Vehicle seats

Abstract

To provide a vehicle seat that can improve rigidity of a seat cushion side frame against a load generated at the time of rear end collision while achieving weight saving.SOLUTION: A vehicle seat 10 has: a recliner 18; a rear pipe 26 extending in a seat width direction at a rear part of a seat cushion frame 14; and a seat cushion side frame 20 comprising a recliner attachment part 38 which extends in a cross direction at a seat width direction end part of the seat cushion frame 14, and to which the recliner 18 is attached, a rear pipe connection part 28 to which the seat width direction end part of the rear pipe 26 is connected, and a projection part 56 which extends in the cross direction across an axis line that connects a center of the recliner attachment part 38 and a center of the rear pipe connection part 28 between the recliner attachment part 38 and the rear pipe connection part 28 in a side view, extends in a direction separating from the recliner 18 as approaching a front side from the axis line, and is projected in the seat width direction.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, weight reduction has been demanded for vehicle seats. Weight reduction can be achieved by reducing the plate thickness of the frame that constitutes the skeleton of the vehicle seat. However, when the plate thickness is reduced, the rigidity decreases accordingly. Generally, the load input to the seat back during a rear collision is transmitted from the seat back side frame to the seat back side frame via the recliner.

[0003] Patent Document 1 below discloses a base bracket that connects an arm plate (seat back side frame) and a seat cushion side (seat cushion side frame). In a vehicle seat having this base bracket, the load input to the seat back during a rear collision is transmitted from the seat back side frame to the base bracket via the recliner.

[0004] This base bracket has beads formed at positions that do not overlap with the recliner of the extending portion extending rearward. With this bead, the rigidity of the base bracket is increased without increasing the weight. Also, by providing a portion with inferior strength between the recliner and the bead, this portion with inferior strength is deformed during a rear collision, and the load applied to the recliner is released to the base bracket.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in a base bracket like the one in Patent Document 1 mentioned above, or in a seat cushion side frame to which a recliner is attached without a base bracket, if the plate thickness is constant, its rigidity is proportional to the distance of the load transmission path in the front-rear direction.

[0007] However, in the seat cushion side frame, the area where the recliner is attached is more rigid than other parts, and deformation is more likely to occur around this area. As a result, the seat cushion side frame deforms around the area where the recliner is attached before its load-bearing capacity in the front-to-back direction is fully utilized. Therefore, there is room for improvement in vehicle seats to reduce weight while increasing the rigidity of the seat cushion side frame against the load generated during a rear-end collision.

[0008] The present invention aims to provide a vehicle seat that, in consideration of the above facts, can reduce weight while improving the rigidity of the seat cushion side frame against loads generated during a rear-end collision. [Means for solving the problem]

[0009] The vehicle seat according to claim 1 comprises: a recliner that angle-adjustably connects a seat back that supports the back of a seated occupant to a seat cushion that supports the buttocks and shins of a seated occupant; a rear pipe extending in the seat width direction at the rear of the seat cushion frame that constitutes the skeleton of the seat cushion; a recliner mounting portion that extends in the front-rear and up-down directions at the seat width direction end of the seat cushion frame and to which the recliner is attached; a rear pipe connecting portion below the recliner mounting portion to which the seat width direction end of the rear pipe is connected; and a projection that extends in the front-rear direction between the recliner mounting portion and the rear pipe connecting portion in a side view, straddling an axis connecting the center of the recliner mounting portion and the center of the rear pipe connecting portion, and extending in a direction away from the recliner as it moves forward from the axis, and projecting in the seat width direction. , a lower flange formed by bending from the side in the sheet width direction at the lower end, a rear flange formed by bending from the side in the sheet width direction at the rear end, and a bent portion provided between the lower flange and the rear flange near the rear end of the protrusion and bent in a direction that is convex in the sheet width direction and toward the front,It has a seat cushion side frame equipped with a seat cushion side frame.

[0010] According to the present invention as described in claim 1, in the event of a rear-end collision of a vehicle, a load is applied to the seat back from the seated occupant in a rearward direction. Here, since the seat back and the seat cushion are connected by a recliner, the load applied to the seat back is transmitted to the seat cushion side frame via the recliner mounting portion.

[0011] When the thickness of the seat cushion side frame is constant, its rigidity is proportional to the distance of the load transmission path. Generally, the load transmitted to the seat cushion side frame is transmitted in the front-to-back direction along the outer circumference of the highly rigid recliner.

[0012] On the other hand, the seat cushion side frame of the vehicle seat according to the present invention has a protruding portion that extends in the seat width direction, so the load is transmitted along this protruding portion. In a side view, this protruding portion extends in the longitudinal direction across the axis connecting the center of the recliner mounting portion and the center of the rear pipe connection portion between the recliner mounting portion and the rear pipe connection portion, and extends in a direction away from the recliner as it moves forward from the axis. As a result, the load transmitted in the longitudinal direction of the seat cushion side frame can be suppressed from being transmitted along the recliner on the front side of the recliner, and the longitudinal load transmission path can be lengthened. Therefore, the seat cushion side frame can fully utilize its longitudinal load-bearing capacity, and its rigidity is improved. Furthermore, according to the present invention as described in claim 1, the bent portion is provided between the lower flange and the rear flange near the rear end of the protruding portion and is bent in a direction that is convex in the seat width direction and toward the front. Therefore, in the event of a rear collision, the load transmitted downward from the recliner at the rear end of the seat cushion side frame is transmitted toward the front of the seat starting from this bent portion. Here, since the bent portion is formed near the rear end of the protruding portion, the load is smoothly transmitted from the bent portion to the protruding portion. Thus, the load can be reliably transmitted along the desired path.

[0013] The vehicle seat according to claim 2 is, in the invention described in claim 1, The bent portion includes a front portion that is triangular in side view and is formed spanning the side portion and the lower flange of the seat cushion side frame, and a rear portion that is triangular in side view and is formed spanning the side portion and the rear flange. .

[0015] The vehicle seat according to claim 3 is, Claim 1 or In the invention described in claim 2, The aforementioned protruding portion is formed to bulge out in the width direction of the sheet and is U-shaped when viewed in cross-section from the front or back direction.

[0016] According to the present invention described in claim 3, The protruding portion can be formed simply by press-forming a panel-shaped frame. Furthermore, compared to forming the protruding portion by joining additional members, the seat cushion side frame can be made lighter, and the number of parts and labor can be reduced.

[0017] The vehicle seat according to the present invention described in claim 4, in the invention described in claim 3, the lower end at the front end of the protruding portion is formed below the lower end of the recliner and in front of the front end of the recliner.

[0018] According to the present invention described in claim 4, in the seat cushion side frame, the load transmitted forward along the lower side of the protruding portion can be transmitted to a position further away from the recliner.

[0019] The vehicle seat according to the present invention described in claim 5, claim 1 In the invention described in, the protruding portion is formed below the tangent line at the intersection of the axis and the outer peripheral surface of the recliner in a side view.

[0020] According to the present invention described in claim 5, in the seat cushion side frame, it is possible to further suppress the transmission of the load along the recliner.

[0021] The vehicle seat according to the present invention described in claim 6, in the invention described in claim 2, the protruding portion is formed in an arc shape that protrudes toward the recliner mounting portion side in a side view.

[0022] According to the present invention described in claim 6, in the seat cushion side frame, the load input from the bent portion to the rear end portion of the protruding portion is smoothly transmitted along the arc-shaped protruding portion. Therefore, the load can be reliably transmitted along a desired path.

[0025] Claim 7 The vehicle seat according to the present invention described in has, in the invention described in claim 1, a lifter mechanism for supporting the seat cushion so as to be movable up and down.

[0026] Claim 7According to the present invention described in [reference], since the load transmitted from the seat back during a rear-end collision is absorbed by the seat cushion side frame, the load transmission to the lifter mechanism can be suppressed.

Effect of the Invention

[0027] As described above, the vehicle seat according to the present invention described in claim 1 has an excellent effect that the rigidity of the seat cushion side frame can be improved against the load generated during a rear-end collision while achieving weight reduction.

[0028] Also, claim 1 The vehicle seat according to the present invention described in [reference] has an excellent effect that it can efficiently absorb the load generated during a rear-end collision.

[0029] The vehicle seat according to the present invention described in claim 3 To further reduce manufacturing costs while making it even lighter. has an excellent effect that it can

[0030] The vehicle seat according to the present invention described in claim 4 has an excellent effect that the rigidity of the seat cushion side frame can be further improved.

[0031] The vehicle seat according to the present invention described in claim 5 has an excellent effect that the rigidity of the seat cushion side frame can be further improved.

[0032] The vehicle seat according to the present invention described in claim 6 has an excellent effect that it can absorb the load generated during a rear-end collision more efficiently.

[0034] Claim 7 The vehicle seat according to the present invention described in [reference] has an excellent effect that it can prevent damage to the lifter mechanism.

Brief Description of the Drawings

[0035] [Figure 1] It is a perspective view of the vehicle seat according to the present embodiment as viewed from the left rear of the seat. [Figure 2] Figure 1 is an enlarged view of the main part of the seat cushion side frame in a vehicle seat, seen from the inside in the width direction of the seat. [Figure 3] Figure 2 shows the main part of the seat cushion side frame as viewed from the outside in the seat width direction, and is a side view illustrating the load-bearing capacity of the seat cushion side frame in the front-rear direction. [Figure 4] Figure 2 is a side view showing the load transfer path of the seat cushion side frame. [Figure 5] This is a side view that provides a more detailed explanation of the load transfer path shown in Figure 4. [Figure 6] Figure 2 is a side view showing the load transmission path when the arc bead of the seat cushion side frame is not provided, and it corresponds to Figure 4. [Modes for carrying out the invention]

[0036] The following describes a vehicle seat 10 according to one embodiment of the present invention, using Figures 1 to 6. The arrows FR, UP, LH, and RH shown in each figure indicate the front side, upper side, left side in the width direction, and right side of the vehicle seat 10, respectively. Furthermore, in the following description, unless otherwise specified, the directions front / back, up / down, and left / right refer to the front / back direction of the seat, the up / down direction of the seat, and the left / right direction (width direction), respectively. First, the overall configuration of the vehicle seat 10 will be described using Figure 1, and then the seat cushion side frame 20, which is a key part of this embodiment, will be described in detail using Figures 2 to 6.

[0037] [Overall configuration of vehicle seat 10] The vehicle seat 10 shown in Figure 1 is, for example, the driver's seat of a left-hand drive vehicle or the passenger seat of a right-hand drive vehicle, and is located on the left side of the vehicle interior. The vehicle seat 10 is a so-called belt-in seat, with a seat belt device (not shown) built in. The front-to-back, left-to-right, and up-and-down directions of the vehicle seat 10 coincide with the front-to-back, left-to-right, and up-and-down directions of the vehicle, respectively. The vehicle seat may also be located on the right side of the vehicle interior, or as a rear seat located at the rear of the vehicle interior.

[0038] (Seat frame 12) The vehicle seat 10 includes a seat frame 12, which is a skeletal member made of, for example, metal or resin. This seat frame 12 is composed of a seat cushion frame 14 that extends in the front-rear direction and the seat width direction, and a seat back frame 16 that extends in the up-down direction and the seat width direction.

[0039] The seat cushion frame 14 constitutes the framework of the seat cushion, which is configured to support the buttocks and thighs of a seated occupant. On the other hand, the seat back frame 16 constitutes the framework of the seat back, which is configured to support the occupant's back, and is rotatably connected to the rear of the seat cushion frame 14 by a recliner 18, which will be described later.

[0040] The seat frame 12 of the vehicle seat 10 is fitted with a pad (not shown) molded from a foam material such as urethane foam. This pad is covered with a surface (not shown) made of multiple surface pieces sewn together from fabric, knit material, synthetic leather, leather, etc.

[0041] (Seat cushion frame 14) The seat cushion frame 14 is provided with a pair of seat cushion side frames 20 (hereinafter referred to as "Cu-Side frames 20") that extend in the front-rear direction and the up-down direction, respectively, at both ends in the seat width direction. The Cu-Side frames 20 are formed in a substantially L-shape, with the front-rear direction as the longitudinal direction and the up-down direction as the short direction when viewed from the side.

[0042] Furthermore, the seat cushion frame 14 is composed of a front frame 22 that connects the front ends of the left and right Cu-Side frames 20 in the seat width direction, and a cylindrical rear pipe 26 that connects the rear ends 24 of the left and right Cu-Side frames 20 in the seat width direction. Both ends of this rear pipe 26 are fixed to a rear pipe connection portion 28 that is circular in side view and formed on the lower part of the rear end 24 of the Cu-Side frame 20. In the rear pipe connection portion 28, the center of the rear pipe 26 and the center P of the rear pipe connection portion 28 coincide in side view.

[0043] (Seat back frame 16) Furthermore, the seat back frame 16 includes a pair of back side frames 30 that extend vertically at both ends in the seat width direction, a rear seat panel 32 that connects the lower ends of the pair of back side frames 30 in the seat width direction, and an upper frame (not shown) that connects the upper ends of the pair of back side frames 30 in the seat width direction.

[0044] (Reclining chair 18) Here, the rear portion 24 of the left Cu-Side frame 20 has an extension portion 36 that extends upward from the front portion 34 of the Cu-Side frame 20. A reclining mounting portion 38, which is roughly circular in side view, is formed on the extension portion 36, and a disc-shaped reclining seat 18 is attached to it from the inside in the seat width direction.

[0045] The lower end of the left backside frame 30 is attached to the recliner mounting portion 38 on the Cu-Side frame 20 via the recliner 18. This allows the seat back frame 16 to be angle-adjustable relative to the seat cushion frame 14. Although the vehicle seat 10 has been described as having a recliner 18 on the left side, it is not limited to this configuration; it may also have a recliner 18 on the right side, or on both sides in the seat width direction.

[0046] (Lifter mechanism 70) The vehicle seat 10 is further equipped with a lifter mechanism 70 that supports the seat cushion frame 14 so that it can be raised and lowered. The lifter mechanism 70 consists of a front riser 40 that supports the front of the left Cu-Side frame 20 and a rear riser 42 that supports the rear of the left Cu-Side frame 20. The front riser 40 and the rear riser 42 are each connected to the lower part of the Cu-Side frame 20 by a link mechanism (not shown). The seat frame 12 is configured to be raised upward and forward relative to the front riser 40 and the rear riser 42 by this lifter mechanism 70. Note that the front riser and rear riser on the right side in the seat width direction have the same configuration as the front riser 40 and the rear riser 42, respectively, so their description is omitted.

[0047] (Slide rail 44) Furthermore, the vehicle seat 10 is equipped with a pair of left and right slide rails 44 that extend in the front-rear direction. These slide rails 44 are fixed to the vehicle floor. The lower ends of the front riser 40 and the rear riser 42 are engaged with the left slide rail 44, respectively, and are configured to slide in the front-rear direction. As a result, the seat frame 12 is movable in the front-rear direction relative to the vehicle floor. Note that the vehicle seat 10 does not necessarily have slide rails 44; for example, the seat cushion frame 14 may be fixed to the floor via a base.

[0048] [Main part configuration] Next, the main parts of the Cu-Side frame 20 of the vehicle seat 10 according to this embodiment will be described using Figures 2 and 3. As shown in Figure 2, in the rear part 24 of the Cu-Side frame 20, the rear pipe connection part 28 is formed below the recliner mounting part 38. Furthermore, the rear pipe connection part 28 is formed such that the center P of the rear pipe connection part 28 (see Figure 3) is located forward of the center Q of the recliner mounting part 38 (see Figure 3). Note that the center Q of the recliner mounting part 38 coincides with the center of the recliner 18.

[0049] (Front upper flange 46) On the upper side of the Cu-Side frame 20, a front upper flange 46 is formed at the end in front of the recliner mounting portion 38, which is curved in a direction that is convex downward and rearward when viewed from the side. The front upper flange 46 is bent inward in the seat width direction from the side portion 48 of the Cu-Side frame 20.

[0050] (Lower flange 50 and rear flange 52) Furthermore, a lower flange 50 is formed at the lower end of the Cu-Side frame 20, which is bent inward in the sheet width direction from the side portion 48 of the Cu-Side frame 20. Similarly, a rear flange 52 is formed at the rear end of the Cu-Side frame 20, which is bent inward in the sheet width direction from the side portion 48 of the Cu-Side frame 20.

[0051] (Energy-absorbing bead 54) Here, in the rear portion 24 of the Cu-Side frame 20, an energy-absorbing bead 54 (hereinafter referred to as "EA bead 54") is formed between the lower flange 50 and the rear flange 52, as a bent portion that is bent in a direction that protrudes inward and forward in the sheet width direction.

[0052] The EA bead 54 is composed of a front portion 54A that is roughly triangular in side view and is formed across the side portion 48 and the lower flange 50, and a rear portion 54B that is roughly triangular in side view and is formed across the side portion 48 and the rear flange 52. The orientation and shape of the EA bead 54 are not limited to those described above, and for example, it may be bent between the lower flange and the rear flange, which are bent outward in the sheet width direction, so as to protrude outward in the sheet width direction.

[0053] (Circular bead 56) Furthermore, at the rear portion 24 of the Cu-Side frame 20, an arc bead 56 is formed as an arc-shaped projection that is convex toward the reclining mounting portion 38 when viewed from the side, below the reclining mounting portion 38 and above the rear pipe connection portion 28. This arc bead 56 bulges inward in the seat width direction and is formed in a roughly U-shape that opens outward in the seat width direction when viewed in cross-section from the front-rear direction. The arc bead 56 may also bulge outward in the seat width direction.

[0054] As shown in Figure 3, the arc bead 56 extends in the longitudinal direction in a side view between the recliner mounting portion 38 and the rear pipe connection portion 28, straddling the axis L1 connecting the center Q of the recliner mounting portion 38 and the center P of the rear pipe connection portion 28. In other words, the front end portion 58 of the arc bead 56 is formed on the side of axis L1, and the rear end portion 60 of the arc bead 56 is formed on the side of axis L1.

[0055] Furthermore, the arc bead 56 is formed below the tangent line L2 at the intersection R between the axis L1 and the outer circumferential surface 18A of the recliner 18 in a side view. In addition, the arc bead 56 extends in a direction away from the recliner 18 and the recliner mounting portion 38 as it moves forward from the axis L1 in a side view.

[0056] The lower end 58A of the front end 58 of the arc bead 56 is equal to the front end of the inner arc 62 that forms the lower end of the arc bead 56, and is formed below the lower end of the recliner 18 and in front of the front end of the recliner 18.

[0057] On the other hand, the lower end 60A of the rear end 60 of the arc bead 56 is equal to the rear end of the inner arc 62 that forms the lower end of the arc bead 56. This lower end 60A of the rear end 60 of the arc bead 56 is formed near the front upper tip 54D of the valley 54C formed between the front part 54A and the rear part 54B of the EA bead 54. In other words, the EA bead 54 is formed below the rear end 60 of the arc bead 56, but near the rear end 60 of the arc bead 56.

[0058] (Operation and effects of this embodiment) Next, the operation and effects of this embodiment will be described.

[0059] According to the vehicle seat 10 of this embodiment, in the event of a rear-end collision of the vehicle, a load is applied to the seat back frame 16 (see Figure 1) from the seated occupant in a rearward direction. Since the seat back frame 16 and the seat cushion frame 14 are connected by a recliner 18, the load applied to the seat back frame 16 is transmitted to the Cu-Side frame 20 via the recliner mounting portion 38.

[0060] When the plate thickness of the Cu-Side frame 20 is constant, its rigidity is proportional to the distance of the load transmission path W (see Figure 3) connecting the front upper flange 46 and the rear flange 52. As shown in Figure 6, in a vehicle seat 80 equipped with a cushion side frame 82 that does not have an arc bead, the load transmitted from the seat back frame 84 to the cushion side frame 82 via the recliner 86 and the recliner mounting portion 88 is transmitted in the longitudinal direction along the outer circumference of the highly rigid recliner 86. As a result, the longitudinal load transmission path Y becomes shorter than the desired distance, and deformation occurs around the recliner mounting portion 88 before the longitudinal load-bearing capacity of the cushion side frame 82 is fully utilized.

[0061] On the other hand, as shown in Figure 4, the Cu-Side frame 20 of the vehicle seat 10 according to this embodiment has an arc bead 56 that protrudes inward in the seat width direction, so the load is transmitted along this arc bead 56. The load transmitted along the arc bead 56 is transmitted from the front end 58 of the arc bead 56 to the front upper flange 46 (see arrow X).

[0062] As described above, the arc bead 56 extends away from the recliner 18 as it moves forward from the axis L1 (see Figure 5). This suppresses the transmission of loads transmitted in the longitudinal direction of the Cu-Side frame 20 along the recliner 18 on the front side of the recliner 18. Therefore, the longitudinal load transmission path X can be lengthened. As a result, the Cu-Side frame 20 can fully utilize its longitudinal load-bearing capacity, thus improving its rigidity. Consequently, the Cu-Side frame 20 can be made lighter while improving its rigidity against loads generated during rear collisions.

[0063] Furthermore, as shown in Figure 5, since the EA bead 54 is formed between the lower flange 50 and the rear flange 52 of the Cu-Side frame 20, in the event of a rear collision, the load transmitted downward from the recliner 18 at the rear 24 of the Cu-Side frame 20 is transmitted to the front of the seat starting from this EA bead 54 (see arrow A). Here, since the EA bead 54 is formed near the rear end 60 of the arc bead 56, the load is smoothly transmitted from the EA bead 54 to the arc bead 56. Therefore, the load can be reliably transmitted along the desired load transmission path X (see Figure 4).

[0064] Furthermore, since the EA bead 54 is formed below the rear end portion 60 of the arc bead 56, the load transmitted from the EA bead 54 to the arc bead 56 is transmitted forward along the inner arc 62 that forms the lower end of the arc bead 56. Therefore, in the Cu-Side frame 20, the transmission of load along the recliner 18, which is provided above the arc bead 56, can be further suppressed.

[0065] Furthermore, since the lower end 58A of the front end 58 of the arc bead 56 is formed below the lower end of the recliner 18 and in front of the front end of the recliner 18, the load transmitted forward along the inner arc 62 of the arc bead 56 can be transmitted to a position further away from the recliner 18 in the Cu-Side frame 20.

[0066] Furthermore, since the arc bead 56 is formed below the tangent line L2 at the intersection R between the axis L1 and the outer circumferential surface 18A of the recliner 18 in a side view, the transmission of load along the recliner 18 can be further suppressed in the Cu-Side frame 20.

[0067] Furthermore, since the arc bead 56 is arc-shaped and convex toward the recliner mounting portion 38 when viewed from the side, the load applied from the EA bead 54 to the rear end 60 of the arc bead 56 in the Cu-Side frame 20 is smoothly transmitted forward along the arc bead 56 (see Figure 4). Therefore, the load can be reliably transmitted along the desired path.

[0068] Furthermore, since the arc bead 56 is formed by bulging in the sheet width direction, the arc bead 56 can be formed simply by press-forming the panel-shaped frame. In addition, compared to the case where additional members are joined to form the arc bead 56, the Cu-Side frame 20 can be made lighter and the number of parts and man-hours can be reduced.

[0069] Furthermore, the load transmitted from the backside frame 30 of the seat back frame 16 during a rear-end collision is absorbed by the Cu-Side frame 20, thus suppressing the transmission of load to the lifter mechanism. In particular, in a belt-in seat like the vehicle seat 10 of this embodiment, the load input to the seat frame 12 is large during a frontal collision, so it is conceivable to increase the strength of the seat frame 12. In this case, the amount of deformation of the seat frame 12 becomes smaller, so the load input to the mechanical components increases. The Cu-Side frame 20 of the vehicle seat 10 can suppress the transmission of load to the mechanical components during a rear-end collision, even with such a high-strength seat frame 12.

[0070] [Supplementary explanation of the above embodiment] In the above embodiment, the front-rear direction of the vehicle seat 10 was described as coinciding with the front-rear direction of the vehicle. However, the embodiment is not limited to this, and for example, the vehicle seat 10 may be positioned facing backward with respect to the direction of travel of the vehicle. In this case, the same effects and advantages as in the above embodiment can be obtained during a frontal collision of the vehicle.

[0071] Furthermore, although the above embodiment described the EA bead 54 as being formed below the rear end portion 60 of the arc bead 56 and between the lower flange 50 and the rear flange 52 of the Cu-Side frame 20, it is not limited to this. For example, the EA bead 54 may be formed on the rear flange 52 behind the arc bead 56. Also, instead of forming a bend, for example, the arc bead 56 may extend to the rear end or lower end of the Cu-Side frame 20.

[0072] Furthermore, in the above embodiment, the lower end 58A of the front end 58 of the arc bead 56 was described as being formed below the lower end of the recliner 18 and in front of the front end of the recliner 18. However, the embodiment is not limited to this, and for example, the lower end of the front end of the bent portion may be formed above the lower end of the recliner 18.

[0073] Furthermore, in the above embodiment, the arc bead 56 was described as being formed below the tangent line L2 at the intersection R of the axis L1 and the outer circumferential surface 18A of the recliner 18 in a side view, but a part of the protrusion may be formed above this tangent line L2.

[0074] Furthermore, although the above embodiment describes an arc-shaped bead 56 that is convex towards the recliner mounting portion 38 when viewed from the side, the invention is not limited to this, and for example, the protruding portion may be formed in a straight line when viewed from the side.

[0075] Furthermore, although the above embodiment described the arc bead 56 as being formed to bulge in the sheet width direction, it is not limited to this, and for example, the protruding portion may be formed with increased thickness compared to other parts by joining an additional member to the inside or outside of the Cu-Side frame 20 in the sheet width direction.

[0076] Furthermore, although the above embodiment was described as having a lifter mechanism 70, the vehicle seat is not limited to this, and the vehicle seat does not need to have a lifter mechanism.

[0077] The following additional information is disclosed regarding the embodiments described above.

[0078] (Note 1) A recliner that connects the seatback, which supports the back of the seated occupant, to the seat cushion, which supports the buttocks and shins of the seated occupant, in an angle-adjustable manner, A rear pipe extending in the seat width direction at the rear of the seat cushion frame which constitutes the frame of the aforementioned seat cushion, A seat cushion side frame comprising: a seat cushion frame extending in the front-rear and up-down directions at the seat width direction end of the seat cushion frame, to which the recliner is attached; a rear pipe connection portion below the recliner mounting portion to which the seat width direction end of the rear pipe is connected; and a protruding portion that, in a side view, extends in the front-rear direction between the recliner mounting portion and the rear pipe connection portion, straddling an axis connecting the center of the recliner mounting portion and the center of the rear pipe connection portion, and extending in a direction away from the recliner as it moves forward from the axis, and protruding in the seat width direction; A vehicle seat having the following features. (Note 2) The seat cushion side frame further has a bent portion formed near the rear end of the protruding portion at the rear end or lower end of the seat cushion side frame and bent in a direction that is convex in the seat width direction. Vehicle seats as described in Appendix 1. (Note 3) The bent portion is formed below the rear end of the protruding portion. Vehicle seats as described in Appendix 2. (Note 4) The lower end of the front end of the protruding portion is formed below the lower end of the recliner and in front of the front end of the recliner. Vehicle seats as described in Appendix 3. (Note 5) The aforementioned protrusion is formed below the tangent line at the intersection of the axis and the outer surface of the recliner in a side view. A vehicle seat as specified in any one of the appendices 1 to 4. (Note 6) The aforementioned protruding portion is shaped like an arc, convex towards the recliner mounting portion when viewed from the side. Vehicle seats as specified in any one of the appendices 2 to 5. (Note 7) The aforementioned protrusion is formed to bulge out in the sheet width direction. A vehicle seat as specified in any one of the appendices 1 to 6. (Note 8) The seat cushion further has a lifter mechanism that supports it so that it can be raised and lowered. Vehicle seats as specified in any one of the appendices 1 to 7. [Explanation of Symbols]

[0079] 10 Vehicle seats 14 Seat cushion frame 18 Reclining seats 18A Outer surface 20 Seat Cushion Side Frame 26 Rear pipe 28 Rear pipe connection 38 Reclining seat mounting section 54 Energy-absorbing bead (bent section) 56. Circular bead (protruding part) 58. Front end of the arc bead (front end of the protruding part) 58A Lower end at the front end of the arc bead (lower end at the front end of the protruding portion) 60. Rear end of the arc bead (rear end of the protruding part) 70 Lifter Mechanism L1 axis L2 tangent P Rear pipe connection point center Q Center of the recliner connection R intersection

Claims

1. A recliner that connects the seatback, which supports the back of the seated occupant, to the seat cushion, which supports the buttocks and shins of the seated occupant, in an angle-adjustable manner, A rear pipe extending in the seat width direction at the rear of the seat cushion frame which constitutes the frame of the aforementioned seat cushion, A seat cushion side frame comprising: a seat cushion frame extending in the front-rear and up-down directions at the seat width direction end, to which the recliner is attached; a rear pipe connection portion below the recliner mounting portion to which the seat width direction end of the rear pipe is connected; a projection portion extending in the front-rear direction in a side view between the recliner mounting portion and the rear pipe connection portion, straddling an axis connecting the center of the recliner mounting portion and the center of the rear pipe connection portion, extending in a direction away from the recliner as it moves forward from the axis, and projecting in the seat width direction; a lower flange formed at the lower end by bending from the side in the seat width direction; a rear flange formed at the rear end by bending from the side in the seat width direction; and a bent portion provided between the lower flange and the rear flange near the rear end of the projection portion, and bent in a direction that is convex in the seat width direction and forward. A vehicle seat having the following features.

2. The bent portion is configured to include a front portion that is triangular in side view and is formed spanning the side portion and the lower flange of the seat cushion side frame, and a rear portion that is triangular in side view and is formed spanning the side portion and the rear flange. A vehicle seat according to claim 1.

3. The protruding portion is formed to bulge out in the sheet width direction and is formed in a U-shape when viewed in cross-section from the front and rear directions. A vehicle seat according to claim 1 or claim 2.

4. The lower end of the front end of the protruding portion is formed below the lower end of the recliner and in front of the front end of the recliner. A vehicle seat according to claim 3.

5. The aforementioned protrusion is formed below the tangent line at the intersection of the axis and the outer surface of the recliner in a side view. A vehicle seat according to claim 1.

6. The aforementioned protruding portion is shaped like an arc that protrudes towards the recliner mounting portion when viewed from the side. A vehicle seat according to claim 2.

7. The seat cushion further comprises a lifter mechanism that supports the seat cushion so that it can be raised and lowered. A vehicle seat according to claim 1.

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