JP2012161447A - Seat frame for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat frame for a vehicle seat, which eliminates waste of materials, causes no increase in weight, and enables stable welding to be performed.SOLUTION: The respective ends in the longitudinal direction of a plurality of long frame members are welded. Each of the frame members F3, F4 is formed of a sheet material and has a hat-like cross sectional shape. Then, in the longitudinal end part of the frame members, a connecting direction face Ma having prescribed lengths L32, L23 along the connecting direction toward the opposite frame members to be welded and a width equivalent to the thickness t of the sheet material, a projecting face Mb formed along the hat-like cross sectional shape, with the end of the connecting direction face Ma as a starting point, and a recessed face Mc formed along the hat-like cross sectional shape, with the end of the connecting direction face Ma as a starting point, are formed. The connecting direction faces Ma of the respective frame members to be welded with each other are placed oppositely to each other, brought into contact with each other, and butt-welded.

Description

  The present invention relates to a seat frame constituting a part of a vehicle seat.

In recent years, a seat frame of a vehicle seat used for a vehicle such as a vehicle, for example, as shown in FIGS. 4 (A) and 4 (B), is an end portion of each frame having a cross section perpendicular to the longitudinal direction. Are assembled in a frame shape by welding them facing each other.
Moreover, in the prior art described in Patent Document 1 shown in FIGS. 4C and 4D, in order to further reduce a dimensional error when welding the end portions of two frame members having a hat cross-sectional shape, 2 The end portions of the plate members 103F and 104F are overlapped and spot welded at the welding points SP1 to SP4 (see FIG. 4C), and then press-molded to have a hat cross-sectional shape (FIG. 4D). reference).

JP-A-3-268878

The conventional technique described in Patent Document 1 (see FIGS. 4C and 4D) is not preferable because an extra material is required at the portion overlapped in the thickness direction and the weight increases. In addition, when a plurality of frame members are connected to form a curved shape or a frame shape, the die of the press device is undesirably enlarged.
Further, in the conventional welding method shown in FIGS. 4A and 4B, when forming a frame shape using a plurality of frame members, for example, in order to keep the dimension of the formed frame shape within an allowable error, There is a possibility that a gap ΔE may be generated at the connecting portion (in this case, the connecting portion between the frame member 101F and the frame member 102F). When this gap ΔE occurs, it is very difficult to weld so as to fill the gap, and welding may not be possible depending on the distance of the gap, and stable welding cannot be performed.
Therefore, as shown in FIGS. 4E and 4F, there is a method in which an overlapping portion 106T for overlapping in the thickness direction is formed on the end portion of one frame member 106F. In this method, even if a dimensional error occurs in the connection direction, the error in the connection direction is absorbed while the inner surface M105 of the other frame member 105F and the outer surface M106 of the one frame member 106F are maintained in contact with each other. The welding point Y105 can be arc welded by adjusting to the above. However, since an extra material is required at the overlapping portion of the overlapping portion 106T and the weight increases, it is not preferable.

  The present invention was devised in view of such a point, and provides a seat frame for a vehicle seat that can perform stable welding without causing waste of materials and without causing an increase in weight. The task is to do.

In order to solve the above problems, the seat frame of the vehicle seat according to the present invention takes the following means.
First, a first invention of the present invention is a seat frame for a vehicle seat, wherein each of a plurality of long frame members is welded at the longitudinal ends.
Each of the frame members is formed of a plate material, and a cross-sectional shape orthogonal to the longitudinal direction is a hat cross-sectional shape, and each frame member to be welded to each other is along a connecting direction toward the frame member of the welding partner. A connection direction surface having a predetermined length and a width corresponding to the thickness of the plate member forming the frame member, and a side closer to the frame member of the welding partner along the connection direction in the connection direction surface. A projecting surface having a width corresponding to the thickness of the plate material starting from the end and extending in a direction intersecting the connection direction along the hat cross-sectional shape, and along the connection direction in the connection direction surface A dent having a width corresponding to the thickness of the plate material and extending in a direction crossing the connection direction along the hat cross-sectional shape, starting from an end far from the frame member to be welded Has the, to the connecting portion between the welding partner.
And the said connection direction surface of each flame | frame member mutually welded is made to oppose, and the said contact direction surface which contacted is butted and welded.

According to the first aspect of the invention, since the position in the connection direction can be adjusted in a state where the connection direction surfaces formed along the connection direction are in contact with each other, the frame can be formed without generating a gap in the opposing direction of the connection direction surface. The member can be positioned by sliding in the connecting direction (the other frame member can be positioned with respect to one frame member).
Thereby, since there is no portion to be overlapped in the thickness direction, there is no waste of material and the weight is not increased. Moreover, since a gap in the opposite direction is not generated on the connection direction surfaces facing each other, stable welding can be performed.

  Next, a second aspect of the present invention is a seat frame for a vehicle seat according to the first aspect of the present invention, in which one frame member is provided around the connection direction surface of each frame member welded to each other. And the recessed surface of the other frame member, the recessed surface of one frame member, and the protruding surface of the other frame member are opposed to each other, and in the connecting direction of each frame member A gap corresponding to the length error is set.

According to the second aspect of the invention, the interval between the protruding surface of one (or the other) frame member and the recessed surface of the other (or one) frame member is set to an interval corresponding to the length error in the connection direction. Thus, even when the dimension in the connection direction is slightly short or slightly long, the gap can be adjusted appropriately, and the dimensional variation in the connection direction in each frame member can be absorbed.
Thereby, the dimension error of the connection direction in each frame member can be absorbed appropriately, and the stable welding can be performed, without producing the clearance gap of an opposing direction on the mutual connection direction surface made to oppose.

  Next, a third invention of the present invention is a vehicle seat frame according to the first or second invention, further comprising a planar panel member, wherein the plurality of frame members are The edge section in the hat cross-sectional shape is arranged so as to abut on the plane of the panel member, and the edge part in contact with the panel member in each frame member is welded to the panel member, and a rectangular frame Arranged in a shape.

  According to the third aspect, the seat frame can be realized in an appropriate shape. Further, even when a plurality of frame members are connected in a frame shape, dimensional errors in the connection direction can be appropriately absorbed and stable welding can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining one embodiment of the seat frame 1 of the vehicle seat of this invention, (A) shows the perspective view of the frame members F1-F4 and the panel member P before welding, (B) is after welding. The perspective view of the frame members F1-F4 of this and the panel member P is shown. (A) is a perspective view for explaining the shape of the ends of the frame members F3 and F2 before welding in the AA portion shown in FIG. 1 (B), and (B) is a frame member in FIG. 2 (A). The figure which looked at F3 from the B direction is shown, (C) has shown the figure which looked at the AA part shown to FIG. 1 (B) from the C direction. The figure which looked at the seat frame 1 shown to FIG. 1 (B) from C direction is shown. (A) And (B) is a figure explaining the 1st welding method of the conventional frame members 101F and 102F, (C) and (D) are the conventional frame members 103F and 104F (plate material 103F, 104F). (E) and (F) are diagrams for explaining a third welding method for conventional frame members 105F and 106F.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. 1A and 1B show perspective views of an embodiment of a seat frame 1 of a vehicle seat of the present invention. FIG. 1A shows frame members F1 to F4 before welding. Panel member P is shown, and FIG. 1 (B) shows frame members F1 to F4 and panel member P after welding.

● [Overall structure of vehicle seat frame 1 (Fig. 1)]
Next, the overall structure of the seat frame 1 will be described with reference to FIGS. In the present embodiment, the end portions of the four long frame members F1 to F4 are welded to form a rectangular frame, and the frame members F1 to F4 are welded to the planar panel member P. An example of frame 1 is shown.
Each of the frame members described in this embodiment is formed of a plate material (for example, press-molded), and a cross-sectional shape orthogonal to the longitudinal direction is a hat cross-sectional shape (see FIG. 2B). .
In the example of the present embodiment, the frame members F1 and F2 have a substantially linear shape, and the frame members F3 and F4 have a substantially U-shape.

● [Frame member cross-sectional shape and frame member end shape (Fig. 2)]
Next, the cross-sectional shapes of the frame members F1 to F4 and the shapes of the end portions in the longitudinal direction of the frame members F1 to F4 (connection portions with welding partners) will be described with reference to FIGS.
FIG. 2 (A) shows a state before welding in the AA portion of FIG. 1 (B), the shape of the end of the frame member F3 on the frame member F2 side, and the end of the frame member F2 on the frame member F3 side. The shape of the part is shown.

The end of the frame member F3 corresponds to a predetermined length L32 along the connection direction toward the frame member to be welded (in this case, the frame member F2) and the thickness t of the plate member forming the frame member F3. A connection direction surface Ma having a width to be formed is formed.
In addition, at the end of the frame member F3, the thickness t of the plate material forming the frame member F3 is set as the starting point from the end MaS on the side close to the frame member of the welding partner along the connection direction in the connection direction surface Ma. A protruding surface Mb having a corresponding width and extending in the direction intersecting the connection direction (in this case, the orthogonal direction) along the hat cross-sectional shape is formed.
In addition, at the end of the frame member F3, the thickness t of the plate member forming the frame member F3 is set starting from the end MaU on the side far from the frame member of the welding partner along the connection direction in the connection direction surface Ma. A concave surface Mc having a corresponding width and extending in the direction crossing the connection direction (in this case, the direction orthogonal) along the hat cross-sectional shape is formed.
Similarly, a connection direction surface Ma, a projecting surface Mb, and a recessed surface Mc are also formed at the end of the frame member F2.

Here, the connection direction is a connection direction of the frame members to be connected as shown in FIG. 2 (A). However, as shown in frame members F3 and F4 in FIG. 1 (A), the end portions of the frame members are connected. Is bent, the direction toward the frame member of the connection partner (welding partner) along the bending direction is the connection direction.
Of course, when the end of the frame member F3 and the end of the frame member F2 are opposed to each other, the connection direction surface Ma of the frame member F3 and the connection direction surface Ma of the frame member F2 are opposed to each other. Each projecting surface Mb, each projecting surface Mb is formed such that one projecting surface Mb and the other recessed surface Mc face each other, and the other projecting surface Mb and one recessed surface Mc face each other. A recessed surface Mc is formed.
Then, as shown in FIG. 2C, the connection direction surfaces Ma of the frame members F3 and F2 to be welded to each other are arranged so as to face each other, and the connection direction surfaces Ma that are in contact with each other are Butt welding is performed at the welding point Y32.

  When there is a dimensional error in the connection direction, as shown in FIG. 2C, around the connection direction surface Ma of the frame members F3 and F2 to be welded to each other, The recessed surface Mc of the other frame member is opposed, and the protruding surface Mb of the other frame member is opposed to the recessed surface Mc of the one frame member. The projecting surface Mb and the recessed surface Mc facing each other have gaps ΔD32 and ΔD23. The gaps ΔD32 and ΔD23 are appropriately set according to an error in the length in the connecting direction of the frame members F3 and F2. Even if the length error in the connection direction varies, the gaps ΔD32 and ΔD23 are appropriately adjusted, and the frame members F3 and F2 are slid in the connection direction while maintaining the connection direction surface Ma in contact. Just do it. For this reason, since the mutual connection direction surface Ma made to oppose is not separated, stable welding can be performed.

  In the example of the present embodiment, as illustrated in FIGS. 2A to 2C, the example in which the connection direction surface Ma is formed on the top Fum in the hat cross-sectional shape illustrated in FIG. 2B has been described. However, the connection direction surface Ma may be formed at the edge Ffm or at a position between the top Fum and the edge Ffm in FIG. Moreover, you may form so that it may have two connection direction surfaces Ma by each frame member like uneven | corrugated shape.

● [Welding points in the seat frame 1 (Fig. 3)]
Next, the welding location of the frame members F1 to F4 and the panel member P in the seat frame 1 will be described with reference to FIG.
Each dimension (rectangular vertical direction (Y-axis direction), rectangular horizontal direction (X-axis direction)) formed by the frame members F1 to F4 combined with the panel member P is set in advance. The frame members F1 to F4 are positioned and welded with respect to the panel member P so as to fit within the tolerances.
The shape of the frame members F1 to F4 shown in the example of FIG. 3 is a shape in which the error in the X-axis direction of the rectangle can be adjusted and the error in the Y-axis direction of the rectangle cannot be adjusted, but is limited to this shape. Is not to be done. For example, the frame members F3 and F4 are further divided into two parts so that the connection direction surface, the protruding surface, and the recessed surface are formed by F3A and F4A indicated by dotted lines in FIG. For example, in addition to adjusting the error in the X-axis direction, the error in the Y-axis direction can be adjusted.

The plurality of frame members F <b> 1 to F <b> 4 are arranged so that the edge in the hat cross-sectional shape (the edge Ffm in FIGS. 2A and 2B) abuts on the plane of the panel member P. And the edge part which is in contact with the panel member P in the frame members F1-F4 is welded with the panel member P, and the frame members F1-F4 are arrange | positioned at the substantially rectangular frame shape.
Note that the distance between the gaps ΔD13 and ΔD31 is adjusted between the frame member F1 and the frame member F3, and the welding portion Y31 is laser-welded or arc-welded. The frame member F1 is welded to the panel member P at the welding points Y1s and Y1u (edges) continuously or intermittently, and the frame member F3 is the panel at the welding points Y3s and Y3u (edges) continuously or intermittently. The member P is laser welded.
Similarly, the distance between the gaps ΔD14 and ΔD41 is adjusted between the frame member F1 and the frame member F4, the distance between the gaps ΔD23 and ΔD32 is adjusted between the frame member F2 and the frame member F3, and the distance between the frame members F2 and F4 is ΔD24, The distance of ΔD42 is adjusted, and the welding points Y14, Y32, and Y24 are laser welded or arc welded, respectively. The frame member F2 is laser welded to the panel member P at the welding points Y2s and Y2u (edges) continuously or intermittently, and the frame member F4 is welded at the welding points Y4s and Y4u (edges) continuously or intermittently. The panel member P is laser welded.

The seat frame of the vehicle seat of the present invention is not limited to the appearance, shape, configuration, structure, welding method, etc. described in the present embodiment, and various modifications, additions, and deletions are possible without departing from the scope of the present invention. Is possible.
For example, the shapes of the frame members F1 to F4 and their connection directions are not limited to the shapes and connection directions described in the present embodiment. Moreover, although the example which comprises the seat frame 1 with four frame members was demonstrated, it is not limited to four.

DESCRIPTION OF SYMBOLS 1 Seat frame F1-F4 Frame member Ffm Edge Fum Top part Ma Connection direction surface MaS End part MaU End part Mb Protrusion surface Mc Recessed surface P Panel member Y14, Y24, Y31, Y32 Welding place Y1s, Y1u, Y2s, Y2u, Y3s , Y3u, Y4s, Y4u welding locations

Claims (3)

In the seat frame of the vehicle seat, which is configured by welding the longitudinal ends of each of the plurality of long frame members,
Each of the frame members is formed of a plate material, and a cross-sectional shape orthogonal to the longitudinal direction is a hat cross-sectional shape,
Each frame member welded together is
A connection direction surface having a predetermined length along the connection direction toward the frame member of the welding partner, and a width corresponding to the thickness of the plate member forming the frame member;
The connection direction surface has a width corresponding to the thickness of the plate member, and has the width corresponding to the thickness of the plate material, starting from an end of the connection direction surface close to the frame member of the welding partner, and the connection direction along the hat cross-sectional shape. A protruding surface extending in the intersecting direction;
The connection direction surface has a width corresponding to the thickness of the plate member and has the width corresponding to the thickness of the plate material, starting from an end portion on the side far from the frame member of the welding partner along the connection direction in the connection direction surface, and the connection direction along the hat cross-sectional shape. A concave surface extending in the intersecting direction, and a connecting portion with the welding partner,
The connection direction surfaces of the frame members to be welded to each other are in contact with each other, and the contact direction surfaces that are contacted are abutted and welded.
Vehicle seat frame. The vehicle seat frame according to claim 1,
Around the connection direction surface of each frame member welded to each other, the protruding surface of one frame member, the recessed surface of the other frame member, the recessed surface of one frame member, and the other frame member The projecting surfaces are opposed to each other, and a gap is set according to an error in the length of each frame member in the connection direction.
Vehicle seat frame. A vehicle seat frame according to claim 2,
Furthermore, a flat panel member is provided,
The plurality of frame members are:
An edge portion in the hat cross-sectional shape is arranged so as to abut on a plane of the panel member, and the edge portion in contact with the panel member in each frame member is welded to the panel member to form a rectangular frame shape Located in the
Vehicle seat frame.

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