JP7112002B2 - seat frame - Google Patents

Description

The present invention relates to a seat frame, a vehicle seat, and a seat frame manufacturing method, and more particularly to a seat frame having a metal portion and a resin portion, a vehicle seat including the seat frame, and a seat frame manufacturing method.

2. Description of the Related Art In recent years, in order to improve the fuel efficiency of a vehicle, some vehicle seats have been made lighter by molding part or all of a seat back frame and a seat cushion frame from a resin material such as plastic.
As a seat frame for a vehicle that can ensure rigidity (described as strength in the document) while achieving weight reduction in this way, it has been proposed to form the seat frame with a resin having a double-wall structure. (see Patent Document 1).

More specifically, Patent Document 1 discloses that a seat frame consisting of a seat cushion frame and a seat back frame is formed into a double-walled structure by blow-molding resin, thereby ensuring rigidity while reducing weight. Have been described.

In addition, Patent Document 2 discloses a seat back that is lightweight, has high strength, and is manufactured at low cost by having a round pipe that is integrally embedded in the skin and the resin base material over the entire circumference. there is

JP-A-2001-231654 Japanese Utility Model Publication No. 7-16365

However, as in the vehicle seat frame described in Patent Document 1, it is possible to reduce the weight by molding with resin, but if only the resin has a double wall structure, it will not be able to withstand the impact applied to the seat frame in the event of an accident. It was difficult to ensure sufficient rigidity.
Further, in the vehicle seat back described in Patent Document 2, a round pipe is embedded in a resin base material, but it is difficult to ensure rigidity against impact such as a side collision. In addition, since the resin base material is in contact only with the outer peripheral surface of the round pipe, the bonding strength between the round pipe and the resin base material may not be sufficient.
In addition, only one round pipe is embedded (frame-shaped) over the entire circumference of the resin base material that constitutes the seat back. Therefore, when the headrest stay as a tubular member is attached to the round pipe, it is attached to one side of the round pipe, so that the attachment strength is sometimes insufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a seat frame that is lightweight and capable of ensuring rigidity, a vehicle seat, and a seat frame manufacturing method. be.
Another object of the present invention is to increase the bonding strength between the resin portion and the metal portion used in the seat frame.
Another object of the present invention is to increase the mounting strength of the tubular member to the frame member.

According to the seat frame of the present invention, the seat frame for a vehicle seat includes a frame member, wherein the frame member is composed of a plurality of metal portions arranged side by side in the front-rear direction of the vehicle seat. The outer surface of the metal portion is covered with a resin portion made of resin, and the resin portion includes a plurality of first extending portions covering the respective outer surfaces of the plurality of metal portions. , and a second extension portion connecting the plurality of first extension portions, and each of the plurality of first extension portions directly abuts the outer surface of the metal portion and conforms to the shape thereof. It is solved by covering the metal part along .

Moreover, it is preferable that a hexagonal honeycomb portion is formed in the second extending portion .

Moreover, the honeycomb portion preferably has a hexagonal hole penetrating through the second extending portion .

Moreover, it is preferable that more hexagonal holes are formed in the lower portion than in the upper portion .

Further, it is preferable that a metal material is disposed as a core material inside the resin portion .

Further, the resin portion preferably holds a pressure-receiving member that supports an occupant between the plurality of metal portions arranged side by side in the front-rear direction.

Moreover, it is preferable that the thickness of the second extending portion is smaller than the diameter of the metal portion .

Furthermore, it is preferable that a space is provided in the second extending portion along the longitudinal direction of the metal portion .

Further, it is preferable that the resin portion that holds the pressure receiving member is formed with a bulging portion .

Moreover, it is preferable that the resin portion is provided with a hexagonal hole portion at an intermediate portion in the longitudinal direction of the metal portion between the plurality of metal portions provided side by side in the front and rear directions.

According to the seat frame of the present invention, the weight can be reduced by the resin portion, and the rigidity can be increased in a wide range by the metal portion.
Moreover, the contact area between the metal portion and the resin increases, and the bonding strength can be increased.
In addition, the positioning of the metal parts is facilitated, and work efficiency during assembly is enhanced.
Moreover, it is possible to prevent the resin portion from peeling off from the metal portion.
Also, the rigidity of the frame member can be effectively increased.
Also, it is possible to easily form a highly rigid seat frame.
Moreover, the resin portion can be easily formed between the hollow portion and the outside of the metal portion, and the rigidity can be enhanced.
Also, the degree of freedom in the shape of the seat frame can be increased.
Also, the strength for holding the tubular member can be increased.
Furthermore, the seat frame can be made lighter.
Also, the cushioning property can be enhanced.
Furthermore, it is possible to prevent the resin from entering the pipe, thereby increasing the welding strength between the pipe and other members and improving the welding workability.
Moreover, the mounting strength between the linear frame and the resin portion can be increased, the rigidity of the frame member can be increased, and the mounting workability of the linear frame can be improved.
In addition, it is possible to improve the workability of assembling the pressure receiving member to the resin portion, and to prevent the pressure receiving member from being unexpectedly removed from the resin portion.
In addition, it is possible to provide a vehicle seat that is lightweight while ensuring rigidity.
Furthermore, the cooling time of the resin can be shortened while molding the resin portion, and the production efficiency of the seat frame can be improved.
Furthermore, the frame member can be molded while the resin portion and the metal portion are joined by insert molding, which facilitates the manufacturing work.

1 is a schematic perspective view of a vehicle seat according to this embodiment; FIG. It is a schematic perspective view showing a seat frame according to the present embodiment. It is a schematic perspective view showing a side frame of the seatback frame according to the present embodiment. It is a schematic perspective view which shows the side frame except the resin part. FIG. 11 is a schematic perspective view showing a side frame according to a first modified example from which a resin portion is removed; FIG. 11 is a schematic perspective view showing a side frame according to a second modified example from which a resin portion is removed; FIG. 11 is a schematic perspective view showing a side frame according to a third modified example; FIG. 11 is a schematic perspective view showing a side frame according to a fourth modified example; FIG. 11 is a schematic perspective view showing a side frame according to a fifth modified example; FIG. 11 is a schematic perspective view showing a side frame according to a sixth modified example; FIG. 10B is a view showing a cross-sectional view taken along line BB of FIG. 10A; FIG. 21 is a schematic perspective view showing a side frame according to a seventh modified example; FIG. 21 is a schematic perspective view showing a side frame according to an eighth modified example; FIG. 21 is a schematic perspective view showing a side frame according to a ninth modification; It is a figure which shows the XIV-XIV cross section of the side frame shown in FIG. FIG. 21 is a diagram showing a cross section of a side frame according to a tenth modified example; FIG. 21 is a diagram showing a cross section of a side frame according to an eleventh modified example; FIG. 21 is a diagram showing a cross section of a side frame according to a twelfth modification; FIG. 21 is a diagram showing a cross section of a side frame according to a thirteenth modified example; FIG. 21 is a schematic perspective view showing a side frame according to a fourteenth modified example from which a resin portion is removed; FIG. 4 is a schematic diagram showing a mold clamping process when injection molding a side frame; It is a schematic diagram which shows an injection process. It is a schematic diagram which shows a cooling process. FIG. 11 is a perspective view showing a side frame of the seat cushion frame according to the second embodiment; 21. It is a figure which shows the XXII-XXII cross section of FIG. 21 of the seat cushion frame which concerns on 2nd Embodiment. FIG. 11 is a schematic perspective view showing a seat frame according to a third embodiment; It is a typical perspective view showing a seat back frame. FIG. 24 is a sectional view showing the XXV-XXV section of the headrest stay of FIG. 23; FIG. 4 is a schematic front cross-sectional view showing a hook that is formed on the seatback frame and holds an S spring; FIG. 24 is a cross-sectional view of a hook according to a fifteenth modification, and is a cross-sectional view showing a portion corresponding to the XXVII-XXVII cross section of FIG. 23; FIG. 24 is a schematic cross-sectional view showing the XXVIII-XXVIII cross section of the hook shown in FIG. 23; FIG. 4 is a schematic perspective view showing a seat cushion frame; FIG. 21 is a schematic perspective view showing a seat cushion frame according to a sixteenth modification; FIG. 21 is a perspective view showing an upper pipe and a lower pipe according to a seventeenth modification;

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle seat, a seat frame, and a seat frame manufacturing method according to one embodiment (hereinafter referred to as the present embodiment) of the present invention will be described below with reference to the drawings.
The seat frame according to the present embodiment is composed of a resin portion and a metal portion in order to achieve weight reduction while maintaining rigidity. A vehicle seat includes the seat frame, and the seat frame manufacturing method is a method for efficiently manufacturing the seat frame.

The embodiments described below are merely examples for facilitating understanding of the present invention, and do not limit the present invention. That is, the shape, size, arrangement, etc. of the members described below can be changed and improved without departing from the scope of the present invention, and the present invention naturally includes equivalents thereof.
Further, in the following description, the vertical direction means the vertical direction of the sheet. The front-rear direction is a direction that coincides with the traveling direction of the vehicle, and corresponds to a direction that intersects the extension direction according to the present invention. The width direction is the direction along the width of the sheet.

<<First Embodiment>>
A vehicle seat S and a seat frame SF according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a schematic perspective view of the vehicle seat S, FIG. 2 is a schematic perspective view of the seat frame SF, FIG. 3 is a schematic perspective view of the side frame 22 of the seat back frame 1, and FIG. 4 is a schematic perspective view showing the side frame 22 with the resin portion 22d removed; FIG.

As shown in FIG. 1, the vehicle seat S according to this embodiment includes a seat back S1, a seat cushion S2, and a headrest S3. The seat back S1 and the seat cushion S2 are constructed by arranging cushion pads 1a and 2a as cushion members on the seat frame SF and covering them with skin materials 1b and 2b, respectively.
The headrest S3 has a structure in which a cushion pad 3a as a cushion member is arranged on a core material (not shown) and covered with a skin material 3b.

As shown in FIGS. 1 and 2, the seat frame SF has, as main components, a seat back frame 1 that forms a seat back S1 and a seat cushion frame 2 that forms a seat cushion S2.

The seatback frame 1 includes side frames 22 (details of which will be described later) extending in the vertical direction and provided on both sides in the seat width direction, and side frames 22 extending in the seat width direction and provided on both sides. 22, and lower frames 35 extending in the seat width direction and fixed to the lower portions of the side frames 22 provided on both sides.

The upper frame 21 has a pipe shape and is formed in an inverted U shape when viewed from the front of the seat, and a pillar (not shown) of the headrest S3 is attached thereto. The upper frame 21 has lower ends on both sides in the seat width direction fixed to the upper portions of the side frames 22 .

The lower frame 35 has a long plate shape, is fixed to the lower side frame portion 22a as a mounting bracket at the lower portion of the side frame 22, and has a function of increasing the rigidity of the seatback frame 1 as a whole.

As shown in FIGS. 3 and 4, the side frame 22 includes a lower side frame portion 22a provided at the bottom, and one portion of a metal portion that is fixed to the front and rear of the upper portion of the lower side frame portion 22a and extends upward. and a resin portion 22d joined to cover the upper portion of the lower side frame portion 22a, the front pipe 22b, and the rear pipe 22c.
Note that the seat back frame 1, the seat cushion frame 2, or the side frame 22, or the seat back frame 3, the seat cushion frames 4, 5, or the side frames 23, 24, 26, 27, 28, 29, 30, 31, which will be described later. , 32, 33, 34, 40, 70, 71, 72 or the back frame member 3c or the front frames 4a, 4b correspond to frame members according to the present invention.

The lower side frame portion 22a, the front pipe 22b and the rear pipe 22c shown in FIG. 4 are made of a metal material such as aluminum alloy, magnesium alloy or carbon steel.
Here, the metal in the present invention means a material having a higher rigidity than resin, and in the present embodiment, particularly aluminum alloy, magnesium alloy, carbon steel, or the like.
Each of the front pipe 22b and the rear pipe 22c corresponds to a metal portion according to the present invention. are arranged.
A hollow portion 22h is formed in each of the front pipe 22b and the rear pipe 22c along the extending direction.

On the other hand, the resin portion 22d is made of glass fiber reinforced plastic.
Here, the resin according to the present invention may be formed of a resin material other than glass fiber reinforced plastic, such as carbon fiber reinforced plastic (CFRP) or plastic without carbon fiber.

More specifically, the resin portion 22d includes a first extension portion 22e that extends in the vertical direction, and a second extension portion 22f that connects the first extension portions 22e provided on the front and rear sides of the side frame 22 in the front-rear direction. Prepare.
The first extending portion 22e covers the outer surface of the upper portion of the lower side frame portion 22a and the outer surfaces of the front pipe 22b and the rear pipe 22c excluding the upper surfaces, and extends along the front pipe 22b and the rear pipe 22c. there is
The second extending portion 22f extends in the front-rear direction and connects the first extending portions 22e provided on the front and rear sides of the side frame 22. As shown in FIG.

In this manner, the resin portion 22d covers the entire area except the upper portion of the lower side frame portion 22a and the upper surfaces of the front pipe 22b and the rear pipe 22c, and is continuously formed in the vertical and longitudinal directions. That is, the resin portion 22d is formed so as to straddle between the front pipe 22b, the rear pipe 22c, and the lower side frame portion 22a.
Since the resin portion 22d is formed up to the upper portion of the lower side frame portion 22a, the front pipe 22b and the rear pipe 22c can be fixed to the lower side frame portion 22a without welding. Furthermore, the first extending portion 22e of the resin portion 22d extends along the extending direction of the front pipe 22b and the rear pipe 22c, and the contact area between them is large. It is difficult to peel off from the pipe 22c.

The resin portion 22d is formed thicker than the front pipe 22b and the rear pipe 22c, and is attached so as to span the front and rear pipes 22b and 22c.
In the resin portion 22d, the portion formed between the front pipe 22b and the rear pipe 22c is thicker than the portion covering the front pipe 22b or the rear pipe 22c.
Since the resin portion 22d is formed in this way, the portion of the metal material can be reduced, so that the weight can be reduced and the rigidity can be provided.

In this way, the side frame 22 has a lower side frame portion 22a, a front pipe 22b, and a rear pipe 22c, which are made of a metal material, in one portion thereof, and has a wide range of rigidity, while the other portion thereof is made of a resin portion 22d. Weight reduction is achieved by providing

The resin portion 22d, the upper portion of the lower side frame portion 22a, the front pipe 22b and the rear pipe 22c are integrally formed by insert molding.
Specifically, the lower side frame portion 22a, the front pipe 22b, and the rear pipe 22c are installed in advance in a mold having a predetermined shape, and molten resin is poured into the mold to form the resin portion 22d and the lower side frame portion. 22a, the front pipe 22b and the rear pipe 22c are joined. Thus, insert molding makes it possible to easily join them in a stable shape.

<First and Second Modifications>
In the side frame 22 according to the above embodiment, the front pipe 22b and the rear pipe 22c are formed so as to extend upward from the front and rear of the upper portion of the lower side frame portion 22a. The present invention is not limited to
Side frames 23 and 24 according to first and second modified examples of other configurations will be described with reference to FIGS. 5 and 6. FIG.
Here, FIG. 5 is a schematic perspective view showing the side frame 23 according to the first modified example without the resin portion 22d, and FIG. 6 is a schematic view showing the side frame 24 according to the second modified example without the resin portion 22d. It is a perspective view.
In the following description, members having similar shapes and functions are denoted by the same reference numerals to eliminate overlapping descriptions and clarify differences.

As shown in FIG. 5, the side frame 23 according to the first modification includes a U-shaped pipe 23b formed in a U shape when viewed from the side of the seat. This U-shaped pipe 23b corresponds to the metal part according to the present invention, and includes the front pipe 22b and the rear pipe 22c of the side frame 22 shown in FIG.

In the side frame 23 having such a configuration, the U-shaped pipe 23b can be easily positioned when the U-shaped pipe 23b is fixed to the upper portion of the lower side frame portion 22a.
That is, in the side frame 22 shown in FIG. 4, when fixing the front pipe 22b and the rear pipe 22c to the lower side frame portion 22a, they must be positioned and joined.
On the other hand, in the side frame 23 shown in FIG. 5, by positioning only the U-shaped pipe 23b, the positions of the front and rear parts constituting the U-shaped pipe 23b can be defined, and the efficiency of the assembly work is improved.

The side frame 24 according to the second modification is not a pipe-shaped front pipe 22b and a rear pipe 22c, but as shown in FIG. It has a post 24b and a rear post 24c.
Specifically, the front pillar 24b and the rear pillar 24c each correspond to a metal portion according to the present invention, and the open sides of the U-shape face each other, and continuously upward from the front and back of the upper portion of the lower side frame portion 22a. extended.

Thus, in the side frame 24 having the U-shaped front column 24b and rear column 24c, the rigidity is increased, and the contact area with the resin portion 22d is increased, thereby increasing the joint strength. .
Furthermore, since the front column 24b and the rear column 24c are plate-shaped rather than pipe-shaped, they can be integrally formed by press working without being welded to the lower side frame portion 22a. Therefore, if the side frame 24 having the front pillar 24b and the rear pillar 24c is used, molding becomes easy, and the assembly work can be performed with high efficiency.
The front column 24b and the rear column 24c, which are metal portions, only need to have a large contact area with the resin portion 22d, and are not limited to having a U-shaped cross section. good too.

<Third modification>
The resin portion 22d according to the above embodiment has been described as being continuously formed in the front, rear, up and down directions so as to cover the front pipe 22b, the rear pipe 22c, and the upper portion of the lower side frame portion 22a. The present invention is not limited to

For example, as shown in FIG. 7, the side frame 26 according to the third modification is characterized in that the resin portion 26d partially forms a space 26e.
Specifically, the resin portion 26d of the side frame 26 is formed in the front, rear, up and down directions so as to cover the front pipe 22b, the rear pipe 22c, and the upper portion of the lower side frame portion 22a. It is the same as the part 22d.
The difference between the resin portion 26d and the resin portion 22d is that a space 26e is formed through the resin portion 26d in the seat width direction between the front pipe 22b and the rear pipe 22c at the upper and lower central portions of the resin portion 26d. It is a point that forms

By forming the space 26e in the side frame 26 in this way, it is possible to reduce the weight of the seat frame SF, and in the seat width direction, between the seat outer side and the seat inner side, an electronic device can be provided. It is possible to pass the wiring for operating the

<Fourth modification>
In the side frame 26 according to the third modified example, although the space 26e is formed, the weight can be reduced, but the rigidity may be lower than the design condition.
Therefore, as shown in FIG. 8, a rib 27a may be formed across the space 26e.

A side frame 27 according to a fourth modified example having this rib 27a will be described with reference to FIG. Here, FIG. 8 is a schematic perspective view showing the side frame 27. As shown in FIG.
The rib 27a corresponds to a reinforcing portion according to the present invention, and extends vertically in a zigzag manner so as to alternately contact the front pipe 22b and the rear pipe 22c within the space 26e.

If the ribs 27a are formed integrally with the resin portion 26d, the front pipe 22b, the rear pipe 22c, and the lower side frame portion 22a, they can be assembled efficiently.
On the other hand, the rib 27a and the frame body fitted in the space 26e are put into the space 26e of the resin portion 26d already attached to the front pipe 22b, the rear pipe 22c and the lower side frame portion 22a as a unit, and are welded to the resin portion 26d for retrofitting. You may make it
The ribs 27a may be formed only of resin for weight reduction, but may be provided with a metal material as a core material inside. By doing so, the rigidity can be increased.

<Fifth Modification>
In the side frame 26 according to the fourth modified example, the space 26e of the resin portion 26d is provided with the rib 27a for reinforcement, but the present invention is not limited to such a configuration.
For example, as shown in FIG. 9, a side frame 28 having a honeycomb portion 28a for reinforcement may be employed in the space 26e.
Next, a side frame 28 according to a fifth modified example will be described with reference to FIG. Here, FIG. 9 is a schematic perspective view showing the side frame 28. As shown in FIG.
The honeycomb portion 28a corresponds to the reinforcing portion according to the present invention, and is composed of a regular hexagonal hole portion 28b penetrating in the seat width direction and a partition wall portion 28c formed to define the hole portion 28b.
The honeycomb portion 28a eliminates the need for a material corresponding to the volume of the hole portion 28b, so that the weight can be reduced, and the structure can maintain high rigidity against the load in the seat width direction.

If the honeycomb portion 28a is formed integrally with the resin portion 26d, the front pipe 22b, the rear pipe 22c, and the lower side frame portion 22a, they can be assembled efficiently.
On the other hand, the honeycomb portion 28a and the frame body fitted in the space 26e are put into the space 26e of the resin portion 26d already attached to the front pipe 22b, the rear pipe 22c and the lower side frame portion 22a as a unit, and are welded to the resin portion 26d. It may be retrofitted.

Furthermore, the honeycomb portion 28a may be composed of a plurality of layers, and the positions of the hole portions 28b and the partition wall portions 28c may be shifted to combine layers in the sheet width direction. Rigidity can be made higher by doing in this way.

Further, the honeycomb portion 28a may be formed only of resin for weight reduction, but may be provided with a metal material as a core material inside. In this way, rigidity can be made higher.

<Sixth modification>
In the side frame 26 according to the fifth modified example, the space 26e of the resin portion 26d is provided with the honeycomb portion 28a having the hole portion 28b and the partition wall portion 28c continuous in the seat width direction. The present invention is not limited to such a configuration.
For example, as shown in FIGS. 10A and 10B, a side frame 29 may be employed in which a honeycomb portion 29a having vertically continuous hole portions 29b and partition wall portions 29c is provided in the space 26e.
Next, a side frame 29 according to a sixth modification including this honeycomb portion 29a will be described with reference to FIGS. 10A and 10B. Here, FIG. 10A is a schematic perspective view showing a side frame 29 according to a sixth modification, and FIG. 10B is a cross-sectional view taken along line BB in FIG. 10A.

The honeycomb portion 29a corresponds to the reinforcing portion according to the present invention, and is composed of a regular hexagonal hole portion 29b penetrating vertically and a partition wall portion 29c formed to define the hole portion 29b.
The honeycomb portion 29a eliminates the need for a material corresponding to the volume of the hole portion 29b, so that the weight can be reduced, and the structure can maintain high rigidity against the load in the vertical direction.

The frame body fitted in the honeycomb portion 29a and the space 26e is inserted into the space 26e of the resin portion 26d already attached to the front pipe 22b, the rear pipe 22c and the lower side frame portion 22a, and is welded to the resin portion 26d for retrofitting. installed.
Further, the honeycomb portion 29a may be composed of a plurality of layers, and the positions of the hole portions 29b and the partition wall portions 29c may be shifted to combine them vertically in layers. By doing so, the rigidity can be further increased.

Further, the honeycomb portion 28a may be formed only of resin for weight reduction, but may be provided with a metal material as a core material inside. In this way, rigidity can be made higher.

<Seventh Modification>
The side frame 28 or the side frame 29 according to the fifth and sixth modifications has been described as including the honeycomb portion 28a or the honeycomb portion 29a as the reinforcing member according to the present invention.
However, the present invention is not limited to such a configuration as long as a predetermined rigidity can be maintained while reducing materials.
For example, instead of the honeycomb portion 28a having regular hexagonal hole portions 28b shown in FIG. 9, a side frame 70 having a punch plate-shaped resin plate 70a having circular hole portions 70b as shown in FIG. 11 is employed. You may

Specifically, the resin plate 70a of the side frame 70 corresponds to the reinforcing portion according to the present invention, and includes a plurality of circular holes 70b and partition walls 70c formed to separate them.
In this way, high rigidity can be ensured by attaching the resin plate 70a to the space 26e of the resin portion 26d or integrally molding it with the resin portion 26d.
Furthermore, the hole portions 28b and 29b having a regular hexagonal shape and the hole portion 70b having a circular shape are not limited, and a hole portion having a triangular shape, a square shape, or other shape may be provided.

<Eighth and ninth modifications>
Further, side frames 71 and 72 including Miura-fold (registered trademark)-like portions, which are configured to be lightweight while ensuring high rigidity without forming holes 28b, 29b, and 70b, are shown in FIGS. 13 for explanation.
Here, FIG. 12 is a schematic perspective view showing a side frame 71 according to an eighth modification, and FIG. 13 is a schematic perspective view showing a side frame 72 according to a ninth modification.
The side frame 71 has an uneven portion 71a as a reinforcing portion formed in a diamond-cut shape by combining a plurality of triangles of a predetermined shape.
Further, the side frame 72 has an uneven portion 72a as a reinforcing portion formed by combining a plurality of parallelograms having a predetermined shape.
In this way, the side frame 71 or the side frame 72 has the uneven portions 71a and 72a, so that the rigidity can be increased, and the thickness and weight can be reduced.

<Tenth to thirteenth modifications>
Next, as structural examples different from the side frame 22, the side frame 30 according to the tenth modification having the resin portion 30d joined to the front pipe 22b and the rear pipe 22c, and the eleventh modification not having the front pipe 22b. The side frame 31 according to FIG. 14 to FIG. Description will be made with reference to FIG.
Here, FIG. 14 is a view showing a cross section XIV-XIV of the side frame 22 shown in FIG. 3, FIG. 15 is a view showing a cross section of the side frame 30, and FIG. 16 is a view showing a cross section of the side frame 31. 17 is a cross-sectional view of the side frame 32, and FIG. 18 is a cross-sectional view of the side frame 34. As shown in FIG.

As shown in FIG. 14, the resin portion 22d of the side frame 22 according to the above embodiment is formed continuously in the front-rear direction, covering the peripheral surfaces of the front pipe 22b and the rear pipe 22c. Since the resin portion 22d covers the peripheral surfaces of the front pipe 22b and the rear pipe 22c in this way, it is firmly attached to them.
On the other hand, as long as the resin portion 22d has a high strength and sufficient mounting strength can be ensured with the front pipe 22b and the rear pipe 22c, the structure is not limited to such a structure, and as shown in FIG. Alternatively, the facing peripheral surfaces of the front pipe 22b and the rear pipe 22c may be partially joined together by the resin portion 22d.
By doing so, it is possible to reduce the amount of material required by not covering the entire periphery of the front pipe 22b and the rear pipe 22c.

Furthermore, as shown in FIGS. 16 and 17, the resin portions 31d and 32d extend to the positions where the front pipe 22b or the rear pipe 22c were provided, without providing the front pipe 22b or the rear pipe 22c. configuration may be employed.
Specifically, the resin portion 31d is joined to the rear pipe 22c and extends forward from the rear pipe 22c to a position corresponding to the front pipe 22b.
Similarly, the resin portion 32d is joined to the front pipe 22b and extends rearward from the front pipe 22b to a position corresponding to the rear pipe 22c.
In this way, the metal material such as carbon steel used for one of the front pipe 22b or the rear pipe 22c can be reduced, and a high weight saving effect can be obtained.

Alternatively, like the side frame 34 shown in FIG. 18, a rearwardly extending resin portion 34d may be formed integrally with a front post 24b having a U-shaped cross section extending vertically only from the front side. .
In particular, the rear pillar 34c is formed so that the rear side without the front pillar 24b made of metal has the same outer shape as the one side with the front pillar 24b, so that the rigidity is enhanced.

In the above-described embodiment, resin portions 22d, 26d, and 30d are formed integrally with the front pipe 22b, the rear pipe 22c or the front pillar 24b, and the lower side frame portion 22a, which can be molded by a mold. , 31d, 32d, and 34d are insert-molded, joining and molding can be performed at the same time, so that working efficiency is enhanced.

When the front pipe 22b and the rear pipe 22c are respectively provided, the front pipe 22b may be formed integrally with the upper frame 21 and the rear pipe 22c may be formed integrally with the lower frame 35, or vice versa. may be formed by a combination of
By doing so, the number of parts can be reduced and the assembly work can be facilitated.

<14th Modification>
In the above description, the presence or absence of holes in the peripheral surfaces of the front pipe 22b, the rear pipe 22c, and the U-shaped pipe 23b was not mentioned, but as illustrated in FIG. The U-shaped pipe 23b may have an introduction hole 33a on the peripheral surface of the U-shaped pipe 23b. Here, FIG. 19 is a schematic perspective view showing a part of the side frame 33 according to the fourteenth modification, excluding the resin portions 22d, 26d, 30d, 31d, and 32d.

Five introduction holes 33a are formed in the U-shaped pipe 23b forming the side frame 33 so as to connect to the hollow portion 22h from the side surfaces facing each other in the front-rear direction.
Since the introduction hole 33a is formed in this way, when the resin parts 22d and 26d are injection molded, the resin parts 22d and 26d pass through the introduction hole 33a and reach the hollow portion 22h of the U-shaped pipe 23b. , the bonding strength can be increased.
Note that the introduction hole 33a is not limited to the U-shaped pipe 23b, and may be formed in the front pipe 22b and the rear pipe 22c.

It should be noted that, without forming such an introduction hole 33a in the U-shaped pipe 23b, the front pipe 22b, and the rear pipe 22c, the molten resin, which is the base of the resin portions 22d, 26d, 30d, 31d, and 32d, is introduced into the mold. After pouring, the cooling speed of the resin portions 22d and 26d may be increased by passing water or air through the hollow portion 22h.
A method of manufacturing the side frame 22 and the like will be described with reference to FIGS. 20A to 20C.
Here, FIG. 20A is a schematic diagram showing the mold clamping process when injection molding the side frame 22, FIG. 20B is a schematic diagram showing the injection process, and FIG. 20C is a schematic diagram showing the cooling process.
First, as shown in FIG. 20A, the front pipe 22b, the rear pipe 22c, and the lower side frame portion 22a are arranged in a mold M installed in an injection molding machine (not shown), and the mold is clamped.
Next, as shown in FIG. 20B, molten resin is poured around the front pipe 22b, the rear pipe 22c and the lower side frame portion 22a.
Then, as shown in FIG. 20C, water or air is flowed into the hollow portions 22h of the front pipe 22b and the rear pipe 22c to cool the molten resin, thereby molding the resin portions 22d, 26d, 30d, 31d, and 32d. make sure to
According to such a process, it is possible to improve the production efficiency of the side frames 22 and the like.

<<Second Embodiment>>
In the above embodiment, the resin portions 22d, 26d, 30d, 31d, and 32d are used to reduce the weight of the seatback S1 while maintaining its rigidity. However, the present invention is applicable only to the seatback S1. Not limited.
For example, the side frame 40 that constitutes the seat cushion frame 2 may have the same configuration and the direction thereof may be changed from the up-down direction to the front-rear direction.

Further, an example of joining a resin cover 41 to the side surface of the side frame 40 of the seat cushion frame 2 will be described below with reference to FIGS. 21 and 22. FIG.
Here, FIG. 21 is a perspective view showing the side frame 40 of the seat cushion frame 2 according to the second embodiment, and FIG. 22 shows the XXII-XXII section of FIG. 21 of the seat cushion frame 2 according to the second embodiment. It is a diagram.

The side frame 40 includes a beam member 40a composed of a lower edge 40b, an upper edge 40c, and an intermediate portion 40d therebetween, and a cover 41 made of a resin material and covering the outside of the beam member 40a in the seat width direction. Consists of

The beam member 40a corresponds to the metal portion according to the present invention, and has a U-shaped cross section (bracket shape) by bending the lower edge 40b and the upper edge 40c toward the inside of the seat, and extends in the front-rear direction. is doing. A cover 41 corresponding to the resin portion according to the present invention is arranged outside the side frame 40 in the seat width direction.

The cover 41 corresponds to the resin portion according to the present invention, and a connecting portion 41b extending outward in the seat width direction is formed on at least a part of the outer side surface of the intermediate portion 40d of the beam member 40a. A lower edge 41a and an upper edge 41c are formed at the top and bottom of the tip side of the .
According to the above configuration, the cover 41 can improve the appearance, and by forming the cover 41 from resin, it is possible to reduce the weight compared to forming it from a metal material.
A resin portion similar to the resin portion 22d is provided so as to cover at least a portion of the beam member 40a, and the cover 41 is integrally formed therewith, thereby improving manufacturing efficiency.

<<Third Embodiment>>
A seat frame F1 according to a third embodiment as another embodiment of the present invention will be described with reference to FIGS. 23 to 29. FIG.
Here, FIG. 23 is a schematic perspective view showing the seat frame F1 according to the third embodiment, FIG. 24 is a schematic perspective view showing the seatback frame 3, and FIG. 26 is a schematic front sectional view showing a hook 50 formed on the seat back frame 3 and holding the S spring 36. FIG. 27 is a cross-sectional view of a hook 51 according to a fifteenth modification, showing a cross-sectional view corresponding to the XXVII-XXVII cross-section of FIG. 23, and FIG. 29 is a schematic perspective view showing the seat cushion frame 4. FIG.

The seat frame F1 has, as main components, a seat back frame 3 that forms the seat back S1 and a seat cushion frame 4 that forms the seat cushion S2.

(About the seat cushion frame)
The seat cushion frame 4, as shown in FIGS. and a front frame 4a formed across the frames 75a and 75b.

The connecting frames 75 a and 75 b are made of metal, have high rigidity, and form side frames of the seat cushion frame 4 .
The connecting frames 75a and 75b are formed with stepped portions that protrude rearward of the seat. This stepped portion functions as a weak portion that deforms when the vehicle is impacted, and functions to reduce the load applied to the seated occupant.
Instead of the stepped portion, the weakened portion may be formed by a connecting shaft 75d extending in the seat width direction and having both ends joined to the connecting frame 75a and the connecting frame 75b.
Specifically, the joint between both ends of the connecting shaft 75d and the connecting frames 75a and 75b inevitably increases the rigidity of the joint.
On the one hand, the stiffness around the joint is relatively low.
Therefore, the peripheral portions of the connection frames 75a and 75b that are joined to the connection shaft 75d can function as weakened portions.

Two engagement holes 75c are formed in the front and rear portions of the connecting frames 75a and 75b at the front ends of the connecting frames 75a and 75b to be connected to the connecting portion 76a of the pan frame 76, which will be described later. It is
When the pan frame 76, which will be described later, is integrally molded, the molten resin of the pan frame 76 enters the engagement hole 75c, thereby increasing the contact area between the connecting portion 76a and the connecting frames 75a and 75b, thereby enhancing the connecting strength. becomes.
The front frame 4a is composed of an upper pipe 48a and a lower pipe 48b as a framework, and an insert-molded pan frame 76 having these pipes inside.
The upper pipe 48a and the lower pipe 48b correspond to one and a linear frame of the metal part according to the present invention.
The pan frame 76 is made of carbon resin or glass fiber reinforced plastic, and corresponds to one of the resin parts and the plate-like pan frame according to the present invention, and is a member that constitutes the front portion of the seat cushion frame 4. It is connected to the connecting frames 75a and 75b by connecting portions 76a at the rear ends on both sides in the width direction.
S springs 36 as pressure-receiving members are provided in the seat width direction between connection portions 76a on both sides of the connecting frames 75a and 75b and the pan frame 76 in the seat width direction. A mounting structure for the S spring 36 will be described later.

The upper pipe 48a is formed in a U-shape (U-shape) when viewed from the top, with the ends thereof connected to the front upper portions of the connecting frames 75a and 75b. Specifically, the upper pipe 48a extends forward from both end portions, bends inward in the seat width direction and extends, then bends downward and further bends inward in the seat width direction so that the central portion in the seat width direction It is formed to extend linearly.
A portion of the upper pipe 48a formed in this manner is bent and extends inward in the seat width direction at the upper portion of the seat cushion frame 4, thereby enhancing rigidity. Therefore, the amount of displacement of the seat cushion frame 4 can be kept small.

The lower pipe 48b is formed in a trapezoidal shape when viewed from above, with the ends thereof connected to the front lower portions of the connecting frames 75a and 75b. Specifically, the lower pipe 48b extends forward from both end portions with a length longer than that of the upper pipe 48a, and then bends upward and slightly inward in the seat width direction so that the central portion in the seat width direction extends from the upper pipe 48a. It is formed to extend linearly at a position higher than the central portion in the seat width direction.

In this manner, the upper pipe 48a is formed shorter forward than the lower pipe 48b, and the upper pipe 48a is positioned below the lower pipe 48b at the center in the seat width direction. It has a configuration that makes it easy to avoid the occurrence of the submarine phenomenon at times.

A portion of the upper pipe 48a behind the portion bent inward in the seat width direction from the upper position and a portion of the lower pipe 48b therebelow are supported by a connection bracket (not shown).
This connection bracket is rotatably attached to a link of a seat lifter (not shown).

A link of a seat lifter (not shown) and a connecting bracket (not shown) are rotatably attached by a resin bush (not shown) integrally formed with the link and a rotary shaft that passes through the bush.
In particular, the portion of the bush that abuts on the seating surface of the head of the rotating shaft is made thicker than the other portions to prevent deviation of the center of rotation and increase rigidity. It is heightened.

The rear end sides of the upper pipe 48a and the lower pipe 48b on both sides in the seat width direction are welded to the upper and lower sides of the connecting frames 75a and 75b on both sides in the seat width direction on the inner side in the seat width direction.
In addition, portions of the upper pipe 48a and the lower pipe 48b that extend linearly from the connecting frame 75a and the connecting frame 75b on both sides in the seat width direction are formed at positions substantially overlapping in the seat vertical direction.
Further, it is preferable that the rear end sides of the upper pipe 48a and the lower pipe 48b are formed so as to be crushed in the radial direction. If the upper pipe 48a and the lower pipe 48b are formed in this manner, a welding margin is formed between them and the connection frames 75a and 75b, and joint strength can be increased.

In the above description, only the pan frame 76 of the seat cushion frame 4 is made of resin material, but other parts may be made of resin material.
For example, a gear of a seat lifter (not shown) and a link connected to the gear may be composed of a metal portion and a resin portion into which the metal portion is inserted. In this way, the weight can be reduced by using the resin portion instead of a part of the metal portion.

(About the seat back frame)
The seat back frame 3 includes a resin frame 38 as a resin portion having a U-shape in front view with the open side facing downward, and a resin frame 38 integrally molded to function as a framework. It is mainly provided with a metal front pipe 37a and a rear pipe 37b corresponding to one of the.
Further, the seatback frame 3 includes lower side frame portions 22a provided at the lower ends of the resin frame 38 on both sides in the seat width direction and joined to the front pipe 37a and the rear pipe 37b, and lower side frame portions on both sides in the seat width direction. 22a and a lower member 39 that spans over.

Here, it is assumed that the resin frame 38, the front pipe 37a, the rear pipe 37b, the lower side frame portions 22a, and the lower member 39 constitute the back frame member 3c corresponding to the frame member according to the present invention.

The lower member 39 is composed of a plate-like metal member and a resin member that is insert-molded with the metal member inside. Ribs (not shown) are formed on the surface of the resin member to increase rigidity. preferably.

The front pipe 37a and the rear pipe 37b as linear frames are formed in a U-shape (inverted U-shape) with the lower side being open when viewed from the front. The portions on both sides in the direction are formed at positions substantially overlapping each other in the seat front-rear direction.
The upper part of the front pipe 37a extends in the seat width direction, and as shown in FIGS. It is formed at a position lower than the upper part extending to the

The lower end portions of the front pipe 37a and the rear pipe 37b on both sides in the seat width direction are welded to the front and rear inner surfaces of the lower side frame portions 22a on both sides in the seat width direction.

Alternatively, a portion of the upper pipe 48a and the lower pipe 48b or a portion of the front pipe 37a and the rear pipe 37b may be connected.
By connecting in this way, the rigidity can be increased, so that the weight can be reduced by making it possible to make it thinner.
In particular, by reducing the front-rear length of the seatback frame 3, it is possible to easily avoid the impact of a side collision on the seated occupant from coming into contact with the vehicle seat S and receiving the load.

Further, the upper pipe 48a and the lower pipe 48b are not limited to those configured separately, and the side frame provided with the U-shaped pipe 23b integrally formed in the front and rear by being connected at the lower portion as shown in FIG. Like 23, it may be connected on the rear end side.
With such a configuration, since the upper pipe 48a and the lower pipe 48b are integrally formed, the rigidity can be increased, and the number of parts can be reduced, thereby improving the efficiency of the seat manufacturing work.

In this embodiment, the upper pipe 48a, the lower pipe 48b, the front pipe 37a, and the rear pipe 37b have the same outer diameter in order to improve parts management.
However, the invention is not limited to this form of pipe, and different sizes may be used.
For example, the front pipe 37a may have an outer diameter smaller than that of the rear pipe 37b, and the ratio of the cushion pad 1a on the front side may be increased to reduce the rigidity of the vehicle seat S on the front side. In this way, when the vehicle is hit by a rear or side collision, the seated person's body can easily enter the vehicle seat S rearward, and the load on the seated person due to the rear or side collision can be alleviated. can be done.
For the same reason, the upper pipe 48a has an outer diameter smaller than that of the lower pipe 48b, and the proportion of the cushion pad 2a on the upper side is increased, thereby lowering the rigidity of the front side of the vehicle seat S. good too.

The resin frame 38 is made of a resin material such as glass-fiber-filled plastic. The front end covers the front pipe 37a and the rear end covers the rear pipe 37b. formed. In addition to the glass fiber-containing plastic, it may be formed of a plastic resin material such as CFRP, or a plastic without glass fiber or carbon fiber.
Then, as shown in FIG. 25, two headrest stays HS as rectangular tube-shaped tubular members which are vertically continuous are sandwiched between the upper portion of the front pipe 37a and the upper portion of the rear pipe 37b. Fixed. Further, a resin frame 38 is insert-molded to include the front pipe 37a, the rear pipe 37b, and at least part of the two headrest stays HS.

These two headrest stays HS are parts to which the headrest S3 is attached by receiving headrest pillars (not shown) of the headrest S3.
As described above, the headrest stay HS is attached and held with high strength by being sandwiched between the front pipe 37a and the rear pipe 37b. Then, when molding the resin frame 38, the headrest stay HS can be sandwiched between the front pipe 37a and the rear pipe 37b.

Specifically, the headrest stay HS is joined to the resin frame 38 by insert molding into the resin frame 38 together with the front pipe 37a and the rear pipe 37b. With such a configuration, separate attachment members for attaching the headrest stay HS to the front pipe 37a and the rear pipe 37b are not required, and the number of parts can be reduced. Become.

On the other hand, the headrest stay HS may be joined to the resin frame 38 by integral molding after having its lower portion welded to the front pipe 37a and its upper portion welded to the rear pipe 37b.
By welding in this manner, the mounting rigidity of the headrest stay HS included in the seatback frame 3 can be further increased.

Plate-shaped brackets 38a are formed above the resin frame 38 and below the front pipe 37a so as to connect both ends of the resin frame 38 to both sides in the seat width direction.
The plate-shaped bracket 38a constitutes a part of the resin frame 38 and is integrally molded continuously, and is molded so that a weight 38b is arranged in the center.
The bracket 38a provided with the weight 38b functions as a dynamic damper, suppressing the vibration of the seatback frame 3 and improving the ride comfort.

A hook 50 is formed inside the resin frame 38 in the seat width direction, and an S spring 36 shown in FIG. Note that the S spring 36 provided on the seat back frame 3 is omitted from FIG. 23 .

(About the installation of the S spring)
Next, attachment of the S spring 36 will be described.
As described above, the vehicle seat S is provided with the S springs 36 that impart cushioning properties to the seat back S1 and the seat cushion S2.
The S spring 36 on the seat cushion S2 side is attached to a connecting portion 76a of a pan frame 76 that constitutes the seat cushion frame 4, as shown in FIG.
Specifically, both ends of the S spring 36 are attached to hooks 76d that are continuously integrally formed with the connection portions 76a on both sides in the seat width direction.
As shown in FIG. 28, the hooks 76d are formed so as to protrude inward in the seat width direction of the connecting portions 76a on both sides and extend forward and backward. It has a hole 76b.

Since the S spring 36 can be held by the hook 76d formed integrally with the connecting portion 76a, which is a part of the pan frame 76, there is no need to provide a separate mounting member for holding the S spring 36. FIG. In addition, since it is not necessary to cut and raise the seat cushion frame 4 to hold the S spring 36, the efficiency of the mounting work of the S spring 36 can be improved.

The S spring 36 on the seat back S1 side is not shown in FIG. 23, but is attached to the seat width direction inner side of each of the lower side frame portion 22a and the resin frame 38 as partly shown in FIG. there is
Specifically, the S spring 36 below the seatback S1 is attached by a hook (not shown) that is cut and raised inward in the seat width direction in the lower side frame portion 22a.
In particular, when a hook (not shown) is provided at a position where the lower side frame portion 22a is normally covered with the resin frame 38, the lower side frame portion 22a is exposed from the resin frame 38 only at the portion where the hook is formed. It is preferable to form a resin frame 38 on the .

26, both ends of the S spring 36 above the seat back S1 are attached to hooks 50 that are continuously integrally molded from both sides of the resin frame 38 in the seat width direction and protrude inward in the seat width direction. It is
The hooks 50 as attachment portions have holding holes 50a formed in the seat width direction on both sides of the resin frame 38 in the seat width direction to hold the ends of the S springs 36. A protrusion 50b formed to protrude inward is provided.
In other words, the projecting portions 50b are formed together with the holding holes 50a so as to be cut and raised inward in the seat width direction from both sides of the resin frame 38 in the seat width direction.

Since the S spring 36 can be held by the hook 50 integrally formed with the resin frame 38 in this manner, there is no need to provide a separate mounting member for holding the S spring 36 . In addition, since it is not necessary to cut and raise the seat back frame 3 to hold the S spring 36, the efficiency of the mounting work of the S spring 36 can be improved.

<Fifteenth Modification>
A hook 51 as a mounting portion according to a fifteenth modification different from the hook 50 has, as shown in FIG.
The protruding portion 50b has a tip 51c that protrudes outward in the seat width direction from the edge facing the penetrating portion of the holding hole 51a and extends vertically.
By forming the tip 51c in this way, it is possible to prevent the S spring 36 attached to the projecting portion 51b through the holding hole 51a from falling off the hook 51 by being caught on the tip 51c.
Furthermore, since the operator who attaches the S spring 36 to the hook 50 can feel the locking of the S spring 36 to the tip 51c of the protruding portion 51b by tactile sensation, the worker can recognize the locked state and quickly perform the assembly work. becomes possible.
Note that the hook 51 having such a configuration may be applied to the hook 76 d of the seat cushion frame 4 .

Alternatively, the S spring 36 may be made of a resin spring and integrally formed with the resin frame 38 . In this way, by imparting springiness to the resin at the hooking portion of the S spring 36, the total length of the S spring 36 can be shortened.

<Sixteenth Modification>
A seat cushion frame 5 according to a sixteenth modification will be described with reference to FIG. Note that FIG. 30 is a schematic perspective view showing the seat cushion frame 5 according to the sixteenth modification.
The seat cushion frame 5 has an upper pipe 49a and a lower pipe as one and a linear frame of the metal portion having a different shape from the upper pipe 48a and the lower pipe 48b of the seat cushion frame 4 according to the example of the third embodiment. 49b.

More specifically, the upper pipe 49a is formed in a U-shape when viewed from the top by connecting the ends to the front upper portions of the connecting frames 75a and 75b, and extending forward from both ends and then reaching the height. The central portion in the seat width direction extends linearly and is formed at a substantially constant height without bending in any direction. Here, it is assumed that the pan frame 76, the upper pipe 49a and the lower pipe 49b constitute the front frame 4b corresponding to the frame member according to the present invention.
The lower pipe 49b is connected at its ends to the front lower portions of the connecting frames 75a and 75b, and is formed in a U-shape when viewed from above. After that, the central portion in the seat width direction extends linearly and is formed at a substantially constant height without being greatly bent in the height direction.

According to the seat cushion frame 5 according to the above modified example, it is easy to prevent the upper pipe 49a and the lower pipe 49b from being vertically overlapped. becomes.
On the other hand, according to the seat cushion frame 4 of the example of the third embodiment shown in FIG. The pipe 48a can be arranged, and durability can be improved.

<Seventeenth Modification>
Next, an upper pipe 55a and a lower pipe 55b according to the seventeenth modification will be described with reference to FIG. FIG. 31 is a perspective view showing an upper pipe 55a and a lower pipe 55b according to the seventeenth modification.
The main shape of the upper pipe 55a and the lower pipe 55b as the metal portion and the linear frame is the same as the upper pipe 48a and the lower pipe 48b shown in FIG. 57a and 57b are formed.

More specifically, introduction holes 56a and 56b are formed in the upper and lower pipes 55a and 55b in front of the connection frames 75a and 75b shown in FIG. Two are formed in the front and rear.
The introduction holes 56a and 56b are holes for introducing resin into the space inside the upper pipe 55a and the lower pipe 55b when the pan frame 76 is insert-molded so as to cover the upper pipe 55a and the lower pipe 55b. be.
By forming the introduction holes 56a and 56b in this way, it is possible to form the pan frame 76 and connect the pan frame 76 with the upper pipe 55a and the lower pipe 55b.

Collapses 57a and 57b are formed in front of the introduction holes 56a and 56b in the upper pipe 55a and the lower pipe 55b, respectively.
The collapses 57a and 57b are formed so as to partially close the internal spaces of the upper pipe 55a and the lower pipe 55b.
Since the crushed portions 57a and 57b are formed in this way, the resin introduced into the upper pipe 55a and the lower pipe 55b from the introduction holes 56a and 56b can be restricted to a position just before the crushed portions 57a and 57b. It becomes possible.
In other words, the crushings 57a and 57b limit the region into which the resin enters to the region closer to the introduction holes 56a and 56b than the crushings 57a and 57b, which are the regions necessary for connecting the pan frame 76 and the upper and lower pipes 55a and 55b. can do. By restricting in this way, resin is not filled in the front side (opposite side of the introduction holes 56a and 56b) of the crushed portions 57a and 57b of the upper pipe 55a and the lower pipe 55b. Therefore, the weight of the seat cushion frame 4 can be reduced.
Further, for example, when the connecting frames 75a and 75b are welded to the upper pipe 55a and the lower pipe 55b, the welding margin can be secured by forming the crushed portions 57a and 57b, and the joint strength is increased. can increase

Furthermore, the introduction holes 56a and 56b of the upper pipe 55a or the lower pipe 55b are not limited to the portion covered by the connection portion 76a of the pan frame 76, and may be formed at any position. Then, through the introduction holes 56a and 56b, the upper pipe 55a and the lower pipe 55a or the lower pipe 55a and the lower pipe 55b are arranged so as to close the hollow space on both sides of the region to be filled so that the molten resin is filled inside the upper pipe 55a and the lower pipe 55b. A configuration in which a crush is formed at 55b may be used.

As described above, the technique of filling the inside of the pipe with the resin through the introduction holes 56a and 56b and the technique of limiting the area filled with the resin by the collapses 57a and 57b are not limited to the construction of the seat cushion frame 4. , seat back frames 1 and 3.

In the above-described embodiment, the portions of the upper pipe 48a and the lower pipe 48b extending linearly from the connecting frame 75a and the connecting frame 75b on both sides in the seat width direction are formed at positions substantially overlapping each other in the seat vertical direction. explained.
Similarly, it has been described that the front pipe 37a and the rear pipe 37b on both sides in the seat width direction are formed at positions substantially overlapping each other in the seat front-rear direction.
However, the present invention is not limited to such forms.

For example, the front pipe 37a of the seat back frame 3 may be arranged outside the rear pipe 37b in the seat width direction.
This makes it easier for the body of the seated person to enter the vehicle in the event of a rear-end collision of the vehicle, and it is possible to prevent an excessive load from being applied to the body of the seated person.

Also, the lower pipes 48b, 49b of the seat cushion frame 4 may be arranged outside the upper pipes 48a, 49a in the seat width direction.
In this way, the lower pipes 48b, 49b and the upper pipes 48a, 49a are displaced in the left-right direction, so that when the pan frame 76 is insert-molded by stacking the two, the molten resin can be easily distributed, improving moldability. improves.
Similarly, when the front pipe 37a and the rear pipe 37b are shifted in the left-right direction, the formability can be similarly improved.

In the above embodiment, an example in which at least part of the seat frame is configured from one or two metal pipes has been described, but the present invention is not limited to such a configuration.
For example, for the purpose of increasing the rigidity, a plurality of metal pipes may be provided, and instead of pipes, solid materials such as wires, which are linear or rod-shaped, may be used. You may make it In particular, linear ones can be easily deformed by bending, so that the degree of freedom in the shape of the seat frame can be increased.

Furthermore, in the third embodiment, the seatback frame 3 has been described as having the front pipe 37a and the rear pipe 37b separately provided, but these pipes are connected to form a single pipe. may Specifically, the front pipe 37a and the rear pipe 37b may be connected on the lower side frame portion 22a side.
Similarly, the seat cushion frame 4 has been described as having the upper pipes 48a, 49a and the lower pipes 48b, 49b separately provided, but these pipes are connected to form a single pipe. may Specifically, the upper pipes 48a, 49a and the lower pipes 48b, 49b may be connected on the side of the connecting frame 75a.

Moreover, these metal pipes may have a plurality of introduction holes that connect the hollow inside and the outside.
According to such a configuration, when the resin frame and the pan frame are insert-molded so as to cover these pipes, the molten resin is poured into the hollow interior of these pipes through the introduction holes to integrate them. Since it becomes possible to mold, it is possible to increase the rigidity.

Further, although the vehicle seat has been described in the above embodiment, the present invention is not limited to the vehicle seat. It can be applied to a vehicle seat such as a ship, an aircraft, an industrial machine, etc., because it improves fuel efficiency by reducing weight while ensuring rigidity.

The above embodiments may also be described as the following appendices.
(Appendix 1)
A seat frame having a linear frame formed in an inverted U shape to form a skeleton of a seat, comprising a tubular member for supporting a headrest, and at least two of the linear frames being arranged in the front and rear. 2. A seat frame according to claim 1, wherein said tubular member is sandwiched and held by said linear frame in the front-rear direction.
According to the above configuration, since the tubular member is attached while being sandwiched between the linear frames, it is possible to improve the rigidity of the tubular member.

(Appendix 2)
The seat frame according to appendix 1, wherein the tubular member is welded and joined to the linear frame.
According to the above configuration, since the tubular member is welded to the linear frame, the rigidity of the tubular member can be improved.

(Appendix 3)
The seat frame according to appendix 1, wherein the cylindrical member is formed integrally with the linear frame and another member.
According to the above configuration, the tubular member is integrally formed with the linear frame and the other member, so that the number of parts can be reduced and workability can be improved.

(Appendix 4)
4. The seat frame according to any one of appendices 1 to 3, wherein the linear frame is a pipe.
According to the above configuration, since the linear frame is a pipe, it can be made lighter than a solid frame.

(Appendix 5)
The seat frame according to appendix 4, wherein the pipes have the same diameter.
According to the above configuration, by making the diameter of the pipes the same, it is possible to enhance the manageability of the parts and improve the workability.

(Appendix 6)
4. The seat frame according to claim 4, wherein the diameters of the pipes are different between the front and rear pipes, and the diameter of the pipe on the front side of the seat is smaller than the diameter of the pipe on the rear side of the seat.
According to the above configuration, since the diameter of the pipe on the front side is small, it becomes easier for the body of the seated person to enter in the event of a rear-end collision of the vehicle, and it is possible to suppress an excessive load from being applied to the body of the seated person.

(Appendix 7)
7. The seat frame according to any one of appendices 4 to 6, wherein an end portion side of the pipe is formed by being crushed.
According to the above configuration, since the end portion side of the pipe is crushed, it is easy to secure a margin for welding and workability is improved.

(Appendix 8)
The pipe according to appendix 4, wherein a hole communicating between the outside and the inside is formed in the pipe, the inside of the pipe is filled with a molten resin, and the resin material is formed to the outside through the hole. seat frame.
According to the above configuration, by filling the inside of the pipe with the molten resin and forming the resin material up to the outside of the pipe, it is possible to improve the rigidity.

(Appendix 9)
The seat frame according to appendix 1, wherein the linear frame is formed of at least two members.
According to the above configuration, workability can be improved by simplifying the shape.

(Appendix 10)
The seat frame according to appendix 1, wherein the linear frame is formed of a single member.
According to the above configuration, workability can be improved by simplifying the shape.

(Appendix 11)
The seat frame according to appendix 1, wherein a mounting member for mounting to another member is provided on an end side of the linear frame.
According to the above configuration, it is possible to improve workability and rigidity.

(Appendix 12)
The seat frame according to appendix 1, wherein another member is provided so as to fill the space of the linear frame.
According to the above configuration, the rigidity can be improved by providing another member so as to fill the space of the linear frame.

(Appendix 13)
13. The seat frame according to appendix 12, wherein the other member is provided with a mounting portion for mounting a pressure receiving member that supports an occupant.
According to the above configuration, since the mounting portion for mounting the pressure receiving member to another member is provided, it is not necessary to use a separate mounting portion, so the number of parts can be reduced, and the labor for mounting the mounting portion can be reduced. workability can be improved.

(Appendix 14)
14. The seat frame according to appendix 13, wherein the mounting portion is provided integrally with another member, and an end portion side of the mounting portion is formed larger than other portions.
According to the above configuration, since the mounting portion is provided integrally with another member, workability can be improved. It is possible to suppress the member from coming off the mounting portion.

(Appendix 15)
15. The seat frame according to appendix 14, wherein the pressure receiving member is integrally molded with the other member.
According to the above configuration, the weight can be reduced while reducing the number of parts.

(Appendix 16)
A seat frame forming a skeleton of a seat provided with a seat cushion frame, wherein the seat cushion frame is formed so as to connect a plurality of linear frames formed in a substantially U shape and the plurality of linear frames. and a plate-shaped pan frame, wherein at least one of the plurality of linear frames is bent in the vertical direction.
According to the above configuration, since at least one of the linear frames is vertically bent, the rigidity is enhanced, and it is possible to suppress the bending of the seat frame in the event of a collision.

(Appendix 17)
17. The seat frame according to appendix 16, wherein the linear frame bent in the vertical direction is a linear frame provided above the seat cushion.
According to the above configuration, since the upper linear frame is bent, it is possible to increase the rigidity and suppress the bending of the seat frame.

(Appendix 18)
17. The seat frame according to appendix 16, wherein the plurality of linear frames are provided at least at a front end and a rear end of a plate-shaped pan frame.
According to the above configuration, since the plurality of linear frames are provided at least at the front end and the rear end of the plate-shaped pan frame, the plate-shaped pan frame can be stably supported.

(Appendix 19)
17. The seat frame according to appendix 16, further comprising a mounting member for mounting the plurality of linear frames.
According to the above configuration, since the mounting member for mounting the plurality of linear frames is provided, workability of mounting the plurality of linear frames can be improved.

(Appendix 20)
17. The seat frame according to appendix 16, wherein the plate-like pan frame is made of carbon resin.
According to the above configuration, the plate-shaped pan frame is made of carbon resin, so that the weight can be reduced.

(Appendix 21)
The seat cushion frame has a height mechanism that adjusts the height of the seat, the height mechanism has a link structure composed of a plurality of links, and the plurality of links are covered with resin. The seat frame according to appendix 16, characterized in that:
According to the above configuration, since the link is covered with resin, the weight can be reduced by reducing the proportion of metal as a whole.

HS Headrest stay (cylindrical member)
M mold S vehicle seat (vehicle seat)
S1 seat back S2 seat cushion S3 headrest SF, F1 seat frame 1a, 2a, 3a cushion pad (cushion member)
1b, 2b, 3b skin material 1, 3 seat back frame (frame member)
2, 4, 5 seat cushion frame (frame member)
3c back frame member (frame member)
4a, 4b front frame (frame member)
21 upper frame 22 side frame (frame member)
22a Lower side frame (mounting bracket)
22b front pipe (metal part)
22c rear pipe (metal part)
22d resin portion 22e first extension portion 22f second extension portion 22h hollow portion 23 side frame (frame member)
23b U-shaped pipe (metal part)
24 side frame (frame member)
24b front pillar (metal part)
24c rear pillar (metal part)
26 side frame (frame member)
26d resin portion 26e space 27 side frame (frame member)
27a rib (reinforcement)
28 side frame (frame member)
28a honeycomb portion (reinforcement portion)
28b hole 28c partition 29 side frame (frame member)
29a honeycomb portion (reinforcement portion)
29b hole 29c partition wall 30 side frame (frame member)
30d resin portion 31 side frame (frame member)
31d resin portion 32 side frame (frame member)
32d resin portion 33 side frame (frame member)
33a introduction hole (hole)
34 side frame (frame member)
34c rear column 34d resin portion 35 lower frame 36 S spring (pressure receiving member)
37a front pipe (metal part, linear frame)
37b rear pipe (metal part, linear frame)
38 resin frame (resin part)
38a bracket 38b weight 39 lower member 40 side frame (frame member)
40a Beam material (metal part)
40b lower edge 40c upper edge 40d intermediate portion 41 cover (resin portion)
41a lower edge 41b connecting portion 41c upper edge 48a, 49a, 55a upper pipe (metal portion, linear frame)
48b, 49b, 55b lower pipe (metal part, linear frame)
50, 51 hook (mounting part)
50a, 51a holding hole (mounting portion)
50b, 51b Protruding portion 51c Tip 56a, 56b Introduction hole (hole)
57a, 57b Collapse 70 Side frame (frame member)
70a resin plate (reinforcement part)
70b hole 70c partition 71, 72 side frame (frame member)
71a, 72a Concavo-convex portion (reinforcing portion)
75a, 75b connecting frame 75c engaging hole 75d connecting shaft 76 pan frame (resin part, plate-shaped pan frame)
76a Connection portion 76b Holding hole (mounting portion)
76d hook

Claims (10)

A seat frame for a vehicle seat comprising a frame member,
The frame member is composed of a plurality of metal parts arranged side by side in the front-rear direction of the vehicle seat ,
The outer surface of the metal portion is covered with a resin portion made of resin,
The resin portion has a plurality of first extension portions covering the outer surfaces of the plurality of metal portions, and a second extension portion connecting the plurality of first extension portions,
The seat frame , wherein each of the plurality of first extending portions covers the metal portion along the shape of the metal portion while directly contacting the outer surface of the metal portion . The seat frame according to claim 1, wherein a hexagonal honeycomb portion is formed on the second extending portion . 3. The seat frame according to claim 2, wherein the honeycomb portion has a hexagonal hole extending through the second extending portion . 4. The seat frame according to claim 3, wherein the hexagonal holes are formed more in the lower portion than in the upper portion. The seat frame according to any one of claims 1 to 4, wherein a metal material is provided as a core material inside the resin portion. The seat frame according to any one of claims 1 to 5, wherein the resin portion holds a pressure-receiving member that supports an occupant between the plurality of metal portions arranged side by side in the front-rear direction. The seat frame according to any one of claims 1 to 6, wherein the thickness of the second extending portion is smaller than the diameter of the metal portion . The seat frame according to any one of claims 1 to 7, wherein a space is provided in the second extending portion along the longitudinal direction of the metal portion . 7. The seat frame according to claim 6, wherein the resin portion that holds the pressure receiving member has a bulging portion. 10. The resin portion is provided with a hexagonal hole portion at an intermediate portion in the longitudinal direction of the metal portion between the plurality of metal portions arranged side by side in the front and rear direction. A seat frame according to any one of the preceding claims.

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