JP2015193303A - vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a vehicle seat excellent in productivity and including a seat shell having high rigidity, capable of ensuring good appearance and preventing the comfort of a seated person from being diminished.SOLUTION: A seat back 30 or a seat cushion of a vehicle seat comprises a seat shell 32; and a reinforcement member 50 attached to the seat shell 32 and reinforcing the seat shell 32. The seat shell includes a through-hole 36 provided to communicate a passenger seating surface with an opposite surface to the passenger seating surface, and the reinforcement member 50 is formed to have a hat-like cross-section, and attached to the seat shell 32 in a state in which a flange portion 51 of the hat-like cross-section abuts on a circumferential edge portion 36c of the through-hole 36 on the passenger seating surface of the seat shell 32, and in which a convex portion 52 of the hat-like cross-section passes through the through-hole 36 and protrudes to the opposite surface to the passenger seating surface of the seat shell 32.

Description

  The present invention relates to a vehicle seat including a seat shell as a structure.

  A vehicle seat in which a seat back or a seat cushion includes a seat shell as a structure is known. The seat shell is mainly manufactured using fiber reinforced plastic.

  As a first method of molding a sheet shell using fiber reinforced plastic, there is a method of injection molding using pellets prepared by kneading carbon or glass short fibers in a thermoplastic resin. The first method has good productivity and can manufacture the seat shell at a low cost.

  As a second method, a sheet material obtained by impregnating and hardening a thermoplastic resin to a woven or felted planar member made of continuous carbon or glass fibers is heat-softened in a furnace, and then set in a mold. There is a method of forming by pressing. When the second method is used, a fiber-reinforced plastic having higher rigidity than that obtained by the first method can be obtained. Patent Document 1 describes a back frame of a vehicle seat molded by the second method. However, the second method is more complicated than the first method, and the productivity is poor. Therefore, when the sheet shell is formed using the second method, the manufacturing cost increases.

JP-A-55-84110

  The seat shell is formed by the first method, and the reinforcing member is attached as a rib. As a result, a seat shell having a partially rigid structure can be obtained at low cost. In this case, the reinforcing member is provided with a flange portion for attaching the reinforcing member to the seat shell. When the reinforcing member is attached to the side opposite to the passenger seating surface of the seat shell, the flange portion appears to rise as a step from the rear surface shape of the seat shell by the thickness of the flange portion. As a result, there is a problem that the sense of unity of the rear surface shape of the seat shell is impaired and the appearance is deteriorated. On the other hand, when the reinforcing member is attached to the occupant seating surface side of the seat shell, the reinforcing member presses the seat pad mounting space placed on the occupant seating surface of the seat shell. For this reason, there was a problem that the seat pad had to be made small and the comfort of the seated person was impaired.

  In view of such a problem, an object of the present invention is to provide a structure that has a good appearance and does not impair the comfort of a seated person in a vehicle seat including a seat shell having high productivity and high rigidity. is there.

  A first aspect of the present invention is a vehicle seat in which a seat back or a seat cushion includes a seat shell as a structure and a reinforcing member attached to the seat shell to reinforce the seat shell. The seat shell is provided with a through hole that communicates the occupant seating surface side of the seat shell with the opposite surface side of the occupant seating surface, and the reinforcing member is formed in a cross-sectional hat shape. The flange portion of the shape abuts the peripheral edge portion of the through hole on the passenger seating surface side of the seat shell, and the convex portion having the hat-shaped cross section passes through the through hole and is on the opposite surface side of the seat seat surface of the seat shell It is attached with respect to the said seat shell in the state arrange | positioned so that it may protrude.

  According to the first invention, the reinforcing member is attached to the seat shell. Therefore, for example, even if the seat shell is molded by a molding method that is inferior in rigidity but high in productivity, the rigidity of a necessary portion can be increased. In addition, the flange portion of the reinforcing member is mounted on the occupant seating surface side of the seat shell, and the occupant seating surface side of the seat shell is placed on the seat pad and covered with the seat cover, so it is not visible from the outside, and looks good I can do it well. Moreover, since the convex part of the reinforcing member protrudes on the side opposite to the passenger seating surface of the seat shell, the seating space of the cushion pad is not pressed and the sitting comfort of the seated person is not deteriorated.

  A second invention of the present invention is the vehicle seat according to the first invention, wherein the seat back includes the seat shell, and the reinforcing member has the convex portion corresponding to a seated shoulder of the seat shell. The seat shell is attached to the seat shell in a state extending over both shoulder positions of the seated person at the height position.

  In general, it is known that the higher the bending rigidity in the left-right direction on the upper side of the seat back (in the vicinity of the portion where the shoulder of the seated person hits), the higher the head support performance at the time of rear-end collision. According to the second invention, the convex part of the reinforcing member is extended so as to extend over both shoulders at a height position corresponding to the shoulder of the seated person. Thereby, the bending rigidity in the left-right direction on the upper side of the seat shell can be effectively increased.

  According to the present invention, in a structure that achieves both good productivity and high rigidity, the appearance is good and the comfort of the seated person can be maintained.

It is the perspective view which looked at the vehicle seat which concerns on one Embodiment of this invention from diagonally back. It is the perspective view which looked at the back pan used in the vehicle seat which concerns on the said embodiment from diagonally back. It is the perspective view which looked at the back pan which concerns on the said embodiment from diagonally forward. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG.

  1 to 5 show an embodiment of the present invention. The vehicle seat 10 of the present embodiment includes a seat cushion 20 on which an occupant sits and a seat back 30 that serves as a backrest. The seat cushion 20 is a cushion pad that is placed on an iron cushion frame and covered with an outer skin, and elastically supports the load of the seated person. The seat back 30 supports the back surface of the seated person with a back pad 33 that is placed on a shell-type back pan 32 and is covered with a skin. In each figure, each direction of the vehicle when the vehicle seat is attached is indicated by an arrow. In the following description, the description regarding the direction is made based on this direction.

  As shown in FIG. 1, the seat cushion 20 is attached to the floor F through a slide rail 21 so that the position of the seat cushion 20 can be adjusted in the front-rear direction. A cushion frame (not shown) is attached to the lower arm 22 connected to the slide rail 21. A cushion pad made of urethane foam, which is a cushion material, is placed on the cushion frame, and a cushion cover 23, which is a skin, is placed on the cushion pad to constitute the seat cushion 20.

  The seat back 30 includes a shell-type back pan 32, a back pad 33 placed thereon, and a back cover 34 placed thereon. A side standing wall portion 32f of the back pan 32 is attached with bolts and nuts to an upper arm 31 (metal connecting member) attached to the lower arm 22 via a recliner 40. The tilt of the seat back 30 can be adjusted with respect to the seat cushion 20 by the action of the recliner 40. The upper arm 31 extends upward to a height position corresponding to the chest of the seated person. The back pan 32 corresponds to a “seat shell” in the claims.

  As shown in FIGS. 2 to 5, the back pan 32 is formed in a concave shape so as to conform to the outer shape of the upper body of the seated person. The back pan 32 is provided with two belt holes 32e for passing the seat belt at positions corresponding to the upper shoulders of the seated person. A folded portion 32 j is formed at the terminal portion of the back pan 32. The folded portion 32j is for locking and fixing the end of the back cover 34. In the back pan 32, rectangular through holes 36 that are long to the left and right are formed at height positions corresponding to both shoulders of the seated person. A reinforcing member 50 is attached to the through hole 36.

  The back pan 32 is manufactured using a fiber reinforced plastic in which a carbon fiber having a fiber length of about 1 mm is used as a reinforcing material and polypropylene is used as a matrix resin. The mold is formed by press-fitting a pellet obtained by kneading the carbon fiber and polypropylene into a mold that forms a cavity having substantially the same shape as the back pan 32 when the upper and lower molds are closed. Then, it is a so-called injection molding in which the mold is cooled and removed.

  As shown in FIGS. 1 to 5, the reinforcing member 50 extends in the left-right direction at a height position corresponding to the shoulder of the seat of the vehicle seat 10 in the back pan 32. The reinforcing member 50 is formed separately from the back pan 32 and functions as a reinforcing rib of the back pan 32. The reinforcing member 50 is formed in a hat shape in cross section, and includes a collar portion 51 and a convex portion 52. The rear surface of the collar portion 51 is formed into a surface shape corresponding to the surface shape of the peripheral edge portion 36 c of the through hole 36 on the front surface (occupant seating surface) side of the back pan 32. The reinforcing member 50 is attached in a state where the rear surface of the collar portion 51 is in contact with the peripheral edge portion 36c. At this time, the protrusion 52 passes through the through hole 36 and protrudes from the rear surface (opposite surface of the passenger seating surface) of the back pan 32. The convex part 52 includes a four-sided standing wall part 52B that rises rearward from the collar part 51, and a connecting wall part 52A that connects the rear end parts of the standing wall part 52B. The outer periphery of the front end portion of the standing wall portion 52 </ b> B of the convex portion 52 is shaped to be slightly smaller than the shape of the inner peripheral edge of the through hole 36. By attaching the reinforcing member 50 to the back pan 32, the convex portion 52 is in a state of covering the entire area of the through hole 36.

  The reinforcing member 50 is manufactured using a fiber reinforced plastic in which a woven fabric having a thickness of 0.2 mm knitted from continuous carbon fibers is used as a reinforcing material and polypropylene is used as a matrix resin. As a method of forming, a flat sheet material in which polypropylene is impregnated and cured on carbon continuous fibers is obtained by first superposing a polypropylene film on 5 to 10 fabrics and pressing them while heating. The sheet material is so-called stamping molding in which the sheet material is heated and softened in a furnace, and then set in a mold and pressed.

  As shown in FIGS. 3 to 5, the reinforcing member 50 is attached from the front surface (occupant seating surface) side of the back pan 32 with the collar portion 51 facing forward and the convex portion 52 facing rearward. The convex portion 52 of the reinforcing member 50 is inserted into the through hole 36 from the front, and eventually the collar portion 51 comes into contact with the peripheral portion 36 c of the through hole 36 on the front side of the back pan 32. Here, the surface shape of the collar portion 51 corresponds to the surface shape of the peripheral edge portion 36c as described above. For this reason, the collar part 51 will be in the state which surface-contacted with respect to the peripheral part 36c. In this state, the collar portion 51 is bonded or welded to the peripheral edge portion 36c. For welding, for example, ultrasonic welding or vibration welding is used. Thereby, the reinforcing member 50 is attached to the back pan 32. Since the matrix resin of the reinforcing member 50 is the same polypropylene as the matrix resin of the back pan 32, the reinforcing raw material 50 and the resin material constituting the back pan 32 can be melted and integrated by heating.

  The back pad 33 is placed on the front surface (occupant seating surface) side of the back pan 32. The back pad 33 is made of urethane foam and functions as a cushion material that supports the weight of the seated person.

  The front side of the back pad 33 is covered with a back cover 34. A locking member 35 is attached to the end of the back cover 34. As shown in FIG. 5, in the back cover 34, the end of the back cover 34 is folded back along the folded portion 32 j of the back pan 32, and the locking member 35 is the folded portion 32 j and the main body of the back pan 32. It is fixed to the back pan 32 by being press-fitted into a groove formed between them. In FIG. 4, the locking member 35 is omitted for convenience of explanation. The back cover 34 is made of a jersey fabric that is breathable and easily stretchable.

  The present embodiment configured as described above has the following operational effects. The back pan 32 is formed by injection molding and has high productivity. A reinforcing member 50 is attached to the back pan 32. The reinforcing member 50 is formed by stamping and has high rigidity. Therefore, the back pan 50 can be made relatively inexpensive and highly rigid. Further, the flange portion 51 of the reinforcing member 50 is mounted on the front surface (occupant seating surface) side of the back pan 32. The front side of the back pan 32 is not visible from the outside because the back pad 33 is placed and covered with the back cover 34. For this reason, the collar part 51 of the reinforcing member 50 does not appear in the outer shape, and the appearance can be improved. At this time, since the collar part 51 is arrange | positioned inside the seat back 30 and cannot receive external force directly, peeling of the collar part 51 can be prevented. Further, the convex portion 52 of the reinforcing member 50 protrudes toward the rear surface of the back pan 32 (the surface opposite to the passenger seating surface). Therefore, the mounting space of the back pad 33 is not compressed, and the sitting comfort of the seated person is not deteriorated. Moreover, the convex part 52 of the reinforcement member 50 is extended in the left-right direction so that it may cross over both shoulders in the height position corresponding to a seated person's shoulder. Thereby, the bending rigidity in the left-right direction can be increased on the upper side of the back pan 32. Therefore, the head support performance at the time of a rear collision can be improved. Further, the same thermoplastic resin (polypropylene) is used as the matrix resin for the back pan 32 and the reinforcing member 50. For this reason, after attaching the reinforcing member 50 to the back pan 32, the resin material can be integrated.

  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, in the present embodiment, as the material of the back pan 32, a fiber reinforced plastic using carbon short fibers as a reinforcing material and polypropylene as a matrix resin is used. However, the present invention is not limited thereto, and glass fibers may be used for the reinforcing material, another thermoplastic resin such as polyamide may be used for the matrix resin, or a thermosetting resin such as a phenol resin may be used. In addition, as a reinforcing material, a plurality of woven fabrics made of continuous fibers such as carbon and glass may be used.

  In the present embodiment, as the material of the reinforcing member 50, a fiber reinforced plastic using the same thermoplastic resin (polypropylene) as the back pan 32 is used as a matrix resin, and a woven fabric made of continuous carbon fibers is used as a reinforcing material. did. However, the present invention is not limited to this. For example, a resin different from the back pan 32 may be used as the matrix resin. Moreover, you may use the planar member in which the continuous fiber is felt-like instead of the woven fabric of continuous fiber as a reinforcing material. Further, the reinforcing member 50 may be manufactured using metal parts instead of using fiber reinforced plastic. Even in this case, if the surface of the metal part is covered with a thermoplastic resin equal to the matrix resin of the back pan 32, the surface appearance can be integrated by the heat treatment after attachment.

  Further, in the present embodiment, as an example of the reinforcing member 50, the one in which the cross-sectional shape of the convex portion 52 of the reinforcing member 50 is formed in a substantially U shape is illustrated. However, the shape (cross-sectional hat shape) of the reinforcing member 50 is not limited to this. That is, for example, the cross-sectional shape of the convex portion 52 may be formed to be a substantially semicircular shape that protrudes rearward. Moreover, you may shape | mold so that the cross-sectional shape of the convex part 52 may become a triangle (substantially square shape) without a side which protrudes back.

  In the present embodiment, only one reinforcing member 50 is provided. However, the present invention is not limited to this, and two or more may be provided at appropriate positions.

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

10 Vehicle Seat 20 Seat Cushion 30 Seat Back 32 Back Pan (Seat Shell)
50 Reinforcing member 51 Collar portion 52 Convex portion

Claims (2)

A seat back or a seat cushion is a vehicle seat provided with a seat shell as a structure and a reinforcing member attached to the seat shell to reinforce the seat shell,
The seat shell is provided with a through hole that communicates the occupant seating surface side of the seat shell and the opposite surface side of the occupant seating surface,
The reinforcing member is formed in a cross-sectional hat shape, and a flange portion of the cross-sectional hat shape abuts on a peripheral edge portion of the through-hole on the passenger seating surface side of the seat shell, and the convex portion of the cross-sectional hat shape penetrates the through hole. A vehicle seat, wherein the vehicle seat is attached to the seat shell in a state of being disposed so as to protrude through the hole to the opposite side of the seating surface of the seat shell. The vehicle seat according to claim 1,
The seat back includes the seat shell;
The reinforcing member is attached to the seat shell in a state where the convex portion extends over both shoulder positions of the seat occupant at a height position corresponding to the seat occupant shoulder of the seat shell. A vehicle seat characterized by that.

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