Seat frame and manufacturing method thereof

Abstract

To provide a seat frame that can reduce the number of components while highly precisely assembling a frame and a pipe and, moreover, can be assembled efficiently and to provide a manufacturing method therefor.SOLUTION: A target fitting portion 115, having a shape corresponding to the outer shape of a pipe 20, is provided in a part of a second wall portion 111 of a portion defining a second cutout portion 112. The pipe 20 is inserted into both a first cutout portion 102 and the second cutout portion 112 and is fitted to the target fitting portion 115. By providing a first weld portion 131 between the pipe 20 and a first wall portion 101, the pipe 20 is welded directly to the first wall portion 101 via the first weld portion 131. In the target fitting portion 115 and / or in the vicinity thereof, a second weld portion 132 is provided between the pipe 20 and the second wall portion 111, so that the pipe 20 is welded directly to the second wall portion 111 via the second weld portion 132.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a seat frame and a manufacturing method thereof, and more particularly to a seat frame for a vehicle seat to be installed in an automobile or the like, and a manufacturing method thereof. [Background technology]

[0002] JP 2013-121772 A (Patent Document 1) is a document disclosing the configuration of a seat frame. The seat frame structure described in Patent Document 1 includes a side frame, a rod member, and an outer tube member. The outer tube member is interposed between the side frame and the rod member inserted into a through hole provided in the side frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-121772 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the seat frame described in Patent Document 1, bushes are provided for the purpose of reinforcing the pipes so as not to reduce their strength when the pipes are fixed to the frame. However, even if the purpose is not reinforcement, it is expected that bushes will be interposed between the frame and the pipes in order to assemble and fix the frame and the pipes.

[0005] Using bushes increases the number of parts, so it is desirable not to use bushes in order to reduce material costs. However, if bushes are not used, the pipes cannot be inserted into the frame if the fixing positions of the frame and pipes do not match, making it difficult to assemble the frame and pipes with high precision.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a seat frame and a manufacturing method thereof that can reduce the number of parts while assembling the frame and pipes with high precision, and that can be assembled efficiently. [Means for solving the problem]

[0007] A seat frame according to the present disclosure forms a framework of a vehicle seat. The seat frame includes a frame and a pipe. The frame includes a first wall portion and a second wall portion opposed to each other. The pipe is fixed to the frame. A first cutout portion having a hole shape is provided in the first wall portion. A second cutout portion having a hole shape or a notch shape is provided in the second wall portion. Each of the first cutout portion and the second cutout portion is formed larger than the pipe so that the pipe can be inserted therein. The first cutout portion has a size and shape that allows the pipe to be directly welded to the first wall portion in a state in which the pipe is disposed in any position of the first cutout portion. A portion of the second wall portion that defines the second cutout portion is provided with an addressable portion having a shape corresponding to the outer shape of the pipe. The pipe is inserted into both the first cutout portion and the second cutout portion and is assigned to the addressable portion. A first welded portion is provided between the pipe and the first wall portion, so that the pipe is directly welded to the first wall portion via the first welded portion. A second welded portion is provided between the pipe and the second wall portion at and / or near the mated portion, so that the pipe is directly welded to the second wall portion via the second welded portion.

[0008] With this configuration, the first cut-out portion is formed to a size that allows the pipe to be directly welded, and the second cut-out portion allows the pipe to be directly welded by allocating it to the addressed portion, so that the frame and the pipe can be assembled with a reduced number of parts without using bushes. Furthermore, even if the positions of the first cut-out portion and the second cut-out portion do not match in the direction intersecting the extension direction of the pipe, the pipe can be adjusted to a position where welding is possible by allocating the pipe to the addressed portion, so assembly can be performed with high precision and efficiency.

[0009] In one embodiment of the present disclosure, the frame is composed of a pair of plate-like members that are aligned in the extension direction of the pipe and combined with each other to form an integrated unit. The first wall portion is included in the first plate-like member, which is one of the pair of plate-like members. The second wall portion is included in the second plate-like member, which is the other of the pair of plate-like members.

[0010] Even in the case where the frame is thus constituted by a pair of plate-like members having a first wall portion and a second wall portion, the above-described welded structure of the pipe to the frame can be applied.

[0011] In one embodiment of the present disclosure, the first plate-shaped member has a first standing wall portion erected from each of a pair of ends of the first wall portion located in a direction intersecting the extension direction of the pipe toward the second wall portion. The second plate-shaped member has a second standing wall portion erected from each of a pair of ends of the second wall portion located in a direction intersecting the extension direction of the pipe toward the first wall portion. The corresponding first standing wall portion and second standing wall portion are welded in a state where they are overlapped or butted against each other.

[0012] By configuring in this manner, the above-mentioned welding structure of the pipe to the frame can be applied even when the frame is constructed by combining a first plate-shaped member having a first vertical wall portion and a second plate-shaped member having a second vertical wall portion.

[0013] In another embodiment of the present disclosure, the frame is formed of a single plate-like member including the first wall portion and the second wall portion.

[0014] Even in the case where the frame is thus constituted by a single plate-like member having a first wall portion and a second wall portion, the above-described welded structure of the pipe to the frame can be applied.

[0015] In another embodiment of the present disclosure, the plate-like member has a connection portion, a first standing wall portion, and a second standing wall portion. The connection portion connects one of a pair of ends of the first wall portion located in a direction intersecting with the extension direction of the pipe to one of a pair of ends of the second wall portion located in a direction intersecting with the extension direction of the pipe. The first standing wall portion stands from the other of the pair of ends of the first wall portion located in a direction intersecting with the extension direction of the pipe toward the second wall portion. The second standing wall portion stands from the other of the pair of ends of the second wall portion located in a direction intersecting with the extension direction of the pipe toward the first wall portion. The first standing wall portion and the second standing wall portion are welded in a state where they are overlapped or butted against each other.

[0016] With this configuration, the above-described welding structure of the pipe to the frame can be applied even when the frame is formed of a single plate-like member having the first standing wall portion and the second standing wall portion.

[0017] In one embodiment of the present disclosure, the second missing portion includes a surplus missing region that is located on the opposite side of the addressed portion as seen from the pipe when the pipe is assigned to the addressed portion. The surplus missing region has a size and shape that allows the pipe to be assigned to the addressed portion by moving the pipe in a direction intersecting the extension direction of the pipe, regardless of where the pipe is positioned in the portion including the surplus missing region.

[0018] By configuring in this manner, it becomes easy to assign the pipe to the target portion by placing the pipe in the surplus missing area and moving the position of the pipe in a direction intersecting the extension direction of the pipe, thereby enabling the frame and pipes to be assembled efficiently.

[0019] A manufacturing method for a seat frame based on the present disclosure is a manufacturing method for a seat frame that forms the skeleton of a vehicle seat and includes a frame including a first wall portion and a second wall portion opposed to each other, and a pipe fixed to the frame, and includes the steps of: providing a first cut-out portion in the first wall portion that is hole-shaped larger than the pipe so that the pipe can be inserted; providing a second cut-out portion in the second wall portion that is hole-shaped or notch-shaped larger than the pipe so that the pipe can be inserted; bringing the first wall portion and the second wall portion into a state where the pipe is inserted into both the first cut-out portion and the second cut-out portion; providing a first weld between the pipe and the first wall portion, thereby directly welding the pipe to the first wall portion via the first weld; and providing a second weld between the pipe and the second wall portion, thereby directly welding the pipe to the second wall portion via the second weld. The first cut-out is formed to a size and shape that allows the pipe to be directly welded to the first wall portion regardless of the position of the first cut-out in the step of providing the first cut-out in the first wall portion. A fitted portion having a shape corresponding to the outer shape of the pipe is provided in a part of the second wall portion that defines the second cut-out in the step of providing the second cut-out in the second wall portion. In the step of directly welding the pipe to the second wall portion via the second weld, a second weld is provided between the pipe and the second wall portion at and / or near the fitted portion while maintaining the state in which the pipe is fitted to the fitted portion.

[0020] By manufacturing the seat frame using this manufacturing method, the first cut-out portion is formed to a size that allows the pipe to be directly welded, and the second cut-out portion allows the pipe to be directly welded by allocating it to the addressed portion, so that the frame and the pipe can be assembled with a reduced number of parts without using bushes. Furthermore, even if the positions of the first cut-out portion and the second cut-out portion do not match in the direction intersecting the extension direction of the pipe, the pipe can be adjusted to a position where welding is possible by allocating it to the addressed portion, so assembly can be performed with high precision and efficiency. Effect of the Invention

[0021] According to the present disclosure, since the pipes can be directly welded to the frame, it is possible to assemble the frame and the pipes with high precision while reducing the number of parts, and furthermore, assembly can be performed efficiently. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a perspective view of a seat frame according to the first embodiment. [Diagram 2] 2 is an enlarged view seen from the direction of arrow II shown in FIG. [Diagram 3] 3 is an enlarged view seen from the direction of arrow III shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. [Diagram 5] 4 is a cross-sectional view taken along the line VV in FIG. 3. [Figure 6] 2 is a partial cross-sectional view of the seat frame according to the first embodiment. FIG. [Figure 7] FIG. 2 is an exploded perspective view of the seat frame according to the first embodiment. [Figure 8] FIG. 4 is a component diagram of a second plate-shaped member according to the first embodiment. [Figure 9] 5 is a flowchart of a method for manufacturing the seat frame according to the first embodiment. [Figure 10] FIG. 4 is a cross-sectional view of a seat frame according to a first modified example. [Figure 11] FIG. 4 is a partial cross-sectional view of a seat frame according to a first modified example. [Figure 12] FIG. 11 is a component diagram of a second plate-shaped member according to a first modified example. [Figure 13] FIG. 11 is a cross-sectional view of a seat frame according to a second modified example. [Figure 14] FIG. 11 is a cross-sectional view of a single plate-shaped member according to the second embodiment. [Figure 15] FIG. 11 is a cross-sectional view of a pipe and a single plate-like member according to the second embodiment. [Figure 16] 10 is a flowchart of a method for manufacturing a seat frame according to the second embodiment. [Figure 17] FIG. 11 is a cross-sectional view of a seat frame according to a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The seat frame according to each embodiment will be described below with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are given the same reference numerals, and the description thereof will not be repeated. In each drawing, in order to facilitate understanding, some of the components of the seat frame are omitted and some are illustrated at different ratios from the actual dimensions.

[0024] (Embodiment 1) The following describes a schematic configuration of the seat frame according to the first embodiment. Fig. 1 is a perspective view of the seat frame according to the first embodiment. The up-down direction in Fig. 1 corresponds to the up-down direction of the seat, the left rear and right front directions correspond to the seat width direction, and the left front and right rear directions correspond to the front-rear direction of the seat. In the front-rear direction of the seat, the direction toward the right rear corresponds to the direction in which the front surface of the seat faces.

[0025] As shown in FIG. 1, a seat frame 1 according to the first embodiment forms the framework of a vehicle seat, and includes a frame 10 and a pipe 20. The seat frame 1 according to the present embodiment further includes an upper pipe 30 and a lower arm 40. Generally, the seat frame 1 includes a seat back frame and a cushion frame. The seat back frame is erected on the cushion frame. Here, the structure of the seat back frame will be described, and a description of the cushion frame will be omitted.

[0026] A pair of frames 10 are provided on the left and right sides in the seat width direction of the seat frame 1. In the frame 10, frame 10L is disposed on the left side in the seat width direction, and frame 10R is disposed on the right side. Each of the frames 10L and 10R extends in the seat up-down direction.

[0027] Pipe 20 is fixed so as to pass through frame 10L and frame 10R. Pipe 20 is made of, for example, a steel pipe. In this embodiment, pipe 20 has a cylindrical cross section, but may have a rectangular or elliptical cross section.

[0028] The upper pipe 30 has a U-shape and is connected to the upper part of each of the frames 10L and 10R. The upper pipe 30 is connected to a headrest (not shown) at a holder 31 provided at the upper part.

[0029] The lower arm 40 is provided at the bottom of each of the frames 10L and 10R. The lower arm 40 is connected to the outer sides of the frames 10L and 10R in the seat width direction via recliners (not shown). The frames 10L and 10R are rotatable relative to the lower arm 40 by the recliners.

[0030] Hereinafter, a description will be given of the structures of the frame 10L and the pipe 20 according to the embodiment 1. Fig. 2 is an enlarged view seen from the direction of the arrow II shown in Fig. 1. Fig. 3 is an enlarged view seen from the direction of the arrow III shown in Fig. 1.

[0031] 2 and 3, the frame 10L is composed of a pair of plate-like members that are aligned in the extension direction of the pipe 20 and combined with each other to form an integrated unit. Specifically, the pair of plate-like members is composed of a first plate-like member 100 and a second plate-like member 110 facing the first plate-like member 100.

[0032] 2, the first plate-shaped member 100 includes a first wall portion 101. The first wall portion 101 has a concave portion 104 around the pipe 20. The first plate-shaped member 100 is formed, for example, from a press-formed product obtained by pressing a metal plate such as a steel plate.

[0033] 3, the second plate-shaped member 110 has a second wall portion 111. The second plate-shaped member 110 is, for example, a press-formed product obtained by pressing a metal plate such as a steel plate.

[0034] With the first plate-shaped member 100 and the second plate-shaped member 110 configured as described above, the frame 10L includes a first wall portion 101 and a second wall portion 111 facing each other.

[0035] The structure of the frame 10L according to the first embodiment will be described below. Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 3. As shown in Fig. 4, the first plate-like member 100 has first standing walls 103 standing from each of a pair of ends of a first wall 101 located in a direction intersecting with the extension direction of the pipe 20 toward the second wall 111.

[0036] The second plate-like member 110 has second upright wall portions 113 extending from each of a pair of ends of a second wall portion 111 located in a direction intersecting the extension direction of the pipe 20 toward the first wall portion 101.

[0037] The corresponding first standing wall portion 103 and second standing wall portion 113 are welded to each other in a superposed state. In this embodiment, the side surface portion 103s of the first standing wall portion 103 and the side surface portion 113s of the second standing wall portion 113 are superposed with the first standing wall portion 103 on the outside. The end portion of the first standing wall portion 103 and the side surface portion 113s are welded to each other at a third welded portion 133.

[0038] The first standing wall portion 103 and the second standing wall portion 113 may be welded with their ends butted together. The connection between the first standing wall portion 103 and the second standing wall portion 113 is not limited to welding, and may be, for example, connection by bolt fastening.

[0039] The structures of the frame 10L and the pipe 20 according to the first embodiment will be described below. Fig. 5 is a cross-sectional view taken from the direction of the VV line arrow in Fig. 3. Fig. 6 is a partial cross-sectional view of the seat frame according to the first embodiment. Fig. 7 is an exploded perspective view of the seat frame according to the first embodiment.

[0040] 5 to 7, the first wall portion 101 is provided with a first cutout portion 102 in the shape of a hole, and the second wall portion 111 is provided with a second cutout portion 112 in the shape of a notch. Each of the first cutout portion 102 and the second cutout portion 112 is formed larger than the pipe 20 so that the pipe 20 can be inserted therein. More specifically, the first cutout portion 102 has a size and shape that allows the pipe 20 to be directly welded to the first wall portion 101 regardless of the position of the first cutout portion 102 in which the pipe 20 is disposed.

[0041] 6 and 7, a portion of second wall 111 that defines second cutout 112 is provided with a mated portion 115 having a shape corresponding to the outer shape of pipe 20. In this embodiment, mated portion 115 has an arc shape that corresponds to the round shape of the pipe.

[0042] 5 and 6, the pipe 20 is inserted into both the first cut-out portion 102 and the second cut-out portion 112, and is assigned to the assigned portion 115. Note that, like the above-mentioned concave portion 104, a concave portion may be provided in the second wall portion 111 to shorten the gap distance between the first cut-out portion 102 and the second cut-out portion 112 and make it easier to insert the pipe 20 even if it is tilted with respect to the frame 10L when assembling the pipe 20.

[0043] 5, a first welded portion 131 is provided between the pipe 20 and the first wall portion 101, so that the pipe 20 is directly welded to the first wall portion 101 via the first welded portion 131. Note that, although a portion of the first welded portion 131 in this embodiment is disposed in the gap between the pipe 20 and the first cut-out portion 102, it is sufficient that the pipe 20 and the first wall portion 101 are connected, and the first welded portion 131 does not have to be present in the gap between the pipe 20 and the first cut-out portion 102.

[0044] The pipe 20 is directly welded to the second wall portion 111 via the second weld portion 132 by providing a second weld portion 132 between the pipe 20 and the second wall portion 111 in the fitted portion 115 .

[0045] It is sufficient that the addressed portion 115 can be welded within a range that can withstand an external load applied to the frame 10L and the pipe 20. The range in which the addressed portion 115 and the pipe 20 are welded may be not only the range in which the addressed portion 115 and the pipe 20 are in contact with each other, but also the vicinity of that range.

[0046] The structure of the second plate-shaped member according to embodiment 1 will be described below. Fig. 8 is a component drawing of the second plate-shaped member according to embodiment 1. In Fig. 8, in order to facilitate understanding, a surplus cut-out region A and a pipe fitting region B, which will be described later, are shown hatched in the region of second cut-out portion 112.

[0047] When the pipe 20 is assigned to the addressed portion 115, the second missing portion 112 is located on the opposite side of the addressed portion 115 as viewed from the pipe 20, and includes a surplus missing area A within which the pipe 20 can move. The second missing portion 112 further includes a pipe addressing area B within which the pipe 20 is assigned to the addressed portion 115. As shown in Fig. 8, in the cut-out shaped second missing portion 112, the surplus missing area A is located on the opposite side of the pipe addressing area B from the addressed portion 115.

[0048] The surplus-missing region A has a size and shape that allows the pipe 20 to be assigned to the assigned portion 115 by moving the pipe 20 in a direction intersecting the extension direction of the pipe 20, regardless of where the pipe 20 is placed in the portion including the surplus-missing region A. As a result, when assembling the pipe 20 and the second plate-like member 110, the pipe 20 can be moved via the surplus-missing region A to the pipe assignment region B to adjust the position for assigning the pipe 20 to the assigned portion 115.

[0049] Hereinafter, a description will be given of the positional relationship during assembly of the first plate-shaped member 100, the second plate-shaped member 110, and the pipe 20 according to embodiment 1. As shown in Fig. 5 to Fig. 7, when attempting to insert the pipe 20 into the assembled first plate-shaped member 100 and second plate-shaped member 110, the positions of the first cut-out portion 102 and the second cut-out portion 112 may not match the positions where the first standing wall portion 103 and the second standing wall portion 113 are welded due to manufacturing tolerances, etc.

[0050] If there were no surplus missing area A in second cut-out portion 112, the positions of first cut-out portion 102 and second cut-out portion 112 would not match, and pipe 20 could only be inserted into either first cut-out portion 102 or second cut-out portion 112. In such a case, by providing surplus missing area A, it is possible to move pipe 20 so that it passes through surplus missing area A, and adjust the position for inserting pipe 20 into second cut-out portion 112.

[0051] The following describes the method for manufacturing the seat frame according to embodiment 1. Fig. 9 is a flowchart of the method for manufacturing the seat frame according to embodiment 1.

[0052] As shown in FIG. 9, a first cutout 102 having a hole shape larger than the pipe 20 is provided in the first wall portion 101 so that the pipe 20 can be inserted (step S11). In this step, the first cutout 102 is formed to a size and shape that allows the pipe 20 to be directly welded to the first wall portion 101 regardless of the position of the first cutout 102 in which the pipe 20 is placed. The first cutout 102 is formed, for example, by punching using a press process. The step of providing the first cutout 102 may be performed before or after the step of forming the concave portion 104 and the first standing wall portion 103 of the first wall portion 101 of the first plate-like member 100.

[0053] Next, a second cutout 112 having a hole or notch shape larger than the pipe 20 so that the pipe 20 can be inserted is provided in the second wall 111 (step S12). In this step, an addressed portion 115 having a shape corresponding to the outer shape of the pipe 20 is provided in a part of the second wall 111 that defines the second cutout 112. The second cutout 112 including the addressed portion 115 is formed, for example, by punching using a press process. The step of providing the second cutout 112 may be performed before or after the step of forming the planar shape of the second wall 111 of the second plate-like member 110 and the second standing wall 113.

[0054] Next, the pipe 20 is inserted into the first cutout portion 102 and the second cutout portion 112 (step S13). Specifically, the first cutout portion 102 and the second cutout portion 112 are attached to respective positioning jigs (not shown) so that the first wall portion 101 and the second wall portion 111 face each other. The pipe 20 is inserted into the opposed first cutout portion 102 and second cutout portion 112.

[0055] Next, the pipe 20 is assigned to the assigned portion 115 (step S14). Specifically, the pipe 20 is moved through the surplus / missing area A and the position is adjusted, so that the pipe 20 is assigned to the assigned portion 115.

[0056] Next, a first welded portion 131 is provided between the pipe 20 and the first wall portion 101, so that the pipe 20 is directly welded to the first wall portion 101 via the first welded portion 131 (step S15).

[0057] Next, by providing a second welded portion 132 between the pipe 20 and the second wall portion 111, the pipe 20 is directly welded to the second wall portion 111 via the second welded portion 132 (step S16). In this step, the second welded portion 132 is provided between the pipe 20 and the second wall portion 111 in the addressed portion 115 while the state in which the pipe 20 is addressed to the addressed portion 115 is maintained.

[0058] Next, the first plate-shaped member 100 and the second plate-shaped member 110 are welded together by providing a third welded portion 133 between the first standing wall portion 103 and the second standing wall portion 113 (step S17). Note that the order in which the welded portions are welded may be any order as long as the distortion caused by welding does not affect other welded portions.

[0059] In the seat frame 1 according to the first embodiment, the first cutout portion 102 provided in the first wall portion 101 is formed to a size that allows the pipe 20 to be directly welded, and the second cutout portion 112 provided in the second wall portion 111 is provided with the pipe 20 at the applied portion 115, allowing the pipe 20 to be directly welded, so that the first plate-shaped member 100, the second plate-shaped member 110, and the pipe 20 can be assembled with a reduced number of parts without using bushes. Furthermore, even if the positions of the first cutout portion 102 and the second cutout portion 112 do not match in the direction intersecting the extension direction of the pipe 20, the pipe 20 can be adjusted to a position where welding is possible by applying the pipe 20 to the applied portion 115, allowing for highly accurate and efficient assembly.

[0060] In the seat frame 1 of embodiment 1, the above-mentioned welding structure of the pipe 20 to the frame 10L can be applied even when the frame 10L is composed of a pair of plate-shaped members having a first wall portion 101 and a second wall portion 111.

[0061] In the seat frame 1 of embodiment 1, the above-mentioned welding structure of the pipe 20 to the frame 10L can also be applied when the frame 10L is constructed by combining a first plate-shaped member 100 having a first vertical wall portion 103 and a second plate-shaped member 110 having a second vertical wall portion 113.

[0062] In the seat frame 1 of embodiment 1, the pipe 20 can be placed in the surplus missing area A and the position of the pipe 20 can be moved in a direction intersecting the extension direction of the pipe 20, which makes it easier to assemble the pipe 20 to assign it to the assigned portion 115, thereby allowing efficient assembly.

[0063] In the manufacturing method of seat frame 1 according to embodiment 1, first cutout portion 102 is formed to a size that allows pipe 20 to be directly welded, and notch-shaped second cutout portion 112 allows pipe 20 to be applied to applied portion 115, thereby allowing frame 10L and pipe 20 to be directly welded, reducing the number of parts and without using a bush. Furthermore, even if first cutout portion 102 and second cutout portion 112 do not match in the direction intersecting the extension direction of pipe 20, pipe 20 can be adjusted to a position where welding is possible by applying pipe 20 to applied portion 115, allowing assembly with high precision and efficiency.

[0064] (First variant) The following describes the structures of the frame 10L and the pipes 20 according to the first modified example. The seat frame 1 according to the first modified example differs from the seat frame 1 according to the first embodiment only in the structure of the second plate-like member 110, and therefore description of the other structures will not be repeated.

[0065] Fig. 10 is a cross-sectional view of a seat frame according to a first modified example. Fig. 11 is a partial cross-sectional view of a seat frame according to a first modified example. Note that the size of the second cutout portion 112 in Fig. 11 is shown at a different ratio for ease of understanding.

[0066] 10 and 11, a hole-shaped second cutout 112 is provided in a second wall portion 111 of a second plate-like member 110 in the first modified example. The second cutout 112 is formed larger than the pipe 20 so that the pipe 20 can be inserted. A fitted portion 115 having a shape corresponding to the outer shape of the pipe 20 is provided in a part of the second wall portion 111 that defines the second cutout 112.

[0067] The structure of the second plate-shaped member 110 according to the first modified example will be described below. Fig. 12 is a component drawing of the second plate-shaped member according to the first modified example. In Fig. 12, the area of ​​the second cut-out portion 112 is shown hatched for ease of understanding. The second cut-out portion 112 is configured to include a surplus cut-out area A and a pipe allocation area B.

[0068] The surplus missing region A is located on the opposite side of the pipe addressing region B from the addressed portion 115 in the hole-shaped second missing portion 112. In this modified example, as in the case of the first embodiment, when assembling the pipe 20 and the second plate-like member 110, the pipe 20 can be moved via the surplus missing region A to the pipe addressing region B to adjust the position for allocating the pipe 20 to the addressed portion 115.

[0069] Furthermore, even if the pipe 20 can only be inserted into either the first cut-out portion 102 or the second cut-out portion 112, by providing a surplus cut-out area A in the second cut-out portion 112, the position for inserting the pipe 20 can be adjusted by moving the pipe 20 so that it passes through the surplus cut-out area A.

[0070] (Second variant) The structure of the frame 10L according to the second modified example will be described below. The seat frame 1 according to the second modified example differs from the seat frame 1 according to the first embodiment only in the structures of the first plate member 100 and the second plate member 110, and therefore the description of the other configurations will not be repeated.

[0071] Fig. 13 is a cross-sectional view of a seat frame according to a second modified example. As shown in Fig. 13, the first standing wall portion 103 and the second standing wall portion 113 in the second modified example are welded together at one side, with the inner side portion 103s of the first standing wall portion 103 and the outer side portion 113s of the second standing wall portion 113 overlapping each other. At the other side, the outer side portion 103s of the first standing wall portion 103 and the inner side portion 113s of the second standing wall portion 113 overlapping each other.

[0072] Even in this configuration, the above-described welding structure of the pipe 20 to the frame 10L can be applied.

[0073] (Embodiment 2) Hereinafter, there will be described a seat frame according to embodiment 2. The seat frame according to embodiment 2 differs from seat frame 1 according to embodiment 1 only in the configuration of frame 10L, and therefore description of the other configuration will not be repeated.

[0074] Fig. 14 is a cross-sectional view of a single plate-shaped member according to embodiment 2. As shown in Fig. 14, a frame 10L in this embodiment is formed of a single plate-shaped member 200. Specifically, the frame 10L includes a first wall portion 101, a second wall portion 111, and a connection portion 210. The first wall portion 101 is provided opposite the second wall portion 111.

[0075] The connection portion 210 connects one of a pair of ends of the first wall portion 101 located in a direction intersecting the extension direction of the pipe 20 to one of a pair of ends of the second wall portion 111 located in a direction intersecting the extension direction of the pipe 20.

[0076] The frame 10L has a first standing wall portion 103 erected toward the second wall portion 111 from the other of a pair of ends of the first wall portion 101 located in a direction intersecting the extension direction of the pipe 20. Furthermore, the frame 10L has a second standing wall portion 113 erected toward the first wall portion 101 from the other of a pair of ends of the second wall portion 111 located in a direction intersecting the extension direction of the pipe 20.

[0077] The first standing wall portion 103 and the second standing wall portion 113 are welded in a state in which they are butted against each other. The butted first standing wall portion 103 and the second standing wall portion 113 are welded at a third welded portion 233.

[0078] The first standing wall portion 103 and the second standing wall portion 113 may be welded with their side surfaces overlapping each other. The connection between the first standing wall portion 103 and the second standing wall portion 113 is not limited to welding, and may be, for example, connection by bolt fastening.

[0079] The structures of the frame 10L and the pipe 20 according to embodiment 2 will be described below. Fig. 15 is a cross-sectional view of the pipe and a single plate-like member according to embodiment 2. As shown in Fig. 15, the frame 10L is made of a single plate-like member 200, and the pipe 20 is inserted into the first cut-out portion 102 and the second cut-out portion 112.

[0080] The pipe 20 and the first cutout portion 102 are directly welded to each other via a first welded portion 131. The mated portion 115, which is a part of the second cutout portion 112, is directly welded to the pipe 20 via a second welded portion 132.

[0081] In this embodiment, similarly to the first embodiment, the second missing portion 112 includes a surplus missing area A that is located on the opposite side of the pipe 20 from the addressed portion 115 when the pipe 20 is assigned to the addressed portion 115. The surplus missing area A makes it possible to adjust the position for inserting the pipe 20 into the second missing portion 112 by moving the pipe 20 via the surplus missing area A. In addition, it is possible to adjust the position for assigning the pipe 20 to the addressed portion 115 by moving the pipe 20 to the pipe assignment area B via the surplus missing area A.

[0082] Hereinafter, a method for manufacturing a seat frame according to embodiment 2 will be described. Fig. 16 is a flowchart of the method for manufacturing a seat frame according to embodiment 2. As shown in Fig. 16, a first cutout portion 102 and a second cutout portion 112 larger than the pipe 20 so that the pipe 20 can be inserted are provided in the frame 10L which is a single, flat, plate-like member (step S21).

[0083] Next, the frame 10L is folded (step S22). The frame 10L is folded, for example, by pressing, so that the first wall portion 101 and the second wall portion 111 that are continuous via the connection portion 210 are formed, and the first standing wall portion 103 and the second standing wall portion 113 are butted against each other.

[0084] Next, the pipe 20 is inserted into the first cutout portion 102 and the second cutout portion 112 (step S23). Next, the pipe 20 is assigned to the assigned portion 115 (step S24). Next, a first welded portion 131 is provided between the pipe 20 and the first wall portion 101, so that the pipe 20 is directly welded to the first wall portion 101 via the first welded portion 131 (step S25). Next, a second welded portion 132 is provided between the pipe 20 and the second wall portion 111, so that the pipe 20 is directly welded to the second wall portion 111 via the second welded portion 132 (step S26). Next, the first standing wall portion 103 and the second standing wall portion 113 are welded via the third welded portion 233 (step S27).

[0085] In the seat frame 1 according to the second embodiment, the first cut-out portion 102 provided in the first wall portion 101 is formed to a size that allows the pipe 20 to be directly welded, and the hole-shaped second cut-out portion 112 provided in the second wall portion 111 allows the pipe 20 to be applied at the applied portion 115, thereby allowing the first plate-shaped member 100, the second plate-shaped member 110, and the pipe 20 to be directly welded, without using a bush and reducing the number of parts. Furthermore, even if the positions of the first cut-out portion 102 and the second cut-out portion 112 do not match in the direction intersecting the extension direction of the pipe 20, the pipe 20 can be adjusted to a position where welding is possible by applying the pipe 20 to the applied portion 115, allowing for highly accurate and efficient assembly.

[0086] In the seat frame 1 of embodiment 2, the above-mentioned welding structure of the pipe 20 to the frame 10L can be applied even when the frame 10L is composed of a single plate-like member 200 having a first wall portion 101 and a second wall portion 111.

[0087] In the seat frame 1 of embodiment 2, the above-mentioned welding structure of the pipe 20 to the frame 10L can be applied even when the frame 10L is configured to be made of a single plate-like member 200 having a first vertical wall portion 103 and a second vertical wall portion 113.

[0088] In the seat frame 1 of embodiment 2, with the pipe 20 placed in the surplus missing area A, the position of the pipe 20 can be moved in a direction intersecting the extension direction of the pipe 20, making it easy to assign the pipe 20 to the assigned portion 115, thereby enabling the frame 10L and the pipe 20 to be efficiently assembled.

[0089] In the manufacturing method of seat frame 1 according to embodiment 2, first cutout portion 102 is formed to a size that allows pipe 20 to be directly welded, and notch-shaped second cutout portion 112 allows pipe 20 to be applied to applied portion 115, thereby allowing frame 10L and pipe 20 to be directly welded, reducing the number of parts and without using a bush. Furthermore, even if first cutout portion 102 and second cutout portion 112 do not match in the direction intersecting the extension direction of pipe 20, pipe 20 can be adjusted to a position where welding is possible by applying pipe 20 to applied portion 115, allowing assembly with high precision and efficiency.

[0090] (Third variant) The following describes the structures of the frame 10L and the pipe 20 according to the third modified example. The seat frame 1 according to the third modified example differs from the seat frame 1 according to the second embodiment only in the structure of the second cutout portion 112, and therefore description of the other configurations will not be repeated.

[0091] Fig. 17 is a cross-sectional view of a seat frame according to a third modified example. As shown in Fig. 17, a second wall portion 111 of a frame 10L in the third modified example is provided with a hole-shaped second cutout portion 112. A mating portion 115 having a shape corresponding to the outer shape of the pipe 20 is provided in a part of the second wall portion 111 that defines the second cutout portion 112.

[0092] In the second cutout portion 112, the pipe 20 can move in a direction intersecting the extending direction of the pipe 20. This makes it possible to adjust the position of the pipe 20 for allocating the pipe 20 to the allocated portion 115 when assembling the pipe 20 and the second plate-like member 110.

[0093] (Other forms) The structure in this embodiment in which first cut-out portion 102 is formed to a size that allows pipe 20 to be directly welded, and second cut-out portion 112 is adapted to receive pipe 20 at adapted portion 115, thereby directly welding pipe 20, can be applied to both seat back frames and cushion frames. Frame 10L is not limited to a configuration of two plates, first plate-like member 100 and second plate-like member 110, but may be a configuration in which three or more plate-like members extend in the seat up-down direction, and each member is welded.

[0094] It should be noted that the above-mentioned embodiments disclosed herein are illustrative in all respects and are not intended to be a basis for restrictive interpretation. Therefore, the technical scope of the present disclosure should not be interpreted solely by the above-mentioned embodiments. Furthermore, all modifications within the meaning and scope equivalent to the claims are included. In the above-mentioned description of the embodiments, configurations that can be combined may be combined with each other. [Explanation of symbols]

[0095] 1 seat frame, 10, 10L, 10R frame, 20 pipe, 30 upper pipe, 31 holder, 40 lower arm, 100 first plate-shaped member, 101 first wall portion, 102 first missing portion, 103 first vertical wall portion, 103s, 113s side portion, 104 concave portion, 110 second plate-shaped member, 111 second wall portion, 112 second missing portion, 113 second vertical wall portion, 115 fitted portion, 131 first welded portion, 132 second welded portion, 133, 233 third welded portion, 200 single plate-shaped member, 210 connection portion, A excess missing area, B pipe fitting area.

Claims

1. A seat frame forming a framework of a vehicle seat, a frame including a first wall portion and a second wall portion opposed to each other; A pipe fixed to the frame, The first wall portion is provided with a first cutout portion having a hole shape, The second wall portion is provided with a second cutout portion having a hole shape or a notch shape, Each of the first cutout portion and the second cutout portion is formed larger than the pipe so that the pipe can be inserted therein, the first cutout portion has a size and a shape that allow the pipe to be directly welded to the first wall portion regardless of the position of the first cutout portion in which the pipe is disposed, A portion of the second wall portion that defines the second cutout portion is provided with a fitted portion having a shape corresponding to an outer shape of the pipe, The pipe is inserted into both the first cutout portion and the second cutout portion and is assigned to the assigned portion, a first welded portion is provided between the pipe and the first wall portion, so that the pipe is directly welded to the first wall portion via the first welded portion; a second welded portion is provided between the pipe and the second wall portion in the fitted portion and / or in the vicinity thereof, so that the pipe is directly welded to the second wall portion via the second welded portion; The second missing portion includes an excess missing region located on the opposite side of the addressed portion from the pipe when the pipe is assigned to the addressed portion, The surplus / missing region has a size and shape that allows the pipe to be moved in a direction intersecting the extension direction of the pipe to be applied to the applied portion regardless of the position of the pipe in the portion including the surplus / missing region, When viewed along the extension direction of the pipe, the excess missing region is larger than a gap between the first wall portion and the pipe at a portion defining the first missing portion, A seat frame, wherein the surplus / missing region becomes wider as it moves away from the addressed portion when viewed along the extending direction of the pipe.

2. The frame is composed of a pair of plate-like members that are aligned in an extending direction of the pipe and are integrated by being combined with each other, the first wall portion is included in a first plate-like member that is one of the pair of plate-like members, The seat frame according to claim 1 , wherein the second wall portion is included in a second plate member that is the other of the pair of plate members.

3. the first plate-like member has a first standing wall portion erected from each of a pair of ends of the first wall portion located in a direction intersecting an extension direction of the pipe toward the second wall portion, the second plate-like member has a second standing wall portion erected from each of a pair of ends of the second wall portion located in a direction intersecting the extension direction of the pipe toward the first wall portion, The seat frame according to claim 2 , wherein the corresponding first standing wall portion and the corresponding second standing wall portion are welded to each other in a superposed or abutted state.

4. The seat frame according to claim 1 , wherein the frame is formed of a single plate-like member including the first wall portion and the second wall portion.

5. The plate-like member is a connection portion that connects one of a pair of ends of the first wall portion located in a direction intersecting the extension direction of the pipe and one of a pair of ends of the second wall portion located in a direction intersecting the extension direction of the pipe; a first standing wall portion standing from the other of a pair of ends of the first wall portion located in a direction intersecting the extending direction of the pipe toward the second wall portion; a second standing wall portion standing from the other of the pair of ends of the second wall portion located in a direction intersecting the extending direction of the pipe toward the first wall portion, The seat frame according to claim 4 , wherein the first standing wall portion and the second standing wall portion are welded to each other in a superposed or abutted state.

6. A method for manufacturing a seat frame comprising a frame that forms a framework of a vehicle seat and includes a first wall portion and a second wall portion that face each other, and a pipe fixed to the frame, comprising: providing a first cutout portion in the first wall portion, the first cutout portion having a hole shape larger than the pipe so that the pipe can be inserted; providing a second cutout portion in the second wall portion, the second cutout portion being larger than the pipe so that the pipe can be inserted; a step of placing the first wall portion and the second wall portion in a state where they face each other and the pipe is inserted into both the first cutout portion and the second cutout portion; providing a first weld between the pipe and the first wall portion, thereby directly welding the pipe to the first wall portion via the first weld; providing a second weld between the pipe and the second wall portion, thereby directly welding the pipe to the second wall portion via the second weld; In the step of providing the first cutout portion in the first wall portion, the first cutout portion is formed to a size and shape that allows the pipe to be directly welded to the first wall portion regardless of the position of the first cutout portion in which the pipe is disposed, In the step of providing the second cutout portion in the second wall portion, a portion of the second wall portion that defines the second cutout portion is provided with a fitted portion having a shape corresponding to an outer shape of the pipe, In the step of directly welding the pipe to the second wall portion via the second welded portion, the second welded portion is provided between the pipe and the second wall portion in and / or near the addressed portion while maintaining the state in which the pipe is addressed to the addressed portion; The second missing portion includes an excess missing region located on the opposite side of the addressed portion from the pipe when the pipe is assigned to the addressed portion, The surplus / missing region has a size and shape that allows the pipe to be moved in a direction intersecting the extension direction of the pipe to be applied to the applied portion regardless of the position of the pipe in the portion including the surplus / missing region, When viewed along the extension direction of the pipe, the excess missing region is larger than a gap between the first wall portion and the pipe at a portion defining the first missing portion, A manufacturing method for a seat frame, wherein the surplus / minus region becomes wider as it moves away from the addressed portion when viewed along the extending direction of the pipe.

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