JP2003146118A - Slide device for seat of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide device for a seat of a vehicle realizing a long stroke with a simple structure. SOLUTION: In the slide device provided with a slide rail 1 supporting an upper rail 2 and a lower rail 3 in a vertical direction by a roller 4 and enabling relative slide of the upper rail 2 and the lower rail 3 by rolling motion of the roller 4, the roller 4 has a structure provided with a large diameter rolling part 5 and a small diameter rolling part 6 coaxially, one of the large diameter rolling part 5 and the small diameter rolling part 6 keeps rolling contact on the upper rail 2 side and another keeps tolling contact on the lower rail 3 side. Slide stroke S can be increased further by increasing length of either of the upper rail 2 or the lower rail 3 with this structure. Lengthening stroke of the slide device is realized with controlling enlargement thereof as small as possible, increase in commercial value of the seat for the vehicle provided with the slide device can be expected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat slide device.

[0002]

2. Description of the Related Art FIG. 4 shows a general vehicle seat 10. The seat 10 is configured to include a seat cushion 11 serving as a seating portion and a seat back 12 serving as a backrest portion. The seat 10 is attached to a vehicle body floor 17 side via a slide rail 13. ,
It is slidable in the seat front-rear direction between a retracted position shown by a solid line in the figure and an advanced position shown by a chain line.

The slide rail 13 is shown in FIGS.
As shown in FIG. 1, the lower rail 1 fixedly arranged on the vehicle body floor 17 side via a pair of front and rear brackets 16, 16.
5 and the lower rail 15 are slidably fitted in the axial direction and seat cushion 11
And an upper rail 14 fixed to the lower surface side of the.

As shown in FIG. 5, the upper rail 14 has a substantially inverted T-shaped cross section, and its flat lower surface is a rolling surface 14a. Further, the lower rail 15 is
It has a square C-shaped cross-section and its flat bottom surface is the rolling surface 1.
5a. Then, the slide rail 13 composed of the upper rail 14 and the lower rail 15 is
A roller 18 having a straight axis is provided between the rolling surface 14a of the upper rail 14 and the rolling surface 15a of the lower rail 15 so that the upper rail 14 and the lower rail 15 can slide relative to each other in the axial direction. Slide rail 1 direction
3 is arranged in a direction orthogonal to the sliding direction, and the upper rail 14 and the lower rail facing the upper surface of the rolling surface 14a of the lower rail 15 to prevent the upper rail 14 and the lower rail 15 from being separated from each other. 15 between the upper rolling surfaces 15b and 15b of the ball 15
9 and 19 are inserted.

In the slide device constructed as described above, the sheet 1 is moved by the rolling operation of the roller 18.
The slide of 0 in the front-back direction is realized.

[0006]

By the way, in recent years, there is a tendency to favor the enlargement of a vehicle as a user orientation, and in response to this, in the vehicle seat, the slide stroke in the front-rear direction is lengthened, so-called "long stroke". The demand for "incarnation" is becoming stronger.

In the conventional slide device, the relative slide is realized by the linear shaft-shaped roller 18 interposed between the upper rail 14 and the lower rail 15 as described above. For example, in FIG.
From the initial position schematically shown in (a), the upper rail 14
If the to be relatively slid with respect to the lower rail 15, as shown in FIG. (B), the lower rail side movement amount L ₁ and the roller 18 to the roller 18 rolls on the lower rail 15 on the upper rail 14 The rolling amount L ₂ on the upper rail side is the same, and the sum of the moving amounts L ₁ , L _{2 on} the lower rail sides is the slide stroke “S”.

Therefore, in order to increase the slide stroke "S", the upper rail 14 and the lower rail 1 are arranged.
It is necessary to increase the rollable distance of the roller 18, that is, to increase the rail length in both cases No. 5 and, as a result, "long stroke" is achieved particularly in the vehicle seat where the space for arrangement is limited. Will be difficult to achieve.

Therefore, the present invention has been made for the purpose of providing a sliding device for a vehicle seat which realizes a longer stroke with a more compact structure.

[0010]

In the present invention, the following constitution is adopted as a concrete means for solving such a problem.

In the first invention of the present application, the upper rail 2 fixed to the seat 10 side and the lower rail 3 fixed to the vehicle body floor 17 side are supported in the vertical direction by the roller 4 interposed therebetween. Then, in the vehicle seat slide device including the slide rail 1 in which the upper rail 2 and the lower rail 3 are relatively slidable in the axial direction by rolling of the roller 4, the roller 4
Is provided with the large diameter rolling portion 5 and the small diameter rolling portion 6 coaxially, and one of the large diameter rolling portion 5 and the small diameter rolling portion 6 is disposed on the upper rail 2 side. It is characterized in that the other one is brought into rolling contact with the lower rail 3 side.

According to a second aspect of the present invention, in the vehicle seat slide device according to the first aspect, the relative slide between the upper rail 2 and the lower rail 3 is interposed between the upper rail 2 and the lower rail 3. the ratio "r ₁ / r _2" between the rolling radius "r _1" with respect to the upper rail 2 of the ball 7 rolling the rolling radius "r _2" with respect to the lower rail 3 in association with the above the roller 4 To the ratio "D ₁ / D ₂ " of the diameter "D ₁ " of the large diameter rolling portion 5 and the diameter "D ₂ " of the small diameter rolling portion 6 or to the diameter "D of the small diameter rolling portion (6). ₂ ”and the diameter“ D ₁ ”of the large diameter rolling portion (5) are substantially matched with the ratio“ D ₂ / D ₁ ”.

[0013]

According to the present invention, the following effects can be obtained by adopting such a configuration.

According to the vehicle seat slide device of the first invention of the present application, the roller 4 is configured to have the large diameter rolling portion 5 and the small diameter rolling portion 6 coaxially, and Since one of the large diameter rolling portion 5 and the small diameter rolling portion 6 is brought into rolling contact with the upper rail 2 side and the other is brought into rolling contact with the lower rail 3 side, respectively, as shown in FIG.
As shown in (b), the slide stroke “S” of the slide rail 13 as a whole is determined by the amount of movement “La” due to the rolling of the large diameter rolling portion 5 of the roller 4 and the rolling of the small diameter rolling portion 6. The sum of the movement amount “Lb” due to is “La + Lb”,
Moreover, the movement amount "La" on the large diameter rolling portion 5 side and the small diameter rolling portion 6
The side movement amount "Lb" corresponds to the ratio of the diameter dimension of the large diameter rolling portion 5 to the diameter dimension of the small diameter rolling portion 6, so that the slide stroke "S" can be further increased. It suffices to increase the length of either the upper rail 2 or the lower rail 3, and the enlargement of the device due to the long stroke of the slide device is suppressed as much as possible, and as a result, the arrangement space is restricted. A long stroke of the slide device is realized in the vehicle seat, and further, the commercial value of the vehicle seat can be expected to be improved by expanding the functions of the vehicle seat provided with the slide device.

According to the vehicle seat slide device of the second invention of the present application, in the vehicle seat slide device of the first invention, the vehicle seat slide device is interposed between the upper rail 2 and the lower rail 3. A rolling radius “r” of the ball 7 rolling with the relative sliding of the upper rail 2 and the lower rail 3 with respect to the upper rail 2
₁ ”and the rolling radius“ r ₂ ”with respect to the lower rail 3“ r ₁ / r ₂ ”, the diameter“ D ₁ ”of the large diameter rolling portion 5 of the roller 4 and the small diameter rolling portion 6 Ratio of diameter "D ₂ " to "D
To ₁ / D ₂ ", or the ratio" D ₂ / D ₁ "between the diameter of the small-diameter rolling portion 6" D ₂ "and a diameter" D ₁ of the said large-diameter rolling motion unit 5 ",
When the upper rail 2 and the lower rail 3 slide relative to each other, the large-diameter rolling portion 5 of the roller 4 rolls between the upper rail 2 and the lower rail 3 because they substantially match each other. The ratio of the moving distance to the rolling distance between the lower rail 3 or the upper rail 2 of the small diameter rolling portion 6, the rolling distance between the ball 7 and the upper rail 2 or the lower rail 3, and the lower rail. 3 or the ratio to the rolling distance with the upper rail 2 substantially matches. As a result, when the upper rail 2 and the lower rail 3 slide relative to each other due to the rolling of the roller 4, the ball 7 rolls reliably without slippage, so that the sliding resistance caused by the sliding of the ball 7 Is prevented, the sliding operation of the slide rail 13 becomes lighter, and the performance of the slide device can be improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main part of a slide device according to the present invention. This slide device has the same structure as the conventional slide device shown in FIG. 4, and is configured to include an upper rail 2 fixed to the seat side and a lower rail 3 fixed to the vehicle body side. In addition, the roller 4 and the pair of left and right balls 7, 7 arranged between the two can be relatively slid in the axial direction by the rolling operation. Hereinafter, the configuration and the like of this slide device will be specifically described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the upper rail 2 has a support portion 2 which is bent downward in a substantially "U" shape.
a and a pair of left and right roller portions 2b, 2b extending laterally from both lower ends of the support portion 2a, and each roller portion 2b,
2b has a bent cross-sectional shape including a pair of left and right ball rolling portions 2c, 2c extending continuously upward and inclined.

The lower rail 3 has a substantially "U" -shaped cross-sectional shape that opens upward as a whole,
A roller rolling portion 3a having a smooth surface located at the center of the lower end,
The roller rolling portion 3a is provided with a pair of left and right bent portions 3b, 3b that rise upward from both ends and are bent inward in a substantially "inverted V" shape. The portions of the lower rail 3 that are located on both sides of the bending point of the bending portion 3b are referred to as ball receiving portions 3c and 3d, respectively.

The upper rail 2 and the lower rail 3 are provided with the upper rail 2 inside the lower rail 3 and the upper rail 2 and the lower rail 3 are connected to the roller portions 2b and 2b of the upper rail 2 and the lower rail 3 respectively.
Roller 4 described below, which is interposed between the roller rolling portion 3a and the ball rolling portion 2c of the upper rail 2,
2c and the bent portions 3b, 3b of the lower rail 3 are assembled in a state of being separated and held by a pair of left and right balls 7, 7 arranged respectively.

The roller 4 has a large diameter rolling portion 5 (outer diameter D ₁ ) at the center in the axial direction, and a small diameter rolling portion 6 (outer diameter D ₂ ) on both axial sides of the large diameter rolling portion 5. Are each formed of a stepped shaft provided coaxially. And this roller 4
In the assembled state on the slide rail 1 side, the large diameter rolling portion 5 contacts the roller rolling portion 3a of the lower rail 3, and the small diameter rolling portions 6 and 6 are respectively the upper rails. The two roller portions 2b, 2b are in contact with each other.

In this case, the upper part of the large-diameter rolling portion 5 of the roller 4 enters the inside of the roller portion 2b of the upper rail 2 in a non-contact state. In this embodiment, the ratio "D ₁ / D ₂ " of the outer diameter "D ₁ " of the large diameter rolling portion 5 and the outer diameter "D ₂ " of the small diameter rolling portion 6 is "(D ₁ / D ₂ )
= 1/2 ".

On the other hand, as shown in an enlarged view in FIG. 2, the ball 7 includes a ball rolling portion 2c of the upper rail 2 and a pair of ball receiving portions 3c and 3d provided on the bent portion 3b of the lower rail 3. It is supported by abutting on each of the three. In this case, the contact point P ₁ , of the ball 7 with respect to the pair of ball receiving portions 3c, 3d of the lower rail 3,
A straight line L ₀ passing through the center of the ball 7 and a straight line L ₂ passing through the contact point P ₂ of the ball 7 with the ball rolling portion 2c of the upper rail 2 are assumed to be parallel to the straight line L ₁ connecting P _2. In such a case, the distance between the straight line L ₀ and the above L ₂ , that is,
Between the rolling radius r _{1 of the} ball 7 with respect to the upper rail 2 side and the distance between the straight line L ₀ and the L ₁ , that is, the rolling radius r ₂ of the ball 7 with respect to the lower rail 3 side, The ratio “r ₁ / r ₂ ” is the ratio “D ₁ / of the outer diameter“ D ₁ ”of the large diameter rolling portion 5 of the roller 4 and the outer diameter“ D ₂ ”of the small diameter rolling portion 6. "D ₂ "
The dimensions are set between the above members.

Further, in this embodiment,
As shown in FIG. 1, the center of the large diameter rolling portion 5 of the roller 4 is substantially on the straight line L ₃ that passes through both the center of the ball 7 and the contact point P _{2 of the} ball 7 on the upper rail 2 side. The relative positions of the contact points P ₁ , P ₂ , P ₃ are set so as to coincide with each other.

In the slide device provided with the slide rail 1 constructed as described above, the vehicle body floor 17
Push-pull operation of the upper rail 2 fixed to the seat 10 (see FIG. 4) side with respect to the lower rail 3 fixed to (see FIG. 4) in the axial direction (that is, the front-back direction of the seat 10). By doing so, the roller 4 that mainly supports the downward pressing load rotates and rolls in the required direction, whereby relative sliding of the upper rail 2 with respect to the lower rail 3 is realized.

Further, in this case, the balls 7, 7 are
Mainly in the horizontal direction and in a direction orthogonal to the sliding direction of the slide rail 1 (that is, in the width direction of the seat 10) and in the upward direction, the load is supported, and in the left-right direction between the lower rail 3 and the upper rail 2. Suppression of rattling,
The upper rail 2 is prevented from separating upward from the lower rail 3.

By the way, in the slide device of this embodiment, as described above, the roller 4 interposed between the upper rail 2 and the lower rail 3 abuts on the lower rail 3 side and rolls. Large-diameter rolling portion 5 and small-diameter rolling portion 6 that abuts the upper rail 2 side to roll.
Therefore, when the roller 4 rotates and the upper rail 2 slides relative to the lower rail 3 relative to the lower rail 3 in the axial direction, the large-diameter rolling portion 5 and the small-diameter rolling portion are formed. Corresponding to the ratio of the outer diameter to the portion 6, the rolling amount of the large diameter rolling portion 5 on the lower rail 3 is twice the rolling amount of the small diameter rolling portion 6 on the upper rail 2. Becomes That is, in FIG. 3B, the lower rail-side movement amount La is twice the upper rail-side movement amount Lb, and the slide stroke “S” in this case is “S = La + L”.
b ”.

This means that, for example, when the slide stroke "S" in the slide rail 1 of the above-mentioned slide device is further increased, the length of the rail on the side where the amount of movement is large (the lower rail 3 side in the case of this embodiment) is long. By increasing the height, it means that it is possible to achieve a long stroke by increasing the slide stroke “S” without increasing the length of the upper rail 2.

Therefore, when the roller 4 is composed of a stepped shaft composed of a large diameter rolling portion 5 and a small diameter rolling portion 6 as in this embodiment, the roller is constituted by a straight shaft as in the conventional case. As compared with the case where the amount of movement of the roller with respect to the upper rail and the amount of movement with respect to the lower rail are the same, the enlargement due to the longer stroke of the slide rail 1 can be suppressed as much as possible. As a result, it is suitable as a slide device particularly applied to a vehicle seat that has a restriction on the arrangement space, and can easily cope with the recent increase in size of the vehicle body, and its practicality is extremely high. Becomes

A slide machine for the slide rail 1
Noh is mainly realized by the operation of the roller 4.
However, when the roller 4 is rotated (that is, a slide operation is performed).
At the time), the above balls 7, 7 are always rotated to perform the required functions.
Is playing. Therefore, the balls 7, 7 roll smoothly.
In case of slipping without movement, this bow
Due to the resistance caused by the sliding of
The slidability (mainly the lightness of operation) of Tool 1 is impaired.
However, in this embodiment,
As described above, the large diameter rolling portion 5 of the roller 4 and the small diameter rolling portion
Outer diameter ratio of part 6 "D₂/ D₁Is the rolling radius of the ball 7.
Ratio "r₂/ R₁The ball 7 is
Rolling following the rolling of the roller 4 and causing slippage
As a result, there is no
The id operation is realized. Furthermore, this implementation
In the slide device of the embodiment, as described above,
Of the ball 7 and the upper rail 2 side of the ball 7
Contact P₂Straight line L passing through and₃Is the large diameter rolling part of the roller 4
5 substantially coincides with the center (in other words, the straight line L ₃To
Since it is inclined), the above-mentioned upper rail 2
Play in the horizontal and vertical directions with respect to the array 3
Effectively prevents sticking and reduces the operating noise of the slide device.
It is possible to reduce.

In this embodiment, the large-diameter rolling portion 5 of the roller 4 rolls on the lower rail 3 side, and the small-diameter rolling portion 6 of the roller 4 rolls on the upper rail 2 side. However, the present invention is not limited to such a configuration. For example, contrary to the above-described embodiment, the small diameter rolling portion 6 of the roller 4 is located on the lower rail 3 side, and the large diameter rolling portion 5 is mounted on the lower rail 3 side. Needless to say, it is also possible to adopt a configuration in which each rolls on the upper rail 2 side.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a slide device according to the present invention.

FIG. 2 is an enlarged view of a ball portion in the slide device shown in FIG.

FIG. 3 is an operation explanatory view of the slide device shown in FIG.

FIG. 4 is a side view of a general vehicle seat.

FIG. 5 is a sectional view of a main part of a conventional slide device.

6 is an operation explanatory view of the slide device shown in FIG.

[Explanation of symbols]

1 is a slide rail, 2 is an upper rail, 3 is a lower rail, 4 is a roller, 5 is a large diameter rolling portion, 6 is a small diameter rolling portion,
7 is a ball, 8 is a bracket, 10 is a seat, 11 is a seat cushion, and 12 is a seat back.

Claims (2)

[Claims] 1. An upper rail (2) fixed to the seat (10) side and a lower rail (3) fixed to the vehicle body floor (17) side are provided by a roller (4) interposed therebetween. A vehicle seat slide including a slide rail (1) which is supported in the up-down direction and in which the upper rail (2) and the lower rail (3) are axially slidable relative to each other by rolling of the roller (4). In the device, the roller (4) is provided with a large diameter rolling portion (5) and a small diameter rolling portion (6) coaxially, and the large diameter rolling portion (5) and the small diameter rolling portion ( A vehicle seat slide device, characterized in that one of the steps 6) is brought into rolling contact with the upper rail (2) side and the other is brought into rolling contact with the lower rail (3) side. 2. The method according to claim 1, Between the upper rail (2) and the lower rail (3)
Located on the upper rail (2) and lower rail
Of the ball (7) rolling with the relative slide of (3)
Rolling radius "r" for the upper rail (2)₁"When
Rolling radius "r" for the lower rail (3)₂Ratio with
"R₁/ R₂Is the large diameter rolling portion of the roller (4).
(5) Diameter "D₁And the diameter of the small diameter rolling part (6)
"D₂Ratio with "D ₁/ D₂, Or the small diameter rolling part
(6) Diameter "D₂] And the diameter of the large diameter rolling part (5)
"D₁Ratio with "D₂/ D₁",
A vehicle seat slide device to collect.