JP3114371B2 - Seat slide device - Google Patents

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 having an upper rail and a roller rail.

[0002]

2. Description of the Related Art A seat slide device is disclosed in Japanese Patent Laid-Open No. 64-9043.
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. Hei. 3-112729, an upper rail for supporting a seat, a lower rail fixed to a vehicle floor, and a gear for adjusting the position of the seat by sliding the upper rail back and forth with respect to the lower rail. This is a configuration having a screw nut member with a box and rollers and balls for smooth sliding between both rails.

The upper rail has a main body having a substantially inverted U-shaped section, and the lower rail has a main body having a substantially U-shaped cross section. Rollers are provided at front and rear portions of a space in which the inverted U-shaped part and the U-shaped part are opposed to each other. Arrange
In addition, the overhanging portions of both rails are made to have a sliding relationship via the balls, so that the sliding relationship between both rails is ensured. The front roller is composed of a pair of rollers separated to the left and right, is located forward of the nut of the screw nut member, and avoids the screw of the screw nut member. For this reason, it is necessary to make the front part of the lower rail as long as possible to obtain a space for disposing the front roller.

In addition, since the gear box is fixed to the tip of the upper rail, it is necessary to lengthen the upper rail so that the gear box does not hit the tip of the lower rail even when the upper rail is at the rearmost position.

Further, since the front and rear rollers move independently of each other and roll independently of the balls, the relative positional relationships between the rollers and between the rollers and the balls are deviated. Rattling occurs in the sliding of.

[0006]

As described above, the prior art has the drawbacks that the upper rail and the lower rail become longer, and that the two rails are rattled. Therefore, an object of the present invention is to solve the above-mentioned disadvantages of the related art.

[0007]

According to the present invention, in order to solve the above-mentioned problems, basically, the upper portions of the left and right inverted L-shaped portions of the lower rail are notched, and further, the left and right rollers are not connected. A means for connecting the front and rear rollers, enabling the nut of the screw nut member to be arranged between the left and right rollers, and making both sides of both rails have a sliding relationship via resin shoes.

The present invention specifically provides an upper rail for supporting a gear box and a screw nut member; a lower rail for fixing a nut of the screw nut member and being slidable with respect to the upper rail; A substantially U-shaped cross-section for passing the screw and receiving the nut, and a substantially U-shaped cross-section that extends outwardly and laterally from each lower portion of the opposing side wall that constitutes the inverted U-shape. A substrate on which the nut is fixed by flattening, and a substantially inverted L-shaped section extending above both ends of the substrate; a bottom wall of a U-shaped part on both sides of the upper rail and a substrate of the lower rail; A pair of left and right roller guides extending longitudinally therebetween and having rollers mounted at both ends thereof;
U at both ends of the upper rail
A plurality of synthetic resin shoes engaged with the lower portion; at least the upper portion of the inverted L-shaped portion at the distal end of the lower rail is cut off and fixed to the distal end of the upper rail when the upper rail retreats last; In addition, the present invention provides a seat slide device in which the gear box is located in a notch at the end of the lower rail.

[0009]

When the upper rail is retracted to the last, the gear box fixed to the tip of the upper rail can be positioned on the tip of the lower rail by the notch of the lower rail.
At this time, since the roller is located below the notch and at a position irrelevant to the movement trajectory of the gear box,
Allows the gearbox to move over the lower rail tip. Further, since the rollers disposed between the two rails are distributed to the left and right and the front and rear rollers are connected by a roller guide, there is no change in the relative position between the rollers and the relative position between the shoe and the rollers between the two rails. The sliding relationship between both rails can be kept smooth.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat slide device 1 includes an upper rail 2 for supporting a seat, and a lower rail 3 assembled in a sliding relationship with the upper rail 2 and fixed to a floor of a vehicle.
And a screw nut member 4 supported by the upper rail 2. Gear box 5 of screw nut member 4
Are fixed to the front end of the upper rail 2 using screws 6,
The rear end of the screw 7 is rotatably supported by the rear end of the upper rail 2. A nut 8 screwed to the screw 7 is fixed to the lower rail 3. The rotational torque of the motor is transmitted to the screw 7 via the gear box 5, and when the screw 7 rotates, the upper rail 2 moves forward and backward along the lower rail 3 because the nut 8 is fixed to the lower rail 3.

As is apparent from FIG. 3, the upper rail 2
Consists of a substantially U-shaped section 9 for accommodating the screw 7 and the nut 8, and a substantially U-shaped section 11 protruding outward from the lower portion of each of the opposed spaced side walls 10 forming the inverted U-shaped section 9. .

The lower rail 3 includes a flat substrate 12, and a substantially inverted L-shaped section 13 extending upward from both ends of the substrate 12. A plurality of synthetic resin shoes 14 that are spaced apart from each other at the downward end of the inverted L-shaped portion 13 are fixed. This shoe 1
4 fits into the opening of the U-shaped portion 11 of the upper rail 2 to smoothly slide the rails 2 and 3. A part of the nut 8 disposed between the side walls 10 of the upper rail 2 extends downward and is fixed to the board 12 with bolts 15. The upper part of the inverted L-shaped part 13 at the tip of the lower rail 3 is cut off to form a notch 18. The notch 18 is, as shown in FIG.
When the upper rail 2 is in the retracted position, the gearbox 5
Can enter the upper part of the notch 18. That is, the upper rail 2 can be shortened accordingly.

A roller 16 is provided between both U-shaped portions 11 of the upper rail 2 and the substrate 12 of the lower rail 3 and before and after that.
Distribute. The front and rear rollers 16 are accommodated in holes at the front and rear portions of the roller guide 17. That is, the roller guide 17 extends on both sides of the nut 8 in the longitudinal direction. Roller guide 1
7 is slidable between the rails 2 and 3.

While the upper rail 2 is moving back and forth with respect to the lower rail 3 by the rotation of the screw 7 of the screw nut member 4, the front and rear rollers 16
To keep the pitch constant, and the rollers 16 on both sides
Keeps a constant interval without its movement being hindered by the nut 8 and the screw 7. This is because Roller 16
The positional relationship between the roller 16 and the shoe 14 is always kept constant, so that there is no play between the rails 2 and 3.

[0015]

According to the present invention, since the left and right rollers are not connected to each other but are formed independently, the lower rail is set to the minimum length allowed in the design regardless of the position of the nut, and the rollers are arranged on both sides thereof. be able to. That is, the lower rail can be shortened. Further, since the screws can be arranged regardless of the rollers, the screw length can be shortened. Importantly, the arrangement of the rollers as described above allows the gearbox to be moved to the front end of the lower rail, thus allowing the upper rail to be shorter.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an example of the present invention.

FIG. 2 is a front view of an example of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

[Explanation of symbols]

 2 Upper rail 3 Lower rail 5 Gear box 7 Screw 8 Nut 9 Reverse U-shaped part 11 U-shaped part 12 Substrate 13 Reverse L-shaped part 14 Shoe 16 Roller 17 Roller guide 18 Notch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60N 2/00-2/72

Claims (1)

(57) [Claims] An upper rail for supporting a gear box and a screw nut member; a lower rail for fixing the nut of the screw nut member and being slidable with respect to the upper rail; It has a substantially inverted U-shaped section to be housed, and a substantially U-shaped section extending outward from each lower part of the opposing side wall constituting the inverted U-shaped section, and the lower rail is flattened to fix the nut. A substrate to be formed, and a substantially inverted L-shaped section extending above both ends of the substrate; extending in the longitudinal direction between the bottom wall of the U-shaped part on both sides of the upper rail and the substrate of the lower rail. A pair of left and right roller guides having rollers mounted at both ends thereof; and the upper array fixed to the tip of an inverted L-shaped portion of the lower rail. A plurality of synthetic resin shoes engaged with U-shaped portions on both sides of the lower rail; at least the upper portion of the inverted L-shaped portion at the tip of the lower rail is cut off, and the upper rail is retracted when the upper rail retreats most. A seat slide device in which the gear box fixed to the end of the lower rail is located in a notch at the end of the lower rail.