JP2019214228A - Vehicle seat - Google Patents

Abstract

To provide a seat frame of a vehicle seat which is configured to be light-weight and have high rigidity with the use of relatively inexpensive materials.SOLUTION: The vehicle seat includes a seat cushion and a seat back. The seat back includes a seat back side frames, a metallic lower frame connecting to the seat back side frames, and an urethane pad having a surface covered with skins. The seat back side frame is formed, by combining plural components injection-molded with fiber-reinforced resin internally including short fiber, such that the inside has a hollow portion. Of the plural components configuring the seat back side frames, the component connecting to the metallic lower frame is structured such that a portion thereof connecting to the metallic lower frame has a cross-section with a small thickness and a long vertical length compared with a cross-section of a portion of the seat back side frame, which is located on the same level as the position of the shoulder of an occupant seated on the seat.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat having a seat frame formed of resin.

  As a conventional example of a vehicle seat having a seat frame formed of a resin, Patent Literature 1 describes a vehicle seat provided with a shell-type seat frame manufactured of a composite resin material.

  In Patent Document 1, a vehicle seat is provided with a back pad as a cushion material for supporting an occupant in an outer shape of the seat, and a back pan made of fiber reinforced resin as a skeleton for supporting the back pad from the back side. Configuration is described.

  The back pan is attached with reinforcing members each having an open back pan side in the back region and the shoulder region, and the reinforcing members attached to the back region and the shoulder region are also formed of fiber reinforced resin. Have been.

  Further, in Patent Document 2, the frame of the sheet has a closed cross-sectional structure composed of an inner frame member and an outer frame member made of a resin material such as carbon fiber reinforced resin, and the inner frame member and the outer frame member made of the resin There is described a configuration in which the gap between the bonding surfaces can be kept constant, and the inner frame member and the outer frame member made of resin are bonded by filling the gap with an adhesive.

JP 2017-10017 A JP-A-2014-65341

  As a fiber-reinforced resin for forming a back pan and a reinforcing member attached to a back region and a shoulder region described in Patent Literature 1, three to six fibers woven with carbon fiber are superposed and an epoxy resin is used as a matrix resin. The composite which is impregnated and solidified is used.

  The fiber reinforced resin described in Patent Document 1 has a high material cost and is a bottleneck in reducing the cost of a vehicle seat. Further, in the configuration described in Patent Literature 1, since the reinforcing member is attached to the back region and the shoulder region of the back pan, it may be an obstacle in reducing the weight of the vehicle seat. There is.

  Further, in a seat frame having a closed cross-sectional structure formed by an inner frame member and an outer frame member described in Patent Literature 2, a portion near the lower cover and near the waist of the occupant and a lower cover are used. A configuration is shown in which the height of the closed cross-sectional structure formed by the inner frame member and the outer frame member is different between a portion near the shoulder of the distant occupant and the height.

  However, in the configuration described in Patent Literature 2, the thickness of the inner frame member and the thickness of the outer frame member are each constant, and the height of the closed cross-sectional structure in which the rigidity is reduced is close to the shoulder of the occupant. The inner frame member and the outer frame member are formed in such a thickness that sufficient rigidity can be ensured also in the portion. When the thickness of the inner frame member and the outer frame member is determined based on this portion, the inner frame member and the outer frame member are located at a portion close to the occupant's waist near the lower cover where the height of the closed sectional structure is high. The thickness with the member becomes excessive. This poses a problem from the viewpoint of reducing the weight of the seat frame.

  Further, Patent Literature 2 discloses a configuration in which the lower cover is also formed of a fiber reinforced resin and a convex bead extending to the left and right is formed, but the lower cover is not broken even when a large impact load is applied to the lower cover. There is a problem from the viewpoint of providing sufficient rigidity.

  An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a vehicle seat provided with a lightweight and highly rigid seat frame using a relatively inexpensive material.

  In order to solve the above-described problems in the related art, according to the present invention, in a vehicle seat including a seat cushion and a seat back, a seat back includes a seat back side frame and a metal made of metal connected to the seat back side frame. Equipped with a lower frame and a urethane pad whose surface is covered with a skin, and the seat back side frame has a hollow inside by combining a plurality of parts molded by injection molding using a fiber reinforced resin containing short fibers inside. The cross section of the portion formed and connected to the metal lower frame of the seat back side frame is higher than the cross section of the seat back side frame in a portion corresponding to the height of the occupant's shoulder when the occupant is seated. It is characterized in that the dimension in the vertical direction is large.

  According to the present invention, in order to solve the above-described problems in the related art, in a vehicle seat including a seat cushion and a seat back, the seat back is connected to the seat back side frame and the seat back side frame. It has a metal lower frame and a urethane pad whose surface is covered with skin, the metal lower arm has a pair of left and right metal brackets, and the seat back side frame is a fiber reinforced resin containing a single fiber inside. By combining a plurality of parts molded by injection molding, the inside is formed in an annular shape having a hollow interior and openings at both ends, and one of a pair of left and right metal brackets near the opening at one end of the annular shape It is configured to be connected to the other of the pair of left and right metal brackets near the opening at the other end of the ring.

  According to the present invention, it is possible to form a seat back side frame having high strength and high rigidity by injection molding, so that a plurality of carbon fiber woven fabrics are stacked and impregnated and solidified with an epoxy resin. Compared with the prior art, the material cost can be significantly reduced.

  Further, according to the present invention, the manufacturing process of the seat back side frame is simplified as compared with the related art, so that the manufacturing cost can be reduced.

  Further, according to the present invention, the number of parts of the seat back can be reduced, so that the weight of the seat back can be reduced.

1 is a perspective view illustrating an appearance of a vehicle seat according to a first embodiment of the present invention. FIG. 1 is a perspective view showing an appearance of a frame in a state where a skin and a urethane pad are removed from a vehicle seat according to a first embodiment of the present invention. It is a perspective view showing the state where the frame at the seat back side of the vehicular seat concerning Example 1 of the present invention was disassembled. FIG. 3 is a cross-sectional view of the frame on the seatback side of the vehicle seat according to the first embodiment of the present invention, taken along the line AA in FIG. 2. FIG. 3 is a cross-sectional view of the frame on the seat back side of the vehicle seat according to the first embodiment of the present invention, taken along line BB in FIG. 2. FIG. 7 is a perspective view of a frame on a seatback side of a vehicle seat according to a second embodiment of the present invention. It is a perspective view showing the state where the frame at the seat back side of the vehicular seat concerning Example 2 of the present invention was disassembled. FIG. 7 is a cross-sectional view of the frame on the seatback side of the vehicle seat according to the second embodiment of the present invention, taken along the line CC in FIG. 6. FIG. 7 is a cross-sectional view of the frame on the seatback side of the vehicle seat according to the second embodiment of the present invention, taken along the line DD in FIG. 6. FIG. 7 is a cross-sectional view of the frame on the seatback side of the vehicle seat according to the second embodiment of the present invention, taken along the line EE in FIG. 6. It is a perspective view of the frame by the side of the seat back of the vehicle seat concerning Example 3 of the present invention. It is a perspective view showing the state where the frame at the seat back side of the vehicular seat concerning Example 3 of the present invention was disassembled.

  The present invention provides a seat back side frame of a vehicle seat, in which a plurality of parts molded by injection molding using a fiber reinforced resin containing short fibers therein are combined to form a hollow interior. Is characterized in that the cross-sectional shape and wall thickness of the occupant are changed at a position corresponding to the occupant's waist position and shoulder height in a state where the occupant is seated.

Also, the present invention has a structure in which the interior of the seatback frame of the vehicle seat is formed by combining a plurality of parts molded by injection molding using a fiber reinforced resin containing short fibers therein. An annular end is connected to one of a pair of left and right metal brackets, and the other end is connected to the other of the pair of left and right metal brackets.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an appearance of a vehicle seat 100 according to the present embodiment. The vehicle seat 100 according to the present embodiment includes a seat cushion 10 on which an occupant sits, a seatback 20 on which the occupant seated on the seat cushion 10 leans, and a guide rail on which the seat cushion 10 is placed and moves in the front-rear direction. A section 30 is provided. The seat cushion 10 has a configuration in which the surface of a urethane pad 12 is covered with a skin 11. The seat back 20 also has a configuration in which the surface of the urethane pad 22 is covered with a skin 21. The seat back 20 of the vehicle seat 100 according to the present embodiment is an example of a high-back type seat having both functions of a seat back and a headrest.

  FIG. 2 is a perspective view of the frame in a state where the skins 11 and 21 and the urethane pads 12 and 22 are removed from the vehicle seat 100 shown in FIG. In FIG. 2, reference numeral 40 denotes a seatback-side frame constituting the seatback 20. Reference numeral 50 denotes a seat cushion side frame that constitutes the seat cushion 10, and a detailed configuration thereof is omitted. Reference numeral 70 denotes a lower frame that connects the lower end portions on both sides of the seat back side frame 40, and is formed of metal. A connecting rod 60 connects the left and right sides of the seat cushion side frame 50 and is connected to the reclining mechanism 61. The axis of the connecting rod 60 is the center of rotation when the seat back 20 is reclined. The seat back side frame 40 constitutes a high back type seat frame in which the upper part has a headrest frame function.

  FIG. 3 shows a state where the seat back side frame 40 shown in FIG. 2 is taken out and disassembled. The seat back side frame 40 includes a front side frame 41 and a rear side frame 42. Both the front side frame 41 and the rear side frame 42 are formed by injection molding using a fiber reinforced resin containing short fibers made of carbon fiber or glass fiber. The lower frame 70 that connects the lower ends on both sides of the seat back side frame 40 includes a cover 71 that covers a reclining mechanism (not shown) and brackets 72 attached to both sides of the cover 71. The bracket 72 is fixed to the seat back side frame 40 with bolts 73.

  FIG. 4 is a cross-sectional view taken along the line AA of the seat back side frame 40 in FIG. 2 at a height close to the waist from the lower part of the back of the occupant having the standard height. FIG. 5 shows a cross-sectional view taken along a line BB at a height at which the upper part of the back hits.

  In the portion of the seat back side frame 40 where the height near the waist from the lower part of the back of the occupant shown in FIG. 4 is close to the height of the back near the occupant's shoulder shown in FIG. 5, Therefore, the height of the seat back side frame 40 must be suppressed so as not to hinder the movement of the occupant. That is, a cross section of the seat back side frame 40 at a height from the center of reclining (the axis of the connecting rod 60) to a height of about 390 mm parallel to the torso angle and from the lower back to the waist of the occupant (FIG. 2) (AA cross section of FIG. 4) in the height direction: height at which the back near the shoulder of the occupant hits (height of about 390 mm to 550 mm parallel to the torso angle from the center of reclining) with respect to h1 (FIG. 4). The height dimension h2 (FIG. 5) in the section (BB section in FIG. 2) of the seatback-side frame 40 in FIG.

  On the other hand, the width dimension W1 (see FIG. 4) in the AA section of FIG. 2 and the width direction dimension W2 (see FIG. 5) in the BB section are the same.

  As described above, when the widths W1 and W2 are the same, and the heights h1 and h2 are changed to form the seat back-side frame 40, the required cross-sectional strength (cross-sectional modulus) is reduced. In order to ensure the thickness, the thickness of the BB cross section formed with a relatively small dimension h2 is made thicker than the AA cross section formed with a relatively large dimension h1 in the height direction. There is a need to. That is, in this embodiment, the thickness t1 of the front frame 41 and the thickness t2 of the rear frame 42 in the AA cross section are different from the thickness t3 and the rear side of the front frame 41 in the BB cross section. By forming the thickness t4 of the frame 42 to be large, the cross-sectional strength (cross-sectional modulus) of the AA cross section and the BB cross section satisfies the required strength.

  FIGS. 4 and 5 show a method of connecting the front-side frame 41 and the rear-side frame 42 at the AA cross section and the BB cross section formed by changing the thickness in this manner.

  In the AA cross section having a relatively small thickness, as shown in FIG. 4, the opening of the rear frame 42 is inserted from the opening of the front frame 41 into the inside of the front frame 41, and the surfaces that make contact with each other are removed. The connection was made using an adhesive. That is, in a state where the rear frame 42 is inserted into the front frame 41, the portions 43 and 44 where the front frame 41 and the rear frame 42 are in contact with each other are connected with an adhesive. As the adhesive, for example, a methacrylate-based structural adhesive is used. FIG. 4 shows a state in which the bracket 72 is fixed to the inside of the rear frame 42 with bolts (not shown).

  On the other hand, in the BB cross section having a relatively large thickness, as shown in FIG. 5, steps 411 and 412 are formed on the inner surface side of the front frame 41 and the front end of the rear frame 42 is applied. Thereby, the insertion depth of the rear frame 42 inserted inside the front frame 41 is defined. Also in the configuration shown in FIG. 5, the portions 45 and 46 where the front frame 41 and the rear frame 42 are in contact with each other are connected with an adhesive.

  In the above description, the configuration in which the front side frame 41 and the rear side frame 42 are connected using an adhesive has been described, but the adhesive need not always be used. For example, claws are formed in a plurality of portions overlapping with the rear frame 42 of the front frame 41, and the rear frame 42 is formed on the front frame 41 when a part thereof is inserted into the front frame 41. The front frame 41 and the rear frame 42 may be connected by providing a portion that fits with the nail at a position overlapping the nail. Further, the connection using the above-mentioned adhesive and the connection by fitting using the above-mentioned nail may be used in combination.

  Also, an example has been described in which the front frame 41 and the rear frame 42 are formed by injection molding using a fiber-reinforced resin containing short fibers therein, but the material used in this embodiment is not limited to this. Instead, the front frame 41 and the rear frame 42 may be formed using other resin materials.

  According to the present embodiment, the seat back-side frame 40 is formed to have a hollow closed cross-sectional shape as shown in FIG. 4 and FIG. Strength (section modulus) can be secured.

  Further, according to the present embodiment, the base portion of the seat back side frame 40 to which a large moment load is applied when the occupant sits on the lower frame 70 is attached to the cover portion 71 using the metal bracket 72. Thus, the structure can withstand a large moment load and an impact load required for the vehicle seat.

  In the first embodiment, an example is described in which the seat back side frame 40 is configured by the front side frame 41 and the rear side frame 42. However, in the present embodiment, as shown in FIG. Is divided into upper and lower parts, the upper part is composed of two parts of a front upper frame 141 and a rear upper frame 142, and the lower part is a pair of left and right left side frames 143 and right side frames. 144.

  FIG. 7 shows a state where each component is separated. The front upper frame 141 and the rear upper frame 142 were separated from each other as in the first embodiment. On the other hand, the left side frame 143 and the right side frame 144 forming a pair of right and left are not separated in the front and rear, but are integrally formed in a hollow cylindrical shape.

  With such a configuration, first, the front upper frame 141 and the rear upper frame 142 are combined in the same manner as described in the first embodiment, and bonded with an adhesive.

  Next, the left end portion 1411 of the front upper frame 141 and the left end portion 1421 of the rear upper frame 142 bonded with an adhesive are placed in the opening at the upper end of the left side frame 143 having a hollow inside. Insert and glue with adhesive. Here, the left end portion 1411 of the front upper frame 141 is formed to be thinner than the front upper frame 141, and a step is formed between the front upper frame 141 and the front portion 1411. ing. Similarly, the left end portion 1421 of the rear upper frame 142 is formed to be thinner than the rear upper frame 142, and a step is formed between the rear upper frame 142 and the front portion 1421. I have.

  On the other hand, the opening at the upper end of the left side frame 143 is an opening having a size corresponding to a size obtained by combining the front end portion 1411 and the front end portion 1421, and the bonded front end portions 1411 and 1421 are connected to the left side side. When inserted into the opening at the upper end of the frame 143, the step between the front upper frame 141 and the tip portion 1411 and the step between the rear upper frame 142 and the tip portion 1421 hit the tip of the opening, The insertion depth of the front upper frame 141 and the rear upper frame 142 into the left side frame 143 is determined.

  Similarly, the right end portion 1412 of the front upper frame 141 and the right end portion 1422 of the rear upper frame 142 bonded to each other with an adhesive are inserted into the upper end of the right side frame 144 and bonded with an adhesive. . Here, between the front upper frame 141 and the right front end portion 1412, and between the rear upper frame 142 and the right front end portion 1422, the front upper frame 141 and the left front end described above are provided. A step is formed between the upper end of the right side frame 144 and the stepped portion, similarly to the portion 1411 and between the rear upper frame 142 and the left end portion 1421. When inserted into the opening, the step between the front upper frame 141 and the distal end portion 1411 and the step between the rear upper frame 142 and the distal end portion 1421 hit the distal end of the opening, and the front upper frame 141 The depth of insertion into the right side frame 144 with the rear upper frame 142 is determined.

  As a result, the bonded front and upper frames 141 and 142 are connected to the left and right side frames 143 and 144, which form a pair of left and right sides.

  The front side upper frame 141, the rear side upper frame 142, and the left side frame 143 and the right side frame 144 forming a pair of right and left are each a fiber containing a short fiber inside as in the case of the first embodiment. It is molded by injection molding using a reinforced resin.

  FIG. 8 is a sectional view taken along the line CC in FIG. When the right side frame 144 is injection-molded, the bracket 72 of the lower frame 70 is also molded (insert molding), so that a part of the bracket 72 is inserted into the right side frame 144 as shown in FIG. It is in a state of being integrated and integrated. Similarly, for the left side frame 143, a part of the bracket 72 is incorporated into the left side frame 143 and integrated by insert molding.

  FIG. 9 shows a portion in which the right end portion 1412 of the front upper frame 141 and the right end portion 1422 of the rear upper frame 142 are inserted into the upper end portion of the right side frame 144, and DD in FIG. It is an arrow view of a section. The right end portion 1412 of the front upper frame 141 and the right end portion 1422 of the rear upper frame 142 are inserted into the hollow portion from the opening formed in the upper end portion of the right side frame 144 in abutting state. ing. An adhesive is applied and adhered to a portion where the front end portion 1411 of the front upper frame 141 and the front end portion 1421 of the rear upper frame 142 are in contact with the upper end portion of the right side frame 144.

  Although not shown, the relationship between the left end portion 1411 of the front upper frame 141, the left end portion 1421 of the rear upper frame 142, and the left side frame 143 is the same.

  FIG. 10 is a cross-sectional view taken along the line EE in FIG. 6, showing a state in which the front upper frame 141 and the rear upper frame 142 are abutted, and the abutted portions are connected with an adhesive. Is shown.

  In the present embodiment, an example has been described in which each member constituting the seat back side frame 140 is formed by injection molding using a fiber reinforced resin containing short fibers therein, but the material used in the present embodiment is as follows. The present invention is not limited to this, and each member constituting the seatback-side frame 140 may be formed using another resin material.

  Also in the present embodiment, as in the case of the first embodiment, the seat back side frame 140 has a hollow closed cross-sectional shape as shown in FIGS. As a result, required cross-sectional strength (cross-sectional modulus) can be secured.

  Also, as in the case of the first embodiment, according to the present embodiment, the base portion of the seat back side frame 140 to which the large moment load is applied when the occupant sits on the lower frame 70 is attached to the metal bracket 72. By using such a structure to attach to the cover portion 71, a structure capable of withstanding a moment load and an impact load required for a vehicle seat can be provided.

  Further, according to the present embodiment, the seat back side frame 140 is divided into two parts, upper and lower, and each is injection-molded. Therefore, compared with the case of the first embodiment, the mold used for injection molding is smaller. And can be molded using a relatively small injection molding apparatus.

  In the second embodiment, the upper portion of the seatback-side frame 140 is constituted by the front upper frame 141 and the rear upper frame 142. On the other hand, in the present embodiment, after the front upper frame 141 and the rear upper frame 142 are integrated, they are divided into two in the length direction, and each is divided into two parts, the left side frame 143 and the right side frame 143. Like the side frame 144, it was formed in a tubular shape.

  That is, in the present embodiment, all the mold members constituting the seat back side frame 240 are formed in a hollow cylindrical shape.

  FIG. 11 shows a configuration of the seat back side frame 240 according to the present embodiment. The seat back side frame 240 according to the present embodiment includes a left top frame 2411 and a right top frame 2412, a left middle frame 2421 and a right middle frame 2422, and a left side frame 2431 as shown in FIG. And a right side frame 2432.

  The relationship between the left side frame 2431 and the right side frame 2432 and the bracket 72 of the lower frame 70 is similar to that described with reference to FIG. And the right side frame 2432 and are integrally formed.

  A step is formed between the left middle frame 2421 and the front end portion 2423, and the front end portion 2423 is the front end portion of the left side frame 2431 in the same manner as described with reference to FIG. (In FIG. 12, the side near the distal end portion 2423 of the left middle frame 2421) is inserted into the internal hollow portion from the opening, and the step between the left middle frame 2421 and the distal end portion 2423 is The inner side of the hollow portion of the left side frame 2431 and the surface of the distal end portion 2423 of the left middle frame 2421 are fixed by an adhesive in a state of stopping against the distal end of the opening.

  Also, a step is formed between the right middle frame 2422 and the front end portion 2424, and the front end portion 2423 is formed on the right side frame 2432 in the same manner as described with reference to FIG. Inserted into the internal cavity from the opening of the tip portion (in FIG. 12, the right middle frame 2422 and the side near the tip portion 2424), the step between the right middle frame 2422 and the tip portion 2424 is inserted into the right side. The inner side of the hollow portion of the right side frame 2432 and the surface of the distal end portion 2424 of the right middle frame 2422 are fixed with an adhesive in a state where it abuts against the distal end of the opening of the side frame 2432 and stops.

  A step is also formed between the left top frame 2411 and the distal end portion 2413. The distal end portion 2413 is similar to the distal end portion of the left middle frame 2421 (see FIG. In FIG. 12, a step portion between the left top frame 2411 and the tip portion 2413 is inserted into the internal hollow portion from the opening on the side (closer to the tip portion 2413 of the left top frame 2411), and the opening of the left middle frame 2421 is formed. In a state where it abuts against the front end portion of the portion and stops, the inside of the hollow portion of the left middle frame 2421 and the surface of the front end portion 2413 of the left top frame 2411 are fixed with an adhesive.

  Also, a step is formed between the right top frame 2412 and the front end portion 2414, and the front end portion of the right middle frame 2422 (FIG. 12) as described with reference to FIG. At the side of the right top frame 2412 (closer to the distal end portion 2414), is inserted into the internal hollow portion, and the step between the right top frame 2412 and the distal end portion 2414 forms the opening of the right middle frame 2422. In a state in which it abuts against the tip of the right middle frame 2422, the inside of the hollow portion of the right middle frame 2422 and the surface of the tip 2414 of the right top frame 2412 are fixed with an adhesive.

  In addition, the distal end portion 2415 of the left top frame 2411 is inserted into the internal hollow portion from the opening at the distal end portion of the right top frame 2412 (on the side close to the distal end portion 2415 of the left top frame 2411). In a state where the step between the tip portion 2415 and the tip of the opening of the right top frame 2412 stops and stops, the inside of the hollow portion of the right top frame 2412 and the surface of the tip portion 2415 of the left top frame 2411 Are fixed by an adhesive.

  Also in the present embodiment, as in the case of the first and second embodiments, the seat back side frame 240 is configured to have a hollow closed cross-sectional shape, so that the seat back side frame 240 is reduced in weight and a required cross section is provided. Strength (section modulus) can be secured.

  Also, as in the case of the first and second embodiments, according to the present embodiment, the base of the seatback-side frame 240, to which a large moment load is applied when the occupant is seated, to the lower frame 70, is formed of a metal bracket. By using the structure 72 to attach to the cover 71, a structure capable of withstanding a moment load and an impact load required for the vehicle seat can be provided.

  Furthermore, according to the present embodiment, the seat back side frame 240 is configured so that the left and right are divided into six parts, upper, middle, and lower, and each is formed in a cavity structure by injection molding. As compared with the case of the above, the mold used for the injection molding can be downsized, the assembling becomes easy, and the manufacturing cost can be reduced.

  In the present embodiment, an example has been described in which each member constituting the seatback-side frame 240 is formed by injection molding using a fiber-reinforced resin containing short fibers therein. The present invention is not limited to this, and each member constituting the seat back side frame 240 may be formed using another resin material.

  As described above, the invention made by the inventor has been specifically described based on the embodiments. However, it is needless to say that the present invention is not limited to the above-described embodiments, and can be variously modified without departing from the gist thereof. No. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Seat cushion 20 ... Seat back 40, 140, 240 ... Seat back side frame 41 ... Front side frame 42 ... Rear side frame 70 ... Lower frame 71 ... Cover part 72 bracket 100 vehicle seat 141 front upper frame 142 rear upper frame 143 left side frame 144 right side frame 2411 left top Frame 2412 right top frame 2421 left middle frame 2422 right middle frame 2431 left side frame 2432 right side frame.

Claims (14)

A vehicle seat including a seat cushion and a seat back,
The seat back includes a seat back side frame, a metal lower frame connected to the seat back side frame, and a urethane pad whose surface is covered with a skin,
The seatback-side frame is formed as a cavity by combining a plurality of parts molded by injection molding using a fiber-reinforced resin containing short fibers therein,
The cross section of the portion of the seat back side frame connected to the metal lower frame is higher than the cross section of the seat back side frame in a portion corresponding to the height of the occupant's shoulder when the occupant is seated. A vehicle seat characterized in that the dimension in the width direction is large.   2. The vehicle seat according to claim 1, wherein a cross section of a portion of the seatback-side frame connected to the metal lower frame corresponds to a height of a occupant's shoulder when the occupant is seated. 3. The vehicle seat according to any one of claims 1 to 3, wherein the thickness is smaller than a cross section of the seat back side frame.   3. The vehicle seat according to claim 2, wherein the seatback further includes a reclining mechanism, and a plurality of components forming the seatback-side frame are parallel to a torso angle from a center of rotation of the reclining mechanism. 4. The thickness of a portion having a height of about 390 mm to about 550 mm parallel to the torso angle from the center of rotation of the reclining mechanism is formed to be thicker than a thickness of about 390 mm. Vehicle seats.   3. The vehicle seat according to claim 2, wherein the plurality of parts constituting the seatback-side frame include a front frame and a rear frame, and the front frame and the rear frame are each formed by injection molding. Wherein the front frame and the rear frame are joined by an adhesive.   3. The vehicle seat according to claim 2, wherein the plurality of components constituting the seatback-side frame include a lower portion that is closer to the waist of the occupant and an upper portion that is closer to the occupant. 4. A vehicle seat, wherein the upper portion is further constituted by a front upper frame and a rear upper frame, and the lower portion is constituted by a pair of left and right cylindrical frames. .   6. The vehicle seat according to claim 5, wherein the pair of left and right cylindrical side frames is formed integrally with a metal bracket constituting the metal lower frame by insert molding. A vehicle seat characterized by the above-mentioned.   3. The vehicle seat according to claim 2, wherein the plurality of parts constituting the seatback-side frame are configured such that the seatback-side frame includes a lower portion that is a part near a waist of the occupant, and The middle part is a part near the shoulder and the upper part is a part near the head of the occupant. The upper part, the middle part, and the lower part are each formed of a hollow cylindrical member. A vehicle seat characterized in that: A vehicle seat including a seat cushion and a seat back,
The seatback includes a seatback-side frame, a lower metal frame connected to the seatback-side frame, and a urethane pad whose surface is covered with a skin,
The metal lower arm includes a pair of left and right metal brackets,
The seatback-side frame is formed in an annular shape having a hollow interior with openings at both ends by combining a plurality of parts formed by injection molding a fiber reinforced resin containing short fibers therein, and one of the annular shapes is formed. Connected to one of the pair of left and right metal brackets near the opening at one end of the pair, and connected to the other of the pair of left and right metal brackets near the opening at the other end of the annular shape. A vehicle seat characterized in that:   9. The vehicle seat according to claim 8, wherein the seatback-side frame has a cross section near the opening at the one end of the annular shape connected to the one of the pair of left and right metal brackets. 10. The cross section near the opening at the other end of the annular shape connected to the other of the pair of left and right metal brackets corresponds to the height of the occupant's shoulder when the occupant is seated. A vehicle seat characterized in that it has a smaller thickness and a larger dimension in a height direction than a cross section of the seat back side frame in a portion where the seat back frame is formed.   9. The vehicle seat according to claim 8, wherein the seatback further includes a reclining mechanism, and the plurality of components forming the seatback-side frame are parallel to a torso angle from a center of rotation of the reclining mechanism. 9. The thickness of a portion having a height of about 390 mm to about 550 mm parallel to the torso angle from the center of rotation of the reclining mechanism is formed to be thicker than a thickness of about 390 mm. Vehicle seat.   9. The vehicle seat according to claim 8, wherein the plurality of parts constituting the seat back side frame formed by injection molding a fiber reinforced resin containing the short fibers therein are a front frame and a rear frame. Wherein the front frame and the rear frame are joined with an adhesive.   9. The vehicle seat according to claim 8, wherein the plurality of parts constituting the seatback-side frame formed by injection-molding a fiber-reinforced resin containing the short fibers therein are close to a passenger's waist. The upper part is composed of a lower part which is a part and an upper part which is a part close to the shoulder of the occupant, and the upper part is further divided into front and rear parts to constitute a front upper frame and a rear upper frame. A first side frame having the opening at one end connected to the one of the pair of left and right metal brackets, and the other end connected to the other of the pair of left and right metal brackets; And a second side frame having the opening portion of the vehicle seat.   13. The vehicle seat according to claim 12, wherein the first side frame and the second side frame are each formed with the metal bracket by insert molding. Vehicle seat.   The vehicle seat according to claim 9, wherein the plurality of parts constituting the seatback-side frame include a seatback-side frame, a lower portion being a portion near a waist of the occupant, and The middle part is a part near the shoulder and the upper part is a part near the head of the occupant. The upper part, the middle part, and the lower part are each formed of a hollow cylindrical member. A vehicle seat characterized in that:

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