JP2010184085A - Seat pad for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat pad for a vehicle which has excellent softness on the front surface and an excellent support characteristic with respect to the horizontal deviation of an occupant, and is integrally manufactured by foam molding. <P>SOLUTION: Multiple round holes 8 are arranged in the upper surfaces of a thigh lower portion 2 and buttocks lower portion 3 in the seat pad 1 for a vehicle, and also multiple projecting lines 9 are arranged so as to partition the round holes 8. The projecting lines 9 are mutually connected and extended, so as to make hexagons when connecting the center lines CL. It is preferable that the height of each projection 9, i.e., the depth of each round hole 8 is 5-20 mm, especially, 10-15 mm, the inner diameter of the round hole 8 is 10-40 mm, especially, 15-30 mm, the smallest thickness of the projecting line 9 between the adjacent round holes 8 is 2-20 mm, especially, 4-10 mm, and the opening area of one round hole 8 is 100-900 mm<SP>2</SP>, especially, 400-700 mm<SP>2</SP>. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a vehicle seat pad, and more particularly, to a vehicle seat pad having a soft feeling on an occupant contact surface.

  Conventionally, a seat pad attached to a sheet of an automobile or the like is manufactured by injecting a urethane compound stock solution obtained by mixing a polyol component compound solution and an isocyanate component into a mold and foam-molding it.

  Of the vehicle seat pads, the lower thighs and lower buttocks where the occupant's buttocks and back directly hit the passenger's weight, and the material of this portion is closely related to the seating and riding comfort.

  Accordingly, various vehicle seat cushion pads have been proposed in which improvements are made such that the seating surface that has the greatest influence on the sitting comfort is a high-density part and other parts are low-density parts.

  For example, many vehicle seat pads in which a slab urethane foam is bonded to a pad body are used (see Patent Document 1). However, a cost is required for attaching the slab.

  A technique is also known in which a seat groove of a seat back pad is provided with a concave groove for increasing the stroke without changing the hardness of the urethane foam (see Patent Documents 2 and 3). However, in these techniques, since the concave groove is configured only by the wall portion that is orthogonal to the front-rear and left-right directions, a feeling of lateral deviation occurs during riding.

  Furthermore, a technique for improving the softness of the surface by providing slits having a depth of 5 mm vertically and horizontally at intervals of 50 mm is also known (see Patent Document 4). However, in this technology, a load element having a diameter of 50 mm is pressed against the pad surface and the hardness is measured to determine that the surface is soft. Therefore, when the butt or thigh of the occupant abuts, the above slit is soft. The soft feeling is not improved sufficiently.

Japanese Patent Laid-Open No. 9-271423 Japanese Utility Model Publication No. 6-015551 Special table 2008-537500 gazette JP-A-11-348629

  The present invention solves the above-mentioned conventional problems, and can produce a vehicle seat pad excellent in surface softness and good in suppressing the lateral displacement of the occupant while riding by foam molding integrally. The purpose is to do so.

  The vehicle seat pad according to claim 1 is a vehicle seat pad made of a resin foam molded body, and is provided with a plurality of recessed holes in at least a partial region of an occupant contact surface or a back surface opposite to the occupant contact surface. A plurality of ridges partitioning the holes are connected and extended so that the center lines of the ridges form a hexagon.

  According to a second aspect of the present invention, the vehicle seat pad according to the first aspect is characterized in that each concave hole is a round hole.

  A vehicle seat pad according to a third aspect is characterized in that, in the first aspect, each concave hole is a hexagonal hole.

  A vehicle seat pad according to a fourth aspect is characterized in that, in any one of the first to third aspects, at least one corner edge of a base end and a front end of each protrusion is rounded.

  In the vehicle seat pad of the present invention, a plurality of concave holes are provided in at least a partial region of the occupant contact surface or the back surface opposite to the occupant contact surface, and the plurality of convex strips partitioning the plurality of concave holes are provided, The center lines of the ridges are connected to each other so as to form a hexagon. By providing this ridge, the ridge will compress and deform when the occupant abuts against this occupant abutment surface, so the softness of the occupant abutment surface compared to when no dent is provided Will improve. When the ridge is compressed and deformed more than a predetermined amount, the repulsive force of the ridge increases and the occupant is firmly supported.

Moreover, in the vehicle seat pad of the present invention, not the independent protrusions but the ridges extending so that the center line forms a hexagon are provided, and the ridges extending so as to be connected to the hexagon have a honeycomb structure. Thus, the lateral movement of the occupant during boarding can be suppressed because the movement in the horizontal direction can be countered more strongly than in the case where the vehicle goes straight in the vertical and horizontal directions.
And the convex line extending in the hexagonal shape is a branching point and branches in three directions, which are fewer than the four directions in the case of orthogonally crossing vertically and horizontally, so that the raw material is easy to flow in the molding die, so that the moldability is good.

  Since each of the concave holes is a round hole, the branch portion of the ridge is thicker than in the case of a hexagonal hole, and the feeling of support for lateral displacement is improved.

  Further, since each of the concave holes is a hexagonal hole, the branch portion of the ridge is thinner than in the case of a round hole, and the soft feeling is improved.

  And by rounding at least one corner edge of the base end and tip end of each ridge, the stress concentration at those corner edges is relaxed, and the durability of the ridge is improved. The retention of air in the mold is prevented and the moldability in the mold is improved, and the biting of the ridges at the corner edges of the mold is mitigated, so that the mold can be removed from the mold. improves.

  The seat pad of the present invention may be a seat cushion pad or a seat back pad.

1 is a plan view of a vehicle seat cushion pad according to an embodiment of the present invention. It is an enlarged plan view of a seating surface. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which expands and shows one of the protrusions of FIG. It is a partial top view of the seat surface which shows the vehicle seat cushion pad which concerns on other one Embodiment of this invention which used the recessed hole and the protruding item | line as another shape. It is sectional drawing in the position similar to FIG. 3 of the vehicle seat cushion pad which concerns on other one Embodiment of this invention which provided the concave hole and the protruding item | line in the bottom face. It is a front view of the vehicle seat back pad which concerns on another one Embodiment of this invention which provided the recessed hole and the protruding item | line in the seat surface. It is the front view which provided the concave hole and the protruding item | line also in the side support part of the seat surface. It is a graph which shows the result of an Example and a comparative example. It is a graph which shows the result of an Example. It is a graph which shows the result of an Example. It is a graph which shows the result of an Example and a comparative example. It is a graph which shows the result of an Example and a comparative example.

  Embodiments of the present invention will be described below with reference to the drawings.

[Vehicle seat cushion pad with a recessed hole in the seat]
1 is a plan view of a vehicle seat cushion pad according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of a seating surface, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The vehicle seat cushion pad 1 is made of a polyurethane foam that is integrally foam-molded as a whole, and includes a thigh lower part 2, a bottom part 3, and a side support part 4.

  The seat surface, which is the passenger contact surface of the vehicle seat cushion pad 1, includes a front-rear direction hanging groove 5 and a lateral width direction hanging groove 6 for hanging a skin material (not shown). It is provided so as to exhibit a letter shape. A portion in front of the hanging groove 5 and between the left and right hanging grooves 6, 6 is the lower thigh 2. Further, the bottom part 3 is between the hanging grooves 6 and 6 behind the hanging groove 5.

  The upper surface of the lower thigh 2 of the vehicle seat cushion pad 1 is provided with a number of round holes 8 as concave holes and a number of ridges 9 for partitioning between the round holes 8. The ridges 9 are connected to each other so as to form a hexagon when connecting the center lines CL. The top surface of the ridges 9 is a continuous surface with the seating surface around the area where the round holes 8 and the ridges 9 are provided.

  In the example shown in FIG. 3, the ridge 9 has a square cross section perpendicular to the seating surface, and the ridge 9 has a uniform width t from the base end (lower end) to the tip end (upper end). As shown in FIG. 4, at least one corner edge of the proximal end and the distal end of the ridge 9 may be rounded with a radius R.

The height of the ridge 9, that is, the depth h of the round hole 8 is 2 to 40 mm, particularly 5 to 20 mm, especially 10 to 15 mm, and the inner diameter D of the round hole 8 is 10 to 40 mm, especially 15 to 30 mm. The thickness t of the smallest protrusion 9 is preferably 2 to 20 mm, particularly preferably 4 to 10 mm. The opening area of one round hole 8 is preferably 50 to 1000 mm ^2, particularly 100 to 900 mm ^2, particularly 400 to 700 mm ² . The radius R is preferably 2 to 5 mm.

  The total area of the top surfaces of the ridges 9 is preferably about 20 to 80%, particularly about 20 to 50%, particularly about 25 to 35% of the total area of the round holes 8 and the ridges 9.

This vehicle seat cushion pad 1 is a polyurethane foam having a density of 35 to 100 kg / m ^3, particularly 60 to 70 kg / m ³ , and a 25% ILD hardness of 15 to 45 kgf / 200 mmφ, particularly 15 to 35 kgf / 200 mmφ, It is integrally molded as a whole by using a mold for foam molding having convex portions and concave grooves having shapes corresponding to the round holes 8 and the convex strips 9 on the bottom surface.

  Here, as shown in FIG. 2, the ridges 9 extend in three directions, so that the urethane stock solution supplied to a part of the cavity bottom surface is provided on the mold cavity surface (bottom part). Since the flow of the urethane stock solution meanders by about 60 ° in the concave groove for forming the strip 9, the urethane stock solution easily flows between the convex strips and thus easily spreads to every corner of the cavity.

  Thereafter, a skin material (not shown) is applied to the polyurethane molded body, whereby a vehicle seat pad product is obtained.

  When seated on the seat surface of the vehicle seat cushion pad 1 configured as described above, only the ridges 9 are compressed and deformed when the lower body of the occupant comes into contact with the seat surface, and the occupant feels a soft feel. Thereafter, when the body sinks and the protruding ridges 9 are further compressed and deformed, the repulsive force of the protruding ridges 9 becomes strong, and the occupant's body is stabilized. In addition, if the ridges 9 extend in three directions, the anisotropy when seated is smaller than that in which the ridges extend in two directions.

  In this embodiment, the ridges 9 are connected in a hexagonal shape, have a honeycomb structure, and can counteract lateral movement more strongly than in a case where the ridges 9 are perpendicular to each other. Can do. And since the protruding item | line 9 extended in a hexagon branches in three directions fewer than the four directions at the time of a perpendicular and horizontal direction at a branch point, since a raw material flows easily in a shaping die as mentioned above, moldability is good. It is good.

  Moreover, since each recessed hole is the round hole 8, the branch part of the protruding item | line 9 becomes thicker than the case of the hexagonal hole 10 mentioned later, and the feeling of support with respect to a lateral shift improves.

  When the inner diameter D of the round hole 8, the height h and the width t of the ridge 9 are within the above ranges, the round hole 8 and the ridge 9 are not easily sensed by the human body when seated, and the tactile sensation is good. Further, since the ridge 9 has a uniform cross-sectional shape from the base end to the tip end, the gradient of the stress-strain curve at the time of compressive deformation becomes gentle, and the seating feeling is good.

  When at least one corner of the base end and the tip end of each ridge 9 is rounded, stress concentration at those corners is relaxed and durability of the ridge is improved, and air in the mold at these corners is also improved. The retention is prevented and the moldability in the mold is improved, and the biting of the ridges 9 at those corners to the mold is alleviated and the mold release from the mold is improved.

  In the above embodiment, the round hole 8 and the ridge 9 are provided in the thigh lower part 2, but it may be provided also in the bottom thigh 3, or may be provided only in either one of the thigh lower part 2 or the bottom thigh 3, Further, it may be provided also on the side support portion 4, in which case the inner diameter D of the round hole 8, the convexity between the lower thigh 2 and the lower buttocks 3 or between the lower thigh 2, the lower buttocks 3 and the side support portion 4. The height h and width t of the strip 9 may be varied. In particular, in the side support portion 4, the inner diameter D of the round hole 8 and the height h of the ridge 9 may be made smaller than other portions in order to enhance the hold feeling.

[Vehicle seat cushion pad with hexagonal recesses]
Another embodiment of the present invention in which the recessed holes are hexagonal holes will be described with reference to FIG.

  In the embodiment shown in FIG. 5, a large number of regular hexagonal hexagonal holes 10 are arranged, and a large number of protruding ridges 11 that partition between the hexagonal holes 10 are provided. When connected, they are connected to each other so as to form a hexagon.

  The thickness t of the ridge 11 is preferably 2 to 20 mm, particularly 4 to 10 mm, and the diagonal length L of the hexagonal hole 10 is preferably 10 to 40 mm, particularly 15 to 30 mm. The opening area of one hexagon hole 10, the height of the ridge 11 (depth of the hex hole 10), the preferred range of the area ratio of the top surface of the ridge 11, the preferred material of the vehicle seat pad, etc. It is the same as that of embodiment shown in FIGS.

  In FIG. 5, the hexagonal hole is a regular hexagon, but it may be a hexagon other than a regular hexagon. However, a hexagon whose opposite sides are parallel is preferable, and a regular hexagon is most preferable.

[Vehicle seat cushion pad with a recessed hole on the back]
FIG. 6 is a cross-sectional view of a vehicle seat cushion pad according to still another embodiment of the present invention in which concave holes and ridges are provided on the bottom surface at the same position as in FIG. 3.

  In the vehicle seat cushion pad according to the embodiment shown in FIG. 6, a plurality of rounds as concave holes are formed on at least a part of the back surface (the back surface opposite to the passenger contact surface) of the vehicle seat cushion pad. In addition to providing the holes 8, a number of ridges 9 are provided for partitioning the round holes 8, and the ridges 9 have a hexagonal shape when connected to the center line CL, as shown in FIG. 2. They are connected to each other and extend.

  When the occupant sits on or leans against the occupant contact surface of the vehicle seat cushion pad, the ridges 9 between the round holes 8 are compressed and deformed so that the pad moves backward so that the stroke feels. Is good. For example, by providing this round hole 8 on the lower back surface of the lower thigh 2, the stroke feeling of the lower thigh 2 is improved.

  In addition, the ridges 9 are connected in a hexagonal shape, have a honeycomb structure, and can more strongly resist lateral movement than when they run vertically and horizontally, so that it is possible to suppress the lateral displacement of the occupant while riding. And since the protruding item | line 9 extended in a hexagon branches in three directions fewer than the four directions at the time of a perpendicular and horizontal direction at a branch point, since a raw material flows easily in a shaping die as mentioned above, moldability is good. It is good.

  In addition, on the back surface of the vehicle seat cushion pad, hexagonal holes 10 and ridges 11 may be used instead of the round holes 8 and ridges 9.

[Vehicle seat back pad with a recessed hole in the seat]
In the present invention, a recessed hole may be provided in the seating surface or the back surface of the seat back pad. FIG. 7 is a front view of a seat back pad showing one embodiment thereof. In this embodiment, on both the left and right sides of the front surface of the seat back pad 40, there are provided skin suspending grooves 41, 41 extending in the vertical direction, and the skin suspending grooves 41, 41 are connected in the left-right direction. The existing skin hanging grooves 42 and 43 are provided.

  And on the seat back pad seating surface or the back surface of the upper back contact region 44 of the upper skin hanging groove 42, the above-mentioned round hole 8 and the convex strip 9, or the above-mentioned hexagonal hole as a large number of concave holes and convex strips. 10 and the ridges 11 are provided, so that the back contact region 44 has a high stroke feeling and can suppress a lateral shift of an occupant while riding. A concave hole may also be provided on the back surface of the intermediate region 45 below the back contact region 44. It is preferable that the lower lumbar abutment portion 46 is not provided with a concave hole to enhance lumbar support characteristics.

  The lower end edge of the region 44 and the skin hanging groove 42 substantially coincide with each other. The distance between the lower edge of the region 44 and the seating surface of the seat is preferably about 250 to 500 mm, particularly about 300 to 400 mm. The distance between the upper end edge of the region 44 and the upper end of the seat back pad 40 is preferably 100 mm or less, particularly about 20 to 50 mm.

[Vehicle seat back pad with recessed holes in side support]
FIG. 8 is a front view of a vehicle seat back pad according to still another embodiment of the present invention. The vehicle seat back pad 40 includes an upper portion 47 of a side support portion surrounded by a two-dot chain line, that is, a backrest. Also in the areas on both sides of the contact area 44, the above-described round holes 8 and ridges 9 or the above-described hexagonal holes 10 and ridges 11 are provided as a large number of concave holes and ridges, which is softened and being boarded. You may make it suppress lateral shift of the passenger | crew of.

  In this case, as in the case of the previous seat cushion pad, the inner diameter D of the round hole 8, the height h and the width t of the protrusion 9 are made different between the back contact region 44 and the upper portion 47 of the side support portion. May be. In particular, in the side support portion, the inner diameter D of the round hole 8 and the height h of the ridge 9 may be made smaller than other portions in order to enhance the hold feeling.

  Hereinafter, examples and comparative examples will be described. For convenience, Comparative Example 1 will be described first.

Comparative Example 1
A sheet pad made of polyurethane foam having a density of 64 kg / m ³ and a 25% hardness of 24 kgf / 200 mmφ was manufactured. This seat pad is not provided with round holes 8 or hexagonal holes 10. The load-stroke curve of the seating surface of this seat pad was determined. In this measurement, a loader having a diameter of 200 mm was used, and this loader was pressed against the seat surface at a speed of 0.8 mm / sec, and the reaction force was measured. The results are shown in FIG. Since no concave hole is provided, the volume ratio of the ridge is 100%. Here, the “volume ratio of the ridges” means the ratio of the volume of the ridges in the volume of the area where the ridges are provided (the area of the area × the height of the ridges).

Example 1
By providing a protrusion on the lower thigh molding surface (cavity surface) of the molding die of Comparative Example 1, the same urethane stock solution as in Comparative Example 1 was used, and the lower thigh shown in FIGS. 1 to 3 was softened. A seat pad was manufactured. The diameter of the round hole 8 was 12 mm, the depth was 5 mm, and the distance between the centers of the adjacent round holes 8 was 19 mm. The volume ratio of the ridges 9 is 70%. A loader was pressed against the lower thigh in the same manner as in Comparative Example 1 to obtain a load-stroke curve. The results are shown in FIG.

Example 2
In Example 1, the diameter of the round hole 8 was 19 mm, the depth was 5 mm, and the distance between the centers of adjacent round holes 8 was 26 mm. The volume ratio of the ridges 13 is 50%. Otherwise, the seat pad was manufactured in the same manner as in Example 1.

Example 3
In Example 1, the diameter of the round hole 8 was 24 mm, the depth was 5 mm, and the distance between the centers of the adjacent round holes 8 was 30 mm. The volume ratio of the ridges 13 is 40%. Otherwise, the seat pad was manufactured in the same manner as in Example 1.

Example 4
In Example 1, the diameter of the round hole 8 was 28 mm, the depth was 5 mm, and the distance between the centers of adjacent round holes 8 was 32 mm. The volume ratio of the ridges 13 is 25%. Otherwise, the seat pad was manufactured in the same manner as in Example 1.

  A loader was pressed against the lower right thigh of the seat pads of Examples 1 to 4 in the same manner as in Comparative Example 1 to obtain a load-stroke curve. The results are shown in FIG.

[Discussion]
As shown in FIG. 9, it was recognized that the lower right thigh of the seat pads of Examples 1 to 4 were superior in surface softness and body supportability as compared with Comparative Example 1. It was also recognized that the smaller the volume ratio of the ridges, the softer.

  In addition, about the lower thigh of each seat pad, the residual distortion after compressing 50% for 22 hours in a thermo-hygrostat of 50 ° C. and humidity 95% was measured, and the result is shown in FIG. The compression residual strain decreases as the volume ratio increases, and the volume ratio is preferably 40% to 70% in consideration of the soft feeling and the residual strain.

  Further, in Example 2, R = 3.5 mm R was applied to the corner edge on the base end side and the tip end side of the protrusion (the corner edge was rounded). As shown in FIG. A reduction from 19.8% to 18.8% was observed.

  Further, the lower thigh of each seat pad is subjected to vibration that repeatedly vibrates 500,000 times at a frequency of 4.6 Hz and an acceleration of 0.7 G by a 68 kgf hip-type loader in an environment of an air temperature of 30 ° C. and a relative humidity of 80%. When the durability test was performed, as shown in FIG. 12, the amount of depression of the lower thigh over time was almost the same in Comparative Example 1 and Example 2.

  Furthermore, the sheet of the embodiment shown in FIG. 5 having the hexagonal hole 10 of L = 20 mm, which is substantially the same as that of Example 2, and the height h of the ridge 11 is 10 mm in Example 5 with h = 10 mm in Example 2. Example 6 as a pad was added to obtain a load-stroke curve of the seating surface. In this measurement, a loader having a diameter of 200 mm was used, and this loader was pressed against the seat surface at a speed of 0.8 mm / sec, and the reaction force was measured. The results are shown in FIG.

[Discussion]
For example, as shown in part A surrounded by a broken line in the drawing for initial seating assuming that a thigh load of 10.5 kg is applied, compared to Comparative Example 1, Examples 2, 5, and 6 are more sensitive to the stroke feeling during initial seating. Can be issued.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Vehicle seat cushion pad 2 Thigh lower part 3 Bottom part 8 Round hole 9 Convex strip 10 Hexagonal hole 11 Convex strip 40 Vehicle seat back pad

Claims (4)

In a vehicle seat pad made of a resin foam molded body,
A plurality of concave holes are provided in at least a part of the occupant abutting surface or the back surface on the opposite side, and a plurality of ridges separating the plurality of concave holes are formed, and the center line of the ridges is a hexagon. A vehicle seat pad characterized by being connected and extended to form   2. The vehicle seat pad according to claim 1, wherein each concave hole is a round hole.   2. The vehicle seat pad according to claim 1, wherein each recessed hole is a hexagonal hole.   The vehicle seat pad according to any one of claims 1 to 3, wherein at least one corner edge of a base end and a tip end of each protrusion is rounded.

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