JP4725135B2 - Vehicle seat back frame structure - Google Patents

Description

  The present invention relates to a structure of a seat back frame of a seat mounted on a vehicle such as an automobile, and more particularly to a structure in which a resin frame body and a metal member are combined.

  As a conventional seat back frame structure, for example, a metal pipe material is arranged on the outer periphery, and a metal plate material such as a steel plate is disposed in a region substantially surrounded by the pipe material. Is common. By covering the seat back frame having such a configuration with a cushion material, a skin material, or the like, a seat back that supports the back of the occupant seated on the seat is formed.

By the way, in recent years, as a part of weight reduction of the vehicle, there has been a demand for further weight reduction of the seat. Therefore, it is considered to reduce the weight of the seat back frame that occupies a relatively large weight among the seat constituent members by configuring the main part thereof with a resin molded body. At that time, in order to ensure the strength and rigidity required for the seat back frame, measures such as partial reinforcement with a metal member are generally taken. For example, Patent Document 1 discloses a structure in which a frame body formed of a metal plate material and a metal pipe is covered with a resin molded body obtained by blow molding. The metal frame body is disposed over the entire circumference along the outer edge of the resin molded body.
JP 2000-023777 A

  Thus, although a reinforcement effect can be heightened by using a metal member, on the other hand, there exists a problem that use of a metal member will become the obstruction factor of weight reduction. In the structure disclosed in Patent Document 1, in order to obtain an appropriate reinforcing effect, it is necessary to dispose a metal member having a thickness of a certain degree or more over the entire circumference along the outer edge of the resin molded body. That is, since a relatively large amount of metal members are required, it is difficult to meet the demand for further weight reduction.

  In view of the circumstances as described above, the present invention achieves a significant reduction in weight by combining a resin frame body and a metal member that is as small as possible, and puts a metal member having an appropriate shape in an appropriate position on the resin frame body. It is an object of the present invention to provide a vehicle seat back frame structure that can steadily ensure the strength and rigidity required for the seat back frame.

  In order to solve the above-mentioned problems, the invention of claim 1 includes a flat resin frame body provided with a cushion material support portion for supporting the back side of the cushion material of the seat back, a lower end portion of the resin frame body, and A metal hinge member that is provided at an end in the vehicle width direction and connects the resin frame body to the vehicle side, and extends substantially along the upper side of the resin frame body over substantially the entire width of the resin frame body. And a first metal frame body to which a support member for supporting the headrest is attached, and an approximately vertical direction extending in a vehicle width direction intermediate region of the resin frame body, and one end side of the first metal frame body is the first metal frame body. One end of the metal frame body is joined to the middle portion in the vehicle width direction, and the other end side extends to the substantially lower side portion of the resin frame body, and further extends substantially along the lower side portion in the vehicle width direction. Is the metal A vehicle seat back frame structure including a second metal frame body joined to the first member, wherein the seat belt is disposed above the resin frame body at a position spaced apart from the first metal frame body. A retractor mounting portion for mounting the retractor is provided, and a cross-sectional bent portion is formed in a substantially vertical direction below the retractor mounting portion in the resin frame body, and the retractor is connected to the retractor via a retractor support bracket. The retractor support bracket is attached to the attachment portion, and the retractor support bracket is joined to the first metal frame body and the cross-sectional bent portion.

  According to a second aspect of the present invention, in the vehicle seat back frame structure according to the first aspect, the resin frame body is formed to have a hollow shape.

  According to a third aspect of the present invention, in the vehicle seat back frame structure according to the second aspect, the cross-sectional bent portion includes a closed cross-sectional portion formed independently of the cross-sectional bent portion, and the cross-sectional bent portion. It is characterized in that it has at least one shape among a projecting portion projecting inside the cross section and a projecting portion projecting outside the cross section of the cross section bent section.

  According to a fourth aspect of the present invention, in the vehicle seat back frame structure according to the second or third aspect, the resin frame body extends substantially vertically in a portion other than the flat plate portion of the cushion material support portion, Reinforcing ribs having a concave cross section that immerses inwardly of the hollow cross section are integrally formed, and the reinforced ribs have their recessed bottom surfaces joined to opposing surface portions of the resin frame body. .

  According to a fifth aspect of the present invention, in the vehicle seat back frame structure according to any one of the second to fourth aspects, the resin frame body is formed by a blow molding method. To do.

  According to a sixth aspect of the present invention, in the vehicle seat back frame structure according to any one of the first to fifth aspects, the cross-sectional bent portion is formed substantially along a side end portion of the resin frame body. It is characterized by being.

  According to a seventh aspect of the present invention, in the vehicle seat back frame structure according to any one of the first to sixth aspects, the retractor support bracket is located on the front side of the retractor with the retractor attached. It is characterized by being arranged.

  The invention according to claim 8 is the seat back frame structure of the vehicle according to any one of claims 1 to 7, wherein the seat back frame structure is applied to a rear seat of a wagon type vehicle or a hatch back type vehicle. It is characterized by being.

  In this specification, when referring to directions such as up, down, front, back, left and right, unless otherwise noted, the seat is in a state in which the occupant is seated facing the vehicle forward direction, and the seat back is set up in a substantially vertical direction. It shall be the direction when the state is entered.

  According to the first aspect of the present invention, the main part of the seat back is formed into a flat resin frame body, and the weight of the seat back is greatly reduced. Can be reinforced. For example, the bending strength and rigidity in the vehicle width direction can be increased by the first metal frame extending in the vehicle width direction. Moreover, since the supporting member which supports a headrest is attached to the 1st metal frame body, the support rigidity of a headrest can be improved. Furthermore, the bending strength and rigidity in the vertical direction can be increased by the second metal frame extending in the vertical direction.

  Moreover, the connection intensity | strength can be raised by providing a metal hinge member in the connection part with the vehicle side. In particular, when the seat is made to be retractable, a load is repeatedly applied to the hinge portion. Therefore, by making it a metal, a more remarkable strength improvement effect can be obtained.

  Then, by joining one end of the second metal frame body to the first metal frame body and joining the other end to the metal hinge member, the metal member extending from the first metal frame body to the metal hinge member Since the continuous body is formed, the rigidity of the seat back frame is improved as a whole.

  In addition, since the second metal frame body is disposed in the intermediate region in the vehicle width direction of the resin frame body, for example, the vehicle suddenly stops with the luggage placed behind the seat back, When the vehicle moves forward and collides with the seat back, the collision load can be steadily received by the second metal frame body, and deformation and breakage of the seat back can be suppressed.

  Moreover, in the cross-sectional bending part provided in the resin-made frame body, rigidity is improved by the cross-sectional shape bent. By joining the retractor support bracket to the bent portion of the cross section and further joining to the first metal frame body, the support strength and rigidity of the retractor can be increased with a simple structure.

  As described above, according to the present invention, a metal member having an appropriate shape is placed at an appropriate position of the resin frame body while achieving a significant weight reduction by combining the resin frame body and a metal member as small as possible. By disposing, the strength and rigidity required for the seat back frame can be steadily secured.

  According to the invention of claim 2, the same effect as that of the invention of claim 1 can be obtained. In particular, by making the resin frame body hollow, it is possible to further reduce the weight of the resin frame body with a relatively simple structure.

  Furthermore, according to the invention of claim 3, the same effect as that of the invention of claim 2 can be obtained. In particular, the cross-sectional bent portion is a closed cross-sectional portion formed independently of the cross-sectional bent portion, a protruding portion that protrudes inside the cross-section of the cross-sectional bent portion, and protrudes outside the cross-section of the cross-sectional bent portion. Since the projection has at least one shape, the cross-sectional rigidity of the cross-section bent portion can be further enhanced while having a relatively simple and light-weight structure.

  According to the invention of claim 4, the same effect as that of the invention of claim 2 or 3 can be obtained. In particular, the resin frame body is integrally formed with a reinforcing rib having a concave cross section extending substantially in the vertical direction and entering the inside of the hollow cross section in a portion other than the flat plate portion of the cushion material support portion. In addition, since the immersed bottom surface portion is joined to the opposing surface portions of the resin frame body, without increasing the thickness of the resin frame body or increasing the thickness of the entire seat back frame, The strength and rigidity of the resin frame itself can be further increased with a relatively simple structure.

  According to the invention of claim 5, the same effect as that of any one of claims 2 to 4 can be obtained. In particular, a resin frame body having a hollow shape can be integrally formed relatively easily and at low cost by a blow molding method excellent in mass productivity.

  According to the invention of claim 6, the same effects as those of the invention of any one of claims 1 to 5 can be obtained. In particular, since the cross-sectionally bent portion is formed substantially along the side end portion of the resin frame body, it is possible to increase the support rigidity of the retractor support bracket and to increase the bending and torsional rigidity of the resin frame body itself. it can.

  According to the invention of claim 7, the same effect as that of any one of claims 1 to 6 can be obtained. In particular, since the retractor support bracket is disposed on the front side of the retractor in a state where the retractor is attached, an effect as a protective member (cover) of the retractor can also be achieved. Therefore, the retractor can be protected with a simple structure without increasing the number of parts.

  According to the eighth aspect of the invention, the same effect as that of the first aspect of the invention can be achieved. In particular, a wagon type vehicle or a hatchback type vehicle does not have a vertical wall portion that rises from the floor panel behind the rear seat, unlike a sedan type vehicle, so the seat back of the rear seat is not supported from the back side, and in the vehicle width direction. It is supported by the vehicle at the end. That is, it is necessary to ensure the necessary strength and rigidity in the seat back frame itself near the center in the vehicle width direction. In such a case, the structure of the present invention, in particular, the structure in which the second metal frame body is disposed in the intermediate region in the vehicle width direction of the resin frame body has a remarkable effect.

  Hereinafter, a case where an embodiment of the present invention is applied to, for example, a rear seat of a wagon type or hatchback type automobile will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a seat back frame 1 of an automobile seat according to a first embodiment of the present invention. FIG. 2 is a front view of the seat back frame 1 shown in FIG. 3 is a cross-sectional view taken along the line II of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line II-II of FIG. FIG. 5 is an enlarged view of a portion E in FIG. 6 is a cross-sectional view taken along line III-III in FIG.

  As shown in these drawings, the main configuration of the seat back frame 1 is a combination of a metal frame body 10 and a resin frame body 20. Metal hinge members that connect the resin frame body 20 to the vehicle side (specifically, the rear portion of a seat seat (seat cushion) not shown) at the lower end of the resin frame body 20 and at both ends in the vehicle width direction. 4 are fixed respectively. A seat back 71 (shown by a two-dot chain line in FIG. 1) provided with the seat back frame 1 is a retractable type, and is rotatable around a metal hinge member 4.

  As shown in the drawing, the metal frame body 10 includes a first metal frame body 11 extending substantially along the upper side of the resin frame body 20 over substantially the entire width of the resin frame body 20, and a resin. The frame body 20 includes a second metal frame body 12 extending substantially vertically in the vehicle width direction intermediate region.

  The second metal frame body 12 has an upper end side joined to a middle part in the vehicle width direction of the first metal frame body 11 and extends vertically from the joining position to a substantially lower side of the resin frame body 20. And a laterally extending portion 12b that extends in the vehicle width direction substantially along the lower side portion of the resin frame body 20 and whose end portion is joined to the metal hinge member 4 is integrally molded. is there. Therefore, the vertical frame portion 12 a is disposed in the intermediate region in the vehicle width direction of the resin frame body 20.

  Thus, the metal frame body 10 as a whole is formed in a front shape similar to a shape obtained by extending one side of the upper side of the alphabet capital letter “J”. This is because the total length of the metal frame is shorter than that of the conventional structure in which the metal frame is disposed over substantially the entire periphery of the outer edge of the seat back.

  The first metal frame body 11 and the second metal frame body 12 are made of, for example, a metal pipe material such as a steel pipe having an annular cross section, and the second metal frame body 12 is formed by bending, for example, by pressing. It is manufactured by.

  As shown in FIG. 1, a support member 2 that supports a headrest 72 (indicated by a two-dot chain line together with the headrest frame 3) that supports the occupant's head is attached to the first metal frame body 11. .

  The main part of the resin frame body 20 is integrally formed by a blow molding method into a hollow flat shape in which a space is formed between thin plate-like members separated in the front-rear direction (see FIGS. 3 to 6). The resin frame body 20 includes a cushion material support portion 21a that supports the back side of the cushion material of the seat back 71, and an armrest placement portion 21b in which an armrest is disposed on the side of the vertical frame portion 12a in the vehicle width direction. have.

  The cushion material support portion 21a and the armrest placement portion 21b are mainly composed of a flat plate portion 21c and a reinforcing rib 15, respectively. The reinforcing rib 15 is a portion having a concave cross section extending substantially in the vertical direction and immersing into the inner side of the hollow cross section, and the recessed bottom surface portion is joined to the opposing surface portions of the resin frame body 20. A recess similar to the reinforcing rib 15 is also formed at the boundary between the cushion material support portion 21a and the armrest placement portion 21b, and the vertical frame portion 12a of the second metal frame body 12 is housed in the recess. Yes.

  A retractor mounting portion 1c for attaching the retractor 85 of the seat belt 86 is provided on the upper side of the resin frame body 20 (upper right side in the state shown in FIG. 2) and at a position separated from the first metal frame body 11. ing. In addition, a cross-sectional bent portion 20a is formed along the substantially vertical direction below the retractor mounting portion 1c of the resin frame body 20. And the retractor 85 is attached to the retractor attachment part 1c via the retractor support bracket 80, and the retractor support bracket 80 is joined to the 1st metal frame 11 and the cross-sectional bending part 20a.

  In the retractor mounting portion 1c, the resin frame body 20 is not provided with a hollow portion. That is, the thickness in the front-rear direction is thinner than other portions where the hollow portion is provided, and a recess is formed on the front side. A retractor 85 is stored in the recess.

  The retractor support bracket 80 for attaching the retractor 85 is made of a metal plate-like body, and its main part is provided along the plate surface of the retractor mounting part 1c. In the state shown in FIG. 2, a metal catch fixing member 83 is erected on the right side of the retractor 85 so as to be substantially perpendicular to the plate surface of the retractor support bracket 80. The catch fixing member 83 is a member that fixes an unillustrated catch that engages with an unillustrated striker provided on the vehicle side. That is, the seat back 71 is pivotable about the metal hinge member 4, but is fixed to the vehicle side via the catch fixing member 83 in order to maintain the standing state. The

  The upper part of the retractor support bracket 80 is joined to the first metal frame body 11. Further, it is joined to the resin frame body 20 at the three joints (lower joint 80a, lower left joint 80b, left joint 80c) from the left to the bottom in the direction shown in FIG. The resin frame body 20 in the joint portion 80a has a cross-sectional bent portion 20a (see FIG. 5), and the rigidity is enhanced. The cross-sectional bent part 20a of the present embodiment is a closed cross-sectional part 29 formed independently of the cross-sectional bent part 20a. The cross-sectional bent portion 20a is formed substantially along the side end portion (the right end portion in the state shown in FIG. 2) of the resin frame body 20.

  The cross-sectional bent part 20a will be described in detail with reference to FIG. In the description of FIG. 5, the vertical and horizontal directions are in accordance with the state shown in the drawing. The cross-section bent portion 20a has a substantially flat hollow cross section by the inner side surface portion 23, the outer side surface portion 24, the upper surface portion 21, and the lower surface portion 22, and the lower end side of the inner side surface portion 23 is lower than the lower lower surface portion 22. Thus, a closed cross-section 29 is formed by joining at the joint 27. The joint 80 a is bent along the outer surface 24, the upper surface 21, and the inner surface 23, and is joined to the resin frame body 20 by rivets 81 at the joint 27.

  Such a closed cross-sectional portion 29 is integrally formed with the resin frame body 20 at the outer edge portion of the resin frame body 20 where the metal frame body 10 is not disposed. The outer edge portion provided with the closed cross-section portion 29 is joined to the metal frame body 10 by, for example, rivet joining.

  As shown in FIG. 6, the resin frame body 20 in the joint 80 b has a closed cross-sectional portion 29 similar to the cross-sectional bent portion 20 a, and has increased rigidity. The closed cross section 29 in the joint 80b will be described in detail with reference to FIG. In the description of FIG. 6, the vertical and horizontal directions are in accordance with the state shown in the figure. The closed cross-sectional portion 29 has a substantially flat hollow cross section by the inner side surface portion 23, the outer side surface portion 24, the upper surface portion 21, and the lower surface portion 22, and the lower end side of the inner side surface portion 23 is lower than the lower lower surface portion 22. A closed cross-section 29 is formed by joining at the joint 27.

  The joint 80 b is bent along the outer surface 24, the upper surface 21, and the inner surface 23, and is joined to the resin frame body 20 by rivets 81 at the joint 27. In addition, although it does not show in particular about the junction part 80c, it has the same structure as the junction part 80b.

  The seat back frame configured as described above is greatly reduced in weight by making the main part of the seat back 71 the flat resin frame body 20, and is provided with a metal member (first member) disposed at an appropriate position. The resin frame body 20 is effectively reinforced by the metal frame body 11, the second metal frame body 12, the metal hinge member 4, the retractor support bracket 80, and the support member 2). For example, the bending strength and rigidity in the vehicle width direction are increased by the first metal frame body 11 extending in the vehicle width direction. Further, the support rigidity of the headrest 72 is enhanced by the support member 2 attached to the first metal frame body 11. Further, the bending strength and rigidity in the vertical direction are enhanced by the second metal frame body 12 extending in the vertical direction.

  Moreover, the connection strength is raised by providing the metal hinge member 4 in the connection part with the vehicle side. In particular, when the seat is made to be retractable, a load is repeatedly applied to the hinge portion. Therefore, by making it a metal, a more remarkable strength improvement effect can be obtained.

  Then, one end of the second metal frame body 12 is joined to the first metal frame body 11, and the other end is joined to the metal hinge member 4, whereby the metal hinge member 4 is moved from the first metal frame body 11. Thus, the rigidity of the seat back frame 1 is improved as a whole.

  In addition, since the second metal frame body 12 is disposed in the middle region in the vehicle width direction of the resin frame body 20, for example, the vehicle suddenly stops in a state where a load is placed behind the seat back 71. When the load moves forward and collides with the seat back 71, the collision load is steadily received by the second metal frame body 12, and deformation and breakage of the seat back 71 can be suppressed.

  Further, the rigidity of the cross-section bent portion 20 a provided in the resin frame body 20 is enhanced by the closed cross-section portion 29. By joining the retractor support bracket 80 to the cross-section bent part 20a and further joining to the first metal frame body 11, the support strength and rigidity of the retractor 85 are enhanced with a simple structure.

  As described above, a metal member having an appropriate shape is disposed at an appropriate position of the resin frame body 20 while significantly reducing the weight by combining the resin frame body 20 and a metal member as small as possible. Thus, the strength and rigidity required for the seat back frame 1 are steadily secured.

  Furthermore, by making the resin frame body 20 hollow, the resin frame body 20 is further reduced in weight with a relatively simple structure.

  Further, since the cross-sectional bent portion 20a of the resin frame body 20 is formed substantially along the side end portion of the resin frame body 20, the support rigidity of the retractor support bracket 80 is enhanced and the resin frame body 20 is also increased. It increases its own bending and torsional rigidity.

  Further, unlike the sedan type vehicle, the wagon type vehicle or the hatchback type vehicle of the present embodiment is not provided with a vertical wall portion that rises from the floor panel behind the rear seat, so the seat back 71 is not supported from the back side. The end portion in the vehicle width direction is supported by the vehicle via the catch fixing member 83. That is, it is necessary to ensure the strength and rigidity necessary for the seat back frame 1 in the vicinity of the center in the vehicle width direction. The structure of this embodiment can be expected to have a particularly remarkable effect on such a seat back 71.

  Next, the structure around the cushion material support portion 21a, such as the resin frame body 20, and the blow molding method will be described in detail. FIG. 7 is a perspective view of the resin frame body 40 schematically shown by cutting out a part of the resin frame body 20 (particularly, the cushion material support portion 21a). 8 is a cross-sectional view taken along line XI-XI in FIG. 7, and FIG. 9 is a cross-sectional view taken along line XII-XII in FIG. FIG. 10 is a perspective view schematically showing a part of a molding die of the resin frame body 40. 7 to 9, the vertical and horizontal directions are the same as the directions shown in the drawings. The state shown in FIG. 7 is a state in which the upper and lower sides on the paper surface are reversed with respect to the state shown in FIG.

  As shown in FIGS. 7 to 9, the resin frame body 40 includes a hollow portion 40 </ b> H that is formed in a substantially flat shape by a pair of opposing wall surface portions 41, 42 and a pair of side wall portions 43.

  A plurality of reinforcing ribs 45 (corresponding to the reinforcing ribs 15 shown in FIG. 1 and the like) are provided on the lower side of the wall surface portion 41 on one side (lower side in FIGS. 7 to 9) of the hollow portion 40H. The concave portion is recessed inwardly inward (upper side in FIGS. 7 to 9), and the concave portion is formed with a connecting portion 45A having a predetermined length in which the bottom 45t is connected to the wall surface portion 42 on the other side. The side wall portions 45s are joined to each other, and a node portion 45B having a predetermined length is formed.

  The connecting portions 45 </ b> A and the node portions 45 </ b> B are provided alternately along the longitudinal direction of each reinforcing rib 45. More preferably, as shown in the drawing, a plurality of reinforcing ribs 45 extending in parallel are arranged in the rib longitudinal direction of the connecting portion 45A and the node portion 45B so that the connecting portions 45A and 45A of the adjacent reinforcing ribs 45 are connected to each other. It is set so as to alternate with the joint 45B.

  Such a reinforcing rib 45 can be integrally formed with the resin frame body 40 when the resin frame body 40 is blow-molded by using a mold D as shown in FIG. That is, the mold D includes a flat wall surface molding portion D1 (molding surface) corresponding to the wall surface portion 41 on one side (lower side in FIGS. 7 to 9) of the hollow portion 40H of the resin frame body 40, and a hollow portion. And a plurality of rib forming portions D2 corresponding to the reinforcing ribs 45 projecting into 40H.

  Each rib forming portion D2 has a convex portion D2a having a predetermined length that protrudes to the vicinity of the surface of another molding die (not shown) combined with the die D, and the protruding amount is considerably larger than that of the convex portion D2a. Small concave portions D2b having a predetermined length are alternately formed along the longitudinal direction of the rib forming portion D2. Further, with respect to the plurality of parallel rib forming portions D2, the arrangement positions of the convex portions D2a and the concave portions D2b in the rib longitudinal direction are staggered from the convex portions D2a and the concave portions D2b of the adjacent rib forming portions D2. Is set to

  By performing blow molding using the mold D having such a configuration, in the convex portion D2a of the rib molding portion D2, a blow molded resin material (so-called parison) is recessed in a cross-sectional shape, and the bottom portion is the other The connecting portion 45A having a predetermined length is formed by connecting to the side wall portion. Further, in the concave portion D2b of the rib forming portion D2, the side wall portions of the resin material forming the concave shape are contacted / pressed by the blow pressure and joined to each other, thereby forming a node portion 45B having a predetermined length. .

  As described above, the reinforcing rib 45 (corresponding to the reinforcing rib 15) having a concave cross section extending substantially vertically in the resin frame body 40 (corresponding to the resin frame body 20) and entering the inner side of the hollow cross section. ) And the reinforcing ribs 45 are joined to the opposing surface portions of the resin frame body 30 so that the thickness of the resin frame body 40 can be increased. Without increasing the overall thickness of the frame 1, the strength and rigidity of the resin frame body 40 itself are increased with a relatively simple structure.

  Moreover, since such a blow molding method is excellent in mass productivity, the resin frame body 40 is integrally molded relatively easily and at low cost.

  Next, another embodiment according to the present invention will be described. FIG. 11 is a partial perspective view of the seat back frame according to the second embodiment of the present invention, and FIG. 12 is a sectional view taken along line IV-IV in FIG. Note that, in the following second and subsequent embodiments, the same members as those in the first embodiment are denoted by the same reference numerals, and redundant description thereof is omitted. Further, parts that are not particularly described are the same as those in the first embodiment.

  The second embodiment is different from the first embodiment in that a retractor support bracket 90 is provided instead of the retractor support bracket 80. The retractor support bracket 90 is a plate-like body formed in a substantially box shape, and is provided on the front side of the retractor 85 so as to cover the retractor 85. The first metal frame body 11 is provided so as to penetrate the retractor support bracket 90, and is joined to the retractor support bracket 90 by welding or the like at the penetration portion.

  Further, the catch fixing member 83 is joined to the retractor support bracket 90 by welding at the lower end bent portion.

  The retractor support bracket 90 is provided with joint portions 90a, 90b, and 90c similar to the joint portions 80a, 80b, and 80c of the first embodiment, and is joined to the resin frame body 20 by rivets 81, respectively.

  The retractor 85 is fixed to the bracket 85a. The bracket 85a is fixed to an anchor bolt 85b welded to the retractor support bracket 90 by tightening a nut. As a detent, the retractor support bracket 90 and the bracket 85a are joined by two tappings 85c. An opening 90d is provided in the upper part of the retractor support bracket 90, and the seat belt 86 pulled out from the retractor 85 is led out.

  With such a configuration, the retractor support bracket 90 can also exert an effect as a protective member (cover) of the retractor 85. Therefore, the retractor 85 is protected with a simple structure without increasing the number of parts.

  13 is a partial perspective view of a seat back frame according to a third embodiment of the present invention, and FIG. 14 is a cross-sectional view taken along line VV in FIG.

  The third embodiment differs from the second embodiment in that a cross-sectional bent portion 20b is formed instead of the cross-sectional bent portion 20a of the resin frame. Further, a difference is that a retractor support bracket 93 is provided instead of the retractor support bracket 90.

  The cross-sectional bent part 20b is a solid part provided over the retractor mounting part 1c flat plate part 21c, and a flange nut 95 is embedded (insert molding). The joint portion 93 a of the retractor support bracket 93 is bent along the shape of the cross-section bent portion 20 b and is joined to the cross-section bent portion 20 b by a bolt 94 that engages with the flange nut 95.

  Similarly, the joint portions 93 b and 93 c are joined to the resin frame body 20 by bolts 94 that engage with flange nuts 95 embedded in the resin frame body 20.

  With such a configuration, it is possible to obtain the same operations and effects as in the first and second embodiments.

  15 is a partial perspective view of a seat back frame according to a fourth embodiment of the present invention, and FIG. 16 is a sectional view taken along line VI-VI in FIG.

  The fourth embodiment is different from the third embodiment in that a cross-sectional bent portion 20c is formed instead of the cross-sectional bent portion 20b of the resin frame body. Further, the retractor support bracket 97 is provided in place of the retractor support bracket 93.

  A metal pipe 98 is provided along a recess between the cross-section bent portion 20c and the cushion material support portion 21a. The upper end of the metal pipe 98 is fixed to the catch fixing member 83, and the lower end is fixed to the metal hinge member 4. The joint portion 97a of the retractor support bracket 97 is bent so as to include the cross-sectional bent portion 20c and the metal pipe 98, and is fixed to the metal pipe 98 by a welded portion 98W.

  With such a configuration, it is possible to obtain the same operations and effects as in the first and second embodiments. In particular, from the first metal frame body 11 to the metal hinge member 4, a continuous body of metal members is formed via a retractor support bracket 97, a catch fixing member 83, and a metal pipe 98. The support rigidity of the retractor support bracket 97 to be joined is increased.

  17 is a partial perspective view of a cross-sectional bent portion 39 in the resin frame 30 according to the fifth embodiment of the present invention, FIG. 18 is a cross-sectional view taken along line VII-VII in FIG. 17, and FIG. It is a VIII-VIII line sectional view. Note that the vertical and horizontal directions in FIGS. 17 to 19 are the same as those shown in FIG.

  The fifth embodiment differs from the first embodiment in that a resin frame body 30 having a cross-sectional bent portion 39 is provided instead of the resin frame body 20 having a cross-sectional bent portion 20a. Yes.

  As shown in FIGS. 17 to 19, the cross-sectional bent portion 39 of the resin frame 30 is a hollow portion formed in a substantially flat shape with a pair of side surface portions 33, 34 and upper and lower surface portions 31, 32 facing each other. 30H.

  The side wall ribs 35 extending along the outer edge of the resin frame 30 protrude from the opposite side portions 33 and 34 on both sides of the hollow portion 30H into a substantially U-shaped cross section toward the inside of the hollow portion 30H. Is formed. And about this pair of protrusion part 36 and 37 which mutually opposes, the connection part 35A of the predetermined length which connected the top parts 36t and 37t mutually, and each protrusion part 36 and 37 which each form U shape Is provided with a node portion 35B having a predetermined length formed by joining the side wall portions 36s and 37s to each other. These connecting portions 35 </ b> A and node portions 35 </ b> B are alternately provided along the side wall ribs 35.

  Like the side wall rib 35, the protruding portion protruding into the cross section is integrally formed with the resin frame body 30 even at the outer edge portion of the resin frame body 30 where the metal frame body 10 is not disposed. Yes.

  As described above, the resin frame body 30 is set to have a cross-sectional rigidity higher than that of the flat plate portion 21c at the outer edge portion of the resin frame body 30 in which the cross-section bent portion 39 and the metal frame body 10 are not disposed. Since the cross-sectional rigidity improving portions such as the projecting portions 36 and 37 are integrally formed, the support rigidity of the retractor support bracket 80 is increased and the torsional rigidity of the entire seat back frame 1 is increased.

  Further, the cross-sectional bent portion 39 of the resin frame body 30 includes projecting portions 36 and 37 projecting into the inside of the cross section, and is formed substantially along the outer edge portion of the resin frame body 30. The cross-sectional rigidity can be improved with a relatively simple structure, and the above effect can be obtained more reliably.

  In the present embodiment, the cross-section bent portion 39 includes the projecting portions 36 and 37 projecting into the inside of the cross section, but the projecting shape projecting to the outside of the cross section is set higher in cross-sectional rigidity than the flat plate portion 21c. May be provided.

  In addition, as a modification of the present embodiment, for example, a shape provided with ribs that divide the inside of the cross-section bent portion 39 into upper and lower portions, or other shapes having a higher cross-sectional rigidity than the flat plate portion 21c may be used. . Further, as shown in FIG. 17, the cross-sectional bent portion 39 does not necessarily have a closed cross-sectional shape.

  20 is a perspective view of a resin frame body 50 (corresponding to the resin frame body 40 of the first embodiment) according to the sixth embodiment of the present invention, and FIG. 21 is a cross-sectional view taken along the line XIV-XIV in FIG. 22 and 22 are cross-sectional views taken along the line XV-XV in FIG. 21 to 22, the up, down, left, and right directions conform to the directions shown in the drawings.

  As shown in FIGS. 20 to 22, the resin frame body 50 includes a hollow portion 50 </ b> H that is formed in a substantially flat shape with a pair of opposing wall surface portions 51, 52 and a pair of side wall portions 53.

  The plurality of reinforcing ribs 55 (corresponding to the reinforcing ribs 15 shown in FIG. 1 and the like) are cross-sections of the facing portions of the wall portions 51 and 52 on the upper and lower sides of the hollow portion 50H toward the inside of the hollow portion 50H. It is formed in a concave shape. The pair of concavities 56 and 57 facing each other have a predetermined length connecting portion 55A in which the bottom portions 56t and 57t are connected to each other, and the respective concave portions 56 and 57 each forming a concave shape. 56s and 57s are joined together, and it is comprised including the node part 55B of the predetermined length formed. The connecting portions 55 </ b> A and the node portions 55 </ b> B are alternately provided along the longitudinal direction of each reinforcing rib 55.

  FIG. 23 is a perspective view of a resin frame body 60 (corresponding to the resin frame body 40 of the first embodiment) according to the seventh embodiment of the present invention. In FIG. 23, the up, down, left, and right directions conform to the directions shown in the figure.

  As shown in FIG. 23, the resin frame body 60 includes a hollow portion 60 </ b> H that is formed in a substantially flat shape by a pair of opposing wall surface portions 61 and 62 and a pair of side wall portions 63.

  A plurality of reinforcing ribs 65 (corresponding to the reinforcing ribs 15 shown in FIG. 1 and the like) are formed such that the upper wall surface 62 of the hollow portion 60H is recessed in a cross-section toward the inside (downward) of the hollow portion 60H. And the wall surface 61 on the lower side that are recessed in the shape of a concave section toward the inside (upward) of the hollow portion 60H are set to be alternately arranged.

  Each reinforcing rib 65 includes a connecting portion 65A and a node portion 65B having a predetermined length having the same cross-sectional structure as that shown in FIGS. 7 to 9, and the connecting portion 65A and the node portion 65B are defined as follows. The reinforcing ribs 65 are alternately provided along the longitudinal direction. In addition, with respect to the plurality of reinforcing ribs 65 extending in parallel, the disposition positions of the connecting portions 45A and the joint portions 45B in the longitudinal direction of the ribs are set alternately with the connecting portions 65A and the joint portions 65B of the adjacent reinforcing ribs 65. ing.

  Also in the resin frame bodies 50 and 60 according to the sixth and seventh embodiments described above, the reinforcing ribs 55 and 65 are configured as described above, so that the resin frame body 40 shown in FIGS. Similarly to the case, the resin frame bodies 50, 60 are integrally formed with reinforcing ribs 55, 65 having a concave cross section extending substantially in the vertical direction and entering the inside of the hollow cross section. The strength and rigidity of the resin frame bodies 50 and 60 themselves are increased with a relatively simple structure without increasing the thickness of the sheets 50 and 60 and without increasing the overall thickness of the seat back frame 1. . Furthermore, since the bottoms of the reinforcing ribs 55 and 65 formed on the resin frame bodies 50 and 60 are joined to the opposing surface portions of the resin frame bodies 50 and 60, the above effects can be achieved with a relatively simple structure. Can be played more effectively.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications may be made within the scope of the claims.

  For example, the seat back frame 1 may be applied to a vehicle other than a wagon type vehicle or a hatch back type vehicle, for example, a sedan type vehicle. The seat back frame 1 may be applied to a seat other than a retractable rear seat, for example, a fixed front seat.

  Moreover, in each said embodiment, although the horizontal extension part 12b of the 2nd metal frame body 12 is bent and joined in the substantially up-down direction in the vicinity joined to the metal hinge member 4, it is resin frame. You may make it join to the metal hinge member 4 in the state which followed the lower side part of the body 20 substantially.

  Further, the resin frame body 20 and the like are not necessarily formed in a hollow shape, and a part or all of the frame body 20 may be solid. Moreover, you may manufacture by manufacturing methods other than blow molding.

  The resin frame body 20 of each of the embodiments described above includes the cushion material support portion 21a and the armrest placement portion 21b, but may include only the cushion material support portion 21a.

  The configuration of the retractor support bracket 80 or the like, or the configuration of the cross-sectional bent portion 20a or the like for supporting the shape may be in a form other than the first to fourth embodiments as long as the configuration is within the scope of claim 1. .

It is a perspective view of a seat back frame of a car seat concerning a 1st embodiment of the present invention. It is a front view of the seat back frame shown in FIG. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is the E section enlarged view of FIG. It is the III-III sectional view taken on the line of FIG. It is the perspective view of the structure which cut out a part of resin-made frame body and showed typically. It is the XI-XI sectional view taken on the line of FIG. It is the XII-XII sectional view taken on the line of FIG. It is a perspective view which shows typically a part of shaping die of a resin-made frame body. It is a fragmentary perspective view of the seat back frame of 2nd Embodiment which concerns on this invention. It is the IV-IV sectional view taken on the line of FIG. It is a fragmentary perspective view of the seat back frame of 3rd Embodiment concerning this invention. It is the VV sectional view taken on the line of FIG. It is a fragmentary perspective view of the seat back frame of 4th Embodiment concerning this invention. It is the VI-VI sectional view taken on the line of FIG. It is a fragmentary perspective view of the cross-sectional bending part in the resin-made frame bodies of 5th Embodiment concerning this invention. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a perspective view of the resin-made frame body of 6th Embodiment which concerns on this invention. It is the XIV-XIV sectional view taken on the line of FIG. It is the XV-XV sectional view taken on the line of FIG. It is a perspective view of the resin-made frame body of 7th Embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat back frame 1c Retractor attachment part 2 Support member 4 Metal hinge member 11 1st metal frame body 12 2nd metal frame body 15,45,55,65, Reinforcement rib 20,30,40,50,60 Resin Frame body 20a, 20b, 20c, 39 Folded section 21a Cushion material support section 29 Closed section section 71 Seat back 72 Headrest 80, 90, 93, 97 Retractor support bracket 85 Retractor 86 Seat belt

Claims (8)

A plate-like resin frame body provided with a cushion material support portion for supporting the back side of the cushion material of the seat back;
A metal hinge member provided at a lower end portion and a vehicle width direction end portion of the resin frame body and connecting the resin frame body to the vehicle side;
A first metal frame body that extends substantially along the upper side of the resin frame body over substantially the entire width of the resin frame body and to which a support member that supports the headrest is attached;
The resin frame body extends substantially vertically in the vehicle width direction intermediate region, and one end side is joined to the middle part of the first metal frame body in the vehicle width direction, while the other end side is the resin frame. A vehicle seat comprising: a second metal frame body extending to a substantially lower side portion of the body, extending substantially in the vehicle width direction along the lower side portion, and having the other end joined to the metal hinge member A back frame structure,
A retractor mounting portion for attaching a seat belt retractor is provided at a position spaced apart from the first metal frame body on the resin frame body,
Below the retractor mounting portion in the resin frame body, a cross-sectional bent portion is formed along a substantially vertical direction,
The retractor is attached to the retractor mounting part via a retractor support bracket, and the retractor support bracket is joined to the first metal frame body and the cross-section bent part. Seat back frame structure.   The vehicle seat back frame structure according to claim 1, wherein the resin frame body is formed to have a hollow shape.   The cross-sectional bent portion includes a closed cross-sectional portion formed independently of the cross-sectional bent portion, a projecting portion protruding inside the cross-section of the cross-sectional bent portion, and a protrusion protruding outside the cross-section of the cross-sectional bent portion. The vehicle seat back frame structure according to claim 2, comprising at least one of the shape portions. The resin frame body is integrally formed with a reinforcing rib having a concave cross section extending substantially in the vertical direction and entering the inner side of the hollow cross section in a portion other than the flat plate portion of the cushion material support portion,
4. The vehicle seat back frame structure according to claim 2, wherein a bottom surface portion of the reinforcing rib is joined to opposite surface portions of the resin frame body.   The vehicle seat back frame structure according to any one of claims 2 to 4, wherein the resin frame body is formed by a blow molding method.   6. The vehicle seat back frame structure according to claim 1, wherein the cross-sectional bent portion is formed substantially along a side end portion of the resin frame body.   The vehicle seat back frame structure according to any one of claims 1 to 6, wherein the retractor support bracket is disposed on the front side of the retractor in a state where the retractor is attached. .   The vehicle seat back frame structure according to any one of claims 1 to 7, wherein the seat back frame structure is applied to a rear seat of a wagon type vehicle or a hatch back type vehicle.

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