JP2551758Y2 - Nut device for power slide device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut device for a power slide device used for a vehicle seat or the like.

[0002]

2. Description of the Related Art Conventionally, as a power slide device used in an automobile, a type using a rack and a pinion and a type using a lead screw and a nut are known.

FIG. 1 shows an example of a type using the lead screw and the nut.

In FIG. 1, reference numeral 1 denotes a lower rail fixed to a vehicle floor via a mounting bracket, and 2 denotes an upper rail slidably fitted to the lower rail 1 to fix a seat. A lead screw 3 is rotatably supported on the upper rail 2 in a direction parallel to the sliding direction (front-rear direction). The lead screw 3 is also fixed to the upper rail 2 via a reduction gear device 5 by a motor 4 fixed to the upper rail 2. It is driven to rotate. A nut device 10 rotatably provided in a horizontal direction on a mounting bracket 6 fixed to the lower rail 1 is screwed to the lead screw 3.

When the lead screw 3 on the upper rail 2 side is rotated by the motor 4, the lower rail 1
The upper rail 2 is moved by screwing with the nut device 10 provided on the side, and the front / rear position of the seat is adjusted.

[0006]

However, in the power slide device having the above structure, the lead screw 3 is supported at the front and rear ends of the upper rail 2, so that the axis of the lead screw 3 is caused by the variation of the product. It may deviate from the standard. Therefore, in the nut device 10,
A slight clearance is provided so as to be movable in the left-right direction and the up-down direction, and in the horizontal rotation direction, the nut device 10 is pivotally attached to the mounting bracket 6 as described above to absorb the respective deviations. I have. However, with respect to the inclination of the lead screw 3 in the vertical plane,
When trying to absorb by providing a clearance in the front and rear direction,
This cannot be adopted because the sheet is rattled, and the inclination error cannot be absorbed after all. As a result, if a product variation error or the like becomes large, it becomes impossible to absorb the variation error, and there is a problem that abnormal noise is generated at a forward end or a backward end of the slide.

[0007] The object of the present invention is to solve such a conventional problem and eliminate the occurrence of abnormal noise over the entire area of the slide.
Moreover, it is an object of the present invention to provide a power slide device nut device that can be easily assembled.

[0008]

In order to achieve the above object, the present invention is provided on one of a lower rail fixed to a floor and an upper rail fixed to a seat, and is rotatable in the other direction. In a nut device for a power slide device that is screwed to a lead screw supported by a lead screw, an outer case held rotatably in a horizontal direction with respect to an axis of the lead screw on the one of the rails; A nut case is held movably in the vertical and horizontal directions with respect to the axis, and a screw hole is formed in the nut case so as to be rotatable in the direction perpendicular to the axis and to which the lead screw is screwed. The nut case is formed of two parts vertically divided with respect to the rotation axis, and the two parts are Together configured to be engaged with each other, the shaft portion on one of the threaded member or nut case, characterized in that the bearing hole on the other are provided.

[0009]

According to the present invention, a screw member to which a lead screw rotatably supported by either the lower rail or the upper rail is screwed is held by a nut case so as to be rotatable in a vertical direction. The outer case is movably held in the upper and lower directions and the left and right directions, is formed of two parts, is rotated about the rotation axis of the screw member and is engaged with each other, and the outer case is a lower rail or an upper. Since it is held rotatably in one of the rails in the horizontal direction, it is possible to easily assemble and absorb variations in products except in the front-rear direction.

Therefore, generation of abnormal noise is prevented without causing rattling of the sheet.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The overall configuration of the power slide device is as described above, and FIG. 1 and the description related thereto will be cited.
An embodiment of the nut device 10 according to the present invention is shown in FIGS.

FIG. 2 shows an assembled state of the nut device 10.
FIG. 3 shows each component.

In FIG. 1, reference numeral 11 denotes an outer case, which is formed by bending a metal plate member into a substantially U-shaped cross section. A square opening 11B is formed in the opposing side walls 11A, 11A, and a pin 11D is provided on the bottom wall 11C for holding the mounting bracket 6 shown in FIG. 1 so as to be rotatable in the horizontal direction. (See FIG. 4). Two claws 11E, 11E are provided at both side edges of the side wall 11A by being bent at right angles, and a space for extending the lead screw 3 is secured between the four claws.

Reference numerals 12 and 12 denote a rubber holding member for preventing backlash, which has a substantially U-shaped cross section, and has a hole 12A for inserting the lead screw 3 at the center thereof. 1
Numeral 3 designates a nut case having a substantially cubic shape in its assembled state. In this embodiment, two shell-shaped parts 13A, 13A are provided.
13B, and is formed in line symmetry with respect to the axis of the lead screw 3 and the axis orthogonal to the axis of the screw hole 14D of the screw member 14 described later and the axis of rotation of the screw member 14. That is, the portions 13A and 13B of the nut case 13 have the bearing holes 13A ₂ ,
Substrate 13A ₁ , 1 having a substantially square shape with 13B ₂ formed therein
3B ₁ and, substrate portion 13A _1, 13B ₁ of the diagonal shoulder bent formed L-shaped in section hook piece 13A ₃ and 13
A ₄ , 13B ₃ and 13B ₄ .

The screw member 14 includes a prismatic main body 14A, shafts 14B, 14B protruding from both side ends thereof, and guide surfaces 14C, 14C formed at upper and lower ends. The prismatic main body 14A has a shaft. A screw hole 14D into which the lead screw 3 is screwed is provided in a direction orthogonal to the axis of the portions 14B, 14B. Guide surface portion 14C is threaded hole 14D slope portion 14C ₂ on both sides parallel to the parallel surface portions 14C ₁ to the axis, 14C
It has _two .

A nut device 10 comprising the above-described components.
When assembling, first, the shaft portions 14B,
Part 1 of nut case 13 in which 14B is formed into two parts
3A, the bearing hole 13A of the 13B _2, 13B ₂ to as the hook piece does not interfere, i.e., the hook piece 13A _3,
13A ₄ , 13B ₃ , and 13B ₄ are moved along the slope 14C ₂ of the guide surface 14C and fitted.
A and 13B are turned around the rotation axis of the screw member 14 to engage the respective hook pieces to unite the two.

This state is shown in FIG. In this state, the shaft portion 14B of the screw member 14 is
3 supported by the bearing portions 13A ₂ , 13B ₂ and the screw member 1
4 is held rotatably in the vertical direction.

After the nut case 13 holding the screw member 14 is clamped by the backlash holding members 12, 12, these are held against the opposing walls 11A, 11A of the outer case 11.
Insert between 11A. At this time, both ends of the nut case 13 protrude from the openings 11B, 11B of the opposing walls 11A, 11A, and a slight clearance is provided between the nut case 13 and the opening 11B so that the nut case 13 can be moved in the vertical direction. Have been. Next, the outer case 11 is mounted on the mounting bracket 6 so that the pin 11D can be rotated in the horizontal direction. Furthermore, the screw hole 14 of the screw member 14
D is screwed with the lead screw 3.

In the present embodiment having the above-described structure, relative movement occurs between the lead screw 3 and the nut device 10 as the lead screw 3 rotates. 13 and outer case 11
The gap in the left-right direction is absorbed by the nut case 13 moving in the direction perpendicular to the paper surface with respect to the backlash holding member 12 in FIG.

The displacement in the horizontal rotation direction is absorbed by the outer case 11 being held rotatably in the horizontal direction by the pin 11D, and the displacement in the vertical rotation direction is prevented by the screw member 14 being attached to the nut case 13. It is absorbed by being held rotatably in the vertical direction.

The longitudinal dimension between the nut case 13 and the opening 11B is set with high precision so as not to cause a clearance, so that the seat does not rattle in the longitudinal direction.

Further, according to the present embodiment, the screw member 14
Bearing hole 13 of nut case 13 for supporting shaft portion 14B
Since A ₂ and 13B ₂ are continuous without being divided, they can be supported accurately without any hole displacement. In addition, the nut case 13 can be assembled simply by engaging the hook pieces by rotation, so that the nut case 13 can be easily assembled.

[0024]

As is clear from the above description, according to the present invention, all deviations in the dispersion direction can be absorbed except in the front-back direction which affects the rattling of the seat. There is no excessive force generated between the nut and the nut device, the generation of abnormal noise can be prevented, and the assembling can be performed easily.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a power slide device.

FIG. 2 is a perspective view showing the nut device according to the embodiment of the present invention;

FIG. 3 is a perspective view showing components of the nut device according to the embodiment of the present invention;

FIG. 4 is a sectional view showing an assembled state of the embodiment of the present invention;

[Explanation of symbols]

1 the lower rail 2 upper rail 3 lead screw 10 nut 11 outer case 11B opening 12 rattling-preventing holding member 13 (13A, 13B) Nut Case 13A _2, 13B ₂ bearing hole _{13A 3, 13A 4, 13B 3} , 13B 4 hooks Part 14 Screw member 14B Shaft part 14D Screw hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A nut device for a power slide device which is provided on one of a lower rail fixed to a floor and an upper rail fixed to a seat and is screwed to a lead screw rotatably supported in the other direction. An outer case held on the one of the rails so as to be rotatable in the horizontal direction with respect to the axis of the lead screw; and a nut case held in the outer case so as to be movable vertically and horizontally with respect to the axis. And a screw member which is held by the nut case so as to be rotatable in a direction perpendicular to the axis, and which has a screw hole into which the lead screw is screwed, wherein the nut case is arranged with respect to the rotation axis. And formed in two vertically divided parts, the two parts are configured to be engaged with each other, and the screw member Other shaft portion on one of the nut case,
A nut device for a power slide device, characterized in that a bearing hole is provided on the other side.