JPH0313230Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reclining device for steplessly adjusting the angle of the seat back of a seat in a vehicle, etc., and particularly relates to an improvement of the invention of Utility Model Publication No. 54-408.

The above-mentioned Utility Model Publication No. 54-408 is related to an application by the present applicant, in which an upper arm fixed to a seat bag and a lower arm fixed to a cushion seat are pivotally connected and rotated about the pivot shaft. A first pinion is provided, and the lower arm rotatably supports a gear shaft having a large gear meshing with the first pinion and a second pinion coaxial with the large gear below the pivot shaft. The second pinion is formed with an arcuate toothed portion that engages with the second pinion.

In this device, when the first pinion is rotated via the operating handle, the large gear and second pinion that mesh with the first pinion rotate together, and the second pinion changes the meshing position with the arcuate toothed part. , the angle of the member supporting the second pinion, that is, the upper arm (seat back), can be changed steplessly.

The above-mentioned arc-shaped toothed part of this device is formed by drilling an arc-shaped hole in the lower arm and forming it on one side.
In conventional devices, an internal gear is formed on the surface of this arcuate hole on the side far from the first pinion shaft. For this reason, there was a problem in that the distance between the pivot shaft and the gear shaft became long, and the lower arm and upper arm became larger.

Based on this awareness of the problem, the present invention was made with the aim of further reducing the size and weight of the device proposed in Utility Model Publication No. 54-408.
The lower arm is characterized in that the arcuate toothed portion is formed on the convex arcuate surface of the arcuate hole formed in the lower arm around the first pinion, on the side closer to the first pinion. By changing the formation position of the arc-shaped toothed part in this way, the distance between the pivot shaft and the gear shaft can be reduced, and this type of device can therefore be made lighter and smaller. can.

The invention will now be described with reference to the illustrated embodiments. In FIGS. 1 to 3, 11 is an upper arm fixed to the lower side of the seat bag 12;
is a lower arm fixed to the rear side of the cushion seat 14, and both are pivotally connected by a pivot shaft 15. 16 is a first pinion formed integrally with this pivot shaft 15.

A gear shaft 19 having a second pinion 17 and a large gear 18 integrally coaxially is rotatably supported by the upper arm 11 at a position below the pivot shaft 15 . The large gear 18 meshes with the first pinion 16. A sub-plate 20 supports the gear shaft 19 from the opposite side of the upper arm 11 with the lower arm 13 in between, and its upper end is fixed to the upper arm 11 by a fixing rivet 21.

On the other hand, the second pinion 17
It meshes with the arcuate toothed part 22 formed at 3. This arcuate toothed portion 22 connects to the pivot shaft 15 (first pinion 16) of the arcuate hole 23 bored in the lower arm 13.
It is formed as an external gear on the surface close to . Here, the term "external gear" refers to a gear formed on a convex arc surface near the first pinion 16 side of the arc hole 23. Note that 24 is a sub-plate 20 of the pivot shaft 15.
This is an operating handle fixed to the protruding end of the

In this device having the above configuration, when the pivot shaft 15 is rotated via the operation handle 24, the first pinion 16 rotates together with the large gear 18 that meshes with the first pinion 16. second pinion 17 of
rotates. Then, the second pinion 17 meshes with the arcuate toothed portion 22 , and the second pinion 17 meshes with the arcuate toothed portion 22 .
is formed on the lower arm 13 fixed to the cushion seat 14, so the second pinion 17
The meshing position with respect to the arcuate toothed part 22 changes. In other words, the lower end of the Atsupah arm 11 is the pivot shaft 15.
As a result, the angle of the upper arm 11 (seat back 12) changes. This angle change can be made steplessly according to the rotation angle of the first pinion 16. The load applied to the upper arm 11 (seat back 12) is the second pinion 1.
7. Reduction due to the gear ratio of the large gear 18 and the first pinion 16, and the frictional force generated between the brake disc 25 of the pivot shaft 15 and the brake hole 26 of the lower arm 13 into which it is fitted. It is possible to maintain the adjusted angle without providing a separate brake mechanism.

Further, in the present invention, since the arcuate toothed portion 22 is formed on the surface of the arcuate hole 23 on the side closer to the pivot shaft 15, the distance between the pivot shaft 15 and the gear shaft 19 is set small. It is possible to move the Atsupa Arm 1
Through the miniaturization of 1, it is possible to contribute to the overall reduction in weight and size. This effect will be explained with reference to FIG. In the above Utility Model Publication No. 54-408, as shown in Figure A,
The internal gear 27 formed on the concave arc surface outside the arc hole 23 was used as an arc tooth profile. In this conventional structure, since the arcuate hole 23 requires a clearance c with the second pinion 17, the larger the clearance c, the more the distance between the pivot shaft 15 and the gear shaft 17.
The distance between the axes becomes large. On the other hand,
If an external gear is formed on the convex arcuate surface inside the arcuate hole 23 to form the arcuate toothed part 22 as in the present invention, the second pinion 17 and the arcuate hole 23 are connected to each other as shown in FIG. No matter how large the clearance c required between the pivot shaft 15 and the gear shaft 19, the distance between the pivot shaft 15 and the gear shaft 19 can be set small regardless of the size of the clearance c. Therefore, the distance from the pivot shaft 15 of the upper arm 11 to the gear shaft 19 can be reduced, and the overall weight and size can be reduced.

As described above, according to the present invention, the upper arm fixed to the seat bag and the lower arm fixed to the cushion seat are pivotally connected, the first pinion which is rotatably operated is supported on the pivot shaft, and the upper arm A large gear that meshes with the first pinion is supported below the pivot shaft, a second pinion is integrally provided coaxially with the large gear, and the lower arm is further provided with an arc-shaped toothed portion that meshes with the second pinion. In the reclining device thus formed, it is possible to reduce the distance between the axes of the first pinion and the second pinion, thereby contributing to the reduction in weight and size of this type of reclining device.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of essential parts showing an embodiment of the reclining device of the present invention, Fig. 2 is a side view of the same in an assembled state, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4. A and B are plan views of main parts showing the effects of the device of the present invention in comparison with a conventional device. 11... Upper arm, 12... Seat back, 13... Lower arm, 14... Cushion seat, 15... Pivot shaft, 16... First pinion,
17...Second pinion, 18...Big gear, 19...
... Gear shaft, 22 ... Arc-shaped toothed portion, 23 ... Arc-shaped hole, 24 ... Operation handle.

Claims (1)

[Scope of utility model registration request] An upper arm fixed to the seat back and a lower arm fixed to the cushion seat are pivotally connected, and a first pinion that is rotatably operated is provided on the pivot shaft, and the upper arm has a large gear that meshes with the first pinion. A reclining device rotatably supports a gear shaft having a second pinion coaxial with the large gear, and the lower arm is formed with an arcuate toothed portion in which the second pinion engages, is formed in the convex arcuate surface of the arcuate hole formed in the lower arm with the first pinion at its center, on the side closer to the first pinion.