JP3186447B2 - 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 in an automobile seat device, and more particularly to a base plate having a lock mechanism unit in which main parts for adjusting reclining such as upper teeth, lower teeth, and cams are compactly integrated and integrated. It relates to a fixed structure.

[0002]

2. Description of the Related Art A seat reclining device is a device for setting an inclination angle of a seat back in a seat device of an automobile to secure a comfortable posture or an optimum driving posture of a seated person.

A conventional seat reclining device is shown in FIG.
As shown in the figure, a seat back 4 is fixed to a base plate 2 fixed to a seat cushion 1 via a hinge shaft 3.
The arm 5 is rotatably supported on the arm 5 and an upper tooth 6 having a tooth 6a formed on a circumference of a predetermined radius centered on the hinge shaft 3 is connected to the arm 5, and the arm 6 is connected to the tooth 6a. A lower tooth 7 having an engaging and disengaging tooth portion 7 a is supported by the base plate 2.

[0004] A cam 8 for rotating the lower tooth 7 and an operation lever 9 for rotating the cam 8 are rotatably supported by the base plate 2. In order to hold both the hinge shaft 3, the lower tooth 7, the cam 8, and the shafts 7e, 9a of the operation lever 9, the holder plate 2a
Are arranged in parallel with the base plate 2. And
A spring 9b is mounted between the operation lever 9 and the base plate 2, and the cam 8 moves the lower tooth 7 to the upper tooth 6
Is always urged to press.

A pin 6b projecting toward the base plate 2 is protruded from the upper part 6 or the arm 5, and an arc-shaped long hole 2b into which the pin 6b is inserted is formed in the base plate 2 within a predetermined angular range around the hinge shaft 3. Opened,
Alternatively, a standing bend is provided to abut on the pin 6b within a predetermined angle range.

If the operation lever 9 is lifted upward and rotated, the cam 8 rotates and the contact portion 8a moves away from the normal contact portion 7b of the lower tooth 7 and moves into the cam groove 7c. While lowering the contact portion 7d, the lower tooth 7 separates from the upper part 6 and the meshing of the lower tooth 7 is released, so that the upper part 6 is rotatable about the hinge shaft 3.

Therefore, when the occupant releases the operation lever 9 at the stage when the seat back 4 is set at a desired angle, the operation lever 9 returns to the original state by the force of the spring 9b, and the cam 8 rotates in the opposite direction. The contact portion 8a is moved from the cam groove 7c to the normal contact portion 7a.
b, and the lower tooth 7 is pressed against the upper tooth 6 so that the teeth 6a and 7a of the two mesh with each other, whereby the seat back 4 is locked at a desired inclination angle.

[0008]

However, according to the conventional seat reclining device, since the forward and backward inclination angles of the arm 5 are often different for each vehicle type, the flange portion of the base plate 2 is not provided. The notch, the arc-shaped long hole 2b and the bent portion within a predetermined angle range centered on the hinge shaft 3 must be formed for each operating angle such as a vehicle type, so that the seat reclining device is used for each operating angle. It becomes extremely difficult. The sharing of seat reclining devices is a new requirement based on the recent trend of integration and sharing of vehicle parts in the automobile manufacturing industry.

Therefore, the applicant has continuously proposed to unitize the lock mechanism (upper tooth, lower tooth, and cam) of the seat reclining device in order to share the operation angle of the seat reclining device. However, in the case where the lock mechanism is unitized, in the proposals so far, an arm to which the seat back is fixed is not attached to the upper part, and therefore, there is also a spiral spring for urging the arm to rotate forward. do not do. Further, there is no operation lever for rotating the cam as a unit. This makes it difficult to guarantee performance, for example, adjust the lever position for locking the cam and the lower teeth and measure the arm return torque.

Therefore, there is no other method for guaranteeing the performance of the lock mechanism unit except for each product to which the lock mechanism is attached.

Accordingly, an object of the present invention is to provide a seat reclining device having a lock mechanism unit capable of guaranteeing performance.

[0012]

In order to achieve the above object, a seat reclining device according to the present invention has an upper tooth having an arcuate tooth and a lower tooth having a tooth meshing with the tooth of the upper tooth. When, and disengage with said Roatsusu have a mesh and lock mechanism unit, respectively a cam between the two holder plates formed by pivotally supported to release the said teeth, the b <br The lock mechanism unit projects from the holder plate and locks the inner end of the spiral spring to the center shaft where the upper part is loosely fitted, and locks the outer end of the spiral spring to the upper part to prevent While energizing rotation in the falling direction,
An elastic machine is installed between the cam and the holder plate to urge the cam in a direction in which the lower tooth is pressed against the upper part , and the two holder plates are attached to the base plate.
Connecting part with the base plate, the upper part is an arm
And the cam is connected to an operating lever.
Were constructed, characterized in that it comprises respectively.

[0013]

[Function] The upper part is urged to rotate forward by a spiral spring, and the cam is urged to rotate so that the lower tooth is pressed against the upper part by an elastic machine, and the cam is held by two holder plates. Since the structure is provided so as to be pivotally supported, the performance of the lock mechanism unit itself can be assured without an arm to which the seat back is connected, a base plate for fixing the seat cushion, and an operation lever for rotating the cam.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. 1 and 2 show a seat reclining device,
This seat reclining device is configured using a lock mechanism unit 10 shown in FIGS. The lock mechanism unit 10 has its holder plate 11 fixed to a base plate 13 via a connecting pin 12.
FIG. 3C shows a connection structure between the holder plate 11 and the base plate 13.

Therefore, the base plate 13 may have a shape different from that of the related art as long as a through hole through which the connecting pin 12 is inserted can be formed in the base plate 13. In this example, the base plate 13 has a shape in which the head is largely cut out, and the cut-out portion is supplemented by the holder plate 11.

The lock mechanism unit 10 will now be described with reference to FIGS. 4 and 5. A part tooth 15, a lower tooth 16 and a cam 1 are provided between two holder plates 11.
7 is rotatably supported by shafts 19, 20 and 21, respectively. Further, a spiral spring 22 is mounted on the shaft 19, and a pin 23 for locking the outer end of the spiral spring 22 is attached to the upper part 15. Protrudingly mounted, the upper part 15 and the axis 19
To rotate counterclockwise about
The lock mechanism unit 10 is configured by a coil spring 31 being elastically mounted between the holder 7 and the holder plate 11.

The shafts 19 and 20 are connected to both holder plates 1
1 (see FIGS. 2 and 3A), and the shaft 21
Are supported by embossing the holder plate 11 (see FIG. 3B). As shown in FIG. 2, the shaft 19 is a center shaft of the lock mechanism unit 10 that protrudes from one side of the holder plate 11 and has a split groove 19a that locks the inner end of the spiral spring 22.

The holder plate 11 is provided with a pin insertion hole 24 at a lower portion thereof for connecting the base plate 13 to a portion 25 where the two holder plates 11 are bent inwardly to be in contact with each other.
3 is substantially polygonal. Therefore, the base plate 13 has a shape that becomes substantially equal to the shape of the conventional base plate only after being joined to the holder plate 11.

The holder plate 11 has shafts 19, 2
0, 21 are connected by caulking them in the form of stepped pins (see FIG. 2), and as shown in FIGS. 1 and 3D, a stepped pin is provided on the lower side of the center shaft (shaft 19). At 32, the connection is reinforced. The pin 32 also serves to stop the upper part 15 from rotating.

The upper tooth 15 has teeth 15a formed on a circumference having a predetermined radius centered on the shaft 19, and three through holes 29 for connecting the arms 28 (FIG. 1). ing. The arm 28 having a through-hole corresponding to the through-hole 29 is overlapped and the pin 30 (FIG. 1) is inserted therethrough.
By caulking the pin 30, both can be connected. Therefore, the upper part 15 has a shape having a projection for forming the through hole 29 for three-point support. As described above, the upper part 15 is provided with the pin 23 in order to lock the outer end of the spiral spring 22.

The lower tooth 16 has a cam portion 16b formed on the other end side opposite to the shaft support end portion.
A tooth portion 16a is formed on the upper side of b. Cam part 16
A lever 16c is formed continuously from b to the shaft support end. The lever portion 16c can abut on the lever portion 17a of the cam 17.

The cam 17 is a cam portion 1 of the lower tooth 16.
6b is supported by the holder plate 11 so as to rotate integrally with the shaft 21 with a contact portion 17b with which the contact portion 17b contacts.
The end provided on the b side is a locking portion 1 of one end of the coil spring 23.
7c. A coil spring 31 is mounted as an elastic machine between the engaging portion 17c of the cam 17 and the cut-and-raised portion 11a formed on the holder plate 11, and urges the cam 17 to rotate counterclockwise about the shaft 21. ing. The coil spring 31 partially accommodates the two holder plates 11 so as to be bent outward and accommodated therein.

An operation lever 33 is integrally and rotatably fitted to the shaft 21 of the cam 17. For example, one side of the shaft 21 is formed in an irregular cross section such as an oval, and an oval hole is formed in the operation lever 33. As shown in FIG.
Is crushed and connected to the operation lever 33. Therefore, the operation lever 33, the shaft 21 and the cam 17 rotate integrally.

In FIG. 1, a base plate having a shape indicated by an imaginary line Z is employed, and the flange portion of the base plate is connected to an upper part 1 as shown in FIG.
By forming the cover portion 34 by widening the cover portion 34 to the fifth side, the teeth 15a can be hidden when the arm 28 is tilted last, so that the inconvenience of foreign matter being caught in the teeth 15a can be eliminated.

Next, the operation of the above embodiment will be described. In FIG. 1, when the operation lever 33 is rotated clockwise about the shaft 21, the cam 1 integrated with the operation lever 33 is rotated.
7 rotates clockwise around the shaft 21 while pulling the coil spring 31, and the contact portion 17b moves away from the cam portion 16b.

The cam contact portion 17d is connected to the lever 16
Press the lower tooth contact portion 16d of the lower tooth 1
6 rotates clockwise around the shaft 20. Therefore, the engagement between the teeth 16a and the teeth 15a starts to be released.

When the contact portion 17b of the cam 17 separates from the cam portion 16b, the meshing of the teeth 16a and 15a is completely disengaged, and the cam portion 16b moves to the side surface of the contact portion 17b. Therefore, the upper part 15 becomes rotatable about the shaft 19. Lower tooth 16 is cam 1
7 will not be in a completely free state.
6c comes into contact with the lever portion 17a, and the swing is restricted.

Therefore, the arm 28 tilts forward by the force of the spiral spring 22 urged to rotate, and conversely, tilts backward when the arm 28 is rotated clockwise through the seat back. Further, when the operation lever 33 is released by inclining the seat back to a desired angle, the operation lever 33 is released from the coil spring 3.
The original state is returned by the force of 1, and the cam 17 rotates in the opposite direction to the above. The contact portion 17b of the cam 17 rotates counterclockwise about the shaft 21 and abuts on the cam portion 16b, so that the lower tooth 16 is biased by the force of the coil spring 31 around the shaft 20. Rotating in the counterclockwise direction in the figure, the teeth 16 a mesh with the teeth 15 a of the upper tooth 15. Therefore, the inclination angle of the seat back set as desired by the seated person is maintained.

[0029]

According to the present invention described above, the upper part is urged to rotate in the forward falling direction by the spiral spring, and the cam is urged by the elastic machine so that the lower tooth is pressed against the upper part. In addition, since the cam is pivotally supported between the two holder plates, even if there is no arm for connecting the seat back, a base plate for fixing the seat cushion, and an operation lever for rotating the cam, it is possible to use the same. Completed as a seat reclining device by itself, performance can be guaranteed regardless of changes in the arm or base plate.

[Brief description of the drawings]

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

FIG. 2 is a sectional side view of FIG.

FIGS. 3A to 3D are cross-sectional views of respective parts in FIG. 1;

FIG. 4 is a front view of a lock mechanism unit.

FIG. 5 is a sectional side view of FIG. 4;

FIG. 6 is a front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Lock mechanism unit 12 ... Connection pin 13 ... Base plate 14 ... Holder plate 15 ... Upper tooth 16 ... Lower tooth 17 ... Cam 19 ... Shaft (center shaft) 20, 21 ... Shaft 22 ... Spiral spring 28 ... Arm 31 ... Coil spring ( 33) Operation lever

Claims (3)

(57) [Claims] An upper tooth having an arcuate tooth, a lower tooth having a tooth engaged with the tooth of the upper tooth, and a cam engaging and disengaging the lower tooth to engage and disengage the tooth. have a locking mechanism unit formed by each rotatably supported between preparative two holder plates, the lock mechanism unit, the spiral spring to the center shaft upper tooth is protruded from the holder plate is loosely fitted The inner end portion is locked, the outer end portion of the spiral spring is locked to the upper part to urge forward rotation, and the lower tooth is pressed between the cam and the holder plate in a direction in which the lower tooth is pressed against the upper part. An armature for biasing the cam is attached , and the two
The base plate is connected to the base plate,
The parts are connected to the arm and the cam is operated.
A seat reclining device having a connection portion with a lever . 2. One end of a cam shaft is protruded from a holder plate to form the shaft into an irregular cross section, and a hole having an irregular cross section for fitting the shaft having the irregular cross section is formed in the operation lever. The seat reclining device according to claim 1, wherein the operation lever is connected to the cam shaft at the portion. 3. The cover according to claim 1, wherein the flange portion of the base plate in the vicinity of the upper tooth and the lower tooth is formed to have a width larger than the thickness of the upper tooth and the lower tooth to form a cover portion of the tooth portion. Seat reclining device.