JP6860802B2 - Seat back frame, seat frame and vehicle seat - Google Patents

Description

The present invention relates to a seat frame of a vehicle seat, and more particularly to a seat frame that is lighter than a conventional product.

When reducing the weight of a vehicle seat, it is generally considered to reduce the thickness of each part of the seat frame. However, the thinner the thickness of each part of the seat frame, the lower the rigidity of the part. On the other hand, when ensuring the rigidity of the seat frame, it is conceivable that the cross-sectional structure of the portion where the rigidity or the like should be secured is a closed cross-sectional structure. To give an example, in the seat frame described in Patent Document 1, the side frame of the seat back frame has a closed cross-sectional structure.

Japanese Unexamined Patent Publication No. 2014-88133

Explaining the seat frame described in Patent Document 1 in detail, the side frame (strictly speaking, the side frame of the seat back frame) has a closed cross-sectional structure from the upper end to the lower end. With such a configuration, the rigidity of the side frame can be ensured, but it is difficult to sufficiently reduce the weight of the seat frame. Therefore, as a configuration for ensuring both rigidity and weight reduction, it is conceivable to coexist a closed cross-section structure portion and an open cross-section structure portion in the side frame. However, if the cross-sectional shape suddenly changes at the boundary portion between the closed cross-sectional structure portion and the open cross-sectional structure portion, problems such as a significant decrease in rigidity and stress concentration may occur at the boundary portion.

Further, some seat frames are provided with a frame (connecting frame) for connecting the side frames. In such a seat frame, when the closed cross-section structure portion and the open cross-section structure portion coexist in the side frame, the connecting frame should be appropriately attached to the side frame while considering the positional relationship between the connecting frame and the side frame. Is required.

Further, the side frame may be attached with another member, for example, a support member for supporting the occupant or a force cloth attaching member for attaching the force cloth of the airbag. When the above-mentioned member is attached to the side frame in a configuration in which a closed cross-section structure portion and an open cross-section structure portion coexist in the side frame, it is required to attach the above member at a suitable position for smooth attachment work. ..

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a seat frame capable of appropriately coexisting a closed cross-section structure portion and an open cross-section structure portion in a side frame. There is.
Another object of the present invention is that a connecting frame for connecting the side frames can be appropriately attached to the side frame in which the closed cross-section structure portion and the open cross-section structure portion are appropriately coexisted. To provide a seat frame.
A third object of the present invention is to attach a support member for supporting an occupant or an airbag force cloth to a side frame in which a closed cross-section structure portion and an open cross-section structure portion appropriately coexist. It is an object of the present invention to provide a seat frame to which a force cloth attachment member can be appropriately attached.

According to the seat back frame of the present invention, the problem is a seat back frame of a seat back connected to a seat cushion of a vehicle seat via a reclining device, at both ends in the width direction of the vehicle seat. A closed cross-sectional structure portion having a provided side frame, the side frame forming one end portion in the extending direction of the side frame, and a cross section intersecting the extending direction having a closed cross-sectional structure, and the above-mentioned closed cross-section structure portion. A mounting hole for mounting a force cloth mounting member for an airbag , comprising an open cross-section structure portion having a portion continuous with the closed cross-section structure portion in the extending direction and having an open cross-section structure. A recess formed by denting inward from the position of the mounting hole in the width direction of the vehicle seat is provided, and the recess is formed at a position between the mounting hole and the reclining device. It is solved by being done.

In the seat frame of the present invention configured as described above, the closed cross-section structure portion and the open cross-section structure portion coexist in the side frame .

Further, in the seat back frame, the recess may be formed longer than the mounting hole in the vertical direction of the vehicle seat .

Further, in the seat back frame, the recess may be formed longer than the mounting hole in the front-rear direction of the vehicle seat .

Further, in the seat back frame, the mounting holes may be formed by at least two holes, an upper mounting hole provided above the side frame and a lower mounting hole provided below the upper mounting hole .

Further, in the seat back frame, the upper mounting hole may be provided between the closed cross-sectional structure portion and the recessed portion .

Further, in the seat back frame, the recess may be further formed at a position between the upper mounting hole and the lower mounting hole .

Further, in the seat back frame, it is preferable that the recess is provided at a position where both the upper mounting hole and the lower mounting hole overlap with each other in the vertical direction of the vehicle seat .

Further, in the seat back frame, the reclining device may be attached to the outer surface of the recess .

Further, in the seat back frame, the recess may be composed of a second recess to which the reclining device is attached and a first recess provided above the second recess .

Further, in the seat back frame, the first recess may overlap the closed cross-sectional structure portion in the front-rear direction of the vehicle seat .

Further, according to the seat frame of the present invention, the above-mentioned problem is solved by the seat frame including the above-mentioned seat back frame.

Further , according to the vehicle seat of the present invention, the subject is characterized by including the above-mentioned seat frame, a pad material mounted on the seat frame, and a skin material covering the surface of the pad material. It is solved by the vehicle seat.
Further, in the above-mentioned vehicle seat, the seat cushion may be attached to an upper rail that can slide and move along a lower rail fixed to a vehicle body floor.

According to the seat frame of the present invention, it is possible to suppress a sudden change in the cross-sectional shape at the boundary portion between the closed cross-sectional structure portion and the open cross-sectional structure portion in the side frame, and the rigidity is reduced due to the sudden change in the cross-sectional shape. And stress concentration can be suppressed.
Further, according to the seat frame of the present invention, the gap in the adjacent region gradually increases as the distance from the closed cross-sectional structure portion increases, so that the change in the cross-sectional shape at the boundary portion between the closed cross-sectional structure portion and the open cross-sectional structure portion is further increased. It becomes possible to suppress it effectively.
Further, according to the seat frame of the present invention, it is possible to improve the strength of the separated region.
Further, according to the seat frame of the present invention, the connecting frames can be appropriately arranged, and the connecting frames can satisfactorily connect the side frames.
Further, according to the seat frame of the present invention, the connecting frame is attached to the side by joining the portion of the second extension portion that has entered the inside of one end portion of the closed cross-section structure portion in the extension direction to the closed cross-section structure portion. It can be attached more appropriately to the frame.
Further, according to the seat frame of the present invention, it is possible to improve the rigidity of the side frame by setting the length of the adjacent region having lower rigidity among the adjacent regions to be shorter.
Further, according to the seat frame of the present invention, the support member can be appropriately attached to the side frame.
Further, according to the seat frame of the present invention, it is possible to appropriately attach the force cloth attaching member to the adjacent region of the side frame.
Further, according to the seat frame of the present invention, it is possible to attach the force cloth mounting member by effectively utilizing the space in the adjacent region.
Further, according to the seat frame of the present invention, it is possible to appropriately attach the force cloth attaching member to the separated region of the side frame.
Further, according to the seat frame of the present invention, when the force cloth attachment member is appropriately attached to the separation area of the side frame, it is possible to effectively prevent a part of the separation area from interfering with the force cloth attachment member. It becomes possible.
Further, according to the seat frame of the present invention, while exerting the reinforcing effect by the reinforcing portion more effectively, when a load is input at the time of a vehicle rear collision, the side frame is deformed with the fragile portion as a base point to cause an impact. Can be alleviated.

It is an overall view of the vehicle seat which concerns on one Embodiment of this invention. It is a figure when the seat frame which concerns on one Embodiment of this invention is seen obliquely from the front. It is a figure when the seat frame which concerns on one Embodiment of this invention is seen obliquely rearward. It is a schematic cross-sectional view which shows the part where the pillar guide is welded in the connecting frame. It is a figure when the side frame which concerns on one Embodiment of this invention is seen from the side. It is a figure when one part which constitutes a side frame is seen from the side. It is a figure when the other parts constituting a side frame are seen from the side. It is a figure when the side frame which concerns on one Embodiment of this invention is seen obliquely from the front. It is a figure which shows the AA cross section in FIG. It is a figure which shows the BB cross section in FIG. It is a figure which shows the CC cross section in FIG. It is a figure which shows the DD cross section in FIG. It is a figure which shows the 1st modification. It is a figure which shows the 2nd modification. It is a figure which shows the reclining device and the parts for attaching the reclining device.

Hereinafter, an embodiment of the present invention will be described. It should be noted that the embodiments described below are merely examples for facilitating the understanding of the present invention, and do not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof. Further, in the following description, the contents relating to the material, shape and size of each device and its constituent parts are merely one of specific examples, and do not limit the present invention. That is, the material, shape, and size of each device and its constituent parts can be freely designed as long as they satisfy the specific items of the present invention.

Further, in the following description, the "front-rear direction" means the front-rear direction of the vehicle seat, and specifically, is a direction that coincides with the traveling direction of the vehicle. Further, the "width direction" means the width direction of the vehicle seat, and specifically, is a direction that coincides with the vehicle width direction (left-right direction).

Further, in the following, unless otherwise specified, the description will be made on the assumption that the vehicle seat is in a used state (a state in which a seated person can be seated). That is, in the following description, the posture, position, positional relationship with other members, etc. of each part of the vehicle seat are the contents when the vehicle seat is in use.

<< About the basic configuration of vehicle seats and seat frames >>
First, the basic configuration of the vehicle seat (hereinafter, the present seat S) according to the present embodiment and the seat frame F forming the skeleton thereof will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the seat S has a seat back S1, a seat cushion S2, and a headrest S3. The seat back S1 and the seat cushion S2 are configured by placing the pad material P on the seat frame shown in FIGS. 2 and 3, respectively, and covering the surface of the pad material P with the skin material W. The headrest S3 is configured by arranging a pad material P on a core material (not shown) and covering the surface of the pad material P with a skin material W. A pair of headrest pillars (not shown) extending downward are provided below the headrest S3. The headrest S3 is supported by the upper end portion of the seat back S1 (strictly speaking, the seat back frame F1) via the pair of headrest pillars.

As shown in FIGS. 2 and 3, the seat S has a seat back frame F1 included in the seat back S1 and a seat cushion frame F2 included in the seat cushion S2. The seat cushion frame F2 is connected to the upper rail RU of the slide rail device R arranged below the seat cushion frame F2. With this configuration, when the upper rail RU moves along the lower rail RL fixed to the vehicle body floor, the entire seat S including the seat cushion frame F2 slides and moves.

In the present embodiment, the seat cushion frame F2 is connected to the upper rail RU via the rotation link XL as shown in FIG. The rotation link XL is a link member arranged on both sides of the seat cushion S2 in the width direction, and rotates about a rotation axis along the width direction. Then, the rotation link XL rotates while rotating around the seat cushion S2, so that the position of the seat cushion S2 in the vertical direction is adjusted.

Further, a lower end portion of the seat back frame F1 is connected to the rear end portion of the seat cushion frame F2 via a reclining device 80. By the reclining device 80, the seat back S1 including the seat back frame F1 is connected to the seat cushion S2 in a state where the inclination angle with respect to the seat cushion S2 can be adjusted. That is, the seat back S1 can rotate relative to the seat cushion S2 about the reclining shaft 81 along the width direction.

The seat S is different from the conventional general vehicle seat in the structure of the seat frame. Hereinafter, the configuration of the seat back frame F1 as the seat frame included in the seat S will be described in detail. The configuration described below (particularly the structure of the side frame 10) is not only applied to the seat back frame F1 but also to the seat cushion frame F2.

<< Detailed configuration of seat back frame >>
The configuration of the seat back frame F1 included in the seat S will be described in detail with reference to FIGS. 2 and 3 and FIGS. 4 to 10 described above. As shown in FIG. 2, the seat back frame F1 forms a square frame when the seat frame F is viewed from the front. Further, the seat back frame F1 is lighter than the seat back frame of a conventional general vehicle seat. Specifically, as the material constituting the seat back frame F1 (for example, the steel plate constituting the side frame 10 described later), a material lighter than the material used for the conventional seat back frame is used. .. Further, when fastening / connecting the parts constituting the seat back frame F1, the parts are fastened / connected by laser welding without using fasteners such as bolts / nuts and screws. By adopting such a configuration, the seat back frame F1 according to the present embodiment is lighter.

Explaining the structure of the seat back frame F1, the seat back frame F1 has a pair of side frames 10 provided at both ends in the width direction as shown in FIGS. 2 and 3. Further, as shown in the figure, the seat back frame F1 has an upper frame 30 that is attached to the upper end of each side frame 10 to connect the side frames 10. Further, as shown in the figure, the seat back frame F1 has a lower member frame 50 which is attached to the lower end of each side frame 10 to connect the side frames 10. Further, an S spring 60 as a support member for supporting the back of the occupant from behind is erected between the side frames 10.

Hereinafter, the upper frame 30, the lower member frame 50, and the side frame 10 will be described in this order.
The upper frame 30 is a part formed in a downward U-shape when viewed from the front, and corresponds to a connecting frame. Further, in the present embodiment, the upper frame 30 is made of a metal hollow pipe member. However, the present invention is not limited to this, and the upper frame 30 may be composed of solid members. Further, as shown in FIG. 2, the upper frame 30 has a horizontal portion 31 as a first extending portion extending in the width direction and a second extending portion located on both sides of the horizontal portion 31 in the width direction. It has a downward extending portion 32 and the like. Each downward extending portion 32 extends downward toward the side frame 10, and its lower end portion 32a is joined to the upper portion of the side frame 10.

The portion of the downward extending portion 32 located above the lower end portion 32a (hereinafter, the oblique portion 32b) is oblique so as to expand outward in the width direction toward the lower side. Further, as shown in FIGS. 2 and 3, a communication plate 33 extending along the width direction is erected between the lower ends of the oblique portion 32b. Of the connecting plate 33, both ends in the width direction are fixed to the oblique portion 32b by laser welding. Further, both ends in the width direction of the connecting plate 33 are curved so as to be displaced rearward from the portion fixed to the oblique portion 32b toward the inside in the width direction.

A square tubular pillar guide 34 that supports the headrest pillar is attached to the front surface of the horizontal portion 31 of the upper frame 30. A pair of pillar guides 34 are provided at intervals in the width direction. Further, the portion of the horizontal portion 31 to which the pillar guide 34 is attached is crushed so that the front surface thereof becomes flat. The pillar guide 34 is fixed to the crushed flat portion.

Looking at the cross section of the horizontal portion 31 to which the pillar guide 34 is fixed, when looking at the cross section orthogonal to the width direction, as shown in FIG. 4, the portion raised upward and downward by being crushed (hereinafter, the raised portion). 31a) is formed. In the present embodiment, the pillar guide 34 is fixed by using the raised portion 31a. More specifically, by irradiating the welding laser from the rear of the raised portion 31a with the front surface of the raised portion 31a and the rear surface of the pillar guide 34 in contact with each other, the raised portion 31a and the pillar guide 34 are laser-welded. There is. Incidentally, in FIG. 4, the raised portion 31a is shown slightly larger than the actual size in order to make the explanation easier to understand.

Next, the lower member frame 50 will be described. The lower member frame 50 is formed by processing a sheet metal, and is erected between the lower ends of the side frame 10 (strictly speaking, between the lower ends of the rear wall portion 14 of the outer part 11 described later). Further, the upper edge portion and the lower edge portion of the lower member frame 50 are respectively bent forward to form a flange.

Next, the side frame 10 will be described with reference to FIGS. 5A to 5C. Note that FIG. 5A is a diagram showing the side frame 10 according to the present embodiment, and FIGS. 5B and 5C are diagrams showing each part constituting the side frame 10, and both views are viewed from the inside in the width direction. It is a figure of the time.

As shown in FIG. 5A, the side frame 10 has a spindle-shaped outer shape in a lateral view. That is, when the side frame 10 is viewed from the side, the front end portion of the side frame 10 bulges in an arc shape from an intermediate position in the vertical direction. When the seat S is in use (more strictly, when the seat back S1 is in the reference position), the side frame 10 is slightly tilted (backward tilted) with respect to the vertical direction. It has been extended for a long time. Incidentally, in the following, the extension direction of the side frame 10 will be referred to as a "frame extension direction".

Further, a lower end portion 32a of the lower extending portion 32 of the upper frame 30 is joined to one end portion (upper end portion) of the side frame 10 in the extending direction. Here, in a state where the lower end portion 32a is joined to the upper end portion of the side frame 10, the extension direction of the downward extension portion 32 substantially coincides with the frame extension direction. In this sense, it can be said that the frame extension direction corresponds to the extension direction of the downward extension portion 32.

In the present seat S, the length of the lower end portion 32a of the downward extending portion 32, which is joined to the upper end portion of the side frame 10, is shorter than that of the conventional vehicle seat. This is to make the seat S lighter than the conventional vehicle seat. Further, in the present embodiment, the thickness of the steel plate constituting the side frame 10 is smaller than the thickness of the pipe constituting the upper frame 30.

Further, in the present embodiment, the side frame 10 is made of a thin steel plate, more specifically, an ultra-high-strength steel plate having a thickness of 1 mm or less. Further, the side frame 10 according to the present embodiment is configured by joining a plurality of frame pieces, specifically, two frame pieces to each other. More specifically, each side frame 10 has an outer part 11 shown in FIG. 5B and an inner part 12 shown in FIG. 5C as constituent parts. All of these parts are formed by processing ultra-high-strength steel sheets.

The outer part 11 corresponds to one frame piece among the plurality of frame pieces constituting the side frame 10, and mainly constitutes the outer portion in the width direction in the side frame 10. The inner part 12 corresponds to another frame piece, and mainly constitutes a portion inside the side frame 10 in the width direction. Then, as shown in FIG. 6, the outer part 11 and the inner part 12 are joined by laser welding in a state where the outer parts 11 and the inner parts 12 are partially overlapped to form the side frame 10. In addition, in FIG. 6, the welding mark at the time of laser welding is shown by a broken line of a thick line.

Hereinafter, the structure of the side frame 10 will be described in more detail with reference to FIGS. 6 to 10 together with FIGS. 3 and 5A to 5C described above. First, in explaining the structure of the side frame 10, each configuration of the outer part 11 and the inner part 12 will be described.

The outer part 11 has a substantially U-shaped cross section intersecting the frame extending direction, and has a side wall portion 13 and a rear wall portion 14 as shown in FIGS. 6 to 10. The side wall portion 13 is a portion of the side frame 10 located at the outer end in the width direction. Then, the end surface of the side wall portion 13 defines the end surface on the outer side in the width direction of the side frame 10. That is, the outer shape of the side wall portion 13 corresponds (substantially matches) with the outer shape of the side frame 10 as can be seen by comparing FIGS. 5A and 5B. Further, the front end portion of the side wall portion 13 includes a flange portion 13a formed by bending inward in the width direction at a substantially right angle. The flange portion 13a is formed over a wide range from the middle portion to the lower end portion of the side wall portion 13 in the frame extending direction.

Further, as shown in FIG. 5B, a plurality of rectangular holes and circular holes are formed in the side wall portion 13. The end of the S spring 60 and the force cloth attachment clip 70, which will be described later, are inserted into and engaged with these holes. The details of the above holes will be described later.

Further, as shown in FIG. 5B, a mounting hole 13b for mounting the reclining device 80 is formed in the lower portion of the side wall portion 13. The reclining device 80 is attached to the side wall portion 13 so that the reclining shaft 81 passes through the attachment hole 13b. In this embodiment, a plurality of attachment parts are used to attach the reclining device 80 to the side wall portion 13. The mounting parts and the like of the reclining device 80 will be described later.

The rear wall portion 14 is a portion provided so as to be substantially orthogonal to the rear end portion of the side wall portion 13, and extends inward in the width direction as shown in FIG. Further, the rear wall portion 14 extends long in the frame extending direction, and the end positions (upper end position and lower end position) of the rear wall portion 14 in the same direction are substantially aligned with the end positions of the side wall portion 13. Further, a flange portion 14a formed by bending the rear wall portion 14 at a substantially right angle toward the front is provided at an end portion on the inner side in the width direction of the rear wall portion 14. The flange portion 14a is formed over a wide range from the upper end portion to the lower end portion of the rear wall portion 14 in the frame extending direction. As shown in FIG. 6, the flange portion 14a is interrupted at a position directly above the lower member frame 50 in the frame extending direction for the convenience of attaching the lower member frame 50 to the lower end portion of the rear wall portion 14.

Further, as shown in FIG. 3, a bead formed along the frame extending direction (hereinafter referred to as a rear wall bead 14b) is formed on the rear surface of the rear wall portion 14. The rear wall bead 14b is provided to improve the rigidity of the rear wall 14 (particularly, the rigidity against a load acting in the front-rear direction), and the central portion in the width direction of the rear wall 14 is recessed forward. It is formed. In the present embodiment, the rear wall bead 14b is formed so that its lower end reaches a position directly above the lower member frame 50.

As shown in FIG. 5C, the inner part 12 has a curved shape according to the outer shape of the side frame 10, and has a part upper portion 15, a part central portion 16 and a part lower portion 17 as shown in FIG. .. The upper part 15 of the part constitutes the upper end portion of the inner part 12, and as shown in FIG. 7, the cross section intersecting the frame extending direction has a substantially U-shape. Then, as shown in FIGS. 6 and 7, the upper part 15 is combined with the upper part of the outer part 11 and joined to form the closed cross-sectional structure portion 10a of the side frame 10. The closed cross-section structure portion 10a will be described in detail later.

The central portion 16 of the part constitutes a portion of the inner part 12 adjacent to the lower end portion of the upper portion 15 of the part, and extends diagonally forward from the lower end of the upper portion 15 of the part. Further, as shown in FIG. 8, the cross section of the central portion 16 of the part intersecting the frame extending direction has a substantially V shape. Then, as shown in FIGS. 6 and 7, the part central portion 16 is combined with the intermediate portion of the outer part 11 in the frame extending direction and joined to form the open cross-sectional structure portion 10b of the side frame 10. ing. Strictly speaking, the central portion 16 of the part is joined to the front end portion of the side wall portion 13 of the outer part 11 so that the portion of the open cross-section structure portion 10b is adjacent to the closed cross-section structure portion 10a in the frame extension direction. Consists of an adjacent region 10x located in. The open cross-section structure portion 10b and the adjacent region 10x will be described in detail later.

The lower portion 17 of the part constitutes a portion of the inner part 12 located below the central portion 16 of the part, and extends downward from the lower end of the central portion 16 of the part 16 while being curved in an arc shape. Further, as shown in FIG. 9, the cross section of the lower part 17 of the part intersecting the frame extending direction has a substantially S shape. The lower part 17 of the part is formed so as to be slightly narrower than the upper part 15 of the part in the front-rear direction. Then, as shown in FIGS. 6, 9 and 10, the lower part 17 of the part is combined with the lower part of the outer part 11 to form the open cross-sectional structure portion 10b of the side frame 10. Strictly speaking, the lower portion 17 of the part is joined to the front end portion of the side wall portion 13 of the outer part 11 so as to be located at a position of the open cross-section structure portion 10b separated from the closed cross-section structure portion 10a in the frame extending direction. It constitutes the existing separation region 10y. In particular, the lower part 17 of the part constitutes only the front end portion of the separation region 10y in the side frame 10. The separation region 10y will be described in detail later.

Next, the structure of the side frame 10 will be described. As shown in FIG. 6, a closed cross-section structure portion 10a is formed at the upper end portion of the side frame 10. As shown in FIG. 7, the closed cross-section structure portion 10a is a portion having a closed cross-section structure in a cross section intersecting the frame extending direction.

Then, the lower end portion 32a of the lower extension portion 32 of the upper frame 30 is inserted inside the upper end portion (one end portion in the frame extension direction) of the closed cross-section structure portion 10a, and the lower end portion 32a further has a closed cross-section structure. It is joined to the portion 10a. That is, the end portion of the side frame 10 located on the same side as the downward extending portion 32 in the frame extending direction forms the closed cross-section structure portion 10a. On the other hand, the downward extending portion 32 enters the inside of the upper end portion of the closed cross-section structure portion 10a and is joined to the upper end portion. As a result, the upper frame 30 can be properly assembled to the side frame 10, and as a result, the side frames 10 are well connected to each other by the upper frame 30. In the present embodiment, the downward extending portion 32 and the upper end portion of the closed cross-section structure portion 10a are joined by irradiating a laser for welding from the outside of the upper end portion.

On the other hand, as described above, in the present sheet S, for the purpose of reducing the weight, the length of the portion of the downward extending portion 32 that is joined to the upper end portion of the side frame 10 (hereinafter referred to as the joining length) is set. It is shorter than the conventional vehicle seat. Here, if the joint length is shortened, the support rigidity of the side frame 10 is impaired accordingly. Here, the support rigidity of the side frame 10 means the stability of the support state of the side frame 10 when an external force acts on the side frame 10.

On the other hand, in the present embodiment, the upper end portion of the side frame 10 to which the downward extending portion 32 is joined is the closed cross-sectional structure portion 10a. Since the closed cross-section structure portion 10a has a closed cross-section structure, the support rigidity is ensured. Further, as shown in FIG. 6, the closed cross-section structure portion 10a extends so that the lower end of the closed cross-section structure portion 10a is located below the lower end of the downward extending portion 32 in the frame extending direction. That is, in the side frame 10, the portion located below the downward extending portion 32 (that is, the portion not joined to the downward extending portion 32) is a closed cross-sectional structure portion 10a, so that the support rigidity is increased. Is secured.

As described above, in the present embodiment, the upper end portion of the side frame 10 is a closed cross-section structure portion 10a, and then the downward extending portion 32 of the upper frame 30 is joined to the closed cross-section structure portion 10a, and further, the closed cross-section structure portion is joined. 10a extends below the lower end of the downward extending portion 32. As a result, it is possible to compensate for the impaired support rigidity by shortening the joint length.

In the present embodiment, as shown in FIG. 7, the closed cross-section structure portion 10a is formed by joining the upper portion of the outer part 11 and the upper portion 15 of the inner part 12 by laser welding in a state of overlapping. Has been done. More specifically, in the upper portion of the outer part 11, the flange portion 14a of the side wall portion 13 and the rear wall portion 14 overlaps with the part upper portion 15 of the inner part 12. By irradiating the overlapping portions with a laser for welding along the frame extending direction, the upper portion of the outer part 11 and the upper portion 15 of the inner part 12 are joined. If the two parts are superposed to form the closed cross-section structure portion 10a as described above, the strength of the closed cross-section structure portion 10a is further increased, and the support rigidity of the side frame 10 can be further secured.

Further, in the present embodiment, the thickness of the steel plate constituting the side frame 10 is smaller than the thickness of the pipe constituting the upper frame 30. As a result, even if the closed cross-section structure portion 10a is extended below the lower end of the downward extending portion 32 while shortening the joint length, the weight increase of the side frame 10 is suppressed (specifically, the conventional product). It is possible to reduce the weight.

By the way, if the entire side frame 10 has a closed cross-sectional structure, the weight of the side frame 10 increases by that amount. Therefore, in the present embodiment, only the upper end portion of the side frame 10 is designated as the closed cross-section structure portion 10a, and the portion located below the closed cross-section structure portion 10b is designated as the open cross-section structure portion 10b. Here, the open cross-section structure portion 10b is a portion of the side frame 10 having a cross-section that is continuous with the closed cross-section structure portion 10a in the frame extension direction and intersects with the frame extension direction. That is, in the open cross-sectional structure portion 10b, as shown in FIGS. 8 and 9, a gap Q is formed by interrupting the continuous portion in the above cross section.

As described above, in the present embodiment, by forming only the upper end portion of the side frame 10 as the closed cross-section structure portion 10a, the weight of the seat back frame F1 including the side frame 10 is increased while ensuring the support rigidity of the side frame 10. It is possible to reduce the weight.

Further, in the present embodiment, the open cross-section structure portion 10b has an adjacent region 10x located adjacent to the closed cross-section structure portion 10a in the frame extending direction and a separation region located away from the closed cross-section structure portion 10a. It is divided into 10y and 10y.

The adjacent region 10x is a region of the open cross-section structure portion 10b adjacent to the lower end portion (the other end portion in the frame extending direction) of the closed cross-section structure portion 10a. The adjacent region 10x is formed by joining the central portion of the outer part 11 and the central portion 16 of the inner part 12 in the frame extending direction by laser welding in an overlapping state. More specifically, among the central portions of the outer part 11, the flange portion 13a of the side wall portion 13 overlaps with the central portion 16 of the inner part 12. By irradiating the overlapping portions with a laser for welding along the frame extending direction, the central portion of the outer part 11 and the central portion 16 of the inner part 12 are joined. An adjacent region 10x is formed by the central portion of the joined outer part 11 and the central portion 16 of the inner part 12.

Further, as shown in FIG. 8, the adjacent region 10x has a pair of end portions 10s and 10t located at positions adjacent to the above-mentioned gap Q in the continuous portion in the cross section. Further, as shown in FIG. 8, each of the pair of end portions 10s and 10t of the adjacent region 10x extends so that the respective tips thereof extend toward the gap Q in the cross section.

The separation region 10y is a region of the open cross-sectional structure portion 10b located below the adjacent region 10x. The separation region 10y is formed by joining the lower portion of the outer part 11 in the frame extending direction and the lower portion 17 of the inner part 12 by laser welding in an overlapping state. More specifically, among the lower portions of the outer part 11, the flange portion 13a of the side wall portion 13 overlaps with the lower portion 17 of the inner part 12. By irradiating the overlapping portions with a laser for welding along the frame extending direction, the lower portion of the outer part 11 and the lower portion 17 of the inner part 12 are joined. Then, a separation region 10y is formed by the lower portion of the joined outer part 11 and the lower portion 17 of the inner part 12.

Further, as shown in FIG. 9, the separation region 10y has a pair of end portions 10s and 10t located at positions adjacent to the above-mentioned gap Q in the continuous portion in the cross section. Of the pair of end portions 10s and 10t of the separation region 10y, the end portion 10s located on the front side is folded back in the front-rear direction as shown in the figure. That is, the end portion 10s located on the front side has two overlapping portions (hereinafter, overlapping portions 10v and 10w) in the width direction. As described above, in the present embodiment, the strength of the open cross-section structure portion 10b including the separation region 10y is increased by folding back the end portion 10s located on the front side of the pair of end portions 10s and 10t of the separation region 10y. Has been done.

In the present embodiment, of the pair of end portions 10s and 10t of the separation region 10y, the end portion 10s located on the front side is folded back, but the present invention is not limited to this, and the end portion 10s is further rearward. The located end portion 10t may be folded back.

Further, as shown in FIG. 9, the end portion 10s located on the front side forms a closed space C by joining the two overlapping portions 10v and 10w. More specifically, the end portion 10s located on the front side is folded back in the front-rear direction as described above, but particularly in the present embodiment, it is folded back in a bag shape. That is, in the folded end portion 10s, the region further rearward is narrowed with respect to the region further forward, and the overlapping portions 10v and 10w are in contact with each other. Then, the two overlapping portions 10v and 10w are joined by irradiating the two overlapping portions 10v and 10w that are in contact with each other with a laser for welding. As a result, the end portion 10s located on the front side forms the closed space C. As described above, in the present embodiment, since the end portion 10s located on the front side forms the closed space C, the strength of the open cross-section structure portion 10b including the separation region 10y is further increased.

When joining the two overlapping portions 10v and 10w, a laser for welding is irradiated from the inside in the width direction (in other words, of the two overlapping portions 10v and 10w, the overlapping portion 10w located inside in the width direction is irradiated. It is supposed to irradiate the laser.

Further, in the present embodiment, the two overlapping portions 10v and 10w are joined by laser welding, and the end portion 10s located on the front side forms the closed space C, but the present invention is limited to this. It's not something. As shown in FIG. 11, the configuration may be such that the two overlapping portions 10v and 10w are separated from each other at a distance (that is, the end portion 10s located on the front side is not closed).

By the way, in the present embodiment, as shown in FIG. 6, the degree of opening of the cross section in the adjacent region 10x of the open cross-sectional structure portion 10b becomes larger as it goes downward. That is, the pair of end portions 10s and 10t of the adjacent region 10x are separated as they are farther from the closed cross-section structure portion 10a in the frame extending direction, and a larger gap Q is separated. Further, in the present embodiment, as can be seen by comparing FIGS. 8 and 9, the gap Q (that is, the degree of opening of the cross section) in the cross section of the open cross-sectional structure portion 10b is larger in the separated region 10y than in the adjacent region 10x. ing. With such a configuration, it is possible to suppress a sudden change in the cross-sectional shape at the boundary portion between the closed cross-sectional structure portion 10a and the open cross-sectional structure portion 10b. This makes it possible to suppress a decrease in rigidity and stress concentration of the side frame 10 due to a sudden change in cross-sectional shape.

Further, as described above, the gap Q in the adjacent region 10x gradually increases as it is located at a position away from the closed cross-section structure portion 10a in the frame extending direction. As a result, it is possible to more effectively suppress a sudden change in the cross-sectional shape at the boundary portion between the closed cross-sectional structure portion 10a and the open cross-sectional structure portion 10b.

To explain the structure of the side frame 10 according to the present embodiment in more detail, as shown in FIG. 5A, the length of the adjacent region 10x in the frame extending direction is shorter than the length of the closed cross-section structure portion 10a in the same direction. ing. That is, in the present embodiment, the adjacent region 10x, which is less rigid than the closed cross-section structure portion 10a, is configured to be shorter than the closed cross-section structure portion 10a in the frame extending direction. As a result, in the present embodiment, the side frame 10 has higher rigidity than the case where the adjacent region 10x is configured to be longer than the closed cross-section structure portion 10a.

Further, the side frame 10 is formed with recesses formed by denting inward in the width direction as shown in FIGS. 2, 3 and 7. The recess is formed in the side wall portion 13 of the outer part 11 constituting the side frame 10, more specifically, the central portion of the side wall portion 13 in the frame extending direction, and the portion corresponding to the lower half. As described above, in the present embodiment, the strength of the side frame 10 is enhanced by providing the side wall portion 13 with the recess. The number of recesses provided in the side wall portion 13 and the locations where the recesses are provided are not particularly limited.

Incidentally, among the recesses formed in the side frame 10, the recess formed in the central portion of the side wall portion 13 (hereinafter, the first recess 20) is a substantially triangular recess in a lateral view. Further, as can be seen by comparing FIGS. 5A, 5B and 5C, the first recess 20 is arranged so that the upper end of the first recess 20 is located above the lower end of the closed cross-sectional structure portion 10a in the side frame 10. It is provided.

By the way, when the recess is provided in the side frame 10, the cross-sectional coefficient of the portion where the recess is provided decreases, and in particular, it changes remarkably in the portion where the upper end of the recess is located. On the other hand, in the present embodiment, the portion of the side frame 10 where the upper end of the first recess 20 is located is the closed cross-section structure portion 10a. With such a configuration, it is possible to suppress a decrease in the cross-sectional coefficient at the portion of the side frame 10 where the upper end of the first recess 20 is located.

Further, among the recesses formed in the side frame 10, the recess formed in the lower half portion of the side wall portion 13 (hereinafter, the second recess 21) is the outer surface of the side wall portion 13 (the surface outward in the width direction). It is formed over a wide area on the surface). Here, a part of the second recess 21 forms an end portion 10s located on the front side of the pair of end portions 10s and 10t of the separation region 10y. Strictly speaking, of the two overlapping portions 10v and 10w formed by folding back the end portion 10s, the overlapping portion 10v located on the outer side in the width direction is the second recess 21 as shown in FIG. Located inside.

The overlapping portion 10v located in the second recess 21 is joined to the overlapping portion 10w facing the overlapping portion 10w by laser welding. As described above, in the present embodiment, one of the two overlapping portions 10v and 10w to be joined is located within the range where the strength of the second recess 21, that is, the side frame 10 is increased. This makes it possible to secure the joining strength when joining the two overlapping portions 10v and 10w by laser welding. Here, the bonding strength means the stability of the contact state between the two overlapping portions 10v and 10w at the stage of bonding both.

Further, as shown in FIGS. 3 and 5B, a floating island-shaped bead portion (hereinafter, convex bead) surrounded by a second concave portion 21 is provided on the lower half portion of the side wall portion 13 of the side frame 10. 22) is formed. The convex bead 22 corresponds to a reinforcing portion, and is provided at the lower end portion of the side frame 10 to provide rigidity of the side frame 10 (particularly, rigidity against a load input from the occupant to the upper portion of the seat back S1 at the time of a rear collision of the vehicle). ) Is provided to increase. Further, the convex bead 22 is formed by raising a predetermined portion in the side frame 10 toward the outside, and in the present embodiment, the convex bead 22 is formed so as to extend linearly in the front-rear direction.

The convex bead 22 may be formed so that the position of each portion of the bead is lowered toward the rear end. More preferably, the convex bead 22 is formed so as to extend in the direction along the input direction of the load input to the upper portion of the seat back S1 at the time of a rear collision of the vehicle. Further, in the present embodiment, the convex bead 22 is formed at the same height as the folded side end portion 10s of the pair of end portions 10s and 10t of the separation region 10y. More precisely, the formation position of the convex bead 22 is substantially the same as the two overlapping portions (overlapping portions 10v, 10w) at the folded end portion 10s in the frame extending direction. Due to such a positional relationship, in the present embodiment, the strength of the side frame 10 is effectively enhanced by the combination of the folding back of the end portion 10s and the formation of the convex bead 22.

Further, the convex bead 22 is not limited to the configuration provided on the side wall portion 13, and may be provided on the rear wall portion 14 as shown in FIG. Explaining the configuration shown in FIG. 11, a fragile portion 23 along the width direction is formed at the lower end portion of the rear wall portion 14. The fragile portion 23 is a portion that serves as a deformation base point when the side frame 10 is bent when an impact load of a predetermined size or more is applied at the time of a rear collision of the vehicle, and is composed of holes, recesses, and the like. The fragile portion 23 is provided at a position rearward from the convex bead 22 provided on the side wall portion 13. More specifically, as shown in FIG. 11, it is preferable that the side wall portion 13 and the rear wall portion 14 are formed at a position straddling the boundary portion (corner portion). In the above configuration, the second convex bead 22 extending in the direction intersecting the fragile portion 23 is provided in the portion of the rear wall portion 14 located above or below the fragile portion 23. Good.

<< About the mounting position of the S spring on the side frame >>
As shown in FIGS. 2 and 3, the seat back frame F1 according to the present embodiment includes an S spring 60 erected between the side frames 10 in the width direction. On the other hand, the S spring 60 extends while meandering in the vertical direction along the width direction. Further, the extending direction end portion of the S spring 60 is hooked on the engaging hole 13x formed in the side wall portion 13 of the outer part 11 in the side frame 10. As a result, the S spring 60 is attached to the side frame 10.

Here, when the forming position of the engaging hole 13x will be described, as can be seen by comparing FIGS. 5A and 5C, the engaging hole 13x is formed at the same position as the adjacent region 10x in the frame extending direction. Further, the engaging holes 13x are formed between the pair of end portions 10s and 10t of the adjacent regions 10x in the front-rear direction. That is, in the present embodiment, the mounting position of the S spring 60 is the same position as the adjacent region 10x in the frame extending direction, and is a position away from the pair of end portions 10s and 10t of the adjacent region 10x. There is. Due to such a positional relationship, in the present embodiment, the S spring 60 is appropriately attached to the side frame 10 so as not to interfere with the pair of end portions 10s and 10t of the adjacent region 10x.

<< About the mounting position of the force cloth mounting clip on the side frame >>
In the seat back frame F1 according to the present embodiment, the force cloth attachment clip 70 shown in FIG. 10 is attached to the side frame 10 closer to the vehicle door. The force cloth attachment clip 70 corresponds to a force cloth attachment member and is a component for attaching the force cloth of an airbag (not shown). On the other hand, in the side frame 10, the side wall portion 13 of the outer part 11 is formed with rectangular insertion holes 13y and 13z for inserting the force cloth mounting clip 70. Then, as shown in FIG. 10, the force cloth mounting clip 70 is attached to the side frame 10 by inserting a part of the force cloth mounting clip 70 into the insertion holes 13y and 13z.

Further, in the present embodiment, as shown in FIG. 5B, two insertion holes 13y and 13z are formed at different positions in the frame extending direction. Hereinafter, the formation positions of the insertion holes 13y and 13z, respectively, will be described. In the following, the insertion hole 13y located higher in the frame extension direction will be referred to as "upper insertion hole 13y", and the insertion hole 13z located further below will be referred to as "lower insertion hole 13z". ..

The upper insertion hole 13y is formed at the same position as the adjacent region 10x in the frame extending direction, as can be seen by comparing FIGS. 5A and 5B. Further, the upper insertion hole 13y is formed at a position deviated from each of the pair of end portions 10s and 10t of the adjacent region 10x in the width direction. Specifically, the upper insertion hole 13y is formed at a position facing the end portion 10s located on the front side of the pair of end portions 10s and 10t of the adjacent region 10x in the width direction. That is, in the present embodiment, the mounting position of the force cloth mounting clip 70 inserted into the upper insertion hole 13y is the same position as the adjacent region 10x in the frame extending direction, and the pair of ends of the adjacent region 10x. It is located away from 10s and 10t. Due to such a positional relationship, in the present embodiment, the force cloth attachment clip 70 is appropriately attached to the side frame 10 so as not to interfere with the pair of end portions 10s and 10t of the adjacent region 10x. Further, of the pair of end portions 10s and 10t of the adjacent region, a space is formed inside the end portion 10s located on the front side in the width direction. In the present embodiment, the force cloth attachment clip 70 is attached by effectively utilizing the space.

In the present embodiment, as shown in FIG. 5B, the upper insertion hole 13y is a portion of the side wall portion 13 in which the above-mentioned recesses (first recess 20 and second recess 21) are not formed. That is, it is formed in a portion (non-recessed portion) located on the outer side in the width direction. Further, in the present embodiment, the upper insertion hole 13y is located in front of the engagement hole 13x formed for attaching the S spring 60, as shown in FIG. 5B. In other words, in the seat back frame F1 according to the present embodiment, the S spring 60 is arranged behind the force cloth mounting clip 70 to be inserted into the upper insertion hole 13y.

The lower insertion hole 13z is formed at the same position as the separation region 10y in the frame extending direction, as can be seen by comparing FIGS. 5A and 5B. Further, the lower insertion hole 13z is formed in the vicinity of the folded end portion (that is, the end portion 10s located on the front side) of the pair of end portions 10s and 10t of the separation region 10y. There is. More specifically, as shown in FIG. 10, the end portion 10s has two portions (overlapping portions 10v, 10w) that overlap in the width direction by being folded back. On the other hand, the lower insertion hole 13z is formed behind the inner overlapping portion 10w of the two portions 10v and 10w. More specifically, as shown in FIG. 5A, the lower insertion hole 13z is formed immediately behind the inner overlapping portion 10w. Further, in the present embodiment, of the inner overlapping portion 10w, the portion located immediately before the lower insertion hole 13z is cut out to form a relief portion 10u as shown in the figure. .. The relief portion 10u is a portion formed for exchanging the force cloth mounting clip 70 at the inner overlapping portion 102.

That is, in the present embodiment, the mounting position of the force cloth mounting clip 70 inserted into the lower insertion hole 13z is the same position as the separation region 10y in the frame extending direction, and one end of the separation region 10y. In 10s, it is a position deviated from the overlapping portion 10w located inside in the width direction. Due to such a positional relationship, in the present embodiment, the force cloth attaching clip 70 is appropriately attached to the side frame 10 so as not to interfere with the overlapping portion 10w.

Further, the force cloth attachment clip 70 to be inserted into the lower insertion hole 13z is attached to the side frame 10 at a peripheral position of the overlapping portion 10w. On the other hand, a notch-shaped relief portion 10u is formed in the overlapping portion 10w. As a result, when the force cloth attachment clip 70 to be inserted into the lower insertion hole 13z is attached to the side frame 10, it is possible to more effectively avoid the interference with the overlapping portion 10w.

In the present embodiment, of the pair of end portions 10s and 10t of the separation region 10y, the folded end portion 10s is relatively short for the purpose of avoiding interference with the force cloth mounting clip 70. ing. Further, the end portion 10s forms a closed space C by joining two overlapping portions 10v and 10w, but the relief portion 10u described above is formed in the vicinity of the lower insertion hole 13z. , As shown in FIG. 10, the closed space C is not closed and is open. However, the present invention is not limited to this, and the formation position of the lower insertion hole 13z is shifted rearward from the position shown in FIG. 10 to form a closed space C even in the vicinity of the lower insertion hole 13z. There may be.

Further, in the present embodiment, as shown in FIG. 5B, the lower insertion hole 13z is a non-recessed portion of the side wall portion 13 in which the above-mentioned recesses (first recess 20 and second recess 21) are not formed. Is formed in.

<< Installation of reclining device >>
In the present embodiment, the reclining device 80 is attached to the lower end portion of the seat back frame F1, more specifically, the lower end portion of the side wall portion 13 of the outer part 11 constituting the side frame 10. More specifically, a mounting hole 13b for mounting the reclining device 80 is formed at the lower end of the side wall portion 13. As shown in FIG. 13, the mounting hole 13b has a substantially upside-down keyhole shape when viewed from the side. That is, the lower portion of the mounting hole 13b is circular, and the upper portion is substantially rectangular.

Further, in the present embodiment, the first bracket 82 is interposed between the side wall portion 13 and the reclining device 80 in the width direction, and the reclining device 80 is attached to the side wall portion 13 via the first bracket 82. There is. The first bracket 82 is made of a relatively thick steel plate, and has a substantially inverted keyhole-shaped base portion 82a and an overhanging portion 82b protruding outward in the width direction from the upper end portion of the base portion 82a, as shown in FIG. Have. One end of the spiral spring 85 is locked to the overhanging portion 82b. That is, the urging force of the spiral spring 85 directly acts on the overhanging portion 82b.

The base portion 82a is composed of a ring-shaped lower portion and a rectangular frame-shaped upper portion, and is welded to the outer surface (the surface facing the outer side in the width direction) of the side wall portion 13. More specifically, among the outer surfaces of the side wall portion 13, the base portion is irradiated with a welding laser from the inside in the width direction of the side wall portion 13 in a state where the base portion 82a is in contact with the edge portion of the mounting hole 13b. 82a is welded to the outer surface of the side wall portion 13. At the time of laser irradiation, the laser is irradiated along the outer edge of the substantially inverted keyhole type mounting hole 13b. This makes it possible to increase the welding strength as compared with the case of irradiating the laser in a simple circular shape. Further, when irradiating the laser as described above, welding can be performed at a position distant from the reclining shaft 81 as compared with the case of irradiating the laser in a simple circular shape. Further, by irradiating the laser as described above, the upper end portion of the base portion 82a is welded. As a result, the welding strength at the upper end portion of the base portion 82a provided with the overhanging portion 82b is increased, and the supporting state of the overhanging portion 82b receiving the urging force from the spiral spring 85 can be stabilized.

A reclining device 80 (strictly speaking, a casing of the reclining device 80) is welded to the surface of the base portion 82a located on the side opposite to the side wall portion 13. Further, the spiral spring 85 is arranged outside the reclining device 80 in the width direction. Furthermore, in the present embodiment, the second bracket 83 and the third bracket 84 are interposed between the reclining device 80 and the spiral spring 85 in the width direction.

The second bracket 83 is joined (welded) to the reclining device 80 on the side opposite to the first bracket 82. Further, as shown in FIG. 13, a circular hole-shaped through hole 83a is formed in the second bracket 83. A portion of the reclining shaft 81 that protrudes outward in the width direction from the casing of the reclining device 80 is inserted through the through hole 83a.

As shown in FIG. 13, the third bracket 84 has a ring-shaped base portion 84a and an overhanging portion 84b protruding outward in the width direction from the upper end portion of the base portion 84a. The base portion 84a is welded to the outer surface of the second bracket 83 (the surface opposite to the side to which the reclining device 80 is welded). More specifically, of the outer surface of the second bracket 83, the welding laser is irradiated from the outside in the width direction of the second bracket 83 with the base portion 84a in contact with the edge of the through hole 83a. By doing so, the base portion 84a is welded to the outer surface of the second bracket 83. The other end of the spiral spring 85 is locked to the overhanging portion 82b. Then, one end of the spiral spring 85 is locked to the overhanging portion 82b of the first bracket 82, and the other end portion is locked to the overhanging portion 84b of the third bracket 84 to move the seat back S1 forward. Is urging.

According to the configuration described above, in the present embodiment, the reclining device 80 is appropriately attached to the side frame 10 made of a relatively thin steel material.

10 Side frame 10a Closed cross-section structure 10b Open cross-section structure 10s, 10t End 10v, 10w Overlapping part (two parts)
10u Relief part 10x Adjacent area 10y Separation area 11 Outer part 12 Inner part 13 Side wall part 13a Flange part 13b Mounting hole 13x Engagement hole 13y, 13z Insert hole 14 Rear wall part 14a Flange part 14b Rear wall part bead 15 Parts upper part 16 parts Central part 17 Part lower part 20 First concave part (recessed part)
21 Second recess (recess)
22 Convex bead 23 Vulnerable part 30 Upper frame (connecting frame)
31 Horizontal part (first extension part)
31a Raised part 32 Downward extension part (second extension part)
32a Lower end 32b Oblique 33 Contact plate 34 Pillar guide 50 Lower member frame 60 S Spring (support member)
70 Force cloth mounting clip (force cloth mounting member)
80 Reclining device 81 Reclining shaft 82 First bracket 82a Base 82b Overhang 83 Second bracket 83a Through hole 84 Third bracket 84a Base 84b Overhang 85 Swirling spring C Closed space F1 Seat back frame F2 Seat cushion frame Q Gap RL Lower Rail RU Upper Rail S This seat (vehicle seat)
S1 Seat back S2 Seat cushion S3 Headrest P Pad material W Skin material XL Rotating link

Claims (13)

A seat back frame of a seat back that is connected to the seat cushion of a vehicle seat via a reclining device.
It has side frames provided at both ends of the vehicle seat in the width direction .
The side frame
A closed cross-section structure portion that forms one end in the extension direction of the side frame and has a closed cross-section structure whose cross section intersects the extension direction.
It is provided with an open cross-section structure portion that forms a portion continuous with the closed cross-section structure portion in the extension direction and has an open cross-section structure.
Mounting holes for mounting the airbag mounting member and
A recess formed by denting inward from the position of the mounting hole in the width direction of the vehicle seat is provided.
A seat back frame characterized in that the recess is formed at a position between the mounting hole and the reclining device. The seat back frame according to claim 1 , wherein the recess is formed longer than the mounting hole in the vertical direction of the vehicle seat. The seat back frame according to claim 1 or 2 , wherein the recess is formed longer than the mounting hole in the front-rear direction of the vehicle seat. Any one of claims 1 to 3, wherein the mounting hole comprises at least two holes, an upper mounting hole provided above the side frame and a lower mounting hole provided below the upper mounting hole. The seat back frame described in item 1. The seat back frame according to claim 4, wherein the upper mounting hole is provided between the closed cross-sectional structure portion and the recessed portion. The seat back frame according to claim 4 or 5, wherein the recess is further formed at a position between the upper mounting hole and the lower mounting hole. Any one of claims 4 to 6, wherein the recess is provided at a position where the vehicle seat is vertically overlapped with respect to both the upper mounting hole and the lower mounting hole. The seat back frame described in. The seat back frame according to any one of claims 1 to 7, wherein the reclining device is attached to an outer surface of the recess. One of claims 1 to 8, wherein the recess is composed of a second recess to which the reclining device is attached and a first recess provided above the second recess. The seat back frame described in item 1. The seat back frame according to claim 9, wherein the first recess overlaps the closed cross-sectional structure portion in the front-rear direction of the vehicle seat. A seat frame comprising the seat back frame according to any one of claims 1 to 10 . The seat frame according to claim 11 and
The pad material placed on the seat frame and
A vehicle seat including a skin material that covers the surface of the pad material . The vehicle seat is
The vehicle seat according to claim 12, wherein the seat cushion is attached to an upper rail that can slide and move along a lower rail fixed to a vehicle body floor.

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