JPH0415539Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improvement of a power seat device that adjusts the position of a seat in an automobile or the like by a driving means.

(Prior Art) Conventionally, power seat devices installed in automobiles and the like have had a structure as shown in FIG. 1, for example.

That is, this power seat device 1 adjusts the position of the seat in the longitudinal direction, and has two rails 2 fixed in a position substantially parallel to the floor surface.
a, 2b, and respective slide members 3a, 3 for seat attachment that are slidable along the respective rails 2a, 2b.
b, and the front and rear end sides (first
The fixed plate 5 on the rear end side is equipped with a driving motor 6 with both ends of the rotating shaft facing the respective rails 2a, 2b. Further, deceleration mechanisms 7a and 7b, each of which has a built-in worm and a worm wheel, are provided at both ends of the rotating shaft.

Further, between the fixed plates 4 and 5, there are two threaded rods 8a, which are substantially parallel to the respective rails 2a and 2b.
8b is installed, and each of the threaded rods 8a, 8b
is rotatably supported at one end by respective bearings 9a and 9b provided on the fixed plate 4 on the front end side, and the other end is connected to, for example, a worm wheel of each of the speed reduction mechanisms 7a and 7b. ing.

Furthermore, both the slide members 3a, 3b
includes a bracket 11a equipped with a female threaded portion 10,
11b is attached, and the female threaded portion 10,
The male threads of the respective threaded rods 8a and 8b are in a meshed state.

Note that the seat (not shown) is attached to both slide members 3.
Attachment is accomplished by straddling the upper sides of parts a and 3b.

The power seat device 1 configured as described above is
By operating the drive motor 6, each deceleration mechanism 7
The threaded rods 8a and 8b rotate through the threaded rods 8a and 7b, and the respective slide members 3 are rotated together with the brackets 11a and 11b meshed with the threaded rods 8a and 8b.
a, 3b were adapted to slide along rails 2a, 2b.

However, in such a conventional power seat device 1, since both ends of the threaded rods 8a, 8b are supported by bearings 9a, 9b and deceleration mechanisms 7a, 7b, each slide member 3a, 3b
and each threaded rod 8a for the rails 2a, 2b,
8b is required to be in an accurate parallel relationship, and the positioning of the female threaded portion 10 accompanying the installation of each bracket 11a, 11b, and the alignment of the drive motor 6 are required.
There was a problem in that it was difficult to arrange the parts.

(Purpose of the invention) This invention was made by focusing on the above-mentioned conventional problems, and it supports only one end of the threaded rod together with a gear mechanism that directly meshes with the threaded part of the threaded rod. By forming the one end into a self-aligning sphere, it is possible to absorb positional errors between the supporting portion of the threaded rod and the gear mechanism, and the threaded rod can be easily arranged with respect to the slide body and the rail. The purpose is to provide a power seat device that can

(Structure of the invention) The structure of the power seat device according to this invention includes a slide body for mounting the seat that moves along a rail fixed to the floor surface, and a sliding body that is erected on the floor surface and has forward and backward movement limits of the slide body. a standing wall portion that restricts further movement of the slide body forward and backward in the position; and a vertical wall portion whose movement direction of the slide body is an axial direction and which has a ball-shaped spherical surface portion at one end and which restricts the movement of the slide body. a threaded rod having a male threaded portion with a length equal to the stroke; and a threaded rod that is connected to a driving means and meshes with the male threaded portion of the threaded rod within a movement range of the sliding body, and that moves the sliding body forward and backward. a gear mechanism that disengages from the male threaded portion at a limit position; the threaded rod is rotated by a pair of holding blocks fixed to the slide body and having a spherical recess that engages with a spherical portion of the threaded rod; A direction in which the male threaded portion of the threaded rod engages with the gear mechanism at the forward and backward movement limit positions of the sliding body by being interposed between the sliding body and the vertical wall portion and supporting the sliding body irrevocably. It is characterized by being provided with an elastic body that biases each of them.

(Example) This invention will be explained below based on the drawings.

FIGS. 2 and 3 are diagrams illustrating an embodiment of this invention.

That is, this power seat device 15
As shown in the figure, two rails 16a, 1 are arranged substantially parallel to each other with the longitudinal direction of the seat being the longitudinal direction.
6b, and a seat mounting slide body 17 that moves along the rails 16a, 16b.

The slide body 17 has respective rails 16a,
Elongated slide members 18a and 18b slidably engaged along the slide member 16b, and the slide member 1
8a and 18b, and supports one end of a threaded rod 20 whose axial direction is the direction of movement of the slide body 17 at approximately the center of the fixing plate 19. ing.

The threaded rod 20 has a male threaded portion 20a having a predetermined length, that is, a length equal to the movement stroke of the slide body 17, and has a ball-shaped spherical portion 21 at one end. A pin 22 for regulating the rotation of the threaded rod 20 is provided in the pin 21 so as to penetrate from the side. In addition, in the threaded rod 20, both ends of the threaded portion 20a are narrow diameter portions that are approximately equal to the thread bottom diameter of the male threaded portion 20a, and the female thread of the gear mechanism described later is formed in this portion. It deviates from 20a and starts spinning around.

When attaching one end of the threaded rod 20, as shown in FIG. The spherical part 21
Store the presser block 2 in a hugging manner, and then
3 is housed in the block case 24, and then the block case 24 is fixed to the fixing plate 19 with bolts 25, thereby supporting the spherical part 21 so as not to rotate.

Here, the threaded rod 20 is supported by a pin 22 so that it cannot rotate, and its movement in the axial direction is restricted by a spherical part 21. 23 and the block case 24, there is an appropriate gap, and the spherical part 21 in the spherical recess 23a is rotatable within a certain range.

Furthermore, between both rails 16a and 16b, a plate 27 is fixed to the floor surface with a plurality of bolts 26.
and a bracket 29 to which a drive motor 28 serving as drive means is attached.

The plate 27 is provided with standing wall portions 27a and 27b that face each other on the front and rear sides in the direction in which the fixed plate 19 moves (vertical direction in FIG. 2), and on the opposing surfaces of each of the vertical wall portions 27a and 27b. , the fixed plate 1
Coil spring 30 (elastic body) that can come into contact with the side surface of 9
and a coil spring 31 (elastic body) that can come into contact with the side surface of the block case 24, and the slide body 17 is moved to a position (movement limit position) where the gear mechanism and the male threaded portion 20a, which will be described later, are disengaged. At this time, by biasing the slide body 17 in the opposite direction with the coil springs 30 and 31 corresponding to the moving direction, the gear mechanism and the male threaded portion 20a can be easily screwed together again.

Note that the threaded rod 20 has one vertical wall portion 27b.
and the inside of the coil spring 31 provided on the vertical wall portion 27b.

A gear mechanism 32 that transmits the rotation of the drive motor 28 includes a worm 33 formed on the motor shaft;
Worm wheel 3 engaged with the worm 33
4, the worm wheel 34
A female thread (not shown) that engages with the male threaded portion 20a of the threaded rod 20 is formed on the inner diameter of the threaded rod 20.
As described above, the female threaded portion is designed to detach from the male threaded portion 20a and rotate freely when the slide body 17 reaches the forward and rearward movement limit positions.

Note that reference numeral 35 in FIG. 2 is a bolt attachment portion used to attach the seat to both slide members 18a, 18b.

In the power seat device 15 configured in this way, when the drive motor 28 is operated, the worm wheel 34 of the gear mechanism 32 rotates,
The threaded rod 20 with which the male threaded portion 20a is engaged is driven in the axial direction, and at the same time the slide body 17 to which the seat is attached moves along the rails 16a, 16b.

At this time, the threaded rod 20 does not rotate about the shaft because the pin 22 is locked in the presser block 23, but the portion supported by the spherical recess 23a has a ball-shaped spherical surface. part 21, and since the spherical part 21 is rotatable within a certain range, the slide body 17
As the threaded rod 20 moves, errors caused by the arrangement of the gear mechanism 32 and the supporting portion of the threaded rod 20 are absorbed by the rotation, and a smooth operating condition is maintained.

Furthermore, when the slide body 17 reaches the forward or backward movement limit position, the female thread of the gear mechanism 32 comes off the male threaded portion 20a of the threaded rod 20 and rotates freely, so that the drive motor 28 is not activated. It is necessary to provide a circuit that will prevent the motor 28 from burning out even if the drive continues, and will stop the drive motor 28 by detecting, for example, a limit switch or the like when the slide body 17 reaches its limit position. There is no. Furthermore, since the slide body 17 is biased by the coil spring 30 or 31 in a direction in which the female thread meshes with the male thread portion 20a, when the drive motor 28 is operated in the opposite direction, the female thread It is easy to re-engage with the male threaded portion 20a, and the slide body 17 can be quickly moved in the opposite direction.

In addition, in the above embodiment, one threaded rod 2
0, but a plurality of the threaded rods 20 may be installed.

(Effects of the invention) As explained above, according to this invention,
A slide body for mounting a seat that moves along a rail fixed to a floor surface; a vertical wall portion for regulating movement; and a threaded rod having an axial direction in which the slide body moves, a ball-shaped spherical portion at one end, and a male thread portion having a length equal to the movement stroke of the slide body. a gear mechanism that is connected to a driving means and meshes with the male threaded portion of the threaded rod within a movement range of the slide body, and disengages from the male thread portion at forward and backward movement limit positions of the slide body; A pair of holding blocks fixed to the slide body and having a spherical recess that engages with a spherical part of the threaded rod support the screw rod in a non-rotatable manner; An elastic body is provided between the slide body and urges the slide body in the direction in which the male threaded portion of the threaded rod meshes with the gear mechanism at the forward and backward movement limit positions of the slide body, respectively. For example, when compared with a conventional power seat device in which both ends of the threaded rod are fixed, the power seat device corrects the positional error between the threaded rod support portion and the gear mechanism by the axis between the spherical recess and the spherical portion. It is possible to absorb the rotation by rotation other than rotation, and when manufacturing the screw rod, the drive means, etc. can be easily arranged, and the drive motor is prevented from being burnt out with a simple mechanism. It has the following effects:

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating the structure of a conventional power seat device, FIG. 2 is a plan view illustrating a power seat device according to an embodiment of the invention, and FIG.
The figure is an enlarged sectional view illustrating the procedure for assembling the spherical portion of the threaded rod and a pair of presser blocks each having a spherical recess. 15...Power seat device, 16a, 16b...
...Rail, 17...Slide body, 20...Threaded rod, 20a...Male thread part, 21...Spherical part, 23
... Presser block, 23a ... Spherical recess, 27
a, 27b... Standing wall portion, 28... Drive motor (drive means), 30, 31... Coil spring (elastic body), 32... Gear mechanism.

Claims (1)

[Claims for Utility Model Registration] A slide body for mounting a seat that moves along a rail fixed to a floor surface; an upright wall portion that restricts further movement forward and backward; and a vertical wall portion whose length is equal to the movement stroke of the slide body, with the direction of movement of the slide body being the axial direction, and having a ball-shaped spherical portion at one end. a threaded rod provided with a threaded portion; and a threaded rod that is connected to a driving means and meshes with the male threaded portion of the threaded rod within the movement range of the slider, and that engages the male threaded portion at forward and backward movement limit positions of the slider. a gear mechanism that is disengaged from the threaded rod; a pair of presser blocks fixed to the slide body and having a spherical recess that engages with a spherical portion of the threaded rod support the threaded rod in a non-rotatable manner; an elastic body that is interposed between the slide body and the vertical wall portion and urges the slide body in a direction in which the male threaded portion of the threaded rod meshes with the gear mechanism at forward and backward movement limit positions of the slide body; A power seat device comprising: