JP2020011730A - Sheet frame, vehicle sheet, and method for manufacturing sheet frame - Google Patents

Abstract

To provide a sheet frame, a vehicle sheet, and a method for manufacturing the sheet frame in which weight is reduced and rigidity can be secured.SOLUTION: A frame member includes a side frame 22 which comprises a front pipe 22b, a rear pipe 22c, and a resin part 22d formed so as to cover an outer surface of the front pipe 22b and a rear pipe 22c, and is arranged in both sides in the sheet width direction and extends. The front pipe 22b and the rear pipe 22c are arranged side by side in the back and forth direction, and extend in the extending direction of the side frame 22. The resin part 22d comprises two first extending parts 22e which cover each outer surface of the front pipe 22b and the rear pipe 22c and extend in the extending direction of the side frame 22, and a second extending part 22f which extends in the back and forth direction to connect the two first extending parts 22e.SELECTED DRAWING: Figure 3

Description

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

2. Description of the Related Art In recent years, in order to improve fuel efficiency of a vehicle, some or all of a seat back frame and a seat cushion frame are molded from a resin material such as plastic to reduce the weight.
As a vehicle seat frame capable of securing rigidity (in the literature, described as strength) while achieving weight reduction as described above, it is proposed that the seat frame be formed of a resin having a double wall structure. (See Patent Document 1).

  More specifically, Patent Literature 1 discloses that a seat frame including a seat cushion frame and a seat back frame is formed into a double wall structure by blow molding a resin, so that the rigidity can be ensured while reducing the weight. Has been described.

  Patent Literature 2 discloses a seatback that has a light weight, high strength, and low manufacturing cost by having a skin and a round pipe integrally embedded around the entire circumference of a resin base material. I have.

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

However, as in the case of the vehicle seat frame described in Patent Literature 1, it is possible to reduce the weight by being molded with a resin. It was difficult to secure sufficient rigidity.
Further, in the vehicle seat back described in Patent Document 2, a round pipe is buried in a resin base material, but it is difficult to secure rigidity against an impact such as a side collision. Further, 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.
And, only one round pipe is buried (in a frame shape) over the entire circumference of the resin base material constituting the seat back. For this reason, when a headrest stay as a cylindrical member is attached to the round pipe, the headrest stay is attached to one side of the round pipe, so that the attachment strength may not be sufficient.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a seat frame, a vehicle seat, and a seat frame manufacturing method which are lightweight and can secure rigidity. is there.
Another object of the present invention is to increase the bonding strength between a resin part and a metal part used for a seat frame.
Another object of the present invention is to increase the mounting strength of the tubular member to the frame member.

  The object is, according to the seat frame of the present invention, a seat frame of a vehicle seat including a frame member, wherein the frame member is formed to cover a metal part and an outer surface of the metal part. And a resin portion, and has a side frame which is disposed on both sides in the sheet width direction and extends, and a plurality of the metal portions are provided side by side in a direction intersecting the direction in which the side frame extends. A plurality of first extensions extending in the direction in which the side frames extend, wherein the resin portions cover respective outer surfaces of the plurality of metal portions and extend in the direction in which the side frames extend. A solution is provided by having a portion and a second extension portion extending in a direction intersecting with the extension direction of the side frame and connecting the plurality of first extension portions.

  According to the above configuration, since the second extending portion of the resin portion is formed so as to connect the plurality of first extending portions, the area of the resin portion in the side frame is ensured while suppressing the weight. By providing a plurality of metal regions in a direction intersecting the direction in which the side frames extend, rigidity can be increased over a wide range.

Further, it is preferable that the metal part is formed to have a hollow part.
According to the above configuration, since the metal portion has the hollow portion, the weight can be reduced by the hollow portion.

Further, the metal part may be formed in a U-shaped cross section.
According to the above configuration, by forming the metal portion in a U-shaped cross section, the rigidity is increased, and the contact area with the resin is increased so that the bonding is strengthened.

Preferably, the metal portion is formed in a U-shape when viewed from the side of the sheet.
According to the above configuration, since the metal portion is formed in a U-shape, it becomes easy to position the metal portions that are arranged apart on both sides in the direction intersecting with the extending direction, and the work efficiency at the time of assembly is reduced. Increase.

In addition, it is preferable that a portion of the resin portion that covers the metal portion extends in a direction in which the metal portion extends.
According to the above configuration, since the portion of the resin portion that covers the metal portion extends in the direction in which the metal portion extends, it is possible to prevent the resin portion from peeling off from the metal portion.

Further, a space may be formed in a central portion of the resin portion in a direction intersecting the direction in which the side frames extend.
According to the above configuration, the weight can be reduced because the space is formed at the center of the resin portion in the direction intersecting the direction in which the side frames extend.

It is preferable that a reinforcing portion is provided at a central portion of the resin portion in a direction intersecting the direction in which the side frames extend.
According to the above configuration, the rigidity of the side frame can be effectively increased by providing the reinforcing portion at the central portion in the direction intersecting the extending direction in the resin portion which is a portion having low rigidity.

Further, it is preferable that the reinforcing portion has a honeycomb structure.
According to the above configuration, since the reinforcing portion has the honeycomb structure, the rigidity can be increased while maintaining the lightweight.

Further, the metal part may have a hole communicating with the inside hollow part and the outside, and the resin part may be formed from the hollow part to the outside through the hole.
According to the above configuration, a hole communicating with the hollow portion of the metal portion and the outside is formed in the metal portion, and since the resin portion is formed up to the hollow portion of the metal portion, rigidity can be increased, for example, By filling the hollow portion of the metal portion with the molten resin through the hole and performing injection molding, the resin portion can be easily formed between the hollow portion of the metal portion and the outside.

Further, the metal portion may be a linear frame that is formed in an inverted U-shape in a front view of the sheet and forms a skeleton of the frame member.
According to the above configuration, since the metal portion is a linear frame forming the skeleton of the frame member, the bending process is easy, so that the degree of freedom of the shape of the seat frame can be increased.

In addition, it is preferable that a cylindrical member for supporting the headrest is provided, and the cylindrical member is sandwiched and held by a plurality of the linear frames back and forth.
According to the above configuration, since the tubular member is sandwiched between the linear frames, the strength of holding the tubular member can be increased.

Further, the tubular member may be welded to the linear frame.
According to the above configuration, since the tubular member is welded to the linear frame, the mounting strength of the tubular member can be further increased.

Further, the cylindrical member may be integrally connected to the linear frame by the resin portion.
According to the above configuration, since the tubular member is integrally connected to the linear frame by the resin portion, the number of components can be reduced, and the workability in manufacturing can be improved.

Further, the linear frame is preferably a pipe.
According to the above configuration, the seat frame can be reduced in weight because the linear frame is formed of a hollow pipe instead of a solid pipe.

Further, the pipes are arranged in front and rear, the diameter of the pipes arranged in front and rear is different, and the diameter of the pipe located on the front side of the seat is smaller than the diameter of the pipe located on the back side of the seat. preferable.
According to the above configuration, the diameter of the pipe located on the front side of the seat is smaller than the diameter of the pipe located on the rear side of the seat, so that the ratio of the cushion pad on the front side of the seat can be increased. Therefore, the body of the occupant can easily enter the seat at the time of a rear collision, and the cushioning property can be improved.

Further, the end of the pipe may be crushed.
According to the above configuration, since the end portion of the pipe is crushed, resin can be prevented from entering the pipe, and a welding margin is secured when welding with another member at the end portion of the pipe. By doing so, the welding strength can be increased and the workability of welding can be increased.

Further, it is preferable that a mounting bracket for attaching the linear frame and the resin portion is provided on an end side of the linear frame.
According to the above configuration, since the mounting bracket is provided, the mounting strength between the linear frame and the resin portion can be increased, and the rigidity of the frame member can be increased. Since the layout of the frame can be determined, the mounting workability can be improved.

Further, it is preferable that a mounting portion for mounting a pressure receiving member for supporting an occupant is formed in the resin portion.
According to the above configuration, since the mounting portion for mounting the pressure receiving member is formed in the resin portion, it is not necessary to provide the mounting portion separately from the resin portion. Workability can be improved.

Further, the mounting portion may be provided integrally with the resin portion, a tip of the mounting portion may be formed larger than other portions, and the pressure receiving member may be engaged with the tip. Good.
According to the above configuration, since the front end of the mounting portion formed on the resin portion is formed larger than the other portion, it is possible to easily confirm by touch that the pressure receiving member has engaged with the front end of the mounting portion. The workability when assembling the pressure receiving member to the resin portion can be improved, and the pressure receiving member engaged with the mounting portion can be prevented from being accidentally detached.

Further, a pressure receiving member formed integrally with the resin portion may be provided.
According to the above configuration, since the pressure receiving member is formed integrally with the resin portion, it is not necessary to prepare a pressure receiving member separately from the resin portion, so that it is possible to reduce the number of parts, and It is possible to reduce the weight by being molded.

  According to a vehicle seat according to the present invention, the subject includes the seat frame, a cushion member provided on the seat frame, and a skin material that covers the cushion member and is attached to the seat frame. It is solved by.

  According to the above configuration, by providing the seat frame, it is possible to provide a vehicle seat that is lightweight and can secure rigidity.

  The object is, according to the seat frame manufacturing method of the present invention, to provide a frame member extending in a predetermined direction including a metal portion having a hollow portion and a resin portion bonded to at least a part of the metal portion. A method for manufacturing a seat frame for a vehicle seat, comprising: an injection step of pouring a molten resin around the metal portion; and a cooling step of pouring water or air into the hollow portion of the metal portion. This is solved by molding the resin part.

  According to the above configuration, the resin portion can be molded while shortening the cooling time of the resin, and the production efficiency of the seat frame can be increased.

Further, it is preferable that the metal part is formed integrally with the resin part by insert molding.
According to the above configuration, the frame member can be formed while the resin portion and the metal portion are joined by insert molding, so that the manufacturing operation is facilitated.
In the present invention, the term “insert” means a configuration in which a metal is disposed inside a resin, and is not limited to a configuration in which molding is performed at the same time and the configuration is applied thereto. Is also included.

ADVANTAGE OF THE INVENTION According to the seat frame which concerns on this invention, rigidity can be improved over a wide range by a metal part, holding down by a resin part at lightweight.
Further, the contact area between the metal part and the resin is increased, and the bonding strength can be increased.
Further, the positioning of the metal part is facilitated, and the working efficiency at the time of assembly is increased.
Further, it is possible to prevent the resin portion from peeling off from the metal portion.
Further, the rigidity of the frame member can be effectively increased.
In addition, a highly rigid seat frame can be easily formed.
Further, the resin portion can be easily formed between the hollow portion of the metal portion and the outside, and the rigidity can be increased.
Further, the degree of freedom of the shape of the seat frame can be increased.
Further, the strength for holding the tubular member can be increased.
Further, the weight of the seat frame can be reduced.
In addition, cushioning properties can be improved.
Further, it is possible to prevent the resin from entering the pipe, to increase the welding strength between the pipe and other members, and to enhance the workability of welding.
Further, the strength of attachment between the linear frame and the resin portion can be increased, the rigidity of the frame member can be increased, and the workability of attaching the linear frame can be improved.
Further, the workability of assembling the pressure receiving member to the resin portion can be improved, and the pressure receiving member can be prevented from being accidentally detached from the resin portion.
Further, it is possible to provide a vehicle seat that is reduced in weight while securing rigidity.
Further, the resin portion can be formed by shortening the cooling time of the resin, and the production efficiency of the seat frame can be increased.
Further, the frame member can be formed while the resin portion and the metal portion are joined by insert molding, so that the manufacturing operation is facilitated.

1 is a schematic perspective view of a vehicle seat according to an embodiment. FIG. 2 is a schematic perspective view showing a seat frame according to the embodiment. FIG. 2 is a schematic perspective view showing a side frame of the seat back frame according to the embodiment. It is a schematic perspective view which shows the side frame except the resin part. It is a schematic perspective view which shows the side frame which concerns on the 1st modification except the resin part. It is a schematic perspective view which shows the side frame which concerns on the 2nd modification from which the resin part was removed. It is a schematic perspective view which shows the side frame which concerns on a 3rd modification. It is a schematic perspective view which shows the side frame which concerns on a 4th modification. It is a schematic perspective view which shows the side frame which concerns on a 5th modification. It is a schematic perspective view which shows the side frame which concerns on a 6th modification. It is a figure which shows the BB cross section arrow view of FIG. 10A. It is a schematic perspective view which shows the side frame which concerns on a 7th modification. It is a schematic perspective view which shows the side frame which concerns on an 8th modification. It is a schematic perspective view which shows the side frame which concerns on a 9th modification. FIG. 4 is a diagram showing a cross section taken along the line XIV-XIV of the side frame shown in FIG. 3. It is a figure showing the section of the side frame concerning the 10th modification. It is a figure showing the section of the side frame concerning the 11th modification. It is a figure showing the section of the side frame concerning the 12th modification. It is a figure showing the section of the side frame concerning the 13th modification. It is a schematic perspective view which shows the side frame which concerns on the 14th modified example except the resin part. It is a schematic diagram which shows the mold clamping process at the time of 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. It is a perspective view showing the side frame of the seat cushion frame concerning a 2nd embodiment. It is a figure which shows the XXII-XXII cross section of FIG. 21 of the seat cushion frame which concerns on 2nd Embodiment. It is a typical perspective view showing the seat frame concerning a 3rd embodiment. It is a typical perspective view showing a seat back frame. FIG. 24 is a sectional view showing a XXV-XXV section of the headrest stay of FIG. 23. It is a typical front sectional view showing the hook formed in the seat back frame and holding S spring. FIG. 24 is a cross-sectional view of a hook according to a fifteenth modification, showing a portion corresponding to a cross-section XXVII-XXVII of FIG. 23. FIG. 24 is a schematic cross-sectional view showing a cross section XXVIII-XXVIII of the hook shown in FIG. 23. It is a typical perspective view showing a seat cushion frame. It is a typical perspective view showing the seat cushion frame concerning a 16th modification. It is a perspective view showing an upper pipe and a lower pipe concerning a 17th modification.

Hereinafter, a vehicle seat, a seat frame, and a seat frame manufacturing method according to an embodiment of the present invention (hereinafter, this embodiment) will be described with reference to the drawings.
The seat frame according to the present embodiment is composed of a resin part and a metal part in order to achieve weight reduction while maintaining rigidity. The 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 shapes, dimensions, arrangements, and the like of the members described below can be changed and improved without departing from the gist of the present invention, and the present invention naturally includes equivalents thereof.
Further, in the following description, the up-down direction refers to the up-down direction of the sheet. The front-back direction is a direction that matches 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 a direction along the width of the sheet.

<< 1st 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. Here, FIG. 1 is a schematic perspective view of a vehicle seat S, FIG. 2 is a schematic perspective view showing a seat frame SF, FIG. 3 is a schematic perspective view showing a side frame 22 of the seat back frame 1, and FIG. FIG. 9 is a schematic perspective view showing a side frame 22 excluding a resin part 22d.

As shown in FIG. 1, the vehicle seat S according to the present embodiment includes a seat back S1, a seat cushion S2, and a headrest S3. The seat back S1 and the seat cushion S2 have a configuration in which cushion pads 1a and 2a as cushion members are arranged on a seat frame SF and covered with skin materials 1b and 2b, respectively.
The headrest S3 has a configuration 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 FIG. 1 and FIG. 2, the seat frame SF has a seat back frame 1 forming a seat back S1 and a seat cushion frame 2 forming a seat cushion S2 as main components.

  The seat back frame 1 extends in the up-down direction and is disposed on both sides in the seat width direction (details will be described later), and the side frames 22 extend in the seat width direction and are provided on both sides. An upper frame 21 is fixed to an upper portion of the upper frame 22, and a lower frame 35 extending in the seat width direction and fixed to a lower portion of the side frames 22 provided on both sides is provided.

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

  The lower frame 35 has a long plate shape and is fixed to the lower side frame portion 22 a as a mounting bracket below the side frame 22, and has a function of increasing the overall rigidity of the seat back frame 1.

As shown in FIGS. 3 and 4, the side frame 22 includes a lower side frame portion 22a provided at a lower portion, and a metal portion fixed to the front and rear of an upper portion of the lower side frame portion 22a and extending upward. And a resin part 22d joined so as to cover the upper part of the lower side frame part 22a and the front pipe 22b and the rear pipe 22c.
In addition, the seat back frame 1, the seat cushion frame 2, or the side frame 22, or another seat back frame 3, the seat cushion frame 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, the back frame member 3c or the front frames 4a, 4b correspond to the frame member 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 formed from a metal material such as an aluminum alloy, a magnesium alloy, or carbon steel.
Here, the metal in the present invention means a material made of a substance having a higher rigidity than a resin, and in the present embodiment, is particularly made of an aluminum alloy, a magnesium alloy or carbon steel.
Each of the front pipe 22b and the rear pipe 22c corresponds to a metal part according to the present invention, and the front pipe 22b is disposed on the front side of the side frame 22, and the rear pipe 22c is disposed on the rear side of the side frame 22. It is 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 formed 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, for example, carbon fiber reinforced plastic (CFRP) or plastic without carbon fiber.

In detail, the resin portion 22d includes a first extension portion 22e extending vertically and a second extension portion 22f connecting the first extension portions 22e provided before and after the side frame 22 to the front and rear. Is provided.
The first extension portion 22e extends along the front pipe 22b and the rear pipe 22c, covering 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 except for the upper surface, respectively. I have.
The second extension portion 22f extends in the front-rear direction and connects the first extension portions 22e provided in front and rear of the side frame 22.

In this manner, the resin portion 22d is formed continuously up and down and back and forth, covering the entire upper portion of the lower side frame portion 22a and the upper surface of the front pipe 22b and the rear pipe 22c. That is, the resin part 22d is formed so as to straddle between the front pipe 22b and the rear pipe 22c and the lower side frame part 22a.
As described above, 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 and the lower side frame portion 22a can be fixed without welding. Further, the first extension portion 22e of the resin portion 22d extends along the extension direction of the front pipe 22b and the rear pipe 22c, and the contact area between them is large. It is hard to peel off from the pipe 22c.

The resin portion 22d is formed to be thicker than the front pipe 22b and the rear pipe 22c, and is attached so as to straddle the front pipe 22b and the rear pipe 22c back and forth.
In the resin portion 22d, a portion formed between the front pipe 22b and the rear pipe 22c is formed to be thicker than a portion covering the front pipe 22b or the rear pipe 22c.
Since the resin portion 22d is formed as described above, the portion of the metal material can be reduced, so that the weight can be reduced and the rigidity can be provided.

  As described above, the side frame 22 includes the lower side frame portion 22a, the front pipe 22b, and the rear pipe 22c which are formed of a metal material in one part, and has a wide range of rigidity, and has a resin part 22d in the other part. The weight reduction is realized by having.

The resin part 22d, the upper part of the lower side frame part 22a, the front pipe 22b and the rear pipe 22c are integrally formed by insert molding.
In detail, the lower side frame portion 22a, the front pipe 22b, and the rear pipe 22c are set in advance in a mold having a predetermined shape, and the molten resin is poured into the lower side frame portion 22a. 22a, the front pipe 22b and the rear pipe 22c are joined. As described above, it is possible to easily join them in a stable shape by the insert molding.

<First and second modified examples>
In the side frame 22 according to the above embodiment, the front pipe 22b and the rear pipe 22c are formed to extend upward from the front and rear of the upper part of the lower side frame part 22a. However, the present invention is not limited thereto.
Side frames 23 and 24 according to first and second modified examples of another configuration will be described with reference to FIGS.
Here, FIG. 5 is a schematic perspective view showing a side frame 23 according to a first modified example excluding the resin part 22d, and FIG. 6 is a schematic view showing a side frame 24 according to a second modified example excluding the resin part 22d. It is a perspective view.
In the following description, members having the same shape and function are denoted by the same reference numerals, and duplicate description is eliminated to 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. The U-shaped pipe 23b corresponds to a metal part according to the present invention, includes a front pipe 22b and a rear pipe 22c of the side frame 22 shown in FIG. 4, and has a shape in which respective lower ends are connected back and forth.

In the side frame 23 having such a configuration, when the U-shaped pipe 23b is fixed on the upper portion of the lower side frame portion 22a, the positioning of the U-shaped pipe 23b can be easily performed.
That is, in the side frame 22 shown in FIG. 4, when the front pipe 22b and the rear pipe 22c are fixed to the lower side frame part 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 parts before and after constituting the U-shaped pipe 23b can be defined, and the efficiency of the assembling operation is increased.

The side frame 24 according to the second modified example is not a pipe-shaped front pipe 22b and a rear pipe 22c, but has a bracket-shaped cross section (a U-shaped cross section) corresponding to one of the metal parts as shown in FIG. It has a pillar 24b and a rear pillar 24c.
In detail, the front pillars 24b and the rear pillars 24c correspond to the metal parts according to the present invention, respectively, and the open sides of the U-shape face each other, and continuously upward from the front and rear of the upper part of the lower side frame part 22a. Extending.

As described above, in the side frame 24 including the front pillar 24b and the rear pillar 24c formed in a U-shape, the rigidity is increased, the contact area with the resin portion 22d is increased, and the bonding strength is increased. .
Furthermore, since the front pillar 24b and the rear pillar 24c are plate-shaped instead of pipe-shaped, they can be integrally formed by pressing without welding to the lower side frame portion 22a. For this reason, if the side frame 24 having the front pillars 24b and the rear pillars 24c is used, the molding is facilitated, and the assembling work can be performed with high efficiency.
In addition, the front pillar 24b and the rear pillar 24c as metal parts need only have a large contact area with the resin part 22d, and are not limited to a U-shaped cross section, but may have a C-shaped or B-shaped cross section. Is also good.

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

For example, in the side frame 26 according to the third modification, as shown in FIG. 7, the resin portion 26d is characterized in that a space 26e is partially formed.
In detail, the resin portion 26d of the side frame 26 is formed so as to cover the front pipe 22b, the rear pipe 22c, and the upper portion of the lower side frame portion 22a. Same as the part 22d.
The resin portion 26d is different from the resin portion 22d in the upper and lower central portions of the resin portion 26d, and in a portion between the front pipe 22b and the rear pipe 22c, a space 26e formed to penetrate in the sheet width direction. Is formed.

  By forming the space 26e in the side frame 26 in this manner, the seat frame SF can be reduced in weight, and the electronic device can be disposed between the outside of the seat and the inside of the seat in the seat width direction. Can be passed through.

<Fourth modification>
In the side frame 26 according to the third modification, since the space 26e is formed, the weight can be reduced, but the rigidity may be lower than the design condition.
For this reason, as shown in FIG. 8, the rib 27a may be formed so as to straddle the space 26e.

A side frame 27 according to a fourth modification including the rib 27a will be described with reference to FIG. Here, FIG. 8 is a schematic perspective view showing the side frame 27.
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 in the space 26e.

If the rib 27a is integrally formed with the front pipe 22b, the rear pipe 22c, and the lower side frame part 22a together with the resin part 26d, the rib 27a can be efficiently assembled.
On the other hand, the frame body fitted into the rib 27a and the space 26e is inserted as a unit 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 to be retrofitted. You may make it.
The rib 27a may be formed of only a resin to reduce the weight, but a metal material may be provided 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 rib 26a for reinforcement is provided in the space 26e of the resin portion 26d, 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 modification will be described with reference to FIG. Here, FIG. 9 is a schematic perspective view showing the side frame 28.
The honeycomb portion 28a corresponds to a reinforcing portion according to the present invention, and includes a regular hexagonal hole portion 28b penetrating in the sheet width direction, and a partition wall portion 28c formed so as to define the hole portion 28b.
The honeycomb portion 28a can reduce the weight because no material is required for the volume of the hole portion 28b, and its structure can maintain high rigidity against a load in the seat width direction.

If the honeycomb part 28a is integrally formed with the front pipe 22b, the rear pipe 22c, and the lower side frame part 22a together with the resin part 26d, the honeycomb part 28a can be efficiently assembled.
On the other hand, as a unit, the frame fitted to the honeycomb portion 28a 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. It may be retrofitted.

  Further, the honeycomb portion 28a may be composed of a plurality of layers, and the positions of the hole portion 28b and the partition wall portion 28c may be shifted to be combined in a layered manner in the sheet width direction. By doing so, the rigidity can be further increased.

  Further, the honeycomb portion 28a may be formed only of a resin for weight reduction, but a metal material may be disposed as a core material inside. By doing so, the rigidity can be further increased.

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

The honeycomb portion 29a corresponds to a reinforcing portion according to the present invention, and includes a regular hexagonal hole portion 29b penetrating in a vertical direction, and a partition wall portion 29c formed so as to define the hole portion 29b.
The honeycomb portion 29a can reduce the weight because no material is required for the volume of the hole portion 29b, and the structure can maintain high rigidity against a vertical load.

The frame that fits into 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 to be retrofitted. Be attached.
Further, the honeycomb portion 29a may be composed of a plurality of layers, and the positions of the hole portion 29b and the partition wall portion 29c may be shifted so as to be vertically combined. By doing so, the rigidity can be further increased.

  Further, the honeycomb portion 28a may be formed only of a resin for weight reduction, but a metal material may be disposed as a core material inside. By doing so, the rigidity can be further increased.

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

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 a partition wall portion 70c formed so as to separate them.
In this case, high rigidity can be secured by attaching the resin plate 70a to the space 26e of the resin portion 26d or by integrally molding the resin plate 70d with the resin portion 26d.
Further, the hole is not limited to the regular hexagonal holes 28b and 29b and the circular hole 70b, and may have a triangular, quadrangular or other shape.

<Eighth and ninth modifications>
Furthermore, side frames 71 and 72 including a Miura-folded (registered trademark) -shaped portion which is a configuration that can be reduced in weight while securing high rigidity without forming the holes 28b, 29b, and 70b are shown in FIGS. 13 will be described.
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 having a predetermined shape.
The side frame 72 has an uneven portion 72a as a reinforcing portion formed by combining a plurality of parallelograms having a predetermined shape.
Since the side frame 71 or the side frame 72 has the uneven portions 71a and 72a, the rigidity can be increased, and the thickness can be reduced and the weight can be reduced.

<Tenth to thirteenth modifications>
Next, as a configuration example different from the side frame 22, a side frame 30 according to a tenth modification having a resin portion 30d joined to a front pipe 22b and a rear pipe 22c, and an eleventh modification having no front pipe 22b The side frame 31 according to the twelfth modified example without the rear pipe 22c, and the side frame 34 according to the thirteenth modified example with the front pillar 24b and no rear pillar 24c are shown in FIGS. This will be described with reference to FIG.
Here, FIG. 14 is a diagram showing a cross section taken along the line XIV-XIV of the side frame 22 shown in FIG. 3, FIG. 15 is a diagram showing a cross section of the side frame 30, FIG. 17 is a diagram showing a cross section of the side frame 32, and FIG. 18 is a diagram showing a cross section of the side frame.

As shown in FIG. 14, the resin portion 22d of the side frame 22 according to the embodiment is formed continuously in the front-rear direction, covering the peripheral surfaces of the front pipe 22b and the rear pipe 22c. As described above, since the resin portion 22d covers the peripheral surfaces of the front pipe 22b and the rear pipe 22c, it is firmly attached to these.
On the other hand, as long as the resin portion 22d has high strength and the mounting strength with the front pipe 22b and the rear pipe 22c can be sufficiently secured, the configuration is not limited to such a configuration, and as shown in FIG. Alternatively, a part of the opposing peripheral surfaces of the front pipe 22b and the rear pipe 22c may be joined to each other by the resin portion 22d.
In this way, the material can be reduced because the entire circumference of the front pipe 22b and the rear pipe 22c is not covered.

Further, as shown in FIGS. 16 and 17, without providing the front pipe 22b or the rear pipe 22c, the resin portions 31d and 32d extend to the position where the front pipe 22b or the rear pipe 22c is provided. A configuration may be adopted.
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 amount of 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.

Further, as in a side frame 34 shown in FIG. 18, a resin part 34d extending rearward may be integrally formed with a front pillar 24b having a U-shaped cross section extending vertically only from the front side. .
In particular, the rear pillar 34c is formed so as to have the same outer shape as the one side having the front pillar 24b even on the rear side where the metal front pillar 24b is not provided, so that the rigidity is enhanced.

  Note that, in the above-described embodiment, the resin parts 22d, 26d, and 30d that can be formed by a mold are integrated with the front pipe 22b, the rear pipe 22c or the front pillar 24b, and the lower side frame part 22a. , 31d, 32d, and 34d, the joining and molding can be performed at the same time, so that the working efficiency is improved.

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. May be formed.
By doing so, the number of parts can be reduced, and the assembling work can be facilitated.

<14th modification>
In the above description, the presence or absence of a hole in the peripheral surface of the front pipe 22b, the rear pipe 22c, and the U-shaped pipe 23b was not mentioned. However, as illustrated in FIG. The introduction hole 33a to be introduced may be provided 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 parts 22d, 26d, 30d, 31d, and 32d.

The U-shaped pipe 23b constituting the side frame 33 is formed with five upper and lower introduction holes 33a so as to be connected to the hollow portion 22h from the front and rear side surfaces, respectively.
With the introduction hole 33a formed in this manner, when the resin parts 22d and 26d are injection-molded, the resin parts 22d and 26d spread to the hollow part 22h of the U-shaped pipe 23b through the introduction hole 33a. The joining strength can be increased.
The target for forming the introduction hole 33a is not limited to the U-shaped pipe 23b, but may be formed in the front pipe 22b and the rear pipe 22c.

Note 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 that is the base of the resin parts 22d, 26d, 30d, 31d, and 32d is placed in the mold. After pouring, the cooling rate of the resin parts 22d and 26d may be increased by passing water or air through the hollow part 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 illustrating a mold clamping process when injection molding the side frame 22, FIG. 20B is a schematic diagram illustrating the injection process, and FIG. 20C is a schematic diagram illustrating the cooling process.
First, as shown in FIG. 20A, a front pipe 22b, a rear pipe 22c, and a 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, the 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, the molten resin is cooled by flowing water or air into the hollow portions 22h of the front pipe 22b and the rear pipe 22c to form the resin portions 22d, 26d, 30d, 31d, and 32d. To do it.
According to such a process, it is possible to increase the production efficiency of the side frame 22 and the like.

<< 2nd Embodiment >>
In the above-described embodiment, an example has been described in which the rigidity is maintained while the weight of the seat back S1 is reduced by the resin portions 22d, 26d, 30d, 31d, and 32d, but the present invention is applied to only the seat back S1. Not limited.
For example, the side frames 40 constituting the seat cushion frame 2 may be employed in a similar configuration, with the direction being changed from the up-down direction to the front-back direction.

Further, an example in which a resin cover 41 is joined to the side surface of the side frame 40 of the seat cushion frame 2 will be described next with reference to FIGS.
Here, FIG. 21 is a perspective view showing a side frame 40 of the seat cushion frame 2 according to the second embodiment, and FIG. 22 is a cross-sectional view taken along the line XXII-XXII of FIG. 21 of the seat cushion frame 2 according to the second embodiment. FIG.

  The side frame 40 includes a beam member 40a including a lower edge 40b, an upper edge 40c, and an intermediate portion 40d therebetween, and a cover 41 formed of a resin material and covering an outer side of the beam member 40a in the sheet width direction. It is composed of

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

The cover 41 corresponds to the resin portion according to the present invention, and has a connecting portion 41b extending outward in the sheet width direction formed on at least a part of the outer side surface of the intermediate portion 40d in the beam member 40a. , A lower edge 41a and an upper edge 41c are formed vertically.
According to the above-described configuration, the appearance can be improved by the cover 41, and by forming the cover 41 from a resin, the weight can be reduced as compared with the case where the cover 41 is formed from a metal material.
Then, a resin portion similar to the resin portion 22d is provided so as to cover at least a part of the beam member 40a, and the cover 41 is formed integrally with the resin portion, whereby manufacturing efficiency can be improved.

<<< 3rd Embodiment >>>
A seat frame F1 according to a third embodiment as another embodiment of the present invention will be described with reference to FIGS.
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 seat back frame 3, and FIG. FIG. 26 is a schematic front cross-sectional view showing a hook 50 formed on the seat back frame 3 and holding the S spring 36, taken along a line XXV-XXV of the headrest stay HS. FIG. 27 is a cross-sectional view of a hook 51 according to a fifteenth modified example, showing a portion corresponding to a cross section XXVII-XXVII of FIG. 23. FIG. 28 is a cross-sectional view of XXVIII-XXVIII of a hook 76d shown in FIG. FIG. 29 is a schematic perspective view showing the seat cushion frame 4.

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

(About seat cushion frame)
As shown in FIGS. 23 and 29, the seat cushion frame 4 is formed in a substantially rectangular shape in plan view, and the left and right connection frames 75a and 75b connected to the seat back frame 3 and the left and right connection frames. And a front frame 4a formed over the frames 75a and 75b.

The connection frames 75a and 75b are made of metal, have high rigidity, and form side frames of the seat cushion frame 4.
Step portions are formed in the connection frames 75a and 75b so as to protrude rearward of the seat. The step portion functions as a weak portion that is deformed when an impact is applied to the vehicle, and functions to reduce the load applied to the occupant.
The weak portion may be constituted by a connecting shaft 75d extending in the sheet width direction and having both ends joined to the connecting frame 75a and the connecting frame 75b, instead of the step portion.
Specifically, by joining both ends of the connection shaft 75d and the connection frames 75a and 75b, the rigidity of the joint is necessarily increased.
On the other hand, the rigidity around the joint is relatively low.
For this reason, the peripheral portion of the connection frame 75a, 75b at the joint with the connection shaft 75d can function as a weak portion.

Further, at the front end side of each of the connecting frames 75a and 75b, two engaging holes 75c are formed in front and rear portions of the pan frame 76 to be connected to a connecting portion 76a of the pan frame 76, which will be described later. Have been.
When the pan frame 76 described later is integrally molded, the molten resin of the pan frame 76 enters the engagement hole 75c, so that the contact area between the connection portion 76a and the connection frames 75a and 75b increases, and the connection strength is increased. Becomes
The front frame 4a includes an upper pipe 48a and a lower pipe 48b as a skeleton, and a pan frame 76 having these inside and being insert-molded.
Note that 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, corresponds to one of the resin portions according to the present invention and a plate-shaped pan frame, and is a member that constitutes a front portion of the seat cushion frame 4. The connecting portions 76a at the rear ends on both sides in the width direction are connected to the connecting frames 75a and 75b.
An S spring 36 as a pressure receiving member is provided in the seat width direction at connection portions 76a on both sides of the connection frames 75a and 75b and the pan frame 76 in the sheet width direction. The mounting structure of the S spring 36 will be described later.

The end of the upper pipe 48a is connected to each of the front upper portions of the connection frames 75a and 75b, and is formed in a U-shape in a top view (U-shape). In detail, the upper pipe 48a extends forward from both ends and bends inward in the sheet width direction, then bends downward, and further bends inward in the sheet width direction to form a central portion in the sheet width direction. It is formed so as to extend linearly.
A portion of the upper pipe 48a formed in this manner is bent inward in the seat width direction at the upper portion of the seat cushion frame 4 and extends, thereby increasing rigidity. For this reason, the displacement amount of the seat cushion frame 4 can be reduced.

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

  As described above, the upper pipe 48a is formed to be shorter than the lower pipe 48b, and the upper pipe 48a is located lower than the lower pipe 48b at the center in the seat width direction. It is configured to easily avoid the occurrence of the submarine phenomenon at the time.

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

The link of the seat lifter (not shown) and the connection bracket (not shown) are rotatably mounted by a resin bush (not shown) formed integrally with the link and a rotary shaft inserted through the bush.
In particular, the portion of the bush that comes into contact with the seating surface of the head of the rotating shaft is formed thicker than the other portions so that the rotation center does not shift, and the rigidity is low. Has been enhanced.

The rear ends of the upper pipe 48a and the lower pipe 48b on both sides in the sheet width direction are welded to the upper and lower sides of the connection frames 75a, 75b on both sides in the sheet width direction on the inner side in the sheet width direction.
In addition, the portions extending linearly from the connection frame 75a and the connection frame 75b on both sides in the sheet width direction of the upper pipe 48a and the lower pipe 48b are formed at positions substantially overlapping in the seat vertical direction.
And it is preferable that the rear end side of the upper pipe 48a and the lower pipe 48b is formed so as to be crushed in the radial direction. If the upper pipe 48a and the lower pipe 48b are formed as described above, a welding margin is formed between the connection pipes 75a and 75b, and the joining strength can be increased.

In the above description, only the pan frame 76 of the seat cushion frame 4 is formed of a resin material. However, other components may be formed of a resin material.
For example, a gear of a seat lifter (not shown) and a link connected to the gear may be constituted by a metal part and a resin part in which the metal part is inserted. In this case, the weight can be reduced by using the resin portion instead of a part of the metal portion.

(About seat back frame)
The seat back frame 3 has a resin frame 38 as a U-shaped resin portion with the open side as the lower side, and is formed integrally with the resin frame 38 to function as a frame. It mainly comprises a front pipe 37a and a rear pipe 37b made of metal corresponding to one of the following.
Further, the seat back frame 3 is provided at a lower end on both sides in the seat width direction of the resin frame 38 and is joined to the front pipe 37a and the rear pipe 37b, and the lower side frame parts 22 on both sides in the seat width direction. And a lower member 39 spanned over 22a.

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

  The lower member 39 is composed of a plate-shaped metal member and a resin member insert-molded with the metal member inside, and a rib (not shown) for increasing rigidity is formed on the resin member on the surface. It is preferable that it is done.

The front pipe 37a and the rear pipe 37b as linear frames are formed in a U-shape (reverse U-shape) with the lower side being the open side in a front view, and the seat width of the front pipe 37a and the rear pipe 37b. The portions on both sides in the direction are formed at positions substantially overlapping in the front-back direction of the seat.
The upper part of the front pipe 37a extends in the seat width direction. As shown in FIGS. 23 to 25, the upper part and the lower part of the headrest stay HS described later can be fixed in the sheet width direction in the rear pipe 37b. And is formed at a position lower than the upper portion extending to the upper side.

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

Also, a part of the upper pipe 48a and the lower pipe 48b or a part of the front pipe 37a and the rear pipe 37b may be connected.
By connecting in this manner, rigidity can be increased, so that it is possible to make the device thinner, so that the weight can be reduced.
In particular, by reducing the length of the front and back of the seat back frame 3, it is easy to prevent the occupant from coming into contact with the vehicle seat S and receiving a load due to an impact at the time of a side collision.

In addition, the upper pipe 48a and the lower pipe 48b are not limited to those formed separately, and a side frame including a U-shaped pipe 23b connected at a lower portion and integrally formed in front and rear as shown in FIG. As in 23, they 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, the number of parts can be reduced, and the sheet manufacturing operation can be made more efficient.

In the present embodiment, the outer diameters of 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 the manageability of parts.
However, the present invention is not limited to such a form of pipe, and a pipe of a different size may be used.
For example, the front pipe 37a may have an outer diameter smaller than the outer diameter of the rear pipe 37b, and the rigidity of the vehicle seat S on the front side may be reduced by increasing the ratio of the cushion pad 1a on the front side. By doing so, when the vehicle is hit in the rear or side collision, the body of the seated person can easily enter the rear of the vehicle seat S, and the load on the seated person due to the rear collision or the side collision can be reduced. Can be.
For the same reason, the upper pipe 48a has an outer diameter smaller than the outer diameter of the lower pipe 48b, and the ratio of the cushion pad 2a is increased on the upper side to reduce the rigidity of the front side of the vehicle seat S. Is also good.

The resin frame 38 is formed of a resin material such as plastic containing glass fiber, and has a front end covering the front pipe 37a and a rear end covering the rear pipe 37b. Is formed. In addition, other than plastic containing glass fiber, it may be formed of a plastic resin material such as CFRP, plastic without glass fiber or carbon fiber.
Then, as shown in FIG. 25, two headrest stays HS as rectangular tubular members that are vertically continuous are sandwiched between the upper part of the front pipe 37a and the upper part of the rear pipe 37b. Fixed. Further, a resin frame 38 is insert-molded including a front pipe 37a, a rear pipe 37b, and at least a part of the two headrest stays HS therein.

The two headrest stays HS are parts for attaching the headrest S3 by receiving a headrest pillar (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. 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 being insert-molded into the resin frame 38 together with the front pipe 37a and the rear pipe 37b. With such a configuration, the number of components can be reduced without requiring a separate mounting member for mounting the headrest stay HS to the front pipe 37a and the rear pipe 37b, and a welding process is not required, which facilitates manufacturing. Become.

On the other hand, the headrest stay HS may be integrally joined to the resin frame 38 after the lower part is welded to the front pipe 37a and the upper part is welded to the rear pipe 37b.
By performing the welding in this manner, the mounting rigidity of the headrest stay HS included in the seat back frame 3 can be further increased.

A plate-shaped bracket 38a is formed above the resin frame 38 and below the front pipe 37a so as to connect both ends to both sides of the resin frame 38 in the sheet width direction.
The plate-like bracket 38a constitutes a part of the resin frame 38 and is continuously and integrally molded, and is molded so that the weight 38b is provided at the center.
The bracket 38a provided with the weight 38b functions as a dynamic damper, so that vibration of the seat back frame 3 can be suppressed and riding comfort can be improved.

  A hook 50 is formed on the inner side of the resin frame 38 in the sheet width direction, and an S spring 36 described later shown in FIG. The S spring 36 provided on the seat back frame 3 is not shown in FIG.

(About mounting S spring)
Next, attachment of the S spring 36 will be described.
As described above, the vehicle seat S is provided with the S spring 36 that provides cushioning to the seat back S1 and the seat cushion S2.
As shown in FIG. 23, the S spring 36 on the seat cushion S2 side is attached to a connecting portion 76a of a pan frame 76 constituting the seat cushion frame 4.
More specifically, both ends of the S spring 36 are attached to hooks 76d that are continuously formed integrally with the connection portions 76a on both sides in the sheet width direction.
As shown in FIG. 28, the hooks 76d are formed so as to protrude inward in the sheet width direction of the connecting portions 76a on both sides and extend forward and rearward, and are formed in the front-rear direction to hold an end of the S spring 36. It has a hole 76b.

  As described above, since the S spring 36 can be held by the hook 76d integrally formed 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. Further, since it is not necessary to perform processing such as cutting and raising the seat cushion frame 4 in order to hold the S spring 36, the efficiency of attaching the S spring 36 can be increased.

Although the S spring 36 on the seat back S1 side is omitted in FIG. 23, as shown partially in FIG. 27, the S spring 36 is attached to the inside of each of the lower side frame portion 22a and the resin frame 38 in the seat width direction. I have.
Specifically, the S spring 36 below the seat back S1 is attached by a hook (not shown) formed by being 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 by 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 bottom.

As shown in FIG. 26, both ends of the S spring 36 above the seat back S1 are attached to hooks 50 which are continuously formed integrally from both sides of the resin frame 38 in the sheet width direction and project inward in the sheet width direction. Have been.
The hook 50 as an attachment portion has a holding hole 50a formed in the sheet width direction on both sides of the resin frame 38 in the sheet width direction to hold an end of the S spring 36, and the holding hole 50a has a sheet front direction and a sheet width. The protrusion 50b is formed so as to protrude inward in the direction.
In other words, the protruding portions 50b are formed together with the holding holes 50a as cut and raised from both sides in the sheet width direction of the resin frame 38 to the inside in the sheet width direction.

  As described above, since the S spring 36 can be held by the hook 50 integrally formed with the resin frame 38, there is no need to provide a separate mounting member for holding the S spring 36. Further, since it is not necessary to perform processing such as cutting and raising the seat back frame 3 in order to hold the S spring 36, the efficiency of the mounting operation of the S spring 36 can be increased.

<15th modification>
As shown in FIG. 27, a hook 51 as a mounting portion according to a fifteenth modified example different from the hook 50 has a protruding portion 51b whose tip 51c is formed larger than other portions.
At the edge of the protruding portion 50b facing the penetrating portion of the holding hole 51a, a tip 51c, which is a projection protruding outward in the sheet width direction from other portions, is formed to extend in the vertical direction.
By forming the distal end 51c in this manner, the S spring 36 assembled to the protruding portion 51b through the holding hole 51a can be prevented from falling off from the hook 51 by being hooked on the distal end 51c.
Further, since the worker attaching the S spring 36 to the hook 50 can feel the engagement of the S spring 36 with the tip 51c of the protruding portion 51b by tactile sensation, the worker can recognize the locked state and quickly perform the assembling work. Becomes possible.
Note that the hook 51 having such a configuration may be applied to the hook 76d of the seat cushion frame 4.

  Further, the S spring 36 may be formed as a resin spring and formed integrally with the resin frame 38. In this way, by giving the resin at the portion where the S spring 36 is hooked to have a spring property, the overall length of the S spring 36 can be shortened.

<16th modification>
A seat cushion frame 5 according to a sixteenth modification will be described with reference to FIG. FIG. 30 is a schematic perspective view showing the seat cushion frame 5 according to the sixteenth modification.
The seat cushion frame 5 has a shape different from the upper pipe 48a and the lower pipe 48b of the seat cushion frame 4 according to the example of the third embodiment, and the upper pipe 49a and the lower pipe as one and linear frames of the metal part. 49b.

In detail, the upper pipe 49a is formed in a U-shape in a top view with an end connected to each of the front upper portions of the connection frames 75a and 75b. The central portion in the sheet width direction extends linearly without substantially bending in the direction, and is formed at a substantially constant height. Here, it is assumed that the pan frame 76, the upper pipe 49a, and the lower pipe 49b constitute a front frame 4b corresponding to a frame member according to the present invention.
The lower pipe 49b has an end connected to each of the front lower portions of the connection frames 75a, 75b and is formed in a U-shape in a top view, and extends forward from both ends with a shorter length than the upper pipe 49a. After that, the central portion in the sheet width direction extends linearly without substantially bending in the height direction and is formed at a substantially constant height.

According to the seat cushion frame 5 according to the above-described modification, the upper pipe 49a and the lower pipe 49b can be easily prevented from overlapping one another up and down, and can be insert-molded into the pan frame 76 after being combined into a predetermined shape. Becomes
On the other hand, according to the seat cushion frame 4 according to the example of the third embodiment shown in FIG. 29, the load from the occupant is likely to be applied, and the rigidity is required along the edge of the rear portion of the pan frame 76. The pipe 48a can be provided, and the durability can be improved.

<Seventeenth modification>
Next, an upper pipe 55a and a lower pipe 55b according to a 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 a seventeenth modification.
The main shapes of the upper pipe 55a and the lower pipe 55b as one of the metal parts and the linear frame are the same as those of the upper pipe 48a and the lower pipe 48b shown in FIG. 29, and different points are the introduction holes 56a, 56b, The point is that 57a and 57b are formed.

More specifically, in the upper pipe 55a and the lower pipe 55b, on the front side of the connection frames 75a and 75b shown in FIG. 23, and at the portions covered by the connection portions 76a of the pan frame 76, introduction holes 56a and 56b are respectively provided. Two are formed before and after.
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. is there.
By forming the introduction holes 56a and 56b in this manner, it is possible to form the pan frame 76 and connect the pan frame 76 to the upper pipe 55a and the lower pipe 55b.

In the upper pipe 55a and the lower pipe 55b, collapses 57a and 57b are formed in front of the introduction holes 56a and 56b, respectively.
The collapses 57a and 57b are formed so as to close a part of the internal space of the upper pipe 55a and the lower pipe 55b.
As described above, the formation of the collapses 57a and 57b makes it possible to restrict the resin introduced into the inside of the upper pipe 55a and the lower pipe 55b from the introduction holes 56a and 56b to just before the collapses 57a and 57b. It becomes possible.
In other words, the area into which the resin enters is limited by the crushing 57a, 57b to an area closer to the introduction holes 56a, 56b than the crushing 57a, 57b, which is an area necessary for connecting the pan frame 76 to the upper pipe 55a and the lower pipe 55b. can do. By restricting in this way, the resin is not filled on the front side (the opposite side of the introduction holes 56a, 56b) of the upper pipe 55a and the lower pipe 55b before the collapses 57a, 57b. Therefore, the weight of the seat cushion frame 4 can be reduced.
Further, for example, when the connection frames 75a and 75b are welded to the upper pipe 55a and the lower pipe 55b, the crushing 57a and 57b are formed, so that a welding margin can be secured, and the joining strength can be secured. Can be increased.

  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 connecting portion 76a of the pan frame 76, and may be formed at any position. The upper and lower pipes 55a and 55b are closed on both sides of the filling area so that the molten resin is filled into the upper pipe 55a and the lower pipe 55b through the introduction holes 56a and 56b. A configuration in which a crush is formed in 55b may be employed.

  As described above, the technique of filling the inside of the pipe with the introduction holes 56a and 56b and the technique of restricting the filling area of the resin with the collapses 57a and 57b are not limited to those constituting the seat cushion frame 4. , Can be applied to the seat back frames 1 and 3.

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

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 at the time of a rear collision of the vehicle, so that an excessive load is applied to the body of the seated person.

Further, 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.
By doing so, the lower pipes 48b, 49b and the upper pipes 48a, 49a are shifted in the left-right direction, so that when the two are overlapped and the pan frame 76 is insert-molded, the molten resin spreads easily, and the moldability is improved. 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-described embodiment, an example has been described in which at least a part of the seat frame is formed from one or two metal pipes, but the present invention is not limited to such a configuration.
For example, a plurality of metal pipes may be provided for the purpose of further increasing rigidity.Furthermore, instead of pipes, solid materials such as wires and linear or rod-shaped materials are used. You may make it. In particular, since a linear object can be easily deformed by bending, the degree of freedom of the shape of the seat frame can be increased.

Further, in the third embodiment, the front pipe 37a and the rear pipe 37b are described as being separately provided in the seat back frame 3, but they are composed of one pipe in which these are connected. You may. Specifically, the front pipe 37a and the rear pipe 37b may be connected on the lower side frame portion 22a side.
Similarly, in the seat cushion frame 4, the upper pipes 48a and 49a and the lower pipes 48b and 49b have been described as being separately provided. However, the upper pipes 48a and 49a are composed of one pipe connected to each other. You may. Specifically, the upper pipes 48a, 49a and the lower pipes 48b, 49b may be connected on the connection frame 75a side.

Further, these metal pipes may have a plurality of introduction holes connecting the hollow inside and outside.
According to such a configuration, when insert molding a resin frame or a pan frame so as to cover these pipes, the molten resin is poured into the hollow interiors of these pipes so as to pass through these introduction holes. Since molding can be performed, rigidity can be increased.

  Further, in the above embodiment, the vehicle seat has been described, but the present invention is not limited to the vehicle seat. In order to improve fuel efficiency by reducing the weight while securing rigidity, the present invention can be applied to vehicle seats for ships, aircraft, industrial machines, and the like.

About the said embodiment, it can also be described like the following additional remarks.
(Appendix 1)
A seat frame that has a linear frame formed in an inverted U shape and forms a skeleton of a seat, including a tubular member that supports a headrest, wherein at least two linear frames are disposed in front and rear. The seat frame is characterized in that the tubular member is sandwiched and held by the linear frame back and forth.
According to the above configuration, the rigidity of the tubular member can be improved because the tubular member is sandwiched and attached to the linear frame.

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

(Appendix 3)
The seat frame according to claim 1, wherein the tubular member is formed integrally with the linear frame and another member.
According to the above configuration, since the tubular member is formed integrally with the linear frame and the other members, the number of components can be reduced, and workability can be improved.

(Appendix 4)
The seat frame according to any one of supplementary notes 1 to 3, wherein the linear frame is a pipe.
According to the above configuration, since the linear frame is a pipe, the weight can be reduced as compared with a solid one.

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

(Appendix 6)
The seat frame according to claim 4, wherein the diameter of the pipe differs 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, the body of the occupant easily enters at the time of a rear collision of the vehicle, and it is possible to suppress an excessive load from being applied to the body of the occupant.

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

(Appendix 8)
The pipe according to claim 4, wherein a hole communicating the outside and the inside is formed in the pipe, and the inside of the pipe is filled with a molten resin, and a resin material is formed to the outside through the hole. Seat frame.
According to the above configuration, the rigidity can be improved by filling the inside of the pipe with the molten resin and forming the resin material to the outside of the pipe.

(Appendix 9)
2. The seat frame according to claim 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)
2. The seat frame according to claim 1, wherein the linear frame is formed of one member.
According to the above configuration, workability can be improved by simplifying the shape.

(Appendix 11)
The seat frame according to claim 1, wherein an attachment member for attaching 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 claim 1, wherein another member is provided so as to fill a 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 claim 12, wherein the other member is provided with a mounting portion for mounting a pressure receiving member for supporting an occupant.
According to the above configuration, since the attachment portion for attaching the pressure receiving member to another member is provided, the number of components can be reduced because there is no need to use a separate attachment portion, and the labor for attaching the attachment portion is reduced. Workability can be improved.

(Appendix 14)
The seat frame according to claim 13, wherein the attachment portion is provided integrally with another member, and an end portion of the attachment portion is formed larger than other portions.
According to the above configuration, the workability can be improved because the attachment portion is provided integrally with the other member, and the pressure receiving pressure is increased because the end portion of the attachment portion is formed larger than the other portion. It is possible to prevent the member from coming off the mounting portion.

(Appendix 15)
15. The seat frame according to claim 14, wherein the pressure receiving member is formed integrally with the other member.
According to the above configuration, it is possible to reduce the weight while reducing the number of parts.

(Appendix 16)
A seat frame forming a skeleton of a seat including a seat cushion frame, wherein the seat cushion frame is formed so as to connect the 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 a vertical direction.
According to the above configuration, since at least one of the linear frames is bent up and down, rigidity is enhanced, and bending of the seat frame at the time of a collision can be suppressed.

(Appendix 17)
17. The seat frame according to claim 16, wherein the linear frame bent in the vertical direction is a linear frame provided above a seat cushion.
According to the above configuration, since the upper linear frame is formed to be bent, rigidity can be increased, and bending of the seat frame can be suppressed.

(Appendix 18)
17. The seat frame according to claim 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)
The seat frame according to claim 16, wherein an attachment member for attaching the plurality of linear frames is provided.
According to the above configuration, since the attachment member for attaching the plurality of linear frames is provided, the workability of attaching the plurality of linear frames can be improved.

(Appendix 20)
17. The seat frame according to claim 16, wherein the plate-like pan frame is formed 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 for adjusting the height of the seat, and the height mechanism has a link structure including a plurality of links, and the plurality of links are covered with resin. 17. The seat frame according to supplementary note 16, wherein:
According to the above configuration, the weight of the link can be reduced by reducing the proportion of metal as a whole as much as the link is covered with the resin.

HS headrest stay (tubular 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 part 26e Space 27 Side frame (frame member)
27a rib (reinforcing part)
28 Side frame (frame member)
28a Honeycomb part (reinforcement part)
28b Hole 28c Partition 29 Side frame (frame member)
29a Honeycomb part (reinforcement part)
29b Hole 29c Partition 30 Side frame (frame member)
30d resin part 31 side frame (frame member)
31d resin part 32 side frame (frame member)
32d resin part 33 side frame (frame member)
33a Inlet hole (hole)
34 Side frame (frame member)
34c Rear pillar 34d Resin 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 Middle part 41 Cover (resin part)
41a Lower edge 41b Connecting portion 41c Upper edge 48a, 49a, 55a Upper pipe (metal part, linear frame)
48b, 49b, 55b Lower pipe (metal part, linear frame)
50, 51 hook (mounting part)
50a, 51a Holding hole (mounting part)
50b, 51b Projecting portion 51c Tip 56a, 56b Introducing hole (hole)
57a, 57b crushed 70 Side frame (frame member)
70a resin plate (reinforcement part)
70b Hole 70c Partition 71,72 Side frame (frame member)
71a, 72a Uneven part (reinforcing part)
75a, 75b Connection frame 75c Engagement hole 75d Connection shaft 76 Pan frame (resin portion, plate-shaped pan frame)
76a Connection part 76b Holding hole (mounting part)
76d hook

Claims (23)

A vehicle seat frame including a frame member,
The frame member includes a metal portion and a resin portion formed so as to cover an outer surface of the metal portion, and has a side frame that extends and is disposed on both sides in the seat width direction.
A plurality of the metal parts are provided side by side in a direction intersecting the direction in which the side frames extend, and extend in the direction in which the side frames extend,
The resin part is
A plurality of first extending portions that cover the respective outer surfaces of the plurality of metal parts and extend in the extending direction of the side frame;
A second extending portion extending in a direction intersecting with the extending direction of the side frame and connecting the plurality of first extending portions.   The seat frame according to claim 1, wherein the metal part is formed to have a hollow part.   The seat frame according to claim 1, wherein the metal portion is formed in a U-shaped cross section.   The seat frame according to any one of claims 1 to 3, wherein the metal portion is formed in a U-shape when viewed from a side of the seat.   5. The seat frame according to claim 1, wherein a portion of the resin portion that covers the metal portion extends in a direction in which the metal portion extends. 6.   The seat frame according to any one of claims 1 to 5, wherein a space is formed in a central portion of the resin portion in a direction intersecting with a direction in which the side frame extends.   The seat frame according to any one of claims 1 to 6, wherein a reinforcing portion is provided at a central portion of the resin portion in a direction intersecting with an extending direction of the side frame.   The seat frame according to claim 7, wherein the reinforcing portion has a honeycomb structure. In the metal part, a hole communicating with the inside hollow part and the outside is formed,
The seat frame according to claim 2, wherein the resin portion is formed from the hollow portion to the outside through the hole.   2. The seat frame according to claim 1, wherein the metal portion is a linear frame that is formed in an inverted U shape in a front view of the seat, and forms a skeleton of the frame member. 3. A cylindrical member that supports the headrest,
The seat frame according to claim 10, wherein the tubular member is sandwiched and held back and forth by the plurality of linear frames.   The seat frame according to claim 11, wherein the tubular member is welded to the linear frame.   The seat frame according to claim 11, wherein the cylindrical member is integrally connected to the linear frame by the resin portion.   The seat frame according to any one of claims 10 to 13, wherein the linear frame is a pipe. The pipes are arranged back and forth,
The diameter of the pipes arranged before and after is different,
The seat frame according to claim 14, wherein the diameter of the pipe located on the front side of the seat is smaller than the diameter of the pipe located on the rear side of the seat.   The seat frame according to claim 14, wherein an end side of the pipe is crushed.   The seat frame according to any one of claims 10 to 16, wherein a mounting bracket for mounting the linear frame and the resin portion is provided on an end side of the linear frame.   The seat frame according to any one of claims 1 to 17, wherein an attachment portion for attaching a pressure-receiving member that supports an occupant is formed in the resin portion. The mounting portion is provided integrally with the resin portion,
The tip of the mounting portion is formed larger than other portions,
19. The seat frame according to claim 18, wherein the pressure receiving member is engaged with the front end.   The seat frame according to any one of claims 1 to 17, further comprising a pressure receiving member formed integrally with the resin portion. A seat frame according to any one of claims 1 to 20,
A cushion member provided on the seat frame,
A cover material that covers the cushion member and is attached to the seat frame. A metal frame having a hollow portion, and a resin portion bonded to at least a part of the metal portion, a method for manufacturing a seat frame of a vehicle seat including a frame member extending in a predetermined direction,
An injection step of pouring the molten resin around the metal part,
A cooling step of pouring water or air into the hollow part of the metal part,
A method for manufacturing a seat frame, comprising molding the resin portion by injection molding comprising:   The method according to claim 22, wherein the metal part is formed integrally with the resin part by insert molding.

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