Backrest frame for vehicle seat

Abstract

The present disclosure pertains to a backrest frame for a vehicle seat, in which a first flange portion of a first reinforcing member is joined to a panel member at a location on at least one side separated by a diagonal center line of the panel member or at a location spanning the diagonal center line, and a second flange portion of a second reinforcing member is joined to the panel member at a location spanning the diagonal center line. The second flange portion of the first reinforcing member is joined to the panel member at both one side and the other side separated by the diagonal center line. The second reinforcing member is joined to the first wall portion of the first reinforcing member in a state where one side of the second reinforcing member, which is located at an intersection point between the first side portion and the second side portion of the panel member, overlaps the first wall portion of the first reinforcing member.

Description

Technical Field

[0001] The present disclosure relates to a backrest frame of a seat back applied to a vehicle seat. Background Art

[0002] For example, in the invention described in Japanese Patent Application Laid-Open No. 2023-14021 (hereinafter referred to as Patent Document 1), a substantially C-shaped or substantially The reinforcing component has a U-shaped cross section and forms a frame portion in the shape of a picture frame, thereby improving the strength of the backrest frame.

[0003] Furthermore, in the invention described in Patent Document 1, for example, a reinforcing member extending horizontally at the bottom edge of the panel member and a reinforcing member extending vertically at the right edge of the panel member are connected to each other via a corner bracket. Summary of the invention

[0004] In the invention described in Patent Document 1, since the mutually intersecting reinforcement members are connected to each other via the corner brackets, it is difficult to effectively improve the strength of the back frame. In view of the above-mentioned problems, the present disclosure discloses an example of a back frame for a vehicle seat.

[0005] A backrest frame of a seat back applied to a vehicle seat preferably includes, for example, at least one of the following components.

[0006] That is, the constituent elements are: a panel component, the panel component is made of metal and is formed into a roughly rectangular plate shape; a first reinforcing component, the first reinforcing component is fixed to the first side of the panel component and extends along the first side, the first reinforcing component is made of metal; and a second reinforcing component, the second reinforcing component is fixed to the second side of the panel component that is orthogonal to the first side and extends along the second side, the second reinforcing component is made of metal.

[0007] Furthermore, the first reinforcing member comprises: a first wall portion, the first wall portion being opposite to the panel member with a gap therebetween; a second wall portion, the second wall portion extending toward the panel member from an end portion of the first wall portion located on the face center side of the panel member; a third wall portion, the third wall portion extending toward the panel member from an end portion of the first wall portion located on the opposite side of the second wall portion; a first flange portion, the first flange portion extending from a front end of the second wall portion in an extending direction along a direction intersecting with the extending direction, and at least a portion of the first flange portion being joined to the panel member; and a second flange portion, the second flange portion extending from a front end of the third wall portion in an extending direction along a direction intersecting with the extending direction, and at least a portion of the second flange portion being joined to the panel member.

[0008] In addition, when the diagonal line of the panel component passing through the virtual intersection of the first side and the second side is taken as the diagonal center line, the first flange portion is preferably joined to the panel component at a portion on at least one side divided by the diagonal center line and at least one of the portions crossing the diagonal center line, and the second flange portion is preferably joined to the panel component at a portion on one side divided by the diagonal center line and at a portion on the other side, and the second reinforcement portion is joined to the first wall portion on one side of the intersection in a state of overlapping with the first wall portion.

[0009] Thus, in the vehicle seat back frame, the strength of the intersection, that is, the corner of the panel member can be effectively improved.

[0010] Furthermore, the vehicle seat back frame may have the following configuration.

[0011] That is, the second reinforcing member preferably comprises: a first wall portion, the first wall portion being opposite to the panel member with a gap therebetween; a second wall portion, the second wall portion extending toward the panel member from an end portion of the first wall portion located on the face center side of the panel member; a third wall portion, the third wall portion extending toward the panel member from an end portion of the first wall portion located on the opposite side of the second wall portion; a first flange portion, the first flange portion extending from the front end of the second wall portion in the extension direction along a direction intersecting the extension direction, and at least a portion of the first flange portion is joined to the panel member; and a second flange portion, the second flange portion extending from the front end of the third wall portion in the extension direction along a direction intersecting the extension direction, and at least a portion of the second flange portion is joined to the panel member, and 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.

[0012] Therefore, the frame portion formed by the reinforcing member of at least one of the first reinforcing member and the second reinforcing member and the panel member becomes a portion with a continuous closed cross-sectional shape. Therefore, the load caused by the external force can be effectively transmitted to the entire frame portion, and the stress concentration on a part of the backrest frame can be suppressed.

[0013] Furthermore, it is preferred that the frame portion is provided with a connecting portion for connecting to a bracket fixed to a vehicle. In addition, it is preferred that the connecting portion is provided on one side of the intersection of the panel members constituting the frame portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a figure which shows the backrest frame of 1st Embodiment.

[0015] Figure 2 It is a figure which shows the panel member of 1st Embodiment.

[0016] Figure 3It is a diagram showing the first reinforcement member according to the first embodiment.

[0017] Figure 4 It is a diagram showing the first reinforcement member according to the first embodiment.

[0018] Figure 5 It is a diagram showing the first reinforcement member and the panel member according to the first embodiment.

[0019] Figure 6 This is a diagram showing a part of the frame portion of the first embodiment.

[0020] Figure 7 It is a diagram showing the second reinforcement member according to the first embodiment.

[0021] Figure 8 It is a diagram showing the structure of the frame portion according to the first embodiment.

[0022] Fig. 9 It is a diagram showing a frame portion of the first embodiment. DETAILED DESCRIPTION

[0023] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0024] The embodiment described below is an example of an embodiment to show the technical scope of the present disclosure. That is, the technical solutions and the like described in the claims are not limited to the specific structures or configurations shown in the following embodiment.

[0025] The present embodiment is an example in which a backrest frame for a vehicle seat (hereinafter simply referred to as a “backrest frame”) of the present disclosure is applied to a seat (hereinafter referred to as a “vehicle seat”) installed in a vehicle such as a vehicle.

[0026] The backrest frame refers to a component that constitutes the skeleton of the seat back. The seat back is a part used to support the back of the seated person. In addition, arrows and oblique lines indicating directions in the various drawings are elements of the drawings that are marked to facilitate understanding of the relationship between the various drawings and the shapes of the components or parts.

[0027] Therefore, the backrest frame is not limited to the directions shown in the drawings. The directions shown in the drawings are directions when the backrest frame of the present embodiment is assembled in a vehicle. The drawings marked with oblique lines do not necessarily represent cross-sectional views.

[0028] For components or parts that are at least marked with symbols for explanation, at least one is provided unless it is stated in advance that "only one" is provided. The backrest frame shown in the present disclosure includes components or parts such as components marked with symbols for explanation, and at least one of the structural parts shown in the figure.

[0029] (First embodiment)

[0030] <1. Overview of backrest frame>

[0031] like Figure 1 As shown, the back frame 1 of the present embodiment includes at least a panel member 3 , a first reinforcement member 5 , a second reinforcement member 7 , a third reinforcement member 9 , and a fourth reinforcement member 11 .

[0032] like Figure 2 As shown, the panel component 3 is a component made of metal, which is formed into a roughly rectangular plate shape. A plurality of concave and convex parts (not shown) are provided on the plate surface 3A of the panel component 3. The concave and convex parts are integrally formed on the plate surface 3A by stamping (e.g., embossing).

[0033] Hereinafter, the side portion of one end of the panel component 3 in the vertical direction is referred to as the first side portion 31, the side portion of one end of the panel component 3 in the seat width direction is referred to as the second side portion 32, the side portion of the other end of the panel component 3 in the vertical direction is referred to as the third side portion 33, and the side portion of the other end of the panel component 3 in the seat width direction is referred to as the fourth side portion 34. Therefore, for example, the first side portion 31 and the second side portion 32 are orthogonal.

[0034] like Figure 1 As shown, the first reinforcing member 5 is fixed to the first side 31 of the panel member 3 and extends along the first side 31, and the first reinforcing member 5 is a member made of metal. The second reinforcing member 7 is fixed to the second side 32 of the panel member 3 and extends along the second side 32, and the second reinforcing member 7 is a member made of metal.

[0035] The third reinforcing member 9 is fixed to the third side 33 of the panel member 3 and extends along the third side 33, and is a member made of metal. The fourth reinforcing member 11 is fixed to the fourth side 34 of the panel member 3 and extends along the fourth side 34, and is a member made of metal.

[0036] In addition, the first reinforcing member 5 and the third reinforcing member 9 have substantially the same shape. The second reinforcing member 7 and the fourth reinforcing member 11 have substantially the same shape. Hereinafter, the first reinforcing member 5 and the second reinforcing member 7 are taken as examples to explain the connection structure between the "reinforcing member and the panel member".

[0037] <2. Connection structure between the first reinforcement member and the second reinforcement member and the panel member>

[0038] <2.1 First reinforcement member>

[0039] like Figure 3As shown in FIG. 1 , the first reinforcing member 5 includes a main body 51, a first flange 52, and second flanges 53 and 54. Figure 4 As shown, the main body 51 is bent into a substantially C-shape or substantially The part of the font.

[0040] Specifically, the main body 51 includes a first wall portion 51A, a second wall portion 51B, and a third wall portion 51C. Figure 5 As shown, the first wall portion 51A is a wall-shaped portion that faces the panel member 3 via a gap. In addition, the first reinforcement member 5 and the second reinforcement member 7 are arranged on the front side of the seat with respect to the panel member 3.

[0041] The second wall portion 51B is located at the center G of the surface of the panel member 3 (see Figure 1 ) side end (at Figure 5 The center of surface G is a position where the area moment of the panel member 3 is balanced when the panel member 3 is a simple plate material without concave and convex parts.

[0042] The third wall portion 51C is an end portion of the first wall portion 51A located on the opposite side of the second wall portion 51B (at Figure 5 The wall-like portion (the lower end portion in the figure) extends toward the panel member 3. Figure 1 As shown, the second wall portion 51B is curved on the side located at the second reinforcing member 7 so that the center of curvature is located on the surface center G side.

[0043] Therefore, if Figure 3 As shown, in this embodiment, the portion 51D is also located at the end on the opposite side of the second wall portion 51B. That is, the third wall portion 51C in 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 length direction.

[0044] The first flange portion 52 extends from the front end of the second wall portion 51B in the extending direction in a direction intersecting the extending direction. The second flange portions 53 and 54 extend from the front end of the third wall portion 51C in the extending direction in a direction intersecting the extending direction.

[0045] Moreover, if Figure 6 As shown, the first flange portion 52 and the second flange portions 53 and 54 are joined to the panel member 3 by welding (laser welding in this embodiment) at least in part. Figure 6 In FIG. 1 , symbol W represents a weld line, etc.

[0046] Specifically, the first flange portion 52 is welded to the panel member 3 at least at one of a portion on at least one side divided by the diagonal center line Lo and a portion crossing the diagonal center line Lo. Figure 2 As shown, the diagonal center line lo refers to a diagonal line of the panel member 3 passing through a virtual intersection point Po of the first side portion 31 and the second side portion 32.

[0047] “The first flange portion 52 is welded to the panel member 3 at least at one side of the portion divided by the diagonal center line Lo and at least one of the portions across the diagonal center line Lo” means, for example, any one of the following four states, or a combination of the states. In addition, in the present embodiment, the states are the following (1) and (4).

[0048] (1) When the weld line W between the first flange portion 52 and the panel member 3 is located on one side of the diagonal center line Lo.

[0049] (2) When the weld line W is located on the other side of the diagonal center line Lo.

[0050] (3) When the weld line W is located on one side and the other side of the diagonal center line Lo.

[0051] (4) When the weld line W crosses the diagonal center line lo.

[0052] The second flange 53 is welded to the panel member 3 at a portion on one side divided by the diagonal center line Lo, and the second flange 54 is welded to the panel member 3 at a portion on the other side divided by the diagonal center line Lo. Figure 6 The "left side" indicated by the arrow in the middle, the "other side" mentioned above is, for example, Figure 6 The “right side” indicated by the arrow in the figure.

[0053] <2.2 Second reinforcement member>

[0054] like Figure 7 As shown in FIG. 1 , the second reinforcing member 7 includes a main body 71, a first flange 72, and a second flange 73. The main body 71 is bent into a substantially C-shape or substantially The part of the font.

[0055] Specifically, the main body 71 includes a first wall portion 71A, a second wall portion 71B, and a third wall portion 71C. The first wall portion 71A is a wall-shaped portion that faces the panel member 3 with a gap therebetween. Figure 1 As shown, the second wall portion 71B is a wall-shaped portion extending from an end portion located on the surface center G side among the end portions of the first wall portion 71A toward the panel member 3 .

[0056] like Figure 7 As shown, the third wall portion 71C is a wall-shaped portion extending from the end of the first wall portion 71A located on the opposite side of the second wall portion 71B toward the panel member 3. The first flange portion 72 is a portion extending from the front end of the second wall portion 71B in the extending direction in a direction intersecting the extending direction.

[0057] The second flange portion 73 is a portion extending from the front end of the third wall portion 71C in the extending direction in a direction intersecting the extending direction. Figure 6 As shown, the first flange portion 72 and the second flange portion 73 are both joined to the panel member 3 by welding at least in part.

[0058] <2.3 Connection Structure between First Reinforcement Member and Second Reinforcement Member>

[0059] The first reinforcing member 5 and the second reinforcing member 7 are located on the side of the second reinforcing member 7 at the intersection Po (at Figure 6 The second reinforcing member 7 (in the middle, the lower end side) is welded to the first wall portion 51A in a state overlapping with the first wall portion 51A.

[0060] 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 together in a state of overlapping each other. In addition, in the present embodiment, the first wall portion 51A and the first wall portion 71A overlap each other in a manner that the side of the second reinforcing member 7 located at the intersection Po is embedded in the main body portion 51 of the first reinforcing member 5. Then, the overlapping portion is laser welded.

[0061] Therefore, if Figure 5 As shown, the portion surrounded by the first reinforcing member 5 to the fourth reinforcing member 11 and the panel member 3 has a closed cross-sectional shape. Furthermore, the portion surrounded by the first reinforcing member 5 to the fourth reinforcing member 11 and the panel member 3 is a rectangular frame 13 (see FIG. 1 ) made of a pipe (a square pipe in this embodiment). Figure 1 ).

[0062] <2.4 Connection between backrest frame and vehicle>

[0063] like Figure 1 As shown, the back frame 1 is connected to the vehicle body via brackets 15 and 17. The frame portion 13 is provided with a connection portion between the brackets 15 and 17 and the back frame 1.

[0064] In particular, Figure 8 As shown in FIG. 1 , the bolt 19 constituting the connection portion between the bracket 15 and the backrest frame 1 is provided on one side of the intersection Po in the panel member 3 constituting the frame portion 13. In other words, Fig. 9As shown, the bolts 19 are arranged in a region A in the panel member 3 divided by a virtual line that connects a weld line W between the first flange portion 52 and the second flange portions 53 , 54 .

[0065] <3. Features of the backrest frame of this embodiment>

[0066] like Fig. 9 As shown, the first flange portion 52 is welded to the panel component 3 at a portion on at least one side divided by the diagonal center line Lo and at a portion across the diagonal center line Lo, and the second flange portions 53, 54 are welded to the panel component 3 at a portion on one side divided by the diagonal center line Lo and at a portion on the other side.

[0067] The second reinforcing member 7 is welded to the first wall portion 51A of the first reinforcing member 5 on one side of the intersection Po so as to overlap the first wall portion 51A. Thus, the strength of the backrest frame 1 of this embodiment at the intersection Po, i.e., at the corner of the panel member 3, can be effectively improved.

[0068] 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 together in a state of overlapping each other. As a result, the frame portion 13 is formed into a portion having a continuous closed cross-sectional shape. Therefore, the load caused by the external force can be effectively transmitted to the entire frame portion 13, and the stress concentration on a part of the backrest frame 1 can be suppressed.

[0069] Furthermore, in the present 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 all the same as the connection structure between the first reinforcing member 5 and the second reinforcing member 7. Therefore, the backrest frame 1 of the present embodiment can reliably improve strength.

[0070] (Other implementations).

[0071] In the above-mentioned embodiment, the joining is achieved by laser welding. However, the present disclosure is not limited thereto. That is, for example, the present disclosure may be configured such that the joining is performed by adhesive, or by welding other than laser welding such as electric welding.

[0072] In the above embodiment, the bolt 19 constituting the connection portion between the bracket 15 and the back frame 1 is connected to the panel member 3. However, the present disclosure is not limited thereto. That is, the present disclosure may be configured such that the bolt 19 is connected to the first reinforcement member 5 or the second reinforcement member 7, for example.

[0073] Similar to the first reinforcing member 5, the main body of the second reinforcing member 7 to the fourth reinforcing member 11 in the above embodiment is also formed in a C-shape or However, the present disclosure is not limited thereto. That is, the present disclosure may also be configured such that the second reinforcing member 7 to the fourth reinforcing member 11 are formed in, for example, an L-shape.

[0074] The frame portion 13 in the above embodiment has a rectangular closed cross-sectional shape. However, the present disclosure is not limited thereto. That is, the present disclosure may also be configured such that the frame portion 13 has an elliptical or circular closed cross-sectional shape, for example.

[0075] In the above embodiment, the bolt 19 constituting the connection portion between the bracket 15 and the backrest frame 1 is connected to the panel member 3 constituting the frame 13. However, the present disclosure is not limited thereto. That is, the present disclosure may be configured such that the bolt 19 is connected to, for example, the first reinforcement member 5 or the second reinforcement member 7.

[0076] In the above embodiment, the first reinforcing member 5 is arranged on the first side 31 side, and the second reinforcing member 7 is arranged on the second side 32 side. However, the present disclosure is not limited thereto. That is, the present disclosure may be configured such that, for example, the second reinforcing member 7 is arranged on the first side 31 side, and the first reinforcing member 5 is arranged on the second side 32 side.

[0077] In the above-mentioned embodiment, the vehicle seat involved in 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 present disclosure can also be applied to seats used in vehicles such as railway vehicles, ships, and aircraft, as well as fixed seats used in theaters or homes.

[0078] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it complies with the disclosure of the above-mentioned embodiments. Therefore, the present disclosure may be, for example, a configuration that combines at least two of the above-mentioned multiple embodiments, or may be a configuration that abolishes any of the illustrated constituent elements or constituent elements that are described by marking symbols in the above-mentioned embodiments.

Claims

1. A vehicle seat back frame, which is a back frame applied to a seat back of a vehicle seat, wherein the vehicle seat back frame is characterized by comprising: a panel member made of metal and formed into a substantially rectangular plate shape; a first reinforcing member fixed to a first side of the panel member and extending along the first side, the first reinforcing member being made of metal; and a second reinforcing member, the second reinforcing member being fixed to the second side of the panel member orthogonal to the first side and extending along the second side, the second reinforcing member being made of metal, and The first reinforcing member comprises: a first wall portion, the first wall portion being opposed to the panel member via a gap; a second wall portion extending from an end portion of the first wall portion located on the face center side of the panel member toward the panel member; a third wall portion extending from an end portion of the first wall portion located on the opposite side of the second wall portion toward the panel member; a first flange portion extending from a front end of the second wall portion in an extending direction in a direction intersecting the extending direction, and at least a portion of the first flange portion being joined to the panel member; as well as a second flange portion, the second flange portion extending from a front end of the third wall portion in the extending direction in a direction intersecting the extending direction, and at least a portion of the second flange portion being joined to the panel member, When a diagonal line of the panel member passing through a virtual intersection of the first side and the second side is taken as a diagonal center line, The first flange portion is joined to the panel member at at least one of a portion on at least one side divided by the diagonal center line and a portion straddling the diagonal center line. The second flange portion is joined to the panel member at a portion on one side and a portion on the other side divided by the diagonal center line. Furthermore, the second reinforcing member is joined to the first wall portion on one side of the intersection so as to overlap with the first wall portion.

2. The vehicle seat backrest frame according to claim 1, characterized in that: The second reinforcement member comprises: a first wall portion, the first wall portion being opposed to the panel member via a gap; a second wall portion extending from an end portion of the first wall portion located on the face center side of the panel member toward the panel member; a third wall portion extending from an end portion of the first wall portion located on the opposite side of the second wall portion toward the panel member; a first flange portion extending from a front end of the second wall portion in the extending direction in a direction intersecting the extending direction, and at least a portion of the first flange portion being joined to the panel member; as well as a second flange portion, the second flange portion extending from a front end of the third wall portion in the extending direction in a direction intersecting the extending direction, and at least a portion of the second flange portion being joined to the panel member, and The first wall portion of the first reinforcing member and the first wall portion of the second reinforcing member are joined in a state of overlapping each other.

3. The vehicle seat backrest frame according to claim 2, characterized in that: When a portion having a closed cross-sectional shape formed by at least one of the first reinforcing member and the second reinforcing member and the panel member is used as the frame portion, The frame portion is provided with a connecting portion for connecting to a bracket fixed to a vehicle.

4. The vehicle seat backrest frame according to claim 3, characterized in that: The connecting portion is provided on one side of the intersection among the panel members constituting the frame portion.

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