JP3131394B2 - Power slide device for automotive seats - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power slide device for a vehicle seat.

[0002]

2. Description of the Related Art There is known a power slide device for sliding an automobile seat back and forth by an electric motor (for example, see Japanese Utility Model Laid-Open No. 1-99734).

In general, this type of power slide device includes a movable rail (upper rail) fixed to a seat.
Alternatively, one of the fixed rails (lower rails) fixed to the floor is provided with a long screw shaft along the longitudinal direction, and the other is provided with a nut portion to be screwed to the screw shaft, and either the screw shaft or the nut portion is provided. Is rotated by an electric motor, so that the movable rail (seat) is slid in the front-rear direction with respect to the fixed rail.

The maximum sliding amount of the sheet is determined by the length of the screw shaft. Therefore, in order to increase the maximum sliding amount of the seat, it is necessary to employ a longer screw shaft.

[0005]

However, in such a conventional technique, it is necessary to provide a long screw shaft on a movable rail or a fixed rail, so that it is difficult to assemble the screw shaft.

That is, if the screw shaft is not completely parallel to the movable rails or the like, the screwed state with the nut portion is adversely affected, so that the parallel adjusting operation of the screw shaft takes time, and the assembling operation takes time. It is very difficult.

On the other hand, if the screw shaft is too long, the screw shaft tends to bend on the way, which is disadvantageous in making the seat longer.

The present invention has been made by paying attention to such a conventional technique, and provides a power slide apparatus for an automobile seat in which the assembling work is simple and the seat can be easily lengthened.

[0009]

According to the first aspect of the present invention,
A pair of left and right fixed rails fixed to the floor and a pair of left and right movable rails fixed to the seat are respectively slidably combined in a longitudinal direction, and the fixed rail is integrally provided with a nut portion along a longitudinal direction. the predetermined length of the gear unit to the nut portion meshing of the fixed rail is provided, is meshed a first screw gear that rotates with orthogonal axis relative to the longitudinal direction of the gear unit, forming internal teeth on the first screw gear, The rotational force of the motor is transmitted to the internal teeth from a drive gear that rotates on an orthogonal axis.

According to the first aspect of the present invention, since the fixed rail is integrally provided with the nut portion extending along the longitudinal direction, the nut portion is inevitably completely parallel to the fixed rail. Is easy.

[0011] Further, in order to make the seat longer, it is necessary to keep the predetermined length of the gear unit unchanged.
It can be easily realized only by extending the length of the nut portion.

Further, since the gear unit and the nut are meshed with each other, the number of teeth meshing with each other is larger than that of a simple spur gear, and the stopper function for preventing the seat from moving back and forth when the motor is stopped is high.

Further, since the internal gear is formed on the first screw gear, and the rotational force of the motor is transmitted to the internal gear from a drive gear that rotates on an orthogonal axis, the rotational force of the motor is transmitted. The number of gears can be reduced.

According to a second aspect of the present invention, there is provided the power sliding device for a vehicle seat according to the first aspect, wherein a rotational force is transmitted to the drive gear from a group of reduction gears that rotate on an orthogonal axis. It is characterized by.

According to the second aspect of the invention, in addition to the effect of the first aspect, since the drive gear rotates about the orthogonal axis, the rotational force is transmitted from the reduction gear group rotating on the orthogonal axis. easy.

According to a third aspect of the present invention, there is provided the power sliding apparatus for an automobile seat according to the second aspect, wherein the left and right reduction gear groups are interlocked by a connecting shaft.

According to the third aspect of the present invention, in addition to the effect of the second aspect, the left and right reduction gear groups are provided and are linked to each other by a connecting shaft. A motor may be provided.

According to a fourth aspect of the present invention, there is provided the power sliding device for a vehicle seat according to any one of the first to third aspects, wherein the nut portion extends along a longitudinal direction of a bottom portion of the fixed rail. It is characterized by comprising a plurality of grooves formed.

According to the invention of claim 4, claims 1 to 1 are provided.
In addition to the effect described in any one of the above items 3, the number of parts does not increase because the nut portion is a plurality of grooves formed along the longitudinal direction of the fixed rail.

According to a fifth aspect of the present invention, there is provided the power slide device for an automobile seat according to the fourth aspect, wherein the grooves formed in the bottom portions of the left and right fixed rails are inclined in directions symmetric to each other. It is characterized by the following.

According to the fifth aspect of the present invention, in addition to the effect of the fourth aspect, since the groove of the bottom surface of the fixed rail is formed symmetrically in the left and right direction, the movable rail is prevented from rattling in the left and right direction. Is suppressed.

According to a sixth aspect of the present invention, there is provided a power slide device for an automobile seat according to any one of the first to third aspects, wherein the nut portion is attached to a bottom portion of a fixed rail in a longitudinal direction. And a rack member along the line.

According to the invention of claim 6, according to claims 1 to
In addition to the effect described in any one of 3 above, since the nut portion is a rack member that is a separate component from the fixed rail, there is no need to process the fixed rail, and the formation of the fixed rail is easy.

According to a seventh aspect of the present invention, there is provided the power sliding device for a vehicle seat according to any one of the first to sixth aspects, wherein the upper surface of the fixed rail is flush with the surface of the floor. It is characterized by.

According to the invention of claim 7, claims 1 to 1 are provided.
In addition to the effect described in any one of Items 6, the upper surface of the fixed rail is flush with the surface of the floor, so that the floor can be flattened, and the appearance and getting on and off can be improved.

According to an eighth aspect of the present invention, there is provided the power sliding apparatus for a vehicle seat according to any one of the first to seventh aspects, wherein a cutout portion for holding a gear unit is formed on the movable rail. It is characterized by being done.

According to the invention described in claim 8, claims 1 to
7. In addition to the effects described in any one of the above items 7, the gear unit
Not only the mounting of the bets is facilitated, by using the notch
The first screw gear can be meshed with the gear unit .

According to a ninth aspect of the present invention, there is provided the power sliding device for a vehicle seat according to any one of the first to eighth aspects, wherein the first screw gear , the reduction gear group, and the motor are arranged in advance. The fixed rail, the movable rail, and the gear unit can be assembled to the floor side in advance.

[0029] According to the ninth aspect of the present invention, the first to fifth aspects are provided.
8. In addition to the effects described in any one of the above items 8, the structure on the seat side and the structure on the floor side can be separately assembled and prepared, and the structure on the seat side is assembled to the structure on the floor side in the final assembling stage. The power slide device for the seat can be formed.

According to a tenth aspect of the present invention, there is provided the power sliding device for a vehicle seat according to any one of the first to ninth aspects, wherein the gear unit includes a first worm tooth meshing with a nut portion. , A second screw meshing with the first screw gear
It is characterized by having a gear .

According to the tenth aspect of the present invention, the first aspect is provided.
10. In addition to the effects described in any one of the above items 9, the portion meshing with the nut portion and the portion meshing with the first screw gear are separated, so that a convenient tooth size is selected for each portion. it can.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. In addition, in the figure, Y is the front-back direction, for example, in FIG. 1, the left is the front and the right is the back. X is a left-right direction (a direction orthogonal to the front-rear direction Y).

FIGS. 1 to 4 show a first embodiment of the present invention. Reference numeral 1 denotes an automobile seat.
Upper rails 2 as a pair of left and right “movable rails” are fixed to the lower surface of.

On the other hand, a lower rail 4 as a pair of left and right “fixed rails” is fixed to the floor 3, and the upper rail 2 is combined with the lower rail 4 so as to be slidable back and forth.

The lower rail 4 has a narrow opening 5 on its upper surface.
And the whole is embedded in the floor 3, and the upper surface of the lower rail 4 and the surface of the floor 3 are flush with each other.

Accordingly, the surface of the floor 3 is flattened,
Not only is the appearance good, but there is no risk that the foot will be caught on the lower rail 4 when getting on or off.

Further, since the opening 5 of the lower rail 4 is narrow, it is possible to prevent the heel of the high heel from entering, and it is difficult for dust to enter the lower rail 4.

Further, a plurality of grooves 7 as "nuts" are formed on the bottom surface 6 of the lower rail 4 at predetermined intervals along the longitudinal direction. The groove 7 is formed in an inclined state, and the grooves 7 formed in the left and right lower rails 4 are inclined in directions symmetric to each other.

As shown in FIG. 3, the upper rail 2
It has a structure in which two members are joined, has a joint portion 8 in the center, and has a cross-sectional shape having T-shaped portions 9 and 10 above and below it. The upper rail 2 and the lower rail 4 are slidably combined in the front-rear direction with the lower T-shaped part 10 inserted into the cross section of the lower rail 4 and the joint 8 located in the opening 5.

A notch 12 is partially formed near the joint 8 of the upper rail 2.
2, a gear unit 13 having a predetermined length is rotatably held. The gear unit 13 is located in the cross section of the lower rail 4 by being held in the notch 12. The gear unit 13 has a shape having first worm teeth 14 and a second screw gear 15.

The first worm tooth 14 is connected to the upper rail 2
In the groove 7. The first screw gear 16 provided in the gear box G for reduction meshes with the second screw gear 15. The first screw gear 16 is connected to the lower rail 4 through the opening 5.
And meshes with the second screw gear 15. Gearbox G is provided in a recess 17 formed on the lower surface of the sheet 1, the first screw gear 16 you rotate around an orthogonal axis 18 along the left-right direction. Drive gear 19 in mesh with the internal teeth 11 is provided in the gearbox G.

The drive gear 19 rotates about another orthogonal shaft 21. The orthogonal worm 21 is also provided with a drive worm wheel 22.

The orthogonal shaft 21 is also connected as a "connection shaft" to the drive worm wheel 22 on the other side.

The drive worm wheel 22 on the other side is originally unnecessary, but the motor 23 is provided on the drive worm wheel 22 on the other side depending on the meaning of balancing right and left and the type of vehicle. It was to be.

Further, the internal teeth 11 are formed on the first screw gear 16, and the torque of the motor 23 is transmitted to the internal teeth 11 from the drive gear 19 which rotates on the orthogonal shaft 21. The number of gears for transmitting torque can be reduced.

[0046] Sunawa Chi, orthogonal axis 21 of the first screw gear 16
Is omitted, and the drive gear 19 is directly meshed with the internal teeth 11 formed on the first screw gear 16.
The number of gears can be reduced.

While the first screw gear 16 rotates about the orthogonal shaft 18 while the gear unit 13 rotates about the axis in the front-rear direction, the gear unit 13 is parallel to the orthogonal shaft 21 connecting the left and right structures. And the formation of the orthogonal shaft 21 is easy. One of the left and right gear units 13 has a drive gear unit 2 on which a shaft of a motor 23 is attached.
4 are engaged. The gear box G is the first screw tooth
The vehicle 16 includes a drive gear 19, a drive first screw gear 22, and a drive gear unit 24.

With the above structure, the rotational force of the motor 23 is transmitted through various gears in the gear box G to the gear unit.
And the gear unit 13 is rotated. When the gear unit 13 rotates, the gear unit 1
3 engages with the groove 7 of the lower rail 4, the upper rail 2 slides back and forth with respect to the lower rail 4 together with the seat 1. Since the groove 7 is formed symmetrically,
Play of the upper rail 2 in the left-right direction is suppressed.

Since both the gear unit 13 and the groove 7 are provided in the lower rail 4, the gear unit 1
Dust and dust are hard to adhere to 3 etc. There is no possibility that the cover or the carpet of the seat 1 gets caught in the movable part.

The engagement between the gear unit 13 and the groove 7 causes the upper rail 2 and the lower rail 4 to slide back and forth when the motor 23 rotates (slide function), and to stop when the motor 23 stops. 2
The structure is such that the forward and backward movement is prevented (stopper function), so that both the slide function and the stopper function are reliable. Particularly, in this embodiment, the gear unit 13 has five teeth, and the five teeth are meshed with the five grooves 7 at the same time (only about 1.5 teeth are meshed with a normal spur gear). Even if an excessive load is applied to the seat 1 in the front-rear direction, the meshing state between the gear unit 13 and the groove 7 is not broken.

The maximum sliding amount of the seat 1 is determined by the length of the groove 7 which is the "nut portion". However, the length of the groove 7 may be increased within the range of the upper rail 2 no matter how long. Since the groove 7 is formed integrally with the upper rail 2, the longitudinal trajectory of the groove 7 always coincides with the upper rail 2. Unlike the conventional screw shaft, the parallel state with the upper rail 2 does not matter. Therefore, even if the formation length of the groove 7 is extended to make the sheet 1 longer, the assembling work of the apparatus does not become difficult. Further, even if the formation length of the groove 7 is extended, the predetermined length of the gear unit 13 can be kept as it is, so that it is easy to realize a long slide.

Further, in this embodiment, the gear box G and the motor 23 are pre-assembled on the seat 1 side, the lower rail 4, the upper rail 2 and the gear unit 13 are pre-assembled on the floor 3 side. The power slide device is formed at the stage when the power slide device is mounted. That is, the lower end of the first screw gear 16 projects downward from the gear box G attached to the seat 1, and the gear unit 13 is exposed in the notch 12 of the upper rail 2. Has become. Accordingly, in the final assembling work, the seat 1 is placed on the upper rail 2 and attached, whereby the first screw
The gear 16 meshes with the second worm tooth 15 of the gear unit 13 to complete the power slide device.

FIG. 5 is a view showing a second embodiment of the present invention. In this embodiment, a rack member 25 as a “nut portion” is attached along the bottom surface portion 6 of the lower rail 26.
The rack member 25 is a conventional nut having a bisected such cross-sectional shape, has a gear unit 13 and capable of meshing with the rack teeth on the inner surface, by being attached to the bottom part 6, always lower rail 4 And the same locus in the longitudinal direction (parallel to the lower rail 4). Therefore, even if the length of the rack member 25 is extended for a long slide, the gear unit is not required.
Always the same mesh with resulting from bets 13. Other configurations, functions, and effects are the same as those of the previous embodiment, and redundant description is omitted.

[0054]

According to the first aspect of the present invention, since the lower rail is integrally provided with the nut along the longitudinal direction, the nut is inevitably completely parallel to the lower rail. Is easy. Further, in order to increase the length of the seat, the gear unit can be easily realized simply by extending the length of the nut portion while keeping the predetermined length of the gear unit . Also, gear unit
Since the gear and the nut are meshed with each other, the number of teeth meshing with each other is larger than that of a simple spur gear, and the stopper function for preventing the sheet from moving back and forth when the motor is stopped is high.

Further, the internal gear is formed on the first screw gear, and the rotational force of the motor is transmitted to the internal gear by a drive gear that rotates on an orthogonal axis, so that the rotational force of the motor is transmitted. The number of gears can be reduced.

According to the second aspect of the present invention, since the driving gear rotates about the orthogonal axis, the torque can be easily transmitted from the reduction gear group rotating on the orthogonal axis.

According to the third aspect of the present invention, since the left and right reduction gear groups are provided and are linked to each other by the connecting shaft, the motor may be provided in either the left or right reduction gear group.

According to the fourth aspect of the present invention, the number of parts does not increase because the nut portion is a plurality of grooves formed along the longitudinal direction of the lower rail.

According to the fifth aspect of the present invention, since the grooves on the bottom surface of the lower rail are formed symmetrically, rattling of the upper rail in the left-right direction is suppressed.

According to the sixth aspect of the present invention, since the nut portion is a rack member that is a separate component from the lower rail, there is no need to process the lower rail, and the lower rail can be easily formed.

According to the seventh aspect of the present invention, since the upper surface of the lower rail is flush with the surface of the floor, the floor can be flattened, and the appearance and the getting on and off property are improved.

According to the eighth aspect of the present invention, the gear unit
Not only the mounting of the bets is facilitated, by using the notch
The first screw gear can be meshed with the gear unit .

According to the ninth aspect of the present invention, the structure on the seat side and the structure on the floor side can be separately assembled and prepared, and the structure on the seat side is assembled to the structure on the floor side in the final assembling stage. A seat power slide device can be formed.

According to the tenth aspect of the present invention, the portion meshing with the nut portion and the portion meshing with the first screw gear are separated, so that a convenient tooth size can be selected for each portion.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing a power slide device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a power slide device.

FIG. 3 is a sectional view taken along the line SA-SA shown in FIG.

FIG. 4 is a perspective view showing a peripheral structure of a gear unit and a first screw gear .

FIG. 5 is a sectional view showing a second embodiment of the present invention and corresponding to FIG. 3;

[Explanation of symbols]

Reference Signs List 1 seat 2 upper rail (movable rail) 3 floor 4 lower rail (fixed rail) 6 bottom part 7 groove (nut part) 11 internal teeth 13 gear unit 14 first worm tooth 15 second screw gear 16 first screw gear 18 orthogonal axis 19 Drive gear 21 Orthogonal axis (connection axis) 23 Motor 25 Rack member (nut part) G Gearbox Y Front and rear direction X Left and right direction (Orthogonal direction)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-38047 (JP, A) JP-A-4-166429 (JP, A) JP-A 7-5890 (JP, U) JP-A 4-86429 113230 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60N 2/00-2/72 F16H 25/24

Claims (10)

(57) [Claims] 1. A pair of left and right fixed rails fixed to a floor and a pair of left and right movable rails fixed to a seat are respectively slidably combined in a forward and backward direction, and a nut portion along a longitudinal direction is integrally formed on the fixed rail. A gear having a predetermined length, which meshes with the movable rail and a nut of a fixed rail.
The unit is provided, is meshed a first screw gear that rotates with orthogonal axis relative to the longitudinal direction of the gear unit, the first screw tooth
A power sliding device for a vehicle seat, wherein internal teeth are formed in a vehicle, and a rotational force of a motor is transmitted to the internal teeth from a drive gear that rotates on an orthogonal axis. 2. The power sliding device for a vehicle seat according to claim 1, wherein a rotational force is transmitted to the drive gear from a group of reduction gears that rotate on an orthogonal axis. Power slide device for seats. 3. The power sliding device for a vehicle seat according to claim 2, wherein the left and right reduction gear groups are interlocked by a connecting shaft. 4. The power slide device for an automobile seat according to claim 1, wherein the nut portion is formed along a longitudinal direction of a bottom portion of the fixed rail. A power slide device for an automobile seat, comprising: 5. The power slide device for a vehicle seat according to claim 4, wherein the grooves formed on the bottom surfaces of the left and right fixed rails are inclined in directions symmetric to each other. Power slide device for seats. 6. The power slide device for a vehicle seat according to claim 1, wherein the nut portion is a rack member along a longitudinal direction attached to a bottom portion of a fixed rail. A power slide device for a seat for an automobile, characterized in that: 7. The vehicle seat power slide device according to claim 1, wherein an upper surface of the fixed rail is flush with a floor surface. Power slide device for seats. 8. The power slide device for an automobile seat according to claim 1, wherein a cutout portion for holding a gear unit is formed on the movable rail. Power slide device for automotive seats. 9. The power slide device for a vehicle seat according to claim 1 , wherein the first screw gear , a reduction gear group, and a motor are previously assembled to a seat side. Fixed rail, movable rail and gear unit
Power slide device for an automobile seat which bets and is characterized in that Naru capable assembled beforehand floor side. 10. The power slide device for an automobile seat according to claim 1, wherein the gear unit includes a first worm tooth meshing with a nut portion and a first screw gear . What is claimed is: 1. A power slide device for a vehicle seat, comprising: a second screw gear that meshes with the power screw .