Vehicle seat

Abstract

To further improve a fitting feeling for an occupant while securing holding performance for the occupant when a vehicle is turned.SOLUTION: In a vehicle seat in which a seat cover 6S forming a design surface is provided foamed integrally with a foamed resin-made seat pad 6P for elastically supporting an occupant and which includes a top-plate main portion 60 and a bank portion 61, a projection 64 projecting toward an inner side in a seat-width direction from a top-plate side portion 63 and also projecting toward a seated side from the top-plate main portion 60 is provided between the top-plate side portion 63 forming an inner side of the bank portion 61 in the seat-width direction and the top-plate main portion 60; and the projection 64 is provided with a facilitating unit (31, 32) that facilitates deformation caused by a load applied from the inner side in the seat-width direction and from the seated side.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle seat in which a seat cover forming a design surface is foamed integrally with a foamed resin seat pad that elastically supports an occupant. [Background technology]

[0002] A technology related to this type of vehicle seat is disclosed in Patent Document 1. In the vehicle seat of Patent Document 1, a seat cover forming the design surface is integrally foamed with a foamed resin seat pad that elastically supports the occupant. The vehicle seat also has a seat back that serves as a backrest for the occupant, and the seat back is provided with a top plate main part formed in the center of the seat width direction and a bank part that protrudes forward on the seat width direction outer side of the top plate main part. Here, the top plate main part is formed to extend in the seat width direction, and can support the occupant when the vehicle is traveling. In addition, the bank part has a portion on the inner side in the seat width direction as a top plate side part that extends to the front side of the seat while adjacent to the top plate main part. In the seat back, a gap that is difficult for the seated occupant to contact, that is, a triangular gap through which the seat pressure is released when the occupant is seated, is formed at the corner part between the top plate main part extending in the seat width direction and the top plate side part extending from the top plate main part to the front side of the seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-154805 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned vehicle seat, when the vehicle turns, the occupant supported by the main portion of the top plate is subjected to lateral G (lateral acceleration). In this case, the seat configuration described above ensures a fit to the occupant on the side of the top plate so that the occupant who receives the lateral G does not slip excessively. In order to further improve the fit, it is possible to provide some kind of structure to fill the triangular gap, but in such a case, consideration should be given to ensuring the holdability of the occupant. In other words, consideration should be given to preventing the back of the occupant from getting caught in the structure as much as possible, and a situation in which the occupant who receives the lateral G rotates excessively outward in the seat direction with the structure as a base point should be avoided as much as possible. The present invention has been devised in view of the above points, and the problem that the present invention is to solve is to further improve the fit to the occupant while ensuring the holdability of the occupant when the vehicle turns, etc. [Means for solving the problem]

[0005] As a means for solving the above problem, in the vehicle seat of the first invention, the seat cover forming the design surface is provided by being foamed integrally with a foamed resin seat pad that elastically supports the occupant. The vehicle seat also includes a top plate main portion extending in the seat width direction, and a bank portion that protrudes toward the seating side on the seat width direction outer side of the top plate main portion. In this type of seat configuration, it is desirable to improve the fit of the occupant while ensuring the holding ability for the occupant when the vehicle turns. Therefore, between the top plate side portion and the top plate main portion that form the seat width direction inner side of the bank portion of the present invention, a convex portion is provided that protrudes from the top plate side portion toward the seat width direction inner side and from the top plate main portion toward the seating side. The convex portion is provided with an accelerating portion that promotes deformation due to a load applied from the seat width direction inner side and the seating side. In the present invention, the seat cover is foamed integrally with the seat pad, making it difficult to apply tension to the seat cover, and thus it is easy to form a convex portion of a desired shape. When the vehicle turns, the occupant can be supported by the convex portion provided between the top side portion and the top main portion, improving the fit to the occupant. Also, the function of the promoting portion is to promote the deformation of the convex portion when a load (external force) is applied, reducing the reaction force of the convex portion on the occupant, thereby contributing to ensuring the hold on the occupant.

[0006] The vehicle seat of the second invention is the vehicle seat of the first invention, in which the ends of the seat cover part of the top plate main part and the seat cover part of the protruding part extend side by side to the back side of the seat opposite to the seating side, forming a retraction part. The retraction part is integrated with the seat pad in a state in which it gradually tilts inward in the seat width direction toward the back side of the seat, and the end sides of the seat covers forming the retraction part are connected in a center-outer shape via a connecting part to form an extension part. In this invention, by tilting the retraction part inward in the seat width direction, it is possible to make the length dimension of the retraction part embedded in the seat pad as large as possible. And by making the length dimension of the retraction part large, the connecting part, which is the base point of the bending deformation of the protruding part when a load is input, can be kept as far away as possible from the load input point of the protruding part.

[0007] The vehicle seat of the third invention is the vehicle seat of the first invention, in which the seat cover portion of the protrusion is separate from the seat cover portion of the side portion of the top plate, and the seat cover portion of the protrusion and the seat cover portion of the side portion of the top plate are connected via a connecting member. In this invention, the seat cover portion covering the protrusion is formed separately from the seat cover portion covering the side portion of the top plate. This makes it possible to more reliably position the seat cover portion covering the protrusion according to the shape of the protrusion.

[0008] The vehicle seat of the fourth invention is the vehicle seat of any one of the first to third inventions, in which an elastic layer is provided on the back side of the seat cover opposite the design surface side as an aiding part that is more elastically deformable than the seat pad. The thickness dimension of the elastic layer provided on the seat cover part of the convex part is made larger than the thickness dimension of the elastic layer provided on the seat cover part other than the convex part. In the present invention, the thick elastic layer for the convex part makes it easier to form a convex part of a desired shape. The elastic layer for the convex part that is relatively more easily deformed serves to more reliably deform the convex part to which a load is applied. Effect of the Invention

[0009] According to the first aspect of the present invention, it is possible to improve the fit of the seat to the occupant while ensuring the ability to hold the occupant when the vehicle turns, etc. According to the second aspect of the present invention, it is possible to more reliably ensure the ability to hold the occupant. According to the third aspect of the present invention, it is possible to more reliably ensure the fit of the seat to the occupant. And according to the fourth aspect of the present invention, it is possible to more reliably ensure the ability to hold the occupant and the fit of the seat to the occupant. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic perspective view of a vehicle seat. [Diagram 2] FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4]4 is a schematic enlarged cross-sectional view of a seat back showing a part of the cross section of FIG. 3 in an enlarged manner. FIG. [Diagram 5] 3 is a cross-sectional view taken along line VV in FIG. 2. [Figure 6] 4 is a schematic enlarged cross-sectional view of the seat back showing a retractable portion. FIG. [Figure 7] 4 is a schematic enlarged cross-sectional view of a seat back showing a protruding portion receiving a load; FIG. [Figure 8] 1 is a schematic cross-sectional view of a molding surface and a portion of a seat back. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 8. Figs. 1 to 7 appropriately show arrows indicating the front-rear direction, left-right direction (seat width direction), and up-down direction of the vehicle seat. For convenience, Fig. 1 shows the main components of the vehicle seat, and other components are partially shown by dashed double-dashed lines or are omitted. For convenience, Figs. 1 and 2 show reference characters corresponding to the respective parts of the left part of the vehicle seat, and reference characters corresponding to the respective parts of the right part are shown in parentheses.

[0012] [Vehicle seat overview] First, an overview of a vehicle seat 2 shown in Fig. 1 will be described. This vehicle seat 2 has, as seat constituent members, a seat cushion 4, a seat back 6, and a headrest 8. The lower part of the seat back 6 is connected to the rear part of the seat cushion 4 via a recliner R so that it can be raised or lowered, and the headrest 8 is disposed on the upper part of the seat back 6 in an upright position. Each of the members (4, 6, 8) as the seat constituent members has a seat frame (4F, 6F, 8F) that forms the seat skeleton, a seat pad (4P, 6P, 8P) that forms the seat outline, and a seat cover (4S, 6S, 8S) that covers the seat pad.

[0013] [Seat back] The seat back 6 shown in Figs. 1 and 2 is a generally rectangular member in front view on which the occupant rests, and includes the above-mentioned seat frame 6F, seat pad 6P, and seat cover 6S. As shown in Fig. 3, the seat back 6 has the seat cover 6S, which forms the design surface, foamed integrally with the seat pad 6P on the seat frame (not shown). In addition, the front side of the seat back 6, which is the seating side, is formed with a top plate main part 60 extending in the seat width direction (left and right), and a bank part 61 protruding toward the seating side on the outer side (left side) of the top plate main part 60 in the seat width direction. Here, the top plate main part 60 is provided in the center of the seat back 6 in the seat width direction, and is capable of supporting the occupant during normal driving, etc. In addition, the outer part of the bank part 61 in the seat width direction is a gusset part 62 that forms the side surface of the seat. The inner (right) portion of the bank portion 61 in the seat width direction constitutes a top plate side portion 63, and this top plate side portion 63 is capable of supporting the sides of the occupant.

[0014] In the above-described seat back 6, when the vehicle turns, the occupant X supported by the top panel main portion 60 receives lateral G-forces and is thus likely to move outward in the seat width direction (left side) as shown in FIG. 3. For this reason, in the seat back 6, the top panel side portion 63 ensures a good fit for the occupant X, and the protruding portion 64 described later functions to further improve the good fit. In the above-described configuration, from the viewpoint of ensuring the holding ability for the occupant X, care should be taken to ensure that the back side of the occupant X is not caught by the protruding portion 64 as much as possible when the occupant X receives lateral G-forces. Therefore, in the vehicle seat 2 of this embodiment, the configuration of the protruding portion 64 described later ensures the holding ability for the occupant X while further improving the good fit for the occupant X.

[0015] In the seat back 6 shown in Fig. 2, a top plate main part 60, a bank part 61 (top plate side part 63), and a protruding part 64 are provided on both sides (right and left) in the seat width direction. The left and right components of the seat back 6 have substantially the same basic configuration. As shown in Fig. 1, the seat cushion 4 described later also has substantially the same configuration as the seat back 6 (top plate main part 40, top plate side part 43 of bank part 41, and protruding part 44). Hereinafter, the left part of the seat back 6 will be taken as an example, and the details of the seat pad 6P, the seat cover 6S, and the protruding part 64 will be described in this order.

[0016] [Seat pad] First, the seat pad 6P shown in FIG. 3 is a foamed resin member that elastically supports the occupant as described above. Examples of materials for this type of seat pad 6P include various foamed resins such as polyurethane foam, polystyrene foam, and polypropylene foam. The seat pad 6P desirably has a suitable hardness (40% compression hardness) in consideration of the support for the occupant as well as a suitable elasticity. The hardness of this seat pad 6P (and the elastic layer described below) can be measured, for example, in accordance with JIS K 6400-2. The hardness of the seat pad 6P is not particularly limited as long as it can ensure the support for the occupant, but it is preferable that the hardness be, for example, 400N / 314cm. 2 ~600N / 314cm 2 The range is preferably set to 450N / 314cm. 2 ~550N / 314cm 2 It can be set in the range.

[0017] [Seat cover] Next, the seat cover 6S shown in FIG. 3 is a surface material that constitutes the design surface of the seat as described above. Examples of materials for this type of seat cover 6S include fabrics (woven fabrics, knitted fabrics, nonwoven fabrics) made of natural fibers or synthetic fibers and leather (natural leather, synthetic leather). The seat cover 6S can also be made of a single surface material, but in this embodiment, it is formed of a plurality of skin pieces 11 to 13, etc. (for convenience, in FIG. 3, specific skin pieces are given specific reference numbers 11 to 13, and the reference numbers of the other skin pieces are omitted). That is, the seat cover 6S is formed by sewing together adjacent ends of a first skin piece 11 for the top panel main part, a second skin piece 12 for the top panel side part, and a third skin piece 13 for a protruding part described later. In the front view of the seat back 6 shown in Fig. 2, the first skin piece 11 extends in the vertical direction with a moderate seat width dimension (width dimension), and the second skin piece 12 extends in the vertical direction with a slightly narrower width. The third skin piece 13 extends in the vertical direction between the first skin piece 11 and the second skin piece 12 with a slightly narrower width. The third skin piece 13 is arranged in a portion from the lower end to the upper side of the adjacent other skin pieces (11, 12) by making the vertical length dimension slightly short.

[0018] [Elastic layer] The seat cover 6S shown in FIG. 3 is provided with elastically expandable elastic layers (14-16, etc.) on the back side opposite to the design side. For example, referring to FIG. 4, the first skin piece 11 is provided with a first elastic layer 14, the second skin piece 12 is provided with a second elastic layer 15, and the third skin piece 13 is provided with an elastic layer 16 for the protruding portion. These elastic layers 14-16, etc. are formed in a mat shape (flat shape) and are integrated with the back side of the seat cover 6S in an overlapping state. Examples of materials for this type of elastic layers 14-16, etc. include slab urethane and various foam materials similar thereto. The elastic layers 14-16, etc. are made softer than the seat pad 6P, so that they are easily elastically deformed when a load is applied. That is, the hardness of the elastic layers 14-16, etc. is set to be less than the hardness of the above-mentioned seat pad 6P, for example, a hardness of 40N / 314cm. 2~200N / 314cm 2 The range is preferably set to 40N / 314cm. 2 ~150N / 314cm 2 It can be set in the range.

[0019] [Method of integrating seat pad and seat cover] The seat cover 6S shown in Figs. 3 and 4 is foamed and fixed to the seat pad 6P. The seat pad 6P is formed by foaming and hardening a resin material in a mold (not shown). Therefore, before foaming, the seat cover 6S with as little tension as possible is placed on the molding surface of the mold (see the molding surface 100 shown in Fig. 8), and the resin material is foamed and hardened in this state. According to the above-mentioned manufacturing method, the resin material of the seat pad 6P is appropriately impregnated into the elastic layers 14 to 16 of the seat cover 6S and hardened, and the seat cover 6S can be foamed and integrated with the seat pad 6P. According to the above-mentioned manufacturing method, the seat cover 6S can be integrated with the seat pad 6P with as little tension as possible.

[0020] [Convex] Next, a convex portion 64 is formed between the top plate side portion 63 and the top plate main portion 60 shown in FIG. 1 and FIG. 2. As shown in FIG. 3, the convex portion 64 is formed so as to protrude from the top plate side portion 63 toward the inside in the seat width direction (right side) and from the top plate main portion 60 toward the seating side (front side). Here, the shape of the convex portion 64 is not particularly limited, but in this embodiment, the outer shape is formed in an arc shape and protrudes toward the inside in the seat width direction and toward the seating side. The convex portion 64 is formed between the top plate side portion 63 and the top plate main portion 60, and is arranged so as to fill the corner portion (triangular gap) that would have been generated between the top plate side portion 63 and the top plate main portion 60. The convex portion 64 is formed so as to extend in the vertical direction following the third skin piece 13 as shown in FIG. 2, and a first region 641 is provided on the lower side thereof, and a second region 642 is provided on the upper side thereof. In a first region 641 provided on the lower side of the protruding portion 64 shown in Fig. 3, the dimension of the protruding portion 64 in the seat width direction is relatively large, thereby ensuring a good fit and holding ability (described in detail later) for the occupant's waist and the like. In a second region 642 provided on the upper side of the protruding portion 64 shown in Fig. 5, the dimension of the protruding portion 64 in the seat width direction is relatively small. This ensures that the movement of the occupant's arms and the like is not hindered by the protruding portion 64 as much as possible, thereby contributing to ensuring the operability of the vehicle (for example, the operability of the steering wheel).

[0021] The design surface of the protruding portion 64 is formed by the third skin piece 13 shown in FIG. 4. The third skin piece 13 is arranged to form a convex curved surface in cross section following the external shape of the protruding portion 64. In the vehicle seat 2, the rear end of the third skin piece 13 is sewn to the left end of the first skin piece 11 of the top panel main portion 60 via an institch ST1 (connecting portion 21), thereby forming a retracted portion 20 described later. The front end of the third skin piece 13 is sewn to the rear end of the second skin piece 12 of the top panel side portion 63 in a center-outer shape via another institch ST2 (connecting member 22). In the above-mentioned configuration, the third skin piece 13 (seat cover portion of the protruding portion) is formed separately from the other seat cover portions (particularly the second skin piece 12), so that the third skin piece 13 can be arranged in a convex curved surface shape without being affected as much as possible by the three-dimensional shapes of the other seat cover portions. This allows the third skin piece 13 to be positioned along the protrusion 64 with good finish over substantially the entire area of ​​the protrusion 64 in the vertical direction, which contributes to ensuring an excellent design of the seat.

[0022] In addition, in the protruding portion 64 shown in FIG. 4, the elastic layer 16 for the protruding portion provided on the back side of the third skin piece 13 is thicker than the elastic layers (14, 15, etc.) provided in the seat cover portion other than the protruding portion. That is, the thickness dimension T1 of the elastic layer 16 for the protruding portion is the thickest among all the elastic layers, and is set to be larger than the thickness dimension T2 of the elastic layer 14 on the top plate main portion side and the thickness dimension T3 of the elastic layer 15 on the top plate side side. Here, the ratio of the thickness dimensions between the elastic layers is not particularly limited, but when the thickness dimension of the elastic layer 14 of the top plate main portion 60 is 1, the thickness dimension of the elastic layer 16 for the protruding portion can be set to 1.2 or more, and is preferably 1.5 or more. The elastic layer 16 for the protruding portion is for forming the shape of the protruding portion 64 together with the seat pad 6P, and also has the function of promoting the deformation of the protruding portion 64. That is, the elastic layer 16 for the convex portion constitutes an accelerating portion 31 that accelerates the deformation of the convex portion 64 due to the load applied from the inside (right side) in the seat width direction and from the seating side (front side). In the above-mentioned configuration, it is desirable to be able to prevent unintended crushing (compressive deformation) of the elastic layer 16 for the convex portion as much as possible in the convex portion 64 in a free state where no load is applied. Therefore, in the convex portion 64, the third skin piece 13 is in a state where tension is applied as little as possible by the foaming and integration described above. This allows the third skin piece 13 to be arranged along the convex portion 64 without crushing the elastic layer 16 for the convex portion as much as possible.

[0023] [Retract section] The recess 20 shown in Fig. 6 is formed by the rear end of the third skin piece 13 and the left end of the first skin piece 11 as described above. The rear end of the third skin piece 13 and the left end of the first skin piece 11 are adjacent to each other in the recess 20, and the recess 20 extends to the back side of the seat (the rear side in the figure) opposite the seating side. The two skin pieces 11, 13 gradually approach each other toward the back side of the seat, so that a groove-like portion is provided between the top plate main portion 60 and the protruding portion 64. The recess 20 forms another extension portion 32 by connecting the ends (11E, 13E) of the skin pieces in a center-surface manner via the institch ST1 (connecting portion 21). That is, as described later, the institch ST1 forming the connecting portion 21 is the base point when the convex portion 64 is flexed and deformed when a load is applied, and the further away this institch ST1 is from the load input point (described in detail later), the easier it is for the convex portion 64 to flex and deform. For this reason, the retraction portion 20 is integrated with the seat pad 6P in a state in which it is gradually tilted inward in the seat width direction toward the back side of the seat. By tilting the retraction portion 20 in this way and ensuring its length, it is possible to keep the load input point of the convex portion 64 (described later) and the institch ST1 (connecting portion 21) as far away as possible.

[0024] Here, the inclination degree of the retraction portion 20 shown in FIG. 6 is not particularly limited as long as the retraction portion 20 can be embedded and integrated into the seat pad 6P having a predetermined thickness while securing the length dimension of the retraction portion 20. Here, the thickness of the seat pad 6P can be set based on, for example, the average thickness of the seat pad 6P portion on the top plate main portion 60 side (see the thickness of the seat pad indicated by the symbol T0 in FIG. 3). The inclination degree of the retraction portion 20 can be determined by the inclination angle θ of the third skin piece 13 with respect to a virtual straight line L1, which is assumed to extend in the front-rear direction while being perpendicular to the seat width direction (left-right direction) based on the cross-sectional view shown in FIG. 6. The inclination angle θ of the third skin piece 13 can be set to 5° or more and less than 90°, and it is more preferable to set it to 10° or more and less than 90°. By setting the inclination angle θ within the range described above, the retraction portion 20 can be embedded and integrated into the seat pad 6P more reliably while securing its length dimension. The inclination angle of the third skin piece 13 can also be determined by the inclination angle (θ) of the molding surface portion (the molding surface portion indicated by reference numeral 101 in FIG. 8) on which the third skin piece 13 is placed in the mold.

[0025] The upper limit of the inclination angle θ of the third skin piece 13 shown in FIG. 6 can be set to a value less than 90°, but from the viewpoint of ensuring the finish quality of the seat cover 6S, the upper limit can be set to 50° or less, and more preferably to about 30°. Here, the seat cover 6S is foamed integrally with the seat pad 6P as described above, and then is removed from the mold (see FIG. 8). At this time, the retracted portion 20 (the portion on the first skin piece 11 side) is removed from the mold part (the molding surface part shown by reference numeral 101 in FIG. 8) that forms the retracted portion 20 while being bent. At this time, the larger the inclination angle θ, the more the inwardly folded portion of the first skin piece 11 and the third skin piece 13 overlap, and the thicker skin part is more likely to develop wrinkles due to the bending during removal. Therefore, by setting the upper limit of the inclination angle θ to the above value, it is possible to avoid excessive overlap between the skin pieces, which contributes to ensuring the finish quality of the seat cover 6S.

[0026] 3, assuming that there is an imaginary inclination line L2 overlapping with the retraction portion 20, the projection dimension of the convex portion 64 toward the inside (right side) in the seat width direction relative to the top plate side portion 63 can be set based on the imaginary inclination line L2. For example, from the viewpoint of improving the fit, at least a part of the convex portion 64 can be formed so as to be at approximately the same position as the imaginary inclination line L2 or to project toward the inside in the seat width direction from there. The lower end side of the convex portion 64 shown in FIG. 3 is disposed at approximately the same position as the imaginary inclination line L2.

[0027] [Occupant behavior when turning a vehicle] In the above-mentioned seat configuration, when the vehicle turns, the occupant X supported by the top panel main part 60 shown in FIG. 3 receives lateral G-forces. In this type of configuration, it is desirable to improve the fit of the occupant X while ensuring the holding ability of the occupant X as described above. Therefore, in the vehicle seat 2, a convex part 64 is provided between the top panel side part 63 and the top panel main part 60, which protrudes from the top panel side part 63 to the inside in the seat width direction (right side) and protrudes from the top panel main part 60 to the seating side (front side). The convex part 64 is provided with an assisting part (31, 32) that assists deformation due to a load applied from the inside in the seat width direction and the seating side. In the above-mentioned configuration, the occupant X is supported by the convex part 64 between the top panel side part 63 and the top panel main part 60 when the vehicle turns. At this time, the promoting portions (31, 32) act to promote the deformation of the convex portion 64 to which a load is applied, thereby making it possible to reduce the reaction force of the convex portion 64 against the occupant X. Hereinafter, the functions of the convex portion 64 and the promoting portions (31, 32) will be described in more detail.

[0028] [Function of the protruding part] First, the convex portion 64 shown in Fig. 3 and Fig. 4 protrudes from the top plate side portion 63 toward the inside in the seat width direction (right side) and from the top plate main portion 60 toward the seating side (front side) as described above. This allows the convex portion 64 to fill the triangular gap that would otherwise be generated between the top plate side portion 63 and the top plate main portion 60, making it possible to minimize the occurrence of a location where the seating pressure is lost when the occupant is seated. When the occupant X (lower back, etc.) supported by the top plate main portion 60 receives lateral G, the occupant X who is about to slip sideways is first supported by the convex portion 64. According to the above-mentioned configuration, the function of the convex portion 64 can further improve the fit to the occupant X, and excessive sideways slippage of the occupant X when the vehicle turns, etc. can be suppressed.

[0029] [Work of the Promotion Department] 4 and 7, when the convex portion 64 is pressed against the occupant X who receives the lateral G force, the load F1 is applied to the convex portion 64 from the inside (right side) in the seat width direction and the seating side (front side). Here, the load F1 is applied to the convex portion 64 at a portion closer to the seating side than the left end (the portion that is the inward folding base point of the first skin piece that forms the retracted portion) of the adjacent top plate main portion 60, particularly to the front portion of the convex portion 64, and this portion becomes the load input portion of the convex portion 64. In the convex portion 64, the elastic layer 16 for the convex portion (promoting portion 31), which is easy to elastically deform and thick, is provided on substantially the entire back side of the third skin piece 13. Therefore, when the load F1 is applied to the convex portion 64, the elastic layer 16 for the convex portion elastically deforms so as to be crushed, thereby reducing the reaction force of the convex portion 64 applied to the occupant X. In addition, the protruding portion 64 to which the load F1 is applied is deformed outward in the seat width direction (left side) and toward the back side of the seat (rear side) with the institch ST1 as the connecting portion 21 provided in the retracted portion 20 (another promoting portion 32) as a base point. At this time, in the seat back 6, the retracted portion 20 is arranged diagonally toward the inward in the seat width direction and toward the back side of the seat, so that the connecting portion 21 is arranged as far away as possible from the load input point of the protruding portion 64. In this way, by keeping the connecting portion 21, which is the base point of the deformed deformation, as far away as possible from the load input point, the protruding portion 64 to which the load F1 is applied can be deformed largely, and the reaction force of the protruding portion 64 applied to the occupant X can be further reduced. In the above-mentioned configuration, the promoting portions 31 and 32 work to reduce the reaction force of the protruding portion 64 against the occupant X, so that the back side of the occupant X is less likely to get caught on the protruding portion 64. Therefore, according to the above-described configuration, it is possible to prevent, as much as possible, a situation in which an occupant subjected to lateral G-forces rotates excessively outward in the seat direction with the protruding portion 64 as a base point.

[0030] [Seat cushion] In the vehicle seat 2 shown in FIG. 1, the seat cushion 4 serving as the seat portion has a seat frame 4F for the seat cushion, a seat pad 4P, and a seat cover 4S, similar to the seat back 6. The seat cushion 4 is formed with a top plate main portion 40, a bank portion 41 (a ridge portion 42 and a top plate side portion 43) for the seat cushion, and another protruding portion 44 on both sides (right and left) in the seat width direction. This allows the seat cushion 4 to improve the fit to the occupant while ensuring the holding ability for the occupant (especially the buttocks) when the vehicle turns. In the seat cushion 4, the dimension of the other protruding portion 44 in the seat width direction is made large on the rear side (another first region 441), so that the fit and holding ability for the occupant's buttocks are ensured. In addition, the dimension of the other protruding portion 44 in the seat width direction is made small on the front side (another second region 442) of the other protruding portion 44. This ensures that the movement of the passenger's legs and the like is not hindered by other protrusions 44 as much as possible, which contributes to ensuring the operability of the vehicle (for example, the operability of the pedals).

[0031] As described above, in this embodiment, the seat cover 6S is foamed integrally with the seat pad 6P, and tension is less likely to be applied to the seat cover 6S, making it easier to form the convex portion 64 in a desired shape. The convex portion 64 provided between the top plate side portion 63 and the top plate main portion 60 can receive the occupant when the vehicle turns, and the fit to the occupant can be improved. In addition, the function of the promoting portions 31 and 32 promotes the deformation of the convex portion 64 to which a load is applied, thereby reducing the reaction force of the convex portion 64 applied to the occupant, thereby contributing to ensuring the holdability to the occupant. Therefore, according to this embodiment, the fit to the occupant can be improved while ensuring the holdability to the occupant when the vehicle turns, etc.

[0032] Furthermore, in this embodiment, the retraction portion 20 is inclined toward the inside in the seat width direction, so that the length dimension of the retraction portion 20 embedded in the seat pad 6P can be made as large as possible. By making the length dimension of the retraction portion 20 large, the connection portion 21, which is the base point of the bending deformation of the convex portion 64 when a load is input, can be kept as far away as possible from the load input point of the convex portion 64. In this embodiment, the seat cover portion (third skin piece 13) that covers the convex portion 64 is formed separately from the seat cover portion (second skin piece 12) that covers the top plate side portion 63. This makes it possible to more reliably position the seat cover portion (third skin piece 13) that covers the convex portion 64 along the shape of the convex portion 64. In this embodiment, the thick elastic layer 16 for the convex portion makes it easier to form the convex portion 64 in a desired shape. The elastic layer 16 for the convex portion, which is relatively easy to deform, acts to more reliably bend and deform the convex portion 64 to which a load is applied.

[0033] The vehicle seat of this embodiment is not limited to the above-mentioned embodiment, and may take various other embodiments. In this embodiment, the configuration of the convex portion is exemplified, but the configuration of the convex portion is not limited. For example, the shape of the convex portion may be formed in an arc shape, or may take various shapes such as a square shape. The outer shape of the convex portion may be a mountain shape with the apex at the front, in which case the convex portion becomes relatively easier to deform toward the front side. In this case, the shape of the convex portion constitutes the promoting portion. The convex portion may have at least one of the following promoting portions: a thick elastic layer for the convex portion, a configuration in which the base point of the bending deformation of the convex portion 64 is separated as much as possible, and a configuration in which the shape of the convex portion is devised. In addition, the retracted portion does not necessarily need to be inclined, and when the seat pad has a sufficient thickness, it can be extended to the back side of the seat in the same direction as the virtual straight line L1 shown in FIG. 6. In addition, the convex portion may have one elastic layer for the convex portion, or may have multiple elastic layers stacked together. When a plurality of elastic layers are provided, the total thickness of the elastic layers can be regarded as the thickness of the elastic layer for the protrusions. When the thickness of the elastic layers varies partially, the average thickness can be used as the standard.

[0034] The configuration of the seat back and the seat cushion can also be changed as appropriate, and the configuration of this embodiment can be provided to at least one of the seat back and the seat cushion. The headrest can also be omitted as necessary. The configuration of the main top plate, the convex portion, and the bank portion of the seat back and the seat cushion can also be changed as appropriate, and the configuration of this embodiment can be provided to at least one of both sides (right and left) in the width direction of the seat. The width dimension of the convex portion may be approximately the same in the vertical direction or the front-rear direction of the seat, or may be different (multiple regions may be provided). The configuration of this embodiment can be applied to all vehicle seats, such as those for cars, airplanes, trains, and ships. [Explanation of symbols]

[0035] 2 Vehicle seats 4 Seat cushion 6 Seat back 8 Headrest R recliner 6F Seat frame (for seat back) 6P Seat Pad (for Seat Back) 6S Seat cover (for seat back) 11 First skin piece (seat cover part of the main top panel) 12 Second skin piece (seat cover part on the side of the top panel) 13 Third skin piece (protruding seat cover part) 14 First Elastic Layer 15 Second Elastic Layer 16 Elastic layer for convex parts 20 Retraction section 21 Connecting part 22 Connecting members 31 Promotion Department 32 Another Promotion Department 60 (for seat back) Top plate main section 61 (Seat back) bank 62 (For seat back) 63 (Seat back) Top panel side part 64 (for seat back) protrusion 641 First area (for seat back) 642 Second area (for seat back) ST1 Institch ST2 Alternative institch 4F Seat frame (for seat cushion) 4P seat pads (for seat cushions) 4S Seat cover (for seat cushion) 40 Main part of top plate (for seat cushion) 41 (for seat cushion) bank 42 (For seat cushion) Kamachi part 43 (Seat cushion) top side 44 Another protrusion (for seat cushion) 441 Another First Region 442 Another Second Area X Crew

Claims

1. A vehicle seat in which a seat cover forming a design surface is foamed integrally with a foamed resin seat pad that elastically supports an occupant, the vehicle seat having a top plate main portion extending in the seat width direction, and a bank portion protruding toward the seating side on the outer side of the top plate main portion in the seat width direction, A convex portion is provided between the table top side portion that is on the inner side of the bank portion in the seat width direction and the table top main portion, the convex portion protruding from the table top side portion toward the inner side in the seat width direction and protruding from the table top main portion toward the seating side, The vehicle seat has a promoting portion provided on the convex portion, which promotes deformation due to a load applied from the seating side and on the inner side in the seat width direction.

2. The end portions of the seat cover portion of the top plate main portion and the seat cover portion of the protruding portion are adjacent to each other and extend to the back side of the seat opposite to the seating side to form a retractable portion, The vehicle seat of claim 1, wherein the retraction portion is integrated with the seat pad in a state in which it gradually tilts inward in the seat width direction as it approaches the back side of the seat, and the end sides of each seat cover constituting the retraction portion are connected in an inward-outward manner via a connecting portion to form the extension portion.

3. 2. The vehicle seat according to claim 1, wherein the seat cover portion of the convex portion is separate from the seat cover portion of the top plate side portion, and the seat cover portion of the convex portion and the seat cover portion of the top plate side portion are connected via a connecting member.

4. An elastic layer serving as the promoting portion, which is more elastically deformable than the seat pad, is provided on a back side of the seat cover opposite to the design surface side, The vehicle seat according to any one of claims 1 to 3, wherein a thickness dimension of the elastic layer provided in the seat cover portion of the convex portion is greater than a thickness dimension of the elastic layer provided in the seat cover portion other than the convex portion.

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