Vehicle seat back frame

Abstract

To effectively improve strength of a back frame.SOLUTION: A back frame 1 effectively improves strength at a cross-point Po, that is, a corner part of a panel material 3 in which: a first flange part 52 is welded at at least one side portion divided by a diagonal center line Lo or at a portion crossing the diagonal center line Lo; second flange parts 53, 54 are respectively welded at one side portion divided by the diagonal center line Lo and at the other side portion; and a second reinforcement member 7 at the cross-point Po side is welded with a first wall part 51A while overlapping with the first wall part 51A of a first reinforcement member 5.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present disclosure relates to a back frame that is applied to a seat back of a vehicle seat. [Background technology]

[0002] For example, in the invention described in Patent Document 1, a reinforcing member having an approximately C-shaped or approximately U-shaped cross-section is placed on the edge of a plate-shaped panel material to form a picture-frame-like frame portion, thereby improving the strength of the back frame.

[0003] In the invention described in Patent Document 1, for example, a reinforcing member extending horizontally at the bottom side of the panel material and a reinforcing member extending vertically at the right side of the panel material are connected via a corner bracket. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-14021 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the invention described in Patent Document 1, since the mutually intersecting reinforcing members are connected via the corner brackets, it is difficult to effectively improve the strength of the back frame. The present disclosure discloses an example of a back frame for a vehicle seat in consideration of the above point. [Means for solving the problem]

[0006] It is desirable for a back frame applied to a seat back of a vehicle seat to have at least one of the following configuration requirements, for example. In other words, the constituent elements are a metal panel material (3) configured in a substantially rectangular plate shape, a first reinforcing member (5) fixed to a first side portion (31) of the panel material (3) and extending along the first side portion (31), and a second reinforcing member (7) fixed to a second side portion (32) of the panel material (3) perpendicular to the first side portion (31) and extending along the second side portion (32).

[0007] The first reinforcing member (5) has a first wall portion (51A) facing the panel material (3) via a gap, a second wall portion (51B) extending from an end portion of the first wall portion (51A) that is located on the face center (G) side of the panel material (3) toward the panel material (3), a third wall portion (51C) extending from an end portion of the first wall portion (51A) opposite the second wall portion (51B) toward the panel material (3), a first flange portion (52) extending from a tip end of the second wall portion (51B) in a direction intersecting the extension direction, the first flange portion (52) having at least a portion joined to the panel material (3), and second flange portions (53, 54) extending from a tip end of the third wall portion (51C) in a direction intersecting the extension direction, the second flange portions (53, 54) having at least a portion joined to the panel material (3).

[0008] Furthermore, when the diagonal line of the panel material (3) passing through the imaginary intersection point (Po) of the first side portion (31) and the second side portion (32) is defined as the diagonal center line (Lo), the first flange portion (52) is joined at least on one side of the diagonal center line (Lo) and at least one of the portions crossing the diagonal center line (Lo), the second flange portions (53, 54) are joined at respective portions on one and the other sides of the diagonal center line (Lo), and it is desirable that the intersection point (Po) side of the second reinforcing member (7) is joined to the first wall portion (51A) in a state overlapping the first wall portion (51A).

[0009] As a result, in the vehicle seat back frame, the strength of the intersection (Po), that is, the corner of the panel material (3) can be effectively improved. The vehicle seat back frame may have the following configuration.

[0010] That is, the second reinforcing member (7) includes a first wall portion (71A) facing the panel material (3) with a gap therebetween, a second wall portion (71B) extending from an end portion of the first wall portion (71A) located on the face center (G) side toward the panel material (3), a third wall portion (71C) extending from an end portion of the first wall portion (71A) opposite the second wall portion (71B) toward the panel material (3), and a third wall portion (71C) extending from a tip end of the second wall portion (71B) in a direction intersecting the extending direction. It is desirable that the third wall portion (71C) has one flange portion (72), at least a portion of which is joined to the panel material (3), and a second flange portion (73) extending from the extending end of the third wall portion (71C) in a direction intersecting the extending direction, the second flange portion (73) having at least a portion joined to the panel material (3), and that the first wall portion (51A) of the first reinforcing member (5) and the first wall portion (71A) of the second reinforcing member (7) are joined in an overlapping state.

[0011] As a result, the frame portion (13) formed by at least one of the first reinforcing member (5) and the second reinforcing member (7) and the panel material (3) has a continuous closed cross-sectional shape. Therefore, the load due to an external force can be effectively transmitted to the entire frame portion (13), and stress concentration on a part of the back frame can be suppressed.

[0012] It is preferable that a connecting portion (19) to which a bracket (15) fixed to a vehicle is connected is provided on the frame portion (13). Furthermore, it is preferable that the connecting portion (19) is provided on the intersection (Po) side of the panel material (3) constituting the frame portion (13).

[0013] Incidentally, the symbols in the above parentheses are examples showing the corresponding relationship with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in the above parentheses. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a diagram showing a back frame according to the first embodiment. [Diagram 2] FIG. 2 is a diagram showing a panel material according to the first embodiment. [Diagram 3] 4A to 4C are diagrams showing a first reinforcing member according to the first embodiment. [Figure 4] 4A to 4C are diagrams showing a first reinforcing member according to the first embodiment. [Diagram 5] 3A and 3B are diagrams showing a first reinforcing member and a panel material according to the first embodiment. [Figure 6] FIG. 4 is a diagram showing a part of a frame according to the first embodiment. [Figure 7] 5A to 5C are diagrams showing a second reinforcing member according to the first embodiment. [Figure 8] 3A to 3C are diagrams showing the structure of a frame portion according to the first embodiment. [Figure 9] FIG. 2 is a diagram showing a frame portion according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The following "embodiment of the invention" shows an example of an embodiment that falls within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiment.

[0016] The present embodiment is an example in which a back frame for a vehicle seat (hereinafter, abbreviated as back frame) according to the present disclosure is applied to a back frame of a seat (hereinafter, a vehicle seat) mounted in a vehicle such as a car.

[0017] The back frame is a member that constitutes the framework of the seat back. The seat back is a part that supports the back of a seated person. Note that the arrows and diagonal lines indicating directions in each figure are provided to make it easier to understand the relationships between the figures and the shapes of the members or parts.

[0018] Therefore, the back frame is not limited to the directions shown in each drawing. The directions shown in each drawing are the directions when the back frame is assembled to the vehicle. The drawings with diagonal lines do not necessarily show cross-sectional views.

[0019] At least one of the components or parts that are described with a reference number is provided, unless otherwise specified by "one" or the like. The back frame shown in the present disclosure includes at least one of the components such as the components or parts that are described with a reference number and the structural parts shown in the drawings.

[0020] (First embodiment) <1.Back frame overview> As shown in FIG. 1, the back frame 1 according to this embodiment at least includes a panel material 3, a first reinforcing member 5, a second reinforcing member 7, a third reinforcing member 9, a fourth reinforcing member 11, and the like.

[0021] The panel material 3 is a metal member configured in a substantially rectangular plate shape as shown in Fig. 2. A plurality of projections and recesses (not shown) are provided on a plate surface 3A of the panel material 3. The projections and recesses are integrally formed with the plate surface 3A by press processing (e.g., embossing).

[0022] Hereinafter, the side portion at one end of the panel material 3 in the vertical direction is referred to as a first side portion 31, the side portion at one end of the panel material 3 in the sheet width direction is referred to as a second side portion 32, the side portion at the other end of the panel material 3 in the vertical direction is referred to as a third side portion 33, and the side portion at the other end of the panel material 3 in the sheet width direction is referred to as a fourth side portion 34. Therefore, for example, the first side portion 31 and the second side portion 32 are perpendicular to each other.

[0023] 1, the first reinforcing member 5 is a metal member that is fixed to the first side portion 31 of the panel material 3 and extends along the first side portion 31. The second reinforcing member 7 is a metal member that is fixed to the second side portion 32 of the panel material 3 and extends along the second side portion 32.

[0024] The third reinforcing member 9 is a metal member fixed to the third side 33 of the panel material 3 and extending along the third side 33. The fourth reinforcing member 11 is a metal member fixed to the fourth side 34 of the panel material 3 and extending along the fourth side 32.

[0025] The first reinforcing member 5 and the third reinforcing member 9 have generally the same shape. The second reinforcing member 7 and the fourth reinforcing member 11 have generally the same shape. The following description will be given of the connection structure between the "reinforcing member and the panel material" using the first reinforcing member 5 and the second reinforcing member 7 as examples.

[0026] <2. Connection structure between first reinforcing member and second reinforcing member and panel material> <2.1 First reinforcing member> As shown in Fig. 3, the first reinforcing member 5 is configured to have a main body portion 51, a first flange portion 52, and second flange portions 53 and 54. As shown in Fig. 4, the main body portion 51 is a portion curved in a substantially C-shape or substantially U-shape.

[0027] Specifically, the main body 51 has a first wall 51A, a second wall 51B, and a third wall 51C. As shown in Fig. 5, the first wall 51A is a wall-shaped portion that faces the panel material 3 with a gap therebetween. The first reinforcing member 5 and the second reinforcing member 7 are disposed on the seat front side with respect to the panel material 3.

[0028] The second wall portion 51B is a wall-like portion extending from an end portion (upper end portion in FIG. 5) of the first wall portion 51A that is located on the face center G (see FIG. 1) side of the panel material 3 toward the panel material 3. Note that the face center G refers to the position where the area moment is balanced when the panel material 3 is a simple plate with no unevenness.

[0029] The third wall portion 51C is a wall-shaped portion extending from an end portion of the first wall portion 51A opposite to the second wall portion 51B (the lower end portion in FIG. 5) toward the panel material 3. The second wall portion 51B on the second reinforcing member 7 side is curved so that the center of curvature is on the face center G side, as shown in FIG.

[0030] 3, in this embodiment, the portion 51D is also located at the end opposite to the second wall portion 51B. That is, the third wall portion 51C according to this embodiment is provided at the lower end of the first reinforcing member 5 and the right end of the first reinforcing member 5, that is, at the end of the first reinforcing member 5 in the longitudinal direction.

[0031] The first flange portion 52 is a portion extending from the tip of the second wall portion 51B in a direction intersecting the extension direction. The second flange portions 53 and 54 are portions extending from the tip of the third wall portion 51C in a direction intersecting the extension direction.

[0032] 6, at least a portion of the first flange portion 52 and the second flange portions 53, 54 is joined to the panel material 3 by welding (laser welding in this embodiment). In addition, in FIG. 6, the symbol W indicates a weld bead line or the like.

[0033] Specifically, the first flange portion 52 is welded at least at one of the portions on at least one side of the diagonal centerline Lo and at least one of the portions crossing the diagonal centerline Lo. Note that the diagonal centerline Lo refers to a diagonal line of the panel material 3 that passes through a virtual intersection point Po of the first side portion 31 and the second side portion 32 as shown in FIG.

[0034] The phrase "the first flange portion 52 is welded at least at one of the portions on at least one side of the diagonal center line Lo and at least one of the portions crossing the diagonal center line Lo" refers to, for example, any of the following four states or a combination thereof. In this embodiment, the following states are (b) and (d).

[0035] (1) When the weld bead line W between the first flange portion 52 and the panel material 3 is on one side of the diagonal center line Lo (2) When the weld bead line W is on the other side of the diagonal center line Lo (3) When the weld bead line W is on one side and the other side of the diagonal center line Lo (4) The weld bead line W crosses the diagonal center line Lo.

[0036] The second flange portion 53 is welded at a location on one side of the diagonal center line Lo, and the second flange portion 54 is welded at a location on the other side of the diagonal center line Lo. Note that the "one side" above is, for example, the "left side as you face it" in Fig. 6, and the "other side" above is the "right side as you face it" in Fig. 6.

[0037] <2.2 Second reinforcing member> 7, the second reinforcing member 7 is configured to have a main body portion 71, a first flange portion 72, and a second flange portion 73. The main body portion 71 is a portion curved in a substantially C-shape or a substantially U-shape.

[0038] Specifically, the main body 71 has a first wall 71A, a second wall 71B, and a third wall 71C. The first wall 71A is a wall-like portion facing the panel material 3 with a gap therebetween. The second wall 71B is a wall-like portion extending from an end portion of the first wall 71A located on the face center G side toward the panel material 3, as shown in FIG.

[0039] 7, the third wall portion 71C is a wall-shaped portion extending from an end portion of the first wall portion 71A opposite to the second wall portion 71B toward the panel material 3. The first flange portion 72 is a portion extending from the tip of the extending direction of the second wall portion 71B in a direction intersecting the extending direction.

[0040] The second flange portion 73 is a portion extending from the leading end of the third wall portion 71C in a direction intersecting the extending direction. As shown in Fig. 6, the first flange portion 72 and the second flange portion 73 are at least partially joined to the panel material 3 by welding.

[0041] <2.3 Connection structure between the first reinforcing member and the second reinforcing member> The first reinforcing member 5 and the second reinforcing member 7 are welded to the first wall portion 51A with the intersection Po side of the second reinforcing member 7 (in Figure 6, the lower end side of the second reinforcing member 7) overlapping the first wall portion 51A.

[0042] Specifically, the first wall portion 51A of the first reinforcing member 5 and the first wall portion 71A of the second reinforcing member 7 are welded in an overlapping state. In this embodiment, the first wall portions 51A and 71A overlap with the crossing point Po side of the second reinforcing member 7 fitted into the main body portion 51 of the first reinforcing member 5. Then, the overlapping portion is laser welded.

[0043] Therefore, the area surrounded by the first reinforcing member 5 to the fourth reinforcing member 11 and the panel material 3 has a closed cross-sectional shape as shown in Fig. 5. The area surrounded by the first reinforcing member 5 to the fourth reinforcing member 11 and the panel material 3 becomes a rectangular frame portion 13 (see Fig. 1) made of pipes (square pipes in this embodiment).

[0044] <2.4 Connection between the back frame and the vehicle> 1, the back frame 1 is connected to a vehicle body via brackets 15 and 17. The connection portions between the brackets 15 and 17 and the back frame 1 are provided on the frame portion 13.

[0045] In particular, the bolt 19 forming the connection between the bracket 15 and the back frame 1 is provided on the intersection Po side of the panel material 3 constituting the frame portion 13, as shown in Fig. 8. In other words, the bolt 19 is disposed in an area A of the panel material 3 that is defined by a virtual line connecting the weld bead lines W of the first flange portion 52 and the second flange portions 53, 54, as shown in Fig. 9.

[0046] <3. Features of the back frame according to this embodiment> As shown in FIG. 9, the first flange portion 52 is welded at least on one side of the diagonal centerline Lo and at a portion crossing the diagonal centerline Lo, and the second flange portions 53, 54 are welded at portions on one side and the other side of the diagonal centerline Lo.

[0047] The second reinforcing member 7 is welded to the first wall portion 51A of the first reinforcing member 5 in a state where the second reinforcing member 7 is overlapped with the first wall portion 51A of the first reinforcing member 5. This effectively improves the strength of the back frame 1 according to this embodiment at the intersection Po, i.e., at the corner of the panel material 3.

[0048] The first wall portion 51A of the first reinforcing member 5 and the first wall portion 71A of the second reinforcing member 7 are welded in an overlapping state. This makes the frame portion 13 a portion with a continuous closed cross section. Therefore, the load due to an external force can be effectively transmitted to the entire frame portion 13, and stress concentration on a part of the back frame can be suppressed.

[0049] In this embodiment, the connection structure between the second reinforcing member 7 and the third reinforcing member 9, the connection structure between the third reinforcing member 9 and the fourth reinforcing member 11, and the connection structure between the fourth reinforcing member 11 and the first reinforcing member 5 are the same as the connection structure between the first reinforcing member 5 and the second reinforcing member 7. Therefore, the strength of the back frame 1 according to this embodiment is reliably improved.

[0050] (Other embodiments) In the above-described embodiment, the components are joined by laser welding. However, the present disclosure is not limited to this. That is, the present disclosure may be joined by, for example, an adhesive or by welding other than laser welding, such as electric welding.

[0051] In the above embodiment, the bolt 19 that connects the bracket 15 and the back frame 1 is connected to the panel material 3. However, the present disclosure is not limited to this. That is, the present disclosure may be configured to connect, for example, to the first reinforcing member 5 or the second reinforcing member 7.

[0052] The second to fourth reinforcing members 11 according to the above-described embodiment also have a C-shaped or U-shaped main body portion, similar to the first reinforcing member 5. However, the present disclosure is not limited to this. That is, in the present disclosure, for example, the second to fourth reinforcing members 11 may be configured in an L-shape.

[0053] The frame 13 according to the above embodiment has a rectangular closed cross-sectional shape. However, the present disclosure is not limited to this. That is, in the present disclosure, the frame 13 may have an oval or circular closed cross-sectional shape, for example.

[0054] In the above-described embodiment, the bolt 19 forming the connection between the bracket 15 and the back frame 1 is connected to the panel material 3 constituting the frame portion 13. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the bolt 19 is connected to the first reinforcing member 5 or the second reinforcing member 7, for example.

[0055] In the above-described embodiment, the first reinforcing member 5 is disposed on the first side 31 side, and the second reinforcing member 7 is disposed on the second side 32 side. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, such that the second reinforcing member 7 is disposed on the first side 31 side, and the first reinforcing member 5 is disposed on the second side 32 side.

[0056] In the above embodiment, the vehicle seat according to the present disclosure is applied to a vehicle. However, the application of the invention disclosed in this specification is not limited thereto. That is, the disclosure can be applied to, for example, seats used in vehicles such as railroad cars, ships, and aircraft, as well as stationary seats used in theaters, homes, and the like.

[0057] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it is consistent with the gist of the disclosure described in the above-mentioned embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-mentioned embodiments are combined, or a configuration in which any of the components illustrated or the components described with reference numerals in the above-mentioned embodiments are eliminated. [Explanation of symbols]

[0058] 1... Back frame 3... Panel material 5... First reinforcing member 7... second reinforcing member 9... third reinforcing member 11... fourth reinforcing member 13: Frame portion 15: Bracket 52: First flange portion 53, 54... Second flange section

Claims

1. A back frame applied to a seat back of a vehicle seat, A metal panel material formed in a substantially rectangular plate shape; a first reinforcing member fixed to a first side portion of the panel material, the first reinforcing member being made of metal and extending along the first side portion; a second reinforcing member fixed to a second side of the panel material perpendicular to the first side, the second reinforcing member being made of metal and extending along the second side; The first reinforcing member is a first wall portion facing the panel material with a gap therebetween; a second wall portion extending from an end portion of the first wall portion located on the face center side of the panel material toward the panel material; a third wall portion extending from an end portion of the first wall portion opposite the second wall portion toward the panel material; a first flange portion extending from a tip end of the second wall portion in a direction intersecting the extending direction, the first flange portion having at least a portion joined to the panel material; and a second flange portion extending from a tip end of the third wall portion in a direction intersecting the extension direction, the second flange portion having at least a portion joined to the panel material; When a diagonal line of the panel material passing through a virtual intersection point between the first side portion and the second side portion is defined as a diagonal center line, The first flange portion is joined at least at one of a portion on at least one side of the diagonal center line and a portion crossing the diagonal center line, The second flange portion is joined at one side and the other side of the diagonal center line, Furthermore, the second reinforcing member is joined to the first wall portion on the intersection side in a state where the second reinforcing member overlaps the first wall portion.

2. The second reinforcing member is a first wall portion facing the panel material with a gap therebetween; a second wall portion extending from an end portion of the first wall portion located on the face center side toward the panel material; a third wall portion extending from an end portion of the first wall portion opposite the second wall portion toward the panel material; a first flange portion extending from a tip end of the second wall portion in a direction intersecting the extending direction, the first flange portion having at least a portion joined to the panel material; a second flange portion extending from a tip end of the third wall portion in a direction intersecting the extension direction, the second flange portion having at least a portion joined to the panel material; 2. The back frame for a vehicle seat according to claim 1, wherein the first wall portion of the first reinforcing member and the first wall portion of the second reinforcing member are joined in an overlapping state.

3. When a portion having a closed cross section formed by at least one of the first reinforcing member and the second reinforcing member and the panel material is defined as a frame portion, 3. The back frame for a vehicle seat according to claim 2, wherein the frame portion is provided with a connecting portion to which a bracket fixed to a vehicle is connected.

4. The back frame for a vehicle seat according to claim 3 , wherein the connecting portion is provided on the panel material constituting the frame portion on a side facing the intersection.

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