JP2624780B2 - Reclining device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention employs a differential reduction mechanism that supports an internal gear and an external gear having different numbers of teeth with an eccentric shaft and swings by rotating the eccentric shaft. And
The present invention relates to a reclining device that makes a seat of an automobile suitable.

[Conventional technology]

As a reclining device employing a differential damping reduction mechanism, for example, a device disclosed in Japanese Patent Publication No. 61-32171 is known. As shown in FIG. 5, in the conventional reclining device, a part of the internal gear a is formed integrally with a bracket b fixed to the seat cushion side, and a part of the external gear c is formed integrally with the back side bracket d by welding or the like. Has been done, and
The internal gear a and the external gear c are partially supported by an eccentric shaft e so as to be able to swing and rotate while always meshing.

Therefore, when the eccentric shaft e is rotated, the relative position of the two brackets b and d changes steplessly by an angle corresponding to the difference in the number of teeth between the internal gear a and the external gear c, and the reclining adjustment is performed. Has become.

[Problems to be solved by the invention]

In the above-mentioned conventional reclining device, the internal gears and the external gears a and c are partially fixed to the brackets b and d by welding or the like. It was easy to break, and it was necessary to devise a special measure to improve the strength.

[Means for solving the problem]

In view of such circumstances, the present invention, in order to eliminate this problem, an external gear and an internal gear having a slightly larger number of teeth than the external gear are supported by an eccentric shaft having an eccentric part, and the rotation of the eccentric shaft is accompanied by In a reclining device employing a differential reduction mechanism capable of relatively oscillating rotation in a state where the outer gear and the inner gear are always partially meshed with each other, each of the gears has It is characterized in that the bracket is fixed along the circumference and the fixing portion has a clamping structure, which is provided for the purpose of preventing the gears from being disengaged and improving the impact load.

〔Example〕

Hereinafter, the present invention will be described in detail based on one embodiment shown in FIGS.

The external gear 1 is attached and fixed with three rivets 3 along a bracket 2 fixed all around to the seat back side of the seat. The integrated external gear 1 and the shaft hole 4 of the bracket 2 are The bearing 5 is fitted, and the shaft hole 4
Three substantially arc-shaped long holes 6 penetrating on a radius concentric with
Are drilled. Reference numeral 7 denotes an internal gear having a slightly larger number of teeth than the external gear 1 and partially meshing with the external gear 1 at all times. A bearing 10 is fitted in a shaft hole 8 of the internal gear 7 via a bush 9. . Further, three substantially arc-shaped penetrating long holes 11 are formed on a radius concentric with the shaft hole 8 so that the head of the rivet 3 for fixing the external gear 1 and the bracket 2 can be loosely fitted and moved without any trouble. It has become. The internal gear 7 is provided with a stepped rivet 12 which is loosely fitted in three long holes 6 provided in the external gear 1 and the integrated bracket 2, and the seat cushion of the seat is sandwiched between the integrated external gear 1 and the bracket 2. It is fixed to the bracket 13 on the side. That is, the external gear 1 and the bracket 2 are connected to the eccentric shaft 14 by the internal gear 7 and the bracket 13.
, And is set so that the meshing portion between the external gear 1 and the internal gear 7 is located inside the pinched state. The bracket 13 has a bush 15
Are fixed, and a bearing 16 is fitted on the bush 15.

The eccentric shaft 14 is formed integrally with an eccentric portion 14a at the center,
The eccentric part 14a is fitted into the bearing 5 and the eccentric shaft 1
Shafts at both ends of 4 are fitted into bearings 10 and 16, respectively. Therefore, when the eccentric shaft 14 is rotated, the external gear 1 and the bracket 2 are swung relative to the internal gear 7 and the bracket 13 in a direction orthogonal to the eccentric shaft 14 according to the difference in the number of teeth. Therefore, with the rotation of the eccentric shaft 14, the external gear 1 is oscillated around the eccentric shaft 14 while partially meshing with the internal gear 7.

Reference numeral 17 denotes a synthetic resin gear, which is attached to an end of an eccentric shaft 14 protruding from the bracket 13,
The rotational output of the electric motor 18 fixed to the bracket 13 is transmitted to the eccentric shaft 14 via the gear 17 at a reduced speed. 19 is an internal gear 7 by the stepped rivet 12.
Is a cover plate integrally fixed to the side surface of the cover.

[Action]

According to the present invention, when the eccentric shaft 14 to which the gear 17 is mounted is rotated by the motor 18 via the gear 17 as is apparent from the above configuration, the bracket 2 and three places are integrally fixed by rivets by the eccentric portion 14a. The external gear 1 is the internal gear 7
And the bracket 13, and is oscillated about the eccentric portion 14 a while always meshing with a part of the internal gear 7. For this reason, when the eccentric shaft 14 makes one rotation, the meshing portion between the external gear 1 and the internal gear 7 also moves in the same direction as the eccentric shaft 14 along the tooth portions of both gears and makes one revolution. Then, the external gear 1 is rotated relative to the internal gear 7 in the rotation direction of the eccentric shaft 14 by the difference in the number of teeth between the two gears. That is, when the eccentric shaft 14 is rotated by the motor 18, the bracket 2 fixed to the external gear 1 and the internal gear 7
The relative angle between the eccentric shaft 14 and the bracket 13 fixed via the stepped rivet 2 turns in proportion to the rotation speed of the eccentric shaft 14 and is adjusted steplessly.

Note that, within the range of normal reclining adjustment, the head of the rivet 3 for fixing the external gear 1 and the bracket 2 moves in the three long holes 11 of the internal gear 7 without any trouble. The three rivets 12 for fixing the rivet 12 and the bracket 13 move in the three long holes 6 provided in the external gear 1 and the bracket 2 without any trouble. I have. Further, when the limit of the reclining adjustment is reached, the rivet or the head of the rivet simultaneously comes into contact with one end of each of the long holes, and functions as stopper means for regulating the adjustment range.

The bracket 2 and the internal gear 7 integrated with the external gear 1
Has three holes that penetrate it to reduce weight.

〔The invention's effect〕

As is apparent from the above description, in the reclining device of the present invention, the external gear fixed to the bracket has an internal gear, and the sandwich holding structure is formed by the bracket to which the internal gear is fixed. The outer gear and the internal gear have an advantageous structure in terms of strength without the impact load and the twist load for fixing the outer gear and the inner gear to the respective brackets along the entire circumference at one point.

[Brief description of the drawings]

1 to 4 are views showing an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. Front view showing attached state, FIG.
The figure is a front view showing the internal gear 7. FIG. 5 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... External gear, 2 ... Bracket, 3 ... Rivet, 4 ... Shaft hole, 7 ... Internal gear, 12 ... Rivet, 13 ... Bracket, 14 ...
Eccentric shaft, 14a ... Eccentric part

Continuation of the front page (72) Inventor Nobomasa Kito No. 1, Kakihata, Inuyama-shi, Aichi Prefecture Inside Imasen Electric Works, Ltd. JP, U) Japanese Utility Model Showa 63-5842 (JP, U)

Claims (1)

(57) [Claims] 1. An external gear and an internal gear fixed to a bracket on a seat cushion side and a seat back side of a seat, respectively, wherein said external gear and an internal gear having slightly more teeth than the external gear are eccentric. Supported by an eccentric shaft having a portion,
In a reclining device employing a differential reduction mechanism that is relatively oscillated and rotated while the external gear and the internal gear are always partially meshed with the rotation of the eccentric shaft, the reclining device is fixed to the bracket. A reclining device wherein an external gear is sandwiched between an internal gear and a bracket to which the internal gear is fixed.