JP2023167612A - vehicle seat - Google Patents

Abstract

To obtain a vehicle seat which can improve the balance of load allotment at the engagement part of an upper rail and a lower rail when a tensile load works on a belt anchor bolt.SOLUTION: The top face side of the top wall part 16A of an upper rail 16 keeps the joint of the rail joint wall part 50A of a belt anchor bracket 50, and the outside vertical wall part 50B of the rail joint wall part 50A of the belt anchor bracket 50 keeps the linkage of a buckle device 44 by a belt anchor bolt 56. A joint object part 52 to be joined with the top wall part 16A of an upper rail 16 at a bolt corresponding region 50X and its seat rear side arranged at a position in seat longitudinal directions equivalent to the belt anchor bolt 56 at the rail joint wall part 50A keeps joined by weld only at a part offset to the seat width direction inner end part 16A1 of the top wall part 16A of the upper rail 16.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle seat.

Patent Document 1 listed below discloses a seat track device for a vehicle seat. This seat track device includes a belt anchor bracket to which a seat belt anchor is fastened, and the belt anchor bracket is joined to the widthwise central portion of the upper rail.

Japanese Patent Application Publication No. 2010-105533

However, in the above prior art, when a tensile load is applied to the belt anchor, the load acting on the left and right engaging portions between the upper rail and the lower rail is larger on the outer side in the seat width direction, so the engagement between the upper rail and the lower rail is The load distribution at the joint becomes unbalanced.

In consideration of the above facts, the present invention makes it possible to obtain a vehicle seat that can improve the balance of load sharing at the engagement portion between the upper rail and the lower rail when a tensile load is applied to the belt anchor bolt. It is a purpose.

A vehicle seat according to the present invention according to claim 1 includes: a lower rail fixed to a vehicle body floor; an upper rail slidably engaged with the lower rail in a seat longitudinal direction; and a tongue plate provided on a seat belt. a buckle device with which the upper rail is engaged, a rail joint wall portion joined to the upper surface side of the upper wall portion of the upper rail, and a rail joint wall portion extending upwardly from the outer end in the seat width direction of the rail joint wall portion to engage the buckle device; A vertical wall portion connected by a belt anchor bolt, and a bracket having a vertical wall portion, the bolt corresponding area being disposed in the rail joint wall portion at a position in the front and rear direction of the seat equivalent to the belt anchor bolt, and the seat thereof. A portion to be joined to the upper wall of the upper rail in the rear region is joined by welding only to a portion of the upper wall of the upper rail that is offset toward the inner end in the seat width direction.

According to the above configuration, the upper rail is slidably engaged with the lower rail fixed to the vehicle floor in the front-rear direction of the seat. Meanwhile, a tongue plate provided on the seat belt is engaged with a buckle device. In addition, the rail joint wall of the bracket is joined to the upper surface side of the upper wall of the upper rail, and a buckle is attached to the vertical wall of the bracket that extends upward from the outer end in the seat width direction of the rail joint wall. The devices are connected by belt anchor bolts. Here, in the rail joint wall part, the bolt corresponding area located at the same position in the seat front and rear direction as the belt anchor bolt and the part to be joined to the upper wall part of the upper rail in the area on the rear side of the seat are connected to the upper rail. It is joined by welding only to a portion of the upper wall portion that is offset toward the inner end in the seat width direction. As a result, when a tensile load is applied to the belt anchor bolt in the diagonally forward direction above the seat, compared to a comparative example in which the rail joint wall of the bracket is joined at the widthwise center of the upper wall of the upper rail, the upper rail Also, it is possible to increase the ratio of the load shared by the engagement portion on the inner side of the lower rail in the seat width direction. Therefore, when a tensile load is applied to the belt anchor bolt, the load sharing between the left and right engaging portions between the upper rail and the lower rail is well balanced.

In the vehicle seat of the present invention according to claim 2, in the configuration according to claim 1, the joined portion is joined by welding only to the inner end in the seat width direction of the upper wall portion of the upper rail. .

According to the above configuration, the bolt corresponding area of the rail joint wall and the part to be joined in the area on the rear side of the seat are joined by welding only to the inner end in the seat width direction of the upper wall of the upper rail. When a tensile load is applied to the anchor bolt, the load can be effectively shared between the engaging portions of the upper rail and the lower rail on the inner side in the seat width direction.

In the vehicle seat of the present invention according to claim 3, in the configuration according to claim 1 or 2, a region of the rail joint wall portion on the seat front side relative to the bolt corresponding region is connected to the upper rail. It is joined to the widthwise center of the upper wall.

According to the above configuration, when a tensile load is applied to the belt anchor bolt, it is possible to improve the balance of load sharing at the engagement part between the upper rail and the lower rail, and also to make the front part of the rail joint wall part It is possible to create a well-balanced bonded state with respect to the material.

As explained above, the vehicle seat according to the present invention has an excellent advantage of being able to improve the balance of load sharing at the engagement portion between the upper rail and the lower rail when a tensile load is applied to the belt anchor bolt. have an effect.

FIG. 1 is a perspective view showing a schematic configuration of a vehicle seat according to an embodiment. FIG. 2 is an enlarged cross-sectional view showing a section taken along line 2-2 in FIG. 1; FIG. 2 is an enlarged and simplified plan view illustrating the state of connection between the belt anchor bracket and the upper rail of FIG. 1;

Hereinafter, a vehicle seat 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Note that some symbols may be omitted in each figure to make the drawings easier to read. Further, an arrow FR shown as appropriate in each figure indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow RH indicates the right side of the vehicle. Hereinafter, when referring to directions such as front, rear, top, bottom, left and right, unless otherwise specified, this refers to front and back in the vehicle front and back direction, up and down in the vehicle up and down direction, and left and right in the vehicle left and right direction (vehicle width direction). In the following description, the outer side in the vehicle width direction will be referred to as the outer side, and the inner side in the vehicle width direction will be referred to as the inner side.

(composition)
As shown in FIG. 1, the vehicle seat 10 includes a pair of left and right slide rails 12, a seat cushion 20 forming a seating area, and a lower end connected to the rear end of the seat cushion 20 to form a backrest. It includes a seat back 22, a lifter mechanism 30 that moves the seat cushion 20 up and down with respect to the left and right slide rails 12, and a buckle device 44 for the seat belt 40. A headrest 24 is attached to the upper end of the seat back 22. Further, a portion of the lower side surface of the seat back 22 and a portion of the side surface of the seat cushion 20 are covered by a side finisher 25 (not shown in FIG. 2).

Note that this vehicle seat 10 is provided so that the occupant is seated facing the front side of the vehicle, and the vehicle seat 10 is arranged in the front, rear, top, bottom, left and right directions of the vehicle. is consistent with the direction of Further, in this embodiment, the vehicle seat 10 is, for example, a driver's seat of a right-hand drive vehicle.

The pair of left and right slide rails 12 include a lower rail 14 and an upper rail 16. The lower rail 14 is arranged with the seat longitudinal direction as its longitudinal direction. FIG. 2 shows an enlarged cross-sectional view of the section taken along line 2-2 in FIG. As shown in FIG. 2, the lower rail 14 includes a bottom plate portion 14A fixed to the vehicle body floor 18, a pair of side wall portions 14B standing from both widthwise ends of the bottom plate portion 14A, and an upper end of the pair of side wall portions 14B. It has a pair of side upper wall parts 14C that are bent and extended inward in the width direction from the side upper wall parts 14C, and a pair of hanging wall parts 14D that are suspended from the inner ends of the pair of side upper wall parts 14C. The lower rail 14 is configured such that a guide groove 14G that opens above the seat is formed between a pair of hanging wall portions 14D.

The ends of the lower rail 14 on both sides in the front-rear direction of the seat shown in FIG. 28 (see FIG. 2), and is fixed to the vehicle body floor 18 by. As shown in FIG. 2, a ring-shaped spacer 27 is arranged between the lower rail 14 and the vehicle body floor 18 on the outer peripheral side of the bolt 26, for example.

As shown in FIG. 1, the upper rail 16 is arranged with the seat longitudinal direction as its longitudinal direction. As shown in FIG. 2, the upper rail 16 includes an upper wall portion 16A provided at the center in the width direction, a pair of side wall portions 16B hanging down from both ends of the upper wall portion 16A in the width direction, and a pair of side wall portions. It has a pair of folded portions 16C which are bent outward in the width direction from the lower end of 16B and folded back upward. The upper wall portion 16A is arranged with the vertical direction as the thickness direction, and has a flat plate shape and an elongated rectangular shape in plan view. In addition, as an example, a reinforcing panel 19 is joined to the lower surface side of the rear portion of the upper wall portion 16A in the seat front-rear direction. The pair of side wall portions 16B are inserted between the pair of hanging wall portions 14D of the lower rail 14. Further, the upper end portions of the pair of folded portions 16C are respectively arranged between the side wall portion 14B and the hanging wall portion 14D of the lower rail 14.

The upper rail 16 configured in this manner is slidably engaged with the lower rail 14 in the seat longitudinal direction while the pair of side wall portions 16B are guided by the pair of hanging wall portions 14D of the lower rail 14. Here, the pair of side wall portions 16B and the pair of folded portions 16C of the upper rail 16, the pair of side upper wall portions 14C and the pair of hanging wall portions 14D of the lower rail 14 are the engagement portion 15L between the upper rail 16 and the lower rail 14. , 15R. In the figure, the reference numeral 15L is given to the engagement part between the upper rail 16 and the lower rail 14 on the outside in the seat width direction (on the left side in the figure), and the engagement part on the inside in the seat width direction (on the right side in the figure) between the upper rail 16 and the lower rail 14 is designated as 15L. The engaging portion is designated by the reference numeral 15R. Further, the sliding of the upper rail 16 with respect to the lower rail 14 is normally regulated by a slide lock mechanism (not shown), and by operating the lock release lever 17 shown in FIG. 1, the slide restriction by the slide lock mechanism is released. It is supposed to be done.

The lifter mechanism 30 is provided between the upper rail 16 and a side frame (not shown) of the seat cushion 20. The lifter mechanism 30 is configured to include a link mechanism 32, although a detailed explanation will be omitted since it has a known configuration.

A buckle device 44 is disposed above the rear of the left (inner side in this case) upper rail 16 via a belt anchor bracket 50 serving as a bracket. The buckle device 44 includes a stay 46 attached to the belt anchor bracket 50 and a buckle 48 fixed to the upper end of the stay 46. The buckle 48 is configured to be engaged with a tongue plate 42 provided on a seat belt 40 of a three-point seat belt device.

The seat belt 40 has one longitudinal end secured to the vehicle floor 18 on the outer side of the vehicle seat 10, and the other longitudinal end a slip joint attached to the upper end of a B-pillar (not shown) of the vehicle body. (not shown). The other longitudinal end of the seatbelt 40 is locked to a take-up shaft of a seatbelt retractor (not shown) fixed to the lower end of the B-pillar. When an occupant seated on the seat cushion 20 connects the tongue plate 42 to the buckle 48, the occupant is restrained by the seat belt 40.

On the other hand, the belt anchor bracket 50 extends upward from a rail joint wall 50A joined to the upper surface side of the rear part of the upper wall 16A of the upper rail 16 and an outer end in the seat width direction of the rail joint wall 50A. It has an outer vertical wall part 50B as a vertical wall part, and an inner vertical wall part 50C extending upward from the inner end in the seat width direction of the rail joining wall part 50A. Note that, as an example, the inner vertical wall portion 50C is not provided on the rear end side of the belt anchor bracket 50 (see FIG. 3), and constitutes a part of the link mechanism 32 described above.

As shown in FIGS. 1 and 2, the lower end of the stay 46 of the buckle device 44 described above is connected to the upper end of the outer vertical wall portion 50B by a belt anchor bolt 56 and a nut 58. On the other hand, as shown in FIG. 1, the rail joint wall portion 50A is formed in a long plate shape, and is arranged with the vertical direction as the plate thickness direction and the seat longitudinal direction as the longitudinal direction. FIG. 3 shows an enlarged and simplified plan view of the joined state of the belt anchor bracket 50 and the upper rail 16.

As shown in FIG. 3, a bolt corresponding area 50X (area between two two-dot chain lines in the figure) and a bolt corresponding area 50X (area between two dashed double-dashed lines in the figure) are arranged at the same position in the seat longitudinal direction as the belt anchor bolt 56 in the rail joint wall 50A; The joined portion 52 that is joined to the upper wall portion 16A of the upper rail 16 in the region 50Z on the rear side of the seat is offset to the inner end 16A1 side in the seat width direction (right side in FIG. 3) of the upper wall portion 16A of the upper rail 16. They are joined by welding only in the parts that have been welded.

To explain more specifically, the bolt-corresponding region 50X of the rail joint wall 50A and the joined portion 52 in the region 50Z on the rear side of the seat are welded only to the inner end 16A1 in the seat width direction of the upper wall 16A of the upper rail 16. are joined by. For this welding, for example, arc welding or laser welding can be applied. In addition, in FIGS. 2 and 3, a welded portion between the joined portion 52 of the rail joining wall portion 50A and the upper wall portion 16A of the upper rail 16 is indicated by a reference numeral 60. In FIG. 3, the welded portion 60 refers to a weld bead portion (a portion similar to the welded portion 52), and as an example, extends linearly in the front-rear direction of the seat.

On the other hand, a region 50F of the rail joint wall portion 50A that is closer to the front of the seat than the bolt corresponding region 50X is joined to the widthwise central portion of the upper wall portion 16A of the upper rail 16 by welding (at welded portions 62 and 64), for example. ing. For this welding, for example, arc welding or laser welding can be applied. The welded portions 62 and 64 refer to welded bead portions in FIG. 3, and extend linearly in the front-rear direction of the seat, for example. The welded portion 62 is provided at a portion slightly away from the front end of the bolt compatible area 50X (more specifically, approximately the length of the bolt compatible area 50X in the seat longitudinal direction), and the welded portion 64 is provided at a portion that is slightly away from the front end of the bolt compatible area 50X. It is provided near the front end of the section 50A.

(action and effect)
Next, the functions and effects of this embodiment will be explained.

In the vehicle seat 10 shown in FIG. 1, the rail joint wall 50A of the belt anchor bracket 50 is joined to the upper surface side of the upper wall 16A of the upper rail 16, and the outer vertical side of the rail joint wall 50A of the belt anchor bracket 50 is A buckle device 44 is connected to the wall portion 50B by a belt anchor bolt 56. Therefore, when a tensile load F is applied from the buckle device 44 to the belt anchor bolt 56, the load F is transmitted to the upper rail 16 via the belt anchor bracket 50.

Here, as shown in FIGS. 2 and 3, in the rail joint wall portion 50A, the bolt corresponding area 50X located at the same position in the seat longitudinal direction as the belt anchor bolt 56 and the area 50Z on the rear side of the seat are connected to the upper rail. The joined portion 52 to be joined to the upper wall portion 16A of the upper rail 16 is welded only to a portion of the upper wall portion 16A of the upper rail 16 that is offset toward the inner end 16A1 side in the seat width direction (right side in the figure). There is. As a result, when a tensile load F (see FIG. 2) is applied to the belt anchor bolt 56 in the diagonally forward direction above the seat, for example, the rail joint wall portion (50A) of the belt anchor bracket (50) is moved above the upper rail (16). Compared to a comparative example in which the wall portion (16A) is joined only at the center portion in the width direction, the load f2 shared by the engagement portion 15R of the upper rail 16 and the lower rail 14 on the inner side in the seat width direction (right side in the figure) is You can increase the ratio.

In particular, in this embodiment, the joined portion 52 of the rail joint wall portion 50A is joined by welding only to the inner end portion 16A1 in the seat width direction of the upper wall portion 16A of the upper rail 16. When a tensile load F acts on the belt anchor bolt 56, the load f2 can be effectively shared by the engaging portion 15R of the upper rail 16 and the lower rail 14 on the inner side in the seat width direction. That is, when a tensile load F acts on the belt anchor bolt 56, the load f1 acts on the outer engagement portion 15L of the upper rail 16 and the lower rail 14 in the seat width direction and the inner engagement portion of the upper rail 16 and lower rail 14 in the seat width direction. The load f2 acting on 15R can be made approximately equal. Therefore, when a tensile load F acts on the belt anchor bolt 56, the load sharing between the left and right engaging portions 15L and 15R of the upper rail 16 and lower rail 14 is well balanced.

Further, in this embodiment, as shown in FIG. 3, a region 50F of the rail joint wall portion 50A on the seat front side than the bolt corresponding region 50X is connected to the upper wall portion 16A of the upper rail 16 at the welding portions 62 and 64. It is joined at the center in the width direction. Therefore, in this embodiment, when a tensile load F (see FIG. 2) is applied to the belt anchor bolt 56, the balance of load sharing between the left and right engaging portions 15L and 15R between the upper rail 16 and the lower rail 14 is improved. At the same time, the front portion of the rail joint wall portion 50A can be joined to the upper rail 16 in a well-balanced manner.

As described above, in the vehicle seat 10 according to the present embodiment shown in FIGS. 1 to 3, when a tensile load F is applied to the belt anchor bolt 56, the engagement portion 15L between the upper rail 16 and the lower rail 14, 15R (see FIG. 2) can achieve good balance in load sharing. In other words, it is possible to prevent the load (separation load) that attempts to separate the upper rail 16 from the lower rail 14 from concentrating on the outside in the seat width direction. As a result, it becomes possible to suppress an increase in the size of the cross section of the slide rail 12 perpendicular to the longitudinal direction, and it becomes possible to suppress an increase in the weight of the slide rail 12.

(Supplementary explanation of embodiment)
As a modification of the above embodiment, the rail joint wall (50A) is joined to the upper wall (16A) of the upper rail (16) in a region (50F) on the seat front side than the bolt corresponding region (50X). It is also possible to adopt a configuration in which the portion is joined by welding only to a portion of the upper wall portion (16A) of the upper rail (16) that is offset toward the inner end portion (16A1) in the seat width direction.

In addition, as a modification of the above embodiment, the rail joint wall (50A) is joined to the upper wall (16A) of the upper rail (16) at the bolt corresponding area (50X) and the area (50Z) on the rear side of the seat. The part to be joined is a part of the upper wall part (16A) of the upper rail (16) that is offset toward the inner end (16A1) in the seat width direction and is other than the inner end (16A1) in the seat width direction by welding. A configuration in which they are joined may also be adopted.

In addition, as a modification of the above embodiment, instead of welding at the welding parts 62 and 64 in the above embodiment, an area (50F) of the rail joint wall (50A) on the seat front side than the bolt corresponding area (50X) ) may be joined to the widthwise central portion of the upper wall portion (16A) of the upper rail (16) by bolt fastening.

Note that the embodiment described above and the plurality of modified examples described above can be implemented in combination as appropriate.

Although one example of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented with various modifications other than the above without departing from the spirit thereof. .

10 Vehicle seat 14 Lower rail 16 Upper rail 16A Upper wall portion 16A1 Inner end in seat width direction 18 Vehicle floor 40 Seat belt 42 Tongue plate 44 Buckle device 50 Belt anchor bracket (bracket)
50A Rail joint wall part 50B Outer vertical wall part (vertical wall part)
50F Area of the rail joint wall part on the seat front side than the bolt compatible area 50X Bolt compatible area 50Z Area of the rail joint wall part on the seat rear side of the bolt compatible area 52 Part to be joined 56 Belt anchor bolt

Claims (3)

A lower rail fixed to the vehicle floor,
an upper rail that is slidably engaged with the lower rail in a seat longitudinal direction;
a buckle device with which a tongue plate provided on the seat belt is engaged;
A rail joint wall joined to the upper surface side of the upper wall of the upper rail and the buckle device extending upward from an outer end in the seat width direction of the rail joint wall are connected by a belt anchor bolt. a bracket having a vertical wall portion;
Equipped with
A bolt corresponding area disposed at the same position in the seat longitudinal direction as the belt anchor bolt in the rail joint wall part and a joined part to be joined to the upper wall part of the upper rail in a region on the rear side of the seat are connected to the upper rail. A vehicle seat that is joined by welding only to a portion of the upper wall that is offset toward the inner end in the seat width direction. The vehicle seat according to claim 1, wherein the joined portion is joined by welding only to an inner end in the seat width direction of the upper wall portion of the upper rail. The vehicle seat according to claim 1 or 2, wherein a region of the rail joint wall portion that is closer to the front of the seat than the bolt corresponding region is joined to a widthwise central portion of the upper wall portion of the upper rail. .