JP5796512B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat provided with a cushion pad that can be bent and deformed in the seating direction when a seated person is seated.

  In a vehicle seat used by a vehicle occupant, conventionally, a cushion pad made of urethane foam is used for a seat cushion as a seating portion (see Patent Document 1 below). In general, the cushion pad is set to have a thickness of a portion supporting the heel portion of about 100 mm so that functions such as cushioning related to sitting comfort can be sufficiently exhibited.

Japanese Patent Laid-Open No. 06-133834

  By the way, in a hybrid electric vehicle, a battery pack, which is one of the drive sources, may be mounted under the seat cushion. In this case, it is necessary to secure the space for the battery pack by shortening the height of the entire seat assembly, and the cushion pad that is a part thereof is also required to be thin. However, simply reducing the thickness of the portion that supports the buttocks from 100 mm to 50 mm simply deteriorates various functions required of the cushion pad, and sacrifices the sitting comfort of the seated person.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a cushion pad that is comfortable even if it is thin.

In order to solve the above problems, the vehicle seat according to the present invention takes the following means.
A vehicle seat according to a first aspect of the present invention is a vehicle seat provided with a cushion pad that can be bent and deformed in a seating direction by the seating of the seated person, and the cushion pad is a seated person's seat when seated. A soft foamed resin body part that forms the central part of the working area of the seating load that serves as a position to receive the sciatic tubercle, and an elasticity having a higher elastic modulus than the foamed resin body part of the central part at the opposite position across the central part A body part, and when the seating load is applied to the cushion pad, the elastic part at the opposite position follows a downward deformation of the foamed resin part, and an upper part serving as a seating surface of the elastic part is while deformation in a direction close to each other is configured to allow the foamed resin body parts cooperating modified as can exert a reaction force upward, the elastic body portion of the opposed position, as viewed in the vertical direction cookie Characterized in that the seating surface to become the upper surface of Yonpaddo provided over the entire height of the lower surface.
According to this configuration, the elastic body portion having a higher modulus of elasticity than the foamed resin body at the central portion is provided at an opposing position across the soft foamed resin body portion that receives the sciatic nodule portion of the seated person. For this reason, even if the cushion pad is thin, the seating load of the seated person can be firmly supported by the elastic body portion having a high elastic modulus, and a cushion pad with a low feeling of bottoming can be provided.

  According to the first aspect of the present invention, it is possible to provide a cushion pad that is comfortable even if it is thin.

It is a front view showing a vehicular seat concerning an embodiment. It is a top view which shows the cushion pad which concerns on 1st Embodiment. It is sectional drawing which cuts and shows a cushion pad by the III-III line | wire of FIG. It is a schematic sectional drawing which shows the effect | action in the step which has a seating load in a low load area. It is a schematic sectional drawing which shows the effect | action in the stage in which the seating load reached the high load region. It is a top view which shows the cushion pad which concerns on 2nd Embodiment. It is a top view which shows the cushion pad which concerns on 3rd Embodiment. It is sectional drawing which shows the cushion pad which concerns on 4th Embodiment. It is sectional drawing which shows the cushion pad which concerns on 5th Embodiment. It is sectional drawing which shows the cushion pad which concerns on 6th Embodiment. It is a schematic sectional drawing which shows the effect | action in the stage in which the seating load reached the high load area in the conventional cushion pad.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows a seat 10 installed in a vehicle and used by a passenger. The seat 10 includes a seat cushion 20 on which an occupant is seated, and a seat back 30 that serves as a backrest for the seated occupant (seater). The seat back 30 is connected to the rear portion of the seat cushion 20. The seat cushion 20 includes a frame (not shown) having a frame shape serving as a skeleton. The frame is provided with a metal cushion pan 50 (see FIG. 3) having a plate shape for supporting a seating load. On the cushion pan 50, a cushion pad 60 that forms an outer shape including a seating surface is provided. Around the cushion pad 60, a sheet-like skin material 40 that provides tactile sensation and design is covered.

  The cushion pad 60 is generally formed of a polyurethane foam that is a soft foamed resin. The cushion pad 60 has an appropriate cushioning property as the soft foamed resin body, and supports the seated person while bending under the load from the seated person. The polyurethane foam is a polyurethane resin foam which is a copolymer of a polyol and an isocyanate, and a catalyst, a foaming agent and a foam stabilizer are appropriately added to and mixed with the polyol and the isocyanate as a monomer and reacted by heating. To generate. Since the composition of the polyurethane foam generally used for the cushion pad of a vehicle seat is well known, detailed description is omitted here.

As shown in FIG. 2, the cushion pad 60 has two top grooves 62 extending in the front-rear direction of the seat as a boundary, and a top plate portion 62 positioned at an intermediate portion thereof, and side supports positioned on both left and right sides in the seat width direction. Divided into part 64.
The top plate portion 62 receives a seated person's buttocks on the upper surface, which is a seating surface, and supports a downward load (sitting load) due to the seating. In the present invention, the top plate portion 62 functions characteristically as described later. The top plate portion 62 has a width of about 300 mm to 400 mm in the sheet width direction and a height of about 50 mm.
On the other hand, the side support portions 64 positioned on the left and right sides of the top plate portion 62 are formed so as to bulge upward from the seating surface of the top plate portion 62 as shown in FIG. The load acting on the direction is supported, and the posture of the seated person is stably maintained.
The hanging groove 66 is a groove that is recessed downward from the seating surface as shown in FIG. A portion of the skin material located on the hanging groove 66 is held in a state of being drawn into the hanging groove 66 by a holding tool fixed in the hanging groove 66. Thus, the skin material 40 to which tension is applied is stretched in close contact with the top plate portion 62 and the surfaces of the side support portions.

  The seating load from the seated person's buttocks H acts on a partial region (load operation region) closer to the rear of the top plate 62 in a normal seating posture. In particular, the central portion 62A (see FIG. 2) occupying the central position of the load acting area is the main portion of the top plate portion 62, and protrudes to the lowest of the seated person's buttocks as shown in FIG. This includes a portion that receives the pair of left and right sciatic tubeross T (see FIGS. 4 and 5). Further, in order to avoid the portion that receives the sciatic nodule portion T, a portion (elastic body portion 62B) formed by an elastic body having a higher elastic modulus than the foamed resin occupying the central portion 62A at the peripheral position of the load acting area. Is provided. The “foamed resin body part” according to the present invention corresponds to the central part 62A of the load acting area, which is a part having a difference in elastic modulus from the elastic body part 62B, among other cushion pads.

The elastic body part 62B is disposed at both side positions facing each other across the central part 62A in plan view. In particular, the elastic body portion 62B in the present embodiment is formed in a C-shape (or a horseshoe shape) whose front is opened as shown in FIG. It is arrange | positioned in the position which mutually opposes on both sides.
Further, as shown in the cross-sectional view of FIG. 3, the elastic body portion 62B is provided over the entire height from the upper surface (sitting surface) to the lower surface of the cushion pad as viewed in the vertical direction.
Further, the inner wall (side facing the central part 62A) and the outer wall (side far from the central part 62A) and the outer wall (the side far from the central part 62A) of the elastic body part 62B forming an interface with other parts are set substantially vertically as shown in FIG. Yes. The thickness of the elastic body portion 62B from the inner wall to the outer wall is preferably set to 30 mm or more. Further, it is desirable that the interval between the inner walls of the portions of the elastic body portion 62B facing each other is set to 200 mm or more.

Next, the interaction between the seated person's buttocks, the central portion 62A, and the elastic body portion 62B during the seating load operation will be described. 4 and 5 are cross-sectional views showing the top plate portion 62 of the cushion pad 60 taken along the plane including the elastic body portions 62B located on opposite sides of the central portion 62A. FIG. 4 shows a stage where the seating load W is in the low load region and the amount of deflection is still small, and FIG. 5 shows that the seating load W reaches the high load region and time passes and the seating posture is fixed and the seating load W is substantially reduced. The stage which supports is shown.
When the seated person sits on the cushion pad, as shown in FIGS. 4 and 5, the seating load W acts on the top plate portion 62 of the cushion pad that receives the buttocks of the seated person, and the top plate portion 62. Bends downward and deforms. In the initial stage of the seating operation, as shown in FIG. 4, only the central portion 62A (foamed resin body portion) of the load acting area simply bends and deforms downward according to the outer shape of the buttocks including the sciatic nodule portion T. Therefore, in the initial stage, the sciatic nodule portion T can be softly received by the soft foamed resin body. The seating load W is supported by the upward reaction force F1 accompanying this deformation.
In the next stage of the seating operation, as shown in FIG. 5, the elastic body parts 62B located on opposite sides of the central part 62A are also bent and deformed downward. At this time, the upper portion of the elastic body portion 62B is not only bent and deformed downward, but also deformed so as to be drawn in directions close to each other following the downward deformation of the central portion 62A. That is, at least the upper part of the elastic body part 62B is configured to be able to deform in cooperation with the central part 62A. As means for configuring in this way, the elastic body portion 62B and the central portion 62A in the present embodiment are bonded to each other at the interface.

The conventional cushion pad shown in FIG. 11 does not have the elastic body portion 62B having a relatively high elastic modulus in the present invention. For this reason, the part outside the two-dot chain line in the figure corresponding to the elastic body part 62B can be more freely deformed, and simply bent upward by bending and deforming by an amount corresponding to the outer shape of the collar. The reaction force F was only generated. In general, the shape of the collar portion is not flat but is inclined upward as it goes in the peripheral direction. Therefore, the amount of bending of the peripheral portion is smaller than the amount of bending of the central portion 62A, and the thickness of the top plate portion 62 is reduced. Nevertheless, the contribution of the seating load W to the support was small.
However, the elastic part 62B provided in the present invention is set so that its elastic modulus is larger than that of the central part 62A. When the seating load W exceeds a certain level as shown in FIG. It can be demonstrated. Further, since the elastic body part 62B is less deformable than the central part 62A due to its high elastic modulus, not only the downward bending deformation but also a deformation behavior in which the whole is curved inward occurs. Therefore, as described above, the upper portions of the opposing elastic body portions 62B at the opposite side positions are deformed so as to be drawn in directions close to each other following the downward deformation of the central portion 62A. That is, as the central portion 62A sinks, the ratio of bearing the seating load W gradually shifts to the elastic portion 62B, and the support function of the elastic portion 62B is exhibited according to the amount of deformation of the central portion 62A.
The upper surface of the elastic body portion 62B is inclined due to the inclined shape of the outer shape of the buttock, and the reaction force against the seating load W acts obliquely inward and upward as shown in FIG. Therefore, in detail, the component force F2 vertically upward of this oblique force contributes to the support of the seating load W as a new force applied to the reaction force F1 vertically upward of the central portion 62A.

Next, the elastic body constituting the elastic body portion 62B will be described in detail.
The elastic body occupying the elastic body portion 62B in this embodiment is a composite in which the voids of the three-dimensional network structure 72 are filled with the foamed resin 70, as schematically shown in the partial enlarged view in FIG. It is configured as a structure. In other words, as well shown in the overall view of FIG. 3, the foamed resin body is present in a state where the three-dimensional network structure 72 is impregnated. Specifically, this three-dimensional network structure is a structure having a network structure that is three-dimensionally spread while forming a continuous void. This structure is a three-dimensional net-like elastic body 72 that exhibits elasticity with deformation of the net-like structure. Further, the foamed resin 70 is filled in the voids of the network structure of the three-dimensional network elastic body 72 as described above, so that the elasticity of the filled resin is added in addition to the elasticity of the network structure. The elastic modulus of the three-dimensional network structure 72 and the filled foamed resin 70 is such that the elastic modulus of the elastic body portion 62B thus increased is higher than the elastic modulus of the foamed resin occupying the central portion 62A as described above. Is set.
The elastic body having this composite structure can be manufactured by foaming a foamed resin material so as to penetrate into the voids of the three-dimensional network structure 72. In particular, the elastic body portion 62B of the cushion pad 60 of the present embodiment is formed by foaming while surrounding part made of foamed resin and foaming while part of the foamed resin raw material penetrates into the network structure. It is what is done. That is, if the usual foam molding is performed after the three-dimensional network structure 72 is installed and fixed at a target position in the mold for molding the cushion pad 60, the above-described elastic body is integrated with the surrounding foamed resin body. It can be molded. For this reason, it is desirable that the three-dimensional network structure 72 is difficult to change due to reaction heat generated when the foamed resin material is foamed. The elastic body part 62B and the central part 62A of the present embodiment are bonded to each other at the interface between them by being molded in this way.

As an example of the above-described three-dimensional net-like elastic body 72, a fiber structure made of a filament of thermoplastic resin can be used. Specifically, this fiber structure is a structure in which the filaments of the thermoplastic resin are intertwined in a three-dimensional disorder while forming many loops, and the contact portions of the filaments are bonded to each other by heat. . As the thermoplastic resin material, general materials such as polyester and polyether can be used. The filaments of the thermoplastic resin can be continuously formed by extrusion molding, and the cross-sectional size, shape, hollow and solid, etc. can be changed. Disordered loops formed by a large number of these filaments form an isotropic three-dimensional spring structure, and the multiple loops each bend and deform to exhibit the overall elasticity of the structure. The elastic modulus (hardness) can be adjusted by changing the apparent density of the three-dimensionally extending filaments in addition to changing the shape of the cross-section of the filaments.
As such a fiber structure, Breath Air (registered trademark) manufactured by Toyobo Co., Ltd. can be suitably used. This breath air has a small hysteresis loss and a high resilience. For this reason, the cushion pad 60 using this becomes a durable thing with little change with time by repeated compression.

The vehicle seat provided with the cushion pad 60 configured as described above has the following operational effects.
According to this configuration, the elastic body part 62B having a higher elastic modulus than the foamed resin body of the central part 62A is provided at both the left and right positions of the soft foamed resin body part (62A) that receives the sciatic nodule portion of the seated person's buttocks H. It has been. For this reason, even if the cushion pad is thin, the seating load of the seated person can be firmly supported by the elastic body part 62B having a high elastic modulus, and a cushion pad with a low feeling of bottoming can be provided.

(Other embodiments)
Next, another embodiment for carrying out the present invention will be described with reference to the drawings.
The second and third embodiments are embodiments in which the shape of the elastic body portion 62B in the top view is changed in the first embodiment. In the second embodiment shown in FIG. 6, the elastic body portions 62B are linearly arranged in the front-rear direction at the left and right side positions of the central portion 62A in a top view. In the third embodiment shown in FIG. 7, the elastic body portion 62B is arranged in a shape in which the middle portion is bent outward at the left and right side positions of the central portion 62A in a top view. In any of the embodiments, unlike the first embodiment, the elastic body portion 62B is not provided at the rear position of the load acting area. However, similarly to the first embodiment, the elastic body portions 62B are disposed at the left and right sides facing each other across the central portion 62A, and the same effects as those of the first embodiment are obtained. In addition to the first to third embodiments, the elastic body portions 62B can be disposed at both positions before and after facing each other across the load acting area. Further, as long as the elastic body portion 62B is disposed at the facing position, the top view shape does not need to be formed in a linear shape, and may be a short shape such as a cylindrical shape or a prism shape.
4th-6th embodiment is embodiment which changed the cross-sectional shape of the elastic-body part 62B in 1st Embodiment. In the fourth embodiment shown in FIG. 8, the inner wall of the elastic body portion 62B is inclined outward in the downward direction. In the fifth embodiment (reference example) shown in FIG. 9, the elastic body portion 62B is disposed only in the upper part of the cushion pad in the height direction. On the other hand, in the sixth embodiment (reference example) shown in FIG. 10, the elastic body portion 62B is disposed only in the lower portion in the height direction. Any of the embodiments has the same effect as the first embodiment.

In addition, the vehicle seat provided with the cushion pad according to the present invention is not limited to the first to sixth embodiments described above, and can be implemented in various other forms.
The elastic body constituting the elastic body portion 62B according to the above embodiment is the one in which the foamed resin 70 is filled in the voids of the network structure of the three-dimensional network elastic body 72, but as a whole than the central portion 62A. As long as the elastic modulus is high, for example, the foamed resin 70 may be filled in the gap of the coil spring. Further, it is not a complex structure, and it may be simply a solid such as rubber or polyurethane foam.
The elastic body portion 62B and the central portion 62A in the present embodiment are bonded to each other at the interface as means for configuring at least the upper portion of the elastic portion 62B to be able to deform in cooperation with the central portion 62A. Met. However, if the upper part of the elastic body part 62B can be cooperatively deformed following the central part 62A by the tension of the skin material 40, the mutual bonding is not necessarily required. Also, the adhesion between the two is integrally formed by foaming while part of the foamed resin material penetrates into the network structure at the same time as foam molding of the surrounding part made of foamed resin with the elastic body part 62B. It was made. However, regardless of this means, both may be simply bonded with an adhesive, bonded via another member, or appropriately bonded by chemical bonding.
Moreover, although the three-dimensional network structure 72 having voids is a fiber structure made of thermoplastic resin filaments, it may be a foamed resin body having open cells.

DESCRIPTION OF SYMBOLS 10 Seat 20 Seat cushion 30 Seat back 40 Skin material 50 Cushion pan 60 Cushion pad 62 Top plate part 62A Central part 62B Elastic body part 64 Side support part 70 Foamed resin 72 Three-dimensional network structure (three-dimensional network elastic body)
H buttocks T ischial tuberosity

Claims (1)

A vehicle seat provided with a cushion pad that can be bent and deformed in a seating direction by sitting of a seated person,
The cushion pad includes a soft foamed resin body part that forms a central part of a seating load acting region that is a position to receive a seated person's sciatic tuberosity at the time of sitting, and the central part at a position opposite to the central part. An elastic body part having a higher elastic modulus than the foamed resin body part ,
When the seating load is applied to the cushion pad, the elastic body portion at the opposite position follows the downward deformation of the foamed resin body portion so that the upper portion serving as the seating surface of the elastic body portion is close to each other. It is configured to be able to cooperatively deform with the foamed resin body part so as to exert an upward reaction force while deforming ,
The vehicular seat characterized in that the elastic body portion at the opposite position is provided over the entire height from the upper surface to the lower surface, which is the seating surface of the cushion pad as viewed in the vertical direction .

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