JPH09202163A - Seat sliding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent spatter from entering the interior space in a lower rail and sticking thereto at the time of welding by connecting the outside circumference of the lower rail to the bent portion of a leg by welding. SOLUTION: A leg base substance 3A is bent in steps and the bottom part 2A of a lower rail 2 is supported along the top of an upper base substance 3A1. An end part 2C of the lower rail 2 extends in a protruding manner to a lower part base substance 3A2 from a first bent portion 3C bended from the upper part base substance 3A1. The lower surface, which is the outside circumferential surface of the extended end part 2C of the lower rail 2, and the upper surface of a bent portion 3D of the leg base substance 3A are arc welded together at the first bent portion 3C. The welded part 10A is made in a shape forming nearly a V shaped flare coupling. Thus not only can defective welding such as undercutting be restrained but spatter can be prevented from entering the interior of the lower rail 2 at the time of welding and the function of the lower rail 2 is never impaired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat slide device, and more particularly to a structure of a welded portion between a lower rail of the seat slide device and a leg for fixing the lower rail to the floor of a vehicle.

[0002]

2. Description of the Related Art Generally, a vehicle seat is fixed to the floor of the body of the vehicle. Particularly, in the case of a driver seat, it is necessary to provide convenience when seated according to the physical condition of the driver. For example, the seat is configured to be movable in the front-rear direction. Such a seat slide device is capable of moving and locking the seat in the front-rear direction via the lower rail, both ends of which are fixed to the floor via legs, the upper rail to which a seat and a safety device related to the seat are attached, and the upper rail. It is composed of a position adjusting mechanism and the like.

FIG. 3 and FIG. 4 show an example of a conventional welding structure of such a lower rail and a leg. In addition, FIG.
The lower rail 2 and the bent upper surface of the leg 3 are welded by arc welding. FIG. 4 shows the upper end surface of a rib raised from the upper surface of the leg 3 to hold the lower rail 2. And the side surface near the end of the lower rail 2 are welded by arc welding. In these drawings, 1A and 1B are weld beads (hereinafter referred to as welded portions) welding the lower rail 2 and the leg 3, and the leg 3 is provided with a bolt hole 4 for fixing to the vehicle floor. There is. In addition, lower rail 2
An upper rail (not shown) is movably held in the guide groove 5.

[0004]

However, among the above-mentioned conventional examples, as shown in FIG. 3, in the structure in which the end surface of the lower rail 2 and the upper surface bent portion of the leg 3 are welded,
Spatter generated during the arc welding may intrude and adhere from the end surface of the lower rail 2 to the inner surface of the lower rail 2, and hinder the movement of the upper rail that moves in the lower rail 2 via the rolling elements.

Further, as shown in FIG. 4, in the structure in which the upper end surface of the rib of the leg 3 and the side surface near the end portion of the lower rail 2 are welded, they are generated on the inner surface of the lower rail 2 during welding. There is no risk of spatter entering, but in this case as well,
Since the rib upper end surface which is a sheared surface and the side surface near the end portion of the lower rail 2 which is a continuous surface have different heat transfer forms, welding defects such as undercut are likely to occur.

Therefore, when a load is applied to the welded portions 1A and 1B, a crack is generated at or near the welded portions, which causes a problem in fixing the lower rail 2.

An object of the present invention is to pay attention to the above-mentioned conventional problems, and in order to solve the problems, it is possible to prevent spatters from entering the lower rails so that the lower rails will not be impaired in their functions, and the lower rails and the legs will not interfere. It is to provide a seat slide device capable of maintaining sufficient connection strength between the seat slide device and the seat slide device.

[0008]

In order to achieve the above object, the present invention provides a lower rail for keeping an upper rail to which a seat or the like is attached movably, and a bending work for fixing the lower rail to a floor of a vehicle. A seat slide device having a lower leg and the lower rail and the leg joined by welding, wherein the outer peripheral surface of the lower rail and the bent portion of the leg are joined by welding. is there.

According to the present invention, since the lower rail and the leg are welded between the surfaces, and the welded portion is located at a position removed from the end surface of the lower rail, spatter enters from the end portion of the lower rail to the inner surface. Can be prevented and the reliability of strength can be improved.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In addition,
FIG. 1 (A) shows its basic configuration. Here,
3A is a base of the leg 3 and 3B is a rib that is erected from both sides of the upper surface of the base 3A along the side surface 2B near the end of the lower rail 2. The leg base 3A is bent stepwise, and the bottom 2A of the lower rail 2 is held along the upper surface of the upper base 3A1. 3C is a first bent portion bent from the upper base body 3A1 of the leg 3, and an end portion of the lower rail 2 extends from the first bent portion 3C so as to project toward the lower base body 3A2 side. ing. 3D is first
The base body bent portion 2C bent from the upper base body 3A1 at the bent portion 3C is the extending end portion of the lower rail 2 described above.

In this embodiment, however, the lower surface which is the outer peripheral surface of the extending end portion 2C of the lower rail 2 and the upper surface of the bent portion 3D of the leg base 3A are arc-welded at the first bent portion 3C. It 10A is the welded portion, which is in the form of a substantially V-shaped flare joint.

By welding between the plate surfaces of the lower rail 2 and the leg 3 as in this embodiment, welding defects such as undercut can be suppressed and the inner surface of the lower rail 2 during welding can be suppressed. The spatter is prevented from entering and the function of the lower rail 2 is not impaired.

The examples shown in FIGS. 1B to 1D are as follows.
The extending end 2C of the lower rail 2 has a different shape. In any case, at least the bottom 2A of the extending end 2C of the lower rail 2 is lower base 3A2.
(See FIG. 1 (A)) side. FIG. 1B shows the lower rail 2 with only the bottom 2A thereof extending, and FIG. 1C shows the lower rail 2 with only the bottom 2A of the extending end 2C formed obliquely. In FIG. 1D, only the bottom portion 2A is extended so that the end face of the extended end portion 2C is smoothly raised. The shape of the extended end portion 2 is at least the bottom portion 2A involved in welding.
Any shape may be used as long as it extends.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the upper ends of the ribs 3B on which the legs 3 are raised are bent outward to form a flange portion 3E, and a flare joint is formed along the flange bending portion 3F with the side surface 2B of the lower rail 2. Is welded in such a form that 2A and 2B show the leg 3 as in the conventional example shown in FIG. 4, that is, the leg 3 supports the lower rail 2 in the form of a cantilever, and the side ribs 3B are lowered. An example of application to a leg 3 having a bolt hole 4 for fixing in a portion is shown. FIG. 2C shows a configuration in which ribs 3B are formed on both sides of the leg base 3A as in the conventional example shown in FIG. An example of application to

In FIGS. 2A, 2B and 2C, 10B is the welded portion. In addition, (A) of FIG.
In the case of (B), welding is performed only between the one side surface 2B of the lower rail 2 and the rib 3 that is in contact with the side surface 2B, so that the welding length is as shown in FIG. Needless to say, consideration must be given to factors related to welding strength, such as welding length, so that sufficient welding strength can be maintained as compared with the case of C).

Also in this embodiment, since the lower rail 2 and the rib 3 are welded so as to form a flare joint, welding defects such as undercut can be prevented, and the lower rail can be prevented. There is no problem due to welding spatters entering and adhering to the inside of 2, so that the rolling of the driving body related to the movement of the upper rail is not hindered.

Among the above-mentioned embodiments, the first embodiment shows an example of application to the leg 3 of the conventional example shown in FIG. 3, and the second embodiment shows FIGS. 3 and 4. Although the examples of application to both types of legs 3 have been described, it goes without saying that the first embodiment can be applied to the cantilever type legs 3 shown in FIG. 4, and further, It is also possible to carry out welding of both in a form in which the first embodiment and the second embodiment are combined.

[0019]

As described above, according to the present invention,
A seat slide device having a lower rail that keeps an upper rail to which a seat or the like is attached movably and a leg that is bent to fix the lower rail to the floor of a vehicle, and the lower rail and the leg are joined by welding. Since the outer peripheral surface of the lower rail and the bent portion of the leg are joined by welding, spatter during welding of the lower rail and the leg is prevented from entering and adhering to the inner space of the lower rail. It is possible to prevent a defect due to adhesion, that is, a hindrance to rolling of the rolling element for keeping the upper rail movable. Furthermore, due to the problem that occurs when welding is performed between one end surface of the lower rail or leg and the other plate surface as in the past, that is, undercut occurs due to the difference in heat input during welding. Welding defects can be prevented, and the welded portion between the lower rail and the leg can have a reliable welded structure.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration according to a first embodiment of the present invention by a basic example (A) and other examples (B), (C) and (D).

FIG. 2 is a first example of two configurations according to a second embodiment of the present invention.
It is explanatory drawing shown by the perspective view (A) and sectional drawing (B) of an example, and the perspective view (C) of a 2nd example.

FIG. 3 is an explanatory view showing a configuration according to a conventional example by a perspective view (A) and a partially crushed sectional view (B).

FIG. 4 is an explanatory view showing another configuration according to a conventional example by a perspective view (A) and a sectional view (B).

[Explanation of symbols]

 1A, 1B, 10A, 10B Welded portion 2 Lower rail 2A Bottom portion 2B Side surface (of lower rail) 2C Extended end portion 3 Leg 3A Base body 3B Rib 3C First bent portion 3D Base body bent portion 3E Flange portion 3F (Flange) bent Department

Claims (1)

[Claims] 1. A lower rail for keeping an upper rail to which a seat or the like is attached movably, and a leg bent to fix the lower rail to a floor of a vehicle, and the lower rail and the leg are joined by welding. The seat slide device described above, wherein the outer peripheral surface of the lower rail and the bent portion of the leg are joined by welding.