JPH033070Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a power slide device used for a vehicle seat such as a passenger car, and particularly relates to a power slide device having a curved rail.

<<Prior Art>> Power slide devices are used in vehicles such as passenger cars to move seats back and forth using electric power or other power. In this power slide device, an upper rail attached to a seat frame is slidably placed on a lower rail fixed to a vehicle floor, and the upper rail is moved by electric power or the like to slide the seat. The general mechanism for moving this upper rail is a support bracket that is swingably supported by a mounting bracket fixed to the lower rail, a screw shaft that is fixed to this support bracket and extends back and forth, and a screw shaft that is fixed to the upper rail. The screw shaft is equipped with a gear box that is swingably supported by a mounting bracket provided with the gear box, and a screw nut that is housed within the gear box and is screwed onto the screw shaft. When the upper rail is rotated, the upper rail moves in the front and back direction with respect to the screw shaft. FIG. 4 shows an example of such a conventional power slide device. In the figure, a indicates a lower rail, and b indicates an upper rail. c is a mounting bracket fixed to the lower rail a, d is a support bracket supported swingably around a horizontal pin (not shown) on the mounting bracket c, and fixedly supports the screw shaft e extending in the front-rear direction. ing. On the other hand, a mounting bracket f is fixed to the upper rail b, and a support bracket h to which a gearbox g is fixed is attached.
is supported by a mounting bracket f so as to be able to swing around a horizontal pin i at one location. Gearbox G has a screw nut housed inside it,
This screw nut is screwed onto the screw shaft e. Although the internal mechanism of this gearbox g is not particularly shown, for example,
In a known mechanism as shown in the above publication, the screw nut is rotated by a drive motor j by a speed reduction means such as a worm. Then, since the screw nut is screwed into the screw shaft e, it moves in the front-back direction with respect to the screw shaft e, and therefore with respect to the support bracket d, the mounting bracket c, and the lower rail a, and therefore the support bracket h, the mounting bracket f and the upper rail b move back and forth.

In the above conventional example, the screw shaft e is connected to the lower rail a, and the screw nut screwed thereto is connected to the upper rail b.
, each is supported so that it can swing around a horizontal axis, so even if the rail is curved in the vertical direction, there is no problem in the upper rail b swinging smoothly on the lower rail a. . A sliding seat having such a curved rail can adjust the inclination of the seat at the same time as sliding it back and forth, and has recently been used more frequently than a sliding seat having a straight rail.

[Problems to be solved by the invention] However, in the conventional power slide device as described above, the screw nut attached to the upper rail is driven and rotated by a motor to move back and forth, so it is difficult to move forward and backward. In order to achieve the designed seat layout, the drive motor must be placed at the bottom center of the seat in the longitudinal direction. This is because if the drive motor is placed in a position closer to one side, it will only be able to move slightly in that direction. Therefore, since the motor is located at the part where the most weight is applied by the seated occupant, the seat cushion performance will deteriorate unless there is a large clearance from the seat to the motor, so the thickness of the seat cushion must be made thicker. . This increases the space inside the vehicle, increases the cost, and impairs the comfort of the vehicle as a passenger vehicle.

The purpose of this invention is to provide an improved power slide device that eliminates the above-mentioned problems of the conventional power slide device and allows the curved rail to operate smoothly without requiring extra space. shall be.

<Means for Solving the Problems> The power slide device according to this invention includes: a lower rail that curves downward in a convex manner; an upper rail that is curved in the same way as the lower rail and is slidably assembled to the lower rail; a mounting bracket for fixing the lower rail to the vehicle body; a support bracket formed in a downwardly open U-shape and swingably supported by the mounting bracket by pins inserted through both sides thereof; a gearbox fixed on a support bracket; a screw shaft connected to the gearbox and disposed parallel to the rail; a motor for rotationally driving the screwshaft via the gearbox; The screw nut is rotatably supported via a support bracket by a mounting bracket that is screwed to the shaft and fixed to the upper shaft.

<<Operation>> The screw shaft rotates by rotating the motor, and the screw nut fixed to the upper rail moves via the bracket, so the upper rail moves in the front-rear direction of the seat relative to the lower rail. The vertical movement of the upper rail due to the arcuate motion is absorbed by supporting the respective brackets supporting the drive unit and the screw nut in a swingable manner relative to the respective mounting brackets of the lower rail and the upper rail.

<<Example>> FIG. 1 shows an example of this invention. The upper rail 1, which is gently curved in a downward convex manner, is swingably assembled to the lower rail 2, which is also curved, via rollers and balls. Two such rail assemblies are arranged parallel to each other in the longitudinal direction of the automobile floor.
A seat (not shown) is fixed onto the upper rail 1 via installation bolts 3. lower rail 2
At the bottom of both ends are mounting brackets 4 and 5, respectively.
are welded and attached to the vehicle floor side with bolts through the mounting holes 4a and 5a. Lower rail mounting portion 4b of one mounting bracket 4
is formed in a U-shape that is open downward, and holes for inserting the pins 6 are formed on both sides thereof. A U-shaped support bracket 7, which is similarly opened downward and has holes formed on both sides for inserting pins 6, is disposed on the outside of one side of the mounting portion 4b, and is connected to the mounting bracket 4 and the support bracket 7. As shown in FIG. 2, the bracket 7 is coupled to the bracket 7 so as to be able to swing around the pin 6 by inserting the headed pin 6 into both holes and securing it with an E-ring 8.

A gearbox 10 connected to a drive motor 9 and having a built-in speed reduction mechanism is fixed onto the support bracket 7 by bolts 11. gearbox 10
Inside, rotational force is transmitted to the screw shaft 12 by a worm fixed to the rotating shaft of the drive motor 9 and a worm wheel meshing with the worm.

On the other hand, on the upper surface of the middle part of the upper rail 1, there is an L
One side of the L-shaped mounting bracket 13 is welded and the other side has a downward L-shaped support bracket 1.
As shown in FIG.
5, it is swingably attached. A screw nut 17 is fixed to this support bracket 14 with a bolt 16.
A screw shaft 12 is screwed to 7.

Next, the operation of this device will be explained. When the drive motor 9 is energized and its rotational driving force is transmitted to the screw shaft 12 via the gearbox 10, the screw nut 17 moves in the axial direction of the screw shaft 12. The movement of the screw nut 17 is transmitted to the upper rail 1 via the support bracket 14 and the mounting bracket 13, and the upper rail 1 swings relative to the lower rail 2. Since the seat is fixed on top of the upper rail 1, the position of the seat can be adjusted back and forth.

The seat moves forward or backward by changing the direction of the current flowing through the drive motor 9. Since both rails 1 and 2 are formed in an arc shape, when the upper rail 1 moves relative to the lower rail 2, its mounting portion 13 moves up and down according to the amount of movement. This vertical movement is performed by gearbox 1.
The bracket 7 supporting the screw nut 17 and the bracket 14 supporting the screw nut 17 are both swingably supported by the mounting brackets 4 and 13 by the pins 6 and 15, thereby absorbing the problem.

<<Effects of the invention>> As described above, the power slide device for a vehicle seat according to this invention has a screw shaft that extends and rotates in the longitudinal direction from a gearbox that is swingably supported on a lower rail and is swingably supported on an upper rail. This mechanism slides the upper rail onto the lower rail and slides the seat. Therefore, even in seat power slide devices using curved rails, the drive motor and gearbox are connected to the front end of the seat or By placing it at the rear end, the seat can be smoothly swung along the curved rail.
In this way, the drive motor can be installed at the front and rear ends, where the load is smaller and the displacement is smaller than in the center, so there is no need to take up extra interior space, there is no need to thicken the cushion pads, and the cost of the vehicle is reduced. It is possible to reduce the amount of heat generated and improve the interior comfort of the vehicle. Furthermore, the support bracket that supports the drive motor and gearbox is formed in a downwardly open U-shape, and pins for swingably supporting the mounting bracket are inserted through both sides of the mounting bracket, increasing strength. As a result, the motor part is supported more reliably, and the driving force is transmitted smoothly.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a power slide device showing an embodiment of this invention, Fig. 2 is a sectional view of the motor mounting part of Fig. 1, and Fig. 3 is a sectional view of the screw nut mounting part of Fig. 1. 4 are perspective views of essential parts showing an example of a conventional power slide device. 1...Top rail, 2...Lower rail,
4, 5, 13...Mounting bracket, 7, 14...
Support bracket, 6, 15...pin, 9...drive motor, 10...gearbox, 12...screw shaft, 17...screw nut.

Claims (1)

[Scope of utility model registration request] A lower rail that curves convexly downward,
an upper rail that is curved in the same manner as the lower rail and slidably assembled to the lower rail; a mounting bracket for fixing the lower rail to the vehicle body; and an upper rail that is formed in a downwardly open U-shape and that is inserted into both sides of the upper rail. a support bracket that is swingably supported on the mounting bracket by a pin attached thereto; a gearbox fixed on the support bracket; a screw shaft connected to the gearbox and disposed parallel to the rail; a motor for rotationally driving the screw shaft via the gear box; and a screw screw shaft that is screwed to the screw shaft and is swingably supported via a support bracket to a mounting bracket that is fixed to the upper shaft. A power slide device equipped with a nut.