JPH08156658A - Seat sliding device - Google Patents

Abstract

PURPOSE: To provide a seat sliding device easy to assemble with a small number of part items and few manhours by providing each upper rail with a stopper protrusively, and bringing each holder into contact with the stopper. CONSTITUTION: Slide nuts 72, 74 screwed with slide screws 68, 70 are held by nut holders 90, 92, and the lower parts of the nut holders 90, 92 are rigidly fixed to the tip parts of lower rails 2, 2. The end parts, opposed to upper rails 6, 6, of the nut holders 90, 92 are bent frontward and backward, and the frontward bent parts act as transmission contact parts 90a, 92a coming in contact with transmission units 64, 66 so as to regulate the sliding of the upper rails 6, 6. The backward bent parts act as stopper contact parts 90b, 92b coming in contact with stoppers 94, 96 protrusively provided by pressing, for instance, so as to regulate the sliding of the upper rails 6, 6.

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 for sliding a vehicle seat in the front-rear direction.

[0002]

2. Description of the Related Art Generally, in a conventional vehicle seat slide device, one of a pair of rails fitted to each other is fixed to a vehicle body and a seat is placed on the other rail.
A slide screw and a slide nut screwed with the slide screw are attached to the pair of rails. When it is necessary to adjust the position of the seat in the vehicle front-rear direction, the relative position of the pair of rails is changed by rotating either the slide screw or the slide nut with an electric motor to change the screwing position of the two. Is changing.

At the end of the slide screw, a stopper is rotatably held by a nut screwed with the slide screw, and the slide nut comes into contact with the stopper to regulate the sliding of the rail.

In addition, in order to prevent the loosening of the nut, a single spring is sandwiched between two washers, and the washer that abuts on the nut is rotationally restricted, while the other washer is rotatable. Is also proposed (see, for example, Japanese Utility Model Publication No. 4-20661).

[0005]

In the former of those described in the prior art, when the slide nut contacts the stopper, a frictional force is generated between the stopper and the slide nut in the direction of loosening the stopper holding nut. There was a problem that the stopper holding nut would loosen.

In the latter case, the rotation of the slide screw causes biting between the stopper and the end surface of the slide nut, and even if the slide screw is rotated in the reverse direction,
Sometimes it didn't work. Furthermore, it is necessary to sandwich one flat spring between two washers, which increases the number of parts, and it is also necessary to perform predetermined processing on the slide screw and rotation-controlled washer, increasing man-hours and processing cost. There was also the problem of inviting.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a simple seat slide device with a reduced number of parts and man-hours for assembly.

[0008]

In order to achieve the above object, a seat slide device according to the present invention comprises a pair of lower rails extending in the vehicle front-rear direction and fixed to a vehicle body, and a pair of the lower rails fixed to a seat. A bearing shaft having upper rails slidably attached to the lower rails and having both ends fixed to the upper rails,
A pair of transmission units fixed to both ends of the bearing shaft, an electric motor fixed to the substantially central portion of the bearing shaft to drive the transmission unit, and a slide screw extending rearward from the pair of transmission units, While being fixed to the lower rail via a holder, a slide nut screwed with the slide screw and a stopper protrudingly provided on the upper rail are provided, and by bringing the holder into contact with the stopper, the upper rail The feature is that sliding on the lower rail is restricted.

The holder is provided with a front bent portion and a rear bent portion, and the front bent portion is brought into contact with the transmission unit, while the rear bent portion is brought into contact with the stopper, whereby the upper rail is slid with respect to the lower rail. It is good to regulate the movement.

[0010]

[Advantages of the Invention and Effect of the Invention] Since the stopper is provided on the upper rail and the nut holder is brought into contact with the stopper to regulate the sliding, it is necessary to hold the stopper such as a washer on the slide screw with the nut. Therefore, there is no problem that the stopper holding nut is loosened. Further, since the stopper is provided so as to project on the upper rail, almost no frictional force is generated between the stopper and the nut holder, and there is no problem of biting. Furthermore, since only a stopper is required as a separate part, the number of parts is reduced and the labor for processing the slide screw can be saved.

Since sliding can be regulated with a simple structure in which the nut holder is provided with the front bent portion and the rear bent portion, the assembly of the entire apparatus is simplified.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a seat slide device 8 according to the present invention that slides a vehicle seat in the front-rear direction, and FIG. 2 is a perspective view of the seat slide device 8, which is a seat for adjusting the vertical position of the seat. The adjuster unit is also shown.

1 and 2, a pair of spaced lower rails 2 and 2 extending in the vehicle front-rear direction are fixed to a vehicle body through brackets 4 and 4, and upper rails 6 and 6 are seat slide devices. Lower rail 2, 2 by 8
It is slidably attached to.

An electric motor 62, which is a drive source of the seat slide device 8, is arranged in front of the seat adjuster unit, is connected to the motor 62, and is a slide transmission unit 64, 66, and a slide screw extending rearward from the unit 64, 66. 68, 70 and slide nuts 72, 74 screwed onto the slide screws 68, 70 are arranged close to the lower rail 2 and the upper rail 6, and are configured not to interfere with the seat adjuster unit.

In the following, the above construction will be described in detail. Both ends of the bearing shaft 76 are fixed to the forward projecting ends of the upper rails 6 and 6, and the transmission units 64 and 66 are fitted to the brackets 78 and 80 at both ends of the bearing shaft 76. Is fixed through. The motor 62 is fixed to a substantially central portion of the bearing shaft 76 via a bracket 82.

As shown in FIG. 3, the bearing shaft 76
Inside the brackets 78, 80 of the notch 76a, 7
6a is formed, and the brackets 7 are formed by fitting the retaining rings 88, 88 into the notches 76a, 76a.
8 and 80 are fixed respectively, and the movement of the transmission units 64 and 66 in the axial direction is restricted (only one side is shown in FIG. 3).

A pair of drive shafts 84 and 86 extending from the left and right ends of the motor 62 in parallel with the bearing shaft 76 are connected to the transmission units 64 and 66, respectively, and are adjacent to the upper rails 6 and 6, respectively. Slide screws 68 and 70 extend rearward of 64 and 66.

As shown in FIG. 4, a slide nut 72 screwed with a slide screw 68, 70,
74 is a nut holder 90, 9 whose horizontal cross section is substantially "U" shaped.
2, the lower portions of the nut holders 90 and 92 are fixed to the tips of the lower rails 2 and 2. Both end portions of the nut holders 90 and 92 facing the upper rails 6 and 6 are bent forward and backward, and the front bent portions contact the transmission units 64 and 66 to regulate the sliding of the upper rails 6 and 6. While acting as transmission contact portions 90a and 92a to be performed, the rear bent portion is
Near the rear ends of the slide screws 68 and 70, the stopper rails 6 and 6 are brought into contact with the inner surfaces of the upper rails 6 and 6, for example, and are brought into contact with stoppers 94 and 96 that are convexly formed by press molding to regulate the sliding of the upper rails 6 and 6. Contact parts 90b, 9
Acts as 2b.

The operation of the seat slide device according to the present invention having the above structure will be described below. When it is necessary to adjust the position of the seat in the vehicle front-rear direction, when the motor 62 is operated by pressing a switch (not shown), the motor is driven via the drive shafts 84 and 86 and the transmission units 64 and 66. The rotational force of 62 is transmitted to the slide screws 68 and 70, and the slide screw 6
8,70 rotate. Slide screw 68,70
Is a slide nut 7 fixed to the lower rails 2, 2.
2, 74 are screwed together, the slide screws 68, 70 move integrally with the upper rails 6, 6 along the lower rails 2, 2 in the vehicle front-rear direction, and the motor 6
The sheet is held at the position where 2 is stopped.

When the motor 62 continues to rotate, the nut holders 90, 92 have transmission contact portions 90a, 92.
a or the stopper abutting portions 90b, 92b, the transmission units 64, 66 or the stoppers 94,
96 and the lower rails 2 of the upper rails 6 and 6
The sliding regulation for 2 is performed.

The seat adjuster unit arranged at the rear of the seat slide device according to the present invention has a front connecting shaft 10 and a rear connecting shaft 12 whose both ends are rotatably supported by the upper rails 6 and 6 in parallel with each other. And has the following configuration.

At the positions slightly separated from the upper rails 6 and 6 near the right and left ends of the front connecting shaft 10, the base end of the lever 14 and the substantially central part of the lever 16 longer than the lever 14 are respectively provided. It is fixed and lever 1
Seat brackets 18 and 20 hung from the lower surface of the front part of the seat are pivotally attached to the tips of the seats 4 and 16, respectively. Further, a shaft bracket 22 is fixed to the front connecting shaft 10 in parallel with the lever 16 at a predetermined interval, and the lever 16 and the shaft bracket 22 are attached.
A nut 24 is rotatably supported on the. Further, the nut 24 is projected inward from the shaft bracket 22, and a rotation stopper 26 is fixed to the projecting end.

Similarly, at the positions slightly separated from the upper rails 6 and 6 near the left and right ends of the rear connecting shaft 12, the base end of the lever 28 and the substantially central portion of the lever 30 longer than the lever 28 are provided. Are fixed to each other, and the rear lower surface of the seat is pivotally attached to the tip ends of the levers 28 and 30. A shaft bracket 36 is further fixed to the rear connecting shaft 12 in parallel with the lever 30 at a predetermined interval, and the lever 30 and the shaft bracket 36 are attached.
A nut 38 is rotatably supported on the. Further, the nut 38 is projected inward from the shaft bracket 36, and the rotation stopper 40 is fixed to the protruding end thereof.

An intermediate shaft 42 extends between the front connecting shaft 10 and the rear connecting shaft 12 substantially parallel to the shafts 10 and 12.
Both ends of 2 are fixed to upper rails 6 and 6. A front transmission unit 44 is rotatably supported at a position slightly separated from the upper rail 6 near the left end of the intermediate shaft 42, and a slide screw 46 extending forward from the transmission unit 44 is attached to the nut 24. It is screwed together. Similarly, in the vicinity of the right end of the intermediate shaft 42, at a position slightly separated from the upper rail 6, the rear transmission unit 4 is provided.
8 is rotatably supported, and a slide screw 50 extending rearward from the transmission unit 48.
Is screwed into the nut 38.

At the left end of the front transmission unit 44 and at the right end of the rear transmission unit 48, a holding ring 47 called a so-called E-ring,
51 is fitted and fixed to the intermediate shaft 42, and prevents the corresponding transmission units 44 and 48 from moving in the axial direction.

Before and after the substantially central portion of the intermediate shaft 42,
A pair of electric motors 52, 54 are supported via a common motor bracket 56 fixed to the intermediate shaft 42, and the front and rear transmission units 44, 48 separated from the electric motors 52, 54 include the electric motor 5
2, 54 are respectively connected via flexible members 58, 60 such as wires or cables.

The transmission units 64 and 66 of the seat slide device and the transmission units 44 and 48 of the seat adjuster unit described above are
It is possible to share a worm and a worm wheel that mesh with each other and to share a transmission unit.

[Brief description of drawings]

FIG. 1 is a plan view of a seat slide device according to the present invention and a seat adjuster unit arranged behind the device.

FIG. 2 is a perspective view of the seat slide device and the seat adjuster unit of FIG.

FIG. 3 is an exploded perspective view showing a fitted state of a bearing shaft and a holding ring.

4 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 2 Lower rail 6 Upper rail 8 Seat slide device 62 Electric motor 64,66 Slide transmission unit 68,70 Slide screw 72,74 Slide nut 76 Bearing shaft 90,92 Nut holder 90a, 90b, 92a, 92b Abutting part 94, 96 Stopper

Claims (2)

[Claims] 1. A seat slide device having a pair of lower rails extending in a vehicle front-rear direction and fixed to a vehicle body, and an upper rail fixed to a seat and slidably attached to the pair of lower rails, respectively. A bearing shaft having both ends fixed to a rail, a pair of transmission units fixed to both ends of the bearing shaft, an electric motor fixed to a substantially central portion of the bearing shaft to drive the transmission unit, and the pair of transmission units. A slide screw extending rearward from the transmission unit, fixed to the lower rail via a holder, and provided with a slide nut screwed with the slide screw, and a stopper projectingly provided on the upper rail,
A seat slide device characterized in that sliding of the upper rail with respect to the lower rail is regulated by bringing the holder into contact with the stopper. 2. The holder has a front bent portion and a rear bent portion, and the front bent portion is brought into contact with the transmission unit while the rear bent portion is brought into contact with the stopper. The seat slide device according to claim 1, wherein sliding of the upper rail with respect to the lower rail is restricted.