JP2577950Y2 - Seat reclining device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat reclining device and, more particularly, to a mechanism for preventing idle rotation between an inner peripheral tooth portion and an outer peripheral tooth portion of a seat reclining device using a planetary gear reduction mechanism called a Taumel mechanism.

[0002]

2. Description of the Related Art In a Taumeru mechanism, an inner peripheral tooth portion and an outer peripheral tooth portion having a difference of one tooth mesh with each other, an eccentric shaft engaged with an outer peripheral tooth portion having an arm rotates, and an outer peripheral tooth portion has a base plate. Since the arm rotates at a predetermined angle about the eccentric axis by eccentric rotation with respect to the inner peripheral tooth portion, the arm is fixed to the seat back and the base plate is fixed to the seat cushion, and the seat of the vehicle seat is fixed. It is used as a seat reclining device for adjusting the inclination of the back in the front-back direction at a desired angle (for example, see Japanese Patent Publication No. 61-32171, Japanese Patent Application Laid-Open No. 63-255012, etc.).

For example, FIG. 9 shows an outer side (door side)
FIG. 10 is a sectional side view showing a conventional example of a seat reclining device using a taumel mechanism on the inner side (the center side of the vehicle body), in which a base plate 31 fixed to a seat cushion of a vehicle seat device has circular outer peripheral teeth. An inner gear plate 33 having a portion 32 formed thereon is connected, and an outer gear plate 35 having a circular inner peripheral tooth portion 34 meshed with the outer peripheral tooth portion 32 is connected to an arm 36 fixed to a seat back. A holder plate 37 is fixed to the arm 36 together with the outer gear plate 35 sandwiching the inner gear plate 33. The periphery of the holder plate 37 is pressed by the base plate 31.

[0004] The inner peripheral tooth portion 34 and the outer peripheral tooth portion 32 mesh with a difference of one tooth, and a shaft hole 34 formed in the center portion thereof.
a and bearing 37a of bearing 32a and holder plate 37
, A shaft 38 is rotatably inserted.
To the shaft 38, an appropriate knob (knob) for rotationally driving the shaft 38 or a gear 42 meshing with an output tooth portion of an electric motor with a reduction gear (not shown) is connected.

The shaft hole 34a and the bearing 37a are located at the center of the outer peripheral tooth portion 34, but the bearing 32a is inserted into the eccentric shaft hole. The shaft 38 has an eccentric shaft 38a fitted to the bearing 32a, and has an inner side (FIG. 1).
0), the cone portion 3 fitted into the shaft hole 34a and the bearing 37a
9,40. The inner peripheral surface of the bearing 37a and the shaft hole 34a with which the cone portions 39 and 40 are in sliding contact are formed as conical surfaces.

A disc spring 43 is mounted on an end of a shaft 38 having cone portions 39 and 40 with a washer 44 and a push nut 45. The disc spring 43 slides on the outer gear plate 35 to move the shaft 38 rightward in the drawing. Always pulling to.

[0007]

However, in a seat reclining apparatus using the above-described taumeul mechanism, the reclining is adjusted backward while a load is applied to the seatback, for example, a seated person leans against the seatback. In the case of doing, the idling phenomenon occurs between the inner peripheral tooth part and the outer peripheral tooth part, the seat back moves temporarily and not suddenly, causing the occupant to feel suspicious and the seat back to tilt sharply May make the seating sensation worse.

Accordingly, the present invention has been made to solve the above-mentioned idling phenomenon of a seat reclining device using a so-called taumel mechanism.

[0009]

A seat reclining device according to the present invention comprises an outer gear plate, an inner gear plate meshing with the outer gear plate with a predetermined number of teeth, and a center portion of the outer gear plate. In a seat reclining device having a Taumel mechanism comprising a shaft that penetrates and an eccentric shaft penetrates the center of the inner gear plate, a disc spring is fitted to an end of the shaft protruding from the outer gear plate. The outer peripheral edge is slid into contact with the outer gear plate, and a washer or bush that engages with the inner peripheral edge of the disc spring, or a bush that slides on the center of the disc spring and rotates together with the shaft is fitted. It is characterized by becoming.

[0010]

When rotational torque is input to the shaft, rotational force is transmitted to the washer or bush, and the washer or bush rotates the disc spring, and the sliding resistance between the outer gear plate and the outer peripheral edge of the disc spring abutting. To produce a braking effect.

Further, when a rotational torque is input to the shaft, the rotational force is transmitted to the bush, and a sliding resistance is generated between the bush and the disc spring to generate a braking effect.

Therefore, even if the reclining adjustment is performed in a state where a load is applied to the arm, the outer teeth are prevented from idling with respect to the inner teeth due to the braking effect.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a seat reclining device using a Taumel mechanism, FIG. 2 is a cross-sectional side view showing main parts on an outer side, and FIG. 3 is a cross-sectional side view showing main parts on an inner side. As shown in the drawing, an inner gear plate 3 having a circular outer tooth portion 2 is connected to a base plate 1 fixed to a seat cushion Sc of a vehicle seat device, and a circular inner gear meshing with the outer tooth portion 2 is formed. Outer gear plate 5 having peripheral teeth 4 formed
Is connected to the arm 6 which is fixed to the seat back Sb. 7
Is fixed to the arm 6 together with the outer gear plate 5 sandwiching the inner gear plate 3 with the holder plate.

The inner peripheral tooth portion 4 and the outer peripheral tooth portion 2 have at least one
The shaft 8 is rotatably inserted through the shaft hole 4a, the bearing 2a, and the bearing 7a of the holder plate 7, which are bored at the center thereof. A gear 17 that meshes with an output tooth portion of an electric motor (not shown) with a speed reducer or a suitable knob for rotating the shaft 8 is connected to the shaft 8.

Although the shaft hole 4a and the bearing 7a are located at the center of the inner peripheral tooth portion 4, the bearing 2a is inserted into the eccentric shaft hole. The shaft 8 has an eccentric shaft portion 8a fitted to the bearing 2a, and the inner seat reclining device shown in FIG. 3 has a shaft hole 4a and cone portions 9 and 10 fitted to the bearing 7a. The shaft hole 4a with which the cone portions 9 and 10 are in sliding contact and the inner peripheral surface of the bearing 7a are each formed in a conical surface.

At the end of the shaft 8, as shown in an enlarged view in FIG. 4, an irregular-shaped section 11 such as an oval shape is provided, and a bush 18 and a C-ring 19 are fitted and fixed to the shaft 8. A washer 13 that restricts the directional movement, fits a disc spring 12 on the outside thereof, and engages with the disc spring 12 to suppress it.
Is fitted to the end of the shaft 8, and the washer 13 is stopped by the push nut 14 so as not to fall off the shaft 8. The outer peripheral edge of the disc spring 12 is brought into sliding contact with the outer gear plate 5.

The washer 13 is, as shown in FIG.
The projections 13a, 13a, which enter the radial grooves 12b of the star-shaped holes 12a formed in the center of the disc spring 12, are formed at least in diametrical opposition so as to protrude on one surface on the disc spring 12 side. After attaching the spring 12 to the shaft 11,
When the washer 13 is mounted on the shaft 8, the projections 13 a, 13 a enter the radial grooves 12 b, 12 b so that they can be engaged. The washer 13 is provided with an oval shaped hole 13b into which the deformed section 11 of the shaft 8 is fitted.

The outer gear plate 5 is rotatably pressed by the base plate 1, and the holder plate 7 is slidably sandwiched by guide pins 16 fixed to the base plate 1. The shafts 8, 8 are connected by an interlocking rod or the like so that the outer seat reclining device (FIG. 2) and the inner seat reclining device (FIG. 3) can be interlocked.

Therefore, if a torque is applied to the shaft 8 manually or electrically, the gear 17 rotates and the inner gear plate 3 is fixed to the base plate 1.
The shaft 8 rotates eccentrically about the eccentric shaft portion 8a, and the inner peripheral tooth portion 4 moves while rotating the outer peripheral surface of the outer peripheral tooth portion 2, whereby the outer gear plate 5 and the holder plate 7 are integrally formed. As a result, reclining adjustment can be performed so that the arm 6 rotates forward and backward at a desired angle about the shaft 8.

When the inner peripheral tooth portion 4 rotates, the force of the disc spring 12 engaging with the shaft 8 urges the shaft 8 in the direction indicated by the arrow. When rotated, the disc spring 12 rotates via the protrusions 13a, 13a, and a sliding resistance is generated between the outer peripheral edge of the disc spring 12 and the outer gear plate 5, thereby generating a braking effect. Therefore, if a load is applied to the seat back Sb and the outer peripheral tooth portion 2 tries to rotate quickly, the brake is suppressed to prevent the idling phenomenon.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the following description, the bush 20 having a T-shaped cross section is fitted to the deformed cross section 11 of the shaft 8, and a disc spring 12 pressed by the bush 20 is provided in contact with the outer gear plate 5. . The disc spring 12 has the same configuration as in the above embodiment. The bush 20 is formed with protrusions 20a, 20a corresponding to the protrusions 13a, 13a in the above embodiment, and the protrusions 20a, 20a are formed.
a enters and engages with the radial grooves 12b, 12b of the disc spring 12. The bush 20 is fixed to the end of the shaft 8 by a push nut 14 so as not to come off.

The bush 20 is made of sintered metal and has a flange 2
0b and the main body 20 are integrally formed, and the main body 20c and the flange 20
20b, a hole 20d having an irregular cross section is formed at the center. In the hole 20d, the irregular cross section 11 of the shaft 8 is provided.
Are fitted. Further, the washer 1 in the above embodiment is used.
8. The C-ring 19 is eliminated, and also serves to regulate the axial movement of the shaft 8. The other configuration is the same as that of the above-described embodiment, and the duplicate description will be omitted.

Therefore, in this embodiment, when the inner peripheral tooth portion 4 rotates, the force of the disc spring 12 engaging with the shaft 8 urges the shaft 8 in the direction indicated by the arrow, so that the rotation with the shaft 8 is performed. When the bush 20 is rotated, the protrusions 20a,
The disc spring 12 is rotated via 20a, and a sliding resistance is generated between the outer peripheral edge of the disc spring 12 and the outer gear plate 5 to generate a braking effect. Therefore, the seat back S
If a load is applied to b and the outer peripheral tooth portion 2 does not turn prematurely, it is suppressed by the brake to prevent the idling phenomenon.

If the contact area between the disc spring 12 and the bush 20 is increased so as to generate a predetermined sliding resistance with the bush 20 rotating together with the shaft 8, the projections 20a, 20a are not necessarily formed in the bush. 20
It is not necessary to be integrally formed. In this case, the disc spring 12 has a star-shaped hole 12 formed in the center as shown in FIG.
a flat top 12 slidingly contacting the bush 20
Form c.

Further, by using the bush 20, the washer 18 and the C-ring 19 for regulating the axial movement of the shaft 8 can be reduced, so that the assemblability is improved and the cost can be reduced.

[0026]

According to the invention described above, the rapid rotation of the inner gear plate is suppressed by the braking effect due to the sliding resistance between the peripheral portion of the disc spring and the outer gear plate, and the center portion of the disc spring and the bush. As a result, when the seat back is under load, the inner gear plate does not rotate quickly by operating the taumel mechanism, and the seat back tilts sharply, causing an unexpected feeling for the occupant. And make the seating feeling good.

[Brief description of the drawings]

FIG. 1 is a front view of a seat reclining device according to the present invention.

FIG. 2 is a sectional side view taken along the line AA of FIG. 1;

FIG. 3 is a cross-sectional side view of an inner side seat reclining device similar to FIG. 2;

FIG. 4 is a partially enlarged view of FIG. 2;

FIG. 5 is a perspective view of a disc spring and a washer.

FIG. 6 is a sectional side view showing another embodiment of the present invention.

FIG. 7 is a perspective view of a disc spring and a bush.

FIG. 8 is a perspective view showing another example of a disc spring and a bush.

FIG. 9 is a sectional side view of a conventional example.

FIG. 10 is a sectional side view of a conventional example.

[Description of Signs] 1 ... Base plate 2 ... Outer teeth 3 ... Inner gear plate 4 ... Inner teeth 5 ... Outer gear plate 6 ... Arm 8 ... Shaft 8a ... Eccentric shaft 12 ... Disc spring 13 ... Washer 13a ... Projection Part 14: Push nut 20: Bush 20a: Protrusion

Claims (2)

(57) [Scope of request for utility model registration] An outer gear plate, an inner gear plate meshing with the outer gear plate with a predetermined number of teeth, and a center portion of the outer gear plate,
And, in a seat reclining device having a Taumel mechanism including a shaft having an eccentric shaft portion penetrating a center portion of an inner gear plate, a disc spring is fitted to an end portion of the shaft projecting from the outer gear plate. A seat reclining device characterized in that an outer peripheral edge is slidably contacted with an outer gear plate, and a washer or bush that engages with the inner peripheral edge of the disc spring and rotates together with the shaft is fitted. 2. An outer gear plate, an inner gear plate that meshes with the outer gear plate with a predetermined number of teeth difference, and a central portion of the outer gear plate,
And, in a seat reclining device having a Taumel mechanism including a shaft having an eccentric shaft portion penetrating a center portion of an inner gear plate, a disc spring is fitted to an end portion of the shaft projecting from the outer gear plate. A seat reclining device characterized in that an outer peripheral edge is slidably contacted with an outer gear plate, and a bush that is slidably contacted with a center portion of the disc spring and rotates together with a shaft is fitted.