JP2018162032A - Vehicular sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity of a portion where side frame pieces overlap each other in a side frame.SOLUTION: In a vehicular sheet including a seat back frame, a side frame (10) of the seat back frame has a first side frame piece (20) and a second side frame piece (30) which partially overlap each other in its extension direction, and in an overlapping portion (40) where both the first side frame piece (20) and the second side frame piece (30) overlap each other in the side frame (10), the side frame pieces overlap each other in a state where a plurality of closed regions (41 and 42) surrounded by both of the side frame pieces is formed in a cross section of the overlapping portion (40) intersecting with the extension direction of the side frame (10).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle seat including a frame therein, and more particularly, to a vehicle seat in which a side frame positioned at a side end portion of a frame is configured by overlapping a plurality of side frame pieces.

  Some vehicle seats that include a frame inside are configured such that a side frame positioned at a side end of the frame is formed by overlapping a plurality of side frame pieces (for example, see Patent Document 1). In the seat device described in Patent Document 1, the side frame of the seat back frame is vertically divided into two, and the upper frame piece and the lower frame piece partially overlap each other.

  If the side frame is composed of multiple side frame pieces, the size of one side frame piece can be unified between products, and the size of the remaining side frame pieces can be changed between products, so the seat size can be easily changed. It becomes possible. That is, if the side frame is constituted by a plurality of side frame pieces, it is possible to flexibly cope with variations in seat size.

JP 2014-129006 A

  In the side frame constituted by a plurality of side frame pieces, the side frame pieces are partially overlapped with each other, but it is necessary to ensure sufficient rigidity for the portion where the side frame pieces overlap each other.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat in which the rigidity of a portion where side frame pieces overlap each other in the side frame is ensured.

  According to the vehicle seat of the present invention, the subject is a vehicle seat provided with a frame therein, and a side frame located at a side end portion of the frame extends in a predetermined direction, In the overlapping portion where both the first side frame piece and the second side frame piece overlap in the side frame, the first side frame piece and the second side frame piece partially overlap in the extending direction. In the cross section of the overlapping portion intersecting with the extending direction, the two are overlapped in a state where a plurality of closed regions surrounded by both are formed and closed.

  In the vehicle seat of the present invention configured as described above, a plurality of closed regions enclosed by the side frame pieces are formed in the cross section of the portion where the side frame pieces overlap each other (overlapping portion). If a plurality of closed regions are formed in this way, the rigidity of the overlapping portion is higher than that of a configuration in which only one closed region is formed.

In the above configuration, the plurality of closed regions may be arranged in a direction intersecting each of the extending direction and the width direction of the vehicle seat in the cross section.
In the above configuration, the plurality of closed regions are arranged in a direction intersecting each of the extending direction of the side frame and the width direction of the vehicle seat. Thereby, it is possible to improve the rigidity of the overlapping portion in the direction in which the closed regions are arranged.

In the above-described configuration, the plurality of closed regions may include a first closed region and a second closed region that are different in the area occupied in the cross section.
In the above configuration, the first closed region and the second closed region having different widths are formed in the cross section of the overlapping portion. With such a configuration, when the rigidity of the overlapping portion is increased, it is possible to increase the rigidity by giving priority to the side where the wider closed area is located among the first closed area and the second closed area.

In the above configuration, the second side frame piece overlaps the first side frame piece in a state of being arranged closer to the center of the frame than the first side frame piece in the width direction of the vehicle seat. In the cross section, a portion located between the closed regions may be provided with a raised region in which the first side frame piece is raised toward the center of the frame in the width direction.
In said structure, the 2nd side frame piece is located inside a 1st side frame piece in the width direction (seat width direction) of the vehicle seat. Further, the first side frame piece is provided with a raised area as a reinforcing portion, and the raised area is raised toward the center of the frame. With such a configuration, it is possible to improve the rigidity of the side frame (strictly speaking, the first side frame piece) while suppressing the side frame from spreading outward in the seat width direction.

In the above configuration, the first side frame piece bends so that one of the plurality of closed regions has a corner portion of the second side frame piece in the cross section and a diagonal of the corner portion. It is good to be comprised by the bending part formed by.
In the above configuration, one of the plurality of closed regions is configured by the corner portion of the second side frame piece and the bent portion of the first side frame piece that forms a diagonal of the corner portion. If it is such a structure, the part in which the bending part is formed will come to be located inside a sheet | seat width direction among 1st side frame pieces. Accordingly, it is possible to improve the rigidity of the side frame (strictly speaking, the first side frame piece) while suppressing the side frame from spreading outward in the seat width direction as much as the bent portion is formed.

In the above configuration, the first side frame piece has a first end and a second end in a direction intersecting each of the extending direction and the width direction of the vehicle seat, and the first end Is extended toward the center of the frame in the width direction, and is positioned closer to the occupant than the second end when the occupant is seated on the vehicle seat, and the bent portion is In the width direction, it is good to be located outside the portion located closest to the center of the frame in the first end portion.
In the above configuration, in the seat width direction, the bent portion is located outside the front end portion in the extending direction of the end portion (first end portion) closer to the occupant in the first side frame piece. With such a configuration, it is possible to suppress a space where an occupant can enter between the side frames when the seat is seated from becoming narrow due to the formation of the bent portion.

In the above configuration, the frame includes a pair of the side frames that are separated from each other in the width direction of the vehicle seat, and a connection frame that connects the side frames in the width direction. The first side frame piece and the second side frame piece of the side frame partially overlap with one side frame piece in the width direction, and the connecting frame and the one side frame piece overlap each other. In the frame overlap portion, the cross section of the frame overlap portion that intersects the extending direction forms a closed cross section surrounded by the connection frame and the one side frame piece to form a closed cross section. The side frame pieces should overlap.
In the above configuration, the cross section of the portion where the side frame piece and the connecting frame overlap (frame overlap portion) is a closed cross section. With such a configuration, the rigidity of the frame overlapping portion can be ensured accurately.

In the above configuration, the first side frame piece and the second side frame piece have a first end and a second end in a direction intersecting each of the extending direction and the width direction of the vehicle seat. When the occupant is seated on the vehicle seat, the first end is located closer to the occupant than the second end, and the first side frame piece and the second side frame piece The first end of one side frame piece may be provided with a flange formed by bending toward the side where the second end is located.
In the above configuration, in either one of the side frame pieces, by bending toward the end (first end) closer to the occupant toward the side away from the occupant (side where the second end is located) A formed flange portion is provided. If it is such a structure, it will become possible to suppress affecting the quality (for example, riding comfort) of the vehicle seat by providing the flange part. Moreover, if it is a flange part comprised as mentioned above, it will become difficult to interfere with a surrounding member compared with the flange part bent toward the side where a passenger | crew is located.

According to the vehicle seat of the present invention, the rigidity of the portion where the side frame pieces overlap each other (overlapping portion) becomes higher.
Moreover, according to the vehicle seat of the present invention, the rigidity of the overlapping portion is improved in the direction in which the closed regions are arranged.
Moreover, according to the vehicle seat of the present invention, when increasing the rigidity of the overlapping portion, it is possible to increase the rigidity by giving priority to the side of the first closed area and the second closed area where the wider closed area is located. It becomes.
Further, according to the vehicle seat of the present invention, it is possible to improve the rigidity of the side frame while suppressing the side frame from spreading outward in the seat width direction.
Further, according to the vehicle seat of the present invention, the rigidity of the first side frame piece is improved while suppressing the side frame from spreading outward in the seat width direction by the amount of the bent portion formed in the first side frame piece. Is possible.
In addition, according to the vehicle seat of the present invention, it is possible to suppress a space where an occupant can enter between the side frames when the seat is seated from being narrowed due to the formation of the bent portion.
Further, according to the vehicle seat of the present invention, the rigidity of the portion where the side frame piece and the connecting frame overlap (frame overlapping portion) is ensured accurately.
Further, according to the vehicle seat of the present invention, it is possible to suppress the influence on the quality (for example, ride comfort) of the vehicle seat by providing the flange portion on one side frame piece. Furthermore, compared with the flange part bent toward the side where the occupant is located, it becomes difficult to interfere with surrounding members.

It is a figure which shows the external appearance of the vehicle seat which concerns on one Embodiment of this invention. It is a perspective view of the flame | frame which the vehicle seat which concerns on one Embodiment of this invention has. It is a front view of the flame | frame which the vehicle seat which concerns on one Embodiment of this invention has. It is a figure which shows the AA cross section of FIG. It is a figure which shows the BB cross section of FIG. It is a side view of a seat cushion frame.

  Hereinafter, a vehicle seat according to an embodiment (this embodiment) of the present invention will be described with reference to FIGS. Hereinafter, a vehicle seat will be described as an example of a vehicle seat, and a configuration example thereof will be described. However, the present invention can also be applied to a vehicle seat other than a vehicle seat, for example, a seat mounted on a ship or an aircraft.

  In the following description, the “front-rear direction” is the front-rear direction of the vehicle seat and is the direction that coincides with the traveling direction during vehicle travel. Further, the “seat width direction” is the width direction of the vehicle seat and is the direction that coincides with the left-right direction viewed from the occupant seated on the vehicle seat. The “vertical direction” is the vertical direction of the vehicle seat, and is the direction that coincides with the vertical direction when the vehicle is traveling on a horizontal plane. Further, “front view” means that the vehicle seat or a component part of the vehicle seat is viewed from the front side of the vehicle seat.

  In addition, as for the shape, position, posture and the like of each part of the seat described below, unless otherwise specified, the vehicle seat is in a normal state (the seat for the vehicle seat is in a seatable state, and each part of the seat is in a seatable position) It is the content when it is in the state.

<< Basic configuration of vehicle seat according to this embodiment >>
As shown in FIG. 1, the vehicle seat S includes a seat back S1, a seat cushion S2, and a headrest S3. The vehicle seat S has a frame inside the seat. More specifically, the seat back frame F1 shown in FIGS. 2 and 3 is arranged inside the seat back S1. The seat back S1 is configured by disposing a pad material such as urethane in front of the seat back frame F and covering the pad material with a skin material.

  2 and 3, the seat back frame F1 includes a pair of side frames 10 that are separated from each other in the seat width direction, and a connection frame 50 that connects the side frames 10 in the seat width direction.

  The side frame 10 is located at a side end portion of the seat back frame F1 and extends in a predetermined direction, strictly speaking, extends in a direction slightly inclined (rearly inclined) with respect to the vertical direction. The connection frame 50 is configured by a member different from the side frame 10 and connects upper ends of the pair of left and right side frames 10 (strictly speaking, upper ends of second side frame pieces 30 described later). In the present embodiment, the connecting frame 50 is assembled to the side frame 10 by being welded to the upper end portion of the side frame 10.

  Hereinafter, the structures of the side frame 10 and the connecting frame 50 will be described in detail with reference to FIGS.

  The side frame 10 according to the present embodiment is composed of two parts (side frame pieces) that are divided into upper and lower parts. More specifically, each side frame 10 is configured by combining a first side frame piece 20 positioned below and a second side frame piece 30 positioned further upward so as to be lined up and down. Yes.

  The first side frame piece 20 is made of a metal plate processed into a predetermined shape, and forms a lower portion of the side frame 10. The first side frame piece 20 has a lower portion (hereinafter referred to as a first side frame piece lower portion 21) and an upper portion (hereinafter referred to as a first side frame piece upper portion 22). As shown in FIG. 2, the first side frame piece lower portion 21 includes a side wall 21a that is substantially semicircular when viewed from the side, a rear wall 21b that extends inward in the seat width direction from the rear end of the side wall 21a, and The front wall 21c extends inward in the sheet width direction from the front end of the side wall 21a.

  The side wall 21a swells forward from the upper end position to the center position, and has a shape that gradually becomes narrower from the center position toward the lower end position. The rear wall 21b is provided from the upper end to the lower end of the side wall 21a, and slightly protrudes inward in the sheet width direction. The front wall 21c is provided from the upper end to the lower end of the side wall 21a. As shown in FIG. 2, the front wall 21c wraps around at the lower end of the side wall 21a and continues to the rear wall 21b. The extension amount (extension amount) of the front wall 21c in the seat width direction is shorter than the extension amount of the rear wall 21b. In other words, the rear wall 21b is positioned closer to the center of the frame than the front wall 21c. It is extended. Here, “the center of the frame” means the center position of the seat back frame F1 in the seat width direction (that is, a position equidistant from each of the pair of left and right side frames 10).

  As shown in FIGS. 2 and 3, the first side frame piece upper portion 22 is continuous with the first side frame piece lower portion 21 and extends upward from the upper end of the first side frame piece lower portion 21. The first side frame piece upper portion 22 includes a side wall 22a shown in FIGS. 2 and 3, a rear wall 22b shown in FIG. 4, and a front wall 22c shown in FIGS.

  The side wall 22 a is continuous with the side wall 21 a of the first side frame piece lower portion 21, and extends slightly longer along the extending direction of the side frame 10. Further, a reinforcing bead 22h is formed at the center portion in the front-rear direction of the side wall 22a as shown in FIG. This reinforcing bead 22h is a raised region formed by raising the side wall 22a outward in the seat width direction, and is formed long along the extending direction of the side frame 10 from the upper end of the side wall 22a.

  The rear wall 22b extends from the rear end of the side wall 22a toward the inner side in the sheet width direction (in other words, the center of the frame), and is provided from the upper end to the lower end of the side wall 22a. The rear wall 22b is continuous with the rear wall 21b of the first side frame piece lower portion 21.

  The front wall 22c extends from the front end of the side wall 22a toward the inside in the seat width direction (in other words, the center of the frame), and is provided from the upper end to the lower end of the side wall 22a. The front wall 22c is continuous with the front wall 21c of the first side frame piece lower portion 21. As shown in FIG. 4, the lateral width (length in the seat width direction) of the front wall 22c of the first side frame piece upper part 22 is somewhat shorter than the lateral width of the rear wall 22b of the first side frame piece upper part 22. It has become.

  In the present embodiment, the upper end of the front wall 22c is cut obliquely with respect to the extending direction of the side frame 10, as shown in FIGS.

  Here, the rear wall 22b and the front wall 22c correspond to end portions of the first side frame piece 20 in the front-rear direction (that is, the direction intersecting with the extending direction of the side frame 10 and the seat width direction). The front wall 22c corresponds to a first end located on the side closer to the occupant than the rear wall 22b when the occupant is seated on the vehicle seat S. The rear wall 22b corresponds to a second end portion located on the side farther from the occupant than the front wall 22c when the occupant is seated on the vehicle seat S. Further, in the first side frame piece upper portion 22, the rear end portion and the rear wall 22b of the side wall 22a are substantially orthogonal to each other to form a corner portion 22d, as shown in FIGS.

  The second side frame piece 30 constitutes an upper portion of the side frame 10 and is constituted by a metal plate. The second side frame piece 30 is bent a plurality of times to form a shape like a lip groove side steel. As shown in FIGS. 2 and 3, the second side frame piece 30 has a lower portion (hereinafter, second side frame piece lower portion 31) and an upper portion (hereinafter, second side frame piece upper portion 32).

  The second side frame piece lower portion 31 is overlapped with the first side frame piece upper portion 22. As described above, the first side frame piece 20 and the second side frame piece 30 partially overlap each other in the extending direction of the side frame 10 to constitute the side frame 10. In other words, the side frame 10 has an overlapping portion 40 configured by overlapping the first side frame piece upper part 22 and the second side frame piece lower part 31.

  As shown in FIG. 4, in the overlapping portion 40, the second side frame piece lower portion 31 is disposed on the inner side (in other words, closer to the center of the frame) than the first side frame piece upper portion 22 in the seat width direction. The first side frame piece upper part 22 is overlaid.

  The first side frame piece upper part 22 and the second side frame piece lower part 31 are joined by welding (more precisely, laser welding) in a state of being overlapped with each other. Here, the upper end of the front wall 22 c of the first side frame piece upper portion 22 is included in the welded portion of the first side frame piece upper portion 22 with the second side frame piece lower portion 31. The upper end of the front wall 22c of the first side frame piece upper part 22 is cut obliquely with respect to the extending direction of the side frame 10 as described above. For this reason, when welding the first side frame piece upper part 22 and the second side frame piece lower part 31, a longer welding margin (welding length) is secured at the upper end of the front wall 22 c of the first side frame piece upper part 22. It becomes possible.

  The structure of the second side frame piece lower portion 31 will be described. The second side frame piece lower portion 31 extends along the extending direction of the side frame 10, and the side wall 31a, the rear wall 31b, and the front shown in FIG. It has a wall 31c. The side wall 31 a extends along the extending direction of the side frame 10. The side wall 31a extends along the side wall 22a of the first side frame piece upper part 22 and has substantially the same width as the side wall 22a of the first side frame piece upper part 22 in the front-rear direction.

  As shown in FIG. 4, the rear wall 31b is substantially orthogonal to the side wall 31a and extends from the rear end of the side wall 31a toward the inside in the seat width direction (in other words, the center of the frame). The rear wall 31b is provided from the upper end to the lower end of the side wall 31a, and extends somewhat inward in the sheet width direction. Most of the rear wall 31b extends along the rear wall 22b of the first side frame piece upper part 22 and extends slightly inward from the rear wall 22b of the first side frame piece upper part 22 in the seat width direction. .

  Further, as shown in FIG. 4, the boundary portion between the side wall 31a and the rear wall 31b is bent in an L shape to form a bent portion 31d. The bent portion 31d is bent so that its apex (a portion corresponding to an L-shaped bending point) is closer to the inner side in the sheet width direction (in other words, the center of the sheet). Then, as shown in FIG. 4, the bent portion 31d has a corner 22d (that is, the side wall 22a and the rear wall) of the first side frame piece upper portion 22 in the overlapping portion 40 (strictly speaking, the cross section X1 of the overlapping portion 40). 22b) is provided at a diagonal position. In addition, about the magnitude | size of the bending part 31d, it is possible to design freely according to sheet | seat specification.

  Moreover, as shown in FIG. 4, the rear wall 31b is provided with a rear flange portion 31e for reinforcement. The rear flange portion 31e is formed by bending the inner end in the seat width direction (extension direction front end portion) of the rear wall 31b toward the front (that is, the side where the front wall 31c is located).

  As shown in FIG. 4, the front wall 31c is substantially orthogonal to the side wall 31a and extends from the front end of the side wall 31a toward the inside in the seat width direction (in other words, the center of the frame). The front wall 31c is provided from the upper end to the lower end of the side wall 31a and extends somewhat inward in the sheet width direction. The extension amount (extension amount) of the front wall 31c in the sheet width direction is shorter than the extension amount of the rear wall 31b. In other words, the rear wall 31b extends so as to be positioned closer to the center of the frame than the front wall 31c.

  Further, most of the front wall 31c extends along the front wall 22c of the first side frame piece upper part 22 and extends slightly inward from the front wall 22c of the first side frame piece upper part 22 in the seat width direction. ing.

  Moreover, as shown in FIG. 4, the front wall 31c is provided with a front flange portion 31f for reinforcement. The front flange portion 31f is a flange portion provided on the second side frame piece 30 (one side frame piece), and an end portion (extension direction front end portion) on the inner side in the seat width direction of the front wall 31c is rearward (that is, the front end portion). The side wall 31b is bent toward the side where the rear wall 31b is located.

  Here, the rear wall 31b and the front wall 31c correspond to end portions of the second side frame piece 30 in the front-rear direction (that is, the direction intersecting with the extending direction of the side frame 10 and the seat width direction). The front wall 31c corresponds to a first end located on the side closer to the occupant than the rear wall 31b in a state where the occupant is seated on the vehicle seat S. The rear wall 31b corresponds to a second end located on the side farther from the occupant than the front wall 31c when the occupant is seated on the vehicle seat S.

  As shown in FIGS. 2 and 3, the second side frame piece upper part 32 is continuous with the second side frame piece lower part 31, and extends upward from the upper end of the second side frame piece lower part 31. The second side frame piece upper part 32 is gently curved so as to gradually go inward in the seat width direction as it goes upward. As shown in FIGS. 2 and 3, the second side frame piece upper part 32 includes a side wall 32a, a rear wall 32b, and a front wall 32c.

  The side wall 32a is continuous with the side wall 31a of the second side frame piece lower portion 31, and is curved in an arc shape so as to go inward in the seat width direction as it goes upward. Further, a reinforcing bead 32h is formed at the center portion in the front-rear direction of the side wall 32a as shown in FIG. This reinforcing bead 32h is formed by raising the side wall 32a outward in the sheet width direction, and is formed from the upper end to the lower end of the side wall 32a.

  In addition, in a state where the first side frame piece upper part 22 and the second side frame piece lower part 31 are overlapped, as shown in FIG. 2, a reinforcing bead 22 h formed on the side wall 22 a of the first side frame piece upper part 22, The reinforcing beads 32h formed on the side wall 32a of the second side frame piece upper part 32 are arranged so as to be continuous.

  The rear wall 32b extends from the rear end of the side wall 32a toward the inner side in the sheet width direction, and is provided from the upper end to the lower end of the side wall 32a. The rear wall 32b is curved in an arc shape so as to go inward in the sheet width direction as it goes upward. The rear wall 32 b is continuous with the rear wall 31 b of the second side frame piece lower portion 31.

  The front wall 32c extends from the front end of the side wall 32a toward the inner side in the sheet width direction, and is provided from the upper end to the lower end of the side wall 32a. The front wall 32c is curved in an arc shape so as to go inward in the seat width direction as it goes upward. The front wall 32 c is continuous with the front wall 31 c of the second side frame piece lower portion 31. Moreover, the lower end part of the front wall 32c is comprised so that it may become narrow as it goes below, as shown in FIG.

  The connection frame 50 according to the present embodiment is formed of a metal plate bent a plurality of times in the front-rear direction and the vertical direction, and extends along the sheet width direction. Both ends of the connecting frame 50 in the seat width direction are welded to the second side frame piece upper part 32, respectively.

  More specifically, as shown in FIG. 5, the end of the connecting frame 50 enters the space surrounded by the upper ends of the side wall 32a, the rear wall 32b, and the front wall 32c in the second side frame piece upper part 32. Yes. The end of the connecting frame 50 that has entered the space is welded to each of the side wall 32a, the rear wall 32b, and the front wall 32c (strictly, laser welding), so that the connecting frame 50 becomes the second side frame. The upper part 32 is joined.

  As described above, in the present embodiment, the connection frame 50 partially overlaps the second side frame piece 30 (corresponding to one side frame piece) in the seat width direction. In other words, the frame overlap portion 60 where the connection frame 50 and the second side frame piece 30 overlap is provided at the upper end of the seat back frame F1.

  In the frame overlap portion 60, as shown in FIG. 5, the connecting frame 50 and the second side frame piece 30 overlap with each other in a state where the cross section X2 (cross section intersecting with the extending direction of the side frame 10) forms a closed cross section. . Here, as shown in FIG. 5, “a state in which a closed cross section is formed” refers to a closed cross section surrounded by the connection frame 50 and the second side frame piece upper part 32 of the second side frame piece 30. Means the state.

  Further, the reinforcing bead 32h formed on the side wall 32a of the second side frame piece upper part 32 is a range in which the frame overlapping portion 60 is provided in the extending direction of the side frame 10, as shown in FIGS. Has reached.

<< Details of overlapping parts >>
A portion where the first side frame piece upper portion 22 and the second side frame piece lower portion 31 overlap, that is, the overlapping portion 40 will be described in detail with reference to FIG.

  In the overlapping portion 40, the first side frame piece upper portion 22 and the second side frame piece lower portion are formed in a state where a plurality of closed regions are formed in the cross section X1 (strictly, the cross section intersecting the extending direction of the side frame 10). Both 31 overlap. Here, the “closed region” is a region enclosed by both the first side frame piece upper part 22 and the second side frame piece lower part 31 and closed.

  In the cross section X1, there are a first closed region 41 and a second closed region 42 that are aligned in the front-rear direction (the direction intersecting each of the extending direction of the side frame 10 and the seat width direction). In this way, by forming a plurality of closed regions in the cross section X1 of the overlapping portion 40, it is possible to effectively increase the cross section coefficient of the overlapping portion 40. Thereby, in the vehicle seat S, the rigidity of the overlapping portion 40 is effectively enhanced.

  The two closed regions are formed so that the area occupied in the cross section X1 (that is, the area surrounded by each closed region) is different from each other. More specifically, as shown in FIG. 4, the width of the second closed region 42 is larger than the width of the first closed region 41. With such a configuration, it is possible to preferentially increase the rigidity of the portion (specifically, the front portion) on the side where the first closed region 41 is located in the overlapping portion 40. However, it is not limited to this, and the width of the first closed region 41 may be larger than the width of the second closed region 42. Further, the width of the second closed region 42 and the width of the first closed region 41 may be equal.

  Explaining each closed region, the first closed region 41 is a closed region formed further forward as shown in FIG. The first closed region 41 is surrounded by the front end portion and the front wall 22c of the side wall 22a of the first side frame piece upper part 22 and the side wall 31a of the second side frame piece lower part 31, and is a flat closed long in the front-rear direction. It is an area.

  As shown in FIG. 4, the second closed region 42 is a closed region formed further rearward. The second closed region 42 is configured by a corner portion 22d formed by the side wall 22a and the rear wall 22b of the first side frame piece upper portion 22, and a bent portion 31d formed by the rear wall 31b of the second side frame piece lower portion 31. It is a substantially square closed region.

  As shown in FIG. 4, the bent portion 31 d is located outside the inner end (the portion located closest to the center of the frame) of the front wall 31 c of the second side frame piece lower portion 31 in the seat width direction. ing. If it demonstrates easily with reference to FIG. 4, the bending part 31d will be located outside the inner side end of the front wall 31c by the distance w illustrated in FIG. 4 in the sheet width direction. Thus, in the present embodiment, the bent portion 31d is provided in the second side frame piece lower portion 31 so as to be close to the outside in the seat width direction. With such a configuration, it is possible to suppress the occupant from feeling cramped (specifically, the feeling that the space that can enter between the side frames 10 is narrowed by the formation of the bent portion 31d) when the seat is seated. It becomes possible.

  Further, as shown in FIG. 4, the side wall 22 a of the first side frame piece upper portion 22 is placed on the inner side in the seat width direction (the second side frame piece lower portion 31 is located at a portion located between the closed regions 41 and 42 in the cross section X 1. A reinforcing bead 22h is arranged so as to be raised toward the side where it is positioned. In the present embodiment, the reinforcing bead 22h is disposed at a substantially intermediate position between the first closed region 41 and the second closed region 42 in the front-rear direction. However, the position of the reinforcing bead 22h is not particularly limited, and may be a position closer to the first closed region 41 or a position closer to the second closed region 42.

<< Other Embodiments >>
Embodiment described above is for making an understanding of this invention easy, and does not limit this invention. That is, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes its equivalents.

  In the above embodiment, the side frame 10 of the seat back frame F1 is divided into two upper and lower side frame pieces (the first side frame piece 20 and the second side frame piece 30), and the side frame pieces are partially separated from each other. The overlapping configuration has been described. However, the present invention is not limited to this, and in the present invention, as shown in FIG. 6, the side frame 110 of the seat cushion frame F2 has two side frame pieces (first side frame piece 120 and second side frame piece 130). It is also applicable to a configuration in which the side frame pieces partially overlap each other. That is, in the side frame 110 of the seat cushion frame F2, in the cross section of the overlapping portion where the side frame pieces overlap each other (the cross section with the front-rear direction as the normal direction), there are a plurality of closed regions as in the configuration illustrated in FIG. If formed, it is possible to sufficiently ensure the rigidity of the overlapping portion.

10 side frame 20 first side frame piece 21 first side frame piece lower part 21a side wall 21b rear wall 21c front wall 22 first side frame piece upper part 22a side wall 22b rear wall (second end)
22c Front wall (first end)
22d Corner 22h Reinforcement bead (raised area)
30 Second side frame piece 31 Second side frame piece lower part 31a Side wall 31b Rear wall (second end)
31c Front wall (first end)
31d Bent part 31e Rear flange part 31f Front flange part (flange part)
32 Second side frame piece upper part 32a Side wall 32b Rear wall 32c Front wall 32h Reinforcement bead 40 Overlapping portion 41 First closed region 42 Second closed region 50 Connection frame 60 Frame overlapping portion 110 Side frame 120 First side frame piece 130 Second Side frame piece F1 Seat back frame (frame)
F2 seat cushion frame (frame)
S Vehicle seat (vehicle seat)
S1 Seat back S2 Seat cushion S3 Headrest T1 First closed region T2 Second closed region X1 Cross section X2 Cross section

Claims (8)

A vehicle seat with a frame inside,
The side frame located at the side end of the frame extends in a predetermined direction, and has a first side frame piece and a second side frame piece partially overlapping in the extending direction of the side frame,
In the overlapping portion where both the first side frame piece and the second side frame piece overlap in the side frame, a closed region surrounded by the both in the cross section of the overlapping portion intersecting the extending direction is closed. A vehicle seat characterized in that a plurality of the two overlap each other in a state of being formed.   2. The vehicle seat according to claim 1, wherein the plurality of closed regions are arranged in a direction intersecting each of the extending direction and the width direction of the vehicle seat in the cross section.   3. The vehicle seat according to claim 1, wherein the plurality of closed regions have a first closed region and a second closed region that are different from each other in the cross section. The second side frame piece overlaps the first side frame piece in a state of being arranged closer to the center of the frame than the first side frame piece in the width direction of the vehicle seat,
2. A raised region in which the first side frame piece is raised toward the center of the frame in the width direction is provided at a portion located between the closed regions in the cross section. The vehicle seat according to any one of claims 1 to 3.   One of the plurality of closed regions is a bending formed by bending the first side frame piece so as to form a corner of the second side frame piece in the cross section and a diagonal of the corner. The vehicle seat according to any one of claims 1 to 4, wherein the vehicle seat is constituted by a portion. The first side frame piece has a first end and a second end in a direction intersecting each of the extending direction and the width direction of the vehicle seat,
The first end portion extends toward the center of the frame in the width direction, and is positioned closer to the occupant than the second end when the occupant is seated on the vehicle seat,
6. The vehicle seat according to claim 5, wherein the bent portion is located outside a portion of the first end portion located closest to a center of the frame in the width direction. . The frame includes a pair of side frames that are separated from each other in the width direction of the vehicle seat, and a connection frame that connects the side frames in the width direction,
The connecting frame partially overlaps one side frame piece in the width direction of the first side frame piece and the second side frame piece of the side frame,
In a frame overlapping portion where the connecting frame and the one side frame piece overlap each other, a cross section of the frame overlapping portion intersecting the extending direction is closed by being surrounded by the connecting frame and the one side frame piece. The vehicle seat according to any one of claims 1 to 6, wherein the connecting frame and the one side frame piece overlap with each other in a state of being formed. The first side frame piece and the second side frame piece have a first end and a second end in a direction intersecting each of the extending direction and the width direction of the vehicle seat,
In a state where an occupant is seated on the vehicle seat, the first end is located closer to the occupant than the second end,
Of the first side frame piece and the second side frame piece, the first end portion of one side frame piece is formed by bending toward the side where the second end portion is located. The vehicle seat according to any one of claims 1 to 7, wherein a flange portion is provided.

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