Frame structure of vehicle seat and vehicle seat

Abstract

To inhibit an occupant, etc., of a vehicle from touching with an end of a joint part between one skeleton member and another skeleton member.SOLUTION: A frame structure of a vehicle seat 10 includes an upper frame part 26 forming a skeleton of a seat body 16 having a seat cushion 12 for supporting a hip of a seated occupant from the seat lower side and a seat back 14 for supporting a back of the seated occupant from the seat rear side. Further, the frame structure of the vehicle seat 10 includes a side frame part 28 forming the skeleton of the seat body 16. The side frame part 28 has a joint end part 38 which is joined to the upper frame part 26 in an overlapping state. Further, a protruding bead 44 protruding to the opposite side of the upper frame part 26 is formed along an end (an upper end 50) of the joint end part 38.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a frame structure for a vehicle seat and a vehicle seat. [Background technology]

[0002] Patent Document 1 below discloses a seat back for a vehicle seat. The seat back described in this document includes a seat back frame main body that forms the framework of the seat back, a pair of brackets to which both ends of an assist grip are attached, and a wire for hanging a backboard that forms the back of the seat back. The pair of brackets also include a top surface portion to which the assist grip is attached, at least two side surfaces connected to the top surface portion, and a base portion connected to the at least two side surfaces. The pair of brackets are attached to the back of the seat back frame main body at their base portions, and both ends of the wire are fixed to either one of the at least two side surfaces, thereby bridging the pair of brackets. Positioning both ends of the wire in recessed positions in the side surfaces satisfies the requirements for internal vehicle protrusions. In other words, vehicle occupants are prevented from touching both ends of the wire. The requirements for internal vehicle protrusions are those in ECE (ECONOMIC COMMISSION FOR EUROPE REGULATIONS) No. 21. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-111342 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, at a joint where one skeletal member and another skeletal member that constitute the skeleton of a vehicle seat are overlapped and joined, it is desirable to be able to prevent vehicle occupants and the like from touching the edge of the joint, but the configuration described in Patent Document 1 above does not take this into consideration.

[0005] Taking the above facts into consideration, the present invention aims to provide a frame structure for a vehicle seat and a vehicle seat that can prevent vehicle occupants from touching the edge of the joint between one skeletal member and another skeletal member. [Means for solving the problem]

[0006] The frame structure of a first embodiment of a vehicle seat comprises one skeletal member that forms the skeleton of a seat body having a seat cushion that supports the buttocks of a seated occupant from the underside of the seat and a seat back that supports the back of the seated occupant from the rear side of the seat, and another skeletal member that forms the skeleton of the seat body, has a joint end that is joined in a state where it is overlapped on the one skeletal member, and has a convex bead formed along the edge of the joint end that is convex toward the opposite side to the one skeletal member.

[0007] According to the frame structure for a vehicle seat of the first aspect, the joint end of the other skeletal member is joined to the first skeletal member while overlapping the first skeletal member. Here, a convex bead that is convex toward the opposite side from the first skeletal member is formed on the other skeletal member along the edge of the joint end. This prevents a vehicle occupant or the like from touching the edge of the joint end. In this way, the frame structure for a vehicle seat of the first aspect can prevent a vehicle occupant or the like from touching the edge of the joint between the first skeletal member and the other skeletal member.

[0008] The vehicle seat frame structure of the second aspect is the vehicle seat frame structure of the first aspect, in which a part of the convex bead forms an end of the joint end portion.

[0009] According to the vehicle seat frame structure of the second aspect, a part of the convex bead forms the end of the joint edge, which further prevents a vehicle occupant or the like from touching the end of the joint edge.

[0010] The frame structure of a vehicle seat of the third aspect is the frame structure of a vehicle seat of the first aspect, in which the one skeletal member is an upper frame portion that constitutes the upper portion of the seat of the skeleton of the seat back, and the other skeletal member is a pair of left and right side frame portions that constitute both left and right sides of the skeleton of the seat back, and the upper end portions of the pair of left and right side frame portions on the upper side of the seat are the joint end portions.

[0011] According to the frame structure for a vehicle seat of the third aspect, the joint end of the side frame portion is joined to the upper frame portion while overlapping the upper frame portion. Here, a convex bead that is convex toward the opposite side from the upper frame portion is formed on the side frame portion along the edge of the joint end. This prevents a vehicle occupant or the like from touching the edge of the joint end. In this way, the frame structure for a vehicle seat of the third aspect can prevent a vehicle occupant or the like from touching the edge of the joint between the upper frame portion and the side frame portion.

[0012] The frame structure of a vehicle seat of the fourth aspect is the frame structure of a vehicle seat of the third aspect, in which the front end of the joint end and the rear end of the seat are joined to the upper frame portion by welding, and the convex bead is formed along the upper end of the joint end on the seat upper side.

[0013] According to the fourth aspect of the vehicle seat frame structure, the front and rear ends of the joint end are welded to the upper frame portion. This allows the front and rear ends of the joint end to be covered by the welded portion. In addition, the convex bead is formed along the upper end of the joint end. This prevents a vehicle occupant from touching the upper end of the joint end.

[0014] A fifth aspect of the vehicle seat comprises a seat body having a seat cushion that supports the buttocks of a seated occupant from below the seat and a seat back that supports the back of the seated occupant from the rear side of the seat, one skeletal member that forms the skeleton of the seat body, and another skeletal member that forms the skeleton of the seat body, has a joint end that is joined in a state where it is overlapped on the one skeletal member, and has a convex bead that is convex toward the opposite side from the one skeletal member formed along the edge of the joint end.

[0015] According to the vehicle seat of the fifth aspect, the joint end of the other skeletal member is joined to the first skeletal member while overlapping the first skeletal member. Here, a convex bead that is convex toward the opposite side from the first skeletal member is formed on the other skeletal member along the edge of the joint end. This prevents a vehicle occupant or the like from touching the edge of the joint end. In this way, the vehicle seat of the fifth aspect can prevent a vehicle occupant or the like from touching the edge of the joint between the first skeletal member and the other skeletal member. [Effects of the Invention]

[0016] The frame structure of a vehicle seat and the vehicle seat according to the present invention have the excellent effect of preventing vehicle occupants and the like from touching the edge of the joint between one skeletal member and another skeletal member. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a side view schematically showing a vehicle seat according to an embodiment of the present invention; [Figure 2] FIG. 2 is a front view of the seat back frame as viewed from the front side. [Figure 3] 4 is an enlarged front view showing a joint between an upper frame portion and a side frame portion of a seat back frame. FIG. [Figure 4] 4 is a cross-sectional view showing a joint between an upper frame portion and a side frame portion of a seat back frame, taken along the vertical and horizontal directions. FIG. [Figure 5] 10 is a cross-sectional view showing a joint between an upper frame portion and a side frame portion of a seat back frame of a vehicle seat according to a second embodiment, taken along the vertical and horizontal directions. FIG. [Figure 6] 10 is a perspective view showing a joint between an upper frame portion and a side frame portion in a seat back frame of a vehicle seat according to a third embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] A vehicle seat 10 according to an embodiment of the present invention will be described with reference to Figures 1 to 4. Note that the arrows FR, UP, RH, and LH shown in the figures indicate the front side, upper side, right side, and left side of the seat as seen by an occupant seated in the vehicle seat 10, respectively. Hereinafter, when the directions of front-rear, up-down, and left-right are simply used in the description, they will refer to front-rear in the seat front-rear direction, up-down in the seat up-down direction, and left-right in the seat left-right direction, unless otherwise specified. Furthermore, the seat left-right direction coincides with the seat width direction.

[0019] 1, a vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks of a seated occupant from below, and a seat back 14 that supports the back of the seated occupant from the rear. The seat cushion 12 and the seat back 14 form a seat body 16.

[0020] The seat cushion 12 is configured such that a cushion pad 18 covered with a skin material is attached to a cushion frame 20 that forms the framework of the seat cushion 12. The seat cushion 12 is fixed to, for example, the floor of the vehicle body.

[0021] The seat back 14 is configured such that a back pad 22 covered with a skin material is attached to a back frame 24 that forms the framework of the seat back 14. The seat back 14 is supported by the rear end of the seat cushion 12 (the rear end of the cushion frame 20). A reclining mechanism (not shown) is provided between the seat back 14 and the seat cushion 12. This allows the seat back 14 to be tilted relative to the seat cushion 12.

[0022] 2, the back frame 24 that forms the framework of the seat back 14 includes an upper frame portion 26 as a framework member that forms the upper portion of the back frame 24. The back frame 24 also includes a pair of left and right side frame portions 28 that form both sides of the back frame 24 in the left-right direction.

[0023] The upper frame portion 26 is formed by bending a round steel pipe material. The upper frame portion 26 includes a first pipe portion 30 extending in the left-right direction. The upper frame portion 26 also includes a pair of left and right second pipe portions 32 that extend downward from both left and right ends of the first pipe portion 30 and slope outward in the seat width direction as they extend downward. The upper frame portion 26 also includes a pair of left and right third pipe portions 34 that extend downward from the lower ends of the pair of left and right second pipe portions 32. In this embodiment, the vertical dimension of the right third pipe portion 34 is greater than the vertical dimension of the left third pipe portion 34.

[0024] The pair of left and right side frame portions 28 are formed by pressing steel sheet material cut to a predetermined shape. The right and left side frame portions 28 have the same configuration except for their different vertical dimensions. In this embodiment, the vertical dimension of the right side frame portion 28 is smaller than the vertical dimension of the left side frame portion 28. Hereinafter, the configuration of the left side frame portion 28 will be described, and a description of the configuration of the right side frame portion 28 will be omitted. In addition, portions of the right side frame portion 28 corresponding to those of the left side frame portion 28 will be designated by the same reference numerals as those of the left side frame portion 28.

[0025] The side frame portion 28 includes a base portion 36 that extends vertically and whose front-to-rear dimension gradually decreases upward. The side frame portion 28 also includes a tongue-shaped joint end portion 38 that extends upward from the outer portion of the upper end of the base portion 36 in the seat width direction.

[0026] 3, the joint end portion 38 is disposed along the outer surface in the seat width direction of the third pipe portion 34 of the upper frame portion 26. A large portion of the joint end portion 38 has a curved shape that follows the outer surface in the seat width direction of the third pipe portion 34 of the upper frame portion 26. The joint end portion 38 is joined by welding to the outer surface in the seat width direction of the third pipe portion 34 in a state where it is overlapped on the outer surface in the seat width direction of the third pipe portion 34 of the upper frame portion 26.

[0027] In Figure 3, welded portions 40 for joining the third pipe portion 34 and the joint end portion 38 are shown by two-dot chain lines. The welded portions 40 are portions called weld beads. In this embodiment, the welded portions 40 are formed along the boundary between the front end 42 of the joint end portion 38 and the third pipe portion 34. Although not shown, the welded portions 40 are also formed along the boundary between the rear end of the joint end portion 38 and the third pipe portion 34. The upper portions of these welded portions 40 are located at the same vertical position as a convex bead 44, which will be described later.

[0028] Here, a convex bead 44 that is convex toward the opposite side from the third pipe section 34 is formed on the upper part 46 of the joint end 38. The surface of the convex bead 44 opposite the third pipe section 34 is convexly curved, and the surface of the convex bead 44 facing the third pipe section 34 is concavely curved. As shown in Figures 3 and 4, in this embodiment, the convex bead 44 is formed in a middle part 46B in the front-rear direction of the upper part 46 of the joint end 38, excluding both end parts 46A in the front-rear direction. In other words, the convex bead 44 is formed only in the middle part 46B in the front-rear direction of the upper part 46 of the joint end 38, and the convex bead 44 is not formed on both end parts 46A in the front-rear direction of the upper part 46 of the joint end 38.

[0029] Here, the portion of the joint end 38 that is arranged to contact the outer surface of the third pipe section 34 of the upper frame section 26 in the seat width direction is referred to as the joint end main body 48. In this case, the convex bead 44 can be said to be configured to protrude from the joint end main body 48 toward the opposite side of the third pipe section 34.

[0030] In this embodiment, a part of the convex bead 44 forms the upper end 50 of the joining end portion 38. In addition, a portion 50A of the convex bead 44 that forms the upper end 50 of the joining end portion 38 is separated from the third pipe portion 34.

[0031] In Figure 4, a headform 52, which is intended to fit the head of an occupant, is shown by a two-dot chain line. The diameter D1 of the headform 52 is 165 mm. The maximum protruding height H1 of the convex bead 44 from the joint end body 48 is set so that the headform 52 does not hit the upper end 50 of the joint end 38 when pressed against the vicinity of the joint end 38. The upper frame portion 26, shown by a two-dot chain line in Figure 4, is shown in a state in which it is deformed by the load input from the headform 52.

[0032] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0033] 3 and 4 , in this embodiment, the joint end 38 of the side frame portion 28 is welded to the upper frame portion 26 while overlapping the third pipe portion 34 of the upper frame portion 26. Here, a convex bead 44 that is convex toward the opposite side from the upper frame portion 26 is formed on the side frame portion 28 along the upper end 50 of the joint end 38. As a result, the convex bead 44 prevents vehicle occupants and the like from touching the upper end 50 of the joint end 38. In this way, in this embodiment, it is possible to prevent vehicle occupants and the like from touching the upper end 50 of the joint end 38.

[0034] Furthermore, in this embodiment, the convex bead 44 is formed only in the middle portion 46B in the front-to-rear direction of the upper portion 46 of the joint end portion 38, and the convex bead 44 is not formed in both end portions 46A in the front-to-rear direction of the upper portion 46 of the joint end portion 38. This allows the convex bead 44 to be located at the same position in the up-down direction as the part of the welded portion 40 joining the front end 42 of the joint end portion 38 and the third pipe portion 34 and the part of the welded portion 40 joining the rear end of the joint end portion 38 and the third pipe portion 34.

[0035] Moreover, in this embodiment, a part of the convex bead 44 forms the upper end 50 of the joint end 38. This further prevents vehicle occupants and the like from coming into contact with the upper end 50 of the joint end 38. Moreover, in this embodiment, a portion 50A of the convex bead 44 that forms the upper end 50 of the joint end 38 is separated from the third pipe section 34. This configuration eliminates the need to form the portion 50A into a shape that contacts the third pipe section 34. As a result, the joint end 38 having the convex bead 44 can be easily formed.

[0036] In this embodiment, the front end 42 and rear end of the joint end portion 38 are joined by welding to the third pipe portion 34 of the upper frame portion 26. This allows the front end 42 and rear end of the joint end portion 38 to be covered by the welded portion 40.

[0037] In the present embodiment, an example has been described in which a part of the convex bead 44 forms the upper end 50 of the joint end 38, and the portion 50A of the convex bead 44 that forms the upper end 50 of the joint end 38 is separated from the third pipe section 34, but the present invention is not limited to this. For example, as in a second embodiment shown in Fig. 5, a configuration may be adopted in which the convex bead 44 is formed below the upper end 50 of the joint end 38, and the entire vicinity of the upper end 50 of the joint end 38 is in contact with the third pipe section 34. In the second embodiment, members and portions corresponding to those in the first embodiment are denoted by the same reference numerals as in the first embodiment.

[0038] In addition, in this embodiment, an example has been described in which the convex bead 44 is formed only in the middle portion 46B in the front-rear direction of the upper portion 46 of the joint end portion 38, and the convex bead 44 is not formed in both end portions 46A in the front-rear direction of the upper portion 46 of the joint end portion 38, but the present invention is not limited to this. For example, as in the third embodiment shown in Fig. 6, a configuration in which the convex bead 44 is formed over the entire range in the front-rear direction of the upper portion 46 of the joint end portion 38 may be used. Note that in the third embodiment, members and parts corresponding to those in the first embodiment described above are denoted by the same reference numerals as in the first embodiment.

[0039] In addition, in each of the above-described embodiments, the above-described configuration is applied to the joint between the upper frame portion 26 and the side frame portion 28 of the back frame 24, but the present invention is not limited to this. The configuration of the present invention can be applied to the joint between one frame member and another frame member in each part of the seat main body 16.

[0040] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0041] 10 Vehicle seats 12 seat cushions 14 Seat back 16 Seat body 26 Upper frame part (first frame member) 28 Side frame part (other frame parts) 38 Joint end 44 Convex bead 50 Upper end of joint end (end of joint end)

Claims

1. a frame member constituting a frame of a seat body having a seat cushion that supports the buttocks of a seated occupant from below the seat and a seat back that supports the back of the seated occupant from behind the seat; another skeletal member that constitutes the skeleton of the seat body, has a joint end that is joined to the first skeletal member in a state where the other skeletal member is overlapped, and has a convex bead that is convex toward the opposite side from the first skeletal member and is formed along the end of the joint end; Equipped with the one framework member is an upper frame portion that constitutes a portion of the framework of the seat back on the seat upper side, the other framework members are a pair of left and right side frame portions that constitute both sides of the framework of the seat back in the left-right direction, A frame structure for a vehicle seat, wherein the surface of the convex bead opposite to the surface facing the upper frame portion is convexly curved, and the surface of the convex bead facing the upper frame portion is concavely curved.

2. 2. The frame structure for a vehicle seat according to claim 1, wherein a part of the convex bead forms an end of the joint end portion.

3. A frame structure for a vehicle seat as described in Claim 1, wherein the ends of the pair of left and right side frame portions above the seat are the joint ends.

4. The seat front end and the seat rear end of the joint end are joined to the upper frame portion by welding, 4. The vehicle seat frame structure according to claim 3, wherein the convex bead is formed along an edge of the joint end portion on an upper side of the seat.

5. a seat body having a seat cushion that supports the buttocks of a seated occupant from below the seat and a seat back that supports the back of the seated occupant from behind the seat; a skeleton member that constitutes a skeleton of the seat body; another skeletal member that constitutes the skeleton of the seat body, has a joint end that is joined to the first skeletal member in a state where the other skeletal member is overlapped, and has a convex bead that is convex toward the opposite side from the first skeletal member and is formed along the end of the joint end; Equipped with the one framework member is an upper frame portion that constitutes a portion of the framework of the seat back on the seat upper side, the other framework members are a pair of left and right side frame portions that constitute both sides of the framework of the seat back in the left-right direction, The surface of the convex bead opposite to the surface facing the upper frame portion is convexly curved, and the surface of the convex bead facing the upper frame portion is concavely curved.

6. A frame structure for a vehicle seat as described in Claim 1, wherein the convex bead is formed only in the middle portion in the fore-and-aft direction at the end of the joint end portion, and not at both ends in the fore-and-aft direction.

7. A vehicle seat as described in Claim 5, wherein the convex bead is formed only in the middle portion in the fore-and-aft direction at the end of the joint end portion, and not at both ends in the fore-and-aft direction.

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