JP2022154848A - Seat frame and vehicle seat - Google Patents

Abstract

To provide a seat frame of a vehicle seat having a predetermined shape in which a reinforcement part having an appropriate shape is arranged and rigidity is improved.SOLUTION: A seat frame of a vehicle seat includes a back side frame 12 including: a side plate 12A; a front edge part 12B, a rear edge part, and a lower edge part 12D provided in a position crossing the side plate 12A; and a connection part 12E connecting the side plate 12A and each of the front edge part 12B, the rear edge part, and the lower edge part 12D. The front edge part 12B, the rear edge part, and the lower edge part 12D include a formation part having a predetermined shape. The formation part includes bending parts 40A, 41A, 42A having a curvature different from curvatures of other portions in the front edge part 12B, the rear edge part, and the lower edge part 12D.SELECTED DRAWING: Figure 4

Description

The present invention relates to a seat frame and a vehicle seat.

2. Description of the Related Art Conventionally, concave or convex beads are formed in automobile parts made of plate material such as steel in order to improve the rigidity of the parts (see, for example, Patent Document 1).

In Patent Document 1, in a seat back frame of a vehicle seat, a lever bracket provided on the upper end side of the seat back has a concave or convex bead portion in a fixing portion fixed to the seat back frame. It is described to increase stiffness.

Japanese Patent No. 6665727

The technique described in Patent Document 1 is to integrally form a bead portion together with a plate portion by press working or the like in order to increase the rigidity of the mounting seat (fixed portion) of the bracket member.
On the other hand, in the manufacture of a seat frame for a vehicle seat, the shape of the seat frame is more complicated, so the above technique cannot be applied as it is to the frame material that constitutes the seat frame. Therefore, there is a demand for a technique for arranging a reinforcing portion having an appropriate shape for a predetermined seat frame shape.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to improve the rigidity of a seat frame for a vehicle seat having a predetermined shape by arranging a reinforcing portion having an appropriate shape. is to provide
Another object of the present invention is to provide a vehicle seat having a seat frame in which a reinforcing portion having an appropriate shape is arranged to improve rigidity.

According to the seat frame of the present invention, the seat frame of the vehicle seat includes a first surface portion, a second surface portion provided at a position intersecting the first surface portion, and the first surface. and a connecting portion that connects the second surface portion to the second surface portion, the second surface portion having a forming portion having a predetermined shape, the forming portion having a shape other than that of the second surface portion. A solution is to include a curved portion having a curvature different from the curvature of the portion.

Thus, since the second surface portion intersecting the first surface portion of the seat frame has a forming portion including a curved portion having a curvature different from that of the other portions of the second surface portion, the curved portion is reinforced. It functions as a part and can improve the rigidity at the part where the two planes of the seat frame intersect.

At this time, it is preferable that the forming portion has a substantially semicircular shape when viewed from the front of the second surface portion.

Further, it is preferable that the forming portion has a concave shape when viewed from the front of the first surface portion.

Further, the connection portion has a second formation portion having a predetermined shape, and the second formation portion has a protruding portion whose end on the first surface portion side protrudes beyond the surface of the first surface portion. It is preferable to have

Moreover, it is preferable that the connecting portion has a third formation portion having a predetermined shape, and the third formation portion has a concave bead.

Further, it is preferable that the first surface portion is provided with a concave bead portion.

In each of the above configurations as well, the protruding portion, the concave bead and the bead portion function as reinforcing portions, respectively. The rigidity of the entire frame is improved.

Further, it is preferable that the frame member is a back side frame forming a seat back of the vehicle seat, and the forming portion is provided above a reclining device of the vehicle seat.
With the above configuration, when a predetermined load or more is applied in the event of a rear-end collision of the vehicle, the backside frame buckles starting from the forming portion formed in the backside frame. This improves the safety of the occupant in the event of a rear-end collision.

A vehicle seat includes any one of the seat frames described above, a pad material placed on the seat frame, and a skin material covering the seat frame and the pad material. , is preferred.
Accordingly, it is possible to provide a vehicle seat having a seat frame in which a reinforcing portion having an appropriate shape is arranged to improve rigidity.

ADVANTAGE OF THE INVENTION According to this invention, in the seat frame of the vehicle seat which has a predetermined shape, a reinforcement part of appropriate shape can be arrange|positioned and rigidity can be improved.
Further, according to the present invention, it is possible to improve the safety of the seated occupant in the event of a rear-end collision.
Further, according to the present invention, it is possible to provide a vehicle seat having a seat frame with improved rigidity.

1 is an external perspective view of a vehicle seat according to this embodiment; FIG. It is a perspective view of a seat frame according to the present embodiment. It is an outside side view of a backside frame. It is an inner side view of a backside frame. It is a front view of a back side frame. It is a rear view of a back side frame. It is a perspective view of a backside frame. It is a bottom view of a backside frame. FIG. 5 is an end view of a section cut along the line VI-VI of FIG. 4; FIG. 4 is a partial perspective view of a back side frame; It is a top view of a bending part. It is a sectional view of a bending part. It is explanatory drawing which shows the positional relationship of a formation part and a reclining apparatus.

A vehicle seat S and a seat frame 1 according to embodiments of the present invention will be described below with reference to FIGS. 1 to 9. FIG.
The vehicle seat S is a seat mounted in a vehicle of an automobile, and the seat frame 1 forms a framework of the vehicle seat S. As shown in FIG.
The embodiments described below are merely examples for facilitating understanding of the present invention, and do not limit the present invention. That is, the shape, size, arrangement, etc. of the members described below can be changed and improved without departing from the scope of the present invention, and the present invention naturally includes equivalents thereof.

In the following description, the term "longitudinal direction" means the longitudinal direction when viewed from a person seated in the vehicle seat, and is the direction that coincides with the running direction of the vehicle. "Left-right direction", "seat right side", and "seat left side" mean the left-right direction, the right side, and the left side when viewed from the occupant of the vehicle seat. The "seat width direction" means the width direction of the vehicle seat, and coincides with the left-right direction when viewed from the person seated in the vehicle seat. Further, the "vertical direction" means the height direction of the vehicle seat, and coincides with the vertical direction when the vehicle seat is viewed from the front.

First, referring to FIGS. 1 and 2, the overall configuration of the vehicle seat S and the seat frame 1 will be described.
As shown in FIG. 1, the vehicle seat S includes a seat back S1, a seat cushion S2, and a headrest S3. The seat back S1 is a backrest portion that supports the back of the seated person from behind. Constructed by covering. The seat cushion S2 is a seating portion that supports the seated person from below. configured as follows. The headrest S3 is a head that supports the head of the seated person from the rear. It is configured.

The seat frame 1 forms a skeleton of the vehicle seat S. As shown in FIG.
As shown in FIG. 2, the seat frame 1 mainly includes a seat back frame 10 and a seat cushion frame 20. As shown in FIG. The seat back frame 10 forms the skeleton of the seat back S1, and the seat cushion frame 20 forms the skeleton of the seat cushion S2.

The seat back frame 10 includes an inverted U-shaped upper frame 11, a pair of left and right back side frames 12 forming ends in the seat width direction, and a lower frame 13 connecting the lower ends of the pair of left and right back side frames 12. and are the main constituent elements.

The upper frame 11 extends in the seat width direction, has upper frame side portions 11A extending downward on both sides in the seat width direction, and is welded to the back side frame 12 at the upper frame side portions 11A. A tubular headrest attachment portion 17 is attached to the upper end of the upper frame 11 by welding. Two headrest stays S<b>3 c hanging down from the headrest S<b>3 are inserted through the headrest mounting portion 17 . A cross member 14 is provided over the upper frame side portion 11A of the upper frame 11 .

A central portion of the seat back frame 10 is provided with a pressure receiving member 15 that receives a load from the seated person and supports the back of the seated person. The pressure-receiving member 15 has its rear surface locked by two wires 15A extending in the vertical direction. , is attached to the seat back frame 10 . An airbag device 50 is attached to one of the left and right back side frames 12 on the outer surface in the seat width direction.

A reclining device 60 for adjusting the angle of the seatback frame 10 with respect to the seat cushion frame 20 is provided at the lower ends of the left and right back side frames 12 . is connected to the rear end of the seat cushion frame 20 . A rotating shaft 61 of a reclining device 60 is attached between the lower ends of the left and right back side frames 12 so as to pass through the left and right back side frames 12 .

The seat cushion frame 20 has a substantially rectangular frame shape when viewed from above. The seat cushion frame 20 includes a pan frame 21 forming a front end portion of the seat cushion frame 20, a pair of left and right cushion side frames 22 forming end portions in the seat width direction, and rear end portions of the left and right cushion side frames 22. A connecting member 23 to be connected is used as a main component. The pan frame 21 is made of a plate-like member, and the connecting member 23 is made of a hollow member such as a round pipe.

A central portion of the seat cushion frame 20 is provided with a pressure receiving member 25 that supports the buttocks of the seated person. A wire 25</b>A that supports the pressure receiving member 25 has a front end locked to the pan frame 21 and a rear end attached to the connecting member 23 .

Next, the configuration of the back side frame 12 will be described with reference to FIGS. 3A to 3D.
3A is an outer side view of the backside frame 12 disposed on the right side of the vehicle seat S as seen from the seat occupant, FIG. 3B is an inner side view of the backside frame 12, and FIG. 3C is the backside frame. 12, and FIG. 3D is a rear view of the backside frame 12. FIG. In the following description, the back side frame 12 arranged on the right side of the seat will be described as an example, but the back side frame 12 arranged on the left side of the seat is also symmetrical, It has similar characteristics.

The back side frame 12 is a frame member that is formed by pressing a sheet metal and that is a curved plate that is wider at the bottom than at the top. As shown in FIGS. 3A to 3D, the back side frame 12 includes substantially flat side plates 12A as frame side portions, and the front end portions of the side plates 12A are bent inward into a substantially U-shaped or substantially L-shaped cross section. a rear edge portion 12C formed by bending the rear end portion inward to have a substantially L-shaped cross section; and a lower end portion formed by bending the lower end portion inward to have a substantially L-shaped cross section. edge 12D. The back side frame 12 further has connecting portions 12E between the side plate 12A and the front edge portion 12B, the rear edge portion 12C, and the lower edge portion 12D, which connect the side plate 12A and each edge portion ( 4 and 5).

In other words, the side plate 12A serves as the first surface portion forming the first surface (e.g., side surface) of the back side frame 12, and the front edge portion 12B, the rear edge portion 12C, and the lower edge portion 12D each serve as the back side frame. In the case of a second surface portion forming 12 second surfaces (for example, one of the front surface, the rear surface, and the bottom surface), the first surface portion and the second surface portion are provided to intersect each other, and the first surface portion and the second surface portion, that is, at the intersecting portion, there is a connection portion that connects them. Thus, the back side frame 12 has a first surface portion, a second surface portion provided at a position intersecting the first surface portion, and a connection portion connecting the first surface portion and the second surface portion. is configured as

The back side frame 12 is curved so that the lower portion is wider than the upper portion when viewed from the side, and the central portion is the widest in the vertical direction. A portion of the back side frame 12 where the width of the side plate 12A in the front-rear direction is the widest, that is, the portion where the end portion on the side of the front edge portion 12B bulges most forward is referred to as a maximum bulging portion 12G.

The side plate 12A that constitutes the side portion of the back side frame 12 is provided with a recessed bead portion 30 that is recessed inward of the seat on the outer surface of the side plate 12A. The bead portion 30 functions as a reinforcing portion that reinforces the side plate 12A, thereby improving the rigidity of the back side frame 12. As shown in FIG. In this embodiment, the concave bead portion 30 includes two vertically aligned beads extending substantially parallel in the front-rear direction, a vertically extending bead connecting one ends of these two beads to each other, and a downwardly extending bead. It comprises a bead extending downward from the other end of the arranged bead.

Further, the side plate 12A constituting the side portion of the backside frame 12 has an airbag mounting hole 31A and an airbag mounting hole 31B for mounting the airbag device 50, and guides the deployment of the airbag to control the deployment direction. A webbing attachment hole 32A and a webbing attachment hole 32B for fixing the webbing to be attached are formed. The airbag mounting hole 31A and the airbag mounting hole 31B are substantially circular through holes through which bolts extending from the airbag body are inserted. The webbing attachment holes 32A and the webbing attachment holes 32B are substantially rectangular through holes through which attachment members fixed to ends of the webbing are inserted.

As shown in FIG. 3B, the airbag mounting hole 31A and the webbing mounting hole 32A are located at the same position in the front-rear direction (overlapping position in the vertical direction), that is, at the same position as the curved portion 41A as a forming portion described later. It is provided so as to be arranged in a vertical line. In addition, the airbag mounting holes 31B and the webbing mounting holes 32B are arranged at the same positions in the front-rear direction (positions overlapping in the vertical direction) as the curved portions 42A as forming portions to be described later, that is, arranged in the same substantially vertical line. It is set up like this.

The trailing edge portion 12C is formed with a recessed portion 33 that is recessed forward of the seat on the rear surface of the trailing edge portion 12C. The concave portion 33 functions as a reinforcing portion that reinforces the rear edge portion 12C. The recess 33 is a recessed bead. In this embodiment, the bead extends vertically, and the width of the bead at the center is wider than that at the top and bottom of the recess 33 .

Next, with reference to FIGS. 4 to 9, forming portions provided on the back side frame 12 will be described.
FIG. 4 is a perspective view of the back side frame 12 disposed on the right side of the vehicle seat S as viewed from the seat occupant, viewed from the right front and lower side, and FIG. 5 is a bottom view of the back side frame 12. FIG. 6 is an end view of a section cut along the line VI-VI of FIG. 4, FIG. 7 is a partial perspective view of the back side frame 12 as viewed from the right rear lower side, FIG. 8A is a plan view of a curved portion as a forming portion, 8B is a cross-sectional view of the bending portion, and FIG. 9 is an explanatory diagram showing the positional relationship between the forming portion and the reclining device 60. As shown in FIG.

The back side frame 12 has a forming portion having a predetermined shape as described below. The formed portion is formed to have a predetermined shape by press working, functions as a reinforcing portion, and improves the rigidity of the back side frame.

As shown in FIGS. 4 and 5, the front edge portion 12B of the back side frame 12 is bent inward at the lower portion of the back side frame 12 so as to form a substantially L-shaped cross section, and is attached to the side plate 12A. intersect at substantially right angles to each other. Two places on the front edge portion 12B, specifically, slightly below the maximum bulging portion 12G of the back side frame 12 and near the boundary between the front edge portion 12B and the lower edge portion 12D, are the front as the second surface portion. A protruding portion 40 and a protruding portion 41 are formed by protruding the edge portion 12B further forward. The front edge portion 12B includes the projecting portion 40 and the projecting portion 41, and the projecting portion 40 and the projecting portion 41 also correspond to the second surface portion.

A curved portion 40A and a curved portion 41A having curved surfaces are formed as forming portions (first forming portions) on the surfaces of the protruding portions 40 and 41, that is, on the front surfaces thereof. The curved portion 40A and the curved portion 41A are portions curved with a curvature different from the curvature of the surfaces forming the other portions of the projecting portion 40 and the projecting portion 41 .
Specifically, as shown in FIG. 8A, the curved portion 40A and the curved portion 41A have a concave shape when viewed from the side plate 12A side, that is, when the side plate 12A is viewed from the front. The curved portions 40A and 41A, which are forming portions, are curved with a curvature different from that of other portions (portions other than the curved portions 40A and 41A) of the projecting portions 40 and 41 . Further, as shown in FIG. 8B, the curved portion 40A and the curved portion 41A have a concave cross-sectional shape, and other portions (portions other than the curved portion 40A and the curved portion 41A) of the projecting portion 40 and the projecting portion 41 ) are curved with different curvatures.

The curved portion 40A and the curved portion 41A are formed in a substantially semicircular shape when the curved portion 40A and the curved portion 41A are viewed from the front of the seat, that is, when the projecting portion 40 and the projecting portion 41 are viewed from the front. Although FIG. 4 does not show the shape of the curved portion 40A and the curved portion 41A in a front view, the curved portion 42A described later has the same shape as the curved portion 40A and the curved portion 41A. , the curved portion 41A is formed in a substantially semicircular shape in a front view (when viewed from below the seat).

A curved portion 42A and a curved portion 43A as forming portions are similarly formed in the lower edge portion 12D and the rear edge portion 12C of the back side frame 12, respectively. As shown in FIG. 5, the lower edge portion 12D as the second surface portion is bent inward so as to form a substantially L-shaped cross section, intersects the side plate 12A at a substantially right angle, and protrudes forward. It has a protruding portion 42 . The projecting portion 42 also corresponds to the second surface portion. A curved portion 42A is formed on the surface of the projecting portion 42, that is, the lower surface.

As shown in FIG. 7, the rear edge portion 12C as the second surface portion is bent inward so as to form a substantially L-shaped cross section and intersects the side plate 12A at a substantially right angle. A curved portion 43A is formed on the surface of the rear edge portion 12C, that is, the rear surface. Note that the characteristics such as the shape and structure of the curved portion 42A and the curved portion 43A are the same as those of the curved portions 40A and 41A described above, so description thereof will be omitted.

Thus, the front edge portion 12B, the rear edge portion 12C, and the lower edge portion 12D have curved shape forming portions with different curvatures. By providing a forming portion having a curved shape at each edge portion that intersects with the side plate 12A, an uneven shape is formed in the bent portion. The curved portion 40A, the curved portion 41A, the curved portion 42A, and the curved portion 43A function as reinforcing portions, and the rigidity of the back side frame 12 is improved.

A connection portion 12E provided between the side plate 12A and the rear edge portion 12C and connecting the side plate 12A and the rear edge portion 12C serves as a formation portion (second formation portion), which is a projecting portion 44 that protrudes in a convex shape. have. Specifically, as shown in FIGS. 4 and 5, a protruding portion 44 protruding outward in the seat width direction from the outer surface (side surface) of the side plate 12A is formed at the rear end of the side plate 12A. The projecting portion 44 is provided extending from the upper portion of the back side frame 12 to the lower portion of the intermediate portion. An outer end portion of the protrusion 44 in the seat width direction protrudes from the outer surface of the side plate 12A. In other words, the end portion on the side plate 12A side of the projecting portion 44 formed at the connecting portion 12E between the side plate 12A and the rear edge portion 12C protrudes from the surface of the side plate 12A.

Thus, by providing the projecting portion 44 having a projecting shape at the connection portion 12E between the side plate 12A and the rear edge portion 12C, the bent portion is formed with an uneven shape. The projecting portion 44 functions as a reinforcing portion to improve the rigidity of the back side frame 12 .

Further, the front edge portion 12B of the back side frame 12 is folded inward from the upper portion to the intermediate portion of the back side frame 12 so as to form a substantially U-shaped cross section, forming an acute angle with the side plate 12A. crossed. A connecting portion 12E provided between the side plate 12A and the front edge portion 12B is formed with concave-shaped beads 45A and 45B (also referred to as bead 45) as forming portions (third forming portions). It is

Specifically, as shown in FIGS. 4 to 6, a stepped portion is formed from the front end of the side plate 12A to the connecting portion 12E between the side plate 12A and the front edge portion 12B. A bead 45A is formed. Similarly, a stepped portion is formed from the front end of the front edge portion 12B to the connecting portion 12E, and a recessed bead 45B is formed between the steps.

A recessed bead 45 as a forming portion (third forming portion) is similarly formed in the lower edge portion 12D and the rear edge portion 12C of the back side frame 12, respectively. As shown in FIGS. 5 and 7, a stepped portion is formed from the lower end of the side plate 12A to the connecting portion 12E between the side plate 12A and the lower edge portion 12D, and a recessed bead 45 is formed between the steps. It is Moreover, a stepped portion is formed from the rear end of the side plate 12A to the connecting portion 12E between the side plate 12A and the rear edge portion 12C, and a recessed bead 45 is formed between the steps.

The bead 45 as a forming portion (third forming portion) is continuous from the upper portion to the lower end portion of the front end portion of the back side frame 12 except for the portion where the curved portion 40A, the curved portion 41A, and the curved portion 42A are formed. Further, it is formed continuously from the lower end portion to the curved portion 43A at the rear end portion.

In this manner, the connecting portion 12E provided between the side plate 12A and each of the front edge portion 12B, the rear edge portion 12C, and the lower edge portion 12D has a concave bead 45. As shown in FIG. By providing a concave bead 45 in the connection portion 12E that connects the two intersecting surfaces, the bent portion is formed with an uneven shape. The bead 45 functions as a reinforcing portion to improve the rigidity of the back side frame 12 .

As shown in FIG. 9, the curved portion 43A formed at the rear edge portion 12C of the back side frame 12 is provided above the reclining device 60. As shown in FIG. More specifically, the curved portion 43A is formed in a portion of the rear edge portion 12C that is located below the back side frame 12, in the vicinity of the connection portion with the cushion side frame 22, and above the reclining device 60. is provided. By providing the concave curved portion 43A at such a portion, when a load of a predetermined size or more is applied during a rear-end collision of the vehicle, the curved portion 43A formed on the rear surface of the back side frame 12 is used as a starting point. The backside frame 12 buckles. This can improve the safety of the seated occupant in the event of a rear-end collision.

<Other embodiments>
The shape, structure, and arrangement of the formation portion are not limited to the above-described embodiments, and other shapes and the like may be employed.
For example, it is preferable to provide a slit (notch) extending in a direction perpendicular to the extending direction at the extending direction end of the concave or convex bead (groove). According to such a configuration, in addition to the effect of improving rigidity by the bead as the forming portion, moldability is improved.
Alternatively, the surface of the second surface portion in the vicinity of the connection portion may be subjected to a surface pressing process to form a forming portion having stepped unevenness on the second surface portion. Such a configuration can also improve the rigidity of the seat frame.

In the above embodiments, the vehicle seat and the seat frame mounted on the vehicle of the automobile have been described, but the present invention is not limited to the vehicle seat of the automobile. It can be applied to a vehicle seat and its seat frame mounted on a vehicle other than an automobile, such as a railway vehicle, a ship, an aircraft, and the like.

S Vehicle seat S1 Seat back S2 Seat cushion S3 Headrest S1a, S2a, S3a Pad material S1b, S2b, S3b Skin material S3c Headrest stay 1 Seat frame 10 Seat back frame 11 Upper frame 11A Upper frame side portion 12 Back side frame (frame Element)
12A side plate (first surface)
12B front edge (second surface)
12C trailing edge (second surface)
12D lower edge (second surface)
12E connecting portion 12G maximum bulging portion 13 lower frame 14 cross member 15 pressure receiving member 15A wire 17 headrest mounting portion 20 seat cushion frame 21 pan frame 22 cushion side frame 23 connecting member 25 pressure receiving member 25A wire 30 bead portion 33 recessed portion 31A, 31B Airbag mounting holes 32A, 32B Webbing mounting holes 40, 41, 42 Protruding portion (second surface portion)
40A, 41A, 42A, 43A curved portion (forming portion, first forming portion)
44 protruding part (forming part, second forming part)
45, 45A, 45B beads (forming part, third forming part)
50 airbag device 60 reclining device 61 rotating shaft

Claims (8)

A seat frame for a vehicle seat,
a frame member having a first surface portion, a second surface portion provided at a position intersecting the first surface portion, and a connection portion connecting the first surface portion and the second surface portion;
The second surface portion has a forming portion having a predetermined shape,
The seat frame, wherein the forming portion includes a curved portion having a curvature different from the curvature of other portions of the second surface portion. The seat frame according to claim 1, wherein the forming portion has a substantially semicircular shape when viewed from the front of the second surface portion. The seat frame according to claim 1 or 2, wherein the forming portion has a concave shape when viewed from the front of the first surface portion. The connecting portion has a second forming portion having a predetermined shape,
The sheet according to any one of claims 1 to 3, wherein the second forming portion has a protruding portion in which an end portion on the side of the first surface portion protrudes from the surface of the first surface portion. flame. The connecting portion has a third forming portion having a predetermined shape,
5. The seat frame according to any one of claims 1 to 4, wherein the third forming portion has a concave bead. The seat frame according to any one of claims 1 to 5, wherein the first surface portion is provided with a concave bead portion. The frame member is a back side frame that constitutes a seat back of the vehicle seat,
The seat frame according to any one of claims 1 to 6, wherein the forming portion is provided above a reclining device of the vehicle seat. A seat frame according to any one of claims 1 to 7;
a pad material placed on the seat frame;
A vehicle seat comprising: a skin material covering the seat frame and the pad material.

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