JP2001001804A - Leg bracket mounting structure in seat slide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide strong separation strength, to enhance positional precision as a stopper when used as the stopper for a roller, and to reduce the number of part items to easily conduct assembling work and manufacturing work. SOLUTION: Plural through-holes 6 are drilled in an overlapped part with a lower rail 1 and a leg bracket 3, plural leg pieces 12 projected unidirectionally each other from a connecting part 11 brought into contact with one outer face of the overlapped part in a fastening member 10 are engaged, and tip parts of the respective leg pieces 12 projected from the other outer face of the overlapped part are deformed plastically to be expanded sidewards.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for mounting a leg bracket to a lower rail of a vehicle seat slide device.

[0002]

2. Description of the Related Art For example, as shown in FIG. 4, a seat slide device for a vehicle such as an automobile slidably fits an upper rail (2) facing forward and backward with a lower rail (1) facing forward and backward. Then, the lower rail (1) is connected to the vehicle floor via leg brackets (3) attached to the front and rear ends thereof.
(Not shown) etc. and upper rail (2)
The seat (4), especially its seat, is fixed to the lower rail.
Locking means provided between (1) and upper rail (2)
According to (5), the upper rail (2) and the seat (4) can be locked at a desired position with respect to the lower rail (1), or the locked state can be released.

As a conventional mounting structure for mounting the leg bracket (3) on the front and rear ends of the lower rail (1), for example, as shown in FIGS. 5 to 7, a leg bracket (3) is provided on the lower surface of the lower rail (1). One end of 3) is closely contacted, and a pair of front and rear through-holes (6) are formed in the overlapped portion thereof, and each through-hole (6)
And a rivet (7) having an enlarged head (7a) is fitted so that the enlarged head (7a) is at the lower end, and
Generally, the upper end protruding toward the (1) side is plastically deformed so as to expand the diameter, that is, caulking is performed to form a caulking portion (7b) having a substantially conical shape.

[0004]

However, in the conventional leg bracket mounting structure as described above, the lower rail
The peel strength between (1) and the leg bracket (3) is not sufficient. In particular, in recent years, seat belts have been
(2), and in such a case, a strong tensile load applied to the seat belt is applied to the lower rail (1) through the upper rail (2), particularly to the rear end. The lower rail (1) and the leg bracket (3)
A high peel strength is required for the joint with (3).

The caulking portion (7b) of the one conventional rivet (7) includes a lower rail (1) and an upper rail (2).
May be used as a stopper for the roller (8) (see FIG. 7) disposed to smooth their movement in the front-rear direction. Dimensions vary, making it difficult to maintain positional accuracy as a stopper. In order to maintain the positional accuracy as such a stopper, it is preferable to use the rivet (7) as a stopper for the roller (8) with the enlarged diameter head (7a) of the rivet (7) as the upper part. Most of the cross-sectional shapes are
As shown in FIGS. 6 and 7, since the width of the opening (1a) at the center of the upper end is substantially C-shaped upward, the diameter of the rivet (7) is increased from this opening (1a). 7a) cannot be passed in many cases, and therefore, at present, the structure shown in FIG. 5 is forced.

Further, in the conventional structure as described above, a large number of rivets (7) are required, the number of parts is increased, and a caulking operation must be performed for each rivet (7). Production work is complicated.

[0007] In view of the above-mentioned problems of the prior art, the present invention provides a large peel strength,
When used as a stopper for a roller, the position accuracy as the stopper can be increased, the number of parts can be reduced, and the leg bracket in the seat slide device can be easily assembled and manufactured. An object of the present invention is to provide a mounting structure.

[0008]

According to the present invention, the above-mentioned problem is solved as follows. (1) A leg bracket mounting structure for a seat slide device for mounting a leg bracket for mounting the lower rail to a vehicle floor or the like on a front-rearward lower rail that slidably supports an upper rail fixed to a seat. A plurality of through-holes are drilled in the overlapping portion between the lower rail and the leg bracket, and in each through-hole, in the same direction as a connecting portion that is brought into contact with one of the outer surfaces of the overlapping portion in the fastening member. A plurality of leg pieces extending toward each other are fitted, and a tip end of each leg piece protruding from the other outer surface of the overlapping portion is plastically deformed so as to expand laterally.

(2) In the above item (1), both ends of the connecting portion of the fastening member are projected outward from the leg pieces.

(3) In the above item (2), one end of the connecting portion of the fastening member is used as a roller stopper disposed between the upper rail and the lower rail.

(4) In any one of the above items (1) to (3), the width of the connecting portion and the width of the leg in the fastening member are made substantially the same.

(5) In any one of the above items (1) to (4), the connecting portion and the leg of the fastening member are both prismatic.

(6) In any one of the above items (1) to (5), the fastening member is formed by pressing a steel plate.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle seat slide device provided with an embodiment of the present invention will be described with reference to FIGS. The same constituent members as those in the above-described conventional one are denoted by the same reference numerals, and are not illustrated, and detailed description thereof will be omitted.

In this embodiment, a pair of front and rear through holes having a rectangular shape in a plan view are provided at two places (or three or more places) before and after the overlapping portion of the lower rail (1) and the leg bracket (3).
(6) is drilled.

Reference numeral (10) denotes a fastening member made of a material such as a plastically deformable metal which replaces the conventional rivets (7). A pair of legs (12) and (12) (or three or more) facing downwards, which form the same prismatic shape as the connecting part (11) and face downward, are connected to the part slightly inward, side view It is almost π-shaped.

Using this fastening member (10), the lower rail
In order to connect (1) and the leg bracket (3), the lower rails must be aligned so that their through holes (6) are aligned with each other.
(1) and the leg bracket (3) are previously overlapped using a jig or the like, and then the fastening member (10) is oriented as shown in FIG. 3 so that the opening at the upper end of the lower rail (1) is opened. (1a) Insert the lower leg (1) into the lower rail (1) until the connecting part (11) comes into contact with the upper surface of the bottom wall of the lower rail (1).
2) is inserted into the front and rear through holes (6).

Next, both leg pieces (1) projecting downward from the lower surface of the leg bracket (3) are pressed by a pressing device (not shown) or the like.
2) plastically deform the lower end so as to expand laterally,
That is, by caulking, a square caulked portion (13) larger than the opening of the through hole (6) is formed.

The lower rail (1) thus connected.
And leg bracket (3) are two conventional rivets (7)
The two leg pieces (12) of the fastening member (10) corresponding to
1) and are connected to each other by a connecting portion (1
Since 1) is in close contact with the upper surface of the bottom wall of the lower rail 1, an extremely large peel strength between the lower rail 1 and the leg bracket 3 can be obtained.

Also, the front end of the connecting portion (11) is connected to a roller (8).
When used as a stopper, the portion of the fastening member (10) from the front leg piece (12) to the front end of the connecting portion (11) hardly deforms when caulking, so that the positional accuracy of the stopper can be increased. it can.

Furthermore, since the connecting portion (11) of the fastening member (10) is long in the front-rear direction, a sufficient contact area with the lower rail (1) can be ensured even if the width in the left-right direction is small. The width in the left-right direction of the connecting portion (11) and the leg piece (12) of the fastening member (10) is adjusted by the opening (1a) at the upper end of the lower rail (1).
And the fastening member (10) can be mounted from above the lower rail (1).

It is preferable that the front and rear leg brackets (3) provided at the front and rear ends of the lower rail (1) have the same structure as described above, but the rear portion where large peel strength is required. Only the connecting structure of the leg brackets (3) may be the above-described structure, and the connecting structure of all the leg brackets (3) may be the same as the conventional one or another simpler structure.

[0023]

According to the first aspect of the present invention, the fastening member has a structure in which the enlarged heads of a plurality of conventional rivets are connected to each other, and the connecting portion includes a lower rail and a leg bracket. When it is joined by using the same number of conventional rivets as the number of leg pieces by contacting one of the upper and lower outer surfaces of the overlapping part with the upper part and crimping the tip parts of a plurality of leg pieces integral with the connection part As a result, remarkably large peel strength between the lower rail and the leg bracket can be obtained. Also, 1
Since a plurality of portions of the overlapping portion between the lower rail and the leg bracket can be fastened with one fastening member, the number of parts can be reduced as compared with the conventional one using a plurality of rivets, and the assembling and manufacturing operations can be easily performed. Can be.

According to the second aspect of the present invention, the end of the connecting portion protruding outward from the leg piece comes into contact with one of the upper and lower outer surfaces of the overlapped portion of the lower rail and the leg bracket, so that a larger peeling is achieved. Strength is obtained. This has been clarified by a comparison test between a case where the end of the connecting portion protruded outward from the leg piece and a case where the end was not protruded.

According to the third aspect of the present invention, as described above, the portion of the fastening member from the leg piece to the outer end of the connecting portion is hardly deformed at the time of caulking. When the is used as a roller stopper, the positional accuracy of the stopper can be improved.

According to the fourth aspect of the present invention, by pressing the steel plate, the fastening member can be easily manufactured, and the fastening member can be easily inserted from the upper end opening of the lower rail. That is, since the connecting portion of the fastening member is long in the front-rear direction, a sufficient contact area with the lower rail can be secured even if the width in the left-right direction is small,
Therefore, the width of the connecting portion and the leg piece in the fastening member is made smaller than the width of the opening at the upper end of the lower rail, and the fastening member can be mounted from above the lower rail.

According to the fifth aspect of the present invention, the peel strength between the lower rail and the leg bracket can be further increased.

According to the sixth aspect of the invention, the fastening member can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a rear portion of a seat slide device including an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view taken along the line II-II of FIG.

FIG. 3 is an exploded perspective view of a main part.

FIG. 4 is a partially cutaway side view of a seat slide device having a conventional leg bracket mounting structure.

FIG. 5 is an enlarged view of a portion A in FIG. 4;

FIG. 6 is a vertical sectional front view showing a state when a conventional leg bracket is attached.

FIG. 7 is a vertical sectional front view showing the situation after the leg bracket is attached.

[Explanation of symbols]

 (1) Lower rail (1a) Opening (2) Upper rail (3) Leg bracket (4) Seat (5) Locking means (6) Through hole (7) Rivet (8) Roller (10) Fastening member (11) Connection part (12) Leg piece (13) Caulking part

Claims (6)

[Claims] 1. A leg bracket mounting structure for a seat slide device for mounting a leg bracket for mounting a lower rail to a vehicle floor or the like on a front-rear lower rail that slidably supports an upper rail fixed to a seat. A plurality of through-holes are drilled in the overlapping portion between the lower rail and the leg bracket, and each through-hole is identical to each other from a connecting portion that is brought into contact with one of the outer surfaces of the overlapping portion of the fastening member. A plurality of leg pieces extending in the direction are fitted, and a tip end of each leg piece projecting from the other outer surface of the overlapping portion is plastically deformed so as to expand laterally. Mounting structure of the leg bracket in the seat slide device. 2. The leg bracket mounting structure according to claim 1, wherein both ends of the connecting portion of the fastening member project outward from the leg pieces. 3. The leg bracket mounting structure according to claim 2, wherein one end of the connecting portion of the fastening member is a stopper for a roller disposed between the upper rail and the lower rail. 4. The fastening member according to claim 1, wherein the width of the connecting portion and the width of the leg are substantially the same, and the width is smaller than the width of the upper end opening of the lower rail. Mounting structure of leg bracket in seat slide device. 5. The mounting structure for a leg bracket in a seat slide device according to claim 1, wherein the connecting portion and the leg pieces of the fastening member are both prismatic. 6. The leg bracket mounting structure according to claim 1, wherein the fastening member is formed by pressing a steel plate.