JP2002192996A - Power seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power seat capable of miniaturizing and reducing cost. SOLUTION: Two washers 143, 147 (a projecting part extending in the radial direction) are installed in a screw shaft 107, and a recess 201 projecting toward the washers 143, 147, and capable of contacting with the washers 143, 147 through a minute distance is integratedly formed in the upper rail 105.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lower rail provided on a floor side, an upper rail provided on a seat side and movably engaged with the lower rail, and provided on one of the lower rail and the upper rail. A gear box that converts and outputs an input from a motor, the lower rail, a nut member provided on the other rail of the upper rail, and one end side is attached to an output side of the gear box, and an intermediate part is provided. A power shaft having a screw shaft screwed to the nut member, wherein the upper rail moves along the lower rail by rotation of the screw shaft.

[0002]

2. Description of the Related Art First, an overall configuration of a conventional power seat will be described with reference to FIG.

In the figure, brackets 1 and 3 are provided on the floor side.
An upper rail 9 provided on the side of the seat cushion 7 of the seat is movably engaged with the lower rail 5 attached through the lower rail 5.

At the front of the upper rail 9, a gear box fixing bracket 15 comprising two brackets 11, 13 is provided.
, A gear box 17 is provided. next,
The driving mechanism of the power seat shown in FIG. 7 will be described with reference to FIGS. 8 is an exploded perspective view showing a main part of the drive mechanism, and FIG. 9 is a sectional view of the mechanism shown in FIG.

As shown in FIG. 8, a gear box fixing bracket 15 is attached to the upper rail 9 and a bracket 13 for abutting one end surface of the gear box 17 on the bracket 13.
And the gear box 17
And the bracket 11 which abuts the other end face of the gear box 17 and cooperates with the bracket 13 to clamp the gear box 17.

The bracket 11 and the gear box 1
7 and three bolts 19 for screwing into bracket 13
The gear box 17 is attached. The input shaft 21 of the gear box 17 is driven by a motor (not shown) provided on the seat cushion side.

As shown in FIG. 9, a worm 23 is attached to the input shaft 21 inside the gear box 17. Further, a worm wheel 25 screwed to the worm 23 is rotatably provided inside the gear box 17. At the rotation center of the worm wheel 25, a hole 25a having a serration formed on the inner peripheral surface is formed.

On the other hand, a nut bracket 35 for holding a nut member 33 with a bolt 31 is attached to the lower rail 5. An intermediate portion of the screw shaft 37 is screwed to the nut member 33.

On one end side (gear box 17 side) of the screw shaft 37, a serration portion 37a having a serration formed on the peripheral surface, and a male screw portion having a screw formed on the peripheral surface. 37b is formed, one end of which is inserted through the hole 25a of the worm wheel 25 in the gear box 17, the serration 37a is engaged with the hole 25a of the worm wheel 25, and the male screw portion protruding from the gear box 17 is formed. A nut 39 is screwed into 37b.

The engagement between the serrated hole 25a of the worm wheel 25 and the serrated portion 37a of the screw shaft 37 causes the worm wheel 25 to engage.
Is transmitted to the screw shaft 37.

The operation of the above configuration will be described. When the worm 23 in the gear box 17 is rotationally driven by a motor (not shown), the worm wheel 25 screwed to the worm 23 rotates.

The worm 23 and the worm wheel 25
As a result, the rotation of the motor is decelerated, the direction of the rotation axis of the motor is changed, and the screw shaft 37 rotates.

Since the nut member 33 attached to the lower rail 5 attached to the floor is screwed to the screw shaft 37, the screw shaft 37 is provided and movably engaged with the lower rail 5. The upper rail 9 moves, and the sheet moves.

[0014]

However, in the power seat having the above structure, the load acting on the seat is transmitted to the lower rail 5 through the upper rail 9 at the time of collision or acceleration / deceleration of the vehicle.

More specifically, the load applied to the seat is transferred from the upper rail 9 to the lower rail 5 via the gear box fixing bracket 15, the gear box 17, the screw shaft 37, and the nut member 33 attached to the front of the upper rail 9. Is transmitted.

In order to prevent the upper rail 9 (seat) from moving even when a large load acts on the seat such as at the time of a vehicle collision, the gear box fixing bracket 15 attached to the front portion of the upper rail 9 is used. Gear box 1
It is important to ensure sufficient strength of the screw shaft 37, the nut member 33, and the nut bracket 35.

In particular, it is necessary to sufficiently secure the strength of the gear box fixing bracket 15 and the gear box 17 where the load is concentrated. Therefore, the gear box fixing bracket 15 and the gear box 17 need to be made of a material or a structure that can withstand an applied load, and there is a problem that the size and cost of the power seat are increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power seat that can be reduced in size and cost.

[0019]

According to a first aspect of the present invention, a lower rail provided on a floor side, an upper rail provided on a seat side and movably engaged with the lower rail, and the lower rail are provided. A gear box provided on one of the upper rails for converting and outputting an input from a motor; a lower rail, a nut member provided on the other one of the upper rails; A screw shaft attached to the output side of the box, the intermediate portion having a screw shaft screwed to the nut member, wherein the upper rail is moved along the lower rail by rotation of the screw shaft, the power seat, The shaft is provided with a protrusion extending in the radial direction, and protrudes toward the protrusion. In the direction of movement of Pareru a power seat, characterized in that integrally formed abutment recess capable via a small gap to the rail towards which the gearbox is provided for the projection.

The screw shaft is provided with a protrusion extending in a radial direction, and has a recess protruding toward the protrusion and capable of contacting the protrusion with a small distance in the moving direction of the upper rail. When a load is applied to the seat because the gear box is formed integrally with the rail on which the gear box is provided, the load is transmitted to the lower rail via the following path.

When the Gear Box is Provided on the Upper Rail and the Nut Member is Provided on the Lower Rail The load is transmitted to the lower rail via the upper rail, the recess, the protrusion of the screw shaft, the screw shaft, and the nut member.

When the gearbox is provided on the lower rail and the nut member is provided on the upper rail The load is transmitted to the lower rail via the upper rail, the nut member, the screw shaft, the protrusion of the screw shaft, and the concave portion.

Since the load can be transmitted to the lower rail without the intermediary of the weak gear box and the bracket for supporting the gear box, the gear box and the bracket for supporting the gear box are not increased in size, and the cost can be reduced.

Further, since the recess is formed integrally with the upper rail or the lower rail, the cost can be reduced. According to a second aspect of the present invention, in the first aspect of the invention, the protrusion is two washers fixed to the screw shaft at an interval, and the recess is formed between the two washers. It is a power seat characterized by being performed.

Even if a forward load and a backward load act on the seat, the load can be transmitted to the screw shaft via the washer in one recess. According to a third aspect of the present invention, in the first aspect of the present invention, the protrusion is a washer fixed to the screw shaft, and the recess is two recesses formed so as to sandwich the washer. A power seat characterized in that:

Even if a forward load or a backward load acts on the seat, the load can be transmitted to the screw shaft by the washer, which is a single protrusion. According to a fourth aspect of the present invention, the protrusion according to the first aspect of the invention is fixed to a front portion and a rear portion of the screw shaft, and abuts on the nut member to regulate a sliding amount of the upper rail. The power seat according to any one of claims 1 to 4, wherein the recesses are two recesses that can contact the two washers from different directions.

The protrusion is fixed to the front and rear portions of the screw shaft, and comes into contact with the nut member to form two washers for restricting the slide amount of the upper rail. Since there is no need to separately provide a stopper for regulating, the cost can be reduced.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. It should be noted that the slide sheet of the present embodiment is different from the slide sheet described in the conventional example only in the mechanism for transmitting the load applied to the sheet to the lower rail, and the other parts have the same mechanism. The different parts will be described in detail, and the description of the same mechanism as in the conventional example will be omitted.

(First Embodiment) First, the overall configuration will be described with reference to FIG. 1 which is a perspective view of a main part of the first embodiment.

The gear box 101 is mounted on an upper rail 105 via a gear box fixing bracket 103. On one end side (gear box 101 side) of the screw shaft 107, a small-diameter portion 107a smaller in diameter than the main body portion 107e having a spiral groove formed in the peripheral surface.
Are formed.

The small-diameter portion 107a has three portions, that is, a male thread portion 1 having a thread engraved on the peripheral surface from the distal end side.
07b, a serrated portion 107c having serrations engraved on the peripheral surface, and a cylindrical portion 107d having nothing formed on the peripheral surface.

Next, a description will be given with reference to FIG. 2, which is a view showing a cross section near the gear box of FIG. A worm 123 is attached to the input shaft 121 of the gear box 101 driven by a motor (not shown) provided on the seat cushion side.

Further, inside the gear box 101,
A worm wheel 125 screwed to the worm 123 is rotatably provided. This worm wheel 125
A hole 125a having a serration formed on the inner peripheral surface is formed at the center of rotation of.

Then, the small diameter portion 107a on one end side of the screw shaft 107 is inserted through the hole 125a of the worm wheel 125 in the gear box 101, and the small diameter portion 1
07a serration 107c is the worm wheel 1
A nut 139 is screwed into a male screw portion 107b which is engaged with the 25 hole 125a and protrudes from the gear box 101.

On the other hand, a washer 143 abutting on a wall surface at the boundary between the small diameter portion 107a and the main body 107e is provided on the cylindrical portion 107d of the small diameter portion 107a of the screw shaft 107.
Collar 145 with one end face abutting washer 143
And a washer 14 that contacts the other end surface of the collar 145.
7 are provided.

Further, the washer 147 is connected to the cylindrical portion 107d.
The washer 143, washer 147
Are fixed to the screw shaft 147 at intervals.

Here, the washer 143 and the washer 14
7 is a 2 extending in the radial direction of the screw shaft 107;
The collar 145 functions to maintain a space between the two washers 143 and 147.

As shown in FIG. 1, the side surface of the upper rail 105 projects toward the washers 143 and 147, and the washer 1 moves in the moving direction of the upper rail 105.
A concave portion 201 that can abut against a small distance 43, 147 is formed integrally.

More specifically, as shown in FIG. 4, which is an enlarged view of the portion B in FIG. 1, two vertical cuts 203 are provided on the side surface of the upper rail 105, and plastic processing is performed between the cuts 203. A recess 201 is formed.

As shown in FIG. 3, which is a cross-sectional view taken along the line AA in FIG. 2, the wall surface 201a of the concave portion 201 can be brought into contact with the washer 147 at a small interval. .

Similarly, the wall surface 201b of the concave portion 201 can contact the washer 143 at a small interval. The operation of the above configuration will be described. When the worm 123 in the gear box 101 is driven to rotate by a motor (not shown), the worm wheel 125 screwed to the worm 123 rotates.

The worm 123 and the worm wheel 1
25, the rotation of the motor is reduced, and the direction of the rotation axis of the motor is changed.
Rotates.

Since the nut member attached to the lower rail attached to the floor side is screwed to the screw shaft 107, the screw shaft 107 is provided, and the upper rail 105 movably engaged with the lower rail is provided. Then, the sheet is moved.

According to the above configuration, the screw shaft 1
07, two washers 143 and 147 are fixed at intervals, and in the direction of movement of the upper rail 105, the washers 14
By forming the concave portion 201 having the wall surfaces 201a and 201b, which can be in contact with the small rails 3 and 147 at a small interval, integrally with the upper rail 105, when a load is applied to the seat, the load is reduced to the upper rail 105 and the upper rail. The power is transmitted to the screw shaft 107 via the recess 201 of the 105, the washer 143 or the washer 147 of the screw shaft 107, and further transmitted to the lower rail via a nut member.

Since the load acting on the seat can be transmitted to the lower rail without passing through the low-strength gear box 101 and the gear box fixing bracket 103 supporting the gear box, the gear box 101 and the gear box fixing bracket 103 can be enlarged. Cost can be reduced.

Further, the concave portion 201 of the upper rail 105
Is formed integrally with the upper rail 105, so that the cost can be reduced. Further, even if a forward load or a backward load acts on the seat, the load can be transmitted to the screw shaft 107 via the washer 143 or the washer 147 in one recess 201.

(Second Embodiment) A description will be given with reference to FIG. 5 showing a main part of a second embodiment. In the figure, one washer 301 is fixed to the screw shaft 300 as a projection.

On the other hand, the upper rail 303 is formed so as to sandwich the washer 301, and the wall surfaces 201a, 201b which can be brought into contact with the washer 301 at a small interval.
Are formed.

The method of forming these recesses 305 and 307 is as follows.
This is the same as the recess 201 in the first embodiment. According to the above configuration, when a load acts on the seat, the load is transmitted to the screw shaft 300 via the upper rail 303, the wall surface 305 a of the recess 305 or the wall surface 307 a of the recess 307 of the upper rail 303, and the washer 301 of the screw shaft 300. .

Since the load applied to the seat can be transmitted to the lower rail without passing through the low-strength gear box and the gear box fixing bracket supporting the gear box, the gear box and the gear box fixing bracket do not increase in size.
Cost reduction can be achieved.

Also, the recess 305 of the upper rail 303,
307 is formed integrally with the upper rail 303, so that the cost can be reduced. Further, even if a forward load and a backward load act on the seat, the load can be transmitted to the screw shaft 300 by one washer 301.

(Third Embodiment) A description will be given with reference to FIG. 6, which is a diagram showing a main part of a third embodiment. In the figure, a screw shaft 405 that is rotationally driven via a gear box 403 is provided on an upper rail 401.

The lower rail 411 has a bracket 413
A nut member 415 is provided through the nut, and a screw shaft 405 is screwed to the nut member 415. A washer 407 and a washer 409 as projections are fixed to the front and rear portions of the screw shaft 405, and are brought into contact with the nut member 415, so that the upper rail 401 is provided.
The slide amount is regulated.

The upper rail 401 is formed with two concave portions 431 and 433 which can be brought into contact with the two washers 407 and 409 from different directions at a small interval.

The method of forming these concave portions 431 and 433 is as follows.
This is the same as the recess 201 in the first embodiment. In the present embodiment, the wall surface 431a of the recess 431 can contact the washer 407 from the retreating direction of the sheet.
The wall surface 433a of the 33 can be contacted from the forward direction of the sheet.

According to the above configuration, when a load acts on the seat, the load is applied to the upper rail 401 and the upper rail 40.
The wall 431a of the first recess 431 or the wall 433a of the recess 433 and the washer 407 of the screw shaft 405
Or screw shaft 40 through washer 409
5 is transmitted.

Since the load applied to the seat can be transmitted to the lower rail without the intervention of the low-strength gear box and the gear box fixing bracket supporting the gear box, the gear box and the gear box fixing bracket do not increase in size.
Cost reduction can be achieved.

Also, the recesses 431,
433 is formed integrally with the upper rail 401, so that the cost can be reduced. Further, the washer 40
7. The washer 409 eliminates the need to separately provide a stopper for restricting the amount of sliding of the upper rail 401, thereby reducing costs.

The present invention is not limited to the above three embodiments. In the above three embodiments,
Although the washer was used as the projection provided on the screw shaft, the projection may be formed integrally with the screw shaft.

In the above three embodiments, the gear box is provided on the upper rail, the nut member is provided on the lower rail, and the recess is formed on the upper rail. Conversely, the gear box is provided on the lower rail, and the nut member is provided on the lower rail. Is provided on the upper rail, and the power seat in which the concave portion is formed on the lower rail is also applicable.

[0061]

As described above, according to the first aspect of the present invention, the load can be transmitted to the lower rail without the intervention of the low-strength gear box and the bracket for supporting the gear box. The size of the bracket for supporting is not increased, and the cost can be reduced.

Further, since the recess is formed integrally with the upper rail or the lower rail, the cost can be reduced. According to the second aspect of the present invention, even if a forward load and a rearward load act on the seat, the load can be transmitted to the screw shaft via the washer in one concave portion.

According to the third aspect of the present invention, even if a forward load and a rearward load act on the seat, the load can be transmitted to the screw shaft by the washer, which is one projection.

According to the fourth aspect of the present invention, the protrusion is fixed to a front part and a rear part of the screw shaft,
By contacting the nut member, two washers are provided to regulate the sliding amount of the upper rail, so that there is no need to separately provide a stopper for regulating the sliding amount of the upper rail, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a first embodiment.

FIG. 2 is a view showing a cross section near the gear box of FIG. 1;

FIG. 3 is a sectional view taken along section line AA in FIG. 2;

FIG. 4 is an enlarged view of a portion B in FIG. 1;

FIG. 5 is a diagram showing a main part of a second embodiment.

FIG. 6 is a diagram showing a main part of a third embodiment.

FIG. 7 is a view showing the appearance of a conventional power seat.

8 is an exploded perspective view showing a main part of the drive mechanism of FIG.

FIG. 9 is a sectional view of the mechanism shown in FIG. 8;

[Explanation of symbols]

 101 Gear Box 105 Upper Rail 107 Screw Shaft 143,147 Washer (Protrusion) 201 Concave

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Tanaka 2nd Kiririhara-cho, Fujisawa-shi, Kanagawa Prefecture Shiroki Industry Co., Ltd. F-term (reference) 3B087 AA02 BA02 BB02

Claims (4)

[Claims] A lower rail provided on a floor side; an upper rail provided on a seat side and movably engaged with the lower rail; an input provided from one of the lower rail and the upper rail; A gear box that converts and outputs a signal, a nut member provided on the other rail of the lower rail and the upper rail, and one end side is attached to an output side of the gear box;
A screw shaft having an intermediate portion screwed to the nut member; and a power seat in which the upper rail moves along the lower rail by rotation of the screw shaft, wherein the protrusion extends radially from the screw shaft. A concave portion that protrudes toward the projection and that can contact with the projection at a small interval in the moving direction of the upper rail with the rail on which the gear box is provided. A power sheet characterized in that the power sheet is formed in a power sheet. 2. The device according to claim 1, wherein the protrusion is two washers fixed to the screw shaft at an interval, and the recess is formed between the two washers. The described power seat. 3. The projection according to claim 1, wherein the protrusion is a washer fixed to the screw shaft, and the recess is two recesses formed so as to sandwich the washer. Power seat. 4. The projection is fixed to a front part and a rear part of the screw shaft, and is a pair of washers for restricting an amount of sliding of an upper rail by contacting the nut member. 2. The power seat according to claim 1, wherein there are two concave portions that can be abutted on the two washers from different directions.