JP6521660B2 - Seat frame and vehicle seat - Google Patents

Description

  The present invention relates to a seat frame and a vehicle seat, and more particularly to a seat frame including a metal material and a resin material, and a vehicle seat including the seat frame.

In recent years, in order to improve the fuel efficiency of a vehicle, a vehicle seat for a vehicle is formed of a resin material such as plastic, instead of a part or all of a seat back frame or a seat cushion frame made of a high strength metal material. There are some that are being reduced in weight by replacing them.
As described above, as a vehicle seat frame capable of securing strength while realizing weight reduction, it has been proposed that the seat frame be formed of a double-walled resin (see Patent Document 1).

  More specifically, Patent Document 1 describes securing a strength by forming a seat frame consisting of a seat cushion frame and a seat back frame into a double wall structure by blow molding a resin. There is.

Japanese Patent Laid-Open Publication No. 2001-23254

However, as in the seat frame described in Patent Document 1, although it can be made lightweight by being molded with resin, it is only for the resin to have a double wall structure against the impact applied to the seat frame in the event of an accident. However, it was difficult to secure sufficient rigidity.
And when it comprises a sheet | seat frame only with resin, although it can blow-mold, when it has another material, a separate joining operation | work is needed and manufacturing efficiency was low.
Therefore, the rigidity can be enhanced to suppress the deformation of the seat frame due to the impact in the event of an accident, while the manufacturing efficiency can be enhanced while suppressing the weight increase of the seat frame to improve the fuel consumption. Technology was strongly desired.

  The present invention has been made in view of the above problems, and an object thereof is to provide a seat frame and a vehicle seat capable of suppressing weight increase while securing rigidity, and having high manufacturing efficiency. It is in.

The subject is a seat frame which is a framework of a vehicle seat, and includes a first frame and a second frame made of metal extending in a predetermined direction and spaced apart in the seat width direction, and the first frame and the second frame formed on at least a portion of the part which connects the frame, have a integrally molded resin member to said first frame comprises a central member located between the first frame and the second frame, wherein The seat frame is a seat back frame, the central member is a metal upper frame, and the upper frame is integrally connected to the first frame and the second frame via the resin member. It is solved by that.

According to the above configuration, the resin member is formed on at least a part of the portion connecting the first frame and the second frame, so that it is possible to suppress the weight increase while securing the rigidity. It can join easily by integral molding with the 1st frame, and can improve manufacturing efficiency.
Further, according to the above configuration, by integrally molding the resin member with the central member, the central member can be coupled to the first frame and the second frame without welding or rivets, etc., thereby enhancing manufacturing efficiency. Since there is no thermal distortion, it becomes possible to assemble with high accuracy.
Moreover, according to the said structure, a seated person can be suitably supported by making the upper frame which requires high rigidity in supporting a seated person by metal.

The said subject is solved by providing the said seat frame, the cushion pad provided on the said seat frame, and the skin material which covers this cushion pad and is attached to the said seat frame.
According to the above configuration, by providing the above-mentioned seat frame, the first frame and the second frame are integrally formed of the resin member while the weight increase is suppressed by providing the resin member in a part of the frame. These can be joined easily and a vehicle seat with high manufacturing efficiency can be provided.

According to the seat frame of the present invention, it is possible to suppress the increase in weight while securing the rigidity, and to improve the manufacturing efficiency.
In addition, the occurrence of electrolytic corrosion makes it possible to suitably connect dissimilar materials not suitable for welding.
Further, the resin member can be firmly fixed to at least one of the integrally formed first and second frames.
In addition, the seat occupant can be suitably supported by making the upper frame metal and enhancing the rigidity.
In addition, by forming the headrest guide integrally with the upper frame, the manufacturing efficiency can be enhanced.
Further, it is possible to provide a vehicle seat with high manufacturing efficiency while suppressing an increase in weight.

1 is a schematic perspective view of a vehicle seat according to a first embodiment. It is a schematic perspective view showing a seat frame concerning a 1st embodiment. It is a schematic perspective view showing a seat back frame concerning a 1st embodiment. (A) is a schematic view showing a connection portion between an upper frame and a side frame according to one example, and (b) is a schematic view showing a connection portion between an upper frame and a side frame according to another example. is there. It is the schematic which shows the connection part of the hook and side frame which fasten S spring. It is a sectional view showing a headrest guide. It is a schematic perspective view showing a seat back frame concerning a 2nd embodiment. It is a schematic perspective view showing a seat back frame provided with a dynamic damper. It is a schematic perspective view which shows the sheet | seat lifter which concerns on 3rd Embodiment. (A) is a cross-sectional view showing the XA-XA cross section of the sheet lifter shown in FIG. 9, (b) is a cross-sectional view showing the sheet lifter having another configuration.

Hereinafter, a vehicle seat and a seat frame according to an embodiment (hereinafter, the present embodiment) of the present invention will be described with reference to the drawings.
The seat frame according to the present embodiment is a seat frame that achieves weight reduction while maintaining rigidity, and has high manufacturing efficiency. The vehicle seat includes the seat frame.

The embodiments described below are merely examples for facilitating the understanding of the present invention, and are not intended to limit the present invention. That is, the shapes, sizes, arrangements, etc. of members described below can be modified or improved without departing from the scope of the present invention, and it is a matter of course that the present invention includes the equivalents thereof.
Further, in the following description, the longitudinal direction is a direction that matches the traveling direction of the vehicle, the width direction is a direction along the width of the seat, and the vertical direction is the vertical direction of the seat It is

<< 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. Here, FIG. 1 is a schematic perspective view of a vehicle seat S according to the first embodiment, FIG. 2 is a schematic perspective view showing a seat frame SF according to the first embodiment, and FIG. 3 shows the first embodiment. The schematic perspective view which shows the seat back frame 1 which concerns, Fig.4 (a) is the schematic which shows the connection part of the upper frame 21 and the side frame 22 based on one example, FIG.4 (b) is another example. 5 is a schematic view showing a connection portion between the upper frame 21 and the side frame 22. FIG. 5 is a schematic view showing a connection portion between the hook 50 for fastening the S spring 36 and the side frame 22. It is sectional drawing which shows.

As shown in FIG. 1, the vehicle seat S according to the present embodiment is configured by 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 are disposed on a seat frame SF and covered with skin materials 1b and 2b, respectively.
The headrest S3 has a configuration in which the cushion pad 3a is disposed on a core material (not shown) and covered with the skin material 3b.

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

  The seat back frame 1 extends in the vertical direction and is fixed to upper portions of side frames 22 disposed on both sides in the sheet width direction and extending in the sheet width direction and provided on both sides. An upper frame 21 and a lower frame 35 extending in the sheet width direction and fixed to lower portions of the side frames 22 provided on both sides are provided.

Each of the side frames 22 on the left and right sides in the sheet width direction corresponds to a first frame or a second frame according to the present invention, and is formed of a metal material such as an aluminum alloy, a magnesium alloy or carbon steel. As shown in FIG. 3, the side frame 22 has a main body 22m extending vertically and a side edge 22k continuous with the front end, the lower end, and the rear end of the main body 22m and projecting inward in the sheet width direction. It is formed.
Here, the metal in the present invention means one made of a material having rigidity higher than that of a resin, and in the present embodiment, it is made of an aluminum alloy, a magnesium alloy, carbon steel or the like.

  Further, two hooks 50 described later corresponding to the resin member according to the present invention are provided at the upper and lower sides on the inner side surface of the side frame 22, and the sheet width is provided for each of the hooks 50 on both sides in the sheet width direction. Both ends of the S spring 36 mounted in the direction are attached. The S spring 36 corresponds to the central member and the support member according to the present invention.

The upper frame 21 corresponds to the resin member according to the present invention, is formed of a resin material such as carbon fiber reinforced plastic (hereinafter referred to as CFRP), and extends in the sheet width direction to form an inverted U-shaped cross section. The end portions 21 a on both sides in the sheet width direction are fixed to the upper portion of the side frame 22.
Here, as the resin according to the present invention, a resin material other than CFRP, for example, a plastic containing glass fiber, or a plastic without carbon fiber may be used.
The upper frame 21 is provided with two attachment holes 21 d for attaching a headrest guide 51 described later.

The lower frame 35 corresponds to the resin member according to the present invention, is formed of a resin material, has a long plate shape, and has left and right end portions fixed to the lower portions of the side frames 22 on both sides in the sheet width direction. It has a function to increase the overall rigidity of the frame 1.
The lower frame 35 is attached to the lower rear surface of the rear side edge 22k of the side frame 22, as shown in FIG. More specifically, the lower frame 35 is continuous at the both ends in the sheet width direction through the introduction holes 22i formed in the rear side edge 22k. The lower frame 35 is fixed to the side frame 22 in a riveted manner as described later, having an expanded portion 50b at a portion contacting the front surface through the introduction hole 22i in the rear side edge 22k.

4 and 5 are connected portions between metal materials such as the side frame 22 or the lower frame 37 described later and resin members such as the upper frame 21, the hook 50, the lower frame 35 or the resin connection portion 38 described above. It will be described in detail by reference.
As shown in FIG. 4, a plurality of introduction holes 22 i are formed in the thickness direction of the main body 22 m and the side edge 22 k in the connection portion of the side frame 22 with the upper frame 21 and the lower frame 35.

When the side frame 22 is inserted into a mold and the upper frame 21, the hooks 50 and the lower frame 35 are injection-molded, as shown in FIG. 4A, the molten resin passes through the introduction hole 22i, Depending on the shape of the mold, it is formed as an expanded portion 21b larger in diameter than the introduction hole 22i.
Thus, the upper frame 21, the hook 50 and the lower frame 35 sandwich the side frame 22 in the thickness direction thereof by forming the expanded portion 21b larger in diameter than the introduction hole 22i. It will be firmly connected.

For example, as shown in FIG. 5, the hook 50 is attached to the inside in the sheet width direction of the main body 22 m of the side frame 22 in which the introduction hole 22 j is formed. The hook 50 has an end portion 36a of the S spring 36 on the inner side in the sheet width direction, and has an expanded portion 50b connected to the outer side in the sheet width direction across the side frame 22 through the introduction hole 22j. It is formed in the shape of a rivet. Thus, the hooks 50 are rigidly attached to the side frame 22 in a riveted manner.
And, even when the S spring 36 is deformed by a load from the seated person, the hook 50 is formed of a resin material having a low hardness, so that the metal springs between the S spring 36 or the side frame 22 Generation of abnormal noise due to

It is necessary to connect the metal material and the resin material more firmly in the vicinity of the end of the side frame 22 or the like which is a metal material and to which a particularly large external force is applied.
In this case, as shown in FIG. 4B, a continuous cover portion 21c may be formed so as to pass through the introduction hole 22i and to wrap around the outside of the end portion of the side frame 22 etc. in the vicinity of the introduction hole 22i.

Also, with the above configuration, it has been described that the mounting hole 21 d is formed in the resin upper frame 21 attached to the metal side frame 22.
It is preferable that a pillar (not shown) protruding from the headrest S3 be guided and supported in the mounting hole 21d, and a resin-made headrest guide 51 shown in FIG. 6 be integrally formed.
In detail, the headrest guide 51 supports the pillars of the headrest S3 via a metal bracket 51a and a tubular connecting member (not shown).

The bracket 51a corresponds to the central member according to the present invention, and is for enhancing the rigidity at a portion in contact with the connection member (not shown), is made of metal, and is embedded along the inner surface of the headrest guide 51 There is.
Here, when the upper frame 21 is formed by injection molding, the headrest guide 51 may be integrally formed with the upper frame 21 in a state where the bracket 51 a is inserted. This can improve the manufacturing efficiency.

<< Second Embodiment >>
Although the upper frame 21 and the lower frame 35 are described as being formed only of resin in the above embodiment, the present invention is not limited to such a configuration.
A lower frame 37 and an upper frame 52 and a middle frame 34 according to another embodiment will be described with reference to FIGS. 7 and 8.
Here, FIG. 7 is a schematic perspective view showing a seatback frame 1X according to the second embodiment, and FIG. 8 is a schematic perspective view showing a seatback frame 1Y provided with a middle frame 34 functioning as a dynamic damper.
In the following description, the same components as those described in the first embodiment are denoted by the same reference numerals to prevent redundant description and clarify differences.

  The seat back frame 1X is provided with rigidity higher than that of the seat back frame 1, and includes a lower frame 37 and an upper frame 52 which are each formed of a combination of a resin portion and a metal portion.

The lower frame 37 is composed of a transverse extending plate 37a extending in the sheet width direction and a total of two resin connection portions 38 supported on both ends of the transverse extending plate 37a and joined to the side frames 22, respectively. There is.
The resin connection portion 38 corresponds to the resin member according to the present invention, is formed of a resin material, and is similar to the lower frame 35 according to the first embodiment at the rear side edge 22k of the side frame 22 by the expanded portion 21b. It is fixed in the shape of a rivet.
Furthermore, the resin connection portion 38 is an inner end portion in the sheet width direction, and a cover portion 38 c is formed on the side connected to the horizontal bridge plate 37 a. Similarly to the covering portion 21c shown in FIG. 4B, the covering portion 38c is continuously formed so as to pass through the introduction hole 37i described later and to surround the upper and lower edges of the horizontal bridge plate 37a in the vicinity of the introduction hole 37i. There is.
The transverse plate 37a corresponds to a central member according to the present invention, is made of a metal material, and in each of the two end portions in contact with the resin connection portion 38, the introduction holes 37i penetrating in the plate thickness direction are formed up and down There is. The lateral cross plate 37a is supported in a state in which both ends including the introduction hole 37i are covered by the covering portion 38c of the resin connection portion 38.

  The upper frame 52 supports the lateral support cylinder 52a extending in the seat width direction, two headrest guides 52b attached to the lateral support cylinder 52a and extending vertically, and supports both ends of the lateral support cylinder 52a to be side A total of two resin connection parts 53 joined to the frame 22 are constituted.

The resin connection portion 53 corresponds to the resin member according to the present invention, is formed of a resin material, has a U-shaped cross section, and is continuously formed in an L shape with the open side as the inner side. . Similarly to the upper frame 21 according to the first embodiment, the resin connection portion 53 is fixed in a rivet shape to the side edge 22k of the side frame 22 by the expanded portion 21b formed larger than the introduction hole 22i.
The horizontal cross cylinder 52 a is made of a metal material, and at each of the both end portions in contact with the resin connection portion 53, an introduction hole 52 c is formed in the front-rear direction. The horizontal cylinder 52a is fixed to the resin connection portion 53 in a rivet shape by an expanded portion 53b (see FIG. 4) formed larger than the introduction hole 52c.
The headrest guide 52b has a rectangular cylindrical shape, and is joined to the circumferential surface of the horizontal connection cylinder 52a in a direction perpendicular to the continuous direction of the horizontal connection cylinder 52a.
The combination of the horizontal cylinder 52a and the headrest guide 52b corresponds to the central member according to the present invention.

According to the seat back frame 1X according to the above embodiment, the lower frame 37 partially includes the metal horizontal bridge plate 37a, and the upper frame 52 partially includes the metal horizontal bridge cylinder 52a and the headrest guide 52b. By providing for, it will have high rigidity.
On the other hand, the seat back frame 1 </ b> X becomes lightweight by partially including the resin connection portion 38 and the resin connection portion 53 made of resin.

In addition, when the horizontal plate 37a and the horizontal cylinder 52a are made of metal different from that of the side frame 22 and the difference in ionization tendency is large, electrolytic corrosion will occur if these are directly joined.
In this respect, in the seat back frame 1X according to the present embodiment, the lateral bridge plate 37a and the lateral bridge cylinder 52a are connected to the side frame 22 through the resin connection portion 38 or the resin connection portion 53, such a configuration There is no problem.

The seat back frame 1 </ b> Y shown in FIG. 8 includes a middle frame 34 between the lower frame 35 and the upper frame 21.
The middle frame 34 includes a resin plate 34 a bridged to both side frames 22 and a weight 34 b joined to the center of the resin plate 34 a.
The resin plate 34a corresponds to the resin member according to the present invention, is formed of a resin material, and is fixed in a rivet shape to the rear side edge 22k of the side frame 22 by the expanded portion 21b like the lower frame 35. ing.
The weight 34b corresponds to the central member according to the present invention, is made of a metal material, is disposed at the central portion of the resin plate 34a, and is supported around the resin plate 34a.

Since the seatback frame 1Y includes the middle frame 34 and the middle frame 34 functions as a dynamic damper, it is possible to suppress the vibration of the seatback frame 1Y and to improve the ride comfort.
In particular, since the weight 34b is supported by the resin plate 34a, the middle frame 34 is easily bent, which makes it possible to further suppress the vibration of the seat back frame 1Y.
And, since the side frame 22 and the weight 34 b are connected via the resin plate 34 a and are not directly joined, it is possible to prevent electrolytic corrosion from occurring even if they are different materials, and attach them properly. It becomes possible.

<< Third Embodiment >>
Next, a sheet lifter 55 according to a third embodiment partially including a resin member will be described with reference to FIGS. 9 and 10.
Here, FIG. 9 is a schematic perspective view showing a sheet lifter 55 according to the third embodiment, and FIG. 10 (a) is a cross-sectional view showing an XA-XA cross section of the sheet lifter 55 shown in FIG. (B) is a cross-sectional view showing a sheet lifter 55 having another configuration.

  The seat lifter 55 connects the drive side link 55a, the driven side link 55b, the drive side link 55a and the driven side link 55b, and synchronizes the rotation operation with the connecting rod 55c, the connecting rod 55c and the drive side link 55a. And a resin connection portion 56 for connecting the driven side link 55b.

  The drive side link 55 a corresponds to a first frame according to the present invention, is a metal material, and is provided along the side frame 40 on one side in the seat width direction of the seat cushion frame 2. The drive side link 55a includes a gear portion 55p in part, and rotates up and down around a rotation center 55e by meshing the gear portion 55p with a pinion (not shown) which is rotated by the operation of a seated person.

  The driven link 55b corresponds to a second frame according to the present invention, is a metal material, and is provided along the side frame 40 on the other side in the seat width direction of the seat cushion frame 2. The driven side link 55b is connected to the drive side link 55a via the connecting rod 55c and the resin connection portion 56, and rotates up and down around the rotation center 56e in synchronization with the rotation of the drive side link 55a. .

The connecting rod 55c corresponds to the central member according to the present invention, is made of a metal material, is formed in a pipe shape, and is disposed to be continuous in the sheet width direction.
Both ends of the connecting rod 55c are in contact with the inner side surfaces in the sheet width direction of the drive side link 55a and the driven side link 55b. The drive side link 55a and the driven side link 55b are disposed at a position where they are held by the connecting rod 55c provided on the inner side in the sheet width direction and the fastener 55d provided on the outer side in the sheet width direction.
The fastener 55d is fitted on the inner surface of the connecting rod 55c, and the edge of one end is in contact with the drive side link 55a or the driven side link 55b at a flange-like portion formed by expanding in the radial direction.

The resin connection portion 56 corresponds to a resin member according to the present invention, is formed of a resin material, and has a function of connecting the drive side link 55a and one end of the connecting rod 55c, and connecting the driven side link 55b and the other end of the connecting rod 55c. It has, and it is provided 1 each at the both ends of the connecting rod 55c. The four resin connection portions 56 are integrally formed on the cylindrical main body 56a and the peripheral surface of the main body 56a inside the sheet width direction of the drive side link 55a or the driven side link 55b, and diverge toward the end portion side And a rib 56b having a triangular shape in a side view.
Furthermore, the resin connection portion 56 is an outer supporting portion 56c that abuts on the flange-like end of the fastener 55d and the drive side link 55a and the driven side link 55b on the outer side in the sheet width direction of the drive side link 55a or the driven side link 55b. Have.
The outer support portion 56c has an L-shaped cross section and has a circularly continuous shape, and has an opening on the extension of the hollow portion of the connecting rod 55c.

In the seat lifter 55 configured as described above, by integrally molding the resin connection portion 56 together with the drive side link 55a, the driven side link 55b, and the connecting rod 55c, assembly becomes possible easily without welding. Furthermore, unlike joining by welding, since there is no thermal distortion, it becomes possible to assemble with high accuracy.
Specifically, in a state where the main body 56a and the rib 56b joined to the connecting rod 55c by integral molding sandwich the drive side link 55a, the driven side link 55b and the fastener 55d between the outer support portion 56c Since it can join, it becomes strong and can be assembled easily.

Also, as shown in FIG. 10 (b) corresponding to the resin member according to the present invention, the sheet 56 is integrally provided with the main body 56a, the rib 56b and the outer support 56c shown in FIG. It may be formed continuously on both sides of the direction.
According to such a configuration, the resin connection portion 57 can firmly connect by continuously covering the respective component parts.

S Vehicle Seat S1 Seat Back S2 Seat Cushion S3 Head Rest SF Seat Frame 1a, 2a, 3a Cushion Pad 1b, 2b, 3b Skin Material 1,1X, 1Y Seat Back Frame 2 Seat Cushion Frame 21 Upper Frame (Resin Member)
21a end 21b extension 21c cover 21d mounting hole 22 side frame (first frame, second frame)
22i, 22j introduction hole 22k side edge 22m main body 34 middle frame
34a Resin plate (resin member)
34b Weight (central part)
35 Lower frame (plastic member)
36 S spring (center member, support member)
36a end 37 lower frame 37a horizontal plate (central member)
37i Introduction hole 38 Resin connection part (resin member)
38c Cover 40 Side frame 50 Hook (plastic member)
50a Locking hole 50b Expansion part 51 Headrest guide 51a Bracket (central member)
52 upper frame 52a horizontal cylinder (center member)
52b Headrest guide (center member)
52c Introduction hole 53 Resin connection part (resin member)
53b Expansion part 55 Seat lifter 55a Drive side link (first frame)
55b Driven link (second frame)
55c Connecting rod (central member)
55d Fastener 55e Center of rotation 55p Gear part 56 Resin connecting member (resin member)
56a main body 56b rib 56c outer side support portion 56e rotation center 57 resin connection portion (resin member)

Claims (2)

A seat frame that is a framework of a vehicle seat,
A first frame and a second frame made of metal extending in a predetermined direction and spaced in the sheet width direction;
At least a portion is formed, have a integrally molded resin member to said first frame at a portion connecting the second frame and the first frame,
A central member located between the first frame and the second frame;
The seat frame is a seat back frame,
The central member is a metal upper frame,
A seat frame characterized in that the upper frame is integrally connected to the first frame and the second frame via the resin member . A seat frame according to claim 1 ;
A cushion pad provided on the seat frame;
And a skin material attached to the seat frame so as to cover the cushion pad.

Images