JP6102560B2 - Cushion body for vehicle seat - Google Patents

Description

  The present invention relates to a cushion body for a vehicle seat. In detail, it is related with the cushion body of the vehicle seat in which the several layer was formed.

Conventionally, it is widely known to use a cushion body for a vehicle seat. Further, it is known that a plurality of layers are formed for the cushion body (Patent Documents 1 and 2).
For example, Patent Document 1 describes a cushion body in which a relatively soft layer is provided above a support plate and a relatively hard layer is provided below the support plate.
Patent Document 2 describes a cushion body in which a cloth material is used as an intermediate layer, an upper layer thereof has low density and low hardness, and a lower layer thereof has high density and high hardness.

Japanese Patent Laid-Open No. 11-18886 JP 2010-142571 A

  As described in Patent Document 2, if a low-density layer is used, the weight can be reduced accordingly. However, the low-density layer has a tendency to remain in a strain and is easy to sag, so there is room for improvement in terms of durability.

  The present invention was devised in view of the above points, and the problem to be solved by the present invention is relatively durable even when a low-density layer is present in a cushion body of a vehicle seat. It is to improve.

In order to solve the above problems, the present invention takes the following means.
First, the first invention includes a first layer formed of a foamable resin and disposed on the seating surface side, a second layer formed of the foamable resin and disposed on the support member side, and a first layer And a third layer positioned between the second layer and the second layer in the thickness direction, wherein the second layer has a lower density and a higher density than the first layer. a hardness, the third layer, Ri higher hardness der than the first layer and the second layer, in the case where the third layer is formed by foaming a resin higher than the second layer It is characterized by density .

According to the first aspect of the present invention, the first layer formed of the foamable resin and disposed on the seating surface side, the second layer formed of the foamable resin and disposed on the support member side, A cushion for a vehicle seat comprising a layer and a third layer positioned in the thickness direction of the second layer, the second layer having a lower density and higher hardness than the first layer , and the third layer, Ri higher hardness der than the first layer and the second layer, in the case where the third layer is formed by foaming a resin density than the second layer because it is possible to reduce the weight of the cushion body. In addition, since the second layer has a low density, strain is likely to remain, but the third layer having a higher hardness than the first layer and the second layer is disposed on the seating slope side. Therefore, even when a local load is applied from the seated person, the second layer is locally disposed with respect to the second layer. That a heavy load is applied is suppressed. Therefore, the durability of the second layer can be increased.

  According to a second invention, in the first invention, the third layer is formed by solidifying the resin in a state where the resin enters the inside of the flexible planar member.

  According to the second aspect of the invention, the third layer is formed by solidifying the resin while entering the inside of the flexible planar member, and therefore has an appropriate rigidity. Is possible. In addition, the third layer can be formed relatively easily.

A third invention is the vehicle seat in which the vehicle seat cushion body is disposed in the first or second invention, the cushion body being a component of the seat cushion, and a seated person in the seat cushion. The first layer, the second layer, and the third layer are arranged under the seat bone of the seated person from the front side of the cushion body that is placed under the thigh near the knee of the seated person. Disposed on the rear side of the cushion body, and on the front side of the cushion body, the second layer is provided with a low density dominant region that is thicker than the first layer, and on the rear side of the cushion body, The first layer is characterized by having a thicker dominant region that is thicker than the second layer.

According to this third invention, the vehicle seat is provided with a vehicle seat cushion body, the cushion body is a constituent element of the seat cushion, and based on the state in which the seated person is seated on the seat cushion, The first layer, the second layer, and the third layer extend from the front side of the cushion body disposed below the thighs near the knee of the seated person to the rear side of the cushion body disposed under the seat bone of the seated person. Disposed on the front side of the cushion body is provided with a low-density dominant region in which the second layer is thicker than the first layer, and the rear side of the cushion body is the second layer more than the second layer. Since the layer 1 has a thick, high-density dominant region, it is possible to increase the thickness of the first layer under the sciatica of the seated person and to reduce the thickness under the thigh near the knee. It becomes possible to improve the seating feeling Get.
Moreover, 4th invention is a vehicle seat by which the cushion body of the vehicle seat in any one of 1st invention-3rd invention was arrange | positioned, Comprising: At least one part of the outer surface of a cushion body is provided. It is the structure covered with a seat cover, and the edge part of a seat cover is hung on the fixing tool with which the 2nd layer was equipped. According to 4th invention, the edge part of a seat cover can be stably hung on the fixing tool with which the relatively high hardness 2nd layer was equipped.

  ADVANTAGE OF THE INVENTION According to this invention, even if a low-density layer exists in the cushion body of a vehicle seat, it becomes possible to improve durability relatively.

It is a perspective view which shows the external shape of the vehicle seat to which this invention is applied. It is II-II sectional drawing of the vehicle seat described in FIG. It is the figure which showed the component of the seat cushion in the same cross section as FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings as appropriate.
Note that in the present specification, directions such as the front-rear direction, the up-down direction, and the left-right direction are defined as X in the front direction, Y in the left direction, and Z in the up direction. For example, normally, when the seated person P is seated, the field of view is the front, and the occipital side that does not enter the field of view is the rear.
The vehicle seat 1 of the present embodiment is a vehicle seat 1 used in a vehicle. Moreover, it is a rear seat disposed behind the driver seat or the passenger seat, and is a so-called bench seat. In addition, the vehicle seat 1 includes a headrest 4, a seat back 3 that serves as a backrest for the seated person P, and a seat cushion 2 that forms a seating surface that mainly supports the thigh region.
The seat cushion 2 and the seat back 3 are configured such that a cushion pan made of a metal plate serves as a support member 5 that supports the cushion body 6. Moreover, it is comprised so that the seated person P and the cushion body 6 may not contact | connect directly by setting it as the structure which covers at least one part of the outer surface of the cushion body 6 with the seat cover 8. FIG.

Next, the structure of the cushion body 6 in this Embodiment is demonstrated.
The cushion body 6 includes a first layer 61 formed at a density of about 0.045 ± 0.005 g / cm ^3, which is a density used in a normal cushion body 6, and a lower density than the first layer 61. The formed second layer 62, and the first layer 61 and the third layer 63, which is a harder portion than the second layer 62, are provided. The first layer 61 formed with a normal density is disposed on the side of the seating surface that comes into contact with the seated person P, and the second layer 62 formed with a lower density is a cushion body. 6 is disposed on the side of the support surface where the support member 5 that supports 6 is present. In addition, a third layer 63 is provided between the first layer 61 and the second layer 62.
By adopting this configuration, even when a load is locally applied to the first layer 61 from the seated person P, the load is dispersed due to the presence of the third layer 63, which is a portion of high hardness. Is done. Therefore, it is possible to suppress a local load from being applied to the low density second layer 62. For this reason, local deformation of the low-density second layer 62 is suppressed, and the durability of the cushion body 6 can be improved.

Of the cushion body 6 in the present embodiment, the first layer 61 disposed on the seating surface side and the second layer 62 disposed on the support surface side heat the urethane stock solution that is the foaming stock solution. It is formed by foaming by chemical reaction. Further, the third layer 63 is formed by integrating a nonwoven fabric that is a flexible planar member and urethane when the first layer 61 is foam-molded. The nonwoven fabric has a thickness of about 1 to 10 mm and can be impregnated with a urethane stock solution.
In the present embodiment, members to be the first layer 61 and the third layer 63 are formed at a time. Therefore, a non-woven fabric that can be impregnated with a urethane stock solution is set in a mold for foam molding, and a urethane stock solution for forming the first layer 61 is injected into the die. When the urethane stock solution is heated and subjected to foam molding, the urethane stock solution swells and solidifies while containing air bubbles to form the first layer 61, and the nonwoven fabric impregnates the urethane stock solution and solidifies. A third layer 63 having a hardness higher than that of the layer 61 is formed. That is, the first layer 61 and the third layer 63 are formed in an integrated state. Note that the urethane stock solution impregnated in the nonwoven fabric solidifies, so that the hardness of the third layer 63 is higher than that of the first layer 61 in which the nonwoven fabric is not present, as compared with the nonwoven fabric alone. In the present specification, a structure in which the first layer 61 and the third layer 63 are integrated may be referred to as a seated person side structure 71.

On the other hand, the member to be the second layer 62 in the present embodiment is formed separately from the members to be the first layer 61 and the third layer 63. Similar to the first layer 61, the second layer 62 is urethane foam. However, the density of the urethane foam that forms the second layer 62 is lower than the density of the urethane foam that forms the first layer 61. In the present specification, the urethane foam forming the second layer 62 may be referred to as a support surface side structure 72.
Further, the urethane foam forming the second layer 62 is formed to be harder than the urethane foam of the first layer 61.

As shown in FIGS. 2 and 3, the cushion body 6 is formed by overlapping the support surface side structure 72 and the seat occupant side structure 71. The cushion body is fixed so that the support surface side structure 72 and the seat occupant side structure 71 are not displaced by being wrapped around the seat cover 8. That is, the cushion body 6 in the present embodiment is not such that the support surface side structure 72 and the seated person side structure 71 are bonded and integrated. When the seat cover 8 is removed, the support surface side structure 72 and the seated person side structure 71 can be easily separated.
The seat cover 8 is fixed so as to be hung on a fixture 91 provided on the support surface side structure 72. Specifically, the fixture 91 is a wire that is insert-molded in the support surface side structure 72, and an engagement member 93 provided at an end of the seat cover 8 is hung on the wire. The seat cover 8 is fixed to the cushion body 6 so as to be in close contact with the fixing member 91 by engaging the engaging member 93. Further, the cushion body 6 covered with the seat cover 8 is locked to the cushion pan as the support member 5 using a locking member (not shown).

As shown in FIG. 2, at least a part of the first layer 61 is configured such that the front side of the seat cushion 2, that is, the rear side is thicker than the front side of the cushion body 6. Specifically, in the first layer 61, a portion H1 that is below the sciatic bone of the seated person P is configured to be thick, and a portion T1 that is below the thigh near the knee is configured to be thinner. In particular, it is desirable that the thickness ratio of the portion T1 below the thigh near the knee of the seated person P and the portion H1 below the sciatica is about 1: 1.25 to 2.
As shown in FIG. 2, at least a part of the second layer 62 is configured so that the front side of the seat cushion 2, that is, the rear side is thinner than the front side of the cushion body 6. Specifically, in the second layer 62, a portion H2 below the sciatic bone of the seated person P is configured to be thin, and a portion T2 below the thigh near the knee is configured to be thicker.
And the cushion body 6 which is a component of the seat cushion 2 is provided with a low-density dominant region where the second layer 62 is thicker than the first layer 61 on the front side, and on the rear side, The first layer 61 is provided with a high-density dominant region that is thicker than the second layer 62.
This is based on the idea that the first layer 61 having a high cushioning property is thickened under the sciatica, which is the portion to which the load is most applied when seated, and the lower part of the thigh near the knee which is not so much as a load is thinned. By setting it as the said structure, it becomes possible to receive a thigh firmly and it becomes possible to improve a seating feeling. In addition, regarding the lower ribs, it is possible to ensure sufficient cushioning properties by increasing the thickness of the first layer 61 having high cushioning properties.

  In the cushion body 6 of the seat cushion 2, a so-called top plate side 15 located on both outer sides of a portion located directly below the so-called top plate main 13, which is a surface in contact with the seat bone or thigh of the seated person P. The first layer 61 is formed thinner in the portion located directly below the first layer 61. This is because this part is a part located obliquely below the seated person P, and therefore is a part where the load applied from the seated person P is relatively small. Further, the portion located directly below the top plate side 15 is formed with a slight thickness so as to support the occupant P from the lateral direction, but in this portion, the first density lower than that of the first layer 61 is formed. By increasing the thickness of the second layer, the effect of reducing the weight is achieved.

When the cushion body 6 or the vehicle seat 1 according to the present embodiment is used, the second layer 62 having a low density can be used as a part of the cushion body 6, so that the overall weight can be reduced. . Further, since the third layer 63 having higher hardness is provided on the seated person P side than the second layer 62 having low density, the second layer 62 having low density is prevented from being locally distorted. This makes it possible to increase the durability of the cushion body 6 and further the vehicle seat 1.
Moreover, since the part by the side of the seating person P of the cushion body 6 is comprised by normal density, it becomes possible to ensure riding comfort.
Further, the first layer 61 is made of a urethane foam that can be bent, and the second layer 62 is made of a urethane foam that is hard but can be bent. The comfort can be improved.
In addition, since the third layer 63 having high hardness exists under the first layer 61, the first layer 61 can be formed into a shape having a good pressure distribution.
Moreover, since a layer with high hardness is formed by impregnating a 1 to 10 mm flexible non-woven fabric with a resin and solidifying it, it is difficult to feel a foreign object feeling. In addition, the first layer 61 can be made thinner because it is difficult to feel a foreign object. Therefore, it is possible to further reduce the weight.
In addition, since the hard third layer 63 is provided in all regions between the first layer 61 and the second layer 62, it is possible to obtain a gentle pressure distribution.
Further, the cushion body 6 has a structure in which the thickness of the portion H1 under the ribs of the first layer 61 is increased and the thickness of the portion T1 under the thigh near the knee is made thinner than that. It may be possible to improve the seating feeling of the seated person P despite being supported by.
Further, in the first layer 61 located on the seat occupant P side with respect to the third layer 63, a thick region is formed on the rear side, and a thin region is formed on the front side. It may be possible to bring a feeling of being supported. Furthermore, since the region of the second layer 62 having a low density can be increased, the effect of reducing the weight can be obtained.
Further, by forming the second layer 62, the shape of the entire cushion body 6 can be changed to a desired shape. In particular, the vehicle seat 1 capable of appropriately supporting the seated person P can be obtained without changing the shape of the support member 5 to a special shape.

As a modification, an embodiment in which a non-woven fabric is not used to provide the third layer 63 will be described below.
First, as a first step, a urethane stock solution is foam-molded to form a molded body. As a second step, a urethane stock solution is applied to one side of the foamed molded article. Thereby, the urethane stock solution is impregnated into the surface layer of the foam-molded molded body. As a third step, the foamed molded product applied with the urethane stock solution is heated to foam-mold the urethane stock solution applied to the foamed molded product. Then, a foam is formed so as to be integrated on the molded body formed in the first stage. In this state, since the urethane stock solution infiltrated into the surface layer of the molded body formed in the first stage is solidified, the surface layer portion becomes harder than other portions. This part becomes the third layer 63 in the modification.
In the modified example, since there is no need to provide a non-woven fabric, the number of parts can be reduced. Moreover, since the process which sets a nonwoven fabric can be skipped, workability | operativity improves. Note that the molded body formed in the first stage may correspond to the first layer 61 or the second layer 62.

Although one embodiment and one modification have been described above, the present invention can be implemented in various other forms besides the above-described form.
For example, the third layer does not have to be formed by impregnating a planar fibrous body such as a nonwoven fabric with a resin and solidifying, for example, by impregnating a porous polymer material such as slab urethane with a resin. A solidified form is also possible.
In addition, the second layer and the third layer are integrated, and the first layer can be provided as a separate body, and the third layer can be used as the first layer as well as the second layer. Also, it is possible that they are not integrated. For example, a felt provided separately from the first layer or the second layer can be used for the third layer.
The first layer, the second layer, and the third layer may be all integrated. In this case, the first layer and the third layer can be integrated, and then the second layer can be joined and integrated.
The foamable resin does not need to use urethane, and other known foamable resins can be used.
Further, the present invention is not limited to use in a seat cushion, and can be used in a seat back or the like. At this time, the cushion body of the present invention may be employed for both the seat cushion and the seat back, or may be employed for only one of them.
The cushion body is not limited to the one used for the rear seat, but can be used for a front seat such as a driver's seat.
The density of each layer in the cushion body is not limited to that described in the present embodiment, and can be determined as appropriate.
Moreover, it is not restricted to the structure which covers a separate seat cover with respect to the formed cushion body, but it is also possible that the seat cover and the cushion body are integrated.
Moreover, it is not restricted to the structure which supports a cushion body with a plate-shaped cushion pan, It is also possible to set it as the structure which supports a cushion body with a planar spring. However, it is easier to enjoy the benefits of applying the present invention when the cushion body of the present invention is supported by a cushion pan that does not have an elastic structure.
Further, the support surface side structure and the seat occupant side structure are not limited to be integrated, and the support surface side structure and the seat occupant side structure may be integrated with an adhesive or the like. Is possible.
The vehicle is not limited to a vehicle, and may be a vehicle that flies in the air such as an airplane or a helicopter, or a vehicle that moves on the sea surface or in the sea such as a ship or a submersible.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 3 Seat back 5 Support member 6 Cushion body 8 Seat cover 61 1st layer 62 2nd layer 63 3rd layer P Seated person

Claims (4)

A first layer formed of a foamable resin and disposed on the seating surface side, a second layer formed of the foamable resin and disposed on the support member side, and a thickness direction of the first layer and the second layer A vehicle seat cushion body comprising: a third layer located between:
Than the first layer is, high hardness should have a low density of the second layer, the third layer than the first layer and the second layer Ri high hardness der, third layer foam A cushion for a vehicle seat characterized by having a higher density than that of the second layer when formed of a conductive resin . The vehicle seat cushion body according to claim 1,
The third layer is formed by solidifying the resin in a state where the resin enters the inside of the flexible planar member. A vehicle seat provided with the vehicle seat cushion according to claim 1 or 2,
The cushion body is a component of the seat cushion, and the first layer, the second layer, and the third layer are the thighs close to the knee of the seated person on the basis of the state where the seated person is seated on the seat cushion. It is arranged from the front side of the cushion body arranged below to the rear side of the cushion body arranged under the seat bone of the seated person,
On the front side of the cushion body, there is a low density dominant region where the second layer is thicker than the first layer, and on the rear side of the cushion body, the first layer is thicker than the second layer. A vehicle seat characterized by having a high-density dominant region. A vehicle seat provided with the vehicle seat cushion according to any one of claims 1 to 3,
A vehicle seat characterized in that at least a part of the outer surface of the cushion body is covered with a seat cover, and an end portion of the seat cover is hung on a fixture provided in the second layer .

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