JPH07997Y2 - Seat reclining mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a reclining mechanism for a seat.

(Prior Art) JP-A-51-1 as one type of reclining mechanism for seats
As disclosed in Japanese Patent No. 04722, a first ring gear integrally rotatably provided on a hinge plate fixed to a seat cushion side of a seat and a hinge plate fixed to a seat back side are integrally rotated. A second ring gear that is possibly provided and that has a number of teeth different from the number of teeth of the first ring gear and that is positioned in parallel with the ring gear; and an operating shaft that rotatably passes through the central portions of these ring gears. A sun gear that is integrally rotatably disposed on the upper side of the ring gear, and a planetary gear that is located between the sun gear and the both ring gears and that meshes with these three gears. There is a seat reclining mechanism of the type provided with a support plate that rotatably supports the planetary gears. Oite rotates the planetary gear by rotating the integral sun gear and which by rotating the operating shaft, which adjusts the inclination angle of the longitudinal direction of the seat back.

(Problems to be solved by the invention) By the way, in such a type of reclining mechanism, since the load applied from the seat back to the hinge plate acts on the operation shaft, the rotation operation of the operation shaft is heavy and the coaxial force is considerably high. Strength is required. Further, in the reclining mechanism of this type, the hinge plate and the ring gear on the seat back side are separately formed, and a coupling means for releasably locking both of them is provided.
The seat back can be tilted back and forth all at once by unlocking both of them, but the seat back is tilted forward, neutral, and tilted, and it is changed to a predetermined multiple positions such as full flat at once. You cannot do it.

Therefore, a first object of the present invention is to configure a reclining mechanism of this type so that the load applied from the seat back to the hinge plate does not act on the operation shaft, and the second object is to provide the seat back with a predetermined size. It is configured to be able to change to a plurality of positions at once.

(Means for Solving the Problems) The present invention is a reclining mechanism of the type described above, and a first invention thereof is a reclining mechanism in which the operating shaft is fitted in through holes of the ring gears and supported by a hinge plate. According to a second aspect of the invention, one of the ring gears is formed separately from the hinge plate, and the ring gear has a plurality of teeth on the outer periphery of the ring gear. The hinge plate is provided with a pawl that releasably meshes with the ratchet, and a release means for releasing the meshing of the pawl with the ratchet is provided.

(Operation and Effect of the Invention) In the above-mentioned first invention, the load applied from the seat back to the hinge plate is received by the hinge plate supporting the collar via the collar, and the load is applied to the operation shaft penetrating the collar. Does not work. Therefore, the rotating operation of the operating shaft is not affected by the load and is light, and the operating shaft itself is not required to have high strength, and the operating shaft can be made thin and lightweight. .

Further, in the above-mentioned second invention, the meshing position of the pole with respect to the ratchet can be changed to a plurality of positions by operating the releasing means, whereby the seat back is changed at once to the inclination angle corresponding to each position. be able to.

(Embodiment) The present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a reclining mechanism according to an embodiment of the present invention. The reclining mechanism A is provided between the seat cushion B and the seat back C as shown in FIG. 4, and adjusts the inclination angle of the seat back C steplessly or in steps. The reclining mechanism A includes a first hinge plate 11, a second hinge plate 12, an operating plate 13, an operating shaft 14, a sun gear 15, and three planetary gears 16a to 16c, 2
Support plates 17a, 17b, pole 18, release lever
19, the tension spring 20 is the main component.

The first hinge plate 11 is composed of a lower arm 11a and a sub plate 1b which are assembled to the seat cushion B side, and these both 11a and 11b are attached by caulking pins 11c to 11e at three positions in a state where the above-mentioned respective constituent members are assembled. Are connected to each other. Collars 21a and 21b are fitted in openings 11f and 11g provided in the lower arm 11a and the sub-plate 11b, which are opposed to each other, and both collars 21a and 21b are in series on the same axis. The operation shaft 14 rotatably passes through the inside of the shafts 21b. The operation shaft 14 is locked at one end, and a handle 14a is integrally rotatably fitted to the other end.

The second hinge plate 12 is composed of an upper arm that is assembled to the seat back C side, and the lower portion of the plate 12 is formed in a stepped circular recess 12a and the inside diameter of the opening of the recess 12a is large. A second ring gear 12b is formed around the circumference.
The ring gear 12b has, for example, 26 teeth. The second hinge plate 12 is rotatably mounted on the collar 21a with the support plate 17a fitted in the recess 12a. The operating plate 13 is provided with a circular recess 13a facing the recess 12a of the second hinge plate 12, and a first ring gear 13b is formed on the inner circumference of the large diameter on the opening side. The ring gear 13b has, for example, 23 teeth. Further, the outer periphery of the lower end of the operating plate 13 is formed into an arcuate ratchet 13c composed of three teeth, and the plate 13 has a collar 21b with a support plate 17b fitted in the recess 13a. It is rotatably mounted on the
It is joined to the second hinge plate 12 by a holding plate 13d.

The sun gear 15 is formed with seven teeth, is integrally rotatably mounted on the operating shaft 14, and is located between the collars 21a and 21b. Each planetary gear 16a to 16c has eight teeth, is rotatably supported by both support plates 17a and 17b, and meshes with both ring gears 12b and 13b and the sun gear 15.

On the other hand, the pole 18 is rotatably assembled by the caulking pin 11c while being held between the lower arm 11a and the sub-plate 11b that form the first hinge plate 11, and the operating plate 1
Opposite the 3rd ratchet 13c. The pawl 18 has a tooth portion 18a that meshes with each tooth portion of the ratchet 13c, and also has a cam pin 18b. Release lever 19 is 3
One arm portion 19a, 19b, 19c is provided, a cam hole 19d is formed in the first arm portion 19a, and the second arm portion 19b is an operation portion. The release lever 19 is attached to the lower arm 11a and the sub-plate 11b by the caulking pin 11d while being held integrally with the cam 22, and the release lever 19 and the cam 22 are integrated with the lower arm 11a and the sub-plate 11b. Turn to. The cam pin 18d faces the cam hole 19d of the release lever 19. Third of such release lever 19
A tension spring is installed between the arm 19c and the lower arm 11a.
20 is locked and the spring 20 is a release lever.
19 is urged counterclockwise in FIG. As a result, the cam 22 integral with the release lever 19 abuts on the back portion of the pole 18 and meshes the pole 18 with one of the tooth portions of the ratchet 13c.

In the reclining mechanism A having such a configuration, the non-operated pole 18 of the release lever 19 meshes with one of the teeth of the ratchet 13c, and the operating plate 13 is integrally connected to the first hinge plate 11. . Therefore, the first ring gear 13b can rotate integrally with the first hinge plate 11, and the second ring gear 12b can rotate integrally with the second hinge plate 12.

When the handle 14a is rotationally operated in such a state, the operation shaft 14 and the sun gear 15 are integrally rotated to rotate the planetary gears 16a to 16c. As a result, the planetary gears 16a to 16c try to rotate both ring gears 12b and 13b, but due to the difference in the number of teeth of both ring gears 12b and 13b, relative rotation occurs between these two gears 12b and 13b, and the second hinge The plate 12 rotates in the front-rear direction, and the inclination angle of the seat back C is adjusted steplessly according to the rotation operation amount of the handle 14a. The second hinge plate 12 from the seat back C
Each gear locks against the load that rotates the seat back C and holds the state of the seat back C.

On the other hand, when the release lever 19 is rotated in the clockwise direction shown in FIG. 2 against the tension spring 20, the release lever 19 and the cam 22 are integrally rotated in the same direction about the crimp pin 11d, and the cam is rotated. The cam surface of the hole 19d engages with the cam pin 18b to separate the pole 18 from the ratchet 13c. Therefore, the operating plate 13 and the first hinge plate 11, that is, the first ring gear 13b and the first hinge plate 11 are in a non-connected state, and the second hinge plate 12 can freely rotate with respect to the first hinge plate 11. Become mobile. Therefore, the seat back C can be swung back and forth all at once, and if the release lever 19 is released after turning the seat back C to a desired position, the release lever 19 is rotated by the action of the tension spring 20. Return to life and ratchet Paul 18.
It meshes with the other one of the teeth of 13c. In addition, when the seat back C is rotated to the maximum, the pole 18 is a ratchet.
It abuts on the toothless portion of 13c.

As described above, in the reclining mechanism A, the inclination angle of the seat back C can be adjusted steplessly by operating the handle 14a and stepwise to a desired position by operating the release lever 19, and the seat back can be adjusted at once. The load applied from C to the second hinge plate 12 is collar 21.
It is received by the first hinge plate 11 via a and 21b, and does not act on the operation shaft 14 penetrating both collars 21a and 21b. Therefore, the operation of the handle 14a is light without being affected by the load, and the operation shaft 14 is not required to have high strength, and the operation shaft 14 can be made thin and lightweight.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a reclining mechanism according to an embodiment of the present invention taken along line II-II in FIG. 2, FIG. 2 is a side view of the mechanism, and FIG. 3 is an exploded perspective view of the mechanism. , 4th
The figure is a side view of a seat provided with the same mechanism. 11 …… First hinge plate, 12 …… Second hinge plate, 12b …… Second ring gear, 13 …… Operating plate, 13b
...... 1st ring gear, 13c ...... Ratchet, 14 ...... Operating shaft, 15 ...... Sun gear, 16a to 16c ...... Planetary gear, 17
a, 17b ... Support plate, 18 ... Pole, 19 ... Release lever, 20 ... Tension spring, 21a, 21b ...
Color.

Claims (2)

[Scope of utility model registration request] 1. A first ring gear integrally rotatably provided on a hinge plate fixed to a seat cushion side constituting a seat, and a first ring gear integrally rotatably provided on a hinge plate fixed to a seat back side. A second ring gear having a number of teeth different from the number of teeth of one ring gear and positioned in parallel with the same ring gear, and integrally rotatable on an operation shaft that rotatably penetrates through the central portions of these two ring gears. A sun gear that is provided in the center of both ring gears, a planetary gear that is located between the sun gear and the two ring gears and meshes with these three gears, and a planetary gear that is rotatably provided on the operation shaft. A reclining mechanism for a seat having a support plate that rotatably supports, wherein the operating shaft is fitted in the through holes of the both ring gears. Seat reclining mechanism, characterized in that passed through the inside of the collar which is supported on Nji plate. 2. A seat reclining mechanism of the type described in claim 1, wherein one of the two ring gears is formed separately from the hinge plate and a circle having a plurality of teeth on the outer periphery of the ring gear. A reclining mechanism for a seat, characterized in that an arc-shaped ratchet is provided, a pole that releasably meshes with the ratchet is provided on the hinge plate, and a release means that releases the mesh of the pole with respect to the ratchet is provided.