Seat frame

Abstract

To provide a seat frame which can achieve strength against a shearing load and strength against a peeling load.SOLUTION: A seat frame according to the invention is formed by joining a plate-like member and a rod-like member having a plane part on a side surface of at least a part thereof to each other. The seat frame is joined by a welding part including: a base part which extends in a longitudinal direction of the rod-like member and in which a center line is located at the side, to which a load from a user is applied when the seat frame is used, relative to a center part as seen in a direction orthogonal to the longitudinal direction of the rod-like member on a contact surface between the plate-like member and the plane part; a first extending part extending from one end of the base part to the side opposite to the side to which the load is applied relative to a center axis of the rod-like member in a direction intersecting with the longitudinal direction of the rod-like member; and a second extending part extending from the other end of the base part to the side opposite to the side to which the load is applied relative to the center axis of the rod-like member in the direction intersecting with the longitudinal direction of the rod-like member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a seat frame. [Background technology]

[0002] Conventionally, automobile seat frames have been made by welding pipes to plate material to ensure the strength of the seat frame (see, for example, Patent Document 1). In Patent Document 1, a seat frame is produced by joining a square pipe, whose cross section taken along a plane perpendicular to the longitudinal direction of the pipe, and a round pipe, whose cross section is circular, to a plate material. In general, the pipe and plate material are joined at the center of the pipe, for example, at the radial center of the cross section in the case of a circular pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-236191 Summary of the Invention [Problem to be solved by the invention]

[0004] When the above-described seat frame is in use, shear loads and peel loads are applied to the plate material and the pipe, and the seat frame is required to have both strength against shear and strength against peel.

[0005] The present invention has been made in view of the above, and has an object to provide a seat frame that can satisfy both strength against shear load and strength against peeling load. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the seat frame of the present invention is a seat frame formed by joining a plate-shaped member and a rod-shaped member having a flat portion on at least some of its side surfaces, and is characterized in that the joining is performed by a weld having a base portion extending in the longitudinal direction of the rod-shaped member, the center line of which is located on the side where a load from a user is applied when the seat frame is in use, rather than the center portion in a direction perpendicular to the longitudinal direction of the rod-shaped member, at the contact surface between the plate-shaped member and the flat portion.

[0007] Furthermore, the seat frame of the present invention is characterized in that, in the above invention, the welded portion is provided on the opposite side from the outer edge side of the plate-shaped member than the center portion in a direction perpendicular to the longitudinal direction of the rod-shaped member.

[0008] Furthermore, the seat frame of the present invention is characterized in that, in the above invention, the welded portion has a first extension portion extending from one end of the base portion in a direction intersecting the longitudinal direction of the rod-shaped member, and a second extension portion extending from the other end of the base portion in a direction intersecting the longitudinal direction of the rod-shaped member.

[0009] Furthermore, the seat frame of the present invention is characterized in that, in the above invention, the welded portion further has a third extension portion extending in the longitudinal direction of the rod-shaped member from the end of the first extension portion opposite the side connected to the base portion, and a fourth extension portion extending in the longitudinal direction of the rod-shaped member from the end of the second extension portion opposite the side connected to the base portion.

[0010] Furthermore, in the seat frame according to the present invention, the first and second extending portions extend linearly.

[0011] Furthermore, in the seat frame according to the present invention, the first and second extending portions extend in an arc shape.

[0012] In addition, the seat frame of the present invention is characterized in that, in the above invention, the welded portion further has a connecting portion that connects the end of the first extension portion opposite the side connected to the base portion and the end of the second extension portion opposite the side connected to the base portion.

[0013] Furthermore, in the seat frame according to the present invention, the rod-shaped member has a rectangular cross section cut along a plane perpendicular to the longitudinal direction.

[0014] Furthermore, in the seat frame according to the present invention, the rod-shaped member is cylindrical.

[0015] In addition, in the seat frame according to the present invention, the plate-shaped members and the rod-shaped members are each made of aluminum or an aluminum alloy. [Effects of the Invention]

[0016] According to the present invention, it is possible to obtain an effect of achieving both strength against shear load and strength against peel load. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a front view of a seat frame for an automobile according to one embodiment of the present invention. [Figure 2] FIG. 2 is a rear view of the automobile seat frame of FIG. [Figure 3] FIG. 3 is an enlarged view of a region R shown in FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a part of FIG. 3 taken along line AA. [Figure 5] FIG. 5 is a diagram for explaining a joining mode of an automobile seat frame according to the first modification. [Figure 6] FIG. 6 is a diagram for explaining a joining mode of an automobile seat frame according to the second modification. [Figure 7]FIG. 7 is a diagram for explaining a joining mode of an automobile seat frame according to the third modification. [Figure 8] FIG. 8 is a diagram for explaining a joining mode of an automobile seat frame according to the fourth modification. [Figure 9] FIG. 9 is a diagram illustrating a joining mode of an automobile seat frame according to the fifth modification. [Figure 10] FIG. 10 is a diagram for explaining a joining mode of an automobile seat frame according to the sixth modification. [Figure 11] FIG. 11 is a diagram for explaining a joining mode of an automobile seat frame according to the seventh modification. [Figure 12] FIG. 12 is a diagram for explaining the welding position according to the embodiment of the present invention. [Figure 13] FIG. 13 is a diagram showing the rate of change in shear strength and peel strength in Examples 2 and 3 and Comparative Examples 1 and 2 relative to Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Furthermore, the drawings referred to in the following description merely show the shape, size, and positional relationship of the components to the extent that the contents of the present invention can be understood. In other words, the present invention is not limited to only the shape, size, and positional relationship exemplified in each drawing.

[0019] (Embodiment) First, a seat frame for an automobile according to an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a front view of the seat frame for an automobile according to an embodiment of the present invention. Fig. 2 is a rear view of the seat frame for an automobile shown in Fig. 1. Fig. 3 is an enlarged view of region R shown in Fig. 2. Fig. 4 is an enlarged cross-sectional view of a portion taken along line AA in Fig. 3.

[0020] A seat frame 1 for an automobile (hereinafter simply referred to as seat frame 1) comprises a back panel 2 made of aluminum or an aluminum alloy, and a frame tube 3 made of aluminum or an aluminum alloy. In the seat frame 1, the frame tube 3 is fixed to the back panel 2 by joining the back panel 2 and the frame tube 3.

[0021] The back panel 2 is a thin plate of aluminum or an aluminum alloy, and is formed by press working, etc. The aluminum alloy used for the back panel 2 is preferably one with high strength, but from the viewpoint of ease of forming, for example, 5000 series (Al-Mg series) and 6000 series (Al-Mg-Si series) are mentioned.

[0022] The frame tube 3 is a pipe made of aluminum or an aluminum alloy and has a rectangular cross section (see FIG. 4). Because the frame tube 3 has a rectangular cross section, it has flat portions on part of its surface. Specifically, the outer edge of the cross section of the frame tube 3 has four flat portions and four corners arranged alternately. The corners are chamfered to form an arc shape. The frame tube 3 is joined with the flat portions in contact with the back panel 2. The aluminum alloy used for the frame tube 3 is preferably one with high strength, such as 2000 series (Al-Cu-Mg series), 5000 series, 6000 series, and 7000 series (Al-Zn-Mg series). The frame tube 3 may have a polygonal cross section other than a rectangle. The frame tube 3 may be a cylindrical member or a solid member. The back panel 2 and the frame tube 3 are not limited to being made of aluminum or aluminum alloy, but may be made of other metals such as iron or alloys.

[0023] The back panel 2 and the frame pipe 3 are joined by a weld 4. The weld 4 is linear and extends in the longitudinal direction of the frame pipe 3. The weld 4 is formed, for example, by laser welding. The back panel 2, the frame pipe 3, and the weld 4 form a joined body. The weld 4 may be formed by forming a single line of linear weld marks, or may be formed by arranging multiple lines (for example, three lines) of weld marks in a direction perpendicular to the longitudinal direction of the frame pipe 3.

[0024] In this embodiment, among the directions perpendicular to the longitudinal direction of the frame pipe 3, the direction extending along the surface of the frame pipe 3 that contacts the back panel 2 is defined as the width direction of the frame pipe 3. In contrast, the direction extending upright relative to the back panel 2 is defined as the thickness direction of the frame pipe 3. The longitudinal direction corresponds to the direction perpendicular to the cross section described above, and in the case of a pipe shape, it is the direction in which the hollow space extends.

[0025] Next, the joining mode between the back panel 2 and the frame pipe 3 will be described. A seat frame 1, which is made by joining a back panel 2 and a frame tube 3, is subjected to a load during use. Specifically, the load is applied to the seat frame 1 when an occupant leans against the seat or when the seat receives an impact from the luggage compartment. When an impact is received from the luggage compartment, a shear load F1 is applied between the back panel 2 and the frame tube 3. Furthermore, when an occupant leans against the seat, a peel load F2 is applied between the back panel 2 and the frame tube 3. The shear load F1 and the peel load F2 act in different directions on the back panel 2 and the frame tube 3. Specifically, the shear load F1 is a load that is applied in a direction that shifts the joint position between the back panel 2 and the frame tube 3. In contrast, the peel load F2 is a load that is applied in a direction that moves the back panel 2 and the frame tube 3 away from each other.

[0026] The joining position between the back panel 2 and the frame pipe 3 in the seat frame 1 is determined depending on the position of the frame pipe 3 relative to the back panel 2. Specifically, the back panel 2 and the frame pipe 3 are joined on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3 in the width direction. Here, the inner side of the back panel 2 refers to the side facing the opposite outer edge of the connecting surface of the back panel 2 to the frame pipe 3, and is the side to which a load is applied. In other words, when a load is applied to the back panel 2 by a passenger seated in the seat, the inner side of the load refers to the side of the back panel 2 closer to the point of application of the load, with the central axis N of the frame pipe 3 as the boundary. Conversely, the side opposite the point of application of the load, with the central axis N of the frame pipe 3 as the boundary, is the outer side of the load. Note that the weld 4 is formed in the area where the back panel 2 and the flat portion of the frame pipe 3 contact each other (for example, area d shown in FIG. 4 ). Furthermore, in Figure 3, the weld 4 is illustrated as being located on the load inner side of the central axis N of the frame pipe 3, but it is sufficient that the center line L of the weld 4 is located on the load inner side of the central axis N of the frame pipe 3, and a portion of the weld may overlap with the central axis N.

[0027] In the embodiment described above, the seat frame 1 is fabricated by joining the back panel 2 and the frame tube 3, each made of aluminum or aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame tube 3. According to this embodiment, by forming the weld 4 at a position that satisfies the above-mentioned relationship, it is possible to increase strength against shear and peeling, and as a result, it is possible to firmly join the plate-shaped member and the pipe-shaped member. Furthermore, by making the back panel 2 and the frame tube 3 out of aluminum or aluminum alloy, it is possible to reduce the weight compared to steel.

[0028] 2 has been described as being formed by linearly laser welding at multiple points, but the invention is not limited to this and may be formed by, for example, single-point welding. Furthermore, the joining of the back panel 2 and the frame pipe 3 is not limited to being linear as long as the joining is on the inside of the load-bearing member. Other aspects of the weld will be described below.

[0029] (Variation 1) 5 is a diagram illustrating a joining aspect of an automobile seat frame according to Modification 1. The seat frame according to Modification 1 is provided with a welded portion 4A instead of the above-described welded portion 4. Hereinafter, a description of the same configuration as in the above-described embodiment (the back panel 2 and the frame pipe 3) will be omitted.

[0030] The welded portion 4A is provided on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, and has a linear base portion 41 extending in the longitudinal direction of the frame pipe 3, a first extending portion 42 extending in a linear shape from one end of the base portion 41 toward the outer side of the back panel 2, and a second extending portion 43 extending in a linear shape from the other end of the base portion 41 toward the outer side of the back panel 2. Both the first extending portion 42 and the second extending portion 43 extend to the outer side of the central axis N of the frame pipe 3.

[0031] In the above-described first modification, the back panel 2 and the frame pipe 3 are joined by a weld 4A. As in the embodiment, the base portion 41 at the weld 4A joins the back panel 2 and the frame pipe 3, each made of aluminum or an aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, thereby producing a seat frame. According to the first modification, by forming the weld 4A at a position that satisfies the above-described relationship, it is possible to increase strength against shear and peeling, and as a result, it is possible to firmly join a plate-shaped member and a pipe-shaped member.

[0032] Furthermore, in the first modification, the first extension portion 42 and the second extension portion 43 that extend in the direction in which the shear load is applied are provided, thereby making it possible to further increase the strength against shear.

[0033] (Variation 2) 6 is a diagram illustrating a joining aspect of an automobile seat frame according to Modification 2. The seat frame according to Modification 2 is provided with a welded portion 4B instead of the above-described welded portion 4. Hereinafter, a description of the same configuration as in the above-described embodiment (the back panel 2 and the frame pipe 3) will be omitted.

[0034] Like welded portion 4A, welded portion 4B has a base portion 41, a first extension portion 42, and a second extension portion 43, and also has a third extension portion 44 extending in the longitudinal direction of frame pipe 3 from the end of first extension portion 42 opposite to the side where it connects to base portion 41, and a fourth extension portion 45 extending in the longitudinal direction of frame pipe 3 from the end of second extension portion 43 opposite to the side where it connects to base portion 41.

[0035] In the above-described second modification, the back panel 2 and the frame pipe 3 are joined by a weld 4B. As in the embodiment, the base portion 41 at the weld 4B joins the back panel 2 and the frame pipe 3, each made of aluminum or an aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, thereby producing a seat frame. According to the second modification, by forming the weld 4B at a position that satisfies the above-described relationship, it is possible to increase strength against shear and peeling, and as a result, it is possible to firmly join a plate-shaped member and a pipe-shaped member.

[0036] Furthermore, in variant example 2, by providing a first extension portion 42 and a second extension portion 43 that extend in the direction in which the shear load is applied, the strength against shear can be further increased, and by providing a third extension portion 44 and a fourth extension portion 45 that extend in the direction in which the peel load is applied, the strength against peel can be further increased.

[0037] In addition, in the second variant example, the third extension portion 44 and the fourth extension portion 45 are described as extending in directions toward each other, but the third extension portion 44 and the fourth extension portion 45 may also be configured as extending in directions away from each other.

[0038] (Variation 3) 7 is a diagram illustrating a joining aspect of an automobile seat frame according to Modification 3. The seat frame according to Modification 3 is provided with a welded portion 4C instead of the above-described welded portion 4. Hereinafter, a description of the same configuration as in the above-described embodiment (the back panel 2 and the frame pipe 3) will be omitted.

[0039] Similar to welded portion 4A, welded portion 4C has a base portion 41, a first extending portion 42, and a second extending portion 43, and also has a connecting portion 46 that connects the end of first extending portion 42 opposite to the side where it is connected to base portion 41, and the end of second extending portion 43 opposite to the side where it is connected to base portion 41. Welded portion 4C is rectangular and joins back panel 2 and frame pipe 3 together.

[0040] In the third modification described above, the back panel 2 and the frame pipe 3 are joined by a weld 4C. As in the embodiment, the base portion 41 at the weld 4C joins the back panel 2 and the frame pipe 3, each made of aluminum or an aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, thereby producing a seat frame. According to the third modification, by forming the weld 4C at a position that satisfies the above-described relationship, it is possible to increase strength against shear and peeling, and as a result, it is possible to firmly join a plate-shaped member and a pipe-shaped member.

[0041] Furthermore, in variant example 3, by providing a first extension portion 42 and a second extension portion 43 that extend in the direction in which the shear load is applied, the strength against shear can be further increased, and further by providing a connecting portion 46 that extends in the direction in which the peel load is applied, the strength against peel can be further increased.

[0042] (Variation 4) 8 is a diagram illustrating a joining aspect of an automobile seat frame according to Modification 4. The seat frame according to Modification 4 is provided with a welded portion 4D instead of the above-described welded portion 4. Hereinafter, a description of the same configuration as in the above-described embodiment (the back panel 2 and the frame pipe 3) will be omitted.

[0043] The welded portion 4D has a base portion 41 similar to the welded portion 4A, a first extending portion 47 extending in an arc from one end of the base portion 41 toward the outside of the back panel 2, and a second extending portion 48 extending in an arc from the other end of the base portion 41 toward the outside of the back panel 2. Both the first extending portion 47 and the second extending portion 48 extend further outward than the central axis N of the frame pipe 3.

[0044] In the fourth modification described above, the back panel 2 and the frame pipe 3 are joined by a weld 4D. As in the embodiment, the base portion 41 at the weld 4D joins the back panel 2 and the frame pipe 3, each made of aluminum or an aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, thereby producing a seat frame. According to the fourth modification, by forming the weld 4D at a position that satisfies the above-described relationship, it is possible to increase the strength against shear and peeling, thereby firmly joining the plate-like member and the pipe-like member and reducing the weight.

[0045] Furthermore, in the fourth modification, the first extension portion 47 and the second extension portion 48 that extend in an arc shape are provided, thereby further increasing the strength against shear and peeling.

[0046] (Variation 5) 9 is a diagram illustrating a joining aspect of an automobile seat frame according to Modification 5. The seat frame according to Modification 5 is provided with a welded portion 4E instead of the above-described welded portion 4. Hereinafter, a description of the same configuration as in the above-described embodiment (the back panel 2 and the frame pipe 3) will be omitted.

[0047] Similar to welded portion 4D, welded portion 4E has a base portion 41, a first extending portion 47, and a second extending portion 48, and also has a connecting portion 49 that connects the end of first extending portion 47 opposite to the side where it is connected to base portion 41, and the end of second extending portion 48 opposite to the side where it is connected to base portion 41. Welded portion 4E has a generally elliptical shape and joins back panel 2 and frame pipe 3 together.

[0048] In the fifth modification described above, the back panel 2 and the frame pipe 3 are joined by a weld 4E. As in the embodiment, the base portion 41 at the weld 4E joins the back panel 2 and the frame pipe 3, each made of aluminum or an aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, thereby producing a seat frame. According to the fifth modification, by forming the weld 4E at a position that satisfies the above-described relationship, it is possible to increase strength against shear and peeling, and as a result, it is possible to firmly join a plate-shaped member and a pipe-shaped member.

[0049] Furthermore, in the fifth modification, by providing the first extending portion 47, the second extending portion 48, and the connecting portion 49, it is possible to further increase the strength against shear and peeling.

[0050] (Variation 6) 10 is a diagram illustrating a joining aspect of an automobile seat frame according to Modification 6. The seat frame according to Modification 6 is provided with a welded portion 4F instead of the above-described welded portion 4. Hereinafter, a description of the same configuration as in the above-described embodiment (the back panel 2 and the frame pipe 3) will be omitted.

[0051] The welded portion 4F has the above-mentioned base portion 41 and an extension portion 50 extending from the longitudinal center portion of the base portion 41. The welded portion 4F joins the back panel 2 and the frame pipe 3 in a T-shape.

[0052] In the sixth modification described above, the back panel 2 and the frame pipe 3 are joined by a weld 4F. As in the embodiment, the base portion 41 at the weld 4F joins the back panel 2 and the frame pipe 3, each made of aluminum or an aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, thereby producing a seat frame. According to the sixth modification, by forming the weld 4F at a position that satisfies the above-described relationship, it is possible to increase strength against shear and peeling, and as a result, it is possible to firmly join a plate-shaped member and a pipe-shaped member.

[0053] Furthermore, in the sixth modification, by providing the extension portion 50 that extends in the direction in which the shear load is applied, it is possible to further increase the strength against shear.

[0054] (Variation 7) 11 is a diagram illustrating a joining aspect of an automobile seat frame according to Modification 7. The seat frame according to Modification 7 is provided with a welded portion 4G instead of the above-described welded portion 4. Hereinafter, a description of the same configuration as in the above-described embodiment (the back panel 2 and the frame pipe 3) will be omitted.

[0055] The welded portion 4G has a base portion 51 extending in the longitudinal direction of the frame pipe 3, and an extension portion 52 extending through the longitudinal center of the base portion 51. The welded portion 4G forms a plus (+) shape and joins the back panel 2 and the frame pipe 3 together.

[0056] In the seventh modification described above, the back panel 2 and the frame pipe 3 are joined by a weld 4G. As in the embodiment, the base portion 51 at the weld 4G joins the back panel 2 and the frame pipe 3, each made of aluminum or an aluminum alloy, on the inner side of the back panel 2 relative to the central axis N of the frame pipe 3, thereby producing a seat frame. According to the seventh modification, by forming the weld 4G at a position that satisfies the above-described relationship, it is possible to increase strength against shear and peeling, and as a result, it is possible to firmly join a plate-shaped member and a pipe-shaped member.

[0057] Furthermore, in the seventh modification, by providing the extension portion 52 that extends in the direction in which the shear load is applied, it is possible to further increase the strength against shear.

[0058] The welded portion is not limited to the T-shape and +-shape described above, but may be an H-shape or the like.

[0059] In this way, the present invention can include various embodiments not described here, and various design changes can be made within the scope that does not deviate from the technical idea specified by the claims. [Example]

[0060] Hereinafter, examples of the seat frame for an automobile according to the present invention will be described, but the present invention is not limited to these examples.

[0061] In the examples, for the joined bodies of aluminum alloy back panels and frame pipes for strength measurement, joined bodies were prepared by changing the joining position (position of the weld) relative to the frame pipe, and the shear strength and peel strength of each joined body were measured. Note that the materials and shapes of the back panels and frame pipes used in each example, the welding conditions (beam pattern, output, irradiation time, etc.), and the shape of the welds were the same. In this example, the joined bodies for measurement were prepared using back panels made of 5000 series aluminum alloys and frame pipes made of 7000 series aluminum alloys.

[0062] 12 is a diagram for explaining the welding position according to an embodiment of the present invention. In the width direction of the frame pipe 300, the position where the central axis N passes is defined as zero. In addition, in the width direction, the inside of the load is defined as the positive direction, and the outside of the load is defined as the negative direction.

[0063] Example 1 The welded portion was formed at the zero position (on the central axis N) in the width direction of the frame pipe 300 when viewed from the thickness direction of the frame pipe 300. In this Example 1, the shear strength and peel strength were measured.

[0064] Example 2 The width of the frame pipe 300 was defined as W (see FIG. 4), and the weld was formed at a position shifted by W / 8 in the positive width direction from the zero position. In Example 2, the shear strength and peel strength were measured, and the change in strength relative to Example 1 was calculated. The calculation results are shown in Table 1. [Table 1]

[0065] Example 3 The weld was formed at a position shifted by W / 4 in the positive width direction from the zero position. In Example 2, the shear strength and peel strength were measured, and the change in strength compared to Example 1 was calculated.

[0066] (Comparative Example 1) The weld was formed at a position shifted by W / 8 in the negative width direction from the zero position. In this Comparative Example 1, the shear strength and peel strength were measured, and the change rate of the strength compared to Example 1 was calculated.

[0067] (Comparative Example 2) The weld 4 was formed at a position shifted by W / 4 in the negative width direction from the zero position. In this Comparative Example 1, the shear strength and peel strength were measured, and the change rate of the strength compared to Example 1 was calculated.

[0068] FIG. 13 is a diagram showing the change rates of shear strength and peel strength in Examples 2 and 3 and Comparative Examples 1 and 2 relative to Example 1. It can be seen that the shear and peel strengths of the joined bodies of Examples 2 and 3 are both increased compared to Example 1, in which the weld was formed on the central axis N. On the other hand, the shear and peel strengths of the joined bodies of Comparative Examples 1 and 2 are both decreased compared to Example 1. From these results, it can be said that by providing the weld 4 on the inside of the load, the strength against shear and peel can be increased compared to when the weld is formed on the central axis N.

[0069] As described above, the joined body and the automobile seat frame according to the present invention are suitable for achieving both strength against shear load and strength against peel load. [Explanation of symbols]

[0070] 1. Automobile seat frames 2 Back Panel 3 Frame tube 4, 4A~4F Welded parts 41 Base 42, 47 1st extension part 43, 48 2nd extension part 44 Third extension part 45 4th extension part 46, 49 Connection part 50 Extension

Claims

1. A seat frame formed by joining a plate-shaped member and a rod-shaped member having a flat surface on at least a part of a side surface, a base portion extending in a longitudinal direction of the rod-shaped member, the center line of which is located on a side of a contact surface between the plate-shaped member and the flat portion where a load from a user is applied when the seat frame is in use, relative to a center portion in a direction perpendicular to the longitudinal direction of the rod-shaped member; a first extension portion extending from one end of the base portion in a direction intersecting the longitudinal direction of the rod-shaped member to a side opposite to the side to which the load is applied relative to a central axis of the rod-shaped member; a second extension portion extending from the other end of the base portion in a direction intersecting the longitudinal direction of the rod-shaped member to a side opposite to the side to which the load is applied relative to a central axis of the rod-shaped member; and joined by a weld having a A seat frame characterized by:

2. The welded portion is provided on the opposite side of the outer edge side of the plate-shaped member from the center portion of the rod-shaped member in a direction perpendicular to the longitudinal direction of the rod-shaped member.

2. The seat frame according to claim 1.

3. The welded portion is a third extension portion extending in a longitudinal direction of the rod-shaped member from an end of the first extension portion opposite to the end connected to the base portion; a fourth extension portion extending in a longitudinal direction of the rod-shaped member from an end of the second extension portion opposite to the end connected to the base portion; 2. The seat frame of claim 1, further comprising:

4. The first and second extension portions extend linearly.

2. The seat frame according to claim 1.

5. The first and second extension portions extend in an arcuate shape.

2. The seat frame according to claim 1.

6. The welded portion is a connecting portion connecting an end portion of the first extension portion opposite to the side connected to the base portion and an end portion of the second extension portion opposite to the side connected to the base portion; 2. The seat frame of claim 1, further comprising:

7. The rod-shaped member has a rectangular cross section taken along a plane perpendicular to the longitudinal direction.

7. The seat frame according to claim 1, wherein the seat frame is made of a resin.

8. The rod-shaped member is cylindrical.

8. The seat frame according to claim 1, wherein the seat frame is made of a resin.

9. the plate-shaped member and the rod-shaped member are each made of aluminum or an aluminum alloy; 9. The seat frame according to claim 1, wherein the seat frame is made of a resin.

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