JPH08196370A - Seat reclining device - Google Patents

Abstract

PURPOSE: To allow a tooth member to be easily machined without forming an unnecessary tooth section thereon by forming the lock tooth section of the member so as to simply correspond to recess depth having an internal tooth section. CONSTITUTION: A cam member 13 and a tooth member 14 are housed in an embossed recess 15 on a base plate 11, and another embossed recess 16 on a tooth plate 3. The section 16 is made to have an approximate segment form of the prescribed radius about a center shaft 2. Also, inner teeth 17 are formed on the internal surface of the circular arc section of the recess 16 at the preset pitch within the prescribed range. Furthermore, a lock teeth section 18 gearing with the sections 17 is formed to have such length as only corresponding to the depth of the recess 16 with the sections 17. According to this construction, the tooth member 14 can be easily machined without forming an unnecessary tooth section thereon, and the cost thereof can be reduced.

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 for an automobile or the like.

[0002]

2. Description of the Related Art A seat reclining device is a seat device capable of setting an inclination angle of a seat back within a predetermined range for the purpose of ensuring a safe driving posture of a driver and comfortable seating.

At the same time as the present application, the applicant filed a patent application to provide a new seat reclining device. In this seat reclining device, a center shaft is projectingly provided on a base plate, a tooth plate is rotatably fitted to the center shaft, and an arc portion having a predetermined radius centered on the center shaft is formed on the tooth plate on the base plate side. And a guide member in which a tooth member having an inner peripheral tooth portion formed in an arc portion of the concave portion and having a lock tooth portion meshing with the inner peripheral tooth portion is formed on the concave portion and the base plate facing the tooth member. And a cam member for slidingly moving the tooth member is rotatably housed in the recess and the guide portion by an operation lever.

[0004]

However, according to the above seat reclining device, the tooth member is sandwiched between the base plate and the tooth plate, and the tooth portion of the tooth member that meshes with the inner peripheral tooth portion of the tooth plate has the inner peripheral portion. Needless to say, it meshes with the teeth, but since it has a portion that is located on the concave side of the base plate and does not mesh with the inner peripheral teeth at all, it increases the wall thickness of the tooth member and forms unused teeth. Therefore, the cost of the tooth member is high.

In view of the above circumstances, the present invention provides a seat reclining device in which a tooth member having a tooth portion that meshes with the inner peripheral tooth portion of the tooth plate is improved.

[0006]

In a seat reclining device according to the present invention, a tooth plate is rotatably fitted to a center shaft of a base plate, and the tooth plate has a predetermined radius centered on the center shaft on the base plate side. A recess having an arcuate portion is formed, an inner peripheral tooth portion is formed in the arcuate portion of the recessed portion, and a tooth member having a lock tooth portion that meshes with the inner peripheral tooth portion is provided on the base plate facing the recessed portion. A seat reclining device in which a cam member that slidably accommodates in a formed guide portion and that slides the tooth member is accommodated in the concave portion and the guide portion by an operation lever is provided. The portion is formed only at the depth of the concave portion in which the inner peripheral tooth portion is formed.

[0007]

When the cam member is rotated via the operating lever, the tooth member slides upward and the engagement between the lock tooth portion and the inner peripheral tooth portion is released. Therefore, the tooth plate is centered on the center shaft with respect to the base plate. It becomes possible to turn to. When the operating lever is released after the reclining adjustment, the cam member rotates in the opposite direction, the tooth member slides downward, and the lock tooth portion meshes with the inner peripheral tooth portion to lock.

Since the lock tooth portion is formed only at the portion facing the inner peripheral tooth portion, in other words, only half the wall thickness of the tooth member, the extra tooth portion inscribed in the recess of the base plate is eliminated. The cost of the tooth member is reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a tooth plate 3 is rotatably supported by a center shaft 2 fixed to a base plate 1 by a caulking portion 2b. The tooth plate 3 has an arc portion 3a with a predetermined radius centered on the center shaft 2, and at least two flat-headed pins 4 having a shaft portion with which the peripheral edge portion of the arc portion 3a is in sliding contact are separated from each other on the base plate 1. It has been planted.

The center shaft 2 is stepped or has a collar 2a, and the tooth plate 3 has an embossed convex portion 3b which abuts against the collar 2a, and a hole 3c through which the center shaft 2 is inserted at the center of the embossed convex portion 3b. Has been drilled.
The operation lever 5 is rotatably fitted to the outer peripheral portion of the embossed convex portion 3b while being restrained by the collar 2a, and the embossed convex portion 1a of the base plate 1 is fitted to the inner peripheral portion of the embossed convex portion 3b. Oval-shaped hole 1b with a different diameter in the center of the embossed protrusion 1a
Is formed, and the different diameter section 2c of the center shaft 2 is fitted into the different diameter hole 1b. The back surface of the embossed convex portion 1a is caulked and fixed by a caulking portion 2b.

A long hole 6 is formed in the operating lever 5 in the plane of the tooth plate 3 so as to be inclined. A return spring 7 is mounted between the operating lever 5 and the flat head pin 4. An inner end of the spiral spring 8 is hooked on the center shaft 2, and an outer end of the spiral spring 8 is hooked on a spring hook 3d formed on the tooth plate 3. The spring retaining portion 3d is formed between the connecting portions 10a having the bolt insertion holes 10 for connecting the seat back frame 9.

The center plate 2 is provided on the tooth plate 3.
An elongated hole 11 is formed on a circumference of a predetermined radius centered on the center, and is rotated and vertically slid through the elongated hole 11 and an operation pin 12 that engages with the elongated hole 6 of the operation lever 5. A cam member 13 is sandwiched between the base plate 1 and the tooth plate 3 as much as possible. The tooth member 14 is disengaged from the cam member 13 and slidable in the vertical direction.
And is sandwiched between the tooth plates 3. Cam member 13
The tooth member 14 is located in a triangular plane surrounded by the pair of spaced flat head pins 4 and 4 and the center shaft 2.

The cam member 13 and the tooth member 14 form a lock mechanism together with the operating lever 5. As shown in FIG. 3, the cam member 13 and the tooth member 14 are an embossed recess 15 and a tooth formed on the base plate 1. Plate 3
It is housed in the embossed concave portion 16 formed in.

The embossed concave portion 15 has a side portion 15a in a substantially quadrangular portion, and the tooth member 14 slides on the side portion 15a and acts as a guide portion for movably fitting in the radial direction of the center shaft 2. . Furthermore, the embossed recess 1
5 has an arc portion 15b in a substantially circular portion, and the substantially circular shaft portion 21 of the cam member 13 is rotatably fitted in the arc portion 15b.

The embossed recess 16 is substantially fan-shaped with a predetermined radius centered on the center shaft 2, and inner peripheral teeth 17 are formed on the inner peripheral surface of the arc portion at a predetermined pitch within a predetermined range. . A lock tooth portion 18 that meshes with the inner peripheral tooth portion 17 is formed on the lower end edge of the tooth member 14.

As shown in FIG. 4A, the lock tooth portion 18 corresponds to the inner peripheral tooth portion 17 in a plate body 40 having a thickness that is slightly smaller than the distance between the embossed recesses 15 and 16. The lock tooth portion 18 is formed only on the portion, in other words, about half the thickness of the plate body 40, and as shown in FIG. 4B, the plate body 41 having a thickness corresponding to the depth of the embossed recess 15 is formed. An embossed protrusion 42 is formed on the base plate, and a lock tooth portion 18 is formed on the embossed protrusion 42. As shown in FIG. 4C, a thick plate 43 corresponding to the depth of the embossed recess 15 is formed.
A protrusion 44 is formed integrally with the protrusion 44, and a lock tooth is formed on the protrusion 44, or as shown in FIG. The plate members 45 and 46 may be integrally coupled with the pin protrusions 47 and 48 and the insertion holes 49 and 50, and the lock tooth portion 18 may be formed on only one plate member 45.

A hook portion 19 is integrally formed on the upper portion of the tooth member 14, and the lever portion 20 of the cam member 13 is engaged with and disengaged from the hook portion 19. That is, the cam member 13 has a lever portion 20 having a shape capable of entering the hook portion 19, and a substantially circular shaft portion 2 that fits into the arc portion 15b of the embossed recess 15.
1 and the shaft portion 22 projecting the operation pin 12 are integrally formed. The shaft portion 22 is loosely fitted in a circular arc portion 15c formed in a lower position adjacent to the circular arc portion 15b of the embossed concave portion 15.

The operation pin 12 is extended to both sides of the cam member 13 by a predetermined length, and the extended operation pin 12 is formed with a long hole 23 in the base plate 1 so as to project to the back side of the base plate 1. The long hole 23 has a center shaft 2 and an operation pin 1.
It is formed with a predetermined length on the same line as the line connecting the two.

In order to caulkly connect the operation pin 12 as a flanged pin to the cam member 13, as shown in FIG. 5, the portion of the cam member 13 through which the operation pin 12 is inserted is made thin so that the stepped portion 13a is formed. The flange 12a and the caulking portion 12b are accommodated in the stepped portion 13a, and the collar 12 is formed on both sides of the cam member 13.
By preventing a and the caulked portion 12b from projecting from both side surfaces of the cam member 13, the diameters of the long holes 11 and 23 can be reduced, and the strength reduction due to the drilling of these holes can be prevented.

In assembling the above structure, the operation lever 5, the tooth plate 3, and finally the cam member 13 and the tooth member 14 are housed in the embossed recess 15 of the center shaft 2, and the base plate 1 is inserted. After fitting each, the head portion 2a of the center shaft 2 is caulked and coupled to the base plate 1.

Then, a shaft portion 2d having a circular cross section is formed on the side of the center shaft 2 which is caulked, and a connecting pipe 24 is rotatably fitted to the shaft portion 2d.
A link lever 25 is integrally connected to one end of the connecting pipe 24. At the end of the link lever 25, the operation pin 1
A hole 26 for fitting 2 is formed. Connecting pipe 24
Extends to the other seat reclining device arranged on the inner side of the seat device and interlocks it.

Next, the operation of the above embodiment will be described. When the reclining adjustment is performed, that is, when the tooth plate 3 is tilted, the operation lever 5 is rotated clockwise about the center shaft 2 as shown in FIG.
As shown in FIG.
Is pushed obliquely upward, whereby the cam member 13 rotates clockwise about the shaft portion 21 and the lever portion 20
Enters the hook portion 19 and pushes the tooth member 14 upward along the side portion 15a of the embossed recessed portion 15, so that the engagement between the lock tooth portion 18 and the inner peripheral tooth portion 17 is released. Therefore, the tooth plate 3 is rotated counterclockwise about the center shaft 2 by the urging force of the spiral spring 8.

Therefore, when the seat back frame 9 is set to a desired inclination angle and the operating lever 5 is released, the operating lever 5 returns to its original state by the force of the return spring 7, and FIG.
As shown in FIG. 3, the operation pin 12 is pushed down through the elongated hole 6, the cam member 13 rotates counterclockwise about the shaft portion 21, and the lever portion 20 moves the tooth member 14 through the hook portion 19. Therefore, the lock tooth portion 18 and the inner peripheral tooth portion 17 mesh with each other to lock the reclining angle. When the lock tooth portion 18 and the inner peripheral tooth portion 17 mesh with each other, a tooth is formed on a line connecting a portion where the lever portion 20 of the cam member 13 abuts the tooth member 14 and a portion where the shaft portion 21 abuts the arc portion 15b. A drag force that opposes the force that tries to release the meshing of the member 14 (the force that pushes up the tooth member 14) is formed.

Thus, the force applied to the tooth member 14 is applied to the embossed recess 1 of the base plate 1 via the cam member 13.
5b, and the operation lever 5 via the operation pin 12
Since the structure is such that no load is directly applied to the control lever 5, the operation of the operation lever 5 becomes light. Further, the tooth plate 3 is pressed by the flat-headed pin 4 planted in the base plate 1, while the cam member 13 is pressed.
Since the tooth member 14 is located in the triangular plane surrounded by the pair of spaced apart flat head pins 4 and 4 and the center shaft 2, the base plate 1 and the tooth plate 4 are arranged.
It is safe because there is no peeling motion between the tooth member 14 and the cam member 13 which are sandwiched between them.

In this embodiment, the tooth member 1
4 and the cam member 13 are accommodated in the embossed concave portion 15 formed in the base plate 1, but an embossed convex portion is formed in the base plate 1 and the embossed convex portion serves as a guide portion.
The tooth member 14 may be slidably accommodated and the shaft portion 21 may be rotatably supported.

[0026]

According to the present invention described above, since the lock tooth portion of the tooth member is formed only in the depth of the concave portion in which the inner peripheral tooth portion is formed, an unnecessary tooth portion is formed in the tooth member. Therefore, the machining of the tooth member is facilitated, and therefore the cost of the tooth member can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a seat reclining device showing an embodiment of the present invention.

FIG. 2 is a sectional side view of FIG.

FIG. 3 is a plan view of an essential part of FIG.

4A to 4D are detailed views of a configuration example of a tooth member.

FIG. 5 is a side view of the cam member.

6 (A) and 6 (B) are explanatory views of the operation of the lock mechanism section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base plate 2 ... Center shaft 3 ... Tooth plate 4 ... Flat head pin 5 ... Operating lever 6 ... Long hole 7 ... Return spring 8 ... Spiral spring 11,23 ... Long hole 12 ... Operation pin 13 ... Cam member 14 ... Tooth member 15 , 16 ... Embossed recessed portion 17 ... Inner peripheral tooth portion 18 ... Lock tooth portion 19 ... Hook portion 20 ... Lever portion 21 ... Shaft portion 40, 41, 43, 45 ... Plate 42 ... Embossed protrusion 44 ... Projection portion 47, 48 ... Pin projection 49, 50 ... Insertion hole

Claims (5)

[Claims] 1. A tooth plate is rotatably fitted to a center shaft of a base plate, and a concave portion having an arc portion having a predetermined radius centered on the center shaft is formed on the tooth plate side of the tooth plate. An inner peripheral tooth portion is formed in the arc portion, and a tooth member having a lock tooth portion that meshes with the inner peripheral tooth portion is slidably accommodated in a guide portion formed on the base plate facing the concave portion,
In a seat reclining device in which a cam member for slidingly moving the tooth member is rotatably housed in the concave portion and a guide portion by an operating lever, a lock tooth portion of the tooth member is a concave portion formed with the inner peripheral tooth portion. The seat reclining device is characterized in that it is formed only at the depth of. 2. The tooth member comprises a plate body having a wall thickness corresponding to the depth of the guide portion of the base plate and a lock tooth portion having a height corresponding to the depth of the recess of the tooth plate. The seat reclining device according to claim 1, which is characterized in that. 3. The tooth member has an embossed protrusion having a height corresponding to the depth of the recess of the tooth plate formed on a plate body having a thickness corresponding to the depth of the guide portion of the base plate. The seat reclining device according to claim 1, wherein a lock tooth portion that meshes with the inner peripheral tooth portion is formed in the portion. 4. The tooth member is formed by integrally forming a protrusion having a height corresponding to the depth of the recess of the tooth plate on a plate body having a thickness corresponding to the depth of the guide portion of the base plate. The seat reclining device according to claim 1, wherein a lock tooth portion that meshes with the inner peripheral tooth portion is formed in the seat. 5. The tooth member has a first plate body having a wall thickness corresponding to the depth of the guide portion of the base plate, a height corresponding to the depth of the recess of the tooth plate, and the inner peripheral tooth. 2. The seat reclining device according to claim 1, wherein the seat reclining device is integrally formed with a second plate body having a lock tooth portion that meshes with the portion.