JP2019206330A - Seat back frame - Google Patents

Abstract

To provide a seat back panel which achieves reduction of its weight while maintaining and improving rigidity in a vehicle seat.SOLUTION: A seat back frame 10 includes a panel material 20 and a frame material 30 joined to at least an outer periphery edge part of the panel material 20. The frame material 30 is formed into an open cross section form having a hat shaped cross section and including plane parts 33A, 34A. A pair of side wall parts 33B, 34B standing from the plane parts 33A, 34A to the panel material 20 is formed so as to become wider toward the panel material 20. Steps 33C, 34C are respectively formed at the side wall parts 33B, 34B.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seat back frame in a vehicle seat.

Conventionally, a seat back frame in a vehicle seat is configured by using a panel material made of a substantially rectangular metal plate and a frame material formed in a frame shape and joined to the panel material. (See, for example, Patent Document 1).
In addition, as the weight of vehicles progresses in order to improve fuel efficiency, the weight of vehicle seats is also required.

Japanese Patent No. 6245294

By the way, in the seat back panel as described in Patent Document 1, since the frame material composed of a metal pipe such as steel is arranged along the outer peripheral edge of the panel material, The contact area between the tubular shape and the flat panel material is small, and the rigidity of the entire seat back frame may not be sufficient.
In addition, if pipes are used for the frame material of the seat back frame, the seat back frame becomes heavy, and in the described seat back panel, the side frame and the lower frame are not connected, so the weight of the vehicle seat cannot be reduced. There is a case.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a seat back panel capable of reducing the weight while maintaining and improving the rigidity of a vehicle seat.

In order to solve the above problems, the invention described in claim 1
A seat back frame comprising a panel material and a frame material joined to at least the outer peripheral edge of the panel material,
The frame material has a cross-sectional hat-shaped open cross-sectional shape having a flat surface portion, and a pair of side wall portions raised from the flat surface portion toward the panel material becomes wider toward the panel material. And the step is formed on each of the side wall portions.

  According to a second aspect of the present invention, in the seat back frame according to the first aspect, the lower frame material which is the frame material joined to the lower end portion of the panel material and extending in the left-right direction, and the left and right sides of the panel material It is characterized by comprising a connection bracket for connecting the side frame material which is the frame material joined to the end portion and extending in the vertical direction.

  According to a third aspect of the present invention, in the seat back frame according to the second aspect, the connection bracket is configured such that each end portion contacting the lower frame material and the side frame material is separated from the panel material. It is set as the protruding convex part, and the center part is made into the recessed part depressed toward the said panel material side, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, in the seat back frame according to the third aspect, the concave portion of the connection bracket is formed to be recessed in an oval shape.

  According to a fifth aspect of the present invention, in the seat back frame according to any one of the second to fourth aspects, the connecting bracket protrudes toward the panel material at an end portion, and the panel material. The nail | claw part joined with is formed.

  The invention according to claim 6 is the seat back frame according to any one of claims 1 to 5, wherein the upper frame material joined to the upper end of the panel material and extending in the left-right direction is A portion that intersects with the frame material that is joined to the panel material and extends in the vertical direction is curved along the outer shape of the frame material that extends in the vertical direction.

  According to a seventh aspect of the present invention, in the seat back frame according to the sixth aspect, the upper frame material is disposed so as to straddle at least one frame material extending in the vertical direction. Features.

  The invention according to claim 8 is the seat back frame according to claim 7, wherein the upper frame material has a bulging portion that bulges away from the panel material.

  According to a ninth aspect of the present invention, in the seat back frame according to the seventh or eighth aspect, a headrest is attached to the upper frame material, and the headrest has an opening at least on a lower surface side. It is characterized by.

  A tenth aspect of the present invention is the seat back frame according to any one of the first to ninth aspects, wherein the panel material is formed with beads in a plurality of geometric shapes. It is characterized by.

  The invention according to claim 11 is the seat back frame according to claim 10, wherein the beads are arranged so that the geometric shape is symmetrical in the vertical direction.

  According to a twelfth aspect of the present invention, in the seat back frame according to the tenth or eleventh aspect, a hole is formed in a central portion of the geometric shape of the bead.

The invention according to claim 13 is the seat back frame according to any one of claims 10 to 12,
The panel material is divided into a plurality of sections by the frame material joined to the panel material and extending in the vertical direction,
The plurality of geometric shapes of the beads in the respective sections are arranged at positions shifted in the vertical direction in the adjacent sections.

According to the first aspect of the present invention, the side wall portion of the frame material having a hat-shaped cross section is formed so as to become wider toward the panel material, and the step is formed on each side wall portion, thereby reducing the weight of the frame material. However, sufficient rigidity can be obtained.
Therefore, it is possible to reduce the weight of the seat back frame using the frame material and the vehicle seat configured using the frame material while maintaining and improving the rigidity.

  According to the second aspect of the invention, the rigidity of the corner portion of the seat back frame, particularly the rigidity against torsion can be improved.

  According to the third aspect of the present invention, the lower frame material and the side frame material are sandwiched between the projection of the connection bracket and the panel material, and the lower frame material and the side frame material are securely connected by the connection bracket. It becomes possible to do. Therefore, it is possible to further improve the rigidity of the corner portion of the seat back frame.

  According to the invention described in claim 4, the formability of the connection bracket is improved, and the connection bracket can be easily welded to the panel material.

  According to the fifth aspect of the present invention, the connecting bracket can be accurately and easily joined to the panel material.

  According to invention of Claim 6, it becomes possible to make them cross | intersect in a flat state, without making the part which an upper frame material and other frame material cross | intersect forward rise, and they are combined firmly It becomes possible. Therefore, the rigidity of the seat back frame can be further improved.

  According to the invention described in claim 7, since the upper frame material is arranged so as to straddle the frame material, rather than dividing the upper frame material into two pieces and arranged on the left and right of the frame material, Compared with the case where the upper frame material is divided into two, the rigidity of the seat back frame can be further improved because the upper frame material is composed of one piece.

  According to the eighth aspect of the present invention, it is possible to further improve the rigidity of the upper frame material by providing the upper frame material with the bulging portion that bulges away from the panel material.

  According to the ninth aspect of the present invention, since the headrest has the opening on at least the lower surface side, the headrest can be reduced in weight, and the seat back frame can be reduced in weight. . Further, since the headrest can be formed by pressing, it can be formed at a lower cost and lighter.

  According to the invention described in claim 10, by forming the bead on the panel material, the panel material is hardly deformed, and the rigidity of the panel material can be increased and the rigidity of the seat back frame can be improved.

  According to the eleventh aspect, the rigidity of the panel material can be further improved, and the rigidity of the seat back frame can be improved.

  According to the twelfth aspect of the invention, it is possible to reduce the weight of the panel material while maintaining the rigidity of the panel material by the beads, and it is possible to reduce the weight of the seat back frame.

  According to the invention of the thirteenth aspect, it is possible to further improve the rigidity of the panel material with respect to twisting and bending, and it is possible to further improve the rigidity of the seat back frame.

It is a front view showing the composition of the seat back frame concerning this embodiment. It is a front view showing the structure of the seat back frame arrange | positioned in the position which the bead shifted in the up-down direction in each division. (A) It is a figure showing the structure of the side frame material which concerns on this embodiment, and is sectional drawing which follows XX in (B) (A). (A) It is a figure showing the structure of the lower frame material which concerns on this embodiment, or a middle frame material, (B) It is sectional drawing which follows YY in (A). (A)-(D) It is sectional drawing showing the structure of Comparative Examples 1-4. It is a perspective view showing the structure of the connection bracket which concerns on this embodiment. It is a top view of the upper frame material of a part for two persons among seat back frames. It is a perspective view showing the state which contacted and attached the headrest pillar to the concave curved surface formed in the front surface of an upper frame material. (A) It is the perspective view showing the structural example of a headrest, (B) It is the figure which looked at the headrest of (A) from the slightly lower side. (A) It is a figure showing the figure which looked at another structural example of the headrest from the slightly lower side, (B) It is a top view of the headrest of (A). It is a side view of the headrest of Drawing 10 (A). (A) It is a perspective view of the structural example of a striker, (B) It is sectional drawing of the attachment part of the striker of (A). (A) It is a disassembled perspective view of the attachment structure of the striker of another structural example, (B) It is sectional drawing of the attachment part of the striker of (A). It is a perspective view showing another example of composition of a striker, its attachment structure, etc.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are provided with various technically preferable limitations for carrying out the present invention. However, the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Absent.

FIG. 1 is a front view illustrating a configuration of a seat back frame according to the present embodiment. Although illustration is omitted, the seat back frame 10 constitutes a seat back of a vehicle seat provided in a vehicle interior.
Although illustration is omitted, the seat back is configured such that a cushion pad is disposed in front of the seat back frame 10 and is covered with a skin. And the seating area | region of the passenger | crew who seats on a vehicle seat is divided | segmented by attaching an unevenness | corrugation to a cushion pad or attaching the seam of an outer skin.

FIG. 1 shows a case where the vehicle seat is a three-seater rear seat and the seat back is separated into a two-seat part and a one-seat part. In some cases, the seat back is not separated (that is, the panel member 20 described later is a single panel member).
The present invention is also applicable to a case where the seat back is not separated into a two-seat part and a one-seat part and is formed as a single three-seat (or two-seat) seat back. Applied. Further, the present invention is also applied to a seat back frame of a seat for a vehicle for one person.

Furthermore, in the following, the direction will be described based on directions (front and rear, left and right, up and down) when the traveling direction of the vehicle is the front.
In FIG. 1, the seat cushion or the like at the center portion of the seat back can swing forward about the shaft members 50, 50 provided at the lower end, and the armrest can be used as an armrest when it is tilted forward. The case where it is configured to be functional is shown.

The seat back frame 10 includes a panel material 20 and a frame material 30 joined to an outer peripheral edge portion or the like of the panel material 20.
The panel material 20 (also referred to as a pan frame) is a metal plate such as steel or aluminum alloy, and is formed in a rectangular shape when viewed from the front. The panel material 20 is arranged so that each side of the rectangle faces in the left-right direction or the up-down direction.

Further, as the frame material 30, an upper frame material 31 and a lower frame material 32 extending in the left-right direction are respectively attached to the upper and lower ends of the front surface of the panel material 20 by being joined to the panel material 20. Side frame members 33, 33 extending in the vertical direction are attached to the left and right ends of the front surface of the member 20 by being joined to the panel member 20.
Further, middle frame members 34, 34, 34 extending in the vertical direction are attached to the panel member 20 and attached to the front surface of the panel member 20 between the side frames 33, 33.
The frame material 30 (31 to 34) will be described in detail later. These frame members 30 are joined to the panel member 20 by laser welding, which will be described later.

In the present embodiment, the panel material 20 is divided into a plurality of sections 20A to 20C by the side frame material 33 and the middle frame 34, and each of the sections 20A to 20C of the panel material 20 has a plurality of geometrical shapes. It is formed into a shape.
In addition, a bead is the structure of the protruding item | line (rail shape) comprised so that it might bulge ahead from the front surface of the panel material 20. FIG.

If the metal plate constituting the panel material 20 is in a flat state, deformation such as bending or bending is likely to occur. However, by forming the protruding bead 21 by plastic working, the panel material 20 is less likely to be deformed. The rigidity of the panel material 20 can be increased.
Further, in this embodiment, as shown in FIG. 1, the bead 21 is arranged so that its geometric shape (in this embodiment, a shape in which trapezoids are mainly combined) is symmetrical in the vertical direction. The rigidity of the material 20 is further improved.

Moreover, in this embodiment, the hole 22 is formed in the center part of the geometric shape of each bead 21, respectively.
With this configuration, it is possible to reduce the weight of the panel material 20 in a state where the rigidity of the panel material 20 by the beads 21 is maintained.

On the other hand, in FIG. 1, the plurality of geometric shapes of the beads 21 in the respective sections 20A to 20B of the panel material 20 are in the same position in the vertical direction in the adjacent sections (the sections 20A and 20B and the sections 20B and 20C). The case where it arrange | positions in this way is shown, and it is also possible to comprise in this way.
In addition, as shown in FIG. 2, the geometric shapes of the beads 21 in the respective sections 20A to 20B of the panel material 20 are shifted in the vertical direction from each other in the adjacent sections (the sections 20A and 20B and the sections 20B and 20C). It is also possible to arrange to be arranged at different positions.
If comprised in this way, it will become possible to improve the rigidity of the panel material 20 with respect to a twist or a bending more.

Note that the outer peripheral edge of the panel member 20 may be bent forward or backward to form an outer peripheral flange (not shown). If comprised in this way, it will become possible to improve the rigidity of the panel material 20 further.
Further, as described above, below the central section 20B of the panel member 20, the shaft member 50 serving as a swing shaft when the seat cushion or the like at the center portion of the seat back is swung forward to form an armrest. , 50 are attached.

In this embodiment, the frame material 30 (31-34) is formed with metals, such as steel and an aluminum alloy.
And the frame material 30 (32-34) is made into the open cross-sectional shape of the cross-sectional hat shape which has a plane part, and a pair of side wall part raised toward the panel material 20 from the plane part is the panel material 20. It is formed so that it becomes wider as it goes to, and a step is formed on each side wall.
This will be specifically described below.

In the present embodiment, the side frame member 33 has an open cross-sectional shape with a cross-sectional hat shape, as shown in FIGS. And it has the plane part 33A and a pair of side wall parts 33B and 33B raised from the plane part 33A toward the panel material 20, and the side wall parts 33B and 33B are widened toward the panel material 20. It is formed to become.
Steps 33C and 33C are formed on the side wall portions 33B and 33B of the side frame member 33, respectively. Further, flange portions 33D and 33D for joining the side frame member 33 to the panel member 20 are formed at the end portions of the side wall portions 33B and 33B, respectively.

In the present embodiment, the lower frame material 32 and the middle frame material 34 are also formed in an open cross-sectional shape having a hat-shaped cross section, as shown in FIGS. In FIGS. 4A and 4B, the case of the middle frame material 34 is shown as a representative example, but the lower frame material 32 is similarly configured.
The pair of side wall portions 34B and 34B raised from the flat surface portion 34A toward the panel material 20 are formed so as to increase in width toward the panel material 20, and steps 34C and 34C are formed, respectively. Yes. Further, flange portions 34D and 34D are formed at the end portions of the side wall portions 34B and 34B, respectively.

However, unlike the case of the side frame member 33, the middle frame member 34 (lower frame member 32) is configured such that the heights of the steps 34C and 34C from the panel member 20 are different from each other.
The middle frame member 34 and the lower frame member 32 can also be configured so that the heights of the steps 34C and 34C from the panel member 20 are the same as the side frame member 33. Further, the side frame member 33 can be configured such that the heights of the steps 33C and 33C from the panel member 20 are different from each other, and an appropriate structure is appropriately selected as the structure of the frame member 30.

Table I shows a result of comparison between the case where the frame material 30 is configured as described above (Example) and the case where the frame material 30 is configured in another shape (Comparative Examples 1 to 4).
In addition, as an Example, what was comprised like the side frame material 33 shown to FIG. 3 (A), (B) was used, and as Comparative Examples 1-4, it is to FIG. 5 (A)-(D). Those having the cross-sectional shape shown are used, and the material is a general cold rolled steel plate (SPCC). The torsional stiffness was measured as the secondary pole moment. 5A to 5D show cross-sectional shapes, and actual values of thickness and the like are not reflected.

As can be seen from the above results, the frame material 30 (example) according to the present embodiment has a thinner plate thickness (0.6 mm) and a lighter weight than the comparative examples 1 to 4 (0.189 kg). ), A section modulus (bending strength) and torsional rigidity equivalent to or better than those of Comparative Examples 1 to 4 can be obtained. Even if the frame member 30 is configured as shown in FIGS. 4A and 4B, the same good results can be obtained.
And the frame material 30 is joined and attached to the panel material 20 by laser welding via flange part 33D (34D).

Therefore, the seat back frame 10 according to the present embodiment using the frame material 30 as described above can achieve weight reduction and maintain rigidity or further improvement.
Further, a vehicle seat configured using such a seat back frame 10 can also be reduced in weight while maintaining and improving rigidity.

By the way, when the lower frame member 32 as described above is joined to the lower end portion of the panel member 20 and the side frame member 33 is joined to the left and right end portions of the panel member 20, they are connected to the left and right corners on the lower side of the panel member 20. If it is configured to be surely connected at the portion, the rigidity of the corner portion of the seat back frame 10, particularly the rigidity against torsion, can be further improved.
Therefore, as shown in FIG. 1, it is possible to provide a connection bracket 40 for connecting the lower frame material 32 and the side frame material 33 at the left and right corners on the lower side of the panel material 20.

The connection bracket 40 connects not only the portion where the lower frame material 32 and the side frame material 33 are connected, but also the connection between the lower frame material 32 and the middle frame material 34 as shown as 40A in FIG. It can also be provided in the part.
It is also possible to provide a connection bracket 40 at a portion where the upper frame material 31 and the side frame material 33 and the middle frame material 34 are connected.

The connection bracket 40 is made of metal, and as shown in FIG. 6, a convex portion 41 that protrudes forward (that is, a direction away from the panel material 20, the same applies hereinafter) to either the left or right (left side in FIG. 6) end portion. , And a convex portion 42 protruding forward is provided at the upper end portion.
Further, the connecting bracket 40 has a concave portion 43 whose central portion is recessed toward the panel material 20 side (that is, rearward). In this embodiment, the recessed part 43 of the connection bracket 40 is formed so as to be recessed in an oval shape.
In addition, a claw portion 44 that protrudes toward the panel material 20 is formed at an end portion of the connection bracket 40.

Positioning pins (not shown) are provided at the corners of the panel member 20, and these pins are inserted into the positioning holes 45 provided in the recesses 43 of the connection bracket 40 to connect the connection bracket 40. When the back surface side of the recess 43 is brought into contact with the panel material 20, the pin and the hole 45 are engaged, and the connection bracket 40 is positioned with respect to the panel material 20.
When the back side of the concave portion 43 of the connection bracket 40 is brought into contact with the panel material 20, the convex portion 41 of the connection bracket 40 comes into contact with the lower frame material 32, and as shown in FIG. Thus, the lower frame member 32 is sandwiched between the two. Further, the convex portion 42 of the connecting bracket 40 comes into contact with the side frame material 33, and the side frame material 33 is sandwiched between the convex portion 42 and the panel material 20.
Further, when the back side of the recess 43 of the connection bracket 40 is brought into contact with the panel material 20, the claw portion 44 of the connection bracket 40 comes into contact with the panel material 20.

  Therefore, by joining the concave portion 43 and the claw portion 44 of the connection bracket 40 to the panel material 20 by laser welding, the connection bracket 40 is joined to the panel material 20 and the convex portions 41 and 42 of the connection bracket 40 are the panel material. Since the lower frame member 32 and the side frame member 33 are sandwiched between the lower frame member 32 and the lower frame member 20, the lower frame member 32 and the side frame member 33 can be reliably connected by the connecting bracket 40.

Further, since the lower frame member 32 and the side frame member 33 are securely connected at the corners of the panel member 20, the rigidity of the corners of the seat back frame 10, particularly the rigidity against torsion, can be further improved. .
Note that, as in the present embodiment, the recess 43 of the connection bracket 40 is formed to be recessed in an oval shape, thereby improving the moldability of the connection bracket 40 and easily laser welding the connection bracket 40 to the panel material 20. It becomes possible to do.

On the other hand, in the present embodiment, the upper frame material 31 has a U-shaped cross section having a flange portion as shown in FIG. 5A so that necessary components such as the headrest pillar holding portion 51 can be easily attached as will be described later. Is formed.
However, the upper frame material 31 is also configured as shown in FIGS. 3A, 3B, 4A, and 4B, similarly to the lower frame 32, the side frame 33, the middle frame 34, and the like. Is also possible.

The upper frame material 31 is formed of a metal such as steel or an aluminum alloy, and is configured as shown in FIG. 7 in the present embodiment.
FIG. 7 is a plan view of the upper frame member 31 of the seat back frame 10 where two people are seated.
This will be specifically described below.

As shown in FIG. 1, the upper frame material 31 intersects the side frame material 33 and the middle frame material 34 at the upper end of the front surface of the panel material 20.
Therefore, the upper frame material 31 is configured such that portions AC intersecting with the side frame material 33 and the middle frame material 34 are curved forward along the outer shape of the side frame material 33 and the middle frame material 34. .
In FIG. 7, symbol A represents a portion where the upper frame material 31 and the side frame material 33 intersect, and symbols B and C represent portions where the upper frame material 31 and the middle frame material 34 intersect.

If comprised in this way, it will become possible to cross | intersect in flat state, without raising the parts AC which the upper frame material 31, the side frame material 33, and the middle frame material 34 cross | intersect forward.
Further, since the upper frame material 31 is curved along the outer shape of the side frame material 33 and the middle frame material 34, the upper frame material 31 and the side frame material 33 and the middle frame material 34 are joined by laser joining or the like. Thus, they can be firmly coupled, and the rigidity of the seat back frame 10 can be further improved.

In addition, in the portion indicated by the symbol B, the upper frame material 31 is not divided into two pieces and arranged on the left and right sides of the middle frame material 34, but is arranged so that one upper frame material 31 straddles the middle frame material 34. (See FIGS. 1 and 7).
If comprised in this way, compared with the case where the upper frame material 31 is divided | segmented into two, since the upper frame material 31 is comprised by one, it will become possible to improve rigidity, and the rigidity of the seat back frame 10 will be improved more It becomes possible to make it.

Further, as shown in FIG. 1, a headrest pillar holding portion 51 for holding a headrest pillar of a headrest (not shown) may be attached to the upper frame material 31.
At this time, as shown in FIG. 7, the upper frame material 31 to which the headrest pillar holding portion 51 or the like is attached is bulged forward, and the headrest pillar holding portion 51 is attached to the bulging portion D, so that the upper The headrest pillar holding portion 51 and the like can be easily and accurately attached to the frame material 31. In addition, by providing the bulging portion D, the rigidity of the upper frame material 31 can be further improved.

Further, as shown in FIG. 1, the headrest pillar 52 may be directly attached to the upper frame material 31.
In this case, for example, as shown in FIG. 7, the front surface of the upper frame material 31 is recessed to form concave curved surfaces E, E, and the headrest pillar 52 is brought into contact with the concave curved surfaces E, E as shown in FIG. It can be configured to be attached by laser welding or the like.

If comprised in this way, compared with the case where the headrest pillar 52 is attached to the flat upper frame material 31 (namely, upper frame material 31 in which the recessed curved surfaces E and E are not formed), the upper frame material 31 and the headrest pillar 52 are provided. Increases the contact area.
Therefore, the headrest pillar 52 can be securely attached to the upper frame material 31.

In addition, although the case where the headrest pillar holding | maintenance part 51 and the headrest pillar 52 were attached to the upper frame material 31 was demonstrated above, for example, as shown to FIG. 9 (A) and (B), a headrest is attached to the upper frame material 31. It is also possible to configure to attach 60 directly.
In this case, the headrest 60 can be formed in a box shape in which the front face 61, the upper face 62, the side face 63, etc. are integrally formed by pressing or the like, for example, with a metal plate such as steel or aluminum alloy. Further, it is possible to provide a mounting portion 64 for the panel material 20 and mounting portions 65 and 65 for the upper frame material 31 on the rear side of the left and right side surfaces 63, respectively.

  Further, as shown in FIGS. 9A and 9B, for example, if the hole 66 is provided on the front surface 61 or the like of the headrest 60 or the opening 67 is provided on the lower surface side, the weight of the headrest 60 is reduced. Thus, the seat back frame 10 can be reduced in weight. Furthermore, since the headrest 60 can be formed by press working, it can be formed inexpensively and lightly.

Further, the headrest 60 may be configured as shown in FIGS. 10A and 10B and FIG. FIG. 10A is a view of the configuration example of the headrest 60 as seen from the slightly lower side, and FIG. 10B and FIG. 11 are a plan view and a side view of the configuration example of the headrest 60.
Also in the configuration example of the headrest 60, an opening 67 is provided on the lower surface side. A flange 68 extending inward is formed at the lower end portions of the front surface 61 and the left and right side surfaces 63. Thus, by forming the flange 68 inwardly at the lower ends of the front surface 61 and the left and right side surfaces 63 of the headrest 60, the rigidity of the headrest 60 can be improved.

In this configuration example, the headrest 60 is formed with notches 69 from the front surface 61 to the flange 68 and from the side surface 63 to the flange 68.
Thus, by providing the notch 69 from the front surface 61 or the side surface 63 of the headrest 60 to the flange 68, when the headrest 60 is bent to form the flange 68, wrinkles are prevented from occurring in the flange 68 portion and the like. It becomes possible to do. 10A shows the case where the notch 69 is provided on both the front surface 61 and the side surface 63 of the headrest 60. However, the notch 69 is provided only on the front surface 61 of the headrest 60 or only on the side surface 63. It is also possible to provide it. Further, the number of notches 69 provided on the front surface 61 and the side surface 63 is determined as appropriate.

Further, as shown in FIG. 10B and FIG. 11, it is possible to form a bead 71 at the connecting portion 70 between the upper surface 62 of the headrest 60 and the attaching portion 64 to the panel material 20. As shown in FIG. 11, the connecting portion 70 is formed so as to form an arc forward and upward from the mounting portion 64, and is continuous with the upper surface 62 of the headrest 60.
And the rigidity of the connection part 70 can be improved by forming the bead 71 in the connection part 70, for example by expanding several places of the connection part 70 upwards.

If the upper end of the bead 71 is higher than the upper end of the upper surface 62 of the headrest 60, the bead 71 may interfere with the operation when the headrest 60 is attached. It is desirable that the upper end be formed below the upper end of the upper surface 62 of the headrest 60.
Further, the welding jig positioning holes 72 (see FIG. 10B) provided on the upper surface 62 of the headrest 60 are provided in an appropriate number at appropriate positions on the upper surface 62.

  By the way, although not shown, if the hole or opening is provided in the portion of the upper frame member 31 to which the headrest 60 is attached, the seat back frame 10 can be further reduced in weight.

FIG. 1 shows a case where a seat belt attaching portion 53 for attaching a seat belt for an occupant seated in the center row of the vehicle seat is attached to the upper frame member 31.
The seat belt attachment portion 53 is attached to a predetermined attachment position F (see FIG. 7) of the upper frame material 31. At this time, in order to make it easy to attach the seat belt attachment portion 53, the seat belt attachment portion 53 is placed at the attachment position F of the upper frame material 31. It is also possible to provide a bulging part or a concave part.

On the other hand, in the present embodiment, strikers 54 and 56 are attached to the seat back frame 10. The strikers 54 and 56 are for maintaining the posture of the seat back frame 10 and the seat back by engaging with a lock mechanism (not shown) provided in the vehicle main body.
In the present embodiment, the strikers 54 and 56 are attached to the seat back frame 10 as follows.

12A is a perspective view of the striker 54, and FIG. 12B is a cross-sectional view of a mounting portion of the striker 54.
The striker 54 is formed by bending a single wire rod made of a metal round bar into a frame shape, and both end portions 54A and 54B are each formed into a flat plate shape by pressing.

As shown in FIG. 1 and FIG. 12B, the panel material 20 is formed with a notch 20a extending from the end of the panel material 20 to the lower side of the upper frame material 31. A reinforcing plate 55 is attached to the front surface side of the panel material 20 below the upper frame material 31 so as to cover the notches 20a. The reinforcing plate 55 may be formed integrally with the upper frame material 31 by extending the flange portion of the upper frame material 31 downward, for example.
The lower end portion 54A of the striker 54 is joined to the front surface of the reinforcing plate 55 by laser welding, and the striker 54 is inserted into the opening of the reinforcing plate 55 or the notch 20a of the panel material 20 to form the panel material. 20 extends backward.

Further, the upper portion of the striker 54 is routed forward from the rear of the panel material 20 through the notch 20a, and the upper end portion 54B is joined to the front surface of the upper frame material 31 by laser welding. Yes.
In this embodiment, the striker 54 is attached to the upper part of the seat back frame 10 so as to protrude rearward in this manner.

As will be described later, the end portion 54 </ b> B of the striker 54 is joined to the upper frame material 31 by laser welding from the back side of the upper frame material 31. At that time, when the upper frame material 31 is viewed from directly behind (that is, when viewed from the laser irradiation direction (the direction from the rear to the front)), the joining position of the end portion 54B of the striker 54 and the upper frame material 31 is determined. If it overlaps with the engaging portion 54C (see FIGS. 12A and 12B) of the striker 54 with the lock mechanism, it is difficult to irradiate the joining position with laser.
Therefore, in this embodiment, as shown in FIG. 1 and FIG. 12A, the upper end portion 54B of the striker 54 is inclined downward rather than downward. With this configuration, the joining position between the end portion 54B of the striker 54 and the upper frame material 31 does not overlap with the engaging portion 54C with the lock mechanism of the striker 54, and the laser is easily and accurately placed at the joining position. Irradiation is possible.

13A is an exploded perspective view of the attachment structure of the striker 56, and FIG. 13B is a cross-sectional view of the attachment portion of the striker 54.
Similar to the striker 54, the striker 56 is also formed by bending a single wire rod made of a metal round bar into a frame shape, and both end portions 56A and 56B are each formed into a flat plate shape by pressing.

An opening 20 b is provided in the upper part of the panel material 20.
In addition, the upper frame material 31 is formed with projecting portions 31b and 31b in which flange portions 31a corresponding to the opening portions 20b of the panel material 20 project in the vertical direction.

Then, as shown in FIG. 13B, the lower end portion 56A and the upper end portion of the striker 56 are formed on the front surfaces of the overhang portions 31b and 31b of the upper frame material 31 joined to the front surface of the panel material 20. 56B is joined to each other, and the striker 56 is inserted through the opening 20b of the panel material 20 and extends rearward of the panel material 20.
In this embodiment, the striker 56 is attached to the upper part of the seat back frame 10 so as to protrude rearward in this manner.

Note that the manner of attaching the strikers 54 and 56 to the seat back frame 10 is not limited to the manner of attachment in the present embodiment.
In addition, the structure of the strikers 54 and 56 is not limited to a structure in which a single wire made of a metal round bar is bent as in the present embodiment, and both ends are pressed to form a flat plate, Other structures can be employed.

For example, as shown in FIG. 14, a striker 57 is formed by bending a frame-shaped flat plate having an opening in the center, and a flange portion 57 </ b> B for attaching to the locking mechanism and a panel member 20 is provided. It is possible to configure.
And the notch 20c is provided in the panel material 20, the striker 57 is fitted in the notch 20c of the panel material 20, and the back side of the flange portion 57B is joined to the panel material 20, so that the striker 57 is attached to the panel material 20. It can be configured to be attached.

In this case, the upper frame member 31 (not shown) is attached from the front side of the panel member 20 to which the striker 57 is attached.
At that time, the panel material 20 is recessed by the thickness of the flange portion 57B of the striker 57, or the upper frame material 31 is recessed by the thickness of the flange portion 57B of the striker 57, so that the upper frame material 31 is It is desirable to configure so that the striker 57 is attached to the panel material 20 while being securely joined to the panel material 20.

In this way, the striker 57 can be attached to the upper part of the seat back frame 10 so as to protrude rearward.
And if it comprises in this way, since it becomes possible to form the striker 57 by press work, it becomes possible to form a striker cheaply and lightweight rather than forming with a metal round bar etc.

By the way, in the seat back frame 10 according to the present embodiment, since the thickness of the panel material 20 is reduced within a range that does not impair rigidity and the like for weight reduction, a laser is irradiated from the back side of the panel material 20 and laser welding is performed. Each member can be joined.
Therefore, although not illustrated, in the manufacturing process of the seat back frame 10 according to the present embodiment, each frame material 30 (upper frame material 31 and lower frame material 30) is applied to the panel material 20 in which the beads 21 and the holes 22 are formed. Frame material 32, side frame material 33, middle frame material 34, etc.) and connecting bracket 40, necessary parts (headrest pillar holding part 51 and headrest pillar 52 (or headrest 60), seat belt attaching part 53, strikers 54, 56, etc.) The seat back frame 10 is manufactured by arranging at predetermined positions using a jig (not shown), irradiating a laser from the back side of the panel material 20 and laser welding predetermined welding locations at once. It has become.

By comprising in this way, it becomes possible to weld each member with respect to the panel material 20 which has a comparatively large area rapidly and exactly.
In that case, for example, it is also possible to constitute so that arc welding etc. are used together with racer welding. In addition, when the panel material 20 is behind such as welding of the headrest pillar holding portion 51 to the upper frame material 31 and it becomes difficult to perform laser welding (or laser welding becomes impossible), a hole or a notch is formed in that portion of the panel material 20. Etc. may be provided as appropriate so that the panel material 20 does not interfere with laser welding.

Needless to say, the present invention is not limited to the above-described embodiment and the like, and can be appropriately changed without departing from the gist of the present invention.
For example, as long as the rigidity of the seat back frame 10 is not impaired, the panel material 20, the frame materials 30, the connection bracket 40, necessary parts, and the like are provided with holes and notches so as to reduce the weight. Is also possible.

DESCRIPTION OF SYMBOLS 10 Seat back frame 20 Panel material 20A-20C Section 21 Bead 22 Hole 30 Frame material 31 Upper frame material 32 Lower frame material 33 Side frame material (a side frame material, the frame material extended to an up-down direction)
33A, 34A Plane portion 33B, 34B Side wall portion 33C, 34C Step 34 Middle frame material (frame material extending in the vertical direction)
40 Connecting bracket 41, 42 Convex part 43 Concave part 44 Claw part 60 Headrest 67 Opening part D Swelling part

Claims (13)

A seat back frame comprising a panel material and a frame material joined to at least the outer peripheral edge of the panel material,
The frame material has a cross-sectional hat-shaped open cross-sectional shape having a flat surface portion, and a pair of side wall portions raised from the flat surface portion toward the panel material becomes wider toward the panel material. And a step is formed in each of the side wall portions.   A lower frame material which is the frame material joined to the lower end portion of the panel material and extends in the left-right direction; and a side frame material which is the frame material joined to the left and right end portions of the panel material and extends in the vertical direction; The seat back frame according to claim 1, further comprising a connection bracket for connecting the two.   The connecting bracket is a concave portion in which each end portion contacting the lower frame material and the side frame material protrudes in a direction away from the panel material, and a central portion is recessed toward the panel material side. The seat back frame according to claim 2, wherein   The seat back frame according to claim 3, wherein the concave portion of the connection bracket is formed to be recessed in an oval shape.   5. The connecting bracket according to any one of claims 2 to 4, wherein a claw portion that protrudes toward the panel material and is joined to the panel material is formed at an end portion. The described seat back frame.   The upper frame material joined to the upper end portion of the panel material and extending in the left-right direction is a frame in which a portion intersecting the frame material joined to the panel material and extending in the up-down direction extends in the up-down direction. The seat back frame according to any one of claims 1 to 5, wherein the seat back frame is curved along an outer shape of the material.   The seat back frame according to claim 6, wherein the upper frame material is disposed so as to straddle at least one of the frame materials extending in the vertical direction.   The seat back frame according to claim 7, wherein the upper frame member has a bulging portion that bulges in a direction away from the panel member.   The seat back frame according to claim 7 or 8, wherein a headrest is attached to the upper frame member, and the headrest has an opening at least on a lower surface side.   The seat back frame according to any one of claims 1 to 9, wherein a bead is formed in a plurality of geometric shapes in the panel material.   The seat back frame according to claim 10, wherein the beads are arranged so that the geometric shape is symmetrical in the vertical direction.   The seat back frame according to claim 10 or 11, wherein a hole is formed in a central portion of the geometric shape of the bead. The panel material is divided into a plurality of sections by the frame material joined to the panel material and extending in the vertical direction,
13. The plurality of geometric shapes of the beads in each of the sections are arranged at positions shifted in the vertical direction from each other in the adjacent sections. The seat back frame as described in.

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