JPH0639557U - Nut unit structure of spiral axis type moving device - Google Patents

Abstract

(57) [Abstract] [Purpose] A nut unit that moves in the axial direction of the spiral shaft based on the rotation of the spiral shaft has no axial misalignment due to the rotation.
In addition, the collision noise generated by the contact between the nut and the nut holder is not generated. [Constitution] The nut unit 5 comprises a box-shaped nut holder 9, a nut 7 which is fitted to the nut holder, and which is screwed onto the spiral shaft 4, and an elastic body 8 interposed between the nut holder and the nut. The body is configured to include a wrapping surface portion for wrapping the bottom surface portion 7a of the nut and the five face portions of the four side surface portions 7b, 7c, 7d and 7e.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nut unit structure of a spiral shaft type moving device which is mounted on a seat for an electric moving type vehicle equipped in a vehicle such as a private car or a truck.

[0002]

[Problems to be Solved by Prior Art and Invention]

 In general, such a spiral shaft type moving device is provided with a nut unit that relatively moves in the axial direction of the spiral shaft based on the rotation of the spiral shaft, provided on the spiral shaft that rotates based on the forward and reverse driving of an electric motor. In this case, the nut unit is a box-shaped nut holder that is integrally provided on the side of the body that moves relative to the spiral axis and that is open upward. Some of them are composed of nuts whose shafts are screwed in a penetrating manner. By the way, in this product, since the nut is fitted in the nut holder in a non-rotating manner, when the spiral shaft rotates, the nut moves axially with respect to the nut holder and a strong pressure is applied to the inner surface of the nut holder. There is a problem that even if the spiral shaft is rotated in the reverse direction to move backward in such a state, the tightening state is not released and it does not move.

Therefore, as shown in FIG. 6, an elastic body 11 is interposed between the spiral shaft projecting surface of the nut 10 and the inner surface of the nut holder 12 to restrict the tightening state. is there. However, in this structure, the nut 10 has a play in the axial direction with respect to the nut holder 12 due to the assembling property and the like, so that the nut 10 and eventually the spiral shaft 13 cannot be centered, and the nut 10 is stable. Not only is the movement function impaired, but the nut 10, which rotates with the amount of play as the spiral shaft 13 rotates, comes into contact with the inner surface of the nut holder 12 and produces a jarring collision sound. . In order to solve this, as shown in FIG. 9, the invention was devised to cover the circumferential surface of the nut 10 with the cushioning material 14 in the development process up to the present invention. However, in this case, in addition to the elastic body 11, the cushioning material 14 is required, which causes another problem that the number of parts is increased and the workability of the assembling work is deteriorated.

[0004]

[Means for Solving the Problems]

 The present invention was devised with the object of providing a nut unit structure of a spiral shaft type moving device capable of eliminating these drawbacks in view of the above-mentioned circumstances, and based on forward and reverse driving of an electric motor. When providing a nut unit that relatively moves in the axial direction of the spiral shaft based on the rotation of the spiral shaft on the spiral shaft that rotates, the nut unit is integrally formed on the side of the body that relatively moves with respect to the spiral shaft. A box-shaped nut holder that is open to the upper side, a nut that fits into the nut holder in a non-rotating manner, and the spiral shaft is screwed through in a penetrating manner, and an elastic body that is interposed between the nut holder and the nut. Further, the elastic body covers at least five faces of the bottom face of the nut, a pair of projecting side faces on which the spiral shaft projects, and a pair of parallel side faces parallel to the spiral shaft. And it is characterized in that it is integrally formed with that coating surface.

According to the present invention, the nut unit is stably moved and the collision noise between the nut and the nut holder due to the rotation of the spiral shaft is not generated.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a seat moving device mounted between a lower portion of a seat for an electric mobile vehicle equipped on a vehicle such as a private car and a truck and a skeleton. The seat bracket 3 includes a spiral shaft 4 that is freely rotatable, a nut unit 5 that will be described later that is provided on the body side, and a drive motor 6 that drives the spiral shaft 4 forward and backward. All are the same as before. Then, the nut shaft 5 moves relative to the axial center of the spiral shaft 4 by the forward and reverse rotation of the spiral shaft 4 as the drive motor 6 is driven, whereby the seat 2 moves in the front-rear direction. I'm running.

The nut holder 9 constituting the nut unit 5 is made of steel and has a box shape with an open upper part. A fixing bolt 9c for integrally mounting on the body side is provided on the bottom surface of the nut holder 9 so as to project. Has been done. On the other hand, 7 is a resin nut formed in a rectangular tube shape so as to be fitted in the nut holder 9 in a non-rotating manner. The nut 7 has a spiral groove into which the screw shaft 4 is screwed in a penetrating manner. 7f is engraved. Then, the spiral shaft 4 penetrating from the nut 7 penetrates through holes 9b formed in both axial plate surfaces 9a of the nut holder 9 in a loose fitting manner, but between the nut holder 9 and the nut 7. The elastic body 8 embodying the present invention is interposed between the two. That is, like the nut holder 9, the elastic body 8 of the present embodiment is in the shape of a box with an open top, and the bottom surface 7a of the nut 7 and the four side surfaces 7b, 7c, 7d standing upright from the bottom surface 7a. , 7e are integrally formed with a covering surface portion 8a for covering the five surface portions in a covering shape, and the nut 7 is structured to be fitted in a covering shape except for the upper side. A through hole 8b is formed on both axial side surfaces of 8a, through which the spiral shaft 4 freely fits. Moreover, the outer shape of the elastic body 8 is set so as to be fitted into the nut holder 9, so that the elastic body 8 is interposed between the nut holder 9 and the nut 7 on the five surfaces. It is configured to

In the embodiment of the present invention constructed as described above, in order to assemble the nut unit 5 to the spiral shaft 4, for example, after the elastic body 8 is fitted in the nut holder 9, the nut 7 is fitted in the elastic body 8. It suffices to form the nut unit 5 by fitting it inside and screw the spiral shaft 4 into the spiral groove 7f of the nut unit 5 and the through holes 8b and 9b.

As described above, the elastic body 8 is interposed between the nut holder 9 and the nut 7. The elastic body 8 is wrapped around the bottom surface of the nut 7 and the side surfaces of the four circumferences. Since it is to be fitted to the outside, it is not inserted only at the part where the spiral shaft 13 projects between the nut 10 and the nut holder 12 like the conventional elastic body 11, and the part including the part is included. The nut 7 and the nut holder 9 are interposed between all of the five facing surface portions that face each other. As a result, the nut 7 is not only axially opposed to the nut holder 9 but also axially. The nut 7 does not come into contact with the inner surface of the nut holder 9 and an unpleasant collision noise is not generated because the nut 7 is elastically received in the circumferential direction. Moreover, since the nut 7 is elastically supported by the elastic body 8 on the five opposing surface portions with respect to the nut holder 9, the nut 7 is fitted to the nut holder 9 and the spiral shaft 4 is extended. There is also an advantage that the nut holder 9 is centered.

Incidentally, the present invention is not limited to the above-mentioned embodiment, and the nut 7 can be incorporated into the nut holder 9 by attaching the nut 7 to the nut holder 9 while the elastic body 8 is fitted on the nut holder 9. It can also be assembled by fitting it internally. Further, as the elastic body 8, as in the second embodiment shown in FIG. 4, in the covering surface portion 8d of the elastic body 8, the intermediate portion of the pair of parallel side surface portions 8e parallel to the spiral axis 4 is cut. The notches 8f and 8g may be formed. In this case, when the elastic body 8 is fitted in the nut holder 9, the parallel side surface portion 8e is bent inward due to a dimensional error, and the nut 7 is removed. There is an advantage that it can be surely avoided that it becomes difficult to embed.

[0011]

[Operation effect]

 In short, since the present invention is constructed as described above, the elastic body of the nut unit assembled to the spiral shaft is interposed between all of the five facing surface portions where the nut and nut holder face each other. Will be. As a result, the nut is elastically received by the elastic body even in the direction around the axis of the spiral shaft, and an unpleasant collision sound is generated when the nut directly contacts the inner surface of the nut holder. There is nothing to do. Moreover, since the elastic body itself has a box shape, the number of parts does not increase and the assembly work is not troublesome.

In addition, since the five opposing surface portions of the nut with respect to the nut holder are elastically supported by the elastic body, the nut is positioned at the fitting position with respect to the nut holder, and further, the core of the spiral shaft with respect to the nut holder. You can make a decision.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a sheet moving device.

FIG. 2 is an exploded perspective view of a nut unit.

FIG. 3 is a plan view showing a state where an elastic body is incorporated in the nut holder.

FIG. 4 is a perspective view of an elastic body showing a second embodiment.

FIG. 5 is a plan view showing a state in which an elastic body according to a second embodiment is incorporated in a nut holder.

FIG. 6 is an exploded perspective view of a nut unit showing a conventional example.

FIG. 7 is a perspective view of a nut unit showing a conventional example.

FIG. 8 is a side sectional view of a nut unit showing a conventional example.

FIG. 9 is a perspective view of a cushioning material showing a prior art example.

[Explanation of symbols]

 4 spiral shaft 5 nut unit 6 electric motor 7 nut 8 elastic body 8f notch 8g notch 9 nut holder

Claims (2)

[Scope of utility model registration request] 1. When providing a nut unit that relatively moves in the axial direction of the spiral shaft based on the rotation of the spiral shaft to the spiral shaft that rotates based on forward and reverse driving of an electric motor, the nut unit is the spiral shaft. A box-shaped nut holder that is integrally provided on the side of the body that moves relative to the nut holder; And an elastic body interposed between the nuts, and the elastic body encloses at least five face portions of a bottom face portion of the nut and four side face portions standing upright from the bottom face portion. A nut unit structure of a spiral shaft type moving device, characterized in that it is integrally formed with a holding surface portion. 2. The covering surface portion of the elastic body according to claim 1, wherein the covering surface portion covering a pair of parallel side surface portions parallel to the spiral axis is notched at an axial middle portion. The nut unit structure of the spiral shaft type moving device.