JP2015186993A - seat back structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back structure including a high strength fixing part which fixes a rotary mechanism to a resin seat back frame.SOLUTION: A fixing part for attaching a rotary mechanism 3 is provided at a seat back frame 1 of a seat back structure. The rotary mechanism 3 includes: a metal fastening member 35; and a metal fixing member 30 which engages with the fastening member 35. The structure has a block shaped member 20 formed by embedding a metal fastened member 27, to which the fastening member 35 may be fastened, in a resin material. The block shaped member 20 is disposed between a resin front panel 11 and a resin rear panel 13 and is fastened to at least one of the panels 11, 13. The fixing member 30 is connected with the block shaped member 20 in a state where the fastening member 35 is fastened to the fastened member 27.

Description

  The present invention relates to a vehicle seat back structure including a resin seat back frame.

  The vehicle seat includes a seat cushion on which an occupant is seated and a seat back that supports an upper limb of the occupant. The current seat back frame is made of a metal panel material or pipe material. The panel member or the pipe member is provided with a fixing portion for fixing a rotation mechanism such as a hinge mechanism or a reclining mechanism. This fixed part is a part for which high strength is required. As for the structure of the fixing portion, for example, a bracket or a reinforcing member to which a nut or the like is welded is fixed to a pipe material or the like of the seat back frame by welding.

  Even when the seat back frame is changed from metal to resin to reduce weight, etc., the pivot mechanism such as the hinge mechanism and reclining mechanism must be made of metal as usual to ensure strength. There is. In order to fix the metal rotation mechanism with a fastening member such as a bolt, it is necessary to fix a metal nut serving as a receiving side for the fastening member such as a bolt on the seat back frame side.

  However, in the joining of dissimilar materials of resin and metal, welding cannot be performed like metals, so it is necessary to use a method other than welding in order to fix a metal nut or the like to a resin seat back frame. is there. Examples of vehicle seats having a resin seat back frame are disclosed in Patent Documents 1 to 3, for example.

Japanese Patent No. 5211595 JP 2003-182417 A JP 2009-204159 A

  However, in the example disclosed in Patent Document 1, the fixing portion of the hinge has a flat plate shape and has a low cross section so that the strength is low. When a heavy load is applied in a strength test or the like, the hinge fastening part may be broken or greatly deformed. In the example disclosed in Patent Document 2, in order to melt the thermoplastic composite material when overmolding the hinge and shape it by air pressure, the mold is set to a high temperature of, for example, about 235 ° C. and high pressure air is used. (About 8 to 12 bar) must be supplied to form the attachment part of the hinge part, and the production process is complicated.

  In the example disclosed in Patent Document 3, since an adhesive is used, it takes time to cure. In addition, when heated to accelerate curing, the working environment may be deteriorated due to gas generation at high temperatures. In addition, the position of the part may not be stable until the adhesive is cured.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a seat back structure including a high-strength fixing portion that fixes a metal rotation mechanism to a resin seat back frame. It is to be.

  In order to achieve the above object, a seat back structure according to the present invention has a seat back rotating mechanism on a seat back frame having a resin front panel and a resin rear panel disposed behind the front panel of the vehicle. It is an attached structure. The rotation mechanism includes a metal fastening member and a metal fixing member engaged with the fastening member. The seat back structure includes a block-like member in which a metal fastening member is embedded in a resin material, and the fixing member is the block-like member when the fastening member is fastened to the fastening member. The block-like member is disposed between the front panel and the rear panel, and is configured to be fixed to at least one of the front panel and the rear panel.

  In the aspect of the seat back structure according to the present invention, the fastening member extends between the front panel and the rear panel, and the fastening member is disposed on each of the front panel side and the rear panel side. The first fastening member disposed on one side of the front panel side and the rear panel side among the fastening members is provided at one longitudinal end of the fastened member. The first fastening portion is fastened, and the first fastening portion protrudes from the surface of the block-like member and is disposed so as to pass through a hole provided in the panel to be welded.

  In the aspect of the seat back structure according to the present invention, the second fastening member disposed on a side different from the side on which the first fastening member is disposed is provided on the other side of the fastened member. A second fastening portion provided at an end in the longitudinal direction is fastened, and the second fastening portion is located inside the block-shaped member, and the second fastening member and the front panel or the rear panel Are in contact.

  In one aspect of the seat back structure according to the present invention, the block-like member is vibration welded to at least one of the front panel and the rear panel.

  In one aspect of the seat back structure according to the present invention, the block-like member is provided with a front welding surface that is vibration welded to the front panel and a rear welding surface that is vibration welded to the rear panel, When the front welding surface is welded to the front panel in a state where the rear welding surface is vibration welded to the rear panel, a convex portion that protrudes toward the front panel is provided on the front welding surface. It has been. When the rear welding surface is welded to the rear panel in a state where the front welding surface is vibration welded to the front panel, a convex portion that protrudes toward the rear panel is provided on the rear welding surface. ing.

  Further, in one aspect of the seat back structure according to the present invention, the fastened member extends between the front panel and the rear panel, and the convex portion is in a longitudinal direction of the fastened member. And is configured to surround from the outside in the radial direction.

  In one aspect of the seat back structure according to the present invention, the front panel is vibration welded to the front welding surface and vibration welded to the rear panel in a state where the rear welding surface is vibration welded to the rear panel. It is configured as follows. Further, in a state where the front welding surface is vibration welded to the front panel, the rear panel is vibration welded to the rear welding surface and vibration welded to the front panel.

  In the aspect of the seat back structure according to the present invention, the fastened member extends between the front panel and the rear panel, and the block member has a longitudinal direction of the fastened member. A surrounding portion is provided from the outside in the radial direction, and at least one of the recessed portion recessed in the longitudinal direction and the through-hole penetrating in the longitudinal direction is provided on the radially outer side of the surrounding portion and inside the corner portion. Is provided.

  According to the present invention, it is possible to fix a metal fixing member to a resin seat back frame and to obtain a high strength at a portion where strength is required by providing a block-shaped member. Become. Further, by adopting a block shape, it is possible to secure a fixed area of the seat back frame to the front panel or the rear panel, and further improve the accuracy of the installation position.

  In addition, according to one aspect of the present invention, since the fastening member and the member to be fastened can be fastened without being in contact with the panel, a creep phenomenon caused by contact between the resin material and the metal fastening member, etc. And electric corrosion can be prevented, and further, a decrease in fastening force of the fastening portion can be suppressed.

  In addition, according to one aspect of the present invention, since one panel and the second fastening member can be directly fastened, the front panel and the rear panel can be firmly fastened. As a result, the strength in the vicinity of the hinge can be improved. For example, the seat back frame in the vicinity of the hinge may be damaged even in the vicinity of the hinge where a strong stress is easily applied when the vehicle collides. Can be reduced.

  If the block member and the resin panel are fixed with an adhesive or the like, it takes time to cure. On the other hand, according to one aspect of the present invention, the fixing time is shortened because the fixing is performed by vibration welding. Furthermore, it is possible to improve the accuracy of the position dimension of the fastened member to be fastened.

  When the block-like member is welded to each panel, the block-like member is fixed to one panel and then fixed to the other panel. Here, when the panel to be welded later and the block member are fixed, it is necessary to simultaneously make contact with one panel already fixed to the block member and the other panel to be fixed. Therefore, there is a possibility that a sufficient contact surface between the block-shaped member and the panel to be welded later cannot be secured. On the other hand, according to one aspect of the present invention, by providing the convex portion on the welding surface of the block-like member to be welded later, energy can be efficiently transmitted with a small amount of contact surface. It becomes possible to perform welding reliably. Furthermore, since the block-like member can be firmly fixed to both the front panel and the rear panel, the strength of the fixing portion can be ensured.

  In addition, according to one aspect of the present invention, the fixing portion to the panel (the tip of the convex portion) is disposed so as to surround the periphery of the member to be fastened, so that the strength around the fastening portion can be increased.

  Further, according to one aspect of the present invention, since the welding of the block-shaped member and the panel to be welded later can be performed simultaneously with the welding of the rear panel and the front panel, the number of man-hours can be reduced.

  Further, according to one aspect of the present invention, the resin is left around the corner portion serving as a positioning reference and the fastened portion to which a load is applied, thereby reducing the weight while securing the strength and the dimensional accuracy of the fixed position. It becomes possible.

1 is a schematic perspective view showing a seat back frame of a seat back structure according to a first embodiment of the present invention. It is an expansion perspective view which expands and shows the lower part of the vehicle width direction end of the seat back frame of FIG. It is AA arrow sectional drawing of FIG. It is a perspective view which shows the foamed nut of FIG. 3 alone. FIG. 4 is a perspective view showing a state where a block-like member is attached to the rear panel of FIG. 3. It is a perspective view which shows the state which welded the block-shaped member to the rear panel of FIG. It is a perspective view which shows the state which welded the front panel to the rear panel of FIG. FIG. 8 is an enlarged perspective view of a portion X (near the fixed portion) of FIG. It is a perspective view which shows the state which connected the hinge board to the fixing | fixed part of FIG. It is a perspective view which shows the modification of the block-shaped member of FIG. It is sectional drawing which shows a part of seat back structure of 2nd Embodiment which concerns on this invention. It is sectional drawing which shows the modification of embodiment of FIG. It is sectional drawing which shows the modification of the seat back structure which concerns on this invention. It is a perspective view which shows the modification of the formed nut of FIG.

  Hereinafter, an embodiment of a seat back structure according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, a first embodiment of a seat back structure according to the present invention will be described with reference to FIGS. The seat back frame 1 of the present embodiment is provided with a fixing portion 2 for attaching a seat back rotating mechanism 3. The rotation mechanism 3 includes a reclining mechanism and the like. The seat back in this example describes a seat back of a rear seat for a vehicle. Further, as shown in FIG. 1, the rear seat of this example is of a type divided into left and right. The length of the divided seats in the vehicle width direction is larger on the right seat than on the left seat when viewed from the rear of the vehicle.

  The rotation mechanism 3 includes a first metal fastening member (rear bolt 35) and a metal fixing member (in this example, the hinge plate 30) that engages with the rear bolt 35. The hinge plate 30 is attached to the fixed portion 2 by a rear bolt 35. Here, the hinge board 30 is attached to the fixing | fixed part 2 provided in the right-and-left both sides of the sheet | seat of the right side in FIG. 1 among division sheets (FIG. 1, FIG. 2). The attachment to the fixed part 2 will be described later.

  The seat back frame 1 includes a resin front panel 11 and a resin rear panel 13 disposed at a distance behind the front panel 11 in the vehicle. The front panel 11 and the rear panel 13 are substantially rectangular plate-like members. Here, each panel is formed of a fiber reinforced resin material such as CFRP (Carbon fiber reinforced plastics). As a matrix resin of a fiber reinforced resin, it can be formed using various thermoplastic resins such as PP, PA6, PA12, PA66, PEEK, PC, and PET.

  As shown in FIG. 3, the front panel 11 is provided with a through hole 11a. A formed nut 27 described later is disposed in the through hole 11a. Further, the rear panel 13 is provided with a through hole 13a similarly to the front panel 11, and the vehicle rear portion of the formed nut 27 passes through the through hole 13a.

  The fixed portion 2 has a block-shaped member 20 in which a metal formed nut 27 to which the rear bolt 35 can be fastened is embedded in a resin material, for example, fiber-reinforced PA resin. The formed nut 27 is a cylindrical member formed so as to extend between the front panel 11 and the rear panel 13, and a thread groove is formed in the entire longitudinal direction inside the cylinder. The formed nut 27 and the rear bolt 35 are fastened by screwing the rear bolt 35 into the thread groove. Note that the thread groove does not have to be the entire region, and it is sufficient if there are thread grooves of a predetermined length at both ends. Of the thread grooves in this example, the thread groove on the rear side of the vehicle is a rear side fastening part (first fastening part) 27b described later, and the thread groove on the front side of the vehicle is a front side fastening part (second fastening part) described later. 27e.

  As shown in FIGS. 3 to 5, a flange 27 a projecting outward in the radial direction is provided slightly rearward from the longitudinal center of the formed nut 27. The outer diameter of the cylindrical portion on the front side of the vehicle from the flange 27a is smaller than the outer diameter on the rear side of the flange 27a. The inner diameter of the formed nut 27 is formed with the same diameter over the vehicle longitudinal direction. The formed nut 27 protrudes forward and rearward of the block-shaped member 20 in the vehicle. The flange 27 a is embedded in the resin material of the block-shaped member 20. In this example, the formed nut 27 is insert-molded with a resin material.

  As shown in FIGS. 1, 3, and 5, the block-like member 20 is disposed between the front panel 11 and the rear panel 13, and below the panels 11 and 13. Further, one block-like member 20 is arranged on each of both sides in the vehicle width direction. A front welding surface 21 welded to the vehicle rear surface of the front panel 11 is provided on the vehicle front side of the block-shaped member 20, and a rear welding surface 25 welded to the vehicle front surface of the rear panel 13 on the vehicle rear side of the block member. Is provided. The block-shaped member 20 has a front welding surface 21 and a front panel 11 welded, and a rear welding surface 25 and a rear panel 13 welded. That is, the block member is welded to the panels 11 and 13 on both sides while being sandwiched between the panels. In the present embodiment, the welding surfaces 21 and 25 of the block-shaped member 20 are vibration welded to the panels 11 and 13.

  Here, vibration welding refers to welding by causing a reciprocating motion of a predetermined frequency and amplitude to act on one resin material in a state where the resin material is sufficiently pressurized, and generating frictional heat on the contact surface. .

  As shown in FIG. 3, the formed nut 27 projects forward from the front welding surface 21 and projects rearward from the rear welding surface 25. The tip of the portion of the formed nut 27 that protrudes forward (front tip 27 c) passes through the through hole 11 a of the front panel 11. On the other hand, the front end (rear front end 27d) of the portion protruding rearward protrudes rearward from the through hole 13a of the rear panel 13.

  The outer shape of the block-shaped member 20 is formed so that a part of the rectangular parallelepiped is cut out. As shown in FIG. 5, one place is cut out in each of the vehicle vertical directions, and one place inside the vehicle width direction is cut out. The corner is in a state where the resin material remains without being cut out. As shown in FIG. 3, a flat rear welding surface 25 is formed at the vehicle rear portion of the block-shaped member 20.

  Further, a concave portion that is recessed toward the rear of the vehicle is formed in the front portion of the block-shaped member 20. The concave portion has a meat stealing shape for weight reduction. In this example, two concave portions, that is, a first concave portion 24a and a second concave portion 24b are provided. Further, an enclosure 22a that surrounds the formed nut 27 from the outside in the radial direction by a resin material is provided at the vehicle front portion of the block-shaped member 20.

  The first concave portion 24a is formed on the outer side in the radial direction of the surrounding portion 22a. A resin portion 22b is provided on the radially outer side of the first concave portion 24a. The vehicle upper portion of the resin portion 22b extends in the vehicle width direction. The lower part of the vehicle also extends in the vehicle width direction. Further, the resin portion 22b is formed so as to connect the upper and lower portions of the vehicle extending in the vehicle width direction with an arc on the inner side in the vehicle width direction.

  The second concave portion 24b is formed on the radially outer side of the resin portion 22b. The outermost resin part 22c which comprises the exterior of the lock-shaped member of a part is provided in the outer side of the 2nd recessed shape part 24b. That is, the vehicle front portion of the block-shaped member 20 has an enclosure 22a, a first concave portion 24a, a resin portion 22b, and a second concave portion 24b from the formed nut 27 toward the outside as viewed from the front of the vehicle. The outermost resin portion 22c including the corner portion. A through hole 24c is formed on the inner side of the outermost resin portion 22c in the vehicle width direction and on the vehicle, and a through hole 24d is formed on the inner side of the outermost resin portion 22c in the vehicle width direction and on the lower side of the vehicle. As described above, the corners of the block-shaped member 20 are in a state where the resin material is left.

  Here, other than the concave shaped portions 24 a and 24 b and the through holes 24 c and 24 d, that is, the vehicle front ends of the resin portion 22 b and the outermost resin portion 22 c that are not recessed become the front welding surface 21. The front welding surface 21 is provided with a convex portion (energy director) 23 that protrudes forward of the vehicle. In this example, the convex portion 23 has a triangular cross section and a pointed front end of the vehicle, and surrounds the formed nut 27 from the outside in the radial direction when the longitudinal direction of the formed nut 27 is the center. Is provided.

  In the present embodiment, the block-shaped member 20 is provided with the concave portions 24a and 24b, but may be solid. As a modification, as shown in FIG. 10, a rectangular parallelepiped shape without a notch may be used.

  Then, the hinge board 30 which comprises the rotation mechanism 3 is demonstrated. As shown in FIGS. 2 and 9, the hinge plate 30 is a member in which a rectangular plate member is bent at a substantially right angle. One surface, which is closed with the bent portion 33 as a boundary, abuts the formed nut 27 in a state of facing the vehicle rear surface of the rear panel 13 with an interval 40 therebetween. At this time, the bent portion 33 of the hinge plate 30 extends along the vehicle width direction edge of the rear panel 13, and the portion that does not contact the formed nut 27 extends from the bent portion 33 to the front of the vehicle. ing. As shown in FIG. 3, a through hole 30 a is provided on the surface of the hinge plate 30 that contacts the formed nut 27. As shown in FIG. 2, a through hole 30 b is also provided in a portion extending forward from the bent portion 33 to the vehicle.

  A procedure for welding the block-shaped member 20 to the panels 11 and 13 will be described. First, as shown in FIG. 6, the rear welding surface 25 of the block-like member 20 is welded to the vehicle front surface of the rear panel 13 by vibration welding. At this time, as shown in FIG. 3, the rear end 27 d of the formed nut 27 protrudes from the through hole 13 a of the rear panel 13 toward the rear of the vehicle. Further, the edge of the rear tip 27d is arranged so as to keep a distance from the inner periphery of the through hole 13a.

  Next, as shown in FIGS. 7 and 8, the front welding surface 21 of the block-like member 20 is welded to the vehicle rear surface of the front panel 11. At this time, the vehicle rear surface of the front panel 11 and the vehicle front surface of the rear panel 13 are welded. Here, as shown in FIG. 3, the front end 27 c of the formed nut 27 projects from the through hole 11 a of the front panel 11 toward the front of the vehicle. Further, the surrounding portion 22a surrounding the front tip 27c is arranged so as to keep a space with respect to the inner periphery of the through hole 11a.

  Further, as shown in FIG. 9, a front bolt (second fastening member) 37 is fastened to the front side of the formed nut 27 from the front surface of the front panel 11 with a washer 38 interposed therebetween. The part 27e is screwed. At this time, the washer 38 comes into contact with the front end 27c of the formed nut 27, so-called metal touch.

  Further, as shown in FIG. 3, the hinge plate 30 is brought into contact with the formed nut 27 in a state where the rear bolt 35 penetrates the through hole 30 a formed on the surface of the hinge plate 30 facing the rear panel 13. At this time, the edge of the through hole 30a of the hinge plate 30 contacts the rear end 27d of the formed nut 27, and the bolt head of the rear bolt 35 contacts the edge. This is also a so-called metal touch state, and the hinge plate 30 and the rear panel 13 are in a state where a space 40 is left therebetween. In this state, the rear bolt 35 and the formed nut 27 are fastened together, and as a result, the hinge plate 30 is connected to the block-shaped member 20 with the rear panel 13 interposed.

  As can be seen from the above description, according to the seat back structure of the present embodiment, the metal hinge plate 30 can be fixed to the resin seat back frame 1 and the block-like member 20 is provided. It is possible to obtain high strength at a portion where strength is required. Furthermore, by making the shape of the fixing portion 2 into a block shape, it is possible to secure an area where the seat back frame 1 is fixed to the front panel 11 and the rear panel 13, and further improve the accuracy of the installation position. Furthermore, according to the present embodiment, the following effects can be obtained.

  When a load is applied to the resin material, a creep phenomenon in which deformation increases with time may occur, and loosening of the fastening portion may occur. Further, when the seat back panel is made of CFRP, the carbon fiber contained in the CFRP and the metal part come into contact with each other, which may cause electrolytic corrosion and reduce the fastening force of the fastening portion. On the other hand, according to this embodiment, since the tip 27d of the formed nut 27 is disposed in the through hole 13a of the rear panel 13, the formed nut 27 and the rear bolt 35 are not in contact with the rear panel 13. It becomes possible to conclude. For this reason, it becomes possible to prevent the creep phenomenon and the electric corrosion caused by the resin material and the metal fastening member etc. coming into contact with each other, and further to suppress the lowering of the fastening force of the rear side fastening portion 27b.

  Further, if the block-like member 20 and the panels 11 and 13 are fixed with an adhesive or the like, it takes time to cure. On the other hand, according to this embodiment, since it adheres by vibration welding, the adhering time can be shortened. Furthermore, it is possible to improve the accuracy of the position dimension of the fastened member to be fastened.

  Further, when the block-like member 20 is welded to each of the panels 11 and 13, it is fixed to the front panel 11 after being fixed to the rear panel 13. Here, when the front panel 11 and the block-shaped member 20 are fixed, the rear panel 13 and the front panel 11 must be contacted at the same time. For this reason, there is a possibility that a sufficient contact surface between the block-shaped member 20 and the front panel 11 cannot be secured.

  On the other hand, according to this embodiment, by providing the convex-shaped part (energy director) 23 on the front welding surface 21 of the block-shaped member 20, energy can be efficiently transmitted with a small contact surface, and welding is performed. Can be reliably performed. Furthermore, since the block-like member 20 can be firmly fixed to both the front panel 11 and the rear panel 13, the strength of the fixing portion 2 can be ensured. Moreover, since the convex-shaped part 23 is provided so that the circumference | surroundings of the formed nut 27 may be enclosed, the intensity | strength of the circumference | surroundings of the front side fastening part 27e and the rear side fastening part 27b can be raised.

  Further, according to the present embodiment, the welding of the block-shaped member 20 and the front panel 11 can be performed simultaneously with the welding of the rear panel 13 and the front panel 11, so that the number of man-hours can be reduced. In addition, according to the present embodiment, the corner portion serving as a positioning reference and the resin portion (enclosure 22a) are left around the formed nut 27 to which a load is applied, while ensuring strength and fixing position dimensional accuracy. It becomes possible to reduce the weight.

[Second Embodiment]
Next, a second embodiment of the seat back structure according to the present invention will be described with reference to FIGS. In addition, this embodiment is a modification of 1st Embodiment (FIGS. 1-10), Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is carried out. Omitted. In the present embodiment, for example, an example will be described in which it is not necessary to consider electrolytic corrosion, that is, when the electrolytic solution does not adhere or the panel material is a non-conductive material.

  In the seat back structure of the present embodiment, the front bolt (second fastening member) 37 is fastened to a thread groove (front fastening portion 27 e) provided in the vehicle front portion of the formed nut 27. The front side fastening portion 27 e is located inside the block-shaped member 20. That is, the vehicle front end of the front side fastening portion 27 e is disposed behind the vehicle front surface of the block-shaped member 20. In this example, the front bolt 37 is in contact with the vehicle front surface of the front panel 11 with a metal washer 38 interposed therebetween.

  With such a configuration, the front panel 11 and the second fastening member (in this example, the front bolt 37 and the washer 38) are directly in contact with each other, so that the front panel 11 and the rear panel 13 are fastened. Can be firmly fastened. As a result, the strength in the vicinity of the hinge can be improved. For example, the seat back frame 1 in the vicinity of the hinge may be damaged even in the vicinity of the hinge where a strong stress is easily applied when the vehicle collides. Can be reduced. In addition, an adhesive may be used in combination since the axial force may decrease due to the creep phenomenon and looseness may occur during bonding.

  As a modification, as shown in FIG. 12, the formed nut 27 is protruded rearward from the vehicle rear side of the block-shaped member 20, and the hinge plate 30 is sandwiched and fixed by the formed nut 27 and the rear bolt 35. On the other hand, on the vehicle front side, the front panel 11 and the vehicle front surface of the block-shaped member 20 may be welded without providing the formed nut 27, the front bolt 37, and the like. In the example of FIG. 12, there is no part ahead of the vehicle with respect to the flange 27a of the formed nut 27 described in the present embodiment or the first embodiment. Also, as shown in FIG. 12, instead of the washer 38, a thick portion 11b in which the thickness of the welding position of the front panel 11 is partially increased is provided so that the same strength as in this embodiment can be obtained. May be.

  Further, although not shown in FIG. 12, the front welding surface 21 of the block-shaped member 20 may be provided with a plurality of convex portions protruding to the front of the vehicle. These convex portions have the same functions as the convex portions 23 described in the first embodiment (FIG. 5). As an example of the plurality of convex-shaped portions, each of the convex-shaped portions may extend in the vehicle width direction and be arranged with a space therebetween in the vehicle vertical direction. Moreover, you may arrange | position each convex-shaped part concentrically. In this case, the convex portion has a plurality of circular shapes with different radii. 12 illustrates an example in which the hinge plate 30 is attached to the rear panel 13. However, the present invention is not limited to this, and the hinge plate 30 may be attached to the front panel 11.

  Moreover, the shape of the welding surface of the block-shaped member 20 may be a polygon or a circle, or may be a combination of a polygon and a circle. In addition, when stress is applied to the corners of the block-shaped member 20 and the welding between the front panel 11 or the rear panel 13 and the block-shaped member 20 may be peeled off, the stress applied to the end portions is dispersed. The block-shaped member 20 is preferably circular.

[Other Embodiments]
The descriptions of the first and second embodiments are examples for explaining the present invention, and do not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

  For example, in the above-described embodiment, the formed nut 27 is embedded in the block-shaped member 20, but the present invention is not limited to this. You may embed the penetration volt | bolt 50 provided with the thread part in the part which protrudes from the block-shaped member 20. FIG. As shown in FIG. 13, a through bolt 50 may be used as a member to be fastened, and a rear nut 51 and a front nut 52 may be used as a first fastening member and a second fastening member, respectively. In the example shown in FIG. 13, the through bolt 50 is disposed so as to penetrate the block-shaped member 20 in the vehicle front-rear direction and protrude from the block-shaped member 20 in the vehicle front-rear direction. The through bolt 50 is provided with a rear flange 50c that contacts the hinge plate 30 on the rear panel 13 side and a front flange 50d that contacts the washer 38 on the front panel 11 side. These flanges 50 c and 50 d are formed so as to protrude in the radial direction of the through bolt 50.

  A threaded portion (fastening portion) is provided at a portion of the through bolt 50 protruding from the block-like member 20. In this example, the rear nut 51 is attached to the screw portion 50a (first fastening portion) on the vehicle rear side, and the front nut 52 is attached to the screw portion 50b (second fastening portion) on the vehicle front portion. It has been. The hinge plate 30 is sandwiched and fixed by the rear flange 50 c of the through bolt 50 and the rear nut 51.

  In the above embodiment, the block-like member 20 is welded to both the rear panel 13 and the front panel 11, but this is not a limitation, and the block-like member 20 may be welded to only one panel.

  Moreover, although the convex-shaped part 23 is provided in the front welding surface 21 of the block-shaped member 20, it is not restricted to this. You may provide in the rear welding surface 25. FIG. When the convex portion 23 is provided on the rear welding surface 25, the block-like member 20 may be assembled to be welded to the rear panel 13 after being welded to the front panel 11.

  Furthermore, as a modification of FIG. 4, as shown in FIG. 14, a part of the flange of the formed nut may be cut out. In this example, notches 27f are provided at two locations on the end of the flange. Each notch 27f is disposed at a position facing each other, and ends of the notch 27f extend in parallel to each other. By providing the notch portion 27f in this manner, the resin material constituting the block-shaped member 20 flows into the notch portion 27f and can be insert-molded. As a result, it is possible to prevent the notched portion 27f from becoming a resistance at the time of fastening and rotating the formed nut 27. In the example of FIG. 14, the notches 27f extend in parallel to each other, but the present invention is not limited to this. Since it may be formed so as to prevent the rotation of the formed nut 27, for example, the notches 27f may form a predetermined angle with each other. It is also possible to curve without extending linearly.

  The material of the block-shaped member 20 is a fiber reinforced PA resin, but is not limited thereto. Since it only needs to be able to be welded to the panels 11 and 13, it is desirable to be formed of the same material as the panels 11 and 13. The welding here includes vibration welding, hot plate welding, ultrasonic welding, and the like. Moreover, each panel 11 and 13 is not restricted to CFRP, and the block-like member 20 should just be what can be welded similarly to the above. For example, thermoplastic fiber reinforced resins such as glass fiber, aramid fiber, and organic fiber may be used. Moreover, it is possible to combine the modified example mentioned above according to a use aspect.

DESCRIPTION OF SYMBOLS 1 Seat back frame 11 Front panel 11a Through-hole 11b Thick part 13 Rear panel 13a Through-hole 2 Fixing part 20 Block-shaped member 21 Front welding surface 22a Enclosure 22b Resin part 22c Outermost resin part 23 Convex-shaped part 24a 1st recessed part Shaped part 24b Second concave shaped part 24c Through hole 24d Through hole 25 Rear welding surface 27 Formed nut (fastened member)
27a Flange 27b Rear side fastening part (first fastening part)
27c Front tip 27d Back tip 27e Front fastening portion (second fastening portion)
27f Notch 3 Rotating mechanism 30 Hinge plate (fixing member)
30a Through hole 30b Through hole 33 Bent part 35 Rear bolt (first fastening member)
37 Front bolt (second fastening member)
38 Washer 40 Interval 50 Through-bolt (fastened member)
50a Screw part (first fastening part)
50b Screw part (second fastening part)
50c Rear flange 50d Front flange 51 Rear nut (first fastening member)
52 Front nut (second fastening member)

Claims (8)

A seat back rotation mechanism is attached to a seat back frame having a resin front panel and a resin rear panel disposed behind the front panel of the vehicle, wherein the rotation mechanism is a metal In a seat back structure having a fastening member made of metal and a metal fixing member engaged with the fastening member,
A block-shaped member in which at least a part of a metal member to be fastened is embedded in a resin material, and when the fastening member is fastened to the member to be fastened, the fixing member is connected to the block-like member. And
The seat-back structure, wherein the block-shaped member is disposed between the front panel and the rear panel and is fixed to at least one of the front panel and the rear panel. The fastened member extends between the front panel and the rear panel, and the fastening member is disposed on each of the front panel side and the rear panel side,
Among the fastening members, a first fastening member disposed on one side of the front panel side and the rear panel side includes a first fastening member provided at one longitudinal end of the fastened member. The fastening part is fastened,
2. The seat back according to claim 1, wherein the first fastening portion protrudes from a surface of the block-like member and is disposed so as to penetrate a hole provided in a panel to be welded. Construction. The second fastening member disposed on the side different from the side on which the first fastening member is disposed has a second fastening portion provided at the other longitudinal end of the member to be fastened. Has been
The seat back according to claim 2, wherein the second fastening portion is located inside the block-like member, and the second fastening member and the front panel or the rear panel are in contact with each other. Construction.   The seat back structure according to any one of claims 1 to 3, wherein the block-shaped member is vibration welded to at least one of the front panel and the rear panel. The block-shaped member is provided with a front welding surface that is vibration welded to the front panel and a rear welding surface that is vibration welded to the rear panel,
When the front welding surface is welded to the front panel in a state where the rear welding surface is vibration welded to the rear panel, a convex portion that protrudes toward the front panel is provided on the front welding surface. And
When the rear welding surface is welded to the rear panel in a state where the front welding surface is vibration welded to the front panel, a convex portion that protrudes toward the rear panel is provided on the rear welding surface. The seat back structure according to claim 4, wherein the seat back structure is provided. The fastened member extends between the front panel and the rear panel,
The seat back structure according to claim 5, wherein the convex shape portion is configured to surround from a radially outer side with respect to a longitudinal direction of the fastened member. In the state where the rear welding surface is vibration welded to the rear panel, the front panel is configured to be vibration welded to the front welding surface and vibration welded to the rear panel,
The configuration is such that, in a state where the front welding surface is vibration welded to the front panel, the rear panel is vibration welded to the rear welding surface and vibration welded to the front panel. The seat back structure according to any one of claims 4 to 6. The fastened member extends between the front panel and the rear panel,
The block member is provided with a surrounding portion that is surrounded from the outside in the radial direction with respect to the longitudinal direction of the member to be fastened, and a concave shape that is recessed in the longitudinal direction on the radially outer side of the surrounding portion and inside the corner portion. The seat back structure according to any one of claims 1 to 7, wherein at least one of the portion and the through hole penetrating in the longitudinal direction is provided.

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