JP6819939B2 - Vehicle seat back structure - Google Patents

Description

The present invention relates to a vehicle seat back structure.

The vehicle seat includes a seat cushion on which the occupant sits and a seat back that supports the occupant's upper limbs. As the seat back panel constituting the seat back, for example, as disclosed in Patent Document 1, it is known that the seat back panel is formed of a resin material in order to reduce the weight.

In addition, a headrest is attached to the upper part of the seat back panel. Therefore, the upper part of the panel needs to have a predetermined support rigidity against the load transmitted from the headrest.

Patent Document 1 discloses a bracket fixing structure of the seat back frame, which is intended to improve the support rigidity of the bracket that supports the stay of the headrest with a simple structure when the seat back frame is made of resin. The bracket is formed in a substantially rectangular tubular shape, and is arranged so that the vertical direction of the seat is the longitudinal direction.

JP 2015-003674

However, in the structure of the above example, although the material of the bracket is not mentioned, since the bracket and the seat back frame are joined by an adhesive, it takes time to solidify the adhesive. As a result, the assembly time of the seat back frame becomes long, which leads to a decrease in production efficiency.

Further, in the structure of the above example, since the bracket formed in a tubular shape is joined to the seat back frame, the joint portion around the stay has a so-called two-layer structure in which two walls overlap. Therefore, the weight of the joint is increased, and there is room for improvement in further weight reduction.

The present invention has been made to solve the above problems, and an object of the present invention is a vehicle seat back structure capable of increasing productivity while maintaining the rigidity of a resin seat back panel to which a headrest is attached. Is to provide.

In order to achieve the above object, in the vehicle seat back structure according to the present invention, a resin headrest holder for supporting the headrest is attached to the upper part of the resin seat back panel via a headrest guide. In the vehicle seat back structure, an upper opening into which the headrest guide is inserted is provided in the upper portion of the headrest holder, and a rear opening extending in the vehicle vertical direction is provided in the vehicle rear portion of the headrest holder. Is provided, and at least one protrusion protruding rearward of the vehicle is provided on each of both sides of the rear opening in the vehicle width direction, and the protrusion is inserted into the upper part of the seat back panel. A closed cross-sectional structure in which the headrest guide is arranged is formed by joining both sides of the rear opening in the vehicle width direction and the peripheral edge of the through hole. There is.

According to the vehicle seat back structure according to the present invention, it is possible to increase productivity while maintaining the rigidity of the resin seat back panel to which the headrest is attached.

It is a perspective view which shows the outline of the seat back structure for a vehicle which concerns on this invention. It is a perspective view which shows the state before the headrest guide is inserted into the front panel of the seat back panel of FIG. It is an enlarged perspective view of the part A of FIG. FIG. 2 is a perspective view of the state in which the protrusion of the headrest holder of FIG. 2 is inserted into the through hole of the headrest installation portion of the front panel as viewed from the rear of the vehicle. It is a perspective view which shows the state which the headrest holder of FIG. 4 is joined to the headrest installation part by ultrasonic caulking. It is a perspective view which shows the headrest holder of FIG. 4 alone. FIG. 6 is a perspective view of the headrest holder of FIG. 6 as viewed from the front of the vehicle. (A) is a cross-sectional view taken along the line BB of FIG. 3, and (b) shows a configuration in which a shelf is not provided in the comparative example of (a). (A) is a cross-sectional view taken along the line CC of FIG. 3, and (b) shows a configuration in which a shelf is not provided in the comparative example of (a).

Hereinafter, an embodiment of the vehicle seat back structure according to the present invention will be described with reference to the drawings (FIGS. 1 to 9).

The vehicle seat back structure according to the present embodiment is a structure in which the headrest guide 45 of the headrest 40 is attached to the front panel 10 constituting the seat back panel 1.

As shown in FIG. 1, the seat back panel 1 of the present embodiment includes a resin front panel 10 and a resin rear panel 20. The front panel 10 and the rear panel 20 are overlapped in the front-rear direction of the vehicle, and the flange portions 11 and 12 of the front panel 10 and the flange portions (not shown) of the rear panel 20 are joined.

Although not shown, the seat back panel 1 in this example has a hollow cross-sectional structure. Further, a retractor accommodating portion 2 for accommodating a seatbelt retractor (not shown) is provided on the upper part of the seat back panel.

Here, the panels 10 and 20 are formed of, for example, a carbon fiber reinforced resin material such as CFRP (carbon fiber reinforced plastics). As the matrix resin of the fiber reinforced resin material, it can be formed by using various thermoplastic resins such as PP, PA6, PA12, PA66, PEEK, PC and PET.

The rear panel 20 is made of the resin material as described above, and is a substantially rectangular plate-shaped member extending in the vehicle width direction as shown in FIG. The rear panel 20 is formed by stamping molding thermoplastic CFRP.

Subsequently, the front panel 10 will be described. Similar to the rear panel 20, a flange portion 11 is provided on the peripheral edge of the front panel 10. The front surface of the flange portion of the rear panel 20 is joined to the rear surface of the vehicle by the flange portion 11 of the front panel 10. Further, like the rear panel 20, the front panel 10 is formed by stamping molding thermoplastic CFRP.

As shown in FIG. 1, of the flange portions 11 of the front panel 10, the upper flange portions 12 arranged at the upper part are arranged on both sides of the retractor accommodating portion 2 in the vehicle width direction. The upper flange portion 12 is provided with a headrest installation portion 15 to which the headrest guide 45 is attached.

The headrest installation portion 15 of this example has a flat portion 15a. One headrest installation portion 15 has eight through holes 16 to 19 penetrating the flat portion 15a in the front-rear direction of the vehicle. In this example, four through holes 16 to 19 are set as one set, and one set of through holes 16 to 19 corresponds to the attachment of one headrest guide 45.

In this example, a set of through holes 16 to 19 has a left upper left through hole 16 and a lower left through hole 17 in FIG. 4, and a right upper right through hole 18 and a lower right through hole 19 in FIG. Each of the through holes 16 to 19 has a substantially rectangular shape extending in the vertical direction of the vehicle. The upper left through hole 16 and the lower left through hole 17 are arranged at intervals in the vertical direction of the vehicle, and the upper right through hole 18 and the lower right through hole 19 are also arranged at intervals in the vertical direction of the vehicle. Further, the upper left through hole 16 and the upper right through hole 18 are arranged at intervals in the vehicle width direction. The lower left through hole 17 and the lower right through hole 19 are also arranged at intervals in the vehicle width direction. In this example, the four through holes 16 to 19 are arranged so as to be symmetrical, but the present invention is not limited to this.

A headrest holder 30 is joined to the headrest installation portion 15. As shown in FIG. 3, the headrest holder 30 is a member for attaching the headrest guide 45. Although the details of the headrest guide 45 are omitted, it has a so-called tubular shape, extends in the vertical direction of the vehicle, and the upper end (head) projects in the radial direction from the side portion. The stay 41 at the lower part of the headrest 40 shown in FIG. 1 is attached to the headrest installation portion 15 via the headrest guide 45.

Hereinafter, the structure of the headrest holder 30 will be described. The headrest holder 30 is a member made of a resin material, like the front panel 10 and the rear panel 20. The headrest holder 30 extends in the vertical direction of the vehicle and has a substantially U-shaped cross section (flat cross section). Further, the upper portion and the lower portion of the headrest holder 30 are provided with an upper opening 33a and a lower opening 33b, respectively, and the rear portion of the vehicle is provided with a rear opening 34 extending in the vertical direction of the vehicle. (Fig. 8).

As shown in FIGS. 6 and 7, the headrest holder 30 has two left side walls 32a and right side walls 32b forming both sides of the U shape, and a front wall 32c forming the bottom of the U shape. The front wall 32c, the left side wall 32a, and the right side wall 32b are integrally formed, and each extends in the vertical direction of the vehicle. That is, the headrest holder 30 has a U-shape and penetrates up and down the vehicle, and the U-shaped opening becomes the rear opening 34.

Further, the rear portion of the headrest holder 30 is provided with four protrusions (upper left protrusion 36, lower left protrusion 37, upper right protrusion 38, lower right protrusion 39) protruding rearward of the vehicle. There is. Specifically, the upper left side protrusion 36 and the lower left side protrusion 37 are provided on the rear part of the vehicle on the left side wall 32a, and the upper right side protrusion 38 and the lower right side protrusion 39 are provided on the rear part of the vehicle on the right side wall 32b. ing.

The left upper protrusion 36 and the lower left protrusion 37 are arranged on the left side of the left opening edge 34a in FIG. 6 of the rear opening 34 at intervals in the vertical direction of the vehicle. On the other hand, the upper right protrusion 38 and the lower right protrusion 39 are arranged on the right side of the right opening edge 34a in FIG. 6 of the rear opening 34 at intervals in the vertical direction of the vehicle.

The left upper protrusion 36 and the lower left protrusion 37 are substantially rectangular parallelepipeds extending rearward of the vehicle, and the cross section perpendicular to the front-rear direction of the vehicle is a rectangular shape extending in the front-rear direction of the vehicle. The cross section of the lower left protrusion 37 is larger than that of the upper left protrusion 36. The right upper protrusion 38 and the lower right protrusion 39 are similarly formed.

The left upper protrusion 36 is inserted into the upper left through hole 16 corresponding to the upper left protrusion 36. Similarly, the lower left protrusion 37, the upper right protrusion 38, and the lower right protrusion 39 are inserted into the lower left through hole 17, the upper right through hole 18, and the lower right through hole 19 corresponding to the respective protrusions 37 to 39, respectively. Will be done. The rear opening 34 and the headrest installation portion 15 of the front panel 10 are joined in a state where the protrusions 36 to 39 are inserted into the corresponding through holes 16 to 19. Note that FIGS. 4 and 5 show a state in which one headrest holder 30 is attached to one set of through holes 16 to 19.

Specifically, the peripheral edge of the rear opening 34 is joined to the peripheral edge of each of the through holes 16-19. Further, the rear opening 34 forming the U-shaped opening is closed by the headrest installation portion 15 of the front panel 10. As a result, a closed cross-section structure is formed.

The closed cross-sectional structure is formed by a flat portion 15a of the headrest installation portion 15, a front wall 32c of the headrest holder 30, a left side wall 32a and a right side wall 32b. With the headrest holder 30 attached to the headrest installation portion 15 as shown in FIG. 5, the headrest guide 45 is inserted from the upper opening 33a as shown in FIG. In this example, the headrest guide 45 is inserted through the upper opening 33a, protrudes from the lower opening 33b, and is arranged so as to pass through the rectangular hole 13 (FIG. 3) formed below the upper flange portion 12. ing.

The front wall 32c, the left side wall 32a and the right side wall 32b of the headrest holder 30, and the flat portion 15a of the headrest installation portion 15 serve as a wall portion of a portion into which the headrest guide 45 is inserted. That is, the seat back panel 1 serves as a wall through which the headrest guide 45 is inserted.

Here, a method of attaching the headrest holder 30 to the headrest installation portion 15 will be described.

First, as shown in FIGS. 3 and 4, the upper left protrusion 36, the lower left protrusion 37, the upper right protrusion 38, and the lower right protrusion 39 are penetrated through the upper left corresponding to these protrusions 36 to 39. It is inserted through the hole 16, the lower left through hole 17, the upper right through hole 18, and the lower right through hole 19. At this time, a part of each of the protrusions 36 to 39 protrudes to the rear of the vehicle from the rear surface of the upper flange portion 12 of the front panel 10.

By ultrasonically caulking the portion of the upper flange portion 12 that protrudes rearward of the vehicle from the rear surface of the vehicle, the protruding portion is crushed forward of the vehicle as shown in FIGS. 5, 8 and 9. It transforms like this. Ultrasonic caulking is a method of fixing members of a resin material to each other by melting the resin by ultrasonic waves in a short time of about several tens of seconds, and then cooling and solidifying the resin. The portion crushed by the ultrasonic caulking forms a plate shape that expands in the vertical direction of the vehicle and the width direction of the vehicle, closes the through holes 16 to 19, and is joined to the peripheral edge of the through holes 16 to 19. As a result, the headrest holder 30 is fixed to the headrest installation portion 15.

When the members formed of the resin material are joined with an adhesive, it may take time to solidify. However, in the present embodiment, as described above, the headrest holder 30 and the front panel 10 of the seat back panel 1 However, since they are joined by ultrasonic caulking, the time required for solidification can be suppressed. As a result, the assembly time of the seat back panel 1 can be shortened.

Further, for example, in a structure in which a tubular bracket that independently forms a closed cross-sectional structure is joined to the front panel 10, the joint portion between the bracket and the front panel 10 has a two-layer structure (two-layer double wall structure). ), So the weight will increase accordingly. On the other hand, since the upper flange portion 12 of the front panel 10 and the headrest holder 30 having an open cross section having a U-shaped cross section form a closed cross section structure, the joint portion has a two-layer structure (double). It does not become a wall structure). As a result, weight reduction is possible while maintaining rigidity.

For example, when a plurality of holes are formed on the slope of the seat back panel 1, the manufacturing process of the seat back panel 1 becomes complicated. On the other hand, in the present embodiment, the through holes 16 to 19 into which the protrusions 36 to 39 are inserted are provided in the flat portion 15a of the headrest installation portion 15. Since it is a relatively easy manufacturing process to form the through holes 16 to 19 in the flat portion 15a, the structure of the present embodiment contributes to the improvement of productivity.

The rear portion of the headrest holder 30 is provided with a left rear flange portion (flange portion) 35a and a right rear flange portion (flange portion) 35b overhanging in the vehicle width direction. The left rear flange portion 35a is the rear portion of the vehicle on the left side wall 32a, and projects to the left from the left portion of the rear opening 34 in FIG. Specifically, the end (right end) of the rear opening 34 on the left rear flange portion 35a on the vehicle width direction opening center side becomes the opening edge 34a, and the opposite end (the end away from the rear opening 34). ) Projects away from the rear opening 34 with respect to the left side wall 32a.

Similarly, the right rear flange portion 35b is the rear portion of the vehicle on the right side wall 32b and projects to the right from the right portion of the rear opening 34 in FIG. Specifically, the left end of the rear opening 34 in the right rear flange 35b is the opening edge 34a, and the right end projects in a direction away from the rear opening 34 than the right wall 32b. The length of the left rear flange portion 35a and the right rear flange portion 35b in the vehicle width direction is larger than the plate thickness of the headrest holder 30. That is, it is larger than the thickness of the front wall 32c, the left side wall 32a, and the right side wall 32b.

The contact area between the headrest holder 30 and the seat back panel 1 can be increased as compared with the case where the left rear flange portion 35a and the right rear flange portion 35b are not provided. Therefore, when a load is applied to the headrest 40, the load can be distributed by the left rear flange portion 35a and the right rear flange portion 35b. As a result, it is possible to suppress damage to the headrest holder 30.

Further, as shown in FIGS. 4 and 6, the cross-sectional area of the lower left protrusion 37 is larger than the cross-sectional area of the upper left protrusion 36. Here, the cross-sectional area is the area of the cross section perpendicular to the protrusion direction (vehicle front-rear direction) of the lower left protrusion 37 and the upper left protrusion 36. In this case, the area is substantially the same as the area of the tip surface (rear surface) of each of the lower left protrusion 37 and the upper left protrusion 36. Similarly, the cross-sectional area of the lower right protrusion 39 is larger than the cross-sectional area of the upper right protrusion 38.

When a load acts on the headrest 40, a load larger than the upper part acts on the lower part of the headrest holder 30. By increasing the cross-sectional area of the lower left protrusion 37 and the lower right protrusion 39 of the headrest holder 30, damage to the headrest holder 30 and the joint portion of the ultrasonic caulking is suppressed even when a large load is applied to the headrest 40. can do.

Further, by making the upper protrusions 36 and 38 and the lower protrusions 37 and 39 different in shape, it is possible to prevent the vehicle from being erroneously assembled upside down in the vertical direction of the vehicle, which also contributes to shortening the assembly time. ..

For example, when the upper protrusions 36, 38 and the lower protrusions 37, 39 are connected to form one protrusion extending in the vehicle vertical direction, the length of the through hole to be inserted in the vehicle vertical direction is It becomes long and may cause a decrease in the strength of the upper flange portion 12. Further, in the case of a protrusion extending in the vertical direction of the vehicle, the working time of ultrasonic caulking may be long. By providing the upper protrusions 36, 38 and the lower protrusions 37, 39 as in the present embodiment, the above-mentioned problems can be prevented.

The lower portion of the headrest holder 30 of the present embodiment is thicker than the upper portion. Specifically, the front part of the vehicle at the lower part of the front wall 32c of the headrest holder 30, and the outer side at the lower part of the left side wall 32a and the right side wall 32b are formed so as to surround the front wall 32c, the left side wall 32a and the right side wall 32b. A protruding portion 32d is provided.

The vehicle front portion of the protruding portion 32d is connected to the left rear flange portion 35a and the right rear flange portion 35b so as to be continuous with each other. Further, the protruding portion 32d is integrally formed with the front wall 32c, the left side wall 32a and the right side wall 32b.

When a load acts on the headrest 40, a larger load acts on the lower part of the headrest holder 30. By providing a protruding portion 32d, which is a thick portion, at the lower part of the headrest holder 30 to increase the cross-sectional area, even when a large load is applied to the headrest 40, the joint portion of the headrest holder 30 and the ultrasonic caulking portion. Damage can be suppressed.

The lower end of the lower left protrusion 37 is arranged above the lower end of the left side wall 32a of the headrest holder 30. Similarly, the lower end of the lower right projection 39 is arranged above the vehicle with respect to the lower end of the right wall 32b. As shown in FIG. 8A, a flat shelf 35d is provided below the side walls 32a and 32b.

As shown in FIG. 8B, if the shelf 35d is not provided, when the headrest holder 30 is ultrasonically crimped to the headrest installation portion 15, the headrest is formed through the through holes 17 and 19 of the headrest installation portion 15. The burr 50 may enter the space (inside the closed cross-sectional structure) into which the guide 45 is inserted. In such a case, it becomes difficult to assemble the headrest guide 45 inside the closed cross-sectional structure of the headrest holder 30, so it is necessary to deburr. As a result, it takes time to assemble the headrest guide 45, and the assembly time of the seat back panel 1 becomes long.

On the other hand, in the present embodiment, as shown in FIG. 8A, the lower ends of the lower protrusions 37 and 39 are arranged above the lower ends of the side walls 32a and 32b, and the flat shelf 35d is arranged. By providing the shelf 35d, the shelf 35d can be brought into contact with the edges of the through holes 17 and 19 while applying pressure. As a result, it is possible to prevent burrs from entering the inside of the closed cross-section structure, so that it is not necessary to deburr. As a result, the assembly time of the seat back panel 1 can be shortened.

Further, in the present embodiment, as shown in FIG. 9A, the end portion of the upper left projection portion 36 on the opening center side of the rear opening 34 is relative to the left opening edge 34a of the rear opening 34. They are arranged at intervals in the vehicle width direction. The lower left protrusion 37 is also arranged in the same manner. Further, the ends of the upper right protrusion 38 and the lower right protrusion 39 on the rear opening 34 side are spaced apart from the right opening edge 34a of the rear opening 34 in the vehicle width direction. Have been placed. With this configuration, a flat shelf 35c is also provided between the opening edge 34a and the protrusions 36 to 39.

Similar to the lower ends of the side walls 32a and 32b, as shown in FIG. 9B, when the shelf 35c is not provided, the headrest holder 30 is ultrasonically crimped to the headrest installation portion 15, and the headrest installation portion 15 is used. The burr 50 may enter the inside of the closed cross-sectional structure from the through holes 16 to 19 of the above.

On the other hand, by providing the shelf 35c between the opening edge 34a and the protrusions 36 to 39, the same effect as the shape in which the shelf 35d is provided at the lower end can be obtained. Further, when a load acts on the headrest 40, a part of the load can be supported by the left and right shelves 35c of the rear opening 34. As a result, it is possible to suppress damage to the headrest holder 30 and the joint portion of the ultrasonic caulking, particularly when repeated twisting or load is applied to the left and right sides of the vehicle.

Further, since the seat back panel 1 is formed of CFRP, the thickness of the entire panel is reduced, including the thickness around the through holes 16 to 19 into which the protrusions 36 to 39 of the headrest holder 30 are inserted. This makes it possible to reduce the weight of the front panel 10.

For example, when CFRP is used to form a shape such that the headrest installation portion 15 of the front panel 10 has a bent portion, for example, in CFRP stamping molding, long fibers may collapse, and in CFRP injection molding. There is a possibility that the long fibers do not enter the bent part. As a result, the strength of the portion into which the headrest guide 45 is inserted due to the molding of the shape may decrease.

On the other hand, in the present embodiment, since the protrusions 36 to 39 of the headrest holder 30 are inserted into the through holes 16 to 19 of the front panel 10, the insertion portion of the headrest installation portion 15 of the front panel 10 is almost the same. It may have a smooth shape and does not need to have a complicated shape. Therefore, even when the front panel 10 of the seat back panel 1 is formed of CFRP, the isotropic properties of the long fibers are disrupted and the strength of the insertion portion of the headrest guide 45 is reduced due to the fact that the long fibers do not enter. It becomes possible to suppress this.

The description of the present embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Further, each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

In the above embodiment, the protrusions 36 to 39 are substantially rectangular parallelepipeds, but the present invention is not limited to this. For example, it may be a cylinder, or an ellipse having a cross section extending in the vertical direction of the vehicle.

1 Seat back panel 2 Retractor accommodating part 10 Front panel 11 Flange part 12 Upper flange part 15 Headrest installation part 15a Flat part 16 Upper left through hole 17 Lower left through hole 18 Upper right through hole 19 Lower right through hole 20 Rear panel 30 Headrest holder 32a Left side wall 32b Right side wall 32c Front wall 32d Protruding part 33a Upper opening 33b Lower opening 34 Rear opening 34a Opening edge 35a Left rear flange (flange part)
35b Right rear flange part (flange part)
35c Shelf 35d Shelf 36 Left upper protrusion 37 Left lower protrusion 38 Right upper protrusion 39 Right lower protrusion 40 Headrest 41 Stay 45 Headrest guide 50 Bali

Claims (7)

In a vehicle seatback structure in which a resin headrest holder for supporting the headrest is attached to the upper part of the resin seatback panel via a headrest guide.
An upper opening into which the headrest guide is inserted is provided in the upper part of the headrest holder.
A rear opening extending in the vertical direction of the vehicle is provided at the rear portion of the headrest holder, and at least one protrusion protruding rearward of the vehicle is provided on each of both sides of the rear opening in the vehicle width direction. The part is provided,
A through hole into which the protrusion is inserted is formed in the upper part of the seat back panel.
For vehicles characterized in that a closed cross-sectional structure in which the headrest guide is arranged is formed by joining both sides of the rear opening in the vehicle width direction and the peripheral edge of the through hole. Seat back structure. A flat portion extending in the vehicle width direction is provided on the upper portion of the seat back panel.
The vehicle seat back structure according to claim 1, wherein the through hole is formed in the flat portion. Flange portions are provided on both sides of the rear opening in the vehicle width direction, and the protrusions are arranged on the flange portion.
The vehicle seat back structure according to claim 1 or 2, wherein the width of the flange portion in the vehicle width direction is larger than the plate thickness of the headrest holder. The protrusion has an upper protrusion and a lower protrusion.
The upper protrusion and the lower protrusion are arranged at intervals in the vertical direction of the vehicle.
The vehicle seat back structure according to any one of claims 1 to 3, wherein the cross-sectional area of the lower protrusion is larger than the cross-sectional area of the upper protrusion. The vehicle seat back structure according to any one of claims 1 to 4, wherein the lower portion of the closed cross-sectional structure of the headrest holder is thicker than the upper portion. The vehicle seat back structure according to any one of claims 3 to 5, wherein the lower end of the protrusion is arranged above the lower end of the headrest holder. Claims 3 to 3, wherein the end portion of the protrusion closer to the rear opening is arranged at a distance in the vehicle width direction with respect to the opening edge of the rear opening. The vehicle seat back structure according to any one of 6.

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