JPH0425000Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a seat reclining device for a vehicle or the like.

Conventionally, in a seat reclining device that adjusts the seat back steplessly, the first gear means is an external gear, and the first gear means is formed to have at least one tooth more than the first gear means and is larger by the tooth height. a second gear means which is an internal toothed wheel meshing with the second gear means;
An eccentric shaft part is fitted into a shaft hole opened at the center of the first gear means, and when rotated, the eccentric shaft part also rotates, moving the meshing position of the first gear means and the second gear means. The adjustment mechanism consists of a rotating shaft that adjusts the angle steplessly by rotating the seat cushion, and by releasing the lock using the operating lever, it is possible to rotate between the seat cushion side hinge means and the seat back side hinge means. A seat reclining device is known that has both a forward folding mechanism that allows passengers to get on and off the vehicle.

However, as described above, the system in which adjustment is performed while the first and second gears are in mesh with each other causes more mechanical wobbling than the system in which the reclining angle is varied by locking off the meshing of the gears. This is due to the fact that in order for this mechanism to operate smoothly, backlash is absolutely necessary between the internal gear and the external gear, and also due to variations in the eccentricity of the eccentric shaft and the This is due to play in the rotational direction due to distortion caused by heat treatment. Further, when the reclining device is subjected to a load to test its operation, excessive force is applied to the meshing portions of the gears, causing wear of the gears, which causes further rattling. Therefore, an object of the present invention is to solve these problems and provide a seat reclining device with less rattling feeling.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

A first hinge means A attached to the seat cushion side (not shown) as shown in FIG.
consists of a base plate 1 and a return plate 2, and the base plate 1 has a transmission mechanism 3 on the side.
a shaft hole 3 having an inner diameter matching the outer diameter of the bush 33 of No. 2, rivet holes 4, 4 for riveting the return plate 2, a spring hole 5 for tensioning the spring means 42, and an operating lever 36. A shaft hole 6 that supports a shaft pin 46 that supports a shaft pin 46, a shaft hole 7 that supports a stopper shaft 47, a stopper portion 8, and bolt holes 9, 9 for attaching the base plate 1 to a seat cushion are provided. ing. The return plate 2 also has rivet holes 10, 10 at its ends for riveting to the base plate 1, and a stopper 13 provided coaxially with the rotating shaft 35 for fastening the return spring 14.
The return plate 2 is attached to the base plate 1 by fixing the rivet holes 4, 4, 10, 10 with rivets 12, 12.

The second hinge means B attached to the seat back side (not shown) consists of an arm 15 and an arm holder 16, and the arm 15 has an internal gear embossed on the lower side by precision press processing or the like. The second gear means 17, a small-diameter shaft hole 18 for supporting one coaxial shaft portion 35c of the rotating shaft 35 opened in the center of the second gear means, and a shaft hole 18 for riveting the arm holder 16. Rivet holes 19, 19 and bolt holes 20, 20 for attachment to the seat bag are provided.
The arm holder 16 also has a small-diameter shaft hole 21 in the center for supporting the other concentric shaft portion 35b of the rotating shaft 35, a bent end portion 22 serving as a stopper, and rivet holes 23, 23. and a hook 24 for mounting the return spring 14 as shown in FIG.
and the rivet holes 23, 2 of the arm holder 16.
3 is fixed with rivets 25, 25.

26 is the base plate 1 and the arm 15;
An intermediate member between the two gears, which has at least one tooth less than the second gear means 17 and is smaller by the tooth height and meshes with the second gear means 17, and is embossed by precision press processing or the like. a first gear means 27 which is a gear; and a first gear means 27;
A large diameter shaft hole 28 opening at the center, a protrusion 29 having a locking shoulder 30, and a stopper 31 are provided.

The transmission mechanism 32 includes the bush 33, the bearing 34, and the rotating shaft 35, and is assembled integrally. The rotating shaft 35 has a concentric shaft portion 35.
b, 35c, an end portion 35d for attaching the rotation knob 48, and an eccentric shaft portion 35a supported by the bearing 34 between the concentric shaft portions 35b, 35c.

Reference numeral 36 denotes an operating lever, which has a shaft hole 37 and a small hole 49, and a notch 38 for tensioning the spring means 42 at its lower end. The latch 39 also has a shaft hole 40 having the same diameter as the shaft hole 37,
A protrusion 50 is provided adjacent to this, and a locking end 41 is formed at the upper end. And operation lever 3
6 and the latch 39 are connected to the shaft hole 37 and the shaft hole 40.
The small holes 49 and the protrusions 50 are fitted into the protrusions 50 so that they are concentric and overlap, and are fixed integrally.

43 is a plate holder and the stopper shaft 4
A shaft hole 44 for supporting the shaft pin 7 and a shaft hole 45 for supporting the shaft pin 46 are provided.

The base plate 1, the intermediate member 26, the arm 15, and the plate holder 43 are assembled in this order from the inside, and the bearing 3 supports the eccentric shaft portion 35a of the rotating shaft 35.
The bush 33 fitted into the shaft hole 2 of the intermediate member
8 and the shaft hole 3 of the base plate 1, one concentric shaft portion 35b of the rotating shaft is rotatably supported by the shaft hole 21 of the arm holder 16,
The other concentric shaft portion 35c is connected to the shaft hole 1 of the arm 15.
8, and a rotation knob 48 is attached to the end portion 35d protruding from the shaft hole 18. The operation lever 36 is connected to the base plate 1.
The latch 39 is rotatably supported by a shaft pin 46 between the base plate 1 and the plate holder 43, and the latch 39 is locked by a spring means 42 stretched between the spring hole 5 of the base plate 1 and the notch 38 of the operating lever 36. The end portion 41 is urged toward the intermediate member 26 side. and,
The return spring 14 has one end fixed to a stopper 13 attached to the return plate 2 coaxially with the rotating shaft 35, and the other end is fixed to the hook 24 of the arm holder 16 so as to bias the arm 1 forward. It is hung.

In the seat reclining device configured as described above, the intermediate member 26 is connected to the stopper shaft 47 in the lock position, and the stopper 3 of the intermediate member 26 is connected to the stopper shaft 47 in the lock position.
1 abut against each other to prevent backward rotation, and the locking shoulder 30 of the intermediate member 26 contacts the locking end 41 of the latch 39.
The forward rotation is prevented by the locking, and the locking position is fixed at the locked position.

Then, when the rotation knob 48 is turned in the locked position, the rotation of the rotation shaft 35 causes the first gear means 27 of the intermediate member 26 into which the eccentric shaft portion 35a is inserted to be rotated by one tooth from the second gear means 17 of the arm 15. Since there is little engagement, the position of this engagement part has to be moved little by little, and the base plate 1 and arm 15
The angle of the recline can be adjusted steplessly, allowing the occupant to adjust the recline angle to the desired angle.

When the operating lever 36 is rotated counterclockwise in the first figure to unlock the locking end 41 and the locking shoulder 30, the arm 15 is moved to the forward position by the biasing force of the return spring 14. The seatbacks are folded forward, allowing passengers to get in and out of the rear seats. At this time, the intermediate member 26 and the arm 15 rotate together with the first gear means of the intermediate member 26 and the second gear means 17 of the arm 15 meshing with each other. In this forward-folding position, the stopper portion 8 of the base plate 1 and the bent end portion 22 of the arm holder 16 come into contact with each other, thereby regulating the forward-folding angle.

Then, attach the seat back to the return spring 1
When the stopper shaft 47 and the stopper 31 come into contact with each other again, the latch 39, which is urged by the spring means 42, engages with the locking shoulder 30 and is in the locked position. to return to.

Thus, the present invention includes a rotating shaft, a first hinge means fixed to the seat cushion, a latch pivotally supported on the first hinge means by an axle pin and having a locking end at one end; a stopper shaft supported by the first hinge means; a stopper shaft rotatably supported by the rotary shaft with respect to the first hinge means; a stopper shaft having a first gear means; By having an intermediate member having a stopper that comes into contact with the stop shoulder and the stopper shaft, and a second hinge means that is fixed to the seat bag and has a second gear means that meshes with the first gear means of the intermediate member, The meshing of the first gear means of the intermediate member and the second gear means of the second hinge means steplessly adjusts the angle of the seat back and unlocks the locking end portion and the locking shoulder portion. The first gear means of the intermediate member and the second gear means
The seat reclining device moves the seat bag to a forward folding position while the second gear means of the hinge means is in mesh with the second gear means, wherein the first hinge means includes a base plate and a return plate, and the second hinge means includes an arm. and an arm holder, and a return spring is installed between a stop provided on the return plate coaxially with the rotation axis and a hook provided on the arm holder to urge the arm forward. Since this is a seat reclining device, the meshing portion of the first gear means and the second gear means is always urged forward, so the return spring works to tilt the seat back forward, which is the original function, and also prevents the vehicle from vibrating. The seat back is always spring-biased forward, so there is no rattling and the operation is smooth. Furthermore, when the seat back is folded forward, the first gear means of the intermediate member and the second gear means of the second hinge means are kept in the meshed state, and the intermediate member and the second hinge means are integrally moved to the forward folded position. If you want to return the seat back to its original position after tilting it forward, you can rotate the seat back backwards against the biasing force of the return spring and the stopper shaft will come into contact with the stopper again. Since the gear means and the second gear means return to the locked position while remaining in mesh with each other, there is no need to adjust the seat back position again, and the seat back angle can be easily set to the position before it was tilted forward, which reduces the hassle of operability. There is no. In addition, when adjusting the seat back forward, the occupant's upper body must be raised; however, this force is balanced by the biasing force of the return spring, and excessive force is not applied to the gears. This produces the effect of reducing wear and improving durability. The return spring is installed between the stopper attached to the return plate coaxially with the rotating shaft and the hook of the arm holder, making it possible to install it near the center of the axis, allowing the return spring to be made smaller. Since it does not protrude from the outer periphery of the base plate or the arm, the appearance is improved.

[Brief explanation of the drawing]

FIG. 1 is a side view of the present invention, FIG. 2 is a sectional view taken along the - arrow in FIG. 1, and FIG. 3 is an exploded perspective view. A...first hinge means, B...second hinge means, 1...base plate, 2...return plate, 13...stopper, 14...return spring, 15...arm, 16...arm holder, 17...Second gear means, 24...Hook, 2
6... Intermediate member, 27... First gear means, 31...
... Stopper, 32 ... Transmission mechanism, 35 ... Rotating shaft, 36 ... Operation lever, 39 ... Latch, 47
...stopper axis.

Claims (1)

[Scope of utility model registration request] a rotating shaft and a first fixed to the seat cushion;
a latch that is pivotally supported by the first hinge means by a shaft pin and has a locking end at one end; and a stopper shaft supported by the first hinge means;
The first gear means is rotatably supported by the rotating shaft with respect to the first hinge means, and has a locking shoulder that locks on the locking end of the latch and a stopper that abuts the stopper shaft. By having an intermediate member and a second hinge means fixed to the seat bag and having a second gear means meshing with the first gear means of the intermediate member, the first gear means of the intermediate member and the second hinge By meshing with the second gear means of the intermediate member, the angle of the seat back is adjusted steplessly and the locking end portion and the locking shoulder portion are unlocked. The seat reclining device moves the seat bag to a forward folding position while the second gear means of the two-hinge means is in mesh with the second gear means, the first hinge means comprising a base plate and a return plate, and the second hinge means comprises a base plate and a return plate. The arm is composed of an arm and an arm holder, and a return spring is installed between a stop provided on the return plate coaxially with the rotation axis and a hook provided on the arm holder to urge the arm forward. Features a seat reclining device.