JP2624781B2 - Reclining device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention employs a differential damping 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, the conventional reclining device has an internal gear 1 formed integrally with a bracket 2 fixed to the seat cushion, and an external gear 3 formed integrally with a bracket 4 fixed to the seat cushion. The internal gear 1 and the external gear 3 are partially supported by the eccentric shaft 5 so as to be able to swing and rotate while always meshing.

Therefore, when the eccentric shaft 5 is rotated, the relative positions of the two brackets 2 and 4 change steplessly by an angle corresponding to the difference in the number of teeth between the internal gear 1 and the external gear 3, so that reclining adjustment is performed. Has become.

[Problems to be solved by the invention]

In the above conventional reclining device, the eccentric shaft 5
Thus, the internal gear 1 and the external gear 3 that are pivotally supported are indirectly and partially sandwiched by the bearing bracket 6, the pin 7 with the flange, and the bush 8 with the flange. For this reason, it is not possible to reliably prevent any one of the eccentric shaft 5 and the backlash between the internal gear 1 and the external gear 3 in the axial direction (horizontal direction). However, there has been a problem that the meshing portion is displaced, and a problem that smooth operation cannot be performed easily occurs.

When a small and high-speed motor is used as a drive source, it is advantageous to increase the number of teeth by increasing the size of both gears. However, in the indirect and partial clamping structure as in the conventional reclining device described above, when the gears are enlarged, even a slight shift between the two gears results in a large shift at the meshing portion of the tooth tip, and the meshing portion is easily opened and further easily displaced. There were problems such as a decrease.

[Means for solving the 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 portion, and the external gear and the internal gear are always partially meshed with the rotation of the eccentric shaft. In a reclining device that employs a differential reduction mechanism capable of relatively swinging rotation in a state, a plurality of long holes are drilled in one gear on the same radius, and rivets loosely fitted in the long holes. And the like, wherein the other gear and the bracket are fixed while the one gear is held therebetween.

〔Example〕

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

The external gear 10 is mounted and fixed with three rivets 12 on a bracket 11 which is fixed all around the seat back side of the seat.
A bearing 14 is fitted in the hole, and three substantially arc-shaped long holes 15 are formed in a radius concentric with the shaft hole 13.
An internal gear 16 has slightly more teeth than the external gear 10 and partially meshes with the external gear 10.
A bearing 19 is fitted via 18. Furthermore, the shaft hole
Three substantially arc-shaped long holes 20 are formed on a radius concentric with 17. The internal gear 16 is the three of the external gear 10 and the bracket 11.
The integrated external gear 10 and bracket 11 are fixed to a bracket 22 on the seat cushion side of the seat by a stepped rivet 21 loosely fitted in the two long holes 15. In other words, the external gear 10 and the bracket 11 are
22 and the external gear 10
The internal gear 16 and the internal gear 16 are set so as to be located inside the pinched portion. A bush 23 is fixed to the bracket 22, and a bearing 24 is fitted on the bush 23.

25 is an eccentric part in which an eccentric part 25a is integrally formed in the center,
The eccentric portion 15a is fitted into the bearing 14, and the coaxial portions at both ends of the eccentric shaft 25 are fitted into the bearings 19 and 24, respectively. Therefore, when the eccentric shaft 25 is rotated, the external gear 10 and the bracket 11 are swung relative to the internal gear 16 and the bracket 22 in a direction orthogonal to the eccentric shaft 25 according to the difference in the number of teeth. For this reason, with the rotation of the eccentric shaft 25, the external gear 10 is oscillated around the eccentric shaft 25 while partially meshing with the internal gear 16.

26 is a synthetic resin gear, which is attached to the end of an eccentric shaft 25 protruding from the bracket 22,
The rotational output of the electric motor 27 fixed to the bracket 22 is transmitted to the eccentric shaft 25 via the gear 26 at reduced speed. A cover plate 28 is integrally fixed to the side surface of the internal gear 7 by the rivet 21.

In the above-described configuration, the bearings 14, 19, and 24 are for causing a frictional force between the eccentric shaft 25 and each gear and the bracket, and even when each bearing is omitted, the eccentric shaft is rotated by the frictional force. Only the required torque increases, and the operation as the reclining device does not change.

[Action]

According to the present invention, as is apparent from the above configuration, when the eccentric shaft 25 to which the gear 26 is mounted is rotated by the motor 27, the external gear 10 is kept in mesh with a part of the internal gear 16 by the eccentric portion 25a. Oscillates around the eccentric part 25a. For this reason, when the eccentric shaft 25 makes one rotation, the meshing portion between the external gear 10 and the internal gear 16 also moves in the same direction as the eccentric shaft 25 along the teeth of both gears and makes one revolution. Then, the internal gear has the number of teeth difference between the two gears.
The external gear 10 is rotated relative to 16 in the rotation direction of the eccentric shaft 25. That is, when the eccentric shaft 25 is rotated by the motor 27, the relative angle between the bracket 11 fixed to the external gear 10 and the bracket 22 fixed to the internal gear 16 is proportional to the rotation speed of the eccentric shaft 25. Adjusted in stages.

In addition, within the range of normal reclining adjustment, the head 12a of the rivet 12 for fixing the external gear 10 and the bracket 11 moves in the three long holes 20 of the internal gear 16 without any trouble. The positional relationship between the long holes and the rivets is set so that the three rivets 21 for fixing the bracket 16 and the bracket 22 move in the three long holes 15 provided in the external gear 10 and the bracket 11 without any trouble. ing. In addition, when the limit of the reclining adjustment is reached, each rivet or the head 12a 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 invention's effect〕

As is clear from the above description, in the reclining device of the present invention, one of the gears has a plurality of long holes formed on the same radius, and is fixed by a fixing means such as a rivet loosely fitted in the long holes. The outer gear and the bracket are sandwiched between the inner gear and the bracket in a sandwich structure because the one gear is held while the other gear is held, and the eccentric shaft of both gears is in the axial direction. (Horizontal direction) without any backlash
The meshing portions of the two gears are not displaced in the opening direction and are not deformed or damaged.

In addition, since the inner teeth and the outer teeth are provided with a plurality of long holes and are lightened, the weight can be reduced.

[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 16. FIG. 5 is a sectional view showing a conventional example. [Explanation of reference numerals] 10 ... external teeth, 16 ... internal gear, 11, 22 ... bracket, 15, 20 ... long hole, 12, 21 ... rivet, 25 ... eccentric shaft, 25a ... eccentric part

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobomasa Kito 1 Kakihata, Inuyama-shi, Aichi Pref. −191240 (JP, U)

Claims (2)

(57) [Claims] An external gear and an internal gear fixed to a seat cushion side and a seat back side of a seat, respectively, wherein the external gear and the internal gear having slightly more teeth than the external gear form an eccentric portion. Reclining adopting a differential reduction mechanism which is supported by an eccentric shaft having the eccentric shaft, and the outer gear and the inner gear are relatively oscillated and rotated with the rotation of the eccentric shaft in a state where the outer gear and the inner gear are always partially meshed. In the apparatus, one of the gears is provided with a plurality of long holes on the same radius, and the other gear and the bracket are held in a state where the one gear is clamped by fixing means such as rivets loosely fitted in the long holes. A reclining device, characterized in that the reclining device is fixed. 2. An end of an elongated hole formed in one of the gears is brought into contact with a fixing means such as a rivet loosely fitted to an end of the elongated hole, or is formed in the other gear. The range of reclining adjustment is restricted by the contact of the end of an elongated hole and fixing means, such as a rivet, which was loosely fitted in the elongated hole, The range of reclining adjustment is characterized by the above-mentioned. The reclining device as described.