JP2016169009A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which achieves weight reduction of a member configured to support a lumber part of an occupant while securing a range of the member, which can support the lumber part, and enables improvement of rigidity of an attachment part of the member.SOLUTION: A vehicle seat includes: a seat back frame 1 having a pair of side frames 11, 12, an upper frame 13 connecting the pair of side frames 11, 12 at an upper side, and a connection member 40 connecting the pair of side frames 11, 12 at a lower side; and a frame member 44 disposed at a substantially center position of the connection member 40. The connection member 40 has: a horizontal part positioned in a center part and extending in a horizontal direction; and left and right bending parts which are bent from left and right end parts of the horizontal part. The frame member 44 is formed into a frame shape by bending a linear member and is joined to the horizontal part of the connection member 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat that includes a member that absorbs energy of rearward movement of an occupant during a rear-end collision and that is reduced in weight.

  When the rear part of a vehicle such as an automobile is bumped into the rear or a large collision occurs during reverse travel, the seated occupant suddenly moves backward due to inertial movement, causing the seat back back surface May be pressed against.

  As a technique for improving the safety by sinking the occupant backward in accordance with such a rapid rearward movement of the occupant, for example, a technique of Patent Document 1 is known. Patent Document 1 proposes a technique in which a pelvis support member that absorbs energy of backward movement of an occupant due to inertial force at the time of a rear collision is attached near the lower portion of the seat back.

  This pelvic support member can sink the occupant in the seatback and absorb the impact energy caused by the occupant's rearward movement without disturbing the occupant's rearward movement when a large impact force greater than a predetermined value is applied. it can.

JP 2004-209017 A

  The vehicle seat described in Patent Document 1 holds the waist from the occupant's buttocks deep in the seat back at the time of a rear collision by a pelvic support member installed on a torsion bar elastically attached to the seat back frame. It has improved shock absorption capability. The pelvis support member is a vehicle seat that is disposed as a plate-like member in the left-right direction at a position below the seat back frame, and supports the vicinity of the occupant's waist by the surface of the plate-like member. It is.

  However, in Patent Document 1, since the pelvis support member disposed to absorb the impact energy due to the rearward movement of the occupant is formed of a plate-like member, the weight of the entire vehicle seat increases. There was a problem.

  In addition, the attachment mechanism of the torsion bar and the link member for installing the pelvis support member on the vehicle seat is complicated, and since it includes a plurality of members, the weight further increases and the portion to which the pelvis support member is attached There was a problem that rigidity was impaired.

  An object of the present invention is to provide a vehicle seat provided with a frame-like member as an energy absorbing member that absorbs the energy of rearward movement of the occupant during a rear-end collision, while securing a range in which the occupant's waist can be supported, while the frame-like member Is to provide a vehicle seat in which the rigidity of the attachment portion of the frame-shaped member is improved.

  According to the vehicle seat of claim 1, the subject includes: a pair of side frames; an upper frame that connects the pair of side frames at the top; and a connecting member that connects the pair of side frames at the bottom. A seat-back frame having a frame-like member disposed at a substantially central position of the connecting member, the connecting member being positioned in the center and extending horizontally, and the horizontal portion Left and right bent portions bent from both left and right end portions, and the frame-shaped member is formed into a frame shape by bending a linear member, and is joined to the horizontal portion of the connecting member, Solved.

Thus, in the vehicle seat of the present invention, the frame-shaped member that absorbs the movement of the occupant when moving backward is joined to the connecting member provided at the lower position of the seat back frame. The shaped member is bent to form a frame shape and joined so as to be integrated with the horizontal portion of the connecting member. With such a configuration, the strength of the frame-shaped member can be maintained, and the range (area) in which the occupant's waist can be supported is increased, so that a sufficient area for supporting the occupant's waist can be secured. Moreover, by forming in a frame shape, the weight can be reduced compared to a member formed in a plate shape, and by forming the frame member by a linear member, a further reduction in weight can be achieved.

At this time, the joint portion of the connecting member with the pair of side frames can be configured to be disposed at positions having different heights on the left and right, or disposed at substantially the same positions on the left and right. Can be configured.
In addition, it is preferable that the horizontal portion is disposed at a position lower than a joint portion between the connecting member and the pair of side frames.
Further, it is preferable that a plate-like member is joined to the connecting member, and the plate-like member and the frame-like member are disposed so as to overlap in a front view.

The frame-shaped member is formed in a substantially U-shape having an opening portion where at least a part of one side is not continuous, the opening portion faces the connecting member side, and is joined to the connecting member. It is preferable that the joint portion of the member bends inward in the sheet width direction.
At this time, it is preferable that the thickness of the connecting member is larger than the thickness of the frame-shaped member.
Further, it is preferable that a plate-like member is joined to the connecting member, and at least a part of the plate-like member is disposed in the frame of the frame-like member.
And a reclining device provided below the pair of side frames, wherein a height of a central axis of the reclining device is different from a height of a joint portion of the connecting member with the pair of side frames. To do.

  According to the vehicle seat of the present invention, by providing the frame-shaped member, the movement of the occupant's lower back is absorbed, and an area for supporting the lower back is secured, and the vehicle seat is reduced in weight. be able to. Moreover, since the frame-shaped member is formed of a linear member, a vehicle seat that is further reduced in weight can be provided.

It is a schematic perspective view of the sheet | seat which concerns on one Embodiment of this invention. 1 is a schematic perspective view of a seat frame according to an embodiment of the present invention. 1 is a schematic front view of a seat frame according to an embodiment of the present invention. 1 is a schematic rear view of a seat frame according to an embodiment of the present invention. It is expansion explanatory drawing which shows the structure of the member pipe which concerns on one Embodiment of this invention, and an energy absorption member. It is a front view of the pipe reinforcement member concerning one embodiment of the present invention. It is a side view which shows the relationship between the pipe reinforcement member which concerns on one Embodiment of this invention, and a member pipe. It is explanatory drawing of the seating side side frame which concerns on one Embodiment of this invention. It is expansion explanatory drawing which shows the structure of the member pipe which concerns on another example, and an energy absorption member. It is explanatory drawing of the seating side side frame which concerns on other embodiment of this invention. It is explanatory drawing which shows the relationship between the seat back frame and back cover which concern on other embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and various modifications can be made in accordance with the spirit of the present invention. In this specification, a vehicle refers to a vehicle for traveling on which a seat can be mounted, such as a vehicle for traveling on the ground such as an automobile or a railroad, an aircraft or a ship that moves outside the ground.

  1 to 8 show an embodiment of the present invention. FIG. 1 is a schematic perspective view of a seat, FIG. 2 is a schematic perspective view of a seat frame, FIG. 3 is a schematic front view of the seat frame, and FIG. 5 is a schematic rear view of the frame, FIG. 5 is an enlarged explanatory view showing the configuration of the member pipe and the energy absorbing member, FIG. 6 is a front view of the pipe reinforcing member, and FIG. 7 is a side view showing the relationship between the pipe reinforcing member and the member pipe. FIG. 8 is an explanatory diagram of the seating side frame. In the following description, the left-right direction means the left-right direction in a state of facing the front of the vehicle body. Moreover, although the structure provided with the three-point seatbelt apparatus is shown in this embodiment, it is good also as a vehicle seat which is not provided with a three-point seatbelt.

  As shown in FIG. 1, the vehicle seat S according to the present embodiment includes a seat back S <b> 1, a seating portion S <b> 2 and a headrest S <b> 3. 2a is placed and covered with skin materials 1b and 2b. The headrest S3 is formed by disposing a pad material 3a on a core material 3 (see FIG. 2) and covering it with a skin material 3b. The core material 3 of the present embodiment also serves as a headrest pillar that supports the headrest S3, but the core material and the headrest pillar may be configured separately.

  The vehicle seat S of the present embodiment is a passenger seat, the left side (right side in FIG. 1) of the vehicle seat S is the vehicle body outside (vehicle door side), and the right side of the vehicle seat S (toward FIG. 1). The left side is the inside of the car (the car's center). The vehicle seat S is a vehicle seat integrated with a seat belt to which a seat belt B is attached, and a shoulder belt portion B1 of the seat belt B is attached to the outside of the vehicle body at the upper part of the seat back S1.

  As shown in FIGS. 2 to 4, the seat frame F of the vehicle seat S includes a seat back frame 1 constituting the seat back S1 and a seating frame 2 constituting the seating portion S2. Further, the seat back frame 1 and the seating frame 2 are connected to each other via a reclining device 15 so as to be rotatable.

  The seat back S1 has the cushion pad 1a mounted on the seat back frame 1 as described above and is covered with the skin material 1b from above the cushion pad 1a, and supports the back of the occupant from the rear. . In the present embodiment, the seat back frame 1 is a substantially rectangular frame formed of a metal plate or pipe.

A pair of side frames 11 and 12 provided in the seat back frame 1 extending in the up-down direction are spaced apart from each other in the left-right direction in order to form a seat back width.
That is, the side frames 11 and 12 constituting a part of the seat back frame 1 are configured to have a predetermined length in the vertical direction, and are disposed to face each other with a predetermined interval in the horizontal direction. In the seat back frame 1 (between the side frames 11 and 12 on both sides), an erection member 61 as a posture holding member that supports the cushion pad 1a from the rear is disposed in an inner region of the seat back frame 1. .

  Both ends of the erection member 61 are pivotally supported by the side frame reinforcing member 30 or the side frame 11 and a pivotal support portion provided on the side frame 12. This pivotal support is only required to pivotally support the erection member 61, and a known technique can be used. A hole is formed in the side plate of the side frame reinforcing member 30 or the side frame 11 and the side frame 12 instead of the shaft support portion, and the end portion of the erection member 61 is rotatably inserted into the hole to prevent it from coming off. May be applied.

  In the present embodiment, an S spring formed from a steel wire having a spring property is used as the erection member 61 disposed between the side frames 11 and 12. The erection member 61 is not limited to the S spring, and any member may be provided as long as it can support the occupant from the rear, such as a plate-like member. In addition, of course, it is good also as a structure provided with the mat | matte and lumbar support function.

  Of the side frames 11 and 12, the side frame 11 disposed outside the vehicle body (vehicle door side) is a closed cross-sectional structure formed by bending a single metal plate into a rectangle, that is, the cross-sectional shape is a hollow rectangular shape. (Closed section structure portion 11a). An extension portion 11b formed by extending a flat plate material downward is formed below the surface of the side frame 11 on the outer side (vehicle door side) of the closed section structure portion 11a. It is formed integrally with the outer surface. That is, after the plate material is punched out so that a portion extending to the central portion on one side of the plate material is formed, the sheet metal is processed so that the cross section becomes a hollow rectangular shape. A plurality of holes 11c are formed on the outer surface of the closed cross-section structure portion 11a.

The side frame 12 disposed inside the vehicle body (on the vehicle body center side) is formed by bending both ends in the vehicle front-rear direction of a single metal plate material to the inside of the seat frame F.
Thus, the side frame 11 disposed on the outer side of the vehicle body has a closed cross-sectional structure, and is formed to have a higher strength than the side frame 12 provided on the inner side of the vehicle body. In the vehicle seat S integrated with the seat belt, a large load is applied from the occupant to the seat belt B due to a vehicle collision or the like, and a large load is applied to the side frame 11 outside the vehicle body to which the shoulder belt portion B1 is attached. The structure is such that the rigidity of the side frame 11 outside the vehicle body is increased.

  A side frame reinforcing member 30 is fixed to the seat inner side of the extension portion 11b extending below the closed cross-section structure portion 11a of the side frame 11, that is, the side on which the occupant of the side frame 11 sits. The side frame reinforcing member 30 is formed by bending a single plate body so that the cross section has a substantially U-shaped cross section, and setting the width in the left-right direction to be slightly narrower than the width in the left-right direction of the seat of the closed cross-section structure portion 11a. The width in the front-rear direction is approximately the same as the width in the front-rear direction of the sheet.

  The side frame reinforcing member 30 is joined by welding or the like so that the front and rear surfaces when arranged on the seat inner side of the extension portion 11b and the extension portion 11b are substantially continuous. Further, the upper portion of the side frame reinforcing member 30 facing the seat inner side is arranged to overlap with the lower portion of the seat inner surface of the closed cross-section structure portion 11a of the side frame 11 by a predetermined width, and is joined by welding or the like so as to be continuous. Has been. Thus, the side frame reinforcing member 30 is attached so as to be substantially integrated with the side frame 11. Since the side frame 11 on the side where the shoulder belt portion B1 is attached has a closed cross-sectional structure, and an integrally formed extension portion 11b is provided and the side frame reinforcing member 30 is fixed inside thereof, the reclining device 15 and the shoulder belt portion B1 The rigidity of the side frame 11 can be improved while suppressing a decrease in the dimensional accuracy of the attachment position.

  As shown in FIGS. 2 to 4, the upper frame 13 is formed by bending a pipe material, and the side surface portion 13 a of the upper frame 13 is disposed so as to partially overlap the side plate of the side frame 12. The overlapping portion is joined to the side frame 12 by welding or the like. On the other hand, the other end of the upper frame 13 is joined to a recess formed at the upper end of the side frame 11.

  A headrest S3 is disposed above the upper frame 13 constituting the seat back frame 1. As described above, the headrest S3 is configured such that the pad material 3a is provided on the outer periphery of the core material 3 and the outer surface of the pad material 3a is covered with the skin material 3b. A guide lock is attached below the core member 3 (portion corresponding to the headrest pillar) attached to the upper frame 13 so that the height position can be adjusted.

And the shoulder anchor part 14 for making the seatbelt B penetrate is fixedly joined on the upper frame 13 by the side frame 11 side which was reinforced. The shoulder anchor portion 14 is a box-shaped member surrounded by the front side surface, the left and right side surfaces, the top surface, and the back surface, and the front side surface has a substantially inverted U shape when viewed from the front, and a space is formed in the center portion. Has the shape. Lower end portions of the left and right sides of the shoulder anchor portion 14 are joined to the upper frame 13 by welding or the like, and a space is formed between the upper frame 13 and the back surface of the shoulder anchor portion 14. The shoulder belt portion B1 is inserted from below the space between the upper frame 13 and the shoulder anchor portion 14, and is further inserted through the space formed in the center portion of the front surface to be inserted to the front side.
The shoulder anchor portion 14 is disposed at substantially the same position as the side frame 11 located on the outer side of the vehicle body (vehicle body door side) or on the outer side of the side frame 11.

  Below the seat back frame 1 (on the seating frame 2 side), the side frames 11 and 12 are connected by a member pipe 40 as a connecting member. The member pipe 40 is disposed in the left-right direction along the rotation axis direction of the reclining device 15, and one end thereof is joined to the side frame reinforcing member 30 fixed integrally with the side frame 11 below the side frame 11. The side frame 11 is connected to the side frame 11 via the side frame reinforcing member 30, and the other end is joined to the lower side of the side frame 12 by welding or the like.

  The member pipe 40 is bent in a concavo-convex shape as long as it does not interfere with the seating frame 2. In the present embodiment, when the occupant's lower back part sinks to the seat back S1 side, the substantially central portion of the member pipe 40 is bent downward and has a recess so as not to hinder the rearward movement of the occupant. It has become. As shown in FIG. 2, pipe reinforcing members 42 and 43 are joined to the concave portion.

  A plurality of the erection members 61 may be provided, one of which is locked above the end portion 40a of the member pipe 40 joined to the side frame reinforcement member 30, and the side frame reinforcement member 30 is flat. It is locked below the position joined to the lower part of the sheet inner surface of the cross-sectional structure part 11a (see FIG. 5). With such a configuration, workability is improved when the installation member 61 is attached. Furthermore, the space between the joint part of the side frame reinforcing member 30 and the flat cross-section structure part 11a and the end part 40a of the member pipe 40 can be effectively utilized.

  Since the member pipe 40 is bent so that the position corresponding to the waist of the occupant is positioned below the occupant's waist, the member pipe 40 is not held down by the member pipe 40 when moving backward. Accordingly, the upper body of the occupant can be sunk into the seat back S1 and the member pipe 40 can be sunk below the occupant without suppressing backward movement. In addition, the member pipe 40 is provided with the pipe reinforcing members 42 and 43, whereby the rigidity of the member pipe 40 can be improved.

  The seating part S2 mounts the cushion pad 2a on the seating frame 2 as described above, is covered with the skin material 2b from above the cushion pad 2a, and supports the occupant's buttocks from below. In the present embodiment, as shown in FIG. 2, the seating frame 2 includes seating side frames 121 and 123, a seating rear frame 28, and seating front frames 29a and 29b. .

  The seating side frame 121 includes an upper seating side frame 21 and a lower seating side frame 22. In addition, the seating side frame 123 includes an upper seating side frame 23 and a lower seating side frame 24. The upper seating side frames 21 and 23 are rotatably connected to the extension 11b of the side frame 11 and the side frame 12 via the reclining device 15, respectively.

  The upper seating side frames 21 and 23 are connected to the side frames 11 and 12, respectively. The upper seating side frame 21 of the seating side frame 121 disposed outside the vehicle body is rotatably connected to the extension 11 b of the side frame 11 via the reclining device 15. The upper seating side frame 23 of the other seating side frame 123 is rotatably connected to the side frame 12 via a support shaft.

  The upper seating side frames 21 and 23 are formed so as to be continuous with the lower seating side frames 22 and 24 at the connecting portions with the lower seating side frames 22 and 24, respectively. It is attached so as to cover the upper end of 24.

  The lower seat side frames 22 and 24 are spaced apart from each other in the left-right direction to form a seating width, and are formed to extend in the front-rear direction. As shown in FIG. 4, both ends of the retractor mounting bracket 50 made of a plate material connecting the rear sides of the lower seating side frames 22 and 24 are joined to the lower seating side frames 22 and 24, respectively.

  The lower seating side frames 22 and 24 are formed of a metal plate, and the rear side thereof is formed to extend upward, that is, to the seat back frame 1 side. Smooth grooves (beads) are formed on the surfaces of the lower seating side frames 22 and 24 corresponding to the shape of the lower seating side frames 22 and 24. The lower seating side frames 22 and 24 are joined to the above-described upper seating side frames 21 and 23, and the upper seating side frames 21 and 23 are joined to the side frames 11 and 12, respectively, to form the seat frame F. Is forming.

  The lower seating side frames 22 and 24 are supported below, and upper rails 25 and 25 are attached to the lower seating side frames 22 and 24, respectively. And the upper rails 25 and 25 are assembled in the slide type which can adjust a position back and forth between the lower rails 26 and 26 installed in a vehicle body floor.

  As shown in FIGS. 3 and 4, a plurality of grooves (beads) are formed on the surface of the retractor mounting bracket 50, and a retractor 54 as a seat device unit is joined to the front surface thereof. The retractor 54 has a configuration in which the seat belt B is pulled out or rewinded. In the present embodiment including the three-point seat belt, the retractor 54 is located on the front surface side of the retractor mounting bracket 50 and on one side. It is attached in the vicinity of the frame 11 side at a position that does not contact a seating side rear frame 28 described later. FIG. 3 shows a state in which the cushion support member 27 is partially cut away to illustrate the retractor 54.

  Further, a pipe-like seating-side rear frame 28 is attached to the front side of the retractor mounting bracket 50, and seating-side front frames 29a and 29b are connected to the lower seating-side side frames 22 and 24, respectively. Yes. Further, a lower connecting member 51 is disposed in front of and below the retractor mounting bracket 50 so as to connect the lower seating side frames 22 and 24. The retractor mounting bracket 50, the seating side rear frame 28, the seating side front frames 29a and 29b, and the lower connecting member 51 are made of a metal plate material and a pipe material, and the respective end portions are formed on the lower seating side side frames 22 and 24. It is firmly joined by welding or the like.

  A cushion support member 27 that supports the cushion pad 2a from below is disposed in an inner region of the seating frame 2 in the seating frame 2 (between the seating side frames 121 and 123 on both sides). The cushion support member 27 is made of a substantially rectangular plate, and is fixed by a pair of opposing front and rear sides being laid on the seating side rear frame 28 and the seating side front frames 29a and 29b, respectively.

  The cushion support member 27 is made of a metal plate material, and smooth unevenness is formed on the plate material. In the present embodiment, an example in which a plate material is disposed as the cushion support member 27 is shown, but the shape and material are not limited to this as long as the structure can support the occupant and the cushion pad 2a from below.

(About member pipe 40)
In the present embodiment, as shown in FIG. 2, a member pipe 40 is provided below the seat back frame 1, that is, in a portion corresponding to the waist of the occupant.

The member pipe 40 is formed of a metal wire or pipe, and the end portions 40a and 40b are joined to the side frame reinforcing member 30 and the side frame 12 by welding as shown in FIG. The side frame auxiliary member 30 is formed integrally with the side frame 11, and the end portion 40 a is connected to the side frame 11 via the side frame auxiliary member 30. Therefore, the side frames 11 and 12 are connected downward by the member pipe 40.
In the present embodiment, an example in which the side frame auxiliary member 30 is attached to the side frame 11 has been described. However, the end 40a may be connected to the side frame 11 in which the side frame auxiliary member 30 is not provided. .

  And the height position where edge part 40a, 40b is joined is arrange | positioned in the position where one edge part 40a joined to the side frame 11 side in which the shoulder anchor part 14 was installed is higher than the other edge part 40b. Is done. That is, one end 40a joined to the side frame reinforcing member 30 is disposed higher than the other end 40b. The member pipe 40 is configured to be bent so that the end 40a is disposed at the highest position with respect to the mounting height.

  Thus, in the present invention, the end portion 40a of the member pipe 40 is attached at a position higher than the end portion 40b, and the attachment heights of the end portions 40a and 40b are different. And, by adopting a configuration in which the shape of the member pipe 40 is bent asymmetrically, even when excessive energy is applied to the shoulder anchor portion 14 such as at the time of a rear collision, the load is effectively dispersed, It can be absorbed.

  In addition, of the end portions 40 a and 40 b, the mounting height of the upper end portion 40 a is joined to a position below the central axis of the reclining device 15. Further, the uppermost portion of the member pipe 40 is disposed below the central axis of the reclining device 15 that rotates. By setting it as this structure, a passenger | crew waist part can be sunk to the seat back S1 side, without suppressing back movement of a passenger | crew waist part.

  The member pipe 40 has a substantially central portion bent as described above, that is, a central portion 40g disposed below, and the member pipe 40 is bent and formed in a concave shape. More specifically, the member pipe 40 includes bent portions 40c, 40d, 40e, and 40f between the end portions 40a and 40b, and a flat central portion is provided at a substantially central position, that is, at a portion corresponding to the occupant's waist. 40 g is formed. The bent portions 40c and 40d closer to the end portions 40a and 40b are bent downward, and the respective end portions 40a and 40b are higher than the bent portions 40c and 40d, or substantially the same height position. It is the structure arrange | positioned by.

  In addition, in this embodiment, although the structure was shown with the member pipe 40 being one, it is good also as a structure which arranged two or more up and down. At this time, the upper surface of the member pipe 40 disposed on the uppermost side is configured to be disposed below the occupant's waist, thereby preventing the occupant from moving backward. Further, the member pipe 40 does not necessarily include the bent portions 40c, 40d, 40e, and 40f that are bent substantially vertically, as long as the central portion 40g is disposed at least below the waist of the occupant. Alternatively, a straight member pipe 40 may be used.

  More specifically, the upper surface of the member pipe 40 is preferably disposed below the occupant's fifth lumbar vertebra. With such a configuration, the member pipe 40 is disposed below the sacrum of the occupant. Therefore, when moving backward, the member pipe 40 can be submerged under the occupant due to the inclination of the sacrum. .

  Further, the member pipe 40 is provided with pipe reinforcing members 42 and 43 for reinforcing the bent portions 40e and 40f. The pipe reinforcing members 42 and 43 are joined so as to straddle the inner side (the smaller angle side) of the bent portions 40e and 40f, and are firmly joined by the reinforcing member joining portions 42a, 42b, 43a, and 43b. . By providing the pipe reinforcing members 42 and 43, the load applied to the bent portions 40e and 40f can be received, and the rigidity of the member pipe 40 can be improved.

  The pipe reinforcement members 42 and 43 are disposed at positions below the center axis of the reclining device 15 that rotates. More specifically, the uppermost ends of the pipe reinforcing members 42 and 43 are disposed below the central axis of the reclining device 15. By setting it as such a structure, it does not hit a passenger | crew's waist | hip | lumbar part and does not suppress a passenger | crew's back movement.

  As shown in FIG. 5, since the bending portions 40c, 40d, 40e, and 40f of the member pipe 40 are different from each other, the pipe reinforcing members 42 and 43 are formed in different shapes. Hereinafter, the pipe reinforcing member 43 will be described in detail with reference to FIG. In addition, although the shape of the installation part 42c is a little different regarding the pipe reinforcement member 42 used as a pair, since it is the substantially same structure, description is abbreviate | omitted.

  As shown in FIG. 6, the pipe reinforcing member 43 is formed of a flat plate material, and has a construction portion 43 c formed in an asymmetrical arch shape in accordance with the shapes of the bent portions 40 d and 40 f of the member pipe 40. I have. The erection part 43 c is a plane plate shape that is asymmetrical to the left and right, and is formed so as to straddle the bent part 40 f of the member pipe 40.

  And from the member pipe 40 side of the installation part 43c, the leg parts 43d and 43e for contact | abutting to the member pipe 40 are extended. The leg parts 43d and 43e are bent substantially perpendicularly from the installation part 43c, and the leg parts 43d and 43e are bent to the same surface side with respect to the surface of the installation part 43c.

  Convex portions 43f and 43g are formed between the erection portion 43c and the leg portions 43d and 43e, respectively. More specifically, the beads 43f and 43g are formed between the erection portion 43c and the leg portions 43d and 43e so as to straddle the portion bent substantially vertically. Thus, the strength of the pipe reinforcing member 43 can be increased by providing the bead.

  Further, the installation portion 43c is provided with a plurality of holes 43i, and the pipe reinforcing member 43 can be made lighter by adopting a structure in which holes are formed in the plate material in this way.

  Since the member pipe 40 is a cylindrical wire or pipe, the reinforcing member joint 43b is joined to the upper surface of the member pipe 40 with the legs 43e in contact with each other as shown in FIG. The At this time, it is preferable that the leg portion 43e (reinforcing member joint portion 43b) is disposed behind the cross-sectional center line of the member pipe 40 (A line in FIG. 7). With such an attachment position, a back cover 62, which will be described later, can be easily joined to the installation portion 43c, and the attachment strength can be improved.

  Thus, the reinforcing member joint portion 43b is configured to be provided on the side surface on the rear side of the member pipe 40, and a bent portion between the erection portion 43c and the leg portion 43e is arranged behind the seat back frame 1. This is preferable because the pipe reinforcing member 43 does not impede the movement of the occupant's waist when the occupant sinks.

(About the energy absorbing member 44)
As shown in FIG. 2, an EA wire as an energy absorbing member 44 is provided below the seat back frame 1, that is, at a portion corresponding to the waist of the occupant. The energy absorbing member 44 is joined to a member pipe 40 disposed below the seat back frame 1.

  As shown in FIG. 5, the energy absorbing member 44 is formed of a metal wire (bar) or pipe, and both ends thereof are bent and joined to the member pipe 40. The vicinity of both ends of the energy absorbing member 44 is bent inward along the surface of the member pipe 40 to form joints 44a and 44b. Pipe reinforcing members 42 and 43 are joined in the vicinity of the joints 44a and 44b.

At this time, it is preferable that the vicinity of both ends of the energy absorbing member 44 is joined to the leg portion (not shown) of the pipe reinforcing member 42 and the leg portions 43d and 43e of the pipe reinforcing member 43 and to the member pipe 40. .
With this configuration, the energy absorbing member 44 can be firmly attached to the member pipe 40.

  Then, the energy absorbing member 44 formed of a flexible wire is bent backward when the waist portion of the occupant moves backward with the joint portions 44a and 44b firmly joined as fulcrums (or support shafts). To absorb the energy.

  The energy absorbing member 44 is disposed on the member pipe 40 and is attached in front of the pipe reinforcing members 42 and 43 of the member pipe 40. More specifically, the joining portions 44 a and 44 b of the energy absorbing member 44 are provided in front of the reinforcing member joining portions 42 b and 43 b of the pipe reinforcing members 42 and 43 disposed on the member pipe 40.

  The energy absorbing member 44 is attached to a central portion 40g in the vicinity of the substantially center of the member pipe 40, in which the member pipe 40 is formed in a substantially linear shape. And the EA wire which comprises the energy absorption member 44 is bent by the substantially rectangular shape, and is joined along the upper surface of the center part 40g in the substantially linear part of the center part 40g of the member pipe 40. FIG. Thus, the EA wire bent into a substantially rectangular shape is extended upward, whereby the energy absorbing member 44 of the present embodiment is configured to form a substantially rectangular frame.

  By disposing the energy absorbing member 44 so as to be positioned above the member pipe 40, the energy absorbing member 44 is disposed at a position corresponding to the occupant waist. As described above, the EA wire constituting the energy absorbing member 44 is attached above the member pipe 40 to form a frame, and the frame can support the occupant's waist.

  Therefore, as compared with the case where a plate material is used as a member that absorbs energy when the upper part of the occupant moves backward, a frame body is formed by an EA wire as in this embodiment, and the energy absorbing member 44 By doing so, it is possible to reduce the weight of the vehicle seat S.

(About the seating side frames 121 and 123)
In the present embodiment, as shown in FIG. 2, the seating frame 2 includes seating-side side frames 121 and 123 that constitute the seat width, respectively, below the side frames 11 and 12. The seating side frame 121 includes a lower seating side frame 22 that extends in the front-rear direction of the vehicle, and an upper seating side frame 21 that is coupled to the rear upper part of the lower seating side frame 22. . Similarly, the seating side frame 123 includes a lower seating side frame 24 and an upper seating side frame 23.

  In the seating side frame 121 connected to the lower side of the side frame 11 on which the shoulder anchor portion 14 is disposed, the upper seating side frame 21 is connected to the side frame 11 via the reclining device 15.

  In the seating side frame 121 connected to the side frame 11 on which the shoulder anchor portion 14 is disposed, the lower seating side frame 22 is arranged on the seat inner side (occupant seating side) and the seat outer side (see FIG. 3). The vehicle door side) is provided with a plate material formed in substantially the same shape and size. That is, the lower seating side frame 22 includes a lower outer surface material 22a disposed on the outer side of the seat and a lower inner surface material 22k provided on the inner side of the seat.

  The lower outer surface material 22a and the lower inner surface material 22k are opposed to each other, their edges are bent substantially vertically, and are joined so that the bent edges overlap each other. That is, the lower outer surface material 22a and the lower inner surface material 22k are made of a plate material having a U-shaped cross section, and the edges are opposed to each other to form a hollow casing.

  At this time, the upper rear end side of the lower outer surface material 22a and the lower inner surface material 22k, that is, the portion where the upper seating side frame 21 overlaps and is connected is not joined but has an open structure. Note that it is not necessary that all the edges be bent and joined, and only a part of the edges may be joined as long as sufficient strength can be obtained. For example, it is good also as a structure which joined only the upper sides 22b and 22l which form a passenger | crew's seating surface (refer FIG. 8).

  The upper seating side frame 21 is also provided with an upper outer surface material 21a and an upper inner surface material 21k, which are plate members formed in substantially the same shape and size on the seat outer side and the seat inner side.

  Regarding the joining relationship between the upper seating side frame 21 and the lower seating side frame 22, the lower outer surface material 22a is overlapped with the lower portion of the upper outer surface material 21a at the connecting portion 21x (see FIG. 8). They are joined together by welding. More specifically, it is joined to the upper rear end side of the lower inner surface material 22k so that a part of the lower portion of the upper inner surface material 21k overlaps. The upper outer surface material 21a and the upper inner surface material 21k having substantially the same shape and the same size are opposed to each other, and the lower outer surface material 22a and the lower inner surface material 22k are sandwiched therebetween.

  At this time, the upper outer surface material 21a and the upper inner surface material 21k constituting the upper seating side frame 21 are bent substantially vertically so that the edges overlap each other, and are joined so that the edges overlap.

  In the seating side frame 121 of the present invention, as shown in FIG. 8, the connection portion 21x of the upper seating side frame 21 and the lower seating side frame 22 is improved in rigidity against the load from the shoulder anchor portion 14. For this reason, a reinforcing part (upper frame reinforcing part 21c, lower frame reinforcing part 22c, 22m) is provided. The reinforcing portion may be provided at least in the vicinity of the connecting portion 21x, more specifically, on the side where the occupant is seated, on the upper seating side frame 21 and the lower seating side frame 22, The structure provided also in the location away from 21x may be sufficient.

  The upper seating side frame 21 includes an edge 21b, that is, an upper frame bulging portion 21c as an upper frame reinforcing portion along the shape of the outer periphery. The upper frame bulging portion 21c is formed by bulging a part of the upper outer surface material 21a to the outside of the seat along the shape of the edge 21b, and avoids the mounting position of the reclining device 15 and surrounds the periphery thereof. It is formed so as to surround it.

  In the present embodiment, the upper outer surface material 21a is provided with the upper frame bulging portion 21c, but the upper inner surface material 21k is also bulged inwardly in the seat at the peripheral position of the reclining device 15. It is good also as composition provided with a part. In particular, it is preferable to provide a bulging portion above the rotation axis (center axis) of the reclining device 15 because the rigidity is further improved.

  On the other hand, the lower seating side frame 22 includes a lower frame outer surface bulging portion 22c as a lower frame reinforcing portion along the shape of the upper side 22b in the vicinity of the connecting portion 21x. The upper side 22b is smoothly curved, and a lower frame outer surface bulging portion 22c that is wide along the shape is formed by bulging a part of the lower outer surface material 22a to the outside of the seat. Regarding the lower frame outer surface bulging portion 22c, the width from the upper side 22b is not necessarily parallel to the upper side 22b, and the width may be different depending on the location as in the present embodiment.

  The upper frame bulging portion 21c and the lower frame outer surface bulging portion 22c are formed in a continuously overlapping shape. Compared with the case where the upper frame bulging portion 21c and the lower frame outer surface bulging portion 22c are formed to be separated from each other continuously, the rigidity with respect to the load applied to the connecting portion 21x is increased. Further improve.

  The lower seating side frame 22 is further provided with outer surface beads 22d and 22e at a front position on the lower outer surface material 22a. The outer surface beads 22d and 22e are formed in a shape that is long in the vertical direction by causing a part of the lower outer surface material 22a to bulge in a curved shape toward the outside of the seat. With this configuration, the rigidity of the lower seating side frame 22 is further improved.

  The lower inner surface material 22k disposed to face the lower outer surface material 22a is also provided with a lower frame inner surface bulging portion 22m as a lower frame reinforcing portion. The lower frame inner surface bulging portion 22m is formed by causing a part of the lower inner surface material 22k to bulge inside the seat along the shape of the upper side 22l of the lower inner surface material 22k.

  The lower seating side frame 22 further includes inner surface beads 22n and 22o at a front position on the lower inner surface material 22k. The inner surface beads 22n and 22o have a configuration in which a part of the lower inner surface material 22k is bulged in a curved shape toward the inner side of the seat, and is formed in a shape that is long in the vertical direction.

The lower frame outer surface bulging portion 22c and the lower frame inner surface bulging portion 22m are provided at opposing positions. Further, the outer surface beads 22d and 22e and the inner surface beads 22n and 22o are also provided at positions facing each other.
With this configuration, the rigidity of the lower seating side frame 22 can be further improved.

  Furthermore, an end portion of the seating side front frame 29a is disposed between the outer surface beads 22d and 22e and the inner surface beads 22n and 22o, and the other end portion is a lower seating side frame of the seating side frame 123. 24 (see FIGS. 2 and 8). If comprised in this way, since the connection strength of the seating side side frames 121 and 123 improves, it is preferable.

  The seating side frame 123 on the side where the shoulder anchor portion 14 is not disposed is disposed such that the upper seating side frame 23 and the lower seating side frame 24 are joined. The seating side frame 121 and the seating side frame 123 are preferably asymmetrical to each other.

  That is, it is preferable that the upper seating side frame 23 and the upper seating side frame 21 disposed on the side where the shoulder anchor part 14 is provided are formed in different shapes and sizes. Furthermore, it is preferable that the lower seating side frame 24 and the lower seating side frame 22 are formed in different shapes and sizes. In particular, it is preferable that the shape is different at a position corresponding to the connecting portion 21x.

  As described above, when the upper seating side frames 21 and 23 and the lower seating side frames 22 and 24 are formed asymmetrically with each other, it is possible to efficiently disperse and transmit a load from the side in particular. preferable.

  In the vicinity of the connecting portion 21x between the upper seating side frame 21 and the lower seating side frame 22, the edge on the side on which the occupant sits has a continuous shape, and is formed in a substantially arc shape. The side where the occupant sits at the connecting portion of the upper seating side frame 23 and the lower seating side frame 24 is also formed in a substantially arc shape, but the radius of the arc, that is, the curved shape is the seating side side. It is preferable that the frame 121 and the seating side frame 123 are formed differently.

  At this time, the radius of the arc in the vicinity of the connecting portion 21x of the upper seating side frame 21 and the lower seating side frame 22 provided below the shoulder anchor portion 14 is compared with the other seating side frame 123, Larger is preferable. That is, in the seating side frame 121 on the side where the shoulder anchor portion 14 is attached, the seating side edge of the connecting portion 21x is a gently curved shape compared to the equivalent portion of the other seating side frame 123. Is preferred. By setting it as this structure, the load from the shoulder anchor part 14 can be efficiently disperse | distributed to both the seating side side frames 121 and 123. FIG.

  Further, the lower seating side frame 24 disposed on the side where the shoulder anchor portion 14 is not provided is the lower seating side frame 22 formed by joining the lower outer surface material 22a and the lower inner surface material 22k to face each other. Unlike, it is formed of a single plate. Further, a bulging portion or a convex portion (not shown) bulging outward or inward of the seat is also provided on the surface of the lower seating side frame 24.

  The bulges or protrusions formed on the surface of the lower seating side frame 24 are different in shape and asymmetric from the lower frame outer bulges 22c and 22m provided on the other lower seating side frame 22. Preferably provided. With such a configuration, it becomes easier to disperse the load from the shoulder anchor portion 14.

  In particular, in the vicinity of the position corresponding to the connecting portion 21x of the seating side frame 121, it is preferable that the bulging portion or the convex portion is provided at an asymmetric position and shape.

  Hereinafter, other examples that can be applied to each member constituting the vehicle seat will be described with reference to the drawings. 9 to 11 show other examples of the vehicle seat. FIG. 9 is an enlarged explanatory view showing the configuration of the member pipe and the energy absorbing member, FIG. 10 is an explanatory view of the seating side frame, and FIG. It is explanatory drawing which shows the relationship between a seat back frame and a back cover.

(About the energy absorbing member 45)
FIG. 9 shows another example of the energy absorbing member, and is an enlarged explanatory view showing the configuration of the member pipe 40 and the energy absorbing member 45.
Unlike the above-described embodiment in which the energy absorbing member 44 is formed in a substantially rectangular shape, this example is characterized by the energy absorbing member 45 formed in a substantially linear shape. Except for the configuration of the energy absorbing member 45, the materials, effects, and the like used are the same as those in the above-described embodiment, and thus description thereof is omitted.

  In this example, the EA wire as the energy absorbing member 45 is formed in a substantially linear shape inside the seat back frame 1 and in the left-right direction as shown in FIG. 9 and is installed above the member pipe 40. . Then, the vicinity of both ends of the energy absorbing member 45 forms joints 45a and 45b along the surface of the member pipe 40, respectively. The joint portions 45 a and 45 b are provided in the vicinity of the side frame reinforcing member 30 and the side frame 12.

  At this time, if the end portion of the energy absorbing member 45 is joined to the side frame reinforcing member 30 and the side frame 12, the joining area of the energy absorbing member 45 becomes larger. Can be improved.

  Since the end portions 40a and 40b of the member pipe 40 have different mounting heights as described above, the energy absorption on the side of the end portion 40b installed at a low position, that is, the side where the shoulder anchor portion 14 is not installed. The vicinity of the end of the member 45 is bent and disposed. In the energy absorbing member 45, the vicinity of the joint portion 45b is bent and includes bent portions 45c and 45d. And the junction part 45b is contact | abutted and arrange | positioned along the length direction on the surface of the edge part 40b of the member pipe 40. As shown in FIG.

  As described above, the energy absorbing member 45 is constructed above the bent member pipe 40 so that the occupant's waist is supported when the occupant's lumbar moves backward, and the energy at the time of backward movement is absorbed. be able to.

  The energy absorbing members 44 and 45 having the above-described configuration are disposed at positions corresponding to the occupant's lumbar region, more specifically at positions corresponding to the fourth to fifth lumbar vertebrae, and are configured to move backward due to inertial force at the time of a rear collision. Energy can be absorbed effectively.

(About the seating side frame 121 ')
FIG. 10 shows another embodiment of the present invention and is an explanatory view of a seating side frame 121 ′. Unlike the above-described embodiment in which only the lower frame outer surface bulging portion 22c as the lower frame reinforcing portion is provided in the connecting portion 21x, the present embodiment further includes an outer surface convex portion 22f ′ as the lower frame reinforcing portion. It is characterized by that. In addition, regarding the seating side side frame 121 ′ which is another embodiment, the description of the configuration common to the seating side side frame 121 of the above embodiment is omitted.

  The outer convex portion 22f 'is a bead that bulges outward in the seat, and is curved in a shape along the upper side 22b' at a predetermined distance from the upper side 22b '. The lower frame outer surface bulging portion 22c 'is formed in a shape along the upper side 22b'. Similarly to the lower frame outer surface bulging portion 22c ', the lower frame inner surface bulging portion 22m' is also formed along the upper side 22l '.

  In the upper seating side frame 21 ′, an upper frame bulging portion 21 c ′ is formed along the edge 21 b ′, that is, a part of the outer periphery. In the above-described embodiment, the upper frame bulging portion 21c is provided over almost the entire region of the edge 21b. However, as in the present embodiment, the connecting portion provided below the upper outer surface material 21a '. It is good also as a structure provided only in the vicinity of 21x '.

  Further, the outer surface convex portion 22f 'is disposed on the lower outer surface material 22a', but is preferably provided also on the lower inner surface material 22k '. At this time, it is more preferable that an inner surface convex portion 22p 'as a lower frame reinforcing portion is provided in a position facing the outer surface convex portion 22f' in the lower inner surface material 22k '.

  Furthermore, it is preferable that beads such as the outer surface beads 22d and 22e in the above-described embodiment (see FIG. 8) are further provided and the two beads are formed so that the outer surface convex portion 22f ′ is connected. . Thus, when it is set as the structure which connects a some bead, the rigidity of lower seating side frame 22 'improves further.

  Thus, the upper frame bulge formed by bulging along the edge 21b ′ of the upper seating side frame 21 ′ at the connecting portion 21x ′ of the upper seating side frame 21 ′ and the lower seating side frame 22 ′. The connecting portion 21x ′ is received from the shoulder anchor portion 14 by including the protruding portion 21c ′ and the lower frame outer surface bulging portion 22c ′ formed by bulging along the upper side 22b ′ of the lower seating side frame 22 ′. Stiffness against load is improved.

(About the back cover 62)
As shown in FIG. 11, the seat back frame 1 may be provided with a back cover 62. The back cover 62 is a plate-like member formed of synthetic resin or the like, and is attached to the rear side of the seat back frame 1. And the back cover 62 is assembled | attached so that the back part of the cushion pad 1a may be covered with the skin material 1b.

  The back cover 62 includes a back surface portion 62a disposed at a position covering the back of the seat back frame 1, side surface portions 62b and 62c extending forward from the side of the back surface portion 62a, and from the side of the back surface portion 62a. A bottom surface portion 62d extending forward is provided. The back surface portion 62a is formed of a substantially rectangular flat plate material having an area that substantially covers the back of the seat back frame 1. Further, the side surface portions 62b and 62c are formed by planes extending forward substantially perpendicularly, and the bottom surface portion 62d is formed by extending forward in a shape bulging upward.

  The pipe reinforcing members 42 and 43 of the member pipe 40 are joined to the portion bulging above the bottom surface portion 62d. More specifically, the erected portions 42c and 43c of the pipe reinforcing members 42 and 43 are joined to the bulged portion of the bottom surface portion 62d.

  A hole that engages with the back cover mounting bracket 63 is formed above the back surface portion 62a of the back cover 62 and in the vicinity of the side frame 12 (that is, the side where the shoulder anchor portion 14 is not provided). The back cover mounting bracket 63 is engaged with the upper frame 13, and the back cover 62 is assembled to the seat back frame 1 with this configuration.

  Thus, below the seat back frame 1 of the present invention, the member pipe 40 having the bent portions 40c, 40d, 40e, and 40f and having a concave shape corresponding to the occupant's waist is disposed. . With such a configuration, the movement of the upper body of the occupant sinking into the seat back S1 is smoothly performed without the member pipe 40 hindering the movement of the occupant moving backward in the event of a rear collision.

  In each of the above-described embodiments, the vehicle seat used on the passenger seat side of the front seat of the automobile has been described as a specific example. However, the present invention is not limited thereto, and the vehicle seat on the driver seat side and the vehicle seat on the rear seat are described. Of course, a similar configuration can be applied.

DESCRIPTION OF SYMBOLS S Vehicle seat S1 Seat back S2 Seating part S3 Headrest B Seat belt B1 Shoulder belt part F Seat frame 1 Seat back frame 2 Seating frame 3 Core material 1a, 2a, 3a Cushion pad (pad material)
1b, 2b, 3b Skin material 11, 12 Side frame 11a Closed cross-section structure part 11b Extension part 11c Hole 13 Upper frame 13a Side face part 14 Shoulder anchor part 15 Reclining device 21, 23, 21 'Upper seating side frame 22, 24, 22 'lower seating side frame 21a, 21a' upper outer surface material 21b, 21b 'edge 21c, 21c' upper frame bulging part (upper frame reinforcing part)
21k Upper inner surface material 21x, 21x 'connecting portion 22a, 22a' Lower outer surface material 22b, 22l, 22b ', 22l' Upper side 22c, 22c 'Lower frame outer surface bulging portion (lower frame reinforcing portion)
22d, 22e outer surface bead 22f 'outer surface convex portion (lower frame reinforcing portion)
22k, 22k 'Lower inner surface material 22m, 22m' Lower frame inner surface bulging portion (lower frame reinforcing portion)
22n, 22o inner surface bead 22p 'inner surface convex part (lower frame reinforcing part)
25 Upper rail 26 Lower rail 27 Cushion support member 28 Seat side rear frame 29a, 29b Seat side front frame 30 Side frame reinforcement member 40 Member pipe (connection member)
40a, 40b End portion 40c, 40d, 40e, 40f Bent portion 40g Center portion 42, 43 Pipe reinforcing member 42a, 42b, 43a, 43b Reinforcing member joint portion 42c, 43c Installation portion 43d, 43e Leg portion 43f, 43g Convex portion ( bead)
43i hole 44, 45 energy absorbing member (frame-like member)
44a, 44b, 45a, 45b Joining portion 45c, 45d Bending portion 50 Retractor mounting bracket 51 Lower connecting member 54 Retractor (sheet device portion)
61 Construction member 62 Back cover 62a Back surface part 62b, 62c Side surface part 62d Bottom surface part 63 Back cover mounting bracket 121, 123, 121 'Seat side frame

Claims (9)

A seat back frame having a pair of side frames, an upper frame for connecting the pair of side frames at the top, and a connecting member for connecting the pair of side frames at the bottom;
A frame-like member disposed at a substantially central position of the connecting member,
The connecting member has a horizontal portion located in the center and extending in the horizontal direction, and left and right bent portions bent from the left and right ends of the horizontal portion,
The frame-shaped member is formed in a frame shape by bending a linear member, and is joined to the horizontal portion of the connecting member.   2. The vehicle seat according to claim 1, wherein a joint portion between the connecting member and the pair of side frames is disposed at a position where the left and right are different in height.   2. The vehicle seat according to claim 1, wherein a joint portion between the connecting member and the pair of side frames is disposed at substantially the same height on the left and right.   The vehicle seat according to claim 2, wherein the horizontal portion is disposed at a position lower than a joint portion between the connecting member and the pair of side frames.   The plate-like member is joined to the connecting member, and the plate-like member and the frame-like member are disposed so as to overlap in a front view. Vehicle seat. The frame-shaped member is formed in a substantially U-shape having an opening where at least a part of one side is not continuous, and the opening is joined to the connecting member facing the connecting member,
The vehicle seat according to any one of claims 1 to 5, wherein a joint portion of the frame-shaped member with the connecting member is bent inward in the seat width direction.   The vehicle seat according to any one of claims 1 to 6, wherein a thickness of the connecting member is thicker than a thickness of the frame-shaped member.   The plate member is joined to the connecting member, and at least a part of the plate member is disposed in the frame of the frame member. Vehicle seat. A reclining device provided below the pair of side frames,
The vehicle seat according to any one of claims 1 to 8, wherein a height of a central axis of the reclining device and a height of a joint portion between the pair of side frames of the connecting member are different.

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