Vehicle seats

Abstract

To enhance the rigidity of a side frame of a vehicle seat.SOLUTION: A vehicle seat 1 (a vehicular seat S) has a side frame (a cushion side frame 10). The side frame has a long-sized, plate-like base wall 11 and a first flange part 12 extending in a direction of crossing with the base wall 11 from one end in a short direction of the base wall 11. The first flange part 12 has a first processed part PP1 on which strengthening processing has been performed by hardening or emboss processing.SELECTED DRAWING: Figure 9

Description

[Technical Field]

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

[0002] Conventionally, a vehicle seat provided with a side frame having a flange portion is known (see Patent Document 1). In this technology, the flange portion is not subjected to a strengthening treatment such as hardening or embossing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2017 / 022737 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, it is desirable for the side frame to have high rigidity.

[0005] Therefore, an object of the present invention is to increase the rigidity of the side frame. [Means for solving the problem]

[0006] In order to solve the above problem, the vehicle seat according to the present invention includes a side frame. The side frame has a long, plate-shaped base wall and a first flange portion extending from one end of the base wall in a short side direction in a direction intersecting the base wall. The first flange portion has a first processed portion that has been subjected to a strengthening treatment such as hardening or embossing.

[0007] According to this configuration, the first flange portion has the first processed portion that has been subjected to a strengthening process such as hardening or embossing, so that the rigidity of the side frame can be increased.

[0008] The first flange portion may have a first non-treated portion that is not subjected to the strengthening treatment.

[0009] According to this configuration, the first non-processed portion can be used as a portion that absorbs impact in the event of a collision, for example.

[0010] The first processed portion may have a plurality of protrusions formed by the embossing process.

[0011] According to this configuration, the rigidity of the first processing section can be increased by the plurality of protrusions.

[0012] Furthermore, the side frame may be a cushion side frame extending in the front-to-rear direction, the first flange portion may be arranged at the lower end of the base wall, the first non-treatment portion may include the rear end of the first flange portion, and the first treatment portion may be arranged in front of the first non-treatment portion.

[0013] According to this configuration, the portion having the first non-treated portion at the rear end of the side frame can be deformed in the event of a collision, and the impact can be absorbed by the deformation of the portion having the first non-treated portion.

[0014] The length from one end to the other end of the first non-treatment portion in the front-rear direction may be smaller than the length from one end to the other end of the first treatment portion in the front-rear direction.

[0015] According to this configuration, the rigidity of the side frame can be increased compared to, for example, a configuration in which the length of the first processed portion is shorter than the length of the first non-processed portion.

[0016] The side frame may also have a second flange portion extending from an upper end of the base wall in a direction intersecting the base wall, and the second flange portion may have a second processed portion to which the strengthening treatment has been applied.

[0017] According to this configuration, the second flange portion has the second processed portion, which can further increase the rigidity of the side frame.

[0018] Furthermore, the second flange portion may have a second non-treated portion that is not subjected to the strengthening treatment, the second treated portion may include a rear end of the second flange portion, and the second non-treated portion may be arranged in front of the second treated portion.

[0019] With this configuration, the second processed portion can increase the rigidity of the rear portion of the second flange, which receives a large load from the occupant. Also, by making the front portion of the second flange the second non-processed portion, it is possible to increase the accuracy of the shape and position of holes, for example, for attaching other members to the front portion of the second flange.

[0020] The length from one end to the other end of the second non-treatment portion in the front-rear direction may be smaller than the length from one end to the other end of the second treatment portion in the front-rear direction.

[0021] According to this configuration, the rigidity of the side frame can be increased compared to, for example, a configuration in which the length of the second processed portion is shorter than the length of the second non-processing portion.

[0022] The length from one end to the other end of the first processing section in the front-rear direction may be greater than the length from one end to the other end of the second processing section in the front-rear direction.

[0023] This configuration increases the rigidity of the lower portion of the side frame.

[0024] The second processing section may be disposed within the range of the first processing section in the front-rear direction.

[0025] According to this configuration, the rigidity of the side frame can be increased compared to a configuration in which the second processing section is disposed outside the range of the first processing section in the front-rear direction, for example. [Effects of the Invention]

[0026] According to the present invention, the first processed portion can increase the rigidity of the side frame.

[0027] Furthermore, by providing the first non-treated portion on the first flange portion, the first non-treated portion can be used as a portion that absorbs impact during a collision, for example.

[0028] Furthermore, by forming a plurality of protrusions on the first processed portion by embossing, the rigidity of the first processed portion can be increased by the plurality of protrusions.

[0029] Furthermore, by providing a first non-treated portion on the rear end side of the first flange portion located on the lower side of the cushion side frame, the portion having the first non-treated portion at the rear end of the cushion side frame can be deformed during a collision, and the impact can be absorbed by the deformation of the portion having the first non-treated portion.

[0030] Furthermore, by making the length of the first non-treatment portion shorter than the length of the first treatment portion, the rigidity of the side frame can be increased compared to, for example, a configuration in which the length of the first treatment portion is shorter than the length of the first non-treatment portion.

[0031] Furthermore, by providing the second processed portion on the second flange portion of the side frame, the rigidity of the side frame can be further increased.

[0032] Furthermore, by providing the second processed portion on the rear end side of the second flange, the rigidity of the rear portion of the second flange to which a large load from the occupant is applied can be increased by the second processed portion. Furthermore, by providing the front portion of the second flange with the second non-processed portion, it is possible to increase the accuracy of the shape and position of holes for attaching other members to the front portion of the second flange, for example.

[0033] Furthermore, by making the length of the second non-treatment portion shorter than the length of the second treatment portion, the rigidity of the side frame can be increased compared to, for example, a configuration in which the length of the second treatment portion is shorter than the length of the second non-treatment portion.

[0034] Furthermore, by making the length of the first processing portion greater than the length of the second processing portion, the rigidity of the lower portion of the side frame can be increased.

[0035] Furthermore, by positioning the second processing section within the range of the first processing section in the fore-and-aft direction, the rigidity of the side frame can be increased compared to, for example, a configuration in which the second processing section is positioned outside the range of the first processing section in the fore-and-aft direction. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a perspective view of a seat according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a cushion frame and a back frame. [Figure 3] This is a view of the cushion side frame and height mechanism from the inside in the left-right direction, with (a) showing the cushion side frame in its uppermost position and (b) showing it in its lowermost position. [Figure 4] FIG. 2 is a perspective view showing the structure around the right end of the front pipe. [Figure 5] FIG. 4 is a cross-sectional view showing the structure around the right end of the front pipe. [Figure 6] 1A is a side view of the bracket as seen from the outside in the left-right direction, and FIG. 1B is a side view of the bracket as seen from the inside in the left-right direction. [Figure 7] FIG. 10 is a side view of the structure around the left bracket as seen from the outside in the left-right direction. [Figure 8] FIG. 10 is a cross-sectional view showing the structure around the left bracket. [Figure 9] 9(a) is a side view showing the treated and untreated portions of the cushion side frame, FIG. 9(b) is a cross-sectional view taken along line II of FIG. 9(a), and FIG. 9(c) is an enlarged perspective view showing the protruding portion of the treated portion. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this specification, the terms "front, back, left, right, top, bottom" refer to the front, back, left, right, top, bottom as seen from a person sitting in the seat. As shown in FIG. 1, the vehicle seat according to this embodiment is configured as a vehicle seat S to be installed in an automobile, and includes a seat cushion S1, a seat back S2, and a headrest S3.

[0038] The seat cushion S1 is constructed by covering a cushion frame F1 (see FIG. 2) with a cushion pad and a covering material. The seat back S2 is constructed by covering a back frame F2 (see FIG. 2) with a pad and a covering material. The headrest S3 is constructed by covering a headrest frame (not shown) with a pad and a covering material.

[0039] As shown in FIG. 2, the cushion frame F1 includes cushion side frames 10 as side frames, a pan frame PF, a front pipe 20 as a connecting pipe, and It has a rear pipe RP and a bracket 30. The cushion side frame 10, the pan frame PF and the bracket 30 are made of plate-like members. The front pipe 20 and the rear pipe RP are made of cylindrical pipe material.

[0040] The cushion side frames 10 and the brackets 30 are arranged one on each side of the cushion frame F1 (seat cushion S1). The cushion side frames 10 extend in the front-rear direction. The brackets 30 are fixed to the rear ends of the cushion side frames 10.

[0041] The pan frame PF and the front pipe 20 connect the front end portions of the left and right cushion side frames 10. The rear pipe RP connects the rear end portions of the left and right cushion side frames 10. The rear pipe RP has a straight shape and extends in the left-right direction.

[0042] The back frame F2 has back side frames 41, an upper frame 42, and a lower frame 43. The back side frames 41, the upper frame 42, and the lower frame 43 are made of plate-shaped members. One back side frame 41 is disposed on each side of the back frame F2 (seat back S2). The back side frames 41 extend in the vertical direction.

[0043] The upper frame 42 connects the upper ends of the left and right back side frames 41. The lower frame 43 connects the lower ends of the left and right back side frames 41.

[0044] The vehicle seat S further includes a reclining mechanism 50 and a height mechanism 60. The reclining mechanism 50 tilts the back frame F2 relative to the cushion frame F1. The height mechanism 60 adjusts the height of the cushion frame F1. One reclining mechanism 50 and one height mechanism 60 are disposed on each side of the cushion frame F1. The bracket 30 rotatably supports the back side frame 41 via the reclining mechanism 50.

[0045] 3(a), the height mechanism 60 includes a front link 61 as a link and a rear link 62 arranged at a distance behind the front link 61. The front link 61 and the rear link 62 have upper ends rotatably connected to the cushion side frame 10 and lower ends rotatably connected to an upper rail UR. The upper rail UR is supported by a lower rail (not shown) fixed to the floor of the vehicle body so as to be movable in the front-rear direction.

[0046] The front link 61 is rotatable about a first axis X1 relative to the cushion side frame 10. More specifically, the upper end of the front link 61 is rotatably supported by a flanged pin PN fixed to the cushion side frame 10. The front link 61 is rotatable about a second axis X2 relative to the upper rail UR.

[0047] The rear link 62 is rotatable about a third axis X3 relative to the cushion side frame 10. More specifically, an upper end of the rear link 62 is rotatably supported by the rear pipe RP. The rear link 62 is rotatable about a fourth axis X4 relative to the upper rail UR.

[0048] The front link 61 is a straight, plate-like member. Specifically, a straight line L1 connecting the first axis X1 and the second axis X2 is located between two linear end edges 61A that face each other in the short direction of the front link 61. The two end edges 61A are parallel to each other.

[0049] The rear link 62 is a plate-like member with a generally straight shape. Specifically, a straight line L2 connecting the third axis X3 and the fourth axis X4 is located between two linear end edges 62A that face each other in the short direction among the end edges of the rear link 62. The two end edges 62A are symmetrical with respect to the straight line L2 and are inclined with respect to the straight line L2 so as to approach each other from the upper end to the lower end of the rear link 62.

[0050] The front link 61 and the rear link 62 are rotatable between an elevated position shown in Fig. 3(a) and a lowered position shown in Fig. 3(b). The elevated position is the position of the links 61, 62 when the cushion side frame 10 is at its uppermost position. The lowered position is the position of the links 61, 62 when the cushion side frame 10 is at its lowermost position.

[0051] The front pipe 20 is disposed in front of the first axis X1. A distance D3 in the front-rear direction from the front pipe 20 to the first axis X1 is shorter than the length of the front link 61.

[0052] The front pipe 20 is disposed on the second axis X2 when the front link 61 is in the raised position. The front pipe 20 is disposed between the first axis X1 and the second axis X2 in the front-rear direction when the front link 61 is in the lowered position. The front pipe 20 (first portion 21, which will be described in detail later) overlaps with the front link 61 when viewed from the left and right when the front link 61 is in the lowered position.

[0053] The cushion side frame 10 has a pipe joint 10A to which the front pipe 20 is joined and a link connection portion 10B to which the front link 61 is connected. In the vertical direction, the width W1 of the pipe joint 10A is smaller than the width W2 of the link connection portion 10B. A first axis X1, which is the axis of rotation of the front link 61 relative to the cushion side frame 10, is located within a range W3 of the joint portion of the front pipe 20 with the cushion side frame 10 (a second portion 22 described later) in the vertical direction.

[0054] A part of the front pipe 20 (more specifically, a part of a first portion 21 described later) does not overlap with the cushion side frame 10 when viewed from the left-right direction. In other words, the lower end of the cushion side frame 10 overlaps with the first portion 21 of the front pipe 20 when viewed from the left-right direction.

[0055] 4, the front pipe 20 has a first section 21 extending in the left-right direction, a second section 22 disposed above the first section 21 and fixed to the cushion side frame 10 by welding or the like, and a third section 23 bent upward from the first section 21 and connected to the second section 22. The second section 22 and the third section 23 are provided on the left and right sides of the first section 21. The second section 22 is disposed above the front link 61.

[0056] 5, the second section 22 extends in the left-right direction. The third section 23 has a first bent portion 23A bent upward from the first section 21, a straight portion 23B extending obliquely in a straight line upward and outward in the left-right direction from the first bent portion 23A, and a second bent portion 23C bent outward from the straight portion 23B to connect to the second section 22. The front link 61 is disposed within the range of the second section 22 in the left-right direction.

[0057] 6 and 7, the bracket 30 has a first plate-shaped portion 31 fixed to the back side frame 41 via the reclining mechanism 50, a second plate-shaped portion 32 fixed to the cushion side frame 10, a fragile portion 33 connected to the first plate-shaped portion 31 and the second plate-shaped portion 32, and a flange 34. As shown in FIG. 8, the first plate-shaped portion 31 is disposed on the outer side of the back side frame 41 in the left-right direction. The second plate-shaped portion 32 is disposed on the inner side of the cushion side frame 10 in the left-right direction. The first plate-shaped portion 31 is also disposed on the outer side of the second plate-shaped portion 32 in the left-right direction.

[0058] The reclining mechanism 50 includes a fixed member 51 fixed to the bracket 30 and a movable member 52 rotatably supported by the fixed member 51. The movable member 52 is fixed to the lower end of the backside frame 41 by welding or the like.

[0059] As shown in FIGS. 6 and 7, the first plate-shaped portion 31 has a first hole 31A, a second hole 31B, a third hole 31C, and a fourth hole 31D for fixing the fixing member 51 of the reclining mechanism 50. The first hole 31A and the second hole 31B are spaced apart in the front-rear direction. The third hole 31C and the fourth hole 31D are spaced apart in the up-down direction. The third hole 31C and the fourth hole 31D are located between the first hole 31A and the second hole 31B in the front-rear direction. The third hole 31C is located above the first hole 31A and the second hole 31B. The fourth hole 31D is located below the first hole 31A and the second hole 31B.

[0060] The fixing member 51 has four bosses 51A. The four bosses 51A are arranged at intervals on a circumference centered on the rotation axis X5 of the back side frame 41 relative to the cushion side frame 10. One boss 51A fits into the first hole 31A, and the other boss 51A fits into the second hole 31B. One of the remaining two bosses 51A fits into the third hole 31C, and the other fits into the fourth hole 31D. Each boss 51A is joined to each of the holes 31A to 31D by welding.

[0061] The second plate-shaped portion 32 has a first fixing portion 32A and a second fixing portion 32B that are fixed to the cushion side frame 10. The first fixing portion 32A and the second fixing portion 32B are formed with holes H1 and H2 through which a bolt BL (see FIG. 8) passes.

[0062] The outer surfaces of the first and second fixing portions 32A and 32B in the left-right direction contact the inner surfaces of the cushion side frame 10. As shown in Fig. 6(b) and Fig. 8, nuts NT to which bolts BL are fastened are fixed to the inner surfaces of the first and second fixing portions 32A and 32B in the left-right direction.

[0063] The fragile portion 33 is a portion that becomes the starting point of deformation of the bracket 30 when an impact is applied to the bracket 30 during a vehicle collision, etc. As shown in Fig. 8, the fragile portion 33 bends inward in the left-right direction from the lower end of the first plate-shaped portion 31, and then bends downward to connect to the second plate-shaped portion 32. In other words, the fragile portion 33 is configured not to protrude outward in the left-right direction from the outer surface 31F on the outer side in the left-right direction of the first plate-shaped portion 31 (see Fig. 8).

[0064] 7, the fragile portion 33 extends from the first fixing portion 32A to the second fixing portion 32B. More specifically, the fragile portion 33 extends from the front end 30A to the rear end 30B of the bracket 30. The rear portion of the upper end E1 of the cushion side frame 10 extends obliquely upward and rearward. The front end 30A of the bracket 30 extends obliquely upward and rearward along a substantial extension of the rear portion of the upper end E1 of the cushion side frame 10.

[0065] The cushion side frame 10 has a first rear end E2 and a second rear end E3 located above the first rear end E2. An upper portion of the first rear end E2 extends upward. The second rear end E3 extends obliquely upward and forward from the upper end of the first rear end E2 while curving, and is connected to the upper end E1. The rear end 30B of the bracket 30 extends upward along a substantial extension of the upper portion of the first rear end E2. The fragile portion 33 extends from the upper end E1 of the cushion side frame 10 to the first rear end E2.

[0066] A distance D is provided between the weak portion 33 and the second rear end E3 of the cushion side frame 10. The distance D1 between the rear end of the weak portion 33 and the second rear end E3 is larger than the distance D2 between the front end of the weak portion 33 and the second rear end E3.

[0067] 6(a), the fragile portion 33 has a first arc-shaped portion 33A that is convex diagonally upward and rearward when viewed from the left and right. The first arc-shaped portion 33A includes the front end of the bracket 30. The second arc-shaped portion 33B extends from the rear end of the first arc-shaped portion 33A to the rear end of the bracket 30.

[0068] The first fixing portion 32A, specifically the hole H1, is located on a first normal line L3 at a predetermined first position P1 of the first arc-shaped portion 33A. The second fixing portion 32B, specifically the hole H2, is located on a second normal line L4 at a predetermined second position P2 of the second arc-shaped portion 33B.

[0069] 6(a) and 6(b), the flange 34 is bent inward in the left-right direction from the rear end 30B of the bracket 30. The flange 34 extends from the first plate-shaped portion 31, through the weak portion 33, to the second plate-shaped portion 32.

[0070] As shown in Figure 9(a), the cushion side frame 10 has a long, plate-like base wall 11 extending in the front-rear direction, a first flange portion 12 located at the lower end (one end in the short direction) of the base wall 11, and a second flange portion 13 located at the upper end (the other end in the short direction) of the base wall 11. The base wall 11 has a surface that intersects with the left-right direction, more specifically, is perpendicular to it. The base wall 11 has a first mounting hole H11 into which the end of the front pipe 20 is inserted, a second mounting hole H12 into which a pin PN (see Figure 4) is inserted, and a third mounting hole H13 into which the rear pipe RP is inserted.

[0071] The base wall 11 also has a fourth mounting hole H14 for mounting the first fixing portion 32A of the bracket 30, and a fifth mounting hole H15 for mounting the second fixing portion 32B of the bracket 30. The fourth mounting hole H14 is located in front of the rear pipe RP, and the fifth mounting hole H15 is located behind the rear pipe RP.

[0072] As shown in Fig. 9(b), the first flange portion 12 has a bent portion 12A and a flat portion 12B. The bent portion 12A is bent outward in the left-right direction from the lower end of the base wall 11 and then bent back inward in the left-right direction. The flat portion 12B extends in the left-right direction (a direction perpendicular to the base wall 11) from the inner end of the bent portion 12A toward the inside in the left-right direction. The flat portion 12B protrudes inward in the left-right direction beyond the base wall 11.

[0073] The second flange portion 13 has a bent portion 13A and a flat portion 13B. The bent portion 13A is bent outward in the left-right direction from the upper end of the base wall 11, and then bent back inward in the left-right direction. The flat portion 13B extends in the left-right direction (a direction perpendicular to the base wall 11) from the inner end of the bent portion 13A in the left-right direction toward the inside in the left-right direction. The flat portion 13B protrudes more inward in the left-right direction than the base wall 11.

[0074] 9(a), the first flange portion 12 has a first processed portion PP1 that has been subjected to a strengthening treatment by embossing (hereinafter also referred to as "embossing") and first non-processed portions NP11 and NP12 that have not been embossed. The second flange portion 13 has a second processed portion PP2 that has been embossed and second non-processed portions NP2 that have not been embossed.

[0075] 9(c), the first processing section PP1 and the second processing section PP2 have a plurality of protrusions CV formed by embossing. The protrusions CV are, for example, arranged at intervals in a predetermined direction and arranged at intervals in an intersecting direction that intersects the predetermined direction.

[0076] The first processing section PP1 and the second processing section PP2 each have a curved section 12A, 13A and a flat section 12B, 13B extending from one end to the other in the front-rear direction. The aforementioned multiple protrusions CV are formed on both the curved sections 12A, 13A and the flat sections 12B, 13B of each processing section PP1, PP2. Note that it is sufficient that the multiple protrusions CV are formed on at least one of the curved sections and the flat sections.

[0077] The first non-treatment portion NP11 includes the rear end of the first flange portion 12. The first non-treatment portion NP12 includes the front end of the first flange portion 12. The first treatment portion PP1 is disposed between the first non-treatment portion NP11 and the first non-treatment portion NP12 in the front-rear direction.

[0078] The rear first non-treatment portion NP11 has a bent portion 12A and a flat portion 12B. The rear first non-treatment portion NP11 extends in a curved manner upward from the rear end of the first treatment portion PP1. The front first non-treatment portion NP12 does not have the bent portion 12A, but has only the flat portion 12B. Specifically, the front first non-treatment portion NP12 bends inward in the left-right direction from the lower end of the base wall 11 and then extends along the left-right direction.

[0079] The second processing section PP2 includes the rear end of the second flange portion 13. The second non-processing section NP2 is disposed in front of the second processing section PP2. The second non-processing section NP2 includes the front end of the second flange portion 13. The second non-processing section NP2 does not have the bent portion 13A, but only has the flat portion 13B. Specifically, the second non-processing section NP2 bends inward in the left-right direction from the upper end of the base wall 11 and then extends along the left-right direction.

[0080] The length from one end to the other in the front-to-rear direction of the first non-treatment sections NP11 and NP12 is shorter than the length from one end to the other in the front-to-rear direction of the first treatment section PP1, and the length from one end to the other in the front-to-rear direction of the second non-treatment section NP2 is shorter than the length from one end to the other in the front-to-rear direction of the second treatment section PP2.

[0081] The length from one end to the other in the front-rear direction of the first processing section PP1 is greater than the length from one end to the other in the front-rear direction of the second processing section PP2. In the front-rear direction, the second processing section PP2 is disposed within the range of the first processing section PP1.

[0082] The rear end of the first processing section PP1 is located behind the rear pipe RP and in front of the fifth mounting hole H15, and the rear end of the second processing section PP2 is located behind the fourth mounting hole H14 and in front of the rear pipe RP.

[0083] The front end of the first processing section PP1 is located forward of the front pipe 20. The front end of the second processing section PP2 is located rearward of the front link 61.

[0084] As described above, the following effects can be obtained in this embodiment. As shown in FIG. 8, the second plate-shaped portion 32 of the bracket 30 is disposed inside the cushion side frame 10 in the left-right direction, so that the vehicle seat S can be prevented from becoming large in size in the left-right direction.

[0085] Since the first plate-shaped portion 31 is positioned further outward in the left-right direction than the second plate-shaped portion 32, the cushion side frame 10 can be positioned further inward in the left-right direction than, for example, when the first plate-shaped portion is positioned in the same position in the left-right direction as the second plate-shaped portion, thereby preventing the vehicle seat S from becoming larger in the left-right direction.

[0086] By having the weak portion 33 in the bracket 30, the bracket 30 can be deformed starting from the weak portion 33 in the event of a collision, and therefore the bracket 30 can absorb the impact.

[0087] Since the fragile portion 33 does not protrude outward in the left-right direction from the outer surface 31F on the outside of the left-right direction of the first plate-shaped portion 31, the vehicle seat S can be prevented from becoming larger in the left-right direction compared to, for example, a configuration in which the fragile portion protrudes outward in the left-right direction from the outer surface on the outside of the left-right direction of the first plate-shaped portion.

[0088] As shown in FIG. 7, the fragile portion 33 extends from the front end to the rear end of the bracket 30, so that the bracket 30 can be easily deformed in the event of a collision compared to, for example, a configuration in which the fragile portion does not extend to the end of the bracket.

[0089] Since the fragile portion 33 extends from the first fixed portion 32A to the second fixed portion 32B, the impact applied to the backside frame 41 during a collision is absorbed by the fragile portion 33 and then transmitted to the first fixed portion 32A and the second fixed portion 32B, thereby preventing damage to the first fixed portion 32A and the second fixed portion 32B.

[0090] Since a gap D is provided between the fragile portion 33 and the second rear end E3 of the cushion side frame 10, in the event of a collision, the bracket 30 can be deformed so that the first plate-shaped portion 31 of the bracket 30 approaches the second rear end E3 of the cushion side frame 10 (moves downward).

[0091] As shown in FIG. 4, the front pipe 20 is bent to avoid the front link 61, so there is no need to bend the link significantly as in the past, which allows the weight of the link to be reduced and ultimately prevents the weight of the vehicle seat S from increasing.

[0092] Since the front link 61 has a straight shape, the weight of the front link 61 can be reduced compared to when the front link has a bent shape, for example, and the weight of the vehicle seat S can be prevented from increasing.

[0093] Since the second portion 22 of the front pipe 20 extends in the left-right direction, the vertical gap between the front link 61 and the second portion 22 can be maintained at a desired size even if the position of the front link 61 is shifted left-right from the correct position due to an installation error, as compared to when the second portion extends obliquely to the left-right direction, for example.

[0094] As shown in FIG. 3, the first axis X1, which is the rotation axis of the front link 61 relative to the cushion side frame 10, is positioned within the range W3 of the joint between the front pipe 20 and the cushion side frame 10 in the vertical direction, so the vertical width of the cushion side frame 10 can be reduced.

[0095] In the vertical direction, the width of the pipe joint portion 10A of the cushion side frame 10 is smaller than the width of the link connection portion 10B, so the weight of the cushion side frame 10 can be reduced, and the weight of the vehicle seat S can be prevented from increasing.

[0096] Since a part of the first portion 21 of the front pipe 20 does not overlap the cushion side frame 10 when viewed from the left and right direction, the cushion side frame 10 can be made smaller in the vertical direction compared with a structure in which, for example, the entire first portion overlaps the cushion side frame when viewed from the left and right direction.

[0097] As shown in FIG. 9, the flanges 12 and 13 have embossed portions PP1 and PP2, respectively, so that the rigidity of the cushion side frame 10 can be increased.

[0098] Since the first flange portion 12 has the first non-treated portion NP11 that has not been embossed, the first non-treated portion NP11 can be used as a portion that absorbs impact in the event of a collision.

[0099] Since the first processed portion PP1 has a plurality of convex portions CV formed by embossing, the plurality of convex portions CV can increase the rigidity of the first processed portion PP1.

[0100] By arranging the first non-treated portion NP11 at the rear end of the first flange portion 12, the first non-treated portion NP11 at the rear end of the cushion side frame 10 can be deformed together with the bracket 30 during a collision, and therefore the impact can be absorbed by the deformation of the bracket 30 and the first non-treated portion NP11.

[0101] Since the length from one end to the other end in the front-to-back direction of the first non-treatment portions NP11 and NP12 is shorter than the length from one end to the other end in the front-to-back direction of the first treatment portion PP1, the rigidity of the cushion side frame 10 can be increased compared to a configuration in which, for example, the length of the first treatment portion is shorter than the length of each first non-treatment portion.

[0102] Since the second processing section PP2 is disposed on the rear side of the second flange section 13, the second processing section PP2 can increase the rigidity of the rear portion of the second flange section 13 to which a large load from the occupant is applied. Also, by making the front portion of the second flange section 13 the second non-processing section NP2, the accuracy of the shape and position of holes for attaching other members to the front portion of the second flange section 13 can be increased.

[0103] Since the length from one end to the other end in the front-to-back direction of the second non-treatment section NP2 is shorter than the length from one end to the other end in the front-to-back direction of the second treatment section PP2, the rigidity of the cushion side frame 10 can be increased compared to, for example, a configuration in which the length of the second treatment section is shorter than the length of the second non-treatment section.

[0104] Since the length from one end to the other end in the front-to-rear direction of the first processing section PP1 is greater than the length from one end to the other end in the front-to-rear direction of the second processing section PP2, the rigidity of the lower part of the cushion side frame 10 can be increased.

[0105] Since the second processing section PP2 is positioned within the range of the first processing section PP1 in the front-to-rear direction, the rigidity of the cushion side frame 10 can be increased compared to, for example, a configuration in which the second processing section is positioned outside the range of the first processing section in the front-to-rear direction.

[0106] The present invention is not limited to the above-described embodiment, but can be used in various forms as exemplified below.

[0107] In the above embodiment, the first plate-shaped portion 31 is positioned further outward in the left-right direction than the second plate-shaped portion 32, but the present invention is not limited to this, and for example, the first plate-shaped portion and the second plate-shaped portion may be positioned at the same position in the left-right direction.

[0108] In the above embodiment, the bracket 30 is provided with the weak portion 33, but the present invention is not limited to this, and the bracket does not necessarily have to have a weak portion.

[0109] The structure of the front pipe 20 having the first section 21, second section 22, and third section 23 can be applied to other pipes, such as a rear pipe, as long as it is a connecting pipe that connects the left and right cushion side frames. In addition, the link is not limited to the link that constitutes the height mechanism 60, but may be any link that is rotatably connected to the cushion side frames.

[0110] The embossing process is not limited to the flanges 12, 13 of the cushion side frame 10, but may also be performed on the flanges of the back side frame, for example. In other words, the embossing process may be performed on any flange of the side frame. Furthermore, the strengthening process performed on the flanges is not limited to the embossing process, but may also be a hardening process. For example, induction hardening or laser hardening can be used as the hardening process.

[0111] The strengthening treatment applied to the flange portion only needs to be applied to at least a portion of the flange portion, and may be applied to the entire flange portion, for example. In other words, the flange portion may have only a treated portion and no untreated portion. Furthermore, the strengthening treatment may be applied to the base wall in addition to the flange portion.

[0112] In the above embodiment, the bent portions 12A, 13A of the flange portions 12, 13 are configured to protrude outward in the left-right direction, but the present invention is not limited to this, and the bent portions of the flange portions may be configured to be bent inward in the left-right direction rather than protruding outward in the left-right direction from the base wall.

[0113] In the above embodiment, the fragile portion 33 is configured so as not to protrude outward in the left-right direction from the outer surface 31F on the outside of the left-right direction of the first plate-shaped portion 31, but the present invention is not limited to this, and for example, the fragile portion may be bent so as to protrude outward in the left-right direction from the outer surface on the outside of the left-right direction of the first plate-shaped portion.

[0114] In the above embodiment, a vehicle seat S used in an automobile is used as an example of a vehicle seat, but the present invention is not limited to this and can also be applied to other vehicle seats, such as seats used in ships and aircraft.

[0115] The elements described in the above-described embodiment and modified examples may be implemented in any combination. [Explanation of symbols]

[0116] 10 Cushion side frame 11 Base Wall 12 First flange PP1 First processing section S vehicle seat

Claims

1. A vehicle seat having a side frame, The side frame is A long, plate-shaped base wall; a first flange portion extending from one end of the base wall in a short side direction in a direction intersecting the base wall, The first flange portion is A first processing section that has been subjected to a strengthening treatment by quenching or embossing; a first non-treated portion that has not been subjected to the strengthening treatment, The side frames are cushion side frames extending in the front-rear direction, the first flange portion is disposed at a lower end of the base wall, the first non-treated portion includes a rear end of the first flange portion, The vehicle seat, wherein the first processing portion is disposed in front of the first non-processing portion.

2. 2. The vehicle seat according to claim 1, wherein the length from one end to the other end in the front-rear direction of the first non-treated portion is shorter than the length from one end to the other end in the front-rear direction of the first treated portion.

3. the side frame has a second flange portion extending from an upper end of the base wall in a direction intersecting the base wall, The second flange portion is 3. The vehicle seat according to claim 1, further comprising a second processed portion to which the reinforcement treatment has been applied.

4. the second flange portion has a second non-treated portion that is not subjected to the strengthening treatment, the second processing section includes a rear end of the second flange section, The vehicle seat according to claim 3 , wherein the second non-treatment portion is disposed in front of the second treatment portion.

5. 5. The vehicle seat according to claim 4, wherein the length from one end to the other end in the front-rear direction of the second non-treated portion is shorter than the length from one end to the other end in the front-rear direction of the second treated portion.

6. The vehicle seat according to any one of claims 3 to 5, characterized in that the length from one end to the other end in the fore-and-aft direction of the first processing section is greater than the length from one end to the other end in the fore-and-aft direction of the second processing section.

7. 7. The vehicle seat according to claim 6, wherein the second processing portion is disposed within a range of the first processing portion in the front-rear direction.

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