Sheet frame

Abstract

To improve a working efficiency in attaching a pressure receiving member to receive a load of an occupant.SOLUTION: A seat frame 1 includes a lower frame 13 that couples a lower part of each of side frames 12 respectively disposed on right and left sides. The lower frame 13 includes a rear wall part 13A disposed backward, and a front wall part 13B disposed ahead of the rear wall part 13A. An attachment part 51, which attaches a pressure receiving member 15 to support an occupant, is disposed on the front wall part 13B. Working efficiency in attaching the pressure receiving member 15 is enhanced because the attachment part 51 is disposed on the front wall part 13B.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a seat frame including a lower frame to which a pressure-receiving member for receiving the load of an occupant can be attached.

Background Art

[0002] A seat frame forming the skeleton of a seat mounted on a vehicle such as an automobile may be provided with a pressure-receiving member for receiving the load of an occupant. For example, in Patent Document 1 below, the pressure-receiving member is attached to the rear wall of a lower frame that connects the lower portions of left and right side frames.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, a rotating shaft for rotatably connecting a seat back frame and a seat cushion frame is provided in front of the rear wall of the lower frame, and the workability when attaching the pressure-receiving member to the lower frame is not high.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a seat frame with improved workability in attaching a pressure-receiving member for receiving the load of an occupant.

Means for Solving the Problems

[0006] According to the seat frame of the present invention, the above problems are solved by a seat frame including a lower frame that connects the lower portions of side frames arranged on the left and right, wherein the lower frame is provided at the rear , with the lower end bent forward with a rear wall portion, and provided in front of the rear wall portion , extending upward from the front end of the rear wall portion with a front wall portion, The open cross-section formed by the front wall portion and the rear wall portion, and has an attachment portion for attaching a pressure-receiving member that supports an occupant to the front wall portion. , a reclining rotation shaft is attached between the lower ends of the left and right side frames in a state of penetrating the left and right side frames, and the rear wall portion is provided such that the upper end of the rear wall portion is located above the upper end position of the rotation shaft This is solved by According to the above seat frame, the workability when attaching the pressure-receiving member to the lower frame can be improved.

[0007] Further, in the above seat frame, the pressure-receiving member has a support portion that supports the occupant and a connection portion that connects to both the support portion and the attachment portion, and the attachment portion is spaced apart from the support portion and is below the support portion. and is located below the upper end of the rear wall portion It may be provided. By doing so, the pressure-receiving member can be stably attached without impairing the seating comfort of the occupant.

[0008] Further, in the above seat frame, the attachment portion may be provided inside the left and right ends of the pressure-receiving member. , the connecting portion is a clip fitted to the mounting portion, and in a state where the clip is fitted to the mounting portion, the rear end of the clip is provided to be located below the upper end of the rear wall portion It may be provided. By doing so, the seat frame can be downsized. Also, in the above seat frame, the lower frame may be formed in a J-shaped cross-section by the rear wall portion and the front wall portion

[0009] Further, in the above seat frame, the front wall portion may have a first reinforcing portion extending in the seat width direction. By doing so, the rigidity of the front wall portion of the lower frame to which the pressure-receiving member is attached can be improved. Thereby, the attachment of the pressure-receiving member can be stabilized.

[0010] Further, in the above seat frame, it may have a second reinforcing portion provided at a position where the front wall portion and the rear wall portion are connected. By doing so, the rigidity of the lower frame to which the pressure-receiving member is attached can be improved.

[0012] Further, in the above seat frame, the first reinforcing portion and the second reinforcing portion may be provided at positions facing each other vertically. By doing so, the rigidity of the front wall portion of the lower frame to which the pressure-receiving member is attached can be improved. Thereby, the attachment of the pressure-receiving member can be stabilized.

[0013] Also, in the above seat frame, the attachment portion may be provided between the first reinforcing portion and the second reinforcing portion. By doing so, the rigidity around the attachment portion for attaching the pressure-receiving member in the seat frame can be improved.

[0014] Also, in the above seat frame, the end portion of the first reinforcing portion in the seat width direction may be located outside the seat width direction of the attachment portion facing the first reinforcing portion. By doing so, the rigidity against the load from the outside of the seat for the attachment portion to which the pressure-receiving member is attached can be improved.

[0015] Also, in the above seat frame, The seat frame is mainly composed of a seat back frame and a seat cushion frame. The seat back frame includes an upper frame, the side frames arranged on the left and right, and the lower frame. A headrest mounting portion is attached to the upper end of the upper frame, and an airbag unit is attached to the side portion of the side frame it may be 。

Advantages of the Invention

[0016] According to the present invention, the workability when attaching the pressure-receiving member to the lower frame can be improved.

[0017] According to one aspect of the present invention, the pressure-receiving member can be stably attached without impairing the seating comfort of the occupant.

[0018] According to one aspect of the present invention, the seat frame can be downsized.

[0019] According to one aspect of the present invention, the rigidity of the front wall portion of the lower frame to which the pressure-receiving member is attached can be improved.

[0020] According to one aspect of the present invention, the rigidity of the lower frame to which the pressure-receiving member is attached can be improved.

[0021] According to one aspect of the present invention, stable support for an occupant can be achieved.

[0022] According to one aspect of the present invention, the rigidity of the front wall portion of the lower frame to which the pressure receiving member is attached can be improved.

[0023] According to one aspect of the present invention, the rigidity around the attachment portion where the pressure receiving member is attached to the seat frame can be improved.

[0024] According to one aspect of the present invention, the rigidity of the attachment portion to which the pressure receiving member is attached against a load from the outside of the seat can be improved.

[0025] According to one aspect of the present invention, the rigidity of the front wall portion of the lower frame to which the pressure receiving member is attached can be improved.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 4

Figure 5A

Figure 5B

Figure 5C

Figure 6A

Figure 6B

Figure 6C

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12A

Figure 12B

Figure 12C

Figure 12D

Mode for Carrying Out the Invention

[0027] Hereinafter, based on FIGS. 1 to 12D, the seat frame 1 according to an embodiment of the present invention (hereinafter, this embodiment) will be described. The seat frame 1 forms the skeleton of a vehicle seat mounted on a vehicle. Note that the embodiments described below are merely examples for facilitating the understanding of the present invention and do not limit the present invention. That is, with respect to the shape, dimensions, arrangement, etc. of the members described below, they can be changed and improved without departing from the gist of the present invention, and it goes without saying that equivalents thereof are included in the present invention.

[0028] In the following description, the "front-rear direction" means the front-rear direction when viewed from the occupant of the vehicle seat, and is the direction that coincides with the traveling direction of the vehicle. The "seat width direction" means the lateral width direction of the vehicle seat, and coincides with the left-right direction when viewed from the occupant of the vehicle seat. Also, the "up-down direction" means the height direction of the vehicle seat, and coincides with the up-down direction when the vehicle seat is viewed from the front.

[0029] [1. Overview of the Seat Frame 1] First, with reference to FIG. 1, an overview of the configuration of the seat frame 1 will be described. As shown in FIG. 1, the seat frame 1 is mainly composed of a seat back frame 10 and a seat cushion frame 20. The seat back frame 10 forms the skeleton of the backrest portion in the seat frame 1, and the seat cushion frame 20 forms the skeleton of the seating portion in the seat frame 1.

[0030] As shown in FIG. 1, the seat back frame 10 includes an inverted U-shaped upper frame 11, a pair of side frames 12 that form the left and right ends in the seat width direction, and a lower frame 13 that connects the lower ends of the pair of side frames 12.

[0031] The upper frame 11 is welded to the side frame 12 at the upper frame side portions 11A that form the lower sides of both sides of the upper frame 11. Also, at the upper end of the upper frame 11, a headrest attachment portion 17 is attached by welding. The headrest attachment portion 17 is a tubular body through which two headrest stays hanging from a headrest (not shown) are inserted. Also, cross members 14 are installed at both ends above the upper frame side portions 11A of the upper frame 11. A recess 14A that is recessed above the seat more than the left and right is formed at the central portion of the cross member 14. The recess 14A may be provided between the left and right headrest attachment portions 17. In this way, in the seat frame 1, by forming the recess 14A in the cross member 14, the weight reduction of the seat frame 1 is achieved. Note that the recess 14A is formed at the lower end of the cross member 14, but it may also be formed at the upper end. Further, the recess 14A may be formed at both the upper end and the lower end of the cross member 14.

[0032] As shown in FIG. 1, a rotation shaft 16 of a reclining unit 40 is attached between lower end portions of left and right side frames 12 in a state of penetrating the left and right side frames 12. Note that by operating the reclining operation unit to operate the reclining unit 40, the angle of the seat back frame 10 with respect to the seat cushion frame 20 can be adjusted.

[0033] A pressure receiving member 15 for receiving a load from an occupant is installed at the center portion of the seat back frame 10. Here, the pressure receiving member 15 includes a support portion 15A, a wire 15B, and a wire 15C. The support portion 15A supports the back of the occupant and is constituted by an elastic member such as a leaf spring or an S spring. In the support portion 15A, the surface on the front side of the seat is referred to as a support surface. The wire 15B is locked to the support portion 15A and the front wall portion 13B of the lower frame 13, respectively. Specifically, the wire 15B is locked to the front wall portion 13B of the lower frame 13 using a clip 50 that fits into a through hole formed in the front wall portion 13B. The wire 15C is locked to the side end portion of the support portion 15A and the side frame 12, respectively. In this way, the support portion 15A is fixed to the seat back frame 10 by the wire 15B and the wire 15C.

[0034] Next, the seat cushion frame 20 will be described. As shown in FIG. 1, the seat cushion frame 20 has a rectangular frame-shaped outer shape when viewed from above. The seat cushion frame 20 mainly includes cushion side frames 22A and 22B respectively configured at left and right end portions in the seat width direction, a pan frame 21 configured at the front end portion of the seat cushion frame 20, and a connecting pipe 23 that connects the left and right cushion side frames 22A and 22B. For example, the connecting pipe 23 is a hollow member such as a round pipe, and the rear end of a pressure receiving member 24 that supports the buttocks of the occupant is attached thereto.

[0035] As shown in FIG. 1, a first connection bracket 18 is attached to the upper part of the rear end of the left cushion side frame 22A. The left side frame 12 is connected to the first connection bracket 18 via a reclining unit 40. Also, as shown in FIG. 4, a second connection bracket 19 is attached to the upper part of the rear end of the right cushion side frame 22B. The right side frame 12 is connected to the second connection bracket 19 via a reclining unit 40. Details of the configurations of the first connection bracket 18 and the second connection bracket 19 will be described later.

[0036] [2. Configuration of Side Frame 12] Next, the configuration of the side frame 12 will be described with reference to FIGS. 2, 3A, 3B, and 3C. FIG. 2 is a left side view of the seat back frame 10. FIG. 3A is an outer side view of the side frame 12, FIG. 3B is a rear view of the side frame 12, and FIG. 3C is an inner side view of the side frame 12.

[0037] As shown in FIGS. 2, 3A, and 3C, a plurality of through holes including an airbag mounting hole 31A, an airbag mounting hole 31B, an airbag mounting hole 31C, and a through hole 31D are formed in the side frame side portion 12A that constitutes the side portion of the side frame 12. The airbag mounting hole 31A, the airbag mounting hole 31B, and the airbag mounting hole 31C are through holes used for mounting the airbag unit. Here, the airbag unit includes an airbag body, a force cloth that guides the deployment direction of the airbag, a plate for airbag mounting, and the like. For example, the airbag mounting hole 31B and the airbag mounting hole 31C are holes for mounting the force cloth of the airbag, and the airbag mounting hole 31A is a hole through which a bolt extending from a retainer of the airbag body is inserted. The through hole 31D is formed at a position facing the lower end of the upper frame side portion 11A, and the side frame 12 and the upper frame 11 are welded at the through hole 31D.

[0038] As shown in FIGS. 2, 3A, and 3C, a first reinforcing portion 30A extending along the trailing edge 12C is formed on the side frame side portion 12A that constitutes the side portion of the side frame 12. Here, the trailing edge 12C is a bent portion that corresponds to the boundary between the side frame side portion 12A that forms the side surface of the side frame 12 and the side frame rear portion 12B that forms the rear surface. The first reinforcing portion 30A is configured, for example, as a bead portion formed by recessing a part of the side frame side portion 12A inward of the sheet by pressing. Here, the first reinforcing portion 30A is provided at least in the widest wide portion 12D in the side frame side portion 12A. In the present embodiment, the first reinforcing portion 30A is provided along the trailing edge 12C, from a position facing the through hole 31D in the vertical direction to a position facing the airbag mounting hole 31C. That is, the first reinforcing portion 30A is provided at least at a position where the side frame 12 and the upper frame side portion 11A overlap, thereby enhancing the strength of the joint portion between the side frame 12 and the upper frame 11. Note that the upper end of the first reinforcing portion 30A may be located above the welding position between the side frame 12 and the upper frame 11. Further, as shown in FIG. 2, the first reinforcing portion 30A is provided at a position that vertically overlaps the upper frame 11, the cushion side frames 22A, 22B in a side view.

[0039] As shown in FIGS. 2, 3A, and 3C, a second reinforcing portion 30B extending forward of the seat is formed on the side frame side portion 12A that constitutes the side portion of the side frame 12, from an intermediate position between the upper end and the lower end of the first reinforcing portion 30A. Similar to the first reinforcing portion 30A, the second reinforcing portion 30B is configured as a bead portion formed by recessing a part of the side frame side portion 12A inward of the sheet by pressing. Here, the second reinforcing portion 30B is formed between the airbag mounting hole 31A and the airbag mounting hole 31B. Note that the rear end of the second reinforcing portion 30B is connected to the first reinforcing portion 30A, and the two are integrated. And the front end of the second reinforcing portion 30B is located in front of the seat with respect to the airbag mounting hole 31B and behind the seat with respect to the front edge of the side frame side portion 12A.

[0040] As shown in FIGS. 2, 3A, and 3C, a third reinforcing portion 30C extending forward of the seat is formed from the lower end of the first reinforcing portion 30A on the side frame side portion 12A constituting the side portion of the side frame 12. Similar to the first reinforcing portion 30A, the third reinforcing portion 30C is configured as a bead portion in which a part of the side frame side portion 12A is recessed inside the seat by press working. Here, the third reinforcing portion 30C is formed between the airbag mounting hole 31A and the airbag mounting hole 31C. Note that the rear end of the third reinforcing portion 30C is connected to the first reinforcing portion 30A, and the two are integrated. And the front end of the third reinforcing portion 30C is located in front of the seat with respect to the airbag mounting hole 31C and behind the seat with respect to the front edge of the side frame side portion 12A.

[0041] Also, as shown in FIG. 2, with respect to the torso line T indicating the axis of the torso of the three-dimensional mannequin simulating an occupant sitting on the vehicle seat having the seat frame 1 as a skeleton, the second reinforcing portion 30B extends from the first reinforcing portion 30A at a substantially orthogonal angle (that is, a substantially right angle). On the other hand, the third reinforcing portion 30C extends from the first reinforcing portion 30A at an angle that is not orthogonal to the torso line T (that is, an acute angle). That is, the second reinforcing portion 30B and the third reinforcing portion 30C have different angles of extension from the first reinforcing portion 30A. In this way, by making the extension angles of the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C different from each other, the rigidity can be enhanced against load inputs from various directions. Also, the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C are each provided above the reclining unit 40 in the vertical direction.

[0042] Further, the bottom portions (i.e., the bottom portions of the beads) of the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C inside the seat are located outside the seat with respect to the end portions of the flanges provided in front of the side frame 12. Also, the upper end portion of the first reinforcing portion 30A may be made narrower in width than the lower end portion. Also, the front end portions of the second reinforcing portion 30B and the third reinforcing portion 30C may be made narrower in width than the rear portions. Also, the front end portions of the second reinforcing portion 30B and the third reinforcing portion 30C may be located in front of the front wall portion 13B of the lower frame 13, the support portion 15A of the pressure receiving member 15, the mounting portion of the reclining unit 40, the headrest mounting portion 17, and the rotating shaft 16. Also, the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C may all be located in front of the headrest mounting portion 17.

[0043] As shown in FIG. 3B, a rear surface reinforcing portion 30D is formed at the central portion of the side frame rear portion 12B of the side frame 12. Through holes 31E and 31F are formed in the upper and lower portions of the side frame rear portion 12B, respectively. The rear surface reinforcing portion 30D is configured as a bead portion formed by pressing a part of the side frame rear portion 12B inward of the seat. The rear surface reinforcing portion 30D extends from a position facing the upper end of the first reinforcing portion 30A to a position below the lower end of the first reinforcing portion 30A. Also, the upper end of the rear surface reinforcing portion 30D is located above the through hole 31E formed in the side frame rear portion 12B, and the lower end of the rear surface reinforcing portion 30D is located below the through hole 31F formed in the side frame rear portion 12B, so that the rear surface reinforcing portion 30D is formed. Here, the central portion of the rear surface reinforcing portion 30D located between the through hole 31E and the through hole 31F is a wide portion that is wider in width than the upper end and the lower end. Also, the lower end of the rear surface reinforcing portion 30D is at a position overlapping the lower frame 13 in the vertical direction. In this way, by forming the rear surface reinforcing portion 30D on the rear portion 12B of the side frame, the strength can be increased over a wide range of the rear portion 12B of the side frame.

[0044] As described above, by providing the inverted F-shaped bead portion in which the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C are integrally formed on the side portion 12A of the side frame 12, the strength over a wide range of the side portion 12A of the side frame can be improved in a well-balanced manner. Also, by providing the first reinforcing portion 30A along the trailing edge 12C, the strength of the trailing edge 12C can be increased. Also, the first reinforcing portion 30A is provided at least in the wide portion 12D of the side portion 12A of the side frame, so that the strength of the wide portion 12D can be increased even when various through holes for attaching components such as airbags are formed in the wide portion 12D. Also, by forming the airbag mounting hole 31A between the second reinforcing portion 30B and the third reinforcing portion 30C in the vertical direction, the strength around the airbag mounting hole 31A can be increased. Also, by providing the second reinforcing portion 30B between the airbag mounting hole 31A and the airbag mounting hole 31B, the strength around the airbag mounting hole 31A and the airbag mounting hole 31B can be increased. Also, by providing the third reinforcing portion 30C between the airbag mounting hole 31A and the airbag mounting hole 31C, the strength around the airbag mounting hole 31A and the airbag mounting hole 31C can be increased.

[0045] [3. Configuration of the First Connecting Bracket 18 and the Second Connecting Bracket 19] Next, the configurations of the first connecting bracket 18 and the second connecting bracket 19 will be described with reference to FIGS. 1, 4 to 6C.

[0046] FIG. 4 is a partially enlarged view of the periphery of the second connecting bracket 19 from the perspective IV in FIG. 1. FIGS. 5A, 5B, and 5C respectively correspond to the outer surface view, the rear view, and the inner surface view of the first connecting bracket 18. In addition, FIGS. 6A, 6B, and 6C respectively correspond to an outer side view, a rear view, and an inner side view of the second connection bracket 19.

[0047] As shown in FIGS. 5A, 5B, and 5C, the first connection bracket 18 is provided with a weak portion 18A, a shaft through hole 18B, a bolt fastening hole 18C, and a bolt fastening hole 18D. The weak portion 18A is provided between the shaft through hole 18B and the bolt fastening hole 18D and is a portion bent outward of the seat. When a load is input to the first connection bracket 18, it is easily deformed at the weak portion 18A. The shaft through hole 18B is where the rotating shaft 16 is inserted and the left reclining unit 40 is attached. The left side frame 12 is connected to the first connection bracket 18 via the left reclining unit 40. The left cushion side frame 22A is fixed to the bolt fastening holes 18C and 18D by fasteners such as bolts and nuts. For example, during a rear collision of the vehicle, the impact is absorbed by the deformation of the weak portion 18A of the first connection bracket 18.

[0048] As shown in FIGS. 6A, 6B, and 6C, the second connection bracket 19 is provided with a weak portion 19A, a shaft through hole 19B, a bolt fastening hole 19C, a bolt fastening hole 19D, and a weak portion 19E. The weak portion 19A is provided between the shaft through hole 19B and the bolt fastening hole 19D and is a portion bent outward of the seat. When a load is input to the second connection bracket 19, it is easily deformed at the weak portion 19A. The shaft through hole 19B is where the rotating shaft 16 is inserted and the right reclining unit 40 is attached. The right side frame 12 is connected to the second connection bracket 19 via the right reclining unit 40. The right cushion side frame 22B is fixed to the bolt fastening holes 19C and 19D by fasteners such as bolts and nuts. Further, the weak portion 19E is provided between the shaft through-hole 19B and the bolt fastening hole 19C, and is a portion bent outward of the seat. When a load is input to the second connecting bracket 19, it is likely to deform at the weak portion 19E. For example, during a rear collision of the vehicle, the impact is absorbed by the deformation of the weak portion 19A and the weak portion 19E of the second connecting bracket 19.

[0049] Regarding the weak portion 18A of the first connecting bracket 18, the first connection portion with the shaft through-hole 18B side and the second connection portion on the bolt fastening hole 18D side are located at substantially the same position in the seat width direction. That is, in the first connecting bracket 18, the first connection portion and the second connection portion are not offset in the seat width direction. On the other hand, regarding the weak portion 19A of the second connecting bracket 19, the second connection portion on the bolt fastening hole 19D side is located inside the seat in the seat width direction with respect to the first connection portion with the shaft through-hole 19B side. That is, in the second connecting bracket 19, the first connection portion and the second connection portion are offset in the seat width direction. Further, in the first connecting bracket 18, no weak portion is provided between the shaft through-hole 18B and the bolt fastening hole 18C. On the other hand, in the second connecting bracket 19, a weak portion 19E is provided between the shaft through-hole 19B and the bolt fastening hole 19C. In this way, by providing the weak portions asymmetrically in the first connecting bracket 18 and the second connecting bracket 19, the ease of deformation when a load is input to the seat frame 1 is changed.

[0050] As shown in FIG. 1, a height adjustment unit 41 is provided on the left cushion side frame 22A, and no similar component is provided on the right cushion side frame 22B. Therefore, a larger load is input to the first connecting bracket 18 connected to the left cushion side frame 22A than to the second connecting bracket 19 connected to the right cushion side frame 22B during a rear collision. On the other hand, in the seat frame 1, as described above, an asymmetric weak portion is provided in the first connecting bracket 18 and the second connecting bracket 19, and the second connecting bracket 19 is made more deformable than the first connecting bracket 18, so that the deformations of the first connecting bracket 18 and the second connecting bracket 19 can be adjusted to be of the same degree.

[0051] [4. Structure of the lower frame 13] Next, with reference to FIGS. 7 to 11, the structure of the lower frame 13 will be described. FIG. 7 is a front view of the seat frame 1 and is an enlarged partial view around the lower frame 13. FIG. 8 is a rear view of the seat frame 1 and is an enlarged partial view around the lower frame 13. FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 7, and FIG. 10 is a cross-sectional view taken along line X-X of FIG. 7. FIG. 11 is a view seen in the direction of the arrow from the viewing point XI of FIG. 7 and is an enlarged partial view of the lower frame 13.

[0052] As shown in FIGS. 7 to 11, the lower frame 13 includes a rear wall portion 13A formed in a J-shaped cross section that constitutes the rear part of the seat, and a front wall portion 13B that is continuously formed at the front end of the rear wall portion 13A and constitutes the front part of the seat.

[0053] [4.1. Structure of the front wall portion 13B of the lower frame 13] First, the structure of the front wall portion 13B of the lower frame 13 will be mainly described. As shown in FIGS. 7 and 9, the front wall portion 13B is a portion where the seat width portion facing the support portion 15A extends upward from the front end of the rear wall portion 13A. As shown in FIG. 7, a wire 15B with three clips 50 attached to the lower end is attached to the support portion 15A. And three attachment portions 51, which are through holes for fitting with the clips 50, are formed in the front wall portion 13B. As shown in FIG. 7, the attachment portion 51 is spaced apart from the support portion 15A and is provided below the support portion 15A. Also, the attachment portion 51 is provided inside the left and right ends of the support portion 15A. Then, by fitting the clip 50 attached to the wire 15B into the attachment portion 51 of the front wall portion 13B, the wire 15B is fixed to the front wall portion 13B.

[0054] As shown in FIG. 7, in the front wall portion 13B, upper reinforcing portions 60A, 60B, and 60C extending in the sheet width direction are formed above the attachment portion 51 of each clip 50. As shown in FIG. 7, the upper reinforcing portions 60A, 60B, and 60C are formed on substantially the same horizontal plane, with the upper reinforcing portion 60A provided on the left side, the upper reinforcing portion 60B provided in the center, and the upper reinforcing portion 60C provided on the right side. Note that the upper reinforcing portions 60A, 60B, and 60C are formed as bead portions obtained by pressing a part of the front wall portion 13B rearward in the sheet.

[0055] As shown in FIG. 7, the upper reinforcing portions 60A, 60B, and 60C are each formed in a shape along the upper edge of the front wall portion 13B. That is, the upper edge of the front wall portion 13B is linear at the center and arcuate at the left and right ends. Accordingly, the left end portion of the upper reinforcing portion 60A is arcuate and the rest is linear, the upper reinforcing portion 60B is linear, and the right end portion of the upper reinforcing portion 60C is arcuate and the rest is linear. Also, the position of the left end portion of the upper reinforcing portion 60A is located outside in the sheet width direction from the opposing attachment portion 51. Similarly, the position of the right end portion of the upper reinforcing portion 60C is located outside in the sheet width direction from the opposing attachment portion 51.

[0056] As shown in FIG. 7, below the attachment portion 51 that faces the upper reinforcing portion 60A at the boundary between the front wall portion 13B and the rear wall portion 13A, lower reinforcing portions 61A and 61B spaced apart from each other are formed. The lower reinforcing portions 61A and 61B are formed as bead portions obtained by pressing the boundary between the front wall portion 13B and the rear wall portion 13A rearward in the sheet. As shown in FIG. 7, the mounting portion 51 facing the upper reinforcing portion 60A is provided between the upper reinforcing portion 60A and the lower reinforcing portions 61A and 61B in the sheet vertical direction. Also, the position of the left end portion of the upper reinforcing portion 60A is located outside the sheet width direction than the lower reinforcing portion 61A. And the position of the right end portion of the upper reinforcing portion 60A is located outside the sheet width direction than the lower reinforcing portion 61B. That is, the lower reinforcing portions 61A and 61B are formed inside the sheet width direction with respect to the upper reinforcing portion 60A provided in the upper part. And the interval between the lower reinforcing portions 61A and 61B is shorter than the length in the width direction of the upper reinforcing portion 60A.

[0057] As shown in FIG. 7, below the mounting portion 51 facing the upper reinforcing portion 60B, which is the boundary portion between the front wall portion 13B and the rear wall portion 13A, the lower reinforcing portions 61C and 61D spaced apart from each other are formed. The lower reinforcing portions 61C and 61D are formed as bead portions obtained by recessing the boundary portion between the front wall portion 13B and the rear wall portion 13A rearward in the sheet by press working. As shown in FIG. 7, the mounting portion 51 facing the upper reinforcing portion 60B is provided between the upper reinforcing portion 60B and the lower reinforcing portions 61C and 61D in the sheet vertical direction. And the mounting portion 51 facing the upper reinforcing portion 60B is provided between the lower reinforcing portions 61C and 61D in the sheet width direction. Also, the position of the left end portion of the upper reinforcing portion 60B is located outside the sheet width direction than the lower reinforcing portion 61C. And the position of the right end portion of the upper reinforcing portion 60B is located outside the sheet width direction than the lower reinforcing portion 61D. That is, the lower reinforcing portions 61C and 61D are formed inside the sheet width direction with respect to the upper reinforcing portion 60B provided in the upper part. And the interval between the lower reinforcing portions 61C and 61D is shorter than the length in the width direction of the upper reinforcing portion 60B.

[0058] As shown in FIG. 7, below the attachment portion 51, which is the boundary portion between the front wall portion 13B and the rear wall portion 13A and faces the upper reinforcing portion 60C, lower reinforcing portions 61E and 61F spaced apart from each other are formed. The lower reinforcing portions 61E and 61F are formed as bead portions obtained by recessing the boundary portion between the front wall portion 13B and the rear wall portion 13A rearward of the sheet by press working. As shown in FIG. 7, the attachment portion 51 facing the upper reinforcing portion 60C is provided between the upper reinforcing portion 60C and the lower reinforcing portions 61E and 61F in the sheet vertical direction. Further, the position of the left end portion of the upper reinforcing portion 60C is located outside the sheet width direction than the lower reinforcing portion 61E. And the position of the right end portion of the upper reinforcing portion 60C is located outside the sheet width direction than the lower reinforcing portion 61F. That is, the lower reinforcing portions 61E and 61F are formed inside the sheet width direction with respect to the upper reinforcing portion 60C provided in the upper portion. And the interval between the lower reinforcing portion 61E and the lower reinforcing portion 61F is shorter than the length in the width direction of the upper reinforcing portion 60C.

[0059] Further, as shown in FIG. 7, the interval between the upper reinforcing portion 60A and the upper reinforcing portion 60B adjacent to each other on the upper side is shorter than the interval between the lower reinforcing portion 61B and the lower reinforcing portion 61C adjacent to each other on the lower side. Similarly, the interval between the upper reinforcing portion 60B and the upper reinforcing portion 60C adjacent to each other on the upper side is shorter than the interval between the lower reinforcing portion 61D and the lower reinforcing portion 61E adjacent to each other on the lower side.

[0060] For example, when attaching the pressure receiving member 15 to the front surface of the rear wall portion 13A, a rotating shaft 16 is provided between the rear wall portion 13A and the front wall portion 13B, and since the space is not sufficient, the attachment work of the pressure receiving member 15 is not easy. On the other hand, in the seat frame 1, by providing the attachment portion 51 for attaching the wire 15B of the pressure receiving member 15 to the front wall portion 13B of the lower frame 13, the rotating shaft 16 and the operator's hand do not interfere with each other, so the workability of attaching the pressure receiving member 15 can be improved.

[0061] [4.2. Configuration of the Rear Wall Portion 13A of the Lower Frame 13] Next, the configuration of the rear wall portion 13A of the lower frame 13 will be mainly described. As shown in FIG. 9, the upper end of the rear wall portion 13A is located above the upper end of the front wall portion 13B. Also, the lower end of the support portion 15A is above the upper end of the front wall portion 13B and below the upper end of the rear wall portion 13A. Also, as shown in FIG. 9, the front wall portion 13B is provided substantially parallel to the support portion 15A. Since the support portion 15A is substantially parallel to the torso line T, in other words, the front wall portion 13B is provided substantially parallel to the torso line T.

[0062] As shown in FIG. 8, upper protruding portions 75 that protrude upward are provided at the upper portions on both outer sides in the seat width direction of the rear wall portion 13A. The upper protruding portions 75 are formed in a shape along the side frame 12, and a reinforcing portion 74 is formed at a position facing the rear surface reinforcing portion 30D of the side frame 12. The reinforcing portion 74 is formed as a bead portion that is recessed in front of the seat and has a shape that engages with the rear surface reinforcing portion 30D. Note that both side portions of the rear wall portion 13A in the seat width direction are joined to the side frame 12 by welding.

[0063] According to the seat frame 1 according to the present embodiment described above, by providing the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C on the side frame side portion 12A of the side frame 12, the rigidity of the side frame 12 can be improved. Here, since the extending directions of the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C are different from each other, the rigidity against the input of loads from various directions can be improved.

[0064] Also, according to the seat frame 1, by providing the attachment portion 51 of the pressure receiving member 15 on the front wall portion 13B of the lower frame 13, the attachment workability of the pressure receiving member 15 can be improved. Also, by providing reinforcing portions vertically on the attachment portion 51 of the front wall portion 13B, the rigidity around the attachment portion 51 can be improved.

[0065] [5. Modification Example] The present invention is not limited to the above-described embodiments. Hereinafter, with reference to FIGS. 12A to 12D, a modification example of a reinforcing portion (bead shape) formed on the side frame side portion 12A of the side frame 12 will be described. FIGS. 12A to 12D each show an outer surface view of the side frame 12 according to the modification example.

[0066] First, the side frame 12 according to the first modification example will be described. As shown in FIG. 12A, in the side frame 12 according to the first modification example, a reinforcing portion 80A, a reinforcing portion 80B, a reinforcing portion 80C, a reinforcing portion 80D, and a reinforcing portion 80E are formed. Here, the reinforcing portion 80A, the reinforcing portion 80B, the reinforcing portion 80C, the reinforcing portion 80D, and the reinforcing portion 80E are each formed as a bead portion in which the side frame side portion 12A is recessed inward of the sheet by press working. The reinforcing portion 80A is provided along the trailing edge 12C of the side frame side portion 12A. The reinforcing portion 80B is provided so as to extend in the sheet front-rear direction between the airbag mounting hole 31A and the airbag mounting hole 31B. The reinforcing portion 80C is provided so as to extend in the sheet front-rear direction between the airbag mounting hole 31A and the airbag mounting hole 31C. The reinforcing portion 80D is provided so as to extend in the sheet front-rear direction below the airbag mounting hole 31C. The reinforcing portion 80E is provided along the leading edge of the side frame side portion 12A above the airbag mounting hole 31B.

[0067] As shown in FIG. 12A, it is possible to provide each of the reinforcing portion 80A, the reinforcing portion 80B, the reinforcing portion 80C, the reinforcing portion 80D, and the reinforcing portion 80E without connecting them to other reinforcing portions, and each as an independent bead portion. Further, the extending directions of the reinforcing portion 80A, the reinforcing portion 80B, the reinforcing portion 80C, the reinforcing portion 80D, and the reinforcing portion 80E may be different from each other.

[0068] Next, the side frame 12 according to the second modification will be described. As shown in FIG. 12B, in the side frame 12 according to the second modification, a reinforcing portion 81A, a reinforcing portion 81B, and a reinforcing portion 81C are formed. Here, the reinforcing portion 81A, the reinforcing portion 81B, and the reinforcing portion 81C are each formed as bead portions obtained by pressing the side frame side portion 12A inward of the sheet. The reinforcing portion 81A is provided along the trailing edge 12C of the side frame side portion 12A. However, the lower end of the reinforcing portion 81A is bent inward of the sheet. The reinforcing portion 81B is provided so as to extend in the front-rear direction of the sheet between the airbag mounting hole 31A and the airbag mounting hole 31B. Further, the rear end of the reinforcing portion 81B is connected to the reinforcing portion 81A. The reinforcing portion 81C is provided along the leading edge of the side frame side portion 12A above the airbag mounting hole 31B.

[0069] Next, the side frame 12 according to the third modification will be described. As shown in FIG. 12C, in the side frame 12 according to the third modification, a reinforcing portion 82A, a reinforcing portion 82B, a reinforcing portion 82C, and a reinforcing portion 82D are formed. Here, the reinforcing portion 82A, the reinforcing portion 82B, the reinforcing portion 82C, and the reinforcing portion 82D are each formed as bead portions obtained by pressing the side frame side portion 12A inward of the sheet. The reinforcing portion 82A is provided along the trailing edge 12C of the side frame side portion 12A. However, the lower end of the reinforcing portion 82A is bent inward of the sheet. The reinforcing portion 82B is provided so as to extend in the front-rear direction of the sheet between the airbag mounting hole 31A and the airbag mounting hole 31B. Further, the rear end of the reinforcing portion 82B is connected to the reinforcing portion 82A. The reinforcing portion 82C is provided so as to extend in the front-rear direction of the sheet from the bent portion of the reinforcing portion 82A toward the airbag mounting hole 31C. Further, the rear end of the reinforcing portion 82C is connected to the reinforcing portion 82A. The reinforcing portion 82D is provided along the leading edge of the side frame side portion 12A above the airbag mounting hole 31B.

[0070] Finally, the side frame 12 according to the fourth modification will be described. As shown in FIG. 12D, reinforcing portions 83A, 83B, and 83C are formed in the side frame 12 according to the fourth modification. Here, the reinforcing portions 83A, 83B, and 83C are each formed as bead portions obtained by pressing the side frame side portion 12A inwardly of the sheet. The reinforcing portion 83A is provided along the trailing edge 12C of the side frame side portion 12A. The reinforcing portion 83B is formed in an annular shape, and the rear end portion thereof is connected to the reinforcing portion 83A. The reinforcing portion 83B is formed between the airbag mounting hole 31A and the airbag mounting holes 31B and 31C, and encloses the airbag mounting hole 31A. The reinforcing portion 83C is provided along the leading edge of the side frame side portion 12A above the airbag mounting hole 31B.

Explanation of Reference Numerals

[0071] 1 Seat frame 10 Seat back frame 11 Upper frame 11A Upper frame side portion 12 Side frame 12A Side frame side portion 12B Side frame rear portion 12C Trailing edge 12D Wide portion 13 Lower frame 13A Rear wall portion 13B Front wall portion 14 Cross member 14A Recessed portion 15 Pressure receiving member 15A Support portion 15B Wire 15C Wire 16 Rotation shaft 17 Headrest mounting portion 18 First connection bracket 18A Weak portion 18B Shaft Through-Hole 18C Bolt Fastening Hole 18D Bolt Fastening Hole 19 Second Connecting Bracket 19A Weak Part 19B Shaft Through-Hole 19C Bolt Fastening Hole 19D Bolt Fastening Hole 19E Weak Part 20 Seat Cushion Frame 21 Pan Frame 22A, 22B Cushion Side Frame 23 Connecting Pipe 24 Pressure-Receiving Member 30A First Reinforcing Part 30B Second Reinforcing Part 30C Third Reinforcing Part 30D Rear Reinforcing Part 31A Airbag Mounting Hole 31B Airbag Mounting Hole 31C Airbag Mounting Hole 31D Through-Hole 31E Through-Hole 31F Through-Hole 40 Reclining Unit 41 Height Adjustment Unit 50 Clip 51 Mounting Part 52 Welded Part 60A Upper Reinforcing Part 60B Upper Reinforcing Part 60C Upper Reinforcing Part 61A Lower Reinforcing Part 61B Lower Reinforcing Part 61C Lower Reinforcing Part 61D Lower Reinforcing Part 61E Lower Reinforcing Part 61F Lower Reinforcing Part 74 Reinforcing Part 75 Upper Protruding Part 80A Reinforcing Part 80B Reinforcing Part 80C Reinforcing Part 80D Reinforcing Part 80E Reinforcing Part 81A Reinforcement part 81B Reinforcement part 81C Reinforcement part 82A Reinforcement part 82B Reinforcement part 82C Reinforcement part 82D Reinforcement part 83A Reinforcement part 83B Reinforcement part 83C Reinforcement part T Torso line

Claims

1. A seat frame including a lower frame that connects lower portions of left and right side frames, The lower frame is A rear wall portion provided at the rear and having a lower end bent forward; a front wall portion provided forward of the rear wall portion and extending upward from a front end of the rear wall portion; an open cross-section formed by the front wall portion and the rear wall portion, a mounting portion for mounting a pressure-receiving member for supporting an occupant on the front wall portion; A reclining rotation shaft is attached between the lower ends of the left and right side frames in a state where it penetrates the left and right side frames, The seat frame, wherein the rear wall portion is provided so that an upper end of the rear wall portion is positioned above an upper end position of the rotation shaft.

2. The pressure-receiving member is A support portion that supports the occupant; a connection portion connected to both the support portion and the mounting portion, 2. The seat frame according to claim 1, wherein the attachment portion is provided so as to be spaced apart from the support portion, below the support portion, and below an upper end of the rear wall portion.

3. The mounting portion is provided on the inner side of the left and right ends of the pressure-receiving member, the connecting portion is a clip that is fitted to the mounting portion, 3. The seat frame according to claim 2, wherein a rear end of the clip is positioned lower than an upper end of the rear wall portion when the clip is fitted to the mounting portion.

4. A seat frame as described in any one of claims 1 to 3, characterized in that the lower frame is formed with a J-shaped cross section by the rear wall portion and the front wall portion.

5. The seat frame according to any one of claims 1 to 4, wherein the front wall portion has a first reinforcing portion extending in the seat width direction.

6. 6. The seat frame according to claim 5, further comprising a second reinforcing portion provided at a position where the front wall portion and the rear wall portion are connected.

7. The seat frame according to claim 6 , wherein the first reinforcing portion and the second reinforcing portion are provided at positions opposed to each other vertically.

8. The seat frame according to claim 7 , wherein the attachment portion is provided between the first reinforcing portion and the second reinforcing portion.

9. The seat frame according to claim 8 , wherein an end portion in the seat width direction of the first reinforcing portion is located outward in the seat width direction from the mounting portion that faces the first reinforcing portion.

10. The seat frame is mainly composed of a seat back frame and a seat cushion frame, The seat back frame includes an upper frame, side frames arranged on the left and right, and a lower frame, A headrest mounting portion is attached to the upper end of the upper frame, 10. The seat frame according to claim 1, wherein an airbag unit is attached to a side portion of the side frame.

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