JPH0533Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement in a reclining device in which the tilting position of a seat back relative to a seat cushion can be adjusted by skillfully utilizing a planetary gear mechanism.

[Conventional technology]

For example, in vehicle seats, it is common practice to provide a reclining device between a seat cushion and a seat back so that the seat back can tilt relative to the seat cushion.
In this way, the seat can be freely adjusted according to the body shape and preference of the person sitting on the seat.
By the way, what is required of this type of reclining device is that it not only has a simple configuration, is excellent in terms of workability and assembly of each part, is inexpensive, but also allows the seat back to be adjusted freely and appropriately. It is possible to adjust the tilt at a certain angle, and the adjustment operation is extremely easy with no rattling and with a light operating force, and the locked state is reliably maintained against the load of the seated person. It is possible. Taking these points into consideration, various configurations have been proposed in the past, one of which has the advantage of making stepless rotation adjustment possible by skillfully utilizing a planetary gear mechanism. For example, reclining devices that perform
-It was known from Publication No. 187646, etc.

[The problem that the idea attempts to solve]

However, in a reclining device that employs such a planetary gear mechanism, a holding body is used to maintain a state in which the plurality of planetary gears are meshed with the internal teeth of the base plate and the arm plate by holding them at predetermined orbital positions. Traditionally,
A plate body made of a metal plate exhibiting an approximately star shape is used, and the planetary gear is held in its recessed part and meshed with the internal toothed part of the plate, so that by repeatedly adjusting this device, Wear occurs in planetary gears, etc., and the amount of rattling gradually increases over time. When such rattling occurs, it not only impairs durability and causes abnormal noises, but also causes problems in operation, making it impossible to demonstrate its performance as a reclining device. . In particular, such a problem is significant when the reclining adjustment operation is performed under a load condition in which a load is applied to the seat back side.

Furthermore, with the conventional structure using such a plate-shaped holder, due to the above-mentioned problems such as wobbling, not only a large amount of operating force is required when adjusting the rotation, but also a rotation that feels strange. This is a manual operation, which poses a problem in terms of operability. In particular, such a plate-shaped holder maintains the orbital position of each planetary gear by locking and holding the inward portion thereof, and also acts on each planetary gear that meshes with the internal teeth when locked. It is necessary to prevent movement of the load in the centripetal direction, and also to protect the control gear as a sun gear from this load. Taking these points into consideration, the conventional retaining plate described above was developed. It is hoped that some kind of measure will be taken to eliminate the problems that the body has.

[Means to solve the problem]

In order to meet such demands, the reclining device according to the present invention includes a plurality of planetary gears that mesh with the internal teeth of the base plate and the arm plate, and mesh with control gears provided on the rotation shafts of both plates. The holding body that holds the planetary gears at the orbital position is divided into a plurality of parts so that the parts holding each planetary gear face in the radial direction, and
The portions that hold these divided holding bodies are formed into a tapered surface shape that becomes smaller in diameter toward one side in the axial direction,
Further, a biasing means for biasing the rotating shaft toward the small diameter portion thereof is provided.

[Effect]

According to the present invention, each planetary gear is held by a holder held by a tapered surface portion on the rotating shaft.
The internal teeth of each plate are meshed and held without any play, and even if these planetary gears are worn out, the rotating shaft will be fixed according to the amount of play caused by the wear. By moving by means of force,
The large diameter portion of the tapered surface portion moves each divided holder in the radial direction, making it possible to hold each planetary gear so that it always meshes with the internal teeth on the plate side. The relative rotational angle position of both plates can be adjusted steplessly by suppressing the rattling problem caused by wear on the planetary gear, and rotating it using the control gear on the rotating shaft that meshes with the planetary gear. Moreover, when this rotational operation is stopped, both plates can be locked using a locking structure using a planetary gear mechanism.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIGS. 1 to 3 show an embodiment of the reclining mechanism according to the present invention. In these figures, the reclining mechanism, which is generally designated by the reference numeral 10, includes a seat cushion and a seat back (both of which constitute the seat). A base plate (hereinafter referred to as a base) 11 and an arm plate (hereinafter referred to as an arm) 12 are provided as a pair of plates that are respectively attached to a base plate (not shown). Internal teeth portions 13 and 14 are formed in the base 11 and the arm 12 in circular holes facing each other on the same axis (on the shaft support of the seat). In this case, in this embodiment, the internal tooth portions 13 and 14 are formed to have the same addendum circle and different numbers of teeth.

Reference numeral 15 designates a plurality of (four in this embodiment) planetary gears each having teeth formed in the axial direction to mesh with the internal teeth 13 and 14, respectively, and one side of each of the teeth in the axial direction is shown in FIG. As is clear from the above, the structure is such that it meshes with the internal tooth portions 13 and 14 having different numbers of teeth as described above. A control gear 16, which meshes with the respective teeth and becomes a sun gear, is located in the center of these four planetary gears 15, and is connected to a rotating shaft 17 on the same axis as the internal gears 13 and 14 on the plate side.
It is arranged in a state where it is pivotally supported by. The above-mentioned control gear 16 may be provided integrally or integrally with the rotating shaft 17, and although not shown, an operating knob for manual operation or an internal control knob may be provided on the outer end side of the rotating shaft 17. Needless to say, by providing a drive source such as an electric motor for automatic adjustment on one end side, the structure can be configured such that necessary reclining adjustment operations can be performed.

Now, according to the present invention, in the reclining device 10 configured as described above, the base 1
A plurality of planetary gears 15 are held at predetermined orbital positions, respectively, and mesh with the internal teeth 13 and 14 of the arms 12 and 1, and the control gears 16 provided on the rotation shafts 17 of these members 11 and 12. As shown in FIGS. 1 and 2, the holding body 20 for holding each planetary gear 15 is formed by being divided into a plurality of parts (divided into two in this embodiment) so that the parts holding each planetary gear 15 face in the radial direction, and these parts are divided into two parts. Split holding bodies 20a, 20b
The holding portion is formed as a tapered surface portion 21 that becomes smaller in diameter toward one side in the axial direction, and the rotating shaft 17 is formed on the small diameter portion side of the tapered surface portion 21 (in the direction of the arrow in FIG. 1). ) is provided with a disc spring 22 as a biasing means.

According to such a configuration, each planetary gear 15 is held inside each plate 11, 12 by the holder 20, 20a, 20b held by the tapered surface portion 21 on the rotating shaft 17. The teeth 13 and 14 are meshed and held without any play, and even if these planetary gears 15 are worn out, the rotating shaft 1 is adjusted according to the amount of play caused by the wear.
7 is moved by the urging means, the large diameter portion of the tapered surface portion 21 is moved by the respective divided holders 20a, 20b.
can be moved in the radial direction. Therefore, each planetary gear 15 is always connected to its respective plate 11,
It is possible to hold the planetary gear 15 in mesh with the internal teeth 13 and 14 on the 12 side, thereby suppressing the rattling problem caused by wear etc. that occurs in the conventional planetary gear 15. Upper control gear 1
6, the relative rotational angle position of both plates can be adjusted steplessly, and when this rotation operation is stopped, both plates 11 and 12 are locked by a locking mechanism using a planetary gear mechanism. It's something you get.

In particular, according to the present invention, compared to conventional products, it is possible to cope with the increase in the number of necessary parts by adding a biasing means such as a disc spring 22 to the minimum required number, which is advantageous in terms of cost.

Here, in the above-mentioned embodiment, the case where the holding body 20 is divided into two parts is illustrated, but the present invention is not limited to this,
In short, as long as it has a split shape that can hold each planetary gear 15 in a state where it can be meshed with the internal gears 13 and 14, the third
Needless to say, the structure may be divided into four parts as shown in the figure.

It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape and structure of each part may be modified and changed as necessary. For example, in the embodiment described above, the disc spring 22 is used as an example of the biasing means for biasing the rotary shaft 17, but it will be easily understood that appropriate modifications can be made.

Further, in the above-described embodiment, a case has been described in which the teeth of the planetary gear 15 mesh with the internal teeth 13 and 14 having the same addendum circle and different numbers of teeth, but the present invention is not limited to this. First, each gear portion 13 described above,
The number of teeth (14, 15, 16) and the size of the addendum circle may be selected as necessary, and the number of planetary gears 15, etc. may also be freely selected, and various modifications can be considered. Also,
The reclining device according to the present invention can be effectively applied to a vehicle seat, but is of course not limited thereto.

[Effect of idea]

As explained above, according to the reclining device according to the present invention, the plurality of planetary gears that mesh with the internal teeth of the base and the arm and mesh with the control gear provided on the rotation shafts of these plates, respectively. The holding body that holds the planetary gears at the orbital position is divided into a plurality of parts so that the parts holding each planetary gear face in the radial direction, and the parts holding these divided holding bodies are formed so that they face toward one side in the axial direction. In the past, each planetary gear was formed into a tapered surface having a small diameter, and a biasing means for biasing the rotating shaft toward the small diameter side was provided. The holder held by the tapered surface portion on the shaft can mesh and hold the internal teeth of each plate without rattling, and even if used for these planetary gears, it will not wear out. Even if such problems occur, by moving the rotating shaft using the urging means according to the amount of wobbling caused by the wear, etc., each divided holding body can be pressed in the radial direction by the large diameter portion of the tapered surface portion. This allows each planetary gear to always be held in mesh with the internal teeth on the plate side, thereby suppressing the rattling problem caused by wear etc. that occurs with conventional planetary gears. , it has various excellent practical effects such as being able to improve durability and operational reliability.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a main part showing an embodiment of the reclining mechanism according to the present invention, and Fig. 2 shows an arm with which a planetary gear is arranged to mesh with a control gear, which is the main part, and an inner part of the base side. FIG. 3 is an enlarged sectional view showing an enlarged tooth portion, and FIG. 3 is a schematic exploded perspective view showing a modification of the present invention. In the figure, 10... reclining mechanism, 11...
Base (plate), 12... Arm (plate), 13, 14... Internal gear, 15... Planetary gear,
16... Control gear, 17... Rotating shaft, 20... Holding body, 20a, 20b... Divided holding body, 21...
Tapered surface portion, 22... disc spring (biasing means).

Claims (1)

[Scope of utility model registration request] A base plate and an arm plate that are rotatably supported on the same axis and have internal teeth in opposing circular holes; a plurality of planetary gears that have teeth that mesh with the internal teeth of each of these plates; A rotating shaft of both plates having a control gear that meshes with the teeth of the planetary gear, and a holding body that is fitted onto the rotating shaft and holds each of the planetary gears at a predetermined orbital position. This holding body is formed by dividing it into a plurality of parts so that the parts holding each planetary gear face in the radial direction, and the parts holding these divided holding bodies face toward one side in the axial direction to have a small diameter. What is claimed is: 1. A reclining device, characterized in that the reclining device is formed in a tapered surface shape and includes a biasing means for biasing the rotating shaft toward a smaller diameter portion thereof.