JP3151944B2 - Seat slide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] 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. 3-112729.
As disclosed in Japanese Patent Laid-Open Publication No. H07-115, an upper rail supporting a seat, a lower rail fixed to the floor of a vehicle, a screw nut member with a motor for adjusting the position of the seat by sliding the upper rail back and forth with respect to the lower rail, and both rails It has a roller and a ball for smooth sliding between them.

The upper rail has a main body having a substantially U-shaped cross 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 where the inverted U-shaped portion and the U-shaped portion 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 that are separated to the left and right, and is located forward of the nut of the screw nut member to avoid 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.

Further, since the front and rear rollers move independently of each other and roll independently of the balls, there is a deviation in the relative positional relationship between the rollers and between the rollers and the balls. Rattling occurs in the sliding of.

[0005]

As described above, the prior art has the drawbacks that the lower rail becomes longer and that the two rails are loose. Therefore, the present invention
It is an object to solve the above-mentioned problems of the prior art.

[0006]

According to the present invention, in order to solve the above-mentioned problems, basically, the left and right rollers are not connected, but the front and rear rollers are connected, and a screw nut member is provided between the left and right rollers. And a means for sliding both sides of both rails through a resin shoe.

Specifically, the present invention provides an upper rail for supporting a screw nut member; a lower rail for fixing a nut of the screw nut member and slidably holding the upper rail; And a substantially U-shaped cross-section for receiving the nut, and a substantially U-shaped cross-section extending from each lower portion of the opposing side wall forming the inverted U-shaped portion outwardly, and the lower rail is flattened. And a substantially inverted L-shaped section extending above both ends of the substrate; and a bottom wall of a U-shaped portion on both sides of the upper rail and a substrate of the lower rail. A pair of roller guides disposed longitudinally therebetween and having rollers mounted at both ends thereof; the rollers are accommodated in holes at the front and rear portions of the pair of roller guides. And a seat slide device having a plurality of synthetic resin shoes fixed to the tip of the inverted L-shaped portion of the lower rail and engaged with U-shaped portions on both sides of the upper rail. provide.

[0008]

When the screw nut member is operated by a motor, the upper rail slides in the front-rear direction with respect to the lower rail due to the rotation of the screw screwed with the nut on the lower rail side. Since the rollers arranged between both rails are distributed to the left and right and the front and rear rollers are connected by roller guides,
There is no change in the relative position between the rollers and the relative position between the shoe and the roller between the two rails, and the sliding relationship between the two rails can be kept smooth.

[0009]

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. The worm and the worm wheel portion 5 of the screw nut member 4 are fixed to the front end of the upper rail 2 using screws 6, and 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 rotation torque of the motor is transmitted to the screw 7 via the worm and the worm wheel 5, and when the screw 7 rotates, the nut 8 is fixed to the lower rail 3, so that the upper rail 2 moves forward and backward along the lower rail 3. become.

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 each lower portion of the opposed spaced side wall 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 above 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.

A roller 16 is located between the U-shaped portions 11 of the upper rail 2 and the substrate 12 of the lower rail 3 and before and after the U-shaped portion 11.
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.

[0014]

According to the present invention, since the left and right rollers are not connected to each other but are independent, 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 roller length can be reduced.

[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 4 Screw nut member 7 Screw 8 Nut 9 Reverse U-shaped part 11 U-shaped part 12 Board 13 Reverse L-shaped part 14 Shoe 16 Roller 17 Roller guide

──────────────────────────────────────────────────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 the screw nut member; a lower rail for fixing the nut of the screw nut member and slidably holding the upper rail; and allowing the upper rail to pass through a screw of the screw nut member. And a substantially U-shaped section in which the nut is housed, and a substantially U-shaped section that projects laterally outward from each lower portion of the opposing side wall that constitutes the inverted U-shaped section, wherein the lower rail is flattened and A substrate on which the nut is fixed, and a substantially inverted L-shaped section extending above both ends of the substrate; and further between a bottom wall of a U-shaped portion on both sides of the upper rail and the substrate of the lower rail. the hole in the front and rear portions of the roller guide of the rollers the pair; longitudinal to extend the arranged is and roller guide pair fitted with a roller at its opposite ends
It is housed and the left and right independently of each shape; Further, seat slide device having a plurality of synthetic resin shoe which engages the sides of the U-shaped portion of the inverted L-shaped portion is fixed to the tip and the upper rail of the lower rail .