JP6450635B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat.

  2. Description of the Related Art Conventionally, a vehicle seat is known in which a seat back, in which a headrest portion is integrally formed so as not to be vertically adjustable, is fixed to a body like a rear seat of a sedan type automobile. The seat back 100 shown in FIG. 6 is formed by placing a back pad 120 made of urethane foam on a back frame 110 and covering the back cover 130 made of fabric thereon. The back frame 110 has an upper pipe 111 made of a steel pipe whose main part is a straight line, a lower pipe 112 made of a steel pipe formed in a U shape in a front view, and a plurality of steel wires laid between them. 113. Further, three steel pipe headrest frames 114 formed in an inverted U shape in front view for supporting the headrest portion of the back pad 120 are attached to the upper pipe 111. Further, three floor fixing wires 115 formed by forming steel wires in a U shape in front view are attached to the lower portion of the lower pipe 112. A similar structure is described in Patent Document 1.

JP 2011-105037 A

  In the above-described rear seat, since the headrest frame 114 is attached to the main portion of the back frame 110, it is necessary to use a steel pipe frame, a steel plate press-formed product frame, or the like to ensure the strength of the main portion of the back frame 110. there were. Further, the back pad 120 has been obtained by molding a relatively high density urethane foam with the main body portion and the headrest portion integrated. As a result, the weight of the entire rear seat is large, and a reduction in weight has been desired.

  In view of such a demand, an object of the present invention is to provide a vehicle seat provided with a body-fixed type seat back, which reduces the weight while ensuring the support strength of the headrest portion.

  A first invention of the present invention is a vehicle seat in which a seat back integrally provided with a headrest portion in a main body portion is fixed to a vehicle body, the back frame being a skeleton member of the main body portion, and the back frame A urethane foam back pad which is attached and is a cushioning material for the headrest part, and a bead foam molded body having a lower density than the urethane foam is inserted into the headrest part of the backpad. And a support member for supporting the headrest portion of the back pad from the side opposite to the seating surface is formed on the vehicle body.

  According to the first invention, a bead foam molded body having a lower density and higher rigidity than the urethane foam is inserted into the headrest portion of the urethane foam back pad, and the portion is supported by the support member formed on the body. . Here, the headrest portion of the seat back is supported with respect to the body by the highly rigid bead foam molded body and the support member, so that sufficient strength is maintained. Further, the headrest frame in the back frame can be omitted, and the weight can be reduced by replacing a part of the urethane foam back pad with a bead foam molded body having a lower density than the urethane foam. Accordingly, it is possible to reduce the weight of the vehicle seat while ensuring the support strength of the headrest portion.

  According to a second aspect of the present invention, in the first aspect, the back frame is a wire frame in which steel wires are combined.

  According to the second aspect of the present invention, since a high-strength and heavy member such as a steel pipe frame or a press-formed product of a steel plate is not used for the back frame, the weight can be further reduced.

  According to a third aspect of the present invention, in the first aspect or the second aspect, the support member is a plate-like member formed in a mountain shape, and the headrest portion of the back pad is formed on one inclined surface of the mountain shape. It is a member made to contact | abut on the surface on the opposite side to the seating surface.

  According to the third aspect of the invention, the support member can have a simple and lightweight configuration.

It is the perspective view which looked at the rear seat for vehicles of one embodiment of the present invention from diagonally forward. It is the disassembled perspective view which looked at the seat back of the rear seat for cars of the above-mentioned embodiment from diagonally forward. It is sectional drawing cut | disconnected and shown by the III-III line of FIG. It is sectional drawing cut | disconnected and shown by the IV-IV line of FIG. It is a front view which shows the state which inserted the back frame in the back pad of the said embodiment. It is a front view of the conventional back pad.

  1 to 5 show an embodiment of the present invention. This embodiment shows an example in which the present invention is applied to an automobile rear seat. In each figure, each direction when the rear seat for automobiles is attached to the automobile is indicated by arrows. In the following description, the description regarding the direction is made based on this direction. The automotive rear seat 1 according to the present embodiment includes a seat cushion 10 serving as a seating portion, a seat back 20 serving as a backrest, and a support member 30 that supports a part of the seat back 20.

  As shown in FIG. 1, the seat cushion 10 includes a cushion frame 11 that forms a skeleton, a cushion pad 12 that is a cushion material, and a cushion cover 13 that is a skin material. The seat back 20 includes a back frame 21 that forms a skeleton, a back pad 22 that is a cushion material, and a back cover 23 that is a skin material. Since the seat cushion 10 has a known configuration, the description thereof will be omitted, and the seat back 20 and the support member 30 will be described.

  As shown in FIGS. 1 and 3, the seat back 20 includes a main body 20 a that supports the back of the seated person, two side headrest parts 20 b 1 that support the head of the seated person, and one center headrest part 20 b 2. ing. The side headrest part 20b1 supports the heads of seated persons on both the left and right sides, and the center headrest part 20b2 supports the heads of seated persons on the center seat. The side headrest portion 20b1 is formed to be higher than the center headrest portion 20b2. Here, the side headrest portion 20b1 and the center headrest portion 20b2 correspond to a “headrest portion” in the claims.

  As shown in FIGS. 2 and 5, a back frame 21 is disposed on the main body 20 a of the seat back 20. Specifically, it is inserted into a pad main body portion 22a of the back pad 22 described later. The back frame 21 is formed by combining steel wires having a diameter of about 5 mm. The back frame 21 mainly includes a frame body 21a having a substantially rectangular shape when viewed from the front, two horizontal wires extending in the left-right direction by connecting the left and right sides of the frame body 21a, and two upper and lower sides of the frame body 21a and 2 It is composed of six vertical wires 21d that connect the two horizontal wires and extend substantially in the vertical direction. Specifically, the frame body 21a includes an L-shaped frame side wire 21a1 that is disposed symmetrically, a frame upper wire 21a2 that connects the upper ends of the frame side wire 21a1, and a lower side of the frame side wire 21a1. A substantially U-shaped frame lower wire 21a3 for connecting inner end portions to each other. The frame side wire 21a1 is connected to the upper horizontal wire 21b1 in the upper part and the lower horizontal wire 21b2 in the lower part. The frame upper wire 21a2, the upper horizontal wire 21b1, the lower horizontal wire 21b2, and the frame lower wire 21a3 are respectively provided by two vertical wires 21d at portions corresponding to the center seat portion and the left and right side seat portions. It is connected. The two vertical wires 21d are arranged such that the upper interval is wider than the lower interval at the portion corresponding to each seat. A small lateral wire 21e is bridged between the narrow lower portions of the two vertical wires 21d. In a portion corresponding to each seat, a U-shaped body fixing wire 21f is attached between the small horizontal wire 21e and the frame lower wire 21a3. A central portion in the left-right direction of the frame upper wire 21a2 and the three body fixing wires 21f are attachment portions to the body.

  As shown in FIGS. 1 and 2, the back pad 22 includes a pad main body portion 22a having a substantially rectangular shape in front view, two pad side headrest portions 22b1 protruding upward from the upper surface of the pad main body portion 22a, and And one pad center headrest portion 22b2. The positions of the pad side headrest portion 22b1 and the pad center headrest portion 22b2 correspond to the positions of the side headrest portion 20b1 and the center headrest portion 20b2 of the seat back 20, respectively.

  As shown in FIGS. 3 and 5, the pad side headrest portion 22b1 has the same left and right shape and is formed to be higher than the pad center headrest portion 22b2. The pad main body portion 22a and the pad side headrest portion 22b1 are inserted with a side bead foam molded body 22c1 that is disposed across most of the pad side headrest portion 22b1 and a portion near the upper portion of the pad main body portion 22a. It is molded integrally with urethane foam. Specifically, the side bead foam molded body 22c1 is substantially similar to the outer shape of the pad side headrest portion 22b1 of the back pad 22 and has a small form, and the seat occupant side surface 22c11, the upper surface 22c12, and the left and right side surfaces 22c13 are substantially the same. It is covered with a urethane foam of equivalent thickness. The back surface 22c14 that is the surface opposite to the seating surface of the side bead foam molded body 22c1, that is, the back surface of the back pad 22 is not covered with the urethane foam and is exposed. A groove 22c15 is provided in the lower part of the back surface 22c14 of the side bead foam molded body 22c1 toward the seating surface, and the frame upper wire 21a2 is arranged in the groove 22c15.

  As shown in FIGS. 4 and 5, the pad main body portion 22a and the pad center headrest portion 22b2 are arranged so as to straddle a large portion of the pad center headrest portion 22b2 and a part near the upper portion of the pad main body portion 22a. It is integrally molded with a urethane foam with the bead foam molded body 22c2 inserted. Specifically, the center bead foam molded body 22c2 is substantially similar to the outer shape of the pad center headrest portion 22b2 of the back pad 22, and has a small form. It is covered with a urethane foam of equivalent thickness. The back surface 22c24 which is the surface opposite to the seating surface of the center bead foam molded body 22c2, that is, the back surface of the back pad 22 is not covered with the urethane foam and is exposed. A cutout 22c25 is provided in the lower portion of the back surface 22c24 of the center bead foam molded body 22c2 toward the seating surface, and the frame upper wire 21a2 is arranged in the cutout 22c25.

The urethane foam is a foam of urethane resin, and its density is about 0.04 g / cm ³ . The side bead foam molded body 22c1 and the center bead foam molded body 22c2 are foams of an olefin resin such as polypropylene or polyolefin, and the density thereof is about 0.03 g / cm ³ . The manufacturing method of the back pad 22 is as follows. The side bead foam molded body 22c1 and the center bead foam molded body 22c2 and the back frame 21 which have been molded into a predetermined shape in advance are set at predetermined locations in the cavity of a urethane foam mold having a cavity substantially in the shape of the back pad 22. At this time, the frame upper wire 21a2 of the back frame 21 is disposed in the groove 22c15 of the side bead foam molded body 22c1 and the notch 22c25 of the center bead foam molded body 22c2. A liquid urethane raw material is injected to close the urethane foaming mold, and the urethane raw material is foamed and solidified by holding at a predetermined temperature for a predetermined time. After the elapse of a predetermined time, the side pad foam molded body 22c1, the center bead foam molded body 22c2, and the back pad 22 integrally molded with the back frame 21 are removed. The bead foam may be insert-molded in a portion that does not affect the ride comfort, for example, the main portion of the center seat or the side portion of the side seat, so as to further reduce the weight.

  As shown in FIGS. 2 to 4, two side support members 30 and one center support member 31 are disposed on an upper portion of a rectangular tube-shaped horizontal member 40 that is disposed between the left and right wall portions of the body. Is installed. The side support member 30 is a support member for the side headrest portion 20b1, and the center support member 31 is a support member for the center headrest portion 20b2. The side support members 30 have the same shape on the left and right and are formed higher than the center support member 31.

  As shown in FIGS. 2 and 3, the side support member 30 is a member mainly composed of a front slope portion 30a and a rear slope portion 30b formed by bending a steel plate into a mountain shape. A front flange portion 30a1 extending downward from the lower end of the front slope portion 30a is formed. A rear flange portion 30b1 extending rearward from the lower end of the rear slope portion 30b is formed. Specifically, the lateral member 40 has a front surface portion 41, an upper surface portion 42, a rear surface portion 43, and a lower surface portion 44, and the front flange portion 30 a 1 of the side support member 30 is located above the front surface portion 41 and the rear of the side support member 30. The flange portion 30b1 is fastened and fixed to the rear portion of the upper surface portion 42 with bolts and nuts.

  As shown in FIGS. 2 and 4, the center support member 31 is a member mainly composed of a front slope part 31a and a rear slope part 31b formed by bending a steel plate into a mountain shape. A front flange portion 31a1 extending downward from the lower end of the front slope portion 31a is formed. A rear flange portion 31b1 extending rearward from the lower end of the rear slope portion 31b is formed. Specifically, the front flange portion 31a1 of the center support member 31 is fastened and fixed to the upper portion of the front surface portion 41, and the rear flange portion 31b1 of the center support member 31 is fastened to the rear portion of the upper surface portion 42 with bolts and nuts.

  As shown in FIGS. 3 and 4, an end of a partition panel 45 that partitions the vehicle compartment and the cargo compartment is fixed to the lower portion of the front surface portion 41 of the lateral member 40. Ribs extending in the vertical direction may be formed on the front slope portions 30a and 31a and the rear slope portions 30b and 31b of the side support member 30 and the center support member 31 in order to ensure rigidity. The cover member 50 is a member for improving the appearance by covering the lateral member 40 with the side support member 30 and the center support member 31 attached at predetermined positions from above. A plate material obtained by laminating a resin sheet such as polypropylene on the back surface of a carpet is formed by stamping molding, vacuum molding, or the like. Screws are fixed to the lateral member 40 at a plurality of positions (not shown).

  A procedure for attaching the seat back 20 to the body will be described with reference to FIGS. The horizontal member 40 to which the side support member 30 and the center support member 31 are attached is attached in a bridging manner between the wall portions on the left and right sides of the body, and the cover member 50 formed thereon is attached. The central portion of the frame upper wire 21a2 of the back frame 21 is hooked on a locking member (not shown) provided on the front surface portion 41 of the lateral member 40, and three body fixing wires 21f are formed on the floor. It is inserted into a locking hole (not shown) and fixed. The three body fixing wires 21f may be fixed to the floor via any member, for example, a pipe extending in the left-right direction to which an ISO-FIX striker is attached. At this time, the two pad side headrest portions 22 b 1 of the back pad 22 are in positions corresponding to the two side support members 30 attached to the lateral member 40. The pad center headrest portion 22 b 2 of the back pad 22 is at a position corresponding to the center support member 31 attached to the lateral member 40. As a result, the two pad side headrest portions 22b1 of the back pad 22 each have the back surface 22c14 of the side bead foam molded body 22c1 inserted therein to the front slope portion 30a of the support member 30 via the cover member 50. Abutted and supported. The pad center headrest portion 22b2 of the back pad 22 is supported by the back surface 22c24 of the center bead foam molded body 22c2 inserted into the pad center headrest portion 22b2 contacting the front slope portion 31a of the support member 31 via the cover member 50. The

  The embodiment configured as described above has the following operational effects. The side headrest portion 20b1 and the center headrest portion 20b2 of the seat back 20 are supported with respect to the body as follows. That is, a lightweight, high-rigidity side bead foam molded body 22 c 1 that is insert-molded in the pad side headrest portion 22 b 1 of the back pad 22 is supported by the side support member 30 with respect to the body. Further, a lightweight, high-rigidity center bead foam molded body 22c2 that is insert-molded in the pad center headrest portion 22b2 of the back pad 22 is supported by the center support member 31 with respect to the body. Accordingly, the side headrest portion 20b1 and the center headrest portion 20b2 can be supported with sufficient strength without a frame as a skeleton member that supports the pad side headrest portion 22b1 and the pad center headrest portion 22b2 of the back pad 22. Further, it is not necessary to provide a headrest frame on the back frame 21, and the weight is reduced by replacing a part of the back pad 22 with a side bead foam molded body 22c1 and a center bead foam molded body 22c2 having a lower density than the urethane foam. Is possible. Together, these effects can reduce the weight of the vehicle seat while ensuring the support strength of the headrest portion.

  Moreover, since it is not necessary for the back frame 21 to maintain the strength to support the headrest frame, a wire frame in which steel wires are combined can be obtained. As a result, it is not necessary to use a high-strength and heavy member such as a steel pipe frame or a press-formed product of a steel plate, and the weight can be further reduced. Further, the side support member 30 and the center support member 31 that support the headrest portion of the back pad 22 with respect to the body are members in which steel plates are formed in a mountain shape. Accordingly, the side support member 30 and the center support member 31 can be configured to be simple and lightweight.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, the following can be mentioned.

  1. In the above embodiment, the side support member 30 and the center support member 31 are attached to the lateral member 40 as separate members. Not limited to this, a part of the lateral member 40 may be deformed to support the headrest portion of the back pad 22. Moreover, although the side support member 30 and the center support member 31 were manufactured using a steel plate, you may manufacture using not only this but resin, a composite resin, etc.

  2. In the above embodiment, the side bead foam molded body 22c1, the center bead foam molded body 22c2, and the back frame 21 are insert-molded into a urethane foam. However, the present invention is not limited to this, and the separately created side bead foam molded body 22c1 and / or center bead foam molded body 22c2 and / or the back frame 21 may be attached to the molded urethane foam.

  3. In the above embodiment, the present invention is applied to an automobile seat, but may be applied to a seat mounted on a ship, a train, or the like.

1 Automotive rear seats (vehicle seats)
20 Seat back 20a Main part 20b1 Side headrest part (headrest part)
20b2 Center headrest part (headrest part)
21 Back frame 22 Back pad 22a Pad main body portion 22b1 Pad side headrest portion 22b2 Pad center headrest portion 22c1 Side bead foam molded body (bead foam molded body)
22c2 Center bead foam molding (bead foam molding)
30 Side support member (support member)
31 Center support member (support member)

Claims (3)

A vehicle seat in which a seat back integrally provided with a headrest portion in a main body portion is fixed to a vehicle body,
A back frame that is a skeleton member of the main body , and a back pad that is attached to the back frame and mainly includes a urethane foam that is a cushioning material for the main body and the headrest.
A bead foam molded body having a density lower than that of the urethane foam is inserted on the side opposite to the seating surface of the headrest portion of the back pad, and a support member for supporting the bead foam molded body from the side opposite to the seating surface is provided. A vehicle seat formed on a vehicle body.   2. The vehicle seat according to claim 1, wherein the back frame is a wire frame in which steel wires are combined. 3. The support member according to claim 1, wherein the support member is a plate-shaped member formed in a mountain shape, and the inclined surface of the mountain shape is in contact with a surface opposite to a seating surface of the bead foam molded body. A vehicle seat which is a member to be made.

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