JP2577493Y2 - Reclining mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining mechanism capable of adjusting a front-back inclination angle of a seatback constituting a seat.

[0002]

2. Description of the Related Art As one type of the reclining mechanism, a publication "Automotive Engineering Handbook, Vol. 6, pages 1-26 (Showa 5)
(Published by the Society of Automotive Engineers of Japan on September 30, 2008)), and a seat back rotatably mounted on the rear end of the seat cushion constituting the seat. A ratchet disposed between the lower end and the seat back and having a fan-shaped tooth portion fixed to the seatback side; and a tooth portion capable of meshing with the tooth portion of the ratchet and swinging toward the seat cushion. There is a reclining mechanism including a pole that is movably assembled and meshes with the teeth of the ratchet so as to be able to be separated therefrom.

In the reclining mechanism, the teeth of the pawl mesh with an arbitrary part of the teeth of the ratchet to lock the seatback to the seat cushion, and the teeth of the pawl relative to the teeth of the ratchet. By releasing the meshing of the seat cushion, the seat back is allowed to rotate in the front-rear direction with respect to the seat cushion, and the inclination angle can be adjusted. Therefore, it is necessary to ensure that the teeth of the pawl mesh and disengage with any part of the teeth of the ratchet, and thus the teeth of the pawl have arc-shaped teeth corresponding to the teeth of the ratchet. Part is formed.

[0004]

For this reason, the ratchet and the pole need to be manufactured with high dimensional accuracy. Even if both of them are manufactured with high dimensional accuracy, the mounting accuracy of the ratchet on the seatback side is required. If the accuracy of assembling the pole to the seat cushion is not good, the teeth of the pole do not mesh properly with the teeth of the ratchet, and in some cases, the direction in which the teeth of the pole are formed. Occurs only at the tip end of the ratchet meshes with part of the ratchet teeth, and in some cases, only at the rear end of the pole teeth in the tooth formation direction meshes with part of the ratchet teeth. I do.

In these cases, the teeth of the pawl mesh with the teeth of the ratchet in a biased manner, which adversely affects the durability of the teeth of the pawl. FIGS. 4 and 5 (a) and (b) show three modes of the engagement state of the pawl with the ratchet. FIG. 4 shows a case where the assembling accuracy of the ratchet 1 and the pawl 2 is high (ratchet 1). 5 (a) shows the meshing state when the distance L0 between the rotation fulcrum and the swinging fulcrum of the pole 2 is the correct dimension), and FIG. 5 (a) shows the meshing state when the distance L1 (<L0). b) shows the meshing state when the distance is L2 (> L0). Of these, it is clear that the meshing of the pawl 2 with the ratchet 1 is biased in the meshing state of FIGS. 5 (a) and 5 (b). Therefore, an object of the present invention is to address such a problem.

[0006]

According to the present invention, there is provided a reclining mechanism of the type described above, wherein the pole is connected to the sheath.
A pole body having a base end swingably mounted on the cushion side; and a fitting recess provided at a swing end of the pole body, having a tooth portion meshable with the teeth of the ratchet. And a toothed body facing the toothed part of the ratchet, and a projection having an arc-shaped cross section is provided at the bottom of the fitting recess of the pole body, and the toothed part is formed at the projection. An intermediate portion of the bottom portion of the body in the tooth forming direction is received, and the tooth portion is assembled so as to be swingable with respect to the teeth of the ratchet around the receiving portion. is there.

[0007]

In the reclining mechanism constructed as described above, since the both ends of the teeth constituting the pole swing with respect to the teeth of the ratchet, the dimensional accuracy of mounting the ratchet on the seatback side. And / or even if the dimensional accuracy of the pole on the seat cushion side is low,
Due to the swinging of the teeth of the pawl, the teeth of the teeth are accurately meshed with any part of the teeth of the ratchet, and the meshing state is not biased. For this reason, it is possible to prevent the durability of the teeth of the pole from being reduced due to the unbalanced engagement state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a reclining mechanism according to the present invention. The reclining mechanism 10 includes a ratchet 11, a pawl 12, a release lever 13, a cam 14, and a tension spring 15, and is fixed to a lower arm 21 fixed to a seat cushion and a seat back. It is arranged between the upper arms 22.

The lower end of the upper arm 22 is attached to the rear end of the lower arm 21 so as to be pivotable in the front-rear direction, and is urged forward by a helper spring (not shown). A side plate 23 is fixed to the lower arm 21. The ratchet 11 has a fan shape as shown in FIGS. 1 and 2, and is fixed to the upper arm 22 so as to be integrally rotatable therewith. The ratchet 11 has an arcuate tooth portion 11a at the tip edge.
The tooth portion 11a has an arc shape centered on the pivot point of the upper arm 22.

The pole 12 includes a pole body 12a and a toothed body 12c fitted and fitted into a fitting recess 12b provided at the swinging end of the pole body 12a. The tooth body 12 is mounted so as to be swingable.
The tooth part 12d of c faces the tooth part 11a of the ratchet 11. The release lever 13 is integral with the cam 14 and is attached to the lower arm 21 at a fixed portion of the cam 14 so as to be rotatable in the vertical direction. The pawl 12, the release lever 13 and the cam 14 are held between the lower arm 21 and the side plate 23, and a tension spring 15 is engaged between the release lever 13 and the side plate 23.

In this state, the release lever 13 is urged in the counterclockwise direction in the drawing, and the cam 14 is brought into contact with the back of the pawl 12 to press the pawl 12 and the tooth portion 1 of the pawl 12 is pressed.
2d is meshed with a part of the teeth 11a of the ratchet 11. An arc-shaped cam groove 1 is provided at the tip of the release lever 13.
3a, a cam pin 12e is implanted in the pawl 12, and the cam pin 12e is
3a.

In the reclining mechanism 10,
When the release lever 13 is not operated, the teeth 12d of the pawl 12 mesh with a part of the teeth 11a of the ratchet 11, as shown in FIG. 1, and the upper arm 22 is locked to the lower arm 21. Therefore, the seat back (not shown) is locked with respect to the seat cushion. When the release lever 13 is rotated clockwise in the figure against the tension spring 15 in this state, the cam 14 is integrally rotated in the same direction to separate from the back of the pawl 12, and the cam groove 13a and the cam pin 13 The pole 12 is separated from the ratchet 11 by the action of 12e. As a result, the engagement of the pawl 12 with the ratchet 11 is released, the lock of the upper arm 22 with the lower arm 21 is released, and the seatback can rotate in the front-rear direction. Can be.

As shown in FIGS. 2 and 3, the fitting recess 12b provided in the pole body 12a constituting the pole 12 is slightly larger than the tooth body 12c and has a similar shape. An arc-shaped projection 12f extending in the width direction is formed at the center of the bottom. Tooth body 12c
Is inserted into the fitting recess 12b from the side opening side and fitted,
A protrusion 12f is formed at the center of the bottom in the direction of forming the teeth.
The tooth portion 12d of the tooth body 12c faces the tooth portion 11a of the ratchet 11, and the pole body 12a
The meshing and disengaging of the same tooth portion 11a are performed by the swing of the gear. The tooth body 12c is capable of swinging with respect to the tooth 11a of the ratchet 11 at the front end and the rear end side about the projection 12f of the fitting recess 12b.

The reclining mechanism 10 having the above-described structure functions and has the same effect as the conventional reclining mechanism of this type as described above.
2 has a special configuration, so that the following operational effects can be obtained. That is, the teeth 12c constituting the poles 12 of the reclining mechanism 10 swing around the center thereof with respect to the teeth 11a of the ratchet 11 and advance and retreat, so that the ratchet 11 is assembled to the upper arm 22. Mounting dimension accuracy and / or pole 1
Even if the dimensional accuracy of the assembly 2 to the lower arm 21 is low, it is corrected by the swing of the tooth body 12c of the pole 12, and the tooth 12d of the tooth body 12c of the pole 12 is caused by the swing of the tooth body 12c. By correction, the ratchet 11 as shown in FIG.
Meshing with an arbitrary portion of the tooth portion 11a, and the meshing state is not biased. For this reason, it is possible to prevent a decrease in the durability of the teeth 12d of the pawl 12 due to the unbalanced engagement state.

[Brief description of the drawings]

FIG. 1 is a side view of a reclining mechanism according to the present invention.

FIG. 2 is a ratchet constituting the reclining mechanism;
It is a side view which shows the relationship between a pawl and a cam.

FIG. 3 is a perspective view of a pole constituting the reclining mechanism.

FIG. 4 is a side view of a conventional reclining mechanism.

FIG. 5 is a side view showing different states of engagement of the pawl with the ratchet in the reclining mechanism.

[Explanation of symbols]

10 Reclining mechanism, 11 Ratchet, 11a
... Arc-shaped teeth, 12 ... pole, 12a ... pole body, 1
2b: fitting concave portion, 12c: tooth body, 12d: tooth portion, 12
f: Projection, 13: Release lever, 14: Cam, 15 ...
Tension springs, 21: Lower arm (sheet cushion side member), 22: Upper arm (sheet back side member).

Claims (1)

(57) [Scope of request for utility model registration] 1. A seat back which is disposed between a rear end of a seat cushion constituting a seat and a lower end of a seat back rotatably mounted on the rear end of the seat cushion. A ratchet having a fan-shaped tooth portion fixed to the ratchet, and a tooth portion capable of meshing with the tooth portion of the ratchet, being swingably mounted on the sheet cushion side and being releasable from the tooth portion of the ratchet. A reclining mechanism provided with a pawl that meshes with the pawl main body, the pawl body of which is rotatably mounted at the base end thereof on the seat cushion side, and a tooth part that can be engaged with the tooth part of the ratchet. A toothed body that is fitted and assembled into a fitting recess provided at the swinging end of the pole body and faces the teeth of the ratchet, and has a bottom portion of the fitting recess of the pole body. An arc-shaped projection is provided and the tooth portion is formed at the projection. Reclining mechanism of to receive a middle portion of the teeth forming direction at the bottom, characterized in that the same teeth body assembled swingably against teeth of the ratchet around the nest.