JP2023093226A - Seat frame structure for vehicle and seat for vehicle - Google Patents

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

The present invention relates to a vehicle seat frame structure and a vehicle seat.

Patent Literature 1 listed below discloses a technique relating to a 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 has a structure in which a one-person seat and a two-person seat are arranged side by side along the width direction of the vehicle.

A seat back skeleton for supporting the upper body of the occupant seated on the seat cushion is provided on the outside in the width direction of the seat and at the rear end in the longitudinal direction of the seat in the seat cushion frame forming the skeleton of the seat cushion on which the occupant sits. Constituent seat back frames are connected.

A connection bracket is connected to the lower end of the seatback frame, and a riser fixed to a slide rail provided on the vehicle floor is fixed to the connection bracket. The seat cushion frame is attached to the slide rail via the riser and the connection bracket, and the seat cushion frame can move in the vehicle front-rear direction along the slide rail.

Japanese Patent Application Laid-Open No. 2021-112996

However, in the above-described prior art, when a large load (collision load) directed forward in the seat back-and-forth direction is input to the seat back due to, for example, a frontal collision of the vehicle (hereinafter referred to as "frontal collision"). A large load is transmitted to the riser (riser bracket) via the seatback frame and connection bracket.

In the case of rear seats in which a one-seat seat and a two-seat seat are arranged side by side along the width of the vehicle, considering the ease of assembly of the riser to the slide rail, the joint with the seat back should be positioned directly above the slide rail. Therefore, if a large load is transmitted to the riser, the riser may drop below the upper surface of the slide rail.

In view of the above facts, the present invention provides a vehicle seat frame structure and a vehicle seat capable of suppressing the drop of a bracket that connects a seat cushion frame to the slide rail from the slide rail in the event of a vehicle collision. With the goal.

In order to solve the above-mentioned problems, the vehicle seat frame structure according to the first aspect of the present invention includes a slide rail that is provided on the floor of a vehicle body and allows a vehicle seat on which a passenger is seated to slide in the longitudinal direction of the seat. , a bracket coupled to the outer side in the seat width direction and the rear end portion in the front-rear direction of the seat cushion frame constituting the skeleton of the seat cushion for supporting the waist and thighs of a seated occupant, and fixed to the slide rail; and the bracket includes a fixed portion fixed to the slide rail, is formed at a front end portion of the fixed portion in the seat front-rear direction, and has a width dimension in the seat width direction other than the front end portion. A converging portion is provided which is set shorter than the width dimension in the seat width direction of the general portion, which is the portion.

In the vehicle seat frame structure according to the first aspect of the invention, the slide rail and the bracket are provided. The slide rail is provided on the floor of the vehicle body and enables the vehicle seat on which the passenger sits to slide in the longitudinal direction of the seat. The bracket is coupled to the outside in the width direction of the seat and to the rear end in the front-rear direction of the seat cushion frame, which constitutes the skeleton of the seat cushion that supports the waist and thighs of a seated occupant, and is fixed to the slide rail. It is

Here, the bracket includes a fixing portion fixed to the slide rail, and the fixing portion is formed with a converging portion. The converging portion is formed at the front end portion of the fixed portion (in the seat front-rear direction), and the width dimension in the seat width direction is set to be shorter than the width dimension in the seat width direction of the general portion other than the front end portion. there is

When a large load is applied to the seat back in the front-rear direction due to a vehicle frontal collision, etc., the load is transmitted from the seat back frame to the slide rail via the bracket. Then, a moment acts around the portion fixed to the slide rail, and the front end portion of the fixed portion tends to move toward the lower side of the seat.

In the present invention, by providing a converging portion having a width smaller than that of the general portion at the front end portion of the fixed portion fixed to the slide rail, the front end portion of the fixed portion moving toward the lower side of the seat can be , can be supported by the slide rail via the converging portion. This makes it possible to prevent the bracket from dropping from the slide rail.

In addition, regarding "joining" here, the bracket may be directly joined to the seat cushion frame, or may be indirectly joined via a separate member.

The vehicle seat frame structure according to the invention of claim 2 is the vehicle seat frame structure according to the invention of claim 1, wherein the converging portion is arranged outside the slide rail in the seat width direction in a plan view. It is formed so as not to protrude from the provided outer wall.

In the vehicle seat frame structure according to the second aspect of the invention, the converging portion is formed so as not to protrude from the outer wall portion provided on the outer side of the slide rail in the seat width direction in a plan view. Approximately the entire converging portion can be grounded on the slide rail in the event of a frontal collision or the like. That is, the bracket is supported by the slide rail via the converging portion. As a result, it is possible to more effectively suppress the drop of the bracket from the slide rail.

A vehicle seat frame structure according to a third aspect of the invention is the vehicle seat frame structure according to the second aspect of the invention, wherein the slide rails are fixed to the vehicle body floor side, and the lower rails are fixed to the floor side of the vehicle body. and an upper rail disposed on the inner side in the seat width direction of the lower rail and provided slidably with respect to the lower rail, wherein the converging portion protrudes from the upper surface of the upper rail to which the fixing portion is fixed in plan view. It is designed not to

In the vehicle seat frame structure according to the third aspect of the present invention, the slide rail includes 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 arranged inside the lower rail in the seat width direction and is provided slidably with respect to the lower rail. Here, the converging portion is formed so as not to protrude from the upper surface of the upper rail to which the fixing portion is fixed in plan view.

Accordingly, due to a frontal collision of the vehicle or the like, the converging portion is grounded on the upper surface of the upper rail to which the fixing portion is fixed over substantially the entirety. That is, the bracket is supported by the slide rail via the upper rail via the converging portion. Therefore, it is possible to more reliably prevent the bracket from dropping from the slide rail.

A vehicle seat frame structure according to the invention of claim 4 is a vehicle seat frame structure according to any one of claims 1 to 3, wherein the bracket includes the bracket of the fixing portion. A first vertical wall portion erected from an outer end in the seat width direction of the general portion, and an outer end in the seat width direction of the converging portion of the fixing portion and connected to the first vertical wall portion. and a formed second vertical wall portion.

In the vehicle seat frame structure according to the invention recited in claim 4, the bracket includes the first vertical wall portion and the second vertical wall portion. The first vertical wall portion is formed to stand from the seat width direction outer end of the general portion of the fixed portion, and the second vertical wall portion is formed to stand from the seat width direction outer end of the convergent portion of the fixed portion. , is formed so as to be connected to the first vertical wall portion.

In the present invention, by forming and connecting the first vertical wall portion and the second vertical wall portion respectively from the general portion to the converging portion of the fixed portion, the load transmitted from the seat back frame is transferred to the first vertical wall portion. can be transmitted from the general section to the converging section side via the section and the second vertical wall section. That is, it is possible to effectively transmit the load transmitted to the bracket to the front end portion side of the fixed portion.

The vehicle seat frame structure according to the invention of claim 5 is the vehicle seat frame structure according to the invention of claim 4, wherein the second vertical wall portion gradually increases toward the front side in the seat front-rear direction. It is formed so as to be inside in the seat width direction of the outer wall portion provided on the outside in the seat width direction of the slide rail.

In the vehicle seat frame structure according to the fifth aspect of the present invention, the second vertical wall portion is arranged so that the second vertical wall portion gradually becomes more inward in the seat width direction than the outer wall portion of the slide rail toward the front side in the seat front-rear direction. It is formed so that a step is not formed in the second vertical wall portion. Thereby, when a load is transmitted to the second vertical wall portion, it is possible to prevent stress concentration from occurring in the second vertical wall portion.

A vehicle seat frame structure according to the invention of claim 6 is the vehicle seat frame structure according to the invention of claim 4 or 5, wherein the fixed portion is erected at a front end in the seat front-rear direction, and the A front wall portion connected to the second vertical wall portion is formed.

In the vehicle seat frame structure according to the sixth aspect of the invention, the second vertical wall portion is reinforced by forming a front wall portion connected to the second vertical wall portion at the front end of the fixed portion in the seat front-rear direction. In addition, the load transmitted to the second vertical wall portion can be transmitted to the front wall portion. That is, it is possible to effectively transmit the load transmitted to the bracket to the front end portion side of the fixed portion.

The vehicle seat frame structure according to the invention of claim 7 is the vehicle seat frame structure according to the invention of claim 6, wherein the vertical wall portion and the front wall portion are connected in a curved shape in plan view. And, the tip of the vertical wall portion and the tip of the front wall portion are continuously connected.

In the vehicle seat frame structure according to the seventh aspect of the invention, the vertical wall portion and the front wall portion are connected in a curved shape in plan view. Furthermore, the tip of the vertical wall portion and the tip of the front wall portion are continuously connected. Accordingly, in the present invention, when a load is transmitted to the vertical wall portion and the front wall portion, stress concentration can be prevented from occurring in the vertical wall portion and the front wall portion.

The vehicle seat frame structure according to the invention of claim 8 is the vehicle seat frame structure according to any one of claims 4 to 7, wherein the bracket includes the converging portion. A rib is formed across the fixing portion and the second vertical wall portion.

In the vehicle seat frame structure according to the eighth aspect of the invention, the bracket includes the converging portion and the rib is formed so as to span the fixing portion and the second vertical wall portion. The portion is reinforced, and the load transmitted to the second vertical wall portion via the rib can be transmitted to the fixed portion fixed to the slide rail.

According to a ninth aspect of the invention, there is provided a vehicle seat frame structure according to the eighth aspect of the invention, wherein the fixed portion includes the sliding member between the front wall portion and the rib. A fastening portion is provided for fixing the bracket to the rail.

In the vehicle seat frame structure according to the ninth aspect of the invention, since the fixed portion of the bracket is fixed to the slide rail via the fastening portion, the load input to the seat cushion frame is transmitted via the fastening portion of the bracket. transmitted to the slide rail.

In the present invention, the fastening portion, which is one of the load transmission paths when the load is transmitted from the seat back frame to the vehicle body floor from the slide rail via the bracket, is provided between the front wall portion of the fixed portion and the rib. . By providing the fastening portion, which is one of the load transmission paths, between the front wall portion and the rib, it becomes possible to reliably transmit the load input to the bracket to the slide rail side.

A vehicle seat according to the tenth aspect of the invention employs the vehicle seat frame structure according to any one of the first to ninth aspects.

In the vehicle seat according to the tenth aspect of the invention, it is possible to enjoy the effects obtained by the vehicle seat frame structure of the invention.

As described above, in the vehicle seat frame structure and the vehicle seat according to the present invention, it is possible to suppress the bracket that connects the seat cushion frame to the slide rail from dropping from the slide rail in the event of a vehicle collision.

1 is a perspective view showing a vehicle seat according to this embodiment; FIG. 1 is an enlarged perspective view of a main part for explaining a main part of a vehicle seat according to this embodiment; FIG. FIG. 2 is an enlarged plan view of a main part for explaining a main part of the vehicle seat according to the present embodiment; FIG. 2 is an enlarged cross-sectional view of a main part for explaining a main part of the vehicle seat according to the present embodiment; FIG. 3 is an enlarged perspective view of a main portion corresponding to FIG. 2 when a large load directed forward in the longitudinal direction of the seat is input to the seat back of the vehicle seat according to the present embodiment; FIG. 5 is an enlarged cross-sectional view of a main portion corresponding to FIG. 4 when a large load directed forward in the longitudinal direction of the seat is input to the seat back of the vehicle seat according to the present embodiment; FIG. 4 is an enlarged plan view of a main part corresponding to FIG. 3 as a comparative example; 5 is an enlarged cross-sectional view of a main part corresponding to FIG. 4 as a comparative example; FIG. 6 is an enlarged perspective view of a main part corresponding to FIG. 5 as a comparative example; FIG. FIG. 7 is an enlarged cross-sectional view of a main part corresponding to FIG. 6 as a comparative example;

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. An arrow FR, an arrow UP, an arrow IN, and an arrow OUT shown in each figure indicate the front (advance direction), the upper side, the inner side, and the outer side of the vehicle, respectively. In the following description, when simply using front-rear, left-right, and up-down directions, front-rear in the vehicle front-rear direction, left and right in the vehicle left-right direction (vehicle width direction), and up and down in the vehicle vertical direction will be indicated, unless otherwise specified. do.

(Structure of vehicle seat frame structure)
First, the configuration of a vehicle seat to which the vehicle seat frame structure according to the present embodiment is applied will be described.

The vehicle seat is used, for example, as a second-row or third-row seat in a vehicle such as a minivan. The vehicle seat in the second or third row has a structure in which a one-person seat and a two-person seat are arranged side by side in the width direction of the vehicle. It may be arranged on either side of the vehicle, left or right. In the following description, a seat for one person is taken as an example.

As shown in FIG. 1, a vehicle seat 10 to which the vehicle seat frame structure according to the present embodiment is applied is a cushion that forms the skeleton of a seat cushion 12 that supports the waist and thighs of a seated occupant. It is provided with a frame 14 and a seatback frame 18 that constitutes the framework of a seatback 16 that supports the upper body of a seated occupant.

A lower end portion 18A of the seatback frame 18 is connected to the rear end portion 14A of the cushion frame 14, and a pair of headrest stay holders 18B1 to which a headrest (not shown) is attached is attached to the upper end portion 18B of the seatback frame 18. is provided. The cushion frame 14 and the seatback frame 18 are configured by, for example, joining together members made of sheet metal, members made of metal pipes, or the like, and each has a rectangular frame shape.

On the other hand, a pair of left and right slide rails 22 are fixed to a vehicle floor (body floor) 20 by fastening means such as bolts. The vehicle seat 10 is connected to the slide rails 22 , and the vehicle seat 10 is slidable along the slide rails 22 in the longitudinal direction of the vehicle. The left and right slide rails 22 have substantially the same configuration. For this reason, in the following description, when it is not necessary to distinguish between left and right slide rails 22, only one slide rail 22 will be described.

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 constitutes the outer shape of the slide rail 22, and as shown in FIG. 4, when cut along the width direction, it has a substantially U shape with an open upper side. The upper rail 26 has a generally inverted U shape with an open bottom when cut along the width direction, and is arranged inside the lower rail 24 in the width direction.

More specifically, at both ends of the lower rail 24 in the width direction, a shoulder portion 24A1 projecting substantially horizontally inward in the width direction and a shoulder portion 24A1 extending downward from the tip of the shoulder portion 24A1 Folded portions 24A each including a hanging portion 24A2 are provided.

In addition, at both ends of the upper rail 26 in the width direction, there are folded portions that project substantially horizontally outward in the width direction, extend upward, and bend inward in the width direction at the center. 26A are formed respectively. The folded portions 26A of the upper rails 26 are arranged within the folded portions 24A of the lower rails 24, thereby restricting the upward movement of the upper rails 26 with respect to the lower rails 24. As shown in FIG.

On the other hand, as shown in FIG. 1, riser brackets (brackets) 28 and 30 are fixed to upper surfaces 26B of the rear ends 27 of the left and right upper rails 26, respectively. The riser brackets 28 and 30 are made of sheet metal, for example.

As shown in FIG. 3, the left and right riser brackets 28 and 30 have a substantially rectangular shape in a plan view. and a vertical wall portion (first vertical wall portion) 34 that rises upward from the outer end of the direction. Although only the riser bracket 28 is shown in FIG. 3, the riser bracket 30 has substantially the same configuration as the riser bracket 28.

A rectangular connecting plate 36 is bridged between the left and right riser brackets 28 and 30 . The connecting plate 36 is made of sheet metal, for example, and is arranged with the vehicle vertical direction as the plate thickness direction. Both ends of the connecting plate 36 in the longitudinal direction are fixed to the upper surface 26B of the upper rail 26 together with the left and right riser brackets 28 and 30 by bolting or the like, whereby the left and right slide rails 22 are reinforced.

As shown in FIG. 1, the lower end portion 18A of the seatback frame 18 is connected to the vertical wall portion 34 of the riser bracket 30 so as to be rotatable about an axis along the width direction of the vehicle. On the other hand, a connection bracket 38 is fixed to the vertical wall portion 34 of the riser bracket 28 on the outside in the seat width direction. The connection bracket 38 is made of sheet metal, for example, and is arranged with the vehicle width direction as the plate thickness direction.

As shown in FIGS. 1 and 3, the lower end portion 38A of the connection bracket 38 is fixed to the vertical wall portion 34 of the riser bracket 28 by fastening with a bolt 40 and a nut 42. , the lower end portion 18A of the seat back frame 18 is connected via a well-known reclining mechanism 44. As shown in FIG. Thereby, the inclination angle of the seat back 16 with respect to the connection bracket 38 can be adjusted.

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

In this embodiment, a connection bracket 38 is provided separately from the riser bracket 28 on the riser bracket 28 side, and the connection bracket 38 is connected to the lower end portion 18A of the seatback frame 18. , the connection bracket 38 does not necessarily have to be separate from the riser bracket 28 . In other words, although not shown, the connection bracket 38 may be integrated with the riser bracket 28 .

In the present embodiment, as shown in FIG. 3, the riser bracket 28 is provided with a converging portion 46 at the front end portion 32A of the fixing portion 32 in the seat front-rear direction. In the converging portion 46, the width dimension W2 is set to be shorter than the width dimension W1 along the seat width direction of the general portion 32B, which is a part other than the converging portion 46 in the fixing portion 32. As shown in FIG.

Further, 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. Note that 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 substantially protrude from the upper surface 26B of the upper rail 26 in plan view.

Here, it is preferable that the front wall portion 48 is formed so as not to completely protrude from the upper surface 26B of the upper rail 26 in a plan view. isn't it. Therefore, at least the converging wall 47 side, which will be described later, of the front wall portion 48 should be arranged above the upper surface 26B of the upper rail 26 .

On the other hand, as shown in FIGS. 2 and 3, the converging portion 46 has a converging wall (second vertical wall portion) 47 that rises upward from the outer end in the seat width direction. The converging wall 47 is connected to the vertical wall portion 34 formed in the general portion 32B of the fixed portion 32, and as shown in FIG. It is formed by

Note that the converging wall 47 may be formed so as to gradually become inward in the seat width direction as it goes forward in the seat front-rear direction. may be formed into a shape. Further, depending on the configuration of the riser bracket 28, the converging wall 47 may be formed with a step in the vertical direction of the seat or in the longitudinal direction of the seat.

By the way, as shown in FIG. 2 , a front wall portion (converging portion) 48 is erected at the front end of the fixed portion 32 in the seat front-rear direction. The front wall portion 48 is formed so as to be connected to the converging wall 47 . As shown in FIG. 3, the converging wall 47 and the front wall portion 48 are connected in a curved shape in plan view, and the tip of the converging wall 47 and the tip of the front wall portion 48 are continuously connected. It is

In this embodiment, as shown in FIGS. 2 and 4, flange portions 47A and 48A that bend inward in the seat width direction are formed at the ends of the converging wall 47 and the front wall portion 48, respectively. The flange portion 47A of the converging wall 47 and the flange portion 48A of the front wall portion 48 are continuously connected. A flange portion 34A is also formed at the tip of the vertical wall portion 34, and the flange portion 34A of the vertical wall portion 34 and the flange portion 47A of the converging wall 47 are also continuously connected.

As shown in FIGS. 3 and 5, the riser bracket 28 is formed with a rib 50 extending over the fixed portion 32 and the converging wall 47 and protruding upward from the seat. Here, 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.

Therefore, in the present embodiment, in order to form the rib 50, a recess 51 is formed on the rear surface 32D side of the riser bracket 28 by the amount of protrusion due to the formation of the rib 50 on the front surface 32C side of the riser bracket 28. Become. 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 formed by welding or the like. In this case, the recess 51 is not formed.

Here, 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. Further, 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 at least between the front wall portion 48 and the rib 50 of the riser bracket 28 . Note that the fastening portion 52 is fastened with a bolt 54 and a nut 56 .

(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 the present embodiment is applied will be described.

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

As a comparative example, for example, as shown in FIG. 7, in the riser bracket 100, the fixed portion 102 has a substantially rectangular shape in plan view, and has substantially the same width dimension W3 from the front end portion 102A to the rear end portion 102B. Consider the set case. Here, as shown in FIG. 8 , the vertical wall portion 103 formed on the seat width direction outer side of the riser bracket 100 protrudes from the outer wall portion 106A of the lower rail 106 forming the lower portion of the slide rail 104 .

In general, although not shown, when a large load directed forward in the seat back and forth direction is input to the seat back due to a frontal collision of the vehicle, etc., the load is transmitted from the seat back frame to the slide rail via the riser bracket. However, in the fixed portion of the riser bracket, a moment acts around the portion fixed to the slide rail, and the load concentrates on the front end side of the fixed portion of the riser bracket.

In the comparative example, when the load concentrates on the front end portion 102A side of the riser bracket 100 shown in FIG. 7, the front end portion 102A of the riser bracket 100 moves toward the seat lower side, and the riser bracket 100 tries to fall obliquely forward. do.

In this case, vertical wall portion 103 of riser bracket 100 protrudes from outer wall portion 106A of slide rail 104 as shown in FIG. There is a possibility that the rail 104 will drop below the upper surface 106B.

On the other hand, in the present embodiment, as shown in FIGS. 3 and 4, in the vehicle seat 10, the front end portion 32A of the fixed portion 32 of the riser bracket 28 at the center portion in the vehicle width direction has a width dimension W2. is set shorter than the width dimension W1 of the general portion 32B. A converging wall 47 provided in the converging 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 converging portion 46 extends from the upper surface 26B of the upper rail 26. It is formed so that it does not protrude.

With the configuration described above, in the present embodiment, a large load directed forward in the seat back-and-forth direction is input to the seat back 16 due to a frontal collision of the vehicle or the like. Even if part of the large load is transmitted to the riser bracket 28 located on the side, the converging portion 46 of the riser bracket 28 can contact the slide rail 22 almost entirely.

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

The converging wall 47 provided in the converging portion 46 is inclined inward in the seat width direction toward the front side in the seat front-rear direction. That is, the converging wall 47 inclines outward in the seat width direction toward the rear side in the seat front-rear direction.

Therefore, the vertical wall portion 34 side of the converging wall 47 may protrude from the outer wall portion 24B of the lower rail 24 of the slide rail 22. When a large load directed forward in the front-rear direction is input, the load is concentrated on the front end portion 32</b>A side of the fixed portion 32 of the riser bracket 28 . Therefore, in the present embodiment, the converging wall 47 should 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 fixed portion 32 .

On the front end portion 32A side of the fixing portion 32, when a large load directed forward in the seat back-and-forth direction is input to the seat back 16, as shown in FIGS. The riser bracket 28 is supported by the slide rail 22 and can be grounded on the portion 24A1. 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, the fixed portion 32 of the riser bracket 28 will not move when the large load is input. , the load concentrates on the front end portion 32A side, the riser bracket 28 is supported by the slide rail 22 as a whole.

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 directed forward in the seat back-and-forth direction is input to the seat back 16 (see FIG. 1) due to a frontal collision of the vehicle or the like, the front end portion of the fixed portion 32 of the riser bracket 28 may be displaced. The load concentrates on the 32A side. Therefore, the front wall portion 48 of the riser bracket 28 is formed so as not to substantially protrude from the upper surface 26B of the upper rail 26 , so that the front wall portion 48 substantially extends over the upper surface 26B of the upper rail 26 . will be grounded. Accordingly, in the present embodiment, it is possible to more reliably prevent the riser bracket 28 from dropping from the slide rail 22 .

In the present embodiment, the vertical wall portion 34 is erected at the general portion 32B at the seat width direction outer end of the fixing portion 32 of the riser bracket 28, and the converging wall 47 is erected at the converging portion 46. formed.

Thereby, the load transmitted from the seatback frame 18 can be transmitted from the general portion 32B to the converging portion 46 side via the vertical wall portion 34 and the converging wall 47 . That is, in the present embodiment, the load transmitted to the riser bracket 28 can be effectively transmitted to the front end portion 32A side of the fixed portion 32 .

Here, the converging wall 47 is formed so as to gradually become more inward in the seat width direction than the outer wall portion 24B of the slide rail 22 toward the front side in the seat front-rear direction, and a step is formed in the converging wall 47. I try not to.

Thereby, in the present embodiment, when a load is transmitted to the converging wall 47, stress concentration can be prevented from occurring in the converging wall 47. FIG. Depending on the configuration of the riser bracket 28, the converging wall 47 may have a step in the vertical direction of the seat or in the longitudinal direction of the seat.

Further, in this embodiment, a front wall portion 48 is erected from the front end portion 32A of the fixed portion 32, and the front wall portion 48 is formed to be connected to the converging wall 47. As shown in FIG. Thereby, in this embodiment, the converging wall 47 can be reinforced, and the load transmitted to the converging wall 47 can be transmitted to the front wall portion 48 .

Further, in this embodiment, as shown in FIG. 3, the converging wall 47 and the front wall portion 48 are connected in a curved shape in plan view, and as shown in FIG. 47A is formed, and a flange portion 48A is formed at the tip of the front wall portion 48, and the flange portion 47A of the converging wall 47 and the flange portion 48A of the front wall portion 48 are continuously connected. As a result, in the present embodiment, stress concentration can be prevented from occurring in the converging wall 47 and the front wall portion 48 when a load is transmitted to the converging wall 47 and the front wall portion 48 .

Further, in the present embodiment, as shown in FIGS. 3 and 4, the riser bracket 28 is formed with a rib 50 spanning the fixing portion 32 and the converging wall 47 . As a result, in this embodiment, the vertical wall portion 34 is reinforced, and the load transmitted to the converging wall 47 via the rib 50 can be transmitted to the fixed portion 32 fixed to the slide rail 22. It becomes possible.

In the present 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, so that the slide rail 22 is at least between the front wall portion 48 of the riser bracket 28 and the rib 50. A fastening portion 52 for fixing the riser bracket 28 is provided.

The fastening portion 52 serves as one of load transmission paths when a load is transmitted from the seatback frame 18 to the vehicle floor 20 via the riser bracket 28 and the slide rails 22 . The fastening portion 52 is provided between the front wall portion 48 of the fixed portion 32 and the rib 50 . The front wall portion 48 and the ribs 50 each contribute to reinforcing the vertical wall portion 34 of the fixed portion 32 .

Therefore, in the present embodiment, by providing the fastening portion 52, which is one of the load transmission paths, between the front wall portion 48 and the rib 50, the load input to the riser bracket 28 is reliably transferred to the slide rail 22 side. can be transmitted.

In this embodiment, an example in which the vehicle seat frame structure according to this embodiment is applied to the riser bracket 28 has been described. may be applied.

Further, in the present embodiment, an example in which the vehicle seat is applied to the rear seat has been described, but it is needless to say that the vehicle seat may be applied to the front seat.

In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. In addition, it goes without saying that the scope of rights of the present invention is not limited to the above embodiments.

10 vehicle seat 12 seat cushion 14 cushion frame (seat cushion frame)
14A rear end (rear end of seat cushion frame in front-rear direction of seat)
20 vehicle floor 22 slide rail 24 lower rail 24B outer wall portion 26 upper rail 26B upper surface 28 riser bracket (bracket)
32 fixed portion 32A front end portion (front end portion in the seat front-rear direction of the fixed portion)
32B general part 34 vertical wall part (first vertical wall part)
46 converging portion 47 converging wall (second vertical wall portion, converging portion)
48 front wall part (converging part)
50 Rib 52 Fastening portion W1 Width dimension (width dimension in the seat width direction at the general portion)
W2 Width dimension (width dimension in the sheet width direction at the converging portion)

Claims (10)

a slide rail that is provided on the floor of the vehicle body and allows the vehicle seat on which the occupant sits to slide in the longitudinal direction of the seat;
a bracket coupled to the outer side in the seat width direction and the rear end portion in the front-rear direction of the seat cushion frame constituting the skeleton of the seat cushion for supporting the waist and thighs of a seated occupant and fixed to the slide rail; ,
with
The bracket includes a fixing portion fixed to the slide rail,
A converging portion is provided at a front end portion of the fixed portion in the seat front-rear direction, the width dimension of the seat width direction being set to be shorter than the width dimension of the seat width direction of the general portion other than the front end portion. seat frame structure for a vehicle with 2. The vehicle seat frame structure according to claim 1, wherein the converging portion is formed so as not to protrude from an outer wall portion provided outside in the seat width direction of the slide rail in a plan view. The slide rail includes a lower rail fixed to the floor of the vehicle body, and an upper rail disposed inside the lower rail in the seat width direction and slidable with respect to the lower rail,
3. The vehicle seat frame structure according to claim 2, wherein the converging portion is formed so as not to protrude from an upper surface of the upper rail to which the fixing portion is fixed in plan view. The bracket is
a first vertical wall portion erected from an outer end in the seat width direction of the general portion of the fixed portion;
a second vertical wall portion erected from an outer end in the seat width direction of the converging portion of the fixed portion and formed to be connected to the first vertical wall portion;
The vehicle seat frame structure according to any one of claims 1 to 3, comprising: The second vertical wall portion is formed so as to gradually become inner in the seat width direction than an outer wall portion provided on the outer side in the seat width direction of the slide rail toward the front side in the seat front-rear direction. 5. A vehicle seat frame structure according to Item 4. 6. The vehicle seat frame structure according to claim 4, wherein a front wall portion is formed at a front end of the fixed portion in the seat front-rear direction and stands upright and is connected to the second vertical wall portion. 7. The second vertical wall portion and the front wall portion are connected in a curved shape in plan view, and the tip of the second vertical wall portion and the tip of the front wall portion are continuously connected. 2. The vehicle seat frame structure according to . The vehicle seat frame structure according to any one of claims 4 to 7, wherein a rib is formed on the bracket so as to extend over the fixing portion and the second vertical wall portion. 9. The vehicle seat frame structure according to claim 8, wherein the fixing portion is provided with a fastening portion for fixing the bracket to the slide rail between a front wall portion connected to the second vertical wall portion and the rib. . A vehicle seat to which the vehicle seat frame structure according to any one of claims 1 to 9 is applied.

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