JP2016037119A - Vehicle rail attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle rail attachment structure which can suppress that foreign matters remain in a lower rail.SOLUTION: A vehicle rail attachment structure has a structure in which a lower rail is attached to a vehicle floor via a bracket. The lower rail and the bracket are connected to each other with fastening bolts 40, and bolt heads 42 of the fastening bolts 40 are arranged so that an angle which is formed of long axis directions of the bolts and a longitudinal direction DA of the lower rail 10 is set within an attachment error range. Contour lines of the bolt heads 42 are formed so as to approximate a long axis LL as progressing toward a second point from a first point in a zone reaching the second point which intersects with the long axis LL from the first point which intersects with a short axis LS. The bolt heads 42 are formed so that occupation widths of the bolt heads in a second arrangement becomes smaller than or equal to occupation widths of the bolt heads 42 in a first arrangement in a relationship between the first arrangement and the second arrangement when the bolt heads 42 are rotated up to a maximum angle within the attachment error range from the first arrangement.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a mounting structure for a vehicle rail installed on a vehicle floor.

  The vehicle seat is fixed to the vehicle floor via a slide device constituted by an upper rail and a lower rail. The upper rail is attached to the seat cushion. The lower rail is attached to the vehicle floor via a bracket.

  As a lower rail (vehicle rail) mounting structure, for example, a technique described in Patent Document 1 is known. In this technique, the lower end of the bracket is fastened to the vehicle floor with a bolt, and the upper end of the bracket is connected to the lower rail with a bolt. A bolt head of a bolt that fastens the upper end portion of the bracket and the lower rail is disposed in the lower rail.

JP 2001-260726 A

  By the way, foreign matter may enter the lower rail. When the foreign matter is small, the upper rail moves away from the lower rail, but when the foreign matter is large, the foreign matter may be caught between the bolt head of the fastening bolt and the end of the upper rail. In this case, the movement range of the upper rail is limited.

  This invention is made | formed in view of such a situation, The objective is to provide the attachment structure of the rail for vehicles which can suppress that a foreign material remains in a lower rail.

  (1) A vehicle rail mounting structure that solves the above problems includes a lower rail that is mounted on a vehicle floor via a bracket, and an upper rail that is slidably disposed with respect to the lower rail, and the lower rail and the bracket. Are connected to each other by a fastening bolt, and the bolt head of the fastening bolt has a short axis and a long axis, and an angle formed by the long axis direction of the bolt head and the longitudinal direction of the lower rail is within an attachment error range. The outline of the bolt head of the fastening bolt is arranged from the first point to the second point that intersects the major axis to the second point that intersects the major axis. The bolt head is formed so as to approach the long axis toward the second point, and the bolt head has a long axis along the reference line. In the relationship between the arrangement and the second arrangement when rotated from the first arrangement to the maximum angle of the attachment error range, the occupied width of the bolt head in the direction perpendicular to the reference line in the second arrangement is The bolt head is formed so as to be smaller or equal to the occupied width of the bolt head in the direction perpendicular to the reference line in the first arrangement. The reference line means an arbitrary line for convenience for explaining the relationship between the first arrangement and the second arrangement.

  According to the above configuration, the occupied width of the bolt head in the lower rail is equal to or less than the predetermined width. As a result, the separation distance between the bolt head and the outer wall of the lower rail becomes larger than the predetermined distance, so that foreign matter is easily discharged. For this reason, it is suppressed that a foreign material remains in the lower rail.

  (2) In the vehicle rail mounting structure described above, the lower rail has a bottom wall and a pair of outer walls extending in the longitudinal direction so as to protrude from both ends of the bottom wall, and the upper rail is An upper wall, a pair of insertion walls provided so as to protrude from both ends of the upper wall and inserted into the lower rail, and a pair of slides extending from each of the insertion walls and facing the outer wall of the lower rail A short axis length of the bolt head is shorter than a dimension between the pair of insertion walls of the upper rail, the bolt head is disposed between the pair of insertion walls of the upper rail, and A lower end portion of the upper rail is disposed closer to a bottom wall side of the lower rail than an upper surface of the bolt head.

  According to this configuration, the bolt head is not disposed between the pair of insertion walls of the upper rail, and for this reason, the slide device in which the lower end of the upper rail is disposed farther from the bottom wall of the lower rail than the upper surface position of the bolt head. In comparison, the height of the slide device can be reduced.

  (3) In the vehicle rail mounting structure, a welding projection is provided on a bottom surface of the bolt head, the bolt head is welded to the lower rail via the welding projection, and the bolt head is At least a part of the outline has a straight line portion extending straight in the minor axis direction.

  According to this configuration, it is possible to accurately determine the direction of the bolt head relative to the lower rail by pressing the jig against the straight portion of the bolt head. For this reason, it is easy to position the fastening bolt so that the direction of the bolt head with respect to the lower rail is an angle within an attachment error range.

(4) In the vehicle rail mounting structure, the bolt head has a side surface extending perpendicularly or at a set angle with respect to a bottom surface of the bolt head in the linear portion.
According to this configuration, the jig can be pressed against the side surface of the straight portion of the bolt head in a stable state.

  (5) In the vehicle rail mounting structure, at least two of the welding protrusions are provided on the bottom surface of the bolt head, and are disposed along the major axis and on the opposite sides of the screw portion. According to this configuration, the fastening bolt is firmly fixed to the lower rail.

  (6) In the vehicle rail mounting structure described above, the bolt head has a tapered surface inclined along the long axis. According to this configuration, the foreign matter that has entered the lower rail can easily get over the bolt head. For this reason, it is suppressed that a foreign material remains in the lower rail.

  (7) In the vehicle rail mounting structure, the bolt head has a pair of first and fourth sides that are parallel to the short axis and disposed on opposite sides of the center. A pair of second and fifth sides that are inclined with respect to the major axis and opposite to each other with respect to the center and parallel to each other, and the second and fifth sides and the major axis. It has a pair of 3rd side and 6th side arrange | positioned with respect to a line symmetrical position.

  According to this configuration, since the bolt head has a line symmetrical structure with respect to the major axis, it is easy to visually match the longitudinal direction of the lower rail with the major axis of the bolt head. From such a thing, the attachment workability | operativity at the time of fixing a fastening bolt to a lower rail improves.

  The vehicle rail mounting structure described above can suppress foreign matter remaining in the lower rail.

The schematic diagram of a vehicle seat. The perspective view of a slide apparatus. Sectional drawing which follows the AA line of FIG. (A) is a top view of a fastening bolt, (b) is a bottom view of a fastening bolt. (A) is a side view of the fastening bolt viewed from the arrow B of FIG. 4, and (b) is a side view of the fastening bolt viewed from the arrow C of FIG. 4. (A) is a figure which shows 1st arrangement | positioning of a bolt head, (b) is a figure which shows 2nd arrangement | positioning of a bolt head. Sectional drawing which follows the DD line | wire of FIG. (A) The figure which shows the residual aspect of a foreign material about the attachment structure of the rail for vehicles concerning a 1st reference example, (b) The figure which shows the residual aspect of a foreign substance about the attachment structure of the rail for vehicles concerning a 2nd reference example, (C) The figure which shows the discharge | emission aspect of a foreign material about the attachment structure of the rail for vehicles which concerns on embodiment.

With reference to FIGS. 1-8, the mounting structure of the rail for vehicles is demonstrated.
FIG. 1 shows a vehicle seat attached to a vehicle floor 1.
A vehicle seat (hereinafter referred to as “seat 2”) includes a seat cushion 3 constituting a seating surface and a seat back 4 constituting a backrest. The seat 2 is attached to the vehicle floor 1 via two slide devices 5. Each of the slide devices 5 is disposed on both ends of the seat 2 so as to be parallel to each other and along the front-rear direction of the vehicle.

FIG. 2 is a perspective view of the slide device 5.
The slide device 5 includes a lower rail 10 that is fixed to the vehicle floor 1 via a bracket 30 and an upper rail 20 that is slidably disposed on the lower rail 10. The upper rail 20 is attached to the bottom of the seat cushion 3 via the attachment member 6. These rails (lower rail 10 and upper rail 20) are formed of a metal plate.

A sliding contact structure between the lower rail 10 and the upper rail 20 will be described with reference to FIG.
The lower rail 10 is inward from the bottom wall 11, a pair of outer walls 12 extending in a substantially vertical direction from both sides in the width direction of the bottom wall 11, and ends of the outer walls 12 (ends opposite to the bottom wall 11). And the inner wall 14 extending from the bent portion 13 and extending toward the bottom wall 11.

  The upper rail 20 includes an upper wall 21, a pair of insertion walls 22 extending substantially vertically from both sides in the width direction of the upper wall 21 and passing through the lower rail 10, and ends of the insertion walls 22 (ends opposite to the upper wall 21. And a sliding wall 24 extending from the lower end 23 and facing the outer wall 12 of the lower rail 10.

  The sliding wall 24 extends from the lower end 23 outward and toward the upper wall 21, and from the end of the first bent portion 25 toward the insertion wall 22 and toward the upper wall 21. And a second bent portion 26 extending.

  The pair of insertion walls 22 of the upper rail 20 are inserted between the pair of inner side walls 14 of the lower rail 10. One insertion wall 22 is inserted into one inner wall 14 and the other insertion wall 22 is inserted into the other inner wall 14. It arrange | positions so that it may oppose.

  The first bent portion 25 and the second bent portion 26 of the upper rail 20 are disposed between the outer wall 12 and the inner wall 14 of the lower rail 10. Between the first bent portion 25 of the upper rail 20 and the outer wall 12 (bottom wall 11 side) of the lower rail 10, and between the second bent portion 26 of the upper rail 20 and the outer wall 12 (folded portion 13 side) of the lower rail 10. A rolling member 28 is disposed therebetween. With such a structure, the upper rail 20 can slide with respect to the lower rail 10.

  A bolt head 42 of the fastening bolt 40 is disposed between the pair of insertion walls 22 of the upper rail 20. Then, the upper rail 20 is disposed with respect to the lower rail 10 so that the lower end portion 23 of the upper rail 20 is positioned on the bottom wall 11 side of the lower rail 10 with respect to the upper surface 47 of the bolt head 42.

Next, a structure for fixing the lower rail 10 to the vehicle floor 1 will be described.
As shown in FIG. 2, the lower rail 10 is fixed to the vehicle floor 1 with two brackets 30. The bracket 30 has a lower end portion 31 in which a through hole 33 is formed and an upper end portion 32 in which a through hole 34 (see FIG. 3) is formed.

The lower end portion 31 of the bracket 30 is fastened to the vehicle floor 1 by fastening bolts (not shown) inserted through the through holes 33.
The upper end portion 32 of the bracket 30 is fastened to the bottom wall 11 of the lower rail 10 by fastening bolts 40 inserted through the through holes 34. Specifically, as shown below, the bracket 30 and the lower rail 10 are fastened. The bottom wall 11 of the lower rail 10 is provided with a through hole 15 (see FIG. 3) through which the fastening bolt 40 is inserted. The through hole 15 is formed in the intermediate portion in the width direction of the lower rail 10. The fastening bolt 40 is inserted into the through hole 15. The fastening bolt 40 and the bottom wall 11 of the lower rail 10 are fixed by projection welding. The fastening bolt 40 is inserted through the through hole 34 in the upper end portion 32 of the bracket 30, and the nut 50 is fastened from the back side of the bracket 30. In this way, the lower rail 10 and the bracket 30 are fastened.

The structure of the fastening bolt 40 that fastens the bracket 30 and the lower rail 10 will be described with reference to FIGS.
About the fastening bolt 40, a top view is shown to Fig.4 (a), and a bottom view is shown to FIG.4 (b). The side view is shown in FIG. 5 (a) and FIG. 5 (b). FIG. 6A shows a first arrangement of the bolt head 42, and FIG. 6B shows a second arrangement of the bolt head 42. FIG. 7 is a cross-sectional view taken along the line DD of FIG. FIG. 7 shows the direction of the fastening bolt 40.

The fastening bolt 40 includes a screw portion 41 and a bolt head 42.
As shown in FIG. 4, the bolt head 42 has a planar structure in which the vertical width and the horizontal width are different in a plan view. That is, the bolt head 42 has a short axis LS and a long axis LL.

  The short axis length DLS (the length along the short axis LS) of the bolt head 42 is set so that the bolt head 42 of the fastening bolt 40 can be disposed between the pair of insertion walls 22 of the upper rail 20 as described above. The length is set to be shorter than the dimension between the pair of insertion walls 22 (referred to as “the dimension LD between the insertion walls”). The major axis length DLL (length along the major axis LL) of the bolt head 42 is set to be longer than the dimension LD between the insertion walls of the upper rail 20. This is due to the following reason. In order to ensure the strength, the diameter of the threaded portion 41 is set to be slightly smaller than the dimension LD between the insertion walls of the upper rail 20. For this reason, there is no dimensional allowance in the minor axis direction of the bolt head 42, and a welding projection 48 described later is provided along the major axis direction. For this reason, the long axis length DLL of the bolt head 42 is longer than the dimension LD between the insertion walls of the upper rail 20.

  The outline LV of the bolt head 42 has a first point in at least a part of a section from the first point PA where the outline LV and the short axis LS intersect to the second point PB where the outline LV and the long axis LL intersect. As it goes from PA to the second point PB, it approaches the long axis LL side.

  Further, the outline LV of the bolt head 42 includes a straight portion (that is, a linear element parallel to the short axis LS) in the short axis direction. This is because, if there is such a straight portion, the direction of the bolt head 42 can be accurately determined by a jig.

For example, as shown in FIG. 4, the bolt head 42 is formed in a hexagonal shape in plan view. The outline LV of the bolt head 42 is composed of first to sixth sides 42a to 42f.
Each of the first side 42a and the fourth side 42d is parallel to the short axis LS and is disposed on the opposite side with respect to the central portion. The first side 42a and the fourth side 42d correspond to the above-described straight line portion.

Each of the second side 42b and the fifth side 42e is an oblique straight line that approaches the long axis LL as the distance from the short axis LS increases, and is disposed on the opposite side of the central portion and in parallel with each other.
Each of the third side 42c and the sixth side 42f is an oblique straight line that approaches the long axis LL as the distance from the short axis LS increases, and is disposed on the opposite side of the central portion and in parallel with each other. Furthermore, the third side 42c and the sixth side 42f are formed in line symmetry with respect to the second side 42b and the fifth side 42e, respectively, with the long axis LL as the axis of symmetry.

  As shown in FIG. 4A and FIG. 5A, the bolt head 42 includes a tapered surface 44 that is inclined from the first side 42a toward the center, and a fourth side 42d toward the center. An inclined taper surface 45 is provided.

  As shown in FIG. 5B, the bolt head 42 has side surfaces 46 extending at a vertical angle or a set angle with respect to the bottom surface 43 of the bolt head 42 in each of the first side 42 a to the sixth side 42 f. The set angle is set to a value close to 90 degrees, for example.

As shown in FIGS. 4B and 5A, the bottom surface 43 of the bolt head 42 is provided with a welding projection 48 that projects from the bottom surface 43.
The welding projections 48 are provided at two locations along the long axis LL and opposite to the screw portion 41.

The outline LV of the bolt head 42 will be described with reference to FIGS. 6 (a) and 6 (b).
The bolt head 42 preferably satisfies the following conditions. That is, the outline LV of the bolt head 42 may be formed such that the occupied width WS of the bolt head 42 in the second arrangement is smaller or equal to the occupied width WS of the bolt head 42 in the first arrangement. preferable.

  As shown in FIG. 6A, the first arrangement indicates an arrangement in which the long axis LL of the bolt head 42 is set along the reference line LX. The reference line LX is a line for convenience for regulating the relationship between the first arrangement and the second arrangement shown below.

  As shown in FIG. 6B, the second arrangement indicates an arrangement when the bolt head 42 is rotated from the first arrangement to the maximum angle θmax within the attachment error range. The attachment error range indicates a preset angle range. The attachment error range is set based on the variation in the arrangement angle of the bolt head 42 that may occur when the fastening bolt 40 is fixed to the lower rail 10. For example, the attachment error range is set to “± A degrees”. “A” indicates the maximum angle θmax.

The occupied width WS indicates the width in a direction perpendicular to the reference line LX with respect to the bolt head 42 placed in the first arrangement or the second arrangement.
According to the external structure of the bolt head 42 that satisfies the above conditions, if the fastening bolt 40 is attached to the lower rail 10 so that the bolt head 42 is arranged at an angle within the attachment error range, the bolt in the width direction DB of the lower rail 10 The width occupied by the head 42 (occupied width WS) is equal to or less than a predetermined width (see FIG. 7). As shown in FIG. 4, when the outer shape of the bolt head 42 is a hexagon, the width occupied by the bolt head 42 in the width direction DB of the lower rail 10 (occupied width WS) is a length equal to or less than the short axis length DLS of the bolt head 42. It will be. In the following description, such an external structure of the bolt head 42 is referred to as a “constant occupied width structure”.

The arrangement structure of the fastening bolt 40 will be described with reference to FIG.
The fastening bolt 40 is disposed such that the angle formed by the major axis direction of the bolt head 42 and the longitudinal direction DA of the lower rail 10 is within an attachment error range (for example, “± A degrees”).

  According to this arrangement, coupled with the above-described structure of the bolt head 42 having a constant occupation width, the occupation width WS of the bolt head 42 in the width direction DB of the lower rail 10 is set to a predetermined width (specifically, the short axis length DLS). ) It becomes the following length. That is, the separation distance LA between the bolt head 42 and the outer wall 12 of the lower rail 10 is larger than the predetermined distance.

With reference to FIG. 8, the operation of the mounting structure of the vehicle rail will be described in comparison with the reference example.
FIG. 8A shows a vehicle rail mounting structure according to a first reference example. In this vehicle rail mounting structure, the lower rail 10 and the bracket 30 are fastened by a fastening bolt 140 having a circular bolt head 142. The diameter of the bolt head 142 is equal to the long axis length DLL (see FIG. 7) of the bolt head 42 according to the present embodiment, and is longer than the dimension LD between the insertion walls of the upper rail 20. This is because the welding projection 48 is disposed on the bolt head 142. It is assumed that the bolt head 142 is welded to the lower rail 10 at two locations. In this case, the fastening strength between the lower rail 10 and the bracket 30 is substantially equal to the fastening strength of the bolt head 42 according to the present embodiment. However, the following problems arise.

  In this vehicle rail mounting structure, as shown in FIG. 8A, a part of the bolt head 142 is a locus of the upper rail guide portion 27 (a portion including the insertion wall 22, the lower end portion 23, and the sliding wall 24). It enters the area AR.

  Therefore, if the foreign object 100 having a width and length substantially equal to the distance LB between the outer wall 12 of the lower rail 10 and the insertion wall 22 of the upper rail 20 enters the lower rail 10, the foreign object 100 moves along with the movement of the upper rail 20. Then, it is carried to the outside of the lower rail 10, but comes into contact with the bolt head 142 when it is carried to the end of the lower rail 10. The foreign object 100 may be discharged beyond the bolt head 142 due to the movement of the lower rail 10, but the foreign object 100 may not be discharged due to the foreign object 100 being sandwiched between the lower rail 10 and the bolt head 142. is there.

  FIG. 8B shows a vehicle rail mounting structure according to a second reference example. In this vehicle rail mounting structure, the lower rail 10 and the bracket 30 are fastened by a fastening bolt 240 having a rectangular bolt head 242. The long side of the bolt head 242 is equal to the long axis length DLL (see FIG. 7) of the bolt head 42 according to the present embodiment, and the short side of the bolt head 242 is the short axis length DLS of the bolt head 42 according to the present embodiment. (See FIG. 7). That is, when the fastening bolt 240 is arranged so that the long axis LL of the bolt head 242 and the longitudinal direction DA of the lower rail 10 are aligned, the bolt head 242 does not enter the locus area AR of the upper rail guide portion 27. It is configured. The bolt head 242 is welded to the lower rail 10 at two locations. In this case, the fastening strength between the lower rail 10 and the bracket 30 is substantially equal to the fastening strength of the bolt head 42 according to the present embodiment. However, the following problems arise.

  When the fastening bolt 240 is attached to the lower rail 10 so that the angle of the bolt head 242 becomes the maximum angle θmax of the attachment error range, the bolt head 242 in the width direction of the lower rail 10 compared to the case where the attachment error is 0 degree. Occupied width WS increases. For this reason, a part of the bolt head 242 may enter the locus area AR of the upper rail guide portion 27. In particular, when the short side of the bolt head 242 is substantially equal to the dimension LD between the insertion walls of the upper rail 20, there is a high possibility that a part of the bolt head 242 enters the locus area AR of the upper rail guide portion 27.

  Therefore, if the foreign object 100 having a width and length substantially equal to the distance LB between the outer wall 12 of the lower rail 10 and the insertion wall 22 of the upper rail 20 enters the lower rail 10, the foreign object 100 moves to the upper rail 20. Along with this, it is carried outside the lower rail 10, but comes into contact with the bolt head 242 when it is carried to the end of the lower rail 10. For this reason, the foreign object 100 may not be discharged because the foreign object 100 is sandwiched between the lower rail 10 and the bolt head 242.

FIG. 8C shows a vehicle rail mounting structure according to this embodiment.
Since the bolt head 42 is welded to the lower rail 10 at two locations, the fastening strength between the lower rail 10 and the bracket 30 is substantially equal to the fastening strength of the bolt head 42 according to the above two reference examples.

  In the vehicle rail mounting structure according to this embodiment, since the bolt head 42 has a constant occupation width structure, the fastening bolt 40 is mounted on the lower rail 10 so that the angle of the bolt head 42 is the maximum angle θmax of the mounting error range. Even if this is done, the bolt head 42 is located outside the locus area AR of the upper rail guide portion 27 as shown in FIG. That is, there is no obstacle in the trajectory area AR of the upper rail guide portion 27 that obstructs the movement of the foreign object 100.

  Therefore, similarly to the reference example, even if a foreign object 100 having a width and length substantially equal to the distance LB between the outer wall 12 of the lower rail 10 and the insertion wall 22 of the upper rail 20 enters the lower rail 10, The foreign object 100 is discharged with the movement of 10.

As described above, the vehicle rail mounting structure according to this embodiment has the following effects.
(1) In the vehicle rail mounting structure, the bolt head 42 has the following configuration.

  The outline LV of the bolt head 42 is directed from the first point PA to the second point PB in at least a part of the section from the first point PA intersecting with the short axis LS to the second point PB intersecting with the long axis LL. It is formed so as to approach the long axis LL side. Further, the bolt head 42 has a relationship between the first arrangement in which the major axis LL of the bolt head 42 is along the reference line LX and the second arrangement when the bolt head 42 is rotated from the first arrangement to the maximum angle θmax of the attachment error range. It is structured as follows. That is, the occupied width WS of the bolt head 42 in the direction perpendicular to the reference line LX in the second arrangement is smaller than or equal to the occupied width WS of the bolt head 42 in the direction perpendicular to the reference line LX in the first arrangement. Thus, the bolt head 42 is formed. That is, the bolt head 42 has a “constant occupation width structure”.

  The bolt head 42 of the fastening bolt 40 is disposed with respect to the lower rail 10 so that the angle (angle) formed by the major axis direction and the longitudinal direction DA of the lower rail 10 is within the attachment error range.

  According to this configuration, the occupied width WS of the bolt head 42 in the lower rail 10 is equal to or less than a predetermined width. Thereby, since the separation distance LA between the bolt head 42 and the outer wall 12 of the lower rail 10 becomes larger than the predetermined distance, the foreign matter 100 is easily discharged.

  (2) In the above embodiment, the lower rail 10 includes the bottom wall 11 and a pair of outer walls 12 provided so as to protrude from both ends of the bottom wall 11 and extending in the longitudinal direction DA. The upper rail 20 includes an upper wall 21, a pair of insertion walls 22 inserted through the lower rail 10, and a pair of sliding walls 24 extending from each of the insertion walls 22 and facing the outer wall 12 of the lower rail 10. The short axis length DLS of the bolt head 42 is set to be shorter than the dimension between the pair of insertion walls 22 of the upper rail 20 (the dimension LD between the insertion walls), and the bolt is interposed between the pair of insertion walls 22 of the upper rail 20. The head 42 is disposed, and the lower end portion 23 of the upper rail 20 is disposed closer to the bottom wall 11 side of the lower rail 10 than the upper surface 47 of the bolt head 42.

  According to this configuration, the bolt head 42 is not disposed between the pair of insertion walls 22 of the upper rail 20, so that the lower end portion 23 of the upper rail 20 extends from the bottom wall 11 of the lower rail 10 from the position of the upper surface 47 of the bolt head 42. However, the height of the slide device 5 can be made lower than that of the slide device 5 disposed far away.

  (3) In the above embodiment, the bolt head 42 is welded to the lower rail 10 via the welding projections 48 provided on the bottom surface 43. The bolt head 42 preferably has straight portions (first side 42a, fourth side 42d) that extend linearly in the minor axis direction in at least a part of the outline LV.

  According to this configuration, it is possible to accurately determine the direction of the bolt head 42 with respect to the lower rail 10 by pressing the jig against the straight portion of the bolt head 42. For this reason, it becomes easy to position the fastening bolt 40 so that the direction of the bolt head 42 with respect to the lower rail 10 becomes an angle within the attachment error range.

  (4) In the above-described embodiment, the bolt head 42 has the side surface 46 that extends perpendicularly or at a set angle with respect to the bottom surface 43 of the bolt head 42 at the straight portion (first side 42a, fourth side 42d).

  According to this configuration, the jig can be pressed against the side surface 46 of the straight portion of the bolt head 42 in a stable state. Thereby, positioning of the fastening bolt 40 with respect to the lower rail 10 becomes easy.

  (5) In the above-described embodiment, at least two welding projections 48 are provided on the bottom surface 43 of the bolt head 42, and are disposed on the opposite sides of the screw portion 41 along the long axis LL. According to this configuration, the fastening bolt 40 is firmly fixed to the lower rail 10.

(6) In the above embodiment, the bolt head 42 has the tapered surface 44 that is inclined along the long axis LL.
According to this configuration, the foreign object 100 entering the lower rail 10 can easily get over the bolt head 42. For this reason, it is suppressed that the foreign material 100 remains in the lower rail 10.

  As shown in FIG. 5A, the tapered surface 44 is preferably formed so as to incline toward the center from both ends of the bolt head 42 in the major axis direction. When the tapered surface 44 is formed only on one side in the long axis direction, the bolt head 42 needs to be disposed so that the tapered surface 44 is disposed on the inner side in the longitudinal direction DA of the lower rail 10. According to the configuration, it is not necessary to consider the direction of the bolt head 42. For this reason, the mounting workability of the fastening bolt 40 is improved.

(7) In the above embodiment, the outline LV of the bolt head 42 is formed in a hexagon having the following six sides.
Specifically, the first side 42a and the fourth side 42d are parallel to the short axis LS and are disposed on opposite sides with respect to the center portion.

The second side 42b and the fifth side 42e are inclined with respect to the long axis LL and are arranged in parallel to each other on opposite sides of the central portion.
The third side 42c and the sixth side 42f are arranged at positions symmetrical with respect to the second side 42b and the fifth side 42e and the long axis LL.

  According to this configuration, since the bolt head 42 has a line symmetrical structure with respect to the long axis LL, the longitudinal direction DA of the lower rail 10 and the long axis LL of the bolt head 42 can be easily aligned with each other by visual inspection. For this reason, the mounting workability when the fastening bolt 40 is fixed to the lower rail 10 is improved.

In addition, the said embodiment can be changed as follows.
In the above embodiment, an example of the bolt head 42 having a hexagonal outer shape in plan view is given, but the outer shape of the bolt head 42 is not limited to this. For example, the external structure of the bolt head 42 can be set to a rhombus, an octagon, an ellipse, or the like. Alternatively, the outline LV of the bolt head 42 can be constituted by a straight line and a curve. As described above, it is preferable that the outline LV of the bolt head 42 includes a straight portion parallel to the short axis LS.

  In the above embodiment, the two welding projections 48 are provided on the bottom surface 43 of the bolt head 42, but the number of the welding projections 48 may be two or more. For example, welding protrusions 48 can be provided at four locations on the bottom surface 43 of the bolt head 42.

  In the above embodiment, the technology related to the external structure of the bolt head 42 is applied to a vehicle rail mounting structure in which the fastening bolt 40 is welded to the lower rail 10. It can be applied regardless. That is, the present technology is also applied to the fastening bolt 40 that is not welded.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle floor, 2 ... Seat, 3 ... Seat cushion, 4 ... Seat back, 5 ... Slide apparatus, 6 ... Mounting member, 10 ... Lower rail, 11 ... Bottom wall, 12 ... Outer wall, 13 ... Bending part, 14 ... inner wall, 15 ... through hole, 20 ... upper rail, 21 ... upper wall, 22 ... insertion wall, 23 ... lower end, 24 ... sliding wall, 25 ... first bent portion, 26 ... second bent portion, 27 ... Upper rail guide part, 28 ... rolling member, 30 ... bracket, 31 ... lower end part, 32 ... upper end part, 33 ... through hole, 34 ... through hole, 40 ... fastening bolt, 41 ... screw part, 42 ... bolt head, 42a ... 1st side, 42b ... 2nd side, 42c ... 3rd side, 42d ... 4th side, 42e ... 5th side, 42f ... 6th side, 43 ... Bottom surface, 44 ... Tapered surface, 45 ... Tapered surface, 46 ... side surface, 47 ... upper surface, 48 ... welding projection, 50 ... nut, 10 ... foreign matter, 140 ... fastening bolts, 142 ... bolt head, 240 ... fastening bolts, 242 ... bolt head.

Claims (7)

A lower rail attached to the vehicle floor via a bracket, and an upper rail slidably disposed with respect to the lower rail,
The lower rail and the bracket are connected to each other by a fastening bolt,
The bolt head of the fastening bolt has a short axis and a long axis, and is arranged such that an angle formed by the long axis direction of the bolt head and the long direction of the lower rail is within an attachment error range.
The outline of the bolt head of the fastening bolt is directed from the first point to the second point in at least a part of a section from the first point that intersects the minor axis to the second point that intersects the major axis. And is formed to approach the long axis as
And the bolt head is in a relationship between a first arrangement in which the major axis of the bolt head is along a reference line and a second arrangement when the bolt head is rotated from the first arrangement to the maximum angle of the attachment error range, The occupied width of the bolt head in the direction perpendicular to the reference line in the second arrangement is smaller or equal to the occupied width of the bolt head in the direction perpendicular to the reference line in the first arrangement. Formed rail mounting structure for vehicles. The lower rail has a bottom wall and a pair of outer walls provided to protrude from both ends of the bottom wall and extending in the longitudinal direction,
The upper rail is provided to protrude from both ends of the upper wall, the pair of insertion walls that pass through the lower rail, and extends from each of the insertion walls to face the outer wall of the lower rail. A pair of sliding walls;
The short axis length of the bolt head is shorter than the dimension between the pair of insertion walls of the upper rail, the bolt head is disposed between the pair of insertion walls of the upper rail, and the lower end portion of the upper rail is The vehicle rail mounting structure according to claim 1, wherein the vehicle rail mounting structure is disposed closer to a bottom wall of the lower rail than an upper surface of the bolt head. A welding projection is provided on the bottom surface of the bolt head,
The bolt head is welded to the lower rail via the welding projection,
3. The vehicle rail mounting structure according to claim 1, wherein the bolt head has a straight portion that extends linearly in the minor axis direction in at least a part of the outline. 4. The vehicle rail mounting structure according to claim 3, wherein the bolt head has a side surface extending perpendicularly or at a set angle with respect to a bottom surface of the bolt head in the linear portion. 5. The vehicle rail according to claim 3, wherein at least two of the welding protrusions are provided on a bottom surface of the bolt head, and are disposed on the opposite sides of the screw portion along the long axis. Mounting structure. The rail mounting structure for a vehicle according to any one of claims 1 to 5, wherein the bolt head has a tapered surface inclined along the long axis. The outline of the bolt head has a pair of first and fourth sides that are parallel to the minor axis and opposite to each other with respect to the central portion, and is inclined with respect to the major axis and the central portion. A pair of second and fifth sides arranged opposite to each other and parallel to each other, and a pair of two sides arranged in line-symmetrical positions with respect to the second and fifth sides and the major axis The vehicle rail mounting structure according to claim 1, further comprising a third side and a sixth side.