JP5339790B2 - Panel type vehicle seat back frame structure and vehicle seat back having the structure - Google Patents

Description

The present invention relates to a frame structure of a panel type vehicle seat back and a vehicle seat back having the structure, and more specifically, achieves weight reduction while securing the strength of the vehicle seat back in the vehicle seat. The present invention relates to a frame structure of a panel type vehicle seat back and a vehicle seat back having the structure.

Conventionally, a vehicle seat has a seat cushion having a lower portion fixed to a passenger compartment floor portion, and a seat back having a lower portion supported by a rear portion of the seat cushion. A type that cannot be moved forward in an upright state has been adopted.

Such a vehicle seat back includes a seat back frame that forms a frame structure of the vehicle seat back, and a pad that covers the seat back frame, an outer trim, and the like are provided on the seat back frame.
The seat back frame structure is roughly classified into a type in which the whole is configured in a frame shape and a flat panel type.

If the example of the former type is demonstrated, as shown in FIG. 5, the seat back for vehicles will be made into 2 division structure, and the structure where each combined the pipe goods and the press goods is employ | adopted. FIG. 5 shows one of the divided frame frames. For example, in a frame frame of a seat back for a rear seat, which is a backrest part of a rear seat of an automobile, as shown in FIG. 5, two points on the lower side and one point on the upper door side are supported in total. From the viewpoint of securing torsional rigidity, a pipe member A having a closed cross section is used as a strength member, as shown in FIG. 6, and the pipe frame A is bent by bending the pipe member A. In order to fix the vehicle seat back to the vehicle body through the pipe material A, the bracket material B is fixed to the pipe material A by welding as a press material so that it can be arranged along the periphery, and at each of the three support positions. Yes.

On the other hand, the latter type will be explained. In the case of the panel type, unlike the former panel frame which does not function as a strength member as a simple decorative plate, the panel itself has the function of the strength member. In this sense, as described above, it is not necessary to separately provide a pipe member or the like as a strength member, so that the structure can be simplified.
However, such panel types have the following technical problems.

First, conventionally, such a panel type employs a single panel having the same thickness, which has been an impediment to reducing the weight of the vehicle seat back.
More specifically, in such a panel type, particularly in the case of a three-point supported vehicle seat back as described above, it is necessary to determine the panel thickness from the viewpoint of ensuring rigidity or strength.

In this case, since the headrest of a heavy object is usually fixed to the upper part of the seat back in the vehicle seat back, the torsional rigidity in the longitudinal direction of the vehicle becomes a problem. In particular, in the case of a wagon type vehicle, it is important to ensure such torsional rigidity because the headrest is fixed at a position shifted from the center in the left-right direction of the vehicle seatback due to structural requirements. .
In this respect, it is possible to ensure torsional rigidity by increasing the panel thickness, but from the viewpoint of ensuring panel manufacturing efficiency, the sheet thickness is set to the safe side in terms of strength. Was adopted.

Secondly, conventionally, in such a panel type, a mounting and fixing bracket is separately provided and fixed to the panel in order to mount and fix the vehicle seat back to the vehicle.
More specifically, a bracket having a flat plate portion separately pressed at each of the left and right ends of the lower part of the panel is welded to the outer surface of the panel, and a bracket as a member for fixing to a vehicle and a panel as a strength member. Has been an obstacle to further weight reduction.
In recent years, improvement in fuel efficiency has attracted attention from the viewpoint of preventing global warming, and for that reason, reduction in weight of automobiles has been promoted along with improvement in engine performance.
From the viewpoint of such weight reduction, the structure employs overlapping members, leaving room for further weight reduction.

In this regard, a seat back frame structure that achieves weight reduction by adopting a so-called tailored blank material in a type that is entirely configured in a frame shape is known (Patent Document 1). This frame structure is a structure in which an upper frame and a lower frame that are bridged at the upper and lower ends are provided to a plate-like side frame that is arranged so that the plate width is positioned in the front-rear direction in a pair of left and right. A so-called tailored blank material is used for each side frame. Here, the tailored blank material is a known press material that can be prepared by combining a plurality of steel plates according to the purpose by welding.

However, this type changes the plate thickness in the height direction of the side frame by adopting a so-called tailored blank material from the viewpoint of securing bending rigidity with respect to the side frame. It does not change. Further, the idea of using the side frame as the strength member as the member for fixing to the vehicle is not presented.
JP 2006-51272 A

In view of the above technical problems, an object of the present invention is to provide a vehicle seat back frame structure that achieves weight reduction while ensuring the necessary strength or rigidity of a panel type vehicle seat back, and a vehicle having the structure. It is to provide a seat back.

In order to solve the above problems, a frame structure of a vehicle seat back according to the present invention includes:
A frame structure of a panel type vehicle seat back,
It has a flat panel frame with a substantially rectangular shape,
This panel frame has a thick portion over the entire height direction on each of the left and right sides, while a thin portion is provided between both thick portions,
A fixing surface for a vehicle seat back is formed at the lower end of each thick portion.
It is configured.

According to the frame structure of the panel-type vehicle seat back having such a configuration, in the flat panel frame functioning as a strength member, the plate thickness is uniformly thick on the safety side over the entire flat plate. For example, only the right and left ends that are effective for securing the torsional rigidity acting in the longitudinal direction of the vehicle are thickened over the entire height direction, so that the rigidity required for strength is achieved. By setting the plate thickness corresponding to the position required to secure the vehicle, weight reduction can be achieved while ensuring the required strength or required rigidity of the vehicle seat back.

In addition, in each thick part over the entire height direction of both left and right end parts, by utilizing the flat part of the lower end part as a surface for mounting and fixing the vehicle seat back to the vehicle, on the surface of the thick part, It is possible to prevent the weight from being increased without having to separately provide a mounting and fixing bracket. In particular, from the viewpoint of ensuring the torsional rigidity in the front-rear direction of the vehicle seat back, it is important to thicken the left and right sides of the flat panel frame over the entire height direction. It is possible to utilize the lower end of the thick wall portion as a mounting and fixing surface to the vehicle without separately attaching a mounting and fixing bracket to the vehicle.

Further, the panel frame may be made of a tailored blank material formed by abutting and welding side end portions of a plurality of plate members in the vertical direction of the vehicle seat back.
Further, the panel frame has three side plates of the same material corresponding to the thick part on the left and right sides of the panel frame and the thin part between the thick parts. It is good to consist of the tailored blank material formed by abutting and welding.

Furthermore, the panel frame abuts the side edges of the three plate members in the vertical direction of the vehicle seat back, corresponding to the thick part on both sides of the panel frame and the thin part between the thick parts. The plate material corresponding to both thick portions and the plate material corresponding to the thin portions may be made of different materials.
Furthermore, each of the three plate members has a rectangular shape having a length of one side corresponding to the height of the panel frame, and the panel frame is configured by welding side edges of one side of the three plate members. Good.

In addition, in each thick part, the thickness and / or width of the thick part may be determined according to the position in the width direction of the panel frame of the headrest fixed to the upper part of the panel frame.
Furthermore, the vehicle is a sedan type automobile, the headrest is fixed at the center position in the width direction of the panel frame,
The thick portions on the left and right sides may have the same thickness and width.
On the other hand, the vehicle is a wagon type automobile, and the headrest is fixed at a position deviated from the center position in the width direction of the panel frame,
In the thick parts on both the left and right sides, the thickness and width of the thick part far from the installation position of the headrest may be set larger than the thickness and width of the thick part near the installation position of the headrest. .
Furthermore, the vehicle seat back has a two-part structure. In each of the divided vehicle seat backs, the panel frame has a total of three points, one of the lower left and right ends and the upper left and right ends of the four corners. It is good to be supported with respect to the vehicle.
In addition, it is preferable that a bead for securing strength that forms a predetermined pattern by protruding forward is provided on the front surface of the panel frame.

In order to solve the above-mentioned problems, a vehicle seat according to the present invention includes a vehicle seat back having the frame structure according to any one of claims 1 to 9, and a lower portion fixed to a vehicle compartment floor. It is set as the structure which has a seat cushion.

According to the vehicle seat having such a configuration, in the frame structure employed in the vehicle seat back, in the flat panel frame functioning as a strength member, the plate thickness is set on the safety side in terms of strength over the entire flat plate. Without achieving a uniform thick wall, for example, by increasing the wall thickness over the entire height direction only at the left and right ends effective to ensure the torsional rigidity acting in the longitudinal direction of the vehicle, By setting the plate thickness corresponding to the position necessary to ensure the rigidity necessary for strength, weight reduction can be achieved while ensuring the necessary strength or necessary rigidity of the vehicle seat back.
In addition, in each thick part over the entire height direction of both left and right end parts, by utilizing the flat part of the lower end part as a surface for mounting and fixing the vehicle seat back to the vehicle, on the surface of the thick part, It is possible to prevent the weight from being increased without having to separately provide a mounting and fixing bracket.

According to the frame structure of the panel type vehicle seat back and the vehicle seat back having the structure according to the present invention, in the flat panel frame functioning as a strength member, the plate thickness is increased over the entire flat plate. The required strength or required rigidity of the vehicle seat back is set by setting the plate thickness corresponding to the position required to secure the rigidity required for strength without having to be uniform on the safe side. It is possible to achieve weight reduction while ensuring the above.

The embodiment of the vehicle seat according to the present invention will be described in detail below with reference to the drawings, taking as an example the case where the vehicle seat is applied to a rear seat of a wagon type automobile.
FIG. 1 is a front view of a panel frame structure of a vehicle seat back according to an embodiment of the present invention. FIG. 2 is a side view of the panel frame structure of the vehicle seat back according to the embodiment of the present invention. FIG. 3 is a front view illustrating a situation in which the vehicle seat back panel according to the embodiment of the present invention is configured by a tailored blank material. FIG. 4 is a partial perspective view showing a situation in which the vehicle seat back according to the embodiment of the present invention is fixed to the vehicle.

As shown in FIGS. 1 and 2, a rear seat 10 for a vehicle according to the present invention includes a seat cushion 14 having a lower portion fixed to a passenger compartment floor portion 12 and a seat back 16 having a lower portion supported by a rear portion of the seat cushion 14. The seat back 16 can be moved forward as will be described later.
The vehicle seat includes a pad (not shown) attached to the front side of the panel frame 18 so as to entirely cover the front surface of the panel frame 18 described later, and a bag-like shape that covers the panel frame 18 and the pad as a whole. An epidermis (not shown) is provided.

As shown in FIG. 1, the rear seat back is divided into left and right parts, each having a seat back frame having a panel frame 18, and in each of the divided vehicle seat backs, the panel frame 18 has a lower part of the four corners. The divided portion supported by the vehicle at a total of three points, either the left and right ends of the upper part or the left and right ends of the upper part, has the same structure, so one of them (the right divided portion in FIG. 1) will be described. .

The panel frame 18A has a substantially rectangular steel plate shape, and a convex portion (bead) 20A protruding frontward is partially formed in a desired pattern on the front surface thereof. Secured. Further, a bracket 22 for fixing the grommet holder is attached to the upper part of the front surface of the panel frame 18A at a position slightly shifted to the left side from the center in the width direction (left and right direction in FIG. 1). A bracket 26 for fixing the lock unit is attached immediately below the bracket 24. The bracket 26 is arranged in the width direction (FIG. 1) in the same manner as the bracket 22 for structural reasons of the wagon type. In the left-right direction). Further, a bracket 28 for fixing an armrest is attached to the lower part of the front surface of the panel frame 18A at a position closer to the left side than the center in the width direction (left and right direction in FIG. 1), and a small opening 30 is provided on the right side thereof. It has been.

The panel frame 18A has rectangular thick portions 32A and B (for example, a plate thickness of 1.2 mm) extending in the entire height direction on both the left and right sides, and between the thick portions 32A and 32B. Is provided with a rectangular thin portion 34 (for example, a plate thickness of 0.7 mm) extending in the entire height direction, and fixed surfaces 36A, B of the vehicle seat back are provided at the lower ends of the thick portions 32A, B, respectively. Is formed. In each of the thick portions 32A and B, the thickness (t1, t2) and / or width (and / or width) of the thick portions 32A and B according to the position in the width direction of the panel frame 18A of the headrest fixed to the upper portion of the panel frame 18A. w1, w2) are determined. In the case of a wagon type automobile, the headrest is fixed at a position deviated from the center position in the width direction of the panel frame 18A, and in the thick portions 32A and B on both sides of the left and right sides, the thickness of the thick portion far from the headrest installation position. The thickness and width are set to be larger than the thickness and width of the thick portion closer to the headrest installation position.

  As shown in FIG. 3, the panel frame 18A is made of a tailored blank material. Here, the tailored blank material is a known press material that can be prepared by combining a plurality of steel plates according to the purpose by welding. In particular, the panel frame has three side plates 37 made of the same material corresponding to the thick portions 32A, B on the left and right sides of the panel frame and the thin portions 34 between the thick portions 32A, B, respectively. Is made of a tailored blank formed by abutting and welding in the vertical direction of the vehicle seat back. Each of the three plate materials has a rectangular shape having a length of one side corresponding to the height of the panel frame 18A, and the panel frame 18A is configured by welding side edges 37 on one side of the three plate materials.

As a modified example, the panel frame 18A has side edges of three plate members corresponding to the thick portions 32A and B on both sides of the panel frame 18A and the thin portions 34 between the thick portions 32A and B, respectively. It consists of tailored blank material formed by abutting the portion 37 in the vertical direction of the vehicle seat back and welding, and the plate material corresponding to both the thick portions 32A and B and the plate material corresponding to the thin portion 34 are: It may be made of different materials.
As described above, by forming the panel frame 18A using the tailored blank material, the plate thickness (t1, t2, t3) of each plate material to be abutted and welded corresponding to the torsional moment acting on the panel frame 18A. It is possible to realize an optimal arrangement of the plate thickness in terms of ensuring the necessary strength while reducing the overall weight. Since it is possible to ensure the required rigidity or strength by such a simplified structure, it is possible to avoid the complexity of the structure or the increase in the number of parts, thereby enabling the dimensional accuracy and production of each part. It is also possible to improve the performance.

The effect | action is demonstrated below about the vehicle rear seat 10 which has the above structure. In the following description, the left half panel frame 18B is described, but the same applies to the right half panel frame 18A.
As shown in FIG. 4, the panel frame 18B is fixed to the vehicle body structure at a substantially central position in the width direction of the lower left corner, the lower right corner, and the upper part, and is fixed at three points. More specifically, the fixing surface 36B is bolted 56 to the bracket portion 54 of the center hinge portion 52 provided on the body floor 50, and similarly, the fixing surface 36A is provided to the side hinge portion 60 provided to the wheel house 58. The panel frame 18B is configured such that the rear back theta can be moved forward about the axis line connecting the center hinge portion 52 and the side hinge portion 60.

Thus, the vehicle rear seat 10 is provided with a pair of left and right hinges that pivotably support the vehicle rear seat 10 back and forth, and each hinge has a lower side portion of the panel frame 18B with respect to the vehicle body. A bracket that is pivotally supported and protrudes from the body floor, and a pivot shaft that pivotally supports the panel frame 18B on the bracket. The vehicle rear seat 10 in an upright position is centered on the pivot shaft of each hinge. The reciprocating rotation is possible toward the front.
Also, the bracket 67 is fixed to the vehicle body when the rear back seat is made upright by turning on and off the lock of the striker 70 provided on the vehicle body and the lock component 66 by bolting 68 to the lock component 66. I have to. Each of the rear back seats divided into two can be moved forward independently of each other.

When such a vehicle rear seat 10 is in an upright state, when a load is applied to the vehicle rear seat 10, for example, when a load placed in the luggage compartment is added to the vehicle rear seat 10 from behind, The panel frame 18 functions as a strength member, and it is possible to prevent the panel frame 18 from being deformed such as a depression. Further, when it is necessary to ensure the necessary torsional rigidity of the panel frame 18B, it is possible to cope with it by increasing the thickness of the thick portions 32A and 32B.
On the other hand, in the thick wall portions 32A and 32B provided on the left and right sides of the panel frame 18B, by utilizing the flat portion at the lower end as a surface for fixing the frame, both functions of securing strength and fixing the frame are achieved. As a result, it is possible to avoid duplication of the plate material due to the separately provided bracket material as a fixing component, and to achieve weight reduction while ensuring the necessary strength of the vehicle seat back 16 it can. In particular, from the viewpoint of ensuring the torsional rigidity in the front-rear direction of the vehicle seat back, it is important to thicken the left and right sides of the flat panel frame over the entire height direction. It is possible to utilize the lower ends of the thick portions 32A, B as a surface for mounting and fixing to the vehicle without separately attaching a mounting and fixing bracket to the vehicle.

As a modification, in addition to the left and right side portions of the panel frame 18, a thicker portion may be further provided at the center portion of the panel frame 18 with a tailored blank material.
More specifically, as defined by the automobile regulations ECE, in the seat back for the rear seat, in order to increase the load resistance when the rear seat receives due to the load movement in the rear luggage compartment, 2. Description of the Related Art A seat back for a rear seat is known that is provided with a reinforcing frame that passes through substantially the center and is fixed to a frame frame by welding at both ends. By providing such a reinforcing frame, the reinforcing frame is formed so that the intermediate portion of the reinforcing frame passes through the external force receiving portion of the panel frame 18, and both ends are connected to the high-strength frame frame. Therefore, it is possible to suppress the middle portion of the reinforcing frame from absorbing the external force due to the movement of the load and to generate a depression in the panel frame 18, and it is possible to improve the strength against a large load acting on the external force receiving portion.

In this modification, without providing such a reinforcing frame separately, a thick portion with a set thickness is provided by the tailored blank material according to the assumed load, thereby acting on the external force receiving portion. The strength against the load can be improved. In particular, since such a thick portion is provided in the central portion of the panel, that is, in the thin portion, the thick portion is formed in a rectangular shape smaller than the size of the thin portion, and a punched portion corresponding to this rectangular shape is formed in the thin portion. By providing the tailored blank material, the four side edges of the thick part can be welded and fixed to the thin part, and the thick part can be firmly fixed to the thin part.

Although the embodiments of the present invention have been described in detail above, various modifications or changes can be made by those skilled in the art without departing from the scope of the present invention. For example, in the present embodiment, the case where the present invention is applied to a rear seat back that is divided into two parts has been described. However, the present invention is not limited to this. For example, a single seat back is also effective when supporting three corners. Moreover, in this embodiment, although the vehicle seat back 16 applied to the car for wagons was demonstrated, it is not limited to it, The vehicle seat back 16 applied to the car for sedan or other vehicles It may be a frame structure. In the case of a sedan type automobile, since the headrest is fixed at the center position in the width direction of the panel frame, the thick portions on both the left and right sides may have the same thickness and width. In this respect, the wagon car is more suitable for application of the present invention because the torsional rigidity is difficult to ensure due to the structure of the rear seat 10 in the case of supporting three points compared to the sedan car.

In the present embodiment, the thick portions provided on the left and right sides of the panel frame have been described on the premise that the thick portions have a rectangular shape with respect to the plate thickness and width. For example, a trapezoidal shape or the like is applicable without limitation.
Furthermore, when the vehicle seat is the rear seat 10, a reinforcing frame fixed to the frame frame 20 may be separately provided in order to withstand the load caused by the movement of the luggage placed in the luggage compartment. According to the present invention, it is possible to substantially cancel the increase in weight associated with the installation of such a reinforcing frame.
In addition, the fixing surface of the vehicle seat back includes not only the case of bolt fixing but also the case of fixing by welding.

The frame structure of a panel-type vehicle seat back according to the present invention and the vehicle seat back having the structure are used not only for automobiles but also for general vehicles that are transported in the state in which a person such as a railway vehicle or an airplane is seated on the seat. In a flat panel frame that can be applied and functions as a strength member, the rigidity required for strength can be obtained without making the thickness of the flat plate uniform over the entire plate. It is possible to set the plate thickness corresponding to the position required to secure the vehicle. In this respect, weight reduction is achieved while ensuring the required strength or required rigidity of the vehicle seat back.

It is a front view of the panel frame structure of the vehicle seat back which concerns on embodiment of this invention. It is a side view of the panel frame structure of the vehicle seat back which concerns on embodiment of this invention. It is a front view which shows the condition comprised with the tailored blank material of the panel of the vehicle seat back which concerns on embodiment of this invention. It is a fragmentary perspective view which shows the condition where the vehicle seat back which concerns on embodiment of this invention is fixed to a vehicle. It is a front view of the frame structure of the conventional vehicle seat back. It is sectional drawing which follows the BB line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Vehicle compartment floor 14 Seat cushion 16 Vehicle seat back 18 Panel frame 20 Bead 22 Grommet holder fixing bracket 24 Headrest fixing bracket 26 Lock unit fixing bracket 28 Armrest fixing bracket 30 Opening 32 Thick part 34 Thin portion 36 Fixing surface 50 Body floor 52 Center hinge portion 54 Bracket portion 56 Bolt 58 Wheel house 60 Side hinge portion 62 Bracket portion 64 Bolt 66 Locking part 67 Bracket 68 Bolt 70 Striker

Claims (10)

A frame structure of a panel type vehicle seat back,
It has a flat panel frame with a substantially rectangular shape,
This panel frame has a thick portion over the entire height direction on each of the left and right sides, while a thin portion is provided between both thick portions,
A fixing surface for a vehicle seat back is formed at the lower end of each thick portion,
The panel frame is welded with the side edges of the three plate members corresponding to the thick part on the left and right sides of the panel frame and the thin part between the thick parts in the vertical direction of the vehicle seat back. Made of tailored blank material formed by
A frame structure of a panel type vehicle seat back characterized by the above.     The panel frame protrudes in the vertical direction of the vehicle seat back by three side edges of the same material corresponding to the thick part on the left and right sides of the panel frame and the thin part between the thick parts. The frame structure of the panel-type vehicle seat back according to claim 1, comprising a tailored blank material formed by applying and welding.     The panel frame is welded with the side end portions of the three plate members corresponding to the thick portions on both the left and right sides of the panel frame and the thin portions between the thick portions abutting in the vertical direction of the vehicle seat back. The panel-type vehicle seat back frame according to claim 1, wherein the plate material corresponding to both thick portions and the plate material corresponding to the thin portions are made of different materials. Construction.     The three plate members each have a rectangular shape having a length of one side corresponding to the height of the panel frame, and constitute a panel frame by welding side edges of one side of the three plate members. 4. A frame structure of a panel type vehicle seat back according to 3.     5. The thickness and / or width of the thick portion is determined according to the width direction position of the panel frame of the headrest fixed to the upper portion of the panel frame in each thick portion. The frame structure of the panel-type vehicle seat back described in the item. The vehicle is a sedan type automobile, the headrest is fixed at the center position in the width direction of the panel frame,
The frame structure of the panel-type vehicle seat back according to claim 5, wherein the thick portions on both the left and right sides have the same thickness and width.     The vehicle is a wagon type automobile, the headrest is fixed at a position offset from the center position in the width direction of the panel frame, and the thick part of the thick part on the left and right sides is far from the installation position of the headrest. 6. The frame structure of a panel type vehicle seat back according to claim 5, wherein the height and width are set to be larger than the thickness and width of the thick portion closer to the installation position of the headrest. The vehicle seat back has a two-part structure, and in each of the divided vehicle seat backs, the panel frame is attached to the vehicle at one of the four corners, that is, the lower left and right ends and the upper left and right ends. The frame structure of the panel type vehicle seat back according to any one of claims 1 to 7, wherein the frame structure is supported by the panel type vehicle seat back. The frame of the panel type vehicle seat back according to any one of claims 1 to 8, wherein a bead for securing strength that forms a predetermined pattern by projecting forward is provided on a front surface of the panel frame. Construction. A vehicle seat comprising the vehicle seat back having the frame structure according to any one of claims 1 to 9, and a seat cushion having a lower portion fixed to a passenger compartment floor.

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