JP2545073Y2 - knuckle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knuckle constituting a reclining device for a vehicle, and more particularly to an improvement of a so-called Taumel knuckle.

[0002]

2. Description of the Related Art Generally, in a vehicle, a seat is provided with a reclining device, and a seat back is tilted with respect to a seat cushion to ensure comfort when seated.

For example, as this type of reclining device, an eccentric portion is formed on an operating shaft, and one of an external gear or an internal gear is externally supported on an eccentric portion of the operating shaft, and the other is externally supported on a non-eccentric portion of the operating shaft. The lower bracket having the external gear is fixed to the seat bottom, the upper bracket having the internal gear is fixed to the seat back, and the external gear and the internal gear are rotated by rotating the operation shaft. There is known an apparatus in which an engagement position is set to tilt a seat back with respect to a seat cushion (for example, see Japanese Utility Model Application Laid-Open No. 61-131953).

[0004]

However, in the conventional taumel-type bearing, the external gear and the internal gear are stamped and formed on the lower bracket and the upper bracket. Therefore, as shown in FIG. An offset t occurs between the load point A of the external gear 513 and the mesh point B of the external gear 56 and the internal gear 59, and a bending moment acts on the operation shaft 513 to generate “twisting”. There is a problem that frictional resistance between the tooth gear 56 and the internal gear 59 is large, and it is difficult to secure knuckle power.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a knuckle capable of increasing the knuckle power by reducing "twisting" of an operation shaft.

[0006]

Therefore, a knuckle according to the present invention is constructed by externally supporting one of an external gear or an internal gear on an eccentric portion of an operation shaft and the other on an eccentric portion of the operation shaft. A knuckle of a reclining device configured to set a meshing position between the external gear and the internal gear by rotation of the operation shaft and to tilt the seat back with respect to a seat cushion; The gist is that a step is formed around the support hole of the operation shaft of the tooth gear so that the load point of the operation shaft substantially matches the mesh point of the external gear and the internal gear.

[0007]

In the present invention, a step is formed in the external gear and the internal gear so that the load point of the operating shaft and the meshing point of the external gear and the internal gear substantially coincide with each other. The bending moment acting on the operating shaft is small, and almost no "twisting" occurs on the operating shaft. As a result, the frictional resistance between the operation shaft and the external gear and the internal gear is reduced, and the knuckle power is increased.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to specific examples shown in the drawings. 1 to 3 show a knuckle according to an embodiment of the present invention. In the figure, a vehicle seat 1 includes a seat cushion 2 and a seat back 3, a headrest 4 is provided at an upper end of the seat back 3, and a reclining is provided between the seat cushion 2 and the seat back 3. The device 5 is provided and the seat back 3 is provided.
Can be tilted with respect to the seat cushion 2.
A slider mechanism 6 is provided between the bottom surface of the seat cushion 2 and the passenger compartment floor, whereby the front and rear positions of the seat 1 can be adjusted.

The structure of the reclining device 5 will now be described. A lower bracket 50 is fixed to the seat cushion 2 by inserting a mounting bolt or the like into a hole 51 on a lower side thereof. A bracket 52 is fixed by inserting a mounting bolt or the like into a hole 53 on the upper side.

A connecting pin 54 is attached to the lower bracket 50.
The external gear 55 is connected to the upper bracket 52 by a connecting pin 57 and the internal gear 58 is connected to the upper bracket 52.
17, the external gear 55 and the internal gear 58 are supported between the lower bracket 50 and the upper bracket 52.

An external gear 56 is formed on the external gear 55 by stamping and, at the same time, a concave portion corresponding to the external gear 56 is formed on the opposite side, and the internal gear 58 is formed by punching. The internal gear 59 is formed and at the same time, on the opposite side, the internal gear 59
Are formed. The pitch of the internal gear 59 is set equal to the pitch of the external gear 56, and the pitch circle diameter of the internal gear 59 is set to be larger than that of the external gear 56.

The External gear 55 and the internal gear 58 have a shaft support hole 5 at the center of the gear.
10 and 511 are formed.
An operation shaft 513 is rotatably inserted into and supported by the fifth shaft support hole 510. An eccentric portion 514 is formed on the operation shaft 513, and the eccentric portion 514 of the operation shaft 513 is inserted into and supported by the shaft support hole 511 of the internal gear 58. In addition, in order to further increase the knuckle power,
The shaft support holes 510 of the operation shafts 513 and 514 and the external gear 55 and the shaft support hole 51 of the internal gear 58
1 may be provided with a bearing.

The operating shaft 513 has a pulley 515
The pulley 515 is connected to the shaft of a drive motor by a chain or the like (not shown), so that the meshing position between the external gear 56 and the internal gear 59 is set, and Are tilted with respect to the seat cushion 2.

Further, the external gear 56 and the internal gear 5
9 has steps 518, 5 around the shaft support holes 510, 511.
19 is formed, whereby the load point A of the operation shaft 513 is formed.
And the meshing point B of the external gear 56 and the internal gear 59 substantially coincide with each other.

Next, the function and effect will be described.

When adjusting the inclination angle of the seat back 3, the drive motor is driven to rotate the operation shaft 513.
Then, since the non-eccentric portion of the operation shaft 513 is supported by the shaft support hole 511 of the external gear 55 on the seat cushion 2 side, which is a fixed point, the position of the center line of the non-eccentric portion of the operation shaft 513 does not change. The eccentric portion 514 of the operating shaft 513 revolves around the center line of the non-eccentric portion while rotating around its own center line, and the upper bracket 52 tilts accordingly, and the internal gear 59 and the external gear 56 are tilted.
And the meshing position of the seat cushion 2 changes.
The inclination angle of the seat back 13 with respect to is adjusted.

In the knuckle of this embodiment as described above, steps 518 and 519 are formed in the external gear 56 and the internal gear 59, and the load point A of the operating shaft 513 and the external gear 56 and the internal gear 59 Since the meshing point B was made to substantially match,
The bending moment acting on the operation shaft 513 is extremely small, and “prying” of the operation shaft 513 can be greatly reduced.
As a result, the operation shaft 513, the external gear 56 and the internal gear 5
9 can be reduced, and knuckle power can be greatly increased.

In the knuckle of this embodiment, the operation shaft 5
As a result, it is possible to significantly increase the strength of the structure.

Here, the knuckle of this embodiment was measured for knuckle power and strength, and compared with a conventional knuckle, it was confirmed that the knuckle power was increased by 50% and the knuckle power was increased by 20%.

[0020]

As described above, according to the knuckle according to the present invention, one of the external gear and the internal gear is externally supported on the eccentric portion of the operating shaft, and the other is externally supported on the non-eccentric portion of the operating shaft. A knuckle for a reclining device, wherein the engagement position between the external gear and the internal gear is set by rotating the operation shaft to tilt the seat back with respect to the seat cushion. And a step is formed around the support hole of the operation shaft of the internal gear, so that the load point of the operation shaft substantially coincides with the mesh point of the external gear and the internal gear. There is an effect that knuckle power and strength can be increased by reducing the knuckle power.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a vehicle seat provided with a knuckle according to an embodiment of the present invention.

FIG. 2 is a side view showing the knuckle.

FIG. 3 is a sectional view of a main part showing the knuckle.

FIG. 4 is a diagram for explaining a problem to be solved by the present invention.

[Explanation of symbols]

 2 Seat cushion 3 Seat back 5 Reclining device 56 External gear 59 Internal gear 513 Operating shaft 514 Eccentric part 7 Bearing 70 Housing 71 Needle

Claims (1)

(57) [Scope of request for utility model registration] 1. One of an external gear 56 and an internal gear 59 is provided on an eccentric portion 514 of an operation shaft 513, and the other is provided on the operation shaft 51.
3 are externally supported on the non-eccentric portions of the external gear 56 and the internal gear 59 by the rotation of the operation shaft 513.
In the knuckle of the reclining device 5 in which the seat back 3 is tilted with respect to the seat cushion 2 by setting the meshing position of the external gear 56 and the internal gear 59 around the support hole of the operation shaft 513. Steps 51
Knuckles 8 and 519 are formed, and a load point A of the operation shaft 513 substantially coincides with a mesh point B of the external gear 56 and the internal gear 59.