-right direction. This allows the left and right rear links 54 to rotate about an axis along the left-right direction relative to the left and right upper rails 26. In addition, a circular through hole (not shown) is formed in the longitudinal rear end portions of the left and right rear links 54, and a longitudinal end portion of the rear frame 44 is inserted into each through hole, and the longitudinal rear end portions of the left and right rear links 54 and the rear frame 44 are joined by means such as welding.

[0067] As a result, the left and right rear links 54 are connected to the rear ends of the left and right side frames 42, 43 via the rear frame 44, and are capable of rotating integrally with the rear frame 44 around an axis along the left-right direction relative to the left and right side frames 42, 43.

[0068] That is, with the above-described configuration, in the lifter mechanism 18, a four-joint link mechanism is formed by the front link 52, the rear link 54, the side frames 42, 43 and the upper rail 26, and the seat cushion frame 40 is connected to the left and right slide rails 16 so as to be movable up and down.

[0069] Here, in this embodiment, of the side frames 42, 43, at least the side frame 42 arranged on the inside in the vehicle width direction is configured to include a side frame main body 70 that forms the outer shape of the side frame 42, and a patch member 74 provided on the inside in the seat width direction of the side frame main body 70 (outside in the vehicle width direction), as shown in Figures 4 and 5.

[0070] As shown in FIG. 2, the side frame main body 70 is formed in an elongated shape along the front-to-rear direction, and as shown in FIG. 2 and FIG. 4, an upper end bead portion 70A and a lower end bead portion 70B that protrude toward the inside in the vehicle width direction are formed at the upper end and lower end of the side frame main body 70, respectively.

[0071] Further, a triangular bead portion 72 that is connected to the lower end bead portion 70B, forms a triangular shape in a side view of the seat, and protrudes outward in the seat width direction is provided at an approximate center in the longitudinal direction of the side frame 42. As described later, the anchor bolt 32 and the nut 34 fastened to the vertical wall portion 30B of the anchor bracket 30 are disposed at a position overlapping with the upper end bead portion 70A, the triangular bead portion 72, and the lower end bead portion 70B in a side view of the seat, as shown in Figs. 8 to 10, regardless of the height position of the seat cushion 12 by the lifter mechanism 18 of the vehicle seat 10.

[0072] On the other hand, as shown in Figures 4 and 5, the patch member 74 is joined by welding or the like in approximately the center of the side frame main body 70 in the seat front-rear direction so as to cover the entire side frame main body 70 except for the lower end portion.

[0073] Specifically, a flange portion 70A1 is formed on the outer edge of the side frame main body 70, and is folded back toward the inside in the seat width direction (outside in the vehicle width direction). A flange portion 74A1 is formed on the upper end of the patch member 74, and the flange portion 74A1 is joined so as to overlap the underside of the flange portion 70A1.

[0074] In addition, an upper end bead portion 74A is formed at the upper end of the patch member 74, protruding toward the inside in the seat width direction at a position opposite to the upper end bead portion 70A formed at the upper end of the side frame main body 70. The patch member 74 is formed by bonding the upper end bead portion 74A and the side frame main body The upper end bead portion 70A of the side frame 70 is joined to the side frame main body 70 so as to form a closed cross-sectional portion 76 between the upper end bead portion 70A and the upper end bead portion 70A (joint portion 77).

[0075] Furthermore, a bent portion 78 is formed at the lower end of the patch member 74, bending toward the inside in the vehicle width direction (toward the triangular bead portion 72) at a position facing an upper portion of the triangular bead portion 72 formed on the side frame main body 70. The patch member 74 is joined to the side frame main body 70 so that a closed cross-sectional portion 80 including a gap between the bent portion 78 and the triangular bead portion 72 of the side frame main body 70 is formed on the lower side of the closed cross-sectional portion 76.

[0076] A flange portion (joint portion) 78A is formed downward from the outer edge of the bent portion 78, and as shown in Fig. 6, the flange portion 78A is joined to an approximate center portion 72A of the triangular bead portion 72. Here, the approximate center portion 72A of the triangular bead portion 72 in this embodiment refers to a region other than the edge side of the triangular bead portion 72.

[0077] 1, the seat cushion frame 40 is moved up and down relative to the left and right slide rails 16 by the lifter mechanism 18. Therefore, the height dimension between the slide rails 16 and the seat cushion frame 40 varies depending on the up and down movement of the seat cushion frame 40.

[0078] For example, in terms of the height position of the seat cushion 12 by the lifter mechanism 18 of the vehicle seat 10, Fig. 8 shows the lower most position which is the lowest position, and Fig. 10 shows the upper most position which is the highest position. Also, Fig. 9 shows the height position of the seat cushion 12 (see Fig. 1) at an intermediate position between the upper most position and the lower most position.

[0079] As shown in Fig. 4, the anchor bracket 30 is fixed to the upper rail 26 of the slide rail 16, and the side frame 42 is a member that constitutes a part of the seat cushion frame 40. In this embodiment, the anchor bolt 32 fastened to the vertical wall portion 30B of the anchor bracket 30 is disposed so as to overlap with the upper end bead portion 70A, the triangular bead portion 72, and the lower end bead portion 70B formed on the side frame 42 in a side view of the seat, regardless of the vertical position of the seat cushion 12, as shown in Figs.

[0080] In the upper end bead portion 70A, the triangular bead portion 72, and the lower end bead portion 70B, the portions where the ridgelines 70A2, 70A3, 72B, and 70B1 are formed have higher rigidity than other portions. For this reason, it is preferable that the anchor bolt 32 is disposed so as to overlap with the ridgelines 70A2 and 70A3 of the upper end bead portion 70A, the ridgeline 72B of the triangular bead portion 72, and the ridgeline 70B1 of the lower end bead portion 70B.

[0081] Here, the seat belt stay 36 is rotatable within a predetermined angle around the axis of the anchor bolt 32, and the side frame 42 moves in the up-down direction via the seat cushion 12. For the above reasons, in this embodiment, the axis P of the seat belt stay 36 and the triangular bead portion 72 need to be set so as to overlap in a side view of the seat in accordance with the movement trajectory of the seat belt stay 36. Therefore, in this embodiment, the shape of the triangular bead portion 72 is set to a triangular shape, but is not limited thereto, and may be other shapes such as a rectangular shape or a sector shape.

[0082] In this embodiment, the anchor bolts 32 are arranged to overlap the upper end bead portion 70A, the triangular bead portion 72, and the lower end bead portion 70B formed on the side frame 42 in a side view of the seat, regardless of the vertical position of the seat cushion 12. Compared to the case where the anchor bolt 32 is set to overlap the lower end bead portion 70B, the anchor bolt 32 needs to be positioned on the upper side as shown in Fig. 8. Therefore, in this embodiment, the height of the vertical wall portion 30B of the anchor bracket 30 needs to be increased, and the vertical wall portion 30B is formed so as to be higher than the vertical wall portion 30C.

[0083] As shown in FIG. 4, in this embodiment, the anchor bracket 30 includes a fixed portion 30A, a vertical wall portion 30B, and a vertical wall portion 30C, and the fixed portion 30A is fixed to the upper end of the slide rail 16, and the vertical wall portions 30B and 30C stand upright from the fixed portion 30A.

[0084] As described above, the vertical wall portion 30B is formed to be higher than the vertical wall portion 30C, and therefore, as shown in Fig. 7, a protrusion 30D protruding from (the surface on which) the vertical wall portion 30B toward the outside in the vehicle width direction and a protrusion 30E protruding upward from (the surface on which) the fixed portion 30A are provided at the boundary portion 31 between the fixed portion 30A and the vertical wall portion 30B on the inner angle side formed between the fixed portion 30A and the vertical wall portion 30B. Therefore, the portion where the protrusions 30D and 30E are formed is formed to be recessed toward the inside in the seat width direction when viewed from the outside in the seat width direction.

[0085] Also, as shown in Figures 1 and 4, the fixing portion 30A is provided with a convex bead portion 30F that protrudes upward from the vertical wall portion 30B to the vertical wall portion 30C, and the convex bead portion 30F is bridged between the vertical wall portion 30B and the vertical wall portion 30C.

[0086] On the other hand, as shown in FIG. 4, the anchor bracket 30 has a generally U-shaped cross-sectional shape when cut along the width direction of the slide rail 16 (vehicle width direction), and is configured to include a fixing portion 30A and vertical wall portions 30B and 30C facing each other, and an anchor bolt 32 is welded to the vertical wall portion 30B.

[0087] Here, in the manufacturing method of the anchor bracket 30, for example, although not shown, when the anchor bracket 30 is formed into a substantially U-shape and then the anchor bolt 32 is welded to the vertical wall portion 30B, it is necessary to ensure a gap on the anchor bracket 30 side for welding the anchor bolt 32, and this creates a need to consider issues in manufacturing the welding torch.

[0088] For this reason, in this embodiment, as shown in FIG. 11(A), first, in a first step, in a sheet metal member 84 bent with the other 84B side standing upright relative to the one 84A side, an anchor bolt 32 is inserted into a through hole 86 formed on the one 84A side of the sheet metal member 84, and then, as shown in FIG. 11(B), the anchor bolt 32 is welded (fixed) to the one 84A side of the sheet metal member 84.

[0089] 11(C), on one 84A side of the sheet metal member 84, starting from position Q spaced from the boundary portion 88 on the other 84B side of the sheet metal member 84, the one 84A side of the sheet metal member 84 is bent so as to face the other 84B side of the sheet metal member 84. In this way, the anchor bracket 30 is formed.

[0090] (Action and Effect of Vehicle Seat Frame Structure) Next, the operation and effects of the vehicle seat 10 to which the vehicle seat frame structure according to this embodiment is applied will be described.

[0091] In this embodiment, as shown in Fig. 1, the side frame 42 is disposed on the outer side in the seat width direction and on the inner side in the vehicle width direction of the seat cushion frame 40. An anchor bracket 30 is fixed to the ride rail 16, and an anchor bolt 32 (see FIG. 3) and a nut 34 are fastened to the anchor bracket 30. A seat belt stay 36, which constitutes a part of the buckle device 22 of the seat belt 20, is attached to the anchor bracket 30 via the anchor bolt 32.

[0092] In this embodiment, a collapse suppression function is provided between the side frame 42 and the anchor bolt 32, and is set to suppress the collapse of the seat belt stay 36 outward in the vehicle width direction in the event of a vehicle collision. As a result, in this embodiment, a decrease in the restraining force of the occupant due to the collapse of the buckle device 22 in the event of a vehicle collision can be suppressed.

[0093] For example, although not shown, when the seat belt 20 is pulled out during a frontal collision of the vehicle, a load acts on the buckle device 22 toward the pillar side (outer side in the vehicle width direction) to which the seat belt 20 is attached. At this time, if the buckle device 22 collapses toward the outer side in the vehicle width direction, the restraining force for the occupant is reduced.

[0094] Therefore, in this embodiment, as shown in Figures 3 and 4, as a collapse prevention function, the anchor bolt 32 is set to be positioned at a position overlapping with the side frame 42 when viewed from the side of the seat, thereby preventing the seat belt stay 36 from collapsing outward in the vehicle width direction in the event of a vehicle collision.

[0095] To explain in more detail, first, as a premise, the anchor bolt 32 for attaching the seat belt stay 36 constituting a part of the buckle device 22 is disposed inside in the vehicle width direction from the side frame 42. In this embodiment, the anchor bolt 32 is disposed at a position overlapping with the side frame 42 in a side view of the seat. Therefore, in the event of a vehicle collision, when a load acts on the anchor bolt 32 via the seat belt stay 36 toward the outside in the vehicle width direction, the anchor bolt 32 interferes with the side frame 42.

[0096] As described above, a cushion pad covered with a seat cover (not shown) is attached to the seat cushion frame 40, so strictly speaking, the anchor bolt 32 indirectly interferes with the side frame 42 via the seat cover and the cushion pad. However, in the following description, the wording "indirectly" will be omitted when referring to interference between members.

[0097] In this manner, the anchor bolt 32 is restricted from moving outward in the vehicle width direction by interfering with the side frame 42. Therefore, compared to a case in which this embodiment is not applied, it is possible to suppress the seat belt stay 36 from collapsing outward in the vehicle width direction.

[0098] Here, the amount of outward tilt of the seat belt stay 36 in the vehicle width direction is reduced by improving the rigidity of the side frame 42 itself. Meanwhile, in this embodiment, the anchor bolt 32 abuts (interferes with) the side frame 42. Therefore, the amount of movement of the seat belt stay 36 is affected not only by the rigidity of the side frame 42 but also by the rigidity of the anchor bracket 30 to which the anchor bolt 32 is fastened, and accordingly, the amount of outward tilt of the seat belt stay 36 in the vehicle width direction can be reduced.

[0099] In this embodiment, as a collapse suppression function, triangular bead portions 72 that protrude toward the inside in the vehicle width direction are formed on the side frames 42. The formation of the triangular bead portions 72 improves the rigidity of the side frames 42 themselves. This reduces the collapse of the seat belt stays 36 toward the outside in the vehicle width direction in the event of a vehicle collision. The leakage is suppressed.

[0100] That is, in this embodiment, the triangular bead portion 72 is formed in the side frame 42, thereby improving the rigidity of the side frame 42 itself, and thus making it possible to suppress deformation of the side frame 42. As described above, when a load toward the outside in the vehicle width direction acts on the buckle device 22 during a vehicle collision, the load toward the outside in the vehicle width direction acts on the side frame 42 via the seat belt stay 36 of the buckle device 22.

[0101] As described above, in this embodiment, deformation of the side frame 42 itself is suppressed by improving the rigidity of the side frame 42 itself, so that when the seat belt stay 36 interferes with the side frame 42, the movement of the seat belt stay 36 can be restricted, making it possible to suppress the seat belt stay 36 from collapsing outward in the vehicle width direction.

[0102] In this embodiment, the rigidity of the side frame 42 itself can be improved, and conversely, by ensuring the same rigidity in the side frame 42, it is possible to make the side frame 42 itself thinner. Therefore, in this embodiment, it is possible to suppress an increase in mass in the vehicle seat 10 and suppress a decrease in the restraining force of the occupant due to the collapse of the buckle device 22 in the event of a vehicle collision.

[0103] Furthermore, in this embodiment, the anchor bolt 32 and the nut 34 are disposed at positions overlapping with the triangular bead portion 72 in a side view of the seat. Therefore, when a load toward the outside in the vehicle width direction acts on the buckle device 22 during a vehicle collision, the anchor bolt 32 interferes with the triangular bead portion 72 of the side frame 42. In other words, the anchor bolt 32 interferes with a portion of the side frame 42 that has high rigidity, and therefore it is possible to further suppress the seat belt stay 36 from collapsing toward the outside in the vehicle width direction.

[0104] Thus, in this embodiment, the anchor bolt 32 is positioned so as to overlap with the triangular bead portion 72 when viewed from the side of the seat, thereby further preventing the seat belt stay 36 from collapsing outward in the vehicle width direction compared to a case in which this embodiment is not applied.

[0105] Meanwhile, in this embodiment, the side frame 42 includes a side frame main body 70 and a patch member 74, and the patch member 74 is joined to the outer side in the vehicle width direction of the side frame main body 70. In addition, the patch member 74 forms closed cross-sectional portions 76, 80 between itself and the side frame main body 70.

[0106] In this way, by providing the patch member 74 on the side frame main body 70, the rigidity of the side frame 42 itself can be improved compared to a case in which the patch member 74 is not provided, although this is not shown in the drawings. Furthermore, since the patch member 74 forms closed cross-sectional portions 76, 80 between the side frame main body 70 and the patch member 74, the rigidity of the side frame 42 itself can be further improved compared to a case in which the patch member 74 is simply joined to the side frame main body 70.

[0107] In this embodiment, the flange portion 78A, which is part of the joint where the side frame main body 70 and the patch member 74 are joined, is provided at a position overlapping with a substantially central portion 72A of the triangular bead portion 72 in a side view of the seat. Since the triangular bead portion 72 is formed in the side frame main body 70 so as to protrude toward the inside in the vehicle width direction, the substantially central portion 72A of the triangular bead portion 72 is more easily deformed than the outer edge portion of the triangular bead portion 72.

[0108] For this reason, in this embodiment, the flange portion 78A where the side frame main body 70 and the patch member 74 are joined is provided at a position overlapping with the approximate center portion 72A of the triangular bead portion 72 in a side view of the seat. This makes it possible to improve the rigidity of the triangular bead portion 72, and as a result, the rigidity of the side frame 42 itself can be further improved.

[0109] Furthermore, the triangular bead portion 72 is connected to a lower end bead portion 70B formed at the lower end of the side frame 42, and forms a triangular shape in a side view of the seat. For example, although not shown, in comparison with a case in which the triangular bead portion 72 is provided independently in the center portion in the vertical direction of the side frame 42, in this embodiment, the rigidity of the triangular bead portion 72 itself can be improved, and the rigidity of the side frame 42 itself can be improved.

[0110] 8 to 10, in this embodiment, the vehicle seat 10 is provided with a lifter mechanism 18, and the seat cushion 12 (see FIG. 1) moves up and down relative to the slide rails 16. For this reason, the anchor bolt 32 is disposed at a position overlapping any one of the upper end bead portion 70A, the triangular bead portion 72, and the lower end bead portion 70B formed on the side frame 42 protruding toward the inside in the vehicle width direction in the seat side view, regardless of the vertical position of the seat cushion 12.

[0111] As a result, in this embodiment, even if a load toward the outside in the vehicle width direction acts on the side frame 42 via the seat belt stay 36 during a vehicle collision, the anchor bolt 32 interferes with any of the upper end bead portion 70A, the triangular bead portion 72, or the lower end bead portion 70B of the side frame 42. As a result, the anchor bolt 32 is restricted from moving toward the outside in the vehicle width direction. In other words, in this embodiment, it is possible to further suppress the seat belt stay 36 from collapsing toward the outside in the vehicle width direction, regardless of the vertical position of the seat cushion 12.

[0112] 4, in this embodiment, the side frame 42 includes a side frame main body 70 and a patch member 74, and a flange portion 78A, which is a part of the joint where the side frame main body 70 and the patch member 74 are joined, is provided at a position overlapping with a substantially central portion 72A of the triangular bead portion 72 in a side view of the seat. Since the triangular bead portion 72 is formed in the side frame main body 70 so as to protrude toward the inside in the vehicle width direction, the substantially central portion 72A of the triangular bead portion 72 is more easily deformed than the outer edge portion of the triangular bead portion 72.

[0113] Therefore, in this embodiment, by joining the flange portion 78A to a position that overlaps with approximately the central portion 72A of the triangular bead portion 72 when viewed from the side of the seat, the rigidity of the triangular bead portion 72 can be improved, and as a result, the rigidity of the side frame 42 itself can be further improved.

[0114] 2, in this embodiment, the triangular bead portion 72 protruding toward the inside in the vehicle width direction in the side frame 42 is formed so as to be connected to at least the lower end bead portion 70B provided at the lower end of the side frame 42. As a result, although not shown, in this embodiment, the rigidity of the triangular bead portion 72 itself can be improved compared to a case in which the triangular bead portion 72 is provided independently in the center portion in the up-down direction of the side frame 42, and the rigidity of the side frame 42 itself can be further improved.

[0115] In this embodiment, the anchor bracket 30 includes a fixing portion 30A, a vertical wall portion 30B, and a vertical wall portion 30C, and the vertical wall portion 30B is formed to be higher than the vertical wall portion 30C. Therefore, in this embodiment, as shown in FIG. 7, at the boundary portion 31 between the fixing portion 30A and the vertical wall portion 30B, A protruding portion 30D protruding outward in the vehicle width direction from the vertical wall portion 30B, and a protruding portion 30E protruding upward from the fixed portion 30A are provided.

[0116] In this manner, in this embodiment, by forming the protrusions 30D, 30E at the boundary 31 between the fixing portion 30A and the vertical wall portion 30B, the rigidity of the anchor bracket 30 itself can be improved compared to a case in which the protrusions 30D, 30E are not formed, although this is not shown in the drawings. This makes it possible to suppress deformation of the anchor bracket 30 itself to which the seat belt stay 36 is attached.

[0117] In the present embodiment, in the manufacturing method of the anchor bracket 30, as a first step, the anchor bolt 32 is inserted into a through hole 86 formed on one 84A side of a sheet metal member 84, and the anchor bolt 32 is welded (fixed) to the one 84A side. Next, as a second step, on the one 84A side of the sheet metal member 84, starting from a position Q spaced from a boundary portion 88 on the other 84B side of the sheet metal member 84, the one 84A side of the sheet metal member 84 is bent so as to face the other 84B side of the sheet metal member 84. In this way, the anchor bracket 30 is formed.

[0118] For example, although not shown, when welding the anchor bolt 32 after bending, it is necessary to secure a gap on the anchor bracket 30 side for welding the anchor bolt 32, and it becomes necessary to consider manufacturing problems of the welding torch. In contrast, in this embodiment, the anchor bolt 32 is fixed to the sheet metal member 84 before bending, so such manufacturing problems do not occur. Therefore, in this embodiment, it is possible to secure the degree of freedom in design that prioritizes the performance required in the event of a vehicle collision.

[0119] In this embodiment, as a collapse prevention function, the anchor bolt 32 is positioned at a position overlapping with the side frame 42 when viewed from the side of the seat, and further, a triangular bead portion 72 protruding toward the inside in the vehicle width direction is formed on the side frame 42. However, it is not necessarily necessary to apply both, and applying only one of them can further prevent the seat belt stay 36 from collapsing outward in the vehicle width direction in the event of a vehicle collision.

[0120] 8 to 10, the anchor bolt 32 is disposed at a position overlapping any one of the upper end bead portion 70A, the triangular bead portion 72, and the lower end bead portion 70B of the side frame 42 in a side view of the seat, regardless of the vertical position of the seat cushion 12 (see FIG. 1). However, for example, when comparing the vertical positions of the seat cushion 12 at the lower most position shown in FIG. 8 and the upper most position shown in FIG. 10, the seat belt stay 36 at the upper most position overlaps with the side frame 42 in a side view of the seat. On the other hand, at the lower most position, the seat belt stay 36 does not overlap with the side frame 42 in a side view of the seat.

[0121] In other words, if a load acting outward in the vehicle width direction acts on the seat belt stay 36 in the event of a vehicle collision, the seat cushion 12 does not interfere with the side frame 42 at the lower most position, compared to when the seat cushion 12 is at the upper most position, so the moment acting on the seat belt stay 36 is larger and the amount of outward collapse in the vehicle width direction increases accordingly. In other words, it is sufficient to reduce the amount of outward collapse of the seat belt stay 36 in the vehicle width direction at least at the lower most position of the seat cushion 12.

[0122] 12, the anchor bolt 32 may be arranged at a position overlapping the triangular bead portion 72 or the lower end bead portion 70B of the side frame 42 at the lowermost position of the seat cushion 12. Although not shown, when the seat cushion 12 is in the uppermost position, the anchor bolt 32 does not overlap with the side frame 42 in a side view of the seat. On the other hand, the seat belt stay 36 overlaps with the side frame 42 in a side view of the seat, and therefore, due to interference with the side frame 42, the amount by which the seat belt stay 36 falls outward in the vehicle width direction is reduced.

[0123] In addition, in this modification, the vertical wall portion 90A constituting the anchor bracket 90 does not need to be made taller, unlike the vertical wall portion 30B of the anchor bracket 30 shown in Fig. 8. For this reason, as shown in Fig. 13, a protrusion 90C protruding upward from the fixed portion 90B (the surface on which the fixed portion 90B is formed) is provided at the boundary portion 91 between the fixed portion 90B and the vertical wall portion 90A on the inner angle side formed between the fixed portion 90B and the vertical wall portion 90A. In other words, in this modification, since the height of the vertical wall portion 90A is lower than the vertical wall portion 30B of the anchor bracket 30 shown in Fig. 8, it is not necessary to provide a protrusion on the vertical wall portion 90A side.

[0124] In addition, the present invention can be implemented in various modifications without departing from the spirit and scope of the present invention. Furthermore, the scope of the present invention is not limited to the above-described embodiment. [Explanation of symbols]

[0125] 10 Vehicle seats 12 Seat cushion 16 Slide rail 18 Lifter mechanism 20 Seatbelt 22 Buckle device 30 Anchor bracket (bracket) 30A Fixing part (bracket) 30B Vertical wall section (bracket) 30D Protrusion (bracket) 30E Protrusion (bracket) 32 Anchor bolt 36 Seat belt stay (buckle device) 38 Buckle (buckle device) 39 Tongue plate (buckle device) 40 Seat cushion frame 42 Side frame (anti-collapse function) 70 Side frame body (side frame) 70A Upper end bead (Bead, collapse prevention function) 70B Bottom bead (Bead, collapse prevention function) 72 Triangular bead section (bead section, collapse prevention function) 72A Approximately the center (approximately the center of the bead) 74 Patch material (side frame) 76 Closed section 78A Flange part (joint) 80 Closed section 84 Sheet metal parts 84A One side (one side of sheet metal part) 84B Other side (other side of sheet metal member) 88 Boundary 90 Anchor bracket (bracket) 90A Vertical wall section (bracket) 90B Fixing part (bracket) 90C Protrusion (bracket) 91 Boundary Q Position (Away from the Boundary)

Claims

1. A seat cushion frame, which is a framework of a seat cushion on which an occupant sits, includes a side frame that is disposed on the outer side in the seat width direction and on the inner side in the vehicle width direction and extends in the front-rear direction of the seat; a bracket fixed to a slide rail provided on a vehicle body floor and enabling the seat cushion to slide in a front-rear direction of the seat; an anchor bolt that is disposed on the inner side of the side frame in a vehicle width direction and fastened to the bracket to attach a seat belt stay that constitutes a part of a buckle device of a seat belt to the bracket; A collapse suppression function that is formed between the side frame and the anchor bolt and suppresses the collapse of the seat belt stay outward in the vehicle width direction in the event of a vehicle collision; A vehicle seat frame structure comprising:

2. The vehicle seat frame structure according to claim 1 , wherein the anchor bolt is disposed at a position overlapping with the side frame in a side view of the seat, to function as the collapse prevention function.

3. 3. The vehicle seat frame structure according to claim 1, wherein the side frames are provided with bead portions that protrude inward in a vehicle width direction to serve as the collapse suppression function.

4. The vehicle seat frame structure according to claim 3 , wherein the anchor bolt is disposed at a position overlapping with the bead portion in a side view of the seat.

5. 5. The vehicle seat frame structure according to claim 4, wherein a lower edge bead portion protruding toward an inner side in a vehicle width direction is formed at least at a lower edge portion of the side frame, and the lower edge bead portion is formed so as to be connected to the bead portion.

6. The side frame is A side frame main body that constitutes the outer shape of the side frame; a patch member joined to an outer side of the side frame body in a vehicle width direction and having a closed cross-sectional portion formed between the patch member and the side frame body; The vehicle seat frame structure according to any one of claims 1 to 5, comprising:

7. 7. The vehicle seat frame structure according to claim 6, wherein a portion of a joint where the side frame main body and the patch member are joined is provided in a position overlapping with approximately a center of a bead portion that is formed on the side frame main body so as to protrude toward an inside in the vehicle width direction, in a side view of the seat.

8. a lifter mechanism for moving the seat cushion up and down relative to the slide rail; The vehicle seat frame structure according to any one of claims 1 to 7, wherein the anchor bolt is positioned so as to overlap with a bead portion that protrudes toward the inside in the vehicle width direction at the side frame when viewed from the side of the seat, regardless of the vertical position of the seat cushion.

9. The bracket is A fixing portion fixed to an upper end of the slide rail and formed substantially horizontally; The anchor bolt is fastened to the fixing portion on the inner side in the vehicle width direction. A vertical wall portion, a protruding portion formed to protrude toward an inner angle formed between the fixing portion and the vertical wall portion; The vehicle seat frame structure according to any one of claims 1 to 8, comprising:

10. A method for manufacturing a bracket according to any one of claims 1 to 9, A first step of fixing the anchor bolt to one side of a bent sheet metal member in a state where the other side is erected relative to one side of the sheet metal member; a second step of bending one side of the sheet metal member from a position away from a boundary portion with the other side of the sheet metal member as a starting point so as to face the other side of the sheet metal member; A method for manufacturing a bracket having the above structure.

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