JPH048817Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a stepless seat reclining device used for a vehicle seat.

[Prior Art] As a stepless seat reclining device, a system using a so-called Taumel mechanism is known. In this Taumel mechanism, as shown in FIG. 4, an outer gear A and an internal gear B having different numbers of teeth engage coaxially at an eccentric shaft C, that is, a drive shaft.
This mechanism is such that when the drive shaft C rotates once, a rotational force corresponding to the tooth number ratio is applied to the internal gear B.

Therefore, by connecting the outer gear A of this Taumel mechanism to the seat and the internal gear to the seat back, a stepless seat reclining device can be constructed (Japanese Patent Publication No. 49-48691
(see publication).

Incidentally, recently, reclining devices in which the Taumel mechanism is provided on both sides of the seat cushion and each drive shaft is connected by a torque rod are being adopted. In this device, both sides of the seat bag are supported by a Taumel mechanism to eliminate twisting of the back frame due to cantilever support.

[Problems to be solved by the invention] However, according to the Taumel mechanism described above, the meshing between the outer gear and the internal gear is only a part of both gears, and even if both gears are machined with high precision, the tooth portion Since this clearance requires meshing clearance, a bump occurs due to this clearance, resulting in rattling. As a result, not only the stability of the seat back is impaired, but also the seat back vibrates and generates noise due to resonance during driving.

Therefore, as shown in Japanese Utility Model Publication No. 57-43586, it has been proposed to remove the backlash by providing a biasing means that applies a rotational moment in the opposite direction between both gears, or by using a double outer gear. ing. However, all of these methods involve complicating the mechanism and increasing the number of parts.

This idea solves the above problems,
The purpose is to provide the same effect as a double gear by shifting the phase of the left and right Taumel mechanisms.

[Means for Solving the Problems] In order to achieve the above object, this invention is characterized in that the fixing position of each plate arm with respect to the side retainer is shifted back and forth.

[Example] Hereinafter, an example of this invention will be described in detail using the drawings.

FIG. 1 is an exploded perspective view of the seat reclining device according to this invention, FIG. 2 is a side sectional view of the assembled state, and FIGS. 3a and 3b are enlarged views showing the meshing state of left and right gears.

In the figure, 1 is a base frame, 2 is a plate disk fixed to the inside of the base frame 1 via a spacer pin 3, and an outer gear 4 is protruded from the side surface of the plate disk 2 by half-press molding. ing.

A plate arm 5 is disposed on the side of the plate disk 2, and an internal gear 6 that meshes with the outer gear 4 is formed on the side of the plate arm 5 by half punching.

A drive shaft 7 is inserted through the center of rotation of each gear 4, 6. One end of the drive shaft 7 passes through a shaft hole 1a opened in the base frame 1, and an operating knob 9 is attached to the externally projecting end of the drive shaft 7 via a support disk 8.

The other end of the drive shaft 7 passes through a support disk 10 which is fixed via the spacer pin 3 and is pivotally supported. A cam portion 11 is provided on the outer periphery of the drive shaft 7.
are integrally formed, and by fitting this cam portion 11 to the rotation center of the internal gear 6, both gears 4,
A rotational force corresponding to the ratio of the number of teeth between 6 and 6 is applied to the internal gear 6.

A side retainer bracket 13 is connected to the upper part of the plate arm 5 via a pin 12. This bracket 13 is integrated into both sides of a seat back frame (not shown).
Therefore, the back frame tilts forward and backward due to the rotation of the drive shaft 7 in response to the rotation of the operating knob 9, the corresponding rotation of the internal gear 6, and the rotation of the plate arm 5. .

Note that reference numeral 14 is a guide pin provided protruding from the plate arm 5, and 15 is a guide hole opened in the base frame 1 into which the protruding end of the guide pin 14 is fitted. positioning and regulating the maximum turning angle.

The device configured as described above is provided symmetrically on the left and right sides of the base frame 1.

The right and left drive shafts 7 are located coaxially, and are connected by a torque rod 16.

Thereby, by rotating the operating knob 9, the left and right sides are tilted in the same manner.

This device is assembled to a base frame 1, and then a plate arm 5 is attached to a side retainer bracket 1.
3 to complete the assembly. Here, the fixed ends of both plate arms 5 relative to the side retainer brackets 13 are shifted back and forth.

A stress corresponding to the amount of deviation acts on the seat back frame in which the side retainer bracket 13 is integrated, and a force that urges one plate arm 5 toward the forward movement side and the other plate arm 5 toward the backward movement side is applied. is added. That is, each plate arm 5 is urged to rotate clockwise and counterclockwise about the axis.

As a result, the meshing between the outer gear 4 and the internal gear 6 on one side creates a clearance C ₁ in the counterclockwise direction as shown in FIG. A phase difference is generated in a state where a clearance C ₂ is generated in the clockwise direction.

Therefore, the clearance between each gear 4 and 6
The backlash corresponding to C ₁ and C ₂ is extremely small when combined, and has the same effect as the backlash prevention effect of a double gear.

In addition, in order to shift each plate arm 5 back and forth and fix it, the mounting holes on the plate arm 5 side or the mounting holes on the side retainer bracket 13 side are shifted back and forth on the left and right, or the mounting holes on one side are formed front and back. It is sufficient to make a long hole in the direction and fix it at the backlash correction position (states shown in FIGS. 3a and 3b).

[Effects of the invention] As explained in detail in the embodiments above, according to this invention, in a stepless seat reclining device equipped with a Taumel mechanism on the left and right sides, the invention can be used without increasing the number of parts or complicating the assembly. It is possible to prevent bumps between gears and the rattling caused by this.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of the seat reclining device according to this invention, Figure 2 is a side sectional view of the assembled state, Figures 3a and b are enlarged views showing the meshing state of left and right gears, and Figure 4. is an explanatory diagram showing the operating principle of the Taumel mechanism. 1... Base frame, 2... Plate disk, 4... Outer gear, 5... Plate arm, 6... Internal gear, 7... Drive shaft, 1
3...Side retainer bracket, 16...Torque lock.

Claims (1)

[Scope of utility model registration request] An angle adjustment mechanism consisting of meshing outer gears and internal gears and a drive shaft for operating each angle adjustment mechanism are provided on both sides of the rear of the seat cushion, and a torque rod is arranged to connect each drive shaft on the same axis. In the stepless seat reclining device in which the plate arms integrating the internal gears are fixed to side retainers provided on both sides of the seat back frame, each of the plate arms is fixed to the side retainers. A stepless seat reclining device that is characterized by shifting its position back and forth.