JPH061167A - Seat slide device - Google Patents

Abstract

PURPOSE:To shorten a lower rail by improving installation of rollers disposed between an upper rail and the lower rail of a seat slide device. CONSTITUTION:A pair of roller guides 17 having rollers 16 at the front and back thereof are independently disposed on the right and left between U-shaped parts 11 on both sides of an upper rail 2 and a base plate of a lower rail 3. A nut 8 is fixed to the base plate through between both roller guides 17.

Description

Detailed Description of the Invention

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. 3-112729.
As disclosed in the publication, an upper rail for supporting a seat, a lower rail fixed to a floor of a vehicle, a screw nut member with a motor for adjusting the position of the seat by sliding the upper rail forward and backward with respect to the lower rail, and both rails. It is configured to have a roller and a ball for smooth sliding between them.

The upper rail has a main body having a substantially U-shaped section, and the lower rail has a main body having a substantially U-shaped section. Arrange
Further, the both side protruding portions of both rails are slidably related to each other via balls to secure the slidable relationship of both rails. The front roller is composed of a pair of rollers that are separated from each other in the left and right directions, and is positioned in front of the nut of the screw nut member to avoid the screw of the screw nut member. Therefore, it is necessary to make the front portion of the lower rail as long as possible in order to obtain a space for arranging the front roller.

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

[0005]

As described above, the prior art has the drawback that the lower rail becomes long and rattling occurs between both rails. Therefore, the present invention
The problem to be solved is to solve the above-mentioned problems of the conventional technology.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention basically does not connect left and right rollers but connects front and rear rollers, and a screw nut member between the left and right rollers. The nuts can be placed and both sides of both rails are in sliding relation via resin shoes.

More specifically, the present invention specifically relates to an upper rail that supports a screw nut member; a lower rail that fixes the nut of the screw nut member and is slidable with respect to the upper rail; and the upper rail that holds the screw of the screw nut member. The lower rail is flat with a substantially inverted U-shaped section through which the nut is housed and a substantially U-shaped section that extends laterally outward from the lower portions of the opposite side walls that form the inverted U-shaped section. A board to which the nut is fixed, and a substantially inverted cross-section L extending upward from both ends of the board.
A pair of roller guides arranged so as to extend in the longitudinal direction between the bottom wall of the U-shaped portion on both sides of the upper rail and the base plate of the lower rail, and having rollers attached at both ends thereof; Provided is a seat slide device having a plurality of synthetic resin shoes fixed to the tip of an inverted L-shaped portion of a lower rail and engaging with U-shaped portions on both sides of the upper rail.

[0008]

When the screw nut member is actuated by the 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 a roller guide,
The relative position between the rollers and the relative position between the shoe and the rollers between both rails do not change, and the sliding relationship between both rails can be maintained smoothly.

[0009]

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 mounted in a sliding relationship with the upper rail 2 and fixed to a vehicle floor.
And a screw nut member 4 supported by the upper rail 2. The worm of the screw nut member 4 and the worm wheel portion 5 are fixed to the front end of the upper rail 2 with screws 6, and the rear end of the screw 7 is rotatably supported by the rear end of the upper rail 2. The nut 8 screwed onto 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 portion 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
Is composed of a substantially inverted U-shaped section 9 for accommodating the screw 7 and the nut 8, and a substantially U-shaped section 11 protruding laterally outward from each lower part of the opposed spaced side wall 10 forming the inverted U-shaped section 9. .

The lower rail 3 is provided with a flat substrate 12 and a substantially inverted L-shaped section 13 which extends upward from both ends of the substrate 12. A plurality of shoes 14 made of synthetic resin, which are spaced apart from each other, are fixed to the tip downward portion of the inverted L-shaped portion 13. This shoe 1
4 fits into the opening of the U-shaped portion 11 of the upper rail 2 to make the sliding of both rails 2 and 3 smooth. A part of the nut 8 arranged between the both side walls 10 of the upper rail 2 extends downward and is fixed to the substrate 12 with a bolt 15.

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 it.
Distribute. The front and rear rollers 16 are housed in the front and rear holes of the roller guide 17. That is, the roller guides 17 extend on both sides of the nut 8 in the longitudinal direction. Also, roller guide 1
7 is slidable between both rails 2 and 3.

While the upper rail 2 is moving forward and backward 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 are guided by the roller guide 17.
Keeps the pitch constant by the rollers 16 on both sides.
Keeps a constant distance without being obstructed by the nut 8 and the screw 7. This means that Laura 16
The positional relationship between the roller 16 and the shoe 14 is always kept constant, and there is no play between the rails 2 and 3.

[0014]

[Effect] According to the present invention, since the left and right rollers are not connected to each other and are independent of each other, the lower rail is set to the minimum length allowed by the design regardless of the position of the nut, and the rollers are arranged on both sides of the lower rail. be able to. That is, the lower rail can be shortened. Further, since the screw can be arranged regardless of the roller, the roller length can be shortened.

[Brief description of 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 the line III-III in FIG.

[Explanation of symbols]

 2 Upper rail 3 Lower rail 4 Screw nut member 7 Screw 8 Nut 9 Reverse U-shaped portion 11 U-shaped portion 12 Substrate 13 Reverse L-shaped portion 14 Shoe 16 Roller 17 Roller guide

Claims (1)

[Claims] 1. An upper rail that supports a screw nut member; a lower rail that fixes the nut of the screw nut member and is slidable with respect to the upper rail; a cross section in which the upper rail passes the screw of the screw nut member and accommodates the nut. A substrate having a substantially inverted U-shaped portion, and a substantially U-shaped cross-section that extends laterally outward from respective lower portions of opposing side walls that form the inverted U-shaped portion, and the lower rail is flattened to fix the nut; And a substantially inverted L-shaped section in cross section extending upward from both ends of the substrate; arranged so as to extend in the longitudinal direction between the bottom wall of the U-shaped portions on both sides of the upper rail and the substrate of the lower rail. And a pair of roller guides having rollers attached to both ends thereof; and fixed to the tip of the inverted L-shaped portion of the lower rail and to U-shaped portions on both sides of the upper rail. A seat slide device having a plurality of synthetic resin shoes that engage with each other.