JP6432981B2 - Seat pan structure - Google Patents

Description

  The present invention relates to a seat pan structure of a seat pan that is disposed below a cushion material in a seating portion of a seat and supports a load acting on the seating portion.

  A seat pan 100 as shown in FIG. 9 is disposed below the cushioning material in the seat portion of the automobile seat, and a load acting on the seat portion is supported by the seat pan 100. For this reason, the seat pan 100 is required to have high rigidity and is made of a metal such as iron (see Patent Documents 1 and 2).

JP 2014-177184 A Japanese Patent Laid-Open No. 9-52581

  In recent years, there has been a demand for lighter vehicles for the purpose of improving the fuel consumption of automobiles. In order to respond to this request, it is assumed that the above-described sheet pan 100 is made of a resin material. In this case, the assumed sheet pan 110 made of resin (FIG. 10) has the same thickness as that of the metal sheet pan 100, whereas the thickness of the metal sheet pan 100 is, for example, 0.95 mm. In addition, a thick wall structure having a thickness N of, for example, 3.5 mm is formed, and a rib portion 112 is formed so as to protrude from the flat plate portion 111 at a location where the generated stress increases.

  As described above, since the assumed sheet pan 110 has a thick structure, the heat storage amount (heat accumulation) at the time of molding is large, the cooling time at the time of molding becomes long, and the manufacturing cost increases. Furthermore, in the assumed sheet pan 110, since the heat storage amount at the time of molding is large as described above, the shrinkage difference at the time of cooling is increased, and the assumed sheet pan 110 is reduced in dimensional accuracy.

  The object of the present invention has been made in consideration of the above-described circumstances, and can achieve weight reduction while ensuring the rigidity of the seat pan. Further, the cooling time at the time of forming the seat pan can be shortened, An object of the present invention is to provide a seat pan structure capable of improving dimensional accuracy.

The seat pan structure according to the present invention is a seat pan structure in which a seat pan that is disposed below a cushion material in a seating portion of a seat and supports a load acting on the seating portion is formed of a resin material, The seat pan is formed by integrally forming a frame-shaped frame portion provided around and a base surface portion provided in a substantially planar shape inside the frame portion, and the base surface portions are concentrically arranged adjacent to each other. a plurality of mountain-shaped portions with each arranged to intersect with these mountain-shaped portion is configured to have a plurality of first cross-rib and the second cross rib, the said first cross rib, In the plan view of the base surface portion, a plurality of radially extending from the center position of the concentric circle is formed, and the second intersecting rib is bent in an L shape in the plan view of the base surface portion, and the bent portion is Concentric Positioned toward the heart position, and characterized by being formed by a plurality of arranged at predetermined intervals and intersect the bent portion of the first cross-rib.

  According to the present invention, since the seat pan is made of a resin material, the weight of the seat pan can be reduced. In addition, the base surface portion is configured by a plurality of cross-shaped ribs intersecting and arranged in a plurality of concentric circularly adjacent portions, and the chevron-shaped portions have strength against a horizontal load. In addition, the cross ribs have strength against vertical loads. For this reason, even if the base surface portion has a thin structure, it is possible to secure the rigidity, and thus the rigidity of the seat pan.

  In addition, the base surface portion can be configured in a thin structure, and further, the base surface portion is configured by intersecting a plurality of mountain-shaped portions with a plurality of intersecting ribs, resulting in a vertically uneven shape and an increased cooling area. Coolability of the base surface portion during sheet pan molding is excellent, and cooling time during sheet pan molding can be shortened.

  In addition, since the base surface can be configured with a thin structure, heat buildup during sheet pan molding can be reduced. As a result, the shrinkage difference of the base surface during cooling of the seat pan molding is reduced, improving the dimensional accuracy of the seat pan. it can.

The side view which shows the seat pan with which one Embodiment of the seat pan structure which concerns on this invention was applied with the seat for motor vehicles . The perspective view which shows the seat pan of FIG. The perspective view which expands and shows a sheet surface part partially except the orthogonal rib of FIG. The perspective view which expands and shows a part of FIG. 3 further. Sectional drawing which follows the VV line | wire of FIG. Explanatory drawing explaining the stress which each arises by the load P1, P2, and P3 which acts on the sheet | seat surface part and orthogonal rib of FIG. The schematic diagram which shows the temperature distribution at the time of sheet-pan shaping | molding of FIG. The graph which shows the temperature change of the thickness center in A site | part of FIG. 7, and B site | part of FIG. The perspective view which shows the conventional metal sheet | seat pan. Explanatory drawing explaining the stress which arises by the load P1, P2, and P3 which act on the assumption sheet pan, when the assumption sheet pan made from the resin of the substantially same shape which has a rigidity comparable as the metal sheet pan of FIG. 9 is manufactured. . The schematic diagram which shows the temperature distribution at the time of shaping | molding of the resin-made assumption sheet | seat pan in FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a seat pan to which an embodiment of a seat pan structure according to the present invention is applied together with an automobile seat, and FIG. 2 is a perspective view showing the seat pan of FIG. As shown in FIG. 1, the vehicle seat 10 is provided with a backrest 12 and a headrest 13 at the back of a seating portion 11. The seating portion 11 is a cushioning material 14 and a seat pan disposed below the cushioning material 14. 15. The load acting on the seating portion 11 is supported by the seat pan 15 via the cushion material 14. Further, the seating portion 11 is provided so as to be rotatable about an axis Q in the vehicle width direction, and allows an article to be taken into and out of the luggage storage chamber 16 formed below the seat pan 15.

  As shown in FIG. 2, the seat pan 15 includes a frame-shaped frame portion 21 provided in the periphery, a substantially planar base surface portion 22 provided inside the frame portion 21, and a width of the seat pan 15. An orthogonal rib 23 provided upright on the base surface portion 22 at a central position in the direction (x direction) is integrally formed of a resin material. Here, the resin material is preferably a composite resin in which, for example, about 20% of long fiber glass is contained in polypropylene (PP). However, several tens of percent of carbon fiber may be used instead of long fiber glass.

As shown in FIGS. 2 and 3, the base surface portion 22 intersects with a plurality of mountain-shaped portions 24 arranged concentrically adjacent to each other, and as shown in FIGS. 3 and 4, these mountain-shaped portions 24 intersect. In addition, a plurality of first intersecting ribs 25 arranged radially extending from the center position O of the concentric circle of the chevron-shaped part 24 in the base surface portion 22, and a plurality of first intersecting ribs 25 intersecting the plurality of chevron-shaped parts 24 And second cross ribs 26 arranged obliquely. As shown in FIG. 4 and FIG. 5, the ramen lath structure is configured by the mountain-shaped portion 24, the first intersecting rib 25 and the second intersecting rib 26.

  The plurality of mountain-shaped portions 24 have strength against loads in the horizontal direction (x direction and y direction), and the plurality of first intersecting ribs 25 and second intersecting ribs 26 are subjected to loads in the vertical direction (z direction). It has strength against it. Therefore, the sheet surface portion 22 can ensure rigidity even if it is configured to have a thin structure. For example, the thickness T0 of the mountain-shaped portion 24, the thickness T1 of the first intersecting rib 25, and the thickness T2 of the second intersecting rib 26 are all set to 0.7 to 1.0 mm.

  Further, as shown in FIGS. 2 and 6, the orthogonal rib 23 extends in the front and rear direction (y direction) of the seat pan 15 at the center position in the width direction (x direction) of the seat pan 15 in the seat surface portion 22. , And is provided upright on the seat surface portion 22. One or a plurality (three in the present embodiment) of the orthogonal ribs 23 are arranged in parallel in the front-rear direction of the seat pan 15. The orthogonal rib 23 has a strength against a twist M around an axis K in the front-rear direction (y direction) of the seat pan 15, although the thickness T3 is set to be as thin as 1.5 to 2.0 mm. The presence of the orthogonal ribs 23 further increases the rigidity of the seat pan 15.

  On the other hand, in the assumed sheet pan 110 (FIG. 11) assumed to have the same rigidity as the conventional metal sheet pan 100 (FIG. 9), the thickness of the metal sheet pan 100 is, for example, 0. The thickness N of the flat plate portion 111 and the rib portion 112 connected to each other is set to 3.5 mm, for example. The assumed sheet pan 110 is set to the above-described thickness N, and the rib portion 112 is formed at a portion where stress is generated in the flat plate portion 111, so that rigidity equivalent to that of the metal sheet pan 100 can be secured.

  Here, as shown in FIGS. 6 and 10, the stress generated when loads P1, P2, and P3 are respectively applied to the seat pan 15 and the assumed seat pan 110 of the present embodiment will be considered.

  As shown in FIG. 6, when a load P1 is applied to an arbitrary position of the orthogonal rib 23 of the seat pan 15 of the present embodiment, stress (x direction stress component σTx1, y direction stress component σTy1, z direction) is applied to this position. A stress component σTz1) is generated. Further, when the load P2 is applied to an arbitrary position where the second intersecting ribs 26 of the base surface portion 20 of the seat pan 15 intersect, stress (x direction stress component σTx2, y direction stress component σTy2, z) is applied to the intersected position. A directional stress component σTz2) is generated. Further, when a load P3 is applied to an arbitrary position where the first intersecting rib 25 and the second intersecting rib 26 intersect on the sheet surface portion 22 of the seat pan 15, stress (x direction stress component σTx3, y direction) is applied to the intersected position. Stress component σTy3 and z-direction stress component σTz3) are generated.

  On the other hand, as shown in FIG. 11, when a load P1 is applied to an arbitrary position of the rib portion 112 of the assumed seat pan 110, stress (x direction stress component σLx1, y direction stress component σLy1, z direction stress component) is applied to this position. σLz1) occurs. Further, when the load P2 is applied to an arbitrary position on one side of the flat plate portion 111 of the assumed sheet pan 110 with respect to the rib portion 112, stress (x direction stress component σLx2, y direction stress component σLy2, z direction stress) is applied to this position. The component σLz2) is generated. Further, when a load P3 is applied to an arbitrary position on the other side of the rib portion 112 in the flat plate portion 111 of the assumed sheet pan 110, stress (x-direction stress component σLx3, y-direction stress component σLy3, z-direction stress) is applied to this position. The component σLz3) is generated.

  Between the above-mentioned stress components, there is a relationship of σTx1 = σLx1; σTy1 = σLy1; σTz1 = σLz1 with respect to the load P1. Accordingly, the stresses generated in the thin orthogonal ribs 23 of the seat pan 15 and the thick rib portions 112 of the assumed seat pan 110 are equal, and the strengths of both (the orthogonal ribs 23 and the rib portions 112) are equal. It turns out that it is.

  Further, the stress components described above have a relationship of σTx2 = σLx2; σTy2 = σLy2; σTz2 = σLz2 with respect to the load P2, and a relationship of σTx3 = σLx3; σTy3 = σLy3; σTz3 = σLz3 with respect to the load P3. . From these things, the stress which generate | occur | produces in the base surface part 22 (the mountain-shaped part 24, the 1st crossing rib 25, and the 2nd crossing rib 26) of the seat pan 115 and the thick flat plate part 111 of the assumption seat pan 110, respectively. It becomes equal and it turns out that the intensity | strength of both (the sheet | seat surface part 22 and the flat plate part 111) is equivalent.

  For these reasons, even if the seat pan 15 in the present embodiment has a thin structure, the seat pan 15 has rigidity equivalent to that of the assumed seat pan 110 having a thick structure. Therefore, it can be seen that the seat pan 15 of this embodiment has the same rigidity as the conventional metal seat pan 100 having the same degree of rigidity as the assumed seat pan 110.

  As shown in FIGS. 4, 5, 7, and 11, in the seat pan 15 of the present embodiment, the mountain-shaped portion 24, the first intersecting rib 25, and the second intersecting rib 26 that constitute the seat surface portion 22. The thickness T0, T1, T2 (T1 = T2 = T3 = 0.7-1.0 mm) and the thickness T3 (T3 = 1.5-2.0 mm) of the orthogonal ribs 23 are assumed sheet pans. 110, the thickness N of the flat plate portion 111 and the rib portion 112 (N = 3.5 mm) is set to be approximately equal to the cross-sectional area along the x direction. It is configured to have a thin structure of 1/5 to 4/7 with respect to N. For this reason, the heat storage area 27 (cross-hatching area) when the seat pan 15 is molded is narrower than the heat storage area 113 (cross-hatching area) when the assumed seat pan 110 is molded.

  Further, the sheet surface portion 22 of the seat pan 15 is configured in a shape in which the first intersecting ribs 25 and the second intersecting ribs 26 intersect with a plurality of adjacent mountain-shaped portions 24 and are uneven in the vertical direction (z direction). Has been.

  As a result, the A portion of the seat pan 15 (the portion where the orthogonal rib 23 intersects the mountain-shaped portion 24 of the seat surface portion 22) and the B portion of the assumed seat pan 110 (the flat plate portion 111 and the rib portion 112 intersect). As shown in FIG. 8, the temperature change at the A portion is a curve Ca and the temperature change at the B portion is a curve Cb. From these curves Ca and Cb, the time until cooling to below the heat distortion temperature is that the A part is after the time Sa, the B part is after the time Sb (Sa <Sb), and the A part is B. It turns out that it cools more rapidly than a site | part. For this reason, at the time of molding, the sheet pan 15 can be taken out from the mold as a molded product by operating the protruding pin 28 earlier than the assumed sheet pan 110.

With the configuration as described above, the following effects (1) to (4) are achieved according to the present embodiment.
(1) As shown in FIGS. 2 to 4, since the seat pan 15 is made of a resin material, the weight of the seat pan 15 can be reduced. Furthermore, the base surface portion 22 of the seat pan 15 is configured by a plurality of first intersecting ribs 25 and second intersecting ribs 26 being arranged to intersect with a plurality of mountain-shaped portions 24 arranged concentrically adjacent to each other. The mountain-shaped portion 24 has strength against a load in the horizontal direction (x direction and y direction), and the first intersecting rib 25 and the second intersecting rib 26 are resistant to a load in the vertical direction (z direction). Has strength. For this reason, even if the base surface portion 22 has a thin-wall structure, the rigidity thereof, and thus the rigidity of the seat pan 15 can be ensured.

  (2) The seat pan 15 is provided with orthogonal ribs 23 that stand upright in the center position in the width direction (x direction) of the seat pan 15 in the base surface portion 22 and extend in the front-rear direction (y direction) of the seat pan 15. ing. For this reason, the strength of the seat pan 15 is increased by the orthogonal ribs 23 and the rigidity is secured against the twist M about the axis K in the front-rear direction (y direction) of the seat pan 15. As a result, the rigidity of the seat pan 15 can be further improved.

  (3) As shown in FIG. 7, the base surface portion 22 and the orthogonal ribs 23 of the seat pan 15 can be configured to have a thin-walled structure, so that heat accumulation (heat storage region 27) during molding of the seat pan 15 can be reduced. Further, the base surface portion 22 is configured by a plurality of first cross ribs 25 and a plurality of second cross ribs 26 intersecting with a plurality of mountain-shaped portions 24, and has a shape that is uneven in the vertical direction (z direction), and has a cooling area. It is expanding. As a result, the cooling performance of the base surface portion 22 and the orthogonal ribs 23 at the time of forming the seat pan 15 is excellent, the cooling time at the time of forming the seat pan 15 can be shortened, and the manufacturing cost of the seat pan 15 can be reduced.

  (4) Since the base surface portion 22 and the orthogonal ribs 23 of the seat pan 15 can be configured in a thin structure, heat accumulation (heat storage region 27) at the time of forming the seat pan 15 can be reduced, and the sheet surface portion 22 and the orthogonal ribs 23 are substantially omitted. It is configured to have a uniform thickness. As a result, the shrinkage difference between the base surface portion 22 and the orthogonal ribs 23 at the time of cooling the seat pan 15 is reduced, and the dimensional accuracy of the seat pan 15 can be improved.

  As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and is not intending limiting the range of invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. For example, in the present embodiment, the seat pan is described as being applied to the automobile seat pan 15, but may be applied to a seat used indoors or outdoors in a building.

DESCRIPTION OF SYMBOLS 10 Car seat 11 Seating part 14 Cushion material 15 Seat pan 16 Luggage storage room 21 Frame part 22 Base surface part 23 Orthogonal rib 24 Mountain-shaped part 25 1st cross rib 26 2nd cross rib

Claims (3)

A seat pan structure, which is disposed below the cushioning material in the seating portion of the seat and supports the load acting on the seating portion and is molded of a resin material,
The seat pan is integrally formed with a frame-shaped frame portion provided around and a base surface portion provided in a substantially planar shape inside the frame portion,
The base surface portion includes a plurality of chevron-shaped portions arranged concentrically adjacent to each other, and a plurality of first intersecting ribs and second intersecting ribs arranged to intersect these chevron-shaped portions. is composed Te,
A plurality of the first intersecting ribs extending radially from a central position of the concentric circle in a plan view of the base surface portion;
The second intersecting rib is bent in an L shape in a plan view of the base surface portion, the bent portion is positioned toward the center position of the concentric circle, and the bent portion intersects the first intersecting rib. A sheet pan structure formed by arranging a plurality at predetermined intervals . 2. The seat pan according to claim 1, wherein an orthogonal rib extending in the front-rear direction of the seat pan is provided upright on the base surface portion at a center position in the width direction of the seat pan in the base surface portion. Construction. The seat pan structure according to claim 1 or 2, wherein the seat pan is an automobile seat pan in which an article storage space is formed below the seat pan.

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