JP2019081547A - Seat frame - Google Patents

Abstract

To allow a closed cross sectional structure part and an opened cross sectional structure part to be appropriately provided in side frames.SOLUTION: Side frames 10 provided at both end parts in a width direction of a vehicular seat have: a closed cross sectional structure part 10a constituting one end part in a frame extension direction and an opened cross sectional structure part 10a constituting a part continuous to the closed cross sectional structure part 10a in the frame extension direction. Further, a clearance Q formed resulting from discontinuity of the continuous part in the cross section of the opened cross sectional structure part 10b becomes larger in a separated region 10y disposed at a position separated from the closed cross sectional structure part 10a in the frame extension direction than in an adjacent region 10x adjacent to the closed cross sectional structure part 10a in the frame extension direction, of the opened cross sectional structure part.SELECTED DRAWING: Figure 6

Description

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

  In order to reduce the weight of the vehicle seat, it is generally considered to reduce the thickness of each part of the seat frame. However, as the thickness of each part of the seat frame is reduced, the rigidity of the part is lowered. On the other hand, when securing rigidity in a seat frame, it is conceivable to make the cross-sectional structure of the part which should ensure the said rigidity etc. into a closed cross-section structure. If an example is given and demonstrated, in the seat frame given in patent documents 1, the side frame of a seat back frame has closed section structure.

JP, 2014-88133, A

  Describing in detail the seat frame described in Patent Document 1, 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. In such a configuration, although rigidity can be secured for the side frame, it is difficult to reduce the weight of the seat frame sufficiently. Then, it is possible to make a closed cross-section structure part and an open cross-section structure part coexist in a side frame as a structure for making rigid ensuring and weight reduction compatible. However, if the cross-sectional shape changes rapidly at the boundary between the closed cross-sectional structure and the open cross-sectional structure, problems such as a significant decrease in rigidity at the boundary or stress concentration may occur.

  Further, there is a seat frame provided with a frame (connection frame) connecting the side frames. In such a seat frame, when the closed cross-sectional structure and the open cross-sectional structure coexist in the side frame, the connection frame is properly attached to the side frame in consideration of the positional relationship between the connection frame and the side frame. Is required.

  In addition, the side frame may be attached with another member, for example, a support member for supporting an occupant or a web attachment member for attaching a webbing of an air bag. When attaching the above members to the side frame in the configuration in which the closed cross-sectional structure portion and the open cross-sectional structure portion coexist in the side frame, it is required to attach them at a suitable position for performing the mounting operation smoothly. .

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a seat frame capable of appropriately causing a closed cross-sectional structure and an open cross-sectional structure to coexist in a side frame. It is.
In addition, another object of the present invention is to be able to appropriately attach a connecting frame for connecting side frames to a side frame in which a closed cross-sectional structure and an open cross-sectional structure are properly present. It is to provide a seat frame.
Further, a third object of the present invention is to attach a support member for supporting an occupant and a force cloth of an air bag to a side frame in which a closed cross-sectional structure portion and an open cross-sectional structure portion appropriately exist. It is an object of the present invention to provide a seat frame to which a webbing attachment member can be properly attached.

  According to the seat frame of the present invention, the subject is a seat frame having side frames provided at both ends in the width direction of a vehicle seat, wherein the side frame is one end in the extending direction of the side frame A closed cross-sectional structure having a closed cross-sectional structure and a cross section intersecting with the extending direction, and a portion continuous with the closed cross-sectional structure in the extending direction; An open cross-section structure part, and a gap formed by disconnection of a continuous part in the cross-section of the open cross-section structure part is the gap in the extension direction of the open cross-section structure part; Solved by the fact that the distance between the closed cross-sectional structure and the distance between the closed cross-sectional structure and the adjacent cross-sectional structure is larger than that of the adjacent region located adjacent to the closed cross-sectional structure. It is.

  In the seat frame of the present invention configured as described above, the closed cross-sectional structure and the open cross-sectional structure coexist in the side frame. In addition, a gap formed by breaking a continuous portion in the cross section of the open cross-sectional structure is located farther away from the closed cross-sectional structure than the adjacent region located adjacent to the closed cross-sectional structure. Is larger in the separated area. That is, the degree of opening in the cross section of the open cross-section structure part is larger in the separated region than in the adjacent part. With such a configuration, it is possible to suppress a rapid change in the cross-sectional shape at the boundary between the closed cross-sectional structure and the open cross-sectional structure in the side frame, and to reduce the rigidity due to the rapid change in the cross-sectional shape. It is possible to suppress stress concentration.

Further, in the seat frame described above, the gap in the adjacent area may be larger as it is at a position farther from the closed cross-sectional structure in the extension direction.
In the above configuration, the gap in the adjacent region (in other words, the degree of opening of the cross section) gradually increases as the distance from the closed cross-section structure part increases. This makes it possible to more effectively suppress the change in cross-sectional shape at the boundary between the closed cross-sectional structure and the open cross-sectional structure.

Further, in the seat frame described above, the separation area has a pair of end portions located at positions adjacent to the gap among the continuous parts in the cross section, and the pair of ends the separation area has At least one end of the portions may be folded back to have two portions overlapping in the width direction, and the two portions may be joined to form a closed space.
In the above configuration, at least one end of the pair of ends of the separation region is folded back. In addition, the end has two portions that overlap in the width direction by being folded back, and the two portions are joined to form a closed space. This makes it possible to improve the strength of the separation region.

The seat frame may further include a connection frame connecting the side frames, the connection frame including a first extension extending in the width direction and the first extension in the width direction. A second extending portion located on both sides of the portion and extending toward the side frame, and the second extending portion enters inside one end in the extending direction of the closed cross-section structure portion The adjacent region may be adjacent to the other end of the closed cross-sectional structure in the extension direction.
In the above configuration, the second extension of the connection frame is inserted inside the extension direction one end of the closed cross-section structure, and the adjacent region is adjacent to the other end of the closed cross-section structure. ing. With such a positional relationship, it is possible to properly arrange the connecting frames and to properly connect the side frames by the connecting frames.

Further, in the seat frame described above, it is preferable that a portion of the second extending portion which is inward of one end in the extending direction of the closed cross-section structure portion is joined to the closed cross-section structure portion.
In the above-described configuration, a portion of the second extending portion that is inward of one end in the extending direction of the closed cross-sectional structure is joined to the closed cross-sectional structure. With such a configuration, it is possible to more appropriately attach the connecting frame to the side frame.

Further, in the seat frame described above, the length in the extension direction of the adjacent area may be shorter than the length in the extension direction of the closed cross-section structure part.
According to the above configuration, since the length of the lower rigid adjacent region of the adjacent regions is set to be shorter, it is possible to improve the rigidity of the side frame.

In the seat frame described above, the adjacent region has a pair of end portions located adjacent to the gap in the continuous portion of the cross section, and the width direction is used to support the occupant. And a supporting member mounted between the side frames is attached to the side frame, the mounting position of the supporting member is the same position as the adjacent area in the extension direction, and the adjacent area is It is good if it is a position away from the pair of ends which it has.
In the above configuration, the attachment position of the support member in the side frame is the same position as the adjacent area in the extension direction, and is a position apart from the pair of ends of the adjacent area. With such a positional relationship, the support member can be appropriately attached to the side frame without interfering with the pair of ends of the adjacent region.

Further, in the above seat frame, the adjacent region has a pair of end portions located at positions adjacent to the gap among the portions continuous in the cross section, for attaching the air bag fabric. A fabric attachment member is attached to the side frame, the attachment position of the fabric attachment member is the same position as the adjacent region in the extension direction, and the pair of ends of the adjacent region have It is good to be away from
In the above configuration, the attachment position of the webbing attachment member in the side frame is the same position as the adjacent area in the extension direction, and is a position apart from the pair of ends of the adjacent area. With such a positional relationship, the webbing attachment member can be appropriately attached to the side frame without interfering with the pair of ends of the adjacent region.

Further, in the above-described seat frame, the attachment position of the webbing attachment member may be a position facing one end of the pair of ends of the adjacent area in the width direction.
In the above configuration, the attachment position of the webbing attachment member in the side frame is a position facing in the width direction one end of the pair of ends of the adjacent region. With such a positional relationship, it is possible to attach the webbing attachment member by effectively utilizing the space adjacent to the one end in the width direction.

Further, in the seat frame described above, the separation area has a pair of end portions located at positions adjacent to the gap among the continuous parts in the cross section, and the pair of ends the separation area has Among the parts, at least one end is folded back and has two parts overlapping in the width direction, and a webbing attachment member for attaching a webbing of an air bag is attached to the side frame, The attachment position of the webbing attachment member may be a position out of one of the two parts.
In the above configuration, at least one end of the pair of ends of the separated region has two portions overlapping in the width direction by being folded back. This makes it possible to improve the strength of the separation region. Moreover, in said structure, the attachment position of the webbing attachment member in a side frame is a position which remove | deviated from one part among said two parts. With such a configuration, the webbing attachment member can be appropriately attached to the side frame without interfering with the one portion.

Further, in the above-mentioned seat frame, the webbing attachment member is attached to a peripheral position of the one portion in the side frame, and is formed to cross the webbing attachment member in the one portion. It is recommended that a relief be provided.
In the above configuration, the relief portion is formed in one of the two overlapping portions at at least one end of the separated region. With such a configuration, interference with the one portion can be more effectively avoided, and the webbing attachment member can be appropriately attached to the side frame.

Further, in the seat frame described above, the separation area has a pair of end portions located at positions adjacent to the gap among the continuous parts in the cross section, and the pair of ends the separation area has Among the parts, at least one end is folded back and has two parts overlapping in the width direction, and the side frame is a reinforcing part formed at the same position as the two parts in the extension direction And a fragile portion formed at a position rearward of the reinforcing portion.
In the above configuration, the reinforcing portion for enhancing the strength of the side frame is provided at the same position as the position where one end of the separated region in the extending direction is folded back. With such a positional relationship, it is possible to more effectively exhibit the reinforcing effect by the reinforcing portion. Further, by providing the fragile portion at the rear of the reinforcing portion, for example, when a load is input at the time of a rear collision, it is possible to reduce the impact by deforming the side frame based on the fragile portion.

According to the seat frame of the present invention, in the side frame, the abrupt change of the sectional shape at the boundary between the closed sectional structure and the open sectional structure is suppressed, and the rigidity is reduced due to the abrupt change of the 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-section structure part increases, thereby changing the cross-sectional shape at the boundary between the closed cross-section structure part and the open cross-section structure part. It becomes possible to suppress effectively.
Further, according to the seat frame of the present invention, it is possible to improve the strength of the separation area.
Further, according to the seat frame of the present invention, it is possible to appropriately arrange the connecting frame and to favorably connect the side frames by the connecting frame.
Further, according to the seat frame of the present invention, the connecting frame is joined to the closed cross-section structure by joining the part of the second extension part that has entered the inside in the extension direction one end of the closed cross-section structure. It becomes possible to attach more appropriately to a frame.
Further, according to the seat frame of the present invention, the rigidity of the side frame can be improved by setting the length of the adjacent region with lower rigidity in the adjacent region 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 webbing attachment member to the adjacent area of the side frame.
Further, according to the seat frame of the present invention, it is possible to attach the webbing attachment member by effectively utilizing the space in the adjacent area.
Further, according to the seat frame of the present invention, it is possible to appropriately attach the webbing attachment member to the separation area of the side frame.
Further, according to the seat frame of the present invention, when attaching the webbing attachment member appropriately to the separation region of the side frame, the interference of the part of the separation region with the webbing attachment member is effectively avoided. It becomes possible.
Further, according to the seat frame of the present invention, the side frame is deformed based on the fragile portion when a load is inputted at the time of a vehicle rear collision while the reinforcement effect by the reinforcement portion is more effectively exhibited. It is possible to ease the

BRIEF DESCRIPTION OF THE DRAWINGS It is a general 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 from diagonally front. It is a figure when the seat frame which concerns on one Embodiment of this invention is seen from diagonally backward. It is a schematic cross section which shows the location where a pillar guide is welded in a connection 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 seeing one part which comprises a side frame from the side. It is a figure when the other parts which comprise 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 from diagonally 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 a 1st modification. It is a figure which shows a 2nd modification. It is a figure which shows a reclining apparatus and its attachment components.

  Hereinafter, an embodiment of the present invention will be described. The embodiments described below are merely examples for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and the present invention naturally includes the equivalents thereof. Furthermore, in the following description, the contents relating to the material, shape, and size of each device and its component parts are merely specific examples, and the present invention is not limited thereto. That is, the materials, shapes, and sizes of the devices and their component parts can be freely designed as long as the specific matters of the present invention are satisfied.

  Further, in the following description, the “front-rear direction” means the front-rear direction of the vehicle seat, and more specifically, a direction coinciding with the traveling direction of the vehicle. Further, the “width direction” means the width direction of the vehicle seat, and more specifically, is a direction coincident with the vehicle width direction (left-right direction).

  Furthermore, in the following description, it is assumed that the vehicle seat is in a use state (a state in which a seated person can be seated), unless otherwise specified. That is, in the following description, the attitude, the position, the positional relationship with other members, and the like of each part of the vehicle seat are the contents when the vehicle seat is in use.

<< About the basic configuration of the vehicle seat and seat frame >>
First, the basic configuration of the vehicle seat (hereinafter, the present seat S) and the seat frame F forming the frame according to the present embodiment 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 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 lower portion of the headrest S3 is provided with a pair of headrest pillars (not shown) extending downward. The headrest S3 is supported by the upper end portion of the seatback S1 (strictly, the seatback frame F1) via the pair of headrest pillars.

  As shown in FIGS. 2 and 3, the seat S includes a seat back frame F1 of the seat back S1 and a seat cushion frame F2 of the seat cushion S2. The seat cushion frame F2 is connected to the upper rail RU of the slide rail apparatus R disposed at the lower part thereof. With this configuration, when the upper rail RU moves along the lower rail RL fixed to the vehicle body floor, the entire main seat S including the seat cushion frame F2 slides.

  In the present embodiment, the seat cushion frame F2 is connected to the upper rail RU via the pivot link XL as shown in FIG. The pivot link XL is a link member disposed on both sides of the seat cushion S2 in the width direction, and pivots about a pivot axis along the width direction. The position of the seat cushion S2 in the vertical direction is adjusted by rotating the pivotal link XL while rotating with the seat cushion S2.

  Further, a lower end portion of the seat back frame F1 is connected to a rear end portion of the seat cushion frame F2 via a 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 by the reclining device 80. That is, the seat back S1 can rotate relative to the seat cushion S2 about the reclining shaft 81 along the width direction.

  The present 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 a seat frame included in the present sheet S will be described in detail. In addition, the structure (especially structure of the side frame 10) demonstrated below is not applied only to the seat back frame F1, and is applicable also to the seat cushion frame F2.

<< About the detailed composition of the seat back frame >>
The configuration of the seat back frame F1 of the present sheet S will be described in detail with reference to FIGS. 2 and 3 already described and FIGS. 4 to 10. The seat back frame F1 has a rectangular frame when the seat frame F is viewed from the front as shown in FIG. Further, the seat back frame F1 is reduced in weight as compared to a seat back frame that a conventional general vehicle seat has. Specifically, a lighter material is used as a material (for example, a steel plate constituting a side frame 10 described later) constituting the seat back frame F1 than a material used in a conventional seat back frame . Furthermore, when fastening and connecting parts which comprise seat back frame F1, it is supposed that parts are fastened and connected by laser welding, without using fasteners, such as a bolt, a nut, and a screw. By adopting such a configuration, the seat back frame F1 according to the present embodiment is more lightweight.

  The structure of the seat back frame F1 will be described. As shown in FIGS. 2 and 3, the seat back frame F1 has a pair of side frames 10 provided at both widthwise ends. The seat back frame F1 has an upper frame 30 which connects the side frames 10 by being attached to the upper end of each side frame 10, as shown in the figure. Furthermore, the seat back frame F1 has a lower member frame 50 that connects the side frames 10 by being attached to the lower ends of the side frames 10, as shown in the figure. Furthermore, between the side frames 10, an S-spring 60 as a supporting member for supporting the back of the occupant from behind is installed.

Hereinafter, the upper frame 30, the lower member frame 50, and the side frame 10 will be described in order.
The upper frame 30 is a component formed in a downward U-shape in a front view, and corresponds to a connection frame. Further, in the present embodiment, the upper frame 30 is formed of a hollow pipe member made of metal. However, the present invention is not limited to this, and the upper frame 30 may be configured by a solid member. 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. And a downward extending portion 32. Each downward extending portion 32 extends downward toward the side frame 10, and a lower end 32a thereof is joined to the upper portion of the side frame 10.

  In the lower extending portion 32, a portion positioned below the lower end portion 32a (hereinafter, the oblique portion 32b) is diagonally extended so as to extend outward in the width direction toward the lower side. Moreover, as shown in FIG.2 and FIG.3, between the lower end parts of the diagonal part 32b, the communication plate 33 extended along the width direction is constructed. Of the connection plate 33, both widthwise end portions are fixed to the oblique portion 32b by laser welding. Further, both widthwise end portions of the communication plate 33 are curved so as to be displaced rearward as it extends inward in the width direction from the portion fixed to the oblique portion 32b.

  On the front surface of the horizontal portion 31 of the upper frame 30, a rectangular cylindrical pillar guide 34 for supporting the headrest pillar is attached. The pillar guides 34 are provided in a pair at intervals in the width direction. Moreover, the part to which the pillar guide 34 is attached among the horizontal parts 31 is crushed so that the front surface may become flat. The pillar guide 34 is fixed to a portion which is flattened and which is flat.

  In addition, when a cross section orthogonal to the width direction is seen in a portion where the pillar guide 34 is fixed in the horizontal portion 31, as shown in FIG. 4, a portion raised upward and downward by crushing (hereinafter referred to as a raised portion 31a) is formed. In the present embodiment, the pillar guide 34 is fixed by using the raised portion 31 a. More specifically, the projection 31 a and the pillar guide 34 are laser welded by irradiating the welding laser from the rear of the projection 31 a in a state where the front surface of the projection 31 a and the rear surface of the pillar guide 34 are in contact with each other. There is. Incidentally, in FIG. 4, the raised portions 31 a are illustrated somewhat larger than the actual size in order to make the description easy 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 bridged between lower end portions of the side frames 10 (strictly, between lower end portions of the rear wall portion 14 of the outer part 11 described later). The upper and lower edges of the lower member frame 50 are each bent forward to form a flange.

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

  The side frame 10 has a spindle-like external shape in side view as shown in FIG. 5A. That is, when the side frame 10 is viewed from the side, the front end portion of the side frame 10 bulges in a circular arc shape from the middle position in the vertical direction. When the main sheet S is in use (more strictly, when the seat back S1 is at the reference position), the side frame 10 is in a direction slightly inclined (backwardly inclined) with respect to the vertical direction. Extended for a long time. Incidentally, in the following, the extension direction of the side frame 10 will be referred to as “frame extension direction”.

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

  In the present seat S, the length of a portion of the lower end 32 a of the lower extending portion 32 joined to the upper end of the side frame 10 is shorter than that of the conventional vehicle seat. This is to make the present 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 formed of a thin steel plate, more specifically, an ultra-high tensile steel plate having a thickness of 1 mm or less. Furthermore, the side frame 10 according to the present embodiment is configured by bonding a plurality of frame pieces, specifically, two frame pieces. More specifically, each side frame 10 has the outer part 11 shown in FIG. 5B and the inner part 12 shown in FIG. 5C as components. All of these parts are formed by processing an ultra-high tensile steel plate.

  Outer part 11 is equivalent to one frame piece among a plurality of frame pieces which constitute side frame 10, and mainly constitutes a portion in the width direction outside in side frame 10. The inner parts 12 correspond to other frame pieces, and mainly constitute an inner part in the width direction in the side frame 10. Then, as shown in FIG. 6, the outer parts 11 and the inner parts 12 constitute the side frame 10 by being joined by laser welding in a state where the parts overlap each other. In FIG. 6, welding marks when laser welding is performed are illustrated by thick dashed lines.

  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 already described. First, in describing the structure of the side frame 10, the configuration of each 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 with the frame extending direction, and has a side wall portion 13 and a rear wall portion 14 as shown in FIGS. The side wall portion 13 is a portion located at an end portion in the width direction outer side in the side frame 10. 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 is provided with a flange portion 13a formed by bending inward in the width direction at a substantially right angle. The flange portion 13a is formed in 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 an S-spring 60 described later and the webbing attachment clip 70 are inserted into and engaged with these holes. The details of the above holes will be described later.

  Furthermore, at the lower part of the side wall 13, as shown in FIG. 5B, a mounting hole 13b for mounting the reclining device 80 is formed. A reclining device 80 is attached to the side wall portion 13 so that the reclining shaft 81 passes through the mounting hole 13b. In addition, in this embodiment, when attaching the reclining apparatus 80 to the side wall part 13, several attachment components are used. The attachment parts and the like of the reclining device 80 will be described later.

  The rear wall portion 14 is a portion provided 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 position (upper end position and lower end position) of the rear wall portion 14 in the same direction is substantially aligned with the end position of the side wall portion 13. In addition, a flange portion 14 a formed by bending the front wall portion at a substantially right angle is provided at an end portion on the inner side in the width direction of the rear wall portion 14. The flange portion 14 a is formed in 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 14 a is disconnected at a position immediately above the lower member frame 50 in the frame extension direction for the purpose of attaching the lower member frame 50 to the lower end portion of the rear wall portion 14.

  Furthermore, as shown in FIG. 3, on the rear surface of the rear wall portion 14, a bead (hereinafter, rear wall portion bead 14 b) formed in the frame extending direction is formed. The rear wall bead 14 b is provided to improve the rigidity of the rear wall 14 (in particular, the rigidity against the 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 14 b is formed such that its lower end reaches a position immediately above the lower member frame 50.

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

  The parts central portion 16 constitutes a portion adjacent to the lower end of the upper part 15 in the inner part 12 and extends obliquely downward from the lower end of the upper part 15. Further, as shown in FIG. 8, the cross section of the parts central portion 16 intersecting the frame extending direction is substantially V-shaped. And as shown in FIG.6 and FIG.7, the part center part 16 comprises the open cross-section structure part 10b of the side frame 10 by being combined and joined with the intermediate part of the outer parts 11 in a frame extension direction. ing. Strictly described, the part central portion 16 is joined to the front end portion of the side wall portion 13 of the outer part 11 to position the open cross-section structure portion 10b adjacent to the closed cross-section structure portion 10a in the frame extension direction. Constitute an adjacent area 10x. The open section structure portion 10b and the adjacent region 10x will be described in detail later.

  The part lower portion 17 constitutes a portion of the inner part 12 located below the part center portion 16 and extends out from the lower end of the part center portion 16 while curving in an arc shape. Further, as shown in FIG. 9, the cross section of the lower part 17 which intersects the frame extending direction is substantially S-shaped. The lower part 17 is formed to be somewhat narrower than the upper part 15 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 constitute the open cross-sectional structure portion 10 b of the side frame 10. Strictly described, the lower part 17 is joined to the front end of the side wall 13 of the outer part 11 so as to be separated from the closed cross-section structure 10 a in the frame extending direction in the open cross-section structure 10 b. The existing separation area 10y is configured. In particular, the lower part 17 constitutes only the front end of the separation area 10 y in the side frame 10. The separated area 10y will be described in detail later.

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

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

  On the other hand, as described above, in the present sheet S, in order to reduce the weight, the length (hereinafter referred to as the bonding length) of the portion of the lower extending portion 32 joined to the upper end of the side frame 10 is It is shorter than conventional vehicle seats. Here, if the bonding length is shortened, the supporting 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 a closed cross-sectional structure portion 10 a. In the closed cross-sectional structure portion 10a, the support rigidity is secured because of the closed cross-sectional structure. Further, as shown in FIG. 6, the closed cross-sectional structure 10 a extends such that the lower end of the closed cross-sectional structure 10 a is located below the lower end of the downward extension 32 in the frame extension direction. That is, for the portion of the side frame 10 located below the downward extending portion 32 (that is, the portion not joined to the downward extending portion 32), the support rigidity is achieved by the closed cross-sectional structure portion 10a. Is secured.

  As described above, in the present embodiment, the upper end of the side frame 10 is the closed cross-sectional structure 10a, and the lower extension 32 of the upper frame 30 is joined to the closed cross-sectional structure 10a. 10a extends below the lower end of the lower extension 32. This makes it possible to compensate for the reduced support stiffness by shortening the bonding length.

  In the present embodiment, as shown in FIG. 7, the closed cross-section structural portion 10 a is formed by joining by laser welding in a state where the upper part of the outer part 11 and the part upper part 15 of the inner part 12 overlap. It is done. More specifically, in the upper part of the outer part 11, the side wall part 13 and the flange part 14 a of the rear wall part 14 overlap the part upper part 15 of the inner part 12. The upper portion of the outer part 11 and the upper part 15 of the inner part 12 are joined by irradiating the overlapping portion with a welding laser along the frame extension direction. As described above, when the closed cross-section structure portion 10a is configured by superposing two parts, the strength of the closed cross-section structure portion 10a can be further enhanced, 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. Thereby, even if the closed cross-section structure portion 10a is extended below the lower end of the downward extension portion 32 while shortening the bonding 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 side frame 10 whole is made into a closed cross section structure, the weight of the side frame 10 will increase by that much. For this reason, in the present embodiment, only the upper end portion of the side frame 10 is the closed cross-sectional structure portion 10a, and the portion located below it is the open cross-sectional structure portion 10b. Here, the open cross-section structure portion 10b is a portion of the side frame 10 that is continuous with the closed cross-section structure portion 10a in the frame extension direction, and the cross section intersecting the frame extension direction has an open cross-section structure. That is, in the open cross-sectional structure portion 10b, as shown in FIGS. 8 and 9, the gap Q is formed by disconnection of the continuous portion in the above cross section.

  As described above, in the present embodiment, by setting only the upper end portion of the side frame 10 as the closed cross-section structure portion 10 a, while securing the support rigidity of the side frame 10, the weight of the seatback frame F 1 including the side frame 10 can be further enhanced. It becomes possible to reduce the weight.

  Furthermore, in the present embodiment, the open area structural portion 10b is an adjacent region 10x located at a position adjacent to the closed cross sectional structure portion 10a in the frame extending direction, and a separation region located at a position separated from the closed cross sectional structure portion 10a. It is divided into 10y and.

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

  Further, as shown in FIG. 8, the adjacent region 10 x has a pair of end portions 10 s and 10 t located at positions adjacent to the above-mentioned gap Q among the portions continuous in the cross section. Further, as shown in FIG. 8, each of the pair of end portions 10 s and 10 t of the adjacent region 10 x extends such that the tip of the end portion faces the gap Q in the cross section.

  The separation area 10y is an area of the open cross-sectional structure portion 10b located below the adjacent area 10x. The separated area 10y is formed by joining by laser welding in a state in which the lower part of the outer part 11 and the part lower part 17 of the inner part 12 overlap in the frame extending direction. More specifically, the flange portion 13 a of the side wall portion 13 of the lower portion of the outer part 11 overlaps the lower part 17 of the inner part 12. The lower portion of the outer part 11 and the lower part 17 of the inner part 12 are joined by irradiating the overlapping portion with a laser for welding along the frame extending direction. A separated region 10y is formed by the lower portion of the joined outer part 11 and the lower part 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 among portions continuous in the cross section. Of the pair of end portions 10s and 10t of the separation area 10y, the end portion 10s located on the front side is folded back and forth as shown in the figure. That is, the end 10s located on the more front side has two portions overlapping in the width direction (hereinafter, overlapping portions 10v and 10w). As described above, in the present embodiment, the strength of the open cross-section structure portion 10b including the separation region 10y is enhanced by folding back the end 10s located on the front side among the pair of end portions 10s and 10t of the separation region 10y. It is done.

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

  Furthermore, 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 10s located on the front side is folded back in the front-rear direction as described above, but in the present embodiment, it is folded back like a bag. That is, of the folded back end 10s, the area located further rearward is narrowed relative to the area located further forward, and the overlapping portions 10v and 10w are in contact with each other. The two overlapping portions 10v and 10w are joined by irradiating a welding laser to the two overlapping portions 10v and 10w in contact with each other. As a result, the end 10s located on the front side forms a closed space C. As described above, in the present embodiment, the end portion 10s located further to the front side forms the closed space C, whereby the strength of the open cross-section structure portion 10b including the separation region 10y is further enhanced.

  When joining the two overlapping portions 10v and 10w, the welding laser 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 on the inner side in the width direction) Laser irradiation).

  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 thereto. It is not a thing. As shown in FIG. 11, two overlapping portions 10 v and 10 w may be spaced apart from each other (that is, a configuration in which the end portion 10 s 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-section 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-sectional 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-section structure 10b becomes larger in the separated area 10y than in the adjacent area 10x. ing. With such a configuration, it is possible to suppress a rapid change in the cross-sectional shape at the boundary between the closed cross-sectional structure portion 10a and the open cross-sectional structure portion 10b. As a result, it is possible to suppress the decrease in rigidity and stress concentration of the side frame 10 caused by the rapid change in the cross-sectional shape.

  Furthermore, as described above, the above-mentioned gap Q in the adjacent region 10x is gradually larger as it is at a position farther from the closed cross-sectional structure portion 10a in the frame extension direction. As a result, it is possible to more effectively suppress the rapid change of the cross-sectional shape at the boundary between the closed cross-sectional structure portion 10a and the open cross-sectional structure portion 10b.

  The structure of the side frame 10 according to the present embodiment will be described in more detail. As shown in FIG. 5A, the length of the adjacent region 10x in the frame extension direction is shorter than the length of the closed cross-section structural portion 10a in the same direction. ing. That is, in the present embodiment, the adjacent region 10x which is lower in rigidity than the closed cross-sectional structure portion 10a is configured to be shorter than the closed cross-sectional structure portion 10a in the frame extension direction. Thus, in the present embodiment, the side frame 10 has higher rigidity than in the case where the adjacent region 10x is configured to be longer than the closed cross-sectional structure portion 10a.

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

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

  By the way, when the concave portion is provided in the side frame 10, the section coefficient of the portion where the concave portion is provided decreases, and in particular, it significantly changes in the portion where the upper end of the concave portion is positioned. On the other hand, in the present embodiment, in the side frame 10, the portion 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 the reduction of the cross-sectional coefficient in 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 of the side wall portion 13 (hereinafter, the second recess 21) is the outer surface of the side wall portion 13 (surface in the width direction outer side) Surface) is widely formed. Here, a part of the second concave portion 21 forms an end 10s that is positioned on the front side, of the pair of ends 10s and 10t that the separation region 10y has. 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, as shown in FIG. It is located inside.

  And the overlap part 10v located in the 2nd recessed part 21 is joined with the overlap part 10w which opposes this by laser welding. As described above, in the present embodiment, one of the two overlapping portions 10 v and 10 w to be joined is located in the second recess 21, that is, within the range in which the strength of the side frame 10 is enhanced. As a result, it is possible to secure the bonding strength when bonding the two overlapping portions 10v and 10w by laser welding. Here, the bonding strength means the stability of both abutting states in the step of bonding both of the two overlapping portions 10v and 10w.

  In the lower half of the side frame 10 in the side frame 10, as shown in FIG. 3 and FIG. 5B, a floating island-like bead (hereinafter referred to as a convex bead) surrounded by the second recess 21. 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, whereby the rigidity of the side frame 10 (in particular, the rigidity against the load input from the occupant to the upper portion of the seatback S1 at the time of a rear collision) ) To enhance. Further, the convex bead 22 is formed by raising a predetermined portion in the side frame 10 outward, and in the present embodiment, is formed to extend linearly in the front-rear direction.

  The convex bead 22 may be formed so that the position of each part 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. Further, in the present embodiment, the convex bead 22 is formed at the same height as the end portion 10s on the folded side of the pair of end portions 10s and 10t of the separation region 10y. If it explains more strictly, the formation position of convex bead 22 is in the frame extension direction, and it is in the almost same position as two parts (overlapping part 10v, 10w) which overlapped in end 10s turned over. Due to such 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 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. A configuration shown in FIG. 11 will be described. At the lower end portion of the rear wall portion 14, a fragile portion 23 extending in the width direction is formed. The fragile portion 23 is a portion serving as a deformation base point when the side frame 10 bends when an impact load of a predetermined size or more is applied at the time of a rear collision of a vehicle or the like, and is constituted by a hole portion, a concave portion or the like. The fragile portion 23 is provided at a position rearward of the convex bead 22 provided on the side wall portion 13. If it demonstrates more concretely, as shown in FIG. 11, it is good to form in the position which straddles the boundary part (corner part) of the side wall part 13 and the rear wall part 14. As shown in FIG. In the configuration as described above, it is assumed that the second convex bead 22 extending in the direction intersecting with the fragile portion 23 is provided in a portion of the rear wall portion 14 located above or below the fragile portion 23. Good.

<< About the attachment position of S spring in side frame >>
The seat back frame F1 which concerns on this embodiment is provided with the S spring 60 bridged between the side frames 10 in the width direction, as shown to FIG. 2 and FIG. On the other hand, the S spring 60 extends while meandering in the vertical direction along the width direction. Further, the end in the extension direction of the S spring 60 is hooked on an engagement hole 13 x formed in the side wall portion 13 of the outer part 11 in the side frame 10. Thus, the S spring 60 is attached to the side frame 10.

  Here, the formation position of the engagement hole 13x will be described. As can be seen by comparing FIGS. 5A and 5C, the engagement hole 13x is formed at the same position as the adjacent region 10x in the frame extension direction. Further, the engagement hole 13x is formed between a pair of end portions 10s and 10t of the adjacent region 10x in the front-rear direction. That is, in the present embodiment, the attachment position of the S spring 60 is the same position as the adjacent area 10x in the frame extension direction and is a position apart from the pair of end portions 10s and 10t of the adjacent area 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 attachment position of the rag attachment clip in the side frame >>
In the seat back frame F1 according to the present embodiment, a webbing attachment clip 70 illustrated in FIG. 10 is attached to the side frame 10 closer to the door of the vehicle. The webbing attachment clip 70 corresponds to a webbing attachment member, and is a component for attaching a webbing of an air bag (not shown). On the other hand, in the side wall portion 13 of the outer part 11 of the side frame 10, rectangular insertion holes 13y and 13z for inserting the webbing attachment clip 70 are formed. The webbing attachment clip 70 is attached to the side frame 10 by inserting a part of the webbing attachment clip 70 into the insertion holes 13y and 13z as shown in FIG.

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

  The upper insertion holes 13y are formed at the same position as the adjacent region 10x in the frame extension direction, as can be seen from the comparison of FIGS. 5A and 5B. Further, the upper insertion hole 13y is formed at a position shifted from each of the pair of end portions 10s and 10t of the adjacent region 10x in the width direction. If it explains concretely, upper insertion hole 13y is formed in a position which counters end 10s located in the front side among a pair of ends 10s and 10t which adjoining field 10x has in the cross direction. That is, in the present embodiment, the attachment position of the webbing attachment clip 70 inserted into the upper insertion hole 13y is the same position as the adjacent area 10x in the frame extension direction, and the pair of ends of the adjacent area 10x It is located away from 10s and 10t. With such a positional relationship, in the present embodiment, the webbing 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, a space is formed on the inner side in the width direction of the end portion 10s located on the front side among the pair of end portions 10s and 10t of the adjacent region. In the present embodiment, the webbing 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-described recesses (the first recess 20 and the second recess 21) are not formed. That is, it is formed in the part (non-recessed part) located more outside in the width direction. Further, in the present embodiment, as shown in FIG. 5B, the upper insertion hole 13y is located in front of the engagement hole 13x formed to attach the S spring 60. In other words, in the seat back frame F1 according to the present embodiment, the S spring 60 is disposed behind the webbing attachment clip 70 inserted into the upper insertion hole 13y.

  The lower insertion holes 13z are formed at the same position as the separation area 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 end (that is, the end 10s located on the front side) of the pair of the ends 10s and 10t of the separation region 10y that is folded back. There is. Specifically, as shown in FIG. 10, the end 10s has two portions (overlapping portions 10v and 10w) overlapping in the width direction by being folded back. On the other hand, the lower insertion hole 13z is formed at the rear of the inner overlapping portion 10w of the two portions 10v and 10w. More specifically, as shown in FIG. 5A, the lower insertion holes 13z are formed immediately behind the inner overlapping portion 10w. Further, in the present embodiment, in the overlapping portion 10w on the inner side, the portion located immediately before the lower insertion hole 13z forms a relief portion 10u by being cut out as shown in the figure. . The relief portion 10 u is a portion formed to intersect the webbing attachment clip 70 at the inner overlapping portion 102.

  That is, in the present embodiment, the attachment position of the webbing attachment clip 70 inserted into the lower insertion hole 13z is the same position as the separation area 10y in the frame extension direction, and one end of the separation area 10y has It is a position out of the overlapping portion 10 w located inside in the width direction in 10 s. Due to such positional relationship, in the present embodiment, the webbing attachment clip 70 is appropriately attached to the side frame 10 so as not to interfere with the overlapping portion 10 w described above.

  Further, a webbing attachment clip 70 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-like relief 10u is formed in the overlapping portion 10w. As a result, when the webbing attachment clip 70 inserted into the lower insertion hole 13z is attached to the side frame 10, interference with the overlapping portion 10w can be more effectively avoided.

  In the present embodiment, the end 10s of the pair of ends 10s and 10t of the separation region 10y, which is folded back, is relatively short in order to avoid interference with the webbing attachment clip 70. ing. Moreover, although the above-mentioned end 10s forms closed space C by joining two overlapping parts 10v and 10w, since the above-mentioned relief 10u is formed near the lower insertion hole 13z. As shown in FIG. 10, the closed space C is not opened but is open. However, the present invention is not limited to this, and in the configuration in which the formation position of the lower insertion hole 13z is shifted rearward from the position shown in FIG. 10 and the closed space C is formed also near the lower insertion hole 13z. It may be.

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

<< For installing the reclining device >>
In the present embodiment, the reclining device 80 is attached to the lower end portion of the seatback frame F1, more specifically, to the lower end portion of the side wall portion 13 of the outer part 11 constituting the side frame 10. If it demonstrates in more detail, the attachment hole 13b for attaching the reclining apparatus 80 is formed in the lower end part of the side wall part 13. As shown in FIG. The mounting hole 13b has a substantially inverted keyhole shape in side view, as shown in FIG. 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 13 and the reclining device 80 in the width direction, and the reclining device 80 is attached to the side wall 13 via the first bracket 82. There is. The first bracket 82 is made of a relatively thick steel plate, and as shown in FIG. 13, a substantially inverted keyhole type base 82a and an overhang 82b protruding outward in the width direction from the upper end of the base 82a. Have. One end of a spiral spring 85 is engaged with the projecting portion 82b. That is, the biasing force of the spiral spring 85 directly acts on the projecting portion 82b.

  The base portion 82a is formed of a ring-shaped lower portion and a rectangular frame-shaped upper portion, and is welded to the outer side surface (surface facing outward in the width direction) of the side wall portion 13. More specifically, in a state where the base 82a is in contact with the edge of the mounting hole 13b in the outer surface of the side wall 13, the laser for welding is applied from the width direction inner side than the side wall 13, 82 a is welded to the outer surface of the side wall 13. During the 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 to the case of irradiating the laser in a simple circular shape. Furthermore, in the case of irradiating the laser as described above, welding can be performed at a position away from the reclining shaft 81 as compared with the case of irradiating the laser in a simple circular shape. In addition, 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 where the overhanging portion 82b is provided is enhanced, and the support state of the overhanging portion 82b which receives the biasing force from the spiral spring 85 can be stabilized.

  Further, a reclining device 80 (strictly, a casing of the reclining device 80) is welded to the surface of the base portion 82a opposite to the side wall portion 13. Further, the spiral spring 85 is disposed 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 through hole 83 a in the form of a circular hole 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 84a and an overhanging portion 84b projecting outward in the width direction from the upper end of the base 84a. The base 84 a is welded to the outer surface of the second bracket 83 (surface opposite to the side on which the reclining device 80 is welded). More specifically, in a state in which the base 84 a is in contact with the edge of the through hole 83 a in the outer side surface of the second bracket 83, the laser for welding is irradiated from the width direction outer side than the second bracket 83. As a result, the base 84 a is welded to the outer surface of the second bracket 83. The other end of the spiral spring 85 is engaged with the projecting portion 82b. One end of the spiral spring 85 is engaged with the projecting part 82b of the first bracket 82, and the other end is engaged with the projecting part 84b of the third bracket 84, whereby the seatback S1 is moved forward. I am biased.

  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 area 10x Adjacent area 10y Spacing area 11 Outer part 12 Inner part 13 Side wall 13a Flange 13b Mounting hole 13x Engaging hole 13y, 13z Insertion hole 14 Rear wall 14a Flange 14b Rear wall bead 15 Parts Upper 16 parts Central part 17 Parts lower part 20 First concave part (concave part)
21 second recess (recess)
22 convex bead 23 fragile portion 30 upper frame (connection frame)
31 horizontal part (first extension part)
31a ridge 32 downward extension (second extension)
32a lower end portion 32b oblique portion 33 communication plate 34 pillar guide 50 lower member frame 60 S spring (supporting member)
70 Force cloth attachment clip (force cloth attachment member)
80 reclining device 81 reclining shaft 82 first bracket 82a base 82b projecting part 83 second bracket 83a through hole 84 third bracket 84a base 84b projecting part 85 spiral spring C closed space F1 seat back frame F2 seat cushion frame Q gap RL lower rail RU upper rail S main seat (vehicle seat)
S1 Seat back S2 Seat cushion S3 Headrest P Pad material W Skin material XL Rotating link

Claims (12)

A seat frame having side frames provided at both ends in the width direction of a vehicle seat,
The side frame is
A closed cross-sectional structure portion which forms an end in the extending direction of the side frame and which has a closed cross-sectional structure in a cross section intersecting the extending direction;
An open cross-section structure part which is a part continuous with the closed cross-section structure part in the extension direction, and the cross-section has an open cross-section structure;
A gap formed by breaking a continuous portion in the cross section of the open cross-sectional structure is adjacent to the open cross-sectional structure at a position adjacent to the closed cross-sectional structure in the extension direction A seat frame characterized in that it is larger in a separation area located at a position distant from the closed cross-section structure part in the extension direction than the area.   2. The seat frame according to claim 1, wherein the gap in the adjacent region is so large that the gap is located farther from the closed cross-sectional structure in the extending direction. The separated region has a pair of end portions located adjacent to the gap among the continuous portions in the cross section,
At least one end of the pair of ends of the separated region has two portions overlapping in the width direction by being folded back, and the two portions are joined to form a closed space The seat frame according to claim 1 or 2, characterized in that: A connecting frame connecting the side frames;
The connecting frame includes: a first extending portion extending in the width direction; and a second extending portion positioned on both sides of the first extending portion in the width direction and extending toward the side frame. Equipped with
The second extending portion is inserted inside one end in the extending direction of the closed cross-section structure portion,
The said adjacent area | region adjoins the other end part in the said extension direction of the said closed cross-section structure part, The seat frame as described in any one of the Claims 1 thru | or 3 characterized by the above-mentioned.   The portion of the second extending portion, which is located inside the one end in the extending direction of the closed cross-section structure portion, is joined to the closed cross-section structure portion. Seat frame.   The seat frame according to claim 3, wherein the length in the extension direction of the adjacent region is shorter than the length in the extension direction of the closed cross-section structure part. The adjacent region has a pair of end portions adjacent to the gap in the continuous portion in the cross section,
A support member mounted between the side frames in the width direction for supporting an occupant is attached to the side frames,
The mounting position of the support member is the same position as the adjacent area in the extension direction, and is a position apart from the pair of ends of the adjacent area. Seat frame according to any one of the above. The adjacent region has a pair of end portions adjacent to the gap in the continuous portion in the cross section,
A webbing attachment member for attaching a webbing of the air bag is attached to the side frame,
The attachment position of the webbing attachment member is the same position as the adjacent area in the extension direction, and is a position apart from the pair of ends of the adjacent area. Seat frame according to any one of the preceding claims.   The seat frame according to claim 8, wherein the attachment position of the webbing attachment member is a position facing one end of the pair of ends of the adjacent area in the width direction. . The separated region has a pair of end portions located adjacent to the gap among the continuous portions in the cross section,
At least one end of the pair of ends of the spaced region has two portions that overlap in the width direction by being folded back,
A webbing attachment member for attaching a webbing of the air bag is attached to the side frame,
The seat frame according to any one of claims 1 to 7, wherein the attachment position of the webbing attachment member is a position deviated from one of the two parts. The webbing attachment member is attached to a peripheral position of the one portion in the side frame,
The seat frame according to claim 10, wherein the one portion is provided with a relief formed to cross the webbing attachment member. The separated region has a pair of end portions located adjacent to the gap among the continuous portions in the cross section,
At least one end of the pair of ends of the spaced region has two portions that overlap in the width direction by being folded back,
The side frame includes a reinforcing portion formed at the same position as the two portions in the extending direction, and a weak portion formed at a position rearward of the reinforcing portion. 11. Seat frame according to any one of the preceding claims.

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