JPH057077Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seat lifter provided in a vehicle seat or the like.

[Prior Art] A vehicle seat, particularly a driver's seat, is equipped with a seat lifter for adjusting the height of the seat according to the physique and preferences of the occupant.

An example of the structure of this seat lifter is shown in FIGS. 4 and 5.

In the figure, 1 is a seat, 2 is a base frame fixed to an upper rail 3a of a slide rail 3 fixed to the floor side, and this base frame 2 is arranged symmetrically on both left and right sides. A lifter mechanism is constructed between the front part of the base frame 2 and the seat frame 1a disposed inside the seat 1, and the lifter mechanism adjusts the front part of the seat up and down. has been completed.

That is, a shaft hole 4 is bored in the front part of the base frame 2, and a lifter shaft 5 is inserted through and supported by the shaft hole 4, and an E-ring 6 is fitted into a groove 5a formed at the end of the shaft hole 4. It is designed to prevent it from falling out. An operating ring 7 is fixed to the lifter shaft 5 inside the base frame 2, and the free end of the operating link 7 is connected via a connecting ring 8 to a bracket 9 fixed to the lower surface of the seat frame 1a. The seat frame 1a, that is, the seat 1, is moved up and down via the connecting link 8 by the rotation of the operating link 7 as the lifter shaft 5 rotates.

A mechanism for rotationally driving the lifter shaft 5 includes a sector gear 10 fixed to the lifter shaft 5 along the inner surface of the base frame 2;
It consists of a drive gear 11 that is pivotally supported by the base frame 2 in front of the shaft support of the lifter shaft 5 and meshes with the sector gear 10.
1 is rotated by the rotation operation mechanism, the sector gear 10 is rotated, that is, the lifter shaft 5 is rotationally driven.

As this rotational operation mechanism, a friction brake device 12 employed, for example, in a wind regulator of an automobile is used, and its internal configuration is a well-known friction locking mechanism, so a description thereof will be omitted. This brake device 12 has an operating shaft 13 protruding from the outside and an operating shaft 14 protruding from the inside, and the operating shaft 14 is rotated integrally by the rotation operation on the operating shaft 13 side. Even if the rotation is applied, the rotation is prevented by an internal friction locking mechanism.

A drive gear 11 is fixed to an operating shaft 14 of this brake device 12, and an operating handle 15 is fixed to an operating shaft 13. This brake device 12 is fixed to the outer surface of the base frame 2, and the operating shaft 14 is pivotally supported by a bearing portion 16 provided on the base frame 2.

This bearing part 16 is formed to protrude inside the base frame 2, and a window hole 17 is formed in the rear part of the bearing part 16.
It meshes with.

In the meshing portion between the drive gear 11 and the sector gear 10, the drive gear 11 and the sector gear 1
A meshing holding portion 18 is formed to protrude so as to cover the side surface of the meshing portion of No. 11 is prevented from coming off.

[The problem that the idea attempts to solve]

In assembling the seat lifter constructed in this way, the brake device 12 with the drive gear 11 attached is first fixed to the base frame 2, and then the lifter shaft 5 is inserted into the shaft hole 4 and the sector gear 10 is inserted. A step is taken to mesh the drive gear 11, but at this time the sector gear 10 interferes with the mesh holding part 18, and it is difficult to insert the lifter shaft 5 straight into the shaft hole 4 and mesh the sector gear 10 with the drive gear 11. Can not.

Therefore, the lifter shaft 5 is inserted into the shaft hole 4 at a rotation position where the sector gear 10 and the drive gear 11 do not correspond.
Thereafter, the sector gear 10 is rotated, and the handle 15 is operated to rotate the drive gear 11 while the sector gear 10 is engaged from the end teeth thereof.

However, this method requires an extra man-hour of turning the handle 15, which has the disadvantage of poor production efficiency.

In addition, in the seat lifter with this configuration,
The sector gear 10 itself may be used as a rotation stopper by filling the teeth at the end of the sector gear 10, that is, by forming no teeth at the end of the sector gear 10. In this case, the drive gear 11 as described above may be used. A method in which the sector gear 10 is engaged from the terminal part while rotating the sector gear 10 does not work.

The present invention has been developed in view of the above, and an object of the present invention is to provide a seat lifter having a meshing holding portion that prevents the sector gear from coming off, which can be assembled smoothly with a simple structure.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention is inserted into and supported by a shaft hole formed on either one side of a fixed base frame or a movable seat frame, for example, on the base frame side, and by rotation thereof. A lifter shaft that raises and lowers the seat frame relative to the base frame via a link mechanism, a sector gear fixed to the lifter shaft, and a sector gear that is pivotally supported by the base frame and meshes with the sector gear, and is rotationally driven by a rotation operation mechanism. A seat lifter comprising a driving gear, and a meshing holding part for preventing the sector gear from coming off is formed near the shaft support of the driving gear so as to cover the side surface of the meshing part of the sector gear and the driving gear. The shaft hole is formed to have a diameter larger than the diameter of the lifter shaft by at least the amount of overlap between the mesh holding part and the sector gear, and the shaft is inserted through the large diameter shaft hole and supported by the shaft. be.

[Effect]

The measures described above operate as follows.

When assembling the lifter shaft, first insert the lifter shaft into the end of the shaft hole, that is, at the position farthest from the mesh holding part, so that the sector gear corresponds to the drive gear, and then when the sector gear is meshed with the drive gear. By inserting the bushing between the lifter shaft and the shaft hole, the lifter shaft can be inserted and supported in a straight manner at the proper position of the shaft hole without the sector gear interfering with the mesh holding part.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Parts corresponding to those in the conventional example shown in FIGS. do.

In this example, the shaft hole 4 is formed into a so-called burring hole that can come into contact with the surface of the lifter shaft 5 in the circumferential direction, that is, a shape in which a boss portion 4a protrudes inside the base frame 2, and its inner diameter R is Compared to the outer diameter r of the lifter shaft 5, the engagement holding portion 1
8 and the sector gear 10 are set to be larger than the overlapping amount a (R-r>a), and the lifter shaft 5 is inserted through the large-diameter shaft hole 4 via a metal bushing 19 and is pivotally supported. . In this case, R-
r≧a may be satisfied.

Further, the tip of the lifter shaft 5 has a threaded portion 5b.
is formed, and a nut 20 is screwed onto this threaded portion 5b. This prevents the lifter shaft 5 from coming off, and when the bush 19 butts against the sector gear 10, the nut 20 is inserted between the sector gear 10 and the nut 20. Therefore, the lifter shaft 5 and the bush 19 are integrated, and the bush 19 is rotated within the shaft hole 4 when the sector gear 10 rotates.

Further, in this example, the teeth at the end portion of the sector gear 10 are buried, that is, the end portion 10a of the sector gear 10 has a shape having no teeth. The above rotation is prevented, that is, sector gear 1
0 itself functions as a rotation stopper.

In the configuration of this example, by forming the inner periphery of the shaft hole 4 into a rough surface, the bush 19 is stably supported in the shaft hole 4, so that the lifter shaft 5 can be rotated smoothly.

When assembling the lifter shaft 5 in the seat lifter of this example configured as described above, first insert the lifter shaft 5 into the rear end of the shaft hole 4, that is, at the position farthest from the mesh holding part 18, and then attach the sector gear. 10 to correspond to the drive gear 11 (see the two-dot chain line in FIG. 1), and then when the sector gear 10 is meshed with the drive gear 11, insert the bush 19 from the outside of the base frame 2 into the shaft hole 4 from the tip of the lifter shaft 5. By inserting the lifter shaft 5, the lifter shaft 5 is assembled into the proper position via the bush 19, and finally the threaded portion 5 at the tip of the lifter shaft 5 is inserted.
Screw the nut 20 onto b.

As described above, according to the structure of this example, the inner diameter R of the shaft hole 4 is formed to be larger than the overlapping amount a between the mesh retaining portion 18 and the sector gear 10 compared to the outer diameter r of the lifter shaft 5, so that the sector gear 10 is meshed. Since the lifter shaft 5 can be inserted straight into the shaft hole 4 and the sector gear 10 can be meshed with the drive gear 11 without interfering with the holding part 18, there is no need for extra man-hours such as rotating the handle as in the conventional case. Smooth assembly is performed, which improves workability and improves production efficiency.

Furthermore, as shown in this embodiment, the sector gear 10
It is also possible to easily assemble the terminal portion 10a having a shape in which the teeth are filled.

Moreover, in this example, the shaft hole 4 is a so-called burring hole, and the bush 19 integrated with the lifter shaft 5 is rotated within this shaft hole 4, so that the surface contact between the shaft hole 4 and the bush 19 is ensured. This improves the wear resistance of the shaft hole 4 and suppresses backlash compared to the conventional structure in which the lifter shaft 5 is inserted through a simple hole.

In the above embodiment, the shaft hole 4 is formed into a so-called burring hole, that is, a shape with a protruding boss portion 4a, but instead of this, a cylindrical body corresponding to the boss portion is fixed. Good too.

Moreover, as a rotation operation mechanism of the drive gear 11,
Wind regulator type friction brake device 12
The present invention is not limited to this, and various rotation adjustment devices using gear mechanisms, screw mechanisms, etc. can be applied.

Further, in this example, the lifter mechanism is disposed on the base frame 2 on the fixed side, but the relationship may be reversed, that is, the lifter mechanism may be disposed on the seat frame 1a on the movable side.

[Effect of idea]

As described above, according to the present invention, the lifter shaft can be inserted into the shaft hole and the dector gear can be meshed with the drive gear without the sector gear interfering with the mesh holding part. The number of man-hours can be saved, and therefore the assembly workability is improved and the production efficiency is improved.Also, even a sector gear having a shape in which the teeth at the end portion of the sector gear are filled can be easily assembled.

[Brief explanation of drawings]

FIG. 1 is a side view of the main parts showing an embodiment of the present invention;
Figure 2 is an exploded perspective view of the same, Figure 3 is A- of Figure 1.
4 is a side view showing a conventional example, and 5 is a sectional view taken along line A.
The figure is an exploded perspective view of the same. In the figure, 1 is a seat, 1a is a seat frame, 2 is a base frame, 4 is a shaft hole, 5 is a lifter shaft, 10 is a sector gear, 11 is a drive gear, 12 is a brake device as a rotation operation mechanism, and 18 is a meshing retention Part 19 is Bushiyu.

Claims (1)

[Claims for Utility Model Registration] The seat frame is inserted into a shaft hole formed on either one of the fixed side base frame and the movable side seat frame, and is supported by the shaft through the shaft hole, and the rotation of the shaft hole causes the above seat frame to be connected via a link mechanism. a lifter shaft that moves up and down with respect to the base frame; a sector gear that is fixed to the lifter shaft; and a sector gear that is pivotally supported by the frame on which the lifter shaft is attached, meshes with the sector gear, and is rotationally driven by a rotational operation mechanism. a driving gear, and a meshing holding part for preventing the sector gear from coming off is formed near the shaft support of the driving gear so as to cover a side surface of the meshing part of the sector gear and the driving gear. In the seat lifter, the shaft hole is formed to have a diameter larger than the diameter of the lifter shaft by at least an amount of overlap between the mesh holding part and the sector gear, and the lifter shaft is inserted into the large diameter shaft hole via a bush. A seat lifter characterized by being pivoted.