Vehicle seat

Abstract

To provide a seat for a vehicle which can suppress damage of a weld part of a leg while avoiding increase in a weld amount.SOLUTION: A seat for a vehicle includes a leg for connecting a cushion frame and a slide device. The leg has a first connection bracket, a second connection bracket, and a third connection bracket for connecting the first connection bracket and the second connection bracket in a sheet longitudinal direction. The third connection bracket has a plate-like reinforcement plate part, and a slit extending upward from the lower end of the reinforcement plate part. A first end constituting the edge behind the slit in the reinforcement plate part is welded to the first connection bracket. A second end constituting the edge ahead of the slit in the reinforcement plate part is not fixed to the first connection bracket.SELECTED DRAWING: Figure 5

Description

Technical Field

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

Background Art

[0002] In a vehicle seat, a configuration including a slide device and a seat belt housed in the vehicle seat is known (see Patent Document 1). In this configuration, a cushion frame and a slide device are connected by legs.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Depending on the form of the vehicle seat, in the seat width direction, a leg may be disposed between a retractor that winds up the seat belt and a buckle to which a fitting of the seat belt is attached when the seat belt is used.

[0005] In such an arrangement, when a load for lifting the buckle is input to the buckle via the seat belt, the leg is pulled in the seat width direction. As a result, cracks occur in the welded portion of the leg.

[0006] To prevent this crack, if the welding length or the number of weld points is increased to reinforce the leg, the mass and the number of processing points of the vehicle seat increase. Further, since the leg becomes less deformable, the load transmitted to the slide device increases, and the slide device becomes more likely to deform.

[0007] One aspect of the present disclosure aims to provide a vehicle seat capable of suppressing damage to the welded portion of the leg while avoiding an increase in the amount of welding.

Means for Solving the Problem

[0008] One aspect of the present disclosure is a vehicle seat (1) including a seat cushion (2) and a seat back (3), a cushion frame (4) supporting the seat cushion (2), a back frame (5) supporting the seat back (3), a slide device (6A) slidably supporting the cushion frame (4), a leg (7A) connecting the cushion frame (4) and the slide device (6A), a seat belt (10), a retractor (11) fixed to the back frame (5) and winding up the seat belt (10), and a buckle (12) fixed to the cushion frame (4) and to which a fitting of the seat belt (10) is detachably attached.

[0009] The leg (7A) is disposed between the retractor (11) and the buckle (12) in the seat width direction, and includes a first connecting bracket (71) having an upper portion fixed to the cushion frame (4) and a lower portion fixed to the slide device (6A), a second connecting bracket (72) disposed in front of the seat of the first connecting bracket (71) and having an upper portion fixed to the cushion frame (4) and a lower portion fixed to the slide device (6A), and a third connecting bracket (73) connecting the first connecting bracket (71) and the second connecting bracket (72) in the seat front-rear direction.

[0010] The third connecting bracket (73) includes a plate-shaped reinforcing plate portion (731) that is overlapped with the first connecting bracket (71) and the second connecting bracket (72) in the seat width direction, and a slit (735) that extends upward from the lower end portion of the reinforcing plate portion (731). A first end portion (731A) that constitutes the rear edge of the slit (735) in the seat of the reinforcing plate portion (731) is welded to the first connecting bracket (71). A second end portion (731B) that constitutes the front edge of the slit (735) in the seat of the reinforcing plate portion (731) is not fixed to the first connecting bracket (71).

[0011] According to such a configuration, the stress generated by the input that lifts the buckle (12) is absorbed by the first end portion (731A) and the second end portion (731B) that are split in the longitudinal direction of the seat through the slit (735).

[0012] That is, when the first end portion (731A) welded to the first connecting bracket (71) deforms toward the retractor (11) side, and the second end portion (731B) separated from the first connecting bracket (71) deforms toward the buckle (12) side, the stress is absorbed. As a result, damage to the welded portion of the leg (7A) can be suppressed while avoiding reinforcement of the leg (7A) by increasing the welding length or the number of weld points.

[0013] In one aspect of the present disclosure, the slit (735) may have an extension portion (735A) continuous from the lower end portion of the reinforcing plate portion (731), and a tip portion (735B) having a width larger than that of the extension portion (735A) and having an arcuate edge. According to such a configuration, since the stress is dispersed by the tip portion (735B), the occurrence of cracks in the third connecting bracket (73) can be suppressed.

[0014] In one aspect of the present disclosure, the amount of protrusion of the tip portion (735B) forward of the seat with respect to the extension portion (735A) may be larger than the amount of protrusion of the tip portion (735B) rearward of the seat with respect to the extension portion (735A). According to such a configuration, the welding length between the first end portion (731A) and the first connecting bracket (71) at the rear edge of the seat of the slit (735) can be increased.

[0015] Note that the reference numerals in the above parentheses are examples showing the correspondence with the specific configurations and the like described in the embodiments to be described later, and the present disclosure is not limited to the specific configurations and the like indicated by the reference numerals in the above parentheses.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

[0017] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First Embodiment] [1-1. Configuration] The vehicle seat 1 shown in FIG. 1 includes a seat cushion 2, a seat back 3, a cushion frame 4, a back frame 5, a first slide device 6A, a second slide device 6B, a first leg 7A, a second leg 7B, a seat belt 10, a retractor 11, and a buckle 12.

[0018] The vehicle seat 1 is used as a seat seat of a passenger car. Specifically, the vehicle seat 1 constitutes, for example, a right seat and a center seat arranged in the second row and subsequent rows of a passenger car.

[0019] In addition, the directions in the following description and each drawing mean the directions in a state where the vehicle seat 1 is assembled to a vehicle (that is, a passenger car). In the present embodiment, the seat width direction coincides with the left-right direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

[0020] The seat cushion 2 is a part for supporting the buttocks of the seated person. The seat back 3 is a part for supporting the back of the seated person. The cushion frame 4 supports the seat cushion 2. The back frame 5 supports the seat back 3.

[0021] The seat belt 10 is discharged from a retractor 11 fixed to the central portion of the back frame 5. The seat belt 10 is configured to be spanned toward a buckle 12 provided on the left side portion of the seat cushion 2 while crossing the left seating portion (i.e., the center seat) of the seat back 3 in the seat width direction.

[0022] Although not shown, the vehicle seat 1 is provided with a seat belt for the occupant of the right seating portion (i.e., the right seat) of the seat back 3 in addition to the seat belt 10 used by the occupant of the center seat.

[0023] The retractor 11 is configured to wind up the seat belt 10 and store the seat belt 10 therein. The retractor 11 is disposed on the right side of the first side frame 41 and the second side frame 42 of the cushion frame 4.

[0024] The buckle 12 is a device to which the fitting of the seat belt 10 can be detachably attached. The buckle 12 is fixed to the first side frame 41 of the cushion frame 4. By inserting the fitting attached to the seat belt 10 into the buckle 12, the seat belt 10 is worn by the occupant.

[0025] <Cushion frame> As shown in FIG. 2, the cushion frame 4 includes a first side frame 41, a second side frame 42, a third side frame 43, a first connecting rod 44, a second connecting rod 45, a movable portion 46, and a fixed bracket 47.

[0026] The first side frame 41, the second side frame 42, and the third side frame 43 each extend in the front-rear direction of the seat and are arranged apart from each other in the seat width direction.

[0027] Specifically, the first side frame 41 is arranged on the leftmost side among the three side frames. The second side frame 42 is arranged on the right side of the first side frame 41. The third side frame 43 is arranged on the right side of the second side frame 42.

[0028] The first connecting rod 44 and the second connecting rod 45 are each pipe-shaped members that connect the first side frame 41, the second side frame 42, and the third side frame 43 in the sheet width direction.

[0029] The central axes of the first connecting rod 44 and the second connecting rod 45 are parallel to the sheet width direction. The first connecting rod 44 is fixed to the rear ends of the side frames 41, 42, 43 (i.e., the connection portions with the back frame 5) by welding. The second connecting rod 45 is fixed to the side frames 41, 42, 43 by welding in front of the sheet compared to the first connecting rod 44.

[0030] The movable part 46 is connected to the first side frame 41 and the third side frame 43 so as to be swingable in the vertical direction. By swinging the movable part 46 upward, the seat cushion 2 is folded so as to overlap the seat back 3.

[0031] The fixing bracket 47 is a plate-shaped member that fixes the buckle 12 to the cushion frame 4. The fixing bracket 47 is fixed to the first connecting rod 44 by welding on the outer side (i.e., the left side) in the sheet width direction compared to the first side frame 41.

[0032] <Slide device> The first slide device 6A and the second slide device 6B each support the cushion frame 4 so as to be slidable in the sheet front-rear direction.

[0033] The first slide device 6A is connected to the cushion frame 4 (specifically, the first connecting rod 44 and the second connecting rod 45) via the first leg 7A. The first slide device 6A has a movable rail 61 (i.e., the upper rail) that slides together with the cushion frame 4, and a fixed rail 62 (i.e., the lower rail) that slidably supports the movable rail 61.

[0034] The second slide device 6B has a movable rail and a fixed rail similar to those of the first slide device 6A. The second slide device 6B is connected to the cushion frame 4 (specifically, the first connecting rod 44 and the second connecting rod 45) via the second leg 7B on the right side of the first slide device 6A.

[0035] <Leg> The first leg 7A vertically connects the cushion frame 4 and the first slide device 6A. As shown in FIGS. 3A and 3B, the first leg 7A has a first connecting bracket 71, a second connecting bracket 72, a third connecting bracket 73, and a reinforcing patch 74.

[0036] <The first connecting bracket and the second connecting bracket> The first connecting bracket 71 and the second connecting bracket 72 are arranged between the retractor 11 and the buckle 12 in the seat width direction.

[0037] Specifically, the first connecting bracket 71 and the second connecting bracket 72 are arranged between the first side frame 41 (or the fixed bracket 47) and the second side frame 42 in the seat width direction.

[0038] The first connecting bracket 71 is a plate-shaped member formed by bending. As shown in FIG. 4, the first connecting bracket 71 has a first rear wall 711, a first front wall 712, a first side wall 713, a first rear flange 714, and a first front flange 715.

[0039] The first rear wall 711 extends in the seat up-and-down direction. The thickness direction of the first rear wall 711 intersects the seat width direction. The upper part of the first rear wall 711 is fixed to the first connecting rod 44 by welding. Also, the lower part of the first rear wall 711 is fixed to the movable rail 61 by bolts and nuts.

[0040] The first front wall 712 extends in the up-and-down direction in front of the first rear wall 711 in the seat front-rear direction. The first front wall 712 faces the first rear wall 711. The upper part of the first front wall 712 is fixed to the first connecting rod 44 by welding.

[0041] The first side wall 713 connects the first rear wall 711 and the first front wall 712 in the seat front-rear direction. The thickness direction of the first side wall 713 intersects the up-and-down direction. The upper part of the first side wall 713 is fixed to the first connecting rod 44 by welding.

[0042] The first rear flange 714 is a plate-shaped part extending rearward in the seat direction from the left end of the first rear wall 711. The first rear flange 714 is fixed to the third connecting bracket 73 by welding.

[0043] The first front flange 715 is a plate-shaped part extending forward in the seat direction from the left end of the first front wall 712. The first front flange 715 is fixed to the third connecting bracket 73 by welding.

[0044] The second connecting bracket 72 is a plate-shaped member that has been bent. The second connecting bracket 72 is arranged in front of the first connecting bracket 71 in the seat front-rear direction. The second connecting bracket 72 has a second rear wall 721, a second front wall 722, a second side wall 723, and a second rear flange 724.

[0045] The second rear wall 721 extends in the seat up-and-down direction. The thickness direction of the second rear wall 721 intersects the seat width direction.

[0046] The second front wall 722 extends vertically in front of the seat of the second rear wall 721. The second front wall 722 faces the second rear wall 721. The lower part of the second front wall 722 is fixed to the movable rail 61 by bolts and nuts. Also, the second front wall 722 is fixed to the third connecting bracket 73 by welding.

[0047] The second side wall 723 connects the second rear wall 721 and the second front wall 722 in the front - rear direction of the seat. The thickness direction of the second side wall 723 intersects the vertical direction. The upper part of the second side wall 723 is fixed to the second connecting rod 45 by welding.

[0048] The second rear flange 724 is a plate - shaped part extending rearward from the left end of the second rear wall 721. The second rear flange 724 is fixed to the third connecting bracket 73 by welding.

[0049] <The third connecting bracket> The third connecting bracket 73 connects the first connecting bracket 71 and the second connecting bracket 72 in the front - rear direction of the seat. The third connecting bracket 73 has a reinforcing plate part 731, a first flange 732, a second flange 733, a third flange 734, and a slit 735.

[0050] The reinforcing plate part 731 is a plate - shaped part that is overlapped with the first connecting bracket 71 and the second connecting bracket 72 in the seat width direction. Specifically, the reinforcing plate part 731 is arranged so as to face the first side wall 713 of the first connecting bracket 71 and the second side wall 723 of the second connecting bracket 72 in the seat width direction.

[0051] The reinforcing plate part 731 contacts the first rear flange 714 and the first front flange 715 of the first connecting bracket 71, and the second rear flange 724 of the second connecting bracket 72 from the outside (i.e., the left side) in the seat width direction.

[0052] The reinforcing plate portion 731 is welded to the first rear flange 714 from the outside in the sheet width direction via a slit 735. Further, the reinforcing plate portion 731 is welded to the first front flange 715 and the second rear flange 724 from the outside in the sheet width direction via openings, respectively.

[0053] The upper end portions of the reinforcing plate portion 731 are fixed to the first connecting rod 44 and the second connecting rod 45 by welding, respectively.

[0054] The rear end portion of the reinforcing plate portion 731 in the sheet rear direction is located behind the sheet with respect to the first rear flange 714 of the first connecting bracket 71. The front end portion of the reinforcing plate portion 731 in the sheet front direction is located in front of the sheet with respect to the second front wall 722 of the second connecting bracket 72.

[0055] The first flange 732 is a plate-like portion extending to the right from the rear end portion of the reinforcing plate portion 731 in the sheet rear direction. The first flange 732 overlaps the first rear wall 711 of the first connecting bracket 71 from behind the sheet.

[0056] The second flange 733 is a plate-like portion extending to the right from the front end portion of the reinforcing plate portion 731 in the sheet front direction. The second flange 733 overlaps the second front wall 722 of the second connecting bracket 72 from in front of the sheet. The second flange 733 is fixed to the second connecting rod 44 and the second front wall 722 by welding. Further, the second flange 733 is fixed to the movable rail 61 together with the second front wall 722 by bolts and nuts (see Fig. 3A).

[0057] The third flange 734 is a plate-like portion extending to the right from the portion between the first connecting rod 44 and the second connecting rod 45 among the upper end portions of the reinforcing plate portion 731. The front end portion of the third flange 734 in the sheet front direction is fixed to the second connecting rod 45 by welding.

[0058] As shown in FIG. 5, the slit 735 is a strip-shaped opening extending upward from the lower end of the reinforcing plate portion 731. The slit 735 is provided at a position overlapping the first connecting rod 44 in the vertical direction. Further, at least a part of the slit 735 overlaps with the first rear flange 714 of the first connecting bracket 71 in the sheet width direction.

[0059] The reinforcing plate portion 731 is formed with a first end portion 731A that constitutes the rear edge of the slit 735 in the sheet and a second end portion 731B that constitutes the front edge of the slit 735 in the sheet. The first end portion 731A and the second end portion 731B face each other in the sheet front-rear direction with the slit 735 interposed therebetween.

[0060] The first end portion 731A is joined to the first rear flange 714 of the first connecting bracket 71 exposed in the slit 735 by the first welding bead W1. The first welding bead W1 extends in the vertical direction along the rear edge of the slit 735 in the sheet. The first welding bead W1 is formed straddling the first rear flange 714 and the first end portion 731A.

[0061] The second end portion 731B is not fixed to the first connecting bracket 71 by welding or other means. Therefore, even if the first connecting bracket 71 is displaced to the right, the second end portion 731B does not displace to the right together with the first connecting bracket 71.

[0062] In this embodiment, the second end portion 731B overlaps with the first rear flange 714 in the sheet width direction, but does not contact the first rear flange 714. However, the second end portion 731B may contact the first rear flange 714.

[0063] The second end portion 731B is located behind the second welding bead W2 in the sheet. The second welding bead W2 joins the reinforcing plate portion 731 and the first front flange 715 of the first connecting bracket 71. The second end portion 731B is located closer to the first end portion 731A than the second welding bead W2 in the sheet front-rear direction.

[0064] The slit 735 has an extension part 735A and a tip part 735B. The extension part 735A is a part continuous from the lower end part of the reinforcing plate part 731. The width of the extension part 735A is constant along the vertical direction. Also, the extension part 735A has an edge parallel to the vertical direction. The first welding bead W1 is provided on the edge behind the sheet of the extension part 735A.

[0065] The tip part 735B is a part provided above the extension part 735A and constitutes the tip of the slit 735. The tip part 735B has a larger width (that is, the length in the sheet front-rear direction) than the extension part 735A and has an arcuate edge. Therefore, the radius of the edge of the tip part 735B (that is, the radius of curvature of the tip part 735B) is larger than 1 / 2 of the width of the extension part 735A.

[0066] Also, the amount of protrusion of the tip part 735B in the front direction of the sheet with respect to the extension part 735A is larger than the amount of protrusion of the tip part 735B in the rear direction of the sheet with respect to the extension part 735A. That is, the center of the edge of the tip part 735B is located in front of the center line in the width direction of the extension part 735A in the sheet.

[0067] In the present embodiment, the rear end of the tip part 735B is located in front of the rear end of the first welding bead W1 in the sheet. That is, the tip part 735B does not bulge rearward of the sheet more than the first welding bead W1.

[0068] As a result, since stress is dispersed at the arc part of the tip part 735B, the stress applied to the first welding bead W1 straddling the rear edge of the extension part 735A at a position deviated from the arc part and the first connection bracket 71 becomes smaller, and the occurrence of cracks in the first welding bead W1 is suppressed.

[0069] <Reinforcing patch> The reinforcing patch 74 shown in FIG. 4 is a plate-like member overlapped with the reinforcing plate part 731 from the outside in the sheet width direction. The reinforcing patch 74 is fixed to the reinforcing plate part 731 by welding. The reinforcing patch 74 partially overlaps with the tip part 735B of the slit 735.

[0070] <Function of the Legs> When an upward pulling load is input to the buckle 12 via the seat belt 10, in the first leg 7A, the first connecting bracket 71 is pulled to the right and the third connecting bracket 73 is pulled to the left.

[0071] At this time, in the third connecting bracket 73, the first end portion 731A is pulled to the right and the second end portion 731B is pulled to the left, causing the third connecting bracket 73 to bend. As a result, the stress is dispersed before and after the slit 735, and the occurrence of cracks in the welded portion is suppressed.

[0072] [1-2. Effects] According to the embodiment described in detail above, the following effects can be obtained. (1a) The stress generated by the input that lifts the buckle 12 is absorbed by the first end portion 731A and the second end portion 731B that are divided in the front-rear direction of the seat via the slit 735.

[0073] That is, the stress is absorbed by the first end portion 731A welded to the first connecting bracket 71 deforming toward the retractor 11 side and the second end portion 731B separated from the first connecting bracket 71 deforming toward the buckle 12 side. As a result, while avoiding the reinforcement of the first leg 7A due to an increase in the welding length or the number of welding points, damage to the welded portion of the first leg 7A can be suppressed.

[0074] (1b) The stress is dispersed by the tip portion 735B having a width larger than that of the extension portion 735A and having an arcuate edge. Therefore, the occurrence of cracks in the third connecting bracket 73 can be suppressed.

[0075] (1c) Since the tip portion 735B protrudes forward of the seat with respect to the extension portion 735A, the welding length between the first end portion 731A and the first connecting bracket 71 at the rear edge of the seat of the slit 735 can be increased.

[0076] [2. Other Embodiments] Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure can take various forms without being limited to the above embodiments.

[0077] (2a) In the vehicle seat of the above embodiment, the shape of the slit is an example. Therefore, the slit does not necessarily have a width larger than that of the extension portion and a tip portion having an arcuate edge.

[0078] (2b) The vehicle seat of the above embodiment can also be applied to seats used in automobiles other than passenger cars, and seats used in vehicles such as railway vehicles, ships, and airplanes other than automobiles.

[0079] (2c) The function of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Also, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added to, replaced with, etc., the configuration of other above embodiments. Note that all aspects included in the technical idea specified from the language described in the claims are embodiments of the present disclosure.

Description of Reference Numerals

[0080] 1... Vehicle seat, 2... Seat cushion, 3... Seat back, 4... Cushion frame, 5... Back frame, 6A, 6B... Slide device, 7A, 7B... Legs, 10... Seat belt, 11... Retractor, 12... Buckle, 41, 42, 43... Side frames, 44, 45... Connecting rods, 46... Movable part, 47... Fixed bracket, 61... Movable rail, 62... Fixed rail, 71... First connecting bracket, 72... Second connecting bracket, 73... Third connecting bracket, 74... Reinforcing patch, 711... First rear wall, 714... First rear flange, 731... Reinforcing plate portion, 731A... First end portion, 731B... Second end portion, 732... First flange, 733... Second flange, 734... Third flange, 735... Slit, 735A... Extension part, 735B... Tip part.

Claims

1. A seat cushion and a seat back, a cushion frame that supports the seat cushion, a back frame that supports the seat back, a slide device that slidably supports the cushion frame, a leg that connects the cushion frame and the slide device, a seat belt, a retractor that is fixed to the back frame and winds up the seat belt, a buckle that is fixed to the cushion frame and to which the fitting of the seat belt can be detachably attached, comprising: The leg is disposed between the retractor and the buckle in the seat width direction, and has an upper portion fixed to the cushion frame and a lower portion fixed to the slide device, a first connecting bracket; a second connecting bracket that is disposed in front of the seat of the first connecting bracket and has an upper portion fixed to the cushion frame and a lower portion fixed to the slide device; a third connecting bracket that connects the first connecting bracket and the second connecting bracket in the seat front-rear direction; having The third connecting bracket has a plate-shaped reinforcing plate portion that is overlapped with the first connecting bracket and the second connecting bracket in the seat width direction, a slit that extends upward from the lower end portion of the reinforcing plate portion; having A first end portion that constitutes the rear edge of the seat of the slit in the reinforcing plate portion is welded to the first connecting bracket, A second end portion that constitutes the front edge of the seat of the slit in the reinforcing plate portion is not fixed to the first connecting bracket, a vehicle seat.

2. The vehicle seat according to claim 1, wherein the slit has an extending portion that is continuous from the lower end portion of the reinforcing plate portion, and a tip portion that is wider than the extending portion and has an arcuate edge; a vehicle seat.

3. The vehicle seat according to claim 2, wherein the amount of protrusion of the tip portion forward of the seat with respect to the extending portion is larger than the amount of protrusion of the tip portion rearward of the seat with respect to the extending portion, a vehicle seat.

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