JP2016175527A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which is guaranteed to be rigid while also being lightweight.SOLUTION: The present invention relates to a vehicle seat S comprising, as a skeleton, a seat back frame F1 being a substantially rectangular framework configured to have at least a lower member frame 50 as a bridge in the vehicle width direction between the lower ends of two side frames 10, 10. A waist support member 70 formed of a resin is arranged on the lower member frame 50. The waist support member 70 is a rectangular member extending along the vehicle width direction and is configured such that the length thereof in the vehicle width direction is less than the length of the lower member frame 50 in the vehicle width direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat provided with a seat frame that is lighter than a conventional product as a skeleton.

In the case of reducing the weight of a vehicle seat, it is generally considered that each part of the seat frame is thinned and the occupancy of each part is reduced (e.g., shortening the long member, forming a hole). However, as the thickness of each part of the seat frame is reduced, the rigidity of the part decreases.
For this reason, while realizing weight reduction, the device for reinforcing the said weight reduction part was made | formed (for example, refer patent document 1).

In the technique described in Patent Document 1, two side frames that define both sides, an upper frame that bridges the upper ends of these side frames to define the upper side, and a lower end of these side frames that bridges define the lower side. A back frame formed in a rectangular frame state by a lower frame is disclosed.
The lower frame is formed with a flange portion extending forward from the lower end side, and a resin bracket having a dimension extending over the entire width of the flange portion (length in the sheet width direction) is attached to the flange portion. It has been.
And with such a structure, the flange part extended ahead from the lower frame lower end side is reinforced from the inner side.

Japanese Patent Laying-Open No. 2015-003598

In the seat back frame, particularly with respect to the lower frame, the seat back frame has a role to support the waist of the seat occupant, so that sufficient rigidity is required to receive a load received from the seat occupant. On the other hand, as described above, there is a demand for reducing the weight of the seat frame itself including the seat back frame.
In order to satisfy these conflicting requirements, the technique according to Patent Document 1 uses a bracket for reinforcement.
However, since the bracket is disposed over the entire length of the lower frame, further weight reduction is desired. Moreover, in the technique of patent document 1, since the bracket of a complicated shape is used, the technique with good workability | operativity with a simpler structure was desired.
Further, the vehicle seat according to Patent Document 1 is manufactured by increasing the step of incorporating the bracket itself into the assembled seat back frame and assembling the pad material thereto. Therefore, there is a problem that an assembling step increases in the assembling work, and workability is not good.
Further, since the metal lower frame (flange portion) and the resin bracket are in contact with each other, there is a problem that noise occurs at the contact portion during use.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat in which weight reduction is realized while securing rigidity.
Another object of the present invention is to provide a vehicle seat having good assembly workability when reinforcing a seat back frame.
Further, another object of the present invention is to effectively suppress the generation of noise in the combination portion of the arrangement side (the seat back frame side) and the reinforcement member when arranging the member for reinforcing the seat back frame. It is in providing the vehicle seat which can do.

  According to the vehicle seat of the present invention, the subject is a side frame provided at both ends of the vehicle seat in the width direction, and a lower member frame that bridges the lower ends of both side frames in the vehicle width direction , A vehicle seat provided with a substantially rectangular frame seatback frame configured as a skeleton, wherein a waist support member made of resin is disposed on the lower member frame, The waist support member is a long member extending along the vehicle width direction in which the lower member frame extends, and the vehicle width direction length of the waist support member is shorter than the vehicle width direction length of the lower member frame. It is solved by being constituted.

In the vehicle seat of the present invention configured as described above, the waist support member extending along the width direction is disposed on the lower member frame.
And this waist | hip | lumbar part support member was comprised with resin.
Thereby, since it becomes possible to reinforce a lower member frame using a lightweight resin material, a lower member frame can be thinned.
And since the length of the width direction of this waist | hip | lumbar part support member was formed shorter than the length of the width direction of a lower member frame, weight reduction can be implement | achieved more.
Moreover, since this waist | hip | lumbar part support member is a structure directly attached to a lower member frame, attachment workability | operativity improves and a complicated arrangement | positioning structure is also unnecessary.

At this time, as described in claim 2, the waist support member is preferably a foamed resin material.
In this way, when the waist support member is made of a foamed resin material, the waist support member can be reduced in weight, and the formability is good, so the degree of freedom in shape can be increased.

At this time, as described in claim 3, the waist support member may be attached to the surface of the lower member frame facing the front of the vehicle.
In the above configuration, the waist support member can function as a reinforcing member by being attached to the front surface of the lower member frame, and can also function as a member for supporting the seated person's waist.

Further, at this time, as described in claim 4, the shape of the surface of the waist supporting member facing the vehicle rear side is formed to match the shape of the surface of the lower member frame facing the vehicle front. It is preferable that
In this way, the waist support member is positioned with respect to the lower member frame by providing a shape capable of establishing an alignment relationship between the lower member frame side surface of the waist support member and the vehicle front side surface of the lower member frame. Work efficiency can be improved.

Further, at this time, as described in claim 5, in the lower member frame, a surface facing the front of the vehicle is formed with a matching portion formed in a hole, a concave shape, or a convex shape. In the waist support member, a surface facing the rear of the vehicle is provided with a convex portion that penetrates the hole, or a convex or concave shape that matches the concave or convex shape, as a matched portion that matches the matching portion. It is good to have.
In the above configuration, the waist support member can be positioned with respect to the lower member frame due to the alignment relationship between the alignment portion and the alignment target portion, and workability is improved.
That is, as a specific example of the matching relationship of claim 4, workability is improved by forming a convex portion that penetrates the hole, a concave portion that matches the convex portion, and a convex portion that matches the concave portion.

Further, at this time, as a more specific configuration, as described in claim 6, the alignment portion formed on the lower member frame facing the waist support member extends in the vehicle width direction. It is preferable that
According to a seventh aspect of the present invention, the alignment portion formed on the lower member frame facing the waist support member extends in the vehicle width direction, and the alignment portion extends in the vehicle width direction. It is preferable that the length is configured to be larger than the length of the waist support member in the vehicle width direction.
With this configuration, it is possible to more efficiently establish the matching relationship between the matching portion and the matched portion, and the matching portion is longer in the vehicle width direction and longer than the waist support member. Therefore, the rigidity of the lower member frame becomes higher.

At this time, as described in claim 8, in the lower member frame, at least one of the vehicle upper edge and the vehicle lower edge is bent so as to extend toward the front of the vehicle. It is preferable that at least one of the waist support members is regulated in the vehicle vertical direction by the flange.
In the above configuration, the upward movement of the waist support member can be restricted by the flange above the vehicle, and the downward movement of the waist support member can be restricted by the flange below the vehicle.
When flanges are formed in both the vehicle vertical direction, the waist support member can be gripped in the vertical direction by both the flanges.
Therefore, the waist support member can be positioned with respect to the lower member frame, and a temporary stop function can also be achieved, thereby improving workability.

In addition, as described in claim 9, a pad material made of resin is disposed on the seat back frame, and the hardness of the waist support member is higher than the hardness of the pad material. It is good to be formed.
With the above configuration, it is possible to achieve both weight reduction and rigidity retention.

According to a tenth aspect of the present invention, a pad material formed of resin is disposed on the seat back frame, and the waist support member is sandwiched between the lower member frame and the pad material. It is good to be attached in the state.
At this time, as a specific configuration, as described in claim 11, the pre-formed waist support member is inserted when the pad material is formed, and is integrally formed with the pad material. Good.
According to said structure, in the process of arrange | positioning pad material to a seat back frame, since a waist | hip | lumbar part support member can be attached to a lower member frame simultaneously, workability | operativity improves.
Further, since the pad material and the lower member frame are sandwiched, the mounting rigidity is increased.
Further, since the insert molding can be performed integrally, the molding efficiency is increased.

In addition, as described in claim 12, at least one rough surface forming shape selected from a concave shape, a hole shape, and a slit shape is formed on a contact surface between the waist support member and the pad material. Good.
In the above configuration, the contact area between the pad material and the waist support member is increased, and the degree of adhesion in integral molding can be increased.

The waist support member may be attached to the lower member frame with a non-woven fabric interposed between the waist support member and the lower member frame. .
With the above configuration, it is possible to effectively prevent noise from being generated during use between the lower member frame and the waist support member.

According to the vehicle seat of claim 1, a resin waist support member extending in the width direction is disposed on the lower member frame, and the length of the waist support member in the width direction is set to the lower member frame. It was formed shorter than the length in the width direction.
Therefore, in addition to making it possible to reinforce the lower member frame using a lightweight resin material, the width in the width direction has been shortened, so the lower member frame is thin while achieving higher weight reduction. Can be realized.
Moreover, since this waist | hip | lumbar part support member is a structure directly attached to a lower member frame, attachment workability | operativity improves and a complicated arrangement | positioning structure is also unnecessary.
According to the vehicle seat of the second aspect, the weight can be reduced and the degree of freedom in forming the waist supporting member is also improved.
According to the vehicle seat of the third aspect, it is possible to have a function as a reinforcing member and a waist support function of the seated person.
According to the vehicle seat of the fourth aspect, the waist support member can be positioned with respect to the lower member frame, and the working efficiency is improved.
According to the vehicle seat of the fifth aspect, a positioning function can be given (which is a specific example of the alignment relationship), and workability is improved.
According to the vehicle seat of claim 6 and claim 7, it is possible to construct the matching relationship more efficiently, and the rigidity of the lower member frame is also increased. In addition, it is possible to provide positioning and temporary stop functions in the vertical direction of the vehicle, improving workability.
According to the vehicle seat of the ninth aspect, both weight reduction and rigidity retention can be realized.
According to the vehicle seat of the tenth and eleventh aspects, since the attachment of the waist support member to the lower member frame is completed simultaneously with the step of arranging the pad material on the seat back frame, workability is improved. Since it is in a state of being sandwiched between the pad material and the lower member frame, the mounting rigidity is increased, and the insert molding can be integrally performed, so that the molding efficiency is also increased.
According to the vehicle seat of the twelfth aspect, the degree of adhesion in the integral molding can be increased.
According to the vehicle seat of the thirteenth aspect, it is possible to effectively prevent noise from occurring during use.

1 is an overall view of a vehicle seat according to an embodiment of the present invention. It is a front perspective view of the seat frame concerning one embodiment of the present invention. It is a back perspective view of a seat back frame concerning one embodiment of the present invention. It is an enlarged view of the arrangement | positioning position part of the arrangement | positioning member for the lower member-frame which concerns on one Embodiment of this invention. FIG. 4 is an explanatory diagram of one end of a lower member-frame arrangement member according to an embodiment of the present invention. It is the other end part side explanatory view of the arrangement member for lower member frames concerning one embodiment of the present invention. It is explanatory drawing which shows the attachment state to the lower member of the arrangement member for the lower member frame which concerns on one Embodiment of this invention. It is a cross-sectional equivalent view which shows after arrangement | positioning of the arrangement | positioning member for lower member frames which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described. The embodiment described below is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Furthermore, in the following description, the contents regarding the material, shape, and size of each device and its component parts are merely one specific example, and do not limit the present invention. That is, the material, shape, and size of each device and its component parts can be freely designed as long as they satisfy the specific matters of the present invention.

  Further, in the following description, the “front-rear direction” means the front-rear direction of the vehicle seat, and specifically, a direction that coincides with the traveling direction of the vehicle. The “width direction” means the width direction of the vehicle seat, and specifically, is a direction that coincides with the vehicle width direction (left-right direction).

  Further, the following description assumes that the vehicle seat is in a use state (a state in which a seated person can be seated), unless otherwise specified. That is, in the following description, the posture and position of each part of the vehicle seat and the positional relationship with other members are the contents when the vehicle seat is in use.

<< Basic configuration of vehicle seat and seat frame >>
First, a basic configuration of a vehicle seat (hereinafter, this seat S) according to the present embodiment and a basic configuration of a seat frame F constituting the skeleton thereof will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the seat S includes a seat back S1, a seat cushion S2, and a headrest S3. The seat back S1 and the seat cushion S2 are configured by placing the pad material P on the seat frame illustrated in FIGS. 2 and 3 and covering the surface of the pad material P with the skin material W. The headrest S3 is configured by arranging a pad material P on a core material (not shown) and covering the surface of the pad material P with a skin material W. A pair of headrest pillars (not shown) extending downward are provided below the headrest S3. The headrest S3 is supported by the upper end of the seat back S1 (strictly speaking, the seat back frame F1) via the pair of headrest pillars.

  2 and 3, the seat S includes a seat back frame F1 included in the seat back S1 and a seat cushion frame F2 included in the seat cushion S2. The seat cushion frame F2 is connected to the upper rail RU of the slide rail device R disposed below the seat cushion frame F2. With this configuration, when the upper rail RU moves along the lower rail RL fixed to the vehicle body floor, the entire seat S including the seat cushion frame F2 slides.

  In the present embodiment, the seat cushion frame F2 is connected to the upper rail RU via the rotation link XL as shown in FIG. The rotation link XL is a link member disposed on both sides of the seat cushion S2 in the width direction, and rotates about a rotation axis along the width direction. And the position of seat cushion S2 in the up-and-down direction comes to be adjusted because rotation link XL rotates while rotating with seat cushion S2.

  Further, the lower end portion of the seat back frame F1 is connected to the rear end portion of the seat cushion frame F2 via the reclining device 80. By this reclining device 80, the seat back S1 including the seat back frame F1 is coupled to the seat cushion S2 in a state in which an inclination angle with respect to the seat cushion S2 can be adjusted. That is, the seat back S1 can rotate relative to the seat cushion S2 about the reclining shaft 81 along the width direction.

  And this seat S differs from the conventional general vehicle seat in the structure of a seat frame. Hereinafter, the configuration of the seat back frame F1 as the seat frame included in the seat S will be described in detail.

<< Detailed configuration of seat back frame >>
The configuration of the seat back frame F1 included in the seat S will be described with reference to FIGS. As shown in FIG. 2, the seat back frame F1 forms a square frame when the seat frame F is viewed from the front. Further, the seat back frame F1 is lighter than a seat back frame included in a conventional general vehicle seat. More specifically, a material that is lighter than a material used for a conventional seat back frame is used as a material that constitutes the seat back frame F1 (for example, a steel plate that constitutes a side frame 10 described later). . Further, when the parts constituting the seat back frame F1 are fastened and connected, the parts are fastened and connected by laser welding without using fasteners such as bolts, nuts and screws. By adopting such a configuration, the seat back frame F1 according to the present embodiment is lighter.

The structure of the seat back frame F1 will be described. As shown in FIGS. 2 and 3, the seat back frame F1 has a pair of side frames 10 provided at both ends in the width direction. Further, as shown in the figure, the seat back frame F1 has an upper frame 30 that is connected to the upper end portions of the side frames 10 to connect the side frames 10 together.
Furthermore, the seatback frame F1 has a lower member frame 50 that connects between the side frames 10 by being attached to the lower ends of the side frames 10, as shown in FIG. Further, an S spring 60 is installed between the side frames 10 to support the back of the passenger from behind.

The upper frame 30 is a component formed in a downward U-shape when viewed from the front, and is constituted by a metal hollow pipe member. However, it is not limited to this, The upper frame 30 may be comprised with the solid member.
Both free end sides of the upper frame 30 are joined above the side frames 10, 10.
In addition, a square cylindrical pillar guide 34 that supports the headrest pillar is attached to the front surface of the horizontal portion disposed above the upper frame 30. A pair of pillar guides 34 are provided at intervals in the width direction.

Next, the side frame 10 has a spindle-shaped outer shape when viewed from the side. That is, when the side frame 10 is viewed from the side, the front end portion of the side frame 10 bulges out in a circular arc shape from a midway position in the vertical direction. Note that when the seat S is in use (more strictly speaking, when the seat back S1 is at the reference position), the side frame 10 is along a direction slightly inclined (backward inclined) with respect to the vertical direction. It extends for a long time.
Further, as described above, the free end side of the upper frame 30 is joined to one end portion (upper end portion) of the side frame 10 in the extending direction.
In the present embodiment, the side frame 10 is made of a thin steel plate, more specifically, an ultra high strength steel plate having a thickness of 1 mm or less, which contributes to weight reduction.

Next, the lower member frame 50 will be described. The lower member frame 50 is configured by processing a sheet metal, and is laid between the lower ends of the side frames 10.
Further, the upper edge portion and the lower edge portion of the lower member frame 50 are each formed to have a shape that is bent forward (hereinafter, these flange portions are referred to as “upper and lower flanges 50d, 50d”). .
The detailed configuration of the lower member frame 50 is the main configuration of this embodiment, and will be described in detail later.

A waist support member 70 is disposed on the front surface of the lower member frame 50.
The waist support member 70 is a long resin member, and is disposed along the lower member frame 50 extending along the width direction so that the longitudinal direction is along the width direction.
As the material, for example, a resin foam material such as urethane foam, polypropylene foam, and polyethylene foam may be used, and the hardness thereof is configured to be higher than the pad material P covered on the seat back frame F1. It is good to be.
For this reason, a moldability is good and a molding freedom degree improves.

Further, it is preferable that the waist support member 70 has a deflection amount equivalent to that of a metal steel plate bracket that has been conventionally used.
The waist support member 70 functions as a reinforcement member for reinforcing the strength of the lower member frame 50 at the position, and also functions as a waist support member for supporting the seated person's waist.

1 to 4 show a final arrangement position of the waist support member 70 for the sake of explanation, and the waist support member 70 according to this example is incorporated when the seat back frame F1 is assembled. It is not intended to be used independently. That is, the waist support member 70 is manufactured integrally with the pad material P, and is retrofitted to the seat back frame F1.
Since this configuration is the main configuration of the present invention, it will be described in detail later.

<Detailed configuration of waist support member>
The configuration of the waist support member 70 will be described in detail.
The waist support member 70 is a long three-dimensional bar-shaped member, and defines the arrangement member bottom surfaces 71 and 71 that define the left and right ends in the width direction, and the side surfaces across the arrangement member bottom surfaces 71 and 71. The side surface 70A is formed in a substantially prismatic shape.
The side surface 70A has an arrangement member mounting surface 72 that faces the lower member frame 50, a front surface 73 that defines the front side, an upper surface 74 that defines the upper side, and a lower surface 75 that defines the lower side. Configured.
A groove-like alignment groove 72a extending in the width direction is formed on the arrangement member mounting surface 72 in the vicinity of a substantially central portion in the vertical direction.
In addition, two upper surface recesses 74a, which are substantially rectangular recesses, are formed on the upper surface 74 in this example.
Furthermore, the front surface 73 is a gently curved curved surface, and two front surface recesses 73a, which are substantially rectangular recesses, are formed below the front surface 73.

<Detailed structure of lower member frame>
Next, a detailed configuration of the lower member frame 50 will be described with reference to FIGS. 1 to 6.
The lower member frame 50 is configured as a long rectangular steel plate that is long in the width direction.
The lower member frame 50 is formed with an alignment protrusion 50a that is projected from the back surface so as to be convex on the front surface.
The alignment protrusion 50a is formed in a shape along the inner wall surface of the alignment groove 72a so as to align with the alignment groove 72a described above.
That is, the alignment protrusion 50a is configured to be aligned with the alignment groove 72a. This “alignment” is only required to specify the position, and may be loosely fitted, or may have a function such as temporary fixing as the engaged state.
In this example, the alignment protrusion 50a is formed to be long in the width direction.
However, the formation state is not limited to this, and a configuration in which two alignment protrusions 50a are formed in the vicinity of both ends of the lower member frame may be employed.
As will be described later, in this example, it is possible to position the waist support member 70 by aligning the alignment protrusion 50a with the alignment groove 72a, but by forming the alignment protrusion 50a, (In other words, by forming an uneven shape on the flat plate), it is possible to increase the strength of the lower member frame 50 and contribute to the thinning of the lower member frame.

In addition, as described above, the formation position, the number, the formation method, and the like of the alignment protrusions 50a are not limited to this. For example, the lower member frame 50 is elongated in the width direction in the vicinity of the substantially central portion in the vertical direction. It may be configured so as to project forward so as to extend to the center, or one piece may be formed at the center in the width direction. In addition, the configuration may be a configuration in which a projection of a lightweight material is welded to the front side of the lower member frame 50, for example, instead of the configuration of placing from the back surface.
Furthermore, as an optimal application configuration, as in the present embodiment, the alignment protrusion 50a is formed to be elongated in the width direction, and the width direction length of the waist support member 70 described later is The alignment protrusion 50a may be configured to have a longer length in the width direction.
With this configuration, the waist support member 70 can be efficiently positioned on the alignment protrusion 50a.

Further, at both ends in the width direction of the lower member frame 50, notches 50b and 50b that are notched inward are formed.
And from the periphery of this notch part 50b, the edge part flange 50c which stands up ahead stands.
Since the notches 50b and 50b are formed in this way, the lower member frame 50 can be reduced in weight, and the end flanges 50c and 50c stand up from the periphery, so that the strength of the portions is increased. Can be raised. That is, it is possible to achieve both weight reduction and ensuring rigidity.

<Method of disposing waist support member>
First, the waist support member 70 will be described with reference to FIGS. 4, 7 and 8.
The waist support member 70 is formed as a hard foamed resin material.
The waist support member 70 formed in this way is inserted and integrally formed when the pad material P is foamed by a mold.
At this time, since the upper surface recess 74a and the front surface recess 73a are formed in the waist support member 70, the bonding area with the pad material P can be widened, so that the integrity is improved. That is, the waist support member 70 is preferably formed with a hardness higher than that of the pad material P. However, in order to integrate the hard member and the soft member, the contact portion area is increased in order to increase the integration efficiency. I decided to make it bigger.

  In order to improve the integration, in this example, the upper surface recess 74a and the front surface recess 73a are formed. However, the present invention is not limited to this. For example, the waist support member 70 has holes. The structure which forms a part and a slit may be sufficient.

7 and 8, when the pad material P1 is disposed, the waist support member 70 is inserted between the upper and lower flanges 50d, 50d of the lower member frame 50, and the alignment protrusions of the lower member frame 50 are aligned. The part 50a is arranged in alignment with the alignment groove part 72a of the waist support member 70 to perform positioning.
At this time, the nonwoven fabric G is interposed between the waist support member 70 and the lower member frame 50.
With this configuration, the waist support member 70 and the lower member frame 50 are not in direct contact with each other, so that noise generation due to friction during use can be effectively suppressed.

As described above, even when the lower member frame 50 is thinned and reduced in weight, the rigidity can be kept high and the lumbar support member 70 is attached to the pad material P. Since it is provided on the side and disposed at the same time as the pad material P assembly with respect to the lower member frame 50, the mounting workability is improved.
The waist support member 70 of this example functions as a reinforcing member for the lower member frame 50 and also functions as a waist support member for supporting the waist of the occupant.

DESCRIPTION OF SYMBOLS 10 Side frame 13 Side wall part 30 Upper frame 34 Pillar guide 50 Lower member frame 50a Alignment protrusion part (alignment part)
50b Notch portion 50c End flange 50d Upper and lower flange 60 S Spring 70 Lumbar support member 71 Arrangement member bottom surface 70A Side surface 72 Arrangement portion attachment surface 72a Alignment groove (matched portion)
73 Front surface 73a Front surface recess 74 Upper surface 74a Upper surface recess 75 Lower surface 80 Reclining device 81 Reclining shaft F Seat frame F1 Seat back frame F2 Seat cushion frame R Slide rail device RL Lower rail RU Upper rail S This seat (vehicle seat)
S1 Seat back S2 Seat cushion S3 Headrest P Pad material G Non-woven fabric W Skin material XL Rotating link

Claims (13)

A substantially rectangular frame seat having at least a side frame provided at both ends in the width direction of the vehicle seat and a lower member frame that bridges the lower ends of both side frames in the vehicle width direction. A vehicle seat including a back frame as a skeleton,
In the lower member frame, a waist support member made of resin is disposed,
The waist support member is a long member extending along the vehicle width direction in which the lower member frame extends, and the vehicle width direction length of the waist support member is greater than the vehicle width direction length of the lower member frame. A vehicle seat characterized by being configured to be shorter.   The vehicle seat according to claim 1, wherein the waist support member is a foamed resin material.   The vehicle seat according to claim 1, wherein the waist support member is attached to a surface side of the lower member frame facing the front of the vehicle.   The shape of the surface of the lower back support member facing the vehicle rear side is formed to match the shape of the surface of the lower member frame facing the vehicle front. The vehicle seat according to claim 1. In the lower member frame, a surface facing the front of the vehicle is formed with a matching portion formed in a hole, a concave shape or a convex shape, and
In the waist support member, a surface facing the rear of the vehicle is provided with a convex portion that penetrates the hole, or a convex or concave shape that matches the concave or convex shape, as a matched portion that matches the matching portion. The vehicular seat according to any one of claims 1 to 4 characterized by things.   The vehicle according to any one of claims 1 to 5, wherein the alignment portion formed on the lower member frame facing the waist support member extends in the vehicle width direction. Sheet.   The alignment portion formed on the lower member frame facing the waist support member extends in the vehicle width direction, and the length of the alignment portion in the vehicle width direction is the vehicle width of the waist support member. The vehicle seat according to any one of claims 1 to 6, wherein the vehicle seat is configured to be larger than a length in a direction. In the lower member frame, at least one of the vehicle upper edge and the vehicle lower edge is formed with a flange that is bent so as to extend toward the front of the vehicle.
The vehicle seat according to any one of claims 1 to 7, wherein at least one of the waist support member is restricted in the vehicle vertical direction by the flange. In the seat back frame, a pad material made of resin is arranged,
The vehicle seat according to any one of claims 1 to 8, wherein a hardness of the waist support member is higher than a hardness of the pad material. In the seat back frame, a pad material made of resin is arranged,
The vehicle seat according to any one of claims 1 to 9, wherein the waist support member is attached while being sandwiched between the lower member frame and a pad material.   11. The vehicle seat according to claim 9, wherein the formed waist support member is inserted when the pad material is formed, and is integrally formed with the pad material. 11.   The contact surface between the waist support member and the pad material is formed with at least one rough surface forming shape selected from a concave shape, a hole shape, and a slit shape. The vehicle seat according to 11. The waist support member is
13. The lower member frame according to claim 1, wherein a nonwoven fabric is interposed between the lower back support member and the lower member frame, and the lower member frame is attached to the lower member frame. Vehicle seat.

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