Vehicle seat frame structure and vehicle seat

Abstract

To provide a seat frame structure for vehicle and a seat for vehicle which can suppress falling from a slide rail of a bracket that connects a seat cushion fame to the slide rail in the time of collision of a vehicle.SOLUTION: A converging part 46 is provided in a front end part 32A of a stationary part 32 of a riser bracket 28 in the center part in the vehicle width direction of a seat 10 for vehicle and the width dimension is set to be shorter than the width dimension of a general part 32B. The converging part 46 is formed so as not to protrude from an outer wall part 24B of a slide rail 22. Even when a portion of a major load is transmitted to the riser bracket 28 side, the converging part 46 can be grounded on an upper surface 26B of an upper rail 26 over the substantially entire body, and the riser bracket 28 is supported by the slide rail 22. Consequently, the fall from the slide rail 22 of the riser bracket 28 can be effectively suppressed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] The following Patent Document 1 discloses a technology relating to the frame structure of a vehicle seat (rear seat) used in the second or third row of a vehicle such as a minivan. In this prior art, the vehicle seat is configured with a single seat and a double seat arranged side by side along the width direction of the vehicle.

[0003] The seat cushion frame, which forms the skeleton of the seat cushion on which the occupant sits, is connected to the outer side in the seat width direction and the rear end in the seat front-to-rear direction of the seat with a seat back frame that forms the skeleton of the seat back that supports the upper body of the occupant seated on the seat cushion.

[0004] A connecting bracket is connected to the lower end of the seatback frame, and a riser is fixed to the connecting bracket, which is in turn fixed to a slide rail provided on the vehicle floor. The seat cushion frame is attached to the slide rail via the riser and the connecting bracket, and the seat cushion frame is movable along the slide rail in the fore-and-aft direction of the vehicle. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-112996 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned prior art, when a large load (collision load) is input to the seat back in the forward direction of the seat due to, for example, a frontal collision of the vehicle (hereinafter referred to as a "frontal collision"), the large load is transmitted to the riser (riser bracket) via the seat back frame and the connecting bracket.

[0007] In rear seats where one-seater seats and two-seater seats are arranged side by side along the width of the vehicle, when considering the ease of assembling the risers to the slide rails, the connection point with the seat back is not directly above the slide rails, so when a large load is transmitted to the risers, there is a possibility that the risers will fall below the top surface of the slide rails.

[0008] In consideration of the above facts, the present invention aims to provide a vehicle seat frame structure and a vehicle seat that can prevent a bracket connecting a seat cushion frame to a slide rail from falling off the slide rail in the event of a vehicle collision. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, a vehicle seat frame structure according to the invention of claim 1 includes: a slide rail that is provided on a vehicle body floor and enables a vehicle seat on which an occupant sits to slide in a seat front-rear direction; and a bracket that is connected to an outer side in a seat width direction and a rear end in a seat front-rear direction of a seat cushion frame that constitutes a framework of a seat cushion that supports the waist and thighs of the seated occupant, and is fixed to the slide rail, wherein the bracket includes a fixing portion fixed to the slide rail, and the fixing portion a convergent portion formed at a front end portion in the seat front-rear direction, the width dimension in the seat width direction being set shorter than the width dimension in the seat width direction of a general portion other than the front end portion; The bracket is configured to include a first vertical wall portion formed to stand from an outer end of the general portion of the fixing portion in the seat width direction, and a second vertical wall portion formed to stand from an outer end of the convergent portion of the fixing portion in the seat width direction and connected to the first vertical wall portion, and a front wall portion formed to stand at a front end of the fixing portion in the seat front-rear direction and connected to the second vertical wall portion. .

[0010] The vehicle seat frame structure according to the invention of claim 1 includes a slide rail and a bracket. The slide rail is provided on the vehicle body floor and allows the vehicle seat on which an occupant sits to slide in the front-rear direction of the seat. The bracket is connected to the outer side in the seat width direction and the rear end in the front-rear direction of the seat cushion frame that constitutes the framework of the seat cushion that supports the waist and thighs of the seated occupant, and is fixed to the slide rail.

[0011] The bracket includes a fixed portion fixed to the slide rail, and the fixed portion has a convergent portion formed at a front end of the fixed portion (in the seat front-rear direction), and the convergent portion has a width dimension in the seat width direction that is shorter than the width dimension in the seat width direction of a general portion other than the front end.

[0012] When a large load is input to the seat back in the forward direction of the seat due to a frontal collision of the vehicle or the like, the load is transmitted from the seat back frame via the bracket to the slide rail, but at the fixed part of the bracket, a moment acts around the fixed part with the slide rail, causing the front end of the fixed part to move downward toward the seat.

[0013] In this invention, by providing a convergent portion at the front end of the fixed portion fixed to the slide rail, which is set to have a width dimension shorter than that of the general portion, the front end of the fixed portion that is attempting to move downward on the seat can be supported by the slide rail via the convergent portion, thereby making it possible to prevent the bracket from falling off the slide rail.

[0014] In the present invention, the bracket includes a first vertical wall portion and a second vertical wall portion. The first vertical wall portion is formed to stand from the outer end of the general portion of the fixing portion in the seat width direction, and the second vertical wall portion is formed to stand from the outer end of the convergent portion of the fixing portion in the seat width direction and is connected to the first vertical wall portion. In this way, in the present invention, by forming and connecting the first vertical wall portion and the second vertical wall portion from the general portion to the convergent portion of the fixing part, the load transmitted from the seat back frame can be transmitted from the general portion to the convergent portion via the first vertical wall portion and the second vertical wall portion. In other words, the load transmitted to the bracket can be effectively transmitted to the front end side of the fixing part. Furthermore, in the present invention, a front wall portion connected to the second vertical wall portion is formed at the front end of the fixing portion in the seat front-rear direction, thereby reinforcing the second vertical wall portion and enabling the load transmitted to the second vertical wall portion to be transmitted to the front wall portion. In other words, in the present invention, the load transmitted to the bracket can be effectively transmitted to the front end side of the fixing portion. It should be noted that the term "connected" here means that the bracket may be directly connected to the seat cushion frame, or may be indirectly connected via a separate member.

[0015] The vehicle seat frame structure according to the invention recited in claim 2 is the vehicle seat frame structure according to the invention recited in claim 1, The vertical wall portion and the front wall portion are connected to each other in a curved shape in a plan view, and the tip of the vertical wall portion and the tip of the front wall portion are formed to be continuously connected.

[0016] In the vehicle seat frame structure according to the invention of claim 2, The vertical wall portion and the front wall portion are connected in a curved shape in a plan view. Furthermore, the tip of the vertical wall portion and the tip of the front wall portion are continuously connected. This makes it possible to prevent stress concentration in the vertical wall portion and the front wall portion when a load is transmitted between the vertical wall portion and the front wall portion.

[0017] The vehicle seat frame structure according to the invention of claim 3 comprises: The vehicle seat is provided with a slide rail that is provided on a vehicle body floor and enables a vehicle seat on which an occupant sits to slide in the front-rear direction of the seat, and a bracket that is connected to the outside in the seat width direction and the rear end in the front-rear direction of the seat of a seat cushion frame that constitutes the skeleton of a seat cushion that supports the waist and thighs of the seated occupant and is fixed to the slide rail, the bracket including a fixing portion fixed to the slide rail, formed at the front end in the front-rear direction of the seat of the fixing portion, and having a width dimension in the seat width direction that is a general portion other than the front end. The bracket is provided with a converging portion that is set shorter than the width dimension in the seat width direction at the general portion of the fixing portion, and the bracket includes a first vertical wall portion that is formed by standing up from the outer end of the general portion of the fixing portion in the seat width direction, and a second vertical wall portion that is formed by standing up from the outer end of the converging portion of the fixing portion in the seat width direction and connected to the first vertical wall portion, and the bracket has a rib that spans the fixing portion and the second vertical wall portion, and the fixing portion has a fastening portion that fixes the bracket to the slide rail between the rib and a front wall portion that is connected to the second vertical wall portion.

[0018] In the vehicle seat frame structure according to the invention of claim 3, The vehicle seat includes a slide rail and a bracket. The slide rail is provided on the vehicle body floor and allows the vehicle seat on which an occupant sits to slide in the fore-and-aft direction of the seat. The bracket is connected to the outer side in the seat width direction and the rear end in the fore-and-aft direction of a seat cushion frame that constitutes the framework of the seat cushion that supports the waist and thighs of the seated occupant, and is fixed to the slide rail. The bracket includes a fixed portion fixed to the slide rail, and the fixed portion has a convergent portion formed at a front end of the fixed portion (in the seat front-rear direction), and the convergent portion has a width dimension in the seat width direction that is shorter than the width dimension in the seat width direction of a general portion other than the front end. When a large load is input to the seat back in the forward direction of the seat due to a frontal collision of the vehicle or the like, the load is transmitted from the seat back frame via the bracket to the slide rail, but at the fixed part of the bracket, a moment acts around the fixed part with the slide rail, causing the front end of the fixed part to move downward toward the seat. In this invention, by providing a convergent portion at the front end of the fixed portion fixed to the slide rail, which is set to have a width dimension shorter than that of the general portion, the front end of the fixed portion that is attempting to move downward on the seat can be supported by the slide rail via the convergent portion, thereby making it possible to prevent the bracket from falling off the slide rail. In the present invention, the bracket includes a first vertical wall portion and a second vertical wall portion. The first vertical wall portion is formed to stand from the outer end of the general portion of the fixing portion in the seat width direction, and the second vertical wall portion is formed to stand from the outer end of the convergent portion of the fixing portion in the seat width direction and is connected to the first vertical wall portion. In this way, in the present invention, by forming and connecting the first vertical wall portion and the second vertical wall portion from the general portion to the convergent portion of the fixing part, the load transmitted from the seat back frame can be transmitted from the general portion to the convergent portion via the first vertical wall portion and the second vertical wall portion. In other words, the load transmitted to the bracket can be effectively transmitted to the front end side of the fixing part.

[0019] Furthermore, in the present invention, the bracket includes a converging portion and a rib is formed spanning the fixed portion and the second vertical wall portion, thereby reinforcing the second vertical wall portion and enabling the load transmitted to the second vertical wall portion via the rib to be transmitted to the fixed portion fixed to the slide rail. Furthermore, in the present invention, the fixing portion of the bracket is fixed to the slide rail via the fastening portion, so that the load input to the seat cushion frame is transmitted to the slide rail via the fastening portion of the bracket. In addition, in the present invention, a fastening portion is provided between the front wall portion of the fixed portion and the rib, which serves as one of the load transmission paths when a load is transmitted from the seat back frame via the bracket and the slide rail to the vehicle body floor. In this way, in the present invention, by providing a fastening portion that serves as one of the load transmission paths between the front wall portion and the rib, it is possible to reliably transmit the load input to the bracket to the slide rail side.

[0020] The vehicle seat frame structure according to the invention recited in claim 4 is the vehicle seat frame structure recited in any one of claims 1 to 3, The converging portion is formed so as not to protrude from an outer wall portion provided on the outer side of the slide rail in the seat width direction in a plan view.

[0021] In the vehicle seat frame structure according to the invention of claim 4, The converging portion is formed so as not to protrude from the outer wall portion of the slide rail provided on the outer side in the seat width direction in a plan view, so that the converging portion can contact the slide rail over substantially the entirety in the event of a frontal collision of the vehicle, etc. In other words, the bracket is supported by the slide rail via the converging portion, which makes it possible to more effectively prevent the bracket from dropping off the slide rail.

[0023] The vehicle seat frame structure according to the invention of claim 5 comprises: Any one of claims 1 to 3 In the vehicle seat frame structure according to the invention described above, The slide rail is composed of a lower rail fixed to the vehicle body floor side and an upper rail arranged inside the lower rail in the seat width direction and slidable relative to the lower rail, and the converging portion is formed so as not to protrude from the upper surface to which the fixing portion is fixed on the upper rail in a plan view.

[0024] In the vehicle seat frame structure according to the invention of claim 5, The slide rail is configured to include a lower rail and an upper rail, and the lower rail is fixed to the vehicle body floor side. On the other hand, the upper rail is disposed on the inner side of the lower rail in the seat width direction. The convergent portion is formed so as not to protrude from the upper surface of the upper rail to which the fixing portion is fixed in a plan view.

[0025] As a result, in the event of a frontal collision of the vehicle, the convergent portion is brought into contact with the upper surface of the upper rail to which the fixed portion is fixed, over substantially the entirety of the convergent portion. That is, the bracket is supported by the slide rail via the upper rail through the convergent portion. This makes it possible to more reliably prevent the bracket from dropping off the slide rail.

[0026] A vehicle seat frame structure according to the invention of claim 6. In the vehicle seat frame structure according to the invention described in any one of claims 1 to 5, the second vertical wall portion is formed so as to gradually become more inward in the seat width direction than the outer wall portion provided on the outer side of the slide rail in the seat width direction as it moves forward in the seat fore-and-aft direction.

[0027] Claim 6 1. A vehicle seat frame structure according to the invention described in In the seat backrest, the second vertical wall portion is formed so that it gradually becomes more inward in the seat width direction than the outer wall portion of the slide rail as it moves forward in the seat front-rear direction, preventing a step from being formed in the second vertical wall portion. This makes it possible to prevent stress concentration in the second vertical wall portion when a load is transmitted to the second vertical wall portion.

[0034] Claim 7 The vehicle seat according to the invention described in claims 1 to 5 6 The vehicle seat frame structure according to any one of the above items is applied.

[0035] Claim 7 In the vehicle seat according to the invention described above, it is possible to enjoy the effects obtained by the vehicle seat frame structure of the invention. [Effects of the Invention]

[0036] As described above, the vehicle seat frame structure and vehicle seat of the present invention can prevent the bracket connecting the seat cushion frame to the slide rail from falling off the slide rail in the event of a vehicle collision. [Brief explanation of the drawings]

[0037] [Figure 1] 1 is a perspective view showing a vehicle seat according to an embodiment of the present invention; [Figure 2] 1 is an enlarged perspective view of a main portion of a vehicle seat according to an embodiment of the present invention; [Figure 3] 1 is an enlarged plan view of a main portion of a vehicle seat according to an embodiment of the present invention; [Figure 4] 2 is an enlarged cross-sectional view illustrating a main part of the vehicle seat according to the present embodiment. FIG. [Figure 5]3 is an enlarged perspective view of a main part corresponding to FIG. 2 when a large load directed forward in the seat front-rear direction is input to the seat back of the vehicle seat according to the present embodiment. FIG. [Figure 6] 5 is an enlarged cross-sectional view of a main part corresponding to FIG. 4 when a large load directed forward in the seat front-rear direction is input to the seat back of the vehicle seat according to the present embodiment. FIG. [Figure 7] FIG. 4 is an enlarged plan view of a main part corresponding to FIG. 3 as a comparative example. [Figure 8] FIG. 5 is an enlarged cross-sectional view of a main part corresponding to FIG. 4 as a comparative example. [Figure 9] FIG. 6 is an enlarged perspective view of a main part corresponding to FIG. 5 as a comparative example. [Figure 10] FIG. 7 is an enlarged cross-sectional view of a main part corresponding to FIG. 6 as a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0038] A vehicle seat 10 to which a vehicle seat frame structure according to an embodiment of the present invention is applied will be described below with reference to the drawings. Note that the arrows FR, UP, IN, and OUT shown appropriately in each drawing indicate the front (direction of travel), the top, the inside, and the outside of the vehicle width direction, respectively. Hereinafter, when the terms "front-rear," "left-right," and "up-and-down" are used in the description, they will refer to the front-rear direction of the vehicle, the left-right direction of the vehicle (vehicle width direction), and the up-and-down direction of the vehicle, unless otherwise specified.

[0039] (Configuration of vehicle seat frame structure) First, the configuration of a vehicle seat to which the vehicle seat frame structure according to this embodiment is applied will be described.

[0040] The vehicle seat is used, for example, as a second- or third-row seat in a vehicle such as a minivan. In a second- or third-row vehicle seat, a single-seater seat and a double-seater seat are arranged side by side in the vehicle width direction, and the double-seater seat and the single-seater seat may be located on either the left or right side of the vehicle. In the following explanation, a single-seater seat will be used as an example.

[0041] As shown in FIG. 1, a vehicle seat 10 to which the vehicle seat frame structure according to this embodiment is applied includes a cushion frame 14 that forms the framework of a seat cushion 12 that supports the lower back and thighs of a seated occupant, and a seat back frame 18 that forms the framework of a seat back 16 that supports the upper body of the seated occupant.

[0042] A lower end 18A of a seat back frame 18 is connected to a rear end 14A of the cushion frame 14, and a pair of headrest stay holders 18B1 to which a headrest (not shown) is attached is provided at an upper end 18B of the seat back frame 18. The cushion frame 14 and the seat back frame 18 are configured by joining together, for example, sheet metal members or metal pipe members, and each has a rectangular frame shape.

[0043] Meanwhile, a pair of left and right slide rails 22 are fixed to a vehicle floor (body floor) 20 by fastening means such as bolts. A vehicle seat 10 is connected to the slide rails 22, and the vehicle seat 10 is slidable in the fore-and-aft direction of the vehicle along the slide rails 22. The left and right slide rails 22 have substantially the same configuration. Therefore, in the following description, when it is not necessary to distinguish between the left and right, only one of the slide rails 22 will be described.

[0044] The slide rail 22 includes a lower rail 24 provided on the lower side of the slide rail 22 and an upper rail 26 provided on the upper side of the slide rail 22. The lower rail 24 forms the outer shape of the slide rail 22, and as shown in Fig. 4, when cut along the width direction, the lower rail 24 has a generally U-shape that is open on the upper side. When cut along the width direction, the upper rail 26 has a generally inverted U-shape that is open on the lower side, and is disposed inside the lower rail 24 in the width direction.

[0045] More specifically, at both ends of the lower rail 24 in the width direction, there is provided a folded portion 24A which includes a shoulder portion 24A1 which protrudes approximately horizontally toward the inside in the width direction, and a hanging portion 24A2 which hangs downward from the tip of the shoulder portion 24A1.

[0046] Furthermore, folded portions 26A are formed at both widthwise ends of the upper rail 26. The folded portions 26A extend substantially horizontally outward in the widthwise direction, then extend upward, and have their centers bent inward in the widthwise direction. The folded portions 26A of the upper rail 26 are disposed within the folded portions 24A of the lower rails 24, thereby restricting upward movement of the upper rail 26 relative to the lower rails 24.

[0047] 1, riser brackets (brackets) 28, 30 are fixed to upper surfaces 26B of rear end portions 27 of the left and right upper rails 26. The riser brackets 28, 30 are made of, for example, sheet metal.

[0048] 3, the left and right riser brackets 28, 30 are generally rectangular in plan view, and each includes a fixed portion 32 fixed to the upper surface 26B of the upper rail 26, and a vertical wall portion (first vertical wall portion) 34 standing upward from the outer end in the seat width direction of the fixed portion 32. Note that while only the riser bracket 28 is shown in FIG. 3, the riser bracket 30 has generally the same configuration as the riser bracket 28.

[0049] A rectangular connecting plate 36 is installed between the left and right riser brackets 28, 30. The connecting plate 36 is made of, for example, sheet metal and is disposed with its thickness oriented in the vertical direction of the vehicle. Both longitudinal ends of the connecting plate 36 are fixed to the upper surface 26B of the upper rail 26 together with the left and right riser brackets 28, 30 by bolting or the like, thereby reinforcing the left and right slide rails 22.

[0050] 1, the lower end 18A of the seatback frame 18 is rotatably connected to the vertical wall portion 34 of the riser bracket 30 around an axis along the vehicle width direction. Meanwhile, a connecting bracket 38 is fixed to the vertical wall portion 34 of the riser bracket 28 on the outer side in the seat width direction. The connecting bracket 38 is made of, for example, sheet metal and is disposed with its thickness direction aligned with the vehicle width direction.

[0051] 1 and 3, the lower end 38A of the connecting bracket 38 is fixed to the vertical wall portion 34 of the riser bracket 28 by fastening with bolts 40 and nuts 42, and the lower end 18A of the seat back frame 18 is connected to the upper part of the connecting bracket 38 via a well-known reclining mechanism 44. This makes it possible to adjust the tilt angle of the seat back 16 relative to the connecting bracket 38.

[0052] As described above, the vehicle seat 10 is fixed to the left and right slide rails 22 via the riser bracket 28, the connecting bracket 38, and the riser bracket 30, respectively, and is slidable along the slide rails 22. For this reason, as shown in Fig. 4, the top surface 26B of the upper rail 26 protrudes upward beyond the shoulder portion 24A1 of the lower rail 24. This prevents the riser brackets 28, 30 from interfering with the lower rail 24 when the vehicle seat 10 slides along the slide rail 22.

[0053] In this embodiment, a connecting bracket 38 is provided on the riser bracket 28 side separately from the riser bracket 28, and the connecting bracket 38 is connected to the lower end portion 18A of the seat back frame 18, but the connecting bracket 38 does not necessarily have to be separate from the riser bracket 28. In other words, although not shown, the connecting bracket 38 may be formed integrally with the riser bracket 28.

[0054] 3, the riser bracket 28 is provided with a converging portion 46 at the front end 32A of the fixed portion 32 in the seat front-rear direction. The converging portion 46 is set so that its width dimension W2 along the seat width direction is shorter than the width dimension W1 of the general portion 32B, which is the portion of the fixed portion 32 other than the converging portion 46.

[0055] The converging portion 46 is formed so as not to protrude substantially from the outer wall portion 24B of the lower rail 24 that constitutes the outer shape of the slide rail 22 and is provided on the outside in the seat width direction in a plan view. The converging portion 46 includes a front wall portion 48, which will be described later, and the front wall portion 48 is formed so as not to protrude substantially from the top surface 26B of the upper rail 26 in a plan view.

[0056] Here, it is preferable that the front wall portion 48 is formed so as not to completely protrude from the top surface 26B of the upper rail 26 in a plan view, but this is not limited to this in consideration of variations in the external dimensions of the lower rail 24, etc. Therefore, it is sufficient that at least the convergent wall 47 side of the front wall portion 48, which will be described later, is positioned higher than the top surface 26B of the upper rail 26.

[0057] 2 and 3, a converging wall (second vertical wall portion) 47 is formed in the converging portion 46, rising upward from the outer end in the seat width direction. This converging wall 47 is connected to the vertical wall portion 34 formed in the general portion 32B of the fixing portion 32, and as shown in FIG. 3, is formed so as to incline inward in the seat width direction as it extends forward in the seat front-rear direction.

[0058] The converging wall 47 may be formed in a curved shape that bulges outward in the seat width direction, although this is not shown, as long as it is formed so that it gradually becomes more inward in the seat width direction as it moves forward in the seat front-rear direction. Depending on the configuration of the riser bracket 28, the converging wall 47 may be formed with a step in the seat up-down direction or the seat front-rear direction.

[0059] 2, a front wall portion (converging portion) 48 stands upright at the front end of the fixing portion 32 in the seat front-rear direction. This front wall portion 48 is formed to be connected to a converging wall 47. Note that, as shown in FIG. 3, the converging wall 47 and the front wall portion 48 are connected to each other in a curved shape in a plan view, and the tip of the converging wall 47 and the tip of the front wall portion 48 are formed to be continuously connected.

[0060] 2 and 4, in this embodiment, flange portions 47A and 48A that bend inward in the seat width direction are formed at the leading ends of the convergent wall 47 and the front wall portion 48, respectively, and the flange portion 47A of the convergent wall 47 and the flange portion 48A of the front wall portion 48 are continuously connected. Note that a flange portion 34A is also formed at the leading end of the vertical wall portion 34, and the flange portion 34A of the vertical wall portion 34 and the flange portion 47A of the convergent wall 47 are also continuously connected.

[0061] 3 and 5, the riser bracket 28 is formed with a rib 50 that protrudes upward from the seat and spans the fixing portion 32 and the converging wall 47. As described above, the riser bracket 28 is made of sheet metal, and the shape of the riser bracket 28 is formed by press working.

[0062] Therefore, in this embodiment, in order to form the rib 50, a recess 51 is formed on the back surface 32D of the riser bracket 28 by the amount of protrusion caused by the formation of the rib 50 on the front surface 32C of the riser bracket 28. Note that the rib 50 does not necessarily have to be formed by press working. For example, the rib 50 may be formed by a convex bead or the like by welding or the like. In this case, the recess 51 is not formed.

[0063] As described above, the fixing portion 32 of the riser bracket 28 is fixed to the upper surface 26B of the rear end portion 27 of the upper rail 26, as shown in Fig. 4. In this embodiment, as shown in Fig. 3, a fastening portion 52 for fixing the riser bracket 28 to the slide rail 22 is provided between at least the front wall portion 48 and the rib 50 of the riser bracket 28. The fastening portion 52 is fastened with a bolt 54 and a nut 56.

[0064] (Action and effect of vehicle seat frame structure) Next, the operation and effects of the vehicle seat to which the vehicle seat frame structure according to this embodiment is applied will be described.

[0065] 1 to 3, in the present embodiment, a convergent portion 46 is provided at the front end 32A of the fixing portion 32 of the riser bracket 28 in the vehicle width direction center portion of the vehicle seat 10. A width dimension W2 of the convergent portion 46 along the seat width direction is set to be shorter than a width dimension W1 of the general portion 32B. In addition, the convergent portion 46 is formed so as not to protrude from the outer wall portion 24B of the lower rail 24 in a plan view.

[0066] As a comparative example, a case will be considered in which the fixing portion 102 of the riser bracket 100 has a generally rectangular shape in a plan view and has a generally constant width W3 from the front end 102A to the rear end 102B, as shown in Fig. 7. Here, as shown in Fig. 8, the vertical wall portion 103 formed on the outer side of the riser bracket 100 in the seat width direction protrudes from the outer wall portion 106A of the lower rail 106 that constitutes the lower part of the slide rail 104.

[0067] Generally, although not shown in the figure, when a large load is input to the seat back in the forward direction of the seat due to a frontal collision of the vehicle or the like, the load is transmitted from the seat back frame via the riser bracket to the slide rail, but at the fixed portion of the riser bracket, a moment acts around the fixed portion with the slide rail, and the load is concentrated on the front end side of the fixed portion of the riser bracket.

[0068] In the comparative example, when a load is concentrated on the front end 102A side of the riser bracket 100 shown in FIG. 7, the front end 102A of the riser bracket 100 moves toward the lower side of the seat, and the riser bracket 100 tends to fall diagonally forward.

[0069] In this case, as shown in FIG. 10, the vertical wall portion 103 of the riser bracket 100 is formed to protrude from the outer wall portion 106A of the slide rail 104, so as shown in FIG. 9, the riser bracket 100 may fall below the upper surface 106B of the slide rail 104.

[0070] 3 and 4, in the vehicle seat 10 of the present embodiment, a convergent portion 46 having a width dimension W2 set shorter than the width dimension W1 of the general portion 32B is provided at the front end 32A of the fixing portion 32 of the riser bracket 28 in the center in the vehicle width direction. A convergent wall 47 provided at the convergent portion 46 is formed so as not to protrude from the outer wall portion 24B of the lower rail 24 of the slide rail 22, and a front wall portion 48 of the convergent portion 46 is formed so as not to protrude from the upper surface 26B of the upper rail 26.

[0071] With the above-described configuration, in this embodiment, even if a large load is input to the seat back 16 in the forward direction of the seat due to a frontal collision of the vehicle or the like and a portion of the large load is transmitted to the riser bracket 28 located on the central side of the vehicle width direction of the vehicle seat 10, the convergence portion 46 of the riser bracket 28 can be in contact with the slide rail 22 over almost the entirety.

[0072] That is, the riser bracket 28 is supported by the slide rail 22 via the converging portion 46. As a result, in this embodiment, it is possible to more effectively prevent the riser bracket 28 from dropping from the slide rail 22.

[0073] The converging wall 47 provided in the converging portion 46 is inclined inward in the seat width direction as it extends forward in the seat front-rear direction. In other words, the converging wall 47 is inclined outward in the seat width direction as it extends rearward in the seat front-rear direction.

[0074] For this reason, the converging wall 47 on the vertical wall portion 34 side may protrude from the outer wall portion 24B of the lower rail 24 of the slide rail 22, but when a large load directed forward in the seat fore-and-aft direction is input to the seat back 16 (see FIG. 1 ) due to a frontal collision of the vehicle or the like, the load is concentrated on the front end portion 32A side of the fixing portion 32 of the riser bracket 28. Therefore, in this embodiment, it is sufficient that the converging wall 47 does not protrude from the outer wall portion 24B of the lower rail 24 of the slide rail 22 on the front end portion 32A side of the fixing portion 32.

[0075] 5 and 6 , when a large load is applied to the seat back 16 toward the front in the seat front-rear direction, the front end 32A side of the fixing portion 32 can come into contact with the shoulder portion 24A1 formed on the lower rail 24, and the riser bracket 28 is supported by the slide rail 22. Therefore, even if a portion of the vertical wall portion 34 side of the converging wall 47 protrudes from the outer wall portion 24B of the lower rail 24 of the slide rail 22, when the large load is applied, the load is concentrated on the front end 32A side of the fixing portion 32 of the riser bracket 28, so that the riser bracket 28 as a whole is supported by the slide rail 22.

[0076] Furthermore, in this embodiment, the front wall portion 48 of the converging portion 46 is formed so as not to protrude substantially from the upper surface 26B of the upper rail 26. As described above, when a large load is input to the seat back 16 (see FIG. 1 ) toward the front in the seat front-rear direction due to a frontal collision of the vehicle or the like, the load is concentrated toward the front end portion 32A of the fixing portion 32 of the riser bracket 28. Therefore, by forming the front wall portion 48 of the riser bracket 28 so as not to protrude substantially from the upper surface 26B of the upper rail 26, the front wall portion 48 is in contact with the upper surface 26B of the upper rail 26 over substantially the entirety. As a result, in this embodiment, it is possible to more reliably prevent the riser bracket 28 from dropping off the slide rail 22.

[0077] In addition, in this embodiment, at the outer end in the seat width direction of the fixed portion 32 of the riser bracket 28, a vertical wall portion 34 is formed upright in the general portion 32B, and a converging wall 47 is formed upright in the converging portion 46.

[0078] This allows the load transmitted from the seat back frame 18 to be transmitted from the general portion 32B to the convergent portion 46 via the vertical wall portion 34 and the convergent wall 47. In other words, in this embodiment, the load transmitted to the riser bracket 28 can be effectively transmitted to the front end portion 32A of the fixed portion 32.

[0079] Here, the converging wall 47 is formed so that it gradually becomes more inward in the seat width direction than the outer wall portion 24B of the slide rail 22 as it moves forward in the seat fore-and-aft direction, thereby preventing the formation of steps in the converging wall 47.

[0080] As a result, in this embodiment, when a load is transmitted to the convergent wall 47, it is possible to prevent stress concentration from occurring at the convergent wall 47. Depending on the configuration of the riser bracket 28, a step may be formed in the convergent wall 47 in the up-down direction or the front-to-rear direction of the seat.

[0081] In this embodiment, a front wall portion 48 stands upright at the front end portion 32A of the fixing portion 32, and the front wall portion 48 is formed to be connected to the converging wall 47. This makes it possible to reinforce the converging wall 47 and also to transmit the load transmitted to the converging wall 47 to the front wall portion 48.

[0082] 3, the convergent wall 47 and the front wall 48 are connected to each other in a curved shape in plan view, and as shown in FIG. 2, a flange 47A is formed at the tip of the convergent wall 47, a flange 48A is formed at the tip of the front wall 48, and the flange 47A of the convergent wall 47 and the flange 48A of the front wall 48 are continuously connected. This makes it possible to prevent stress concentration in the convergent wall 47 and the front wall 48 when a load is transmitted between the convergent wall 47 and the front wall 48.

[0083] 3 and 4, in this embodiment, the riser bracket 28 is formed with a rib 50 that spans the fixed portion 32 and the converging wall 47. This reinforces the vertical wall portion 34, and also enables the load transmitted to the converging wall 47 via the rib 50 to be transmitted to the fixed portion 32 that is fixed to the slide rail 22.

[0084] In this embodiment, the fixing portion 32 of the riser bracket 28 is fixed to the upper surface 26B of the rear end portion 27 of the upper rail 26, and a fastening portion 52 for fixing the riser bracket 28 to the slide rail 22 is provided at least between the front wall portion 48 of the riser bracket 28 and the rib 50.

[0085] The fastening portion 52 is one of the load transmission paths when a load is transmitted from the seat back frame 18, via the riser bracket 28, and then from the slide rail 22 to the vehicle floor 20. The fastening portion 52 is provided between the front wall portion 48 and the rib 50 of the fixed portion 32. The front wall portion 48 and the rib 50 each contribute to reinforcing the vertical wall portion 34 of the fixed portion 32.

[0086] Therefore, in this embodiment, by providing a fastening portion 52, which serves as one of the load transmission paths, between the front wall portion 48 and the rib 50, it is possible to reliably transmit the load input to the riser bracket 28 to the slide rail 22 side.

[0087] In this embodiment, an example has been described in which the vehicle seat frame structure according to this embodiment is applied to the riser bracket 28, but it may also be applied to the riser bracket 30 side, or to the riser brackets 28 and 30.

[0088] Furthermore, in this embodiment, an example in which the vehicle seat is applied to a rear seat has been described, but it goes without saying that the present invention may also be applied to a front seat.

[0089] In addition, the present invention can be implemented with various modifications within the scope of the gist thereof. Furthermore, it goes without saying that the scope of the rights of the present invention is not limited to the above-described embodiment. [Explanation of symbols]

[0090] 10 Vehicle seats 12 seat cushions 14 Cushion frame (seat cushion frame) 14A Rear end (rear end of seat cushion frame in the front-to-rear direction of the seat) 20 Vehicle Floor 22 Slide rail 24 Lower rail 24B Exterior wall 26 Upper Rail 26B Top surface 28 Riser bracket (bracket) 32 Fixed part 32A Front end (front end of the fixing part in the seat longitudinal direction) 32B General section 34 Vertical wall part (first vertical wall part) 46 Convergence section 47 Converging wall (second vertical wall section, converging section) 48 Front wall (converging section) 50 Ribs 52 Fastening part W1 Width dimension (width dimension in the seat width direction in the general section) W2 Width dimension (width dimension in the sheet width direction at the convergence part)

Claims

1. a slide rail provided on a vehicle body floor portion and configured to allow a vehicle seat on which an occupant sits to slide in the front-rear direction of the seat; a bracket connected to an outer side in the seat width direction and a rear end in the seat front-rear direction of a seat cushion frame that constitutes a framework of the seat cushion that supports the lower back and thighs of a seated occupant, and fixed to the slide rail; Equipped with the bracket includes a fixing portion fixed to the slide rail, a converging portion is provided, the converging portion being formed at a front end portion of the fixing portion in the seat front-rear direction, and having a width dimension in the seat width direction set to be shorter than a width dimension in the seat width direction of a general portion other than the front end portion; and The bracket is a first vertical wall portion formed to stand from an outer end of the general portion of the fixing portion in the seat width direction; a second vertical wall portion that stands up from an outer end of the convergent portion of the fixing portion in the sheet width direction and is formed to be connected to the first vertical wall portion; The invention comprises: A vehicle seat frame structure, wherein a front wall portion is formed that stands up at a front end of the fixing portion in the seat front-rear direction and is connected to the second vertical wall portion.

2. A vehicle seat frame structure as described in claim 1, wherein the second vertical wall portion and the front wall portion are connected in a curved shape when viewed in a plane, and the tip of the second vertical wall portion and the tip of the front wall portion are formed to be continuously connected.

3. A slide rail that is provided on the vehicle body floor and enables a vehicle seat on which an occupant sits to slide in the fore-and-aft direction of the seat; a bracket connected to an outer side in the seat width direction and a rear end in the seat front-rear direction of a seat cushion frame that constitutes a framework of the seat cushion that supports the lower back and thighs of a seated occupant, and fixed to the slide rail; Equipped with the bracket includes a fixing portion fixed to the slide rail, a converging portion is provided, the converging portion being formed at a front end portion of the fixing portion in the seat front-rear direction, and having a width dimension in the seat width direction set to be shorter than a width dimension in the seat width direction of a general portion other than the front end portion; and The bracket is a first vertical wall portion formed to stand from an outer end of the general portion of the fixing portion in the seat width direction; a second vertical wall portion that stands up from an outer end of the convergent portion of the fixing portion in the sheet width direction and is formed to be connected to the first vertical wall portion; The invention comprises: a rib is formed on the bracket so as to span between the fixing portion and the second vertical wall portion; The fixing portion has a fastening portion for fixing the bracket to the slide rail between the rib and a front wall portion connected to the second vertical wall portion.

4. A vehicle seat frame structure described in any one of claims 1 to 3, wherein the converging portion is formed so as not to protrude from the outer wall portion provided on the outside of the seat width direction of the slide rail when viewed in a plane.

5. The slide rail is configured to include a lower rail fixed to the vehicle body floor side, and an upper rail arranged inside the lower rail in the seat width direction and slidable relative to the lower rail, 5. The vehicle seat frame structure according to claim 1, wherein the convergent portion is formed so as not to protrude from an upper surface of the upper rail to which the fixing portion is fixed in a plan view.

6. A vehicle seat frame structure described in any one of claims 1 to 5, wherein the second vertical wall portion is formed so that as it moves toward the front side in the fore-and-aft direction of the seat, it gradually becomes more inward in the seat width direction than the outer wall portion provided on the outside of the seat width direction on the slide rail.

7. A vehicle to which the vehicle seat frame structure according to any one of claims 1 to 6 is applied. Sheet for use.

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